CN116538193B - Linear ball guide cylinder and assembly method thereof - Google Patents

Abstract

The invention provides a linear ball guide cylinder and an assembly method thereof, and relates to the technical field of transmission guide devices. The linear ball guide cylinder includes a guide cylinder body, a retainer, balls and a guide cylinder end cover; a first arc-shaped groove is also provided on the inside of both ends of the guide cylinder body, and a third arc-shaped groove is provided at one end of the first arc groove close to the guide cylinder end cover. An L-shaped groove, and a second arc-shaped groove is provided inside the ends of the two guide cylinder end covers. The second arc-shaped groove is provided with a second L-shaped groove at one end close to the guide cylinder body. The two guide cylinder ends The covers are threadedly connected to both ends of the guide cylinder body, and the first arc-shaped groove and the second arc-shaped groove are combined to form a C-shaped groove, and the first L-shaped groove and the second L-shaped groove are combined to form a U-shaped groove. , the cage is provided with evenly spaced ball grooves, and the balls are assembled in the ball grooves and located in the C-shaped groove. The linear ball guide barrel has reasonable design, easy manufacturing and processing, and guaranteed accuracy. There will be no jamming phenomenon between the balls, the movement is smooth and not easy to fall off, and it is easy to disassemble and assemble.

Description

Linear ball guide cylinder and assembly method

Technical field

The present invention relates to the technical field of transmission guide devices, and specifically to a linear ball guide cylinder and an assembly method thereof.

Background technique

Linear guides are widely used in various industrial equipment and precision instruments. In order to ensure the transmission accuracy of the motion mechanism, a corresponding transmission guide device is often installed on the motion mechanism. A common guide device usually consists of a guide cylinder and a guide post, and the relative motion of the guide cylinder and the guide post is used to guide the motion mechanism.

For example, patent application CN105443697A discloses a linear ball guide bush with multiple arc-shaped rolling grooves on the rotating shaft to increase the rated load. However, the rolling groove of this device is located inside the bearing sleeve shell, making it difficult to manufacture and process, and difficult to ensure accuracy. Moreover, without using a retainer, the balls easily interfere with each other and become stuck, causing the balls to roll during motion. not fluent.

The linear ball guide bushes disclosed in the patent applications CN209164379U and CN207357953U have improved the problem of difficult processing of the rolling groove (i.e. ball channel) to a certain extent. However, it is not easy to install a retainer on the ball channel, causing the ball to break during movement. Stuck phenomenon.

Contents of the invention

The object of the present invention is to provide a linear ball guide cylinder and an assembly method thereof, which are reasonably designed, easy to manufacture and process, and can ensure accuracy. The balls will not get stuck between the balls, move smoothly, are not easy to fall off, and are easy to disassemble and assemble.

Embodiments of the present invention can be implemented as follows:

In a first aspect, the present invention provides a linear ball guide cylinder. The linear ball guide cylinder includes a guide cylinder body, a retainer, balls and a guide cylinder end cover;

Both ends of the guide barrel body are provided with external threads, and a first arc-shaped groove is provided on the inside of both ends of the guide barrel body. A first L-shaped groove is provided at one end of the first arc-shaped groove close to the end cover of the guide barrel. The ends of each guide cylinder end cap are provided with internal threads. A second arc-shaped groove is also provided inside the ends of the two guide cylinder end caps. A second L-shaped groove is provided at one end of the second arc-shaped groove close to the guide cylinder body. groove, the two guide barrel end caps are threadedly connected to both ends of the guide barrel body, and the first arc-shaped groove and the second arc-shaped groove are combined to form a C-shaped groove, so that the first L-shaped groove and the second L-shaped groove are The combination of grooves forms a U-shaped groove. The openings of the C-shaped groove and the U-shaped groove are all facing the center line of the guide barrel body. The retainer is a plum blossom-shaped annular structure. The retainer is provided with evenly spaced ball grooves. The balls are assembled on In the ball groove and located in the C-shaped groove.

