Forklift assembling and jacking device

Abstract

The invention provides a forklift assembling and jacking device, and relates to the technical field of jacking devices. The forklift assembling and jacking device comprises a hydraulic jacking mechanism, a covering plate and an internal telescopic protection assembly. The hydraulic cylinder supports the top supporting plate for lifting adjustment, and the locking assembly, the bottom plate and the cross frame are installed in a matched mode. The multiple layers of middle-section barrel shells are sequentially and movably sleeved with the base barrel shell in a sealed mode, the top barrel shell is movably sleeved with the innermost portions of the middle-section barrel shells, the diameters of the base barrel shell, the middle-section barrel shells and the top barrel shell are reduced layer by layer inwards, and the base barrel shell is communicated and matched with a hydraulic system. An internal telescopic protection assembly located on the inner side of the cross frame and composed of the base barrel shell, the middle section barrel shell and the top barrel shell can be matched with the jacking height of the jacking plate to conduct adaptive adjustment for anti-falling protection, the internal telescopic protection assembly is located on the inner side of the cross frame during overall telescopic operation, the structure occupied area does not need to be additionally increased, and the structure is convenient to use. And the horizontal descending placement of the hydraulic jacking mechanism is not delayed.

Description

Technical Field

[0001] The present application relates to the technical field of jacking devices, and in particular to a forklift assembly jacking device. Background Art

[0002] The assembly of a forklift jacking device is a critical step in the forklift manufacturing process. It primarily consists of a hydraulic system, a lifting mechanism, and a control device. To reduce installation space, some jacking devices can be installed directly on the ground or in a shallow pit. After lifting, these jacking devices rely primarily on a single mechanical locking mechanism for fall protection. These jacking devices offer a relatively simple fall protection mechanism. Improving the diversity of fall protection offered by these jacking devices would significantly enhance the safety of forklift assembly jacking devices. Summary of the Invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a forklift assembly lifting device, which currently has a relatively simple anti-fall protection method for ground-mounted lifting devices.

[0004] According to an embodiment of the present application, a forklift assembly jacking device includes: a hydraulic jacking mechanism, a covering plate and an internal telescopic protection component.

[0005] The hydraulic jacking mechanism includes a base plate, a top support plate, a hydraulic cylinder, a cross frame and a locking assembly. The cross frame is arranged between the top support plate and the base plate, and the top support plate is supported by the hydraulic cylinder for lifting and lowering adjustment. The locking assembly is installed in conjunction with the base plate and the cross frame. The covering plate is installed at the end of the hydraulic jacking mechanism; The internal telescopic protection component is located on the inner side of the cross frame. The internal telescopic protection component includes a base cylinder shell with openings at both ends, a middle cylinder shell with openings at both ends, and a top cylinder shell with openings at the bottom. The base cylinder shell is set on the bottom plate. The multiple layers of the middle cylinder shell are movably sealed and sleeved in the base cylinder shell in sequence. The top cylinder shell is movably sleeved and set in the innermost part of the middle cylinder shell. The base cylinder shell, middle cylinder shell, and top cylinder shell are arranged with decreasing diameters layer by layer inwardly. The base cylinder shell is connected and coordinated with the hydraulic system.

[0006] Preferably, the hydraulic jacking mechanism also includes an articulated seat I and an articulated seat II, the articulated seat I is fixed inside the hydraulic jacking mechanism, the articulated seat II is slidably arranged inside the hydraulic jacking mechanism, one end of the bottom of the cross frame is hinged to the articulated seat I, and the other end of the bottom of the cross frame is hinged to the articulated seat II.

[0007] Preferably, the hydraulic jacking mechanism further comprises a slider, which is arranged at the end of the articulated seat II, and a guide rail groove matching the bottom plate is provided on the inner side of the bottom plate.

[0008] Preferably, one end of the top of the cross frame is hinged to the top support plate, and the other end of the top of the cross frame is slidably arranged with the top support plate.

[0009] Preferably, the covering panels include two groups, and the two groups of covering panels are respectively installed at both ends of the base plate.

[0010] Preferably, the covering plate comprises a side cover plate and a wedge-shaped end plate, the wedge-shaped end plate is fixedly arranged at the end of the bottom plate, and the side cover plate is located outside the cross frame.

