A hydraulic drive device

Abstract

The present application provides a hydraulic drive device, which relates to the technical field of drive devices. The device includes a load-bearing member, a traction rope, a reset rope, a drive assembly and multiple guide pulleys, the guide pulleys are used to guide the extension direction of the traction rope and the reset rope; the drive assembly includes a pulley group, the pulley group includes a first fixed pulley group, a first movable pulley group, a second movable pulley group and a second fixed pulley group, the first movable pulley group and the second movable pulley are connected by a bracket, the traction rope is away from the load-bearing member at one end and alternately passes around the pulleys of the first fixed pulley group and the first movable pulley group, and the reset rope is away from the load-bearing member at one end and alternately passes around the pulleys of the second fixed pulley group and the second movable pulley group; the drive assembly also includes a propulsion cylinder and a buffer cylinder, the propulsion cylinder is used to drive the first movable pulley group and the second movable pulley group to move synchronously, thereby achieving high-speed acceleration of a large mass load.

Description

Technical Field

[0001] The present application relates to the technical field of drive devices, and in particular to a hydraulic drive device. Background Art

[0002] The hydraulic catapult system generally places the object to be accelerated on a trolley, and then uses a hydraulic motor to drive the reel to pull the wire rope to accelerate the trolley. After the object to be accelerated and the trolley are accelerated to the specified speed, the object to be accelerated can fly out.

[0003] At present, although hydraulic catapult systems are widely used in aerospace and other fields, they are limited by the speed of the hydraulic motor and the diameter of the drum, making it difficult to achieve high-speed acceleration of large mass loads. They can only be used to accelerate small objects to be accelerated, such as small drones. At the same time, the sudden reversal of the hydraulic motor for buffering will also produce a large impact, which can easily cause abnormalities in the hydraulic catapult system. Summary of the Invention

[0004] The present application provides a hydraulic drive device to solve the problem that the existing hydraulic ejection system is driven by a hydraulic motor, which makes it difficult to achieve high-speed acceleration of a large mass load, and the hydraulic motor suddenly reverses for buffering, which easily causes the hydraulic ejection system to malfunction.

[0005] In order to solve the above problems, this application adopts the following technical solutions:

[0006] The present application provides a hydraulic drive device, comprising a load-bearing member, a traction rope, a reset rope, a drive assembly, and a plurality of guide pulleys. The load-bearing member is used to support an object to be accelerated. The traction rope and the reset rope are provided on opposite sides of the load-bearing member to pull the load-bearing member to move. The guide pulleys are used to guide the extension directions of the traction rope and the reset rope to limit the movement direction of the load-bearing member.

[0007] The driving assembly includes at least one pulley group, the pulley group including a first fixed pulley group, a first movable pulley group, a second movable pulley group and a second fixed pulley group arranged in sequence along the moving direction of the bearing member, the first movable pulley group and the second movable pulley group are connected by a bracket, the first fixed pulley group, the first movable pulley group, the second movable pulley group and the second fixed pulley group each include at least two pulleys, the traction rope one end away from the bearing member alternately passes around the pulleys of the first fixed pulley group and the first movable pulley group, and the reset rope one end away from the bearing member alternately passes around the pulleys of the second fixed pulley group and the second movable pulley group;

[0008] The driving assembly also includes a propulsion cylinder and a buffer cylinder, both of which are connected to an oil supply system for supplying hydraulic oil. The propulsion cylinder and the buffer cylinder are arranged on opposite sides of the bracket to drive the first movable pulley group and the second movable pulley group to move synchronously toward or away from the first fixed pulley group.

[0009] In some possible designs, there are two pulley groups, which are arranged on both sides of the propulsion cylinder. One end of the traction rope is connected to the load-bearing member, and the other end is connected to the load-bearing member after passing through the first fixed pulley group and the first movable pulley group of the two pulley groups. One end of the reset rope is connected to the load-bearing member, and the other end is connected to the load-bearing member after passing through the second fixed pulley group and the second movable pulley group of the two pulley groups.

[0010] In some possible designs, the drive assembly further includes a tensioner, which is used to adjust the tension of the reset rope. The tensioner is located between the second fixed pulley sets of the two pulley sets. After the reset rope passes around one of the second fixed pulley sets of the two pulley sets, it passes around the tensioner and the other second fixed pulley set in sequence.

[0011] In some possible designs, the tensioner includes a tensioning cylinder, a first oil supply auxiliary component and a tensioning pulley, one end of the tensioning cylinder is rotatably connected to the tensioning pulley to drive the tensioning pulley to move back and forth along the moving direction of the carrier, and the tensioning cylinder is connected to the oil supply system through the first oil supply auxiliary component.

[0012] In some possible designs, the drive assembly further includes a damper, which is used to adjust the tension of the traction rope. The damper is located between the first fixed pulley sets of the two pulley sets. After the traction rope passes around one of the first fixed pulley sets of the two pulley sets, it passes around the damper and the other first fixed pulley set in sequence.

[0013] In some possible designs, the damper includes a balancing pulley, an adjustment mechanism, a second oil supply auxiliary component, and two damping cylinders. The balancing pulley is rotatably connected to the adjustment mechanism, and the adjustment mechanism is used to drive the balancing pulley to reciprocate along the moving direction of the carrier. The two damping cylinders are both connected to the oil supply system through the second oil supply auxiliary component, and the two damping cylinders are respectively arranged corresponding to the first fixed pulley groups of the two pulley groups. The balancing pulley is located at the end of the damping cylinder away from the first fixed pulley group.

[0014] In which, the traction rope includes a first connecting section, a second connecting section and a third connecting section, one end of the first connecting section is connected to the bearing member, and the other end is connected to the end of one of the damping cylinders after passing through one of the pulley groups, one end of the third connecting section is connected to the bearing member, and the other end is connected to the end of another of the damping cylinders after passing through another of the pulley groups, and the two ends of the second connecting section are respectively connected to the two damping cylinders away from one end of the first fixed pulley group after passing through the balancing pulley.

[0015] In some possible designs, the adjustment mechanism includes a screw and a driving member, the screw is rotationally connected to the balance pulley, and the driving member is used to engage with the screw to drive the screw to reciprocate along the moving direction of the supporting member.