The beneficial effects of the linear ball guide provided by the embodiment of the present invention include:

1. The L-shaped groove that accommodates the retainer and the arc-shaped groove that accommodates the balls are both located at the end of the guide barrel body and/or the guide barrel end cover, and neither the L-shaped groove nor the arc-shaped groove is along the guide barrel. The body extends in the length direction, but in a plane perpendicular to the length direction. When forming these grooves, you only need to hold the workpiece and control the tool to move around in the horizontal plane to complete the formation of a groove. Design Reasonable, easy to manufacture and process, and accuracy can be guaranteed;

2. A U-shaped groove is provided at the bottom of the C-shaped groove, and a retainer is loaded in the U-shaped groove. The cage is provided with evenly spaced ball grooves, and then the balls are assembled in the ball groove and located in the C-shaped groove. It can stabilize the relative position between the balls, and the balls will not get stuck, move smoothly and are not easy to fall off;

3. The retainer and the balls are relatively clamped between the guide cylinder body and the guide cylinder end cover, making it easy to disassemble and assemble.

In an optional embodiment, the first L-shaped groove and the second L-shaped groove are both annular and coaxial with the inner wall of the guide barrel of the guide barrel body, and there is a gap between the retainer and the U-shaped groove. dynamic coordination.

In this way, the friction force of the cage in the U-shaped groove is reduced, making it easier for the cage to rotate with the ball in the U-shaped groove.

In an optional embodiment, the guide cylinder end cover is further provided with a locking hole on the end surface away from the guide cylinder body, and the locking hole is used for inserting a circlip plier to tighten the guide cylinder end cover.

In this way, it is convenient to use the locking hole to tighten the guide cylinder end cover on the guide cylinder body, which improves assembly accuracy and facilitates disassembly.

In an optional embodiment, the outer peripheral surface of the retainer is a wavy surface, so that the outer peripheral surface of the retainer forms spaced point contacts with the bottom surface of the U-shaped groove.

In this way, the retainer forms spaced point contacts with the bottom surface of the U-shaped groove, which greatly reduces the friction between the retainer and the bottom surface of the U-shaped groove. This not only facilitates the smooth movement of the balls, but also extends the service life of the components.

In an optional embodiment, the first arcuate groove, the second arcuate groove and the ball groove are all matched with the spherical surface of the ball.

In this way, it is helpful for the C-shaped groove and the ball groove to form stable support for the ball, and the C-shaped groove to form a smooth guide for the ball.

In an optional embodiment, the cross section of the C-shaped groove along the axial direction of the guide cylinder body is a first arc, the central angle a of the first arc is greater than 180°, and the opening width h1 of the C-shaped groove is smaller than the diameter D of the ball.

In this way, after the first arc-shaped groove and the second arc-shaped groove clamp the ball and form the C-shaped groove, the ball will not fall off from the opening of the C-shaped groove.

In an optional embodiment, the protruding height L of the ball relative to the inner wall of the guide sleeve of the guide sleeve body satisfies: 0<L<D/2.

The protruding height L of the ball meets the above range, which not only supports and guides the parts installed inside the guide barrel body, but also prevents the protruding height L from being too large, causing the ball to become larger in the C-shaped groove. Small, the risk of falling out of the C-shaped groove is too high.

In an optional embodiment, the cross section of the ball groove along the axial direction of the guide cylinder body is a second arc, and the diameter of the second arc is equal to the diameter of the first arc and the diameter of the ball.

In this way, the surface of the ball can closely fit the inner wall of the ball groove and the inner wall of the C-shaped groove, improving the smoothness and stability of the ball rotation.

In an optional embodiment, the cross section of the ball groove along the guide barrel body is a third arc, and the center angle c of the third arc satisfies: 90°≤c≤180°. The retainer is axially oriented along the guide barrel body. Thickness h2≤D/2.

Because the ball itself will not fall off from the C-shaped groove, there is no need to require the retainer to limit the ball falling off. It only needs to keep the relative position between the balls stable, which can reduce the wrapping range of the ball by the cage, which can be reduced to the ball groove. The central angle c satisfies: 90° ≤ c ≤ 180°, and the thickness of the retainer h2 ≤ D/2, simplifying the structure of the retainer, reducing production costs and manufacturing difficulty.

