CN220699150U - Symmetrical plane wire drawing device capable of self-adjusting according to workpiece size - Google Patents

Abstract

The utility model discloses a symmetrical plane wire drawing device capable of self-adjusting according to the size of a workpiece, which comprises a frame, a left distance sensor, a right distance sensor, a conveying device, a left belt sander, a right belt sander and a centering device; the conveying device is connected with the device frame through a bracket, and left and right distance sensors are arranged at the left and right sides of the initial position of the conveying device; the belt sander on the left side and the belt sander on the right side are of symmetrical structures, and mainly comprise a bottom plate, a driving motor, a guide wheel, a tensioning mechanism, a centering top plate and a jacking cylinder, wherein the bottom of the belt sander is connected with a frame through a linear guide rail; the bottom of the frame is provided with a centering device, and the centering device consists of a driving motor, a bearing with a seat, a left screw rod, a right screw rod and a coupler; the device can automatically adjust the distance between the left belt sander and the right belt sander, is suitable for processing products with different sizes, does not need to manually select processing programs of different workpieces, improves the production efficiency, and has higher applicability.

Description

Symmetrical plane wire drawing device capable of self-adjusting according to workpiece size

Technical Field

The utility model relates to the technical field of machining automation, in particular to a symmetrical plane wire drawing device capable of self-adjusting according to the size of a workpiece.

Background

At present, in the field of machining automation, wire drawing treatment is an important surface treatment process, and has important significance for reducing surface defects of workpieces and improving the quality of the surfaces of square valve body workpieces. In the prior art, the automatic wire drawing equipment mostly adopts a down-pressing type abrasive belt machine to draw wires on one side, and the condition of the surface to be processed of a workpiece is judged manually, so that the existing down-pressing type abrasive belt machine only draws wires on one side of the workpiece at a time, and the other side of the workpiece is required to be clamped again after the single-side processing is finished. Meanwhile, the down-pressing abrasive belt machine can only confirm the type of a workpiece by manpower, and selects a machining program corresponding to the workpiece, so that the working efficiency is affected.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide a symmetrical plane wire drawing device which is self-adjusting according to the size of a workpiece; the specific technical scheme is as follows:

a symmetrical plane wire drawing device capable of self-adjusting according to the size of a workpiece comprises a frame, a left distance sensor, a right distance sensor, a conveying device, a left belt sander, a right belt sander, a centering device and a linear guide rail; the conveying device is arranged at the center of the upper end surface of the rack, and the right-side distance sensor of the left-side distance sensor is respectively arranged at the front ends of the two sides of the conveying device; the left abrasive belt machine and the right abrasive belt machine are respectively arranged on two sides of a wire drawing position of the conveying device; the left abrasive belt machine and the right abrasive belt machine are respectively connected with the frame through linear guide rails; the frame is rectangle, and the center is equipped with two symmetrical rectangular position holes of keeping away, and centering device sets up in the frame bottom.

According to the symmetrical plane wire drawing device capable of self-adjusting according to the size of the workpiece, the left side distance sensor, the right side distance sensor, the left side belt sander and the right side belt sander are symmetrically arranged relative to the conveying device.

