TPU pipe inner diameter and outer diameter detection device

Abstract

The application relates to the technical field of laser detection, in particular to a TPU pipe inner diameter and outer diameter detection device, which comprises a workbench, two groups of laser distance sensors A, a laser distance sensor B, the top end of the workbench is provided with a base, the surface of the base is provided with a clamping assembly for positioning a pipe fitting, the top end of the workbench is provided with a supporting rod, the two sides of the supporting rod are provided with electric push rods, the output ends of the electric push rods are provided with mounting plates, airflow enters the annular pipe arranged on the outer wall of the laser distance sensor A, flows into the jet ring through the communication channel of the jet ring communicated with one end of the annular pipe, is evenly sprayed from the jet holes, a continuous and stable annular air curtain is formed outside the laser distance sensor A, the detection error caused by environmental interference is reduced, and the precision and reliability of the TPU pipe inner diameter and outer diameter detection data are improved.

Description

Technical Field

[0001] This invention relates to the field of laser inspection technology, and in particular to a device for detecting the inner and outer diameters of TPU pipes. Background Technology

[0002] In the manufacturing process of TPU tubing, the dimensional accuracy of the inner and outer diameters directly determines its suitability for subsequent use and the product quality level. Especially in fields with strict requirements for dimensional tolerances, such as medical delivery, precision fluid transmission, and electronic packaging, deviations in the inner and outer diameters may lead to serious problems such as pipeline connection leaks, reduced fluid delivery efficiency, or even equipment failure.

[0003] Commercially available testing devices based on the principle of laser ranging typically use laser ranging sensors to obtain the distance data between the pipe surface and the sensor by using the principle of laser signal reflection. Then, combined with preset benchmark parameters, the inner and outer diameters of the pipe are calculated, which improves the testing efficiency and accuracy to a certain extent.

[0004] However, in the testing environment, there are usually plastic debris, dust and other impurities suspended in the air. These impurities can easily adhere to the inner and outer walls of TPU pipes or invade the optical detection module of the testing device, causing the optical signal transmission to be obstructed or distorted, which in turn leads to deviations in the test data.

[0005] In view of this, this paper studies and improves upon existing problems, and provides a device for detecting the inner and outer diameters of TPU pipes. The aim of this technology is to solve the problems and improve its practical value. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and to propose a device for detecting the inner and outer diameters of TPU pipes.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a TPU pipe inner and outer diameter detection device, including a worktable, two sets of laser ranging sensors A and laser ranging sensors B, a base is installed on the top of the worktable, a clamping assembly for positioning pipes is provided on the surface of the base, a support rod is installed on the top of the worktable, electric push rods are installed on both sides of the support rod, and an installation plate is installed on the output end of the electric push rod;

[0008] The surface of the mounting plate is provided with an inflation mechanism, which includes a cylinder fixedly installed at the top of the mounting plate. The bottom end of the cylinder is provided with a downward pressure rod via a bearing. A sealing plate is installed at the bottom end of the downward pressure rod. An air cushion for enhancing the sealing performance is sleeved on the outer wall of the sealing plate. A fan blade is fixedly installed at the top end of the downward pressure rod. An air supply pipe A is connected to the side wall of the cylinder.

[0009] The bottom of the laser rangefinder A is provided with a cleaning mechanism. The cleaning mechanism includes an annular plate installed on the side wall of the laser rangefinder A. The bottom of the annular plate is connected to an L-shaped rod. An inner plate is installed at one end of the L-shaped rod. A scraper for scraping off impurities is slidably provided inside the inner plate. A connecting pipe is connected between the inner cavity of the pressing rod and the inner cavity of the annular plate.

[0010] A detection mechanism is provided on one side of the built-in plate;

[0011] Both sets of laser rangefinder sensors A have an air curtain mechanism on their surfaces.

[0012] Preferably, the clamping assembly includes a cylinder mounted on the surface of the base, and a clamping block is mounted on the telescopic end of the cylinder, the clamping block being arranged in an arc shape.

[0013] Preferably, a fixing rod is sleeved on the outer wall of the pressure rod, the laser rangefinder A is installed at both ends of the fixing rod, and the laser rangefinder B is installed on the outer wall of the pressure rod.

[0014] Preferably, a fan is installed on the side wall of the electric push rod, and the output end of the fan is connected to one end of the air supply pipe A.

[0015] Preferably, the scraper is made of rubber material, and a pressure sensor is installed at the top of the base.

