Mechanical device for forming large-diameter y-shaped reducing tee by cold extrusion

Abstract

The application discloses a super-large-caliber Y-shaped reducing tee reducing forming mechanical device based on cold extrusion and relates to the field of tee cold pressure forming. The following scheme is provided, which comprises a mold and an opening and closing mold mechanism for driving the opening and closing of the mold, both sides of the mold are respectively provided with a water injection forming mechanism and a reducing forming mechanism, the water injection forming mechanism comprises a first plugging head, an auxiliary forming assembly for assisting impact forming is assembled in the first plugging head, the reducing forming mechanism comprises a second plugging head, the second plugging head is composed of a plugging pipe and a water guide seat, and a pressure edge assembly for assisting reducing forming is assembled in the plugging pipe. Through the auxiliary forming assembly, the tee forming of the two-way pipe blank is assisted, the forming efficiency is improved, water can be supplied back to the end of the two-way pipe blank for reducing forming, water is saved, and then the tee forming and the pipeline reducing are completed at the same time, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of cold pressing forming of tees, and more particularly to a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Background Technology

[0002] There are generally two processing methods for metal tees: welding and cold extrusion. In the field of cold extrusion manufacturing of tees or branch pipes, when the internal diameter of the pipe is ≥720mm, the pipe is defined as a large-diameter pipe, and when the internal diameter of the pipe is ≥1720mm, the pipe is defined as an ultra-large-diameter pipe. When cold extruding ultra-large pipes, water pressure is used for forming, which requires a large amount of water resources. Chinese patent CN115647169B discloses a pressure regulating device and method for hydraulically forming branch pipes of large-diameter ultra-long pipelines, which relates to the field of cold extrusion of large-diameter ultra-long pipelines. The device includes an upper positioning support device, a lower positioning support device, a hydraulic thrust amplification device, an upper die, a lower die, a left horizontal cylinder plug, a right horizontal cylinder plug, a pipe blank, a liquid injection and unloading device, a hydraulic monitoring mechanism, and a pneumatic pressure monitoring mechanism. Firstly, it uses a hydraulic thrust amplification device to assist in molding and reduce water consumption. However, the liquid pressure on the hydraulic bearing surface 13-2 is nine times that on the top column 13-1, and this pressure increases with the increase of liquid pressure, thus amplifying the pressure. But in essence, it still uses water pressure to push the top column to squeeze the pipe, causing the pipe to deform at the squeeze point. Since the water pressure on the top column is constant, what changes is the side of the pipe that is in contact with the top column 13-1. Because the cross-sectional area of ​​the side of the pipe that is in contact with the top column 13-1 is small, the pressure on the pipe is concentrated, the pressure increases, and the pressure is continuous. This causes the force on the pipe to be concentrated in the center, and the pressure on the periphery is not equal to that in the center, which can easily cause the pipe to be ruptured, leading to molding failure. Secondly, in extra-large diameter Y-type tees, it is often necessary to process reducing tees. For the branch pipes formed later, the diameter can be reduced by the mold. However, the diameter reduction at both ends of the semi-finished pipe cannot be completed by the water used to form the tee at the same time. Summary of the Invention

[0003] (a) Purpose of the invention In view of this, the purpose of this invention is to propose a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion, so as to realize the pipe diameter change while forming the tee, thereby improving production efficiency and reducing production costs.

[0004] (II) Technical Solution To achieve the above-mentioned technical objectives, the present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tee based on cold extrusion: It includes a mold and a mold opening and closing mechanism for driving the mold to open and close. The mold has a water injection forming mechanism and a diameter changing forming mechanism on both sides. The water injection forming mechanism includes a first sealing head, which is equipped with an auxiliary forming component for assisting impact forming. The diameter changing forming mechanism includes a second sealing head, which is composed of a plug pipe and a water guide seat. The plug pipe is equipped with a pressing component for assisting diameter changing forming. The water guide seat has a third water guide groove, which is used to discharge the high-pressure water generated when driving the auxiliary forming component, and the third water guide groove guides the high-pressure water into the plug pipe for secondary diameter changing forming.

