Pressure relief device for cold extrusion forming three-way pipe fitting process

Abstract

The invention discloses a pressure relief device for a cold extrusion forming three-way pipe fitting process, and relates to the technical field of cold extrusion forming three-way pipe fittings, the pressure relief device comprises a main body, a lower die and an upper die are arranged on the inner side of the main body, and hydraulic cylinders are fixedly connected to the inner wall of the main body and located on the left side and the right side of the lower die; the output end of the hydraulic cylinder is fixedly connected with a pressure head, the outer side of one pressure head is fixedly connected with a liquid conveying pipe, the front end of the liquid conveying pipe is fixedly connected with a pump body, the upper side of the pump body is fixedly connected with a connecting pipe, the outer side of the connecting pipe is fixedly connected with a liquid storage tank, and the outer side of the connecting pipe is provided with a one-way valve. According to the pressure relief device for the cold extrusion forming process of the three-way pipe fitting, by arranging the main body, the upper die, the lower die, the first supporting block, the first connecting rod, the lifting plate, the buffer air box and the side plate, when the pressure of the pipe blank in the die is relieved, the pipe blank is buffered conveniently, damage to the pipe blank is reduced, and the machining quality of the three-way pipe fitting is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of cold extrusion forming three-way pipe fittings, and particularly to a pressure relief device for a cold extrusion forming three-way pipe fitting process. Background Art

[0002] Cold extrusion forming is a metal plastic processing technology. By applying high pressure at room temperature or a lower temperature, the metal blank is deformed in a die to form a three-way pipe fitting with the required shape. This method has the advantages of high production efficiency, high material utilization rate, and good mechanical properties of products, and is widely used in high-pressure pipeline systems in industries such as petroleum, chemical industry, electric power, and shipbuilding. A three-way pipe is a pipe connector mainly used for diverting or converging fluids in a pipeline system.

[0003] After retrieval, a Chinese patent with the application number "CN201120119018.5" is specifically a three-way pipe extrusion forming device. The pipe blank is placed in the extrusion cavity formed by the upper die and the lower die, and the extrusion side cylinder applies pressure to seal the end of the pipe fitting with the extrusion head; the emulsified liquid in the liquid storage tank enters the two ends inside the pipe blank through the one-way valve, high-pressure cylinder, ultra-high pressure hose, and liquid filling channel, and the extrusion heads synchronously extrude the pipe blank. After the pipe blank is extruded, its volume becomes smaller, and the pressure of the emulsified liquid in the pipe blank increases as the volume of the pipe blank becomes smaller. During the extrusion process, the pressure sensor continuously detects the pressure of the emulsified liquid in the high-pressure cylinder; the servo system drives the proportional servo valve according to the pressure value signal detected by the pressure sensor to generate a control flow in the booster cylinder to push the booster piston to move left or right, increasing or decreasing the liquid output pressure of the high-pressure cylinder, thereby controlling the liquid filling pressure in the pipe blank; when the extrusion pressure reaches the pressure required for the branch pipe of the three-way pipe to bulge out, the pipe blank metal flows into the lower die branch hole to form a branch pipe, completing the extrusion forming; during unloading, the emulsified liquid flows back into the liquid storage tank through the liquid filling channel, ultra-high pressure hose, high-pressure cylinder, and one-way valve, and the flow rate during this period can be controlled by the servo system, reducing the burden on the operator and improving safety and reliability.

[0004] When processing cold-pressed formed three-way pipe fittings, by introducing a fluid into the pipe blank, simultaneously extruding the pipe blank to cold-press form the three-way pipe, and controlling the discharge of the fluid in the pipe blank during pressure relief. When the pressure relief of the fluid is unstable, it is easy to cause the pipe blank to collide with the inner wall of the die, affecting the processing quality of the three-way pipe fitting. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a pressure relief device for a cold extrusion forming three-way pipe fitting process, which solves the problem that the pipe fitting is easily damaged when the pressure relief of the fluid in the pipe blank is unstable.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0007] A pressure relief device for a cold extrusion forming tee pipe fitting process, comprising a main body. A lower die and an upper die are arranged inside the main body. Hydraulic cylinders are fixedly connected to both the left and right sides of the inner wall of the main body and located below the lower die. The output end of the hydraulic cylinder is fixedly connected with a pressure head. A liquid infusion pipe is fixedly connected to the outside of one of the pressure heads. The front end of the liquid infusion pipe is fixedly connected with a pump body. A connecting pipe is fixedly connected to the upper side of the pump body. A liquid storage tank is fixedly connected to the outside of the connecting pipe. A one-way valve is arranged on the outside of the connecting pipe. A pressure sensor is arranged on the outside of the pump body. A cavity formed by the upper die and the lower die is provided with a pipe blank of a tee pipe fitting. A buffer unit for buffering the pipe blank is arranged on the outside of the upper die and the lower die. A fixed cover is fixedly connected to the upper side of the upper die. A hydraulic rod is fixedly connected between the fixed cover and the main body.

