A hydraulic pusher device for a cab lifting system

Abstract

The present application relates to the technical fields of hydraulic cylinder, and discloses a hydraulic pushing device for a cab lifting system, which comprises a cylinder body, a piston rod slidingly arranged in the cylinder body, a sleeve arranged on the inner wall of the middle part of the cylinder body, an annular groove arranged on the outer wall of the lower part of the piston rod, and a buffer self-locking assembly arranged in the annular groove; the buffer members can be in contact with the buffer grooves respectively, so that the buffer effect on the cab lifting is realized; and the side of the rubber member is in the form of an inclined surface structure, so that the contact area between the buffer member and the buffer groove is continuously increased during the extension of the piston rod, thereby gradually improving the buffer effect formed by the buffer member and the buffer groove, and greatly improving the buffer effect on the cab lifting.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hydraulic cylinders, and more particularly relates to a hydraulic pushing device for a cab lifting system. BACKGROUND

[0002] The hydraulic pushing device for a cab lifting system is an indispensable hydraulic pushing device for lifting and lowering the cab of a large vehicle. During the lifting process, an oil pump is generally used to push a hydraulic cylinder to complete the lifting or lowering. The performance of the hydraulic pushing device can ensure the safety and effectiveness during the lifting process.

[0003] The prior art has the following defects for the hydraulic cylinder:

[0004] In the prior art, after the piston rod of the hydraulic cylinder is extended, the piston rod needs to be stably worked at the current position and cannot be extended or retracted. However, in the existing self-locking hydraulic cylinder, a spring pushing pin is usually used for self-locking of the piston rod. However, the spring gradually weakens the spring force after long-term use, and the self-locking effect is not ideal, thereby affecting the self-locking effect of the piston rod.

[0005] In the prior art, during the extension or retraction of the piston rod of the hydraulic pushing device, due to the lack of a buffering structure, the piston rod moves rapidly, thereby affecting the stable lifting or lowering of the hydraulic pushing device.

[0006] Therefore, in view of the existing structure and defects, a hydraulic pushing device for a cab lifting system is provided to achieve a more practical and valuable purpose. SUMMARY

[0007] The present application provides a hydraulic pushing device for a cab lifting system to overcome the above-mentioned defects in the prior art.

[0008] The purpose and effect of the hydraulic pushing device for a cab lifting system are achieved by the following specific technical means:

[0009] The utility model provides a hydraulic pushing device for cab lifting system, including the cylinder, the inside of cylinder is equipped with the piston rod and slides, the inside wall of the middle part of cylinder is equipped with the sleeve, the outer wall of lower part of piston rod is equipped with annular groove, is equipped with buffer self locking assembly in annular groove, the inner wall of sleeve is equipped with a plurality of grooves, the inside of groove is equipped with rubber piece, one side inclined surface of rubber piece is equipped with a plurality of buffer groove, the inside of buffer groove is equipped with self locking groove, buffer self locking assembly includes annular block, the radial outer side of annular block is axially spaced and is equipped with a plurality of groups first sliding slot and second sliding slot, the first sliding slot is equipped with the pressing plate and slides in, one side of pressing plate is equipped with buffer piece, the inside of buffer piece is equipped with V type elastic piece, the middle part of V type elastic piece is equipped with self locking block, the inside of second sliding slot is equipped with the push plate and slides, one end of push plate is equipped with sealing assembly.

[0010] Preferably, the inside of the cylinder is provided with a first oil pressure cavity and a second oil pressure cavity, the inner wall of the annular block is fixedly connected with the inner wall of the annular groove, a plurality of groups of the first sliding slot and a plurality of groups of the second sliding slot are axially distributed, each group of the first sliding slot is circumferentially arrayed on the radial outer side of the annular block, and each group of the second sliding slot is circumferentially arrayed on the radial outer side of the annular block.

[0011] Preferably, one side of the self-locking block is in arc surface contact with one side of the self-locking groove, the other side of the self-locking block is in plane contact with the other side of the self-locking groove, and a first elastic piece is connected between the side of the pressing plate away from the buffer piece and the inside of the first sliding slot.

