A screening device for measuring the inner diameter of pipe fittings

Abstract

A screening device for measuring the inner diameter of pipe fittings includes a control unit, a frame, a feeding unit, an inner diameter measuring unit, and a storage unit. The inner diameter measuring unit includes a measurement drive module and a measuring device. The measurement drive module controls the vertical displacement of the measuring device. The measuring device includes a support, a sorting bar, a pressure sensor, and a height measuring module. The sorting bar has a frustum-shaped structure that is smaller at the bottom and larger at the top. The sorting bar is adapted to the pipe opening of the pipe fitting. When the sorting bar is inserted into the pipe opening and contacts the inner edge of the opening, the pressure sensor changes pressure, and the measurement drive module controls the measuring device to stop moving downward. The height measuring module obtains the height position of the sorting bar and transmits the parameters to the control unit. The control unit determines the outer diameter of the sorting bar at that height position based on the height position of the sorting bar, and then measures the inner diameter of the pipe fitting.

Description

Technical Field

[0001] This invention belongs to the field of pipe fitting processing equipment, and specifically relates to a screening device for measuring the inner diameter of pipe fittings. Background Technology

[0002] Pipe fittings are common component structures in existing technologies, with extensive applications in basic mechanical equipment such as bearing sleeves. Existing technologies typically use visual sensors to scan the inner diameter of pipe fittings for classification. For example, CN217664765U discloses a detection and screening device for plastic pipe fittings with inserts, including a platform cabinet and a turntable. The platform cabinet is fixed with a drive mechanism for rotating the turntable. Along the rotation direction of the turntable, the platform cabinet sequentially includes: a guide port for allowing plastic pipe fittings with inserts to enter the turntable from the previous conveying mechanism; a guiding mechanism for adjusting the position of the plastic pipe fittings with inserts; a screening mechanism including an imaging component and a rejection component. The imaging component captures images of the products to determine their qualification, and the rejection component removes unqualified plastic pipe fittings with inserts from the turntable and places them into an unqualified turnover basket; and an export mechanism for exporting qualified plastic pipe fittings with inserts from the turntable and placing them into a qualified turnover basket. The detection and screening device of this application mainly has the function of visually identifying and screening qualified and unqualified products for plastic pipe fittings with inserts. It has a simple structure, saves costs, has minimal dependence on the environment, and is easy to install and operate.

[0003] However, the device has a complex structure and high cost. Its screening method requires scanning with a visual sensor and performing corresponding calculations to detect and reject pipe fittings based on their inner diameter, which cannot meet the requirements for screening large quantities of pipe fittings. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a screening device for measuring the inner diameter of pipe fittings:

[0005] A screening device for measuring the inner diameter of pipe fittings includes a control unit, a frame, a feeding unit, an inner diameter measuring unit, and a storage unit. The feeding unit, inner diameter measuring unit, and storage unit are all mounted on the frame and connected to the control unit.

[0006] The feeding unit includes a conveying module, a feeding channel, and a feeding channel. The feeding channel is connected to the feeding channel. The conveying module includes a feeding plate and a feeding drive device. The feeding plate has multiple open slots evenly distributed along the feeding channel direction on one side corresponding to the feeding channel. The open slots clamp suitable pipe fittings. The feeding drive device is used to control the feeding plate to move in the X or Y direction on the horizontal plane. The feeding drive device achieves the positioning and conveying of pipe fittings by controlling the feeding plate to make intermittent movements in the X and Y directions.

[0007] The inner diameter measuring unit includes a measuring drive module and a measuring device. The measuring drive module controls the vertical displacement of the measuring device. The measuring device includes a support, a sorting bar, a pressure sensor, and a height measuring module. The sorting bar is mounted on the support and has a frustum-shaped structure that is smaller at the bottom and larger at the top. The sorting bar is adapted to the pipe opening of the fitting. When the sorting bar is inserted into the pipe opening and contacts the inner edge of the opening, the pressure sensor changes pressure, and the measuring drive module controls the measuring device to stop moving downward. The height measuring module obtains the height position of the sorting bar and transmits the parameters to the control unit. The control unit determines the outer diameter of the sorting bar at that height position based on the height position of the sorting bar, and then measures the inner diameter of the fitting.

[0008] The material storage unit includes a screening module and a storage box. The storage box includes multiple isolated storage compartments. The screening module is used to separate the pipe fittings at the end of the feeding channel into different storage compartments.

