Cold heading forming method and forming equipment of explosion-proof high-pressure oil pipe joint

Abstract

The present application relates to the technical field of tubing joint cold heading forming, and discloses a cold heading forming method and forming equipment for an explosion-proof high-pressure tubing joint, which comprises a base, a vertical seat and a bottom clamping assembly close to the bottom of the vertical seat are fixed to the upper end of the base, a top clamping assembly is slidably connected to the vertical seat, the clamping cylinder body on the vertical seat pushes the top clamping assembly to move downward, so that the top clamping assembly is matched with the bottom clamping assembly to clamp the joint pipe raw material piece; a lifting and pushing-out assembly is arranged in the bottom clamping assembly, and a blocking and limiting assembly is arranged at the end of the bottom clamping assembly, the cooperation of the top clamping assembly and the bottom clamping assembly realizes the stable clamping of the joint pipe raw material piece, the linkage design of the blocking and limiting assembly and the lifting and pushing-out assembly is adopted, the blocking of the pipe end is automatically completed while the clamping moves downward, reliable axial support is provided for cold heading, an additional actuator is not needed, and the control logic is simplified.

Description

Technical Field

[0001] This invention relates to the field of cold heading forming technology for oil pipe joints, specifically to a cold heading forming method and forming equipment for explosion-proof high-pressure oil pipe joints. Background Technology

[0002] High-pressure oil pipe fittings are critical connecting components in hydraulic systems, and their sealing performance and structural strength directly affect system safety. Currently, these fittings are mostly manufactured using traditional machining methods, which suffer from drawbacks such as low material utilization, cumbersome processes, and low production efficiency. Machining easily disrupts the integrity of metal flow lines, weakens the joint strength, and the cutting process can easily create textures on the sealing surface, affecting the sealing effect.

[0003] While cold heading technology has been applied in some fastener production, offering advantages such as high production efficiency, high material utilization, and continuous metal flow lines, its application in explosion-proof high-pressure oil pipe fittings still faces numerous challenges. Existing cold heading equipment generally suffers from insufficient clamping reliability, inconvenient end-sealing of pipe fittings, and difficulties in demolding after forming, which restricts the promotion of cold heading technology in the field of high-pressure explosion-proof oil pipe fittings. Therefore, we introduce a cold heading method and equipment for explosion-proof high-pressure oil pipe fittings. Summary of the Invention

[0004] The purpose of this invention is to provide a cold heading forming method and forming equipment for explosion-proof high-pressure oil pipe joints, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cold heading forming equipment for explosion-proof high-pressure oil pipe joints, comprising a base, an upright and a bottom clamping assembly near the bottom of the upright fixed at the upper end of the base, a top clamping assembly slidably connected on the upright, and a clamping cylinder on the upright pushing the top clamping assembly downward, so that the top clamping assembly matches the bottom clamping assembly for clamping the joint pipe material. The bottom clamping assembly is equipped with a lifting and pushing assembly inside. The lifting and pushing assembly is connected to the top clamping assembly. When the top clamping assembly is moved upward and reset, the top clamping assembly drives the lifting and pushing assembly to move upward and push out the cold-forged joint tube raw material. The bottom clamping assembly is provided with a sealing and limiting assembly at its end. The sealing and limiting assembly is connected to the bottom side of the lifting and pushing assembly. When the top clamping assembly moves downward to match the bottom clamping assembly, the top clamping assembly drives the sealing and limiting assembly to rotate through the lifting and pushing assembly to seal the end of the joint pipe material. The upper end of the base is also slidably connected to a cold heading pressing component, which is used to cold heading and pressing the front end of the connector tube material.

[0006] Preferably, the cold heading pressing assembly includes a cold heading pressing moving base, an equipment box fixed at the upper end of the cold heading pressing moving base, a cold heading cylinder installed inside the equipment box, and a cold heading pressing head whose output end of the cold heading cylinder extends through the equipment box and is connected thereto.

