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WO2011120393A1 - Système et procédé permettant d'éviter le glissement au cours du levage secondaire d'une grue - Google Patents

Système et procédé permettant d'éviter le glissement au cours du levage secondaire d'une grue Download PDF

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Publication number
WO2011120393A1
WO2011120393A1 PCT/CN2011/072049 CN2011072049W WO2011120393A1 WO 2011120393 A1 WO2011120393 A1 WO 2011120393A1 CN 2011072049 W CN2011072049 W CN 2011072049W WO 2011120393 A1 WO2011120393 A1 WO 2011120393A1
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WO
WIPO (PCT)
Prior art keywords
crane
sensor
driving
hydraulic
lifting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2011/072049
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English (en)
Chinese (zh)
Inventor
詹纯新
刘权
高一平
宋春阳
黄赞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Zoomlion Special Vehicle Co Ltd
Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd
Original Assignee
Hunan Zoomlion Special Vehicle Co Ltd
Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Zoomlion Special Vehicle Co Ltd, Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd filed Critical Hunan Zoomlion Special Vehicle Co Ltd
Publication of WO2011120393A1 publication Critical patent/WO2011120393A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/24—Operating devices
    • B66D5/26—Operating devices pneumatic or hydraulic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/40—Control devices
    • B66D1/42—Control devices non-automatic
    • B66D1/44—Control devices non-automatic pneumatic of hydraulic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/54—Safety gear

Definitions

  • the present invention relates to a secondary hoisting and lowering prevention system for a crane, and more particularly to a system for preventing a secondary hoisting down of a crane by controlling the operation of the brake. Furthermore, the present invention relates to a method for preventing a secondary lifting and lowering of a crane. Background technique
  • a crane is a mechanical device used to transfer an object from one spatial location to another.
  • the most common problem during lifting operations of a crane is the "secondary rise and fall" of the crane.
  • the so-called “secondary rise and fall” of the crane means that when the heavy object hovering in the air is lifted for the second time (or the third time, etc.), the heavy object tends to fall by a certain distance before it can rise normally. .
  • This "secondary rise and fall” may cause major safety accidents. For example, when the distance from the ground is low, the down phenomenon may cause heavy objects to reach pedestrians or operators, especially the lifting force of the crane. This downturn may be exacerbated when the speed is slower.
  • secondary lifting is a general term in the technical field, and the “secondary” is not limited to the “second time”, but refers to the "first lifting” of the crane. The subsequent lifting operation, therefore, the person skilled in the art also refers to “secondary lifting” as “re-uplifting” or “subsequent lifting” and the like.
  • a special hydraulic component ie, a pressure memory system consisting of an accumulator and a check valve, see Chinese utility model patent CN2040896U, CN2708022Y
  • this special hydraulic component can only be applied to open hydraulic systems, but not to closed hydraulic systems. (Since the closed hydraulic system itself forms a closed drive hydraulic circuit, the amount of drive fluid in the hydraulic circuit is basically fixed.
  • the method is mainly applicable to a closed hydraulic system (the working pressure in the hydraulic circuit of the closed hydraulic system is relatively stable, so the detection is relatively easy), but in the conventional technical solution, the pressure stored in the memory is not accurate, which is Since the hoisting mechanism impacts the hydraulic fluid during the previous braking, thereby causing pressure fluctuations, the pressure value stored in the memory may be The peak pressure value or the valley pressure value. If the memory stores the peak pressure value, the instantaneous impact is caused by the excessive lifting force at the beginning of the secondary lifting, which will damage the crane's wire rope and related components.
  • the prior art is substantially only It is to compare the working pressure of the hydraulic fluid at the time of the second lifting with the working pressure stored at the end of the previous lifting, rather than the pressure (weight) of the load, so that it is easy to deviate from the actual load weight. And caused a serious secondary ups and downs.
  • An object of the present invention is to provide an anti-secondary lifting and lowering system for a crane which is capable of effectively preventing a secondary lifting of the crane when the crane is subjected to secondary lifting.
  • the present invention also provides a method for preventing secondary lifting and lowering of a crane.
