Pneumatic actuator with overload protection function

Abstract

The utility model provides a pneumatic actuator with an overload protection function, which relates to the technical field of pneumatic actuators and comprises an actuator device, the actuator device comprises a cylinder body, an air inlet pipe, an end cover, a piston rod and an air outlet pipe, and the bottom of the cylinder body is fixedly connected with the top of the end cover; according to the utility model, the overload protection device is arranged, the pressure sensor accurately captures the air pressure change in the cylinder body and transmits a signal to the controller, when the air pressure value detected by the controller exceeds a preset threshold value, the electromagnetic directional valve quickly cuts off the air path of the air inlet pipe, and meanwhile, the air escape valve is opened to quickly discharge compressed air in the cylinder body; according to the overload protection device, the output force of the piston rod is reduced, overload protection on the actuator is achieved, the air pressure in the cylinder body is monitored in real time through the high-precision pressure sensor, the overload condition can be accurately and timely detected, a protection mechanism is rapidly triggered, the actuator is prevented from being damaged due to overload, and the reliability and stability of the actuator are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic actuator technical field especially, relate to a kind of pneumatic actuator with overload protection function. BACKGROUND

[0002] Pneumatic actuator is a kind of compressed air energy conversion into mechanical energy, and drive load to carry out linear or rotational motion device, it has simple structure, work reliable, easy to maintain and so on Advantage, widely used in industrial automation field.

[0003] In prior art, such as Chinese patent CN220286586U discloses a kind of pneumatic safety actuator, including pneumatic actuator, valve and brake device of gas cut-off.The cylinder of pneumatic actuator is provided with inlet pipe, the transmission shaft of this pneumatic actuator is connected with the guide rod of valve.Brake disc of brake device of gas cut-off is arranged on the shaft body of transmission shaft, brake shoe of brake device of gas cut-off is arranged in the lower part of the casing of pneumatic actuator;Brake cylinder of brake device of gas cut-off is provided with gas pipe.

[0004] However, traditional pneumatic actuator is prone to cause internal pressure of actuator to sharply increase when encountering abnormal conditions such as excessive load or jam, thereby causing parts to be severely worn, deformed or even damaged, which seriously affects the service life of pneumatic actuator and the stability of the system.At present, although some pneumatic actuators on the market claim to have certain overload protection function, most of them have complex structure, high cost, and the protection effect is not ideal, which cannot accurately and timely protect the actuator from overload.In view of the above problems, a kind of pneumatic actuator with overload protection function is proposed. UTILITY MODEL CONTENTS

[0005] The utility model mainly provides a kind of pneumatic actuator with overload protection function, which can improve processing efficiency and prevent deviation.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: a kind of pneumatic actuator with overload protection function, including actuator device, the actuator device includes cylinder body, inlet pipe, end cover, piston rod and outlet pipe, the bottom of the cylinder body is fixedly connected with the top of end cover, the piston is movably installed in the cylinder body, one end of the piston rod is fixedly connected with the piston, and the other end of the piston rod extends out of the end cover, further including overload protection device, the overload protection device includes controller, electromagnetic reversing valve, pressure sensor and air release valve, the top end of the cylinder body is provided with inlet on one side, and the bottom end of the cylinder body is provided with outlet on one side, one end of the inlet pipe is fixedly connected with the inlet, one end of the outlet pipe is fixedly connected with the outlet, the electromagnetic reversing valve is fixedly installed at one end of the inlet pipe, the pressure sensor is fixedly installed at the connection between the inlet pipe and the inlet, and the air release valve is fixedly installed at the connection between the outlet pipe and the outlet.

[0007] Preferably, the pressure sensor and the air release valve are both signal-connected with the controller, the electromagnetic reversing valve is electrically connected with the controller, the pressure sensor is installed on the air inlet pipe close to the air inlet, and the pressure sensor is used for monitoring the air pressure change in the cylinder in real time; when the actuator device works normally, the air pressure in the cylinder is in a stable normal range; once the actuator encounters an overload condition, the air pressure in the cylinder will rapidly increase, and the pressure sensor can sensitively capture the air pressure change.

[0008] Preferably, the bottom end of the controller is fixedly connected with the outside of the cylinder, and the bottom end of the end cover is welded with a support frame; the controller receives the electric signal transmitted by the pressure sensor and compares the electric signal with a preset overload pressure threshold value; when the detected air pressure value exceeds the preset threshold value, the controller determines that the actuator is overloaded, and then sends a control instruction to the air release valve and the electromagnetic reversing valve.

