SU894524A1 - Device for measuring loose material humidity - Google Patents

Description

one

The invention relates to a measurement technique, in particular to electron moisture meters for bulk materials with sampling devices, and is intended to measure the moisture content of bulk materials, including the number of bulk materials, regional adhesion properties and corrosive action of flow.

An automatic device for measuring the moisture content of bulk materials is known, comprising a capacitive sensor with annular electrodes, a storage bin, a pneumatic actuator gate, a section to the storage bin and a sensor, a measuring unit electrically connected to the capacitive sensor, and a control unit.

The bottom of the sensor is made in the form of an elastic membrane mounted on a rotating frame. A vibrator connected to the membrane is also mounted on the swing frame. According to the corresponding signals of the control unit, a vibrator is driven to compress the sample, and when the sensor is emptied, its bottom 1 is tilted.

However, the use of this device on a continuous stream is unacceptable, because with a change in humidity the flow of material is interrupted, and devices are required to transfer the material to the receiver and release it to return the material studied to the stream. In addition, such devices have a large error due to the appearance of vibrosegregation — product separation into fractions. This phenomenon is observed when using vibrating compaction.

Closest to the present invention is a device for measuring the moisture content of bulk materials, containing a carriage with a throat, on which

f5, the cuvette is installed, the screen is located in the plane between the cuvette and the throat, the seal with the humidity sensor located coaxially with the cuvette and the throat, the measuring unit and

20. The control unit. The carriage, the flap and the gasket are actuated by the pushers, the flap pusher being fixed on the bottom of the carriage, which moves in the direction of the cich. The guides for the flap are end; the surfaces of the cuvette and the neck. The whole device is fixed on the wall chute, in which there is a window for the passage of the carriage with a cuvette fixed on it inside the chute for sampling

30 of a vertically kicking stream of material. Thus, the carriage with a cuvette serves as a 2J catcher. The drawbacks of the device are that when sampling a cuvette, a flap and a pusher get into the material flow along with the carriage, besides, the carriage’s translational motion is carried out in guides, which, like the carriage pusher, are in close proximity to a falling material flow, resulting in control of the moisture content of bulk materials, which have a strong adhesive capacity, which is enhanced by sharp fluctuations in moisture content and temperature of the bulk material, the device quickly arrives um inoperable state. The purpose of the invention is to increase the reliability and expansion of the field of application of the device for measuring the humidity of bulk materials. The goal is achieved by the fact that a device for measuring the moisture content of bulk materials, containing a measuring unit, a control unit, a compactor with a humidity sensor, a safety device, a cuvette, a movable bottom flap located under the cuvette, and driving devices kinematically connected with a compactor, the bottom damper and catcher, mounted on the wall of the case, additionally introduced a reset device, fixedly mounted above the catcher, and two vertical support shafts with levers pivotally connected / with actuating devices , Wherein the first shaft is fixed to the bottom of the damper on the second arm of the second shaft cantilevered catcher formed by a portion of a flat ring with the side walls. The free end of the catcher with the second damper fixed on it is passed through the window of the housing wall, while the safety device has an opening, in the initial position, located in front of the ejector, coaxial to the compactor, and fixedly fixed under the safety device to the cuvette. Driving devices The compactor of the catcher and dampers and levers connecting them to the first and second bearing MPi shafts are placed in a hermetic casing and passing through the bottom wall of the casing of shafts and stem, through which the sealing is connected to its actuator , there are gland seals. In addition, the device is equipped with a funnel for returning the material stream placed under the cuvette. The support shaft, on which the safety device is fixed, is located in the plane of the housing wall, and the centers of the circumference limiting the safety device are located on the shaft axis. FIG. 1 shows a device for measuring the moisture content of bulk materials; in fig. 2 shows section A-A in FIG. one; Fig, 3 is a view In figure 1; in fig. 4 is a view of C in FIG. 1. A device for measuring the moisture content of bulk materials contains a seal mounted on a pneumatic puller 1 with a capacitive sensor 2, a safety device 3 as a part of a flat ring with side walls, a fixedly fixed cuvette 4 with a movable bottom 5. The compactor 2 can enter the cuvette 4 through the catcher hole 3. The measuring electrodes of the seal are electrically connected to the measuring unit 6. The safety device is cantilever-mounted on the lever 7. The levers 8 and 7 are rigidly fixed on the shaft 9, and the second end of the lever 8 is hinged to the pneumatic rod an axle 10. The movable bottom 5 is fixed on the shaft 11. The bottom actuator 5. is a pneumatic rotator 12, the rod of which is pivotally connected to the lever 13, the second end of which is rigidly fixed on the shaft 11. The control inputs of pneumatic actuators 1,10 and 12 of the measuring unit 6 associated with control unit 14. A reset device 15 is fixed to the cuvette over the safety device. A funnel 16 is installed under the cuvette to return the sample to the stream. The entire measuring device is separated from the vertically feeding material flow by a wall 17 with a window for passing the catcher. The shaft 9 is located in the wall section 17, and the centers of the circles bounding the safety device 3 are located on the axis of the shaft 9. Thanks to this arrangement of the shaft 9 and the catcher shape, a sample can be taken from the center of the flow, and a window in the wall can be made which minimizes the aspiration of the sample from the stream into the device for measuring humidity. A flap 18 is fixed at the free end of the catcher. The pneumatic pushers 1, 10 and 12 and the levers 8 and 13 can be closed with a dust cover 19. Glands 20-22 are installed at the points where the shafts 19 and 9 and 11 are located through the casing. The device works as follows. Initially, the seal 2 is in the upper position, the bottom 5 closes the bottom of the cuvette 4, the opening of the catcher 3 is between the seal and the cuvette, and the valve 18 closes the window in the wall 17. By means of the signal from the control unit 14, the pneumatic actuator 10 pushes the safety device 3 through the window 17. After filling with the material, the safety device returns to its original position, and the material is poured into the cuvette 4 through the hole in the safety device 15, and the excess into the funnel 16. At the next signal from the control unit, the pneumatic actuator 1 leads The seal 2, which compresses the material in the cuvette 4.

