Double-cylinder pneumatic actuator

Abstract

The double-cylinder pneumatic actuator comprises an air cylinder assembly, the air cylinder assembly comprises a cylinder body and an execution piece which are coaxially arranged, the execution piece is arranged in an inner cavity of the cylinder body, the cylinder body is provided with an air port communicated with the inner cavity of the cylinder body, and air is inflated into the inner cavity of the cylinder body through the air port so as to push the execution piece to move in a reciprocating mode in the axis direction of the execution piece. A positioning groove is formed in the bottom of the cylinder body in the axis direction of the cylinder body. And the support assembly is fixedly connected with the cylinder body and comprises a positioning table and a positioning hole which are coaxially arranged, the positioning table is matched with the positioning groove and used for positioning the cylinder body so that the cylinder body and the support assembly can be coaxially arranged, and the positioning hole is used for positioning the valve so that the valve and the execution piece can be coaxially arranged. According to the utility model, the output pulling force of the execution piece can be selected as double-piston acting pulling force and single-piston acting pulling force according to requirements, and the output pushing force of the execution piece can be selected as double-piston acting pushing force and single-piston acting pushing force, so that the functions are richer, the positioning precision is higher, and the eccentric wear risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of actuator technology, and in particular to a dual-cylinder pneumatic actuator. Background Technology

[0002] Pneumatic actuators, as one of the most commonly used drive devices, are widely used in valves and other terminal actuators to drive valves to open or close. Currently, pneumatic valves on the market often use single-cylinder pneumatic actuators as their pneumatic actuators. Single-cylinder pneumatic actuators have advantages such as simple structure, stable output, and economic and environmental friendliness. However, single-cylinder pneumatic actuators rely on the action of a single piston to output pulling or pushing force, and cannot change the magnitude of the output pulling or pushing force according to needs, resulting in a limited functional setting. Furthermore, single-cylinder pneumatic actuators also have problems such as large structure and low coaxial positioning accuracy during installation, which reduces the service life of the pneumatic actuator. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a dual-cylinder pneumatic actuator that allows selection of the actuator output pull force as dual-piston pull force or single-piston pull force, and selection of the actuator output thrust force as dual-piston thrust or single-piston thrust force, thus providing richer functions. Furthermore, the piston rod and valve have high coaxial positioning accuracy during installation, reducing the risk of uneven wear and extending service life.

[0004] This utility model provides a dual-cylinder pneumatic actuator, comprising:

[0005] A cylinder assembly includes a cylinder body and an actuator arranged coaxially. The actuator is disposed in the inner cavity of the cylinder body, and one end of the actuator extends out of the cylinder body for connection with a valve. The cylinder body has an air port communicating with its inner cavity. Gas is introduced into the inner cavity of the cylinder body through the air port to push the actuator to reciprocate along its own axis. The bottom of the cylinder body is provided with a positioning groove along its axis.

[0006] The bracket assembly, fixedly connected to the cylinder body, includes a positioning platform and a positioning hole arranged coaxially. The positioning platform matches the positioning groove and is used to position the cylinder body so that the cylinder body and the bracket assembly are arranged coaxially. The positioning hole is used to position the valve so that the valve and the actuator are arranged coaxially.

[0007] Furthermore, the cylinder body includes an upper cylinder barrel, a lower cylinder barrel, an upper cylinder head, a lower cylinder head, and a partition plate. The upper cylinder head is sealed at the top of the upper cylinder barrel, and the lower cylinder head is sealed at the bottom of the lower cylinder barrel. The lower cylinder barrel is located directly below the upper cylinder barrel, and the upper cylinder barrel and the lower cylinder barrel are sealed and isolated by the partition plate, so that an upper cylinder cavity is formed inside the upper cylinder barrel and a lower cylinder cavity is formed inside the lower cylinder barrel.

[0008] Furthermore, the actuator includes an upper piston plate, a lower piston plate, and a piston rod. The upper piston plate is slidably disposed in the inner cavity of the upper cylinder to seal and form an upper cylinder upper cavity and an upper cylinder lower cavity. The lower piston plate is slidably disposed in the inner cavity of the lower cylinder to seal and form a lower cylinder upper cavity and a lower cylinder lower cavity. The piston rod includes a first rod body and a second rod body that are coaxially and fixedly connected. The two ends of the first rod body are fixedly connected to the upper piston plate and the lower piston plate, respectively. The end of the second rod body away from the first rod body extends out of the cylinder body.

[0009] Furthermore, the air port includes an upper air port, a first intermediate air port, a second intermediate air port, and a lower air port. The upper air port is opened on the upper cylinder head and communicates with the upper chamber of the upper cylinder. The first intermediate air port is opened on the partition and communicates with the lower chamber of the upper cylinder. The second intermediate air port is opened on the partition and communicates with the upper chamber of the lower cylinder. The lower air port is opened on the lower cylinder head and communicates with the lower chamber of the lower cylinder.

[0010] Both the upper air port and the lower air port are used to connect to an external inflation / deflation mechanism. The first middle air port is used to communicate with the lower air port or with the external atmosphere. The second middle air port is used to seal or communicate with the external atmosphere.

