Fork structure of a forklift truck

Abstract

The application provides a structure of a forklift, comprising a mounting seat, two groups of forklift units installed through adjusting components and slidably arranged on the mounting seat, a horizontal moving seat, a movable fork slidably arranged at the end of the horizontal moving seat, a driving mechanism arranged on the horizontal moving seat and used to drive the movable fork to slide, a plurality of groups of extension forks horizontally and side by side arranged at the end of the horizontal moving seat, and a lifting mechanism arranged on the movable fork and connected with the plurality of groups of extension forks. The sliding of the movable fork is converted into the lifting of the plurality of groups of extension forks in sequence through the lifting mechanism to fill the gap between the horizontal moving seat and the movable fork. A fixing mechanism is arranged on the extension fork and connected with the movable fork. The structure of the forklift can flexibly expand the supporting length in the longitudinal and horizontal directions, can automatically fill the gap between the horizontal moving seat and the movable fork, can ensure the continuity and flatness of the supporting surface, can adjust the supporting range, and can effectively avoid the overturning of the center of gravity of the large-volume goods.

Description

Technical Field

[0001] This invention specifically relates to a fork structure for a crane forklift. Background Technology

[0002] Forklifts are mainly used in warehouses, workshops, ports, and other similar settings. They use a mast to drive the forks to lift and lower goods, enabling loading, unloading, and stacking operations. They can also transport pallets, boxes, and large, heavy objects over short distances. Their core function is to replace manual handling and improve the efficiency of goods handling and storage.

[0003] For example, Chinese invention patent CN111517246B provides a portable hand-held electric forklift. The forklift uses a first frame as a load-bearing mechanism and adds a second frame that moves relative to the first frame. The goods are placed on the front forks of the second frame. When the drive assembly is activated, the end of the lifting arm near the first frame rotates around the first connecting rod, and the end of the lifting arm away from the first connecting rod lifts the second frame to lift the goods to be transported on the second frame.

[0004] However, most existing forklifts use a fixed fork structure, with the fork length and the spacing between the two sets of forks remaining constant. This design only supports and lifts goods with specific bottom dimensions. In actual operating scenarios, there are significant differences between the volume and bottom area of ​​goods. When faced with large, wide, or extra-long goods, the support range of traditional fixed forks cannot be flexibly adjusted, resulting in only a portion of the bottom surface of the goods being supported.

[0005] In this situation, the center of gravity of the goods is prone to deviate from the fork support center, which not only causes the goods to tilt and slip, but also causes the forklift to become unbalanced, leading to a rollover accident and seriously threatening the safety of operators and property. In view of this, a fork structure for a lifting forklift is proposed to solve the above problems. Summary of the Invention

[0006] Therefore, it is necessary to address the issue that most existing forklifts have fixed fork structures with non-adjustable support ranges, which limits their ability to lift goods with a limited bottom area. When the goods are large, the existing fork structures cannot expand the support range for the bottom surface of the goods, making the forklift prone to tipping over due to the shift in the center of gravity of the goods. Therefore, it is necessary to provide a fork structure for a forklift.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a fork structure for a lifting forklift, comprising a mounting base, on which two sets of fork units are slidably disposed, each fork unit being mounted via an adjusting assembly, the fork unit comprising: Lateral sliding seat; A movable fork is slidably disposed at the end of the transverse base, and the transverse base is provided with a drive mechanism for driving the movable fork to slide. Multiple sets of extension forks are provided and arranged side by side laterally at the end of the transverse sliding seat. The multiple sets of extension forks and the transverse sliding seat are connected in a height-adjustable manner. A lifting mechanism, disposed on the movable fork and connected to multiple sets of the extension forks, converts the sliding of the movable fork into driving the multiple sets of extension forks to rise and fall sequentially to fill the gap between the transverse support and the movable fork; and A fixing mechanism is provided on the extension fork and connected to the movable fork, so as to selectively lock or unlock the position of the extension fork after the extension fork rises to be flush with the movable fork.

