DE202024101190U1 - Limit mechanism and knife switch - Google Patents

Abstract

Limiting mechanism, characterized in that it comprises:
a positioning arrangement (100) comprising a connecting element (101), a fastening element (102), a moving element (103), an adjusting element (104) and a toothing element (105), wherein the fastening element (102) is arranged on one side of the connecting element (101), wherein the moving element (103) is connected to the fastening element (102), wherein the adjusting element (104) is connected to the moving element (103), and wherein the toothing element (105) is arranged on one side of the adjusting element (104).

Description

TECHNICAL AREA

The present utility model relates to the technical field of knife switches, in particular a limit mechanism and a knife switch.

STATE OF THE ART

1. 1. Die Messerklemme kann sich nach längerem Gebrauch lockern, was zu einer Verringerung des Fixierungseffekts des Kontaktmessers führt. Bei einer versehentlichen Berührung durch äußere Kräfte können sich das Kontaktmesser und die Messerklemme leicht voneinander lösen, wodurch der normale Betrieb des Messerschalters beeinträchtigt wird.
2. 2. Der Messerschalter in den Installationsprozess ist in der Regel in mehreren Sätzen von Befestigungsschrauben für seine Befestigung verwendet, in das Personal während der Demontage und Wartung ist umständlich, um das Problem zu betreiben.

Knife switch (also known as knife switch or disconnector) is a relatively simple structure, widely used electrical switch assembly. When the knife switch is in the off state, a clear disconnection can be observed, and the power supply can be effectively cut off. The gate knife switch on the market includes an insulated base, a contact knife bracket, a knife clamp, a contact knife and a contact knife seat, the contact knife bracket and the contact knife seat are mounted on the insulated base, the contact knife is connected to the contact knife bracket by a pivoting connection structure and can be opened and closed with the contact knife seat, the knife clamp can exert a fixing effect on the contact knife when the knife is opened, the contact knife seat is provided with a handling handle to allow the contact knife to be brought into contact with the contact knife seat and the contact knife seat to be separated to realize the switching on and off of circuits by grasping the handling handle. The following problems exist in the current knife switches:

1. 1. The knife clamp may become loose after long-term use, resulting in a reduction in the fixing effect of the contact knife. If accidentally touched by external forces, the contact knife and the knife clamp may easily separate from each other, thereby affecting the normal operation of the knife switch.
2. 2. The knife switch in the installation process is generally used in several sets of mounting screws for its fixing, in the personnel during disassembly and maintenance is inconvenient to operate the problem.

CONTENT OF THE PRESENT INVENTION

1. 1. Das dritte zu lösendes technisches Problem des vorliegenden Gebrauchsmusters besteht daher darin, dass sich die Messerklemme nach längerem Gebrauch lockern kann, was zu einer Verringerung des Fixierungseffekts des Kontaktmessers führt. Bei einer versehentlichen Berührung durch äußere Kräfte können sich das Kontaktmesser und die Messerklemme leicht voneinander lösen, wodurch der normale Betrieb des Messerschalters beeinträchtigt wird. Um die obigen technischen Probleme zu lösen, verwendet das vorliegende Gebrauchsmuster eine folgende technische Lösung: ein Begrenzungsmechanismus und eine Vorrichtung, umfassend eine Positionierungsanordnung, die ein Verbindungselement, ein Befestigungselement, ein Bewegungselement, ein Einstellelement und ein Verzahnungselement umfasst, wobei das Befestigungselement auf einer Seite des Verbindungselements angeordnet ist, wobei das Bewegungselement mit dem Befestigungselement verbunden ist, wobei das Einstellelement mit dem Bewegungselement verbunden ist, und wobei das Verzahnungselement auf einer Seite des Einstellelements angeordnet ist.

The purpose of this section is to outline some aspects of the embodiments of the present utility model and briefly introduce some preferred embodiments. In this section, as well as the summary of the description of the present application and the title of the invention, some simplifications or omissions may be made in order to avoid obscuring the purpose of this section, as well as the summary of the description and the title of the invention and the like, and these simplifications or omissions cannot be used to limit the scope of the present utility model. In view of the problems or problems of the prior art described above, the present utility model is disclosed.

