Folding arm type hoisting structure
By designing a folding arm lifting structure, using articulated connections and composite motion control, the problem of inflexible joint connection between the crane and the accessories in the prior art is solved, and the lifting effect with high flexibility and safety is achieved.
Patent Information
- Application Number
- CN202420554689.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-03-21
AI Technical Summary
In the prior art, the coupling between the crane and the accessories is not flexible enough, and it is difficult to meet the high load and multifunctional needs, which affects the safety of the lifting.
A folding arm type hoisting structure is designed, and the precise position, height and angle adjustment of the hoisting part is achieved through the articulated connection between the basic arm, the main arm and the auxiliary arm, combined with the composite motion control of the first and second connections.
It realizes the flexibility and safety of the lifting structure, can be folded and stored in a small site, and quickly unfolded for large-scale lifting when needed, improving the convenience and safety of operation.
Smart Images
Figure CN222593293U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of folding arm cranes, in particular to a folding arm type hoisting structure. Background Art
[0002] Hoisting structures are widely used in ports, workshops, and construction sites for lifting and handling operations. The hoisting structure uses the end arm to support the wire rope to suspend the heavy objects, and also changes the lifting height and working radius by changing the length and inclination of the arm. The folding arm hoisting structure can fold the entire equipment when the hoisting structure is not in use, reducing the occupied volume and facilitating the reasonable design of other equipment on site.
[0003] A crane arm usually consists of a movable arm and attachments connected to the movable arm. The movable arms fold or extend, and the attachments grab materials. The overall connection of this structure is simple. However, with the development of various industries, the functional requirements of the crane arm are getting higher and higher, and the load requirements are gradually increasing. Therefore, the requirements for the connection between the crane arm and the attachments, flexibility and hoisting safety are gradually increasing. Utility Model Content
[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the matching structure in the prior art, thereby providing a folding arm type lifting structure.
[0005] The above technical objectives of the utility model are achieved through the following technical solutions:
[0006] A folding arm type lifting structure comprises a slewing base, a basic arm, a main arm member and a secondary arm member, wherein the basic arm is hingedly arranged on the slewing base, one end of the main arm member is connected to an end of the basic arm away from the slewing base, and the other end is hingedly arranged to the secondary arm member, a lifting member is connected to the secondary arm member, and further comprises a connecting member and a supporting member, wherein the connecting member comprises a first connection arranged at the hinge between the basic arm and the main arm member and a second connection arranged at the hinge between the main arm member and the secondary arm member, the bottom end of the supporting member is hingedly arranged on the slewing base and the other end is relatively slidably arranged on the outside of the main arm member.
[0007] By adopting the above technical scheme, the basic arm, the main arm part and the auxiliary arm part are hingedly arranged, so that they can be stored when folded, which is convenient for transfer and transportation, and hoisted and lifted when unfolded, which is easy to use; the first connection cooperates with the first driving cylinder to control the rotation between the basic arm and the main arm part, adjusts the angle between the two and makes the main arm part fold and fit the basic arm for storage, and the second connection cooperates with the second driving cylinder to control the rotation between the main arm part and the auxiliary arm part, adjusts the angle between the two and makes the auxiliary arm part fit the main arm part for storage, reducing the difficulty of adjusting the angle of the boom, and the purpose of accurately controlling the position, height and angle of the hoisting parts is achieved through the composite motion control of the first connection and the second connection, thereby completing the large-scale hoisting work after unfolding; the folding and storage of the basic arm, the main arm part and the auxiliary arm part can reduce the floor space, is suitable for small venues, and can be driven to unfold later, with high flexibility.
[0008] Furthermore, the basic arm is arranged on the side of the rotating base away from the support member, the rotating base is provided with a hinge groove relative to the basic arm, a limiting baffle is provided on the side of the hinge groove close to the support member, an accommodating groove is extended from the middle part of the rotating base, the width of the accommodating groove is greater than the width of the main arm member, and the support member is arranged on two opposite sides of the main arm member.
