A locking sleeve mechanism

Abstract

The present invention relates to the technical field of shaft sleeves, and in particular to a locking shaft sleeve mechanism, comprising a shaft sleeve outer liner, a shaft sleeve inner liner being installed on the inner side of the shaft sleeve outer liner, and the shaft sleeve mechanism comprising a locking assembly module and an automatic adjustment module, the locking assembly module being used to limit the shaft sleeve inner liner and the clamping plate, so as to facilitate the stable installation of the shaft sleeve inner liner and the clamping plate inside the shaft sleeve outer liner, so that the shaft sleeve inner liner and the clamping plate are subjected to wear during operation, and by designing the automatic adjustment module to cooperate with the locking assembly module, several groups of air bags are connected, so that the air pressure in the air bags will not be disturbed by the slight movement of the clamping plate, so as to facilitate the stable installation of several groups of clamping plates, and when the clamping plate is subjected to a large vibration force or wear, a certain neutralization compensation can be performed on the wear position, so as to facilitate the correction of the position to avoid the aggravation of local wear, thereby greatly increasing the service life of the shaft sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of shaft sleeves, and in particular to a locking shaft sleeve mechanism. Background Art

[0002] The sleeve is equivalent to the outer ring of the sliding bearing. The sleeve is integral and moves relative to the shaft. When the engine shaft is moving, try not to let it deviate in direction due to vibration. At this time, the sleeve is needed to help fix it. The important role of the sleeve in the machinery is to fix the position. When the rotation of the machinery is relatively low and the clearance requirement is relatively high, the sleeve can be used to replace the rolling bearing for operation. The sleeve is wear-resistant and can be used for a long time, so it can help save costs to a large extent. The sleeve is mainly used in machinery, printing and dyeing, papermaking, chemical industry, aerospace, coal, petroleum, automobile, engineering machinery, metallurgy and other industries.

[0003] The sleeve and the engine shaft are constantly in friction during the process of supporting use, and will wear out over time, requiring replacement of the entire assembly. Most of the existing special wear-resistant materials are relatively precious, which increases material waste. In addition, when a structure of the shaft or sleeve is offset due to large vibrations or hard impacts, the rotation of the shaft relative to the sleeve will produce greater friction, which will cause greater wear on the inner wall of the sleeve. Friction and wear treatment is required to ensure the use effect of the sleeve and extend the service life of the sleeve.

[0004] Therefore, a locking sleeve mechanism is proposed. Summary of the invention

[0005] The object of the present invention is to provide a locking sleeve mechanism to solve the problems of inconvenient partial replacement and easy wear due to vibration force proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a locking sleeve mechanism, including a sleeve outer liner, a sleeve inner liner is installed on the inner side of the sleeve outer liner, the sleeve mechanism includes a locking assembly module and an automatic adjustment module, the locking assembly module is used to limit the sleeve inner liner and the clamping plate, so that the sleeve inner liner and the clamping plate are stably installed inside the sleeve outer liner, so that the sleeve inner liner and the clamping plate can withstand wear during operation, and the automatic adjustment module is used to cooperate with the locking assembly module to fine-tune the positions of several groups of clamping plates, which is convenient for several groups of clamping plates to clamp the shaft more tightly and for neutralizing the air pressure to compensate for the effects of wear.

[0007] Preferably, the locking assembly module includes an active cavity opened inside the two ends of the shaft sleeve outer lining, a movable plate is movably arranged inside the active cavity, a pressure rod is fixedly connected to the upper end of the movable plate, the upper end of the pressure rod passes through the shaft sleeve outer lining and is attached to the inner side of the ring, the ring is fixedly installed on the outer side of the shaft sleeve outer lining by screws, one end of the clamping column is fixedly connected to the bottom end of the active plate, the other end of the clamping column passes through the shaft sleeve outer lining and is clamped in the clamping column groove, and the clamping column groove is opened around the outer side of the shaft sleeve inner lining.

[0008] Preferably, the movable cavity and the movable plate are both arranged in a polygonal shape, and the movable cavity and the movable plate are adapted to each other.

