SU1624310A1 - Device for taking samples from bulk material flow - Google Patents

Abstract

A sampling device for samples from the bulk flow stream is intended for use in raw material preparation departments at crushing, screening and concentration plants. The aim of the invention is to provide rapid analysis and reduce its complexity. For this, the ratio of the fractions in the sample is determined by balancing the containers with fixing the magnitude of unbalanced moments with hollow containers, when loading containers with small and large fractions of the selected sample and emptying one of the containers. This makes it possible to increase express speed and reduce the laboriousness of the service by dividing the selected sample into two fractions and determining their percentage composition directly in the process without additional transportation of the samples. In this case, the samples taken from the sample are returned to the total flow of the cargo being transported. I з, п.ф-л, 2 Il. . S (l

Description

The invention relates to devices for sampling fractions of bulk cargo and can be used in the selection in the rapid sieve analysis of bulk cargo samples, for example, being reloaded from a conveyor to a conveyor, at a crushing and screening plant.

The purpose of the invention is to provide an express analysis and reduce its labor intensity.

FIG. I shows the device; in fig. 2 shows section A-A in FIG. one.

The device (sampler) grows out of the gate 2 installed in the I heat with the possibility of its deviation around the hinge) in the vertical plane. In heat 1 above the hinge 3 is installed

protective visor 4. The opposite wall of chute 1 is made with window 5. Moreover, the minimum clearance 6 between the bottom edge 7 of window 5 and the edge of gate 2 is larger, the maximum size of a piece of cargo transported through chute 1 to the next transt or technological device, for example, on conveyor 8 with guide boards 9.

A window 12 with a gap 10 adjoins on the side of its smaller diameter a drum 12 made in the form of a truncated cone with perforation I I. Moreover, the lower edge 13 of the drum 12 on the smaller diameter side is located below the edge 7 of the estrus window 1, and the drum 1 2 on the side its larger diameter snabo to

U

with

flange 14. The latter, along its perimeter, is bolted with bolts 15 to the outer ring 16 of the crosspiece 17, which is made of corners 18, facing the drum 12, which is made self-supporting.

The axis 19 of the drum 12 to the crosspiece 17 on the side opposite to the drum 12, is attached (welded) circular plate 20, which is bolted 21 connected to the flange 22 of the shaft 23 mounted in bearings 24. The last bolts 25 are fixed to the support frame 26, At the second end shaft 23 is fixed to a block (pulley) 27 by a flexible (e.g., belt) transmission 28, which is kinematically coupled to a drive shaft 23 (not shown).

The outer ring 16 of the crosspiece 17 and the circular plate 20 with a flange 22 of the same diameter form an annular gap 29 in the end part of the drum 12 from the side of its larger diameter. From the smaller diameter side, the drum 12 is fully open.

Under the drum 12, two mirrored containers 32 and 33 are installed symmetrically with respect to the discharge edge 30 of the drum 12 and with a gap 31. Moreover, the dimensions of the containers 32 and 33 are length and width selected from the condition that the container 32 overlaps in terms of the drum 12. The bottom of the containers 32 and 33 is in the form of intersecting at an angle o (90 ° walls 34 and 35. At the same time, the acute angle Ј is symmetrical with respect to the vertical for both containers 32 and 33. The lower part 36 of the inner walls 35 is made folding with the possibility of rotation around the hinge 37 and fixing in the closed position with the latch 38.

Containers 32 and 33 are interconnected by a rocker arm 39 with a triangular groove 40 in the middle part of the rocker arm 39 with the possibility of resting this groove on the edge of the triangular prism 41. The latter is mounted with a possibility of displacement along the axis 19 of the drum 12 along the frame 42 and fixing on it (for example, adjusting screws). The ends of the rocker arm are made with screw cuts 43 and 44 and the fitting nuts 45 and 46 installed on them of the same mass (fixed) with the possibility of their movement along the screw cuts 43 and 44.

to

15

20

one

25

45

50 c3 n-55

624310 &

The lengths of the screw threads 43 and 44 and of the rocker arms 39 are chosen taking into account the mass of the representative sample of the load. Therefore, the ends of the rocker arms with screw cuts 43 and 44 can even extend beyond the outer walls 34 of containers 32 and 33. Fixing screws 49 and 50 are installed on the suspension frame 42 using brackets 47 and 48 with the possibility of their interaction with the wall 34 of containers 32 and 33. .

The sampler works as follows.

After mounting the sampler through the drum 12, samples (control) are passed through the sieving of the cargo into two fractions and filling containers 32 and 33 with them. By shifting the triangular prism 41 along the frame 42, the cargo fraction in the containers 32 and 33 is central with respect to the corners oi. 41 is fixed in the position found. After the test fractions are released by opening the latches 38 and opening the walls 36 and returning them to their original position after emptying the containers 32 and 33, screws 49 and 50 are disengaged by partially unscrewing them from the brackets 47 48. Due to this, the rocker 39 with containers 32 and 33 can rotate freely relative to the reference edge of the triangular prism 41. By corresponding rotation of the nuts 45 and 46 with their displacement along the screw cuts 43 and 44, equilibrium of the empty containers 32 and 33 is achieved. On cuts 43 and 44, respectively uyuscha zero position mark (Mark), Then the containers 32 and 33 again are fixed by screws 49 and 50.

