WO2013120350A1

WO2013120350A1 - Hydraulic control system for unwinding rope, hydraulic control system for winding rope and crane

Info

Publication number: WO2013120350A1
Application number: PCT/CN2012/081946
Authority: WO
Inventors: 詹纯新; 刘权; 高一平; 黎伟福; 涂凌志; 宋春阳; 张源; 李葳; 袁知华
Original assignee: 中联重科股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2012-02-13
Filing date: 2012-09-25
Publication date: 2013-08-22
Also published as: CN102556872B; CN102556872A

Abstract

Disclosed are a hydraulic control system for unwinding rope and a hydraulic control system for winding rope, both comprising an oil pump (101), a first reversing valve (102), a second reversing valve (103), a first motor (106), a second motor (107) and a control unit. The oil pump (101) is connected to an oil supply for the system, the first reversing valve (102) and the second reversing valve (103). The first reversing valve (102) and the second reversing valve (103) are respectively connected to the first motor (106) and the second motor (107). The hydraulic control system for unwinding rope further comprises a rope unwinding unit (105), wherein the rope unwinding unit (105) comprises a first balancing valve set and a second balancing valve set. The hydraulic control system for winding rope further comprises a rope winding unit (104), wherein the rope winding unit (104) comprises a first pressure regulation valve set and a second pressure regulation valve set. The control unit is used for controlling the first reversing valve (102), the second reversing valve (103), the rope unwinding unit (105) and/or the rope winding unit (104). Further disclosed is a crane comprising the hydraulic control systems for unwinding rope and for winding rope. In the hydraulic control systems, two motors working in cooperation can reliably achieve non-linear synchronization of rope unwinding and rope winding by two hoists, preventing the ropes from becoming tangled, facilitating debugging by an operator, and making a saving on costs.

Description

Rope release hydraulic control system, rope collecting hydraulic control system and crane

The present invention relates to the field of cranes, and more particularly to a rope release hydraulic control system, a rope collecting hydraulic control system and a crane. Background technique

At present, cranes require multiple hoists to cooperate. When these ropes are taken up or roped, the movement between the multiple hoists is nonlinear because the length of the rope, the size of the pulley, and the position of the rope on the boom are different. It is more difficult to control multiple winches to achieve synchronization.

If the hoisting ropes of the hoisting machines are not synchronized, the following problems will be caused: The hoisting opportunity with relatively slow rope speed will bear a large load, and the rope will be over-tightened, which will result in the service life of the rope and the service life of the hydraulic motor. Negative effects; the hoisting opportunity with relatively fast rope speed is subject to less load, even without load, and the rope is in a slack state. If it is too loose, the rope will be roped, which will seriously affect the normal operation of the crane.

In the prior art, the crane realizes the synchronization of multiple winches by adopting a closed-loop control mode. This control method requires the use of devices such as controllers and sensors, and the cost is high, and only a simple approximate linear synchronization can be realized, and debugging is difficult. Summary of the invention

The technical problem mainly solved by the present invention is to disclose a rope release hydraulic control system, a rope collecting hydraulic control system and a crane, which can reliably realize the nonlinear synchronization of the two hoists.

In order to solve the above technical problem, the present invention discloses a rope release hydraulic control system, the rope release hydraulic control system includes: an oil pump, the oil pump is in communication with the system oil source; the first reversing valve, the first reversing valve is connected to the oil pump; Two reversing valve, the second reversing valve is connected to the oil pump; the rope releasing unit, the rope collecting unit package a first balancing valve group and a second balancing valve group; a first motor, a first port of the first motor is connected to the first outlet of the first switching valve, and a second port of the first motor is passed through the first balancing valve group a second outlet connecting the first reversing valve; a second motor, the first port of the second motor is connected to the first outlet of the second reversing valve, and the second port of the second motor is connected to the second balancing valve group a second outlet of the two reversing valve; a control unit, the control unit is configured to control the first reversing valve, the second reversing valve and the rope releasing unit.

Wherein, the first balancing valve group includes a first balancing valve, the second port of the first motor is connected to the outlet of the first balancing valve, and the inlet of the first balancing valve is connected to the second outlet of the first switching valve, the first balance The control port of the valve is connected to the first port of the first motor; the second balance valve group comprises a second balance valve, the second port of the second motor is connected to the outlet of the second balance valve, and the inlet of the second balance valve is connected The second outlet of the second reversing valve, the control port of the second balancing valve is connected to the first port of the second motor.