[0011] Preferably, the covering plate further comprises a fixing plate, the fixing plate is located inside the opening close to one end of the side cover plate, and the fixing plate is fixedly connected to the bottom plate.

[0012] Preferably, one end of the side cover plate is connected to a mounting plate via a hinge, and the mounting plate and the fixing plate are detachably mounted.

[0013] Preferably, a slot is provided on the top of the mounting plate, and a positioning block that is engaged with the slot is provided on the side of the fixing plate close to the side cover plate.

[0014] Preferably, the internal telescopic protection assembly further includes a barrel belt, which is arranged between adjacent middle barrel shells, between the base barrel shell and the middle barrel shell, and between the middle barrel shell and the top barrel shell.

[0015] The forklift assembly lifting device also includes a base oil storage mechanism, which includes a base shell, a reinforcement plate and a connecting shell with an elongated structure. The base shell is fixed to the bottom of the base plate, and multiple reinforcement plates are arranged inside the base shell. The two reinforcement plates located below the internal telescopic protection component form an oil storage cavity with the base shell. The bottom of the base plate is provided with a mounting port, and the bottom of the base cylinder shell is installed inside the mounting port. The connecting shell is located inside the oil storage cavity and is fixed to the base shell, and the top of the connecting shell is connected to the bottom of the base cylinder shell. The outer edge of the bottom of the connecting shell is provided with a connecting groove. An oil-linked pressurizing mechanism includes a piston, a guide frame and an arm. The guide frame is fixedly arranged inside the base shell, and the guide frame is provided with a guide groove. The piston is movably arranged inside the oil storage cavity. The top of the base shell and the top of the bottom plate are both provided with guide grooves. One end of the arm passes through the guide groove, the side wall of the oil storage cavity is connected to the piston, the arm slides through the guide groove, and the top of the arm is connected to the slider.

[0016] Preferably, the piston member includes an intermediate block, an end block and an elastic layer. The two end blocks are integrally formed and arranged at both ends of the intermediate block. The end block is an arc-shaped structure close to the connecting shell. The intermediate block and the end block are provided with inner cavity grooves. The front side of the end block end wall is set as an arc surface. The end block is provided with multiple groups of vertical grooves on one side of the intermediate block. The elastic layer is wrapped around the outside of the intermediate block and the end block.

[0017] The beneficial effects of the present application are as follows: the present application obtains a forklift assembly jacking device through the above-mentioned design. In the process of the hydraulic cylinder cooperating with the cross frame to jack up the top support plate, the hydraulic system simultaneously injects oil into the base cylinder shell inside the internal telescopic protection component. The oil pressure inside the base cylinder shell, the middle cylinder shell and the top cylinder shell gradually increases, and the top wall of the top cylinder shell will always be jacked up under the top support plate to provide secondary protection for the top support plate from falling. The internal telescopic protection component composed of the base cylinder shell, the middle cylinder shell and the top cylinder shell, which is located on the inner side of the cross frame, can not only be adaptively adjusted to match the height of the top support plate jacking for fall protection, but also the internal telescopic protection component is located on the inner side of the cross frame during telescopic operation. There is no need to increase the structural area occupied by the hydraulic jacking mechanism, and it does not delay the horizontal landing and placement of the hydraulic jacking mechanism.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of a double-group structure of a forklift assembly jacking device according to an embodiment of the present application; Figure 2 This is a schematic diagram of a single-group structure of a forklift assembly jacking device according to an embodiment of the present application; Figure 3 is a schematic structural diagram of a hydraulic jacking mechanism and a wedge-shaped end plate according to an embodiment of the present application; Figure 4 is a schematic diagram of the structure of the covering plate according to an embodiment of the present application; Figure 5 is a schematic diagram of a partial structure of a hydraulic jacking mechanism according to an embodiment of the present application; Figure 6This is a schematic structural diagram of the internal telescopic protection assembly, the base oil storage mechanism, and the oil linkage pressurizing mechanism according to an embodiment of the present application; Figure 7 is a schematic structural diagram of an internal telescopic protection assembly according to an embodiment of the present application; Figure 8 This is a schematic diagram of the cross-sectional structure of the connection between adjacent middle-section shells according to an embodiment of the present application; Figure 9 This is a schematic structural diagram of an internal telescopic protection assembly, an internal cross-section of a base oil storage mechanism, and an oil linkage pressurizing mechanism according to an embodiment of the present application; Figure 10 is a schematic diagram of a connected shell structure according to an embodiment of the present application; Figure 11 Schematic diagram of the structure of the oil-liquid linkage pressurizing mechanism according to an embodiment of the present application; Figure 12 It is a schematic diagram of the cross-sectional structure of a piston component according to an embodiment of the present application.

