A stainless steel pipe detection device

Abstract

This invention belongs to the field of other special equipment manufacturing technology, specifically a stainless steel pipe testing device, including a material rack, two sets of limiting plates, and two sets of drive mechanisms. The two sets of limiting plates and the two sets of drive mechanisms are symmetrically installed on the material rack. A support frame is provided at one end of the material rack, and a lead screw is rotatably installed on the support frame. The lead screw is screwed to a movable frame, and two sets of testing arms are installed on the movable frame. An internal cavity scanner and an external wall scanner are respectively installed on the two sets of testing arms. The drive mechanism includes two sets of synchronous shafts, which are rotatably installed on the material rack. A rotating wheel is installed at one end of the synchronous shaft. Through the cooperation of the two sets of limiting plates and the two sets of drive mechanisms, it is more convenient for workers to pick up and put down steel pipes, improving the efficiency of steel pipe testing. Secondly, the synchronous disc rotates with the friction of the steel pipe end face, which greatly reduces the obstruction of the limiting plates to the rotation of the steel pipe, ensuring the accuracy of steel pipe testing.

Description

Technical Field

[0001] This invention belongs to the field of other special equipment manufacturing technology, specifically a stainless steel pipe testing device. Background Technology

[0002] Steel pipes are classified by material into carbon structural steel pipes, low alloy structural steel pipes, alloy steel pipes, and composite steel pipes. Stainless steel pipes are a type of alloy steel pipe. During the production and processing of stainless steel pipes, it is necessary to measure the parameters of the inner and outer rings to ensure that the produced stainless steel pipes meet the application standards. Currently, the parameters of the inner and outer rings of stainless steel pipes are generally measured by laser scanners.

[0003] Patent CN117029718A discloses a precision steel pipe testing device, including a rolling mechanism, an inner cavity scanning mechanism, and an outer wall scanning mechanism. The rolling mechanism includes two sets of rotating shafts and two sets of sleeves. The inner cavity scanning mechanism includes an inner cavity scanner, and the outer wall scanning mechanism includes an outer wall scanner. This solution involves placing the steel pipe to be tested on the rolling mechanism and fitting it onto the inner cavity scanning mechanism. The inner cavity scanning mechanism scans the inner wall of the steel pipe to obtain inner wall data, and the outer wall scanning mechanism obtains data on the outer surface and port. By using a three-dimensional scanning method, the steel pipe data is obtained, thus intuitively deriving the steel pipe parameters and ensuring that each section of the steel pipe meets the usage standards.

[0004] In the above-mentioned scheme, when placing the steel pipe to be tested, it is necessary to fit the steel pipe to be tested onto the inner cavity scanning mechanism, then rotate the T-block to set it vertically, insert the limiting piece into the limiting groove, and then fix the limiting piece to the block with bolts. This makes it very inconvenient for the staff to pick up and put down the steel pipe, thereby reducing the detection efficiency of the steel pipe. Therefore, the present invention provides a stainless steel pipe detection device. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: A stainless steel pipe detection device of the present invention includes a material rack, two sets of limiting plates, and two sets of driving mechanisms. The two sets of limiting plates and the two sets of driving mechanisms are symmetrically installed on the material rack. A support frame is provided at one end of the material rack. A lead screw is rotatably installed on the support frame. The lead screw is screwed to a movable frame. Two sets of detection arms are installed on the movable frame. An internal cavity scanner and an external wall scanner are respectively installed on the two sets of detection arms. The driving mechanism includes two sets of synchronous shafts. The synchronous shafts are rotatably installed on the material rack. A rotating wheel is installed on one end of the synchronous shaft. A pulley is installed on the other end of the synchronous shaft. Both sets of pulleys are rotatably connected to a synchronous belt. A guide wheel for guiding the synchronous belt is rotatably installed on the material rack. A first motor for driving the drive wheel is fixedly installed on the material rack. The drive wheel is rotatably connected to the synchronous belt. A clearance groove for avoiding the detection arms is opened on the limiting plate. A bearing is embedded in the limiting plate. A synchronous disc is installed in the bearing.

