Full-automatic online circumferential wall thickness detection device for polyolefin pipe

Abstract

The utility model discloses a polyolefin pipe full-automatic on-line circumferential wall thickness detection device, which comprises a rack, a water tank assembly, a rotating mechanism and an ultrasonic detection mechanism, the water tank assembly comprises a water tank body, the water tank body is arranged on the rack, the rotating mechanism and the ultrasonic detection mechanism are positioned in the water tank body, a fixed part of the rotating mechanism is arranged in the water tank, and a fixed part of the ultrasonic detection mechanism is arranged in the water tank. The ultrasonic detection mechanism comprises an ultrasonic wall thickness detector, the ultrasonic wall thickness detector is provided with a center hole allowing the polyolefin pipe to penetrate through and four ultrasonic probes, the four ultrasonic probes are evenly distributed on the periphery of the center hole in the circumferential direction, and the ultrasonic wall thickness detector is rotationally connected with the fixed part of the rotating mechanism; and the rotating part of the rotating mechanism can drive the ultrasonic wall thickness detector to rotate by 90 degrees around the axis of the central hole in a reciprocating manner. The device is simple in structure and ingenious in design, the wall thickness of the polyolefin pipe can be detected in real time in the 360-degree direction in the circumferential direction, the detection efficiency is high, the accuracy is good, and the risk of missing detection is completely eradicated.

Description

Technical Field

[0001] The utility model belongs to the technical field of polyolefin pipe detection, and particularly relates to a full-automatic on-line circumferential wall thickness detection device for polyolefin pipes. Background Technique

[0002] Polyolefin pipes are plastic pipes produced by extrusion die from a class of thermoplastic resins obtained by homopolymerization or copolymerization of α-olefins such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene and certain cycloolefins. The floor heating pipe is a kind of polyolefin pipe. The floor heating pipe refers to a pipe used as a carrier for low-temperature hot water circulation in a low-temperature hot water floor radiant heating system (referred to as floor heating for short). The floor heating pipe is mainly processed and produced from heat-resistant polyethylene (PE-RT) material for cold and hot water. There is a national standard for the products of heat-resistant polyethylene (PE-RT) pipes for cold and hot water: "GB / T 28799.2-2020 Heat-resistant polyethylene (PE-RT) pipe systems for cold and hot water - Part 2: Pipes". Among them, the 7th part of the standard has clear and strict dimensional control requirements for the wall thickness of the pipes, and there should be no defects such as dents, pinholes, and stripes on the pipes. The uniformity of the wall thickness of the heat-resistant polyethylene (PE-RT) pipes for cold and hot water determines the quality consistency of the floor heating pipe products. Therefore, it is necessary to monitor the wall thickness of polyolefin pipes in real time. When there is a problem with the wall thickness of polyolefin pipes, it indicates that there is a problem with the production process of polyolefin pipes, and it is necessary to check in time to avoid adverse effects on the product quality of polyolefin pipes.

[0003] At present, the wall thickness detection and measurement methods for continuously extruded polyolefin pipes are very traditional, relying on manual truncation sampling for detection or air pressure detection of the whole coil of pipes. These two methods are inefficient and there is a risk of missed detection. And the existing fixed-position ultrasonic detection can only be limited to the position of the ultrasonic probe point for detection, and cannot detect the circumferential direction of the pipe, and there is also a risk of missed detection. Content of the Utility Model

[0004] In order to solve the above problems existing in the prior art, the utility model provides a full-automatic on-line circumferential wall thickness detection device for polyolefin pipes. The device has a simple structure and ingenious design, and can realize real-time detection of the wall thickness of polyolefin pipes in the circumferential direction of 360 degrees. The detection efficiency is high, the accuracy is good, and the risk of missed detection is eliminated.

[0005] The technical solution adopted to achieve the above object of the utility model is as follows:

[0006] An automatic on-line circumferential wall thickness detection device for polyolefin pipes, comprising a frame, a water tank assembly, a rotating mechanism and an ultrasonic detector. The water tank assembly includes a water tank body, which is installed on the frame. The rotating mechanism and the ultrasonic detection mechanism are located inside the water tank body. The fixed part of the rotating mechanism is installed inside the water tank. The ultrasonic detection mechanism includes an ultrasonic wall thickness detector, which has a central hole for the polyolefin pipe to pass through and four ultrasonic probes. The four ultrasonic probes are evenly distributed around the central hole in the circumferential direction, and the distances from the four ultrasonic probes to the axis of the central hole are the same. The ultrasonic wall thickness detector is fixedly connected to the rotating part of the rotating mechanism, and the rotating part of the rotating mechanism can drive the ultrasonic wall thickness detector to rotate reciprocally 90 degrees around the axis of its central hole.

