Connecting structure of mini piston rod and piston

Abstract

The utility model belongs to the technical field of air cylinders, and particularly relates to a mini piston rod and piston connecting structure which comprises a piston, an assembly hole is formed in the piston, a piston rod is inserted and assembled in the assembly hole, and a fixing nut is rotationally fixed to one end of the piston rod through threaded connection. A plurality of air pressure auxiliary locking mechanisms are arranged in the piston in an annular array mode, each air pressure auxiliary locking mechanism comprises an air channel, a lock piston is arranged in the air channel in a sliding mode, a fixing block is fixedly arranged in the air channel, a lock pin is fixedly arranged on one side of the lock piston, and the lock pin penetrates through the fixing block in a sliding mode. A reset spring is fixedly arranged between the fixing block and the lock piston, a plurality of sets of lock grooves are formed in the piston rod in an annular array mode, the lock grooves correspond to the lock pins in position, and additional fixing and limiting are provided between the piston and the piston rod through cooperation of an air pressure auxiliary locking mechanism. Mechanical faults or safety accidents caused by loosening are effectively avoided, and the safety performance of the whole system is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylinders, in particular to a connection structure of a mini piston rod and a piston. Background Art

[0002] A cylinder is a mechanical device that converts the pressure energy of compressed air into mechanical energy to provide power for linear reciprocating motion. It is widely used in many fields such as printing, semiconductors, automation control, and robotics. By controlling the inlet and outlet of compressed air, the cylinder can drive external equipment or actuators to work, of which the piston rod and piston are its important components.

[0003] The connection structure between the piston rod and the piston in the existing cylinder mainly includes: a threaded sleeve, a locking nut, etc. The locking nut is screwed into the threaded sleeve to lock the connection between the piston rod and the threaded sleeve to prevent loosening, thereby ensuring a firm and reliable connection between the piston and the piston rod, and allowing the piston rod to move smoothly in the cylinder.

[0004] The connection structure of the piston rod and the piston in the existing technology has the following disadvantages: although the traditional threaded connection can meet the basic connection requirements, it is prone to rotational loosening under the action of impact, vibration or alternating stress. The loosening may cause mechanical failure or safety accidents, thereby reducing the safety performance of the overall system. Therefore, a mini piston rod and piston connection structure is proposed to address the above problems. Utility Model Content

[0005] In order to make up for the shortcomings of the existing connection structure of the piston rod and the piston, a mini piston rod and piston connection structure is proposed to solve the problem that although the traditional threaded connection can meet the basic connection requirements, it is easy to become loose due to impact, vibration or alternating stress, and the looseness may cause mechanical failure or safety accidents, thereby reducing the safety performance of the overall system.

[0006] The technical solution adopted by the utility model to solve its technical problems is as follows: a miniature piston rod and piston connection structure described in the utility model comprises a piston, the piston is slidably arranged inside a cylinder body, an assembly hole is provided on the piston, a piston rod is inserted and assembled in the assembly hole, a fixing nut is fixedly provided on one side of the piston, one end of the piston rod is assembled with the fixing nut through a threaded connection, an array of gas pressure auxiliary locking mechanisms are arranged in an annular array in the piston, the gas pressure auxiliary locking mechanism comprises an airway, a lock piston is slidably arranged in the airway, a fixing block is fixedly provided in the airway, a lock pin is fixedly provided on one side of the lock piston, the lock pin slides through the fixing block, a reset spring is fixedly provided between the fixing block and the lock piston, an array of lock grooves are provided in an annular array on the piston rod, the positions of the lock groove and the lock pin are arranged correspondingly, and an additional fixed limit is provided between the piston and the piston rod through the cooperation of the gas pressure auxiliary locking mechanism, thereby effectively avoiding mechanical failures or safety accidents caused by looseness, and improving the safety performance of the overall system.

[0007] Preferably, an array of limit grooves is provided on the inner wall of the assembly hole, and an array of limit bars is provided on the piston rod corresponding to the limit grooves. The limit bars are slidably inserted into the limit grooves. The cooperation between the limit bars and the limit grooves prevents the piston rod from rotating due to external vibration or external force, thereby improving the reliability of the structure.

[0008] Preferably, two groups of first installation grooves are provided on the circumferential surface of the piston in a mirror-image manner, and a Y-shaped sealing ring is fixedly installed in the first installation groove. The cooperation of the Y-shaped sealing ring improves the sealing performance of the piston.

[0009] Preferably, a second mounting groove is provided on the circumferential surface of the piston, and a wear-resistant belt is fixedly mounted in the second mounting groove, which can protect key parts of the piston from wear and extend the service life of the piston.

[0010] Preferably, a third mounting groove is provided on the circumferential surface of the piston, and a magnetic ring is fixedly installed in the third mounting groove to detect the moving position of the piston. The magnetic switch will send a signal to provide feedback of the piston position to the control system.