[0016] In some possible designs, the first oil supply auxiliary component and the second oil supply auxiliary component both include a first one-way valve, a first accumulator, a reversing valve, a first overflow valve, and a damping valve connected in sequence, the damping valve is connected to the reversing valve, and the damping valve and the one-way valve are also connected to the tensioning cylinder or the damping cylinder so that the hydraulic oil in the first accumulator can enter the tensioning cylinder or the damping cylinder through the first one-way valve, and the first overflow valve and the first one-way valve are also connected to the oil supply system.

[0017] In some possible designs, the oil supply system includes an oil storage tank, a boost tank, a switching valve, an oil drain valve, a liquid filling valve, a launch main valve, at least one second accumulator and at least one gas cylinder, the propulsion cylinder is connected to the liquid filling valve and the launch main valve, the oil tank is connected to the oil drain valve, the launch main valve, the second accumulator and the switching valve, the launch main valve is also connected to the second accumulator, the top of the boost tank is connected to the gas cylinder, and the bottom of the boost tank is connected to the oil drain valve and the liquid filling valve.

[0018] In some possible designs, the oil supply system also includes a reset main valve, a two-way cartridge valve and at least one third accumulator, the buffer cylinder is connected to the reset main valve and the two-way cartridge valve, the oil tank is connected to the reset main valve, the third accumulator and the two-way cartridge valve, and the third accumulator is also connected to the reset main valve.

[0019] The hydraulic drive device provided by the present application can achieve high-speed acceleration of large mass loads, and the acceleration process is adjustable, and the impact generated by the buffering process is small. Specifically, the accelerated object is placed on the load-bearing member, and the traction rope and the reset rope are connected to the load-bearing member. When the accelerated object is accelerated, the propulsion cylinder is supplied with oil through the oil supply system, so that the first movable pulley group moves in the direction away from the first fixed pulley, and the second movable pulley group moves synchronously in the direction close to the second fixed pulley group, so that the load-bearing member is accelerated toward the side where it is connected to the traction rope, and the acceleration condition can be controlled by controlling the oil inlet speed of the propulsion cylinder. Adjustments are made. After accelerating to a predetermined speed, the propulsion cylinder is unloaded. Due to the inertia of each moving part, it will continue to move. At this time, the oil supply system builds up pressure for the buffer cylinder, thereby applying a reverse force to the carrier. The connection between the accelerated object and the carrier is automatically disconnected, and the accelerated object continues to move rapidly in the direction of departure and flies out. Other moving parts gradually slow down and move in the opposite direction under the action of the buffer cylinder until they return to their original position, preparing for the next acceleration. This reduces the impact of the buffering process while achieving high-speed acceleration of a large mass load, thereby playing a better protective role. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 A schematic structural diagram of a hydraulic drive device provided in an embodiment of the present application;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the tensioner;

[0023] Figure 3 for Figure 1 Schematic diagram of the connection structure between the second oil supply auxiliary component and the damping cylinder;

[0024] Figure 4 for Figure 1 Schematic diagram of the connection structure between the middle balance pulley and the adjustment mechanism;

[0025] Figure 5 for Figure 1 Schematic diagram of the hydraulic system.

[0026] Reference numerals:

[0027] 1-Traction rope, 2-Accelerated object, 3-Carrying member, 4-Reset rope, 5-Guide pulley, 6-Tensioner, 601-Tensioning support frame, 602-Tensioning pulley, 603-Tensioning cylinder, 604-First accumulator, 605-First one-way valve, 606-Reversing valve, 607-Damping valve, 608-First relief valve, 7-Buffer cylinder, 8-Second fixed pulley group, 9-Second movable pulley group, 10-First movable pulley group, 11-First fixed pulley group, 12-Propulsion Cylinder, 13-damping cylinder, 1401-balancing support frame, 1402-balancing pulley, 1403-driving part, 1404-screw, 15-boosting oil tank, 16-gas cylinder, 17-switch valve, 18-oil drain valve, 19-second one-way valve, 20-motor, 21-oil pump, 22-second overflow valve, 23-oil tank, 24-second accumulator, 25-launching main valve, 26-charging valve, 27-reset main valve, 28-third accumulator, 29-two-way cartridge valve.

[0028] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0029] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0030] Currently, hydraulic catapult systems primarily use hydraulic motors as actuators. However, this approach, limited by factors such as motor speed and drum diameter, cannot achieve high-speed acceleration of large payloads. It is generally only suitable for accelerating small drones and has a limited scope of application. Furthermore, when hydraulic motors are used as actuators, the sudden reversal of the hydraulic motor for buffering can also significantly impact the hydraulic catapult system.

[0031] While the combination of a hydraulic cylinder and a double-speed pulley can achieve high-speed acceleration of a large mass load, this approach, when used for buffering, can easily lead to buffering failure due to limitations in the back cavity area or piston cylinder strength if double-acting cylinder back cavity buffering is commonly used. Increasing the piston cylinder or its diameter will increase the volume and flow of the hydraulic cylinder. Of course, external buffering can also be used in the combination of a hydraulic cylinder and a double-speed pulley to avoid buffering failure, but external buffering has poor adjustability and produces a greater impact during the buffering process.

[0032] In order to avoid the above problems, the present application provides a hydraulic drive device, which drives the carrier to move through the cooperation of a traction rope, a reset rope, a propulsion cylinder and a buffer cylinder, thereby achieving high-speed acceleration of the accelerated object. The accelerated object can be a large mass load, and the scope of application is wide. At the same time, the buffer cylinder can perform overflow braking, the impact generated by the buffering process is small, and the reliability is high.

[0033] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0034] See Figure 1 As shown, this embodiment provides a hydraulic drive device, including a bearing member 3, a traction rope 1, a reset rope 4, a drive assembly and a guide pulley 5.

[0035] The load-bearing member 3 is used to support the accelerated object 2. It can be a common component such as a trolley or a zip line. This embodiment does not limit it as long as it can be used to carry the accelerated object 2 and automatically release the restraint on the accelerated object 2 when needed. The traction rope 1 and the reset rope 4 are arranged on opposite sides of the load-bearing member 3 to pull the load-bearing member 3 to move. The guide pulley 5 is used to guide the extension direction of the traction rope 1 and the reset rope 4 to limit the movement direction of the load-bearing member 3. It is understood that multiple guide pulleys 5 are provided, each located at a different position, to guide the traction rope 1 and the reset rope 4 so that they extend in the desired direction.