[0009] By adopting the above technical scheme, a hinge groove is opened on the slewing base corresponding to the basic arm. The basic arm can rotate in the hinge groove and is limited by the limit baffle in the hinge groove to prevent the basic arm from excessive movement and damaging the overall structure. The accommodating groove is used to store the main arm parts, so that there are two storage methods for the whole. One is the vertical storage of the basic arm, which minimizes the overall footprint; the other is the horizontal storage of the basic arm and the main arm parts, which is convenient for the subsequent inspection and replacement of the main arm parts and the auxiliary arm parts.
[0010] Furthermore, the main arm member includes a main arm frame and a telescopic frame, the width of the main arm frame is smaller than the width of the accommodating slot, the telescopic frame is slidably arranged in the main arm frame, one end of the main arm frame away from the telescopic frame is hinged to the basic arm through a first connection, and one end of the telescopic frame away from the main arm frame is hinged to the auxiliary arm member through a second connection.
[0011] By adopting the above technical solution, a retractable main arm is provided, and the sliding setting of the telescopic frame in the main arm frame can increase the length of the main arm, thereby increasing the subsequent lifting range and improving the adaptability of the lifting work.
[0012] Furthermore, a movable groove is opened on one side of the basic arm close to the main arm member, and a first driving cylinder is hingedly arranged in the movable groove, the bottom of the first driving cylinder is connected to the bottom of the movable groove, the top of the first driving cylinder is hinged to the first connection, the first connection includes a first rocker arm and a second rocker arm symmetrically arranged about the first driving cylinder, the first rocker arm is arranged on the outside of the second rocker arm, one end of the first rocker arm is hinged to the inner wall of the movable groove, and the other end is hinged to the top of the first driving cylinder, one end of the second rocker arm is hinged to the top of the first driving cylinder, and the other end is hinged to the bottom of the main arm frame.
[0013] By adopting the above technical solution, the movable groove accommodates the first drive cylinder and the first rocker arm and the second rocker arm in the fully stored state, thereby avoiding structural collision and interference during storage; when in use, the first drive cylinder can control a smaller amplitude to realize the movement of the main arm part, and the basic arm, the main arm part, the first rocker arm and the second rocker arm part constitute a connecting rod structure to realize the up and down swinging operation of the main arm part.
[0014] Furthermore, the telescopic frame is provided with an embedding groove at one end away from the main arm frame, and a second driving cylinder is arranged in the embedding groove, one end of the second driving cylinder is hinged to the embedding groove, and the other end of the second driving cylinder is hinged to the second connection drive, and a yield groove is also provided on the side wall of the telescopic frame corresponding to the second driving cylinder, and the second connection includes a first connecting rod and a second connecting rod symmetrically arranged about the second driving cylinder, the first connecting rod is arranged on the outside of the second connecting rod, one end of the first connecting rod is hinged to the outer side wall of the telescopic frame, and the other end is hinged to the output shaft of the second driving cylinder, one end of the second connecting rod is hinged to the output shaft of the second driving cylinder, and the other end is hinged to the auxiliary arm member, and a hinge plate extends from the auxiliary arm member close to the telescopic frame, and one end of the second connecting rod is hinged to the hinge plate.
[0015] By adopting the above technical solution, the embedding groove accommodates the second driving cylinder, and the giving way groove facilitates the movement of the first connecting rod and the second connecting rod and avoids the movement of the second driving cylinder, thereby avoiding structural collision interference; when in use, the second driving cylinder can control a smaller amplitude to realize the movement of the auxiliary arm part, and control the angle of the auxiliary arm part to realize end lifting.
[0016] Furthermore, a support member is slidingly provided on the outer side of the main boom, and the support member is arranged on two opposite sides of the main boom. The support member on each side includes a supporting telescopic cylinder and a supporting seat. The bottom of the supporting telescopic cylinder is hinged to the rotating base, and a card-embedding groove is opened on the rotating base corresponding to the telescopic cylinder. The output shaft of the supporting telescopic cylinder is hinged to the support seat, and the support seat is slidingly set on the side wall of the main boom.
