Pipeline end connecting thread rolling device
By designing a thread rolling device for connecting pipe ends, and adopting a thread rolling fluid supply system with a V-shaped support structure and a one-way valve, the problems of strength reduction and thread rolling fluid waste caused by traditional cutting processing are solved, achieving efficient and economical thread processing results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TIBET XUEFENG PIPE IND CO LTD
- Filing Date
- 2026-02-25
- Publication Date
- 2026-05-01
AI Technical Summary
Traditional cutting processes lead to reduced pipe connection strength and material waste. Furthermore, existing thread rolling equipment has unsatisfactory cooling effects or wastes thread rolling fluid, affecting thread quality and die life.
A thread rolling device for connecting pipe ends was designed, comprising a thread rolling mechanism and a support mechanism. The pipe is fixed by a V-shaped support structure, the movement of the support is controlled by an electric telescopic cylinder, and the thread rolling fluid is synchronously supplied and segmentedly output by a one-way guide valve and an elastic liquid bladder to avoid waste.
It achieves efficient thread rolling for pipe connections, improves connection strength, reduces material waste, improves cooling effect, and extends mold life.
Smart Images
Figure CN121945664A_ABST
Abstract
Description
A thread rolling device for connecting pipe ends Technical Field
[0001] This invention relates to the field of pipe thread rolling devices, and more particularly to a pipe end connection thread rolling device. Background Technology
[0002] Most pipeline transportation systems rely on metal pipe connections, and the quality of the threading at the pipe ends directly affects the sealing, strength, and service life of the pipe connections.
[0003] Traditional machining processes create threads by removing material, which not only requires pipe walls to meet certain standards to ensure connection strength but also increases material costs. During the machining process, the flow lines of the internal metal structure at the threaded section are cut off, thinning the pipe wall and reducing the strength of the pipe joint, making it prone to leaks, spills, and other problems during use. Furthermore, the metal shavings generated during machining not only waste resources but may also pollute the environment.
[0004] Thread rolling technology is a non-cutting process that uses cold extrusion to plastically deform the workpiece to form threads, which solves the above problems well. However, conventional thread rolling equipment still has the following shortcomings: the heat and friction generated during the thread rolling process will reduce the die life and thread quality, and existing equipment often lacks an efficient thread rolling fluid application mechanism, resulting in unsatisfactory cooling effect; or continuous fluid addition will cause waste of thread rolling fluid. Summary of the Invention
[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a thread rolling device for connecting pipe ends.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: a pipe end connection thread rolling device, comprising a thread rolling mechanism for rolling threads on the outer side of the pipe end to be processed, and a support mechanism for supporting and fixing the pipe to be processed from the inside; the support mechanism includes a moving frame and a moving control component, the support component being mounted on the moving frame; the moving control component is used to control the movement of the moving frame; the support component includes a mounting base, a central rod being mounted on the mounting base, an electric telescopic cylinder being fixed on the mounting base, a translational seat being fixed at the output end of the electric telescopic cylinder, the translational seat sliding on the outer wall of the central rod, an annular seat being fixed at the end of the central rod, and a rotating ring being rotatably mounted on both the annular seat and the translational seat; a support arm is hinged to the outer side of each rotating ring, the support arms of the two rotating rings cooperate to form a V-shaped structure, the ends of the two support arms forming the V-shaped structure are hinged together; and a support member is mounted on the hinge shaft.
[0007] As a preferred embodiment of the present invention: the support member includes a wheel frame, which is mounted on a hinge shaft, and anti-slip support wheels are mounted on the side of the wheel frame; a plurality of anti-slip support wheels are arranged in a circular pattern around the central rod.
[0008] As a preferred embodiment of the present invention: the motion control component includes a base frame, a motion control motor is mounted on one side of the base frame, a guide rod is mounted on the thread rolling motion rail frame, and a motion frame control screw is rotatably mounted on the thread rolling motion rail frame. A motion control motor for controlling the rotation of the motion frame control screw is mounted on one side of the thread rolling motion rail frame. The motion frame is threadedly connected to the outer wall of the motion frame control screw, and the motion frame is slidably connected to the outer wall of the guide rod.
[0009] As a preferred embodiment of the present invention, the thread rolling mechanism includes: a roller frame on which thread rolling rollers are mounted via roller shafts; a thread rolling control motor mounted on one side of the roller frame for controlling the rotation of the thread rolling rollers; and a movement control unit for controlling the movement of the two thread rolling rollers.