[0009] Preferably, an inclined notch is formed at the outer end of the pressure rod, and the notch faces the outer end.

[0010] Preferably, a return spring is arranged between the bottom end of the movable cavity and the bottom end of the movable plate, and the return spring is sleeved on the outer side of the clamping column.

[0011] Preferably, a plurality of groups of slide grooves are evenly provided on the inner side of the shaft sleeve outer lining, a clamping plate is provided on the inner side of the slide groove, the clamping plate passes through the through hole and extends to the inner side of the shaft sleeve inner lining, the through holes are evenly provided on the outer side of the shaft sleeve inner lining, key grooves are provided on both ends of the outer side of the clamping plate, an airbag box is provided inside the key groove, an airbag and a push plate are arranged inside the airbag box, a pressure block is attached to the outer side of the push plate, and the pressure block is fixedly connected to the side of the movable plate.

[0012] Preferably, the pressing block is arranged in an L shape, the inner side of the pressing block passes through the airbag box and is attached to the push plate, and both the airbag and the push plate are adapted to the airbag box.

[0013] Preferably, the automatic adjustment module includes one end of a connector arranged on the airbag, the other end of the connector is clamped in the pressure block and connected to one end of the first gas delivery channel, the other end of the first gas delivery channel passes through the movable plate, the clamping column and the pressure block and is connected to the second gas delivery channel, the second gas delivery channel is opened on the clamping column, several groups of second gas delivery channels are connected in series in a ring shape through the third gas delivery channel, two groups of third gas delivery channels are connected together through two groups of fourth gas delivery channels, and the third gas delivery channel and the fourth gas delivery channel are both opened inside the outer lining of the sleeve.

[0014] Preferably, two groups of sealing rings are arranged on the outer side of the clamping column, and the two groups of sealing rings are respectively located on both sides of the second gas transmission channel.

[0015] Preferably, a circular groove is provided on the left side of the shaft sleeve outer lining, a debugging valve is provided inside the circular groove, the debugging valve is connected to the fourth air supply channel, and a sealing cover is provided on the outer side of the debugging valve.

[0016] Beneficial effects of the present invention:

[0017] 1. The present invention is conducive to the rapid disassembly and assembly of the shaft sleeve liner by designing a locking assembly module. It is not only convenient to replace the shaft sleeve liner that is easy to produce, but only needs to use rare materials at the shaft sleeve liner to reduce the use of rare materials. In addition, the clamping connection of the shaft sleeve liner is more stable than the existing threaded connection, which greatly increases the stability of the shaft sleeve liner during use. In addition, the process of fixing the shaft sleeve liner with the shaft sleeve outer liner is used to achieve preliminary limitation of the clamping plate, so that the clamping plate can be stably clamped on the shaft, which is convenient for replacing the local clamping plate, reduces material loss, and increases the convenience of replacement.

[0018] 2. The present invention designs an automatic adjustment module in conjunction with a locking assembly module, and connects several groups of airbags so that the air pressure in the airbags will not be disturbed by a slight movement of the clamping plate, thereby ensuring the stability of the installation of several groups of clamping plates. When the clamping plate is subjected to a large vibration force or wear, a certain neutralization compensation can be performed on the worn position, which is convenient for correcting the position to avoid aggravation of local wear, thereby greatly increasing the service life of the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is an overall three-dimensional schematic diagram of a locking sleeve mechanism according to an embodiment of the present invention;

[0021] Figure 2 The overall cross-sectional view of a locking sleeve mechanism according to an embodiment of the present invention is shown in FIG. Figure 1 ;

[0022] Figure 3 A locking sleeve mechanism according to an embodiment of the present invention Figure 2 The enlarged schematic diagram at A in the middle;

[0023] Figure 4 The overall cross-sectional view of a locking sleeve mechanism according to an embodiment of the present invention is shown in FIG. Figure 2 ;

[0024] Figure 5 The overall cross-sectional view of a locking sleeve mechanism according to an embodiment of the present invention is shown in FIG. Figure 3 ;

[0025] Figure 6 A partial three-dimensional schematic diagram of a locking sleeve mechanism according to an embodiment of the present invention Figure 1 ;

[0026] Figure 7A partial three-dimensional schematic diagram of a locking sleeve mechanism according to an embodiment of the present invention Figure 2 ;

[0027] Figure 8 A partial three-dimensional schematic diagram of a locking sleeve mechanism according to an embodiment of the present invention Figure 3 .