[0021] Reference numerals: 1. Hydraulic jacking mechanism; 11. Bottom plate; 111. Mounting port; 12. Top support plate; 13. Hydraulic cylinder; 14. Cross frame; 15. Locking assembly; 16. Articulated seat I; 17. Articulated seat II; 18. Slider; 19. Guide rail groove; 2. Covering plate; 21. Side cover; 22. Wedge-shaped end plate; 23. Mounting plate; 24. Hinge; 25. Slot; 26. Positioning block; 27. Fixing plate; 3. Internal telescopic protection assembly; 31. Base shell; 32 , middle cylinder shell; 33, top cylinder shell; 34, cylinder belt; 4, base oil storage mechanism; 41, base shell; 42, reinforcement plate; 43, oil storage chamber; 44, connecting shell; 45, connecting groove; 46, guide strip groove; 5, oil linkage pressurizing mechanism; 51, piston member; 511, intermediate block; 512, end block; 513, vertical groove; 514, inner cavity groove; 515, arc surface; 516, elastic layer; 52, guide frame; 53, guide groove; 54, arm bracket. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0023] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] A forklift assembly lifting device according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0026] Example 1 See also Figure 1-Figure 7 According to an embodiment of the present application, a forklift assembly jacking device includes: a hydraulic jacking mechanism 1, a covering plate 2 and an internal telescopic protection component 3.

[0027] The hydraulic jacking mechanism 1 is used to lift the forklift for the forklift team leader. The cover panel 2, in conjunction with the hydraulic jacking mechanism 1, protects the hydraulic jacking mechanism 1 when it is flat. The internal telescopic protection assembly 3, in addition to the conventional mechanical locking mechanism, is installed within the hydraulic jacking mechanism 1 to synchronously raise and lower the hydraulic jacking mechanism 1 to protect the forklift assembled on the jacking device.

[0028] The hydraulic jacking mechanism 1 comprises a base plate 11, a support plate 12, a hydraulic cylinder 13, a cross frame 14, and a locking assembly 15. The cross frame 14 is positioned between the support plate 12 and the base plate 11 and supports the support plate 12 for elevation adjustment via the hydraulic cylinder 13. The locking assembly 15 is mounted in conjunction with the base plate 11 and cross frame 14. A cover plate 2 is mounted at the end of the hydraulic jacking mechanism 1. An internal telescopic protection assembly 3 is located inside the cross frame 14 and comprises a base cylindrical shell 31 with openings at both ends, a middle cylindrical shell 32 with openings at both ends, and a top cylindrical shell 33 with openings at the bottom. The base cylindrical shell 31 is mounted on the base plate 11. Multiple layers of middle cylindrical shells 32 are sequentially and flexibly and sealingly mounted within the base cylindrical shell 31. The top cylindrical shell 33 is flexibly mounted within the innermost portion of the middle cylindrical shell 32. The diameters of the base cylindrical shell 31, middle cylindrical shell 32, and top cylindrical shell 33 decrease inwardly. The base cylindrical shell 31 is connected to the hydraulic system.

