Main shaft type movable tailstock of numerical control machine tool

Abstract

A spindle type movable tailstock of a numerical control machine tool comprises a tailstock body, a shaft hole formed in the upper portion of the tailstock body and a sleeve arranged in the shaft hole, a tip is arranged at the left end of the sleeve, and a left limiting structure matched with the left end of the sleeve is arranged at an orifice in the left end of the shaft hole; an extension shaft is arranged in the center of the right end surface of the sleeve; a right limiting structure matched with the extension shaft is arranged at a right end orifice of the shaft hole; an annular clamping groove is formed in the left part of the sleeve; a clamping spring matched with the clamping groove is arranged in the clamping groove, and the outer edge of the clamping spring protrudes outwards to the outside of the clamping groove. A plurality of left bearings located between the outer wall of the sleeve and the inner wall of the shaft hole are arranged between the clamping spring and the right limiting structure. And an annular adapter is arranged between the right limiting structure and the right side wall of the upper part of the tailstock main body. According to the spindle type movable tailstock of the numerical control machine tool, it can be guaranteed that the center rotates smoothly, and meanwhile the center is prevented from being eccentric.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tools, and in particular to a spindle-type moving tailstock for CNC machine tools. Background Technology

[0002] The tailstock serves as an auxiliary support for the workpiece during CNC machine tool machining. The tailstock moves to place the center against the tail end of the workpiece, while the machine tool fixture fixes the head end of the workpiece. By fixing both ends of the workpiece, the stability of the workpiece during machining is ensured.

[0003] During actual machining of a workpiece, the machine tool spindle drives the workpiece to rotate. At this time, the center needs to match the rotation of the workpiece. In traditional machine tool tailstocks, the center is located inside a sleeve. To achieve the rotation of the center, a bearing is installed between the outer wall of the center and the inner wall of the sleeve. The bearing provides support, but its support capacity largely depends on its diameter. There is only a very small space between the outer wall of the center and the inner wall of the sleeve for installing the bearing. Therefore, the support capacity of the bearing between the outer wall of the center and the inner wall of the sleeve is extremely limited. When the machine tool cuts the rotating workpiece, it generates a great force. If the support capacity of the bearing is insufficient, vibration is likely to occur. In severe cases, the center may become eccentric, seriously affecting the machining accuracy of the workpiece. Summary of the Invention

[0004] The present invention aims to solve the existing technical problem by providing a spindle-type moving tailstock for CNC machine tools, which can ensure smooth rotation of the center point while avoiding center point eccentricity.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] This utility model discloses a spindle-type moving tailstock for a CNC machine tool, including a tailstock body, a shaft hole located on the upper part of the tailstock body, and a sleeve disposed within the shaft hole. The sleeve has a center point at its left end, and the left end opening of the shaft hole has a left limiting structure matching the left end of the sleeve. An extension shaft is located at the center of the right end face of the sleeve; the right end opening of the shaft hole has a right limiting structure matching the extension shaft; a ring-shaped retaining groove is located on the left side of the sleeve; a retaining spring is disposed within the retaining groove, with its outer edge protruding outwards beyond the groove; the retaining spring and... A plurality of left bearings are provided between the right limiting structure and the outer wall of the sleeve and the inner wall of the shaft hole; an annular adapter is provided between the right limiting structure and the upper right side wall of the tailstock body; an extension tube extends to the left from the left end of the inner hole of the adapter and fits against the inner wall of the right end of the shaft hole; an annular limiting part extends inward from the edge of the left end of the extension tube; a plurality of right bearings are provided between the limiting part and the right limiting structure and the outer wall of the extension shaft and the inner wall of the extension tube; a lubrication structure matching the right bearings is provided on the extension tube.

[0007] The left limiting structure includes an annular left end cap, which is fitted over the left end of the sleeve; the right side wall of the left end cap is in contact with the upper left side wall of the tailstock body; the left end cap and the tailstock body are fixed together by a number of screws evenly distributed in a circle; an annular positioning part extends inward from the edge of the left end opening of the inner hole of the left end cap; a locking part is provided on the outer wall of the left end of the sleeve, located to the right of the positioning part; a number of left bearings are located between the right side wall of the locking part and the left side wall of the outer edge of the retaining spring.

