A pipe fitting necking production device and method

Abstract

The present invention provides a pipe fitting necking production device and method, which relates to the technical field of metal pipe fitting processing. The pipe fitting necking production device and method include a pipe fitting, a workbench, a hydraulic tank, an annular guide rail, a guide rail driving device, a lubricating oil tank, an oil delivery pump, a loading manipulator, an unloading manipulator, a control device, a necking die, and multiple groups of alignment sensors. In the present invention, the annular guide rail cooperates with the movable plate, the clamping pipe and the manipulator to realize the automatic transfer of the pipe fitting at the necking, oil spraying, loading and unloading stations; the spring of the floating structure between the clamping pipe and the movable plate absorbs the axial displacement, and the double rotating seats allow slight deflection to solve the alignment deviation of rigid clamping; the rotation driving structure controls the rotation angle of the necking gap through an algorithm, and cooperates with the pressure maintaining and spring eliminating mechanism to eliminate the excessive ovality; the lifting type oil spraying ring has circumferentially arrayed oil spraying holes and quantitative control to realize atomized spraying, and the dynamic distance cooperates with the programmed oil spraying duration, so that the lubrication is uniform and the consumption of lubricating oil is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of metal pipe fitting processing, and particularly to a pipe fitting necking production device and method. Background Art

[0002] A hydraulically driven round pipe necking machine is a special equipment that uses a hydraulic system to provide power and die guidance to achieve necking at the end of a pipe fitting. Its core structure can be divided into five major parts: a hydraulic system, a mechanical main body, a die assembly, a control system, and auxiliary devices. The hydraulic system is the power core of the necking machine. The oil cylinder in the hydraulic system pushes the necking die to apply a radial compression force to the pipe fitting. The necking die is composed of multiple die segments and radially contracts under hydraulic drive. This type of necking die is suitable for a large reduction ratio.

[0003] However, the existing hydraulically driven round pipe necking device still has the following technical problems: manual dependence and efficiency bottleneck. Traditional equipment relies on manual loading and unloading, and it is difficult to match the feeding rhythm with the hydraulic processing cycle, resulting in low production efficiency (especially in large-scale production scenarios), and manual operation is prone to cause positioning errors and safety risks; the pipe fitting shifts during the necking process. When necking with hydraulic pressure, the radial pressure is likely to drive the pipe fitting to move axially. However, the clamping rigidity of the traditional manipulator is too high, lacking floating compensation, resulting in misalignment between the pipe fitting and the die; the lack of sequential coordination of multi-pass necking rotation control: multiple necking operations require rotating the pipe fitting to balance deformation. However, the existing equipment lacks the sequential coordination of the necking action and the rotational movement. Manual adjustment is difficult to ensure the angle accuracy, easily leading to an excessive ovality of the pipe orifice. Traditional manual spraying of lubricating oil has problems such as uneven coverage and excessive splashing, resulting in an increase in the local friction coefficient and an increase in the consumption of lubricant.

[0004] To solve the above problems, it is necessary to improve and optimize the structure of the pipe fitting necking production device and method. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a pipe fitting necking production device and method, which solves the problems of low efficiency of manual loading and unloading, uneven coverage of manual spraying of lubricating oil, lack of floating compensation for direct feeding by an ordinary manipulator, and lack of sequential coordination of the necking action and the rotational movement in the existing pipe fitting necking production device.

[0006] To achieve the above object, the present invention is realized by the following technical solutions: A pipe fitting necking production device includes a pipe fitting, a workbench, a hydraulic tank, an annular guide rail, a guide rail driving device, a lubricating oil tank, an oil delivery pump, a loading manipulator, an unloading manipulator, a control device, a necking die, and multiple groups of alignment sensors. A guide rail cover is fixedly connected to the upper wall of the workbench. The annular guide rail is arranged on the upper wall of the workbench and is located inside the guide rail cover. The annular guide rail is driven to rotate by the guide rail driving device. The guide rail driving device consists of a servo motor, a sprocket, and a chain. Multiple groups of movable plates are arranged on the outer wall of the annular guide rail. A clamping tube for placing the pipe fitting body is arranged at one end of the movable plate far from the annular guide rail. The clamping tube penetrates through the movable plate and is slidably connected thereto. A floating structure is arranged between the clamping tube and the movable plate. A rotation driving structure for driving the clamping tube to rotate is arranged between the end of the clamping tube extending below the movable plate and the outer wall of the workbench. The upper wall of the guide rail cover is slidably connected with a mounting frame through a guiding structure. A lifting driving structure for driving the mounting frame to lift is arranged between the mounting frame and the guide rail cover. An oil spraying structure for spraying lubricating oil is arranged at the rear end of the mounting frame.

