CN115240998B

CN115240998B - Multifunctional travel switch

Info

Publication number: CN115240998B
Application number: CN202211149582.0A
Authority: CN
Inventors: 谢春霞; 傅胜超; 刘庆猛; 刘文聪
Original assignee: Shandong Bolt Elevator Co ltd
Current assignee: Shandong Bolt Elevator Co ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2022-11-25
Anticipated expiration: 2042-09-21
Also published as: CN115240998A

Abstract

The invention is suitable for the technical field of travel switches, and provides a multifunctional travel switch, which comprises: the trigger signal processing device comprises a working part and a limit part, wherein the working part is used for switching working signals, and the limit part is used for judging a trigger signal of a limit position; the working part comprises a rotating shaft and a sliding rod, and the sliding rod is elastically connected with the bottom shell; the limit portion includes: the limiting shaft is rotatably connected with the bottom shell; the adjusting nut is in threaded connection with the limit shaft, the trigger rod is hinged to the bottom shell, two ends of the first spring are respectively hinged to the trigger rod and the adjusting nut, one end of the hook is connected with the limit shaft through a rope, and the other end of the hook is connected to the tail end of the rocker arm in a hanging mode. Therefore, the invention has simple structure, realizes two functions of working limit and limit by using one travel switch, reduces the using quantity of the travel switches and reduces the labor intensity of workers and the installation difficulty.

Description

Multifunctional travel switch

Technical Field

The invention relates to the technical field of travel switches, in particular to a multifunctional travel switch.

Background

A travel switch is one of position switches (also called limit switches) and is a common low-current master control electrical appliance. The contact of the mechanical motion part is operated by the collision to realize the connection or disconnection of the control circuit, thereby achieving a certain control purpose. Generally, such switches are used to limit the position or stroke of the movement of the machine, so that the moving machine can automatically stop, move in reverse, shift or automatically move back and forth according to a certain position or stroke. In the control circuit of the elevator, the speed of opening and closing the car door, the limit of automatically opening and closing the door, the upper limit protection and the lower limit protection of the car and the like are controlled by utilizing a travel switch.

Due to the limitation of the spatial arrangement of the elevator, the installation position of the travel switch is limited. Two limit travel switches are respectively arranged above and below the elevator frame, the two limit switches are classified according to functions and are divided into a working limit switch and a limit switch, the working limit switch is used for giving a mechanism action in-place signal, and the limit switch is used for preventing the mechanism action from exceeding the design range and causing accidents. Two limit switch need punch many times when the installation, and the installation space in the elevator well is narrow and small, and it is big and intensity of labour is high to punch to cause the installation degree of difficulty many times, and limit switch function singleness simultaneously is the protective measure of taking only for the work limit switch of prevention became invalid.

In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.

Disclosure of Invention

In view of the above-mentioned drawbacks, an object of the present invention is to provide a multifunctional travel switch, which has a simple structure, and realizes two functions of work limit and limit by using one travel switch, thereby reducing the number of travel switches used, and reducing the labor intensity and the installation difficulty of workers.

In order to achieve the above object, the present invention provides a multi-functional stroke switch comprising: the trigger signal processing device comprises a working part and a limit part, wherein the working part is used for switching working signals, and the limit part is used for judging a trigger signal of a limit position;

the working part comprises a rotating shaft and a sliding rod, wherein the sliding rod is elastically connected with a bottom shell, the bottom shell is provided with a plurality of groups of contacts which are arranged in a separated mode, a plurality of metal sheets are fixedly connected onto the sliding rod, and the metal sheets can be communicated with a group of contacts which are arranged in a separated mode;

the limit portion includes: the limiting shaft is rotatably connected with the bottom shell, and a volute spiral spring is arranged between the limiting shaft and the bottom shell; the adjusting nut is in threaded connection with the limit shaft, the trigger rod is hinged to the bottom shell, two ends of the first spring are respectively hinged to the trigger rod and the adjusting nut, one end of the hook is connected with the limit shaft through a rope in a rope connection mode, and the other end of the hook is connected to the tail end of the rocker arm in a hanging mode.

According to the multifunctional travel switch, the contacts are at least three groups, and the trigger rod can trigger one group of the contacts.

