Inner plug type numerical control lathe tailstock

Abstract

An inner plug type numerical control lathe tailstock comprises a tailstock body, a moving hole transversely penetrating through the tailstock body is formed in the upper portion of the tailstock body, an ejector pin seat matched with the moving hole is arranged in the moving hole, an ejector pin mounting hole is formed in the center of the left end face of the ejector pin seat, and an ejector pin matched with the ejector pin mounting hole is arranged in the ejector pin mounting hole. A strip-shaped guide sliding groove is formed in the outer wall of the lower side of the right portion of the ejector pin base, and a right end groove opening of the guide sliding groove is located in the right end face of the ejector pin base. A guide screw hole corresponding to the guide sliding groove in position is formed in the inner wall of the lower side of the middle of the moving hole. A piston hole is formed in the center of the right end face of the ejector pin base. According to the inner plug type numerical control lathe tailstock, an oil way channel does not need to be machined on the tailstock body, movement of the ejector pin can be controlled through oil pressure, stability and machining precision during workpiece machining are guaranteed, meanwhile, the oil way channel can be simplified, difficulty of machining the oil way channel is effectively reduced, and machining efficiency is improved. And the replacement cost can be effectively reduced when the oil channel is damaged.

Description

Technical Field

[0001] The utility model relates to a tailstock of a numerically controlled lathe, in particular to an inner plug type tailstock of a numerically controlled lathe. Background Art

[0002] The tailstock of the CNC lathe is the main supporting part of the lathe fixture. After the lathe fixture clamps one end of the long straight rod workpiece, it can press against the other end of the long straight rod workpiece, which can effectively prevent the workpiece from bending and deforming due to its own weight or cutting force, thereby ensuring the machining accuracy.

[0003] The component on the tailstock of a CNC lathe that presses against the end of the workpiece is an ejector pin, which is arranged on an ejector pin seat, and the ejector pin seat is located in an oil chamber on the tailstock of the CNC lathe. The movement of the ejector pin seat is controlled by filling the oil chamber with oil and returning the oil, thereby controlling the forward ejection and backward movement of the ejector pin. Although this method of pressing the workpiece with the ejector pin can ensure the stability of the workpiece during machining, it requires machining a plurality of complex oil passages on the body of the tailstock of the CNC lathe, which seriously increases the machining difficulty of the tailstock body and ultimately increases the cost of the conveying lathe tailstock. Since the oil passage is directly arranged on the tailstock body, once the oil passage is damaged, the entire tailstock body needs to be replaced, which seriously increases the replacement cost. Summary of the invention

[0004] The utility model aims to solve the existing technical problem and provide an inner plug type CNC lathe tailstock, which does not need to process the oil passage on the tailstock body, and can also control the movement of the ejector pin by oil pressure, thereby ensuring the stability and machining accuracy of the workpiece during machining, and can also simplify the oil passage, effectively reduce the difficulty of machining the oil passage, and can effectively reduce the replacement cost when the oil passage is damaged.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] The utility model discloses an inner plug type CNC lathe tailstock, comprising a tailstock body, a movable hole which runs through the tailstock body horizontally is arranged on the upper part of the tailstock body, an ejector seat which matches the tailstock body is arranged in the movable hole, an ejector mounting hole is arranged at the center of the left end face of the ejector seat, an ejector which matches the tailstock body is arranged in the ejector mounting hole, a strip-shaped guide slide groove is arranged on the outer wall of the lower right side of the ejector seat, and the notch at the right end of the guide slide groove is located on the right end face of the ejector seat; a guide screw hole which corresponds to the position of the guide slide groove is arranged on the inner wall of the lower middle part of the movable hole; a piston hole is arranged at the center of the right end face of the ejector seat; a piston which matches the tailstock body is arranged in the piston hole; and a piston which matches the tailstock body is arranged on the outer wall of the middle part of the piston. A ring-shaped sealing portion, the outer circumference of which is in contact with the inner wall of the piston hole; a piston rod is provided at the center of the right end face of the piston; a first oil inlet hole and a second oil inlet hole are provided on the right end face of the piston rod; a first oil passage is provided at the center of the bottom of the first oil inlet hole; a first oil outlet hole is provided on one side of the outer wall of the right part of the piston and is connected to the left end of the first oil passage; a second oil passage is provided on the left end face of the piston and is connected to the second oil inlet hole; a sealing cover matching the piston hole is provided at the right end opening of the piston hole; a sealing hole matching the piston rod is provided at the center of the sealing cover; a limiting structure matching the right end of the piston rod is provided at the right end opening of the movable hole.