[0008] Preferably, the buffer unit includes a bottom box fixedly connected to the lower side of the main body. A buffer assembly is arranged on the lower side of the lower die. The buffer assembly includes two mounting grooves one opened on the upper side of the lower die. A support block one is arranged inside the mounting groove one. A connecting rod one is fixedly connected to the lower side of the support block one. The lower end of the connecting rod one is fixedly connected with a lifting plate. A lifting block is fixedly connected to the lower side of the lifting plate. A buffer air box is arranged on the outside of the lifting block. Fixed frames are fixedly connected to both the upper and lower sides of the buffer air box. A bottom plate is fixedly connected to the inside of the bottom box. A bottom block is fixedly connected to the upper side of the bottom plate.

[0009] Preferably, side plates are fixedly connected to both the left and right sides of the fixed frame. A sliding groove is opened on the outside of the side plate. A slider is slidably connected to the inside of the sliding groove. An inclined plate one is rotatably connected to the outside of the slider. Connecting blocks are fixedly connected to the outside of the lifting plate and the bottom plate. The connecting block is rotatably connected to the inclined plate one. An air box one is fixedly connected to the front side of the side plate. A piston plate one is arranged inside the air box one. A push rod one is fixedly connected to the outside of the piston plate one. A control block is fixedly connected between the push rod one and the slider.

[0010] Preferably, a stabilizing component is arranged on the upper side of the upper die. The stabilizing component includes a mounting groove two opened on the lower side of the upper die. A support block two is arranged inside the mounting groove two. A connecting rod two is fixedly connected to the upper side of the support block two. The upper end of the connecting rod two passes through the upper side of the upper die and is fixedly connected with a top plate. Two rotating blocks one are fixedly connected to the upper side of the top plate. An inclined plate two is rotatably connected to the outside of the two rotating blocks one. A rotating block two is rotatably connected to the outside of the upper end of the inclined plate two. Moving blocks are fixedly connected to the upper sides of the left and right rotating blocks two. A fixed rod is fixedly connected to the inner wall of the fixed cover. A buffer spring is fixedly connected between the left and right moving blocks. A conveying pipe is fixedly connected to the outside of the air box one.

[0011] Preferably, a second air box is fixedly connected to the inner side of the fixed cover. A second piston plate is arranged inside the second air box. A second push rod is fixedly connected to the outer side of the second piston plate. An L-shaped block is fixedly connected to the outer end of the second push rod. A stabilizing block is fixedly connected between the L-shaped block and the moving block. The second air box is fixedly connected to the conveying pipe.

[0012] Preferably, the moving block is slidably connected to the fixed rod, and the second connecting rod is slidably connected to the upper die.

[0013] Preferably, the first inclined plates on the left and right sides are symmetrically distributed. The bottom block and the lifting block are both slidably connected to the buffer air box.

[0014] Beneficial effects

[0015] The present invention provides a pressure relief device for a cold extrusion forming process of a three-way pipe fitting. Compared with the prior art, the following beneficial effects are achieved:

[0016] (1) For the pressure relief device for the cold extrusion forming process of the three-way pipe fitting, by providing a main body, an upper die, a lower die, a first support block, a first connecting rod, a lifting plate, a buffer air box, and a side plate, it is convenient to buffer the pipe blank when the pressure in the mold is relieved, reduce damage to the pipe blank, and ensure the processing quality of the three-way pipe fitting.

