Cylinder pin, cargo boom and crane

Abstract

The invention relates to the technical field of cranes, and discloses a cylinder pin, a cargo boom and a crane, and the cylinder pin comprises a cylinder pin body, a first buffer piece and a first buffer mechanism. The cylinder pin body is suitable for being telescopically connected to the cylinder head and suitable for extending into the cylinder pin hole. The first abutting piece is slidably connected with the cylinder pin body and can slide in the telescopic direction of the cargo boom, and the first abutting piece is suitable for abutting against the hole wall of the cylinder pin hole in the extending direction of the cargo boom. The first buffering mechanism is connected with the first abutting piece, and the buffering mechanism is suitable for providing buffering force for the first abutting piece in the extending direction of the cargo boom. When a certain arm section of the cargo boom is retracted, the first abutting piece abuts against the side wall of the cylinder pin hole firstly, and then the side wall of the cylinder pin hole makes contact with the cylinder pin body. In the sliding process of the first abutting piece, the first buffering structure provides buffering force for the first abutting piece, so that the first abutting piece can slide slowly, the impact force of the front side wall of the cylinder pin hole on the front side portion of the cylinder pin body is weakened, and abnormal sound is weakened.

Description

Technical Field

[0001] The present application relates to the technical field of cranes, and in particular to a cylinder pin, a lifting arm and a crane. Background Art

[0002] A crane is a mechanical device used for vertical lifting and horizontal transport of heavy objects. The boom is the core component of a crane, used to support the lifting load and achieve the lifting and horizontal movement of cargo. The single-cylinder latch-type boom is the most widely used. It consists of a cylinder head, multiple boom sections, and an arm pin structure. Each boom section is provided with an arm pin and multiple arm pin holes. Between two adjacent boom sections, the arm pin of one is inserted into the arm pin hole of the other to connect the two boom sections. If the arm pin is disengaged from the arm pin hole, the two boom sections are disconnected. The cylinder head is provided with an arm pin unlocking device and a retractable cylinder pin. The boom section is provided with a cylinder pin hole. The cylinder head can move in the direction of extension and retraction of the boom. When the cylinder pin is inserted into the cylinder pin hole, the movement of the cylinder head can push the boom section to extend and retract. The arm pin unlocking device is used to disengage the arm pin from the arm pin hole. There is a gap between the front and rear sides of the cylinder pin and the wall of the cylinder pin hole, and there is a gap between the arm pin and the arm pin hole.

[0003] When retracting a boom section, the cylinder pin is inserted into the cylinder pin hole on that section, and then the cylinder head is moved in the retracting direction of the telescopic boom until the rear side of the cylinder pin contacts the rear side of the cylinder pin hole. The cylinder pin then begins to pull the boom section back. Because the boom has different elevation angles under different working conditions and there are manufacturing errors in the boom sections, the friction between adjacent boom sections may be too large, requiring the cylinder head to provide a greater force to pull. This generates greater kinetic energy when the boom section is pulled, and combined with the boom section's own gravity, the boom section retracts faster than the cylinder head, causing the front side wall of the cylinder pin hole to collide significantly with the front side of the cylinder pin, generating abnormal noise.

[0004] Therefore, how to solve or improve the problem in the related art that the cylinder pin and the hole wall of the cylinder pin hole produce a large collision and abnormal noise has become an important technical problem that technicians in this field need to solve. Summary of the Invention

[0005] In view of this, the present application provides a cylinder pin, a lifting arm and a crane to solve or improve the problem of the cylinder pin and the hole wall of the cylinder pin hole having a large impact and generating abnormal noise.

[0006] In a first aspect, the present application provides a cylinder pin, comprising:

[0007] The cylinder pin body is adapted to be telescopically connected to the cylinder head and adapted to extend into the cylinder pin hole;

[0008] a first abutment member slidably connected to the cylinder pin body and capable of sliding along the extension direction of the boom, wherein the first abutment member is adapted to abut against the wall of the cylinder pin hole along the extension direction of the boom;

[0009] The first buffer mechanism is connected to the first abutment member. In the extension direction of the boom, the first buffer structure is suitable for providing a buffer force for the first abutment member.

[0010] In an optional embodiment, a sliding hole is provided on the cylinder pin body along the extension and retraction direction of the boom;

[0011] The first abutment member includes a slider and an abutment rod, the slider is slidably connected to the slide hole and separates the interior of the slide hole, one end of the abutment rod is connected to the slider, and the other end is suitable for abutting against the hole wall of the cylinder pin hole, and the side of the slider facing away from the abutment rod forms a first flow cavity with the inner wall of the slide hole;

[0012] The first buffer mechanism includes a balancing valve. The first flow chamber is communicated with the balancing valve through a fluid channel. The balancing valve is adapted to provide back pressure for a side of the slider facing away from the abutting rod.