The symmetrical plane wire drawing device capable of self-adjusting according to the size of a workpiece is characterized in that the left abrasive belt machine and the right abrasive belt machine are of symmetrical structures with the same structure, and the symmetrical plane wire drawing device comprises a bottom plate, a guide wheel, a motor, a first synchronous pulley, a top pressing cylinder, a top pressing plate linear bearing, a guide shaft, a second synchronous pulley, a strut for a notch type tension spring, a tensioning pulling plate, a tensioning wheel, a belt seat bearing, an abrasive belt, a driving wheel, an adapter plate and a centering plate; the front end of the bottom plate is provided with two bearing with seats, a guide wheel is arranged in the bearing with seats, and the bottom of the guide wheel is connected with the bearing with seats through a shaft snap spring; an air cylinder bracket is arranged between the two guide wheels at the front end, the bottom of the air cylinder bracket is connected with the bottom plate through a screw, and a jacking air cylinder is arranged on the air cylinder bracket; the upper end of the jacking cylinder is provided with a magnetic induction switch III and a magnetic induction switch IV, and the side wall of the jacking cylinder is provided with a throttle valve a; the front end of the jacking cylinder is provided with an adapter plate, four linear bearings are arranged on the adapter plate, a guide shaft is inserted into the linear bearings, a spigot structure is processed at the rear end of the guide shaft and used for limiting the guide shaft to slide forwards, and the front end of the guide shaft is of an external thread structure and is connected with a threaded hole at the back of the jacking plate; a compression spring is arranged on a guide shaft between the top pressing plate and the adapter plate, and constant pressure is provided for the front end of the top pressing plate through the structure; the bottom of the tensioning wheel is fixedly connected with the tensioning pulling plate through two screws, a rotating shaft structure is processed on the other side of the tensioning pulling plate, and the tensioning pulling plate is connected with the bearing with the seat through a clamping spring for a shaft; the side of the tensioning pulling plate is provided with a hole type support column for the tension spring, the notch type support column for the tension spring is arranged on the bottom plate, and the tension spring is arranged between the hole type support column for the tension spring and the notch type support column for the tension spring; the bottom of the driving wheel is provided with a first synchronous pulley, the driving wheel is fixedly connected with the first synchronous pulley through a set screw and a key, and a rotating shaft at the bottom of the driving wheel is connected with a bearing with a seat through a shaft by using a clamp spring; a motor bracket is arranged on one side of the driving wheel, the motor is connected with the motor bracket through a screw, a synchronous belt pulley II is arranged at the front end of an output shaft of the motor, and the motor and the synchronous belt pulley II are fixedly connected through a set screw and a key; a synchronous belt for transmitting power is arranged between the synchronous belt wheel II and the synchronous belt wheel I; the outer rings of the guide wheel, the driving wheel and the tensioning wheel are provided with abrasive belts; the centering pressure plate is arranged at the front end of the bottom plate.

The symmetrical plane wire drawing device is characterized in that the centering device comprises a servo motor, a servo motor bracket, a first coupler, a fixed side belt seat bearing, a belt sander connecting plate, a right-handed screw, a supporting side belt seat bearing, a second coupler and a left-handed screw; the servo motor is arranged at the bottom of the frame through a servo motor bracket; the second coupler is used for connecting the right-hand screw rod and the left-hand screw rod together, and the right-hand screw rod and the left-hand screw rod are supported by the fixed side bearing with the seat and the support side bearing with the seat and fixed on the frame; the left-handed screw rod and the right-handed screw rod are connected with a main shaft of the servo motor through a second coupler and a first coupler; and the nuts of the right-handed screw rod and the left-handed screw rod are connected with a belt sander connecting plate, and the belt sander connecting plate penetrates through a strip mounting hole in the center of the frame to be connected with belt sander bottom plates of the left-side belt sander and the right-side belt sander.

The symmetrical plane wire drawing device is characterized in that the conveying device comprises an electric actuator, a bracket, a carrier plate, a pressing block, a material ejection cylinder, a first magnetic induction switch, a second magnetic induction switch and a throttle valve b; the lower end face of the bracket is connected with the rack through a screw, and the upper end of the bracket is provided with an electric actuator; the support plate is of an L-shaped structure, the front end of the support plate is provided with a limiting step, and the support plate is connected with a sliding block of the electric actuator through a screw; the end face of the carrier plate is provided with a material ejection cylinder, and the material ejection cylinder is provided with a magnetic induction switch I, a magnetic induction switch II and a throttle valve b; the front end of the jacking cylinder is provided with a jacking block, and a workpiece is placed on a carrier plate at the front end of the jacking block.

According to the symmetrical plane wire drawing device capable of self-adjusting according to the size of the workpiece, the preferable scheme is that a strip hole in the center of the frame is reserved with a movement space.

According to the symmetrical plane wire drawing device capable of self-adjusting according to the size of the workpiece, the preferable scheme is that the centering pressing plate is of an L-shaped extending structure and is used for centering the workpiece.

According to the symmetrical plane wire drawing device capable of self-adjusting according to the size of the workpiece, the tensioning wheel is preferably a self-rotating guide wheel.

According to the symmetrical plane wire drawing device capable of self-adjusting according to the size of the workpiece, the servo motor is preferably capable of recording the current positions of all parts according to the controller.