If it is necessary to take a sample of the transported cargo and its sieve analysis (and subsequent chemical analysis), shib.per 2 in chute 1 turns around hinge 3 in half

35

40

The life shown in FIG. 1. Gate 2 is in this position for a period of time determined depending on the performance of the cargo traffic and the size of the representative sample.

Simultaneously with the inclusion of the gate 2 or in advance, the drive of the drum 12 is turned on. The torque from the flexible transmission 28 is transmitted through the block 27 to the shaft 23, and from it through the flange 22

516

and a circular plate 20 - to the crosspiece 17, which is rigidly connected to the flange 14 of the drum 12. When the perforated conical drum is fixed on the shaft 23, which rotates on the shaft 23 and slides from the gate 2 and enters the internal cavity of the drum 12, moving along the inclined perforated the surface of the drum 12, sorts it into two fractions. A small fraction (in this case, 0–25 mm), falling through hole II in drum 12, falls into container 32, rolls down to its central part (in length) and collects in the zone of the vertex of the angle p / , between the walls FOR and 36.

The coarse fraction (as applied to this case, 25-60 mm) through the ring, the lumen 29 of the drum 12 is discharged into the container 33 and, rolling down the walls 35 and 36, accumulates in the middle part of the container 33 in the area of the apex of the corner.

After the cavity of the drum 12 is completely released from the cargo sample, the drive of the sampler is disconnected and the drum 12 stops. The locking screws 49 and 50 are retracted from the walls 34 of the containers 32 and 33.

Further, by rotating the nuts 45 and 46 along the screw cuts 43 and 44, by displacing them in appropriate directions, one achieves a new equilibrium position of the containers 32 and 33 corresponding to the horizontal position of the rocker arm 39 The new positions of the nuts 45 and 46 are fixed.

After that, take one of

containers, for example, from container 32, part of a sample for chemical analysis (usually it is not more than 1 kg). Then, the latch 38 opens, the lower part 36 of the inner wall 35 under the action of its own weight and the weight of the sample is folded back around the hinge 37, and the sample located in the container 32 returns to the process, overloaded to the conveyor 8, the Wall 36 return to its original place, fixing it with a latch 38.

After that, the nut 46 is removed (screwed) from the thread 44, and the container 33 with the rest of the sample is again balanced by the nut 45, moving it further from the prism 41 along the thread 43. This is the position of the nut 45 on the thread 43

r

0 5

0

d

$ 0

five

106

fix, noting its removal from the edge of the prism 41.

Next, a cargo sample is taken for chemical analysis from the container 33, the latch 38 is opened and the rest of the sample is loaded onto the conveyor 8, and the wall 36 is returned to its original position, fixing it with the latch 38.

The percentage of the fine and coarse fractions in the cargo sample taken from the heat I to the containers 32 and 33 is determined as follows.

If the container is emptied first

32 with a fine fraction, the percentage of the fraction in the selected sample

W1l 1 o +1 oinrw

hf 27t; -tЈ 7t-y-7g; tgg | ((If you empty the container first)

33 coarse fraction, the same value can be determined by the formula

i i. . v, In + lo In +1 -1 | LL

 2 t0 7G ° tp + G-tt 100Z The content of the small fraction in the sample is calculated by the formula

In 100-p

Designations in the formulas: the percentage content of the coarse and fine fractions, respectively, in the sample; Ifl is the distance of the center of mass of the nut 45 from the edge of the prism 41 when balancing the container 33 with the coarse fraction; I and - the distance of the nut 46 in the case of the equilibration of the container 32 with the fine fraction; I, 10 - distances respectively nuts. 46 and 45 from the edge of the prism 41 upon initial balancing of the hollow containers 33 and 32; 1.1 are the distances of the nuts 45 and 46, respectively, from the edge of the prism 41 when balancing the containers 32 and 33 with the small and large fractions of the cargo sample taken.

The calculation formulas are obtained from the analysis of the equilibrium conditions of the system for the specified cases with the determination of the unbalanced moment values. The calculation results for both the first and second formulas when determining the MC are completely identical. An option is chosen that corresponds to the initial release from the cargo of the container where the cargo is larger (by visual assessment), since in this case less re-interchange of the nut is needed to balance the cargo in another container, i.e. in this case, labor-intensive operation ii is reduced, although this is not a requirement. Empty any container.