[0017] (2) For the pressure relief device for the cold extrusion forming process of the three-way pipe fitting, by providing a second support block, a top plate, a second inclined plate, a fixed rod, a moving block, and a buffer spring, it is convenient to buffer the upper side of the pipe blank, and by providing a second air box, a second push rod, a conveying pipe, and an L-shaped block, the buffering effect on the upper side of the pipe blank is increased, and damage to the pipe blank is reduced. Description of the drawings

[0018] Figure 1 is the overall three-dimensional structure diagram of the present invention;

[0019] Figure 2 is Figure 1 the enlarged view of part A in

[0020] Figure 3 is the sectional three-dimensional structure diagram of the present invention;

[0021] Figure 4 is the sectional three-dimensional structure diagram of the buffer assembly in the present invention;

[0022] Figure 5 is Figure 4 the enlarged view of part B in

[0023] Figure 6 is the three-dimensional structure diagram of the buffer assembly in the present invention;

[0024] Figure 7 is the three-dimensional structure diagram of the stabilizing assembly in the present invention;

[0025] Figure 8 A sectional perspective view of the stabilizing component in the present invention;

[0026] Figure 9 is Figure 8 an enlarged view of part C in

[0027] In the figure: 1, main body; 2, lower die; 3, upper die; 4, fixed cover; 6, hydraulic rod; 7, pressing head; 8, hydraulic cylinder; 9, buffer unit; 10, infusion tube; 11, pump body; 12, pressure sensor; 13, liquid storage tank; 14, connecting pipe; 15, check valve; 91, bottom box; 92, buffer assembly; 95, stabilizing component;

[0028] 921, mounting groove 1; 922, support block 1; 923, connecting rod 1; 924, lifting plate; 925, lifting block; 926, buffer air tank; 927, fixed frame; 928, bottom block; 929, bottom plate; 9210, side plate; 9211, connecting block; 9212, inclined plate 1; 9213, sliding groove; 9214, slider; 9215, control block; 9216, push rod 1; 9217, piston plate 1; 9218, air tank 1; 9219, conveying pipe;

[0029] 951, mounting groove 2; 952, support block 2; 953, connecting rod 2; 954, top plate; 955, fixed rod; 956, rotating block 1; 957, inclined plate 2; 958, rotating block 2; 959, moving block; 9510, buffer spring; 9511, air tank 2; 9512, piston plate 2; 9513, push rod 2; 9514, L-shaped block; 9515, stabilizing block. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment 1

[0032] Please refer to Figure 1 - Figure 6, the present invention provides a technical solution: a pressure relief device for a cold extrusion forming tee pipe fitting process, including a main body 1, with a lower die 2 and an upper die 3 arranged inside the main body 1. Hydraulic cylinders 8 are fixedly connected to both the left and right sides of the inner wall of the main body 1 and located on both sides of the lower die 2. The output end of the hydraulic cylinder 8 is fixedly connected to a pressure head 7. A liquid infusion pipe 10 is fixedly connected to the outside of one of the pressure heads 7. The front end of the liquid infusion pipe 10 is fixedly connected to a pump body 11. A connecting pipe 14 is fixedly connected to the upper side of the pump body 11. A liquid storage tank 13 is fixedly connected to the outside of the connecting pipe 14. A one-way valve 15 is arranged on the outside of the connecting pipe 14. A pressure sensor 12 is arranged on the outside of the pump body 11. A cavity formed by the upper die 3 and the lower die 2 is provided with a pipe blank of the tee pipe fitting. A buffer unit 9 for buffering the pipe blank is arranged on the outside of the upper die 3 and the lower die 2. A fixed cover 4 is fixedly connected to the upper side of the upper die 3. A hydraulic rod 6 is fixedly connected between the fixed cover 4 and the main body 1. When processing the tee pipe fitting, first place the pipe blank in the mold, and then control the hydraulic rod 6 to drive the fixed cover 4 to descend. The fixed cover 4 drives the upper die 3 to descend, facilitating the positioning of the pipe blank. When shaping, control the hydraulic cylinders 8 on both sides to drive the pressure heads 7 to move, so that the pressure heads 7 extrude the pipe fitting, and start the pump body 11 to inject hydraulic oil into the pipe blank to form the tee pipe fitting. After the vehicle type is completed, start the pump body 11 to extract the hydraulic oil to complete pressure relief.