  • an anti-secondary lifting and lowering system for a crane comprises a load gravity sensor, a driving variable sensor, an electronic control unit and a brake driving device, wherein the load gravity sensor detects a load gravity of the crane and transmits a load gravity signal to the electronic control a driving variable sensor that detects a driving variable signal related to a lifting driving force of the crane, and transmits the driving variable signal to the electronic control unit, wherein the electronic control unit calculates the driving variable signal according to the driving variable signal Determining a value of the rising driving force, and comparing the value of the lifting driving force with the load gravity signal, wherein the electronic control unit controls the brake when the load gravity is equal to the lifting driving force
  • the driving device is such that the brake of the crane is released from the braking state.
  • the driving variable sensor is a hydraulic sensor
  • the hydraulic sensor The hydraulic pressure of the driving liquid is detected when the crane performs the secondary lifting, and the hydraulic pressure signal is transmitted to the electronic control unit, and the electronic control unit calculates the lifting driving force by the following formula:
  • F is the hoisting driving force
  • V g is the displacement of the hydraulic motor of the crane
  • ⁇ is the hydraulic pressure of the driving fluid detected by the hydraulic sensor
  • m is the magnification of the pulley block of the hoisting mechanism of the crane
  • Ti is the total mechanical and hydraulic efficiency of the hydraulic drive system of the crane
  • Is the diameter of the reel of the hoisting mechanism
  • ⁇ is the number of layers of the steel cable wound on the reel of the hoisting mechanism
  • d is the diameter of the steel cable
  • n s is the single pulley of the pulley block Mechanical efficiency.
  • the present invention also provides a method for preventing secondary lifting and lowering of a crane, wherein the method for preventing secondary lifting and lowering includes the following steps: detecting a load gravity and a lifting driving variable of the crane, and according to the lifting The driving variable calculates a lifting driving force; comparing the lifting driving force with the load gravity; and controlling the brake of the crane to release the braking state when the lifting driving force is equal to the load gravity.
  • the anti-secondary lifting and lowering system and method of the present invention calculates the lifting force by detecting the load gravity in real time and continuously through the driving variable detected in real time, by comparing the lifting driving force and the load gravity, only in the two At this time, the braking state of the brake is released.
  • the present invention can automatically perform matching control according to different loads and different working conditions, so that the load smoothly performs secondary lifting, effectively preventing the weight from falling, and making the crane
  • the phenomenon of secondary lifting and falling down is completely eliminated, the possibility of accidents caused by human error is greatly reduced, the lifting operation is simple and reliable, and the safety is effectively improved.
  • the anti-secondary lifting and lowering system and method of the present invention can be applied not only to hydraulic systems of the open hydraulic system and closed hydraulic system type, but also to cranes of various drive types, which have universal applicability.
  • FIG. 1 is a schematic view showing a connection structure of a secondary hoisting and lowering prevention system according to a preferred embodiment of the present invention
  • FIG. 2 is a view showing an example of a brake employed in the anti-secondary lifting and lowering system of the present invention. Description of the reference signs:
  • the effective way to solve the problem of the secondary lifting and lowering of the crane is to establish a real-time detection of the anti-secondary lifting and lowering system, which can dynamically move the crane during the secondary lifting.
  • the load gravity G and the hoisting driving force F are detected, and the increasing hoisting driving force F is compared with the load gravity G, and the braking of the brake 3 is released only when the hoisting driving force F is equal to the load gravity G.
  • the anti-secondary lifting and lowering system includes a load gravity sensor 23, a drive variable sensor, an electronic control unit (or controller) 25, and a brake drive.
  • the device wherein the load gravity sensor 23 detects the load gravity, and transmits the load gravity signal to the electronic control unit 25, for example, the load gravity signal transmission line 27 can be used for transmission of the load gravity signal by a wired or wireless form, the drive variable sensor detecting a drive variable signal associated with the hoisting driving force of the crane, and transmitting the drive variable signal to the electronic control unit 25, for example, by wire or wireless
  • the drive variable signal transmission line 26 performs transmission of a drive variable signal
  • the electronic control unit 25 receives the load gravity signal and the drive variable signal, and calculates a value of the lift drive force based on the drive variable signal
  • the electronic control unit 25 Comparing the value of the hoisting driving force with the received load gravity signal, the electronic control unit 25 operating the brake drive, for example, via the brake control line 30 when the hoisting driving force is equal to the load gravity
  • the device is such that the brake 3 of the crane is released from the braking state.
