Drawing die and process for piston sleeve in active protective hood system

Abstract

The invention relates to the field of stretching production, in particular to a stretching die and technology for a piston sleeve in an active protection hood system.The stretching die comprises a stretching machining rack, a lubricating treatment assembly, a positioning constraint assembly and a cleaning treatment assembly, two supporting columns are vertically arranged at the upper end of the stretching machining rack, and a mounting die base is movably arranged between the two supporting columns; the lower ends of the two sides of the mounting die base are horizontally provided with supporting rotating shafts, the supporting rotating shafts rotationally penetrate through the supporting columns, when the device is used, the piston sleeve can be covered in an all-around mode through uniform spraying holes formed in the coating gland, then the piston sleeve can be lubricated in an all-around mode through lubricating oil connected into the lubricating assembly, and the lubricating effect is good. And meanwhile, the cleaning assembly is used in cooperation, cleaning operation can be conducted on the filter cover, an inner hole of the stretching module and a flow dividing groove in the later period, operation is easy and convenient, and during operation and use, a is clamped and limited in cooperation with the positioning and restraining assembly, and stretching operation is stable and reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of stretching production, in particular to a stretching die for a piston sleeve in an active protection hood system and a process. BACKGROUND

[0002] In the field of automobile active safety systems, the automobile active protection hood is driven by an active protection piston cylinder to achieve the protection action of lifting the hood. The principle is that a pyrotechnic / electronic actuator is driven to perform linear extension and retraction in a preset cavity, and is designed for active protection before / after a collision. The existing piston sleeve for active protection hoods is subjected to cold drawing processing using a stretching die in order to achieve the required surface quality of the sleeve. In order to avoid surface damage to the piston sleeve raw material, lubricating oil is sprayed on the surface of the piston sleeve raw material in advance during use of the current stretching die. However, the existing spraying mechanism directly drips from above, which has poor uniformity. In addition, after long-term use of the stretching die, some lubricants will carbonize and caramelize under the action of high temperature and high pressure for a long time, cannot be taken out with the steel pipe, and are left on the inner wall of the die hole, mixed with metal debris to form a composite scale layer, which is inconvenient to clean and has a long cycle. SUMMARY

[0003] The purpose of the present application is to provide a stretching die for a piston sleeve in an active protection hood system and a process to solve the problems raised in the background.

[0004] To achieve the above purpose, the present application provides the following technical solution: a stretching die for a piston sleeve in an active protection hood system, comprising: A stretching machine frame is vertically provided with two support columns at the upper end, and a mounting die holder is movably arranged between the two support columns. The lower end of the mounting die holder is horizontally provided with a support shaft on both sides, and the support shaft is rotatably arranged through the support column. A lubricating treatment assembly is provided, which comprises a transfer tank and a coating gland. A stretching module is inserted into the mounting die holder. The coating gland is fixed on one side of the mounting die holder by bolts, and one side of the coating gland abuts against the stretching module to stably lubricate the product entering the stretching module. A positioning and restraining assembly is arranged in the two support columns. The positioning and restraining assembly comprises four restraining inserts, which are respectively inserted into the two sides of the mounting die holder to stably constrain the mounting die holder in the processing position. A cleaning treatment assembly is arranged on one side of the stretching machine frame. The cleaning treatment assembly comprises a metal cleaning brush for cleaning the inner hole of the stretching module.

[0005] Preferably, a transfer groove is provided in the mounting mold base between two supporting shafts. One of the supporting shafts is connected to the transfer groove and has an L-shaped access groove. The L-shaped access groove is located inside the supporting column. A lubricating oil inlet groove and a drain outlet are provided through the supporting column near the L-shaped access groove. A drain pipe is provided below the drain outlet of the stretching processing frame. During normal stretching operation, the L-shaped access groove is connected to the lubricating oil inlet groove. A sealing ring is provided on the side of the lubricating oil inlet groove and the drain outlet near the supporting shaft.

