CN114743823B - Three-station switch operating mechanism - Google Patents

Abstract

The invention provides a three-station switch operating mechanism, which comprises: a frame; the output end of the driving motor is provided with a driving gear; one end of the screw rod is provided with a first gear meshed with the driving gear; the nut sliding block is in threaded connection with the screw rod, and a guide structure is arranged on the frame; the first chain wheel is directly or rotatably arranged on the frame through a first rotating shaft; the second chain wheel is directly or rotatably arranged on the frame through a second rotating shaft; the chain is arranged on the first sprocket and the second sprocket, and is fixed with the nut sliding block so as to drive the first sprocket and the second sprocket to rotate when the nut sliding block moves left and right; a first output structure is arranged on the first sprocket or the first rotating shaft; and/or a second output structure is arranged on the second chain wheel or the second rotating shaft; the nut sliding block is provided with an extending structure which extends out of the frame to facilitate observation. The extending structure moves along with the nut sliding block in a left-right direction and corresponds to the direct movement of the three-position switch moving contact, so that the position of the three-position switch moving contact can be intuitively judged outside the frame.

Description

A three-position switch operating mechanism

technical field

The invention relates to the technical field of operating mechanisms, in particular to an operating mechanism for a three-position switch.

Background technique

The direct-acting three-position switch of the inflatable cabinet is installed in the airtight air box, and the operating mechanism is located outside the air box, so that the operating mechanism itself cannot directly follow the position of the three-position switch moving contact, but through gears, Worm gear transmission converts linear transmission into circular motion, and doing so leads to common problems—it cannot directly display the position of the moving contact of the three-position switch, it is almost blind operation, and it is difficult to adapt to the strict and complicated "five-proof" joint Lock and "new 18 countermeasures" requirements, so an operating mechanism that can visually display the position of the moving contact of the three-position switch in the mechanism outside the cabinet is needed.

Contents of the invention

The purpose of the present invention is to provide an operating mechanism for a three-position switch that can visually judge the position of the moving contact of the three-position switch.

In order to achieve the above purpose, the three-position switch operating mechanism in the present invention adopts the following technical scheme:

A three-position switch operating mechanism, comprising:

frame;

The driving motor is installed on the frame, and the output end of the driving motor is equipped with a driving gear;

A lead screw is rotatably mounted on the frame, and a first gear is installed at one end of the lead screw, and the first gear is meshed with the driving gear for transmission, defining the rotation axis of the lead screw to extend along the left and right directions;

The nut slider is threaded on the lead screw, and the frame is provided with a guide structure for guiding the nut slider, so that the nut slider moves left and right along the lead screw when the lead screw rotates;

The first sprocket is directly rotatably mounted on the frame or is rotatably mounted on the frame with a first rotating shaft, the first sprocket is fixedly mounted on the first rotating shaft, and the rotation axis of the first sprocket extends along the front-rear direction;

The second sprocket is directly rotatably mounted on the frame or the frame is rotatably mounted with a second rotating shaft, the second sprocket is fixedly mounted on the second rotating shaft, and the rotation axis of the second sprocket also extends along the front-to-back direction. And the second sprocket is spaced apart from the first sprocket left and right;

The chain is installed on the first sprocket and the second sprocket, and the chain is fixedly connected with the nut slider to drive the chain to rotate when the nut slider moves left and right, thereby driving the first sprocket and the second sprocket to rotate;

Wherein, the first sprocket or the first rotating shaft is provided with a first output structure for outputting the torque of the three-position switch operating mechanism; and/or, the second sprocket or the second rotating shaft is provided with a three-position The second output structure for outputting the torque of the position switch operating mechanism;

Wherein, the nut slider is provided with a protruding structure for protruding out of the frame to facilitate observation.

The beneficial effect of the above-mentioned technical solution is that: the drive gear installed at the output end of the driving motor meshes with the first gear at one end of the lead screw, which can drive the lead screw to rotate. Since the nut slider and the lead screw form a lead screw nut mechanism, so the Rotation can drive the nut slider to move left and right, because the nut slider is fixedly connected with the chain, so it can drive the chain to rotate, and then drive the first sprocket and the second sprocket to rotate; The first output structure for outputting the torque of the three-position switch operating mechanism, and/or, the second sprocket or the second rotating shaft is provided with a second output structure for outputting the torque of the three-position switch operating mechanism In this way, the torque of the three-position switch operating mechanism can be output through the first output structure and/or the second output structure, so that the three-position switch movable contact can be moved to realize isolation, grounding and conduction of the three positions switch between.