[0005] Preferably, the mold opening and closing mechanism consists of a base, a guide rod, a top beam, a first hydraulic cylinder, and a connecting beam. The guide rod is fixed to the upper surface of the base, the top beam is fixed to the top of the guide rod, the first hydraulic cylinder is fixed to the top beam, the connecting beam is fixedly connected to the output end of the first hydraulic cylinder, and the side of the connecting beam is slidably connected to the guide rod.

[0006] Preferably, the mold consists of an upper mold and a lower mold. The lower mold is fixed on the base, and the upper mold is fixed on the bottom of the connecting beam. After the upper mold and the lower mold are closed, the internal cavities at both ends of the upper mold match the shapes of the first sealing head and the second sealing head, respectively.

[0007] Preferably, the upper surface of the base is provided with a first support seat, a second support seat and a connecting seat, the first support seat and the second support seat are fixedly connected to the base, and the connecting seat is slidably connected to the base.

[0008] Preferably, the water injection molding mechanism further includes a second oil cylinder and a third oil cylinder, both of which are fixed on the first support base, and the output end of the second oil cylinder is fixed with a first extrusion rod.

[0009] Preferably, the first sealing head includes a water injection pipe, a water guide pipe, and an inner mold head connected in sequence. The water injection pipe is fixed on the connecting seat. The output end of the third oil cylinder is fixedly connected to the end of the water injection pipe. The first extrusion rod fits into the inner cavity of the water injection pipe and is slidably connected to the water injection pipe. The water injection pipe has a two-way water delivery groove inside. The water guide pipe has a three-way water delivery groove inside. The two-way water delivery groove and the three-way water delivery groove are connected. A blocking block is fixed inside the water guide pipe.

[0010] Preferably, the auxiliary molding assembly comprises a hydraulic drive component, an impact component, and an impact component. The hydraulic drive component consists of a water wheel, a connecting rod, a drive shaft, and a connecting block. The water wheel is rotatably connected to the water guide pipe, and the connecting rod is eccentrically rotatably connected to the side of the water wheel. One end of the drive shaft is hinged to the connecting rod, and the other end of the drive shaft is slidably connected to the water guide pipe. The connecting block is fixed to the end of the drive shaft. The impact component consists of a cylinder, a drive piston, and an impact piston. The cylinder is fixed inside the water guide pipe, and the drive piston and the impact piston are slidably connected to the two ends of the cylinder, respectively. A medium is provided between the drive piston and the impact piston, but the medium does not fill the inside of the cylinder. The bottom of the drive piston is fixedly connected to the connecting block. The impact component consists of an impact head and a first spring. The impact head is slidably connected to the water guide pipe, and the first spring is sleeved on the impact head.

[0011] Preferably, the water guide pipe has a first installation chamber, a second installation chamber, and a third installation chamber for installing a hydraulic drive component, an impact component, and a collision component. The second installation chamber is connected to the third installation chamber. The outer surface of the water guide pipe is fixed with a first sealing plate and a second sealing plate for sealing the second and third installation chambers, respectively. The impact head is slidably connected to the second sealing plate. The first installation chamber forms a closed space with the water wheel through a plug. The water wheel has a first water guide groove and a second water guide groove on both sides. The inner cavities at both ends of the water guide pipe are connected sequentially through the first water guide groove, the first installation chamber, and the second water guide groove.

[0012] Preferably, the variable diameter forming mechanism further includes a second extrusion rod, a fourth hydraulic cylinder, and a fifth hydraulic cylinder. The fourth and fifth hydraulic cylinders are both fixed on the second support base. The output end of the fifth hydraulic cylinder is fixedly connected to the water guide base. One end of the second extrusion rod is fixedly connected to the output end of the fourth hydraulic cylinder, and the other end of the second extrusion rod is telescopically connected to the water guide base.

[0013] Preferably, the pressing assembly consists of a pressing block and an extrusion driving component. A limiting groove is formed inside the plug tube. Both sides of the pressing block are rotatably connected to the inner wall of the limiting groove. The extrusion driving component consists of a spiral groove, a spiral rod, and a second spring. The spiral groove is formed inside the plug tube and communicates with the limiting groove. The spiral rod is spirally connected to the spiral groove. The second spring is sleeved on the spiral rod. The two ends of the second spring abut against the inner wall of the spiral rod and the spiral groove, respectively. The abutting surface between the spiral rod and the pressing block is wedge-shaped, and the abutting surface between the pressing block and the spiral rod is conical.

