CN105534170A - Baby crib electric vibration device capable of simulating vibration of train and control method of baby crib electric vibration device - Google Patents

Abstract

The invention discloses an electric vibrating device for a baby bed for simulating train vibration, which comprises a brushless DC motor, two eccentric blocks, multiple sets of supporting springs, a motor drive circuit, a button input circuit, a start-stop button circuit, a display, an information memory and Digital signal processor with simple and reasonable structure, flexible configuration and convenient maintenance. The invention also discloses a method for controlling the vibration of the baby bed by using the electric vibration device for the simulated train vibration baby bed. After information, press the start button in the start-stop button circuit of the electric vibrating device, the brushless DC motor runs, and the digital signal processor finally controls the vibration of the crib to simulate the whole running process of the train from start to stop, so as to be able to Instead of manpower to help babies fall asleep, reduce the burden on parents of babies.

Description

An electric vibration device and control method for a baby bed that simulates train vibration

technical field

The invention relates to the technical field of cribs, in particular to an electric vibration control device and control method for a crib that simulates the vibration of a train.

Background technique

Cribs refer to beds for infants and young children. There are various styles, functions and prices are also very different. Safety and practicality are always the primary principles for choosing a crib. The bed structure of a traditional crib is similar to that of an ordinary adult bed, but the bottom of the crib is equipped with an arc-shaped rocker, which can be manually pushed to make the crib shake as a whole to make the baby fall asleep. For modern young people who are new parents , Such nursing methods are time-consuming and laborious. Moreover, the amplitude and strength of artificial shaking are not easy to control, and often cannot promote the baby's sleep, but instead produce a reverse interference effect, which makes people very distressed. With the advancement of science and technology, it has become a major trend for smart electric products to replace manpower, and it has also brought great convenience to human life. Therefore, some baby beds with automatic shaking functions have appeared on the market, such as CN204764553U. In the shaking crib, by setting an arc body and a guide rod for reciprocating movement, the main body can be shaken relative to the U-shaped bracket with the rotating shaft as the axis; The shaft is the center to drive the lever to rotate eccentrically, and the lever and the adapter cover cooperate to drive the bed board to reciprocate left and right, thereby realizing the rocking action of coaxing the baby to sleep. However, these intelligent cribs have problems such as complex structures and regular vibrations that cannot form combined vibrations of multiple vibration frequencies and amplitudes. Therefore, the cribs in the prior art still need to be improved and developed.

In life, when people sit on a train that is basically running smoothly, it is not difficult to find that the vibration of the moving train often makes people drowsy, and the vibration generated by the running of the train is just a kind of irregular vibration. It is related to the speed of the train, the state of the road surface (crossing curves, bridges, turnouts, uphill and downhill, plains, etc.), rail conditions (long track, short track, etc.), it is a composite of multiple frequencies with different amplitudes. Vibration, therefore, according to the vibration principle of the train in motion, it is of great significance to design an electric vibrating device for a crib that simulates train vibration and a method for controlling the vibration of the crib.

Contents of the invention

The object of the present invention is to provide an electric vibration device for a baby bed and a method for controlling the vibration of the baby bed, and use an intelligent electric product that can imitate the vibration of a train instead of manpower to coax the baby to sleep, thereby reducing the burden on the baby's parents.

In order to achieve the above object, the present invention provides an electric vibration device for a crib that simulates the vibration of a train, including a brushless DC motor, two eccentric blocks, two turntables, multiple sets of support springs, a motor drive circuit, a key input circuit, a start-stop Button circuit, display, information memory and digital signal processor; the brushless DC motor is horizontally fixed on the center of the bottom surface of the bed board of the baby crib, and the motor shaft is connected with a turntable before and after, and each turntable is fixed with One eccentric block; four sets of support springs in the multiple sets of support springs are respectively fixed between the four corners of the bed board of the crib and the base of the crib; the key input circuit and the start and stop key circuit respectively connected to the input of the digital signal processor, the input of the motor drive circuit and the input of the display are respectively connected to the output of the digital signal processor; the motor drive circuit drives the The brushless DC motor runs, and the start-stop button circuit controls the start and stop of the brushless DC motor; the digital signal processor is connected to the information memory; the output end of the motor drive circuit is connected to the brushless DC motor to Drive the brushless DC motor to run, the start and stop button circuit controls the start and stop of the brushless DC motor; the digital signal processor is connected to the information memory, and the button input circuit includes a button for manually inputting vibration information and a button for calling historical vibration information, the vibration frequency of the baby cot simulating train vibration is 0-8.8 Hz.