In a second aspect, the present invention provides an assembly method of a linear ball guide cylinder. The assembly method is applied to the linear ball guide cylinder of the aforementioned embodiment. The assembly method includes:

Step 1: Select any end of the guide tube body as the current assembly end, and place the guide tube body vertically so that the current assembly end is vertically upward;

Step 2: Place the retainer in the first L-shaped groove on the current assembly end in step 1;

Step 3: Place the balls in the ball grooves on the retainer in Step 2 to form a dynamic fit;

Step 4: Connect the internal threads on the guide barrel end cover with the external threads on the guide barrel body so that the second L-shaped groove on the guide barrel end cover forms a dynamic fit with the retainer;

Step 5: Rotate the guide barrel end cover to tighten the internal threads on it with the external threads on the guide barrel body, or tighten the guide barrel end cover with circlip pliers through the locking hole on the guide barrel end cover;

Step 6: Use the other end of the guide tube body as the current assembly end, and place the guide tube body vertically so that the current assembly end is vertically upward;

Step 7: Repeat steps 2 to 5 to complete the assembly of the other end of the guide barrel body.

In this way, based on the ingenious structure of the linear ball guide cylinder, the above-mentioned simple and efficient assembly method can be used, and the assembly accuracy is high.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and therefore do not It should be regarded as limiting the protection scope of the present invention. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic diagram of the assembly structure of a linear ball guide provided by an embodiment of the present invention;

Figure 2 is a schematic exploded view of the linear ball guide provided by an embodiment of the present invention;

Figure 3 is a schematic diagram of the full axial cross-sectional structure of the linear ball guide provided by the embodiment of the present invention;

Figure 4 is an enlarged view of part A in Figure 3;

Figure 5 is a schematic diagram of Figure 4 without the retainer and balls;

Figure 6 is a schematic top view of the guide cylinder body;

Figure 7 is a schematic diagram of the axial full cross-sectional structure of the guide cylinder body;

Figure 8 is a schematic structural diagram of the guide tube end cover from below;

Figure 9 is a schematic diagram of the axial full cross-sectional structure of the guide tube end cover;

Figure 10 is a top structural schematic diagram of the retainer;

FIG. 11 is a cross-sectional view along line A-A in FIG. 10 .

Icon: 100-Linear ball guide barrel; 1-Guide barrel body; 11-External thread; 12-First arc groove; 13-First L-shaped groove; 2-Guide barrel end cover; 21-Internal thread; 22 -Locking hole; 23-second arc groove; 24-second L-shaped groove; 3-C-shaped groove; 31-first arc; 4-U-shaped groove; 5-retainer; 51-ball groove ; 52-Second arc; 53-Third arc; 54-Fourth arc; 6-Ball.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, rather than all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Therefore, the following detailed description of the embodiments of the invention provided in the appended drawings is not intended to limit the scope of the claimed invention, but rather to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

It should be noted that similar reference numerals and letters represent similar items in the following figures, therefore, once an item is defined in one figure, it does not need further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. appear to indicate an orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, or It is the orientation or positional relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the invention and simplifying the description. It does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. , therefore cannot be construed as a limitation of the present invention.

In addition, if the terms "first", "second", etc. appear, they are only used to differentiate the description and shall not be understood as indicating or implying relative importance.

It should be noted that, as long as there is no conflict, the features in the embodiments of the present invention can be combined with each other.

Please refer to FIGS. 1 to 3 . This embodiment provides a linear ball guide cylinder 100 . The linear ball guide cylinder 100 includes a guide cylinder body 1 , a retainer 5 , balls 6 and a guide cylinder end cover 2 .

Among them, the guide cylinder body 1, the retainer 5, the balls 6 and the guide cylinder end cover 2 are all symmetrical structures. The inner diameter of the guide cylinder body 1 and the inner diameter of the guide cylinder end cover 2 are equal and coaxial. Both ends of the guide cylinder body 1 are provided with external threads 11, and the ends of the two guide cylinder end caps 2 are provided with internal threads 21. The two guide cylinder end caps 2 are threadedly connected to the two ends of the guide cylinder body 1 respectively.

