Device for measuring wall thickness of various cylinder structures with small inner diameter and large length

Abstract

The utility model provides a wall thickness measuring device for various cylinder structures with small inner diameters and large lengths. The wall thickness measuring device comprises a pressing mechanism, a length detection mechanism and a wall thickness measuring mechanism which are installed on the same supporting platform. The pressing mechanism is provided with a pressing block, the length detection mechanism is provided with a V-shaped positioning block, and the upper end and the lower end of the pipe are fixed through the pressing block and the V-shaped positioning block. The wall thickness measuring mechanism is provided with a second movable sliding table and an electric cylinder connecting plate, and the second movable sliding table drives the electric cylinder connecting plate to be away from or close to the pipe; the second movable sliding table is provided with a servo motor capable of driving the electric cylinder connecting plate to rotate, and the electric cylinder connecting plate is provided with two sets of laser sensors used for measuring the wall thickness of the pipe. The wall thickness measuring device for the small-inner-diameter and large-length various cylinder structures has the following advantages: (1) non-contact accurate wall thickness measurement by using the inner laser sensor and the outer laser sensor is realized; (2) the device adapts to pipes with different inner diameters and is convenient to use; and (3) the operation is automatic.

Description

Technical Field

[0001] The utility model relates to a tube measuring device, in particular to a device for measuring the wall thickness of various tube structures with small inner diameters and large lengths. Background Art

[0002] Measuring the wall thickness of tubular products can help ensure that the manufacturing of tubular products meets the specified standards and requirements, and detect whether there are defects or deviations in tubular products, thereby ensuring the quality of tubular products. At the same time, the wall thickness of tubular products is an important indicator for evaluating their ability to withstand pressure and load. Therefore, measuring the wall thickness of tubular products can help ensure the quality, safety, prevent leakage, predict life, and meet compliance requirements of tubular products. This is of great significance for ensuring the normal operation of projects and equipment, protecting personnel safety, and reducing risks.

[0003] For daily measurement of tube wall thickness, people generally use measuring tools such as micrometers and calipers. The measurement accuracy of these manual tools is not high and they are only suitable for situations where the workload is not large. If the measurement workload is large or the accuracy requirement is high, manual measuring tools are no longer applicable. At present, the commonly used methods for automatic thickness measurement of tubes are electromagnetic method, ultrasonic method and ray method. The electromagnetic method mainly relies on the principle that the change of workpiece wall thickness causes the change of magnetic flux to complete the measurement of steel tube wall thickness. This method based on relative measurement requires first giving a reference thickness value, and then comparing the measured value with the reference value to obtain the estimated thickness. Therefore, the measurement error is large, and generally only the wall thickness of <12mm can be detected. In comparison, the ultrasonic pulse reflection method can directly measure the wall thickness value, which is usually achieved by using a single straight probe to send and receive or two oblique probes to send and receive. Therefore, the ultrasonic method is currently the most widely used wall thickness measurement method, but the conventional ultrasonic method requires coupling agent and is a contact measurement with a slow detection speed, so it is not suitable for high temperature and high speed detection, and the result of ultrasonic thickness measurement is greatly affected by the roughness of the workpiece surface; and for small diameter steel pipes, due to the large curvature, the accuracy of thickness measurement using ultrasonic method is not high. The wall thickness measurement method based on the ray method is too expensive and has too high requirements on the environment. Therefore, wall thickness measurement of tube products is a problem that needs to be solved. Utility Model Content

[0004] The utility model provides a wall thickness measuring device for various cylindrical structures with small inner diameter and large length, which solves the problem of measuring the wall thickness of cylindrical structures with small inner diameter and large length. The technical solution is as follows:

[0005] A wall thickness measuring device for various tubular structures with small inner diameters and large lengths, comprising a clamping mechanism, a length detection mechanism and a wall thickness measuring mechanism installed on the same supporting platform; the clamping mechanism is provided with a pressing block, and the length detection mechanism is provided with a V-shaped positioning block, and the upper and lower ends of the pipe are fixed by the pressing block and the V-shaped positioning block; the wall thickness measuring mechanism is provided with a second movable slide and an electric cylinder connecting plate, and the electric cylinder connecting plate is driven away from or close to the pipe by the second movable slide; the second movable slide is provided with a servo motor capable of driving the electric cylinder connecting plate to rotate, and the electric cylinder connecting plate is installed with two groups of laser sensors for measuring the wall thickness of the pipe.

