KR20120127771A - Vibrator screen changeable screen-board angle by load - Google Patents

Abstract

PURPOSE: A vibrating screen having a load corresponding to an angular displacement screen board is provided to enhance a selection rate and to prevent screen clogging. CONSTITUTION: A vibrating screen having a load corresponding to an angular displacement screen board includes a screen(40). The screen comprises a plurality of screen boards(41) which are mutually separated. The screen boards are successively installed along the inner sloped wall of a vibration main body(20). Each screen board is fixed to the vibrating screen wall by a rotating tool(42) and a rotation angle restricting tool(43). Each screen board angularly moves within restricted angular range in the direction of an aggregate. Each screen board has a stepped pulley and a splice along an inner wall sloped line.

Description

VIBRATOR SCREEN CHANGEABLE SCREEN-BOARD ANGLE BY LOAD}

The present invention relates to a vibrating screen applied to a plant facility for sorting and producing recycled aggregate from construction waste or construction waste, and in detail, to improve screening performance by suppressing screen clogging and sedimentation, and according to load It improves the sorting efficiency by automatically adjusting the input material progress speed, and solves the unbalance of material progress speed with the upper and lower screens so that the screen can be uniformly screened in all areas of the screen. It is about.

The vibrating screen is a structure in which a flat screen board is formed to be inclined downwardly in a vibrating body equipped with a vibrator, and uniformly arranged holes of a predetermined size are formed. As a sorting device for rejecting materials that do not pass, they are used in various fields that require separation of materials by size.

Vibration screens used in the construction and recycling of construction waste or construction waste materials (hereinafter referred to as construction waste) are utilized in pre-screening or post-screening processes.

Pre-screening is used to separate and sort aggregates to be recycled from landfills, or to crush, separate, and sort them to recycle construction wastes for subsidiary bases, bases, concrete, or asphalt concrete. It is used for the purpose of reducing the load of the post process and improving the quality of the production aggregate by separating and selecting the soil containing 30mm ~ 20mm or less foreign matter (hereinafter referred to as soil) in the plant equipment. It is a process of forming a screen having a size into a single deck to separate the soil to be discharged through the screen chute through the lower chute and the recycled aggregate (rejected material) that is discharged to the rear chute without passing through the screen hole.

Under normal conditions, since the construction waste contains large lumps, the pre-screening process is applied to the primary crushed material that is crushed to a size of about 100 mm through the crushing process using the crushing equipment. Although there are differences depending on the characteristics of the waste, in general, the primary crushed material contains about 30 to 40% of the soil containing various foreign substances, cement paste, and clay soil with high adhesion according to moisture content. As it is the cause of increasing the load and lowering the quality, the pre-screening process is performed to separate and recover the soil.

The post-screening process is the final process of recycling construction wastes, and sorts and sorts the aggregates to be recycled according to the purpose and standards of recycling.The upper screen has a hole size of about 40mm in the vibrating body and 30mm Medium-layer screens with inner and outer hole sizes, lower layer screens with hole sizes of 15 mm or less are installed in a three-layer deck structure, or upper layer screens having hole sizes of 40 mm or less in the vibrating body, and lower layer screens with hole sizes of 25 mm or more The process of sorting and sorting 4 or 3 kinds of aggregates by particle size according to the number of decks. to be.

Related issues raised in pre-screening or post-screening in the existing vibrating screen structure are as follows.

① Blockage

 The soil contained in the input aggregate at pre-screening contains 30 ~ 40% of high-adhesive clay soil according to various foreign substances, cement paste, and moisture content, and these soils, which are to be recovered and separated, are screened by screen screen blocking. The higher the moisture content of the soil, the more the hole clogging increases, which reduces the performance of the vibrating screen.

This problem mainly occurs in prescreening vibration screens. KR 10-0514605 (2005.9.6) has been designed to solve such problems. To prevent soil from being caught by the relative vibrating means for relatively vibrating the sorting plate, KR 10-0468630 (2005.01.19) consists of a damper that protrudes high information on the upper and lower ends so as to be connected to the first grid frame and the screen network, respectively. The screen network provides a means for three-dimensional vibration different from the vibrating screen body. The above structures are designed to support the screen board fixed to the vibration main body with a cushioning material (spring) while vibrating the vibration main body to increase the probability of passage of soil. When the screen board spring acts in a direction to cancel the vibration of the main body. Rather, the possibility of inducing hole clogging due to the lack of vibration force at the screen position cannot be excluded.

