A sampling device and test method for static bias test of a tape center-type sampler

Abstract

This invention belongs to the technical field of bias testing for coal mining machinery sampling equipment, and relates to a static bias testing sampling device and method for a conveyor belt mid-section sampler. The device includes a lower base, a supporting steel frame, an upper base, a protective cover, a sampler, a motor, and a three-way feed pipe, among other components. The base of the sampling device is designed to open and close vertically. It employs a static testing method for bias testing of the sampler, eliminating the need for frequent braking of the coal conveyor belt, effectively reducing equipment and enterprise production safety risks, and improving work efficiency. After the reference sample and mechanical sample are prepared, the subsequent testing schedule can be flexibly arranged according to production and personnel needs, avoiding continuous fatigue work and damage to sample representativeness. The bias test is conducted with the conveyor belt powered off, and the sampling unit has a protection mechanism, improving the safety of the test operator. The technical solution of this invention is highly versatile, simple to operate, and has strong practical value.

Description

Technical Field

[0001] This invention belongs to the technical field of bias testing of coal mechanical sampling equipment, and relates to a static bias testing sampling device and testing method for a belt-type sampler. Background Technology

[0002] Belt-type coal samplers obtain samples by scraping and cutting the coal across the entire cross-section of the conveyor belt. They typically consist of a sampling head, material flow detection device, chute, primary feeder, secondary feeder, crusher, divider, sample collector, and residual coal return equipment. Each component can introduce significant bias, causing the sample readings to fail to represent the true quality of the batch of coal. Therefore, the accuracy, sampling precision, and bias of the sampler compared to manual sampling are key concerns for most users of mechanized coal samplers. GB / T 19494.3-2004 "Mechanized Sampling of Coal - Part 3: Precision Determination and Bias Test" specifies that the bias test of a belt-driven sampler is generally performed by stopping the belt sampling method. The specific method is as follows: start the sampling system, and after the primary sampler takes a sample, immediately stop the coal conveyor belt (but the sample preparation system continues to run). Take a reference sample at a point before or after the primary sample point, close to but not intersecting with it, where the coal flow is not disturbed. At the same time, collect the sample after the final reduction stage of the sampling system. The two samples constitute a sample pair.

[0003] However, completing the bias test of the conveyor belt sampler requires repeating the above operations at least 20 times. Furthermore, to prevent significant deviations caused by coal quality, sampling, sample preparation, and testing, the number of braking operations on the conveyor belt during the bias test will be even greater. Continuous and frequent emergency stops of the conveyor belt can easily lead to motor failure, causing sudden conveyor belt shutdown, boiler MFT (Maintenance, Trip, and Failure) cascading, and even generator unit outages. When frequent motor starts are required, there are clear regulations regarding start-stop intervals. For example, during dynamic balancing tests, motors below 200 kW should not be less than 0.5 hours, motors between 200 and 500 kW should not be less than 1 hour, and motors of 500 kW and above should not be less than 2 hours. This makes the entire bias test operation time excessively long, affecting normal production and causing continuous fatigue for sampling personnel. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the implementation of the bias test method specified in GB / T 19494.3-2004. This invention proposes a static bias test sampling device and test method for a tape center-type sampler.

[0005] A static bias test sampling device for a tape-type sampler includes a supporting steel frame with a lower base mounted on it. A recessed groove is formed on the surface of the lower base, and an upper base of the same size is positioned within the groove. One end of the upper base is hinged to the corresponding end face of the lower base, and the other end is connected to the corresponding end face of the lower base. The recessed groove has a sampler hole penetrating the lower base and a pair of baffle holes on either side of the sampler hole. The upper base has a through hole of the same size and position corresponding to the sampler hole. A protective cover is mounted on the surface of the upper base, completely covering the through hole. A motor is mounted on the upper base. The sampler is positioned on the surface of the base and arranged on one side of the protective cover. The output shaft of the motor is connected to the shaft that passes through the protective cover. The sampler is installed in the sampler hole and the through hole on the upper base. The sampler is connected to the inside of the protective cover by the shaft. The motor drives the shaft to rotate, thereby causing the sampler to rotate in the space formed by the sampler hole, the through hole on the upper base, and the protective cover. The bottom of the sampler is clearance-fitted with the surface of the coal conveying belt located below the lower base. The baffle is installed in the baffle insertion hole, and the bottom of the baffle is in flexible contact with the surface of the coal conveying belt. The herringbone tee is installed at the bottom of the coal conveying belt, and the inlet of the herringbone tee is connected to the coal conveying belt.

