A kind of polishing equipment for 3PE anticorrosive steel pipe port

Abstract

The present application relates to the technical field of 3PE anti-corrosion steel pipe processing, in particular to a polishing device for the port of 3PE anti-corrosion steel pipe, comprising a polishing box, a mounting frame is fixedly connected to the inner wall of one side of the polishing box, a dust hood is fixedly connected to the outer wall of the top of the mounting frame, a polishing disc is rotatably connected to the outer wall of one side of the mounting frame, two electric sliding rails are fixedly connected to the inner wall of the bottom of the polishing box, and a same support seat is slidably connected to the electric sliding rails. The present application overcomes the shortcomings of the prior art, by fixing the polishing disc through the mounting frame in the polishing box, and driving the support seat for clamping the steel pipe through the electric sliding rails, so as to facilitate polishing the port of 3PE anti-corrosion steel pipe, thereby effectively avoiding damage when the polishing disc moves, and by setting a sliding sleeve on the polishing box, which can slide, so as to facilitate auxiliary supporting the steel pipe, and by driving the arc-shaped plate through the electric telescopic rod on the fixing seat, the steel pipe can be conveniently pressed and fixed.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of 3PE anti-corrosion steel pipe processing, in particular to a 3PE anti-corrosion steel pipe port polishing device. BACKGROUND

[0002] The 3PE anti-corrosion steel pipe refers to a 3-layer polyethylene coating (MAPEC) outer anti-corrosion steel pipe, which is a commonly used anti-corrosion pipeline in China. The 3-layer polyethylene (3PE) anti-corrosion coating has been widely applied in the petroleum pipeline industry due to good corrosion resistance, water vapor permeability resistance and mechanical properties. The anti-corrosion layer of the 3PE anti-corrosion steel pipe is crucial to the service life of the buried pipeline. The pipelines made of the same material may be corroded after being buried underground for several decades or may leak after being buried underground for several years. This is because they adopt different outer anti-corrosion layers.

[0003] According to the search, the patent with the Chinese patent application number CN210968182U discloses a pipe end polishing device for 3PE steel pipe outer anti-corrosion, which comprises a bottom plate, a steel brush grinding head and a fixed plate. Both sides of the top of the bottom plate are fixedly provided with side plates. First bearings are arranged at the middle positions of the top of the opposite sides of the side plates. An activity screw rod is movably arranged between the two side plates through the first bearings. A sliding rod is arranged above the activity screw rod. A motor seat is arranged above the side plate side wall. A reduction motor is fixedly arranged on the top of the motor seat. One end of the activity screw rod is fixedly connected with the output end of the reduction motor. A screw rod sleeve is sleeved and arranged on the activity screw rod. A first connecting plate is welded on the bottom of the screw rod sleeve. A second connecting plate is welded on one end of the bottom of the first connecting plate. A connecting shaft is arranged on the bottom of the second connecting plate. The second connecting plate is movably arranged with a mounting plate through the connecting shaft. A second cylinder is fixedly arranged on the other end of the bottom of the first connecting plate. A second pneumatic telescopic rod is arranged on the output end of the second cylinder. The bottom end of the second pneumatic telescopic rod is fixedly connected with one end of the top of the mounting plate. An axle seat is arranged on one end of the bottom of the mounting plate. A driving motor is fixedly arranged at the middle position of the bottom of the mounting plate. A polishing rotating shaft is arranged on the output end of the driving motor. The polishing rotating shaft penetrates through the axle seat. The steel brush grinding head is fixedly arranged on one end of the polishing rotating shaft. The fixed plate is fixedly arranged on the top of the bottom plate and located between the two side plates. A first cylinder is fixedly arranged on the top of the bottom plate. A first pneumatic telescopic rod is arranged on the output end of the first cylinder. A moving plate is fixedly arranged on one end of the first pneumatic telescopic rod.

