Synchronous automatic detection equipment for depth of internal threads at two ends of pipe fitting

Abstract

The invention provides pipe fitting double-end internal thread depth synchronous automatic detection equipment, which comprises a mounting seat, a pair of detection devices and a clamping device, and is characterized in that the pair of detection devices comprises a mounting plate, a position calibration mechanism, a driving cylinder, a connecting plate, a detection rod, a detection head, an elastic pressing plate, a pressure spring, a mounting cover, a pressure sensor, an integrated calculation unit and a digital display screen.

Description

Technical Field

[0001] The invention relates to the technical field of thread detection, and in particular to a synchronous automatic detection device for the depth of double-end internal threads of a pipe fitting. Background Art

[0002] The existing traditional internal thread depth inspection method usually adopts three inspection methods: one is the method of directly screwing the thread gauge into the threaded hole; the second is the straight rod method of equal substitution; the third is the method of inserting the depth gauge into the thread for inspection. The most frequently used method is to use the thread gauge for inspection, but the thread gauge can only detect one threaded hole at a time. When encountering some workpieces with multiple threaded holes that need to be inspected at the same time, repeated inspections are required, which is time-consuming and laborious. Although some existing special inspection equipment can detect multiple threaded holes at the same time, most of their threaded holes are on the same plane and have the same size. When inspecting some special workpieces, such as special tubular parts, because their threaded holes are located at both ends of the tubular parts, and the depth and pitch of the threads at both ends are different, the equipment cannot detect the threaded holes at both ends at the same time, and can only be turned to manual inspection one by one. There is an urgent need for a device that can simultaneously detect threaded holes of different sizes at both ends of the pipe to improve the inspection efficiency. Summary of the invention

[0003] In order to solve the deficiencies of the above-mentioned technology, the present invention provides a synchronous automatic detection device for the depth of double-end internal threads of pipe fittings, including a mounting seat, a pair of detection devices and a clamping device, wherein the clamping device is arranged on the mounting seat, the pair of detection devices are arranged on the mounting seat and are located on both sides of the clamping device, the pair of detection devices include a mounting plate, a position calibration mechanism, a driving cylinder, a connecting plate, a detection rod, a detection head, an elastic pressure plate, a compression spring, a mounting cover, a pressure sensor, an integrated computing unit and a digital display screen, the position calibration mechanism is arranged on the mounting seat, the mounting plate is arranged on the position calibration mechanism, the driving cylinder is arranged on the mounting plate, the connecting plate and the driving cylinder are connected to each other The piston rod is connected, the detection rod is arranged on the connecting plate, the detection rod is provided with a mounting groove which matches the mounting groove of the mounting cover, the mounting cover is detachably connected to the mounting groove, the mounting cover is respectively provided with a movable hole and a mounting hole which match the detection head and the pressure sensor, the detection head is arranged in the movable hole and slides with the movable hole, the pressure sensor is fixedly arranged in the mounting hole, the elastic pressure plate is arranged in the mounting groove, the two side surfaces at the middle position of the elastic pressure plate are rotatably connected with the mounting groove, the compression spring is arranged on the elastic pressure plate at one end close to the detection head, the integrated computing unit and the digital display screen are both arranged on the mounting plate and connected to the pressure sensor.

[0004] By adopting the above technical scheme, when detecting the internal threads at both ends of the tubular part, the tubular part is placed on the clamping device for clamping. After clamping, the height of a pair of detection devices is adjusted by the position calibration mechanism so that the detection heads of the pair of detection devices are aligned with the inner circumference of the pipe fitting respectively. Then, the detection device is started, and the driving cylinder drives the detection rod to move inside the pipe fitting at a fixed speed. During the movement, the detection head jumps up and down on the teeth of the thread, thereby applying periodically changing pressure to the elastic pressure plate. The elastic pressure plate transfers the pressure to the pressure sensor. After passing the full depth of the thread, the pressure no longer changes. At this time, the integrated calculation unit connected to the pressure sensor combines the number of pressure changes with the given speed of the driving cylinder to calculate the depth of the entire thread and display the calculation result on the digital display screen to complete the detection of the thread depth. Regardless of whether the threads at both ends are of different depths or sizes, an accurate depth value can be given through a single detection, which greatly improves the detection efficiency.