[0007] Preferably, the workbench and the hydraulic tank are respectively supported by a group of brackets. The hydraulic tank is located directly behind the workbench. A machine head is fixedly connected to the upper wall of the hydraulic tank. The front end of the machine head extends towards the front wall of the hydraulic tank. A hydraulic driver is arranged on the upper wall of the machine head and near the front end. The necking die is arranged on the lower wall of the machine head and is located on the front side of the hydraulic tank. The necking die consists of a frame and multiple die segments arranged on the inner side wall of the frame. Multiple groups of the die segments are driven to radially contract by the hydraulic driver. The front side of the workbench is sequentially provided with an unloading station, a first empty station, and a loading station from right to left. The rear side of the workbench is sequentially provided with an oil spraying station, a necking station, and a second empty station from left to right. The loading manipulator and the unloading manipulator respectively correspond to the positions of the loading station and the unloading station. The oil spraying structure corresponds to the position of the oil spraying station. The rotation driving structure corresponds to the position of the necking station and the necking station is vertically aligned with the necking die. The movable plate is driven by the guide rail driving device to sequentially pass through the loading station, the oil spraying station, the necking station, the second empty station, the unloading station, and the first empty station.

[0008] Preferably, the floating structure includes a flange, a first rotating seat, a second rotating seat, and a spring. The flange is fixedly connected to the circumferential outer wall of the clamping tube and near the upper end of the clamping tube. The second rotating seat is rotatably connected to the lower wall of the flange. The first rotating seat is rotatably connected to the inner wall of one end of the movable plate far from the annular guide rail. The clamping tube penetrates through the inner wall of the second rotating seat and is slidably connected thereto. The spring is sleeved on the outer wall of the clamping tube and is located between the first rotating seat and the second rotating seat.

[0009] Preferably, the rotary drive structure includes a motor, a first gear, and a second gear. The motor is fixedly connected to the rear wall of the workbench through a fixed seat and is located within the range of the necking station. The first gear is fixedly connected to the outer wall of one end of the clamping pipe extending below the movable plate. The second gear is fixedly connected to the end of the motor's protruding shaft. When the movable plate is driven by the guide rail drive device to move to the necking station, the first gear meshes with the second gear.

[0010] Preferably, the lifting drive structure is an electric telescopic rod. The electric telescopic rod is fixedly connected to the upper wall of the mounting frame and is close to the front wall of the mounting frame. The end of the protruding shaft of the electric telescopic rod penetrates through the inner wall of the mounting frame and extends below the mounting frame. The end of the electric telescopic rod extending below the mounting frame is fixedly connected to the upper wall of the guide rail cover. The mounting frame is driven to rise and fall by the electric telescopic rod.

[0011] Preferably, the guiding structure includes two groups of guiding rods. Both groups of guiding rods are fixedly connected to the upper wall of the guide rail cover and are respectively located on the left and right sides of the lifting drive structure. The ends of the two groups of guiding rods far from the guide rail cover penetrate through the inner wall of the mounting frame and are both slidably connected to the mounting frame.

[0012] Preferably, the oil injection structure includes an oil injection ring and multiple groups of oil injection holes. The oil injection ring is fixedly connected to the rear end of the mounting frame. When the movable plate is driven by the guide rail drive device to move to the oil injection station, the clamping pipe on the movable plate is vertically opposite to the oil injection ring. Multiple groups of oil injection holes are all arranged on the inner side wall of the oil injection ring. The oil injection ring is connected to the outlet end of the oil pump through a hose. The inlet end of the oil pump is connected to the lubricating oil tank through a hose.

[0013] Preferably, an arc chamfer is provided between the inner side wall and the upper end of the clamping pipe to facilitate the entry of the pipe fitting.

