Auxiliary arm connecting fork seat, cargo boom and operation machine

Abstract

The utility model relates to the technical field of operation machinery, in particular to a fly jib connecting fork seat, a cargo boom and operation machinery. The auxiliary arm connecting fork base comprises a base body, the base body is arranged at the auxiliary arm end of the cargo boom and provided with two symmetrically-arranged connecting fork structures, each connecting fork structure comprises two connecting fork parts matched with a main arm connecting fork head of the cargo boom, and the connecting fork parts are provided with positioning holes; the two groups of pin inserting and pulling mechanisms are respectively arranged on the two groups of fork connecting structures and are positioned between the two fork connecting parts, and each pin inserting and pulling mechanism comprises an upper pin shaft, a lower pin shaft and a linear driver, and the upper pin shaft and the lower pin shaft respectively point to the positioning holes of the two fork connecting parts; the plug pin mechanism has a locking state and an unlocking state; in the locking state, the linear driver drives the upper pin shaft and the lower pin shaft to be far away from each other so as to be inserted into the corresponding positioning holes respectively; in the unlocking state, the linear driver drives the upper pin shaft and the lower pin shaft to get close to each other so as to be separated from the corresponding positioning holes. According to the scheme, rapid, safe and automatic connection and fixation between the auxiliary arm and the main arm are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of operating machinery, in particular to a secondary arm fork seat, a lifting arm and an operating machinery. Background Art

[0002] In long-distance or high-altitude lifting operations, cranes often use jibs to significantly extend the lifting range. The jib is precisely connected to the main arm head through a slewing bearing, and then the jib rotates around the connection point so that the pin hole at the other end is precisely aligned with the corresponding position of the main arm.

[0003] However, in the existing jib fixing process, the key step of inserting the pin is still highly dependent on manual operation. Operators need to accurately align and force the pin in under complex working conditions, which is not only difficult to operate, but also poses significant safety hazards due to manual intervention in the heavy object installation process. Utility Model Content

[0004] The utility model provides a jib connecting fork seat, a lifting arm and an operating machine, which are used to solve the defects of the prior art that the manual installation of the jib pin shaft is difficult and has prominent safety hazards, and realize fast, safe and automatic connection and fixation between the jib and the main arm.

[0005] The utility model provides a jib fork seat, comprising: a seat body, arranged at the jib end of a crane arm, and having two groups of symmetrically arranged fork structures, wherein the fork structures include two fork parts matching with the main arm fork heads of the crane arm, and the fork parts are provided with positioning holes; two groups of plug-in and pull-out pin mechanisms, respectively arranged at the two groups of the fork structures, and located between the two fork parts, wherein the plug-in and pull-out pin mechanisms include an upper pin shaft and a lower pin shaft respectively pointing to the positioning holes of the two fork parts, and a linear driver; the plug-in and pull-out pin mechanism includes a locking state and an unlocking state; in the locking state, the linear driver drives the upper pin shaft and the lower pin shaft to move away from each other so as to be respectively inserted into the corresponding positioning holes; in the unlocking state, the linear driver drives the upper pin shaft and the lower pin shaft to move closer to each other so as to be respectively separated from the corresponding positioning holes.

[0006] According to a secondary arm fork seat provided by the utility model, the linear drive includes a cylinder body and a telescopic rod; the end of the cylinder body facing away from the telescopic rod is coaxially connected to the upper pin shaft; the end of the telescopic rod is coaxially connected to the lower pin shaft; in the locked state, the telescopic rod retracts into the cylinder body, and in the unlocked state, the telescopic rod extends out of the cylinder body.

[0007] According to the utility model, a secondary arm fork seat is provided, including a limiting mechanism, which includes a mounting seat and a limiting seat; the mounting seat is fixed to the seat body; the limiting seat is movably mounted on the mounting seat, and has the freedom to approach or move away from the linear drive in the horizontal direction; when the limiting seat is close to the linear drive, the limiting seat is respectively limited and cooperated with the cylinder body and the telescopic rod to position the telescopic state of the linear drive.

[0008] According to a jib fork seat provided by the utility model, the limit seat is provided with a guide rod, and the guide rod is slidably installed on the mounting seat; a spring member is sleeved on the guide rod, and the spring member is elastically supported between the mounting seat and the limit seat.

