Intelligent knob

Abstract

The utility model discloses an intelligent knob which comprises a base, a knob outer ring, an annular rotating piece, an inner supporting piece, a pinion, a spring glass bead, a PCBA circuit board, a display screen and a glass cover plate. The knob outer ring is rotatably mounted on the base, the base is provided with an annular cavity and a pinion mounting position, the annular rotating piece is rotatably mounted in the annular cavity, the annular rotating piece is connected with the knob outer ring, the annular rotating piece is provided with a large gear, the pinion is rotatably mounted on the pinion mounting position, and the pinion is meshed with the large gear. The pinion is provided with a permanent magnet; the spring glass bead is installed in the annular cavity, the annular rotating piece is provided with a circle of outer ripples, and the spring glass bead is in elastic contact fit with the outer ripples; the inner supporting piece is arranged on the upper side of the annular rotating piece, the PCBA circuit board is installed on the inner supporting piece, and a magnetic induction chip of the PCBA circuit board is matched with the permanent magnet in a magnetic induction mode. According to the utility model, the structure can be simplified, the assembly convenience is improved, the rotation smoothness is good, and the rotation hand feeling is good.

Description

Technical Field

[0001] This utility model relates to the field of potentiometer technology, and in particular to an intelligent knob. Background Technology

[0002] A rotary switch is a manual component that is controlled by hand. It can be rotated continuously or in a fixed position depending on the function required. Many household appliances on the market are equipped with rotary switches, such as gas stoves, water heaters, microwave ovens, and induction cookers. A smart rotary switch, on the other hand, is a rotary switch with a display and function switching capabilities. Replacing the ordinary rotary switch on a traditional stove with a smart rotary switch allows the switch status and function of the knob to be displayed on the screen, enabling users to intelligently control the operation of the appliance.

[0003] See Chinese Patent 202410117631.5, filed by the applicant on January 29, 2024, which discloses an intelligent knob, including a base shell, a rotating component, an inner support component, a pinion, a PCBA circuit board, a display module, and a knob outer ring; the upper side of the base shell has an annular cavity and a pinion mounting position; the rotating component includes a large gear and a knob support ring, the large gear being rotatably housed within the annular cavity; the inner support component is disposed on the upper side of the rotating component, and the rotating component can rotate on the lower side of the inner support component, the inner support component being connected to the base shell; the pinion is mounted on the pinion mounting position, the pinion meshes with the large gear, and the pinion is equipped with a permanent magnet; the PCBA circuit board is mounted on the inner support component, the PCBA circuit board is equipped with a magnetic induction chip, the magnetic induction chip and the permanent magnet are magnetically inductively coupled; the lower end of the knob outer ring is connected to the knob support ring of the rotating component. The rotating component has a large internal gear and a small gear mounted on the inner ring of the annular cavity. The large gear has an outer corrugation, and a spring is mounted on the outer ring of the annular cavity. The spring elastically contacts and engages with the outer corrugation of the large gear. A protrusion on one side of the spring elastically abuts against the outer corrugation. The display module includes a display support, a display screen, and a glass cover. Several support blocks are located on the upper outer periphery of the inner support. The display support is mounted on these support blocks. A display positioning cavity is located in the middle of the display support, and the display screen is installed within this cavity. An FPC cable connects the display screen to the PCBA circuit board. In this patent, rotating the outer ring of the knob rotates the rotating component, which in turn drives the small gear to rotate. The small gear then drives the permanent magnet to rotate. Finally, the magnetic induction chip senses the rotation of the permanent magnet and outputs an electrical signal. Simultaneously, the display screen displays various functions and data.

