Screening equipment for measuring inner diameter of pipe fitting

Abstract

The material screening equipment for measuring the inner diameter of the pipe fitting comprises a control machine, a rack, a feeding unit, an inner diameter measuring unit and a material storage unit, the inner diameter measuring unit comprises a measuring driving module and a measuring device, and the measuring driving module is used for controlling the vertical displacement of the measuring device; the measuring device comprises a support, a sorting rod, a pressure sensor and a height measuring module, the sorting rod is of a big-end-down circular truncated cone structure, the sorting rod is matched with a pipe opening formed in the pipe fitting, when the sorting rod is inserted into the pipe opening and makes contact with the inner edge of the pipe opening, the pressure sensor changes in pressure, and the measuring driving module controls the measuring device to stop moving downwards; the height measuring module obtains the height position of the sorting rod and transmits parameters to the control machine, the control machine determines the outer diameter of the sorting rod at the height position according to the height position of the sorting rod, and then the inner diameter size of the pipe fitting is measured.

Description

Technical Field

[0001] The invention belongs to the field of pipe processing equipment, and in particular relates to a screening device for measuring the inner diameter of a pipe. Background Art

[0002] The pipe fitting structure belongs to the common part structure in the prior art, and is widely used in basic mechanical equipment such as bearing sleeves. In the prior art, visual sensors are usually used to scan the inner diameter of the pipe fittings to classify the pipe fittings. For example, CN217664765U discloses a detection and screening device for plastic pipe fittings with inserts, including a base cabinet and a turntable. The base cabinet is fixed with a driving mechanism for driving the turntable to rotate. The base cabinet is sequentially provided with the following along the rotation direction of the turntable: a guide port for allowing the plastic pipe fittings with inserts to enter the turntable from the previous conveying mechanism; a guide mechanism for adjusting the position of the plastic pipe fittings with inserts; a screening mechanism, including a shooting component and a rejection component. The shooting component is used to shoot the image of the product to determine whether the product is qualified, and the rejection component is used to remove the unqualified plastic pipe fittings with inserts from the turntable to make them enter the unqualified turnover basket; and an export mechanism is used to export the qualified plastic pipe fittings with inserts from the turntable to enter the qualified turnover basket. The detection and screening device of the present application mainly has the function of visually identifying plastic pipe fittings with inserts and screening out qualified products and unqualified products. 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 by visual sensors and corresponding calculations to detect and eliminate the inner diameter of pipes, which cannot meet the requirements for picking up large quantities of pipes. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a screening device for measuring the inner diameter of a pipe: A screening device for measuring the inner diameter of a pipe, comprising a control machine, a frame, a feeding unit, an inner diameter measuring unit, and a storage unit, wherein the feeding unit, the inner diameter measuring unit, and the storage unit are all arranged on the frame, and the feeding unit, the inner diameter measuring unit, and the storage unit are all connected to the control machine. 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 is provided with a plurality of open slots evenly arranged and distributed along the feeding channel on one side corresponding to the feeding channel, the open slots are clamped with matching pipe fittings, the feeding drive device is used to control the feeding plate to make X-direction or Y-direction displacement on the horizontal plane, and the feeding drive device realizes the positioning and conveying of the pipe fittings by controlling the feeding plate to make intermittent motion in the X-direction and the Y-direction; The inner diameter measuring unit includes a measuring drive module and a measuring device. The measuring drive module is used to control the up and down displacement of the measuring device. The measuring device includes a bracket, a sorting rod, a pressure sensor and a height measuring module. The sorting rod is installed on the bracket. The sorting rod is a truncated cone structure with a small bottom and a large top. The sorting rod is adapted to the pipe mouth provided on the pipe fitting. When the sorting rod is inserted into the pipe mouth and contacts the inner edge of the pipe mouth, 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 rod and transmits the parameters to the control machine. The control machine determines the outer diameter of the sorting rod at the height position through the height position of the sorting rod, and then measures the inner diameter size of the pipe fitting. The material storage unit includes a screening module and a storage box, the storage box includes a plurality of mutually isolated storage bins, and the screening module is used to place the pipes at the ends of the feeding channel into different storage bins.

[0005] Preferably, the upper end of the sorting rod is provided with a locking flange protruding radially outward, and the locking flange and the locking slide cavity provided on the bracket constitute a limited sliding fit, and the locking slide cavity limits the lower end surface of the locking flange and supports the locking flange. The locking flange is adapted to a pressure sensor arranged at the upper end of the locking slide cavity. When the sorting rod contacts the inner edge of the pipe mouth so that the sorting rod is pushed up, the locking flange presses against the pressure sensor, and the pressure sensor transmits the signal to the control machine.

