CN115042041A

CN115042041A - Precision pipeline polishing equipment

Info

Publication number: CN115042041A
Application number: CN202210987795.4A
Authority: CN
Inventors: 赵雪兴
Original assignee: Hecheng Precision Tube Industry Nantong Co ltd
Current assignee: Hecheng Precision Tube Industry Nantong Co ltd
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2022-09-13
Anticipated expiration: 2042-08-17
Also published as: CN115042041B

Abstract

The invention discloses precision pipeline polishing equipment which comprises a base, wherein a rotating seat is fixedly connected to the top wall of the base, a vertical plate is connected to the inner wall of the rotating seat in a sliding mode, the vertical plate is of a circular ring structure, a rectangular block is fixedly connected to the top wall of the base, a sliding groove is formed in the inner wall of the rectangular block, the inner wall of the sliding groove is elastically connected with an adjusting block through a conductive spring, a box body is fixedly connected to the inner wall of the adjusting block, a bottom plate is fixedly connected to the inner wall of the box body, a guide groove is formed in the inner wall of the bottom plate, a sliding column is connected to the inner wall of the guide groove in a sliding mode, a first rod is installed on the side wall of the sliding column, and a polishing machine is fixedly connected to one end of the first rod. According to the invention, by arranging the universal coupling, the reciprocating screw rod, the sliding block and other structures, in the sliding process of the sliding block, the polishing roller part of the polishing machine always slides along the side wall of the precision pipeline after pipe expansion, and the side wall of the precision pipeline after pipe expansion is polished and deburred.

Description

Precision pipeline polishing equipment

Technical Field

The invention relates to the technical field of precision pipeline polishing equipment, in particular to precision pipeline polishing equipment.

Background

The precise stainless steel pipe is a seamless steel pipe with high precision and high brightness produced by a cold drawing or cold rolling process, is safe, reliable, sanitary, environment-friendly, economical and applicable, has the advantages of being incapable of replacing other pipes due to the thin wall of the pipeline and the successful development of a novel, reliable, simple and convenient connection method, and is more and more applied in engineering, more and more popularized in use and good in prospect.

In the process of producing and processing the precise stainless steel pipeline, the precise stainless steel pipeline is often required to be subjected to pipe expanding processing, wherein the pipe expanding is to process one end of a thin pipe into a thick pipe so that the pipe diameter of one end of the pipeline is larger. When the precision pipelines subjected to pipe expanding processing are ground and polished, the existing grinding equipment can only well grind two sections of horizontal pipe body parts, and the joints of two ends with different pipe diameters are inconvenient to grind due to the inclined state, so that the grinding efficiency is low, and the labor intensity is increased.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides precision pipeline grinding equipment.

In order to achieve the purpose, the invention adopts the following technical scheme:

an accurate pipeline polishing device comprises a base and an accurate pipeline after pipe expansion, wherein a rotating seat is fixedly connected with the top wall of the base, a vertical plate is connected with the inner wall of the rotating seat in a sliding manner, the vertical plate is of a circular ring structure, a rectangular block is fixedly connected with the top wall of the base, a sliding groove is formed in the inner wall of the rectangular block, the inner wall of the sliding groove is elastically connected with an adjusting block through a conductive spring, a box body is fixedly connected with the inner wall of the adjusting block, a bottom plate is fixedly connected with the inner wall of the box body, a guide groove is formed in the inner wall of the bottom plate, a sliding column is slidably connected with the inner wall of the guide groove, a first rod is installed on the side wall of the sliding column, a polishing machine is fixedly connected with one end of the first rod, a folding rod is fixedly connected with the inner wall of the first rod, a second rod is fixedly connected with the other end of the folding rod, a polishing rod is fixedly connected with the side wall of the second rod, and a reciprocating lead screw is rotatably connected with the inner wall of the box body, reciprocating screw lateral wall threaded connection has the nut, nut inner wall fixedly connected with slider, slider inner wall symmetry is rotated and is connected with the bull stick, two the other end of bull stick rotates with first pole inner wall respectively and is connected, base inner wall fixedly connected with motor, the output fixedly connected with pivot of motor, the other end of pivot passes through universal joint and reciprocating screw connection, pivot lateral wall fixedly connected with carries out spacing fixture to the precision pipeline after the expander.

