CN216666061U

CN216666061U - Prevent solution cavity card borer hydraulic system and drill jumbo

Info

Publication number: CN216666061U
Application number: CN202220104756.0U
Authority: CN
Inventors: 龚俊; 宋祖源; 伍锡文; 高洋
Original assignee: Hunan Wuxin Tunnel Intelligent Equipment Co Ltd
Current assignee: Hunan Wuxin Tunnel Intelligent Equipment Co Ltd
Priority date: 2022-01-14
Filing date: 2022-01-14
Publication date: 2022-06-03
Anticipated expiration: 2032-01-14

Abstract

The utility model provides a hydraulic system for preventing a drill rod from being stuck in a karst cave and a drill jumbo, and relates to the field of engineering machinery. The karst cave blockage prevention hydraulic system comprises a first control oil source, a drilling oil cylinder, an oil tank, a first hydraulic control reversing valve and a second control oil source; the first control oil source is connected with the drilling oil cylinder through a hydraulic control throttle valve, a pilot control cavity of the hydraulic control throttle valve is connected with a pressure oil source, and the pressure oil source is also connected with an oil tank through a hydraulic control valve; pilot control cavities at two ends of the first hydraulic control reversing valve are respectively communicated to two ends of the hydraulic control throttling valve; and the second control oil source is connected with the pilot control cavity of the pilot control valve through the first pilot control reversing valve. When a karst cave is suddenly encountered in the drilling process, the karst cave blocking prevention hydraulic system can automatically reduce the drilling speed to the minimum value, so that the drill bit is prevented from impacting on a rock stratum at an excessively high speed, and the drill bit blocking condition caused by the deflection of the drill bit is avoided. The hydraulic automatic control is realized without the help of electric control means such as a sensor and the like, and the cost is effectively controlled while the drill rod is prevented from being stuck in the karst cave.

Description

Prevent solution cavity card borer hydraulic system and drill jumbo

Technical Field

The utility model relates to the field of engineering machinery, in particular to a hydraulic system for preventing a drill rod from being stuck in a karst cave and a drill jumbo.

Background

The drill jumbo is widely applied to mechanical construction of tunnels and mines and is used for drilling operation before blasting. The construction environment of the tunnel and the mine is complex, broken stones, cracks, mud residues and karst caves exist in rock stratums, the hardness of the rock stratums is different, and drill rod clamping accidents including crack drill rod clamping, gradual change drill rod clamping, karst cave drill rod clamping and the like easily occur during drilling of the drill jumbo.

The karst cave drill rod clamping means that the drill jumbo suddenly meets the karst cave in the drilling process, and the drilling oil cylinder is quickly pushed. When the drilling oil cylinder props against the rock stratum again, the drill bit is easy to deflect to cause drill rod clamping due to the fact that the drilling oil cylinder is high in speed. A large amount of time is wasted after the drill rod is clamped to enable the drilling machine to be trapped, so that the construction progress is influenced, the drilling tool is damaged or even scrapped, and the use cost of the drill jumbo is increased.

The existing fully-hydraulic control rock drilling trolley does not have the function of preventing a drill rod from being stuck in a karst cave, and has the defects. Although the existing drill jumbo controlled by a full computer can prevent drill rod from being stuck in a karst cave, the machine purchasing and using cost and the maintenance cost are high, and the popularization rate is far lower than that of the drill jumbo controlled by the full computer.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model aims to provide an anti-cave drill rod clamping hydraulic system.

The utility model provides the following technical scheme:

a hydraulic system for preventing a karst cave from clamping a drill rod comprises a first control oil source, a drilling oil cylinder, an oil tank, a first hydraulic control reversing valve and a second control oil source;

the first control oil source is connected with the drilling oil cylinder through a hydraulic control throttling valve, a pilot control cavity of the hydraulic control throttling valve is connected with a pressure oil source, and the pressure oil source is also connected with the oil tank through a hydraulic control valve;

a pilot control cavity at one end of the first hydraulic control reversing valve is communicated between the first control oil source and the hydraulic control throttling valve, and a pilot control cavity at the other end of the first hydraulic control reversing valve is communicated between the hydraulic control throttling valve and the drilling oil cylinder;

and the second control oil source is connected with the pilot control cavity of the hydraulic control valve through the first hydraulic control reversing valve so that the hydraulic control valve is opened when the first hydraulic control reversing valve reverses.