1. 1. Therefore, the third technical problem to be solved by the present utility model is that the knife clamp may become loose after long-term use, resulting in a reduction in the fixing effect of the contact knife. When accidentally touched by external forces, the contact knife and the knife clamp may easily separate from each other, thereby affecting the normal operation of the knife switch. In order to solve the above technical problems, the present utility model adopts a following technical solution: a limiting mechanism and device comprising a positioning assembly including a connecting member, a fixing member, a moving member, an adjusting member, and a gearing member, wherein the fixing member is arranged on one side of the connecting member, wherein the moving member is connected to the fixing member, wherein the adjusting member is connected to the moving member, and wherein the gearing member is arranged on one side of the adjusting member.

As a preferred solution of the limiting mechanism of the present utility model, the connecting element comprises a fixing plate and a rectangular block, wherein the fixing plate is arranged on the top of the connecting element and the rectangular block is arranged on one side of the fixing plate.

As a preferred solution of the limiting mechanism of the present utility model, the rectangular block comprises a cavity, a first spring and a sliding column, wherein the cavity is arranged inside the rectangular block, wherein one end of the first spring is arranged inside the cavity and the other end of the first spring is arranged on a side of the sliding column, wherein the sliding column is slidably fitted into the cavity, and wherein the other side of the sliding column is firmly connected to the fastening element.

As a preferred solution of the limiting mechanism of the present utility model, the fastening element comprises a limiting block, a sliding groove, an engaging strip and a locking groove, wherein two limiting blocks are provided symmetrically along the center line of the fastening element, wherein the sliding groove is continuously arranged on one side of the limiting block, wherein the moving element and the sliding groove are slidably connected, wherein two engaging strips are arranged symmetrically along the center line of the limiting block, wherein the insert strip is arranged on one side of the limiting block, and wherein the locking groove is arranged rectangularly on one side of the engaging strip.

As a preferred solution of the limiting mechanism of the present utility model, the moving member comprises a fixing column, a rotating groove, a rotating shaft, a cam and a hitch rod, wherein two fixing columns are arranged symmetrically along the center line of the moving member, wherein the fixing columns are arranged on one side of the moving member, wherein the rotating groove is arranged on one side of the fixing column, wherein the rotating shaft is rotatably connected to the rotating groove, wherein the cam is arranged on one side of the moving member, and wherein the hitch rod is arranged on one side of the cam.

As a preferred solution of the limiting mechanism of the present utility model, the adjusting member comprises a threaded groove, a threaded shaft, an annular plate and a telescopic rod, wherein the threaded groove is continuously arranged on one side of the adjusting member, wherein the threaded shaft is screwed to the threaded groove, wherein the annular plate is connected to the threaded groove, wherein the annular plate is provided at one end of the threaded shaft, wherein the other end of the threaded shaft is fixedly connected to the rotary shaft, wherein one end of the telescopic rod is arranged on one side of the moving member, wherein the other end of the telescopic rod is arranged on one side of the adjusting member.

As a preferred solution of the limiting mechanism of the present utility model, a locking block is provided on one side of the gear element, wherein the locking block is arranged rectangularly on one side of the gear element, wherein the locking block is in snap-fit connection with the locking groove.

The first useful effect of the present utility model is: through the positioning arrangement, a limiting effect can be exerted on the handling handle of the knife switch to avoid as much as possible the accidental contact which leads to opening of the contact blade and the blade clamp of the knife holder, thereby affecting the normal operation of the knife switch.

2. Therefore, the third technical problem to be solved by the present utility model is that the knife switch in the installation process is generally used in multiple sets of fixing screws for its fixing, in the personnel during disassembly and maintenance is inconvenient to operate the problem.

In order to solve the above technical problems, the present utility model uses a following technical solution: a knife switch comprising a mounting assembly connected to the positioning assembly, the mounting assembly comprising a mounting plate, a knife body and a stop block, the knife body cooperating with the mounting plate, the stop block cooperating with the knife body.

