A plug valve with a switching structure and a switching method thereof

Abstract

The present invention relates to the field of valve technology, and specifically to a plug valve with a switching structure and a switching method thereof. The plug valve with a switching structure comprises a valve body, a valve core and a rotating rod, a support frame, an installation box, a reduction motor, a support seat, an emergency shaft rod and a switching mechanism. The switching mechanism has a switching output end and a connecting output end. The connecting output end has two ends, 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. The device can enable the plug valve to flexibly switch between a manual control mode and an electric control mode as needed, thereby ensuring that the plug valve can be suitable for different working environments.

Description

Technical Field

[0001] The 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 in the shape of a closing piece or a plunger. It is a valve that can be 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] Its valve plug can be cylindrical or conical in shape. In cylindrical valve plug, the channel is generally rectangular; in conical valve plug, the channel is trapezoidal. These shapes make the structure of the plug valve light and compact. It is most suitable for switching and connecting media and for diversion, but it can sometimes be used for throttling, depending on the applicable properties and the erosion resistance of the sealing surface.

[0004] The problem with the prior art 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, a new type of plug valve needs to be designed 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 problems of the prior art.

[0006] In order to solve the problems of the prior art, 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 having a switching output end and a connecting output end, the connecting output end having 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 wheel is coaxially fixed on the rotating rod, and two limit brackets are fixed on the sides of the worm wheel. 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, the worm wheel is meshed 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 fixedly connected to the output shaft of the reduction motor, a connecting chuck coaxially fixedly arranged on the connecting shaft, an adapter chuck coaxially fixedly arranged with the emergency shaft rod, an adapter shaft coaxially fixedly arranged at both ends of the worm gear, an adapter sleeve rod coaxially connected with a key, a bearing ring coaxially fixedly arranged on each adapter sleeve rod, a connecting chuck coaxially fixedly arranged on each bearing ring, a limiting slider fixedly arranged on the installation box and located on one side of the worm gear, a U-shaped plate slidably arranged on the limiting slider, a bearing bracket fixedly arranged on the U-shaped plate, a first magnet fixedly arranged on the bearing bracket, a mounting bracket fixedly arranged on one side of the limiting slider, a second magnet fixedly arranged on the mounting bracket, a connecting cross plate fixedly connected to the U-shaped plate, and a supporting bracket symmetrically fixedly arranged at both ends of the connecting cross plate, and each supporting bracket is rotatably provided with a bearing ring.

[0009] Furthermore, the supporting card frame 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 two switching output ends of the switching mechanism.

[0011] Furthermore, each adapter shaft side wall is provided with a plurality of limit grooves in a ring shape along its axis, and each adapter sleeve inner wall is provided with a plurality of limit strips in a ring shape along its axis. The plurality of limit grooves correspond to the plurality of limit strips 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 installation box, a transmission tube rotatably arranged on the two limit supports, a threaded rod rotatably arranged in the transmission tube, a contact bevel block 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 block, and a guide rod fixedly arranged on the adapter plate, the guide rod passes through the limit supports and slidably cooperates with the limit supports, a torsion countersunk hole is opened at the end of the transmission tube, and a resistance inclined surface is opened on the side wall of the supporting bracket.

[0013] Furthermore, a sliding rheostat is arranged beside the mounting bracket, a toggle plate is fixedly arranged 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:

[0015] S1: When the device is operating normally, the first magnet and the second magnet are energized, so that the first magnet and the second magnet attract each other, so that the connecting chuck and the connecting chuck that are closer to the connecting shaft are stuck together. At this time, the rotation of the valve core can be controlled by starting and stopping the reduction motor;

[0016] 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 transfer chuck closer to the emergency shaft rod are clamped together, and then the plug valve can be manually controlled through the emergency shaft rod;

[0017] S3: When the reduction motor 8 fails, there is still electricity 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 block is driven to be inserted between the bearing 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, and then the plug valve can be manually controlled through the emergency shaft rod.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] Firstly, the device can flexibly switch the plug valve between the manual control mode and the electric control mode according to the needs, so as to ensure that the plug valve can be applied to different working environments;

[0020] Second: This device can automatically switch to manual control mode when the equipment is powered off, and can change the plug valve to manual control mode through the built-in mechanical structure when the reduction motor fails;

[0021] Thirdly, when the device separates the first magnet and the second magnet, a sliding rheostat is provided to increase the resistance value of the sliding rheostat and reduce the current, thereby making the separation process easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment;