[0033] The buffer unit 9 includes a bottom box 91, and the bottom box 91 is fixedly connected to the lower side of the main body 1. A buffer assembly 92 is provided on the lower side of the lower die 2. The buffer assembly 92 includes two first mounting grooves 921. The two first mounting grooves 921 are opened on the upper side of the lower die 2. A first support block 922 is arranged inside the first mounting groove 921. A first connecting rod 923 is fixedly connected to the lower side of the first support block 922. The lower end of the first connecting rod 923 is fixedly connected to a lifting plate 924. A lifting block 925 is fixedly connected to the lower side of the lifting plate 924. A buffer air box 926 is arranged outside the lifting block 925. Fixed frames 927 are fixedly connected to both the upper and lower sides of the buffer air box 926. A bottom plate 929 is fixedly connected to the inside of the bottom box 91. A bottom block 928 is fixedly connected to the upper side of the bottom plate 929. The left and right first inclined plates 9212 are symmetrically distributed. Both the bottom block 928 and the lifting block 925 are slidably connected to the buffer air box 926. Side plates 9210 are fixedly connected to both the left and right sides of the fixed frame 927. A chute 9213 is opened on the outside of the side plate 9210. A slider 9214 is slidably connected to the inside of the chute 9213. A first inclined plate 9212 is rotatably connected to the outside of the slider 9214. Connecting blocks 9211 are fixedly connected to both the outside of the lifting plate 924 and the bottom plate 929. The connecting block 9211 is rotatably connected to the first inclined plate 9212. An air box one 9218 is fixedly connected to the front side of the side plate 9210. A first piston plate 9217 is arranged inside the air box one 9218. A first push rod 9216 is fixedly connected to the outside of the first piston plate 9217. A control block 9215 is fixedly connected between the first push rod 9216 and the slider 9214. When pressure relief is carried out, when the pressure relief is unstable, the pipe fitting vibrates slightly. The vibration drives the first support block 922 to descend. The first support block 922 drives the first connecting rod 923 to descend. The first connecting rod 923 drives the lifting plate 924 to descend. The lifting plate 924 drives the lifting block 925 to descend. The lifting block 925 drives the buffer air box 926 to descend. Since the buffer air box 926 is filled with inert gas, the inert gas buffers the vibration of the first support block 922, reduces the vibration of the pipe blank, avoids damage to the pipe blank during processing, and drives the fixed frame 927 to descend.

