CN109235203B - Paver screed electric heating system, paver and paver screed leakage detection method - Google Patents

Abstract

The invention discloses a paver screed electric heating system, a paver and a paver screed leakage detection method, comprising a power generation device, a main heating switch, a leakage protection device, a heating control device, a plurality of electric heating units and The leakage detection and control device; the leakage protection device detects the leakage of the electric heating system of the paver screed and sends a leakage signal to the leakage detection and control device. The detection signal of the protection device detects whether each electric heating unit has a leakage fault. In the present invention, when a leakage fault occurs, the leakage section can be automatically detected safely, quickly and effectively.

Description

Electric heating system of paver screed, leakage detection of paver and paver screed method

technical field

The invention specifically relates to an electric heating system for a paver screed, a paver and a method for detecting leakage of the paver screed.

Background technique

The screed is a very important working device on the paver, used to compact, smooth and shape the road surface. A screed usually includes a plurality of sub-section screeds that are combined together by hydraulic expansion or mechanical assembly. When paving asphalt, it is usually necessary to preheat the screed to prevent the hot asphalt from adhering to the cold underside of the screed and affecting the pavement quality. Commonly used screed heating methods include oil heating, gas heating, electric heating, etc. Thanks to its advantages of safety and environmental protection, electric heating method is more and more used in paver screeds.

Paver screed electric heating systems typically include generators, electric heating elements, controls, and the like. In order to ensure that the temperature of each sub-section screed is consistent and to save energy, the existing heating system has implemented independent heating control for the heating elements of each sub-section screed. Electric heating systems often need to be equipped with leakage protection devices such as Ground Fault Circuit Interrupter (GFCI) or residual current device (RCD) to automatically disconnect the power supply of the generator in the event of a leakage fault to ensure equipment operation. personal safety of personnel. The defect of the electric heating system of the paver screed in the prior art is that when a leakage fault occurs, it is often necessary to use a multimeter, such as a multimeter, to manually detect the electric heating elements of each sub-section screed, which is time-consuming, labor-intensive and unreliable. .

SUMMARY OF THE INVENTION

In view of the above problems, the present invention proposes an electric heating system for a paver screed, a paver and a method for detecting leakage of the paver screed, which can automatically detect the leakage section safely, quickly and effectively when a leakage fault occurs.

To achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the present invention is realized through the following technical solutions:

In a first aspect, the present invention provides an electric heating system for a paver screed, including a power generation device, a main heating switch, a leakage protection device, a heating control device and a plurality of electric heating units; it also includes a leakage detection and control device;

The output end of the power generating device is connected to the input end of the main heating switch;

The output ends of the main heating switch are respectively connected with the input ends of the sub heating switches in each electric heating unit;

The output end of the sub-heating switch in each electric heating unit is connected with an electric heating element;

The leakage protection device is used to detect whether leakage occurs in the electric heating system of the paver screed, and the output ends thereof are respectively connected with the input ends of the heating control device and the leakage detection control device;

The output ends of the heating control device are respectively connected with the control ends of the sub-heating switch and the main heating switch in each electric heating unit;

The output ends of the leakage detection and control device are respectively connected with the control ends of the sub-heating switches in each electric heating unit;

When the leakage protection device detects the leakage current, the leakage protection device sends a leakage signal to the leakage detection and control device, and the leakage detection and control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element and receives the detection of the leakage protection device. Signal to detect whether there is a leakage fault in each electric heating unit.

Preferably, the electric heating system for the paver screed further includes several temperature sensors, and the number of the temperature sensors is the same as the number of the electric heating units; each temperature sensor and the corresponding electric heating unit are respectively installed in each sub-section on the segment screed; the heating control device controls the on-off of the power supply of the corresponding electric heating element through the corresponding sub-heating switch according to the temperature signal of the temperature sensor.

Preferably, when the leakage protection device detects that the leakage current is less than the first set current value, the leakage protection device or the heating control device does not control the main heating switch to cut off the power supply of the power generating device to each electric heating element, and the leakage protection device The device sends a leakage signal to the leakage detection and control device, and the leakage detection and control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element and receives the detection signal of the leakage protection device to detect whether each electric heating unit has a leakage fault.