[0005] A further configuration of the present invention is that a ball for protecting the internal thread is provided at one end of the detection head, and a limiting plate for limiting the position in the movable hole is provided at the other end.

[0006] With the above technical solution, since one end of the detection head is provided with a ball for protecting the internal thread, and the other end is provided with a limit plate for limiting the position in the movable hole, the ball can reduce the pressure damage to the internal thread surface during detection.

[0007] Further configuration of the present invention: the clamping device includes a clamping platform, a movable rod, a sleeve rod, a tension spring and a pair of clamping plates, the sleeve rod is arranged on the clamping platform, the movable rod is arranged in the sleeve rod and slides with the sleeve rod, the tension spring is arranged in the sleeve rod and its two ends are respectively connected to the sleeve rod and the movable rod, and the pair of clamping plates are respectively arranged on the sleeve rod and the movable rod.

[0008] By adopting the above technical scheme, since the clamping device includes a clamping platform, a movable rod, a sleeve rod, a tension spring and a pair of clamping plates, the sleeve rod is arranged on the clamping platform, the movable rod is arranged in the sleeve rod and slides with the sleeve rod, the tension spring is arranged in the sleeve rod and its two ends are respectively connected to the sleeve rod and the movable rod, the pair of clamping plates are respectively arranged on the sleeve rod and the movable rod, the pipe fitting is clamped by a pair of clamping plates and clamped by the tension spring, which makes clamping simple and will not damage the outer surface of the pipe fitting.

[0009] A further configuration of the present invention is as follows: the position calibration mechanism includes an automatic lifting platform, a control unit and an infrared sensor; the automatic lifting platform is arranged on a mounting seat and is adjustably and movably connected to the mounting seat; the mounting plate is arranged on the automatic lifting platform; the infrared sensor is arranged on a connecting plate and its position matches that of the detection head; and the control unit is respectively connected to the infrared sensor and the automatic lifting platform.

[0010] With the above technical solution, since the position calibration mechanism includes an automatic lifting platform, a control unit and an infrared sensor, the automatic lifting platform is arranged on the mounting seat and is adjustably and movably connected to the mounting seat, the mounting plate is arranged on the automatic lifting platform, the infrared sensor is arranged on the connecting plate and its position matches the detection head, the control unit is respectively connected to the infrared sensor and the automatic lifting platform, after the pipe is clamped, the infrared sensor is started, at which time a part of the sensing rays is blocked by the detection head, when the detection head moves to a position flush with the inner diameter of the pipe as the automatic lifting platform rises and falls, another part of the sensing rays is blocked by the end face of the pipe, and the sensing rays are completely blocked, at which time the control unit controls the automatic lifting platform to stop operating, and the calibration of the position of the detection device is completed.

[0011] Further configuration of the present invention: a secondary detection device is also provided on the detection rod and a pair of clamping plates, the secondary detection device includes a pair of position sensors, a control unit and a tube body rotation mechanism, the pair of position sensors are respectively arranged on a pair of detection devices at positions located at the ends of the detection rod, the pair of position sensors are connected to the driving cylinder and the tube body rotation mechanism through the control unit, the tube body rotation mechanism includes a micro cylinder, a strong friction clamping plate and a connecting block, the pair of clamping plates are each provided with a sliding notch matching the connecting block, the micro cylinder is arranged on the clamping plate, the connecting block is arranged in the sliding notch and is respectively connected to the piston rods of the strong friction clamping plate and the micro cylinder.

