Telescopic arm locking device, telescopic arm system and crane

Abstract

The utility model relates to the technical field of cranes, and discloses a telescopic arm locking device, a telescopic arm system and a crane. The cylinder pin assembly comprises a cylinder pin arranged in the seat body; and an arm pin insertion and extraction assembly. The arm pin inserting and pulling assembly comprises two sets of arm pin oil cylinders arranged on the base body, and at least two arm pin oil cylinders exist in each set of arm pin oil cylinders. The matching seat is connected with the pin pulling driving end of the arm pin oil cylinder; one end of the matching piece is fixed on the matching seat between the adjacent arm pin oil cylinders, and the other end of the matching piece extends into the seat body; the cylinder pin assembly and the arm pin inserting and pulling assembly are integrated into the same seat body and located on the adjacent working faces, the arm pin is sleeved with the clamping groove of the matching seat, and the locking and unlocking processes of the arm pin can be completed by being driven by the pin pulling driving end connected with the matching seat to move. The overall size of the device is small, the size of the device in the telescopic direction of the telescopic arm can be effectively reduced, and an extra telescopic stroke is provided for the cargo boom.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hoist, concretely relates to telescopic arm locking device, telescopic arm system and hoist. BACKGROUND

[0002] Single cylinder bolt technology is one of the important technologies for realizing the telescopic process of the hoist arm. The technology realizes the accurate locking and unlocking of each segment of the hoist arm through the cooperation of the hydraulic cylinder and the bolt, the locking and unlocking process of the cylinder pin of the hydraulic cylinder and the arm pin, ensures that the hoist arm can realize the telescopic process, and ensures the stability and safety of the hoist arm in different operating states.

[0003] The single cylinder bolt technology is usually composed of a cylinder pin oil cylinder and an arm pin oil cylinder capable of controlling the arm pin. The conventional cylinder pin oil cylinder and arm pin oil cylinder are usually arranged in sequence along the elongation direction of the hoist arm. This type of oil cylinder arrangement will occupy more space in the elongation direction of the hoist arm, which will affect the telescopic stroke of the hoist arm. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a telescopic arm locking device, a telescopic arm system and a hoist to solve the problem of large space occupation of the existing driving cylinder arrangement of the hoist arm.

[0005] In the first aspect, the utility model provides a telescopic arm locking device applied to a telescopic arm, the telescopic arm comprising a basic arm and a plurality of arm segments arranged in the basic arm in sequence, the arm segments can be telescoped along a third direction relative to the basic arm under the driving of a telescopic oil cylinder, and the telescopic arm locking device comprises: a seat body fixed to the driving end of the telescopic oil cylinder of the telescopic arm; a cylinder pin assembly comprising a cylinder pin arranged in the seat body, the cylinder pin can be extended out of the seat body along a first direction and retracted into the seat body; and an arm pin plugging assembly; the arm pin plugging assembly comprises: two groups of arm pin oil cylinders arranged in the seat body and arranged along the first direction, the number of arm pin oil cylinders in each group is at least two, and at least two arm pin oil cylinders in each group are arranged along the third direction; a matching seat connected with the pin pulling driving end of the arm pin oil cylinder to move in a second direction away from or close to the seat body under the driving of the arm pin oil cylinder; a matching piece fixed to the matching seat between adjacent arm pin oil cylinders arranged along the third direction at one end, and extended into the seat body along the second direction at the other end, when the matching seat is located close to the seat body, the matching piece abuts against the cylinder pin to limit the retraction of the cylinder pin into the seat body; wherein the first direction, the second direction and the third direction are mutually perpendicular directions.

[0006] Beneficial effects: The cylinder pin assembly and the arm pin plug-pull assembly are integrated into the same seat body, the cylinder pin assembly and the arm pin plug-pull assembly are located on adjacent working surfaces, the cylinder pin assembly can control the locking between the locking device and the arm joint by moving the cylinder pin, after the clamping groove of the matching seat is sleeved on the arm pin, the arm pin can be locked and unlocked by driving the movement of the plug pin driving end (301) directly connected to itself, and the matching part arranged on the matching seat can limit the maximum unlocking movement distance of the matching seat. The overall size of the device is small and can effectively reduce the size of the device along the extension direction of the telescopic arm, providing additional telescopic stroke for the design of the lifting arm, effectively solving the problem of large space occupied by the driving cylinder arrangement of the existing lifting arm.

