A linear displacement self-homing mechanism and its assembly method

Abstract

The present invention relates to a linear displacement self-resetting mechanism, comprising a housing, a linear displacement rod, and a housing adjustment nut; the right end of the linear displacement rod is sequentially sleeved with a first guide spring pad, a return spring, and a second guide spring pad; a linear displacement rod adjustment nut is provided on the linear displacement rod for adjusting the compression of the return spring, and is locked to the linear displacement rod by a first locking screw and a second locking screw; the linear displacement rod is placed in a cylinder on the right side of the housing and is limited by the housing adjustment nut, so that the left side of the first guide spring pad simultaneously contacts the right step plane of the cylinder on the right side of the housing and the right end shoulder of the linear displacement rod, and the right side of the second guide spring pad simultaneously contacts the left side of the linear displacement rod adjustment nut and the left side of the housing adjustment nut; the housing adjustment nut is locked to the housing by a third locking screw and a fourth locking screw. Compared with the prior art, the present invention has the advantages of linear displacement self-resetting, wide application range, and small size.

Description

Technical Field

[0001] The present invention relates to the field of mechanical mechanisms, and in particular to a linear displacement self-homing mechanism and an assembly method thereof. Background Art

[0002] Most self-homing linear displacement mechanisms use dual elastic elements (springs, magnets, etc.) mounted on both sides to achieve mechanical self-homing, or use an electronic control mechanism to precisely return the mechanism to its original position. These mechanical mechanisms cannot guarantee self-homing under small displacement conditions, while these electronic control mechanisms require more sophisticated control and transmission structures to achieve homing.

[0003] Chinese patent CN204664254U discloses a self-homing electromagnetic shock absorber that uses an electromagnet as an elastic element and a nitrogen chamber as a resistance element, achieving passive vibration reduction during vehicle driving. However, the self-homing effect does not completely return to zero, but rather allows for free movement within a larger range.

[0004] Chinese patent CN213948561U discloses a hyperbolic airbag steering return mechanism. Through the design of a hyperbolic rod and a limit block, it cleverly converts the bilateral displacement into compression of the same airbag, realizing the self-returning movement of the displacement. However, its return to position requires a larger space on one side for its installation. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a linear displacement self-positioning mechanism and an assembly method thereof, which can realize mechanical linear displacement self-positioning within a large range and a small range.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A linear displacement self-returning mechanism, the self-returning mechanism includes a shell, a linear displacement rod and a shell adjusting nut; the right end of the linear displacement rod is sequentially covered with a first guide spring pad, a return spring and a second guide spring pad; a linear displacement rod adjusting nut is provided on the linear displacement rod for adjusting the compression amount of the return spring, and after the adjustment is completed, it is locked to the linear displacement rod by the first locking screw and the second locking screw; the linear displacement rod is placed in the right cylinder of the shell and is limited by the shell adjusting nut, so that the left side of the first guide spring pad simultaneously contacts the right step plane of the right cylinder of the shell and the right end shoulder of the linear displacement rod, and the right side of the second guide spring pad simultaneously contacts the left side of the linear displacement rod adjusting nut and the left side of the shell adjusting nut; the shell adjusting nut is locked to the shell by the third locking screw and the fourth locking screw after the limitation is completed.

[0008] Furthermore, the linear displacement rod also includes an external thread area and a step; the diameter of the right end shoulder is larger than the diameter of the other parts of the linear displacement rod; the external thread area is a fine thread area, which is used to ensure self-locking under oil lubrication conditions; the external thread area is slightly larger than the area that engages with the linear displacement rod adjusting nut from the right end to the left; the step is the starting position of the external thread area, and is also the lateral limiting feature of the self-resetting mechanism.

[0009] Furthermore, the first guide spring pad and the second guide spring pad are spring pads made of a mixed material, the main body of the spring pad is made of low-friction plastic, and the bottom of the spring pad is made of elastic material; a bayonet is provided on the main body of the spring pad for tightly connecting the main body of the spring pad and the bottom of the spring pad.

[0010] Furthermore, the return spring is a pre-compression spring, and its pre-compression amount is determined by the thread engagement depth of the linear displacement rod adjusting nut; the thread engagement depth of the linear displacement rod adjusting nut is related to the thread engagement depth of the shell adjusting nut and the two have the same thickness.