[0006] The length detection mechanism is located below the clamping mechanism, and the wall thickness measurement mechanism is located at the front end of the clamping mechanism. The clamping mechanism, the length detection mechanism and the wall thickness measurement mechanism are all connected to the control mechanism, and the control mechanism is installed on the supporting platform.

[0007] The clamping mechanism includes a fixed frame, an adjusting cylinder, a cylinder connecting plate, a clamping cylinder and a pressing block. The fixed frame is fixed on a supporting platform, and an adjusting cylinder is arranged at one end of the fixed frame away from the pipe. The cylinder connecting plate is connected to the piston of the adjusting cylinder. The cylinder connecting plate is provided with a clamping cylinder for completing the action of clamping the pipe, and a pressing block is arranged at the bottom of the clamping cylinder.

[0008] The fixed frame is provided with a linear guide rail and a slider. The linear guide rail is provided with two left and right groups and is located above the fixed frame. The linear guide rail is provided with a slider. The two sliders are fixedly connected to the left and right sides of the cylinder connecting plate.

[0009] The clamping mechanism comprises a material baffle plate located in front of the extruder outlet and a photoelectric sensor placed on the plane of the material baffle plate.

[0010] The length detection mechanism includes a product positioning platform installed on the support platform, one end of the product positioning platform is fixedly connected to the V-shaped positioning block through a connecting block, and the other end is provided with a slide cylinder, and the slide cylinder is provided with a calibration block and a distance measuring sensor.

[0011] The wall thickness measuring mechanism includes an adjustable base plate, a first single-line rail slide, a second single-line rail slide and an electric cylinder connecting plate. The first single-line rail slide is placed in a vertical direction, and its lower end is fixedly connected to the adjustable base plate; the second single-line rail slide is placed in a horizontal direction and is connected to the slider of the first single-line rail slide; the second movable slide is provided with a servo motor capable of driving the electric cylinder connecting plate to rotate, and the second movable slide is connected to the electric cylinder connecting plate.

[0012] The electric cylinder connecting plate is installed with two groups of laser sensors for measuring the wall thickness of the pipe, namely a built-in laser sensor and an external laser sensor. The electric cylinder connecting plate is also provided with an electric cylinder for driving the external laser sensor. The built-in laser sensor can correspond to the straight line where the center of the pipe is located through the first single-line rail slide and the second single-line rail slide, and the external laser sensor is driven away from or close to the built-in laser sensor through the electric cylinder.

[0013] The adjustable base plate is placed on the supporting platform and connected to the first single-line rail slide via a fixed leg. The side of the fixed leg is provided with an X-axis adjustment bolt for adjusting the X-axis direction and a Y-axis adjustment bolt for adjusting the Y-axis direction.

[0014] The servo motor drives the electric cylinder connecting plate to rotate through the rotating shaft, and the rotating shaft and the servo motor are connected by a coupling. The rotating shaft is provided with a cam baffle, and the second movable slide is provided with a slot-type photoelectric. The slot-type photoelectric and the cam baffle are used to record and control the rotation position and amount of the servo motor during detection.

