Connecting clamping piece for connecting bottom plate and button base and knob switch

Abstract

The utility model discloses a connecting clamping piece for connecting a bottom plate and a button base and a knob switch, which belong to the technical field of knob switches, and comprise a metal plate, a bottom plate buckle and a base buckle, the bottom plate buckle and the base buckle are fixedly connected with the metal plate, and each of the bottom plate buckle and the base buckle comprises a connecting plate and a clamping plate fixedly connected with the connecting plate. The included angle between the clamping plate and the connecting plate is not greater than 90 degrees; the bottom plate buckle is located at the end, facing the bottom plate, of the metal plate, a first through hole is formed in the bottom plate, and the bottom plate buckle penetrates through the first through hole to be connected with the bottom plate in a clamped mode. The base buckles are located at the end, facing the button base, of the metal plate, at least one pair of oppositely-arranged base buckles are arranged on the metal plate, a clamping table is arranged on the side, back to the metal plate, of the button base, and the base buckles are connected with the clamping table in a clamped mode. Therefore, the button base can be replaced without dismounting the bottom plate of the button base, the operation steps are simplified, and the replacement efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of knob switches, in particular to a connecting clamp for connecting a bottom plate and a button base and a knob switch. Background Art

[0002] The rotary switch is a switch that uses a knob to push the transmission mechanism and uses the on and off of the moving contact and the static contact to achieve circuit switching. It is a widely used master control appliance. In the electrical automatic control circuit, it is used to manually send control signals to control other electrical components to control the circuit to complete specific functions. In power plants, due to high temperature, high pressure and production process control accuracy, many electric actuators are selected for on-site process automation control. The maximum temperature in some working environments can reach about 60° for a long time. For safety reasons, some simple-structured pure mechanical electric actuators are usually selected in these high-temperature environments. The internal space of these electric actuators is limited. Commonly used knob switches include a knob base, a button contact module and a base plate. A connecting column is provided on the knob base. The connecting column passes through the base plate and is threadedly connected to the connecting fasteners on the other side of the base plate to fix the button base on the base plate. Since the connecting fasteners are mostly plastic and the button base integrates a cam, two sets of spring reset mechanisms, and two limit blocks to work together, more plastic parts are easily deformed and damaged at high temperatures. In a high-temperature and high-risk working environment, once the above-mentioned fault occurs and a new knob contact needs to be replaced, the maintenance personnel must first remove the screws used to fix the base plate. After removing the base plate, the button base can be disassembled and installed, and the operation is relatively cumbersome.

[0003] Therefore, in order to solve the problem in the prior art that the operation of replacing the button base is complicated and the replacement efficiency is low, the present application proposes a connecting card and a knob switch between the base plate and the button base. Utility Model Content

[0004] The purpose of the utility model is to address the defects and shortcomings in the prior art and provide a connecting card and a knob switch for connecting the bottom plate and the button base, so that the button base can be replaced without removing the bottom plate of the button base, simplifying the operation steps and improving the replacement efficiency.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The utility model provides a connecting card for connecting a bottom plate and a button base.

[0007] It includes a metal plate and a bottom plate buckle and a base buckle fixedly connected to the metal plate, wherein the bottom plate buckle and the base buckle each include a connecting plate and a clamping plate fixedly connected to the connecting plate, and the angle between the clamping plate and the connecting plate is not greater than 90°;

[0008] The bottom plate buckle is located at one end of the metal plate facing the bottom plate, the bottom plate is provided with a first through hole, and the bottom plate buckle passes through the first through hole to be clamped with the bottom plate;

[0009] The base buckle is located at one end of the metal plate facing the button base, and at least a pair of base buckles arranged opposite to each other are provided on the metal plate. A clamping platform with a thickness matching the clamping thickness of the base buckle is provided on the side of the button base facing away from the metal plate, and the base buckle is clamped with the clamping platform.

[0010] Preferably, the bottom plate buckle includes a limiting buckle and a fixing buckle, the clamping plate of the limiting buckle is vertically arranged relative to its connecting plate, the clamping plate of the fixing buckle is inclined relative to its connecting plate, and the angle between the clamping plate of the fixing buckle and the connecting plate of the fixing buckle is an acute angle.

[0011] Preferably, the angle between the clamping plate of the fixing buckle and the connecting plate of the fixing buckle is 45±5°.

[0012] Preferably, at least one of the base buckles arranged in pair is further provided with a hook structure fixedly connected to the clamping plate.