[0012] Preferably, the radial inner side of the annular block is provided with a plurality of first oil cavities and second oil cavities, a piston plate radially slides in the first oil cavities and the second oil cavities, and an elastic tube is connected between the piston plate and each of the pressing plates.

[0013] Preferably, a first electromagnetic valve is connected in communication between the first oil cavity and the first oil pressure cavity, a second electromagnetic valve is connected in communication between the second oil cavity and the first oil pressure cavity, a third electromagnetic valve is connected in communication between the second oil cavity and the second oil pressure cavity, and the second oil cavity is in communication with the inside of the buffer piece through the elastic tube.

[0014] Preferably, a second elastic piece is connected between the end of the push plate away from the sealing assembly and the inside of the second sliding slot, and a connecting channel is connected in communication between the second sliding slot and the first oil cavity.

[0015] Preferably, the sealing assembly axially slides in the groove, and one side of the sealing assembly is in frictional contact with the inclined surface of one side of the rubber piece.

[0016] Preferably, the sealing assembly comprises a movable block connected to one end of the push plate, a first sealing member is arranged on the side of the movable block away from the push plate, a second sealing member is arranged on one side of the middle part of the first sealing member, a third sealing member is arranged on the other side of the root of the first sealing member, and a third elastic member is arranged between the other side of the middle part of the first sealing member and one side of the movable block.

[0017] Preferably, the lower end of the cylinder body is provided with an oil passage carrier, the oil passage carrier is provided with a first oil pipe in communication with the first oil chamber, and the oil passage carrier is provided with a second oil pipe in communication with the second oil chamber.

[0018] Preferably, the upper end of the piston rod is provided with a shell.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The hydraulic pushing device for the cab lifting system of the present application is provided with a piston plate, an elastic pipe, a pressing plate, a buffer piece and a buffer groove, the hydraulic oil in the first oil chamber pushes the piston plate to move, the piston plate moves to drive the elastic pipe, the pressing plate and the buffer piece to move, the buffer pieces move into the buffer grooves respectively, the buffer pieces respectively contact with the buffer grooves, and the cab lifting is buffered.

[0021] The hydraulic pushing device for the cab lifting system of the present application is provided with a V-shaped elastic piece, a self-locking block and a self-locking groove, another part of the hydraulic oil in the first oil chamber is delivered into the second oil chamber through the second electromagnetic valve, the hydraulic oil in the second oil chamber is delivered into the buffer piece through the elastic pipe, the hydraulic oil in the buffer piece pushes the V-shaped elastic piece to deform, the deformed V-shaped elastic piece pushes the self-locking block to move, and the self-locking block moves into the self-locking groove.

[0022] The hydraulic pushing device for the cab lifting system of the application is characterized in that the hydraulic oil in the first oil cavity is delivered to the second sliding grooves through the connection channels by the setting of the push plate and the sealing assembly, the hydraulic oil in the second sliding grooves pushes the push plate to move, the push plate movement makes the sealing assembly tightly contact with the one side slope of the rubber piece, and there are several sealing assemblies between the outer wall of the annular block and the one side slope of the rubber piece, which can perform multiple sealing effects, thereby preventing the hydraulic oil in the first oil cavity from overflowing into the second oil cavity through the groove and improving the sealing effect of the sealing assembly.

[0023] The hydraulic pushing device for the cab lifting system of the application is characterized in that the hydraulic pushing device for the cab lifting system of the application is characterized in that the hydraulic oil in the first oil cavity is delivered to the second sliding grooves through the connection channels by the setting of the push plate and the sealing assembly, the hydraulic oil in the second sliding grooves pushes the push plate to move, the push plate movement makes the sealing assembly tightly contact with the one side slope of the rubber piece, and there are several sealing assemblies between the outer wall of the annular block and the one side slope of the rubber piece, which can perform multiple sealing effects, thereby preventing the hydraulic oil in the first oil cavity from overflowing into the second oil cavity through the groove and improving the sealing effect of the sealing assembly. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0025] The application will be further described below in combination with the drawings and embodiments.

