A high-safety clamping pneumatic cylinder

Abstract

The application discloses a high-safety clamping air cylinder and belongs to the clamping air cylinder field. The high-safety clamping air cylinder comprises an air cylinder, an electromagnetic valve fixedly installed on the air cylinder and used for controlling an air path, a piston rod in telescopic connection with the air cylinder, a connecting rod fixedly installed on the piston rod, and a pressure head fixedly installed on the other end of the connecting rod. A self-locking mechanism cooperated with the connecting rod is arranged on the side of the air cylinder away from the pressure head. The self-locking mechanism comprises a self-locking box fixedly connected to the side of the air cylinder away from the pressure head. The high-safety clamping air cylinder is characterized in that the mechanical self-locking mechanism is independent of the air path control system. When the electromagnetic valve of the air cylinder is released, the self-locking mechanism needs to be unlocked. Therefore, when a power failure, air leakage or other faults occur, the self-locking mechanism will not be unlocked under the alarm of the external control system, so that the clamping force of the pressure head is maintained, the safety hidden danger of workpiece falling is solved, and the resetting problem after maintenance is avoided.

Description

Technical Field

[0001] This application relates to the field of clamping cylinder technology, specifically a high-safety clamping cylinder. Background Technology

[0002] A clamping cylinder is a pneumatic actuator driven by compressed air, mainly used in industrial automation to clamp, fix or position workpieces. Its core function is to convert air pressure energy into mechanical force, and through the movement of pistons or swinging parts, to achieve rapid clamping and release of workpieces. It is widely used in assembly, processing, and handling scenarios.

[0003] The clamping cylinder uses an air pump or compressor to supply compressed air, and the air intake or exhaust is regulated by the air circuit control system to achieve clamping or releasing actions. However, when the air circuit control system fails, the piston rod loses its driving force, causing the pressure head to lose its clamping force, releasing the workpiece and causing it to fall off, creating a safety hazard. Even after maintenance, it cannot be accurately reset, affecting machining accuracy.

[0004] Therefore, this application provides a clamping cylinder with high safety to solve the above problems. Utility Model Content

[0005] This application provides a high-safety clamping cylinder, which aims to solve the problem mentioned in the background art that existing clamping cylinders cannot continue to provide clamping force when the air circuit control system fails, causing the pressure head to release the workpiece, resulting in safety problems and affecting the quality of subsequent processing.

[0006] To achieve the above objectives, this application provides the following technical solution: a high-safety clamping cylinder, comprising a cylinder, a solenoid valve fixedly mounted on the cylinder for controlling the air circuit, a piston rod telescopically connected to the cylinder, a connecting rod fixedly mounted on the piston rod, and a pressure head fixedly mounted on the other end of the connecting rod. A self-locking mechanism cooperating with the connecting rod is provided on the side of the cylinder away from the pressure head. The self-locking mechanism includes a self-locking box fixedly connected to the side of the cylinder away from the pressure head, and a ratchet rod fixedly mounted on the end of the connecting rod away from the pressure head and passing through the self-locking box. The system comprises a ratchet chuck that meshes with the ratchet teeth and slides along the inner wall of the self-locking housing to limit the ratchet's retraction; a moving iron core fixedly connected to the side of the ratchet chuck away from the ratchet and penetrating the side wall of the self-locking housing; a housing fitted around the moving iron core and fixedly connected to the side of the self-locking housing; an electromagnetic coil fitted around the moving iron core and nested within the inner wall of the housing; and a conical compression spring fitted around the moving iron core to push the ratchet chuck closer to the ratchet. The electromagnetic coil's switch and the electromagnetic valve are both connected to an external control system. In this way, the mechanical self-locking mechanism is independent of the pneumatic control system. The release operation of the cylinder's electromagnetic valve requires the unlocking of the self-locking mechanism. Therefore, in the event of power failure, air leakage, or other malfunctions, the self-locking mechanism will not unlock upon alarm from the external control system, thus maintaining the clamping force of the pressure head, completely eliminating the safety hazard of workpiece detachment, and avoiding the difficulty of resetting after maintenance.

[0007] Preferably, the two ends of the conical compression spring are in contact with the ratchet head and the inner wall of the self-locking box, respectively.

[0008] Preferably, the ratchet head is provided with symmetrical sliding wings on both sides, and the inner wall of the self-locking box is provided with a sliding groove that is slidably connected to the sliding wings.

[0009] Preferably, the ratchet bar has a T-shaped slide rail on the side away from the tooth surface, and the inner wall of the self-locking box has a T-shaped slide groove that is slidably connected to the T-shaped slide rail.

[0010] Preferably, the ratchet rod moves in the same direction as the piston rod.

[0011] Preferably, the self-locking box has a cover fixedly installed on the side away from the cylinder by screws.

[0012] Preferably, the housing has lugs for screws to pass through.

[0013] Preferably, a locking bolt is screwed onto the connecting rod, extending through the end of the ratchet rod.

