Telescopic tailstock of numerical control machine tool

Abstract

A telescopic tailstock of a numerical control machine tool comprises a tailstock body, a telescopic hole formed in the upper portion of the tailstock body and a sleeve arranged in the telescopic hole, a tip is arranged at the left end of the sleeve, and a limiting end cover matched with the telescopic hole is arranged at an orifice of the telescopic hole; a fixing hole is formed in the center of the limiting end cover; a pressure hole is formed in the center of the right end surface of the sleeve; a sealing head matched with the pressure hole is arranged in the left part of the pressure hole; an oil feeding shaft is arranged in the center of the right end surface of the sealing head; a connecting part is arranged in the center of the right end surface of the oil feeding shaft; the right end of the connecting part rightwards penetrates through the fixing hole and is in threaded connection with a limiting nut attached to the outer wall of the right side of the limiting end cover, and the right end face of the oil feeding shaft is attached to the inner wall of the right side of the limiting end cover. And a sealing end cover is arranged at the right end opening of the pressure hole. According to the telescopic tailstock of the numerical control machine tool, the rigidity of the tailstock and the fastening force of the center can be effectively guaranteed, and therefore the stability of a workpiece in the machining process is effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to numerical control machine tool field especially a telescopic tailstock of numerical control machine tool. BACKGROUND

[0002] The tailstock is the auxiliary support of workpiece when the numerical control machine tool processes the workpiece, the sleeve of traditional tailstock can move axially, thereby realizing the movement of the tailstock end of the tailstock, the tailstock end of the tailstock is on the workpiece tail end, and the machine tool clamp fixes the workpiece head end, thereby guaranteeing the stability of the workpiece processing.

[0003] The moving device of the sleeve of traditional tailstock is generally arranged outside the tailstock, and the moving device comprises a hand wheel and a lead screw connected with the hand wheel, when the hand wheel drives the lead screw to rotate, the sleeve screw connected with the lead screw changes the rotating force into the axial moving force of the sleeve under the action of the limiting device inside the tailstock, this moving mode mainly relies on the mechanical contact between the threads to transmit the force, the driving force of the lead screw is mainly concentrated on the thread contact point, stress concentration is easy to form, local deformation or vibration is easy to cause under high load, the overall rigidity is affected, and when the external thread of the lead screw matches the internal thread of the sleeve, small gaps are easy to exist between the lead screw and the sleeve, further causing the rigidity to drop, at the same time, with the increase of the moving times of the sleeve, the internal and external threads are continuously rubbed and contacted, and the wear is easy to occur, the gap between the internal and external threads is further enlarged, not only the rigidity is further weakened, but also the fastening force of the tailstock is affected, finally the stability of the workpiece processing is affected, and the machining precision cannot be guaranteed. SUMMARY

[0004] The utility model solves the prior art problems, provides a telescopic tailstock of numerical control machine tool, it can effectively guarantee the rigidity of itself and the fastening force of the tailstock, thereby effectively guaranteeing the stability of the workpiece processing.

[0005] The utility model solves the above technical problems by the technical scheme that:

[0006] This utility model discloses a telescopic tailstock for a CNC machine tool, comprising a tailstock body, a telescopic hole located on the upper part of the tailstock body, and a sleeve disposed within the telescopic hole. The sleeve has a center point on its left end. A limiting end cap matching the telescopic hole is provided at the opening of the telescopic hole. A fixing hole is provided at the center of the limiting end cap. A pressure hole is provided at the center of the right end face of the sleeve. A sealing head matching the pressure hole is provided inside the left part of the pressure hole. An oil delivery shaft is provided at the center of the right end face of the sealing head. A connecting part is provided at the center of the right end face of the oil delivery shaft. The right end of the connecting part passes through the fixing hole to the right. A limiting nut is screwed into a fixed hole and fits against the outer right side wall of the limiting end cover; the right end face of the oil delivery shaft fits against the inner right side wall of the limiting end cover; a sealing end cover is provided at the right end of the pressure hole, and a movable hole matching the oil delivery shaft is provided at the center of the sealing end cover; a pressure gap exists between the inner wall of the pressure hole and the outer wall of the oil delivery shaft; an oil delivery structure is provided on the oil delivery shaft; a groove is provided at the center of the bottom of the pressure hole; the oil delivery structure can move the sleeve to the right by supplying hydraulic oil into the pressure gap, and can move the sleeve to the left by supplying hydraulic oil into the groove.