[0007] The limiting structure includes a limiting end cover covering the right end opening of the moving hole; a plurality of first countersunk holes evenly distributed in a circumference are provided on the outer edge of the limiting end cover; a plurality of first screw holes intersecting the first countersunk holes are provided on the right side wall of the tailstock body; a limiting hole is provided in the center of the limiting end cover, and the right end of the piston rod passes through the limiting hole to the right and is screwed with a limiting sleeve that fits the right side wall of the limiting end cover; an annular limiting step is provided on the right part of the piston rod, and the limiting step fits the left side wall of the limiting end cover.

[0008] The left side wall of the sealing cover is fitted with the right end face of the ejector seat; the right end face of the ejector seat is provided with a plurality of second screw holes evenly distributed in a circumference; the outer edge of the right side wall of the sealing cover is provided with a plurality of second countersunk holes intersecting with the second screw holes; the inner wall of the sealing hole is provided with an annular inner sealing groove; the inner sealing groove is provided with an inner sealing ring matching with it.

[0009] An outer auxiliary ring is extended to the left from the outer edge of the left end face of the inner sealing ring. The outer auxiliary ring is in the shape of a trumpet that is wider on the left and narrower on the right. The outer wall of the left end of the outer auxiliary ring is pressed against the inner circumferential surface of the inner sealing groove; an inner auxiliary ring is extended to the left from the outer edge of the left end face of the inner sealing ring. The inner auxiliary ring is in the shape of a funnel that is narrow on the left and wide on the right. The inner wall of the left end of the inner sealing ring fits against the outer wall of the piston rod; the outer auxiliary ring, the inner auxiliary ring and the inner sealing ring enclose an annular outer expansion groove; the inner sealing ring, the outer auxiliary ring and the inner auxiliary ring are integrally formed and are all made of rubber.

[0010] An annular plug is extended to the left from the edge of the left end of the sealing hole to the outside of the piston rod; the inner wall of the annular plug is coplanar with the sealing hole and fits with the outer wall of the piston rod; the outer wall of the annular plug fits with the inner wall of the right end of the piston hole, and an annular external sealing groove is provided on the outer wall of the annular plug; an external sealing ring matching it is provided in the external sealing groove.

[0011] A left annular groove is provided on the left side of the outer wall of the sealing part; a left sealing ring matching with it is provided in the left annular groove; a right annular groove is provided on the right side of the outer wall of the sealing part; a right sealing ring matching with it is provided in the right annular groove.

[0012] A left auxiliary groove is provided on the left side wall of the left sealing ring, and the left auxiliary groove is in a trumpet shape that is wider on the left and narrower on the right; the left edge of the left annular groove is a ring-shaped left guide arc surface, and the left side of the left auxiliary groove is opposite to the left guide arc surface; a right auxiliary groove is provided on the right side wall of the right sealing ring, and the right auxiliary groove is in a trumpet shape that is narrower on the left and wider on the right; a ring-shaped right guide arc surface is provided on the right edge of the right annular groove, and the right side of the right auxiliary groove is opposite to the right guide arc surface; the left sealing ring and the right sealing ring are made of rubber.

