CN112828739B - An automatic polishing machine for special-shaped pipe fittings - Google Patents

Abstract

The invention discloses an automatic polishing machine for special-shaped pipes, and mainly relates to the technical field of machining. Comprises a workpiece processing platform and a polishing device; the workpiece processing platform comprises a fixed platform and a movable platform; the top of the moving platform is provided with a processing servo motor, a connecting disc and a rear seat, and the connecting disc is provided with a workpiece positioning seat; the polishing device comprises a translation mechanism, a sliding seat and a polishing belt device; the polishing belt device comprises a polishing servo motor, an elastic polishing belt, a driving belt wheel and a plurality of driven belt wheels, wherein the elastic polishing belt is driven to move by the rotation of the driving belt wheel and is in contact with the surface to be polished of the special pipe workpiece. The invention has the beneficial effects that: the full-automatic grinding and polishing machine can realize full-automatic grinding and polishing processing of the special-shaped pipe fittings, not only saves time, labor and labor, but also enables the grinding and polishing quality to be better under the full-automatic mechanical control, and greatly reduces the product reject ratio.

Description

An automatic polishing machine for special-shaped pipe fittings

technical field

The invention relates to the technical field of mechanical processing, in particular to an automatic polishing machine for special-shaped pipe fittings.

Background technique

As shown in Figures 5 and 6 of the accompanying drawings, the metal wiper pipe fitting is provided with end convex plates at both ends, the front section of the metal wiper pipe fitting is straight, and the rear section and the front section are outwardly inclined at an included angle of 2°. Before painting, the outer three sides of the metal wiper pipe fitting (outside the top surface, the outer side of the side, and the outer side of the bottom surface) need to be polished and polished. Since the entire pipe fitting is an irregular shaped pipe fitting, ordinary grinding and polishing equipment cannot realize its automatic processing. The method of Miqian is that the workers manually operate the control pipe to grind through the abrasive belt. The whole process is not only labor-intensive, time-consuming and labor-intensive, but also the quality of grinding and polishing is uneven, and the product failure rate is very high.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an automatic polishing machine for special-shaped pipe fittings, which can realize fully automatic grinding and polishing processing of special-shaped pipe fittings, which not only saves time, labor and labor, but also fully automatic mechanical control makes the grinding and polishing quality better and greatly reduces the Product failure rate.

The present invention is achieved by the following technical solutions in order to achieve the above object:

An automatic polishing machine for special-shaped pipe fittings, comprising a workpiece processing platform and a polishing device; the workpiece processing platform includes a fixed platform and a mobile platform, and a platform displacement adjustment mechanism for driving the displacement adjustment of the mobile platform is provided on the fixed platform; the mobile platform The top of the platform is provided with a machining servo motor, a connecting plate and a back seat. The machining servo motor drives the connecting plate to rotate according to the servo angle. The connecting plate is provided with a workpiece positioning seat. A connecting plate is rotatably connected to the back seat; the polishing device includes a translation mechanism, a sliding seat and a polishing belt device; the translation mechanism drives the translation of the sliding seat, the polishing belt device is arranged on the sliding seat, and the polishing belt device It includes a polishing servo motor, an elastic polishing belt, a driving pulley and a plurality of driven pulleys, the polishing servo motor drives the rotation of the driving pulley, and the elastic polishing belt is arranged on the driving pulley and the plurality of driven pulleys , the rotation of the driving pulley drives the movement of the elastic polishing belt, and the elastic polishing belt is in contact with the to-be-polished surface of the special-shaped pipe workpiece.

The connecting plate is detachably provided with a non-metallic positioning plate, the non-metallic positioning plate is provided with an electromagnet mechanism, the workpiece positioning seat is arranged on the non-metallic positioning plate, and the iron core of the electromagnet mechanism is two The ends correspond to the top and bottom ends of the workpiece positioning seat, respectively.