  • the load gravity sensor 23 generally employs a pressure sensor, that is, a detection circuit composed of strain gauges to detect the load weight. Since the load gravity is constant in the process of lifting the same object in the case where the working state of the crane does not occur, the detection of the load gravity is relatively easy.
  • the strain gauge can be placed on a hook or the like of the crane to accurately detect the load gravity G.
  • the load gravity sensor 23 is not limited to the form of a pressure sensor, and a tension sensor, a load cell, or the like may be used.
  • the load gravity signal can be transmitted to the electronic control unit 25 via the load gravity signal transmission line 27.
  • the transmitted load gravitational signal directly represents the magnitude of the load gauze G, which does not require the electronic control unit 25 to perform the conversion calculation.
  • the hoisting driving force F In terms of the hoisting driving force F at the time of the second lifting of the crane, since the crane generally drives the hoisting mechanism 1 to rotate by the driving source to lift the heavy object, the hoisting driving force F cannot be directly detected by the relevant sensor. Instead, the relevant drive variable needs to be detected by the drive variable sensor, and the value of the lift drive force is calculated by the electronic control unit 25 based on the drive variable.
  • the anti-secondary lifting and lowering system shown in Figures 1 and 2 is suitable for the most widely used hydraulic cranes, and the anti-secondary lifting and lowering system uses a unique method to accurately calculate the lifting driving force based on the driving variables. method.
  • the basic structure of a hydraulic crane is basically similar to that of a conventional hydraulic crane, which includes a hoisting mechanism 1 for winding or releasing a steel cable 6, which passes at the lower end of the steel cable 6.
  • the hook lifts the weight 11.
  • the hoisting mechanism 1 is driven by a hydraulic motor 4, and in Fig. 1, the hydraulic circuit system that drives the hydraulic motor 4 constitutes an open hydraulic system in which the hydraulic pump 10 draws a driving fluid (e.g., hydraulic oil) from a driving fluid tank 22 (e.g., a fuel tank).
  • a driving fluid e.g., hydraulic oil
  • the driving fluid is driven by the driving fluid line 28 and driven by the main switching valve 8 and the balancing valve 7 to drive the hydraulic motor 4, and the driving liquid discharged from the hydraulic motor 4 is re-introduced into the driving liquid tank 22 via the hydraulic motor discharging line 29.
  • the 1 further includes a brake 3 and a safety valve 9, which is mainly used to stop the hoisting mechanism 1 from rotating, and during the lifting of the weight 11 by the crane, when the weight 11 is required to temporarily stay in the space
  • the brake 3 is also used to fix the hoisting mechanism 1 to prevent the hoisting mechanism 1 from rotating under the weight of the weight 11
  • the safety valve 9 is mainly used to return a small amount of driving liquid to the driving liquid tank 22 when the hydraulic pressure is too high.
  • the anti-secondary lifting and lowering system of the preferred embodiment of the present invention is applied to the hydraulic crane.
  • the anti-secondary lifting and lowering system of the preferred embodiment includes a load gravity sensor 23, which employs a pressure sensor in FIG. 1 and is disposed at a hook portion at the lower end of the steel cable 6 to Check the load gravity (ie the load weight).
  • the load gravity sensor 23 can be coupled to the electronic control unit 25 via a load gravity signal transmission line 27 to enable transmission of the load gravity signal to the electronic control unit 25.
  • the torque limiter 24 is known as a computer-controlled safety operating system, which can automatically detect the crane loading The quality and angle of the boom.
