Dovetail groove guide rail anti-loosening device and installation and adjustment method

Abstract

The present invention discloses a dovetail groove guide rail anti-loosening device, including a piston mechanism, a rotating shaft, a coarse adjustment nut and a fine adjustment handwheel. The piston is a combination of a wedge block and a cylinder. The upper and lower sides of the wedge block are embedded in a through straight groove in the middle of one side of the dovetail groove. The piston rod passes through a through hole that passes through the side of the dovetail groove body. The butterfly spring group is embedded in the dovetail groove countersunk hole, and the butterfly spring group is positioned in the dovetail groove countersunk hole by a round nut. The end of the rotating shaft is threadedly connected with the end of the piston rod, and the other end of the rotating shaft passes through the coarse adjustment nut and the fine adjustment handwheel in turn, and is fixed in the fine adjustment handwheel countersunk hole at one end of the fine adjustment handwheel by a fastening nut. The installation and adjustment method of the present invention includes 1) installing the piston mechanism, the coarse adjustment nut, the rotating shaft and the fine adjustment handwheel, and 2) completing the gap adjustment between the dovetail block and the dovetail groove. The present invention performs coarse adjustment and fine adjustment operations respectively by using a coarse adjustment nut and a fine adjustment handwheel that are sleeved together, which is very convenient to use and improves the adjustment efficiency of the gap between the dovetail block and the dovetail groove.

Description

Technical Field

[0001] The invention relates to a dovetail groove guide rail device, in particular to a device and an installation and adjustment method for preventing a dovetail block and a dovetail groove from loosening due to an increased gap after long-term use, belonging to the technical field of guide rail transmission. Background Art

[0002] The dovetail groove guide pair consists of a dovetail block and a dovetail groove body. The dovetail block is embedded in the dovetail groove. There are two installation types: the dovetail block is on the dovetail groove and the dovetail groove is below or the dovetail block is on the dovetail groove. It is widely used in various instruments and equipment due to its smooth movement and high precision. The dovetail block and the dovetail groove body are generally made of steel or cast iron. During long-term use, there will be different degrees of wear between the contact surfaces of the two, and the increase in the gap affects the accuracy of the equipment. The usual solution is to embed a wedge strip between the adjacent surfaces of the dovetail block and one side of the dovetail groove, and then screw in a screw on the outside of the dovetail groove body to adjust the gap between the wedge strip and one side of the dovetail block. However, with the long-term operation of the dovetail groove guide pair, the wedge strip may move to one side and be damaged, seriously affecting the transmission accuracy of the dovetail groove guide pair. In addition, when the dovetail guide pair adopts the installation type with the dovetail groove facing up and the dovetail block facing down, a structure that increases the friction between the two is generally used to prevent the dovetail block from sliding freely. However, it is difficult to adjust the friction accurately and conveniently, which affects work efficiency and poses a safety hazard. Summary of the invention

[0003] The purpose of the present invention is to provide a dovetail groove guide rail anti-loosening device and an installation and adjustment method, so as to quickly and accurately adjust the gap between the dovetail block and the dovetail groove.

[0004] The present invention is achieved through the following technical solutions:

[0005] A dovetail groove guide rail loosening prevention device comprises a piston mechanism, a rotating shaft, a coarse adjustment nut and a fine adjustment hand wheel installed inside and outside one side of a dovetail groove body, the piston mechanism comprises a piston, a butterfly spring group and a round nut, the piston is a combination of a wedge block and a cylinder, the inclination of the outer inclined surface of the wedge block matches the inclined surface of the dovetail groove, a cylindrical piston rod extends outward from the center of the vertical surface inside the wedge block, the upper and lower sides of the wedge block are embedded in the through straight groove in the middle of one side of the dovetail groove, the piston rod passes horizontally through the through hole that passes through the side of the dovetail groove body, the butterfly spring group sleeved on the piston rod is embedded in the dovetail groove countersunk hole on the outer side of the dovetail groove body, and the butterfly spring group is positioned in the dovetail groove countersunk hole by screwing on the round nut on the threaded end of the piston rod, and the outer side of the dovetail groove body is also welded to one end of the threaded tube; one end of the rotating shaft is threadedly connected to the end of the piston rod, and the other end of the rotating shaft passes through the coarse adjustment nut and the fine adjustment hand wheel in turn, and is fixed in the fine adjustment hand wheel countersunk hole at one end of the fine adjustment hand wheel by tightening the nut.

