Electro-hydraulic push rod lifting mechanism

Abstract

The utility model discloses an electric-hydraulic push rod lifting mechanism which comprises an installation base, and the top face of the installation base is a horizontal plane. The lifting assembly is arranged on the top face of the mounting base and comprises an electric-hydraulic push rod and a shear fork mechanism, and the electric-hydraulic push rod can rotate relative to the shear fork mechanism and push the shear fork mechanism to achieve vertical lifting motion. The electric-hydraulic push rod is arranged to push the movable connecting rod to move so that the lifting platform can rapidly and accurately conduct vertical lifting motion, the limiting groove is formed in the limiting rack so that the limiting groove can coincide with the side face of the limiting block and apply pressure to the side face of the limiting block, and then the electric-hydraulic push rod is arranged to drive the limiting rack to move. And when the pressure of the limiting groove on the limiting block is parallel to the movement direction of the limiting rack, the anti-falling function of the lifting assembly is achieved, and the production safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of lifting platform technology, specifically to an electro-hydraulic actuator lifting mechanism. Background Technology

[0002] The lifting platform uses a scissor mechanism to achieve vertical lifting motion, which can convert small horizontal displacement into large vertical displacement while maintaining high stability and load-bearing capacity. It consists of a multi-link structure composed of multiple cross-arranged links. The links usually appear in pairs and are connected together by hinges to form a scissor-like shape. Its working principle is based on the parallelogram law of the links. When the bottom drive device retracts the lowest link, the entire mechanism will retract like scissors, thereby lifting the platform or load above. Conversely, if the drive device pushes the lowest link, the mechanism unfolds and the platform descends accordingly.

[0003] The existing lifting platform drive devices mainly include hydraulic cylinders and servo screw mechanisms. Hydraulic cylinders have a slow movement speed, resulting in a slow lifting speed for the lifting platform. They also require a complex hydraulic system, and both initial debugging and subsequent maintenance require high labor costs. Servo screw mechanisms have a high failure rate, and their lifting speed depends on the screw pitch and the servo motor speed. Excessive servo motor speed can easily lead to failure, resulting in a small adjustable range for the lifting speed of servo screw lifting platforms. Furthermore, due to the structure of the servo screw mechanism, the scissor fork cannot fully extend, thus the minimum height of the lifting platform is higher than that of hydraulic cylinder lifting platforms, further narrowing its applicable scope. Utility Model Content

[0004] This utility model addresses the problems of slow lifting speed and insufficient minimum height of existing lifting platforms by providing an electro-hydraulic actuator lifting mechanism. The specific technical solution is as follows:

[0005] This utility model includes: a mounting base, the top surface of which is a horizontal plane; and a lifting assembly disposed on the top surface of the mounting base, the lifting assembly including an electro-hydraulic actuator and a scissor fork mechanism, the electro-hydraulic actuator being rotatable relative to the scissor fork mechanism and driving the scissor fork mechanism to achieve vertical lifting movement.

[0006] Furthermore, the mounting base includes: a frame, a lifting assembly connected to the frame; and slide rails disposed on opposite sides of the frame, the opposite sides of the slide rails forming a groove, the length direction of the groove being the same as the length direction of the slide rail, and the moving end of the lifting assembly moving along the inner side of the groove.

[0007] Preferably, the fixed end of the electro-hydraulic actuator is connected to the frame, and the movement direction of the moving end of the electro-hydraulic actuator is the same as the length direction of the slide rail; the lifting assembly also includes a rotating link connected to the frame at one end, and the other end of the rotating link is connected to one side of the lifting platform. The top surface of the lifting platform is a horizontal plane, and the opposite side of the lifting platform is connected to one end of a moving link. The other end of the moving link is connected to the inner surface of the slide groove through a roller. A transverse link is connected between the ends of the moving links on both sides of the frame that are connected to the slide groove. The moving end of the electro-hydraulic actuator is connected to the transverse link, and the length direction of the transverse link is perpendicular to the movement direction of the electro-hydraulic actuator; the rotating link, the moving link, and the lifting platform form a scissor fork mechanism.