[0007] In an optional embodiment, the matching seat comprises a matching part and two connecting parts, the matching part comprises a bottom plate and side plates connected to both sides of the bottom plate, the bottom plate and the two side plates form a clamping groove, and the two connecting parts are located on both sides of the matching part in the first direction and are connected to the corresponding side plates. The connecting part is connected to the plug pin driving end of the corresponding group of arm pin oil cylinders.

[0008] Beneficial effects: In this form of matching seat, both connecting parts are connected to the seat body through arm pin oil cylinders, and the overall stress of the matching seat during operation is more uniform.

[0009] In an optional embodiment, the side plate comprises a first plate segment and a second plate segment connected in sequence along the second direction, the first plate segment extends along the second direction and is connected to the bottom plate, and the second plate segment is arranged in a bent manner towards the direction close to the adjacent side plate.

[0010] Beneficial effects: This form of side plate structure is simpler and more reliable, facilitating processing and manufacturing.

[0011] In an optional embodiment, the number of matching parts is two, there are two arm pin oil cylinders in each group of arm pin oil cylinders, each connecting part has a first connecting position for connecting to the plug pin driving end of the two arm pin oil cylinders, and the connecting part also has a second connecting position for connecting to one matching part. The two first connecting positions of the connecting part are spaced apart along the third direction, and the second connecting position of the connecting part is located between the two first connecting positions.

[0012] Beneficial effects: This symmetrical arrangement of matching parts and arm pin oil cylinders can further improve the reliability of the matching seat during operation, and can also improve the uniformity of the force applied to the matching seat when the matching part is limited.

[0013] In an optional embodiment, the seat body is provided with a guide hole, the matching part is movably arranged in the guide hole, the guide hole is further provided with a limiting surface, and the matching part is inserted into the guide hole and has a matching surface for cooperating with the limiting surface.

[0014] Beneficial effect: the limiting structure of this form cooperates with the cooperating piece, so that the cooperating piece can not only limit the moving position of the cooperating seat, but also constrain the moving track of the cooperating seat, which can effectively improve the stability of the cooperating seat during operation.

[0015] In an alternative embodiment, the cylinder pin assembly further comprises a packaging seat and a first elastic piece, the cylinder pin is movably arranged in the packaging seat, the seat body is further provided with a first mounting hole, the packaging seat is assembled in the first mounting hole, and the first elastic piece is located between the bottom wall of the first mounting hole and the cylinder pin.

[0016] Beneficial effect: the cylinder pin assembly is arranged in this way, and only the one-way movement process of the cylinder pin is driven to move outward by the hydraulic oil, and the movement of the cylinder pin in the other direction is realized by the first elastic piece, so that the structure of the cylinder pin assembly is simple and reliable, and the structure of the cylinder pin assembly can be effectively simplified.

[0017] In an alternative embodiment, the guide hole is in communication with the corresponding first mounting hole, the inner wall of the guide hole has a first step surface, the first step surface forms a limiting surface, the outer wall of the cooperating piece has a second step surface, the second step surface forms a cooperating surface, and the end of the cooperating piece away from the connecting part has an avoiding groove for avoiding the first elastic piece.

[0018] Beneficial effect: the guide hole of this form is longer, so that the length of the cooperating piece can also be set longer, the reliability of the guide hole and the cooperating piece during cooperation is improved, and in addition, the avoiding groove can ensure that the cooperating piece avoids interference with the first elastic piece during movement.

[0019] In an alternative embodiment, the arm pin oil cylinder comprises a cylinder body and a second elastic piece, the pin pulling driving end is movably arranged in the cylinder body, the seat body is further provided with a second mounting hole, the cylinder body is assembled in the second mounting hole, the inner wall of the second mounting hole has a third step surface, the second elastic piece is located between the third step surface and the connecting part, and / or the telescopic arm locking device further comprises a buffer assembly, the buffer assembly is arranged on both sides of the cooperating seat along the first direction, and each buffer assembly is elastically connected with the connecting part on the same side.