Further, the installation positions of the two eccentric blocks are the same; the multiple sets of support springs also include support springs installed at the front, back, left and right of the bed board of the crib and stretched or compressed along the plane direction of the bed board .

Further, the vibration information manually input on the keys of the key input circuit is the vibration frequency of the train, or the vibration information manually input on the keys of the key input circuit includes the speed of the train and the length of the rail.

Further, the manual input range of the vibration frequency of the train is 2Hz-8.8Hz.

Further, the manual input range of the running speed of the train is 90Km/h-400Km/h; the rail length of the train is 12.5m or 25m.

Further, the speed of the train and the length of the rails are converted into the train vibration frequency, and the conversion formula is: train vibration frequency Under the vibration frequency of the train, one revolution of the brushless DC motor is one vibration cycle.

The present invention also provides a method for controlling the vibration of the baby bed according to the above-mentioned electric vibration device of the baby bed, comprising:

(1) The user selects the manual input vibration information mode or continues to use the historical vibration information mode through the key of the key input circuit of the electric vibration device;

(2) In the manual input vibration information mode, after the user inputs the required vibration information through the keys of the key input circuit, he presses the start key in the start-stop key circuit of the electric vibration device; The digital signal processor of the device converts the vibration information into train vibration information, and controls the motor drive circuit of the electric vibration device to drive the operation of the brushless DC motor of the electric vibration device according to the train vibration information. The bed vibrates in a simulated train vibration mode, and the vibration frequency is 0-8.8 Hz; at the same time, the digital signal processor will write the vibration information input this time into the information memory of the electrodynamic vibration device;

(3) In the mode of continuing to use the historical vibration information, the user calls the historical vibration information in the information memory through the key of the key input circuit, presses the start key, and the digital signal processor will record the historical vibration information The information is converted into train vibration information, and the motor drive circuit is controlled according to the train vibration information to drive the operation of the brushless DC motor. The baby cot vibrates in a simulated train vibration mode, and the vibration frequency is 0-8.8 Hz.

Further, the vibration information input by the user and the historical vibration information invoked are both train vibration frequencies, and the digital signal processor converts the train vibration frequency into train vibration information; the vibration information input by the user and the historical vibration information invoked The vibration information is the speed of the train and the length of the rail, and the digital signal processor calculates the vibration frequency of the train according to the speed of the train and the length of the rail

Further, the vibration process of the crib according to the vibration mode of a running train includes: after the brushless DC motor starts to run, the vibration frequency of the crib will rise to the vibration input by the user in an S-shaped curve frequency or the historical vibration frequency of calling; after the user presses the stop button in the start-stop button circuit, the vibration frequency of the crib will drop with an S-shaped curve until the brushless DC motor stops.

Further, when the vibration frequency input by the user or the historical vibration frequency called is less than or equal to 80 Hz, the vibration frequency of the crib rises or falls in an S-curve with a time of 8 seconds; when the vibration frequency input by the user Or when the recalled historical vibration frequency is greater than 80 Hz, the vibration frequency of the crib rises or falls in an S-curve with a time of 10 s.

