Pneumatic pin capable of preventing rubber ring from being cut

Abstract

The pneumatic pin comprises a shell and a lock pin installed in the shell, a pin tongue is arranged at the front end of the lock pin, a spring is installed at the rear end of the lock pin, the other end of the spring abuts against the tail end of the shell, an inner hole of the shell is a stepped hole, the stepped hole forms a sealing cavity and a pressure relief cavity, and the inner diameter of the sealing cavity is smaller than that of the pressure relief cavity. The outer contour of the lock pin is matched with an inner hole of the shell, in the unlocked state, the thin shaft section on the lock pin is located in the sealing cavity, the thick shaft section of the lock pin is located in the pressure relief cavity, a sealing groove is formed in the thin shaft section of the pin shaft, a sliding sealing ring is installed in the sealing groove, and an air inlet in the shell is communicated with the sealing cavity and located in front of the sliding sealing ring. The air outlet is communicated with the pressure relief cavity. Through the design of the stepped hole, the function of first unlocking and then ventilation is achieved, the structure is simple, the size is small, reliability is high, and the problem of ring cutting of a lock pin rubber ring of a traditional pneumatic pin is solved.

Description

Technical Field

[0001] This invention relates to the field of pneumatic unlocking, and more particularly to a pneumatic pin for preventing the cutting of rubber rings. Background Technology

[0002] Pneumatic unlocking pins are widely used in many military and civilian devices. After the pneumatic pin unlocks, the device can unlock before it can operate; after the operation is completed, the pneumatic pin resets. Currently, domestic pneumatic pins with this function have a problem where the sealing ring on the locking pin is cut when passing through the air outlet. Therefore, preventing the sealing ring from being cut is an urgent problem to be solved. Summary of the Invention

[0003] The technical problem solved by the present invention is to provide a pneumatic pin that can prevent the rubber ring from being cut, enabling the system to unlock before it can operate.

[0004] The technical solution adopted in this invention is a pneumatic pin for preventing rubber ring cutting, including a housing and a locking pin installed in the housing. The front end of the locking pin is a pin tongue, and the rear end of the locking pin is equipped with a spring. The other end of the spring contacts the end of the housing. The inner hole of the housing is a stepped hole, which forms a sealing cavity and a pressure relief cavity. The inner diameter of the sealing cavity is smaller than the inner diameter of the pressure relief cavity. The outer contour of the locking pin is adapted to the inner hole of the housing. In the unlocked state, the thin shaft section of the locking pin is located in the sealing cavity, and the thick shaft section of the locking pin is located in the pressure relief cavity. A sealing groove is provided on the thin shaft section of the pin, and a sliding sealing ring is installed in the sealing groove. The air inlet on the housing is connected to the sealing cavity and is located before the sliding sealing ring; the air outlet is connected to the pressure relief cavity.

[0005] Sealing rings are installed at both the front and rear ends of the housing to seal the locking pin against the inner wall of the housing; A plug is installed at the rear end of the housing, the rear end of the spring is pressed against the plug, and a buffer washer is installed at the front end of the plug.

[0006] The step between the housing's sealing ring and the pressure relief chamber is chamfered to further ensure that the sliding sealing ring is not worn.

[0007] The advantages of this invention are that it has a simple structure, small size, and high reliability, and avoids the problem of traditional pneumatic pin locking rings cutting off. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the pneumatic pin for preventing rubber ring cutting according to the present invention; Figure 2 This is a cross-sectional view of the pneumatic pin preventing the rubber ring from being unlocked in the present invention. Figure 3 This is a cross-sectional view of the pneumatic pin unlocking state for preventing the rubber ring from being cut, according to the present invention. Reference numerals: 1-Housing, 11-Sealing cavity, 12-Pressure relief cavity, 2-Front sealing ring, 3-Sliding sealing ring, 4-Locking pin, 41-Thin shaft section, 42-Thick shaft section, 46-Locking tongue, 5-Rear sealing ring, 6-Spring, 7-Buffer washer, 8-Plug cap. Detailed Implementation

[0009] The invention will now be further described with reference to the accompanying drawings.

[0010] The pneumatic pin for preventing rubber ring cutting of the present invention includes a high-rigidity housing 1 for support and sealing, and a locking pin 4 installed in the housing. The inner hole of the housing is a stepped hole, which includes a sealing cavity 11 and a pressure relief cavity 12. The inner diameter of the sealing cavity 11 is smaller than the inner diameter of the pressure relief cavity 12. The outer contour of the locking pin 4 is adapted to the inner hole of the housing. In the unlocked state, the thin shaft section 41 of the locking pin 4 is located in the sealing cavity 11, and the thick shaft section 42 of the locking pin 4 is located in the pressure relief cavity 12. The thin shaft section 41 of the pin is provided with a sealing groove, and a sliding sealing ring 3 is installed in the sealing groove. The sliding sealing ring 3 moves with the locking pin 4. The air inlet on the housing 1 is connected to the sealing cavity 11 and is located in front of the sliding sealing ring 3; the air outlet is connected to the pressure relief cavity 13.