[0008] Preferably, the device further includes a fall protection assembly disposed on one side of the frame near the moving end of the electro-hydraulic actuator. The fall protection assembly includes: a limiting rack with one end connected to the moving end of the electro-hydraulic actuator, the length direction of the limiting rack being the same as the movement direction of the electro-hydraulic actuator, and a limiting groove formed on one side of the limiting rack; and a limiting cylinder disposed on the frame, the moving end of the limiting cylinder being connected to a blocking block, the movement direction of the blocking block being perpendicular to the length direction of the limiting rack, and the limiting cylinder pushing the limiting block to embed into the limiting groove to fix the limiting rack.

[0009] Preferably, the fall arrestor further includes: a paddle disposed at the moving end of the limit cylinder, the movement trajectory of which is the same as that of the limit block; and a first limit switch and a second limit switch disposed on the frame, wherein when the limit block moves toward the limit rack, the paddle contacts the first limit switch when the limit block moves away from the limit rack, and the paddle contacts the second limit switch when the limit block moves closer to the limit rack.

[0010] Preferably, the system further includes a limiting component, which comprises: an adjusting bolt connected at one end to the slide rail, wherein the side of the slide groove and the end face of the adjusting bolt form the stroke of a moving link, and the adjusting bolt can adjust the position relative to the slide rail; a low-position sensor disposed on the opposite side of the frame, wherein the limiting rack can block or not block the detection light of the low-position sensor during the movement of the limiting rack; and a low-position limiting member disposed on the top surface of the frame, wherein the top of the low-position limiting member can prevent the lifting platform from moving further downward, and the low-position limiting member can adjust its own position relative to the frame.

[0011] Preferably, the side of the slide rail has multiple through holes that penetrate the slide groove.

[0012] Preferably, the limiting component further includes a high-position limit switch, which is disposed at one end of the slide rail relative to the rotating connecting rod and can contact the side of the frame.

[0013] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0014] This invention enables the lifting platform to perform rapid and precise vertical lifting movements by setting an electro-hydraulic actuator to drive the moving linkage. Secondly, a limiting groove is formed on the limiting rack so that it overlaps with the side of the limiting block and applies pressure to the side of the limiting block. Then, the electro-hydraulic actuator drives the limiting rack to move. When the pressure of the limiting groove on the limiting block is parallel to the movement direction of the limiting rack, the lifting component achieves the anti-fall function and improves production safety. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0016] Figure 2 for Figure 1 Partial schematic diagram;

[0017] Figure 3 This is a schematic diagram of the anti-fall component structure.

[0018] In the diagram: 1. Mounting base; 11. Frame; 12. Slide rail; 13. Slide groove; 14. Through hole; 2. Lifting assembly; 21. Electro-hydraulic actuator; 22. Moving link; 23. Rotating link; 24. Lifting platform; 25. Lateral link; 26. Roller; 3. Fall protection assembly; 31. Limit rack; 32. Limit groove; 33. Limit cylinder; 34. Paddle; 35. Block; 36. First limit switch; 37. Second limit switch; 4. Limit assembly; 41. Adjusting bolt; 42. Low position sensor; 43. Low position limit component; 44. High position limit switch. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0021] like Figure 1As shown, this embodiment includes: a mounting base 1, the top surface of which is a horizontal plane; and a lifting assembly 2 disposed on the top surface of the mounting base 1. The lifting assembly 2 includes an electro-hydraulic actuator 21 and a scissor fork mechanism. The electro-hydraulic actuator 21 can rotate relative to the scissor fork mechanism and push the scissor fork mechanism to achieve vertical lifting movement.

[0022] Specifically, the mounting base 1 is placed on a horizontal surface, and its top surface is also horizontal, so that the lifting component 2 moves vertically up and down. Secondly, the driving device of the lifting component 2 is an electro-hydraulic actuator 21. The electro-hydraulic actuator 21 is a device that converts the rotational motion of the electric motor into linear motion. It combines the advantages of electric motors and hydraulic systems. It can apply a large thrust to the scissor fork mechanism, accurately control its own movement distance, and quickly push the scissor fork mechanism, thereby controlling the lifting height and lifting speed of the scissor fork mechanism. When it is working, the electric motor drives the oil pump to generate pressurized oil, which pushes it into one side of the oil cylinder, thereby pushing the piston to move, realizing the push or pull of the scissor fork mechanism, and thus controlling the rise or fall of the scissor fork mechanism.