Further, the historical vibration information recalled by the user from the information memory through the key of the key input circuit is the vibration information stored when the electrodynamic vibration device was used last time.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

1. The baby crib electric vibration device provided by the present invention has simple and reasonable structure, flexible configuration and convenient maintenance. In the method of controlling the baby bed vibration through the baby bed electric vibration device, the brushless motor with eccentric block can be driven by a motor. The motor shaft of the DC motor rotates, and the quality of the eccentric block is unbalanced, which makes the turntable on the motor shaft rotate to generate centrifugal force, so that the brushless DC motor drives the bed board of the crib and the supporting spring to perform forced compound vibration. Digital signal processing is based on the train Research on the decomposition of irregular vibration during driving, adjust the speed of the brushless DC motor, so that the baby cot can imitate the vibration during the whole running process of the train from start to stop, and can quickly put the baby to sleep, thereby reducing the burden on the baby's parents;

2. In the method of controlling the vibration of the baby bed by the electric vibration device of the baby bed in the present invention, two kinds of control can be realized: manual input vibration information mode and historical vibration information mode through the cooperation of key input circuit, digital signal processor and information memory Mode, so that the user can adjust the vibration frequency of the crib according to the actual situation of the baby, so that the crib can not only coax the baby to sleep at a low vibration frequency, but also give a baby a wakeful baby at a high vibration frequency. The experience of riding a toy train.

Description of drawings

Fig. 1 is the schematic diagram of the front view structure of the electric vibrating device of the crib according to the specific embodiment of the present invention;

Fig. 2 is a top structural schematic diagram of the electric vibrating device for the crib shown in Fig. 1;

Fig. 3 is a schematic diagram of the turntable structure and the installation position of the eccentric block of the electric vibration device for the crib shown in Fig. 1;

Fig. 4 is the circuit principle diagram of the electric vibrating device of the crib shown in Fig. 1;

Fig. 5 is a flowchart of a method for controlling the vibration of a crib according to a specific embodiment of the present invention;

Fig. 6 is a schematic diagram of the crib vibration frequency rising and falling along the S-curve in the method for controlling the crib vibration shown in Fig. 5 .

detailed description

An electric vibration device for a baby bed and a method for controlling the vibration of the baby bed according to the present invention will be further described in detail below with reference to the drawings and embodiments.

Please refer to Fig. 1 to Fig. 4, the crib electric vibrating device provided by this embodiment is installed between the bed board 11 and the base 12 of the crib 10, and the crib electric vibrating device includes a brushless DC motor 21, two eccentric blocks 22. Two turntables 23, multiple sets of support springs 24, motor drive circuit 25, key input circuit 26, start and stop key circuit 27, display 28, information memory 29 and digital signal processor 20.

Wherein, the motor shaft 211 of the brushless DC motor 21 has a turntable 23 connected to the motor shaft 211 before and after, each turntable 23 is fixed with an eccentric block 22, and the installation positions of the two eccentric blocks 221, 222 are the same, that is, the eccentric block 221 The installation position on the turntable 231 is the same as that of the eccentric block 222 on the turntable 232. The brushless DC motor 21 is horizontally fixed on the center of the bottom surface of the bed board 11 of the crib 10; each of the four corners of the crib 10 has a set of supports The springs 24 are respectively fixed between the bed corners of the bed board 11 and the base 12 of the crib 10. After the brushless DC motor 21 works, its motor shaft 211 rotates to drive the turntable 23 to rotate. Since the eccentricity of the eccentric block 22 is different, install The eccentric block 22 at the same position makes the quality of the front and rear two turntables 23 unbalanced, and centrifugal force is generated during rotation, so that the brushless DC motor 21 produces the same forced vibration as the rotating speed frequency, while the brushless DC motor 21 and the bed board 11 are fixed as One piece, so the bed board 11 will also vibrate accordingly. The four sets of support springs 241, 242, 243, 244 at the corners of the bed are compressed or stretched by the vibration of the bed board 12 to realize the combined vibration with the bed board, and the eccentric block The greater the degree of mass imbalance caused by 22, the greater the dynamics (amplitude) of bed board 12 vibrations. Preferably, the heights and elastic coefficients of the four sets of support springs 241, 242, 243, 244 are different, and the digital signal processor 20 adjusts the speed of the brushless DC motor 21 according to the information of the irregular vibration of the train, so that the bed board 11 and the supporting springs can be adjusted. The combined vibration of the spring 24 realizes that the crib imitates the up and down vibration of the train, thereby easily coaxing the baby to sleep at a more suitable vibration frequency. In other embodiments of the present invention, multiple groups of support springs are also installed between the bed board 11 and the surrounding brackets of the crib, wherein the tension and compression directions of the multiple groups of support springs positioned at the front and back of the bed board 11 are the same as those before and after the bed board 11. The direction of motion is consistent, in order to realize the imitation of the front and rear vibration of the crib to the train; Imitation of side-to-side vibration. Preferably, the lengths and elastic coefficients of all the supporting springs in their natural state are different, so that the up and down vibration amplitudes, left and right vibration amplitudes, and front and rear vibration amplitudes of the bed board 11 are all different, and finally the best train vibration state simulation is realized.

