CN202195868U

CN202195868U - Powder dynamic weighing instrument

Info

Publication number: CN202195868U
Application number: CN 201120299361
Authority: CN
Inventors: 袁庆丹; 梁燕飞; 肖燕平
Original assignee: Foshan University
Current assignee: Foshan University
Priority date: 2011-08-17
Filing date: 2011-08-17
Publication date: 2012-04-18
Anticipated expiration: 2021-08-17

Abstract

A powder dynamic weighing instrument is characterized by comprising a raw material conveying mechanism, a storage tank connected with the raw material conveying mechanism, a gauge box located at the outlet position at the lower end of the storage tank, a weighing sensor arranged on the gauge box and a microcomputer control device. A flow velocity baffle driven by a stepping motor is arranged at the outlet position at the lower end of the gauge box, a motor-driven discharge valve is arranged at the outlet at the lower end of the storage tank, a control electrical signal output of the microcomputer control device is respectively connected with a control electrical signal input of the raw material conveying mechanism, a control electrical signal input of the motor-driven discharge valve and a control electrical signal input of the stepping motor, and an electrical signal output of the weighing sensor is connected with an electrical signal input of the microcomputer control device. Compared with the prior art, the powder dynamic weighing instrument can automatically control feeding and feed supplement of powder, a measuring structure is relative simple, measurement accuracy is high, and powder dynamic weighing instrument is convenient in operation and meets actual requirements of powder pneumatic transmission, has strong generality and portability, can be combined with automatic control and instrument networking technology, and further achieves intellectualization and networking.

Description

A kind of powder dynamic weighing instrument

Technical field

The utility model relates to a kind of weighing device.

Background technology

In rubber production, fine chemistry industry, coating material production industry, often need solid powder be joined in batching still, agitated reactor and the spice equipment.In these industries, majority still adopts artificial weighing and burden at present, situation such as owing to there is the residual and operator's of the powder of carrier wall misoperation, cause that the raw material mixing ratio is inaccurate, unstable product quality, qualification rate are low.

In order to change this situation, press for a kind of device that can weigh automatically and control powder.The powder weighing instrument of present domestic minority manufacturers produce, the ubiquity measuring accuracy is not high, static weighing, can't remote measurement and control, shortcoming such as cost an arm and a leg, so market share is not high, range of application is narrow.

Summary of the invention

The goal of the invention of the utility model is feed and the feed supplement that can control powder automatically through a kind of; Measurement structure is simple relatively, measuring accuracy is high, easy to operate, has satisfied the actual needs that the powder strength is carried; Have very strong versatility and portability, can combine control and instrument networking technology automatically, further realize powder dynamic weighing instrument intelligent and networking.

The utility model is to realize like this; Comprise ingredient conveyor structure, the storage tank that links to each other with the ingredient conveyor structure, the batch box that is positioned at exit, storage tank lower end, be arranged on LOAD CELLS, micro-computer controlling apparatus on the batch box; Be provided with the flow velocity baffle plate that drives by stepper motor in the exit of batch box lower end; The outlet of storage tank lower end is provided with electronic discharge valve; The control electric signal output of micro-computer controlling apparatus links to each other with the input of control electric signal, the input of Stepping Motor Control electric signal of the control electric signal input of ingredient conveyor structure, electronic discharge valve respectively, and the electric signal output of LOAD CELLS links to each other with the electric signal input of micro-computer controlling apparatus.LOAD CELLS is the semi-girder resistance strain plate, and 4 is one group, forms the electric bridge form.The ingredient conveyor structure comprises roots blower, Pneumatic conveying pipeline.During work, powder transmits in Pneumatic conveying pipeline under the effect of roots blower, stores in the storage tank.After the batching beginning, the electronic discharge valve of storage tank lower end outlet is opened in micro-computer controlling apparatus control.Wait for a period of time, after the batch box powder reaches certain value, close electronic discharge valve.After the changes in resistance amount that the weighing instrument of micro-computer controlling apparatus sends LOAD CELLS converts voltage to, after amplification, phase sensitive detection, filtering, AD conversion, microprocessor records gravimetric value at this moment.The control step motor is opened the flow velocity baffle plate to maximum angle simultaneously.In feeder process, the microprocessor of micro-computer controlling apparatus constantly compares the reduction of powder weight with the feed amount that is provided with, constantly reduce the folding angle of flow velocity baffle plate.Adopt related algorithm, calculate the weightless trend of powder, obtain the time that reaches appointment feed weight, stop feed, simultaneously error is analyzed and compensated in the only moment.When the powder of batch box reduced to certain value, blower fan was opened in weighing instrument control, replenishes powder to storage tank.The weighing instrument of micro-computer controlling apparatus can carry out the parameter setting and show real-time powder weight; And communicate through the RS485 serial line interface and the computing machine 5 of micro-computer controlling apparatus; All data can show on the software for calculation interface that the user also can implement control to the powder course of conveying through computing machine.

