CN104864689A - FPGA-based wet umbrella rapid and automatic drying machine and control method thereof - Google Patents

Abstract

The invention discloses an FPGA-based fast automatic drying machine for wet umbrellas and a control method thereof. The drying machine includes a cylindrical cylinder, an umbrella rotating device is arranged at the bottom of the cylinder, and a humidity collection device is arranged on the inner wall of the cylinder. module, the top and bottom of the cylinder side wall are respectively connected to the hot air circulation system, and the umbrella rotating device, the humidity collection module and the hot air circulating system are all connected to the FPGA control center; the umbrella rotating device includes a vertically arranged first rotating shaft , the first rotating shaft is connected to the servo motor, and the FPGA control center controls the servo motor to drive the umbrella to rotate through the first rotating shaft. The wet umbrella rapid automatic dryer and its control method provided by the present invention use the humidity sensor in the dryer to collect the humidity of each part, calculate the humidity weight through the RBF algorithm, and then the FPGA control center controls the servo motor according to the humidity weight The speed, pulse electric field, and hot air circulation system work synchronously, so as to achieve the effect of quickly drying the wet umbrella.

Description

An FPGA-based fast automatic drying machine for wet umbrellas and its control method

technical field

The invention relates to an FPGA-based fast automatic drying machine for wet umbrellas and a control method thereof.

Background technique

On rainy days, when customers visit large supermarkets, shopping malls and other places, they all carry wet umbrellas with them, which is not only wet and messy but also easy for customers to slip. In order to solve this problem, most shopping malls provide plastic bags, but plastic bags are not environmentally friendly, and sometimes plastic bags break, which will cause some troubles. There are some wet umbrella drying devices and methods at present, but they need to be controlled by people.

Contents of the invention

The object of the present invention is to provide a fast automatic drying machine for wet umbrellas and its control method based on FPGA control.

Technical scheme of the present invention is:

A fast automatic dryer for wet umbrellas based on FPGA, the dryer includes a cylindrical cylinder, the bottom of the cylinder is provided with an umbrella rotating device, the inner wall of the cylinder is provided with a humidity collection module, and the side wall of the cylinder The top and the bottom are respectively connected to the hot air circulation system, and the umbrella rotating device, the humidity collection module and the hot air circulating system are all connected to the FPGA control center; the umbrella rotating device includes a vertically arranged first rotating shaft, and the first rotating shaft is connected to the The servo motor FPGA control center controls the servo motor to drive the umbrella to rotate through the first rotating shaft.

Preferably, a cover plate is provided on the top of the cylinder, and the cover plates are two semicircular cover plates with a card slot in the middle of the two semicircular cover plates; the cover plate is connected with a timer, and the timer The PWM wave is output, and the cover plate acts as a load layer for positive charges.

Preferably, a horizontal disc is fixed on the top of the first rotating shaft, the disc is connected with a timer, the timer outputs PWM waves, and the disc serves as a negative charge load layer, forming an electric field between the cover plate and the disc .

Preferably, a cylinder cover is also placed above the cover plate.

Preferably, a circle of dense vertical convex teeth is provided on the side surface of the first rotating shaft, vertical convex teeth matching the first rotating shaft are provided on the side surface of the second rotating shaft of the servo motor, and the first rotating shaft is higher than the second rotating shaft. Two rotating shafts, the outer side of the first rotating shaft is covered with a spring, the upper end of the spring contacts the lower surface of the disc, and the lower end contacts the top of the second rotating shaft.

Preferably, the humidity acquisition module includes 16 humidity sensors, the 16 humidity sensors are divided into 4 layers, and 4 of each layer are distributed on the inner wall of the cylinder, and each humidity sensor collects humidity information at its respective position and sends it to the FPGA control center.

Preferably, an ultraviolet lamp is also provided on the inner wall of the cylinder, and the ultraviolet lamp is connected and controlled by the FPGA control center.

Preferably, a circular inner ring is fixed in the middle of the cylinder, and the diameter of the circular inner ring is 2 to 4 times that of the umbrella.

Preferably, a trigger button is provided on the top of the first rotating shaft, and the trigger button is connected to the FPGA control center.

A kind of control method of wet umbrella fast automatic drying machine based on FPGA, described control method comprises steps:

1) When an umbrella is put into the dryer, the front end of the umbrella touches the trigger button, the dryer starts to work, and the FPGA control center controls the cover and the cylinder cover to close successively;

2) Humidity sensors collect humidity signals at their respective locations and send them to the FPGA control center. The FPGA control center uses the RBF algorithm to calculate the humidity weight in the dryer and judge whether the humidity weight is greater than the set threshold;

3) If the humidity weight is greater than the set threshold, the FPGA control center controls the servo motor to rotate at a certain speed, controls the hot air circulation system to feed hot air into the dryer, controls the pulse electric field generated between the cover plate and the disc, and turns on the ultraviolet light. lamp;

4) If the humidity weight is less than the set threshold, the FPGA control center controls to turn off the servo motor, hot air circulation system, pulse electric field and ultraviolet lamp, and then controls to open the cover and cylinder cover to end the drying.