[0009] According to a secondary arm fork seat provided by the utility model, a pull ring is provided on a side of the limiting seat facing the mounting seat.

[0010] According to a secondary arm fork seat provided by the utility model, on the side facing the limiting seat, the cylinder body and the telescopic rod are respectively provided with a first limiting column; the limiting seat is provided with one or more limiting holes adapted to the first limiting column.

[0011] According to a secondary arm fork seat provided by the utility model, the plug-in pin mechanism includes an upper guide sleeve and a lower guide sleeve respectively fixed to the two fork portions of the same fork structure; the upper pin shaft and the lower pin shaft can slide through the upper guide sleeve and the lower guide sleeve respectively.

[0012] According to a secondary arm fork seat provided by the utility model, a long hole is arranged on the side of the upper guide sleeve, and a second limiting column matching the long hole is arranged on the side of the upper pin shaft.

[0013] The utility model also provides a lifting arm, comprising a main arm and a jib, wherein one end of the jib is provided with a jib fork seat as described in any one of the above embodiments, and the jib can be connected to the main arm through the jib fork seat.

[0014] The utility model also provides an operating machine, comprising the lifting arm as described above.

[0015] The utility model provides a jib fork seat, a crane arm and an operating machine. The jib fork seat effectively realizes the fast, safe and automatic connection and fixation between the jib and the main arm through precise alignment design, automatic plug-in and pull-out pin system and reliable locking and quick unlocking mechanism. In the locked state, the linear drive drives the upper pin and the lower pin to be inserted into the corresponding positioning holes respectively to form a stable pin connection, ensuring the connection strength and stability between the jib and the main arm. When the connection between the jib and the main arm needs to be released, the linear drive drives the upper pin and the lower pin to move inward synchronously and withdraw from the positioning hole to achieve fast and easy unlocking and separation without forced extraction by manpower, thus avoiding safety hazards caused by improper operation. The operation efficiency and safety of the crane arm and the operating machine when assembling the jib are significantly improved, solving the problem of traditional manual installation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is one of the structural schematic diagrams of the auxiliary arm fork seat provided by the utility model;

[0018] Figure 2 It is a schematic structural diagram of the unlocked state of the plug-in and pull-out pin mechanism of the auxiliary arm fork seat provided by the utility model;

[0019] Figure 3 It is a structural schematic diagram of the locking state of the plug-in and pull-out pin mechanism of the auxiliary arm fork seat provided by the utility model;

[0020] Figure 4 This is the second structural schematic diagram of the auxiliary arm fork seat provided by the utility model;

[0021] Figure 5 yes Figure 4 One of the partial enlarged pictures;

[0022] Figure 6 yes Figure 4 The second partial enlarged picture;

[0023] Figure 7 It is a structural schematic diagram of the lifting arm provided by the utility model;

[0024] Figure 8 It is a partial structural schematic diagram of the lifting arm provided by the utility model;

[0025] Reference numerals:

[0026] 10. seat body; 11. fork portion; 12. positioning hole; 21. upper pin shaft; 22. lower pin shaft; 23. cylinder body; 24. telescopic rod; 25. first limiting column; 26. second limiting column; 31. mounting seat; 32. limiting seat; 33. guide rod; 34. spring member; 35. pull ring; 36. limiting hole; 41. upper guide sleeve; 42. lower guide sleeve; 43. long hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should also be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0029] Combine the following Figure 1-Figure 6 The specific implementation of the auxiliary arm fork seat of the utility model is described.

[0030] The utility model provides a jib fork seat, comprising: a seat body 10, arranged at the jib end of a crane arm, having two groups of symmetrically arranged fork structures, the fork structures comprising two fork parts 11 matched with the main arm fork heads of the crane arm, the fork parts 11 being provided with positioning holes 12; two groups of plug-in and pull-out pin mechanisms, respectively arranged at the two groups of fork structures, located between the two fork parts 11, the plug-in and pull-out pin mechanisms comprising an upper pin shaft 21 and a lower pin shaft 22 pointing to the positioning holes 12 of the two fork parts 11 respectively, and a linear driver; the plug-in and pull-out pin mechanism comprises a locking state and an unlocking state; in the locking state, the linear driver drives the upper pin shaft 21 and the lower pin shaft 22 to move away from each other so as to be respectively inserted into the corresponding positioning holes 12; in the unlocking state, the linear driver drives the upper pin shaft 21 and the lower pin shaft 22 to move closer to each other so as to be respectively separated from the corresponding positioning holes 12.

