Knob module

Abstract

The utility model belongs to the technical field of knobs, and discloses a knob module. The knob module comprises a base, a rotating assembly, a main circuit board, a sensing assembly, a display assembly and a rear cover, wherein the base comprises a sleeving part and an extending part; the rotary assembly comprises a rotary knob and an elastic positioning piece, the rotary knob rotationally sleeves the sleeving part, the rotary knob is provided with a containing cavity, the extending part is located in the containing cavity, a mounting groove is formed in the end, close to the cavity bottom of the containing cavity, of the extending part, the cavity bottom of the containing cavity is provided with a wavy surface, and the elastic positioning piece is arranged in the mounting groove; one end of the elastic positioning piece abuts against or is connected with the groove bottom of the mounting groove, and the other end of the elastic positioning piece abuts against the wavy surface; the main circuit board is fixed at one end, away from the bottom of the accommodating cavity, of the extending part; the sensing assembly comprises a Hall sensor and a magnetic ring, the Hall sensor is fixed to the main circuit board, and the magnetic ring is fixed to the cavity bottom of the containing cavity; the display assembly and the rear cover are both fixed to the base. The device is high in integration degree, small in occupied space and reliable, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to knob technical field especially relates to a knob module. BACKGROUND

[0002] With the continuous updating of science and technology, electronic products are rapidly updated and iterated, wherein various different control switches need to be used, and the knob is a commonly used switch control product in the prior art, such as being applied to products such as treadmills, rowing machines, household appliances, smart homes, and automobile air conditioner controllers. By rotating the knob, the function mode or the parameter size can be changed.

[0003] In the prior art, the outer knob, the encoder, and the display screen are supplied to the machine assembling factory in the form of independent modules for assembly, and then software control programs are recorded and other work is performed, the degree of integration is low, the number of parts required for assembly by the machine assembling factory is increased, the production efficiency is reduced, the production process is relatively complicated, the production cycle is long, the intermediate turnover cost and time are increased. In addition, the assembled knob module occupies a large space and has poor reliability.

[0004] Therefore, there is an urgent need for a knob module to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a knob module, which has a high degree of integration, reduces the number of parts required for assembly by the machine assembling factory, improves the production efficiency, occupies a small space, and is relatively reliable.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A knob module comprises:

[0008] A base comprises a sleeving portion and a protruding portion connected to the sleeving portion;

[0009] A rotating assembly comprises a knob and an elastic positioning piece, the knob is sleeved on the sleeving portion, the knob is provided with a containing cavity, the protruding portion is located in the containing cavity, at least two mounting grooves are arranged at one end of the protruding portion close to the bottom of the containing cavity, the bottom of the containing cavity is provided with a wave surface, the elastic positioning piece is arranged in the mounting groove, one end of the elastic positioning piece abuts or connects with the groove bottom of the mounting groove, and the other end of the elastic positioning piece abuts with the wave surface;

[0010] A main circuit board is fixed at one end of the protruding portion away from the bottom of the containing cavity;

[0011] The sensor assembly includes a Hall sensor and a magnetic ring, the Hall sensor is fixed to the main circuit board and penetrates the extension part, the magnetic ring is fixed to the bottom of the accommodating cavity, when the knob rotates, the magnetic ring rotates, and the magnetic field detected by the Hall sensor changes;

[0012] The display assembly is fixed to the base and located in the accommodating cavity and electrically connected with the main circuit board;

[0013] The rear cover is fixed to the base and abuts the knob against the base.

[0014] In some possible implementation manners, the extension part is provided with at least two positioning protrusions, the at least two positioning protrusions are arranged in one-to-one correspondence with the at least two mounting grooves, the mounting grooves extend from the end face of the extension part to the positioning protrusions, the main circuit board is provided with a first positioning hole, and the positioning protrusion is inserted into the first positioning hole.

[0015] In some possible implementation manners, the bottom of the accommodating cavity is provided with a clamping groove, the magnetic ring is clamped into the clamping groove, one of the magnetic ring and the clamping groove is provided with a first protrusion, and the other is provided with a first recess, the first protrusion and the first recess are clamped, and when the knob rotates, the magnetic ring can be driven to rotate.