The end face of the guide cylinder end cover 2 away from the guide cylinder body 1 is also provided with a locking hole 22 . The locking hole 22 is used for inserting a circlip pliers to tighten the guide cylinder end cap 2 . In this way, it is convenient to use the locking hole 22 to tighten the guide cylinder end cover 2 on the guide cylinder body 1, which improves assembly accuracy and facilitates disassembly.

Please refer to FIGS. 4 to 9 . First arc-shaped grooves 12 are also provided inside both ends of the guide cylinder body 1 . A first L-shaped groove 13 is provided at one end of the first arc-shaped groove 12 close to the guide cylinder end cover 2 .

A second arc-shaped groove 23 is also provided inside the ends of the two guide cylinder end covers 2 , and a second L-shaped groove 24 is provided at one end of the second arc-shaped groove 23 close to the guide cylinder body 1 .

The two guide cylinder end caps 2 are threadedly connected to both ends of the guide cylinder body 1, and the first arc groove 12 and the second arc groove 23 are combined to form a C-shaped groove 3, so that the first L-shaped groove 13 and The second L-shaped groove 24 is combined to form a U-shaped groove 4, and the openings of the C-shaped groove 3 and the U-shaped groove 4 are both facing the center line of the guide barrel body 1.

Please refer to Figures 4 and 5. The cross-section of the C-shaped groove 3 along the axial direction of the guide cylinder body 1 is a first arc 31. The central angle a of the first arc 31 is greater than 180°, and the opening width h1 of the C-shaped groove 3 is less than The diameter of ball 6 is D. In this way, after the first arc-shaped groove 12 and the second arc-shaped groove 23 clamp the ball 6 and form the C-shaped groove 3 , the ball 6 will not fall off from the opening of the C-shaped groove 3 .

The protruding height L of the ball 6 relative to the inner wall of the guide cylinder of the guide cylinder body 1 satisfies: 0<L<D/2. The protruding height L of the ball 6 meets the above range, which can not only support and guide the parts installed inside the guide barrel body, but also prevent the protruding height L from being too large, causing the ball 6 to be inside the C-shaped groove 3 The size is small and the risk of falling off from the C-shaped groove 3 is too high.

The first L-shaped groove 13 and the second L-shaped groove 24 are both annular and coaxial with the inner wall of the guide barrel of the guide barrel body 1. There is a dynamic fit between the retainer 5 and the U-shaped groove 4. . In this way, the friction force of the retainer 5 in the U-shaped groove 4 is reduced, which facilitates the rotation of the retainer 5 in the U-shaped groove 4 along with the ball 6 .

Please refer to Figure 10. The retainer 5 has a plum blossom-shaped annular structure. The retainer 5 is provided with evenly spaced ball grooves 51. The balls 6 are assembled in the ball grooves 51 and located in the C-shaped groove 3. In this way, a number of balls 6 are evenly spaced by the ball grooves 51 on the retainer 5, preventing the balls 6 from interfering with each other when rolling and causing stagnation. Moreover, the number of balls 6 is consistent with the ball grooves 51 on the retainer 5. quantity matches.

The first arc groove 12 , the second arc groove 23 and the ball groove 51 are all matched with the spherical surface of the ball 6 . In this way, the C-shaped groove 3 and the ball groove 51 stably support the ball 6, and the C-shaped groove 3 guides the ball 6 smoothly.

The outer peripheral surface of the retainer 5 is a wavy surface, so that the outer peripheral surface of the retainer 5 and the bottom surface of the U-shaped groove 4 form spaced point contacts. In this way, the retainer 5 and the bottom surface of the U-shaped groove 4 form spaced point contacts, which greatly reduces the friction between the retainer 5 and the bottom surface of the U-shaped groove 4, which not only facilitates the smooth movement of the ball 6, but also extends the Component life.

The cross section of the ball groove 51 along the guide cylinder body 1 is a third arc 53. The center angle c of the third arc 53 satisfies: 90°≤c≤180°, because the ball 6 itself will not fall off from the C-shaped groove 3. Therefore, there is no need to require the retainer 5 to restrict the balls 6 from falling off. It only needs to keep the relative position between the balls 6 stable, so that the wrapping range of the balls 6 by the retainer 5 can be reduced to the point where the central angle c of the ball groove 51 satisfies : 90°≤c≤180°, simplifying the structure of the retainer 5, reducing production costs and manufacturing difficulty, and also preventing the retainer 5 from protruding from the inner wall of the guide sleeve body 1 and causing scratches to the components in the guide sleeve body 1 hurt.

