Plug valve with switching structure and switching method thereof

Abstract

The invention relates to the technical field of valves, in particular to a plug valve with a switching structure and a switching method thereof.The plug valve with the switching structure comprises a valve body, a valve element, a rotating rod, a supporting frame, a mounting box, a gear motor, a supporting seat, an emergency shaft rod and a switching mechanism, and the switching mechanism is provided with a switching output end and a connecting output end; the number of the connecting output ends is two, one connecting output end is used for connecting the gear motor and the rotating rod, the other connecting output end is used for connecting the emergency shaft rod and the rotating rod, and the switching output end is used for connecting the rotating rod and the gear motor or connecting the rotating rod and the emergency shaft rod. According to the device, the plug valve can be flexibly switched between a manual control mode and an electric control mode according to needs, and it is ensured that the plug valve can be suitable for different working environments.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a plug valve with a switching structure and a switching method thereof. Background Art

[0002] A plug valve is a rotary valve with a closing member or plunger shape. It is opened or closed by rotating 90 degrees to connect or separate the channel opening on the valve plug with the channel opening on the valve body.

[0003] The valve plug can be cylindrical or conical in shape. The passageway in a cylindrical plug is generally rectangular, while the passageway in a conical plug is trapezoidal. These shapes make the plug valve lightweight. It is best suited for switching and connecting media and for diverting flow, but can also be used for throttling, depending on the properties of the application and the erosion resistance of the sealing surface.

[0004] The problem with the existing technology is that when the electric-controlled plug valve suddenly loses power or the motor on the electric-controlled valve fails, the plug valve cannot be opened or closed. Therefore, it is necessary to design a new type of plug valve to solve the above problem. Summary of the Invention

[0005] Based on this, it is necessary to provide a plug valve with a switching structure and a switching method thereof to address the existing technical problems.

[0006] In order to solve the problems of the existing technology, the technical solution adopted by the present invention is: a plug valve with a switching structure, including a valve body, a valve core arranged inside the valve body and a rotating rod coaxially fixed on the valve core, and also including a support frame symmetrically fixed on the valve body, an installation box fixed on the support frame, a reduction motor fixed in the installation box, a support seat fixed in the installation box, an emergency shaft rod rotatably arranged in the support seat, a handle coaxially fixed at the end of the emergency shaft rod and a switching mechanism arranged in the installation box, the switching mechanism has a switching output end and a connecting output end, the connecting output end has two, one for connecting the reduction motor and the rotating rod, and the other for connecting the emergency shaft rod and the rotating rod, the switching output end is used to establish a connection between the rotating rod and the reduction motor, or to establish a connection between the rotating rod and the emergency shaft rod.

[0007] Furthermore, a worm gear is coaxially fixed on the rotating rod, and two limit brackets are fixed on the sides of the worm gear. The two limit brackets are symmetrically arranged and are both fixedly connected to the mounting box. The worm is rotatably arranged on the two limit brackets, and the worm gear is engaged with the worm. One end of the worm is connected to the reduction motor transmission, and the other end is connected to the emergency shaft transmission.

[0008] Furthermore, the switching mechanism also includes a connecting shaft coaxially fixed with the output shaft of the reduction motor, a connecting chuck coaxially fixed on the connecting shaft, an adapter chuck coaxially fixed with the emergency shaft rod, an adapter shaft coaxially fixed at both ends of the worm gear, an adapter sleeve rod coaxially connected with a key, a bearing ring coaxially fixed on each adapter sleeve rod, a connecting chuck coaxially fixed on each bearing ring, a limiting slider fixed on the mounting box and located on one side of the worm gear, a U-shaped plate slidably arranged on the limiting slider, a bearing bracket fixed on the U-shaped plate, a first magnet fixed on the bearing bracket, a mounting bracket fixed on one side of the limiting slider, a second magnet fixed on the mounting bracket, a connecting cross plate fixedly connected to the U-shaped plate, and a supporting bracket symmetrically fixed at both ends of the connecting cross plate, and a bearing ring is rotatably arranged on each supporting bracket.

