Grinding device for inner wall surface of shock absorber sleeve

Abstract

The invention relates to the technical field of shock absorber accessories, in particular to a shock absorber sleeve inner wall face grinding device which comprises a support, a driving motor, a transmission shaft and a grinding head, the middle of the transmission shaft comprises a worm section, a feeding mechanism comprises a rotating shaft, and a worm gear meshed with the worm section is fixed to the middle of the rotating shaft; the support is further rotationally connected with a second gear meshed with the first gear, the outer end face of the second gear is fixedly connected with a shifting rod, the support is connected with a movable block capable of moving up and down, the side face of the movable block extends in the direction of the first gear to form a bearing rod, and a sleeve fixing frame is connected to the upper portion of the movable block. The elastic piece is used for preventing the movable block from moving upwards; polishing duration distribution of different areas (deep positions and edges) in the sleeve is optimized, and it is ensured that the inner wall of the sleeve is fully and evenly polished; and meanwhile, the linkage device drives the polishing head to reciprocate up and down while rotating, so that the polishing quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorber accessories, and in particular to a shock absorber sleeve inner wall grinding device. Background Art

[0002] In the automobile manufacturing and maintenance industry, the shock absorber is one of the key components to ensure vehicle driving stability and passenger comfort. As an important part of the shock absorber, the surface quality of the inner wall of the shock absorber sleeve directly affects the working performance and service life of the shock absorber. Therefore, it is very necessary to finely grind the inner wall of the shock absorber sleeve. In the traditional sleeve grinding process, the inner wall of the sleeve is usually polished with hand-held tools or simple mechanical devices. In this case, the operator needs to constantly adjust the position of the tool to adapt to the grinding requirements of different depths, which makes it difficult to maintain constant pressure and speed during the grinding process, and easily causes local over-grinding or under-grinding. In addition, the deep inner wall of the sleeve often has a large number of tiny defects, burrs or uneven rough surfaces after casting or turning and milling, which requires more fine grinding for a period of time. The traditional process does not make a detailed allocation of the grinding time at different depths of the inner wall of the sleeve, which makes it easy for the inner wall of the sleeve to be not smooth enough, which will increase the friction between the piston and the sleeve, resulting in a decrease in the working efficiency of the shock absorber. Summary of the invention

[0003] 1. Technical issues to be solved

[0004] The purpose of the present invention is to provide a device for grinding the inner wall of a shock absorber sleeve, which optimizes the distribution of grinding time for different areas inside the sleeve and ensures that the inner wall of the sleeve is fully and evenly ground.

[0005] 2. Technical Solution

[0006] The present invention is achieved through the following technical solutions:

[0007] The cam is an axially coupled machine which is coupled to the drive shaft and is provided with a toothed connecting strip which is adapted to move the toothed connecting strip to the drive shaft.

[0008] According to an embodiment of the present invention, the movable block is provided with a slide groove in the vertical direction, the bracket is fixedly connected to a limiting slider, the limiting slider is slidably connected to the slide groove, the side of the movable block is connected to a fixed plate, the fixed plate is provided with a through hole, the bracket is fixedly connected to a guide rod, the guide rod passes through the through hole to the top of the fixed plate, and the end thereof is fixedly connected to an end head, the elastic member is a compression spring sleeved on the guide rod, and the two ends of the compression spring are respectively connected to the end head and the fixed plate.

[0009] According to an embodiment of the present invention, the sleeve fixing frame includes a vertical rod rotatably connected to the upper end of the movable block, two parallel horizontal rods fixed to the sides of the vertical rod, a curved plate fixed between the two horizontal rods, and an insertion rod; the curved plate is in contact with the outer wall of the sleeve, a lower plug hole is provided on the bracket, and an upper plug hole is provided on the horizontal rod located below, and the insertion rod can be inserted into the upper and lower plug holes to limit the sleeve fixing frame to only move up and down; wherein, the end of the horizontal rod protrudes and extends to the inner side of the curved plate, and the sleeve can be limited between the ends of the two horizontal rods and the curved plate.

[0010] According to an embodiment of the present invention, the transmission ratio between the first gear and the second gear is not less than 2.