The button input circuit 26 and the start-stop button circuit 27 are connected to the input terminal of the digital signal processor 20, the output terminal of the digital signal processor 20 is connected to the input terminal of the motor drive circuit 25 and the display 28, and the motor drive circuit 25 drives the brushless DC The motor 21 runs to control the vibration of the crib 10, and the start and stop button 27 controls the start and stop of the brushless DC motor 21; the digital signal processor 20 is connected with the information memory 29, and can read information in the information memory 29 or write information to the information storage 29, and the vibration information manually input by the user on the key of the key input circuit 26 is converted into train vibration information and the historical vibration information read from the information storage 29 is converted into train vibration information, and According to the vibration information of the train, the motor drive circuit 25 is controlled to drive the operation of the brushless DC motor, so that the crib 10 vibrates according to the vibration mode of the moving train. Wherein, the vibration information manually input by the user on the keys of the key input circuit 26 may be the vibration frequency, or may be related train running data such as the speed of the train and the length of the rail. When the manually input vibration information is the vibration frequency, the preferred manual input range of the vibration frequency is 2 Hz-8.8 Hz. When the manually input vibration information is train travel related data, preferably, the manual input range of the train speed is 90Km/h～400Km/h; the rail length of the train is 12.5m or 25m, at this moment, the digital signal processor 20. Convert these relevant train running data into train vibration frequency, the calculation formula is as follows:

train vibration frequency Among them, each revolution of the brushless DC motor is a vibration cycle. For example, the speed of a train running smoothly is about 90Km/h to 120Km/h, that is, 25m/s to 34m/s, and the corresponding rail length is 12.5m; digital signal The processor 20 obtains that the train vibration frequency is between 2.0 Hz and 2.72 Hz according to the train vibration frequency calculation formula, and the integer value thereof is 2.0 Hz to 3.0 Hz. The digital signal processor 20 uses the calculated vibration frequency or the input vibration frequency as the set vibration frequency, and after starting the brushless DC motor, it will control the rotational frequency of the motor shaft 211 of the brushless DC motor 21 in an S-curve manner. Rise to the set vibration frequency, thereby finally controlling the vibration frequency of the crib 10 to rise to the set vibration frequency in the form of an S-shaped curve; in the process of stopping the brushless DC motor, the motor shaft of the brushless DC motor 21 will be controlled The rotation frequency of 211 drops to 0 with an S curve, that is, stops, so that the vibration frequency of the crib 10 is finally controlled to drop with an S curve until the brushless DC motor stops; preferably, when the set vibration frequency is less than or equal to 2.5Hz When the vibration frequency rises or falls, the time can be set to 2s; when the set vibration frequency is greater than 2.5Hz, the vibration frequency rises or falls time can be set to 3s.