[0016] In some possible implementation manners, the display assembly includes a screen seat, a first fastener and a display screen, the first fastener is sequentially inserted through the screen seat, the main circuit board and fixedly connected with the extension part, and the display screen is detachably connected to the screen seat.

[0017] In some possible implementation manners, the display assembly further includes a glass cover, the glass cover covers the screen seat, the bottom surface of the glass cover is sealingly connected with the top of the screen seat through sealing glue, and the side wall of the main circuit board is sealingly connected with the inner side wall of the screen seat through sealing glue.

[0018] In some possible implementation manners, the display assembly further includes a light guide ring and an LED lamp film sheet, the screen seat is provided with a clamping groove, an annular groove and a stepped groove, the display screen is clamped with the clamping groove, the light guide ring is clamped with the annular groove, the LED lamp film sheet is clamped with the stepped groove and covers the light guide ring, and the top surface of the LED lamp film sheet is flush with the top surface of the screen seat.

[0019] In some possible implementation manners, the knob includes a sleeve knob and an outer knob, the sleeve knob is rotatably sleeved on the sleeving part, the outer knob is sleeved on the sleeve knob, one of the outer knob and the sleeve knob is provided with a second protrusion, and the other is provided with a second recess, the second protrusion and the second recess are clamped, and when the outer knob rotates, the sleeve knob can be driven to rotate.

[0020] In some possible implementation manners, the elastic positioning member comprises an elastic member and a positioning column, the positioning column is in sliding connection with the mounting groove, one end of the positioning column is provided with a guide groove, one end of the elastic member is in abutment with the groove bottom of the mounting groove, the other end of the elastic member extends into the guide groove and is in abutment with the groove bottom of the guide groove, and the other end of the positioning column is provided with a spherical part, and the spherical part is in abutment with the wave surface.

[0021] In some possible implementation manners, the knob module further comprises a wire harness, the wire harness passes through the rear cover and the base and is connected with the main circuit board.

[0022] In some possible implementation manners, the outer side wall of the knob is provided with a concave-convex structure.

[0023] The utility model discloses a beneficial effect:

[0024] The utility model provides a knob module, including base, rotation subassembly, main circuit board, sensing assembly, display subassembly and rear cover, when running, through rotating knob, drive magnet ring rotation, make the change that hall sensor detects the magnetic field, and then carry out function conversion or adjust the size of function parameter. The rotation subassembly, sensing assembly and display subassembly are integrated together, improve the degree of integration, reduce the quantity of parts required to assemble of group machine factory, improve production efficiency. Without influencing the rotation of knob, the base is inserted into the accommodating cavity of knob, and the sensing assembly and the display assembly are located in the accommodating cavity of the knob, so that the overall structure of the knob module occupies a small space and has a compact structure. In addition, the encoder function is realized by using the magnetic ring and the Hall sensor, which further optimizes the module structure, so that the knob module can be made thinner and smaller, and longer service life and higher stability of the knob module are realized, and reliability is ensured. By arranging the wave surface on the bottom of the accommodating cavity, the elastic positioning member abuts against the wave surface, and the rotation of the knob is positioned, which is convenient for processing and occupies a small space. The rear cover is arranged to position the knob during installation. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the first perspective structural schematic drawing of the knob module provided by the utility model;

[0026] Figure 2 It is the second perspective structural schematic drawing of the knob module provided by the utility model;

[0027] Figure 3 It is the explosion drawing of the knob module provided by the utility model;

[0028] Figure 4 It is the first sectional view of the knob module provided by the utility model;

[0029] Figure 5 is the second sectional view of the rotary knob module provided by the utility model;

[0030] Figure 6 is the structural schematic view of the screen seat related by the utility model.