[0028] The markings in the figure are: 1. outer lining of the sleeve; 2. inner lining of the sleeve; 3. movable cavity; 4. movable plate; 5. pressure rod; 6. notch; 7. clamping column; 8. clamping column groove; 9. collar; 10. screw; 11. return spring; 12. slide groove; 13. through hole; 14. clamping plate; 15. keyway; 16. airbag box; 17. airbag; 18. push plate; 19. pressure block; 20. connector; 21. first air supply channel; 22. second air supply channel; 23. third air supply channel; 24. fourth air supply channel; 25. sealing ring; 26. circular groove; 27. debugging valve; 28. sealing cover. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] See also Figures 1 to 8 The present invention provides a technical solution: a locking sleeve mechanism, including a sleeve outer liner 1, a sleeve inner liner 2 is installed on the inner side of the sleeve outer liner 1, and the sleeve mechanism includes a locking assembly module and an automatic adjustment module. The locking assembly module is used to limit the sleeve inner liner 2 and the clamping plate 14, so that the sleeve inner liner 2 and the clamping plate 14 are stably installed inside the sleeve outer liner 1, so that the sleeve inner liner 2 and the clamping plate 14 can withstand wear during work. The automatic adjustment module is used to cooperate with the locking assembly module to fine-tune the positions of several groups of clamping plates 14, which is convenient for several groups of clamping plates 14 to clamp the shaft more tightly and to neutralize the air pressure to compensate for the effects of wear.

[0032] As an embodiment of the present invention, Figure 2 and Figure 3 as well as Figure 8 As shown, the locking assembly module includes an active cavity 3 opened inside the two ends of the shaft sleeve outer liner 1, and an active plate 4 is movably arranged inside the active cavity 3. The upper end of the active plate 4 is fixedly connected to a pressure rod 5, and the upper end of the pressure rod 5 passes through the shaft sleeve outer liner 1 and is attached to the inner side of a collar 9. The collar 9 is fixedly installed on the outer side of the shaft sleeve outer liner 1 by a screw 10. The bottom end of the active plate 4 is fixedly connected to one end of a clamping column 7, and the other end of the clamping column 7 passes through the shaft sleeve outer liner 1 and is clamped in the clamping column groove 8. The column groove 8 is provided around the outer side of the shaft sleeve inner liner 2, the movable cavity 3 and the movable plate 4 are both arranged in a polygonal shape, the movable cavity 3 and the movable plate 4 are adapted, the outer end of the pressure rod 5 is provided with an inclined notch 6, the notch 6 faces the outer end, and a return spring 11 is provided between the bottom end of the movable cavity 3 and the bottom end of the movable plate 4. The return spring 11 is sleeved on the outer side of the column 7. When in use, the shaft sleeve inner liner 2 is first inserted into the inner side of the shaft sleeve outer liner 1, and then the sleeve is sleeved on the shaft sleeve outer liner by screws 10. The outer side of the sleeve 1 is fixedly mounted on the sleeve outer liner 1, and the sleeve 9 presses the pressure rod 5 into the movable cavity 3 along the notch 6, and then the pressure rod 5 drives the clamping column 7 to clamp into the clamping column groove 8 on the outer side of the sleeve inner liner 2 through the movable plate 4, thereby fixing the sleeve inner liner 2 on the sleeve outer liner 1, and the inclined surface of the notch 6 will not rotate due to the polygonal setting of the movable cavity 3 and the movable plate 4. When disassembly is required, the screw 10 is turned to remove the sleeve 9 to release the fixed connection between the sleeve outer liner 1 and the sleeve 9, and then the restoring force of the reset spring 11 drives the movable plate 4 to move outward, and the movable plate 4 drives the clamping column 7 to disengage from the clamping column groove 8, thereby releasing the fixing of the sleeve outer liner 1 to the sleeve inner liner 2, which is conducive to the rapid disassembly and assembly of the sleeve inner liner 2, which is not only convenient for replacing the sleeve inner liner 2 that is easy to produce and reduces the loss of accessories, but also the clamping connection of the sleeve inner liner 2 is more stable than the existing threaded connection, which greatly increases the stability of the sleeve inner liner 2 when in use.