[0007] The oil delivery structure includes a first interface and a second interface located on the right end face of the connecting part; a boss matching the groove is provided at the center of the left end face of the sealing head; the length of the boss is less than the depth of the groove; a first oil delivery channel communicating with the first interface is provided on the left end face of the boss; an oil outlet hole is provided on one side of the outer circumference of the left end of the oil delivery shaft; the oil outlet hole communicates with the second interface through the second oil delivery channel.

[0008] The sealing head has an annular left sealing groove on the outer left side; the sealing head has an annular right sealing groove on the right side; a matching left sealing ring is provided in the left sealing groove; a matching right sealing ring is provided in the right sealing groove; both the left and right sealing rings are made of rubber; the left sidewall of the left sealing ring has an annular left outward expansion groove; the right sidewall of the right sealing ring has an annular right outward expansion groove.

[0009] A sealing portion extends to the left from the edge of the left end of the movable hole, located between the outer wall of the oil delivery shaft and the inner wall of the pressure hole; the inner wall of the movable hole is provided with several axially evenly distributed inner sealing grooves; the outer circumferential surface of the sealing portion is provided with several axially evenly distributed outer sealing grooves; both the inner and outer sealing grooves are annular; the inner sealing groove is provided with a matching inner sealing ring, and the left side wall of the inner sealing ring is provided with an annular first outward expansion groove; the outer sealing groove is provided with a matching outer sealing ring, and the left side wall of the outer sealing ring is provided with an annular second outward expansion groove; both the inner and outer sealing rings are made of rubber.

[0010] There is an oil passage gap between the outer peripheral surface of the boss and the inner wall of the groove; the inner wall of the left end of the pressure hole is provided with an annular auxiliary groove, which is located on the left side of the sealing head.

[0011] The limiting end cap and the tailstock body, as well as the sealing end cap and the right end of the sleeve, are fixed together by a number of screws evenly distributed in a circle.

[0012] The beneficial effects of this utility model are:

[0013] Compared with the prior art, the telescopic tailstock of the CNC machine tool using the structure of this utility model achieves the leftward movement of the sleeve by supplying hydraulic oil to the first interface and the rightward movement of the sleeve by supplying hydraulic oil to the second interface. When the sleeve moves left and right, it will drive the center to move left and right. The entire movement process no longer relies on the mechanical contact of the threaded pair to transmit force, but on hydraulic oil. The hydraulic oil is almost incompressible under high pressure, which can make the pressure evenly applied to the bottom of the groove, the bottom of the pressure hole, the left and right end faces of the sealing head, and the left end face of the sealing part, avoiding the deformation caused by local stress concentration, effectively ensuring the overall rigidity, and avoiding the thread wear caused by the screw controlling the left and right movement of the sleeve for a long time, which would weaken the tightening force of the center. This effectively ensures the tightening force of the center and thus effectively ensures the stability of the workpiece during processing. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the telescopic tailstock of the CNC machine tool of this utility model;

[0015] Figure 2 yes Figure 1 An enlarged view of part A;

[0016] Figure 3 yes Figure 1 An enlarged view of part B;