[0010] As a preferred embodiment of the present invention, the moving control unit includes: a thread rolling moving rail frame, wherein the roller frame is slidably connected to the groove of the thread rolling moving rail frame; a thread rolling moving motor, which is installed at one end of the thread rolling moving rail frame, and the output end of the thread rolling moving motor is connected to a roller frame control screw, which is threaded to the inner wall of the roller frame, wherein the two sections of the thread of the roller frame control screw connected to the two roller frames have opposite directions of rotation.
[0011] As a preferred embodiment of the present invention, a thread rolling liquid application mechanism is provided above the thread rolling roller. The thread rolling liquid application mechanism includes a liquid tank and linearly continuously distributed liquid application components. The linearly continuously distributed liquid application components are supplied with thread rolling liquid from the liquid tank and applied to the surface of the thread rolling roller.
[0012] As a preferred embodiment of the present invention: the liquid application component includes an elastic liquid bladder, a nozzle is provided at the bottom of the elastic liquid bladder, an elastic plug is provided inside the nozzle, and a plurality of micro-holes for output are provided on the elastic plug, the micro-holes remain sealed when not subjected to external force; end caps are provided at both ends of the elastic liquid bladder, and the end caps of adjacent liquid application components are fixedly connected; a liquid chamber and a liquid pump are provided inside the liquid tank, one end of the liquid pump is connected to the liquid chamber through a pipe, and the output end of the liquid pump is connected to the liquid application component through a connecting pipe.
[0013] As a preferred embodiment of the present invention: the connecting tube passes through the end cap at the farthest end of the support assembly and communicates with the interior of the elastic liquid bladder at the farthest end of the support assembly; a one-way valve is installed on the end cap of the adjacent liquid application assembly, and unidirectional liquid delivery is achieved based on the one-way valve; the pressure that makes the one-way valve open is less than the pressure that makes the micropore of the elastic plug open; an end tube is installed on the end cap near the farthest end of the support assembly, the end tube communicates with the corresponding elastic liquid bladder, and a control valve is provided on the end tube; a top rod is fixed on the central rod, and an extrusion member is fixed at the end of the top rod, and the liquid application assembly is located on the movement path of the extrusion member.
[0014] As a preferred embodiment of the present invention: the mounting frame is provided with multiple one-way slots, an annular frame is fixed to the outside of the end cap, connecting rings are fixed to both sides of the annular frame, a U-shaped frame is slidably connected inside the connecting ring, the U-shaped frame and the connecting ring are connected by a spring, when the one-way slots are engaged in the one-way slots based on the spring force, the bottom of the U-shaped frame is located inside the connecting ring and its height is lower than the center of the connecting ring; the extrusion member includes an extrusion plate and a first top post, the extrusion plate is fixed to the end of the top rod, and the first top post is fixed to both sides of the extrusion plate; the position of the first top post is adapted to the connecting ring; a second top post is connected to one side of the connecting ring through a connector, and the position of the second top post is adapted to the connecting ring.
[0015] As a preferred embodiment of the present invention, a receiving box is provided at the bottom of the thread rolling mechanism.
[0016] The beneficial effects of the present invention are as follows: 1. By setting up a support component, the present invention can place the pipe to be processed outside each support component. Based on the operation of the electric telescopic cylinder, the translation seat is pushed close to the annular seat, thereby reducing the included angle of the V-shaped structure and pushing the support component outward, thereby supporting and fixing the pipe to be processed from the inside to the outside.
[0017] 2. By setting up a thread rolling mechanism, the present invention can control the rotation of the roller frame and the screw based on the movement control unit. Since the two sections of the thread connecting the roller frame and the two roller frames have opposite directions of rotation, the two thread rolling rollers move closer to each other during rotation, and perform thread rolling on the middle pipe to be processed.
[0018] 3. This invention, by setting up a thread rolling fluid application mechanism, can deliver thread rolling fluid to each elastic liquid bladder through a liquid pump. Since the pressure that opens the one-way valve is less than the pressure that opens the micropores of the elastic plug, the thread rolling fluid can be injected into each elastic liquid bladder but will not spray out from the micropores of the elastic plug. When thread rolling is performed, based on the movement of the moving frame, the extrusion member at the end of the push rod squeezes the fluid application component. Due to the one-way valve, the internal pressure of the squeezed elastic liquid bladder increases, and the thread rolling fluid is then sprayed out from the micropores of the elastic plug; thus achieving the function of synchronous fluid supply.
