Plastic pipe surface polishing equipment

Abstract

The invention relates to the technical field of plastic pipe machining, in particular to plastic pipe surface grinding equipment. Comprising a polishing table, a lower feeding unit is arranged at the top of the polishing table, and a polishing unit is arranged at the output end of the lower feeding unit; the grinding unit comprises a grinding outer ring, a middle through groove is formed in the center of the grinding outer ring, and a crescent fixed plate is arranged on one side wall of the middle through groove; a second electric push rod is arranged on the inner wall of the side, away from the crescent fixed plate, of the polishing outer ring, and the output end of the second electric push rod extends into the middle through groove. The groups of grinding sand balls are arranged at equal intervals along a spiral path, and when a pipe is in rolling friction with the groups of grinding sand balls in a moving and autorotation state, traditional spiral grinding traces can be offset. And each group of polishing sand balls are simultaneously contacted with the pipe from different directions around, so that polishing dead angles are avoided, and the working quality is ensured while the polishing effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic pipe processing, and in particular relates to a plastic pipe surface grinding device. Background Art

[0002] After plastic pipes are processed or left standing for a long time, uneven oxides will appear on their surface, so the surface of the pipes needs to be polished.

[0003] After searching, the cited announcement number is CN221020286U, the announcement date is May 28, 2024, and the patent document named a plastic pipe grinding device includes a workbench, a slide groove is opened on the upper surface of the workbench, an electric push rod is fixedly connected to one side of the inner wall of the slide groove, one end of the electric push rod is fixedly connected to a slider, the upper surface of the slider is fixedly connected to a fixed frame, one side of the fixed frame is fixedly connected to a motor mounting frame, one side of the motor mounting frame is fixedly connected to a servo motor, the output end of the servo motor is fixedly connected to a first pulley, the outer surface of the first pulley is sleeved with a first belt, the first pulley is connected to a second pulley through the first belt transmission, the outer surface of the second pulley is sleeved with a second belt, the second pulley is connected to a third pulley through the second belt transmission, and one side of the first pulley, the second pulley and the third pulley are fixedly connected to a rotating shaft. The above embodiment can grind both ends of the pipeline without the need for the staff to re-position the pipeline, which greatly reduces the labor intensity of the staff, saves time, and improves the efficiency of pipeline grinding.

[0004] However, the above embodiment still has the following defects:

[0005] The above embodiment still uses a conventional cylindrical grinding roller. When the pipe is conveyed in a rotating state, the grinding marks left by the grinding roller on the surface of the pipe are spiral structures, which affects the grinding effect. In addition, the grinding roller is fixed in position and can only contact the pipe from a single direction, which easily causes a grinding dead angle, thereby reducing the work quality. Summary of the invention

[0006] In view of the above problems, the present invention provides a plastic pipe surface grinding device, comprising a grinding table, a lower feeding unit is provided on the top of the grinding table, and a grinding unit is provided on the output end of the lower feeding unit;

[0007] The grinding unit comprises a grinding outer ring, a central through groove is formed at the center of the grinding outer ring, and a crescent fixed plate is provided on one side wall of the central through groove; a second electric push rod is provided on the inner wall of the grinding outer ring away from the crescent fixed plate, and the output end of the second electric push rod extends into the central through groove and is provided with a crescent movable plate; the crescent fixed plate and the crescent movable plate are combined to form a cylindrical grinding component; spiral scrapers are spirally distributed on the inner wall of the cylindrical grinding component, and a plurality of groups of grinding sand balls are arranged at equal intervals on the spiral scrapers;

[0008] The lower feeding unit drives the pipe to rotate while conveying the pipe. Several groups of grinding balls distributed along the spiral path slide and rub against the surface of the pipe in turn to grind it, thereby offsetting the spiral texture caused by the traditional grinding wheel.

