Knob switch structure

Abstract

The invention relates to a knob switch structure which comprises a shell and a knob, the knob circumferentially rotates and axially slides relative to the shell, a circuit board, a display screen assembly, a rail body and a grating frame are arranged in the shell, the display screen assembly is connected with the circuit board and synchronously slides with the knob, and the grating frame is connected with the circuit board. The grating frame and the rotary knob rotate and slide synchronously, a first microswitch and a photoelectric sensor are arranged on the circuit board, a plurality of grating teeth distributed at equal intervals are arranged at the lower end of the grating frame in the circumferential direction of the grating frame, the grating teeth are rotationally close to or away from the photoelectric sensor on the rotary knob, and a second microswitch is further arranged on the circuit board. A support, a swing rod and a gear pin are further arranged in the shell, the middle of the swing rod is hinged to the support, and one end of the swing rod is matched with the display screen assembly. By adopting the technical scheme, the knob switch structure provided by the invention is compact in internal structure, and can rotate, pull up and press down in a limited space, so that dual operation is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile switches, and in particular to a knob switch structure. Background Art

[0002] With the rapid development of automotive electronics, more and more electrified functions are being integrated into vehicles, leading to higher requirements for control methods and appearance. At the same time, to meet the current demand for automotive technology, operational feel, and appearance, automakers are also introducing more and more new control methods and appearance designs.

[0003] Conventional rotary switches currently on the market can only perform a single rotation operation. Some models of rotary switches also have built-in display screens. A micro switch is set on the circuit board inside the switch, which can be triggered by pressing the micro switch to realize the function of the display screen. However, this type of rotary switch only supports a press-down operation and does not have a pull-up function. Summary of the Invention

[0004] Purpose of the present invention: In order to overcome the defects of the prior art, the present invention provides a knob switch structure, which has a compact internal structure and occupies a small space. It can be rotated and pulled up and pressed down in a limited space to achieve dual operation.

[0005] The technical solution of the present invention is as follows: a knob switch structure, comprising a housing and a knob, the knob rotating circumferentially and sliding axially relative to the housing, a circuit board, a display assembly, a track body and a grating frame being arranged in the housing, the display assembly being connected to the circuit board and sliding synchronously with the knob, the grating frame rotating and sliding synchronously with the knob, a first micro switch and a photoelectric sensor being arranged on the circuit board, a plurality of grating teeth distributed at equal intervals being arranged at the lower end of the grating frame along its circumference, each grating tooth approaching or leaving the photoelectric sensor when the knob is rotated, a second micro switch being further arranged on the circuit board, a bracket, a rocker arm and a shift pin being further arranged in the housing, the rocker arm being located above the two micro switches and corresponding to the position of the micro switches A pressing portion is provided, and the middle part of the rocker arm is hinged on the bracket, one end of which cooperates with the display screen assembly to trigger the first microswitch or the second microswitch when the knob slides axially. The shift pin is located above the rocker arm, and the shift pin is lateral slidingly arranged on the bracket. The track body is located on the inner side of the grating frame, and the track body and the grating frame slide synchronously relative to the bracket. An extension block is provided on the inner side of the track body, and the extension block is provided with a groove for the end of the shift pin to slide into and inclined surfaces at the upper and lower ends of the groove. A number of equally spaced shift grooves are provided on the outer surface of the track body along its circumference, and a spring is provided on the grating frame at a position corresponding to the shift groove for cooperating with the shift groove to achieve positioning. A return spring is provided on the bracket to drive the shift pin to slide toward the track body.

[0006] By adopting the above technical solution, the rotation operation of the knob and the dual operations of pulling up and pressing down can be realized, and the space occupied by the knob will not be increased. A shift pin is set on the inner side of the track body, and a track body is set on the outer side. Regardless of rotation operation or pulling up and pressing down operation, one track body is shared to enhance the operating feel, which can effectively save space and cost. When pulling up and pressing down, the track body cooperates with the shift pin, and the knob, display assembly, grating frame and track body all slide synchronously, and drive the rocker arm to swing, triggering the first microswitch or the second microswitch. 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, and is positioned with the shift slot and produces a click sound.