[0006] Furthermore, one end of the upper base is connected to the corresponding end face of the lower base via a hinge, and the other end is connected to the corresponding end face of the lower base via a locking structure.

[0007] Furthermore, the width of the sampler hole and the through hole on the upper base is twice the width of the sampler.

[0008] Furthermore, a lifting lug is provided on the surface of the upper base near the locking structure.

[0009] Furthermore, the upper base is fixedly connected to the protective cover with nuts; the lower base is welded and fixed to the supporting steel frame.

[0010] Furthermore, the upper surface of the upper base and the upper surface of the lower base are located on the same horizontal plane.

[0011] Furthermore, the upper base can rotate relative to the lower base at an angle of ≤90° along the hinge.

[0012] Furthermore, it also includes bearing housings, which are located on both sides of the protective cover to support the shaft that passes through the protective cover.

[0013] Furthermore, the herringbone tee includes a main discharge port and a secondary discharge port. The herringbone tee is equipped with a baffle plate inside, which includes an installation end and a plate. The installation end is movably connected to the inner wall of the herringbone tee. The installation end can drive the plate to rotate, so that the inlet can switch and connect with the main and secondary discharge ports.

[0014] Furthermore, the baffle includes an arc-shaped plate, a spring sleeve, and a spring. The arc-shaped plate has several parallel vertical cylindrical deep holes on its arc surface. The spring sleeve is respectively set in each vertical cylindrical deep hole and can slide relative to each other in the vertical cylindrical deep hole. When the pair of baffles is inserted into the baffle insertion hole, the pin is inserted into the lower base. The horizontal plane of the arc-shaped plate does not exceed the bottom surface of the sink trough. Under the action of the spring, the spring sleeve is tightly fitted with the arc surface of the coal conveying belt.

[0015] Furthermore, it also includes a scraper, which consists of a scraper head and a telescopic handle, with a removable wear-resistant rubber strip on the scraper head.

[0016] A method for conducting a static bias test on a sampler using the aforementioned tape-type sampler static bias test sampling device includes the following steps:

[0017] Step 1: Manually collect reference samples and mechanical samples;

[0018] Step 2: Perform static mechanical sampling to obtain discarded and retained samples;

[0019] Step 3: Prepare, test, and statistically analyze the collected reference samples, discarded samples, and retained samples to calculate the bias value across the tape sampler and complete the static bias test of the tape sampler.

[0020] Furthermore, step 1 includes the following steps:

[0021] Step 1-1: Select coal samples with a nominal maximum particle size less than 1 / 3 of the sampler width as test coal;

[0022] Steps 1-2: Start the coal feeder and coal conveyor belt. When the coal flow is uniform and completely covers the entire coal conveyor belt, stop the coal feeder and coal conveyor belt and disconnect the power to the equipment.

[0023] Steps 1-3: Set up several sampling areas at equal intervals on the coal conveyor belt. Each sampling area includes a reference sample sampling area I and a mechanical sample sampling area II set up in sequence along the conveyor belt direction. The reference sample sampling area I and the mechanical sample sampling area II are arranged alternately in sequence.

[0024] Steps 1-4: In accordance with the provisions of GB / T 19494.3-2004, use the sampling frame to sequentially collect the reference sample and mechanical sample in the reference sample sampling area I and the mechanical sample sampling area II, and put them into sealed bags for later use.

[0025] Furthermore, in steps 1-3, the sampling width of the reference sample sampling area I is equal to the width of the sampler, and the sampling width of the mechanical sample sampling area II is equal to twice the width of the sampler.

[0026] Furthermore, in steps 1-3, the number of sampling areas is set to 30 groups. Each group of sampling areas includes reference sample sampling areas I-1 to I-30 and mechanical sample sampling areas II-1 to II-30. During sampling in steps 1-4, reference samples C-1 to C-30 are collected in reference sample sampling areas I-1 to I-30, and mechanical samples J-1 to J-30 are collected in mechanical sample sampling areas II-1 to II-30.