According to the symmetrical plane wire drawing device capable of automatically adjusting according to the size of the workpiece, the preferable scheme is that the pressing block is preferably processed by soft polyurethane, so that the workpiece is prevented from being damaged by pressing.

The working process of the symmetrical plane wire drawing device self-adjusting according to the size of a workpiece comprises the following steps: when the device works, a workpiece is placed on a carrier plate of a conveying device, the front end of the workpiece is aligned with the step position of an L-shaped structure of the carrier plate, equipment is started, a piston rod of a jacking cylinder stretches out to prop against the workpiece, and the distance between two pairs of surfaces to be processed of the workpiece is calculated in a control system through feedback signals of a left-side distance sensor and a right-side distance sensor; the electric actuator of the conveying device drives the workpiece to reach a centering station, the piston rod of the ejection cylinder is retracted, the centering pressing plates on the left abrasive belt machine and the right abrasive belt machine are driven by the centering device to perform centering operation on the workpiece according to the distance between the two pairs of surfaces to be processed of the workpiece calculated by the control system, after the centering action is completed, the piston rod of the ejection cylinder stretches out again to prop against the workpiece, and the left abrasive belt machine and the right abrasive belt machine are far away from the workpiece for a certain distance; the electric actuator of the conveying device drives the workpiece to reach the wire drawing station, the motors on the left abrasive belt machine and the right abrasive belt machine are started to drive the abrasive belt to start moving, the left abrasive belt machine and the right abrasive belt machine are driven by the centering device to approach the workpiece according to the distance between two opposite sides of the workpiece to be machined calculated by the control system, after reaching a specified distance, the piston rods of the jacking cylinders on the left abrasive belt machine and the right abrasive belt machine extend out, the jacking plates connected to the front ends of the jacking cylinders enable the abrasive belt to be in contact with the two opposite sides of the workpiece to be machined, constant pressure is provided for the jacking plates through the compression springs, the guide shafts and the linear bearings, the jacking cylinders retract the piston rods after keeping for a certain time according to the wire drawing effect requirement of the surface of the workpiece, the servo motors of the centering device are started to drive the left abrasive belt machine and the right abrasive belt machine to be far away from the workpiece, the electric actuator of the conveying device drives the workpiece to reach the initial station, and the piston rods of the jacking cylinders retract, and the finished workpiece is taken down.

The beneficial effects of the utility model are as follows:

the utility model can simultaneously process symmetrical planes on two sides of a workpiece, automatically identify the dimension of the surface to be processed of the workpiece and automatically change the distance between the left abrasive belt machine and the right abrasive belt machine according to the dimension of the workpiece, does not need to write a large number of processing programs suitable for all kinds of workpieces in advance, does not need to manually select the processing programs, reduces the programming workload of a control system, and reduces the manual participation of equipment operation, so that the device has higher applicability.

The mechanism can effectively improve the production efficiency, reduce the labor intensity, and the control program can judge the current position state of the mechanism through the magnetic induction switch on the air cylinder and the motor encoder, thereby facilitating the initialization and the reset of equipment, so that the utility model has higher fault tolerance and improves the feasibility.

Drawings

FIG. 1 is a schematic diagram of a symmetrical plane wire drawing apparatus self-adjusting according to the size of a workpiece;

FIG. 2 is a schematic view of the bottom structure of a symmetrical plane wire drawing apparatus self-adjusting according to the size of a workpiece;

FIG. 3 is a schematic diagram of a conveyor;

FIG. 4 is a schematic view of a belt sander;

FIG. 5 is a schematic diagram of the arrangement of the guide wheels, the drive wheels, and the tensioning wheels;

FIG. 6 is a schematic illustration of a centering device;

FIG. 7 is a schematic illustration of an initial station of a symmetrical plane wiredrawing apparatus that is self-adjusting according to workpiece dimensions;

FIG. 8 is a schematic illustration of a centering station of a symmetrical plane wiredrawing apparatus that is self-adjusting according to workpiece size;

fig. 9 is a drawing station schematic diagram of a symmetrical plane drawing apparatus self-adjusting according to workpiece size.

