CN115171740A - Record player capable of automatically adjusting rotating speed - Google Patents

Abstract

The invention provides a record player capable of automatically adjusting the rotational speed, belonging to the technical field of record players. The invention includes a phono bracket and a rotating tray. The phono bracket is provided with a driving device, a phono head assembly, a platter shaft and an MCU control main board. It is electrically connected to the drive device and the phono head assembly. There is also a real-time speed detection device between the phono bracket and the rotating tray, including a speed measuring disc and a photoelectric sensor. The photoelectric sensor is fixed on the upper surface of the phono bracket, and the speed measuring disc is fixed on the rotating tray On the lower surface, the speed measuring plate and the photoelectric sensor are adapted to each other, and the photoelectric sensor is electrically connected to the MCU control board. The beneficial effects of the invention are as follows: no manual adjustment is required, the rotational speed control accuracy is high, the sound quality is not easily changed, the product quality of the record player is greatly improved, and the production cost is obviously reduced.

Description

A record player that can automatically adjust the rotational speed

technical field

The invention relates to the technical field of record players, in particular to a record player capable of automatically adjusting the rotational speed.

Background technique

A compact turntable (English: LongPlayingrecord, LP for short) is a record made of vinyl (such as polyvinyl chloride) material at _{33 1/3} ^rpm or 45 rpm or 78 rpm, generally 12 inches in diameter, 10 inches in diameter or 7 inches. Generally, LPs are recorded in analog. For LPs, a relatively soft material is first used to form a master disc, and then aluminum metal is poured on it to make a master plate for pressing. Using mastering, record producers can repeatedly press half-melted blank hard discs into music records. In addition to the standard black material, special records are also stamped on PVC in various colors (red, yellow, green, blue, white, multi-colored, etc.), or printed cardboard sandwiched between two sides on the "picturedisc". Records of all kinds of novel shapes are also constantly appearing. According to the needs of the quality of recorded music, there are generally _{33 1/3} ^rpm , 45 rpm and 78 rpm turntables on the market. These three rotational speed turntables require a record player to pick up the music on the track. Signal, the weak mechanical vibration signal is converted into an electrical signal in a tracking way, and after amplification, the speaker is pushed to convert it into music for people to enjoy.

However, when playing records of different speeds, the speed of the record player must reach the speed specified by the record, so that the music played can reach the standard sound, and the sound will not be changed due to the deviation of the speed. In the design and manufacture of current record player manufacturers, the speed of the motor is adjusted by manually adjusting the variable resistance that controls the voltage of the motor, and the third-speed speed is achieved by switching the motor to different gear voltages through a mechanical switch. The speed of each gear of the motor depends on the voltage supplied to that gear. Due to the error of the variable resistor, the power supply of the motor will also change with the fluctuation of the external power supply and the fluctuation of the internal audio load, so the speed of the motor will change with the fluctuation of the internal audio load. deviates, thereby shifting the tone of the picked-up sound. The traditional design and production are also very troublesome, requiring skilled workers to debug, and when the manual debugging is inaccurate, the played music is not a standard sound. This is time-consuming and labor-intensive, and the quality cannot be guaranteed.

SUMMARY OF THE INVENTION

In order to solve the problems in the prior art, the present invention provides a record player that can automatically adjust the rotation speed. By setting a real-time rotation speed detection device in the record player, the rotation speed of the rotating tray can be monitored in real time and fed back to the MCU control motherboard, and then the rotating tray can be automatically adjusted. The rotating speed of the recorder is maintained at 33 ¹ / ₃ rpm or 45 rpm or 78 rpm, no need to manually adjust the speed, the speed control is highly accurate, the sound quality is not easy to change, and the playback stability of the record player is greatly improved. The production cost is reduced, and the problems of unstable manual debugging quality of the record player, high production cost, and easily affected rotation speed in the traditional technology are solved.

