A stroke adjustment mechanism

Abstract

The application discloses a stroke adjusting mechanism, which comprises a fixed layer module, an execution layer module, a locking mechanism, a power mechanism and an adjusting layer module; the adjusting layer module is arranged between the fixed layer module and the execution layer module in an up-down mode; the locking mechanism is arranged on one side of the adjusting layer module; and the power mechanism is arranged on the other side of the adjusting layer module; the power mechanism is movably arranged along a first preset direction and is used for driving the adjusting layer module to move so as to drive the execution layer module to be arranged relatively close to or away from the fixed layer module along a second preset direction. Compared with the traditional fine stroke adjusting mechanism on the market, the stroke adjusting mechanism has the advantages of high precision, large bearing capacity and low cost.

Description

Technical Field

[0001] This invention relates to a stroke adjustment mechanism, belonging to the field of lifting platforms. Background Technology

[0002] In optical systems, fine-tuning lifting mechanisms are a common component. Currently, the main operational methods of high-precision, short-stroke optical lifting stages on the market are as follows:

[0003] Screw drive: This typically includes a servo motor, a screw, and a guide rail. A precise screw drive system enables the lifting and lowering of the platform. This method offers advantages such as high precision, high rigidity, and high stability, but also has disadvantages such as limited load-bearing capacity and high requirements for power supply and control systems.

[0004] Chain drive: typically includes a servo motor, chain, and guide rail. While these methods offer advantages such as precision and high efficiency in lifting and adjusting, they also suffer from larger structural dimensions, poor stability, and for lifting mechanisms with short strokes, issues such as insufficient accuracy, limited load-bearing capacity, and high requirements for power supply and control systems remain.

[0005] Hydraulic transmission: The lifting platform is raised and lowered through a hydraulic system. This method has the advantages of high load-bearing capacity, high rigidity, and high stability, but it also has the disadvantages of high requirements for the hydraulic system and high maintenance costs.

[0006] Pneumatic transmission: The lifting platform is raised and lowered using a pneumatic system. This method has the advantages of high speed, fast response, and low maintenance cost, but it also has the disadvantages of low precision and poor stability.

[0007] Electric drive: The lifting platform is raised and lowered by a motor. This method has the advantages of high precision, high stability, and low cost, but it also has the disadvantages of high power requirements and the need for precise control of the control system.

[0008] Therefore, it is necessary to study and improve a new type of precision adjustment mechanism to address the shortcomings of existing technologies and provide reference and guidance for practice. Summary of the Invention

[0009] This invention provides a stroke adjustment mechanism that, by adjusting the input power of the screw, transforms the motion along a first preset direction into motion in a second preset direction, thereby achieving fine-tuning of the stroke in the second preset direction.

[0010] The technical solution of this invention is:

[0011] A stroke adjustment mechanism includes a fixed layer module 1, an execution layer module 2, a locking mechanism 4, a power mechanism 5, and an adjustment layer module 6. The adjustment layer module 6 is installed between the fixed layer module 1 and the execution layer module 2, which are arranged vertically. The locking mechanism 4 is installed on one side of the adjustment layer module 6, and the power mechanism 5 is installed on the other side of the adjustment layer module 6. The power mechanism 5 is movably arranged along a first preset direction to drive the adjustment layer module 6 to move so that the execution layer module 2 is arranged relatively closer to or further away from the fixed layer module 1 in a second preset direction.

[0012] The fixed layer module 1 includes a lower base 8, a roller retainer I9 mounted on the lower base 8, and rollers I10 embedded in the roller retainer I9. The rollers I10 are used to support the movement of the adjustment layer module 6. The adjustment layer module 6 includes a roller retainer II22 mounted on the lower base 8 and rollers II23 embedded in the roller retainer II22. The upper and lower extension plates of the roller retainer II22 are used to limit the movement of rollers I10 and III13, respectively. The execution layer module 2 includes an upper base 11, a roller retainer III12, and rollers III13. The rollers III13 are embedded in the roller retainer III12. The roller retainer III12 is mounted on the lower part of the upper base 11 and is arranged vertically parallel to the roller retainer I9 based on the adjustment layer module 6.

