JP2010240602A - Vibrating screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibrating screen discharging a large lump removed from a supplied raw material to a main screen without loading a driving device. <P>SOLUTION: The vibrating screen includes: a body frame 7; the main screen 15 supported through an elastic member 19 on the body frame 7 in such a state that a sieve surface is inclined; a vibration exciter 20 provided on the main screen 15; and a pre-screen 22 supported through an elastic member 23 on the body frame 7 in such a state that the sieve surface is inclined so as to be positioned on the main screen 15. An external force receiving member 26 for transmitting external force from a bucket B of a charging heavy machine S to the vibrations of the pre-screen 22 is provided on the screen frame 24 of the pre-screen 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vibrating screen for sieving industrial waste, earth and sand, crushed stone, and the like.

  In recent years, demands for recycling machines that produce recycled products from various recycled raw materials such as soil-improving machines, crushers, shredders, etc., such as construction generated soil, rocks, and waste tires, are increasing in various places. One of the machines that assist the work of these recycling machines is a vibrating screen that uses recycled materials supplied to the recycling machines and recycled products discharged from the recycling machines as input materials, and sorts these input materials according to the particle size. . In this vibrating screen, the input raw material is sieved by oscillating a frame with a sieve member (screen) mounted on the inside (see Patent Document 1, etc.).

JP 2002-4333 A

  If a material that is significantly larger than the selected particle size is mixed in the raw material put into the vibrating screen, an excessive load may be applied to various parts of the airframe including the sieve member, resulting in damage. Therefore, when sorting the raw material containing large lumps, remove the large lumps from the raw materials in advance (pretreatment) so that large lumps exceeding the sorting particle size are not thrown into the vibrating screen. It is conceivable to take measures such as separately providing a screen for removing large lumps.

  Here, when discharging a large lump accumulated on the screen for removing the large lump to the outside of the machine body, the large lump on the sieving member is appropriately discharged by vibrating the large lump removing screen with a vibrator. If a certain amount of large mass is deposited, a measure such as raising the sieving surface with a cylinder or the like and dropping the deposit on the sieving member can be considered.

  However, if a vibrator or tilt mechanism is installed on the screen for removing large lumps separately from the main vibrating screen that sifts the input raw material with the desired sorting particle size, the number of parts including the drive unit will increase, and consequently the structure. It becomes a factor of the complexity of the aircraft and the enlargement of the aircraft. In addition, there is a configuration in which a common frame is provided with two upper and lower sieve members, and a large lump that is significantly larger than the selection particle size of the lower sieve member is removed by the upper sieve member, but the load on the spring is large. Therefore, in order to obtain an amplitude equivalent to that of a single-stage screen, the vibrator must be enlarged.

  Therefore, an object of the present invention is to provide a vibrating screen that can discharge a large mass removed from raw materials charged into a main screen without mounting a driving device.

  In order to achieve the above object, a first invention includes a main body frame, a first screen supported on the main body frame via a first elastic member in a state where a sieving surface is inclined, and the first screen. And a second screen supported on the main body frame via a second elastic member with a sieving surface inclined so as to be positioned on the first screen. And an external force receiving member that transmits an external force from the working device of the input heavy machine to the second screen is provided on the frame body of the second screen.

  According to a second invention, in the first invention, the external force receiving member is supported by a frame body of the second screen via an elastic member.

  A third invention is characterized in that, in the first or second invention, the external force receiving member is provided so as to protrude upward on the upstream side in the raw material moving direction of the second screen.

  According to a fourth invention, in the first or second invention, the external force receiving member is provided so as to protrude upward in an intermediate portion of the second screen in the raw material movement direction.

  In a fifth aspect based on any one of the first to fourth aspects, the first elastic member and the second elastic member are both springs, and the spring constant of the second elastic member is the first elastic member. It is characterized by being higher than the spring constant of the member.

  According to the present invention, since the passive vibration type sub-screen is installed on the vibration type main screen, the large mass removed from the raw material charged into the main screen can be discharged without mounting a driving device.

It is a side view showing the schematic structure of the self-propelled screen carrying the vibration screen concerning a 1st embodiment of the present invention. It is a top view showing a schematic structure of a self-propelled screen carrying a vibrating screen concerning a 1st embodiment of the present invention. It is a front view showing schematic structure of the self-propelled screen carrying the vibration screen concerning a 1st embodiment of the present invention. It is a rear view showing schematic structure of the self-propelled screen carrying the vibration screen concerning a 1st embodiment of the present invention. It is a figure showing the mode of the selection operation | work using the vibration screen which concerns on 1st Embodiment of this invention. It is a figure showing the mode of the vibration of the pre screen with which the vibration screen which concerns on 1st Embodiment of this invention was equipped. It is a side view showing schematic structure of the vibration screen which concerns on 2nd Embodiment of this invention. It is a rear view showing schematic structure of the vibration screen which concerns on 2nd Embodiment of this invention. It is a side view showing schematic structure of the vibration screen which concerns on 3rd Embodiment of this invention. It is a rear view showing schematic structure of the vibration screen which concerns on 3rd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is a side view showing a schematic configuration of a self-propelled screen equipped with a vibrating screen according to a first embodiment of the present invention, FIG. 2 is a plan view, FIG. 3 is a front view seen from the front, and FIG. FIG. In the following description, the left and right in FIG. 1 are the front and back of the self-propelled screen, respectively.