The advantages of the present invention are:

The FPGA-based fast automatic drying machine for wet umbrellas and its control method provided by the present invention use the humidity sensor in the dryer to collect the humidity of each part, calculate the humidity weight through the RBF algorithm, and then the FPGA control center controls the humidity according to the humidity weight. The speed of the servo motor, the pulse electric field, and the hot air circulation system work synchronously, so as to achieve the effect of quickly drying wet umbrellas. It is simple and practical, easy to operate, safe, and has a small footprint, suitable for mass promotion.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Fig. 1 is the plane structure schematic diagram of wet umbrella fast automatic drying machine of the present invention;

Fig. 2 is the perspective view of the main structure of the wet umbrella fast automatic drying machine of the present invention;

Fig. 3 is a schematic diagram of the opening and closing of the cover plate according to the embodiment of the present invention;

Fig. 4 is a schematic diagram of the opening and closing of the cylinder cover according to the embodiment of the present invention;

Fig. 5 is the FPGA control center connection schematic diagram of the embodiment of the present invention;

FIG. 6 is a schematic diagram of the humidity sensor calculating the humidity weight using the RBF algorithm according to the embodiment of the present invention;

Fig. 7 is a schematic diagram of raindrop transformation under the action of a pulsed electric field according to an embodiment of the present invention;

Fig. 8 is a work flow chart of the wet umbrella fast automatic drying machine of the present invention.

Detailed ways

As shown in Figures 1 and 2, the quick automatic drying machine for wet umbrellas disclosed by the present invention includes a cylindrical cylinder 1, and an umbrella rotating device is provided at the bottom of the cylinder 1, and the umbrella rotating device includes The first rotating shaft 2 arranged vertically, the lower end of the first rotating shaft 2 is connected to the second rotating shaft 12 of the servo motor, the side surface of the first rotating shaft 2 is provided with a circle of dense vertical convex teeth, the second rotating shaft 12 of the servo motor The side surface of the side surface is provided with vertical protruding teeth suitable for the first rotating shaft 2, the first rotating shaft 2 is higher than the second rotating shaft 12, the FPGA control center controls the servo motor, and the second rotating shaft 12 drives the first rotating shaft 2 to rotate, through The first rotating shaft 2 drives the umbrella to rotate. A humidity sensor 3 is arranged on the inner wall of the cylinder, and the top and bottom of the side wall of the cylinder are respectively connected to the hot air circulation system 4, and the umbrella rotating device, the humidity collection module and the hot air circulation system are all connected to the FPGA control center. The top of the cylinder is provided with a cover plate 5 and a cylinder cover 6, and a horizontal disk 7 is fixed outside the first rotating shaft. The cover plate 5 and the disk 7 are respectively connected to the timer, and the cover plate 5 and the disk 7 is used as the load layer of positive and negative charges respectively, and the FPGA control center configures a timer to generate a PWM wave, forming a pulse electric field between the cover plate and the disk. The top of the first rotating shaft is provided with a trigger button 11, which can trigger the operation of the whole system under the action of the umbrella. There is also a spring 8 on the outside of the first rotating shaft. The upper end of the spring contacts the lower surface of the disk, and the lower end contacts the top of the second rotating shaft. The first rotating shaft 2 can move up and down along the convex teeth under the pressure of the umbrella and the elastic force of the spring. Displacement to accommodate different umbrella lengths. The ultraviolet lamp 9 connected and controlled by the FPGA control center is also installed on the inner wall of the cylinder. A circular inner ring 10 is also fixed in the middle of the cylinder, and the diameter of the circular inner ring is 3 times that of the umbrella. Even if the umbrella is opened when rotating at high speed, it can protect the umbrella and protect the drier simultaneously.

The dryer has a diameter of 40cm and a height of 100cm, so it occupies a small area. The design of 100cm is for safety and to prevent accidents caused by mischievous children.

The humidity acquisition module includes 16 humidity sensors. The 16 humidity sensors are divided into 4 layers, and 4 of each layer are distributed on the inner wall of the cylinder. The humidity sensor uses VHR01-SPI, which is a digital sensor based on temperature and relative humidity. Type temperature and humidity sensor module, the SPI interface outputs temperature and relative humidity, and each humidity sensor collects the temperature and humidity information at its own position and sends it to the FPGA control center.