[0027] Furthermore, step 2 includes the following steps:

[0028] Step 2-1: In the event of a power outage on the coal conveyor belt, adjust the sampler to local operation mode;

[0029] Step 2-2: Open the locking structure, connect the lifting mechanism to the lifting lugs via steel rope and hook, start the lifting mechanism to rotate forward so that the upper base rotates relative to the lower base along the hinge. At this time, the sampler is completely retracted into the protective cover and the sampler is locked.

[0030] Steps 2-3: Insert the pair of baffles into the baffle insertion holes and insert the pins into the lower base. At this time, under the action of the elastic force, the spring sleeve and the arc surface of the coal conveying belt will automatically fit tightly together.

[0031] Steps 2-4: Pour mechanical sample J-1 into the arc-shaped space clamped by the paired baffles and coal conveying belt, and scrape it flat with a scraper. Start the crane mechanism to reverse so that the upper base is completely in contact with the sinking trough. After closing the locking structure, unlock the sampler. Adjust the dial so that the feed port of the herringbone tee is connected to the primary feed belt of the sampler through the main discharge port.

[0032] Steps 2-5: Control the sampler to perform one sampling. After the primary subsample has completed the crushing and reduction process, collect the discarded sample and the retained sample respectively.

[0033] Step 2-6: Repeat step 2-2, adjust the lever to connect the feed inlet of the herringbone tee with the auxiliary discharge outlet, scrape off the residual coal sample in the arc-shaped space with a scraper, and discharge it through the auxiliary discharge outlet and put it into a waste bag;

[0034] Step 2-7: Repeat steps 2-4, 2-5 and 2-6 to complete the static mechanical sampling of J-2 to J-30 in sequence, and collect the discarded samples and retained samples in turn;

[0035] Steps 2-8: Remove the paired baffles, close the locking structure, and restore the equipment to automatic operation.

[0036] Furthermore, step 3 specifically involves preparing, testing, and statistically analyzing the 30 sets of reference samples, discarded samples, and retained samples collected, in accordance with GB / T19494-2004 "Mechanized Sampling of Coal". The bias value across the belt sampler is calculated, and the static bias test of the belt sampler is completed.

[0037] The beneficial effects of this invention are as follows: Compared with the bias test method specified in GB / T 19494.3-2004, the biggest difference of this invention is that the sampling device base is designed to be openable and closable, and the bias test is conducted in a static manner. This eliminates the need for frequent braking of the coal conveyor belt, effectively reducing equipment and enterprise production safety risks and improving work efficiency. After the reference sample and mechanical sample are prepared, the subsequent test schedule can be flexibly arranged according to production and personnel needs, avoiding continuous fatigue operation and damage to sample representativeness. The bias test is conducted under power failure of the conveyor belt and the sampling unit has a protection mechanism, which can improve the safety of the tester. The technical solution of this invention is highly versatile, simple to operate, and has strong practical value. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the tape-type sampling machine used in the embodiments of the present invention;

[0039] Figure 2 This is a top view of the tape-type sampling machine used in this embodiment of the invention;

[0040] Figure 3 for Figure 1 Schematic diagram of the lower base (including supporting steel frame);

[0041] Figure 4 This is a schematic diagram of the sampler of the tape-type sampler used in the embodiments of the present invention;

[0042] Figure 5 This is a schematic diagram of the baffle used in an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram showing the fit between the spring sleeve and the spring of the baffle used in the embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of the scraper used in an embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of the process of the present invention;

[0046] Figure 9 This is a schematic diagram of the sampling of the reference sample and the mechanical sample in an embodiment of the present invention;

[0047] The attached figures are labeled as follows: 1-Sampling device, 11-Lower base, 111-Sinking trough, 112-Baffle insertion hole, 113-Sampler hole, 12-Support steel frame, 13-Upper base, 131-Locking structure, 132-Lifting lug, 133-Hinge, 14-Protective cover, 15-Sampler, 16-Motor, 161-Bearing seat, 162-Shaft, 17-Herringbone tee, 171-Main discharge port, 172-Secondary discharge port, 2-Coal conveyor belt, 3-Coal flow, 4-Baffle, 41-Arc plate, 42-Spring sleeve, 43-Spring, 44-Pin, 5-Scraper, 51-Scraper head, 52-Telescopic handle. Detailed Implementation

[0048] The following description, with reference to the accompanying drawings, further details the specific embodiments of the present invention, including the shape and structure of each component, the relative positions and connections between the parts, the function and working principle of each part, the manufacturing process, and the operation and use methods. This is to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the concept and technical solution of the present invention.