[0006] Preferably, a locking screw head is threadedly connected to one side of the support shaft with the L-shaped access groove. Several extension rods are provided on one side of the locking screw head. One side of the several extension rods is inserted into the transfer groove and together they are provided with a filter cover. The extension rods are located in the L-shaped access groove, and lubricating oil can enter from the gap between the L-shaped access groove and the extension rods.

[0007] Preferably, a transfer pipe is horizontally provided at the lower end of one side of the coating cap, and one side of the transfer pipe is inserted into the transfer groove. A flow divider is provided inside the coating cap, and a plurality of uniform spray holes are provided in the flow divider through the inner ring of the coating cap. The plurality of uniform spray holes point to the inner hole of the stretching module respectively, and a transfer groove is provided between the transfer pipe and the flow divider.

[0008] Preferably, a three-way ball valve is inserted into the end of the transfer trough away from the L-shaped access trough, through a support shaft. A support column extends out from the side of the support shaft with the three-way ball valve and is fitted with a flip gear. A one-way valve is inserted into the side of the transfer trough near the three-way ball valve.

[0009] Preferably, each of the support columns has two storage grooves on the side near the mounting base, and each of the support columns has a piston groove on the side near the storage groove. A pressing rod is movably connected between the piston groove and the storage groove. A constraint block is located in the storage groove and connected to the pressing rod. Each of the mounting bases has a positioning slot on the side near the storage groove. One side of the constraint block is inserted into the positioning slot, and the side of the constraint block inserted into the positioning slot has a tapered calibration surface.

[0010] Preferably, the pressing rod is provided with a pushing piston on one side of the piston groove, and a retraction spring is sleeved on the side of the pressing rod located in the piston groove. One side of the retraction spring is in contact with the pushing piston, and one side of the piston groove passes through the support column and is provided with an air inlet.

[0011] Preferably, the upper end of the stretching processing machine frame is provided with a lubricating oil collection groove and a cleaning separation groove. The lubricating oil collection groove is located on the side of the mounting mold base where the coating cap is provided. The lower end of the cleaning separation groove is provided with a through hole, and the stretching processing machine frame is provided with a guide tube at the lower end of the through hole.

[0012] Preferably, both sides of the guide tube are provided with strip grooves. Two lifting control cylinders are vertically provided near the lower end of the stretching processing frame close to the guide tube. The lower ends of the two lifting control cylinders are connected to a T-shaped control rod. The horizontal bar of the T-shaped control rod is movably inserted into the strip groove. The vertical bar of the T-shaped control rod passes through the guide tube and is inserted into the cleaning partition groove. A metal cleaning brush is provided at one end of the T-shaped control rod inserted into the cleaning partition groove. When the mounting mold base is in a horizontal position, the metal cleaning brush corresponds to the inner hole of the stretching module.

[0013] A process for using a stretching die for a piston sleeve in an active protection hood system includes the following steps: Step 1: When the mounting base is in a vertical position, the air inlets of the four piston slots are connected to the high-pressure air pipes. Push the piston and the constraint block into the positioning slot of the mounting base. Under the action of the conical calibration surface and side snapping of the constraint block, the vertical state of the mounting base is constrained and pressed. Step 2: During the piston sleeve stretching operation, the piston sleeve enters and passes through the stretching module from the coating cap direction. During this process, lubricating oil is fed into the inlet. After being filtered by the filter cap, the lubricating oil enters the transfer tank. Then, under the sealing action of the one-way valve, the lubricating oil enters the distribution tank under high pressure from the transfer pipe and finally is evenly sprayed onto the piston sleeve surface from the uniform spray hole. Step 3: When the filter cover is clogged, the servo motor and gears work together to mesh with the flip gear, controlling the mounting base to be in a horizontal position. The L-shaped inlet groove is disconnected from the lubricating oil inlet groove and connected to the drain outlet. At this time, the flushing airflow is connected to the three-way ball valve. After the high-pressure airflow releases the one-way blockage of the one-way valve, it blows towards the filter cover. The pollutants blown back onto the filter cover fall into the drain pipe from the L-shaped inlet groove and the drain outlet. Step 4: When the mounting base is in a horizontal position, the metal cleaning brush corresponds to the inner hole of the stretching module. At this time, the lifting control cylinder controls the metal cleaning brush to move up and down, so that the metal cleaning brush can clean the inner hole of the stretching module. In addition, when the drain pipe is closed through the electric control valve, the high-pressure cleaning fluid is connected to the three-way ball valve. The cleaning fluid is sprayed from the uniform spray hole into the inner hole of the stretching module to assist the metal cleaning brush in cleaning.

