Grinding head device of double-face machining grinding machine

Abstract

The invention discloses a grinding head device of a double-face machining grinding machine. Comprising a box body part, an upper grinding head assembly, a lower grinding head assembly, an upper main shaft driving device and a lower main shaft driving device, wherein the upper grinding head assembly and the lower grinding head assembly are symmetrically arranged up and down and are supported and mounted in the box body part by adopting a hard rail sliding rail pair; the upper main shaft driving device and the lower main shaft driving device are symmetrically arranged behind the box body part and respectively provide grinding power for the upper grinding head assembly and the lower grinding head assembly; the two groups of Z-axis feeding parts are fixed in the box body part and are used for respectively providing Z-axis feeding force for the upper grinding head assembly and the lower grinding head assembly; the upper grinding head assembly comprises a main shaft box, an upper main shaft limited in the main shaft box through a lower end cylindrical roller bearing, a bidirectional thrust angular contact ball bearing and a cylindrical roller bearing, a rotary joint connected with the upper end of the upper main shaft through a joint seat, and a driven belt wheel connected with the upper main shaft through a spline structure and an unloading device arranged on the main shaft box; the upper spindle flange is arranged at the lower end of the upper spindle. The invention has the advantages of good main shaft rigidity and capability of improving the dynamic rigidity of the whole machine.

Description

Technical Field

[0001] The invention belongs to a grinding machine, and in particular relates to a grinding head device of a double-sided processing grinding machine. Background Art

[0002] During the grinding process of parts, the existing double-sided grinders have defects such as unstable dynamic performance of the whole machine, poor stability of the C-type grinding angle, poor rigidity of the grinding head spindle, end face runout that does not meet the requirements of the same industry, and poor dynamic rigidity of the whole machine. Summary of the invention

[0003] The purpose of the present invention is to provide a grinding head device for a double-sided grinding machine with good spindle rigidity in view of the problems existing in the prior art.

[0004] The technical solution of the present invention is achieved in this way: The grinding head device of the double-sided processing grinder provided by the present invention comprises a box body part, an upper grinding head assembly and a lower grinding head assembly which are symmetrically arranged up and down and supported and installed in the box body part by a hard rail slide rail pair, an upper spindle driving device and a lower spindle driving device which are symmetrically arranged at the rear of the box body part and respectively provide grinding power for the upper grinding head assembly and the lower grinding head assembly, and two groups of Z-axis feeding parts which are fixed in the box body part and respectively provide Z-axis feeding force for the upper grinding head assembly and the lower grinding head assembly; the upper grinding head assembly comprises a spindle box, an upper spindle which is limited by a lower end cylindrical roller bearing, a bidirectional thrust angular contact ball bearing, and a cylindrical roller bearing in the spindle box, a rotary joint connected to the upper end of the upper spindle through a joint seat, a driven pulley connected to the upper spindle through a spline structure and a unloading device arranged on the spindle box, and an upper spindle flange arranged at the lower end of the upper spindle.

[0005] The spline structure includes a spline sleeve connected to the driven pulley and a spline arranged on the upper main shaft. The unloading device includes a pulley fixing seat fixed to the upper end of the main shaft box, an angular contact ball bearing, an outer spacer sleeve, and an inner spacer sleeve arranged between the pulley fixing seat and the spline sleeve. The angular contact ball bearing is fastened with a first spacer sleeve and a precision locking nut at the bottom, and the angular contact bearing is pre-tightened at the top through a grinding end cover, and a first lip sealing ring is provided.

[0006] The lower end cylindrical roller bearing is pre-tightened and fixed in position by grinding the first inner sleeve, labyrinth cover, second inner sleeve, and outer sleeve; the bidirectional thrust angular contact ball bearing is fastened by the sleeve and the first precision locking round nut; the cylindrical roller bearing is pre-tightened and fixed in position by grinding the first inner labyrinth ring, the first outer labyrinth ring, and the second outer labyrinth ring, and the second inner labyrinth ring is used in combination with the second precision locking round nut to fasten the cylindrical roller bearing.

[0007] The upper spindle driving device includes a driving pulley connected to the driven pulley through a spindle synchronous belt and driven by a variable frequency motor, and a motor base for fixing the variable frequency motor; the motor base is hinged to the box body through a hinge mechanism; the hinge mechanism includes a first motor hinge seat and a second motor hinge seat fixed to the box body, and a motor hinge shaft arranged on the first motor hinge seat and the second motor hinge seat and fixed to the motor base.

[0008] A synchronous belt tensioning and adjusting mechanism is provided between the motor base and the box body part 1, and the synchronous belt tensioning and adjusting mechanism includes a support plate fixed on the box body part, a hinge rod hinged on the support plate through a pull rod seat and passing through the motor base through a nut to tighten the motor base toward the box body part, and two tightening screws fixed between the motor base and the support plate for limiting the motor base.

[0009] The Z-axis feeding part includes: a Z-axis screw assembly consisting of a screw fixed on the box body and a screw nut fixed to the upper grinding head assembly, a worm wheel fixed on the screw, a worm matched with the worm wheel, and a servo motor connected to the worm through a gear mechanism; the screw nut is fixed to the upper grinding head assembly through a screw nut seat, and the upper and lower ends of the screw are fixed to the box body by upper and lower bearing structures respectively.