[0013] Preferably, the opening of the hook-shaped structure faces a side away from the button base, and an angle of the hook-shaped structure is an acute angle.

[0014] The utility model also provides a knob switch, comprising the connection card, the bottom plate, the button base, the button contact module, the operating housing, the mechanical cam, the knob connecting rod and the knob, wherein the operating housing is provided with a second through hole, the knob connecting rod is placed in the second through hole, and one end of the knob connecting rod is connected to the knob, and the other end of the knob connecting rod is connected to the mechanical cam;

[0015] The operating housing has an opening at one end away from the knob, the bottom plate cover is arranged at the opening, the bottom plate is connected to the button base via the connecting card, and the button contact module is arranged at a side of the button base away from the bottom plate;

[0016] A third through hole is provided on the metal plate, and a fourth through hole is provided on the button base. The diameters of the first through hole, the third through hole and the fourth through hole are all larger than the maximum distance between any two points on the outer contour of the knob connecting rod. A toggle protrusion is provided on the end face of the mechanical cam facing the button contact module, and the toggle protrusion is only provided on a part of the end face. A toggle post for use with the toggle protrusion is provided at one end of the button contact module facing the toggle protrusion, and the toggle post is located on the rotation path of the toggle protrusion, and the toggle post and the toggle protrusion are both located in the fourth through hole.

[0017] Preferably, a limiting protrusion is further provided on the bottom plate, and the limiting protrusion is at least located on one side of the limiting buckle, and along the rotation direction of the knob connecting rod, the limiting protrusion is located behind the limiting buckle.

[0018] Preferably, the bottom plate is provided with a limiting protrusion, the metal plate is provided with two limiting buckles, and the limiting buckles are respectively located on both sides of the limiting protrusion;

[0019] The toggle posts are arranged on both sides of the toggle protrusion on the rotation path.

[0020] Preferably, a magnet is further provided on the end surface of the metal plate close to the button base, and the portion of the button base in contact with the metal plate is a metal structure.

[0021] Preferably, the button contact module is fixedly connected to the button base via a threaded connector.

[0022] Compared with the prior art, the utility model has achieved the following technical effects:

[0023] 1. The utility model adopts a connecting card to connect the bottom plate and the button base, so that the base buckle used to fix the button base is located outside the operating shell. When the button base fails, the button base can be replaced without removing the bottom plate of the button base, which simplifies the operation steps and improves the replacement efficiency. The metal connecting card solves the problem that the material is easily aged and damaged in a high temperature, high pressure and dusty working environment, and cannot be repeatedly disassembled and used, which ensures the elasticity, toughness, strength and repeated disassembly and use of the connecting card, and reduces the failure rate of the device.

[0024] Compared with the prior art, other technical solutions of the utility model have achieved the following technical effects:

[0025] 2. The utility model adopts the method of assembling a magnet on the connecting card and setting the part of the button base that contacts the connecting card as a metal structure. Through the adsorption effect of the magnet, the position stability of the connecting card is improved when the connecting card mounts multiple knob contact modules, and the loosening problem of the connecting card due to assembly is eliminated, so that the knob switch has the ability to safely mount high button contacts, and there will be no problem of affecting the quality of the on-site signal due to loose connecting cards, fault displacement, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a schematic diagram of the shaft side structure of the connecting clamp;

[0028] Figure 2 It is a front view structural diagram of the connection card;

[0029] Figure 3 A schematic diagram of the axial structure of the assembly structure connecting the card with the base plate and the button base;

[0030] Figure 4 A schematic diagram of a top view of an assembly structure for connecting a card with a base plate and a button base;

[0031] Figure 5 It is a front view structural schematic diagram of the assembly structure connecting the card, the bottom plate and the button base;

[0032] Figure 6 It is a schematic diagram of the shaft side structure of the mechanical cam;

[0033] Figure 7 It is a structural diagram of the knob switch;

[0034] Figure 8 It is a schematic diagram of the cross-sectional structure at AA;

[0035] Fig. 9 It is a schematic diagram of the cross-sectional structure at BB;

[0036] Fig.10 A schematic diagram of a top view of an assembly structure for connecting a card, a magnet, and a button base;

[0037] Fig.11 It is a schematic diagram of the cross-sectional structure at CC;

[0038] Fig.12Schematic diagram of the assembly structure of the button contact module, mechanical cam and knob connecting rod

[0039] Fig.13 Schematic diagram of the assembly structure of the knob switch.

