CN221861270U - Scraper drive - Google Patents

Abstract

A scraper drive device is installed on an audio player and includes a base mechanism, a shaft cylinder, a turntable module, a bearing module and a scraper module. The base mechanism includes a base unit arranged on the audio player and a mounting seat assembled on the base unit and for the shaft cylinder to pass through. The turntable module includes a first rotating shaft sleeved on the shaft cylinder, a motor surrounding the first rotating shaft, and a turntable driven by the motor. The bearing module is connected between the first rotating shaft and the mounting seat. The scraper module is sleeved on the shaft cylinder. The scraper module can be switched between a linked state and a non-linked state. In the linked state, the scraper module is linked with the turntable, and in the non-linked state, the scraper module can rotate independently. With the above design, the turntable module can rotate stably and is not easy to shake, and has relatively good durability, which helps to increase the service life of the device.

Description

Scraper drive

Technical Field

The utility model relates to a driving device, in particular to a scraper driving device.

Background Art

Generally speaking, in order to create a specific atmosphere in a specific occasion, for example, to create a lively atmosphere at a party, DJs will push the vinyl record on the record player with their hands to control the rotation or direction of the record to adjust the playing speed or repeat the music clip; in addition, they can also adjust the volume to produce special music effects and create a lively atmosphere.

As time goes by, one of the mainstream ways to store music is to store music as an audio file in a digital signal format; users can use an audio player to read and directly play the audio file stored in it, or use the audio player to read the audio file connected to another device (such as a mobile phone or hard disk) to play music. Therefore, in order to enable the DJ to simulate the operating feeling of pushing a vinyl record while controlling the audio player, a simulated turntable can be set on the current audio player.

When the DJ brushes the analog turntable to the rhythm of the music, the rotation state of the analog turntable will be converted into an electrical signal and transmitted to the main body of the audio player to control the playback of the corresponding special music effect, thereby simulating the brushing of the vinyl record and effectively boosting the atmosphere of the scene. Therefore, developing an easy-to-operate and durable driving device that can simulate the feel of brushing a vinyl record is one of the goals of continuous research by people in the relevant technical field.

Utility Model Content

The utility model aims to provide a scraper drive device which can overcome at least one disadvantage of the prior art.

The scraper drive device of the utility model is suitable for being installed on an audio player. The scraper drive device comprises a base mechanism, a hollow shaft cylinder, a turntable module, a bearing module, and a scraper module.

The base mechanism comprises a base unit suitable for being arranged on the audio player, and a mounting base fixedly assembled on the base unit.

The shaft tube is penetrated through the mounting seat.

The turntable module comprises a first rotating shaft rotatably sleeved on the bottom end of the shaft tube, a motor surrounding the first rotating shaft, and a turntable fixedly installed on the first rotating shaft and the motor and driven by the motor.

The bearing module is connected between the first rotating shaft of the turntable module and the mounting seat.

The scraper module is rotatably mounted on the top end of the shaft tube. The scraper module can be transformed between a linkage state and a non-linkage state relative to the turntable module. In the linkage state, the scraper module is linked with the turntable, and in the non-linkage state, the scraper module can rotate independently relative to the turntable.

The scraper drive device of the utility model comprises a first ball bearing and a second ball bearing which are respectively sleeved on the first rotating shaft and axially spaced from each other.

The scraper drive device described in the utility model is characterized in that the first rotating shaft of the turntable module is radially spaced and sleeved on the shaft tube, and the mounting seat has a seat ring surface radially spaced and surrounding the first rotating shaft, a first connecting surface connected to the top end of the seat ring surface, and a second connecting surface connected to the bottom end of the seat ring surface, the first connecting surface is connected to the first ball bearing, the second connecting surface is connected to the second ball bearing, the diameter width of the seat ring surface is smaller than the outer diameter of the first ball bearing, and the diameter width of the seat ring surface is smaller than the outer diameter of the second ball bearing.

The scraper drive device described in the utility model comprises a motor including a stator mounted on the base mechanism, and a rotor cover which surrounds the stator at intervals and is fixedly mounted on the turntable. The stator can be driven by electricity to rotate the rotor cover, and the turntable is coaxially fixedly mounted on the first rotating shaft, so that when the turntable is driven by the stator, the first rotating shaft is driven to rotate synchronously.