[0014] As can be seen from the above technical solutions, this application has the following beneficial effects: 1. By installing an auxiliary diameter-changing forming pressing component inside the plug, during the positioning of the second plug head, the spiral rod can squeeze the pressing block to press the edge of the two-way pipe blank. After the second plug head is in place, the spiral rod rotates to the bottom of the pressing block, allowing the pressing block to reset. Water in the water guide seat can enter the plug through the third water guide groove, allowing the two-way pipe blank to change diameter and form.

[0015] Second, by installing an auxiliary forming component inside the water guide pipe, water can drive the impact component to repeatedly impact the impact head through the hydraulic drive component. The impact head repeatedly impacts the pipe wall of the two-way pipe blank, causing metal fatigue of the pipe wall, reducing the water pressure required for forming, assisting the two-way pipe blank in forming a three-way, improving forming efficiency, and water can be returned to supply the end diameter change forming of the two-way pipe blank, saving water. Thus, the pipe diameter change is completed at the same time as forming the three-way, improving production efficiency and reducing production costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall structure of the ultra-large diameter Y-type variable diameter tee forming mechanical device based on cold extrusion provided by the present invention; Figure 2 The present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Figure 1 A schematic diagram of the exploded structure; Figure 3 The present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Figure 2 A schematic diagram of the vertical cross-section of the water injection molding mechanism; Figure 4 The present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Figure 2 Schematic diagram of the cross-sectional structure of the central water guide pipe; Figure 5 The present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Figure 3 A cross-sectional schematic diagram of the central water guide pipe and auxiliary molding components; Figure 6 The present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Figure 5 A schematic diagram of the overall structure of the auxiliary molding component; Figure 7The present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Figure 2 Cross-sectional structural diagram of the variable diameter forming mechanism; Figure 8 The present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Figure 7 A partial structural diagram of the plug and extrusion drive components; Figure 9 The present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Figure 8 A schematic diagram of the protruding state of the central helical rod; Figure 10 The present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Figure 8 A schematic diagram of the screw rod in its engaged state; Figure 11 The present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Figure 8 A schematic diagram of the structure during the insertion process of the central screw; Figure 12 The present invention provides a mechanical device for forming ultra-large diameter Y-type variable diameter tees based on cold extrusion. Figure 2 A schematic diagram of the overall structure of the two-way pipe blank after molding.

[0018] Figure Descriptions: 1. Base; 11. First Support; 12. Second Support; 13. Connecting Seat; 2. Guide Rod; 3. Top Beam; 4. First Hydraulic Cylinder; 5. Connecting Beam; 6. Mold; 61. Upper Mold; 62. Lower Mold; 7. Water Injection Molding Mechanism; 71. Water Injection Pipe; 711. Two-Way Water Delivery Channel; 72. Water Guide Pipe; 721. First Sealing Plate; 722. Three-Way Water Delivery Channel; 723. Block; 724. Second Sealing Plate; 725. First Water Guide Channel; 726. Second Water Guide Channel; 73. Inner Mold Head; 74. Auxiliary Molding Components; 741. Hydraulic Drive Components; 7411. Water Wheel; 7412. Connecting Rod; 7413. Drive Shaft; 7 414. Connecting block; 742. Impact component; 7421. Cylinder; 7422. Transmission piston; 7423. Impact piston; 743. Impact component; 7431. Impact head; 7432. First spring; 75. First extrusion rod; 76. Second hydraulic cylinder; 77. Third hydraulic cylinder; 8. Variable diameter forming mechanism; 81. Pipe plug; 811. Limiting groove; 812. Pressing block; 813. Extrusion drive component; 8131. Spiral groove; 8132. Spiral rod; 8133. Second spring; 82. Water guide seat; 821. Third water guide groove; 83. Second extrusion rod; 84. Fourth hydraulic cylinder; 85. Fifth hydraulic cylinder; 9. Two-way pipe blank. Detailed Implementation