As a preferred solution of the limiting mechanism of the present utility model, the mounting plate comprises a concave block, a positioning plate, a mounting hole and a stop groove, wherein two concave blocks are provided symmetrically along the center line of the mounting plate, wherein the concave block is arranged on one side of the mounting plate, wherein two positioning plates are provided symmetrically along the center line of the mounting plate, wherein the positioning plate is arranged on one side of the mounting plate, wherein the mounting hole is arranged continuously on one side of the positioning plate, wherein the stop groove is arranged on one side of the concave block, and wherein the stop block is in snap-fit connection with the stop groove.

As a preferred solution of the limiting mechanism of the present utility model, the knife body comprises a cover, a groove, a second spring and a limiting groove, wherein two covers are provided symmetrically along the center line of the knife body, wherein the cover is arranged on one side of the knife body, wherein the groove is arranged on one side of the cover, wherein one end of the second spring is arranged within the groove and another end of the second spring is fixedly connected to the stop block, wherein the limiting groove is arranged on a side of the panel, and wherein the limiting groove communicates with the groove, wherein the stop block comprises a slide rod and a sliding block, wherein the slide rod is arranged on a side of the stop block, wherein the slide rod is slidably connected to the limiting groove, wherein the sliding block is arranged on a side of the slide rod.

The first useful effect of the present utility model is: through the mounting arrangement, it enables the personnel to facilitate the disassembly and maintenance process of the knife switch and use it with greater applicability.

BRIEF DESCRIPTION OF THE DRAWINGS

• 1 ist eine integrale schematische Ansicht eines Begrenzungsmechanismus und eines Messerschalters in einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 2 ist eine integrale schematische Ansicht eines Begrenzungsmechanismus und eines Messerschalters in einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters aus einem anderen Blickwinkel;
• 3 ist eine vergrößerte schematische Ansicht einer H-Struktur einer Positionierungsanordnung im Begrenzungsmechanismus in einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 4 ist eine vergrößerte schematische Ansicht einer G-Struktur der Positionierungsanordnung im Begrenzungsmechanismus in einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 5 ist eine geschnittene schematische Strukturansicht eines rechteckigen Blocks der Positionierungsanordnung im Begrenzungsmechanismus in einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 6 ist eine geschnittene schematische Strukturansicht einer Blende der Montageanordnung im Messerschalter in einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters.

In order to explain the technical solution in the embodiments of the present utility model more clearly, the figures to be used in the explanation of the embodiments are briefly introduced below. Obviously, the figures shown below show only some embodiments of the present utility model. The average person skilled in the art can obtain other figures on the basis of the figures without having to do any creative work. Therein show:

• 1 is an integral schematic view of a limit mechanism and a knife switch in an embodiment of the present utility model;
• 2 is an integral schematic view of a limit mechanism and a knife switch in an embodiment of the present utility model from another angle;
• 3 is an enlarged schematic view of an H-structure of a positioning arrangement in the limiting mechanism in an embodiment of the present utility model;
• 4 is an enlarged schematic view of a G-structure of the positioning arrangement in the limiting mechanism in an embodiment of the present utility model;
• 5 is a sectional schematic structural view of a rectangular block of the positioning structure in the limiting mechanism in an embodiment of the present utility model;
• 6 is a sectional schematic structural view of a panel of the mounting structure in the knife switch in an embodiment of the present utility model.

DETAILED DESCRIPTION

In the following, the detailed embodiment of the present utility model is explained in more detail in conjunction with the figures of the description so that the above purpose, features and advantages of the present utility model can be understood more clearly and easily.

In the following explanation, many specific details are set forth in order to make the present utility model fully understandable, but the present utility model may be implemented in ways other than those described herein, and those skilled in the art can make similar derivations without departing from the connotation of the present utility model. Therefore, the present utility model is not limited to the specific embodiments disclosed below.

Second, the present disclosure will be described in detail using schematic diagrams. In describing embodiments of the present disclosure in detail, schematic diagrams illustrating structures of devices and components are partially enlarged according to a non-general proportional scale for the convenience of description. The schematic diagrams are merely illustrative and are not intended to limit the scope of the present disclosure. In addition, in practice, manufacturing involves three-dimensional spatial dimensions: length, width and height.

