CN111360688A - Precision workpiece clamping and positioning device - Google Patents
Precision workpiece clamping and positioning device Download PDFInfo
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- CN111360688A CN111360688A CN202010291810.2A CN202010291810A CN111360688A CN 111360688 A CN111360688 A CN 111360688A CN 202010291810 A CN202010291810 A CN 202010291810A CN 111360688 A CN111360688 A CN 111360688A
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- output shaft
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- fixedly connected
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/02—Lapping machines or devices; Accessories designed for working surfaces of revolution
- B24B37/025—Lapping machines or devices; Accessories designed for working surfaces of revolution designed for working spherical surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor
- B24B15/04—Machines or devices designed for grinding seat surfaces; Accessories therefor on valve members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/27—Work carriers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
The invention discloses a precise workpiece clamping and positioning device, which comprises a workpiece rotation driving device, a workpiece clamping device and a controller, wherein the workpiece rotation driving device comprises a workpiece rotation sun wheel, a workpiece rotation sun wheel input shaft, a workpiece rotation planet wheel output shaft, a servo motor, a fixed seat and a cover plate, the cover plate is arranged at the upper end of the fixed seat, a workpiece rotation planet wheel array is arranged on the periphery of the workpiece rotation sun wheel and is meshed with the workpiece rotation sun wheel, the workpiece rotation sun wheel is fixedly sleeved with the workpiece rotation sun wheel input shaft, the upper end of the workpiece rotation sun wheel input shaft is connected with the cover plate, the lower end of the workpiece rotation sun wheel input shaft penetrates through the fixed seat and is connected with the servo motor, the workpiece rotation planet wheel is fixedly sleeved with the workpiece rotation planet wheel output shaft, and the upper end of the workpiece, Low manufacturing cost, high grinding efficiency, quick and convenient operation, no damage to the smooth finish of the outer surface of the valve seat by clamping, and the like.
Description
Technical Field
The invention relates to the field of machining, in particular to a precise workpiece clamping and positioning device.
Background
As is known, the existing gas-tight valve is sealed by contacting the spherical sealing surface of a sphere with the sealing spherical surface of a valve seat, and the machining precision of the sealing spherical surface in an inner hole of the valve seat directly influences the sealing effect of the gas-tight valve, so that the requirement on the grinding precision of the sealing spherical surface of the inner hole of the valve seat is high, and when the sealing spherical surface of the valve seat is ground, a workpiece clamping device is firstly used for clamping the valve seat to fix the valve seat, and then the grinding is carried out. The outer surface of the inner hole of the valve seat is a sealing surface and is used for being sleeved with the sleeve, the requirement on the finish degree of the outer surface of the valve seat is high, and otherwise, the sealing effect is influenced.
At present, most of manual grinding devices are matched with a workpiece clamping device manually to grind the sealing spherical surface of a valve seat, and a frequently used manual grinding device consists of a grinding ball, a connecting rod and a grinding handle, wherein the grinding ball is fixedly connected with one end of the connecting rod, the grinding ball and the connecting rod are inserted into an inner hole of the valve seat from an opening above the valve seat, and the other end of the connecting rod penetrates out of an opening below the valve seat and is detachably and fixedly connected with the grinding handle; the work holding device may employ: for example, CN2019109709942 discloses a workpiece concentric clamping device and a clamping method, wherein three clamping blocks are driven by forward and reverse lead screws and guide rods to move at the same distance to clamp the outer surface of a circular workpiece; for example, CN2019102911134 discloses an automatic clamping device, which drives a pressing claw on a clamping mechanism to automatically clamp a circular workpiece through an air cylinder.
The operation method for grinding the sealing spherical surface of the valve seat comprises the following steps: the valve seat is fixed through the workpiece clamping device, then the grinding handle is manually rotated by a worker to drive the grinding ball to rotate, the sealing spherical surface of the inner hole of the valve seat is ground, after grinding is completed, the workpiece clamping device is loosened, the processed valve seat is taken out, the grinding handle is detached, and the grinding ball is taken out from an opening above the valve seat.