At the same time, since the nut slider is provided with a protruding structure for extending out of the frame for easy observation, the position of the protruding structure represents the position of the nut slider, and the position of the nut slider reflects the rotation form of the chain. The rotation corresponds to the rotation angle of the first output structure and/or the second output structure, so it corresponds to the position of the moving contact of the three-position switch, whether it is in isolation, grounding, or conduction .

Therefore, by observing the position of the protruding structure outside the frame, the position of the moving contact of the three-position switch can be judged, and the protruding structure moves directly with the nut slider left and right, and the position of the moving contact of the three-position switch One-to-one correspondence of direct action, the judgment is very intuitive.

Further, in order to facilitate the setting of the frame and the installation of the first sprocket and the second chain, the frame includes a first mounting plate, the first mounting plate is located on the rear side of the lead screw, and the first sprocket and the second sprocket are both Installed on the first mounting plate.

Further, in order to facilitate the torque output and facilitate the observation and movement of the protruding structure, the frame also includes a second mounting plate, the second mounting plate is located on the front side of the lead screw, and the front ends of the first rotating shaft and the second rotating shaft And the protruding structures all pass through the second mounting plate, and the perforations on the second mounting plate for the protruding structures to pass through are elongated holes extending left and right.

Further, in order to simplify the form of the protruding structure and facilitate manufacturing, the protruding structure is a protruding shaft fixed on the nut slider, and the axis of the protruding shaft extends along the front-rear direction.

Furthermore, in order to keep the three-position switch at the corresponding position when the extension shaft moves to the right position, three travel switches arranged at intervals from left to right are fixed on the second mounting plate, and the three travel switches correspond to the three-position switches respectively. The isolation station, the conduction station and the grounding station, the three travel switches are set on the upper side or the lower side of the long hole and are respectively electrically connected to the drive motor, so as to be triggered when the extension shaft moves to the corresponding position, And then control the power-off of the drive motor.

Further, in order to facilitate the manual control of the operating mechanism when there is a lack of power, a second gear is installed on the other end of the lead screw, and an input gear meshing with the second gear is installed on the frame. The input gear is used to manually drive the rotation .

Further, in order to facilitate manual control of the operating mechanism when power is lacking, and to facilitate manual operation, the other end of the lead screw is equipped with a second gear, and the first mounting plate is also equipped with a manual input shaft whose rotation axis extends along the front and rear directions. An input gear is installed on the manual input shaft, the input gear and the second gear mesh transmission and both are bevel gears, and the front end of the manual input shaft passes through the second mounting plate.

Further, for the convenience of rotation, the first rotating shaft, the second rotating shaft and the manual input shaft are respectively rotatably mounted on the second mounting plate through bearings.

Further, in order to know the operating state of the three-position switch operating mechanism more conveniently, the three-position switch operating mechanism also includes a first auxiliary switch and a second auxiliary switch installed on the second mounting plate, and the nut slider is located on the The middle position of the lead screw corresponds to the isolation position of the three-position switch, and when it is located at the left and right ends of the lead screw, it corresponds to the conduction position and the grounding position of the three-position switch respectively. The first auxiliary switch and the second auxiliary switch are respectively It is arranged at the left and right ends of the second mounting plate, the connecting shaft of the first auxiliary switch is connected with the first crank arm, the first connecting plate is hinged on the first crank arm, and the connecting shaft of the second auxiliary switch is connected with the second The crank arm, the second connecting plate is hinged on the second crank arm, and the second mounting plate is respectively provided with a guide structure for guiding the left and right movement of the first connecting plate and the second connecting plate, and the three-position switch operating mechanism It also includes a first spring with one end fixedly connected to the second mounting plate and the other end connected to the first connecting plate. The three-position switch operating mechanism also includes one end fixedly connected to the second mounting plate and the other end connected to the second The second spring on the second connecting plate, the first connecting plate and the second connecting plate are respectively provided with matching structures for pushing and cooperating with the nut sliding block when the nut sliding block moves in place.