[0008] The right limiting structure includes an annular right end cap, which is fitted over the right side of the extension shaft and fits against the right side wall of the adapter; several right bearings are located between the right side wall of the limiting part and the left side wall of the right end cap; a nut located inside the inner hole of the right end cap is screwed onto the right end of the extension shaft, and a washer fitted outside the extension shaft is provided between the left side wall of the nut and the rightmost right bearing; several screw holes are provided on the upper right side wall of the tailstock body in a circular pattern around the outer ring of the right end hole of the shaft hole; several countersunk holes communicating with the screw holes are provided on the adapter; several through holes communicating with the countersunk holes are provided on the outer edge of the right end cap.

[0009] The left side of the extension shaft is provided with an annular limiting step, and several right bearings are located between the limiting step and the left side wall of the washer.

[0010] The lubrication structure includes several oil reservoirs arranged circumferentially on the outer wall of the extension tube; the inner wall of the extension tube is provided with oil passage holes that communicate with the bottom of the oil reservoirs; there are two right bearings, and the positions where the two right bearings are in contact are opposite to the inner end openings of the oil passage holes; the inner wall of the oil reservoir opening is provided with an annular locking step; a matching sealing plug is provided inside the oil reservoir opening; the outer end of the sealing plug is provided with a sealing part that matches the locking step; the sealing plug and the sealing part are integrally formed and are both made of rubber.

[0011] The upper surface of the tailstock body has an oil injection hole on the left side that communicates with the shaft hole; a matching sealing cap is screwed into the outer end of the oil injection hole; there are two left bearings, and the two left bearings are in contact with each other and are opposite to the inner end of the oil injection hole.

[0012] A dust cover is provided on the right side of the right end cover, which covers the inner hole of the right end cover; the dust cover and the right end cover are fixed together by a number of screws that are evenly distributed in a circle.

[0013] The lower surface of the tailstock body is provided with a screw seat; the center of the screw seat is provided with a mounting hole; the lower front and rear sides of the tailstock body are provided with symmetrical mounting plates.

[0014] The beneficial effects of this utility model are:

[0015] Compared with existing technologies, the spindle-type moving tailstock of the CNC machine tool using the structure of this utility model has its left and right bearings located between the inner wall of the shaft hole and the outer wall of the sleeve. Since the outer diameter of the sleeve is much larger than the outer diameter of the center, the space between the inner wall of the shaft hole and the outer wall of the sleeve is much larger than the space between the outer wall of the center and the inner wall of the sleeve. Therefore, the left and right bearings can be large-diameter bearings, which effectively ensures the support capacity of the left and right bearings and avoids the situation where the center cannot withstand the force generated during workpiece machining due to insufficient support capacity of the left and right bearings. This effectively ensures the stability of the center when it is pressed against the workpiece and effectively ensures the machining accuracy of the workpiece. The lubrication structure can lubricate the right bearing, and the oil injection hole can lubricate the left bearing, which effectively ensures the smoothness of the center rotation and extends the service life of the left and right bearings, ultimately extending the service life of the tailstock. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the spindle-type moving tailstock of the CNC machine tool of this utility model;

[0017] Figure 2 yes Figure 1 An enlarged view of part A;

[0018] Figure 3 yes Figure 1 An enlarged view of part B;

[0019] Figure 4 This is a schematic diagram of the spindle-type moving tailstock of the CNC machine tool of this utility model. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0021] Please see Figures 1 to 4This utility model provides a spindle-type moving tailstock for a CNC machine tool, including a tailstock body 1, a shaft hole 2 located on the upper part of the tailstock body 1, and a sleeve 3 located in the shaft hole 2. The sleeve 3 has a center point 4 at its left end. The left end opening of the shaft hole 2 has a left limiting structure matching the left end of the sleeve 3. An extension shaft 5 is located at the center of the right end face of the sleeve 3. The right end opening of the shaft hole 2 has a right limiting structure matching the extension shaft 5. An annular groove 6 is located on the left side of the sleeve 3. A matching retaining spring 7 is located in the groove 6, with its outer edge protruding outwards to the outside of the groove 6. The retaining spring 7 and the right... A plurality of left bearings 8 are provided between the limiting structures and between the outer wall of the sleeve 3 and the inner wall of the shaft hole 2; a ring-shaped adapter 9 is provided between the right limiting structure and the upper right side wall of the tailstock body 1; an extension tube 10 extends to the left from the left end of the inner hole of the adapter 9 and fits against the inner wall of the right end of the shaft hole 2; a ring-shaped limiting part 11 extends inward from the edge of the left end of the extension tube 10; a plurality of right bearings 12 are provided between the limiting part 11 and the right limiting structure and between the outer wall of the extension shaft 5 and the inner wall of the extension tube 10; a lubrication structure matching the right bearings 12 is provided on the extension tube 10.