  • a pressure sensor for detecting the load gravity is included in the constituent members of the torque limiter 24, and therefore, in a preferred manner, the anti-secondary lifting and lowering system of the present invention does not need to provide a dedicated pressure sensor, which is completely compatible with
  • the torque limiter shares a pressure sensor 23, in which case the electronic control unit 25 can be directly connected to the main body of the torque limiter 24, for example by means of a load gravity signal transmission line 27, so that it can be read directly from the main body of the torque limiter.
  • Load gravity signal is included in the constituent members of the torque limiter 24, and therefore, in a preferred manner, the anti-secondary lifting and lowering system of the present invention does not need to provide a dedicated pressure sensor, which is completely compatible with
  • the torque limiter shares a pressure sensor 23, in which case the electronic control unit 25 can be directly connected to the main body of the torque limiter 24, for example by means of a load gravity signal transmission line 27, so that it can be read directly from the main body of the torque limiter.
  • Load gravity signal
  • the anti-secondary lift-down system further includes a drive variable sensor to detect a drive variable associated with the secondary lift drive force.
  • the drive variable sensor uses a hydraulic sensor 5, which It is one of the key technologies in the preferred embodiment of the present invention.
  • the hydraulic pressure of the driving fluid is directly related to the lifting driving force, and the detection is relatively easy.
  • the increasing hydraulic pressure can most intuitively reflect the secondary lifting driving force.
  • the size, and relative to other detection methods (described below), can detect the magnitude of the lifting drive force more accurately and in a timely manner.
  • the problem is that only the hydraulic pressure of the driving liquid is detected by the hydraulic pressure sensor 5, and how to convert such hydraulic pressure calculation into the driving force for the secondary lifting is a technical problem that is difficult.
  • the inventors of the present application have obtained a large amount of data summary, derivation, and calculation, and obtained the following formula (1) for the hydraulic pressure of the driving liquid and the lifting driving force at the second lifting:
  • v g is the displacement of the hydraulic motor.
  • the displacements of different types of hydraulic motors each have a fixed value
  • p is the hydraulic pressure of the driving fluid (i.e., the hydraulic pressure value detected by the hydraulic sensor 5);
  • m is the magnification of the pulley block of the hoisting mechanism.
  • the magnification of the pulley block refers to the multiple of the power saving of the pulley block, that is, the multiple of the deceleration, and the number of the cable branches is assumed to be n.
  • ⁇ ⁇ is the total mechanical and hydraulic efficiency of the hydraulic drive system of the crane.
  • the hydraulic pump, hydraulic motor and hoisting mechanism will have corresponding hydraulic losses (such as volume loss) and mechanical losses, so the hydraulic pressure
  • the total work done by the drive system ie, the total energy consumed
  • the ratio of the useful work to the total work is the total mechanical hydraulic efficiency
  • d is the diameter of the steel cable
  • n s is the mechanical efficiency of a single pulley.
  • the unit of ⁇ adopts Pa (ie, N/m2), and accordingly other
  • the diameter parameter should also be converted to participate in the calculation in units of m.
  • the matching conversion of such a unit is conceivable to those skilled in the art, and in addition to the hydraulic pressure of the driving liquid, the values of other parameters can be input into the electrons in advance.
  • the control unit 25, may input a plurality of values corresponding to different liquid temperatures for the electronic control unit 25 to perform ⁇ ⁇ ⁇ selection at the corresponding temperature. Of course, the ti value fluctuations at different liquid temperatures are compared. Minor, even if this selection is not made, an average value of ti is input in advance, which does not affect the reliability of the system of the present invention.
  • a hydraulic pressure sensor 5 is disposed on a driving fluid line of the hydraulic motor 4 (i.e., disposed on a line between an output end of the hydraulic pump 10 and an input end of the hydraulic motor 4), and is connected by a drive variable signal transmission line 26.
  • the hydraulic pressure signal of the driving liquid can be transmitted to the electronic control unit (or controller) 25.