[0031] In the drawing:

[0032] 1, base; 11, sleeve part; 12, extension part; 121, mounting groove; 122, positioning protrusion;

[0033] 2, rotating assembly; 21, rotary knob; 211, containing cavity; 212, wave surface; 213, clamping groove; 214, knob sleeve; 2141, second groove; 215, outer knob; 2151, second protrusion; 22, elastic positioning member; 221, elastic member; 222, positioning column;

[0034] 3, main circuit board;

[0035] 41, hall sensor; 42, magnetic ring; 421, first groove;

[0036] 5, display assembly; 51, screen seat; 511, clamping groove; 512, annular groove; 513, step groove; 514, glue filling groove; 52, first fastener; 53, display screen; 54, glass cover; 55, light guide ring; 56, LED lamp film piece;

[0037] 6, rear cover; 7, wire harness; 8, second fastener. DETAILED DESCRIPTION

[0038] The utility model will be further explained in detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all the structures.

[0039] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] like Figures 1 to 6 As shown, this utility model provides a knob module that can be applied to multimedia control, air conditioning control, home appliance control, and washing machine and dryer fields. By rotating the knob 21, functions can be switched, or the volume, power, temperature or airflow can be adjusted, or the mode can be selected. The knob module includes a base 1, a rotating assembly 2, a sensing assembly, a display assembly 5, and a back cover 6. The base 1 includes a fitting portion 11 and an extension portion 12 connected to the fitting portion 11. The rotating assembly 2 includes a knob 21 and an elastic positioning member 22. The knob 21 is rotatably fitted onto the fitting portion 11. The knob 21 has a receiving cavity 211. The extension portion 12 is located inside the receiving cavity 211. At least two mounting grooves 121 are provided at one end of the extension portion 12 near the bottom of the receiving cavity 211. The bottom of the receiving cavity 211 has a corrugated surface 212. The elastic positioning member 22 is disposed in the mounting groove 121. One end of the elastic positioning member 22 abuts or connects to the bottom of the mounting groove 121, and the other end of the elastic positioning member 22 abuts against the corrugated surface 212. The main circuit board 3 is fixed to the end of the extension 12 away from the bottom of the receiving cavity 211; the sensing component includes a Hall sensor 41 and a magnetic ring 42. The Hall sensor 41 is fixed to the main circuit board 3 and passes through the extension 12; the magnetic ring 42 is fixed to the bottom of the receiving cavity 211. Optionally, the magnetic ring 42 is made by first plastic coating and then magnetizing to ensure the stability of the magnetic ring 42. In addition, the magnetic ring 42 is made of injection-molded magnet, which has good plasticity; when the knob 21 is rotated, it drives the magnetic ring 42 to rotate, causing the magnetic field detected by the Hall sensor 41 to change; the display component 5 is fixed to the base 1 and located inside the receiving cavity 211, and is electrically connected to the main circuit board 3; the back cover 6 is fixed to the base 1 and can hold the knob 21 against the base 1.

[0043] In the running time, by rotating the knob 21, the magnetic ring 42 is driven to rotate, the magnetic field detected by the Hall sensor 41 changes, and then the function conversion or the size of the function parameter is adjusted. The rotation assembly 2, the sensing assembly and the display assembly 5 are integrated together, the degree of integration is improved, the number of parts required for assembly in the factory is reduced, and the production efficiency is improved. While not affecting the rotation of the knob 21, the base 1 is inserted into the containing cavity 211 of the knob 21, the sensing assembly and the display assembly 5 are located in the containing cavity 211 of the knob 21, the occupied space of the overall structure of the knob module is small, and the structure is compact. In addition, the magnetic ring 42 and the Hall sensor 41 are used to realize the encoder function, the module structure is further optimized, the knob module can be made thinner and smaller, and longer service life and higher stability of the knob module are realized, and the reliability is ensured. The wave surface 212 is arranged at the bottom of the containing cavity 211, the elastic positioning piece 22 abuts against the wave surface 212, the rotation of the knob 21 is positioned, machining is facilitated, and the occupied space is small. The rear cover 6 is arranged, and the installation of the knob 21 is positioned.