[0007] Preferably, the upper end of the base is provided with two sets of parallel guide rails and a rack located between the two sets of guide rails. The cold heading pressing moving seat is slidably connected to the two sets of guide rails. A servo motor is also installed in the bottom of the cold heading pressing moving seat, and the drive gear at the output end of the servo motor meshes with the rack.

[0008] Preferably, the bottom clamping assembly includes a bottom receiving seat fixed to the upper end of the base with long bolts, and a bottom semi-circular clamping seat centrally located at the upper end of the bottom receiving seat; The top clamping assembly includes a top semi-circular clamp and a lifting connecting frame disposed on the upper end of the top semi-circular clamp. The lifting connecting frame is slidably connected to the inside of the stand, and the clamping piston rod at the output end of the clamping cylinder is fixed to the lifting connecting frame.

[0009] Preferably, the bottom receiving seat is further provided with a limiting post at its upper end, and the top semi-circular clamp is provided with a limiting seat on its side, with the limiting post extending through the corresponding limiting seat.

[0010] The sealing and limiting assembly includes a small gear rotatably connected to the end of the bottom semi-circular clamp by a first rotating shaft, a sealing plate fixed to the side of the small gear, a large gear rotatably connected to the end of the bottom receiving seat by a second rotating shaft, and a rotating arm fixed to the side of the large gear, wherein the small gear and the large gear mesh with each other.

[0011] Preferably, the lifting and ejecting assembly includes a lifting column disposed in a reserved hole on the bottom semi-circular clamp and a connecting seat connected to the bottom of the lifting column by a connecting arm; The top of the lifting column is provided with an arc-shaped groove; The bottom of the lifting connecting frame is provided with two sets of connecting ears, and the upper part of the connecting seat is provided with a first shaft, which slides into the first sliding groove on the connecting ear; The bottom of the bottom receiving seat is provided with a receiving groove, the bottom of the reserved hole is connected to the receiving groove, and the connecting arm is located in the receiving groove; The connecting arm is provided with a second shaft on its side. The second shaft extends through the side groove at the end of the bottom receiving seat and slides into the second sliding groove on the rotating arm.

[0012] Preferably, the stand has a top cavity, a middle groove and a bottom groove arranged from top to bottom inside, the clamping cylinder is located in the top cavity and the clamping cylinder is fixed to the top of the middle groove; The lifting connecting frame slides into the middle sliding groove, and the side of the upright is also provided with an end cover for covering the top cavity and the middle sliding groove. The lifting connecting frame extends out through a reserved groove on the end cover. The connecting arm slides into the bottom groove.

[0013] This invention also provides a forming method for a cold heading forming device for explosion-proof high-pressure oil pipe joints, specifically including the following steps: S1. Place the connector pipe material on the bottom clamping assembly, and the clamping cylinder pushes the top clamping assembly down until the top clamping assembly and the bottom clamping assembly cooperate to clamp and fix the connector pipe material. S2. As the top clamping assembly moves down, the lifting and pushing assembly drives the sealing and limiting assembly to rotate, thereby sealing the end of the joint pipe material. S3. The front end of the joint pipe material is cold-forged and formed using a cold-forging pressing assembly. S4. When the top clamping assembly moves up and resets, the top clamping assembly drives the lifting and pushing assembly to move up and push out the cold-forged joint tube raw material. At the same time, the sealing and limiting assembly rotates and resets.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the present invention achieves stable clamping of the joint pipe raw material by cooperating with the top clamping component and the bottom clamping component, ensuring that the workpiece does not shift during the cold heading process, which is conducive to ensuring the forming accuracy and the coaxiality of the sealing surface.

[0015] This invention employs a linkage design between the sealing and limiting component and the lifting and ejecting component, which automatically seals the end of the pipe fitting while it is being clamped and moved downwards, providing reliable axial support for cold heading. No additional actuator is required, simplifying the control logic.

[0016] This invention utilizes the reciprocating motion of the clamping cylinder to synchronously drive the lifting column to complete the demolding and ejection, realizing an automated cycle of "clamping - sealing - cold heading - ejection", reducing manual intervention and improving production efficiency and operational safety.

