A centering device for ductile iron pipe production line

Abstract

The present invention relates to a centering device for a ductile iron pipe production line, which belongs to the technical field of ductile iron pipe production. It solves the technical problems of deviation and low efficiency in traditional centering by manual visual inspection. The solution is: a centering device for a ductile iron pipe production line, comprising two groups of pushing devices, a centering trolley, a first flipping moving device, a second flipping moving device, a pipe pushing device, a pipe pushing drive device, a monitoring device and a control system. Two tracks in the front and back directions are provided between the two groups of pushing devices. The centering trolley slides on the track. The first flipping moving device pushes the ductile iron pipe into the top surface of the centering trolley. The second flipping moving device positions and transports the ductile iron pipe. The pipe pushing drive device drives the pipe pushing device to push and center the two ends of the ductile iron pipe provided on the centering trolley. The present invention realizes the precise centering of ductile iron pipes, has a high degree of automation, saves manpower, reduces costs and improves efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of ductile iron pipe production, and particularly relates to a centering device for a ductile iron pipe production line. Background Art

[0002] In the production line of ductile iron pipes, ductile iron pipes need to be aligned before entering the annealing furnace, hydraulic press, cement lining, zinc spraying, painting and other sections. Currently, manual visual alignment technology is commonly used, which will result in the following defects:

[0003] 1. There is a deviation in the visual alignment, which often causes the lower workstation machine to jam and stop;

[0004] 2. The manual centering process is time-consuming and labor-intensive, increasing costs and inefficient, and the centering process takes a long time;

[0005] 3. The degree of automation is not high and cannot be coordinated with other automated equipment. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a centering device for a ductile iron pipe production line, which solves the technical problems of traditional centering by manual visual inspection, such as deviation, low efficiency and high cost.

[0007] In order to solve the above problems, the technical solution of the present invention is: a centering device for a ductile iron pipe production line, wherein: a centering area is provided between the conveyor lines of the ductile iron pipe production line, a plurality of groups of ductile iron pipes to be centered are placed on the conveyor line located to the left of the centering area, and the centering device is installed in the centering area. The centering device includes two groups of pushing devices, a centering trolley, a first flipping moving device, a second flipping moving device, a pipe pushing device, a pipe pushing drive device, a monitoring device and a control system;

[0008] The two groups of pushing devices are respectively arranged on the front and rear sides of the centering area and are symmetrically arranged relative to the conveying line. Two tracks in the front and rear directions are arranged between the two groups of pushing devices. The centering trolley is arranged on the track. The first flipping moving device is arranged at the right end of the conveying line on the left side of the centering area. The second flipping moving device is arranged on the centering trolley. The first flipping moving device pushes the ductile iron pipe on the left conveying line into the top surface of the centering trolley. The second flipping moving device positions and conveys the ductile iron pipe on the top surface of the centering trolley; the pipe pushing device is installed on the pushing device, and the pipe pushing driving device is arranged at the bottom of the pushing device. The pipe pushing driving device drives the pipe pushing device to push and center the two ends of the ductile iron pipe arranged on the centering trolley;

[0009] The monitoring device detects the position of the ductile iron pipe, and the monitoring device, the pipe pushing driving device, the first flipping and moving device, and the second flipping and moving device are respectively electrically connected to the control system.

[0010] Further, the conveyor line includes fixed columns symmetrically arranged front and rear and two groups of conveying platforms horizontally arranged on the top surfaces of the fixed columns. The first flipping and moving device includes a first "C"-shaped rotating frame and two groups of first pushing cylinders. The first "C"-shaped rotating frame is arranged between the right ends of the two groups of conveying platforms on the left conveyor line 1, and the right ends of the front and rear side walls of the first "C"-shaped rotating frame are respectively hinged to the corresponding conveying platforms. First baffles are respectively arranged at the right ends of the front and rear side walls of the first "C"-shaped rotating frame, and a first connecting plate is arranged between the front and rear side walls of the first "C"-shaped rotating frame; the two groups of first pushing cylinders are respectively symmetrically arranged on the front and rear sides inside the conveyor line. The top end of the piston rod of the first pushing cylinder is hinged to the left side wall of the first "C"-shaped rotating frame, and its bottom end is hinged to the bottom of the fixed column on the left side of the first "C"-shaped rotating frame. The first pushing cylinder pushes the first "C"-shaped rotating frame to rotate.