[0029] The forklift assembly jacking device can be installed on the ground for jacking use. The device is divided into two identical parts, which can perform jacking operations simultaneously, and the overall installation of the jacking device is relatively convenient. The hydraulic cylinder 13 in the jacking device can be telescopically coordinated with the cross frame 14 to lift the top support plate 12 to support the forklift, which is convenient for the assembly and production of the forklift. The specific working principle is that the hydraulic jacking mechanism 1 is pre-flattened, and the forklift as a whole travels to the top support plate 12 in a horizontal position. The hydraulic cylinder 13 cooperates with the cross frame 14 to lift the top support plate 12, that is, to lift the forklift above the top support plate 12. During the lifting process of the top support plate 12, the locking assembly 15 cooperates with the deformation of the cross frame 14 and moves to complete the mechanical locking to prevent the top support plate 12 from falling suddenly. The locking assembly 15 can adopt the commonly used wedge block and rack coordination method. The specific structure is a technical solution that can be known to those skilled in the art and will not be described in detail here.

[0030] During the process of the hydraulic cylinder 13 cooperating with the cross frame 14 to lift the top support plate 12, the hydraulic system simultaneously injects oil into the base cylinder shell 31 inside the internal telescopic protection assembly 3. The oil pressure inside the base cylinder shell 31, the middle cylinder shell 32, and the top cylinder shell 33 gradually increases, and the top wall of the top cylinder shell 33 will always be lifted below the top support plate 12, which is used for secondary protection of the top support plate 12 from falling. The internal telescopic protection assembly 3 composed of the base cylinder shell 31, the middle cylinder shell 32, and the top cylinder shell 33, which is located on the inner side of the cross frame 14, can not only be adaptively adjusted to cooperate with the lifting height of the top support plate 12 for anti-fall protection, but also the internal telescopic protection assembly 3 is located on the inner side of the cross frame 14 during the overall telescopic operation, without the need to increase the structural area occupied by the hydraulic jacking mechanism 1, and will not delay the horizontal landing and placement of the hydraulic jacking mechanism 1.

[0031] For details, please refer to Figure 3 The hydraulic jacking mechanism 1 also includes an articulated seat I 16 and an articulated seat II 17. Articulated seat I 16 is fixed inside the hydraulic jacking mechanism 1, and articulated seat II 17 is slidably arranged inside the hydraulic jacking mechanism 1. One end of the bottom of the cross frame 14 is hinged to the articulated seat I 16, and the other end of the bottom of the cross frame 14 is hinged to the articulated seat II 17. The hydraulic jacking mechanism 1 also includes a slider 18, which is arranged at the end of the articulated seat II 17. A guide groove 19 that cooperates with the bottom plate 11 is provided on the inner side of the bottom plate 11. The provision of the guide groove 19 and the slider 18 is to enhance the stability of the articulated seat II 17 when it slides inside the bottom plate 11.

[0032] Further, one end of the top of the cross frame 14 is hinged to the top support plate 12, and the other end of the top of the cross frame 14 is slidably arranged with the top support plate 12. This cooperation realizes that the cross frame 14 can better lift and support the top support plate 12 above.

[0033] In the above specific implementation, please refer to Figure 2 and Figure 4 The covering plate 2 includes two groups, and the two groups of covering plate 2 are respectively installed at both ends of the base plate 11. The covering plate 2 includes a side cover plate 21 and a wedge-shaped end plate 22. The wedge-shaped end plate 22 is fixedly arranged at the end of the base plate 11, and the side cover plate 21 is located on the outside of the cross frame 14. The covering plate 2 also includes a fixed plate 27. The fixed plate 27 is located inside the base plate 11 near one end of the side cover plate 21, and the fixed plate 27 is fixedly connected to the base plate 11. One end of the side cover plate 21 is connected to the mounting plate 23 by a hinge 24, and the mounting plate 23 and the fixing plate 27 are detachable. When the hydraulic jacking mechanism 1 is in a horizontal position, the side cover plate 21 and the wedge-shaped end plate 22 cover the upper part of the base plate 11 near the outer part. The wedge-shaped structure design of the wedge-shaped end plate 22 makes it easier for the forklift to travel to the top of the support plate 12. A slot 25 is provided on the top of the mounting plate 23, and a positioning block 26 that engages with the slot 25 is provided on the side of the fixing plate 27 close to the side cover plate 21. The positioning block 26 cooperates with the slot 25 to facilitate the disassembly and assembly of the side cover plate 21 , and the fixing plate 27 is used to improve the supporting performance of the wedge-shaped end plate 22 .