As another method for eliminating screen clogging, US 4,288,320 (1981.9.8), KR 10-0838259 (2008.06.09) propose a structure in which a striking rod is installed on the bottom of the screen board to strike the body when vibrating. KR 10-0528131 (2005.11.04) has a structure in which a vibrating screen plate striking member is installed at both ends thereof and is stretched in the vertical direction by vibrating vibration, and strikes the vibrating screen plate from the bottom. KR 10-0528131 (2005.11.04) -0838259 (2008.06.09) proposes a method for removing hole clogging by hitting the soil removal means arranged in a chain form on the top of the screen. These methods eliminate the blockage by directly hitting the screen. Restriction of the blockage is limited around the area where the blow is applied directly, and each device is located at the bottom or top of the screen so that aggregate, earth, cloth, vinyl, rope, etc. Various foreign matters are accumulated in direct contact with the operation unit, there is no limit to the continuous performance.

JP07241526A (1995.09.19), US 4,120,785 (1978.10.17), KR 10-0528131 (2005.11.04), KR10-0364439 (2002.11.29), KR 10-0528131 (04 November 2005) presents a rubber screen that replaces wire mesh or grid screens. These rubber screens offer the advantage of effectively eliminating hole blockage due to seismic attachment due to its own elasticity and vibration of the vibration screen body. At the point of support that should be formed about 3 ~ 4 per width, the hole blocking function is weak and coalescing such as soil is generated. .

② Bundling of soil

Soil agglomeration with cement paste and clay soil occurs while the screen is being rolled. Soil agglomeration occurs when the soil is attached to the nucleus with the aggregate. The moisture content is high and the soil pore size increases as the screen hole size decreases.

This problem occurs mainly in pre-screening, and the soil to be recovered and removed is included in the recycled aggregate as it is, which causes deterioration of the recycled aggregate quality and increases the load on the plant.

KR 10-0468630 (2005.01.19), KR 10-0541073 (2005.12.28), and US 4,120,785 (1978.10.17) present a structure installed to have a fixed step by dividing the screen board. In the process of passing the aggregate, the screening and the drop are repeatedly performed to provide the effect of separating the soil and the aggregate. However, this effect occurs only when the aggregate falls, so there is a limit in eliminating the aggregate of the soil.

③ Unbalance of aggregate running speed

Conventional vibrating screens impart an inclination angle of about 10 ° to 20 ° to the deck to achieve the proper throughput, so that the injected aggregate increases in speed with acceleration toward the bottom.

In the screening, the progression speed of the aggregate has an effect of increasing the unit dose (ton / h / m 2), but results in a decrease in the selection rate, and thus cannot achieve the desired selection performance.

Due to this problem, KR 10-0396451 (2003.08.20) proposes a structure to install a number of traveling detention zones that cross a width direction at a certain distance on the upper surface of the screen, and KR 10-0863605 (2008.10.08) Speed of recycled aggregate

It is proposed a screen for screening the aggregate aggregate having a variety of angle change by varying.

The former can be achieved to some extent the effect of retarding the fall rate of the aggregate, but there is a disadvantage that the screening performance decreases due to the earth and sand accumulation and clogging in the progress detention region.

The latter provides a very effective means of uniformly distributing screening loads while maintaining throughput, and is very useful for post screening of aggregates with even particle size. There is a limit to the effectiveness of prescreening at around 30%. In other words, assuming that 30% of the soils to be removed in the pre-screening are sorted with maximum efficiency, 20% is separated and sorted from the steep slope that occupies about 2/3 of the entire screen. When the remaining 10% is sorted on a gentle slope, the gentle slope is screened for 80% of the total aggregate, so the concentration of the screening load cannot be avoided. There is a limit to their utility in high prescreening processes.

KR 10-0838259 (2008.06.09) KR10-0364439 (2002.11.29) KR 10-0863605 (2008.10.08)

Waste Disposal (209.6.20, Dongwha Technology, Cited pages 125 ~ 129p)

The present invention is a vibration screen applied to a plant facility for the selective production of recyclable aggregate from construction waste or construction waste, can effectively suppress the screen blockages and sedimentation of the aggregate, and increase the speed of progress of the aggregate by the acceleration Absorbs and maintains a constant running speed, and the screen board angle is automatically adjusted according to the screening load has the purpose to present a vibrating screen that can improve the screening performance.