[0011] Further, the centering trolley includes a trolley chassis, four groups of columns, four groups of wheels and two groups of support platforms. The trolley chassis is of a rectangular frame structure. The four groups of columns are respectively vertically arranged at the four corners of the top surface of the trolley chassis. The two groups of support platforms are respectively arranged in parallel on the front and rear sides of the top surface of the columns. The direction of the support platforms is perpendicular to the direction of the track and parallel to the direction of the conveyor line. Reinforcing ribs are arranged between the two groups of columns on the left side and the two groups of columns on the right side of the centering trolley. Positioning blocks are arranged at the left ends of the top surfaces of the two groups of support platforms. The four groups of wheels are respectively arranged at the four corners of the trolley chassis. The wheels are respectively arranged on the track, and the centering trolley reciprocates back and forth along the track direction.

[0012] Further, the height dimension of the top surface of the centering trolley is smaller than the height dimension of the top surface of the left conveyor line, and the height dimension of the top surface of the centering trolley is larger than the height dimension of the top surface of the right conveyor line.

[0013] Further, the second flipping and moving device includes a second "C"-shaped rotating frame and two groups of second pushing cylinders. The second "C"-shaped rotating frame is arranged between the two groups of support platforms, and the right ends of the front and rear side walls of the second "C"-shaped rotating frame are respectively hinged to the corresponding support platforms. Second baffles are respectively arranged at the right ends of the front and rear side walls of the second "C"-shaped rotating frame, and a second connecting plate is arranged between the front and rear side walls of the second "C"-shaped rotating frame; the two groups of second pushing cylinders are respectively symmetrically arranged on the front and rear sides inside the centering trolley. The top end of the piston rod of the second pushing cylinder is hinged to the bottom of the second connecting plate, and its bottom end is hinged to the left side of the trolley chassis. The second pushing cylinder pushes the second "C"-shaped rotating frame to rotate.

[0014] Furthermore, the pushing device includes an upper rectangular frame, a lower rectangular frame and four groups of vertical rods vertically arranged at the four corners between the upper rectangular frame and the lower rectangular frame. The left and right sides of the upper rectangular frame are respectively fixed with guide sleeves in the front and rear directions. A guide rod is slidably arranged in the guide sleeve. Push plates are provided at the ends of the two groups of guide rods close to the side of the centering trolley, and the push plates and guide rods reciprocate along the guide sleeves; the left and right walls of the pushing device are both provided with shaft fixing plates, and a connecting shaft in the left and right directions is fixedly provided between the two groups of shaft fixing plates.

[0015] Furthermore, return springs are symmetrically arranged on the front and rear side walls of the trolley chassis, one end of the return spring is connected to the side wall of the trolley chassis, and the other end of the return spring is connected to the corresponding side wall of the pushing device.

[0016] Furthermore, the tube pushing device includes two groups of connecting rod devices, which are respectively arranged in the two groups of pushing devices, and the connecting rod devices include a first connecting rod, an "L"-shaped connecting rod, and a second connecting rod. The corner of the "L"-shaped connecting rod is hinged to the connecting shaft, one end of the first connecting rod is hinged to the middle part of the side of the push plate facing the inside of the pushing device, the other end of the first connecting rod is hinged to the upper end of the "L"-shaped connecting rod, and the upper end of the second connecting rod is hinged to the lower wall end of the "L"-shaped connecting rod;

[0017] The "L"-shaped connecting rod openings in the two groups of connecting rod devices are both set to face backward, and a driving rod in the front and rear directions is set under the chassis of the trolley. The two ends of the driving rod are respectively hinged to the lower ends of the second connecting rods in the two groups of connecting rod devices.

[0018] Furthermore, the push tube driving device is a centering cylinder, which is horizontally arranged forward at the bottom of the pushing device on the rear side and is arranged on one side of the driving rod. The fixed end of the centering cylinder is hinged to the rear side of the lower rectangular frame, and the piston rod end of the centering cylinder is hinged to the side wall of the driving rod. The centering cylinder drives the driving rod to reciprocate back and forth.

[0019] Furthermore, the monitoring device includes a first trigger sensor, a second trigger sensor and a third trigger sensor. The first trigger sensor is arranged at the lower part of the fixed column where the first pushing cylinder is located, the second trigger sensor is arranged on the rear side wall of the push plate of the front pushing device, and the third trigger sensor is arranged on the front side wall of the push plate of the rear pushing device. The first trigger sensor, the second trigger sensor and the third trigger sensor are electrically connected to the control system respectively.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the present invention, the first flipping and moving device pushes the ductile iron pipes to be processed on the conveyor line onto the centering trolley. The pipe pushing device centers them, and the second flipping and moving device pushes the centered ductile iron pipes onto the subsequent conveyor line for subsequent process work, achieving the centering of ductile iron pipes and ensuring normal operation after entering other equipment.