According to the multifunctional travel switch, the limit shaft is provided with the wire wheel, the wire wheel is arranged corresponding to the hook, and the wire wheel is used for winding a wire rope.

According to the multifunctional travel switch, the hinged position of the trigger rod is located in the middle of the moving range of the adjusting nut, so that the trigger rod can be stirred when the adjusting nut moves up and down.

According to the multifunctional travel switch, the bottom shell is provided with the limiting protrusions corresponding to the trigger rod, the limiting protrusions are located below the trigger rod, and the rotating angle of the trigger rod is limited.

According to the multifunctional travel switch of the invention, the rocker arm is eccentrically arranged on the rotating shaft, and the limit shaft is positioned obliquely behind the rotating shaft.

According to the multifunctional travel switch, the rocker arm is provided with the guide ring corresponding to the wire rope.

According to the multifunctional travel switch, the two sides of the tail of the hook are provided with the first plate-shaped bulges, and the first plate-shaped bulges are used for limiting the rocker arm.

According to the multifunctional travel switch, the front part of the hook is provided with a second plate-shaped bulge.

The invention comprises the following steps: the trigger signal processing device comprises a working part and a limit part, wherein the working part is used for switching working signals, and the limit part is used for judging a trigger signal of a limit position; the working part comprises a rotating shaft and a sliding rod, wherein the sliding rod is elastically connected with a bottom shell, the bottom shell is provided with a plurality of groups of contacts which are arranged in a separated mode, the sliding rod is fixedly connected with a plurality of metal sheets, and the metal sheets can be communicated with a group of contacts which are arranged in a separated mode; the limit portion includes: the limiting shaft is rotatably connected with the bottom shell, and a volute spiral spring is arranged between the limiting shaft and the bottom shell; the adjusting nut is in threaded connection with the limit shaft, the trigger rod is hinged with the bottom shell, two ends of a first spring are respectively hinged with the trigger rod and the adjusting nut, one end of the hook is in rope connection with the limit shaft through a wire rope, and the other end of the hook is hung at the tail end of the rocker arm; the travel switch has a simple structure, realizes two functions of working limit and limit by using one travel switch, reduces the using number of the travel switches, and needs to drill holes on site when the travel switches are installed, so that the using number of the travel switches is reduced, and the labor intensity and the installation difficulty of workers can be reduced; meanwhile, the trigger piece of the working part and the trigger piece of the limiting part do not interfere with each other and do not influence each other.

Drawings

FIG. 1 is a schematic structural view of the present invention; FIG. 2 is a schematic structural diagram of the bottom case of the present invention; FIG. 3 is a schematic top view of the bottom case of the present invention; FIG. 4 is a bottom view of the bottom case of the present invention; FIG. 5 is a schematic view of a reverse perspective structure of the bottom case of the present invention; FIG. 6 is a schematic cross-sectional view of a portion of the bottom case of the present invention; FIG. 7 is a schematic view of an assembled construction of the limit part of the present invention; FIG. 8 is a perspective view of the limiter of the present invention; FIG. 9 is a schematic structural view of a first operating state of the present invention; FIG. 10 is a schematic structural view of a second operating state of the present invention; FIG. 11 is a schematic structural view of a third operating state of the present invention; FIG. 12 is a schematic view of the hook construction of the present invention; FIG. 13 is a schematic view of the trigger lever of the present invention; in the figure, 1-working part, 11-sliding rod, 12-metal sheet, 13-second spring, 14-rocker arm, 141-guide ring, 15-rotating shaft, 16-guide wheel, 17-torsion spring, 2-limit part, 21-limit shaft, 22-adjusting nut, 23-first spring, 24-trigger rod, 25-volute spring, 26-reel, 27-hook, 271-first plate-shaped bulge, 272-second plate-shaped bulge, 3-angle iron, 100-bottom shell, 101-wiring terminal, 102-contact and 200-protective cover.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "over," and "under" a second feature may be directly or obliquely above the second feature, or may simply mean that the first feature is at a lesser level than the second feature.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Referring to fig. 1 to 8, the present invention provides a multi-functional stroke switch. This multi-functional travel switch includes: the device comprises a working part 1 and a limit part 2, wherein the working part 1 is used for switching working signals, and the limit part 2 is used for judging triggering signals of limit positions; the working part 1 can control the starting and stopping position of the elevator when working normally, when the working part 1 goes wrong, the limit part 2 works, and the elevator is forcibly stopped through an external circuit to play a role in protection. The multifunctional travel switch is provided with the working part 1 and the limit part 2, can realize the functions of 2 conventional travel switches, reduces the using amount of the travel switches and the number of drilled holes during installation, and reduces the installation complexity and labor intensity.