[0034] Embodiment Two

[0035] As Figure 7 - Figure 9As shown in the figure, a stabilizing component 95 is provided on the upper side of the upper die 3. The stabilizing component 95 includes a second mounting groove 951 which is opened on the lower side of the upper die 3. A second support block 952 is arranged inside the second mounting groove 951. A second connecting rod 953 is fixedly connected to the upper side of the second support block 952. The upper end of the second connecting rod 953 passes through the upper side of the upper die 3 and is fixedly connected to a top plate 954. Two first rotating blocks 956 are fixedly connected to the upper side of the top plate 954. A second inclined plate 957 is rotatably connected to the outer sides of the two first rotating blocks 956. A second rotating block 958 is rotatably connected to the outer side of the upper end of the second inclined plate 957. Moving blocks 959 are fixedly connected to the upper sides of the left and right second rotating blocks 958. A fixed rod 955 is fixedly connected to the inner wall of the fixed cover 4. A buffer spring 9510 is fixedly connected between the left and right moving blocks 959. A delivery pipe 9219 is fixedly connected to the outer side of the first air box 9218. A second air box 9511 is fixedly connected to the inner side of the fixed cover 4. A second piston plate 9512 is arranged inside the second air box 9511. A second push rod 9513 is fixedly connected to the outer side of the second piston plate 9512. The outer end of the second push rod 9513 is fixedly connected to an L-shaped block 9514. A stabilizing block 9515 is fixedly connected between the L-shaped block 9514 and the moving block 959. The second air box 9511 is fixedly connected to the delivery pipe 9219. The moving block 959 is slidably connected to the fixed rod 955. The second connecting rod 953 is slidably connected to the upper die 3. When buffering the upper side of the pipe blank, the fixed frame 927 drives the side plate 9210 to descend. At the same time, the lifting plate 924 drives the first inclined plate 9212 to rotate. The first inclined plate 9212 drives the slider 9214 to move. The slider 9214 drives the control block 9215 to move. The control block 9215 drives the first push rod 9216 to move. The first push rod 9216 drives the first piston plate 9217 to move, so that the first piston plate 9217 transports the gas in the first air box 9218 to the second air box 9511 through the delivery pipe 9219. The gas pushes the second piston plate 9512 to move. The second piston plate 9512 drives the second push rod 9513 to move. The second push rod 9513 drives the L-shaped block 9514 to move. The L-shaped block 9514 drives the stabilizing block 9515 to move. The stabilizing block 9515 drives the moving block 959 to move. At the same time, when the pipe blank vibrates, it drives the second support block 952 to move. The second support block 952 drives the second connecting rod 953 to move. The second connecting rod 953 drives the top plate 954 to move. The top plate 954 drives the second inclined plate 957 to rotate. Since the two second inclined plates 957 are symmetrically distributed, the second inclined plate 957 drives the moving block 959 to move. The two moving blocks 959 approach the inner wall of the fixed cover 4. First, initial buffering is carried out through the buffer spring 9510. And through the movement of the second piston plate 9512, it is convenient for the stabilizing block 9515 to drive the moving block 959 to move in the direction away from the inner wall of the fixed cover 4, reducing the movement frequency of the moving block 959, facilitating buffering of the upper side of the pipe blank, reducing the vibration amplitude of the pipe blank during pressure relief, and avoiding damage to the pipe fittings.

[0036] Working principle: During use, the staff first place the tube blank in the lower die 2, then control the hydraulic rod 6 to drive the upper die 3 to limit the tube blank, and then control the hydraulic cylinders 8 on both sides to control the pressing head 7 to extrude the pipe fitting. Then, start the pump body 11 to inject hydraulic oil into the tube blank to complete cold pressing. Then, through the pump body 11, draw the hydraulic oil into the liquid storage tank 13 to complete pressure relief. During the pressure relief process, when the tube blank vibrates, it drives the first support block 922 to descend. Under the action of the first connecting rod 923, the lifting plate 924, the lifting block 925, and the buffer air tank 926, buffer the lower side of the tube blank. At the same time, the buffer air tank 926 drives the upper side plate 9210 of the fixed frame 927 to descend. Under the action of the first inclined plate 9212, the slider 9214, the control block 9215, the first push rod 9216, and the first piston plate 9217, introduce gas into the second air tank 9511 and push the second piston plate 9512 to move. At the same time, the second support block 952 drives the top plate 954 to rise. Under the action of the second inclined plate 957, control the moving blocks 959 on both sides to move towards each other. At the same time, under the action of the second push rod 9513, the L-shaped block 9514, and the stabilizing block 9515, reduce the moving frequency of the moving block 959, which is convenient for buffering the upper side of the tube blank and avoiding damage to the three-way pipe fitting during pressure relief.

[0037] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure relief device for a cold extrusion forming tee pipe fitting process, comprising a main body (1). A lower die (2) and an upper die (3) are arranged inside the main body (1). Hydraulic cylinders (8) are fixedly connected to both the left and right sides of the inner wall of the main body (1) and located at the lower die (2). The output end of the hydraulic cylinder (8) is fixedly connected to a pressing head (7). A liquid infusion pipe (10) is fixedly connected to the outside of one of the pressing heads (7). The front end of the liquid infusion pipe (10) is fixedly connected to a pump body (11). A connecting pipe (14) is fixedly connected to the upper side of the pump body (11). A liquid storage tank (13) is fixedly connected to the outside of the connecting pipe (14). A one-way valve (15) is arranged on the outside of the connecting pipe (14). A pressure sensor (12) is arranged on the outside of the pump body (11), characterized in that: The cavity formed by the upper die (3) and the lower die (2) is provided with a tube blank of a three-way pipe fitting. A buffer unit (9) for buffering the tube blank is arranged on the outer sides of the upper die (3) and the lower die (2). A fixed cover (4) is fixedly connected to the upper side of the upper die (3), and a hydraulic rod (6) is fixedly connected between the fixed cover (4) and the main body (1).