[0040] Among them, 1. connecting card; 2. metal plate; 3. bottom plate buckle; 4. base buckle; 5. connecting plate; 6. snap plate; 7. bottom plate; 8. button base; 9. first through hole; 10. snap table; 11. limit buckle; 12. fixing buckle; 13. hook structure; 14. button contact module; 15. operating shell; 16. mechanical cam; 17. knob connecting rod; 18. knob; 19. second through hole; 20. third through hole; 21. fourth through hole; 22. toggle protrusion; 23. toggle column; 24. opening groove; 25. snap protrusion; 26. guide surface; 27. limit protrusion; 28. magnet; 29. ​​fifth through hole; 30. cavity; 31. threaded connector. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] like Figures 1 to 2 As shown, the utility model provides a connecting clip 1 for connecting a base plate and a button base, comprising a metal plate 2 and a base clip 3 and a base clip 4 fixedly connected to the metal plate 2, wherein the base clip 3 and the base clip 4 can be formed separately and then fixedly connected to the metal plate 2, such as welding, screwing, etc., or can be integrally formed with the metal plate 2. In the present application, the base clip 3 and the base clip 4 are preferably integrally formed with the metal plate 2, and the base clip 3 and the base clip 4 both include a connecting plate 5 and a clamping plate 6 fixedly connected to the connecting plate 5, and the angle between the clamping plate 6 and the connecting plate 5 is not greater than 90°, so that the clip can be firmly clamped.

[0044] See also Figure 3 The bottom plate buckle 3 is located at one end of the metal plate 2 facing the bottom plate 7. The bottom plate 7 is provided with a first through hole 9. The bottom plate buckle 3 passes through the first through hole 9 and is connected to the bottom plate 7. Preferably, the bottom plate buckle 3 is located in the area of ​​the metal plate 2 corresponding to the edge of the first through hole 9.

[0045] like Figure 8 As shown, the base buckle 4 is located at one end of the metal plate 2 facing the button base 8, at least one pair of base buckles 4 arranged opposite to each other is provided on the metal plate 2, and a clamping platform 10 with a thickness matching the clamping thickness of the base buckle 4 is provided on the side of the button base 8 facing away from the metal plate 2, and the base buckle 4 is clamped with the clamping platform 10; wherein the clamping thickness refers to the thickness of an object that can be firmly clamped by the buckle, and the clamping thickness of the bottom plate buckle 3 is also matched with the thickness of the bottom plate 7.

[0046] Through the above technical solution, the bottom plate 7 can be fixed on the back of the connecting card 1, and the button base 8 can be fixed on the front of the connecting card 1 (i.e., the outside of the operating shell 15), so the button base 8 can be removed only by operating the base buckle 4. Compared with the prior art, which requires first removing the bottom plate 7 to expose the connecting fasteners located in the operating shell 15, and then removing the connecting fasteners to remove the button base, the present application reduces the steps of replacing the button base 8 and greatly improves the replacement efficiency. Among them, two, three or more pairs of base buckles 4 can be set on the metal plate 2, but as the number of base buckles 4 increases, the replacement efficiency of the button base 8 will decrease. Therefore, under the condition of ensuring that the button base 8 can be firmly fixed, the fewer the number of base buckles 4, the better. The present application preferably only sets one pair of base buckles 4 on the metal plate 2.

[0047] like Figure 1 As shown, the bottom plate buckle 3 includes a limit buckle 11 and a fixed buckle 12. The clamping plate of the limit buckle 11 is vertically arranged relative to its connecting plate to reduce the space between the clamping plate and its connecting plate and improve the limit effect. The clamping plate of the fixed buckle 12 is tilted relative to its connecting plate, and the angle formed between the clamping plate of the fixed buckle 12 and its connecting plate is an acute angle (see Figure 2 The angle between the clamping plate and the connecting plate of the fixing buckle 12 is preferably 45±5°. The limit buckle 11 can prevent the metal plate 2 and the button base 8 fixed on the metal plate 2 from rotating.

[0048] When in use, first insert the limit buckle 11 into the first through hole 9, and then press the fixing buckle 12 to insert it into the first through hole 9, so as to complete the connection between the connecting clip 1 and the bottom plate 7. The connecting clip 1 is a metal structure with a certain amount of elastic deformation, which is formed by integral stamping and bending. The metal connecting clip 1 solves the problem that the material is easily aged and damaged in a high temperature, high pressure, and dusty working environment, and cannot be repeatedly disassembled and used, thereby ensuring the elasticity, toughness, strength, and number of times of repeated disassembly and use of the connecting clip 1; compared with the plastic connecting fasteners in the prior art, the present application reduces the maintenance time and failure rate of such faults. As a preferred embodiment of the present application, the material of the connecting clip 1 is spring steel.