[0016] Preferably, the detection mechanism includes a sealing ring rotatably mounted on the inner wall of the base, a sphere communicating with the inner cavity of the base is installed on the side wall of the sealing ring, a spring rod is installed on the inner wall of the sphere, a sealing ball for sealing the sphere is installed at one end of the spring rod, a horizontal tube communicating with the sphere is installed on the surface of the L-shaped rod, a squeezing rod is slidably installed inside the horizontal tube by a spring, one end of the squeezing rod is fixedly connected to the side wall of the scraper, and a gas supply pipe B communicates between the sphere and the horizontal tube.

[0017] Preferably, a limit block is installed on the side wall of the annular plate, a connecting rod is fixedly connected to the outer wall of the sealing ring, and the annular plate slides along the outer wall of the connecting rod.

[0018] Preferably, the air curtain mechanism includes an annular tube installed on the outer wall of the laser rangefinder A, one end of the annular tube is connected to an air jet ring, one end of the air jet ring is provided with air jet holes evenly distributed along its axis, and an air supply pipe C is connected between the built-in plate and the annular tube.

[0019] Preferably, the outer wall of the sealing plate has multiple sets of vent holes, which are arranged in a ring array along the axis of the sealing plate, and the spacing between adjacent sets of vent holes is equal.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This invention uses an electric push rod to simultaneously move a downward pressure rod. The downward pressure rod then moves the sealing plate continuously downward along the inside of the sealed pipe. As the sealing plate moves downward, the volume of the enclosed space inside the pipe gradually decreases. According to the relationship between gas pressure and volume, the internal air pressure continuously increases. Workers can track the air pressure changes in real time through pressure sensors installed on the base surface. This allows for the simulation of different air pressure environments to test the airtightness of the pipe. If the air pressure rises steadily as the sealing plate moves downward and remains stable after it stops moving downward, the pipe is considered airtight. If the air pressure rises slowly or drops rapidly after it stops moving downward, it indicates that there is a leakage problem in the pipe. Thus, the entire process is carried out simultaneously with laser detection, eliminating the need for a separate airtightness testing procedure, effectively shortening the single testing cycle and improving the efficiency of batch testing.

[0022] 2. This invention uses a scraper that is tightly attached to the outer wall of the TPU pipe. Because the pressure rod is rotating under the drive of the fan blade, the rotation of the pressure rod will synchronously drive the scraper to rotate around the axis of the pipe. By utilizing the friction between the scraper and the outer wall of the pipe, impurities such as residual plastic debris and dust attached to the outer wall are scraped off, thereby achieving simultaneous cleaning of impurities on the inner and outer walls of the pipe. This keeps the inner and outer walls of the pipe clean and flat, providing a clear and interference-free testing environment for laser inspection, reducing the detection error caused by impurities, and further ensuring the accuracy of the inner and outer diameter detection data. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a partial structural schematic diagram of the present invention;

[0025] Figure 3 This is a three-dimensional structural diagram of the inflation mechanism of the present invention;

[0026] Figure 4 This is a schematic cross-sectional view of the sealing plate structure of the present invention;

[0027] Figure 5 This is a three-dimensional structural diagram of the cleaning mechanism of the present invention;

[0028] Figure 6 For the present invention Figure 5 Enlarged structural diagram of section A;

[0029] Figure 7 This is a schematic diagram of the three-dimensional structure of the jet ring of the present invention;

[0030] Figure 8 This is a three-dimensional structural diagram of the detection mechanism of the present invention;

[0031] Figure 9 For the present invention Figure 8 Enlarged structural diagram of section B.

[0032] Legend:

[0033] 1. Workbench; 2. Base; 3. Electric push rod; 4. Mounting plate; 5. Laser rangefinder A; 6. Laser rangefinder B; 7. Inflation mechanism; 71. Fixing rod; 72. Cylinder; 73. Pressing rod; 74. Sealing plate; 75. Air cushion; 76. Fan blade; 77. Fan; 78. Air supply pipe A; 8. Cleaning mechanism; 81. Annular plate; 82. L-shaped rod; 83. Internal plate; 84. Scraper; 85. Connecting pipe; 9. Detection mechanism; 91. Sealing ring; 92. Ball; 93. Spring rod; 94. Sealing ball; 95. Horizontal tube; 96. Extrusion rod; 97. Air supply pipe B; 10. Air curtain mechanism; 101. Annular tube; 102. Air jet ring; 103. Air jet hole; 104. Air supply pipe C; 11. Cylinder; 12. Clamping block; 13. Support rod; 14. Connecting rod. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] See Figures 1 to 9 As shown, the present invention provides a TPU pipe inner and outer diameter detection device, including a workbench 1, two sets of laser rangefinders A5 and B6, a base 2 installed on the top of the workbench 1, a clamping assembly for positioning pipes provided on the surface of the base 2, a support rod 13 installed on the top of the workbench 1, electric push rods 3 installed on both sides of the support rod 13, and an installation plate 4 installed on the output end of the electric push rod 3.