Further, fixture includes the first gear of fixed connection at the pivot lateral wall, riser lateral wall sliding connection has the ring board, ring board lateral wall fixedly connected with annular rack, first gear and annular rack meshing are connected, a plurality of recesses, every have been seted up to riser inner wall equipartition the inside equal sliding connection of recess has L shape pole, the one end of L shape pole all is equipped with the grip block, every a plurality of arc holes, every are all seted up to ring board inner wall L shape pole all runs through sliding connection inside an arc hole that corresponds.

Further, fixture still includes that the equipartition sets up a plurality of arcs at the riser inner wall, every the arc inner wall all inlays and is equipped with the electro-magnet, a plurality of bar magnets of ring plate inner wall equipartition fixedly connected with, every the equal sliding connection of bar magnet is inside an arc that corresponds, L shape pole lateral wall fixedly connected with conducting strip, arc hole inner wall fixedly connected with busbar.

Furthermore, the jack has been seted up to the one end of L shape pole, the jack inner wall has the support column through extension spring elastic connection, the one end and the grip block fixed connection of jack are kept away from to the support column.

Furthermore, the electromagnet is electrically connected with the conducting strip and the conducting strip, and the supporting column is connected inside the jack in a sliding mode.

Furthermore, the inner wall of the base is fixedly connected with a top block, the inner wall of the top block is connected with a third rod in a penetrating and rotating mode, the side wall of the third rod is fixedly connected with a second gear, the second gear is connected with the annular rack in a meshing mode, and one end of the third rod is fixedly connected with a U-shaped rod.

Furthermore, the inner wall of the base is symmetrically and fixedly connected with rectangular boxes, each rectangular box is internally and hermetically connected with a piston in a sliding manner, the inner wall of each piston is rotatably connected with a push rod, and one end, far away from the piston, of each push rod is rotatably connected with the bending part of the U-shaped rod.

Further, first pole lateral wall fixedly connected with suction hood, a plurality of dust absorption holes have been seted up to the suction hood inner wall, rectangle box inner wall runs through one-way intake pipe of fixedly connected with and one-way outlet duct, the other end and the fixed intercommunication in a plurality of dust absorption holes of one-way intake pipe.

The invention has the following advantages:

1. through the arrangement of the first gear, the circular ring plate, the magnetic bar and other structures, the plurality of L-shaped rods drive the clamping plate to slide for a certain distance, and the clamping plate clamps and fixes the side wall of the precision pipeline after pipe expansion;

2. when the conducting strips on the side wall of the L-shaped rod are abutted to the conducting strips, the electromagnet is electrified, and the electromagnet is electrified to perform magnetic attraction fixation on the magnetic rod, so that the circular ring plate and the vertical plate drive the precision pipeline after pipe expansion to rotate, and the side wall of the precision pipeline is conveniently subjected to rotary polishing processing;

3. through the arrangement of the universal coupling, the reciprocating screw rod, the sliding block and other structures, in the sliding process of the sliding block, the polishing roller part of the polishing machine always slides along the side wall of the expanded precise pipeline, and the side wall of the expanded precise pipeline is polished and deburred;

4. when the precision pipelines after pipe expansion with different pipe diameters are polished, currents with different sizes can be introduced into the conductive spring, the conductive spring drives the adjusting block and the box body to move for a distance after being electrified, so that the box body drives the polisher to move for a distance through the sliding block, the rotating rod and the first rod, the precision pipelines after pipe expansion with different pipe diameters can be polished, and the application range of the device is enlarged;

5. the ring gear drives the third rod and the U-shaped rod to rotate through the second gear, so that each push rod drives a corresponding piston to slide in the rectangular box in a reciprocating and sealing manner, dust generated by polishing is continuously sucked into the rectangular box from the dust suction holes, and the dust in the rectangular box is extruded into an external environment-friendly bag to be purified and collected.

Drawings

FIG. 1 is a schematic structural diagram of a precision pipe polishing apparatus according to the present invention;

FIG. 2 is a schematic structural view of a swivel base, a circular ring plate, a vertical plate and other structures in the precision pipeline polishing apparatus according to the present invention;

FIG. 3 is a schematic structural view of the interior of an arc-shaped groove in a precision pipeline polishing device according to the present invention;

fig. 4 is a schematic structural diagram of the inside of a rectangular box in the precision pipe polishing device according to the present invention.