[0009] Preferably, the upper end of the sorting bar is provided with a locking flange that protrudes radially outward. The locking flange and the locking slide cavity on the bracket form a limiting sliding fit. The locking slide cavity limits and supports the lower end face of the locking flange. The locking flange is adapted to a pressure sensor located at the upper end of the locking slide cavity. When the sorting bar contacts the inner edge of the tube opening and pushes the sorting bar upward, the locking flange abuts against the pressure sensor, and the pressure sensor transmits the signal to the control unit.

[0010] Preferably, the height measurement module includes a longitudinal straight guide rail, a guide wheel, and an encoder. The longitudinal straight guide rail is parallel to the sorting bar, and a bracket is fixedly connected to the upper end of the longitudinal straight guide rail. The longitudinal straight guide rail and the guide wheel form a meshing transmission. The guide wheel and the encoder are concentrically fixedly connected. When the longitudinal straight guide rail is axially displaced, it drives the guide wheel and the encoder to rotate. The encoder detects the signal and transmits the signal to the control computer. The control computer obtains the height position parameter of the sorting bar by the axial displacement of the longitudinal straight guide rail.

[0011] Preferably, it also includes a limiting rod parallel to the sorting bar, the upper end of the limiting rod is fixedly connected to the bracket, the limiting rod includes a lower movable rod part and a limiting rod part located above the movable rod part, the movable rod part and the frame are provided with a movable hole to form a sliding fit, the limiting rod part protrudes radially relative to the movable rod part, and the limiting rod part and the movable hole form a limiting fit.

[0012] Preferably, the measurement drive module includes a second stepper motor, a gear disposed at the end of the second stepper motor, and a longitudinal rack of meshing gear. The longitudinal rack is parallel to the sorting bar, and a bracket is fixedly connected to the upper end of the longitudinal rack. The second stepper motor is used to control the vertical displacement of the longitudinal rack.

[0013] Preferably, the measurement drive module includes a first stepper motor and a first lead screw that is driven and connected to the first stepper motor. The first lead screw is parallel to the sorting bar and is adapted to a through hole provided on the surface of the frame. The first stepper motor is driven and connected to the first lead screw to control the axial displacement of the first lead screw, and the first lead screw is used to control the vertical displacement of the support.

[0014] Preferably, there is a corner of 60° to 120° between the feeding channel and the conveying channel. An infrared sensor is provided above the corner. When the pipe moves to the corner, the infrared sensor monitors the pipe and transmits the signal to the controller. The controller controls the feeding plate to drive the pipe into the conveying channel.

[0015] Preferably, the screening module includes a longitudinal displacement module, a screening table, and two thrust devices respectively disposed at both ends of the screening table. The longitudinal displacement module is used to control the longitudinal displacement of the screening table. The screening table includes a front platform and a conveyor belt device parallel to the front platform. The conveyor belt device is located near the storage bin and is used to control the horizontal left and right movement of the pipe fittings. The thrust device includes a thrust cylinder, a thrust rod connected to the thrust cylinder, and a thrust plate disposed at the outer end of the thrust rod. The thrust plate is used to push the pipe fittings on the screening table into the storage bin.

[0016] Preferably, both ends of the front platform are provided with baffles, and the two baffles extend to one side of the corresponding conveyor belt device. The baffles are used to prevent the pipes from sliding off the sides of the screening table.

[0017] Preferably, the longitudinal displacement module includes a longitudinal lead screw disposed in the middle of the storage box, a screening motor that drives and connects to the longitudinal lead screw, two longitudinal slide rods parallel to the longitudinal lead screw, and a connecting plate that is fixedly connected to the front platform. The connecting plate is provided with a threaded hole that is threaded to the longitudinal lead screw and a sliding hole that is threaded to the slide rod. The screening motor is used to control the longitudinal displacement of the screening table through the lead screw and the connecting plate.

[0018] Beneficial effects: This application uses a sorting bar inserted into the pipe opening. When the sorting bar contacts the inner edge of the pipe opening, the pressure sensor changes pressure. The controller can determine the inner diameter of the pipe opening by the height position of the sorting bar when it contacts the pipe. Then, the pipe is sorted and stored through the storage unit. This is convenient and fast and can be widely used in the screening of large batches of pipes. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of Example 1. Figure 1 .

[0020] Figure 2 This is a schematic diagram of the structure of Example 1. Figure 2 .