[0010] The upper bearing structure includes a thrust ball bearing seat for positioning the upper end of the screw rod, a first one-way thrust ball bearing and a second one-way thrust ball bearing, and a first deep groove ball bearing and a second deep groove ball bearing, an upper fixed seat and a lower fixed seat for positioning and fixing the first one-way thrust ball bearing and the second one-way thrust ball bearing with the first deep groove ball bearing and the second deep groove ball bearing, a first pressure cover and a second pressure cover for grinding and pressing the first deep groove ball bearing and the second deep groove ball bearing respectively, a fixing sleeve for positioning and tightening the upper fixed seat and the lower fixed seat, a grinding gasket provided between the fixing sleeve and the upper fixed seat, and a waterproof cover for covering the upper bearing structure; the thrust ball bearing seat is fastened to the screw rod by a third precision locking round nut, the worm gear is fixed in the middle of the thrust ball bearing seat, and the thrust ball bearing seat is connected to the screw rod and the worm gear by a first flat key and a second flat key respectively.

[0011] The lower bearing structure includes a lower bearing seat and a screw bearing for positioning the lower end of the screw, a second spacer sleeve and a fourth precision locking round nut for fastening one end of the screw bearing, a third spacer sleeve and a grinding end cover for fastening the other end of the screw bearing, and a second lip sealing ring and a third lip sealing ring for sealing both ends of the screw bearing.

[0012] The gear mechanism includes a driving gear driven by a servo motor and a driven gear meshing with the driving gear and fixed on the worm. The servo motor is fixed on the worm seat through a motor mounting plate. The worm and the driven gear are fixed in place by expansion sleeves. One end and the other end of the worm close to the driven gear are respectively rotatably positioned in the worm seat by a third deep groove ball bearing, a first single-row tapered roller bearing and a second single-row tapered roller bearing. The third deep groove ball bearing is locked by a bearing gland and a retaining spring. A worm adjustment pad and an adjustment seat are provided at the other end of the worm to adjust the worm. The first single-row tapered roller bearing and the third single-row tapered roller bearing are locked by a locking round nut. A rear gland covering the other end of the worm and an observation window covering the mounting opening are provided on the worm seat. Beneficial Effects

[0013] The main shaft of the grinding head device in the present invention is limited in the main shaft by the lower cylindrical roller bearing, the bidirectional thrust angular contact ball bearing and the cylindrical roller bearing. The hard rail support can be added to ensure the high rigidity of the mechanical main shaft and improve the dynamic rigidity of the whole machine. The main shaft drive structure adopts synchronous drive to meet the requirements of the up and down movement of the main shaft box. The Z-axis feeding device feeds the main shaft through the worm gear transmission + helical gear transmission + servo motor direct drive, which can improve the accuracy.

[0014] The technical solution of the present invention is further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the present invention.

[0016] Figure 2 It is a schematic diagram of different directions of the present invention.

[0017] Figure 3 It is a cross-sectional view of the upper grinding head assembly of the present invention.

[0018] Figure 4 It is a schematic diagram of the upper spindle driving device in the present invention.

[0019] Figure 5 It is a schematic diagram of different directions of the upper spindle driving device in the present invention.

[0020] Figure 6 It is a schematic diagram of the arrangement of the upper grinding head assembly and the lower grinding head assembly on the box body in the present invention.

[0021] Figure 7 yes Figure 6 Enlarged view of point I in the middle.

[0022] Figure 8 yes Figure 6 Enlarged view of point II in the middle.

[0023] Fig. 9It is a schematic diagram of the adjusting screw structure in the box part.

[0024] Fig.10 It is a schematic diagram of the sealing and waterproof structure of the upper and lower boxes in the box part.

[0025] Fig.11 It is a schematic diagram of the upper grinding head assembly and the spindle box.

[0026] Fig.12 yes Fig.11 AA section view.

[0027] Fig.13 It is a schematic diagram of the Z-axis feeding part of the present invention.

[0028] Fig.14 yes Fig.13 BB section view.

[0029] Fig.15 It is a cross-sectional view of the Z-axis feed portion.

[0030] Fig.16 It is a cross-sectional view of the trimming mechanism in the present invention.

[0031] Fig.17 yes Fig.16 Schematic diagram of the trimming mechanism shown.

[0032] Fig.18 It is a cross-sectional view of another trimming mechanism in the present invention.

[0033] Fig.19 yes Fig.18 Schematic diagram of the trimming mechanism shown. DETAILED DESCRIPTION

[0034] See Figure 1 , Figure 2The double-sided grinding machine of the present invention comprises a box body 1, a lower grinding head assembly 2, a feeding part 3, an upper grinding head assembly 4, an upper spindle driving device 5, a Z-axis feeding part 6, a dressing mechanism 7, and a lower spindle driving device 8; the upper grinding head assembly 4 and the lower grinding head assembly 2 are arranged symmetrically up and down and are installed in the box body 1 with a hard rail slide rail auxiliary support; the axes of the upper grinding head assembly 4 and the lower grinding head assembly 2 are coaxial, and their grinding wheel end faces are parallel; the feeding part 3 is installed in front of the box body 1, and the workpiece processing surface is parallel to the grinding wheel surface of the upper grinding head assembly 4 and the lower grinding head assembly 2 The upper spindle drive device 5 and the lower spindle drive device 8 are symmetrically arranged at the back of the box part 1 to provide grinding power for the upper grinding head assembly 4 and the lower grinding head assembly 2 respectively; two sets of Z-axis feeding parts 6 are respectively arranged at the back of the upper grinding head assembly 4 and the lower grinding head assembly 2 and fixed in the box part 1 to provide Z-axis feeding force for the upper grinding head assembly 4 and the lower grinding head assembly 2; the dressing mechanism 7 is installed at the back of the box part 1 and is located between the upper grinding head assembly 4 and the lower grinding head assembly 2; the box part 1 includes an upper box 109, a lower box 102 and a base 101.