[0004] The pipe end polishing equipment for the outer corrosion prevention of the 3PE steel pipe in the above patent has the following disadvantages: in the above patent, the steel brush polishing head is driven to move by the movable screw rod to polish the port of the steel pipe, but the port area of the steel pipe is limited, and the large-amplitude movement of the steel brush polishing head will directly affect the polishing effect of the polishing head, and dust is easy to splash during polishing, which can easily cause air pollution around the polishing equipment. SUMMARY

[0005] The present application aims to solve or at least alleviate the problems existing in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a pipe end polishing equipment for 3PE corrosion-resistant steel pipe, comprising a polishing box, one side of the polishing box is fixedly connected with a mounting frame, and the top outer wall of the mounting frame is fixedly connected with a dust cover, one side of the mounting frame is rotatably connected with a polishing disc, the bottom inner wall of the polishing box is fixedly connected with two electric sliding rails, and the same support seat is slidably connected on the two electric sliding rails, the top outer wall of the support seat is fixedly connected with a fixed seat, the top outer wall of the fixed seat is provided with an arc-shaped slot, the outer wall of one side of the fixed seat is provided with two connecting grooves, and the inner wall of each connecting groove is fixedly connected with an electric telescopic rod, the output shaft of each electric telescopic rod is rotatably connected with an arc-shaped plate, the inner wall of one side of the polishing box is fixedly connected with a material guide pipe, the outer wall of one side of the polishing box is fixedly connected with a collecting box, and the top outer wall of the collecting box is provided with an air outlet, the inner wall of the air outlet is fixedly connected with a fan, the inner walls of the two sides of the collecting box are fixedly connected with the same partition plate, and the top outer wall of the partition plate is provided with a mounting opening, the inner wall of the mounting opening is fixedly connected with a mounting pipe, and the mounting pipe is connected with the dust cover through a pipeline.

[0007] By adopting the above structure, the dust cover is arranged on the mounting frame of the polishing disc, and the collecting box is arranged on the polishing box, the cooperation between the collecting box and the dust cover facilitates the collection of dust generated during polishing, the cooperation between the support seat and the fixed seat facilitates the fixation of the PE corrosion-resistant steel pipe, the electric telescopic rod facilitates the compression of the steel pipe by the arc-shaped plate, the electric sliding rail drives the movement of the support seat, thereby facilitating the contact between the steel pipe and the polishing disc, the arrangement of the material guide pipe facilitates the guiding and discharging of the impurities splashed during polishing, the waste materials splashed out during the rotation of the polishing disc during polishing are collected in the material guide pipe and discharged, thereby facilitating the treatment of the waste materials in the later stage.

[0008] The bottom outer wall of the collecting box is provided with a discharge opening, and the inner wall of the discharge opening is fixedly connected with a sealing plate.

[0009] By adopting the above structure, the sealing plate can be detached to facilitate the discharge of the dust collected in the collecting box, and the sealing plate closes the discharge opening during normal operation to avoid air leakage in the collecting box.

[0010] The outer wall of the bottom of the partition plate is provided with two circular openings, and the inner walls of the two circular openings are fixedly connected with dust removal filter cloths.

[0011] By adopting the above structure, the dust removal filter cloth is arranged to facilitate the filtration of dust, so that the collected dust is left in the collection box.

[0012] The inner wall of the top of the collection box is fixedly connected with two sliding rods, and the outer walls of the two sliding rods are sleeved with springs.

[0013] By adopting the above structure, the spring is sleeved on the sliding rod, and the sliding rod is fixed on the top of the collection box.

[0014] The outer walls of the two sliding rods are slidingly connected with the same connecting plate, the outer wall of the bottom of the connecting plate is fixedly connected with two knocking balls, and the two knocking balls are respectively in contact with the two dust removal filter cloths.