[0011] According to an embodiment of the present invention, the transmission shaft includes a fixed shaft segment connected to the driving motor, and a movable shaft segment fixedly connected to the grinding head, the end face of the fixed shaft segment is provided with a connecting hole into which the movable shaft segment can be inserted, a limiting groove is provided on the inner wall of the connecting hole along its axial direction, a limiting ridge is provided on the surface of the movable shaft segment along its axial direction, and the limiting ridge is slidably connected to the limiting groove; and a linkage device is also included for driving the movable shaft segment to reciprocate up and down along the axial direction.

[0012] According to an embodiment of the present invention, the linkage device includes a connecting rod, a fork claw, and two parallel limit rings coaxially fixedly connected to the movable shaft; the connecting rod includes a rod body, and a circular ring connected to the lower end of the rod body, the end of the rotating shaft is eccentrically fixedly connected with a circular plate, the circular plate is rotatably connected in the circular ring, the upper end of the rod body is pinned to the side of the fork claw, the tail of the fork claw is rotatably connected to the bracket, the fork claw includes two fork-shaped ends, the fork-shaped ends extend between the two limit rings and abut against the surface of the limit ring to drive the movable shaft to move.

[0013] According to an embodiment of the present invention, the bracket includes a lower limit plate, which is used to limit the extreme position of the downward movement of the movable block, and the guide rod is fixed on the lower limit plate; wherein, when the shift rod moves to a horizontal position, the receiving rod is in contact with the surface of the shift rod, and the movable block is located at the lowest extreme position it can move.

[0014] 3. Beneficial Effects

[0015] One or more of the above embodiments have the following advantages or beneficial effects:

[0016] 1. A shock absorber sleeve inner wall grinding device according to an embodiment of the present invention utilizes a worm gear mechanism and a gear transmission system to enable the sleeve fixing frame to drive the sleeve to move slowly, thereby optimizing the grinding time distribution of different areas (deep and edge) inside the sleeve, and ensuring that the inner wall of the sleeve is fully and evenly ground; at the same time, the linkage device causes the grinding head to reciprocate up and down while rotating, thereby improving the grinding quality;

[0017] 2. The feeding mechanism enables the sleeve to be accurately moved toward or away from the grinding head as the lever moves, thereby controlling the depth of the grinding head inserted into the sleeve, which helps to perform fine processing on a specific area; after the entire grinding process is completed, the sleeve will automatically rise to the highest point and completely separate from the grinding head 4, facilitating subsequent material loading and unloading and material replacement operations;

[0018] 3. The grinding cycle is controlled by presetting a fixed motor start and stop time to ensure that each sleeve can obtain a consistent surface treatment effect under the same conditions, which is beneficial to product quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above contents and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 It is a three-dimensional structural schematic diagram of another viewing angle of the present invention;

[0022] Figure 3 yes Figure 1 Right perspective view of

[0023] Figure 4 yes Figure 2 A partial enlarged view of part A;

[0024] 1. Bracket; 11. Lower plug hole; 12. Lower limit plate; 2. Driving motor; 3. Transmission shaft; 31. Fixed shaft section; 311. Connecting hole; 312. Limiting groove; 32. Movable shaft section; 321. Limiting ridge; 33. Worm section; 4. Grinding head; 5. Feeding mechanism; 51. Rotating shaft; 52. Worm wheel; 53. First gear; 54. Second gear; 55. Push rod; 56. Movable block; 561. Receiver rod; 562. Slide groove; 57, sleeve fixing frame; 571, vertical rod; 572, horizontal rod; 5721, upper plug hole; 573, curved plate; 574, plug rod; 58, compression spring; 59, limit slider; 510, fixing plate; 5101, through hole; 511, guide rod; 512, end; 6, linkage device; 61, connecting rod; 611, rod body; 612, circular ring; 62, fork claw; 621, forked end; 63, limit ring; 64, circular plate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0026] It should be noted that in the drawings, the size and relative size of the elements may be exaggerated for the purpose of clarity and / or description. Thus, the size and relative size of each element are not necessarily limited to the size and relative size shown in the drawings. In the specification and drawings, the same or similar reference numerals indicate the same or similar parts.