The working part 1 comprises a rotating shaft 15 and a sliding rod 11, the sliding rod 11 is elastically connected with a bottom shell 100, the bottom shell 100 is provided with a plurality of groups of contacts 102 which are arranged in a separated mode, and each contact 102 is externally connected with a binding post 101 and used for being connected with an external lead. The sliding rod 11 is fixedly connected with a plurality of metal sheets 12, and the metal sheets 12 can be communicated with a group of contacts 102 which are arranged separately. The metal sheet 12 may be cast inside the sliding rod 11, or screwed on the sliding rod 11, and the connection state of each metal sheet 12 and the corresponding contact 102 may be determined selectively according to actual needs, and may be a normally closed state or a normally open state. The rotating shaft 15 is fixedly connected with a guide wheel 16, and when the rotating shaft 15 rotates, the guide wheel 16 rotates. The slide bar 11 is elastically connected with the bottom shell 100, the tail end of the slide bar 11 is provided with a second spring 13, the second spring 13 is abutted between the slide bar 11 and the bottom shell 100, the slide bar 11 is abutted on the guide wheel 16 by means of elasticity, the guide wheel 16 is in an irregular shape, the distance from one side of the guide wheel 16 to the axis of the rotating shaft 15 is smaller than the distance from the other side of the guide wheel 16 to the axis of the rotating shaft 15, and the slide bar 11 can move axially when the guide wheel 16 rotates. The movement of the slide 11 enables the metal sheet 12 to change the state of communication with the contacts 102 arranged spaced apart: when the metal sheet 12 is initially in communication with the spaced arrangement of contacts 102, movement of the slide 11 causes the metal sheet 12 to separate from the spaced arrangement of contacts 102 and vice versa. The sliding rod 11 is simultaneously connected with the bottom shell 100 in a sliding manner, so that the moving stability of the sliding rod 11 is ensured, and the contact between the sliding rod 11 and the guide wheel 16 is more reliable. The rotating shaft 15 is fixedly connected with a rocker 14. The rotating shaft 15 provides elasticity through a torsion spring 17, one end of the torsion spring 17 is fixedly connected to the rotating shaft 15, and the other end of the torsion spring 17 abuts against the bottom case 100. The torsion spring 17 provides a bi-directional torsion force. When the external force disappears, the rotating shaft 15 returns to the normal state through the torsion provided by the torsion spring 17, and when the rotating shaft 15 is in the balance state, the sliding rod 11 is at the axial closest distance from the rotating shaft 15.

The limit part 2 includes: the limit shaft 21 is rotatably connected with the bottom case 100, a scroll spring 25 is arranged between the limit shaft 21 and the bottom case 100, when the limit shaft 21 rotates, the scroll spring 25 accumulates force, and when the external force of the limit shaft 21 disappears, the torsion provided by the scroll spring 25 enables the limit shaft 21 to reversely rotate and recover to the original state; the adjusting nut 22 is in threaded connection with the limit shaft 21, and when the limit shaft 21 rotates, the adjusting nut 22 can move up and down; the inner of the bottom shell 100 is provided with a sliding space corresponding to the adjusting nut 22, and the side wall of the sliding space is close to the outer wall of at least one side of the adjusting nut 22, so that when the limit shaft 21 rotates, the adjusting nut 22 can move up and down and rotate in a small range. The trigger lever 24 is hinged to the bottom case 100, the hinge point of the trigger lever 24 is located on one side of the limit shaft 21, the trigger lever 24 can rotate, and referring to fig. 13, the end of the trigger lever 24 is also provided with a metal sheet 12, the metal sheet 12 can communicate with a set of contacts 102 corresponding to the metal sheet 12, and the communication of the set of contacts 102 is used for triggering an emergency stop. The two ends of the first spring 23 are respectively hinged to the trigger rod 24 and the adjusting nut 22, and when the relative position of the upper and lower positions of the adjusting nut 22 and the hinge point of the trigger rod 24 changes, the first spring 23 can rapidly change the position of the trigger rod 24, so that the metal sheet 12 on the trigger rod 24 is communicated with or separated from the set of contacts 102 corresponding to the metal sheet. Meanwhile, the first spring 23 can provide tension for the adjusting nut 22, and the adjusting nut 22 is prevented from rotating greatly in the up-and-down moving process. One end of the hook 27 is connected with the limit shaft 21 through a rope, the other end of the hook 27 is hung at the tail end of the rocker arm 14, the rope is wound on the limit shaft 21, the spiral spring 25 provides certain elastic force, so that the rope provides pulling force for the hook 27, and the hook 27 is hung at the tail end of the rocker arm 14 through the pulling force. With reference to fig. 11, the hook 27 can be hooked to the preset angle 3 on the elevator, so that the hook 27 performs extreme position detection.