[0009] Furthermore, the lower feeding unit includes a lower feeding table, the direction of the lower feeding table is the same as that of the grinding table, and the top of the lower feeding table is provided with a lower feeding pipe groove with both ends open along its own length direction; a lower transmission component is provided at the end port of the lower feeding table away from the grinding unit, and the input end of the lower transmission component is connected to the first motor.

[0010] Furthermore, the output end of the lower transmission component is connected to two groups of first rotating rods, and the two groups of first rotating rods are symmetrically arranged at the top two side edges of the lower feeding pipe groove in the horizontal direction; and each group of the first rotating rods has several groups of lower feeding mechanisms arranged at equal intervals.

[0011] Furthermore, the lower feeding mechanism includes a feeding sleeve roller, which is sleeved on a corresponding group of first rotating rods, and a spiral feeding groove is spirally distributed on the side wall of the feeding sleeve roller; a central annular groove is opened at the center of the outer wall of the feeding sleeve roller, and a plurality of groups of scraping strips are distributed in a circular array in the central annular groove, and a plurality of groups of scraping openings are arranged at equal intervals on a side wall of the scraper strip away from the central axis of the central annular groove.

[0012] Furthermore, an upper feeding unit is lifted and lowered directly above the lower feeding unit, and the upper feeding unit has the same structure as the lower feeding unit and is symmetrically arranged with respect to each other.

[0013] Furthermore, two groups of dust collecting inner rings are symmetrically arranged on both sides of the second electric push rod, the central axis of the dust collecting inner ring coincides with the central axis of the central through groove, and a plurality of groups of horn channels are evenly distributed on the inner wall of the dust collecting inner ring. The other end of the horn channel extends into the central through groove, and the inner diameter of the horn channel close to one end of the dust collecting inner ring is smaller than the inner diameter of the other end.

[0014] Furthermore, a traction unit is provided on a side of the grinding unit away from the lower feeding unit, and the traction unit includes a traction outer ring, the traction outer ring is a circular ring structure, and the central axis coincides with the central axis of the central through groove.

[0015] Furthermore, a third motor is provided on the top of the traction outer ring, the output end of the third motor extends into the cavity of the traction outer ring, and is transmission-connected with a bevel gear; a helical gear is provided in the cavity of the traction outer ring, the central axis of the helical gear coincides with the central axis of the traction outer ring, and the helical gear is meshingly connected with the bevel gear.

[0016] Furthermore, a ball bearing seat is rotatably connected to the inner wall of the central through hole of the traction outer ring, and the inner wall of the bevel gear and the outer wall of the ball bearing seat are connected to each other; a traction inner ring is installed on the inner wall of the ball bearing seat, and a plurality of groups of third electric push rods are distributed in a circular array in the cavity of the traction inner ring, and the output end of the third electric push rod extends to the central through hole of the traction inner ring and is installed with a pipe clamp.

[0017] Furthermore, the bottom of the traction outer ring is transmission-connected with an electric slide, and the electric slide horizontally extends from a side close to the grinding unit to a side away from the grinding unit.

[0018] The beneficial effects of the present invention are:

[0019] 1. By setting a spiral scraper with a spiral structure and arranging each group of grinding balls at equal intervals along its spiral path, when the pipe rolls and rubs against each group of grinding balls while moving and rotating, the traditional spiral grinding marks will be offset. In addition, each group of grinding balls contacts the pipe from different directions at the same time, thus avoiding grinding dead corners, improving the grinding effect and ensuring the work quality.

[0020] 2. By adding several groups of upper feeding mechanisms and cooperating with each group of lower feeding mechanisms, the pipe surface is simultaneously acted on from different directions, which improves the stability of the pipe during transmission and grinding, and will not cause the pipe to deviate due to insufficient straightness of the pipe or vibration during grinding. In addition, the upper feeding mechanism can be raised and lowered, and the height of each group of upper feeding mechanisms can be adjusted according to the diameter of the pipe, which improves the stability of the pipe and the compatibility of the equipment.