[0009] Furthermore, the supporting bracket and the mounting bracket are both made of magnetic conductive materials, and the first magnet and the second magnet are electromagnets.

[0010] Furthermore, the two connecting chucks are the two switching output ends of the switching mechanism.

[0011] Furthermore, each adapter shaft side wall is provided with a plurality of limit grooves along its axis in a ring shape, and each adapter sleeve inner wall is provided with a plurality of limit bars along its axis in a ring shape. The plurality of limit grooves correspond to the plurality of limit bars one by one and are slidably matched. A limit ring is fixedly provided on each limit bracket, and a rotating ring is rotatably provided on each limit ring. A limit spring is provided on each rotating ring, and one end of the limit spring is connected to the rotating ring, and the other end is connected to the bearing ring. The elasticity of the limit spring close to the adapter chuck is greater than the elasticity of the limit spring close to the connecting chuck.

[0012] Furthermore, the switching mechanism also includes two limit supports fixedly arranged on the mounting box, a transmission tube rotatably arranged on the two limit supports, a threaded rod rotatably arranged in the transmission tube, a contact bevel fixedly arranged on the end of the threaded rod away from the transmission tube, an adapter plate fixedly arranged on one side of the contact bevel and a guide rod fixedly arranged on the adapter plate, the guide rod passes through the limit supports and slides with the limit supports, a torsion countersunk hole is provided at the end of the transmission tube, and a contact bevel is provided on the side wall of the supporting bracket.

[0013] Furthermore, a sliding rheostat is provided beside the mounting bracket, a toggle plate is fixedly provided on the touch bevel block, one end of the toggle plate is fixedly connected to the touch bevel block, and the other end is fixedly connected to the sliding piece of the sliding rheostat.

[0014] A method for switching a plug valve with a switching structure comprises the following steps: S1: When the device is operating normally, the first magnet and the second magnet are energized, causing them to attract each other, causing the connecting chuck and the connecting chuck, which are closer to the connecting shaft, to be clamped together. At this time, the rotation of the valve core can be controlled by starting and stopping the reduction motor; S2: When power is cut off, the device is in a power-off state, the first magnet and the second magnet no longer have magnetism, and under the action of the limit spring, the connecting chuck and the adapter chuck closer to the emergency shaft are clamped together, and then the plug valve can be manually controlled through the emergency shaft; S3: When the reduction motor 8 fails, there is still power in the equipment, and the first magnet and the second magnet are still attracted together. At this time, the threaded rod is extended by twisting the transmission tube, and then the contact bevel is driven to be inserted between the carrier bracket and the mounting bracket, forcibly separating the first magnet and the second magnet, causing the adapter chuck and the connecting chuck closer to the adapter chuck to be stuck together. Then, the plug valve can be manually controlled through the emergency shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects: Firstly, the device can flexibly switch the plug valve between manual control mode and electric control mode according to needs, ensuring that the plug valve can be applied to different working environments; Second: This device can automatically switch to manual control mode in the event of a power outage, and can also switch the plug valve to manual control mode through the built-in mechanical structure when the reduction motor fails; Thirdly, when separating the first magnet and the second magnet, the device sets a sliding rheostat to increase the resistance value of the sliding rheostat and reduce the current, thereby making the separation process easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the embodiment; Figure 2 is a three-dimensional structural cross-sectional view of an embodiment; Figure 3 This is a cross-sectional view of the valve core of the embodiment; Figure 4 is a schematic diagram of the three-dimensional structure of the electric control mode of the embodiment; Figure 5 is a schematic diagram of the three-dimensional structure of the manual control mode of the embodiment; Figure 6 is a three-dimensional structural cross-sectional view of the worm gear in the electronic control mode of the embodiment; Figure 7 yes Figure 6 A schematic diagram of the structure at center A; Figure 8 yes Figure 7 A magnified schematic diagram of the structure at point B in the middle; Figure 9 This is a schematic diagram of the exploded three-dimensional structure of the connecting chuck and the engaging chuck of the embodiment; Figure 10 is a schematic diagram of the three-dimensional structure of the switching mechanism of the embodiment; Figure 11 It is a schematic diagram of the three-dimensional structure of the U-shaped plate of the embodiment.