[0017] The cold heading method of this invention avoids the damage to the metal flow lines caused by machining, which is beneficial to improving joint strength and fatigue life, while reducing material waste and manufacturing costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the invention in its initial state; Figure 2 This is a schematic diagram of the cold heading pressing assembly and the base of the present invention; Figure 3 This is a schematic diagram of the structure of the cold heading cylinder block of the present invention; Figure 4 For the present invention Figure 1 A schematic diagram of the three-dimensional structure from another perspective; Figure 5 For the present invention Figure 4 A partial structural diagram of the center sealing and limiting component; Figure 6 This is a schematic diagram of the structure for mounting the cylinder body according to the present invention; Figure 7 This is a schematic diagram showing the connection between the top clamping assembly, the bottom clamping assembly, the blocking and limiting assembly, and the lifting and pushing assembly in the initial state of the present invention. Figure 8 For the present invention Figure 7 A schematic diagram showing the connection between the top clamping assembly and the lifting and ejection assembly; Figure 9 This is a schematic diagram of the bottom clamping assembly of the present invention; Figure 10 This is a structural schematic diagram of the matching state of the top clamping component and the bottom clamping component of the present invention; Figure 11 For the present invention Figure 10 A schematic diagram of the three-dimensional structure from another perspective; Figure 12 For the present invention Figure 10 A schematic diagram showing the connection between the bottom clamping assembly, the sealing and limiting assembly, and the lifting and ejecting assembly; Figure 13 For the present invention Figure 10 A schematic diagram showing the connection between the top clamping assembly, the bottom clamping assembly, the sealing and limiting assembly, and the lifting and ejecting assembly.

[0019] In the diagram: 1. Base; 2. Stand; 3. Guide rail; 4. Rack; 5. Cold heading pressing moving seat; 6. Equipment box; 7. Bottom receiving seat; 8. Top semi-circular clamp; 9. Lifting connecting frame; 10. Bottom semi-circular clamp; 11. End cover; 12. Cold heading pressing head; 13. Servo motor; 14. Drive gear; 15. Cold heading cylinder; 16. Sealing plate; 17. Large gear; 18. Lifting column; 19. Limiting column; 20. Limiting seat; 21. First rotating shaft; 2. Second rotating shaft; 23. Small gear; 24. Second shaft; 25. Rotating arm; 26. Top cavity; 27. Clamping cylinder; 28. Clamping piston rod; 29. ​​Middle sliding groove; 30. Bottom sliding groove; 31. Connecting lug; 32. First sliding groove; 33. First shaft; 34. Connecting seat; 35. Second sliding groove; 36. Receiving groove; 37. Arc-shaped groove; 38. Connecting arm; 39. Side groove; 40. Long bolt; 41. Reserved hole; 42. Reserved groove. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example: Please see Figures 1-13 The present invention provides a technical solution: A cold heading forming equipment for explosion-proof high-pressure oil pipe joints includes a base 1, a stand 2 and a bottom clamping assembly near the bottom of the stand 2 are fixed on the upper end of the base 1, and a top clamping assembly is slidably connected on the stand 2. The bottom clamping assembly includes a bottom receiving seat 7 fixed to the upper end of the base 1 by long bolts 40, and a bottom semi-circular clamp 10 disposed in the center of the upper end of the bottom receiving seat 7. The top clamping assembly includes a top semi-circular clamping seat 8 and a lifting connecting frame 9 provided on the upper end of the top semi-circular clamping seat 8. The lifting connecting frame 9 is slidably connected to the inside of the stand 2, and the clamping piston rod 28 at the output end of the clamping cylinder 27 is fixed to the lifting connecting frame 9.

[0022] The bottom receiving seat 7 is also provided with a limiting post 19 at the upper end, and the top semi-circular clamp 8 is provided with a limiting seat 20 on the side, with the limiting post 19 extending through the corresponding limiting seat 20.