[0007] By using two sets of limit plates and two sets of drive mechanisms, it is easier for staff to pick up and put down steel pipes, thus improving the efficiency of steel pipe inspection. Secondly, the synchronous disc rotates as the end face of the steel pipe rubs, which greatly reduces the obstruction of the limit plates to the rotation of the steel pipe and ensures the accuracy of steel pipe inspection.

[0008] Preferably, a feeding mechanism is provided at the rear of the material rack. The feeding mechanism includes two sets of conveyor frames, each with two sets of rotating shafts rotatably mounted on it. A drive arm is mounted on one end of the rotating shaft, and the two ends of the connecting shaft are respectively connected to the two sets of drive arms. The lower end of the connecting rod is hinged to the connecting shaft, and the upper end of the connecting rod is hinged to the material support frame. The other end of each set of rotating shafts is equipped with a synchronous pulley, and both sets of synchronous pulleys mesh with a transmission belt. The transmission belt meshes with a drive pulley. A second motor for driving the drive pulley is installed on one side of each set of conveyor frames. Several sets of discharge troughs for placing steel pipes are installed at equal intervals on the conveyor frames and the material support frame. A discharge frame for guiding the steel pipes is provided in front of the material rack.

[0009] After the steel pipe is inspected, the second motor is started again. The inspected steel pipe will be conveyed to the unloading rack by the material support frame and roll diagonally downward along the unloading rack to unload the steel pipe. The coordination between the feeding mechanism and the unloading rack enables automatic loading and unloading of steel pipes, improving the automation rate of the device.

[0010] Preferably, a correction mechanism is provided between the two sets of conveyor frames. The correction mechanism includes a movable plate, which is movably installed between the two sets of conveyor frames. Four sets of sliders are installed at the four corners of the movable plate. A connecting plate is movably installed on the sliders. A correction plate is fixedly connected to the connecting plate. A limiting plate is fixedly connected to one end of the correction plate. Two sets of rectangular slots are symmetrically opened on the conveyor frame. Guide posts are fixedly installed in the rectangular slots. The sliders pass through the rectangular slots and are slidably connected to the guide posts. Springs are sleeved on the guide posts. Three sets of through holes are opened on the correction plate. The through holes are slidably connected to the slide rods. One end of the slide rods is fixedly connected to the conveyor frame. A pin is installed on the slider. An inclined groove is opened at the lower end of the connecting plate. The pin is located in the inclined groove. A roller for squeezing the movable plate is rotatably installed at one end of the drive arm.

[0011] After the steel pipe is placed between the two sets of limiting plates, the rotating drive arm drives the roller to squeeze the movable plate again until the drive arm is perpendicular to the movable plate. During this process, the two sets of correction plates move towards each other, so that the distance between the two sets of correction plates and the two sets of limiting plates is equal to the length of the steel pipe, thereby correcting the position of the steel pipe and ensuring the accuracy of the steel pipe inspection.

[0012] The beneficial effects of this invention are as follows:

[0013] 1. By using two sets of limit plates and two sets of drive mechanisms, it is more convenient for workers to pick up and put down steel pipes, which improves the efficiency of steel pipe inspection. Secondly, the synchronous disc rotates with the friction of the steel pipe end face, which greatly reduces the obstruction of the limit plate to the rotation of the steel pipe and ensures the accuracy of steel pipe inspection.