As a further optional scheme of the karst cave blocking prevention drill rod hydraulic system, the hydraulic control valve adopts a hydraulic control one-way valve, and an oil inlet of the hydraulic control one-way valve is connected with the oil tank.

As a further optional scheme for the anti-cave drill rod clamping hydraulic system, the system further comprises a manual reversing valve, a second hydraulic control reversing valve, a third control oil source and an impact control loop;

the second control oil source is connected with a pilot control cavity of the manual reversing valve through the first hydraulic control reversing valve so that the manual reversing valve is reset when the first hydraulic control reversing valve reverses;

the second control oil source is connected with a pilot control cavity of the second hydraulic control reversing valve through the manual reversing valve so that the second hydraulic control reversing valve reverses when the manual reversing valve reverses;

the third control oil source is communicated with the impact control loop through a high impact pressure control valve when the second hydraulic control reversing valve is reversed so as to provide high impact pressure signal oil, and the third control oil source is communicated with the impact control loop through a low impact pressure control valve when the second hydraulic control reversing valve is reset so as to provide low impact pressure signal oil.

As a further optional scheme of the anti-cave drill rod clamping hydraulic system, a pilot control cavity of the hydraulic control throttle valve is communicated between the high impact pressure control valve and the second hydraulic control reversing valve, and the pressure oil source is the high impact pressure signal oil.

As a further alternative to the solution cavity blockage prevention hydraulic system, a pilot-operated reducing valve is arranged between the first control oil source and the hydraulic control throttle valve.

As a further optional scheme of the karst cave blockage prevention hydraulic system, the karst cave blockage prevention hydraulic system further comprises a manual reversing valve, a third hydraulic control reversing valve, a high propelling pressure control valve and a low propelling pressure control valve;

the second control oil source is connected with a pilot control cavity of the third hydraulic control reversing valve through the manual reversing valve so that the third hydraulic control reversing valve reverses when the manual reversing valve reverses;

the high-thrust pressure control valve is communicated with a pilot control cavity of the pilot type pressure reducing valve when the third hydraulic control reversing valve reverses, and the low-thrust pressure control valve is communicated with the pilot control cavity of the pilot type pressure reducing valve when the third hydraulic control reversing valve resets.

As a further optional scheme of the anti-cave drill rod clamping hydraulic system, a pressure compensator is arranged between the first control oil source and the hydraulic control throttling valve;

and a pilot control cavity at one end of the first hydraulic control reversing valve is communicated between the first control oil source and the pressure compensator.

As a further optional scheme of the anti-karst-cave drill rod clamping hydraulic system, the system further comprises a fourth control oil source, the fourth control oil source is communicated to the rod cavity of the drilling oil cylinder, and the first control oil source is communicated to the rodless cavity of the drilling oil cylinder.

As a further optional scheme of the karst cave blockage prevention hydraulic system, a bypass circuit is arranged between the first control oil source and the drilling oil cylinder, and a one-way valve is arranged on the bypass circuit, so that hydraulic oil in the drilling oil cylinder can flow back to the first control oil source through the bypass circuit.

It is another object of the present invention to provide a rock-drilling rig.

The utility model provides the following technical scheme:

a rock drilling jumbo comprises the anti-karst cave drill rod clamping hydraulic system.

The embodiment of the utility model has the following beneficial effects:

in the normal drilling process of the drilling machine, the hydraulic control valve is in a closed state, the pressure of the pressure oil source directly acts on the hydraulic control throttle valve, the hydraulic control throttle valve is reversed, the throttle opening is opened to the maximum, and the drilling speed reaches the maximum. When the drilling process encounters the karst cave suddenly, the pressure in the drilling oil cylinder is quickly reduced, and the pressure difference between the front and the rear of the hydraulic control throttle valve is larger than the reversing pressure set by the first hydraulic control reversing valve, so that the first hydraulic control reversing valve is reversed. At this time, the pilot signal oil in the second control oil source flows into the pilot control cavity of the pilot control valve through the first pilot control reversing valve, so that the pilot control valve is opened, and the pressure oil source is communicated with the oil tank. The pressure of the pressure oil source is discharged into the oil tank, the hydraulic control throttle valve is not influenced, the hydraulic control throttle valve is reset quickly, the throttle opening is closed to the minimum, the drilling speed is reduced to the minimum, the drill bit is prevented from impacting on a rock stratum at an excessively high speed, and the drill bit clamping condition caused by the deflection of the drill bit is avoided. The hydraulic system for preventing the drill rod from being stuck in the karst cave realizes hydraulic automatic control without using electric control means such as a sensor and the like, and effectively controls the cost while preventing the drill rod from being stuck in the karst cave.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible and comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram illustrating an overall structure of a hydraulic system for preventing a cave from being stuck in a drill rod, according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram illustrating a propulsion speed control oil path in a hydraulic system for preventing cave jamming according to an embodiment of the present invention;