Further, there are at least three sets of contacts 102, and the trigger lever 24 can trigger one set of the contacts 102. The trigger lever 24 is used to trigger the set of contacts 102 in the extreme positions, thereby controlling the scram of the overall circuit. The two sets of contacts 102 are controlled by the sliding rod 11 and are normally open contacts and normally closed contacts respectively. The third set of contacts 102 is controlled by the trigger lever 24, which may be normally open contacts or normally closed contacts, typically normally open contacts. The remaining sets of contacts may be adapted as desired.

Further, a reel 26 is arranged on the limit shaft 21, the reel 26 is arranged corresponding to the hook 27, and the reel 26 is used for winding a wire rope. The wire rope is stored in the wire wheel 26, the rotating diameter of the wire rope can be increased through the wire wheel 26, the length of the wire rope is increased, and the distance of the triggering position of the elevator is increased.

Furthermore, the hinged position of the trigger rod 24 is located in the middle of the moving range of the adjusting nut 22, so that the trigger rod 24 can be shifted when the adjusting nut 22 moves up and down. When the three points are not in a straight line, the first spring 23 can drag the trigger rod 24 to rotate, the adjusting nut 22 moves towards one side, and when the adjusting nut 22 crosses the connecting line of the other two points, the trigger rod 24 rotates. The trigger lever 24 is rotated downward to disengage its corresponding contact. When the trigger lever 24 is in a state of being inclined downward, the first spring 23 is contracted to restore its original length, thereby supporting the trigger lever 24 and preventing the trigger lever 24 from being excessively rotated.

Furthermore, the bottom case 100 is provided with a limiting protrusion corresponding to the trigger rod 24, and the limiting protrusion is located below the trigger rod 24 to limit the rotation angle of the trigger rod 24. When the trigger rod 24 rotates downwards, the limiting protrusion limits the trigger rod 24, and prevents the trigger rod 24 from rotating excessively to interfere with the movement of the sliding rod 11.

Further, the swing arm 14 is eccentrically disposed on the rotating shaft 15, and the limit shaft 21 is located obliquely rearward of the rotating shaft 15. The limit shaft 21 does not interfere when the rotating shaft 15 rotates to the maximum angle, which is the maximum angle that the rocker 14 is rotated by the elevator car. When the swing arm 14 contacts the outer wall of the elevator car, the swing arm 14 rotates, and when the swing arm 14 rotates to the maximum angle, the limit shaft 21 is located obliquely rearward of the rotating shaft 15 at a position where it does not interfere with the rotation of the swing arm 14.

Referring to fig. 5, further, the rocker 14 is provided with a guide ring 141 corresponding to the wire rope, the guide ring 141 is fixedly connected to one side of the rocker 14 to avoid interference with movement of the preset angle iron 3 of the elevator car, and the fixing mode may be welding or pin connection. The guide ring 141 can guide the wire and prevent the wire from unintentionally moving while the swing arm 14 rotates. The surface of the guide ring 141 is mirror-finished, so that the guide ring is smooth and has a small friction coefficient, the friction force of the thread rope can be reduced, and the service life of the thread rope is prolonged. The cotton rope can be made of nylon thread, and is moisture-proof and good in strength and toughness. In order to better show the working process of the travel switch and avoid the shielding effect of the guide ring 141 in the drawings, in fig. 9 to 11, a circular ring is used for simple representation.

