CN210588668U - Composite grinding machine tool with middle driving and two-end grinding functions - Google Patents

Abstract

The utility model discloses a composite grinding machine tool with middle drive and two-end grinding, which comprises a numerical control system and a hydraulic system, and also comprises a middle clamping and driving mechanism arranged on the machine tool body, wherein both sides of the middle clamping and driving mechanism are respectively provided with a grinding wheel mechanism driven by a grinding wheel displacement mechanism; the left side of the middle clamping and driving mechanism is provided with an inner circle grinding wheel mechanism, and the right side of the middle clamping and driving mechanism is provided with an outer circle grinding wheel mechanism; the right side of the middle clamping and driving mechanism is provided with a jacking mechanism driven by a hydraulic system, and the hydraulic system drives the jacking mechanism to eject or retract; after the servo motor drives the workpiece clamping device to drive the workpiece to rotate, grinding starts when the jacking mechanism is ejected out, the outer circle grinding wheels respectively positioned at two sides of the jacking mechanism grind the outer circle of the workpiece, and the inner circle grinding wheels grind the inner hole of the workpiece; and after the grinding is finished, the jacking mechanism retracts. The utility model discloses can be both ends about grinding the part simultaneously under the circumstances of a clamping to guaranteed the axiality requirement of high accuracy, production efficiency is high, and the machining precision is high, can reduce the processing cost of enterprise, reduces the equipment investment.

Description

Composite grinding machine tool with middle driving and two-end grinding functions

Technical Field

The utility model belongs to the technical field of the lathe, a compound grinding lathe of middle drive both ends grinding is related to.

Background

Under the condition that inner holes or outer circles at two ends of a part need to be ground, the requirement on the grinding coaxiality is high, and the existing machining process is finished by respectively machining two ends of the part through an inner grinding machine and another outer grinding machine. For high-precision and mass production type enterprises, the processing mode not only has low processing efficiency, dispersed working procedures and large occupied area because the coaxiality of the products clamped twice is not easy to guarantee, but also has high cost in the aspects of equipment, personnel and the like, thereby undoubtedly increasing the production cost for the enterprises, and effectively controlling the quality of the products.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem provide a compound grinding lathe of middle drive both ends grinding can carry out the grinding to the both ends hole or the excircle of part simultaneously, guarantees the hole of product part and the axiality processing requirement of excircle.

The utility model discloses a realize through following technical scheme:

a composite grinding machine tool with middle drive and two-end grinding comprises a numerical control system, a hydraulic system and a middle clamping and driving mechanism arranged on a machine body, wherein grinding wheel mechanisms driven by a grinding wheel displacement mechanism are respectively arranged on two sides of the middle clamping and driving mechanism;

the middle clamping and driving mechanism comprises a fixed arm fixedly connected with the lathe bed, and the workpiece clamping device is connected with the fixed arm through a rotating shaft; the workpiece clamping device is also connected with the servo motor and is driven by the servo motor to rotate;

the grinding wheel mechanism comprises a grinding wheel mounting seat arranged on the grinding wheel displacement mechanism, a grinding wheel spindle is fixed on the grinding wheel mounting seat, and a grinding wheel is mounted at the end part of the grinding wheel spindle through a clamping mechanism; the grinding wheel positioned on one side of the middle clamping and driving mechanism is an inner circle grinding wheel, the grinding wheel positioned on the other side is an outer circle grinding wheel, and the side is also provided with a jacking mechanism matched with the workpiece clamping device;

the grinding wheel displacement mechanism comprises a transverse displacement mechanism and a longitudinal displacement mechanism which are arranged in a laminated mode, and the transverse displacement mechanism and the longitudinal displacement mechanism drive the grinding wheel mechanism to move along the X axis and the Y axis respectively.

The left side of the middle clamping and driving mechanism is provided with an inner circle grinding wheel mechanism, and the right side of the middle clamping and driving mechanism is provided with an outer circle grinding wheel mechanism; the right side of the middle clamping and driving mechanism is provided with a jacking mechanism driven by a hydraulic system, and the hydraulic system drives the jacking mechanism to eject or retract;

after the servo motor drives the workpiece clamping device to drive the workpiece to rotate, grinding starts when the jacking mechanism is ejected out, the outer circle grinding wheels respectively positioned at two sides of the jacking mechanism grind the outer circle of the workpiece, and the inner circle grinding wheels grind the inner hole of the workpiece; and after the grinding is finished, the jacking mechanism retracts.

