The composition and working principle of weighing batching scale

Weighing batching scale structure

Weighing batching scaleGenerally by the weighing body, feeding mechanism, unloading mechanism, electronic control system of two major components.

Feeding mechanism:

The general charging mechanism uses cylinder arc door feeding, vibrating feeding, spiral feeding, impeller feeding, gas blowing and other forms. General production using sheet metal cold processing, the latest quality of the mechanism directly related to the measurement accuracy.

Unloading mechanism:

General unloading mechanism uses cylinder arc door unloading, vibrating unloading, spiral unloading, rotating feeder unloading or directly using gas (electric) valve unloading and other forms of discharging. The general production of the use of sheet metal cold processing or direct purchase of rotary feeder and pneumatic (electric) valve.

Weighing body:

The scale body most uses the metal material angle steel, the trough steel, the square and so on as the main material, after the welding, the polishing spurts the plastic or the spray painting and so on craft production completes, at the same time the main material also some uses the mixed soil mainly, the metal material supplement way produces.

Electronic control system:

The electric system is mainly composed of weighing unit and control unit. Weighing unit in most occasions using the weighing Sensor + controller + electrical components of the way to control, the way the quality of stability, debugging relatively complex, low cost, simple function. In addition, foreign and domestic some large companies often adopt a control method is: Weighing sensor + weighing transmitter +plc+ touch screen (industrial computer). The method is of excellent quality and stability, simple debugging, easy operation, rich function but high cost, so the control mode is the best choice for medium and large users.

Batching Scale Classification

Batching scale According to the structure can be divided into mechanical, electromechanical combination and computer electronic type 3 kinds;

Mechanical type

The weighing body is composed of a load-bearing hopper, a lever system and a metering device. Weighing will be transferred to the weight of the specified quality location, mechanical or manual feeding, unloading. This kind of batching scale structure is relatively simple, but the accuracy is low, the operation speed is slow.

Mechanical-Electrical combination

It is developed on the basis of mechanical batching scale. In addition to the hopper and lever, but also using the asymptotic switch, grating measuring head or force transducer, such as force conversion devices, the corresponding scale is called the size of disk, grating, sensor-type batching scale. Raster batching Scale (Fig 1) is a more commonly used mechanical-electrical combination scale, which is used as a power-electric converter, and the fixed value of each material level is set arbitrarily by the Dial Code plate, which gives the fixed value of fast and slow feeding respectively. When metering, the quality signal from the grating is continuously compared with the setting value, which controls fast and slow feeding action. This batching scale has the function of automatic starting, automatic unloading, automatic 0-bit jumping material and so on, and has higher accuracy. But the circuit design is more complicated.

Computer Electronic

Its formulation, feeding and discharging are all controlled by computer (Fig. 2). Besides the hopper, weighing sensor, precision amplifier, module/number converter, microcomputer, monitor, printer and execution system. The computer control system can control multiple batching scales and a blender, and can control the dry mixing and wet mixing time, can be formulated several to dozens of kinds of materials, can display the batching process and print each material name, quality, total quality, cycle time, formula, daily report, monthly report, etc. The computer electronic batching scale formula storage quantity is big, the ingredient variety is many, the speed is fast, the accuracy is high, may provide the software to be rich, the procedure revises conveniently, is the high degree of automation product.

Single Item

1. A metering scale is only equipped with one kind of material, and several weighing scales form a variety of physical batching systems.

2. The batching work is carried out at the same time, the batching speed is fast.

3. According to aniseed large scale small material small scale principle flexible configuration range, ingredients accurate

Multiple items

1. Several kinds of physics sequentially in a predetermined order into a metering bucket for the ingredients

2. Batching scale bucket is completed by one batching controller

3. Low production cost and compact structure

Weight reduction method weighing

1. Suitable for the material with bad fluidity, measure according to the actual elimination quantity

2. The scale cannot be too big, otherwise the precision may not be high

3. Can be directly modified in the original storage material

4. The weighing bucket is filled with the material first, the batching has the controller to open in discharging the valve, each discharge sets the weight the material, when detects the remaining material in the hopper reaches the line, starts the conveyor structure to the hopper to charge, directly to the upper limit value is to stop.

According to unloading mode is divided into: intermittent batching scale and continuous batching scale.

Batching Scale intermittent batching scale

When the measurement is completed, the batching controller starts the unloading mechanism to start discharging, after discharging, the Guambi unloading mechanism is started, the next batching is initiated, and the batching scale used in this process is called the clearance type scale.

Batching Scale continuous batching scale

System operation, through the electronic screw batching scale to carry out the measurement of the material, by the computer accounting instrument to receive the weight and speed signal processing after conversion to the cumulative value and instantaneous flow, and the cumulative value, instantaneous flow signal from RS-485 oral to the Industrial control machine (upper computer), The 4~20ma analog current signal is transmitted to the inverter, and then the frequency regulator is used to adjust the speed of the higher feeder. When the flow increases, lower the speed of the higher feeder, conversely improve the speed of the higher feeder, so that the flow of material and the cumulative amount of the period are kept within the set range, and then complete the measurement of materials and ingredients. The working principle diagram of the system is shown in Figure 1.

Working principle

The tape feeder will pass through the material on the belt, weighing the weight sensor under the weighing scale frame to determine the weight of the material on the belt, the digital speed sensor mounted on the tail drum or rotating device, continuously measuring the feeding speed, the pulse output of the speed sensor is proportional to the belt speed The speed signal and the weight signal are fed into the belt feeder controller ZJ-820, generating and displaying the cumulative/instantaneous flow. The feed controller compares the flow rate with the set flow rate, and the controller outputs the signal to control the speed of the inverter and realizes the requirement of the ration feeding. Can be set up by the upper PC computer parameters, and PLC to realize the automatic control system.