Third, reference herein to "an embodiment" or "an embodiment" refers to a particular feature, structure, or characteristic that may be included in at least one implementation of the present invention. The appearances of "in an embodiment" in various places in this specification do not refer to the same embodiment, nor to an embodiment that is independent or selectively exclusive from other embodiments.

First embodiment

With reference to 1-5 The present embodiment provides a limiting mechanism comprising a positioning arrangement 100, through which a limiting effect can play on the handling handle of the knife switch in order to avoid as far as possible the accidental contact that leads to an opening of the contact blade and the knife clamp of the knife holder. ters, thereby affecting the normal operation of the knife switch, and which comprises a connecting member 101, a fastening member 102, a moving member 103, an adjusting member 104 and a gearing member 105. Specifically, the fastening member 102 is arranged on one side of the connecting member 101, the moving member 103 is connected to the fastening member 102, the adjusting member 104 is connected to the moving member 103, the gearing member 105 is arranged on one side of the adjusting member 104.

Furthermore, the gear element 101 comprises a fastening plate 101a and a rectangular block 101b, wherein the fastening plate 101a is arranged on the upper side of the connecting element 101 and the rectangular block 101b is arranged on one side of the fastening plate 101a.

Further, the rectangular block 101b includes a cavity 101b-1, a first spring 101b-2, and a sliding column 101b-3, the cavity 101b-1 being disposed within the rectangular block 101b, one end of the first spring 101b-2 being disposed within the cavity 101b-1, and the other end of the first spring 101b-2 being disposed on one side of the sliding column 101b-3, the sliding column 101b-3 being slidably fitted into the cavity 101b-1, and the other side of the sliding column 101b-3 being fixedly connected to the fastening member 102.

Further, the fastening element 101 comprises a limiting block 102a, a sliding groove 102b, an engaging strip 102c and a locking groove 102d, wherein two limiting blocks 102a are provided symmetrically along the center line of the fastening element 102, wherein the sliding groove 102b is arranged continuously on one side of the limiting block 102a, wherein the moving element 103 and the sliding groove 102b are slidably connected, wherein two engaging strips 102c are arranged symmetrically along the center line of the limiting block 102a, wherein the insert strip 102c is arranged on one side of the limiting block 102a, and wherein the locking groove 102d is arranged rectangularly on one side of the engaging strip 102c.

Further, the moving member 103 includes a mounting post 103a, a rotary groove 103b, a rotary shaft 103c, a cam 103d, and a hitch rod 103f, wherein two mounting posts 103a are arranged symmetrically along the center line of the moving member 103, wherein the mounting posts 103a are arranged on one side of the moving member 103, wherein the rotary groove 103b is arranged on one side of the mounting post 103a, wherein the rotary shaft 103c is rotatably connected to the rotary groove 103b, wherein the cam 103d is arranged on one side of the moving member 103, and wherein the hitch rod 103f is arranged on one side of the cam 103d, and wherein the hitch rod 103f can engage the handle of the knife switch.

Further, the adjusting member 104 comprises a threaded groove 104a, a threaded shaft 104b, an annular plate 104c and a telescopic rod 104d, wherein the threaded groove 104a is arranged continuously on one side of the adjusting member 104, wherein the threaded shaft 104b is screwed to the threaded groove 104a, wherein the annular plate 104c is connected to the threaded groove 104a, wherein the annular plate 104c is provided at one end of the threaded shaft 104b, wherein the diameter of the annular plate 104c is larger than the diameter of the threaded shaft 104b, whereby the annular plate 104c can facilitate the driving of the threaded shaft 104b, wherein the other end of the threaded shaft 104b is fixedly connected to the rotary shaft 103c, wherein one end of the telescopic rod 104d is arranged on one side of the moving member 103, wherein the other end of the Telescopic rod 104d is arranged on one side of the adjusting element 104. The telescopic rod 104d is able to exert a limiting effect on the adjusting element 104. By rotating the annular plate 104c clockwise, the locking block 105a can be moved toward the side of the locking groove 102d. By rotating the annular plate 104c counterclockwise, the locking block 105a can be moved to the side away from the locking groove 102d.

