Intermediate drive main shaft piston clearance eliminating structure

Abstract

The invention relates to a clearance eliminating structure for a piston of a middle driving main shaft. The technical problem that gaps are generated after an existing piston shaft core moves is solved. Comprising a main shaft base, the main shaft base is provided with a static pressure shaft sleeve, a rotating shaft core is arranged on the circumferential inner side of the static pressure shaft sleeve, a hydraulic chuck mechanism is arranged on the circumferential inner side of the rotating shaft core and provided with an oil cylinder piston shaft core and a chuck assembly, and a radial static pressure bearing is arranged on the circumferential outer side of the oil cylinder piston shaft core. A chuck clamping rotary oil inlet mechanism and a chuck releasing rotary oil inlet mechanism are arranged among the main shaft base, the static pressure shaft sleeve, the rotary shaft core and the oil cylinder piston shaft core, wherein the chuck clamping rotary oil inlet mechanism can drive the chuck assembly to clamp a workpiece and can be communicated with the radial static pressure bearing, and the chuck releasing rotary oil inlet mechanism can drive the chuck assembly to release the workpiece. The hydraulic chuck mechanism has the advantages that the chuck clamping rotary oil inlet mechanism can enable the hydraulic chuck mechanism to clamp a workpiece, the clamping oil cavity can push the annular pushing part to move, a gap between an oil cylinder piston shaft core and a main shaft is eliminated, and the clamping precision is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing equipment, and in particular relates to a clearance eliminating structure for a central driving spindle piston. Background Art

[0002] In modern industrial manufacturing, the drive spindle is the core component of many mechanical equipment. Its performance directly affects the operating accuracy of the equipment. Especially in high-precision equipment such as precision lathes and machining centers, the precise operation of the drive spindle is the key to ensuring product quality. In the common drive spindle structure, the piston shaft core undertakes the important tasks of power transmission and motion control. During operation, the piston shaft core needs to move according to the instructions to meet the processing and mechanical action requirements, but after the displacement, there will be a gap with the surrounding parts. This gap seriously threatens the operating accuracy of the equipment. During precision machining, it will cause uneven clamping force, displacement or shaking of the workpiece, resulting in machining dimensional deviation and increased surface roughness. In terms of rotational accuracy, the gap causes irregular movements such as spindle jumping and swinging, which reduces machining accuracy, accelerates component wear, shortens equipment life, and increases maintenance costs. Summary of the invention

[0003] The object of the present invention is to provide a mid-drive spindle piston clearance eliminating structure in view of the above problems.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a structure for eliminating the gap of a driving spindle piston in the present invention comprises a spindle base, a hydrostatic sleeve is fixedly provided on the inner side of the spindle base in the circumferential direction, a rotating shaft core is rotatably provided on the inner side of the hydrostatic sleeve in the circumferential direction, a hydraulic chuck mechanism is provided on the inner side of the rotating shaft core in the circumferential direction, the hydraulic chuck mechanism comprises an oil cylinder piston shaft core and a chuck assembly for clamping a workpiece, a radial hydrostatic bearing is provided on the outer side of the oil cylinder piston shaft core, and an energy A chuck clamping rotating oil supply mechanism that drives the chuck assembly to clamp the workpiece and can be connected to the radial static pressure bearing at the same time, and a chuck releasing rotating oil supply mechanism that can drive the chuck assembly to release the workpiece. The chuck clamping rotating oil supply mechanism can make the hydraulic chuck mechanism supply oil and enable the chuck assembly to maintain the clamping effect on the workpiece, and can eliminate the gap between the oil cylinder piston shaft core and the oil cylinder through oil pressure, thereby improving the clamping accuracy and ensuring the clamping stability. The chuck releasing rotating oil supply mechanism can make the chuck assembly loosen the workpiece and reset the oil cylinder piston shaft core, thereby improving the processing efficiency.

[0005] In the above-mentioned structure for eliminating the gap of the driving spindle piston, the rotating shaft core and the cylinder piston shaft core are both cylindrical, and one end of the rotating shaft core has an shaft core annular connecting portion extending to the outside of the end face of one end of the static pressure sleeve, and the shaft core annular connecting portion is fixedly connected to the pulley body which is sleeved on the circumferential outside of one end of the cylinder piston shaft core, and an annular pushing portion is provided on the circumferential outside of the middle part of the cylinder piston shaft core, and one end of the cylinder piston shaft core extends to the circumferential inner side of one end of the rotating shaft core having the shaft core annular connecting portion, and the cylinder piston shaft core is penetrated on the circumferential inner side of the pulley body, and can be easily connected to the pulley body through the shaft core annular connecting portion, and the pulley body is driven by a belt to drive the shaft core annular connecting portion to rotate, and can be displaced under the action of oil pressure during the clamping process through the annular pushing portion, thereby eliminating the gap between the cylinder piston shaft core and the cylinder, improving the clamping accuracy, and being able to automatically reset by oil pressure, thereby improving processing efficiency.