  • the electronic control unit 25 calculates the hoisting driving force F at the time of the secondary hoist according to the hydraulic pressure of the received driving liquid and other parameters input in advance according to the above formula (1), and the value of the hoisting driving force F is The received load gravitation G signal is compared. It should be noted that during the secondary lifting of the hydraulic crane, the hydraulic pressure of the driving fluid is gradually increased, for which the hydraulic pressure sensor 5 continuously detects the hydraulic pressure of the driving liquid in real time, and the electronic control unit 25 continuously calculates the respective hydraulic pressures. The corresponding lifting driving force F is compared, and each lifting driving force F is compared with the load pressure G one by one. When the value F of the lifting driving force is equal to the load gravity G, the electronic control unit 25 can pass the brake control line, for example.
  • the brake drive unit employs a solenoid valve 2, and the brake 3 is a hydraulically controlled brake.
  • the brake In the case where the load weight 11 temporarily stays in the air, the brake is in a braking state in order to prevent the load weight 11 from slipping.
  • the solenoid valve 2 is controlled by the electronic control unit 25 to turn on the brake driving line 13 once the lifting driving force F is equal to the load gravity G.
  • the brake fluid e.g., hydraulic oil
  • the driving fluid pushes the piston 17 to the left, thereby driving the outer friction plate 18 and the inner friction plate 19 (the inner friction plate 19 is fixedly connected directly or indirectly to the drive shaft 20 of the hydraulic motor) to release the brake 3.
  • the braking state allows the crane to smoothly achieve a secondary lift without falling.
  • the seal ring 16 is mainly used to prevent leakage of the driving liquid.
  • the specific type of the brake 3 is not limited to that shown in Fig. 2, and various known drive shaft brakes of the crane can be employed.
  • the overall working process of the anti-secondary lifting and lowering system of the preferred embodiment of the present invention is as follows: After the initial lifting operation of the crane, the load weight 11 is hovering in the air, and the brake 3 is in the braking state.
  • the hydraulic pump 10 supplies liquid to the hydraulic circuit, such as hydraulic oil, and the hydraulic oil passes through the main reversing valve 8 and the balancing valve 7 to the input end of the hydraulic motor 4, the hydraulic motor driving liquid
  • the oil pressure in the line 28 is gradually established from zero, and the driving force of the hydraulic motor 7 to the hoisting mechanism 1 is gradually increased from zero, during which the hydraulic pressure sensor 5 transmits the hydraulic pressure value detected in real time to the electronic control unit 25 (ie, control)
  • the device sends a signal to open the solenoid valve 2 to release the brake 3, achieving a second smooth lifting of the crane.
  • the present invention is applicable to a hydraulic crane (a hydraulic crane is most commonly used in the field of engineering), but the anti-secondary lifting and lowering system of the present invention is not limited to the above-described preferred embodiment, and It has a basic implementation that is universally applicable to various cranes, such as a crane using an electric motor as a power source.
  • the anti-secondary lifting and lowering system includes a load gravity sensor 23, a driving variable sensor, an electronic control unit (or controller) 25, and a brake driving device, wherein the load gravity sensor 23 detects Load gravity, and for example, the load gravity signal can be transmitted to the electronic control unit 25 via the load gravity signal transmission line 27, the drive variable sensor detecting a drive variable signal associated with the lifting drive force of the crane, and for example by driving
  • the variable signal transmission line 26 transmits the drive variable signal to the electronic control unit 25, the electronic control unit 25 receives the load gravity signal and the drive variable signal, and calculates a value of the lift drive force based on the drive variable signal, the electron
  • the control unit 25 compares the value of the hoisting driving force with the received load gravity signal, and when the load gravity G is equal to the hoisting driving force F, the electronic control unit 25 can be controlled by, for example, a brake Line 30 operating brake drive 3 so that the crane brake braking state is released.
  • the load gravity sensor 23 can be of various types, such as a pressure sensor, a tension sensor, a load cell, and the like. More preferably, as shown in FIG. 1, since the existing crane is generally provided with a torque limiter 24, the torque limiter 24 is known as a safety control system automatically controlled, which can automatically detect the crane being loaded. The quality and angle of the boom. That is to say, the pressure sensor for detecting the load gravity is included in the constituent members of the torque limiter 24, and therefore, in the preferred manner, the anti-secondary lifting and lowering system of the present invention does not need to be provided with a dedicated pressure sensor, which is completely compatible with the torque.
