Quick release mechanism and air filtering device for positioner

Abstract

The utility model discloses a quick release mechanism and an air filtering device for a positioner, which relate to the technical field of valve positioners, and comprise a communicating unit, a first connecting head, a second connecting head arranged on the inner side of the first connecting head, a sealing washer arranged at the end part of the second connecting head, and a connecting plate arranged on the side wall of the first connecting head, the pull ring is arranged at the end part of the connecting plate; the limiting unit comprises a supporting frame, a connecting rod arranged in the supporting frame, a reset spring arranged on the outer side of the connecting rod, an extrusion block arranged at the end of the reset spring and a limiting piece arranged at the end of the supporting frame. The beneficial effects of the utility model are that through the mutual cooperation between the arranged communication unit and the limiting unit, the connection between the gas pipelines is facilitated; and the device is simple in structure and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of valve positioners, in particular to a quick-release mechanism and an air filter device for a positioner. Background Art

[0002] At the factory's unit boiler secondary damper adjustment site, ABB positioners are often used to drive cylinders to push the dampers to flip for precise adjustment; this is because the cylinders, through the core components of the ABB positioner, can accurately control the position of the damper baffle to ensure stable system operation; ABB positioners not only achieve precise positioning of the equipment, but also optimize the stability and safety of the equipment through ultra-low instrument gas consumption and extremely high seismic resistance; in situations where electromagnetic interference is severe, the ABB TZIDC positioner uses a metal aluminum alloy casing to effectively shield electromagnetic interference, ensuring that internal signals are not affected.

[0003] The positioner has high requirements on the quality of the air source. The existing factory is equipped with an air compression drying system and a separate filter pressure reducing valve for each pneumatic actuator, but it can only solve the particulate impurities in the air, and cannot really clean the water and oil in the equipment pipeline. At the same time, the filtering accuracy of the on-site pressure reducing valve is not high, and the capacity is insufficient, so that impurities, water and oil in the air source enter the positioner, causing the positioner's air path to be blocked and causing equipment damage. At the same time, during the installation of the equipment, the installation and disassembly of the various pipelines is relatively inconvenient, and the staff needs to consume more work energy, which reduces the staff's work efficiency to a certain extent. Utility Model Content

[0004] In view of the above-mentioned prior art problems, the present utility model is proposed.

[0005] The utility model aims to provide a quick-release mechanism, which aims to solve the problem that when the existing positioner is connected with other pneumatic equipment, the pipeline for conveying the gas source is inconvenient to install.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a quick-release mechanism, comprising: a connecting unit, comprising a first connecting head, a second connecting head arranged inside the first connecting head, a sealing gasket arranged at an end of the second connecting head, a connecting plate arranged on a side wall of the first connecting head, and a pull ring arranged at an end of the connecting plate;

[0007] The limiting unit comprises a support frame, a connecting rod arranged inside the support frame, a return spring arranged outside the connecting rod, an extrusion block arranged at an end of the return spring, and a limiting member arranged at an end of the support frame;

[0008] The support frame is fixedly arranged on the side wall of the first connector.

[0009] As a preferred solution of the quick-release mechanism of the utility model, wherein: the first connector includes a through groove opened on its side wall, and a tapered hole arranged at the end of the first connector;

[0010] The second connector includes an arc-shaped groove arranged on its outer wall, and a tapered block arranged on the end of the second connector;

[0011] The first connector is adapted to the second connector; the sealing gasket is located between the first connector and the second connector; the sealing gasket is made of rubber.

[0012] As a preferred solution of the quick-release mechanism of the utility model, wherein: the connecting plate includes a protrusion arranged at its end, a rotating shaft arranged on the side wall of the connecting plate, and a first detour portion opened on the end surface of the connecting plate;

[0013] The through slot also includes an axial hole arranged inside the through slot;

[0014] The rotating shaft matches the shaft hole, and the rotating shaft rotates along the axis direction of the shaft hole.

