Tailstock spindle self-unlocking structure

Abstract

The utility model discloses a tailstock spindle self-unlocking structure, which relates to the technical field of lathe tailstocks and comprises a tailstock body, a tailstock spindle is mounted in the tailstock body, a locking hole is mounted on the tailstock body, a locking threaded part, an upper locking block and a lower locking block are mounted in the locking hole, and the upper locking block and the lower locking block movably abut against the tailstock spindle. The locking threaded part comprises a long-shaft screw rod, and a locking handle seat is in threaded connection with the long-shaft screw rod and located at the outer end of the locking hole; the bottom of the long-shaft screw rod is in threaded connection with the lower locking block, an annular notch I is formed in the long-shaft screw rod, and a locking key is mounted in the annular notch I; a mounting opening is formed in the upper locking block and connected with the locking key in a clamped mode. A tailstock lower sealing plate is installed at the bottom of the locking hole and closes the bottom end of the locking hole. The technical problems that the surface of the sleeve is directly extruded downwards from one side, slipping is prone to occurring after long-term use, and long-term locking use cannot be achieved are solved.

Description

Technical Field

[0001] This utility model relates to the field of lathe tailstock technology, specifically a tailstock spindle self-unlocking structure. Background Technology

[0002] The tailstock plays several important roles in lathe machining. First, its primary function is to support the workpiece, ensuring its stable rotation during machining. By adjusting the tailstock ram and tailstock base, the height and horizontal position of the workpiece can be precisely controlled, thus guaranteeing its stability during rotation. Furthermore, the tailstock can also position the workpiece, maintaining its position and orientation throughout the machining process, which is particularly important for high-precision machining.

[0003] When machining long shaft products on a CNC lathe, mounting and fixing them on the lathe guide rails serves to support and secure the parts, providing a certain degree of safety and convenience, and improving machining performance.

[0004] Existing tailstock structures typically include components such as a base, main shaft, slide, tailstock seat, center frame, and tailstock rod. Their internal structure is complex and needs to withstand significant axial loads.

[0005] Currently, the movement of the tailstock spindle along the transverse machining of the machine tool is achieved by using a lead screw to drive the spindle; Reference CN201920049049.4 A tailstock for easy installation of a lathe uses a locking handle threaded drive to lower the locking block to lock the sleeve; usually, for the sleeve installed in the seat, lubricating oil needs to be injected to maintain the long-term reciprocating pushing effect, while the locking method of directly pressing the sleeve surface downward from one side is prone to slippage after long-term use and cannot be locked for long-term use.

[0006] To address this issue, we provide a tailstock spindle self-unlocking structure. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a tailstock main shaft self-unlocking structure, including a tailstock body, an installation cavity is provided on the tailstock body, a tailstock screw is installed in the installation cavity, a tailstock closure is installed at the end of the tailstock screw, the tailstock closure is connected to the tailstock body, and a corrugated handwheel is installed on the side opposite to the tailstock screw.

[0008] A main shaft nut seat is installed on the tailstock screw, and the tailstock main shaft is installed on the side of the main shaft nut seat facing away from the tailstock enclosure. The tailstock main shaft is cylindrical.

[0009] The tailstock body is equipped with a locking hole, and a locking threaded part, an upper locking block and a lower locking block are installed in the locking hole. The bottom of the upper locking block is provided with an upper notch on the side opposite to the tailstock main shaft, and the top of the lower locking block is provided with a lower notch on the side opposite to the tailstock main shaft. The upper notch and the lower notch are adapted to movably abut against the tailstock main shaft.

[0010] The locking threaded component includes a long shaft screw, on which a locking handle seat is threadedly connected and located at the outer end of the locking hole; the bottom of the long shaft screw is threadedly connected to a lower locking block, and an annular notch is provided on the long shaft screw, within which a locking key is installed; an installation port is provided in the upper locking block, and the installation port engages with the locking key; the vertical dimension of the annular notch is greater than the vertical height of the locking key; a tailstock lower sealing plate is installed at the bottom of the locking hole, and the tailstock lower sealing plate closes the bottom end of the locking hole.