[0023] The moving end of the electro-hydraulic actuator 21 is rotatably connected to the scissor fork mechanism, and the fixed end of the electro-hydraulic actuator 21 is rotatably connected to the mounting base 1. This allows both ends of the electro-hydraulic actuator 21 to rotate relative to each other when pushing the scissor fork mechanism, thereby enabling the electro-hydraulic actuator 21 to be installed at the bottom of the scissor fork mechanism. This allows the electro-hydraulic actuator 21 to rotate at a large angle when pushing the scissor fork mechanism, thus ensuring that the minimum height meets specific production requirements.

[0024] like Figure 2 As shown, the mounting base 1 includes: a frame 11, a lifting assembly 2 connected to the frame 11; and slide rails 12 disposed on opposite sides of the frame 11, the opposite sides of the slide rails 12 forming a groove 13, the length direction of the groove 13 being the same as the length direction of the slide rails 12, and the moving end of the lifting assembly 2 moving along the inner side of the groove 13.

[0025] Specifically, the bottom end of the lifting assembly 2 is usually connected to the frame 11 through a moving end and a rotating end. The moving end of the electro-hydraulic actuator 21 pushes the moving end of the lifting assembly 2 to make the rotating end rotate around the frame 11, thereby realizing the lifting and lowering of the scissor fork mechanism. The length direction of the slide rail 12 is the same as the length direction of one side of the frame 11, and the length direction of the slide rail 12 is the direction of movement of the electro-hydraulic actuator 21. The slide groove 13 is formed on the opposite side of the slide rail 12. When the moving end of the lifting assembly 2 is slidably connected to the inner side of the slide groove 13, the electro-hydraulic actuator 21 can push the moving end of the lifting assembly 2 to move along the slide groove 13, that is, along the side of the frame 11, thereby enabling the lifting assembly 2 to achieve lifting and lowering movement.

[0026] Furthermore, multiple through holes 14 are formed on the side of the slide rail 12, which penetrate the slide groove 13.

[0027] Specifically, the axis of the through hole 14 is located on the same horizontal plane. When a positioning pin with the same diameter as the through hole 14 is inserted into the through hole 14, it can divide the slide groove 13 into two parts, thereby restricting the movement of the moving end of the lifting assembly 2. When the positioning pin is inserted into the through hole 14 between the moving end and the rotating end, it can restrict the lifting assembly 2 from continuing to rise. When the positioning pin is inserted into the through hole 14 not between the moving end and the rotating end, it can restrict the lifting assembly 2 from continuing to descend, thereby achieving the limiting function.

[0028] Furthermore, the fixed end of the electro-hydraulic actuator 21 is connected to the frame 11, and the movement direction of the moving end of the electro-hydraulic actuator 21 is the same as the length direction of the slide rail 12; the lifting assembly 2 also includes a rotating connecting rod 23 with one end connected to the frame 11, and the other end of the rotating connecting rod 23 is connected to one side of the lifting platform 24. The top surface of the lifting platform 24 is a horizontal plane, and the opposite side of the lifting platform 24 is connected to one end of the moving connecting rod 22. The other end of the moving connecting rod 22 is connected to the inner surface of the slide groove 13 through the roller 26. A transverse connecting rod 25 is connected between the ends of the moving connecting rods 22 on both sides of the frame 11 and the ends connected to the slide groove 13. The moving end of the electro-hydraulic actuator 21 is connected to the transverse connecting rod 25, and the length direction of the transverse connecting rod 25 is perpendicular to the movement direction of the electro-hydraulic actuator 21; the rotating connecting rod 23, the moving connecting rod 22, and the lifting platform 24 form a scissor fork mechanism.