[0013] The beneficial effects of the utility model are:

[0014] Compared with the prior art, the tailstock of the inner plug type CNC lathe adopting the structure of the utility model can realize the leftward movement of the ejector pin by injecting oil into the second oil channel through the second oil inlet hole, and can realize the rightward movement and resetting of the ejector pin by injecting oil into the second oil channel through the first oil inlet hole. The first oil channel and the second oil channel are both straight channels, and the processing is extremely simple, which can effectively improve the processing efficiency and reduce the processing cost. The first oil channel and the second oil channel are both arranged on the piston rod. Therefore, if the first oil channel and the second oil channel are damaged, it is only necessary to replace the piston rod and the piston without replacing the entire tailstock body, which effectively reduces the replacement cost. When replacing the piston rod and the piston, it is only necessary to remove the limit end cover and the sealing cover to quickly complete the replacement of the piston rod and the piston, which effectively improves the replacement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the tailstock of the inner plug type CNC lathe of the utility model;

[0016] Figure 2 yes Figure 1 An enlarged view of part A;

[0017] Figure 3 yes Figure 1 An enlarged view of part B;

[0018] Figure 4 It is a three-dimensional diagram of the piston rod;

[0019] Figure 5 It is a three-dimensional diagram of the inner sealing ring;

[0020] Figure 6 It is a structural schematic diagram of the tailstock of the inner plug type CNC lathe of the utility model;

[0021] Figure 7 It is a stereoscopic diagram of the tailstock of the inner plug type CNC lathe of the utility model. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] See also Figures 1 to 7 The utility model provides an inner plug type CNC lathe tailstock, comprising a tailstock body 1, a movable hole 2 which runs through the tailstock body 1 transversely is provided on the upper part of the tailstock body 1, a matching ejector seat 3 is provided in the movable hole 2, an ejector mounting hole 4 is provided in the center of the left end face of the ejector seat 3, an ejector 5 which matches the ejector mounting hole 4 is provided in the ejector mounting hole 4, a strip-shaped guide slide groove 6 is provided on the outer wall of the lower right side of the ejector seat 3, and the right end notch of the guide slide groove 6 is located on the right end face of the ejector seat 3; a guide screw hole 7 corresponding to the position of the guide slide groove 6 is provided on the inner wall of the lower middle part of the movable hole 2; a piston hole 8 is provided in the center of the right end face of the ejector seat 3; a piston 9 which matches the ejector seat 3 is provided in the piston hole 8; an annular sealing portion 1 is provided on the outer wall of the middle part of the piston 9 0, the outer peripheral surface of the sealing part 10 is in contact with the inner wall of the piston hole 8; a piston rod 11 is provided at the center of the right end face of the piston 9; a first oil inlet hole 12 and a second oil inlet hole 13 are provided on the right end face of the piston rod 11; a first oil path 14 is provided at the center of the bottom of the first oil inlet hole 12; a first oil outlet hole 15 is provided on one side of the outer wall of the right part of the piston 9 and is connected with the left end of the first oil path 14; a second oil path 16 is provided on the left end face of the piston 9 and is connected with the second oil inlet hole 13; a sealing cover 17 matching with it is provided at the right end opening of the piston hole 8; a sealing hole 18 matching with the piston rod 11 is provided at the center of the sealing cover 17; a limiting structure matching with the right end of the piston rod 11 is provided at the right end opening of the movable hole 2.

[0024] The limiting structure includes a limiting end cover 19 covering the right end opening of the moving hole 2; a plurality of first countersunk holes 20 evenly distributed in a circumference are provided on the outer edge of the limiting end cover 19; a plurality of first screw holes 21 intersecting the first countersunk holes 20 are provided on the right side wall of the tailstock body 1; a limiting hole 22 is provided at the center of the limiting end cover 19, and the right end of the piston rod 11 passes through the limiting hole 22 to the right and is screwed with a limiting sleeve 23 that fits the right side wall of the limiting end cover 19; an annular limiting step 24 is provided on the right part of the piston rod 11, and the limiting step 24 fits the left side wall of the limiting end cover 19.

[0025] The left side wall of the sealing cover 17 is fitted with the right end face of the ejector seat 3; the right end face of the ejector seat 3 is provided with a plurality of second screw holes 25 evenly distributed around the circumference; the outer edge of the right side wall of the sealing cover 17 is provided with a plurality of second countersunk holes 26 intersecting the second screw holes 25; the inner wall of the sealing hole 18 is provided with an annular inner sealing groove 27; the inner sealing groove 27 is provided with an inner sealing ring 28 matching it.