[0011] When air enters through the lower air inlet and the first middle air inlet is connected to the lower air inlet, the actuator outputs a double-piston pulling force, causing the piston rod to move upward along its axial direction.

[0012] When air enters through the lower air inlet and the first middle air inlet is connected to the external atmosphere, the actuator outputs a single-piston pulling force, causing the piston rod to move upward along its axial direction.

[0013] Furthermore, the first rod body is provided with an air guide channel, one end of which is connected to the upper cavity of the lower cylinder, and the other end is provided with a threaded opening. A sealing element is detachably connected to the threaded opening to allow the air guide channel to be connected to or not connected to the upper cavity of the upper cylinder.

[0014] When air enters through the upper air inlet, the second middle air inlet is sealed, and the air guide channel is connected to the upper chamber of the upper cylinder, the actuator outputs a double-piston thrust, causing the piston rod to move downward along its axial direction.

[0015] When air enters through the upper air inlet, the second middle air inlet is connected to the external atmosphere, and the air guide channel is not connected to the upper chamber of the upper cylinder, the actuator outputs a single-piston thrust, causing the piston rod to move downward along its axial direction.

[0016] Furthermore, the air guide channel includes an axial air guide channel and multiple transverse air guide channels. The axial air guide channel is opened in the first rod body along the axis of the first rod body. The multiple transverse air guide channels are evenly opened in the first rod body along the circumference of the first rod body. One end of the axial air guide channel is located in the upper cavity of the upper cylinder and is provided with the threaded opening. The other end is located in the upper cavity of the lower cylinder and communicates with the multiple transverse air guide channels. A guide sleeve is also rotatably sleeved on the outer wall of the first rod body. The guide sleeve is evenly opened with multiple transverse through holes communicating with the upper cavity of the lower cylinder along its circumference. The multiple transverse through holes correspond one-to-one with the multiple transverse air guide channels and communicate with them.

[0017] Furthermore, an upper sealing ring is fitted on the outer circumference of the upper piston plate, and a lower sealing ring is fitted on the outer circumference of the lower piston plate. The upper sealing ring abuts against the inner wall of the upper cylinder, and the lower sealing ring abuts against the inner wall of the lower cylinder.

[0018] Furthermore, the bracket assembly includes an upper bracket flange and a lower bracket flange that are coaxially and fixedly connected. The upper bracket flange is fixedly connected to the lower cylinder head, and the top of the upper bracket flange is provided with the positioning platform protruding along its axial direction. The center of the lower bracket flange is provided with the positioning hole along its axial direction, and the bottom of the lower cylinder head is provided with the positioning groove recessed along its axial direction. The positioning platform, the positioning hole, and the positioning groove are coaxially arranged.

[0019] Furthermore, a connector for connecting to the valve stem is fixedly provided at the end of the second rod away from the first rod.

[0020] Furthermore, the connector is provided with a position sensing frustum, and the bracket assembly is provided with position detectors that are adapted to the position sensing frustum at intervals on the top and bottom.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] (1) The cylinder assembly of this utility model includes a cylinder body and an actuator arranged coaxially. The bracket assembly includes a positioning platform and a positioning hole arranged coaxially. A positioning groove is provided on the cylinder body along its axial direction. The positioning groove matches the positioning platform. When installing the cylinder assembly, the positioning platform is inserted into the positioning groove to position the cylinder body, so that the cylinder body and the bracket assembly are coaxially arranged and fixedly connected. The positioning hole is coaxially arranged with the positioning platform. When connecting with the valve, the valve body is fitted into the positioning hole and fixed, so that the valve is also coaxially arranged with the bracket assembly, so that the valve stem and the actuator are coaxially arranged and connected. This application can quickly position the cylinder assembly and the valve by setting the positioning groove, positioning platform and positioning port, so that the valve and the actuator are coaxially arranged, improving the accuracy of coaxial positioning when the actuator and the valve are connected, reducing the risk of uneven wear, and thus improving the service life.

[0023] (2) The cylinder body of this utility model is provided with an upper air port, a first intermediate air port, a second intermediate air port and a lower air port. The upper air port is connected to the upper chamber of the upper cylinder, the first intermediate air port is connected to the lower chamber of the upper cylinder, the second intermediate air port is connected to the upper chamber of the lower cylinder, and the lower air port is connected to the lower chamber of the lower cylinder. By connecting the first intermediate air port and the lower air port, the output pulling force of the actuator can be a double piston pulling force. By connecting the first intermediate air port to the external atmosphere, the output pulling force of the actuator can be a single piston pulling force, which increases the selectivity of the output pulling force. In addition, the first rod body of the piston rod has an air guide channel, one end of which is connected to the upper chamber of the lower cylinder. One end is open, and the other end has a threaded opening. When the threaded opening is not sealed by the sealing plug and the second intermediate air port is blocked, the upper chamber of the upper cylinder is connected to the upper chamber of the lower cylinder, and the output thrust of the actuator is a double-piston thrust. When the threaded opening is sealed and the second intermediate air port is connected to the outside atmosphere, the upper chamber of the upper cylinder is not connected to the upper chamber of the lower cylinder, and the output thrust of the actuator is a single-piston thrust, which increases the selectivity of the output thrust. The dual-cylinder pneumatic actuator of this application has a simple and compact structure, and the output thrust and output pull of the actuator can be selected according to the requirements, which is more functional than the single-cylinder pneumatic actuator.