Further, in order to facilitate the installation of the first spring and the second spring, both the first spring and the second spring are springs with hooks at both ends, the second mounting plate is fixed with a hanging shaft, and one end of the first spring and the second spring Hook on the hanging shaft respectively.

Description of drawings

Fig. 1 is the perspective view of three-position switch operating mechanism among the present invention;

Fig. 2 is the front view of the three-position switch operating mechanism in the present invention;

Fig. 3 is the left view of the three-position switch operating mechanism in the present invention;

Fig. 4 is a perspective view of the transmission part in the three-position switch operating mechanism of the present invention;

Fig. 5 is a front view of the transmission part of the three-position switch operating mechanism of the present invention.

In the figure: 1-first mounting plate; 2-second mounting plate; 201-long hole; 3-driving motor; 4-driving gear; 5-first gear; 6-lead screw; 7-nut slider; 8 -extended shaft; 9-first sprocket; 10-second sprocket; 11-chain; 12-first bearing seat; 13-second bearing seat; 14-input gear; 15-second gear; 16- 17-second rotating shaft; 18-manual input shaft; 19-first travel switch; 20-second travel switch; 21-third travel switch; 22-first auxiliary switch; 23-first crank arm ; 24-the first connecting plate; 241-the first bending plate; 25-the first guide stud; 26-the first spring; - the second connecting plate; 301 - the second bending plate; 31 - the second crank arm.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention, that is, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that relative terms such as the terms "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The characteristics and performance of the present invention will be described in further detail below in conjunction with the examples.

An embodiment of the three-position switch operating mechanism among the present invention is shown in Figure 1, comprises frame, and frame comprises first installation board 1 and second installation board 2, and first installation board 1 is positioned at the second installation board 2 rear side. As shown in Fig. 1, Fig. 3 and Fig. 4, the first mounting plate 1 is U-shaped as a whole. A drive motor 3 is installed in the U-shaped groove on the first mounting plate 1 , and a drive gear 4 is installed at the output end of the drive motor 3 .

As shown in Fig. 4 and Fig. 5, the first bearing seat 12 and the second bearing seat 13 separated from the left and right are fixed on the front side of the first mounting plate 1, and the first bearing seat 12 and the second bearing seat 13 are rotatably installed. There is a lead screw 6 whose rotational axis extends in the left-right direction. The left end of leading screw 6 is equipped with first gear 5, and first gear 5 is meshed transmission with drive gear 4, to drive leading screw 6 to rotate by driving motor 3. In order to facilitate manual control when lacking electric power, a second gear 15 is installed on the right end of the lead screw 6, and an input gear 14 whose rotation axis extends in the front-to-back direction is installed on the first mounting plate 1, and the input gear 14 and the second gear 15 Mesh transmission and both are bevel gears, and the input gear 14 is used for manually driving and rotating.

As shown in Figure 4 and Figure 5, a nut slider 7 is threadedly connected to the lead screw 6, and a guide structure (not shown) for guiding the nut slider 7 is provided on the first mounting plate 1, the guide structure The specific form can be varied, for example, a guide rail can be provided on the nut slider 7, and a guide groove can be provided on the first mounting plate 1. In this way, the nut slider 7 and the leading screw 6 form a screw nut mechanism, so that the nut slider 7 can move left and right along the leading screw 6 when the leading screw 6 rotates. The nut slider 7 is also provided with a protruding structure for extending to the outside of the frame to facilitate observation. The protruding structure in this embodiment is the protruding shaft 8 fixed on the nut slider 7, and the protruding shaft 8 The axis extends in the front-rear direction.

As shown in FIG. 1, FIG. 2 and FIG. 3, a first rotating shaft 16 is installed on the first mounting plate 1 for rotation, and a first sprocket 9 is installed on the first rotating shaft 16 to prevent rotation. As shown in FIG. 4 and FIG. 5, The rotation axis of the first sprocket 9 extends in the front-rear direction. On the first mounting plate 1, a second rotating shaft 17 is also rotatably installed, and a second sprocket 10 is fixedly installed on the second rotating shaft 17, and the rotation axis of the second sprocket 10 also extends along the front-to-back direction, and the second sprocket 10 It is spaced apart from the first sprocket 9 left and right. A chain 11 is installed on the second sprocket 10 and the first sprocket 9, and the chain 11 is fixedly connected with the nut slider 7 to drive the chain 11 to rotate when the nut slider 7 moves left and right, thereby driving the first sprocket 9 and the second sprocket 9. Two sprockets 10 rotate.