[0026] An outer auxiliary ring 29 is extended to the left from the outer edge of the left end face of the inner sealing ring 28. The outer auxiliary ring 29 is in the shape of a trumpet that is wider on the left and narrower on the right. The outer wall of the left end of the outer auxiliary ring 29 is pressed against the inner circumferential surface of the inner sealing groove 27; an inner auxiliary ring 30 is extended to the left from the outer edge of the left end face of the inner sealing ring 28. The inner auxiliary ring 30 is in the shape of a funnel that is narrow on the left and wide on the right. The inner wall of the left end of the inner sealing ring 28 is in contact with the outer wall of the piston rod 11; the outer auxiliary ring 29, the inner auxiliary ring 30 and the inner sealing ring 28 enclose an annular outer expansion groove 31; the inner sealing ring 28, the outer auxiliary ring 29 and the inner auxiliary ring 30 are integrally formed and are all made of rubber.

[0027] An annular plug 32 is extended to the left from the edge of the left end of the sealing hole 18 and is arranged outside the piston rod 11; the inner wall of the annular plug 32 is coplanar with the sealing hole 18 and fits with the outer wall of the piston rod 11; the outer wall of the annular plug 32 fits with the inner wall of the right end of the piston hole 8, and an annular external sealing groove 33 is provided on the outer wall of the annular plug 32; an external sealing ring 34 matching it is provided in the external sealing groove 33.

[0028] A left annular groove 35 is provided on the left side of the outer wall of the sealing part 10; a left sealing ring 36 matching therewith is provided in the left annular groove 35; a right annular groove 37 is provided on the right side of the outer wall of the sealing part 10; a right sealing ring 38 matching therewith is provided in the right annular groove 37.

[0029] A left auxiliary groove 39 is provided on the left side wall of the left sealing ring 36, and the left auxiliary groove 39 is in a trumpet shape that is wider on the left and narrower on the right; the left edge of the notch of the left annular groove 35 is a ring-shaped left guide arc surface 40, and the left notch of the left auxiliary groove 39 is opposite to the left guide arc surface 40; a right auxiliary groove 41 is provided on the right side wall of the right sealing ring 38, and the right auxiliary groove 41 is in a trumpet shape that is narrower on the left and wider on the right; a ring-shaped right guide arc surface 42 is provided on the right edge of the notch of the right annular groove 37, and the right notch of the right auxiliary groove 41 is opposite to the right guide arc surface 42; the left sealing ring 36 and the right sealing ring 38 are made of rubber.

[0030] The method of using the utility model is as follows:

[0031] Since the limiting step 24 on the piston rod 11 fits with the left side wall of the limiting end cover 19, the limiting end cover 19 can effectively limit the rightward movement of the piston rod 11, and the limiting sleeve 23 screwed to the outside of the right end of the piston rod 11 fits with the right side wall of the limiting end cover 19, the limiting end cover can effectively limit the leftward movement of the limiting sleeve 23, thereby limiting the leftward movement of the piston rod 11. When the piston rod 11 is restricted from moving left or right, the piston rod 11 remains fixed, thereby achieving the fixation of the piston 9.

[0032] The first oil inlet hole 12 and the second oil inlet hole 13 can be used to connect corresponding oil pipes to facilitate the input of hydraulic oil. When it is necessary to control the ejector pin 5 to move leftward to press the workpiece, the oil pipe connected to the second oil inlet hole 13 can be used to inject oil into the second oil inlet hole 13. At this time, the hydraulic oil will flow into the gap between the left end face of the piston 9 and the bottom of the piston hole 8 along the second oil passage 16. As the hydraulic oil entering the gap between the left end face of the piston 9 and the bottom of the piston hole 8 increases, the oil pressure in the gap between the left end face of the piston 9 and the bottom of the piston hole 8 increases accordingly. When the piston 9 is fixed, the oil pressure will squeeze the bottom of the piston hole 8 to the left, thereby realizing the leftward movement of the ejector pin seat 3 and finally realizing the leftward movement of the ejector pin 5. When the ejector pin seat 3 moves leftward, the sealing cover 17 fixing the right end face of the ejector pin seat 3 moves leftward synchronously.