The present invention provides a record player capable of automatically adjusting the rotational speed, comprising a record player bracket and a rotating tray, wherein the record player bracket is provided with a driving device, a cartridge assembly, a turntable shaft and an MCU control main board, and the rotating tray is detachably sleeved on the On the turntable shaft, the turntable shaft can be clamped to install a LP, the drive device is movably connected with the rotating tray, the MCU control main board is electrically connected with the drive device and the cartridge assembly, respectively, There is also a real-time detection device for rotational speed between the record player bracket and the rotating tray. The rotational speed real-time detection device includes a speed measurement disc and a photoelectric sensor. The photoelectric sensor is fixedly arranged on the upper surface of the record player bracket. It is fixedly arranged on the lower surface of the rotating tray, the speed measuring plate and the photoelectric sensor are adapted to each other, the photoelectric sensor is electrically connected with the MCU control main board, and the real-time rotating speed detection device can monitor the rotating tray in real time. The rotating speed of the rotating tray is fed back to the MCU control main board, and the MCU control main board can automatically regulate the driving device and then automatically adjust the rotating speed of the rotating tray to keep at _{33 1/3} ^rpm or 45 rpm or 78 rpm. point.

The present invention is further improved. The bottom surface of the speed measuring plate is provided with a plurality of light-absorbing black grids and a plurality of reflective white grids, and the light-absorbing black grids and the reflective white grids are alternately and uniformly distributed on the bottom surface of the speed measuring plate. For one week, the photoelectric sensor is an emission and absorption integrated photoelectric sensor.

The present invention makes a further improvement, the center of the rotating tray is provided with a disc support assembly, and the upper surface of the disc support assembly can be higher than the upper surface of the rotating tray and the LP can be clamped.

The present invention is further improved. The disc support assembly includes an adapter groove and a disc adapter, the disc adapter is movably clamped in the adapter groove, and the inner side wall of the adapter groove is provided with a symmetrical limiting boss. The record adapter is provided with a corresponding limit groove. When the limit groove is aligned with the limit boss, the upper surface of the record adapter is not higher than the upper surface of the rotating tray. When the limiting groove is staggered from the limiting boss and the upper surface of the disc adapter is higher than the upper surface of the rotating tray, the upper surface of the disc adapter can be clamped to set a LP.

The present invention is further improved. The other side of the connection between the phono bracket and the cartridge assembly is provided with an automatic return arm device, and the automatic return arm device includes a return arm motor, a return arm gear, a return hook and a return arm photoelectric The sensor assembly, the return arm motor and the return arm photoelectric sensor assembly are electrically connected to the MCU control board, the return arm motor is meshed with the return arm gear, and the return arm gear is connected to the return arm The hook is clamped, the return hook is clamped with the cartridge assembly, and the MCU control board can control the return arm motor to drive the return arm gear to drive the return hook and then turn the cartridge assembly. Return to the initial resting position.

The present invention is further improved, the return arm gear is provided with a fixedly connected helix, the return arm gear is clamped with the return hook through the helix, and the bottom of the return arm gear is provided with a fixedly connected stroke an end shielding piece, the return arm photoelectric sensor assembly includes a return arm emitting photoelectric sensor and a return arm receiving photoelectric sensor, and the travel end shielding piece can move between the return arm emitting photoelectric sensor and the return arm receiving photoelectric sensor .

A further improvement of the present invention is that the driving device includes a driving motor and a synchronous conveyor belt, the driving motor is fixedly connected to the phono bracket, and the driving motor is movably connected to the rotating tray through the synchronous conveyor belt.

A further improvement of the present invention is that the side wall of the rotating tray is provided with an annular groove, and the synchronous conveyor belt and the rotating tray are movably connected in the annular groove.

The present invention makes a further improvement, the phono head assembly includes a phono base, a phono and a phono, the phono base is fixedly connected to the phono bracket, the phono base is movably connected to the phono, the The phonograph is movably connected with the phono head, and the phono head can be attached to the LP that is clamped and arranged on the turntable shaft, and the phono-stick seat is electrically connected with the MCU control main board.

As a further improvement of the present invention, the record player bracket is further provided with an anti-vibration glue layer, and the shock-proof glue layer is arranged between the record player bracket and the rotating tray.

Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a record player capable of automatically adjusting the rotational speed, and by setting the rotational speed real-time detection device in the record player, the rotational speed of the rotating tray can be monitored in real time and fed back to the MCU control main board, The MCU control board can automatically adjust the output power of the drive device and automatically adjust the rotation speed of the rotating tray to keep at _{33 1/3} ^rpm or 45 rpm or 78 rpm, no need to manually adjust the speed, and the speed control is highly accurate , the sound quality is not easy to change the tone, which greatly improves the playback stability of the record player, while reducing the production cost, and solves the problem of unstable manual debugging quality, high production cost, and easily affected rotation speed in the traditional technology. Wherein, by arranging a turntable shaft and a record support assembly in the record player, the turntable shaft can be clamped and installed with an LP with an inner hole diameter of 7.3mm, and the upper surface of the record adapter can be installed with an LP with an inner hole diameter of 38.2mm. , simple structure and convenient operation, it can realize that a record player can play records with different inner hole diameters; by setting up an automatic return arm device in the record player, when the MCU control main board receives the feedback end signal from the photoelectric sensor assembly of the return arm and the phono head assembly After the feedback end signal for a certain period of time, the MCU control board can precisely control the return arm motor to drive the return arm gear to drive the return hook and then turn the cartridge assembly back to the initial resting position. The structure is simple, no manual operation is required, and it is fully automated, which improves the record player. playback quality.

Description of drawings

In order to illustrate the solutions in the present application or the prior art more clearly, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description belong to the present application. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is an exploded view of the structure of the record player capable of automatically adjusting the rotational speed of the present invention;

Fig. 2 is the structural principle diagram of the disc support assembly of the present invention;

FIG. 3 is a schematic structural diagram of the automatic arm return device of the present invention.

In the figure, 1-phono stand, 11-drive device, 111-drive motor, 112-synchronized conveyor belt, 12-phono head assembly, 121-phono seat, 122-phonic stick, 123-phonic head, 13-phonic shaft, 14-MCU control board, 15-Shockproof glue layer, 2-Rotating tray, 21-LP, 22-Disc support assembly, 221-Adapter groove, 222-Disc adapter, 223-Limit boss, 224-Limit Position groove, 3-speed real-time detection device, 31-speed measuring plate, 32-photoelectric sensor, 4-automatic arm device, 41-arm motor, 42-arm gear, 421-spiral line, 422-stroke end shield Sheet, 43-return hook, 44-return arm photoelectric sensor assembly, 441-return arm transmitting photoelectric sensor, 442-return arm receiving photoelectric sensor.

Detailed ways

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of this application; terms used herein in the specification of the application are for the purpose of describing particular embodiments only , is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings.

As shown in Figures 1-3, the present invention provides a record player capable of automatically adjusting the rotational speed, including a record player bracket 1 and a rotating tray 2. The record player bracket 1 is provided with a drive device 11, a cartridge assembly 12, a turntable shaft 13 and an MCU control The main board 14 and the rotary tray 2 are detachably sleeved on the turntable shaft 13, the turntable shaft 13 can be clamped to set the LP 21, the driving device 11 is movably connected with the rotary tray 2, and the MCU controls the main board 14 to the driving device 11 and the phono head respectively. The component 12 is electrically connected, and a real-time rotational speed detection device 3 is also provided between the phono bracket 1 and the rotating tray 2, and the real-time rotational speed detection device 3 includes a speed measuring disc 31 and a photoelectric sensor 32, and the photoelectric sensor 32 is fixedly arranged on the upper surface of the phono bracket 1, The speed measuring plate 31 is fixedly arranged on the lower surface of the rotating tray 2. The speed measuring plate 31 and the photoelectric sensor 32 are adapted to each other. The photoelectric sensor 32 is electrically connected with the MCU control main board 14. The bottom surface of the speed measuring plate 31 is provided with a plurality of light-absorbing black grids and a plurality of Reflective white grids, light-absorbing black grids and reflective white grids are alternately and evenly distributed around the bottom surface of the speed measuring disc 31 , and the photoelectric sensor 32 is an integrated photoelectric sensor of emission and absorption.