[0026] Figure 1 It is a first isometric structural schematic diagram of the application;

[0027] Figure 2 It is a second isometric structural schematic diagram of the application;

[0028] Figure 3 It is a front view structural schematic diagram of the application;

[0029] Figure 4 It is Figure 3 It is a sectional view structural schematic diagram at A-A in the figure;

[0030] Figure 5 It is Figure 4 It is a local enlarged structural schematic diagram at C.

[0031] Figure 6 For Figure 5 Partial enlarged structural view at D;

[0032] Figure 7 For the left view structural schematic diagram of the application;

[0033] Figure 8 For Figure 7 Structural schematic diagram at B-B;

[0034] Figure 9 For Figure 8 Partial enlarged structural view at E.

[0035] Explanation of reference signs:

[0036] Cylinder 10, piston rod 11, oil passage carrier 12, first oil pipe 13, second oil pipe 14, shell 15, sleeve 16, groove 17, buffer groove 18, self-locking groove 19, annular groove 20, annular block 21, rubber part 22, first oil pressure cavity 23, second oil pressure cavity 24, first oil cavity 25, second oil cavity 26, piston plate 27, first electromagnetic valve 28, second electromagnetic valve 29, third electromagnetic valve 30, elastic tube 31, pressing plate 32, first sliding groove 33, second sliding groove 34, buffer part 35, V-shaped elastic part 36, self-locking block 37, first elastic part 38, push plate 39, sealing assembly 40, movable block 41, first sealing part 42, second sealing part 43, third sealing part 44, second elastic part 45, third elastic part 46, connecting channel 47. DETAILED DESCRIPTION

[0037] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0038] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that unless otherwise expressly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] The present application provides a hydraulic push device for cab lifting system, as shown in Figures 1-9 The present application provides a hydraulic push device for cab lifting system, as shown in

[0041] In specific implementation, the hydraulic oil in the first oil cavity 25 pushes the piston plate 27 to move, and the movement of the piston plate 27 drives the movement of the elastic pipes 31, the pressing plate 32 and the buffer 35. The movement of the buffer 35 into the buffer groove 18 respectively realizes the contact between the buffer 35 and the buffer groove 18, thereby achieving the buffering effect of the cab lifting. Moreover, the side of the rubber piece 22 is inclined, so that the contact area between the buffer 35 and the buffer groove 18 increases during the extension of the piston rod 11, thereby gradually improving the buffering effect of the buffer 35 and the buffer groove 18, and greatly improving the buffering effect of the cab lifting.

[0042] The other part of the hydraulic oil in the first oil cavity 25 is delivered to the second oil cavity 26 through the second electromagnetic valve 29, and the hydraulic oil in the second oil cavity 26 is delivered to the buffer 35 through the elastic pipe 31. The hydraulic oil in the buffer 35 deforms the V-shaped elastic piece 36, and the deformation of the V-shaped elastic piece 36 drives the movement of the self-locking block 37, so that the self-locking block 37 moves into the self-locking groove 19. Since the side of the self-locking block 37 is in contact with the arc surface of the self-locking groove 19, and the other side of the self-locking block 37 is in contact with the flat surface of the self-locking groove 19, the cooperation between the self-locking block 37 and the self-locking groove 19 can make the piston rod 11 extend smoothly and self-locking during the extension of the piston rod 11.

[0043] The hydraulic oil in the first oil cavity 25 is delivered into the second sliding groove 34 through the connecting channel 47, and the hydraulic oil in the second sliding groove 34 pushes the push plate 39 to move, and the movement of the push plate 39 makes the sealing assembly 40 tightly contact with the one side inclined surface of the rubber piece 22; and there are a plurality of sealing assemblies 40 between the outer wall of the annular block 21 and the one side inclined surface of the rubber piece 22, which can realize multiple sealing effects, thereby preventing the hydraulic oil in the first oil pressure cavity 23 from overflowing into the second oil pressure cavity 24 through the groove 17, and improving the sealing effect of the sealing assembly 40; and since the one side of the rubber piece 22 is in the form of an inclined surface, the contact between the one side inclined surface of the rubber piece 22 and the sealing assembly 40 is continuously improved during the extension of the piston rod 11, and the sealing effect of the sealing assembly 40 can be gradually improved.