[0004] However, the smart knob also has the following technical problems: (1) The display module of the smart knob needs to be set with a display support. The display support is installed and positioned on the inner support block, which makes the display module more complicated and the installation more inconvenient; (2) Since the rotating part of the smart knob is mounted on the bottom shell and the outer ring of the knob is connected to the knob support ring of the rotating part, the weight of the outer ring of the knob presses on the rotating part, which makes the friction between the rotating part and the bottom shell larger and the rotation smoothness of the rotating part is adversely affected; (3) The smart knob uses a spring and an outer corrugated elastic contact. The spring has a small extension and contraction range and poor compression flexibility, so the hand feel when the outer ring of the knob is rotated is not good enough. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an intelligent knob that simplifies the structure, improves the ease of assembly, has good rotation smoothness, and provides a good rotation feel, in order to overcome the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: an intelligent knob, including a base, a knob outer ring, an annular rotating component, an inner support component, a small gear, a spring bead, a PCBA circuit board, a display screen, and a glass cover; the knob outer ring is rotatably mounted on the base, the upper side of the base is provided with an annular cavity and a small gear mounting position, the annular rotating component is rotatably mounted inside the annular cavity, the outer side of the annular rotating component is connected to the inner side of the knob outer ring, the inner side of the annular rotating component is provided with a large gear, the small gear is rotatably mounted on the small gear mounting position, the small gear meshes with the large gear, and the upper end of the small gear... A permanent magnet is installed inside; the spring glass bead is installed inside the annular cavity, and the lower outer side of the annular rotating component has an outer corrugation, with the spring glass bead elastically contacting and engaging with the outer corrugation; the inner support component is located on the upper side of the annular rotating component, and the annular rotating component can rotate on the lower side of the inner support component, which is connected to the base; the PCBA circuit board is installed on the inner support component, and the PCBA circuit board has a magnetic induction chip, which magnetically engages with the permanent magnet; the display screen is installed on the inner support component, the glass cover is installed on the display screen, and the outer ring of the knob is rotatably fitted around the display screen and the glass cover.

[0007] In the above technical solution, the inner ring of the annular cavity is provided with a glass bead mounting cavity, one end of which has a glass bead hole, and the other end has a baffle slot. The spring glass bead includes a glass bead, a first spring, and a spring baffle. The glass bead is installed inside one end of the glass bead mounting cavity, with its side end extending out of the glass bead hole and elastically contacting and engaging with the outer corrugations. The spring baffle is inserted into the baffle slot. The first spring is installed inside the glass bead mounting cavity, with one end of the first spring elastically abutting against one side of the glass bead, and the other end of the first spring elastically abutting against one side of the spring baffle. Furthermore, there are two spring glass beads, symmetrically arranged at both ends of the annular cavity.

[0008] In the above technical solution, the large gear of the annular rotating component is an internal gear, the small gear is mounted in the inner ring of the annular cavity, a shaft hole is provided above the small gear mounting position, a gear shaft is provided at the lower end of the small gear, and the gear shaft is rotatably mounted in the shaft hole; a cylindrical body is provided at the upper end of the small gear, the permanent magnet is installed in the cylindrical body, the inner support component is provided with a cylindrical body through hole, the cylindrical body is rotatably inserted into the cylindrical body through hole, and the position of the cylindrical body through hole corresponds to that of the magnetic induction chip.

[0009] In the above technical solution, the inner support member has a circuit board mounting cavity inside, and the PCBA circuit board is fixedly installed inside the circuit board mounting cavity; the upper side of the inner support member has a support ring, the glass cover is installed on the support ring, and the display screen and the PCBA circuit board are connected by an FPC cable.

[0010] In the above technical solution, a positioning ring is provided on the inner side of the lower end of the outer ring of the knob, and a connecting ring is provided on the outer side of the annular rotating part. The connecting ring is mounted on the positioning ring. The positioning ring has a first positioning part, and the connecting ring has a second positioning part. The first positioning part and the second positioning part are connected to each other. Further, the first positioning part is a positioning hole, and the second positioning part is a positioning post. The number of positioning holes and positioning posts is 3-5, and the positioning posts are inserted into the corresponding positioning holes. A retaining ring is provided on the inner side of the upper end of the outer ring of the knob. The upper side of the retaining ring is a guide slope. Several retaining blocks are connected to the outer periphery of the connecting ring. The retaining blocks pass over the guide slope from top to bottom and are engaged with the lower side of the retaining ring.

[0011] In the above technical solution, the intelligent knob further includes a fixing member and a second spring; the base has a central hole in its middle, the fixing member is movably inserted into the central hole in the base, and the height of the fixing member is greater than the height of the central hole in the base, so that the base can rise or fall outside the fixing member; the inner support member has a central hole in the support member, which corresponds vertically to the central hole in the base; the lower end of the PCBA circuit board has a function button, which passes through the central hole in the support member and presses against the fixing member; the second spring passes through the central hole in the support member and is disposed between the fixing member and the PCBA circuit board. The lower end of the fixing member has several connecting holes for fixing the fixing member to an external mechanism; the fixing member has a wire hole inside for passing through the ribbon cable connecting the PCBA circuit board; the upper middle part of the fixing member has a circular cavity, the bottom of which presses against the function button; the upper end of the second spring is sleeved outside the function button, and the lower end of the second spring is installed inside the circular cavity.

