Nitrogen spring overload protection structure of automobile fender stamping die

Abstract

The utility model belongs to the field of nitrogen springs, and particularly relates to a nitrogen spring overload protection structure of an automobile fender stamping die, which comprises a tank body, a piston rod is arranged in the tank body, a partition plate is fixedly sleeved in the tank body, an inflation pipe is fixedly sleeved in the partition plate, the inflation pipe is fixedly connected with the tank body, and the piston rod is arranged in the tank body. And an inflation valve is fixedly connected to the interior of the tank body and communicates with the inflation pipe, and a plugging bolt is connected to the interior of the tank body through threads. By designing the partition plate, the inner cavity of the tank body can be partitioned, when the compression amount of nitrogen is overloaded, air pressure can push the sliding plate to move downwards, separation of the plug and the through hole can be achieved, gas can be discharged into the lower portion of the partition plate through the through hole at the moment, the gas storage space of the inner wall of the tank body is enlarged, compressed nitrogen can be buffered at the moment, and the nitrogen pressure can be reduced; therefore, the purpose of overload protection can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen spring technology, specifically to a nitrogen spring overload protection structure for automobile fender stamping molds. Background Technology

[0002] The nitrogen spring in the stamping die for automotive fenders is the core elastic element, mainly used to provide stable and controllable elastic pressure to ensure that the sheet metal is evenly stressed and precisely conforms to the die cavity during the fender forming process. Its structure typically consists of a high-strength cylinder, a sealed piston, and a high-pressure nitrogen chamber.

[0003] Utility model patent CN217271627U discloses a nitrogen spring with overload protection function, including a cylinder. A base plate is fixedly connected to the bottom of the cylinder. A compression spring is fixedly connected to the upper surface of the base plate. A top plate is fixedly connected to the upper end of the compression spring. Four telescopic rods are fixedly connected to the edge between the top plate and the base plate. A fixing seat is fixedly connected to the bottom end of the outer surface of each telescopic rod. This nitrogen spring with overload protection function, through the arrangement of the cylinder, base plate, compression spring, top plate, telescopic rods, and fixing seats, ensures that in the event of an accidental overload, a piston block will first contact the top plate, applying downward pressure to compress the compression spring. The compression spring, during compression, will counteract the pressure from the piston block, thereby protecting the internal components of the nitrogen spring and preventing damage during pressure overload, significantly improving safety.

[0004] In the aforementioned prior art, the pressure from the piston block is offset by compressing a spring. However, if the pressure generated by the compression of nitrogen exceeds the spring's elastic limit, the pressure overload will still damage the internal structure of the nitrogen spring, resulting in insufficient overload protection. Therefore, improvements are needed. Utility Model Content

[0005] The purpose of this utility model is to provide a nitrogen spring overload protection structure for automobile fender stamping molds, which solves the problem of insufficient overload protection effect of nitrogen springs.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a nitrogen spring overload protection structure for an automobile fender stamping die, comprising a tank body, a piston rod disposed inside the tank body, a partition fixedly sleeved inside the tank body, an inflation pipe fixedly sleeved inside the partition, the inflation pipe being fixedly connected to the tank body, an inflation valve fixedly connected inside the tank body, the inflation valve communicating with the inflation pipe, a sealing bolt threadedly connected inside the tank body, the sealing bolt contacting the inflation valve, a buffer mechanism disposed on the partition, and an exhaust mechanism disposed on the tank body.

[0007] Preferably, the buffer mechanism includes a through hole. The partition has a through hole inside, and a plug is slidably connected inside the through hole. A sliding plate is fixedly connected to the bottom of the plug, and the sliding plate contacts the partition. The sliding plate is slidably connected to the tank and the inflation pipe, respectively. A connecting rod is fixedly connected to the bottom of the sliding plate, and a connecting sleeve is slidably fitted onto the outside of the connecting rod. The connecting sleeve is fixedly connected to the tank. A fixing rod is fixedly connected inside the connecting sleeve, and a first spring is provided on the outside of the fixing rod. The fixing rod is slidably connected to the connecting rod. By designing this buffer mechanism, the nitrogen pressure can be initially buffered.

[0008] Preferably, there are multiple through holes, which are arranged in a ring shape and evenly distributed inside the partition. The through holes are designed to allow gas to flow through them.

[0009] Preferably, one end of the first spring is fixedly connected to the connecting sleeve, and the other end of the first spring is fixedly connected to the connecting rod. The first spring is designed so that its force can be applied to the connecting rod.

[0010] Preferably, the exhaust mechanism includes exhaust pipes, with two symmetrically distributed exhaust pipes fixedly connected inside the tank. Each exhaust pipe has a dustproof mesh inside, and a plug is slidably fitted inside the exhaust pipe. A sliding rod is fixedly connected to the bottom of the plug, and a second spring is provided on the outside of the sliding rod. A support strip is slidably fitted on the outside of the sliding rod, and the support strip is fixedly connected to the exhaust pipe. By designing this exhaust mechanism, nitrogen gas can be exhausted and depressurized.