The scraper drive device described in the utility model comprises a first rotating shaft having a head portion rotatably sleeved on the shaft tube, and an extension portion extending downward from the head portion and sleeved on the shaft tube, wherein the outer diameter of the extension portion is smaller than the outer diameter of the head portion, and the first ball bearing and the second ball bearing are sleeved on the outer periphery of the extension portion.

The scraper drive device described in the utility model also includes a turntable sensing module, which includes a first shading plate located below the second ball bearing and linked to the first rotating shaft, and a first light sensing element of the base unit installed on the base mechanism, and the first light sensing element is used to detect the rotation information of the first shading plate.

The scraper drive device described in the utility model comprises a scraper module including a second rotating shaft rotatably mounted on the top end of the shaft tube, a scraper lower seat fixedly coupled to the second rotating shaft, and a scraper assembly removably magnetically attracted to the scraper lower seat, the turntable module also comprising a wear-resistant plate group sandwiched between the turntable and the scraper assembly, the wear-resistant plate group being used to enable the scraper assembly to rotate relative to the turntable.

The scraper drive device described in the utility model comprises a scraper lower seat having a lower seat body connected to the second rotating shaft, and a plurality of first magnetic parts arranged on the top side of the lower seat body, and the scraper assembly comprises a scraper body located above the scraper lower seat, and a plurality of second magnetic parts arranged on the scraper body and magnetically attracted to the first magnetic parts.

The scraper drive device described in the utility model also includes a display module, which includes a display screen fixedly arranged on the top of the shaft tube, and a transmission line group that is signal-connected to the display screen and passes through the shaft tube, and the transmission line group is used for signal connection to the audio player.

The scraper drive device of the utility model further comprises a scraper sensing module, which comprises a second light shielding sheet linked to the scraper lower seat, and a second light sensing element connected to the display module and used for detecting the rotation information of the second light shielding sheet.

The beneficial effect of the utility model is that by utilizing the design of the base mechanism, the turntable module, and the bearing module, the turntable module can be stably rotated and not easily shaken, has relatively good durability, and helps to increase the service life of the device.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

FIG1 is a perspective view illustrating an embodiment of the scratch disk drive device of the present invention applicable to an audio player;

Fig. 2 is a top view illustrating this embodiment;

FIG3 is an exploded perspective view illustrating this embodiment;

FIG4 is a perspective exploded view of the embodiment from another angle;

FIG5 is a cross-sectional view taken along line V-V in FIG2;

FIG6 is a cross-sectional view taken along line VI-VI in FIG5 , illustrating a turntable sensing module of the embodiment;

FIG7 is a cross-sectional view taken along line VII-VII in FIG2;

FIG8 is a cross-sectional view taken along line VIII-VIII in FIG5 , illustrating a scraper sensing module of the embodiment;

FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 2 .

DETAILED DESCRIPTION

The utility model is described in detail below with reference to the accompanying drawings and embodiments.

Referring to FIG. 1 , an embodiment of the scratch disk drive device 10 of the utility model is applicable to an audio player 90. The audio player 90 can read a music data and play the music. The music data is stored in the audio player 90, or in an external storage device (not shown) connected to the audio player 90 by signal, such as a handheld electronic device or a USB flash drive.

Referring to Figures 2 to 4, the scraper drive device 10 includes a base mechanism 1, a shaft tube 2 extending up and down along an axial direction A and fixedly penetrated through the base mechanism 1, a turntable module 3 mounted outside the shaft tube 2, a bearing module 4 connected between the turntable module 3 and the base mechanism 1, a scraper module 5 rotatably mounted on the top end of the shaft tube 2, a display module 6 located at the top end of the shaft tube 2, a turntable sensing module 7, and a scraper sensing module 8.

Referring to FIGS. 3 to 5 , the base mechanism 1 includes a base unit 11 that can be installed and disposed on the audio player 90, and a mounting base 12 that is fixedly assembled on the base unit 11. The base unit 11 includes a main body 111, and a circuit board 112 that is disposed on the main body 111 and is signal-connected to the audio player 90. It should be noted that the circuit board 112 can be integrated with a printed circuit board (not shown) of the audio player 90 according to actual application requirements, or can be signal-connected to each other using signal lines. The mounting base 12 penetrates the main body 111 and the circuit board 112, and has a seat ring surface 121 surrounding the shaft tube 2, a first connecting surface 122 connected to the top of the seat ring surface 121, and a second connecting surface 123 connected to the bottom of the seat ring surface 121. The seat ring surface 121 , the first connecting surface 122 , and the second connecting surface 123 jointly define a mounting hole 124 .