[0023] The clamping cylinder 27 on the stand 2 pushes the top clamping assembly down, so that the top clamping assembly matches the bottom clamping assembly and is used to clamp the joint pipe material. The bottom clamping assembly has a lifting and ejecting assembly inside, which is connected to the top clamping assembly. The lifting and ejection assembly includes a lifting column 18 disposed in a reserved hole 41 on the bottom semi-circular clamp 10 and a connecting seat 34 connected to the bottom of the lifting column 18 by a connecting arm 38; The top of the lifting column 18 is provided with an arc-shaped groove 37; The bottom of the lifting connecting frame 9 is provided with two sets of connecting ears 31, and the upper part of the connecting seat 34 is provided with a first shaft 33, which slides into the first sliding groove 32 on the connecting ears 31. The bottom of the bottom receiving seat 7 is provided with a receiving groove 36, the bottom of the reserved hole 41 communicates with the receiving groove 36, and the connecting arm 38 is located in the receiving groove 36; The connecting arm 38 has a second shaft 24 on its side. The second shaft 24 extends through the side groove 39 at the end of the bottom receiving seat 7 and slides into the second sliding groove 35 on the rotating arm 25.

[0024] When the top clamping assembly is connected and moved upward to reset, the top clamping assembly drives the lifting and pushing assembly to move upward and push out the cold-forged joint tube raw material; The bottom clamping assembly is provided with a blocking and limiting assembly at its end, which is connected to the bottom side of the lifting and ejecting assembly; The sealing and limiting assembly includes a small gear 23 rotatably connected to the end of the bottom semi-circular clamp 10 by a first rotating shaft 21, a sealing plate 16 fixed to the side of the small gear 23, a large gear 17 rotatably connected to the end of the bottom receiving seat 7 by a second rotating shaft 22, and a rotating arm 25 fixed to the side of the large gear 17. The small gear 23 and the large gear 17 mesh with each other.

[0025] When the top clamping assembly moves downward to match the bottom clamping assembly, the top clamping assembly drives the sealing and limiting assembly to rotate through the lifting and pushing assembly to achieve the sealing of the end of the joint pipe material. The inside of the stand 2 is provided with a top cavity 26, a middle slide groove 29 and a bottom slide groove 30 from top to bottom. The clamping cylinder 27 is located in the top cavity 26 and is fixed to the top of the middle slide groove 29. The lifting connecting frame 9 slides into the middle slide groove 29, and the side of the stand 2 is also provided with an end cap 11 for covering the top cavity 26 and the middle slide groove 29. The lifting connecting frame 9 extends out through the reserved groove 42 on the end cap 11. The connecting arm 38 slides into the bottom groove 30.

[0026] The upper end of the base 1 is also slidably connected to a cold heading pressing component, which is used to cold heading and pressing the front end of the joint pipe material.

[0027] The cold heading pressing assembly includes a cold heading pressing moving base 5, an equipment box 6 fixed at the upper end of the cold heading pressing moving base 5, a cold heading cylinder 15 installed inside the equipment box 6, and a cold heading pressing head 12 connected to the output end of the cold heading cylinder 15 after it extends through the equipment box 6.

[0028] The upper end of the base 1 is provided with two sets of parallel guide rails 3 and a rack 4 located between the two sets of guide rails 3. The cold heading pressing moving seat 5 is slidably connected to the two sets of guide rails 3. A servo motor 13 is also installed in the bottom of the cold heading pressing moving seat 5. The drive gear 14 at the output end of the servo motor 13 meshes with the rack 4.

[0029] This invention also provides a forming method for a cold heading forming device for explosion-proof high-pressure oil pipe joints, specifically including the following steps: S1. Place the connector tube material on the bottom clamping assembly, and the clamping cylinder 27 pushes the top clamping assembly down until the top clamping assembly and the bottom clamping assembly cooperate to clamp and fix the connector tube material. S2. As the top clamping assembly moves down, the lifting and pushing assembly drives the sealing and limiting assembly to rotate, thereby sealing the end of the joint pipe material. S3. The front end of the joint pipe material is cold-forged and formed using a cold-forging pressing assembly. S4. When the top clamping assembly moves up and resets, the top clamping assembly drives the lifting and pushing assembly to move up and push out the cold-forged joint tube raw material. At the same time, the sealing and limiting assembly rotates and resets.