[0013] The rollers I10, II23, and III13 are tangentially fitted by surface line contact, and the distance d between the center of roller I10 and the center of roller II23, and between the center of roller II23 and the center of roller III13 are equal.

[0014] The adjustment layer module 6 also includes a front baffle 29 and a rear baffle 30 of roller II installed on the lower base 8; the front baffle 29 and the rear baffle 30 of roller II are arranged in parallel on opposite sides of roller cage II22 based on roller cage II22, thereby limiting the roller II23 in roller cage II22.

[0015] The stroke adjustment mechanism further includes a housing portion 3 surrounding the outer periphery of the adjustment layer module 6, and the housing portion 3 is fixed to the fixed layer module 1; the power mechanism 5 includes an adjustment screw 19 and a power connecting block 20; wherein, the adjustment screw 19 is threadedly engaged with one side of the housing portion 3 to transmit force to the power connecting block 20 at the end of the adjustment screw 19, so that the power connecting block 20 is movably arranged along a first preset direction; the power connecting block 20 engages with an open slot at one end of the roller retainer II 22 in the adjustment layer module 6 to realize the position change of the adjustment layer module 6 in the first preset direction and the second preset direction; wherein, the opening of the open slot faces the execution layer module 2.

[0016] The power connection block 20 includes a connecting part, a first snap-fit ​​part, and a second snap-fit ​​part. One end of the connecting part is connected to the first snap-fit ​​part, and the other end of the connecting part is connected to the second snap-fit ​​part. The connecting part is inserted into an opening groove to engage the snap-fit ​​member composed of the first snap-fit ​​part and the second snap-fit ​​part with the roller cage II22.

[0017] The stroke adjustment mechanism also includes a guide mechanism 7 disposed on the fixed layer module 1, which is used to guide the movement of the execution layer module 2.

[0018] The guiding mechanism 7 includes a guide post 24, a guide sleeve 25, and a guide post support 26; one end of the guide post 24 is in clearance fit with the guide sleeve 25 installed at the lower part of the execution layer module 2, and the other end of the guide post 24 passes through the guide post support 26 and is fixed to the fixing layer module 1.

[0019] The guide mechanism 7 also includes a fisheye screw 27 and a tension spring 28; one end of the tension spring 28 is connected to the fisheye screw 27 fixed at the lower part of the execution layer module 2, and the other end of the tension spring 28 is connected to the fisheye screw 27 fixed at the upper part of the fixing layer module 1, so that the tension spring 28 is always in a stretched state.

[0020] The beneficial effects of this invention are:

[0021] 1. The invention cleverly designs the form of roller contact to make the fine-tuning stroke mechanism more precise. First, the invention drives the power connecting block to move along the first direction through the power mechanism, thereby causing the rollers in the adjustment layer to roll along the surface of the rollers in the fixed layer, thereby causing the rollers in the execution layer to drive the upper base to move up and down. The invention has a compact structure, runs more smoothly, and therefore has high precision, making it suitable for lifting with small strokes.

[0022] 2. Compared with existing fine-tuning travel mechanism solutions on the market, this invention adopts a modular design approach, decomposing the mechanism into different modules such as a fixed layer module, an adjustment layer module, and an execution layer module. Each module has its own function and specifications, making the design and manufacturing of this fine-tuning travel mechanism simpler and more flexible, and improving the quality and reliability of the mechanism. At the same time, the modular design also improves the interchangeability of mechanism components, reduces the difficulty of replacing parts, and significantly reduces the manufacturing cost of the precision fine-tuning travel mechanism.

[0023] 3. This invention, based on the rolling friction transmission principle of rollers, achieves a large contact area, allowing for better load distribution and improved load-bearing capacity. Furthermore, the large contact area of ​​the line contact friction between the rollers generates greater frictional force, which is beneficial for improving transmission stability and efficiency. Simultaneously, the relatively smooth contact surface of the line contact friction results in less wear, thus exhibiting good wear resistance, longer service life, and stronger adaptability and reliability.