[0011] During installation, the front sealing ring 2 and the rear sealing ring 5 are first installed in the sealing grooves at the front and rear of the housing to achieve a seal between the locking pin 4 and the housing 1. After installing the sliding sealing ring 3 in the sealing groove of the locking pin 4, it is installed into the housing 1 from the rear. At the same time, the spring 6, the buffer washer 7, and the plug 8 are installed in sequence from the rear of the locking pin. The plug 8 is fixed to the rear end of the housing.

[0012] When the unlocking function is required, gas flows into the pneumatic pin assembly through the connecting pipe, entering between the front sealing ring 2 and the sliding sealing ring 3 in the sealing cavity 11. As the pressure increases, it pushes the locking pin 4 to retract backward, and the sliding sealing ring 3 moves backward with the locking pin 4. When the sliding sealing ring 3 is in the sealing cavity 11, it is in a sealed state, and the air outlet of the pneumatic pin is not connected. Inflation continues, and the locking pin 4 continues to retract backward until the sliding sealing ring 3 moves away from the sealing cavity 11 with the locking pin 4. At this point, the sliding sealing ring 3 loses its sealing function, and air flows through the pneumatic pin outlet. During the backward movement of the locking pin 4, the locking tongue 46 is designed to reach the unlocked position first, and then the sliding sealing ring 3 disengages from the sealing cavity 11; that is, unlocking occurs first, followed by air flow. After the function is completed, the device cuts off the gas supply, and the locking pin resets under the action of the spring force.

[0013] Due to the stepped inner hole design of the housing 1 and the engagement of the locking pin, the sliding sealing ring 3 does not contact the air outlet of the housing 1 during the movement of the locking pin. The sliding sealing ring 3 can complete its function simply by disengaging from the sealing cavity 11, without needing to move to the air outlet position. The pressure relief cavity 12 has a larger inner diameter than the sealing cavity, and the step at the connection between the pressure relief cavity and the sealing cavity is chamfered to further ensure that the sliding sealing ring is not worn. This reliably avoids the problem of ring cutting.

[0014] This invention employs a triple sealing design to ensure that the pneumatic pin unlocks first and then allows air to pass through, ensuring stability and reliability. The stepped hole design avoids the phenomenon of the locking pin sealing ring cutting off, resulting in a compact structure and stable and reliable operation.

Claims

1. A pneumatic pin for preventing rubber ring cutting, comprising a housing and a locking pin installed within the housing, wherein the front end of the locking pin is a pin tongue, and a spring is installed at the rear end of the locking pin, the other end of the spring abutting against the end of the housing, characterized in that: The inner hole of the housing is a stepped hole, which forms a sealing cavity and a pressure relief cavity. The inner diameter of the sealing cavity is smaller than that of the pressure relief cavity. The outer contour of the locking pin is adapted to the inner hole of the housing. In the unlocked state, the thin shaft section of the locking pin is located in the sealing cavity, and the thick shaft section of the locking pin is located in the pressure relief cavity. A sealing groove is provided on the thin shaft section of the pin, and a sliding sealing ring is installed in the sealing groove. The air inlet on the housing is connected to the sealing cavity and is located in front of the sliding sealing ring; the air outlet is connected to the pressure relief cavity.

2. The pneumatic pin for preventing rubber ring cutting as described in claim 1, characterized in that: A sealing ring is installed at the front end of the housing to seal the locking tongue and the inner wall of the housing.

3. The pneumatic pin for preventing rubber ring cutting as described in claim 1, characterized in that: A sealing ring is installed at the rear end of the housing to seal the rear end of the locking pin and the inner wall of the housing.

4. The pneumatic pin for preventing rubber ring cutting as described in claim 3, characterized in that: A cap is installed at the rear end of the housing, and the rear end of the spring is pressed against the cap.

5. The pneumatic pin for preventing rubber ring cutting as described in claim 1, characterized in that: A buffer washer is installed at the front end of the cap.

6. The pneumatic pin for preventing rubber ring cutting as described in claim 1, characterized in that: The step between the sealing ring of the housing and the pressure relief chamber is chamfered.

Images