[0014] Compared with the prior art, the beneficial effects of the present invention are: When in use, this device can cover the piston sleeve in all directions through the uniform spray holes set on the coating cover. Then, the lubricating oil connected by the lubrication component can lubricate it in all directions. At the same time, with the use of the cleaning component, the filter cover, the inner hole of the stretching module and the diversion groove can be cleaned later. The operation is simple and convenient. When in use, the positioning constraint component can be used to clamp and limit 'a', and the stretching operation is stable and reliable. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial side-section structural diagram of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of part A; Figure 4 This is a schematic diagram showing the connection between the support shaft and the support column of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of part B; Figure 6 This is a schematic diagram showing the connection between the constraint plug and the mounting mold base of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of part C; Figure 8 This is a schematic diagram of the disassembled structure of the mounting mold base and stretching processing frame of the present invention.

[0016] In the diagram: 1. Stretching machine frame; 2. Mounting mold base; 3. Stretching module; 4. Coating cap; 5. Support shaft; 6. Transfer groove; 7. L-shaped access groove; 8. Three-way ball valve; 9. Reversing gear; 10. Lubricating oil inlet groove; 11. Drain outlet; 12. Drain pipe; 13. Filter cover; 14. Locking screw; 15. Extension rod; 16. One-way valve; 17. Adapter pipe; 18. Diverter groove; 19. Adapter groove; 20. Uniform spray hole; 21. Storage groove; 22. Positioning slot; 23. Constraint insert; 24. Piston groove; 25. Pressing rod; 26. Push piston; 27. Retraction spring; 28. Cleaning divider groove; 29. ​​Lifting control cylinder; 30. T-shaped control rod; 31. Metal cleaning brush. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit 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.

[0018] Please see Figures 1-8 The present invention provides the following technical solutions: A piston sleeve stretching die for an active protection shroud system includes a stretching processing frame 1. Two support columns are vertically mounted on the upper end of the stretching processing frame 1, and a mounting mold base 2 is movably mounted between the two support columns. Support shafts 5 are horizontally mounted on the lower ends of both sides of the mounting mold base 2, and the support shafts 5 rotatably pass through the support columns. A transfer groove 6 is formed inside the mounting mold base 2 between the two support shafts 5. One of the support shafts 5 has an L-shaped access groove 7 connected to the transfer groove 6. The L-shaped access groove 7 is located inside the support column, near the L-shaped access groove. The support column 7 has a through-hole for a lubricating oil inlet 10 and a drain outlet 11. The stretching frame 1 is located below the drain outlet 11 and is connected to a drain pipe 12. During normal stretching operation, the L-shaped inlet groove 7 is connected to the lubricating oil inlet groove 10. Both the lubricating oil inlet groove 10 and the drain outlet 11 are equipped with sealing rings on the side near the support shaft 5. The lower end of the drain pipe 12 can be sealed by an electrically controlled shut-off valve. When the support shaft 5 with the L-shaped inlet groove 7 rotates inside the support column, it is in direct metal-to-metal contact, which improves the stability of the support. A locking screw head 14 is threadedly connected to one side of the support shaft 5, which has an L-shaped access groove 7. Several extension rods 15 are provided on one side of the locking screw head 14. One side of the extension rods 15 is inserted into the transfer groove 6 and a filter cover 13 is provided together. The extension rods 15 are located in the L-shaped access groove 7. Lubricating oil can enter from the gap between the L-shaped access groove 7 and the extension rods 15. The lubricating oil is fed into the lubricating oil inlet 10 and connected to the circulating lubricating oil. When the mounting mold base 2 is vertical, the L-shaped access groove 7 is connected to the lubricating oil inlet 10, and lubricating oil can be continuously fed into the transfer groove 6.