[0023] Figure 2 is a three-dimensional structural cross-sectional view of an embodiment;

[0024] Figure 3 is a cross-sectional view of the valve core of the embodiment;

[0025] Figure 4 is a three-dimensional structural schematic diagram of the electric control mode of the embodiment;

[0026] Figure 5 is a schematic diagram of the three-dimensional structure of the manual control mode of the embodiment;

[0027] Figure 6is a three-dimensional structural cross-sectional view of the worm gear in the electronic control mode of the embodiment;

[0028] Figure 7 yes Figure 6 A schematic diagram of the structure enlargement in the middle;

[0029] Figure 8 yes Figure 7 A magnified schematic diagram of the structure at B in the middle;

[0030] Fig. 9 It is a schematic diagram of the three-dimensional structure of the connecting chuck and the connecting chuck of the embodiment;

[0031] Fig.10 is a schematic diagram of the three-dimensional structure of the switching mechanism of the embodiment;

[0032] Fig.11 It is a schematic diagram of the three-dimensional structure of the U-shaped plate of the embodiment.

[0033] 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 rod; 14, limit strip; 15, bearing 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, bearing bracket; 25, first magnet; 26, resisting 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, touching inclined block; 35, adapter plate; 36, guide rod; 37, toggle plate; 38, mounting box; 39, support seat; 40, emergency shaft rod; 41, handle; 42, adapter chuck. DETAILED DESCRIPTION

[0034] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] refer to Figures 1 to 11 :

[0036] A plug valve with a switching structure comprises 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 also 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, and a support seat 39 (such as Figure 4As shown), an emergency shaft rod 40 rotatably arranged in a support seat 39, a handle 41 coaxially fixedly arranged at the end of the emergency shaft rod 40 and a switching mechanism arranged in an installation box 38, the switching mechanism having a switching output end and a connecting output end, the connecting output end having two, one for connecting the reduction motor 8 and the rotating rod 3, and the other for connecting 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.

[0037] When the device is in operation, the reduction motor 8 eventually 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 electrical 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 operates, and the switching output end establishes a connection between the rotating rod 3 and the emergency shaft rod 40, thereby switching the plug valve from the electrical control mode to the manual control mode.

[0038] 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 specifically provided:

[0039] A worm gear 4 is coaxially fixed on the rotating rod 3, and two limit brackets 6 are fixed on the sides 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 meshed 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.

[0040] 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, and then the rotation of the worm 5 drives the worm wheel 4 to rotate, the rotation of the worm wheel 4 drives the rotating rod 3 to rotate, and 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, and then the rotation of the worm 5 drives the worm wheel 4 to rotate, the rotation of the worm wheel 4 drives the rotating rod 3 to rotate, and 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.

[0041] In order to show the detailed structure of the switching mechanism, the following features are also set:

[0042] 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 Fig. 9 As shown), an adapter chuck 42 coaxially connected to the emergency shaft 40 (as shown Figure 7As shown), 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, a limiting slider 22 fixedly arranged on the installation box 38 and located on one side of the worm 5, a U-shaped plate 23 slidably arranged on the limiting 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 limiting 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 is rotatably provided with a bearing ring 15.

[0043] 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.

[0044] The two connecting chucks 16 are two switching output ends of the switching mechanism.

[0045] When the device is in the electric 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, so that under the action of magnetism, the first magnet 25 drives the bearing bracket 24 to approach the mounting bracket 27 until the bearing bracket 24 is in close contact with the mounting bracket 27. When the above-mentioned bearing bracket 24 moves, the bearing 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 bearing ring 15 to move horizontally, thereby driving the adapter sleeve rod 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 rod 40 to be separated from the adapter chuck 42. At this time, the stopcock is in the electric control mode. The transmission relationship in the electric 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 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, and then the rotation of the worm 5 drives the worm wheel 4 to rotate, thereby controlling the rotation of the valve core 2.

[0046] 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 is introduced later), so that the connecting cross plate 18 moves in the opposite direction, causing the connecting chuck 16 and the adapter chuck 42 near the emergency shaft 40 to be stuck together, and the connecting chuck 16 and the connecting chuck 10 near the connecting shaft 9 are separated. 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, and the adapter chuck 42 rotates to drive the connecting chuck 16 to rotate, and the connecting chuck 16 drives the adapter sleeve 13 to rotate, and the adapter sleeve 13 rotates to drive the adapter shaft 11 to rotate, and 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.