The disadvantages of this structure are: firstly, the inner hole sealing spherical surface is ground manually, the valve seat is fixed and cannot rotate relative to the grinding ball in the grinding process, grinding is realized only through rotation of the grinding ball, the labor intensity of workers is high, and the grinding efficiency is low; secondly, the existing workpiece clamping device is complex in structure, the workpiece is clamped by being driven by a driving device, the equipment purchasing cost is high, and meanwhile, the rapid clamping and fixing of a valve seat cannot be realized, so that the machining efficiency of the workpiece is influenced; the outer surface of the valve seat is a sealing surface, and the outer side of the valve seat is easy to deform in the clamping process of the conventional workpiece clamping device on the valve seat, so that the smoothness of the outer surface of the valve seat is damaged, the sealing effect of the outer surface of the valve seat is poor, and the using effect and the service life of the valve seat are influenced.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides the precision workpiece clamping and positioning device which has the advantages of novel structure, low manufacturing cost, high grinding efficiency, rapidness and convenience in operation and no damage to the smoothness of the outer surface of the valve seat in clamping.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a precision workpiece presss from both sides tight positioner which characterized in that: the workpiece rotary driving device comprises a workpiece rotary driving device, a workpiece clamping device and a controller, wherein the workpiece rotary driving device comprises a workpiece rotary sun gear, a workpiece rotary sun gear input shaft, a workpiece rotary planet gear output shaft, a servo motor, a fixed seat and a cover plate, the cover plate is arranged at the upper end of the fixed seat and covers the fixed seat, the workpiece rotary sun gear and the workpiece rotary planet gear are arranged between the cover plate and the fixed seat, the workpiece rotary planet gear array is arranged on the periphery of the workpiece rotary sun gear and is meshed with the workpiece rotary sun gear, the workpiece rotary sun gear is fixedly sleeved with the workpiece rotary sun gear input shaft, the upper end of the workpiece rotary sun gear input shaft is fixedly connected with the cover plate through a second bearing, the lower end of the workpiece rotary planet gear array is fixedly connected with the fixed seat through a first bearing and penetrates out of the fixed seat to be fixedly connected, the workpiece rotating planetary gear is fixedly sleeved with the workpiece rotating planetary gear output shaft, the upper end of the workpiece rotating planetary gear output shaft is fixedly connected with the cover plate through the second bearing and penetrates out of the cover plate to be fixedly connected with the workpiece clamping device, the lower end of the workpiece rotating planetary gear output shaft is fixedly connected with the fixing seat through the first bearing and penetrates out of the fixing seat, the workpiece rotating sun gear and the workpiece rotating planetary gear are driven by the servo motor to rotate so as to drive the workpiece clamping device to rotate reversely with the grinding tool, and the grinding efficiency is improved.
The workpiece rotation driving device further comprises a fixing nut, the lower end of the workpiece rotation planetary gear output shaft penetrates through the fixing seat and is in threaded connection with the fixing nut, a shaft shoulder is arranged at the upper end of the workpiece rotation planetary gear output shaft and is abutted against the inner ring of the second bearing, and the fixing nut and the shaft shoulder are arranged to axially fix the workpiece rotation planetary gear output shaft and maintain the axial position.
The invention adopts a wedge-shaped locking device, a wedge-shaped block placing groove and a valve seat placing groove are arranged on an output shaft of the workpiece rotating planet wheel, a front groove wall and a rear groove wall of the wedge-shaped block placing groove are arranged in parallel and are respectively vertical to a bottom groove wall, one side groove wall of the wedge-shaped block placing groove is an inclined surface, the other side of the wedge-shaped block placing groove is communicated with the valve seat placing groove, the wedge-shaped locking device comprises a wedge-shaped block, a fastening bolt and an expansion spring, the upper end surface and the lower end surface of the wedge-shaped block are arranged in parallel, the front end surface and the rear end surface are arranged in parallel and are respectively vertical to the upper end surface and the lower end surface, one side end surface of the wedge-shaped block is a guide inclined surface, the other side end surface is an arc-shaped surface, the wedge-shaped block is placed in the wedge-shaped, the wedge is through fastening bolt, the tight spring that expands and work piece rotatory planet wheel output shaft threaded connection, will wait to process the work piece through wedge locking device and fix in the disk seat standing groove, presss from both sides tightly and waits to process the work piece and fix a position, prevents to loosen and takes off, uses the wedge locking to wait to process the work piece and can not cause the disk seat outside to warp.
The first bearing adopts a first thrust ball bearing and a second thrust ball bearing, the workpiece rotating planet wheel output shaft and the workpiece rotating sun wheel input shaft respectively penetrate out of the fixed seat through the first thrust ball bearing and the second thrust ball bearing, a shaft ring of the thrust ball bearing rotates along with the shaft and is attached to the rotating piece, and the thrust ball bearing is used for bearing axial load.