[0036] It is understandable that the traction rope 1 and the reset rope 4 can be steel ropes or other rope-like objects, as long as they can bear the tension generated during the acceleration of the accelerated object 2. This embodiment does not limit them.

[0037] The driving assembly includes at least one pulley group, which includes a first fixed pulley group 11, a first movable pulley group 10, a second movable pulley group 9 and a second fixed pulley group 8 arranged in sequence along the moving direction of the carrier 3. The first fixed pulley group 11, the first movable pulley group 10, the second movable pulley group 9 and the second fixed pulley group 8 each include at least two pulleys, that is, the first fixed pulley group 11, the first movable pulley group 10, the second movable pulley group 9 and the second fixed pulley group 8 are arranged side by side, and the arrangement direction of the pulleys in each pulley group is the same. At the same time, the first movable pulley group 10 and the second movable pulley group 9 are connected by a bracket, so that the first movable pulley group 10 and the second movable pulley group 9 move synchronously. Of course, the positions of the first fixed pulley group 11 and the second fixed pulley group 8 will not change. The end of the traction rope 1 away from the bearing member 3 alternately passes around the pulleys of the first fixed pulley group 11 and the first movable pulley group 10, that is, the traction rope 1 first passes around a pulley of the first fixed pulley group 11, then passes around a pulley in a certain first movable pulley group 10, and then passes around another pulley of the first fixed pulley group 11, and repeats this process until it completely passes around the pulleys of the first fixed pulley group 11 and the second fixed pulley group 8, and the reset rope 4 away from the bearing member 3 alternately passes around the pulleys of the second fixed pulley group 8 and the second movable pulley group 9. It can be understood that the connection method of the reset rope 4 to the second fixed pulley group 8 and the second movable pulley group 9 is the same as the connection method of the traction rope 1 to the first movable pulley group 10 and the first fixed pulley group 11.

[0038] It is understandable that the number of pulleys provided in the first fixed pulley set 11, the first movable pulley set 10, the second movable pulley set 9, and the second fixed pulley set 8 can be set as needed. For example, if each pulley set is provided with 6 pulleys, then the movement between the first movable pulley set 10 and the first fixed pulley set 11, and the movement between the second movable pulley set 9 and the second fixed pulley set 8 will be amplified to the support member 3 by a factor of 12. The specific number of pulleys provided in each pulley set can be varied, and this embodiment does not limit it. Of course, regardless of how the number of pulleys is varied, it is necessary to ensure that when the first movable pulley set 10 and the second movable pulley set 9 move synchronously, the length change of the traction rope 1 between the support member 3 and the first fixed pulley set 11 and the length change of the reset rope 4 between the support member 3 and the second fixed pulley set 8 match.

[0039] The driving assembly also includes a propulsion cylinder 12 and a buffer cylinder 7. The propulsion cylinder 12 and the buffer cylinder 7 are both connected to the oil supply system for supplying hydraulic oil. The propulsion cylinder 12 and the buffer cylinder 7 are arranged on opposite sides of the bracket to drive the first movable pulley group 10 and the second movable pulley group 9 to move synchronously toward or away from the first fixed pulley group 11, thereby driving the carrier 3 to move synchronously.

[0040] Among them, the main function of the oil supply system is to supply hydraulic oil to the buffer cylinder 7 and the propulsion cylinder 12, so as to control the moving direction and speed of the carrier 3 through the supply of hydraulic oil. The oil supply system can directly adopt the existing structure, and this embodiment does not limit it here.

[0041] When the object to be accelerated needs to be accelerated, the object to be accelerated is carried by the carrier 3. When the accelerated object 2 is accelerated, the propulsion cylinder 12 is supplied with oil through the oil supply system, so that the first movable pulley set 10 moves in the direction away from the first fixed pulley, and the second movable pulley set 9 moves synchronously in the direction close to the second fixed pulley set 8, so that the carrier 3 is accelerated toward the side connected to the traction rope 1. The acceleration condition can be adjusted by controlling the oil inlet speed of the propulsion cylinder 12, so that the acceleration process is adjustable. After accelerating to a predetermined speed, the propulsion cylinder 12 is unloaded. Due to the existence of various moving parts, the acceleration process is adjustable. During inertia, it will continue to move. At this time, the oil supply system builds up pressure for the buffer cylinder 7, thereby applying a reverse force to the carrier 3, and the speed gradually decreases. When the speed of the accelerated object 2 is greater than the speed of the carrier 3, the connection between the accelerated object 2 and the carrier 3 is automatically disconnected, so that the accelerated object 2 continues to move rapidly in the direction of departure and flies out. Other moving parts gradually slow down and move in the opposite direction under the action of the buffer cylinder 7 until they return to their original position, preparing for the next acceleration. This can reduce the impact caused by the buffering process while achieving high-speed acceleration of large mass loads, thereby playing a better protective role.

[0042] In some possible embodiments, two pulley sets are provided, and are disposed on either side of the propulsion cylinder 12. The two first movable pulley sets 10 and the two second movable pulley sets 9 are both connected to the bracket. When the bracket is driven to move by the propulsion cylinder 12 and the buffer cylinder 7, the two first movable pulley sets 10 and the two second movable pulley sets 9 will move synchronously with the bracket. Of course, the movement direction of the output ends of the propulsion cylinder 12 and the buffer cylinder 7 should be the same as the movement direction of the bearing member 3. Therefore, the first movable pulley set 10 and the first fixed pulley set 11 of the two pulley sets can be symmetrically disposed on either side of the propulsion cylinder 12, and the second movable pulley set 9 and the second fixed pulley set 8 of the two pulley sets can be symmetrically disposed on either side of the buffer cylinder 7.

[0043] One end of the traction rope 1 is connected to the bearing member 3, and the other end is connected to the bearing member 3 after passing through the first fixed pulley group 11 and the first movable pulley group 10 of the two pulley groups. One end of the reset rope 4 is connected to the bearing member 3, and the other end is connected to the bearing member 3 after passing through the second fixed pulley group 8 and the second movable pulley group 9 of the two pulley groups.