[0034] For details, please refer to Figure 8 The internal telescopic protection assembly 3 further includes a barrel band 34, which is arranged between adjacent middle barrel shells 32, between the base barrel shell 31 and the middle barrel shell 32, and between the middle barrel shell 32 and the top barrel shell 33. The barrel band 34 can be made of a non-metallic polymer composite material.

[0035] Example 2 The above-mentioned forklift assembly lifting device requires a hydraulic system to cooperate with the internal telescopic protection component 3 for lifting, and the oil inlet and outlet of the hydraulic system also needs to be controlled by a control system, resulting in the problem of high cost of the oil pressure system and its control equipment used in conjunction with the internal telescopic protection component 3.

[0036] See also Figure 2 、 Figure 6 、 Figure 9 、 Figure 10 and Figure 11The forklift assembly lifting device also includes a base oil storage mechanism 4, which includes a base shell 41 with an elongated structure, a reinforcement plate 42, and a connecting shell 44. The base shell 41 is fixed to the bottom of the base plate 11 by welding. Multiple reinforcement plates 42 are arranged inside the base shell 41. The two reinforcement plates 42 located below the internal telescopic protection component 3 form an oil storage chamber 43 with the base shell 41. The bottom of the base plate 11 is provided with a mounting port 111, and the bottom of the base cylindrical shell 31 is installed through the mounting port 111. The connecting shell 44 is located inside the oil storage chamber 43 and is fixed to the base shell 41. The top of the connecting shell 44 is connected to the bottom of the base cylindrical shell 31, and a connecting groove 45 is provided on the outer edge of the bottom of the connecting shell 44. The oil linkage pressurizing mechanism 5 includes a piston 51, a guide frame 52, and an arm 54. The guide frame 52 is fixed inside the base shell 41 and is provided with a guide groove 53. The piston member 51 is movably arranged inside the oil storage chamber 43. Guide grooves 46 are provided on the top of the base shell 41 and the top of the bottom plate 11. One end of the arm 54 passes through the guide groove 53 and the side wall of the oil storage chamber 43 is connected to the piston member 51. The arm 54 slides through the guide groove 46, and the top of the arm 54 is connected to the slider 18.

[0037] The forklift assembly jacking device in this embodiment adopts a base oil storage mechanism 4 as the oil storage part, and through the linkage design of the oil linkage pressurizing mechanism 5, it cooperates with the hydraulic jacking mechanism 1 to drive the internal telescopic protection component 3 to complete synchronous lifting to achieve the effect of preventing falling. The specific implementation method is: when the hydraulic cylinder 13 drives the cross frame 14 to drive the top support plate 12 to rise, the cross frame 14 will drive the bottom articulated seat Ⅱ17 to slide toward the side of the articulated seat Ⅰ16. While the articulated seat Ⅱ17 slides toward the side of the articulated seat Ⅰ16, it will also drive the slider 18 at the end to slide along the guide rail groove 19. The sliding slider 18 will drive the arm 54 in the oil linkage pressurizing mechanism 5 to move, and the moving arm 54 will push the piston 51 to squeeze the oil inside the oil storage chamber 43. After the oil inside the oil storage chamber 43 is squeezed by the piston member 51, the oil inside the oil storage chamber 43 will enter the connecting shell 44 through the connecting groove 45 at the bottom of the connecting shell 44, and enter the base cylindrical shell 31 through the connecting shell 44. Finally, the oil inside the base cylindrical shell 31, the middle cylindrical shell 32, and the top cylindrical shell 33 gradually increases and the pressure increases. The top of the top cylindrical shell 33 can be supported on the bottom of the top support plate 12, thereby playing a role in preventing falling.

[0038] As the middle cylinder shell 32 and the top cylinder shell 33 in the internal telescopic protection component 3 are gradually lifted upward, as the inner diameters of the upper middle cylinder shell 32 and the top cylinder shell 33 decrease, the piston 51 squeezes the oil storage chamber 43 to gradually increase the oil pressure inside the internal telescopic protection component 3. That is, as the top support plate 12 rises, the internal telescopic protection component 3 will have greater pressure to support the top support plate 12, thereby playing a better protective role.