[0017] By adopting the above technical solution, the support telescopic cylinder cooperates with the first driving cylinder to adjust the movement of the main arm. At the same time, the support member slidably arranged on the main arm frame can provide support for the main arm frame and the middle part of the telescopic frame after the telescopic frame is fully unfolded, thereby avoiding structural shaking caused by wind pressure and the like. When stored horizontally, the support telescopic cylinder can be arranged in the embedded groove, and the embedded groove provides protection for the support telescopic cylinder.
[0018] Furthermore, the support seat includes a U-shaped seat and a T-shaped sliding block, the U-shaped seat opening faces the supporting telescopic cylinder, the sliding block is fixed on the side of the U-shaped seat close to the main boom, the main boom is provided with a sliding seat corresponding to the support seat, the sliding seat is provided with a sliding groove for the sliding block to slide, and limit blocks are provided at both ends of the sliding seat.
[0019] By adopting the above technical solution, the support seat slides on the sliding seat as the support telescopic cylinder moves, so that as the opening angle between the main arm and the basic arm increases, the height of the support seat increases to facilitate adjustment of the overall center of gravity of the structure. After the telescopic frame is fully unfolded, the support seat can be close to the center of the main arm and the telescopic frame to ensure structural stability; the limit block now supports the movement of the support seat to avoid structural interference.
[0020] Furthermore, the lifting member includes a winding member, two fixed pulleys and a hook. The winding member is arranged in the auxiliary arm member. The fixed pulleys are positioned and rotatably installed at one end of the auxiliary arm member away from the main arm member. A twisted rope extends from the winding member and is connected to the hook. The twisted rope also passes around the two fixed pulleys.
[0021] By adopting the above technical solution, a lifting part is set on the auxiliary arm to reduce the stretching length of the rope, reduce the lifting shaking caused by the excessive length of the rope during lifting, and limit clamping is performed by two fixed pulleys to ensure that the rope is lifted smoothly, effectively improving the operational safety.
[0022] In summary, the technical solution of the utility model has the following advantages:
[0023] 1. The folding arm type lifting structure provided by the utility model is provided with a composite motion control of the first connection and the second connection to achieve the purpose of accurately controlling the position, height and angle of the lifting parts, thereby completing the large-scale lifting work after unfolding; the basic arm, the main arm part and the auxiliary arm part are folded and stored to reduce the occupied area, which is suitable for small venues and can be driven to unfold later, and has high flexibility.
[0024] 2. The folding arm lifting structure provided by the utility model is equipped with support parts to improve the safety during lifting. The supporting telescopic cylinder cooperates with the first driving cylinder to adjust the movement of the main arm. At the same time, the support parts slidably arranged on the main arm frame can provide support for the main arm frame and the middle part of the telescopic frame after the telescopic frame is fully unfolded, thereby avoiding structural shaking caused by wind pressure and the like.
[0025] 3. The folding arm lifting structure provided by the utility model is provided with a lifting part on the auxiliary arm part to reduce the stretching length of the twisted rope, reduce the lifting shaking caused by the twisted rope being too long during lifting, and limit clamping is performed through two fixed pulleys to ensure that the twisted rope is lifted smoothly, effectively improving the operational safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0027] Figure 1 It is a schematic diagram of the overall structure of a folding arm type lifting structure provided in one embodiment of the utility model;
[0028] Figure 2 A schematic diagram of a partial structure of a swivel base provided in one embodiment of the utility model;
[0029] Figure 3 A partial structural schematic diagram of a first connection provided in one embodiment of the utility model;
[0030] Figure 4 A schematic diagram of a partial structure of a second connection and a hoisting member provided in one embodiment of the utility model;
[0031] Figure 5 It is a schematic diagram of the local structure of a support member provided in one embodiment of the utility model.