After the compaction time, the value of which is determined for a particular material empirically, the control unit turns on the measuring unit b and moisture is measured. After the measurement is completed, the pneumatic rammer 12, turning the bottom 5, opens the cuvette 4 from below and by repeated movement of the compactor 2, the material is pushed out into the funnel 16 located above the conveyor belt. After this, seal 2 and bottom 5 return to their original position and the measurement cycle ends.

The duration of the individual phases of the measuring cycle, as well as the time of filling, compression, the pause between cycles, the moment of switching on the measuring unit, can be selected separately in the control unit.

The device allows to measure the moisture content of bulk materials with a strong adhesive ability and corrosive action due to the fact that it minimizes rubbing surfaces in the medium of the analyzed material. The implementation of the proposed device allows to optimize the technological process of drying the finished product, such as potassium chloride, which gives a significant economic effect.

Claims (2)

Claim 1. DEVICE for measuring moisture content of bulk materials, comprising a measuring unit, a control unit, a compactor with a humidity sensor, a safety device, a cuvette, a movable bottom valve, located under the cuvette, and fused devices, kinematically connected with a compactor, a bottom valve and a catcher, mounted on the case wall, distinguished by e. so that, in order to increase the reliability and expand the field of application, a reset device fixedly mounted above the safety device, and two vertical arms porous shaft with levers pivotally connected with driving devices, with a bottom flap attached to the first shaft, a safety device mounted on the second lever of the second shaft, made in the form of a part of a flat ring with a side wall. the damper is passed through the window of the housing wall, while the safety device has an opening coaxially to the seal. 2 .. The apparatus according to claim 1, characterized in that the support shaft, on which the safety device is fixed, is located in the plane of the housing wall, and the centers of the circles bounding the safety device are on the shaft axis. Sources of information taken into account in the examination 1. USSR author's certificate No. 239G11, cl. G 01 N 27 / 0-4, 1967. 2, USSR Author's Certificate ff 617710, cl. G 01 N 27/04, 1976 (prototype).