The driven pulley includes a rear pulley and two front pulleys; the front pulley at the upper end crosses the special-shaped pipe workpiece placed on the workpiece positioning seat, and is located on the upper side of the mobile platform and away from the rear pulley side. ; The front side pulley at the lower end does not pass over the special-shaped pipe workpiece placed on the workpiece positioning seat, and is located under the moving platform and close to the rear side pulley side.

The sliding seat is provided with a support column and a motor seat; the top of the support column is provided with a pulley adjustment cylinder, the end of the piston rod of the pulley adjustment cylinder is connected with an arc wheel frame, and the two front pulleys They are respectively arranged at both ends of the arc wheel frame. The top end of the arc wheel frame goes over the special-shaped pipe workpiece placed on the workpiece positioning seat, and is located on the upper side of the moving platform and away from the rear pulley; the bottom end of the arc wheel frame is not The special-shaped pipe workpiece which is placed on the workpiece positioning seat is located under the moving platform and close to the side of the rear pulley; the polishing servo motor is arranged on the motor seat.

The moving platform is provided with a first photoelectric switch. After the workpiece to be polished is placed horizontally on the workpiece positioning seat, the convex plate at the end of the workpiece to be polished blocks the light signal of the first photoelectric switch, thereby triggering the electromagnet mechanism to energize .

The moving platform is provided with a second photoelectric switch. After the polishing of the special-shaped pipe workpiece to be polished is completed and transferred to the side away from the polishing device, the convex plate at the end of the special-shaped pipe workpiece to be polished blocks the light signal of the second photoelectric switch, thereby triggering the electromagnet Organization is powered off.

The platform displacement adjustment mechanism includes a servo cylinder and a guide mechanism. The connecting block on the bottom surface of the mobile platform is connected with the piston rod of the servo cylinder. The guide mechanism includes a guide column and a guide seat, and the guide column is arranged on both sides of the fixed platform. The guide seats are arranged on both sides of the bottom surface of the mobile platform, and the guide columns are matched with the guide holes on the guide seat and can slide along the guide holes.

The translation mechanism includes a lead screw servo motor, a lead screw and a nut transmission mechanism, and a guide rail. The moving screw nut is arranged in the center of the bottom of the sliding seat, the guide sliding rails are arranged on both sides of the transmission screw, and the sliding blocks slidingly connected with the guiding sliding rails are arranged on both sides of the bottom of the sliding seat.

A stripper plate is provided on one side of the mobile platform.

The bottom of the fixed platform is supported by a support frame.

Compared with the prior art, the beneficial effects of the present invention are:

When in use, the special-shaped pipe to be polished is positioned and fixed on the workpiece positioning seat, and the processing servo motor drives the connecting plate to rotate according to the servo angle, thereby driving the outer three sides of the special-shaped pipe to be polished (outside of the top surface, outside of the side surface, and outside of the bottom surface) respectively and elastic polishing When polishing and grinding with contact, since the connecting plate drives the special-shaped pipe to be polished to rotate and adjust the position according to the servo angle, the movement of the special-shaped pipe to be polished will have a vertical displacement perpendicular to the direction of the moving platform (such as the position B in Figure 1 of the accompanying drawing of the manual). The direction of the arrow) is divided into movement and the lateral displacement in the direction parallel to the moving platform (such as the direction of the arrow at A in Figure 1 of the accompanying drawings) is divided into movement, "the front side pulley of the upper end passes over the special-shaped pipe workpiece placed on the workpiece positioning seat. , located on the upper side of the mobile platform and away from the rear side pulley; the front side pulley at the lower end does not cross the special-shaped pipe workpiece placed on the workpiece positioning seat, and is located under the mobile platform and close to the rear side pulley. The elastic deformation ability of the elastic polishing belt can ensure that the workpiece is always in contact with the elastic polishing belt if there is only a vertical displacement change; in order to keep the workpiece in contact with the elastic polishing belt when there is only a lateral displacement change , we designed a mobile platform, and the platform displacement adjustment mechanism can drive the horizontal and lateral movement of the mobile platform. As shown in Figure 1 of the accompanying drawings, when the connecting plate drives the special-shaped pipe to be polished according to the servo angle to rotate and adjust the position to cause horizontal displacement in the backward direction, in order to ensure that the contact between the workpiece and the elastic polishing belt is always maintained, the platform displacement adjustment mechanism It can drive the horizontal movement of the moving platform in the horizontal forward direction, thereby compensating for the horizontal displacement of the special-shaped pipe to be polished in the backward direction. Similarly, when the connecting plate drives the rotating and positioning of the special-shaped pipe to be polished according to the servo angle, the level in the forward direction appears. During sub-displacement, in order to ensure that the workpiece and the elastic polishing belt are always in contact, the platform displacement adjustment mechanism can drive the horizontal movement of the moving platform in the horizontal backward direction, thereby compensating for the horizontal sub-displacement of the special-shaped pipe to be polished in the forward direction. To sum up, the vertical displacement and lateral displacement of the special-shaped pipe to be polished can be solved and compensated structurally during the rotation adjustment process, so as to ensure that the workpiece is always in contact with the elastic polishing belt for grinding and polishing. The system controls the adjustment of the platform displacement adjustment mechanism, the drive of the processing servo motor to the connecting plate, and the drive of the translation mechanism to the polishing belt device. Fully automatic grinding and polishing processing not only saves time, labor and labor, but also fully automatic mechanical control makes the grinding and polishing quality better and greatly reduces the product failure rate.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a schematic view of the structure of the present invention.

Figure 3 is a schematic view of the structure of the present invention.

Figure 4 is a schematic structural diagram of the present invention.

Figure 5 is a schematic structural diagram of a special-shaped pipe fitting.

Figure 6 is a schematic structural diagram of a special-shaped pipe fitting.

Fig. 7 is a state diagram of grinding and polishing the outside of the top surface of the special-shaped pipe fitting.

Figure 8 is a view of the use state of grinding and polishing the outside of the side surface of the special-shaped pipe fitting.

Fig. 9 is a state diagram of grinding and polishing the outside of the bottom surface of the special-shaped pipe fitting.

Symbols shown in the attached drawings:

1. Fixed platform; 2. Mobile platform; 3. Processing servo motor; 4. Connecting plate; 5. Back seat; 6. Workpiece positioning seat; 7. Slide seat; 8. Polishing servo motor; 9. Elastic polishing belt; 10 , driving pulley; 11, non-metal positioning plate; 12, electromagnet mechanism; 13, rear pulley; 14, front pulley; 15, support column; 16, motor seat; 17, pulley adjustment cylinder; 18 , arc wheel frame; 19, first photoelectric switch; 20, second photoelectric switch; 21, servo cylinder; 22, connecting block; 23, guide column; 24, guide seat; 25, screw servo motor; 26, guide Slide rail; 27, drive screw; 28, driven screw nut; 29, stripper plate; 30, support frame; 31, material trolley.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the teaching content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

The invention is an automatic polishing machine for special-shaped pipe fittings, the main structure includes a workpiece processing platform and a polishing device; The fixed platform 1 is provided with a platform displacement adjustment mechanism for driving the displacement adjustment of the mobile platform 2; Piston rod connection, the guide mechanism includes a guide column 23 and a guide seat 24, the guide column 23 is arranged on both sides of the fixed platform 1, the guide seat 24 is arranged on both sides of the bottom surface of the mobile platform 2, the guide column 23 and The guide holes on the guide base 24 are matched and can slide along the guide holes. The servo cylinder 21 drives the connecting block 22 on the bottom surface of the mobile platform 2 to move by controlling the expansion and contraction of the piston rod, thereby realizing the horizontal and lateral displacement of the mobile platform 2 . The guide hole on the guide seat 24 is slidably connected with the guide column 23 to play a guiding role during horizontal lateral displacement, thereby ensuring the lateral displacement accuracy.