[0044] Preferably, as shown in Figures 5-6 , the inside of the cylinder body 10 is provided with the first oil pressure cavity 23 and the second oil pressure cavity 24, the inner wall of the annular block 21 is fixedly connected with the inner wall of the annular groove 20, a plurality of groups of first sliding grooves 33 and a plurality of groups of second sliding grooves 34 are distributed in axial staggered manner, each group of first sliding grooves 33 is circumferentially arrayed on the radial outer side of the annular block 21, and each group of second sliding grooves 34 is circumferentially arrayed on the radial outer side of the annular block 21.

[0045] Preferably, as shown in Figures 5-6 , one side of the self-locking block 37 is in contact with one side arc surface of the self-locking groove 19, the other side of the self-locking block 37 is in contact with the other side plane of the self-locking groove 19, and the side of the pressing plate 32 away from the buffer 35 is connected with the inside of the first sliding groove 33 and is provided with the first elastic piece 38.

[0046] Preferably, as shown in Figures 5-8 , the radial inner side of the annular block 21 is provided with a plurality of first oil cavities 25 and second oil cavities 26, the piston plate 27 is slidably arranged in the first oil cavity 25 and the second oil cavity 26 in the radial direction, and the piston plate 27 is connected with the plurality of pressing plates 32 and is provided with one elastic tube 31.

[0047] Preferably, as shown in Figures 5-8 , the first oil cavity 25 is communicated with the first oil pressure cavity 23 and is provided with the first electromagnetic valve 28, the second oil cavity 26 is communicated with the first oil pressure cavity 23 and is provided with the second electromagnetic valve 29, the first oil cavity 25 is communicated with the second oil pressure cavity 24 and is provided with the third electromagnetic valve 30, and the second oil cavity 26 is communicated with the inside of the buffer 35 through the elastic tube 31.

[0048] Preferably, as shown in Figures 5-8 , one end of the push plate 39 away from the sealing assembly 40 is connected with the inside of the second sliding groove 34 and is provided with the second elastic piece 45, and the second sliding groove 34 is communicated with the first oil cavity 25 and is provided with the connecting channel 47.

[0049] Preferably, as shown in Figures 5-8 The sealing assembly 40 is axially slid in the groove 17, and one side of the sealing assembly 40 is in frictional contact with one side of the inclined surface of the rubber part 22.

[0050] Preferably, as shown in Figure 6 The sealing assembly 40 includes a movable block 41 connected to one end of the push plate 39, and the side of the movable block 41 away from the push plate 39 is inclined to be provided with a first sealing part 42, the middle side of the first sealing part 42 is inclined to be provided with a second sealing part 43, the root side of the first sealing part 42 is inclined to be provided with a third sealing part 44, and the other side of the middle of the first sealing part 42 is connected with the side of the movable block 41 and is provided with a third elastic part 46.

[0051] Preferably, as shown in Figures 1-2 The lower end of the cylinder body 10 is provided with an oil passage carrier 12, the oil passage carrier 12 is provided with a first oil pipe 13 in communication with the first oil chamber 23, and the oil passage carrier 12 is provided with a second oil pipe 14 in communication with the second oil chamber 24.

[0052] Preferably, as shown in Figures 1-2 The upper end of the piston rod 11 is provided with a shell 15.

[0053] In the initial state, the first elastic part 38 is in a normal state, and the second elastic part 45 is in a compressed state, and under the elastic force of the second elastic part 45, the sealing assembly 40 is in close contact with one side of the rubber part 22.

[0054] The specific use method of the present application is as follows:

[0055] A hydraulic pushing device for a cab lifting system, which is usually composed of core components such as a hydraulic oil pump, a lifting cylinder, a hydraulic lock, and a high-pressure oil pipe. Among them, the lifting cylinder adopts a double-pipe hydraulic cylinder (usually referred to as a double-acting hydraulic cylinder, equipped with two independent oil pipes to control oil inlet and oil return) which has many advantages in terms of work efficiency, control accuracy, safety, and adaptability.