[0019] 4. This invention, by setting up a one-way locking tooth, a first top post, a second top post, etc., enables the following when the moving frame moves: First, the first top post is inserted into the nearest connecting ring, which then squeezes the U-shaped frame, causing the one-way locking tooth to move downward and disengage from the one-way locking groove. At the same time, the current end cap is unlocked. Under the push of the compression plate, the corresponding elastic fluid bladder is squeezed, thereby causing the thread rolling fluid inside the elastic fluid bladder to spray out. After the current elastic fluid bladder is compressed, the second top post is inserted into the connecting ring at the next position, and the end cap at the next position is unlocked. This segmented unlocking allows the thread rolling fluid to be output gradually, avoiding waste. Attached Figure Description
[0020] Figure 1 is a structural schematic diagram of a pipe end connection thread rolling device proposed in this invention; Figure 2 is a structural schematic diagram of a pipe end connection thread rolling device proposed in this invention from another angle; Figure 3 is a structural schematic diagram of a support mechanism for a pipe end connection thread rolling device proposed in this invention; Figure 4 is a structural schematic diagram of a support assembly for a pipe end connection thread rolling device proposed in this invention; Figure 5 is a structural schematic diagram of a thread rolling roller for a pipe end connection thread rolling device proposed in this invention; Figure 6 is a structural schematic diagram of a liquid tank for a pipe end connection thread rolling device proposed in this invention; Figure 7 is a structural schematic diagram of an elastic liquid bladder for a pipe end connection thread rolling device proposed in this invention; Figure 8 is a cross-sectional structural schematic diagram of an elastic liquid bladder for a pipe end connection thread rolling device proposed in this invention.
[0021] In the diagram: 1-Moving frame; 2-Moving control motor; 3-Electric telescopic cylinder; 4-Pipe to be processed; 5-Thread rolling moving motor; 6-Liquid tank; 7-Thread rolling roller; 8-Roller frame; 9-Support frame; 10-Thread rolling moving rail frame; 11-Moving frame control screw; 12-Receiving box; 13-Base frame; 14-Top rod; 15-First top column; 16-Anti-slip support wheel; 17-Support arm; 18-Rotating ring; 19-Annular seat; 20-Wheel frame; 21-Center rod; 22-Annular elastic pad; 23-Mounting base; 24-Transfer base; 25-Thread rolling control motor; 26-Roller frame control screw; 27-Elastic liquid bladder; 28-Nozzle; 29-Connecting pipe; 30-Mounting bracket; 31-Spring; 32-U-shaped bracket; 33-Annular bracket; 34-End cap; 35-Connecting ring; 36-Second top column; 37-One-way locking tooth; 38-Control valve; 39-End pipe; 40-Connector; 41-Elastic plug; 42-One-way guide valve. Detailed Implementation
[0022] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.
[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0024] Example 1: A thread rolling device for connecting pipe ends, as shown in Figures 1-8, includes a thread rolling mechanism for rolling threads on the outer side of the end of a pipe 4 to be processed, and a support mechanism for supporting and fixing the pipe 4 to be processed from the inside. The support mechanism includes a movable frame 1 and a movement control assembly. The support assembly is mounted on the movable frame 1. The movement control assembly is used to control the movement of the movable frame 1. The support assembly includes a mounting base 23, a central rod 21 is mounted on the mounting base 23, an electric telescopic cylinder 3 is fixed on the mounting base 23, and a translation seat 24 is fixed to the output end of the electric telescopic cylinder 3. The translation seat 24 slides on the outer wall of the central rod 21. The end of the central rod 21... A ring seat 19 is fixed, and a rotating ring 18 is rotatably mounted on both the ring seat 19 and the translation seat 24. A support arm 17 is hinged to the outer side of each rotating ring 18. The support arms 17 of the two rotating rings 18 cooperate to form a V-shaped structure, and the ends of the two support arms 17 forming the V-shaped structure are hinged together. A support member is mounted on the hinge shaft. By setting the support assembly, the pipe 4 to be processed can be placed outside each support member. Based on the operation of the electric telescopic cylinder 3, the translation seat 24 is pushed closer to the ring seat 19, thereby reducing the included angle of the V-shaped structure and pushing the support member outward, thus supporting and fixing the pipe 4 to be processed from the inside of the pipe to the outside.
[0025] The mounting base 23 is movably mounted on the movable frame 1, and the mounting base 23 and the movable frame 1 are connected by an annular elastic pad 22.