[0039] The forklift assembly jacking device uses the stored oil in the base oil storage mechanism 4 to drive the cross frame 14 to lift the top support plate 12 through the hydraulic cylinder 13. At the same time, the arm frame 54 in the oil linkage pressurizing mechanism 5 is linked to push the piston 51 to squeeze the oil inside the oil storage chamber 43, so that the base cylinder shell 31, the middle cylinder shell 32, and the top cylinder shell 33 in the internal telescopic protection component 3 can be synchronously raised and moved to support the top support plate 12. In order to improve the stability of the top cylinder shell 33 during the jacking protection, an electric control valve can be set inside the connecting shell 44. During the jacking process, the flow of oil entering the internal telescopic protection component 3 is controlled. When the jacking is completed, the electric control valve is closed, and the oil inside the internal telescopic protection component 3 will not flow back, thereby improving the stability of the anti-fall protection.

[0040] When the top support plate 12 needs to be lowered and reset, the hydraulic cylinder 13 drives the cross frame 14 to move the top support plate 12 downward. Simultaneously, the articulated seat II 17 at the bottom of the cross frame 14 drives the slider 18 away from the articulated seat I 16. At this point, the slider 18, via the arm 54, drives the piston 51 within the oil reservoir 43. At this point, the electrically controlled valve within the connecting shell 44 opens, and the top support plate 12 descends, pressing down on the top shell 33 of the telescopic guard assembly 3 below. This forces the oil in the base shell 31, the middle shell 32, and the top shell 33 back into the oil reservoir 43 through the connecting shell 44 until the middle shell 32 and the top shell 33 are fully retracted into the base shell 31. The coordinated operation of the base oil storage mechanism 4 and the oil linkage pressurizing mechanism 5 replaces the traditional oil system and control system, enabling automatic and synchronous adjustment of the lift, reducing equipment costs while also achieving excellent performance.

[0041] Example 3 If the piston member 51 in the forklift assembly lifting device can be further adjusted, the sealing effect between the piston member 51 and the oil storage chamber 43 can be improved.

[0042] For specific settings, please refer to Figure 11 and Figure 12 The piston member 51 includes an intermediate block 511, an end block 512, and an elastic layer 516. The two end blocks 512 are integrally formed and disposed at both ends of the intermediate block 511. The end blocks 512 are arc-shaped on the side close to the connecting shell 44. The intermediate block 511 and the end blocks 512 are both provided with an inner cavity 514. The front side of the end wall of the end block 512 is provided with an arc surface 515. The end block 512 is provided with multiple groups of vertical grooves 513 on the side of the intermediate block 511. The elastic layer 516 wraps around the outside of the intermediate block 511 and the end block 512.

[0043] The piston member 51 has an inwardly concave arc-shaped end block 512 at each end. This increases the contact area between the sidewalls of the end blocks 512 and the inner wall of the base shell 41, while also reducing the material required in the middle of the piston member 51. The intermediate block 511 and the end blocks 512 can be made of a tough metal, such as stainless steel. When the intermediate block 511 and the end blocks 512 press against the connecting shell 44, the oil pressure within the oil reservoir 43 increases. Similarly, the oil pressure inside the inner groove 514, which is connected to the interior of the oil storage chamber 43, also increases synchronously. The pressure on the side wall of the inner groove 514 near the vertical groove 513 will gradually increase. The top and bottom walls of the inner groove 514 are also affected by the oil pressure, which increases the pressure on the piston 51, the guide frame 52 and the top and bottom walls of the oil storage chamber 43. The strong oil pressure will press the end block 512 close to the side wall of the oil storage chamber 43 to fit tightly. As the oil pressure inside the oil storage chamber 43 gradually increases, the overall sealing performance of the piston 51 is also gradually improved, making the piston 51 have a better sealing effect. The vertical groove 513 in the piston 51 makes the side wall of the end block 512 have better expansion performance. The provision of the elastic layer 516 further improves the fit between the middle block 511 and the interior of the oil storage chamber 43, further improving the sealing effect.

[0044] It should be noted that the specific models and specifications of the hydraulic cylinder 13 and the electrically controlled valve should be selected based on the actual specifications of the device. The specific selection and calculation methods are based on existing techniques in the art and will not be described in detail here. The power supply and principles of the hydraulic cylinder 13 and the electrically controlled valve are well known to those skilled in the art and will not be described in detail here.