The shaft cylinder 2 is in the shape of a hollow cylinder and is inserted into the mounting hole 124 of the mounting seat 12. The shaft cylinder 2 is radially spaced from the mounting seat 12 and is locked to the bottom side of the seat body 111 by a hexagonal nut.

The turntable module 3 includes a first rotating shaft 31 rotatably mounted on the bottom end of the shaft tube 2, a motor 32 surrounding the first rotating shaft 31, a turntable 33 fixedly mounted on the first rotating shaft 31 and the motor 32 and driven by the motor 32, and a wear-resistant plate group 34.

The first rotating shaft 31 is radially spaced and sleeved on the shaft cylinder 2, and is penetrated through the mounting hole 124 of the mounting seat 12. The first rotating shaft 31 has a head 311 that is rotatably radially sleeved on the shaft cylinder 2, and an extension portion 312 that integrally extends downward from the head 311 along the axial direction A. The extension portion 312 is radially sleeved on the shaft cylinder 2, and radially surrounds the seat ring surface 121 of the mounting seat 12 and is radially spaced from the inside and outside, and the outer diameter of the extension portion 312 is smaller than the outer diameter of the head 311.

The motor 32 is used to be electrically connected to the audio player 90 (as shown in FIG. 1 ), and includes a stator 321 fixedly assembled to the base mechanism 1 and spaced around the outer circumference of the first rotating shaft 31, and a rotor outer cover 322 spaced around the outer circumference of the stator 321. The rotor outer cover 322 can be driven to rotate when the stator 321 is powered. In this embodiment, the stator 321 includes a coil assembly, and the rotor outer cover 322 includes a magnet assembly.

The rotating disk 33 is coaxially fixedly assembled on the top side of the first rotating shaft 31 and the rotor outer cover 322 by using a plurality of fixing members, so that when the rotating disk 33 is driven by the stator 321, it can drive the first rotating shaft 31 to rotate synchronously. The rotating disk 33 has an annular top surface 331 and a circular groove 332 that is recessed downward from the inner periphery of the top surface 331. The fixing member is, for example but not limited to, a bolt.

The wear-resistant sheet set 34 includes two wear-resistant pads 341 in an annular shape and stacked on the top surface 331 of the rotating disk 33. In this embodiment, the wear-resistant pads 341 are mainly made of mylar. It should be noted that the number of the wear-resistant pads 341 is not limited to two, and can also be three, four, etc.

The bearing module 4 is connected between the first rotating shaft 31 of the turntable module 3 and the mounting seat 12, and includes a first ball bearing 41 and a second ball bearing 42. The first ball bearing 41 and the second ball bearing 42 are radial bearings having an inner ring, an outer ring, and a plurality of balls located between the inner ring and the outer ring. The first ball bearing 41 is sleeved on the outer periphery of the extension portion 312 of the first rotating shaft 31 and connected to the first connecting surface 122. The second ball bearing 42 is located below the first ball bearing 41 at intervals along the axial direction A, and is sleeved on the outer periphery of the extension portion 312 of the first rotating shaft 31 and connected to the second connecting surface 123. Thus, the first ball bearing 41 and the second ball bearing 42 enable the first rotating shaft 31 to rotate relative to the mounting seat 12. The diameter width of the seat ring surface 121 is smaller than the outer diameter of the first ball bearing 41 , and the diameter width of the seat ring surface 121 is smaller than the outer diameter of the second ball bearing 42 , so that the first ball bearing 41 and the second ball bearing 42 can be spaced apart from each other.

The scraper module 5 is rotatably mounted on the shaft tube 2 and includes a second shaft 51 rotatably mounted on the top end of the shaft tube 2, a scraper lower seat 52 fixedly coupled to the second shaft 51, and a scraper assembly 53 detachably magnetically attracted to the scraper lower seat 52.