[0006] 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 rod. The upper end of the longitudinal straight guide rail is fixedly connected to a bracket. The longitudinal straight guide rail and the guide wheel constitute an engaging transmission. The guide wheel is concentrically and fixedly connected to the encoder. When the longitudinal straight guide rail is axially displaced, the guide wheel and the encoder are driven to rotate. The encoder detects the signal and transmits the signal to the control machine. The control machine obtains the height position parameters of the sorting rod through the axial displacement of the longitudinal straight guide rail.

[0007] Preferably, it also includes a limiting rod parallel to the sorting rod, the upper end of the limiting rod is fixedly connected to the bracket, the limiting rod includes a movable rod portion at the bottom and a limiting rod portion located above the movable rod portion, the movable rod portion and the frame are provided with a movable hole to form a sliding fit, the limiting rod portion is radially protruded relative to the movable rod portion, and the limiting rod portion and the movable hole form a limiting fit.

[0008] Preferably, the measurement drive module includes a second stepper motor, a gear arranged at the end of the second stepper motor and a longitudinal gear rod meshing with the gear, the longitudinal gear rod is parallel to the sorting rod, the upper end of the longitudinal gear rod is fixedly connected to the bracket, and the second stepper motor is used to control the up and down displacement of the longitudinal gear rod.

[0009] Preferably, the measurement drive module includes a first stepper motor and a first screw rod that is transmission-connected to the first stepper motor, the first screw rod is parallel to the sorting rod, the first screw rod is adapted to a through hole provided on the surface of the frame, the first stepper motor is transmission-connected to the first screw rod to control the axial displacement of the first screw rod, and the first screw rod is used to control the up and down displacement of the bracket.

[0010] Preferably, a corner of 60° to 120° is provided between the feed channel and the feeding channel, and an infrared sensing sensor is provided above the corner. When the pipe moves to the corner, the infrared sensing sensor monitors the pipe and transmits the signal to the control machine, and the control machine controls the feeding plate to drive the pipe into the feeding channel.

[0011] Preferably, the screening module includes a longitudinal displacement module, a screening platform and two thrust devices respectively arranged at both ends of the screening platform, the longitudinal displacement module is used to control the longitudinal displacement of the screening platform, the screening platform includes a front platform and a conveyor belt device parallel to the front platform, the conveyor belt device is close to one side of the storage bin, the conveyor belt device 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 arranged at the outer end of the thrust rod, and the thrust plate is used to push the pipe fittings on the screening platform into the storage bin.

[0012] Preferably, baffles are provided at both ends of the front platform, and the two baffles extend corresponding to one side of the conveyor belt device, and the baffles are used to prevent the pipes from sliding off the two sides of the screening platform.

[0013] Preferably, the longitudinal displacement module includes a longitudinal screw rod arranged in the middle of the storage box, a screening motor connected to the longitudinal screw rod, two longitudinal sliding rods parallel to the longitudinal screw rod and a connecting plate fixedly connected to the front platform, the connecting plate is provided with a threaded hole adapted to the thread of the longitudinal screw rod and a sliding hole adapted to the sliding rod, and the screening motor is used to control the longitudinal displacement of the screening platform through the screw rod and the connecting plate.

[0014] Beneficial effect: In the present application, a sorting rod is inserted into the pipe mouth of the pipe fitting. When the sorting rod is inserted into the pipe mouth and contacts the inner edge of the pipe mouth, the pressure sensor generates a pressure change. The control machine can judge the inner diameter of the pipe mouth by the height position where the sorting rod stays when contacting, and then the pipe fittings are screened and stored through the storage unit. This is convenient and fast and can be widely used in the screening and workmanship of large quantities of pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The structure of Example 1 is shown in FIG. Figure 1 .

[0016] Figure 2 The structure of Example 1 is shown in FIG. Figure 2 .

[0017] Figure 3 It is a top view schematic diagram of Example 1.

[0018] Figure 4 Schematic diagram of the connection between the sorting rod and the bracket.