[0021] Figure 3 This is a top view of Example 1.

[0022] Figure 4 This is a schematic diagram showing the connection between the sorting bar and the support.

[0023] Reference numerals: 1. Control unit; 2. Frame; 3. Feeding channel; 4. Feeding channel; 5. Feeding plate; 51. Opening slot; 6. Support; 61. Positioning cavity; 7. Sorting bar; 71. Positioning flange; 8. Pressure sensor; 9. Height measurement module; 91. Longitudinal guide rail; 92. Encoder; 10. Limiting rod; 11. First lead screw; 12. Infrared sensor; 13. Front platform; 14. Conveyor belt device; 15. Thrust device; 16. Baffle; 17. Longitudinal lead screw; 18. Screening motor; 19. Connecting plate; 20. Pipe fitting. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-4 The present invention will be further described with reference to Examples 1-2.

[0025] Example 1: As Figure 1 The aforementioned screening equipment for measuring the inner diameter of pipe fitting 20 includes a control unit 1, a frame 2, a feeding unit, an inner diameter measuring unit, and a storage unit. The feeding unit, the inner diameter measuring unit, and the storage unit are all mounted on the frame 2, and are all connected to the control unit 1.

[0026] like Figure 1 As shown, the feeding unit includes a conveying module, a feeding channel 3, and a feeding channel 4. The feeding channel 3 connects to the feeding channel 4. The conveying module includes a feeding plate 5 and a feeding drive device. The feeding plate 5 has multiple open slots 51 evenly distributed along the direction of the feeding channel 4 on one side corresponding to the feeding channel 4. The open slots 51 clamp the fitting pipe 20. The feeding drive device controls the feeding plate 5 to move in the X or Y direction on the horizontal plane. The feeding drive device achieves the positioning and conveying of the pipe 20 by controlling the feeding plate 5 to make intermittent movements in the X and Y directions. There is a corner with a 60° to 120° angle between the feeding channel 3 and the feeding channel 4. An infrared sensor 12 is provided above the corner. When the pipe 20 moves to the corner, the infrared sensor 12 monitors the pipe 20 and transmits the signal to the controller 1. The controller 1 controls the feeding plate 5 to drive the pipe 20 into the feeding channel 4. The feeding channel 3 includes two parallel first limiting bars, which limit the movement of the conveyed pipe fitting 20. The feeding channel 4 includes a second limiting bar. The intermittent X-axis and Y-axis movements described in this embodiment are as follows: Figure 1The feeding plate 5 is close to the feeding channel 4. After clamping and positioning the pipe 20 through the opening groove and the second limiting strip of the feeding plate 5, it moves along the direction of the feeding channel 4 and then moves away from the feeding channel 4 to release the pipe 20. The process is repeated. The overall movement trajectory of the feeding plate 5 is a square moving structure.

[0027] The inner diameter measuring unit includes a measuring drive module and a measuring device. The measuring drive module is used to control the vertical displacement of the measuring device. The measuring drive module includes a first stepper motor and a first lead screw 11 that is driven and connected to the first stepper motor. The first lead screw 11 is parallel to the sorting bar 7 and is adapted to a through hole provided on the surface of the frame 2. The first stepper motor is driven and connected to the first lead screw 11 to control the axial displacement of the first lead screw 11. The first lead screw 11 is used to control the vertical displacement of the support 6.

[0028] The measuring device includes a bracket 6, a sorting rod 7, a pressure sensor 8, a height measuring module 9, and a limiting rod 10 parallel to the sorting rod 7. The sorting rod 7 is mounted on the bracket 6 and has a frustum-shaped structure, smaller at the bottom and larger at the top. The sorting rod 7 is adapted to the opening of the pipe fitting 20. When the sorting rod 7 is inserted into the opening and contacts the inner edge of the opening, the pressure sensor 8 experiences a pressure change, and the measuring drive module controls the measuring device to stop moving downwards. The height measuring module 9 obtains the height position of the sorting rod 7 and transmits the parameters to the control unit 1. The control unit 1 determines the outer diameter of the sorting rod 7 at that height position, and thus measures the inner diameter of the pipe fitting 20. Figure 4 As shown, the upper end of the sorting bar 7 is provided with a locking flange 71 that protrudes radially outward. The locking flange 71 and the locking slide cavity 61 provided on the bracket 6 form a limiting sliding fit. The locking slide cavity 61 limits and supports the lower end face of the locking flange 71. The locking flange 71 is adapted to the pressure sensor 8 located at the upper end of the locking slide cavity 61. When the sorting bar 7 contacts the inner edge of the tube opening and causes the sorting bar 7 to push upward, the locking flange 71 abuts against the pressure sensor 8, and the pressure sensor 8 transmits the signal to the control unit 1.