[0056] When the cab is lifted, the hydraulic oil pump starts to work, and hydraulic oil is delivered to the oil circuit carrier 12 through the high-pressure oil pipe. The oil circuit carrier 12 delivers the hydraulic oil to the first oil chamber 23 through the first oil pipe 13. Part of the hydraulic oil in the first oil chamber 23 is delivered to the first oil cavity 25 through the first electromagnetic valve 28. The hydraulic oil in the first oil cavity 25 is delivered to the second sliding chute 34 through the connecting channel 47. The hydraulic oil in the second sliding chute 34 pushes the push plate 39 to move, and the movement of the push plate 39 makes the sealing assembly 40 tightly contact with the one side of the rubber piece 22. There are several sealing assemblies 40 between the outer wall of the annular block 21 and the one side of the rubber piece 22, which can realize multiple sealing effects, thereby preventing the hydraulic oil in the first oil chamber 23 from overflowing into the second oil chamber 24 through the groove 17, and improving the sealing effect of the sealing assembly 40. In addition, the one side of the rubber piece 22 is in a slope structure, and the contact between the one side of the rubber piece 22 and the sealing assembly 40 is continuously improved during the extension of the piston rod 11, thereby gradually improving the sealing effect of the sealing assembly 40. The movement of the push plate 39 drives the movement of the movable block 41, thereby reducing the space between the movable block 41 and the one side of the rubber piece 22. The movement of the movable block 41 extrudes the first sealing piece 42, the second sealing piece 43 and the third sealing piece 44, and the third elastic piece 46 elastically supports the first sealing piece 42, so that one end of the first sealing piece 42, the second sealing piece 43 and the third sealing piece 44 is always in contact with the one side of the rubber piece 22, thereby realizing multiple sealing effects of the first sealing piece 42, the second sealing piece 43 and the third sealing piece 44 in cooperation with the rubber piece 22 on the groove 17.

[0057] Then, the hydraulic oil in the first oil cavity 25 pushes the piston plate 27 to move, and the movement of the piston plate 27 drives the movement of the elastic pipe 31, the pressing plate 32 and the buffer piece 35. The movement of the buffer piece 35 enters the buffer groove 18, thereby realizing the buffering effect of the cab lifting through the contact between the buffer piece 35 and the buffer groove 18. In addition, the one side of the rubber piece 22 is in a slope structure, and the contact area between the buffer piece 35 and the buffer groove 18 is continuously increased during the extension of the piston rod 11, thereby gradually improving the buffering effect of the buffer piece 35 and the buffer groove 18, and greatly improving the buffering effect of the cab lifting. The movement of the pressing plate 32 produces elastic force by stretching the first elastic piece 38.

[0058] Then, another part of the hydraulic oil in the first oil chamber 23 is delivered into the second oil chamber 26 through the second electromagnetic valve 29, the hydraulic oil in the second oil chamber 26 is delivered into the buffer 35 through the elastic pipe 31, the hydraulic oil in the buffer 35 pushes the V-shaped elastic piece 36 to deform, the V-shaped elastic piece 36 is deformed to push the self-locking block 37 to move, and the self-locking block 37 moves into the self-locking groove 19. Since one side of the self-locking block 37 is in contact with the arc surface of one side of the self-locking groove 19, and the other side of the self-locking block 37 is in contact with the plane of the other side of the self-locking groove 19, the piston rod 11 can be smoothly extended and self-locked and limited in the process of extending the piston rod 11 by cooperation of the self-locking block 37 and the self-locking groove 19. The piston rod 11 and the annular block 21 move to drive a plurality of self-locking blocks 37 to move, the self-locking blocks 37 are in contact with the arc surface of the self-locking groove 19 due to upward movement of the self-locking blocks 37, the self-locking blocks 37 are guided by the self-locking groove 19, the self-locking blocks 37 move, and the self-locking blocks 37 move to compress the V-shaped elastic piece 36 to generate elastic force. Under the action of the elastic force of the V-shaped elastic piece 36, the self-locking blocks 37 can be re-moved into the previous self-locking groove 19, so as to realize the buffering effect of the upward movement of the self-locking blocks 37. Since the other side of the self-locking block 37 is in contact with the plane of the other side of the self-locking groove 19, the downward movement of the piston rod 11 and the annular block 21 can be self-locked and limited by cooperation of the self-locking block 37 and the self-locking groove 19.