Preferably, the electric heating system for the paver screed further includes a detection power device, the output ends of which are respectively connected to the input ends of the sub-heating switches in each electric heating unit, and the control end of which is connected to the output end of the leakage detection control device. ;

When the leakage protection device detects that the leakage current is greater than the second set current value, the leakage protection device directly controls the main heating switch to cut off the power supply of the generator or the leakage protection device sends a leakage signal to the heating control device and the heating control device controls the main heating The switch cuts off the power supply to the generator;

The electric leakage detection control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element, controls the detection power device to provide electric power for electric leakage detection to each sub-heating switch, and receives the detection signal from the electric leakage protection device, and checks whether each electric heating unit is Check for leakage faults.

In a second aspect, the present invention provides a paver, comprising the electric heating system for a paver screed in any one of the first aspects.

In a third aspect, the present invention provides a leakage detection method for a paver screed, comprising:

Use the leakage protection device to detect whether there is leakage in the electric heating system of the paver screed;

When the leakage protection device detects that there is leakage in the electric heating system of the paver screed, the leakage protection device sends a leakage signal to the leakage detection and control device, and the leakage detection and control device sequentially controls each sub-heating switch to turn on the corresponding electric heating It also receives the detection signal of the leakage protection device to detect whether there is leakage fault in each electric heating unit.

Preferably, when the leakage protection device detects that the leakage current is less than the first set current value, the leakage protection device or the heating control device does not control the main heating switch to cut off the power supply of the power generating device to each electric heating element;

The leakage protection device sends a leakage signal to the leakage detection and control device, and the leakage detection and control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element and receives the detection signal of the leakage protection device to check whether each electric heating unit has leakage. fault is detected.

Preferably, when the leakage protection device detects that the leakage current is greater than the second set current value, the leakage protection device directly controls the main heating switch to cut off the power supply of the generator or the leakage protection device sends a leakage signal to the heating control device and the heating control device Control the main heating switch to cut off the power supply of the generator;

The electric leakage detection control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element, controls the detection power device to provide electric power for electric leakage detection to each sub-heating switch, and receives the detection signal from the electric leakage protection device, and checks whether each electric heating unit is Check for leakage faults.

Beneficial effects of the present invention:

The invention provides a safe, fast and effective automatic detection device and method for the electric heating system of a paver screed electric heating system, which can automatically detect which sub-section screed is within a few seconds after the electric leakage fault occurs. Or leakage faults occur in other parts, which greatly reduces the time and personnel input for leakage fault detection and maintenance.

Description of drawings

FIG. 1 is a schematic schematic diagram of an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The application principle of the present invention will be described in detail below with reference to the accompanying drawings.

Due to the electric heating system of the paver screed in the prior art, when a leakage fault occurs, it is often necessary to manually detect the electric heating elements of each sub-section screed by using, for example, a multimeter, which is time-consuming, labor-intensive and unreliable. Therefore, the present invention provides an electric heating system for a paver screed, a paver and a method for detecting the leakage of the paver screed, which can automatically detect the leakage fault location after a leakage fault occurs, and the detection process is safe, fast and effective. .

Example 1

An embodiment of the present invention provides an electric heating system for a paver screed, including a power generation device, a main heating switch, a leakage protection device, a heating control device, a plurality of electric heating units, and a leakage detection control device;

The output end of the power generating device is connected to the input end of the main heating switch, and is used to supply power to the electric heating elements in each sub-section screed; in the specific implementation of the embodiment of the present invention, the power generating device is three. Phase asynchronous alternator or other generator with equivalent function;

The output ends of the main heating switch are respectively connected with the input ends of the sub heating switches in each electric heating unit, and are used to control the on-off of the power supply of the power generation device; in the specific implementation of the embodiment of the present invention, the main heating The switch is a relay or other electrical components that can realize the switch function;

The output end of the sub-heating switch in each electric heating unit is connected with an electric heating element, and the control end of the sub-heating switch is respectively connected with the heating control device and the leakage detection control device; in the specific implementation of the embodiment of the present invention, The sub-heating switches are relays or other electrical components capable of switching functions; the sub-heating switches are used to control the on-off of the electric heating elements in the corresponding sub-section screeds; the number of the electric heating units is at least 2 ;

The leakage protection device is used to detect whether leakage occurs in the electric heating system of the paver screed, and the output ends thereof are respectively connected with the input ends of the heating control device and the leakage detection control device; in one of the embodiments of the present invention In a specific embodiment, the leakage protection device can be a common ground fault circuit interrupter (GFCI) or a residual current device (RCD), and the GFCI and RCD detect whether there is leakage in the electric heating circuit through electromagnetic effects;

