SU937227A1 - Method and apparatus for glue-sizing of wooden shavings - Google Patents

Description

(54) METHOD FOR GLUING WOOD CHARS AND DEVICE FOR IMPLEMENTING IT

one

The invention relates to the production of chipboard, in particular to methods of sizing wood chips.

There is a known method of sizing wood chips in a high-speed mixer by forming a chip ring rotating and axially movable with the subsequent introduction of a binder into it. The chips and the binder are fed to the mixer metered 1.

There is also known a method for sizing wood chips, which includes an adjustable feed of chips and a binder to the mixer, followed by movement 2.

However, known methods provide for metering wood chips and a binder outside the mixer. Therefore, in the mixer in the binder inlet zone, there is inevitably a delay in regulating the ratio between the chips and the binder. Dosing does not take into account changes in the thickness of the chip ring along the length. Inaccuracy in dosing causes excessive binder overruns and lowers the quality of the mixture.

The purpose of the invention is to reduce binder consumption and increase sizing quality.

This goal is achieved by the fact that before feeding the binder, the centrifugal force acting on the wood chips in the mixer is measured, the amount of which is controlled by the amount of the binder.

An apparatus for carrying out the method including a chip feeder with a drive,

10, a loading case, a housing with a discharge opening, a drive shaft with a channel for supplying a binder and nozzles and blades fixed to it, as well as a device for feeding a binder with an electrical control system, is equipped with a drum, which is mounted on the drive shaft between the loading case and body, and the latter in the area adjacent to the drum is made with windows around the circumference, in which strain gauges are placed

20 sensors connected to the binder supply electrical control system.

Claims (2)

FIG. 1 shows a diagram of a mixing device; in fig. 2 shows section A-A in FIG. 1. The mixing device includes a feeder chip B form of conveyor 1 driven by an electric motor. Under the feeder is installed boot casing 2 and the cylindrical body 3 of the mixer with the discharge opening 4. In the case, coaxially with it, passes the shaft 5, mounted on bearing supports and equipped with a pulley 6, which is connected to the drive belt. The shaft has a channel for supplying the bond and its nozzles 7 are rigidly fixed on it, mixing the blades 8 and the drum 9, which is hindered between the charging jacket and the housing. In this case, the drum is made cone-shaped, the flow rate is in the direction of the body and fixed on the shaft with the help of rods 10, which act as loading blades. In the walls of the housing 3 in the gap between the drum 9 and the nozzles 7, windows 11 are provided, into which the loading elements 12 of the tensometric dynamometers 13 mounted on the housing are inserted. The channel of the shaft 5 for supplying the binder is connected by pipeline to a pump 14, the drive of which is adjustable and electrically connected with the controller 15, the setting device 16 and the strain gauge dynamometers 13, which form the pump capacity control system. The method of sizing wood chips in the proposed device is implemented as follows. Wood chips conveyor 1 continuous flow loaded into the boot casing 2. From the casing chips fall into the drum 9, which rotates with the shaft 5, receiving movement from the pulley 6. Rotating drum rods 10 and the inner walls entrains the chips into rotational motion. A rotating chip ring is formed in the drum, which due to the conical inner surface of the drum moves axially towards the mixer body 3. At the exit of the drum, the chip ring has an angular velocity equal to the angular velocity of the drum, i.e. constant speed regardless of the thickness of the ring, the thickness of the ring around the circumference is equalized. The rotating chip ring enters from the drum into the stationary cylindrical body 3 and extends along the windows 11 into which the load elements 12 of the strain gauge dynamometers 13 are inserted. The rotating chip ring has a centrifugal force whose magnitude is measured by dynamometers 13. The magnitude of the centrifugal force can be found for the mass of chips entering the nozzle zone according to the formula b, 28-T-And or.r-tp-zE where M is the particle size of the chip ring, kg / s; T - centrifugal force, H; p) is the angular velocity of rotation of the chip ring, rad / s; G the radius of the midline of the chip ring, m; cf - the central angle covering the load element of the dynamometer, glad; Z is the number of dynamometers; And - axial speed of chip ring movement, m / s; t is the length of the load element of the dynamometer, m; 6.28 - constant, equal to 2Si. Strain gages dynamometers convert the centrifugal force T into an electrical signal that acts on the regulator 15. To supply the binder with the setting device 16, set the required flow rate, according to which the regulator 15 adjusts the drive of the pump 14, and the latter pumps the binder through the shaft channel 5 and the nozzles 7 in chip ring. With a change in the mass of the chip ring suitable for the nozzles, the centrifugal force and the proportional electric signal change and the controller 15 corrects the performance of the pump 14. Mixed blades 8 of the chip come out of the housing through the discharge port 4. Approximation of the measuring mass of chips to the nozzle area allows to increase the accuracy of the batch feeding and thereby reduce the binder consumption and improve the sizing quality of the chips. Claims 1. A method of sizing wood chips, including controlled feed of chips and a binder to a mixer, followed by agitation, characterized in that, in order to reduce binder consumption and improve the quality of sizing, the centrifugal force acting on the wood binder is measured before feeding the binder chips in the mixer, the amount of which controls the amount of the binder. 2 .. A device for sizing wood chips, including a chip feeder with a drive, a loading case, a housing with a discharge opening, a drive shaft with a channel for supplying a binder, and nozzles and blades fixed on it, as well as a binder supply device with an electrical system control, implying that the device is equipped with a drum, which is mounted on the drive shaft between the boot casing and the housing, and the last one in the area adjacent to the drum is made with windows around its circumference, in which still strain sensors connected to the elec