Please refer to FIG. 4 , in this embodiment, the display 28 may be an LCD12864, and the digital signal processor may be a TMS320F2812PGF processing chip. The start and stop buttons 27 include a start button to start the brushless DC motor 21 and a stop button to stop the brushless DC motor 21 from working. The vibration information of key input circuit 26 input and the historical vibration information of calling are vibration frequency, so key input circuit 26 comprises vibration frequency increase key, vibration frequency decrease key, manual input vibration frequency mode selection key, continue to use history vibration frequency mode selection Button and whether the frequency is appropriate to judge the button, the manual input vibration frequency mode selection button is used to provide the user with the selection confirmation of the manual input vibration frequency mode, after the user manually inputs a reasonable vibration frequency, the digital signal processor 20 will complete the vibration frequency The change of the historical vibration frequency mode selection button is used to provide the user with the selection confirmation of the last historical vibration frequency. After the user presses this button, the digital signal processor 20 will read the historical vibration in the information memory 29 Frequency and complete the change of the vibration frequency; the vibration frequency increase button is used to increase the vibration frequency, the vibration frequency decrease button is used to decrease the vibration frequency, the vibration frequency increase button, the vibration frequency decrease button, manual input vibration frequency mode selection The combined use of the buttons enables the user to manually input the vibration frequency; the frequency judgment button is used to judge whether the set vibration frequency is within the required input range, that is, whether it meets the calculation range requirements of the digital signal processor 20 . Each of the above keys is connected to the GPIO port of the digital signal processor 20 .

The motor driving circuit 25 of the present embodiment is composed of six power transistors PWM1, PWM2, PWM3, PWM4, PWM5, and PWM6 connected in parallel, and the gates of the transistors PWM1, PWM2, PWM3, PWM4, PWM5, and PWM6 are respectively connected to the digital signal processor. Each PWM output port PWM1, PWM2, PWM3, PWM4, PWM5, PWM6 of 20, digital signal processor 20 outputs corresponding PWM (pulse width modulation) signal through its output port PWM1, PWM2, PWM3, PWM4, PWM5, PWM6 Correspondingly control the work of the six power transistors PWM1, PWM2, PWM3, PWM4, PWM5, and PWM6; the drains of the transistors PWM1, PWM2, PWM3, PWM4, PWM5, and PWM6 are connected in parallel to the positive pole of the power supply; the transistors PWM1, PWM2, PWM3, and PWM4 , PWM5, and PWM6 are connected in parallel to the negative pole of the power supply, and the sources of PWM1, PWM3, and PWM5 are respectively connected to the three-phase windings A, B, and C of the brushless DC motor 21, and the Hall output of the brushless DC motor 21 Terminals CAP1, CAP2, and CAP3 are respectively connected to digital signal processing 20 Hall input ports CAP1, CAP2, and CAP3.

Below in conjunction with accompanying drawing 1 to Fig. 6, introduce in detail the control method of the baby bed electric vibrating device of the present invention to the baby bed vibration, described control method comprises the following steps:

(1) The user selects the manual input vibration frequency mode or continues to use the historical vibration frequency mode through the manual input vibration frequency mode selection button of the key input circuit 26 or continues to use the historical vibration frequency mode selection button;

(2) If the manual input vibration frequency mode is selected, the vibration frequency input interface of the display 38 is entered, and the user selects a suitable vibration frequency by increasing the vibration frequency button and decreasing button of the button input circuit 26 to be used. In the embodiment, the manual input range of the vibration frequency is between 2Hz and 8.8Hz, and the user can judge whether the frequency of the manual input is appropriate by pressing the button to determine whether the frequency of the input circuit 26 is appropriate. If it is appropriate, then The vibration frequency of the second input will be provided to the digital signal processor 20 to be processed. If it is not suitable, the vibration frequency of the manual input is adjusted by increasing the key and reducing the key of the vibration frequency of the key input circuit 26 again until it is determined as far as is appropriate;

(3) If you choose to continue to use the historical vibration frequency mode, first the digital information processor 20 can judge whether there is historical vibration frequency information in the information memory 29, if there is, then enter the next step, if not, then jump to step (2) ;

(4) After selecting a suitable vibration frequency, the user presses the start key in the start-stop button circuit 27, and the digital information processor 20 converts the vibration frequency into train vibration information to control the motor drive circuit 25 to drive the brushless DC The motor 21 is running, and at the same time, the vibration frequency used this time will be recorded in the information memory 29; specifically, the digital signal processor 20 outputs the S-shaped curve rising control information according to the vibration frequency, so that the motor drive circuit 25 drives the brushless DC motor The rotational speed of the motor shaft 211 of 21 also rises in this S-shaped curve, and the mass of the eccentric block 22 is unbalanced, so that centrifugal force is generated when the turntable 23 on the motor shaft 211 of the brushless DC motor 21 rotates, so that the brushless DC motor 21 drives the baby The vibration frequency of the bed board 11 starts from 0 and rises to the vibration frequency selected by the user in an S-shaped curve. The bed board 1 of the crib drives the support spring 24 to perform forced compound vibration, and the vibration amplitude of the bed board 11 is controlled by the support spring 24 regulation to simulate the vibration pattern of a train starting to run;