[0014] Preferably, a polyurethane layer is provided on the inner side wall of the clamping pipe to prevent the outer wall of the pipe fitting from being worn.

[0015] A production method of a pipe fitting necking production device, using the above-mentioned pipe fitting necking production device for production. The production method includes the following steps:

[0016] S1. Feeding: Insert the pipe fitting from the upper mouth of the clamping pipe in the feeding station through the feeding manipulator until the lower end of the pipe fitting abuts against the inner lower wall of the clamping pipe. Then, drive the annular guide rail to move through the guide rail drive device, driving the clamping pipe with the pipe fitting to move to the oil injection station.

[0017] S2. Oil injection: After the clamping pipe with the pipe fitting moves to the oil injection station, the protruding shaft of the electric telescopic rod retracts, driving the mounting frame to descend, and further driving the oil injection ring to descend. During the descent of the oil injection ring, the oil pump extracts lubricating oil from the lubricating oil tank and sprays it on the outer wall of the upper end of the pipe fitting exposed above the clamping pipe through multiple groups of oil injection holes.

[0018] S3. Necking-down: After the oil spraying is completed, the movable plate is driven by the guide rail driving device to move into the necking-down station. The hydraulic driver drives multiple sets of die petals in the necking-down die to move towards the upper end of the pipe fitting. The hydraulic driver drives the multiple sets of die petals to move downward. Due to the taper between the multiple sets of die petals and the frame, a shrinking action is formed while the multiple sets of die petals move downward, thereby forming a necking-down action of radially squeezing the upper end of the pipe fitting. The necking-down action is completed in three times. Between every two necking-down actions, the clamping pipe is driven to rotate along the axis of the clamping pipe by the motor and the second gear. The rotation angle of the clamping pipe is 360° divided by half of the number of die petals. The hydraulic driver maintains the pressure for three to five seconds when the last necking-down action is completed to eliminate the springback. The clamping pipe adapts to the downward movement of the pipe fitting driven by the necking-down action of the necking-down die through the elastic force of the spring and resets through the elastic force of the spring after the action is completed;

[0019] S4. Unloading: After the necking-down action is completed, the movable plate is driven by the guide rail driving device to move into the unloading station, and the necked-down pipe fitting is taken out of the clamping pipe by the unloading robot.

[0020] The present invention provides a pipe fitting necking-down production device and method. It has the following beneficial effects:

[0021] Compared with the prior art, this pipe fitting necking-down production device, through the collaborative design of the annular guide rail, the movable plate driven by the servo motor, the clamping pipe and the loading and unloading robot, realizes the automatic cyclic flow of the pipe fitting among the necking-down station, the oil spraying station and the loading and unloading station; the continuous indexing movement of the movable plate along the annular guide rail is accurately matched with the processing rhythm of the hydraulic driver driving the necking-down die, breaking through the efficiency bottleneck of traditional manual loading and unloading, especially suitable for large-scale production scenarios, and at the same time eliminating the positioning error and safety risk brought by manual operation.

[0022] Compared with the prior art, this pipe fitting necking-down production device, through the floating structure between the clamping pipe and the movable plate, enables the clamping pipe to have the ability of axial floating compensation when bearing the radial pressure of the necking-down die; the elastic deformation of the spring can adaptively absorb the axial displacement of the pipe fitting, and the rotating structure of the double rotating seats allows the clamping pipe to deflect slightly, effectively solving the problem of misalignment between the pipe fitting and the die caused by the rigid clamping of the traditional robot.

[0023] Compared with the prior art, this pipe fitting necking-down production device, through the sequential linkage control of the rotation driving structure set at the necking-down station and the hydraulic driver, realizes the precise indexing rotation during the three necking-down processes; among them, the rotation angle of the clamping pipe during the interval of the necking-down action is 360° divided by half of the number of die petals, ensuring the uniform distribution of the multi-pass necking-down deformation. Combining with the pressure maintaining and springback eliminating mechanism after the last necking-down, it fundamentally solves the problem of excessive ovality of the pipe orifice.