[0022] 2. In the first flipping and moving device, when the piston rod of the first pushing cylinder extends, it pushes the left side of the first "C"-shaped rotating frame to lift, and pushes the ductile iron pipe on it onto the centering trolley behind it. The second baffle of the second flipping and moving device first plays a limiting role on the ductile iron pipe to prevent the ductile iron pipe from being pushed onto the subsequent conveyor line. When centering is completed, the piston rod of the second pushing cylinder extends, pushing the left side of the second "C"-shaped rotating frame to lift, and pushing the centered ductile iron pipe into the subsequent conveyor line, without manual pushing, which is simple and fast.

[0023] 3. The pipe pushing device is provided with two sets of connecting rod devices synchronously connected by a driving rod. The centering cylinder drives the driving rod to move back and forth. In the initial stage, when the driving rod moves forward, the two first connecting rods move away from each other,带动 the push plates to move away from each other. When the ductile iron pipe to be centered reaches the top surface of the centering trolley, the centering cylinder drives the driving rod to move backward, the two first connecting rods move closer to each other,带动 the push plates to move closer to each other. One side of the push plate first contacts the ductile iron pipe and continues to push. The ductile iron pipe带动 the centering trolley to move on the track until it contacts the push plate on the other side, and the centering process is completed. The pushing devices on both sides are symmetrical to ensure the accuracy of centering.

[0024] 4. After the centered ductile iron pipe is pushed onto the subsequent conveyor line, the centering trolley realizes automatic return through the action of the return spring for the next centering process.

[0025] 5. With a high degree of automation, through the settings of the first trigger sensor, the second trigger sensor and the third trigger sensor, the automation of each component in the centering process is achieved, improving the efficiency.

[0026] The present invention realizes the precise centering of ductile iron pipes, avoids deviations in the centering process, has a high degree of automation, saves manpower, reduces costs and improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the conveyor line in the present invention;

[0028] Figure 2 It is a schematic structural diagram of the present invention;

[0029] Figure 3 [[ID=B]] [[ID=D]]

[0030] ​ Figure 4 Schematic diagram of the structure of the first flip movement device in the present invention;

[0031] Figure 5 Schematic diagram of the structure of the pushing device and the pipe pushing device in the present invention;

[0032] Figure 6 Schematic diagram of the structure of the pipe pushing device in the present invention;

[0033] Figure 7 A side view of the small carriage and the pushing device in the present invention;

[0034] Figure 8 The moving direction of the connecting rod device when the driving rod moves forward in the present invention;

[0035] Figure 9 The moving direction of the connecting rod device when the driving rod moves backward in the present invention DETAILED DESCRIPTION

[0036] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0037] like Figures 1 to 9 A centering device for a ductile iron pipe production line is shown, wherein: a centering area 2 is provided between the conveyor lines 1 of the ductile iron pipe production line, and a plurality of groups of ductile iron pipes 3 to be centered are placed on the conveyor line 1 located to the left of the centering area 2. The centering device is installed in the centering area 2 and includes two groups of pushing devices 4, a centering trolley 5, a first flipping and moving device 6, a second flipping and moving device 7, a pipe pushing device 8, a pipe pushing drive device 9, a monitoring device, and a control system;

[0038] The two groups of pushing devices 4 are respectively arranged on the front and rear sides of the centering area 2 and are symmetrically arranged relative to the conveyor line 1. Two tracks 10 in the front and rear directions are arranged between the two groups of pushing devices 4. The centering trolley 5 is arranged on the track 10. The centering trolley 5 reciprocates back and forth along the track 10. The first flipping moving device 6 is arranged at the right end of the conveyor line 1 on the left side of the centering area 2. The second flipping moving device 7 is arranged on the centering trolley 5. The first flipping moving device 6 pushes the ductile iron pipe 3 on the left conveyor line 1 into the top surface of the centering trolley 5. The second flipping moving device 7 flips the ductile iron pipe 3 on the left conveyor line 1 into the top surface of the centering trolley 5. The ductile iron pipe 3 on the top surface of the small car 5 is positioned and transported; when it is not centered, the second flip moving device 7 limits the position of the ductile iron pipe 3 to prevent it from entering the subsequent conveying line 1. After the centering is completed, the second flip moving device 7 pushes the ductile iron pipe 3 and sends it to the subsequent conveying line 1 to enter the subsequent work section. The pipe pushing device 8 is installed on the pushing device 4, and the pipe pushing drive device 9 is provided at the bottom of the pushing device 4. The pipe pushing drive device 9 drives the pipe pushing device 8 to push and center the two ends of the ductile iron pipe 3 provided on the centering small car 5;