(5) After the user presses the stop button in the start-stop button circuit 27, the digital information processor 20 outputs the S-shaped curve descending control information according to the vibration frequency, so that the motor drive circuit 25 drives the brushless DC motor 21 at the same speed. Decline with the S-shaped curve until the brushless DC motor 21 stops, to simulate the vibration mode of the train that is about to stop, so that the vibration frequency of the crib drops to 0 with the S-shaped curve; wherein, when the vibration frequency selected by the user is less than When it is equal to 2.5Hz, the crib’s vibration frequency rises or falls along the S-curve for 2s; when the vibration frequency selected by the user is greater than 2.5Hz, the crib’s vibration frequency rises or falls along the S-curve for 3s.

In addition, when the vibration frequency of the crib rises to the vibration frequency selected by the user in an S-shaped curve, the crib will maintain the vibration frequency, but when the user finds that the vibration frequency is not suitable for coaxing the baby in the crib to sleep , the user can press the button again to judge whether the frequency of the input circuit 26 is appropriate, and the digital signal processor 20 will control the PWM signal of the motor drive circuit 25 to drive the speed of the brushless DC motor 21 down to 0, thereby controlling the vibration frequency of the crib to automatically drop along the S-shaped curve until the brushless DC motor 21 stops, and then jump to step (2), that is, the interface of the control display 28 jumps to the vibration frequency of the manual input vibration frequency mode The input interface is waiting for the user to input a new vibration frequency. It can be seen that the electric vibrating device for the crib of the present invention can lull the baby to sleep when the vibration frequency is suitable, and can provide the baby with a feeling of riding a toy train when the vibration frequency is not suitable, and has more practicability.

Please refer to FIG. 6 , the vibration frequency curve of the stroller in this embodiment is the ft curve in FIG. 6 . Among them, the vibration frequency of the crib rises from 0 to the vibration frequency f ₀ input by the user in an S-shaped curve within the time period T1+T2, which is equivalent to the stage when the train starts to run; the vibration frequency of the crib rises within the time period T3 Maintaining f ₀ , this stage is equivalent to the stage of train running smoothly; the vibration frequency of the crib falls from f ₀ to 0 in an S-shaped curve within the time period T4+T5, and this stage is equivalent to the train stop stage. And the change rate df/dt of the S-shaped curve over time of the vibration frequency f of the baby bed in the T1+T2 time period is generally positive, and the change rate df/dt in the T1 time period and the change rate df/dt in the T2 time period dt is in the shape of an isosceles triangle A, the change acceleration d ² f/dt ² in the T1 time period is a constant positive value J, and the change acceleration d ² f/dt ² in the T2 time period is a constant negative value -J; in T4+T5 The change rate df/dt of the S-shaped curve over time in the time period is generally negative, and the change rate df/dt in the T4 time period and the change rate df/dt in the T5 time period form an inverted isosceles triangle-D, which The inverted isosceles triangle-D is mirror-symmetrical with the change rate of the isosceles triangle A in the time period T1+T2, the change acceleration d ² f/dt ² in the time period T4 is a constant negative value -J, and the acceleration in the time period T5 is The varying acceleration d ² f/dt ² is a constant positive value J. Therefore, in this embodiment, the control of the brushless DC motor by the digital signal processing 20 is relatively stable, which can ensure the safety of using the crib.