In the figure: 1. a frame; 2. a left side distance sensor; 3. a right side distance sensor; 4. a transfer device; 5. a left abrasive belt machine; 6. a right abrasive belt machine; 7. a centering device; 8. a linear guide rail;

4-1, an electric actuator; 4-2, a bracket; 4-3, a carrier plate; 4-4, a workpiece; 4-5, pressing the block; 4-6, a liftout cylinder; 4-7, a first magnetic induction switch; 4-8, a second magnetic induction switch; 4-9, a throttle valve b;

5-1, a bottom plate; 5-2, a guide wheel; 5-3, a motor; 5-4, a motor bracket; 5-5, synchronous belt; 5-6, synchronous pulley I; 5-7, a cylinder bracket; 5-8, jacking the cylinder; 5-9, a throttle valve a;5-10, pressing plate; 5-11, compressing springs; 5-12, a linear bearing; 5-13, a guide shaft; 5-14, a magnetic induction switch III; 5-15, a magnetic induction switch IV; 5-16, and a synchronous pulley II; 5-17, a pillar for a notch-type tension spring; 5-18, an extension spring; 5-19, a strut for a hole type tension spring; 5-20, tensioning the pull plate; 5-21, a tensioning wheel; 5-22, a bearing with a seat; 5-23, abrasive belt; 5-24, a driving wheel; 5-25, an adapter plate; 5-26, a centering plate;

7-1, a servo motor; 7-2, a servo motor bracket; 7-3, a first coupling; 7-4, fixing the bearing with the seat on the side; 7-5, connecting plates of belt sander; 7-6, a right-handed screw rod; 7-7, supporting the side bearing with the seat; 7-8, a second coupling; 7-9, a left-handed screw rod.

Detailed Description

The utility model will be further described with reference to the accompanying drawings in the present application, but it should not be construed that the scope of the utility model is limited to the embodiments described below. Various substitutions and alterations are made by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.

As shown in fig. 1-9, a symmetrical plane wire drawing device which is self-adjusting according to the size of a workpiece comprises a frame 1, a left distance sensor 2, a right distance sensor 3, a conveying device 4, a left belt sander 5, a right belt sander 6, a centering device 7 and a linear guide rail 8;

the middle position of the upper end surface of the frame 1 is provided with a conveying device 4, and the right side distance sensor 3 of the left side distance sensor 2 is respectively arranged at the front ends of two sides of the conveying device 4; the two sides of the wire drawing position of the conveying device 4 are respectively provided with a left abrasive belt machine 5 and a right abrasive belt machine 6; the left abrasive belt machine 5 and the right abrasive belt machine 6 are respectively connected with the frame 1 through linear guide rails 8; the machine frame 1 is rectangular, two symmetrical strip avoidance holes are formed in the center of the machine frame 1, and the centering device 7 is arranged at the bottom of the machine frame 1.

The left distance sensor 2, the right distance sensor 3, the left belt sander 5 and the right belt sander 6 are symmetrically arranged relative to the conveying device 4.

