CN202195868U - Powder dynamic weighing instrument - Google Patents

Abstract

A powder dynamic weighing instrument, characterized in that it comprises a raw material conveying mechanism, a storage tank connected to the raw material conveying mechanism, a measuring hopper located at the outlet of the lower end of the storage tank, a weighing sensor arranged on the measuring hopper, a microcomputer control The device is equipped with a flow rate baffle driven by a stepping motor at the outlet of the lower end of the measuring bucket, and an electric unloading valve is installed at the outlet of the lower end of the storage tank. The input, the control electric signal input of the electric unloading valve, and the control electric signal input of the stepping motor are connected, and the electric signal output of the weighing sensor is connected with the electric signal input of the microcomputer control device. Compared with the prior art, the utility model has the ability to automatically control the feeding and replenishing of powder materials; the measurement structure is relatively simple, the measurement accuracy is high, and the operation is convenient, which meets the actual needs of powder material pneumatic conveying; and portability, it can be combined with automatic control and instrument networking technology to further realize the advantages of intelligence and networking.

Description

A powder dynamic weighing instrument

technical field

The utility model relates to a weighing device. the

Background technique

In the rubber production, fine chemical industry, and paint production industries, it is often necessary to add solid powder to batching kettles, reaction kettles and mixing equipment. At present, most of these industries still use manual weighing and batching. Due to the powder residue on the wall of the conveying pipe and the operator's misoperation, the mixing ratio of raw materials is inaccurate, the product quality is unstable, and the pass rate is low. the

In order to change this situation, there is an urgent need for a device that can automatically weigh and control the powder. At present, the powder weighing instruments produced by a few domestic manufacturers generally have shortcomings such as low measurement accuracy, static measurement, inability to remote measurement and control, and high price, so the market share is not high and the application range is narrow. the

Contents of the invention

The purpose of the invention of this utility model is to meet the actual needs of powder pneumatic conveying through a kind of automatic control of powder feeding and feeding; the measurement structure is relatively simple, the measurement accuracy is high, and the operation is convenient; it has strong versatility And portability, it can be combined with automatic control and instrument networking technology to further realize the intelligent and networked powder dynamic weighing instrument. the

The utility model is realized in this way, including a raw material conveying mechanism, a storage tank connected with the raw material conveying mechanism, a measuring hopper located at the outlet of the lower end of the storage tank, a weighing sensor arranged on the measuring hopper, and a microcomputer control device. The outlet at the lower end of the bucket is provided with a flow rate baffle driven by a stepping motor, and the outlet at the lower end of the storage tank is provided with an electric unloading valve. The control electric signal input of the material valve is connected with the control electric signal input of the stepping motor, and the electric signal output of the weighing sensor is connected with the electric signal input of the microcomputer control device. The load cell is a cantilever beam resistive strain gauge, 4 as a group, forming a bridge form. The raw material conveying mechanism includes Roots blower and pneumatic conveying pipeline. When working, the powder is transported in the pneumatic conveying pipeline under the action of the Roots blower and stored in the storage tank. After batching starts, the microcomputer control device controls to open the electric unloading valve at the outlet of the lower end of the storage tank. After waiting for a period of time, when the powder in the weighing hopper reaches a certain value, close the electric discharge valve. The weighing instrument of the microcomputer control device converts the change of resistance transmitted by the load cell into a voltage, and after amplification, phase-sensitive detection, filtering, and AD conversion, the microprocessor records the weight value at this time. At the same time, the stepper motor is controlled to open the flow rate baffle to the maximum angle. During the feeding process, the microprocessor of the microcomputer control device continuously compares the reduction in powder weight with the set feeding amount, and continuously reduces the opening and closing angle of the flow rate baffle. Use relevant algorithms to calculate the trend of powder weight loss, find out the time to reach the specified feeding weight, stop feeding at the most appropriate time, and analyze and compensate the error at the same time. When the powder in the measuring hopper is reduced to a certain value, the weighing instrument controls to turn on the fan to replenish the powder to the storage tank. The weighing instrument of the microcomputer control device can set parameters and display the real-time powder weight, and communicate with the computer 5 through the RS485 serial interface of the microcomputer control device. All data can be displayed on the calculation software interface, and the user can also use the computer to Control the powder conveying process. the

Because the utility model adopts dynamic weighing and combined with microcomputer control, it has the ability to automatically control the feeding and replenishing of powder materials; the measurement structure is relatively simple, the measurement accuracy is high, and the operation is convenient, which meets the actual needs of pneumatic conveying of powder materials; It has strong versatility and portability, and can be combined with automatic control and instrument networking technology to further realize the advantages of intelligence and networking. the

Description of drawings:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the control schematic diagram of the utility model.

