WO2009039729A1

WO2009039729A1 - A high accuracy coal weighing feeder

Info

Publication number: WO2009039729A1
Application number: PCT/CN2008/071002
Authority: WO
Inventors: Da LI; Fusheng He; Xingguo Zhang; Deqiang Zhang
Original assignee: Saimo Group Co., Ltd.
Priority date: 2007-09-28
Filing date: 2008-05-16
Publication date: 2009-04-02
Also published as: CN201137953Y

Abstract

A high accuracy coal weighing feeder is comprised of an input funnel (2), an output means (10), a feeder shell (5), a conveyor belt (4), a drawing strickle scavenging machine (9), a tacho-generator (11) and weighing means. The weighing means include three weighers(3,7,12) which are set below the conveyor belt (4), two weighers (3,7) are adjacently positioned upstream from the input funnel and one weigher (12) is positioned downstream from the input funnel. Each weigher has a check weights (8), a gas inlet valve (17) is set on the check weights and connected to a gas blow pipe (18). The three weighers (3,7,12) and the tacho-generator (11) are connected to an integrated metering device by signal cables. The present weighing means can realize automatic calibration, automatic comparison and the zero point continuously determined on line.

Description

High precision weighing coal feeder

Technical field

The utility model relates to a weighing coal feeder, in particular to a high-precision weighing coal feeder for coal feeding in a thermal power plant boiler. Background technique

The weighing coal feeder currently used, especially for weighing coal feeders for coal-fired power plant boilers, adopts a weighing structure of a set of weighing scales and a weighing instrument; Although the weighing structure of the form can meet the requirements of weighing, once the weighing scale is faulty, the coal feeder cannot be weighed and the accuracy of weighing can only be calibrated by means of physical verification or simulated load verification. The physical verification is limited by external conditions, and it is difficult to perform verification; the low confidence of the simulated load verification and the verification of both methods need to stop the material to be calibrated, so that the weighing of this structure is used. The low accuracy of the weighing machine and the poor running reliability have become prominent problems. Utility model content

technical problem:

The purpose of the utility model is to provide a high-precision weighing coal feeder with compact structure, on-line automatic comparison, automatic calibration, high accuracy and high reliability.

Technical solutions:

The high-precision weighing coal feeder of the utility model comprises a feeding port, a conveyor belt conveyor, a coal feeder casing, a scraper cleaning conveyor, a discharge port, a speed measuring sensor and a weighing device, and the conveying belt conveyor There are two sets of left and right adjacent weighing devices at the front of the feeding port, and a set of weighing devices are arranged at the rear of the feeding port; the calibration weights are set on the three sets of weighing devices, and the calibration weights are provided on the calibration weights. The gas valve and the air blowing pipe connected to the intake valve; the three sets of weighing devices are connected together by a signal cable to a centralized weighing instrument with a three-way weighing signal and a speed measuring signal input.

The weighing device adopts a full suspension structure composed of a load cell and a weighing roller, or a lever structure composed of an inner and outer frame and a heavy sensor; the weighing device is provided with a quick opening position. Inspection window; The weight calibration device comprises a standard weight and a weight bracket and a lever and cam for controlling the lifting and lowering of the standard weight. Beneficial effects:

The utility model has two weighing devices arranged adjacent to each other in front of the feeding port of the conveyor belt conveyor, and the weighing area is lengthened, so that the metering precision is greatly improved, and a tare weight is arranged behind the feeding port. The weighing device realizes online automatic zeroing and peeling. The three groups of weighing devices are connected by signal cable to a centralized weighing instrument with multi-way weighing signal input and one-way speed signal input. In the weighing process, the centralized weighing instrument collects the data collected by the two sets of coal weighing devices in front of the feeding port of the conveyor belt, so as to obtain the coal feeding amount with higher measurement accuracy; The device can perform automatic online comparison and automatic calibration, and the operation reliability is improved; the centralized control weighing instrument collects data from the weighing device behind the feeding port of the conveyor belt, realizes automatic zero adjustment and taring, and improves the system. Weighing accuracy. Through the data collection and processing of the three sets of weighing devices, the weighing accuracy and operational reliability of the weighing machine are greatly improved, and it has wide practicality. DRAWINGS

1 is a structural view of a high-precision weighing coal feeder of the present invention.

2 is an enlarged view of the structure of the coal weighing and weighing area of the high-precision weighing coal feeder of the present invention.

Fig. 3 is a cross-sectional view taken along line E-E of Fig. 1 of the high-precision weighing coal feeder of the present invention.

4 is an enlarged view showing a structure of a high-precision weight calibration portion of the present invention.

Symbol Description

1 Collective weighing instrument 2 Feed inlet

3 Weighing device 4 Conveyor belt conveyor

5 Feeder housing 6 Access window

7 Weighing device 8 Weight calibration device

9 Scraper cleaning conveyor 10 Outlet

11 speed sensor 12 weighing device

13 weight hanger 14 load cell

15 Weighing roller 16 Conveyor belt longitudinal beam

17 intake valve 18 blow pipe

19 Standard weight 20 lever

21 cam detailed description

The present invention will be further described below in conjunction with the embodiments in the drawings:

As shown in Figures 1 and 2, the weighing coal feeder of the utility model mainly comprises a centralized weighing instrument 1, three sets of weighing devices 3, 7, 12, a conveyor belt conveyor 4, and a coal feeder casing 5, The weight calibration device 8, the scraper cleaning conveyor 9 and the speed measuring sensor 11 are formed, the coal feeder casing 5 is cylindrical or polygonal, and the scraper cleaning conveyor 9 is a chain drive, which is disposed in the coal feeder casing 5. In the inner bottom portion, the conveyor belt conveyor 4 is disposed inside the coal feeder casing 5, the right side upper portion of the coal machine casing 5 is provided with a feed port 2, and the left lower portion thereof is provided with a discharge port 10. The three sets of weighing devices 3, 7, and 12 are identical, and the structure may be a full suspension direct force transmission structure or a lever type force transmission structure, and disposed under the upper belt of the endless belt of the conveyor belt conveyor 4, two of which The group weighing devices 3, 7 are arranged adjacent to the front of the feeding port 2 of the conveyor belt 4, and the other group of weighing devices 12 are arranged at the rear of the feeding port 2, and the sides of the coal feeder casing 5 are provided. There is an access window 6 for facilitating the inspection of the weighing devices 3, 7, 12, and the speed measuring sensor 11 is provided at the rear of the coal feeder housing 5. The three sets of weighing devices 3, 7, and 12 are respectively provided with two load cells 14 and one weighing roller 15, and one ends of the two load cells 14 are respectively fixed on the longitudinal beam 16 of the conveyor belt, and the other ends are respectively fixed. One end of the weigh roller 15 is provided, and the weighing device 3, 7, 12 is provided with a weight calibration device 8, and the weight calibration device 8 is provided with an intake valve 17 and a blow pipe 18 connected to the intake valve 17, which is compressed. The air blows off the dust on the standard weight 19 through the intake valve 17 and the blow pipe 18 to eliminate the influence of dust on the weight accuracy, as shown in FIG. The weight calibration device 8 is disposed under the weighing device 3, 7 or 12, and is composed of a standard weight 19 and a weight bracket 13 and a lever 20 and a cam 21 for controlling the lifting and lowering of the standard weight 19, as shown in FIG. Show. At the timing, the cam 21 rotates and lowers the lever 20, and the standard weight 19 is placed in the V-shaped groove of the weight bracket 13, and the symmetric weight device 3, 7 or 12 is loaded for calibration; after the calibration is completed, the cam 21 is reversely rotated. With the lever 20, the standard weight 19 is disengaged from the V-groove of the weight carrier 13, and the weight 19 is no longer loaded by the symmetrical weight device 3, 7 or 12. The load cell 14 and the speed sensor 11 are connected to the centralized weighing instrument through a signal cable. The centralized weighing instrument 1 can share the signal of one speed sensor.

Working principle: In the coal feeding process of the coal feeder, the weighing device 3 and 7 respectively transmit the measured coal feeding amount data to the centralized weighing instrument 1 via the signal cable, and the centralized weighing instrument 1 combines the measured data. The treatment is carried out to obtain a total amount of coal fed. As the two sets of weighing devices are measured together, the length of the weighing section is lengthened to increase the metering accuracy of the entire scale. The centralized weighing instrument 1 combines the measured data and processes the output signals of the load cells 14 in the 3 and 7 sets of weighing devices, respectively. If one of the load cell output signals of one of the weighing devices deviates too far from the other load cell output signals, the centralized weighing instrument 1 will judge that the group of weighing devices may malfunction, and only select another group. The output of the heavy device is weighed to ensure the reliability of the system operation. The weighing device 12 installed behind the feeding port only measures the belt tare weight, and sends the measured tare signal to the centralized weighing instrument 1 for processing, which can realize automatic on-line peeling of the coal feeder in the coal feeding weighing process. The measurement accuracy of the system is improved; the weighing devices 3 and 7 installed in front of the lowering port can be automatically aligned online by means of mutual comparison. Firstly, the two weighing devices are separately weighed, the weighing results of the two weighing devices are equalized by calibration, and then a set of weighing devices are selected in the coal feeding process of the coal feeder, and the weighing device is applied on the weighing device. Standard weight, at this time the two sets of weighing devices get two sets of weighing data, a set of weighing devices applying standard weights get the combined data of the measured material weight and the weight of the weight, and the other group does not apply the standard. A set of weighing devices for the code only obtains data for measuring the weight of the material. Since the two sets of weighing devices have been calibrated, the obtained results of measuring the weight of the materials are the same, the data obtained by the two sets of weighing devices are subtracted, and finally only the weighing data obtained by applying the standard weights is obtained, thereby completing the automatic calibration of the re-line.

Claims

Claim

1. A high-precision weighing coal feeder, including a feed port (2), a conveyor belt conveyor (4), a coal feeder casing (5), a scraper cleaning conveyor (9), and a discharge port (10) The speed sensor (11) and the weighing device are characterized in that: two sets of left and right adjacent weighing devices (3, 7) are arranged at the front of the feeding port (2) of the conveyor belt conveyor (4). A feeding device (12) is arranged at the rear of the feeding port (2); a calibration weight (8) is provided on each of the three weighing devices, and an intake valve (17) is provided on the calibration weight (8) And the air blowing pipe (18) connected to the intake valve (17); the three sets of weighing devices (3, 7, 12) are connected by signal cable to a centralized control system with three-way weighing signal and one-way speed signal input. Heavy instrument (1).

2. The high-precision weighing coal feeder according to claim 1, wherein: said weighing device (3, 7, 12) is composed of a load cell (14) and a weighing roller (15). Fully suspended structure, or a lever structure with internal and external frames and heavy sensors (14).

3. The high-precision weighing coal feeder according to claim 1 or 2, characterized in that: the weighing device (3, 7, 12) is provided with a quick-opening inspection window (6) at the position.

4. The high-precision weighing coal feeder according to claim 1, wherein: said weight calibration device (8) is controlled by a standard weight (19) and a weight bracket (13) Standard weight (19) Lifting lever (20) and cam (21).