[0007] The present invention is further configured as follows: the bracket is provided with a columnar portion and a receiving groove arranged inward and outward, the columnar portion is located inside the track body, a receiving cavity is provided in the columnar portion, a hinge shaft is provided on the receiving cavity, the rocker arm is located in the receiving cavity, and the middle part is hinged to the hinge shaft, the bottom wall of the receiving groove is lower than the columnar portion, the lower end of the grating frame is located in the receiving groove, and can slide axially and rotate circumferentially relative to the receiving groove, and a notch is provided at the bottom of the receiving groove corresponding to the position of the photoelectric sensor so that the grating teeth can cooperate with the photoelectric sensor.

[0008] With the above further configuration, the structural layout is reasonable and the installation positions of the components are reasonably distributed without affecting the operation, so that the overall structure of the knob switch is compact and the space occupied by it during installation is effectively reduced.

[0009] The present invention is further provided with: a display screen inner shell is also provided in the outer shell, the upper end of the display screen inner shell is connected to the display screen assembly, the lower end of the display screen inner shell is provided with a connecting part and a guide plate located on the inner side of the connecting part, the connecting part is located on the inner side of the track body and is connected to the track body, a notch is provided on the connecting part corresponding to the position of the extension block, so that the end of the gear pin can extend out, the columnar part is located between the guide plate and the connecting part, a slide groove is provided on the guide plate along its vertical direction, a protrusion is provided on the inner side wall of the columnar part, the protrusion is located in the slide groove, a connecting plate is provided on the inner side of the bracket, the lower end of the connecting plate is connected to one end of the rocker arm, and the upper end of the connecting plate is in contact with the display screen inner shell, so that when the display screen slides circumferentially, the rocker arm is driven to swing and trigger the first microswitch or the second microswitch.

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

[0011] The present invention is further provided with: a first mounting cavity is provided on the columnar portion along its transverse direction, two shift pins are provided, the ends of the two shift pins extend from both sides of the first mounting cavity respectively, and the two ends of the return spring are respectively arranged to abut against the two shift pins.

[0012] The above-mentioned further setting is adopted to improve the smoothness of the axial sliding of the track body and the operational feel. A mounting column is provided at the opposite end of the two gear pins, and a reset spring is sleeved on the two mounting columns. When the track body slides axially, when the inclined surface of the extension block contacts the gear pin, the two gear pins will be pressed into the first mounting cavity. The two gear pins press the reset spring, and when the groove of the extension block corresponds to the gear pin, the reset spring resets the gear pin, and the end of the gear pin slides into the groove.

[0013] The present invention is further provided with: a second installation cavity with an open upper end is provided on the grating frame, the spring is provided in the second installation cavity, and an opening for the spring to extend out and to be positioned and matched with the gear slot is provided on the side of the second installation cavity facing the track body.

[0014] With the above-mentioned further arrangement, the shrapnel is installed on the grating frame. As the grating frame slides axially and rotates circumferentially, the shrapnel part is always located in the gear slot of the track body during axial sliding, thereby avoiding separation of the shrapnel from the track body and affecting subsequent positioning. During circumferential rotation, the track body remains stationary, and the shrapnel passes through each gear slot in turn, thereby enhancing the operating feel. The upper end of the second mounting cavity is open to facilitate the installation of the shrapnel.

[0015] The present invention is further configured as follows: a bearing is further provided in the outer shell, the lower end of the bearing is pressed onto the grating frame and the track body, the upper end of the bearing is in contact with the display screen assembly, and a plurality of elastic hooks are provided on the grating frame along its circumference, and each elastic hook is hooked on the upper end surface of the bearing.

[0016] By adopting the above-mentioned further setting, through the cooperation of the inner and outer rings of the bearing, when the knob and the grating frame rotate relative to the bracket, the coaxiality of the product is effectively guaranteed, the shaking amount is reduced, and the hand feel is heavy and the noise is small.

[0017] The present invention is further provided with: the circuit board outer cover is provided with waterproof rubber, the bracket is located above the waterproof rubber, and the waterproof rubber is provided with protrusions at the positions of the two micro switches.

[0018] By adopting the above-mentioned further configuration, the circuit board is protected to prevent liquids and other substances from entering the housing and affecting the use of the circuit board.

[0019] The present invention is further configured as follows: the spring piece includes two supporting feet and a connecting section connecting the two supporting feet, the two supporting feet are located in the installation cavity and are arranged to abut against the side wall of the installation cavity, and the connecting section is arranged in an arc shape and extends from the opening.