[0036] The surface of the mounting plate 4 is provided with an inflation mechanism 7. The inflation mechanism 7 includes a cylinder 72 fixedly installed at the top of the mounting plate 4. The bottom end of the cylinder 72 is provided with a downward pressure rod 73 via a bearing. The bottom end of the downward pressure rod 73 is provided with a sealing plate 74. The outer wall of the sealing plate 74 is fitted with an air cushion 75 for enhancing the sealing performance. The top end of the downward pressure rod 73 is fixedly installed with a fan blade 76. The side wall of the cylinder 72 is connected to an air supply pipe A78.

[0037] It should be noted that when TPU tubing needs to be inspected, the operator first places the TPU tubing to be inspected on the base 2, and then activates the cylinder 11 in the clamping assembly. The telescopic end of the cylinder 11 will drive the arc-shaped clamping block 12 to move towards the outer wall of the tubing until the clamping block 12 is tightly attached to the outer wall of the tubing. Through the adaptability of the arc-shaped clamping block 12 to the contour of the tubing, the tubing is accurately and stably positioned on the base 2, avoiding the impact of tubing offset on data accuracy during subsequent inspection.

[0038] After the pipe positioning is completed, the staff starts the electric push rod 3. The output end of the electric push rod 3 drives the mounting plate 4 to move down as a whole. The mounting plate 4 simultaneously drives the laser rangefinder A5 and the laser rangefinder B6 to move down along the outer and inner walls of the pipe, respectively. While the electric push rod 3 moves down, the fan 77 connected to the air supply pipe A78 is started. The compressed air generated by the fan 77 is delivered to the inside of the cylinder 72 fixed at the top of the mounting plate 4 through the air supply pipe A78. Since the lower pressure rod 73 connected to the bottom of the cylinder 72 by the bearing is a hollow structure, the airflow will smoothly enter the sealing plate 74 installed at its bottom through the inner cavity of the lower pressure rod 73. Then the airflow is injected into the air cushion 75 sleeved on the outer wall of the sealing plate 74 through the exhaust hole opened on the outer wall of the sealing plate 74, causing the air cushion 75 to expand continuously. The expanded air cushion 75 is tightly attached to the inner wall of the pipe, thereby achieving a seal inside the pipe.

[0039] As the electric push rod 3 continuously moves the laser rangefinder A5 and laser rangefinder B6 downwards, the electric push rod 3 also simultaneously moves the pressure rod 73. The pressure rod 73 then moves the sealing plate 74 downwards along the sealed pipe. Since the sealing plate 74 and the air cushion 75 have formed a closed space inside the pipe, as the sealing plate 74 moves downwards, the volume of the closed space inside the pipe gradually decreases. According to the relationship between gas pressure and volume, the internal air pressure continuously increases. The staff can track the air pressure changes in real time through the pressure sensor installed on the surface of the base 2, thereby simulating different air pressure environments to test the air tightness of the pipe. If the air pressure rises steadily as the sealing plate 74 moves downwards and remains stable after it stops moving downwards, the pipe is qualified for air tightness. If the air pressure rises slowly or drops rapidly after it stops moving downwards, it indicates that there is a leakage problem in the pipe. Thus, the whole process is carried out simultaneously with the laser detection, eliminating the need for a separate air tightness detection process, effectively shortening the single detection cycle and improving the efficiency of batch detection.

[0040] Meanwhile, as the laser rangefinder A5 moves down along the outer wall of the pipe, it collects distance data from the outer wall in real time, thereby calculating the outer diameter of the TPU pipe. As the laser rangefinder B6 moves down along the inner wall of the pipe, it simultaneously collects distance data from the inner wall, enabling the detection of the inner diameter of the pipe. In addition, since the pressure rod 73 is rotatably connected to the cylinder 72 through a bearing, when the pressure rod 73 rotates, it will drive the laser rangefinder A5 and laser rangefinder B6 at both ends of the fixed rod 71 to rotate synchronously. This enables data collection from multiple directions and multiple areas of the TPU pipe, effectively avoiding blind spots that may exist in single-direction detection, and further improving the accuracy of inner and outer diameter detection.