[0006] In the above-mentioned structure for eliminating the gap of the driving spindle piston, the number of the radial static pressure bearings is two, which are respectively a first radial static pressure bearing and a second radial static pressure bearing located on both sides of the annular pushing portion. The first radial static pressure bearing is arranged between the circumferential inner side of the pulley body and the circumferential outer side of one end of the cylinder piston shaft core, and the second radial static pressure bearing is arranged between the circumferential outer side of the other end of the cylinder piston shaft core and the circumferential inner side of one end of the rotating shaft core having the shaft core annular connecting portion. The friction between the cylinder piston shaft core and the pulley body can be reduced by the first radial static pressure bearing, and the friction between the rotating shaft core and the cylinder piston shaft core can be reduced by the second radial static pressure bearing, and the rotating shaft core can be positioned and supported to ensure the relative position accuracy of the rotating shaft core and the cylinder piston shaft core.

[0007] In the above-mentioned structure for eliminating the gap of the driving spindle piston, the chuck assembly includes two symmetrically arranged rubber chucks, the rubber chucks are both conical cylindrical and the corresponding ends of the two rubber chucks are respectively clamped with the collar pull tube to realize the linkage of the two rubber chucks, the rubber chucks have conical surfaces on the circumferential outer sides and clamping channels on the circumferential inner sides for clamping the workpiece, and the outer conical surfaces of the two rubber chucks are symmetrically arranged and inclined upward toward the two ends of the spindle base respectively. The collar pull tube can make it easy to control the clamping of the other rubber chuck when one of the rubber chucks clamps the workpiece, thereby improving the processing efficiency and ensuring the clamping effect. The conical surface can facilitate the linkage with the oil cylinder piston shaft core, facilitate the control of the working state of the rubber chuck, and facilitate the placement of the workpiece through the support channel.

[0008] In the above-mentioned structure for eliminating the gap of the driving spindle piston, the inner side of the middle part of the oil cylinder piston shaft core has a chuck action part corresponding to the inner and outer sides of the annular pushing part and sleeved on the outer side of one of the rubber chucks, and the chuck action part has a first conical surface in contact with the outer conical surface of the rubber chuck, and the circumferential inner side of one end of the rotating shaft core away from the shaft core annular connecting part is provided with a second conical surface sleeved on the remaining chuck pushing ring and the inner side of the chuck pushing ring has a second conical surface in contact with the outer conical surface of the rubber chuck, and the chuck action part can enable the oil cylinder piston shaft core to push the rubber chuck to clamp the workpiece through the first conical surface when in the clamping state, and can drive the other rubber chuck to clamp through the sleeve ring pull tube, and can guide the other rubber chuck through the chuck pushing ring and the second conical surface to ensure the clamping effect of the rubber chuck.

[0009] In the above-mentioned structure for eliminating the clearance of the driving spindle piston, the chuck clamping and rotating oil supply mechanism includes a clamping oil supply channel arranged at the bottom of the spindle base, the clamping oil supply channel is connected to the clamping oil supply channel located in the rotating shaft core through a plurality of clamping oil supply holes radially penetrating the hydrostatic sleeve, the clamping oil supply channel is connected to the second radial hydrostatic bearing and / or the clamping oil outlet channel located in the oil cylinder piston shaft core, and the clamping oil outlet channel is respectively connected to the first radial hydrostatic bearing and the clamping oil chamber located between the annular push part and the second radial hydrostatic bearing, the clamping oil enters through the clamping oil supply channel, and the clamping oil can be easily introduced into the clamping oil supply channel through the clamping oil supply hole, the hydraulic oil in the clamping oil supply channel can supply oil to the second radial hydrostatic bearing and the clamping oil outlet channel, and the first radial hydrostatic bearing and the clamping oil chamber can be supplied with oil through the clamping oil outlet channel, the hydraulic oil in the clamping oil chamber can push the annular push part to displace, the clearance can be eliminated, and the clamping accuracy can be improved.