[0022] The left limiting structure includes a ring-shaped left end cap 13, which is fitted over the left end of the sleeve 3; the right side wall of the left end cap 13 is in contact with the upper left side wall of the tailstock body 1; the left end cap 13 and the tailstock body 1 are fixed together by a number of screws evenly distributed in a circle; a ring-shaped positioning part 14 extends inward from the left end opening edge of the inner hole of the left end cap 13; a locking part 15 located to the right of the positioning part 14 is provided on the outer wall of the left end of the sleeve 3; a number of left bearings 8 are located between the right side wall of the locking part 15 and the left side wall of the outer edge of the retaining spring 7.

[0023] The right limiting structure includes a ring-shaped right end cap 16, which is fitted around the right side of the extension shaft 5 and fits against the right side wall of the adapter 9; several right bearings 12 are located between the right side wall of the limiting part 11 and the left side wall of the right end cap 16; a nut 17 is screwed onto the right end of the extension shaft 5 and located inside the hole of the right end cap 16; a washer 18 is provided between the left side wall of the nut 17 and the rightmost right bearing 12, which is fitted onto the extension shaft 5; several screw holes 19 are provided on the upper right side wall of the tailstock body 1 in a circular pattern around the outer ring of the right end hole of the shaft hole 2; several countersunk holes 20 are provided on the adapter 9 and communicate with the screw holes; several through holes 21 are provided on the outer edge of the right end cap 16 and communicate with the countersunk holes 20.

[0024] The left side of the extension shaft 5 is provided with an annular limiting step 22, and several right bearings 12 are located between the limiting step 22 and the left side wall of the washer 18.

[0025] The lubrication structure includes several oil storage grooves 23 arranged circumferentially on the outer wall of the extension tube 10; the inner wall of the extension tube 10 is provided with oil passage holes 24 that communicate with the bottom of the oil storage grooves 23; there are two right bearings 12, and the positions where the two right bearings 12 are in contact are opposite to the inner end openings of the oil passage holes 24; the inner wall of the oil storage groove 23 is provided with an annular locking step 25; a matching sealing plug 26 is provided in the oil storage groove 23; the outer end of the sealing plug 26 is provided with a sealing part 27 that matches the locking step 25; the sealing plug 26 and the sealing part 27 are integrally formed and are both made of rubber.

[0026] The upper surface of the tailstock body 1 has an oil injection hole 28 that communicates with the shaft hole 2 on the left side; a matching sealing cap 29 is screwed into the outer end of the oil injection hole 28; there are two left bearings 8, and the two left bearings 8 are in contact with each other and are opposite to the inner end of the oil injection hole 28.

[0027] A dust cover 30 is provided on the right side of the right end cover 16, and the dust cover 30 covers the inner hole of the right end cover 16; the dust cover 30 and the right end cover 16 are fixed together by a number of screws that are evenly distributed in a circle.

[0028] The lower surface of the tailstock body 1 is provided with a screw seat 31; the center of the screw seat 31 is provided with a mounting hole 32; the lower front and rear sides of the tailstock body 1 are provided with symmetrical mounting plates 33.

[0029] The method of using this utility model is as follows:

[0030] Since both the left bearing 8 and the right bearing 12 are located between the inner wall of the shaft hole 2 and the outer wall of the sleeve 3, and the outer diameter of the sleeve 3 is much larger than the outer diameter of the center 4, the space between the inner wall of the shaft hole 2 and the outer wall of the sleeve 3 is much larger than the space between the outer wall of the center 4 and the inner wall of the sleeve 3. Therefore, the left bearing 8 and the right bearing 12 can be large-diameter bearings, which effectively ensures the support capacity of the left bearing 8 and the right bearing 12 and avoids the situation where the center cannot withstand the force generated during workpiece processing due to insufficient support capacity of the left bearing 8 and the right bearing 12. This effectively ensures the stability of the center 4 when it is pressed against the workpiece and effectively ensures the machining accuracy of the workpiece. The lubrication structure can lubricate the right bearing 12, and the oil injection hole 28 can lubricate the left bearing 8, which effectively ensures the smoothness of the rotation of the center 4 and extends the service life of the left bearing 8 and the right bearing 12, and ultimately extends the service life of the tailstock.

