A static bias test device and sampling method for a belt mid-section sampling machine system

Abstract

This application discloses a static bias test device and sampling method for a belt conveyor sampling system, including a sampling workbench with a sampling head on one side. A drum motor is located at one end of the sampling workbench, and a wear-resistant soft material is placed inside the drum motor. Forward rotation of the drum motor extends the wear-resistant soft material along the sampling workbench and lays it flat on the workbench. Reverse rotation of the drum motor retracts the wear-resistant soft material along the workbench and winds it back into the drum motor. A coal sample holding part is provided on the wear-resistant soft material. After the coal sample is placed in the coal sample holding part, the drum motor drives the wear-resistant soft material to move horizontally, so that the coal sample holding part corresponds to the sampling head. The sampling head then collects the coal sample held in the coal sample holding part. This application improves upon the problem of inaccurate analytical results caused by poor representativeness of the reference sample.

Description

Technical Field

[0001] This application belongs to the field of bias testing technology for belt mid-section sampling machine systems, and particularly relates to a static bias testing device and sampling method for belt mid-section sampling machine systems. Background Technology

[0002] Coal sampling primarily provides a basis for calculating the coal consumption for power generation and supply in thermal power plants. Data obtained through sampling, preparation, and analysis (SBA) allows for in-depth analysis and research of boiler fuel efficiency. Especially under the dual-carbon context, improving the quality of carbon verification and carbon emission quotas is crucial for thermal power plants. Coal SBA, as a vital component of carbon verification, provides accurate data. In SBA, 80% of the error originates from sampling. The accuracy of sampling determines the final test results and also affects the power plant's carbon emission quotas.

[0003] The belt conveyor sampling system plays a crucial role in sampling incoming coal and furnace coal in thermal power plants, ensuring efficient coal settlement and energy conservation. With continuous use, the performance of this system may decline to varying degrees, necessitating bias testing to assess its reliability. GB / T19494.3-2004 provides a method for bias testing of belt conveyor sampling systems. The primary method is the belt-stop sampling method, where the belt is stopped under load, and the sampling system is started to collect a primary sample. The location of the manual reference sample is as close as possible to the primary sample point but must not overlap. Thus, the primary sample collected by the sampling system and the manually collected reference sample constitute a pair of test samples. One belt stop can collect 2-3 pairs of test samples, while a minimum of 20 pairs of test samples are required for bias testing analysis, meaning the coal conveyor belt needs to be repeatedly started and stopped under load 8-10 times.

[0004] Therefore, it is imperative to study a static bias test device and sampling method for a belt mid-section sampling machine system to solve the problems of frequent heavy-load starting and stopping of the belt motor in the belt-stop sampling method, motor damage caused by the stop and stop, and inaccurate analysis results caused by poor representativeness of the reference sample. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a static bias test device and sampling method for a belt-driven mid-section sampling system. This avoids motor damage caused by frequent heavy-load starts and stops of the belt motor, reduces the risk of personnel getting caught in the belt during manual sampling, and simultaneously improves upon the problem of inaccurate analysis results due to poor representativeness of the reference sample. The technical solution is as follows:

[0006] The first aspect of this application provides a static bias test device for a belt conveyor sampling system, including a sampling workbench with a sampling head on one side. A reel motor is located at one end of the sampling workbench, and a wear-resistant soft material is placed inside the reel motor. Forward rotation of the reel motor extends the wear-resistant soft material along the sampling workbench and lays it flat on the workbench. Reverse rotation of the reel motor retracts the wear-resistant soft material along the sampling workbench and winds it back into the reel motor. A coal sample holding section is provided on the wear-resistant soft material. After a coal sample is placed in the coal sample holding section, the reel motor drives the wear-resistant soft material to move horizontally, so that the coal sample holding section corresponds to the sampling head, and the sampling head collects the coal sample held in the coal sample holding section.

[0007] For example, in one embodiment of the static bias test device for the belt mid-section sampling machine system, a sampling head motor is also included. The sampling head motor is connected to the sampling head and drives the sampling head to collect the coal sample contained in the coal sample holding section.

[0008] For example, in the static bias test device of the belt sampling machine system provided in one embodiment, the coal sample holding part is provided with two spaced baffle slots, and a baffle is provided in the baffle slots, through which the coal sample is held.

[0009] For example, in a static bias test apparatus for the belt mid-section sampling machine system provided in one embodiment, the distance between the two baffles is the same as the width of the sampling head in the direction parallel to the sampling worktable.