[0014] 2. Start the second motor. The second motor drives the drive wheel to rotate. The drive wheel drives two sets of synchronous pulleys to rotate via a transmission belt. The synchronous pulleys drive the rotating shaft and drive arm to rotate. The drive arm drives another set of drive arms to rotate together via a connecting shaft. The rotating drive arm drives the connecting rod to rotate the material support frame. During the rotation of the material support frame, the feeding trough on the material support frame will lift the steel pipe, move the steel pipe forward, and place the steel pipe into the adjacent feeding trough on the conveyor frame or between two sets of limit plates, realizing the feeding of the steel pipe. After the steel pipe is inspected, start the second motor again. The inspected steel pipe will be conveyed by the material support frame to the unloading frame and roll diagonally downward along the unloading frame, realizing the unloading of the steel pipe. The coordination setting of the feeding mechanism and the unloading frame realizes the automatic loading and unloading of steel pipes, improving the automation rate of the device.

[0015] 3. The rotating drive arm drives the roller to rotate, releasing the roller from squeezing the movable plate. Under the rebound force of the spring, the slider slides upward along the guide post. At the same time, the movable plate moves with the slider. The slider drives the pin to slide along the inclined groove. Guided by the inclined groove, the two sets of connecting plates, together with the corresponding correction plates, move in opposite directions. The through holes on the correction plates slide along the slide rod, guiding the movement of the correction plates. This ensures that the distance between the two sets of correction plates and the two sets of limiting plates is greater than the length of the steel pipe, allowing the steel pipe to be smoothly placed between the two sets of limiting plates. After the steel pipe is placed between the two sets of limiting plates, the rotating drive arm drives the roller to squeeze the movable plate again until the drive arm is perpendicular to the movable plate. During this process, the two sets of correction plates move towards each other, making the distance between the two sets of correction plates and the two sets of limiting plates equal to the length of the steel pipe, thus correcting the position of the steel pipe and ensuring the accuracy of the steel pipe inspection. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a partial schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the combination of the limiting plate and the driving mechanism of the present invention.

[0019] Figure 3 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 4 This is a partial schematic diagram of the feeding mechanism of the present invention.

[0021] Figure 5 This is a schematic diagram of the combination of the material rack, limiting plate, and feeding mechanism of the present invention.

[0022] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0023] Figure 7 This is a schematic diagram of the assembly of the conveyor frame, drive arm, and movable plate of the present invention.

[0024] Figure 8 This is a schematic diagram of the overall structure of the present invention from another perspective.

[0025] In the diagram: 1. Material rack;

[0026] 2. Limiting plate; 201. Circumvention groove; 202. Bearing; 203. Synchronizing disc;

[0027] 3. Drive mechanism; 301. Synchronous shaft; 302. Rotating wheel; 303. Pulley; 304. Synchronous belt; 305. Guide wheel; 306. Drive wheel; 307. First motor;

[0028] 4. Support frame; 5. Lead screw; 6. Movable frame; 7. Detection arm; 8. Internal cavity scanner; 9. External wall scanner;

[0029] 10. Feeding mechanism; 101. Conveyor frame; 1011. Rectangular trough; 102. Rotating shaft; 103. Drive arm; 1031. Roller; 104. Connecting shaft; 105. Connecting rod; 106. Material support frame; 16. Discharge chute; 107. Synchronous pulley; 108. Transmission belt; 109. Drive wheel; 110. Second motor; 111. Correction mechanism; 1111. Movable plate; 1112. Slider; 21. Pin; 1113. Linkage plate; 31. Inclined trough; 1114. Correction plate; 41. Through hole; 42. Slide rod; 1115. Guide post; 1116. Spring;