[0044] For example, Figure 1As shown, the guide pulleys 5 can be set to 8, and the traction rope 1 and the reset rope 4 each use 4 guide pulleys 5, and the guide pulleys 5 corresponding to the traction rope 1 and the reset rope 4 are symmetrically arranged on both sides of the pulley group, so that the 4 guide pulleys 5 are located at the four corners of a slightly smaller rectangle, and the other 4 guide pulleys 5 are located at the four corners of a slightly larger rectangle that is sleeved on the outside of the slightly smaller rectangle, so that the supporting member 3 can have two parts connected to the traction rope 1 and the reset rope 4 to better pull the supporting member 3 to move.

[0045] For some possible implementations, see Figure 2 As shown, the drive assembly also includes a tensioner 6, which is used to adjust the tension of the reset rope 4. The tensioner 6 is located between the second fixed pulley sets 8 of the two pulley sets. One end of the reset rope 4 is connected to the load-bearing member 3. The other end of the reset rope 4 passes around one of the second fixed pulley sets 8 of the two pulley sets, then passes around the tensioner 6 and the other second fixed pulley set 8 in sequence, before finally connecting to the load-bearing member 3. This arrangement allows the tension of the reset rope 4 to be dynamically adjusted during the acceleration of the accelerated object 2, balancing the tension at both ends of the reset rope 4, preventing the reset rope 4 from breaking due to uneven force at both ends, and also preventing the reset rope 4 from loosening.

[0046] Furthermore, the tensioner 6 includes a tensioning cylinder 603, a first oil supply auxiliary component and a tensioning pulley 602. One end of the tensioning cylinder 603 is rotatably connected to the tensioning pulley 602 to drive the tensioning pulley 602 to move back and forth along the moving direction of the carrier 3. The tensioning cylinder 603 is connected to the oil supply system through the first oil supply auxiliary component.

[0047] Specifically, the tensioning pulley 602 can be installed on a tensioning support frame 601, and the tensioning pulley 602 is rotatably connected to the tensioning support frame 601, while one end of the tensioning cylinder 603 is directly fixedly connected to the tensioning support frame 601, and the other end of the tensioning cylinder 603 is fixed, so that the tensioning cylinder 603 can drive the tensioning support and the tensioning pulley 602 to move back and forth along the extension direction of the tensioning cylinder 603. Of course, the extension direction of the tensioning cylinder 603 is the same as the moving direction of the carrier 3.

[0048] Illustratively, the piston rod of the tensioning oil cylinder 603 is connected to the tensioning support frame 601 , while the piston cylinder of the tensioning oil cylinder 603 is fixed, and the rodless chamber of the tensioning oil cylinder 603 is connected to the oil supply system.

[0049] It is understandable that the tensioning cylinder 603 can also be a piston cylinder connected to the tensioning support frame 601, with the piston rod end fixed, and the oil supply system directly connected to the rod cavity of the tensioning cylinder 603. This embodiment does not limit it here.

[0050] The first oil supply auxiliary component is used to connect to the oil supply system, adjust the oil supply speed, oil supply pressure, etc., so as to better control the operation of the tensioning cylinder 603.

[0051] Specifically, when the accelerated object 2 begins to accelerate, the thrust cylinder 12 is loaded, causing the tension of the traction rope 1 to suddenly increase. Due to the elastic elongation, the length of the traction rope 1 increases. The inconsistent length changes of the traction rope 1 and the reset rope 4 cause the reset rope 4 to tend to relax. At this time, the action of the tensioning cylinder 603 can ensure that the reset rope 4 will not relax and fall off.

[0052] When the accelerated object 2 is accelerated to a predetermined speed, the buffer cylinder 7 is loaded, causing the tension of the reset rope 4 to suddenly increase. At this time, the action of the tensioning cylinder 603 can not only provide sufficient support for the load of the reset rope 4, but also prevent the reset rope 4 from breaking due to the instantaneous excessive load.

[0053] For some possible implementations, see Figure 3 、 Figure 4 As shown, the drive assembly further includes a damper for adjusting the tension of the traction rope 1. The damper is located between the first fixed pulley sets 11 of the two pulley sets. One end of the traction rope 1 is connected to the load-bearing member 3, and the other end passes around one of the first fixed pulley sets 11 of the two pulley sets, then passes around the damper and the other first fixed pulley set 11 in sequence, and finally connects to the load-bearing member 3. This arrangement allows the tension of the traction rope 1 to be dynamically adjusted during the acceleration of the accelerated object 2, balancing the pulling forces at both ends of the traction rope 1, preventing the traction rope 1 from breaking due to uneven force at both ends, and also preventing the traction rope 1 from becoming loose due to deformation caused by strong pulling.

[0054] Furthermore, the damper includes a balancing pulley 1402, an adjusting mechanism, a second oil supply auxiliary component and two damping cylinders 13. The balancing pulley 1402 is rotatably connected to the adjusting mechanism. The adjusting mechanism is used to drive the balancing pulley 1402 to move back and forth along the moving direction of the carrier 3. The two damping cylinders 13 are both connected to the oil supply system through the second oil supply auxiliary component, and the two damping cylinders 13 are respectively arranged corresponding to the first fixed pulley group 11 of the two pulley groups. The balancing pulley 1402 is located at the end of the damping cylinder 13 away from the first fixed pulley group 11.

[0055] Among them, the traction rope 1 includes a first connecting section, a second connecting section and a third connecting section. One end of the first connecting section is connected to the supporting member 3, and the other end is connected to the end of a damping cylinder 13 after passing through the guide pulley 5, the first fixed pulley group 11 and the second fixed pulley group 8 of a pulley group. One end of the third connecting section is connected to the supporting member 3, and the other end is connected to the end of another damping cylinder 13 after passing through the first fixed pulley group 11 and the first movable pulley group 10 of another pulley group. After the second connecting section passes through the balancing pulley 1402, both ends are respectively connected to the two damping cylinders 13 away from the end of the first fixed pulley group 11.

[0056] Among them, the traction rope 1 is broken into two or three sections. When broken into two sections, the first connecting section and the third connecting section are still connected to one end of the supporting member 3, while the second connecting section is separated. This embodiment does not limit it here.

