A knob switch structure

Abstract

This utility model relates to a rotary switch structure, including a housing and a knob. The knob rotates circumferentially and slides axially relative to the housing. The housing contains a circuit board, a display assembly, a track, and a grating frame. The display assembly is connected to the circuit board and slides synchronously with the knob. The grating frame rotates and slides synchronously with the knob. The circuit board has a first micro switch and a photoelectric sensor. The lower end of the grating frame has several equally spaced grating teeth distributed circumferentially. Each grating tooth approaches or moves away from the photoelectric sensor as the knob rotates. The circuit board also has a second micro switch. The housing also contains a bracket, a rocker arm, and a stop pin. The rocker arm is hinged to the bracket at its middle, with one end engaging with the display assembly. Using the above technical solution, this utility model provides a rotary switch structure with a compact internal structure, allowing for both rotation and pull-up / push-down operation within a limited space.

Description

Technical Field

[0001] This utility model relates to the field of automotive switch technology, and in particular to a rotary switch structure. Background Technology

[0002] With the rapid development of automotive electronics technology, more and more electrified functions are being integrated into automobiles, leading to higher requirements for operating control methods and appearance. At the same time, in order to meet people's current pursuit of a technological feel, ease of operation, and aesthetic appeal in automobiles, car manufacturers are also launching more and more new operating methods and exterior designs.

[0003] Conventional rotary switches on the market can only perform a single rotation operation. Some car models have rotary switches with built-in displays. Microswitches are set on the circuit board inside the switch. The display function can be operated by pressing down on the microswitches. However, these rotary switches only support pressing down and do not have an upward pull function. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the prior art by providing a rotary switch structure. This switch has a compact internal structure, requires little space, and can be rotated and pulled up and pressed down in a limited space to achieve dual operation.

[0005] The technical solution of this utility model is as follows: A rotary switch structure includes a housing and a knob. The knob rotates circumferentially and slides axially relative to the housing. The housing contains a circuit board, a display assembly, a track, and a grating frame. The display assembly is connected to the circuit board and slides synchronously with the knob. The grating frame rotates and slides synchronously with the knob. The circuit board has a first micro switch and a photoelectric sensor. The lower end of the grating frame has several equally spaced grating teeth distributed circumferentially. Each grating tooth approaches or moves away from the photoelectric sensor as the knob rotates. The circuit board also has a second micro switch. The housing also contains a bracket, a rocker arm, and a stop pin. The rocker arm is located above the two micro switches and corresponds to the micro switch positions. The device includes a pressing part, with the middle part of the swing arm hinged to the bracket. One end of the swing arm engages with the display screen assembly to trigger a first micro switch or a second micro switch when the knob slides axially. The stop pin is located above the swing arm and slides laterally on the bracket. The track body is located inside the grating frame and slides synchronously with the grating frame relative to the bracket. An extension block is provided inside the track body, with a groove for the end of the stop pin to slide into and inclined surfaces at the upper and lower ends of the groove. Several equally spaced stop grooves are provided on the outer surface of the track body. A spring piece is provided on the grating frame at the corresponding position of the stop groove to achieve positioning. A return spring is provided on the bracket to drive the stop pin to slide towards the track body.

[0006] By adopting the above technical solution, the knob can be rotated and operated by pulling up and pressing down simultaneously without increasing the space occupied by the knob. A stop pin is set on the inner side of the track body, and the track body is set on the outer side. Both rotation and pull-up / press-down operations share the same track body, which enhances the operating feel and effectively saves space and cost. During the pull-up / press-down operation, the track body cooperates with the stop pin, and the knob, display assembly, grating frame and track body slide synchronously, driving the rocker arm to swing and triggering the first micro switch or the second micro switch. When the knob is rotated, the track body cooperates with the spring, and the knob, grating frame and spring rotate synchronously. The spring slides on the track body, positioning itself with the stop groove and producing a clicking sound.