[0017] The numbers in the figure are: 1, valve body; 2, valve core; 3, rotating rod; 4, worm gear; 5, worm; 6, limit bracket; 7, support frame; 8, reduction motor; 9, connecting shaft; 10, connecting chuck; 11, adapter shaft; 12, limit groove; 13, adapter sleeve; 14, limit strip; 15, load ring; 16, connecting chuck; 17, supporting bracket; 18, connecting cross plate; 19, limit ring; 20, rotating ring; 21, limit spring; 22, limit Slider; 23. U-shaped plate; 24. Carrying bracket; 25. First magnet; 26. Interference inclined plane; 27. Mounting bracket; 28. Second magnet; 29. ​​Sliding rheostat; 30. Limit support; 31. Transmission tube; 32. Twisting countersunk hole; 33. Threaded rod; 34. Touch inclined block; 35. Adapter plate; 36. Guide rod; 37. Toggle plate; 38. Mounting box; 39. Support seat; 40. Emergency shaft; 41. Handle; 42. Adapter chuck. DETAILED DESCRIPTION

[0018] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] refer to Figures 1 to 11 : A plug valve with a switching structure includes a valve body 1, a valve core 2 arranged inside the valve body 1 and a rotating rod 3 coaxially fixedly arranged on the valve core 2, and further includes a support frame 7 symmetrically fixedly arranged on the valve body 1, a mounting box 38 fixedly arranged on the support frame 7, a reduction motor 8 fixedly arranged in the mounting box 38, and a support seat 39 fixedly arranged in the mounting box 38 (such as Figure 4 As shown), the emergency shaft rod 40 is rotatably arranged in the support seat 39, the handle 41 is coaxially fixed to the end of the emergency shaft rod 40 and the switching mechanism is arranged in the installation box 38, the switching mechanism has a switching output end and a connection output end, the connection output end has two, one is used to connect the reduction motor 8 and the rotating rod 3, and the other is used to connect the emergency shaft rod 40 and the rotating rod 3, the switching output end is used to establish a connection between the rotating rod 3 and the reduction motor 8, or to establish a connection between the rotating rod 3 and the emergency shaft rod 40.

[0020] When the device is in operation, the reduction motor 8 ultimately drives the rotating rod 3 to rotate, thereby controlling the start and stop of the valve core 2. At this time, the plug valve is in the electronic control mode. When the equipment fails, the reduction motor 8 cannot normally control the start and stop of the plug valve. Then the switching mechanism is operated, and the output end is switched so that the rotating rod 3 is connected to the emergency shaft rod 40, thereby switching the plug valve from the electronic control mode to the manual control mode.

[0021] In order to show the connection relationship between the reduction motor 8, the emergency shaft 40 and the rotating rod 3, the following features are also provided: A worm gear 4 is coaxially fixed on the rotating rod 3, and two limit brackets 6 are fixed on the side of the worm gear 4. The two limit brackets 6 are symmetrically arranged and are both fixedly connected to the mounting box 38. The worm 5 is rotatably arranged on the two limit brackets 6, and the worm gear 4 is engaged with the worm 5. One end of the worm 5 is connected to the reduction motor 8 for transmission, and the other end is connected to the emergency shaft 40 for transmission.

[0022] When the plug valve is in the electric control mode, the reduction motor 8 drives the worm 5 to rotate. At this time, the worm 5 is disconnected from the emergency shaft 40. Then the worm 5 rotates to drive the worm wheel 4 to rotate. The rotation of the worm wheel 4 drives the rotating rod 3 to rotate. The rotation of the rotating rod 3 drives the valve core 2 to rotate, thereby realizing the electric start and stop of the plug valve; similarly, when the plug valve is manually controlled, the emergency shaft 40 drives the worm 5 to rotate. At this time, the worm 5 is disconnected from the reduction motor 8. Then the worm 5 rotates to drive the worm wheel 4 to rotate. The rotation of the worm wheel 4 drives the rotating rod 3 to rotate. The rotation of the rotating rod 3 drives the valve core 2 to rotate, thereby realizing the manual start and stop of the plug valve.