[0007] The rotating mechanism described above includes a motor bracket, a rotating motor and a planar link mechanism. The motor bracket is installed on the bottom of the water tank body, the rotating motor is installed on the motor bracket, one end of the link mechanism is fixed to the output shaft of the rotating motor, and the other end of the link mechanism is fixedly installed on the ultrasonic wall thickness detector. Every time the rotating motor rotates 360 degrees, the ultrasonic wall thickness detector rotates reciprocally 90 degrees around the axis of its central hole.

[0008] The ultrasonic detection mechanism described above further includes a support rotating pipe for the polyolefin pipe to pass through. The support rotating pipe is installed on the motor bracket and is rotatably connected to the motor bracket. The ultrasonic wall thickness detector is fixedly installed at one end of the support rotating pipe, and the other end of the link mechanism is fixedly connected to the support rotating pipe.

[0009] The planar link mechanism described above includes a first link, a second link and a third link. The output shaft of the rotating motor is located directly above the support rotating pipe. One end of the first link is fixedly sleeved on the output shaft of the rotating motor. The upper end of the second link is hinged to the other end of the first link, the lower end of the second link is hinged to one end of the third link, and the other end of the third link is fixedly sleeved on the support rotating pipe.

[0010] The rotating support pipe is installed on the motor bracket through two bearing seats.

[0011] The motor bracket described above includes a support cross plate and a support vertical plate. The support cross plate is fixed to the bottom of the water tank body, the bottom of the support vertical plate is fixed to the support cross plate, the rotating motor is installed on the top of the support vertical plate, the support rotating pipe movably penetrates through the lower part of the support vertical plate, and the two bearing seats are respectively located on both sides of the support vertical plate.

[0012] The ultrasonic detection mechanism described above further includes an axis adjustment assembly, which is installed at one end of the support rotating pipe, and the ultrasonic wall thickness detector is installed on the axis adjustment assembly. The axis adjustment assembly can make the central hole of the ultrasonic wall thickness detector coaxial with the floor heating.

[0013] The described axis adjustment assembly includes a flange, a compression bolt, an outer sleeve, and a connection plate. The inner hole of the outer sleeve is stepped. The connection plate is fixedly sealed on the large port of the outer sleeve. The pipe body of the flange movably passes through the small hole of the outer sleeve. The disc body of the flange is located between the connection plate and the hole shoulder of the outer sleeve. There is an adjustment space reserved between the disc body of the flange and the inner wall of the large hole of the outer sleeve. The disc body of the flange can move radially within the large hole of the outer sleeve. The disc body of the flange is fixed to the hole shoulder of the outer sleeve by a compression bolt. One end of the support rotating pipe is threadedly connected to the center of the connection plate, and the support rotating pipe communicates with the outer sleeve. The ultrasonic detection mechanism further includes an ultrasonic bracket. The ultrasonic bracket is fixed to the disc body of the flange, and the ultrasonic wall thickness detector is installed on the ultrasonic bracket.

[0014] The described water tank assembly further includes a water inlet pipe and two drain pipes. Two partition plates are symmetrically arranged inside the water tank body. The water tank body is divided into two drainage cavities and a water storage cavity by the partition plates. The two drainage cavities are symmetrically distributed on both sides of the water storage cavity. The water outlet end of the water inlet pipe is connected to the bottom of the water storage cavity. The inlet ends of the two drain pipes are respectively connected to the bottoms of the two drainage cavities. Through holes for polyolefin pipes to pass through are respectively provided on the two partition plates.

[0015] The described water tank assembly further includes a liquid level control pipe. The liquid level control pipe penetrates through the bottom of the water storage cavity. The height of the inlet of the liquid level control pipe is lower than the height of the bottom of the rotating motor.

[0016] Compared with the prior art, the advantages and beneficial effects of the present utility model are as follows:

[0017] 1. Four ultrasonic probes are arranged around the circumference of the polyolefin pipe at equal intervals. At the same time, the device drives the four ultrasonic probes to rotate 90 degrees around the axis of the polyolefin pipe while detecting. The four ultrasonic probes rotate 90 degrees simultaneously, realizing a 360-degree full-range detection of the wall thickness of the polyolefin pipe. At the same time, the device can drive the four ultrasonic probes to rotate back and forth 90 degrees around the axis of the polyolefin pipe. By rotating the four ultrasonic probes back and forth 90 degrees, real-time detection of the circumferential wall thickness of the polyolefin pipe is achieved. It can be seen that the device has high detection efficiency and high accuracy, and solves the problem of missed detection.