[0029] Specifically, the fixed end of the electro-hydraulic actuator 21 is rotatably connected to the frame 11, allowing it to rotate relative to the frame 11 when pushing the lifting assembly 2. Secondly, the bottom end of the rotating link 23 is rotatably connected to the frame 11, serving as the rotating end of the lifting assembly 2. Its top end is rotatably connected to the lifting platform 24. The bottom end of the moving link 22 moves along the slide groove 13, serving as the moving end of the lifting assembly 2. The rotating link 23 and the moving link 22 are rotatably connected at their middle positions, so that when the electro-hydraulic actuator 21 pushes the bottom end of the moving link 22 along the slide groove 13, it can drive the rotating link 23 to rotate around the frame 11, thereby driving the lifting platform 24, which is rotatably connected to the top ends of both, to achieve lifting motion. The scissor mechanism is a parallelogram mechanism. Because the bottom ends of both the moving link 22 and the rotating link 23 are connected to the frame 11 and are both on a horizontal plane, their top ends are always on a horizontal plane, thus making the top surface of the lifting platform 24 horizontal.

[0030] like Figure 3As shown, this embodiment also includes a fall protection component 3 disposed on the side of the frame 11 near the moving end of the electro-hydraulic actuator 21. The fall protection component 3 includes: a limiting rack 31 with one end connected to the moving end of the electro-hydraulic actuator 21, the length direction of the limiting rack 31 being the same as the movement direction of the electro-hydraulic actuator 21, and a limiting groove 32 formed on one side of the limiting rack 31; and a limiting cylinder 33 disposed on the frame 11, the moving end of the limiting cylinder 33 being connected to a blocking block 35, the movement direction of the blocking block 35 being perpendicular to the length direction of the limiting rack 31, and the limiting cylinder 33 pushing the limiting block to embed into the limiting groove 32 to fix the limiting rack 31.

[0031] Specifically, when the lifting assembly 2 rises to the designated height, even if the electro-hydraulic actuator 21 does not apply thrust to the lifting assembly 2, the anti-fall assembly 3 can still restrict the movement of the moving end of the moving link 22, thereby restricting the descent of the lifting assembly 2, so that the lifting assembly 2 can stably maintain the designated height.

[0032] Secondly, one end of the limiting rack 31 is connected to the moving end of the electro-hydraulic push rod 21, and its length direction is the moving direction of the electro-hydraulic push rod 21, so that limiting the movement of the limiting rack 31 can limit the movement of the electro-hydraulic push rod 21, thereby limiting the movement of the moving end of the moving link 22. The limiting cylinder 33 is fixedly connected to the frame 11 by bolts. Its extension and retraction direction is perpendicular to the movement direction of the electro-hydraulic push rod 21. A limiting block is fixedly connected to the extension and retraction end of the limiting cylinder 33. There is an elastic connection between the limiting block and the extension and retraction end of the limiting cylinder 33. The limiting cylinder 33 can push the limiting block to move relative to the limiting rack 31. Furthermore, a limiting groove is formed on the side of the limiting rack 31 near the limiting block. When the moving end of the electro-hydraulic push rod 21 pulls the moving end of the moving link 22 to raise the lifting assembly 2, the limiting groove slides relative to the inclined surface of the limiting block. A portion of the pressure component applied by the side of the limiting groove to the side of the limiting block is parallel to the movement direction of the limiting rack 31 and pushes the limiting block toward the limiting cylinder 33. The spaced limiting grooves continuously push the limiting block towards the limiting cylinder 33. Another component force balances the elastic force applied by the limiting block and the elastic element of the limiting cylinder 33, ensuring that the limiting block remains in contact with the limiting groove. When the moving end of the electro-hydraulic push rod 21 suddenly pushes the moving end of the moving link 22, it pushes the limiting rack 31 away from the lifting assembly 2. At this time, the lifting assembly 2 is about to descend, but the pressure applied by the other side of the limiting groove to the other side of the limiting block is parallel to the moving direction of the limiting rack 31. No other component force compresses the elastic element, causing the limiting block to retract. This allows the limiting block to restrict the limiting rack 31 from continuing to move through the limiting groove, thus preventing the lifting assembly 2 from falling and improving safety during production.

[0033] Furthermore, the fall arrestor 3 also includes: a paddle 34 disposed at the moving end of the limit cylinder 33, the movement trajectory of the paddle 34 being the same as the movement trajectory of the limit block; and a first limit switch 36 and a second limit switch 37 disposed on the frame 11. During the movement of the limit block toward the limit rack 31, when the limit block moves away from the limit rack 31, the paddle 34 contacts the first limit switch 36, and when the limit block moves closer to the limit rack 31, the paddle 34 contacts the second limit switch 37.

