CN2058748U

CN2058748U - High-accuracy automatic weigher for bulk material

Info

Publication number: CN2058748U
Application number: CN 89209831
Authority: CN
Inventors: 杨明; 王黎; 沈有德
Original assignee: 沈有德
Current assignee: Shen Youde
Priority date: 1989-08-05
Filing date: 1989-08-05
Publication date: 1990-06-27

Abstract

The utility model relates to a high-accuracy automatic weigher for bulk materials, which adopts the weighing mode of a charging hopper being suspended. The high-accuracy automatic weigher for bulk materials is composed of a feeding door, a discharging door, a weighing hopper, a sensor, an electromagnetic valve, a computer controlled system, etc. The automatic control of feeding, weighing and discharging is realized by a weighing single closed-loop automatic control system; the high-accuracy automatic weigher for bulk materials can carry out the nonlinearity correction of data, the automatic temperature compensation and the digital filtering. The utility model has the advantages of high metering precision, high speed, simple operation, complete functions, etc. The high-accuracy automatic weigher for bulk materials can enhance the work efficiency for 3-5 times than the same type of weighing devices, and can enhance the precision for 2-3 times. The high-accuracy automatic weigher for bulk materials can be suitable for weighing any bulk materials such as cereals, cements, chemical fertilizers, etc.).

Description

High-accuracy automatic weigher for bulk material

The utility model is a kind of computer-controlled loose unpacked material automatic weighing device.

At present, for weighing of the loose unpacked material of continuous conveying (as the computation weigh of rice factory paddy and rice, grain shop sells rice and weighs), the lever type mechanical weighing device that adopts electrical equipment control mostly or manually control, its shortcoming is that precision is lower, speed is slow, labour intensity is big.

The purpose of this utility model to provide a kind of exactly and can weigh automatically, can control automatically again charging and discharging, high precision, multi-functional, can be applicable to loose unpacked material metering, packing, especially be applicable to the automatic weighing device of loose unpacked material retail.

The utility model adopts hopper to hang the weighing mode.Bucket is suspended on the pull-type sensor, and sensor is connected with computer control system by the shielded multiconductor cable line, is respectively arranged with solenoid valve at the charging aperture and the discharging opening of this weighing device.Computer control system collects the signal of sensor, treatedly controls charging and discharging effectively by solenoid valve control circuit, forms high-precision weighing list closed loop automatic control system, thereby realizes full-automation that the loose unpacked material of continuous output is weighed.

Below in conjunction with description of drawings the utility model is explained:

Accompanying drawing 1,2 is a structural representation of the present utility model, and wherein Fig. 1 is a front elevation, and Fig. 2 is a left view.

Accompanying drawing 3 is metering and control circuit block scheme.

Accompanying drawing 4 is the control circuit schematic diagram.

Shown in accompanying drawing 1,2, the utility model mainly is made up of support ［ 1 ］, discharge bucket ［ 2 ］, discharge door ［ 3 ］, bucket ［ 5 ］, big feeding gate ［ 11 ］, little feeding gate ［ 12 ］, swivel ［ 6 ］ etc., and bucket ［ 5 ］ is suspended on the hook of support by swivel ［ 6 ］.The outstanding characteristics of the utility model are between bucket ［ 5 ］, swivel ［ 6 ］ pulling force sensor ［ 10 ］ to be housed, and it links to each other with computer control system by shielded multiconductor cable line ［ 9 ］.Discharging solenoid valve ［ 4 ］ is housed on discharge door ［ 3 ］, on big feeding gate ［ 11 ］, little feeding gate ［ 12 ］ big charging solenoid valve ［ 8 ］ and little charging solenoid valve ［ 7 ］ is housed respectively, they link to each other with computer control system respectively.Shown in accompanying drawing 3, described computer control system has mainly comprised second amplifying circuit ［ 13 ］, analog switch ［ 14 ］, A/D converter ［ 15 ］, 8031 microcontroller systems ［ 16 ］, driving circuit ［ 17 ］.