In the figure: 1 base, 2 vertical plates, 3 annular racks, 4 motors, 5 second gears, 6 third rods, 7 first gears, 8 reciprocating lead screws, 9 box bodies, 10 bottom plates, 11 nuts, 12 sliding blocks, 13 rotating rods, 14 guide grooves, 15 sliding columns, 16 first rods, 17 grinding machines, 18 rectangular blocks, 19 conductive springs, 20 folding rods, 21 second rods, 22 grinding rods, 23 universal couplings, 24U-shaped rods, 25 push rods, 26 rectangular boxes, 27 pistons, 28 precision pipelines after pipe expansion, 29 sliding grooves, 30 dust hoods, 31 dust suction holes, 32 circular plates, 33 grooves, 34L-shaped rods, 35 extension springs, 36 supporting columns, 37 clamping plates, 38 arc grooves, 39 magnetic rods, 40 electromagnets, 41 arc holes,

conductive strips

42, 43 rotating seats and 44 adjusting blocks.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

Referring to fig. 1-4, a precision pipeline polishing device comprises a base 1 and a precision pipeline 28 after pipe expansion, wherein the top wall of the base 1 is fixedly connected with a rotary seat 43, the inner wall of the rotary seat 43 is slidably connected with a vertical plate 2, the top wall of the rotary seat 43 is provided with a semicircular groove, the vertical plate 2 slides in the semicircular groove, the vertical plate 2 is of a circular ring structure, the inner wall of the vertical plate 2 is provided with a storage hole, one end of the precision pipeline 28 after pipe expansion penetrates through and is fixedly connected in the storage hole, the top wall of the base 1 is fixedly connected with a rectangular block 18, the inner wall of the rectangular block 18 is provided with a sliding groove 29, the inner wall of the sliding groove 29 is elastically connected with an adjusting block 44 through a conductive spring 19, the conductive spring 19 is electrified and contracted because of non-contact or insulation between single turns of the spring, the spring is equivalent to an electrified solenoid when electrified, each turn of the spring is equivalent to annular current, and the current direction in each turn of the spring is the same. According to the mutual attraction between the currents in the same direction, each circle of spring is mutually attracted with the adjacent spring, and then the whole spring contracts. The adjusting block 44 slides in the sliding groove 29, the inner wall of the adjusting block 44 is fixedly connected with the box body 9, the inner wall of the box body 9 is fixedly connected with the bottom plate 10, the inner wall of the bottom plate 10 is provided with a guide groove 14, the guide groove 14 consists of a straight groove at two ends and a section of inclined groove, the projection profiles of the guide groove 14 and one side of the precision pipeline 28 after pipe expansion are consistent, the inner wall of the guide groove 14 is slidably connected with a sliding column 15, the side wall of the sliding column 15 is fixedly connected with a first rod 16, one end of the first rod 16 is fixedly connected with a grinding machine 17, the grinding machine 17 consists of a driving motor and a grinding roller, for the prior art, no repeated description is given here, the inner wall of the first rod 16 is fixedly connected with a folding rod 20, the other end of the folding rod 20 is fixedly connected with a second rod 21, the second rod 21 is inserted in the precision pipeline 28 after pipe expansion, the side wall of the second rod 21 is fixedly connected with a grinding rod 22, and the grinding rod 22 and the inner side wall of the precision pipeline 28 after pipe expansion are abutted and contacted for grinding, the inner wall of the box body 9 is connected with a reciprocating screw 8 in a penetrating and rotating way, the side wall of the reciprocating screw 8 is connected with a nut 11 in a threaded way, the inner wall of the nut 11 is abutted against the inner wall of the box body 9, the nut 11 can not generate autorotation, the inner wall of the nut 11 is fixedly connected with a slide block 12, the nut 11 drives the slide block 12 to move synchronously, the inner wall of the slide block 12 is symmetrically and rotatably connected with rotating rods 13, the other ends of the two rotating rods 13 are respectively and rotatably connected with the inner wall of a first rod 16, the inner wall of the base 1 is fixedly connected with a motor 4, the output end of the motor 4 is fixedly connected with a rotating shaft, the other end of the rotating shaft is connected with the reciprocating screw 8 through a universal coupling 23, the rotating shaft and the reciprocating screw 8 are respectively and fixedly installed with the two ends of the universal coupling 23, the universal coupling 23 can utilize the characteristics of the mechanism thereof to ensure that the two shafts are not on the same axis, the continuous rotation of the two shafts under the condition that an included angle exists between the axes, and reliably transmit torque and motion, the side wall of the rotating shaft is fixedly connected with a clamping mechanism for limiting the precision pipeline 28 after pipe expansion.