[0013] In an optional embodiment, the method further includes:

[0014] a connecting member, at least partially inserted into the sliding hole, and the abutting rod slidably passing through the connecting member;

[0015] The first elastic member is connected between the connecting member and the slider. Under the elastic force of the first elastic member, the slider tends to slide away from the connecting member. The balancing valve is an adjustable balancing valve.

[0016] In an optional embodiment, the method further includes:

[0017] The sealing member is at least partially inserted into the sliding hole, the abutment rod is slidably provided in the sealing member, the side of the slider away from the sealing member forms the first flow cavity, and the side of the slider close to the sealing member forms the second flow cavity.

[0018] In an optional embodiment, the first buffer mechanism includes a second elastic member, and the first abutment member is connected to the cylinder pin body through the second elastic member. Under the elastic force of the second elastic member, the first abutment member tends to slide along the extension direction of the boom.

[0019] In an optional embodiment, the method further includes:

[0020] A driving assembly is connected to the cylinder pin body and is suitable for driving the first abutment member to slide along the retraction direction of the boom.

[0021] In an optional embodiment, the method further includes:

[0022] a second abutment member slidably connected to the cylinder pin body and capable of sliding along the extension direction of the boom, wherein the second abutment member is adapted to abut against the wall of the cylinder pin hole along the retraction direction of the boom;

[0023] The second buffer mechanism is connected to the second abutting member. In the retracting direction of the boom, the buffer structure is suitable for providing a buffer force for the second abutting member.

[0024] In a second aspect, the present application also provides a lifting arm comprising any of the cylinder pins described above.

[0025] In an optional embodiment, the method further includes:

[0026] A plurality of arm sections are sequentially sleeved, and any two adjacent arm sections can slide relative to each other to extend or retract the boom. Each arm section is telescopically provided with an arm pin, each arm section is provided with an arm pin hole, and each arm section is provided with a cylinder pin hole.

[0027] The cylinder head is slidably connected to the first arm section and can slide along the telescopic direction of the lifting arm. The cylinder pin is telescopically arranged on the cylinder head. The cylinder pin is suitable for extending into the cylinder pin hole. The cylinder head is provided with a pin pulling device for retracting the arm pin.

[0028] In a third aspect, the present application also provides a crane comprising any of the cylinder pins or booms described above.

[0029] The present application provides a cylinder pin, wherein the cylinder pin body is adapted to be telescopically connected to the cylinder head and adapted to extend into the cylinder pin hole. A first abutment is slidably connected to the cylinder pin body and can slide along the extension direction of the boom. The first abutment is adapted to abut against the wall of the cylinder pin hole along the extension direction of the boom. A first buffer mechanism is connected to the first abutment, and the buffer structure is adapted to provide a buffering force for the first abutment in the extension direction of the boom.

[0030] When retracting a certain arm section of the boom, if the friction between it and the adjacent arm section is too large, resulting in a large kinetic energy when the arm section is pulled, the arm section retracts faster than the cylinder head. When the arm section retracts, the first abutment first abuts against the side wall of the cylinder pin hole along the extension direction of the boom. Then the first abutment is pushed to slide along the retraction direction of the boom until the side wall of the cylinder pin hole contacts the cylinder pin body again after the first abutment moves a certain distance. Since the first buffer structure provides a buffering force for the first abutment during the sliding of the first abutment along the retraction direction of the boom, the first abutment can slide relatively slowly, buffering the retraction action of the arm section, thereby reducing the impact force of the front side wall of the cylinder pin hole on the front side of the cylinder pin body and reducing abnormal noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of this application or the technical solutions in related technologies, the following is a brief introduction to the drawings required for use in the specific implementation methods or related technical descriptions. Obviously, the drawings described below are some implementation methods of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 This is a schematic structural diagram of a cylinder pin according to an embodiment of the present application;

[0033] Figure 2 This is a schematic structural diagram of a crane arm according to an embodiment of the present application;

[0034] Figure 3 This is a schematic diagram of the arm section structure of a crane arm according to an embodiment of the present application;

[0035] Figure 4 This is a schematic structural diagram of a cylinder head of a lifting arm according to an embodiment of the present application;

[0036] Figure 5 A partially cutaway schematic diagram of a cylinder head of a lifting arm according to an embodiment of the present application;

[0037] Figure 6 Schematic diagram of the front side portion of the cylinder pin body abutting against the front side wall of the cylinder pin hole in the embodiment of the present application;

[0038] Figure 7 This is a schematic diagram of the cylinder pin body and the front and rear side walls of the cylinder pin hole being spaced apart in the embodiment of the present application;

[0039] Figure 8 A schematic diagram showing the rear side of the cylinder pin body abutting against the rear side wall of the cylinder pin hole in an embodiment of the present application;

[0040] Figure 9 Schematic diagram of the front side portion of the arm pin abutting against the front side wall of the arm pin hole in an embodiment of the present application;

[0041] Figure 10 This is a schematic diagram of the rear side of the arm pin abutting against the rear side wall of the arm pin hole in an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 1. Cylinder pin body; 11. Sliding hole; 111. First cavity; 12. Fluid channel; 2. First abutment member; 21. Sliding block; 22. Abutment rod; 3. Connecting member; 4. First elastic member; 5. Arm section; 51. Arm pin; 52. Arm pin hole; 53. Cylinder pin hole; 6. Cylinder head; 61. Pin pulling device. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0045] The following combination Figures 1 to 10 , describing the embodiments of the present application.