[0020] With the above-mentioned further arrangement, the two supporting legs of the shrapnel are supported in the installation cavity to prevent the shrapnel from shaking, making it more stable when in use. The through groove facilitates the shrapnel to extend from the installation cavity and cooperate with the track body. The connecting section is arranged in an arc shape to facilitate entering and exiting the gear slot, avoid jamming, and enhance the operating feel.

[0021] The present invention is further configured as follows: the columnar portion is provided with guide grooves located at the upper and lower ends of the first mounting cavity, both guide grooves are communicated with the first mounting cavity, and both gear pins are provided with two guide sliders, which are slidably arranged in the corresponding guide grooves.

[0022] By adopting the above-mentioned further arrangement, when the shift pin slides in the first mounting cavity, the movement is smooth, without deviation, and the shift pin always remains stable, and the sliding of the track body will not cause the shift pin to tilt.

[0023] The present invention is further configured as follows: the display screen assembly is connected to the circuit board via a flexible connecting piece, the display screen inner shell 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 be connected to the circuit board.

[0024] With the above further configuration, when the display screen assembly slides, the connection between the display screen assembly and the circuit board will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention; Figure 2 is a cross-sectional view of a specific embodiment of the present invention; Figure 3 A cross-sectional view of another embodiment of the present invention; Figure 4 for Figure 3 Enlarged view of part A; Figure 5Schematic diagram of a track body and a spring piece according to a specific embodiment of the present invention; Figure 6 A schematic diagram of a bearing and a bracket according to a specific embodiment of the present invention; Figure 7 is a schematic diagram of a bracket according to a specific embodiment of the present invention; Figure 8 is a cross-sectional view of a bracket according to a specific embodiment of the present invention; Figure 9 A cross-sectional view of the bracket in another direction according to a specific embodiment of the present invention; Figure 10 is a schematic diagram of a grating frame according to a specific embodiment of the present invention; Figure 11 is a cross-sectional view of an inner housing of a display screen according to a specific embodiment of the present invention; Figure 12 A schematic diagram of an inner housing of a display screen according to a specific embodiment of the present invention; Figure 13 Schematic diagram of a grating frame and a photoelectric sensor according to a specific embodiment of the present invention; Figure 14 Schematic diagram of waterproof rubber according to a specific embodiment of the present invention.

[0026] In the figure, 1. outer shell; 11. display screen inner shell; 111. connecting portion; 112. guide plate; 113. notch; 114. slide groove; 115. first through-slot; 12. bearing; 2. knob; 21. knob inner shell; 3. circuit board; 31. first micro switch; 32. photoelectric sensor; 33. second micro switch; 34. waterproof rubber; 341. raised portion; 342. second through-slot; 4. display screen assembly; 5. track body; 51. extension block; 511. groove; 512. inclined surface; 52. gear position Groove; 6. Grating frame; 61. Grating teeth; 62. Spring piece; 621. Support foot; 622. Connecting section; 63. Second mounting cavity; 631. Opening; 64. Elastic hook; 7. Bracket; 71. Return spring; 72. Columnar portion; 721. Accommodating cavity; 722. Protrusion; 723. Guide groove; 73. Accommodating groove; 731. Notch; 74. Connecting plate; 75. First mounting cavity; 8. Rocker; 81. Pressing portion; 9. Shift pin; 91. Mounting column; 92. Guide slider; 10. Flexible connecting piece. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in this embodiment with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that in the description of the present invention, all directional indications (such as up, down, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being described. In the description of this disclosure, "several" means at least two, such as two or three, unless otherwise specifically defined.