FIG. 3 shows a schematic structural diagram of an impact pressure control oil path in a hydraulic system for preventing a cave from being stuck in a drill rod according to an embodiment of the utility model;

fig. 4 shows a schematic structural diagram of a thrust pressure control oil path in a hydraulic system for preventing a cave from being stuck.

Description of the main element symbols:

1-a first control oil source; 2-a second control oil source; 3-a third control oil source; 4-a fourth control oil source; 5-drilling oil cylinder; 6-an oil tank; 7-a one-way valve; 8-a pilot operated pressure reducing valve; 9-a pressure compensator; 10-hydraulic control throttle valve; 11-a first pilot operated directional control valve; 12-a hydraulic control valve; 13-a manual directional valve; 14-a second hydraulically controlled directional control valve; 15-high impact pressure control valve; 16-a low impact pressure control valve; 17-a third pilot operated directional control valve; 18-high boost pressure control valve; 19-low boost pressure control valve.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Examples

Referring to fig. 1, the present embodiment provides a hydraulic system (hereinafter, referred to as "hydraulic system") for preventing drill rod from being stuck in a karst cave, which is applied to a drill jumbo. The hydraulic system comprises a main oil path, a propulsion speed control oil path, an impact pressure control oil path, a propulsion pressure control oil path, a first control oil source 1, a second control oil source 2, a third control oil source 3, a fourth control oil source 4, a drilling oil cylinder 5 and an oil tank 6.

In order to simplify the structure, some elements are shared among the propulsion speed control oil passage, the propulsion pressure control oil passage, and the impact pressure control oil passage. In the figure, the solid line indicates a line through which the hydraulic oil flows, and the broken line indicates a line through which the signal oil flows.

Specifically, a piston rod of the drilling oil cylinder 5 is connected with the drilling machine to drive the drilling machine to advance. The drilling machine has two working modes, namely a low-thrust low-speed tapping mode and a high-thrust high-speed normal drilling mode.

When drilling, the first control oil source 1 is communicated with the rodless cavity of the drilling oil cylinder 5 through the main oil way, hydraulic oil in the first control oil source is continuously injected into the rodless cavity of the drilling oil cylinder 5 to push the piston of the drilling oil cylinder 5 to move right, so that the piston rod of the drilling oil cylinder 5 extends out, and finally the drilling machine is driven to advance forwards.

Furthermore, the fourth control oil source 4 is communicated with a rod cavity of the drilling oil cylinder 5, a bypass loop is further arranged between the first control oil source 1 and a rodless cavity of the drilling oil cylinder 5, and a check valve 7 is arranged on the bypass loop.

When the drilling oil cylinder 5 drills, the hydraulic oil in the first control oil source 1 enters a rodless cavity of the drilling oil cylinder 5, and the hydraulic oil in a rod cavity of the drilling oil cylinder 5 enters the fourth control oil source 4. When the drilling oil cylinder 5 retracts, hydraulic oil in the fourth control oil source 4 enters a rod cavity of the drilling oil cylinder 5, and hydraulic oil in a rodless cavity of the drilling oil cylinder 5 flows back to the first control oil source 1 from the bypass loop through the one-way valve 7.

Specifically, the main oil path comprises a pilot type pressure reducing valve 8, a pressure compensator 9 and a hydraulic control throttle valve 10 which are connected in sequence, an oil inlet of the pilot type pressure reducing valve 8 is communicated with the first control oil source 1, and an oil outlet of the hydraulic control throttle valve 10 is communicated with a rodless cavity of the drilling oil cylinder 5.