[0011] Furthermore, the diameter of the inner annular surface of the main body of the first guide spring pad is larger than the diameter of the linear displacement rod, and is provided with a chamfer to prevent jamming; the diameter of the outer annular surface of the main body of the first guide spring pad is smaller than the diameter of the inner annular surface of the return spring to ensure that the two are slightly combined with each other; the right side plane of the first guide spring pad is in close contact with the left flattened annular surface of the return spring.

[0012] Furthermore, the second guide spring pad and the first guide spring pad are mirror-image assemblies, and the shape, function, material, process and assembly of the second guide spring pad are completely consistent with those of the first guide spring pad.

[0013] Furthermore, the maximum diameter of the linear displacement rod, the maximum diameter of the first guide spring pad, the maximum diameter of the second guide spring pad, and the maximum diameter of the return spring are all smaller than the inner diameter of the cylinder on the right side of the shell; the maximum diameter of the linear displacement rod adjusting nut is smaller than the minimum diameter of the shell adjusting nut.

[0014] An assembly method for the linear displacement self-homing mechanism, the assembly method comprising the following steps:

[0015] 1) Lubricate the outer surface of the linear displacement rod and pass it through the first guide spring pad, the return spring, and the second guide spring pad in sequence;

[0016] 2) Use the linear displacement rod adjustment nut to pre-tighten it into the external thread area of ​​the linear displacement rod to compress the return spring. The pre-compression amount is determined by the calculation formula. Pre-tighten it quickly first. When it is about to reach the designed position, slow down the tightening speed and use a distance measuring tool to measure the length of the return spring. Finally, the return spring length reaches the set pre-compression amount. After the linear displacement rod adjustment nut is in place, use the first locking screw and the second locking screw to lock the linear displacement rod adjustment nut.

[0017] 3) Lubricate the inner surface of the housing and insert the linear displacement rod assembled in 2) into the corresponding position of the housing;

[0018] 4) Pre-tighten the housing adjusting nut into the threaded area of ​​the housing to a depth determined by the assembly design. When the right surface of the housing adjusting nut is about to align with the right surface of the linear displacement rod adjusting nut, slow down the tightening speed and use a torque measuring tool to measure the torque of the housing adjusting nut. When the torque is greater than the set torque, reverse the housing adjusting nut until the torque reaches the set torque and the left plane of the linear displacement rod adjusting nut aligns with the left plane of the housing adjusting nut.

[0019] 5) Test whether the self-returning mechanism operates correctly. If not, return to 4) and tighten the housing adjustment nut using the third and fourth locking screws.

[0020] Furthermore, the calculation formula in 2) is specifically:

[0021] s=F / k

[0022] Where s is the pre-compression amount, F is the zero return force, and k is the spring stiffness coefficient.

[0023] Furthermore, the linear displacement rod adjustment nut is an adjustment nut with a hexagonal assembly feature, which is assembled using a hexagonal tool; the housing adjustment nut is an adjustment nut with a semicircular assembly feature at the minimum diameter, which is assembled using a special tool; the first locking screw, the second locking screw, the third locking screw and the fourth locking screw are all locking screws with a conical top feature and an inner hexagonal assembly feature, which are assembled using a hexagonal tool and locked using a deformation method.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention, through the special design of the linear displacement rod and its interaction with the return spring, guide spring pad, and adjusting nut, enables the linear displacement rod to return to the zero position of the housing only through mechanical movement after displacement movement. At the same time, the housing or the linear displacement rod can be flexibly selected as the connecting mechanism of the displacement element, and mechanical linear displacement self-returning can be achieved within both a large range and a small range.