[0009] Preferably, the two sides of the end cover are fixedly connected with symmetrical lip-shaped sealing rings, and the bottom of the end cover is fixedly connected with a metal bellows; the lip-shaped sealing rings are tightly combined with the outer wall of the piston rod, and can effectively block the leakage of gas from the gap between the piston rod and the end cover during the reciprocating movement of the piston rod.

[0010] Preferably, the inner wall of the metal bellows is fixedly connected with a guide ring, and the inner wall of the guide ring is fixedly connected with a sealing ring; the metal bellows has good flexibility and sealing property.

[0011] Preferably, the cross section of the metal bellows is wave-shaped, the inner wall of the sealing ring is combined with the outer wall of the piston rod, the guide ring is used for ensuring the straightness of the movement of the piston rod and reducing friction, and the sealing ring further enhances the sealing effect.

[0012] Compared with the prior art, the utility model has the advantages and positive effects that,

[0013] 1、In the utility model, through setting overload protection device, pressure sensor real time monitoring the air pressure change in the cylinder, when the actuator encounters overload condition, pressure sensor can accurately capture the air pressure change in the cylinder, and the pressure signal is converted into electric signal output and is transported to the controller, the air pressure value detected by the controller exceeds the preset threshold value, the electromagnetic reversing valve rapidly cuts off the air inlet pipe gas circuit, and simultaneously the air release valve opens, and the compressed air in the cylinder is rapidly discharged, so that the air pressure difference of both ends of the piston is rapidly reduced, the output force of the piston rod is reduced, the overload protection of the actuator is realized, the device can accurately and timely detect the occurrence of overload condition through the real time monitoring of the high-precision pressure sensor, and rapidly triggers the protection mechanism, effectively avoids the damage of the actuator due to overload, and greatly improves the reliability and stability of the actuator.

[0014] 2. The utility model discloses, through increasing the lip -shaped sealing washer, metal bellows, guide ring and sealing ring, the lip -shaped sealing washer can effectively block the gas from the clearance of piston rod and end cover leak when piston rod reciprocates, metal bellows has good flexibility and sealing, installs a group of guide ring and sealing ring by polytetrafluoroethylene material in the inside of metal bellows, through the design of multiple different types of sealing structure, all -round improves the sealing effect, effectively reduces the gas leak, improves the working efficiency and stability of actuator. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A perspective view of a pneumatic actuator with overload protection function is provided for the utility model;

[0016] Figure 2 A top view structural schematic diagram of a pneumatic actuator with overload protection function is provided for the utility model;

[0017] Figure 3 A front view sectional view of a pneumatic actuator with overload protection function is provided for the utility model;

[0018] Figure 4 A front view sectional view of a pneumatic actuator with overload protection function is provided for the utility model; Figure 3 Detail enlarged view of A in the utility model.

[0019] Legend: 1, actuator device; 2, overload protection device; 11, cylinder body; 12, inlet pipe; 13, end cover; 14, piston rod; 15, outlet pipe; 16, gas inlet; 17, gas outlet; 18, piston; 19, support frame; 110, lip -shaped sealing washer; 111, metal bellows; 112, guide ring; 113, sealing ring; 21, controller; 22, electromagnetic reversing valve; 23, pressure sensor; 24, air release valve. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above -mentioned purpose, features and advantages of the utility model, the utility model is further explained below with the help of drawings and examples.It needs to be explained that the embodiment of the application and the features in the embodiment can be combined mutually in the case where there is no conflict.

[0021] In the following description, a lot of specific details are set forth in order to facilitate a full understanding of the utility model, but the utility model can also be implemented in other ways different from the description herein, therefore, the utility model is not limited to the specific embodiment disclosed in the following disclosure.

