SU1000834A1 - Laboratory sample preparation device - Google Patents

Description

(54) DEVICE FOR PREPARATION OF LABORATORY

Test

one

The invention relates to a technique for preparing samples of bulk materials and can be used in the coal, construction, mount-metal and other industrial sectors.

A device for the preparation of laboratory samples is known, which contains a belt feeder, a hammer crusher, a chain cutter, a sample divider, a sample receiver l}.

A disadvantage of the known device is that it does not provide for it. to clean the internal cavities after preparing the sample in order to disinfect the subsequent sample from the previous one, to aspiraya dusty air from the device during operation and to return the reduced part of the material of partial samples back to the process. And the use of standard means (conveyors, feeders, etc.) for its return is not always possible and advisable in view of bulkiness, and the reduced material should be directed to lower

The process level located is also not always possible.

The purpose of the invention is to demonstrate the representativeness of the samples by cleaning the internal cavities of the device’s singing elements (crusher, cutting machine, dosing unit), increasing the reliability of work and improving working conditions.

This goal is achieved by the device for preparing laboratory samples containing a feeder, a crusher, a contractile, a sample divider, a sample receiver and a support frame, equipped with a discharger connected to the feeder by a conduit, a screw feeder connected to the contractile and nozzles located in the cavity crushers and cutter, the feeder is made in the form of an ejector and is connected to the compressor.

It is advisable to use a contracter in the form of a case with two chutes, fitted with a damper in the case and a rotary valve or gum, and a discharger in the form of a cyclone and a bag filter connected to it. In addition, the sampling receiver is equipped with a pneumatic cylinder, which guides with a two-position holder and a choke to exit the air mixture while purging the device. va. FIG. 1 shows the proposed device, a general view; in fig. 2 is a view along arrow A of FIG. 1. The device consists of jaw fraction 1, a contractile 2, a screw metering device 3 for metered container loading, a sample receiver 4, and a pneumatic transport device for an abbreviated sample material that has a batch feeder 5 ezek. a torus type and a discharger 6 for separating and cleaning compressed air from the transported material at the place of discharge. Crusher 1, contractor 2, dispenser 3, sample receiver 4 and feeder 5 are installed in frame 7. Contractile 2 is installed under crusher 1 and is complete in the form of body 8c with chutes 9 and 1O, rotary valve 11 located in body 8, and pneumatic cylinder 12 for turning the flap 11. A screw feeder 3 with electric drive 13 is attached to the chute 1O. Receiver. Samples 4 are attached to the dispenser 3 and are made in the form of a pneumatic cylinder 14, a guide 15 with a two-position ferrule 16 in which the sample container 17 is installed, and a fitting 18 for removing the mixture while purging the common cavity of the device. The feeder 5 of the pneumatic conveying device is attached to the leak 9 and is made in the form of an ejector with fittings 19 and 20 for supplying compressed air. Discharger 6 includes a cyclone 21 with an inlet fitting 22 and an exhaust pipe 23 and a filter 24 located on the exhaust pipe 23, made in the water of the base 25 of the filter fabric sleeve 26 and the casing 27 in which the collector 28 is located with nozzles 29 for regenerating the filter sleeve 26 compressed air. . The output of the feeder 5 and fitting 18 connect. There are no pipelines 30-32 through the tee 33 with the cyclone 21 inlet 22. In the cavity of the crusher 1 and the flow iO-, nozzles 34 and 35 are installed to clean the common channel of the sample through the device with compressed / air blow. The device works as follows. Before entering a partial sample, the crusher 1, alternate compressed air supply in the cavity of pneumatic cushion 12 and compressed air supply through valve 19 and 20 into the feeder cavity 5 are simultaneously turned on. Incoming partial material sample is crushed to crusher 1 to a predetermined size and at the contraction 2 is reduced to a predetermined amount. The reduction of the crushed partial sample is carried out by short turns of the valve 11 at a certain angle using a pneumatic cylinder 12 with a predetermined frequency and holding the time in the extreme positions. In this case, the valve 11, being in one of the extreme positions, directs the flow of material into the chute 9 or 10. In the chute 1O, the sample accumulates, and through the chute 9 the reduced material enters the feeder 5 and mixes with the compressed air. Formed: a with a mixture on the mater {; Along the ZO and 32 passes through the inlet 22 to the cyclone 21, where the transported material is pressed by the centrifugal forces against the walls and, the loss in speed, flows down, for example, on the conveyor belt, and the air flow turns up and through the exhaust pipe 23 through the open bottom the end of the sleeve 26 enters its cavity, is filtered and is removed to the outside. After processing a part of the 1st sample, the crusher 1 is turned off, the alternate compressed air supply to the cavity of the pneumatic cylinder 12 and the compressed air supply to the feeder 5 is stopped alternately before the next partial sample enters. After processing a predetermined number of partial samples to accumulate a given sample mass, the electric drive 13 is turned on and the accumulated sample from the chute 10 is discharged by the screw of the dispenser 3 into the sample receiver container 17. After unloading the sample, the electric actuator 13 turns off and turns on the compressed air supply to the pneumatic cylinder 14, the rod of which moves the choke 1c to the place of: container 17 (loading position), and the container 17 returns the holder 16 to the free position, which is removed by the operator and replaced with an empty one. When the nozzle 18 is in the loading position, the compressed air is supplied to the nozzles 34 and 35, and the total cavity of the device is cleared of sample residues to ensure representative subsequent samples, and the material formed with the aerosol through the conduit 31 is removed to the discharger 6 for cleaning.