[0021] 3. Fix one end of the pipe after grinding through each set of pipe clamps, and then drive the pipe to gradually move to the side away from the lower feeding unit through the electric slide. When grinding the pipe, there are conveying mechanisms at both ends, which further improves the stability during grinding, and at the end of grinding, the edge of the tail will not be unable to be conveyed because it is separated from the lower feeding unit, so that all parts of the pipe surface can be ground without manual pulling, which improves the grinding stability, makes the grinding work more thorough, and also improves the automation of the equipment.

[0022] 4. By setting the grinding sand ball as a spherical detachable structure, the contact area between the grinding sand ball and the pipe is increased, thereby improving the durability of the grinding sand ball. In addition, by utilizing its detachable characteristics, the durability of the grinding sand ball is improved while also improving the convenience of later maintenance.

[0023] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic structural diagram of a grinding device according to an embodiment of the present invention is shown.

[0026] Figure 2 A schematic structural diagram of a lower feeding unit according to an embodiment of the present invention is shown.

[0027] Figure 3 A schematic structural diagram of a lower feeding mechanism according to an embodiment of the present invention is shown.

[0028] Figure 4 A schematic structural diagram of an upper feeding unit according to an embodiment of the present invention is shown.

[0029] Figure 5 A schematic structural diagram of a grinding unit according to an embodiment of the present invention is shown.

[0030] Figure 6 A schematic top cross-sectional view of a grinding unit according to an embodiment of the present invention is shown.

[0031] Figure 7 The embodiment of the present invention is shown Figure 6 Enlarged schematic diagram within circle A in the middle.

[0032] Figure 8 A schematic diagram of an exploded view of a crescent fixed plate and a crescent movable plate according to an embodiment of the present invention is shown.

[0033] Fig. 9 A schematic structural diagram of a grinding sand ball according to an embodiment of the present invention is shown.

[0034] Fig.10 A structural schematic diagram of a traction unit according to an embodiment of the present invention is shown.

[0035] Fig.11 A schematic cross-sectional view of a traction outer ring according to an embodiment of the present invention is shown.

[0036] In the figure: 100, grinding table; 200, lower feeding unit; 210, lower feeding table; 211, lower feeding pipe groove; 220, first motor; 221, lower transmission component; 230, first rotating rod; 240, lower feeding mechanism; 241, feeding sleeve roller; 242, spiral feeding groove; 243, center ring groove; 244, scraper; 245, scraper mouth; 300, upper feeding unit; 310, side bracket; 311, top plate; 320, first electric push rod; 330, upper feeding table; 340, second motor; 341, upper transmission component; 350, second rotating rod; 360, Upper feeding mechanism; 400, grinding unit; 410, grinding outer ring; 411, middle through groove; 420, crescent fixed plate; 430, second electric push rod; 440, crescent movable plate; 450, dust collecting inner ring; 460, horn channel; 470, spiral scraper; 480, grinding ball base; 490, grinding sand ball; 500, traction unit; 501, electric slide; 510, traction outer ring; 520, third motor; 521, bevel gear; 530, helical gear; 540, ball bearing seat; 550, traction inner ring; 560, third electric push rod; 570, pipe pallet. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The embodiment of the present invention provides a plastic pipe surface grinding device. For example, Figure 1 As shown, it includes a grinding table 100, a lower feeding unit 200 is arranged on the top of the grinding table 100 along its own length direction, an upper feeding unit 300 is arranged directly above the lower feeding unit 200, and the bottom of the upper feeding unit 300 is movably attached to the top of the lower feeding unit 200. The upper feeding unit 300 and the lower feeding unit 200 are used to drive the pipe to rotate while conveying the pipe.

[0039] A grinding unit 400 is provided on the output end of the lower feeding unit 200. The grinding unit 400 is used to grind the surface of the pipe.

[0040] A traction unit 500 is provided on one side of the grinding unit 400 away from the lower feeding unit 200. The traction unit 500 is used to pull the polished pipe out of the grinding unit 400.