[0012] The beneficial effects of this utility model are as follows: This utility model uses a permanent magnet and a magnetic induction chip on the PCBA circuit board to achieve the output of electrical signals through magnetic induction. There is no contact or wear between the magnetic induction chip and the permanent magnet, and the service life is long. When the outer ring of the knob is rotated, the outer ring of the knob can drive the ring rotating component to rotate. The large gear of the ring rotating component then drives the small gear to rotate, and the small gear in turn drives the permanent magnet to rotate. Finally, the magnetic induction chip senses the rotation of the permanent magnet and outputs an electrical signal. The component structure for driving the rotation of the permanent magnet in this utility model is relatively simple, easy to assemble, and low in cost. Moreover, only one permanent magnet and one magnetic induction chip are needed to achieve the rotation electrical signal output of the smart knob, and the number of encoded signals is unlimited, making it easier to control the various functions of the smart knob. This invention eliminates the need for a separate display screen support in existing technologies, as the display screen is mounted on an inner support and the glass cover is mounted on top of the display screen. This simplifies the overall structure of the smart knob and improves its assembly convenience. Furthermore, the outer ring of the knob is rotatably mounted on the base, with the outer side of the annular rotating component connected to the inner side of the outer ring. This prevents the weight of the outer ring from pressing down on the annular rotating component, reducing friction between the annular rotating component and the base, resulting in smoother rotation. Finally, this invention utilizes a spring-loaded glass ball in elastic contact with the outer corrugations of the annular rotating component. Compared to traditional spring-loaded structures, the spring-loaded glass ball in this invention exhibits a larger range of expansion and contraction deformation and better compression flexibility, providing a better tactile feel when manually rotating the outer ring of the knob. Attached Figure Description

[0013] Figure 1 This is a first-person view of the overall structure of the smart knob.

[0014] Figure 2This is a schematic diagram of the overall structure of the smart knob from a second-view perspective.

[0015] Figure 3 This is a schematic diagram of the longitudinal section structure of the smart knob.

[0016] Figure 4 This is a first-person perspective schematic diagram of the distributed structure of the smart knob.

[0017] Figure 5 This is a schematic diagram of the second-view dispersion structure of the smart knob. Detailed Implementation

[0018] The structural and working principles of this utility model will be further described in detail below with reference to the accompanying drawings.

[0019] like Figures 1-5 As shown, this utility model is an intelligent knob, including a base 1, a knob outer ring 2, an annular rotating component 3, an inner support component 4, a small gear 5, a spring bead 6, a PCBA circuit board 7, a display screen 8, and a glass cover 9. The knob outer ring 2 is rotatably mounted on the base 1. The upper side of the base 1 is provided with an annular cavity 11 and a small gear mounting position 12. The annular rotating component 3 is rotatably mounted inside the annular cavity 11. The outer side of the annular rotating component 3 is connected to the inner side of the knob outer ring 2. The inner side of the annular rotating component 3 is provided with a large gear 31. The small gear 5 is rotatably mounted on the small gear mounting position 12 and meshes with the large gear 31. A permanent magnet is installed inside the upper end of the small gear 5. 10; The spring glass bead 6 is installed inside the annular cavity 11, and the outer side of the lower end of the annular rotating member 3 is provided with an outer corrugation 32. The spring glass bead 6 is in elastic contact with the outer corrugation 32; The inner support member 4 is provided on the upper side of the annular rotating member 3, and the annular rotating member 3 can rotate on the lower side of the inner support member 4. The inner support member 4 is connected to the base 1; The PCBA circuit board 7 is installed on the inner support member 4. The PCBA circuit board 7 is provided with a magnetic induction chip 71. The magnetic induction chip 71 is in magnetic induction contact with the permanent magnet 10; The display screen 8 is installed on the inner support member 4, and the glass cover plate 9 is installed on the display screen 8. The outer ring 2 of the knob is rotatably fitted outside the display screen 8 and the glass cover plate 9.

