Telescopic arm locking device, telescopic arm system and crane

Abstract

The invention 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 to 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 driving the clamping groove to move through the pin pulling driving end connected with the matching seat. 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 designing the cargo boom.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and in particular to a telescopic arm locking device, a telescopic arm system and a crane. Background Art

[0002] Single cylinder latch technology is one of the important technologies for cranes to achieve the process of boom extension and retraction. This technology achieves accurate locking and unlocking of each section of the boom through the coordination of the hydraulic cylinder and latch, the cylinder pin of the hydraulic cylinder itself and the locking and unlocking process of the hydraulic cylinder for the boom pin, ensuring that the boom can achieve the process of extension and retraction, and ensuring the stability and safety of the boom under different operating conditions.

[0003] The single-cylinder latch technology usually consists of a cylinder with a cylinder pin and an arm pin cylinder that can operate the arm pin. Currently, conventional cylinder pin cylinders and arm pin cylinders are usually arranged in sequence along the extension direction of the boom. This form of cylinder arrangement will occupy more space in the extension direction of the boom, which will affect the telescopic stroke of the boom. Summary of the invention

[0004] In view of this, the present invention provides a telescopic arm locking device, a telescopic arm system and a crane to solve the problem that the existing arrangement of the driving cylinder of the crane arm occupies a large space.

[0005] In the first aspect, the present invention provides a telescopic arm locking device, which is applied to the telescopic arm. The telescopic arm includes a basic arm and a plurality of arm sections arranged in the basic arm and arranged in sequence. The arm sections can be telescoped along a third direction relative to the basic arm under the drive of the telescopic oil cylinder. The telescopic arm locking device includes: a seat body, fixed to the driving end of the telescopic oil cylinder of the telescopic arm; a cylinder pin assembly, including a cylinder pin arranged in the seat body, the cylinder pin can extend out of the seat body in a first direction, and retract into the seat body; and an arm pin plug-in assembly; the arm pin plug-in assembly includes: two groups of arm pin oil cylinders, which are arranged in the seat body and arranged along the first direction, and each group of arm The number of pin cylinders is at least two, and there are at least two arm pin cylinders in each group of arm pin cylinders arranged along the third direction; the matching seat is connected to the pin pulling drive end of the arm pin cylinder so that it can move in the second direction away from the seat body or close to the seat body under the drive of the arm pin cylinder; the matching piece has one end fixed to the matching seat between adjacent arm pin cylinders arranged along the third direction, and the other end extending into the seat body along the second direction, and when the matching seat is located close to the seat body, the matching piece abuts against the cylinder pin to limit the cylinder pin from retracting into the seat body; wherein the first direction, the second direction and the third direction are directions perpendicular to each other.

[0006] Beneficial effect: The cylinder pin assembly and the arm pin plug-in assembly are integrated into the same seat body, and the cylinder pin assembly and the arm pin plug-in assembly are located on adjacent working surfaces. The cylinder pin assembly can control whether the locking device and the arm section are locked or not by moving the cylinder pin. After the card slot of the matching seat is sleeved onto the arm pin, the arm pin can be locked and unlocked by driving and moving the pin pulling driving end (301) directly connected to itself, and the matching piece arranged on the matching seat can limit the maximum unlocking moving distance of the matching seat. The overall volume of the device is small and can effectively reduce its own size along the telescopic direction of the telescopic arm, providing an additional telescopic stroke for the design of the lifting arm, and effectively solving the problem that the existing driving cylinder arrangement of the lifting arm occupies a large space.

[0007] In an optional embodiment, the mating seat includes a mating portion and two connecting portions, the mating portion includes a base plate and side plates connected to both sides of the base plate, the base plate and the side plates on both sides are combined to form a slot, the two connecting portions are located on both sides of the first direction of the mating portion and are connected to the corresponding side plates, and the connecting portions are connected to a corresponding set of pin pulling drive ends of an arm pin cylinder.

[0008] Beneficial effect: In this type of mating seat, both connecting parts are connected to the seat body through the arm pin oil cylinder, and the overall force of the mating seat is more uniform when working.

[0009] In an optional embodiment, the side panel includes a first panel segment and a second panel segment sequentially connected along the second direction, the first panel segment extends along the second direction and is connected to the bottom panel, and the second panel segment is bent toward a direction close to an adjacent side panel.

[0010] Beneficial effects: This type of side panel structure is simpler and more reliable, and is easy to process and manufacture.