The workpiece clamping device comprises a rotating device and a clamping device, the rotating device comprises a mounting seat and a synchronous belt mechanism driven by a servo motor, the clamping device is connected with the rotating device through a rotating shaft, and the synchronous belt mechanism drives the clamping device to rotate; the clamping device adopts a clamping block, a film chuck clamping mechanism or a chuck clamping mechanism to clamp the workpiece in a hydraulic clamping mode;

the grinding wheel mechanism also comprises a grinding wheel protective cover which is fixed on the grinding wheel seat shell.

Grinding wheel mechanism side still set and repair sand mechanism, repair sand mechanism including setting up the diamond point pen of repairing on repairing the mechanism seat.

The transverse displacement mechanism comprises an upper sliding plate which is driven by a lead screw and can transversely move on the guide rail, the upper sliding plate is fixedly connected with the lead screw, two ends of the lead screw are respectively supported by bearings, one end of the lead screw is also connected with a driving servo motor through a coupler, and the bearings are fixedly connected through a bearing seat; the bottom end of the upper sliding plate is provided with a sliding block, the upper end surface of the guide rail is embedded in the sliding block, and the lower end of the guide rail is fixed on the bed body; the upper sliding plate is connected with the lathe bed through an upper limiting block and a lower limiting block respectively;

the longitudinal displacement mechanism comprises an upper sliding plate which is driven by a lead screw and can transversely move on the guide rail, the upper sliding plate is fixedly connected with the lead screw, the lead screw with bearings at two ends is connected with a driving servo motor through a coupler, and the bearings are fixedly connected with a bearing seat through nut seats; the bottom of the upper sliding plate is provided with a sliding block, the upper end surface of the guide rail is embedded in the sliding block, and the lower end of the longitudinal guide rail is fixed on the upper sliding plate of the transverse displacement mechanism.

The transverse displacement mechanism and the longitudinal displacement mechanism respectively drive the grinding wheel mechanism to move along an X axis and a Y axis under the control of a numerical control system:

the numerical control system outputs instructions through the displacement controller to enable the servo motor to rotate, then the screw rod is driven to rotate through the coupler, the screw rod nut changes the rotation motion into linear motion, the transverse displacement mechanism and the longitudinal displacement mechanism are driven to do linear motion along the X axis or the Y axis along the linear guide rail, and the linear displacement depends on the rotary encoder of the servo motor and the screw pitch of the screw rod.

The machine tool is also provided with a cooling system which comprises a cooling box, a cooling pump, a pipeline and a cooling spray head; the cooling box is located at the left rear position of the lathe bed, cooling liquid in the cooling box is conveyed to the cooling spray head through the cooling pump through a pipeline, and the cooling spray head sprays the cooling liquid to cool heat generated by grinding of the workpiece.

The machine body is also provided with an external circle on-line detector which is arranged at the front end of a grinding workpiece, is opposite to a grinding wheel and consists of a control instrument, a measuring part and a hydraulic cylinder;

the measuring part comprises a measuring probe connected with a measuring head through a measuring rod, the measuring probe is always kept in contact with the outer circular surface of the workpiece in the grinding process, when the workpiece reaches a set tolerance value, the displacement of the measuring probe is transmitted to the measuring head through the measuring rod, and the measuring head converts a displacement signal into an electric signal and then transmits the electric signal to the controller; the signal received by the controller is transmitted to a numerical control system of the machine tool; the numerical control system sends an instruction to the hydraulic cylinder, and the hydraulic cylinder drives the measuring part to be separated from the contact with the excircle of the workpiece.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model provides a composite grinding machine tool with middle drive and two-end grinding, which clamps a workpiece by a middle clamping and driving mechanism, and drives the workpiece to rotate by a servo motor after the workpiece is clamped; the two sides of the middle clamping and driving mechanism are respectively provided with an inner circle grinding wheel mechanism and an outer circle grinding wheel mechanism; after the workpiece is clamped and rotated, the outer circle grinding wheel grinds the outer circle of the workpiece, and the inner circle grinding wheel grinds the inner hole of the workpiece, so that one-time clamping is realized, the inner holes or the outer circles at two ends of the part are ground, and the coaxiality of the part is strictly ensured.