[0041] The bottom of the laser rangefinder A5 is provided with a cleaning mechanism 8. The cleaning mechanism 8 includes an annular plate 81 installed on the side wall of the laser rangefinder A5. The bottom of the annular plate 81 is connected to an L-shaped rod 82. An inner plate 83 is installed at one end of the L-shaped rod 82. A scraper 84 for scraping off impurities is slidably provided inside the inner plate 83. A connecting pipe 85 is connected between the inner cavity of the pressing rod 73 and the inner cavity of the annular plate 81.

[0042] It should be noted that when the airflow generated by the fan 77 is delivered to the inside of the cylinder 72 through the air supply pipe A78, the high-speed airflow will directly impact the fan blade 76 fixed at the top of the pressure rod 73, causing the fan blade 76 to rotate around its own axis. When the fan blade 76 rotates, it will drive the pressure rod 73 to rotate synchronously. The pressure rod 73 is fixedly connected to the sealing plate 74 at the bottom, which in turn drives the sealing plate 74 to rotate. The air cushion 75 fitted on the outer wall of the sealing plate 74 also rotates synchronously. When the air cushion 75 is in contact with the inner wall of the pipe, the rotating air cushion 75 can wipe and clean the dust, debris and other impurities remaining on the inner wall of the pipe.

[0043] Meanwhile, when the airflow enters the cylinder 72, a portion of it enters the inner cavity of the annular plate 81 through the connecting pipe 85. The bottom end of the annular plate 81 is connected to the L-shaped rod 82. The airflow entering the annular plate 81 flows into the L-shaped rod 82. The L-shaped rod 82 has a pre-set air supply channel that connects to the inner plate 83. The airflow enters the inner plate 83 of the L-shaped rod 82 through this channel. The thrust generated by the airflow in the inner plate 83 pushes the scraper 84 to slide outward along the inner plate 83 until the scraper 84 is tightly attached to the TPU tube. On the outer wall, the pressure rod 73 rotates under the drive of the fan blade 76, which in turn drives the scraper 84 to rotate around the pipe axis. The friction between the scraper 84 and the outer wall of the pipe removes impurities such as residual plastic debris and dust from the production process. This achieves simultaneous cleaning of impurities on the inner and outer walls of the pipe, keeping them clean and flat. This provides a clear and interference-free testing environment for laser inspection, reduces testing errors caused by impurities, and further ensures the accuracy of the inner and outer diameter testing data.

[0044] A detection mechanism 9 is provided on one side of the built-in plate 83;

[0045] Both sets of laser rangefinder sensors A5 have an air curtain mechanism 10 on their surfaces.

[0046] See Figures 1 to 2 As shown, the clamping assembly includes a cylinder 11 mounted on the surface of the base 2. A clamping block 12 is mounted on the telescopic end of the cylinder 11. The clamping block 12 is arranged in an arc shape, and the arc-shaped clamping block 12 can adapt to the circular contour of the TPU pipe.

[0047] See Figure 3 As shown, a fixing rod 71 is sleeved on the outer wall of the pressing rod 73, a laser range sensor A5 is installed at both ends of the fixing rod 71, and a laser range sensor B6 is installed on the outer wall of the pressing rod 73.

[0048] See Figure 3 As shown, a blower 77 is installed on the side wall of the electric push rod 3. The output end of the blower 77 is connected to one end of the air supply pipe A78. The blower 77 installed on the side wall of the electric push rod 3 is the core air source component of the device. Its output end is connected to the air supply pipe A78, which can stably output compressed gas and accurately deliver it to the inside of the cylinder 72 through the air supply pipe A78, providing power for the expansion of the air cushion 75 of the inflation mechanism 7 and realizing the sealing of the inside of the pipe.

[0049] See Figures 2 to 6As shown, the scraper 84 is made of rubber material, and a pressure sensor is installed on the top of the base 2. The scraper 84 is made of rubber material, which is soft and elastic. When scraping off impurities on the outer wall of the pipe, it can avoid the rigid material from scratching or squeezing the outer wall of the TPU pipe. The pressure sensor can monitor the changes in the internal air pressure of the pipe in real time. It can not only control the start and stop of the fan 77 when the air pressure reaches the preset threshold, but also provide data for the airtightness test of the pipe and the pressure regulation of the testing mechanism 9, ensuring that each process runs accurately according to the preset process and ensuring the accuracy and reliability of the test.