[0024] Compared with the prior art, the pipe fitting necking production device adopts a lifting oil spraying ring structure. Through the circumferential array layout of multiple oil spraying holes and the quantitative control of the oil transfer pump, the annular atomized spraying of the pipe fitting necking section is realized; during the descending process of the oil spraying ring, the dynamic spacing with the pipe fitting is coordinated, which not only ensures the uniform coverage of the lubricant on the outer wall of the pipe fitting, but also avoids excessive splashing through the programmed control of the oil spraying duration, making the friction coefficient stable and controllable while reducing the consumption of the lubricant. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the present invention;

[0026] Figure 2 is the present invention Figure 1 is a partial enlarged view of part A in the present invention;

[0027] Figure 3 is the present invention Figure 1 is a partial enlarged view of part B in the present invention;

[0028] Figure 4 is a partial schematic diagram of the movable plate, clamping pipe and flange connection structure of the present invention;

[0029] Figure 5 is a partial side cross-sectional view of the necking station of the present invention;

[0030] Figure 6 is a partial cross-sectional view of the clamping pipe and flange connection structure of the present invention.

[0031] Among them, 1, support; 2, workbench; 3, hydraulic tank; 4, machine head; 5, hydraulic actuator; 6, guide rail cover; 7, movable plate; 8, clamping pipe; 9, flange; 10, spring; 11, first gear; 12, first rotating seat; 13, second rotating seat; 14, guide rod; 15, mounting frame; 16, electric telescopic rod; 17, oil spraying ring; 18, oil spraying hole; 19, fixed seat; 20, motor; 21, second gear; 22, polyurethane layer; 23, arc chamfer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0033] As Figures 1 to 6As shown in the figure, an embodiment of the present invention provides a pipe fitting necking production device, including a pipe fitting, a workbench 2, a hydraulic tank 3, an annular guide rail, a guide rail driving device, a lubricating oil tank, an oil transfer pump, a loading manipulator, an unloading manipulator, a control device, a necking die, and multiple groups of alignment sensors;

[0034] To achieve the automatic cyclic transfer of the pipe fitting among the necking, oil spraying, loading, and unloading stations, a guide rail cover 6 is fixedly connected to the upper wall of the workbench 2. The annular guide rail is arranged on the upper wall of the workbench 2 and inside the guide rail cover 6. The annular guide rail is driven to rotate by a guide rail driving device, which is composed of a servo motor, a sprocket, and a chain. Multiple groups of movable plates 7 are arranged on the outer wall of the annular guide rail. The workbench 2 and the hydraulic tank 3 are respectively supported by a group of brackets 1. The hydraulic tank 3 is located directly behind the workbench 2. A machine head 4 is fixedly connected to the upper wall of the hydraulic tank 3, and the front end of the machine head 4 extends towards the front wall of the hydraulic tank 3. A hydraulic driver 5 is arranged on the upper wall of the machine head 4 and near the front end. The necking die is arranged on the lower wall of the machine head 4 and on the front side of the hydraulic tank 3. The necking die is composed of a frame and multiple die segments arranged on the inner side wall of the frame. The multiple die segments are driven by the hydraulic driver 5 to radially contract. The front side of the workbench 2 is successively provided with an unloading station, a first empty station, and a loading station from right to left. The rear side of the workbench 2 is successively provided with an oil spraying station, a necking station, and a second empty station from left to right. The loading manipulator and the unloading manipulator respectively correspond to the positions of the loading station and the unloading station. The movable plate 7 is driven by the guide rail driving device to successively pass through the loading station, the oil spraying station, the necking station, the second empty station, the unloading station, and the first empty station. This structure enables the continuous indexing movement of the movable plate 7 along the annular guide rail to match the hydraulic processing rhythm, combines the alignment sensors to control the movement position accuracy, breaks through the efficiency bottleneck of traditional manual loading and unloading, and eliminates the positioning error and safety risk caused by manual operation;

[0035] To improve the clamping stability and surface protection performance of the pipe fitting, a clamping tube 8 for placing the pipe fitting body is arranged at one end of the movable plate 7 away from the annular guide rail. An arc chamfer 23 for facilitating the entry of the pipe fitting is arranged between the inner side wall and the upper end of the clamping tube 8. A polyurethane layer 22 for preventing the outer wall of the pipe fitting from being worn is arranged on the inner side wall of the clamping tube 8. The smooth surface of the polyurethane layer 22 can prevent the outer wall of the non-necked part of the pipe fitting from being worn. The arc chamfer 23 guides automatic centering, improves the loading positioning accuracy, and avoids surface scratches;

