JPH05500086A - plug screw feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention improves the performance of compression type feeders for bulk materials such as wood chips Regarding the method for.

The pulp and paper industry relies on screws rotating inside cylindrical or conical cages. A compression device based on the principle of The effective volume at the inlet of the screw is larger than the effective volume at the discharge. The cage has a A hole drilled in a conical shape or for drainage of liquid squeezed out of the material being compressed. Preferably, a slot or bar is provided with one cal to do this. This case The screws are usually fitted to prevent compressed material from rotating with the screw. , a rotation stop device such as a bar, pin or slot is provided.

“U.S. Pat. A plug screen that compresses the wood chips to remove excess water and further compresses the wood chips into the plug. A lew feeder assembly is disclosed. To mechanically peel the layers from the plug, A mechanical force is applied at an angle to the plug. with adjustable choke device shaft while limiting discharge at the opening and maintaining a uniform barrel diameter. Pressure is generated in the press barrel by gradually increasing the diameter of the press barrel.

Some typical applications for such compression devices are as follows.

(1)) Pitch, wood extracts, salts and other natural substances or conveyance or processing (2) removing materials absorbed by the bulk material; (2) wood chips or other fibers; Bulk materials, such as fiber materials, are swollen during discharge from the compactor by a liquid bath or a compressor. When exposed to liquid under tension, the amount of liquid impregnated in chemical impregnation of such bulk material is (3)) extracting the liquid absorbed in the previous step, i.e. the soaking step; and (4)) pressure as it progresses from one pressure to another in a processing operation. It is to do a force seal. Conventional plug screw feeders are 1.5:1~ It has a theoretical volumetric compression ratio in the range of 2:l. Recently, 3.5・1~4.5: A feeder with a compression ratio of 1 has been designed and manufactured.

Another device called a press safina and a flare Similar equipment called inch oil presses have similar uses and are usually 6: It has a theoretical compression ratio of l or higher.

U.S. Pat. However, this feeder has a plug screw feeder. In one section the fluid is forced out of the wood chips and in the next section of the plug screw feeder. An impregnating liquid is added to the high consistency wood chips. Also, this device discloses the use of a conical formation on a rotating shaft. of conical structure The exterior surface is in close proximity to the interior of the chamber, allowing the compressed material to plasticize in restricted areas within the chamber. Perform gushir. Although Figure 1 of this patent discloses a screw feeder, The screw feeder forces the wood chips into the plug screw feeder chamber. It is not designed to be used as a sea urchin.

In the process of chemical impregnation of chips, products may be produced as a result of improper penetration of chemicals into the chip. It is common knowledge that the quality of the product becomes poorer and the yield decreases further. plug screw Given the inefficiency of feeders, many are looking for more uniform chemical addition to individual fibers. resorting to shredding chips before attempting chip impregnation to achieve Yu If the chips are chemically treated in a high-yield manner before defibration, the resulting fibers are Indicates wet web strength and requires increased energy to reach a given degree of freedom. It will be done. When defibration occurs before chemical treatment, the wet web properties are enhanced and a given freedom is achieved. The energy required to achieve the desired temperature is reduced.

Using high compression equipment on the chips before chemical treatment of the chips can result in Wet web properties up to a certain degree of freedom are retained, resulting in lower energy consumption. Ru. As a result of the high compression of the chip, fiber dislocations occur along the Sl/S2 fiber wall and increase It is believed that it provides a large specific surface area, resulting in improved pulp properties. Also, A break and a sharp break occur in the tip, which allows sufficient penetration of the chemical into the tip. Becomes Noh. High-yield methods such as chemically fired mechanical pulping (CTMP) are particularly Compared to the acid salt method, BOD, COD and Reduces the amount of effluent containing toxic products, but nevertheless CTf Process effluents are extremely toxic, and many pulverizers There is a problem with not meeting the material allowance. One of the most toxic effluent streams is This is a pressed product from a plug screw feeder. High compression ratio plug screw By using a membrane filter, - the membrane effluent stream can be treated separately. It is possible to extract highly concentrated effluent streams.