The utility model provides a compound grinding lathe of middle drive both ends grinding, compact structure, degree of automation is high, can grind the left and right ends of part simultaneously under the circumstances of a clamping, can guarantee the axiality requirement of high accuracy, production efficiency is high, and the machining precision is high, still has the online measurement function, guarantees the processingquality of product; the machining cost of an enterprise can be reduced to a great extent, the equipment investment is reduced, and the grinding machine is ideal equipment for simultaneously grinding and machining parts at two ends; the investment of enterprises on equipment can be reduced to a great extent, and the occupied area is saved.

Drawings

FIG. 1-1 is a schematic view of the overall structure of the present invention;

fig. 1-2 are a second schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the intermediate clamping and driving device;

FIG. 3 is a schematic structural view of a left side grinding wheel mechanism;

FIG. 4 is a schematic structural view of the left lateral displacement mechanism;

FIG. 5 is a schematic view of the left longitudinal displacement mechanism;

FIG. 6 is a schematic view of the upper slide plate connection;

FIG. 7 is a schematic view of the connection of the lead screw, the guide rail and the driving mechanism;

FIG. 8 is a schematic view of the right side grinding wheel mechanism;

FIG. 9 is a schematic view of the right lateral displacement mechanism;

FIG. 10 is a schematic view of the right-side longitudinal displacement mechanism;

FIG. 11 is a second schematic view of the right longitudinal displacement mechanism;

FIG. 12 is a schematic structural diagram of an external circle on-line detector;

FIG. 13 is a schematic view of simultaneous inner bore and outer cylindrical grinding;

wherein, 1 is a middle clamping and driving mechanism, 2 is a left grinding wheel mechanism, 3 is a right grinding wheel mechanism, and 4 is a jacking mechanism; 5 is a transverse displacement mechanism, 6 is a longitudinal displacement mechanism, 7 is a lathe bed, and 8 is a grinding wheel renovating mechanism; a middle servo motor 9, a rotating device 10, a clamping device 11 and a fixed arm mounting seat 12;

601 is a grinding wheel mounting seat, 602 is a main shaft, and 603 is a grinding wheel;

501 is a left lateral sliding plate, 502 is a left lateral driving servo motor, 503 is a left lateral lead screw, 504 is a left lateral bearing, 505 is a left lateral guide rail, and 506 is a left lateral coupling; 507 left lateral bearing seat;

401 is a left longitudinal upper sliding plate, 402 is a left longitudinal guide rail, 403 is a left longitudinal servo motor, 404 is a left longitudinal screw, 405 is a left longitudinal bearing, 406 is a left longitudinal coupler, 407 is a left longitudinal bearing seat, 406 is a left longitudinal upper limit block, and 407 is a left longitudinal lower limit block;

101 is an upper sliding plate, 102 is a guide rail, 103 is a sliding block, 104 is a bearing seat, and 105 is a nut seat;

801 is a right grinding wheel spindle, 802 is a grinding spindle, 803 is a right grinding wheel, and 804 is a grinding wheel protective cover;

901 is a right lateral sliding plate, 903 is a right lateral driving servo motor, 904 is a right lateral screw rod, 905 is a right lateral bearing, 906 is a right lateral coupling, 907 is a right lateral guide rail, and 908 is a right lateral bearing seat;

1002 is a right longitudinal upward sliding plate, 1003 is a right longitudinal guide rail, 1004 is a right longitudinal bearing seat, 1005 is a right longitudinal servo motor, and 1006 is a right longitudinal screw rod;

301 is a supporting seat, 302 is a transition plate, 303 is a hydraulic oil cylinder, 307 is an oil cylinder supporting seat, 304 is a measuring probe, 305 is a measuring rod, and 306 is a measuring head.

Detailed Description

The present invention will now be described in further detail with reference to the attached drawings, which are provided for purposes of illustration and not limitation.