[0026] 2. The linear displacement self-homing mechanism of the present invention has a simple structure, compact parts, high response speed, and long service life. It can be used in most other mechanisms with high linear displacement self-homing accuracy; and its small size can be used in other typical displacement mechanisms such as automobile wire-controlled steering. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a partial enlarged view of the structure of the present invention;

[0029] Figure 3 Schematic diagram of the linear displacement rod structure of the present invention;

[0030] Figure 4 This is a schematic structural diagram of the first guide spring coil of the present invention;

[0031] Figure 5 Schematic diagram of the return spring structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the linear displacement rod adjustment nut structure of the present invention;

[0033] Figure 7 This is a schematic diagram of the locking screw structure of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of the housing adjusting nut of the present invention;

[0035] Figure 9 This is a model diagram of the self-aligning principle of the linear displacement self-homing mechanism of the present invention;

[0036] Figure 10 A physical model diagram of the linear displacement self-homing mechanism of the present invention;

[0037] Figure 11 FIG. 1 is a diagram showing the relationship between the specific restoring force effect and the required restoring force effect and the relative displacement according to an embodiment of the present invention.

[0038] The numbers in the figure indicate:

[0039] 1. Housing, 101, right step plane, 2. Linear displacement rod, 201, right end shoulder, 202, external thread area, 203, step, 3. First guide spring pad, 4. Return spring, 5. Second guide spring pad, 6. Linear displacement rod adjustment nut, 7. First locking screw, 8. Second locking screw, 9. Housing adjustment nut, 10. Third locking screw, 11. Fourth locking screw. DETAILED DESCRIPTION

[0040] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0041] Example

[0042] like Figures 1-2 As shown, a linear displacement self-returning mechanism includes a housing 1, a linear displacement rod 2 and a housing adjustment nut 9; the right end of the linear displacement rod 2 is sequentially sleeved with a first guide spring pad 3, a return spring 4 and a second guide spring pad 5; a linear displacement rod adjustment nut 6 is provided on the linear displacement rod 2 for adjusting the compression amount of the return spring 4, and after the adjustment is completed, it is locked on the linear displacement rod 2 by a first locking screw 7 and a second locking screw 8; the linear displacement rod 2 is placed in the right cylinder of the housing 1 and is limited by the housing adjustment nut 9 so that the left side of the first guide spring pad 3 contacts the right cylinder of the housing 1 at the same time. The right side step plane 101 is in contact with the right end shoulder 201 of the linear displacement rod 2, and the right side of the second guide spring pad 5 contacts the left side of the linear displacement rod adjusting nut 6 and the left side of the shell adjusting nut 9 at the same time; the shell adjusting nut 9 is locked on the shell 1 by the third locking screw 10 and the fourth locking screw 11 after the limiting is completed; the maximum diameter of the linear displacement rod 2, the maximum diameter of the first guide spring pad 3, the maximum diameter of the second guide spring pad 5, and the maximum diameter of the return spring 4 are all smaller than the inner diameter of the cylinder on the right side of the shell 1; the maximum diameter of the linear displacement rod adjusting nut 6 is smaller than the minimum diameter of the shell adjusting nut 9.

[0043] like Figure 3 As shown, the linear displacement rod 2 also includes an external thread area 202 and a step 203; the diameter of the right end shoulder 201 is larger than the diameter of the other parts of the linear displacement rod 2; the external thread area 202 is a fine thread area, which is used to ensure self-locking under oil lubrication conditions; the external thread area 202 is slightly larger than the area that engages with the linear displacement rod adjusting nut 6 from the right end to the left; the step 203 is the starting position of the external thread area 202, and is also the lateral limiting feature of the self-resetting mechanism.

[0044] like Figure 4As shown, the first guide spring pad 3 and the second guide spring pad 5 are spring pads made of a mixed material, the main body of the spring pad is made of Teflon, brass or other low-friction plastics, and the bottom of the spring pad is made of rubber or other elastic materials, and the two are tightly bonded; a bayonet is provided on the main body of the spring pad for tightly connecting the main body of the spring pad and the bottom of the spring pad; the inner annular surface diameter of the main body of the first guide spring pad 3 is larger than the diameter of the linear displacement rod 2, and is provided with a chamfer to prevent jamming; the outer annular surface diameter of the main body of the first guide spring pad 3 is smaller than the inner annular surface diameter of the return spring 4, to ensure that the two are slightly combined with each other; the right side plane of the first guide spring pad 3 is in close contact with the left flattened annular surface of the return spring 4; the second guide spring pad 5 and the first guide spring pad 3 are a mirror image assembly, and the shape, function, material, process and assembly of the second guide spring pad 5 are completely consistent with those of the first guide spring pad 3.