As shown in Fig. 1, Fig. 2 and Fig. 3, the second mounting plate 2 is positioned at the front side of the leading screw 6, and the overall shape of the second mounting plate 2 comprises a U-shaped plate and is connected on the lower side of the U-shaped plate and The connecting edge extends downwards, so the second mounting plate 2 has a U-shaped groove with the notch facing backward and a right-angle groove facing forward.

The front end of the first rotating shaft 16, the second rotating shaft 17, the manual input shaft 18 and the front end of the extension shaft 8 all pass through the second mounting plate 2, and the perforations for the extension shaft 8 on the second mounting plate 2 extend left and right. The elongated hole 201 is provided to facilitate the left and right movement of the shaft 8. As shown in Figure 1 and Figure 2, the words "conduction", "isolation" and "grounding" are marked on the second mounting plate 2, and when the nut slider 7 is located in the middle of the lead screw 6, it corresponds to a three-position switch When the isolation station is located at the left and right ends of the lead screw 6, it corresponds to the conduction station and the ground station of the three-position switch respectively. Therefore, for the extension shaft 8, when the extension shaft 8 is located in the middle of the long hole 201 position, it means that the three-position switch is in the isolation position; when it is at the left end, it means that the three-position switch is in the conduction position; when it is in the right end, it means that the three-position switch is in the grounding position.

The first rotating shaft 16, the second rotating shaft 17 and the manual input shaft 18 are respectively mounted on the second mounting plate 2 through bearing rotation, and the front end of the first rotating shaft 16 forms a shaft for outputting the torque of the three-position switch operating mechanism. The first output structure, the front end of the second rotating shaft 17 forms the second output structure for outputting the torque of the three-position switch operating mechanism, the first output structure and the second output structure are connected with the three-position switch movable contact transmission Cooperate to make the moving contact of the three-position switch move, and realize the switching among the three positions of isolation, grounding and conduction. The front end of the manual input shaft 18 is used for cooperating with the crank handle, so that the input gear 14 is manually driven to rotate conveniently.

The first travel switch 19, the second travel switch 20, and the third travel switch 21 arranged at three left and right intervals are also fixed on the second mounting plate, and the three travel switches correspond to the conduction station and the isolation station of the three-position switch respectively. As well as the grounding station, three travel switches are arranged on the upper side of the long hole 201 and are respectively electrically connected with the drive motor 3, so as to be triggered when the extension shaft 8 moves to a corresponding position, and then control the power-off of the drive motor 3, so that The three-position switch remains in the corresponding position.

As shown in Figure 1, Figure 2 and Figure 3, the three-position switch operating mechanism also includes a first auxiliary switch 22 and a second auxiliary switch (not shown in the figure) installed on the second mounting plate 2, the first The auxiliary switch 22 and the second auxiliary switch are located at the rear side of the bottom connecting edge of the second installation board 2 , and the first auxiliary switch 22 and the second auxiliary switch are respectively arranged at the left and right ends of the second installation board 2 .

The connecting shaft of the first auxiliary switch 22 is connected with the first crank arm 23, the first connecting plate 24 is hinged on the first crank arm 23, and the second crank arm 31 is connected with the connecting shaft of the second auxiliary switch. A second connecting plate 30 is hinged on the arm 31, and guide structures for guiding the left and right movement of the first connecting plate 24 and the second connecting plate 30 are respectively provided on the second mounting plate 2. In this embodiment, the guiding structure It is the first guide stud 25 and the second guide stud 29, the first guide stud 25 is fixed on the second mounting plate 2 and passes through the long hole on the first connecting plate 24, and the second guide stud 29 is also fixed On the second mounting plate 2 and through the long hole on the second connecting plate 30 .