[0006] The purpose of the present invention can be further achieved by the following technical measures.

[0007] Furthermore, the coarse-adjustment nut and the fine-adjustment handwheel are both stepped shaft structures, one end of the coarse-adjustment nut is an externally threaded rod, and the other end is a hexagon, the externally threaded rod is screwed into the threaded barrel; the small-end shaft of the fine-adjustment handwheel extends into the rear countersunk hole at the other end of the coarse-adjustment nut; a circular plate radially extends from one end of the rotating shaft, the circular plate is embedded in the front countersunk hole at one end of the coarse-adjustment nut, and a rotating shaft screw extends axially from the center of the circular plate, and the rotating shaft screw is screwed into the threaded hole at the end of the piston rod; the middle part of the rotating shaft is a round rod and a square rod connected to each other, the round rod passes through the central circular hole of the coarse-adjustment nut, the square rod passes through the central square hole of the fine-adjustment handwheel, and the screw at the end of the square rod is fixedly connected to the fastening nut in the countersunk hole at the other end of the fine-adjustment handwheel.

[0008] Furthermore, a front ring groove is respectively provided between the circular plate and the bottom of the front countersunk hole of the coarse adjustment nut, and a rear ring groove is respectively provided between the end face of the small end shaft of the fine-tuning handwheel and the rear countersunk hole at the other end of the coarse adjustment nut. The curvature of the front ring groove and the curvature of the rear ring groove respectively match the curvature of the steel ball, and a plurality of steel balls forming a circle are respectively located in the front ring groove and the rear ring groove.

[0009] Furthermore, the screw thread of the rotating shaft is a fine pitch thread, and the external thread of the coarse adjustment nut is a coarse pitch thread. The pitch ratio of the coarse pitch thread to the fine pitch thread is 3-4.

[0010] A method for installing and adjusting a dovetail groove guide rail anti-loosening device, comprising the following steps:

[0011] 1) Install the piston mechanism, and pass the piston rod at the other end of the piston horizontally through the through hole that penetrates the side of the dovetail groove, so that the upper and lower sides of the wedge block at one end of the piston are embedded in the through straight groove positioned on one side of the dovetail groove; then put the butterfly spring assembly on the piston rod, and the butterfly spring assembly passes through the inner hole of the threaded barrel and is embedded in the dovetail groove countersunk hole on the outside of the dovetail groove, and the round nut is screwed on the threaded end of the piston rod;

[0012] 2) Install the coarse adjustment nut and the rotating shaft in sequence. First, apply grease to the front ring groove at the bottom of the front countersunk hole of the coarse adjustment nut and put a circle of multiple steel balls in it. Then, pass one end of the rotating shaft through the central circular hole of the coarse adjustment nut so that the circular plate of the rotating shaft is embedded in the front countersunk hole of the coarse adjustment nut. The front ring groove of the circular plate and the front ring groove at the bottom of the front countersunk hole of the coarse adjustment nut are respectively against the two sides of the circle of multiple steel balls. Then, screw the external threaded rod of the coarse adjustment nut into the threaded barrel so that the rotating shaft screw is aligned with the central threaded hole of the threaded end of the piston rod.