[0031] The oil reservoir 23 can be used to store a large amount of grease. The grease in the upper oil reservoir 23 can enter the extension tube 10 through the oil passage 24 under the action of gravity, thereby penetrating to the position where the two right bearings 12 are in contact, and achieving a lubrication effect. The grease in the lower oil reservoir 23 will not be consumed. Simply pass the screw through the through hole 21 and the countersunk hole 20 in sequence and screw it into the screw hole 19 to fix the right end cover 16 and the adapter 9 to the tailstock body 1. Therefore, simply unscrew the screw to achieve the rotation of the adapter 9. When the adapter 9 rotates the oil reservoir 23, which still stores grease, to the top, it can continue to achieve a lubrication effect. Then, fix the adapter 9 and the right end cover 16 to the tailstock body 1 with the screw.

[0032] Since the surface of the tailstock body 1 is directly exposed, when the left bearing 8 needs to be lubricated, simply unscrew the sealing cap 29 from the upper opening of the oil injection hole 28, and add grease to the contact area between the two left bearings 8 through the oil injection hole 28 to achieve a lubrication effect. After lubrication, screw the sealing cap 29 back on to prevent external dust from entering. The entire lubrication process is extremely simple and can effectively ensure lubrication efficiency.

[0033] The left limiting structure includes a ring-shaped left end cap 13, which is fitted over the left end of the sleeve 3. The right side wall of the left end cap 13 is in contact with the upper left side wall of the tailstock body 1. The left end cap 13 and the tailstock body 1 are fixed by a number of screws evenly distributed in a circle. A ring-shaped positioning part 14 extends inward from the edge of the left end opening of the inner hole of the left end cap 13. A locking part 15 located to the right of the positioning part 14 is provided on the outer wall of the left end of the sleeve 3. A number of left bearings 8 are located between the right side wall of the locking part 15 and the left side wall of the outer edge of the retaining spring 7. This fixing method not only ensures the stability of the left bearings 8, but also facilitates the disassembly and assembly of the left end cap 13, thereby facilitating the maintenance and replacement of the left bearings 8.

[0034] The right limiting structure includes a ring-shaped right end cover 16, which is fitted around the right side of the extension shaft 5. Several right bearings 12 are located between the right side wall of the limiting part 11 and the left side wall of the right end cover 16. A nut 17 located in the inner hole of the right end cover 16 is screwed onto the right end of the extension shaft 5. A washer 18 is provided between the left side wall of the nut 17 and the rightmost right bearing 12, which is located outside the extension shaft 5. This fixing method can not only ensure the stability of the right bearing 12, but also facilitate the disassembly and assembly of the right bearing 12.

[0035] The left side of the extension shaft 5 is provided with a ring-shaped limiting step 22. Several right bearings 12 are located between the limiting step 22 and the left side wall of the washer 18. The existence of the limiting step 22 can further limit the right bearings 12 and further ensure the stability of the right bearings 12.

[0036] A dust cover 30 is provided on the right side of the right end cover 16. The dust cover 30 covers the inner hole of the right end cover 16. The dust cover 30 and the right end cover 16 are fixed together by a number of screws that are evenly distributed around the circumference. The presence of the dust cover 30 can effectively prevent external dust from contaminating the right bearing 12 through the gap between the inner wall of the right end cover 16 and the outer wall of the extension shaft 5.

[0037] The lower surface of the tailstock body 1 is provided with a screw seat 31, and the center of the screw seat 31 is provided with a mounting hole 32. The lower front and rear sides of the tailstock body 1 are provided with symmetrical mounting plates 33. The mounting hole 32 can be used to install a screw sleeve, so that the screw sleeve can be screwed to the screw rod connected to the motor shaft of the servo motor. The lower surface of the mounting plate 33 can be used to install a slider that matches the guide rail, which plays a limiting role, thereby ensuring that the servo motor can drive the tailstock body 1 to translate when it is running, and finally realize the movement of the tip 4.