[0024] It should be understood that the description in this utility model description section is not intended to limit the key or essential features of the embodiments of this utility model, nor is it intended to restrict the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0025] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 for Figure 1A magnified view of a portion of the image;

[0028] Figure 3 This is a front view of the connector in this utility model.

[0029] Figure 4 This is a top view of the connector in this utility model.

[0030] Figure 5 This is a schematic diagram of the assembly structure of the piston rod, valve rod, and connector in this utility model;

[0031] The following are the labels in the diagram: 1. Cylinder assembly; 2. Bracket assembly; 3. Connector; 4. Position detector; 5. Valve stem;

[0032] 11. Cylinder block; 12. Actuator; 13. Air port;

[0033] 21. Upper support flange; 22. Lower support flange;

[0034] 31. Screw; 32. Position sensing frustum;

[0035] 111. Upper cylinder head; 112. Lower cylinder head; 113. Upper cylinder head; 114. Lower cylinder head; 115. Partition plate;

[0036] 121. Upper piston plate; 122. Lower piston plate; 123. Piston rod; 124. Guide sleeve;

[0037] 131. Upper air inlet; 132. First middle air inlet; 133. Second middle air inlet; 134. Lower air inlet;

[0038] 1211. Install the upper sealing ring;

[0039] 1221. Lower sealing ring;

[0040] 1231, First rod; 1232, Second rod;

[0041] 21-1. Positioning platform;

[0042] 22-1, Positioning hole;

[0043] 124-1, Transverse through hole;

[0044] 1231-1, Axial air guide channel; 1231-2, Transverse air guide channel; 1231-3, Threaded opening. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0046] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] Please refer to Figures 1-5 An embodiment of this utility model provides a dual-cylinder pneumatic actuator, comprising:

[0048] The cylinder assembly 1 includes a cylinder body 11 and an actuator 12 coaxially arranged. The actuator 12 is disposed in the inner cavity of the cylinder body 11, and one end of the actuator 12 extends out of the cylinder body 11 for connection with a valve. The cylinder body 11 has an air port 13 communicating with its inner cavity. Gas is injected into the inner cavity of the cylinder body 11 through the air port 13 to push the actuator 12 to reciprocate along its own axis. The bottom of the cylinder body 11 is provided with a positioning groove along its axis.

[0049] The bracket assembly 2 is fixedly connected to the cylinder body 11 and includes a positioning platform 21-1 and a positioning hole 22-1 arranged coaxially. The positioning platform 21-1 matches the positioning groove and is used to position the cylinder body 11 so that the cylinder body 11 and the bracket assembly 2 are arranged coaxially. The positioning hole 22-1 is used to position the valve so that the valve and the actuator 12 are arranged coaxially.

[0050] Specifically, the air port 13 is connected to an external air filling and exhaust mechanism. By inputting gas into the inner cavity of the cylinder 11 through the air port 13, the actuator 12 can be pushed to move along its own axis. One end of the actuator 12 extends to the outside of the cylinder 11 and is connected to an external equipment valve. When the actuator 12 reciprocates, it drives the valve stem 5 of the valve to move synchronously, thereby realizing the opening and closing control of the valve.

[0051] Specifically, the bracket assembly 2 is a U-shaped cast steel part. The upper end of the bracket assembly 2 has a mounting hole for connecting with the cylinder body 11. The cylinder body 11 has screw holes, and the bracket assembly 2 and the cylinder body 11 are fixedly connected by screws. The positioning platform 21-1 on the bracket assembly 2 is cylindrical, and the positioning groove at the bottom of the cylinder body 11 is a cylindrical receiving groove. When installing the cylinder assembly 1, aligning the positioning platform 21-1 with the positioning groove and inserting the positioning platform 21-1 into the positioning groove quickly positions the cylinder body 11, making the cylinder body 11 coaxial with the bracket assembly 2. Subsequently... Screws are used to fix the bracket assembly 2 to the cylinder body 11, improving the coaxial positioning accuracy of the cylinder body 11 and the bracket assembly 2 during installation. A positioning hole 22-1 is opened at the center of the lower end of the bracket assembly 2. The positioning hole 22-1 is set as a round hole structure. When the bracket assembly 2 is connected to the valve, the valve body 5 is fitted into the positioning hole 22-1 and fixed, so that the valve and the bracket assembly 2 are set coaxially. This makes the valve stem 5 of the valve and the actuator 12 coaxially set and connected, improving the coaxial positioning accuracy of the actuator 12 when connected to the valve, reducing the risk of uneven wear, and increasing service life.