[0039] The monitoring device detects the position of the ductile iron pipe 3. The monitoring device, the pipe pushing drive device 9, the first flipping and moving device 6 and the second flipping and moving device 7 are respectively electrically connected to the control system. Through the control of each component by the control system, the centering process is automated, eliminating the need for manual centering and pushing, saving time and effort and improving efficiency.

[0040] Further, the conveyor line 1 includes fixed columns 1-1 symmetrically arranged front and back and two sets of conveying platforms 1-2 horizontally arranged on the top surfaces of the fixed columns 1-1. The first flipping and moving device 6 includes a first "C"-shaped rotating frame 6-1 and two sets of first pushing cylinders 6-2. The first "C"-shaped rotating frame 6-1 is arranged between the right ends of the two sets of conveying platforms 1-2 on the left conveyor line 1, and the right ends of the front and rear side walls of the first "C"-shaped rotating frame 6-1 are respectively hinged to the corresponding conveying platforms 1-2. First baffles 6-3 are respectively arranged at the right ends of the front and rear side walls of the first "C"-shaped rotating frame 6-1. The first baffles 6-3 position the ductile iron pipe 3 to be centered, preventing the ductile iron pipe 3 at the rear from falling onto the top surface of the centering trolley 5 and affecting the centering process when the ductile iron pipe 3 in the front is being centered. A first connecting plate 6-4 is arranged between the front and rear side walls of the first "C"-shaped rotating frame 6-1; the two sets of first pushing cylinders 6-2 are respectively symmetrically arranged on the front and rear sides inside the conveyor line 1. The top end of the piston rod of the first pushing cylinder 6-2 is hinged to the left side wall of the first "C"-shaped rotating frame 6-1, and its bottom end is hinged to the bottom of the fixed column 1-1 on the left side of the first "C"-shaped rotating frame 6-1. The first pushing cylinder 6-2 pushes the first "C"-shaped rotating frame 6-1 to rotate. The pushing function of the first flipping and moving device 6: When the ductile iron pipe 3 to be centered is above it, the piston rod of the first pushing cylinder 6-2 rises, pushing the left side of the first "C"-shaped rotating frame 6-1 to lift, and pushing the ductile iron pipe 3 onto the top surface of the centering trolley 5; The positioning function of the first flipping and moving device 6: After pushing the ductile iron pipe 3 onto the top surface of the centering trolley 5, the piston rod of the first pushing cylinder 6-2 retracts, leveling the left side of the first "C"-shaped rotating frame 6-1, and the first baffle 6-3 limits the ductile iron pipe 3 that has not been processed.

[0041] Furthermore, the centering trolley 5 includes a trolley chassis 5-1, four sets of columns 5-2, four sets of wheels 5-3 and two sets of support platforms 5-4. The trolley chassis 5-1 is a rectangular frame structure. The four sets of columns 5-2 are respectively vertically arranged at the four corners of the top surface of the trolley chassis 5-1. The two sets of support platforms 5-4 are respectively arranged in parallel on the front and rear sides of the top surfaces of the columns 5-2. The direction of the support platform 5-4 is perpendicular to the direction of the track and parallel to the direction of the conveyor line 1. Reinforcing ribs 5-5 are provided between the two sets of columns 5-2 on the left side of the centering trolley 5 and the two sets of columns 5-2 on the right side. Positioning blocks 5-6 are provided at the left ends of the top surfaces of the two sets of support platforms 5-4. The four sets of wheels 5-3 are respectively arranged at the four corners of the trolley chassis 5-1. The wheels 5-3 are respectively arranged on the track 10. The centering trolley 5 reciprocates back and forth along the direction of the track 10. The positioning block 5-6 prevents the ductile iron pipe 3 from touching the second baffle 7-3 first and then rebounding back to the left conveyor line 1 after entering the top surface of the centering trolley 5, playing a positioning role for the ductile iron pipe 3.