[0049] One embodiment of the present invention, such as Figures 1-4As shown, the static bias test sampling device 1 of the tape-type sampler in this embodiment includes a supporting steel frame 12, a lower base 11 on the supporting steel frame, a recessed groove 111 on the surface of the lower base 11, an upper base 13 of the same size in the recessed groove 111, the lower base 11 being divided into side A and side B, one end of the upper base 13 being hinged to the end face of side B of the lower base 11 by a hinge 132, and the other end of the upper base 13 being connected to the end face of side A of the lower base 11 by a locking structure 131, the recessed groove 111 having a sampler hole 113 penetrating the lower base 11 and a pair of baffle insertion holes 112 on both sides of the sampler hole 113, the upper base 13 having a through hole of the same size corresponding to the sampler hole 113, a protective cover 14 being disposed on the surface of the upper base 13 and completely covering the through hole on the upper base 13, and a motor 16 being disposed on the surface of the upper base 13 and arranged in the protective cover 14. On one side, the output shaft of the motor 16 is connected to the shaft 162 that passes through the protective cover 14. The sampler 15 is installed in the sampler hole 113 and the through hole on the upper base 13, and is connected to the inside of the protective cover 14 through the shaft 162. The width of the inner wall of the protective cover 14 is equal to the width of the sampler hole 113. It also includes a bearing seat 161, which is installed on both sides of the protective cover 14 to support the shaft 162 that passes through the protective cover 14. The motor 16 drives the shaft 162 to rotate, thereby driving the sampler 15 to rotate in the space formed by the sampler hole 113, the through hole on the upper base 13 and the protective cover 14. The bottom of the sampler 15 is clearance-fitted with the surface of the coal conveying belt 2 installed below the lower base 11. The baffle 4 is installed in the baffle insertion hole 112, and the bottom of the baffle 4 is in flexible contact with the surface of the coal conveying belt 2. The herringbone tee 17 is installed at the bottom of the coal conveying belt 2, and the inlet of the herringbone tee 17 is connected to the coal conveying belt 2.

[0050] In an embodiment of the present invention, the width of the sampler hole 113 and the through hole on the upper base 13 is twice the width of the sampler 15; for example Figure 4 As shown, sampler 15 should meet the design requirements of GB / T 30730-2014 "Technical Conditions for Coal Mechanized Sampling Systems".

[0051] In an embodiment of the present invention, a pair of lifting lugs 132 are welded to the upper base 13 near side A. The lifting mechanism connects the lifting lugs 132 with steel ropes and hooks, which allows the upper base 13 to rotate relative to the lower base 11 at an angle ≤90° along the hinge 133.

[0052] In an embodiment of the present invention, the upper base 13 and the protective cover 14 are fixedly connected by nuts; the lower base 11 is welded and fixed to the supporting steel frame 12 to ensure a firm connection.

[0053] In an embodiment of the present invention, the upper base 13 can be completely submerged in the sinking groove 111 of the lower base 11, and the upper surface of the upper base 13 and the upper surface of the lower base 11 are located on the same horizontal plane.

[0054] In embodiments of the present invention, such as Figure 1 The herringbone tee 17 is located at the bottom of the coal conveying belt 2. The herringbone tee 17 includes a main discharge port 171 and a secondary discharge port 172. The inlet of the herringbone tee 17 is connected to the coal conveying belt 2. The herringbone tee 17 is equipped with a baffle plate including an installation end and a plate surface. The installation end is movably connected to the inner wall surface of the herringbone tee 17. The installation end can drive the plate surface to rotate, so that the inlet and the main and secondary discharge ports can be switched and connected.

[0055] In embodiments of the present invention, such as Figure 4 The diagram shows the structure of the sampler 15. The sampler 15 is installed in the space formed by the sampler hole 113, the through hole on the upper base 13, and the protective cover 14. There are two symmetrical shaft holes in the middle of the sampler. The sampler 15 is connected to the protective cover 14 by the shaft 162 passing through the two shaft holes. Under the action of the motor 16, the shaft 162 can drive the sampler to rotate and sample in the space formed by the sampler hole 113, the through hole on the upper base 13, and the protective cover 14. The bottom of the sampler 15 is an arc-shaped surface, which is adapted to the arc-shaped surface of the coal conveyor belt 2 and has a certain gap to ensure that the sampler 15 will not touch the surface of the coal conveyor belt 2 and cause jamming.

