Rotary spindle workpiece anti-deflection easy-to-adjust clamping device with optimized stability

Abstract

A rotation main shaft workpiece anti-deflection easy-to-adjust clamping device with optimized stability is characterized in that a rolling bearing (319) is sleeved on the front section of the outer wall of a shell (314), a synchronous pulley (311) is sleeved outside the rolling bearing (319), a driving plate (308) is pressed at the front ends of the rolling bearing (319) and the synchronous pulley (311), the front end of the shell (314) is connected with a clamp body (304), and a spring clamping jaw (303) is lined on the inner wall of an axial middle hole of the shell (314) and the inner wall of an axial middle hole of the clamp body (304). The front end faces of the clamp body (304) and the spring clamping jaw (303) are connected with the end cover (302) in a pressing mode. And the adjusting nut (305) is coaxially embedded in the inner wall of the rear section of the middle hole of the clamp body (304) in a diameter-expanding manner. The multi-stage composite clamping adjusting mechanism which is coordinated and matched with one another is combined, the shell, the spring clamping jaw and the clamp body are installed on the machine tool spindle, clamping is stable, and the continuity and stability of the initial clamping force of the clamping device in the machining process are guaranteed. And disassembly, assembly and maintenance are convenient. Adjusting and loosening are accurate and convenient, sliding is smooth and safe, driving is convenient, the machining effect and machining quality are guaranteed, and the application range is wide.

Description

TECHNICAL FIELD

[0001] The utility model relates to an improved technology of workpiece clamping device for rotary main shaft with optimized stability. BACKGROUND

[0002] The workpiece clamping device for rotary main shaft is an important component of machine tool, which is mainly used for fixing workpieces to ensure that the workpieces can be processed stably and accurately under the driving of the rotary main shaft.

[0003] The workpiece clamping device is usually composed of a chuck, a driving device, a positioning device, and a gasket. The chuck is the part that clamps the workpiece and is composed of a fixed jaw and a movable jaw. The movement of the jaw and the clamping force are controlled by a screw rod adjuster. The driving device provides power to enable the chuck to clamp or release the workpiece. Common power sources include hydraulic, pneumatic, and electromagnetic power sources. The positioning device ensures that the chuck can accurately position the workpiece to ensure processing accuracy. The gasket is used to cooperate with the chuck and the surface of the workpiece to distribute pressure and prevent damage to the surface of the workpiece.

[0004] When the driving device receives a signal, the workpiece clamping device for rotary main shaft starts to work, and the jaw of the chuck clamps the workpiece. For hydraulic and pneumatic clamping devices, the power source transmits pressure to the chuck through a pipeline, causing the movable part of the jaw to move and clamp the workpiece. For electromagnetic clamping devices, the workpiece is attracted by electromagnetic force. The positioning of the chuck is ensured by initial positioning, clamping force, and hydraulic or pneumatic stability control.

[0005] The rotary clamp is a mechanical device used to clamp workpieces on machine tools. It uses the radial movement of movable jaws evenly distributed on the chuck body to clamp and position workpieces. It is a precision clamp.

[0006] The existing rotary clamp for rotary main shaft, especially for workpieces with high precision requirements, especially for workpieces with long axial dimensions, may have the problem of deflection due to insufficient stability under high-speed operation, which affects the processing quality and efficiency. INVENTION CONTENTS

[0007] The utility model provides a workpiece anti-deflection easy-to-adjust clamping device for rotary main shaft with optimized stability, aiming to improve the problem of deflection due to insufficient stability under high-speed operation of the existing rotary clamp for rotary main shaft.

[0008] For this purpose, the utility model discloses, including: end cover, spring clamp jaw, clamping concrete, adjusting nut, dial, synchronous pulley, shell and rolling bearing. Shell outer wall front section sleeve joint rolling bearing, rolling bearing outer sleeve synchronous pulley, rolling bearing and synchronous pulley front end pressure dial, shell front end connection clamping concrete, in the axial hole wall of shell and clamping concrete lining spring clamp jaw, clamping concrete and spring clamp jaw front end surface pressure end cover, in the hole rear section wall of clamping concrete expands coaxially and installs adjusting nut.

[0009] Wherein, the shell inner wall groove pours 1.5mm thickness's tin bronze layer, and evenly distributes several axial oil groove. Clamping concrete is installed to the upper surface of main shaft front end, and the inner taper surface of clamping concrete and main shaft rotation axis tend to be coaxial. The left end surface of dial, the outer ring of rolling bearing is pressed, and after the inner ring of rolling bearing is pressed by gland, is connected on the outer edge of shell rear end through screw thread.