[0020] This invention employs a permanent magnet 10 and a magnetic induction chip 71 on a PCBA circuit board 7 to achieve electrical signal output through magnetic induction. The magnetic induction chip 71 and the permanent magnet 10 are contactless, wear-free, and have a long service life. When the outer ring 2 of the knob is rotated, it drives the annular rotating component 3 to rotate. The large gear 31 of the annular rotating component 3 then drives the small gear 5 to rotate, which in turn drives the permanent magnet 10 to rotate. Finally, the magnetic induction chip 71 senses the rotation of the permanent magnet 10 and outputs an electrical signal. The component structure for driving the permanent magnet 10 is simple, easy to assemble, and low in cost. Furthermore, only one permanent magnet 10 and one magnetic induction chip 71 are needed to achieve the rotational electrical signal output of the intelligent knob, and the number of encoded signals is unlimited, making the control of various functions of the intelligent knob easier. This invention eliminates the need for a display screen support in the prior art by mounting the display screen 8 on the inner support member 4 and the glass cover plate 9 on the display screen 8. This simplifies the overall structure of the smart knob and improves its assembly convenience. Furthermore, the outer ring 2 of the knob is rotatably mounted on the base 1, and the outer side of the annular rotating member 3 is connected to the inner side of the outer ring 2. This prevents the weight of the outer ring 2 from pressing down on the annular rotating member 3, reducing friction between the annular rotating member 3 and the base 1, resulting in smooth rotation of the annular rotating member 3. Finally, this invention utilizes a spring-loaded glass ball 6 in elastic contact with the outer corrugations 32 of the annular rotating member 3. Compared to traditional spring structures, the spring-loaded glass ball 6 of this invention has a larger range of expansion and contraction deformation and better compression flexibility, providing a better feel when manually rotating the outer ring 2 of the knob.

[0021] like Figure 4 and Figure 5As shown, the annular cavity 11 has a glass bead mounting cavity 13 at its inner ring position. One end of the glass bead mounting cavity 13 has a glass bead hole 131, and the other end has a baffle slot 132. The spring glass bead 6 includes a glass bead 61, a first spring 62, and a spring baffle 63. The glass bead 61 is installed inside one end of the glass bead mounting cavity 13, and the side end of the glass bead 61 extends out of the glass bead hole 131 and elastically contacts and engages with the outer corrugation 32. The spring baffle 63 is inserted into the baffle slot 132. The first spring 62 is installed inside the glass bead mounting cavity 13, with one end of the first spring 62 elastically abutting against one side of the glass bead 61, and the other end of the first spring 62 elastically abutting against one side of the spring baffle 63. Preferably, there are two spring glass beads 6, which are symmetrically arranged at both ends of the annular cavity 11. When a person rotates the knob, they need to apply a little force to rotate the outer ring of the knob so that the glass ball 61 of the spring glass ball 6 can slide over each crest of the outer corrugation and feel the process of the glass ball 61 sliding over each crest and trough of the outer corrugation. When the person stops rotating the knob, under the action of the first spring 62, the glass ball 61 will stay in the trough of the outer corrugation, so that the annular rotating part and the outer ring of the knob stop moving.

[0022] like Figures 3-5 As shown, the large gear 31 of the annular rotating member 3 is an internal gear, and the small gear mounting position 12 is located in the inner ring of the annular cavity 11. A shaft hole 121 is provided above the small gear mounting position 12, and a gear shaft 51 is provided at the lower end of the small gear 5. The gear shaft 51 is rotatably installed within the shaft hole 121. A cylindrical body 52 is provided at the upper end of the small gear 5, and the permanent magnet 10 is installed within the cylindrical body 52. ​​The inner support member 4 has a cylindrical body through hole 41, and the cylindrical body 52 is rotatably inserted into the cylindrical body through hole 41. The position of the cylindrical body through hole 41 corresponds to that of the magnetic induction chip 71, and the change in the magnetic field when the permanent magnet rotates can be sensed in real time by the magnetic induction chip 71. The magnetic induction chip 71 is preferably a Hall effect chip.

[0023] like Figures 3-5 As shown, the inner support member 4 has a circuit board mounting cavity 42 inside, and the PCBA circuit board 7 is fixedly installed inside the circuit board mounting cavity 42; the upper side of the inner support member 4 has a support ring 43, the glass cover plate 9 is installed on the support ring 43, and the display screen 8 is connected to the PCBA circuit board 7 by an FPC cable.