[0019] Please refer to Figures 3-5 A lubrication treatment component is set up to provide all-round spray lubrication for the piston sleeve stretching. The lubrication treatment component includes a transfer groove 6 and a coating cap 4. A stretching module 3 is inserted into the mounting mold base 2. The coating cap 4 is fixed to one side of the mounting mold base 2 by bolts, and one side of the coating cap 4 abuts against the stretching module 3 to provide all-round stable lubrication for the product entering the stretching module 3. A transfer pipe 17 is horizontally provided at the lower end of one side of the coating cap 4. One side of the transfer pipe 17 is inserted into the transfer groove 6. A diversion groove 18 is opened in the coating cap 4. Several uniform spray holes 20 are opened through the inner ring of the coating cap 4 in the diversion groove 18. The several uniform spray holes 20 are respectively pointing to the inner hole of the stretching module 3. A transfer groove 19 is opened between the transfer pipe 17 and the diversion groove 18. The lubricating oil can be filtered through the filter cover 13 before entering the diversion groove 18, which can avoid clogging of the uniform spray holes 20 and the diversion groove 18.

[0020] The transfer trough 6 has a support shaft 5 inserted through the end of the transfer trough 6 away from the L-shaped access trough 7 and a three-way ball valve 8 inserted therein. The support shaft 5 with the three-way ball valve 8 extends out of the support column and is fitted with a flip gear 9. A one-way valve 16 is inserted into the transfer trough 6 on the side close to the three-way ball valve 8. The one-way valve 16 is designed so that when only lubricating oil is input, the lubricating oil will not enter the three-way ball valve 8. The three-way ball valve 8 can be connected to a cleaning solution and high-pressure gas. The high-pressure gas is the gas generated by the air compressor equipment commonly used in the factory. The cleaning solution needs to be adjusted according to the selection of the lubricating oil.

[0021] A positioning constraint assembly is installed to support and stabilize the mounting mold base 2. The positioning constraint assembly is located within two support columns and includes four constraint blocks 23. These four constraint blocks 23 are respectively inserted into both sides of the mounting mold base 2, stabilizing the mounting mold base 2 in the processing position. Two receiving grooves 21 are provided on the side of each support column closest to the mounting mold base 2. A piston groove 24 is also provided on the side of each support column closest to the receiving grooves 21. A pressing rod 25 is movably inserted between the piston groove 24 and the receiving groove 21. The constraint blocks 23 are located within the receiving grooves 21 and connected to the pressing rod 25. The mounting mold base 2 is positioned close to the receiving grooves 21... Each side has a positioning slot 22, and one side of each constraint block 23 is inserted into the positioning slot 22. The side of the constraint block 23 inserted into the positioning slot 22 has a tapered calibration surface. The pressing rod 25 is located in the piston groove 24 and has a pushing piston 26 on one side. The pressing rod 25 is located in the piston groove 24 and has a retraction spring 27 sleeved on one side. One side of the retraction spring 27 is in contact with the pushing piston 26. The piston groove 24 has a support column through it and an air inlet. The four constraint blocks 23 are inserted into the positioning slot 22 under high pressure to stably clamp and limit the movement of the mounting mold 2, thereby improving the stability of the mounting mold 2 during the stretching operation.