[0010] Further, in order to achieve the above object, the utility model is provided as follows:

[0011] In the hole rear section wall of clamping concrete, the supporting ring is installed by pressure joint in the coaxial embedding of adjusting nut rear side.

[0012] The ring groove is arranged around the shaft hole of the rear side end surface of dial, wherein the annular gland is embedded and installed, and the rolling bearing is pressed by the gland.

[0013] The rolling bearing is lined with adjusting gasket.

[0014] The bushing is installed on the inner wall of the rear end of the hole of the spring clamp jaw.

[0015] The annular lining plate is installed coaxially on the rear side of the spring clamp jaw.

[0016] The inclined slot is radially arranged on the outer wall of the clamping concrete.

[0017] The ring groove is arranged on the outer edge of the shell front section, the rolling bearing is sleeved by the sleeve lining, and the synchronous pulley is sleeved by the sleeve lining, and moreover, the fourth screw is installed on the ring platform edge of the rear end of the ring groove.

[0018] The annular first skeleton rotary sealing ring is lined in the hole inner wall of the dial, and the second skeleton rotary sealing ring is embedded in the ring platform arranged around the hole of the rear side end surface of the synchronous pulley.

[0019] Compared with the prior art, the utility model discloses the beneficial effect is: combination setting mutual coordination and cooperation's multistage compound clamping adjusting mechanism, the shell, spring jaw and the clamping concrete installation on the machine tool main shaft, and clamping is stable, guarantees the initial clamping force of clamping device in the continuity and stability in the processing. BRIEF DESCRIPTION OF DRAWINGS

[0020] The following drawings are illustrative and should not be construed as limiting the present utility model. By referring to the following drawings, the reader can better understand the embodiments of the present utility model and further understand the advantages and technical features of the present utility model.

[0021] Figure 1 It is structure schematic drawing of the utility model embodiment 1.

[0022] Reference signs include:

[0023] 300-workpiece, 301-main shaft, 302-end cover, 303-spring jaw, 304-clamping concrete, 305-adjusting nut, 306-wrench, 307-supporting ring, 308-dial, 309-pressing cover, 310-adjusting gasket, 311-synchronous pulley, 312-bushing, 313-lining plate, 314-housing, 315-groove, 316-sealing gasket, 317-first skeleton rotary sealing ring, 318-second skeleton rotary sealing ring, 319-rolling bearing, 320-first screw, 321-second screw, 322-third screw, 323-fourth screw, 324-fifth screw. DETAILED DESCRIPTION

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present utility model belongs. When there is a conflict, the definition in the present specification shall prevail.

[0025] The utility model discloses a main shaft 301, end cover 302, spring jaw 303, clamping concrete 304, adjusting nut 305, dial 308, synchronous pulley 311, housing 314 and rolling bearing 319.

[0026] The preferred embodiments of the present utility model and the included embodiments can be more easily understood by referring to the following.

[0027] Embodiment 1: as attached Figure 1As shown, a spanner 306 is inserted into a radial hole on the outer wall of the adjusting nut 305. The workpiece 300 is inserted into the hole of the end cover 302 and clamped between a set of annularly distributed spring clamping jaws 303.

[0028] In the embodiment of the utility model, the clamping body 304 is fixed with the main shaft 301 through the third screw 322 distributed in the circumference, the annular end cover 302 is fixed on the front side end face of the clamping body 304 through a set of second screws 321, the clamping body 304 is internally provided with the spring clamping jaw 303 for clamping the workpiece 300, and the rear part of the spring clamping jaw 303 extends into the inner hole of the main shaft 300 and is positioned, so that the coaxiality of the center of the workpiece 300 and the center of the main shaft 301 is ensured. It should be noted that the clamping body 304 is installed on the front end of the main shaft 301, and the inner tapered surface of the clamping body 304 should be coaxial with the rotary axis of the main shaft 301, and the coaxiality error between the outer tapered surface of the clamping jaw 303 and the inner hole should be not greater than 0.002mm.

[0029] In the embodiment of the utility model, further, the lining plate 313 internally provided in the inner hole of the main shaft 301 is used to support the distal end of the workpiece 300 extending into the main shaft 301.