[0013] 3) Install the fine-tuning handwheel. First, apply grease to the rear ring groove on the end face of the small end shaft of the fine-tuning handwheel and put in a circle of multiple steel balls. Then, put the center square hole of the fine-tuning handwheel on the square rod of the rotating shaft, and the two sides of the circle of multiple steel balls respectively abut against the rear ring groove of the rear countersunk hole at the other end of the coarse-adjusting nut and the rear ring groove on the end face of the small end shaft of the fine-tuning handwheel; then, put a washer on the square rod end screw that passes through the fine-tuning handwheel countersunk hole at the other end of the fine-tuning handwheel, and then screw on the nut; then, turn the fine-tuning handwheel clockwise to drive the square rod to rotate through the center square hole of the fine-tuning handwheel, and screw the rotating shaft screw into the center threaded hole of the threaded end of the piston rod; continue to turn the fine-tuning handwheel clockwise until the fine-tuning handwheel cannot be turned; then turn the fine-tuning handwheel counterclockwise to determine the number of rotations of the fine-tuning handwheel according to the fine-pitch thread pitch of the rotating shaft screw, so that the distance L3 between the end face of the external threaded rod at one end of the coarse-adjusting nut and the end face of the threaded end of the piston rod is 5mm;

[0014] 4) Complete the gap adjustment between the dovetail block and the dovetail groove, use a wrench to turn the hexagon at the other end of the coarse adjustment nut clockwise, the external threaded rod of the coarse adjustment nut is screwed into the threaded barrel, and the coarse adjustment nut pushes the wedge block of the piston to move toward the inclined surface of one side of the dovetail block through the shaft screw at one end of the shaft, until the exposed length L2 of the external threaded rod of the coarse adjustment nut meets the requirement; then turn the fine adjustment handwheel counterclockwise, the shaft rotates counterclockwise to push the threaded end of the piston rod to overcome the elastic force of the butterfly spring group and move toward the side of the adjacent dovetail block, and the gap L1 between the inclined surface of the wedge block and the inclined surface of the dovetail block is reduced; use a feeler gauge to check that the gap L1 meets the requirement; when the fine adjustment handwheel is turned clockwise, the shaft rotates clockwise to push the threaded end of the piston rod to move away from the dovetail groove, and the gap L1 between the inclined surface of the wedge block and the inclined surface of the dovetail block is increased.

[0015] Furthermore, in the step 4), L2≥L1+10mm.

[0016] The present invention connects the piston mechanism, the rotating shaft, the coarse adjustment nut and the fine adjustment hand wheel arranged in sequence into one body through the rotating shaft. According to the different lengths of the dovetail groove guide rail, the present invention can be arranged one or more outside one side of the dovetail groove body. By rotating the coarse adjustment nut and the fine adjustment hand wheel respectively, the piston can only move linearly, and the gap between the dovetail block and the side of the dovetail groove can be coarsely adjusted and finely adjusted respectively. The two rotate independently and will not rotate with each other. The operation is very convenient, and the adjustment efficiency of the gap between the dovetail block and the dovetail groove is improved. When the dovetail groove guide rail pair adopts the installation type of the dovetail groove upper dovetail block lower, the hexagon at the other end of the coarse adjustment nut can be twisted with a wrench until the inclined surface of the wedge block at one end of the piston is tightly fitted with the side of the dovetail groove, and then the fine adjustment hand wheel is manually rotated to further perform fine adjustment. Since the rotating shaft screw and the piston rod threaded end are connected by fine pitch threads, the wedge block can only move slightly, so that the required sliding friction can be achieved more conveniently and accurately, ensuring that the dovetail block can move without hysteresis in the dovetail groove and will not fall off.

[0017] Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 yes Figure 1 AA section view;

[0020] Figure 3 yes Figure 1 BB cross-sectional view;

[0021] Figure 4 yes Figure 1 CC section view;

[0022] Figure 5 yes Figure 1 Enlarged view of part I. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] In the description of the present invention, terms indicating directions such as "up", "down", "left", "right", "front", and "back" are based on the directions shown in the drawings, or are only for simplifying the description, rather than indicating or implying that the present invention must have a specific direction.