[0027] When an element is described as being "on" another element, "connected to" another element or "coupled to" another element, the element may be directly on the other element, directly connected to the other element or directly coupled to the other element, or there may be an intermediate element. However, when an element is described as being "directly on" another element, "directly connected to" another element or "directly coupled to" another element, there is no intermediate element. Other terms and / or expressions used to describe the relationship between elements should be interpreted in a similar manner, for example, "between..." versus "directly between...", "adjacent" versus "directly adjacent" or "on..." versus "directly on...", etc. In addition, the term "connection" may refer to a physical connection, an electrical connection, a communication connection and / or a fluid connection. In addition, the X-axis, the Y-axis and the Z-axis are not limited to the three axes of a rectangular coordinate system, and may be interpreted in a broader sense. For example, the X-axis, the Y-axis and the Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purpose of the present invention, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z such as XYZ, XYY, YZ, and ZZ. As used herein, the term "and / or" includes any and all combinations of one or more of the listed associated items.

[0028] It should be noted that, although the terms "first", "second", etc. may be used herein to describe various parts, components, elements, regions, layers and / or parts, these parts, components, elements, regions, layers and / or parts should not be limited by these terms. Instead, these terms are used to distinguish one part, component, element, region, layer and / or part from another. Thus, for example, the first part, first member, first element, first region, first layer and / or first part discussed below may be referred to as the second part, second member, second element, second region, second layer and / or second part without departing from the teachings of the present invention.

[0029] The embodiment of the present invention provides a device for grinding the inner wall of a shock absorber sleeve, see Figure 1-4 , including a bracket 1, on which a driving motor 2 is fixed, an output end of the driving motor 2 is coaxially connected to a transmission shaft 3, an end of the transmission shaft 3 is fixedly connected to a grinding head 4, the driving motor 2 outputs power, and the grinding head 4 is used to grind the inner wall of the sleeve.

[0030] The middle part of the transmission shaft 3 includes a worm section 33. The present invention also provides a feeding mechanism 5 for fixing the position of the sleeve and automatically separating the sleeve from the grinding head 4 after the sleeve grinding is completed.

[0031] Specifically, the feeding mechanism 5 includes a rotating shaft 51 rotatably connected to the bracket 1, a worm wheel 52 meshing with the worm segment 33 is fixed in the middle of the rotating shaft 51, and a first gear 53 is fixedly connected at one end. A second gear 54 meshing with the first gear 53 is also rotatably connected to the bracket 1, and a lever 55 is fixedly connected to the outer end surface of the second gear 54. A movable block 56 that can move up and down is connected to the bracket 1, and a receiving rod 561 extends from the side of the movable block 56 toward the first gear 53. A sleeve fixing frame 57 is connected above the movable block 56, and the sleeve fixing frame 57 is used to fix and position the sleeve.

[0032] The movable block 56 is provided with a slide groove 562 in the vertical direction, and a limiting slider 59 is fixedly connected to the bracket 1, and the limiting slider 59 is slidably connected to the slide groove 562. The present invention also includes an elastic member for preventing the movable block 56 from moving upward. As an embodiment of the present invention, a fixed plate 510 is connected to the side of the movable block 56, and a through hole 5101 is provided on the fixed plate 510. A guide rod 511 is fixedly connected to the bracket 1, and the guide rod 511 passes through the through hole 5101 to the top of the fixed plate 510, and its end is fixedly connected to the end 512. The elastic member is a compression spring 58 sleeved on the guide rod 511, and the two ends of the compression spring 58 are respectively connected to the end 512 and the fixed plate 510. The compression spring 58 is used to move the sleeve fixing frame 57 downward for resetting and grinding.

[0033] The bracket 1 includes a lower limit plate 12, which is used to limit the downward movement of the movable block 56. The guide rod 511 is fixed on the lower limit plate 12; wherein, when the lever 55 moves to a horizontal position, the receiving rod 561 is attached to the surface of the lever 55, and the movable block 56 is located at the lowest limit position it can move, that is, at this time, the lower end of the movable block 56 contacts the lower limit plate 12.