The invention has the beneficial effects that: the precise workpiece clamping and positioning device adopts a planetary gear structure, and a servo motor can drive a plurality of workpiece clamping devices to rotate to be matched with the grinding cutter for grinding, so that the manufacturing cost of equipment is greatly saved, and the grinding efficiency is improved; the workpiece to be machined is positioned through the wedge-shaped locking device, the structure is simple, the valve seat can be quickly and quickly installed and fixed, the concentricity of the grinding tool and the axial center hole of the valve seat to be machined is guaranteed, the grinding tool is enabled to realize accurate grinding, the precision requirement of grinding is guaranteed, deformation of the outer side of the valve seat cannot be caused by the wedge block locking, the smooth finish of the outer surface of the valve seat is high, and the sealing effect is good.
Drawings
FIG. 1 is a schematic view of the overall structure of the clamping and positioning device for precision workpieces according to the present invention.
FIG. 2 is a schematic view of the overall structure of the clamping and positioning device for precision workpieces according to the present invention.
FIG. 3 is a schematic view of the overall structure of the precision workpiece clamping and positioning device of the present invention with the cover removed.
FIG. 4 is a front view of the precision workpiece clamping and positioning device of the present invention.
Fig. 5 is a sectional view a-a in fig. 4.
FIG. 6 is a schematic view showing the overall structure of the wedge-shaped locking device of the present invention.
FIG. 7 is a schematic structural diagram of a wedge-shaped locking device of the invention arranged on an output shaft of a workpiece rotating planet wheel.
Fig. 8 is a schematic structural view of a valve seat placing groove and a wedge block placing groove of the invention.
Fig. 9 is a schematic view of a valve seat to be machined.
Fig. 10 is a sectional view taken along line B-B in fig. 9.
Fig. 11 is a schematic view of the overall structure of the present invention in practical use.
Fig. 12 is a cross-sectional view taken along line D-D of fig. 11.
Reference numerals: pillar-1, top plate-2, bottom plate-3, guide shaft-4, planetary gear grinding device-5, tool rotating sun gear-501, tool rotating sun gear input shaft-502, tool rotating planet gear-503, tool rotating planet gear output shaft-504, first servo motor-505, first fixed seat-506, first cover plate-507, grinding tool-508, expansion spring-509, fixed sleeve-510, tool fixed screw-511, first thrust ball bearing-514, second thrust ball bearing-515, first fixed nut-516, precision workpiece clamping and positioning device-6, workpiece rotating sun gear-601, workpiece rotating sun gear input shaft-602, workpiece rotating planet gear-603, workpiece rotating planet gear output shaft-604, and, The device comprises a second servo motor-605, a second fixed seat-606, a second cover plate-607, a wedge-608, a fastening bolt-609, an expansion spring-610, a shaft shoulder-611, a valve seat placing groove-612, a wedge placing groove-613, a third thrust ball bearing-614, a fourth thrust ball bearing-615, a second fixed nut-616, a cylinder-7, a transmitting sensor-8, a receiving sensor-9 and a valve seat-10.
Detailed Description
The invention is described below with reference to the accompanying drawings and examples. The structure of the present invention is used in a high precision internal bore sealed spherical grinding device in the following examples, which are a general description of the practical use of the present invention. Fig. 1-10 are related views of the structure of the invention, and fig. 11-12 are schematic views of the whole structure of a high-precision inner hole sealing spherical grinding device.
As shown in the attached drawing, the high-precision inner hole sealing spherical surface grinding device comprises a supporting frame, a guide device, a planetary gear grinding device, a precise workpiece clamping and positioning device, a linear driving mechanism and a controller, wherein the linear driving mechanism and the planetary gear grinding device are controlled by the controller, the supporting frame comprises a top plate 2, a bottom plate 3 and a support column 1, the top plate 2 is positioned above the bottom plate 3, the top plate 2 and the bottom plate 3 are fixedly connected through the support column 1 in a bolt or welding mode, the linear driving mechanism is fixed on the top plate 2, the precise workpiece clamping and positioning device 6 is fixed on the bottom plate 3, a planetary gear grinding device 5 is arranged between the top plate 2 and the bottom plate 3, the planetary gear grinding device 5 is in sliding connection with the support column 1 through the guide device, the linear driving mechanism drives the planetary gear grinding device 5 to move up and down along the support column 1, the planetary gear grinding device is driven to move downwards to be close to the precise workpiece clamping and positioning device under the action of the linear driving mechanism so as to grind the workpiece.