Please refer to Figure 11. The cross section of the ball groove 51 along the axial direction of the guide cylinder body 1 is a second arc 52. The outer surface of the bottom wall of the ball groove 51 is a fourth arc 54. The diameter of the second arc 52, the first The diameters of the arc 31 and the diameters of the balls 6 are both equal, and the fourth arc 54 and the second arc 52 are concentric arcs. In this way, the surface of the ball 6 can be in close contact with the inner wall of the ball groove 51 and the inner wall of the C-shaped groove 3, thereby improving the smoothness and stability of the rotation of the ball 6.

The thickness h2 ≤ D/2 of the retainer 5 along the axial direction of the guide cylinder body 1 simplifies the structure of the retainer 5 and reduces the production cost and manufacturing difficulty.

This embodiment provides an assembly method of the linear ball guide 100. The assembly method is applied to the linear ball guide 100 of the aforementioned embodiment. The assembly method includes:

Step 1: Select any end of the guide cylinder body 1 as the current assembly end, and place the guide cylinder body 1 vertically so that the current assembly end is vertically upward;

Step 2: Place the retainer 5 in the first L-shaped groove 13 on the current assembly end in step 1;

Step 3: Place the ball 6 in the ball groove 51 on the retainer 5 in step 2 to form a dynamic fit;

Step 4: Connect the internal thread 21 on the guide cylinder end cover 2 with the external thread 11 on the guide cylinder body 1 so that the second L-shaped groove 24 on the guide cylinder end cover 2 and the retainer 5 form a dynamic connection. Cooperate;

Step 5: Rotate the guide cylinder end cap 2 to tighten the internal thread 21 on it with the external thread 11 on the guide cylinder body 1, or tighten the guide cylinder end with a circlip plier through the locking hole 22 on the guide cylinder end cap 2 Cover 2;

Step 6: Use the other end of the guide tube body 1 as the current assembly end, and place the guide tube body 1 vertically so that the current assembly end is vertically upward;

Step 7: Repeat steps 2 to 5 to complete the assembly of the other end of the guide tube body 1.

The beneficial effects of the linear ball guide 100 and its assembly method provided by this embodiment include:

1. The L-shaped groove for accommodating the retainer 5 and the arc-shaped groove for accommodating the balls 6 are both provided at the end of the guide cylinder body 1 and/or the guide cylinder end cover 2, and both the L-shaped groove and the arc-shaped groove are It does not extend along the length direction of the guide cylinder body 1, but in a plane perpendicular to the length direction. When processing to form these grooves, you only need to clamp the workpiece and control the tool to move around in the horizontal plane to complete a The forming of the groove is reasonably designed, easy to manufacture and process, and the accuracy can be guaranteed;

2. A U-shaped groove 4 is provided at the bottom of the C-shaped groove 3. A retainer 5 is loaded in the U-shaped groove 4. The retainer 5 is provided with evenly spaced ball grooves 51, and then the balls 6 are assembled in the ball grooves 51. , and is located in the C-shaped groove 3, which can stabilize the relative position between the balls 6. The balls 6 will not get stuck, move smoothly and are not easy to fall off;