[0011] Beneficial effects of the utility model:

[0012] The utility model provides a connection structure of a mini piston rod and a piston. The traditional threaded connection mechanism of the piston and the piston rod is prone to loosening under the action of impact, vibration or alternating stress, resulting in mechanical failure or safety accidents, and reducing the safety performance of the overall system. When the cylinder is ventilated, the cylinder body will be filled with gas and air pressure will be formed inside. The air pressure triggers the air pressure auxiliary locking mechanism, so that the locking pin is inserted into the locking groove opened on the piston rod under the action of air pressure, providing an additional fixed limit between the piston and the piston rod, and no external additional energy power drive is required, effectively avoiding mechanical failure or safety accidents caused by loosening, and improving the safety performance of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0014] Figure 1 It is an overall cross-sectional view of the connection structure between the piston rod and the piston;

[0015] Figure 2 yes Figure 1 The enlarged structure diagram at A in the middle;

[0016] Figure 3 It is a structural diagram of the position of the limit groove and the limit strip;

[0017] Legend:

[0018] 1. Piston; 2. Cylinder body; 3. Assembly hole; 4. Piston rod; 6. Fixing nut; 7. Air pressure assisted locking mechanism; 71. Airway; 72. Lock piston; 73. Fixing block; 74. Lock pin; 75. Reset spring; 8. Lock groove; 9. Limit groove; 10. Limit strip; 11. First installation groove; 12. Y-type sealing ring; 13. Second installation groove; 14. Wear-resistant belt; 15. Third installation groove; 16. Magnetic ring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Specific examples are given below.

[0021] See also Figure 1-Figure 3The utility model discloses a mini piston rod and piston connection structure, comprising a piston 1, wherein the piston 1 is slidably arranged inside a cylinder body 2, wherein an assembly hole 3 is provided on the piston 1, wherein a piston rod 4 is inserted and assembled into the assembly hole 3, wherein a fixing nut 6 is fixedly arranged on one side of the piston 1, wherein one end of the piston rod 4 is assembled with the fixing nut 6 through a threaded connection, wherein an array of gas pressure auxiliary locking mechanisms 7 are arranged in an annular array inside the piston 1, wherein the gas pressure auxiliary locking mechanism 7 comprises an air channel 71, wherein a locking piston 72 is slidably arranged in the air channel 7 ... A fixing block 73 is fixedly arranged in the channel 71, a locking pin 74 is fixedly arranged on one side of the locking piston 72, the locking pin 74 slides through the fixing block 73, a return spring 75 is fixedly arranged between the fixing block 73 and the locking piston 72, an array of locking grooves 8 are arranged in an annular array on the piston rod 4, the locking grooves 8 are arranged corresponding to the positions of the locking pins 74, an array of limiting grooves 9 are arranged on the inner wall of the assembly hole 3, an array of limiting strips 10 are arranged on the piston rod 4 corresponding to the limiting grooves 9, the limiting strips 10 are slidably inserted into the limiting grooves 9, and when working, the conventional piston and the movable The threaded connection mechanism of the plug rod is prone to loosening under the action of impact, vibration or alternating stress, resulting in mechanical failure or safety accidents, and reducing the safety performance of the overall system. In order to make the fixing structure between the piston and the piston rod more stable and reliable, the staff first inserts the piston rod 4 into the assembly hole 3 on the piston 1, and at the same time inserts the limit bar 10 into the limit groove 9, so that there will be no angular rotation between the piston rod 4 and the piston, and they always maintain a relatively static state, then rotate the fixing nut 6 to fix the piston rod 4 and the piston 1, and then complete the subsequent cylinder body 2 end cover and other accessories The installation can be carried out. When the cylinder is ventilated and working, the cylinder body 2 will be filled with gas and air pressure will be formed inside. After the gas enters the airway 71, it will push the lock piston 72 to move. The lock piston 72 drives the lock pin 74 to move. At the same time, the return spring 75 is compressed. The lock pin 74 is inserted into the lock groove 8 opened on the piston rod 4 under the action of air pressure, providing an additional fixed limit between the piston 1 and the piston rod 4 to prevent the piston rod 4 from rotating. No external additional energy source is required to drive it, which effectively avoids mechanical failure or safety accidents caused by looseness, thereby improving the safety performance of the overall system.

[0022] Furthermore, two groups of first mounting grooves 11 are mirror-imaged on the circumferential surface of the piston 1, and a Y-shaped sealing ring 12 is fixedly installed in the first mounting groove 11. During operation, while the piston 1 moves in the cylinder body 2, the two groups of Y-shaped sealing rings 12 provide sealing for the cylinder body 2, and the structural characteristics of the Y-shaped sealing ring 12 can also ensure the sealing and normal operation of the cylinder when wear occurs, thereby improving the service life.

[0023] Furthermore, a second mounting groove 13 is provided on the circumferential surface of the piston 1, and a wear-resistant belt 14 is fixedly installed in the second mounting groove 13. During operation, the wear-resistant belt 14 can protect the key parts of the piston 1 from wear and extend the service life of the piston 1. At the same time, it can reduce the friction coefficient, thereby reducing energy loss and noise, and improving the efficiency and stability of the mechanical equipment.