[0014] This highly secure clamping cylinder features a mechanical self-locking mechanism independent of the pneumatic control system. When the cylinder's solenoid valve performs a release operation, it requires the self-locking mechanism to unlock in coordination with the release. Therefore, in the event of power failure, air leakage, or other malfunctions, the self-locking mechanism will not unlock under the alarm of the external control system, thus maintaining the clamping force of the pressure head. This completely eliminates the safety hazard of workpiece detachment and avoids the problem of resetting after maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a high-safety clamping cylinder.

[0016] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0017] Figure 3 This is a schematic diagram of the internal structure of the self-locking box and housing of a high-safety clamping cylinder.

[0018] In the picture:

[0019] 1. Cylinder; 11. Piston rod; 12. Solenoid valve; 13. Self-locking box; 131. Box cover;

[0020] 2. Connecting rod; 21. Locking bolt;

[0021] 3. Pressure head;

[0022] 4. Self-locking mechanism; 41. Rattle bar; 411. T-shaped slide rail; 42. Rattle chuck; 421. Sliding wing; 43. Moving iron core; 44. Conical compression spring; 45. Housing; 451. Ear; 46. Electromagnetic coil. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] This embodiment provides a clamping cylinder with high safety, such as Figures 1-3As shown, this high-safety clamping cylinder includes a cylinder 1, a solenoid valve 12 fixedly mounted on the cylinder 1 for controlling the air circuit, a piston rod 11 telescopically connected to the cylinder 1, a connecting rod 2 fixedly mounted on the piston rod 11, and a pressure head 3 fixedly mounted on the other end of the connecting rod 2. A self-locking mechanism 4 cooperating with the connecting rod 2 is provided on the side of the cylinder 1 away from the pressure head 3. The self-locking mechanism 4 includes a self-locking box 13 fixedly connected to the side of the cylinder 1 away from the pressure head 3, a ratchet bar 41 fixedly mounted on the end of the connecting rod 2 away from the pressure head 3 and passing through the self-locking box 13, and a ratchet bar 41 that meshes with the teeth of the ratchet bar 41 and slides in connection with the inner wall of the self-locking box 13 to limit the ratchet. The system includes a ratchet chuck 42 that retracts from the lever 41, a moving iron core 43 fixedly connected to the side of the ratchet chuck 42 away from the ratchet lever 41 and penetrating the side wall of the self-locking box 13, a housing 45 fitted outside the moving iron core 43 and fixedly connected to the side of the self-locking box 13, an electromagnetic coil 46 fitted outside the moving iron core 43 and nested in the inner wall of the housing 45, and a conical compression spring 44 fitted outside the moving iron core 43 for pushing the ratchet chuck 42 toward the ratchet lever 41. The two ends of the conical compression spring 44 are in contact with the ratchet chuck 42 and the inner wall of the self-locking box 13, respectively. The switch of the electromagnetic coil 46 and the solenoid valve 12 are both connected to an external control system.

[0025] During use, when clamping, the external control system supplies air to the cylinder 1 via the solenoid valve 12, causing the piston rod 11 to extend and push the connecting rod 2 and the pressure head 3 to clamp the workpiece. The ratchet bar 41 extends outward along with the connecting rod 2, and the ratchet chuck 42, under the action of the conical spring 44, engages with the ratchet gap, forming a mechanical self-locking mechanism. Even if the air circuit is de-energized or fails, the piston rod 11 cannot retract. When releasing, the external control system energizes the solenoid coil 46, and the moving iron core 43 is attracted by magnetic force, causing the ratchet chuck 42 to disengage from the ratchet bar 41, thus releasing the self-locking mechanism. In a synchronized manner, the solenoid valve 12 switches the air path direction, the piston rod 11 retracts, and the connecting rod 2 and pressure head 3 release the workpiece. After power failure, the conical spring 44 pushes the ratchet chuck 42 to re-engage with the ratchet rod 41, restoring the self-locking state. If the air path suddenly loses power or malfunctions, the external control system receives an alarm and no longer issues an unlocking command. Therefore, it will not supply power to the solenoid coil 46. Due to mechanical self-locking, the ratchet chuck 42 still holds the ratchet rod 41, the piston rod 11 cannot retract, and the pressure head 3 continues to maintain clamping force, preventing the workpiece from falling off.

[0026] Specifically, the ratchet chuck 42 has symmetrically arranged sliding wings 421 on both sides, and the inner wall of the self-locking box 13 has a sliding groove that slides and connects with the sliding wings 421. The sliding wings 421 are embedded in the sliding groove of the inner wall of the self-locking box 13 to form a sliding pair. Through the cooperation of the sliding wings and the sliding groove, the movement trajectory of the ratchet chuck 42 is ensured to be accurate, avoiding jamming or engagement failure caused by deviation, and improving the operational reliability of the self-locking mechanism.