[0011] In a further technical solution, a stepped hole is provided in the middle of the upper locking block; a large diameter section one and a large diameter section two are integrally provided on the long shaft screw, the outer diameter of the large diameter section one and the large diameter section two are the same and are arranged in parallel; an annular notch one is provided between the large diameter section one and the large diameter section two; the large diameter section one is located on the upper side of the large diameter section two.

[0012] The second large-diameter section is located at the bottom of the first large-diameter section and movably abuts against the step surface.

[0013] In a further technical solution, an adjusting shim is installed on the long shaft screw, and the outer diameter of the adjusting shim is adapted to the inner diameter of the locking hole; an annular notch is provided at the top of the large diameter part one, and the annular notch two is suitable for engaging the adjusting shim.

[0014] In a further technical solution, the tailstock enclosure includes a tailstock indexing plate and a tailstock rear cover, the tailstock rear cover being detachably connected to the tailstock body; the tailstock indexing plate is installed on the side of the tailstock rear cover facing away from the tailstock body, and the tailstock rear cover has a central hole and is sleeved on the tailstock screw; the tailstock indexing plate is fixedly connected to the tailstock screw.

[0015] In a further technical solution, the corrugated handwheel is type B and has a handle installed. A rotating lever is installed on the locking handle seat, and a long handle sleeve is installed on the outer end of the rotating lever. The rotating lever is bent and detachably connected to the locking handle seat.

[0016] In a further technical solution, a transverse groove is provided on the tailstock main shaft, and a position hole is provided on the tailstock body. A stop pin is installed in the position hole, and the bottom of the stop pin extends through the position hole and into the transverse groove.

[0017] The top of the stop pin is provided with a notch, which is suitable for installing a stop pin plug; the stop pin plug is threadedly connected to the tailstock body.

[0018] In a further technical solution, press-fit oil cups are installed between the tailstock body and the tailstock rear cover and on the tailstock body, and one set is connected to the transverse groove; a skeleton oil seal is also installed between the tailstock main shaft and the tailstock body.

[0019] Oil holes are provided between the tailstock main shaft and the main shaft nut seat, and they are connected; the tailstock main shaft and the main shaft nut seat are detachably connected.

[0020] A spindle pressure block is detachably installed inside the tailstock spindle, and the spindle pressure block is located at the bottom of the tailstock screw.

[0021] In a further technical solution, a tail frame base is installed at the bottom of the tail frame body, and a tail frame locking block one and a tail frame locking block two are installed at the bottom of the tail frame base. A tail frame locking short screw is installed on the tail frame locking block one, and the tail frame locking short screw passes through the tail frame locking block one and is threaded into the tail frame body.

[0022] A short tailstock locking screw and a long tailstock locking screw are respectively installed on the tailstock locking block 2. The short tailstock locking screw passes through the tailstock locking block and is threaded into the tailstock body; the long tailstock locking screw passes through the tailstock body and extends to the top of the tailstock body.

[0023] In a further technical solution, the tailstock base is provided with a lifting part, and a tailstock adjusting nut is threadedly installed on the lifting part; the tailstock adjusting nut is provided with a longitudinal internal thread hole; a hexagon socket head cap screw one and a hexagon socket head cap screw two are longitudinally installed at both ends of the tailstock body; a transverse screw is installed on the tailstock body, and the transverse screw is threadedly connected to the side of the lifting part.

[0024] In a further technical solution, a small hill scraper and a tail frame scraper are respectively installed on the lateral sides of the tail frame base, and a fixed bracket is installed on the side of the tail frame base opposite to the corrugated handwheel.

[0025] Compared with existing technologies, it has the following advantages:

[0026] This utility model achieves the action steps of pressing, locking or releasing the tailstock main shaft by installing a set of threaded lower locking blocks and a sliding upper locking block to quickly press or drive.

[0027] With the main spindle locked, rotating the handle in the opposite direction causes the long shaft screw to transmit force through its threaded connection with the lower locking block, loosening the lower locking block from the tailstock main spindle. When the lower locking block is stuck due to excessive tightness, the force is transmitted upwards, causing the screw to move the handle upwards. Through the crescent-shaped locking key, the upper locking block is loosened from the main spindle, achieving the same purpose of loosening the main spindle. After the main spindle is loosened, rotating the lever causes the tailstock main spindle to feed, and the lower locking block is also loosened due to the feed motion of the main spindle. The structure is simple and the action is straightforward, achieving a quick locking or loosening effect.