[0050] See Figures 8 to 9 As shown, the detection mechanism 9 includes a sealing ring 91 rotatably mounted on the inner wall of the base 2. A ball 92 communicating with the inner cavity of the base 2 is installed on the side wall of the sealing ring 91. A spring rod 93 is installed on the inner wall of the ball 92. A sealing ball 94 for sealing the ball 92 is installed at one end of the spring rod 93. A horizontal tube 95 communicating with the ball 92 is installed on the surface of the L-shaped rod 82. A squeezing rod 96 is slidably installed inside the horizontal tube 95 by a spring. One end of the squeezing rod 96 is fixedly connected to the side wall of the scraper 84. An air supply pipe B97 communicates between the ball 92 and the horizontal tube 95.

[0051] It should be noted that as the sealing plate 74 continues to move down along the inside of the pipe, the air pressure in the enclosed space inside the pipe continues to rise. When the sealing plate 74 moves down to a certain position and the air pressure inside the pipe reaches a preset threshold, the pressure sensor on the surface of the base 2 will detect this specified threshold. Subsequently, the pressure sensor sends a control signal to stop the fan 77 from working. After the fan 77 stops running, no new airflow is delivered to the cylinder 72. The airflow thrust that originally pushed the scraper 84 to adhere to the outer wall of the pipe disappears, and the scraper 84 stops cleaning the outer wall of the pipe.

[0052] Simultaneously, the downward pressure rod 73 continues to move downward, causing the pressure inside the base 2 to continuously increase and reach another preset threshold. When this pressure is reached, the gas pressure inside the base 2 acts on the sealing ball 94 inside the sphere 92, causing the sealing ball 94 to move to one side. This movement compresses the spring rod 93, causing it to deform under pressure. At this point, a gap is formed between the inner cavity of the base 2 and the sealing ball 94. Gas enters the gas supply pipe B97 through this gap, and then enters the horizontal tube 95 through the gas supply pipe B97. As gas accumulates in the horizontal tube 95, the gas pressure inside the horizontal tube 95 increases. As the pressure increases, the high-pressure gas exerts a thrust on the extrusion rod 96 inside the horizontal tube 95. The extrusion rod 96 transmits this thrust to the scraper 84 at one end, causing the scraper 84 to compress the surface of the tube. As the gas pressure inside the horizontal tube 95 continues to rise, the extrusion pressure exerted by the scraper 84 on the surface of the tube continuously increases. By simulating the pressure changes in actual use of the tube through gas pressurization, the structural stability of the tube under different pressures can be accurately detected. This effectively filters out tubes that do not meet the requirements for pressure resistance, preventing such tubes from deforming or cracking under actual pressure in subsequent use, thus ensuring the safety and reliability of the tubes during application.

[0053] See Figure 8 As shown, a limit block is installed on the side wall of the annular plate 81, and a connecting rod 14 is fixedly connected to the outer wall of the sealing ring 91. The annular plate 81 slides along the outer wall of the connecting rod 14.

[0054] See Figures 6 to 7 As shown, the air curtain mechanism 10 includes an annular tube 101 installed on the outer wall of the laser rangefinder A5. One end of the annular tube 101 is connected to a jet ring 102. One end of the jet ring 102 is provided with jet holes 103 evenly distributed along its axis. An air supply pipe C104 is connected between the built-in plate 83 and the annular tube 101.

[0055] It should be noted that when the airflow pushes the scraper 84 inside the built-in plate 83 toward the outer wall of the pipe, before the scraper 84 moves, its initial position blocks the air supply pipe C104 connecting the built-in plate 83 and the annular pipe 101, preventing the airflow from entering the air supply pipe C104. As the scraper 84 moves toward the outer wall of the pipe under the action of the airflow, the relative position between the scraper 84 and the port of the air supply pipe C104 changes, gradually releasing the obstruction to the air supply pipe C104. At this time, some of the airflow inside the built-in plate 83 can enter the annular pipe 101 installed on the outer wall of the laser rangefinder A5 through the air supply pipe C104.