[0022] A cleaning component is installed to clean the inner hole of the stretching module 3 and the diversion groove 18. The cleaning component is located on one side of the stretching machine frame 1 and includes a metal cleaning brush 31. The upper end of the stretching machine frame 1 has a lubricating oil collection groove and a cleaning separation groove 28. The lubricating oil collection groove is located on the side of the mounting mold base 2 where the coating cap 4 is located. A through hole is provided at the lower end of the cleaning separation groove 28. A guide tube is provided at the lower end of the stretching machine frame 1 below the through hole. Strip grooves are provided on both sides of the guide tube. Two lifting control cylinders 29 are vertically installed at the lower end of the stretching machine frame 1 near the guide tube. The lower ends of the two lifting control cylinders 29 are connected to a T-shaped control rod 30. The horizontal rod of the T-shaped control rod 30 is movably inserted into the strip groove, and the vertical rod of the T-shaped control rod 30 passes through the guide tube and... The metal cleaning brush 31 is inserted into the cleaning partition groove 28. It is located at one end of the T-shaped control rod 30 inserted into the cleaning partition groove 28. When the mounting mold base 2 is in a horizontal position, the metal cleaning brush 31 corresponds to the inner hole of the stretching module 3. When the mounting mold base 2 is in a horizontal position, the metal cleaning brush 31 corresponds to the inner hole of the stretching module 3. At this time, the lifting control cylinder 29 controls the metal cleaning brush 31 to move up and down, so that the metal cleaning brush 31 can clean the inner hole of the stretching module 3. In addition, when the drain pipe 12 is closed through the electric control valve, the high-pressure cleaning fluid is connected to the three-way ball valve 8. The cleaning fluid is sprayed from the uniform spray hole 20 into the inner hole of the stretching module 3 to assist the metal cleaning brush 31 in cleaning. During this period, the cleaning solution enters the transfer tank 6 and the diversion tank 18 to decompose the oil stains on the diversion tank 18 and the filter cover 13, and the cleaning operation is carried out simultaneously.

[0023] A process for using a stretching die for a piston sleeve in an active protection hood system includes the following steps: Step 1: When the mounting base 2 is in a vertical position, the air inlets of the four piston slots 24 are connected to the high-pressure air pipe, pushing the piston 26 and the constraint block 23 into the positioning slot 22 of the mounting base 2. Under the action of the conical calibration surface and side snapping of the constraint block 23, the vertical state of the mounting base 2 is constrained and pressed. Step 2: During the piston sleeve stretching operation, the piston sleeve enters and passes through the stretching module 3 from the direction of the coating cap 4. During this period, lubricating oil is fed into the groove 10. After being filtered by the filter cap 13, the lubricating oil enters the transfer groove 6. Then, under the sealing action of the one-way valve 16, the lubricating oil enters the distribution groove 18 under high pressure from the transfer pipe 17. Finally, it is evenly sprayed onto the surface of the piston sleeve from the uniform spray hole 20. Step 3: When the filter cover 13 is blocked, the servo motor and gear mesh with the flip gear 9 to control the mounting base 2 to be in a horizontal position. The L-shaped inlet groove 7 is disconnected from the lubricating oil inlet groove 10 and connected to the drain outlet 11. At this time, the flushing airflow is connected to the three-way ball valve 8. After the high-pressure airflow releases the one-way blockage of the one-way valve 16, it blows towards the filter cover 13. The pollutants blown back onto the filter cover 13 fall into the drain pipe 12 from the L-shaped inlet groove 7 and the drain outlet 11. Step 4: When the mounting base 2 is in a horizontal position, the metal cleaning brush 31 corresponds to the inner hole of the stretching module 3. At this time, the lifting control cylinder 29 controls the metal cleaning brush 31 to move up and down, so that the metal cleaning brush 31 can clean the inner hole of the stretching module 3. In addition, when the drain pipe 12 is closed through the electric control valve, the high-pressure cleaning fluid is connected to the three-way ball valve 8. The cleaning fluid is sprayed from the uniform spray hole 20 into the inner hole of the stretching module 3 to assist the metal cleaning brush 31 in cleaning. It should be noted that if cleaning fluid is used, it needs to be rinsed several times with clean water and high-pressure air after use to avoid contaminating the lubricating oil.