The photoelectric sensor 32 used in this embodiment is a two-in-one integrated photoelectric sensor for light emission and reception, which has a simple structure, stable quality and low cost. The light signal emitted by the photoelectric sensor 32 will reach the light-absorbing black grid on the bottom surface of the speed measuring plate 31. with reflective white grid. When the light signal is irradiated on the reflective white grid, almost all the light signal will be reflected back, and the light signal received by the photoelectric sensor 32 is very strong; when the light signal is irradiated on the light-absorbing black grid, almost no light signal will be reflected back, The optical signal received by the photoelectric sensor 32 is extremely weak; then the photoelectric sensor 32 converts high and low voltages to form a pulse signal, which is fed back to the MCU control main board 14, and the MCU control main board 14 can measure the actual rotation speed of the rotating tray 2 according to this signal, Then, the power supply voltage of the drive motor 111 is automatically adjusted, that is, the output power of the drive motor 111 is adjusted to automatically adjust the rotation speed of the rotating tray 2 to keep at _{33 1/3} ^rpm or 45 rpm or 78 rpm, so as to ensure that the The sound picked up above is played accurately without transposition.

As shown in FIG. 2 , a disc support assembly 22 is provided at the center of the rotary tray 2, and the upper surface of the disc support assembly 22 can be higher than the upper surface of the rotary tray 2 and is provided with an LP 21 in a snap connection. The disc support assembly 22 includes an adapter recess. The groove 221 and the record adapter 222, the record adapter 222 is movably snapped into the adapter groove 221, the inner wall of the adapter groove 221 is provided with a symmetrical limit boss 223, and the record adapter 222 is provided with a corresponding limit groove 224. When the limit groove 224 is aligned with the limit boss 223, the upper surface of the record adapter 222 is not higher than the upper surface of the rotating tray 2. The upper surface of 222 is higher than the upper surface of the rotating tray 2, and the upper surface of the record adapter 222 can be snapped to set the LP 21; The diameter of the upper surface is greater than 38.2mm, and the record adapter is provided with a grab hole for rotational movement. The turntable shaft 13 and the record adapter 222 are used in this embodiment. The turntable shaft 13 can be snapped and installed with an LP with an inner hole diameter of 7.3 mm, and the upper surface of the record adapter 222 can be fitted with a LP with an inner hole diameter of 38.2 mm. The patterned record has the advantages of simple structure, convenient operation, stable quality and low cost, and can realize a record player to play records of different inner hole diameters.

As shown in FIG. 3 , the other side of the connection between the phono bracket 1 and the cartridge assembly 12 is provided with an automatic return arm device 4 , and the automatic return arm device 4 includes a return arm motor 41 , a return arm gear 42 , a return hook 43 and a return arm The photoelectric sensor assembly 44, the return arm motor 41, and the return arm photoelectric sensor assembly 44 are electrically connected to the MCU control board 14, the return arm motor 41 is meshed with the return arm gear 42, and the return arm gear 42 is snapped with the return hook 43, and the return arm The position hook 43 is clamped with the phono head assembly 12, the return arm gear 42 is provided with a fixedly connected helix 421, the return arm gear 42 is clamped with the return hook 43 through the helix 421, and the bottom of the return arm gear 42 is provided with a fixed connection. The travel end shielding piece 422, the return arm photoelectric sensor assembly 44 includes the return arm transmitting photoelectric sensor 441 and the return arm receiving photoelectric sensor 442, the travel end shielding piece 422 can move to between the return arm transmitting photoelectric sensor 441 and the return arm receiving photoelectric sensor 442 , thereby blocking the reception of light, outputting a low-level signal, and stopping the continuous operation of the avoidance motor.

In this embodiment, when the record player is playing a record, the cartridge assembly will drive the snap-connected return hook to move, which in turn drives the return arm gear to rotate, and the stroke end shielding piece moves with the rotation of the return arm gear. When the arm emitting photoelectric sensor and the return arm receiving photoelectric sensor block the light signal emitted by the return arm transmitting photoelectric sensor, when the return arm receiving photoelectric sensor cannot receive the light signal, it is preliminarily determined that the record has run to the standard record stop point (close to the stop point of the standard record). The innermost circle of the record track) and feed it back to the MCU control board. At this time, the work of the record player cannot be stopped immediately. To stop the record player from working, the return arm cartridge assembly needs to meet another condition at the same time. When the MCU control board detects that the record player has no sound 10 seconds after (the audio track of the album is no longer available) (this time point can be set by yourself), the MCU control board determines that the album has been played. At this time, the MCU control board controls the return arm motor to drive the return arm gear to drive the return hook Then move the cartridge assembly back to the initial resting position, and the record player stops working, so that the record with the fullness of the track will not lose the sound of the last segment, and the record with a slightly less fullness of the track will not be idle for a long time. And they are all automatically controlled, and the turntable does not need to be debugged at the stop positioning point, which not only improves the playback quality of the record, but also improves the production efficiency. Moreover, the automatic arm return device can be disassembled. When the automatic arm return function is required, the automatic arm return device is installed, and vice versa.