The second rotating shaft 51 is located above the first rotating shaft 31 at intervals. The scraper lower seat 52 has a lower seat body 521 fixedly coupled to the second rotating shaft 51, and a plurality of first magnetic members 522 mounted on the lower seat body 521. The lower seat body 521 has a seat bottom 523, two position limiting protrusions 524 protruding upward from the seat bottom 523, and a plurality of top connection posts 525 extending upward from the periphery of the seat bottom 523 at angular intervals. The first magnetic members 522 are respectively connected to the top sides of the top connection posts 525.

The scraper assembly 53 has a scraper body 531 located above the scraper lower seat 52, and a plurality of second magnetic members 532 disposed on the bottom side of the scraper body 531. The scraper body 531 has a transparent central area 533, and a surrounding disk area 534 extending radially outward from the central area 533. The second magnetic members 532 are attached to the bottom side of the surrounding disk area 534, and are magnetically attracted to the first magnetic members 522 respectively. The wear-resistant gasket 341 is sandwiched between the top surface 331 of the turntable 33 and the bottom side of the surrounding disk area 534, which helps the scraper assembly 53 to rotate relative to the turntable 33.

The rotary disc module 3 can be switched between a linkage state and a non-linkage state. In the linkage state, the scraper module 5 is linked with the rotary disc 33. In the non-linkage state, the scraper module 5 can rotate independently relative to the rotary disc 33. The following is a detailed description.

When the rotary disk 33 is driven by the motor 32 and the scraper module 5 is in the linkage state, the scraper module 5 can be driven by the rotary disk 33 to rotate synchronously by utilizing the friction between the scraper module 5, the wear-resistant sheet group 34 and the rotary disk 33. When the scraper assembly 53 is pushed forward or reversely relative to the rotation direction of the rotary disk 33 to overcome the friction, the scraper module 5 is driven to switch to the non-linked state and can rotate independently relative to the rotary disk 33, that is, the scraper module 5 does not rotate synchronously with the rotary disk 33, and the scraper module 5 can be, for example but not limited to, rotated at a reduced speed, stopped, or rotated in the reverse direction.

The display module 6 includes an assembly seat 61 fixedly disposed on the top of the shaft tube 2, a display screen 62 fixedly disposed on the assembly seat 61, a plastic sheet 63 placed above the display screen 62, and a transmission line set 64 connected to the display screen 62 and passing through the shaft tube 2 and protruding from the bottom of the seat body 111. The transmission line set 64 is used for signal connection to the audio player 90. The plastic sheet 63 has a window 631 corresponding to the position of the central area 533. The display screen 62 is located below the central area 533 and the window 631.

During implementation, the transmission line group 64 can be a row of cables that can be detachably plugged into the circuit board 112 or a control circuit board (not shown) of the audio player 90, and the signal is connected between the audio player 90 and the display screen 62 to receive the display signal and transmit it to the display screen 62, so that the display screen 62 can display corresponding information such as music tracks.

Referring to FIGS. 1 to 2 and 6 to 7, the turntable sensing module 7 is located in the seat body 111 and includes a first light shielding sheet 71 in the shape of a transparent disc and linked to the bottom end of the first rotating shaft 31, and a first light sensing element 72. The first light sensing element 72 is electrically connected to the circuit board 112 and is used to detect the rotation state of the first light shielding sheet 71. The first light shielding sheet 71 has a plurality of first scales 711 at angular intervals. The first light sensing element 72 is signal-connected to the audio player 90, and can sense the first scale 711 through which the rotation displacement passes when the first light shielding sheet 71 rotates through light sensing technology, thereby measuring the rotation information such as the rotation speed of the first light shielding sheet 71, and transmitting the rotation speed information back to the circuit board 112. In this embodiment, the first light sensor 72 can be a light blocking sensor that is blocked by the first scale 711, or a light reflecting sensor that senses the reflected light of the first scale 711. In addition, the first light sensor 72 can also be changed to a direct signal connection to the audio player 90.