[0012] According to the technical solution, since the detection rod and a pair of clamping plates are also provided with a secondary detection device, the secondary detection device includes a pair of position sensors, a control unit and a tube body rotation mechanism, the pair of position sensors are respectively arranged on a pair of detection devices at positions located at the ends of the detection rods, the pair of position sensors are connected to the driving cylinder and the tube body rotation mechanism through the control unit, the tube body rotation mechanism includes a micro cylinder, a strong friction clamping plate and a connecting block, the pair of clamping plates are each provided with a sliding notch matching the connecting block, the micro cylinder is arranged on the clamping plate, the connecting block is arranged in the sliding notch and is respectively connected to the piston rods of the strong friction clamping plate and the micro cylinder, A pair of strong friction clamps clamp the pipe fitting. When the detection rods at both ends are fully extended into the pipe fitting to complete the first thread depth detection, the detection rod continues to move until it reaches a pair of position sensor joints at the end of the detection rod. After the joint, the control unit controls the driving cylinder to stop working, and then controls the pipe body rotation mechanism to start operating. The micro cylinder drives the strong friction plate to move at a constant speed, driving the pipe fitting to rotate a certain angle around the axis in situ. After the pipe fitting rotates, the driving cylinder starts to recover at a constant speed. During the recovery process, the depth of the internal thread is measured again. When the detection rod is completely recovered, the integrated calculation unit combines the results of the two tests and eliminates the errors to obtain the final depth detection result, making the measurement more accurate.

[0013] A further configuration of the present invention is that the movable rod and the sleeve rod are further provided with transverse limiting clamps, and the transverse limiting clamps are provided with limiting grooves.

[0014] By adopting the above technical solution, since the movable rod and the sleeve rod are also provided with transverse limit clamps, the transverse limit clamps are provided with limit grooves. By adding the transverse limit clamps, the pipe fittings can be kept parallel to the measuring device through the limit grooves when clamping. At the same time, the position of the pipe fittings can be kept stable during rotation through the limit grooves, avoiding the situation where the detection head touches the internal thread of the pipe fitting after rotation due to the deviation of the path of the micro cylinder.

[0015] A further configuration of the present invention is that a plurality of balls are provided on the surface of the limiting groove for protecting the tube body when it rotates.

[0016] By adopting the above technical solution, since a plurality of balls are provided on the surface of the limiting groove for protecting the tube body when it rotates, the rotation of the tube is easier and the damage to the outer surface of the tube caused by the rotation can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 The present invention is a schematic diagram of the expanded structure of a device for synchronously and automatically detecting the depth of internal threads on both ends of a pipe according to a specific embodiment of the present invention.

[0018] Attached Figure 2 The present invention is a schematic structural diagram of a detection device in a device for synchronously and automatically detecting the depth of double-end internal threads of a pipe according to a specific embodiment of the present invention.

[0019] Attached Figure 3 It is a schematic diagram of the partial explosion structure of a detection device of a synchronous automatic detection equipment for the double-end internal thread depth of a pipe fitting according to a specific embodiment of the present invention.

[0020] Attached Figure 4 The exploded structural diagram of a clamping device and a pipe body rotating mechanism in a synchronous automatic detection device for the double-end internal thread depth of a pipe fitting according to a specific embodiment of the present invention.

[0021] 1-mounting seat, 2-detection device, 3-clamping device, 4-mounting plate, 5-position calibration mechanism, 6-driving cylinder, 7-connecting plate, 8-detection rod, 9-detection head, 10-elastic pressure plate, 11-compression spring, 12-mounting cover, 13-pressure sensor, 14-integrated computing unit, 15-digital display screen, 16-mounting slot, 17-movable hole, 18-mounting hole, 19-ball, 20-limiting plate, 21-clamping table, 22-movable rod, 23-sleeve rod, 24-tension spring, 25-clamping plate, 26-automatic lifting platform, 27-infrared sensor, 28-secondary detection device, 29-position sensor, 30-tube rotation mechanism, 31-micro cylinder, 32-strong friction clamping plate, 33-connecting block, 34-sliding notch, 35-lateral limit clamping plate, 36-limiting slot. DETAILED DESCRIPTION