[0010] In the above-mentioned structure for eliminating the gap of the driving spindle piston, the clamping oil delivery holes are evenly distributed in the circumference, the clamping oil delivery channel is axially extended along the rotating shaft core, one end of the clamping oil delivery channel is connected to the second radial static pressure bearing, and the middle part of the clamping oil delivery channel is connected to the clamping oil outlet channel, and the clamping oil outlet channel is axially extended along the oil cylinder piston shaft core, and one end of the clamping oil outlet channel is respectively connected to the first radial static pressure bearing and the clamping oil chamber, and the axially arranged clamping oil delivery channel can facilitate the oil supply to the second radial static pressure bearing and the clamping oil outlet channel, and the oil supply effect to the second static pressure bearing and the clamping oil chamber can be guaranteed by the clamping oil outlet channel, and the clamping effect can be guaranteed by the clamping oil chamber, and the gap of the oil cylinder piston shaft core can be reduced, thereby improving the clamping accuracy.

[0011] In the above-mentioned structure for eliminating the gap of the driving spindle piston, the chuck release rotation oil supply mechanism includes a release oil supply channel arranged at the bottom of the spindle base, the release oil supply channel is connected to the release oil supply channel located in the rotating shaft core through a plurality of release oil supply holes radially penetrating the hydrostatic sleeve, the release oil supply channel is connected to the release oil outlet channel located in the oil cylinder piston shaft core, and the release oil outlet channel is connected to the release oil chamber located between the annular push part and the first radial hydrostatic bearing.

[0012] In the above-mentioned structure for eliminating the clearance of the driving spindle piston, the release oil delivery holes are evenly distributed in the circumference, the release oil delivery channel is axially extended along the rotating shaft core, and the middle part of the release oil delivery channel is connected with the release oil outlet channel, and the release oil outlet channel is axially extended along the oil cylinder piston shaft core, and one end of the release oil outlet channel is bent and connected with the release oil chamber, and the release hydraulic oil enters the release oil inlet channel, and the release oil can be easily introduced into the release oil delivery channel through the release oil delivery hole, and the hydraulic oil in the release oil delivery channel can be used to supply oil to the release oil outlet channel, and the annular push part can be pushed by the hydraulic oil through the release oil chamber connected to the release oil channel, so as to drive the annular push part to reset and enable the rubber chuck to release the workpiece.

[0013] In the above-mentioned structure for eliminating the gap of the driving spindle piston, a driving oil inlet is provided at the bottom of the spindle base, and the driving oil inlet is connected to a driving oil delivery channel axially arranged on a hydrostatic sleeve, and both ends of the driving oil delivery channel are respectively connected to the circumferential outer sides of both ends of the rotating shaft core, and oil can be supplied between the rotating shaft core and the hydrostatic sleeve through the driving oil inlet and the driving oil delivery channel, which can effectively reduce friction and increase service life.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] 1. The hydraulic chuck mechanism can clamp the workpiece by the chuck clamping and rotating oil inlet mechanism to ensure the clamping effect. The clamping oil chamber can push the annular push part to move, eliminate the gap between the oil cylinder piston shaft core and the spindle, ensure the clamping accuracy and ensure the high rotation accuracy of the mid-drive spindle.

[0016] 2. The rotating oil inlet mechanism released by the chuck can facilitate the release of the workpiece and can drive the cylinder piston axis to self-reset, thereby improving processing efficiency.

[0017] 3. The two rubber chucks can clamp the workpiece through the ring pull tube, which improves the clamping efficiency and ensures the clamping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a structural schematic diagram of the present invention.

[0019] Figure 2 It is a structural cross-sectional view of the rotating shaft core in the present invention.

[0020] Figure 3 It is a structural cross-sectional view of the present invention.

[0021] Figure 4 It is a structural sectional view of the chuck clamping and rotating oil feeding mechanism in the present invention.

[0022] Figure 5 It is a structural cross-sectional view of the chuck release rotation oil feeding mechanism in the present invention.