[0017] Figure 4 This is a schematic diagram of the telescopic tailstock of the CNC machine tool of this utility model. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] Please see Figures 1 to 4This utility model provides a telescopic tailstock for a CNC machine tool, including a tailstock body 1, a telescopic hole 2 located on the upper part of the tailstock body 1, and a sleeve 3 located within the telescopic hole 2. The sleeve 3 has a center point 4 at its left end. A limiting end cap 5 is provided at the opening of the telescopic hole 2. A fixing hole 6 is provided at the center of the limiting end cap 5. A pressure hole 7 is provided at the center of the right end face of the sleeve 3. A sealing head 8 is provided in the left part of the pressure hole 7. An oil delivery shaft 9 is provided at the center of the right end face of the sealing head 8. A connecting part 10 is provided at the center of the right end face of the oil delivery shaft 9. The right end of the connecting part 10 passes through the fixing hole 6 to the right. A limiting nut 11 is screwed onto the right outer wall of the limiting end cover 5, and the right end face of the oil delivery shaft 9 is in contact with the right inner wall of the limiting end cover 5; a sealing end cover 12 is provided at the right end of the pressure hole 7, and a movable hole 13 matching the oil delivery shaft 9 is provided at the center of the sealing end cover 12; a pressure gap 14 is provided between the inner wall of the pressure hole 7 and the outer wall of the oil delivery shaft 9; an oil delivery structure is provided on the oil delivery shaft 9; a groove 15 is provided at the center of the bottom of the pressure hole 7; the oil delivery structure can move the sleeve 3 to the right by delivering hydraulic oil into the pressure gap 14, and can move the sleeve 3 to the left by delivering hydraulic oil into the groove 15.

[0020] The oil delivery structure includes a first interface 16 and a second interface 17 located on the right end face of the connecting part 10; a boss 18 matching the groove 15 is provided at the center of the left end face of the sealing head 8; the length of the boss 18 is less than the depth of the groove 15; a first oil delivery channel 19 communicating with the first interface 16 is provided on the left end face of the boss 18; an oil outlet hole 20 is provided on one side of the outer peripheral surface of the left end of the oil delivery shaft 9; the oil outlet hole 20 communicates with the second interface 17 through the second oil delivery channel 21.

[0021] The sealing head 8 has an annular left sealing groove 22 on its outer left side; the sealing head 8 has an annular right sealing groove 23 on its right side; a matching left sealing ring 24 is provided in the left sealing groove 22; a matching right sealing ring 25 is provided in the right sealing groove 23; both the left sealing ring 24 and the right sealing ring 25 are made of rubber; the left side wall of the left sealing ring 24 has an annular left outward expansion groove 26; the right side wall of the right sealing ring 25 has an annular right outward expansion groove 27.

[0022] A sealing portion 28 extends to the left from the edge of the left end of the movable hole 13, located between the outer wall of the oil supply shaft 9 and the inner wall of the pressure hole 7; the inner wall of the movable hole 13 is provided with a plurality of axially uniformly distributed inner sealing grooves 29; the outer circumferential surface of the sealing portion 28 is provided with a plurality of axially uniformly distributed outer sealing grooves 30; both the inner sealing grooves 29 and the outer sealing grooves 30 are annular; the inner sealing groove 29 is provided with a matching inner sealing ring 31, and the left side wall of the inner sealing ring 31 is provided with an annular first outward expansion groove 32; the outer sealing groove 30 is provided with a matching outer sealing ring 33, and the left side wall of the outer sealing ring 33 is provided with an annular second outward expansion groove 34; both the inner sealing ring 31 and the outer sealing ring 33 are made of rubber.

[0023] There is an oil passage gap 35 between the outer peripheral surface of the boss 18 and the inner wall of the groove 15; the inner wall of the left end of the pressure hole 7 is provided with an annular auxiliary groove 36, which is located on the left side of the sealing head 8.

[0024] The limiting end cap 5 and the tailstock body 1, and the sealing end cap 12 and the right end of the sleeve 3 are all fixed by a number of screws that are evenly distributed in a circle.