[0020] Beneficial effect: after the one-way movement of the pin pulling driving end is completed by the hydraulic oil in the cylinder body, the pin pulling driving end can be reset by the second elastic piece, and the structure is simple and reliable.

[0021] In the second aspect, the utility model further provides a telescopic arm system, which comprises: a telescopic arm, comprising a basic arm and a plurality of arm sections arranged in the basic arm and sequentially sleeved; the telescopic arm locking device, which is movably arranged in the telescopic arm;

[0022] A telescopic driving assembly is connected with the seat body of the telescopic arm locking device and is suitable for driving the arm sections to telescope along the third direction.

[0023] Thirdly, the present invention also provides a crane, which includes: the telescopic boom locking device described above, or the telescopic boom system described above. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional schematic diagram of a telescopic arm locking device according to an embodiment of the present utility model;

[0026] Figure 2 for Figure 1 Front view of the telescopic arm locking device shown;

[0027] Figure 3 for Figure 2 A cross-sectional view of the telescopic arm locking device shown at point AA;

[0028] Figure 4 for Figure 2 Left view of the telescopic arm locking device shown;

[0029] Figure 5 for Figure 4 A cross-sectional view of the telescopic arm locking device at point BB.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Base; 101. First working surface; 102. Second working surface; 103. Guide hole; 1031. Limiting surface; 104. First mounting hole; 105. Second mounting hole;

[0032] 2. Cylinder pin assembly; 201. Cylinder pin; 202. Encapsulation base; 203. First elastic element;

[0033] 3. Arm pin cylinder; 301. Pin puller drive end; 302. Cylinder body; 303. Second elastic element; 304. Limiting element;

[0034] 4. Mating seat; 401. Slot; 402. Mating part; 4021. Base plate; 4022. Side plate; 40221. First plate segment; 40222. Second plate segment; 403. Connecting part; 4031. First connecting position; 4032. Second connecting position;

[0035] 5. Mating parts; 501. Mating surface; 502. Clearance groove; 6. Buffer assembly. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0037] The embodiments of the utility model will be described below in combination with Figures 1 to 5

[0038] According to the embodiments of the utility model, on the one hand, a telescopic arm locking device is provided, which is applied to a telescopic arm. The telescopic arm comprises a basic arm and a plurality of arm sections which are sequentially sleeved in the basic arm. The arm sections can be telescoped along a third direction relative to the basic arm under the driving of a telescopic oil cylinder. The telescopic arm locking device comprises a seat body 1, a cylinder pin assembly 2 and an arm pin plug-pull assembly. The seat body 1 is fixed to the driving end of the telescopic oil cylinder of the telescopic arm. The cylinder pin assembly 2 comprises a cylinder pin 201 arranged in the seat body 1. The cylinder pin 201 can be extended out of the seat body 1 along a first direction and retracted into the seat body 1.

[0039] The arm pin plug-pull assembly comprises two groups of arm pin oil cylinders 3, a matching seat 4 and a matching piece 5. The two groups of arm pin oil cylinders 3 are arranged in the seat body 1 and arranged along the first direction. The number of arm pin oil cylinders 3 in each group is at least two. At least two arm pin oil cylinders 3 in each group are arranged along the third direction. The matching seat 4 is connected with the plug-pull driving end 301 of the arm pin oil cylinder 3, so as to be moved in a second direction away from or close to the seat body 1 under the driving of the arm pin oil cylinder 3. One end of the matching piece 5 is fixed to the matching seat 4 between the adjacent arm pin oil cylinders 3 arranged along the third direction, and the other end is extended into the seat body 1 along the second direction. When the matching seat 4 is located close to the seat body 1, the matching piece 5 abuts against the cylinder pin 201 to limit the retraction of the cylinder pin 201 into the seat body 1.

[0040] Among them, the first direction, the second direction and the third direction are directions perpendicular to each other.