The top of the mobile platform 2 is provided with a processing servo motor 3, a connecting plate 4 and a back seat 5. The processing servo motor 3 drives the connecting plate 4 to rotate according to the servo angle, and the rotation of the connecting plate 4 is not a circle-by-circle rotation, but It only rotates a certain angle during the polishing process, and rotates alternately clockwise and counterclockwise, so as to drive the outer three sides of the special-shaped pipe to be polished (the outer side of the top surface, the outer side of the side surface, the outer side of the bottom surface) and the elastic polishing. Belt 9 contacts for polishing.

The connecting plate 4 is detachably provided with a non-metallic positioning plate 11 through a bolt and nut assembly. The non-metallic positioning plate 11 is provided with an electromagnet mechanism 12. The reason why the non-metallic positioning plate 11 is provided is to reduce weight. , and the second is because the electromagnet mechanism 12 has an iron core, which will generate a greater magnetic force. The workpiece positioning seat 6 is arranged on the non-metal positioning plate 11, the iron core of the electromagnet mechanism 12 is arranged in the workpiece positioning seat 6, and the two ends of the iron core correspond to the top and bottom ends of the workpiece positioning seat 6 respectively, so that the The top and bottom ends of the workpiece positioning seat 6 have magnetism, so that the end convex plate of the metal wiper pipe fitting is adsorbed and fixed by magnetic force.

One of the connecting plates 4 is drivingly connected with the processing servo motor 3, and the other connecting plate 4 is rotatably connected with the rear seat 5; the polishing device includes a translation mechanism, a sliding seat 7 and a polishing belt device; the translation mechanism drives the sliding seat 7 Translation, the polishing belt device is arranged on the sliding seat 7 . The translation mechanism includes a lead screw servo motor 25, a lead screw and nut transmission mechanism, and a guide rail 26. The lead screw servo motor 25 drives the transmission screw 27 of the lead screw and nut transmission mechanism to rotate. The driven screw nut 28 of the transmission mechanism is arranged in the bottom center of the sliding seat 7, and the screw servo motor 25 drives the driven screw nut 28 to move along the driving screw 27 by driving the rotation of the driving screw 27, thereby driving the driving screw 27 to move. As the sliding seat 7 moves along the drive screw 27, the polishing belt device on the sliding seat 7 also moves along with it. The guide rails 26 are disposed on both sides of the drive screw 27 , and slide blocks slidably connected to the guide rails 26 are provided on both sides of the bottom of the sliding seat 7 . The sliding connection between the guide rail 26 and the slider plays a limiting role.

The polishing belt device includes a polishing servo motor 8 , an elastic polishing belt 9 , a driving pulley 10 and three driven pulleys. The three driven pulleys include a rear pulley 13 and two front pulleys 14 . The sliding seat 7 is provided with a support column 15 and a motor seat 16; the top of the support column 15 is provided with a pulley adjustment cylinder 17, and the end of the piston rod of the pulley adjustment cylinder 17 is connected with an arc wheel frame 18. The front pulleys 14 are respectively arranged at both ends of the arc wheel frame 18, and the lateral displacement of the two front pulleys 14 is realized by controlling the expansion and contraction of the piston rod of the pulley adjusting cylinder 17, so that the elastic polishing belt 9 Hold tight for later grinding and polishing. Moreover, the extension length of the piston rod of the pulley adjustment cylinder 17 can also be adjusted according to the width of the special-shaped workpiece in the lateral direction, because the width of the special-shaped workpiece of different types in the lateral direction is different, which requires the adjustment of the pulley. The extension length of the piston rod of the cylinder 17 is adjusted, thereby realizing the lateral adjustment of the two front pulleys 14 to meet the processing requirements of different types of special-shaped workpieces. In addition, the reason why the pulley adjusting cylinder 17 is provided is for the convenience of loading and unloading. When a special-shaped workpiece is processed and unloaded, the piston rod of the pulley adjusting cylinder 17 needs to be retracted, so that the two front pulleys 14 are moved away from each other. The workpiece processing platform moves in the direction, and at the same time, the moving platform 2 returns to the origin on the side away from the polishing device under the control of the platform displacement adjustment mechanism, so that the polished special-shaped workpiece will no longer be in contact with the elastic polishing belt 9, and There is no interference with the position of the elastic polishing belt 9 .