[0019] Figure numerals: 1. Control machine; 2. Frame; 3. Feed channel; 4. Feeding channel; 5. Feeding plate; 51. Opening slot; 6. Bracket; 61. Positioning slide cavity; 7. Sorting rod; 71. Positioning flange; 8. Pressure sensor; 9. Height measurement module; 91. Longitudinal straight guide rail; 92. Encoder; 10. Limit rod; 11. First screw rod; 12. Infrared sensing sensor; 13. Front platform; 14. Conveyor belt device; 15. Thrust device; 16. Baffle; 17. Longitudinal screw rod; 18. Screening motor; 19. Connecting plate; 20. Pipe fittings. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-4 The present invention is further described with Examples 1-2.

[0021] Example 1: Figure 1 The screening device for measuring the inner diameter of a pipe 20 comprises a control machine 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 arranged on the frame 2, and the feeding unit, the inner diameter measuring unit, and the storage unit are all connected to the control machine 1.

[0022] like Figure 1 As shown, the feeding unit includes a conveying module, a feed channel 3 and a feed channel 4. The feed channel 3 is connected to the feed channel 4. The conveying module includes a feed plate 5 and a feed drive device. The feed plate 5 is provided with a plurality of open slots 51 evenly arranged and distributed along the direction of the feed channel 4 on one side corresponding to the feed channel 4. The open slots 51 clamp the fittings 20. The feed drive device is used to control the feed plate 5 to move in the X direction or Y direction on the horizontal plane. The feed drive device realizes the positioning and conveying of the pipe 20 by controlling the feed plate 5 to make intermittent movements in the X direction and the Y direction. A corner of 60° to 120° is provided between the feed channel 3 and the feed 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 a signal to the control machine 1. The control machine 1 controls the feed plate 5 to drive the pipe 20 into the feed channel 4. The feed channel 3 includes two parallel first limit bars, and the two first limit bars limit the transported pipe 20. The feed channel 4 includes a second limit bar. The intermittent motion in the X-direction and the Y-direction described in this embodiment, such as Figure 1The feeding plate 5 shown is close to the feeding channel 4, and the pipe fitting 20 is clamped and positioned by the opening groove and the second limit strip of the feeding plate 5, and then moves along the feeding channel 4, and then moves away from the feeding channel 4 to release the pipe fitting 20, resets and repeats. The overall movement trajectory of the feeding plate 5 is a square moving structure.

[0023] The inner diameter measuring unit includes a measuring drive module and a measuring device. The measuring drive module is used to control the up and down displacement of the measuring device, and the measuring drive module includes a first stepper motor and a first screw rod 11 connected to the first stepper motor, the first screw rod 11 is parallel to the sorting rod 7, the first screw rod 11 is adapted to the through hole provided on the surface of the frame 2, the first stepper motor is connected to the first screw rod 11 to control the axial displacement of the first screw rod 11, and the first screw rod 11 is used to control the up and down displacement of the bracket 6.

[0024] The measuring device includes a bracket 6, a sorting rod 7, a pressure sensor 8, a height measuring module 9 and a limit rod 10 parallel to the sorting rod 7. The sorting rod 7 is installed on the bracket 6. The sorting rod 7 is a truncated cone structure with a small bottom and a large top. The sorting rod 7 is adapted to the pipe mouth provided on the pipe fitting 20. When the sorting rod 7 is inserted into the pipe mouth and contacts the inner edge of the pipe mouth, the pressure sensor 8 changes pressure, and the measurement 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 this height position through the height position of the sorting rod 7, and then measures the inner diameter size of the pipe fitting 20. Figure 4 As shown, the upper end of the sorting rod 7 is provided with a locking flange 71 which protrudes radially outward, and the locking flange 71 and the locking slide cavity 61 provided on the bracket 6 form a limited sliding fit, and the locking slide cavity 61 limits and supports the lower end surface of the locking flange 71, and the locking flange 71 is adapted to the pressure sensor 8 arranged at the upper end of the locking slide cavity 61. When the sorting rod 7 contacts the inner edge of the pipe mouth so that the sorting rod 7 is pushed up, the locking flange 71 presses against the pressure sensor 8, and the pressure sensor 8 transmits the signal to the control machine 1.

[0025] 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 rod 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 is concentrically fixedly connected to the encoder 92. When the longitudinal straight guide rail 91 is axially displaced, the guide wheel and the encoder 92 are driven to rotate. The encoder 92 detects the signal and transmits the signal to the control machine 1. The control machine 1 obtains the height position parameter of the sorting rod 7 through the axial displacement of the longitudinal straight guide rail 91.