[0015] The wall thickness measuring device for various cylindrical structures with small inner diameters and large lengths has the following advantages: (1) it realizes non-contact accurate wall thickness measurement using two internal and external laser sensors; (2) it is adaptable to pipes with different inner diameters and is easy to use; and (3) it is automated and simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the wall thickness measuring device for various cylinder structures with small inner diameter and large length;

[0017] Figure 2 is a structural schematic diagram of the clamping mechanism;

[0018] Figure 3 is a structural schematic diagram of the length detection mechanism;

[0019] Figure 4 is a structural schematic diagram of the wall thickness detection mechanism;

[0020] Figure 5 is a schematic diagram of the position of the laser sensor;

[0021] Figure 6 is a schematic diagram of the positions of the clamping mechanism and the wall thickness detection mechanism;

[0022] Figure 7 is a schematic diagram of the positions of the clamping mechanism and the length detection mechanism;

[0023] Figure 8 is a schematic diagram of the pressing block pressing the pipe after the pressing cylinder is lowered;

[0024] Fig. 9 is a schematic diagram of the lower part of the wall thickness detection mechanism;

[0025] Fig.10 Schematic diagram of the guide shaft support.

[0026] The following are the reference numerals:

[0027] Clamping mechanism 1; length detection mechanism 2; wall thickness measurement mechanism 3; control device 4; support platform 5;

[0028] Baffle plate 6; photoelectric sensor 7; fixed frame 8; adjusting cylinder 9; linear guide 10; slide block 11; cylinder connecting plate 12; pressing cylinder 13; pressing block 14;

[0029] Product positioning platform 15; calibration block 16; slide cylinder 17; distance sensor 18; connection block 19; V-shaped positioning block 20;

[0030] Adjustable base plate 21; fixed support leg 23; X-axis adjustment bolt 22; Y-axis adjustment bolt 24; first monolinear slide 25; second monolinear slide 26; servo motor 27; coupling 28; slotted photoelectric 29; cam baffle 30; electric cylinder 31; built-in laser sensor 32; external laser sensor 33; rotating shaft 34; guide shaft support 35; electric cylinder connecting plate 36; pipe 37. DETAILED DESCRIPTION

[0031] like Figures 1 to 5 As shown, the wall thickness measuring device for various tube structures with small inner diameter and large length comprises a clamping mechanism 1, a length detection mechanism 2 and a wall thickness measuring mechanism 3 installed on the same support platform 5; the clamping mechanism 1 is provided with a clamping block 14, and the length detection mechanism 2 is provided with a V-shaped positioning block 20, and the upper and lower ends of the pipe are fixed by the clamping block 14 and the V-shaped positioning block 20; the wall thickness measuring mechanism 3 is provided with a second movable slide 26 and an electric cylinder connecting plate 36, and the electric cylinder connecting plate 36 is driven by the second movable slide 26 to move away from or approach the opening of the pipe 37; the second movable slide 26 is provided with a servo motor 27 capable of driving the electric cylinder connecting plate 36 to rotate, and the electric cylinder connecting plate 36 is installed with two groups of laser sensors for measuring the wall thickness of the pipe, and the laser sensors all adopt laser ranging sensors.

[0032] Combination Figure 6 and Figure 7As shown, the length detection mechanism 2 is located below the clamping mechanism 1, and the wall thickness measuring mechanism 3 is located at the front end of the clamping mechanism 1. The clamping mechanism 1, the length detection mechanism 2 and the wall thickness measuring mechanism 3 are all connected to the control mechanism 4, and the control mechanism 4 is also installed on the supporting platform 5. The control mechanism 4 adopts Siemens PLC S7-400, which is used to control the actions of the clamping mechanism 1, the length detection mechanism 2 and the wall thickness measuring mechanism 3, and display and store the collected data.

[0033] exist Figure 2 In the figure, the clamping mechanism 1 includes a fixed frame 8, an adjusting cylinder 9, a cylinder connecting plate 12, a clamping cylinder 13 and a pressing block 14. The fixed frame 8 is fixed on the supporting platform 5, and an adjusting cylinder 9 is arranged at the front end thereof. The cylinder connecting plate 12 is connected to the piston of the adjusting cylinder 9, and the forward and backward movement is realized by the adjusting cylinder 9. The cylinder connecting plate 12 is provided with a clamping cylinder 13 for completing the action of clamping the pipe, and a pressing block 14 is arranged at the bottom of the clamping cylinder 13 for limiting the position of the pipe.