[0008] In one embodiment, the adjustment component includes: A positioning rod is mounted on the mounting base, and both sets of the transverse sliding seats are slidably sleeved on the positioning rod; and A bidirectional lead screw is rotatably mounted on the mounting base, and the threads at both ends of the screw are respectively screwed to the two sets of transverse sliding seats.

[0009] In one embodiment, a first receiving rod is provided at the bottom of the transverse seat, and a second receiving rod is provided at the bottom of the movable fork. The second receiving rod is slidably disposed on the first receiving rod, and the extension fork is located between the movable fork and the second receiving rod when it is not raised.

[0010] In one embodiment, both the extension fork and the transverse seat have grooves at their ends, and the extension fork has a slider at its end, which is engaged in a corresponding set of grooves.

[0011] In one embodiment, the drive mechanism includes: The push frame has a sliding frame at the bottom of the movable fork, and the push frame is slidably disposed within the sliding frame; The first elastic element is disposed between the push frame and the inner wall of the slide frame; The drive seat is connected to the push frame via a connecting frame; A threaded rod, rotatably disposed at the bottom of the transverse support, and screwed to the drive seat; and The guide rod is fixedly installed at the bottom of the transverse seat and is slidably connected to the drive seat.

[0012] In one embodiment, a first gear is provided at the end of the threaded rod, and a second gear is rotatably provided at the bottom of the movable fork, the second gear meshing with the first gear.

[0013] In one embodiment, the bottom of the movable fork is provided with two sets of guide grooves, and a support seat is slidably disposed in the guide groove. One set of the support seats is rotatably connected to the threaded rod, and the other set of support seats is fixedly connected to the guide rod.

[0014] In one embodiment, the lifting mechanism includes: Upright plates are provided at the bottom of the extension fork, and two sets are arranged at intervals. The two sets of upright plates are mounted on the first supporting rod. An inclined rail is provided on one side of the upright plate, and both ends of the inclined rail are connected to a horizontal rail. One set of the horizontal rail passes through the upright plate. A drive column, mounted on the drive seat, and slidable into the flat track; and A stop is provided at the bottom of the transverse seat, and a spring is provided between it and the extension fork.

[0015] In one embodiment, the fixing mechanism includes: The first wedge block is slidably disposed at the bottom of the extension fork. Both the extension fork and the transverse seat have a fixing groove on one side. After the extension fork rises, the end of the first wedge block can be locked in the fixing groove. The first wedge block has an inclined groove. A push block is slidably disposed at the bottom of the extension fork, and its sliding direction is perpendicular to the sliding direction of the first wedge block. A control post is provided on the push block, and the control post is slidably engaged in the inclined groove. A second wedge-shaped block is disposed at the end of the push block, and a push rod is disposed on the push frame, the push rod being capable of abutting against the inclined surface of the second wedge-shaped block; and A baffle is fixedly installed at the bottom of the extension fork, and a second elastic element is provided between it and the first wedge block.

[0016] In one embodiment, the width of the second wedge block is not less than the lifting distance of the extension fork.