[0023] In order to show the detailed structure of the switching mechanism, the following features are also set: The switching mechanism also includes a connecting shaft 9 coaxially connected to the output shaft of the reduction motor 8, and a connecting chuck 10 coaxially fixedly arranged on the connecting shaft 9 (such as Figure 9 As shown), the adapter chuck 42 coaxially connected to the emergency shaft 40 (as shown Figure 7 As shown), an adapter shaft 11 coaxially fixedly provided at both ends of the worm 5, an adapter sleeve rod 13 coaxially key-connected and sleeved on each adapter shaft 11, a carrying ring 15 coaxially fixedly provided on each adapter sleeve rod 13, a connecting chuck 16 coaxially fixedly provided on each carrying ring 15, a limiting slider 22 fixedly provided on the mounting box 38 and located on one side of the worm 5, a U-shaped plate 23 slidingly provided on the limiting slider 22, a carrying bracket 24 fixedly provided on the U-shaped plate 23, a first magnet 25 fixedly provided on the carrying bracket 24, a mounting bracket 27 fixedly provided on one side of the limiting slider 22, a second magnet 28 fixedly provided on the mounting bracket 27, a connecting transverse plate 18 fixedly connected to the U-shaped plate 23 and supporting brackets 17 symmetrically fixedly provided at both ends of the connecting transverse plate 18, and a carrying ring 15 being rotatably provided on each supporting bracket 17.

[0024] The supporting bracket 24 and the mounting bracket 27 are both made of magnetic conductive materials, and the first magnet 25 and the second magnet 28 are electromagnets.

[0025] The two connecting chucks 16 are the two switching output ends of the switching mechanism.

[0026] When the device is in the electronic control mode, the first magnet 25 and the second magnet 28 are energized (it should be noted that a power supply is provided in the device, and the power supply is used to power the first magnet 25, the second magnet 28 and the reduction motor 8), so that the magnetic properties of the first magnet 25 and the second magnet 28 become opposite. Therefore, under the action of magnetism, the first magnet 25 drives the carrier bracket 24 to approach the mounting bracket 27 until the carrier bracket 24 is tightly attached to the mounting bracket 27. When the above-mentioned carrier bracket 24 moves, the carrier bracket 24 drives the U-shaped plate 23 to slide on the limit slider 22. The movement of the U-shaped plate 23 drives the connecting cross plate 18 to move. The movement of the connecting cross plate 18 drives the two supporting brackets 17 to move. The movement of the two supporting brackets 17 drives the carrying ring 15 to move horizontally, thereby driving the adapter sleeve 13 to move along the axis of the adapter shaft 11, and finally causing the connecting chuck 16 near the connecting shaft 9 to be stuck with the connecting chuck 10, and the connecting chuck 16 near the emergency shaft 40 to be separated from the adapter chuck 42. At this time, the plug valve is in the electronic control mode. The transmission relationship in the electronic control mode is: the reduction motor 8 drives the connecting shaft 9 to rotate, the connecting shaft 9 drives the connecting chuck 10 to rotate, the connecting chuck 10 drives the connecting chuck 16 to rotate, the connecting chuck 16 drives the adapter sleeve 13 to rotate, the adapter sleeve 13 rotates to drive the adapter shaft 11 to rotate, the adapter shaft 11 rotates to drive the worm 5 to rotate, and then the worm 5 rotates to drive the worm wheel 4 to rotate, thereby controlling the rotation of the valve core 2.