[0032] Description of reference numerals:
[0033] 1. slewing base; 11. hinge groove; 111. limit baffle; 12. containing groove; 13. embedded groove; 2. basic arm; 21. movable groove; 211. first drive cylinder; 3. main arm member; 31. main arm frame; 311. sliding seat; 3111. sliding groove; 32. telescopic frame; 321. embedded groove; 3211. second drive cylinder; 3212. yielding groove; 4. auxiliary arm member; 41. hinge plate; 5. lifting member; 51. winding member; 511. twisted rope; 52. fixed pulley; 53. hook; 6. connecting member; 61. first connection; 611. first swing rod; 612. second swing rod; 62. second connection; 621. first connecting rod; 622. second connecting rod; 7. supporting member; 71. supporting telescopic cylinder; 72. supporting seat; 721. U-shaped seat; 722. sliding block. DETAILED DESCRIPTION
[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0035] A folding arm lifting structure, such as Figure 1 As shown, it includes a slewing base 1, a basic arm 2, a main arm member 3 and a secondary arm member 4. The basic arm 2 is hingedly arranged on the slewing base 1. One end of the main arm member 3 is connected to the end of the basic arm 2 away from the slewing base 1, and the other end is hingedly arranged with the secondary arm member 4. The secondary arm member 4 is connected with a hoisting member 5, and also includes a connecting member 6 and a supporting member 7. The connecting member 6 includes a first connection 61 arranged at the hinge of the basic arm 2 and the main arm member 3 and a second connection 62 arranged at the hinge of the main arm member 3 and the secondary arm member 4. The supporting member 7 is hingedly arranged on the slewing base 1 and the other end is relatively slidably arranged outside the main arm member 3. The basic arm 2, the main arm member 3 and the secondary arm member 4 are hingedly arranged, so that they can be stored when folded, which is convenient for transfer and transportation, and hoisted and lifted when unfolded, which is convenient for use.
[0036] like Figure 1 and Figure 3 As shown, the basic arm 2 is arranged on the side of the slewing base 1 away from the support 7, and the slewing base 1 is provided with a hinge groove 11 relative to the basic arm 2. A limit baffle 111 is provided on the side of the hinge groove 11 close to the support 7. The basic arm 2 can rotate in the hinge groove 11 and is limited by the limit baffle 111 in the hinge groove 11 to prevent the basic arm 2 from over-moving and damaging the overall structure. A receiving groove 12 is extended in the middle of the slewing base 1. The width of the receiving groove 12 is greater than the width of the main arm 3. The receiving groove 12 is used to accommodate the main arm 3, so that there are two ways of accommodating the whole. One is to store the basic arm 2 vertically, which minimizes the overall footprint; the other is to store the basic arm 2 and the main arm 3 horizontally, so as to facilitate the subsequent maintenance and replacement of the main arm 3 and the auxiliary arm 4 as a whole.
[0037] like Figure 1 , Figure 2 and Figure 4 As shown, the main arm member 3 includes a main arm frame 31 and a telescopic frame 32. The width of the main arm frame 31 is smaller than the width of the accommodating slot 12. The telescopic frame 32 is slidably arranged in the main arm frame 31. One end of the main arm frame 31 away from the telescopic frame 32 is hinged to the basic arm 2 through a first connection 61, and one end of the telescopic frame 32 away from the main arm frame 31 is hinged to the auxiliary arm member 4 through a second connection 62. The telescopic main arm member 3 is provided, and the telescopic frame 32 is slidably arranged in the main arm frame 31 to increase the length of the main arm member 3, thereby increasing the subsequent hoisting range and improving the adaptability of the hoisting work.
[0038] A movable groove 21 is provided on one side of the basic arm 2 close to the main arm member 3, and a first driving cylinder 211 is hingedly arranged in the movable groove 21. The bottom of the first driving cylinder 211 is connected to the bottom of the movable groove 21, and the top of the first driving cylinder 211 is hinged to the first connection 61. The first connection 61 includes a first swing rod 611 and a second swing rod 612 symmetrically arranged about the first driving cylinder 211. The first swing rod 611 is arranged on the outside of the second swing rod 612, one end of the first swing rod 611 is hinged to the inner wall of the movable groove 21, and the other end is hinged to the top of the first driving cylinder 211, one end of the second swing rod 612 is hinged to the top of the first driving cylinder 211, and the other end is hinged to the bottom of the main arm frame 31, and the main arm frame 31 is also provided with a groove for its movement corresponding to the second swing rod 612. The movable groove 21 accommodates the first driving cylinder 211 and the first rocker arm 611 and the second rocker arm 612 in the fully stored state to avoid structural collision and interference during storage; when in use, the first driving cylinder 211 can control a smaller amplitude to realize the movement of the main arm part 3, and the basic arm 2, the main arm part 3, the first rocker arm 611 and the second rocker arm 612 constitute a connecting rod structure to realize the up and down swinging operation of the main arm part 3.