[0015] By adopting the above structure, the outer wall of the top of the partition plate is provided with two lifting mechanisms, the lifting mechanism is arranged to facilitate the driving of the connecting plate to rise, and in cooperation with the spring on the sliding rod, the knocking ball is arranged to impact on the dust removal filter cloth, so that the impurities adhered to the dust removal filter cloth are shaken off, effectively avoiding that too much impurities block the dust removal filter cloth to affect the filtering efficiency, and the sliding rod is arranged to facilitate the limitation of the movement track of the connecting plate, avoiding the deviation of the connecting plate.

[0016] The outer wall of one side of the polishing box is provided with a circular opening, and the outer wall of one side of the polishing box is fixedly connected with a mounting frame,

[0017] By adopting the above structure, the inner wall of the mounting frame is slidingly connected with a sliding sleeve, and the sliding sleeve slides in the mounting frame, thereby facilitating the auxiliary support of the steel pipe.

[0018] The inner wall of one side of the mounting frame is fixedly connected with a polishing motor, the output shaft of the polishing motor is fixedly connected with a belt pulley one, one end of the polishing disc transmission shaft is fixedly connected with a belt pulley two, and the same belt is connected between the belt pulley two and the belt pulley one.

[0019] By adopting the above structure, the polishing motor is arranged to drive the polishing disc to polish the steel pipe through the belt.

[0020] The outer wall of one side of the polishing box is provided with an opening, and the inner wall of the opening is hingedly connected with a box door, the outer wall of one side of the box door is provided with a rectangular opening, the inner wall of the rectangular opening is fixedly connected with an observation window, and the outer wall of the top of the polishing box is fixedly connected with a control panel.

[0021] By adopting the above structure, the control panel is arranged to facilitate the control of the electrical elements on the polishing box.

[0022] The lifting mechanism comprises a lifting pipe, and the lifting pipe is fixedly connected to the partition plate, the inner wall of the lifting pipe is slidably connected with a driving column, the outer wall of the bottom of the driving column is fixedly connected with a magnet, and the inner wall of the bottom of the lifting pipe is fixedly connected with an electromagnet.

[0023] Through the above structure, the electromagnet is powered to generate the same magnetism as the magnet, thereby facilitating the driving of the driving column to rise, and the driving column directly jacks up the connecting plate.

[0024] The lifting mechanism comprises a lifting pipe, and the lifting pipe is fixedly connected to the partition plate, the inner wall of the lifting pipe is slidably connected with a driving column, the inner wall of the bottom of the driving column is fixedly connected with a magnet, and the inner wall of the bottom of the lifting pipe is fixedly connected with an electromagnet.

[0025] Through the above structure, the electromagnet is powered to generate the same magnetism as the magnet, thereby facilitating the driving of the driving column to rise, and the driving column directly jacks up the connecting plate.

[0026] Compared with the prior art, the beneficial effects of the present application are:

[0027] (1) The present application fixes the grinding disc in the grinding box through the mounting frame, and drives the support seat of the clamping steel pipe through the electric sliding rail, thereby facilitating the grinding of the 3PE anti-corrosion steel pipe port, effectively avoiding damage to the grinding disc when it moves, and setting a sliding sleeve on the grinding box, thereby facilitating the auxiliary support of the steel pipe, and driving the arc-shaped plate by the electric telescopic rod on the fixing seat to conveniently press and fix the steel pipe;

[0028] (2) The present application sets a dust hood above the grinding disc, and sets a collecting box on the grinding box, which cooperates with the dust hood to facilitate the collection of dust generated during grinding through the collecting box, effectively avoiding the pollution of the air around the grinding equipment caused by the dust generated during grinding, and the setting of the guide pipe facilitates the direct discharge of the waste generated during grinding;

[0029] (3) The present application sets a lifting mechanism driven connecting plate on the partition plate, and sets two knocking balls on the connecting plate, which facilitates the knocking of the dust removal filter cloth to shake off the adhered impurities, the dust removal filter cloth on the partition plate effectively retains the collected dust in the collecting box, and the detachable sealing plate facilitates the treatment of the collected dust. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0031] Figure 2 It is a schematic diagram of the cross-sectional structure of the grinding box of the present application;