[0030] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] like Figure 1-14As shown, a knob switch structure includes a shell 1 and a knob 2. The knob 2 is a crystal knob 2, which is more beautiful and allows the content of the display screen assembly 4 to be intuitively seen. A knob inner shell 21 is provided below the knob 2, which rotates circumferentially and slides axially with the knob 2. The knob 2 rotates circumferentially and slides axially relative to the shell 1. A circuit board 3, a display screen assembly 4, a track body 5 and a grating frame 6 are provided in the shell 1. The display screen 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. A first micro switch 31 and a photoelectric sensor 32 are provided on the circuit board 3. The lower end of the grating frame 6 is provided with a plurality of gratings distributed at equal intervals along its circumference. Teeth 61, each grating tooth 61 approaches or leaves the photoelectric sensor 32 when the knob 2 is rotated, and the light signal of the photoelectric sensor 32 is connected when the grating tooth 61 leaves the photoelectric sensor 32. The photoelectric sensor 32 is an optical coupler; the circuit board 3 is also provided with a second micro switch 33, and the housing 1 is also provided with a bracket 7, a rocker rod 8 and a gear pin 9. The rocker rod 8 is located above the two micro switches and is provided with a pressing portion 81 corresponding to the position of the micro switch. The lower end surface of the pressing portion 81 is arranged in an arc shape, which makes the triggering of the micro switch smoother. The middle part of the rocker rod 8 is hinged on the bracket 7, and one end of it cooperates with the display assembly 4 to trigger the first micro switch 31 or the second micro switch 33 when the knob 2 slides axially. The shift pin 9 is located above the rocker arm 8, and the shift pin 9 is slidably arranged on the bracket 7 in the horizontal direction. The track body 5 is located on the inner side of 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 on the inner side of the track body 5, and a groove 511 for the end of the shift pin 9 to slide into and inclined surfaces 512 at the upper and lower ends of the groove 511 are provided on the extension block 51. A plurality of shift grooves 52 distributed at equal intervals are provided on the outer surface of the track body 5 along its circumference. A spring 62 is provided on the grating frame 6 at a position corresponding to the shift groove 52 for cooperating with the shift groove 52 to achieve positioning. A return spring 71 is provided on the bracket 7 to drive the shift pin 9 to slide in the direction of the track body 5, which can realize the rotation operation of the knob 2 and the pull-up and Double operation of pressing down, and it will not increase the space occupied by the knob 2. A gear pin 9 is set on the inner side of the track body 5, and a track body 5 is set on the outer side. No matter it is a rotation operation or an upward pull-down operation, one track body 5 is shared to enhance the operating feel, which can effectively save space and cost. When the upward pull-down operation is performed, the track body 5 cooperates with the gear pin 9, and the knob 2, the display assembly 4, the grating frame 6 and the track body 5 all slide synchronously, and drive the rocker bar 8 to swing, triggering the first microswitch 31 or the second microswitch 33. When the knob 2 is rotated, the track body 5 cooperates with the spring 62, and the knob 2, the grating frame 6 and the spring 62 rotate synchronously. The spring 62 slides on the track body 5, and is positioned with the gear slot 52 and a click sound is generated.

[0032] The bracket 7 is provided with a columnar portion 72 and a receiving groove 73 arranged inward and outward. The columnar portion 72 is located on the inner side of the track body 5. A receiving cavity 721 is provided in the columnar portion 72. A hinge shaft is provided on the receiving cavity 721. The rocker arm 8 is located in the receiving cavity 721, and the middle part is hinged on the hinge shaft. The bottom wall of the receiving groove 73 is set lower than the columnar portion 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. A notch 731 is provided at the bottom of the receiving groove 73 corresponding to the position of the photoelectric sensor 32 so that the grating teeth 61 can cooperate with the photoelectric sensor 32. The structural layout is reasonable, and the installation positions of various components are reasonably distributed without affecting the operation, so that the overall structure of the knob 2 switch is compact, effectively reducing the space occupied during its installation.

[0033] The outer shell 1 is also 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 portion 111 and a guide plate 112 located inside the connecting portion 111, the connecting portion 111 is located on the inner side of the track body 5 and is connected to the track body 5, a notch 113 is provided on the connecting portion 111 at a position corresponding to the extension block 51, so that the end of the shift pin 9 can extend, the columnar portion 72 is located between the guide plate 112 and the connecting portion 111, and a slide groove 114 is provided on the guide plate 112 along its vertical direction, a protrusion 722 is provided on the inner side wall of the columnar portion 72, and the protrusion 722 is located in the slide groove 114, a connecting plate 74 is provided on the inner side of the bracket 7, the lower end of the connecting plate 74 is connected to one end of the rocker 8, and a connecting port is provided on the connecting plate 74 The rocker arm 8 is provided with a connecting block, which is located in the connecting port. The upper end of the connecting plate 74 contacts the inner shell 11 of the display screen, so that when the display screen slides circumferentially, the rocker arm 8 is driven to swing and trigger the first microswitch 31 or the second microswitch 33. The inner shell 11 of the display screen slides synchronously with the knob 2. During the operation of pulling up and pressing down the knob 2, the inner shell 11 of the display screen slides synchronously with the track body 5 and slides relative to the bracket 7. The cooperation between the guide plate 112 and the bracket 7 through the protrusion 722 and the slide groove 114 can play a guiding role, so that when the inner shell 11 of the display screen slides, the structure is stable and does not deviate. The connecting plate 74 is connected to one end of the rocker arm 8. During the operation of pulling up and pressing down the knob 2, the rocker arm 8 swings relative to the bracket 7 to trigger the first microswitch 31 or the second microswitch 33. The operating structure is simple and has good stability.