[0023] In the figure: spindle base 1, drive oil inlet 11, static pressure sleeve 2, drive oil delivery channel 21, rotating shaft core 3, shaft core annular connecting part 31, pulley body 32, chuck push ring 33, second cone surface 34, hydraulic chuck mechanism 4, cylinder piston shaft core 41, annular push part 411, chuck action part 412, first cone surface 413, chuck assembly 42, rubber chuck 421, cone surface 422, clamping channel 423, radial static pressure Bearing 43, first radial static pressure bearing 431, second radial static pressure bearing 432, workpiece 5, chuck clamping rotating oil supply mechanism 6, clamping oil supply channel 61, clamping oil delivery hole 62, clamping oil delivery channel 63, clamping oil outlet channel 64, clamping oil chamber 65, chuck release rotating oil supply mechanism 7, release oil supply channel 71, release oil delivery hole 72, release oil delivery channel 73, release oil outlet channel 74, release oil chamber 75, collar pulling tube 8. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, a structure for eliminating the gap of a driving spindle piston in the present invention comprises a spindle base 1, a hydrostatic sleeve 2 is fixedly provided on the circumferential inner side of the spindle base 1, a rotating shaft core 3 is rotatably provided on the circumferential inner side of the hydrostatic sleeve 2, a pressure oil film can be formed between the circumferential outer side of the rotating shaft core 3 and the hydrostatic sleeve 2 through the hydrostatic sleeve 2, the pressure oil film can facilitate the stable rotation of the rotating shaft core 3, reduce the friction between the rotating shaft core 3 and the hydrostatic sleeve 2, and improve the service life of the rotating shaft core 3, a hydraulic chuck mechanism 4 is provided on the circumferential inner side of the rotating shaft core 3, the hydraulic chuck mechanism 4 has an oil cylinder piston shaft core 41 and a chuck assembly 42 for clamping a workpiece 5, wherein a first sealing ring is provided on one side of the spindle base 1 to seal and abut against the connection between the spindle base 1 and the hydrostatic bearing 2, and a second sealing ring is provided on the circumferential inner side of the first sealing ring to seal and fix with the side of the rotating shaft core 3 and the hydraulic chuck mechanism 4, wherein a sealing ring is provided at the connection between the first sealing ring and the second sealing ring, through the first The sealing ring and the second sealing ring can improve the sealing effect of the main shaft. The chuck assembly 42 can facilitate the placement and clamping of the workpiece 5 to ensure the clamping effect of the workpiece 5. A radial static pressure bearing 43 is arranged on the circumferential outer side of the cylinder piston shaft core 41. A chuck clamping rotating oil supply mechanism 6 that can drive the chuck assembly 42 to clamp the workpiece 5 and can be connected to the radial static pressure bearing 43 at the same time and a chuck releasing rotating oil supply mechanism 7 that can drive the chuck assembly 42 to release the workpiece 5 are arranged between the spindle base 1, the static pressure sleeve 2, the rotating shaft core 3 and the cylinder piston shaft core 41. The chuck clamping rotating oil supply mechanism 6 can make the hydraulic chuck mechanism 4 supply oil and make the chuck assembly 42 maintain the clamping effect on the workpiece 5, and can eliminate the gap between the cylinder piston shaft core 41 and the cylinder through oil pressure, thereby improving the clamping accuracy and ensuring the clamping stability. The chuck releasing rotating oil supply mechanism 7 can make the chuck assembly 42 release the workpiece and reset the cylinder piston shaft core 41, thereby improving the processing efficiency.

[0026] Specifically, the rotating shaft core 3 and the cylinder piston shaft core 41 are both cylindrical, and one end of the rotating shaft core 3 has an shaft core annular connecting portion 31 extending to the outside of the end surface of one end of the hydrostatic sleeve 2, and the shaft core annular connecting portion 31 is fixedly connected to the pulley body 32 sleeved on the circumferential outside of one end of the cylinder piston shaft core 41, wherein the other side of the pulley body 32 is fixedly provided with a rotating flange, and the circumferential inner side of the rotating flange is sleeved on the hydrostatic bearing 43, and the rotating flange and the circumferential outer side of the pulley body 32 are provided with a sealing cover, one side of the sealing cover is abutted against the main shaft base 1 through an abutting ring, and a sealing ring is provided between the side of the sealing cover and the rotating flange, and a rotating gap is provided between the circumferential inner side of the sealing cover and the pulley body 32, and the rotating gap can facilitate the belt to rotate on the pulley body 32, and the main The shaft base 1 has a connecting cover on the side facing the pulley body 32, which is sleeved on the circumferential outer side of the sealing cover, and an annular pushing portion 411 is provided on the circumferential outer side of the middle part of the cylinder piston shaft core 41. One end of the cylinder piston shaft core 41 extends to the circumferential inner side of one end of the rotating shaft core 3 having the shaft core annular connecting portion 31, and the cylinder piston shaft core 41 is penetrated through the circumferential inner side of the pulley body 32, and can be easily connected to the pulley body 32 through the shaft core annular connecting portion 31, and the pulley body 32 is driven by a belt to drive the shaft core annular connecting portion 31 to rotate, and can be displaced under the action of oil pressure during the clamping process through the annular pushing portion 411, thereby eliminating the gap between the cylinder piston shaft core 41 and the oil cylinder, improving the clamping accuracy, and can be automatically reset by oil pressure to improve processing efficiency.