[0026] For ease of support, as shown in Figures 3 and 4, the support includes a wheel frame 20, which is mounted on a hinge shaft. Anti-slip support wheels 16 are mounted on the side of the wheel frame 20. Multiple anti-slip support wheels 16 are arranged in a circular pattern around the central rod 21. The preferred number is three per group. When the thread rolling mechanism is used, the anti-slip support wheels 16 can support the pipe 4 to be processed from the inside out. The anti-slip support wheels 16 are made of anti-slip material to prevent the pipe 4 to be processed from sliding along the axial direction of the central rod 21. The structure can rotate based on the rotating ring 18, which can cooperate with the thread rolling operation to complete smoothly.
[0027] To facilitate the movement of the movable frame 1, as shown in Figures 1-3, the movement control assembly includes a base frame 13, a movement control motor 2 installed on one side of the base frame 13, a guide rod installed on the thread rolling movable rail frame 10, and a movable frame control screw 11 rotatably installed on the thread rolling movable rail frame 10. A movement control motor 2 for controlling the rotation of the movable frame control screw 11 is installed on one side of the thread rolling movable rail frame 10. The movable frame 1 is threadedly connected to the outer wall of the movable frame control screw 11, and the movable frame 1 is slidably connected to the outer wall of the guide rod.
[0028] For thread rolling operations, as shown in Figures 1, 2, and 5, the thread rolling mechanism includes: a roller frame 8, on which thread rolling rollers 7 are mounted via roller shafts; a thread rolling control motor 25, mounted on one side of the roller frame 8, for controlling the rotation of the thread rolling rollers 7; and a movement control unit, for controlling the movement of the two thread rolling rollers 7.
[0029] To facilitate control of the thread rolling rollers 7 to reach the processing position, as shown in Figures 2 and 5, the movement control unit includes: a thread rolling moving rail frame 10, with roller frames 8 slidably connected to the groove of the thread rolling moving rail frame 10; a thread rolling moving motor 5, which is installed at one end of the thread rolling moving rail frame 10, and the output end of the thread rolling moving motor 5 is connected to a roller frame control screw 26. The roller frame control screw 26 is threaded to the inner wall of the roller frame 8, and the two sections of the thread of the roller frame control screw 26 connected to the two roller frames 8 have opposite rotation directions. By setting up the thread rolling mechanism, the rotation of the roller frame control screw 26 can be controlled by the movement control unit. Since the two sections of the thread of the roller frame control screw 26 connected to the two roller frames 8 have opposite rotation directions, when rotating, the two thread rolling rollers 7 move closer to each other and perform thread rolling processing on the middle pipe 4 to be processed.
[0030] In order to apply the rolling fluid synchronously, as shown in Figures 2, 3, 6, 7 and 8, a rolling fluid application mechanism is provided above the rolling roller 7. The rolling fluid application mechanism includes a liquid tank 6 and linearly continuously distributed application components. A support frame 9 for fixing is provided on the outside of the liquid tank 6. The linearly continuously distributed application components are supplied with rolling fluid by the liquid tank 6 and applied to the surface of the rolling roller 7.
[0031] To facilitate the application of the rolling fluid, as shown in Figures 2, 3, 6, 7, and 8, the application component includes an elastic liquid bladder 27. A nozzle 28 is provided at the bottom of the elastic liquid bladder 27, and an elastic plug 41 is provided inside the nozzle 28. The elastic plug 41 is provided with multiple micro-holes for output, and the micro-holes remain sealed when not subjected to external force. End caps 34 are provided at both ends of the elastic liquid bladder 27, and the end caps 34 of adjacent application components are fixedly connected. A liquid chamber and a liquid pump are provided inside the liquid tank 6. One end of the liquid pump is connected to the liquid chamber through a pipe, and the output end of the liquid pump is connected to the application component through a connecting pipe 29.