As shown in FIG. 1 , the driving device 11 includes a driving motor 111 and a synchronous conveyor belt 112 . The driving motor 111 is fixedly connected to the phonograph bracket 1 , and the driving motor 111 is movably connected to the rotating tray 2 through the synchronous conveyor belt 112 . The side wall of the rotating tray 2 is provided with a ring The synchronous conveyor belt 112 and the rotating tray 2 are movably connected in the annular groove. In this embodiment, the annular groove is used to enhance the frictional force between the synchronous conveyor belt 112 and the rotating tray 2 to improve the stability of the record player.

As shown in FIG. 1 , the phono head assembly 12 includes a phono base 121 , a phono 122 and a phono 123 . The phono base 121 is fixedly connected to the phono bracket 1 , the phono base 121 is movably connected to the phono 122 , and the phono 122 is connected to the phono bracket 1 . The phono head 123 is movably connected, and the phono head 123 can be attached to the LP that is clamped and arranged on the turntable shaft. In this embodiment, one end of the phonograph 122 is movably connected with the phonograph base 121, and the other end can rotate with this contact point as the axis. The mechanical vibration signal is collected and converted into a voltage signal, and then sent to the MCU control main board 14 through the music bar seat 121 and the music bar 122, and the MCU control main board 14 amplifies it and pushes the speaker to convert it into music.

As shown in FIG. 1 , the phono stand 1 is further provided with an anti-vibration adhesive layer 15 , and the anti-vibration adhesive layer 15 is arranged between the phono stand 1 and the rotating tray 2 . In this embodiment, the anti-vibration adhesive layer 15 is used to slow down the up-and-down vibration of the rotating tray 2 during the rotation process, so as to improve the stability of the record player.

As can be seen from the above, the present invention provides a record player that can automatically adjust the rotational speed. By setting the rotational speed real-time detection device in the record player, the rotational speed of the rotating tray can be monitored in real time and fed back to the MCU control main board, and the MCU control main board can automatically regulate the output of the drive device. The power is then automatically adjusted to keep the rotating speed of the rotating tray at _{33 1/3} ^rpm or 45 rpm or 78 rpm, no need to manually adjust the speed, the speed control is highly accurate, the sound quality is not easy to change, and the record player is greatly improved. The playback stability is improved, and the production cost is reduced at the same time, which solves the problems of unstable manual debugging quality of the record player, high production cost, and easily affected rotation speed in the traditional technology. Wherein, by arranging a turntable shaft and a record support assembly in the record player, the turntable shaft can be clamped and installed with an LP with an inner hole diameter of 7.3mm, and the upper surface of the record adapter can be installed with an LP with an inner hole diameter of 38.2mm. , simple structure and convenient operation, can solve the problem that a record player cannot play records with different inner hole diameters; by setting up an automatic return arm device in the record player, when the MCU control main board receives the return arm photoelectric sensor component feedback end point signal and record After the end signal feedback from the head assembly for a certain period of time, the MCU control board can precisely control the return arm motor to drive the return arm gear to drive the return hook and then turn the cartridge assembly back to the initial resting position. improve the playback quality of the record player.