[0022] Please refer to Figures 1-4The utility model provides a technical scheme: a pneumatic actuator with overload protection function, including actuator device 1, actuator device 1 includes cylinder body 11, air inlet pipe 12, end cover 13, piston rod 14 and air outlet pipe 15, the bottom of cylinder body 11 is fixedly connected with the top of end cover 13, piston 18 is movably installed in the inside of cylinder body 11, one end of piston rod 14 is fixedly connected with piston 18, and the other end of piston rod 14 extends out of end cover 13, still include overload protection device 2, overload protection device 2 includes controller 21, electromagnetic reversing valve 22, pressure sensor 23 and air release valve 24, the top end one side of cylinder body 11 is opened air inlet 16, and the bottom end one side of cylinder body 11 is opened air outlet 17, one end of air inlet pipe 12 is fixedly connected with air inlet 16, one end of air outlet pipe 15 is fixedly connected with air outlet 17, electromagnetic reversing valve 22 is fixedly installed at one end of air inlet pipe 12, pressure sensor 23 is fixedly installed at the junction of air inlet pipe 12 and air inlet 16, air release valve 24 is fixedly installed at the junction of air outlet pipe 15 and air outlet 17.

[0023] As Figure 1 And Figure 2 Indicated, pressure sensor 23 and air release valve 24 are connected with controller 21 signal, electromagnetic reversing valve 22 is electrically connected with controller 21, pressure sensor 23 is installed at the position of air inlet pipe 12 close to air inlet 16, pressure sensor 23 is used for real-time monitoring the air pressure change in cylinder body 11, when actuator device 1 normally works, the air pressure in cylinder body 11 is in the normal range of stable, once the actuator encounters overload condition, the air pressure in cylinder body 11 can rapidly rise, and pressure sensor 23 can acutely capture this air pressure change.

[0024] As Figure 2 And Figure 3 Indicated, the bottom of controller 21 is fixedly connected with the outside of cylinder body 11, the bottom of end cover 13 is welded support frame 19, controller 21 receives the electric signal delivered by pressure sensor 23 and compares it with the preset overload pressure threshold value, when the detected air pressure value exceeds the preset threshold value, controller 21 determines that the actuator is overloaded, and immediately sends control instructions to air release valve 24 and electromagnetic reversing valve 22.

[0025] As Figure 4 Indicated, the both sides of end cover 13 are fixedly connected with lip seal ring 110, the bottom of end cover 13 is fixedly connected with metal bellows 111, lip seal ring 110 is lip-shaped structure, and the lip of lip seal ring 110 is respectively towards the front and rear sides of the movement direction of piston rod 14, and lip seal ring 110 is tightly combined with the outer wall of piston rod 14, can effectively block the leakage of gas from the gap between piston rod 14 and end cover 13 when piston rod 14 reciprocates.

[0026] As Figure 4As shown, the inner wall of the metal bellows 111 is fixedly connected with the guide ring 112, and the inner wall of the guide ring 112 is fixedly connected with the sealing ring 113. The metal bellows 111 has good flexibility and sealing performance.

[0027] As shown in Figure 3 and Figure 4 The cross section of the metal bellows 111 is wavy, the inner wall of the sealing ring 113 is in close contact with the outer wall of the piston rod 14, the guide ring 112 is used to ensure the straightness of the movement of the piston rod 14 and reduce friction, and the sealing ring 113 further enhances the sealing effect.

[0028] The use method and working principle of the device are as follows: the overload protection device 2 is added outside the actuator device 1, the overload protection device 2 is composed of a controller 21, an electromagnetic reversing valve 22, a pressure sensor 23 and a gas release valve 24, the pressure sensor 23 is installed at a position close to the air inlet 16 of the air inlet pipe 12, the gas release valve 24 is installed at a position close to the air outlet 17 of the air outlet pipe 15, and the electromagnetic reversing valve 22 is installed on the air inlet pipe 12 between the air inlet 16 and the cylinder body 11;

[0029] The pressure sensor 23 monitors the pressure change in the cylinder body 11 in real time. When the actuator device 1 works normally, the pressure in the cylinder body 11 is in a stable normal range. Once the actuator encounters an overload condition, the pressure in the cylinder body 11 will rapidly increase. The pressure sensor 23 can sensitively capture this pressure change, convert the pressure signal into an electric signal and output and deliver it to the controller 21. The controller 21 receives the electric signal and compares it with the preset overload pressure threshold value. When the detected pressure value exceeds the preset threshold value, the controller 21 determines that the actuator is overloaded, and immediately sends a control instruction to the gas release valve 24 and the electromagnetic reversing valve 22. The electromagnetic reversing valve 22 quickly acts to cut off the air path of the air inlet pipe 12 between the air inlet 16 and the cylinder body 11, preventing compressed air from continuing to enter the cylinder body 11. At the same time, the gas release valve 24 is opened to rapidly discharge the compressed air in the cylinder body 11, so that the pressure difference between the two ends of the piston 18 is rapidly reduced, thereby reducing the output force of the piston rod 14 and achieving overload protection of the actuator. The device can accurately and timely detect the occurrence of an overload condition by monitoring the pressure in the cylinder body 11 through a high-precision pressure sensor 23, and quickly trigger the protection mechanism, effectively avoiding damage to the actuator due to overload, greatly improving the reliability and stability of the actuator. At the same time, the components of the overload protection device 2 have relatively simple structures and are easy to manufacture and install, which will not make the overall structure of the pneumatic actuator too complex, thereby reducing the manufacturing cost and maintenance difficulty.