[0031] Specifically, the base body 10 is installed at the end of the jib of the boom as the basic carrier of the overall structure. A pair of symmetrical fork structures are provided on the base body 10, each of which includes two fork parts 11 that precisely match the shape and size of the fork head of the main arm of the boom. These fork parts 11 are designed to fit tightly with the corresponding structure at the end of the main arm to ensure the stability of the connection between the jib and the main arm. A positioning hole 12 is preset on each fork part 11 for receiving and fixing a pin shaft to ensure that the fork part 11 and the main arm fork head maintain an accurate positional relationship after connection to prevent relative movement. The plug-in pin mechanism is respectively arranged in two groups of fork structures, located between the two fork parts 11 thereof, and includes an upper pin shaft 21 and a lower pin shaft 22, which are respectively facing the corresponding fork part 11 positioning holes 12. The plug-in pin mechanism controls the synchronous movement of the upper and lower pin shafts 22 through a linear drive.

[0032] The plug-in and pull-out pin mechanism has two working modes, a locked state and an unlocked state. In the locked state, the linear drive drives the upper pin 21 and the lower pin 22 to move outward at the same time, that is, to move away from each other, so that the two are accurately inserted into their respective corresponding positioning holes 12. At this time, the auxiliary arm and the main arm are firmly connected by the pins to form a stable docking structure that can withstand the load of the lifting operation. In the unlocked state, the linear drive acts in the opposite direction, causing the upper pin 21 and the lower pin 22 to move inward at the same time, that is, to move closer to each other and withdraw from the positioning hole 12. This state facilitates the separation of the auxiliary arm from the main arm, and is convenient for disassembly, adjustment or maintenance.

[0033] During the docking process between the main arm and the auxiliary arm, the auxiliary arm fork seat of the utility model can realize flexible operation and step-by-step locking during the docking process due to its unique two sets of symmetrically arranged fork structures and independent plug-in pin mechanisms. When the main arm fork head gradually approaches the auxiliary arm fork seat, the operator can timely start the corresponding plug-in pin mechanism, first insert the upper pin shaft 21 and the lower pin shaft 22 of one set of fork structures into the positioning hole 12, and enter the locking state to ensure that the joint on this side is firmly fixed. Subsequently, according to the docking condition of the fork head on the other side, the other set of plug-in pin mechanisms is timely started for locking. The step-by-step locking method not only ensures the accuracy of docking, but also improves the safety of the docking process.

[0034] The linear actuator may be an electric cylinder, a hydraulic cylinder, etc. Preferably, according to a jib fork seat provided by the utility model, the linear actuator includes a cylinder body 23 and a telescopic rod 24; one end of the cylinder body 23 facing away from the telescopic rod 24 is coaxially connected to the upper pin 21; the end of the telescopic rod 24 is coaxially connected to the lower pin 22; in the locked state, the telescopic rod 24 retracts into the cylinder body 23, and in the unlocked state, the telescopic rod 24 extends out of the cylinder body 23. Through the cooperation between the cylinder body 23 and the telescopic rod 24, and the coaxial connection design with the upper and lower pins 22, the automatic, rapid and accurate locking and unlocking of the jib and the main arm joint is achieved.

[0035] Specifically, the linear actuator mainly consists of a cylinder 23 and a telescopic rod 24. The upper pin 21 and the rear end of the cylinder 23 (the end facing away from the telescopic rod 24) are firmly fixed together by welding or mechanical structure (such as flange, key connection, spline, etc.) to maintain the consistency of coaxial rotation and linear motion. Similarly, the lower pin 22 and the end of the telescopic rod 24 are also coaxially connected in a similar manner to ensure that the two remain synchronized during the telescopic process. When the linear actuator is in a locked state, the telescopic rod 24 is retracted inside the cylinder 23, that is, it shrinks inside the cylinder 23. Since the upper pin 21 and the cylinder 23, and the lower pin 22 and the telescopic rod 24 are coaxially connected, this action will drive the upper and lower pins 22 to move inward synchronously, and withdraw from the positioning holes 12 of the auxiliary arm fork seat and the main arm connector respectively, so as to unlock the joint so as to install, adjust or disassemble the auxiliary arm. When the linear actuator is switched to an unlocked state, the telescopic rod 24 extends inside the cylinder 23, that is, extends to the outside of the cylinder 23. Similarly, this action will drive the upper and lower pin shafts 22 to move outward synchronously and insert into the positioning holes 12 of the auxiliary arm fork seat and the main arm connector respectively, so as to lock the joints and ensure that the auxiliary arm is firmly connected to the main arm and can withstand the load of the lifting operation.