[0030] 11. Material unloading rack. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0032] Example 1: As Figure 1 and Figure 2 As shown in the embodiment of the present invention, a stainless steel pipe testing device includes a material rack 1, two sets of limiting plates 2, and two sets of driving mechanisms 3. The two sets of limiting plates 2 and the two sets of driving mechanisms 3 are symmetrically mounted on the material rack 1. A support frame 4 is provided at one end of the material rack 1, and a lead screw 5 is rotatably mounted on the support frame 4. The lead screw 5 is screwed to a movable frame 6, and two sets of detection arms 7 are mounted on the movable frame 6. An internal cavity scanner 8 and an external wall scanner 9 are respectively mounted on the two sets of detection arms 7. The driving mechanism 3 includes two sets of synchronous shafts 301, which are rotatably mounted on the material rack 1. A rotating wheel 302 is mounted on one end of the synchronous shaft 301, and a pulley 303 is mounted on the other end of the synchronous shaft 301. Both sets of pulleys 303 are rotatably connected to the synchronous belt 304. A guide wheel 305 for guiding the synchronous belt 304 is rotatably mounted on the material rack 1. A first motor 307 for driving the drive wheel 306 is fixedly mounted on the material rack 1. The drive wheel 306 is rotatably connected to the synchronous belt 304. A clearance groove 201 for avoiding the detection arm 7 is opened on the limiting plate 2. A bearing 202 is embedded in the limiting plate 2, and a synchronous disc 203 is installed inside the bearing 202.

[0033] Specifically, both the internal cavity scanner 8 and the external wall scanner 9 are composed of a laser beam emitting module, a laser beam receiving module, and a data processing module. Initially, the distance between the two sets of limiting plates 2 is equal to the length of the steel pipe to be inspected. When the steel pipe needs to be inspected, it is placed between the two sets of limiting plates 2, so that the end of the steel pipe is positioned on the two sets of rotating wheels 302, and the end face of the steel pipe faces the synchronous disc 203. Then, the two sets of first motors 307 are started. The first motors 307 drive the drive wheel 306 to rotate. The drive wheel 306 drives the two sets of pulleys 303 to rotate via the synchronous belt 304. The pulleys 303 drive the synchronous shaft 301 to rotate together with the rotating wheel 302. The rotating wheel 302 drives the steel pipe to rotate. The end face of the steel pipe drives the synchronous disc 203 to rotate through friction. Then, the motor drives the lead screw 5 to rotate. The lever 5 drives the movable frame 6, along with two sets of detection arms 7, the inner cavity scanner 8, and the outer wall scanner 9, to move towards the steel pipe. This allows the inner cavity scanner 8 to enter the inside of the steel pipe, while the outer wall scanner 9 moves along the outer wall of the steel pipe through the clearance groove 201. This allows the inner cavity scanner 8 and the outer wall scanner 9 to measure the inner and outer rings of the steel pipe, respectively, until the inner cavity scanner 8 passes through the entire steel pipe. Then, the inner cavity scanner 8 and the outer wall scanner 9 are withdrawn, the steel pipe is replaced, and the same operation is performed to measure it. Compared with existing technologies, the combination of two sets of limit plates 2 and two sets of drive mechanisms 3 makes it easier for workers to pick up and put down the steel pipe, improving the efficiency of steel pipe inspection. Furthermore, the synchronous disc 203 rotates with the friction of the steel pipe end face, which greatly reduces the obstruction of the limit plate 2 to the rotation of the steel pipe, ensuring the accuracy of steel pipe inspection.

[0034] like Figure 3 and Figure 4 As shown, a feeding mechanism 10 is provided behind the material rack 1. The feeding mechanism 10 includes two sets of conveyor frames 101. Two sets of rotating shafts 102 are rotatably mounted on each of the two sets of conveyor frames 101. A drive arm 103 is mounted on one end of the rotating shaft 102. The two ends of the connecting shaft 104 are respectively connected to the two sets of drive arms 103. The lower end of the connecting rod 105 is hinged to the connecting shaft 104, and the upper end of the connecting rod 105 is hinged to the material support frame 106. The other end of each of the two sets of rotating shafts 102 is equipped with a synchronous pulley 107. Both sets of synchronous pulleys 107 are engaged with a transmission belt 108. The transmission belt 108 is engaged with a drive wheel 109. A second motor 110 for driving the drive wheel 109 is installed on one side of each set of conveyor frames 101. Several sets of discharge troughs 16 for placing steel pipes are installed at equal distances on the conveyor frames 101 and the material support frame 106. A discharge frame 11 for guiding the steel pipes is provided in front of the material rack 1.