[0056] In embodiments of the present invention, such as Figure 5 , 6 As shown, the baffle 4 includes an arc-shaped plate 41, a spring sleeve 42, and a spring 43. The bottom surface of the arc-shaped plate 41 is arc-shaped, and the top surface is horizontal. Several vertical cylindrical deep holes are arranged in parallel on the arc-shaped surface of the arc-shaped plate 41. The spring sleeve 42 is respectively disposed in each vertical cylindrical deep hole and can slide relative to it within the vertical cylindrical deep hole. Figure 3 As shown, when the pair of baffles 4 are inserted into the baffle insertion hole 112, the pin 44 is inserted into the lower base 11. The horizontal plane of the arc plate 41 does not exceed the bottom surface of the sink trough 111. Under the action of the spring 43, the spring sleeve 42 is tightly fitted with the arc surface of the coal conveying belt 2.

[0057] In embodiments of the present invention, a rake 5 is also required during sampling, such as... Figure 7 As shown, the scraper 5 includes a scraper head 51 and a telescopic handle 52. The scraper head 51 is equipped with a wear-resistant rubber strip that is easy to replace, and the telescopic handle 52 can be adjusted in length according to the user's needs.

[0058] Another embodiment of the present invention is a method for conducting a static bias test of a sampler using a tape-type sampler static bias test sampling device, comprising the following steps:

[0059] Step 1: Manually collect reference samples and mechanical samples;

[0060] Step 1-1: Select coal samples with a nominal maximum particle size less than 1 / 3 of the sampler width as test coal;

[0061] Steps 1-2: Start the coal feeder and coal conveyor belt 2. When the coal flow is uniform and completely covers the entire coal conveyor belt 2, stop the coal feeder and coal conveyor belt 2 and disconnect the power to the equipment.

[0062] Steps 1-3: Set up 30 sampling zones at equal intervals on the coal conveyor belt 2. Each sampling zone includes a reference sample sampling zone I and a mechanical sample sampling zone II arranged sequentially along the conveyor belt direction, with the reference sample sampling zone I and mechanical sample sampling zone II arranged alternately. Each sampling zone includes reference sample sampling zones I-1 to I-30 and mechanical sample sampling zones II-1 to II-30. During sampling in steps 1-4, reference samples C-1 to C-30 are collected from reference sample sampling zones I-1 to I-30, and mechanical samples J-1 to J-30 are collected from mechanical sample sampling zones II-1 to II-30. The sampling width of reference sample sampling zone I is equal to the width of sampler 15, and the sampling width of mechanical sample sampling zone II is equal to twice the width of sampler 15.

[0063] Steps 1-4: In accordance with the provisions of GB / T 19494.3-2004, use the sampling frame to sequentially collect the reference sample and mechanical sample in the reference sample sampling area I and the mechanical sample sampling area II, and put them into sealed bags for later use.

[0064] Step 2: Perform static mechanical sampling to obtain discarded and retained samples;

[0065] Step 2-1: In the event of a power outage on the coal conveyor belt, adjust the sampler to local operation mode;

[0066] Step 2-2: Open the locking structure 131, connect the lifting mechanism to the lifting lug 132 through the steel rope and hook, start the lifting mechanism to rotate forward so that the upper base 13 rotates relative to the lower base 11 along the hinge 133. At this time, the sampler 15 is completely retracted into the protective cover 14 and the sampler 14 is locked.

[0067] Steps 2-3: Insert the pair of baffles 4 into the baffle insertion hole 112 and insert the pin 44 into the lower base 11. At this time, under the action of the elastic force, the spring sleeve 42 and the arc surface of the coal conveying belt 2 will automatically fit tightly together.

[0068] Steps 2-4: Pour the mechanical sample J-1 into the arc-shaped space clamped by the paired baffles 4 and the coal conveying belt 2, and scrape it flat with the scraper 5. Start the crane mechanism to reverse so that the upper base 13 is completely in contact with the sink trough 111. After closing the locking structure 131, the sampler 15 is unlocked. Adjust the dial so that the inlet of the herringbone tee 17 is connected to the primary feed belt of the sampler through the main outlet 171.