[0039] A receiving groove 321 is provided at one end of the telescopic frame 32 away from the main arm frame 31, and a second driving cylinder 3211 is arranged in the receiving groove 321. One end of the second driving cylinder 3211 is hinged to the receiving groove 321, and the other end of the second driving cylinder 3211 is driven and hinged to the second connection 62. A yield groove 3212 is also provided on the side wall of the telescopic frame 32 corresponding to the second driving cylinder 3211. The second connection 62 includes a first connecting rod 621 and a second connecting rod 622 which are symmetrically arranged about the second driving cylinder 3211. The first connecting rod 621 is arranged on the outside of the second connecting rod 622. One end of the first connecting rod 621 is hinged to the outer wall of the telescopic frame 32, and the other end is hinged to the output shaft of the second driving cylinder 3211. One end of the second connecting rod 622 is hinged to the output shaft of the second driving cylinder 3211, and the other end is hinged to the auxiliary arm member 4. A hinge plate 41 is extended from the auxiliary arm member 4 close to the telescopic frame 32, and one end of the second connecting rod 622 is hinged to the hinge plate 41. The embedding groove 321 accommodates the second driving cylinder 3211, and the giving way groove 3212 facilitates the movement of the first connecting rod 621 and the second connecting rod 622 and avoids the movement of the second driving cylinder 3211 to avoid structural collision interference; when in use, the second driving cylinder 3211 can control a smaller amplitude to realize the movement of the auxiliary arm part 4, and control the angle of the auxiliary arm part 4 to realize end lifting.
[0040] The first connection 61 cooperates with the first driving cylinder 211 to control the rotation between the basic arm 2 and the main arm part 3, adjusts the angle between the two and makes the main arm part 3 complete the folding and fitting of the basic arm 2 for storage, and the second connection 62 cooperates with the second driving cylinder 3211 to control the rotation between the main arm part 3 and the auxiliary arm part 4, adjusts the angle between the two and makes the auxiliary arm part 4 fit the main arm part 3 for storage, reducing the difficulty of adjusting the boom angle. The purpose of accurately controlling the position, height and angle of the hoisting part 5 is achieved through the composite motion control of the first connection 61 and the second connection 62, thereby completing the large-scale hoisting work after unfolding.
[0041] like Figure 1 and Figure 5 As shown, a support member 7 is slidably provided on the outer side of the main boom 31, and the support member 7 is provided on two opposite sides of the main boom 31. Each side support member 7 includes a support telescopic cylinder 71 and a support seat 72. The bottom of the support telescopic cylinder 71 is hinged to the slewing base 1, and a clamping groove 13 is provided on the slewing base 1 corresponding to the telescopic cylinder. The output shaft of the support telescopic cylinder 71 is hinged to the support seat 72, and the support seat 72 is slidably provided on the side wall of the main boom 31. The support telescopic cylinder 71 cooperates with the first driving cylinder 211 to adjust the movement of the main boom 3. At the same time, the support member 7 slidably provided on the main boom 31 can provide support for the main boom 31 and the middle part of the telescopic frame 32 after the telescopic frame 32 is fully extended, so as to avoid the structural shaking caused by wind pressure and the like; when stored horizontally, the support telescopic cylinder 71 can be provided in the clamping groove 13, and the clamping groove 13 provides protection for the support telescopic cylinder 71.