The output end of the heating control device is respectively connected with the control end of the sub-heating switch and the main heating switch in each electric heating unit, and is used to control the main heating switch and/or the sub-heating switch;

The output ends of the leakage detection and control device are respectively connected with the control ends of the sub-heating switches in each electric heating unit, and are used for receiving the detection signal of the leakage protection device and sequentially controlling each sub-heating switch to turn on the corresponding The electric heating element of the sub-section screed performs leakage detection; preferably, the leakage detection control device also sends the leakage detection information of the sub-section screed to a display for display.

In a specific implementation of the embodiment of the present invention, the heating control device and the leakage detection control device are integrated into one device. In other implementations of the embodiment of the present invention, the heating control device and the leakage detection control device are Separate stand-alone unit.

Further, in a specific implementation of this embodiment, the electric heating system for the paver screed further includes several temperature sensors, and the number of the temperature sensors is the same as the number of the electric heating units; The sensor and the corresponding electric heating unit are respectively installed on each sub-section screed; the heating control device independently controls the electric heating element of the corresponding sub-section screed according to the temperature signal of the temperature sensor, and the heating control device According to the temperature signal of the temperature sensor, the on-off of the power supply of the corresponding electric heating element is controlled through the corresponding sub-heating switch, specifically:

When the temperature of a sub-section screed detected by the temperature sensor is lower than the first set temperature, the heating control device controls the corresponding sub-heating switch to turn on the corresponding electric heating element to heat the corresponding sub-section screed;

When the temperature sensor detects that the temperature of a certain subsection screed is higher than the second set temperature, it controls the corresponding sub heating switch to cut off the power supply of the corresponding electric heating element, and stops heating the corresponding subsection screed.

Further, the electric heating system of the paver screed also includes a detection power device, the output end of which is connected to the input end of each sub-heating switch, and the control end of which is connected to the output end of the leakage detection control device, used for After the main heating switch cuts off the power supply of the power generation device, the leakage detection power is provided to the electric heating elements in the sub-section screed. When the leakage protection device or the heating control device controls the main heating switch to cut off the power supply, the leakage detection The detection and control device sequentially controls the sub-heating switches to turn on the electric heating elements of the corresponding sub-section screed. When the main heating switch cuts off the power supply of the generator, it can still detect whether there is a leakage fault on each sub-section screed. Because the high-voltage pulse acts on each electric heating element for a very short time, it will not cause personal injury to the equipment operator in the case of leakage. The detection power device may automatically provide the detection power every time interval, or more ideally, be controlled by the leakage detection control device to provide the detection power.

In a specific implementation of the embodiment of the present invention, the leakage protection device and the detection power device are integrated into one device, and in other implementations of the embodiment of the present invention, the leakage protection device and the detection power device are separate stand-alone device;

To sum up, the working principle of the electric heating system for the paver screed in the embodiment of the present invention is as follows:

When the leakage protection device detects that the leakage current is less than the first set current value, that is, the leakage fault is relatively minor, the leakage protection device or the heating control device does not control the main heating switch to cut off the power supply of the generator to each electric heating element, and only The leakage warning information is sent to the display by the heating control device for display; the leakage protection device sends a leakage signal to the leakage detection control device, and the leakage detection control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element and receives the leakage current The detection signal of the protection device is used to detect whether there is a leakage fault in each electric heating unit; that is, when the leakage fault is minor, the main heating switch is not cut off, and the leakage protection device is a residual current device, because the generator is still supplying the electric heating elements. Provide power, so it can detect whether there is leakage fault on each sub-section screed without additional detection power device;

When the leakage protection device detects that the leakage current is greater than the second set current value, that is, the leakage fault is serious, for safety reasons, the leakage protection device directly controls the main heating switch to cut off the power supply of the generator or sends a leakage signal to the leakage protection device. The heating control device controls the main heating switch to cut off the power supply of the power generation device; the detection power device provides the electric heating element with electric power for leakage detection through each sub-heating switch, and the leakage detection control device sequentially controls each electric heating element. The sub-heating switch turns on the corresponding electric heating element and receives the detection signal of the leakage protection device, so as to detect whether each heating unit has a leakage fault. That is, when the leakage fault is serious and the main heating switch cuts off the power supply of the generator, it is appropriate to configure a detection power device in the electric heating system of the paver screed.