[0024] like Figures 3-5As shown, a positioning ring 21 is provided on the inner side of the lower end of the outer ring 2 of the knob, and a connecting ring 33 is provided on the outer side of the annular rotating part 3. The connecting ring 33 is mounted on the positioning ring 21. The positioning ring 21 has a first positioning part 211, and the connecting ring 33 has a second positioning part 331. The first positioning part 211 and the second positioning part 331 are connected to each other. The first positioning part 211 is a positioning hole, and the second positioning part 331 is a positioning post. There are 3-5 positioning holes and positioning posts, and the positioning posts are inserted into the corresponding positioning holes. A retaining ring 22 is provided on the inner side of the upper end of the outer ring 2 of the knob. The upper side of the retaining ring 22 is a guide slope. Several retaining blocks 332 are connected to the outer periphery of the connecting ring 33. The retaining blocks 332 pass over the guide slope from top to bottom and are engaged with the lower side of the retaining ring 22.

[0025] like Figures 3-5 As shown, the smart knob also includes a fixing member 14 and a second spring 15; the base 1 has a base hole 16 in the middle, the fixing member 14 is movably inserted into the base hole 16, and the height of the fixing member 14 is greater than the height of the base hole 16, so that the base 1 can rise or fall outside the fixing member 14; the inner support member 4 has a support hole 43, the support hole 43 corresponds vertically to the base hole 16, the lower end of the PCBA circuit board 7 has a function button 72, the function button 72 passes through the support hole 43 and is pressed and engaged with the fixing member 14, and the second spring 15 passes through the support hole 43 and is disposed between the fixing member 14 and the PCBA circuit board 7. The lower end of the fixing component is fixed to the mechanism of appliances such as gas stoves, water heaters, microwave ovens, and induction cookers. When a person presses the glass cover of the smart knob, all components except the fixing component will descend as a whole, and the upper end of the fixing component will press the function button. When the person releases the pressure on the glass cover of the smart knob, all components except the fixing component will rise as a whole under the elastic action of the second spring, and the upper end of the fixing component will release the pressure on the function button. The smart knob has multiple functions, such as power, speed, time, etc., which can be switched or confirmed by pressing the function button, and the values ​​or operations can be adjusted by rotating the ring-shaped rotating component.

[0026] like Figures 4-5 As shown, the lower end of the fixing member 14 is provided with several connecting holes 141, which are used to fix the fixing member 14 to an external mechanism; the fixing member 14 is provided with a wire through hole 142, which is used to pass through the ribbon cable connecting the PCBA circuit board 7; the upper end of the fixing member 14 is provided with a circular cavity 143, the bottom of the circular cavity 143 is pressed and engaged with the function button 72, the upper end of the second spring 15 is sleeved outside the function button 72, and the lower end of the second spring 15 is installed inside the circular cavity 143.

[0027] The above description is merely a preferred embodiment of this utility model. Any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical solution of this utility model shall fall within the scope of the technical solution of this utility model.

Claims

1. A smart knob, characterized by: The application relates to a rotary knob, which comprises a base, a rotary knob outer ring, an annular rotary part, an inner support part, a pinion, spring beads, a PCBA circuit board, a display screen and a glass cover plate; the rotary knob outer ring is rotatably arranged on the base; the upper side of the base is provided with an annular cavity and a pinion mounting position; the annular rotary part is rotatably arranged in the annular cavity; the outer side of the annular rotary part is connected with the inner side of the rotary knob outer ring; the inner side of the annular rotary part is provided with a large gear; the pinion is rotatably arranged on the pinion mounting position; the pinion is engaged with the large gear; a permanent magnet is arranged in the upper end of the pinion; the spring beads are arranged in the annular cavity; the lower end outer side of the annular rotary part is provided with an outer wave; the spring beads are elastically contacted with the outer wave; the inner support part is arranged on the upper side of the annular rotary part and can rotate on the lower side of the inner support part; the inner support part is connected with the base; the PCBA circuit board is arranged on the inner support part; the PCBA circuit board is provided with a magnetic induction chip; the magnetic induction chip is magnetically inducted with the permanent magnet; the display screen is arranged on the inner support part; the glass cover plate is arranged on the display screen; the rotary knob outer ring is rotatably sleeved outside the display screen and the glass cover plate.