[0045] like Figure 5 As shown, the return spring 4 is a pre-compression spring, and its pre-compression amount is determined by the thread engagement depth of the linear displacement rod adjusting nut 6; the thread engagement depth of the linear displacement rod adjusting nut 6 is related to the thread engagement depth of the shell adjusting nut 9 and the two have the same thickness.

[0046] An assembly method for the linear displacement self-homing mechanism, the assembly method comprising the following steps:

[0047] 1) Lubricate the outer surface of the linear displacement rod 2 and pass it through the first guide spring pad 3, the return spring 4 and the second guide spring pad 5 in sequence;

[0048] 2) Use the linear displacement rod adjusting nut 6 to pre-tighten into the external threaded area 201 of the linear displacement rod 2 to compress the return spring 4. The pre-compression amount is determined by a calculation formula. Pre-tighten quickly first. When the designed position is about to be reached, slow down the tightening speed and use a distance measuring tool to measure the length of the return spring 4. Finally, the length of the return spring 4 reaches the set pre-compression amount. After the linear displacement rod adjusting nut 6 is in place, use the first locking screw 7 and the second locking screw 8 to lock the linear displacement rod adjusting nut 6. The calculation formula is as follows:

[0049] s=F / k

[0050] Where s is the pre-compression amount, F is the zero return force, and k is the spring stiffness coefficient;

[0051] 3) Lubricate the inner surface of the housing 1 in advance to prevent scratches, and insert the linear displacement rod 2 assembled in 2) into the corresponding position of the housing 1;

[0052] 4) Pre-tighten the housing adjusting nut 9 into the threaded area of ​​the housing 1 to a depth determined by the assembly design. When the right surface of the housing adjusting nut 9 is about to align with the right surface of the linear displacement rod adjusting nut 6, slow down the tightening speed and use a torque measuring tool to measure the torque applied to the housing adjusting nut 9. When the torque is greater than the set torque, tighten the housing adjusting nut 9 in the opposite direction until the torque reaches the set torque and the left plane of the linear displacement rod adjusting nut 6 aligns with the left plane of the housing adjusting nut 9.

[0053] 5) Test whether the self-returning mechanism operates correctly. If not, return to 4) and tighten the housing adjustment nut 9 using the third locking screw 10 and the fourth locking screw 11.

[0054] The calculation formula in 2) is specifically:

[0055] s=F / k

[0056] Where s is the pre-compression amount, F is the zero return force, and k is the spring stiffness coefficient.

[0057] like Figures 6-8 As shown, the linear displacement rod adjustment nut 6 has a hexagonal assembly feature, which is assembled using a hexagonal tool; the minimum diameter on the shell adjustment nut 9 has a semicircular assembly feature, which is assembled using a special tool; the first locking screw 7, the second locking screw 8, the third locking screw 10 and the fourth locking screw 11 all have a cone top feature and an inner hexagonal assembly feature, which are assembled using a hexagonal tool and locked using a deformation method.

[0058] like Figure 9 As shown, the self-homing principle of the linear displacement self-homing mechanism of the present invention is:

[0059] The return spring 4 of the self-returning mechanism is a pre-compressed spring, that is, when the self-returning mechanism is in the zero position, the return spring 4 is still in a compressed state. The self-returning mechanism has three states: the zero position state, the relative left displacement state, and the relative right displacement state.

[0060] When the linear displacement rod 2 is in zero position, its second guide spring pad 5 contacts the housing adjustment nut 9 and the linear displacement rod adjustment nut 6 at the same time, and the first guide spring pad 3 contacts the right step plane 101 of the right cylinder of the housing 1 and the right end shoulder 201 of the linear displacement rod 2 at the same time. At this time, the elastic forces on both sides of the return spring 4 are simultaneously transmitted to the housing 1 and the linear displacement rod 2 with equal magnitude and opposite directions, and the linear displacement rod 2 remains stationary.

[0061] When the linear displacement rod 2 displaces to the left, it pushes the first guide spring pad 3 to the left so that it leaves the right step plane 101 of the right cylinder of the shell 1, and the linear displacement rod adjusting nut 6 leaves the second guide spring pad 5. The second guide spring pad 5 is only stationary with the shell adjusting nut 9, so spring compression is generated. The second spring pad 5 acts as a support, and the return spring 4 gives the first guide spring pad 3 an elastic force to the right, thereby pushing the linear displacement rod 2 back to zero position.