[0028] The tailstock base of this utility model is equipped with a short tailstock locking screw and a long tailstock locking screw to achieve a locking connection between the tailstock base and the tailstock body, ensuring the vertical fixation effect; and the horizontal screw, the first hexagonal head screw and the second hexagonal head screw ensure the horizontal fixation effect. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the tailstock structure of this utility model. Figure 1 ;

[0030] Figure 2 This is a schematic diagram of the tailstock structure of this utility model. Figure 2 ;

[0031] Figure 3 This is a top view of the tailstock of this utility model;

[0032] Figure 4 This is a structural diagram of the tailstock body of this utility model;

[0033] Figure 5 This is an exploded schematic diagram of the tailstock of this utility model;

[0034] Figure 6 for Figure 3 Schematic diagram of AA section;

[0035] Figure 7 for Figure 3 Schematic diagram of the BB cross section;

[0036] Figure 8 for Figure 7 Enlarged structural diagram at point C;

[0037] Figure 9 This is a schematic diagram of the connection structure inside the tailstock base of this utility model.

[0038] In the picture:

[0039] 1. Tailstock body; 2. Tailstock base; 3. Tailstock locking block one; 4. Tailstock locking block two; 5. Tailstock rear cover; 6. Tailstock indexing plate; 7. Tailstock adjusting nut; 8. Upper locking block; 9. Lower locking block; 10. Tailstock spindle; 11. Spindle nut seat; 12. Tailstock lead screw; 13. Tailstock locking short screw; 14. Tailstock locking long screw; 15. Stop pin; 16. Horizontal screw; 17. Locking threaded parts; 18. Spindle pressure block; 19. Fixed bracket; 20. Stop pin plug; 21. Adjusting shim; 22. Tailstock scraper; 23. Small hill scraper; 24. Skeleton oil seal; 25. Press-fit oil cup; 26. Corrugated handwheel; 27. Handle; 28. Socket head cap screw one; 29. ​​Socket head cap screw two; 30. Locking key; 31. Tailstock lower sealing plate; 32. Locking hole; 101. Transverse groove;

[0040] 171. Long shaft screw; 172. Rotating lever; 173. Locking handle seat; 174. Long handle sleeve; 175. Annular notch one; 176. Large diameter section one; 177. Large diameter section two; 178. Annular notch two. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] Example 1

[0043] Please see Figure 1-8 This utility model provides a technical solution, a tailstock main shaft self-unlocking structure, including a tailstock body 1, an installation cavity is provided on the tailstock body 1, a tailstock screw 12 is installed in the installation cavity, a tailstock closure is installed at the end of the tailstock screw 12, the tailstock closure is connected to the tailstock body 1, and a corrugated handwheel 26 is installed on the side opposite to the tailstock screw 12.

[0044] A main shaft nut seat 11 is installed on the tailstock screw 12. A tailstock main shaft 10 is installed on the side of the main shaft nut seat 11 facing away from the tailstock enclosure. The tailstock main shaft 10 is cylindrical.

[0045] like Figure 4As shown, a locking hole 32 is installed on the tailstock body 1. A locking threaded part 17, an upper locking block 8 and a lower locking block 9 are installed in the locking hole 32. The bottom of the upper locking block 8 is provided with an upper notch on the side opposite to the tailstock main shaft 10. The top of the lower locking block 9 is provided with a lower notch on the side opposite to the tailstock main shaft 10. The upper notch and the lower notch are suitable for moving and abutting against the tailstock main shaft 10.

[0046] Combination Figure 7 and Figure 8 As shown, the locking threaded component 17 includes a long shaft screw 171, on which a locking handle seat 173 is threadedly connected and located at the outer end of the locking hole 32; the bottom of the long shaft screw 171 is threadedly connected to the lower locking block 9, and an annular notch 175 is provided on the long shaft screw 171, in which a locking key 30 is installed; an installation port is provided in the upper locking block 8, which engages with the locking key 30; the vertical dimension of the annular notch 175 is greater than the vertical height of the locking key 30; a tailstock lower sealing plate 31 is installed at the bottom of the locking hole 32, and the tailstock lower sealing plate 31 closes the bottom end of the locking hole 32. The upper locking block 8 has a stepped hole 81 in the middle; the long shaft screw 171 is integrally provided with a large diameter part 176 and a large diameter part 177, the outer diameters of the large diameter parts 176 and 177 are the same and are arranged in parallel; an annular notch 175 is provided between the large diameter parts 176 and 177; the large diameter part 176 is located on the upper side of the large diameter part 177; the large diameter part 177 is located at the bottom of the large diameter part 176 and movably abuts against the stepped surface. An adjusting shim 21 is installed on the long shaft screw 171, the outer diameter of the adjusting shim 21 is adapted to the inner diameter of the locking hole 32; an annular notch 178 is opened at the top of the large diameter part 176, the annular notch 178 is suitable for engaging the adjusting shim 21.