The planetary gear grinding device 5 comprises a tool rotation sun gear 501, a tool rotation sun gear input shaft 502, a tool rotation planet gear 503, a tool rotation planet gear output shaft 504, a first servo motor 505, a first fixed seat 506, a first cover plate 507 and a grinding tool 508, wherein the first fixed seat 506 is connected with the pillar 1 through a guiding device, the upper end of the first fixed seat 506 is provided with the first cover plate 507, the first cover plate is provided with a downward concave cavity in the embodiment, the first cover plate 507 covers the first fixed seat 506 and is fixedly connected with the first fixed seat, the tool rotation sun gear 501 and the tool rotation planet gear 503 are arranged between the first cover plate 507 and the first fixed seat 506, the tool rotation planet gear 503 array is arranged on the periphery of the tool rotation sun gear 501 and is meshed with the tool rotation sun gear 501, the tool rotation sun gear 501 is fixedly sleeved with the tool rotation sun gear input shaft 502, in this embodiment, the key is embedded in the key groove to be fixedly sleeved by forming the key groove on the shaft and the gear, the lower end of the tool rotating sun gear input shaft 502 is fixedly connected with the first fixing seat 506 through the first bearing, the upper end of the tool rotating sun gear input shaft 502 is fixedly connected with the first cover plate 507 through the second bearing and penetrates out of the first cover plate 507 to be fixedly connected with the output shaft of the first servo motor 505, the upper end of the first servo motor 505 is fixedly connected with the telescopic rod of the linear driving mechanism, the first servo motor 505 is connected with the controller, the tool rotating planet gear 503 is fixedly sleeved with the tool rotating planet gear output shaft 504, the upper end of the tool rotating planet gear output shaft 504 is fixedly connected with the first cover plate 507 through the second bearing and penetrates out of the first cover plate, the lower end of the tool rotating planet gear output shaft 504 is fixedly connected with the first fixing seat 506 through the first, the precision workpiece clamping and positioning device is used for clamping a workpiece to be machined, the planetary gear grinding device moves downwards under the action of the linear driving mechanism to be close to the workpiece to be machined, the first servo motor drives the cutter to rotate the sun gear and the cutter to rotate the planet gear so as to drive the grinding cutter to rotate to grind the workpiece to be machined, and the planetary gear grinding device moves upwards along the support under the action of the linear driving mechanism after grinding is completed. In the embodiment, the linear driving mechanism uses the air cylinder 7, the top plate is provided with an opening, the air cylinder shell is fixed on the top plate through a bolt, a piston rod of the air cylinder penetrates through the opening of the top plate and is fixedly connected with the upper end of the first servo motor, and the linear driving mechanism can also be driven by a hydraulic cylinder, an electric cylinder and the like.
The precise workpiece clamping and positioning device 6 comprises a workpiece rotating sun gear 601, a workpiece rotating sun gear input shaft 602, a workpiece rotating planet gear 603, a workpiece rotating planet gear output shaft 604, a second servo motor 605, a second fixing seat 606, a second cover plate 607 and a workpiece clamping device, the precise workpiece clamping and positioning device 6 is controlled by a controller, and the precise workpiece clamping and positioning device is connected with a strut by a guide device;
the second fixed seat 606 is connected with the pillar 1 through a guiding device, in this embodiment, the second fixed seat is provided with a cavity with an upward opening, the upper end of the second fixed seat 606 is provided with a second cover plate 607, the second cover plate 607 covers the second fixed seat 606 and is fixedly connected with the second fixed seat, a workpiece rotating sun wheel 601 and a workpiece rotating planet wheel 603 are arranged between the second cover plate 607 and the second fixed seat 606, the workpiece rotating planet wheels 603 are arranged on the periphery of the workpiece rotating sun wheel 601 in an array and are meshed with the workpiece rotating sun wheel 601, the workpiece rotating sun wheel 601 is fixedly sleeved with a workpiece rotating sun wheel input shaft 602, in this embodiment, the shaft and the gear are fixedly sleeved in a way of forming key slots and embedding keys into the key slots, the upper end of the workpiece rotating sun wheel input shaft 602 is fixedly connected with the second cover plate 607 through a fourth bearing, and the lower end of the workpiece rotating sun wheel input shaft is fixedly connected with the second fixed seat 606, the workpiece rotating planet wheel 604 is fixedly sleeved with the workpiece rotating planet wheel output shaft 604, the upper end of the workpiece rotating planet wheel output shaft 604 is fixedly connected with a second cover plate 607 through a fourth bearing and penetrates out of the second cover plate 607 to be fixedly connected with a workpiece clamping device, the lower end of the workpiece rotating planet wheel output shaft is fixedly connected with a second fixing seat through a third bearing and penetrates out of the second fixing seat, and the second servo motor drives the workpiece rotating sun wheel and the workpiece rotating planet wheel to rotate so as to drive the workpiece clamping device to rotate with the grinding tool at the same speed and in the reverse direction, so that the grinding efficiency is improved.