[0030] In the embodiment of the utility model, further, the ring groove is arranged on the outer edge of the front section of the shell 314, the outer sleeve of the rolling bearing 319 is connected and mounted through the sleeve lining, and the fourth screw 323 is installed on the edge of the ring table at the rear end of the ring groove, and the axial mounting position of the synchronous pulley 311 is accurately adjusted by screwing the fourth screw 323. The lining 312 is arranged on the inner wall of the rear section of the spring clamping jaw 303, and the annular lining plate 313 is pressed and connected on the ring table on the inner wall of the deep inner hole of the main shaft 301 through the fifth screw 324. The rear end of the workpiece 300 is arranged in the middle hole of the lining plate 313, the outer wall of the rear end of the workpiece 300 is clamped into the inner wall of the lining 312, and the rear end of the workpiece 300 is stably and centrally limited.

[0031] In the embodiment of the utility model, the adjusting nut 305 is pressed and connected on the front end face of the main shaft 301 through the supporting ring 307. Further, the sealing gasket 316 is arranged on the pressing interface between the main shaft 301 and the clamping body 304.

[0032] In the embodiment of the utility model, as the precise bearing assembly, the inside lining of the rolling bearing 319 is equipped with the adjusting gasket 310. The specific assembly method comprises: horizontally stacking two rolling bearing monomers, and lifting the outer ring of the lower one of the rolling bearing monomers; separating the inner rings of the two rolling bearing monomers by a spacer; applying a preset force on the outer ring of the upper one of the rolling bearing monomers, which is the pre-tightening force after installation; then, measuring the height value between the outer rings of the two rolling bearing monomers, and the height difference between the spacer separating the two rolling bearing monomers is the thickness difference of the two gaskets of the inner and outer rings of the rolling bearing monomers. The left end face of the trimming dial 308 is pressed against the outer ring of the rolling bearing 319, and the gland 309 is tightened to press the inner ring of the rolling bearing 319, and then the rolling bearing 319 is connected to the outer edge of the rear end of the shell 314 through the screw thread.

[0033] In the embodiment of the utility model, further, the adjusting nut 305 threaded with the outer circle of the spring clamp jaw 303 is also installed in the clamp body 304, the circumferential surface of the clamp body 304 is provided with the slot 315 with a certain angle at the position corresponding to the axial position of the adjusting nut 305, the outer circumference of the adjusting nut 305 is provided with a plurality of radial holes, the radial holes are aligned with the slot 315 provided on the outer wall of the clamp body 304, the wrench 306 is inserted into the radial hole of the circumferential surface of the adjusting nut 305 through the slot 315, and the wrench 306 can be twisted around the axial line of the clamp body 304 to adjust the adjusting nut 305, so as to further adjust the coaxial mounting support ring 307 at the rear side of the adjusting nut 305. The size of the support ring 307 is adjusted and trimmed, and the axial gap of the adjusting nut 305 in the clamp body 304 can be just eliminated, but the adjusting nut 305 can rotate in the clamp body 304.

[0034] In the embodiment of the utility model, further, the wrench 306 drives the adjusting nut 305 to rotate, and because the adjusting nut 305 is limited in the space of axial movement, only the elastic clamp jaw 303 can move axially; the conical inner wall at the front end of the spring clamp jaw 303 also shrinks in radial size in proportion while moving axially, so as to achieve the purpose of clamping the workpiece 300. The front end cover 302 can provide an axial positioning reference surface when the workpiece 300 is installed.

[0035] Further, the main shaft 301 is connected with the dial plate 308 through the third screw 322, the dial plate 308 is connected with the synchronous pulley 311 through the first screw 320, the synchronous pulley 311 is supported on the outer edge of the front end of the shell 314 through the rolling bearing 319, and the rolling bearing 319 is fixed on the shell 314 through the gland 309; meanwhile, the dial plate 308 and the gland 309 have a gap and can relatively rotate; the gap of the rolling bearing 319 can be eliminated by adjusting the thickness of the gasket 310, so that the synchronous pulley 311 can stably rotate without deflection; the first skeleton rotary sealing ring 317 is embedded and installed in the inner edge of the dial plate 308, and the second skeleton rotary sealing ring 318 is embedded and installed in the inner edge of the rear end of the synchronous pulley 311, so as to protect the rolling bearing 319; the skeleton rotary sealing ring 317 prevents the oil pool of the main shaft 301 from leaking, and also prevents the cooling liquid used for machining outside from flowing into the oil pool of the main shaft 301 and the rolling bearing 319; and the skeleton rotary sealing ring 318 mainly prevents the cooling liquid used for machining outside from flowing into the rolling bearing 319.

[0036] Further, the synchronous pulley 311 is driven to rotate by the motor through the synchronous belt, and then the main shaft 301 and the workpiece 300 are driven to rotate.