[0027] Specifically, the ratchet bar 41 has a T-shaped slide rail 411 on the side away from the tooth surface, and the inner wall of the self-locking box 13 has a T-shaped groove that slides in connection with the T-shaped slide rail 411. The T-shaped structure enhances the anti-disengagement capability of the sliding connection, avoids separation of the slide rail and the groove due to vibration or impact, and improves structural stability. At the same time, it precisely guides the movement direction of the ratchet bar 41 to ensure its meshing accuracy with the ratchet chuck 42.

[0028] Understandably, the ratchet rod 41 and the piston rod 11 move in the same direction. The synchronous motion design ensures that the action of the self-locking mechanism 4 is completely matched with the stroke of the piston rod 11, realizing coordinated control of the self-locking mechanism 4 unlocking when the piston rod 11 extends and locking when it retracts, thus avoiding self-locking failure caused by asynchronous movement.

[0029] Furthermore, a cover 131 is fixedly installed on the side of the self-locking box 13 away from the cylinder 1 by screws; the screw fixing method facilitates the quick disassembly of the cover 131, making it convenient to inspect, lubricate or replace the internal components of the self-locking box 13; at the same time, the cover 131 can prevent external dust and impurities from entering the self-locking box 13, protecting the internal precision structure.

[0030] Furthermore, the housing 45 has lugs 451 for screws to pass through; the engagement of lugs 451 with screws enables reliable fixing of the housing 45, preventing displacement of the housing 45 due to equipment vibration, ensuring the stable installation position of the internal self-locking mechanism 4, and improving the vibration resistance and durability of the overall structure.

[0031] Furthermore, a locking bolt 21 is screwed onto the connecting rod 2, passing through the end of the ratchet rod 41; the screw connection facilitates the installation and adjustment of the locking bolt 21, while ensuring connection strength and preventing power transmission failure due to loosening; the design of the locking bolt 21 passing through the end of the ratchet rod 41 can prevent the ratchet rod 41 from dislodging from the connecting rod 2 during sliding, thereby improving transmission reliability.

[0032] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A high-safety clamping cylinder, comprising a cylinder (1), a solenoid valve (12) fixedly mounted on the cylinder (1) for controlling the air circuit, a piston rod (11) telescopically connected to the cylinder (1), a connecting rod (2) fixedly mounted on the piston rod (11), and a pressure head (3) fixedly mounted on the other end of the connecting rod (2), characterized in that: A self-locking mechanism (4) cooperating with the connecting rod (2) is provided on the side of the cylinder (1) away from the pressure head (3). The self-locking mechanism (4) includes a self-locking box (13) fixedly connected to the side of the cylinder (1) away from the pressure head (3), a ratchet rod (41) fixedly installed on the end of the connecting rod (2) away from the pressure head (3) and passing through the self-locking box (13), a ratchet chuck (42) that meshes with the teeth of the ratchet rod (41) and slides with the inner wall of the self-locking box (13) to limit the retraction of the ratchet rod (41), and a ratchet chuck (42) fixedly connected to the side of the ratchet chuck (42) away from the pressure head (3). The ratchet (41) includes a moving iron core (43) that extends through one side of the self-locking box (13), a housing (45) that is fitted outside the moving iron core (43) and fixedly connected to the side of the self-locking box (13), an electromagnetic coil (46) that is fitted outside the moving iron core (43) and nested inside the inner wall of the housing (45), and a conical compression spring (44) that is fitted outside the moving iron core (43) to push the ratchet chuck (42) toward the ratchet (41). The switch of the electromagnetic coil (46) and the electromagnetic valve (12) are both connected to an external control system.

2. The high-safety clamping cylinder according to claim 1, characterized in that: The two ends of the conical compression spring (44) are in contact with the ratchet head (42) and the inner wall of the self-locking box (13), respectively.

3. The high-safety clamping cylinder according to claim 2, characterized in that: The ratchet chuck (42) has symmetrically arranged sliding wings (421) on both sides, and the inner wall of the self-locking box (13) has a sliding groove that is slidably connected to the sliding wings (421).

4. The high-safety clamping cylinder according to claim 3, characterized in that: The ratchet bar (41) has a T-shaped slide rail (411) on the side away from the tooth surface, and the inner wall of the self-locking box (13) is provided with a T-shaped slide groove that is slidably connected to the T-shaped slide rail (411).

5. The high-safety clamping cylinder according to claim 4, characterized in that: The ratchet rod (41) moves in the same direction as the piston rod (11).

6. The high-safety clamping cylinder according to claim 5, characterized in that: The self-locking box (13) has a cover (131) fixed to the side away from the cylinder (1) by screws.

7. The high-safety clamping cylinder according to claim 6, characterized in that: The housing (45) has lugs (451) for screws to pass through.

8. The high-safety clamping cylinder according to claim 7, characterized in that: A locking bolt (21) is screwed onto the connecting rod (2) and passes through the end of the ratchet rod (41).

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