Unloading mechanism for forklift truck and working method thereof

Abstract

The application provides a forklift unloading mechanism and a working method thereof. By arranging a secondary sliding wheel and an elastic pressing assembly in the sliding assembly, when the two vertical side plates of the portal frame are deformed outward due to long-term lifting of heavy objects or influence of eccentric load, the secondary sliding wheel can always be in abutment with the opposite surface of the vertical side plate under the elastic force of the elastic pressing assembly, thereby automatically compensating the fitting gap caused by the deformation of the portal frame, and effectively avoiding the shaking of the lifting frame during the sliding process. At the same time, by eliminating the abnormal gap and shaking between the lifting frame and the portal frame, the impact and wear of each part in the sliding assembly are reduced, thereby prolonging the overall service life of the unloading mechanism and reducing the maintenance and replacement frequency.

Description

Technical Field

[0001] This invention belongs to the field of lifting equipment technology, specifically relating to the unloading mechanism of lifting equipment, and more particularly to an unloading mechanism for forklifts and its working method. Background Technology

[0002] Forklifts, as a type of crane, are widely used in container handling at ports. The unloading mechanism is a key component of the forklift for loading and unloading goods, and typically includes a mast, lifting frame, and forks. In existing technology, the lifting frame is mounted in the two vertical side plates of the mast via a sliding assembly and can slide up and down along the mast, while the forks are mounted on the horizontal rails of the lifting frame for carrying and moving goods.

[0003] In related technologies, due to the frequent lifting of heavy objects or the influence of eccentric loads by forklifts, the two vertical side plates of the mast are prone to outward bending or deformation. This deformation leads to an increase in the clearance between the lifting frame and the mast, which in turn causes the lifting frame to wobble during sliding. The wobble of the lifting frame not only affects the smoothness and positioning accuracy of the unloading operation, but may also accelerate the wear of the sliding components, reducing the service life and safety of the equipment.

[0004] Therefore, how to reduce the swaying of the lifting frame after the two vertical side plates deform is a technical problem that urgently needs to be solved.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0006] This disclosure provides at least one unloading mechanism for a forklift and its working method.

[0007] In a first aspect, embodiments of this disclosure provide a forklift unloading mechanism, comprising: The gantry has two vertical side panels; The lifting frame is embedded in the two vertical side plates of the gantry via a sliding component and is slidably connected to the gantry. Forks, which are slidably mounted on the horizontal rails of the lifting frame; The sliding component includes: A sliding frame is provided with sliding wheel sets on both sides, and the sliding wheel sets abut against the grooves of the vertical side plate; The pulley assembly includes: The main sliding wheel abuts against the two opposite sides of the groove in the vertical side plate; The auxiliary sliding wheel abuts against the opposing surfaces of the two vertical side plates via an elastic pressure assembly; When the two vertical side plates of the gantry deform outward, the auxiliary sliding wheel is held against the vertical side plates by the elastic pressure assembly to prevent the lifting frame from shaking.

[0008] In one optional embodiment, the sliding frame is H-shaped; The elastic pressurization component includes: The mounting block has a mounting groove in its middle for mounting the auxiliary sliding wheel; The auxiliary sliding wheel is rotatably connected to the mounting block via a rotating shaft; The telescopic frame has one end passing through the side plate of the sliding frame and being fixedly connected to the mounting block, while the other end of the telescopic frame is elastically connected to the side wall of the sliding frame via a return spring. In the initial state, the return spring is in a stretched state.

[0009] In one alternative embodiment, the other end of the telescopic frame extends outward to form a support plate; The return spring is sleeved on the insert rod of the telescopic frame, and one end of the return spring is fixedly connected to the abutment plate, while the other end is elastically connected to the side wall of the sliding frame.

[0010] In one optional embodiment, the sliding frame is further provided with an oil injection assembly; The injection port of the oil injection assembly is connected to the inner cavity of the rotating shaft; The inner cavity of the rotating shaft is provided with a through hole that communicates with the outer wall of the rotating shaft; When the auxiliary sliding wheel slides along the sliding frame, the lubrication component is triggered to lubricate the shaft and the auxiliary sliding wheel, thereby reducing the jamming of the auxiliary sliding wheel, reducing the wear of the auxiliary sliding wheel, and further preventing the lifting frame from shaking.