[0044] Optionally, in the embodiment, the extending part 12 is provided with at least two positioning protrusions 122, and the at least two positioning protrusions 122 are arranged one by one corresponding to the at least two mounting grooves 121. The mounting groove 121 extends from the end face of the extending part 12 to the positioning protrusion 122, and the main circuit board 3 is provided with a first positioning hole. The positioning protrusion 122 is inserted into the first positioning hole. The mounting groove 121 extends from the end face of the extending part 12 to the positioning protrusion 122, the structure is compact, the occupied space of the main circuit board 3 and the extending part 12 to the containing cavity 211 of the knob 21 is reduced, and at the same time, the positioning protrusion 122 is inserted into the first positioning hole of the main circuit board 3. When the main circuit board 3 is installed, the positioning effect of the main circuit board 3 can be realized.

[0045] Optionally, as shown in Figure 3 The bottom of the containing cavity 211 is provided with a clamping groove 213, the magnetic ring 42 is clamped into the clamping groove 213, one of the magnetic ring 42 and the clamping groove 213 is provided with a first protrusion, and the other is provided with a first recess 421. The first protrusion and the first recess 421 are clamped, so that the magnetic ring 42 can be driven to rotate when the knob 21 rotates. In this way, the magnetic ring 42 can be conveniently installed and removed, and the rotation of the magnetic ring 42 together with the knob 21 can be ensured. In the embodiment, the inner side wall of the magnetic ring 42 is provided with the first recess 421, and the inner side wall of the clamping groove 213 is provided with the first protrusion.

[0046] Optionally, the display assembly 5 comprises a screen seat 51, a first fastener 52 and a display screen 53, the first fastener 52 is sequentially connected with the screen seat 51, the main circuit board 3 and the extension part 12, and the display screen 53 is detachably connected to the screen seat 51. In this way, the display assembly 5 is convenient to install and disassemble. In addition, if it is necessary to replace the display screen 53 of different types, only the display screen 53 and the corresponding screen seat 51 need to be replaced, without making great changes to the whole structure, thereby improving the applicability of the knob module. Optionally, the display screen 53 is a TFT screen. In addition, the first fastener 52 is a screw, and the screw is threadedly connected with the internal threaded hole of the extension part 12. Optionally, the screen seat 51 is provided with a second positioning hole, and the positioning protrusion 122 is inserted into the second positioning hole. In this way, the positioning of the screen seat 51 can be realized when the screen seat 51 is installed.

[0047] Optionally, the display assembly 5 further comprises a glass cover 54, and the glass cover 54 covers the screen seat 51 to protect the display assembly 5. In order to further improve the applicability of the knob module, the knob module is waterproofed, the bottom surface of the glass cover 54 is sealingly connected with the top of the screen seat 51 through sealing glue, and the side wall of the main circuit board 3 is sealingly connected with the inner side wall of the screen seat 51 through sealing glue. Specifically, as shown in Figure 6 the top of the screen seat 51 is provided with a glue pouring groove 514, and the sealing glue is poured into the glue pouring groove 514, so that the sealing connection between the bottom surface of the glass cover 54 and the top of the screen seat 51 can be realized. In addition, it can be understood that, in order to achieve better waterproof effect and improve the use of the product in harsh environments, the display screen 53, the Hall sensor 41 and the main circuit board 3 can also be sealed by spraying three-proof paint.

[0048] Optionally, the display assembly 5 further comprises a light guide ring 55 and an LED lamp film sheet 56, the screen seat 51 is provided with a clamping groove 511, an annular groove 512 and a stepped groove 513, the display screen 53 is clamped with the clamping groove 511, the light guide ring 55 is clamped with the annular groove 512, the LED lamp film sheet 56 is clamped with the stepped groove 513 and covers the light guide ring 55, and the top surface of the LED lamp film sheet 56 is flush with the top surface of the screen seat 51. In this way, the display screen 53, the light guide ring 55 and the LED lamp film sheet 56 are convenient to install and disassemble. By arranging the LED lamp film sheet 56, auxiliary lighting is achieved, and the atmosphere is improved. By arranging the light guide ring 55, the light distribution is more uniform.

[0049] Optionally, the knob module further comprises a wire harness 7, and the wire harness 7 passes through the rear cover 6 and the base 1 and is connected with the main circuit board 3. In this way, the installation of the wire harness 7 is facilitated.