[0036] To achieve axial floating compensation for the clamping tube 8, the clamping tube 8 penetrates through the movable plate 7 and is slidably connected thereto. A floating structure is provided between the clamping tube 8 and the movable plate 7. The floating structure includes a flange 9, a first rotating seat 12, a second rotating seat 13, and a spring 10. The flange 9 is fixedly connected to the circumferential outer wall of the clamping tube 8 and is close to the upper end of the clamping tube 8. The second rotating seat 13 is rotatably connected to the lower wall of the flange 9. The first rotating seat 12 is rotatably connected to the inner wall of the end of the movable plate 7 away from the annular guide rail. The clamping tube 8 penetrates through the inner wall of the second rotating seat 13 and is slidably connected thereto. The spring 10 is sleeved on the outer wall of the clamping tube 8 and is located between the first rotating seat 12 and the second rotating seat 13. The elastic deformation of the spring 10 absorbs the axial displacement, and the rotating structures of the first rotating seat 12 and the second rotating seat 13 allow for a slight deflection of the clamping tube 8, solving the alignment deviation caused by traditional rigid clamping;

[0037] To achieve indexing rotation control for multi-pass necking, a rotation drive structure for driving the clamping tube 8 to rotate is provided between the end of the clamping tube 8 extending below the movable plate 7 and the outer wall of the workbench 2. The rotation drive structure corresponds to the necking station in position, and the necking station is aligned vertically with the necking die. The rotation drive structure includes a motor 20, a first gear 11, and a second gear 21. The motor 20 is fixedly connected to the rear wall of the workbench 2 through a fixing seat 19 and is within the range of the necking station. The first gear 11 is fixedly connected to the outer wall of the end of the clamping tube 8 extending below the movable plate 7. The second gear 21 is fixedly connected to the end of the extending shaft of the motor 20. When the movable plate 7 is driven by the guide rail drive device to move to the necking station, the first gear 11 meshes with the second gear 21. The rotation angle is controlled through an algorithm to ensure uniform distribution of the three-pass necking deformation, and the ovality exceeding the standard is eliminated in cooperation with the pressure-holding and spring-removing mechanism;

[0038] To accurately control the lifting and positioning of the oil injection ring 17, an installation frame 15 is slidably connected to the upper wall of the guide rail cover 6 through a guiding structure. A lifting drive structure for driving the installation frame 15 to lift and lower is provided between the installation frame 15 and the guide rail cover 6. The lifting drive structure is an electric telescopic rod 16. The electric telescopic rod 16 is fixedly connected to the upper wall of the installation frame 15 and is close to the front wall of the installation frame 15. The end of the extending shaft of the electric telescopic rod 16 penetrates through the inner wall of the installation frame 15 and extends below the installation frame 15. The end of the electric telescopic rod 16 extending below the installation frame 15 is fixedly connected to the upper wall of the guide rail cover 6. The installation frame 15 is driven to rise and fall by the electric telescopic rod 16. The guiding structure includes two groups of guiding rods 14. The two groups of guiding rods 14 are both fixedly connected to the upper wall of the guide rail cover 6 and are respectively located on the left and right sides of the lifting drive structure. The ends of the two groups of guiding rods 14 away from the guide rail cover 6 penetrate through the inner wall of the installation frame 15 and are both slidably connected to the installation frame 15. The guiding rods 14 ensure the vertical lifting accuracy, and the electric telescopic rod 16 realizes the dynamic distance control between the oil injection ring 17 and the pipe fitting, ensuring uniform lubricant coverage;