[0032] Figure 3 Support seat structure schematic diagram of the present application;

[0033] Figure 4 Mounting frame structure schematic diagram of the present application;

[0034] Figure 5 Collecting box structure schematic diagram of the present application;

[0035] Figure 6 Collecting box internal structure schematic diagram of the present application;

[0036] Figure 7 Partition structure schematic diagram of the present application;

[0037] Figure 8 Partition front view structure schematic diagram of the present application;

[0038] Figure 9 Lifting mechanism cross-section structure schematic diagram of embodiment one of the present application;

[0039] Figure 10 Lifting mechanism cross-section structure schematic diagram of embodiment two of the present application.

[0040] In the figure: 1, polishing box; 2, control panel; 3, collecting box; 4, fan; 5, box door; 6, observation window; 7, mounting frame; 8, sliding sleeve; 9, round port; 10, electric sliding rail; 11, support seat; 12, material guide pipe; 13, mounting frame; 14, dust cover; 15, polishing disc; 16, fixed seat; 17, arc-shaped slot; 18, arc-shaped plate; 19, electric telescopic rod; 20, belt; 21, polishing motor; 22, partition; 23, dust removal filter cloth; 24, mounting pipe; 25, sealing plate; 26, connecting plate; 27, sliding rod; 28, spring; 29, knocking ball; 30, lifting mechanism; 31, lifting pipe; 32, driving column; 33, magnet; 34, electromagnet; 35, air cylinder. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] Embodiment one

[0043] Please refer to Figures 1-9The utility model provides a kind of 3PE anticorrosive steel pipe port polishing equipment, including polishing box 1, the inner wall of one side of polishing box 1 is fixedly connected with mounting bracket 13, and the outer wall of the top of mounting bracket 13 is fixedly connected with dust hood 14, the outer wall of one side of mounting bracket 13 is rotatably connected with polishing disc 15, the inner wall of the bottom of polishing box 1 is fixedly connected with two electric slide rails 10, and the same support base 11 is slidably connected on two electric slide rails 10, the outer wall of the top of support base 11 is fixedly connected with fixed seat 16, arc slot 17 is opened in the outer wall of the top of fixed seat 16, two connecting grooves are opened in the outer wall of one side of fixed seat 16, and the inner wall of two connecting grooves is fixedly connected with electric telescopic rod 19, the output shaft of two electric telescopic rods 19 is rotatably connected with arc plate 18, the inner wall of one side of polishing box 1 is fixedly connected with guide pipe 12, the outer wall of one side of polishing box 1 is fixedly connected with collecting box 3, and the outer wall of the top of collecting box 3 is fixedly connected with air outlet, the inner wall of air outlet is fixedly connected with fan 4, the inner wall of the two sides of collecting box 3 is fixedly connected with the same baffle 22, and the outer wall of the top of baffle 22 is fixedly connected with mounting pipe 24, and mounting pipe 24 is connected on dust hood 14 by pipeline, by being provided with dust hood 14 on the mounting bracket 13 of polishing disc 15, and being provided with collecting box 3 on polishing box 1, the cooperation between collecting box 3 and dust hood 14 is convenient to collect the dust generated during polishing, by the cooperation between support base 11 and fixed seat 16, it is convenient to fix 3PE anticorrosive steel pipe, electric telescopic rod 19 is convenient to drive arc plate 18 and compress steel pipe, electric slide rail 10 drives support base 11 to move, and then it is convenient to drive steel pipe and polishing disc 15 to contact, the setting of guide pipe 12 is convenient to guide and discharge the impurities splashed during polishing, and the direction of steel pipe port rotates along with polishing disc 15 during polishing and will splash the waste material of polishing, the waste material is integrated into guide pipe 12 and is discharged to be convenient to collect, and then it is convenient to handle in later period.