[0027] When the equipment fails, the reduction motor 8 cannot operate normally. At this time, the carrying bracket 24 and the mounting bracket 27 are separated (the specific separation method will be introduced later), so that the connecting cross plate 18 moves horizontally in the opposite direction, causing the connecting chuck 16 near the emergency shaft 40 to be stuck with the adapter chuck 42, and the connecting chuck 16 near the connecting shaft 9 to be separated from the connecting chuck 10. At this time, the plug valve is in manual control mode. The transmission relationship in manual control mode is: the emergency shaft 40 is rotated by twisting the handle 41, and the emergency shaft 40 rotates to drive the adapter chuck 42 to rotate. The adapter chuck 42 rotates to drive the connecting chuck 16 to rotate. The connecting chuck 16 drives the adapter sleeve 13 to rotate. The adapter sleeve 13 rotates to drive the adapter shaft 11 to rotate. The adapter shaft 11 rotates to drive the worm 5 to rotate. Then the worm 5 rotates to drive the worm wheel 4 to rotate, thereby controlling the rotation of the valve core 2.

[0028] In order to show the detailed connection relationship between the adapter shaft 11 and the adapter sleeve rod 13, the following features are specifically provided: A plurality of limit grooves 12 are provided in a ring shape along the axis of each adapter shaft 11 on the side wall, and a plurality of limit bars 14 are provided in a ring shape along the axis of each adapter sleeve 13 on the inner wall. The limit grooves 12 correspond to the limit bars 14 one by one and are slidably matched. A limit ring 19 is fixedly provided on each limit bracket 6, and a rotating ring 20 is rotatably provided on each limit ring 19. A limit spring 21 is provided on each rotating ring 20, and one end of the limit spring 21 is connected to the rotating ring 20, and the other end is connected to the carrying ring 15. The elasticity of the limit spring 21 near the adapter chuck 42 is greater than the elasticity of the limit spring 21 near the connecting chuck 10.

[0029] When the connecting cross plate 18 is moved by the U-shaped plate 23, the limit spring 21 adaptively contracts, and the limit strip 14 on the inner wall of the adapter sleeve 13 slides with the limit groove 12 on the adapter shaft 11. When the adapter sleeve 13 rotates, the setting of the limit groove 12 and the limit strip 14 can ensure the normal transmission of rotational power, and the rotating ring 20 set on the limit ring 19 can ensure that when the adapter sleeve 13 rotates, the limit spring 21 can normally expand and contract. It should be noted that when the equipment is not powered on, under normal circumstances, due to the difference in elasticity of the two limit springs 21, the connecting chuck 16 near the emergency shaft 40 is stuck together with the adapter chuck 42, and the connecting chuck 16 near the connecting shaft 9 is separated from the connecting chuck 10.

[0030] In order to ensure that when the reduction motor 8 has a short circuit fault, the device can switch to the manual start-stop plug valve, the following features are also set: The switching mechanism also includes two limit supports 30 fixedly mounted on the mounting box 38, a transmission tube 31 rotatably mounted on the two limit supports 30, a threaded rod 33 threadedly mounted in the transmission tube 31, and a contact bevel 34 fixedly mounted at one end of the threaded rod 33 away from the transmission tube 31 (such as Figure 10 As shown), an adapter plate 35 fixedly arranged on one side of the contact inclined block 34 and a guide rod 36 fixedly arranged on the adapter plate 35, the guide rod 36 passes through the limit support 30 and slides with the limit support 30, a torsion countersunk hole 32 is provided at the end of the transmission tube 31, and a contact inclined surface 26 is provided on the side wall of the supporting bracket 24.

[0031] When the device is running, by twisting the transmission tube 31, the transmission tube 31 rotates, causing the threaded rod 33 to extend along the axis of the transmission tube 31. The threaded rod 33 extends and drives the contact bevel 34 to be inserted between the supporting bracket 24 and the mounting bracket 27. As the contact bevel 34 gradually penetrates deeper, the supporting bracket 24 gradually moves away from the mounting bracket 27. During the above process, the guide rod 36 slides adaptively on the limit support 30.

[0032] In order to ensure that the contact ramp 34 can more easily separate the first magnet 25 and the second magnet 28, the following features are also provided: A sliding rheostat 29 is provided beside the mounting bracket 27 , and a toggle plate 37 is fixedly provided on the touch bevel block 34 . One end of the toggle plate 37 is fixedly connected to the touch bevel block 34 , and the other end is fixedly connected to the sliding piece of the sliding rheostat 29 .