[0032] To facilitate the application of the rolling fluid, as shown in Figures 2, 3, 6, 7, and 8, the connecting pipe 29 passes through the end cap 34 at the farthest end of the support assembly and communicates with the interior of the elastic liquid bladder 27 at the farthest end of the support assembly. A one-way valve 42 is installed on the end cap 34 of the adjacent fluid application assembly, enabling unidirectional fluid delivery based on the one-way valve 42. The pressure at which the one-way valve 42 is activated is less than the pressure at which the micropores of the elastic plug 41 are activated. An end pipe 39 is installed on the end cap 34 near the farthest end of the support assembly, communicating with the corresponding elastic liquid bladder 27, and a control valve 38 is provided on the end pipe 39. A top rod 14 is fixed on the central rod 21. An extrusion member is fixed at the end, and the liquid application component is located on the movement path of the extrusion member. By setting a thread rolling liquid application mechanism, the thread rolling liquid can be delivered to the interior of each elastic liquid bladder 27 by a liquid pump. Since the pressure that opens the one-way valve 42 is less than the pressure that opens the micro-hole of the elastic plug 41, the thread rolling liquid can be injected into each elastic liquid bladder 27, but will not be ejected from the micro-hole of the elastic plug 41. When thread rolling is performed, based on the movement of the moving frame 1, the extrusion member at the end of the push rod 14 extrudes the liquid application component. Due to the one-way valve 42, the pressure inside the extruded elastic liquid bladder 27 increases, and the thread rolling liquid is ejected from the micro-hole of the elastic plug 41. Thus, the function of synchronous liquid application is realized.
[0033] To facilitate better liquid delivery, as shown in Figures 7 and 8, the mounting bracket 30 is equipped with multiple one-way slots. An annular frame 33 is fixed to the outside of the end cap 34, and connecting rings 35 are fixed to both sides of the annular frame 33. A U-shaped frame 32 is slidably connected inside the connecting ring 35. The U-shaped frame 32 and the connecting ring 35 are connected by a spring 31. When the one-way locking teeth 37 are engaged in the one-way slots based on the force of the spring 31, the bottom of the U-shaped frame 32 is located inside the connecting ring 35, and its height is lower than the center of the connecting ring 35. The extrusion component includes an extrusion plate and a first top post 15. The extrusion plate is fixed to the end of the top rod 14, and the first top post 15 is fixed to both sides of the extrusion plate. The position of the first top post 15 is adapted to the connecting ring 35. One side of the connecting ring 35 is connected by a connector. The 40 is connected to a second top post 36, the position of which is adapted to the connecting ring 35. By setting up a structure such as a one-way locking tooth 37, a first top post 15, and a second top post 36, when the moving frame 1 moves, the first top post 15 first inserts into the nearest connecting ring 35, thereby squeezing the U-shaped frame 32, causing the one-way locking tooth 37 to move downward and disengage from the one-way locking groove, and at the same time unlocking the current end cover 34. Under the push of the squeezing plate, the corresponding elastic fluid bladder 27 is squeezed, thereby causing the thread rolling fluid in the elastic fluid bladder 27 to spray out. After the current elastic fluid bladder 27 is compressed, the second top post 36 inserts into the connecting ring 35 at the next position, and then unlocks the end cover 34 at the next position. In this way, the thread rolling fluid can be gradually output, avoiding waste.
[0034] As shown in Figure 1, a receiving box 12 is provided at the bottom of the thread rolling mechanism.
[0035] For the parts not disclosed in detail in this invention, such as necessary control modules, specific control methods, signal transmission methods, power supply methods, etc., those skilled in the art can ensure the smooth implementation of the solution of this invention based on common sense, normal thinking logic and existing technology.
[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A thread rolling device for connecting pipe ends, characterized in that, The system includes a thread rolling mechanism for rolling threads on the outer side of the end of the pipe (4) to be processed, and a support mechanism for supporting and fixing the pipe (4) to be processed from the inside. The support mechanism includes a moving frame (1) and a movement control assembly. The support assembly is mounted on the moving frame (1). The movement control assembly is used to control the movement of the moving frame (1). The support assembly includes a mounting base (23), a center rod (21) is mounted on the mounting base (23), and an electric telescopic cylinder (3) is fixed on the mounting base (23). The output end is fixed with a translation seat (24), which slides on the outer wall of the central rod (21). The end of the central rod (21) is fixed with an annular seat (19). A rotating ring (18) is rotatably installed on both the annular seat (19) and the translation seat (24). A support arm (17) is hinged to the outside of the rotating ring (18). The support arms (17) of the two rotating rings (18) cooperate to form a V-shaped structure. The ends of the two support arms (17) forming the V-shaped structure are hinged together. A support member is installed on the hinge shaft.
2. The pipe end connection thread rolling device according to claim 1, characterized in that, The support includes a wheel frame (20), which is mounted on a hinge shaft. Anti-slip support wheels (16) are mounted on the side of the wheel frame (20). Multiple anti-slip support wheels (16) are arranged in a circular pattern around the central rod (21).