[0011] In one optional embodiment, the oil injection assembly includes: Compression tube; A receiving tube, which is embedded in the sliding frame; After the compression tube is inserted into the receiving tube, it is elastically connected to the receiving tube by a compression spring. An elastic trigger plug is provided at the end of the rotating shaft; The sliding frame has a guide notch on one of the two opposite sides of the groove, near the elastic trigger plug. One end of the compression tube is inserted into the inner cavity of the rotating shaft and abuts against the side wall of the elastic trigger plug; When the elastic trigger plug near the guide notch slides past the guide notch, the elastic trigger plug first penetrates into the guide notch under the action of the compression spring, and then is guided by the guide notch to squeeze the elastic trigger plug, so that the side wall of the elastic trigger plug abuts against the compression tube again, and squeezes the compression tube to squeeze the receiving tube inward.

[0012] In one optional embodiment, the contact surface between the elastic trigger plug and the compression tube is a tapered surface; When the side wall of the elastic trigger plug squeezes the compression tube, it drives the compression tube to squeeze the receiving tube inward, so as to force the lubricating oil in the receiving tube into the inner cavity of the rotating shaft, so that the lubricating oil can flow from the through hole into the space between the rotating shaft and the auxiliary sliding wheel.

[0013] In one optional embodiment, a sealing ring is provided on the abutting surface between the elastic trigger plug and the inner cavity of the rotating shaft.

[0014] In one optional embodiment, the number of the oil injection components is two; The two oil injection components are respectively disposed on both sides of the mounting block; The number of the elastic trigger plugs is also two; The two elastic trigger plugs are respectively disposed at both ends of the inner cavity of the rotating shaft.

[0015] In one optional embodiment, the groove is a square groove; The rotation axes of the main sliding wheel and the auxiliary sliding wheel are perpendicular to the two adjacent sides of the groove, respectively.

[0016] Secondly, this disclosure also provides a working method for using the forklift unloading mechanism as described above, wherein when the two vertical side plates of the mast deform outward, the working method includes: The lifting frame slides on the two vertical side plates of the gantry; The auxiliary pulley moves outward under the action of the elastic pressure component; Maintain the contact between the auxiliary sliding wheel and the groove of the vertical side plate to prevent the lifting frame from shaking.

[0017] The beneficial effects of this invention are that, by incorporating a secondary sliding wheel and an elastic pressure assembly into the sliding component, when the two vertical side plates of the mast deform due to long-term lifting of heavy objects or eccentric loading, the secondary sliding wheel can maintain contact with the opposite surfaces of the vertical side plates under the elastic force of the elastic pressure assembly. This automatically compensates for the clearance caused by mast deformation, effectively preventing the lifting frame from wobbling during sliding. Simultaneously, by eliminating abnormal clearances and wobbling between the lifting frame and the mast, the impact and wear of components in the sliding component are reduced, thereby extending the overall service life of the unloading mechanism and reducing the frequency of maintenance and replacement.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the unloading mechanism for a forklift provided in an embodiment of this disclosure; Figure 2 A cross-sectional view of a forklift unloading mechanism provided in an embodiment of this disclosure; Figure 3 A cross-sectional view from another perspective of the forklift unloading mechanism provided in an embodiment of this disclosure; Figure 4 A flowchart illustrating the working method of the forklift unloading mechanism provided in this embodiment of the disclosure.

[0022] In the diagram: 100, mast; 110, vertical side plate; 111, guide notch; 200, lifting frame; 300, forks; 400, sliding assembly; 410, sliding frame; 420, main sliding wheel; 430, auxiliary sliding wheel; 440, elastic pressure assembly; 441, mounting block; 442, telescopic frame; 443, pivot; 4431, inner cavity; 4432, through hole; 444, return spring; 445, support plate; 446, elastic trigger plug; 447, sealing ring; 450, oil injection assembly; 451, receiving tube; 452, compression tube. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0025] Research has revealed that due to frequent lifting of heavy objects or the influence of eccentric loads, the two vertical side plates of the mast are prone to outward bending or deformation. This deformation increases the clearance between the lifting frame and the mast, leading to wobbling of the lifting frame during sliding. This wobbling not only affects the smoothness and positioning accuracy of unloading operations but may also accelerate the wear of sliding components, reducing the equipment's lifespan and safety.