[0050] In the embodiment, the signal line of the Hall sensor 41 and the signal line of the display screen 53 are integrated and formed into one output port to be connected with the main circuit board 3, so that the number of output lines can be reduced and the circuit can be simplified. In addition, the slave chip is arranged on the control board of the display screen 53, which is used to process the Hall sensor 41 and the switching signal of the Hall sensor 41, and then feedback to the master chip of the main circuit board 3. The master chip sends a command to the slave chip for display of the display screen 53. The Hall sensor 41 signal is first analyzed and processed by the slave chip, and then communicated between the slave chip and the master chip, so that the processing of the Hall sensor 41 signal by the master chip is reduced, and the software control of the master chip is simplified.

[0051] Optionally, the knob 21 comprises a sleeve knob 214 and an outer knob 215. The sleeve knob 214 is sleeved on the sleeve portion 11, and the outer knob 215 is sleeved on the sleeve knob 214. One of the outer knob 215 and the sleeve knob 214 is provided with a second protrusion 2151, and the other is provided with a second groove 2141. The second protrusion 2151 and the second groove 2141 are connected, so that the sleeve knob 214 can be driven to rotate when the outer knob 215 rotates. In this way, the sleeve knob 214 and the outer knob 215 can be conveniently installed and removed, and the outer knob 215 can be ensured to rotate together with the sleeve knob 214. In the embodiment, the inner side wall of the outer knob 215 is provided with the second protrusion 2151, and the outer side wall of the sleeve knob 214 is provided with the second groove 2141. Optionally, in the embodiment, the top surface of the glass cover 54 is flush with the top surface of the outer knob 215, and the distance from the top surface of the glass cover 54 to the bottom surface of the outer knob 215 is only 12 mm.

[0052] Optionally, the elastic positioning member 22 comprises an elastic member 221 and a positioning column 222. In the embodiment, the elastic member 221 is a spring, and the positioning column 222 is in sliding connection with the mounting groove 121. One end of the positioning column 222 is provided with a guide groove, one end of the elastic member 221 abuts against the groove bottom of the mounting groove 121, the other end of the elastic member 221 extends into the guide groove and abuts against the groove bottom of the guide groove, and the other end of the positioning column 222 is provided with a spherical portion which abuts against the wavy surface 212. By arranging the elastic member 221 and the positioning column 222, the structure is simple and convenient to disassemble. By slidingly connecting the positioning column 222 with the mounting groove 121 and extending the elastic member 221 into the guide groove, reliable abutment between the positioning column 222 and the wavy surface 212 can be achieved. In other embodiments, the elastic positioning member 22 comprises an elastic member 221 and a ball. One end of the elastic member 221 is fixedly connected with the groove bottom of the mounting groove 121, and the other end of the elastic member 221 is fixedly connected with the ball which abuts against the wavy surface 212.

[0053] Optionally, the outer side wall of the knob 21 is provided with a concave-convex structure, in particular, the outer side wall of the outer knob 215 is provided with a concave-convex structure, providing friction, facilitating the hand to contact and rotate. In this embodiment, the concave-convex structure of the outer side wall of the outer knob 215 is made by embossing process, which enhances the rotation texture and also improves the slip resistance of the product. Optionally, the material of the outer knob 215 is metal.

[0054] Optionally, the knob module further comprises a second fastener 8, the second fastener 8 passes through the rear cover 6 and is screwed with the internal threaded hole of the sleeving part 11.