[0025] like Figure 1 As shown, the installation type of the dovetail groove guide pair of this embodiment is the type of dovetail groove body 10 on the dovetail block 20 below. The present invention can also be used for the installation type of dovetail block 20 on the dovetail groove body 10 below.

[0026] like Figure 1 to Figure 5 As shown, this embodiment includes a piston mechanism 1, a rotating shaft 2, a coarse adjustment nut 3 and a fine adjustment hand wheel 4 installed inside and outside one side of a dovetail groove body 20. The piston mechanism 1 includes a piston 11, a butterfly spring group 12 and a round nut 13. The piston 11 is a combination of a wedge block 111 and a cylinder. The inclination of the outer inclined surface of the wedge block 111 matches the inclined surface of the dovetail groove 201. A cylindrical piston rod 112 extends outward from the center of the inner vertical surface of the wedge block 111. The upper and lower sides of the wedge block 111 are embedded Figure 1In the through straight groove 203 in the middle of the right side of the middle dovetail groove 201, the piston rod 112 crosses through the through hole 202 that passes through the side of the dovetail groove body 20, and the butterfly spring group 12 sleeved on the piston rod 112 is embedded in the dovetail groove countersunk hole 204 on the outside of the dovetail groove body 20, and the butterfly spring group 12 is positioned in the dovetail groove countersunk hole 204 by the round nut 13 screwed on the threaded end of the piston rod 112, and the outside of the dovetail groove body 10 is also welded to the left end of the threaded cylinder 101. The left end of the rotating shaft 2 is threadedly connected with the end of the piston rod 112, and the right end of the rotating shaft 2 passes through the coarse adjustment nut 3 and the fine adjustment hand wheel 4 in turn, and is fixed in the fine adjustment hand wheel countersunk hole 41 at the right end of the fine adjustment hand wheel 4 by the fastening nut 14.

[0027] The coarse adjustment nut 3 and the fine adjustment hand wheel 4 are both stepped shaft structures, the left end of the coarse adjustment nut 3 is an external threaded rod 31, the right end is a hexagonal body 32, and the external threaded rod 31 is screwed into the threaded barrel 101. The small end shaft 43 of the fine adjustment hand wheel extends into the rear countersunk hole 34 at the right end of the coarse adjustment nut 3. The outer peripheral surface of the fine adjustment hand wheel 4 is rolled with a mesh pattern 42.

[0028] A circular plate 21 extends radially from the left end of the rotating shaft 2, and the circular plate 21 is embedded in the front countersunk hole 33 at the left end of the coarse adjustment nut 3. A rotating shaft screw 22 extends axially from the center of the circular plate 21, and the rotating shaft screw 22 is screwed into the threaded hole 113 at the end of the piston rod 112. The middle part of the rotating shaft 2 is a round rod 23 and a square rod 24 connected to each other. The round rod 23 passes through the central circular hole 34 of the coarse adjustment nut, and the square rod 24 passes through the central square hole 42 of the fine adjustment handwheel. The screw 25 at the end of the square rod is fixedly connected to the fastening nut 14 in the countersunk hole 41 of the fine adjustment handwheel.

[0029] In order to reduce the rotational resistance of the coarse-adjustment nut 3 and the fine-adjustment handwheel 4, a front annular groove 331 is respectively provided between the circular plate 21 and the bottom of the front countersunk hole 33 of the coarse-adjustment nut 3, and a rear annular groove 332 is respectively provided between the end face of the small-end shaft 43 of the fine-adjustment handwheel and the rear countersunk hole 33 at the right end of the coarse-adjustment nut 3. The curvature of the front annular groove and the curvature of the rear annular groove are respectively consistent with the curvature of the steel ball, and a plurality of steel balls 5 formed in a circle are respectively located in the front annular groove 331 and the rear annular groove 332.