Therefore the utility model, has feed and the feed supplement that can control powder automatically owing to adopt dynamic weighing and combine microcomputerized control; Measurement structure is simple relatively, measuring accuracy is high, easy to operate, has satisfied the actual needs that the powder strength is carried; Have very strong versatility and portability, can combine control and instrument networking technology automatically, further realize advantage intelligent and networking.

Description of drawings:

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

Fig. 2 is the control principle figure of the utility model.

Embodiment:

Combine accompanying drawing and embodiment that the utility model is done describes in further detail at present:

As shown in the figure; The utility model comprises ingredient conveyor structure, the storage tank 3 that links to each other with the ingredient conveyor structure, the batch box 11 that is positioned at exit, storage tank 3 lower end that are made up of roots blower 1, Pneumatic conveying pipeline 2, is arranged on LOAD CELLS 8, micro-computer controlling apparatus on the batch box 11; Micro-computer controlling apparatus comprises powder dynamic weighing instrument 4, subscriber computer 5; Be provided with the flow velocity baffle plate 10 that drives by stepper motor 7 in the exit of batch box 11 lower ends; The outlet of storage tank 3 lower ends is provided with electronic discharge valve 9; The output of the control electric signal of the subscriber computer 5 of micro-computer controlling apparatus links to each other with the control electric signal input of the roots blower 1 of ingredient conveyor structure, the control electric signal input of electronic discharge valve 9, the control electric signal input of stepper motor 7 respectively, and the electric signal output of LOAD CELLS 8 links to each other with the electric signal input of the powder dynamic weighing instrument 4 of micro-computer controlling apparatus.LOAD CELLS 8 is the semi-girder resistance strain plate, and 4 is one group, forms the electric bridge form.

Here; Powder dynamic weighing instrument 4 comprises that little process chip 41, storage chip 42, low-pass filter circuit 43, phase-sensitive detection circuit 44, amplifying circuit 45, blower fan control output 46, flow velocity baffle controls output 47, discharge valve control output 48, photoelectric isolation module 49, power module 410, keyboard input circuit 411, LED show output 412, RS485 serial communication interface 413; The electric signal output of LOAD CELLS 8 links to each other with little process chip 41 through amplifying circuit 45, phase-sensitive detection circuit 44, low-pass filter circuit 43; Little process chip 41 links to each other with blower fan control output 46, flow velocity baffle controls output 47, discharge valve control output 48 respectively through photoelectric isolation module 49; Storage chip 42, RS485 serial communication interface 413 and little 41 two-way linking to each other of process chip, keyboard input circuit 411, LED show that output 412 links to each other with little process chip 41 respectively.

Claims

1. powder dynamic weighing instrument; It is characterized in that comprising ingredient conveyor structure, the storage tank that links to each other with the ingredient conveyor structure, the batch box that is positioned at exit, storage tank lower end, be arranged on LOAD CELLS, micro-computer controlling apparatus on the batch box; Be provided with the flow velocity baffle plate that drives by stepper motor in the exit of batch box lower end; The outlet of storage tank lower end is provided with electronic discharge valve; The control electric signal output of micro-computer controlling apparatus links to each other with the input of control electric signal, the input of Stepping Motor Control electric signal of the control electric signal input of ingredient conveyor structure, electronic discharge valve respectively, and the electric signal output of LOAD CELLS links to each other with the electric signal input of micro-computer controlling apparatus.

2. powder dynamic weighing instrument according to claim 1 is characterized in that LOAD CELLS is the semi-girder resistance strain plate, and 4 is one group, forms the electric bridge form.

3. powder dynamic weighing instrument according to claim 2 is characterized in that the ingredient conveyor structure comprises roots blower, Pneumatic conveying pipeline.

4. according to claim 1 or 2 or 3 described powder dynamic weighing instruments; It is characterized in that micro-computer controlling apparatus comprises subscriber computer; The powder dynamic weighing instrument comprises that little process chip, storage chip, low-pass filter circuit, phase-sensitive detection circuit, amplifying circuit, blower fan control output, the output of flow velocity baffle controls, discharge valve control output, photoelectric isolation module, power module, keyboard input circuit, LED show output, RS485 serial communication interface; The electric signal output of LOAD CELLS links to each other with little process chip through amplifying circuit, phase-sensitive detection circuit, low-pass filter circuit; Little process chip links to each other with blower fan control output, the output of flow velocity baffle controls, discharge valve control output respectively through photoelectric isolation module; Storage chip, RS485 serial communication interface and little process chip is two-way links to each other; Keyboard input circuit, LED show that output links to each other with little process chip respectively, and subscriber computer is connected on the RS485 serial communication interface.