[0047] In order to show the detailed connection relationship between the adapter shaft 11 and the adapter sleeve rod 13, the following features are also specifically provided:

[0048] A plurality of limit grooves 12 are provided in a ring shape along the axis line of each adapter shaft 11 on the side wall, a plurality of limit strips 14 are provided in a ring shape along the axis line of each adapter sleeve rod 13 on the inner wall, the plurality of limit grooves 12 correspond to the plurality of limit strips 14 one by one and are slidably matched, a limit ring 19 is fixedly provided on each limit bracket 6, a rotating ring 20 is rotatably provided on each limit ring 19, a limit spring 21 is provided on each rotating ring 20, 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 close to the adapter chuck 42 is greater than the elasticity of the limit spring 21 close to the connecting chuck 10.

[0049] 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 the 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 be normally extended and retracted. 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.

[0050] 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 specifically set:

[0051] The switching mechanism also includes 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 through a thread, and a contact inclined block 34 (such as a contact inclined block 34) fixedly arranged at one end of the threaded rod 33 away from the transmission tube 31. Fig.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 opened at the end of the transmission tube 31, and a contact inclined surface 26 is opened on the side wall of the supporting bracket 24.

[0052] 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, and the threaded rod 33 extends and drives the contact bevel block 34 to be inserted between the supporting bracket 24 and the mounting bracket 27. As the contact bevel block 34 gradually penetrates deeper, the supporting bracket 24 gradually moves away from the mounting bracket 27. In the above process, the guide rod 36 slides adaptively on the limit support 30.

[0053] In order to ensure that the contact ramp 34 can be more easily separated from the first magnet 25 and the second magnet 28, the following features are also specifically provided:

[0054] 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 .

[0055] When the threaded rod 33 drives the touch bevel block 34 to extend along the axis of the transmission tube 31, the touch bevel block 34 drives the toggle plate 37 to move, and the movement of the toggle plate 37 drives the sliding piece 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 touch bevel block 34 between the mounting bracket 27 and the carrier bracket 24, waiting for the equipment failure 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 touch bevel block 34 to reset, and the reset of the touch bevel block 34 drives the sliding piece to reset, ensuring that the current input to the first magnet 25 and the second magnet 28 by the circuit becomes normal.

[0056] A method for switching a plug valve with a switching structure comprises the following steps:

[0057] 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 that 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;

[0058] S2: When power is cut off, 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 adapter chuck 42 closer to the emergency shaft 40 are clamped together, and then the plug valve can be manually controlled through the emergency shaft 40;

[0059] S3: When the reduction motor 8 fails, there is still electricity in the equipment, 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 block 34 is driven to be inserted between the carrier bracket 24 and the mounting bracket 27, so as to forcibly separate the first magnet 25 and the second magnet 28, so that the adapter chuck 42 and the connecting chuck 16 closer to the adapter chuck 42 are stuck together, and then the emergency shaft rod 40 can be used to manually control the stopcock.

[0060] The working principle of the 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 bearing bracket 24 is in close contact with the mounting bracket 27, the bearing bracket 24 moves to drive the U-shaped plate 23 to slide on the limit slider 22, the U-shaped plate 23 moves to drive the connecting cross plate 18 to move, the connecting cross plate 18 moves to drive the two supporting brackets 17 to move, the two supporting brackets 17 move to drive the bearing 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 rod 13 to rotate, the rotation of the adapter sleeve rod 13 drives the adapter shaft 11 to rotate, the rotation of the adapter shaft 11 drives the worm 5 to rotate, and then the rotation of the worm 5 drives the worm wheel 4 to rotate, thereby controlling the rotation of the valve core 2.

[0061] When the equipment fails, Fault 1: the equipment is powered off, at this time 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 transfer 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 2: the reduction motor 8 fails, there is electricity in the equipment circuit, the transmission tube 31 is twisted to cause the threaded rod 33 to extend along the axis of the transmission tube 31, the threaded rod 33 extends and drives the contact bevel block 34 to be inserted between the bearing bracket 24 and the mounting bracket 27, as the contact bevel block 34 gradually goes deeper, the bearing bracket 24 gradually moves away from the mounting bracket 27, the movement of the bearing 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 the 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, and the rotation of the adapter chuck 42 drives the connecting chuck 16 to rotate, and the connecting chuck 16 drives the adapter sleeve rod 13 to rotate, and the rotation of the adapter sleeve rod 13 drives the adapter shaft 11 to rotate, and the rotation of the adapter shaft 11 drives the worm 5 to rotate, and 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.