The planetary gear grinding device 5 further comprises a first fixing nut 516, the upper end of the tool rotating planetary gear output shaft 504 penetrates out of the first cover plate 507 and is in threaded connection with the first fixing nut, the first fixing nut can use a hexagon nut or a round nut, a first shaft shoulder is arranged at the lower end of the tool rotating planetary gear output shaft 504, the first shaft shoulder is abutted to the inner ring of the first bearing, and the first fixing nut and the first shaft shoulder are arranged to axially fix the tool rotating planetary gear output shaft and maintain the axial position. In this embodiment, the upper end of the input shaft of the rotary sun gear of the cutter penetrates through the first cover plate and is also in threaded connection with the first fixing nut, the lower end of the input shaft of the rotary sun gear of the cutter is provided with a first shaft shoulder, the first shaft shoulder is abutted against the inner ring of the first bearing, and the input shaft of the rotary sun gear of the cutter is axially fixed by the first fixing nut and the first shaft shoulder.
The precision workpiece clamping and positioning device 6 further comprises a second fixing nut 616, the lower end of the workpiece rotating planetary wheel output shaft 604 penetrates out of the second fixing seat 606 and is in threaded connection with the second fixing nut 616, the second fixing nut can use a hexagon nut or a round nut, a second shoulder is arranged at the upper end of the workpiece rotating planetary wheel output shaft 604 and is abutted to the inner ring of the fourth bearing, and the second shoulder and the second fixing nut are arranged to axially fix the workpiece rotating planetary wheel output shaft and maintain the axial position. In this embodiment, the lower end of the input shaft of the rotary sun gear of the workpiece penetrates through the second fixing seat and is also in threaded connection with the second fixing nut, the upper end of the input shaft of the rotary sun gear of the workpiece is provided with a second shoulder, the second shoulder is abutted against the inner ring of the fourth bearing, and the second fixing nut and the second shoulder are arranged to axially fix the input shaft of the rotary sun gear of the tool.
The workpiece clamping device adopts a wedge-shaped locking device, the upper end of the output shaft of the workpiece rotating planet wheel is provided with a wedge block placing groove 613 and a valve seat placing groove 612, the front groove wall and the rear groove wall of the wedge block placing groove are arranged in parallel and are respectively vertical to the groove wall at the bottom, the groove wall at one side of the wedge block placing groove 613 is an inclined surface, the other side of the wedge block placing groove is communicated with the valve seat placing groove 612, the wedge-shaped locking device comprises a wedge block 608, a fastening bolt 609 and an expansion spring 610, the upper end surface and the lower end surface of the wedge block are arranged in parallel, the front end surface and the rear end surface are arranged in parallel and are respectively vertical to the upper end surface and the lower end surface, one end surface of the wedge block 608 is a guide inclined surface, the other end surface is an arc-shaped surface, the wedge block is placed in the wedge block placing groove, the guide inclined surface of the wedge, wedge 608 is through fastening bolt 609, the tight spring 610 that expands and the rotatory planet wheel output shaft threaded connection of cutter, will wait to process the work piece through wedge locking device and fix in the disk seat standing groove, presss from both sides tightly and waits to process the work piece and fixes a position, prevents to loosen and take off, uses the wedge locking to wait to process the work piece and can not cause the disk seat outside to warp.