[0019] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0020] Reference Figure 1-12 : The cold extrusion-based ultra-large diameter Y-type variable diameter tee forming machine includes a mold 6 and a mold opening and closing mechanism for driving the mold 6 to open and close. The mold 6 consists of an upper mold 61 and a lower mold 62. The mold opening and closing mechanism consists of a base 1, a guide rod 2, a top beam 3, a first hydraulic cylinder 4, and a connecting beam 5. The guide rod 2 is fixed to the upper surface of the base 1, the top beam 3 is fixed to the top of the guide rod 2, the first hydraulic cylinder 4 is fixed to the top beam 3, and the connecting beam 5 is fixedly connected to the output end of the first hydraulic cylinder 4. The side of the connecting beam 5 is slidably connected to the guide rod 2 to improve the stability of the connecting beam 5's up and down movement. The lower mold 62 is fixed to the base 1, and the upper mold 61 is fixed to the bottom of the connecting beam 5. The upper mold 61 is driven up and down by the first hydraulic cylinder 4 to realize the mold opening and closing.

[0021] like Figure 1 and Figure 2 As shown, the upper surface of the base 1 is provided with a first support seat 11, a second support seat 12 and a connecting seat 13. The first support seat 11 and the second support seat 12 are both fixedly connected to the base 1, and the connecting seat 13 is slidably connected to the base 1. The first support seat 11 and the second support seat 12 are respectively equipped with a water injection molding mechanism 7 and a variable diameter molding mechanism 8. The water injection molding mechanism 7 includes a first sealing head, and the variable diameter molding mechanism 8 includes a second sealing head. After the upper mold 61 and the lower mold 62 are closed, the internal cavities at both ends of the mold 61 and the lower mold 62 respectively match the outer shapes of the first sealing head and the second sealing head. See Figure 2 and Figure 3As shown, specifically, the water injection molding mechanism 7 also includes a second hydraulic cylinder 76 and a third hydraulic cylinder 77. Both the second hydraulic cylinder 76 and the third hydraulic cylinder 77 are fixed on the first support base 11. The output end of the second hydraulic cylinder 76 is fixed with a first extrusion rod 75. The first sealing head includes a water injection pipe 71, a water guide pipe 72, and an inner mold head 73 connected in sequence. The water injection pipe 71 is passed through the middle and is fixed on the connecting base 13. The output end of the third hydraulic cylinder 77 is fixedly connected to the end of the water injection pipe 71. The third hydraulic cylinder 77 drives the water injection pipe 71 to translate, and the first extrusion rod 75 matches the inner cavity of the water injection pipe 71 and interacts with the water injection... The pipe 71 is slidably connected. When the first extrusion rod 75 extrudes into the water injection pipe 71, it can pressurize the water in the water injection pipe 71. The first extrusion rod 75 and the water injection pipe 71 are conventionally sealed. The water injection pipe 71 has a two-way water delivery groove 711 inside. The water guide pipe 72 has a three-way water delivery groove 722 inside. The two-way water delivery groove 711 and the three-way water delivery groove 722 are connected. External water can be sent into the water guide pipe 72 through the two-way water delivery groove 711 and the three-way water delivery groove 722. The water guide pipe 72 has a fixed block 723 inside. The outlet of the three-way water delivery groove 722 is located on the left side of the block 723. See Figure 3 , Figure 5 and Figure 6 As shown, more specifically, the water guide pipe 72 is equipped with an auxiliary forming component 74 for assisting impact forming. The auxiliary forming component 74 consists of a hydraulic drive component 741, an impact component 742, and an impact component 743. The hydraulic drive component 741 consists of a water wheel 7411, a connecting rod 7412, a drive shaft 7413, and a connecting block 7414. The water wheel 7411 is rotatably connected to the water guide pipe 72, and the connecting rod 7412 is eccentrically rotatably connected to the side of the water wheel 7411. One end of the drive shaft 7413 is hinged to the connecting rod 7412, and the other end of the drive shaft 7413 can extend and retract inside the water guide pipe 72. The connecting block 7414 is fixed to the end of the drive shaft 7413. When the water wheel 7411 rotates, the eccentric movement of the water wheel 7411 drives the drive shaft 7413 to move up and down. See Figure 5 and Figure 6 As shown, the impact component 742 consists of a cylinder 7421, a transmission piston 7422, and an impact piston 7423. The cylinder 7421 is fixed inside the water guide pipe 72. The transmission piston 7422 and the impact piston 7423 are slidably connected to both ends of the cylinder 7421, respectively. A medium is provided between the transmission piston 7422 and the impact piston 7423. The bottom of the transmission piston 7422 is fixedly connected to the connecting block 7414. The up-and-down movement of the transmission shaft 7413 can drive the transmission piston 7422 to impact the medium, causing the medium to impact the impact piston 7423. It is worth mentioning that the medium does not completely fill the inside of the cylinder 7421. (Refer to the attached diagram.) Figure 5 This allows the impact piston 7423 to move up and down, and the medium can be water, which can be compressed. See Figure 5 and Figure 6 As shown, the impact component 743 consists of an impact head 7431 and a first spring 7432. The impact head 7431 is slidably connected to the water guide pipe 72. The first spring 7432 is sleeved on the impact head 7431 and is used to provide elastic force to the impact head 7431 for reset. By impacting the impact head 7431 with the impact piston 7423, the impact head 7431 can impact the pipe wall of the two-way pipe blank 9. Since the medium is present and can be compressed, the impact process of the impact head 7431 can be changed with the deformation of the pipe wall of the two-way pipe blank 9 to ensure the impact effect.