[0056] The airflow entering the annular tube 101 is evenly distributed along the cavity of the annular tube 101 and flows smoothly into the interior of the jet ring 102 through the connecting channel of the jet ring 102 connected to one end of the annular tube 101. This causes the airflow to be evenly ejected from the jet hole 103, forming a continuous and stable annular air curtain on the outside of the laser range sensor A5. The airflow barrier formed by the air curtain can actively block the diffusion of suspended particles in the external environment to the area where the laser head is located. Even if there is air flow or slight dust in the detection environment, the airflow barrier can effectively isolate these interference factors, ensuring that the entire propagation process of the laser from emission to reception is unobstructed and interference-free. At the same time, the air curtain can isolate the influence of external turbulence on the laser detection module, prevent optical path drift caused by turbulence, ensure that the laser signal always maintains stable propagation, reduce detection errors caused by environmental interference, and further improve the accuracy and reliability of TPU pipe inner and outer diameter detection data.

[0057] In addition, when the airflow is ejected from the air holes 103 of the two sets of air jet rings 102, a convective airflow is formed. After the two airflows converge on the outer wall of the pipe, they form a continuous upward and downward airflow along the outer wall of the pipe. Through the downward airflow along the outer wall of the pipe, the fine impurities that may remain after the scraper 84 is cleaned a second time, and the tiny dust and debris attached to the outer wall of the pipe are carried away from the detection area along the direction of the airflow, further improving the cleanliness of the pipe surface.

[0058] See Figure 4 As shown, the outer wall of the sealing plate 74 has multiple sets of exhaust holes, which are arranged in a ring array along the axis of the sealing plate 74. The spacing between adjacent sets of exhaust holes is equal. The airflow delivered by the inner cavity of the pressure rod 73 can be evenly distributed to the air cushion 75 through the exhaust holes, so that the air cushion 75 expands evenly.

[0059] Working principle: When TPU pipe needs to be tested, the staff first places the TPU pipe to be tested on the base 2, and then starts the cylinder 11 in the clamping assembly. The telescopic end of the cylinder 11 will drive the arc-shaped clamping block 12 to move towards the outer wall of the pipe until the clamping block 12 is tightly attached to the outer wall of the pipe.

[0060] After the pipe positioning is completed, the staff starts the electric push rod 3. The output end of the electric push rod 3 drives the mounting plate 4 to move down as a whole. The mounting plate 4 simultaneously drives the laser rangefinder A5 and the laser rangefinder B6 to move down along the outer and inner walls of the pipe, respectively. While the electric push rod 3 moves down, the fan 77 connected to the air supply pipe A78 is started. The compressed air generated by the fan 77 is delivered to the inside of the cylinder 72 fixed at the top of the mounting plate 4 through the air supply pipe A78. Since the lower pressure rod 73 connected to the bottom of the cylinder 72 by the bearing is a hollow structure, the airflow will smoothly enter the sealing plate 74 installed at its bottom through the inner cavity of the lower pressure rod 73. Then the airflow is injected into the air cushion 75 sleeved on the outer wall of the sealing plate 74 through the exhaust hole opened on the outer wall of the sealing plate 74, causing the air cushion 75 to expand continuously. The expanded air cushion 75 is tightly attached to the inner wall of the pipe, thereby achieving a seal inside the pipe.

[0061] As the electric push rod 3 continuously moves the laser rangefinder A5 and laser rangefinder B6 downwards, the electric push rod 3 also simultaneously moves the pressure rod 73. The pressure rod 73 then moves the sealing plate 74 downwards along the sealed pipe. Since the sealing plate 74 and the air cushion 75 have formed a closed space inside the pipe, as the sealing plate 74 moves downwards, the volume of the closed space inside the pipe gradually decreases. According to the relationship between gas pressure and volume, the internal air pressure continuously increases. The staff can track the air pressure changes in real time through the pressure sensor installed on the surface of the base 2, thereby simulating different air pressure environments to test the airtightness of the pipe.

[0062] Meanwhile, as the laser rangefinder A5 moves down along the outer wall of the pipe, it collects the distance data between itself and the outer wall of the pipe in real time, and then calculates the outer diameter of the TPU pipe. When the laser rangefinder B6 moves down along the inner wall of the pipe, it collects the distance data between itself and the inner wall of the pipe simultaneously, so as to detect the inner diameter of the pipe. In addition, since the pressure rod 73 is rotatably connected to the cylinder 72 through the bearing, when the pressure rod 73 rotates, it will drive the laser rangefinder A5 and the laser rangefinder B6 at both ends of the fixed rod 71 to rotate synchronously.