3. A pipe end connection thread rolling device according to claim 1, characterized in that, The motion control assembly includes a base frame (13), a motion control motor (2) is installed on one side of the base frame (13), a guide rod is installed on the thread rolling motion rail frame (10), and a motion frame control screw (11) is rotatably installed on the thread rolling motion rail frame (10). A motion control motor (2) for controlling the rotation of the motion frame control screw (11) is installed on one side of the thread rolling motion rail frame (10). The motion frame (1) is threadedly connected to the outer wall of the motion frame control screw (11), and the motion frame (1) is slidably connected to the outer wall of the guide rod.
4. A pipe end connection thread rolling device according to claim 3, characterized in that, The thread rolling mechanism includes: a roller frame (8), on which a thread rolling roller (7) is mounted via a roller shaft; a thread rolling control motor (25), which is mounted on one side of the roller frame (8) and is used to control the rotation of the thread rolling roller (7); and a movement control unit, which is used to control the movement of the two thread rolling rollers (7).
5. A pipe end connection thread rolling device according to claim 4, characterized in that, The movement control unit includes: a thread rolling moving rail frame (10), a roller frame (8) slidably connected in the groove of the thread rolling moving rail frame (10); a thread rolling moving motor (5), which is installed at one end of the thread rolling moving rail frame (10), and the output end of the thread rolling moving motor (5) is connected to a roller frame control screw (26). The roller frame control screw (26) is threadedly connected to the inner wall of the roller frame (8), and the two sections of the thread of the roller frame control screw (26) connected to the two roller frames (8) have opposite directions of rotation.
6. A pipe end connection thread rolling device according to claim 1, characterized in that, A thread rolling liquid application mechanism is provided above the thread rolling roller (7). The thread rolling liquid application mechanism includes a liquid tank (6) and linearly continuously distributed liquid application components. The linearly continuously distributed liquid application components are supplied with thread rolling liquid by the liquid tank (6) and applied to the surface of the thread rolling roller (7).
7. A pipe end connection thread rolling device according to claim 6, characterized in that, The liquid application assembly includes an elastic liquid bladder (27), a nozzle (28) is provided at the bottom of the elastic liquid bladder (27), an elastic plug (41) is provided inside the nozzle (28), and multiple micro-holes for output are provided on the elastic plug (41). When no external force is applied, the micro-holes remain sealed. End caps (34) are provided at both ends of the elastic liquid bladder (27), and the end caps (34) of adjacent liquid application assemblies are fixedly connected. A liquid chamber and a liquid pump are provided inside the liquid tank (6). One end of the liquid pump is connected to the liquid chamber through a pipe, and the output end of the liquid pump is connected to the liquid application assembly through a connecting pipe (29).
8. A pipe end connection thread rolling device according to claim 7, characterized in that, The connecting tube (29) passes through the end cap (34) at the farthest end of the support assembly and communicates with the interior of the elastic liquid bladder (27) at the farthest end of the support assembly. A one-way valve (42) is installed on the end cap (34) of the adjacent liquid application assembly. Adjacent liquid application is based on the one-way valve (42) to achieve one-way liquid delivery. The pressure that makes the one-way valve (42) open is less than the pressure that makes the micropore of the elastic plug (41) open. An end tube (39) is installed on the end cap (34) near the farthest end of the support assembly. The end tube (39) communicates with the corresponding elastic liquid bladder (27) and a control valve (38) is provided on the end tube (39). A top rod (14) is fixed on the center rod (21). An extrusion member is fixed at the end of the top rod (14). The liquid application assembly is located on the movement path of the extrusion member.
9. A pipe end connection thread rolling device according to claim 8, characterized in that, The mounting bracket (30) is provided with multiple one-way slots. An annular frame (33) is fixed on the outside of the end cap (34). Connecting rings (35) are fixed on both sides of the annular frame (33). A U-shaped frame (32) is slidably connected inside the connecting ring (35). The U-shaped frame (32) and the connecting ring (35) are connected by a spring (31). When the one-way tooth (37) is locked in the one-way slot based on the force of the spring (31), the bottom of the U-shaped frame (32) is located inside the connecting ring (35) and its height is lower than the center of the connecting ring (35). The extrusion component includes an extrusion plate and a first top post (15). The extrusion plate is fixed to the end of the top rod (14), and the first top post (15) is fixed to both sides of the extrusion plate. The position of the first top post (15) is adapted to the connecting ring (35). A second top post (36) is connected to one side of the connecting ring (35) through a connector (40). The position of the second top post (36) is adapted to the connecting ring (35).
10. A pipe end connection thread rolling device according to claim 1, characterized in that, The bottom of the thread rolling mechanism is provided with a receiving box (12).