[0015] As a preferred solution of the quick-release mechanism of the utility model, wherein: the pull ring is arranged at the end of the connecting plate; the pull ring is movably connected to the connecting plate;

[0016] The protrusion contacts the side wall of the arc groove; the protrusion contacts the side wall of the arc groove and pushes the second connector to move towards the first connector; the sealing gasket is compressed to ensure good air tightness between the first connector and the second connector.

[0017] As a preferred solution of the quick-release mechanism of the utility model, wherein: the support frame includes a through hole arranged at the end thereof;

[0018] The extrusion block passes through the through hole and extends to the outside thereof; the extrusion block is adapted to the through hole; the extrusion block is a trapezoidal structure; the extrusion block is welded and fixed to the connecting rod.

[0019] As a preferred solution of the quick-release mechanism of the utility model, wherein: the limit member includes a second detour portion arranged inside the limit member; the limit member and the support frame are welded and fixed; the limit member is a "Z"-shaped structure; the limit member is arranged in the gap between the support frame and the connecting plate.

[0020] As a preferred solution of the quick-release mechanism of the utility model, wherein: the reset spring is sleeved on the outside of the connecting rod; the reset spring moves on the inside of the support frame;

[0021] The side wall of the extrusion block is in contact with the end surface of the connecting plate.

[0022] As a preferred solution of the quick-release mechanism of the utility model, wherein: the connecting rod includes a knob arranged at its end; the connecting rod passes through the supporting frame and extends to the outside thereof;

[0023] The ends of the first connector and the second connector are both connected to a gas pipeline.

[0024] The beneficial effects of the quick-release mechanism of the utility model are as follows: through the cooperation between the provided connecting unit and the limiting unit, the gas pipelines M can be quickly connected, which makes it easier for the staff to connect the various pneumatic devices and ensures the stability of the gas pipelines M during the connection process. The device has a simple structure, is easy to operate, and improves work efficiency.

[0025] Another object of the utility model is to provide an air filter device for a positioner, which aims to solve the problem that the existing positioner is an integrated positioner and has poor air filtering effect during use, causing the positioner to be easily damaged.

[0026] In order to solve the above technical problems, the utility model also provides the following technical solutions: an air filter device for a positioner, comprising a quick-release mechanism; and a local control cabinet; an air filter pressure reducing valve; a positioner body; a position sensor; and an air filter;

[0027] The positioner body is connected to the air filter pressure reducing valve via a connecting unit;

[0028] The positioner body, the air filter pressure reducing valve and the air filter are all installed inside the local control cabinet.

[0029] As a preferred solution of the air filter device for the positioner of the utility model, wherein: the positioner body and the position sensor are linearly connected.

[0030] The beneficial effects of the air filter device for the positioner of the utility model are as follows: the device adopts a separate positioner, and the positioner is installed inside the control cabinet. The water, oil and other impurities inside the air source can be better filtered through the air filter pressure reducing valve, ensuring the cleanliness of the air source; and the service life of the positioner body is improved to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a structural schematic diagram of the utility model.

[0033] Figure 2 It is a schematic diagram of the connection structure between the first connector and the second connector in the utility model.

[0034] Figure 3 It is a schematic diagram of the explosion structure of the connected unit in the utility model.

[0035] Figure 4 It is a partial cross-sectional view of the first connector in the utility model.

[0036] Figure 5 For the utility model Figure 4 A is a partial enlarged view of the DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Example 1

[0041] Reference Figure 1, is the first embodiment of the utility model, which provides a quick-release mechanism, including a connecting unit 400, including a first connecting head 401, a second connecting head 402 arranged on the inner side of the first connecting head 401, a sealing gasket 403 arranged at the end of the second connecting head 402, a connecting plate 404 arranged on the side wall of the first connecting head 401, and a pull ring 405 arranged at the end of the connecting plate 404.