[0030] Specifically, when using it: The core design concept of this equipment is to simultaneously drive the three major functions of "clamping and fixing", "end sealing" and "finished product ejection" through the lifting and lowering action of the top clamping component, thereby realizing an efficient, compact and automated cold heading forming cycle.

[0031] The entire equipment's working cycle can be divided into the clamping-sealing stage, the cold heading stage, and the demolding and resetting stage. Its power source is mainly the clamping cylinder 27 and the cold heading cylinder 15.

[0032] I. Initial State and Raw Material Placement: The top clamping assembly is in a high position, the lifting and ejecting assembly is in a high position, and the sealing and limiting assembly is in an open state (the end is not sealed). The operator places the joint pipe raw material (tubular blank) to be processed horizontally on the bottom clamping assembly. Since the lifting column 18 of the lifting and ejecting assembly extends through the reserved hole 41 at this time, the joint pipe raw material is placed in the arc-shaped groove 37 on the top of several sets of lifting columns 18. II. Clamping and Sealing Stage: This stage is driven by clamping cylinder 27, which simultaneously completes the fixing of raw materials and end sealing.

[0033] The top clamping assembly moves down (clamping action): When the clamping cylinder 27 is activated, its clamping piston rod 28 extends downward, pushing the lifting connecting frame 9 to slide downward along the central slide groove 29 inside the stand 2.

[0034] The lifting connecting frame 9 moves the top semi-circular clamp 8 downward until it is fully aligned with the fixed bottom semi-circular clamp 10. At this point, the connector tube material is clamped in the complete circular hole formed by the two, completing radial positioning and clamping.

[0035] To ensure guiding accuracy, the limit post 19 passes through the limit seat 20 simultaneously, ensuring precise mold closing between the upper and lower clamps.

[0036] Linkage-driven blocking and limit components (blocking action): As the lifting connecting frame 9 moves down, the two sets of connecting ears 31 at its bottom are slidably connected to the first shaft 33 through the first sliding groove 32. The lifting and pushing assembly moves down to the upper surface of the base 1 under its own gravity, and the connecting seat 34 moves down through the connecting arm 38 (the connecting arm 38 is guided along the bottom sliding groove 30 of the stand 2). Until the arc-shaped groove 37 at the top of the lifting column 18 is flush with the upper inner wall of the bottom semi-circular clamp 10, the first shaft 33 slides to the top of the first sliding groove. The second shaft 24 on the side of the connecting arm 38 passes through the side groove 39 at the end of the bottom receiving seat 7 and slides into the second sliding groove 35 on the rotating arm 25. Since the rotating arm 25 and the large gear 17 are coaxially fixed to the second rotating shaft 22, the downward movement of the second shaft 24 will force the rotating arm 25 to swing downward, thereby driving the large gear 17 to rotate around the second rotating shaft 22.

[0037] The large gear 17 and the small gear 23 mesh with each other (the small gear 23 is mounted on the end of the bottom semi-circular clamp 10 via the first rotating shaft 21). The rotation of the large gear 17 drives the small gear 23 to rotate in the opposite direction, which in turn causes the sealing plate 16 fixed on the side of the small gear 23 to flip upward, which just blocks the end port of the joint tube material, providing axial reaction force support for subsequent cold heading.

[0038] III. Cold heading stage: At this point, the equipment is in a "clamping + sealing" state, and the cold heading pressing component begins to work.

[0039] Feed positioning: The servo motor (13) starts, and the drive gear (14) at its output end meshes with the rack (4) on the base, driving the entire cold heading pressing moving seat (5) to move forward precisely along the two sets of guide rails (3), so that the cold heading pressing head (12) is aligned with the front end of the joint tube raw material to be processed.

[0040] Cold heading: The cold heading cylinder (15) inside the equipment box (6) pushes the cold heading pressing head (12) connected to its output end to press forward at high speed, extruding the front end of the joint pipe material and causing it to undergo plastic flow in the closed mold cavity (formed by the top semi-circular clamp 8 and the bottom semi-circular clamp 10), cold heading out the required explosion-proof joint shape (such as hexagonal head, flange or sealing cone).