[0026] Based on the above research, this disclosure provides a forklift unloading mechanism and its working method. By setting an auxiliary sliding wheel 430 and an elastic pressure component 440 in the sliding assembly 400, when the two vertical side plates 110 of the mast 100 deform due to long-term lifting of heavy objects or being affected by eccentric loading, the auxiliary sliding wheel 430 can always maintain abutment against the opposite surface of the vertical side plate 110 under the elastic force of the elastic pressure component 440, thereby automatically compensating for the fitting clearance caused by the deformation of the mast 100 and effectively preventing the lifting frame 200 from shaking during sliding. At the same time, by eliminating the abnormal gap and shaking between the lifting frame 200 and the mast 100, the impact and wear of the components of the sliding assembly 400 are reduced, thereby extending the overall service life of the unloading mechanism and reducing the frequency of maintenance and replacement.

[0027] The shortcomings of the above solutions are the result of the inventors' practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure embodiments in this article should be considered as contributions made by the inventors during the development of the present disclosure embodiments.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] Please see Figure 1 and Figure 2 At least one embodiment provides a forklift unloading mechanism, comprising: a mast 100 having two vertical side plates 110; a lifting frame 200 embedded in the two vertical side plates 110 of the mast 100 via a sliding assembly 400 and slidably connected to the mast 100; and forks 300 slidably mounted on the horizontal rails of the lifting frame 200; wherein the sliding assembly 400 includes: a sliding frame 410 having sliding wheel sets on both sides, the sliding wheel sets being connected to the vertical side plates 110 of the mast 100. The groove of the vertical side plate 110 abuts against it; the sliding wheel assembly includes: a main sliding wheel 420, which abuts against the two opposite sides of the groove of the vertical side plate 110; and a secondary sliding wheel 430, which abuts against the opposite surfaces of the two vertical side plates 110 through an elastic pressure assembly 440; when the two vertical side plates 110 of the gantry 100 deform outward, the secondary sliding wheel 430 remains abutting against the vertical side plate 110 through the elastic pressure assembly 440 to prevent the lifting frame 200 from shaking.

[0031] By incorporating a secondary sliding wheel 430 and an elastic pressure assembly 440 into the sliding assembly 400, when the two vertical side plates 110 of the gantry 100 deform due to long-term lifting of heavy objects or eccentric loading, the secondary sliding wheel 430 can maintain contact with the opposite surfaces of the vertical side plates 110 under the elastic force of the elastic pressure assembly 440. This automatically compensates for the clearance caused by the deformation of the gantry 100, effectively preventing the lifting frame 200 from wobbling during sliding. Simultaneously, by eliminating abnormal clearances and wobbling between the lifting frame 200 and the gantry 100, the impact and wear of the components of the sliding assembly 400 are reduced, thereby extending the overall service life of the unloading mechanism and reducing the frequency of maintenance and replacement.

[0032] Please see Figure 2 and Figure 3The sliding frame 410 is H-shaped; the elastic pressure assembly 440 includes: a mounting block 441, the middle of which has a mounting groove for mounting the auxiliary sliding wheel 430; the auxiliary sliding wheel 430 is rotatably connected to the mounting block 441 via a rotating shaft 443; a telescopic frame 442, one end of which passes through the side plate of the sliding frame 410 and is fixedly connected to the mounting block 441, and the other end of the telescopic frame 442 is elastically connected to the side wall of the sliding frame 410 via a return spring 444; in the initial state, the return spring 444 is in a stretched state.

[0033] When the vertical side plate 110 of the gantry 100 deforms outward, the auxiliary sliding wheel 430 automatically moves outward under the tension of the return spring 444, continuously supporting the side plate, thereby effectively compensating for the fit clearance and preventing the lifting frame 200 from shaking.