[0063] When the airflow generated by the fan 77 is delivered to the inside of the cylinder 72 through the air supply pipe A78, the high-speed airflow will directly impact the fan blade 76 fixed at the top of the pressure rod 73, causing the fan blade 76 to rotate around its own axis. When the fan blade 76 rotates, it will drive the pressure rod 73 to rotate synchronously. The pressure rod 73 is also fixedly connected to the sealing plate 74 at the bottom, which in turn drives the sealing plate 74 to rotate. The air cushion 75 fitted on the outer wall of the sealing plate 74 also rotates synchronously.

[0064] Meanwhile, when the airflow enters the cylinder 72, a portion of the airflow will enter the inner cavity of the annular plate 81 through the connecting pipe 85. The bottom end of the annular plate 81 is connected to the L-shaped rod 82. The airflow entering the annular plate 81 will flow into the L-shaped rod 82. The L-shaped rod 82 has a pre-set air supply channel connected to the inner plate 83. The airflow enters the inner plate 83 of the L-shaped rod 82 through this channel. The thrust generated by the airflow in the inner plate 83 will push the scraper 84 to slide outward along the inner plate 83 until the scraper 84 is tightly attached to the outer wall of the TPU pipe. At the same time, because the pressure rod 73 is rotating under the drive of the fan blade 76, the rotation of the pressure rod 73 will synchronously drive the scraper 84 to rotate around the axis of the pipe.

[0065] As the sealing plate 74 continues to move down along the inside of the pipe, the air pressure in the enclosed space inside the pipe continues to rise. When the sealing plate 74 moves down to a certain position and the air pressure inside the pipe reaches a preset threshold, the pressure sensor on the surface of the base 2 will detect this specified threshold. Then the pressure sensor sends a control signal to stop the fan 77 from working. After the fan 77 stops running, no new airflow is delivered to the cylinder 72. The airflow thrust that originally pushed the scraper 84 to adhere to the outer wall of the pipe disappears, and the scraper 84 stops cleaning the outer wall of the pipe.

[0066] Simultaneously, the downward pressure rod 73 continues to move downward, causing the pressure inside the base 2 to continuously increase and reach another preset threshold. When this pressure is reached, the gas pressure inside the base 2 will act on the sealing ball 94 inside the sphere 92, causing the sealing ball 94 to move to one side. This causes the sealing ball 94 to move and squeeze the spring rod 93 in contact with it. The spring rod 93 contracts under pressure, causing it to deform. At this time, a gap is formed between the inner cavity of the base 2 and the sealing ball 94. Gas enters the gas supply pipe B97 through this gap, and then enters the horizontal pipe 95 through the gas supply pipe B97. As the gas accumulates in the horizontal pipe 95, the gas pressure inside the horizontal pipe 95 increases synchronously. The high-pressure gas generates a thrust on the extrusion rod 96 inside the horizontal pipe 95. The extrusion rod 96 transmits this thrust to the scraper 84 attached to one end, causing the scraper 84 to squeeze the surface of the pipe. As the gas pressure inside the horizontal pipe 95 continues to rise, the extrusion force of the scraper 84 on the surface of the pipe continues to increase. The gas pressurization simulates the pressure changes in the actual use of the pipe.

[0067] When the airflow pushes the scraper 84 inside the built-in plate 83 toward the outer wall of the pipe, before the scraper 84 moves, its initial position blocks the air supply pipe C104 connecting the built-in plate 83 and the annular pipe 101, preventing the airflow from entering the air supply pipe C104. As the scraper 84 moves toward the outer wall of the pipe under the action of the airflow, the relative position between the scraper 84 and the port of the air supply pipe C104 changes, gradually releasing the obstruction to the air supply pipe C104. At this time, some of the airflow inside the built-in plate 83 can enter the annular pipe 101 installed on the outer wall of the laser rangefinder A5 through the air supply pipe C104.

[0068] The airflow entering the annular tube 101 will be evenly distributed along the cavity of the annular tube 101, and will flow smoothly into the interior of the jet ring 102 through the connecting channel of the jet ring 102 connected to one end of the annular tube 101, so that the airflow will be evenly ejected from the jet hole 103, forming a continuous and stable annular air curtain on the outside of the laser rangefinder A5.