[0062] When the linear displacement rod 2 displaces to the right, it pushes the second guide spring pad 5 to the right to leave the housing adjustment nut 9, and the right end shoulder 201 of the linear displacement rod 2 leaves the first guide spring pad 3. The first guide spring pad 3 is only stationary with the right step plane 101 of the right cylinder of the housing 1, so spring compression is generated. The first guide spring pad 3 acts as a support, and the return spring 4 gives the second guide spring pad 5 an elastic force to the left, thereby pushing the linear displacement rod 2 back to zero position.

[0063] like Figure 10 As shown in FIG, a physical model of the linear displacement self-homing mechanism of the present invention is constructed, and this figure can more clearly show the relationship between the various components.

[0064] like Figure 11 As shown, the specific return force effect of an embodiment of the linear displacement self-homing mechanism of the present invention and the relationship between the required return force effect and the relative displacement are demonstrated. As can be seen from the figure, in most of the bilaterally symmetrical intervals (∞, -a) ∪ (a, ∞), the return force generated by the linear displacement self-homing mechanism of the present invention is already greater than the required return force, and it can achieve the self-homing effect, that is, the self-homing effect of the linear displacement rod 2; in the small middle interval (-a, a), the return force generated by the linear displacement self-homing mechanism of the present invention is already less than the required return force, and cannot produce the return effect. The size of a is related to the rubber side stiffness of the first guide spring pad 3 and the second guide spring pad 5, and the rubber side stiffness of the first guide spring pad 3 and the second guide spring pad 5 is directly related to the processing and assembly accuracy and the self-homing response characteristics of the self-homing mechanism. Its specific size needs to be designed based on the three factors.

[0065] The linear displacement self-homing mechanism of the present invention can realize mechanical linear displacement self-homing within a large range and a small range, and has a simple structure, compact parts, high response speed, and long service life. It can be used in most other mechanisms with high linear displacement self-homing accuracy. It has a small size and can be used in other typical displacement mechanisms such as automobile wire-controlled steering devices.

[0066] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A linear displacement self-homing mechanism, characterized in that: The self-resetting mechanism comprises a housing (1), a linear displacement rod (2) and a housing adjustment nut (9); the right end of the linear displacement rod (2) is covered with a first guide spring pad (3), a return spring (4) and a second guide spring pad (5) in sequence; a linear displacement rod adjustment nut (6) is provided on the linear displacement rod (2) for adjusting the compression amount of the return spring (4), and after the adjustment is completed, the linear displacement rod (2) is locked by a first locking screw (7) and a second locking screw (8); the linear displacement rod (2) is placed in the housing The housing (1) is positioned in the right cylinder and is limited by the housing adjusting nut (9), so that the left side of the first guide spring pad (3) contacts the right step plane (101) of the right cylinder of the housing (1) and the right end shoulder (201) of the linear displacement rod (2) at the same time, and the right side of the second guide spring pad (5) contacts the left side of the linear displacement rod adjusting nut (6) and the left side of the housing adjusting nut (9) at the same time; the housing adjusting nut (9) is locked on the housing (1) by the third locking screw (10) and the fourth locking screw (11) after the positioning is completed; The linear displacement rod (2) further includes an external thread area (202) and a step (203); the diameter of the right end shoulder (201) is larger than the diameter of the other parts of the linear displacement rod (2); the external thread area (202) is a fine thread area, which is used to ensure self-locking under oil lubrication conditions; the external thread area (202) is slightly larger than the area meshing with the linear displacement rod adjustment nut (6) from the right end to the left; the step (203) is the starting position of the external thread area (202) and is also the lateral limiting feature of the self-resetting mechanism.

2. A linear displacement self-homing mechanism according to claim 1, characterized in that: The first guide spring pad (3) and the second guide spring pad (5) are spring pads made of mixed materials, the main body of the spring pad is made of low-friction plastic, and the bottom of the spring pad is made of elastic material; a bayonet is provided on the main body of the spring pad for tightly connecting the main body of the spring pad and the bottom of the spring pad.