[0034] It should be noted that, in order to ensure the tensile force of the return spring 444, the other end of the telescopic frame 442 extends outward to form a support plate 445; the return spring 444 is sleeved on the insert rod of the telescopic frame 442, and one end of the return spring 444 is fixedly connected to the support plate 445, and the other end is elastically connected to the side wall of the sliding frame 410.

[0035] By setting a support plate 445 at the other end of the telescopic frame 442, and sleeve the return spring 444 on the insert rod with both ends fixedly connected to the support plate 445 and the side wall of the sliding frame 410 respectively, the installation stability of the return spring 444 and the consistency of the force transmission direction are ensured, and the spring is prevented from shifting or falling off.

[0036] Please continue reading. Figure 2 and Figure 3 The sliding frame 410 is also provided with an oil injection component 450; the injection port of the oil injection component 450 is connected to the inner cavity 4431 of the rotating shaft 443; the inner cavity 4431 of the rotating shaft 443 is provided with a through hole 4432 that is connected to the outer wall of the rotating shaft 443; when the auxiliary sliding wheel 430 slides along the sliding frame 410, the oil injection component 450 is triggered to lubricate the rotating shaft 443 and the auxiliary sliding wheel 430, so as to reduce the jamming of the auxiliary sliding wheel 430, thereby reducing the wear of the auxiliary sliding wheel 430 and further preventing the lifting frame 200 from shaking.

[0037] By adding an oil injection component 450 to the sliding frame 410 and connecting the injection port to the inner cavity 4431 and through hole 4432 of the rotating shaft 443, automatic lubrication between the rotating shaft 443 and the auxiliary sliding wheel 430 is achieved during the sliding process of the auxiliary sliding wheel 430. This reduces the jamming and wear of the auxiliary sliding wheel 430 and avoids the shaking of the lifting frame 200 during lifting due to increased frictional resistance.

[0038] The oil injection assembly 450 includes: a compression tube 452; a receiving tube 451, which is embedded in the sliding frame 410; the compression tube 452 is inserted into the receiving tube 451 and elastically connected to the receiving tube 451 by a compression spring; an elastic trigger plug 446 is provided at the end of the rotating shaft 443; a guide notch 111 is provided on one of the two opposite sides of the groove of the sliding frame 410 near the elastic trigger plug 446; one end of the compression tube 452 is inserted into the rotating shaft 410. In the inner cavity 4431 of 43, and abutting against the side wall of the elastic trigger plug 446; when the elastic trigger plug 446 near the guide notch 111 slides past the guide notch 111, the elastic trigger plug 446 first penetrates into the guide notch 111 under the action of the compression spring, and then is guided by the guide notch 111 to squeeze the elastic trigger plug 446, so that the side wall of the elastic trigger plug 446 abuts against the compression tube 452 again, and squeezes the compression tube 452 to squeeze the receiving tube 451 inward.

[0039] Each time the auxiliary sliding wheel 430 passes a specific position, the elastic trigger plug 446 first penetrates the guide notch 111 and is then squeezed back into place, thereby triggering the compression tube 452 to squeeze the receiving tube 451 to inject oil. This structure achieves mechanical automatic oil injection without the need for an additional power source.

[0040] Please continue reading. Figure 2 and Figure 3 The contact surface between the elastic trigger plug 446 and the compression tube 452 is a tapered surface; when the side wall of the elastic trigger plug 446 presses the compression tube 452, it drives the compression tube 452 to press the receiving tube 451 inward, so as to force the lubricating oil in the receiving tube 451 into the inner cavity 4431 of the rotating shaft 443, so that the lubricating oil can flow from the through hole 4432 between the rotating shaft 443 and the auxiliary sliding wheel 430.

[0041] By setting the contact surface between the elastic trigger plug 446 and the compression tube 452 to a tapered surface, a larger axial force can be generated when the two come into contact, which pushes the compression tube 452 to squeeze the receiving tube 451 more effectively.

[0042] The elastic trigger plug 446 and the inner cavity 4431 of the rotating shaft 443 are provided with a sealing ring 447.

[0043] In a preferred embodiment, there are two oil injection components 450; the two oil injection components 450 are respectively disposed on both sides of the mounting block 441; there are also two elastic trigger plugs 446; the two elastic trigger plugs 446 are respectively disposed at both ends of the inner cavity 4431 of the rotating shaft 443.

