Self-lubricating sealing structure of pneumatic actuator

Abstract

The utility model relates to the technical field of pneumatic actuators, and discloses a self-lubricating sealing structure of a pneumatic actuator, which comprises a cylinder body, a self-lubricating mechanism is arranged in the cylinder body, a mounting mechanism is arranged on the outer side of the cylinder body, the self-lubricating mechanism comprises a piston top, the bottom of the piston top is rotatably connected with a rotating shaft, and the rotating shaft is connected with a sealing ring. And the outer side of the rotating shaft is fixedly connected with a rotating block. According to the self-lubricating sealing structure of the pneumatic actuator, lubricating oil is added into the penetrating hole in the piston top, the lubricating oil flows into the liquid inlet hole in the rotating block through the penetrating hole, ventilation is conducted in the cylinder body, air pressure can push the piston top and the piston bottom to move downwards, and under the action of the air pushing hole, the air pressure can drive the rotating block to rotate around the rotating shaft; and lubricating oil flows into the lubricating holes in the sealing block along the liquid outlet holes, so that the sealing block can be uniformly lubricated, and the sealing block is prevented from being damaged and the service life of the sealing block is prevented from being influenced due to long-time friction between the sealing block and the inner wall of the cylinder body.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, in particular to a self-lubricating sealing structure of a pneumatic actuator. Background Art

[0002] A pneumatic actuator is an actuator that uses air pressure to open, close or adjust a valve. It is also called a pneumatic actuator or pneumatic device, usually referred to as a pneumatic head. It is mainly composed of a cylinder, a piston, a gear shaft, an end cover, a seal, and screws, and may be equipped with auxiliary devices such as a valve positioner and a handwheel mechanism.

[0003] The utility model patent with the authorization announcement number CN 212960150 U discloses a pneumatic actuator, which is provided with a pressure sensor, and the pressure sensor can monitor the air pressure inside the feed port. When the pressure sensor detects that the pressure inside the device exceeds the set value, the pressure sensor will transmit this information to the controller, and the controller will control the buzzer to make a sound to remind the user. At the same time, the controller will control the cylinder to drive the piston push rod and the baffle to move outward in the same direction, so that the gas or liquid inside the feed port can be discharged from the discharge port, and the pneumatic actuator is depressurized, thereby preventing the internal structure of the device from being damaged to a certain extent, and also preventing the device from having an accident due to excessive internal pressure, so as to facilitate the protection of the device. The above-mentioned prior art scheme still has the following deficiencies: in the above-mentioned starting actuator, its piston push rod and baffle are used for long-term horizontal movement, and it is inconvenient to add lubricating oil to them, which leads to easy dryness, thereby affecting the normal starting control of the pneumatic actuator. Discharge and material blocking effect, therefore, a pneumatic actuator self-lubricating sealing structure is proposed to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of the utility model is to provide a self-lubricating sealing structure of a pneumatic actuator to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a pneumatic actuator self-lubricating sealing structure, comprising a cylinder body, a self-lubricating mechanism is arranged inside the cylinder body, and a mounting mechanism is arranged outside the cylinder body;

[0006] The self-lubricating mechanism comprises a piston top, the bottom of the piston top is rotatably connected to a rotating shaft, a rotating block is fixedly connected to the outer side of the rotating shaft, the bottom of the rotating shaft is rotatably connected to a piston bottom, and a sealing block is fixedly connected between the piston top and the piston bottom.

[0007] Preferably, the piston top is movably connected to the inside of the cylinder body, a through hole is opened inside the piston top, and the bottom of the piston bottom is fixedly connected to a piston rod extending to the bottom of the cylinder body.

[0008] Preferably, an air pushing hole is provided inside the rotating block, the number of the air pushing holes is not less than three and they are centrally symmetrically distributed, a liquid inlet hole is provided on the top of the rotating block, and a liquid outlet hole connected to the liquid inlet hole is provided on the side of the rotating block.

[0009] Through the above technical solution, the opening of the air push hole enables the rotating block to rotate around the rotating axis under the action of air pressure.

[0010] Preferably, the sealing block is designed in a circular ring shape and fits against the inner wall of the cylinder body, and a lubrication hole located at the same height as the liquid outlet is opened on the side of the sealing block, and the number of the lubrication holes is not less than three and is distributed in a centrally symmetrical manner.

[0011] Through the above technical solution, with the coordinated use of the liquid outlet hole and the lubrication hole, the lubricating oil inside the rotating block can be evenly poured into each lubrication hole, thereby achieving uniform lubrication of the sealing block.

[0012] Preferably, the mounting mechanism comprises a top cover, to which a first vent nozzle is fixedly connected, the bottom of the cylinder body is movably connected to a bottom cover, to which a second vent nozzle is fixedly connected, and the top cover and the bottom cover are movably connected to each other by a connecting rod.