[0035] The structures of the lower grinding head assembly 2 and the lower spindle drive device 8 in the double-sided grinding machine are respectively the same as those of the upper grinding head assembly 4 and the upper spindle drive device 5, but the installation directions are opposite. Therefore, the present invention only describes the upper grinding head assembly 4 and the upper spindle drive device 5.

[0036] See Figure 3 The upper grinding head assembly 4 includes a spindle box 406, an upper spindle 401 limited in the spindle box 406 by a lower end cylindrical roller bearing 432, a bidirectional thrust angular contact ball bearing 429, and a cylindrical roller bearing 424, a grating scale 407 arranged at the front end of the spindle box 406, a rotary joint 415 connected to the upper end of the upper spindle 401 through a joint seat 416, a driven pulley 418 connected to the upper spindle 401 through a spline structure and a load-relief device arranged on the spindle box 406, and an upper spindle flange 402 arranged at the lower end of the upper spindle 401; the spline structure includes a driven pulley 418 connected to the driven pulley 418 The connected spline sleeve 414 and the spline arranged on the upper spindle 401, the unloading device includes a pulley fixing seat 410 fixed on the upper end of the spindle box 406, an angular contact ball bearing 412 arranged between the pulley fixing seat 410 and the spline sleeve 414, an outer spacer sleeve 411, and an inner spacer sleeve 420. The angular contact ball bearing 412 is fastened with a spacer sleeve 409 and a precision locking nut 408 at the bottom, and the angular contact bearing 412 is pre-tightened by a grinding end cover 419 at the top, and a lip sealing ring 413 is provided to prevent debris and water vapor from entering the interior of the spindle. The overall dynamic balance of the mechanical spindle must meet the G1 standard requirements.

[0037] The upper spindle 401 is limited in the spindle box 406 by the lower cylindrical roller bearing 432, the bidirectional thrust angular contact ball bearing 429, and the cylindrical roller bearing 424, which can ensure the high rigidity of the mechanical spindle. The lower cylindrical roller bearing 432 is appropriately pre-tightened and fixed by grinding the inner bushing 433, the labyrinth cover 404, the inner bushing 431, and the outer bushing 430. The bidirectional thrust angular contact ball bearing 429 is fastened by the bushing 428 and the precision locking round nut 427. The bushing 428 needs to be hot-mounted on the upper spindle 401 and ensure a certain interference to ensure the pre-tightening effect and stability of the bidirectional thrust angular contact ball bearing 429. The cylindrical roller bearing 424 is appropriately pre-tightened and fixed by grinding the inner labyrinth ring 426, the outer labyrinth ring 425, and the outer labyrinth ring 423. The inner labyrinth ring 422 is used in conjunction with the precision locking round nut 421 to fasten the cylindrical roller bearing. The sub-bearing 424 and the upper spindle flange 402 are positioned concentrically with the upper spindle 401 and limited by the end face. The upper spindle flange 402 needs to be assembled with the upper spindle 401 and then processed to ensure the processing accuracy. The upper spindle flange 402 and the labyrinth cover 404 form a mechanical seal to prevent water from entering. Accordingly, it is also necessary to add O-ring 436, O-ring 435, O-ring 405, V-ring 403 and plug 434 to improve the waterproofness of the spindle and avoid rusting caused by water ingress. The rotary joint 415 is connected to the upper spindle 401 through the joint seat 416 and is sealed with water by the O-ring 417. The driven pulley 418 is connected to the spline of the upper spindle 401 through the spline sleeve 414 to realize the transmission of torque. In order to prevent the driven pulley 418 from affecting the dynamic balance of the spindle when transmitting torque, an unloading device is added to avoid direct vibration force on the upper spindle 401 and only transmit torque.

[0038] See Figure 4 , Figure 5The upper spindle driving device 5 includes a driving pulley 507 connected to the driven pulley 418 through a spindle synchronous belt 508 and driven by a variable frequency motor 505, and a motor base 503 for fixing the variable frequency motor 505; the motor base 503 is hinged to the upper box body 109 of the box body part 1 through a hinge mechanism, and the hinge mechanism includes a motor hinge seat 501 and a motor hinge seat 504 fixed on the upper box body 109, and a motor hinge shaft 502 provided on the motor hinge seat 501 and the motor hinge seat 504 and fixed to the motor base 503; because the synchronous belt 508 needs to be disassembled and tensioned, the motor base 503 needs to be adjusted for opening and closing, and a synchronous belt tensioning device is provided between the motor base 503 and the upper box body 109. The tightening adjustment mechanism comprises a support plate 509 fixed on the upper box body 109, a hinge rod 510 hinged on the support plate 509 through a pull rod seat 511 and passing through the motor base 503, which can tighten the motor base 503 toward the upper box body 109 through a nut, and two tightening screws 506 fixed between the motor base 503 and the support plate 509 for limiting the motor base 503; the axial width of the driving pulley 507 is greater than the axial width of the driven pulley 418, because the upper grinding head assembly 4 needs a stroke to slide on the upper box body 109, and the corresponding synchronous belt 508 is driven by the rotation of the driven pulley 418 to move up and down, and the synchronous belt 508 also rotates and moves up and down on the driving pulley 507.