[0041] IV. Demolding and Resetting Stage: After cold heading is completed, all actions are reversed, but at this time the upward movement of the lifting and ejection component has a new function of "ejecting the finished product".

[0042] The top clamping assembly moves upward (releases and moves): The clamping cylinder 27 drives the clamping piston rod 28 to retract, which in turn moves the lifting connecting frame 9 and the top semi-circular clamping seat 8 upward, releasing the formed joint pipe material.

[0043] Linkage-driven lifting and ejection component (ejection action): When the lifting connecting frame 9 moves upward, it pulls the connecting seat 34 and the connecting arm 38 upward synchronously through the connecting ear 31 and the first sliding groove 32.

[0044] The upper end of the connecting arm 38 is directly fixed to the bottom of the lifting column 18. The lifting column 18 was originally located in the reserved hole 41 of the bottom semi-circular clamp 10.

[0045] When the connecting arm 38 moves upward, the lifting column 18 pushes upward along the reserved hole 41, and the arc-shaped groove 37 at its top directly contacts the bottom of the formed joint, forcibly pushing it out from the concave surface of the bottom semi-circular clamp 10, thus completing the automatic demolding.

[0046] Linkage drive barrier limit component reset (opening action): At the same time, the connecting arm 38 moves upward, causing the second shaft 24 to slide upward along the second sliding groove 35, driving the rotating arm 25 to swing in the opposite direction (upward), driving the large gear 17 to reverse, and then meshing to drive the small gear 23 to reverse, causing the sealing plate 16 to flip downward and reset, opening the end channel, making it easier to remove the finished product or blow away the waste.

[0047] The above is the complete working logic of this invention. Its core innovation lies in utilizing the single reciprocating motion of the clamping cylinder 27 to achieve the timing control of "automatic sealing when clamping" and "automatic ejection when releasing" through mechanical linkage (slide groove-shaft-gear), without the need for additional sensors or independent actuators, which significantly improves the automation efficiency and reliability of cold heading forming.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cold heading forming equipment for explosion-proof high-pressure oil pipe joints, comprising a base (1), characterized in that: The upper end of the base (1) is fixed with a stand (2) and a bottom clamping assembly near the bottom of the stand (2). A top clamping assembly is slidably connected on the stand (2). The clamping cylinder (27) on the stand (2) pushes the top clamping assembly down so that the top clamping assembly matches the bottom clamping assembly and is used to clamp the joint pipe material. The bottom clamping assembly is equipped with a lifting and pushing assembly inside. The lifting and pushing assembly is connected to the top clamping assembly. When the top clamping assembly is moved upward and reset, the top clamping assembly drives the lifting and pushing assembly to move upward and push out the cold-forged joint tube raw material. The bottom clamping assembly is provided with a sealing and limiting assembly at its end. The sealing and limiting assembly is connected to the bottom side of the lifting and pushing assembly. When the top clamping assembly moves downward to match the bottom clamping assembly, the top clamping assembly drives the sealing and limiting assembly to rotate through the lifting and pushing assembly to seal the end of the joint pipe material. The upper end of the base (1) is also movably slidably connected to a cold heading pressing component, which is used to cold heading and pressing the front end of the joint pipe material.

2. The cold heading forming equipment for explosion-proof high-pressure oil pipe joints according to claim 1, characterized in that: The cold heading pressing assembly includes a cold heading pressing moving base (5), an equipment box (6) fixed at the upper end of the cold heading pressing moving base (5), a cold heading cylinder (15) installed inside the equipment box (6), and a cold heading pressing head (12) connected after the output end of the cold heading cylinder (15) extends through the equipment box (6).

3. The cold heading forming equipment for explosion-proof high-pressure oil pipe joints according to claim 2, characterized in that: The upper end of the base (1) is provided with two sets of parallel guide rails (3) and a rack (4) located between the two sets of guide rails (3). The cold heading pressing moving seat (5) slides on the two sets of guide rails (3). A servo motor (13) is also installed in the bottom of the cold heading pressing moving seat (5). The drive gear (14) at the output end of the servo motor (13) meshes with the rack (4).