Referring to fig. 12, further, first plate-shaped protrusions 271 for limiting the swing arm 14 are disposed on two sides of the tail of the hook 27. The first plate-like projection 271 ensures that the hook 27 can be hooked on the end of the swing arm 14.

Further, the front portion of couple 27 is equipped with second platelike arch 272, combines fig. 11, and second platelike arch 272 can the joint on the preset angle bar 3 of elevator box, prevents that couple 27 landing from influencing the detection of extreme position and the safety of elevator.

When the multifunctional travel switch is installed, the multifunctional travel switch is installed at the proper position of the two ends of the elevator track through bolts.

The multifunctional travel switch has two working modes:

a first operating mode: the working part 1 and the limiting part 2 both work normally. Referring to fig. 9 and 10, the working part 1 works normally, the preset angle iron 3 outside the elevator car contacts the rocker 14, the angle iron 3 moves forwards continuously, the rocker 14 is rotated by the angle iron 3, the rocker 14 is rotated by a certain angle in combination with fig. 4, the sliding rod 11 is compressed and moved, the normally closed contact 102 is opened, the normally open contact 102 is closed, signal control is achieved, the running direction of the elevator is changed, the angle iron 3 moves along with the elevator and gradually breaks away from the rocker 14, and when the angle iron 3 completely breaks away from the rocker 14, the working part 1 resets, and the elevator runs normally.

A second working mode: the working part 1 is out of order and the limit part 2 is working normally. Referring to fig. 9 to 11, when the working part 1 fails, the contact 102 controlled by the sliding rod 11 fails, so that the operation of the elevator does not change according to a preset program, the elevator continuously keeps moving upwards or downwards, and the angle iron 3 continuously rotates the rocker 14. Referring to fig. 7 and 8, the angle iron 3 rotates the rocker 14 until the hook 27 on the rocker 14 hooks the angle iron 3, the hook 27 rotates the limit shaft 21 through a rope, and the adjusting nut 22 is forced to rise until the adjusting nut 22 moves above the hinge position of the trigger lever 24. The hinge point of the first spring 23 and the trigger rod 24 is connected with the rotation point of the trigger rod 24 to form a straight line, the adjusting nut 22 moves above the straight line, so that the trigger rod 24 rotates upwards quickly to communicate with a group of contacts 102 for emergency stop, the emergency stop of the elevator is realized, and the safety of the elevator is ensured.

The multifunctional travel switch has two methods for resetting:

1. when the elevator needs to be reset after sudden stop, the elevator reversely moves through an external manual control circuit, at the moment, the hook 27 slowly moves back along with the angle iron 3 and gradually approaches the rocker arm 14, when the hook 27 is quickly close to the tail end of the rocker arm 14, the first plate-shaped protrusions 271 on the two sides of the hook 27 limit the rocker arm 14 between the two first plate-shaped protrusions 271 to play a positioning role, when the angle iron 3 continuously moves until the tail end of the rocker arm 14 is higher than the angle iron 3, the hook 27 is hung at the tail end of the rocker arm 14, the limit shaft 21 gradually rotates under the action of the volute spiral spring 25, the adjusting nut 22 moves downwards, the trigger rod 24 rotates, and the original trigger state is changed; the angle iron 3 continues to move, the rocker 14 gradually resets, and the elevator and the multifunctional travel switch can be normally used.

2. When the working part 1 of the multifunctional travel switch per se has a fault, the travel switch needs to be replaced, the elevator car is moved to a normal working position through an external manual control circuit, then a new travel switch is replaced, and the hook 27 is hung at the tail end of the rocker arm 14.