The lower end of the first fixing seat 506 is fixedly connected with an emitting sensor 8, the upper end of the second cover plate 607 is fixedly connected with a receiving sensor 9, the emitting sensor 8 is positioned right above the receiving sensor 9, the emitting sensor 8 and the receiving sensor 9 are respectively connected with a controller, the distance between the planetary gear grinding device and the precision workpiece clamping and positioning device is measured through the emitting sensor 8 and the receiving sensor 9 in a correlation mode, and the concentricity of a grinding cutter and a shaft center hole of a workpiece to be machined is detected. In the embodiment, in order to prevent equipment from colliding, when the position of the grinding tool reaches the position 10mm above the valve seat to be machined, the transmitting sensor and the receiving sensor are matched to send out signals and feed back the position, the air cylinder slowly descends, and the grinding tool stops when reaching the position of the valve seat.
A buffer device is arranged between the grinding tool 508 and the tool rotating planet wheel output shaft 504, the grinding tool is fixedly connected with the tool rotating planet wheel output shaft through the buffer device, the buffer device comprises a fixed sleeve 510, a telescopic spring 509, a tool fixing screw 511 and a buffer baffle plate (not numbered in the figure), the lower end of the tool rotating planet wheel output shaft is provided with a groove with a downward opening, a boss (not numbered in the figure) is arranged outside the fixed sleeve, the upper end of the fixed sleeve extends into the groove and is fixedly connected with the groove, the boss is abutted against the lower end face of the tool rotating planet wheel output shaft 504, the tool fixing screw 511 is movably inserted in the axis of the fixed sleeve, the lower end of the tool fixing screw 511 is in threaded connection with the grinding tool 508, the buffer baffle plate is fixedly connected with the upper end of the grinding tool 508, and the telescopic spring 509 is sleeved, the upper end of expanding spring 509 is contradicted with fixed cover boss, and the lower extreme is contradicted with buffer baffle, be equipped with direction keyway (not shown in the figure) on the fixed cover hole lateral wall, one side fixedly connected with direction key (not shown in the figure) of cutter set screw, grinding tool 508 reciprocates along the direction keyway through the direction key, through setting up buffer to make grinding tool reciprocate along the direction keyway under expanding spring's effect, make grinding tool with wait to process work piece buffering contact, the cooperation of direction key and direction keyway prevents grinding tool circumferential direction simultaneously.
The guide device adopts the guide shaft, the guide shaft 4 is provided with four, one end of four guide shafts is respectively fixedly connected with four vertex angles of the bottom plate, the other end is fixedly connected with four vertex angles of the top plate through a precise workpiece clamping and positioning device and a planetary gear grinding device, in the embodiment, through holes for the guide shafts to pass are formed in the first fixing seat, the first cover plate, the second fixing seat and the four vertex angles of the second cover plate, and after the lower end of the guide shaft is fixedly connected with the upper end of the bottom plate, the upper end of the guide shaft sequentially passes through the second fixing seat, the second cover plate, the first fixing seat and the lower end of the top plate after being fixedly connected. The linear driving mechanism drives the planetary gear grinding device to move up and down along the guide shaft, and can also be realized by using a guide slide rail.
The second bearings adopt a first thrust ball bearing 514 and a second thrust ball bearing 515, the cutter rotating planet wheel output shaft 504 and the cutter rotating sun wheel input shaft 502 respectively penetrate out of the first cover plate 507 through the first thrust ball bearing 514 and the second thrust ball bearing 515, the upper end of the first thrust ball bearing is a first seat ring, the lower end of the first thrust ball bearing is a first shaft ring, the cutter rotating planet wheel output shaft and the cutter rotating sun wheel input shaft are respectively and fixedly connected with the first shaft ring, the first shaft ring rotates along with the shaft and is attached to the gear, the first seat ring is fixedly connected with the first cover plate, the upper end of the second thrust ball bearing is a second seat ring, the lower end of the second thrust ball bearing is a second seat ring, the cutter rotating planet wheel output shaft and the cutter rotating sun wheel input shaft are respectively and fixedly connected with the second shaft ring, the second shaft ring rotates along with the shaft and is attached to the first fixing nut, the second, the third bearing adopts a third thrust ball bearing 614 and a fourth thrust ball bearing 615, the workpiece rotating planet wheel output shaft 504 and the workpiece rotating sun wheel input shaft 502 respectively penetrate out of the second fixing seat 606 through the third thrust ball bearing 614 and the fourth thrust ball bearing 615, the upper end of the third thrust ball bearing is a third shaft ring, the lower end of the third thrust ball bearing is a third seat ring, the workpiece rotating planet wheel output shaft and the workpiece rotating sun wheel input shaft are respectively and fixedly connected with the third shaft ring, the third shaft ring rotates along with the shaft and is attached to the gear, the third seat ring is fixedly connected with the second fixing seat, the upper end of the fourth thrust ball bearing is a fourth seat ring, the lower end of the fourth thrust ball bearing is a fourth shaft ring, the workpiece rotating planet wheel output shaft and the workpiece rotating sun wheel input shaft are respectively and fixedly connected with the fourth shaft ring, the fourth shaft ring rotates along with the shaft and is attached to the second fixing nut, and the fourth seat ring is fixedly connected, the thrust ball bearing has a collar that rotates with the shaft and that engages the rotating member, and is used to bear an axial load by using the thrust ball bearing.