The screed usually includes at least two sub-segment screeds that are combined by hydraulic expansion or mechanical assembly. As shown in FIG. , sub-section screed 2, sub-section screed 3, sub-section screed 4), the corresponding electric heating elements are electric heating element 1, electric heating element 2, electric heating element 3, electric heating element 4, corresponding sub-section screed The heating switches are sub-heating switch 1, sub-heating switch 2, sub-heating switch 3, and sub-heating switch 4, respectively, and the corresponding temperature sensors are temperature sensor 1, temperature sensor 2, temperature sensor 3, temperature sensor 4. During the heating process, if the heating control device receives the leakage signal sent by the leakage protection device and judges that the leakage fault is serious, it will control the main heating switch to cut off the power supply of the generator (generator) to each electric heating element . In addition, after the leakage detection control device receives the leakage signal sent by the leakage protection device, the leakage detection control device sequentially controls the sub-heating switch 1, heating switch 2, heating switch 3, and heating switch 4 to turn on the corresponding sub-section screeds. The electric heating element and the control detection power device provide detection power supply to the electric heating element of the corresponding sub-section screed, and the leakage detection unit also receives the detection signal of the leakage protection device to detect whether each sub-section screed has a leakage fault. Finally, the leakage detection control device also sends the leakage detection information of the sub-section screed to the display for display, such as the serial number of the sub-section screed where the leakage fault occurs on the display, one\two\three\four or other devices with similar indicating functions. Fault code information. It is easy to understand that if no leakage faults are detected for sub-section screeds one, two, three and four, it means that other parts such as the generator itself have leakage faults.

In addition, the embodiments of the present invention only point out some basic components required by the electric heating system of the paver screed to achieve the purpose of the present invention. However, it is easy to imagine that in practical applications, the electric heating system of the paver screed may also be Some other components will be added, such as emergency stop switches, overload protection relays, etc.

Example 2

An embodiment of the present invention provides a paver, including the electric heating system for the screed of the paver described in Embodiment 1.

Example 3

An embodiment of the present invention provides a method for detecting electric leakage of a paver screed, comprising:

Use the leakage protection device to detect whether there is leakage in the electric heating system of the paver screed;

When the leakage protection device detects that there is leakage in the electric heating system of the paver screed, the leakage protection device sends a leakage signal to the leakage detection and control device, and the leakage detection and control device sequentially controls each sub-heating switch to turn on the corresponding electric heating It also receives the detection signal of the leakage protection device to detect whether there is leakage fault in each electric heating unit.

When the leakage protection device detects that the leakage current is less than the first set current value, the leakage protection device or the heating control device does not control the main heating switch to cut off the power supply of the generator to each electric heating element; the leakage protection device Send a leakage signal to the leakage detection and control device, and the leakage detection and control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element and receives the detection signal of the leakage protection device to detect whether each electric heating unit has a leakage fault.

When the leakage protection device detects that the leakage current is greater than the second set current value, the leakage protection device directly controls the main heating switch to cut off the power supply of the generator or the leakage protection device sends a leakage signal to the heating control device and the heating control device controls the main heating The switch cuts off the power supply to the generator;

The electric leakage detection control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element, controls the detection power device to provide electric power for electric leakage detection to each sub-heating switch, and receives the detection signal from the electric leakage protection device, and checks whether each electric heating unit is Check for leakage faults.