[0010] For example, in the static bias test apparatus of the belt sampling machine system provided in one embodiment, a stop roller is provided at the orthogonal projection of the drum motor on the sampling workbench.

[0011] For example, in the static bias test apparatus of the belt mid-section sampling machine system provided in one embodiment, the sampling head includes a sampling head cover, which is fitted onto the sampling head.

[0012] For example, in the static bias test apparatus of the belt mid-sampling machine system provided in one embodiment, an organic sampling outlet is provided at the end of the sampling head away from the sampling head cover.

[0013] For example, in the static bias test device of the belt sampling machine system provided in one embodiment, a coal conveyor belt is provided on the sampling workbench, and the wear-resistant soft material is located on the coal conveyor belt.

[0014] For example, in the static bias test apparatus of the belt mid-sampling machine system provided in one embodiment, the width of the wear-resistant soft material is the same as the width of the coal conveyor belt.

[0015] The second aspect of this application provides a static bias test sampling method for a belt conveyor sampling system, comprising the following steps: Step 1: Determine the mass and nominal maximum particle size of the test coal sample; collect primary subsamples under normal operating conditions and determine the scraping situation; determine the mass of the test coal sample based on the mass of the primary subsamples and the scraping situation; and determine the particle size of the test coal sample based on the opening size of the sampling head and the particle size of the crusher output; Step 2: Prepare coal samples; based on the mass and nominal maximum particle size of the test coal sample determined in Step 1, use a corresponding divider to reduce the mass of the coal sample to twice its original size, resulting in a pair of duplicate coal samples, one of which is a reference sample and the other is a machine sample, for a total of three samples. Ten pairs of coal samples; Step 3: Install the equipment; Lay the automatically retractable wear-resistant soft material flat on the coal conveyor belt; Step 4: Simulate working conditions; Lay the machine-sampled material, which was divided by the divider in Step 2, flat on the wear-resistant soft material; Step 5: Collect the machine-sampled material; Drive the wear-resistant soft material to move and drag the coal sample directly under the sampling head by the drum motor, start the sampling head motor to drive the sampling head to move, and collect the discarded and retained samples after being crushed and divided by the sample preparation unit, thus completing the collection of machine-sampled materials; Step 6: Discard the coal samples that were not collected on the wear-resistant soft material, and repeat Step 4 and Step 5 to complete the collection of thirty machine-sampled materials.

[0016] The beneficial effects of the static bias test device and sampling method of the belt mid-section sampling machine system of this application are as follows: the bias test can be completed when the belt stops running and the power is off. The sampling method of this application improves the work safety of the test personnel, avoids equipment damage caused by frequent belt starts and stops, avoids motor damage caused by frequent heavy-load starts and stops of the belt motor, reduces the risk of personnel being caught in the belt during manual sampling, and improves the problem of inaccurate analysis results caused by poor representativeness of the reference sample. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the static bias test device for the belt-mounted sampling machine system of this application;

[0019] Figure 2This is a diagram showing the state of the test coal sample being introduced into the coal sample container in this application;

[0020] Figure 3 This is a state diagram of the test coal sample collected in this application.

[0021] 100-Sampling workbench, 200-Sampling head, 210-Sampling head motor, 220-Sampling head cover, 230-Machine sampling outlet, 240-Sampling head rotating shaft, 300-Roller motor, 400-Wear-resistant soft material, 410-Coal sample container, 411-Baffle slot, 412-Baffle, 500-Baffle roller, 600-Coal conveyor belt, 700-Coal sample, 710-Discard sample, 720-Machine-sampled coal sample. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0024] The first aspect of this application provides a static bias test device for a belt-driven sampling machine system, such as... Figure 1As shown, the system includes a sampling workbench 100, with a sampling head 200 on one side. A drum motor 300 is located at one end of the sampling workbench 100, and a wear-resistant soft material 400 is disposed inside the drum motor 300. The wear-resistant soft material 400 extends and lays flat on the sampling workbench 100 by the forward rotation of the drum motor 300, and retracts and is wound inside the drum motor 300 by the reverse rotation of the drum motor 300. A coal sample holding part 410 is provided on the wear-resistant soft material 400. After the coal sample is placed in the coal sample holding part 410, the drum motor 300 drives the wear-resistant soft material 400 to move horizontally so that the coal sample holding part 410 corresponds to the sampling head 200, and the sampling head 200 collects the coal sample held in the coal sample holding part 410.

[0025] For example, in the static bias test apparatus of the belt mid-section sampling machine system provided in one embodiment, such as Figure 1 As shown, it also includes a sampling head motor 210, which is connected to the sampling head 200 and drives the sampling head 200 to collect the coal sample contained in the coal sample holding part 410.