[0029] The height measurement module 9 includes a longitudinal straight guide rail 91, a guide wheel, and an encoder 92. The longitudinal straight guide rail 91 is parallel to the sorting bar 7. A bracket 6 is fixedly connected to the upper end of the longitudinal straight guide rail 91. The longitudinal straight guide rail 91 and the guide wheel form a meshing transmission. The guide wheel and the encoder 92 are concentrically fixedly connected. When the longitudinal straight guide rail 91 is axially displaced, it drives the guide wheel and the encoder 92 to rotate. The encoder 92 detects the signal and transmits the signal to the controller 1. The controller 1 obtains the height position parameter of the sorting bar 7 by the axial displacement of the longitudinal straight guide rail 91.

[0030] The upper end of the limiting rod 10 is fixedly connected to the bracket 6. The limiting rod 10 includes a lower movable rod part and a limiting rod 10 part located above the movable rod part. The movable rod part and the frame 2 are provided with a movable hole to form a sliding fit. The limiting rod 10 part protrudes radially relative to the movable rod part, and the limiting rod 10 part and the movable hole form a limiting fit.

[0031] The storage unit includes a screening module and a storage box. The storage box includes multiple isolated storage compartments. The screening module is used to separate the pipe fittings 20 at the end of the feeding channel 4 into different storage compartments. The screening module includes a longitudinal displacement module, a screening table, and two thrust devices 15 respectively disposed at both ends of the screening table. The longitudinal displacement module is used to control the longitudinal displacement of the screening table. The screening table includes a front platform 13 and a conveyor belt device 14 parallel to the front platform 13. The conveyor belt device 14 is located near the storage compartment and is used to control the horizontal left and right movement of the pipe fittings 20. The thrust device 15 includes a thrust cylinder, a thrust rod connected to the thrust cylinder, and a thrust plate disposed at the outer end of the thrust rod. The thrust plate is used to push the pipe fittings 20 on the screening table into the storage compartments.

[0032] Both ends of the front platform 13 are provided with baffles 16, which extend to one side of the conveyor belt device 14. The baffles 16 are used to prevent the pipe 20 from sliding off both sides of the screening table. The longitudinal displacement module includes a longitudinal lead screw 17 located in the middle of the storage box, a screening motor 18 connected to the longitudinal lead screw 17, two longitudinal sliding rods parallel to the longitudinal lead screw 17, and a connecting plate 19 fixedly connected to the front platform 13. The connecting plate 19 is provided with threaded holes that are threaded to the longitudinal lead screw 17 and sliding holes that are threaded to the sliding rods. The screening motor 18 is used to control the longitudinal displacement of the screening table through the lead screw and the connecting plate 19.

[0033] Operating Principle: When the material pipe 20 enters the feed channel 3 and reaches the corner at the end of the feed channel 3, the infrared sensor 12 above the corner detects the presence of the pipe 20. The controller 1 controls the feeding plate 5 to approach the feed channel 4. After clamping and positioning the pipe 20 through the opening slot and the second limiting strip of the feeding plate 5, it moves along the direction of the feed channel 4, and then moves away from the feed channel 4 to release the pipe 20. The process is repeated. The overall movement trajectory of the feeding plate 5 is a square moving structure. When the pipe 20 moves to the set position and corresponds to the sorting bar 7, the controller 1 controls the sorting bar 7 to insert into the pipe opening and contact the inner edge of the pipe opening. The pressure sensor 8 on the top of the sorting bar 7 changes pressure, and the measurement drive module controls the measuring device to stop moving downward. The height measurement module 9 obtains the height position of the sorting bar 7 and transmits the parameters to the controller 1. The controller 1 determines the outer diameter of the sorting bar 7 at that height position, and then measures the inner diameter of the pipe 20.

[0034] Example 2: Figure 1 The aforementioned screening equipment for measuring the inner diameter of pipe fitting 20 includes a control unit 1, a frame 2, a feeding unit, an inner diameter measuring unit, and a storage unit. The feeding unit, the inner diameter measuring unit, and the storage unit are all mounted on the frame 2, and are all connected to the control unit 1.