In addition, by providing a cushioning means in the input portion of the aggregate of the present invention to prevent screen wear and damage in the input portion, there is an object of presenting a vibration screen that can improve the durability even when applying a rubber screen.

In order to achieve the above object, the present invention provides a vibration screen having an angular displacement screen board corresponding to a load, and sequentially configures a plurality of independent screen boards separately separated along an inclined line of the inner side wall of the vibration body, respectively. The screen board is fixedly supported on the vibrating screen wall by the rotating means and the angle limiting means so that the angular motion is made within the limited angle range in the direction of the aggregate while the screen board is fixedly supported on the vibrating body, and each screenboard is vibrating screen. In the main body of the side wall is characterized in that the continuous installation so as to have a step in the state overlapping a predetermined portion.

In addition, the present invention, in the configuration of the screen board, the frame consisting of a horizontal member, the vertical member and the inner space member in a grid-like frame, a screen net attached to the frame, attached to the vertical member of the frame Consists of the separation prevention plate is formed, characterized in that the contact portion of the screen net and the separation prevention plate with respect to the frame is formed by padding the elastic pad.

In addition, the present invention, the screen net attached to the frame is made of a rubber screen net, the rubber screen net is characterized in that the vertical side is attached to the vertical member of the screen board frame fixed.

In addition, the present invention is characterized in that the support member is fixed to the inner wall of the vibrating body of the input part of the vibration screen, and the shock absorbing device has a structure in which the aggregate guide plate is fixed to receive the spring force against the support member. .

The present invention provides the following effects by having a screen board installed to allow a limited angular movement with respect to the advancing direction of the aggregate having stepped portions and overlapping portions along the side wall inclined lines in the vibrating body of the vibrating screen.

First, each screen board is inclined to one of the heavy according to the weight (load) of the load aggregate about the axis constituting the rotating means in the state that the vibration of the vibration body is applied as it is, the inclination angle is rotated Restricted by the angle limiting means, the load aggregates change from time to time due to various factors, such as the input amount and the vibration amount, so that each screenboard moves continuously around the axis.

The seesaw movement made in the vibration direction from the main body with respect to the advancing direction of the aggregate increases the probability of passage of the aggregate through the screen hole, and provides the effect of improving the screening rate as compared with the case of the simple vibration movement.

Second, due to the principle of inclining to one of the heavy loads according to the weight of the aggregates about the axis, sudden changes in the loads occur frequently when the aggregates are introduced or discharged to the corresponding screen board. As the moment is inclined toward the moment, the impact force applied to the screen board during the collision and seesaw motion with the rotation angle limiting means and one side frame of the screen board acts as an effective inertial force to solve or prevent the screen hole blockage. It facilitates segregation of aggregates, thereby eliminating sediment agglomeration.

Third, the seesaw movement of the screen board reduces the acceleration of the aggregates rolling down the screen boards, and maintains the aggregate progress speed at each screen board to be uniform to some extent so that the progress of the aggregates is accelerated toward the bottom of the screen. The efficiency can be prevented, and the screening performance is maintained uniformly over the entire screenboard range.

By forming an elastic pad at the contact portion of the screen net and the release preventing plate with respect to the frame constituting the screen board, a sudden shock is absorbed to mitigate the wear and damage of the screen net, and the accumulated elastic restoring force prevents the screen net and the breakaway. It can provide a chain wave effect of the plate to reduce the soil adhesion and blockage.

The screen net is composed of a rubber screen net and the rubber screen net is fixed on both sides to generate vibration wave of the rubber main net in addition to the vibration and seesaw motion of the vibration main body. can do.

Aggregate guide plate formed in the input part of the vibrating screen prevents the aggregate input impact from being applied directly to the screen net, thereby improving the durability of the screen net, and preventing damage and wear of the screen net at the input part when constructing the rubber screen net. To provide the effect.