[0042] Preferably, the first connector 401 and the second connector 402 are matched with each other; the end of the second connector 402 is inserted into the first connector 401, and the first connector 402 can compress the sealing gasket 403 between the first connector 401 and the first connector 402 during the movement of the first connector 402 close to the first connector 401, so as to ensure the tightness of the connection between the first connector 401 and the second connector 402; so that the pipe joint can transport media such as gas and liquid; the number of connecting plates 404 provided is two groups, and the two groups of connecting plates 404 are symmetrically arranged on both sides of the first connector 401; the rotation of the connecting plate 404 can drive the first connecting head 402 to move, so that the first connecting head 402 is pressed against the inner side of the first connecting head 401; the set pull ring 405 can better facilitate the staff to pull the pull ring 405 to drive the connecting plate 404 to flip when the connecting plate 404 is fastened, so as to better facilitate the staff's operation.

[0043] Furthermore, the limiting unit 500 includes a support frame 501, a connecting rod 502 arranged inside the support frame 501, a return spring 503 arranged on the outside of the connecting rod 502, an extrusion block 504 arranged at the end of the return spring 503, and a limiting member 505 arranged at the end of the support frame 501; the support frame 501 is fixedly arranged on the side wall of the first connecting head 401.

[0044] Preferably, the support frame 501 is fixedly arranged on one side of the outer wall of the first connecting head 401; the connecting rod 502 plays a role in guiding the return spring 503, so that when the return spring 503 is compressed by the extrusion block 504, the return spring 503 can be gradually compressed along the outer side of the connecting rod 502, to a certain extent, ensuring that the return spring 503 will not exceed the range of its elastic deformation during the compression process; the extrusion block 504 can limit the connection plate 404; thereby effectively preventing the staff from accidentally touching the connection plate 404 and causing it to flip over, causing The second connecting head 402 is separated from the first connecting head 401; the stability of the connection between the second connecting head 402 and the first connecting head 401 is ensured; the set limit piece 505 can limit the extrusion block 504 when the extrusion block 504 is retracted to the end position of the support frame 501, and ensure that the extrusion block 504 will not move to the end of the connecting plate 404 under the action of the rebound force of the reset spring 503; thereby facilitating the staff to flip the connecting plate 404 and complete the separation between the first connecting head 401 and the second connecting head 402.

[0045] When in use, when connecting the first connecting head 401 and the second connecting head 402, the staff inserts the second connecting head 402 into the first connecting head 401, and then rotates the connecting plate 404, so that the connecting plate 404 flips and drives the second connecting head 402 to move, so that the second connecting head 402 moves in the direction close to the first connecting head 401, so that the second connecting head 402 cooperates with the first connecting head 401 to press and fix the sealing gasket 403; as the connecting plate 404 flips, the connecting plate 404 gradually compresses the extrusion block 504 during the rotation process, and the extrusion block 504 is compressed and moves toward the inside of the support frame 501; as the rotation occurs, the connecting plate 404 gradually becomes vertical, and when the connecting plate 404 is in the vertical state, the connecting plate 404 moves to one side of the extrusion block 504, and the extrusion block 504 is no longer squeezed. The rebound force of the return spring 503 pushes the extrusion block 504 to move, so that the extrusion block 504 moves to the end of the connecting plate 404, thereby better limiting the connection plate 404; when the first connecting head 401 and the second connecting head 402 need to be separated, the connecting rod 502 is pulled so that the connecting rod 502 drives the extrusion block 504 to move, so that the extrusion block 504 moves to one side of the connecting plate 404, and the extrusion block 504 no longer limits the connecting plate 404. When the end of the extrusion block 504 moves to the position of the limiting member 505, the provided limiting member 505 can limit the extrusion block 504 to ensure that the extrusion block 504 is fixed in the inner position of the support frame 501; pull the pull ring 405 to flip it in the opposite direction, so that the connecting plate 404 no longer presses the second connecting head 402, and then the first connecting head 401 and the second connecting head 402 can be separated.

[0046] In summary, the connecting unit 400 and the limiting unit 500 can more closely ensure the stability of the pipeline connection during the cooperation process; the device structure is simple and easy to operate, which improves the work efficiency of the staff to a certain extent and can complete the installation of the pneumatic components more quickly.