Referring to fig. 1-13, in order to realize the simultaneous grinding of the left and right ends of a part under the condition of one-time clamping, the utility model provides a composite grinding machine tool with middle drive and two-end grinding on the basis of the existing machine tool, which comprises a numerical control system and a hydraulic system (the existing machine tool can be adopted or the adaptability adjustment can be carried out), and also comprises a middle clamping and driving mechanism arranged on the machine tool body, and both sides of the middle clamping and driving mechanism are respectively provided with a grinding wheel mechanism driven by a grinding wheel displacement mechanism;

the middle clamping and driving mechanism comprises a fixed arm fixedly connected with the lathe bed, and the workpiece clamping device is connected with the fixed arm through a rotating shaft; the workpiece clamping device is also connected with the servo motor and is driven by the servo motor to rotate;

the grinding wheel mechanism comprises a grinding wheel mounting seat arranged on the grinding wheel displacement mechanism, a grinding wheel spindle is fixed on the grinding wheel mounting seat, and a grinding wheel is mounted at the end part of the grinding wheel spindle through a clamping mechanism; the grinding wheel positioned on one side of the middle clamping and driving mechanism is an inner circle grinding wheel, the grinding wheel positioned on the other side is an outer circle grinding wheel, and the side is also provided with a jacking mechanism matched with the workpiece clamping device;

the grinding wheel displacement mechanism comprises a transverse displacement mechanism and a longitudinal displacement mechanism which are arranged in a laminated mode, and the transverse displacement mechanism and the longitudinal displacement mechanism drive the grinding wheel mechanism to move along the X axis and the Y axis respectively.

Further, referring to fig. 1-2, the left side of the intermediate clamping and driving mechanism is provided with an inner circle grinding wheel mechanism, and the right side is provided with an outer circle grinding wheel mechanism; the right side of the middle clamping and driving mechanism is provided with a jacking mechanism driven by a hydraulic system, and the hydraulic system drives the jacking mechanism to eject or retract;

after the servo motor drives the workpiece clamping device to drive the workpiece to rotate, grinding starts when the jacking mechanism is ejected out, the outer circle grinding wheels respectively positioned at two sides of the jacking mechanism grind the outer circle of the workpiece, and the inner circle grinding wheels grind the inner hole of the workpiece; and after the grinding is finished, the jacking mechanism retracts.

Specifically, the jacking mechanism is positioned at the right end of the middle clamping and driving mechanism, and the numerical control system controls a hydraulic system connected with the jacking mechanism to realize the ejection and retraction of the jacking mechanism. And the ejection and grinding of the ejection mechanism are started, and the ejection and grinding are finished, so that the ejection tip is withdrawn. The workpiece can be assembled and disassembled after the jacking mechanism returns, and the workpiece can be ground after jacking.

Referring to fig. 2, the workpiece clamping device comprises a rotating device and a clamping device, the rotating device comprises a mounting seat and a synchronous belt mechanism driven by a servo motor, the clamping device is connected with the mounting seat of the rotating device through a rotating shaft, and the synchronous belt mechanism drives the clamping device to rotate; the clamping device adopts a clamping block, a film chuck clamping mechanism or a chuck clamping mechanism to clamp the workpiece in a hydraulic clamping mode.

Specifically, the workpiece clamping device comprises two parts: the first part is a driving and rotating device which takes a servo motor as a power source and comprises a mounting seat and a synchronous belt mechanism for transmitting power, so that the workpiece clamping device is rotated; the second part is a workpiece clamping device, and three alternatives are provided for the second part: 1. clamping by a clamping block; 2. clamping by a film chuck; 3. and (5) clamping by using a precision chuck. The clamping manner is by hydraulic clamping. After the workpiece is clamped, the servo motor drives the workpiece clamping device to drive the workpiece to rotate, the outer circle grinding wheels on the two sides of the workpiece grind the outer circle of the workpiece, and the inner circle grinding wheels grind the inner hole of the workpiece. The outer circle and the inner hole are respectively ground by one-time clamping, so that the requirement of coaxiality and high precision of the outer circle and the inner hole can be met.