Wherein, the spool of the first balancing valve has two states of one-way circulation and two-way throttle, and the initial state of the spool of the first balancing valve is one-way circulation; the spool of the second balancing valve has one-way circulation and two-way The two states are throttled, and the initial state of the spool of the second balancing valve is one-way circulation.

Wherein, the first balancing valve group includes a first shuttle valve, the first inlet of the first shuttle valve is connected to an external pressure oil source, and the second inlet of the first shuttle valve is connected to the first oil port of the first motor, the first shuttle valve The outlet is connected to the control port of the first balancing valve; the second balancing valve group includes a second shuttle valve, the first inlet of the second shuttle valve is connected to the external pressure oil source, and the second inlet of the second shuttle valve is connected to the first of the second motor The oil port, the outlet of the second shuttle valve is connected to the control port of the second balance valve.

Wherein, the first balancing valve group is connected with the first electromagnetic valve, and the first inlet of the first shuttle valve is connected to the external pressure oil source through the first electromagnetic valve for turning on or blocking the external pressure oil source; the second balancing valve group A second solenoid valve is connected, and the first inlet of the second shuttle valve is connected to the external pressure oil source through the second solenoid valve for turning on or blocking the external pressure oil source.

Wherein, the rope releasing hydraulic control system comprises a third motor, a third reversing valve and a third balancing valve group, the third reversing valve is connected to the oil pump, and the first port of the third motor is connected to the first outlet of the third reversing valve The second port of the third motor is connected to the second outlet of the third reversing valve via the third balancing valve block.

In order to solve the above technical problem, the present invention also discloses a rope collecting hydraulic control system, which The rope hydraulic control system comprises: an oil pump, the oil pump is connected with the system oil source; the first reversing valve, the first reversing valve is connected to the oil pump; the second reversing valve, the second reversing valve is connected to the oil pump; the collecting unit, the collecting unit The first pressure regulating valve group and the second pressure regulating valve group are included; the first motor, the first oil port of the first motor is connected to the first outlet of the first switching valve, and the second oil port of the first motor is simultaneously connected to the first a second outlet of the reversing valve and a first pressure regulating valve group; a second motor, a first port of the second motor is connected to the first outlet of the second reversing valve, and a second port of the second motor is simultaneously connected to the second port a second outlet of the reversing valve and a second pressure regulating valve group; a control unit for controlling the first reversing valve, the second reversing valve and the collecting unit.

Wherein, the first pressure regulating valve group includes a first proportional relief valve for setting the hydraulic pressure of the first motor, and the inlet of the first proportional relief valve is simultaneously connected to the second oil port of the first motor and the first commutation a second outlet of the valve, the outlet of the first proportional relief valve is connected back to the oil tank; the second pressure regulating valve group includes a second proportional relief valve for setting the hydraulic pressure of the second motor, and the second proportional relief valve The inlet simultaneously connects the second port of the second motor and the second port of the second reversing valve, and the outlet of the second proportional relief valve is connected back to the tank.

Wherein, the first pressure regulating valve group further comprises a first relief valve for protecting the first motor, the inlet of the first relief valve is connected to the inlet of the first proportional relief valve, and the outlet of the first relief valve is connected back to the fuel tank The second pressure regulating valve group further includes a second relief valve for protecting the second motor, an inlet of the second relief valve is connected to the inlet of the second proportional relief valve, and an outlet of the second relief valve is connected to the oil tank.

Wherein, the rope collecting hydraulic control system comprises a third motor, a third reversing valve and a third pressure regulating valve group, the third reversing valve is connected to the oil pump, and the first port of the third motor is connected to the first of the third reversing valve The second port of the third motor is simultaneously connected to the second outlet of the third reversing valve and the third pressure regulating valve group.

In order to solve the above technical problem, the present invention also discloses a crane comprising a first hoist, a second hoist, a first pulley block, a second pulley block and a boom, the root of the jib being movably connected to the crane, the first pulley block And the second pulley block is fixed on the crane, the crane further comprises a rope release hydraulic control system and/or a rope collecting hydraulic control system, and the rope releasing hydraulic control system is any of the above-mentioned rope releasing hydraulic control systems, Rope hydraulic control system is any of the above The rope collecting hydraulic control system, the first hoist is connected to the first motor, the second hoist is connected to the second motor, and the rope on the second hoist is fixed to the end of the arm near the root of the boom via the second pulley block, The rope on a winch is secured to the end of the boom away from the root of the boom via a first pulley block.