[0046] According to an embodiment of the present application, on the one hand, a cylinder pin is provided, comprising a cylinder pin body 1, a first abutment member 2, and a first buffer mechanism. In a lifting arm, the cylinder pin body 1 is telescopically connected to a cylinder head 6, so that when the cylinder head 6 moves to a position between the cylinder pin body 1 and a cylinder pin hole 53 of a certain arm section 5, the cylinder pin body 1 can extend into the cylinder pin hole 53, so that the movement of the cylinder head 6 can drive the arm section 5 to slide and telescope together.

[0047] The first abutment 2 is slidably connected to the cylinder pin body 1, so that the first abutment 2 can slide along the telescopic direction of the boom. The telescopic direction of the boom includes the extension direction X and the retraction direction Y of the boom. The first abutment 2 can extend from the front side of the cylinder pin body 1 along the extension direction X of the boom, so that after the cylinder pin body 1 extends into the cylinder pin hole 53, in the extension direction X of the boom, the first abutment 2 can abut against the inner wall of the cylinder pin hole 53, that is, when the arm section 5 slides along the retraction direction Y, the inner wall of the cylinder pin hole 53 can abut against the first abutment 2.

[0048] The first buffer mechanism is connected to the first abutment 2, and in the extension direction X of the boom, the first buffer structure can provide a buffer force for the first abutment 2, that is, when the first abutment 2 slides along the retraction direction Y of the boom, the first buffer structure can provide a force along the extension direction X of the boom, thereby providing a buffer force for the first abutment 2.

[0049] With this arrangement, when retracting a boom section 5, the cylinder head 6 is moved until the cylinder pin body 1 is aligned with the cylinder pin hole 53 on the boom section 5, the cylinder pin body 1 is inserted into the cylinder pin hole 53 on the boom section 5, and then the cylinder head 6 is moved in the boom retraction direction Y until the rear side of the cylinder pin body 1 abuts against the rear side of the cylinder pin hole 53. Continuing to move the cylinder head 6 in the telescopic boom retraction direction Y can pull the boom section 5 back.

[0050] If the arm section 5 moves to a certain position, the friction between it and the adjacent arm section 5 is too large, resulting in a large kinetic energy when the arm section 5 is pulled, and the retraction speed of the arm section 5 is faster than the cylinder head 6. When the arm section 5 retracts, the front side wall of the cylinder pin hole 53 moves close to the front side of the cylinder pin body 1, and the front side wall of the cylinder pin hole 53 first abuts against the first abutment 2, and then pushes the first abutment 2 to slide along the retraction direction Y of the boom, until the first abutment 2 moves a certain distance, and then the front side wall of the cylinder pin hole 53 contacts the front side of the cylinder pin body 1 again. Since the first buffer structure provides a buffering force for the first abutment 2 during the sliding of the first abutment 2 along the retraction direction Y of the boom, the first abutment 2 can slide relatively slowly, buffering the retraction action of the arm section 5, thereby reducing the impact force of the front side wall of the cylinder pin hole 53 on the front side of the cylinder pin body 1 and reducing abnormal noise.

[0051] The front side wall of the cylinder pin hole 53 is the side wall of the cylinder pin hole 53 located on the front side in the boom extension direction X, and the front side wall of the cylinder pin hole 53 is the side wall of the cylinder pin hole 53 located on the rear side in the boom extension direction X. The front side portion of the cylinder pin body 1 is the portion of the cylinder pin body 1 located on the front side in the boom extension direction X, and the front side portion of the cylinder pin body 1 is the portion of the cylinder pin body 1 located on the rear side in the boom extension direction X.

[0052] The first abutment 2 can be configured to slide between a first position and a second position. When the first abutment 2 is in the first position, the first abutment 2 extends out from the front side of the cylinder pin body 1. The first abutment 2 slides from the first position to the second position along the boom retraction direction Y. When the first abutment is in the second position, the first abutment 2 slides to the rear side of the front side of the cylinder pin body 1 so that the front side wall of the cylinder pin hole 53 can contact the front side of the cylinder pin body 1.

[0053] It is worth noting that this is not limited to the situation when a certain arm section 5 of the boom is retracted. In any case, as long as the front side wall of the cylinder pin hole 53 and the front side of the cylinder pin body 1 are in contact and close to each other, the first abutment 2 and the first buffer mechanism can play a buffering role to reduce the impact force between the two.