Shown in Fig. 1,2, discharge bucket in the utility model ［ 2 ］ is to be fixed on the support ［ 1 ］, the outlet of bucket is connected mutually with the discharging quarrel, but keep contactless state between discharge bucket ［ 2 ］ and the bucket ［ 5 ］, and bucket adopts universal bascule to be connected with support by a sensor, can make that pull-type sensor is stressed to remain on the same straight line with the bucket center of gravity, can guarantee that sensor is subjected to vertical tension, avoid uneven loading error, reduced the influence of mechanical part again acquisition system.In the utility model, a preamplifying circuit also has been installed in the described sensor ［ 10 ］, the second amplifying circuit ［ 13 ］ of it and computer control system, join (referring to accompanying drawing 3), signal is sent to control system after amplifying, improved signal to noise ratio (S/N ratio).

As shown in Figure 4, solenoid valve of the present utility model all adopts bidirectional triode thyristor control, its control termination photoresistance, computer control system keying of control electromagnetic valve by the control light emitting diode, its advantage is that forceful electric power and system are isolated, and has improved the interference free performance of system; Also be provided with temperature correction circuit ［ 18 ］ in computer control system, it is made up of Temperature Detector bridge diagram and amplifying circuit, and this can guarantee effectively that measuring accuracy is not affected because of temperature variation; Also be provided with power-off protecting circuit ［ 19 ］ in the control system of the present utility model, it is made up of 555 devices etc.

Total system software program of the present utility model is solidificated in the eprom memory, and it is made up of major parts such as automatic weighing program, manual weighing program, the statistics programs that adds up.The programming of employing building block technique has system of one's own enclosed construction by master routine.The course of work of the present utility model can be summarized as follows: after the operator was provided with a weighing value by keyboard, large and small feeding gate ［ 11 ］, ［ 12 ］ were opened in computer control solenoid valve ［ 8 ］, ［ 7 ］; Loose unpacked material enters bucket ［ 5 ］, the weight of material becomes voltage signal by the sensor transducing, mould/number (A/D) conversion after the amplification filtering, computing machine is signal period collection, calculating, processing to this, when the approaching setting of weight weighing value, big feeding gate ［ 11 ］ is closed in computer control, when weight of material reaches setting weighing value, close little feeding gate ［ 12 ］, computing machine carries out processing such as gamma correction, automatic temperature control, digital filtering in the whole process to image data, guarantees the precision and the reliability of system.Weighing finishes, and computer control discharging solenoid valve ［ 4 ］ is opened, discharging automatically.Its weighing value statistics that can add up, and deposit it in calculator memory.

The utlity model has simple to operate, automaticity is high, the advantage such as measuring accuracy height, working stability are reliable, multiple functional. Use this device can improve 2～3 times of measuring accuracies, improve 3～5 times of work efficiency, have significant social and economic benefits.

Claims

1, a kind of high precision loose unpacked material automatic weighing device, it is made up of support [1], discharge bucket [2], discharge door [3], bucket [5], big feeding gate [11], little feeding gate [12], swivel [6] etc., and bucket [5] is suspended on the hook of support by swivel [6].Of the present utility model being characterised in that between bucket [5] and swivel [6] is equipped with a pulling force sensor [10], it links to each other with computer control system by shielded multiconductor cable line [9], discharging solenoid valve [4] is housed on discharge door [3], at big feeding gate [11], the little charging solenoid valve of big charging solenoid valve [8] [7] is housed respectively on the little feeding gate [12], they link to each other with computer control system respectively, and described computer control system comprises second amplifying circuit [13], analog switch [14], A/D converter [15], 8031 microcontroller systems [16] and driving circuit [17].

2, high precision loose unpacked material automatic weighing device according to claim 1 is characterized in that discharge bucket ［ 2 ］ is fixed on the support ［ 1 ］, and the bucket outlet is connected mutually with the discharging quarrel, but discharge bucket ［ 2 ］ is in contactless state with bucket ［ 5 ］.

3, high precision loose unpacked material automatic weighing device according to claim 2 is characterized in that having installed in the sensor ［ 10 ］ preamplifying circuit, and the second amplifying circuit ［ 13 ］ in it and the computer control system joins.

4, high precision loose unpacked material automatic weighing device according to claim 3, it is characterized in that described solenoid valve ［ 4 ］, ［ 7 ］, ［ 8 ］ all adopt bidirectional triode thyristor control, its control termination photoresistance, computer control system keying of control electromagnetic valve by the control light emitting diode.

5, high precision loose unpacked material automatic weighing device according to claim 4 is characterized in that being provided with power-off protecting circuit ［ 19 ］ in computer system, and it is made up of 555 devices.