Referring to fig. 3, the grinding wheel mechanism includes a grinding wheel mounted on a grinding wheel base, a spindle, a grinding wheel mounting flange and a grinding wheel protective cover; the grinding wheel spindle is arranged in the grinding wheel base shell, and the grinding wheel is clamped by a flange plate and then is arranged at the end part of the spindle; the grinding wheel protective cover is fixed on the grinding wheel seat shell. The grinding wheel mounting seat is arranged on the grinding wheel displacement mechanism.

Referring to fig. 4-11, the lateral displacement mechanism includes an upper slide plate driven by a lead screw and capable of moving laterally on a guide rail, the upper slide plate is fixedly connected with the lead screw, two ends of the lead screw are respectively supported by bearings, one end of the lead screw is further connected with a driving servo motor through a coupling, and the bearings are fixedly connected through a bearing seat; the bottom end of the upper sliding plate is provided with a sliding block, the upper end surface of the guide rail is embedded in the sliding block, and the lower end of the guide rail is fixed on the bed body; the upper sliding plate is connected with the lathe bed through an upper limiting block and a lower limiting block respectively;

the longitudinal displacement mechanism comprises an upper sliding plate which is driven by a lead screw and can transversely move on the guide rail, the upper sliding plate is fixedly connected with the lead screw, the lead screw with bearings at two ends is connected with a driving servo motor through a coupler, and the bearings are fixedly connected with a bearing seat through nut seats; the bottom of the upper sliding plate is provided with a sliding block, the upper end surface of the guide rail is embedded in the sliding block, and the lower end of the longitudinal guide rail is fixed on the upper sliding plate of the transverse displacement mechanism.

Further, the transverse displacement mechanism and the longitudinal displacement mechanism respectively drive the grinding wheel mechanism to move along the X axis and the Y axis under the control of a numerical control system:

the numerical control system outputs instructions through the displacement controller to enable the servo motor to rotate, then the screw rod is driven to rotate through the coupler, the screw rod nut changes the rotation motion into linear motion, the transverse displacement mechanism and the longitudinal displacement mechanism are driven to do linear motion along the X axis or the Y axis along the linear guide rail, and the linear displacement depends on the rotary encoder of the servo motor and the screw pitch of the screw rod.

Specifically, the servo motor rotates, the screw rod is driven to rotate through the coupler, the screw rod nut changes the rotation motion into linear motion, and the X shaft and the Y shaft are driven to do linear motion along the linear guide rail. The linear displacement is calculated by a servo motor rotary encoder and a screw pitch.

Furthermore, grinding wheel mechanism side still set and repair sand mechanism, repair sand mechanism including setting up the diamond pen of repairing on repairing the mechanism seat. Its effect has two: firstly, sharpening a dull grinding wheel; and secondly, the grinding wheel is shaped and finished to meet the shape requirement of a grinding workpiece.

Furthermore, a cooling system is also arranged on the machine tool and comprises a cooling box, a cooling pump, a pipeline and a cooling spray head; the cooling box is located at the left rear position of the lathe bed, cooling liquid in the cooling box is conveyed to the cooling spray head through the cooling pump through a pipeline, and the cooling spray head sprays the cooling liquid to cool heat generated by grinding of the workpiece. Specifically, the cooling box is located at the left rear position of the lathe bed, and the cooling liquid is conveyed to the cooling spray head through the pipeline to cool heat generated by grinding, so that thermal deformation is prevented.

Referring to fig. 12, the lathe bed is further provided with an external circle on-line detector which is arranged at the front end of the grinding workpiece and is opposite to the grinding wheel and consists of a controller, a measuring part and a hydraulic oil cylinder;

the measuring part comprises a measuring probe connected with a measuring head through a measuring rod, the measuring probe is always kept in contact with the outer circular surface of the workpiece in the grinding process, when the workpiece reaches a set tolerance value, the displacement of the measuring probe is transmitted to the measuring head through the measuring rod, and the measuring head converts a displacement signal into an electric signal and then transmits the electric signal to the controller; the signal received by the controller is transmitted to a numerical control system of the machine tool; the numerical control system sends an instruction to the hydraulic cylinder, and the hydraulic cylinder drives the measuring part to be separated from the contact with the excircle of the workpiece.