[0013] Preferably, the top cover is movably placed on the top of the cylinder body, one end of the first ventilation nozzle and the second ventilation nozzle both extend into the interior of the cylinder body, and the bottom of the piston rod extends to below the bottom cover.

[0014] Preferably, the outer sides of the top cover and the bottom cover are fixedly connected with connecting blocks, the upper and lower sides of the connecting rod pass through the upper and lower connecting blocks respectively, and the upper and lower sides of the connecting rod are threadedly connected with nuts.

[0015] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0016] First, the utility model adds lubricating oil into the perforation on the top of the piston, and the lubricating oil flows into the liquid inlet hole on the rotating block through the perforation, and ventilates into the cylinder body. The air pressure will push the piston top and the piston bottom downward. Under the action of the air pushing hole, the air pressure will drive the rotating block to rotate around the rotating shaft, so that the lubricating oil flows into the multiple lubricating holes on the sealing block along the liquid outlet hole, respectively, and the sealing block can be evenly lubricated, avoiding long-term friction between the sealing block and the inner wall of the cylinder body, which will cause the sealing block to be damaged and affect its service life.

[0017] Second, the utility model passes the piston rod through the bottom cover, inserts the connecting rod into the connecting block on the bottom cover, fixes the connecting rod with a nut, then passes the connecting block of the top cover through the connecting rod, and fixes the top of the connecting rod with a nut to complete the installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0019] Figure 2 It is a cutaway schematic diagram of the cylinder body of the utility model;

[0020] Figure 3 This is an exploded view of the turning block of the utility model;

[0021] Figure 4 It is a three-dimensional schematic diagram of the sealing block of the utility model.

[0022] Among them: 1. cylinder body; 2. self-lubricating mechanism; 21. piston top; 211. perforation; 22. rotating shaft; 23. rotating block; 231. air push hole; 232. liquid inlet hole; 233. liquid outlet hole; 24. piston bottom; 25. sealing block; 251. lubrication hole; 3. mounting mechanism; 31. top cover; 32. first vent nozzle; 33. bottom cover; 34. second vent nozzle; 35. connecting rod. DETAILED DESCRIPTION

[0023] 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 in 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.

[0024] The utility model provides the following technical solutions:

[0025] Embodiment 1

[0026] See also Figure 1 , Figure 2 , Figure 3 and Figure 4A pneumatic actuator self-lubricating sealing structure includes a cylinder body 1, a self-lubricating mechanism 2 is movably connected inside the cylinder body 1, the self-lubricating mechanism 2 includes a piston top 21, the bottom of the piston top 21 is rotatably connected to a rotating shaft 22, the outer side of the rotating shaft 22 is fixedly connected to a rotating block 23, the bottom of the rotating shaft 22 is rotatably connected to a piston bottom 24, a sealing block 25 is fixedly connected between the piston top 21 and the piston bottom 24, the piston top 21 is movably connected to the inside of the cylinder body 1, a through hole 211 is opened inside the piston top 21, and the bottom of the piston bottom 24 is fixedly connected to A piston rod extending to the bottom of the cylinder body 1 is connected, an air pushing hole 231 is opened inside the rotating block 23, the number of the air pushing holes 231 is not less than three and they are symmetrically distributed in the center, a liquid inlet hole 232 is opened on the top of the rotating block 23, and a liquid outlet hole 233 connected to the liquid inlet hole 232 is opened on the side of the rotating block 23. The sealing block 25 is designed in a circular ring shape and fits with the inner wall of the cylinder body 1. A lubrication hole 251 located at the same height as the liquid outlet hole 233 is opened on the side of the sealing block 25, and the number of the lubrication holes 251 is not less than three and they are symmetrically distributed in the center.

[0027] Through the above technical solution, lubricating oil is added to the through hole 211 on the piston top 21, and the lubricating oil flows into the liquid inlet hole 232 on the rotating block 23 through the through hole 211, and ventilates into the cylinder body 1. The air pressure will push the piston top 21 and the piston bottom 24 downward. Under the action of the air push hole 231, the air pressure will drive the rotating block 23 to rotate around the rotating shaft 22, so that the lubricating oil flows into the multiple lubricating holes 251 on the sealing block 25 along the liquid outlet hole 233, respectively, so as to evenly lubricate the sealing block 25, avoid long-term friction between the sealing block 25 and the inner wall of the cylinder body 1, which will cause damage to the sealing block 25 and affect its service life.