[0034] During operation, the driving motor 2 drives the transmission shaft 3 to rotate, the transmission shaft 3 drives the worm to rotate, the worm drives the worm wheel 52 to rotate, the worm wheel 52 drives the rotating shaft 51 to rotate, the rotating shaft 51 drives the first gear 53 to rotate, the first gear 53 drives the second gear 54 to rotate, and the lever 55 rotates with the second gear 54; during the sleeve grinding process, the lever 55 is initially in a vertical position, the receiving rod 561 is lifted to the highest position by the lever 55, and as the second gear 54 rotates, the end of the lever 55 gradually drops, and under the downward pressure of the compression spring 58, the movable block 56 moves downward as a whole, and the sleeve is driven by the sleeve fixing frame 57 to gradually approach the grinding head 4 until the grinding head 4 is fully inserted into the sleeve for grinding. In this process, the shallower edge of the sleeve is mainly ground. As the second gear 54 continues to rotate, the lever 55 rotates to a horizontal position, and the lower end of the movable block 56 contacts the lower limit plate 12 to the lowest position it can move; when the lever 55 continues to rotate during half a circle of the second gear 54, the grinding head 4 is fully extended into the sleeve to grind the deep inner wall of the sleeve; when the lever 55 continues to rotate to the horizontal position on the other side, when the lever 55 rotates to the bottom of the receiving rod 561, the lever 55 pushes the receiving rod 561 from below, and the receiving rod 561 drives the movable block 56 to move upward as a whole, so that the sleeve fixing frame 57 moves upward along the axial direction of the transmission shaft 3 just above the grinding head 4. In this process, the sleeve gradually separates from the grinding head 4, and the grinding head 4 mainly grinds the shallower edge of the sleeve. Therefore, the sleeve is installed on the sleeve fixing frame 57, and can be driven by the driving motor 2 and the grinding head 4 rotates, while the grinding head 4 is gradually inserted into the sleeve for grinding; when the grinding head 4 penetrates to the predetermined position (deep inside the sleeve), the deep inner wall of the sleeve is finely ground and maintained for a certain time to ensure the surface quality; then, the sleeve is automatically separated from the grinding head 4, thereby optimizing the distribution of grinding time for different areas inside the sleeve (including deep areas and edges), and significantly improving the overall grinding effect and operating efficiency; after completing the entire grinding process, the sleeve will automatically rise to the highest point and completely separate from the grinding head 4, which is convenient for subsequent material loading and unloading and material changing operations.

[0035] In addition, according to an embodiment of the present invention, the sleeve fixing frame 57 includes a vertical rod 571 rotatably connected to the upper end of the movable block 56, two parallel horizontal rods 572 fixed to the side of the vertical rod 571, a curved panel 573 fixed between the two horizontal rods 572, and an insertion rod 574; the curved panel 573 is in contact with the outer wall of the sleeve, a lower insertion hole 11 is provided on the bracket 1, and an upper insertion hole 5721 is provided on the horizontal rod 572 located below, and the insertion rod 574 can be inserted into the upper insertion hole 5721 and the lower insertion hole 11 to limit the sleeve fixing frame 57 to only move up and down; wherein, the end of the horizontal rod 572 protrudes and extends to the inner side of the curved panel 573, and the sleeve can be limited between the ends of the two horizontal rods 572 and the curved panel 573. A handle is also provided at the upper end of the vertical rod 571. When the sleeve fixing frame 57 is at the highest position, the sleeve fixing frame 57 is rotated to one side to facilitate replacement of the sleeve for grinding. After replacing the new workpiece to be grinded, the sleeve fixing frame 57 is rotated again to above the grinding head 4, and the insertion rod 574 is inserted into the upper insertion hole 5721 and the lower insertion hole 11 to maintain the stability of the sleeve fixing frame 57.

[0036] The transmission ratio of the first gear 53 to the second gear 54 is not less than 2. During the grinding process, the second gear 54 rotates slowly, and the sleeve fixing frame 57 drives the sleeve to move slowly, so that the inner wall of the sleeve can be fully ground.

