SU875218A1 - Continuous-action metering-out device for wood particles - Google Patents

Description

I

The invention relates to a metering device, which can advantageously be used in the woodworking industry in chipboard production shops for metered loading of dry wood particles into mixers when sizing them with a binder.

Portion scale scales are known for loading mixers with wood particles 1.

However, the devices are structurally complex, do not provide uniform loading of the mixer, and the quality of sizing wood particles is unsatisfactory.

More satisfactory mixer performance results are obtained when loaded with continuous dispensers. The dispenser includes a hopper with a flap, a belt conveyor with a drive and a power meter with an electric regulator, a control drive of the conveyor or a hopper flap. The force weighing device either the entire conveyor together with wood particles 2, or only the section of the working branch of the conveyor using the weighing roller 3.

However, the accuracy of the dosage delivery of wood particles in such dispensers is insufficient and depends on many factors: tension of the working branch of the conveyor, interacting with the pusher roller, uneven loading of the conveyor along the length and width of the belt. In this case, in all cases, the weight of the weighing conveyor is always greater than the mass of the weighted wood particles.

ten

A continuous dispenser is known, including a volumetric pre-dispenser and a weight conveyor belt located beneath it, driven by a synchronous gear motor. Volumetric predator made in the form

15 hoppers with an output metering tube, coaxially with which a disintegrating and metering spiral is located in the bunker, and the weighing belt conveyor is completely mounted on a weight-measuring lever, with

20 a differential transformer which is electrically connected to the conveyor drive. In Taco1 4 dispenser, volume and weight dosing is combined 4.

However, when metering wood particles into the mixer, such a metering device does not provide high accuracy and disrupts the composition of particles. Dust accumulates on the conveyor belt and this worsens the operating conditions of the weighing conveyor, causing the zero point of the measuring system to shift. In addition, the weight of the conveyor exceeds the weighting of wood particles up to 10 times, it is difficult to accurately weigh. During the operation of the volumetric pre-dispenser, the disintegrating and metering spirals grind dry woody particles, changing their fractional composition. In the mass of wood particles, a high content of fine fraction and dust is formed, which negatively affect the sizing of wood particles in the mixer. In general, the dispenser has a complex structure.

The closest technical solution to the invention is a metering device containing a feed bin, a volumetric bag and a weighing mechanism, which allows weighing individual portions of material 5.

The disadvantages of it are the great complexity of the design and the difficulty of controlling the dose of the material.

The purpose of the invention is to simplify the design with an increase in the accuracy of the dosed supply of material and preservation of its fractional composition, as well as the possibility of adjusting the doses of material.

The goal is achieved by the fact that in a metering device containing a hopper with a flap, a transport device with a drive and a weighing platform with a load cell electrically connected through a regulating device with a drive, the device is equipped with a support plate with a receiver for the weighing platform and a discharge window, the transport device is made in the view of the horizontal grid placed on the base plate, and the weighing platform is placed under the grid and communicated with the discharge window.

FIG. 1 shows the dispenser; in fig. 2 - the same, top view.

The proposed dispenser for uninterrupted operation consists of a bunker 1 with a damper 2 fixed to it, a conveying device made in the form of a horizontal grid 3 connected to an adjustable inlet 4, and a weighing platform 5. The grating 3 is placed on the support plate 6 under the bunker 1. Weighing platform 5 mounted under the grille, built into the opening (Saddle pin and communicating with the unloading window 7. The weighing platform is fixed on the strain gauge load gauge 8,

electrically connected through a regulating device 9 with an adjustable drive 4. The drive 4 is fixed on the hopper 1.

During the operation of the dispenser, dry wood particles intended for tarification in the mixer are fed to the bunker, 1. Since the bottom of the bunker is the base plate 6 with the grid 3, the wood particles, supported by the plate, fill all the grid cells. When the lattice rotates with the help of drive 4, wood particles in the cells are compacted by pressure of the overlying layers of particles in the bunker, and when the lattice cells leave the hopper, the valve 2 levels the wood particles along the lattice, and the latter, when rotated, moves wood cells strictly determined by volume particles. These doses in the cells come from the supporting plate 6 to the weighing platform 5. A tensometric load cell 8 converts the weight of wood particles on the platform into an electrical signal that passes through the regulating device 9 controls the angular speed of the adjustable drive 4. At the same time, if the weight of the wood particles is the platform is less than the target, then the lattice rotation speed increases and vice versa, if the weight of wood particles in the platform is greater than the target, then the rotational speed (the lattice slows down.

As a result, the amount of wood particles transported by the grate per unit of time remains constant.

The wood particles, coming off the weighing platform, are passed through the grid cells and enter the dispensing discharge window.

In the proposed dispenser, the lattice with the simplicity of its construction serves as a conveyor, in which all zones are working, there are no idle zones. The weighing platform has a minimum working area and takes the weighing weight; particles directly without taking into account the weight of the transporting device. This makes it possible to increase the sensitivity and accuracy of the weighing platform. Preliminary volumetric dosing does not grind wood particles. The loading / dispensing scheme of the dispenser is simplified, the weight of the dose of particles is controlled. (

Thus, the use of the proposed metering unit for loading wood particles into the mixers will improve the metering accuracy and preserve the fractional composition of the feed material while simplifying the design of the metering unit .;

Claims (5)

The economic efficiency in equipping the proposed high-speed mixer dispensers in chipboard production shops amounts to about 561.7 thousand rubles. in year. DETAILED DESCRIPTION OF THE INVENTION A continuous dispensing device for wood particles comprising a hopper with a flap, a transporting device with a drive and a weighing platform with a force meter electrically connected to the jie-, a cutting device with a drive,. characterized in that, in order to simplify the design and increase the accuracy of the material dosing and preservation of its fractional composition, as well as adjusting the material doses, the device is equipped with a base plate with an opening for the loading platform and a discharge window, placed on the 6th base plate, and the weighing platform is placed under the grate and communicated with the unloading window. Sources of information taken into account during the examination 1. German patent N 2166625, cl. B 01 F 7/02, B 293 5/02, 1976. 2. For the UK N 1473501, cl. G 01 G 19/24, 1977. 3. For Germany of Germany N 2529626, cl. G 01 G 11/00. 1977. 4.Galperin F.S. Main trends in the development of weighing batches of continuous deistvI. TSNIITEIpriborostroenn. Survey nor formation, M., 1977, E. 26, 47, Fig. eleven. 5. USSR author's certificate N 224832, cl. G 01 F 13/00, 1965. / || ---- H II ; lilfeJL.  ///////// 4 /// ////////// // // l / П -Г // f, a l  . " 0ig.hg- / n FIG. 2 Z