[0042] The support seat 72 includes a U-shaped seat 721 and a T-shaped sliding block 722. The U-shaped seat 721 opens downward and toward the support telescopic cylinder 71. The sliding block 722 is fixed on the side of the U-shaped seat 721 close to the main boom 31. The main boom 31 is provided with a sliding seat 311 corresponding to the support seat 72. The sliding seat 311 is provided with a sliding groove 3111 for the sliding block 722 to slide. Both ends of the sliding seat 311 are provided with limit blocks, which can limit the movement of the support seat 72 to avoid structural interference. The support seat 72 slides on the sliding seat 311 as the support telescopic cylinder 71 moves, so that as the opening angle between the main arm 3 and the basic arm 2 increases, the height of the support seat 72 increases to facilitate the adjustment of the overall center of gravity of the structure. After the telescopic frame 32 is fully unfolded, the support seat 72 can be close to the center of the main boom 31 and the telescopic frame 32 to ensure structural stability.
[0043] like Figure 1 and Figure 4As shown, the hoisting member 5 includes a winding member 51, two fixed pulleys 52 and a hook 53. The winding member 51 is arranged in the auxiliary arm member 4. The fixed pulleys 52 are both positioned and rotatably installed at one end of the auxiliary arm member 4 away from the main arm member 3. The two fixed pulleys 52 are arranged up and down. A rope 511 extends from the side wall of the winding member 51 and is connected to the hook 53. The rope 511 also passes around the two fixed pulleys 52. The hoisting member 5 is arranged on the auxiliary arm member 4 to reduce the stretching length of the rope 511, reduce the hoisting shaking caused by the excessive length of the rope 511 during hoisting, and limit clamping is performed by the two fixed pulleys 52 to ensure that the rope 511 is hoisted smoothly, effectively improving the operation safety.
[0044] The working principle and use method of the folding arm lifting structure are as follows: a basic arm 2 and a support member 7 are hinged on a rotating base, the basic arm 2 is also hinged to a main arm member 3, the other end of the main arm member 3 is hinged to a secondary arm member 4, a lifting member 5 is provided on the secondary arm member 4, the lifting member 5 comprises a winding member 51, a fixed pulley 52 and a hook 53, a rope 511 extends from the winding member 51, passes through the fixed pulley 52 and fixes the hook 53 to realize lifting; a connecting member 6 is provided to ensure the safety of the connection, a first connection 61 is provided at the connection between the basic arm 2 and the main arm member 3 and comprises a first swing rod 611 and a second swing rod 612, a second connection 62 is provided at the connection between the main arm member 3 and the secondary arm member 4 and comprises a first connecting rod 621 and a second connecting rod 622; a support member 7 is provided to provide support for the retractable main arm member 3 and can be stored therewith.
[0045] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.
Claims
1. A folding arm type lifting structure, comprising a slewing base (1), a basic arm (2), a main arm member (3) and a secondary arm member (4), wherein the basic arm (2) is hingedly arranged on the slewing base (1), one end of the main arm member (3) is connected to an end of the basic arm (2) away from the slewing base (1), and the other end is hingedly connected to the secondary arm member (4), and the secondary arm member (4) is connected to a lifting member (5), characterized in that: It also comprises a connecting member (6) and a supporting member (7), wherein the connecting member (6) comprises a first connection (61) arranged at the hinge between the basic arm (2) and the main arm member (3) and a second connection (62) arranged at the hinge between the main arm member (3) and the auxiliary arm member (4), and the bottom end of the supporting member (7) is hingedly arranged on the slewing base (1) and the other end is relatively slidably arranged outside the main arm member (3).
2. A folding arm type lifting structure according to claim 1, characterized in that: The basic arm (2) is arranged on a side of the slewing base (1) away from the support member (7); the slewing base (1) is provided with a hinge groove (11) relative to the basic arm (2); a limit stopper (111) is provided on the side of the hinge groove (11) close to the support member (7); a receiving groove (12) is extended from the middle of the slewing base (1); the width of the receiving groove (12) is greater than the width of the main arm member (3); and the support member (7) is arranged on two opposite sides of the main arm member (3).