In this embodiment, the sealing spherical surface of the inner hole of the valve seat needs to be machined, and the machined part is shown as a part C in fig. 10.
The controller used in this embodiment is a PLC controller.
As shown in the drawing, six planet gears are arranged in the embodiment, and the number of the planet gears can be determined according to actual requirements. The size of the cutter rotating sun wheel is the same as that of the workpiece rotating sun wheel, and the size of the cutter rotating planet wheel is the same as that of the workpiece rotating planet wheel, so that the grinding cutter is positioned right above the sealing spherical surface of the valve seat to be machined.
When the device is used, firstly, a valve seat to be processed is placed in a valve seat placing groove, a wedge block is placed in the wedge block placing groove, a fastening bolt is screwed by a hexagonal wrench, the position of the wedge block is fixed, the valve seat is clamped, a starting button is pressed on a control panel, a PLC (programmable logic controller) is started, a piston rod of an air cylinder moves downwards to drive a planetary gear grinding device to move downwards, a transmitting sensor and a receiving sensor are matched to detect the distance between the planetary gear grinding device and a precision workpiece clamping and positioning device, when a grinding cutter is detected to reach a position 10MM above the valve seat, the air cylinder slowly descends, the transmitting sensor and the receiving sensor are matched to detect that the air cylinder reaches the valve seat grinding position, and a program controls the air cylinder piston rod. After a start button is pressed down, a PLC controller drives a first servo motor and a second servo motor to rotate at the same speed in the reverse direction, the first servo motor and the second servo motor both rotate 10 revolutions per second, a cutter rotating sun wheel input shaft drives a cutter rotating sun wheel to rotate clockwise, a cutter rotating planet wheel is driven to drive a cutter rotating planet wheel output shaft to rotate anticlockwise, a grinding cutter rotates anticlockwise, a workpiece rotating sun wheel input shaft drives a workpiece rotating sun wheel to rotate anticlockwise, the workpiece rotating planet wheel is driven to drive a workpiece rotating planet wheel output shaft to rotate clockwise, a valve seat rotates clockwise, when the grinding cutter reaches a valve seat grinding position, the grinding cutter is in buffer contact with a valve seat sealing spherical surface under the action of a telescopic spring and rotates in the reverse direction to grind, the grinding time is 20 minutes once, and after grinding is completed, an air cylinder drives a planet gear grinding device to move upwards to return to, and simultaneously, the first servo motor and the second servo motor stop driving to finish machining. And unscrewing the fastening bolt on the wedge-shaped block by a hexagonal wrench, taking out the machined valve seat, and replacing the valve seat to be machined again. An emergency stop button is arranged on the control panel, and the emergency control equipment can be controlled to stop through the emergency stop button in the machining process.
The invention has the beneficial effects that: the precise workpiece clamping and positioning device adopts a planetary gear structure, and a servo motor can drive a plurality of workpiece clamping devices to rotate to be matched with the grinding cutter for grinding, so that the manufacturing cost of equipment is greatly saved, and the grinding efficiency is improved; the workpiece to be machined is positioned through the wedge-shaped locking device, the structure is simple, the valve seat can be quickly and quickly installed and fixed, the concentricity of the grinding tool and the axial center hole of the valve seat to be machined is guaranteed, the grinding tool is enabled to realize accurate grinding, the precision requirement of grinding is guaranteed, deformation of the outer side of the valve seat cannot be caused by the wedge block locking, the smooth finish of the outer surface of the valve seat is high, and the sealing effect is good.