[0041] ​The telescopic arm locking device of the embodiment integrates the cylinder pin assembly 2 and the arm pin plugging assembly into the same seat body 1, the cylinder pin assembly 2 and the arm pin plugging assembly are located on adjacent working surfaces, the cylinder pin assembly 2 can control whether the arm pin is locked between the arm joints by moving the cylinder pin 201, after the clamping groove 401 of the cooperating seat 4 is sleeved on the arm pin, the arm pin locking and unlocking process can be completed by driving and moving the plugging driving end 301 directly connected with itself, and the cooperating part 5 arranged on the cooperating seat 4 can limit the maximum unlocking movement distance of the cooperating seat 4, the overall size of the device is small, and the size of the device along the telescopic direction of the telescopic arm can be effectively reduced, which provides an additional telescopic stroke for the design of the lifting arm, and effectively solves the problem of large space occupied by the driving cylinder arrangement of the existing lifting arm.

[0042] It should be noted that the first direction refers to the direction of the arrow in the figure Figure 1 The second direction refers to the direction of the arrow in the figure Figure 1 The third direction refers to the direction of the arrow in the figure Figure 1 The third direction refers to the direction of the arrow in the figure

[0043] Specifically, the specific form of the clamping groove 401 in the cooperating seat 4 is not limited, which can be a dovetail groove with the cross section of the space in the groove being inverted trapezoidal, or a groove body with the cross section of the space in the groove being "convex", as long as the pin head of the arm pin can be sleeved and the arm pin can be plugged.

[0044] Further, the two end faces of the seat body 1 along the first direction respectively form the first working surface 101, one end face of the seat body 1 along the second direction forms the second working surface 102, the cylinder pin assembly 2 is arranged at the two ends of the seat body 1 along the first direction, the cylinder pin 201 can move along the first direction and extend out of the first working surface 101, and the plugging driving end 301 can move along the second direction and extend out of the second working surface 102; the groove width of the clamping groove 401 gradually decreases along the direction away from the seat body 1.

[0045] In addition, the number of arm pin oil cylinders 3 in each group of arm pin oil cylinders 3 is not limited, which can be two or more than two, such as three or four, which can be flexibly selected according to requirements.

[0046] In one possible implementation, the mating seat 4 includes a mating part 402 and two connecting parts 403. The mating part 402 includes a base plate 4021 and side plates 4022 connected to both sides of the base plate 4021. The base plate 4021 and the side plates 4022 together form a slot 401. The two connecting parts 403 are located on both sides of the mating part 402 in a first direction and are connected to the corresponding side plates 4022. The connecting parts 403 are connected to the pin-pulling drive end 301 of a corresponding set of arm pin cylinders 3. In this type of mating seat 4, both connecting parts 403 are connected to the seat body 1 through arm pin cylinders 3, and the overall force of the mating seat 4 is more uniform when it is working.

[0047] Specifically, the number of arm pin cylinders 3 connected to each connecting part 403 is not strictly limited, and each connecting part 403 can be connected to the base body 1 by two or more arm pin cylinders 3.

[0048] The molding method for mating part 402 and connecting part 403 is not limited. It can be an integral structure molded in one piece, or it can be a component formed by connecting separately molded parts through another connecting process. The specific manufacturing method can be flexibly selected according to the requirements.

[0049] In one possible implementation, the side panel 4022 includes a first plate segment 40221 and a second plate segment 40222 connected sequentially along a second direction. The first plate segment 40221 extends along the second direction and is connected to the bottom plate 4021. The second plate segment 40222 is bent toward the direction of the adjacent side panel 4022. This type of side panel 4022 structure is simpler and more reliable, and easier to process and manufacture.

[0050] Specifically, the outer diameter of the head of the arm pin is larger than the outer diameter of the rod. The distance between the first plate segment 40221 of the two side plates 4022 is greater than the outer diameter of the head of the arm pin, while the distance between the second plate segment 40222 of the two side plates 4022 is greater than the outer diameter of the rod of the arm pin and smaller than the outer diameter of the head of the arm pin.