In order to realize the three-sided grinding and polishing of the special-shaped workpiece, during the grinding and polishing process, it is necessary to keep the top front side pulley 14 of the arc-shaped wheel frame 18 over the special-shaped pipe workpiece placed on the workpiece positioning seat 6, on the mobile platform 2 and away from it. The rear side pulley 13 side; the front side pulley 14 of the bottom end of the arc wheel frame 18 does not cross the special-shaped pipe workpiece placed on the workpiece positioning seat 6, and is located under the mobile platform 2 and is close to the rear side pulley 13 side; The polishing servo motor 8 is arranged on the motor base 16 . The polishing servo motor 8 drives the rotation of the driving pulley 10, and the rotation of the driving pulley 10 drives the movement of the elastic polishing belt 9. Only the two front side pulleys 14 set in this state can maintain the elastic polishing belt 9 and the special-shaped pipe workpiece. The three surfaces to be polished are always in grinding and polishing contact during processing.

In order to realize the automatic positioning and fixing of the special-shaped workpiece to be polished, a first photoelectric switch 19 is provided on the mobile platform 2, and the setting position of the first photoelectric switch 19 is: when the workpiece to be polished is horizontally placed on the workpiece positioning seat 6 , the end of the end convex plate of the special-shaped tube workpiece to be polished blocks the light signal of the first photoelectric switch 19 , thereby triggering the electromagnet mechanism 12 to energize. When the workpiece of the special-shaped pipe to be polished is not placed, the workpiece positioning seat 6 will not block the light signal of the first photoelectric switch 19 . In this way, when the ends of the end protruding plates at both ends of the special-shaped pipe workpiece to be polished completely block the optical signal of the first photoelectric switch 19, the electromagnet mechanism 12 can be energized, so that the iron core of the electromagnet mechanism 12 has both ends. Magnetic, so that the workpiece to be polished special-shaped pipe is positioned and fixed by magnetic adsorption.

In order to facilitate the automatic unloading of the polished special-shaped pipe workpiece, the mobile platform 2 is provided with a second photoelectric switch 20, and the setting position of the second photoelectric switch 20 is: after the polishing of the special-shaped pipe workpiece to be polished is completed, it is processed by the servo motor. 3. After the workpiece is rotated and transferred to the side away from the polishing device, when the ends of the end convex plates at both ends of the polished special-shaped pipe workpiece completely block the optical signal of the second photoelectric switch 20, the electromagnet mechanism 12 is triggered to power off. Continue to rotate and run, so that the polished special-shaped pipe workpiece automatically slides off when the polished special-shaped pipe workpiece is tilted downward below the level. The device is provided with a stripper plate 29 on one side of the moving platform 2 . The polished special-shaped pipe workpiece automatically slides down onto the unloading plate 29, and then slides down from the unloading plate 29 to the trolley 31 on the ground.

Detailed explanation of usage:

When in use, firstly, the special-shaped pipe to be polished is positioned and fixed on the workpiece positioning seat 6 . The method is as follows: the special-shaped pipe to be polished is placed on the workpiece positioning seat 6 on the non-metal positioning plate 11, and the end of the end convex plate of the workpiece to be polished is blocked from the light signal of the first photoelectric switch 19, thereby triggering the electromagnet mechanism 12 to energize. Therefore, both ends of the iron core of the electromagnet mechanism 12 are magnetic, so that the workpiece of the special-shaped pipe to be polished can be positioned and fixed by magnetic adsorption.