[0054] As an optional embodiment, a sliding hole 11 is provided on the cylinder pin body 1 , and the sliding hole 11 is provided along the extension and retraction direction of the boom.

[0055] The first abutment 2 includes a slider 21 and an abutment rod 22. The slider 21 is slidably connected to the sliding hole 11. The slider 21 separates the sliding hole 11 to form a piston-cylinder structure. The abutment rod 22 has a first end and a second end. The first end of the abutment rod 22 is connected to the slider 21, and the second end of the abutment rod 22 is used to abut against the hole wall of the cylinder pin hole 53. The abutment rod 22 is arranged from the second end to the first end along the extension direction X of the boom. The side of the slider 21 facing away from the abutment rod 22 is surrounded by the inner wall of the sliding hole 11 to form a first flow cavity. After the cylinder pin body 1 extends into the cylinder pin hole 53 on the arm section 5, the second end of the abutment rod 22 is arranged close to the front side wall of the cylinder pin hole 53.

[0056] The first buffer mechanism includes a balancing valve, which connects the first flow cavity with the balancing valve through the fluid channel 12. The fluid channel 12 and the first flow cavity are filled with hydraulic oil. Under the action of the balancing valve, the hydraulic oil can only pass through the balancing valve when the pressure of the hydraulic oil is greater than the set value of the balancing valve, so that the balancing valve provides back pressure for the side of the slider 21 away from the abutment rod 22.

[0057] After the cylinder pin body 1 extends into the cylinder pin hole 53 in the boom section 5, the front side wall of the cylinder pin hole 53 moves closer to the front side of the cylinder pin body 1. The front side wall of the cylinder pin hole 53 first abuts the second end of the abutment rod 22. At this time, the impact force of the boom section 5 is greater than the back pressure generated by the balance valve. After the impact force of the boom section 5 is partially offset by the balance valve, the remaining impact force pushes the abutment rod 22 and the slider 21 to slide in the boom retraction direction Y. The first flow chamber is compressed, and the hydraulic oil flows out through the fluid channel 12 and the balance valve in sequence.

[0058] In this way, the back pressure generated by the balancing valve and the flow of hydraulic oil act as a buffer for the sliding of the abutment rod 22 and the slider 21, so that the front side wall of the cylinder pin hole 53 moves closer to the front side of the cylinder pin body 1 at a relatively slow speed, thereby reducing the impact force and abnormal noise when the front side wall of the cylinder pin hole 53 contacts the front side of the cylinder pin body 1.

[0059] The sliding hole 11 extends through the front side of the cylinder pin body 1. When the first abutting member 2 is in the first position, the second end of the abutting rod 22 extends out of the sliding hole 11 and out of the front side of the cylinder pin body 1. When the first abutting member 2 is in the second position, the second end of the abutting rod 22 slides into the sliding hole 11 and is located behind the front side of the cylinder pin body 1. This allows the front side wall of the cylinder pin hole 53 to contact the front side of the cylinder pin body 1.

[0060] The balancing valve is connected to the oil tank through a pipeline, and the oil flowing out of the fluid channel 12 through the balancing valve enters the oil tank.

[0061] The oil tank is connected to the fluid pipeline through the oil pump. After the front side wall of the cylinder pin hole 53 pushes the first abutment 2 to slide to the second position and enters the sliding hole 11, the front side wall of the cylinder pin hole 53 contacts the front side of the cylinder pin body 1. Subsequently, when the front side wall of the cylinder pin hole 53 and the front side of the cylinder pin body 1 move away from each other, the oil pump can be used to pump hydraulic oil into the fluid pipeline to push the first abutment 2 to move along the extension direction X of the boom to the first position, so that the first abutment 2 and the buffer mechanism can normally play a buffering role when the front side wall of the cylinder pin hole 53 and the front side of the cylinder pin body 1 approach each other next time.

[0062] In an optional embodiment, the cylinder pin further includes a connecting member 3 and a first elastic member 4. The connecting member 3 is at least partially inserted into the sliding hole 11. A through-hole is formed through the connecting member 3, and the abutment rod 22 is slidably provided in the connecting member 3, that is, the abutment rod 22 is provided through the through-hole and can slide along the through-hole.

[0063] The first elastic member 4 is connected between the connecting member 3 and the slider 21 , that is, a first end of the first elastic member 4 is connected to the connecting member 3 , and a second end of the first elastic member 4 is connected to the slider 21 .

[0064] In this way, the side of the slider 21 away from the abutment rod 22 is connected to the balance valve through hydraulic oil. Under the back pressure provided by the balance valve, the slider 21 cannot slide along the retraction direction Y of the boom without external force.