[0011] Preferably, one end of the second spring is fixedly connected to the block, and the other end of the second spring is fixedly connected to the support bar. By designing the second spring, its force can be applied to the block.

[0012] Preferably, a limiting ring is fixedly connected to the bottom of the slide rod, and the limiting ring contacts the support bar. By designing the limiting ring, the slide rod can be prevented from detaching from the support bar.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model uses a partition to divide the inner cavity of the tank. When the nitrogen compression is overloaded, the gas pressure will push the slide plate down, which can separate the plug from the through hole. At this time, the gas will be discharged into the lower part of the partition through the through hole, which increases the gas storage space on the inner wall of the tank. This can buffer the compressed nitrogen and reduce the nitrogen pressure, thereby achieving the purpose of overload protection.

[0015] 2. By designing the exhaust pipe, this utility model ensures that when the nitrogen compression is significantly overloaded, the sliding plate will continue to move downwards and separate from the inner wall of the tank. Subsequently, the gas will enter the exhaust pipe and be automatically depressurized and discharged through the exhaust pipe. This reduces the internal gas pressure and provides overload protection through multi-stage protection, thus greatly improving the protection effect on the nitrogen spring. Attached Figure Description

[0016] Figure 1 This is a three-dimensional view of the overall structure of this utility model;

[0017] Figure 2 This utility model Figure 1 A partial three-dimensional sectional view of the structure;

[0018] Figure 3 This utility model Figure 2 The front sectional view of the connecting sleeve;

[0019] Figure 4 This utility model Figure 2 A front sectional view of the exhaust pipe.

[0020] In the diagram: 1. Tank body; 2. Piston rod; 3. Baffle plate; 4. Inflation pipe; 5. Inflation valve; 6. Sealing bolt; 8. Buffer mechanism; 9. Exhaust mechanism; 81. Through hole; 82. Plug; 83. Slide plate; 84. Connecting rod; 85. Connecting sleeve; 86. Fixing rod; 87. First spring; 91. Exhaust pipe; 92. Dustproof net; 93. Plug; 94. Slide rod; 95. Second spring; 96. Support bar; 97. Limiting ring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1 , Figure 2 A nitrogen spring overload protection structure for a stamping die for an automobile fender includes a tank body 1, a piston rod 2 inside the tank body 1, a partition 3 fixedly sleeved inside the tank body 1, an inflation pipe 4 fixedly sleeved inside the partition 3, the inflation pipe 4 being fixedly connected to the tank body 1, an inflation valve 5 fixedly connected inside the tank body 1, the inflation valve 5 communicating with the inflation pipe 4, a sealing bolt 6 threadedly connected inside the tank body 1, the sealing bolt 6 contacting the inflation valve 5, a buffer mechanism 8 on the partition 3, and an exhaust mechanism 9 on the tank body 1.

[0023] Please see Figure 1 , Figure 2 , Figure 3 The buffer mechanism 8 includes a through hole 81. A through hole 81 is formed inside the partition 3. A plug 82 is slidably connected inside the through hole 81. There are multiple through holes 81, which are arranged in a ring and evenly distributed inside the partition 3. The through holes 81 are designed to allow gas to flow through them. A sliding plate 83 is fixedly connected to the bottom of the plug 82. The sliding plate 83 contacts the partition 3 and is slidably connected to both the tank 1 and the inflation pipe 4. A connecting rod 84 is fixedly connected to the bottom of the sliding plate 83. The outer side of the connecting rod 84... A connecting sleeve 85 is slidably sleeved and fixedly connected to the tank body 1. A fixing rod 86 is fixedly connected inside the connecting sleeve 85. A first spring 87 is provided on the outside of the fixing rod 86. One end of the first spring 87 is fixedly connected to the connecting sleeve 85, and the other end of the first spring 87 is fixedly connected to the connecting rod 84. By designing the first spring 87, the force of the first spring 87 can be applied to the connecting rod 84. The fixing rod 86 is slidably connected to the connecting rod 84. By designing the buffer mechanism 8, the nitrogen pressure can be initially buffered.

[0024] Please see Figure 1 , Figure 2 , Figure 4 The exhaust mechanism 9 includes an exhaust pipe 91. Two symmetrically distributed exhaust pipes 91 are fixedly connected inside the tank body 1. A dustproof net 92 is installed inside the exhaust pipe 91. A block 93 is slidably sleeved inside the exhaust pipe 91. A sliding rod 94 is fixedly connected to the bottom of the block 93. A second spring 95 is installed on the outside of the sliding rod 94. One end of the second spring 95 is fixedly connected to the block 93, and the other end of the second spring 95 is fixedly connected to the support bar 96. By designing the second spring 95, the force of the second spring 95 can act on the block 93. The support bar 96 is slidably sleeved on the outside of the sliding rod 94. The support bar 96 is fixedly connected to the exhaust pipe 91. A limit ring 97 is fixedly connected to the bottom of the sliding rod 94. The limit ring 97 contacts the support bar 96. By designing the limit ring 97, the sliding rod 94 can be prevented from separating from the support bar 96. By designing the exhaust mechanism 9, nitrogen can be exhausted and depressurized.