[0033] As an embodiment of the present invention, Figure 3 and Figure 7 as well as Figure 8As shown, a plurality of groups of slide grooves 12 are evenly provided on the inner side of the sleeve outer liner 1, and a clamping plate 14 is clamped on the inner side of the slide groove 12. The clamping plate 14 passes through the through hole 13 and extends to the inner side of the sleeve inner liner 2. The through hole 13 is evenly provided on the outer side of the sleeve inner liner 2. Key grooves 15 are provided on both ends of the outer side of the clamping plate 14. An airbag box 16 is clamped inside the key groove 15. An airbag 17 and a push plate 18 are provided inside the airbag box 16. A pressure block 19 is attached to the outer side of the push plate 18. The pressure block 19 is fixedly connected to the side of the movable plate 4. The pressure block 19 is L-shaped. The inner side of the pressure block 19 passes through the airbag box 16 and is attached to the push plate 18. The airbag 17 and the push plate 18 are The plates 18 are all compatible with the airbag box 16. First, several groups of clamping plates 14 are placed in several groups of slide grooves 12 opened on the inner side of the sleeve outer liner 1, and then the sleeve inner liner 2 is fixed, so that the movable plate 4 drives the pressure block 19 to move inward, and the pressure block 19 cooperates with the external shaft to press the clamping plate 14 through the airbag box 16, the airbag 17 and the push plate 18, so as to fix several groups of clamping plates 14, which is beneficial to the process of fixing the sleeve inner liner 2 with the sleeve outer liner 1, realizing the preliminary limitation of the clamping plate 14, so that the clamping plate 14 can be stably clamped on the shaft, which is convenient for replacing the local clamping plate 14, reducing the loss of material and increasing the convenience of replacement.

[0034] As an embodiment of the present invention, Figure 3 and Figure 4 as well as Figure 5As shown, the automatic adjustment module includes one end of a connector 20 arranged on the airbag 17, the other end of the connector 20 is clamped in the pressing block 19 and connected to one end of a first gas delivery channel 21, the other end of the first gas delivery channel 21 passes through the movable plate 4, the clamping column 7 and the pressing block 19 and is connected to the second gas delivery channel 22, the second gas delivery channel 22 is opened on the clamping column 7, a plurality of groups of second gas delivery channels 22 are connected in series in a ring shape through a third gas delivery channel 23, two groups of third gas delivery channels 23 are connected together through two groups of fourth gas delivery channels 24, and the third gas delivery channels 23 are connected in series in a ring shape. The air channel 23 and the fourth air delivery channel 24 are both opened inside the shaft sleeve outer liner 1. Two sets of sealing rings 25 are arranged on the outside of the clamping column 7. The two sets of sealing rings 25 are respectively located on both sides of the second air delivery channel 22. A circular groove 26 is opened on the left side of the shaft sleeve outer liner 1. A debugging valve 27 is arranged inside the circular groove 26. The debugging valve 27 is connected to the fourth air delivery channel 24. A sealing cover 28 is sleeved on the outside of the debugging valve 27. First, the shaft sleeve inner liner 2 and the clamping plate 14 are preliminarily fixed by locking the assembly module so that the two sets of sealing rings 25 are aligned. The second gas delivery channel 22 is sealed, so that the first gas delivery channel 21 connects the second gas delivery channel 22 and the third gas delivery channel 23, and then the two groups of third gas delivery channels 23 are connected through the fourth gas delivery channel 24, so that the inside of the several groups of air bags 17 are connected as a whole, and then the sealing cover 28 is removed, and the appropriate gas is filled from the debugging valve 27 to debug the air pressure, so that the internal air pressure of the several groups of air bags 17 is kept constant, so that the several groups of clamping plates 14 are stably clamped on the mechanical shaft, and finally when a group of clamping plates 14 is subjected to a large vibration force or When wear occurs, the air pressure in the corresponding airbag 17 of this group increases or decreases, and the air pressure in other groups of airbags 17 is neutralized and supplemented for this airbag 17, which is beneficial for the connection of several groups of airbags 17, so that the air pressure in the airbag 17 will not be disturbed by the slight movement of the clamping plate 14, which is convenient for ensuring the stable installation of several groups of clamping plates 14, and when the clamping plate 14 is subjected to a large vibration force or wear, a certain neutralization compensation can be performed on the worn position, which is convenient for correcting the position to avoid aggravation of local wear, thereby greatly increasing the service life of the sleeve.