[0049] See also Figure 2 At least one of the base buckles 4 arranged in pairs is also provided with a hook structure 13 fixedly connected to the clamping plate. When in use, the hook structure 13 is pulled to increase the angle between the connecting plate and the clamping plate (see Figure 2 The hook structure 13 is more convenient to be installed in the button base 8. For easy operation, the opening of the hook structure 13 faces the side away from the button base 8, and the angle of the hook structure 13 (see Figure 2 The angle of 40° in the middle is an acute angle. When in use, first insert the clamping platform 10 on one side of the button base 8 into the base buckle without the hook structure 13, and then pull the hook structure 13 outward to rotate the clamping plate of the base buckle 4 away from the button base 8, so as to facilitate the clamping platform 10 on the other side of the button base 8 to be clamped into the base buckle. In the present application, preferably, a hook structure 13 is provided on each base buckle.

[0050] like Figure 7-9 As shown, the utility model also provides a knob switch, including a connecting card 1, a bottom plate 7, a button base 8, a button contact module 14, an operating housing 15, a mechanical cam 16, a knob connecting rod 17 and a knob 18. The operating housing 15 is provided with a second through hole 19, the knob connecting rod 17 is placed in the second through hole 19, and one end of the knob connecting rod 17 is connected to the knob 18, and the other end of the knob connecting rod 17 is connected to the mechanical cam 16. The knob 18 is located outside the operating housing 15, and the mechanical cam 16 is located inside the operating housing 15; the operating housing 15 is away from the knob 18. One end of the button 17 is open, and the bottom plate 7 is covered at the opening. The bottom plate 7 is connected to the button base 8 through the connecting clamp 1, and the button contact module 14 is arranged on the side of the button base 8 away from the bottom plate 7; a third through hole 20 is provided on the metal plate 2, and a fourth through hole 21 is provided on the button base 8. The diameters of the first through hole 9, the third through hole 20 and the fourth through hole 21 are all larger than the maximum distance between any two points on the outer contour of the knob connecting rod 17. The end surface of the mechanical cam 16 facing the button contact module 14 is provided with a toggle protrusion 22, and the toggle protrusion 22 is only provided on a part of the end surface (see Figure 6 ), a toggle post 23 is provided at one end of the button contact module 14 facing the toggle protrusion 22, the toggle post 23 is located on the rotation path of the toggle protrusion 22, and the toggle post 23 and the toggle protrusion 22 are both located in the fourth through hole 21.

[0051] When in use, the knob 18 is turned, and the knob 18 drives the mechanical cam 16 to rotate through the knob connecting rod 17, and then the protrusion 22 drives the toggle column 23 to rotate, so that the contact movement of the button contact module 14 can achieve the function of switching the signal on and off. In order to make the knob 18 of the knob switch rotate both clockwise and counterclockwise, as shown in FIG. Fig.12As shown, both sides of the toggle protrusion 22 are provided with toggle posts 23 .

[0052] The toggle protrusion 22 can be a quadrangular prism, a triangular prism, a semi-circular cylinder or other structures. To increase the contact area between the toggle post 23 and the toggle protrusion 22, the shape of the contact portion of the toggle post 23 with the toggle protrusion 22 is adapted to the surface of the toggle protrusion 22 that contacts the toggle post 23. For example, if the side of the toggle protrusion 22 that contacts the toggle post 23 is a vertical surface, the side of the toggle post 23 that contacts the toggle protrusion 22 is also a vertical surface; if the side of the toggle protrusion 22 that contacts the toggle post 23 is an inclined surface, the side of the toggle post 23 that contacts the toggle protrusion 22 is also an inclined surface. As a preferred embodiment of the present application, the toggle post 23 is a triangular prism structure, and the mechanical cam 16 is a cam made of nylon material.