[0036] According to the utility model, a jib fork seat includes a limiting mechanism, which includes a mounting seat 31 and a limiting seat 32; the mounting seat 31 is fixed to the seat body 10; the limiting seat 32 is movably mounted on the mounting seat 31, and has the freedom to approach or move away from the linear drive in the horizontal direction; when the limiting seat 32 is close to the linear drive, the limiting seat 32 is respectively limited and matched with the cylinder body 23 and the telescopic rod 24 to locate the telescopic state of the linear drive. By introducing the limiting mechanism, the stability and reliability of the telescopic state of the linear drive are enhanced.

[0037] The limiting mechanism consists of a mounting seat 31 and a limiting seat 32. The mounting seat 31 is fixed on the seat body 10 of the auxiliary arm fork seat as a supporting base for the limiting seat 32. The limiting seat 32 is designed to be movable in the horizontal direction relative to the mounting seat 31, and has the freedom to approach or move away from the linear drive (i.e., the cylinder body 23 and the telescopic rod 24). This movable design enables the limiting seat 32 to contact with a specific part of the linear drive when necessary to limit its telescopic stroke. In actual operation, when it is necessary to lock the telescopic state of the linear drive, that is, the upper and lower pins 22 are required to remain at a specific position inside or outside the positioning hole 12, the operator can control the movement of the limiting seat 32 by appropriate means (such as manual, pneumatic, electric, etc.). When the limiting seat 32 is close to the linear drive, it is limited and matched with a specific part of the cylinder body 23 and / or the telescopic rod 24 (such as the end face, boss, groove, etc.), that is, the linear drive is prevented from continuing to extend and retract through physical contact, thereby achieving accurate positioning of the telescopic state of the linear drive.

[0038] Further, according to a jib fork seat provided by the utility model, the limit seat 32 is provided with a guide rod 33, which is slidably mounted on the mounting seat 31; a spring member 34 is sleeved on the guide rod 33, and the spring member 34 is elastically supported between the mounting seat 31 and the limit seat 32. The guide rod 33 is slidably mounted along a slideway or a slide groove pre-set on the mounting seat 31. The function of the guide rod 33 is to provide an accurate and smooth movement guide for the limit seat 32, ensuring that it can move along a predetermined trajectory when it approaches or moves away from the linear drive in the horizontal direction. The spring member 34 is sleeved on the guide rod 33, and its two ends are elastically supported between the mounting seat 31 and the limit seat 32. When the limit seat 32 is pushed toward the linear drive by an external force (such as a manual operating force or a driving force of a gas or electric drive device), the spring member 34 will be compressed; when the external force is removed, the spring member 34 pushes the limit seat 32 back to the initial position by its own elastic restoring force, thereby realizing the automatic reset function. By adding the guide rod 33 and the spring member 34 , the limiting mechanism of the auxiliary arm fork seat of the utility model further improves the accuracy and stability of the limiting action while maintaining the original function.

[0039] According to a jib fork seat provided by the utility model, a pull ring 35 is provided on the side of the limit seat 32 facing the mounting seat 31. The operator can directly hold the pull ring 35 by hand, and by applying a pulling force in the direction away from the linear drive, the limit seat 32 slides along the guide rod 33 and then moves away from the linear drive. If remote control is required, the labor intensity of the operator is reduced, or when working in a special environment, a traction device (such as a rope, chain, hydraulic or electric pull rod, etc.) can be installed to connect to the pull ring 35. By manipulating the traction device, the limit seat 32 can be remotely and labor-savingly operated, so that the limit seat 32 is away from the linear drive, and operations such as unlocking or adjustment are completed.