[0025] The method of using this utility model is as follows:

[0026] The first interface 16 and the second interface 17 can be used to connect different oil circuits. When the oil circuit connected to the first interface 16 supplies hydraulic oil to the first oil delivery channel 19, the hydraulic oil will directly enter the groove 15 through the left end port of the first oil delivery channel 19. With the sealing head 8 fixed, as subsequent hydraulic oil continues to enter the groove 15, the hydraulic oil will push the bottom of the groove 15 to the left, thereby realizing the leftward movement of the sleeve 3, and finally realizing the leftward movement of the tip 4. After the sleeve 3 moves to the left for a certain distance, the boss 18 completely moves out of the groove 15. At this time, the hydraulic oil sprayed from the left end port of the first oil delivery channel 19 is divided into two parts. One part enters the groove 15, and the other part enters the gap between the left end face of the sealing head 8 and the bottom of the pressure hole 7. At the same time, the hydraulic oil applies pressure to the left at the bottom of the pressure hole 7, effectively increasing the pressure area and ensuring the pressure of the hydraulic oil, thereby ensuring the stability of the tip 4 when it moves to the left.

[0027] When the tip 4 needs to be moved to the right, the oil circuit connected to the first interface 16 stops supplying hydraulic oil, and the oil circuit connected to the second interface 17 starts supplying hydraulic oil to the second water delivery channel 0. Finally, the hydraulic oil enters the pressure gap 14 through the oil outlet 20. As the hydraulic oil continuously flows into the pressure gap 14, the hydraulic pressure in the pressure gap 14 increases continuously, far exceeding the hydraulic pressure in the space on the left side of the sealing head 8. At this time, the hydraulic oil in the pressure gap 14 pushes the left end face of the sealing part 28 to the right, realizing the rightward movement of the sleeve 3, thereby realizing the rightward movement of the tip 4. When the sleeve 3 moves to the right, the hydraulic oil between the left end face of the sealing head 8 and the bottom of the pressure hole 7 is squeezed into the first oil delivery channel 19, finally realizing the return of the hydraulic oil. When the oil circuit connected to the first interface 16 supplies hydraulic oil to the first oil delivery channel 19, the sleeve 3 moves to the left, and the hydraulic oil in the pressure gap 14 returns through the oil outlet 20 and the second oil delivery channel 21 in sequence. This cycle is repeated to realize the reciprocating movement of the tip 4 in the left and right directions.

[0028] In summary, this utility model can achieve the leftward movement of the sleeve 3 by supplying hydraulic oil to the first interface 16 and the rightward movement of the sleeve 3 by supplying hydraulic oil to the second interface 17. When the sleeve 3 moves left and right, it will drive the center 4 to move left and right. The entire movement process no longer relies on the mechanical contact of the threaded pair to transmit force, but on the hydraulic oil. The hydraulic oil is almost incompressible under high pressure, which can make the pressure evenly applied to the bottom of the groove 15, the bottom of the pressure hole 7, the left and right end faces of the sealing head 8, and the left end face of the sealing part 28. This avoids the deformation caused by local stress concentration, effectively ensuring the overall rigidity. It can also avoid the situation where the screw controls the left and right movement of the sleeve for a long time, which will cause the thread to wear and weaken the tightening force of the center. This effectively ensures the tightening force of the center and thus effectively ensures the stability of the workpiece during processing.

[0029] The length of the boss 18 is less than the depth of the groove 15, so that there is always a gap between the left end face of the boss 18 and the bottom of the groove 15, ensuring that when the first oil delivery channel 19 delivers hydraulic oil into the groove 15, there is enough pressure area to act on the bottom of the groove 15, thus ensuring that the sleeve 3 can move smoothly to the left.

[0030] The left sealing ring 24 has an annular left expansion groove 26 on its left side wall. When the hydraulic oil ejected from the left end of the first oil supply channel 19 pushes the sleeve 3 to the left, the hydraulic oil will inevitably leak to the right through the gap between the outer peripheral surface of the sealing head 8 and the inner wall of the pressure hole 7. At this time, the hydraulic oil will first enter the left expansion groove 26. As more and more hydraulic oil enters the left expansion groove 26, the oil pressure in the left expansion groove 26 will continue to rise. The hydraulic oil will then squeeze the inner wall of the left expansion groove 26, thereby expanding the left sealing ring 24 and further ensuring the sealing between the outer peripheral surface of the sealing head 8 and the inner wall of the pressure hole 7, thus preventing oil leakage.