The three-position switch operating mechanism also includes a first spring 26 with one end fixedly connected to the second mounting plate 2 and the other end connected to the first connecting plate 24. The three-position switch operating mechanism also includes one end fixedly connected to the second mounting plate 24. On the second mounting plate 2 , the other end is connected to the second spring 28 on the second connecting plate 30 . Specifically, both the first spring 26 and the second spring 28 are springs with hooks at both ends, the second mounting plate 2 is fixed with a hanging shaft 27, and one end of the first spring 26 and the second spring 28 is respectively hooked on the hanging shaft 27, the other end is respectively hooked on the corresponding connecting plate, so the connecting plate is bent to form a hooking edge (not marked in the figure).

The first connecting plate 24 and the second connecting plate 30 are respectively provided with matching structures for pushing and fitting with the nut slider 7 when the nut slider 7 moves into place. Specifically, as shown in FIGS. 2 and 3 , the first The matching structure on the connecting plate 24 is the first bent plate 241, the first bent plate 241 passes through the second mounting plate 2 and extends into the left end of the lead screw 6, when the nut slider 7 moves to the left end, it will push the The first bending plate 241 moves to the left, and then the connecting shaft of the first auxiliary switch 22 is rotated through the first crank arm 23, and the first auxiliary switch 22 is turned on, so that the operating mechanism of the three-position switch can be easily known through the electrical control system operating status. In the process of the first bending plate 241 moving to the left, the first spring 26 is stretched, so as to provide reset power for the reset of the first auxiliary switch 22 . Similarly, the matching structure on the second connecting plate 30 is a second bent plate 301, and the second bent plate 301 passes through the second mounting plate 2 and extends into the right end of the lead screw 6, and moves to the right end of the nut slider 7 When pushing and cooperating with it, its principle is identical with the first auxiliary switch 22.

When the three-position switch operating mechanism in the present invention is in use, because the position of the extension shaft 8 represents the position of the nut slider 7, the position of the nut slider 7 reflects the rotation form of the chain 11, and the rotation of the chain 11 corresponds to is the rotation angle of the first rotating shaft 16 and the second rotating shaft 17, and therefore corresponds to the position of the moving contact of the three-position switch, whether it is in isolation, grounding, or conduction. Therefore, by observing the position of the extension shaft 8 outside the frame, the position of the movable contact of the three-position switch can be judged, and the extension shaft 8 moves directly with the nut slider 7 left and right, and is in contact with the movable contact of the three-position switch. The straight movement of the head corresponds one by one, and the judgment is very intuitive.

The present invention adopts the transmission design combining the screw nut and the sprocket chain, and converts the rotational motion between the gears on the existing operating mechanism into the linear motion of the nut slider 7, which not only realizes the simplification of the structure, but also effectively reduced costs. Simultaneously, the present invention makes full use of the shape of two mounting plates to carry out the layout of parts, for example parts such as the first crank arm, the first connecting plate, the first spring, the second spring, the second connecting plate and the second crank arm all Arranged in the right-angle groove, the overall structure is relatively compact, the transmission parts and the overall size are reduced, and the structure is simplified. Moreover, three travel switches are set to ensure that the three-position switch remains in the corresponding position, and two auxiliary switches are set to know the position of the operating mechanism and the three-position switch from the electrical control. In addition, two A bearing seat can also mechanically limit the nut slider 7, so as to realize non-position operation and high flexibility.

In other embodiments of the three-position switch operating mechanism, two hanging shafts can be fixed on the second mounting plate for the two spring hooks respectively, or no hanging shafts can be installed vertically on the second mounting plate. Fix a fixed plate, weld and fix one end of the first spring and the second spring on the fixed plate respectively, or connect the first connecting plate with the right end of the first spring, and fix a spring seat on the second mounting plate, The left end of the first spring is enclosed within on the spring seat, and now when the first connecting plate moves to the left, the first spring is compressed, and the setting form of the second spring is the same as that of the first spring.

In other embodiments of the three-position switch operating mechanism, the guide structure used to guide the first connecting plate and the second connecting plate on the second mounting plate may not be a guide stud, but a guide structure between the first connecting plate and the second connecting plate. The second connecting plate itself is provided with a guide rail, and a corresponding guide groove is provided on the second mounting plate.