[0017] Compared with the prior art, the present invention has at least the following advantages: This device drives two sets of fork units to slide laterally via an adjustment component, adapting to the support requirements of goods of different widths and avoiding center of gravity shift caused by unilateral force. The sliding cooperation between the movable fork and the transverse seat, combined with multiple sets of liftable extension forks, can flexibly expand the longitudinal support length, solving the problem of insufficient support for large-volume goods. It can also convert the sliding of the movable fork into driving multiple sets of extension forks to rise and fall sequentially through the lifting mechanism, automatically filling the gap between the movable fork and the transverse seat, ensuring a continuous and flat support surface, and effectively dispersing the pressure of the goods. After the extension fork rises to be flush with the movable fork, its position is locked by a fixing mechanism to ensure structural stability during lifting, effectively reducing the risk of tipping over due to center of gravity shift caused by insufficient support, while improving the safety of lifting operations and expanding the applicable scenarios of the forklift. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 A three-dimensional structural diagram of the fork structure of a lifting forklift provided by the present invention; Figure 2 This is a schematic diagram of the bottom structure of the fork unit in the fork structure of a lifting forklift according to the present invention; Figure 3 This is a schematic diagram of the bottom structure of the transverse sliding seat in the fork structure of a lifting forklift according to the present invention; Figure 4 This is a schematic diagram of the bottom surface structure of the movable fork in the fork structure of a lifting forklift according to the present invention; Figure 5 This is a schematic diagram of the bottom surface structure of the extension fork in the fork structure of a lifting forklift according to the present invention; Figure 6 for Figure 5 Enlarged view of region A in the middle; Figure label: 1. Mounting base; 2. Positioning rod; 3. Two-way lead screw; 4. Transverse sliding seat; 5. First receiving rod; 6. Fixing groove; 7. Guide rod; 8. Threaded rod; 9. Support base; 10. First gear; 11. Second gear; 12. Movable fork; 13. Guide groove; 14. Push rod; 15. Second receiving rod; 16. Sliding frame; 17. Push frame; 18. First elastic element; 19. Connecting frame; 20. Drive seat; 21. Drive column; 22. Extension fork; 23. Vertical plate; 24. Inclined track; 25. Flat track; 26. Sliding groove; 27. Sliding block; 28. First wedge block; 29. ​​Inclined groove; 30. Push block; 31. Control column; 32. Second wedge block; 33. Baffle; 34. Second elastic element; 35. Stop frame. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention; therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0023] Example: Please see Figure 1 The present invention provides a fork structure for a lifting forklift, including a mounting base 1. Two sets of fork units are slidably mounted on the mounting base 1 and installed by an adjustment component. Each fork unit includes a transverse seat 4, and a movable fork 12 is slidably mounted at the end of the transverse seat 4. The adjustment component includes a positioning rod 2 mounted on the mounting base 1. Both sets of transverse seats 4 are slidably sleeved on the positioning rod 2. A bidirectional lead screw 3 is rotatably mounted on the mounting base 1, and the threads at both ends of the bidirectional lead screw 3 are screwed to the two sets of transverse seats 4 respectively.

[0024] This device allows the mounting base 1 to be installed on the lifting end (such as a hydraulic rod or lead screw slider) of a forklift. By controlling the lifting of the mounting base 1, the traverse seat 4 and the movable fork 12 are lifted to raise the load. The distance between the two sets of movable forks 12 can be adjusted by rotating the bidirectional lead screw 3 to make the two sets of traverse seats 4 slide in opposite directions, so that the movable forks 12 are as close as possible to both ends of the load, thereby accommodating the lifting of loads of different widths.

[0025] Please see Figure 3 , 4In this embodiment, the transverse base 4 is provided with a driving mechanism for sliding the movable fork 12. The driving mechanism includes a pusher 17, a sliding frame 16 at the bottom of the movable fork 12, the pusher 17 being slidably disposed within the sliding frame 16, a first elastic element 18 being disposed between the pusher 17 and the inner wall of the sliding frame 16, and a driving seat 20 being connected to the pusher 17 via a connecting frame 19. A threaded rod 8 is rotatably disposed at the bottom of the transverse base 4, and the threaded rod 8 is screwed to the driving seat 20. A guide rod 7 is fixedly disposed at the bottom of the transverse base 4, and the guide rod 7 is slidably connected to the driving seat 20. Multiple sets of extension forks 22 are arranged horizontally side by side at the end of the transverse base 4, and the multiple sets of extension forks 22 and the transverse base 4 are all connected in a liftable manner. A first gear 10 is disposed at the end of the threaded rod 8, and a second gear 11 is rotatably disposed at the bottom of the movable fork 12, and the second gear 11 meshes with the first gear 10.