[0039] To achieve the annular atomizing spraying of the reduced diameter section of the pipe fitting, an oil spraying structure for spraying lubricating oil is provided at the rear end of the mounting frame 15. The oil spraying structure corresponds to the oil spraying station in terms of position. The oil spraying structure includes an oil spraying ring 17 and multiple groups of oil spraying holes 18. The oil spraying ring 17 is fixedly connected to the rear end of the mounting frame 15. When the movable plate 7 is driven by the guide rail driving device to move to the oil spraying station, the clamping pipe 8 on the movable plate 7 is vertically opposite to the oil spraying ring 17. Multiple groups of oil spraying holes 18 are all arranged on the inner side wall of the oil spraying ring 17. The oil spraying ring 17 is connected to the outlet end of the oil transfer pump through a hose, and the inlet end of the oil transfer pump is connected to the lubricating oil tank through a hose. The circumferentially arrayed oil spraying holes 18 form an atomized oil film, and the programmed control of the oil spraying duration significantly reduces the consumption of the lubricant.

[0040] This embodiment also provides a production method for a pipe fitting reducing device. Using the above-mentioned pipe fitting reducing device for production, the production method includes the following steps:

[0041] S1. Feeding: Insert the pipe fitting into the upper opening of the clamping pipe 8 in the feeding station through the feeding manipulator until the lower end of the pipe fitting abuts against the inner lower wall of the clamping pipe 8. Then, drive the annular guide rail to move through the guide rail driving device, driving the clamping pipe 8 equipped with the pipe fitting to move to the oil spraying station.

[0042] S2. Oil spraying: After the clamping pipe 8 equipped with the pipe fitting moves to the oil spraying station, the extending shaft of the electric telescopic rod 16 retracts, driving the mounting frame 15 to descend, and further driving the oil spraying ring 17 to descend. During the descent of the oil spraying ring 17, the oil transfer pump extracts lubricating oil from the lubricating oil tank and sprays it on the outer wall of the upper end of the pipe fitting exposed above the clamping pipe 8 through multiple groups of oil spraying holes 18.

[0043] S3. Reducing diameter: After the oil spraying is completed, the movable plate 7 is driven by the guide rail driving device to move into the reducing diameter station. The hydraulic driver 5 drives multiple groups of die petals in the reducing diameter die to move towards the upper end of the pipe fitting. The hydraulic driver 5 drives multiple groups of die petals to move downward. Due to the taper between multiple groups of die petals and the frame, a shrinking action is formed while the multiple groups of die petals move downward, thereby forming a reducing diameter action of radially squeezing the upper end of the pipe fitting. The reducing diameter action is completed in three times. Between every two reducing diameter actions, the clamping pipe 8 is driven to rotate along the axis of the clamping pipe 8 by the motor 20 and the second gear 21. The rotation angle of the clamping pipe 8 is one-half of 360° divided by the number of die petals. The hydraulic driver 5 maintains the pressure for three to five seconds when the last reducing diameter action is completed to eliminate the springback. The clamping pipe 8 adapts to the downward movement of the pipe fitting driven by the reducing diameter die of the reducing diameter die through the elasticity of the spring 10 and is reset by the elasticity of the spring 10 after the action is completed.

[0044] S4. Unloading: After the reducing diameter action is completed, the movable plate 7 is driven by the guide rail driving device to move into the unloading station, and the pipe fitting after reducing diameter is taken out of the clamping pipe 8 through the unloading manipulator.

[0045] Working principle: The continuous indexing movement of the movable plate 7 along the annular guide rail matches the hydraulic processing rhythm, breaking through the efficiency bottleneck of traditional manual loading and unloading, and eliminating the positioning errors and safety risks caused by manual operation; the smooth surface of the polyurethane layer 22 can avoid the outer wall wear of the non-necked part of the pipe fitting, and the arc chamfer 23 guides automatic centering, improving the loading positioning accuracy and avoiding surface scratches; the elastic deformation of the spring 10 absorbs the axial displacement, and the spherical hinge structures of the first rotating seat 12 and the second rotating seat 13 allow the clamped pipe 8 to deflect slightly, solving the alignment deviation caused by traditional rigid clamping; the rotation angle of the pipe fitting is controlled by an algorithm to ensure uniform distribution of the three necking deformations, and the ovality exceeding the standard is eliminated by cooperating with the pressure-holding and elastic-deformation-eliminating mechanism; the guide rod 14 ensures the vertical lifting accuracy, and the electric telescopic rod 16 realizes the dynamic distance control between the oil injection ring 17 and the pipe fitting, ensuring uniform lubricant coverage; the circumferentially arrayed oil injection holes 18 form an atomized oil film, and the programmed control of the oil injection duration can significantly reduce the consumption of the lubricant.