[0059] Finally, the hydraulic oil in the first oil chamber 23 pushes the annular block 21 and the piston rod 11 to extend, so as to realize the lifting of the cab.

[0060] When the cab is lowered, the hydraulic oil pump starts to work, the hydraulic oil is delivered into the oil circuit carrier 12 through the high-pressure oil pipe, the oil circuit carrier 12 delivers the hydraulic oil into the second oil chamber 24 through the second oil pipe 14, the hydraulic oil in the first oil chamber 23 is returned to the oil circuit carrier 12 through the first oil pipe 13, and the returned hydraulic oil in the oil circuit carrier 12 flows back into the oil tank through the high-pressure oil pipe. Under the action of the elastic force of the V-shaped elastic piece 36, the hydraulic oil in the buffer 35 is returned to the second oil chamber 26 through the elastic pipe 31, the hydraulic oil in the second oil chamber 26 is returned to the first oil chamber 23 through the second electromagnetic valve 29, the self-locking block 37 is separated from the self-locking groove 19, so as to enable the annular block 21 and the piston rod 11 to be smoothly retracted.

[0061] Then, the hydraulic oil in the second oil chamber 24 is delivered into the first oil chamber 25 through the third electromagnetic valve 30, the hydraulic oil in the first oil chamber 25 is delivered into the second sliding groove 34 through a plurality of connecting channels 47, so as to enable the sealing assembly 40 to be in close contact with one side of the inclined surface of the rubber piece 22 by the hydraulic oil in the second sliding groove 34 and the elastic force of the second elastic piece 45, and to maintain the multiple sealing effect between the plurality of sealing assemblies 40 and one side of the rubber piece 22.

[0062] Then, the hydraulic oil in the first oil chamber 25 pushes the piston plate 27 to move, the piston plate 27 moves to drive a plurality of elastic tubes 31, a pressing plate 32 and a plurality of buffer pieces 35 to move, the plurality of buffer pieces 35 respectively move into a plurality of buffer grooves 18, so that the plurality of buffer pieces 35 respectively contact with the plurality of buffer grooves 18, thereby achieving the buffering effect of the cab lowering.

[0063] Finally, the hydraulic oil in the second oil chamber 24 pushes the annular block 21 and the piston rod 11 to move downward, thereby achieving the stable lowering of the cab.

[0064] The buffering and self-locking assembly can buffer and self-lock the cab lifting, and buffer the cab lowering, so that the cab can be stably lifted and lowered.

[0065] Embodiments of the present application are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the application to the precise form disclosed. Many modifications and variations are possible in light of this disclosure. Embodiments are chosen and described in order to provide the best illustration of the principles of the application and its practical application, and to thereby enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A hydraulic pusher device for a cab lifting system, characterized by: The application relates to a buffer self-locking assembly for a cab lifting device, which comprises a cylinder (10), the inside of the cylinder (10) being provided with a piston rod (11), the middle inner wall of the cylinder (10) being provided with a sleeve (16), the lower outer wall of the piston rod (11) being provided with an annular groove (20), the annular groove (20) being provided with a buffer self-locking assembly, the inner wall of the sleeve (16) being provided with a plurality of grooves (17), the inside of the grooves (17) being provided with rubber parts (22), one side of the rubber parts (22) being provided with a plurality of buffer grooves (18), and the inner side of the buffer grooves (18) being provided with self-locking grooves (19). The buffer self-locking assembly comprises annular blocks (21), a plurality of groups of first sliding grooves (33) and second sliding grooves (34) being axially spaced apart on the radial outer side of the annular blocks (21), a pressing plate (32) being slidably arranged in the first sliding grooves (33), a buffer part (35) being arranged on one side of the pressing plate (32), a V-shaped elastic part (36) being arranged in the buffer part (35), a self-locking block (37) being arranged on the middle part of the V-shaped elastic part (36), and a pushing plate (39) being slidably arranged in the second sliding grooves (34), and a sealing assembly (40) being arranged on one end of the pushing plate (39). The buffer part (35) can enter the buffer grooves (18), so that the buffer part (35) is in contact with the buffer grooves (18), buffer action for cab lifting is realized, hydraulic oil in the buffer part (35) can push the V-shaped elastic part (36) to deform, the V-shaped elastic part (36) is deformed to push the self-locking block (37) to move, and the self-locking block (37) moves into the self-locking grooves (19).