[0034] The fixed frame 8 is also provided with a linear guide 10 and a slider 11. The linear guide 10 is provided with two left and right groups, which are located above the fixed frame 8. The linear guide 10 is provided with a slider 11. The two sliders are fixedly connected to the left and right sides of the cylinder connecting plate 12. The linear guide 10 assists in adjusting the cylinder 9 so that the cylinder connecting plate 12 can run smoothly when moving forward and backward.

[0035] Furthermore, the clamping mechanism 1 further includes a baffle plate 6 located in front of the extruder outlet, and a photoelectric sensor 7 placed on the plane of the baffle plate 6. When the pipe moves forward from the extruder outlet, that is, moves toward the clamping mechanism 1, the photoelectric sensor 7 can determine that the pipe enters. Furthermore, the bottom of the baffle plate 6 is fixedly mounted on the support platform 5.

[0036] like Figure 3As shown, the length detection mechanism 2 includes a product positioning platform 15, a calibration block 16, a slide cylinder 17, a distance sensor 18, a connection block 19 and a V-shaped positioning block 20. The product positioning platform 15 is located on the support platform, and its rear end is fixedly connected to the V-shaped positioning block 20 through the connection block 19. The V-shaped positioning block 20 is located above the product positioning platform 15 and is in a "V" shape, which is used to support the lower part of the pipe. The front end of the product positioning platform 15 is provided with a slide cylinder 17, and the slide cylinder 17 is a telescopic cylinder in the vertical direction. The other end of its cylinder push rod is provided with a distance sensor 18, which can be a laser distance sensor. The distance sensor 18 is used to measure the length of the pipe, and the measurement is performed from the opening at one end of the pipe. The other end of the pipe is closed by the extruder to achieve the measurement of the length of the pipe. The front end of the slide cylinder 17 is provided with a calibration block 16, which is used to cooperate with the mold barrel to achieve the height reference. The calibration block 16 is provided with an "L"-shaped stopper on one side close to the slide cylinder 17, which is used to determine and correct the reference. Before processing the pipe, a mold barrel can be used for initial setting. The mold barrel is a cylinder with a standard structure, one end of which is placed on the calibration block 16, and the upper and lower ends are fixed by the pressing block 14 and the V-shaped positioning block 20 respectively. Through the calibration block 16, the reference of the pressing block 14 and the V-shaped positioning block 20 can be corrected. Figure 8 As shown, the mold cylinder moves forward until it reaches the calibration block 16 and is blocked by the calibration block 16.

[0037] like Figure 4 As shown, the wall thickness measuring mechanism 3 includes an adjustable bottom plate 21, a first single-line rail slide 25, a second single-line rail slide 26 and an electric cylinder connecting plate 36. The first single-line rail slide 25 is placed in a vertical direction, and its lower end is fixedly connected to the adjustable bottom plate 21; the second single-line rail slide 26 is placed in a horizontal direction and connected to the slider of the first single-line rail slide 25; the second movable slide 26 is provided with a servo motor 27 capable of driving the electric cylinder connecting plate 36 to rotate, and the second movable slide 26 is connected to the electric cylinder connecting plate 36. The electric cylinder connecting plate 36 is installed with two groups of laser sensors for measuring the wall thickness of the pipe, namely, a built-in laser sensor 32 and an external laser sensor 33. The electric cylinder connecting plate 36 is also provided with an electric cylinder 31 for driving the external laser sensor 33. By adjusting the first single-line rail slide 25 and the second single-line rail slide 26, the built-in laser sensor 32 is located on the straight line where the center of the pipe is located, and the external laser sensor 33 is driven away from or close to the built-in laser sensor 32 by the electric cylinder 31.