Referring to FIGS. 1 to 2 and 8 to 9, the structure of the scraper sensing module 8 is similar to that of the rotary sensing module 7 shown in FIGS. 7 to 8, and is located in the lower seat body 521 of the scraper lower seat 52. The scraper sensing module 8 includes a second light shielding sheet 81 in the shape of a transparent disc and linked to the second rotating shaft 51, and a second light sensing element 82 installed on the assembly seat 61 of the display module 6. The second light shielding sheet 81 is sleeved on the limiting protrusion 524 of the lower seat body 521, and has a plurality of second scales 811 at angular intervals. In this way, the second light shielding sheet 81 can rotate synchronously with the scraper module 5. The second light sensing element 82 is used to detect the rotation state of the second light shielding sheet 81. In detail, the second light sensor 82 is connected to the circuit board 112 by signal, and can use light sensing technology to sense the second scale 811 through which the rotation displacement passes when the second light shielding sheet 81 is driven by the scraper lower seat 52 to rotate synchronously, and measure the rotation information such as the rotation speed of the second light shielding sheet 81, and transmit the rotation information back to the circuit board 112. In this embodiment, the function of the second light sensor 82 is the same as that of the first light sensor 72, so it will not be described in detail. In addition, the second light sensor 82 is also changed to be directly connected to the audio player 90 by signal.

Referring to Fig. 2, Fig. 3 and Fig. 5, when the scraper drive device 10 of the utility model is used, the motor 32 is powered on to operate, so that the rotor outer cover 322 rotates and drives the turntable 33 to rotate. By means of the friction provided by the wear-resistant pad 341, the turntable 33 drives the scraper assembly 53 to rotate synchronously. At this time, the scraper module 5 is in the linkage state. When the user (not shown) such as a DJ brushes the scraper assembly 53 by hand in the forward or reverse direction relative to the rotation direction of the turntable 33, the scraper assembly 53 is also driven and converted to a non-linked state of independent rotation without linkage with the turntable 33. At this time, the rotation speed of the scraper module 5 is different from that of the turntable 33. In particular, by means of the setting of the wear-resistant pad 341, the user can smoothly brush the scraper assembly 53 to drive the scraper assembly 53 to reduce the rotation speed, stop the rotation, or rotate in the opposite direction.

Therefore, the user can use the scraper assembly 53 as a simulated turntable, and when brushing the scraper assembly 53, a brushing feel similar to that of operating a conventional vinyl record is produced.

While the turntable 33 is driven by the motor 32, the turntable sensing module 7 senses the rotation information of the turntable 33, and the scraper sensing module 8 senses the rotation information of the scraper module 5, and transmits the rotation information to the central processing system (not shown) inside the audio player 90 through the circuit board 112, so that when the audio player 90 plays the audio file in digital format, it can generate corresponding special changing sound effects according to the rotation information of the turntable sensing module 7 and the rotation information of the scraper sensing module 8. Since the above-mentioned technology of converting the rotation information into the corresponding special changing sound effects is well known to those with ordinary knowledge in the relevant technical field, it will not be described in detail here.

Furthermore, since the first ball bearing 41 and the second ball bearing 42 of the bearing module 4 are arranged at intervals in the upper and lower directions along the axial direction A and are connected between the first rotating shaft 31 and the mounting seat 12, the first rotating shaft 31 can be more stably located in the axial direction A without shaking during the rotation process, and the rotational force can be evenly transmitted to the first shading film 71 located at the bottom end of the first rotating shaft 31, thereby enabling the first shading film 71 to stably rotate in the axial direction A without deviation.

In summary, the scraper drive device 10 of the utility model, through the structural design along the bearing module 4, enables the turntable module 3 and the turntable sensing module 7 to rotate stably, thereby improving the overall durability of the device and helping to increase the service life of the device. Furthermore, by utilizing the design of the shaft tube 2, when the transmission line group 64 is arranged, the predetermined inner diameter of the shaft tube 2 can be appropriately enlarged, so that the transmission line group 64 can be directly inserted into the audio player 90 through the shaft tube 2, and the assembly is time-saving and convenient. In addition, by utilizing the design of the first magnetic member 522 and the second magnetic member 532 that are magnetically attracted to each other, the scraper assembly 53 can be simply removed from the scraper lower seat 52 or adsorbed back, and disassembly and assembly are quite convenient. Therefore, the scraper drive device 10 of the utility model is indeed a novel and innovative design, so it can indeed achieve the purpose of this utility model.

The above are merely embodiments of the present invention and should not be used to limit the scope of the present invention. That is, any simple equivalent changes and modifications made according to the claims and description of the present invention still fall within the scope of the present invention.