[0035] Specifically, the loading and unloading of steel pipes requires manual operation, resulting in a low automation rate for the device. Before inspecting the steel pipes, they are placed one by one into the feeding trough 16 of the conveyor frame 101. When a steel pipe needs to be placed between the two sets of limit plates 2, the second motor 110 is started. The second motor 110 drives the drive wheel 109 to rotate. The drive wheel 109 drives the two sets of synchronous pulleys 107 to rotate via the transmission belt 108. The synchronous pulleys 107 drive the rotating shaft 102 and the drive arm 103 to rotate. The drive arm 103, through the connecting shaft 104, causes the other drive arm 103 to rotate as well. The rotating drive arm 103 is connected by... The connecting rod 105 drives the material support frame 106 to rotate. During the rotation of the material support frame 106, the feeding trough 16 on the material support frame 106 will lift the steel pipe, move the steel pipe forward, and place the steel pipe into the adjacent feeding trough 16 on the conveyor frame 101 or between the two sets of limit plates 2, realizing the feeding of the steel pipe. After the steel pipe is inspected, the second motor 110 is started again. The inspected steel pipe will be conveyed by the material support frame 106 to the unloading frame 11 and roll diagonally downward along the unloading frame 11 to realize the unloading of the steel pipe. The coordination setting of the feeding mechanism 10 and the unloading frame 11 realizes the automatic loading and unloading of steel pipes and improves the automation rate of the device.

[0036] Example 2: Figures 5 to 8 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a correction mechanism 111 is provided between the two sets of conveyor frames 101. The correction mechanism 111 includes a movable plate 1111, which is movably installed between the two sets of conveyor frames 101. Four sets of sliders 1112 are respectively installed at the four corners of the movable plate 1111. A connecting plate 1113 is movably installed on the sliders 1112. A correction plate 1114 is fixedly connected to the connecting plate 1113. One end of the correction plate 1114 is fixedly connected to the limiting plate 2. Two sets of rectangular grooves 1011 are symmetrically opened on the conveyor frame 101. A guide post 1115 is fixedly installed inside the rectangular groove 1011. The slider 1112 passes through the rectangular groove 1011 and is slidably connected to the guide post 1115. A spring 1116 is sleeved on the guide post 1115. Three sets of through holes 41 are opened on the correction plate 1114. The through holes 41 are slidably connected to the slide rod 42. One end of the slide rod 42 is fixedly connected to the conveyor frame 101. A pin 21 is installed on the slider 1112. An inclined groove 31 is opened at the lower end of the connecting plate 1113. The pin 21 is located in the inclined groove 31. A roller 1031 for squeezing the movable plate 1111 is rotatably installed at one end of the drive arm 103.

[0037] Specifically, during the process of lifting the steel pipe, the steel pipe will shift due to the lack of a steel pipe for restraint during the rapid movement of the support frame 106, preventing it from being placed between the two sets of limiting plates 2. Initially, the distance between the two sets of correction plates 1114 is equal to the distance between the two sets of limiting plates 2, and the distance between the two sets of correction plates 1114 is equal to the length of the steel pipe. The drive arm 103 is perpendicular to the movable plate 1111, and the spring 1116 is in a compressed state. When the steel pipe needs to be loaded, the rotating drive arm 103 drives the roller 1031 to rotate, releasing the pressure of the roller 1031 on the movable plate 1111. Under the rebound force of the spring 1116, the slider 1112 slides upward along the guide post 1115, and the movable plate 1111 moves with the slider 1112. The slider 1112 drives the pin 21. Sliding along the inclined groove 31, guided by the inclined groove 31, the two sets of connecting plates 1113, together with the corresponding correction plates 1114, move in opposite directions. The through holes 41 on the correction plates 1114 slide along the slide rod 42, which guides the movement of the correction plates 1114, making the distance between the two sets of correction plates 1114 and the two sets of limiting plates 2 greater than the length of the steel pipe, so that the steel pipe can be smoothly placed between the two sets of limiting plates 2. After the steel pipe is placed between the two sets of limiting plates 2, the rotating drive arm 103 drives the roller 1031 to press the movable plate 1111 again until the drive arm 103 is perpendicular to the movable plate 1111. During this process, the two sets of correction plates 1114 move towards each other, making the distance between the two sets of correction plates 1114 and the two sets of limiting plates 2 equal to the length of the steel pipe, thereby correcting the position of the steel pipe and ensuring the accuracy of the steel pipe inspection.