[0026] The upper end of the limit rod 10 is fixedly connected to the bracket 6, and the limit rod 10 includes a movable rod portion at the bottom and a limit rod 10 portion located above the movable rod portion. The movable rod portion and the frame 2 are provided with a movable hole to form a sliding fit. The limit rod 10 portion is radially protruded relative to the movable rod portion, and the limit rod 10 portion and the movable hole form a limiting fit.

[0027] The storage unit includes a screening module and a storage box, the storage box includes a plurality of storage bins isolated from each other, the screening module is used to place the pipe fittings 20 at the end of the feeding channel 4 into different storage bins. The screening module includes a longitudinal displacement module, a screening table and two thrust devices 15 respectively arranged 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 one side of the storage bin, the conveyor belt device 14 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 arranged 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 bin.

[0028] Baffles 16 are provided at both ends of the front platform 13. The two baffles 16 extend corresponding to one side of the conveyor belt device 14. The baffles 16 are used to prevent the pipe fittings 20 from sliding off the two sides of the sub-screening platform. The longitudinal displacement module includes a longitudinal screw rod 17 arranged in the middle of the storage box, a sub-screening motor 18 connected to the longitudinal screw rod 17, two longitudinal sliding rods parallel to the longitudinal screw rod 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 threadedly adapted to the longitudinal screw rod 17 and a sliding hole that is adapted to the sliding rod. The sub-screening motor 18 is used to control the longitudinal displacement of the sub-screening platform through the screw rod and the connecting plate 19.

[0029] Operation principle: When the material pipe 20 enters the corner at the end of the feeding channel 3 from the feeding channel 3, the infrared sensor 12 above the corner detects the existence of the pipe 20, and the control machine 1 controls the feeding plate 5 to approach the feeding channel 4, and realizes the clamping and positioning of the pipe 20 through the opening groove and the second limit bar of the feeding plate 5, and then moves along the feeding channel 4, and then moves away from the feeding channel 4 to release the pipe 20, resets and repeats, and the overall movement trajectory of the feeding plate 5 presents a square moving structure. When the pipe 20 moves to the set position corresponding to the sorting rod 7, the control machine 1 controls the sorting rod 7 to insert into the pipe mouth and contact the inner edge of the pipe mouth, the pressure sensor 8 on the sorting rod 7 changes, the measurement drive module controls the measuring device to stop moving down, and the height measurement 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 this height position through the height position of the sorting rod 7, and then measures the inner diameter size of the pipe 20.

[0030] Example 2: Figure 1 The screening device for measuring the inner diameter of a pipe 20 comprises a control machine 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 arranged on the frame 2, and the feeding unit, the inner diameter measuring unit, and the storage unit are all connected to the control machine 1.

[0031] like Figure 1 As shown, the feeding unit includes a conveying module, a feed channel 3 and a feed channel 4. The feed channel 3 is connected to the feed channel 4. The conveying module includes a feed plate 5 and a feed drive device. The feed plate 5 is provided with a plurality of open slots 51 evenly arranged and distributed along the direction of the feed channel 4 on one side corresponding to the feed channel 4. The open slots 51 clamp the fittings 20. The feed drive device is used to control the feed plate 5 to move in the X direction or Y direction on the horizontal plane. The feed drive device realizes the positioning and conveying of the pipe 20 by controlling the feed plate 5 to make intermittent movements in the X direction and the Y direction. A corner of 60° to 120° is provided between the feed channel 3 and the feed 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 a signal to the control machine 1. The control machine 1 controls the feed plate 5 to drive the pipe 20 into the feed channel 4. The feed channel 3 includes two parallel first limit bars, and the two first limit bars limit the transported pipe 20. The feed channel 4 includes a second limit bar. The intermittent motion in the X-direction and the Y-direction described in this embodiment, such as Figure 1 The feeding plate 5 shown is close to the feeding channel 4, and the pipe fitting 20 is clamped and positioned by the opening groove and the second limit strip of the feeding plate 5, and then moves along the feeding channel 4, and then moves away from the feeding channel 4 to release the pipe fitting 20, resets and repeats. The overall movement trajectory of the feeding plate 5 is a square moving structure.

[0032] The inner diameter measuring unit includes a measuring drive module and a measuring device. The measuring drive module is used to control the up and down displacement of the measuring device, and includes a second stepping motor, a gear disposed at the end of the second stepping motor, and a longitudinal gear rod meshing with the gear, wherein the longitudinal gear rod is parallel to the sorting rod 7, the upper end of the longitudinal gear rod is fixedly connected to the bracket 6, and the second stepping motor is used to control the up and down displacement of the longitudinal gear rod.