[0042] Furthermore, the height dimension of the top surface of the centering trolley 5 is smaller than the height dimension of the top surface of the left conveyor line 1, which is convenient for pushing the ductile iron pipe 3 to be centered on the left conveyor line 1 onto the top surface of the centering trolley 5. The height dimension of the top surface of the centering trolley 5 is larger than the height dimension of the top surface of the right conveyor line 1, which is convenient for pushing the ductile iron pipe 3 on the top surface of the centering trolley 5 into the subsequent conveyor line 1.

[0043] Furthermore, the second flipping and moving device 7 includes a second "C"-shaped rotating frame 7-1 and two sets of second pushing cylinders 7-2. The second "C"-shaped rotating frame is arranged between the two sets of support platforms 5-4. The right ends of the front and rear side walls of the second "C"-shaped rotating frame 7-1 are respectively hinged to the corresponding support platforms 5-4. Second baffles 7-3 are respectively arranged at the right ends of the front and rear side walls of the second "C"-shaped rotating frame 7-1. A second connecting plate 7-4 is arranged between the front and rear side walls of the second "C"-shaped rotating frame 7-1. The two sets of second pushing cylinders 7-2 are respectively symmetrically arranged on the front and rear sides inside the centering trolley 5. The top ends of the piston rods of the second pushing cylinders 7-2 are hinged to the bottom of the second connecting plate 7-4, and the bottom ends are hinged to the left side of the trolley chassis 5-1. The second pushing cylinders 7-2 push the second "C"-shaped rotating frame 7-1 to rotate. The positioning function of the second flipping and moving device 7: After the ductile iron pipe 3 to be centered is pushed onto the top surface of the centering trolley 5 by the first flipping and moving device 6, the second baffle 7-3 first limits it to prevent it from entering the subsequent conveyor line 1. The pushing function of the second flipping and moving device 7: After centering is completed, the second pushing cylinder 7-2 pushes the left side of the second "C"-shaped rotating frame 7-1 to lift, and pushes the centered ductile iron pipe 3 into the subsequent conveyor line 1.

[0044] Furthermore, the pushing device 4 includes an upper rectangular frame 4-1, a lower rectangular frame 4-2, and four sets of upright rods 4-3 vertically arranged at the four corners between the upper rectangular frame 4-1 and the lower rectangular frame 4-2. A front-to-rear guide sleeve 4-4 is fixedly installed on the left and right sides of the upper rectangular frame 4-1. Guide rods 4-5 are slidably installed in the guide sleeves 4-4. Push plates 4-6 are installed at the ends of the two sets of guide rods 4-5 near the side of the centering trolley 5. The push plates 4-6 and guide rods 4-5 reciprocate along the guide sleeves 4-4. The left and right walls of the pushing device 4 are each provided with an axis fixing plate 4-7. A left-right connecting shaft 4-8 is fixedly installed between the two sets of axis fixing plates 4-7. The two sets of pushing devices 4 are symmetrically arranged relative to the centerline of the conveyor line 1, ensuring centering accuracy during the pushing process.

[0045] Furthermore, return springs 11 are symmetrically disposed on the front and rear side walls of the trolley chassis 5-1. One end of each return spring 11 is connected to the side wall of the trolley chassis 5-1, and the other end of each return spring 11 is connected to the corresponding side wall of the pusher device 4. In the initial state, the centering trolley 5 is at the center position. During the centering process, the trolley 5 moves. After the centered ductile iron pipe 3 enters the subsequent conveyor line 1, the trolley 5 is unloaded. Under the action of the return spring 11, the trolley 5 returns to the center position and begins centering the next ductile iron pipe 3.

[0046] Furthermore, the tube pushing device 8 includes two groups of connecting rod devices 8-1, and the two groups of connecting rod devices 8-1 are respectively arranged in the two groups of pushing devices 4, and the connecting rod device 8-1 includes a first connecting rod 8-1-1, an "L"-shaped connecting rod 8-1-2 and a second connecting rod 8-1-3. The corner of the "L"-shaped connecting rod 8-1-2 is hinged to the connecting shaft 4-8, and one end of the first connecting rod 8-1-1 is hinged to the middle of one side of the push plate 4-6 toward the inside of the pushing device 4, and the other end of the first connecting rod 8-1-1 is hinged to the upper end of the "L"-shaped connecting rod 8-1-2, and the upper end of the second connecting rod 8-1-3 is hinged to the lower wall end of the "L"-shaped connecting rod 8-1-2; the precise centering process is completed by the setting of the connecting rod device 8-1, and there is no need to use motors or other drives for adjustment on both sides, with a simple structure and low cost.