[0024] In summary, compared with traditional fine-tuning stroke mechanisms on the market, this invention not only realizes the power output of the power mechanism to the adjustment layer, thereby driving the precise up and down movement of the execution layer, but also highlights the advantages of high precision, large load capacity, and low cost. Attached Figure Description

[0025] Figure 1 This is an isometric view of the overall appearance of the invention;

[0026] Figure 2 This is an isometric view of the interior of the mechanism of the present invention;

[0027] Figure 3 This is a front view of the invention's mechanism without its outer casing;

[0028] Figure 4 This is an isometric view of the fixed layer module of the present invention;

[0029] Figure 5 This is a front view of the execution layer module of the present invention;

[0030] Figure 6 This is a top view of the execution layer module of the present invention;

[0031] Figure 7 This is an isometric view of the outer casing portion of the present invention;

[0032] Figure 8 This is a front view of the locking mechanism of the present invention;

[0033] Figure 9 This is a front view of the power mechanism of the present invention;

[0034] Figure 10 This is an isometric exploded view of the power mechanism of the present invention;

[0035] Figure 11 This is an isometric view of the adjustment layer module of the present invention;

[0036] Figure 12 This is an isometric exploded view of the adjustment layer module of the present invention;

[0037] Figure 13 This is an isometric view of the guiding portion of the present invention;

[0038] Figure 14 This is an isometric exploded view of the guiding portion of the present invention;

[0039] Figure 15 This is an isometric view of the tension spring portion of the present invention;

[0040] Figure 16 This is an isometric view of the roller II baffle of the present invention;

[0041] Figure 17 This is an isometric view of the power connection block of the present invention;

[0042] Figure 18 The roller layout is shown from the rear view. Figure 1 ;

[0043] Figure 19 The roller layout is shown from the rear view. Figure 2 ;

[0044] The labels in the diagram are as follows: 1-Fixed layer module, 2-Execution layer module, 3-Outer shell, 4-Locking mechanism, 5-Power mechanism, 6-Adjusting layer module, 7-Guide part, 8-Lower base, 9-Roller cage I, 10-Roller I, 11-Upper base, 12-Roller cage III, 13-Roller III, 14-Left baffle, 15-Right baffle, 16-Front shell, 17-Rear shell, 18-Locking nut, 19-Adjusting screw, 20-Power connection block, 21-Snap ring, 22-Roller cage II, 23-Roller II, 24-Guide post, 25-Guide sleeve, 26-Guide post support, 27-Fisheye screw, 28-Tension spring, 29-Roller II front baffle, 30-Roller II rear baffle. Detailed Implementation

[0045] The invention will be further described below with reference to the accompanying drawings and embodiments, but the scope of the invention is not limited to the description.

[0046] Example 1: As Figure 1-19As shown, a stroke adjustment mechanism includes a fixed layer module 1, an execution layer module 2, a locking mechanism 4, a power mechanism 5, and an adjustment layer module 6. The adjustment layer module 6 is installed between the fixed layer module 1 and the execution layer module 2, which are arranged vertically. The locking mechanism 4 is installed on one side of the adjustment layer module 6, and the power mechanism 5 is installed on the other side of the adjustment layer module 6. The power mechanism 5 is movably arranged along a first preset direction to drive the adjustment layer module 6 to move so that the execution layer module 2 is arranged relatively closer to or further away from the fixed layer module 1 in a second preset direction.

[0047] Further, the fixed layer module 1 includes a lower base 8, a roller retainer I9 mounted on the lower base 8, and rollers I10 embedded in the roller retainer I9. The rollers I10 are used to support the movement of the adjustment layer module 6. The adjustment layer module 6 includes a roller retainer II22 mounted on the lower base 8 and rollers II23 embedded in the roller retainer II22. The upper and lower extension plates of the roller retainer II22 are used to limit the movement of rollers I10 and III13, respectively. The execution layer module 2 includes an upper base 11, a roller retainer III12, and rollers III13. The rollers III13 are embedded in the roller retainer III12. The roller retainer III12 is mounted on the lower part of the upper base 11 and is arranged vertically parallel to the roller retainer I9 based on the adjustment layer module 6.