[0007] Further features of this invention: The bracket is provided with a columnar part and a receiving groove arranged outwards and inwards. The columnar part is located inside the track body and has a receiving cavity inside. The receiving cavity has a hinge shaft. The swing rod is located inside the receiving cavity and is hinged to the hinge shaft in the middle. The bottom wall of the receiving groove is lower than the columnar part. The lower end of the grating frame is located inside the receiving groove and can slide axially and rotate circumferentially relative to the receiving groove. The bottom of the receiving groove has a notch corresponding to the position of the photoelectric sensor so that the grating teeth can cooperate with the photoelectric sensor.

[0008] With the above-mentioned further design, the structural layout is reasonable, the installation positions of each component are reasonably distributed, and the operation is not affected. This makes the overall structure of the rotary switch compact and effectively reduces the space occupied during installation.

[0009] A further feature of this invention is as follows: The outer casing also includes an inner display screen housing. The upper end of the inner display screen housing is connected to the display screen assembly. The lower end of the inner display screen housing is provided with a connecting portion and a guide plate located inside the connecting portion. The connecting portion is located inside the track body and connected to the track body. A slot is provided on the connecting portion corresponding to the extension block position to allow the end of the stop pin to extend. The columnar portion is located between the guide plate and the connecting portion. A sliding groove is provided on the guide plate along its vertical direction. A protrusion is provided on the inner wall of the columnar portion, and the protrusion is located within the sliding groove. A connecting plate is provided inside the bracket. The lower end of the connecting plate is connected to one end of the swing arm, and the upper end of the connecting plate abuts against the inner display screen housing. This allows the swing arm to swing and trigger a first micro switch or a second micro switch when the display screen slides circumferentially.

[0010] With the above-mentioned further configuration, the inner shell of the display screen slides synchronously with the knob. During the operation of pulling up and pressing down the knob, the inner shell of the display screen slides synchronously with the track body and relative to the bracket. The guide plate and the bracket can play a guiding role through the cooperation of the protrusion and the slide groove, so that the structure is stable and does not deviate when the inner shell of the display screen slides. The connecting plate is connected to one end of the swing rod. During the operation of pulling up and pressing down the knob, the swing rod swings relative to the bracket to trigger the first micro switch or the second micro switch. The operation structure is simple and has good stability.

[0011] A further feature of this invention is that the columnar portion has a first mounting cavity along its transverse direction, and two stop pins are provided, with the ends of the two stop pins extending from both sides of the first mounting cavity respectively, and the two ends of the reset spring abutting against the two stop pins respectively.

[0012] The above-mentioned further design improves the stability of the axial sliding of the track body and the operating feel. The two stop pins are provided with mounting posts at their opposite ends, and the return springs are sleeved on the two mounting posts. When the track body slides axially, when the inclined surface of the extension block contacts the stop pins, it will press the two stop pins into the first mounting cavity. The two stop pins press the return springs. When the groove of the extension block corresponds to the stop pin, the return spring resets the stop pin, and the end of the stop pin slides into the groove.

[0013] A further feature of this invention is that the grating frame is provided with a second mounting cavity with an open upper end, the spring piece is disposed in the second mounting cavity, and the side of the second mounting cavity facing the track body is provided with an opening for the spring piece to extend out and engage with the positioning groove.

[0014] With the above-mentioned further configuration, the spring is installed on the grating frame. As the grating frame slides axially and rotates circumferentially, the spring part is always located in the stop groove of the track body during axial sliding, which avoids the spring from separating from the track body and affecting subsequent positioning. During circumferential rotation, the track body remains stationary, and the spring passes through each stop groove in sequence, which enhances the operating feel. The upper end of the second mounting cavity is open to facilitate the installation of the spring.

[0015] A further feature of this invention is that a bearing is provided inside the outer shell, with the lower end of the bearing pressed against the grating frame and the track body, and the upper end of the bearing in contact with the display screen assembly. Several elastic hooks are provided along the circumference of the grating frame, and each elastic hook is hooked onto the upper end face of the bearing.

[0016] By adopting the above-mentioned further design, through the cooperation of the inner and outer rings of the bearing, the coaxiality of the product is effectively guaranteed when the knob and grating frame rotate relative to the bracket, reducing the amount of shaking, and the product has a solid feel and low noise.

[0017] A further improvement of this invention is that the circuit board is covered with waterproof rubber, the bracket is located above the waterproof rubber, and the waterproof rubber has protrusions at the positions of the two microswitches.