The hot air circulation system is generated by a heat pump. In order to achieve the effect of fast drying, the wind speed of the heat pump is controlled to keep the temperature inside the cylinder constant at 70°C. Four ultraviolet disinfection lamps are installed around the inner wall of the cylinder to quickly kill bacteria. There is a drain on the side wall of the dryer, the bottom is connected to the rainwater collector, and finally connected to the sewer.

Figure 3 and Figure 4 are schematic diagrams of the two states of opening and closing of the cover plate and the cylinder cover respectively. The cover plate includes two semicircular cover pieces with a slot in the middle. Both the cylinder cover and the two cover plates are opened; when the wet umbrella is put into the dryer to withstand the trigger button on the first rotating shaft, an interruption is triggered, and the FPGA control center controls the two cover plates of the cover plate to move inward, blocking the umbrella handle, and then close the lid. After the cylinder cover is closed, avoid any material flying out and scratching others during high-speed rotation. When the umbrella touches the trigger button and the cover plate is closed, the servo motor is started.

Fig. 5 The FPGA control center uses the EP4CE15F17C8N chip of the Altera Cyclone IV series. When programming, it integrates RBF algorithm and real-time operating system control, so as to control the servo motor, hot air circulation system and pulse electric field more accurately and in real time. There are 16 humidity sensors in total, with 4 layers distributed from top to bottom and 4 on each layer, to collect the humidity values of different parts in real time. Humidity sensors on the same layer take the average value (higher precision), and then calculate the humidity weight (compensation) through the RBF algorithm on the average value of different layers. Take the four humidity parameters as input values and the rotation parameter as the target value. Construct an RBF neural network, as shown in Figure 6. The humidity parameters obtained in the early stage are used as the training set, and cluster analysis is performed on it to determine the center and width of the activation function of neurons in the hidden layer of RBF. Use the training set to train the RBF network and determine the weights from the output layer to the hidden layer. The activation function of the RBF hidden layer neurons is a radial basis function, the closer the hidden layer input value is to the previously determined center, the greater the neuron output value. The desired output is obtained by weighted summation. The humidity value in the bucket is obtained through the RBF algorithm, which is transmitted to the FPGA control center, and then compared with the preset threshold to control the servo motor, thermal cycle and pulse electric field. There is a hidden layer, w _mi is the weight from the input layer to the hidden layer, m, i are the input neurons and hidden layer nodes respectively; w _i is the weight from the hidden layer to the output layer; I is the hidden layer The number of layer nodes.

The following is the speed at which the FPGA control center controls the servo motor to drive the first shaft when the relative humidity is in different intervals:

1) The relative humidity is greater than 90, and the speed is 100 rpm;

2) The relative humidity is greater than 80, and the speed is 80 rpm;

3) The relative humidity is greater than 70, and the speed is 60 rpm;

4) The relative humidity is greater than 50, and the speed is 40 rpm;

5) The relative humidity is greater than 40, and the speed is 20 rpm;

6) When the relative humidity is less than 20, turn off the servo motor, turn off the hot air circulation, turn off the pulse electric field, and then open the cylinder cover and cover plate;

The cover plate and the disk are respectively used as the load layer of positive and negative charges. The FPGA control center configures a timer to generate PWM waves, and a pulse electric field is formed between the cover plate and the disk. The principle is to set a value N, and the counting of the timer starts from 0 , when the count value is less than N, the timer outputs a positive charge, when the count value is greater than N, the timer outputs 0, the timer can generate 4 PWM waves, we use 2 counts to generate 2 PWM waves, respectively in the cover Positive and negative charges are accumulated on the board and disk to form a pulsed electric field. The FPGA control center controls the frequency and duty cycle of the PWM wave. Through the counting of the counter, once the count reaches the set value, a response is triggered to realize the corresponding charge and discharge tasks. . Figure 7 is a schematic diagram of raindrop transformation under the action of a pulsed electric field. Under the action of an electric field, small raindrops are deformed by force, so that small water droplets condense to form large water droplets, thereby increasing gravity. Therefore, from the perspective of force, the force of water droplets is greater , are more likely to be thrown out. Once the wet umbrella starts to dry, an electric field with a duty cycle of 50% and a frequency of 10KHz is applied between the cover plate and the disc; on the contrary, after the drying is completed, the electric field is also stopped.