[0047] like Figure 6As shown, the tailstock enclosure includes a tailstock indexing plate 6 and a tailstock rear cover 5, which is detachably connected to the tailstock body 1. The tailstock indexing plate 6 is installed on the side of the tailstock rear cover 5 opposite to the tailstock body 1. The tailstock rear cover 5 has a central hole and is sleeved on the tailstock screw 12. The tailstock indexing plate 6 is fixedly connected to the tailstock screw 12. The corrugated handwheel 26 is type B and has a handle 27. A rotating lever 172 is installed on the locking handle seat 173. A long handle sleeve 174 is installed on the outer end of the rotating lever 172. The rotating lever 172 is bent and detachably connected to the locking handle seat 173. A transverse groove 101 is provided on the tailstock main shaft 10. A position hole is provided on the tailstock body 1, and a stop pin 15 is installed in the position hole. The bottom of the stop pin 15 passes through the position hole and extends into the transverse groove. A notch is provided on the top of the stop pin 15, which is suitable for installing a stop pin plug 20. The stop pin plug 20 is threadedly connected to the tailstock body 1. A press-fit type oil cup 25 is installed between the tailstock body 1 and the tailstock rear cover 5, and one set is connected to the transverse groove 101. A skeleton oil seal 24 is also installed between the tailstock main shaft 10 and the tailstock body 1. Oil holes are provided between the tailstock main shaft 10 and the main shaft nut seat 11, and they are connected. The tailstock main shaft 10 and the main shaft nut seat 11 are detachably connected. A main shaft pressure block 18 is detachably installed in the tailstock main shaft 10, and the main shaft pressure block 18 is located at the bottom of the tailstock screw 12.

[0048] When the tailstock spindle 10 needs to be locked, rotate the lever 172 to rotate, and the locking handle seat 173 presses the adjusting shim 21 to drive the upper locking block 8 downward, while the screw rotates to drive the lower locking block 9 upward. The two move towards each other and gradually get closer. Under the constraint of the tailstock body 1, pressure is generated on the tailstock spindle 10, resulting in friction, which locks the tailstock spindle 10. At this time, it can provide support for long shaft workpieces.

[0049] To ensure the overall appearance of the tailstock, the outer diameter of the locking handle seat 173 is slightly larger than the diameter of the locking hole 32 on the tailstock body 1. The adjusting shim 21 can enter the locking hole, and the locking handle seat is limited by the tailstock body. According to the design, when locked, the locking handle seat 173 is flush with the upper surface of the tailstock body 1, which plays a pressing role. However, in actual production and assembly, there are production errors, which can easily cause the locking handle seat 173 to press on the tailstock body 1, failing to transfer the pressure to the upper locking block 8 and thus failing to lock the tailstock spindle 10. Therefore, an improvement was made by adding an adjusting shim 21 between the locking handle seat 173 and the upper locking block 8. The outer diameter of the adjusting shim 21 is slightly smaller than the diameter of the locking hole on the tailstock body 1, so it will not interfere with the tailstock body 1 and can better transfer the pressure of the locking handle seat 173 to the upper locking block 8 to lock the tailstock spindle 10.

[0050] When the spindle needs to be released, the reverse rotation of the lever 172 rotates, causing the lower locking block 9 of the long shaft screw 171 to move downwards. When the lower locking block 9 reaches the tailstock lower end plate 31, it is stopped. The locking screw 17 drives the locking key 30 upwards, and the locking key 30 is locked inside the upper locking block 8. This causes the upper and lower locking blocks to move in opposite directions, gradually increasing the distance between them and releasing the restraint, thereby releasing the spindle. At the same time, the tailstock lower end plate 31 can prevent the entry of foreign objects, protecting the stability and reliability of the structure.