[0018] The above-mentioned further design protects the circuit board, preventing liquids and other substances from entering the casing and affecting its use.

[0019] A further feature of this invention is that the spring includes two supporting legs and a connecting section connecting the two supporting legs. The two supporting legs are located inside the mounting cavity and abut against the side wall of the mounting cavity. The connecting section is arc-shaped and extends out from the opening.

[0020] With the above-mentioned further design, the two support feet of the spring are supported in the mounting cavity to prevent the spring from shaking, making it more stable during use. The through groove facilitates the spring to extend from the mounting cavity and cooperate with the track body. The connecting section is set in an arc shape to facilitate entry and exit from the stop groove, avoid jamming, and enhance the operating feel.

[0021] A further feature of this invention is that the columnar part is provided with guide grooves located at the upper and lower ends of the first mounting cavity, both guide grooves are connected to the first mounting cavity, and both stop pins are provided with two guide sliders, which are slidably disposed in the corresponding guide grooves.

[0022] By adopting the above-mentioned further settings, the movement of the stop pin is smooth and stable when it slides in the first mounting cavity, and it will not tilt up due to the sliding of the track body.

[0023] A further feature of this invention is that the display assembly is connected to the circuit board via a flexible connecting piece, the inner shell of the display is provided with a first through groove communicating with the accommodating cavity, the waterproof rubber is provided with a second through groove communicating with the accommodating cavity, and the flexible connecting piece passes through the first through groove, the accommodating cavity and the second through groove in sequence to connect with the circuit board.

[0024] With the above-mentioned further settings, the connection between the display assembly and the circuit board will not be affected when the display assembly slides. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the present utility model;

[0026] Figure 2 This is a cross-sectional view of a specific embodiment of the present utility model;

[0027] Figure 3 This is a cross-sectional view from another direction of a specific embodiment of the present utility model;

[0028] Figure 4 for Figure 3Enlarged view of section A;

[0029] Figure 5 This is a schematic diagram of the track body and spring sheet in a specific embodiment of this utility model;

[0030] Figure 6 This is a schematic diagram of the bearing and bracket according to a specific embodiment of the present utility model;

[0031] Figure 7 This is a schematic diagram of a specific embodiment of the bracket of this utility model;

[0032] Figure 8 This is a cross-sectional view of the bracket according to a specific embodiment of the present utility model;

[0033] Figure 9 This is a cross-sectional view of the bracket according to a specific embodiment of the present utility model from another direction;

[0034] Figure 10 This is a schematic diagram of the grating frame according to a specific embodiment of the present invention;

[0035] Figure 11 This is a cross-sectional view of the inner shell of the display screen in a specific embodiment of this utility model;

[0036] Figure 12 This is a schematic diagram of the inner shell of the display screen according to a specific embodiment of the present utility model;

[0037] Figure 13 This is a schematic diagram of the grating frame and photoelectric sensor according to a specific embodiment of the present invention;

[0038] Figure 14 This is a schematic diagram of a specific embodiment of the waterproof rubber of this utility model.

[0039] In the diagram, 1. Outer shell; 11. Inner shell of the display screen; 111. Connecting part; 112. Guide plate; 113. Groove; 114. Slide groove; 115. First through groove; 12. Bearing; 2. Knob; 21. Inner shell of the knob; 3. Circuit board; 31. First micro switch; 32. Photoelectric sensor; 33. Second micro switch; 34. Waterproof rubber; 341. Protrusion; 342. Second through groove; 4. Display screen assembly; 5. Track body; 51. Extension block; 511. Groove; 512. Inclined surface; 52. Stop. 6. Groove; 61. Grating tooth; 62. Spring; 621. Support foot; 622. Connecting section; 63. Second mounting cavity; 631. Opening; 64. Elastic hook; 7. Bracket; 71. Return spring; 72. Columnar part; 721. Receiving cavity; 722. Protrusion; 723. Guide groove; 73. Receiving groove; 731. Notch; 74. Connecting plate; 75. First mounting cavity; 8. Swing rod; 81. Pressing part; 9. Stop pin; 91. Mounting post; 92. Guide slider; 10. Flexible connecting piece. Detailed Implementation