[0040] According to the auxiliary arm fork seat provided by the utility model, the cylinder body 23 and the telescopic rod 24 are respectively provided with a first limiting column 25 on the side facing the limiting seat 32; the limiting seat 32 is provided with one or more limiting holes 36 adapted to the first limiting column 25. By adding the first limiting column 25 to the cylinder body 23 and the telescopic rod 24, and providing matching limiting holes 36 on the limiting seat 32, accurate and stable limiting of the telescopic state of the linear drive is achieved.

[0041] Preferably, the limit seat 32 is set as an arc-shaped plate-like structure, and its profile is adapted to the side shape of the linear actuator (i.e., the cylinder body 23 and the telescopic rod 24), so that the limit seat 32 can fit closely to its surface when it is close to the linear actuator, thereby improving the stability of the limiting effect. Preferably, at least two limit holes 36 are provided on the limit seat 32, corresponding to the locking state of the plug-in pin mechanism. When the linear actuator is in the locked state, the first limit column 25 can be accurately embedded in the corresponding limit hole 36 to achieve accurate locking of the telescopic state of the linear actuator. The upper and lower ends of the limit seat 32 are preferably respectively provided with U-shaped grooves adapted to the first limit column 25. When the plug-in pin mechanism is in the unlocked state, the limit seat 32 automatically retreats under the action of the spring member 34, and at this time, the first limit column 25 just falls into the U-shaped groove. The limit seat 32 is supported between the cylinder body 23 and the first limit column 25 of the telescopic rod 24 with the U-shaped grooves at its upper and lower ends to reliably maintain the locking state of the plug-in pin mechanism.

[0042] According to a sub-arm fork seat provided by the utility model, the plug-in and pull-out pin mechanism comprises an upper guide sleeve 41 and a lower guide sleeve 42 respectively fixed to two fork portions 11 of the same fork structure; the upper pin shaft 21 and the lower pin shaft 22 respectively slide through the upper guide sleeve 41 and the lower guide sleeve 42. The upper guide sleeve 41 and the lower guide sleeve 42 respectively fixed to two fork portions 11 of the same fork structure in the plug-in and pull-out pin mechanism are firmly connected to the main body of the fork portion 11 to form a constraint channel for the radial movement of the upper and lower pin shafts 22. The upper and lower guide sleeves 42 are used to ensure the radial stability of the upper and lower pin shafts 22 during operation to prevent them from accidentally leaving the fork structure.

[0043] Further, according to a jib fork seat provided by the utility model, an elongated hole 43 is provided on the side of the upper guide sleeve 41, and a second limiting column 26 matching the elongated hole 43 is provided on the side of the upper pin 21. Through the cooperation of the elongated hole 43 and the second limiting column 26, the axial movement range of the upper pin 21 is effectively limited, ensuring that the upper pin 21 can only slide within a set range. The jib fork seat effectively limits the axial movement range of the upper pin 21 by adding an elongated hole 43 to the upper guide sleeve 41 and cooperating with the second limiting column 26.

[0044] Combine the following Figure 7 and Figure 8 The crane arm and the operating machine provided by the utility model are described. The crane arm and the operating machine described below and the auxiliary arm fork seat described above can correspond to each other.

[0045] The utility model also provides a crane arm, including a main arm and a jib, one end of the jib is provided with a jib fork seat of any one of the above embodiments, and the jib can be connected to the main arm through the jib fork seat. The jib fork seat of the utility model, by virtue of its two sets of symmetrically arranged fork structures and independently controllable plug-in and pull-out pin mechanisms, endows the main arm and jib with extremely high flexibility and adaptability in the docking process. The operator can operate the two sets of plug-in and pull-out pin mechanisms respectively according to the actual docking progress, and lock the fork structures of the main arm fork head and the jib fork seat in sequence or synchronously, so as to ensure efficient, accurate and safe docking. When there is no need to lengthen the boom, the jib can be mounted on one side of the main arm; when the boom needs to be lengthened, such as Figure 7 As shown, first connect the fork structure on one side, then use the plug-in pin mechanism to lock it, and then Figure 8 As shown, the fork structure on the other side is docked and locked using a plug-in pin mechanism to complete the docking of the main arm and the auxiliary arm.