[0047] Example 2

[0048] Reference Figures 1 to 4 , which is the second embodiment of the utility model, includes: the first connecting head 401 includes a through groove 401a opened on the side wall thereof, and a tapered hole 401b arranged at the end of the first connecting head 401; the second connecting head 402 includes an arc groove 402a arranged on the outer wall thereof, and a tapered block 402b arranged at the end of the second connecting head 402; the first connecting head 401 and the second connecting head 402 are adapted to each other; the sealing gasket 403 is located between the first connecting head 401 and the second connecting head 402; the sealing gasket 403 is made of rubber.

[0049] Preferably, there are two groups of through grooves 401a, which are symmetrically arranged on both sides of the side wall of the first connector 401; a mounting platform is arranged on the top of the tapered hole 401b; a sealing gasket 403 is arranged above the mounting platform; a tapered block 402b is matched with the tapered hole 401b, and its structure is a tapered structure, so that it can be tighter during the connection process to ensure the air tightness of the pipeline connection; the arc groove 402a is opened along the outer wall of the second connector 402, so that when the second connector 402 is inserted into the first connector 401, there is no need to consider the position of matching with the connecting plate 404, which is more convenient for the staff to install and connect.

[0050] Furthermore, the connecting plate 404 includes a protrusion 404a arranged at its end, a rotating shaft 404b arranged on the side wall of the connecting plate 404, and a first detour portion 404c opened on the end face of the connecting plate 404; the through groove 401a also includes an axial hole 404a-1 arranged therein; the rotating shaft 404b cooperates with the axial hole 404a-1, and the rotating shaft 404b rotates along the axial direction of the axial hole 404a-1.

[0051] Preferably, the protrusion 404a is a cylindrical protrusion structure, and during the process of turning the connecting plate 404, the rotating shaft 404b rotates along the axial direction of the shaft hole 401a-1; the rotation range of the protrusion 404a is located on the inner side of the arc groove 402a, and the end of the protrusion 404a can contact the bottom of the arc groove 402a; as the connecting plate 404 rotates, the protrusion 404a will drive the second connecting head 402 to move along a straight line direction; the first detour portion 404c is set, after the protrusion 404a and the second connecting head 402 are fully in contact, the position between the second connecting head 402 and the first connecting head 401 is fixed, and at this time, the protrusion 404a is subjected to a greater force, and at this time, the connecting plate 404 is pushed, and the connecting plate 404 is flipped along the arc track direction of the first detour portion 404c; so that the end of the connecting plate 404 can be moved to one side of the extrusion block 504, which is better for the extrusion block 504 to limit the connecting plate 404.

[0052] Furthermore, the pull ring 405 is arranged at the end of the connecting plate 404; the pull ring 405 is movably connected to the connecting plate 404; the protrusion 404a contacts the side wall of the arc groove 402a; the protrusion 404a contacts the side wall of the arc groove 402a and pushes the second connector 402 to move toward the first connector 401; the sealing gasket 403 is pressed to ensure good air tightness between the first connector 401 and the second connector 402.

[0053] Preferably, the pull ring 405 is arranged at the end of the connecting plate 404, and the pull ring 405 is arranged at the end of the connecting plate 404 for rotation, so that the pull ring 405 can be flexibly flipped at an angle; the set pull ring 405 is fixed between the connecting plate 404 and the second connecting head 402, and when the connecting plate 404 is tightly attached to the outer wall of the first connecting head 401, the operator can pull the pull ring 405 to drive the connecting plate 404 to rotate, thereby making it easier for the staff to disassemble the first connecting head 401 and the second connecting head 402.

[0054] Preferably, the support frame 501 includes a through hole 501a arranged at its end; the extrusion block 504 passes through the through hole 501a and extends to the outside thereof; the extrusion block 504 is adapted to the through hole 501a; the extrusion block 504 is a trapezoidal structure; the extrusion block 504 is welded and fixed to the connecting rod 502.

[0055] Preferably, the through hole 501a is located at one end of the support frame 501, and the extrusion block 504 cooperates with the through hole 501a, and the extrusion block 504 moves along the trajectory inside the through hole 501a; the extrusion block 504 is a trapezoidal structure, and the inclined surface at one end can move in the vertical direction when squeezed by the connecting plate 404, so that the extrusion block 504 can move to the inside of the support frame 501; the extrusion block 504 can compress the reset spring 503; the rebound force of the reset spring 503 can push the extrusion block 504 to reset, so that the extrusion block 504 can return to its original position.