In other embodiments of the three-position switch operating mechanism, the matching structure provided on the first connecting plate and the second connecting plate for push-fitting with the nut slider when the nut slider moves into place may not be integrally connected The bent plate is a baffle or a stopper that is fixedly connected to the connecting plate alone.

In other embodiments of the three-position switch operating mechanism, the first auxiliary switch and the second auxiliary switch may not be provided.

In other embodiments of the three-position switch operating mechanism, without affecting the rotation output, the first rotating shaft, the second rotating shaft and the manual input shaft can only pass through the second mounting plate without installing bearings.

In other embodiments of the three-position switch operating mechanism, the rotation axis of the input gear can also extend along the left and right directions. At this time, both the input gear and the second gear are spur gears, and it only needs to be installed on the first mounting plate to facilitate installation. Manually input the installation structure of the shaft.

In other embodiments of the three-position switch operating mechanism, the second gear and the input gear may not be provided, and the operating mechanism does not have a manual control function.

In other embodiments of the three-position switch operating mechanism, the three travel switches can also be arranged on the lower side of the long hole.

In other embodiments of the three-position switch operating mechanism, the travel switch may not be provided, and the three-position switch can be kept in the corresponding position by directly controlling the driving motor.

In other embodiments of the three-position switch operating mechanism, the protruding structure may also be a protruding block or a protruding plate.

In other embodiments of the three-position switch operating mechanism, the first rotating shaft and the second rotating shaft installed on the first mounting plate may not pass through the second mounting plate, that is, the first rotating shaft and the second rotating shaft are relatively short, At this time, it is also necessary to install a first output shaft on the first rotating shaft or the first sprocket, and the first output shaft passes through the second mounting plate to facilitate the transmission and cooperation with the moving contact of the three-position switch. The same needs A second output shaft is fixedly installed on the second rotating shaft or the second sprocket, and the second output shaft passes through the second mounting plate to facilitate transmission and cooperation with the moving contact of the three-position switch.

In other embodiments of the three-position switch operating mechanism, if there is no need to set the travel switch, the auxiliary switch, or the above-mentioned first output shaft and the second output shaft, the second mounting plate may not be set. At this time, the first The rotating shaft or the first sprocket itself directly constitutes the first output structure, and the second rotating shaft or the second sprocket itself directly constitutes the second output structure.

In other embodiments of the three-position switch operating mechanism, the first sprocket and the second sprocket can both be sprockets with their own shafts. At this time, there is no first rotating shaft and second rotating shaft, and the two sprockets pass through The self-contained shaft is directly rotatably mounted on the first mounting plate, while the first sprocket itself directly constitutes the first output structure, and the second sprocket itself directly constitutes the second output structure.

In other embodiments of the three-position switch operating mechanism, the first output structure can only be provided on the first sprocket or the first rotating shaft, that is, the operating mechanism has only one output structure, or only the second sprocket Or a second output structure is set on the second rotating shaft, and the operating mechanism also has only one output structure.

In other embodiments of the three-position switch operating mechanism, the form of the frame is not limited to the form of the first mounting plate, and any frame that can conveniently install the first sprocket and the second sprocket is fine.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. Any equivalent structural changes made by using the description and accompanying drawings of the present invention, All should be included in the protection scope of the present invention in the same way.

Claims (10)

1. A three-position switch operating mechanism, comprising:

a frame;

the driving motor is arranged on the frame, and a driving gear is arranged at the output end of the driving motor;

the screw rod is rotatably arranged on the frame, one end of the screw rod is provided with a first gear, the first gear is meshed with the driving gear for transmission, and the rotation axis of the screw rod is defined to extend along the left-right direction;

the nut sliding block is in threaded connection with the screw rod, and a guide structure for guiding the nut sliding block is arranged on the frame so that the nut sliding block moves left and right along the screw rod when the screw rod rotates;

the first sprocket is directly rotatably mounted on the frame or rotatably mounted on the frame, the first rotating shaft is rotatably mounted on the first rotating shaft, and the rotating axis of the first sprocket extends along the front-rear direction;