Wherein, the first reversing valve and the second reversing valve are three-position five-way solenoid valves.

The beneficial effects of the present invention are: Different from the prior art, the rope releasing hydraulic control system, the rope collecting hydraulic control system and the crane of the present invention can reliably retract the two 'winching machines by the cooperation of the two motors. Synchronize with the rope to achieve non-line, avoid the phenomenon of chaotic rope, facilitate the operator to debug, and save costs. DRAWINGS

1 is a schematic view showing the hydraulic principle of the hydraulic control system according to the first embodiment of the present invention; FIG. 2 is a schematic view showing the hydraulic principle of the hydraulic control system shown in FIG. 1 as a rope release hydraulic control system for rope laying;

Figure 3 is a schematic view showing the hydraulic principle of the hydraulic control system shown in Figure 1 as a rope collecting hydraulic control system for collecting rope;

4 is a schematic structural view of a lifting portion of a crane according to a second embodiment of the present invention; and FIG. 5 is a schematic view showing a hydraulic principle of a hydraulic control system according to a third embodiment of the present invention. detailed description

The invention will now be described in detail in conjunction with the drawings and embodiments.

Referring to Fig. 1, Fig. 1 is a schematic view showing the hydraulic principle of a hydraulic control system according to a first embodiment of the present invention.

The hydraulic control system 100 includes an oil pump 101, a first reversing valve 102, a second reversing valve 103, a first motor 106, a second motor 107, and a control unit (not shown). The control unit can be provided in any of the hydraulic control systems. Position, it has a variety of control methods, such as electrical signal control, hydraulic letter No. Control, manual control or a combination thereof. In the present embodiment, the hydraulic control system 100 preferably includes both the rope collecting unit 104 and the rope releasing unit 105, so that the hydraulic control system 100 can be used both as a rope collecting hydraulic control system and as a rope releasing hydraulic control system. In other embodiments, the hydraulic control system 100 may include only the rope collecting unit 104 or the rope releasing unit 105 such that the hydraulic control system 100 functions only as a rope receiving hydraulic control system or only as a rope release hydraulic control system.

The first reversing valve 102 has three working positions of left, middle and right. When the first reversing valve 102 is in the left position, the pressure port is connected to the B2 outlet, and the A2 outlet is connected to the oil tank 109; When the valve 102 is in the neutral position, the pressure port is blocked, and the A2 outlet and the B2 outlet are connected to the return tank 109; when the first reversing valve 102 is in the right position, the pressure port is connected to the A2 outlet, and the B2 outlet is connected to the return tank. 109. In the present embodiment, the first reversing valve 102 is in the neutral position by default.

The second reversing valve 103 also has three working positions of a left position, a middle position and a right position. Since the internal connection relationship corresponding to each working position of the second reversing valve 103 is the same as that of the first reversing valve 102, Let me repeat. In the present embodiment, the second reversing valve 103 is also in the neutral position by default.

Considering that the hydraulic control system 100 is different in the force of the first motor 106 and the second motor 107 in actual use, the design of the hydraulic control system 100 first analyzes the stress of the first motor 106 and the second motor 107. Then judge the active motor and the driven motor. Assuming that the tension of the first motor 106 is greater than the tension of the second motor 107, the first motor 106 is the active motor and the second motor 107 is the driven motor.

In the present embodiment, the first reversing valve 102 and the second reversing valve 103 are three-position five-way electromagnetic reversing valves. In other embodiments, the first reversing valve 102 and the second reversing valve 103 may be selected from other types of reversing valves, such as pilot hydraulic reversing valves.

Please refer to FIG. 2, which is a schematic diagram of the hydraulic principle of the hydraulic control system shown in FIG. 1 as a rope release hydraulic control system for rope laying.

When the hydraulic control system 100 functions as a rope release hydraulic control system, it includes an oil pump 101, a first reversing valve 102, a second reversing valve 103, a rope releasing unit 105, a first motor 106, a second motor 107, and a control unit. The rope releasing unit 105 includes a first balancing valve group and a second balancing valve group for regulating The oil flow rate of the rope release hydraulic control system. Wherein, the first balancing valve group includes a first shuttle valve 1051 and a first balancing valve 1052, and the second balancing valve group includes a second shuttle valve 1053 and a second balancing valve 1054. The control unit is for controlling the first reversing valve 102, the second reversing valve 103, and the rope releasing unit 105.