[0038] Combination Fig. 9As shown, the adjustable base plate 21 is placed on the support platform, and the adjustable base plate 21 is connected to the first monorail slide 25 through the fixed legs 23, and the first monorail slide 25 is placed vertically on the fixed legs 23. The side of the adjustable base plate 21 is provided with an X-axis adjustment bolt 22 that can be used to adjust the X-axis direction (left-right direction), and a Y-axis adjustment bolt 24 that can be used to adjust the Y-axis direction (front-back direction), and the position of the fixed legs 23 is finely adjusted by the X-axis adjustment bolt 22 and the Y-axis adjustment bolt 24.

[0039] Combination Fig.10 As shown, the servo motor 27 drives the electric cylinder connecting plate 36 to rotate through the rotating shaft 34, and the rotating shaft 34 and the servo motor 27 are connected through the coupling 28. The rotating shaft 34 is provided with a cam baffle 30, and the circumferential part of the cam baffle 30 is provided with an opening. The second movable slide 26 is provided with a slot-type photoelectric 29. When the opening of the cam baffle 30 reaches the slot-type photoelectric 29, the slot-type photoelectric 29 is provided with an infrared transmitter and an infrared receiver arranged relatively. The infrared rays emitted by the infrared transmitter pass through the opening to reach the infrared receiver, and are used to record and control the position and amount of rotation of the servo motor 27 during detection through the slot-type photoelectric 29 and the cam baffle 30.

[0040] The rotating shaft 34 is associated with the electric cylinder connecting plate 36 through the guide shaft support 35, and the guide shaft support 35 is fixed on the second movable slide 26. The electric cylinder 31 is placed on the back of the electric cylinder connecting plate 36. During detection, the built-in laser sensor 32 extends into the pipe 37 for recording, and the external laser sensor 33 records outside the pipe 37. The position of the external laser sensor 33 is adjusted by the translation of the electric cylinder 31 to adapt to pipes 37 with different inner diameters.

[0041] When using:

[0042] The utility model is realized through the cooperation of a pressing mechanism, a length measuring mechanism and a wall thickness measuring mechanism.

[0043] The clamping mechanism: the extruder sends out the pipe 37, and after it touches the baffle plate 6, the photoelectric sensor 7 senses that the material is in place, and then puts the pipe 37 into the same straight line of the V-shaped positioning block 20. The electric cylinder of the pushing servo mechanism set at the front end of the extruder runs, and sends the pipe 37 a fixed distance and enters the V-shaped positioning block 20 to complete the preliminary guiding positioning. After the electric cylinder retracts into place, the clamping cylinder 13 presses down to complete the fixation.

[0044] The length detection mechanism: after waiting for the clamping cylinder to complete the clamping action, the slide cylinder 17 rises and sends the distance sensor 18 to the same height as the pipe. After the distance measurement is completed, the slide cylinder 17 returns to its original position to complete the length detection.

[0045] The wall thickness detection mechanism: after the second movable slide 26 moves horizontally to the specified position, the servo motor 27 starts to move, rotates 180° clockwise and then stops, and then rotates 180° counterclockwise, and then two sets of laser sensors complete recording and detection. Finally, the second movable slide 26 returns to its original position to complete the wall thickness detection.

[0046] The utility model has the following advantages: (1) it realizes non-contact accurate wall thickness measurement using two internal and external laser sensors; (2) it is adaptable to pipes with different inner diameters and is easy to use; and (3) it is automated and easy to operate.

Claims

1. A device for measuring the wall thickness of various cylindrical structures with small inner diameter and large length, characterized by: It includes a clamping mechanism, a length detection mechanism and a wall thickness measuring mechanism installed on the same supporting platform; the clamping mechanism is provided with a pressing block, and the length detection mechanism is provided with a V-shaped positioning block, and the upper and lower ends of the pipe are fixed by the pressing block and the V-shaped positioning block; the wall thickness measuring mechanism is provided with a second movable slide and an electric cylinder connecting plate, and the electric cylinder connecting plate is driven away from or close to the pipe by the second movable slide; the second movable slide is provided with a servo motor capable of driving the electric cylinder connecting plate to rotate, and the electric cylinder connecting plate is installed with two groups of laser sensors for measuring the wall thickness of the pipe.