[0011] In an optional embodiment, the number of mating parts is two, there are two arm pin cylinders in each group of arm pin cylinders, each connecting part has a first connecting position for connecting to the pin pulling drive ends of the two arm pin cylinders, and the connecting part also has a second connecting position for connecting to a mating part, the two first connecting positions of the connecting part are arranged at intervals along a third direction, and the second connecting position of the connecting part is located between the two first connecting positions.

[0012] Beneficial effect: This symmetrical arrangement of the mating piece and the arm pin cylinder can further improve the reliability of the mating seat during operation. In addition, it can also improve the uniformity of the force applied to the mating seat by the mating piece when limiting the position.

[0013] In an optional embodiment, a guide hole is provided on the seat body, and the matching piece is movably inserted into the guide hole. A limiting surface is also provided inside the guide hole. The matching piece is inserted into the guide hole and has a matching surface for matching with the limiting surface.

[0014] Beneficial effect: This form of limiting structure cooperates with the matching piece, so that the matching piece can not only limit the moving position of the matching seat, but also constrain the moving trajectory of the matching seat, which can effectively improve the stability of the working process of the matching seat.

[0015] In an optional embodiment, the cylinder pin assembly also includes a packaging seat and a first elastic member. The cylinder pin is movably inserted into the packaging seat. A first mounting hole is also provided on the seat body. The packaging seat is assembled in the first mounting hole. The first elastic member is located between the bottom wall of the first mounting hole and the cylinder pin.

[0016] Beneficial effect: When the cylinder pin assembly is arranged in this way, during the extension and retraction process of the cylinder pin, only the one-way movement process is carried out by the hydraulic oil driving the cylinder pin to move outward, while the movement of the cylinder pin in the other direction is carried out by the first elastic member. The method is simple and reliable and can effectively simplify the structure of the cylinder pin assembly.

[0017] In an optional embodiment, the guide hole is connected to 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 mating piece has a second step surface, the second step surface forms a mating surface, and the end of the mating piece away from the connecting part has an avoidance groove for avoiding the first elastic piece.

[0018] Beneficial effect: This type of guide hole is longer, so the length of the matching piece can also be set longer, which improves the reliability of the guide hole and the matching piece when they are guiding together. In addition, the avoidance groove can ensure that the movement process of the matching piece avoids interference with the first elastic piece.

[0019] In an optional embodiment, the arm pin cylinder includes a cylinder body and a second elastic member, the pin pulling driving end is movably arranged in the cylinder body, a second mounting hole is also arranged on the seat body, 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 member is located between the third step surface and the connecting part, and / or the telescopic arm locking device also includes a buffer assembly, the buffer assembly is arranged on both sides of the mating seat along the first direction, and each buffer assembly is elastically connected to the connecting part on one side.

[0020] Beneficial effect: After the hydraulic oil in the cylinder drives the pin-pulling driving end to move in one direction, the pin-pulling driving end can be driven to reset through the second elastic member, and the structure is simple and reliable.

[0021] In a second aspect, the present invention further provides a telescopic arm system, comprising: a telescopic arm, comprising a basic arm and a plurality of arm sections arranged in the basic arm and arranged in sequence; the above-mentioned telescopic arm locking device, movably arranged in the telescopic arm;

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

[0023] In a third aspect, the present invention further provides a crane, comprising: the telescopic arm locking device mentioned above, or the telescopic arm system mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A three-dimensional schematic diagram of a telescopic arm locking device according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A 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 at AA shown;

[0028] Figure 4 for Figure 2 A left side 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 is shown.

[0030] Description of reference numerals:

[0031] 1. seat body; 101. first working surface; 102. second working surface; 103. guide hole; 1031. limit surface; 104. first mounting hole; 105. second mounting hole;

[0032] 2. Cylinder pin assembly; 201. Cylinder pin; 202. Packaging seat; 203. First elastic member;

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

[0034] 4. Matching seat; 401. Card slot; 402. Matching part; 4021. Bottom plate; 4022. Side plate; 40221. First plate section; 40222. Second plate section; 403. Connecting part; 4031. First connecting position; 4032. Second connecting position;

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

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0037] Combine the following Figures 1 to 5 , describing an embodiment of the present invention.

[0038] According to an embodiment of the present invention, on the one hand, a telescopic arm locking device is provided, which is applied to a telescopic arm. The telescopic arm includes a basic arm and a plurality of arm sections which are arranged in the basic arm and are sequentially sleeved. The arm sections can be telescoped along a third direction relative to the basic arm under the drive of a telescopic oil cylinder. The telescopic arm locking device includes: a seat body 1, a cylinder pin assembly 2, and an arm pin plug-in 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 includes a cylinder pin 201 which is arranged in the seat body 1. The cylinder pin 201 can extend out of the seat body 1 along a first direction, and can be retracted into the seat body 1.