[0057] It can be understood that the damping cylinder 13 can be a piston cylinder connected to the second connecting section, a piston rod connected to the first connecting section or the third connecting section, or a piston cylinder connected to the first connecting section or the third connecting section, and a piston rod connected to the second connecting section. This embodiment does not limit this.

[0058] Specifically, when accelerating the object 2, the loading of the propulsion cylinder 12 causes a sudden increase in the tension of the traction rope 1. The damping cylinder 13 can withstand the corresponding tension through mechanical limiters, thereby protecting the wire rope. When the object 2 is accelerated to a predetermined speed, the loading of the buffer cylinder 7 causes a sudden increase in the tension of the reset wire rope. Due to elastic elongation, the length of the reset rope 4 increases, resulting in a mismatch between the lengths of the traction rope 1 and the reset rope 4, causing the traction rope 1 to tend to slack. At this time, the operation of the damping cylinder 13 ensures that the traction rope 1 does not slack or fall off.

[0059] The balancing pulley 1402 can balance the tension at both ends of the traction rope 1 to prevent the traction rope 1 from breaking due to uneven force at both ends. After long-term use, the wire rope will produce plastic elongation due to the force, causing the initial extension stroke of the tensioning cylinder 603 to be too long and the initial position of the support member 3 to be offset. At this time, the position of the balancing pulley 1402 is adjusted by the adjustment mechanism to compensate for the plastic elongation of the traction rope 1.

[0060] Furthermore, the adjustment mechanism includes a screw rod 1404 and a driving member 1403. The screw rod 1404 is rotatably connected to the balancing pulley 1402. The driving member 1403 is used to engage with the screw rod 1404 to drive the screw rod 1404 to reciprocate along the moving direction of the supporting member 3. Specifically, the driving member 1403 may include a gear and a motor 20, or a gear and a handwheel. The gear is engaged with the screw rod 1404, and the motor 20 or the handwheel drives the gear to rotate, thereby driving the screw rod 1404 to drive the balancing pulley 1402 to reciprocate along the moving direction of the supporting member 3, thereby effectively compensating for the plastic elongation of the traction rope 1.

[0061] It is understandable that the adjustment mechanism may also be a cylinder or other equipment, as long as it can effectively make the balancing pulley 1402 move back and forth along the moving direction of the supporting member 3, and this embodiment does not limit it here.

[0062] In addition, a balancing support frame 1401 can be set up, and the balancing pulley 1402 is rotatably connected to the balancing support frame 1401 and can rotate freely, while the screw rod 1404 is connected to the balancing support frame 1401, and under the action of the driving member 1403, the screw rod 1404 and the balancing support frame 1401 are driven to move back and forth along the moving direction of the supporting member 3.

[0063] For some possible implementations, see Figure 2 and Figure 3 As shown, the first oil supply auxiliary component and the second oil supply auxiliary component both include a first one-way valve 605, a first accumulator 604, a reversing valve 606, a first overflow valve 608, and a damping valve 607 connected in sequence. The damping valve 607 is connected to the reversing valve 606. The damping valve 607 and the one-way valve are also connected to the tensioning cylinder 603 or the damping cylinder 13, that is, the damping valve 607 and the first one-way valve 605 of the first oil supply auxiliary component are connected to the tensioning cylinder 603, and the damping valve 607 and the first one-way valve 605 of the second oil supply auxiliary component are connected to the damping cylinder 13, so that the hydraulic oil in the first accumulator 604 can enter the tensioning cylinder 603 or the damping cylinder 13 through the first one-way valve 605. The first overflow valve 608 and the first one-way valve 605 are also connected to the oil supply system.

[0064] The first relief valve 608 can reduce the pressure of the hydraulic oil provided by the oil supply system to a set value or overflow the working port pressure to a set value.

[0065] The oil supply system includes at least one oil tank 23 for storing hydraulic oil to effectively supply oil to the tensioning cylinder 603 and the damping cylinder 13 .

[0066] Specifically, for the tensioning cylinder 603:

[0067] Before accelerating the accelerated object 2, the hydraulic oil provided by the oil supply system charges the first accumulator 604 after passing through the first relief valve 608 and the reversing valve 606, and supplies oil to the tensioning cylinder 603 through the first one-way valve 605, so that the tensioning cylinder 603 provides initial tension to the reset rope 4 to prevent the reset rope 4 from loosening and falling off.

[0068] At the moment when the accelerated object 2 begins to accelerate, the lengths of the traction rope 1 and the reset rope 4 change inconsistently, causing the reset rope 4 to tend to slack. At this time, the hydraulic oil in the first accumulator 604 quickly enters the tensioning cylinder 603 through the first one-way valve 605, causing the piston rod of the tensioning cylinder 603 to quickly extend, and the bracket moves in a direction away from the second fixed pulley block 8, ensuring that the reset rope 4 does not slack or fall off.

[0069] When the accelerated object 2 is accelerated to a predetermined speed, the buffer cylinder 7 is loaded, causing the tension of the reset rope 4 to suddenly increase. At this time, the tensioning cylinder 603 passively retracts, and the hydraulic oil in the tensioning cylinder 603 returns to the first accumulator 604 through the damping valve 607 and the reversing valve 606. The damping valve 607 can increase the pressure when the tensioning cylinder 603 is passively retracted, ensuring that sufficient support is provided for the load of the reset rope 4 and preventing the reset rope 4 from being broken due to the instantaneous excessive load.

[0070] When all moving parts slow down to a stop, the tension of the reset rope 4 decreases back to the tensioning level, and the hydraulic oil in the first accumulator 604 flows into the tensioning cylinder 603 through the first one-way valve 605, causing the tensioning cylinder 603 to return to the equilibrium position.

[0071] In addition, after the hydraulic oil flows back to the first accumulator 604 through the damping valve 607, a large amount of heat will be generated, which will increase the oil temperature of the hydraulic oil. At this time, the electromagnet controlling the reversing valve 606 is energized, so that the hydraulic oil in the first accumulator 604 can flow back to the oil tank 23 through the reversing valve 606. The tensioning cylinder 603 can continue to maintain pressure and provide tensioning force due to the action of the first one-way valve 605. After the first accumulator 604 drains the hot oil, the electromagnet of the reversing valve 606 loses power. The hydraulic oil of the oil supply system enters the first overflow valve 608 and the reversing valve 606 to charge the first accumulator 604 and restore it to its initial state.