2. The device for measuring wall thickness of various cylinder structures with small inner diameter and large length according to claim 1 is characterized in that: The length detection mechanism is located below the clamping mechanism, and the wall thickness measurement mechanism is located at the front end of the clamping mechanism. The clamping mechanism, the length detection mechanism and the wall thickness measurement mechanism are all connected to the control mechanism, and the control mechanism is installed on the supporting platform.

3. The wall thickness measuring device for various cylinder structures with small inner diameter and large length according to claim 1 is characterized in that: The clamping mechanism includes a fixed frame, an adjusting cylinder, a cylinder connecting plate, a clamping cylinder and a pressing block. The fixed frame is fixed on a supporting platform, and an adjusting cylinder is arranged at one end of the fixed frame away from the pipe. The cylinder connecting plate is connected to the piston of the adjusting cylinder. The cylinder connecting plate is provided with a clamping cylinder for completing the action of clamping the pipe, and a pressing block is arranged at the bottom of the clamping cylinder.

4. The wall thickness measuring device for various cylinder structures with small inner diameter and large length according to claim 3 is characterized in that: The fixed frame is provided with a linear guide rail and a slider. The linear guide rail is provided with two left and right groups and is located above the fixed frame. The linear guide rail is provided with a slider. The two sliders are fixedly connected to the left and right sides of the cylinder connecting plate.

5. The wall thickness measuring device for various cylinder structures with small inner diameter and large length according to claim 1 is characterized in that: The clamping mechanism comprises a material baffle plate located in front of the extruder outlet and a photoelectric sensor placed on the plane of the material baffle plate.

6. The device for measuring wall thickness of various cylinder structures with small inner diameter and large length according to claim 1 is characterized in that: The length detection mechanism includes a product positioning platform installed on the support platform, one end of the product positioning platform is fixedly connected to the V-shaped positioning block through a connecting block, and the other end is provided with a slide cylinder, and the slide cylinder is provided with a calibration block and a distance measuring sensor.

7. The wall thickness measuring device for various cylinder structures with small inner diameter and large length according to claim 1 is characterized in that: The wall thickness measuring mechanism includes an adjustable base plate, a first single-line rail slide, a second single-line rail slide and an electric cylinder connecting plate. The first single-line rail slide is placed in a vertical direction, and its lower end is fixedly connected to the adjustable base plate; the second single-line rail slide is placed in a horizontal direction and is connected to the slider of the first single-line rail slide; the second movable slide is provided with a servo motor capable of driving the electric cylinder connecting plate to rotate, and the second movable slide is connected to the electric cylinder connecting plate.

8. The device for measuring wall thickness of various cylinder structures with small inner diameter and large length according to claim 7 is characterized in that: The electric cylinder connecting plate is installed with two groups of laser sensors for measuring the wall thickness of the pipe, namely a built-in laser sensor and an external laser sensor. The electric cylinder connecting plate is also provided with an electric cylinder for driving the external laser sensor. The built-in laser sensor can correspond to the straight line where the center of the pipe is located through the first single-line rail slide and the second single-line rail slide, and the external laser sensor is driven away from or close to the built-in laser sensor through the electric cylinder.

9. The wall thickness measuring device for various cylinder structures with small inner diameter and large length according to claim 7 is characterized in that: The adjustable base plate is placed on the supporting platform and connected to the first single-line rail slide via a fixed leg. The side of the fixed leg is provided with an X-axis adjustment bolt for adjusting the X-axis direction and a Y-axis adjustment bolt for adjusting the Y-axis direction.

10. The device for measuring wall thickness of various cylinder structures with small inner diameter and large length according to claim 7, characterized in that: The servo motor drives the electric cylinder connecting plate to rotate through the rotating shaft, and the rotating shaft and the servo motor are connected by a coupling. The rotating shaft is provided with a cam baffle, and the second movable slide is provided with a slot-type photoelectric. The slot-type photoelectric and the cam baffle are used to record and control the rotation position and amount of the servo motor during detection.

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