[0034] Specifically, the first limit switch 36 is closer to the limiting cylinder 33 than the second limit switch 37. The limiting block and the paddle 34 move simultaneously relative to the limiting rack 31. When the limiting rack 31 moves to the right, it compresses the limiting block towards the limiting cylinder 33, thereby causing the paddle 34 to contact the first limit switch 36. This causes the first limit switch 36 to send a signal indicating that the limiting rack 31 and the limiting block have separated. Under the action of the elastic element, the limiting block moves closer to the limiting rack 31 again, causing the paddle 34 to move towards the limiting rack 31. This triggers the second limit switch 37, which is closer to the limiting rack 31. The second limit switch 37 then sends a signal indicating that the side of the limiting rack 31 coincides with the side of the limiting block, thereby constantly monitoring the anti-fall status of the limiting rack 31 and improving production safety.

[0035] Furthermore, it also includes a limiting component 4, which includes: an adjusting bolt 41 connected at one end to the slide rail 12, the side of the slide groove 13 and the end face of the adjusting bolt 41 forming the stroke of the moving link 22, the adjusting bolt 41 being able to adjust the position relative to the slide rail 12; a low-position sensor 42 disposed on the opposite side of the frame 11, the limiting rack 31 being able to block or not block the detection light of the low-position sensor 42 during the movement; and a low-position limiting member 43 disposed on the top surface of the frame 11, the top of the low-position limiting member 43 being able to prevent the lifting platform 24 from continuing to move downward, the low-position limiting member 43 being able to adjust its own position relative to the frame 11.

[0036] Specifically, the end of the adjusting bolt 41 protruding from the slide rail 12 faces the rotating connecting rod 23. It is connected to the slide rail 12 by a thread, so that when it rotates relative to the slide rail 12, the distance between its end face and the slide rail 12 can be adjusted, thereby adjusting the stroke of the roller 26 which is rotatably connected to the bottom end of the moving connecting rod 22. Secondly, the end of the adjusting bolt 41 that contacts the roller 26 is connected to a rubber part, so that the roller 26 can avoid direct contact with the adjusting bolt 41, thereby reducing the damage to the roller 26.

[0037] Secondly, the low-position sensor 42 is set on the moving path of the electro-hydraulic actuator 21. When the electro-hydraulic actuator 21 pushes the limiting rack 31 to the farthest distance, the lifting platform 24 is in a low position. At this time, the limiting rack 31 will not block the light emitted by the low-position sensor 42. The low-position sensor 42 set on the opposite side of the frame 11 can receive the detection light emitted from the opposite side, and thus send a signal that the lifting platform 24 is in a low position. When the electro-hydraulic actuator 21 pulls the limiting rack 31 to block the light of the low-position sensor 42, the low-position sensor 42 will not send a low-position signal.

[0038] Secondly, a low-position limiting member 43 is fixedly connected to the top surface of the frame 11 by bolts. The top end face of the low-position limiting member 43 can restrict the lifting platform 24 from continuing to descend, thereby allowing the lifting platform 24 to reach the designated low position for the next production process. The distance between the end face of the low-position limiting member 43 and the top surface of the frame 11 can be adjusted by adjusting the bolt 41, thereby adjusting the low position height of the lifting platform 24.

[0039] Furthermore, the limiting component 4 also includes a high-position limit switch 44, which is fixedly connected to one end of the slide rail 12 relative to the rotating link 23. When the electro-hydraulic push rod 21 pulls the moving link 22 toward the rotating link 23, the high-position limit switch 44 moves toward the rotating link 23. When it contacts a protruding side on the frame 11, the lifting platform 24 rises to the highest position, thereby limiting the electro-hydraulic push rod 21 from continuing to pull the moving link 22. The position of the protrusion on the frame 11 is set according to the height of the lifting platform 24 required in the production process.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0041] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A lifting mechanism for an electro-hydraulic actuator (21), characterized in that, include: Mounting base (1), the top surface of which is a horizontal plane; as well as The lifting assembly (2) is disposed on the top surface of the mounting base (1). The lifting assembly (2) includes an electro-hydraulic actuator (21) and a scissor fork mechanism. The electro-hydraulic actuator (21) can rotate relative to the scissor fork mechanism and push the scissor fork mechanism to achieve vertical lifting movement.