Then, adjust the positions of the two front pulleys 14, and adjust the position of the moving platform 2 in the direction close to the polishing device, so as to ensure that the elastic polishing belt 9 has better polishing and polishing contact with the special-shaped pipe to be polished. Location. The method is as follows: by controlling the expansion and contraction of the piston rod of the pulley adjusting cylinder 17, the lateral displacement of the two front pulleys 14 is realized, so as to tighten the elastic polishing belt 9 and move a short distance to the side close to the workpiece processing platform. The connecting block 22 on the bottom surface of the mobile platform 2 is driven to move by the servo cylinder 21 by controlling the expansion and contraction of the piston rod, thereby realizing the horizontal and lateral displacement of the mobile platform 2 .

Then, the servo motor 3 is processed and the connecting plate 4 is driven to rotate according to the servo angle, thereby driving the three outer sides (outside of the top surface, outside of the side surface, and outside of the bottom surface) of the special-shaped pipe to be polished to contact the elastic polishing belt 9 respectively for polishing and polishing. When the special-shaped pipe to be polished is driven to rotate and adjust the position according to the servo angle, the movement of the special-shaped pipe to be polished will have a vertical displacement in the direction perpendicular to the moving platform 2 (such as the direction of the arrow at B in Figure 1 of the accompanying drawings) divided into movement and parallel. The lateral displacement in the direction of the moving platform 2 (such as the direction of the arrow at A in Figure 1 of the accompanying drawings) is divided into motion, "the front pulley 14 at the upper end crosses the special-shaped pipe workpiece placed on the workpiece positioning seat 6, and is located in the moving platform 2. The upper side is away from the side of the rear side pulley 13; the front side pulley 14 at the lower end does not cross the special-shaped pipe workpiece placed on the workpiece positioning seat 6, and is located under the mobile platform 2 and is close to the rear side pulley 13. This structure is provided With the elastic deformation ability of the elastic polishing belt 9, it can be well ensured that the workpiece and the elastic polishing belt 9 are always kept in contact if there is only a vertical displacement change; With the contact of 9, we designed the mobile platform 2, and the platform displacement adjustment mechanism can drive the horizontal and lateral movement of the mobile platform 2. As shown in FIG. 1 of the accompanying drawings, when the connecting plate 4 drives the special-shaped pipe to be polished according to the servo angle to rotate and adjust the position to cause a horizontal displacement in the backward direction, in order to ensure that the workpiece and the elastic polishing belt 9 are always kept in contact, the platform is displaced. The adjustment mechanism can drive the horizontal movement of the moving platform 2 in the horizontal forward direction, thereby compensating for the horizontal displacement of the special-shaped pipe to be polished in the backward direction. Similarly, when the connecting plate 4 drives the special-shaped pipe to be polished according to the servo angle, it rotates and adjusts its position. In order to keep the workpiece in contact with the elastic polishing belt 9, the platform displacement adjustment mechanism can drive the horizontal movement of the moving platform 2 in the horizontal backward direction, so as to compensate the horizontal separation of the special-shaped pipe to be polished in the forward direction. displacement. To sum up, the vertical displacement and lateral displacement of the special-shaped pipe to be polished can be solved and compensated structurally during the rotation adjustment process, so as to ensure that the workpiece is always in contact with the elastic polishing belt 9 for grinding and polishing. . During the grinding process, the screw servo motor 25 controls the translation of the entire polishing belt device along the direction of the driving screw 27 through the screw and nut transmission mechanism, so as to gradually grind and polish the special-shaped pipe to be polished. That is, through the adjustment of the displacement adjustment mechanism of the system control platform, the drive of the processing servo motor 3 to the connecting plate 4, and the drive of the translation mechanism to the polishing belt device, the three-sided automatic polishing work of the special-shaped pipe fittings is realized, and the special-shaped pipe fittings are truly realized. Fully automatic grinding and polishing of pipe fittings,