[0052] In a preferred embodiment, such as Figure 1 As shown, the cylinder body 11 includes an upper cylinder barrel 111, a lower cylinder barrel 112, an upper cylinder head 113, a lower cylinder head 114, and a partition 115. The upper cylinder barrel 111 is sealed with the upper cylinder head 113 at its top end, and the lower cylinder barrel 112 is sealed with the lower cylinder head 113 at its bottom end. The lower cylinder barrel 112 is located directly below the upper cylinder barrel 111, and the upper cylinder barrel 111 and the lower cylinder barrel 112 are sealed and isolated by the partition 115, so that an upper cylinder cavity is formed inside the upper cylinder barrel 111 and a lower cylinder cavity is formed inside the lower cylinder barrel 112.

[0053] Specifically, both the upper cylinder 111 and the lower cylinder 112 are cylindrical structures with open ends. Both the upper cylinder head 113 and the lower cylinder head 114 are frustum-shaped structures, with the end of the upper cylinder head 113 near the upper cylinder 111 and the end of the lower cylinder head 114 near the lower cylinder 112 both frustum-shaped. A sealing groove is provided in the center of the outer wall of the frustum-shaped structure, and an O-ring is fitted inside the sealing groove. The O-ring makes sealing contact with the inner wall of the upper cylinder 111 or the lower cylinder 112. The partition 115 is a disc-shaped structure, with two parallel sealing grooves on the outer wall of the partition 115. O-rings are also fitted inside the sealing grooves, with one set of O-rings contacting the upper cylinder. The bottom inner wall of cylinder 111 is in sealed contact, and another set of O-rings is in sealed contact with the top inner wall of cylinder 112. Screw mounting holes are provided on the upper cylinder head 113, lower cylinder head 114, and partition 115. The upper cylinder head 113 is fixed to the top of the upper cylinder 111, the lower cylinder head 112 is fixed to the bottom of the lower cylinder 112, and the partition 115 is fixed between the upper cylinder 111 and the lower cylinder 112. The upper cylinder 111, lower cylinder 112, upper cylinder head 113, lower cylinder head 114, and partition 115 form a whole, so that the interior of the upper cylinder 111 is sealed to form the upper cylinder cavity, and the interior of the lower cylinder 112 is sealed to form the lower cylinder cavity.

[0054] In a preferred embodiment, such as Figure 1 As shown, the actuator 12 includes an upper piston plate 121, a lower piston plate 122, and a piston rod 123. The upper piston plate 121 is slidably disposed in the inner cavity of the upper cylinder to seal and form an upper cylinder upper cavity and an upper cylinder lower cavity. The lower piston plate 122 is slidably disposed in the inner cavity of the lower cylinder to seal and form a lower cylinder upper cavity and a lower cylinder lower cavity. The piston rod 123 includes a first rod body 1231 and a second rod body 1232 that are coaxially and fixedly connected. The two ends of the first rod body 1231 are fixedly connected to the upper piston plate 121 and the lower piston plate 122, respectively. The end of the second rod body 1232 away from the first rod body 1231 extends to the outside of the cylinder body 11.

[0055] Specifically, both the upper piston plate 121 and the lower piston plate 122 are disc-shaped structures with a through hole in the middle. The first rod 1231 of the piston rod 123 is inserted into the through hole of the upper piston plate 121 and the lower piston plate 122. The top end of the piston rod 123 is provided with a thread. The top of the upper piston plate 121 is rotatably provided with a locking nut. The piston rod 123 is fixedly connected to the upper piston plate 121 by the locking nut. The piston rod 123 is fixedly connected to the lower piston plate 122 by bolts. The upper piston plate 121 and the lower piston plate 122 serve as driving components and can drive the piston rod 123 to reciprocate along its axial direction.

[0056] Preferably, an upper sealing ring 1211 is fitted on the outer circumference of the upper piston plate 121, and a lower sealing ring 1221 is fitted on the outer circumference of the lower piston plate 122. The upper sealing ring 1211 abuts against the inner wall of the upper cylinder 121, and the lower sealing ring 1221 abuts against the inner wall of the lower cylinder 122. Specifically, O-rings are used to seal between the upper piston plate 121 and the first rod 1231 of the piston rod 123, and between the lower piston plate 122 and the first rod 1231 of the piston rod 123. This ensures that the upper piston plate 121 seals the upper cylinder cavity to form two chambers: the upper chamber and the lower chamber, and the lower piston plate 122 seals the lower cylinder cavity to form two chambers: the upper chamber and the lower chamber.

[0057] In a preferred embodiment, such as Figure 1 As shown, the air port 13 includes an upper air port 131, a first intermediate air port 132, a second intermediate air port 133, and a lower air port 134. The upper air port 131 is opened on the upper cylinder head 113 and communicates with the upper chamber of the upper cylinder. The first intermediate air port 132 is opened on the partition 115 and communicates with the lower chamber of the upper cylinder. The second intermediate air port 133 is opened on the partition 115 and communicates with the upper chamber of the lower cylinder. The lower air port 134 is opened on the lower cylinder head 134 and communicates with the lower chamber of the lower cylinder.