[0037] In one embodiment of the present invention, the transmission shaft 3 includes a fixed shaft section 31 and a movable shaft section 32, and the worm section 33 is arranged in the middle part of the fixed shaft section 31, wherein the fixed shaft section 31 is connected to the output end of the driving motor 2, and the movable shaft section 32 is fixedly connected to the grinding head 4, and a connecting hole 311 is provided on the end face of the fixed shaft section 31 to allow the movable shaft section 32 to be inserted; a limiting groove 312 is provided on the inner wall of the connecting hole 311 along its axial direction, and a limiting ridge 321 is provided on the surface of the movable shaft section 32 along its axial direction, and the limiting ridge 321 is slidably connected with the limiting groove 312, and the movable shaft section 32 has the freedom to move axially under the restriction of the cooperation between the limiting ridge 321 and the limiting groove 312, and a linkage device 6 is also provided in the present invention, and the linkage device 6 is connected to the movable shaft section 32 to drive the movable shaft section 32 to move reciprocatingly up and down along the axial direction, so that the grinding head 4 can rotate in the sleeve to grind the inner wall while moving up and down, so that the inner wall of the sleeve is polished more evenly and smoothly.

[0038] The linkage device 6 includes a connecting rod 61, a fork claw 62, and two parallel limit rings 63 coaxially fixedly connected to the movable shaft; the tail of the fork claw 62 is rotatably connected to the bracket 1, and the fork claw 62 includes two forked ends 621, and the forked ends 621 extend between the two limit rings 63; the connecting rod 61 includes a rod body 611, and a ring 612 connected to the lower end of the rod body 611, the upper end of the rod body 611 is pin-connected to the side of the fork claw 62, and the end of the rotating shaft 51 is eccentrically fixedly connected with a circular plate 64, and the circular plate 64 is rotatably connected in the circular ring 612; The driving motor 2 drives the fixed shaft section 31 to rotate, and the worm section 33 rotates synchronously. The worm section 33 drives the worm wheel 52 to rotate, and the worm wheel 52 drives the rotating shaft 51 to rotate. The rotating shaft 51 drives the circular plate 64 to rotate. The circular plate 64 rotates eccentrically in the circular ring 612 so that the upper end of the circular ring 612 drives the fork-shaped end 621 to swing back and forth up and down. The fork-shaped end 621 abuts against the surface of the limit ring 63 and drives the movable shaft section 32 to move back and forth up and down, thereby achieving up and down reciprocating movement while the grinding head 4 rotates, forming a more delicate and smooth surface treatment effect inside the sleeve.

[0039] In the present invention, the sleeve fixing frame 57 moves to control the depth of the grinding head 4 inserted into the sleeve, the rotation of the grinding head 4, and the reciprocating up and down movement of the grinding head 4 are carried out synchronously; the combined movement of the grinding head 4 and the sleeve fixing frame 57 can ensure that each area of ​​the sleeve in the axial direction of its inner wall can be polished, and the polishing process of each area is uniformly and properly processed through the reciprocating movement of the grinding head 4. Different sleeve fixing frames 57 and grinding heads 4 can be replaced according to design requirements, so as to be suitable for sleeve processing tasks of various types and sizes; in addition, the integrated design is conducive to improving the synchronization of the system, and the grinding cycle can be controlled by presetting a fixed motor start and stop time, ensuring that each sleeve can obtain a good surface treatment effect within the preset time.

[0040] It should be understood that the cutting device according to the embodiment of the present invention has all the characteristics and advantages of the above-mentioned alignment mechanism. For details, please refer to the above description, which will not be repeated here.

[0041] It will be appreciated by those skilled in the art that the features described in the various embodiments of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, without departing from the spirit and teachings of the present invention, the features described in the various embodiments of the present invention may be combined and / or combined in various ways. All of these combinations and / or combinations fall within the scope of the present invention.