[0026] The sampling head 200 is provided with a sampling head rotation shaft 240.

[0027] For example, in the static bias test apparatus of the belt mid-section sampling machine system provided in one embodiment, such as Figure 1 As shown, the coal sample holding part 410 is provided with two spaced baffle slots 411, and a baffle 412 is provided in the baffle slots 411, through which the coal sample is held.

[0028] The coal sample holding part 410 is located at the other end of the sampling workbench 100 away from the drum motor 300.

[0029] For example, in the static bias test apparatus of the belt mid-section sampling machine system provided in one embodiment, such as Figure 1 As shown, the distance between the two baffles 412 is the same as the width of the sampling head 200 in the direction parallel to the sampling worktable 100.

[0030] For example, in the static bias test apparatus of the belt mid-section sampling machine system provided in one embodiment, such as Figure 1 As shown, a stop roller 500 is provided at the orthographic projection of the drum motor 300 onto the sampling workbench 100.

[0031] For example, in the static bias test apparatus of the belt mid-section sampling machine system provided in one embodiment, such as Figure 1 As shown, the sampling head 200 includes a sampling head cover 220, which is fitted onto the sampling head 200.

[0032] For example, in the static bias test apparatus of the belt mid-section sampling machine system provided in one embodiment, such as Figure 1 As shown, an organic sampling outlet 230 is provided at the end of the sampling head 200 that is away from the sampling head cover 220.

[0033] For example, in the static bias test apparatus of the belt mid-section sampling machine system provided in one embodiment, such as Figure 1 As shown, a coal conveyor belt 600 is provided on the sampling workbench 100, and the wear-resistant soft material 400 is located on the coal conveyor belt 600.

[0034] For example, in the static bias test apparatus of the belt mid-section sampling machine system provided in one embodiment, such as Figure 1 As shown, the width of the wear-resistant soft material 400 is the same as the width of the coal conveyor belt 600.

[0035] The method of using the static bias test device of the belt sampling machine system in this application is as follows: First, install a drum motor 300 at the tail of the sampling workbench 100, and install a vertical guide roller 500 on the coal conveyor belt 600 directly below the drum motor 300; start the drum motor 300 to reverse, so that the wear-resistant soft material 400 in the drum motor 300 passes through the lower part of the vertical guide roller 500 and extends through the end of the sampling workbench 100, and then stop the drum motor 300. The wear-resistant material 400 has baffle slots 411 for installing baffles 412. The distance between the two baffle slots 411 is the same as the width of the sampling head cover 220. Two baffles 412 with the same curvature as the sampling workbench 100 are installed in the baffle slots 411. The height of the installed baffles 412 is lower than the bottom of the sampling workbench 100 so that they can pass through the sampling workbench 100. The prepared coal sample is poured into the coal sample holding part 410 between the two baffles 412. The drum motor 300 is started to rotate forward so that the coal sample holding part 410 is aligned with the sampling head cover 220. The sampling head motor 210 is manually started to complete the machine sampling. Figure 2 A diagram showing the state of the test coal sample 700 being introduced into the coal sample container 410 is provided. Figure 3 This is a diagram showing the state of the coal sample after collection. The machine-sampled coal sample 720 is exported from the machine sampling outlet 230, and the discarded sample 710 is located in the coal sample holding section 410.

[0036] The second aspect of this application provides a static bias test sampling method for a belt-mounted sampling system, comprising the following steps:

[0037] Step 1: Determine the mass and nominal maximum particle size of the test coal sample; collect primary samples under normal operating conditions and determine the scraping situation; determine the mass of the test coal sample based on the mass of the primary samples and the scraping situation; and determine the particle size of the test coal sample based on the opening size of the sampling head and the particle size of the crusher output.

[0038] Step 2: Prepare coal samples; Based on the test coal sample mass and nominal maximum particle size determined in Step 1, use the corresponding divider to reduce the coal sample to twice the determined mass, resulting in a pair of double coal samples, one of which is a reference sample and the other is a machine sample. Prepare a total of thirty pairs of coal samples.

[0039] Step 3: Install the equipment; lay the automatically retractable wear-resistant soft material on the coal conveyor belt;

[0040] Step 4: Simulate working conditions; spread the sample obtained in Step 2 by the divider onto the wear-resistant soft material; by determining the coal sample quality, it can be ensured that the width of the coal sample is consistent with the width of the sampling head and the thickness of the coal layer is consistent with the thickness of the coal layer during normal coal feeding.