[0056] Furthermore, the limiting member 505 includes a second detour portion 505a disposed inside the limiting member 505; the limiting member 505 is fixed to the support frame 501 by welding;

[0057] The limit member 505 is a "Z"-shaped structure; the limit member 505 is set in the gap between the support frame 501 and the connecting plate 404; the reset spring 503 is sleeved on the outside of the connecting rod 502; the reset spring 503 moves inside the support frame 501; the side wall of the extrusion block 504 is in contact with the end face of the connecting plate 404.

[0058] Preferably, the limit member 505 is welded and fixed to the support frame 501, and when the extrusion block 504 is located at the end of the connecting plate 404, the limit member 505 is squeezed at this time, and the limit member 505 turns over along the arc trajectory of the second detour portion 505a; when the extrusion block 504 is not compressing the limit member 505, the end face of the limit member 505 can be located at the end of the extrusion block 504 in the normal state, blocking the position of the extrusion block 504; it should be noted that the force required for bending at the position of the second detour portion 505a is greater than the rebound force of the reset spring 503. , so that the limit member 505 can limit the extrusion block 504 under normal conditions; the limit member 505 is set between the support frame 501 and the connecting plate 404; during the extrusion process of the connecting plate 404 on the extrusion block 504, the end of the extrusion block 504 does not move to the side of the end of the limit member 505, so that the extrusion block 504 can be reset under the action of the reset spring 503. When limiting the extrusion block 504, it is necessary to pull the connecting rod 502 to drive the extrusion block 504 to move to the side of the limit member 505, and the extrusion block 504 can be limited by the limit member 505.

[0059] Furthermore, the connecting rod 502 includes a knob 502a disposed at its end; the connecting rod 502 passes through the support frame 501 and extends to the outside thereof; the ends of the first connector 401 and the second connector 402 are both connected to the gas pipeline M.

[0060] Preferably, the knob 502a is located on the outside of the support frame 501, so that it is more convenient for the staff to pull the knob 502a to drive the connecting rod 502 to move, so that the movement of the connecting rod 502 drives the extrusion block 504 to move, so that the extrusion block 504 can move to the inside of the support frame 501, and the extrusion block 504 can compress the reset spring 503; when the extrusion block 504 is not subjected to external force, the reset spring 503 can push the extrusion block 504 to reset, so that the extrusion block 504 can better cooperate with the connecting plate 404; when the end of the limit member 505 contacts the side wall of the extrusion block 504, the friction between the limit member 505 and the extrusion block 504 is small, and will not affect the reset spring 503 from pushing the extrusion block 504 to move.

[0061] During use, when the operator needs to connect the first connector 401 with the second connector 402, the operator inserts the end of the second connector 402 into the first connector 401, and then flips the connecting plate 404, so that the rotating shaft 404b rotates along the axial direction of the shaft hole 401a-1, so that the connecting plate 404 rotates and the protrusion 404a set at its end can be close to the inner wall of the arc groove 402a, and the second connector 402 is driven to move with the rotation of the connecting plate 404; the second connector 402 moves to press the sealing gasket 403 between the second connector 402 and the first connector 401; then the conical block 402b and the conical hole 401b cooperate with each other, so that the first connector 401 and the second connector 402 can be tightly attached; during the flipping process of the connecting plate 404 , the side wall of the connecting plate 404 squeezes the extrusion block 504, so that the extrusion block 504 moves to compress the reset spring 503; as the connecting plate 404 continues to flip, when the connecting plate 404 is in a position where the side wall of the extrusion block 504 is flush, the protrusion 404a and the arc groove 402a are matched and fixed; the connecting plate 404 is continued to be rotated, and the end of the connecting plate 404 flips along the arc trajectory of the first detour portion 404c; so that the connecting plate 404 flips to one side of the extrusion block 504, at this time the extrusion block 504 is no longer squeezed by the connecting plate 404, and under the action of the rebound force of the reset spring 503, the extrusion block 504 is pushed to move, so that the extrusion block 504 moves to one side of the connecting plate 404; the side wall of the extrusion block 504 can be used to limit the connecting plate 404.