[0022] like Figure 1-4 As shown, a synchronous automatic detection device for the depth of double-end internal threads of pipe fittings includes a mounting seat 1, a pair of detection devices 2 and a clamping device 3, wherein the clamping device is arranged on the mounting seat, the pair of detection devices are arranged on the mounting seat and are located on both sides of the clamping device, the pair of detection devices include a mounting plate 4, a position calibration mechanism 5, a driving cylinder 6, a connecting plate 7, a detection rod 8, a detection head 9, an elastic pressure plate 10, a compression spring 11, a mounting cover 12, a pressure sensor 13, an integrated computing unit 14 and a digital display screen 15, the position calibration mechanism is arranged on the mounting seat, the mounting plate is arranged on the position calibration mechanism, the driving cylinder is arranged on the mounting plate, the connecting plate and the driving cylinder are arranged on the mounting plate, and the connecting plate and the driving cylinder are arranged on the mounting seat. The piston rod is connected, the detection rod is arranged on the connecting plate, the detection rod is provided with a mounting groove 16 matching the mounting cover, the mounting cover is detachably connected to the mounting groove, the mounting cover is respectively provided with a movable hole 17 and a mounting hole 18 matching the detection head and the pressure sensor, the detection head is arranged in the movable hole and slides with the movable hole, the pressure sensor is fixedly arranged in the mounting hole, the elastic pressure plate is arranged in the mounting groove, the two side surfaces at the middle position of the elastic pressure plate are rotatably connected with the mounting groove, the compression spring is arranged on the elastic pressure plate at one end close to the detection head, the integrated computing unit and the digital display screen are both arranged on the mounting plate and connected to the pressure sensor.

[0023] When detecting the internal threads at both ends of a tubular part, the tubular part is placed on a clamping device for clamping. After clamping, the height of a pair of detection devices is adjusted through a position calibration mechanism so that the detection heads of a pair of detection devices are aligned with the inner circumference of the pipe fitting respectively. Then, the detection device is started, and the driving cylinder drives the detection rod to move toward the inside of the pipe fitting at a fixed speed. During the movement, the detection head jumps up and down on the teeth of the thread, thereby applying periodically changing pressure to the elastic pressure plate. The elastic pressure plate transfers the pressure to the pressure sensor. After passing through the full depth of the thread, the pressure no longer changes. At this time, the integrated calculation unit connected to the pressure sensor combines the number of pressure changes with the given speed of the driving cylinder to calculate the depth of the entire thread and display the calculation result on the digital display screen to complete the detection of the thread depth. Regardless of whether the threads at both ends are of different depths or sizes, an accurate depth value can be given through a single detection, which greatly improves the detection efficiency.

[0024] One end of the detection head is provided with a ball 19 for protecting the internal thread, and the other end is provided with a limit plate 20 for limiting the position in the movable hole.

[0025] Since one end of the detection head is provided with a ball for protecting the internal thread, and the other end is provided with a limit plate for limiting in the movable hole, the ball can reduce the pressure damage to the surface of the internal thread during detection.

[0026] The clamping device includes a clamping platform 21, a movable rod 22, a sleeve rod 23, a tension spring 24 and a pair of clamping plates 25. The sleeve rod is arranged on the clamping platform, the movable rod is arranged in the sleeve rod and slides with the sleeve rod, the tension spring is arranged in the sleeve rod and its two ends are respectively connected to the sleeve rod and the movable rod, and the pair of clamping plates are respectively arranged on the sleeve rod and the movable rod.

[0027] Because the clamping device includes a clamping platform, a movable rod, a sleeve rod, a tension spring, and a pair of clamping plates, the sleeve rod is arranged on the clamping platform, the movable rod is arranged in the sleeve rod and slides with the sleeve rod, the tension spring is arranged in the sleeve rod and its two ends are respectively connected to the sleeve rod and the movable rod, and the pair of clamping plates are respectively arranged on the sleeve rod and the movable rod. The pipe fitting is clamped by a pair of clamping plates and clamped by the tension spring, which makes clamping simple and will not damage the outer surface of the pipe fitting.

[0028] The position calibration mechanism includes an automatic lifting platform 26, a control unit and an infrared sensor 27. The automatic lifting platform is arranged on a mounting seat and is adjustably and movably connected to the mounting seat. The mounting plate is arranged on the automatic lifting platform. The infrared sensor is arranged on a connecting plate and its position matches that of the detection head. The control unit is respectively connected to the infrared sensor and the automatic lifting platform.