  • the limiter shares a pressure sensor 23, in which case the electronic control unit 25 can be directly connected to the main body of the torque limiter 24, for example, via the load gravity signal transmission line 27, so that it can be read directly from the main body of the torque limiter 24.
  • Load gravity signal Load gravity signal.
  • the drive variable sensor is not limited to the hydraulic sensing in the case of the above hydraulic crane More preferably, the drive variable sensor can employ a torque sensor (not shown in the drawings).
  • a torque sensor In the case of using a torque sensor, the anti-secondary lifting and lowering system of the present invention can be applied to various types of cranes (such as cranes using electric motors as power sources, pneumatic cranes, etc.), and of course, hydraulic cranes.
  • the hydraulic pressure sensor 5 should be used to detect the hydraulic pressure of the drive liquid and pass the above formula (1).
  • the strain gauge of the torque sensor may be disposed on a portion where the brake 3 is in contact with the drive shaft 20 of the drive spool (e.g., the outer friction plate 18).
  • the reel is the reel of the hoisting mechanism 1
  • the drive shaft 20 of the drive reel refers to the drive shaft of the power source (such as an electric motor, a hydraulic motor), and the drive shaft 20 generally passes through a reducer (not Display) After deceleration, connect to the reel to reduce and increase the twist.
  • the arrangement position of the strain gauge is not limited thereto, and the strain gauge may be directly disposed on the drive shaft 20, but in this case, the connection contact between the strain gauge and the signal transmission line should be a movable contact (ie, Separate depending on the situation and engage when testing the torque. If a conventional fixed connection contact is used, it will interfere with the signal transmission line when the drive shaft rotates.
  • the torque signal measured by the torque sensor is input to the electronic control unit 25 through the drive variable signal transmission line 26, and the lift control force F is calculated by the electronic control unit 25 by the following formula (2):
  • Q is the torque on the drive shaft 20 measured by the torque sensor
  • n is the number of layers of the steel cable wound on the reel of the hoisting mechanism
  • d is the diameter of the steel cable
  • i is a reduction ratio of a speed reducer connected between the reel and the drive shaft 20;
  • the method of calculating the lifting force by the torque is used, which only considers the laminated thickness of the (n-1) layer cable, which is mainly considering the torque detected by the torque sensor. It is smaller than the actual value, so it is necessary to adjust the corresponding coefficient on the denominator.
  • the above formula (2) has proved that it can effectively solve the problem of secondary lifting of the crane through a large number of measured calculations.
  • the drive variable sensor may also employ other types of sensors to detect the drive variable associated with the lift drive force F.
  • a piezoelectric sensor may also be employed. By driving the piezoelectric sheet into contact with the drive shaft 20, the drive shaft 20 is driven. During the process of increasing torque, the corresponding distortion occurs, and the piezoelectric piece is squeezed. Therefore, the piezoelectric sensor generates different currents of different strengths, and the value of the current corresponds to different magnitudes of the lifting driving force F (electronic control unit) In 25, a correspondence table between the current value and the lifting driving force can be stored.
  • a photoelectric sensor can be used to detect the elastic distortion displacement of the drive shaft 20, thereby measuring the lift driving force F corresponding to the degree of the displacement displacement.
  • the electronic control unit 25 receives the signal of the load gravity G and compares the hoisting driving force F with the load gravity G. When the load gravity G is equal to the hoisting driving force F, the electronic control unit 25 drives the brake through the brake control line 30. The device transmits a control signal to cause the brake driving device to operate the brake 3, thereby releasing the braking state of the brake 3 to smoothly achieve the secondary lifting of the crane.
  • the brake driving device is not limited to the solenoid valve 2 according to the above preferred embodiment, and may be, for example, an electric retractor having a telescopic shaft, and the telescopic shaft can be energized when energized. It is telescopic to directly drive the piston 17 of the brake 3 (for example, FIG. 2). Further, the brake driving device can also be a relay switch valve or the like.