[0062] When it is necessary to separate the first connector 401 from the second connector 402, the knob 502a is pulled, and the knob 502a drives the connecting rod 502 to move, so that the connecting rod 502 drives the extrusion block 504 to move, and the end of the extrusion block 504 moves to a position in contact with the side wall of the limiting member 505; at this time, the limiting member 505 can limit the extrusion block 504 to ensure that the extrusion block 504 is fixed inside the support frame 501; since the force required for the end of the limiting member 505 to completely separate from the extrusion block 504 is greater than the force of the reset spring 503 to drive the extrusion block 504 to reset, the extrusion block 504 will not move at this time; then the pull ring 405 is pulled to drive the connecting plate 404 to rotate, so that the rotating shaft 404b Flip in the opposite direction along the axis of the shaft hole 401a-1 so that the end of the protrusion 404a gradually moves away from the arc groove 402a, and then as the arc groove 402a and the protrusion 404a separate, the second connector 402 can be taken out from the first connector 401; in order to facilitate the fixation between the first connector 401 and the second connector 402 next time, the staff needs to push the connecting rod 502 so that the extrusion block 504 squeezes the limiting member 505, and the limiting member 505 bends along the arc trajectory of the second detour portion 505a; so that the end of the limiting member 505 moves to the side wall of the extrusion block 504, so as to facilitate the use of the extrusion block 504 to limit the connecting plate 404 next time.

[0063] In summary, by cooperating with each other through the connection unit and the limit unit, it is possible to better achieve the connection between the gas pipelines M, thereby facilitating the staff to quickly connect the various pneumatic equipment and ensure the stability of the gas pipeline M during the connection process. The device structure is simple and easy to operate, which improves the flexibility of the device.

[0064] Example 3

[0065] Reference Figure 1 to Figure 4 , which is the third embodiment of the utility model, this embodiment further provides an air filtering device for a positioner, including an on-site control cabinet 100; an air filtering pressure reducing valve 200; a positioner body 300; a position sensor 600; an air filter 700; the positioner body 300 and the air filtering pressure reducing valve 200 are connected via a connecting unit 400; the positioner body 300, the air filtering pressure reducing valve 200 and the air filter 700 are all installed inside the on-site control cabinet 100; the positioner body 300 and the position sensor 600 are linearly connected.

[0066] Preferably, the air filter pressure reducing valve 200 and the positioner body 300 are installed in the local control cabinet 100. The air filter pressure reducing valve 200 can ensure that the air source entering the positioner body 300 is filtered to ensure the cleanliness of the air source, thereby ensuring the service life of the positioner body 300 to a certain extent; the positioner body 300 and the position sensor 600 are linearly connected, and a separate positioner is used, which can better facilitate the installation of the positioner body 300 and the maintenance of the positioner body 300 by the staff; the air filter 700 can further ensure the cleanliness of the air inside the local control cabinet 100 and reduce the impurities in the air from entering the pneumatic components.

[0067] When in use, the positioner body 300 is connected to the air filter pressure reducing valve 200. During the connection process, the above-mentioned installation steps of the first connector 401 and the second connector 402 are used to complete the installation of the positioner body 300 and the air filter pressure reducing valve 200; the air source passes through the air filter pressure reducing valve 200, and the internal impurities will be filtered by the air filter pressure reducing valve 200, and then the clean air can enter the interior of the positioner body 300, thereby effectively improving the service life of the positioner body 300; the positioner body 300 and the position sensor 600 are installed in a separate manner, further avoiding the positioner body 300 from being exposed to the external environment for a long time, thereby extending the service life of the positioner body 300 to a certain extent.

[0068] In summary, the device adopts a separate positioner and installs the positioner inside the control cabinet. The air filter pressure reducing valve is set to better filter the water, oil and other impurities inside the air source to ensure the cleanliness of the air source; to a certain extent, the service life of the positioner body is improved.