[0024] Furthermore, a third mounting groove 15 is provided on the circumferential surface of the piston 1, and a magnetic ring 16 is fixedly installed in the third mounting groove 15. When working, the magnetic ring 16 is used in conjunction with the magnetic switch outside the cylinder body 2 to detect the movement position of the piston 1 and accurately control the movement of the piston 1. At the same time, the friction between the piston 1 and the inner wall of the cylinder body 2 is reduced, the energy loss is reduced, and the working efficiency of the cylinder is improved.

[0025] Working principle: The traditional threaded connection mechanism between the piston and the piston rod is prone to loosening under the action of impact, vibration or alternating stress, resulting in mechanical failure or safety accidents, and reducing the safety performance of the overall system. In order to make the fixing structure between the piston and the piston rod more stable and reliable, the staff first inserts the piston rod 4 into the assembly hole 3 on the piston 1, and at the same time inserts the limit strip 10 into the limit groove 9, so that there will be no angular rotation between the piston rod 4 and the piston, and they always maintain a relatively static state, then rotate the fixing nut 6 to fix the piston rod 4 and the piston 1, and then complete the subsequent installation of the cylinder body 2 end cover and other accessories. When the cylinder is ventilated, the cylinder body 2 will be filled with gas and air pressure will be formed inside. After the gas enters the airway 71, it pushes the lock piston 72 to move, and the lock piston 72 drives the lock pin 74 to move. At the same time, the return spring 75 is compressed, and the lock pin 74 is inserted into the lock opened on the piston rod 4 under the action of air pressure. In the groove 8, an additional fixed limit is provided between the piston 1 and the piston rod 4, and no external additional energy source is required for driving, which effectively avoids mechanical failures or safety accidents caused by looseness and improves the safety performance of the overall system; when the piston 1 moves in the cylinder body 2, the two groups of Y-shaped sealing rings 12 provide sealing for the cylinder body 2, and the structural characteristics of the Y-shaped sealing rings 12 can also ensure the sealing and normal operation of the cylinder when wear occurs, and the service life is improved; the wear-resistant belt 14 can protect the key parts of the piston 1 from wear and extend the service life of the piston 1, and at the same time can reduce the friction coefficient, thereby reducing energy loss and noise, and improving the efficiency and stability of mechanical equipment; the magnetic ring 16 is used in conjunction with the magnetic switch outside the cylinder body 2 to detect the moving position of the piston 1, accurately control the action of the piston 1, and at the same time reduce the friction between the piston 1 and the inner wall of the cylinder body 2, reduce energy loss, and improve the working efficiency of the cylinder.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0027] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A connection structure of a mini piston rod and a piston, characterized in that: The invention comprises a piston (1), wherein the piston (1) is slidably arranged inside a cylinder body (2), wherein an assembly hole (3) is provided on the piston (1), wherein a piston rod (4) is inserted and assembled into the assembly hole (3), wherein a fixing nut (6) is fixedly arranged on one side of the piston (1), wherein one end of the piston rod (4) is assembled with the fixing nut (6) through a threaded connection, and wherein an array of pneumatic auxiliary locking mechanisms (7) are arranged in an annular array inside the piston (1), wherein the pneumatic auxiliary locking mechanism (7) comprises an air passage (71 ), a lock piston (72) is slidably arranged in the air passage (71), a fixed block (73) is fixedly arranged in the air passage (71), a lock pin (74) is fixedly arranged on one side of the lock piston (72), the lock pin (74) slides through the fixed block (73), a return spring (75) is fixedly arranged between the fixed block (73) and the lock piston (72), and a plurality of lock grooves (8) are arranged in an annular array on the piston rod (4), and the positions of the lock grooves (8) and the lock pin (74) are arranged correspondingly.

2. The connection structure of a mini piston rod and a piston according to claim 1, characterized in that: An array of limiting grooves (9) is provided on the inner wall of the assembly hole (3), and an array of limiting strips (10) is provided on the piston rod (4) corresponding to the limiting grooves (9), and the limiting strips (10) are slidably inserted into the limiting grooves (9).

3. The connection structure of a mini piston rod and a piston according to claim 1, characterized in that: Two groups of first installation grooves (11) are provided on the circumferential surface of the piston (1) in a mirror-image manner, and a Y-shaped sealing ring (12) is fixedly mounted in the first installation groove (11).

4. The connection structure of a mini piston rod and a piston according to claim 1, characterized in that: A second mounting groove (13) is provided on the circumferential surface of the piston (1), and a wear-resistant belt (14) is fixedly mounted in the second mounting groove (13).

5. The connection structure of a mini piston rod and a piston according to claim 1, characterized in that: A third mounting groove (15) is provided on the circumferential surface of the piston (1), and a magnetic ring (16) is fixedly mounted in the third mounting groove (15).

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