[0039] See Figure 6 —— Fig. 9 , Fig.11 , Fig.12The box body 1 and the upper grinding head assembly 4 and the lower grinding head assembly 2 are arranged with a hard rail. The base 101 of the box body 1 is connected to the lower box body 102 by bolts. The upper box body 109 and the lower box body 102 are connected by an adjusting screw structure 106 to form a four-corner support box type adjustment structure; the adjusting screw structure 106 includes a support screw 1065 as the main support of the four-corner support box type adjustment, and the upper part of the support screw 1065 is connected by The upper and lower sets of nuts 1061, convex washers 1063 and concave washers 1062 are clamped and fixed on the upper box body 109, and the lower part is fixed to the lower box body 102 by a precision locking round nut 1066. The convex washer 1063 and the concave washer 1062 cooperate to realize spherical adjustment. A washer 1064 is provided between the convex washer 1063 and the upper box body 109, and a washer 1064 is provided between the lower box body 102 and the precision locking round nut 1066. 064′, to avoid damaging the connecting surface, the connection is tightened by adjusting the nut 1061 and the precision locking round nut 1066 to ensure reliability, and the upper and lower box bodies are supported at four corners with an angle adjustment method to control the position accuracy of the upper grinding wheel relative to the lower grinding wheel. The structure is compact and the angle retention is high; the upper grinding head assembly 4 and the lower grinding head assembly 2 are respectively arranged vertically and symmetrically in the rectangular hard rail slide grooves of the upper box body 109 and the lower box body 102 through the rectangular hard rail slide rails on the spindle box 406, and the rectangular hard rail slide rails and the rectangular hard rail slide grooves constitute the hard rail slide rail pair, and the upper box body 109 and the lower box body 102 are respectively fixed with left pressure plates 103 and right pressure plates 107 by screws to form the outer groove of the rectangular hard rail slide groove, and the rectangular hard rail slide rails on the spindle box 406 are pressed by the left pressure plates 103 and the right pressure plates 107 to slide up and down in the rectangular hard rail slide groove, and the corresponding processing requirements are guaranteed during grinding;An elbow bevel strip 108 and an elbow bevel strip 110 for adjusting the gap are arranged between the rectangular hard rail slide and the rectangular hard rail slide groove. The slide rail structure can adjust the gap through the elbow bevel strip 108 and the elbow bevel strip 110 to avoid the reduction of the grinding accuracy of the upper grinding head assembly 4 and the lower grinding head assembly 2 after the rectangular hard rail slide is worn. Accordingly, in order to reduce the friction coefficient of the rectangular hard rail sliding pair and increase the service life, plastic coating treatment should be added to reduce the friction coefficient. The rectangular hard rail slide on the spindle box 406 is a hard quenching surface and does not require plastic coating. The rectangular hard rail slide grooves of the upper box body 109 and the lower box body 102 are plastic coating surfaces. The elbow bevel strip 108, the elbow bevel strip 110 and the rectangular hard rail on the spindle box 406 are plastic coating surfaces. The contact surface of the hard rail slide rail is the plastic surface and the scraping surface to increase the contact stiffness. The elbow oblique insert strip 108 and the elbow oblique insert strip 110 are pulled and pushed by bolts 112 to adjust the gap. The elbow oblique insert strip 108 needs to increase the insert strip side pressure plate 113 to limit the position. The elbow oblique insert strip 108 does not swing left and right during the pulling and pushing process. In order to prevent dust and debris from damaging the sliding surface during the sliding process, the guide scraper plate 111, the guide scraper plate 105, and the scraper transition plate 104 are added to prevent dust and debris from entering. The plastic surface is scraped to ensure the contact accuracy of the fitting surface. Then the lubricating oil groove and oil hole are opened, and the joint surface gap is adjusted by adjusting the screw. The lubricated rectangular hard rail sliding pair can increase the service life. ;

[0040] See Fig.11 , Fig.12 In order to effectively improve the axial rigidity of the spindle feed system, improve the system's XZ surface bending moment resistance, and improve the dynamic performance of the spindle system together with the double rectangular hard rail sliding pair providing the system's XY surface bending moment resistance, the present invention adds a clamping guide pair 437 arranged perpendicular to the direction of the hard rail slide pair in the upper grinding head assembly 4; the clamping guide pair 437 is fixed to the two mounting sides of the spindle box 406 with bolts, and the straightness of the clamping guide pair 437 is straightened with a wedge-shaped guide pressure block 440 so that the clamping guide pair 437 can be used normally, and the clamping guide The other side of the rail pair 437 is fixed on the left pressure plate 103 and the right pressure plate 107 through the clamp pad 439. The installation height of the clamping guide rail pair 437 can be adjusted through the clamp pad 439 to reduce the assembly difficulty caused by processing and assembly errors. The clamping guide rail pair 437 is a pneumatic normally closed clamp, which needs to be ventilated and adjusted multiple times to reach a suitable clamping position. The grating scale 407 is placed at the front end of the spindle box 406, and the grating scale 407 is fixed to the right pressure plate 107 through the grating scale connecting block 438 to achieve closed-loop control of the spindle transmission.