The inlet of the oil pump 101 is connected to the system oil source 108. The pressure port of the first reversing valve 102 is connected to the outlet of the oil pump 101, and the two oil return ports of the first reversing valve 102 are connected back to the oil tank 109. The A6 port of the first motor 106 is connected to the A2 outlet of the first reversing valve 102, and the B6 port of the first motor 106 is connected to the B2 outlet of the first reversing valve 102 via the first balancing valve block.

Specifically, the B6 port of the first motor 106 is connected to the outlet of the first balancing valve 1052, and the inlet of the first balancing valve 1052 is connected to the B2 outlet of the first switching valve 102, and the control port of the first balancing valve 1052 is connected. A motor 106 has an A6 port. In this embodiment, the spool of the first balancing valve 1052 has two states of one-way circulation and two-way throttle, and the initial state of the spool is one-way circulation, and the oil flow rate can only be from the first balancing valve. The inlet of the first balancing valve 1052 is unidirectionally circulated through the inlet of the first balancing valve 1052, and the hydraulic pressure of the control port of the first balancing valve 1052 can change the state of the spool of the first balancing valve 1052. The first inlet of the first shuttle valve 1051 is connected to the external pressure oil source P through the first solenoid valve 110 for turning on or blocking the external pressure oil source P, and the second inlet of the first shuttle valve 1051 is simultaneously connected to the first motor 106. The A6 port and the A2 outlet of the first reversing valve 102, the outlet of the first shuttle valve 1051 is connected to the control port of the first balancing valve 1052.

The pressure port of the second reversing valve 103 is also connected to the outlet of the oil pump 101, and the two oil return ports of the second reversing valve 103 are connected back to the oil tank 109. The A7 port of the second motor 107 is connected to the A3 outlet of the second reversing valve 103, and the B7 port of the second motor 107 is connected to the B3 outlet of the second reversing valve 103 via the second balancing valve block.

Specifically, the B7 port of the second motor 107 is connected to the outlet of the second balancing valve 1054, the inlet of the second balancing valve 1054 is connected to the B3 outlet of the second switching valve 103, and the control port of the second balancing valve 1054 is connected. The A7 port of the two motor 107. In this embodiment, the spool of the second balancing valve 1054 has two states of one-way circulation and two-way throttle, and the initial state of the spool is one-way circulation, and the oil flow rate can only be from the second balancing valve. The inlet of 1054 to the second balancing valve 1054 The port is unidirectionally circulated, and the hydraulic pressure of the control port of the second balancing valve 1054 can change the state of the spool of the second balancing valve 1054. The first inlet of the second shuttle valve 1053 is connected to the external pressure oil source P through the second solenoid valve 111 for turning on or blocking the external pressure oil source P, and the second inlet of the second shuttle valve 1053 is simultaneously connected to the second motor 107. The A7 port and the A3 outlet of the second reversing valve 103, and the outlet of the second shuttle valve 1053 are connected to the control port of the second balancing valve 1054.

The specific working principle of the rope releasing hydraulic control system of the present invention will be described below:

When the rope release hydraulic control system is not working, the first reversing valve 102 and the second reversing valve 103 are uncontrolled, and the first reversing valve 102 returns to the neutral position by default, for blocking the oil pump 101, the second exchange The valve 103 is returned to the neutral position by default to block the oil pump 101. The control unit controls the first solenoid valve 110 and the second solenoid valve 111 to block the external pressure oil source P;

When the rope release hydraulic control system performs the rope release, the control unit controls the first reversing valve 102 to make the first reversing valve 102 in the right position for turning on the oil pump 101, and controlling the first solenoid valve 110 to block the external pressure oil. The source P, the spool for controlling the first balancing valve 1052 is bidirectionally throttled. At this time, the outlet A2 of the first reversing valve 102 supplies oil to the A6 port of the first motor 106, and the first reversing valve 102 The B2 outlet drains the B6 port of the first motor 106 to cause the first motor 106 to actively rotate as the active motor; the second reversing valve 103 is uncontrolled and will return to the neutral position for blocking the oil pump 101, and controlling The unit controls the second solenoid valve 111 to open the external pressure oil source P for controlling the spool of the second balancing valve 1054 to be bidirectionally throttled. At this time, the A3 outlet of the second reversing valve 103 and the second reversing valve 103 The B3 outlet is simultaneously connected to the return tank 109 for circulating the oil of the second motor 107 to rotate the second motor 107 as a driven motor by an external force.