1 is an embodiment of a vibration screen to which the present invention is applied
Figure 2 is an internal configuration of the vibration screen to which the present invention is applied
Figure 3 is a view showing a side cross-sectional state of the plane structure and the coupled state of the frame and the screen network constituting the screen board according to the present invention;
4 is a state diagram of applying a rubber screen net
5a and 5b is an embodiment of a screen board rotating means
6 and 7 is an operation state diagram of the screen board
8 is an embodiment applying the shock absorbing device

1 and 2 illustrate a vibrating screen to which the present invention is applied. The vibrating screen shown provides a vibrating force to a main body frame 10, a vibrating main body 20 installed on the main body frame, and a vibrating main body. A vibrator 30 installed for the purpose, a screen 40 installed along the downward inclination line in the vibrating body, and a lower chute 50 installed under the vibrating body to receive and discharge the sorting material passing through the screen hole; It includes a rear end chute (60) for accommodating and discharging rejected aggregates that do not pass through the screen hole, and a conveyor (70) for transporting the discharged aggregate as an auxiliary facility, and although not shown, a dust collecting facility and a watering device are additionally installed. Has a structure.

The screen 40 is configured by sequentially installing a plurality of separate screen boards 41 each separated along the inclined line of the inner side wall 21 of the vibration main body 20.

Each screen board 41 is fixed to the vibrating body by the rotating means 42 and the rotating angle limiting means 43 so that the angular movement is made within the limited angle range in the advancing direction of the aggregate while being fixed to the vibrating screen wall. Is supported.

In addition, each screen board 41 is continuously installed to have a step in a state overlapping a predetermined portion along the side wall inclined line in the body of the vibration screen.

3 is a view showing the sectional structure of the frame and the screen structure of the screen board 41 according to the present invention, and the side cross-sectional state of the coupled state together, each screen board is attached to the frame 411, the frame It consists of a screen net 412 and the separation prevention plate 413 attached to the vertical member (411b) of the frame, the elastic pad 414 is padded on the contact portion of the screen net and departure prevention plate to the frame Is formed.

Frame 411 is a horizontal member 411a, the vertical member 411b and the inner space member 411c is formed in a lattice frame structure, and rigid to accommodate the screening load and the vibration force applied from the vibration body Made of structure.

The horizontal member 411a and the vertical member 411b constituting the outer frame of the frame 411 support the screen net and transmit the vibration force of the vibrating body to the screen net, and are used for the seesaw motion and the seesaw motion independent of the screen net. The impact force is transmitted to the screen net, and the inner space member 411c has a stable supporting function even when the wire screen or rubber screen is applied to stably support the screen net.

The screen net 412 is composed of a plate-shaped net formed with uniformly formed square or round holes 412a of a size that meets the particle size specifications of the passing aggregate. It can be configured as, and can be configured as a rubber screen net as described later.

4 shows a configuration in which the screen net is composed of a rubber screen net 412 ', and only its vertical side is fixed to the vertical member of the screen board frame with bolts.

The rubber screen net 412 ′ may be a structure having a square or circular screen hole formed on a wear resistant hard rubber plate reinforced with fiber or reinforcing steel, and is formed by weaving a rubber band using a wire or a rope as a core. Can be used.

The rubber screen net 412 'prevents soil from adhering to the surface due to its own elasticity and vibrations from the outside to prevent the blockage, and easily escapes due to the expansion of the hole due to vibration or external impact even when the aggregate is caught in the hole. As a result, the blockage of the hole can be eliminated. As shown in the drawing, only the sides of the rubber screen net 412 'are fixed so that the contact portion between the inner space member and the horizontal member remains free, and the external vibration and aggregate Due to the contact shock, a unique wave of the rubber screen network is generated, which effectively suppresses the blockage of the hole and the piled up soil.

The release preventing plate 413 is attached to the vertical member 411b of the frame to prevent the aggregate injected into the screen from being laterally separated, and protrudes toward the inner wall of the vibration main body.

The elastic pad 414 is fastened and fixed together with the screen net or the release preventing plate while being inserted between the frame and the screen net and between the frame and the release preventing plate, and at the contact portion between the screen net and the frame inner space member 411c. It is formed in a form that is fixed to the inner space member 411c.

The elastic pad 414 may be used by recycling wear-resistant hard rubber or tires or conveyor belts, and absorbs a sudden impact applied to the screen net or the separation prevention plate to alleviate the wear and damage of the screen net, to the elastic restoring force It provides the screen net and the anti-separation plate wave effect by reducing the soil adhesion and clogging. In addition, it provides an effect of reducing the noise of the screen net.