[0041] See Fig.10The sealing and waterproofing between the upper box body 109 and the lower box body 102 has always been a difficult problem. The present invention adopts a sealing and waterproofing structure combining mechanical protection and accordion shield protection, including: a first mechanical protection formed by an outer cover 115 fixed to the bottom of the upper box body 109 and an inner cover 117 fixed to the upper grinding head assembly 4 and capable of moving up and down with the upper grinding head assembly 4; a first inner accordion protection formed by an upper accordion shield 116 having one end fixed to the outer cover 115 and fixed to the inner cover 117 and moving up and down with the inner cover 117; a vertical shield 116 fixed to the upper box body 109 and the outer cover 115 to prevent foreign objects from intruding 14. The lower labyrinth ring 122 fixed to the lower box 102 and the sealing strip 121 provided between the lower box 102 and the lower labyrinth ring 122 for sealing and waterproofing, the sealing strip 118 provided between the lower labyrinth ring 122 (fixed on the feeding part 3 in front of the lower labyrinth ring 122) and the feeding part 3, the second mechanical protection formed by the lower spindle labyrinth ring 119 fixed on the lower grinding head assembly 2 and moving up and down with the lower grinding head assembly 2; the second inner accordion protection formed by the lower accordion shield 120 with one end fixed on the lower labyrinth ring 122 and one end fixed on the lower spindle labyrinth ring 119 and moving up and down with the lower spindle labyrinth ring 119. The grinding fluid and grinding residue during grinding are blocked outside by the mechanical protection, and the water vapor and oil mist are protected and separated by the accordion shield. The advantage of this structure is that the accordion shield does not directly contact the grinding fluid and grinding residue, thereby increasing the service life.

[0042] See Fig.13 —— Fig.15, the Z-axis feed part 6 is used for Z-axis movement of the upper grinding head assembly 4 and the lower grinding head assembly 2 for grinding and feeding. The main functional components of the Z-axis feed part 6 for the upper grinding head assembly 4 include: a Z-axis screw assembly 609 consisting of a screw 6091 fixed on the upper housing 109 and a screw nut 6092 fixed to the upper grinding head assembly 4, a worm wheel 615 fixed to the screw 6091, a worm 613 matched with the worm wheel 615, and a servo motor 630 connected to the worm 613 through a gear mechanism; the screw nut 6092 is fixed to the upper grinding head assembly 4 through a screw nut seat 628, and the upper and lower ends of the screw 6091 are fixed to the upper housing 109 by upper and lower bearing structures respectively, and the upper bearing structure includes a thrust ball bearing seat 620 for positioning the upper end of the screw 6091, a one-way thrust ball bearing 626 and a one-way thrust ball bearing. The one-way thrust ball bearing 627 and the deep groove ball bearing 625 and the deep groove ball bearing 612, the upper fixing seat 619 and the lower fixing seat 610 for positioning and fixing the one-way thrust ball bearing 626 and the one-way thrust ball bearing 627 with the deep groove ball bearing 625 and the deep groove ball bearing 612, the pressure cover 623 and the pressure cover 611 for grinding and pressing the deep groove ball bearing 625 and the deep groove ball bearing 612 respectively, the fixing sleeve 618 for positioning and tightening the upper fixing seat 619 and the lower fixing seat 610, the grinding gasket 624 provided between the fixing sleeve 618 and the upper fixing seat 619, and the waterproof cover 621 for covering the upper bearing structure, wherein the one-way thrust ball bearings 626 and 627 mainly bear the axial force, the deep groove ball bearings 625 and 612 and the screw bearing 605 bears radial force, and the one-way thrust ball bearings 626, 627 and the screw bearing 605 can be pre-tightened by the grinding gasket 624, and the waterproof cover 621 can prevent foreign objects from intruding; the thrust ball bearing seat 620 is fastened to the screw 6091 by the precision locking round nut 622, and the lower bearing structure includes the lower bearing seat 604 and the screw bearing 605 for positioning the lower end of the screw 6091, the spacer 601 and the precision locking round nut 602 for fastening one end of the screw bearing 605, the spacer 608 and the grinding end cover 606 for fastening the other end of the screw bearing 605, and the lip seals 603 and lip seals 607 for sealing the two ends of the screw bearing 605, and the worm gear 615 is fixed to the thrust ball bearing seat 6091 by bolts. 20 in the middle; the gear mechanism includes a driving gear 645 driven by a servo motor 630 and a driven gear 632 meshing with the driving gear 645 and fixed on the worm 613, the driving gear 645 and the driven gear 632 form a primary helical gear transmission, the servo motor 630 is fixed on the worm seat 617 through the motor mounting plate 631, the worm 613 and the driven gear 632 are fixed in place with a sleeve 633, one end and the other end of the worm 613 close to the driven gear 632 are respectively rotatably positioned in the worm seat 617 with a deep groove ball bearing 643 and a single row tapered roller bearing 642 and a single row tapered roller bearing 637, and the deep groove ball bearing 643 is locked with a bearing gland 644 that is matched and ground with a retaining spring;The other end of the worm 613 is provided with a worm adjustment pad 641 and an adjustment seat 640 to adjust the worm 613, and the locking round nut 638 is used to lock the single-row tapered roller bearing 642 and the single-row tapered roller bearing 637. The worm seat 617 is provided with a rear pressure cover 639 covering the other end of the worm 613 and an observation window 614 covering the installation port. The observation window 614 and the rear pressure cover 639 serve as protective covers for the worm seat 617. The worm 613 and the worm wheel 615 form a two-stage worm gear transmission. The thrust ball bearing seat 620 is connected to the screw 6091 and the worm wheel 615 through the flat key 636 and the flat key 635, wherein the flat key 636 is the transmission positioning key between the screw 6091 and the thrust ball bearing seat 620, and the flat key 635 is the transmission positioning key between the thrust ball bearing seat 620 and the worm wheel 615. The bolt 616 and the worm seat adjustment pad 634 are used to adjust the appropriate meshing position of the worm and worm transmission. Through the worm and worm transmission + helical gear transmission + servo motor direct drive, torque transmission and Z-axis self-locking are realized. ;

