SU868430A1 - Heald sample taking device - Google Patents

Description

(54) DEVICE FOR SELECTING SAMPLES

The invention relates to devices for sampling tailings washing (hali) on dredges and other washing devices and may find application in the control and study of the process of enrichment of metal bearing sands. A device for sampling gali from a stream of washed material is known that contains a baking sheet, is placed on the belt of a moving conveyor, and a sample receptacle. Sampling is carried out under a pebble tray at the time when the flow of the GO material has passed through the crossbar. For unloading the sampled sample into the receiver, it is necessary to stop the conveyor and manually unload the cut material from the baking sheet. These drawbacks can be eliminated by using mechanical devices for sampling and delivering them to the sample receiver. The closest in technical essence and achievable effect to the present invention is a device for sampling gali containing a drum screen, a bucket sampler and a sample receiving hopper. The sample is taken at the time of transferring the galy from the pebble tray to the conveyor belt. A pebble tray connects the outlet end of the barrel to the conveyor. It is installed obliquely at an angle of 30 and narrowed at the place of unloading of the gali. The OPS device provides for a one-time replaceable and daily sampling mode, which can be carried out manually and automatically, for which logical sampling control units, contactless limit switches, signaling units and actuators are included in the system. When a command is taken to take a sample, the bucket is introduced by a pneumatic actuator into the flow of a gap falling from a pebble tray onto a conveyor belt. After filling the bucket, the level sensor is triggered. 3, which commands the output of it from the flow zone of the halo flow. When an infinite limit switch is triggered, the bucket stops and turns at a certain angle, due to which the material, under the action of its own weight, is discharged into the sample container. After the soil has poured out, it returns to its original position. Private sampling can be carried out at specified intervals. For this purpose, a device incorporating a bucket sampler in the work according to the set program 2 is built into the network of the turned gearbox. A disadvantage of this device is that it does not allow a representative average process sample to be presented with sufficient accuracy. This is due to the fact that when sampling gali with a bucket under the guide tray, a dumping product is removed from the sampler and the mineral zedzenals are divided into a heavy and light fraction in the stream due to the different trajectory of their movement. Non-uniform material moves along an inclined constricted pebble tray segregated. This causes a loss of flow uniformity in the cross section and, as a result, also reduces the accuracy of testing. In addition, the bucket sampler is often out of order due to breakage of boulders and large pieces of hali of the hinge points of the bucket with a mechanical arm. The purpose of the invention is to improve the accuracy of testing and preventing the bucket sampler from mechanical damage. This goal is achieved due to the fact that a sampling device for sampling, containing a drum screen, a bucket sampler and a sample-receiving bunker, is equipped with an Otkid1.1M bottom mounted motor, and the bucket sampler is rigidly mounted in a drum screen. Fig. 1 shows a diagram of the proposed device: on .2 is section A-A in Fig. 1, The device for sampling contains a bucket sampler 1 rigidly fixed in the screen 2, transporting tray 3, made with a hinged bottom 4, the Tray performs reciprocating motion along a rigidly fixed guide chute 5, which has an empty part at the unloading station; 6) At the upper point of attachment of the chute, it also has a hollow section - slot 7, to prevent it from being filled with pebble material. The guiding chute is fastened with the help of angles at two points: to the landing platform of the stacker 8 and the metal plate 9 to the housing of the irrigation pipe 10. The drive of the transporting tray consists of an electric motor 11 with a worm shaft coupling 12 with a nut 13 fixed to the side transport tray. The drive of the transporting tray is activated by means of a time relay installed in the center of the electric tray player. The motor stops and reverses at the loading and unloading points of the material by end switches 4. The nozzles 15 are installed on the irrigation pipe to clean the metal surface of the bucket and the tray, as well as to enable the selection of wet materials. The tray is further cleaned when unloading the material into the sample receiving hopper 16 water from the irrigation pipe I 7 with nozzles 5, the Device operates as follows. During the rotation of the screen 2, the bucket sampler 1, rigidly mounted perpendicular to the flow of the sample material, crosses the washed material of the hali. The sample taken by the bucket rises up and the material due to its own weight and the water supplied under pressure from the nozzles 15 is discharged from the bucket to the transport tray 3. The limit switch in the motor 1I circuit and the sample of the moving Tpant are activated by the selected sample: the best gutter

5 to the place of unloading it into the receiving bunker.

When a tray enters the hollow area (slot 6), the bottom of the tray is discharged by the action of its own weight, and the end switch 15 turns off the electric motor 11 and the material enters the sample-receiving hopper 16. Cleaning the metal surface of the transport tray is subjected to additional cleaning with water supplied under pressure 1 ATM from irrigation pipe J7 with nozzles.

The sampling interval is set using a time relay.

The DPJ Sampling Device

Known

Proposed

The data in the table show that the proposed device allows to achieve high accuracy and representativeness of samples with a slight variation in the average values of the experimental data. The relative error in determining the gold content in the gale when sampling the supply to the device was reduced compared to the known average of 25%.

Claims (2)

1. Handbook for the development of placers. M., Nedra, 1975, p.516. 2. Enrichment of gold-bearing sands and conglomerates. M., Nedra, 1975, p. 246-247.