[0035] like Figure 1 As shown, the feeding unit includes a conveying module, a feeding channel 3, and a feeding channel 4. The feeding channel 3 connects to the feeding channel 4. The conveying module includes a feeding plate 5 and a feeding drive device. The feeding plate 5 has multiple open slots 51 evenly distributed along the direction of the feeding channel 4 on one side corresponding to the feeding channel 4. The open slots 51 clamp the fitting pipe 20. The feeding drive device controls the feeding plate 5 to move in the X or Y direction on the horizontal plane. The feeding drive device achieves the positioning and conveying of the pipe 20 by controlling the feeding plate 5 to make intermittent movements in the X and Y directions. There is a corner with a 60° to 120° angle between the feeding channel 3 and the feeding channel 4. An infrared sensor 12 is provided above the corner. When the pipe 20 moves to the corner, the infrared sensor 12 monitors the pipe 20 and transmits the signal to the controller 1. The controller 1 controls the feeding plate 5 to drive the pipe 20 into the feeding channel 4. The feeding channel 3 includes two parallel first limiting bars, which limit the movement of the conveyed pipe fitting 20. The feeding channel 4 includes a second limiting bar. The intermittent X-axis and Y-axis movements described in this embodiment are as follows: Figure 1 The feeding plate 5 is close to the feeding channel 4. After clamping and positioning the pipe 20 through the opening groove and the second limiting strip of the feeding plate 5, it moves along the direction of the feeding channel 4 and then moves away from the feeding channel 4 to release the pipe 20. The process is repeated. The overall movement trajectory of the feeding plate 5 is a square moving structure.

[0036] The inner diameter measuring unit includes a measuring drive module and a measuring device. The measuring drive module is used to control the vertical displacement of the measuring device. The measuring drive module includes a second stepper motor, a gear located at the end of the second stepper motor, and a longitudinal rack of meshing gear. The longitudinal rack is parallel to the sorting bar 7, and a bracket 6 is fixedly connected to the upper end of the longitudinal rack. The second stepper motor is used to control the vertical displacement of the longitudinal rack.

[0037] The measuring device includes a bracket 6, a sorting rod 7, a pressure sensor 8, a height measuring module 9, and a limiting rod 10 parallel to the sorting rod 7. The sorting rod 7 is mounted on the bracket 6 and has a frustum-shaped structure, smaller at the bottom and larger at the top. The sorting rod 7 is adapted to the pipe opening of the pipe fitting 20. When the sorting rod 7 is inserted into the pipe opening and contacts the inner edge of the opening, the pressure sensor 8 experiences a pressure change, and the measuring drive module controls the measuring device to stop moving downwards. The height measuring module 9 obtains the height position of the sorting rod 7 and transmits the parameter to the control unit 1. The control unit 1 determines the outer diameter of the sorting rod 7 at that height position based on the height position, thereby measuring the outer diameter of the pipe fitting 20. The inner diameter of 0; the upper end of the sorting bar 7 is provided with a radially protruding locking flange 71, the locking flange 71 and the locking slide cavity 61 provided on the bracket 6 form a limiting sliding fit, the locking slide cavity 61 limits and supports the lower end face of the locking flange 71, the locking flange 71 is adapted to the pressure sensor 8 provided in the upper end of the locking slide cavity 61, when the sorting bar 7 contacts the inner edge of the tube opening and causes the sorting bar 7 to push up, the locking flange 71 abuts against the pressure sensor 8, and the pressure sensor 8 transmits the signal to the control machine 1.

[0038] The height measurement module 9 includes a longitudinal straight guide rail 91, a guide wheel, and an encoder 92. The longitudinal straight guide rail 91 is parallel to the sorting bar 7. A bracket 6 is fixedly connected to the upper end of the longitudinal straight guide rail 91. The longitudinal straight guide rail 91 and the guide wheel form a meshing transmission. The guide wheel and the encoder 92 are concentrically fixedly connected. When the longitudinal straight guide rail 91 is axially displaced, it drives the guide wheel and the encoder 92 to rotate. The encoder 92 detects the signal and transmits the signal to the controller 1. The controller 1 obtains the height position parameter of the sorting bar 7 by the axial displacement of the longitudinal straight guide rail 91.