2. The electro-hydraulic actuator (21) lifting mechanism according to claim 1, characterized in that: The mounting base (1) includes: Frame (11), the lifting assembly (2) is connected to the frame (11); and The slide rails (12) are arranged on opposite sides of the frame (11), and the opposite sides of the slide rails (12) form a groove (13). The length direction of the groove (13) is the same as the length direction of the slide rail (12), and the moving end of the lifting assembly (2) moves along the inner side of the groove (13).

3. The electro-hydraulic actuator (21) lifting mechanism according to claim 2, characterized in that: The fixed end of the electro-hydraulic actuator (21) is connected to the frame (11), and the movement direction of the moving end of the electro-hydraulic actuator (21) is the same as the length direction of the slide rail (12); The lifting assembly (2) also includes a rotating link (23) with one end connected to the frame (11), and the other end of the rotating link (23) connected to one side of the lifting platform (24). The top surface of the lifting platform (24) is a horizontal plane. The opposite side of the lifting platform (24) is connected to one end of a moving link (22). The other end of the moving link (22) is connected to the inner surface of the slide groove (13) through a roller (26). A transverse link (25) is connected between the moving link (22) on both sides of the frame (11) and the end connected to the slide groove (13). The moving end of the electro-hydraulic actuator (21) is connected to the transverse link (25). The length direction of the transverse link (25) is perpendicular to the movement direction of the electro-hydraulic actuator (21). The rotating link (23), the moving link (22), and the lifting platform (24) form the scissor fork mechanism.

4. The electro-hydraulic actuator (21) lifting mechanism according to claim 3, characterized in that: It also includes a fall arrestor assembly (3) disposed on one side of the frame (11) near the moving end of the electro-hydraulic actuator (21), the fall arrestor assembly (3) comprising: A limiting rack (31) with one end connected to the moving end of the electro-hydraulic actuator (21), the length direction of the limiting rack (31) being the same as the moving direction of the electro-hydraulic actuator (21), and a limiting groove (32) formed on one side of the limiting rack (31); and A limiting cylinder (33) is installed on the frame (11). The moving end of the limiting cylinder (33) is connected to a blocking block (35). The moving direction of the blocking block (35) is perpendicular to the length direction of the limiting rack (31). The limiting cylinder (33) pushes the limiting block to embed into the limiting groove (32) to fix the limiting rack (31).

5. The electro-hydraulic actuator (21) lifting mechanism according to claim 4, characterized in that: The fall arrestor assembly (3) also includes: A paddle (34) is disposed at the moving end of the limiting cylinder (33), the movement trajectory of which is the same as that of the limiting block; and The first limit switch (36) and the second limit switch (37) are provided on the frame (11). During the movement of the limit block toward the limit rack (31), when the limit block moves away from the limit rack (31), the paddle (34) contacts the first limit switch (36), and when the limit block moves closer to the limit rack (31), the paddle (34) contacts the second limit switch (37).

6. The electro-hydraulic actuator (21) lifting mechanism according to claim 5, characterized in that: It also includes a limiting component (4), which includes: An adjusting bolt (41) is connected to the slide rail (12) at one end. The side of the slide groove (13) and the end face of the adjusting bolt (41) form the stroke of the moving link (22). The adjusting bolt (41) can adjust the position relative to the slide rail (12). A low-position sensor (42) is disposed on the opposite side of the frame (11), and the limiting rack (31) can block or not block the detection light of the low-position sensor (42) during its movement; and A low-position limiting member (43) is provided on the top surface of the frame (11). The top of the low-position limiting member (43) can prevent the lifting platform (24) from moving further downward. The low-position limiting member (43) can adjust its position relative to the frame (11).

7. The electro-hydraulic actuator (21) lifting mechanism according to claim 6, characterized in that: The slide rail (12) has multiple through holes (14) formed on its side, which penetrate the slide groove (13).

8. The electro-hydraulic actuator (21) lifting mechanism according to claim 7, characterized in that: The limiting component (4) also includes a high-position limit switch (44), which is disposed at one end of the slide rail (12) relative to the rotating connecting rod (23) and is able to contact the side of the frame (11).

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