[0040] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] It should be noted that all directional indicators (such as up, down, forward, backward, etc.) in the description of this utility model are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0042] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0044] like Figure 1-14As shown, a rotary switch structure includes a housing 1 and a knob 2. The knob 2 is a crystal knob, which is more aesthetically pleasing and allows for a direct view of the contents of the display assembly 4. Below the knob 2 is a knob inner shell 21 that rotates circumferentially and slides axially with it. The knob 2 rotates circumferentially and slides axially relative to the housing 1. The housing 1 contains a circuit board 3, a display assembly 4, a track 5, and a grating frame 6. The display assembly 4 is connected to the circuit board 3 and slides synchronously with the knob 2. The grating frame 6 rotates and slides synchronously with the knob 2. The circuit board 3 is equipped with a first micro switch 31 and a photoelectric sensor 32. The lower end of the grating frame 6 has several gratings evenly distributed along its circumference. Each grating tooth 61 approaches or moves away from the photoelectric sensor 32 as the knob 2 rotates. When the grating tooth 61 moves away from the photoelectric sensor 32, it connects the light signal to the photoelectric sensor 32, which is an optocoupler. The circuit board 3 is also equipped with a second micro switch 33. The housing 1 is also equipped with a bracket 7, a swing arm 8, and a stop pin 9. The swing arm 8 is located above the two micro switches, and a pressing part 81 is provided corresponding to the micro switch position. The lower end face of the pressing part 81 is arc-shaped, which makes triggering the micro switch smoother. The middle part of the swing arm 8 is hinged to the bracket 7, and one end is engaged with the display assembly 4 so that when the knob 2 slides axially, it triggers the first micro switch 31 or the second micro switch 33. The stop pin 9 is located above the lever 8 and slides laterally on the bracket 7. The track body 5 is located inside the grating frame 6, and the track body 5 and the grating frame 6 slide synchronously relative to the bracket 7. An extension block 51 is provided inside the track body 5. The extension block 51 has a groove 511 for the end of the stop pin 9 to slide into and inclined surfaces 512 located at the upper and lower ends of the groove 511. Several equally spaced stop grooves 52 are provided on the outer surface of the track body 5. The grating frame 6 has a spring piece 62 corresponding to the stop groove 52 for positioning. The bracket 7 has a return spring 71 for driving the stop pin 9 to slide towards the track body 5, which can realize the rotation operation of the knob 2 and the pull-up operation. The dual-operation pressing mechanism does not increase the space occupied by the knob 2. A stop pin 9 is set on the inner side of the track body 5, and the track body 5 is set on the outer side. Whether it is rotation operation or pull-up and press-down operation, the same track body 5 is used to enhance the operation feel and effectively save space and cost. When pulling up and pressing down, the track body 5 cooperates with the stop pin 9, and the knob 2, display assembly 4, grating frame 6 and track body 5 slide synchronously, driving the swing arm 8 to swing and triggering the first micro switch 31 or the second micro switch 33. When the knob 2 is rotated, the track body 5 cooperates with the spring 62, and the knob 2, grating frame 6 and spring 62 rotate synchronously. The spring 62 slides on the track body 5, and is positioned with the stop groove 52 and a clicking sound is produced.

[0045] The bracket 7 is provided with a columnar part 72 and a receiving groove 73 arranged outwards and inwards. The columnar part 72 is located inside the track body 5 and has a receiving cavity 721. The receiving cavity 721 is provided with a hinge shaft. The swing rod 8 is located in the receiving cavity 721 and is hinged to the hinge shaft in the middle. The bottom wall of the receiving groove 73 is set lower than the columnar part 72. The lower end of the grating frame 6 is located in the receiving groove 73 and can slide axially and rotate circumferentially relative to the receiving groove 73. The bottom of the receiving groove 73 has a notch 731 corresponding to the position of the photoelectric sensor 32 so that the grating teeth 61 can cooperate with the photoelectric sensor 32. The structure layout is reasonable, and the installation positions of each component are reasonably distributed without affecting the operation. This makes the overall structure of the knob 2 switch compact and effectively reduces the space occupied during installation.