Furthermore, a locking block 105a is provided on one side of the gear element 105, wherein one side of the gear element 105 is fixedly connected to one end of the support rod, wherein another end of the support rod is fixedly connected to the adjustment element 104, wherein the locking block 105a is arranged rectangularly on one side of the gear element 105, wherein the locking block 105a is in snap-fit connection with the locking groove 102d, which can have a limiting effect on the moving element 103.

In use, when the sliding column 101b-3 is pulled, the sliding column 101b-3 slides into the cavity 101b-1, drives the first spring 101b-2 to stretch, then pushes the handle of the knife switch upward, and then pushes the moving member 103 so that the inside of the trailer hitch rod 103f is in contact with the handle of the knife switch, and then rotates the annular plate 104c clockwise, and the annular plate 104c drives the Threaded shaft 104b starts to rotate so that the threaded shaft 104b drives the rotary shaft 103c to rotate in the rotary groove 103b, and the threaded shaft 104b and the threaded groove 104a are threaded to drive the telescopic rod 104d to shorten, whereby the locking block 105a on one side of the gear member 105 and the locking groove 102d arranged on one side of the engagement strip 102c are engaged and the moving member 103 is fixed, and the sliding column 103b is released, the first spring 101b-2 is reset and drives the trailer coupling rod 103f to engage with the handling handle of the knife switch so that a limiting effect can play on the handling handle of the knife switch in order to avoid as much as possible the accidental contact that leads to opening of the contact blade and the blade clamp of the knife holder, which will affect the normal operation of the knife switch.

Second embodiment

With reference to 1 , 2 and 6 it is the second embodiment of the present utility model based on the previous embodiment. The present utility model provides a mounting assembly 200 connected to the positioning assembly 100, which enables personnel to facilitate the disassembly and maintenance process of the knife switch and to use it with greater applicability, and which includes a mounting plate 201, a knife body 202 and a stopper block 203.

Specifically, the knife body 202 interacts with the mounting plate 201, whereby the stop block 203 interacts with the knife body 202.

Further, the mounting plate 201 comprises a concave block 201a and a stopper groove 201d, wherein two concave blocks 201a are provided symmetrically along the center line of the mounting plate 201, wherein the concave block 201a is arranged on one side of the mounting plate 201, wherein the stopper groove 201d is arranged on one side of the concave block 201a, and wherein the stopper block 203 is in snap-fit connection with the stopper groove 201d.

Furthermore, the knife body 202 comprises a cover 202a, a groove 202b, a second spring 202c and a limiting groove 202d, wherein two covers 202a are provided symmetrically along the center line of the knife body 202, wherein the cover 202a is arranged on one side of the knife body 202, wherein the groove 202b is arranged on one side of the cover 202a, wherein one end of the second spring 202c is arranged within the groove 202b and another end of the second spring 202c is fixedly connected to the stop block 203, wherein the limiting groove 202d is arranged on one side of the cover 202a, and wherein the limiting groove 202d communicates with the groove 202b, wherein the stop block 203 comprises a slide rod 203a and a push block 203b, wherein the slide rod 203a is arranged on one side of the stop block 203, wherein the slide rod 203a is slidably connected to the limiting groove 202d, wherein the sliding block 203b is arranged on one side of the slide rod 203a.

In use, when it is necessary to attach the knife body 202, the staff slides the two slide blocks 203b on either side of the knife body 202, the slide block 203b drives the slide rod 203a to slide in the restricting groove 202d, and the stop block 203 moves into the groove 202b, so that the second spring 202c is compressed and the bezel 202a is abutted on the inside of the concave block 201a, and the stop groove 201d is connected to the groove 202b by releasing the slide block 203b, and the second spring 202c is reset, thereby driving the stop block 203 to be in snap-fit connection together with the stop groove 201d, so that the knife body 202 can be quickly fixed. When the knife body 202 needs to be disassembled and serviced, the two sliding blocks 203b are each pushed sideways away from the knife body 202 so that the stop block 203 is separated from the stop groove 201d and the knife body 202 can be quickly removed for maintenance.