After cleaning the common cavity of the device, the compressed air is supplied to the 34 and 35 npejapamaror nozzles 5, the container 17 returns to the loading box and compressed air is turned on to the manifold 28 with the nozzles 29. The filtering tube 26 0 is regenerated by an air jet blowing method. A seeding layer of dust on the inner surface of the sleeve 26 is destroyed and dumped down through the cyclone 21. After regeneration, the supply of compressed air to the collector 15 is stopped, and the cycle of operation of the device ends.

The use of the proposed device will make it possible to increase the representativeness of the samples by cleaning the common cavity of the device by blowing compressed air from the nozzles after each cycle. In addition, manual labor is excluded when returning reduced material to the process or cumbersome25

devices for this purpose, reliability of work, production culture, improved working conditions due to an automatic device of pneumatic transport.

In order to prevent the unit from forming during 30 hours of operation of the device, it will not enter the environment, along with the pneumatic transport of the reduced material, dust is suctioned by sealed magnetic materials, c. -.35 ends of which have a cyclone with a filter for unloading the material and trapping the pti. Material lines, as a rule, do not occupy a useful production area, allow gaskets- .40

vat them in any convenient place and do not have moving parts like a feeder and filter cyclone.

Claims (3)

1. A device for preparing laboratory samples containing a feeder, a crusher, a contractile, a sample divider, a sample receiver and a support frame, characterized in that, in order to increase the representativeness of the samples, operational reliability and improve working conditions, it is equipped with a discharger connected to the feeder With the help of a material pipeline, a dosing unit connected to a contractile and nozzles located in the cavity of the crusher and a contractile, the feeder is made in the form of an ejector and connected to the contractile. . 2. The device according to claim 1, that is, so that the contractile is made in the form of a housing with two chutes, equipped with a rotating valve located in the housing and a pneumatic cylinder. 3. The device according to claim 1, in connection with the fact that the discharger is made in the form of a cyclone and a bag filter connected to it. 4, The device according to claim 1, so that the sample receiver is equipped with a pneumatic cylinder, sent with a two-position holder and fitting for exit of the air mixture when purging the device. Sources of information | 1ats taken into account during the examination 1. Bratchenko B. F. The equipment for the enrichment of coal. M., 1979, p. 281, Ml bi TH 7 Fi1.2.