[0062] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A plug valve with a switching structure, comprising a valve body, a valve core arranged inside the valve body, and a rotating rod coaxially fixedly arranged on the valve core, characterized in that: It also includes a support frame symmetrically fixedly arranged on the valve body, a mounting box fixedly arranged on the support frame, a reduction motor fixedly arranged in the mounting box, a support seat fixedly arranged in the mounting box, an emergency shaft rod rotatably arranged in the support seat, a handle coaxially fixedly arranged at the end of the emergency shaft rod, and a switching mechanism arranged in the mounting box, the switching mechanism having a switching output end and a connecting output end, the connecting output end having two ends, 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 connect the rotating rod with the reduction motor, or to connect the rotating rod with the emergency shaft rod; A worm wheel is coaxially fixed on the rotating rod, and two limit brackets are fixedly arranged on the sides of the worm wheel. The two limit brackets are symmetrically arranged and are both fixedly connected to the installation box. The worm is rotatably arranged on the two limit brackets, and the worm wheel is meshed 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; The switching mechanism also includes a connecting shaft coaxially fixedly connected to the output shaft of the reduction motor, a connecting chuck coaxially fixedly arranged on the connecting shaft, an adapter chuck coaxially fixedly arranged with the emergency shaft rod, an adapter shaft coaxially fixedly arranged at both ends of the worm gear, an adapter sleeve rod coaxially connected with a key connection sleeve on each adapter shaft, a bearing ring coaxially fixedly arranged on each adapter sleeve rod, a connecting chuck coaxially fixedly arranged on each bearing ring, a limiting slider fixedly arranged on the installation box and located on one side of the worm gear, a U-shaped plate slidably arranged on the limiting slider, a bearing bracket fixedly arranged on the U-shaped plate, a first magnet fixedly arranged on the bearing bracket, a mounting bracket fixedly arranged on one side of the limiting slider, a second magnet fixedly arranged on the mounting bracket, a connecting cross plate fixedly connected to the U-shaped plate, and supporting brackets symmetrically fixedly arranged at both ends of the connecting cross plate, and each supporting bracket is rotatably provided with a bearing ring.

2. A plug valve with a switching structure according to claim 1, characterized in that: The supporting card frame and the mounting bracket are both made of magnetic conductive materials, and the first magnet and the second magnet are electromagnets.

3. A plug valve with a switching structure according to claim 2, characterized in that: The two connecting chucks are the two switching output ends of the switching mechanism.

4. A plug valve with a switching structure according to claim 3, characterized in that: A plurality of limit grooves are provided in a ring shape along the axis line of each adapter shaft side wall, a plurality of limit strips are provided in a ring shape along the axis line of each adapter sleeve inner wall, the plurality of limit grooves correspond to the plurality of limit strips one by one and are slidably matched, a limit ring is fixedly provided on each limit bracket, a rotating ring is rotatably provided on each limit ring, a limit spring is provided on each rotating ring, 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.

5. A plug valve with a switching structure according to claim 4, characterized in that: The switching mechanism also includes two limit supports fixedly arranged on the installation box, a transmission tube rotatably arranged on the two limit supports, a threaded rod rotatably arranged in the transmission tube, a contact bevel block 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 block and a guide rod fixedly arranged on the adapter plate, the guide rod passes through the limit supports and slidably cooperates with the limit supports, a torsion countersunk hole is opened at the end of the transmission tube, and a resistance inclined surface is opened on the side wall of the supporting bracket.

6. The plug valve with a switching structure according to claim 4, characterized in that: A sliding rheostat is arranged beside the mounting bracket, a toggle plate is fixedly arranged on the touch inclined block, one end of the toggle plate is fixedly connected to the touch inclined block, and the other end is fixedly connected to the sliding piece of the sliding rheostat.

7. A method for switching a plug valve with a switching structure, comprising the plug valve with a switching structure according to claim 4, characterized in that: The following steps are involved: S1: During operation, the first magnet and the second magnet are energized, so that the first magnet and the second magnet attract each other, so that the connecting chuck and the connecting chuck that are closer to the connecting shaft are stuck 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 first magnet and the second magnet no longer have magnetism. Under the action of the limit spring, the connecting chuck and the transfer 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 fails, it is in the energized state, 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 block is driven to be inserted between the load-bearing bracket and the mounting bracket, forcing the first magnet and the second magnet to be separated, causing the adapter chuck and the connecting chuck closer to the adapter chuck to be stuck together, and then the plug valve can be manually controlled through the emergency shaft.

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