[0025] The specific implementation process of this utility model is as follows: During use, when the piston rod 2 moves down, the piston rod 2 will compress the nitrogen gas inside the cavity. When the nitrogen gas compression is overloaded, the gas pressure will act on the plug 82, and the gas will push the plug 82 down to separate from the through hole 81. At the same time, the plug 82 will drive the slide plate 83 and the connecting rod 84 down. The connecting rod 84 will slide along the connecting sleeve 85 and the fixing rod 86. The connecting rod 84 can compress the first spring 87. At this time, the nitrogen gas will flow down through the through hole 81 and be discharged into the lower part of the partition 3, which will increase the gas storage space inside the tank 1. At this time, the compressed nitrogen gas can be buffered, and the nitrogen gas pressure will be reduced, thereby achieving the purpose of overload protection. After the piston rod 2 is reset, under the elastic action of the first spring 87, the nitrogen gas can be pushed back into the upper cavity of the partition 3 for subsequent use.

[0026] During the downward movement of the slide plate 83, if the nitrogen compression is significantly overloaded, the continuous downward movement of the slide plate 83 will separate it from the inner wall of the tank 1. Subsequently, the gas will enter the interior of the exhaust pipe 91, and the gas will push the block 93 downward. The block 93 will drive the slide rod 94 and the limiting ring 97 downward. The block 93 will press down the second spring 95. At this time, the block 93 will separate from the inner wall of the exhaust pipe 91, and then the nitrogen will completely enter the interior of the exhaust pipe 91 and pass through the dustproof net 92 to complete the gas discharge. At this time, the internal gas pressure can be reduced. Overload protection is carried out through multi-stage protection, which can greatly improve the protection effect of the nitrogen spring.

[0027] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nitrogen spring anti-overload protection structure of an automobile fender stamping die, comprising a tank body (1), characterized in that: The inside of the tank body (1) is provided with a piston rod (2), the inside of the tank body (1) is fixedly sleeved with a partition plate (3), the inside of the partition plate (3) is fixedly sleeved with an inflation pipe (4), the inflation pipe (4) is fixedly connected with the tank body (1), the inside of the tank body (1) is fixedly connected with an inflation valve (5), the inflation valve (5) is communicated with the inflation pipe (4), the inside of the tank body (1) is connected with a plugging bolt (6) through screw connection, the plugging bolt (6) is in contact with the inflation valve (5), the partition plate (3) is provided with a buffer mechanism (8), and the tank body (1) is provided with an exhaust mechanism (9).

2. The nitrogen spring anti-overloading protection structure of the automobile fender stamping die according to claim 1, characterized in that: The buffer mechanism (8) comprises a through hole (81), the inside of the partition plate (3) is provided with a through hole (81), the inside of the through hole (81) is slidably connected with a plug (82), the bottom of the plug (82) is fixedly connected with a sliding plate (83), the sliding plate (83) is in contact with the partition plate (3), the sliding plate (83) is slidably connected with the tank body (1) and the inflation pipe (4) respectively, the bottom of the sliding plate (83) is fixedly connected with a connecting rod (84), the outer side of the connecting rod (84) is slidably sleeved with a connecting sleeve (85), the connecting sleeve (85) is fixedly connected with the tank body (1), the inside of the connecting sleeve (85) is fixedly connected with a fixed rod (86), the outer side of the fixed rod (86) is provided with a first spring (87), and the fixed rod (86) is slidably connected with the connecting rod (84).

3. The nitrogen spring anti-overloading protection structure of the automobile fender stamping die according to claim 2, characterized in that: The number of the through hole (81) is multiple, and the multiple through holes (81) are annularly and uniformly distributed in the inside of the partition plate (3).

4. The nitrogen spring anti-overloading protection structure of the automobile fender stamping die according to claim 2, characterized in that: One end of the first spring (87) is fixedly connected with the connecting sleeve (85), and the other end of the first spring (87) is fixedly connected with the connecting rod (84).

5. The nitrogen spring anti-overloading protection structure of an automobile fender stamping die according to claim 1, characterized in that: The exhaust mechanism (9) comprises an exhaust pipe (91), the inside of the tank body (1) is fixedly connected with two exhaust pipes (91) which are symmetrically distributed, the inside of the exhaust pipe (91) is provided with a dust screen (92), the inside of the exhaust pipe (91) is slidably sleeved with a block (93), the bottom of the block (93) is fixedly connected with a sliding rod (94), the outer side of the sliding rod (94) is provided with a second spring (95), the outer side of the sliding rod (94) is slidably sleeved with a support strip (96), and the support strip (96) is fixedly connected with the exhaust pipe (91).

6. The nitrogen spring anti-overloading protection structure of an automobile fender stamping die according to claim 5, characterized in that: One end of the second spring (95) is fixedly connected with the block (93), and the other end of the second spring (95) is fixedly connected with the support strip (96).

7. The nitrogen spring anti-overloading protection structure of an automobile fender stamping die according to claim 5, characterized in that: The bottom of the sliding rod (94) is fixedly connected with a limiting ring (97), and the limiting ring (97) is in contact with the support strip (96).

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