3. A folding arm type lifting structure according to claim 2, characterized in that: The main arm member (3) comprises a main arm frame (31) and a telescopic frame (32); the width of the main arm frame (31) is smaller than the width of the accommodating groove (12); the telescopic frame (32) is slidably arranged in the main arm frame (31); one end of the main arm frame (31) away from the telescopic frame (32) is hingedly arranged with the basic arm (2) via a first connection (61); and one end of the telescopic frame (32) away from the main arm frame (31) is hingedly arranged with the auxiliary arm member (4) via a second connection (62).
4. The folding arm type lifting structure according to claim 3, characterized in that: A movable groove (21) is provided on one side of the basic arm (2) close to the main arm member (3); a first driving cylinder (211) is hingedly arranged in the movable groove (21); the bottom of the first driving cylinder (211) is connected to the bottom of the movable groove (21); the top of the first driving cylinder (211) is hingedly connected to a first connection (61); the first connection (61) comprises a first swing rod (611) and a second swing rod (612) symmetrically arranged with respect to the first driving cylinder (211); the first swing rod (611) is arranged outside the second swing rod (612); one end of the first swing rod (611) is hingedly connected to the inner wall of the movable groove (21), and the other end is hingedly connected to the top of the first driving cylinder (211); one end of the second swing rod (612) is hingedly connected to the top of the first driving cylinder (211), and the other end is hingedly connected to the bottom of the main arm frame (31).
5. The folding arm type lifting structure according to claim 3, characterized in that: An end of the telescopic frame (32) away from the main arm frame (31) is provided with an embedding groove (321), a second driving cylinder (3211) is arranged in the embedding groove (321), one end of the second driving cylinder (3211) is hinged to the embedding groove (321), and the other end is drive-hinged to the second connection (62), a side wall of the telescopic frame (32) is further provided with a clearance groove (3212) corresponding to the second driving cylinder (3211), and the second connection (62) includes a first connecting rod (621) and a second connecting rod (621) symmetrically arranged with respect to the second driving cylinder (3211). Two connecting rods (622), the first connecting rod (621) is arranged on the outside of the second connecting rod (622), one end of the first connecting rod (621) is hinged to the outer side wall of the telescopic frame (32), and the other end is hinged to the output shaft of the second driving cylinder (3211), one end of the second connecting rod (622) is hinged to the output shaft of the second driving cylinder (3211), and the other end is hinged to the auxiliary arm member (4), and the auxiliary arm member (4) is extended with a hinge plate (41) on one side close to the telescopic frame (32), and one end of the second connecting rod (622) is hinged to the hinge plate (41).
6. The folding arm type lifting structure according to claim 3, characterized in that: A support member (7) is slidably arranged on the outside of the main boom (31), and the support member (7) is arranged on two opposite sides of the main boom (31). The support member (7) on each side comprises a supporting telescopic cylinder (71) and a supporting seat (72). The bottom of the supporting telescopic cylinder (71) is hinged to the slewing base (1), and a clamping groove (13) is provided on the slewing base (1) corresponding to the supporting telescopic cylinder (71). The output shaft of the supporting telescopic cylinder (71) is hinged to the supporting seat (72), and the supporting seat (72) is slidably arranged on the side wall of the main boom (31).
7. The folding arm type lifting structure according to claim 6, characterized in that: The support seat (72) comprises a U-shaped seat (721) and a T-shaped sliding block (722); the U-shaped seat (721) is opened toward the supporting telescopic cylinder (71); the sliding block (722) is fixed to the side of the U-shaped seat (721) close to the main boom (31); the main boom (31) is provided with a sliding seat (311) corresponding to the support seat (72); a sliding groove (3111) for the sliding block (722) to slide is provided on the sliding seat (311); and limit blocks are provided at both ends of the sliding seat (311).
8. The folding arm type lifting structure according to claim 1, characterized in that: The hoisting member (5) comprises a winding member (51), two fixed pulleys (52) and a hook (53); the winding member (51) is arranged in the auxiliary arm member (4); the fixed pulleys (52) are rotatably mounted on one end of the auxiliary arm member (4) away from the main arm member (3); a twisted rope (511) extends from the winding member (51) and is connected to the hook (53); the twisted rope (511) also passes around the two fixed pulleys (52).