[0065] The side of the slider 21 facing away from the contact rod 22 is connected to the connecting member 3 via the first elastic member 4. As a result, under the elastic force of the first elastic member 4, the slider 21 tends to slide in the boom retraction direction Y. In the absence of other external forces, it cannot slide in the boom extension direction. The connecting member 3 is then fixed.

[0066] When the front side wall of the cylinder pin hole 53 moves closer to the front side of the cylinder pin body 1, it first abuts the second end of the abutment rod 22. Under the combined action of the elastic force of the first elastic member 4 and the impact force of the boom section 5, the force applied to the slider 21 in the boom retraction direction Y is greater than the back pressure generated by the balancing valve. As a result, after the impact force of the boom section 5 is partially offset by the balancing valve, the remaining impact force pushes the abutment rod 22 and slider 21 to slide in the boom retraction direction Y. The first flow chamber is compressed, and the hydraulic oil flows out through the fluid channel 12 and the balancing valve in sequence.

[0067] After the front side wall of the cylinder pin hole 53 pushes the first abutment 2 to slide to the second position and enters the sliding hole 11, the front side wall of the cylinder pin hole 53 contacts the front side of the cylinder pin body 1. Subsequently, when the front side wall of the cylinder pin hole 53 and the front side of the cylinder pin body 1 move away from each other, hydraulic oil can be pumped into the fluid pipeline to push the first abutment 2 to move to the first position along the extension direction X of the boom, so that the next time the front side wall of the cylinder pin hole 53 and the front side of the cylinder pin body 1 approach each other, the first abutment 2 and the buffer mechanism can play a normal buffering role. At this time, the first elastic member 4 is compressed, and under the elastic force of the first elastic member 4, the abutment rod 22 is ensured to be stable in the first position.

[0068] The first elastic member 4 can be a spring.

[0069] In an optional embodiment, the cylinder pin further includes a seal, which is at least partially inserted into the slide hole 11. A through hole is formed in the seal, and the abutment rod 22 is slidably inserted into the connector 3, that is, the abutment rod 22 is provided through the through hole and can slide along the through hole, and the seal acts as a seal between the outer wall of the abutment rod 22 and the inner wall of the slide hole 11.

[0070] When the slider 21 separates the sliding hole 11, the side of the slider 21 facing away from the seal forms a first flow cavity, and the side of the slider 21 closer to the seal forms a second flow cavity. The sliding hole 11, seal, abutment rod 22, and slider 21 together form a piston-cylinder structure, where the sliding hole 11 can be considered a piston hole, the abutment rod 22 can be considered a piston rod, the sliding hole 11 can be considered a piston, the first flow cavity can be considered a rodless cavity, and the second flow cavity can be considered a rod-supported cavity.

[0071] Thus, when hydraulic oil is introduced into the first flow chamber, the slider 21 slides toward the seal, causing the abutment rod 22 to slide in the boom extension direction X. When hydraulic oil is introduced into the second flow chamber, the slider 21 slides away from the seal, causing the abutment rod 22 to slide in the boom retraction direction Y.

[0072] Before the cylinder pin body 1 is inserted into the cylinder pin hole 53, hydraulic oil can be introduced into the second flow chamber to make the abutment rod 22 slide along the boom retraction direction Y, so that the abutment rod 22 enters the sliding hole 11, preventing the abutment rod 22 from contacting the hole wall of the cylinder pin hole 53. After the cylinder pin body 1 is inserted into the cylinder pin hole 53, hydraulic oil can be introduced into the first flow chamber to make the abutment rod 22 slide along the boom extension direction X, so that the abutment rod 22 extends out of the sliding hole 11 and extends out of the front side of the cylinder pin body 1, so that when the front side wall of the cylinder pin hole 53 and the front side of the cylinder pin body 1 approach each other, the first abutment member 2 and the buffer mechanism can normally play a buffering role.

[0073] Before the cylinder pin body 1 leaves the cylinder pin hole 53, hydraulic oil can be introduced into the second flow chamber to make the abutment rod 22 slide along the retraction direction Y of the boom, so that the abutment rod 22 enters the sliding hole 11 to prevent the abutment rod 22 from contacting the hole wall of the cylinder pin hole 53.

[0074] As an optional embodiment, the first buffer mechanism includes a second elastic member, through which the first abutting member 2 is connected to the cylinder pin body 1. Under the elastic force of the second elastic member, the first abutting member 2 tends to slide along the extension direction X of the boom.

[0075] Thus, when retracting a certain boom section 5, the cylinder head 6 is moved until the cylinder pin body 1 is aligned with the cylinder pin hole 53 on the boom section 5, the cylinder pin body 1 is inserted into the cylinder pin hole 53 on the boom section 5, and then the cylinder head 6 is moved along the boom retraction direction Y until the rear side of the cylinder pin body 1 abuts against the rear side of the cylinder pin hole 53. Continuing to move the cylinder head 6 along the telescopic boom retraction direction Y can pull the boom section 5 back.