In this way, the first motor 106 actively lowers the heavy object through the external rope pulling device, and when the weight is lowered, the second motor 107 is rotated by the gravity of the heavy object, and the rope releasing process of the two motors will reach a nonlinear synchronization. Therefore, the ropes used for traction are all stressed and straightened to avoid the occurrence of chaotic ropes.

Please refer to FIG. 3. FIG. 3 is a schematic diagram of the hydraulic principle of the hydraulic control system shown in FIG. 1 as a rope collecting hydraulic control system for collecting rope. When the hydraulic control system 100 functions as a retracting hydraulic control system, it includes an oil pump 101, a first reversing valve 102, a second reversing valve 103, a rope collecting unit 104, a first motor 106, a second motor 107, and a control unit. The rope collecting unit 104 includes a first pressure regulating valve group and a second pressure regulating valve group for setting the hydraulic pressure of the rope collecting hydraulic control system. The first pressure regulating valve group includes a first proportional relief valve 1041 and a first relief valve 1042. The first proportional relief valve 1041 is used to set the hydraulic pressure of the first motor 106. The first relief valve 1042 is used. The first pressure regulating valve group includes a second proportional relief valve 1043 and a second relief valve 1043, and the second proportional relief valve 1043 is configured to set the hydraulic pressure of the second motor 107, the second The relief valve 1044 is used to protect the second motor 107. The control unit is for controlling the first reversing valve 102, the second reversing valve 103, and the collecting unit 104.

The inlet of the oil pump 101 is connected to the system oil source 108. The pressure port of the first reversing valve 102 is connected to the outlet of the oil pump 101, and the two oil return ports of the first reversing valve 102 are connected back to the oil tank 109. The A6 port of the first motor 106 is connected to the A2 outlet of the first reversing valve 102, and the B6 port of the first motor 106 is simultaneously connected to the B2 outlet of the first reversing valve 102 and the first pressure regulating valve group.

Specifically, the inlet of the first proportional relief valve 1041 is simultaneously connected to the B2 outlet of the first reversing valve 102 and the B6 port of the first motor 106, and the outlet of the first proportional relief valve 1041 is connected to the return tank 109. The inlet of the first relief valve 1042 is connected to the inlet of the first proportional relief valve 1041, and the outlet of the first relief valve 1042 is connected to the return tank 109. In the present embodiment, the first proportional relief valve 1041 is an electromagnetic proportional relief valve, and the first relief valve 1042 is a direct acting relief valve, which are connected in parallel. In other embodiments, only the first proportional relief valve 1041 can be accessed.

The pressure port of the second reversing valve 103 is connected to the outlet of the oil pump 101, the two oil return ports of the second reversing valve 103 are connected back to the oil tank 109, and the A7 port of the second motor 107 is connected to the A3 of the second reversing valve 103. Export. The B7 port of the second motor 107 is simultaneously connected to the B3 outlet of the second reversing valve 103 and the second pressure regulating valve group.

Specifically, the inlet of the second proportional relief valve 1043 is simultaneously connected to the B3 outlet of the second switching valve 103 and the B7 port of the second motor 107, and the outlet of the second proportional relief valve 1043 is connected to the return tank 109. The inlet of the second relief valve 1044 is connected to the inlet of the second proportional relief valve 1043, and the second overflow The outlet of the flow valve 1044 is connected back to the oil tank 109. In the present embodiment, the second proportional relief valve 1043 is an electromagnetic proportional relief valve, and the second relief valve 1044 is a direct acting relief valve, which are connected in parallel. In other embodiments, only the second proportional relief valve 1043 can be accessed.

The specific working principle of the rope collecting hydraulic control system of the present invention will be described below:

When the rope receiving hydraulic control system is not working, the first reversing valve 102 and the second reversing valve 103 are uncontrolled, and the first reversing valve 102 returns to the neutral position by default, for blocking the oil pump 101, the second exchange The valve 103 is returned to the neutral position by default to block the oil pump 101. The control unit controls the first solenoid valve 110 and the second solenoid valve 111 to block the external pressure oil source P;