[0030] The thread of the rotating shaft screw 22 is a fine pitch thread, and the external thread of the external thread rod 31 of the coarse adjustment nut 3 is a coarse pitch thread. The pitch of the fine pitch thread of the rotating shaft screw 22 of this embodiment is 0.75 mm, and the coarse pitch thread specification of the external thread rod 31 is M40, and its pitch is 3 mm; the pitch ratio of the coarse pitch thread to the fine pitch thread is 4. Such a structure facilitates rapid coarse adjustment and fine fine adjustment of the movement of the piston 11 to achieve the gap between the dovetail block 10 and the dovetail groove 201 required for fine adjustment.

[0031] A method for installing and adjusting a dovetail groove guide rail anti-loosening device, comprising the following steps:

[0032] 1) Install the piston mechanism 1, and let the piston rod 112 at the right end of the piston 11 pass through the through hole 202 that passes through the side of the dovetail groove 201, so that the upper and lower sides of the wedge block 111 at the left end of the piston 11 are embedded in the through straight groove 203 located on the right side of the dovetail groove 201. Then, the butterfly spring group 12 is sleeved on the piston rod 112, and the butterfly spring group 12 passes through the inner hole of the threaded cylinder 101 and is embedded in the dovetail groove countersunk hole 204 on the outside of the dovetail groove 201, and the round nut 13 is screwed on the threaded end of the piston rod 112.

[0033] 2) Install the coarse adjustment nut 3 and the rotating shaft 2 in sequence. First, apply grease to the front annular groove 331 at the bottom of the front countersunk hole 33 of the coarse adjustment nut 3 and put a circle of multiple steel balls 5. Then, pass the right end of the rotating shaft 2 through the central circular hole 34 of the coarse adjustment nut, so that the circular plate 21 of the rotating shaft 2 is embedded in the front countersunk hole 33 of the coarse adjustment nut 3. The front annular groove 331 of the circular plate 21 and the front annular groove 331 at the bottom of the front countersunk hole 33 of the coarse adjustment nut 3 are respectively against the two sides of the circle of multiple steel balls 5. Then, screw the external threaded rod 31 of the coarse adjustment nut 3 into the threaded barrel 101, so that the rotating shaft screw rod 22 is aligned with the central threaded hole 113 of the threaded end of the piston rod 112.

[0034] 3) Install the fine-tuning handwheel 4. First, apply grease to the rear annular groove 322 on the end face of the small end shaft 43 of the fine-tuning handwheel and put a circle of multiple steel balls 5. Then, put the central square hole 42 of the fine-tuning handwheel on the square rod 24 of the rotating shaft 2. The two sides of the circle of multiple steel balls 5 are respectively against the rear annular groove 322 of the rear countersunk hole 34 on the right end of the coarse adjustment nut 3 and the rear annular groove 322 on the end face of the small end shaft 43 of the fine-tuning handwheel. Then, put the washer 15 on the square rod end screw 25 that passes through the fine-tuning handwheel countersunk hole 41 on the right end of the fine-tuning handwheel 4, and then screw on the nut 14. Then, turn the fine-tuning handwheel 4 clockwise, drive the square rod 24 to rotate through the central square hole of the fine-tuning handwheel, and screw the rotating shaft screw 22 into the central threaded hole 113 of the threaded end of the piston rod 112. Continue to turn the fine-tuning handwheel 4 clockwise until the fine-tuning handwheel 4 cannot be turned. Then rotate the fine-tuning hand wheel 4 counterclockwise, and determine the number of rotations of the fine-pitch thread of the rotating shaft screw 22, so that the distance L3 between the end face of the external threaded rod 31 at the right end of the coarse-adjusting nut 3 and the end face of the threaded end of the piston rod 112 is 5 mm.