[0043] The structure of the Z-axis feed part 6 for the lower grinding head assembly 2 is the same as the structure of the Z-axis feed part 6 for the upper grinding head assembly 4, except that the Z-axis screw assembly consists of a screw fixed on the lower box body 102 and a screw nut fixed to the lower grinding head assembly 2.

[0044] See Fig.16 , Fig.17The dressing mechanism 7 is a single-point swing arm dressing mechanism, which is located between the upper and lower grinding wheels of the upper grinding head assembly 4 and the lower grinding head assembly 2, and includes a trimming shaft 722 fixed on the lower box 102, a trimming arm 724 fixed on the trimming shaft 722, an oilstone clamping seat 726 fixed at the front end of the trimming arm 724, a rotating shaft synchronous pulley 704 fixed at the lower end of the trimming shaft 722, a dressing mechanism driving device connected to the rotating shaft synchronous pulley 704 through a synchronous belt 701, and a detection switch for detecting the position of the rotating shaft synchronous pulley 704 corresponding to the lower end of the trimming shaft 722; a synchronous belt tensioning device is provided between the dressing mechanism driving device and the rotating shaft synchronous pulley 704 The upper end of the trimming shaft 722 is spherically matched with the lower box body 102 through the upper bearing seat 719, and an upper bearing seat concave ring 718 is provided between the radially protruding end of the upper bearing seat 719 and the lower box body 102. The upper bearing seat concave ring 718 and the end surface of the upper bearing seat 719 are spherically matched. The trimming arm 724 can conveniently adjust the parallelism between the oilstone movement and the lower grinding wheel plane through the outer spherical surface and the end surface spherical surface. The dressing mechanism driving device includes a servo motor 733 and a planetary reducer 732. The synchronous belt tensioning device includes a hinge seat 728 fixed on the lower box body 102, and a hinge seat 728 provided on the hinge seat 728 through a pin shaft 729. The reducer mounting seat 730, the planetary reducer 732 is mounted on the reducer mounting seat 730; the oilstone clamping seat 726 is fixed on the trimming arm 724 through the flat key 725, the oilstone pressing plate 727 presses the oilstone on the oilstone clamping seat 726, and the trimming arm 724 is swung when the grinding wheel rotates to trim the grinding wheel, and the trimming arm 724 is fastened to the trimming shaft 722 with a key 734 and a bolt through the trimming arm pressing plate 713, and the upper and lower ends of the trimming shaft 722 are rotatably positioned by deep groove ball bearings 720 and single row tapered roller bearings 709, and the upper bearing seat outer spacer 717 and the upper bearing seat upper end cover 723 and the upper bearing seat lower end cover 715 jointly hold the deep groove ball bearing 720 is fastened in the upper bearing seat 719, the inner spacer 716 of the upper bearing seat and the precision locking nut 721 jointly lock the deep groove ball bearing 720, the lip seal 714 is installed in the lower end cover 715 of the upper bearing seat to prevent the intrusion of foreign objects, the outer spacer 708 of the lower bearing seat and the lower bearing seat sealing cover 711 are used to fasten the single-row tapered roller bearing 709 in the lower bearing seat 707 of the knife repair arm, the single-row tapered roller bearing 709 is locked with the precision locking round nut 705, and the lip seal 710 and the water retaining cover 712 are sealed to prevent the intrusion of water and foreign objects, and the knife repair shaft 722 is positioned and locked by the flat key 703 and the baffle 702 to transmit power to the rotating shaft synchronous pulley 704.