When the rope collecting hydraulic control system performs the rope collection, the control unit controls the first switching valve 102 to be in the left position for turning on the oil pump 101, and controls the first electromagnetic valve 110 to block the external pressure oil source P for controlling the first The spool of the balancing valve 1052 returns to the initial state, that is, unidirectional circulation, and the control unit sets the first proportional relief valve 1041 to a high pressure overflow state. At this time, the B2 outlet of the first reversing valve 102 is the first motor. The B6 port of 106 is supplied with oil, and the A2 outlet of the first reversing valve 102 is drained from the A6 port of the first motor 106 to cause the first motor 106 to generate a large power as an active motor; the control unit controls the second commutation The valve 103 is in the left position for turning on the oil pump 101, and the control unit controls the second solenoid valve 111 to block the external pressure oil source P for controlling the spool of the second balancing valve 1054 to return to the one-way circulation state, and the control unit The second proportional relief valve 1043 is set to a low pressure relief state. At this time, the B3 outlet of the second switching valve 103 supplies oil to the B7 port of the second motor 107, and the A3 outlet of the second switching valve 103 is the The A7 port of the second motor 107 is drained to The second motor 107 as a driven motor produces less power.

Thus, the first motor 106 and the second motor 107 pull the weight through the external rope pulling device. As shown above, the first motor 106 is forced to be larger than the second motor 107, since the first motor 106 provides more power than the second motor 106. The motor 107, the rope collecting process of the two motors will reach a non-linear synchronization, so the ropes used for traction are forced to be straightened to avoid the occurrence of chaotic ropes.

Referring to FIG. 4, FIG. 4 is a schematic structural view of a lifting portion of a crane according to a second embodiment of the present invention. The lifting portion of the crane includes a boom 401, a first pulley block 402, a second pulley block 403, a first hoisting machine 406, and a second hoisting machine 407. In the present embodiment, the crane further includes the hydraulic control system (not shown) of the first embodiment for controlling the retracting rope action of the hoisting portion of the crane. In other embodiments, the crane may include only a rope release hydraulic control system or a rope collection hydraulic control system. The first hoisting machine 406 is connected to a first motor (not shown), the second hoisting machine 407 is connected to a second motor (not shown), the first hoisting machine 406 is wound with a cord 404, and the second hoisting machine 407 is wound with a cord 405. The root of the boom 401 is movably coupled to the crane, and the first pulley block 402 and the second pulley block 403 are both fixed to the crane. The rope 404 on the first hoisting machine 406 is fixed to one end of the boom 401 away from the root of the boom 401 via the first pulley block 402, and the rope 405 on the second hoisting machine 407 is fixed to the boom 401 via the second pulley block 403 near the boom Root of 401

1 and.

Since the position of the rope 404 and the sound 405 on the boom 401 is different, according to the analysis of the force condition, it is determined that the first motor is more stressed than the second motor, then the first motor is selected as the active motor, and the second motor is selected as Driven motor. When the boom 401 is required to be lowered, the first motor actively drives the first hoist to release the rope by the pressure of the hydraulic oil; the gravity of the boom 401 causes the second hoist to overcome the second motor because the first motor releases the rope and the boom 401 is lowered. The oil path resistance drives the second motor to rotate, thereby realizing the second winder to release the rope. Thus, both the rope 404 and the rope 405 are stretched, and no loose rope is generated;

When the boom 401 is required to be lifted, the first motor operates in a high pressure state and is subjected to a large load, and the active motor rotates to drive the first hoist to take up the rope; the second motor operates as a slave motor in a low pressure state, withstands a small load, and actively Rotate and drive the second hoist to take the rope. Thus, both the rope 404 and the rope 405 are stretched without causing a tangled rope.

In the present embodiment, the first motor is used as the active motor and the second motor is used as the driven motor depending on the force of the rope 404 being greater than the force of the rope 405. In other embodiments, the first motor can be used as the driven motor and the second motor can be used as the active motor according to the force of the rope 404 being smaller than the force of the rope 405. At this time, the control unit needs to change the parts of the hydraulic control system. Control, in view of control Control of the unit The first motor is a driven motor, and the control process of controlling the second motor to take the rope and the rope for the active motor is the same as that in the first embodiment, and therefore will not be described herein.

Since the control unit of the hydraulic control system controls the first motor and the second motor to simultaneously release the rope or simultaneously collect the rope, the hydraulic control system serves both as a rope collecting hydraulic control system and as a rope releasing hydraulic control system for collecting and releasing the rope. The process will be done on time and independently. It is worth noting that since the hydraulic control system may include a rope collecting unit and a rope releasing unit, or only one of them may be included, the crane should have only a lifting function or a function of only lowering.