[0033] The measuring device includes a bracket 6, a sorting rod 7, a pressure sensor 8, a height measuring module 9 and a limit rod 10 parallel to the sorting rod 7. The sorting rod 7 is installed on the bracket 6. The sorting rod 7 is a truncated cone structure with a small bottom and a large top. The sorting rod 7 is adapted to the pipe opening provided on 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, and the measurement 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 the height position through the height position of the sorting rod 7, and then measures the outer diameter of the pipe fitting 20. 0 inner diameter size; the upper end of the sorting rod 7 is provided with a locking flange 71 which radially protrudes outward, and the locking flange 71 and the locking slide cavity 61 provided on the bracket 6 constitute a limited sliding fit, and the locking slide cavity 61 limits the support of the lower end surface of the locking flange 71, and the locking flange 71 is adapted to the pressure sensor 8 arranged at the upper end of the locking slide cavity 61. When the sorting rod 7 contacts the inner edge of the pipe mouth so that the sorting rod 7 is pushed up, the locking flange 71 presses against the pressure sensor 8, and the pressure sensor 8 transmits the signal to the control machine 1.

[0034] 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 rod 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 is concentrically fixedly connected to the encoder 92. When the longitudinal straight guide rail 91 is axially displaced, the guide wheel and the encoder 92 are driven to rotate. The encoder 92 detects the signal and transmits the signal to the control machine 1. The control machine 1 obtains the height position parameter of the sorting rod 7 through the axial displacement of the longitudinal straight guide rail 91.

[0035] The upper end of the limit rod 10 is fixedly connected to the bracket 6, and the limit rod 10 includes a movable rod portion at the bottom and a limit rod 10 portion located above the movable rod portion. The movable rod portion and the frame 2 are provided with a movable hole to form a sliding fit. The limit rod 10 portion is radially protruded relative to the movable rod portion, and the limit rod 10 portion and the movable hole form a limiting fit.

[0036] The storage unit includes a screening module and a storage box, the storage box includes a plurality of storage bins isolated from each other, the screening module is used to place the pipe fittings 20 at the end of the feeding channel 4 into different storage bins. The screening module includes a longitudinal displacement module, a screening table and two thrust devices 15 respectively arranged 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 one side of the storage bin, the conveyor belt device 14 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 arranged 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 bin.

[0037] Baffles 16 are provided at both ends of the front platform 13. The two baffles 16 extend corresponding to one side of the conveyor belt device 14. The baffles 16 are used to prevent the pipe fittings 20 from sliding off the two sides of the sub-screening platform. The longitudinal displacement module includes a longitudinal screw rod 17 arranged in the middle of the storage box, a sub-screening motor 18 connected to the longitudinal screw rod 17, two longitudinal sliding rods parallel to the longitudinal screw rod 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 threadedly adapted to the longitudinal screw rod 17 and a sliding hole that is adapted to the sliding rod. The sub-screening motor 18 is used to control the longitudinal displacement of the sub-screening platform through the screw rod and the connecting plate 19.

[0038] Obviously, the above embodiments of the present invention are merely examples for illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to exhaust all implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A screening device for measuring the inner diameter of a pipe, characterized in that: The invention comprises a control machine (1), a frame (2), a feeding unit, an inner diameter measuring unit, and a material storage unit, wherein the feeding unit, the inner diameter measuring unit, and the material storage unit are all arranged on the frame (2), and the feeding unit, the inner diameter measuring unit, and the material storage unit are all connected to the control machine (1). The feeding unit comprises 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 comprises a feeding plate (5) and a feeding drive device; a side of the feeding plate (5) corresponding to the feeding channel (4) is provided with a plurality of open slots (51) evenly arranged and distributed along the direction of the feeding channel (4); the open slots (51) are clamped with the fittings (20); the feeding drive device is used to control the feeding plate (5) to make an X-direction or Y-direction displacement on a horizontal plane; the feeding drive device realizes the positioning and conveying of the fittings (20) by controlling the feeding plate (5) to make an intermittent motion in the X-direction and the Y-direction; The inner diameter measuring unit comprises a measuring drive module and a measuring device. The measuring drive module is used to control the up and down displacement of the measuring device. The measuring device comprises 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) is a truncated cone structure with a small bottom and a large top. The sorting rod (7) is adapted to a pipe mouth provided on the pipe fitting (20). When the sorting rod (7) is inserted into the pipe mouth and contacts the inner edge of the pipe mouth, the pressure sensor (8) changes pressure, and 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 parameter to the control machine (1). The control machine (1) determines the outer diameter of the sorting rod (7) at the height position according to the height position of the sorting rod (7), and then measures the inner diameter size of the pipe fitting (20). The material storage unit comprises a screening module and a storage box, wherein the storage box comprises a plurality of mutually isolated storage bins, and the screening module is used to place the pipe fittings (20) at the end of the feeding channel (4) into different storage bins.