Claims

1. A main shaft type movable tailstock of a numerical control machine tool, comprising a tailstock body, a shaft hole arranged at an upper portion of the tailstock body, and a sleeve arranged in the shaft hole, a center is arranged at a left end of the sleeve, and the tailstock is characterized in that: The left end of the shaft hole is provided with a left limiting structure that matches the left end of the sleeve; the right end face of the sleeve is provided with an extension shaft at its center; the right end of the shaft hole is provided with a right limiting structure that matches the extension shaft; the left side of the sleeve is provided with an annular groove; a matching retaining spring is provided in the groove, with the outer edge of the retaining spring protruding outward to the outside of the groove; several left bearings are provided between the retaining spring and the right limiting structure, located between the outer wall of the sleeve and the inner wall of the shaft hole; an annular adapter is provided between the right limiting structure and the upper right side wall of the tailstock body; the left end of the adapter's inner hole extends to the left into an extension tube that fits against the inner wall of the right end of the shaft hole; the left end of the extension tube extends inward into an annular limiting part; several right bearings are provided between the limiting part and the right limiting structure, located between the outer wall of the extension shaft and the inner wall of the extension tube; the extension tube is provided with a lubrication structure that matches the right bearings.

2. The main shaft type movable tailstock of the numerical control machine tool according to claim 1, characterized in that: The left limiting structure includes an annular left end cap, which is fitted over the left end of the sleeve; the right side wall of the left end cap is in contact with the upper left side wall of the tailstock body; the left end cap and the tailstock body are fixed together by a number of screws evenly distributed in a circle; an annular positioning part extends inward from the edge of the left end opening of the inner hole of the left end cap; a locking part is provided on the outer wall of the left end of the sleeve, located to the right of the positioning part; a number of left bearings are located between the right side wall of the locking part and the left side wall of the outer edge of the retaining spring.

3. The main shaft type movable tailstock of the numerical control machine tool according to claim 1, characterized in that: The right limiting structure includes an annular right end cap, which is fitted over the right side of the extension shaft and fits against the right side wall of the adapter; several right bearings are located between the right side wall of the limiting part and the left side wall of the right end cap; a nut located inside the inner hole of the right end cap is screwed onto the right end of the extension shaft, and a washer fitted outside the extension shaft is provided between the left side wall of the nut and the rightmost right bearing; several screw holes are provided on the upper right side wall of the tailstock body in a circular pattern around the outer ring of the right end hole of the shaft hole; several countersunk holes communicating with the screw holes are provided on the adapter; several through holes communicating with the countersunk holes are provided on the outer edge of the right end cap.

4. The main shaft type movable tailstock of the numerical control machine tool according to claim 3, characterized in that: The left side of the extension shaft is provided with an annular limiting step, and several right bearings are located between the limiting step and the left side wall of the washer.

5. The main shaft type movable tailstock of the numerical control machine tool according to claim 1, characterized in that: The lubrication structure includes several oil reservoirs arranged circumferentially on the outer wall of the extension tube; the inner wall of the extension tube is provided with oil passage holes that communicate with the bottom of the oil reservoirs; there are two right bearings, and the positions where the two right bearings are in contact are opposite to the inner end openings of the oil passage holes; the inner wall of the oil reservoir opening is provided with an annular locking step; a matching sealing plug is provided inside the oil reservoir opening; the outer end of the sealing plug is provided with a sealing part that matches the locking step; the sealing plug and the sealing part are integrally formed and are both made of rubber.

6. The main shaft type movable tailstock of a numerically controlled machine tool according to claim 1, characterized in that: The upper surface of the tailstock body has an oil injection hole on the left side that communicates with the shaft hole; a matching sealing cap is screwed into the outer end of the oil injection hole; there are two left bearings, and the two left bearings are in contact with each other and are opposite to the inner end of the oil injection hole.

7. The main shaft type movable tailstock of the numerical control machine tool according to claim 3, characterized in that: A dust cover is provided on the right side of the right end cover, which covers the inner hole of the right end cover; the dust cover and the right end cover are fixed together by a number of screws that are evenly distributed in a circle.

8. The main shaft type movable tailstock of a numerically controlled machine tool according to claim 1, characterized in that: The lower surface of the tailstock body is provided with a screw seat, the center of the screw seat is provided with a mounting hole, and the front and rear sides of the lower part of the tailstock body are provided with mounting plates which are symmetrical to each other.

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