[0018] 2. The device has a simple structure, ingenious design, is easy to process and manufacture, has a low cost, strong practicability, and can be widely promoted and applied on a large scale. Description of the Drawings

[0019] Figure 1 It is a three-dimensional view of the full-automatic on-line circumferential wall thickness detection device for polyolefin pipes.

[0020] Figure 2 It is a three-dimensional view of the full-automatic on-line circumferential wall thickness detection device for polyolefin pipes (at a different Figure 1 angle).

[0021] Figure 3 is Figure 1 the top view of

[0022] Figure 4 is the schematic internal structure diagram of the full-automatic on-line circumferential wall thickness detection device for polyolefin pipes.

[0023] Figure 5 is Figure 3 the sectional view taken along the A-A direction.

[0024] Figure 6 is Figure 5 the partial enlarged view of I in

[0025] Figure 7 is the assembly drawing of the rotating mechanism and the ultrasonic detection mechanism.

[0026] Figure 8 is Figure 1 the schematic structure diagram of J in

[0027] Figure 9 is the assembly drawing of the rotating mechanism and the support rotating pipe.

[0028] Among them, 1 - workbench, 2 - support bottom frame, 3 - column, 4 - foot body, 5 - adjusting screw, 6 - water tank body, 7 - water inlet pipe, 8 - liquid level control pipe, 9 - drain pipe, 10 - partition board, 11 - drainage cavity, 12 - water storage cavity, 13 - rotating motor, 14 - support cross plate, 15 - support vertical plate, 16 - first connecting rod, 17 - second connecting rod, 18 - third connecting rod, 19 - support rotating pipe, 20 - ultrasonic wall thickness detector, 21 - ultrasonic probe, 22 - ultrasonic support, 23 - bearing seat, 24 - flange plate, 25 - outer sleeve, 26 - connecting plate, 27 - adjusting space, 28 - polyolefin pipe, 29 - ear plate. Specific embodiments

[0029] The following combines the drawings to elaborate in detail on the push-button quick-opening ball valve type angle valve of the present utility model.

[0030] Embodiment 1

[0031] The structure schematic diagram of the full-automatic on-line circumferential wall thickness detection device for polyolefin pipes provided in this embodiment is as shown in Figures 1-4 and includes a frame, a water tank assembly, a rotating mechanism, an ultrasonic detection mechanism and a controller.

[0032] As shown in Figure 2As shown in the figure, the frame includes a workbench 1, a supporting bottom frame 2, four columns 3 and four feet. Both the supporting bottom frame 2 and the workbench 1 are square. The upper ends of the four columns 3 are respectively connected to the four corners of the workbench 1, and the lower ends of the four columns 3 are respectively connected to the four corners of the supporting bottom frame 2. Four square-distributed ear plates 29 are respectively provided at the four corners of the supporting bottom frame 2, where two ear plates 29 are located outside the two ends of a cross beam in the length direction of the supporting bottom frame 2, and the other two ear plates 29 are located outside the two ends of the other cross beam in the length direction of the supporting bottom frame 2. The feet include a foot body 4 and an adjusting screw 5, and the lower end of the adjusting screw 5 is fixed on the foot body 4. Threaded holes are respectively provided on the four ear plates 29, and the four adjusting screws 5 are respectively threadedly connected to the four ear plates, and the height of the workbench 1 is adjusted by adjusting the height of the ear plates 29.

[0033] As Figure 1 , Figure 2 and Figure 3 shown in the figure, the water tank assembly includes a water tank body 6, a water inlet pipe 7, a liquid level control pipe 8 and two drain pipes 9. The water tank body 6 is quasi-square. The bottom of the water tank body 6 is fixed on the workbench 1, and two perforations for the polyolefin pipe 28 to pass through are symmetrically provided on the two side plates in the width direction of the water tank body 6. Two partition plates 10 are symmetrically provided in the water tank body 6, and perforations for the polyolefin pipe 28 to pass through are respectively provided on the two partition plates 10. The water tank body 6 is separated into two drainage cavities 11 and a water storage cavity 12 by the partition plates. The two drainage cavities 11 are symmetrically distributed on both sides of the water storage cavity 12, and the two water storage cavities 12 and the drainage cavities 11 are distributed along the length direction of the water tank body 6.