[0046] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipe fitting necking production device, characterized in that: It includes pipe fittings, a workbench (2), a hydraulic tank (3), an annular guide rail, a guide rail driving device, a lubricating oil tank, an oil transfer pump, a loading manipulator, an unloading manipulator, a control device, a necking die, and multiple groups of alignment sensors. The upper wall of the workbench (2) is fixedly connected with a guide rail cover (6). The annular guide rail is arranged on the upper wall of the workbench (2) and is located inside the guide rail cover (6). The annular guide rail is driven to rotate by the guide rail driving device. The guide rail driving device is composed of a servo motor, a sprocket, and a chain. Multiple groups of movable plates (7) are arranged on the outer wall of the annular guide rail. One end of the movable plate (7) far from the annular guide rail is provided with a clamping pipe (8) for placing the pipe fitting body. The clamping pipe (8) penetrates through the movable plate (7) and is slidably connected therewith. A floating structure is arranged between the clamping pipe (8) and the movable plate (7). One end of the clamping pipe (8) extending below the movable plate (7) and the outer wall of the workbench (2) are provided with a rotation driving structure for driving the clamping pipe (8) to rotate. The upper wall of the guide rail cover (6) is slidably connected with a mounting frame (15) through a guiding structure. A lifting driving structure for driving the mounting frame (15) to lift is arranged between the mounting frame (15) and the guide rail cover (6). The rear end of the mounting frame (15) is provided with an oil spraying structure for spraying lubricating oil; The workbench (2) and the hydraulic tank (3) are respectively supported by a group of brackets (1). The hydraulic tank (3) is located directly behind the workbench (2). The upper wall of the hydraulic tank (3) is fixedly connected with a machine head (4). The front end of the machine head (4) extends towards the front wall of the hydraulic tank (3). A hydraulic driver (5) is arranged on the upper wall of the machine head (4) and near the front end position. The necking die is arranged on the lower wall of the machine head (4) and is located on the front side of the hydraulic tank (3). The necking die is composed of a frame and multiple die segments arranged on the inner side wall of the frame. Multiple groups of the die segments are driven by the hydraulic driver (5) to radially contract. The front side of the workbench (2) is successively provided with an unloading station, a first empty station, and a loading station from right to left. The rear side of the workbench (2) is successively provided with an oil spraying station, a necking station, and a second empty station from left to right. The loading manipulator and the unloading manipulator respectively correspond to the positions of the loading station and the unloading station. The oil spraying structure corresponds to the position of the oil spraying station. The rotation driving structure corresponds to the position of the necking station and the necking station is vertically aligned with the necking die. The movable plate (7) is driven by the guide rail driving device to sequentially pass through the loading station, the oil spraying station, the necking station, the second empty station, the unloading station, and the first empty station; The floating structure includes a flange (9), a first rotating seat (12), a second rotating seat (13), and a spring (10). The flange (9) is fixedly connected to the circumferential outer wall of the clamping pipe (8) and near the upper end of the clamping pipe (8). The second rotating seat (13) is rotatably connected to the lower wall of the flange (9). The first rotating seat (12) is rotatably connected to the inner wall of the end of the movable plate (7) away from the annular guide rail. The clamping pipe (8) passes through the inner wall of the second rotating seat (13) and is slidably connected thereto. The spring (10) is sleeved on the outer wall of the clamping pipe (8) and is located between the first rotating seat (12) and the second rotating seat (13). The rotation driving structure includes a motor (20), a first gear (11), and a second gear (21). The motor (20) is fixedly connected to the rear wall of the workbench (2) through a fixed seat (19) and is within the range of the necking station. The first gear (11) is fixedly connected to the outer wall of the end of the clamping pipe (8) extending below the movable plate (7). The second gear (21) is fixedly connected to the end of the protruding shaft of the motor (20). When the movable plate (7) is driven by the guide rail driving device to move to the necking station, the first gear (11) meshes with the second gear (21). The lifting driving structure is an electric telescopic rod (16). The electric telescopic rod (16) is fixedly connected to the upper wall of the mounting frame (15) and near the front wall of the mounting frame (15). The end of the protruding shaft of the electric telescopic rod (16) passes through the inner wall of the mounting frame (15) and extends below the mounting frame (15). The end of the electric telescopic rod (16) extending below the mounting frame (15) is fixedly connected to the upper wall of the guide rail cover (6). The mounting frame (15) is driven to rise and fall by the electric telescopic rod (16). The oil injection structure includes an oil injection ring (17) and multiple groups of oil injection holes (18). The oil injection ring (17) is fixedly connected to the rear end of the mounting frame (15). When the movable plate (7) is driven by the guide rail driving device to move to the oil injection station, the clamping pipe (8) on the movable plate (7) is vertically opposite to the oil injection ring (17). Multiple groups of the oil injection holes (18) are all arranged on the inner side wall of the oil injection ring (17). The oil injection ring (17) is connected to the outlet end of the oil transfer pump through a hose. The inlet end of the oil transfer pump is connected to the lubricating oil tank through a hose.