[0051] Furthermore, such as Figure 1 As shown, since the arm pin will be inserted into the slot 401 along the third direction, in order to facilitate the arm pin entering the slot 401, the corner of the second plate segment 40222 near the adjacent side plate 4022 is chamfered.

[0052] There are no restrictions on the specific method of chamfering; it can be either rounded or flat.

[0053] In a possible implementation, the number of the matching pieces 5 is two, there are two arm pin oil cylinders 3 in each set of the arm pin oil cylinders 3, each connecting part 403 has a first connecting position 4031 for connecting with the pin pulling driving end 301 of the two arm pin oil cylinders 3, the connecting part 403 further has a second connecting position 4032 for connecting with one matching piece 5, the two first connecting positions 4031 of the connecting part 403 are arranged at intervals along the third direction, and the second connecting position 4032 of the connecting part 403 is located between the two first connecting positions 4031. In this way, the matching piece 5 and the arm pin oil cylinder 3 are arranged in a symmetrical manner, which can further improve the reliability of the matching seat 4 in the working process, and in addition, the uniformity of the force applied to the matching seat 4 by the matching piece 5 when limiting the matching seat 4 can be improved.

[0054] Specifically, as shown in Figure 1 , the first connecting position 4031 and the second connecting position 4032 are both connecting structures protruding towards the side of the connecting part 403 along the first direction.

[0055] Further, the connecting part 403 is provided with a through hole corresponding to the positions of the first connecting position 4031 and the second connecting position 4032, and the matching piece 5 and the pin pulling driving end 301 are both arranged in the corresponding through hole and fixedly connected with the connecting part 403 through a fastening part.

[0056] As an alternative implementation, the matching piece 5 and the pin pulling driving end 301 can also be connected with the connecting part 403 through welding or the like.

[0057] In a possible implementation, the seat body 1 is provided with a guide hole 103, the matching piece 5 is movably arranged in the guide hole 103, the guide hole 103 is further provided with a limiting surface 1031, and the matching piece 5 is arranged in the guide hole 103 and has a matching surface 501 for cooperating with the limiting surface 1031. In this way, the limiting structure cooperates with the matching piece 5, so that the matching piece 5 can not only limit the movement position of the matching seat 4, but also constrain the movement track of the matching seat 4, which can effectively improve the stability of the matching seat 4 in the working process.

[0058] Specifically, as shown in Figure 3 , the guide hole 103 is located on the second working surface 102, and the axial direction of the guide hole 103 is the extension direction of the pin pulling driving end 301 in the arm pin oil cylinder 3. It can be understood that this direction is also the axial direction of the arm pin.

[0059] In a possible implementation, the cylinder pin assembly 2 further comprises a packaging seat 202 and a first elastic member 203, the cylinder pin 201 is movably arranged in the packaging seat 202, the seat body 1 is further provided with a first mounting hole 104, the packaging seat 202 is assembled in the first mounting hole 104, and the first elastic member 203 is located between the bottom wall of the first mounting hole 104 and the cylinder pin 201. In this way, the cylinder pin assembly 2 is arranged, and only one-way movement of the cylinder pin 201 is driven to move outward by the hydraulic oil during the extension and retraction of the cylinder pin 201, and the movement of the cylinder pin 201 in the other direction is realized by the first elastic member 203. The structure is simple and reliable, and the structure of the cylinder pin assembly 2 can be effectively simplified.

[0060] Specifically, as shown in Figure 3 , the inside of the cylinder pin 201 is provided with a slot for inserting the first elastic member 203, and the first elastic member 203 is arranged in this form, which can effectively constrain the compression direction of the first elastic member 203, and improve the uniformity and reliability of the force of the first elastic member 203 on the cylinder pin 201.