[0044] Specifically, refer to Figure 6 The outer wall of the bottom of collecting box 3 is provided with discharge port, and the inner wall of discharge port is fixedly connected with sealing plate 25, and the detachable sealing plate 25 is convenient to guide the dust collected in collecting box 3 to export, sealing plate 25 closes discharge port during normal operation, to avoid the situation that collecting box 3 leaks air.

[0045] Specifically, refer to Figure 6 The outer wall of the bottom of baffle 22 is provided with two round mouths, and the inner wall of two round mouths is fixedly connected with dust removal filter cloth 23, and the setting of dust removal filter cloth 23 is convenient to filter dust, to facilitate the dust collected to remain in collecting box 3, air can pass through when passing through dust removal filter cloth 23, dust cannot pass through dust removal filter cloth 23 to facilitate dust to remain in collecting box 3.

[0046] Specifically, refer to Figures 7-8The inner wall of the top of the collecting box 3 is fixedly connected with two slide rods 27, and the outer walls of the two slide rods 27 are sleeved with springs 28, the springs 28 are sleeved on the slide rods 27, and the slide rods 27 are fixed on the top of the collecting box 3.

[0047] Specifically, please refer to Figures 7-8 The outer walls of the two slide rods 27 are slidingly connected with the same connecting plate 26, the bottom outer wall of the connecting plate 26 is fixedly connected with two knocking balls 29, and the two knocking balls 29 are in contact with the two dust removal filter cloths 23 respectively, the top outer wall of the partition plate 22 is provided with two lifting mechanisms 30, the setting of the lifting mechanism 30 facilitates the driving of the connecting plate 26 to rise, and in cooperation with the spring 28 on the slide rod 27, the knocking ball 29 is driven to impact on the dust removal filter cloth 23, so as to shake off the impurities adhered on the dust removal filter cloth 23, effectively avoiding that too much impurities block the dust removal filter cloth 23 to affect the filtering efficiency, and the setting of the slide rod 27 facilitates the restriction of the movement track of the connecting plate 26, avoiding the deviation of the connecting plate 26.

[0048] Specifically, please refer to Figure 2 A circular port 9 is formed in one side outer wall of the polishing box 1, and a mounting frame 7 is fixedly connected to one side outer wall of the polishing box 1, and a sliding sleeve 8 is slidingly connected to the inner wall of the mounting frame 7, and the sliding sleeve 8 slides in the mounting frame 7, thereby facilitating auxiliary support of the steel pipe.

[0049] Specifically, please refer to Figure 4 One side inner wall of the mounting frame 13 is fixedly connected with a polishing motor 21, and a belt pulley one is fixedly connected to the output shaft of the polishing motor 21, one end of the transmission shaft of the polishing disc 15 is fixedly connected with a belt pulley two, and the same belt 20 is connected between the belt pulley two and the belt pulley one, and the polishing motor 21 is provided in cooperation with the belt 20 to directly drive the polishing disc 15 to polish the steel pipe.

[0050] Specifically, please refer to Figure 1 An opening is formed in one side outer wall of the polishing box 1, and a box door 5 is hinged to the inner wall of the opening, one side outer wall of the box door 5 is provided with a rectangular opening, and the inner wall of the rectangular opening is fixedly connected with an observation window 6, and the top outer wall of the polishing box 1 is fixedly connected with a control panel 2, and the control panel 2 is provided to facilitate the control of the electrical elements on the polishing box 1.

[0051] Specifically, please refer to Figure 9 The lifting mechanism 30 comprises a lifting pipe 31, and the lifting pipe 31 is fixedly connected to the partition plate 22, the inner wall of the lifting pipe 31 is slidingly connected with a driving column 32, the bottom outer wall of the driving column 32 is fixedly connected with a magnet 33, and the bottom inner wall of the lifting pipe 31 is fixedly connected with an electromagnet 34, and the electromagnet 34 is energized to generate the same magnetism as the magnet 33, thereby facilitating the driving of the driving column 32 to rise, and the driving column 32 directly jacks up the connecting plate 26.

