CN106436179A - Weighing method of industrial roller washing machine - Google Patents

Abstract

The invention provides a weighing method of an industrial drum washing machine, and the drum washing machine uses an industrial front drum washing machine. The specific method is as follows: start the power supply, the motor controls the acceleration of the drum of the washing machine, after the drum speed is slightly greater than the fixed speed n ₂ , turn off the driving motor, and measure the rotation of the drum during the process of the drum falling from the fixed speed n ₂ to another fixed speed n ₁ in a free state Angle θ; measure θ under different clothing weights m, obtain multiple sets of data, establish m-θ correspondence, and use the least square method to fit the m=f(θ) curve according to the corresponding table; when measuring, measure θ, Substituting m=f(θ) into the relational expression, and calculating the clothes weight m with the microprocessor. The method of the invention has high weighing speed, high precision, low cost, simple structure, intelligent operation can be realized by software, and convenient use.

Description

Weighing method of industrial drum washing machine

technical field

The invention relates to a laundry weighing method for an industrial drum washing machine.

Background technique

Industrial washing machines are mainly drum washing machines, which are common, simple, and easy-to-maintain washing equipment, suitable for washing all kinds of clothes and fabrics, and are widely used in laundry rooms such as garment factories, washing factories, hotels, and hospitals.

According to the current development direction, the washing machine is developing towards a more energy-saving, environmentally friendly and intelligent direction. Among them, intelligent weighing is a very important direction. It can not only save water and improve efficiency, but more importantly, prevent the drum washing machine from overloading by weighing clothes. The current industrial washing machine has an automatic weighing function, many of which are completed by complex sensors, with high cost and complicated structure.

On November 11, 2009, Chinese utility model patent CN200810094132.X disclosed an automatic weighing method for a drum washing machine, which makes the motor rotate at a constant speed at the first predetermined speed, measures the electric energy of the load driven by the motor at this time, and then measures the motor from The rising electric energy when the first predetermined rotating speed rises to the second predetermined rotating speed, the electric energy of the load obtained by multiplying the electric energy of the constant speed rotation by the electric energy of the rising electric energy multiplied by the time correction parameter, and the electric energy of the load stored in the computer controller of the washing machine and the load electric energy The weight correspondence curves are compared to determine the most similar weight data. This method is complicated to measure electric energy, and the measurement error of clothing weight is relatively large under the condition of total voltage fluctuations such as power consumption peaks.

On July 16, 2014, Chinese utility model patent CN201310013011.9 announced a method and device for weighing clothes in a washing machine, which calculates the transient conduction angle when the motor is rotating, and according to the transient conduction angle of the motor and the power supply of the motor The characteristic curve of the signal, calculate the transient power consumed by the motor, and integrate and sum the transient power consumed by the motor to obtain the work done by the motor on the clothes. According to the corresponding relationship between the size of the work and the weight of the clothes, find out the The work done corresponds to the weight of the laundry. This method requires complex circuit design and precise inductance components, which greatly increases the cost. At the same time, the motor power supply is affected by the working environment and has a large error.

Contents of the invention

The object of the present invention is to design a laundry weighing method for an industrial washing machine realized by using a magnetoelectric speed sensor and a certain calculation method, which can solve the problems of short service life caused by overloading of the drum washing machine.

The present invention is based on the industrial drum washing machine, and the device comprises: a pulley, on which 8 through holes of equal size and evenly distributed are punched; a magnetoelectric speed sensor is installed directly in the center of the round hole of the pulley, and is used to detect the speed and speed of the pulley. Turning angle; the microprocessor is used to receive the signal transmitted by the magnetoelectric speed sensor, process it, convert it into speed and angle, and perform calculations to obtain the weight of the clothes, and at the same time control the working status of the washing machine; the display screen shows the clothes resuming process;

The specific method is: start the power supply, the motor controls the acceleration of the drum of the washing machine, after the drum speed is slightly greater than the fixed speed n ₂ , turn off the driving motor, and measure the rotation speed of the drum during the process of the drum falling from the fixed speed n ₂ to another fixed speed n ₁ in a free state Angle θ; measure θ under different clothes weight m, obtain multiple sets of data, establish m-θ correspondence, and use the least square method to fit the m=f(θ) curve according to the corresponding table; when measuring, measure θ, Substituting m=f(θ) into the relational expression, and calculating the clothes weight m with the microprocessor.

