SU971975A1 - Scraper for drying paper-making machine - Google Patents

Description

(54) DRILLS FOR DRYING CYLINDERS OF PAPER MACHINE

one

The invention relates to the pulp and paper industry and can be used for installation in the drying sections of paper-boarding machines for the automatic removal of dust and fibers from them, for automatic filling of the web and for blowing stagnant zones between the drying cylinders.

A scraper is known for cleaning paper dust, fibers, etc. of rollers, shafts and cylinders of a papermaking machine, which consists of a suction tube connected to a plate on which the scraper blade holder is attached. The suction channels communicate with the pipe through the holes, the cross section of which is regulated by the scoop. The suction nozzle formed by the inclined wall with the holder is divided along the length by the ribs. All foreign inclusions are output by means of an endless flexible tape having openings, the number and length of which correspond to the number and sizes of nozzles. The belt moves along the length of the scraper (across the paper machine axis) 1.

The disadvantage of this scraper is the complexity of the design.

Closest to the invention is the design of the scraper, comprising a housing with rear and upper walls and a blade opposite the rear wall. In operation, the scraper from the rotating cylinder, by cleaning the surface with a blade, removes dust, paper fibers and other particles that are sucked through the receiving slit of the chambers connected to the tubular body in which the vacuum is created. Nozzles with outlet openings facing away

10 housing ejecting air helps to remove dust into the body cavity. To periodically blow off the pieces of cloth, nozzles are used, the outlet openings of which are turned towards the blade, for

, 5 of which includes the supply of compressed air to a tube equipped with these nozzles 2.

The main disadvantages of the prototype are the following: the complexity of the design due to the large number of nozzles, two air distribution tubes,

Claims (2)

° fittings, connecting tubes and nozzles; having two energy sources for removing and transporting dust (a vacuum is created in the body cavity and compressed air is supplied to the nozzles); nozzles to create air ejection increase noise loads; The attachment structure of the scraper blade creates an obstacle (a step appears) on the upper surface of the blade, which prevents the free removal of dust and serves as a collection of dust on the blade of dust. The disadvantage of the prototype is also the fact that it is structurally designed so that it cannot be used for automatic filling of the web in the drying part of the machine and blowing out the stagnant zones. The purpose of the invention is to simplify the design of the scraper, expanding its technological capabilities by using the web for filling and blowing stagnant zones in the space between the cylinders. This goal is achieved by the fact that the P1Aber case for drying cylinders of a papermaking machine, comprising rear and top walls and a blade opposite to the rear wall, has a partition installed obliquely to its longitudinal axis, dividing it into two conical chambers, one of which has a longitudinal slot in the rear wall for communication with the inter-cylinder space, and the other on the blade side is provided with a series of transverse partitions installed parallel to one another at an angle to the longitudinal axis of the body between the upper shank and blade. FIG. I shows the location of the scraper in the drying section of the paper machine; in fig. 2 - scraper, cross section; in fig. 3 is a view A (top view) in FIG. 2; in fig. 4 - the same (without the top cover); in fig. 5 - scraper operation scheme. FIG. 1 shows cylinders 1, a wobbling roller 2, cloth or net 3. The scraper body is hollow, consists of a back wall 4, a base of the body, an upper wall 6 with transverse partitions 7 at an angle to the longitudinal axis of the body to provide smoother air intake from the paper dust without disrupting flows. The blade of the scraper 8 is laid on the base of the body 5 and pressed against the upper wall 6 by means of transverse partitions 7 to the base of the body. A gap is formed between the upper surface of the blade of the scraper 8 and the upper wall 6, which is divided by transverse partitions 7 into a number of chambers 9, which are connected to the internal cavity of the scraper housing. The internal cavity of the scraper housing is divided by an internal partition 10 into two independent conical chambers. On the side of the scraper housing, on the side, is an air distribution pipe 11, the internal cavity of which is divided by a partition 12, on the other hand a dust outlet pipe 13 with a flap device 14. The scraper has a support with a movement mechanism 15 and a usual support 16 for fastening. The dust outlet 13 at the junction with the scraper body is equipped with rings 17 for creating an air lock. The scraper body has pressed-in pins 18, for installation in the support, with the movement mechanism 15 and support 16. The air distribution nozzle 11 is equipped with a throttle 19. The internal cavity of the scraper housing has an internal partition 10 divided into two independent conical chambers 20 and 21. The camera 21 has at the rear the wall is a longitudinal slit 22 for communication with the inter-cylinder space. The scraper works as follows. Hot air is supplied to the scraper installed in the drying part, which is supplied to the internal cavity of the scraper body through pipe 11. The main mass of hot compressed air enters the conical chamber 21, which is formed by the internal partition 10 and rear wall 4. This cavity is made in the form of a confuser and serves to distribute hot air evenly across the width of the machine to blow the stagnant zone ("sinus) of the inter-cylinder space, which is fed into the" sinus through the longitudinal slit 22 in the rear wall 4. Equal to ernost air distribution in "sinus is accomplished by clearing configuration converging tube and adjustment of the longitudinal slit. The second conical chamber 20 is made in the form of a diffuser and is finally connected to a dust extraction pipe 13, which, in turn, is connected to an exhaust fan or to a vacuum system. Creating a vacuum in the diffuser cavity provides suction of dust and fibers from the scraper blade through the chambers 9 and transporting them to the collection (cyclone). In order to ensure uniform air suction with dust and fiber across the width of the machine, part of the hot air entering the air distribution pipe 11 is throttled into the diffuser cavity by means of droplets 19, which serves to equalize the vacuum at the beginning and end of the chamber 20, in other words, the principle the work of the “mass-distributing conic collector with recirculation, only working not for the uniform distribution of mass across the width of the mashina, but for the uniform suction of air (Fig. 5). The air supplied to the confuser cavity, evenly distributed across the width of the drying part and the exit through the longitudinal slit into the stagnant zone (“sinus”) that forms between the felt and the upper cylinder, displaces the accumulated air-steam mixture from the stagnant zone, thereby increasing the moisture removal rate in this zone. When filling the paper web in the drying part of the machine, the scraper serves as a mechanism for the automatic transfer of the web from the lower to the upper cylinder (from the upper to the lower process of automatic refueling is easier). In this case, the inertial force of the web is transported along the blade and the upper wall of the scraper, and then comes down from the upper wall, is held by the air coming out of the longitudinal slit, and enters the converging wedge between the cloth and the surface of the upper cylinder. This is the process of automatic filling of the web from the lower to the upper cylinder. By blocking the damper device 14 and opening the full throttle 19, it is possible to blow off tissue fragments (if such a situation arises and the suction chambers are covered with a piece of fabric), as well as dust buildup in case of their formation. Claims of the Invention A scraper for papermaking masters' cylinders, comprising a housing with rear and upper walls and a blade, a rear opposite rear wall, characterized in that, in order to simplify the design of the sorber, to extend its technological capabilities by using for filling the web and blowing stagnant zones the space between the cylinders, the housing has a partition installed obliquely to its longitudinal axis, dividing it into two conical chambers, one of which has a longitudinal slit in the rear enke mezhtsilindrovym to communicate with the space, and the other side of the blade provided with a number of transverse partitions arranged in parallel to one another at an angle to the longitudinal axis of the housing between the upper wall and blade. Sources of information taken into account in the examination 1.Patent of England No. 1209359, cl. D 2 A, 1969. 2. USSR author's certificate number 564379, cl. D 21 C 3/00, 1975 (prototype). In id FIG. In id needles Air with dust and swamp Air Phage.5