[0069] Steps 2-5: Control sampler 15 to perform one sampling. After the primary subsample has completed the crushing and reduction process, collect the discarded sample and the retained sample respectively.

[0070] Step 2-6: Repeat step 2-2, adjust the lever to connect the inlet of the herringbone tee 17 with the auxiliary outlet 172, use the scraper 5 to scrape off the coal sample remaining in the arc space, and discharge it through the auxiliary outlet 172 and put it into the waste bag.

[0071] Step 2-7: Repeat steps 2-4, 2-5 and 2-6 to complete the static mechanical sampling of J-2 to J-30 in sequence, and collect the discarded samples and retained samples in turn;

[0072] Steps 2-8: Pull out the paired baffles 4, close the locking structure 131, and restore the equipment to automatic operation.

[0073] Step 3: Prepare, test, and statistically analyze the collected reference samples, discarded samples, and retained samples to calculate the bias value across the belt sampler and complete the static bias test of the belt sampler. Specifically, this step is carried out in accordance with GB / T19494-2004 "Mechanized Sampling of Coal", preparing, testing, and statistically analyzing the collected 30 sets of reference samples, discarded samples, and retained samples to calculate the bias value across the belt sampler and complete the static bias test of the belt sampler.

[0074] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A sampling device for static bias test of a tape-type sampler, characterized in that, The system includes a supporting steel frame with a lower base. A recessed groove is formed on the surface of the lower base, and an upper base of the same size is positioned within the groove. The groove has a sampler hole penetrating the lower base and a pair of baffle insertion holes on either side of the sampler hole. The upper base has a through hole of the same size and position corresponding to the sampler hole. A protective cover is mounted on the surface of the upper base, completely covering the through hole. A motor is mounted on the surface of the upper base and positioned to one side of the protective cover. The motor's output shaft is connected to a shaft penetrating the protective cover. The sampler is positioned within the sampler hole and the through hole on the upper base, and is connected to the inside of the protective cover via a shaft. The motor drives the shaft to rotate, thereby causing the sampler to rotate within the space formed by the sampler hole, the through hole on the upper base, and the protective cover. The bottom of the sampler is clearance-fitted to the surface of a coal conveyor belt positioned below the lower base. Baffles are positioned within baffle insertion holes, with the bottom of the baffles flush with the surface of the coal conveyor belt. The flexible contact herringbone tee is located at the bottom of the coal conveyor belt, and its inlet is connected to the belt. One end of the upper base is hinged to the corresponding end face of the lower base, and the other end is locked to the corresponding end face of the lower base. A lifting lug is provided on the surface of the upper base near the locking structure, allowing the upper base to rotate relative to the lower base at an angle ≤90° along the hinge. The herringbone tee includes a main outlet and a secondary outlet, and its interior contains an installation end. The plate and the mounting end are movably connected to the inner wall of the herringbone tee. The mounting end can drive the plate to rotate, so that the inlet and the main and auxiliary outlets can be switched and connected. The baffle includes an arc plate, a spring sleeve, and a spring. The arc plate has several vertical cylindrical deep holes arranged in parallel on its arc surface. The spring sleeve is set in each vertical cylindrical deep hole and can slide relative to each other in the vertical cylindrical deep hole. When the pair of baffles is inserted into the baffle insertion hole, the pin is inserted into the lower base.

2. The sampling device for static bias test of a tape center-type sampler according to claim 1, characterized in that, The width of the sampler hole and the through hole on the upper base is twice the width of the sampler.

3. The sampling device for static bias test of a tape center-type sampler according to claim 1, characterized in that, The upper base is fixedly connected to the protective cover with nuts; the lower base is welded and fixed to the supporting steel frame.

4. The sampling device for static bias test of a tape center-type sampler according to claim 1, characterized in that, The upper surface of the upper base and the upper surface of the lower base are on the same horizontal plane.

5. The sampling device for static bias test of a tape-type sampler according to claim 1, characterized in that, It also includes bearing housings, which are located on both sides of the protective cover to support the shaft that passes through the protective cover.

6. The sampling device for static bias test of a tape-type sampler according to claim 1, characterized in that, The horizontal plane of the arc plate does not extend beyond the bottom of the sinking trough. Under the action of the spring, the spring sleeve is tightly fitted with the arc surface of the coal conveying belt.