[0033] When the threaded rod 33 drives the contact bevel 34 to extend along the axis of the transmission tube 31, the contact bevel 34 drives the toggle plate 37 to move, and the movement of the toggle plate 37 drives the slider to move, causing the resistance value of the sliding rheostat 29 to increase (the sliding rheostat 29 is connected to the circuit and is used to adjust the current input to the first magnet 25 and the second magnet 28 in the circuit), thereby causing the current input to the first magnet 25 and the second magnet 28 to decrease, thereby making it easier to insert the contact bevel 34 between the mounting bracket 27 and the carrier bracket 24, waiting for the equipment fault to be repaired, and rotating the transmission tube 31 in the opposite direction, causing the threaded rod 33 to reset, and the reset of the threaded rod 33 drives the contact bevel 34 to reset, and the reset of the contact bevel 34 drives the slider to reset, ensuring that the current input to the first magnet 25 and the second magnet 28 by the circuit becomes normal.

[0034] A method for switching a plug valve with a switching structure comprises the following steps: S1: When the device is operating normally, the first magnet 25 and the second magnet 28 are energized, causing the first magnet 25 and the second magnet 28 to attract each other, so that the connecting chuck 16 and the connecting chuck 10, which are closer to the connecting shaft 9, are clamped together. At this time, the rotation of the valve core 2 can be controlled by starting and stopping the reduction motor 8; S2: When a power outage occurs, the device is in a power-off state, and the first magnet 25 and the second magnet 28 no longer have magnetism. Under the action of the limit spring 21, the connecting chuck 16 and the adapter chuck 42, which are closer to the emergency shaft 40, are locked together. Then, the stopcock can be manually controlled through the emergency shaft 40. S3: When the reduction motor 8 fails, there is still power in the device, and the first magnet 25 and the second magnet 28 are still attracted together. At this time, the threaded rod 33 is extended by twisting the transmission tube 31, and then the contact bevel 34 is driven to be inserted between the carrier bracket 24 and the mounting bracket 27, forcibly separating the first magnet 25 and the second magnet 28, causing the adapter chuck 42 to be stuck with the connecting chuck 16 closer to the adapter chuck 42. Then, the stopcock can be manually controlled through the emergency shaft 40.

[0035] The working principle of this device is as follows: when the plug valve needs to be in the electric control mode, the first magnet 25 and the second magnet 28 are energized, so that the supporting bracket 24 is in close contact with the mounting bracket 27, and the movement of the supporting bracket 24 drives the U-shaped plate 23 to slide on the limit slider 22, and the movement of the U-shaped plate 23 drives the connecting cross plate 18 to move, and the movement of the connecting cross plate 18 drives the two supporting brackets 17 to move, and the movement of the two supporting brackets 17 drives the carrying ring 15 to move horizontally, thereby driving the adapter sleeve 13 to move along the axis of the adapter shaft 11, and finally causing the connecting card near the connecting shaft 9 to move. The disk 16 is stuck together with the connecting chuck 10, and the connecting chuck 16 near the emergency shaft 40 is separated from the adapter chuck 42. At this time, the plug valve is in the electric control mode. The transmission relationship in the electric control mode is that the reduction motor 8 drives the connecting shaft 9 to rotate, the connecting shaft 9 drives the connecting chuck 10 to rotate, the connecting chuck 10 drives the connecting chuck 16 to rotate, the connecting chuck 16 drives the adapter sleeve 13 to rotate, the adapter sleeve 13 rotates to drive the adapter shaft 11 to rotate, the adapter shaft 11 rotates to drive the worm 5 to rotate, and then the worm 5 rotates to drive the worm wheel 4 to rotate, thereby controlling the rotation of the valve core 2.