Among them, the fitting method of the least square method is as follows:

The table shows several sets of data measured in the experiment:

Clothing weight m m ₁ m ₂ ... m _n-1 m _n Rotation angle θ θ ₁ θ ₂ ... θ θ

Let m=a ₀ +a ₁ θ+a ₂ θ ² +a ₃ θ ³ +…+a _k θ ^k (k<<n)

it satisfies Get the minimum value, that is:

Solve the values of a ₀ , a ₁ , a ₂ ... a _k , and substitute them into the original formula to obtain the relational formula of m=f(θ);

Among them, the speed and the number of rotations are measured by the magnetoelectric speed sensor. The rotation of the drum drives the pulley to rotate. Every time the pulley rotates 45°, the magnetoelectric speed sensor generates a pulse, the drum rotates, and the microprocessor receives the pulse. Δt counts the number m of pulses received within Δt once (here Δt=0.1s can be taken)

When speeding up, when the first It is considered that the speed at this time is n ₁ ,

When decelerating, when the first It is considered that the speed at this time is n ₂ ,

Assuming that the drum decreases from the speed n ₂ to the speed n ₁ in an uncharged free state, the angle turned during the period is θ _n2→n1 , and the number of pulses experienced during the period is N _n2→n1 , then: θ _n2→n1 ＝N _{n2→ n1} ×45°;

The method of the invention weighs the clothes, the process is fast, the method is simple, the cost is low, and the measurement is accurate.

Description of drawings

Figure 1, layout diagram of pulley and sensor of drum washing machine;

Fig. 2, flow chart of the present invention;

detailed description

First, program the microprocessor so that it has the function of measuring the speed and the number of rotations mentioned above, and can turn on and off the motor according to the set program, and at the same time display parameters such as the weight of the clothes on the display;

As in the process shown in Figure 1, turn on the power supply, and after the program starts, the motor controls the acceleration of the drum of the washing machine. After the drum speed is slightly greater than the fixed speed n ₂ , turn off the drive motor, and the measuring drum drops from the fixed speed n ₂ to another fixed speed n ₁ in a free state. The angle θ that the drum rotates during the process; according to the m=f(θ) relationship obtained from many experiments, substitute θ to calculate the clothes weight m.

Claims (4)

1. A weighing method for an industrial drum washing machine, characterized in that: after the washing machine is started, the motor controls the drum of the washing machine to accelerate, and after the drum speed is slightly greater than the fixed speed _n2 , the drive motor is turned off, and the measuring drum descends from the fixed speed _n2 in a free state The angle θ that the drum rotates during the process of reaching another constant speed n ₁ ; according to the formula and J ₁ =m·r _i ² to measure θ under different clothes weight m, obtain multiple sets of data, and establish m-θ correspondence Clothing weight m m ₁ m ₂ ... m _n-1 m _n Rotation angle θ θ ₁ θ ₂ ... θ θ Fit the m=f(θ) curve with the least squares method according to the corresponding table; during measurement, measure θ, substitute into the m=f(θ) function, and obtain the clothing weight m. 2. The weighing method of industrial front-loading washing machine according to claim 1, characterized in that: the rotation speed n and the angle of rotation θ of the drum are all measured by a magnetoelectric speed sensor, and the rotation of the drum drives the pulley to rotate, and the pulley rotates every 45 °, the magnetoelectric speed sensor generates a pulse, the drum rotates, the microprocessor receives the pulse, and counts the pulse number m received in the Δt time every Δt time (here, Δt=0.1s can be taken), that is When speeding up, when the first It is considered that the speed at this time is n ₁ , When decelerating, when the first It is considered that the speed at this time is n ₂ , Assuming that the drum decreases from the speed n ₂ to the speed n ₁ in an uncharged free state, the angle turned during the period is θ _n2→n1 , and the number of pulses experienced during the period is N _n2→n1 , then: θ _n2→n1 ＝N _{n2→ n1} ×45°. 3. The weighing method of the industrial drum washing machine according to claim 1, characterized in that: the selected constant speeds _n1 and _n2 are large enough, when the drum speed is between _n1 and _n2 , it meets the requirement of drum underwear The material can be close to the wall of the bucket to avoid J ₁ from changing continuously in the same measurement, and the speed can be n ₁ =300rpm, n ₂ =900rpm. 4. The weighing method of industrial drum washing machine according to claim 1, characterized in that: 8 through holes of equal size and evenly distributed around are punched on the pulley connected to the drum; The center of the round hole is used to detect the speed and angle of the pulley; the microprocessor is used to receive the signal transmitted by the magnetoelectric speed sensor, process it, convert it into speed and angle, and perform calculations to obtain the weight of the clothes. At the same time control the working status of the washing machine; the display screen shows the weight and progress of the clothes.