[0026] The second gear 11 can be rotated electrically or manually, which in turn drives the threaded rod 8 to rotate through meshing with the first gear 10. During the rotation of the threaded rod 8, the pusher 17 can be driven to slide through the cooperation of the drive seat 20. When the pusher 17 slides away from the transverse seat 4, the movable fork 12 can be driven to slide by pushing one end of the slide frame 16. The bottom of the transverse seat 4 is provided with a first support rod 5, and the bottom of the movable fork 12 is provided with a second support rod 15. The second support rod 15 is slidably mounted on the first support rod 5. When the extension fork 22 is not raised, it is located between the movable fork 12 and the second support rod 15. The sliding of the movable fork 12 can be guided by the cooperation of the first support rod 5 and the second support rod 15, so that the movable fork 12 and the transverse seat 4 form an integrated load-bearing structure, thereby improving its load-bearing performance. When the pusher 17 slides toward the direction of the transverse seat 4, the movable fork 12 can be reset by the first elastic element 18. If there is an extension fork 22 between the movable fork 12 and the transverse seat 4, the first elastic element 18 can be compressed. After the extension fork 22 descends, the movable fork 12 can be controlled to move laterally and retract by the first elastic element 18.

[0027] Please see Figures 3 to 5 In this embodiment, the bottom of the movable fork 12 is provided with two sets of guide grooves 13, and a support seat 9 is slidably disposed in the guide groove 13. One set of support seats 9 is rotatably connected to the threaded rod 8, and the other set of support seats 9 is fixedly connected to the guide rod 7. The support seats 9 can provide auxiliary support for the support seat 9 and the guide rod 7, preventing the threaded rod 8 from being damaged due to excessive force. The ends of the extension fork 22 and the transverse seat 4 are both provided with sliding grooves 26. The end of the extension fork 22 is provided with a slider 27, which is locked in the corresponding set of sliding grooves 26 to position and limit the lifting and lowering of multiple sets of extension forks 22, and to ensure that they have good load-bearing capacity after rising.

[0028] Please see Figure 4 , 5In this embodiment, the movable fork 12 is provided with a lifting mechanism connected to multiple sets of extension forks 22. The lifting mechanism converts the sliding of the movable fork 12 into driving the multiple sets of extension forks 22 to rise and fall sequentially to fill the gap between the transverse seat 4 and the movable fork 12. The lifting mechanism includes a vertical plate 23 provided at the bottom of the extension fork 22. Two sets of vertical plates 23 are arranged at intervals and are mounted on the first support rod 5. An inclined rail 24 is provided on one side of the vertical plate 23. Both ends of the inclined rail 24 are connected to a horizontal rail 25. One set of horizontal rail 25 passes through both ends of the vertical plate 23. A drive column 21 is provided on the drive seat 20. The drive column 21 can slide into the horizontal rail 25. A baffle 35 is provided at the bottom of the transverse seat 4. A spring (not shown) is provided between the baffle 35 and the extension fork 22.

[0029] In the initial state, when the extension fork 22 is not raised, it is located between the movable fork 12 and the second receiving rod 15. When the pusher 17 is moved laterally by rotating the threaded rod 8, the pusher 17 pushes the movable fork 12 to slide, and the drive column 21 slides in a set of flat rails 25 above until the movable fork 12 disengages from the surface of one set of extension forks 22. The extended forks 22 can then rise to a state flush with the movable fork 12 under the action of the spring. When the pusher 17 slides in the reverse direction, it first compresses the first elastic element 18. The drive column 21 slides into a set of flat rails 25 below and drives the extension fork 22 to descend and compress the spring through cooperation with the inclined rail 24. After the extension fork 22 has descended, it can control the sliding of the movable fork 12 under the action of the first elastic element 18, so that the extension fork 22 can fill the gap between the movable fork 12 and the transverse seat 4, thereby forming a complete supporting surface and preventing the bottom of the goods from entering the gap between the movable fork 12 and the transverse seat 4 and making unloading impossible.