[0053] Since the use environment of the knob switch is a high temperature environment, when the knob connecting rod 17 and the mechanical cam 16 are connected by means of clamping, threading, etc., the operator's operation time is long when replacing the mechanical cam 16, which is not conducive to working in a high temperature environment. Therefore, this application adopts a plug-in method to connect the knob connecting rod 17 and the mechanical cam 16. Fig.12 The knob connecting rod 17 is provided with an opening slot 24, and the mechanical cam 16 is provided with a snap-fitting protrusion 25 at a position corresponding to the opening slot 24. The connection between the knob connecting rod 17 and the mechanical cam 16 can be completed by inserting the snap-fitting protrusion 25 into the opening slot 24. At the same time, in order to ensure that the assembly of the knob connecting rod 17 and the mechanical cam 16 is more convenient and quick without reducing the use strength, the following parts are introduced: Figure 6 In the present application, a guide surface 26 is provided at the end surface of the clamping protrusion 25 facing the knob connecting rod 17, and two guide surfaces 26 form a triangular structure at the end of the clamping protrusion 25. As a preferred embodiment of the present application, four opening grooves 24 are provided on the end surface of the knob connecting rod 17, and the four opening grooves 24 are arranged at intervals along the circumference of the knob connecting rod 17. The side wall of the corresponding mechanical cam 16 is provided with four clamping protrusions 25 with triangular ends, and one clamping protrusion 25 corresponds to one opening groove 24.

[0054] See also Figure 4 A limiting protrusion 27 is also provided on the bottom plate 7, and the limiting protrusion 27 is at least located on the side of the limiting buckle 11 toward the rotation direction of the knob connecting rod 17. Under the blocking effect of the limiting protrusion 27, the metal plate 2 and the button base 8 will not rotate, thereby preventing the button base 8 from rotating with the operation direction and causing button contact operation signal errors.

[0055] Two limiting protrusions 27 can be set on the base plate 7, and a groove matched with the width of the limiting buckle 11 can be formed between the two limiting protrusions 27; or a limiting protrusion 27 can be set on the base plate 7, and two limiting buckles 11 can be set on the metal plate, with a limiting buckle 11 set on each side of the limiting protrusion 27, and the limiting buckle 11 fits with the side of the limiting protrusion 27, so that no matter whether the knob 18 is rotated clockwise or counterclockwise, the button base 8 will not rotate.

[0056] See also Fig.10 , Fig.11 , a magnet 28 is also provided on the end surface of the metal plate 2 close to the button base 8, and the button base 8 is made of metal. Under the adsorption effect of the magnet 28, the connection firmness between the metal plate 2 and the button base 8 is improved, so that when the connection card 1 is mounted with multiple button contact modules 14, the connection card 1 will not be loose, faulty or displaced, so as not to affect the quality of the on-site signal. Setting the button base 8 as a metal base can also solve the problem that the plastic button base 8 is easily aged, damaged and stuck in a high temperature, high pressure and dusty working environment, thereby reducing the failure rate. As a preferred embodiment of the present application, the magnet 28 is a convex EH series high-temperature resistant neodymium magnet. A fifth through hole 29 for mounting the magnet 28 is provided on the metal plate 2. A cavity 30 is provided inside the button base 8. The end of the magnet 28 away from the metal plate 2 extends into the cavity 30. As a preferred embodiment of the present application, a fifth through hole 29 is respectively provided at the four corners of the metal plate 2. A magnet 28 can be installed in each of the fifth through holes 29. When in use, the number of magnets 28 installed can be reasonably adjusted according to the number of mounting knob contacts and the vibration conditions of the working environment.

[0057] In addition, in the prior art, the button contact module 14 is connected to the button base 8 through a plastic card provided thereon. The plastic card is easily aged and damaged in a high temperature environment. When the knob 18 is operated, the plastic card is disengaged, which will cause a virtual connection of the signal and affect the normal operation of the device. Therefore, the prior art also has safety hazards in the production process caused by this. To solve this problem, the present application sets the button contact module 14 to be fixedly connected to the button base 8 through a threaded connector 31 (see Fig. 9 ), compared with the connection method between the button contact module 14 and the button base 8 in the prior art, the threaded connection is more secure, and there will be no unnecessary production safety accidents caused by the signal virtual connection caused by the plastic buckle breaking due to the high temperature and dusty working environment. As a preferred embodiment of the present application, the button contact module 14 is a structure made of plastic material.

[0058] Assembly order: see Fig.13, install the knob connecting rod 17 horizontally into the second through hole 19 on the operating housing 15, install the mechanical cam 16 horizontally at the tail end of the knob connecting rod 17, and install the knob 18 at the head of the knob connecting rod 17; align the snap-in protrusion 25 on the mechanical cam 16 with the four open slots 24 at the tail end of the knob connecting rod 17 and install it. Then install the bottom plate 7 horizontally on the tail end face of the operating housing 15 shell and fix it with screws. Next, install the three bottom plate buckles 3 on the back of the connecting card 1, first insert the two right-angle buckles (i.e., the limit buckles 11) into the first through hole 9, and then push the connecting card 1 to drive the 45° buckle (i.e., the fixed buckle 12) into the first through hole 9, and the installation of the connecting card 1 is completed. Install the small end face of the convex EH series high-temperature resistant neodymium magnet in the fifth through hole 29. Align the button base 8 with the base buckle 4 on the front of the connecting card 1, and push the buckle in to complete the installation of the button base 8. Finally, the button contact module 14 is mounted on the button base 8 through the threaded connector 31. According to the control requirements on site, multiple button contact modules 14 can be added to the button base 8 to meet the work needs.