[0030] Through increasing the lip-shaped sealing ring 110, the metal bellows 111, the guide ring 112 and the sealing ring 113, the lip-shaped sealing ring 110 is in a lip-shaped structure, the lips of which are respectively towards the front and back sides of the moving direction of the piston rod 14, the lip-shaped sealing ring 110 is tightly combined with the outer wall of the piston rod 14, can effectively block the gas from leaking from the gap between the piston rod 14 and the end cover 13 when the piston rod 14 reciprocates, and can also prevent external impurities from entering, can automatically enhance the sealing effect under the action of high-pressure gas, the metal bellows 111 has good flexibility and sealing property, a group of the guide ring 112 and the sealing ring 113 made of polytetrafluoroethylene material are installed inside the metal bellows 111, the guide ring 112 is used for ensuring the straightness of the movement of the piston rod 14 and reducing friction, and the sealing ring 113 further enhances the sealing effect; through the design of various types of sealing structures, the sealing effect is improved in all directions, the gas leakage is effectively reduced, the working efficiency and stability of the actuator are improved, the service life of each component of the actuator is prolonged, and the maintenance and replacement cost of the equipment is reduced.

[0031] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments still belong to the protection scope of the present application technical scheme.

Claims

1. A pneumatic actuator with overload protection function, comprising an actuator device (1), the actuator device (1) comprising a cylinder body (11), an air inlet pipe (12), an end cover (13), a piston rod (14) and an air outlet pipe (15), the bottom of the cylinder body (11) is fixedly connected with the top of the end cover (13), a piston (18) is movably installed inside the cylinder body (11), one end of the piston rod (14) is fixedly connected with the piston (18), and the other end of the piston rod (14) extends out of the end cover (13), characterized in that, Also include overload protection device (2), the overload protection device (2) include controller (21), electromagnetic reversing valve (22), pressure sensor (23) and air release valve (24), the top end side of the cylinder (11) is provided with air inlet (16), and the bottom end side of the cylinder (11) is provided with air outlet (17), one end of the air inlet pipe (12) is fixedly connected with air inlet (16), one end of the air outlet pipe (15) is fixedly connected with air outlet (17), the electromagnetic reversing valve (22) is fixedly installed in one end of air inlet pipe (12), the pressure sensor (23) is fixedly installed at the joint of air inlet pipe (12) and air inlet (16), the air release valve (24) is fixedly installed at the joint of air outlet pipe (15) and air outlet (17).

2. The pneumatic actuator with overload protection function according to claim 1, characterized in that: The pressure sensor (23) and air release valve (24) are signal connected with the controller (21), and the electromagnetic reversing valve (22) is electrically connected with the controller (21).

3. The pneumatic actuator with overload protection function according to claim 1, characterized in that: The bottom end of the controller (21) is fixedly connected with the outside of the cylinder (11), and the bottom end of the end cover (13) is welded with a support frame (19).

4. The pneumatic actuator with overload protection function according to claim 1, characterized in that: The two sides of the end cover (13) are fixedly connected with lip-shaped sealing rings (110) in a symmetrical manner, and the bottom of the end cover (13) is fixedly connected with a metal bellows (111).

5. The pneumatic actuator with overload protection function according to claim 4, characterized in that: The inner wall of the metal bellows (111) is fixedly connected with a guide ring (112), and the inner wall of the guide ring (112) is fixedly connected with a sealing ring (113).

6. The pneumatic actuator with overload protection function according to claim 5, characterized in that: The cross section of the metal bellows (111) is wave-shaped, and the inner wall of the sealing ring (113) is in close contact with the outer wall of the piston rod (14).

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