The left abrasive belt machine 5 and the right abrasive belt machine 6 are of symmetrical structures with the same structure, and comprise a bottom plate 5-1, a guide wheel 5-2, a motor 5-3, a synchronous pulley I5-6, a jacking cylinder 5-8, a jacking plate 5-10 linear bearing 5-12, a guide shaft 5-13, a synchronous pulley II 5-16, a notch type strut 5-17 for a tension spring, a tensioning pull plate 5-20, a tensioning wheel 5-21, a belt seat bearing 5-22, an abrasive belt 5-23, a driving wheel 5-24, an adapter plate 5-25 and a centering plate 5-26; the front end of the bottom plate 5-1 is provided with two bearing with seats 5-22, a guide wheel 5-2 is arranged in the bearing with seats 5-22, and the bottom of the guide wheel 5-2 is connected with the bearing with seats 5-22 through a snap spring for a shaft; an air cylinder bracket 5-7 is arranged between the two guide wheels 5-2 at the front end, the bottom of the air cylinder bracket 5-7 is connected with the bottom plate 5-1 through a screw, and a jacking air cylinder 5-8 is arranged on the air cylinder bracket 5-7; the upper end of the jacking cylinder 5-8 is provided with a magnetic induction switch III 5-14 and a magnetic induction switch IV 5-15, and the side wall of the jacking cylinder is provided with a throttle valve a5-9; the front end of the jacking cylinder 5-8 is provided with an adapter plate 5-25, the adapter plate 5-25 is provided with four linear bearings 5-12, a guide shaft 5-13 is inserted into the linear bearings 5-12, the rear end of the guide shaft 5-13 is provided with a spigot structure for limiting the guide shaft 5-13 to slide forwards, and the front end of the guide shaft 5-13 is of an external thread structure and is connected with a threaded hole at the back of the jacking plate 5-10; the guide shaft 5-13 between the top pressing plate 5-10 and the adapter plate 5-25 is provided with a compression spring 5-11, and constant pressure is provided for the front end of the top pressing plate 5-10 through the structure; the bottom of the tensioning wheel 5-21 is fixedly connected with the tensioning pulling plate 5-20 through two screws, a rotating shaft structure is processed on the other side of the tensioning pulling plate 5-20, and the tensioning pulling plate is connected with the bearing with a seat 5-22 through a shaft clamping spring; the side of the tensioning pulling plate 5-20 is provided with a hole type stretching spring strut 5-19, the notch type stretching spring strut 5-17 is arranged on the bottom plate 5-1, and a stretching spring 5-18 is arranged between the hole type stretching spring strut 5-19 and the notch type stretching spring strut 5-17; the bottom of the driving wheel 5-24 is provided with a synchronous pulley I5-6, the driving wheel 5-24 and the synchronous pulley I5-6 are fixedly connected through a set screw and a key, and a rotating shaft at the bottom of the driving wheel 5-24 is connected with a bearing 5-22 with a seat through a clamping spring for a shaft; a motor bracket 5-4 is arranged at one side of the driving wheel 5-24, the motor 5-3 is connected with the motor bracket 5-4 through a screw, a synchronous pulley II 5-16 is arranged at the front end of an output shaft of the motor 5-3, and the motor 5-3 and the synchronous pulley II 5-16 are fixedly connected through a set screw and a key; a synchronous belt 5-5 for transmitting power is arranged between the synchronous belt wheel II 5-16 and the synchronous belt wheel I5-6; the outer ring of the guide wheel 5-2, the driving wheel 5-24 and the tensioning wheel 5-21 is provided with an abrasive belt 5-23; the centering pressing plate 5-26 is arranged at the front end of the bottom plate 5-1.

When the output shaft of the motor 5-3 rotates, the driving shaft 5-24 is driven to rotate by the synchronous belt 5-5, so that the abrasive belt 5-23 is driven to move, and the tension spring 5-18 provides tension for the tensioning wheel 5-21, so that the abrasive belt is kept in a tensioning state.

The centering device 7 comprises a servo motor 7-1, a servo motor bracket 7-2, a first coupler 7-3, a fixed side belt seat bearing 7-4, a belt sander connecting plate 7-5, a right-handed screw rod 7-6, a supporting side belt seat bearing 7-7, a second coupler 7-8 and a left-handed screw rod 7-9; the servo motor 7-1 is arranged at the bottom of the frame 1 through a servo motor bracket 7-2; the first coupler 7-3 is connected with an output shaft of the servo motor, the right-handed screw rod 7-6 and the left-handed screw rod 7-9 are connected together through the second coupler 7-8, and the right-handed screw rod 7-6 and the left-handed screw rod 7-9 are supported by the fixed side bearing with seat 7-4 and the supporting side bearing with seat 7-7 and fixed on the frame 1; the left-handed screw rod 7-9 and the right-handed screw rod 7-6 are connected with a main shaft of the servo motor through a second coupler 7-8 and a first coupler 7-3; the nuts of the right-handed screw rod 7-6 and the left-handed screw rod 7-9 are connected with a belt sander connecting plate 7-5, and the belt sander connecting plate 7-5 penetrates through a strip mounting hole in the center of the frame 1 and is connected with the belt sander 5 of the left-handed belt sander 5 and the belt sander bottom plate 5-1 of the right-handed belt sander 6.