[0022] Furthermore, such as Figure 5 As shown, in order to ensure the direction of water flow and make full use of hydraulic power, a first installation chamber, a second installation chamber, and a third installation chamber are provided inside the water guide pipe 72 for mounting the hydraulic drive component 741, the impact component 742, and the collision component 743. The second installation chamber is connected to the third installation chamber. A first sealing plate 721 and a second sealing plate 724 are respectively fixed on the outer surface of the water guide pipe 72 to seal the second and third installation chambers, ensuring the airtightness of the second and third installation chambers, and the impact head... 7431 is slidably connected to the second sealing plate 724, allowing the impact head 7431 to move up and down. The first installation chamber forms a closed space with the water wheel 7411 through the plug 723. The water wheel 7411 has a first water guide groove 725 and a second water guide groove 726 on both sides respectively. The inner cavities at both ends of the water guide pipe 72 are connected in sequence through the first water guide groove 725, the first installation chamber and the second water guide groove 726. In this way, the water flow must pass through the water wheel 7411 before entering the right side of the water guide pipe 72, allowing the water wheel 7411 to make full use of the water power.

[0023] like Figure 7 As shown, the second sealing head is composed of a plug pipe 81 and a water guide seat 82. The plug pipe 81 is equipped with a pressing component for auxiliary diameter changing forming. The water guide seat 82 is provided with a third water guide groove 821. The third water guide groove 821 is used to discharge the high-pressure water generated when driving the auxiliary forming component 74, and the third water guide groove 821 guides the high-pressure water into the plug pipe 81 for secondary diameter changing forming. Specifically, such as Figure 2 As shown, the variable diameter forming mechanism 8 also includes a second extrusion rod 83, a fourth hydraulic cylinder 84, and a fifth hydraulic cylinder 85. The fourth hydraulic cylinder 84 and the fifth hydraulic cylinder 85 are both fixed on the second support base 12. The output end of the fifth hydraulic cylinder 85 is fixedly connected to the water guide seat 82. One end of the second extrusion rod 83 is fixedly connected to the output end of the fourth hydraulic cylinder 84, and the other end of the second extrusion rod 83 is telescopically connected to the water guide seat 82. The second extrusion rod 83 and the water guide seat 82 are conventionally sealed. By inserting the second extrusion rod 83 into the water guide seat 82, the water inside the water guide seat 82 can be pressurized. More specifically, such as Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, the pressing assembly consists of a pressing block 812 and an extrusion driving component 813. A limiting groove 811 is formed inside the plug tube 81. Both sides of the pressing block 812 are rotatably connected to the inner wall of the limiting groove 811. The extrusion driving component 813 consists of a spiral groove 8131, a spiral rod 8132, and a second spring 8133. The spiral groove 8131 is formed inside the plug tube 81 and communicates with the limiting groove 811. The spiral rod 8132 is spirally connected to the spiral groove 8131, so that when the spiral rod 8132 enters the spiral groove 8131, it can also rotate synchronously. The second spring 8133 is sleeved on the spiral rod 8132. Both ends of the second spring 8133 abut against the inner walls of the spiral rod 8132 and the spiral groove 8131, respectively. The second spring 8133 allows the spiral rod 8132 to return to its original position. The contact surface between the spiral rod 8132 and the pressure block 812 is wedge-shaped, and the contact surface between the pressure block 812 and the spiral rod 8132 is conical. When the spiral rod 8132 presses against the pressure block 812, the pressure block 812 rotates into the plug 81. Since the spiral rod 8132 rotates while pressing, when the spiral rod 8132 rotates to below the pressure block 812, that is... Figure 10 When in the indicated state, the pressure block 812 can be reset, without affecting the water flow's pressure on the two-way pipe blank 9.