The pilot type pressure reducing valve 8 is controlled by the propulsion pressure control oil circuit to adjust the oil pressure of the hydraulic oil from the first control oil source 1, and the pressure output by the drilling oil cylinder 5 is ensured to meet the drilling requirement.

The pressure compensator 9 performs pressure compensation on the inlet and outlet of the hydraulic control throttle valve 10, so that speed requirements in two drilling states are met, and the pressure compensator 9 can ensure that the pressure reduction pressure after the pilot type reducing valve 8 is low pushing pressure or high pushing pressure.

The hydraulic control throttle valve 10 is controlled by the propelling speed control oil circuit to change the self-throttling opening, thereby changing the extending speed of the piston rod of the drilling oil cylinder 5 and further changing the drilling speed of the drilling machine. The larger the throttle opening of the pilot-operated throttle valve 10, the larger the drilling speed.

Referring to fig. 2, specifically, the propulsion speed control oil line is composed of a first pilot operated directional control valve 11, a pressure oil source, and a pilot operated valve 12. The second pilot oil source 2 is connected to a pilot control chamber of a pilot valve 12 via a first pilot-operated directional control valve 11, and serves as a pilot signal oil source for a propulsion speed control oil path.

A pilot control cavity at one end of a first hydraulic control reversing valve 11 is communicated between a pilot type reducing valve 8 and a pressure compensator 9, and a pilot control cavity at the other end of the first reversing valve is communicated between a hydraulic control throttling valve 10 and a drilling oil cylinder 5, so that differential pressure control reversing can be realized.

When the pressure difference between the pilot control chambers at the two ends of the first pilot-controlled directional control valve 11 reaches the set directional control pressure, the first pilot-controlled directional control valve 11 reverses, so that the pilot signal oil in the second control oil source 2 flows into the pilot-controlled valve 12 through the first pilot-controlled directional control valve 11, and the pilot-controlled valve 12 is opened.

The pressure oil source is a high-pressure signal oil source, and is connected with the pilot control cavity of the hydraulic control throttle valve 10 and the oil tank 6 through the hydraulic control valve 12.

In the normal drilling process of the drilling machine, the hydraulic control valve 12 is in a closed state, the pressure of the pressure oil source directly acts on the hydraulic control throttle valve 10, the hydraulic control throttle valve 10 is enabled to be reversed, the throttle opening is opened to the maximum, and the drilling speed reaches the maximum. When the karst cave is suddenly encountered in the drilling process, the pressure in the drilling oil cylinder 5 is rapidly reduced, and the pressure difference of the pilot control cavities at the two ends of the first hydraulic control reversing valve 11 is greater than the reversing pressure set by the first hydraulic control reversing valve 11, so that the first hydraulic control reversing valve 11 is reversed. At this time, the pilot signal oil in the second control oil source 2 flows into the pilot control cavity of the pilot control valve 12 through the first pilot-controlled directional control valve 11, so that the pilot control valve 12 is opened, the pilot control cavity of the pilot-controlled throttle valve 10 is communicated with the oil tank 6, the pilot signal oil of the pilot-controlled throttle valve 10 flows into the oil tank 6, the pilot-controlled throttle valve 10 is quickly reset to the initial position, the throttle opening is closed to the minimum, the drilling speed is reduced to the minimum, the drill bit is prevented from impacting on a rock stratum at an excessively high speed, and the drill bit is prevented from being clamped due to deflection.

In this embodiment, the pilot-controlled valve 12 is a pilot-controlled check valve, and an oil inlet of the pilot-controlled check valve is connected to the oil tank 6, so as to ensure that the pilot-controlled valve 12 is always kept in a closed state when a pilot control cavity of the pilot-controlled valve 12 is not communicated with the second control oil source 2, so as to ensure that the pressure of the high-pressure signal oil source can stably act on the pilot-controlled throttle valve 10, and then the pilot-controlled throttle valve 10 is always kept at the maximum opening.

In another embodiment of the present application, the pilot operated valve 12 may also employ other pilot operated type directional control elements.

Referring to fig. 3, specifically, the impact pressure control oil line is composed of a first pilot-operated directional control valve 11, a manual directional control valve 13, a second pilot-operated directional control valve 14, a high impact pressure control valve 15, a low impact pressure control valve 16, and an impact control circuit (not shown).