[0046] The utility model also provides an operating machine, including the above-mentioned lifting arm. The operating machine of the utility model can include various types of mechanical equipment such as cranes, aerial work platforms, port machinery, fire rescue vehicles, forestry machinery, special transport vehicles, and construction machinery. By applying the improved auxiliary arm fork seat, the efficiency, safety, and operating convenience of these equipment in their respective operating fields are improved.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A jib fork seat, characterized in that: include: The seat body (10) is arranged at the end of the auxiliary arm of the crane arm, and has two groups of symmetrically arranged fork structures, wherein the fork structures include two fork parts (11) matching with the main arm fork heads of the crane arm, and the fork parts (11) are provided with positioning holes (12); Two groups of plug-in and pull-out pin mechanisms are respectively arranged on the two groups of the fork-joining structures and located between the two fork-joining parts (11), the plug-in and pull-out pin mechanisms comprising an upper pin shaft (21) and a lower pin shaft (22) respectively pointing to the positioning holes (12) of the two fork-joining parts (11), and a linear drive; The plug-in pin mechanism includes a locked state and an unlocked state; In the locked state, the linear drive drives the upper pin shaft (21) and the lower pin shaft (22) to move away from each other so as to be inserted into the corresponding positioning holes (12) respectively; In the unlocked state, the linear drive drives the upper pin shaft (21) and the lower pin shaft (22) to move closer to each other so as to respectively disengage from the corresponding positioning holes (12).

2. The auxiliary arm fork seat according to claim 1, characterized in that: The linear actuator comprises a cylinder (23) and a telescopic rod (24); One end of the cylinder body (23) facing away from the telescopic rod (24) is coaxially connected to the upper pin shaft (21); The end of the telescopic rod (24) is coaxially connected to the lower pin shaft (22); In the locked state, the telescopic rod (24) is retracted into the cylinder (23), and in the unlocked state, the telescopic rod (24) is extended out of the cylinder (23).

3. The auxiliary arm fork seat according to claim 2, characterized in that: It comprises a limiting mechanism, wherein the limiting mechanism comprises a mounting seat (31) and a limiting seat (32); The mounting seat (31) is fixed to the seat body (10); The limiting seat (32) is movably mounted on the mounting seat (31) and has the freedom to move closer to or farther from the linear drive in a horizontal direction; When the limiting seat (32) is close to the linear actuator, the limiting seat (32) is respectively limitedly matched with the cylinder body (23) and the telescopic rod (24) to position the telescopic state of the linear actuator.

4. The auxiliary arm fork seat according to claim 3, characterized in that: The limiting seat (32) is provided with a guide rod (33), and the guide rod (33) is slidably mounted on the mounting seat (31); The guide rod (33) is sleeved with a spring component (34), and the spring component (34) is elastically supported between the mounting seat (31) and the limiting seat (32).

5. The auxiliary arm fork seat according to claim 4, characterized in that: A pull ring (35) is provided on one side of the limiting seat (32) facing the mounting seat (31).

6. The auxiliary arm fork seat according to claim 3, characterized in that: On the side facing the limiting seat (32), the cylinder body (23) and the telescopic rod (24) are respectively provided with a first limiting column (25); and the limiting seat (32) is provided with one or more limiting holes (36) adapted to the first limiting column (25).

7. The auxiliary arm fork seat according to any one of claims 1 to 6, characterized in that: The plug-in and pull-out pin mechanism comprises an upper guide sleeve (41) and a lower guide sleeve (42) respectively fixed to two fork-jointing parts (11) of the same fork-jointing structure; The upper pin shaft (21) and the lower pin shaft (22) can slide through the upper guide sleeve (41) and the lower guide sleeve (42) respectively.

8. The auxiliary arm fork seat according to claim 7, characterized in that: The side surface of the upper guide sleeve (41) is provided with an elongated hole (43), and the side surface of the upper pin shaft (21) is provided with a second limiting column (26) matching the elongated hole (43).

9. A lifting arm, characterized in that: It comprises a main arm and a secondary arm, wherein one end of the secondary arm is provided with a secondary arm fork seat as claimed in any one of claims 1 to 8, and the secondary arm can be connected to the main arm through the secondary arm fork seat.

10. A working machine, characterized in that: Comprising the lifting arm as claimed in claim 9.

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