[0038] Working principle: The steel pipe is placed between two sets of limiting plates 2, so that the end of the steel pipe is positioned on two sets of rotating wheels 302, and the end face of the steel pipe is facing the synchronous disc 203. Then, the two sets of first motors 307 are started. The first motors 307 drive the drive wheel 306 to rotate. The drive wheel 306 drives the two sets of pulleys 303 to rotate via the synchronous belt 304. The pulleys 303 drive the synchronous shaft 301 to rotate together with the rotating wheel 302. The rotating wheel 302 drives the steel pipe to rotate. The end face of the steel pipe drives the synchronous disc 203 to rotate through friction. Then... The motor drives the lead screw 5 to rotate, which in turn moves the movable frame 6, along with two sets of detection arms 7, the inner cavity scanner 8, and the outer wall scanner 9, toward the steel pipe. This allows the inner cavity scanner 8 to enter the inside of the steel pipe, while the outer wall scanner 9 moves along the outer wall of the steel pipe through the clearance groove 201. The inner cavity scanner 8 and the outer wall scanner 9 then measure the inner and outer rings of the steel pipe, respectively, until the inner cavity scanner 8 passes through the entire steel pipe. After that, the inner cavity scanner 8 and the outer wall scanner 9 are withdrawn, the steel pipe is replaced, and the same operation is performed to measure it.

[0039] When the steel pipe needs to be placed between the two sets of limiting plates 2, the second motor 110 is started. The second motor 110 drives the drive wheel 109 to rotate. The drive wheel 109 drives the two sets of synchronous wheels 107 to rotate through the transmission belt 108. The synchronous wheels 107 drive the rotating shaft 102 to rotate together with the drive arm 103. The drive arm 103 drives the other drive arm 103 to rotate together through the connecting shaft 104. The rotating drive arm 103 drives the connecting rod 105 to rotate the material support frame 106. During the rotation of the material support frame 106, the feeding groove 16 on the material support frame 106 will lift the steel pipe, move the steel pipe forward, and place the steel pipe into the adjacent feeding groove 16 on the conveyor frame 101 or between the two sets of limiting plates 2 to realize the feeding of the steel pipe. After the steel pipe is inspected, the second motor 110 is started again. The inspected steel pipe will be conveyed by the material support frame 106 to the unloading frame 11 and roll diagonally downward along the unloading frame 11 to realize the unloading of the steel pipe.