[0036] When the equipment fails, fault one: the equipment is powered off, at this time the first magnet 25 and the second magnet 28 no longer have magnetism, and under the action of the limit spring 21, the connecting chuck 16 and the adapter chuck 42 closer to the emergency shaft 40 are stuck together, and then the plug valve can be manually controlled through the emergency shaft 40; fault two: the reduction motor 8 fails, there is power in the equipment circuit, and the transmission tube 31 is twisted to cause the threaded rod 33 to extend along the axis of the transmission tube 31, and the threaded rod 33 extends and drives the contact bevel 34 to be inserted between the carrier bracket 24 and the mounting bracket 27. As the contact bevel 34 gradually penetrates deeper, the carrier bracket 24 gradually moves away from the mounting bracket 27, and the movement of the carrier bracket 24 drives the connecting cross plate 18 to move in the opposite direction, causing the connecting rod near the emergency shaft 40 to move horizontally. The connecting chuck 16 and the adapter chuck 42 are stuck together, and the connecting chuck 16 near the connecting shaft 9 is separated from the connecting chuck 10. At this time, the plug valve is in manual control mode. The transmission relationship in manual control mode is that the emergency shaft 40 is rotated by twisting the handle 41, and the rotation of the emergency shaft 40 drives the adapter chuck 42 to rotate. The rotation of the adapter chuck 42 drives the connecting chuck 16 to rotate. The connecting chuck 16 drives the adapter sleeve 13 to rotate. The rotation of the adapter sleeve 13 drives the adapter shaft 11 to rotate. The rotation of the adapter shaft 11 drives the worm 5 to rotate. Then the rotation of the worm 5 drives the worm wheel 4 to rotate, thereby controlling the rotation of the valve core 2. Through this device, the plug valve can be flexibly switched between the electric control mode and the manual mode, and can automatically switch to the manual mode when a failure occurs in the electric control mode.

[0037] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A plug valve with a switching structure, comprising a valve body (1), a valve core (2) arranged inside the valve body (1), and a rotating rod (3) coaxially fixedly arranged on the valve core (2), characterized in that: The valve body (1) further comprises a support frame (7) symmetrically fixedly arranged on the valve body (1), a mounting box (38) fixedly arranged on the support frame (7), a reduction motor (8) fixedly arranged in the mounting box (38), a support seat (39) fixedly arranged in the mounting box (38), an emergency shaft (40) rotatably arranged in the support seat (39), a handle (41) coaxially fixedly arranged at the end of the emergency shaft (40), and a switching mechanism arranged in the mounting box (38), wherein the switching mechanism comprises a switching output end and a connecting output end, wherein the connecting output end comprises two ends, one for connecting the reduction motor (8) and the rotating rod (3), and the other for connecting the emergency shaft (40) and the rotating rod (3), and the switching output end is used to establish a connection between the rotating rod (3) and the reduction motor (8), or to establish a connection between the rotating rod (3) and the emergency shaft (40).

2. A plug valve with a switching structure according to claim 1, characterized in that: A worm wheel (4) is coaxially fixedly arranged on the rotating rod (3), and two limit brackets (6) are fixedly arranged on the sides of the worm wheel (4). The two limit brackets (6) are symmetrically arranged and are both fixedly connected to the installation box (38). The worm (5) is rotatably arranged on the two limit brackets (6), the worm wheel (4) is meshed with the worm (5), one end of the worm (5) is transmission-connected to the reduction motor (8), and the other end is transmission-connected to the emergency shaft (40).

3. A plug valve with a switching structure according to claim 2, characterized in that: The switching mechanism further comprises a connecting shaft (9) coaxially fixedly connected to the output shaft of the reduction motor (8), a connecting chuck (10) coaxially fixedly arranged on the connecting shaft (9), an adapter chuck (42) coaxially fixedly connected to the emergency shaft (40), an adapter shaft (11) coaxially fixedly arranged at both ends of the worm (5), an adapter sleeve rod (13) coaxially key-connected and sleeved on each adapter shaft (11), a bearing ring (15) coaxially fixedly arranged on each adapter sleeve rod (13), a connecting chuck (16) coaxially fixedly arranged on each bearing ring (15), and a connecting chuck (16) fixedly arranged on the installation box (38) and located on the worm (5). A limit slider (22) on one side, a U-shaped plate (23) slidably arranged on the limit slider (22), a bearing bracket (24) fixedly arranged on the U-shaped plate (23), a first magnet (25) fixedly arranged on the bearing bracket (24), a mounting bracket (27) fixedly arranged on one side of the limit slider (22), a second magnet (28) fixedly arranged on the mounting bracket (27), a connecting transverse plate (18) fixedly connected to the U-shaped plate (23), and supporting brackets (17) symmetrically fixedly arranged at both ends of the connecting transverse plate (18), each supporting bracket (17) being rotatably provided with a bearing ring (15).