[0029] Since the position calibration mechanism includes an automatic lifting platform, a control unit and an infrared sensor, the automatic lifting platform is arranged on the mounting seat and is adjustably and movably connected to the mounting seat, the mounting plate is arranged on the automatic lifting platform, the infrared sensor is arranged on the connecting plate and its position matches the detection head, the control unit is respectively connected to the infrared sensor and the automatic lifting platform, after the pipe is clamped, the infrared sensor is started, at which time a part of the sensing rays is blocked by the detection head, when the detection head moves to a position flush with the inner diameter of the pipe as the automatic lifting platform rises and falls, another part of the sensing rays is blocked by the end face of the pipe, and the sensing rays are completely blocked, at which time the control unit controls the automatic lifting platform to stop operating, and the calibration of the position of the detection device is completed.

[0030] The detection rod and a pair of clamping plates are also provided with a secondary detection device 28, and the secondary detection device includes a pair of position sensors 29, a control unit and a tube body rotation mechanism 30. The pair of position sensors are respectively arranged on a pair of detection devices at positions located at the ends of the detection rod. The pair of position sensors are connected to the driving cylinder and the tube body rotation mechanism through the control unit. The tube body rotation mechanism includes a micro cylinder 31, a strong friction clamping plate 32 and a connecting block 33. The pair of clamping plates are both provided with sliding notches 34 matching the connecting blocks. The micro cylinder is arranged on the clamping plate, and the connecting block is arranged in the sliding notch and is respectively connected to the piston rods of the strong friction clamping plate and the micro cylinder.

[0031] Since the detection rod and a pair of clamping plates are also provided with a secondary detection device, the secondary detection device includes a pair of position sensors, a control unit and a tube body rotation mechanism, the pair of position sensors are respectively arranged on a pair of detection devices at positions located at the ends of the detection rods, the pair of position sensors are connected to the driving cylinder and the tube body rotation mechanism through the control unit, the tube body rotation mechanism includes a micro cylinder, a strong friction clamping plate and a connecting block, the pair of clamping plates are each provided with a sliding notch matching the connecting block, the micro cylinder is arranged on the clamping plate, the connecting block is arranged in the sliding notch and is respectively connected to the piston rods of the strong friction clamping plate and the micro cylinder, through a pair of strong friction The wiping clamp clamps the pipe fitting. When the detection rods at both ends are fully extended into the pipe fitting to complete the first thread depth detection, the detection rod continues to move until it reaches a pair of position sensor joints at the end of the detection rod. After the joint, the control unit controls the driving cylinder to stop working, and then controls the pipe body rotation mechanism to start operating. The micro cylinder drives the strong friction plate to move at a constant speed, driving the pipe fitting to rotate around the axis in situ at a certain angle. After the rotation of the pipe fitting is completed, the driving cylinder starts to recover at a constant speed. During the recovery process, the depth of the internal thread is measured again. When the detection rod is completely recovered, the integrated calculation unit combines the results of the two tests and eliminates the errors to obtain the final depth detection result, making the measurement more accurate.

[0032] The movable rod and the sleeve rod are further provided with transverse limiting clamps 35 , and the transverse limiting clamps are provided with limiting grooves 36 .

[0033] Since the movable rod and the sleeve rod are also provided with transverse limit clamps, the transverse limit clamps are all provided with limit grooves. By adding the transverse limit clamps, the pipe fittings can be kept parallel to the measuring device through the limit grooves when clamping. At the same time, the position of the pipe fittings can be kept stable during rotation through the limit grooves, avoiding the situation where the detection head touches the internal thread of the pipe fitting after rotation due to the deviation of the path of the micro cylinder.

[0034] A plurality of balls are arranged on the surface of the limiting groove for protecting the tube body when it rotates.

[0035] Since a plurality of balls are arranged on the surface of the limiting grooves for protecting the pipe body when it rotates, the pipe can be rotated more easily and the damage to the outer surface of the pipe due to the rotation can be reduced.