In summary, the present invention includes: the trigger signal processing device comprises a working part and a limit part, wherein the working part is used for switching working signals, and the limit part is used for judging a trigger signal of a limit position; the working part comprises a rotating shaft and a sliding rod, wherein the sliding rod is elastically connected with a bottom shell, the bottom shell is provided with a plurality of groups of contacts which are arranged in a separated mode, a plurality of metal sheets are fixedly connected onto the sliding rod, and the metal sheets can be communicated with a group of contacts which are arranged in a separated mode; the limit portion includes: the limiting shaft is rotatably connected with the bottom shell, and a volute spiral spring is arranged between the limiting shaft and the bottom shell; the adjusting nut is in threaded connection with the limit shaft, the trigger rod is hinged with the bottom shell, two ends of a first spring are respectively hinged with the trigger rod and the adjusting nut, one end of the hook is connected with the limit shaft through a rope in a rope mode, and the other end of the hook is connected with the tail end of the rocker arm in a hanging mode; the travel switch has a simple structure, realizes two functions of working limit and limit by using one travel switch, reduces the using number of the travel switches, and needs to drill holes on site when the travel switches are installed, so that the using number of the travel switches is reduced, and the labor intensity and the installation difficulty of workers can be reduced; meanwhile, the trigger piece of the working part and the trigger piece of the limiting part do not interfere with each other and do not influence each other.

In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A multi-function travel switch, comprising: the trigger signal processing device comprises a working part and a limit part, wherein the working part is used for switching working signals, and the limit part is used for judging a trigger signal of a limit position;

the rotating shaft provides elasticity through a torsion spring, one end of the torsion spring is fixedly connected with the rotating shaft, the other end of the torsion spring abuts against the bottom shell, the torsion spring provides bidirectional torsion, the rotating shaft rotates when external force is applied, and when the external force disappears, the rotating shaft returns to a normal state through the torsion provided by the torsion spring; the rotating shaft is fixedly connected with a guide wheel, the sliding rod is connected with the bottom shell in a sliding manner, the sliding rod abuts against the guide wheel by virtue of elasticity, the guide wheel is in an irregular shape, the distance from one side of the guide wheel to the axis of the rotating shaft is smaller than the distance from the other side of the guide wheel to the axis of the rotating shaft, and the sliding rod can move axially when the guide wheel rotates; the rotating shaft is fixedly connected with a rocker arm;

the limit portion includes: the limiting shaft is rotatably connected with the bottom shell, and a volute spiral spring is arranged between the limiting shaft and the bottom shell; the adjusting nut is in threaded connection with the limit shaft, the trigger rod is hinged with the bottom shell, two ends of a first spring are respectively hinged with the trigger rod and the adjusting nut, one end of the hook is connected with the limit shaft through a rope in a rope mode, the other end of the hook is connected with the tail end of the rocker arm in a hanging mode,

the wire is wound on the limit shaft; the tail end of the trigger rod is also provided with a metal sheet which can be communicated with a group of contacts corresponding to the metal sheet; when the relative position of the upper position and the lower position of the adjusting nut and the hinge point of the trigger rod is changed, the first spring can rapidly change the position of the trigger rod, so that the metal sheet on the trigger rod is communicated or separated from the group of corresponding contacts.

2. The multi-function travel switch of claim 1, wherein there are at least three sets of contacts, and wherein the trigger bar is capable of triggering one of the sets of contacts.

3. The multifunctional travel switch as claimed in claim 2, wherein a reel is provided on the limit shaft, the reel is provided corresponding to the hook, and the reel is used for winding a cord.

4. The multifunctional travel switch according to any one of claims 1 to 3, wherein the hinged position of the trigger rod is located in the middle of the moving range of the adjusting nut, so that the trigger rod can be toggled when the adjusting nut moves up and down.

5. The multifunctional travel switch of claim 4, wherein the bottom shell is provided with a limiting protrusion corresponding to the trigger rod, and the limiting protrusion is located below the trigger rod and limits the rotation angle of the trigger rod.

6. The multi-function travel switch of claim 5, wherein the rocker arm is eccentrically disposed on the shaft, the limit shaft being located diagonally rearward of the shaft.

7. The multi-function travel switch of claim 6, wherein the rocker arm is provided with guide rings corresponding to the cord.

8. The multifunctional travel switch of claim 7, wherein first plate-shaped protrusions are arranged on two sides of the tail of the hook, and the first plate-shaped protrusions are used for limiting the rocker arm.

9. A multi-function travel switch according to claim 8, wherein the front portion of the hook is provided with a second plate-like projection.