[0055] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A knob module, characterized by, The utility model relates to a base (1) including the part (11) of setting and the part (12) of setting of being connected with the part (11) of setting reach in, rotate the assembly (2) including knob (21) and elastic positioning piece (22), the knob (21) rotation sets up in the part (11) of setting, the knob (21) is equipped with accommodating cavity (211), the part (12) of setting reaches in the accommodating cavity (211) inside, the part (12) of setting reaches in the end near the cavity bottom of accommodating cavity (211) is equipped with at least two installation groove (121), the cavity bottom of accommodating cavity (211) is equipped with wave surface (212), the elastic positioning piece (22) sets up in the installation groove (121), the one end of elastic positioning piece (22) is connected with the groove bottom of installation groove (121) or abuts against, the other end of elastic positioning piece (22) is connected with wave surface (212) or abuts against, main circuit board (3) is fixed in the part (12) of setting reaches in the end away from the cavity bottom of accommodating cavity (211), sensor assembly, including hall sensor (41) and magnetic ring (42), hall sensor (41) is fixed in main circuit board (3), and is worn in the part (12) of setting, magnetic ring (42) is fixed in the cavity bottom of accommodating cavity (211), when the knob (21) rotates, drives magnetic ring (42) rotation, makes the magnetic field that hall sensor (41) detects change, display assembly (5) is fixed in the base (1), and is located in the accommodating cavity (211) and is connected with main circuit board (3) electricity, back cover (6) is fixed in the base (1), can make the knob (21) abut at the base (1). The part (12) of setting reaches in is equipped with at least two positioning protrusions (122), and at least two positioning protrusions (122) are set up one by one with at least two installation groove (121), and the installation groove (121) extends from the end surface of the part (12) of setting reaches to the positioning protrusion (122), and the main circuit board (3) is equipped with the first positioning hole, and the positioning protrusion (122) is inserted with the first positioning hole. The cavity bottom of accommodating cavity (211) is equipped with the clamping groove (213), and the magnetic ring (42) is clamped into the clamping groove (213), wherein one of the magnetic ring (42) and the clamping groove (213) is provided with a first protrusion, and the other is provided with a first recess (421), the first protrusion and the first recess (421) are clamped, so that the knob (21) can drive the magnetic ring (42) to rotate when rotating. The display assembly (5) includes a screen seat (51), a first fastener (52), and a display screen (53). The first fastener (52) passes through the screen seat (51), the main circuit board (3), and is fixedly connected with the part (12) of setting reaches in sequence. The display screen (53) is detachably connected with the screen seat (51). ​ ​ ​ 2. The knob module according to claim 1, characterized in that ​ 3. The knob module of claim 1, wherein, ​ 4. The knob module of claim 1, wherein, ​ 5. The knob module of claim 4, wherein, The display assembly (5) further comprises a glass cover (54) covering the bezel (51), and the bottom surface of the glass cover (54) is sealingly connected to the top of the bezel (51) by sealing glue; the side wall of the main circuit board (3) is sealingly connected to the inner side wall of the bezel (51) by sealing glue.

6. The knob module of claim 4, wherein, The display assembly (5) further comprises a light guide ring (55) and an LED lamp film (56), and the bezel (51) is provided with a clamping groove (511), an annular groove (512) and a stepped groove (513); the display screen (53) is clamped with the clamping groove (511); the light guide ring (55) is clamped with the annular groove (512); the LED lamp film (56) is clamped with the stepped groove (513) and covers the light guide ring (55); and the top surface of the LED lamp film (56) is flush with the top surface of the bezel (51).

7. The knob module of claim 1, wherein, The knob (21) comprises a sleeve knob (214) and an outer knob (215), the sleeve knob (214) is rotationally sleeved on the sleeving part (11), the outer knob (215) is sleeved on the sleeve knob (214), one of the sleeve knob (214) and the outer knob (215) is provided with a second protrusion (2151), and the other is provided with a second groove (2141); the second protrusion (2151) is clamped with the second groove (2141), so that the sleeve knob (214) can be rotated when the outer knob (215) is rotated.

8. The knob module of claim 1, wherein, The elastic positioning member (22) comprises an elastic member (221) and a positioning column (222), the positioning column (222) is slidingly connected with the mounting groove (121), one end of the positioning column (222) is provided with a guide groove, one end of the elastic member (221) abuts against the groove bottom of the mounting groove (121), the other end of the elastic member (221) extends into the guide groove and abuts against the groove bottom of the guide groove, and the other end of the positioning column (222) is provided with a spherical part which abuts against the wavy surface (212).

9. The knob module of claim 1, wherein, The knob module further comprises a wire harness (7) which passes through the back cover (6) and the base (1) and is connected with the main circuit board (3).

10. The knob module of claim 1, wherein, The outer side wall of the knob (21) is provided with a concave-convex structure.

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