[0069] It is important to note that the above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A quick release mechanism, characterized in that: include, A connecting unit (400), comprising a first connecting head (401), a second connecting head (402) arranged inside the first connecting head (401), a sealing gasket (403) arranged at the end of the second connecting head (402), a connecting plate (404) arranged on the side wall of the first connecting head (401), and a pull ring (405) arranged at the end of the connecting plate (404); A limiting unit (500) comprises a support frame (501), a connecting rod (502) arranged inside the support frame (501), a return spring (503) arranged outside the connecting rod (502), an extrusion block (504) arranged at the end of the return spring (503), and a limiting member (505) arranged at the end of the support frame (501); The support frame (501) is fixedly arranged on the side wall of the first connecting head (401).

2. The quick release mechanism according to claim 1, characterized in that: The first connector (401) comprises a through groove (401a) opened on a side wall thereof, and a tapered hole (401b) arranged at an end of the first connector (401); The second connector (402) comprises an arc-shaped groove (402a) arranged on its outer wall, and a tapered block (402b) arranged at the end of the second connector (402); The first connector (401) and the second connector (402) are adapted to each other; the sealing gasket (403) is located between the first connector (401) and the second connector (402); The sealing gasket (403) is made of rubber.

3. The quick release mechanism according to claim 2, characterized in that: The connecting plate (404) comprises a protrusion (404a) arranged at its end, a rotating shaft (404b) arranged on a side wall of the connecting plate (404), and a first detour portion (404c) opened on an end surface of the connecting plate (404); The through groove (401a) further includes an axial hole (404a-1) arranged inside the through groove; The rotating shaft (404b) matches the shaft hole (404a-1), and the rotating shaft (404b) rotates along the axis direction of the shaft hole (404a-1).

4. The quick release mechanism according to claim 3, characterized in that: The pull ring (405) is disposed at the end of the connecting plate (404); the pull ring (405) is movably connected to the connecting plate (404); The protrusion (404a) contacts the side wall of the arc-shaped groove (402a); the protrusion (404a) contacts the side wall of the arc-shaped groove (402a) and pushes the second connector (402) to move in a direction close to the first connector (401); the sealing gasket (403) is pressed to ensure good air tightness between the first connector (401) and the second connector (402).

5. The quick release mechanism according to any one of claims 1 to 4, characterized in that: The support frame (501) comprises a through hole (501a) arranged at an end thereof; The extrusion block (504) passes through the through hole (501a) and extends to the outside thereof; the extrusion block (504) is adapted to the through hole (501a); the extrusion block (504) is a trapezoidal structure; and the extrusion block (504) and the connecting rod (502) are welded and fixed.

6. The quick release mechanism according to claim 5, characterized in that: The limiting member (505) comprises a second detour portion (505a) arranged inside the limiting member (505); the limiting member (505) and the support frame (501) are welded and fixed; the limiting member (505) is a "Z"-shaped structure; The limiting member (505) is arranged in the gap between the supporting frame (501) and the connecting plate (404).

7. The quick release mechanism according to claim 6, characterized in that: The return spring (503) is sleeved on the outside of the connecting rod (502); the return spring (503) moves inside the support frame (501); The side wall of the extrusion block (504) is in contact with the end surface of the connecting plate (404).

8. The quick release mechanism according to claim 7, characterized in that: The connecting rod (502) includes a knob (502a) arranged at an end thereof; The connecting rod (502) passes through the supporting frame (501) and extends to the outside thereof; The ends of the first connector (401) and the second connector (402) are both connected to a gas pipeline (M).

9. An air filter device for a positioner, characterized in that: comprising the quick release mechanism according to any one of claims 1 to 8; and On-site control cabinet (100); air filter pressure reducing valve (200); positioner body (300); position sensor (600); air filter (700); The positioner body (300) is connected to the air filter pressure reducing valve (200) via a communication unit (400); The positioner body (300), the air filter pressure reducing valve (200) and the air filter (700) are all installed inside the local control cabinet (100).

10. The air filter device for a positioner according to claim 9, characterized in that: The positioner body (300) and the position sensor (600) are linearly connected.

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