[0027] Among them, the number of radial static pressure bearings 43 is two, which are respectively located on both sides of the annular pushing portion 411, the first radial static pressure bearing 431 and the second radial static pressure bearing 432. The first radial static pressure bearing 431 is arranged between the circumferential inner side of the pulley body 32 and the circumferential outer side of one end of the cylinder piston shaft core 41, and the second radial static pressure bearing 432 is arranged between the circumferential outer side of the other end of the cylinder piston shaft core 41 and the circumferential inner side of one end of the rotating shaft core 3 having the shaft core annular connecting portion 31. The first radial static pressure bearing 431 can reduce the friction between the cylinder piston shaft core 41 and the pulley body 32, and the second radial static pressure bearing 432 can reduce the friction between the rotating shaft core 3 and the cylinder piston shaft core 41, and the rotating shaft core 3 can be positioned and supported to ensure the relative position accuracy of the rotating shaft core 3 and the cylinder piston shaft core 41.

[0028] like Figure 3 , Figure 4As shown, the clamp assembly 42 includes two symmetrically arranged rubber clamps 421. The rubber clamps 421 can be used for objects of different shapes and sizes, and are not easy to damage the clamped objects. They have a good anti-slip effect, ensuring that the clamped objects will not fall off easily during the processing. The rubber clamps 421 are all conical and cylindrical, and the corresponding ends of the two rubber clamps 421 are respectively connected with the ring pull tube 8 to realize the linkage of the two rubber clamps 421. The rubber clamps 421 have conical surfaces 422 on the outer side of the circumference and have conical surfaces 422 on the inner side of the circumference for clamping. The clamping channel 423 of the workpiece 5, and the outer conical surfaces of the two rubber chucks 421 are symmetrically arranged and inclined upward toward the two ends of the spindle base 1 respectively. Through the ring pull tube 8, when one of the rubber chucks 421 is clamping the workpiece, it is convenient to control the clamping of the other rubber chuck 421, thereby improving the processing efficiency and ensuring the clamping effect. Through the conical surface 422, it is convenient to link with the cylinder piston shaft core 41, so as to control the working state of the rubber chuck 421, and through the supporting channel 423, it is convenient to place the workpiece 5.

[0029] Furthermore, a chuck action portion 412 is provided on the inner side of the middle part of the oil cylinder piston shaft core 41, which corresponds to the inner and outer sides of the annular pushing portion 411 and is sleeved on the outer side of one of the rubber chucks 421, and the chuck action portion 412 has a first tapered surface 413 in contact with the outer tapered surface of the rubber chuck 421. The circumferential inner side of one end of the rotating shaft core 3 away from the shaft core annular connecting portion 31 is provided with a second tapered surface 34 sleeved on the remaining chuck pushing ring 33 and the inner side of the chuck pushing ring 33 has a contact with the outer tapered surface of the rubber chuck 421. The chuck action portion 412 can enable the oil cylinder piston shaft core 41 to push the rubber chuck 421 to clamp the workpiece 5 through the first tapered surface 413 when in a clamped state, and can drive the other rubber chuck 421 to clamp through the sleeve pull tube 8, and can guide the other rubber chuck 421 through the chuck pushing ring 33 and the second tapered surface 34 to ensure the clamping effect of the rubber chuck 421.

[0030] The chuck clamping and rotating oil inlet mechanism 6 includes a clamping oil inlet channel 61 arranged at the bottom of the spindle base 1, and the clamping oil inlet channel 61 is connected to the clamping oil delivery channel 63 located in the rotating shaft core 3 through a plurality of clamping oil delivery holes 62 radially penetrating the hydrostatic sleeve 2, and the clamping oil delivery channel 63 is connected to the second radial hydrostatic bearing 432 and / or the clamping oil outlet channel 64 located in the cylinder piston shaft core 41, and the clamping oil outlet channel 64 is respectively connected to the first radial hydrostatic bearing 431 and the one located between the annular push portion 411 and the second radial hydrostatic bearing 432. The clamping oil chamber 65 is connected, and the clamping oil enters through the clamping oil inlet channel 61, and the clamping oil can be easily introduced into the clamping oil delivery channel 63 through the clamping oil delivery hole 62. The hydraulic oil in the clamping oil delivery channel 63 can supply oil to the second radial static pressure bearing 432 and the clamping oil outlet channel 64, and the first radial static pressure bearing 431 can be supplied with oil through the clamping oil outlet channel 64 and the clamping oil chamber 65 can be supplied with oil. The hydraulic oil in the clamping oil chamber 65 can push the annular pushing part 411 to move, eliminate the gap, and improve the clamping accuracy.