Claims (10)

1. A scratch disc drive apparatus adapted for mounting to an audio player and comprising a base mechanism, characterized in that: the base mechanism comprises a base unit which is suitable for being arranged on the audio player, a mounting seat which is fixedly assembled on the base unit, a hollow shaft barrel, a rotary disc module, a bearing module and a scraping disc module, wherein the shaft barrel is arranged on the mounting seat in a penetrating mode, the rotary disc module comprises a first rotary shaft which is rotatably sleeved on the bottom end portion of the shaft barrel, a motor which surrounds the first rotary shaft, and a rotary disc which is fixedly arranged on the first rotary shaft and the motor and can be driven by the motor to rotate, the bearing module is connected between the first rotary shaft of the rotary disc module and the mounting seat, the scraping disc module is rotatably sleeved on the top end portion of the shaft barrel, the scraping disc module can be transformed between a linkage state and a non-linkage state relative to the rotary disc module, and the scraping disc module can be independently rotated relative to the rotary disc in the non-linkage state.

2. A wiper drive according to claim 1, wherein: the bearing module comprises a first ball bearing and a second ball bearing which are respectively sleeved on the first rotating shaft and are axially spaced from each other.

3. A wiper drive according to claim 2, wherein: the first rotating shaft of the rotating disc module is radially sleeved on the shaft barrel at intervals, the mounting seat is provided with a seat ring surface, a first connecting surface and a second connecting surface, the seat ring surface surrounds the first rotating shaft at intervals, the first connecting surface is connected with the first ball bearing, the second connecting surface is connected with the second ball bearing, the diameter width of the seat ring surface is smaller than the outer diameter of the first ball bearing, and the diameter width of the seat ring surface is smaller than the outer diameter of the second ball bearing.

4. A wiper drive according to claim 3, wherein: the motor comprises a stator and a rotor outer cover, wherein the stator is arranged on the base mechanism, the rotor outer cover surrounds the stator at intervals and is fixedly arranged on the rotary table, the stator can be powered on to drive the rotor outer cover to rotate, the rotary table is coaxially and fixedly arranged on the first rotating shaft, and the rotary table is used for driving the first rotating shaft to synchronously rotate when being driven by the stator.

5. A wiper drive according to claim 4, wherein: the first rotating shaft is provided with a head part capable of rotating and sleeved on the shaft barrel, and an extension part which extends downwards from the head part and is sleeved on the shaft barrel in a ring mode, the outer diameter of the extension part is smaller than that of the head part, and the first ball bearing and the second ball bearing are sleeved on the periphery of the extension part in a ring mode.

6. A wiper drive according to claim 2, wherein: the rotary table sensing module comprises a first shading sheet which is positioned below the second ball bearing and is combined with the first rotating shaft in a linkage manner, and a first light sensing piece which is arranged on the base unit of the base mechanism and is used for detecting the rotation information of the first shading sheet.

7. A wiper drive according to claim 3, wherein: the scraping disc module comprises a second rotating shaft which can be rotatably sleeved at the top end part of the shaft barrel, a scraping disc lower seat which is fixedly combined with the second rotating shaft, and a scraping disc assembly which can be removed from the earth and is magnetically sucked on the scraping disc lower seat, and the rotating disc module further comprises a wear-resisting sheet group which is clamped between the rotating disc and the scraping disc assembly and is used for enabling the scraping disc assembly to rotate relative to the rotating disc.

8. A wiper drive according to claim 7, wherein: the scraping plate lower seat is provided with a lower seat body connected with the second rotating shaft, a plurality of first magnetic pieces arranged on the top side of the lower seat body, a scraping plate assembly arranged above the scraping plate lower seat and a plurality of second magnetic pieces arranged on the scraping plate body and attracted with the first magnetic pieces by magnetism.

9. A wiper drive according to claim 7, wherein: the audio player also comprises a display module, wherein the display module comprises a display screen fixedly arranged at the top end of the shaft barrel and a transmission line group which is connected with the display screen through signals and penetrates through the shaft barrel, and the transmission line group is used for being connected with the audio player through signals.

10. A wiper drive according to claim 9, wherein: the scraping disc sensing module comprises a second shading sheet and a second light sensing piece, wherein the second shading sheet is combined with the scraping disc lower seat in a linkage mode, and the second light sensing piece is connected with the display module and used for detecting rotation information of the second shading sheet.