The third control oil source 3 is connected to the high impact pressure control valve 15 and the low impact pressure control valve 16 through the second pilot-operated directional control valve 14, and is further connected to the impact control circuit through one of the high impact pressure control valve 15 and the low impact pressure control valve 16 as a signal oil source of the impact control circuit.

The second control oil source 2 is connected with the pilot signal cavity of the second hydraulic control directional control valve 14 through the manual directional control valve 13 to serve as a pilot signal oil source of the second hydraulic control directional control valve 14, and is connected with the pilot signal cavity of the manual directional control valve 13 through the first hydraulic control directional control valve 11 to serve as a pilot signal oil source of the manual directional control valve 13.

The manual directional control valve 13 is a two-position three-way directional control valve, and is configured to perform directional control by hand and to be reset by pilot signal oil from the second control oil source 2.

The second hydraulic control directional valve 14 is a two-position, four-way directional valve that, in an initial position, communicates the third control oil source 3 with the low impulse pressure control valve 16. When pilot signal oil enters a pilot signal cavity of the second hydraulic control reversing valve 14, the second hydraulic control reversing valve 14 reverses to communicate the third control oil source 3 with the high impact pressure control valve 15.

When the manual directional valve 13 is at the initial position, the second control oil source 2 is not communicated with the pilot signal cavity of the second hydraulic directional valve 14, and the pilot signal oil of the second hydraulic directional valve 14 is in a pressure relief state. At this time, the third control oil source 3 is connected to the percussion control circuit through the low percussion pressure control valve 16, and the low percussion pressure signal oil is supplied to the percussion control circuit, and the drilling machine is in the low percussion pressure mode.

When an operator actively switches the manual reversing valve 13 to another station to reverse the manual reversing valve 13, pilot signal oil in the second control oil source 2 enters a pilot signal cavity of the second hydraulic control reversing valve 14 to reverse the second hydraulic control reversing valve 14. At this time, the third control oil source 3 is connected to the percussion control circuit through the high percussion pressure control valve 15, and the high percussion pressure signal oil is supplied to the percussion control circuit, and the drilling machine is in the high percussion pressure mode.

When a karst cave is suddenly encountered in the drilling process, the first hydraulic control reversing valve 11 reverses, so that pilot signal oil in the second control oil source 2 flows into a pilot control cavity of the manual reversing valve 13 through the first hydraulic control reversing valve 11, the manual reversing valve 13 is reset, and the drilling machine returns to a low impact pressure mode.

In the present embodiment, the high and low percussion

pressure control valves

15 and 16 are relief valves.

Further, the pilot control cavity of the pilot-controlled throttle valve 10 and the pilot-controlled valve 12 are both communicated between the high impact pressure control valve 15 and the second hydraulic directional control valve 14, and the high impact pressure signal oil is used as a pressure oil source, so that no additional pressure oil source is required, and the structure of the whole hydraulic system is simplified.

Referring to fig. 4, specifically, the propulsion pressure control oil line is composed of a first pilot operated directional control valve 11, a manual directional control valve 13, a third pilot operated directional control valve 17, a high propulsion pressure control valve 18, and a low propulsion pressure control valve 19.

The second control oil source 2 is connected with the pilot signal cavity of the third pilot-controlled directional control valve 17 through the manual directional control valve 13, and serves as a pilot signal oil source of the third pilot-controlled directional control valve 17.

The third hydraulic control directional valve 17 is a two-position four-way directional valve which, in an initial position, communicates the pilot control chamber of the pilot type pressure reducing valve 8 with the low boost pressure control valve 19. When the pilot signal oil enters the pilot signal chamber of the third pilot-operated directional control valve 17, the third pilot-operated directional control valve 17 is shifted to communicate the pilot control chamber of the pilot-operated pressure reducing valve 8 with the high boost pressure control valve 18.

When the manual directional control valve 13 is at the initial position, the second control oil source 2 is not communicated with the pilot signal cavity of the third pilot-controlled directional control valve 17, and the pilot signal oil of the third pilot-controlled directional control valve 17 is in a pressure relief state. At this time, the low thrust pressure control valve 19 is communicated to the pilot control chamber of the pilot type pressure reducing valve 8, so that the pressure of the hydraulic oil of the first control oil source 1 after being reduced by the pilot type pressure reducing valve 8 is a low thrust pressure, and the drilling machine is in a low thrust pressure mode.