[0069] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A TPU pipe inner diameter and outer diameter detection device, comprising a workbench (1), two groups of laser ranging sensors A (5) and laser ranging sensors B (6), characterized in that: The top of the workbench (1) is provided with a base (2), the surface of the base (2) is provided with a clamping assembly for positioning pipe fittings, the top of the workbench (1) is provided with a support rod (13), the both sides of the support rod (13) are provided with an electric push rod (3), the output end of the electric push rod (3) is provided with a mounting plate (4); The surface of the mounting plate (4) is provided with an inflation mechanism (7), the inflation mechanism (7) comprises a cylinder (72) fixedly installed at the top of the mounting plate (4), the bottom end of the cylinder (72) is rotatably provided with a pressing rod (73) through a bearing, the bottom end of the pressing rod (73) is provided with a sealing plate (74), the side wall of the cylinder (72) is communicated with a gas conveying pipe A (78), the outer wall of the sealing plate (74) is sleeved with an air cushion (75), and the top end of the pressing rod (73) is fixedly provided with a fan blade (76). The bottom end of the laser ranging sensor A (5) is provided with a cleaning mechanism (8), the cleaning mechanism (8) comprises an annular plate (81) installed on the side wall of the laser ranging sensor A (5), the bottom end of the annular plate (81) is communicated with an L-shaped rod (82), one end of the L-shaped rod (82) is provided with an inner plate (83), the inner part of the inner plate (83) is slidably provided with a scraper (84), and the inner cavity of the pressing rod (73) and the inner cavity of the annular plate (81) are communicated through a connecting pipe (85). One side of the inner plate (83) is provided with a detection mechanism (9), the detection mechanism (9) comprises a sealing ring (91) rotatably arranged on the inner wall of the base (2), the side wall of the sealing ring (91) is provided with a ball (92) communicated with the inner cavity of the base (2), the inner wall of the ball (92) is provided with a spring rod (93), one end of the spring rod (93) is provided with a sealing ball (94) for sealing the ball (92), the surface of the L-shaped rod (82) is provided with a cross pipe (95) communicated with the ball (92), the inside of the cross pipe (95) is slidably provided with an extrusion rod (96) through a spring, one end of the extrusion rod (96) is fixedly connected with the side wall of the scraper (84), and the ball (92) and the cross pipe (95) are communicated through a gas conveying pipe B (97). The surfaces of the two groups of laser ranging sensors A (5) are provided with air curtain mechanisms (10).

2. The TPU pipe inner and outer diameter detection device according to claim 1, characterized in that: The clamping assembly comprises a gas cylinder (11) installed on the surface of the base (2), and the telescopic end of the gas cylinder (11) is provided with a clamping block (12).

3. The TPU pipe inner and outer diameter detection device according to claim 1, characterized in that: The outer wall of the pressing rod (73) is sleeved with a fixed rod (71), the laser ranging sensor A (5) is installed at both ends of the fixed rod (71), and the laser ranging sensor B (6) is installed on the outer wall of the pressing rod (73).

4. The TPU pipe inner and outer diameter detection device according to claim 1, characterized in that: The side wall of the electric push rod (3) is provided with a fan (77), and the output end of the fan (77) is communicated with one end of the gas conveying pipe A (78).

5. The TPU pipe inner and outer diameter detection device according to claim 1, characterized in that: The scraper (84) is made of rubber material, and the top of the base (2) is provided with a pressure sensor.

6. The TPU pipe inner and outer diameter detection device according to claim 1, characterized in that: The side wall of the annular plate (81) is provided with a limiting block, the outer wall of the sealing ring (91) is fixedly connected with a connecting rod (14), and the annular plate (81) slides along the outer wall of the connecting rod (14).

7. The TPU pipe inner and outer diameter detection device according to claim 1, characterized in that: The air curtain mechanism (10) comprises an annular pipe (101) mounted on the outer wall of the laser ranging sensor A (5), one end of the annular pipe (101) is communicated with a gas jet ring (102), one end of the gas jet ring (102) is provided with gas jet holes (103) equidistantly distributed along the axis of the gas jet ring (102), and the built-in plate (83) and the annular pipe (101) are communicated with a gas conveying pipe C (104).

8. The TPU pipe inner and outer diameter detection device according to claim 1, characterized in that: The outer wall of the sealing plate (74) is provided with a plurality of groups of exhaust holes, the plurality of groups of exhaust holes are arranged in an annular array along the axis of the sealing plate (74), and the spacing between adjacent two groups of exhaust holes is equal.

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