Claims (10)

1. An electric vibrating device for a crib that simulates train vibrations, characterized in that it comprises a brushless DC motor, two eccentric blocks, two turntables, multiple sets of support springs, a motor drive circuit, a button input circuit, and a start-stop button circuit, display, information memory and digital signal processor; the brushless DC motor is horizontally fixed on the center of the bottom surface of the bed board of the baby crib, and the motor shaft is connected with a turntable before and after, and a turntable is fixed on each turntable The eccentric block; four sets of support springs in the multiple sets of support springs are respectively fixed between the four corners of the bed board of the crib and the base of the crib; the key input circuit and the start and stop key circuit are respectively connected to the input of the digital signal processor, the input of the motor drive circuit and the input of the display are respectively connected to the output of the digital signal processor; the output of the motor drive circuit is connected to The brushless DC motor is used to drive the brushless DC motor to run, the start-stop button circuit controls the start and stop of the brushless DC motor; the digital signal processor is connected to the information memory, and the button input circuit includes For the buttons for manually inputting vibration information and the buttons for calling historical vibration information, the vibration frequency of the baby crib simulating train vibration is 0-8.8 Hz. 2. The electric vibrating device of the crib as claimed in claim 1, wherein the installation positions of the two eccentric blocks are the same; the multiple groups of support springs also include the front, Back, left, right, and stretched or compressed support springs along the plane of the bed board. 3. The electric vibrating device of the crib as claimed in claim 1, characterized in that, the vibration information manually input on the key of the key input circuit is the train vibration frequency, or the vibration information manually input on the key of the key input circuit Input vibration information includes train speed and rail length. 4. The electric vibration device for a crib according to claim 3, wherein the manual input range of the vibration frequency is 2Hz-8.8Hz. 5. The electric vibrating device of the crib as claimed in claim 3, characterized in that, the manual input range of the traveling speed of the train is 90Km/h～400Km/h; the rail length of the train is 12.5m or 25m . 6. The electric vibrating device of baby bed as claimed in claim 3, is characterized in that, the vehicle speed of described train and rail length are converted into train vibration frequency, and the formula of described transformation is: train vibration frequency 7. The method for controlling the vibration of the baby bed by the electric vibration device of the baby bed according to any one of claims 1 to 6, characterized in that, comprising: (1) The user selects the manual input vibration information mode or continues to use the historical vibration information mode through the key of the key input circuit of the electric vibration device; (2) In the manual input vibration information mode, after the user inputs the required vibration information through the keys of the key input circuit, he presses the start key in the start-stop key circuit of the electric vibration device; The digital signal processor of the device converts the vibration information into train vibration information, and controls the motor drive circuit of the electric vibration device to drive the operation of the brushless DC motor of the electric vibration device according to the train vibration information. The bed vibrates in a simulated train vibration mode, and the vibration frequency is 0-8.8 Hz; at the same time, the digital signal processor will write the vibration information input this time into the information memory of the electrodynamic vibration device; (3) In the mode of continuing to use the historical vibration information, the user calls the historical vibration information in the information memory through the key of the key input circuit, presses the start key, and the digital signal processor will record the historical vibration information The information is converted into train vibration information, and the motor drive circuit is controlled according to the train vibration information to drive the operation of the brushless DC motor. The baby cot vibrates in a simulated train vibration mode, and the vibration frequency is 0-8.8 Hz. 8. The method according to claim 7, wherein the vibration information input by the user and the historical vibration information called are the train vibration frequency, and the digital signal processor converts the train vibration frequency into train vibration information; The vibration information input by the user and the historical vibration information called are both the speed of the train and the length of the rail, and the digital signal processor calculates the vibration frequency of the train according to the speed of the train and the length of the rail 9. The method according to claim 8, wherein the vibration process of the crib according to the train vibration mode of running comprises: after the brushless DC motor starts running, the vibration frequency of the crib will be The way of S-shaped curve rises to the vibration frequency input by the user or the historical vibration frequency called; The brushless DC motor stalls. 10. The method according to claim 9, wherein when the vibration frequency input by the user or the historical vibration frequency called is less than or equal to 2.5 Hz, the vibration frequency of the crib rises or falls with an S-curve The time is 2s; when the vibration frequency input by the user or the historical vibration frequency called is greater than 2.5Hz, the time for the vibration frequency of the crib to rise or fall in an S-shaped curve is 3s.