[0072] For the damping cylinder 13:

[0073] Before accelerating the accelerated object 2, the hydraulic oil provided by the oil supply system charges the first accumulator 604 after passing through the first relief valve 608 and the reversing valve 606, and at the same time supplies oil to the damping cylinder 13 through the first one-way valve 605. By adjusting the pressure, the pulling force of the damping cylinder 13 is made slightly smaller than the tension of the traction rope 1, so that the damping cylinder 13 reaches its maximum stroke.

[0074] When the accelerated object 2 begins to accelerate, the thrust cylinder 12 is loaded, causing the tension of the traction rope 1 to suddenly increase, and the damping cylinder 13 bears the corresponding tension through mechanical limiting.

[0075] When the accelerated object 2 is accelerated to a predetermined speed, the length changes of the traction rope 1 and the reset rope 4 are inconsistent, causing the traction rope 1 to have a tendency to relax. At this time, the hydraulic oil in the first accumulator 604 quickly flows into the damping cylinder 13 through the first one-way valve 605, causing the piston rod of the damping cylinder 13 to retract quickly, ensuring that the traction rope 1 will not relax and fall off.

[0076] After all moving parts slow down to a stop, the traction rope 1 restores the tension, pulling the piston rod of the damping cylinder 13 outward. The hydraulic oil in the damping cylinder 13 flows back to the first accumulator 604 through the damping valve 607, which generates a large amount of heat, causing the oil temperature of the hydraulic oil to rise. At this time, the electromagnet controlling the reversing valve 606 is energized, and the hydraulic oil in the first accumulator 604 flows back to the oil supply system through the reversing valve 606. After the first accumulator 604 drains the hot oil, the electromagnet of the reversing valve 606 loses power, and the hydraulic oil provided by the oil supply system passes through the first overflow valve 608 and the reversing valve 606 to charge the first accumulator 604 and restore it to its initial state.

[0077] In some possible embodiments, the oil supply system includes an oil storage tank 23, a boost tank 15, a charging valve 26, a launch main valve 25, at least one gas cylinder 16 and at least one second accumulator 24, the propulsion cylinder 12 is connected to the charging valve 26 and the launch main valve 25, the oil tank 23 is connected to the reset main valve 27, the launch main valve 25 and the switch valve 17, the launch main valve 25 is also connected to the second accumulator 24 and the charging valve 26, the top of the boost tank 15 is connected to the gas cylinder 16, and the bottom of the boost tank 15 is connected to the drain valve 18 and the charging valve 26. It can be understood that the various components are connected through pipelines for conveying hydraulic oil.

[0078] Among them, the filling valve 26 is installed at the bottom of the booster tank, which can achieve maximum oil replenishment, and the gas cylinder 16 is connected to the top of the booster tank 15, which can effectively replenish the pressure of the booster tank 15, ensuring that the booster tank 15 can meet the minimum pressure requirements after the hydraulic oil is replenished to the outside. Among them, the pressure of the booster tank 15 is generally maintained at 3-5 bar, and a hydraulic sensor is provided in the booster tank 15 to detect the hydraulic oil inventory in the booster tank 15 in real time, so as to replenish or transfer it in time.

[0079] In addition, when multiple gas cylinders 16 are set, each gas cylinder 16 is connected to the boost tank 15 through a pipeline, and the number of gas cylinders 16 can be set according to actual usage requirements, as long as the usage requirements of the boost tank 15 can be met. This embodiment does not limit it here.

[0080] It is understandable that multiple second accumulators 24 can also be provided to meet the acceleration requirements of the accelerated object 2. Of course, when multiple second accumulators 24 are provided, each second accumulator 24 is connected to the launch main valve 25 and the oil tank 23 through a pipeline. This embodiment does not limit the setting of the second accumulator 24.

[0081] Meanwhile, the structure and working principle of the accumulator are also well known to those skilled in the art, and will not be described in detail in this embodiment.

[0082] In some possible embodiments, the oil supply system also includes a reset main valve 27, a two-way cartridge valve 29 and at least one third accumulator 28, the buffer cylinder 7 is connected to the reset main valve 27 and the two-way cartridge valve 29, the oil tank 23 is connected to the reset main valve 27, the third accumulator 28 and the two-way cartridge valve 29, and the third accumulator 28 is also connected to the reset main valve 27.

[0083] Among them, multiple third accumulators 28 can be provided, and multiple third accumulators 28 are connected to the oil tank 23 and the reset main valve 27 through pipelines to ensure that the minimum pressure after reset meets the requirements, and the pressure in the third accumulator 28 should be much lower than the pressure in the second accumulator 24 when set. It can be understood that the number of third accumulators 28 can be selected according to actual needs, and this embodiment does not limit it here.

[0084] In addition, the two-way cartridge valve 29 is a new type of hydraulic control element, which is usually composed of an insert element, a pilot element, a control cover plate and a cartridge block. The two-way cartridge valve 29 can be controlled by the control cover plate to adjust the on and off of the liquid flow or the level of pressure, the size of the flow rate, etc. This is a device well known to those skilled in the art, and this embodiment will not be described in detail here. The two-way cartridge valve 29 is set in this embodiment to realize the electrical proportional adjustment of the cartridge valve inlet pressure, so as to better control the buffer cylinder 7.

[0085] It can be understood that in order to ensure the oil supply pressure to the thrust cylinder 12 and the buffer cylinder 7, taking the thrust cylinder 12 side as an example, a plurality of pump groups consisting of a motor 20, a second one-way valve 19, an oil pump 21 and a second overflow valve 22 can be arranged on the pipeline connected to the oil tank 23, that is, the oil inlet of the second accumulator 24, the switch valve 17 and the launch main valve 25 are connected through a pipeline, and the pipeline is connected to the second one-way valve 19, so that the oil in the oil tank 23 can only enter the switch valve 17, the launch main valve 25 and the second accumulator 24 through the one-way valve under the action of the oil pump 21.