[0058] Both the upper air port 131 and the lower air port 134 are used to connect with the external inflation and deflation mechanism. The first middle air port 132 is used to connect with the lower air port 134 or to connect with the external atmosphere. The second middle air port 133 is used to seal or connect with the external atmosphere.

[0059] When air enters through the lower air port 134 and the first middle air port 132 is connected to the lower air port 134, the actuator 12 outputs a pulling force that is a double piston pulling force, causing the piston rod 123 to move upward along its axial direction.

[0060] When air enters through the lower air inlet 134 and the first intermediate air inlet 132 is connected to the external atmosphere, the actuator 12 outputs a single-piston pulling force, causing the piston rod 123 to move upward along its axial direction.

[0061] Specifically, the upper air port 131 includes a horizontal air port and a vertical air port that are interconnected. The horizontal air port is connected to an external charging / discharging mechanism, and the vertical air port is connected to the upper chamber of the upper cylinder. The first intermediate air port 132 also includes a horizontal air port and a vertical air port. The horizontal air port is connected to the external atmosphere, and the vertical air port is connected to the lower chamber of the upper cylinder. The second intermediate air port 133 also includes a horizontal air port and a vertical air port. The horizontal air port is connected to the external atmosphere, and the vertical air port is connected to the upper chamber of the lower cylinder. The lower air port 134 also includes a horizontal air port and a vertical air port. The upper air port 131 is connected to the external air filling and exhaust mechanism, and the vertical air port is connected to the lower chamber of the lower cylinder. The upper air port 131 and the lower air port 134 are each connected to a set of external air filling and exhaust mechanisms (the external air filling and exhaust mechanisms are connected to the control system, and the air filling or exhaust operation is realized through the control system). When air is filled through the upper air port 131, air is exhausted through the lower air port 134, and the actuator 12 outputs thrust to open or close the valve. When air is filled through the lower air port 134, air is exhausted through the upper air port 131, and the actuator 12 outputs pull force to close or open the valve.

[0062] The first gas inlet 132 of this application can be connected to the external atmosphere or to the lower gas inlet 134. When the first gas inlet 132 is connected to the lower gas inlet 134, the lower chamber of the lower cylinder and the lower chamber of the upper cylinder are connected. When gas is charged through the lower gas inlet 134, the compressed gas enters the lower chamber of the lower cylinder and the lower chamber of the upper cylinder, and the control air pressure acts on the lower piston plate 122 and the upper piston plate 121, pushing the piston rod 123 to move upward. At this time, the pulling force output by the actuator 12 is a double piston pulling force, achieving double pulling force output, and the pulling force is greater. When the first gas inlet 132 is connected to the external atmosphere, gas is charged through the lower gas inlet 134, and the compressed gas enters the lower chamber of the lower cylinder. The control air pressure acts on the lower piston plate 122, pushing the piston plate 123 to move upward. However, the lower chamber of the upper cylinder is connected to the external atmosphere, and the pressure in the lower chamber of the upper cylinder is the same as the external atmospheric pressure. The upper piston plate 121 is not subjected to the upward thrust. Therefore, at this time, the pulling force output by the actuator 12 is a single piston pulling force, and the pulling force is smaller.

[0063] This application changes the connection of the first intermediate air port 132, thereby altering the output pulling force of the actuator 12. The output pulling force can be either a dual-piston pulling force or a single-piston pulling force. In actual use, if a smaller pulling force is required, the first intermediate air port 132 is connected to the external atmosphere; if a larger pulling force is required, the first intermediate air port 132 is connected to the lower air port 134 via a pipeline. The choice can be made according to actual needs. Compared to a single-cylinder pneumatic actuator, this application enriches the functionality of the pneumatic actuator.

[0064] In a preferred embodiment, such as Figure 1As shown, the first rod body 1231 has an air guide channel. One end of the air guide channel is connected to the upper chamber of the lower cylinder, and the other end is provided with a threaded port 1231-3. A sealing element is detachably connected to the threaded port 1231-3 to allow the air guide channel to be connected to or not connected to the upper chamber of the upper cylinder.

[0065] When air enters through the upper air port 131, the second middle air port 133 is sealed, and the air guide channel is connected to the upper chamber of the upper cylinder, the actuator 12 outputs a thrust force that is a double piston thrust force, causing the piston rod 123 to move downward along its axial direction.

[0066] When air is introduced through the upper air inlet 131, the second middle air inlet 133 is connected to the external atmosphere, and the air guide channel is not connected to the upper chamber of the upper cylinder, the actuator 12 outputs a single-piston thrust, causing the piston rod 123 to move downward along its axial direction.

[0067] Preferably, the air guide channel includes an axial air guide channel 1231-1 and multiple transverse air guide channels 1231-2. The axial air guide channel 1231-1 is opened in the first rod 1231 along the axis of the first rod 1231. The multiple transverse air guide channels 1231-2 are evenly opened in the first rod 1231 along the circumference of the first rod 1231. One end of the axial air guide channel 1231-1 is located in the upper cavity of the upper cylinder and is provided with a threaded port 1231-3. The other end is located in the upper cavity of the lower cylinder and communicates with the multiple transverse air guide channels 1231-2. A guide sleeve 124 is also rotatably sleeved on the outer wall of the first rod 1231. Multiple transverse through holes 124-1 communicating with the upper cavity of the lower cylinder are evenly opened in the circumference of the guide sleeve 124. The multiple transverse through holes 124-1 correspond one-to-one with the multiple transverse air guide channels 1231-2 and are connected.

