Patent ID: 12256841

DETAILED DESCRIPTION OF EMBODIMENTS

Detailed description of the embodiments of the present invention will be made below in combination with the accompanying drawings of the description.

As shown inFIG.1, a lift table with an intelligent adjusting function is provided with an intelligent adjusting device, where the intelligent adjusting device includes an infrared pyroelectric detection unit for detecting whether a user moves in an appointed position of the lift table, an infrared thermopile detection unit for detecting whether there is the user in the appointed position of the lift table and there is the user continuously, and a table-top height adjusting unit that adjusts the lift table from the current height to a target height; the table-top height adjusting unit includes a driving unit and a motor unit; the motor unit includes a motor and a transmission device; the transmission device is connected between the motor and an adjustable table-top of the lift table body; and the infrared pyroelectric detection unit and the infrared thermopile detection unit both are connected to the driving unit.

The intelligent adjusting device further includes a table-top height detection unit formed by software programs arranged in the driving unit and an upper computer matched by a hardware for detecting the current height of the lift table, an intelligent judging unit for judging whether the user is in a sitting posture state for a long time, a table-top height adjusting unit for adjusting the lift table from the current height to the target height according to the height information, a table-top height set parameter unit for a client to preset a sitting posture range and a standing posture range, and a table-top height manual setting unit for the client to subjectively adjust the height.

The above-mentioned software programs all are known programs in the prior art, which are not defined and protected in the embodiment.

As an implementation mode of the present invention, the infrared pyroelectric detection unit is an infrared pyroelectric sensor, the infrared thermopile detection unit is an infrared thermopile sensor, and the transmission device is a drive gear box.

As an implementation mode of the present invention, as shown inFIG.2, the table-top height adjusting unit includes a driving unit and a motor unit. The driving unit S10includes a PID control unit S101, a PWM generator S102, an H bridge driver S103and a Hall signal capture unit S104, where the Hall signal capture unit is electrically connected to the PID control unit S101, the PID control unit S101is electrically connected to the PWM generator S102, and the PWM generator S102is electrically connected to the H bridge driver S103; the motor unit S20includes a motor winding S201, a drive gear box S202and a Hall sensor S203, where the motor winding S201is connected to the H bridge driver S103, and the Hall sensor S203is electrically connected to the Hall signal capture unit S104.

The drive gear box S202can be driven in form of single motor, double motor or multiple motors, and the quantity of the motors can be set according to actual conditions, which is not defined in the embodiment.

The PID control unit S101is used for controlling a duty cycle of the PWM generator S102according to rotating speed information collected by the Hall signal capture unit S104, the PWM generator S102is used for generating PWM so as to realize an adjustable voltage, the H bridge driver S103is used for applying positive and negative voltages to the winding S201so as to realize a forward and backward rotating function, and the Hall signal capture unit S104is used for collecting rotating speed information.

A working process of the present invention can be as follows:1. The intelligent adjusting device is initialized;2. Whether there is the user who moves in the appointed position of the lift table by using the infrared pyroelectric detection unit, and whether there is the user persistently in the appointed position of the lift table by using the infrared thermopile detection unit;3. The current table-top height is detected by using the table-top height detection unit, so as to judge whether the user is in a sitting posture;4. When it is detected that the height of the lift table is in the user sitting posture range and there is the user who moves in the appointed position, whether the user is in the sitting posture state for a long time is judged real time;5. If the user is in the sitting posture state for a long time, the height of the table-top is intelligently adjusted imperceptibly to remind and correct the moving posture of the user or switch the postures.

Judging the movement of the user in S2is specifically described as follows:If electric signals of pyroelectricity and infrared thermopile change randomly within a specified interval time, it is judged that the state of the user at the moment changes;If a high level is turned to a low level in the set time interval, it is judged that the user enters the appointed position;If the low level is turned to the high level in the set time interval, it is judged that the user leaves the appointed position;Under circumstances that it is detected by pyroelectricity that there is the user who moves, and it has been judged that the user enters the appointed, it is judged that the user is maintained in the appointed position;Under circumstances that the infrared thermopile continuously outputs the low level, and it has been judged that the user enters the appointed, it is judged that the user is maintained in the appointed position;If the above-mentioned movement of the user and outputting of the low level continuously by the infrared thermopile are detected at the same time, it is judged that the user is maintained in the appointed position regardless of whether it is judged that the user enters previously;When movement of the user cannot be detected continuously by pyroelectricity and the infrared thermopile continuously outputs the high level, it is judged that the user leaves the appointed position.

Judging the sitting posture of the user in S3is specifically described as follows:

When the height of the table-top is in the sitting posture height range predetermined by the user, and there is the user who moves in the appointed position, it is judged that the current user is in the sitting posture; when the height of the table-top is not in the sitting posture range, an imperceptible intelligent adjusting function logic will not be activated.