When the output shaft of the servo motor 7-1 rotates, the nuts of the right-handed screw rod 7-6 and the left-handed screw rod 7-9 move in opposite directions, and the two nuts are connected with the belt sander bottom plate 5-1 through the belt sander connecting plate 7-5, so that the centering action of the belt sander 5 on the left side and the belt sander 6 on the right side is realized; the conveying device 4 comprises an electric actuator 4-1, a bracket 4-2, a carrier plate 4-3, a pressing block 4-5, a material pushing cylinder 4-6, a magnetic induction switch I4-7, a magnetic induction switch II 4-8 and a throttle valve b4-9; the lower end face of the bracket 4-2 is connected with the frame 1 through a screw, and the upper end of the bracket 4-2 is provided with an electric actuator 4-1; the carrier plate 4-3 is of an L-shaped structure, the front end of the carrier plate is provided with a limiting step, and the carrier plate is connected with a sliding block of the electric actuator 4-1 through a screw; the end face of the carrier plate 4-3 is provided with a jacking cylinder 4-6, and the jacking cylinder 4-6 is provided with a first magnetic induction switch 4-7, a second magnetic induction switch 4-8 and a throttle valve b4-9; the front end of the jacking cylinder 4-6 is provided with a jacking block 4-5, and the workpiece 4-4 is placed on a carrier plate 4-3 at the front end of the jacking block 4-5.

The strip clearance hole in the center of the frame 1 is reserved with a movement space.

The centering plates 5-26 are L-shaped extending structures and are used for centering workpieces.

The tensioning wheels 5-21 are autorotation guide wheels.

The servo motor 7-1 is capable of registering the current position of each component in accordance with the controller.

The pressing blocks 4-5 are preferably processed by soft polyurethane, so that the workpiece is prevented from being damaged by pressing.

The working process of the symmetrical plane wire drawing device self-adjusting according to the size of a workpiece comprises the following steps: during operation, a workpiece 4-4 is placed on a carrier plate 4-3 of a conveying device 7, the front end of the workpiece 4-4 is aligned with the step position of an L-shaped structure of the carrier plate 4-3, equipment is started, a piston rod of a jacking cylinder 4-6 extends out to prop against the workpiece 4-4, and the distance between two pairs of surfaces to be processed of the workpiece 4-4 is calculated in a control system through feedback signals of a left-side distance sensor 2 and a right-side distance sensor 3, as shown in fig. 7 (initial station); the electric actuator 4-1 of the conveying device 7 drives the workpiece 4-4 to reach a centering station, the piston rod of the jacking cylinder 4-6 is retracted, the centering operation is carried out on the workpiece 4-4 by the centering plates 5-26 on the left abrasive belt machine 5 and the right abrasive belt machine 6 under the drive of the centering device 7 according to the distance between the two pairs of surfaces to be processed of the workpiece 4-4 calculated by the control system, as shown in fig. 8 (centering station), after the centering operation is completed, the piston rod of the jacking cylinder 4-6 stretches out again to prop against the workpiece 4-4, and the left abrasive belt machine 5 and the right abrasive belt machine 6 are far away from the workpiece 4-4 for a certain distance; the electric actuator 4-1 of the conveying device 7 drives the workpiece 4-4 to reach the wiredrawing station, the motors 5-3 on the left abrasive belt machine 5 and the right abrasive belt machine 6 are started to drive the abrasive belt 5-23 to start moving, the distance between two opposite sides of the workpiece 4-4 to be processed calculated according to the control system, the left abrasive belt machine 5 and the right abrasive belt machine 6 are driven by the centering device 7 to approach the workpiece 4-4, after reaching a specified distance, the piston rods of the jacking cylinders 5-8 on the left abrasive belt machine 5 and the right abrasive belt machine 6 extend out, the jacking plates 5-10 connected to the front ends of the jacking cylinders 5-8 enable the abrasive belt 5-23 to be in contact with the two opposite sides of the workpiece 4-4 to be processed, constant pressure is provided for the jacking plates 5-10 through the compression springs 5-11, the guide shafts 5-14 and the linear bearings 5-12, the piston rods are retracted after the jacking cylinders 5-8 are kept for a certain time according to the wire drawing effect requirement on the surface of the workpiece, the servo motor 7-1 of the centering device 7 is started to drive the left abrasive belt machine 5-8 to be far away from the workpiece 4-4, and the electric actuator 4-4 is driven by the jacking cylinders 4-4 to reach the initial workpiece 4-4 to finish the workpiece 4-taking-up, and the workpiece 4-down the workpiece is finished.