The rotation means 42 and the rotation angle limiting means 43 of the screen board 41 are fixed to and support the screen board to the vibrating screen wall, and transmit the vibration force of the vibration body to the screen board within an angle range limited in the advancing direction of the aggregate. In angular motion, that is, seesaw motion occurs.

Rotating means 42 can be achieved by combining one point (preferably a central point) of both vertical members 411b constituting the screen board and both inner walls of the vibration body with a rotating pair element.

Rotation angle limiting means 43 is a means for limiting the screen board is coupled to the vibrating body by a rotating pair to rotate the screen board in a certain angle range is fixed between the inner wall of both lower vibration body of the screen board It can be achieved by a bar, it can also be achieved by a protrusion bar which is fixed to both sides of the inner wall of the lower vibration body of the screen board, the connection bar or the protrusion bar is a rotation center upper screen board frame or a rotation center lower screen board frame It has a stopper action for limiting the rotation of the screen board by further contact with and further reducing the screen hole blockage and sedimentation by applying an impact force to the screen net during the seesaw movement of the screen board.

The connecting bar also has the effect of reinforcing the vibration main body like the reinforcing bar 22 by fixing both walls of the vibration main body in a rigid structure.

5A and 5B show an embodiment of the rotating means 42 and the rotating angle limiting means 43.

FIG. 5A illustrates that the shaft casing 422 penetrates the vibrating body 20 so that the rotating shaft 421 protrudes into the vibrating body 20 as the rotating means 42, and the longitudinal member of the rotating shaft end and the screen board frame 411. It is the structure which fixedly bonded 411b.

5B shows the rotating shaft 42 as a rotating means 42 in which the rotating shaft 421 'plunge 421a is fixedly coupled to the vibrating body and coupled to the longitudinal member 411c of the screen board frame 411. It is a structure in which 421 'is axially coupled.

The rotation angle limiting means 43 is composed of a connecting bar 431 connected across the inner wall of the vibration body and an elastic pad 432 attached to the upper screen board contact portion of the connecting bar, and the rotation angle limiting means ( 43) are respectively installed on the upper and lower portions of the screen board so as to be an equilateral triangle with respect to the center of rotation, the upper rotation angle limiting means restricts the screenboard inclination angle is reduced below a certain angle, the lower rotation angle limiting means Limit the inclination angle to increase by more than a certain angle.

The elastic pad temporarily alleviates the impact caused by the seesaw movement to protect the contact portion, and on the other hand to reduce the impact force absorbed by the reaction force to provide a secondary vibration, and to prevent noise.

When the effects of hole blockage and soil pile-up are reduced, such as post-screening, springs are formed at the elastic pad positions to reduce the effect of hole blockage due to impact inertia, and to increase the secondary vibration effect by restoring force to increase the sorting performance of aggregates. Could be done in a way.

In general, it is preferable that the inclination of the screen is smaller as the screen length is shorter in the range of 10 ° to 20 °, and the larger the screen length is, the larger the inclination is applied. Therefore, the position of the rotation angle limiting means 43 in the lower portion is determined to be within the maximum inclination angle, and the position of the rotation angle limiting means 43 in the upper portion is formed at a position where the inclination of the screen is maintained at least 0 °.

Each of the screen boards 41 to which the rotating means and the rotating angle limiting means are applied are continuously installed to have a step in a partially overlapped state along the side wall inclined line in the vibrating body.

Steps with adjacent screenboards cause the aggregate to fall freely in several stages, leading to the separation and dispersion of aggregate and soil by drop impact.

The overlapping length of the screen board and the screen board is appropriately applied considering the angular displacement of the screen board so that the aggregate falling from the end of the screen board can be safely received from the screen board afterwards.

Figure 6 shows the angular displacement state of the screen board by the above-described structure, Figure 7 shows the operating state of the screen board in accordance with the load caused by the aggregate input.

As shown, the center of rotation is centered on the length of the screen board, and the force acting on the bottom of the center of rotation is F1, the load acting on the upper side is called F2, and the maximum displacement angle is A, L is

① If F1 = F2, the screen board is screened by the vibration applied from the vibration main body while balancing in the angular displacement state of A / 2.