[0034] The columnar portion 72 is provided with a first mounting cavity 75 along its transverse direction, and two shift pins 9 are provided, and the ends of the two shift pins 9 extend from both sides of the first mounting cavity 75 respectively. The two ends of the return spring 71 are respectively set to contact the two shift pins 9 to improve the stability of the axial sliding of the track body 5 and the operating feel. The two shift pins 9 are provided at the ends facing each other. The return spring 71 is sleeved on the two mounting columns 91. When the track body 5 slides axially, when the inclined surface 512 of the extension block 51 contacts the shift pin 9, it will press the two shift pins 9 into the first mounting cavity 75, and the two shift pins 9 press the return spring 71, and when the groove 511 of the extension block 51 corresponds to the gear pin 9, the reset spring 71 resets the gear pin 9, and the end of the gear pin 9 slides into the groove 511; the columnar portion 72 is provided with guide grooves 723 located at the upper and lower ends of the first mounting cavity 75, and the two guide grooves 723 are both communicated with the first mounting cavity 75, and the two gear pins 9 are provided with two guide sliders 92, and the two guide sliders 92 are slid in the corresponding guide grooves 723, so that when the gear pin 9 slides in the first mounting cavity 75, the movement is smooth, without deviation, and always remains smooth, and the gear pin 9 will not be tilted due to the sliding of the track body 5.

[0035] The grating frame 6 is provided with a second mounting cavity 63 with an open upper end, and the spring piece 62 is provided in the second mounting cavity 63. A stopper is also provided at the upper end of the second mounting cavity 63 to position the spring piece and prevent it from escaping from the second mounting cavity 63. The second mounting cavity 63 is provided with an opening 631 for the spring piece 62 to extend out and to be positioned and matched with the shift groove 52 on the side facing the track body 5. The spring piece 62 is installed on the grating frame 6. As the grating frame 6 slides axially and rotates circumferentially, part of the spring piece 62 is always located in the shift groove 52 of the track body 5 during axial sliding, so as 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 gear slot 52 enhances the operational feel, and the upper end of the second mounting cavity 63 is open, which is convenient for the installation of the spring clip 62; the spring clip 62 includes two supporting feet 621 and a connecting section 622 connecting the two supporting feet 621. The two supporting feet 621 are located in the mounting cavity and are set to abut against the side wall of the mounting cavity. The connecting section 622 is set in an arc shape and extends from the opening 631. The two supporting feet 621 of the spring clip 62 are supported in the mounting cavity to prevent the spring clip 62 from shaking, making it more stable when in use. The opening 631 facilitates the spring clip 62 to extend from the mounting cavity and cooperate with the track body 5. The connecting section 622 is set in an arc shape to facilitate entry and exit of the gear slot 52, avoid jamming, and enhance the operational feel.

[0036] A bearing 12 is also provided in the housing 1. The lower end of the bearing 12 is pressed onto 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 plurality of elastic hooks 64 along its circumference. Each elastic hook 64 is hooked on the upper end face of the bearing 12. The elastic hook 64 is provided to further improve the stability of the bearing 12 and facilitate the elastic hook 64 to be hooked on 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 shaking amount is reduced, and the hand feel is heavy and the noise is small.

[0037] The outer cover of the circuit board 3 is provided with a waterproof rubber 34, and the bracket 7 is located above the waterproof rubber 34. The waterproof rubber 34 is provided with a protrusion 341 at the position of the two micro switches to protect the circuit board 3 and prevent liquids and other substances from entering the outer shell 1 and affecting the use of the circuit board 3; the display screen assembly 4 is connected to the circuit board 3 through a flexible connecting piece 10, and the display screen inner shell 11 is provided with a first through groove 115 communicating with the accommodating cavity 721, and 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 to connect with the circuit board 3. When the display screen assembly 4 slides, it will not affect the connection between it and the circuit board 3.