[0031] Combination Figure 3 , Figure 4 , Figure 5 As shown, the clamping oil delivery holes 62 are evenly distributed circumferentially, the clamping oil delivery channel 63 is axially extended along the rotating shaft core 3, one end of the clamping oil delivery channel 63 is connected to the second radial static pressure bearing 432, and the middle part of the clamping oil delivery channel 63 is connected to the clamping oil outlet channel 64, and the clamping oil outlet channel 64 is axially extended along the cylinder piston shaft core 41, and one end of the clamping oil outlet channel 64 is respectively connected to the first radial static pressure bearing 431 and the clamping oil chamber 65, and the axially arranged clamping oil delivery channel 63 can facilitate the oil supply to the second radial static pressure bearing 432 and the clamping oil outlet channel 64, and the oil supply effect to the second static pressure bearing 432 and the clamping oil chamber 65 can be guaranteed by the clamping oil outlet channel 64, and the clamping effect can be guaranteed by the clamping oil chamber 65, and the clearance of the cylinder piston shaft core 41 can be reduced, thereby improving the clamping accuracy.

[0032] Among them, the chuck release rotation oil supply mechanism 7 includes a release oil supply channel 71 arranged at the bottom of the spindle base 1, and the release oil supply channel 71 is connected to the release oil supply channel 73 located in the rotating shaft core 3 through a plurality of release oil supply holes 72 radially penetrating the hydrostatic sleeve 2, and the release oil supply channel 73 is connected to the release oil outlet channel 74 located in the oil cylinder piston shaft core 41, and the release oil outlet channel 74 is connected to the release oil chamber 75 located between the annular push part 411 and the first radial hydrostatic bearing 431, and the release hydraulic oil enters through the release oil supply channel 71, and the release oil can be easily introduced into the release oil supply channel 73 through the release oil supply hole 72, and the hydraulic oil in the release oil supply channel 73 can supply oil to the release oil outlet channel 74, and the annular push part 411 can be pushed by the hydraulic oil through the release oil chamber 75 connected to the release oil outlet channel 74, so as to drive the annular push part 411 to reset and enable the rubber chuck 421 to release the workpiece 5.

[0033] Specifically, the release oil holes 72 are evenly distributed circumferentially, the release oil channel 73 is axially extended along the rotating shaft core 3, and the middle part of the release oil channel 73 is connected with the release oil channel 74, and the release oil channel 74 is axially extended along the cylinder piston shaft core 41, and one end of the release oil channel 74 is bent and connected with the release oil chamber 75.

[0034] Combination Figure 1 , Figure 2 , Figure 3 As shown, a driving oil inlet 11 is provided at the bottom of the spindle base 1, and the driving oil inlet 11 is connected to a driving oil delivery channel 21 axially arranged on the hydrostatic sleeve 2, and both ends of the driving oil delivery channel 21 are respectively connected to the circumferential outer sides of both ends of the rotating shaft core 3. Oil can be supplied between the rotating shaft core 3 and the hydrostatic sleeve 2 through the driving oil inlet 11 and the driving oil delivery channel 21, which can effectively reduce friction and increase service life.