[0046] The outer casing 1 also includes a display screen inner casing 11. The upper end of the display screen inner casing 11 is connected to the display screen assembly 4. The lower end of the display screen inner casing 11 has a connecting part 111 and a guide plate 112 located inside the connecting part 111. The connecting part 111 is located inside the track body 5 and is connected to the track body 5. The connecting part 111 has a slot 113 corresponding to the position of the extension block 51 to allow the end of the stop pin 9 to extend. The columnar part 72 is located between the guide plate 112 and the connecting part 111. The guide plate 112 has a sliding groove 114 along its vertical direction. The inner wall of the columnar part 72 has a protrusion 722 located in the sliding groove 114. The bracket 7 has a connecting plate 74 inside. The lower end of the connecting plate 74 is connected to one end of the swing rod 8. The connecting plate 74 has a connection port. The swing arm 8 is equipped with a connecting block located inside the connection port. The upper end of the connecting plate 74 abuts against the inner shell 11 of the display screen. When the display screen slides circumferentially, the swing arm 8 is driven to swing and trigger the first micro switch 31 or the second micro switch 33. The inner shell 11 of the display screen slides synchronously with the knob 2. During the operation of the knob 2 pulling up and pressing down, the inner shell 11 of the display screen slides synchronously with the track body 5 and relative to the bracket 7. The guide plate 112 and the bracket 7 are connected by the cooperation of the protrusion 722 and the slide groove 114, which can play a guiding role, so that the structure is stable and does not deviate when the inner shell 11 of the display screen slides. The connecting plate 74 is connected to one end of the swing arm 8. During the operation of the knob 2 pulling up and pressing down, the swing arm 8 swings relative to the bracket 7 to trigger the first micro switch 31 or the second micro switch 33. The operation structure is simple and has good stability.

[0047] The columnar portion 72 has a first mounting cavity 75 along its transverse direction. Two stop pins 9 are provided, with their ends extending from both sides of the first mounting cavity 75. The return spring 71 has its two ends respectively abutting against the two stop pins 9, improving the smoothness of the axial sliding of the track body 5 and the operating feel. One end of each stop pin 9 has a mounting post 91 facing each other, and the return spring 71 is sleeved on the two mounting posts 91. When the track body 5 slides axially, when the inclined surface 512 of the extension block 51 contacts the stop pins 9, it presses the two stop pins 9 into the first mounting cavity 75, and the two stop pins 9 press against the return spring. 71. When the groove 511 of the extension block 51 corresponds to the stop pin 9, the return spring 71 resets the stop pin 9, and the end of the stop pin 9 slides into the groove 511. The columnar part 72 is provided with guide grooves 723 located at the upper and lower ends of the first mounting cavity 75. Both guide grooves 723 are connected to the first mounting cavity 75. Both stop pins 9 are provided with two guide sliders 92. The two guide sliders 92 are slidably disposed in the corresponding guide grooves 723, so that when the stop pin 9 slides in the first mounting cavity 75, the movement is smooth and does not deviate. It always remains stable and will not cause the stop pin 9 to lift up due to the sliding of the track body 5.

[0048] The grating frame 6 has a second mounting cavity 63 with an open upper end. The spring piece 62 is disposed in the second mounting cavity 63. The upper end of the second mounting cavity 63 is also provided with a stop block to position the spring piece and prevent it from falling out of the second mounting cavity 63. The side of the second mounting cavity 63 facing the track body 5 has an opening 631 for the spring piece 62 to extend out and engage with the stop groove 52. The spring piece 62 is mounted on the grating frame 6. As the grating frame 6 slides axially and rotates circumferentially, during axial sliding, the spring piece 62 is always located in the stop groove 52 of the track body 5 to prevent the spring piece 62 from separating from the track body 5 and affecting subsequent positioning. During circumferential rotation, the track body 5 remains stationary, and the spring piece 62 passes through each... The stop groove 52 enhances the operating feel. The upper end of the second mounting cavity 63 is open, facilitating the installation of the spring piece 62. The spring piece 62 includes two support legs 621 and a connecting section 622 connecting the two support legs 621. The two support legs 621 are located inside the mounting cavity and abut against the side wall of the mounting cavity. The connecting section 622 is arc-shaped and extends out from the opening 631. The two support legs 621 of the spring piece 62 are supported in the mounting cavity to prevent the spring piece 62 from shaking, making it more stable during use. The opening 631 facilitates the spring piece 62 to extend out of the mounting cavity and cooperate with the track body 5. The arc-shaped connecting section 622 facilitates entry and exit from the stop groove 52, avoids jamming, and enhances the operating feel.