[0039] The arm pin plug-in and pull-out assembly includes: two groups of arm pin cylinders 3, a matching seat 4 and a matching piece 5. The two groups of arm pin cylinders 3 are arranged on the seat body 1 and arranged along the first direction. The number of arm pin cylinders 3 in each group is at least two, and there are at least two arm pin cylinders 3 in each group of arm pin cylinders 3 arranged along the third direction; the matching seat 4 is connected to the pin pulling drive end 301 of the arm pin cylinder 3 so that it can move away from the seat body 1 or close to the seat body 1 in the second direction under the drive of the arm pin cylinder 3; the matching piece 5 has one end fixed to the matching 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 matching seat 4 is located close to the seat body 1, the matching piece 5 abuts against the cylinder pin 201 to limit the cylinder pin 201 from retracting into the seat body 1;

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

[0041] The telescopic arm locking device of the present embodiment is applied, and the cylinder pin assembly 2 and the arm pin plug-in assembly are integrated into the same base body 1. The cylinder pin assembly 2 and the arm pin plug-in assembly are located on adjacent working surfaces. The cylinder pin assembly 2 can control whether the arm pin and the arm section are locked or not by moving the cylinder pin 201. After the slot 401 of the matching seat 4 is sleeved onto the arm pin, the arm pin can be locked and unlocked by driving the pin pulling drive end 301 directly connected to itself. The matching piece 5 arranged on the matching seat 4 can limit the maximum unlocking movement distance of the matching seat 4. The overall volume of the device is small and can effectively reduce its own size along the telescopic direction of the telescopic arm, which provides an additional telescopic stroke for the design of the crane arm, and effectively solves the problem of large space occupied by the existing driving cylinder arrangement of the crane arm.

[0042] It should be noted that the first direction refers to Figure 1 The arrow in the middle refers to the "first direction", and the second direction refers to Figure 1 The middle arrow points to the "second direction", and the third direction refers to Figure 1 The arrow in the middle points to the “third direction”.

[0043] Specifically, there is no limitation on the specific form of the card slot 401 in the mating seat 4. It can be a dovetail slot with an inverted trapezoidal cross-section of the space inside the slot, or a slot body with a "convex"-shaped cross-section of the space inside the slot, as long as the pin head of the arm pin can be set and the arm pin can be inserted and removed.

[0044] Furthermore, the two end surfaces of the seat body 1 along the first direction respectively form a first working surface 101, and one of the end surfaces of the seat body 1 along the second direction forms a second working surface 102. The cylinder pin assembly 2 is respectively 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 pin pulling drive end 301 can move along the second direction and extend out of the second working surface 102; the slot width of the slot 401 gradually decreases along the direction away from the seat body 1.

[0045] In addition, there is no limitation on the number of the arm pin cylinders 3 in each group of arm pin cylinders 3, and the number may be two, or more than two, such as three or four, and the number may be flexibly selected according to the needs.

[0046] In a possible embodiment, the mating seat 4 includes a mating portion 402 and two connecting portions 403, the mating portion 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 together form a card slot 401, the two connecting portions 403 are located on both sides of the first direction of the mating portion 402, and are connected to the corresponding side plates 4022, the connecting portions 403 are connected to the pin pulling driving ends 301 of a corresponding set of arm pin cylinders 3, in this form of mating seat 4, the two connecting portions 403 are connected to the seat body 1 through the arm pin cylinders 3, and the overall force of the mating seat 4 is more uniform when working.

[0047] Specifically, there is no strict limit on the number of arm pin cylinders 3 connected to each connection part 403 , and each connection part 403 can be connected to the seat body 1 through two or more arm pin cylinders 3 .

[0048] There is no limitation on the molding method of the mating portion 402 and the connecting portion 403. They may be an integral structure formed in one piece, or they may be separately molded parts connected through another connection process. The specific manufacturing method may be flexibly selected according to the needs.

[0049] In a possible embodiment, the side panel 4022 includes a first panel segment 40221 and a second panel segment 40222 connected in sequence along the second direction, the first panel segment 40221 extends along the second direction and is connected to the bottom panel 4021, and the second panel segment 40222 is bent in a direction close to the adjacent side panel 4022. This form of the side panel 4022 structure is simpler and more reliable, and is 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 spacing between the first plate segments 40221 of the two side plates 4022 is larger than the outer diameter of the arm pin head, and the spacing between the second plate segments 40222 of the two side plates 4022 is larger than the outer diameter of the arm pin rod and smaller than the outer diameter of the arm pin head.