7. The sampling device for static bias test of a tape-type sampler according to claim 1, characterized in that, It also includes a scraper, which consists of a scraper head and a telescopic handle, with a removable wear-resistant rubber strip on the scraper head.

8. A method for conducting a static bias test on a sampler using the tape-center type sampler static bias test sampling device as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Manually collect reference samples and mechanical samples; Step 1 includes the following steps: Step 1-1: Select coal samples with a nominal maximum particle size less than 1 / 3 of the sampler width as test coal; Steps 1-2: Start the coal feeder and coal conveyor belt. When the coal flow is uniform and completely covers the entire coal conveyor belt, stop the coal feeder and coal conveyor belt and disconnect the power to the equipment. Steps 1-3: Several sampling areas are set up at equal intervals on the coal conveyor belt. Each sampling area includes a reference sample sampling area I and a mechanical sample sampling area II set up sequentially along the conveyor belt direction. The reference sample sampling area I and the mechanical sample sampling area II are arranged alternately. In Steps 1-3, the number of sampling areas is set to 30. Each sampling area includes reference sample sampling areas I-1 to I-30 and mechanical sample sampling areas II-1 to II-30. When sampling in Steps 1-4, reference samples C-1 to C-30 are collected in reference sample sampling areas I-1 to I-30, and mechanical samples J-1 to J-30 are collected in mechanical sample sampling areas II-1 to II-30. Steps 1-4: In accordance with the provisions of GB / T 19494.3-2004, use the sampling frame to sequentially complete the sampling of the reference sample in the reference sample sampling area I and the mechanical sample sampling area II, and put them into sealed bags for later use. Step 2: Perform static mechanical sampling to obtain discarded and retained samples. Step 2 includes the following steps: Step 2-1: In the event of a power outage on the coal conveyor belt, adjust the sampler to local operation mode; Step 2-2: Open the locking structure, connect the lifting mechanism to the lifting lugs via steel rope and hook, start the lifting mechanism to rotate forward so that the upper base rotates relative to the lower base along the hinge. At this time, the sampler is completely retracted into the protective cover and the sampler is locked. Steps 2-3: Insert the pair of baffles into the baffle insertion holes and insert the pins into the lower base. At this time, under the action of the elastic force, the spring sleeve and the arc surface of the coal conveying belt will automatically fit tightly together. Steps 2-4: Pour mechanical sample J-1 into the arc-shaped space clamped by the paired baffles and coal conveying belt, and scrape it flat with a scraper. Start the crane mechanism to reverse so that the upper base is completely in contact with the sinking trough. After closing the locking structure, unlock the sampler. Adjust the dial so that the feed port of the herringbone tee is connected to the primary feed belt of the sampler through the main discharge port. Steps 2-5: Control the sampler to perform one sampling. After the primary subsample has completed the crushing and reduction process, collect the discarded sample and the retained sample respectively. Step 2-6: Repeat step 2-2, adjust the lever to connect the feed inlet of the herringbone tee with the auxiliary discharge outlet, scrape off the residual coal sample in the arc-shaped space with a scraper, and discharge it through the auxiliary discharge outlet and put it into a waste bag; Step 2-7: Repeat steps 2-4, 2-5 and 2-6 to complete the static mechanical sampling of J-2 to J-30 in sequence, and collect the discarded samples and retained samples in turn; Steps 2-8: Remove the paired baffles, close the locking mechanism, and restore the equipment to automatic operation. Step 3: Prepare, test, and statistically analyze the collected reference samples, discarded samples, and retained samples to calculate the bias value across the tape sampler and complete the static bias test of the tape sampler.

9. The static bias test method for a sampling machine according to claim 8, characterized in that, In steps 1-3, the sampling width of the reference sample sampling area I is equal to the width of the sampler, and the sampling width of the mechanical sample sampling area II is equal to twice the width of the sampler.

10. The static bias test method for a sampling machine according to claim 8, characterized in that, Step 3 specifically involves preparing, testing, and statistically analyzing the 30 sets of reference samples, discarded samples, and retained samples collected, in accordance with GB / T19494-2004 "Mechanized Sampling of Coal". The bias value across the belt sampler is calculated, and the static bias test of the belt sampler is completed.

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