Fixture includes fixed connection at the first gear 7 of pivot lateral wall, 2 lateral walls sliding connection of riser have ring plate 32, ring plate 32's movement track is circularly, ring plate 32 lateral wall fixedly connected with annular rack 3, first gear 7 and the meshing of annular rack 3 are connected, a plurality of recesses 33 have been seted up to 2 inner wall equipartitions of riser, a plurality of recesses 33 are all along putting the radial setting in thing hole, the inside equal sliding connection of every recess 33 has L shape pole 34, L shape pole 34's one end all is equipped with grip block 37, a plurality of arc holes 41 have all been seted up to every ring plate 32 inner wall, arc hole 41 and the corresponding setting of L shape pole 34, every L shape pole 34 all runs through sliding connection inside a corresponding arc hole 41.

Fixture still sets up a plurality of arc walls 38 at riser 2 inner walls including the equipartition, every arc wall 38 inner wall all inlays and is equipped with electro-magnet 40, a plurality of bar magnets 39 of ring board 32 inner wall equipartition fixedly connected with, ring board 32 is inside a plurality of arc walls 38 of riser 2 inner walls through a plurality of bar magnets 39 sliding connection, the opposite mutual magnetic attraction of polarity of circular telegram electro-magnet 40 and bar magnet 39, every equal sliding connection of bar magnet 39 is inside an arc wall 38 that corresponds, 34 lateral wall fixedly connected with conducting strips of L shape pole, 41 inner wall fixedly connected with busbar 42 of arc hole, after the conducting strip and the busbar 42 looks butt of L shape pole 34 lateral wall, electro-magnet 40 circular telegram.

The jack has been seted up to the one end of L shape pole 34, and the jack inner wall has support column 36 through extension spring 35 elastic connection, and support column 36 keeps away from the one end and the grip block 37 fixed connection of jack, and support column 36 sliding connection is inside the jack, and extension spring 35 plays the effect of buffering to grip block 37.

The electromagnet 40 is electrically connected to the conductive sheet and the conductive strip 42, and the support post 36 is slidably connected inside the jack.

The inner wall of the base 1 is fixedly connected with an ejector block, the inner wall of the ejector block is connected with a third rod 6 in a penetrating and rotating mode, the side wall of the third rod 6 is fixedly connected with a second gear 5, the second gear 5 is meshed with an annular rack 3 to be connected, one end of the third rod 6 is fixedly connected with a U-shaped rod 24, the annular rack 3 drives the second gear 5 to rotate, the annular rack 3 further drives the third rod 6 to rotate through the second gear 5, and the third rod 6 drives the U-shaped rod 24 to rotate.

The symmetrical fixedly connected with rectangle box 26 of base 1 inner wall, the inside all sealed sliding connection of every rectangle box 26 has piston 27, and every piston 27 inner wall all rotates and is connected with push rod 25, and the one end that piston 27 was kept away from to push rod 25 rotates with the kink of U shape pole 24 and is connected, and U shape pole 24 rotates the back and drives two push rods 25 motion, and every push rod 25 all drives a corresponding piston 27 and in the inside reciprocating seal slip of rectangle box 26.

16 lateral wall fixedly connected with suction hood 30 of first pole, a plurality of dust absorption holes 31 have been seted up to suction hood 30 inner wall, rectangle box 26 inner wall runs through one-way intake pipe of fixedly connected with and one-way outlet duct, the other end of one-way intake pipe and the fixed intercommunication of a plurality of dust absorption holes 31, one-way intake pipe only allows the dust to follow suction in a plurality of dust absorption holes 31 to rectangle box 26 in, one-way outlet duct and external recycle bags fixed connection, one-way outlet duct only allows the dust in the rectangle box 26 to extrude to purify the collection in the external recycle bags.