[0041] For example, Figure 2 As shown, the lower feeding unit 200 includes a lower feeding platform 210, the direction of the lower feeding platform 210 is the same as that of the grinding platform 100, and a lower feeding pipe groove 211 with both ends open is opened on the top of the lower feeding platform 210 along its own length direction. A lower transmission component 221 is provided at the end of the lower feeding platform 210 away from the grinding unit 400, and a first motor 220 is connected to the input end of the lower transmission component 221, and two groups of first rotating rods 230 are connected to the output end of the lower transmission component 221. The two groups of the first rotating rods 230 are symmetrically arranged at the top two side edges of the lower feeding pipe groove 211 in the horizontal direction. A plurality of groups of lower feeding mechanisms 240 are arranged at equal intervals on each group of the first rotating rods 230.

[0042] Preferably, the lower transmission component 221 adopts but is not limited to a pulley and a belt.

[0043] For example, Figure 3 As shown, the lower feeding mechanism 240 includes a feeding sleeve roller 241, which is sleeved on a corresponding group of first rotating rods 230, and a spiral feeding groove 242 is spirally distributed on the side wall of the feeding sleeve roller 241. A central annular groove 243 is opened at the center of the outer wall of the feeding sleeve roller 241, and a plurality of groups of scraping strips 244 are distributed in a circular array in the central annular groove 243. A plurality of groups of scraping openings 245 are arranged at equal intervals on a side wall of the scraping strip 244 away from the central axis of the central annular groove 243.

[0044] For example, Figure 4 As shown, the upper feeding unit 300 includes a side bracket 310, the bottom of which is installed on the grinding table 100, and a top plate 311 is installed on the top of the side bracket 310. The top plate 311 is located directly above the lower feeding unit 200, and a first electric push rod 320 is installed at the bottom of the top plate 311. The bottom of the first electric push rod 320 is provided with an upper feeding component, and the upper feeding component includes an upper feeding table 330, a second motor 340, an upper transmission component 341, two groups of second rotating rods 350, and several groups of upper feeding mechanisms 360 arranged on the two groups of second rotating rods 350.

[0045] Specifically, the upper feeding platform 330, the second motor 340, the upper transmission component 341, the two sets of second rotating rods 350 and the upper feeding mechanisms 360 are respectively the same in structure as the lower feeding platform 210, the first motor 220, the lower transmission component 221, the two sets of first rotating rods 230 and the lower feeding mechanisms 240, and are symmetrically arranged. Each set of the upper feeding mechanisms 360 is movably attached to the corresponding set of lower feeding mechanisms 240.

[0046] When grinding is required, the pipe is placed horizontally between the two groups of first rotating rods 230 and connected to each group of lower feeding mechanism 240. Then the first electric push rod 320 is started, and the upper feeding component is driven to descend as a whole by the first electric push rod 320 until each group of upper feeding mechanism 360 is attached to the surface of the pipe. Then the first motor 220 and the second motor 340 are started at the same time, so that each group of upper feeding mechanism 360 and each group of lower feeding mechanism 240 rotate at the same time, and while rotating, the spiral feeding trough 242 is used to horizontally transfer the pipe to one side of the grinding unit 400, thereby driving the pipe to rotate.

[0047] By adding several groups of upper feeding mechanisms 360, and in cooperation with each group of lower feeding mechanisms 240, the upper feeding mechanisms 360 act on the surface of the pipe from different directions at the same time, thereby improving the stability of the pipe during transportation and grinding, and preventing the pipe from being offset due to insufficient straightness of the pipe or vibration during grinding. In addition, the upper feeding mechanisms 360 are adjustable, and the height of each group of upper feeding mechanisms 360 can be adjusted according to the diameter of the pipe, thereby improving the stability of the pipe and the compatibility of the equipment.