2. The smart knob of claim 1, wherein: The inner ring position of the annular cavity is provided with a bead mounting cavity; one end of the bead mounting cavity is provided with a bead hole; the other end of the bead mounting cavity is provided with a baffle slot; the spring bead comprises a bead, a first spring and a spring baffle; the bead is arranged in one end of the bead mounting cavity; the side end of the bead extends out of the bead hole and is elastically contacted with the outer wave; the spring baffle is inserted into the baffle slot; the first spring is arranged in the bead mounting cavity; one end of the first spring is elastically abutted against one side of the bead; the other end of the first spring is elastically abutted against one side of the spring baffle.

3. The smart knob of claim 2, wherein: The number of the spring beads is two; the two spring beads are symmetrically arranged at the two ends of the annular cavity.

4. The smart knob of claim 1, wherein: The large gear of the annular rotary part is an internal gear; the pinion mounting position is arranged at the inner ring position of the annular cavity; the pinion mounting position is provided with a shaft hole; the lower end of the pinion is provided with a gear shaft; the gear shaft is rotatably arranged in the shaft hole; the upper end of the pinion is provided with a cylinder; the permanent magnet is arranged in the cylinder; the inner support part is provided with a cylinder through hole; the cylinder is rotatably inserted into the cylinder through hole; the cylinder through hole corresponds to the position of the magnetic induction chip.

5. The smart knob of claim 1, wherein: The inner support part is provided with a circuit board mounting cavity; the PCBA circuit board is fixedly arranged in the circuit board mounting cavity; the upper side of the inner support part is provided with a support ring; the glass cover plate is arranged on the support ring; the display screen and the PCBA circuit board are connected with an FPC flat cable.

6. The smart knob of claim 1, wherein: The lower end inner side of the rotary knob outer ring is provided with a positioning ring; the outer side of the annular rotary part is provided with a connecting ring; the connecting ring is arranged on the positioning ring; the positioning ring is provided with a first positioning part; the connecting ring is provided with a second positioning part; the first positioning part and the second positioning part are connected with each other.

7. The smart knob of claim 6, wherein: The first positioning part is a positioning hole, and the second positioning part is a positioning column, the number of the positioning hole and the positioning column is 3-5, and the positioning column is inserted into the corresponding positioning hole.

8. The smart knob of claim 6, wherein: The upper end of the knob outer ring is provided with a snap ring, the upper side of the snap ring is a guide slope, the outer periphery of the connecting ring is connected with a plurality of clamping blocks, the clamping blocks pass over the guide slope from top to bottom and are clamped into the lower side of the snap ring.

9. The smart knob of claim 1, wherein: The smart knob further comprises a fixing member and a second spring; the middle part of the base is provided with a base middle hole, the fixing member is movably inserted into the base middle hole, and the height of the fixing member is greater than the height of the base middle hole, so that the base can be lifted or lowered outside the fixing member; the inner support member is provided with a support member middle hole, the support member middle hole corresponds to the base middle hole in up and down directions, the lower end of the PCBA circuit board is provided with a function button, the function button passes through the support member middle hole and is pressed and matched with the fixing member, and the second spring passes through the support member middle hole and is arranged between the fixing member and the PCBA circuit board.

10. The smart knob of claim 9, wherein: The lower end of the fixing member is provided with a plurality of connecting holes, the connecting holes are used for fixedly connecting the fixing member to an external mechanism; the fixing member is provided with a wire passing hole, the wire passing hole is used for passing a wire connecting the PCBA circuit board; the upper end of the fixing member is provided with a circular recess in the middle part, the bottom of the circular recess is pressed and matched with the function button, the upper end side of the second spring is sleeved outside the function button, and the lower end of the second spring is installed in the circular recess. The lower end of the fixing member is provided with a plurality of connecting holes, the connecting holes are used for fixedly connecting the fixing member to an external mechanism; the fixing member is provided with a wire passing hole, the wire passing hole is used for passing a wire connecting the PCBA circuit board; the upper end of the fixing member is provided with a circular recess in the middle part, the bottom of the circular recess is pressed and matched with the function button, the upper end side of the second spring is sleeved outside the function button, and the lower end of the second spring is installed in the circular recess.

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