2. The pipe fitting necking production device according to claim 1, characterized in that: The guiding structure includes two groups of guiding rods (14). Both groups of the guiding rods (14) are fixedly connected to the upper wall of the guide rail cover (6) and are respectively located on the left and right sides of the lifting driving structure. The ends of the two groups of guiding rods (14) away from the guide rail cover (6) pass through the inner wall of the mounting frame (15) and are both slidably connected to the mounting frame (15).

3. The pipe fitting necking production device according to claim 2, characterized in that: An arc chamfer (23) for facilitating the entry of the pipe fitting is provided between the inner side wall and the upper end of the clamping pipe (8).

4. The pipe fitting necking production device according to claim 3, characterized in that: A polyurethane layer (22) for preventing the outer wall of the pipe fitting from being worn is provided on the inner side wall of the clamping pipe (8).

5. A production method of a pipe fitting necking production device, which uses the pipe fitting necking production device described in any one of claims 1 to 4 for production, and is characterized in that: The production method includes the following steps: S1. Loading: The pipe fitting is inserted into the upper opening of the clamping pipe (8) in the loading station by the loading manipulator until the lower end of the pipe fitting abuts against the inner lower wall of the clamping pipe (8). Then, the ring rail is driven to move by the rail driving device, driving the clamping pipe (8) with the pipe fitting to move to the oil spraying station. S2. Oil spraying: After the clamping pipe (8) with the pipe fitting moves to the oil spraying station, the extending shaft of the electric telescopic rod (16) retracts, driving the mounting frame (15) to descend, and further driving the oil spraying ring (17) to descend. During the descent of the oil spraying ring (17), the oil transfer pump extracts lubricating oil from the lubricating oil tank and sprays it onto the outer wall of the upper end of the pipe fitting exposed above the clamping pipe (8) through multiple groups of oil spraying holes (18). S3. Necking: After the oil spraying is completed, the movable plate (7) is driven by the rail driving device to move into the necking station. The hydraulic driver (5) drives multiple groups of die petals in the necking die towards the upper end of the pipe fitting. The hydraulic driver (5) drives the multiple groups of die petals to move downward. Due to the taper between the multiple groups of die petals and the frame, a shrinking action is formed while the multiple groups of die petals move downward, thereby forming a necking action of radially squeezing the upper end of the pipe fitting. The necking action is completed in three times. During the interval between every two necking actions, the clamping pipe (8) is driven to rotate along the axis of the clamping pipe (8) by the motor (20) and the second gear (21). The rotation angle of the clamping pipe (8) is one-half of 360° divided by the number of die petals. The hydraulic driver (5) maintains the pressure for three to five seconds when the last necking action is completed to eliminate springback. The clamping pipe (8) adapts to the downward movement of the pipe fitting driven by the necking die during the necking action of the necking die and is reset by the elastic force of the spring (10) after the action is completed. S4. Unloading: After the necking action is completed, the movable plate (7) is driven by the rail driving device to move into the unloading station. The necked pipe fitting is taken out of the clamping pipe (8) by the unloading manipulator.

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