[0048] For example, Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, the grinding unit 400 includes a grinding outer ring 410, and a central through groove 411 is opened at the center of the grinding outer ring 410, and the central axis of the central through groove 411 coincides with the central axis of the lower delivery pipe groove 211. A crescent fixed plate 420 with a fan-shaped structure in side view cross section is provided on one side wall of the central through groove 411. A second electric push rod 430 is provided on the inner wall of the grinding outer ring 410 away from the crescent fixed plate 420, and the output end of the second electric push rod 430 extends into the central through groove 411, and a crescent movable plate 440 with a fan-shaped structure in side view cross section is installed. The crescent fixed plate 420 and the crescent movable plate 440 are movably fitted to each other, and after fitting, they form a cylindrical grinding component.

[0049] Specifically, a spiral scraper 470 is spirally distributed on the inner wall of the cylindrical grinding component, and a plurality of groups of grinding ball bases 480 are arranged at equal intervals on the spiral scraper 470 , and grinding sand balls 490 are movably mounted on the grinding ball bases 480 .

[0050] Specifically, two groups of dust collecting inner rings 450 are symmetrically arranged on both sides of the second electric push rod 430, the central axis of the dust collecting inner ring 450 coincides with the central axis of the central through groove 411, and a plurality of groups of horn channels 460 are evenly distributed on the inner wall of the dust collecting inner ring 450, and the other end of the horn channel 460 extends into the central through groove 411, and the inner diameter of the horn channel 460 close to one end of the dust collecting inner ring 450 is smaller than the inner diameter of the other end.

[0051] First, adjust the position of the crescent movable plate 440 according to the diameter of the pipe until the pipe and each group of grinding balls 490 can fit together. After the pipe enters the cavity of the cylindrical grinding component, it uses its own rotation to roll and rub against each group of grinding balls 490, thereby realizing the grinding function. Since the pipe rotates when it moves horizontally, the conventional disc-shaped grinding wheel is prone to leave grinding marks of spiral structure when grinding the surface of the pipe. By setting a spiral scraper 470 with a spiral structure and arranging each group of grinding balls 490 at equal intervals along its spiral path, when the pipe rolls and rubs against each group of grinding balls 49 in a moving and self-rotating state, the traditional spiral grinding marks will be offset. And each group of grinding balls 490 contacts the pipe from all directions, thus avoiding grinding dead angles, while improving the grinding effect and ensuring the work quality.

[0052] By setting the grinding ball 490 as a spherical detachable structure, the contact area between the grinding ball 490 and the pipe is increased, thereby improving the durability of the grinding ball 490. In addition, by utilizing its detachable feature, the durability of the grinding ball 490 is improved while also improving the convenience of subsequent maintenance.

[0053] For example, Fig.10 and Fig.11 As shown, the traction unit 500 includes a traction outer ring 510, which is a circular ring structure, and the central axis coincides with the central axis of the central through groove 411. A third motor 520 is provided on the top of the traction outer ring 510, and the output end of the third motor 520 extends into the cavity of the traction outer ring 510, and is transmission-connected with a bevel gear 521. A helical gear 530 is provided in the cavity of the traction outer ring 510, and the central axis of the helical gear 530 coincides with the central axis of the traction outer ring 510, and the helical gear 530 is meshingly connected with the bevel gear 521.

[0054] Specifically, a ball bearing seat 540 is rotatably connected to the inner wall of the central through hole of the traction outer ring 510, and the inner wall of the bevel gear 530 is connected to the outer wall of the ball bearing seat 540. A traction inner ring 550 is installed on the inner wall of the ball bearing seat 540, and a plurality of groups of third electric push rods 560 are distributed in a circular array in the cavity of the traction inner ring 550. The output end of the third electric push rod 560 extends into the central through hole of the traction inner ring 550 and is installed with a pipe clamping plate 570.

[0055] Specifically, the bottom of the traction outer ring 510 is transmission-connected with an electric slide 501 , and the electric slide 501 horizontally extends from a side close to the grinding unit 400 to a side away from the grinding unit 400 .