[0045] The foregoing is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0046] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A forklift assembly lifting device, characterized in that: include: A hydraulic jacking mechanism (1), the hydraulic jacking mechanism (1) comprising a base plate (11), a top support plate (12), a hydraulic cylinder (13), a cross frame (14) and a locking assembly (15); the cross frame (14) is arranged between the top support plate (12) and the base plate (11), and supports the top support plate (12) for lifting and lowering adjustment via the hydraulic cylinder (13); the locking assembly (15) is mounted in cooperation with the base plate (11) and the cross frame (14); A covering plate (2), wherein the covering plate (2) is mounted on an end portion of the hydraulic jacking mechanism (1); An internal telescopic protection assembly (3) is located inside the cross frame (14), and the internal telescopic protection assembly (3) includes a base cylinder shell (31) with openings at both ends, a middle cylinder shell (32) with openings at both ends, and a top cylinder shell (33) with a bottom opening. The base cylinder shell (31) is arranged on the bottom plate (11), and multiple layers of the middle cylinder shell (32) are sequentially movably sealed and sleeved inside the base cylinder shell (31). The top cylinder shell (33) is movably sleeved at the innermost part of the middle cylinder shell (32). The base cylinder shell (31), the middle cylinder shell (32), and the top cylinder shell (33) are arranged with decreasing diameters layer by layer inwardly, and the base cylinder shell (31) is connected and coordinated with the hydraulic system.

2. A forklift assembly lifting device according to claim 1, characterized in that: The hydraulic jacking mechanism (1) further comprises an articulated seat I (16) and an articulated seat II (17), wherein the articulated seat I (16) is fixed inside the hydraulic jacking mechanism (1), and the articulated seat II (17) is slidably arranged inside the hydraulic jacking mechanism (1), and one end of the bottom of the cross frame (14) is articulated to the articulated seat I (16), and the other end of the bottom of the cross frame (14) is articulated to the articulated seat II (17).

3. A forklift assembly lifting device according to claim 2, characterized in that: The hydraulic jacking mechanism (1) further includes a slider (18), which is arranged at the end of the hinge seat II (17), and a guide rail groove (19) is provided on the inner side of the base plate (11) and matches the base plate (11).

4. A forklift assembly lifting device according to claim 2, characterized in that: One end of the top of the cross frame (14) is hinged to the top support plate (12), and the other end of the top of the cross frame (14) is slidably arranged with the top support plate (12).

5. The forklift assembly lifting device according to claim 1, characterized in that: The covering plate members (2) include two groups, and the two groups of covering plate members (2) are respectively installed at two ends of the bottom plate (11).

6. The forklift assembly lifting device according to claim 5, characterized in that: The covering plate (2) comprises a side cover plate (21) and a wedge-shaped end plate (22), wherein the wedge-shaped end plate (22) is fixedly arranged at the end of the bottom plate (11), and the side cover plate (21) is located outside the cross frame (14).

7. The forklift assembly lifting device according to claim 6, characterized in that: The covering plate (2) further includes a fixing plate (27), the fixing plate (27) being located inside the housing and close to one end of the side cover plate (21), and the fixing plate (27) being fixedly connected to the bottom plate (11).

8. The forklift assembly lifting device according to claim 7, characterized in that: One end of the side cover plate (21) is connected to a mounting plate (23) via a hinge (24), and the mounting plate (23) and the fixing plate (27) are detachably mounted.

9. The forklift assembly lifting device according to claim 8, characterized in that: A slot (25) is provided on the top of the mounting plate (23), and a positioning block (26) is provided on the side of the fixing plate (27) close to the side cover (21) and is engaged with the slot (25).

10. The forklift assembly lifting device according to claim 1, characterized in that: The internal telescopic protection assembly (3) further comprises a barrel band (34), wherein the barrel band (34) is arranged between adjacent middle barrel shells (32), the barrel band (34) is arranged between the base barrel shell (31) and the middle barrel shell (32), and the barrel band (34) is arranged between the middle barrel shell (32) and the top barrel shell (33).

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