[0052] Working principle: in use, first, the steel pipe is put into the arc-shaped groove 17 through the sliding sleeve 8, then the arc-shaped plate 18 is rotated to be located directly above the steel pipe, and then the electric telescopic rod 19 is started to drive the arc-shaped plate 18 to descend, and the two arc-shaped plates 18 directly press the steel pipe when descending, when polishing, the polishing motor 21 is started, the polishing disc 15 is driven to rotate through the belt 20, and the support seat 11 is driven to move horizontally through the electric sliding rail 10, when the support seat 11 moves horizontally, the steel pipe port and the polishing disc 15 are brought into contact for polishing, at the same time of polishing, the fan 4 is started, when the fan 4 is started, the dust diffused is sucked into the collecting box 3 through the dust suction cover 14, and the dust is filtered through the dust removal filter cloth 23 on the partition plate 22 and left in the collecting box 3, when it is needed to treat the dust in the collecting box 3, the sealing plate 25 is opened to guide the dust in the collecting box 3 out, long-time filtering will cause a large amount of impurities to adhere to the dust removal filter cloth 23, at this time, the electromagnet 34 in the lifting mechanism 30 is electrified to generate the same magnetism as the magnet 33, and then directly drives the driving column 32 to rise, when the driving column 32 rises, the connecting plate 26 is directly driven to rise, when the connecting plate 26 rises, the spring 28 is compressed, when the electromagnet 34 is de-energized, the spring 28 directly drives the connecting plate 26 to descend, when the connecting plate 26 descends, the knocking ball 29 and the dust removal filter cloth 23 are brought into contact, and the impurities adhering to the dust removal filter cloth 23 can be shaken off by repeating the operation, the material guide pipe is convenient for guiding and discharging the impurities splashed during polishing, the steel pipe port will splash the polishing waste along the direction of rotation of the polishing disc, the waste enters the material guide pipe to be integrated and discharged, and then the waste is conveniently collected for later treatment.

[0053] Embodiment 2

[0054] Based on embodiment 1, this embodiment introduces a specific structure of the lifting mechanism 30 in the 3PE anti-corrosion steel pipe port polishing equipment, as shown in Figure 10 The lifting mechanism 30 comprises a lifting pipe 31, the lifting pipe 31 is fixedly connected to the partition plate 22, the inner wall of the lifting pipe 31 is slidably connected with a driving column 32, a gas cylinder 35 is fixedly connected to the inner wall of the bottom of the lifting pipe 31, and the piston rod of the gas cylinder 35 is fixedly connected to the driving column 32, the gas cylinder 35 is convenient for directly jacking the driving column 32, and then conveniently driving the connecting plate 26 to rise, when the connecting plate 26 rises, the knocking ball 29 is directly driven to rise, when the gas cylinder 35 returns to the original position, the knocking ball 29 will impact the dust removal filter cloth 23, so as to shake off the impurities adhering to the dust removal filter cloth 23.