Third embodiment

With reference to 1 and 2 It is the third embodiment of the present utility model based on the previous embodiment. The present utility model provides a mounting plate 201 of a mounting structure that can facilitate a personnel to firmly mount the mounting plate 201 at a position to be mounted, and which includes a positioning plate 201b and a mounting hole 201c, wherein two positioning plates 201b are provided symmetrically along the center line of the mounting plate 201, wherein the positioning plate 201b is provided on the side of the mounting plate 201, and wherein the mounting hole 201c is continuously arranged on one side of the positioning plate 201b.

During use, personnel can quickly attach the mounting plate 201 to the the location where the knife switch is to be installed.

It is important and should be noted that the structure and arrangement of the present application, which is illustrated in a number of different exemplary embodiments, is merely exemplary. Although only a few embodiments are described in detail in this disclosure, persons referring to this disclosure should readily understand that many adaptations are possible without materially departing from the novel teachings and advantages of the subject matter described in this application (e.g., size, scale, construction, shape and relationship of various elements and parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, changes in color, orientation, etc.). For example, elements that are integrally formed may be comprised of multiple parts or elements, the position of the elements may be reversed or otherwise changed, and the type or number or position of the individual elements may be changed or altered. Therefore, all such adaptations should be included within the scope of the present utility model. The order or sequence of the process or method steps may be changed or rearranged in accordance with alternative embodiments. In the claims, any "device plus function" clause should cover the structures described herein that perform those functions and are not only structurally equivalent but also represent equivalent structures.Without departing from the scope of the present utility model, other substitutions, adaptations, changes and omissions in the construction, operating conditions and arrangement of the exemplary embodiments may be made.Because of this, the present utility model is not limited to a particular embodiment, but extends to a wide range of adaptations that still fall within the scope of the appended claims.

In order to provide a concise description of the exemplary embodiments, not all features of the actual embodiment may be described (i.e., those features that are not relevant to the best mode of carrying out the present invention or those features that are not relevant to practicing the present invention).

It should be understood that during the development of a practical implementation, as in any engineering or design project, a large number of specific implementation decisions may be made. Such a development effort may be complex and time consuming, but to one skilled in the art having the benefit of this disclosure, such development effort would be routine work in design, manufacturing, and production without extensive experimentation.

It should be noted that the above embodiments are only intended to illustrate the technical solution of the present utility model, rather than to limit it. Although the present utility model is explained in more detail in connection with preferred embodiments, those skilled in the art should understand that they can change the technical solutions of the present utility model or substitute them with equivalents without departing from the spirit and scope of the technical solution of the present utility model, and these changes or substitutes with equivalents should be considered to be covered by the scope of the claims of the present utility model.

Claims (10)