[0045] See Fig.18 , Fig.19The dressing mechanism 7 adopts a double diamond roller swing arm dressing mechanism, which is located between the upper and lower grinding wheels of the upper grinding head assembly 4 and the lower grinding head assembly 2, and includes a trimming shaft 722 fixed on the lower box 102, a trimming arm 759 fixed on the trimming shaft 722, a rotating shaft synchronous pulley 704 fixed at the lower end of the trimming shaft 722, a dressing mechanism driving device connected to the rotating shaft synchronous pulley 704 through a synchronous belt 701, and a detection switch for detecting the position of the rotating shaft synchronous pulley 704 corresponding to the lower end of the trimming shaft 722; and also includes a trimming arm 759 provided on the trimming arm 759 through the roller center axis 752. The upper and lower sets of diamond rollers 744 at the front end, the driven pulley 751 fixed on the roller center axis 752, and the roller power transmission system provided on the trimming arm 759 and connected to the driven pulley 751 through the roller synchronous belt 753, and a roller synchronous belt tensioning device is provided between the roller power transmission system and the driven pulley 751; the trimming arm 759 is fastened to the trimming shaft 722 through the trimming arm pressure plate 735 with a key 736 and bolts, and the connection structure between the trimming shaft 722 and the lower box 102, the trimming mechanism driving device and the synchronous belt tensioning device are the same as those of the single-point swing arm type trimming mechanism.

[0046] The roller power transmission system includes a hydraulic motor 739 fixed on the trimming arm 759 through a motor mounting plate 738, and a driving pulley 754 fixed on the rotating shaft of the hydraulic motor 739 and connected to the roller synchronous belt 753; the roller synchronous belt tensioning device includes a motor mounting plate 738 fixed on the trimming arm 759 through screws, a fixing block 741 fixed on the trimming arm 759, and an adjusting bolt provided on the fixing block 741 through a threaded connection for limiting the position of the motor mounting plate 738 on the trimming arm 759. The trimming arm 759 is fastened to the trimming shaft 722 by a key 736 and a bolt through the trimming arm pressure plate 735. The two sets of diamond rollers 744 are fixed to the two ends of the roller center shaft 752 by bolts and pins. The driven pulley 751 is placed in the middle of the roller center shaft 752. The upper and lower ends of the roller center shaft 752 are respectively rotatably positioned in the bearing seat 746 by a single-row tapered roller bearing 748, and then the spacer 743 and the spacer 749 are ground to press the single-row tapered roller bearing 748. The two bearing seats 746 are fixed to the roller mounting seat 7 by bolts. 50, O-ring 742, O-ring 747, lip seal 745 and diamond roller 744 and bearing seat 746 form static seal and mechanical seal to prevent water and foreign objects from intruding and avoid damaging single-row tapered roller bearing 748. Roller mounting seat 750 is bolted to the repairing arm 759 and fixed at the front end of the repairing arm 759. The shaft of the hydraulic motor 739 is positioned and pressed against the transition sleeve 758 by the shaft end baffle 757 and key 740. The transition sleeve 758 and the driving pulley 754 are fastened with key 755 and screws. The motor 739 drives the active pulley 754, and the active pulley 754 drives the driven pulley 751 to rotate with the roller timing belt 753, thereby driving the two sets of diamond rollers 744 to rotate and dress the grinding wheel. The roller timing belt 753 can be disassembled and tensioned by adjusting the adjusting bolts in the roller timing belt tensioning device. The trimming arm 759 and the motor mounting plate 738 are sealed with an O-ring 737, and the mounting hole on the trimming arm 759 corresponding to the active pulley 754 is sealed with an end cover 756 to prevent foreign objects from invading the trimming arm 759.

[0047] When the double-sided grinding machine is working, the lower grinding head assembly 2 and the upper grinding head assembly 4 are driven by the Z-axis feeding part 6 to slide on the rectangular hard rail in the box part 1, and are driven to rotate by the upper and lower spindle driving devices 5 and 8 at the same time. If it is fixed-point grinding, after the lower grinding head assembly 2 and the upper grinding head assembly 4 reach the set position, the pneumatic normally closed clamp is cut off to clamp the guide rail to improve the grinding rigidity; the feeding part 3 accurately feeds the workpiece to ensure continuous feeding, and the upper and lower boxes 109 and 102 adopt a four-corner support angle adjustment method to control the position accuracy of the upper grinding wheel relative to the lower grinding wheel to adapt to the grinding of different workpieces; when the grinding wheel is worn, the dressing mechanism 7 drives the dressing arm 724 to reciprocate through the servo motor 733, which can accurately control the position of the dressing oilstone and better shape the grinding wheel, thereby realizing single-point swing arm dressing of the grinding wheel. The dressing trajectory of the double diamond roller swing arm dressing mechanism is planetary, and the dressing error caused by the speed difference between the inner and outer lines of the grinding wheel is eliminated by the rotation of the diamond roller 744 and the revolution of the dressing arm 759, so as to improve the accuracy of the dressed surface.

Claims

1. A grinding head device for a double-sided grinding machine, characterized in that It includes a box body part, an upper grinding head assembly and a lower grinding head assembly which are symmetrically arranged up and down and supported and installed in the box body part by a hard rail slide rail auxiliary support, an upper spindle driving device and a lower spindle driving device which are symmetrically arranged at the back of the box body part and provide grinding power for the upper grinding head assembly and the lower grinding head assembly respectively, and two groups of Z-axis feed parts which are fixed in the box body part and provide Z-axis feed force for the upper grinding head assembly and the lower grinding head assembly respectively; the upper grinding head assembly includes a spindle box, an upper spindle which is limited by a lower end cylindrical roller bearing, a bidirectional thrust angular contact ball bearing, and a cylindrical roller bearing in the spindle box, a rotary joint connected to the upper end of the upper spindle through a joint seat, a driven pulley connected to the upper spindle through a spline structure and a unloading device arranged on the spindle box, and an upper spindle flange arranged at the lower end of the upper spindle.