[0030] Please see Figures 2 to 6 In this embodiment, the extension fork 22 is provided with a fixing mechanism connected to the movable fork 12. The fixing mechanism can selectively lock or unlock the position of the extension fork 22 after the extension fork 22 rises to be flush with the movable fork 12. The fixing mechanism includes a first wedge block 28 slidably disposed at the bottom of the extension fork 22. Both the extension fork 22 and the transverse seat 4 have fixing grooves 6 on one side. After the extension fork 22 rises, the end of the first wedge block 28 can be locked in the fixing groove 6. The first wedge block 28 has an inclined groove 29. The bottom of the extension fork 22 is slidably provided with a push block 30. The sliding direction of the push block 30 is perpendicular to the sliding direction of the first wedge block 28. The push block 30 is provided with a control post 31. The control post 31 is slidably locked in the inclined groove 29. The end of the push block 30 is provided with a second wedge block 32. The push frame 17 is provided with a push rod 14. The push rod 14 can abut against the inclined surface of the second wedge block 32. The bottom of the extension fork 22 is fixedly provided with a baffle 33. A second elastic member 34 is provided between the baffle 33 and the first wedge block 28.

[0031] When the extension fork 22 is in the retracted state, the first wedge block 28 is also in the retracted state, the second elastic element 34 is in the compressed state, and the push rod 14 abuts against the inclined surface of the second wedge block 32 to prevent the second wedge block 32 from sliding. When the movable fork 12 moves and causes the push rod 14 to disengage from the second wedge block 32, the second elastic element 34 controls the first wedge block 28 to extend. The first wedge block 28 controls the second wedge block 32 to slide through the cooperation of the inclined groove 29 and the control column 31. After the extension fork 22 rises, the first wedge block 28 can be inserted into the corresponding fixing groove 6 through the guidance of its end inclined surface to fix the position of the extension fork 22 and prevent the extension fork 22 from shifting after bearing the load. When the movable fork 12 is retracted, the push rod 14 pushes the inclined surface of the second wedge block 32 to make it slide, and the width of the second wedge block 32 is not less than the lifting distance of the extension fork 22, so as to ensure that the push rod 14 can always abut against the second wedge block 32. After the second wedge block 32 slides, the first wedge block 28 can be retracted and disengaged from the fixed groove 6 through the cooperation of the inclined groove 29 and the control column 31, and the extension fork 22 can then be lowered and retracted.

[0032] Specific usage and beneficial effects of the present invention: This device drives two sets of fork units to slide laterally through an adjustment component, adapting to the support requirements of goods of different widths and avoiding center of gravity shift caused by unilateral force. The sliding cooperation between the movable fork 12 and the transverse seat 4, combined with multiple sets of liftable extension forks 22, can flexibly expand the longitudinal support length, solving the problem of insufficient support for large-volume goods. It can also convert the sliding of the movable fork 12 into driving multiple sets of extension forks 22 to rise and fall sequentially through the lifting mechanism, automatically filling the gap between the movable fork 12 and the transverse seat 4, ensuring a continuous and flat support surface, and effectively dispersing the pressure of the goods. After the extension fork 22 rises to be flush with the movable fork 12, its position is locked by a fixing mechanism to ensure structural stability during the lifting process, effectively reducing the risk of tipping over due to center of gravity shift caused by insufficient support, while improving the safety of lifting operations and expanding the applicable scenarios of the forklift.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A fork structure for a forklift, characterized in that, The system includes a mounting base (1), on which two sets of fork units are slidably mounted via an adjustment assembly. Each fork unit includes: Transverse sliding seat (4); The movable fork (12) is slidably disposed at the end of the transverse seat (4), and the transverse seat (4) is provided with a drive mechanism for driving the movable fork (12) to slide. Multiple sets of extension forks (22) are provided and are arranged side by side in the transverse direction at the end of the transverse shift seat (4). The multiple sets of extension forks (22) and the transverse shift seat (4) are connected in a liftable manner. A lifting mechanism is provided on the movable fork (12) and connected to multiple sets of the extension forks (22) to convert the sliding of the movable fork (12) into driving multiple sets of the extension forks (22) to rise and fall sequentially to fill the gap between the transverse seat (4) and the movable fork (12). and A fixing mechanism is provided on the extension fork (22) and connected to the movable fork (12) so as to selectively lock or unlock the position of the extension fork (22) after the extension fork (22) rises to be flush with the movable fork (12).