[0068] Specifically, the guide sleeve 124 is a cylindrical structure with openings at both ends, fixedly fitted onto the outer wall of the first rod 1231. Multiple transverse through holes 124-1 are evenly distributed around the bottom of the guide sleeve 124. One end of each transverse through hole 124-1 communicates with the upper cavity of the lower cylinder, and the other end communicates with the transverse air guide channel 1231-2. Therefore, when the end of the axial air guide channel 1231-1 located within the upper cavity of the upper cylinder communicates with the upper cavity of the upper cylinder, the upper cavity of the upper cylinder and the upper cavity of the lower cylinder are connected. At this time, the second intermediate air port 133 is sealed using a sealing element (e.g., by using a sealing plug threadedly connected to the second intermediate air port 133), thus connecting the upper cavity of the upper cylinder and the upper cavity of the lower cylinder into a sealed cavity. Gas is then introduced through the upper air port 131, and compressed gas enters the upper cavity of the upper cylinder and the upper cavity of the lower cylinder. The control air pressure acts on the upper piston plate 121 and the lower piston plate 122, pushing the piston rod 123 downward. At this time, the thrust output by the actuator 12 is a double piston thrust, achieving double thrust output and greater thrust. When the end of the axial guide air passage 1231-1 located in the upper cylinder upper chamber is blocked, that is, when the threaded port 1231-3 is blocked by the sealing plug, the upper cylinder upper chamber and the lower cylinder upper chamber are not connected. At this time, the second middle air port 133 is connected to the outside atmosphere, and gas is filled through the upper air port 131. The compressed gas enters the upper cylinder upper chamber, and the control air pressure acts on the upper piston plate 121 to push the piston rod 123 downward. However, no compressed gas enters the lower cylinder upper chamber and does not generate thrust on the piston rod 123. At this time, the thrust output by the actuator 12 is a single piston thrust, and the thrust is smaller.

[0069] This application provides an air guide channel on the first rod body, which is connected to the sealing plug through a pre-set threaded port 1231-3. This allows the air guide channel to be opened or blocked, thereby connecting or disconnecting the upper chamber of the upper cylinder from the upper chamber of the lower cylinder. This changes the output thrust of the actuator 12, making it a double-piston thrust or a single-piston thrust. In actual use, if a smaller thrust is required, the end of the air guide channel is blocked during assembly, so that the upper chamber of the upper cylinder is not connected to the upper chamber of the lower cylinder. If a larger thrust is required, the upper chamber of the upper cylinder is connected to the upper chamber of the lower cylinder during assembly. The choice can be made according to actual needs. Compared with a single-cylinder pneumatic actuator, this application enriches the functions of the pneumatic actuator.

[0070] In a preferred embodiment, such as Figure 1 As shown, the bracket assembly 2 includes an upper bracket flange 21 and a lower bracket flange 22 that are coaxial and fixedly connected. The upper bracket flange 21 is fixedly connected to the lower cylinder head 114, and a positioning platform 21-1 is provided on the top of the upper bracket flange 21 along its axial direction. A positioning hole 22-1 is provided at the center of the lower bracket flange 22 along its axial direction. A positioning groove is provided at the bottom of the lower cylinder head 114 along its axial direction. The positioning platform 21-1, the positioning hole 22-1 and the positioning groove are coaxially arranged.

[0071] Specifically, both the upper support flange 21 and the lower support flange 22 are square plate frustum-shaped structures, and are fixedly connected by studs and nuts. A positioning platform 21-1 protrudes from the center top of the upper support flange 21. The positioning platform 21-1 is cylindrical and matches the positioning groove at the bottom of the lower cylinder head 114. Inserting the positioning platform 21-1 into the positioning groove allows for quick positioning of the cylinder assembly 1, improving the coaxial positioning accuracy of the installation. Furthermore, the upper support flange 21... The valve body is also provided with a through hole for the second rod 1232 of the piston rod 123 to pass through. The lower support flange 21 has a positioning hole 22-1 in the center. The positioning hole 22-1 is coaxial with the through hole. The valve body is fixed in the positioning hole 22-1. The valve stem 5 is coaxial with the valve body. The valve stem 5 is connected to the second rod 1232, so that the valve stem 5 and the second rod 1232 are coaxial, thereby improving the coaxial positioning accuracy when the valve stem 5 is connected to the piston rod 123 and reducing the risk of uneven wear.

[0072] In a preferred embodiment, such as Figure 3 , Figure 4 and Figure 5 As shown, a connector 3 for connecting to the valve stem 5 of the valve is fixedly provided at the end of the second rod 1232 away from the first rod 1231.