[0024] Working principle: During use, the external oil pump and water pump provide the working power for this cold extrusion-based ultra-large diameter Y-type variable diameter tee forming machine. Next, the two-way pipe blank 9 is placed between the upper mold 61 and the lower mold 62. Then, the first oil cylinder 4 drives the connecting beam 5 to press down, bringing the upper mold 61 and the lower mold 62 together. Then, the third oil cylinder 77 and the fifth oil cylinder 85 work to drive the first sealing head and the second sealing head to be inserted into the upper mold 61 and the lower mold 62 respectively to seal both ends of the two-way pipe blank 9. An external water pump operates, delivering water through a two-way water delivery channel 711 and a three-way water delivery channel 722 into the water guide pipe 72 and the two-way pipe blank 9, respectively. Part of the water fills the space between the two-way pipe blank 9 and the water guide pipe 72, squeezing the pipe wall of the two-way pipe blank 9. Part of the water passes through the first water guide channel 725 and impacts the water wheel 7411, causing the water wheel 7411 to rotate. The water wheel 7411 then drives the transmission shaft 7413 to repeatedly rise and fall via the connecting rod 7412. The transmission shaft 7413 drives the transmission piston 7422 to repeatedly rise and fall via the connecting block 7414, impacting the medium inside the cylinder 7421. The medium impacts and strikes the piston 7423, causing the impact piston 7423 to repeatedly strike the impact head 7431, which in turn repeatedly impacts the pipe wall of the two-way pipe blank 9, accelerating metal fatigue and assisting the water pressure in forming the two-way pipe blank 9. The water generated by the impact water wheel 7411 flows into the right end of the water guide pipe 72 through the second water guide groove 726, and then enters the space between the pressure block 812 and the pipe wall of the two-way pipe blank 9 through the third water guide groove 821. When the second sealing head seals the two-way pipe blank 9, the spiral rod 8132 contacts the mold 6, causing the spiral rod 8132 to squeeze the pressure block 812. When the spiral rod 8132 squeezes the pressure block 812, the pressure block 812 squeezes the two-way pipe blank 9 into the plug pipe 81, causing the edge of the two-way pipe blank 9 to bend inward. At the same time as the spiral rod 8132 retracts into the spiral groove 8131, the spiral rod 8132 rotates synchronously. When the spiral rod 8132 is completely retracted into the spiral groove 8131, the spiral rod 8132 rotates to the bottom of the pressure block 812, pushing the pressure block 812 into the limiting groove 811, without affecting the two-way pipe blank 9. The above reference Figure 8 , Figure 9 , Figure 10 and Figure 11 When water enters through the third water guide channel 821 to squeeze the two-way pipe blank 9, the water is squeezed along the bend of the edge of the two-way pipe blank 9 because the edge of the two-way pipe blank 9 has been bent inward, and the inner mold head 73 is used to change the diameter of the two-way pipe blank 9. After the water fills the water injection pipe 71, the second oil cylinder 76 and the fourth oil cylinder 84 work simultaneously, respectively driving the first extrusion rod 75 and the second extrusion rod 83 to insert into the water injection pipe 71 and the water guide seat 82 to extrude the internal water, further pressurizing the water and completing the final molding.