[0044] It should be noted that the groove is a square groove; the rotation axes of the main sliding wheel 420 and the auxiliary sliding wheel 430 are perpendicular to the two adjacent sides of the groove, respectively.

[0045] By setting the groove as a square groove and making the rotation axes of the main sliding wheel 420 and the auxiliary sliding wheel 430 perpendicular to the two adjacent sides of the groove, the main sliding wheel 420 undertakes the main guidance, and the auxiliary sliding wheel 430 is specifically responsible for lateral compensation, which reduces mutual interference and improves the overall running stability of the sliding wheel group.

[0046] Please see Figure 4 This disclosure also provides a working method for the forklift unloading mechanism described above. By providing a secondary sliding wheel 430 and an elastic pressure component 440 in the sliding assembly 400, when the two vertical side plates 110 of the mast 100 deform due to long-term lifting of heavy objects or eccentric loading, the secondary sliding wheel 430 can always maintain contact with the opposite surface of the vertical side plate 110 under the elastic force of the elastic pressure component 440. This automatically compensates for the fitting gap caused by the deformation of the mast 100, effectively preventing the lifting frame 200 from shaking during sliding. At the same time, by eliminating abnormal gaps and shaking between the lifting frame 200 and the mast 100, the impact and wear of the components of the sliding assembly 400 are reduced, thereby extending the overall service life of the unloading mechanism and reducing the frequency of maintenance and replacement.

[0047] When the two vertical side plates 110 of the gantry 100 deform outward, the working method includes: S110: The lifting frame 200 slides on the two vertical side plates 110 of the gantry 100; S120: The auxiliary sliding wheel 430 moves outward under the action of the elastic pressure component 440; S130: Maintain the abutment between the auxiliary sliding wheel 430 and the groove of the vertical side plate 110 to prevent the lifting frame 200 from shaking.

[0048] In summary, this invention provides a forklift unloading mechanism and its working method. By setting an auxiliary sliding wheel 430 and an elastic pressure component 440 in the sliding assembly 400, when the two vertical side plates 110 of the mast 100 deform due to long-term lifting of heavy objects or eccentric loading, the auxiliary sliding wheel 430 can always maintain contact with the opposite surface of the vertical side plate 110 under the elastic force of the elastic pressure component 440, thereby automatically compensating for the fitting clearance caused by the deformation of the mast 100 and effectively preventing the lifting frame 200 from shaking during sliding. At the same time, by eliminating abnormal gaps and shaking between the lifting frame 200 and the mast 100, the impact and wear of the components of the sliding assembly 400 are reduced, thereby extending the overall service life of the unloading mechanism and reducing the frequency of maintenance and replacement.

[0049] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0050] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0051] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

Claims

1. A forklift unloading mechanism, characterized in that, include: The gantry (100) has two vertical side plates (110). The lifting frame (200) is embedded in the two vertical side plates (110) of the gantry (100) via a sliding component (400) and is slidably connected to the gantry (100); Forks (300) are slidably mounted on the cross rails of the lifting frame (200); The sliding component (400) includes: The sliding frame (410) has sliding wheel sets on both sides, and the sliding wheel sets abut against the groove of the vertical side plate (110); The pulley assembly includes: The main sliding wheel (420) abuts against the two opposite sides of the groove of the vertical side plate (110); The auxiliary sliding wheel (430) abuts against the opposing surfaces of the two vertical side plates (110) via an elastic pressure assembly (440); When the two vertical side plates (110) of the gantry (100) deform outward, the auxiliary sliding wheel (430) is held against the vertical side plate (110) by the elastic pressure assembly (440) to prevent the lifting frame (200) from shaking.

2. The forklift unloading mechanism as described in claim 1, characterized in that, The sliding frame (410) is H-shaped; The elastic pressure assembly (440) includes: The mounting block (441) has a mounting groove in its middle for mounting the auxiliary sliding wheel (430); The auxiliary sliding wheel (430) is rotatably connected to the mounting block (441) via a rotating shaft (443); The telescopic frame (442) has one end passing through the side plate of the sliding frame (410) and then fixedly connected to the mounting block (441). The other end of the telescopic frame (442) is elastically connected to the side wall of the sliding frame (410) through a return spring (444). In the initial state, the return spring (444) is in a stretched state.