Detailed ways:

Now in conjunction with accompanying drawing and embodiment the utility model is described in further detail:

As shown in the figure, the utility model includes a raw material conveying mechanism composed of a Roots blower 1 and a pneumatic conveying pipeline 2, a storage tank 3 connected to the raw material conveying mechanism, a measuring bucket 11 located at the outlet of the lower end of the storage tank 3, a set The weighing sensor 8 on the measuring hopper 11, the microcomputer control device, the microcomputer control device includes a powder material dynamic weighing instrument 4, a user computer 5, and a flow speed stop driven by a stepping motor 7 is arranged at the outlet of the measuring hopper 11 lower end. Plate 10, the outlet of the lower end of the storage tank 3 is provided with an electric discharge valve 9, the control electric signal output of the user computer 5 of the microcomputer control device is respectively connected with the control electric signal input of the Roots blower 1 of the raw material conveying mechanism, and the electric discharge valve 9 The control electrical signal input of the stepper motor 7 is connected to the control electrical signal input, and the electrical signal output of the load cell 8 is connected to the electrical signal input of the powder material dynamic weighing instrument 4 of the microcomputer control device. The load cell 8 is a cantilever beam resistive strain gauge, 4 of which form a bridge form.

Here, the powder dynamic weighing instrument 4 includes a micro-processing chip 41, a memory chip 42, a low-pass filter circuit 43, a phase-sensitive detection circuit 44, an amplifier circuit 45, a fan control output 46, a flow rate baffle control output 47, and a discharge valve. Control output 48, photoelectric isolation module 49, power supply module 410, keyboard input circuit 411, LED display output 412, RS485 serial communication interface 413, the electrical signal output of weighing sensor 8 passes through amplifying circuit 45, phase-sensitive detection circuit 44, low The filter circuit 43 is connected to the micro-processing chip 41, and the micro-processing chip 41 is connected to the fan control output 46, the flow rate baffle control output 47, and the discharge valve control output 48 respectively through the photoelectric isolation module 49, and the storage chip 42 and RS485 serial communication The interface 413 is bidirectionally connected to the microprocessing chip 41 , and the keyboard input circuit 411 and the LED display output 412 are respectively connected to the microprocessing chip 41 . the

Claims (4)

1. A powder dynamic weighing instrument, characterized in that it comprises a raw material conveying mechanism, a storage tank connected to the raw material conveying mechanism, a measuring hopper positioned at the outlet of the lower end of the material storage tank, a weighing sensor arranged on the measuring hopper, The microcomputer control device is equipped with a flow rate baffle driven by a stepping motor at the outlet of the lower end of the measuring bucket, and an electric unloading valve is installed at the outlet of the lower end of the storage tank. The electrical signal input, the control electrical signal input of the electric discharge valve, and the control electrical signal input of the stepping motor are connected, and the electrical signal output of the weighing sensor is connected with the electrical signal input of the microcomputer control device. 2. The powder dynamic weighing instrument according to claim 1, characterized in that the load cell is a cantilever beam resistive strain gauge, 4 of which form a bridge form. 3. The powder material dynamic weighing instrument according to claim 2, characterized in that the raw material conveying mechanism includes a Roots blower and a pneumatic conveying pipeline. 4. The powder dynamic weighing instrument according to claim 1, 2 or 3, characterized in that the microcomputer control device includes a user computer, and the powder dynamic weighing instrument includes a micro-processing chip, a memory chip, a low-pass filter circuit, a phase Sensitivity detection circuit, amplifying circuit, fan control output, flow rate baffle control output, discharge valve control output, photoelectric isolation module, power module, keyboard input circuit, LED display output, RS485 serial communication interface, electrical signal of weighing sensor The output is connected to the micro-processing chip through the amplification circuit, the phase-sensitive detection circuit, and the low-pass filter circuit. The serial communication interface is bidirectionally connected with the microprocessing chip, the keyboard input circuit and the LED display output are respectively connected with the microprocessing chip, and the user computer is connected with the RS485 serial communication interface.

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