3. The retainer 5 and the balls 6 are relatively clamped between the guide cylinder body 1 and the guide cylinder end cover 2, making it easy to disassemble and assemble.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily imagined by those skilled in the art within the technical scope disclosed by the present invention should be made. are covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. A linear ball guide, characterized in that the linear ball guide includes a guide body (1), a retainer (5), balls (6) and a guide end cover (2); Both ends of the guide barrel body (1) are provided with external threads (11), and a first arc-shaped groove (12) is also provided on the inside of both ends of the guide barrel body (1). A first L-shaped groove (13) is provided at one end of the groove (12) close to the guide cylinder end cover (2), and the ends of both guide cylinder end caps (2) are provided with internal threads (21) , a second arc-shaped groove (23) is also provided inside the ends of the two guide cylinder end covers (2), and the second arc-shaped groove (23) is provided close to one end of the guide cylinder body (1) There is a second L-shaped groove (24), and the two guide cylinder end caps (2) are threadedly connected to both ends of the guide cylinder body (1), and the first arc-shaped groove (12) Combined with the second arc-shaped groove (23) to form a C-shaped groove (3), the first L-shaped groove (13) and the second L-shaped groove (24) are combined to form a U-shaped groove ( 4), the openings of the C-shaped groove (3) and the U-shaped groove (4) are facing the center line of the guide barrel body (1), and the retainer (5) is a plum blossom-shaped annular structure, The retainer (5) is provided with evenly spaced ball grooves (51), and the balls (6) are assembled in the ball grooves (51) and located in the C-shaped groove (3). 2. The linear ball guide cylinder according to claim 1, characterized in that the first L-shaped groove (13) and the second L-shaped groove (24) are annular and are connected with the guide. The inner wall of the guide barrel of the barrel body (1) is coaxial, and a dynamic fit with clearance is used between the retainer (5) and the U-shaped groove (4). 3. The linear ball guide cylinder according to claim 1, characterized in that the guide cylinder end cover (2) is also provided with a locking hole (22) on the end surface away from the guide cylinder body (1), The locking hole (22) is used for inserting the circlip pliers to tighten the guide tube end cover (2). 4. The linear ball guide according to claim 1, characterized in that the outer peripheral surface of the retainer (5) is a wavy surface, so that the outer peripheral surface of the retainer (5) is in contact with the U-shaped groove. The bottom surface of (4) forms spaced point contacts. 5. The linear ball guide cylinder according to claim 1, characterized in that the first arc groove (12), the second arc groove (23) and the ball groove (51) are all connected with the The spherical surface of the ball (6) matches. 6. The linear ball guide cylinder according to claim 5, characterized in that the cross section of the C-shaped groove (3) along the axial direction of the guide cylinder body (1) is a first arc (31), and the The central angle a of the first arc (31) is greater than 180°, and the opening width h1 of the C-shaped groove (3) is smaller than the diameter D of the ball (6). 7. The linear ball guide cylinder according to claim 6, characterized in that the protruding height L of the ball (6) relative to the inner wall of the guide cylinder of the guide cylinder body (1) satisfies: 0<L<D /2. 8. The linear ball guide cylinder according to claim 6, characterized in that the cross section of the ball groove (51) along the axial direction of the guide cylinder body (1) is a second arc (52), and the second circular arc (52) is The diameters of the two arcs (52) are equal to the diameter of the first arc (31) and the diameter of the ball (6). 9. The linear ball guide according to claim 6, characterized in that the cross section of the ball groove (51) along the transverse direction of the guide body (1) is a third arc (53), and the third arc is The central angle c of the arc (53) satisfies: 90°≤c≤180°, and the thickness h2≤D/2 of the retainer (5) along the axial direction of the guide cylinder body (1). 10. An assembly method of a linear ball guide cylinder, characterized in that the assembly method is applied to the linear ball guide cylinder of claim 1, and the assembly method includes: Step 1: Select any end of the guide cylinder body (1) as the current assembly end, and place the guide cylinder body (1) vertically so that the current assembly end is vertically upward; Step 2: Place the retainer (5) in the first L-shaped groove (13) on the current assembly end in step 1; Step three: place the ball (6) in the ball groove (51) on the retainer (5) in step two to form a dynamic fit; Step 4: Connect the internal thread (21) on the guide barrel end cover (2) with the external thread (11) on the guide barrel body (1), so that the guide barrel end cover (2) ) on the second L-shaped groove (24) and the retainer (5) to form a dynamic fit; Step 5: Rotate the guide barrel end cap (2) to tighten the internal threads (21) on the guide barrel body (1) with the external threads (11) on the guide barrel body (1), or tighten the guide barrel end cap (2) ), use circlip pliers to tighten the guide tube end cover (2); Step 6: Use the other end of the guide tube body (1) as the current assembly end, and place the guide tube body (1) vertically so that the current assembly end is vertically upward; Step 7: Repeat steps 2 to 5 to complete the assembly of the other end of the guide tube body (1).