[0055] The above merely describes the preferred embodiments of the present application and is not used to limit the present application, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A polishing device for 3PE anticorrosive steel pipe end port, comprising a polishing box (1), characterized in that: The side inner wall of the polishing box (1) is fixedly connected with a mounting rack (13), and the top outer wall of the mounting rack (13) is fixedly connected with a dust cover (14); the side outer wall of the mounting rack (13) is rotatably connected with a polishing disc (15); the bottom inner wall of the polishing box (1) is fixedly connected with two electric sliding rails (10), and the same support seat (11) is slidably connected on the two electric sliding rails (10); the top outer wall of the support seat (11) is fixedly connected with a fixing seat (16); the top outer wall of the fixing seat (16) is provided with an arc-shaped groove (17); the side outer wall of the fixing seat (16) is provided with two connecting grooves, and the inner walls of the two connecting grooves are fixedly connected with electric telescopic rods (19); the output shafts of the two electric telescopic rods (19) are rotatably connected with arc-shaped plates (18); the side inner wall of the polishing box (1) is fixedly connected with a material guide pipe (12); the side outer wall of the polishing box (1) is fixedly connected with a collecting box (3), and the top outer wall of the collecting box (3) is provided with an air outlet; the inner wall of the air outlet is fixedly connected with a fan (4); the inner walls of the two side walls of the collecting box (3) are fixedly connected with the same partition plate (22), and the top outer wall of the partition plate (22) is provided with a mounting opening; the inner wall of the mounting opening is fixedly connected with a mounting pipe (24), and the mounting pipe (24) is connected with the dust cover (14) through a pipeline; The bottom outer wall of the collecting box (3) is provided with a discharge opening, and the inner wall of the discharge opening is fixedly connected with a sealing plate (25); The bottom outer wall of the partition plate (22) is provided with two circular openings, and the inner walls of the two circular openings are fixedly connected with dust removal filter cloths (23); The top inner wall of the collecting box (3) is fixedly connected with two sliding rods (27), and the outer walls of the two sliding rods (27) are sleeved with springs (28); The outer walls of the two sliding rods (27) are slidably connected with the same connecting plate (26), the bottom outer wall of the connecting plate (26) is fixedly connected with two knocking balls (29), and the two knocking balls (29) are respectively in contact with the two dust removal filter cloths (23); the top outer wall of the partition plate (22) is provided with two lifting mechanisms (30).

2. A polishing apparatus for 3PE anticorrosive steel pipe end according to claim 1, characterized in that: The side outer wall of the polishing box (1) is provided with a circular opening (9), and the side outer wall of the polishing box (1) is fixedly connected with a mounting frame (7); the inner wall of the mounting frame (7) is slidably connected with a sliding sleeve (8). ​ 3. A device for polishing the end of a 3PE anticorrosive steel pipe according to claim 1, characterized in that: The side inner wall of the mounting rack (13) is fixedly connected with a polishing motor (21), and the output shaft of the polishing motor (21) is fixedly connected with a belt pulley I; one end of the transmission shaft of the polishing disc (15) is fixedly connected with a belt pulley II, and the belt pulley II and the belt pulley I are connected with the same belt (20).

4. The apparatus for polishing the end of a 3PE anticorrosion steel pipe according to claim 1, characterized in that: The side outer wall of the polishing box (1) is provided with an opening, and the inner wall of the opening is hingedly connected with a box door (5); the side outer wall of the box door (5) is provided with a rectangular opening, and the inner wall of the rectangular opening is fixedly connected with an observation window (6); the top outer wall of the polishing box (1) is fixedly connected with a control panel (2).

5. The apparatus for polishing the end of a 3PE anticorrosion steel pipe according to claim 1, characterized in that: The lifting mechanism (30) comprises a lifting pipe (31), the lifting pipe (31) is fixedly connected to the partition plate (22), the inner wall of the lifting pipe (31) is slidably connected with a driving column (32), the outer wall of the bottom of the driving column (32) is fixedly connected with a magnet (33), and the inner wall of the bottom of the lifting pipe (31) is fixedly connected with an electromagnet (34).

6. A device for polishing the end of a 3PE anticorrosive steel pipe according to claim 1, characterized in that: The lifting mechanism (30) comprises a lifting pipe (31), the lifting pipe (31) is fixedly connected to the partition plate (22), the inner wall of the lifting pipe (31) is slidably connected with a driving column (32), the inner wall of the bottom of the lifting pipe (31) is fixedly connected with a pneumatic cylinder (35), and the piston rod of the pneumatic cylinder (35) is fixedly connected to the driving column (32).

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