[0035] 4) After the gap adjustment between the dovetail block 10 and the dovetail groove 201 is completed, the hexagonal body 32 at the right end of the coarse adjustment nut 3 is turned clockwise with a wrench, and the external threaded rod 31 of the coarse adjustment nut 3 is screwed into the threaded barrel 101. The coarse adjustment nut 3 pushes the wedge block 111 of the piston 11 toward the inclined surface of the right side of the dovetail block 10 through the rotating shaft screw 22 at the left end of the rotating shaft 2, until the exposed length L2 of the external threaded rod 31 of the coarse adjustment nut 3 meets the requirements. Then, the fine adjustment hand wheel 4 is turned counterclockwise, and the rotating shaft 2 rotates counterclockwise to push the piston rod 112 to overcome the elastic force of the butterfly spring group 12 and move toward the side of the adjacent dovetail block 10, and the gap L1 between the inclined surface of the wedge block 111 and the inclined surface of the dovetail block 10 is reduced. Use a feeler gauge to check if the gap L1 meets the requirements; when the fine-tuning hand wheel 4 is turned clockwise, the rotating shaft 2 rotates clockwise to push the piston rod 112 to move away from the dovetail groove 201, and the gap L1 between the inclined surface of the wedge block 111 and the inclined surface of the dovetail block 10 increases. L2 ≥ L1 + 10mm.

[0036] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A dovetail groove guide rail anti-loosening device, characterized in that: The invention comprises a piston mechanism, a rotating shaft, a coarse adjustment nut and a fine adjustment hand wheel installed inside and outside one side of a dovetail groove body, the piston mechanism comprises a piston, a butterfly spring group and a round nut, the piston is a combination of a wedge block and a cylinder, the inclination of the outer inclined surface of the wedge block matches the inclined surface of the dovetail groove, a cylindrical piston rod extends outward from the center of the vertical surface inside the wedge block, the upper and lower sides of the wedge block are embedded in the through straight groove in the middle of one side of the dovetail groove, the piston rod passes horizontally through the through hole that passes through the side of the dovetail groove body, the butterfly spring group sleeved on the piston rod is embedded in the dovetail groove countersunk hole on the outer side of the dovetail groove body, and the butterfly spring group is positioned in the dovetail groove countersunk hole by screwing on the round nut screwed on the threaded end of the piston rod, and the outer side of the dovetail groove body is also welded to one end of the threaded barrel; one end of the rotating shaft is threadedly connected to the end of the piston rod, and the other end of the rotating shaft passes through the coarse adjustment nut and the fine adjustment hand wheel in turn, and is fixed in the fine adjustment hand wheel countersunk hole at one end of the fine adjustment hand wheel by tightening the nut; The coarse-adjustment nut and the fine-adjustment handwheel are both stepped shaft structures, one end of the coarse-adjustment nut is an externally threaded rod, and the other end is a hexagon, the externally threaded rod is screwed into the threaded barrel; the small-end shaft of the fine-adjustment handwheel extends into the rear countersunk hole at the other end of the coarse-adjustment nut; a circular plate radially extends from one end of the rotating shaft, the circular plate is embedded in the front countersunk hole at one end of the coarse-adjustment nut, and a rotating shaft screw extends axially from the center of the circular plate, and the rotating shaft screw is screwed into the threaded hole at the end of the piston rod; the middle part of the rotating shaft is a round rod and a square rod connected to each other, the round rod passes through the central circular hole of the coarse-adjustment nut, the square rod passes through the central square hole of the fine-adjustment handwheel, and the screw at the end of the square rod is fixedly connected to the fastening nut in the countersunk hole at the other end of the fine-adjustment handwheel; A front ring groove is provided between the circular plate and the bottom of the front countersunk hole of the coarse adjustment nut, and a rear ring groove is provided between the end face of the small end shaft of the fine adjustment hand wheel and the rear countersunk hole at the other end of the coarse adjustment nut. The curvature of the front ring groove and the curvature of the rear ring groove are respectively consistent with the curvature of the steel ball, and a plurality of steel balls forming a circle are respectively located in the front ring groove and the rear ring groove; The screw thread of the rotating shaft is a fine pitch thread, and the external thread of the external thread rod of the coarse adjustment nut is a coarse pitch thread; the pitch ratio of the coarse pitch thread to the fine pitch thread is 3-4.