[0037] In the embodiment of the utility model, first, manual operation is carried out, the handle 306 is inserted and moved to drive the adjusting nut 305 to rotate and then drive the clamping jaw 303 to move left to realize radial contraction and clamp the workpiece 300, after the workpiece 300 is clamped, the wrench 306 needs to be removed, and then the main shaft 301 is rotated to carry out machining work.

[0038] Preferably, the inner wall of the shell 314 is cast with a 1.5mm-thick tin bronze layer, the tin bronze layer is in the gap between the shell 314 and the main shaft 301, the tin bronze layer surrounds the quenched outer wall of the main shaft 301 inward to improve the friction performance between the inner wall of the shell 314 and the outer wall of the main shaft 301, and the inner wall of the shell 314 is precisely scraped to ensure the uniformity of the contact between the inner wall of the shell 314 and the outer wall of the main shaft 301; further, a plurality of axial oil grooves are uniformly distributed on the surface circumference of the tin bronze layer of the inner wall of the shell 314 to improve the lubricating performance between the inner wall of the shell 314 and the outer wall of the main shaft 301; and the main shaft 301 is immersed in the oil pool. Through these measures, the precision and accuracy of the rotation of the main shaft 301 are ensured, and the radial runout of the end of the main shaft 301 is controlled to be 0.003mm.

[0039] Based on the above embodiments of the utility model, all other embodiments obtained by the person skilled in the art without creative labor shall belong to the protection scope of the utility model.

Claims

1. A swing spindle workpiece anti-sway easy-adjustment clamping device with optimized stability, comprising an end cover (302), a spring clamping jaw (303), a clamping body (304), an adjusting nut (305), a dial plate (308), a synchronous pulley (311), a housing (314) and a rolling bearing (319); characterized in that, The outer wall of the shell (314) is sleeved with a rolling bearing (319) in the front section, the rolling bearing (319) is sleeved with a synchronous belt wheel (311), the front end of the rolling bearing (319) and the synchronous belt wheel (311) is press-fitted with a dial plate (308), the front end of the shell (314) is connected with a clamp body (304), the inner wall of the axial hole of the shell (314) and the clamp body (304) is lined with a spring clamp jaw (303), the front end face of the clamp body (304) and the spring clamp jaw (303) is press-fitted with an end cover (302), and the rear section of the hole of the clamp body (304) is coaxially embedded with an adjusting nut (305) with an enlarged diameter.

2. The stability optimized, workpiece anti- chatter, easy adjustable, chucking device for a rotary spindle as claimed in claim 1, wherein, The rear end of the hole of the spring clamp jaw (303) is provided with a bushing (312).

3. The stability optimized, runout workpiece anti- yaw easy adjustment chucking device of claim 1, wherein, The rear side of the spring clamp jaw (303) is coaxially provided with a ring-shaped lining plate (313).

4. The stability optimized, runout workpiece anti- dwell chucking device of claim 1, wherein, The rear side of the adjusting nut (305) is coaxially press-fitted with a supporting ring (307) in the hole of the clamp body (304) with an enlarged diameter.

5. The stability optimized, runout workpiece anti- dwell chucking device of claim 1, wherein, The clamp body (304) is installed on the front end of the main shaft (301), and the inner taper surface of the clamp body (304) is coaxial with the rotation axis of the main shaft (301).

6. The stability optimized, runout workpiece anti- dwell chucking device of claim 1, wherein, The rear end face of the dial plate (308) is provided with a ring groove around the hole, a ring-shaped gland (309) is embedded in the ring groove, and the rolling bearing (319) is press-fitted by the gland (309).

7. The stability optimized, runout workpiece anti- dwell chucking device of claim 1, wherein, The inner wall of the hole of the dial plate (308) is lined with a ring-shaped first skeleton rotary seal ring (317), and the rear end face of the synchronous belt wheel (311) is provided with a ring-shaped hole, in which a second skeleton rotary seal ring (318) is embedded.

8. The stability optimized, runout workpiece anti- dwell chucking device of claim 1, wherein, The inner wall of the shell (314) is cast with a 1.5mm-thick tin bronze layer, and a plurality of axial oil grooves are uniformly formed.

9. The stability optimized, run out workpiece anti- dwell chucking device of claim 1, wherein, The rolling bearing (319) is lined with an adjusting gasket (310).

10. The stability-optimized, workpiece anti-dancing, easy-adjustment chucking device for a rotary spindle according to claim 6, characterized in that The left end face of the dial plate (308) is pressed against the outer ring of the rolling bearing (319), and the inner ring of the rolling bearing (319) is pressed against the gland (309), which is connected to the rear end of the shell (314) by a thread connection.

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