Specifically, the measuring unit comprises an upper measuring unit and a lower measuring unit, the upper measuring unit and the lower measuring unit are always in contact with the grinding surface of the workpiece in the grinding process, the diameter of the workpiece is reduced along with the increase of the grinding amount, when the expected set tolerance value is reached, the displacement of the measuring units is amplified by the measuring rod and then transmitted to the measuring head, and the measuring head converts displacement signals into electric signals and then transmits the electric signals to the controller; the controller further amplifies the signal and transmits the amplified signal to the numerical control system; the numerical control system sends out an instruction to control the electromagnetic valve of the hydraulic oil cylinder to work, so that oil liquid is reversed, and the hydraulic oil cylinder returns.

The basis states above, the utility model provides a lathe sets up middle clamping and drive arrangement on the lathe bed, and middle clamping and drive arrangement sets up in the middle of left and right grinding wheel mechanism, is used for holding the part and rotates, and the middle clamping and drive arrangement left side is left side grinding wheel mechanism, is driven by left side transverse displacement mechanism and left side longitudinal displacement mechanism fixed on the lathe bed, can realize the interpolation of left side emery wheel and Y axle and move the grinding; the right side of the middle clamping and driving mechanism is provided with a right grinding wheel mechanism which is driven by a right lateral transverse displacement mechanism and a right longitudinal displacement mechanism fixed on the lathe bed, so that the interpolation moving grinding of the X axis and the Y axis of the right grinding wheel can be realized; the grinding machine has the advantages that the left end and the right end of a part can be simultaneously ground under the condition of one-time clamping, the requirement on high-precision coaxiality can be guaranteed, the production efficiency is high, the machining precision is high, the machining cost of an enterprise can be reduced to a great extent, the equipment investment is reduced, and the grinding machine is ideal equipment for simultaneously grinding the part at the two ends

Referring to the workpiece described in fig. 13, after the workpiece is clamped by the middle clamping and driving device, the inner hole of the workpiece is ground by the left side, and the outer circle of the workpiece is ground by the right side.

The embodiments given above are preferred examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical features of the technical solution of the present invention by those skilled in the art all belong to the protection scope of the present invention.

Claims (9)

1. A composite grinding machine tool with middle drive and two-end grinding comprises a numerical control system and a hydraulic system and is characterized by also comprising a middle clamping and driving mechanism arranged on a machine body, wherein grinding wheel mechanisms driven by a grinding wheel displacement mechanism are respectively arranged on two sides of the middle clamping and driving mechanism;

the middle clamping and driving mechanism comprises a fixed arm fixedly connected with the lathe bed, and the workpiece clamping device is connected with the fixed arm through a rotating shaft; the workpiece clamping device is also connected with the servo motor and is driven by the servo motor to rotate;

the grinding wheel mechanism comprises a grinding wheel mounting seat arranged on the grinding wheel displacement mechanism, a grinding wheel spindle is fixed on the grinding wheel mounting seat, and a grinding wheel is mounted at the end part of the grinding wheel spindle through a clamping mechanism; the grinding wheel positioned on one side of the middle clamping and driving mechanism is an inner circle grinding wheel, the grinding wheel positioned on the other side is an outer circle grinding wheel, and the side is also provided with a jacking mechanism matched with the workpiece clamping device;

the grinding wheel displacement mechanism comprises a transverse displacement mechanism and a longitudinal displacement mechanism which are arranged in a laminated mode, and the transverse displacement mechanism and the longitudinal displacement mechanism drive the grinding wheel mechanism to move along the X axis and the Y axis respectively.

2. The intermediate drive, double end grinding compound grinding machine of claim 1 wherein said intermediate clamping and drive mechanism has an inner grinding wheel mechanism on the left and an outer grinding wheel mechanism on the right; the right side of the middle clamping and driving mechanism is provided with a jacking mechanism driven by a hydraulic system, and the hydraulic system drives the jacking mechanism to eject or retract;

after the servo motor drives the workpiece clamping device to drive the workpiece to rotate, grinding starts when the jacking mechanism is ejected out, the outer circle grinding wheels respectively positioned at two sides of the jacking mechanism grind the outer circle of the workpiece, and the inner circle grinding wheels grind the inner hole of the workpiece; and after the grinding is finished, the jacking mechanism retracts.