[0033] When it is necessary to control the ejector pin 5 to move back to the right, the oil pipe connected to the second oil inlet hole 13 can be made to stop injecting oil into the second oil inlet hole 13. At this time, the oil pressure in the gap between the left end face of the piston 9 and the bottom of the piston hole 8 drops suddenly, and then the oil pipe connected to the first oil inlet hole 12 can be made to inject oil into the first oil inlet hole 12. At this moment, the hydraulic oil will flow toward the first oil outlet hole 15 through the first oil passage 14, and finally flow into the gap between the outer wall of the right part of the piston 9 and the inner wall of the piston hole 8 through the first oil outlet hole 15, while the outer peripheral surface of the sealing portion 10 fits with the inner wall of the piston hole 8, and the outer wall of the annular plug 32 fits with the right end opening of the piston hole 8. The inner walls fit together, and the inner wall of the annular plug 32 fits together with the outer wall of the piston rod 11. Therefore, the sealing part 10, the outer wall of the piston rod 11, the inner wall of the piston hole 8 and the left end face of the annular plug 32 can effectively enclose a closed oil chamber. As the hydraulic oil continues to flow into the gap between the right outer wall of the piston 9 and the inner wall of the piston hole 8, the oil chamber is finally filled, and the oil pressure in the oil chamber continues to rise. When the piston 9 is fixed, the oil pressure will squeeze the left end face of the annular plug 32 to the right, thereby realizing the rightward movement of the annular plug 32 and the sealing cover 17. At this time, the ejector seat 3 moves rightward synchronously with the sealing cover 17, thereby realizing the rightward movement and resetting of the ejector 5.

[0034] In summary, it can be known that the utility model can realize the leftward movement of the ejector pin 5 by injecting oil into the second oil passage 16 through the second oil inlet hole 13, and can realize the rightward movement and resetting of the ejector pin 5 by injecting oil into the second oil passage 16 through the first oil inlet hole 12. The first oil passage 14 and the second oil passage 16 are both straight passages, and the processing is extremely simple, thereby effectively improving the processing efficiency and reducing the processing cost. The first oil passage 14 and the second oil passage 16 are both arranged on the piston rod 11. Therefore, if the first oil passage 14 and the second oil passage 16 are damaged, it is only necessary to replace the piston rod 11 and the piston 9, and there is no need to replace the entire tailstock body 1, which effectively reduces the replacement cost. When replacing the piston rod 11 and the piston 9, it is only necessary to remove the limit end cover 19 and the sealing cover 17, so that the replacement of the piston rod 11 and the piston 9 can be completed quickly, effectively improving the replacement efficiency.

[0035] The limiting structure includes a limiting end cover 19 covering the right end opening of the moving hole 2. The outer edge of the limiting end cover 19 is provided with a plurality of first countersunk holes 20 evenly distributed in a circumference. The right side wall of the tailstock body 1 is provided with a plurality of first screw holes 21 intersecting the first countersunk holes 20. The fixing between the limiting end cover 19 and the tailstock body 1 can be achieved by passing the screw to the left through the first countersunk hole 20 and screwing it into the first screw hole 21. This fixing method is conducive to the disassembly and assembly of the limiting end cover 19, thereby facilitating the disassembly and assembly of other components.

[0036] The left side wall of the sealing cover 17 fits with the right end face of the ejector seat 3. The right end face of the ejector seat 3 is provided with a plurality of second screw holes 25 evenly distributed in a circumference. The outer edge of the right side wall of the sealing cover 17 is provided with a plurality of second countersunk holes 26 intersecting with the second screw holes 25. The sealing cover 17 and the ejector seat 3 can be fixed by simply passing the screws to the left through the second countersunk holes 26 and screwing them into the second screw holes 25. This fixing method is conducive to the disassembly and assembly of the sealing cover 17, thereby facilitating the maintenance and replacement of the sealing cover 17.