4. A plug valve with a switching structure according to claim 3, characterized in that: The supporting card frame (24) and the mounting bracket (27) are both made of magnetic conductive materials, and the first magnet (25) and the second magnet (28) are electromagnets.

5. A plug valve with a switching structure according to claim 4, characterized in that: The two connecting chucks (16) are two switching output ends of the switching mechanism.

6. A plug valve with a switching structure according to claim 5, characterized in that: A plurality of limiting grooves (12) are provided in an annular manner along the axis of each transfer shaft (11), and a plurality of limiting strips (14) are provided in an annular manner along the axis of each transfer sleeve rod (13). The plurality of limiting grooves (12) correspond to the plurality of limiting strips (14) in a one-to-one manner and are slidably matched. A limiting ring (19) is fixedly provided on each limiting bracket (6), and a rotating ring (20) is rotatably provided on each limiting ring (19). A limiting spring (21) is provided on each rotating ring (20), and one end of the limiting spring (21) is connected to the rotating ring (20), and the other end is connected to the bearing ring (15). The elasticity of the limiting spring (21) close to the transfer chuck (42) is greater than the elasticity of the limiting spring (21) close to the connection chuck (10).

7. The plug valve with a switching structure according to claim 6, characterized in that: The switching mechanism further comprises two limit supports (30) fixedly arranged on the installation box (38), a transmission tube (31) rotatably arranged on the two limit supports (30), a threaded rod (33) rotatably arranged in the transmission tube (31) by means of a thread, a contact inclined block (34) fixedly arranged on an end of the threaded rod (33) away from the transmission tube (31), an adapter plate (35) fixedly arranged on one side of the contact inclined block (34), and a guide rod (36) fixedly arranged on the adapter plate (35), wherein the guide rod (36) penetrates the limit supports (30) and is slidably matched with the limit supports (30), a torsion countersunk hole (32) is provided at the end of the transmission tube (31), and a contact inclined surface (26) is provided on the side wall of the supporting bracket (24).

8. The plug valve with a switching structure according to claim 7, characterized in that: A sliding rheostat (29) is arranged beside the mounting bracket (27), and a toggle plate (37) is fixedly arranged on the contact inclined block (34). One end of the toggle plate (37) is fixedly connected to the contact inclined block (34), and the other end is fixedly connected to the sliding piece of the sliding rheostat (29).

9. A method for switching a plug valve with a switching structure, comprising a plug valve with a switching structure according to claims 1 to 8, characterized in that: The following steps are involved: S1: When the device is operating normally, the first magnet (25) and the second magnet (28) are energized, so that the first magnet (25) and the second magnet (28) attract each other, so that the connecting chuck (16) and the connecting chuck (10) which are closer to the connecting shaft (9) are stuck together, and at this time, the rotation of the valve core (2) can be controlled by starting and stopping the reduction motor (8); S2: When a power outage occurs, the device is in a power-off state, the first magnet (25) and the second magnet (28) no longer have magnetism, and under the action of the limit spring (21), the connecting chuck (16) and the transfer chuck (42) that are closer to the emergency shaft (40) are clamped together, and then the plug valve can be manually controlled through the emergency shaft (40); S3: When the reduction motor (8) fails, there is still electricity in the device, and the first magnet (25) and the second magnet (28) are still attracted together. At this time, the threaded rod (33) is extended by twisting the transmission tube (31), and then the contact inclined block (34) is driven to be inserted between the bearing bracket (24) and the mounting bracket (27), forcibly separating the first magnet (25) and the second magnet (28), so that the transfer chuck (42) and the connecting chuck (16) closer to the transfer chuck (42) are stuck together, and then the plug valve can be manually controlled through the emergency shaft rod (40).

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