[0034] As Figure 4 shown in the figure, the water outlet end of the water inlet pipe 7 passes through the workbench 1 and is connected to the bottom of the water storage cavity 12, and the inlet ends of the two drain pipes 9 respectively pass through the workbench 1 and are connected to the bottoms of the two drainage cavities 11. Since the polyolefin pipe 28 keeps moving forward under the action of the tractor, there is a gap between the polyolefin pipe 28 and the partition plate 10, and the water in the water storage cavity 12 will flow into the drainage cavity 11 through this gap and then be discharged through the drain pipe 9. The liquid level control pipe 8 penetrates through the workbench 1 and the bottom of the water storage cavity 12, and the height of the inlet of the liquid level control pipe 8 is lower than the height of the bottom of the rotating motor 13. By setting the liquid level control pipe 8, the water level in the water storage cavity 12 is always lower than the bottom of the rotating motor 13, preventing water from entering the rotating motor 13 and causing damage to the rotating motor 13.

[0035] As Figure 8As shown in the figure, the rotating mechanism is located inside the water storage chamber 12. The rotating mechanism includes a motor support, a rotating motor 13, and a planar link mechanism. The motor support includes a supporting horizontal plate 14 and a supporting vertical plate 15. The supporting vertical plate 15 is parallel to the partition plate 10. The supporting horizontal plate 14 is fixed to the bottom of the water storage chamber 12, and the bottom of the supporting vertical plate 15 is fixed at a position near the middle on one side of the supporting horizontal plate 14. The fixing seat of the rotating motor 13 is fixed to the top of the supporting vertical plate 15, and the output shaft of the rotating motor 13 movably penetrates through the supporting vertical plate 15.

[0036] As Figure 6 and Figure 7 As shown in the figure, the ultrasonic detection mechanism includes a supporting rotating tube 19 through which the polyolefin pipe 28 passes, an ultrasonic wall thickness detector 20, an axis adjustment component, and an ultrasonic support 22. The ultrasonic wall thickness detector 20 has a central hole through which the polyolefin pipe passes and four ultrasonic probes 21. The four ultrasonic probes 21 are evenly distributed around the central hole in the circumferential direction, and the distances from the four ultrasonic probes 21 to the axis of the central hole are the same. The ultrasonic support 22 is L-shaped, and the ultrasonic wall thickness detector 20 is fixed to the horizontal part of the ultrasonic support 22.

[0037] The supporting rotating tube 19 is installed on the supporting horizontal plate 14 through two bearing seats. The two bearing seats 23 are respectively located on both sides of the supporting vertical plate 15. The axis adjustment component includes a flange plate 24, an outer sleeve 25, a compression bolt, and a connecting plate 26. The inner hole of the outer sleeve 25 is stepped. The connecting plate 26 is disc-shaped and is fixedly sealed to the large port of the outer sleeve 25. The pipe body of the flange plate 24 movably penetrates through the small hole of the outer sleeve 25, and the disc body of the flange plate 24 is located between the connecting plate 26 and the shoulder of the hole of the outer sleeve 25. There is an adjustment space 27 reserved between the disc body of the flange plate 24 and the inner wall of the large hole of the outer sleeve 25. The disc body of the flange plate 24 can move radially in the large hole of the outer sleeve 25, and the disc body of the flange plate 24 is fixed to the shoulder of the hole of the outer sleeve 25 through a compression bolt. One end of the supporting rotating tube 19 is threadedly connected to the center of the connecting plate 26, and the supporting rotating tube 19 is communicated with the outer sleeve 25. The vertical part of the ultrasonic support 22 is provided with a through hole through which the polyolefin pipe 28 passes. The vertical part of the ultrasonic support 22 is fixed to the disc body of the flange plate 24. The through hole on the ultrasonic support 22, the central hole of the ultrasonic wall thickness detector 29, and the central hole of the flange plate 24 are coaxial. When the central hole of the ultrasonic wall thickness detector 20 is not coaxial with the polyolefin pipe 28, the compression bolt can be loosened first, and then the flange plate 24 can be adjusted to a suitable position so that the central hole of the ultrasonic wall thickness detector 20 is coaxial with the polyolefin pipe 28.