2. The fork structure of a lifting forklift according to claim 1, characterized in that, The adjustment component includes: A positioning rod (2) is mounted on the mounting base (1), and both sets of transverse sliding seats (4) are slidably sleeved on the positioning rod (2); and A bidirectional lead screw (3) is rotatably mounted on the mounting base (1), and the threads at both ends of the screw are respectively screwed to the two sets of transverse sliding seats (4).

3. The fork structure of a lifting forklift according to claim 1, characterized in that: The bottom of the transverse seat (4) is provided with a first receiving rod (5), and the bottom of the movable fork (12) is provided with a second receiving rod (15). The second receiving rod (15) is slidably disposed on the first receiving rod (5). When the extension fork (22) is not raised, it is located between the movable fork (12) and the second receiving rod (15).

4. The fork structure of a lifting forklift according to claim 1, characterized in that: The extension fork (22) and the transverse seat (4) are both provided with a sliding groove (26) at their ends. The extension fork (22) is provided with a slider (27) at its end. The slider (27) is engaged in a corresponding set of the sliding grooves (26).

5. The fork structure of a forklift according to claim 3, characterized in that, The driving mechanism includes: The push frame (17) has a sliding frame (16) at the bottom of the movable fork (12), and the push frame (17) is slidably disposed in the sliding frame (16); The first elastic element (18) is disposed between the inner wall of the push frame (17) and the slide frame (16); The drive seat (20) is connected to the push frame (17) via a connecting frame (19); A threaded rod (8) is rotatably disposed at the bottom of the transverse seat (4) and screwed to the drive seat (20); and The guide rod (7) is fixedly installed at the bottom of the transverse seat (4) and is slidably connected to the drive seat (20).

6. The fork structure of a lifting forklift according to claim 5, characterized in that: The threaded rod (8) is provided with a first gear (10) at its end, and the movable fork (12) is rotatably provided with a second gear (11) at its bottom, the second gear (11) meshing with the first gear (10).

7. The fork structure of a lifting forklift according to claim 5, characterized in that: The movable fork (12) has two sets of guide grooves (13) at its bottom. A support seat (9) is slidably arranged in the guide groove (13). One set of the support seat (9) is rotatably connected to the threaded rod (8), and the other set of the support seat (9) is fixedly connected to the guide rod (7).

8. The fork structure of a forklift according to claim 5, characterized in that, The lifting mechanism includes: Upright plate (23) is set at the bottom of the extension fork (22) and two sets are arranged at intervals. The two sets of upright plates (23) are mounted on the first support rod (5). An inclined rail (24) is opened on one side of the upright plate (23). Both ends of the inclined rail (24) are connected to a flat rail (25). One set of the flat rail (25) passes through the upright plate (23). A drive column (21) is disposed on the drive seat (20) and can slide into the flat track (25); and A stop (35) is provided at the bottom of the transverse seat (4) and a spring is provided between it and the extension fork (22).

9. The fork structure of a forklift according to claim 8, characterized in that, The fixing mechanism includes: The first wedge block (28) is slidably disposed at the bottom of the extension fork (22). The extension fork (22) and the transverse seat (4) are provided with a fixing groove (6) on one side. After the extension fork (22) rises, the end of the first wedge block (28) can be locked in the fixing groove (6). The first wedge block (28) is provided with an inclined groove (29). The push block (30) is slidably disposed at the bottom of the extension fork (22), and its sliding direction is perpendicular to the sliding direction of the first wedge block (28). The push block (30) is provided with a control post (31), and the control post (31) is slidably engaged in the inclined groove (29). The second wedge block (32) is disposed at the end of the push block (30), and the push frame (17) is provided with a push rod (14), which can abut against the inclined surface of the second wedge block (32); and A baffle (33) is fixedly disposed at the bottom of the extension fork (22), and a second elastic element (34) is disposed between it and the first wedge block (28).

10. The fork structure of a lifting forklift according to claim 9, characterized in that: The width of the second wedge block (32) is not less than the lifting distance of the extension fork (22).

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