Claims

1. A knob 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 a circuit board (3), a display screen assembly (4), a track body (5) and a grating frame (6) are provided in the housing (1), wherein the display screen 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 a first micro switch (31) and a photoelectric sensor (32) are provided on the circuit board (3), wherein a plurality of grating teeth (61) are distributed at equal intervals along the circumference of the lower end of the grating frame (6), wherein each grating tooth (61) approaches or leaves the photoelectric sensor (32) when the knob (2) is rotated, and wherein the grating teeth (61) are rotated to approach or leave the photoelectric sensor (32), wherein the grating teeth (61) are rotated to approach or leave the photoelectric sensor (32), and ... The circuit board (3) is also provided with a second micro switch (33), and the housing (1) is also provided with a bracket (7), a rocker (8) and a shift pin (9). The rocker (8) is located above the two micro switches, and a pressing portion (81) is provided at the position corresponding to the micro switch. The middle part of the rocker (8) is hinged on the bracket (7), and one end thereof cooperates with the display screen assembly (4) to trigger the first micro switch (31) or the second micro switch (33) when the knob (2) slides axially. The shift pin (9) is located above the rocker (8), and the shift pin (9) is laterally slidable on the bracket (7). The track body (5) is located on the grating frame (6). The track body (5) and the grating frame (6) slide synchronously relative to the bracket (7). An extension block (51) is provided on the inner side of the track body (5). The extension block (51) is provided with a groove (511) for the end of the shift pin (9) to slide into and inclined surfaces (512) located at the upper and lower ends of the groove (511). A plurality of shift grooves (52) distributed at equal intervals are provided on the outer surface of the track body (5) along its circumference. A spring (62) is provided on the grating frame (6) at a position corresponding to the shift groove (52) for cooperating with the shift groove (52) to achieve positioning. A return spring (71) is provided on the bracket (7) for driving the shift pin (9) to slide toward 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 portion (72) and a receiving groove (73) arranged inward and outward, the columnar portion (72) is located on the inner side of the track body (5), and a receiving cavity (721) is provided in the columnar portion (72). A hinge shaft is provided on the receiving cavity (721), the rocker (8) is located in the receiving cavity (721), and the middle part is hinged on the hinge shaft, the bottom wall of the receiving groove (73) is lower than the columnar portion (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), and a notch (731) is provided at the bottom of the receiving groove (73) 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 portion (111) and a guide plate (112) located inside the connecting portion (111), the connecting portion (111) is located inside the track body (5) and is connected to the track body (5), a notch (113) is provided on the connecting portion (111) at a position corresponding to the extension block (51) for the end of the shift pin (9) to extend, and the columnar portion (72) is located between the guide plate (112) and the connecting portion. The guide plate (112) is provided with a slide groove (114) along its vertical direction between the parts (111), the inner wall of the columnar part (72) is provided with a protrusion (722), and the protrusion (722) is located in the slide groove (114). The inner side of the bracket (7) is provided with a connecting plate (74), the lower end of the connecting plate (74) is connected to one end of the rocker (8), and the upper end of the connecting plate (74) is in contact with the inner shell (11) of the display screen, so that when the display screen slides circumferentially, the rocker (8) is driven to swing to 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: A first mounting cavity (75) is provided on the columnar portion (72) along its transverse direction. Two shift pins (9) are provided. Ends of the two shift pins (9) extend from two sides of the first mounting cavity (75), and both ends of the return spring (71) are respectively arranged to contact the two shift 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 arranged in the second mounting cavity (63), and the second mounting cavity (63) is provided with an opening (631) for the spring piece (62) to extend out and to be positioned and matched with the shifting groove (52) on a side facing the track body (5).

6. The knob (2) switch structure according to claim 1 or 2, characterized in that: A bearing (12) is further provided in the housing (1), the lower end of the bearing (12) is pressed onto 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), and a plurality of elastic hooks (64) are provided on the grating frame (6) along its circumference, and each elastic hook (64) is hooked onto the upper end surface of the bearing (12).

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

8. The knob (2) switch structure according to claim 5, characterized in that: The spring (62) comprises two supporting legs (621) and a connecting section (622) connecting the two supporting legs (621). The two supporting legs (621) are located in the installation cavity and are arranged to abut against the side wall of the installation cavity. The connecting section (622) is arranged in an arc shape and extends from the opening (631).

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

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

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