[0073] Specifically, connector 3 has a disc-shaped structure, and a stepped hole is provided in the center of connector 3. Connector 3 is divided into two semicircles from the center. One semicircle has symmetrical mounting holes for screw insertion, and the other semicircle has threaded holes corresponding to the mounting holes.

[0074] During installation, the two semicircular bodies are symmetrically clamped onto the outer wall of the second rod 1232 and the valve stem 5. Then, the two semicircular bodies are connected and tightened by screws 31 to clamp and fix the second rod 1232 and the valve stem 5, so that the valve stem 5 and the piston rod 123 are coaxial and fixedly connected.

[0075] In a preferred embodiment, such as Figure 3 , Figure 4 and Figure 5 As shown, a position sensing frustum 32 is provided on the connector 3, and two sets of position detectors 4 adapted to the position sensing frustum 32 are arranged at intervals on the upper and lower parts of the bracket assembly 2.

[0076] Specifically, a position sensing frustum 32 is fixedly installed at the bottom of connector 3. The position sensing frustum 32 is made of ferromagnetic metal. Two sets of position detectors 4 are arranged side by side on the screw of bracket assembly 2. The two position detectors 4 are installed at the two end points of the movement stroke of connector 3. The position detectors 4 are inductive proximity switches. The inductive proximity switches can detect the position of the position sensing frustum 32 through the principle of electromagnetic induction. The inductive proximity switches are connected to the control system. When piston rod 123 moves down or downward, it drives valve stem 5 of valve to move synchronously, thereby realizing the opening or closing of valve. The position status of piston rod 123 and valve stem 5 can be detected by inductive proximity switches and the position status can be transmitted to the control system for remote monitoring of the opening or closing status of valve, thereby determining whether cylinder assembly 1 is working properly.

[0077] Working principle:

[0078] The bracket assembly 2 of this application is provided with a positioning platform 21-1 and a positioning hole 22-1. The positioning platform 21-1 can quickly achieve the positioning of the cylinder body 11 and the bracket assembly 2, so that the cylinder body 1 and the bracket assembly 2 are coaxially set. The positioning hole 22-1 can be used to position the valve body, so that the valve and the bracket assembly 2 are coaxially set, thereby making the valve stem 5 and the piston rod 123 coaxially set, improving the coaxial positioning accuracy of the connection between the valve stem 5 and the piston rod 123, and reducing the risk of uneven wear.

[0079] Furthermore, this application changes the connection of the first air port 132, thereby altering the output pulling force of the actuator 12. This allows the output pulling force to be either a double-piston pulling force or a single-piston pulling force. The pre-set threaded port 1231-3 enables the air passage to be opened or closed, thus connecting or disconnecting the upper chamber of the upper cylinder from the upper chamber of the lower cylinder. This changes the output thrust of the actuator 12, allowing it to be either a double-piston thrust or a single-piston thrust. In actual use, the appropriate option can be selected based on specific needs. Compared to a single-cylinder pneumatic actuator, this application enriches the functionality of pneumatic actuators.

[0080] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0081] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-cylinder pneumatic actuator, characterized in that, include: The cylinder assembly (1) includes a cylinder body (11) and an actuator (12) arranged coaxially. The actuator (12) is disposed in the inner cavity of the cylinder body (11), and one end of the actuator (12) extends to the outside of the cylinder body (11) for connection with a valve. The cylinder body (11) is provided with an air port (13) communicating with its inner cavity. Gas is filled into the inner cavity of the cylinder body (11) through the air port (13) to push the actuator (12) to reciprocate along its own axis. The bottom of the cylinder body (11) is provided with a positioning groove along its axis. The bracket assembly (2) is fixedly connected to the cylinder body (11) and includes a positioning platform (21-1) and a positioning hole (22-1) arranged coaxially. The positioning platform (21-1) matches the positioning groove and is used to position the cylinder body (11) so that the cylinder body (11) and the bracket assembly (2) are arranged coaxially. The positioning hole (22-1) is used to position the valve so that the valve and the actuator (12) are arranged coaxially.

2. The dual-cylinder pneumatic actuator according to claim 1, characterized in that, The cylinder body (11) includes an upper cylinder barrel (111), a lower cylinder barrel (112), an upper cylinder head (113), a lower cylinder head (114), and a partition (115). The upper cylinder barrel (111) is sealed with the upper cylinder head (113) at its top end, and the lower cylinder barrel (112) is sealed with the lower cylinder head (114) at its bottom end. The lower cylinder barrel (112) is located directly below the upper cylinder barrel (111), and the upper cylinder barrel (111) and the lower cylinder barrel (112) are sealed and isolated by the partition (115) so that an upper cylinder cavity is formed inside the upper cylinder barrel (111) and a lower cylinder cavity is formed inside the lower cylinder barrel (112).

3. A dual-cylinder pneumatic actuator according to claim 2, characterized in that, The actuator (12) includes an upper piston plate (121), a lower piston plate (122), and a piston rod (123). The upper piston plate (121) is slidably disposed in the inner cavity of the upper cylinder to seal and form an upper cylinder upper cavity and an upper cylinder lower cavity. The lower piston plate (122) is slidably disposed in the inner cavity of the lower cylinder to seal and form a lower cylinder upper cavity and a lower cylinder lower cavity. The piston rod (123) includes a first rod body (1231) and a second rod body (1232) that are coaxially and fixedly connected. The two ends of the first rod body (1231) are fixedly connected to the upper piston plate (121) and the lower piston plate (122) respectively. The end of the second rod body (1232) away from the first rod body (1231) extends to the outside of the cylinder body (11).