[0061] In a possible implementation, as shown in Figure 3 , the guide hole 103 is in communication with the corresponding first mounting hole 104, the inner wall of the guide hole 103 has a first step surface, the first step surface forms a limiting surface 1031, the outer wall of the fitting member 5 has a second step surface, the second step surface forms a fitting surface 501, and the end of the fitting member 5 away from the connecting portion 403 has an avoiding groove 502 for avoiding the first elastic member 203. In this form, the guide hole 103 is longer, the length of the fitting member 5 can also be set longer, the reliability of the fitting and guiding of the guide hole 103 and the fitting member 5 is improved, and in addition, the avoiding groove 502 can ensure that the fitting member 5 avoids interference with the first elastic member 203 during movement.

[0062] In a possible implementation, the arm pin oil cylinder 3 comprises a cylinder body 302 and a second elastic member 303, the pin pulling driving end 301 is movably arranged in the cylinder body 302, the seat body 1 is further provided with a second mounting hole 105, the cylinder body 302 is assembled in the second mounting hole 105, the inner wall of the second mounting hole 105 has a third step surface, the second elastic member 303 is located between the third step surface and the connecting portion 403, and after the one-way movement of the pin pulling driving end 301 driven by the hydraulic oil in the cylinder body 302 is completed, the pin pulling driving end 301 can be reset by the second elastic member 303. The structure is simple and reliable.

[0063] Specifically, as shown in Figure 5 , the second mounting hole 105 is located on the second working surface 102, in order to better fix the arm pin oil cylinder 3, the cylinder body 302 is limited from moving towards the fitting seat 4 by the limiting member 304 assembled and connected with the third step surface, and one end of the second elastic member 303 is matched with the limiting member 304 and the other end is matched with the connecting portion 403.

[0064] In a possible implementation, the telescopic arm locking device further comprises a buffer assembly 6 arranged on both sides of the fitting seat 4 along the first direction, each buffer assembly 6 is elastically connected with the connecting part 403 on the side, the buffer assembly 6 can cooperate with the inner wall of the arm section during movement of the telescopic arm locking device, so as to prevent frequent friction and collision between other components of the telescopic arm locking device and the inner wall of the arm section, and the reliability and durability of the telescopic arm locking device can be improved.

[0065] According to the embodiments of the utility model, on the other hand, a telescopic arm system is provided, which comprises: a telescopic arm, the telescopic arm locking device and the telescopic driving assembly, the telescopic arm comprises a basic arm and a plurality of arm sections arranged in the basic arm and sequentially sleeved; the telescopic arm locking device is movably arranged in the telescopic arm; the telescopic driving assembly is connected with the seat body 1 of the telescopic arm locking device and is suitable for driving the arm section to stretch and retract along the third direction.

[0066] According to the embodiments of the utility model, on the other hand, a crane is provided, which comprises: the telescopic arm locking device or the telescopic arm system.

[0067] Although the embodiments of the utility model are described in combination with the drawings, those skilled in the art can make various modifications and changes without departing from the spirit and scope of the utility model, and such modifications and changes all fall within the scope defined by the appended claims.

Claims

1. A telescopic boom locking device, applied to a telescopic boom, the telescopic boom comprising a base arm and a plurality of boom sections disposed within the base arm and sequentially sleeved thereon, the boom sections being able to extend and retract relative to the base arm in a third direction under the action of a telescopic hydraulic cylinder, characterized in that, The telescopic arm locking device includes: The base (1) is fixed to the drive end of the telescopic cylinder of the telescopic arm; A cylinder pin assembly (2) includes a cylinder pin (201) disposed within the seat (1), the cylinder pin (201) being extendable from the seat (1) in a first direction and retractable into the seat (1); and Arm pin insertion / removal assembly; The arm pin insertion / removal assembly includes: Two sets of arm pin cylinders (3) are provided on the seat (1) and arranged along the first direction. The number of each set of arm pin cylinders (3) is at least two, and at least two arm pin cylinders (3) in each set of arm pin cylinders (3) are arranged along the third direction. The mating seat (4) is connected to the pin-pulling drive end (301) of the arm pin cylinder (3) so that it can move in a second direction away from or close to the seat body (1) under the drive of the arm pin cylinder (3). The mating part (5) is fixed at one end to the mating seat (4) between adjacent arm pin cylinders (3) arranged along the third direction, and the other end extends into the seat body (1) along the second direction. When the mating seat (4) is located close to the seat body (1), the mating part (5) abuts against the cylinder pin (201) to restrict the cylinder pin (201) from retracting into the seat body (1). Wherein, the first direction, the second direction, and the third direction are mutually perpendicular directions.