[0048] Furthermore, the rollers I10, II23, and III13 are of the same size and are tangentially fitted by surface line contact. The distance d between the center of roller I10 and the center of roller II23, and the distance d between the center of roller II23 and the center of roller III13 are equal.

[0049] Furthermore, the distance between the center of roller I10 and the center of roller III13 is h; distance Where n is the number of roller layers, D represents the diameter of the roller, and θ represents the angle between the line connecting the center of roller I10 and the center of roller II23, and the line connecting the center of roller II23 and the center of roller III13.

[0050] Furthermore, the adjustment layer module 6 also includes a front baffle 29 and a rear baffle 30 of roller II mounted on the lower base 8; the front baffle 29 and the rear baffle 30 of roller II are arranged in parallel on opposite sides of roller cage II22 based on roller cage II22, thereby limiting the roller II23 in roller cage II22.

[0051] Furthermore, it also includes a housing portion 3 surrounding the outer periphery of the adjustment layer module 6, and the housing portion 3 is fixed to the fixed layer module 1; the power mechanism 5 includes an adjusting screw 19 and a power connecting block 20; wherein, the adjusting screw 19 is threadedly engaged with one side of the housing portion 3 to transmit force to the power connecting block 20 at the end of the adjusting screw 19, so that the power connecting block 20 is movably arranged along a first preset direction; the power connecting block 20 engages with an open slot at one end of the roller retainer II 22 in the adjustment layer module 6 to realize the position change of the adjustment layer module 6 in the first preset direction and the second preset direction; wherein, the opening of the open slot faces the execution layer module 2.

[0052] Furthermore, the power connection block 20 includes a connecting part, a first snap-fit ​​part, and a second snap-fit ​​part. One end of the connecting part is connected to the first snap-fit ​​part, and the other end of the connecting part is connected to the second snap-fit ​​part. The connecting part is inserted into an opening groove to engage the snap-fit ​​member composed of the first snap-fit ​​part and the second snap-fit ​​part with the roller cage II22.

[0053] Furthermore, it also includes a guide mechanism 7 disposed on the fixed layer module 1 for guiding the movement of the execution layer module 2.

[0054] Furthermore, the guiding mechanism part 7 includes a guide post 24, a guide sleeve 25, and a guide post support 26; one end of the guide post 24 is in clearance fit with the guide sleeve 25 installed at the lower part of the execution layer module 2, and the other end of the guide post 24 passes through the guide post support 26 and is tightened to the fixing layer module 1 by a nut.

[0055] Furthermore, the guide mechanism 7 also includes a fisheye screw 27 and a tension spring 28; one end of the tension spring 28 is connected to the fisheye screw 27 fixed at the lower part of the execution layer module 2, and the other end of the tension spring 28 is connected to the fisheye screw 27 fixed at the upper part of the fixing layer module 1, so that the tension spring 28 is always in a stretched state.

[0056] The following detailed description, with reference to the accompanying drawings, describes optional specific embodiments of the present invention:

[0057] A precision stroke adjustment mechanism includes a fixed layer module 1, an execution layer module 2, a housing part 3, a locking mechanism 4, a power mechanism 5, an adjustment layer module 6, and a guide mechanism part 7, which has the advantages of high precision, large load capacity, and low cost.

[0058] like Figure 1 As shown, during installation, the outer shell 3 is fixed to the lower base 8 of the fixing layer module 1 by welding.

[0059] like Figure 2 , 3As shown in Figure 4, the fixed layer module 1 includes a lower base 8, a roller retainer I9, and rollers I10. The rollers I10 and the roller retainer I9 are in clearance fit, and the two ends of the rollers I10 are blocked by the lower extension plate of the roller retainer II22 in the adjustment layer module 6 to prevent them from axially moving during the movement.