[0035] Working principle: when in use, first insert the shaft sleeve liner 2 into the shaft sleeve outer liner 1, then fix the upper collar 9 sleeved on the outer side of the shaft sleeve outer liner 1 on the shaft sleeve outer liner 1 through the screw 10, then the collar 9 presses the pressure rod 5 into the movable cavity 3 along the notch 6, then the pressure rod 5 drives the clamping column 7 to be clamped into the clamping column groove 8 on the outer side of the shaft sleeve liner 2 through the movable plate 4, so that the shaft sleeve liner 2 is fixed on the shaft sleeve outer liner 1, and the inclined surface of the notch 6 will not rotate through the polygonal setting of the movable cavity 3 and the movable plate 4. When disassembly is required, the screw 10 is turned to remove the collar 9, and the fixed connection between the shaft sleeve outer liner 1 and the collar 9 is released, and then the restoring force of the reset spring 11 drives the movable plate 4 to move outward, and the movable plate 4 drives the clamping column 7 to disengage from the clamping column groove 8, thereby releasing the fixing of the shaft sleeve outer liner 1 to the shaft sleeve inner liner 2;

[0036] First, several groups of clamping plates 14 are placed in several groups of slide grooves 12 opened on the inner side of the shaft sleeve outer liner 1, and then the shaft sleeve inner liner 2 is fixed, so that the movable plate 4 drives the pressing block 19 to move inward, and the pressing block 19 cooperates with the external shaft to press the clamping plates 14 through the airbag box 16, the airbag 17 and the push plate 18, thereby fixing the several groups of clamping plates 14;

[0037] First, the sleeve liner 2 and the clamping plate 14 are preliminarily fixed by locking the assembly module, so that the two groups of sealing rings 25 seal the second gas supply channel 22, so that the first gas supply channel 21 connects the second gas supply channel 22 and the third gas supply channel 23, and then the two groups of third gas supply channels 23 are connected through the fourth gas supply channel 24, so that the interiors of the several groups of airbags 17 are connected as a whole, and then the sealing cover 28 is removed, and the appropriate gas is filled from the debugging valve 27 for air pressure debugging, so that the internal air pressure of the several groups of airbags 17 remains constant, so that the several groups of clamping plates 14 are stably clamped on the mechanical shaft, and finally when a group of clamping plates 14 is worn, the air pressure in the corresponding airbag 17 of this group drops, and the air pressure in other groups of airbags 17 is neutralized and supplemented for the airbag 17.

