A kind of falling material flow sampling device

Abstract

The invention relates to a blanking flow sampling device. The blanking flow sampling device comprises a support frame, wherein a main lifting mechanism is vertically suspended on the top of the support frame, a supporting cross plate is connected to the lower end of the main lifting mechanism, and two material limiting plates are vertically arranged under the left and right parts of the supporting cross plate in parallel at intervals; a support platform is arranged in the middle of the bottom of the support frame, two conveying rails extending leftwards are arranged on the front and rear side frames of the support platform, and a material receiving trolley is arranged on the conveying rails; and a square material receiving tank is arranged on the material receiving trolley, the top of the material receiving tank is opened, an overturning unloading tank bottom is arranged at the bottom of the material receiving tank, discharging holes are oppositely formed in the middles of the front side wall and the rear side wall of the material receiving tank, and push-pull doors capable of blocking the discharging holes are arranged on the outer sides of the discharging holes. The blanking flow sampling device has the beneficial effects that by increasing an impact shearing function, the sampling process is standard, fair and impartial and completely meets basic sampling requirements, and any bias of a sample is avoided.

Description

technical field [0001] The invention relates to a solid material falling flow sampling device and a sampling method, which are suitable for sampling at the falling flow of solid materials, can be used at the falling flow of the belt head or other falling flows, and are suitable for large-scale power plants, coal mines, etc. Sampling of coal and other bulk materials in factories and mines. Background technique [0002] There are two types of belt sampling machines at present, one is the middle belt (across the belt) sampling machine, and the other is the belt head (falling material flow) sampling machine. The cross-belt sampling machine is installed above the belt. The design principle is that the sampler rotates at regular intervals and cuts the moving material flow on the belt in a horizontal full section. The disadvantages of this sampling machine are: 1. In order not to damage the bottom of the belt sampler and The belt must be kept at a certain distance. The material at...

AI Technical Summary

Problems solved by technology

The cross-belt sampling machine is installed above the belt. The design principle is that the sampler rotates at regular intervals and cuts the moving material flow on the belt in a horizontal full section. The disadvantages of this sampling machine are: 1. In order not to damage the bottom of the belt sampler and The belt must be kept at a certain distance, and the material at the bottom of the belt cannot be collected. When the material flow is thin, the sampler cannot collect samples. The sampling process cannot meet the sampling requirements, and the samples lose their representativeness and cause bias.

2. Since the sampler starts to rotate and sample from one side of the belt, most of the materials on the other side that are within the sampling range are pushed out of the belt or squeezed into the gap between the sampler opening and the baffle due to the displacement of the front materials and cannot be collected. , the inability to sample the full section according to the sampling requirements makes the sample lose its representativeness and cause bias

3. The opening edge of the sampler has no crushing function. During the sampling process, the larger particles touched by the opening edge of the sampler are both inside and outside the sampling range. The sampler cannot only collect within the range as required. The result is not the whole collection, but the whole Excluded, the sampling process cannot meet the sampling requirements, and the sampling loses fairness and justice, resulting in sample bias

[0003] The belt head (falling material flow) sampling machine is installed on the belt head. Its design principle is that the sampler cuts a complete cross-section of the falling material flow at a constant speed to obtain a sample. Although this sampling machine avoids the belt middle sampling machine The first and second defects of the first and second defects may also exist in the third defect, that is, the edge of the sampler opening has no crushing function, and the larger particles touched by the edge of the sampler opening during the sampling process are both inside and outside the sampling range. It is not possible to only collect within the range as required, and the result is either the overall collection or the overall exclusion. This defect not only causes sampling bias for the larger particles touched by the edge of the sampler opening, but also seriously affects the normal operation of the surrounding materials. Sampling, which causes sampling bias of the surrounding materials. When the belt moving speed is constant, the movement state of the same type of particles in the same batch of materials has regularity. When the sampler samples the flow of larger particles gathered together, this The sample bias caused by the defect is even greater, and its bias value cannot be estimated. This defect is the main reason for the sampling bias of all current sampling machines (including static material sampling machines), and it affects the samples throughout the sampling process. The normal sampling, the sampling process lost the fairness and justice, and the sampling requirements could not be met, resulting in sample bias

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