[0047] The openings of the "L"-shaped connecting rods 8-1-2 in the two sets of connecting rod devices 8-1 are both set to face backwards. A driving rod 8-2 in the front-to-back direction is set below the trolley chassis 5-1. The two ends of the driving rod 8-2 are respectively hinged to the lower ends of the second connecting rods 8-1-3 in the two sets of connecting rod devices 8-1. The setting of the driving rod 8-2 connects the two sets of connecting rod devices 8-1 into one, so that they move synchronously and push at the same time and distance, ensuring the accuracy of the centering. Figure 8As shown, when the driving rod 8-2 moves forward, the two groups of first connecting rods 8-1-1 move away from each other synchronously. When the driving rod 8-2 moves backward, the two groups of first connecting rods 8-1-1 move closer to each other synchronously. The synchronous approach realizes the centering process of the ductile iron pipe 3. One set of push plates 4-6 first contacts one side of the pipe body. If the other end has not contacted yet, it will continue to move until it contacts, completing the centering process.

[0048] Furthermore, the pipe pushing driving device 9 is a centering cylinder. The centering cylinder is horizontally arranged forward at the bottom of the rear pushing device 4 and is arranged on one side of the driving rod 8-2. The fixed end of the centering cylinder is hinged to the rear side of the lower rectangular frame 4-2, and the end of the piston rod of the centering cylinder is hinged to the side wall of the driving rod 8-2. The centering cylinder drives the driving rod 8-2 to reciprocate back and forth.

[0049] Furthermore, the monitoring device includes a first trigger sensor 12-1, a second trigger sensor 12-2, and a third trigger sensor 12-3. The first trigger sensor 12-1 is arranged at the lower part of the fixed column 1-1 where the first pushing cylinder 6-2 is located. The second trigger sensor 12-2 is arranged on the rear side wall of the push plate 4-6 of the front pushing device 4. The third trigger sensor 12-3 is arranged on the front side wall of the push plate 4-6 of the rear pushing device 4. The first trigger sensor 12-1, the second trigger sensor 12-2, and the third trigger sensor 12-3 are electrically connected to the control system respectively. The setting of the monitoring device and the control system realizes the automation of the centering process.

[0050] The working process of the present invention: Several groups of ductile iron pipes 3 to be processed are placed in the left conveyor line 1. When the first trigger sensor 12-1 detects the ductile iron pipe 3 above it, it transmits a signal to the control system. The control system controls the piston rod of the first pushing cylinder 6-2 to rise, pushing the left side of the first "C" - shaped rotating frame 6-1 to lift, and pushing the ductile iron pipe 3 thereon onto the top surface of the centering trolley 5. Then the piston rod of the first pushing cylinder 6-2 retracts. During the subsequent centering process, the first baffle 6-3 limits the ductile iron pipe 3 on the left conveyor line 1 to prevent multiple groups of ductile iron pipes 3 from all falling onto the top surface of the centering trolley 5.

[0051] Initially, the two sets of push plates 4-6 are in a separated state. The rolling ductile iron pipe 3 first touches the second baffle 7-3 and then rebounds. The positioning block 5-6 limits its left side, so that the ductile iron pipe 3 remains on the top surface of the centering trolley 5. After a short period of time, the ductile iron pipe 3 stops. The control system controls the centering cylinder to work. The centering cylinder drives the drive rod 8-2 to move backward, and the two sets of first connecting rods 8-1-1 move closer synchronously, thereby driving the two sets of push plates 4-6 to move closer simultaneously and at the same distance. If the front push plate 4-6 first contacts the front end of the pipe body, and the rear end has not yet contacted the rear push plate 4-6, the centering cylinder continues to work, and the drive rod 8-2 continues to move backward. When the third trigger sensor 12-3 on the rear push plate 4-6 and the second trigger sensor 12-2 on the front push plate both sense signals, the control system controls the centering cylinder to stop working, and the centering process of the ductile iron pipe 3 is completed.

[0052] After centering is completed, the control system controls the piston rod of the second pushing cylinder 7-2 to rise, pushing the left side of the second "C"-shaped rotating frame 7-1 to lift, and pushing the ductile iron pipe 3 after centering into the subsequent conveyor line 1, that is, the centering and conveying of a set of ductile iron pipes 3 are completed. When the centering trolley 5 is in an empty state, the two sets of return springs 11 return the centering trolley 5 to the center, preparing for the centering process of the next set of ductile iron pipes 3.