[0037] An annular inner sealing groove 27 is provided on the inner wall of the sealing hole 18; an inner sealing ring 28 matching it is provided in the inner sealing groove 27. The presence of the inner sealing ring 28 can effectively improve the sealing between the inner wall of the sealing hole 18 and the outer wall of the piston rod 11 to avoid oil leakage.

[0038] An outer auxiliary ring 29 extends to the left from the outer edge of the left end face of the inner sealing ring 28. The outer auxiliary ring 29 is in the shape of a trumpet with a width on the left and a width on the right. The outer wall of the left end of the outer auxiliary ring 29 is pressed against the inner circumference of the inner sealing groove 27. An inner auxiliary ring 30 extends to the left from the outer edge of the left end face of the inner sealing ring 28. The inner auxiliary ring 30 is in the shape of a funnel with a narrow width on the left and a width on the right. The inner wall of the left end of the inner sealing ring 28 fits the outer wall of the piston rod 11. The outer auxiliary ring 29, the inner auxiliary ring 30 and the inner sealing ring 28 enclose an annular outer expansion groove 31. The inner sealing ring 28, the outer auxiliary ring 29 and the inner auxiliary ring 30 are integrally formed and are all made of rubber. When hydraulic oil passes through the inner wall of the sealing hole 18 and the outer wall of the piston rod 11, the outer auxiliary ring 29, the inner auxiliary ring 30 and the inner sealing ring 28 are pressed against the inner circumference of the inner sealing groove 27. When the gap between the walls leaks to the right, it will first leak into the gap between the left side wall of the inner sealing ring 28 and the left groove wall of the inner sealing groove 27, and then enter into the outer expansion groove 31. As the hydraulic oil continues to enter the outer expansion groove, the oil pressure in the outer expansion groove 31 will continue to rise, thereby squeezing the groove wall of the outer expansion groove 31 outward. At this time, the outer wall of the left end of the outer auxiliary ring 29 is compressed and further squeezed on the inner circumferential surface of the inner sealing groove 27, and the inner wall of the left end of the inner auxiliary ring 30 is compressed and further squeezed on the outer wall of the piston rod 11, which further improves the sealing effect and avoids the hydraulic oil from leaking to the right through the gap between the inner wall of the sealing hole 18 and the outer wall of the piston rod 11 to the greatest extent.

[0039] A set of annular plugs 32 on the outside of the piston rod 11 extends to the left from the edge of the left end of the sealing hole 18. The inner wall of the annular plug 32 is coplanar with the sealing hole 18 and fits with the outer wall of the piston rod 11. The outer wall of the annular plug 32 fits with the inner wall of the right end of the piston hole 8. The outer wall of the annular plug 32 is provided with an annular outer sealing groove 33, and the outer sealing groove 33 is provided with an outer sealing ring 34 matching therewith. The presence of the annular plug 32 can increase the actual sealing area of ​​the sealing cover 17 in disguised form, effectively improving the sealing effect, and the presence of the outer sealing ring 34 can further improve the sealing between the outer wall of the annular plug 32 and the inner wall of the piston hole 8.

[0040] An annular sealing portion 10 is provided on the outer wall of the middle part of the piston 9, and the outer peripheral surface of the sealing portion 10 is fitted with the inner wall of the piston hole 8. A left annular groove 35 is provided on the left side of the outer wall of the sealing portion 10, and a left sealing ring 36 matching therewith is provided in the left annular groove 35. An annular right annular groove 37 is provided on the right side of the outer wall of the sealing portion 10, and a right sealing ring 38 matching therewith is provided in the right annular groove 37. The existence of the left sealing ring 36 and the right sealing ring 38 can effectively improve the sealing between the outer peripheral surface of the sealing portion 10 and the inner wall of the piston hole 8, effectively avoid oil leakage, thereby avoiding the situation where unstable oil pressure affects the movement of the ejector pin 5.