② If F1 <F2, the screen board rotates clockwise by A, and the screening is progressed by the vibration applied from the vibration main body in the state of being joined to the upper connection bar.

③ If F1> F2, the screen board rotates counterclockwise as much as A, and the screening is progressed by the vibration applied from the vibration main body in the bonded state to the lower connection bar.

As described above, each screen board is inclined to one of the heavy ones according to the load of the load aggregate about the axis constituting the rotating means while the vibration of the screen body is applied as it is, and the inclination angle is limited to the rotation angle. Restricted by the means, the loading aggregates change from time to time due to various factors such as the input amount and the vibration amount, so that each screenboard is continuously operated in a random manner about the axis.

The seesaw movement is inclined momentarily toward the greater load due to the momentary difference between F1 and F2, and the stopping impact force by the rotation angle limiting means acts as an effective inertial force to eliminate or prevent screen hole blockage. The impact force transmitted to the soil facilitates segregation of soil and aggregates, thereby relieving soil agglomeration.

In addition, the seesaw movement of the screen board reduces the acceleration of the aggregate rolling down the screen board, and maintains the aggregate progress speed at each screen board to be uniform to some extent, which is caused by the speed of the aggregate progressing toward the lower part of the screen. The efficiency can be prevented, and the screening performance is maintained uniformly over the entire screenboard range.

As the seesaw movement of the screen board is continuously performed, the oscillation imparted from the main body and the seesaw movement with respect to the advancing direction of the aggregate increase the probability of passing the aggregate through the screen hole, and the screening rate is higher than that of the simple vibration movement. Provides the effect of improving it.

8 shows a configuration in which the shock absorbing device 80 is combined with the above-described configuration of the present invention.

The shock absorbing device 80 is fixed to the support member 81 on the inner wall of the vibration main body 23 of the vibration input unit 23, the aggregate guide plate to receive a spring force of the 82 relative to the support member 81 ( 83) is fixedly installed.

The shock absorbing device 80 is absorbed by the aggregate guide plate 83 receives the impact force of the spring 82 is turned over to the screen net to prevent the impact directly applied to the screen net to prevent screen net durability Improves and prevents screen net damage and abrasion at the input during construction of the rubber screen net.

10: main frame
20: vibration body
21: inner wall 22: reinforcing bar 23: input portion
30: vibrators
40: Skine
41: screen board 411: frame 411a: horizontal member
411b: vertical member 411c: inner space member
412: screen net 412a: hole 412 ': rubber screen net
413: release prevention plate 414: pad
42: rotating means 421, 421 ': rotating shaft 421'a: plunge
422: shaft casing 423: bearing
43: rotation angle limiting means
431: connecting bar 432: elastic pad
50: lower chute
60: rear suit
70: Conveyor
80: shock absorber
81: support member 82: spring 83: aggregate guide plate

Claims (4)

In the vibrating screen for recycling the construction waste, a plurality of separate screen boards are separately installed along the inclined line of the side wall of the vibrating body in order to form a screen, each screen board is fixed to the vibrating screen wall It is fixedly supported on the vibrating screen wall by the rotating means and the angle limiting means so that the angular motion is made within the limited angle range in the direction of the aggregate, and each screenboard overlaps a portion along the side wall inclination line in the main body of the vibrating screen. Vibrating screen having a load-response angular displacement screen board, characterized in that the continuous installation so as to have a step in the state.
The method according to claim 1,
The screen board is composed of a frame comprising a horizontal member, a vertical member, and an inner space member in a lattice frame, a screen net attached to the frame, and a separation prevention plate attached to the vertical member of the frame. Vibrating screen having a load-response angular displacement screen board, characterized in that the contact portion of the screen net and the separation prevention plate for the pad.
The method according to claim 2,
The screen net is made of a rubber screen net, and the vibration screen having a load response angular displacement screen board, characterized in that only the vertical side is fixed to the vertical member of the screen board frame.
The method according to claim 1,
Load-absorbing angular displacement screen board, characterized in that the support member is fixed to the inner wall of the oscillating main body of the vibrating screen, and the shock absorbing device has a structure in which an aggregate guide plate is fixed to receive the spring force against the support member. Vibrating screen.

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