Claims

1. A centering device for a ductile iron pipe production line, characterized by: There is a centering area (2) provided between the conveying lines (1) of the ductile iron pipe production line. A number of groups of ductile iron pipes (3) to be centered are placed on the conveying line (1) on the left side of the centering area (2). The centering device is installed in the centering area (2), and the centering device includes two sets of pushing devices (4), a centering trolley (5), a first flipping and moving device (6), a second flipping and moving device (7), a pipe pushing device (8), a pipe pushing driving device (9), a monitoring device and a control system; The two sets of pushing devices (4) are respectively arranged on the front and rear sides of the centering area (2) and are symmetrically arranged relative to the conveying line (1). There are two tracks (10) in the front and rear directions between the two sets of pushing devices (4). The centering trolley (5) is arranged on the tracks (10). The first flipping and moving device (6) is arranged at the right end of the conveying line (1) on the left side of the centering area (2). The second flipping and moving device (7) is arranged on the centering trolley (5). The first flipping and moving device (6) pushes the ductile iron pipe (3) on the left conveying line (1) onto the top surface of the centering trolley (5). The second flipping and moving device (7) positions and conveys the ductile iron pipe (3) on the top surface of the centering trolley (5); The pipe pushing device (8) is installed on the pushing device (4), and the pipe pushing driving device (9) is arranged at the bottom of the pushing device (4). The pipe pushing driving device (9) drives the pipe pushing device (8) to push both ends of the ductile iron pipe (3) arranged on the centering trolley (5) for centering; The monitoring device detects the position of the ductile iron pipe (3), and the monitoring device, the pipe pushing driving device (9), the first flipping and moving device (6) and the second flipping and moving device (7) are respectively electrically connected to the control system; The conveying line (1) includes fixed columns (1-1) symmetrically arranged in the front and rear and two sets of conveying platforms (1-2) horizontally arranged on the top surfaces of the fixed columns (1-1). The first flipping and moving device (6) includes a first "C"-shaped rotating frame (6-1) and two sets of first pushing cylinders (6-2). The first "C"-shaped rotating frame (6-1) is arranged between the right ends of the two sets of conveying platforms (1-2) of the left conveying line (1), and the right ends of the front and rear side walls of the first "C"-shaped rotating frame (6-1) are respectively hinged to the corresponding conveying platforms (1-2). First baffles (6-3) are respectively arranged at the right ends of the front and rear side walls of the first "C"-shaped rotating frame (6-1). A first connecting plate (6-4) is arranged between the front and rear side walls of the first "C"-shaped rotating frame (6-1); The two sets of first pushing cylinders are symmetrically arranged on the front and rear sides inside the conveying line (1). The piston rod top of the first pushing cylinder (6-2) is hinged to the left side wall of the first "C"-shaped rotating frame (6-1), and its bottom end is hinged to the bottom of the fixed column (1-1) on the left side of the first "C"-shaped rotating frame (6-1). The first pushing cylinder (6-2) pushes the first "C"-shaped rotating frame (6-1) to rotate; The centering trolley (5) comprises a trolley chassis (5-1), four groups of columns (5-2), four groups of wheels (5-3) and two groups of support platforms (5-4). The trolley chassis (5-1) is a rectangular frame structure. The four groups of columns (5-2) are respectively vertically arranged at the four corners of the top surface of the trolley chassis (5-1). The two groups of support platforms (5-4) are respectively parallelly arranged at the front and rear sides of the top of the columns (5-2). The direction of the support platforms (5-4) is perpendicular to the direction of the track and is aligned with the conveyor line ( 1) parallel in direction, reinforcing ribs (5-5) are provided between the two groups of columns (5-2) on the left side and the two groups of columns (5-2) on the right side of the centering trolley (5), positioning blocks (5-6) are provided at the left ends of the top surfaces of the two groups of support platforms (5-4), the four groups of wheels (5-3) are respectively provided at the four corners of the trolley chassis (5-1), the wheels (5-3) are respectively provided on the track (10), and the centering trolley (5) reciprocates forward and backward along the direction of the track (10); The pushing device (4) comprises an upper rectangular frame (4-1), a lower rectangular frame (4-2) and four groups of vertical rods (4-3) vertically arranged at the four corners between the upper rectangular frame (4-1) and the lower rectangular frame (4-2); guide sleeves (4-4) in the front-rear direction are fixedly arranged on the left and right sides of the upper rectangular frame (4-1); guide rods (4-5) are slidably arranged in the guide sleeves (4-4); push plates (4-6) are arranged at the ends of the two groups of guide rods (4-5) close to the side of the centering trolley (5); the push plates (4-6) and the guide rods (4-5) reciprocate along the guide sleeves (4-4); shaft fixing plates (4-7) are arranged on the left and right walls of the pushing device (4); and a connecting shaft (4-8) in the left and right directions is fixedly arranged between the two groups of shaft fixing plates (4-7); The tube pushing device (8) includes two groups of connecting rod devices (8-1), the two groups of connecting rod devices (8-1) are respectively arranged in the two groups of pushing devices (4), the connecting rod device (8-1) includes a first connecting rod (8-1-1), an "L"-shaped connecting rod (8-1-2) and a second connecting rod (8-1-3), the corner of the "L"-shaped connecting rod (8-1-2) is hinged to the connecting shaft (4-8), one end of the first connecting rod (8-1-1) is hinged to the middle of one side of the pushing plate (4-6) facing the inside of the pushing device (4), the other end of the first connecting rod (8-1-1) is hinged to the upper end of the "L"-shaped connecting rod (8-1-2), and the upper end of the second connecting rod (8-1-3) is hinged to the lower wall end of the "L"-shaped connecting rod (8-1-2); The openings of the "L"-shaped connecting rods (8-1-2) in the two sets of connecting rod devices (8-1) are both arranged to face rearwards, and a driving rod (8-2) in the front-rear direction is arranged below the trolley chassis (5-1), and both ends of the driving rod (8-2) are respectively hinged to the lower ends of the second connecting rods (8-1-3) in the two sets of connecting rod devices (8-1); On the front and rear side walls of the trolley chassis (5-1), centering springs (11) are symmetrically arranged. One end of the centering spring (11) is connected to the side wall of the trolley chassis (5-1), and the other end of the centering spring (11) is connected to the side wall of the corresponding pushing device (4). The push tube driving device (9) is a centering cylinder. The centering cylinder is horizontally arranged forward at the bottom of the rear pushing device (4) and is arranged on one side of the driving rod (8-2). The fixed end of the centering cylinder is hinged to the rear side of the lower rectangular frame (4-2), and the end of the piston rod of the centering cylinder is hinged to the side wall of the driving rod (8-2). The centering cylinder drives the driving rod (8-2) to reciprocate back and forth.