Limiting mechanism, characterized in that it comprises: a positioning arrangement (100) comprising a connecting element (101), a fastening element (102), a moving element (103), an adjusting element (104) and a toothing element (105), wherein the fastening element (102) is arranged on one side of the connecting element (101), wherein the moving element (103) is connected to the fastening element (102), wherein the adjusting element (104) is connected to the moving element (103), and wherein the toothing element (105) is arranged on one side of the adjusting element (104). Limiting mechanism according to Claim 1 , characterized in that the connecting element (101) comprises a fastening plate (101a) and a rectangular block (101b), wherein the fastening plate (101a) is arranged on the upper side of the connecting element (101) and the rectangular block (101b) is arranged on one side of the fastening plate (101a). Limiting mechanism according to Claim 2 , characterized in that the rectangular block (101b) comprises a cavity (101b-1), a first spring (101b-2) and a sliding column (101b-3), the cavity (101b-1) being arranged within the rectangular block (101b), one end of the first spring (101b-2) being arranged within the cavity (101b-1) and the other end of the first spring (101b-2) is arranged on one side of the sliding column (101b-3), wherein the sliding column (101b-3) is slidably fitted into the cavity (101b-1), and wherein the other side of the sliding column (101b-3) is fixedly connected to the fastening element (102). Limiting mechanism according to Claim 3 , characterized in that the fastening element (102) comprises a limiting block (102a), a sliding groove (102b), an engaging strip (102c) and a locking groove (102d), wherein two limiting blocks (102a) are provided symmetrically along the center line of the fastening element (102), wherein the sliding groove (102b) is arranged continuously on one side of the limiting block (102a), wherein the moving element (103) and the sliding groove (102b) are slidably connected, wherein two engaging strips (102c) are arranged symmetrically along the center line of the limiting block (102a), wherein the insert strip (102c) is arranged on one side of the limiting block (102a), and wherein the locking groove (102d) is arranged rectangularly on one side of the engaging strip (102c). Limiting mechanism according to one of the Claims 1 - 4 , characterized in that the moving element (103) comprises a fastening column (103a), a rotary groove (103b), a rotary shaft (103c), a cam (103d) and a trailer coupling rod (103f), wherein two fastening columns (103a) are arranged symmetrically along the center line of the moving element (103), wherein the fastening columns (103a) are arranged on one side of the moving element (103), wherein the rotary groove (103b) is arranged on one side of the fastening column (103a), wherein the rotary shaft (103c) is rotatably connected to the rotary groove (103b), wherein the cam (103d) is arranged on one side of the moving element (103), and wherein the trailer coupling rod (103f) is arranged on one side of the cam (103d). Limiting mechanism according to Claim 5 , characterized in that the adjusting element (104) comprises a threaded groove (104a), a threaded shaft (104b), an annular plate (104c) and a telescopic rod (104d), the threaded groove (104a) being arranged continuously on one side of the adjusting element (104), the threaded shaft (104b) being screwed to the threaded groove (104a), the annular plate (104c) being connected to the threaded groove (104a), the annular plate (104c) being provided at one end of the threaded shaft (104b), the other end of the threaded shaft (104b) being fixedly connected to the rotary shaft (103c), one end of the telescopic rod (104d) being arranged on one side of the moving element (103), the other end of the telescopic rod (104d) being arranged on one side of the adjusting element (104). Limiting mechanism according to Claim 4 , characterized in that a locking block (105a) is provided on one side of the toothed element (105), wherein the locking block (105a) is arranged rectangularly on one side of the toothed element (105), wherein the locking block (105a) is in snap-fit connection with the locking groove (102d). Knife switch, characterized in that it comprises a limiting mechanism according to one of the Claims 1 - 7 and a mounting assembly (200) connected to the positioning assembly (100), the mounting assembly (200) comprising a mounting plate (201), a knife body (202) and a stop block (203), the knife body (202) cooperating with the mounting plate (201), the stop block (203) cooperating with the knife body (202). Knife switch after Claim 8 , characterized in that the mounting plate (201) comprises a concave block (201a), a positioning plate (201b), a mounting hole (201c) and a stop groove (201d), wherein two concave blocks (201a) are provided symmetrically along the center line of the mounting plate (201), wherein the concave block (201a) is arranged on one side of the mounting plate (201), wherein two positioning plates (201b) are provided symmetrically along the center line of the mounting plate (201), wherein the positioning plate (201b) is arranged on one side of the mounting plate (201), wherein the mounting hole (201c) is arranged continuously on one side of the positioning plate (201b), wherein the stop groove (201d) is arranged on one side of the concave block (201a), and wherein the stop block (203) is in contact with the stop groove (201d) in Snap-Fit connection is in place. Knife switch after Claim 8 or 9 , characterized in that the knife body (202) comprises a cover (202a), a groove (202b), a second spring (202c) and a limiting groove (202d), wherein two covers (202a) are provided symmetrically along the center line of the knife body (202), wherein the cover (202a) is arranged on one side of the knife body (202), wherein the groove (202b) is arranged on one side of the cover (202a), wherein one end of the second spring (202c) is arranged within the groove (202b) and another end of the second spring (202c) is fixedly connected to the stop block (203), wherein the limiting groove (202d) is arranged on one side of the cover (202a), and wherein the limiting groove (202d) communicates with the groove (202b). nized; wherein the stop block (203) comprises a slide rod (203a) and a push block (203b), wherein the slide rod (203a) is arranged on one side of the stop block (203), wherein the slide rod (203a) is slidably connected to the limiting groove (202d), wherein the push block (203b) is arranged on one side of the slide rod (203a).

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