[0025] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A mechanical device for forming ultra-large diameter Y-type variable diameter tee based on cold extrusion, comprising a mold (6) and a mold opening and closing mechanism for driving the mold (6) to open and close the mold, characterized in that, The mold (6) is provided with a water injection molding mechanism (7) and a variable diameter molding mechanism (8) on both sides. The water injection molding mechanism (7) includes a first sealing head, which is equipped with an auxiliary molding component (74) for assisting impact molding. The first sealing head includes a water injection pipe (71), a water guide pipe (72), and an inner mold head (73) connected in sequence. The water injection pipe (71) is fixed on the connecting seat (13). The output end of the third oil cylinder (77) is fixedly connected to the end of the water injection pipe (71). The third cylinder (77) drives the water injection pipe (71) to move horizontally. The first extrusion rod (75) fits into the inner cavity of the water injection pipe (71), and the first extrusion rod (75) is slidably connected to the water injection pipe (71). The inside of the water injection pipe (71) is provided with a two-way water delivery groove (711), and the inside of the water guide pipe (72) is provided with a three-way water delivery groove (722). The two-way water delivery groove (711) and the three-way water delivery groove (722) are connected. The inside of the water guide pipe (72) is fixed with a block (723). The auxiliary molding component (74) consists of a hydraulic drive component (741), an impact component (742), and an impact component (743). The hydraulic drive component (741) consists of a water wheel (7411), a connecting rod (7412), a drive shaft (7413), and a connecting block (7414). The water wheel (7411) is rotatably connected to the water guide pipe (72). The connecting rod (7412) is eccentrically rotatably connected to the side of the water wheel (7411). One end of the drive shaft (7413) is hinged to the connecting rod (7412). The connecting block (7414) is fixed to the end of the drive shaft (7413). The impact component (742) consists of a cylinder (7421), a transmission piston (7422), and... The impact piston (7423) is constructed. The cylinder (7421) is fixed inside the water guide pipe (72). The transmission piston (7422) and the impact piston (7423) are slidably connected to both ends of the cylinder (7421). A medium is provided between the transmission piston (7422) and the impact piston (7423). The medium does not fill the inside of the cylinder (7421). The bottom of the transmission piston (7422) is fixedly connected to the connecting block (7414). The impact component (743) is composed of an impact head (7431) and a first spring (7432). The impact head (7431) is slidably connected to the water guide pipe (72). The first spring (7432) is sleeved on the impact head (7431). The water guide pipe (72) has a first installation chamber, a second installation chamber, and a third installation chamber inside, which are used to install the hydraulic drive component (741), the impact component (742), and the impact component (743). The second installation chamber is connected to the third installation chamber. The outer surface of the water guide pipe (72) is fixed with a first sealing plate (721) and a second sealing plate (724) for sealing the second and third installation chambers, respectively. The impact head (7431) is slidably connected to the second sealing plate (724). The first installation chamber forms a closed space with the water wheel (7411) through a plug (723). The water wheel (7411) has a first water guide groove (725) and a second water guide groove (726) on both sides. The inner cavities at both ends of the water guide pipe (72) pass through the first water guide groove (725) and the first installation chamber in sequence. The second water guide channel (726) is connected; water is sent into the water guide pipe (72) and the two-way pipe blank (9) through the two-way water delivery channel (711) and the three-way water delivery channel (722) respectively. Part of the water fills the space between the two-way pipe blank (9) and the water guide pipe (72) and squeezes the pipe wall of the two-way pipe blank (9). Part of the water impacts the water wheel (7411) through the first water guide channel (725) so that the water entering the water guide pipe (72) impacts the water wheel (7411) through the first water guide channel (725). The water wheel (7411) drives the transmission shaft (7413) to repeatedly rise and fall through the connecting rod (7412). The transmission shaft (7413) drives the transmission piston (7422) to repeatedly rise and fall through the connecting block (7414) and drives the impact head (7431) to impact the pipe wall of the two-way pipe blank (9) through the impact piston (7423). The variable diameter forming mechanism (8) includes a second sealing head, which is composed of a plug pipe (81) and a water guide seat (82). The plug pipe (81) is equipped with a pressing component for auxiliary variable diameter forming. The water guide seat (82) is provided with a third water guide groove (821). The third water guide groove (821) is used to discharge the high-pressure water generated when driving the auxiliary forming component (74), and the third water guide groove (821) guides the high-pressure water into the plug pipe (81) for secondary variable diameter forming. The pressing assembly consists of a pressing block (812) and an extrusion driving component (813). A limiting groove (811) is formed inside the plug (81). Both sides of the pressing block (812) are rotatably connected to the inner wall of the limiting groove (811). The extrusion driving component (813) consists of a spiral groove (8131), a spiral rod (8132), and a second spring (8133). The spiral groove (8131) is formed inside the plug (81), and the spiral groove (8131) The spiral rod (8132) is connected to the spiral groove (8131) in a spiral connection with the limiting groove (811). The second spring (8133) is sleeved on the spiral rod (8132). The two ends of the second spring (8133) abut against the inner walls of the spiral rod (8132) and the spiral groove (8131) respectively. The abutting surface between the spiral rod (8132) and the pressure block (812) is wedge-shaped, and the abutting surface between the pressure block (812) and the spiral rod (8132) is conical. The water generated by the impact water wheel (7411) flows into the right end of the guide pipe (72) through the second guide channel (726), and then enters the space between the pressure block (812) and the pipe wall of the two-way pipe blank (9) through the third guide channel (821). When the second sealing head seals the two-way pipe blank (9), the spiral rod (8132) will contact the mold (6), allowing the spiral rod (8132) to squeeze the pressure block (812). When the spiral rod (8132) squeezes the pressure block (812), the pressure block (812) squeezes the two-way pipe blank (9) into the plug pipe (81), causing the edge of the two-way pipe blank (9) to bend inward. As the spiral rod (8132) retracts into the spiral groove (8131), it rotates synchronously. When the spiral rod (8132) is completely retracted into the spiral groove (8131), it rotates to the bottom of the pressure block (812) and pushes the pressure block (812) into the limiting groove (811), without affecting the two-way pipe blank (9). When the water enters through the third water guide groove (821) to squeeze the two-way pipe blank (9), the water is squeezed along the bend of the edge of the two-way pipe blank (9) because the edge of the two-way pipe blank (9) has been bent inward. The water is then squeezed along the bend of the edge of the two-way pipe blank (9) and, together with the inner mold head (73), the two-way pipe blank (9) is shaped to change diameter.