[0041] A left auxiliary groove 39 is provided on the left side wall of the left sealing ring 36. The left auxiliary groove 39 is in a trumpet shape that is wide on the left and narrow on the right. The left edge of the notch of the left annular groove 35 is an annular left guide arc surface 40. The left notch of the left auxiliary groove 39 is opposite to the left guide arc surface 40. When the hydraulic oil enters the gap between the left end face of the piston 9 and the bottom of the piston hole 8 through the second oil inlet hole 13, it can only leak to the right through the gap between the outer peripheral surface of the sealing part 10 and the inner wall of the piston hole 8. However, at this time, the left guide arc surface 40 Under the guidance, the hydraulic oil will directly enter the left auxiliary groove 39 through the left notch of the left auxiliary groove 39. As the hydraulic oil continues to flow into the left auxiliary groove 39, the oil pressure in the left auxiliary groove 39 continues to rise. At this time, the oil pressure squeezes the groove wall of the left auxiliary groove 39, and the left sealing ring 36 is deformed accordingly. The outer circumferential surface of the left sealing ring 36 further fits on the inner wall of the piston hole 8, and the inner circumferential surface of the left sealing ring 36 further fits on the inner circumferential surface of the left annular groove 35, effectively ensuring the sealing effect of the left sealing ring 36.

[0042] A right auxiliary groove 41 is provided on the right side wall of the right sealing ring 38. The right auxiliary groove 41 is in a trumpet shape that is narrow on the left and wide on the right. A right guide arc surface 42 is provided on the right edge of the notch of the right annular groove 37. The right notch of the right auxiliary groove 41 is opposite to the right guide arc surface 42. When the hydraulic oil enters the sealed oil chamber formed by the sealing part 10, the outer wall of the piston rod 11, the inner wall of the piston hole 8 and the left end face of the annular plug 32 through the first oil outlet 15, a part of the hydraulic oil will try to pass through the outer peripheral surface of the sealing part 10 and the piston rod 11 under the action of the oil pressure. The gap between the inner walls of the plug hole 8 leaks to the left. At this time, the hydraulic oil, under the guidance of the right guide arc surface 42, will directly enter the right auxiliary groove 41 through the right side notch of the right auxiliary groove 41. As the oil pressure in the right auxiliary groove 41 continues to rise, the oil pressure will squeeze the groove wall of the right auxiliary groove 41 outward. At this time, the right sealing ring 38 is deformed, and the outer peripheral surface of the right sealing ring 38 further fits on the inner wall of the piston hole 8, and the inner peripheral surface of the right sealing ring 38 further fits with the inner wall of the right annular groove 37, effectively ensuring the sealing effect of the right sealing ring 38.

[0043] A strip-shaped guide slot 6 is provided on the lower outer wall of the right part of the ejector seat 3, and the right end notch of the guide slot 6 is located on the right end surface of the ejector seat 3. A guide screw hole 7 corresponding to the position of the guide slot 6 is provided on the lower inner wall of the middle part of the moving hole 2. It only needs to thread a screw into the guide screw hole 7 and make the head of the screw located in the guide slot 6. The screw can guide the ejector seat 3, so that the ejector 5 can be stably translated.

Claims

1. An inner plug type CNC lathe tailstock, comprising a tailstock body, a movable hole which runs through the tailstock body laterally on the upper part, an ejector seat which matches the tailstock body is arranged in the movable hole, an ejector mounting hole is arranged in the center of the left end face of the ejector seat, an ejector which matches the tailstock body is arranged in the ejector mounting hole, and the characteristics are: The outer wall of the lower right side of the ejector seat is provided with a strip-shaped guide slot, and the notch at the right end of the guide slot is located on the right end surface of the ejector seat; the inner wall of the lower middle part of the moving hole is provided with a guide screw hole corresponding to the position of the guide slot; a piston hole is provided at the center of the right end surface of the ejector seat; a piston matching it is provided in the piston hole; an annular sealing portion is provided on the outer wall of the middle part of the piston, and the outer peripheral surface of the sealing portion is in contact with the inner wall of the piston hole; a piston rod is provided at the center of the right end surface of the piston; a first oil inlet hole and a second oil inlet hole are provided on the right end surface of the piston rod; a first oil passage is provided at the center of the bottom of the first oil inlet hole; a first oil outlet hole is provided on one side of the outer wall of the right part of the piston, which is connected to the left end of the first oil passage; a second oil passage is provided on the left end surface of the piston, which is connected to the second oil inlet hole; a sealing cover is provided at the right end of the piston hole; a sealing hole matching the piston rod is provided at the center of the sealing cover; a limiting structure matching the right end of the piston rod is provided at the right end of the moving hole.