[0051] This utility model features workpiece support and fixation, an aesthetically pleasing overall appearance, unobstructed transmission of pressure, reliable locking of the spindle, easy and trouble-free loosening of the spindle, and a protective structure that is not easily damaged.

[0052] Example 2

[0053] like Figure 9 As shown, this is another embodiment of the present invention, based on embodiment 1, in... Figure 1 Based on the removal of unconnected parts from the tailstock body 1 and tailstock base 2, the following connection diagram of the tailstock base is obtained: the tailstock base 2 is installed at the bottom of the tailstock body 1, and tailstock locking block 1 3 and tailstock locking block 2 4 are installed at the bottom of the tailstock base 2. The tailstock locking short screw 13 is installed on the tailstock locking block 1 3, and the tailstock locking short screw 13 passes through the tailstock locking block 1 3 and is threaded into the tailstock body 1.

[0054] Tailstock locking short screw 13 and tailstock locking long screw 14 are respectively installed on tailstock locking block 2 4. Tailstock locking short screw 13 passes through tailstock locking block and is threaded into tailstock body 1; tailstock locking long screw passes through tailstock body 1 and extends to the top of tailstock body 1.

[0055] The tailstock base 2 is equipped with a lifting section, and a tailstock adjusting nut 7 is threaded onto the lifting section. The tailstock adjusting nut 7 has a longitudinal internal thread hole. At both ends of the tailstock body 1, a first hexagonal head screw 28 and a second hexagonal head screw 29 are longitudinally installed. A transverse screw 16 is installed on the tailstock body 1, threaded onto the side of the lifting section. The length of the second hexagonal head screw 29 is less than that of the first hexagonal head screw 28, and both are M16 bolts. The second hexagonal head screw 29 is M16*160mm, and the first hexagonal head screw 28 is M16*200mm.

[0056] The tailstock base 2 is equipped with a small mountain scraper 23 and a tailstock scraper 22 on its two horizontal sides respectively. The small mountain scraper 23 is installed on the slide rail to remove the waste on the slide rail. A fixed bracket 19 is installed on the side of the tailstock base 2 that is away from the corrugated handwheel 26.

[0057] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A self-unlocking structure for a tailstock spindle, characterized in that, Includes a tail frame body (1), on which an installation cavity is provided, and a tail frame screw (12) is installed in the installation cavity. A tail frame closure is installed at the end of the tail frame screw (12), and the tail frame closure is connected to the tail frame body (1). A corrugated handwheel (26) is installed on the side opposite to the tail frame screw (12). A main shaft nut seat (11) is installed on the tailstock screw (12). The tailstock main shaft (10) is installed on the side of the main shaft nut seat (11) facing away from the tailstock enclosure. The tailstock main shaft (10) is cylindrical. The tailstock body (1) is equipped with a locking hole (32), and a locking threaded part (17), an upper locking block (8) and a lower locking block (9) are installed in the locking hole (32). The bottom of the upper locking block (8) is provided with an upper notch on the side opposite to the tailstock main shaft (10), and the top of the lower locking block (9) is provided with a lower notch on the side opposite to the tailstock main shaft (10). The upper notch and the lower notch are adapted to movably abut against the tailstock main shaft (10). The locking threaded component (17) includes a long shaft screw (171), on which a locking handle seat (173) is threadedly connected and located at the outer end of the locking hole (32); the bottom of the long shaft screw (171) is threadedly connected to the lower locking block (9), and an annular recess (175) is provided on the long shaft screw (171), in which a locking key (30) is installed; an installation port is provided in the upper locking block (8), and the installation port is engaged with the locking key (30); the vertical dimension of the annular recess (175) is greater than the vertical height of the locking key (30); a tailstock lower sealing plate (31) is installed at the bottom of the locking hole (32), and the tailstock lower sealing plate (31) closes the bottom end of the locking hole (32).

2. The tailstock spindle self-unlocking structure according to claim 1, characterized in that, The upper locking block (8) is provided with a stepped hole (81) in the middle; the long shaft screw (171) is integrally provided with a large diameter part one (176) and a large diameter part two (177), the outer diameter of the large diameter part one (176) and the large diameter part two (177) are the same and are arranged in parallel; an annular notch one (175) is provided between the large diameter part one (176) and the large diameter part two (177); the large diameter part one (176) is located on the upper side of the large diameter part two (177); The second large-diameter section (177) is located at the bottom of the first large-diameter section (176) and is movably abutted against the step surface.