[0076] If the arm section 5 moves to a certain position, the friction between it and the adjacent arm section 5 is too large, resulting in a large kinetic energy when the arm section 5 is pulled, and the retraction speed of the arm section 5 is faster than the cylinder head 6. When the arm section 5 retracts, the front side wall of the cylinder pin hole 53 moves close to the front side of the cylinder pin body 1, and the front side wall of the cylinder pin hole 53 first abuts against the first abutting member 2, and then overcomes the elasticity of the second elastic member to push the first abutting member 2 to slide along the retraction direction Y of the boom, until the first abutting member 2 moves a certain distance, and the front side wall of the cylinder pin hole 53 contacts the front side of the cylinder pin body 1 again.

[0077] Since the second elastic member provides a buffering force for the first abutment member 2 during the sliding of the first abutment member 2 along the retraction direction Y of the boom, the first abutment member 2 can slide relatively slowly, buffering the retraction action of the arm section 5, thereby reducing the impact force of the front side wall of the cylinder pin hole 53 on the front side of the cylinder pin body 1 and reducing abnormal noise.

[0078] Subsequently, when the front side wall of the cylinder pin hole 53 and the front side portion of the cylinder pin body 1 move away from each other, the second elastic member rebounds to push the first abutment member 2 to move to the first position along the extension direction X of the boom, so that the next time the front side wall of the cylinder pin hole 53 and the front side portion of the cylinder pin body 1 approach each other, the first abutment member 2 and the second elastic member can normally play a buffering role.

[0079] The second elastic member may be a spring.

[0080] Specifically, a mounting hole can be formed in the front side of the cylinder pin body 1 along the boom retraction direction Y. The first end of the second elastic member is connected to the bottom of the mounting hole. The first end of the first abutment member 2 is inserted into the mounting hole and connected to the second end of the second elastic member. Under the elastic force of the second elastic member, the second end of the first abutment member 2 extends out of the mounting hole.

[0081] A slide groove can also be opened on the cylinder pin body 1 so that the slide groove passes through the front side of the cylinder pin body 1, a baffle is set on the outer wall of the second elastic member, and the first abutment member 2 and the second elastic member are respectively installed in the slide groove so that the first abutment member 2 is slidably connected to the slide groove.

[0082] In an optional embodiment, the cylinder pin further includes a driving assembly, which is connected to the cylinder pin body 1 and is capable of driving the first abutment member 2 to slide along the retraction direction Y of the boom.

[0083] Before the cylinder pin body 1 is inserted into the cylinder pin hole 53, the driving assembly can be used to drive the first abutment 2 to slide along the boom retraction direction Y. This allows the first abutment 2 to enter the mounting hole and prevent the first abutment 2 from contacting the wall of the cylinder pin hole 53. After the cylinder pin body 1 is inserted into the cylinder pin hole 53, the driving force of the driving assembly can be canceled. Under the rebound action of the second elastic member, the first abutment 2 extends out of the mounting hole and out of the front side of the cylinder pin body 1, so that when the front side wall of the cylinder pin hole 53 and the front side of the cylinder pin body 1 approach each other, the first abutment 2 and the second elastic member can normally play a buffering role.

[0084] Before the cylinder pin body 1 leaves the cylinder pin hole 53 , the driving assembly can be used to drive the first abutment 2 to slide along the boom retraction direction Y so that the first abutment 2 enters the mounting hole to prevent the first abutment 2 from contacting the hole wall of the cylinder pin hole 53 .

[0085] The driving member may be an electric rod, which pushes the first abutment member 2 to slide along the retraction direction Y of the boom when the electric rod is extended. When the electric rod is retracted, the first abutment member 2 slides along the extension direction X of the boom under the elastic force of the second elastic member.

[0086] The driving member can also be a cylinder. When the piston rod of the cylinder is extended, it pushes the first abutment member 2 to slide along the retraction direction Y of the boom. When the piston rod of the cylinder is retracted, under the elastic force of the second elastic member, the first abutment member 2 slides along the extension direction X of the boom.

[0087] As an optional embodiment, the cylinder pin also includes a second abutment and a second buffer mechanism. The second abutment is slidably connected to the cylinder pin body 1, so that the second abutment can slide along the extension and retraction direction of the boom. The second abutment can extend from the rear side of the cylinder pin body 1 along the retraction direction Y of the boom. Therefore, after the cylinder pin body 1 extends into the cylinder pin hole 53, the second abutment can abut against the rear side wall of the cylinder pin hole 53 in the retraction direction Y of the boom, that is, when the cylinder pin body 1 slides along the retraction direction Y of the boom, the rear side wall of the cylinder pin hole 53 can abut against the front side of the first abutment 2.