When an operator actively switches the manual reversing valve 13 to another station to reverse the manual reversing valve 13, the pilot signal oil in the second control oil source 2 enters the pilot signal cavity of the third hydraulic control reversing valve 17 to reverse the third hydraulic control reversing valve 17. At this time, the high-thrust-pressure control valve 18 is communicated to the pilot control cavity of the pilot type pressure reducing valve 8, so that the pressure of the hydraulic oil of the first control oil source 1 after being reduced by the pilot type pressure reducing valve 8 is high-thrust pressure, and the drilling machine is in a high-thrust-pressure mode.

When a karst cave is suddenly encountered in the drilling process, the first hydraulic control reversing valve 11 reverses, so that pilot signal oil in the second control oil source 2 flows into a pilot control cavity of the manual reversing valve 13 through the first hydraulic control reversing valve 11, the manual reversing valve 13 is reset, and the drilling machine returns to a low propelling pressure mode.

In the present embodiment, the high boost pressure control valve 18 and the low boost pressure control valve 19 are both relief valves.

In conclusion, the working process of the hydraulic system is as follows:

when the drilling machine advances in an idle pushing mode, the hydraulic control throttle valve 10, the manual reversing valve 13, the second hydraulic control reversing valve 14 and the third hydraulic control reversing valve 17 are all located at initial positions, the pressure of hydraulic oil in the first control oil source 1 after being reduced by the pilot type reducing valve 8 is low pushing pressure, and the drilling machine is located in a low pushing pressure state. When the drill bit is not tightly attached to the rock stratum, the pressure in the rodless cavity of the drilling oil cylinder 5 is small, and a sufficient pressure difference exists between the pilot control cavities at the two ends of the first hydraulic control reversing valve 11, so that the first hydraulic control reversing valve 11 is reversed, the hydraulic control valve 12 is opened, and the hydraulic control throttle valve 10 is kept at the initial position. Due to the throttling effect of the pilot-controlled throttle valve 10 and the pressure compensation of the pilot-controlled throttle valve 10 by the pressure compensator 9, a constant minimum propulsion speed of the drilling machine is obtained.

When the drilling machine continues to advance and is close to a rock stratum, the pressure in the rodless cavity of the drilling oil cylinder 5 rises, the differential pressure between the pilot control cavities at the two ends of the first pilot control reversing valve 11 is not enough to reverse the pilot control reversing valves, so the pilot control valve 12 is closed, but a pressure oil source is not generated temporarily, and the pilot control throttle valve 10 is still kept at the initial position. The pressure of a rodless cavity of the drilling oil cylinder 5 is gradually increased to a low propelling pressure set value, the oil of the third control oil source 3 enters the low impact pressure control valve 16 through the second hydraulic control reversing valve 14 by an external operating system, and the drilling machine enters a low propelling, low impacting and low speed hole opening mode, so that a good hole opening effect can be obtained.

After the hole is opened, an operator pushes the manual reversing valve 13 to reverse, the second control oil source 2 serves as a signal oil source to reverse the second hydraulic control reversing valve 14 and the third hydraulic control reversing valve 17, a pressure oil source is generated, and the drilling machine is switched to a high impact pressure state and a high propelling pressure state. Meanwhile, the high impact pressure signal oil drive reverses the hydraulic control throttle valve 10, the hydraulic control throttle valve 10 reaches the maximum throttle opening, the propelling speed of the drilling machine reaches the maximum, and the drilling machine enters a normal drilling mode of high thrust, high impact and high speed.