Various uses of plug screw feeders create pressure between the chamber and the shaft support flights. Contains many mechanisms that produce force. The inner diameter of the chamber may be cylindrical, conical, or It may have a limited area. Diameter of the shaft or diameter of the flights on the shaft All of these characteristics, along with the variation of processing in plug screw feeders, This results in a change in the pressure exerted on the wood chips or other materials being used. Pragsk The screw feeder chamber is used by this plug screw feeder to expel excess water. It is used for refining wood chips, removing excess fluids and purifying them. Depending on how it is used, it may consist of a bar, a screen, or be integrated into There may be. In various applications, the pressure and throughput may vary depending on the room air gap, room restriction , shaping of shafts or flights, and torque applied to screw feeders limited by. The applicant has discovered that in many applications the plug screw The improved efficiency and processing power of the printer allows wood chips or other materials to be plated under pressure. It has been found that this can be achieved by feeding to a gas screw feeder.

Several companies have attempted to construct high performance, high compression plug screw feeders. However, many problems arose. First of all, the true compression ratio is much smaller than the theoretical ratio. The unit was clogged due to the rotation of the plug.

The theoretical compression ratio of a plug screw feeder is the initial enclosing pocket in the inlet zone. or the volume of the flight interval to the last enclosing pocket or flap in the discharge zone. It is divided by the volume of the light spacing. Why the actual compression ratio is not equal to the theoretical value (1) improper line of the inlet zone, and (2) inversion from the compression cone to the inlet region. It is considered to be a flow.

In addition to the above, as a result of the rotation of the tip plug, the Wood chips, which are non-uniform materials, have a packing density that is approximately 1/2 that of solid wood chips. have. For example, in the case of spruce wood, the bulk density of the chips is approximately 121 bs/ft. It is. As a result of manufacturing tests, a typical plug screw feeder has a When using a packing density of 21 bs/[L, it has 60% of its theoretical capacity. .

Many attempts have been made to improve the filling and feeding of plug screw feeders. It has been. A variety of species, including pie breaks and the use of rotary paddles and stirrers. Similar inlet chute designs were tried. However, all of these devices Gravity is primarily relied upon to fill the cru inlet zone.

In an effort to reduce backflow problems and increase conveying efficiency, U.S. Pat. ．． A rotation stop device similar to that described in No. 452 was tried. These devices have performance However, the actual value of these effects was less than 10% of the theoretical value. Didn't improve Moreover, the packing density is not affected by the classification of chip size and its uniformity. Because it is a control variable, the effective compression ratio can be predicted and controlled under given circumstances. It is virtually impossible.

The compression apparatus for bulk materials, such as wood chips, of the present invention is Eliminate the limitations of improper and/or unpredictable inlet filling. Compressor input Change forced feed screw to the mouth forces the material into the inlet part of the compression device acts like a supercharger 1, thus increasing the Provides uniform packing density. Also, a well-filled inlet can be reversed from the compression cone. prevent flow. In this case, sufficient compression of the screw is effective to work on the material, thus to increase the effective compression ratio.

One embodiment of the invention includes an inlet and a screw acting within a cylindrical or conical cage. and an outlet, the volume of the space available at the entrance being larger than the volume of space available at the exit. In compaction equipment for bulk materials, such as hardwood chips, the bulk material is compressed under pressure. The present invention relates to a compression device characterized in that supply means is provided at an inlet of the compression device.

In another embodiment of the invention, a hand is provided for supplying the bulk material under pressure to the inlet of the apparatus of the invention. The stages may be under variable pressure.