The leakage detection method of the paver screed in the embodiment of the present invention can be applied to the electric heating system of the paver screed in the first embodiment or the paver in the second embodiment.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. An electric heating system for a paver screed, comprising a power generation device, a main heating switch, a leakage protection device, a heating control device and several electric heating units; it is characterized in that: it also includes a leakage detection control device and a detection power device; The output end of the power generating device is connected to the input end of the main heating switch; The output ends of the main heating switch are respectively connected with the input ends of the sub heating switches in each electric heating unit; The output end of the sub-heating switch in each electric heating unit is connected with an electric heating element; The leakage protection device is used to detect whether leakage occurs in the electric heating system of the paver screed, and the output ends thereof are respectively connected with the input ends of the heating control device and the leakage detection control device; The output ends of the heating control device are respectively connected with the control ends of the sub-heating switch and the main heating switch in each electric heating unit; The output ends of the leakage detection and control device are respectively connected with the control ends of the sub-heating switches in each electric heating unit; when the leakage protection device detects the leakage current, the leakage protection device sends a leakage signal to the leakage detection and control device, so the leakage protection device sends a leakage signal to the leakage detection control device. The leakage detection control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element and receives the detection signal of the leakage protection device, so as to detect whether each electric heating unit has a leakage fault; The output ends of the detection power device are respectively connected with the input ends of the sub-heating switches in each electric heating unit, and the control end thereof is connected with the output end of the leakage detection control device; When the leakage protection device detects that the leakage current is greater than the second set current value, the leakage protection device directly controls the main heating switch to cut off the power supply of the generator or the leakage protection device sends a leakage signal to the heating control device and the heating control device controls the main heating The switch cuts off the power supply to the generator; The electric leakage detection control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element, controls the detection power device to provide electric power for electric leakage detection to each sub-heating switch, and receives the detection signal from the electric leakage protection device, and checks whether each electric heating unit is Check for leakage faults. 2 . The electric heating system for a paver screed according to claim 1 , wherein the electric heating system for the paver screed further comprises a plurality of temperature sensors, and the number of the temperature sensors is the same as the number of the temperature sensors. 3 . The number of electric heating units is the same; each temperature sensor and the corresponding electric heating unit are respectively installed on each sub-section screed; the heating control device controls the corresponding electric heating element through the corresponding sub-heating switch according to the temperature signal of the temperature sensor. On-off of the power supply. 3. An electric heating system for a paver screed according to claim 1, wherein when the leakage protection device detects that the leakage current is less than the first set current value, the leakage protection device or the heating control device The main heating switch is not controlled to cut off the power supply of the power generation device to each electric heating element, the leakage protection device sends a leakage signal to the leakage detection control device, and the leakage detection control device sequentially controls each sub heating switch to turn on the corresponding electric heating element And receive the detection signal of the leakage protection device to detect whether each electric heating unit has leakage fault. 4. A paver, characterized in that it comprises the electric heating system for a paver screed according to any one of claims 1-3. 5. A method for detecting electric leakage of a paver screed, characterized by comprising: an electric heating system for a paver screed, wherein the electric heating system for a paver screed comprises a power generation device, a main heating switch, a leakage protection device, Heating control device and several electric heating units, also including leakage detection control device and detection power device; The output end of the power generating device is connected to the input end of the main heating switch; The output ends of the main heating switch are respectively connected with the input ends of the sub heating switches in each electric heating unit; The output end of the sub-heating switch in each electric heating unit is connected with an electric heating element The output ends of the leakage protection device are respectively connected with the input ends of the heating control device and the leakage detection control device; The output ends of the heating control device are respectively connected with the control ends of the sub-heating switch and the main heating switch in each electric heating unit; The output ends of the leakage detection and control device are respectively connected with the control ends of the sub-heating switches in each electric heating unit; The output ends of the detection power device are respectively connected with the input ends of the sub-heating switches in each electric heating unit, and the control end thereof is connected with the output end of the leakage detection control device; The method includes: Use the leakage protection device to detect whether there is leakage in the electric heating system of the paver screed; When the leakage protection device detects that there is leakage in the electric heating system of the paver screed, the leakage protection device sends a leakage signal to the leakage detection and control device, and the leakage detection and control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element and receive the detection signal of the leakage protection device to detect whether there is a leakage fault in each electric heating unit; When the leakage protection device detects that the leakage current is greater than the second set current value, the leakage protection device directly controls the main heating switch to cut off the power supply of the generator or the leakage protection device sends a leakage signal to the heating control device and the heating control device controls the main heating The switch cuts off the power supply to the generator; The electric leakage detection control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element, controls the detection power device to provide electric power for electric leakage detection to each sub-heating switch, and receives the detection signal from the electric leakage protection device, and checks whether each electric heating unit is Check for leakage faults. 6. a kind of paver screed leakage detection method according to claim 5 is characterized in that: When the leakage protection device detects that the leakage current is less than the first set current value, the leakage protection device or the heating control device does not control the main heating switch to cut off the power supply of the power generating device to each electric heating element; The leakage protection device sends a leakage signal to the leakage detection and control device, and the leakage detection and control device sequentially controls each sub-heating switch to turn on the corresponding electric heating element and receives the detection signal of the leakage protection device to check whether each electric heating unit has leakage. fault is detected.

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