The imperceptible intelligent adjusting function logic includes:imperceptible intelligent adjustment is adjustment of the height of the table-top under a circumstance that user's attention is not drawn;an adjusting mode is that micro-motion of the table-top is realized by controlling soft start of the motor and operation at an ultra-low uniform speed;the adjusted height every time is controlled within 2 cm;the adjusting time interval is predetermined (1-3 min default in the embodiment);soft start: the input voltage of the motor is adjusted by PWM, so that the motor is turned to running state from static state, and in the process, vibration or jitter is not generated;ultra low speed operation is kept: after the motor enters the running state, the motor is kept to run at the ultra low uniform speed by setting reasonable PWM;motor rotating speed detection is acquired by feedback of a Hall apparatus, and forms closed loop control to the motor together with PWM.

The process of judging whether the user is in the sitting posture state for a long time in S4includes:when it is detected that the height of the lift table is in the user sitting posture range and there is the user who moves in the appointed position, timing is started to obtain a sitting posture duration of the use in the appointed position;after the sitting posture duration reaches the preset numerical value, it is judged that the user is in the sitting posture state for a long time, namely, the user is in a sedentary state.

When it is judged that the user is in the sedentary state, the height of the lift table is intelligently adjusted imperceptibly according to the predetermined speed till the sitting posture height predetermined by the user is reached; after timing is started, detection information changes, and it is judged whether the sitting posture duration timing this time is finished according to new information; in the timing process, when it is detected that there is no user who moves in the appointed position, it is judged that the user leaves the appointed position, sitting posture timing is stopped and zeroed, and leaving time timing of the user is started; when the leaving time timing of the user reaches the predetermined numerical value, the table-top restores to the predetermined sitting posture height automatically.

Whether imperceptible intelligent intervention function of the intelligent adjusting device is started can be manually started or closed.

The specific process of adjusting the height of the table-top through regulation of the driving unit S10and the motor unit S20is as follows:1. After the system receives an operating instruction, an ultra low target speed Speed_Target is set and converted into a table-top lift speed of 1 mm/s, the Hall signal capture unit S104is enable to convert an output signal of the Hall sensor S203to obtain an actual running rotating speed Speed_Run and position information;2. Then an upper bridge arm of the H bridge driver S103is conducted, another bridge arm is controlled by the PWM generator S102: the driving unit set the starting duty cycle Duty_Start stored previously to the PWM generator S102;3. In the starting stage, the table-top runs slowly: equivalent voltages previously applied to two ends of the motor winding S201are insufficient to run the motor, the PWM generator S102controls the H bridge driver S103at a rate of increasing 0.2% duty cycle per 50 millisecond, so that voltages at two ends of the winding S201are increased. When it is increased continuously till there are changes on rotating speed and position signal, the driving unit S10enters a constant rotating speed running PID control stage;4. The constant rotating speed running PID control stage: as shown in formula and block diagram below, difference between the running rotating speed Speed_Run and the target rotating speed Speed_Target is made to obtain e(k), the PID controller unit S101adjusts the duty cycle of the PWM generator S102according to the rotating speed difference, so that the motor runs at a low constant rotating speed, and further, the table-top lifts at a speed of 1 mm/s.
PWM_Duty=Kp*e(k)+Ki*Σe(k)+Kd[e(k)−e(k−1)]5. Integral averaging is made on duty cycle of PWM during constant rotating speed running, and it is multiplied by 0.7 as an initial duty cycle of next start;6. When the table-top lifts 5 mm, the table-top is decreased in speed and stopped: the driving unit S10controls the duty cycle of PWM at a rate of decreasing 0.5% per 50 milliseconds. When the duty cycle is decreased to Duty_Start, PWM output is cut off, the motor stops and the table-top stops lifting;7. After it is stopped to wait for 60 s, it enters a next “start-run-stop” cycle, and S1to S6are repeated till the height predetermined by the user is met.

Finally, it should be noted that the above-mentioned embodiments are merely specific implementation modes of the present invention and are used to explain the technical solution of the present invention and shall not be construed as limitation. The scope of protection of the present invention is not limited herein. Despite reference to the aforementioned embodiments to make a detailed description for the present invention, it will be understood by those of ordinary skill in the art that those skilled in the art still can modify the technical solution recorded by the aforementioned embodiments or can come up with changes easily or make equivalent substitutions on part of technical features therein within the technical scope uncovered by the present invention. Such modifications, changes or substitutions do not deviate the nature of the technical solution from the spirit and scope of the technical solution embodied in the embodiments according to the present invention. They shall be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.