[0024] 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 stretching die for a piston sleeve in an active protection shroud system, characterized in that, include: A stretching processing frame (1) is provided with two vertical support columns at the upper end of the stretching processing frame (1), and a mounting mold base (2) is provided movably between the two support columns. Support shafts (5) are provided horizontally at the lower ends of both sides of the mounting mold base (2), and the support shafts (5) are rotatably installed through the support columns. The lubrication treatment component includes a transfer tank (6) and a coating cap (4). A stretching module (3) is inserted into the mounting mold base (2). The coating cap (4) is fixed to one side of the mounting mold base (2) by bolts, and one side of the coating cap (4) abuts against the stretching module (3) to provide all-round stable lubrication for the product entering the stretching module (3). The positioning constraint component is located inside two support columns. The positioning constraint component includes four constraint blocks (23). The four constraint blocks (23) are respectively inserted into both sides of the mounting mold base (2) to stably constrain the mounting mold base (2) in the processing position. A cleaning component is provided on one side of the stretching frame (1). The cleaning component includes a metal cleaning brush (31) for cleaning the inner hole of the stretching module (3).

2. The stretching die for the piston sleeve in an active protection shroud system according to claim 1, characterized in that: The mounting base (2) has a transfer groove (6) between two support shafts (5). One of the support shafts (5) is connected to the transfer groove (6) and has an L-shaped access groove (7). The L-shaped access groove (7) is located inside the support column. A lubricating oil inlet groove (10) and a drain outlet (11) are provided through the support column near the L-shaped access groove (7). The stretching frame (1) is connected to a drain pipe (12) below the drain outlet (11). During normal stretching operation, the L-shaped access groove (7) is connected to the lubricating oil inlet groove (10). Both the lubricating oil inlet groove (10) and the drain outlet (11) are provided with sealing rings on the side near the support shaft (5).

3. The stretching die for the piston sleeve in an active protection shroud system according to claim 2, characterized in that: A locking screw head (14) is threadedly connected to one side of the support shaft (5) of the L-shaped access groove (7). Several extension rods (15) are provided on one side of the locking screw head (14). One side of the several extension rods (15) is inserted into the transfer groove (6) and a filter cover (13) is provided together. The extension rods (15) are located in the L-shaped access groove (7). Lubricating oil can enter from the gap between the L-shaped access groove (7) and the extension rods (15).

4. The stretching die for the piston sleeve in an active protection shroud system according to claim 3, characterized in that: A transfer tube (17) is horizontally provided at the lower end of one side of the coating cap (4). One side of the transfer tube (17) is inserted into the transfer groove (6). A flow divider (18) is provided inside the coating cap (4). A number of uniform spray holes (20) are provided through the inner ring of the coating cap (4) in the flow divider (18). The number of uniform spray holes (20) are respectively pointing to the inner hole of the stretching module (3). A transfer groove (19) is provided between the transfer tube (17) and the flow divider (18).

5. The stretching die for the piston sleeve in an active protection shroud system according to claim 4, characterized in that: The transfer groove (6) is located away from the L-shaped access groove (7). A support shaft (5) is inserted through the transfer groove (6) and a three-way ball valve (8) is inserted therein. A support column extends out from the support shaft (5) with the three-way ball valve (8) and a flip gear (9) is sleeved thereon. A one-way valve (16) is inserted into the transfer groove (6) on the side close to the three-way ball valve (8).

6. The stretching die for the piston sleeve in an active protection shroud system according to claim 5, characterized in that: Two storage grooves (21) are provided on the side of the support column near the mounting base (2). A piston groove (24) is provided on the side of the support column near the storage groove (21). A pressing rod (25) is movably inserted between the piston groove (24) and the storage groove (21). A constraint block (23) is located in the storage groove (21) and connected to the pressing rod (25). A positioning slot (22) is provided on the side of the mounting base (2) near the storage groove (21). One side of the constraint block (23) is inserted into the positioning slot (22). A conical calibration surface is provided on the side of the constraint block (23) inserted into the positioning slot (22).