[0031] The right sealing ring 25 has an annular right expansion groove 27 on its right side wall. When hydraulic oil continuously flows into the pressure gap 14 to move the sleeve 3 to the right, the hydraulic oil will inevitably leak to the left through the gap between the outer circumference of the sealing head 8 and the inner wall of the pressure hole 7. At this time, the hydraulic oil will first enter the right expansion groove 27. As more and more hydraulic oil enters the right expansion groove 27, the oil pressure in the right expansion groove 27 will continue to rise. The hydraulic oil will squeeze the inner wall of the right expansion groove 27, thereby expanding the right sealing ring 25, further ensuring the sealing between the outer circumference of the sealing head 8 and the inner wall of the pressure hole 7, thus effectively ensuring the stability of the oil pressure when the sleeve 3 moves left and right, and ensuring rigidity.

[0032] A sealing part 28 extends to the left from the edge of the left end of the movable hole 13, located between the outer wall of the oil delivery shaft 9 and the inner wall of the pressure hole 7. The presence of the sealing part 28 can effectively increase the sealing area between the sealing end cover 12 and the right end port of the sealing hole 0, thereby effectively ensuring the sealing effect of the sealing end cover 12. When the hydraulic oil in the pressure gap 14 pushes the left end of the sealing part 28 to move to the right, the hydraulic oil will inevitably leak to the right through the gap between the outer peripheral surface of the sealing part 28 and the inner wall of the pressure hole 7, and the gap between the inner wall of the sealing part 28 and the outer wall of the oil delivery shaft 9. When the hydraulic oil attempts to pass through the gap between the inner wall of the sealing part 28 and the outer wall of the oil delivery shaft 9, the hydraulic oil will enter the first outer expansion groove 32. As the hydraulic oil continuously flows into the first outer expansion groove 32, the oil pressure in the first outer expansion groove 32 will rise accordingly. At this time, the hydraulic oil squeezes the inner wall of the first outer expansion groove 32, causing the inner sealing ring 31 to expand, thereby effectively ensuring the sealing between the inner wall of the sealing part 28 and the outer wall of the oil delivery shaft 9.

[0033] When hydraulic oil attempts to pass through the gap between the outer peripheral surface of the sealing part 28 and the inner wall of the pressure hole 7, the hydraulic oil will enter the second outer expansion groove 34. As the hydraulic oil continues to flow into the second outer expansion groove 34, the oil pressure in the second outer expansion groove 34 will rise accordingly. At this time, the hydraulic oil squeezes the inner wall of the second outer expansion groove 34, causing the outer sealing ring 33 to expand, thereby effectively ensuring the sealing between the outer peripheral surface of the sealing part 28 and the inner wall of the pressure hole 7.

[0034] There is an oil passage gap 35 between the outer peripheral surface of the boss 18 and the inner wall of the groove 15. The inner wall of the left end of the pressure hole 7 is provided with an annular auxiliary groove 36. The auxiliary groove 36 is located on the left side of the sealing head 8. When the left end port of the first oil delivery channel 19 sprays hydraulic oil into the groove 15, a part of the hydraulic oil will enter the gap between the left end face of the sealing head 8 and the bottom of the pressure hole 7 through the oil passage gap 35 between the outer peripheral surface of the boss 18 and the inner wall of the groove 15. At this time, the presence of the auxiliary groove 36 can effectively increase the oil storage capacity of the gap between the left end face of the sealing head 8 and the bottom of the pressure hole 7, thereby prolonging the actual pressure applied to the bottom of the pressure hole 7. When the sleeve 3 drives the center 4 to move to the left, the effect of layer-by-layer pressure increase is achieved. After the center 4 moves to the left and hits the workpiece, further pressure is applied, which effectively ensures the stability of the center 4 when positioning the workpiece, thereby effectively ensuring the stability of the workpiece during processing.