[0038] As shown in Figure 9, the planar link mechanism and the axis adjustment component are respectively located on both sides of the supporting vertical plate 15 and one of the bearing seats 23. The output shaft of the rotating motor 13 is located directly above the supporting rotating tube 19, and the output shaft of the rotating motor 13 faces away from the axis adjustment component. As Figure 8As shown, the planar linkage mechanism includes a first link 16, a second link 17, and a third link 18. The lengths of the first link 16 and the third link 18 are less than the length of the second link 17. One end of the first link 16 is fixedly sleeved on the output shaft of the rotary motor 13. The upper end of the second link 17 is hinged to the other end of the first link 16. The lower end of the second link 17 is hinged to one end of the third link 18. The other end of the third link 18 is fixedly sleeved on the support rotary tube 19.

[0039] When the rotary motor 13 starts to rotate counterclockwise (it can also be set to rotate clockwise), the rotary motor 13 drives the first link 16 to rotate. The first link 16 drives the second link 17 to rotate. The second link 17 drives the third link 18 to rotate. Since the support rotary tube 19 is connected to the bearing seat 23 fixed on the support cross plate 14, the third link 18 drives the support rotary tube 19 to rotate. Moreover, the support rotary tube 19 is fixedly connected to the axis adjustment assembly. The axis adjustment assembly is fixedly connected to the ultrasonic bracket 22. The ultrasonic bracket 22 is fixedly connected to the ultrasonic wall thickness detector 20. The support rotary tube 19 drives the ultrasonic wall thickness detector 20 to rotate, so that the four ultrasonic probes 21 on the ultrasonic wall thickness detector 20 rotate. When the rotary motor 13 rotates counterclockwise by 180 degrees, the four ultrasonic probes 21 on the ultrasonic wall thickness detector 20 rotate counterclockwise (it can also be set to rotate clockwise) by 90 degrees. Subsequently, the rotary motor 13 continues to rotate counterclockwise, and the four ultrasonic probes 21 on the ultrasonic wall thickness detector 20 rotate clockwise. When the rotary motor 13 rotates counterclockwise by 360 degrees (i.e., returns to the initial position), the four ultrasonic probes 21 on the ultrasonic wall thickness detector 20 rotate clockwise by 90 degrees and return to the initial position.

[0040] This device is arranged after the cooling sizing equipment. After the polyolefin pipe 28 is cooled and sized, it moves forward under the action of the tractor. When it is necessary to detect the wall thickness of the polyolefin pipe 28 entering the device, the rotary motor 13 and the ultrasonic wall thickness detector 20 are turned on. The four ultrasonic probes 21 on the ultrasonic wall thickness detector 20 continuously rotate back and forth by 90 degrees to perform real-time detection on the circumferential wall thickness of the polyolefin pipe 28. Every time the four ultrasonic probes 21 rotate by 90 degrees, the four ultrasonic probes 21 detect the wall thickness of the polyolefin pipe 28 circumferentially once to obtain the circumferential wall thickness of the polyolefin pipe 28. The circumferential wall thickness of the polyolefin pipe 28 is a range value. Set the wall thickness range threshold specified by the national standard of the polyolefin pipe on the controller. When the measured circumferential wall thickness of the polyolefin pipe 28 exceeds the wall thickness range threshold, the controller gives an alarm for prompt.

Claims

1. A fully automatic online circumferential wall thickness detection device for polyolefin pipes, characterized in that: It includes a frame, a water tank assembly, a rotating mechanism and an ultrasonic detection machine. The water tank assembly includes a water tank body, which is installed on the frame. The rotating mechanism and the ultrasonic detection mechanism are located in the water tank body. The fixed part of the rotating mechanism is installed in the water tank. The ultrasonic detection mechanism includes an ultrasonic wall thickness detector. The ultrasonic wall thickness detector has a center hole for the polyolefin pipe to pass through and four ultrasonic probes. The four ultrasonic probes are evenly distributed on the periphery of the center hole in a circumferential direction, and the distances from the four ultrasonic probes to the axis of the center hole are the same. The ultrasonic wall thickness detector is fixedly connected to the rotating part of the rotating mechanism. The rotating part of the rotating mechanism can drive the ultrasonic wall thickness detector to reciprocate 90 degrees around the axis of its center hole.