In the invention, the precision pipeline 28 after pipe expansion is penetrated through the inside of the object placing hole, the motor 4 is opened, the output end of the motor 4 drives the rotating shaft to rotate, the rotating shaft drives the annular rack 3 to move through the first gear 7, the electric push rod is embedded in the inner wall of the rotating seat 43, the movable end of the electric push rod is in contact with the inner wall of the vertical plate 2 in a propping manner, the vertical plate 2 can only rotate after the movable end of the electric push rod retracts, the annular rack 3 drives the fixedly connected annular plate 32 to rotate for a certain angle, the annular plate 32 is connected in the plurality of arc-shaped grooves 38 of the vertical plate 2 in a sliding manner through the plurality of fixedly connected magnetic rods 39, the annular plate 32 drives the plurality of L-shaped rods 34 to slide for a certain distance along the inside of the groove 33 to the center of the object placing hole after sliding, and then the plurality of L-shaped rods 34 drive the clamping plate 37 to clamp and fix the side wall of the precision pipeline 28 after pipe expansion, when the precision pipeline 28 after being expanded with different pipe diameters is clamped and then polished, the tension spring 35 can play a role in buffering the clamping plate 37.

After conducting strip and the conducting strip 42 looks butt of L shape pole 34 lateral wall, electro-magnet 40 circular telegram, the opposite polarity each other of circular telegram electro-magnet 40 and bar magnet 39 is magnetic attraction, and then the circular telegram electro-magnet 40 carries out magnetism to bar magnet 39 and inhales fixedly, and then annular rack 3 will drive ring plate 32 and riser 2 synchronous rotation, a plurality of L shape poles 34 have carried out the centre gripping to the precision pipeline 28 after the expander this moment, ring plate 32 so, precision pipeline 28 after riser 2 and the expander will rotate in step, and can be through setting up the drive ratio of first gear 7 and annular rack 3, make annular rack 3 produce faster rotation.

The polishing roller part of the polisher 17 always offsets with the side wall of the precision pipeline 28 after pipe expansion, when the motor 4 drives the rotating shaft to rotate, the rotating shaft drives the reciprocating lead screw 8 to rotate through the universal coupling 23, and then the nut 11 of the threaded connection of the side wall of the reciprocating lead screw 8 drives the slider 12 to move, and the screw pitch of the reciprocating lead screw 8 is set, so as to control the sliding speed of the slider 12, so that the slider 12 drives the first rod 16 to move through the two rotating rods 13, the sliding column 15 arranged at one end of the first rod 16 is always in sliding connection inside the guide groove 14, and further in the sliding process of the slider 12, the polishing roller part of the polisher 17 always slides along the side wall of the precision pipeline 28 after pipe expansion, and then the side wall of the precision pipeline 28 after pipe expansion is polished and deburred.

When the precision pipeline 28 after the pipe expansion of different pipe diameters is polished, the conductive spring 19 can be electrified, the conductive spring 19 drives the adjusting block 44 to slide for a distance after being electrified, and then the adjusting block 44 drives the box body 9 to move for a distance, so that the box body 9 drives the polisher 17 to move for a distance through the slider 12, the rotating rod 13 and the first rod 16, and then the precision pipeline 28 after the pipe expansion of different pipe diameters can be polished, and the application range of the device is enlarged.

Meanwhile, the annular rack 3 drives the third rod 6 to rotate through the second gear 5, the third rod 6 drives the U-shaped rod 24 to rotate, the U-shaped rod 24 drives the two push rods 25 to move after rotating, each push rod 25 drives the corresponding piston 27 to slide in the rectangular box 26 in a reciprocating sealing manner, and then the dust generated by polishing is continuously sucked into the rectangular box 26 from the dust suction holes 31, and then the dust in the rectangular box 26 is extruded into an external environment-friendly bag to be purified and collected.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims

1. The utility model provides a precision pipeline equipment of polishing, includes base (1), its characterized in that, install roating seat (43) on base (1), roating seat (43) inner wall sliding connection has riser (2), riser (2) are the ring structure, base (1) roof is fixed with rectangular block (18), spout (29) have been seted up to rectangular block (18) inner wall, spout (29) inner wall has regulating block (44) through conductive spring (19) elastic connection, regulating block (44) inner wall is fixed with box body (9), box body (9) inner wall is fixed with bottom plate (10), guide way (14) have been seted up to bottom plate (10) inner wall, guide way (14) inner wall sliding connection has traveller (15), first pole (16) are installed to traveller (15) lateral wall, the one end of first pole (16) is fixed with polisher (17), a folding rod (20) is fixed on the inner wall of the first rod (16), a second rod (21) is fixed at the other end of the folding rod (20), a grinding rod (22) is fixed on the side wall of the second rod (21), the inner wall of the box body (9) is connected with a reciprocating screw rod (8) in a penetrating and rotating way, the side wall of the reciprocating screw rod (8) is in threaded connection with a nut (11), a sliding block (12) is fixed on the inner wall of the nut (11), the inner wall of the sliding block (12) is symmetrically and rotatably connected with rotating rods (13), the other ends of the two rotating rods (13) are respectively and rotatably connected with the inner wall of the first rod (16), a motor (4) is fixed on the inner wall of the base (1), a rotating shaft is fixed at the output end of the motor (4), the other end of the rotating shaft is connected with a reciprocating screw rod (8) through a universal coupling (23), and a clamping mechanism for limiting the precision pipeline (28) after pipe expansion is fixed on the side wall of the rotating shaft.

2. The precision pipeline grinding device according to claim 1, wherein the clamping mechanism comprises a first gear (7) fixedly connected to the side wall of the rotating shaft, a circular ring plate (32) is slidably connected to the side wall of the vertical plate (2), a circular rack (3) is fixed to the side wall of the circular ring plate (32), the first gear (7) is meshed with the circular rack (3) to be connected, a plurality of grooves (33) are formed in the inner wall of the vertical plate (2) in an evenly distributed mode, each groove (33) is internally and evenly slidably connected with an L-shaped rod (34), a clamping plate (37) is arranged at one end of each L-shaped rod (34), each circular ring plate (32) is internally provided with a plurality of arc-shaped holes (41), and each L-shaped rod (34) is connected inside one corresponding arc-shaped hole (41) in a penetrating and sliding mode.

3. The precision pipeline grinding device of claim 2, wherein the clamping mechanism further comprises a plurality of arc-shaped grooves (38) which are uniformly distributed on the inner wall of the vertical plate (2), each arc-shaped groove (38) is embedded with an electromagnet (40), a plurality of magnetic bars (39) are uniformly distributed on the inner wall of the circular ring plate (32), each magnetic bar (39) is slidably connected inside a corresponding arc-shaped groove (38), a conducting strip is fixed on the side wall of the L-shaped rod (34), and a conducting strip (42) is fixed on the inner wall of each arc-shaped hole (41).

4. The precision pipeline grinding equipment according to claim 3, wherein a jack is formed in one end of the L-shaped rod (34), a supporting column (36) is elastically connected to the inner wall of the jack through an extension spring (35), and one end, far away from the jack, of the supporting column (36) is fixedly connected with the clamping plate (37).

5. A precision pipe grinding apparatus as claimed in claim 4, wherein the electromagnet (40) is electrically connected to a conductive strip, conductive strip (42), and the support post (36) is slidably connected inside the socket.

6. The precision pipe grinding device according to claim 1, wherein the inner wall of the base (1) is fixed with a top block, the inner wall of the top block is connected with a third rod (6) in a penetrating and rotating manner, the side wall of the third rod (6) is fixed with a second gear (5), the second gear (5) is meshed and connected with the annular rack (3), and one end of the third rod (6) is fixed with a U-shaped rod (24).

7. The precise pipe grinding device according to claim 6, wherein the inner walls of the base (1) are symmetrically fixed with rectangular boxes (26), each rectangular box (26) is internally and slidably connected with a piston (27) in a sealing manner, each piston (27) is rotatably connected with a push rod (25) on the inner wall, and one end of the push rod (25) far away from the piston (27) is rotatably connected with the bent portion of the U-shaped rod (24).

8. The precision pipeline grinding equipment according to claim 7, wherein a dust hood (30) is fixed on the side wall of the first rod (16), a plurality of dust suction holes (31) are formed in the inner wall of the dust hood (30), a one-way air inlet pipe and a one-way air outlet pipe are fixedly arranged on the inner wall of the rectangular box (26) in a penetrating mode, and the other end of the one-way air inlet pipe is fixedly communicated with the plurality of dust suction holes (31).