3. The linear displacement self-homing mechanism according to claim 1, characterized in that: The return spring (4) is a pre-compression spring, and its pre-compression amount is determined by the thread engagement depth of the linear displacement rod adjustment nut (6); the thread engagement depth of the linear displacement rod adjustment nut (6) is related to the thread engagement depth of the housing adjustment nut (9), and the two have the same thickness.

4. A linear displacement self-homing mechanism according to claim 2, characterized in that: The diameter of the inner annular surface of the main body of the first guide spring pad (3) is larger than the diameter of the linear displacement rod (2), and is provided with a chamfer to prevent it from getting stuck; the diameter of the outer annular surface of the main body of the first guide spring pad (3) is smaller than the diameter of the inner annular surface of the return spring (4), to ensure that the two are slightly combined with each other; the right side plane of the first guide spring pad (3) is in close contact with the left flattened annular surface of the return spring (4).

5. The linear displacement self-homing mechanism according to claim 4, characterized in that: The second guide spring pad (5) and the first guide spring pad (3) are mirror-image assemblies, and the shape, function, material, process and assembly of the second guide spring pad (5) are completely consistent with those of the first guide spring pad (3).

6. The linear displacement self-homing mechanism according to claim 1, characterized in that: The maximum diameter of the linear displacement rod (2), the maximum diameter of the first guide spring pad (3), the maximum diameter of the second guide spring pad (5), and the maximum diameter of the return spring (4) are all smaller than the inner diameter of the cylinder on the right side of the housing (1); the maximum diameter of the linear displacement rod adjustment nut (6) is smaller than the minimum diameter of the housing adjustment nut (9).

7. An assembly method for the linear displacement self-homing mechanism according to claim 1, characterized in that: The assembly method comprises the following steps: 1) Lubricate the outer surface of the linear displacement rod (2), and pass it through the first guide spring pad (3), the return spring (4), and the second guide spring pad (5) in sequence; 2) Use the linear displacement rod adjusting nut (6) to pre-screw into the external thread area (202) of the linear displacement rod (2) to compress the return spring (4). The pre-compression amount is determined by a calculation formula. Pre-tighten quickly first. When the designed position is about to be reached, slow down the screwing speed and use a distance measuring tool to measure the length of the return spring (4). Finally, the length of the return spring (4) reaches the set pre-compression amount. After the linear displacement rod adjusting nut (6) is in place, use the first locking screw (7) and the second locking screw (8) to lock the linear displacement rod adjusting nut (6); 3) Lubricate the inner surface of the housing (1) and insert the linear displacement rod (2) assembled in 2) into the corresponding position of the housing (1); 4) Use the housing adjusting nut (9) to pre-screw it into the threaded area of ​​the housing (1). The depth is determined by the assembly design. When the right surface of the housing adjusting nut (9) is about to coincide with the right surface of the linear displacement rod adjusting nut (6), slow down the screwing speed and use a torque measuring tool to measure the torque of the housing adjusting nut (9). When the torque is greater than the set torque, screw the housing adjusting nut (9) in the opposite direction until the torque reaches the set torque, so that the left plane of the linear displacement rod adjusting nut (6) coincides with the left plane of the housing adjusting nut (9); 5) Test whether the self-returning mechanism operates correctly. If not, return to step 4). If yes, use the third locking screw (10) and the fourth locking screw (11) to tighten the housing adjustment nut (9).

8. The assembly method according to claim 7, characterized in that: The calculation formula in 2) is specifically: Where s is the pre-compression amount, F is the zero return force, and k is the spring stiffness coefficient.

9. The assembly method according to claim 7, characterized in that: The linear displacement rod adjusting nut (6) is an adjusting nut with a hexagonal assembly feature and is assembled using a hexagonal tool; the housing adjusting nut (9) is an adjusting nut with a semicircular assembly feature at the minimum diameter and is assembled using a special tool; the first locking screw (7), the second locking screw (8), the third locking screw (10) and the fourth locking screw (11) are all locking screws with a conical top feature and an inner hexagonal assembly feature and are assembled using a hexagonal tool and locked in a deformation manner.

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