[0040] When steel pipes need to be fed, the rotating drive arm 103 drives the roller 1031 to rotate, releasing the pressure of the roller 1031 on the movable plate 1111. Under the rebound force of the spring 1116, the slider 1112 slides upward along the guide post 1115. At the same time, the movable plate 1111 moves with the slider 1112. The slider 1112 drives the pin 21 to slide along the inclined groove 31. Guided by the inclined groove 31, the two sets of connecting plates 1113, together with the corresponding correction plates 1114, move in opposite directions. The through hole 41 on the correction plate 1114 slides along the slide rod 42. The movement of the correction plate 1114 is guided, ensuring that the distance between the two sets of correction plates 1114 and the two sets of limiting plates 2 is greater than the length of the steel pipe. This allows the steel pipe to be smoothly placed between the two sets of limiting plates 2. Once the steel pipe is placed between the two sets of limiting plates 2, the rotating drive arm 103 drives the roller 1031 to press the movable plate 1111 again until the drive arm 103 is perpendicular to the movable plate 1111. During this process, the two sets of correction plates 1114 move towards each other, ensuring that the distance between the two sets of correction plates 1114 and the two sets of limiting plates 2 is equal to the length of the steel pipe, thus achieving the position correction of the steel pipe.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stainless steel pipe testing device, comprising a material rack (1), two sets of limiting plates (2), and two sets of driving mechanisms (3), characterized in that: The two sets of limiting plates (2) and the two sets of driving mechanisms (3) are symmetrically installed on the material rack (1). A support frame (4) is provided at one end of the material rack (1). A lead screw (5) is rotatably installed on the support frame (4). The lead screw (5) is screwed to a movable frame (6). Two sets of detection arms (7) are installed on the movable frame (6). An internal cavity scanner (8) and an external wall scanner (9) are respectively installed on the two sets of detection arms (7). The drive mechanism (3) includes two sets of synchronous shafts (301), which are rotatably mounted on the material rack (1); A rotating wheel (302) is mounted on one end of the synchronous shaft (301); A pulley (303) is mounted on the other end of the synchronous shaft (301). The timing belt (304) is rotatably connected to both sets of pulleys (303). The material rack (1) is rotatably mounted with a guide wheel (305) for guiding the synchronous belt (304). A first motor (307) is fixedly installed on the material rack (1) for driving the drive wheel (306), and the drive wheel (306) is rotatably connected to the timing belt (304). A feeding mechanism (10) is provided behind the material rack (1), and the feeding mechanism (10) includes two sets of conveyor racks (101). Two sets of rotating shafts (102) are rotatably mounted on both sets of conveyor frames (101). A drive arm (103) is mounted on one end of the rotating shaft (102). Two sets of connecting shafts (104), with each end of the connecting shaft (104) connected to one of the two sets of driving arms (103); Four sets of connecting rods (105), the lower end of the connecting rods (105) is hinged to the connecting shaft (104), and the upper end of the connecting rods (105) is hinged to the material support frame (106). Both sets of rotating shafts (102) are equipped with synchronous pulleys (107) at their other ends. Both sets of synchronous pulleys (107) mesh with transmission belts (108). The transmission belts (108) mesh with drive pulleys (109). A second motor (110) for driving the drive pulleys (109) is installed on one side of a set of conveyor frames (101). Several sets of discharge troughs (16) for placing steel pipes are installed at equal distances on the conveyor frames (101) and the material support frame (106). A discharge frame (11) for guiding the steel pipes is set in front of the material rack (1). The limiting plate (2) is provided with a clearance groove (201) for avoiding the detection arm (7), and a bearing (202) is embedded in the limiting plate (2). A synchronous disk (203) is installed in the bearing (202). A correction mechanism (111) is provided between the two sets of conveyor frames (101). The correction mechanism (111) includes a movable plate (1111), which is movably installed between the two sets of conveyor frames (101). The movable plate (1111) has four sets of sliders (1112) installed at its four corners respectively. A connecting plate (1113) is movably mounted on the slider (1112). A correction plate (1114) is fixedly connected to the linkage plate (1113), and one end of the correction plate (1114) is fixedly connected to the limiting plate (2). The conveyor frame (101) is symmetrically provided with two sets of rectangular slots (1011). A guide post (1115) is fixedly installed in the rectangular slot (1011). The slider (1112) passes through the rectangular slot (1011) and is slidably connected to the guide post (1115). A spring (1116) is sleeved on the guide post (1115). The calibration plate (1114) has three sets of through holes (41), the through holes (41) are slidably connected to the slide rod (42), and one end of the slide rod (42) is fixedly connected to the conveyor frame (101). A pin (21) is installed on the slider (1112), and an inclined groove (31) is provided at the lower end of the connecting plate (1113). The pin (21) is located in the inclined groove (31), and a roller (1031) for squeezing the movable plate (1111) is rotatably installed at one end of the drive arm (103).

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