2. The telescopic arm locking device according to claim 1, characterized in that, The mating seat (4) includes a mating part (402) and two connecting parts (403). The mating part (402) includes a base plate (4021) and side plates (4022) connected to both sides of the base plate (4021). The base plate (4021) and the side plates (4022) on both sides form a slot (401). The two connecting parts (403) are located on both sides of the mating part (402) in the first direction and are connected to the corresponding side plates (4022). The connecting parts (403) are connected to the pin-pulling drive end (301) of a corresponding set of arm pin cylinders (3).

3. The telescopic arm locking device according to claim 2, characterized in that, The side panel (4022) includes a first plate segment (40221) and a second plate segment (40222) connected sequentially along a second direction. The first plate segment (40221) extends along the second direction and is connected to the bottom plate (4021). The second plate segment (40222) is bent toward the adjacent side panel (4022).

4. The telescopic arm locking device according to claim 2, characterized in that, The number of the mating parts (5) is two. There are two arm pin cylinders (3) in each group of arm pin cylinders (3). Each connecting part (403) has a first connecting position (4031) for connecting with the pin pull drive end (301) of the two arm pin cylinders (3). The connecting part (403) also has a second connecting position (4032) for connecting with one of the mating parts (5). The two first connecting positions (4031) of the connecting part (403) are spaced apart along the third direction. The second connecting position (4032) of the connecting part (403) is located between the two first connecting positions (4031).

5. The telescopic arm locking device according to any one of claims 2 to 4, characterized in that, The base (1) is provided with a guide hole (103), and the mating part (5) is movably inserted into the guide hole (103). The guide hole (103) is also provided with a limiting surface (1031). The mating part (5) is inserted into the guide hole (103) and has a mating surface (501) for mating with the limiting surface (1031).

6. The telescopic arm locking device according to claim 5, characterized in that, The cylinder pin assembly (2) further includes a sealing base (202) and a first elastic element (203). The cylinder pin (201) is movably inserted through the sealing base (202). The base body (1) is also provided with a first mounting hole (104). The sealing base (202) is assembled in the first mounting hole (104). The first elastic element (203) is located between the bottom wall of the first mounting hole (104) and the cylinder pin (201).

7. The telescopic arm locking device according to claim 6, characterized in that, The guide hole (103) communicates with the corresponding first mounting hole (104). The inner wall of the guide hole (103) has a first stepped surface, which forms the limiting surface (1031). The outer wall of the mating member (5) has a second stepped surface, which forms the mating surface (501). The end of the mating member (5) away from the connecting part (403) has a relief groove (502) for avoiding the first elastic member (203).

8. The telescopic arm locking device according to any one of claims 2 to 4, characterized in that, The arm pin cylinder (3) includes a cylinder body (302) and a second elastic element (303). The pin-pulling drive end (301) is movably inserted into the cylinder body (302). The seat (1) is also provided with a second mounting hole (105). The cylinder body (302) is assembled into the second mounting hole (105). The inner wall of the second mounting hole (105) has a third stepped surface. The second elastic element (303) is located between the third stepped surface and the connecting part (403). And / or, the telescopic arm locking device further includes a buffer assembly (6), which is disposed on both sides of the mating seat (4) along the first direction, and each buffer assembly (6) is elastically connected to the connecting part (403) on the side thereon.

9. A telescopic boom system, characterized in that, include: A telescopic boom includes a base arm and multiple boom segments disposed within the base arm and sequentially sleeved thereon; The telescopic arm locking device according to any one of claims 1 to 8 is movably disposed in the telescopic arm; The telescopic drive assembly is assembled and connected to the base (1) of the telescopic arm locking device, and is adapted to drive the arm segment to telescopically extend and retract in a third direction.

10. A crane, characterized in that, include: The telescopic arm locking device according to any one of claims 1 to 8, or the telescopic arm system according to claim 9.

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