[0088] The second buffer mechanism is connected to the second abutment, and in the retraction direction Y of the boom, the second buffer structure can provide a buffer force for the second abutment, that is, when the second abutment slides along the extension direction of the boom, the second buffer structure can provide a force along the retraction direction Y of the boom, thereby providing a buffer force for the second abutment.

[0089] With this arrangement, when retracting a certain boom section 5, the cylinder head 6 is moved until the cylinder pin body 1 is aligned with the cylinder pin hole 53 on the boom section 5, the cylinder pin body 1 is inserted into the cylinder pin hole 53 on the boom section 5, and then the cylinder head 6 is moved in the boom retraction direction Y, thereby driving the cylinder pin to move in the boom retraction direction Y. At this time, the rear side wall of the cylinder pin hole 53 first abuts against the second abutment member, which then pushes the second abutment member to move in the boom extension direction X. After the second abutment member moves a certain distance, the rear side wall of the cylinder pin hole 53 contacts the rear side of the cylinder pin body 1 again.

[0090] Since the second abutment member provides a buffering force for the second abutment member during the sliding process along the extension direction X of the boom, the second abutment member can slide more slowly, thereby reducing the impact force of the rear side of the cylinder pin body 1 on the rear side wall of the cylinder pin hole 53 and reducing abnormal noise.

[0091] The structures of the first abutting member 2 and the second abutting member can be the same, and the first abutting member 2 and the second abutting member only need to be arranged in a mirror image.

[0092] The first buffer mechanism and the second buffer mechanism may be the same, and they only need to be arranged in a mirror image.

[0093] According to an embodiment of the present application, on the other hand, a lifting arm is provided, comprising any of the above-mentioned cylinder pins. The technical effects brought about by the lifting arm are consistent with the technical effects brought about by the cylinder pin, so they will not be described in detail.

[0094] As an optional embodiment, the boom further includes a cylinder head 6 and multiple boom sections 5. The boom sections 5 are nested one after the other, allowing any two adjacent boom sections 5 to slide relative to each other, allowing the boom to extend or retract. The direction of extension and retraction of the boom is the direction of relative sliding between any two adjacent boom sections 5. Each boom section 5 is provided with an arm pin hole 52 and a cylinder pin hole 53.

[0095] The cylinder head 6 is slidably connected to the first boom section 5 and can slide along the telescopic direction of the boom. The first boom section 5 is connected to a slide rail, which is arranged along the telescopic direction of the boom, and the cylinder head 6 is slidably connected to the slide rail and can slide along the slide rail.

[0096] The cylinder pin body 1 is telescopically arranged on the cylinder head 6, so that the cylinder pin body 1 can be telescopic relative to the cylinder head 6. A pin pulling device 61 is provided on the cylinder head 6, which can drive the arm pin 51 on the arm section 5 to retract and leave the arm pin hole 52 on the adjacent arm section 5.

[0097] When the boom needs to be extended, the cylinder head 6 is slid along the extension direction X of the boom, so that the pin pulling device 61 acts on the arm pin 51 on one arm section 5, and the cylinder pin body 1 is aligned with the cylinder pin hole 53 on the arm section 5. The cylinder pin body 1 is inserted into the cylinder pin hole 53 on the arm section 5, and the pin pulling device 61 is used to retract the arm pin 51 on the arm section 5 and leave the arm pin hole 52 in which it is located. Continue to slide the cylinder head 6 along the extension direction X of the boom, and the boom section 5 can be pushed to slide along the extension direction X of the boom until the arm pin 51 on the arm section 5 is aligned with another arm pin hole 52. The pin pulling device 61 is used to release the arm pin 51 on the arm section 5 and extend it into the arm pin hole 52 with which it is aligned.

[0098] Afterwards, due to the gap between the arm pin 51 and the inner wall of the arm pin hole 52, in order to make the connection between the arm pin 51 and the arm pin hole 52 more reliable, it is necessary to slide the cylinder head 6 along the retraction direction Y of the boom, so that the boom section 5 slides along the retraction direction Y of the boom, and the arm pin 51 slides along the retraction direction Y of the boom until it fits with the rear side wall of the arm pin hole 52.

[0099] The rear side wall of the arm pin hole 52 is the side wall of the arm pin hole 52 in the retraction direction Y of the boom.

[0100] There is a gap between the cylinder pin body 1 and the cylinder pin hole 53. The cylinder pin body 1 can only pull the arm section 5 back when the rear side of the cylinder pin body 1 contacts the rear side wall of the cylinder pin hole 53. When the cylinder pin body 1 stops, the front side of the cylinder pin body 1 will continue to move closer to the front side wall of the cylinder pin hole 53 until the arm pin 51 contacts the rear side wall of the arm pin hole 52, at which point the arm section 5 stops.