2. The fully automatic online circumferential wall thickness detection device for polyolefin pipes according to claim 1 is characterized in that: The rotating mechanism includes a motor bracket, a rotating motor and a planar connecting rod mechanism. The motor bracket is installed on the bottom of the water tank body, the rotating motor is installed on the motor bracket, one end of the connecting rod mechanism is fixed on the output shaft of the rotating motor, and the other end of the connecting rod mechanism is fixedly installed on the ultrasonic wall thickness detector. Every time the rotating motor rotates 360 degrees, the ultrasonic wall thickness detector reciprocates 90 degrees around the axis of its center hole.

3. The fully automatic online circumferential wall thickness detection device for polyolefin pipes according to claim 2 is characterized in that: The ultrasonic detection mechanism also includes a supporting rotating tube for the polyolefin pipe to pass through, the supporting rotating tube is installed on the motor bracket, and the supporting rotating tube is rotatably connected to the motor bracket. The ultrasonic wall thickness detector is fixedly installed on one end of the supporting rotating tube, and the other end of the connecting rod mechanism is fixed to the supporting rotating tube.

4. The fully automatic online circumferential wall thickness detection device for polyolefin pipes according to claim 3 is characterized in that: The planar connecting rod mechanism includes a first connecting rod, a second connecting rod and a third connecting rod. The output shaft of the rotating motor is located directly above the supporting rotating tube. One end of the first connecting rod is fixedly sleeved on the output shaft of the rotating motor. The upper end of the second connecting rod is hinged to the other end of the first connecting rod. The lower end of the second connecting rod is hinged to one end of the third connecting rod. The other end of the third connecting rod is fixedly sleeved on the supporting rotating tube.

5. The fully automatic online circumferential wall thickness detection device for polyolefin pipes according to claim 3 is characterized in that: The rotating support tube is installed on the motor bracket through two bearing seats.

6. The fully automatic online circumferential wall thickness detection device for polyolefin pipes according to claim 5 is characterized in that: The motor bracket includes a supporting horizontal plate and a supporting vertical plate. The supporting horizontal plate is fixed on the bottom of the water tank body, the bottom of the supporting vertical plate is fixed on the supporting horizontal plate, the rotating motor is installed on the top of the supporting vertical plate, the supporting rotating tube movably passes through the lower part of the supporting vertical plate, and the two bearing seats are respectively located on both sides of the supporting vertical plate.

7. The fully automatic online circumferential wall thickness detection device for polyolefin pipes according to claim 3 is characterized by: The ultrasonic detection mechanism also includes an axis adjustment component, which is installed on one end of the supporting rotating tube. The ultrasonic wall thickness detector is installed on the axis adjustment component. The axis adjustment component can make the center hole of the ultrasonic wall thickness detector coaxial with the floor heating.

8. The fully automatic online circumferential wall thickness detection device for polyolefin pipes according to claim 7, characterized in that: The axis adjustment assembly includes a flange, a clamping bolt, an outer sleeve and a connecting plate. The inner hole of the outer sleeve is step-shaped. The connecting plate is fixedly sealed on the large port of the outer sleeve. The tube body of the flange movably passes through the small hole of the outer sleeve. The body of the flange is located between the connecting plate and the shoulder of the outer sleeve. An adjustment space is reserved between the body of the flange and the inner wall of the large hole of the outer sleeve. The body of the flange can move radially in the large hole of the outer sleeve. The body of the flange is fixed to the shoulder of the hole of the outer sleeve by a clamping bolt. One end of the supporting rotating tube is threadedly connected to the center of the connecting plate, and the supporting rotating tube is connected to the outer sleeve. The ultrasonic detection mechanism also includes an ultrasonic bracket, which is fixed on the body of the flange, and an ultrasonic wall thickness detector is installed on the ultrasonic bracket.

9. The fully automatic online circumferential wall thickness detection device for polyolefin pipes according to claim 1, characterized in that: The water tank assembly also includes a water inlet pipe and two drain pipes. Two partitions are symmetrically arranged in the water tank body. The water tank body is divided into two drain chambers and a water storage chamber by the partitions. The two drain chambers are symmetrically distributed on both sides of the water storage chamber. The water outlet end of the water inlet pipe is connected to the bottom of the water storage chamber, and the inlet ends of the two drain pipes are respectively connected to the bottom of the two drain chambers. The two partitions are respectively provided with perforations for polyolefin pipes to pass through.

10. The fully automatic online circumferential wall thickness detection device for polyolefin pipes according to claim 9, characterized in that: The water tank assembly also includes a liquid level control pipe, which runs through the bottom of the water storage cavity, and the height of the liquid level control pipe inlet is lower than the height of the bottom of the rotating motor.

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