[0028] Embodiment 2

[0029] See also Figure 1 , and on the basis of Example 1, it is further obtained that: the outer side of the cylinder body 1 is movably connected with a mounting mechanism 3, the mounting mechanism 3 includes a top cover 31, a first ventilation nozzle 32 is fixedly connected to the top cover 31, a bottom cover 33 is movably connected to the bottom of the cylinder body 1, a second ventilation nozzle 34 is fixedly connected to the bottom cover 33, the top cover 31 and the bottom cover 33 are movably connected with a connecting rod 35, the top cover 31 is movably placed on the top of the cylinder body 1, one end of the first ventilation nozzle 32 and the second ventilation nozzle 34 are extended to the inside of the cylinder body 1, the bottom of the piston rod extends to the bottom of the bottom cover 33, the outer sides of the top cover 31 and the bottom cover 33 are fixedly connected with connecting blocks, the upper and lower sides of the connecting rod 35 pass through the upper and lower connecting blocks respectively, and the upper and lower sides of the connecting rod 35 are threaded with nuts.

[0030] Through the above technical solution, the piston rod is passed through the bottom cover 33, and the connecting rod 35 is inserted into the connecting block on the bottom cover 33, and the connecting rod 35 is fixed with a nut. Then, the connecting block of the top cover 31 is passed through the connecting rod 35, and the top of the connecting rod 35 is fixed with a nut to complete the installation.

[0031] In actual operation, when this device is in use, first, the piston rod is passed through the bottom cover 33, and the connecting rod 35 is inserted into the connecting block on the bottom cover 33, and the connecting rod 35 is fixed with a nut, and lubricating oil is added to the through hole 211 on the piston top 21, and the lubricating oil flows into the liquid inlet hole 232 on the rotating block 23 through the through hole 211, and then the connecting block of the top cover 31 is passed through the connecting rod 35, and the top of the connecting rod 35 is fixed with a nut to complete the installation, and air is ventilated into the cylinder body 1 through the first ventilation nozzle 32. When air is ventilated into the cylinder body 1, the air pressure will push the piston top 21 and the piston bottom 24 downward, and under the action of the air push hole 231, the air pressure will drive the rotating block 23 to rotate around the rotating shaft 22, so that the lubricating oil flows into the multiple lubrication holes 251 on the sealing block 25 along the liquid outlet hole 233, respectively, and the sealing block 25 can be evenly lubricated.

[0032] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit thereof, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic actuator self-lubricating seal structure, comprising a cylinder body (1), characterized in that: A self-lubricating mechanism (2) is provided inside the cylinder body (1), and a mounting mechanism (3) is provided outside the cylinder body (1); The self-lubricating mechanism (2) comprises a piston top (21), the bottom of the piston top (21) is rotatably connected to a rotating shaft (22), a rotating block (23) is fixedly connected to the outer side of the rotating shaft (22), the bottom of the rotating shaft (22) is rotatably connected to a piston bottom (24), and a sealing block (25) is fixedly connected between the piston top (21) and the piston bottom (24).

2. The pneumatic actuator self-lubricating sealing structure according to claim 1, characterized in that: The piston top (21) is movably connected to the inside of the cylinder body (1), a through hole (211) is opened inside the piston top (21), and the bottom of the piston bottom (24) is fixedly connected to a piston rod extending to the bottom of the cylinder body (1).

3. The self-lubricating sealing structure of a pneumatic actuator according to claim 1, characterized in that: The rotating block (23) is provided with an air pushing hole (231) inside, the number of the air pushing holes (231) is not less than three and is centrally symmetrically distributed, the top of the rotating block (23) is provided with a liquid inlet hole (232), and the side of the rotating block (23) is provided with a liquid outlet hole (233) connected with the liquid inlet hole (232).

4. The self-lubricating sealing structure of a pneumatic actuator according to claim 1, characterized in that: The sealing block (25) is designed in a circular ring shape and fits against the inner wall of the cylinder body (1). The side of the sealing block (25) is provided with a lubrication hole (251) located at the same height as the liquid outlet hole (233). The number of the lubrication holes (251) is not less than three and is distributed in a centrally symmetrical manner.

5. The pneumatic actuator self-lubricating sealing structure according to claim 2, characterized in that: The mounting mechanism (3) comprises a top cover (31), a first vent nozzle (32) being fixedly connected to the top cover (31), a bottom cover (33) being movably connected to the bottom of the cylinder body (1), a second vent nozzle (34) being fixedly connected to the bottom cover (33), and a connecting rod (35) being movably connected between the top cover (31) and the bottom cover (33).

6. The pneumatic actuator self-lubricating seal structure according to claim 5, characterized in that: The top cover (31) is movably placed on the top of the cylinder body (1), one end of the first ventilation nozzle (32) and the second ventilation nozzle (34) both extend into the interior of the cylinder body (1), and the bottom of the piston rod extends to below the bottom cover (33).

7. The pneumatic actuator self-lubricating seal structure according to claim 5, characterized in that: The outer sides of the top cover (31) and the bottom cover (33) are fixedly connected with connecting blocks, the upper and lower sides of the connecting rod (35) pass through the upper and lower connecting blocks respectively, and the upper and lower sides of the connecting rod (35) are threadedly connected with nuts.

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