3. A compound grinding machine of middle drive and double end grinding as set forth in claim 1 or 2, characterized in that said workpiece clamping device comprises a rotating device and a clamping device, said rotating device comprises a mounting seat and a synchronous belt mechanism driven by a servo motor, the clamping device is connected with the rotating device through a rotating shaft, the synchronous belt mechanism drives the clamping device to rotate; the clamping device adopts a clamping block, a film chuck clamping mechanism or a chuck clamping mechanism to clamp the workpiece in a hydraulic clamping mode.

4. A mid-drive, double-end grinding compound grinding machine as defined in claim 1 wherein said wheel mechanism further includes a wheel guard secured to the wheel block housing.

5. A compound grinding machine with intermediate drive and double end grinding as set forth in claim 1 wherein a dressing mechanism is provided beside said grinding wheel mechanism, said dressing mechanism comprising a dressing diamond pen mounted on a dressing mechanism holder.

6. A compound grinding machine tool with middle drive and two-end grinding as claimed in claim 1, wherein the transverse displacement mechanism comprises an upper slide plate which is driven by a lead screw and can transversely move on a guide rail, the upper slide plate is fixedly connected with the lead screw, two ends of the lead screw are respectively supported by bearings, one end of the lead screw is also connected with a drive servo motor through a coupling, and the bearings are fixedly connected through a bearing seat; the bottom end of the upper sliding plate is provided with a sliding block, the upper end surface of the guide rail is embedded in the sliding block, and the lower end of the guide rail is fixed on the bed body; the upper sliding plate is connected with the lathe bed through an upper limiting block and a lower limiting block respectively;

the longitudinal displacement mechanism comprises an upper sliding plate which is driven by a lead screw and can transversely move on the guide rail, the upper sliding plate is fixedly connected with the lead screw, the lead screw with bearings at two ends is connected with a driving servo motor through a coupler, and the bearings are fixedly connected with a bearing seat through nut seats; the bottom of the upper sliding plate is provided with a sliding block, the upper end surface of the guide rail is embedded in the sliding block, and the lower end of the longitudinal guide rail is fixed on the upper sliding plate of the transverse displacement mechanism.

7. The intermediate-drive double-end-grinding composite grinding machine tool as claimed in claim 1, 2 or 6, wherein the transverse displacement mechanism and the longitudinal displacement mechanism drive the grinding wheel mechanism to move along the X axis and the Y axis respectively under the control of a numerical control system:

the numerical control system outputs instructions through the displacement controller to enable the servo motor to rotate, then the screw rod is driven to rotate through the coupler, the screw rod nut changes the rotation motion into linear motion, the transverse displacement mechanism and the longitudinal displacement mechanism are driven to do linear motion along the X axis or the Y axis along the linear guide rail, and the linear displacement depends on the rotary encoder of the servo motor and the screw pitch of the screw rod.

8. A compound grinding machine tool with intermediate drive and two-end grinding as claimed in claim 1, wherein the machine tool is further provided with a cooling system which comprises a cooling tank, a cooling pump, a pipeline and a cooling spray head; the cooling box is located at the left rear position of the lathe bed, cooling liquid in the cooling box is conveyed to the cooling spray head through the cooling pump through a pipeline, and the cooling spray head sprays the cooling liquid to cool heat generated by grinding of the workpiece.

9. The compound grinding machine with the middle drive and the two ends grinding as claimed in claim 1, characterized in that the machine body is also provided with an external circle on-line detector which is arranged at the front end of the grinding workpiece and is opposite to the grinding wheel and consists of a controller, a measuring part and a hydraulic oil cylinder;

the measuring part comprises a measuring probe connected with a measuring head through a measuring rod, the measuring probe is always kept in contact with the outer circular surface of the workpiece in the grinding process, when the workpiece reaches a set tolerance value, the displacement of the measuring probe is transmitted to the measuring head through the measuring rod, and the measuring head converts a displacement signal into an electric signal and then transmits the electric signal to the controller; the signal received by the controller is transmitted to a numerical control system of the machine tool; the numerical control system sends an instruction to the hydraulic cylinder, and the hydraulic cylinder drives the measuring part to be separated from the contact with the excircle of the workpiece.

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