When a karst cave is suddenly encountered in the drilling process, the pressure in the rodless cavity of the drilling oil cylinder 5 is rapidly reduced, but the pressure behind the pilot type pressure reducing valve 8 is still high propelling pressure, and the pressure difference of the pilot control cavities at the two ends of the first hydraulic control reversing valve 11 is larger than the reversing pressure set by the first hydraulic control reversing valve 11 again, so that the first hydraulic control reversing valve 11 is reversed. Under the action of pilot signal oil in the second control oil source 2, on one hand, the hydraulic control valve 12 is opened in a quick response manner, so that the hydraulic control throttle valve 10 is quickly reset and in a throttling state in a very short time, and further the drilling speed of the drilling machine is reduced to the minimum value; on the other hand, the manual direction valve 13 is reset, and the second pilot-operated direction valve 14 and the third pilot-operated direction valve 17 are reset. At the moment, the drilling machine enters a hole opening mode with low propelling pressure, low impact pressure and low propelling speed, the states of all hydraulic elements in a hydraulic system are consistent with the idle propelling state of the drilling machine before hole opening, and the drilling machine enters the hole opening mode again.

When the drilling machine drills the open hole again in the karst cave area successfully, an operator can push the manual reversing valve 13 to reverse, so that the drilling machine enters a normal drilling mode again.

In a word, the hydraulic system can effectively realize the function of automatically preventing the drill rod from being stuck in the karst cave, improve the response speed of the drill rod from being stuck in the karst cave and reduce the probability of the drill rod being stuck in the karst cave. The hydraulic system realizes hydraulic automatic control without the help of electric control means such as a sensor and the like, and effectively controls the cost while preventing the drill rod in the karst cave from being blocked. When the drilling machine advances by air pushing or encounters a karst cave suddenly, the hydraulic system can automatically reduce the output power of the rock drilling machine, realize impact power control, effectively protect the rock drilling machine and a drilling tool and prolong the service life of the rock drilling machine. Meanwhile, the control circuit of the hydraulic system can enable the manual reversing valve 13 to be always in the initial position, the manual operation cannot enable the manual reversing valve 13 to be reversed, or the reversing is difficult, and enable the hydraulic control valve 12 to be opened all the time, so that the drilling machine cannot enter a high-impact high-thrust high-speed state, and the drill rod clamping fault caused by manual intervention operation is avoided.

The embodiment also provides a drill jumbo, including above-mentioned karst cave card borer hydraulic system.

In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims

1. The hydraulic system is characterized by comprising a first control oil source, a drilling oil cylinder, an oil tank, a first hydraulic control reversing valve and a second control oil source;

2. The hydraulic system for preventing the drill rod from being stuck in the karst cave according to claim 1, wherein a hydraulic control check valve is adopted as the hydraulic control valve, and an oil inlet of the hydraulic control check valve is connected with the oil tank.

3. The anti-cave jamming hydraulic system according to claim 1, further comprising a manual directional control valve, a second hydraulic directional control valve, a third control oil source and an impact control loop;

and the third control oil source is communicated with the impact control loop through a high impact pressure control valve when the second hydraulic control reversing valve is reversed so as to provide high impact pressure signal oil, and is communicated with the impact control loop through a low impact pressure control valve when the second hydraulic control reversing valve is reset so as to provide low impact pressure signal oil.

4. The anti-cave clamping hydraulic system according to claim 3, wherein a pilot control cavity of the hydraulic control throttle valve is communicated between the high-impact pressure control valve and the second hydraulic control reversing valve, and the pressure oil source is the high-impact pressure signal oil.

5. The anti-cave clamping hydraulic system according to claim 1, wherein a pilot-operated pressure reducing valve is provided between the first pilot oil source and the pilot-operated throttle valve.

6. The anti-cave jamming hydraulic system according to claim 5, further comprising a manual directional control valve, a third hydraulic directional control valve, a high thrust pressure control valve, and a low thrust pressure control valve;

7. The anti-cave clamping hydraulic system according to claim 1, wherein a pressure compensator is arranged between the first control oil source and the hydraulic control throttle valve;

8. The anti-cave stuck drill hydraulic system of claim 1, further comprising a fourth control oil source, the fourth control oil source being communicated to the rod cavity of the drilling cylinder, the first control oil source being communicated to the rodless cavity of the drilling cylinder.

9. The anti-cave clamping hydraulic system according to claim 8, wherein a bypass circuit is arranged between the first control oil source and the drilling cylinder, and a check valve is arranged on the bypass circuit, so that hydraulic oil in the drilling cylinder can flow back to the first control oil source through the bypass circuit.

10. A rock drilling rig comprising an anti-cave drill rod hydraulic system as claimed in any one of claims 1 to 9.