[0056] When the polished end of the pipe gradually extends out from the middle through groove 411, it is placed in the inner traction ring 550, and each group of third electric push rods 560 controls each group of pipe clamps 570 to fix the pipe, and then the electric slide 501 is started to drive the pipe to gradually move to the side away from the lower feeding unit 200. When the pipe is polished, both ends of the pipe have a conveying mechanism, which further improves the stability during polishing, and when the polishing is finished, the edge of the tail will not be unable to be conveyed because it is separated from the lower feeding unit 200, so that all parts of the pipe surface can be polished without manual pulling, which improves the polishing stability and makes the polishing work more thorough, and also improves the automation of the equipment.

[0057] The above embodiments have the following beneficial effects:

[0058] 1. By setting a spiral scraper 470 with a spiral structure and arranging each group of grinding sand balls 490 at equal intervals along its spiral path, when the pipe is moving and rotating and rolling with each group of grinding sand balls 49, the traditional spiral grinding marks will be offset. In addition, each group of grinding sand balls 490 contacts the pipe from different directions at the same time, thus avoiding grinding dead corners, improving the grinding effect and ensuring the work quality.

[0059] 2. By adding several groups of upper feeding mechanisms 360, and in cooperation with each group of lower feeding mechanisms 240, the upper feeding mechanisms 360 act on the surface of the pipe from different directions at the same time, thereby improving the stability of the pipe during transportation and grinding, and preventing the pipe from being offset due to insufficient straightness of the pipe or vibration during grinding. In addition, the upper feeding mechanisms 360 are adjustable, and the height of each group of upper feeding mechanisms 360 can be adjusted according to the diameter of the pipe, thereby improving the stability of the pipe and the compatibility of the equipment.

[0060] 3. Fix one end of the pipe after grinding through each group of pipe 570 clamps, and then drive the pipe to gradually move to the side away from the lower feeding unit 200 through the electric slide 501. When grinding the pipe, both ends have a mechanism for transportation, which further improves the stability during grinding, and when grinding is finished, the edge of the tail will not be unable to be transported because it is separated from the lower feeding unit 200, so that all parts of the pipe surface can be ground without manual pulling, which improves the grinding stability, makes the grinding work more thorough, and also improves the automation of the equipment.

[0061] 4. By setting the grinding sand ball 490 as a spherical detachable structure, the contact area between the grinding sand ball 490 and the pipe is increased, thereby improving the durability of the grinding sand ball 490. In addition, by utilizing its detachable characteristics, the durability of the grinding sand ball 490 is improved while also improving the convenience of subsequent maintenance.

[0062] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plastic pipe surface polishing device, comprising a polishing table (100), wherein a lower feeding unit (200) is provided on the top of the polishing table (100), characterized in that: A grinding unit (400) is provided on the output end of the lower feeding unit (200); The grinding unit (400) comprises a grinding outer ring (410), a central through groove (411) is provided at the center of the grinding outer ring (410), and a crescent fixed plate (420) is provided on one side wall of the central through groove (411); a second electric push rod (430) is provided on the inner wall of the grinding outer ring (410) away from the crescent fixed plate (420), the output end of the second electric push rod (430) extends into the central through groove (411) and is installed with a crescent movable plate (440); the crescent fixed plate (420) and the crescent movable plate (440) are combined to form a cylindrical grinding component; spiral scrapers (470) are spirally distributed on the inner wall of the cylindrical grinding component, and a plurality of groups of grinding sand balls (490) are arranged at equal intervals on the spiral scrapers (470); The lower feeding unit (200) drives the pipe to rotate while conveying the pipe, and a plurality of groups of grinding sand balls (490) distributed along a spiral path sequentially slide and rub against the surface of the pipe to grind it, thereby offsetting the spiral lines caused by the traditional grinding wheel.