Fig. 8 is a flow chart of the drying process of the umbrella to the drying machine, and the specific steps are:

1) When an umbrella is put into the dryer, the front end of the umbrella touches the trigger button, the dryer starts to work, and the FPGA control center controls the cover and the cylinder cover to close successively;

2) Humidity sensors collect humidity signals at their respective locations and send them to the FPGA control center. The FPGA control center uses the RBF algorithm to calculate the humidity weight in the dryer and judge whether the humidity weight is greater than the set threshold;

3) If the humidity weight is greater than the set threshold, the FPGA control center controls the servo motor to rotate at a certain speed, controls the hot air circulation system to feed hot air into the dryer, controls the pulse electric field generated between the cover plate and the disc, and turns on the ultraviolet light. lamp;

4) If the humidity weight is less than the set threshold, the FPGA control center controls to turn off the servo motor, hot air circulation system, pulse electric field and ultraviolet lamp, and then controls to open the cover and cylinder cover to end the drying.

The quick-drying wet umbrella dryer designed by this patent is simple and practical, easy to operate, safe, convenient and fast, and occupies a small area. Customers and shopping malls bring high-quality services.

The above-mentioned embodiments are only to illustrate the technical conception and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. the fast automatic drying machine of the wetted umbrella based on FPGA, it is characterized in that: described drying machine comprises a cylindrical barrel, described bottom of cylinder is provided with umbrella rotating device, cylinder madial wall is provided with humidity collection module, hot air circulating system is connected respectively in top and the bottom of cylinder side wall, and described umbrella rotating device, humidity collection module and hot air circulating system are all connected to FPGA control centre; Described umbrella rotating device comprises the first rotating shaft vertically arranged, and described first rotating shaft connects servomotor, and FPGA control centre controls servomotor, drives umbrella to rotate by the first rotating shaft.

2. the fast automatic drying machine of the wetted umbrella based on FPGA according to claim 1, is characterized in that: described barrel top is provided with cover plate, and described cover plate is the semicircle cover plate of two panels, with draw-in groove in the middle of the semicircle cover plate of two panels; Described cover plate is connected with timer, and timer exports PWM ripple, and cover plate is as the load layer of positive charge.

3. the fast automatic drying machine of the wetted umbrella based on FPGA according to claim 2, it is characterized in that: the disc of a level is fixed at described first rotating shaft top, described disc is connected with timer, timer exports PWM ripple, disc, as the load layer of negative electrical charge, forms electric field between cover plate and disc.

4. the fast automatic drying machine of the wetted umbrella based on FPGA according to claim 2, is characterized in that: be also stamped cover above described cover plate.

5. the fast automatic drying machine of the wetted umbrella based on FPGA according to claim 3, it is characterized in that: described first rotating shaft side surface is provided with the intensive vertical double wedge of a circle, the side surface of the second rotating shaft of servomotor is provided with the vertical double wedge suitable with the first rotating shaft, first rotating shaft is higher than the second rotating shaft, the outside cover of the first rotating shaft has a spring, the lower surface of described spring upper end contact disc, the top of lower end in contact second rotating shaft.

6. the fast automatic drying machine of the wetted umbrella based on FPGA according to claim 1, it is characterized in that: described humidity collection module comprises 16 humidity sensors, 16 humidity sensors are divided into 4 layers, every layer 4 to be distributed on cylinder madial wall, and the humidity information of each humidity sensor collection separately on position is sent to FPGA control centre.

7. the fast automatic drying machine of the wetted umbrella based on FPGA according to claim 1, it is characterized in that: described cylinder madial wall is also provided with ultraviolet lamp, described ultraviolet lamp is by FPGA control centre connection control.

8. the fast automatic drying machine of the wetted umbrella based on FPGA according to claim 1, is characterized in that: in described cylinder, a circular inner ring is also fixed at middle part, and the diameter of circular inner ring is 2 ~ 4 times of umbrella.

9. the fast automatic drying machine of the wetted umbrella based on FPGA according to claim 1, is characterized in that: described first rotating shaft top is provided with trigger key, and described trigger key is connected to FPGA control centre.

10. the control method of the fast automatic drying machine of the wetted umbrella based on FPGA: it is characterized in that, described control method comprises step:

1) when there being umbrella to put into drying machine, trigger key is pushed up in umbrella leading section, and drying machine is started working, and FPGA control centre controls cover plate and cover successively closes;

2) moisture signal of humidity sensor collection separately on position, and be sent to FPGA control centre, FPGA control centre adopts RBF algorithm to calculate humidity weights in drying machine, and judges whether humidity weights are greater than the threshold value of setting;

3) if humidity weights are greater than the threshold value of setting, FPGA control centre controls servomotor and rotates with certain speed, controls hot air circulating system and pass into hot blast in drying machine, controls to produce impulse electric field between cover plate and disc, opens uviol lamp;

4) if humidity weights are less than the threshold value of setting, FPGA control centre controls to close servomotor, hot air circulating system, impulse electric field and uviol lamp, then controls to open cover plate and cover, terminates dry.