[0051] Furthermore, if 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 to enter the slot 401, the second plate segment 40222 is chamfered at the corner near the adjacent side plate 4022.

[0052] There is no limitation on the specific method of chamfering, which can be a rounded corner or a straight angle.

[0053] In a possible embodiment, the number of 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 to the pin pulling drive ends 301 of the two arm pin cylinders 3, and the connecting part 403 also has a second connecting position 4032 for connecting to a mating part 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. This symmetrical arrangement of the mating parts 5 and the arm pin cylinders 3 can further improve the reliability of the mating seat 4 during operation. In addition, it can also improve the uniformity of the force applied to the mating seat 4 when the mating part 5 is limited.

[0054] Specifically, Figure 1 As shown, the first connection position 4031 and the second connection position 4032 are both connection structures that protrude toward one side of the connection portion 403 along the first direction.

[0055] Furthermore, the connection portion 403 is provided with through holes corresponding to the first connection position 4031 and the second connection position 4032 , and the matching piece 5 and the pin pulling driving end 301 are both inserted into the corresponding through holes and fixedly connected to the connection portion 403 through a fastening component.

[0056] As an alternative implementation, the matching piece 5 and the pin pulling driving end 301 may also be connected to the connecting portion 403 by 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 inserted into the guide hole 103, a limiting surface 1031 is further provided inside the guide hole 103, the matching piece 5 is inserted into the guide hole 103 and has a matching surface 501 for matching with the limiting surface 1031. This form of limiting structure cooperates with the matching piece 5, so that the matching piece 5 can not only play a role in limiting the moving position of the matching seat 4, but also can constrain the moving trajectory of the matching seat 4, which can effectively improve the stability of the working process of the matching seat 4.

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

[0059] In a possible embodiment, the cylinder pin assembly 2 further includes 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 during the extension and retraction process of the cylinder pin 201, only the one-way movement process is driven by hydraulic oil to move the cylinder pin 201 outward, while the movement of the cylinder pin 201 in the other direction is carried out by the first elastic member 203. The method is simple and reliable, and the structure of the cylinder pin assembly 2 can be effectively simplified.

[0060] Specifically, Figure 3 As shown, a slot for inserting the first elastic member 203 is provided inside the cylinder pin 201. Arranging the first elastic member 203 in this form can effectively restrict the compression direction of the first elastic member 203 and improve the uniformity and reliability of the force exerted by the first elastic member 203 on the cylinder pin 201.

[0061] In a possible implementation, Figure 3 As shown, the guide hole 103 is connected to 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 matching piece 5 has a second step surface, the second step surface forms a matching surface 501, and the end of the matching piece 5 away from the connecting portion 403 has an avoidance groove 502 for avoiding the first elastic piece 203. This form of guide hole 103 is longer, and the length of the matching piece 5 can also be set longer, thereby improving the reliability of the guide hole 103 and the matching piece 5 when they are matched and guided. In addition, the avoidance groove 502 can ensure that the movement process of the matching piece 5 avoids interference with the first elastic piece 203.

[0062] In a possible embodiment, the arm pin cylinder 3 includes a cylinder body 302 and a second elastic member 303, and the pin pulling drive end 301 is movably inserted into the cylinder body 302. A second mounting hole 105 is also provided on the base body 1, and 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, and the second elastic member 303 is located between the third step surface and the connecting part 403. After the hydraulic oil in the cylinder body 302 drives the pin pulling drive end 301 to move unidirectionally, the second elastic member 303 can drive the pin pulling drive end 301 to reset, and the structure is simple and reliable.

[0063] Specifically, Figure 5 As shown, the second mounting hole 105 is located on the second working surface 102. In order to better fix the arm pin cylinder 3, the cylinder body 302 is assembled with a limit piece 304 connected to the third step surface, thereby limiting its own movement tendency toward the mating seat 4. One end of the second elastic member 303 cooperates with the limit piece 304 and the other end cooperates with the connecting part 403.

[0064] In a possible embodiment, the telescopic arm locking device also includes a buffer assembly 6, which is arranged on both sides of the matching seat 4 along the first direction, and each buffer assembly 6 is elastically connected to the connecting portion 403 on the side where it is located. The buffer assembly 6 can cooperate with the inner wall of the arm section during the movement of the telescopic arm locking device, so as to prevent other components of the telescopic arm locking device from frequent friction and collision with the inner wall of the arm section and premature damage, thereby improving the reliability and durability of the telescopic arm locking device.