Claims (10)

1. A symmetry plane wire drawing device self-adjusting according to the size of a workpiece is characterized in that: the belt conveyor comprises a frame (1), a left distance sensor (2), a right distance sensor (3), a conveying device (4), a left belt sander (5), a right belt sander (6), a centering device (7) and a linear guide rail (8);

the conveying device (4) is arranged at the center of the upper end surface of the frame (1), and the right-side distance sensor (3) of the left-side distance sensor (2) is respectively arranged at the front ends of two sides of the conveying device (4);

the two sides of the wire drawing position of the conveying device (4) are respectively provided with a left abrasive belt machine (5) and a right abrasive belt machine (6);

the left abrasive belt machine (5) and the right abrasive belt machine (6) are respectively connected with the frame (1) through linear guide rails (8);

the machine frame (1) is rectangular, two symmetrical strip avoidance holes are formed in the center of the machine frame, and the centering device (7) is arranged at the bottom of the machine frame (1).

2. A symmetrical plane wire drawing device according to claim 1, characterized in that the left-hand distance sensor (2), the right-hand distance sensor (3), the left-hand belt sander (5) and the right-hand belt sander (6) are arranged symmetrically with respect to the conveyor (4).

3. The symmetrical plane wire drawing device self-adjusting according to the workpiece size as claimed in claim 1, wherein the left abrasive belt machine (5) and the right abrasive belt machine (6) are of symmetrical structures with the same structure, and comprise a bottom plate (5-1), a guide wheel (5-2), a motor (5-3), a synchronous pulley I (5-6), a jacking cylinder (5-8), a jacking plate (5-10) linear bearing (5-12), a guide shaft (5-13), a synchronous pulley II (5-16), a notch type strut (5-17) for an extension spring, a tensioning pulling plate (5-20), a tensioning wheel (5-21), a belt seat bearing (5-22), an abrasive belt (5-23), a driving wheel (5-24), an adapter plate (5-25) and a centering plate (5-26);

the front end of the bottom plate (5-1) is provided with two bearing seats (5-22), a guide wheel (5-2) is arranged in the bearing seats (5-22), and the bottom of the guide wheel (5-2) is connected with the bearing seats (5-22) through a snap spring for a shaft;

an air cylinder bracket (5-7) is arranged between the two guide wheels (5-2) at the front end, the bottom of the air cylinder bracket (5-7) is connected with the bottom plate (5-1) through a screw, and a jacking air cylinder (5-8) is arranged on the air cylinder bracket (5-7);

the upper end of the jacking cylinder (5-8) is provided with a magnetic induction switch III (5-14) and a magnetic induction switch IV (5-15), and the side wall of the jacking cylinder is provided with a throttle valve a (5-9);

an adapter plate (5-25) is arranged at the front end of the jacking cylinder (5-8),

four linear bearings (5-12) are arranged on the adapter plate (5-25), guide shafts (5-13) are inserted into the linear bearings (5-12), a spigot structure is processed at the rear end of each guide shaft (5-13) and used for limiting the guide shafts (5-13) to slide forwards, and the front ends of the guide shafts (5-13) are of external thread structures and are connected with threaded holes in the back of the pressing plate (5-10);

a compression spring (5-11) is arranged on a guide shaft (5-13) between the top pressing plate (5-10) and the adapter plate (5-25), and constant pressure is provided for the front end of the top pressing plate (5-10) through the structure;

the bottom of the tensioning wheel (5-21) is fixedly connected with the tensioning pulling plate (5-20) through two screws, a rotating shaft structure is processed on the other side of the tensioning pulling plate (5-20), and the tensioning pulling plate is connected with the bearing with the seat (5-22) through a clamping spring for a shaft;

the side of the tensioning pulling plate (5-20) is provided with a hole type support post (5-19) for the tension spring, the notch type support post (5-17) for the tension spring is arranged on the bottom plate (5-1), and the tension spring (5-18) is arranged between the hole type support post (5-19) for the tension spring and the notch type support post (5-17) for the tension spring;