When balancing one of the congeenosis (after emptying the other), the nut from the lugs on the side of the loaded container can not be removed, but simply on it until it stops, but then the projectile must be moved 1 more distance than in the case of -1.- remove the first nut. In this case, the ij determination of the percentage ratio: i :: icru;; the pitch and fine fraction of the sample is made according to formulas that can be easily obtained from the analysis of the equilibrium condition of such a system. In the case of emptying, first of all, container 33 with a large fraction, its percentage in the sample is calculated by the formula

liiL-i +1

v 2 (c, - .0 -0

l. ± 12.

: M1aL: “. pin 2

.-a-H +1 Y + l -l 100% f

where l is the minimum possible distance - nl nuts 45 from the edge of the prism 41.

When first emptying the kiln 32 with a fine fraction, the percentage of the coarse fraction is calculated by the formula

 4 {-5gggg t- ""

The values of parameters I and 0 will differ from those in the case of the removal of the corresponding nut. At the same time, the values will remain the same.

The self-supporting design of the perforated drum 12 of conical shape with its cantilever fastening on the crosspiece 17 of the drive shaft 23 allows to simplify the design of the sampling unit, reduce metal consumption, and tightly bring the drum 12 with a minimum clearance of 10 to the transporting leakage 1. This facilitates placement of the sampler on operating enterprises . To do this, it is only necessary to cut a rectangular window 5 in heat 1 and place the gate 2 on it at the hinge 3.

Fastening receptions containers 32 and 33 at the ends of the rocker arm 39, supported in the middle part of the triangular prizmu 41, equipment of the ends of the rocker arm 39 screw thread 43 and 44

with

Q g

0

five

0

Q

with counterweights shifted in them in the form of nuts 45 and 46, it allows, without emptying containers 32 and 33 and additional overloading and weighing samples of small and large fractions, to determine the percentage ratio in the selected sample of small and large fractions. This greatly reduces the complexity of the operation and reduces the time for rapid analysis of samples of technological raw materials.

Making containers 32 and 33 mirror-wise relative to the vertical passing through the supporting edge of the triangular prism 41 reduces the size and weight of the elements of the equilibrium .4 hanging system, reduces labor intensity and reduces the time spent on the balancing operation, since in this case less time is required movement of nuts 45 and 46 on the threads 43 and 44.

The implementation of containers 32 and 33 for small and large fractions of a triangular shape in the plane of the longitudinal axis 19 of drum 12 provides for a fixed placement of the centers of mass of both fractions of the load at the same distance from the fulcrum of the rocker arm 39 — the edge of the triangular prong 41. This makes it possible and easier to solve determining without weighing the percentage in the sample of small and large fractions,

The acceptance of the internal angle of intersection of the walls 34 and 36 of containers 32 and 33 is less than 90 °, which provides, firstly, free, without jamming, the opening of the folding walls 36 when emptying the containers from the cargo; secondly, a sufficient angle of inclination of the walls 34 and 36, excluding the freezing of cargo samples and its sliding down along these walls.

Installing a triangular prism 41 on the frame 42 with the possibility of displacing the prism 41 along it and fixing the prism 4 1 on the frame 42 improves the accuracy of determining the percentage of fine and coarse fractions in the sample.

The presence of the fixing screws 49 and 50 ensures the durability of the prism 4 1 and other elements of the sampler, the safety of the service due to the rigid fixation of the containers 32 and 33 when the load is loaded into them, the unloading of one of them in the intervals between the operation of the sampler, and also

9162

The rotation of the samples 39 with the containers 32 C 33 during the balancing operations of the system by shifting no i to the threads 43 and 44 of the nuts 45 and 46.

Making the crosses 17 out of the corners, orienting their edges to the side of the drum 12, facilitates unloading a large fraction from it when one of the beams of the cross 17 is in the lower position (the cargo flow is cut by the edge of the cross 17 and is not delayed when unloaded from the drum 12).

The use of the suspension frame 42 in combination with the main support 26 makes it possible to facilitate the conditions of anchorage of the sampler in the existing production, since to install the sampler it is sufficient to place two support beams 26.

Claims (2)

Invention Formula I. Device for sampling from the flow of bulk material, including the frame, a sample extraction unit from the flow and a sorting unit of the sampled sample for ten 0 five ten fractions and containers for collecting the selected fractions of the sample, which is different from the fact that, in order to ensure expressiveness of anacchaea and reduce its labor intensity, the sample sorting unit is made in the form of a cantilever self-supporting perforated drum of conical shape with a cross-piece for fastening the drive, the drum is installed with a smaller base in the direction of the outlet from the stream, and the device is equipped with a connecting container, made with a screw thread at the ends and located in the center of the groove of the rocker, fitted nuts of fixed mass and fixed on the frame support in the form of a triangular prism for installing rocker arms, while the containers are made in the form of triangular prisms with folding walls mirror-like located relative to the center of the rocker arm connecting them, 2. An apparatus according to claim 21, characterized in that the frame is provided with fixing screws for limiting the movement of the containers. Yu II K No. 15/7  28 27 Schig.1