[0042] The embodiments of the present invention are described above. However, these embodiments are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Although each embodiment is described above, it does not mean that the measures in each embodiment cannot be used in combination advantageously. Without departing from the scope of the present invention, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A device for grinding the inner wall of a shock absorber sleeve, comprising a bracket, a driving motor fixed on the bracket, a transmission shaft coaxially connected to the output end of the driving motor, and a grinding head fixedly connected to the end of the transmission shaft, characterized in that: The transmission shaft includes a worm section in the middle portion and a feeding mechanism, the feeding mechanism includes a rotating shaft rotatably connected to the bracket, a worm wheel meshing with the worm section is fixed to the middle portion of the rotating shaft, and a first gear is fixedly connected to one end; a second gear meshing with the first gear is also rotatably connected to the bracket, a shift rod is fixedly connected to the outer end surface of the second gear, a movable block capable of moving up and down is connected to the bracket, a receiving rod extends from the side of the movable block in the direction of the first gear, a sleeve fixing frame is connected above the movable block, and also includes an elastic member for preventing the movable block from moving upward; wherein, the shift rod can push the receiving rod from below to enable the sleeve fixing frame to move axially along the transmission shaft just above the grinding head.

2. A shock absorber sleeve inner wall grinding device according to claim 1, characterized in that: The movable block is provided with a slide groove along the vertical direction, the bracket is fixedly connected to a limit slider, the limit slider is slidably connected to the slide groove, the side of the movable block is connected to a fixed plate, the fixed plate is provided with a through hole, the bracket is fixedly connected to a guide rod, the guide rod passes through the through hole to the top of the fixed plate, and the end thereof is fixedly connected to an end head, the elastic member is a compression spring sleeved on the guide rod, and the two ends of the compression spring are respectively connected to the end head and the fixed plate.

3. A shock absorber sleeve inner wall grinding device according to claim 2, characterized in that: The sleeve fixing frame includes a vertical rod rotatably connected to the upper end of the movable block, two parallel horizontal rods fixed to the sides of the vertical rod, a curved plate fixed between the two horizontal rods, and an insertion rod; the curved plate is in contact with the outer wall of the sleeve, a lower insertion hole is provided on the bracket, and an upper insertion hole is provided on the horizontal rod located below, and the insertion rod can be inserted into the upper insertion hole and the lower insertion hole to limit the sleeve fixing frame to only move up and down; wherein, the end of the horizontal rod protrudes and extends to the inner side of the curved plate, and the sleeve can be limited between the ends of the two horizontal rods and the curved plate.

4. A shock absorber sleeve inner wall grinding device according to claim 1, characterized in that: The transmission ratio between the first gear and the second gear is not less than 2.

5. A shock absorber sleeve inner wall grinding device according to any one of claims 1 to 4, characterized in that: The transmission shaft includes a fixed shaft section connected to the driving motor and a movable shaft section fixedly connected to the grinding head. The end face of the fixed shaft section is provided with a connecting hole into which the movable shaft section can be inserted. A limiting groove is provided on the inner wall of the connecting hole along its axial direction. A limiting ridge is provided on the surface of the movable shaft section along its axial direction. The limiting ridge is slidably connected to the limiting groove. The transmission shaft also includes a linkage device for driving the movable shaft section to reciprocate up and down along the axial direction.

6. A shock absorber sleeve inner wall grinding device according to claim 5, characterized in that: The linkage device includes a connecting rod, a fork claw, and two parallel limit rings coaxially fixedly connected to the movable shaft; the connecting rod includes a rod body and a circular ring connected to the lower end of the rod body, the end of the rotating shaft is eccentrically fixedly connected with a circular plate, the circular plate is rotatably connected in the circular ring, the upper end of the rod body is pinned to the side of the fork claw, the tail of the fork claw is rotatably connected to the bracket, the fork claw includes two fork-shaped ends, the fork-shaped ends extend between the two limit rings and abut against the surface of the limit ring to drive the movable shaft to move.

7. A shock absorber sleeve inner wall grinding device according to claim 2, characterized in that: The bracket includes a lower limit plate, which is used to limit the limit position of the movable block moving downward, and the guide rod is fixed on the lower limit plate; wherein, when the lever moves to a horizontal position, the receiving rod is attached to the surface of the lever, and the movable block is located at the lowest limit position it can move.

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