After the three-sided grinding and polishing of the special-shaped pipe fitting is completed, the piston rod of the pulley adjustment cylinder 17 needs to be retracted, so as to move the two front pulleys 14 away from the workpiece processing platform, and the mobile platform 2 is also under the control of the platform displacement adjustment mechanism. Return to the origin to the side away from the polishing device, so that the polished special-shaped pipe will no longer be in contact with the elastic polishing belt 9, and will not interfere with the position of the elastic polishing belt 9, and enough space is reserved. . Then, after the workpiece is transferred to the side away from the polishing device by the rotation of the machining servo motor 3, the ends of the end convex plates at both ends of the polished special-shaped pipe workpiece completely block the optical signal of the second photoelectric switch 20, thereby triggering the electromagnet mechanism 12 to power off. Continue to rotate and run, so that the polished special-shaped pipe workpiece automatically slides off when the polished special-shaped pipe workpiece is tilted downward below the level. The device is provided with a stripper plate 29 on one side of the moving platform 2 . The polished special-shaped pipe workpiece automatically slides down onto the unloading plate 29, and then slides down from the unloading plate 29 to the trolley 31 on the ground.

To sum up, the three-sided grinding and polishing processing of special-shaped pipe fittings by the above method not only saves time, labor and labor, but also fully automatic mechanical control makes the grinding and polishing quality better, and greatly reduces the product failure rate.

Claims (8)