[0039] The upper end of the limiting rod 10 is fixedly connected to the bracket 6. The limiting rod 10 includes a lower movable rod part and a limiting rod 10 part located above the movable rod part. The movable rod part and the frame 2 are provided with a movable hole to form a sliding fit. The limiting rod 10 part protrudes radially relative to the movable rod part, and the limiting rod 10 part and the movable hole form a limiting fit.

[0040] The storage unit includes a screening module and a storage box. The storage box includes multiple isolated storage compartments. The screening module is used to separate the pipe fittings 20 at the end of the feeding channel 4 into different storage compartments. The screening module includes a longitudinal displacement module, a screening table, and two thrust devices 15 respectively disposed at both ends of the screening table. The longitudinal displacement module is used to control the longitudinal displacement of the screening table. The screening table includes a front platform 13 and a conveyor belt device 14 parallel to the front platform 13. The conveyor belt device 14 is located near the storage compartment and is used to control the horizontal left and right movement of the pipe fittings 20. The thrust device 15 includes a thrust cylinder, a thrust rod connected to the thrust cylinder, and a thrust plate disposed at the outer end of the thrust rod. The thrust plate is used to push the pipe fittings 20 on the screening table into the storage compartments.

[0041] Both ends of the front platform 13 are provided with baffles 16, which extend to one side of the conveyor belt device 14. The baffles 16 are used to prevent the pipe 20 from sliding off both sides of the screening table. The longitudinal displacement module includes a longitudinal lead screw 17 located in the middle of the storage box, a screening motor 18 connected to the longitudinal lead screw 17, two longitudinal sliding rods parallel to the longitudinal lead screw 17, and a connecting plate 19 fixedly connected to the front platform 13. The connecting plate 19 is provided with threaded holes that are threaded to the longitudinal lead screw 17 and sliding holes that are threaded to the sliding rods. The screening motor 18 is used to control the longitudinal displacement of the screening table through the lead screw and the connecting plate 19.

[0042] Obviously, the above embodiments of the present invention are merely illustrative examples and not intended to limit the implementation of the invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. However, these obvious variations or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A screening device for measuring the inner diameter of pipe fittings, characterized in that: It includes a control unit (1), a frame (2), a feeding unit, an inner diameter measuring unit, and a storage unit. The feeding unit, the inner diameter measuring unit, and the storage unit are all mounted on the frame (2), and the feeding unit, the inner diameter measuring unit, and the storage unit are all connected to the control unit (1). The feeding unit includes a conveying module, a feeding channel (3) and a feeding channel (4). The feeding channel (3) is connected to the feeding channel (4). The conveying module includes a feeding plate (5) and a feeding drive device. The feeding plate (5) has multiple open slots (51) evenly distributed along the direction of the feeding channel (4) on one side corresponding to the feeding channel (4). The open slots (51) clamp the fitting pipe (20). The feeding drive device is used to control the feeding plate (5) to move in the X or Y direction on the horizontal plane. The feeding drive device achieves the positioning and conveying of the pipe (20) by controlling the feeding plate (5) to make intermittent movements in the X and Y directions. The inner diameter measuring unit includes a measuring drive module and a measuring device. The measuring drive module is used to control the vertical displacement of the measuring device. The measuring device includes a bracket (6), a sorting rod (7), a pressure sensor (8), and a height measuring module (9). The sorting rod (7) is mounted on the bracket (6). The sorting rod (7) has a frustum structure with a smaller bottom and a larger top. The sorting rod (7) is adapted to the pipe opening provided by the pipe fitting (20). When the sorting rod (7) is inserted into the pipe opening and contacts the inner edge of the pipe opening, the pressure sensor (8) changes pressure. The measuring drive module controls the measuring device to stop moving downward. The height measuring module (9) obtains the height position of the sorting rod (7) and transmits the parameters to the control machine (1). The control machine (1) determines the outer diameter of the sorting rod (7) at that height position through the height position of the sorting rod (7), and then measures the inner diameter of the pipe fitting (20). The storage unit includes a screening module and a storage box. The storage box includes multiple isolated storage compartments. The screening module is used to separate the pipe fittings (20) at the end of the feeding channel (4) into different storage compartments. The upper end of the sorting rod (7) is provided with a radially protruding locking flange (71). The locking flange (71) and the locking slide cavity (61) on the bracket (6) form a limiting sliding fit. The locking slide cavity (61) limits and supports the lower end face of the locking flange (71). The locking flange (71) is adapted to the pressure sensor (8) located at the upper end of the locking slide cavity (61). When the sorting rod (7) contacts the inner edge of the pipe opening and pushes the sorting rod (7) upward, the locking flange (71) abuts against the pressure sensor (8). The pressure sensor (8) transmits the signal to the controller (1); the height measurement module (9) includes a longitudinal straight guide rail (91), a guide wheel and an encoder (92). The longitudinal straight guide rail (91) is parallel to the sorting bar (7). The upper end of the longitudinal straight guide rail (91) is fixedly connected to the bracket (6). The longitudinal straight guide rail (91) and the guide wheel form a meshing transmission. The guide wheel and the encoder (92) are concentrically fixedly connected. When the longitudinal straight guide rail (91) is axially displaced, it drives the guide wheel and the encoder (92) to rotate. The encoder (92) detects the signal and transmits the signal to the controller (1). The controller (1) obtains the height position parameter of the sorting bar (7) by the axial displacement of the longitudinal straight guide rail (91).