[0038] It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0039] The present invention is intended to cover all such substitutions, modifications and changes that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A locking sleeve mechanism, comprising a sleeve outer liner (1), a sleeve inner liner (2) being installed inside the sleeve outer liner (1), characterized in that: The sleeve mechanism includes a locking assembly module and an automatic adjustment module; The locking assembly module is used to restrict the shaft sleeve liner (2) and the clamping plate (14), so as to facilitate the shaft sleeve liner (2) and the clamping plate (14) to be stably installed inside the shaft sleeve outer liner (1), so that the shaft sleeve liner (2) and the clamping plate (14) can withstand wear during operation; The automatic adjustment module is used to cooperate with the locking assembly module to fine-tune the positions of the plurality of clamping plates (14), so that the plurality of clamping plates (14) can clamp the shaft more tightly and neutralize the air pressure; The inner side of the shaft sleeve outer lining (1) is evenly provided with a plurality of groups of slide grooves (12), the inner side of the slide grooves (12) is provided with a clamping plate (14), the clamping plate (14) passes through the through hole (13) and extends to the inner side of the shaft sleeve inner lining (2), the through hole (13) is evenly provided on the outer side of the shaft sleeve inner lining (2), the outer ends of the clamping plate (14) are provided with key grooves (15), the inner side of the key grooves (15) is provided with an airbag box (16), the inner side of the airbag box (16) is provided with an airbag (17) and a push plate (18), and the plurality of groups of airbags (17) are connected, the outer side of the push plate (18) is provided with a pressure block (19), and the pressure block (19) is fixedly connected to the side of the movable plate (4); The pressing block (19) is arranged in an L shape, the inner side of the pressing block (19) passes through the airbag box (16) and is attached to the push plate (18), and the airbag (17) and the push plate (18) are both compatible with the airbag box (16).

2. A locking sleeve mechanism according to claim 1, characterized in that: The locking assembly module comprises an active cavity (3) opened inside the two ends of the shaft sleeve outer liner (1), a movable plate (4) is movably arranged inside the active cavity (3), a pressure rod (5) is fixedly connected to the upper end of the active plate (4), the upper end of the pressure rod (5) passes through the shaft sleeve outer liner (1) and is attached to the inner side of a collar (9), the collar (9) is fixedly mounted on the outer side of the shaft sleeve outer liner (1) by means of screws (10), one end of a clamping column (7) is fixedly connected to the bottom end of the active plate (4), the other end of the clamping column (7) passes through the shaft sleeve outer liner (1) and is clamped in a clamping column groove (8), and the clamping column groove (8) is opened around the outer side of the shaft sleeve inner liner (2).

3. A locking sleeve mechanism according to claim 2, characterized in that: The movable cavity (3) and the movable plate (4) are both arranged in a polygonal shape, and the movable cavity (3) and the movable plate (4) are adapted to each other.

4. A locking sleeve mechanism according to claim 2, characterized in that: An inclined notch (6) is provided at the outer end of the pressure rod (5), and the notch (6) faces the outer end.

5. A locking sleeve mechanism according to claim 2, characterized in that: A return spring (11) is provided between the bottom end of the movable cavity (3) and the bottom end of the movable plate (4), and the return spring (11) is sleeved on the outside of the clamping column (7).

6. A locking sleeve mechanism according to claim 1, characterized in that: The automatic adjustment module comprises one end of a connector (20) arranged on the airbag (17); the other end of the connector (20) is clamped in the pressing block (19) and connected to a first gas delivery channel (21); the first gas delivery channel (21) passes through the movable plate (4), the clamping column (7) and the pressing block (19) and is connected to a second gas delivery channel (22); a plurality of groups of the second gas delivery channels (22) are connected in series in a ring shape through a third gas delivery channel (23); and the third gas delivery channels (23) are connected through a fourth gas delivery channel (24).

7. A locking sleeve mechanism according to claim 6, characterized in that: Two groups of sealing rings (25) are arranged on the outer side of the clamping column (7), and the two groups of sealing rings (25) are respectively located on both sides of the second gas transmission channel (22).

8. A locking sleeve mechanism according to claim 6, characterized in that: A circular groove (26) is provided on the left side of the shaft sleeve outer lining (1), a debugging valve (27) is provided inside the circular groove (26), the debugging valve (27) is connected to a fourth air supply channel (24), and a sealing cover (28) is sleeved on the outer side of the debugging valve (27).

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