2. The grinding head device of the double-sided grinding machine according to claim 1, characterized in that The spline structure includes a spline sleeve connected to the driven pulley and a spline arranged on the upper main shaft. The unloading device includes a pulley fixing seat fixed to the upper end of the main shaft box, an angular contact ball bearing, an outer spacer sleeve, and an inner spacer sleeve arranged between the pulley fixing seat and the spline sleeve. The angular contact ball bearing is fastened with a first spacer sleeve and a precision locking nut at the bottom, and the angular contact bearing is pre-tightened at the top through a grinding end cover, and a first lip sealing ring is provided.

3. The grinding head device of the double-sided grinding machine according to claim 1, characterized in that The lower end cylindrical roller bearing is pre-tightened and fixed in position by grinding the first inner sleeve, labyrinth cover, second inner sleeve, and outer sleeve; the bidirectional thrust angular contact ball bearing is fastened by the sleeve and the first precision locking round nut; the cylindrical roller bearing is pre-tightened and fixed in position by grinding the first inner labyrinth ring, the first outer labyrinth ring, and the second outer labyrinth ring, and the second inner labyrinth ring is used in combination with the second precision locking round nut to fasten the cylindrical roller bearing.

4. The grinding head device of the double-sided grinding machine according to claim 1, characterized in that The upper spindle driving device includes a driving pulley connected to the driven pulley through a spindle synchronous belt and driven by a variable frequency motor, and a motor base for fixing the variable frequency motor; the motor base is hinged to the box body through a hinge mechanism; the hinge mechanism includes a first motor hinge seat and a second motor hinge seat fixed to the box body, and a motor hinge shaft arranged on the first motor hinge seat and the second motor hinge seat and fixed to the motor base.

5. The grinding head device of the double-sided grinding machine according to claim 4, characterized in that A synchronous belt tensioning and adjusting mechanism is provided between the motor base and the box body part 1, and the synchronous belt tensioning and adjusting mechanism includes a support plate fixed on the box body part, a hinge rod hinged on the support plate through a pull rod seat and passing through the motor base through a nut to tighten the motor base toward the box body part, and two tightening screws fixed between the motor base and the support plate for limiting the motor base.

6. The grinding head device of the double-sided grinding machine according to claim 1, characterized in that The Z-axis feeding part includes: a Z-axis screw assembly consisting of a screw fixed on the box body and a screw nut fixed to the upper grinding head assembly, a worm wheel fixed on the screw, a worm matched with the worm wheel, and a servo motor connected to the worm through a gear mechanism; the screw nut is fixed to the upper grinding head assembly through a screw nut seat, and the upper and lower ends of the screw are fixed to the box body by upper and lower bearing structures respectively.

7. The grinding head device of the double-sided grinding machine according to claim 6, characterized in that The upper bearing structure includes a thrust ball bearing seat for positioning the upper end of the screw rod, a first one-way thrust ball bearing and a second one-way thrust ball bearing, and a first deep groove ball bearing and a second deep groove ball bearing, an upper fixed seat and a lower fixed seat for positioning and fixing the first one-way thrust ball bearing and the second one-way thrust ball bearing with the first deep groove ball bearing and the second deep groove ball bearing, a first pressure cover and a second pressure cover for grinding and pressing the first deep groove ball bearing and the second deep groove ball bearing respectively, a fixing sleeve for positioning and tightening the upper fixed seat and the lower fixed seat, a grinding gasket provided between the fixing sleeve and the upper fixed seat, and a waterproof cover for covering the upper bearing structure; the thrust ball bearing seat is fastened to the screw rod by a third precision locking round nut, the worm gear is fixed in the middle of the thrust ball bearing seat, and the thrust ball bearing seat is connected to the screw rod and the worm gear by a first flat key and a second flat key respectively.

8. The grinding head device of the double-sided grinding machine according to claim 6, characterized in that The lower bearing structure includes a lower bearing seat and a screw bearing for positioning the lower end of the screw, a second spacer sleeve and a fourth precision locking round nut for fastening one end of the screw bearing, a third spacer sleeve and a grinding end cover for fastening the other end of the screw bearing, and a second lip sealing ring and a third lip sealing ring for sealing both ends of the screw bearing.

9. The grinding head device of the double-sided grinding machine according to claim 6, characterized in that The gear mechanism includes a driving gear driven by a servo motor and a driven gear meshing with the driving gear and fixed on the worm. The servo motor is fixed on the worm seat through a motor mounting plate. The worm and the driven gear are fixed in place by expansion sleeves. One end and the other end of the worm close to the driven gear are respectively rotatably positioned in the worm seat by a third deep groove ball bearing, a first single-row tapered roller bearing and a second single-row tapered roller bearing. The third deep groove ball bearing is locked by a bearing gland and a retaining spring. A worm adjustment pad and an adjustment seat are provided at the other end of the worm to adjust the worm. The first single-row tapered roller bearing and the third single-row tapered roller bearing are locked by a locking round nut. A rear gland covering the other end of the worm and an observation window covering the mounting opening are provided on the worm seat.

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