7. The stretching die for the piston sleeve in an active protection shroud system according to claim 6, characterized in that: The pressing rod (25) is located in the piston groove (24) and a push piston (26) is provided on one side. A retraction spring (27) is sleeved on the side of the pressing rod (25) located in the piston groove (24). One side of the retraction spring (27) is in contact with the push piston (26), and one side of the piston groove (24) passes through the support column and is provided with an air inlet.

8. The stretching die for the piston sleeve in an active protection shroud system according to claim 7, characterized in that: The upper end of the stretching machine frame (1) is provided with a lubricating oil collection groove and a cleaning separation groove (28). The lubricating oil collection groove is located on the side of the mounting mold base (2) where the coating cover (4) is provided. The lower end of the cleaning separation groove (28) is provided with a through hole. The lower end of the stretching machine frame (1) is provided with a guide tube.

9. A stretching die for a piston sleeve in an active protection shroud system according to claim 8, characterized in that: Both sides of the guide tube are provided with strip grooves. The stretching machine frame (1) is provided with two lifting control cylinders (29) at the lower end of the guide tube. The lower ends of the two lifting control cylinders (29) are connected to a T-shaped control rod (30). The horizontal bar of the T-shaped control rod (30) is movably inserted into the strip groove. The vertical bar of the T-shaped control rod (30) passes through the guide tube and is inserted into the cleaning partition groove (28). The metal cleaning brush (31) is located at one end of the T-shaped control rod (30) inserted into the cleaning partition groove (28). When the mounting mold base (2) is in a horizontal position, the metal cleaning brush (31) corresponds to the inner hole of the stretching module (3).

10. A process for using a stretching die for a piston sleeve in an active protection hood system according to any one of claims 1-9, comprising the following steps: Step 1: When the mounting base (2) is in a vertical position, the air inlets of the four piston slots (24) are connected to the high-pressure air pipe, pushing the push piston (26) and the constraint plug (23) into the positioning slot (22) of the mounting base (2). Under the action of the conical calibration surface and side snapping of the constraint plug (23), the vertical state of the mounting base (2) is constrained and pressed. Step 2: During the piston sleeve stretching operation, the piston sleeve enters and passes through the stretching module (3) from the coating cap (4) direction. During this period, lubricating oil is fed into the groove (10) and then enters the transfer groove (6) after being filtered by the filter cap (13). Then, under the sealing action of the one-way valve (16), the lubricating oil enters the distribution groove (18) under high pressure from the transfer pipe (17) and finally is evenly sprayed onto the piston sleeve surface from the uniform spray hole (20). Step 3: When the filter cover (13) is blocked, the servo motor and gear mesh with the flip gear (9) to control the mounting base (2) to be in a horizontal position. The L-shaped inlet groove (7) is disconnected from the lubricating oil inlet groove (10) and connected to the drain outlet (11). At this time, the flushing airflow is connected to the three-way ball valve (8). After the high-pressure airflow releases the one-way blockage of the one-way valve (16), it blows towards the filter cover (13). The pollutants blown back onto the filter cover (13) fall into the drain pipe (12) from the L-shaped inlet groove (7) and the drain outlet (11). Step 4: When the mounting base (2) is in a horizontal position, the metal cleaning brush (31) corresponds to the inner hole of the stretching module (3). At this time, the lifting control cylinder (29) controls the metal cleaning brush (31) to move up and down, so that the metal cleaning brush (31) can clean the inner hole of the stretching module (3). In addition, when the drain pipe (12) is closed through the electric control valve, the three-way ball valve (8) is connected to the high-pressure cleaning fluid. The cleaning fluid is sprayed from the uniform spray hole (20) to the inner hole of the stretching module (3) to assist the metal cleaning brush (31) in cleaning.

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