[0049] The outer casing 1 is also equipped with a bearing 12. The lower end of the bearing 12 is pressed onto the grating frame 6 and the track body 5, and the upper end of the bearing 12 is in contact with the display screen assembly 4. The grating frame 6 is provided with a number of elastic hooks 64 along its circumference. Each elastic hook 64 is hooked onto the upper end face of the bearing 12. The elastic hooks 64 are provided to further improve the stability of the bearing 12 and facilitate the hooks 64 to be hooked onto the bearing 12. Through the cooperation of the inner and outer rings of the bearing 12, when the knob 2 and the grating frame 6 rotate relative to the bracket 7, the coaxiality of the product is effectively guaranteed, the amount of shaking is reduced, and the product has a solid feel and low noise.

[0050] The circuit board 3 is covered with a waterproof rubber 34, and the bracket 7 is located above the waterproof rubber 34. The waterproof rubber 34 has protrusions 341 at the positions of the two microswitches to protect the circuit board 3 and prevent liquids and other substances from entering the outer casing 1 and affecting the use of the circuit board 3. The display assembly 4 is connected to the circuit board 3 through a flexible connecting piece 10. The inner casing 11 of the display screen has a first through groove 115 communicating with the accommodating cavity 721, and the waterproof rubber 34 has a second through groove 342 communicating with the accommodating cavity 721. The flexible connecting piece 10 passes through the first through groove 115, the accommodating cavity 721 and the second through groove 342 in sequence to connect with the circuit board 3. When the display assembly 4 slides, it will not affect the connection between it and the circuit board 3.

Claims

1. A rotary switch structure, comprising a housing (1) and a knob (2), wherein the knob (2) rotates circumferentially and slides axially relative to the housing (1), wherein the housing (1) contains a circuit board (3), a display assembly (4), a track body (5), and a grating frame (6), wherein the display assembly (4) is connected to the circuit board (3) and slides synchronously with the knob (2), wherein the grating frame (6) rotates and slides synchronously with the knob (2), wherein the circuit board (3) is provided with a first micro switch (31) and a photoelectric sensor (32), wherein the lower end of the grating frame (6) is provided with a plurality of equally spaced grating teeth (61) along its circumference, wherein each grating tooth (61) approaches or moves away from the photoelectric sensor (32) when the knob (2) rotates, characterized in that, The circuit board (3) is also provided with a second micro switch (33). The housing (1) is also provided with a bracket (7), a swing arm (8) and a stop pin (9). The swing arm (8) is located above the two micro switches and has a pressing part (81) corresponding to the position of the micro switches. The middle part of the swing arm (8) is hinged to the bracket (7), and one end is engaged with the display assembly (4) so ​​that when the knob (2) slides axially, it triggers the first micro switch (31) or the second micro switch (33). The stop pin (9) is located above the swing arm (8) and slides laterally on the bracket (7). The track body (5) is located on the grating frame (6). Inside, the track body (5) and the grating frame (6) slide synchronously relative to the support (7). The track body (5) is provided with an extension block (51). The extension block (51) is provided with a groove (511) for the end of the stop pin (9) to slide into and an inclined surface (512) located at the upper and lower ends of the groove (511). The outer side of the track body (5) is provided with several equally spaced stop grooves (52) along its circumference. The grating frame (6) is provided with a spring piece (62) corresponding to the stop groove (52) to achieve positioning in cooperation with the stop groove (52). The support (7) is provided with a return spring (71) to drive the stop pin (9) to slide towards the track body (5).