In the above two embodiments, the rope collecting unit includes a first pressure regulating valve group and a second pressure regulating valve group for setting the hydraulic pressure of the hydraulic control system. The rope releasing unit includes a first balancing valve group and a second balancing valve group for regulating the oil flow rate of the hydraulic control system, and those skilled in the art can easily make different valves according to common knowledge in the art and the present invention. Other collecting and unwinding units assembled, and a hydraulic control system including the collecting unit and the rope releasing unit, and therefore the hydraulic control system should be equally included in the scope of the present invention.

Referring to FIG. 5, FIG. 5 is a schematic view showing the hydraulic principle of the hydraulic control system according to the third embodiment of the present invention.

The hydraulic control system includes, in addition to the first motor 501 and the second motor 502, a third motor 503, a third reversing valve, a third pressure regulating valve group, and a third balancing valve group, in addition to the first embodiment, The three reversing valve is connected to the oil pump, and the first port of the third motor 503 is connected to the first outlet of the third reversing valve.

Since the hydraulic control system can be used as both a rope release hydraulic control system and a rope collecting hydraulic control system, the second port of the third motor 503 of the rope release hydraulic control system is connected to the third directional control valve via the third balance valve group. The second outlet of the third motor 503 of the rope collecting hydraulic control system simultaneously connects the second outlet of the third switching valve and the third pressure regulating valve group. Since the specific connection relationship of the components of the hydraulic control system is the same as that of the first embodiment, it will not be described herein.

When the hydraulic control system is actually in use, the three motors work together, and each motor drives a hoist. When the hydraulic control system is working, it can be subjected to the rope on each hoist. The force situation is divided into an active motor or a driven motor. In the present embodiment, any one of the three motors can be used as the active motor, and the other two motors can be used as the driven motor. In other embodiments, any two of the three motors may be used as the active motor and the remaining one as the driven motor.

In the above three embodiments, the first embodiment includes two motors, the second embodiment includes two motors, and the third embodiment includes three motors. In other embodiments, the number of motors may vary with the number of winches. The increase and increase, and the active motor may be one or more, and the driven motor may be one or more, and those skilled in the art can easily fabricate a hydraulic pressure including a plurality of motors according to common knowledge in the art and the present invention. Control systems, and therefore hydraulic control systems containing other numbers of motors, are also included within the scope of the present invention.

In the above manner, the rope releasing hydraulic control system, the rope collecting hydraulic control system and the crane of the present invention can reliably realize the nonlinear synchronization of the rope collecting and the rope releasing of the two hoists by the cooperation of the two motors, thereby avoiding the occurrence of chaotic ropes. Phenomenon, convenient for operators to debug, saving costs.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the specification and the drawings of the present invention may be directly or indirectly applied to other related technologies. The scope of the invention is included in the scope of patent protection of the present invention.

Claims

Rights request

A rope release hydraulic control system, comprising:

An oil pump, wherein the oil pump is in communication with a system oil source;

a first reversing valve, the first reversing valve is connected to the oil pump;

a second reversing valve, the second reversing valve is connected to the oil pump;

a rope releasing unit, the rope releasing unit includes a first balancing valve group and a second balancing valve group; the first motor, the first oil port of the first motor is connected to the first outlet of the first switching valve, a second port of the first motor is connected to the second outlet of the first reversing valve via the first balancing valve group;

a second motor, a first port of the second motor is connected to the first outlet of the second reversing valve, and a second port of the second motor is connected to the second port via the second balancing valve group a second outlet of the reversing valve;

a control unit, the control unit is configured to control the first reversing valve, the second reversing valve, and the rope releasing unit.

2. The rope release hydraulic control system according to claim 1, wherein the first balance valve group includes a first balance valve, and the second port of the first motor is coupled to the first balance valve An outlet, connected to the second outlet of the first reversing valve via an inlet of the first balancing valve, the control port of the first balancing valve is connected to the first port of the first motor;

The second balancing valve group includes a second balancing valve, a second port of the second motor is connected to an outlet of the second balancing valve, and an inlet of the second balancing valve is connected to the second reversing valve a second outlet, the control port of the second balancing valve is connected to the first port of the second motor.

3 . The hydraulic control system for a rope release according to claim 2 , wherein the valve core of the first balancing valve has two states of one-way circulation and two-way throttle, and the spool of the first balancing valve The initial state is one-way circulation; The spool of the second balancing valve has two states of one-way circulation and two-way throttle, and the initial state of the spool of the second balancing valve is one-way circulation.