[0101] This means that when the cylinder head 6 and the cylinder pin body 1 stop, the arm section 5 will still move in the retraction direction Y of the boom for a period of time. During this period, the front side wall of the cylinder pin body 1 first abuts against the first abutment 2. The first abutment 2 is then pushed to slide in the retraction direction Y of the boom until the first abutment 2 moves a certain distance and the arm pin 51 abuts against the rear side wall of the arm pin hole 52. Since the first buffer structure provides a buffering force for the first abutment 2 during the sliding of the first abutment 2 in the retraction direction Y of the boom, the first abutment 2 can slide relatively slowly, thereby buffering the retraction action of the arm section 5. This buffers the movement of the arm pin 51 on the arm section 5 in the retraction direction Y of the boom, thereby reducing the impact force of the arm pin 51 on the rear side wall of the arm pin hole 52 and reducing abnormal noise.

[0102] According to an embodiment of the present application, on the other hand, a crane is provided, comprising any of the above cylinder pins or booms. The technical effects brought about by the crane are the same as those brought about by the cylinder pins or booms, so they will not be described in detail.

[0103] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the present application.

Claims

1. A cylinder pin, characterized in that: include: The cylinder pin body (1) is adapted to be telescopically connected to the cylinder head (6) and to extend into the cylinder pin hole (53); A first abutment member (2) is slidably connected to the cylinder pin body (1) and is capable of sliding along the extension direction of the boom. The first abutment member (2) is adapted to abut against the wall of the cylinder pin hole (53) along the extension direction of the boom. A first buffer mechanism is connected to the first abutment member (2); in the extension direction of the boom, the first buffer structure is suitable for providing a buffer force for the first abutment member (2).

2. The cylinder pin according to claim 1, characterized in that: A sliding hole (11) is provided on the cylinder pin body (1) along the telescopic direction of the boom; The first abutment member (2) includes a slider (21) and an abutment rod (22), wherein the slider (21) is slidably connected to the slide hole (11) and separates the interior of the slide hole (11), one end of the abutment rod (22) is connected to the slider (21), and the other end is adapted to abut against the hole wall of the cylinder pin hole (53), and a side of the slider (21) facing away from the abutment rod (22) forms a first flow cavity with the inner wall of the slide hole (11); The first buffer mechanism comprises a balancing valve, the first flow chamber is connected to the balancing valve through a fluid channel (12), and the balancing valve is suitable for providing back pressure for the side of the slider (21) facing away from the abutting rod (22).

3. The cylinder pin according to claim 2, characterized in that: Also includes: A connecting member (3) is at least partially inserted into the sliding hole (11), and the abutting rod (22) is slidably inserted into the connecting member (3); A first elastic member (4) is connected between the connecting member (3) and the slider (21). Under the elastic force of the first elastic member (4), the slider (21) tends to slide away from the connecting member (3). The balancing valve is an adjustable balancing valve.

4. The cylinder pin according to claim 2, characterized in that: Also includes: The sealing member is at least partially inserted into the sliding hole (11), the abutting rod (22) is slidably inserted into the sealing member, the side of the slider (21) facing away from the sealing member forms the first flow cavity, and the side of the slider (21) close to the sealing member forms the second flow cavity.

5. The cylinder pin according to claim 1, characterized in that: The first buffer mechanism includes a second elastic member, and the first abutment member (2) is connected to the cylinder pin body (1) through the second elastic member. Under the elastic force of the second elastic member, the first abutment member (2) tends to slide along the extension direction of the boom.

6. The cylinder pin according to claim 5, characterized in that: Also includes: A driving assembly is connected to the cylinder pin body (1) and is suitable for driving the first abutment member (2) to slide along the retraction direction of the boom.

7. The cylinder pin according to claim 1, characterized in that Also includes: A second abutment member is slidably connected to the cylinder pin body (1) and can slide along the extension direction of the boom, and the second abutment member is suitable for abutting against the wall of the cylinder pin hole (53) along the retraction direction of the boom; The second buffer mechanism is connected to the second abutting member. In the retracting direction of the boom, the buffer structure is suitable for providing a buffer force for the second abutting member.

8. A lifting arm, characterized in that: Including the cylinder pin according to any one of claims 1-7.

9. The lifting arm according to claim 8, characterized in that Also includes: A plurality of arm sections (5) are sequentially sleeved, and any two adjacent arm sections (5) can slide relative to each other to allow the boom to be telescopically extended. Each arm section (5) is telescopically provided with an arm pin (51), each arm section (5) is provided with an arm pin hole (52), and each arm section (5) is provided with a cylinder pin hole (53); The cylinder head (6) is slidably connected to the first arm section (5) and can slide along the telescopic direction of the lifting arm. The cylinder pin is telescopically arranged on the cylinder head (6). The cylinder pin is suitable for extending into the cylinder pin hole (53). The cylinder head (6) is provided with a pin pulling device (61) for retracting the arm pin (51).

10. A crane, characterized in that: It comprises the cylinder pin according to any one of claims 1 to 7 or the lifting arm according to any one of claims 8 to 9.

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