[0086] It can be understood that when multiple pump groups are provided, the multiple pump groups are provided in parallel between the oil tank 23 and the pipeline connecting the second accumulator 24, the switch valve 17, and the oil inlet of the launch main valve 25, and for each pump group, the second overflow valve 22 and the oil pump 21 are provided in parallel between the second one-way valve 19 and the oil tank 23, so that the requirements of the drive device for the hydraulic oil flow can be met in this way.

[0087] The buffer oil cylinder 7 is also arranged in the same manner, that is, the accumulator and the oil inlet of the reset main valve 27 are connected through a pipeline, and a pump group is arranged on the pipeline in the same manner.

[0088] In addition, the specific number of pump groups is determined based on actual conditions and is not described in detail in this embodiment. The fuel tank 23 may be provided in one or more configurations, and the buffer cylinder 7 and the propulsion cylinder 12 may use the same fuel tank 23 or different fuel tanks 23, which are not limited in this embodiment.

[0089] For ease of understanding, the working principle of the hydraulic drive device provided in the embodiment of the present application is further explained below:

[0090] For the propulsion cylinder 12 and the buffer cylinder 7, Figure 1 As shown, after the accelerated object 2 is connected to the carrier 3 by means of a hook or the like, oil is introduced into the propulsion cylinder 12 to generate a thrust to the right (on the side where the carrier 3 is connected to the reset rope 4), and the piston rod of the propulsion cylinder 12 extends, driving the piston rods of the second movable pulley set 9, the first movable pulley set 10 and the buffer cylinder 7 to move to the right, wherein the buffer cylinder 7 is passively retracted. At this time, the distance between the first movable pulley set 10 and the first fixed pulley set 11 increases, and the traction rope 1 is retracted at a multiple distance, pulling the accelerated object 2 and the carrier 3 to accelerate to the left, while the distance between the second movable pulley set 9 and the second fixed pulley set 8 decreases, and the reset rope 4 is released at a multiple rate, as the accelerated object 2 and the carrier 3 accelerate to the left.

[0091] When the accelerated object 2 is accelerated to a predetermined speed, the propulsion cylinder 12 stops supplying oil. Due to the inertia of the moving parts, the second movable pulley set 9, the first movable pulley set 10, the piston rod of the propulsion cylinder 12 and the piston rod of the buffer cylinder 7 continue to move to the right. At this time, the buffer cylinder 7 supplies oil to generate a leftward thrust, causing the support member 3 and other moving parts of the hydraulic drive device to gradually decelerate. The connection between the accelerated object 2 and the support member 3 is automatically disengaged, and the accelerated object 2 continues to move rapidly to the left and flies out, while the moving parts of the hydraulic drive device continue to decelerate until they stop.

[0092] Each moving part continues to decelerate until it stops and then the system resets. The buffer cylinder 7 is filled with oil to generate a left thrust. The piston rod of the buffer cylinder 7 extends, driving the second movable pulley set 9, the first movable pulley set 10 and the piston rod of the propulsion cylinder 12 to move to the left. Among them, the propulsion cylinder 12 is passively retracted. After the propulsion cylinder 12 is fully retracted, the hydraulic drive device returns to its initial state and prepares for the next acceleration.

[0093] As for the oil supply system, Figure 5 As shown, before accelerating the accelerated object 2, each pump group is started first to charge the second accumulator 24 and the third accumulator 28. At this time, the oil discharge valve 18 is in the left position and is fully closed. The switch valve 17 is in the right position so that the filling valve 26 controls the oil port and is connected to the oil tank 23. The filling valve 26 is not actively opened. The launch main valve 25 is in the left position and is fully closed. The reset main valve 27 is in the left position and is fully closed. The oil inlet side pressure of the two-way cartridge valve 29 is set to 0.

[0094] When the accelerated object 2 starts to accelerate, the launch main valve 25 opens, and the hydraulic oil in the pump group and the second accumulator 24 enters the propulsion cylinder 12 through the launch main valve 25, and generates a rightward thrust. The buffer cylinder 7 is passively retracted, and the hydraulic oil in the buffer cylinder 7 flows back to the oil tank 23 through the two-way cartridge valve 29. At this time, the oil inlet side pressure of the two-way cartridge valve 29 is still set to 0.

[0095] When the accelerated object 2 is accelerated to a predetermined speed, the launch main valve 25 is closed, and the hydraulic oil in the pump group and the second accumulator 24 is no longer sent to the propulsion cylinder 12. The rightward thrust disappears, and the hydraulic oil in the booster tank 15 enters the propulsion cylinder 12 through the filling valve 26 to replenish oil to prevent air from being sucked in. At this time, the pressure on the right side of the two-way cartridge valve 29 increases, and the pressure in the buffer cylinder 7 increases accordingly to generate a leftward thrust, causing the moving parts to gradually slow down until they stop.

[0096] During the reset process, the switch valve 17 is in the left position, so that the charging valve 26 control oil port is disconnected from the oil tank 23, the charging valve 26 is actively opened, the launch main valve 25 is in the left position and fully closed, the two-way cartridge valve 29 remains loaded, the reset main valve 27 is opened, and the hydraulic oil in the pump group and the third accumulator 28 enters the buffer cylinder 7 through the reset main valve 27 and generates a left thrust, the propulsion cylinder 12 is passively retracted, and the hydraulic oil in the propulsion cylinder 12 flows into the boost tank 15 through the charging valve 26. A liquid level detector is installed in the boost tank 15. When the liquid level of the boost tank 15 is below the specified height, the drain valve 18 is fully closed. When the liquid level of the boost tank 15 is higher than the specified height, the drain valve 18 is opened to discharge the excess hydraulic oil into the oil tank 23. After the propulsion cylinder 12 is fully retracted, the hydraulic drive device returns to its initial state and prepares for the next acceleration.