[0060] like Figure 5 , 6 As shown, the execution layer module 2 includes an upper base 11, a roller retainer III12, and rollers III13. Rollers III13 and roller retainer III12 are in clearance fit, and both ends of rollers III13 are blocked by the extension plates on roller retainer II22 in the adjustment layer module 6 to prevent them from axially moving during the movement.

[0061] like Figure 7 , 8 As shown in Figures 9 and 10, the outer shell 3 includes a left baffle 14, a right baffle 15, a front shell 16, and a rear shell 17, which are welded and fixed to the lower base 8 of the fixed layer module 1. The left baffle 14 and the right baffle 15, which are placed in parallel, each have a threaded hole for connecting the locking mechanism 4 and the power mechanism 5, respectively. At the same time, the left baffle 14 and the right baffle 15 limit the adjustment layer module 6 to ensure that the entire mechanism can perform precise lifting and lowering movements. The locking nut 18 in the locking mechanism 4 is threadedly connected to the left baffle 14, and the head of the locking nut 18 is... The surface is knurled and has a cross-shaped notch, facilitating locking of the adjustment layer module 6 at different positions. The power mechanism 5 includes an adjusting screw 19, a power connecting block 20, and a retaining ring 21. The adjusting screw 19 is threaded to the right baffle 15, has knurled edges at its head, and its optical axis on the other side is interference-fitted with the power connecting block 20. Retaining rings 21 on both sides provide axial positioning. The power connecting block 20 engages with an open slot at one end of the roller retainer II 22. The power connecting block 20 moves along... Figure 2 From a visual perspective, the left-right movement can be achieved by the roller cage II22 driving the roller II23 to roll along the surfaces of roller I10 and roller III13.

[0062] like Figure 11 , 12As shown, the adjustment layer module 6 includes a roller cage II22, a roller II23, a roller II baffle 29, and a roller II rear baffle 30; wherein, the roller II23 is clearance-fitted with the roller cage II22; the roller II baffle 29 contacts the roller II cage 22 and is threadedly fixed to the lower base to prevent the roller II23 from axially moving during the movement (i.e., the two end faces of the roller II23 are respectively in contact with the end faces of the roller II baffle 29 and the roller II rear baffle 30); the opening groove on one side of the roller cage II22 is fitted with the power connection block 20.

[0063] like Figure 13 , 14 As shown in Figures 15 and 16, the guide portion 7 includes a guide post 24, a guide sleeve 25, and a guide post support 26. The guide post 24 has a threaded hole at its lower end and is connected to the guide post support 26 by an interference fit. It is fixed to the lower base by a thread, which further enhances its stability. The guide sleeve 25 is connected to the guide post support 26 by a clearance fit to ensure reliable guidance and stability. At the same time, both the guide sleeve 25 and the guide post support 26 have through holes, and both the upper base 11 and the lower base 8 have corresponding threads (i.e., the guide post support 26 is positioned and installed on the upper part of the lower base 8 according to the hole on the lower base 8 in the fixing layer module 1, and the guide sleeve 25 is positioned and installed on the lower part of the upper base 11 according to the hole on the upper base 11 in the execution layer module 2, with an M3×6 screw passing through it and threaded fastening at the end with the threaded hole).

[0064] like Figure 15 , 16 As shown, the guide part 7 also includes a fisheye screw 27 and a tension spring 28; the two symmetrical fisheye screws 27 are connected to the upper base 11 and the lower base 8 respectively by threaded fasteners and are located on both sides of the adjustment layer module 6. The upper fisheye screw 27 is connected to one end of the tension spring 28, and the lower fisheye screw 27 is connected to the other end of the tension spring 28, so that the tension spring 28 is always in a state of tension and elasticity. When the execution layer module 2 is at the highest point of the stroke, the tension of the tension spring 28 reaches the maximum and the elasticity reaches the maximum. When the execution layer module 2 is at the lowest point of the stroke, the tension of the tension spring 28 is the minimum and the elasticity is the minimum. This helps to achieve rapid and precise up and down displacement between the guide sleeve 25 and the execution layer module 2.