2. The mechanical device for forming ultra-large diameter Y-type variable diameter tee based on cold extrusion according to claim 1, characterized in that, The mold opening and closing mechanism consists of a base (1), a guide rod (2), a top beam (3), a first oil cylinder (4), and a connecting beam (5). The guide rod (2) is fixed on the upper surface of the base (1), the top beam (3) is fixed on the top of the guide rod (2), the first oil cylinder (4) is fixed on the top beam (3), the connecting beam (5) is fixedly connected to the output end of the first oil cylinder (4), and the side of the connecting beam (5) is slidably connected to the guide rod (2).

3. The mechanical device for forming ultra-large diameter Y-type variable diameter tee based on cold extrusion according to claim 2, characterized in that, The mold (6) consists of an upper mold (61) and a lower mold (62). The lower mold (62) is fixed on the base (1), and the upper mold (61) is fixed on the bottom of the connecting beam (5). After the upper mold (61) and the lower mold (62) are joined together, the internal cavities at both ends match the shapes of the first sealing head and the second sealing head, respectively.

4. The mechanical device for forming ultra-large diameter Y-type variable diameter tee based on cold extrusion according to claim 2, characterized in that, The upper surface of the base (1) is provided with a first support seat (11), a second support seat (12) and a connecting seat (13). The first support seat (11) and the second support seat (12) are both fixedly connected to the base (1), and the connecting seat (13) is slidably connected to the base (1).

5. The mechanical device for forming ultra-large diameter Y-type variable diameter tee based on cold extrusion according to claim 4, characterized in that, The water injection molding mechanism (7) also includes a second oil cylinder (76) and a third oil cylinder (77). The second oil cylinder (76) and the third oil cylinder (77) are both fixed on the first support base (11). The output end of the second oil cylinder (76) is fixed with a first extrusion rod (75).

6. The mechanical device for forming ultra-large diameter Y-type variable diameter tee based on cold extrusion according to claim 5, characterized in that, The variable diameter forming mechanism (8) further includes a second extrusion rod (83), a fourth oil cylinder (84) and a fifth oil cylinder (85). The fourth oil cylinder (84) and the fifth oil cylinder (85) are both fixed on the second support base (12). The output end of the fifth oil cylinder (85) is fixedly connected to the water guide base (82). One end of the second extrusion rod (83) is fixedly connected to the output end of the fourth oil cylinder (84), and the other end of the second extrusion rod (83) is telescopically connected to the water guide base (82).

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