2. A ductile iron pipe production line centering device according to claim 1, characterized in that: The top surface height dimension of the centering trolley (5) is smaller than the top surface height dimension of the left conveyor line (1), and the top surface height dimension of the centering trolley (5) is larger than the top surface height dimension of the right conveyor line (1).

3. The centering device for a ductile iron pipe production line according to claim 1, characterized in that: The second flipping and moving device (7) includes a second "C"-shaped rotating frame (7-1) and two groups of second pushing cylinders (7-2). The second "C"-shaped rotating frame is arranged between the two groups of support platforms (5-4), and the right ends of the front and rear side walls of the second "C"-shaped rotating frame (7-1) are respectively hinged to the corresponding support platforms (5-4). Second baffles (7-3) are respectively arranged at the right ends of the front and rear side walls of the second "C"-shaped rotating frame (7-1), and a second connecting plate (7-4) is arranged between the front and rear side walls of the second "C"-shaped rotating frame (7-1). The two groups of second pushing cylinders (7-2) are respectively symmetrically arranged on the front and rear sides inside the centering trolley (5). The top end of the piston rod of the second pushing cylinder (7-2) is hinged to the bottom of the second connecting plate (7-4), and its bottom end is hinged to the left side of the trolley chassis (5-1). The second pushing cylinder (7-2) pushes the second "C"-shaped rotating frame (7-1) to rotate.

4. The centering device for a ductile iron pipe production line according to claim 1, characterized in that: The monitoring device includes a first trigger sensor (12-1), a second trigger sensor (12-2) and a third trigger sensor (12-3). The first trigger sensor (12-1) is arranged at the lower part of the fixed column (1-1) where the first pushing cylinder (6-2) is located. The second trigger sensor (12-2) is arranged on the rear side wall of the push plate (4-6) of the front pushing device (4). The third trigger sensor (12-3) is arranged on the front side wall of the push plate (4-6) of the rear pushing device (4). The first trigger sensor (12-1), the second trigger sensor (12-2) and the third trigger sensor (12-3) are respectively electrically connected to the control system.

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