3. The tailstock spindle self-unlocking structure according to claim 2, characterized in that, An adjusting shim (21) is installed on the long shaft screw (171), and the outer diameter of the adjusting shim (21) is adapted to the inner diameter of the locking hole (32); an annular recess (178) is provided at the top of the large diameter part (176), and the annular recess (178) is suitable for engaging the adjusting shim (21).

4. The tailstock spindle self-unlocking structure according to claim 2, characterized in that, The tailstock enclosure includes a tailstock indexing plate (6) and a tailstock rear cover (5). The tailstock rear cover (5) is detachably connected to the tailstock body (1). The tailstock indexing plate (6) is installed on the side of the tailstock rear cover (5) facing away from the tailstock body (1). The tailstock rear cover (5) has a central hole and is sleeved on the tailstock screw (12). The tailstock indexing plate (6) is fixedly connected to the tailstock screw (12).

5. The tailstock spindle self-unlocking structure according to claim 2, characterized in that, The corrugated handwheel (26) is of type B and is equipped with a handle (27). A rotating handle (172) is installed on the locking handle seat (173). A long handle sleeve (174) is installed on the outer end of the rotating handle (172). The rotating handle (172) is bent and detachably connected to the locking handle seat (173).

6. The tailstock spindle self-unlocking structure according to claim 2, characterized in that, A transverse groove (101) is provided on the tailstock main shaft (10), and a position hole is provided on the tailstock body (1). A stop pin (15) is installed in the position hole. The bottom of the stop pin (15) extends through the position hole and into the transverse groove. The top of the stop pin (15) is provided with a notch and is suitable for installing a stop pin plug (20); the stop pin plug (20) is threadedly connected to the tailstock body (1).

7. The tailstock spindle self-unlocking structure according to claim 2, characterized in that, A press-fit oil cup (25) is installed between the tailstock body (1) and the tailstock rear cover (5) and on the tailstock body (1), and one set is connected to the transverse groove (101); a skeleton oil seal (24) is also installed between the tailstock main shaft (10) and the tailstock body (1). Oil holes are provided between the tailstock main shaft (10) and the main shaft nut seat (11) and are connected to each other; the tailstock main shaft (10) and the main shaft nut seat (11) are detachably connected. A spindle pressure block (18) is detachably installed inside the tailstock spindle (10), and the spindle pressure block (18) is located at the bottom of the tailstock screw (12).

8. A tailstock spindle self-unlocking structure according to any one of claims 1-7, characterized in that, Tail frame base (2) is installed at the bottom of the tail frame body (1). Tail frame locking block 1 (3) and tail frame locking block 2 (4) are installed at the bottom of the tail frame base (2). Tail frame locking short screw (13) is installed on tail frame locking block 1 (3). Tail frame locking short screw (13) passes through tail frame locking block 1 (3) and is threaded into the tail frame body (1). Tail frame locking short screws (13) and tail frame locking long screws (14) are respectively installed on tail frame locking block two (4). The tail frame locking short screws (13) pass through the tail frame locking block and are threaded into the tail frame body (1). The tail frame locking long screws pass through the tail frame body (1) and extend to the top of the tail frame body (1).

9. The tailstock spindle self-unlocking structure according to claim 8, characterized in that, The tailstock base (2) is provided with a lifting part, and a tailstock adjusting nut (7) is threaded on the lifting part; the tailstock adjusting nut (7) is provided with a longitudinal internal thread hole; a hexagonal head screw one (28) and a hexagonal head screw two (29) are longitudinally installed at both ends of the tailstock body (1); a transverse screw (16) is installed on the tailstock body (1), and the transverse screw (16) is threaded to the side of the lifting part.

10. The tailstock spindle self-unlocking structure according to claim 9, characterized in that, The tailstock base (2) is equipped with a small hill scraper (23) and a tailstock scraper (22) on its lateral sides respectively, and a fixed bracket (19) is installed on the side of the tailstock base (2) facing away from the corrugated handwheel (26).

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