  • the brake 3 is only an operation object of the anti-secondary lifting and lowering system of the present invention, which belongs to a conventional component of the crane, it is not limited to the specific structural form shown in FIG. 2, but may be generally employed on a crane.
  • the brake 3 can also be pneumatic pneumatics, shoe brakes, and the like.
  • the method for preventing secondary lifting and lowering includes the following steps: detecting a load gravity G and a secondary lifting driving variable of the crane, and calculating a lifting driving force F according to the secondary lifting driving variable; F is compared with the load gravity G, and when the hoisting driving force F is equal to the load gravity G, the brake 3 of the control crane is released from the braking state.
  • the hydraulic pressure ⁇ of the driving liquid is detected by the hydraulic pressure sensor 5, and the lifting driving force F is calculated according to the above formula (1):
  • the driving torque Q of the crane is detected by the torque sensor, and according to the above-mentioned / input type (
  • the anti-secondary lifting and lowering system and method of the present invention can detect the load gravity G in real time, and continuously calculate the lifting driving force F by the driving variable detected in real time, by comparing the lifting drive.
  • Force F and load gravity G only when the two are equal, the brake state of the brake 3 is released, so that the matching control can be automatically performed according to different loads and different working conditions, so that the hoisting mechanism 1 completely eliminates the secondary lifting.
  • the downturn phenomenon greatly reduces the possibility of accidents caused by human error, makes the lifting operation simple and reliable, and effectively improves the safety. Fullness.
  • the anti-secondary lifting and lowering system and method of the present invention can be applied not only to hydraulic systems of the open hydraulic system and closed hydraulic system type, but also to cranes of various drive types, which have universal applicability.
  • the specific embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the specific structures described in the above drawings and descriptions.
  • Various modifications, such as electronic control units, are possible within the scope of the technical idea of the present invention.
  • the (ECU) may include a programmable control module or the like, and these obvious modifications are all within the scope of the present invention, and the scope of protection of the present invention is defined by the claims.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control And Safety Of Cranes (AREA)

Abstract

Le système ci-décrit, qui permet d'éviter le glissement au cours du levage secondaire d'une grue, comprend un capteur de poids de charge (23), un capteur de variable d'actionnement, un élément de commande électrique (25) et un dispositif d'actionnement de frein. Le capteur de poids de charge (23) détecte le poids de charge G de la grue, et le capteur de variable d'actionnement détecte le signal de variable d'actionnement. L'élément de commande électrique (25) reçoit le signal de poids de charge et le signal de variable d'actionnement, et il calcule une force motrice de hissage F basée sur ledit signal de variable d'actionnement. Lorsque la force motrice de hissage F est égale au poids de charge G, l'élément de commande électrique (25) fait fonctionner le dispositif d'actionnement de frein afin de libérer le frein (3). Ce système peut détecter le poids de charge G en temps réel, et calculer sans interruption la force motrice de hissage F à l'aide du signal de variable d'actionnement, afin de commander la grue automatiquement et avec précision suivant les différentes conditions de charge et de travail, dans le but d'éviter le glissement au cours du levage secondaire de la grue. L'invention concerne également un procédé permettant d'éviter le glissement au cours du levage secondaire d'une grue.
PCT/CN2011/072049 2010-04-01 2011-03-22 Système et procédé permettant d'éviter le glissement au cours du levage secondaire d'une grue Ceased WO2011120393A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2010101416266A CN102040161B (zh) 2010-04-01 2010-04-01 起重机的防二次起升下滑系统以及防二次起升下滑方法
CN201010141626.6 2010-04-01

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WO2011120393A1 true WO2011120393A1 (fr) 2011-10-06

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CN (1) CN102040161B (fr)
WO (1) WO2011120393A1 (fr)

Cited By (4)

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CN105486238A (zh) * 2015-12-25 2016-04-13 北京起重运输机械设计研究院 一种测量起重机构制动下滑量的方法及系统
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WO2018145806A1 (fr) * 2017-02-09 2018-08-16 Liebherr-Components Biberach Gmbh Engin de levage et procédé pour mettre en marche le mécanisme de levage d'un tel engin de levage
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