the second sprocket is directly rotatably mounted on the frame or rotatably mounted on the frame, a second rotating shaft is rotatably mounted on the second rotating shaft, the rotating axis of the second sprocket also extends along the front-rear direction, and the second sprocket is arranged left and right at intervals with the first sprocket;

the chain is arranged on the first chain wheel and the second chain wheel, and is fixedly connected with the nut sliding block so as to drive the chain to rotate when the nut sliding block moves left and right, and further drive the first chain wheel and the second chain wheel to rotate;

the first chain wheel or the first rotating shaft is provided with a first output structure for outputting the moment of the three-station switch operating mechanism; and/or a second output structure for outputting the torque of the three-station switch operating mechanism is arranged on the second sprocket or the second rotating shaft;

the nut sliding block is provided with an extending structure which is used for extending out of the frame to facilitate observation.

2. The three-position switch operating mechanism of claim 1, wherein the frame includes a first mounting plate, the first mounting plate being located on a rear side of the lead screw, the first sprocket and the second sprocket being mounted on the first mounting plate.

3. The three-position switch operating mechanism according to claim 2, wherein the frame further comprises a second mounting plate, the second mounting plate is located at the front side of the screw rod, the front ends of the first rotating shaft and the second rotating shaft and the extending structure penetrate out of the second mounting plate, and the through holes for the extending structure to penetrate out of are long holes extending left and right.

4. The three-position switch operating mechanism of claim 3, wherein the projecting structure is a projecting shaft fixed to the nut slider, and an axis of the projecting shaft extends in a front-rear direction.

5. The three-position switch operating mechanism according to claim 4, wherein three travel switches are further fixed on the second mounting plate, the travel switches are arranged at intervals left and right, the three travel switches correspond to an isolation position, a conduction position and a grounding position of the three-position switch respectively, and the three travel switches are arranged on the upper side or the lower side of the long hole and are electrically connected with the driving motor respectively so as to be triggered when the extension shaft moves to the corresponding position, and then the driving motor is controlled to be powered off.

6. The three-position switch operating mechanism according to any one of claims 1 to 5, wherein a second gear is mounted at the other end of the screw rod, an input gear meshed with the second gear is mounted on the rack, and the input gear is used for manual driving rotation.

7. The three-position switch operating mechanism according to any one of claims 3 to 5, wherein a second gear is mounted at the other end of the screw rod, a manual input shaft with a rotation axis extending in the front-rear direction is further mounted on the first mounting plate, an input gear is mounted on the manual input shaft in a rotation-stopping manner, the input gear and the second gear are in meshed transmission, the input gear and the second gear are bevel gears, and the front end of the manual input shaft penetrates out of the second mounting plate.

8. The three-position switch operating mechanism of claim 7, wherein the first rotary shaft, the second rotary shaft, and the manual input shaft are rotatably mounted on the second mounting plate via bearings, respectively.

9. The three-position switch operating mechanism according to any one of claims 3 to 5, further comprising a first auxiliary switch and a second auxiliary switch mounted on the second mounting plate, wherein the nut slider is located at the middle position of the screw rod, and an isolation position corresponding to the three-position switch, a conduction position corresponding to the three-position switch and a grounding position corresponding to the three-position switch respectively are located at the left end and the right end of the screw rod, the first auxiliary switch and the second auxiliary switch are respectively arranged at the left end and the right end of the second mounting plate, a first crank arm is connected to a connecting shaft of the first auxiliary switch, a first connecting plate is hinged to the first crank arm, a second crank arm is connected to a connecting shaft of the second auxiliary switch, a second connecting plate is hinged to the second crank arm, a guide structure for guiding the left and right movements of the first connecting plate and the second connecting plate is respectively arranged on the second mounting plate, the three-position switch operating mechanism further comprises a first spring with one end fixedly connected to the second mounting plate and the other end connected to the first connecting plate, the third position switch operating mechanism further comprises a first spring with one end fixedly connected to the second mounting plate and the other end connected to the second connecting plate and the second connecting plate is matched with the nut slider when the second connecting plate and the nut slider are matched.

10. The three-position switch operating mechanism of claim 9, wherein the first spring and the second spring are both springs with hooks at two ends, the second mounting plate is fixed with a hanging shaft, and one ends of the first spring and the second spring are respectively hooked on the hanging shaft.