[0035] The principle of this embodiment is that the workpiece 5 is arranged in the rubber chuck 421 through the clamping channel 423, and the hydrostatic sleeve 2, the rotating shaft core 3 and the hydraulic chuck mechanism 4 are supplied with oil through the chuck clamping and rotating oil supply mechanism 6, wherein the clamping oil supply channel 63 in the rotating shaft core 3 is supplied with oil, and the second radial hydrostatic bearing 432 and the cylinder piston shaft core 41 can be supplied with oil through the clamping oil supply channel 63, and oil is supplied to the clamping oil chamber 65 and the first radial hydrostatic bearing 431 through the clamping liquid outlet channel 64 in the cylinder piston shaft core 41 respectively, and the hydraulic oil in the clamping oil chamber 65 can push the annular push part 411 to move to the left side, and the annular push part 411 can enable the rubber chuck 421 to clamp the workpiece through the first conical surface 413 and the conical surface 422, and one end of the ring pull tube 8 is clamped with the rubber chuck 421 The annular push portion 411 is connected to the left side, and as the annular push portion 411 moves to the left side, it can drive the other end of the collar pull tube 8 to move, and the other end of the collar pull tube 8 is clamped adjacent to another rubber chuck 421, so that the two rubber chucks 421 are both set to clamp the workpiece 5; by releasing the rotating oil inlet mechanism 7, oil can be supplied to the hydrostatic sleeve 2, the rotating shaft core 3 and the hydraulic chuck mechanism 4, and the release hydraulic oil enters through the release oil inlet channel 71, and the release oil can be easily introduced into the release oil delivery channel 73 through the release oil delivery hole 72, and the hydraulic oil in the release oil delivery channel 73 can be used to supply oil to the release oil outlet channel 74, and the annular push portion 411 can be pushed by hydraulic oil through the release oil chamber 75 connected to the release oil outlet channel 74, so as to drive the annular push portion 411 to reset and enable the rubber chuck 421 to release the workpiece 5.

[0036] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0037] Although this article uses more spindle base 1, drive oil inlet 11, hydrostatic sleeve 2, drive oil delivery channel 21, rotating shaft core 3, shaft core annular connecting part 31, pulley body 32, chuck push ring 33, second conical surface 34, hydraulic chuck mechanism 4, cylinder piston shaft core 41, annular push part 411, chuck action part 412, first conical surface 413, chuck assembly 42, rubber chuck 421, conical surface 422, clamping channel 423, radial hydrostatic bearing 43, the first The first radial static pressure bearing 431, the second radial static pressure bearing 432, the workpiece 5, the chuck clamping rotating oil feeding mechanism 6, the clamping oil feeding channel 61, the clamping oil delivery hole 62, the clamping oil delivery channel 63, the clamping oil outlet channel 64, the clamping oil chamber 65, the chuck releasing rotating oil feeding mechanism 7, the releasing oil feeding channel 71, the releasing oil delivery hole 72, the releasing oil delivery channel 73, the releasing oil outlet channel 74, the releasing oil chamber 75, the collar pulling tube 8 and other terms are used, but the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A central drive spindle piston clearance elimination structure, comprising a spindle base (1), a hydrostatic sleeve (2) fixedly provided on the inner side of the spindle base (1), a rotating shaft core (3) rotatably provided on the inner side of the hydrostatic sleeve (2), a hydraulic chuck mechanism (4) provided on the inner side of the rotating shaft core (3), characterized in that: The hydraulic chuck mechanism (4) comprises an oil cylinder piston shaft core (41) and a chuck assembly (42) for clamping a workpiece (5); a radial static pressure bearing (43) is provided on the circumferential outer side of the oil cylinder piston shaft core (41); a chuck clamping rotating oil supply mechanism (6) which can drive the chuck assembly (42) to clamp the workpiece (5) and can be connected to the radial static pressure bearing (43) and a chuck releasing rotating oil supply mechanism (7) which can drive the chuck assembly (42) to release the workpiece (5) are provided between the spindle base (1), the static pressure sleeve (2), the rotating shaft core (3) and the oil cylinder piston shaft core (41).

2. A middle drive spindle piston clearance elimination structure according to claim 1, characterized in that: The rotating shaft core (3) and the oil cylinder piston shaft core (41) are both cylindrical, one end of the rotating shaft core (3) has a shaft core annular connecting portion (31) extending to the outside of the end surface of one end of the static pressure sleeve (2), and the shaft core annular connecting portion (31) is fixedly connected to a pulley body (32) sleeved on the circumferential outside of one end of the oil cylinder piston shaft core (41), an annular pushing portion (411) is provided on the circumferential outside of the middle part of the oil cylinder piston shaft core (41), one end of the oil cylinder piston shaft core (41) extends to the circumferential inside of one end of the rotating shaft core (3) having the shaft core annular connecting portion (31), and the oil cylinder piston shaft core (41) is penetrated on the circumferential inside of the pulley body (32).

3. A middle drive spindle piston clearance elimination structure according to claim 2, characterized in that: The number of the radial static pressure bearings (43) is two and they are respectively a first radial static pressure bearing (431) and a second radial static pressure bearing (432) located on both sides of the annular pushing portion (411); the first radial static pressure bearing (431) is arranged between the circumferential inner side of the pulley body (32) and the circumferential outer side of one end of the cylinder piston shaft core (41); the second radial static pressure bearing (432) is arranged between the circumferential outer side of the other end of the cylinder piston shaft core (41) and the circumferential inner side of one end of the rotating shaft core (3) having the shaft core annular connecting portion (31).