2. The inner plug type CNC lathe tailstock according to claim 1, characterized in that: The limiting structure includes a limiting end cover covering the right end opening of the moving hole; a plurality of first countersunk holes evenly distributed in a circumference are provided on the outer edge of the limiting end cover; a plurality of first screw holes intersecting the first countersunk holes are provided on the right side wall of the tailstock body; a limiting hole is provided in the center of the limiting end cover, and the right end of the piston rod passes through the limiting hole to the right and is screwed with a limiting sleeve that fits the right side wall of the limiting end cover; an annular limiting step is provided on the right part of the piston rod, and the limiting step fits the left side wall of the limiting end cover.

3. The inner plug type CNC lathe tailstock according to claim 1, characterized in that: The left side wall of the sealing cover is fitted with the right end face of the ejector seat; the right end face of the ejector seat is provided with a plurality of second screw holes evenly distributed in a circumference; the outer edge of the right side wall of the sealing cover is provided with a plurality of second countersunk holes intersecting with the second screw holes; the inner wall of the sealing hole is provided with an annular inner sealing groove; the inner sealing groove is provided with an inner sealing ring matching with it.

4. The inner plug type CNC lathe tailstock according to claim 3, characterized in that: An outer auxiliary ring is extended to the left from the outer edge of the left end face of the inner sealing ring. The outer auxiliary ring is in the shape of a trumpet that is wider on the left and narrower on the right. The outer wall of the left end of the outer auxiliary ring is pressed against the inner circumferential surface of the inner sealing groove; an inner auxiliary ring is extended to the left from the outer edge of the left end face of the inner sealing ring. The inner auxiliary ring is in the shape of a funnel that is narrow on the left and wide on the right. The inner wall of the left end of the inner sealing ring fits against the outer wall of the piston rod; the outer auxiliary ring, the inner auxiliary ring and the inner sealing ring enclose an annular outer expansion groove; the inner sealing ring, the outer auxiliary ring and the inner auxiliary ring are integrally formed and are all made of rubber.

5. The inner plug type CNC lathe tailstock according to claim 3, characterized in that: An annular plug is extended to the left from the edge of the left end of the sealing hole to the outside of the piston rod; the inner wall of the annular plug is coplanar with the sealing hole and fits with the outer wall of the piston rod; the outer wall of the annular plug fits with the inner wall of the right end of the piston hole, and an annular external sealing groove is provided on the outer wall of the annular plug; an external sealing ring matching it is provided in the external sealing groove.

6. The inner plug type CNC lathe tailstock according to claim 1, characterized in that: A left annular groove is provided on the left side of the outer wall of the sealing part; a left sealing ring matching with it is provided in the left annular groove; a right annular groove is provided on the right side of the outer wall of the sealing part; a right sealing ring matching with it is provided in the right annular groove.

7. The inner plug type CNC lathe tailstock according to claim 6, characterized in that: A left auxiliary groove is provided on the left side wall of the left sealing ring, and the left auxiliary groove is in a trumpet shape that is wider on the left and narrower on the right; the left edge of the left annular groove is a ring-shaped left guide arc surface, and the left side of the left auxiliary groove is opposite to the left guide arc surface; a right auxiliary groove is provided on the right side wall of the right sealing ring, and the right auxiliary groove is in a trumpet shape that is narrower on the left and wider on the right; a ring-shaped right guide arc surface is provided on the right edge of the right annular groove, and the right side of the right auxiliary groove is opposite to the right guide arc surface; the left sealing ring and the right sealing ring are made of rubber.

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