In yet another embodiment of the invention, a variable speed force feed screw controls the inlet pressure. used for

Another embodiment of the invention provides a method for compressing bulk materials such as wood. The material to be processed is fed under pressure to the inlet of the compression device, and the material is actuate the cru and have a larger volume at the inlet than at the outlet Relating to a method characterized by:

In one embodiment of the method, the means for supplying the compressible material is compressible to the compression device. It is variable to give different supply pressure horns.

In yet another embodiment of the method, a variable speed controlled feed screw is connected to the compressor. used to control the inlet pressure of compressible materials to

Force feed screw is feeding variable speed drive. In addition to forced feed screw By adjusting the torque applied, the packing density is influenced, thereby increasing the compression The compression ratio of the feeder can be adjusted to meet the requirements of the method.

By increasing the torque acting on the forced feed screw, the following can be achieved 1h (4) 6. It was acknowledged that it would happen.

(1) The amount of power required for the compression device increases.

(The amount of extraction from the two axillary bodies increases.

(3) The dryness of the material exiting the compaction device is increased.

(4) The degree of disintegration of the material increases.

FIG. 1 is a schematic diagram of a plug screw feeder. As you can see in Figure 1, the plastic The goose screw feeder 1 includes a power source 2, a power drive shaft 3, a transmission device 4, It is composed of a screw drive shirt l-5 and a screw 6, and these components All elements are interconnected. The screw 6 is a compression cone or cylinder 7 surrounded within. This compression cone or cylinder 7 has a screen plate 8. During compression and concentration of bulk material, liquid is discharged through this screen plate 8. It will be done. The plug screw feeder I has an inlet housing 9 and an outlet housing 1 It has 0. The inlet housing 9 has a forced feed tube inside the forced feed cylinder 12. A cru 11 is provided. The forced supply cylinder 12 is located under the surge bottle 13. It is located in The forced feed screw 11 is controlled by a variable feed screw by a drive shaft 14. It is attached to the cru power source] 5. The outlet housing 10 has a discharge chamber I6 and a discharge chamber I6. output pressure L] 17, and a fluid damper, that is, a blowback damper 18. plastic The goose screw 6 starts at a point 19 close to the inlet housing 9 and starts at a point 19 close to the inlet housing 9. The volume is reduced to the smallest volume flight or pocket 20 adjacent to the group 10. consists of a series of flights or pockets. Compression cone or cylinder 7 A series of rotation stop pins 21 are provided in the wall.

In operation, compressed material is loaded into the surge bottle 3 and force feed cylinder 12.

Activate the dynamic J source 2, rotate the plug screw l, and press the inside of the compression cone or cylinder 7. begins to compress a compressible substance. Turn on the variable feed screw power source and turn on the feed screw. The compressible material is pushed into the maximum volume flight pocket 19 by the cru 11. continue. Controls the power source 2 of the screw plug 1 and the variable supply screw power source 15 By doing so, the large-volume flights 19 and Controls the compression of compressible feed into subsequent flights.

Heisei Year Month Day

Claims (6)

[Claims] 1. having a material inlet and at least one outlet to remove excess fluid from the material In plug screw feeders for processing or refining materials, characterized in that it comprises means for feeding the material under pressure to the inlet of the plug screw feeder; Plug screw feeder. 2. characterized in that the means for feeding the material under pressure to the inlet of the compression device are variable A plug screw feeder according to claim 1. 3. The means of feeding material under pressure to the inlet of the plug screw feeder is a forced feed switch. The plug screw piece according to claim 2, which is a screw. Da. 4. having a material inlet and at least one outlet to remove excess fluid from the material Improve yield of plug screw feeders for refining or refining materials. In the method of raising The method is characterized by a step of feeding the material under pressure to the inlet of the plug screw feeder. How to make it a sign. 5. Variable feeding device for feeding material under pressure to the inlet of the plug screw feeder 5. A method according to claim 4, characterized in that a method is used. 6. The means of feeding material under pressure to the inlet of the plug screw feeder is a forced feed system. 6. The method according to claim 5, characterized in that it is a cru.