The specific embodiments described above are the preferred embodiments of the present invention, and are not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to the specific embodiments. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims (10)

1. A gramophone capable of automatically adjusting rotating speed is characterized in that: including record player support and rotatory tray, record player support is equipped with drive arrangement, record player subassembly, record player axle and MCU control mainboard, rotatory tray can dismantle cup joint in record player epaxial, record player axle can the joint set up the microgroove record, drive arrangement with rotatory tray swing joint, MCU control mainboard respectively with drive arrangement record player subassembly electric connection, record player support with still be equipped with rotational speed real-time detection device between the rotatory tray, rotational speed real-time detection device is including testing the speed dish and photoelectric sensor, photoelectric sensor fixed set up in record player support upper surface, the dish that tests the speed is fixed set up in rotatory tray lower surface, test the speed dish with photoelectric sensor adaptation each other, photoelectric sensor with MCU control mainboard electric connection, rotational speed real-time detection device can real-time supervision the rotational speed of rotatory tray and feed back to MCU control mainboard, MCU control mainboard can regulate and control automatically drive arrangement and then automatic adjustment the rotational speed of rotatory tray keeps at 331/3 minute or 45 minutes/minute or 78 minutes.

2. The record player capable of automatically adjusting a rotational speed as claimed in claim 1, wherein: the bottom surface of the speed measuring disc is provided with a plurality of light absorption black grids and a plurality of light reflection white grids, the light absorption black grids and the light reflection white grids are alternately and uniformly distributed on the periphery of the bottom surface of the speed measuring disc, and the photoelectric sensor is an emission and absorption integrated photoelectric sensor.

3. A record player capable of automatically adjusting rotational speed as claimed in claim 2, wherein: the center of the rotating tray is provided with a record supporting assembly, and the upper surface of the record supporting assembly can be higher than the upper surface of the rotating tray and is clamped with a microgroove record.

4. A record player capable of automatically adjusting rotational speed as claimed in claim 3, wherein: record support assembly includes adapter recess and record adapter, record adapter activity joint in the adapter recess, adapter recess inside wall is equipped with the spacing boss of symmetry, record adapter is equipped with the spacing recess that corresponds, works as spacing recess is aimed at during spacing boss joint, record adapter's upper surface is not higher than the upper surface of rotatory tray works as spacing recess staggers during spacing boss joint, record adapter's upper surface exceeds the upper surface of rotatory tray, record adapter's upper surface can the joint set up the microgroove record.

5. The record player capable of automatically adjusting a rotational speed of the disc player as claimed in claim 4, wherein: the gramophone support with the junction another side of gramophone subassembly is equipped with the automatic arm device that returns, the automatic arm device that returns includes back the arm motor, returns arm gear, return hook and returns arm photoelectric sensor subassembly, return the arm motor return arm photoelectric sensor subassembly with MCU control mainboard electric connection, return the arm motor with it connects to return arm gear engagement, return the arm gear with return hook joint, the return hook with gramophone subassembly joint, MCU control mainboard can control it drives to return arm motor return the arm gear drive the return arm gear advances and stirs the initial quiescent position is got back to the gramophone subassembly.

6. The record player capable of automatically adjusting a rotational speed of the disc player as claimed in claim 5, wherein: the return arm gear is equipped with fixed connection's helix, the return arm gear passes through the helix with return hook joint, return arm gear bottom is equipped with fixed connection's stroke terminal shielding piece, return arm photoelectric sensor subassembly includes return arm and transmits photoelectric sensor and return arm and receive photoelectric sensor, stroke terminal shielding piece can move extremely return arm and transmit photoelectric sensor with return between the photoelectric sensor.

7. A record player capable of automatically adjusting the rotational speed according to any one of claims 1 to 6, wherein: the drive device comprises a drive motor and a synchronous conveyor belt, the drive motor is fixedly connected with the gramophone support, and the drive motor is movably connected with the rotary tray through the synchronous conveyor belt.

8. The record player capable of automatically adjusting a rotational speed of the disc player as claimed in claim 7, wherein: the side wall of the rotary tray is provided with an annular groove, and the synchronous conveyor belt and the rotary tray are movably connected in the annular groove.

9. The record player of claim 8, wherein the record player is capable of automatically adjusting a rotational speed of the record player by: the record head subassembly includes record pole seat, record pole and record head, record pole seat with record player support fixed connection, record pole seat with record pole swing joint, record pole with record head swing joint, the record head can with the joint set up in the microgroove record of record axle pastes and connects, record pole seat with MCU control mainboard electric connection.

10. The record player of claim 9, wherein the record player is capable of automatically adjusting a rotational speed of the record player by: the gramophone support is further provided with a shockproof adhesive layer, and the shockproof adhesive layer is arranged between the gramophone support and the rotary tray.

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