2. A screening device for measuring the inner diameter of a pipe according to claim 1, characterized in that: The upper end of the sorting rod (7) is provided with a positioning flange (71) protruding radially outward, and the positioning flange (71) and the positioning slide cavity (61) provided on the bracket (6) form a limited sliding fit, and the positioning slide cavity (61) supports the lower end surface of the positioning flange (71) in a limited manner, and the positioning flange (71) is adapted to a pressure sensor (8) arranged at the upper end of the positioning slide cavity (61). When the sorting rod (7) contacts the inner edge of the pipe mouth so that the sorting rod (7) is pushed up, the positioning flange (71) presses against the pressure sensor (8), and the pressure sensor (8) transmits a signal to the control machine (1).

3. A screening device for measuring the inner diameter of a pipe according to claim 1, characterized in that: The height measurement module (9) comprises a longitudinal straight guide rail (91), a guide wheel and an encoder (92); the longitudinal straight guide rail (91) is parallel to the sorting rod (7); the upper end of the longitudinal straight guide rail (91) is fixedly connected to a 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, the guide wheel and the encoder (92) are driven to rotate; the encoder (92) detects a signal and transmits the signal to a control machine (1); the control machine (1) obtains a height position parameter of the sorting rod (7) through the axial displacement of the longitudinal straight guide rail (91).

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

5. A screening device for measuring the inner diameter of a pipe according to claim 4, characterized in that: The measuring drive module comprises a first stepper motor and a first screw rod (11) which is transmission-connected to the first stepper motor, the first screw rod (11) being parallel to the sorting rod (7), the first screw rod (11) being adapted to a through hole provided on the surface of the frame (2), the first stepper motor being transmission-connected to the first screw rod (11) being used to control the axial displacement of the first screw rod (11), and the first screw rod (11) being used to control the up and down displacement of the bracket (6).

6. The screening device for measuring the inner diameter of a pipe according to claim 1, characterized in that: The measuring drive module comprises a second stepping motor, a gear arranged at the end of the second stepping motor and a longitudinal gear rod meshing with the gear, the longitudinal gear rod is parallel to the sorting rod (7), the upper end of the longitudinal gear rod is fixedly connected to the bracket (6), and the second stepping motor is used to control the up and down displacement of the longitudinal gear rod.

7. The screening device for measuring the inner diameter of a pipe according to claim 1, characterized in that: A corner with a range of 60° to 120° is provided between the feed channel (3) and the feeding channel (4), and an infrared sensing sensor (12) is provided above the corner. When the pipe (20) moves to the corner, the infrared sensing sensor (12) monitors the pipe (20) and transmits a signal to the control machine (1). The control machine (1) controls the feeding plate (5) to drive the pipe (20) to enter the feeding channel (4).

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

9. The screening device for measuring the inner diameter of a pipe according to claim 8, characterized in that: Baffles (16) are provided at both ends of the front platform (13), and the two baffles (16) extend corresponding to one side of the conveyor belt device (14). The baffles (16) are used to prevent the pipe fittings (20) from sliding off the two sides of the screening platform.

10. The screening device for measuring the inner diameter of a pipe according to claim 8, characterized in that: The longitudinal displacement module comprises a longitudinal screw rod (17) arranged in the middle of the storage box, a screening motor (18) connected to the longitudinal screw rod (17), two longitudinal sliding rods parallel to the longitudinal screw rod (17) and a connecting plate (19) fixedly connected to the front platform (13), wherein the connecting plate (19) is provided with a threaded hole adapted to form a thread with the longitudinal screw rod (17) and a sliding hole adapted to the sliding rod, and the screening motor (18) is used to control the longitudinal displacement of the screening platform through the screw rod and the connecting plate (19).

Images