[0059] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A connecting card for connecting a bottom plate and a button base, characterized in that: It includes a metal plate and a bottom plate buckle and a base buckle fixedly connected to the metal plate, wherein the bottom plate buckle and the base buckle each include a connecting plate and a clamping plate fixedly connected to the connecting plate, and the angle between the clamping plate and the connecting plate is not greater than 90°; The bottom plate buckle is located at one end of the metal plate facing the bottom plate, the bottom plate is provided with a first through hole, and the bottom plate buckle passes through the first through hole to be clamped with the bottom plate; The base buckle is located at one end of the metal plate facing the button base, and at least a pair of base buckles arranged opposite to each other are provided on the metal plate. A clamping platform with a thickness matching the clamping thickness of the base buckle is provided on the side of the button base facing away from the metal plate, and the base buckle is clamped with the clamping platform.

2. The connecting card for connecting the bottom plate and the button base according to claim 1, characterized in that: The bottom plate buckle includes a limiting buckle and a fixing buckle, the clamping plate of the limiting buckle is vertically arranged relative to its connecting plate, the clamping plate of the fixing buckle is inclined relative to its connecting plate, and the angle between the clamping plate of the fixing buckle and the connecting plate of the fixing buckle is an acute angle.

3. The connecting card for connecting the bottom plate and the button base according to claim 2, characterized in that: The angle between the clamping plate of the fixing buckle and the connecting plate of the fixing buckle is 45±5°.

4. The connecting card for connecting the bottom plate and the button base according to claim 2 or 3, characterized in that: At least one of the base buckles arranged in pairs is also provided with a hook structure fixedly connected to the clamping plate.

5. The connecting clamp for connecting the bottom plate and the button base according to claim 4, characterized in that: The opening of the hook-shaped structure faces a side away from the button base, and the included angle of the hook-shaped structure is an acute angle.

6. A knob switch, characterized in that: The device comprises a connecting card according to any one of claims 2 to 5, a bottom plate, a button base, a button contact module, an operating housing, a mechanical cam, a knob connecting rod and a knob, wherein a second through hole is provided on the operating housing, the knob connecting rod is placed in the second through hole, one end of the knob connecting rod is connected to the knob, and the other end of the knob connecting rod is connected to the mechanical cam; The operating housing has an opening at one end away from the knob, the bottom plate cover is arranged at the opening, the bottom plate is connected to the button base via the connecting card, and the button contact module is arranged at a side of the button base away from the bottom plate; A third through hole is provided on the metal plate, and a fourth through hole is provided on the button base. The diameters of the first through hole, the third through hole and the fourth through hole are all larger than the maximum distance between any two points on the outer contour of the knob connecting rod. A toggle protrusion is provided on the end face of the mechanical cam facing the button contact module, and the toggle protrusion is only provided on a part of the end face. A toggle post for use with the toggle protrusion is provided at one end of the button contact module facing the toggle protrusion, and the toggle post is located on the rotation path of the toggle protrusion, and the toggle post and the toggle protrusion are both located in the fourth through hole.

7. The rotary switch according to claim 6, characterized in that: The bottom plate is also provided with a limiting protrusion, which is located at least on one side of the limiting buckle, and along the rotation direction of the knob connecting rod, the limiting protrusion is located behind the limiting buckle.

8. The rotary switch according to claim 7, characterized in that: The bottom plate is provided with a limiting protrusion, the metal plate is provided with two limiting buckles, and the limiting buckles are respectively located on both sides of the limiting protrusion; The toggle posts are arranged on both sides of the toggle protrusion on the rotation path.

9. The rotary switch according to any one of claims 6 to 8, characterized in that: A magnet is also provided on the end surface of the metal plate close to the button base, and the portion of the button base in contact with the metal plate is a metal structure.

10. The rotary switch according to any one of claims 6 to 8, characterized in that: The button contact module is fixedly connected to the button base via a threaded connector.

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