2. The knob (2) switch structure according to claim 1, characterized in that, The bracket (7) is provided with a columnar part (72) and a receiving groove (73) arranged inward and outward. The columnar part (72) is located inside the track body (5). The columnar part (72) is provided with a receiving cavity (721). The receiving cavity (721) is provided with a hinge shaft. The swing rod (8) is located inside the receiving cavity (721) and is hinged to the hinge shaft in the middle. The bottom wall of the receiving groove (73) is lower than the columnar part (72). The lower end of the grating frame (6) is located inside the receiving groove (73) and can slide axially and rotate circumferentially relative to the receiving groove (73). The bottom of the receiving groove (73) is provided with a notch (731) corresponding to the position of the photoelectric sensor (32) so that the grating teeth (61) can cooperate with the photoelectric sensor (32).

3. The knob (2) switch structure according to claim 2, characterized in that, The outer shell (1) is further provided with a display screen inner shell (11). The upper end of the display screen inner shell (11) is connected to the display screen assembly (4). The lower end of the display screen inner shell (11) is provided with a connecting part (111) and a guide plate (112) located inside the connecting part (111). The connecting part (111) is located inside the track body (5) and is connected to the track body (5). The connecting part (111) is provided with a slot (113) corresponding to the position of the extension block (51) for the end of the stop pin (9) to extend out. The columnar part (72) is located between the guide plate (112) and the connecting part (51). Between the parts (111), the guide plate (112) is provided with a groove (114) along its vertical direction, the inner wall of the columnar part (72) is provided with a protrusion (722), the protrusion (722) is located in the groove (114), the bracket (7) is provided with a connecting plate (74) on its inner side, the lower end of the connecting plate (74) is connected to one end of the swing rod (8), and the upper end of the connecting plate (74) abuts against the inner shell (11) of the display screen, so that when the display screen slides in the circumferential direction, the swing rod (8) is driven to swing and trigger the first micro switch (31) or the second micro switch (33).

4. The knob (2) switch structure according to claim 2 or 3, characterized in that, The columnar part (72) is provided with a first mounting cavity (75) along its transverse direction. There are two stop pins (9), and the ends of the two stop pins (9) extend from both sides of the first mounting cavity (75). The two ends of the reset spring (71) are respectively abutted against the two stop pins (9).

5. The knob (2) switch structure according to claim 1 or 2, characterized in that, The grating frame (6) is provided with a second mounting cavity (63) with an open upper end. The spring piece (62) is located in the second mounting cavity (63). The second mounting cavity (63) has an opening (631) on the side facing the track body (5) for the spring piece (62) to extend out and be positioned and cooperate with the stop groove (52).

6. The knob (2) switch structure according to claim 1 or 2, characterized in that, The outer casing (1) is also provided with a bearing (12). The lower end of the bearing (12) is pressed on the grating frame (6) and the track body (5). The upper end of the bearing (12) is in contact with the display screen assembly (4). The grating frame (6) is provided with a number of elastic hooks (64) along its circumference. Each elastic hook (64) is hooked onto the upper end face of the bearing (12).

7. The knob (2) switch structure according to claim 4, characterized in that, The circuit board (3) is covered with a waterproof rubber (34), the bracket (7) is located above the waterproof rubber (34), and the waterproof rubber (34) has a protrusion (341) at the position of the two micro switches.

8. The knob (2) switch structure according to claim 5, characterized in that, The spring (62) includes two support legs (621) and a connecting section (622) connecting the two support legs (621). The two support legs (621) are located in the mounting cavity and abut against the side wall of the mounting cavity. The connecting section (622) is arc-shaped and extends out from the opening (631).

9. The knob (2) switch structure according to claim 5, characterized in that, The columnar part (72) is provided with guide grooves (723) located at the upper and lower ends of the first mounting cavity (75). Both guide grooves (723) are connected to the first mounting cavity (75). Both stop pins (9) are provided with two guide sliders (92), and the two guide sliders (92) are slidably disposed in the corresponding guide grooves (723).

10. The knob (2) switch structure according to claim 7, characterized in that, The display assembly (4) is connected to the circuit board (3) via a flexible connecting piece (10). The inner shell (11) of the display is provided with a first through groove (115) communicating with the accommodating cavity (721). The waterproof rubber (34) is provided with a second through groove (342) communicating with the accommodating cavity (721). The flexible connecting piece (10) passes through the first through groove (115), the accommodating cavity (721) and the second through groove (342) in sequence and is connected to the circuit board (3).

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