3. The forklift unloading mechanism as described in claim 2, characterized in that, The other end of the telescopic frame (442) extends outward to form a support plate (445). The reset spring (444) is sleeved on the insert rod of the telescopic frame (442), and one end of the reset spring (444) is fixedly connected to the abutment plate (445), and the other end is elastically connected to the side wall of the sliding frame (410).

4. The forklift unloading mechanism as described in claim 2, characterized in that, The sliding frame (410) is also provided with an oil injection assembly (450). The injection port of the oil injection assembly (450) is connected to the inner cavity (4431) of the rotating shaft (443); The inner cavity (4431) of the rotating shaft (443) is provided with a through hole (4432) that communicates with the outer wall of the rotating shaft (443). When the auxiliary sliding wheel (430) slides along the sliding frame (410), the oil injection component (450) is triggered to lubricate the shaft (443) and the auxiliary sliding wheel (430) to reduce the jamming of the auxiliary sliding wheel (430), thereby reducing the wear of the auxiliary sliding wheel (430) and further preventing the lifting frame (200) from shaking.

5. The forklift unloading mechanism as described in claim 4, characterized in that, The oil injection assembly (450) includes: Compression tube (452); A receiving tube (451) is embedded in the sliding frame (410); After the compression tube (452) is inserted into the receiving tube (451), it is elastically connected to the receiving tube (451) by a compression spring; The end of the rotating shaft (443) is provided with an elastic trigger plug (446). The sliding frame (410) has a guide notch (111) on one of the two opposite sides of the groove, near the elastic trigger plug (446). One end of the compression tube (452) is inserted into the inner cavity (4431) of the rotating shaft (443) and abuts against the side wall of the elastic trigger plug (446); When the elastic trigger plug (446) near the guide notch (111) slides past the guide notch (111), the elastic trigger plug (446) first penetrates into the guide notch (111) under the action of the compression spring, and then is guided by the guide notch (111) to squeeze the elastic trigger plug (446), so that the side wall of the elastic trigger plug (446) and the compression tube (452) are back against each other, and the compression tube (452) is squeezed to squeeze the receiving tube (451) inward.

6. The forklift unloading mechanism as described in claim 5, characterized in that, The contact surface between the elastic trigger plug (446) and the compression tube (452) is a conical surface; When the side wall of the elastic trigger plug (446) squeezes the compression tube (452), it drives the compression tube (452) to squeeze the receiving tube (451) inward, so as to force the lubricating oil in the receiving tube (451) into the inner cavity (4431) of the rotating shaft (443), so that the lubricating oil flows from the through hole (4432) between the rotating shaft (443) and the auxiliary sliding wheel (430).

7. The forklift unloading mechanism as described in claim 5, characterized in that, A sealing ring (447) is provided on the abutting surface between the elastic trigger plug (446) and the inner cavity (4431) of the rotating shaft (443).

8. The forklift unloading mechanism as described in claim 5, characterized in that, The number of the oil injection components (450) is two; The two oil injection assemblies (450) are respectively disposed on both sides of the mounting block (441); The number of the elastic trigger plugs (446) is also two; The two elastic trigger plugs (446) are respectively disposed at both ends of the inner cavity (4431) of the rotating shaft (443).

9. The forklift unloading mechanism as described in claim 1, characterized in that, The groove is a square groove; The rotation axes of the main sliding wheel (420) and the auxiliary sliding wheel (430) are perpendicular to the two adjacent sides of the groove, respectively.

10. A method for operating a forklift unloading mechanism as described in claim 1, characterized in that, When the two vertical side plates (110) of the gantry (100) deform outward, the working method includes: The lifting frame (200) slides on the two vertical side plates (110) of the gantry (100); The auxiliary sliding wheel (430) moves outward under the action of the elastic pressure assembly (440); Maintain the abutment between the auxiliary sliding wheel (430) and the groove of the vertical side plate (110) to prevent the lifting frame (200) from shaking.

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