[0065] The power transmission process of this invention is as follows:

[0066] The power of the power mechanism 5 is first transmitted to the adjusting screw 19, and then transmitted to the power connector 20 through a threaded connection, which converts the rotational power of the adjusting screw 19 into the horizontal movement of the power connector 20, thereby realizing the distribution of power and the adjustment of speed.

[0067] The locking parts on both sides of the power connection block 20 cooperate with the roller cage II 22. Since the power connection block 20 moves horizontally in the axial direction, the locking parts of the power connection block 20 can transmit its power to the roller cage II 22, driving the roller II 23 to roll along the surface of the roller I 10 and the roller III 13. The rotation of the roller I 10, the roller II 23 and the roller III 13 enables the entire execution layer module 2 to perform precise lifting and lowering movements along the guide post 24.

[0068] During the lifting process, roller II23 also plays a role in supporting and transmitting the load. Through the rolling contact of roller II23, the load can be smoothly transmitted to the fixed layer module 1 and the execution layer module 2 of the fine-tuning stroke mechanism, thereby achieving stable and precise lifting motion.

[0069] As can be seen from the above technical solution, the stroke adjustment mechanism provided by the present invention has the following advantages: First, compared with the fine-tuning stroke mechanisms on the market, the present invention adopts the idea of ​​modular design, decomposing the mechanism into different functional modules, which directly reduces the robot manufacturing cost and improves resource utilization; Second, compared with the traditional servo motor + lead screw transmission method, since rollers are used as transmission elements, this mechanism can achieve high-precision position adjustment and meet the needs of precision positioning; The rolling contact of rollers has less friction and wear than sliding contact, thus ensuring long-term stable fine-tuning performance; The roller structure can withstand large loads and maintain good fine-tuning characteristics when the load changes; Due to the low friction and wear of the roller mechanism, its service life is relatively long and the maintenance cost is low.

[0070] The working principle of this invention is explained below with reference to Table 1, which shows the roller layout from a rear view:

[0071] like Figure 1-3 As shown, the entire fine-tuning stroke mechanism is fixed to the worktable through the four elongated holes of the lower base 8, and the upper base 11 of the execution layer module is fixed to the controlled device through four M4 threaded holes.

[0072] During upward motion, such as Figure 18 As shown, when the adjustment layer module 6 is in the lowest limit position or working position, the locking nut 18 is loosened, and the adjusting screw 19 rotates counterclockwise, causing the power connection 20 to move horizontally to the right with the adjusting screw 19. This causes the rollers II23 in the roller cage II22 to roll clockwise along the surfaces of rollers I10 and III12, causing the execution layer module 2 to rise. When the execution layer module 2 rises to the ideal position, the locking nut 18 is rotated clockwise to contact the roller cage II22, thereby achieving locking at any position during the upward movement of the stroke adjustment mechanism.

[0073] During descent, such as Figure 19As shown, when the adjustment layer module 6 is in the highest limit position or working position, the locking nut 18 is loosened and the adjusting screw 19 is rotated clockwise, causing the power connection 20 to move horizontally to the left with the adjusting screw 19. This causes the roller II23 in the roller cage II22 to roll counterclockwise along the surfaces of roller I10 and roller III12, causing the execution layer module 2 to descend. When the execution layer module 2 descends to the ideal position, the locking nut is rotated clockwise to make it contact the roller cage II22, thereby achieving locking at any position during the descent of the stroke adjustment mechanism.

[0074] Table 1 below shows the detailed analysis process of the stroke adjustment mechanism under various conditions when the roller diameter D = 10 mm.