4. A middle drive spindle piston clearance elimination structure according to claim 2 or 3, characterized in that: The chuck assembly (42) comprises two symmetrically arranged rubber chucks (421), each of the rubber chucks (421) is in the shape of a conical cylinder, and one end corresponding to the two rubber chucks (421) is respectively clamped with the sleeve pull tube (8) to realize the linkage of the two rubber chucks (421), the outer side of the rubber chuck (421) is respectively provided with a conical surface (422) and the inner side is respectively provided with a clamping channel (423) for clamping the workpiece (5), and the outer conical surfaces of the two rubber chucks (421) are symmetrically arranged and are respectively arranged to be inclined upward toward the two ends of the spindle base (1).

5. The intermediate drive spindle piston clearance elimination structure according to claim 4, characterized in that: The inner side of the middle part of the oil cylinder piston shaft core (41) has a chuck action part (412) corresponding to the inner and outer sides of the annular push part (411) and sleeved on the outer side of one of the rubber chucks (421), and the chuck action part (412) has a first conical surface (413) in contact with the outer conical surface of the rubber chuck (421), and the inner side of the chuck push ring (33) has a second conical surface (34) in contact with the outer conical surface of the rubber chuck (421) on the circumferential inner side of one end of the rotating shaft core (3) away from the shaft core annular connecting part (31).

6. The intermediate drive spindle piston clearance elimination structure according to claim 3, characterized in that: The chuck clamping and rotating oil supply mechanism (6) comprises a clamping oil supply channel (61) arranged at the bottom of the main shaft base (1); the clamping oil supply channel (61) is connected to a clamping oil supply channel (63) located in the rotating shaft core (3) through a plurality of clamping oil supply holes (62) radially penetrating the hydrostatic sleeve (2); the clamping oil supply channel (63) is connected to the second radial hydrostatic bearing (432) and / or the clamping oil outlet channel (64) located in the cylinder piston shaft core (41); and the clamping oil outlet channel (64) is respectively connected to the first radial hydrostatic bearing (431) and the clamping oil chamber (65) located between the annular push portion (411) and the second radial hydrostatic bearing (432).

7. A middle drive spindle piston clearance elimination structure according to claim 6, characterized in that: The clamping oil delivery holes (62) are evenly distributed in the circumferential direction, the clamping oil delivery channel (63) is axially extended along the rotating shaft core (3), one end of the clamping oil delivery channel (63) is connected to the second radial static pressure bearing (432), and the middle part of the clamping oil delivery channel (63) is connected to the clamping oil outlet channel (64), and the clamping oil outlet channel (64) is axially extended along the oil cylinder piston shaft core (41), and one end of the clamping oil outlet channel (64) is respectively connected to the first radial static pressure bearing (431) and the clamping oil chamber (65).

8. The intermediate drive spindle piston clearance elimination structure according to claim 3, characterized in that: The chuck release rotation oil supply mechanism (7) comprises a release oil supply channel (71) arranged at the bottom of the main shaft base (1); the release oil supply channel (71) is connected to a release oil supply channel (73) located in the rotating shaft core (3) through a plurality of release oil supply holes (72) radially penetrating the hydrostatic sleeve (2); the release oil supply channel (73) is connected to a release oil outlet channel (74) located in the oil cylinder piston shaft core (41); and the release oil outlet channel (74) is connected to a release oil chamber (75) located between the annular push portion (411) and the first radial hydrostatic bearing (431).

9. The intermediate drive spindle piston clearance elimination structure according to claim 8, characterized in that: The release oil delivery holes (72) are evenly distributed in the circumferential direction, the release oil delivery channel (73) is axially extended along the rotating shaft core (3), and the middle part of the release oil delivery channel (73) is connected to the release oil outlet channel (74), and the release oil outlet channel (74) is axially extended along the oil cylinder piston shaft core (41), and one end of the release oil outlet channel (74) is bent and connected to the release oil chamber (75).

10. The intermediate drive spindle piston clearance elimination structure according to claim 3, characterized in that: A driving oil inlet (11) is provided at the bottom of the spindle base (1), and the driving oil inlet (11) is connected to a driving oil delivery channel (21) axially arranged on the static pressure sleeve (2), and the two ends of the driving oil delivery channel (21) are respectively connected to the circumferential outer sides of the two ends of the rotating shaft core (3).

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