the bottom of the driving wheel (5-24) is provided with a synchronous pulley I (5-6), the driving wheel (5-24) is fixedly connected with the synchronous pulley I (5-6) through a set screw and a key, and a rotating shaft at the bottom of the driving wheel (5-24) is connected with a bearing with a seat (5-22) through a shaft snap spring;

a motor bracket (5-4) is arranged at one side of the driving wheel (5-24), the motor (5-3) is connected with the motor bracket (5-4) through a screw, a synchronous pulley II (5-16) is arranged at the front end of an output shaft of the motor (5-3), and the motor (5-3) and the synchronous pulley II (5-16) are fixedly connected through a set screw and a key;

a synchronous belt (5-5) for transmitting power is arranged between the synchronous belt wheel II (5-16) and the synchronous belt wheel I (5-6);

the outer ring of the guide wheel (5-2), the driving wheel (5-24) and the tensioning wheel (5-21) is provided with an abrasive belt (5-23);

the centering pressing plate (5-26) is arranged at the front end of the bottom plate (5-1).

4. A symmetrical plane wire drawing device according to claim 3, characterized in that the centering device (7) comprises a servo motor (7-1), a servo motor bracket (7-2), a first coupling (7-3), a fixed side belt seat bearing (7-4), a belt sander connecting plate (7-5), a right-hand screw (7-6), a supporting side belt seat bearing (7-7), a second coupling (7-8) and a left-hand screw (7-9);

the servo motor (7-1) is arranged at the bottom of the frame (1) through a servo motor bracket (7-2);

the first coupler (7-3) is connected with an output shaft of the servo motor and the right-handed screw, the second coupler (7-8) is used for connecting the right-handed screw (7-6) and the left-handed screw (7-9) together, and the right-handed screw (7-6) and the left-handed screw (7-9) are supported by the fixed side bearing (7-4) and the support side bearing (7-7) and are fixed on the frame (1);

the left-handed screw rod (7-9) and the right-handed screw rod (7-6) are connected with a main shaft of the servo motor through a second coupler (7-8) and a first coupler (7-3);

and the nuts of the right-handed screw rod (7-6) and the left-handed screw rod (7-9) are connected with a belt sander connecting plate (7-5), and the belt sander connecting plate (7-5) passes through a strip mounting hole in the center of the frame (1) and is connected with the belt sander (5-1) of the left-side belt sander (5) and the belt sander bottom plate (5-1) of the right-side belt sander (6).

5. The symmetrical plane wire drawing device according to claim 1, wherein the conveying device (4) comprises an electric actuator (4-1), a bracket (4-2), a carrier plate (4-3), a pressing block (4-5), a material pushing cylinder (4-6), a magnetic induction switch I (4-7), a magnetic induction switch II (4-8) and a throttle valve b (4-9);

the lower end face of the bracket (4-2) is connected with the frame (1) through a screw, and an electric actuator (4-1) is arranged at the upper end of the bracket (4-2);

the support plate (4-3) is of an L-shaped structure, the front end of the support plate is provided with a limiting step, and the support plate is connected with a sliding block of the electric actuator (4-1) through a screw;

the end face of the carrier plate (4-3) is provided with a material ejection cylinder (4-6), and the material ejection cylinder (4-6) is provided with a magnetic induction switch I (4-7), a magnetic induction switch II (4-8) and a throttle valve b (4-9);

the front end of the jacking cylinder (4-6) is provided with a jacking block (4-5), and a workpiece (4-4) is placed on a carrier plate (4-3) at the front end of the jacking block (4-5).

6. A symmetrical plane drawing device according to claim 1, characterized in that the elongated clearance hole in the centre of the frame (1) is a reserved movement space.

7. A symmetrical plane drawing apparatus according to claim 3, wherein the centering plate (5-26) is of L-shaped protrusion for centering the workpiece.

8. A symmetrical plane drawing device according to claim 3, characterized in that the tensioning wheel (5-21) is a self-rotating guide wheel.

9. A symmetrical plane drawing device according to claim 4, characterized in that the servo motor (7-1) is capable of registering the current position of each component according to the controller.

10. The symmetrical plane wire drawing device self-adjusting according to the size of the workpiece according to claim 5, wherein the pressing block (4-5) is processed by soft polyurethane to avoid the workpiece from being damaged by pressing.