4. The cold heading forming equipment for explosion-proof high-pressure oil pipe joints according to claim 1, characterized in that: The bottom clamping assembly includes a bottom receiving seat (7) fixed to the upper end of the base (1) by a long bolt (40) and a bottom semi-circular clamp (10) set in the center of the upper end of the bottom receiving seat (7). The top clamping assembly includes a top semi-circular clamp (8) and a lifting connecting frame (9) provided on the upper end of the top semi-circular clamp (8). The lifting connecting frame (9) is slidably connected to the inside of the stand (2), and the clamping piston rod (28) at the output end of the clamping cylinder (27) is fixed to the lifting connecting frame (9).

5. The cold heading forming equipment for an explosion-proof high-pressure oil pipe joint according to claim 4, characterized in that: The bottom receiving seat (7) is also provided with a limiting post (19) at the upper end, and the top semi-circular clamp (8) is provided with a limiting seat (20) on the side. The limiting post (19) extends through the corresponding limiting seat (20).

6. The cold heading forming equipment for an explosion-proof high-pressure oil pipe joint according to claim 4, characterized in that: The sealing and limiting assembly includes a small gear (23) rotatably connected to the end of the bottom semi-circular clamp (10) by a first rotating shaft (21), a sealing plate (16) fixed to the side of the small gear (23), a large gear (17) rotatably connected to the end of the bottom receiving seat (7) by a second rotating shaft (22), and a rotating arm (25) fixed to the side of the large gear (17). The small gear (23) and the large gear (17) mesh with each other.

7. The cold heading forming equipment for explosion-proof high-pressure oil pipe joints according to claim 6, characterized in that: The lifting and ejection assembly includes a lifting column (18) installed in a reserved hole (41) on the bottom semi-circular clamp (10) and a connecting seat (34) connected to the bottom of the lifting column (18) by a connecting arm (38). The top of the lifting column (18) is provided with an arc-shaped groove (37); The lifting connecting frame (9) has two sets of connecting ears (31) at the bottom, and the connecting seat (34) has a first shaft (33) at the top. The first shaft (33) slides into the first sliding groove (32) on the connecting ear (31). The bottom of the bottom receiving seat (7) is provided with a receiving groove (36), the bottom of the reserved hole (41) is connected to the receiving groove (36), and the connecting arm (38) is located in the receiving groove (36); The connecting arm (38) is provided with a second shaft (24) on its side. The second shaft (24) extends through the side groove (39) at the end of the bottom receiving seat (7) and slides into the second sliding groove (35) on the rotating arm (25).

8. The cold heading forming equipment for explosion-proof high-pressure oil pipe joints according to claim 7, characterized in that: The stand (2) is provided with a top cavity (26), a middle slide groove (29) and a bottom slide groove (30) from top to bottom. The clamping cylinder (27) is located in the top cavity (26) and is fixed to the top of the middle slide groove (29). The lifting connecting frame (9) slides into the middle slide groove (29), and the side of the stand (2) is also provided with an end cap (11) for covering the top cavity (26) and the middle slide groove (29). The lifting connecting frame (9) extends through the reserved groove (42) on the end cap (11). The connecting arm (38) slides into the bottom groove (30).

9. A forming method for a cold heading forming apparatus for an explosion-proof high-pressure oil pipe joint according to any one of claims 1-8, characterized in that: Specifically, the following steps are included: S1. Place the connector tube material on the bottom clamping assembly, and the clamping cylinder (27) pushes the top clamping assembly down until the top clamping assembly and the bottom clamping assembly cooperate to clamp and fix the connector tube material. S2. As the top clamping assembly moves down, the lifting and pushing assembly drives the sealing and limiting assembly to rotate, thereby sealing the end of the joint pipe material. S3. The front end of the joint pipe material is cold-forged and formed using a cold-forging pressing assembly. S4. When the top clamping assembly moves up and resets, the top clamping assembly drives the lifting and pushing assembly to move up and push out the cold-forged joint tube raw material. At the same time, the sealing and limiting assembly rotates and resets.

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