1. An automatic polishing machine for special-shaped pipe fittings, characterized in that: it comprises a workpiece processing platform and a polishing device; the workpiece processing platform comprises a fixed platform (1) and a mobile platform (2), and the fixed platform (1) is provided with a A platform displacement adjustment mechanism for driving the displacement adjustment of the mobile platform (2); The top of the mobile platform (2) is provided with a machining servo motor (3), a connecting plate (4) and a rear seat (5). The machining servo motor (3) drives the connecting plate (4) to rotate according to the servo angle, and the The connecting plate (4) is provided with a workpiece positioning seat (6), one of the connecting plates (4) is drivingly connected with the machining servo motor (3), and the other connecting plate (4) is rotatably connected with the rear seat (5); The polishing device includes a translation mechanism, a sliding seat (7) and a polishing belt device; the translation mechanism drives the translation of the sliding seat (7), the polishing belt device is arranged on the sliding seat (7), and the polishing belt device It includes a polishing servo motor (8), an elastic polishing belt (9), a driving pulley (10) and a plurality of driven pulleys, the polishing servo motor (8) drives the rotation of the driving pulley (10), and the elastic The polishing belt (9) is arranged on the driving pulley (10) and the plurality of driven pulleys, the rotation of the driving pulley (10) drives the movement of the elastic polishing belt (9), and the elastic polishing belt (9) is different from the special-shaped polishing belt (9). The contact of the surface to be polished of the pipe workpiece; The driven pulley includes a rear pulley (13) and two front pulleys (14); the front pulley (14) at the upper end passes over the special-shaped pipe workpiece placed on the workpiece positioning seat (6), Located on the upper side of the moving platform (2) and away from the side of the rear pulley (13); the front pulley (14) at the lower end does not pass over the special-shaped pipe workpiece placed on the workpiece positioning seat (6), and is located on the moving platform (2) Bottom and close to the side of the rear pulley (13); The platform displacement adjustment mechanism can drive the horizontal and lateral movement of the mobile platform (2); when the connecting plate (4) drives the special-shaped pipe to be polished to rotate and adjust the position to cause horizontal sub-displacement in the backward direction, the platform displacement adjustment mechanism drives the mobile platform (2). ) horizontally in the forward direction, so as to compensate the horizontal displacement of the special-shaped pipe to be polished in the backward direction, so as to ensure that the contact between the special-shaped pipe to be polished and the elastic polishing belt (9) is always maintained; when the connecting plate (4) drives the polishing When there is a horizontal displacement in the forward direction when the special-shaped pipe is rotated and adjusted, the platform displacement adjustment mechanism drives the horizontal movement of the moving platform (2) in the horizontal and backward direction, so as to compensate the horizontal displacement of the special-shaped pipe to be polished in the forward direction and ensure that the Contact between the special-shaped pipe to be polished and the elastic polishing belt (9); The platform displacement adjustment mechanism includes a servo cylinder (21) and a guide mechanism, a connecting block (22) on the bottom surface of the mobile platform (2) is connected with a piston rod of the servo cylinder (21), and the guide mechanism includes a guide column (23) ) and a guide seat (24), the guide column (23) is arranged on both sides of the fixed platform (1), the guide seat (24) is arranged on both sides of the bottom surface of the mobile platform (2), the guide column (23) It is matched with the guide hole on the guide seat (24), and can slide along the guide hole. 2. An automatic polishing machine for special-shaped pipe fittings according to claim 1, characterized in that: a non-metallic positioning plate (11) is detachably provided on the connecting plate (4), and the non-metallic positioning plate (11) is a An electromagnet mechanism (12) is provided thereon, the workpiece positioning seat (6) is arranged on a non-metal positioning plate (11), and both ends of the iron core of the electromagnet mechanism (12) correspond to the workpiece positioning seat (6) respectively the top and bottom ends. 3. The automatic polishing machine for special-shaped pipe fittings according to claim 1, characterized in that: the sliding seat (7) is provided with a support column (15) and a motor seat (16); the top of the support column (15) is provided A pulley adjustment cylinder (17) is provided, the end of the piston rod of the pulley adjustment cylinder (17) is connected with an arc wheel frame (18), and the two front pulleys (14) are respectively arranged on the arc wheel At both ends of the frame (18), the top end of the arc wheel frame (18) crosses the special-shaped pipe workpiece placed on the workpiece positioning seat (6), and is located on the upper side of the moving platform (2) and away from the rear side pulley (13) side ; The bottom end of the arc wheel frame (18) does not go over the special-shaped pipe workpiece placed on the workpiece positioning seat (6), and is located under the moving platform (2) and close to the side of the rear pulley (13); The polishing servo motor (8) is arranged on the motor base (16). 4. An automatic polishing machine for special-shaped pipe fittings according to claim 3, characterized in that: the moving platform (2) is provided with a first photoelectric switch (19), and the workpiece of the special-shaped pipe to be polished is horizontally placed on the workpiece positioning seat ( 6) After being installed, the convex plate at the end of the special-shaped tube workpiece to be polished blocks the light signal of the first photoelectric switch (19), thereby triggering the electromagnet mechanism (12) to energize. 5. The automatic polishing machine for special-shaped pipe fittings according to claim 4, characterized in that: the moving platform (2) is provided with a second photoelectric switch (20), and the workpiece to be polished is transferred to the polishing device away from the polishing device. After one side, the convex plate at the end of the special-shaped tube workpiece to be polished blocks the light signal of the second photoelectric switch (20), thereby triggering the electromagnet mechanism (12) to power off. 6. The automatic polishing machine for special-shaped pipe fittings according to claim 1, characterized in that: the translation mechanism comprises a screw servo motor (25), a screw-nut transmission mechanism, a guide rail (26), and the screw The rod servo motor (25) drives the drive screw (27) of the screw-and-nut transmission mechanism to rotate, and the driven screw (28) of the screw-and-nut transmission mechanism is arranged in the bottom center of the sliding seat (7), so The guide rails (26) are arranged on both sides of the drive screw (27), and slide blocks slidably connected to the guide rails (26) are provided on both sides of the bottom of the sliding seat (7). 7 . The automatic polishing machine for special-shaped pipe fittings according to claim 1 , wherein a discharge plate ( 29 ) is provided on one side of the moving platform ( 2 ). 8 . 8 . The automatic polishing machine for special-shaped pipe fittings according to claim 1 , wherein the bottom of the fixed platform ( 1 ) is supported by a support frame ( 30 ). 9 .

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