[0065] According to an embodiment of the present invention, on the other hand, a telescopic arm system is provided, which includes: a telescopic arm, the above-mentioned telescopic arm locking device and a telescopic drive assembly, the telescopic arm including a basic arm and a plurality of arm sections arranged in the basic arm and sequentially sleeved; the telescopic arm locking device movably arranged in the telescopic arm; the telescopic drive assembly is assembled and connected to the base body 1 of the telescopic arm locking device, and is suitable for driving the arm sections to telescope along a third direction.

[0066] According to an embodiment of the present invention, in another aspect, a crane is provided, which includes: the telescopic arm locking device mentioned above, or the telescopic arm system mentioned above.

[0067] Although the embodiments of the present invention have been 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 invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A telescopic arm locking device, applied to a telescopic arm, the telescopic arm comprising a basic arm and a plurality of arm sections arranged in the basic arm and sleeved in sequence, the arm sections being able to telescope along a third direction relative to the basic arm under the drive of a telescopic oil cylinder, characterized in that: The telescopic arm locking device comprises: A seat body (1) is fixed to the driving end of the telescopic cylinder of the telescopic arm; A cylinder pin assembly (2), comprising a cylinder pin (201) disposed in the seat body (1), wherein the cylinder pin (201) can extend out of the seat body (1) along a first direction and can be retracted into the seat body (1); and Arm pin plug-in assembly; The arm pin plug-in assembly comprises: Two groups of arm pin oil cylinders (3) are arranged on 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, and at least two arm pin oil cylinders (3) in each group of arm pin oil cylinders (3) are arranged along the third direction; A matching seat (4) is connected to the pin pulling driving end (301) of the arm pin oil cylinder (3) so as to move in a second direction away from the seat body (1) or towards the seat body (1) under the drive of the arm pin oil cylinder (3); A matching piece (5), one end of which is fixed to the matching seat (4) between the adjacent arm pin cylinders (3) arranged along the third direction, and the other end of which extends 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 cylinder pin (201) from retracting into the seat body (1); The first direction, the second direction and the third direction are directions perpendicular to each other.

2. The telescopic arm locking device according to claim 1, characterized in that: The mating seat (4) comprises a mating portion (402) and two connecting portions (403); the mating portion (402) comprises a bottom plate (4021) and side plates (4022) connected to both sides of the bottom plate (4021); the bottom plate (4021) and the side plates (4022) on both sides together form a card slot (401); the two connecting portions (403) are located on both sides of the mating portion (402) in the first direction and are connected to the corresponding side plates (4022); the connecting portions (403) are connected to a corresponding set of pin pulling drive ends (301) of the arm pin cylinders (3).

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

4. The telescopic arm locking device according to claim 2, characterized in that: The number of the matching parts (5) is two, and there are two arm pin cylinders (3) in each group of the arm pin cylinders (3). Each of the connecting parts (403) has a first connecting position (4031) for connecting to the pin pulling drive ends (301) of the two arm pin cylinders (3). The connecting part (403) also has a second connecting position (4032) for connecting to one matching part (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).

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

6. The telescopic arm locking device according to claim 5, characterized in that: The cylinder pin assembly (2) also includes a packaging seat (202) and a first elastic member (203), the cylinder pin (201) is movably inserted into the packaging seat (202), the seat body (1) is also 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).

7. The telescopic arm locking device according to claim 6, characterized in that: The guide hole (103) is connected to the corresponding first mounting hole (104); the inner wall of the guide hole (103) has a first step surface, the first step surface forms the limiting surface (1031); the outer wall of the matching piece (5) has a second step surface, the second step surface forms the matching surface (501); and the end of the matching piece (5) away from the connecting portion (403) has an avoidance groove (502) for avoiding the first elastic piece (203).

8. The telescopic arm locking device according to any one of claims 2 to 4, characterized in that: The arm pin oil cylinder (3) comprises a cylinder body (302) and a second elastic member (303); the pin pulling drive end (301) is movably inserted into the cylinder body (302); a second mounting hole (105) is further provided on the seat body (1); 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 / or, the telescopic arm locking device further comprises a buffer assembly (6), wherein the buffer assembly (6) is arranged on both sides of the matching seat (4) along the first direction, and each buffer assembly (6) is elastically connected to the connecting portion (403) on the side thereof.

9. A telescopic arm system, characterized in that: include: The telescopic arm comprises a basic arm and a plurality of arm sections which are arranged in the basic arm and sleeved in sequence; The telescopic arm locking device according to any one of claims 1 to 8, movably arranged in the telescopic arm; The telescopic drive assembly is assembled and connected with the base body (1) of the telescopic arm locking device and is suitable for driving the arm section to telescope along the 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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