4. A dual-cylinder pneumatic actuator according to claim 3, characterized in that, The air port (13) includes an upper air port (131), a first middle air port (132), a second middle air port (133), and a lower air port (134). The upper air port (131) is located on the upper cylinder head (113) and communicates with the upper chamber of the upper cylinder. The first middle air port (132) is located on the partition plate (115) and communicates with the lower chamber of the upper cylinder. The second middle air port (133) is located on the partition plate (115) and communicates with the upper chamber of the lower cylinder. The lower air port (134) is located on the lower cylinder head (114) and communicates with the lower chamber of the lower cylinder. The upper air port (131) and the lower air port (134) are both used to connect with the external inflation and deflation mechanism. The first middle air port (132) is used to communicate with the lower air port (134) or with the external atmosphere. The second middle air port (133) is used to seal or communicate with the external atmosphere. When air enters through the lower air inlet (134) and the first middle air inlet (132) is connected to the lower air inlet (134), the actuator (12) outputs a double piston pulling force, causing the piston rod (123) to move upward along its axial direction; When air enters through the lower air inlet (134) and the first middle air inlet (132) is connected to the external atmosphere, the actuator (12) outputs a single-piston pulling force, causing the piston rod (123) to move upward along its axial direction.

5. A dual-cylinder pneumatic actuator according to claim 4, characterized in that, The first rod body (1231) has an air guide channel. One end of the air guide channel is connected to the upper cavity of the lower cylinder, and the other end is provided with a threaded opening (1231-3). A sealing element is detachably connected to the threaded opening (1231-3) to allow the air guide channel to be connected to or not connected to the upper cavity of the upper cylinder. When air enters through the upper air port (131), the second middle air port (133) is sealed, and the air guide channel is connected to the upper chamber of the upper cylinder, the actuator (12) outputs a thrust force as a double piston thrust force, causing the piston rod (123) to move downward along its axial direction; When air enters through the upper air inlet (131), the second middle air inlet (133) is connected to the external atmosphere, and the air guide channel is not connected to the upper chamber of the upper cylinder, the actuator (12) outputs a single-piston thrust, causing the piston rod (123) to move downward along its axial direction.

6. A dual-cylinder pneumatic actuator according to claim 5, characterized in that, The air guide channel includes an axial air guide channel (1231-1) and multiple transverse air guide channels (1231-2). The axial air guide channel (1231-1) is opened within the first rod (1231) along the axial direction of the first rod (1231). The multiple transverse air guide channels (1231-2) are evenly opened within the first rod (1231) along the circumference of the first rod (1231). One end of the axial air guide channel (1231-1) is located on the upper cylinder. The cavity is provided with the threaded port (1231-3), and the other end is located in the upper cavity of the lower cylinder and communicates with the multiple transverse air guide channels (1231-2). The outer wall of the first rod (1231) is also rotatably fitted with a guide sleeve (124). The guide sleeve (124) is evenly provided with multiple transverse through holes (124-1) that communicate with the upper cavity of the lower cylinder along its circumference. The multiple transverse through holes (124-1) correspond one-to-one with the multiple transverse air guide channels (1231-2) and communicate with each other.

7. A dual-cylinder pneumatic actuator according to claim 3, characterized in that, An upper sealing ring (1211) is fitted on the outer circumference of the upper piston plate (121), and a lower sealing ring (1221) is fitted on the outer circumference of the lower piston plate (122). The upper sealing ring (1211) abuts against the inner wall of the upper cylinder (111), and the lower sealing ring (1221) abuts against the inner wall of the lower cylinder (112).

8. A dual-cylinder pneumatic actuator according to claim 2, characterized in that, The bracket assembly (2) includes an upper bracket flange (21) and a lower bracket flange (22) that are coaxial and fixedly connected. The upper bracket flange (21) is fixedly connected to the lower cylinder head (114), and the top of the upper bracket flange (21) is provided with a positioning platform (21-1) protruding along its axial direction. The center of the lower bracket flange (22) is provided with a positioning hole (22-1) along its axial direction. The bottom of the lower cylinder head (114) is provided with a positioning groove recessed along its axial direction. The positioning platform (21-1), the positioning hole (22-1) and the positioning groove are coaxially arranged.

9. A dual-cylinder pneumatic actuator according to claim 3, characterized in that, The second rod (1232) is fixedly provided with a connector (3) for connecting to the valve stem (5) of the valve at one end away from the first rod (1231).

10. A dual-cylinder pneumatic actuator according to claim 9, characterized in that, The connector (3) is provided with a position sensing frustum (32), and the bracket assembly (2) is provided with two sets of position detectors (4) that are adapted to the position sensing frustum (32) at intervals.

Images