2. The pressure relief device for the cold extrusion forming tee pipe fitting process according to claim 1, characterized in that: The buffer unit (9) includes a bottom box (91). The bottom box (91) is fixedly connected to the lower side of the main body (1). A buffer assembly (92) is arranged on the lower side of the lower die (2). The buffer assembly (92) includes two first mounting grooves (921). The two first mounting grooves (921) are opened on the upper side of the lower die (2). A first support block (922) is arranged inside the first mounting groove (921). A first connecting rod (923) is fixedly connected to the lower side of the first support block (922). The lower end of the first connecting rod (923) is fixedly connected to a lifting plate (924). A lifting block (925) is fixedly connected to the lower side of the lifting plate (924). A buffer air box (926) is arranged outside the lifting block (925). Fixed frames (927) are fixedly connected to both the upper and lower sides of the buffer air box (926). A bottom plate (929) is fixedly connected to the inside of the bottom box (91). A bottom block (928) is fixedly connected to the upper side of the bottom plate (929).

3. The pressure relief device for the cold extrusion forming tee pipe fitting process according to claim 2, wherein: Side plates (9210) are fixedly connected to both the left and right sides of the fixed frame (927). A sliding groove (9213) is opened on the outer side of the side plate (9210). A slider (9214) is slidably connected to the inside of the sliding groove (9213). An inclined plate one (9212) is rotatably connected to the outer side of the slider (9214). Connecting blocks (9211) are fixedly connected to the outer sides of the lifting plate (924) and the bottom plate (929). The connecting block (9211) is rotatably connected to the inclined plate one (9212). An air box one (9218) is fixedly connected to the front side of the side plate (9210). A piston plate one (9217) is arranged inside the air box one (9218). A push rod one (9216) is fixedly connected to the outer side of the piston plate one (9217). A control block (9215) is fixedly connected between the push rod one (9216) and the slider (9214).

4. The pressure relief device for the cold extrusion forming tee pipe fitting process according to claim 3, characterized in that: A stabilizing component (95) is provided on the upper side of the upper die (3). The stabilizing component (95) includes a second mounting groove (951) which is opened on the lower side of the upper die (3). A second support block (952) is arranged inside the second mounting groove (951). A second connecting rod (953) is fixedly connected to the upper side of the second support block (952). The upper end of the second connecting rod (953) passes through the upper side of the upper die (3) and is fixedly connected to a top plate (954). Two first rotating blocks (956) are fixedly connected to the upper side of the top plate (954). A second inclined plate (957) is rotatably connected to the outer sides of the two first rotating blocks (956). A second rotating block (958) is rotatably connected to the outer side of the upper end of the second inclined plate (957). Moving blocks (959) are fixedly connected to the upper sides of the second rotating blocks (958) on the left and right sides. A fixed rod (955) is fixedly connected to the inner wall of the fixed cover (4). A buffer spring (9510) is fixedly connected between the moving blocks (959) on the left and right sides. A delivery pipe (9219) is fixedly connected to the outer side of the first air box (9218).

5. The pressure relief device for a cold extrusion forming tee pipe fitting process according to claim 4, characterized in that: An second air box (9511) is fixedly connected to the inner side of the fixed cover (4). A second piston plate (9512) is arranged inside the second air box (9511). A second push rod (9513) is fixedly connected to the outer side of the second piston plate (9512). An L-shaped block (9514) is fixedly connected to the outer end of the second push rod (9513). A stabilizing block (9515) is fixedly connected between the L-shaped block (9514) and the moving block (959). The second air box (9511) is fixedly connected to the delivery pipe (9219).

6. The pressure relief device of a cold extrusion forming tee pipe fitting process according to claim 4, characterized in that: The moving block (959) is slidably connected to the fixed rod (955), and the second connecting rod (953) is slidably connected to the upper die (3).

7. The pressure relief device for the cold extrusion forming tee pipe fitting process according to claim 2, characterized in that: The first inclined plates (9212) on the left and right sides are symmetrically distributed. Both the bottom block (928) and the lifting block (925) are slidably connected to the buffer air box (926).

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