[0035] The limiting end cover 5 and the tailstock body 1, and the sealing end cover 12 and the right end of the sleeve 3 are all fixed by a number of screws evenly distributed in a circle. This fixing method not only facilitates the disassembly and assembly of the limiting end cover 5 and the tailstock body 1, and the sealing end cover 12 and the right end of the sleeve 3, but also facilitates the disassembly and assembly of the oil supply shaft 9. At the same time, the oil supply shaft 9 and the sealing head 8 are completely built into the tailstock body 1, so that they can effectively avoid interference from external factors and effectively ensure the overall rigidity of the tailstock.

Claims

1. A telescopic tailstock for a CNC machine tool, comprising a tailstock body, a telescopic hole disposed on the upper part of the tailstock body, and a sleeve disposed within the telescopic hole, wherein the left end of the sleeve is provided with a center point, characterized in that: The telescopic hole opening is equipped with a matching limiting end cap; the limiting end cap has a fixing hole at its center; the right end face of the sleeve has a pressure hole at its center; the left part of the pressure hole is equipped with a matching sealing head; the right end face of the sealing head has an oil delivery shaft at its center; the right end face of the oil delivery shaft has a connecting part at its center; the right end of the connecting part passes through the fixing hole to the right and is screwed with a limiting nut that fits against the right outer wall of the limiting end cap, and the right end face of the oil delivery shaft fits against the right inner wall of the limiting end cap; the right end opening of the pressure hole is equipped with a sealing end cap, and the sealing end cap has a movable hole at its center that matches the oil delivery shaft; there is a pressure gap between the inner wall of the pressure hole and the outer wall of the oil delivery shaft; the oil delivery shaft is equipped with an oil delivery structure; the bottom center of the pressure hole has a groove; the oil delivery structure can move the sleeve to the right by supplying hydraulic oil into the pressure gap, and can move the sleeve to the left by supplying hydraulic oil into the groove.

2. The telescopic tailstock of a CNC machine tool according to claim 1, characterized in that: The oil delivery structure includes a first interface and a second interface located on the right end face of the connecting part; a boss matching the groove is provided at the center of the left end face of the sealing head; the length of the boss is less than the depth of the groove; a first oil delivery channel communicating with the first interface is provided on the left end face of the boss; an oil outlet hole is provided on one side of the outer circumference of the left end of the oil delivery shaft; the oil outlet hole communicates with the second interface through the second oil delivery channel.

3. The telescopic tailstock of a CNC machine tool according to claim 1, characterized in that: The sealing head has an annular left sealing groove on the outer left side; the sealing head has an annular right sealing groove on the right side; a matching left sealing ring is provided in the left sealing groove; a matching right sealing ring is provided in the right sealing groove; both the left and right sealing rings are made of rubber; the left sidewall of the left sealing ring has an annular left outward expansion groove; the right sidewall of the right sealing ring has an annular right outward expansion groove.

4. The telescopic tailstock of a CNC machine tool according to claim 1, characterized in that: A sealing portion extends to the left from the edge of the left end of the movable hole, located between the outer wall of the oil delivery shaft and the inner wall of the pressure hole; the inner wall of the movable hole is provided with several axially evenly distributed inner sealing grooves; the outer circumferential surface of the sealing portion is provided with several axially evenly distributed outer sealing grooves; both the inner and outer sealing grooves are annular; the inner sealing groove is provided with a matching inner sealing ring, and the left side wall of the inner sealing ring is provided with an annular first outward expansion groove; the outer sealing groove is provided with a matching outer sealing ring, and the left side wall of the outer sealing ring is provided with an annular second outward expansion groove; both the inner and outer sealing rings are made of rubber.

5. A telescopic tailstock for a CNC machine tool according to claim 2, characterized in that: There is an oil passage gap between the outer peripheral surface of the boss and the inner wall of the groove; the inner wall of the left end of the pressure hole is provided with an annular auxiliary groove, which is located on the left side of the sealing head.

6. A telescopic tailstock for a CNC machine tool according to claim 1, characterized in that: The limiting end cap and the tailstock body, as well as the sealing end cap and the right end of the sleeve, are fixed together by a number of screws evenly distributed in a circle.

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