[0041] Step 5: Machine sampling; The wear-resistant soft material is moved horizontally by the drum motor and the coal sample is dragged to the underside of the sampling head. The sampling head motor is started to drive the sampling head to move and collect the discarded and retained samples after being crushed and reduced by the sample preparation unit, thus completing the machine sampling.

[0042] Step Six: Discard the coal samples that were not collected from the wear-resistant soft material, and repeat Steps Four and Five to complete the collection of thirty machine-made samples.

[0043] The static bias test device and sampling method for the belt-driven sampling system disclosed in this application avoids motor damage caused by frequent heavy-load starts and stops of the belt motor, reduces the risk of personnel being caught in the belt during manual sampling, and improves the accuracy of analytical results caused by poor representativeness of the reference sample. The bias test can be completed by using a drum motor and a wear-resistant soft material when the belt is stopped and the power is off. This method improves the safety of experimental personnel and avoids equipment damage caused by frequent belt starts and stops.

[0044] Although embodiments of this application have been disclosed for illustrative purposes, those skilled in the art will recognize that various modifications, additions, and substitutions can be made without departing from the scope and spirit of the invention as disclosed in the appended claims.

Claims

1. A static bias test device for a belt-driven sampling system, characterized in that, include: A sampling workbench, with a sampling head provided on one side of the sampling workbench; A reel motor is located at one end of the sampling worktable. A wear-resistant soft material is provided inside the reel motor. The wear-resistant soft material is extended and laid flat on the sampling worktable by the forward rotation of the reel motor. The wear-resistant soft material is retracted along the sampling worktable and wound inside the reel motor by the reverse rotation of the reel motor. The wear-resistant soft material is provided with a coal sample holding part. After the coal sample is placed in the coal sample holding part, the wear-resistant soft material is moved horizontally by the drum motor so that the coal sample holding part corresponds to the sampling head, and the coal sample held in the coal sample holding part is collected by the sampling head. It also includes a sampling head motor, which is connected to the sampling head and drives the sampling head to collect the coal sample contained in the coal sample holding section; A coal conveyor belt is provided on the sampling workbench, and the wear-resistant soft material is located on the coal conveyor belt.

2. The static bias test device for the belt mid-section sampling machine system according to claim 1, characterized in that, The coal sample holding section is provided with two spaced-apart baffle slots, and baffles are provided in the baffle slots to hold the coal sample.

3. The static bias test device for the belt mid-section sampling machine system according to claim 2, characterized in that, The distance between the two baffles is the same as the width of the sampling head in the direction parallel to the sampling worktable.

4. The static bias test device for the belt mid-section sampling machine system according to claim 1, characterized in that, A stop roller is provided at the orthographic projection of the drum motor onto the sampling workbench.

5. The static bias test device for the belt mid-section sampling machine system according to claim 1, characterized in that, The sampling head includes a sampling head cover, which is fitted onto the sampling head.

6. The static bias test device for the belt mid-section sampling machine system according to claim 5, characterized in that, An organic sampling outlet is provided at the end of the sampling head away from the sampling head cover.

7. The static bias test device for the belt mid-section sampling machine system according to claim 1, characterized in that, The width of the wear-resistant soft material is the same as the width of the coal conveyor belt.

8. The sampling method of the static bias test device for the belt mid-section sampling machine system according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Determine the mass and nominal maximum particle size of the test coal sample; collect primary samples under normal operating conditions and determine the scraping conditions; determine the mass of the test coal sample based on the mass of the primary samples and the scraping conditions; and determine the nominal maximum particle size based on the opening size of the sampling head and the output particle size of the crusher. Step 2: Prepare coal samples; Based on the test coal sample mass and nominal maximum particle size determined in Step 1, use the corresponding divider to reduce the coal sample to twice the determined mass, resulting in a pair of double coal samples, one of which is a reference sample and the other is a machine sample. Prepare a total of thirty pairs of coal samples. Step 3: Install the equipment; lay a soft, wear-resistant material that can automatically expand and contract on the coal conveyor belt; Step 4: Simulate working conditions; spread the mechanical sample obtained in Step 2 by the divider onto a wear-resistant soft material; Step 5: Machine sampling; The wear-resistant soft material is moved horizontally by the drum motor and the coal sample is dragged to the underside of the sampling head. The sampling head motor is started to drive the sampling head to move and collect the discarded and retained samples after the sample preparation unit has crushed and reduced the sample size, thus completing the machine sampling. Step Six: Discard any coal samples that were not collected from the wear-resistant soft material, and repeat Steps Four and Five to complete the collection of thirty machine-sampled units.

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