2. The screening device for measuring the inner diameter of pipe fittings according to claim 1, characterized in that: It also includes a limiting rod (10) parallel to the sorting bar (7). The upper end of the limiting rod (10) is fixedly connected to the bracket (6). The limiting rod (10) includes a lower movable rod part and a limiting rod (10) part located above the movable rod part. The movable rod part and the frame (2) are provided with a movable hole to form a sliding fit. The limiting rod (10) part protrudes radially relative to the movable rod part. The limiting rod (10) part and the movable hole form a limiting fit.

3. A screening device for measuring the inner diameter of pipe fittings according to claim 2, characterized in that: The measurement drive module includes a first stepper motor and a first lead screw (11) that is connected to the first stepper motor. The first lead screw (11) is parallel to the sorting bar (7). The first lead screw (11) is adapted to the through hole provided on the surface of the frame (2). The first stepper motor is connected to the first lead screw (11) to control the axial displacement of the first lead screw (11). The first lead screw (11) is used to control the vertical displacement of the support (6).

4. A screening device for measuring the inner diameter of pipe fittings according to claim 1, characterized in that: The measurement drive module includes a second stepper motor, a gear and a longitudinal rack of meshing gear located at the end of the second stepper motor. The longitudinal rack is parallel to the sorting bar (7), and a bracket (6) is fixedly connected to the upper end of the longitudinal rack. The second stepper motor is used to control the vertical displacement of the longitudinal rack.

5. A screening device for measuring the inner diameter of pipe fittings according to claim 1, characterized in that: There is a 60° to 120° corner between the feeding channel (3) and the feeding channel (4). An infrared sensor (12) is provided above the corner. When the pipe (20) moves to the corner, the infrared sensor (12) monitors the pipe (20) and transmits the signal to the controller (1). The controller (1) controls the feeding plate (5) to drive the pipe (20) into the feeding channel (4).

6. A screening device for measuring the inner diameter of pipe fittings according to claim 1, characterized in that: The screening module includes a longitudinal displacement module, a screening table, and two thrust devices (15) respectively set at both ends of the screening table. The longitudinal displacement module is used to control the longitudinal displacement of the screening table. The screening table includes a front platform (13) and a conveyor belt device (14) parallel to the front platform (13). The conveyor belt device (14) is close to the storage bin. The conveyor belt device (14) is used to control the horizontal left and right movement of the pipe (20). The thrust device (15) includes a thrust cylinder, a thrust rod connected to the thrust cylinder, and a thrust plate set at the outer end of the thrust rod. The thrust plate is used to push the pipe (20) on the screening table into the storage bin.

7. A screening device for measuring the inner diameter of pipe fittings according to claim 6, characterized in that: Both ends of the front platform (13) are provided with baffles (16), and the two baffles (16) extend to one side of the conveyor belt device (14). The baffles (16) are used to prevent the pipes (20) from sliding off the sides of the screening table.

8. A screening device for measuring the inner diameter of pipe fittings according to claim 6, characterized in that: The longitudinal displacement module includes a longitudinal lead screw (17) located in the middle of the storage box, a screening motor (18) connected to the longitudinal lead screw (17), two longitudinal slide rods parallel to the longitudinal lead screw (17), and a connecting plate (19) fixedly connected to the front platform (13). The connecting plate (19) is provided with a threaded hole that is threaded to the longitudinal lead screw (17) and a sliding hole that is threaded to the slide rods. The screening motor (18) is used to control the longitudinal displacement of the screening table through the lead screw and the connecting plate (19).

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