[0075] Table 1 Number of roller layers n=3

[0076]

[0077] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A stroke adjustment mechanism, characterized in that, The system includes a fixed layer module (1), an execution layer module (2), a locking mechanism (4), a power mechanism (5), and an adjustment layer module (6). The adjustment layer module (6) is installed between the fixed layer module (1) and the execution layer module (2) arranged vertically. The locking mechanism (4) is installed on one side of the adjustment layer module (6), and the power mechanism (5) is installed on the other side of the adjustment layer module (6). The power mechanism (5) is movably arranged along a first preset direction to drive the adjustment layer module (6) to move so that the execution layer module (2) is arranged relatively close to or far away from the fixed layer module (1) in a second preset direction. The fixed layer module (1) includes a lower base (8), a roller retainer I (9) mounted on the lower base (8), and rollers I (10) embedded in the roller retainer I (9). The rollers I (10) are used to support the movement of the adjustment layer module (6). The adjustment layer module (6) includes a roller retainer II (22) mounted on the lower base (8) and rollers II (23) embedded in the roller retainer II (22); the upper and lower extension plates of the roller retainer II (22) are used to limit the rollers I (10) and III (13) respectively; The execution layer module (2) includes an upper base (11), a roller retainer III (12), and rollers III (13); the rollers III (13) are embedded in the roller retainer III (12), and the roller retainer III (12) is installed on the lower part of the upper base (11) and is arranged vertically parallel to the roller retainer I (9) based on the adjustment layer module (6); The rollers I (10), II (23), and III (13) are tangentially fitted by surface line contact, and the distance d between the center of roller I (10) and the center of roller II (23) and the distance d between the center of roller II (23) and the center of roller III (13) are equal. The stroke adjustment mechanism further includes a shell portion (3) surrounding the outer periphery of the adjustment layer module (6) and the shell portion (3) is fixed to the fixed layer module (1); the power mechanism (5) includes an adjustment screw (19) and a power connection block (20); wherein, the adjustment screw (19) is threadedly engaged with one side of the shell portion (3) to transmit force to the power connection block (20) at the end of the adjustment screw (19) so that the power connection block (20) is movably arranged along a first preset direction; the power connection block (20) engages with an open slot at one end of the roller retainer II (22) in the adjustment layer module (6) to realize the position change of the adjustment layer module (6) in the first preset direction and the second preset direction; wherein, the opening of the open slot faces the execution layer module (2).

2. The stroke adjustment mechanism according to claim 1, characterized in that, The adjustment layer module (6) also includes a front baffle (29) and a rear baffle (30) of roller II mounted on the lower base (8); the front baffle (29) and the rear baffle (30) of roller II are arranged in parallel on opposite sides of roller cage II (22) based on roller cage II (22), thereby limiting the roller II (23) in roller cage II (22).

3. The stroke adjustment mechanism according to claim 1, characterized in that, The power connection block (20) includes a connecting part, a first snap-fit ​​part, and a second snap-fit ​​part. One end of the connecting part is connected to the first snap-fit ​​part, and the other end of the connecting part is connected to the second snap-fit ​​part. The connecting part is inserted into an opening groove to engage the snap-fit ​​member composed of the first snap-fit ​​part and the second snap-fit ​​part with the roller cage II (22).

4. The stroke adjustment mechanism according to claim 1, characterized in that, The stroke adjustment mechanism also includes a guide mechanism (7) disposed on the fixed layer module (1) for guiding the movement of the execution layer module (2).

5. The stroke adjustment mechanism according to claim 4, characterized in that, The guiding mechanism (7) includes a guide post (24), a guide sleeve (25), and a guide post support (26). One end of the guide post (24) is in clearance fit with the guide sleeve (25) installed at the lower part of the execution layer module (2), and the other end of the guide post (24) passes through the guide post support (26) and is fixed to the fixing layer module (1).

6. The stroke adjustment mechanism according to claim 5, characterized in that, The guide mechanism (7) also includes a fisheye screw (27) and a tension spring (28); one end of the tension spring (28) is connected to the fisheye screw (27) fixed at the lower part of the execution layer module (2), and the other end of the tension spring (28) is connected to the fisheye screw (27) fixed at the upper part of the fixing layer module (1), so that the tension spring (28) is always in a stretched state.

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