2. The plastic pipe surface polishing device according to claim 1, characterized in that: The lower feeding unit (200) comprises a lower feeding platform (210), the direction of the lower feeding platform (210) being the same as that of the grinding platform (100), and a lower feeding pipe groove (211) with both ends open is provided on the top of the lower feeding platform (210) along its own length direction; a lower transmission component (221) is provided at an end of the lower feeding platform (210) away from the grinding unit (400), and a first motor (220) is connected to the input end of the lower transmission component (221) for transmission.

3. The plastic pipe surface polishing device according to claim 2, characterized in that: The output end of the lower transmission component (221) is connected to two groups of first rotating rods (230) for transmission. The two groups of first rotating rods (230) are symmetrically arranged at the top two side edges of the lower feeding pipe groove (211) in the horizontal direction; and a plurality of groups of lower feeding mechanisms (240) are arranged at equal intervals on each group of the first rotating rods (230).

4. The plastic pipe surface polishing device according to claim 3, characterized in that: The lower feeding mechanism (240) includes a feeding sleeve roller (241), the feeding sleeve roller (241) is sleeved on a corresponding group of first rotating rods (230), and a spiral feeding groove (242) is spirally distributed on the side wall of the feeding sleeve roller (241); a central annular groove (243) is opened at the center of the outer wall of the feeding sleeve roller (241), and a plurality of groups of scraping strips (244) are distributed in a circular array in the central annular groove (243); and a plurality of groups of scraping openings (245) are arranged at equal intervals on a side wall of the scraping strip (244) away from the central axis of the central annular groove (243).

5. The plastic pipe surface polishing device according to claim 1, characterized in that: An upper feeding unit (300) is provided just above the lower feeding unit (200) and is lifted and lowered. The upper feeding unit (300) has the same structure as the lower feeding unit (200) and is symmetrically arranged with respect to each other.

6. The plastic pipe surface polishing device according to claim 5, characterized in that: Two groups of dust collecting inner rings (450) are symmetrically arranged on both sides of the second electric push rod (430), the central axis of the dust collecting inner ring (450) coincides with the central axis of the central through groove (411), and a plurality of groups of speaker channels (460) are evenly distributed on the inner wall of the dust collecting inner ring (450), the other end of the speaker channel (460) extends into the central through groove (411), and the inner diameter of the speaker channel (460) at one end close to the dust collecting inner ring (450) is smaller than the inner diameter of the other end.

7. The plastic pipe surface polishing device according to claim 1, characterized in that: A traction unit (500) is provided on a side of the grinding unit (400) away from the lower feeding unit (200). The traction unit (500) comprises a traction outer ring (510). The traction outer ring (510) is a circular ring structure, and the central axis thereof coincides with the central axis of the central through groove (411).

8. The plastic pipe surface polishing device according to claim 7, characterized in that: A third motor (520) is provided on the top of the traction outer ring (510), and an output end of the third motor (520) extends into the cavity of the traction outer ring (510) and is transmission-connected to a bevel gear (521); a helical gear (530) is provided in the cavity of the traction outer ring (510), a central axis of the helical gear (530) coincides with the central axis of the traction outer ring (510), and the helical gear (530) is meshedly connected to the bevel gear (521).

9. The plastic pipe surface polishing device according to claim 8, characterized in that: A ball bearing seat (540) is rotatably connected to the inner wall of the central through hole of the traction outer ring (510), and the inner wall of the bevel gear (530) is connected to the outer wall of the ball bearing seat (540); a traction inner ring (550) is installed on the inner wall of the ball bearing seat (540), and a plurality of groups of third electric push rods (560) are distributed in a circular array in the cavity of the traction inner ring (550), and the output end of the third electric push rod (560) extends into the central through hole of the traction inner ring (550) and is installed with a pipe clamp (570).

10. The plastic pipe surface polishing device according to claim 7, characterized in that: The bottom of the traction outer ring (510) is transmission-connected to an electric slide (501), and the electric slide (501) extends horizontally from a side close to the grinding unit (400) to a side away from the grinding unit (400).

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