4. The rope release hydraulic control system according to claim 2, wherein the first balance valve group includes a first shuttle valve, and the first inlet of the first shuttle valve is connected to an external pressure oil source, a second inlet of the first shuttle valve is connected to the first oil port of the first motor, and an outlet of the first shuttle valve is connected to a control port of the first balancing valve;

The second balancing valve group includes a second shuttle valve, a first inlet of the second shuttle valve is connected to the external pressure oil source, and a second inlet of the second shuttle valve is connected to the first of the second motor The oil port, the outlet of the second shuttle valve is connected to the control port of the second balancing valve.

5 . The hydraulic control system for a rope release according to claim 4 , wherein the first balancing valve group is connected to a first electromagnetic valve, and the first inlet of the first shuttle valve passes through the first electromagnetic valve Connecting the external pressure oil source for turning on or blocking the external pressure oil source;

The second balancing valve group is connected with a second electromagnetic valve, and the first inlet of the second shuttle valve is connected to the external pressure oil source through the second electromagnetic valve for turning on or blocking the external pressure Oil source.

6. The rope release hydraulic control system according to claim 1, wherein the rope release hydraulic control system comprises a third motor, a third reversing valve and a third balancing valve group, the third reversing valve Connecting the oil pump, a first port of the third motor is connected to a first outlet of the third reversing valve, and a second port of the third motor is connected to the third balance valve group The second outlet of the three reversing valve.

7. A rope collecting hydraulic control system, comprising:

An oil pump, wherein the oil pump is in communication with a system oil source; a first reversing valve, the first reversing valve is connected to the oil pump;

a rope collecting unit, the rope collecting unit includes a first pressure regulating valve group and a second pressure regulating valve group; the first motor, the first oil port of the first motor is connected to the first outlet of the first switching valve The second port of the first motor is simultaneously connected to the second outlet of the first reversing valve and the first pressure regulating valve group;

a second motor, a first port of the second motor is connected to a first outlet of the second reversing valve, and a second port of the second motor is simultaneously connected to a second outlet of the second reversing valve And the second pressure regulating valve group;

a control unit, the control unit is configured to control the first reversing valve, the second reversing valve, and the collecting unit.

8. The rope collecting hydraulic control system according to claim 7, wherein the first pressure regulating valve group includes a first proportional relief valve for setting a hydraulic pressure of the first motor, The inlet of the first proportional relief valve is simultaneously connected to the second port of the first motor and the second outlet of the first reversing valve, and the outlet of the first proportional relief valve is connected back to the tank;

The second pressure regulating valve group includes a second proportional relief valve for setting a hydraulic pressure of the second motor, and an inlet of the second proportional relief valve simultaneously connects the second oil of the second motor And a second outlet of the second reversing valve, the outlet of the second proportional relief valve being connected to the return tank.

9. The rope collecting hydraulic control system according to claim 8, wherein the first pressure regulating valve group includes a first relief valve for protecting the first motor, the first relief valve The inlet of the first proportional relief valve is connected to the inlet of the first relief valve, and the outlet of the first relief valve is connected to the return tank;

The second pressure regulating valve group includes a second relief valve for protecting the second motor, and an inlet of the second relief valve is connected to an inlet of the second proportional relief valve, the second overflow Flow valve outlet Connect the return tank.

10. The rope collecting hydraulic control system according to claim 7, wherein the rope collecting hydraulic control system comprises a third motor, a third reversing valve and a third pressure regulating valve group, the third reversing valve a valve is connected to the oil pump, a first port of the third motor is connected to a first outlet of the third reversing valve, and a second port of the third motor is simultaneously connected to a third port of the third reversing valve Two outlets and the third pressure regulating valve group.

11. A crane comprising a first hoist, a second hoist, a first pulley block, a second pulley block and a boom, the root of the boom being movably coupled to the crane, the first pulley block and the second The pulley block is fixed to the crane, characterized in that the crane further comprises a rope release hydraulic control system and/or a rope collecting hydraulic control system, and the rope release hydraulic control system is according to any one of claims 1 to 6. The rope releasing hydraulic control system, the rope collecting hydraulic pressure control system is the rope collecting hydraulic pressure control system according to any one of claims 7 to 10, wherein the first hoisting machine connects the first motor, the second a hoist is coupled to the second motor, the rope on the second hoist is fixed to one end of the boom near the root of the boom via the second pulley block, and the rope on the first hoist passes the A first pulley block is secured to one end of the boom away from the root of the boom.

12. The crane according to claim 11, wherein the first reversing valve and the second reversing valve are three-position five-way solenoid valves.