2. A method for installing and adjusting the dovetail groove guide rail anti-loosening device according to claim 1, characterized in that: The following steps are involved: 1) Install the piston mechanism, and pass the piston rod at the other end of the piston horizontally through the through hole that penetrates the side of the dovetail groove, so that the upper and lower sides of the wedge block at one end of the piston are embedded in the through straight groove positioned on one side of the dovetail groove; then put the butterfly spring assembly on the piston rod, and the butterfly spring assembly passes through the inner hole of the threaded barrel and is embedded in the dovetail groove countersunk hole on the outside of the dovetail groove, and the round nut is screwed on the threaded end of the piston rod; 2) Install the coarse adjustment nut and the rotating shaft in sequence. First, apply grease to the front ring groove at the bottom of the front countersunk hole of the coarse adjustment nut and put a circle of multiple steel balls in it. Then, pass one end of the rotating shaft through the central circular hole of the coarse adjustment nut, so that the circular plate of the rotating shaft is embedded in the front countersunk hole of the coarse adjustment nut. The front ring groove of the circular plate and the front ring groove at the bottom of the front countersunk hole of the coarse adjustment nut are respectively against the two sides of the circle of multiple steel balls. Then, screw the external threaded rod of the coarse adjustment nut into the threaded barrel so that the rotating shaft screw is aligned with the central threaded hole of the threaded end of the piston rod. 3) Install the fine-tuning handwheel. First, apply grease to the rear ring groove on the end face of the small end shaft of the fine-tuning handwheel and put in a circle of multiple steel balls. Then, put the center square hole of the fine-tuning handwheel on the square rod of the rotating shaft, and the two sides of the circle of multiple steel balls respectively abut against the rear ring groove of the rear countersunk hole at the other end of the coarse-adjusting nut and the rear ring groove on the end face of the small end shaft of the fine-tuning handwheel; then, put a washer on the square rod end screw that passes through the fine-tuning handwheel countersunk hole at the other end of the fine-tuning handwheel, and then screw on the nut; then, turn the fine-tuning handwheel clockwise to drive the square rod to rotate through the center square hole of the fine-tuning handwheel, and screw the rotating shaft screw into the center threaded hole of the threaded end of the piston rod; continue to turn the fine-tuning handwheel clockwise until the fine-tuning handwheel cannot be turned; then turn the fine-tuning handwheel counterclockwise to determine the number of rotations of the fine-tuning handwheel according to the fine-pitch thread pitch of the rotating shaft screw, so that the distance L3 between the end face of the external threaded rod at one end of the coarse-adjusting nut and the end face of the threaded end of the piston rod is 5mm; 4) After the gap between the dovetail block and the dovetail groove is adjusted, use a wrench to turn the hexagonal body at the other end of the coarse adjustment nut clockwise, and the external threaded rod of the coarse adjustment nut is screwed into the threaded barrel. The coarse adjustment nut pushes the wedge block of the piston to move toward the inclined surface of one side of the dovetail block through the shaft screw at one end of the shaft, until the exposed length L2 of the external threaded rod of the coarse adjustment nut meets the requirement; then turn the fine adjustment handwheel counterclockwise, and the shaft rotates counterclockwise to push the threaded end of the piston rod to overcome the elastic force of the butterfly spring group and move toward the side of the adjacent dovetail block, and the gap L1 between the inclined surface of the wedge block and the inclined surface of the dovetail block is reduced; use a feeler gauge to check that the gap L1 meets the requirement; When the fine-tuning hand wheel is turned clockwise, the rotating shaft rotates clockwise to push the threaded end of the piston rod to move away from the dovetail groove, and the gap L1 between the inclined surface of the wedge block and the inclined surface of the dovetail block increases.

3. The installation and adjustment method of the dovetail groove guide rail anti-loosening device according to claim 2, characterized in that: In the step 4), L2≥L1+10mm.

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