2. A hydraulic push device for a cab lifting system according to claim 1, characterized in that: The inside of the cylinder (10) is provided with a first oil pressure cavity (23) and a second oil pressure cavity (24), the inner wall of the annular block (21) is fixedly connected with the inner wall of the annular groove (20), a plurality of groups of the first sliding grooves (33) and a plurality of groups of the second sliding grooves (34) are axially distributed in a staggered mode, each group of a plurality of the first sliding grooves (33) is circumferentially arrayed on the radial outer side of the annular block (21), and each group of a plurality of the second sliding grooves (34) is circumferentially arrayed on the radial outer side of the annular block (21).

3. A hydraulic pusher apparatus for a cab lifting system as defined in claim 1, wherein: One side of the self-locking block (37) is in contact with one side arc surface of the self-locking groove (19), the other side of the self-locking block (37) is in contact with the other side plane of the self-locking groove (19), and a first elastic part (38) is arranged between one side of the pressing plate (32) away from the buffer part (35) and the inside of the first sliding groove (33).

4. A hydraulic pusher apparatus for a cab lifting system according to claim 2, wherein: The radial inner side of the annular block (21) is provided with a plurality of first oil cavities (25) and second oil cavities (26), a piston plate (27) is slidably arranged in the first oil cavities (25) and the second oil cavities (26) in a radial direction, and one elastic tube (31) is arranged between the piston plate (27) and each of the pressing plates (32).

5. A hydraulic push device for a cab lifting system according to claim 4, characterized in that: The first oil cavity (25) is provided with a first electromagnetic valve (28) in communication with the first oil pressure cavity (23), the second oil cavity (26) is provided with a second electromagnetic valve (29) in communication with the first oil pressure cavity (23), the first oil cavity (25) is provided with a third electromagnetic valve (30) in communication with the second oil pressure cavity (24), and the second oil cavity (26) is in communication with the inside of the buffer (35) through the elastic pipe (31).

6. A hydraulic push device for a cab lifting system according to claim 4, characterized in that: The end of the push plate (39) away from the sealing assembly (40) is connected with the inside of the second sliding groove (34) and is provided with a second elastic member (45), and the second sliding groove (34) is provided with a connecting channel (47) in communication with the first oil cavity (25).

7. A hydraulic push device for a cab lifting system according to claim 6, characterized in that: The sealing assembly (40) axially slides in the groove (17), and one side of the sealing assembly (40) is in frictional contact with the inclined surface of one side of the rubber member (22).

8. A hydraulic push device for a cab lifting system according to claim 7, characterized in that: The sealing assembly (40) comprises a movable block (41), one end of the movable block (41) is connected with the push plate (39), one side of the movable block (41) away from the push plate (39) is obliquely provided with a first sealing member (42), one side of the middle part of the first sealing member (42) is obliquely provided with a second sealing member (43), one side of the root of the first sealing member (42) is obliquely provided with a third sealing member (44), and the other side of the middle part of the first sealing member (42) and one side of the movable block (41) are connected and provided with a third elastic member (46).

9. A hydraulic pusher apparatus for a cab lifting system as defined in claim 2, wherein: The lower end of the cylinder body (10) is provided with an oil circuit carrier (12), the oil circuit carrier (12) is provided with a first oil pipe (13) in communication with the first oil pressure cavity (23), and the oil circuit carrier (12) is provided with a second oil pipe (14) in communication with the second oil pressure cavity (24).

10. A hydraulic pusher apparatus for a cab lifting system as defined in claim 1, wherein: The upper end of the piston rod (11) is provided with a shell (15).

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