Claims

1. A synchronous automatic detection device for the depth of double-end internal threads of pipe fittings, comprising a mounting seat, a pair of detection devices and a clamping device, wherein the clamping device is arranged on the mounting seat, and the pair of detection devices are arranged on the mounting seat and located on both sides of the clamping device, characterized in that: The pair of detection devices include a mounting plate, a position calibration mechanism, a driving cylinder, a connecting plate, a detection rod, a detection head, an elastic pressure plate, a compression spring, a mounting cover, a pressure sensor, an integrated computing unit and a digital display screen. The position calibration mechanism is arranged on a mounting seat, the mounting plate is arranged on the position calibration mechanism, the driving cylinder is arranged on the mounting plate, the connecting plate is connected to the piston rod of the driving cylinder, the detection rod is arranged on the connecting plate, a mounting groove is provided on the detection rod and a mounting groove matching the mounting cover is provided, the mounting cover is detachably connected to the mounting groove, and a movable hole and a mounting hole matching the detection head and the pressure sensor are respectively provided on the mounting cover, the detection head is arranged in the movable hole and slidably cooperates with the movable hole, the pressure sensor is fixedly arranged in the mounting hole, the elastic pressure plate is arranged in the mounting groove, the two side surfaces at the middle position of the elastic pressure plate are rotatably connected to the mounting groove, the compression spring is arranged on one end of the elastic pressure plate close to the detection head, and the integrated computing unit and the digital display screen are both arranged on the mounting plate and connected to the pressure sensor.

2. According to the device for synchronous automatic detection of the depth of double-end internal threads of pipe fittings as claimed in claim 1, it is characterized by: One end of the detection head is provided with a ball for protecting the internal thread, and the other end is provided with a limit plate for limiting the position in the movable hole.

3. According to the device for synchronous automatic detection of the depth of double-end internal threads of pipe fittings as claimed in claim 1, it is characterized by: The clamping device includes a clamping platform, a movable rod, a sleeve rod, a tension spring and a pair of clamping plates. The sleeve rod is arranged on the clamping platform, the movable rod is arranged in the sleeve rod and slides with the sleeve rod, the tension spring is arranged in the sleeve rod and its two ends are respectively connected to the sleeve rod and the movable rod, and the pair of clamping plates are respectively arranged on the sleeve rod and the movable rod.

4. According to claim 1, a synchronous automatic detection device for the depth of double-end internal threads of pipe fittings is characterized by: The position calibration mechanism includes an automatic lifting platform, a control unit and an infrared sensor. The automatic lifting platform is arranged on a mounting seat and is adjustably and movably connected to the mounting seat. The mounting plate is arranged on the automatic lifting platform. The infrared sensor is arranged on a connecting plate and its position matches that of a detection head. The control unit is respectively connected to the infrared sensor and the automatic lifting platform.

5. According to claim 3, a synchronous automatic detection device for the depth of double-end internal threads of pipe fittings is characterized in that: The detection rod and a pair of clamping plates are also provided with a secondary detection device, and the secondary detection device includes a pair of position sensors, a control unit and a tube body rotation mechanism. The pair of position sensors are respectively arranged on a pair of detection devices at positions located at the ends of the detection rod. The pair of position sensors are connected to the driving cylinder and the tube body rotation mechanism through the control unit. The tube body rotation mechanism includes a micro cylinder, a strong friction clamping plate and a connecting block. The pair of clamping plates are both provided with sliding notches matching the connecting blocks. The micro cylinder is arranged on the clamping plate, and the connecting block is arranged in the sliding notch and is respectively connected to the piston rods of the strong friction clamping plate and the micro cylinder.

6. A synchronous automatic detection device for double-end internal thread depth of pipe fittings according to claim 3, characterized in that: The movable rod and the sleeve rod are also provided with transverse limiting clamps, and the transverse limiting clamps are provided with limiting grooves.

7. A synchronous automatic detection device for the depth of double-end internal threads of pipe fittings according to claim 6, characterized in that: A plurality of balls are arranged on the surface of the limiting groove for protecting the tube body when it rotates.

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