Claims (4)
1. The utility model provides a precision workpiece presss from both sides tight positioner which characterized in that: the workpiece rotary driving device comprises a workpiece rotary driving device, a workpiece clamping device and a controller, wherein the workpiece rotary driving device comprises a workpiece rotary sun gear, a workpiece rotary sun gear input shaft, a workpiece rotary planet gear output shaft, a servo motor, a fixed seat and a cover plate, the cover plate is arranged at the upper end of the fixed seat and covers the fixed seat, the workpiece rotary sun gear and the workpiece rotary planet gear are arranged between the cover plate and the fixed seat, the workpiece rotary planet gear array is arranged on the periphery of the workpiece rotary sun gear and is meshed with the workpiece rotary sun gear, the workpiece rotary sun gear is fixedly sleeved with the workpiece rotary sun gear input shaft, the upper end of the workpiece rotary sun gear input shaft is fixedly connected with the cover plate through a second bearing, the lower end of the workpiece rotary planet gear array is fixedly connected with the fixed seat through a first bearing and penetrates out of the fixed seat to be fixedly connected, the workpiece rotating planetary gear is fixedly sleeved with the workpiece rotating planetary gear output shaft, the upper end of the workpiece rotating planetary gear output shaft is fixedly connected with the cover plate through a second bearing and penetrates out of the cover plate to be fixedly connected with the workpiece clamping device, and the lower end of the workpiece rotating planetary gear output shaft is fixedly connected with the fixing seat through a first bearing and penetrates out of the fixing seat.
2. A workpiece holding apparatus as claimed in claim 1, characterised in that: the workpiece rotation driving device further comprises a fixing nut, the lower end of the workpiece rotation planetary wheel output shaft penetrates out of the fixing seat and is in threaded connection with the fixing nut, a shaft shoulder is arranged at the upper end of the workpiece rotation planetary wheel output shaft, and the shaft shoulder is abutted to the inner ring of the second bearing.
3. A workpiece holding apparatus as claimed in claim 1 or 2, characterised in that: the workpiece clamping device adopts a wedge-shaped locking device, a wedge-shaped block placing groove and a valve seat placing groove are arranged on the workpiece rotating planet wheel output shaft, the front groove wall and the rear groove wall of the wedge-shaped block placing groove are arranged in parallel and are respectively perpendicular to the bottom groove wall, one side groove wall of the wedge-shaped block placing groove is an inclined surface, the other side of the wedge-shaped block placing groove is communicated with the valve seat placing groove, the wedge-shaped locking device comprises a wedge block, a fastening bolt and an expansion spring, the upper end surface and the lower end surface of the wedge block are arranged in parallel, the front end surface and the rear end surface are arranged in parallel and are respectively perpendicular to the upper end surface and the lower end surface, one side end surface of the wedge block is a guide inclined surface, the other side end surface is an arc-shaped surface, the wedge block is placed in the wedge-shaped block placing groove, the guide inclined surface of the wedge block is, The expansion spring is in threaded connection with the workpiece rotating planet wheel output shaft.
4. A workpiece holding apparatus as claimed in claim 1 or 2, characterised in that: the first bearing adopts a first thrust ball bearing and a second thrust ball bearing, and the workpiece rotating planet wheel output shaft and the workpiece rotating sun wheel input shaft respectively penetrate out of the fixed seat through the first thrust ball bearing and the second thrust ball bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010291810.2A CN111360688A (en) | 2020-04-14 | 2020-04-14 | Precision workpiece clamping and positioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010291810.2A CN111360688A (en) | 2020-04-14 | 2020-04-14 | Precision workpiece clamping and positioning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111360688A true CN111360688A (en) | 2020-07-03 |
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ID=71203319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010291810.2A Pending CN111360688A (en) | 2020-04-14 | 2020-04-14 | Precision workpiece clamping and positioning device |
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| Country | Link |
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| CN (1) | CN111360688A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116275303A (en) * | 2023-05-18 | 2023-06-23 | 苏州市怡泰智能装备有限公司 | Automatic change manufacturing numerical control lathe |
-
2020
- 2020-04-14 CN CN202010291810.2A patent/CN111360688A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116275303A (en) * | 2023-05-18 | 2023-06-23 | 苏州市怡泰智能装备有限公司 | Automatic change manufacturing numerical control lathe |
| CN116275303B (en) * | 2023-05-18 | 2023-08-01 | 苏州市怡泰智能装备有限公司 | Automatic change manufacturing numerical control lathe |
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