[0097] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0098] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A hydraulic drive device, characterized in that: The invention comprises a bearing member (3), a traction rope (1), a reset rope (4), a driving assembly and a plurality of guide pulleys (5), wherein the bearing member (3) is used to support an accelerated object (2), the traction rope (1) and the reset rope (4) are arranged on opposite sides of the bearing member (3) to pull the bearing member (3) to move, and the guide pulleys (5) are used to guide the extension direction of the traction rope (1) and the reset rope (4) to limit the moving direction of the bearing member (3); The driving assembly includes at least one pulley group, the pulley group includes a first fixed pulley group (11), a first movable pulley group (10), a second movable pulley group (9) and a second fixed pulley group (8) arranged in sequence along the moving direction of the carrier (3), the first movable pulley group (10) and the second movable pulley group (9) are connected by a bracket, the first fixed pulley group (11), the first movable pulley group (10), the second movable pulley group (9) and the second fixed pulley group (8) each include at least two pulleys, the end of the traction rope (1) away from the carrier (3) alternately passes around the pulleys of the first fixed pulley group (11) and the first movable pulley group (10), and the end of the reset rope (4) away from the carrier (3) alternately passes around the pulleys of the second fixed pulley group (8) and the second movable pulley group (9); The driving assembly further comprises a propulsion cylinder (12) and a buffer cylinder (7), wherein the propulsion cylinder (12) and the buffer cylinder (7) are both connected to an oil supply system for supplying hydraulic oil, and the propulsion cylinder (12) and the buffer cylinder (7) are respectively arranged on opposite sides of the bracket to drive the first movable pulley group (10) and the second movable pulley group (9) to move synchronously toward or away from the first fixed pulley group (11); Two pulley groups are provided and are respectively arranged on both sides of the propulsion cylinder (12); one end of the traction rope (1) is connected to the bearing member (3), and the other end is connected to the bearing member (3) after passing through the first fixed pulley group (11) and the first movable pulley group (10) of the two pulley groups; one end of the reset rope (4) is connected to the bearing member (3), and the other end is connected to the bearing member (3) after passing through the second fixed pulley group (8) and the second movable pulley group (9) of the two pulley groups; The driving assembly further comprises a tensioner (6) for adjusting the tension of the reset rope (4). The tensioner (6) is located between the second fixed pulley sets (8) of the two pulley sets. After the reset rope (4) passes around one of the second fixed pulley sets (8) of the two pulley sets, it passes around the tensioner (6) and the other second fixed pulley set (8) in sequence. The tensioner (6) comprises a tensioning oil cylinder (603), a first oil supply auxiliary component and a tensioning pulley (602); one end of the tensioning oil cylinder (603) is rotatably connected to the tensioning pulley (602) to drive the tensioning pulley (602) to move back and forth along the moving direction of the supporting component (3); and the tensioning oil cylinder (603) is connected to the oil supply system via the first oil supply auxiliary component.

2. The hydraulic drive device according to claim 1, characterized in that: The driving assembly further comprises a damper, which is used to adjust the tension of the traction rope (1). The damper is located between the first fixed pulley sets (11) of the two pulley sets. After the traction rope (1) passes around one of the first fixed pulley sets (11) of the two pulley sets, it passes around the damper and the other first fixed pulley set (11) in sequence.

3. The hydraulic drive device according to claim 2, characterized in that: The damper comprises a balancing pulley (1402), an adjusting mechanism, a second oil supply auxiliary component and two damping oil cylinders (13); the balancing pulley (1402) is rotatably connected to the adjusting mechanism; the adjusting mechanism is used to drive the balancing pulley (1402) to reciprocate along the moving direction of the bearing member (3); the two damping oil cylinders (13) are connected to the oil supply system through the second oil supply auxiliary component, and the two damping oil cylinders (13) are respectively arranged corresponding to the first fixed pulley groups (11) of the two pulley groups; the balancing pulley (1402) is located at one end of the damping oil cylinder (13) away from the first fixed pulley group (11); Wherein, the traction rope (1) includes a first connecting section, a second connecting section and a third connecting section, one end of the first connecting section is connected to the bearing member (3), and the other end is connected to the end of one of the damping cylinders (13) after passing through one of the pulley groups, one end of the third connecting section is connected to the bearing member (3), and the other end is connected to the end of another of the damping cylinders (13) after passing through another of the pulley groups, and the two ends of the second connecting section are respectively connected to the ends of the two damping cylinders (13) away from the first fixed pulley group (11) after passing through the balancing pulley (1402).

4. The hydraulic drive device according to claim 3, characterized in that: The adjusting mechanism comprises a screw rod (1404) and a driving member (1403), wherein the screw rod (1404) is rotationally connected to the balancing pulley (1402), and the driving member (1403) is used to engage with the screw rod (1404) to drive the screw rod (1404) to move back and forth along the moving direction of the supporting member (3).

5. The hydraulic drive device according to claim 3, characterized in that: The first oil supply auxiliary component and the second oil supply auxiliary component both include a first one-way valve (605), a first accumulator (604), a reversing valve (606), a first overflow valve (608), and a damping valve (607) connected in sequence. The damping valve (607) is connected to the reversing valve (606). The damping valve (607) and the first one-way valve are also connected to the tensioning cylinder (603) or the damping cylinder (13) so that the hydraulic oil in the first accumulator (604) can enter the tensioning cylinder (603) or the damping cylinder (13) through the first one-way valve (605). The first overflow valve (608) and the first one-way valve (605) are also connected to the oil supply system.

6. The hydraulic drive device according to any one of claims 1 to 5, characterized in that: The oil supply system comprises an oil storage tank (23), a boosting oil tank (15), a switch valve (17), an oil discharge valve (18), a liquid filling valve (26), a launch main valve (25), at least one second accumulator (24) and at least one gas cylinder (16); the propulsion oil cylinder (12) is connected to the liquid filling valve (26) and the launch main valve (25); the oil storage tank (23) is connected to the oil discharge valve (18), the launch main valve (25), the second accumulator (24) and the switch valve (17); the launch main valve (25) is also connected to the second accumulator (24); the top of the boosting oil tank (15) is connected to the gas cylinder (16); and the bottom of the boosting oil tank (15) is connected to the oil discharge valve (18) and the liquid filling valve (26).

7. The hydraulic drive device according to claim 6, characterized in that: The oil supply system further comprises a reset main valve (27), a two-way cartridge valve (29) and at least one third accumulator (28); the buffer oil cylinder (7) is connected to the reset main valve (27) and the two-way cartridge valve (29); the oil tank (23) is connected to the reset main valve (27), the third accumulator (28) and the two-way cartridge valve (29); and the third accumulator (28) is also connected to the reset main valve (27).

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