  The illustrated self-propelled screen includes a traveling body 1 for traveling on its own, a main body frame 7 provided on the traveling body 1, and a self-vibrating main screen (vibrating sieve) provided on the main body frame 7. ) 15, a passive vibration type pre-screen (vibrating sieve) 22 provided on the main body frame 7, a discharge conveyor 30 that conveys and discharges a small-size sorted product that has passed through the main screen 15, and the main body frame 7. And a mounted power unit (power device) 29.

  The traveling body 1 includes a pair of left and right track frames 2, a driven wheel 3 provided at the rear end of the track frame 2, a drive wheel 4 provided at the front end of the track frame 2, and a drive device directly connected to the drive wheel 4. (Travel hydraulic motor) 5 and an endless track type crawler belt 6 wound around the driven wheel 3 and the drive wheel 4.

  The main body frame 7 is disposed on the upper part of the track frame 2 so as to protrude from the front and rear of the traveling body 1. The main body frame 7 includes a support base 9 whose upper surface is inclined downward toward the rear, and the main screen 15 and the pre-screen 22 are supported by the support base 9.

  The main screen 15 sorts the input raw material that has passed through the pre-screen 22 according to the particle size, and is a frame type that is supported on the support frame 9 through an elastic member (a spring in this example) 19 so as to vibrate. A screen frame (frame body) 16, a sieve member 17 of a predetermined size attached to the inside of the screen frame 16, and a vibration device 20 for vibrating the screen frame 16. The central portion is located substantially above the rear end of the traveling body 1. Although a coil spring is used as the elastic member 19 in FIG. 1, other types of elastic bodies such as rubber springs may be used. As the elastic member 19, a member having a relatively small natural frequency and a soft softness (relatively small spring constant) is selected in consideration of the ground frequency and resonance at the time of start / stop. The elastic members 19 are arranged on the left and right sides of the screen frame 16 in the front-rear direction, and the screen frame 16 is supported by a total of four elastic members 19. The sieving member 17 constitutes a sieving surface, and other than a mesh-like sorting member and a grind-like sorting member, a sorting member used for a finger screen or a star screen can be used, and the sieving surface is inclined downward toward the rear. It is arranged to become. The vibration exciter 20 vibrates by rotating an eccentric shaft and eccentric weight with a motor. When the vibrating device 20 is driven, the screen frame 16 and the sieve member 17 are shaken integrally, and among the input materials that have passed through the pre-screen 22, a material that is smaller than the size of the sieve member 17 passes, A larger particle size remains on the sieve member 17 and is discharged backward.

  The pre-screen 22 sorts the raw material input by an input heavy machine such as a hydraulic excavator according to the particle size, and removes and discharges a massive mass significantly larger than the selected particle size of the main screen 15 from the input raw material. The pre-screen 22 is a frame-type screen frame (frame body) 24 supported on the support frame 9 through an elastic member (spring in this example) 23 so as to be able to vibrate separately from the screen frame 16 of the main screen 15. And a sieve member 25 of a predetermined size attached to the inside of the screen frame 24 and an external force receiving member 26 provided on the screen frame 24, and arranged so as to cover the upper part of the main screen 15. ing. Although a coil spring is used as the elastic member 23 in FIG. 1, other types of elastic bodies such as rubber springs may be used. As the elastic member 23, one having a natural frequency higher than that of the elastic member 19 of the main screen 15 and relatively hard (relatively large spring constant) is selected. The elastic members 23 are respectively disposed on the left and right sides of the screen frame 24 in front of and behind the elastic members 19 of the main screen 15, and the screen frame 24 is supported by a total of four elastic members 23. The sieving member 25 has a larger sieving surface than the sieving member 17 of the main screen 15, and in addition to a mesh-like sorting member and a grind-like sorting member, a sorting member used for a finger screen, a star screen, or the like may be used. The sieving surface is arranged to be inclined downward toward the rear. The pre-screen 22 does not have any driving device including a vibration exciter.

  In the present embodiment, the external force receiving member 26 is formed of a steel bar having a sufficient thickness, and both left and right sides of the upstream side wall surface (front wall) of the screen frame 24 of the prescreen 22 in the raw material moving direction. Are fixed firmly by appropriate means such as welding in a posture in which the shaft centers are directed vertically. Further, the upper portion of the external force receiving member 26 protrudes sufficiently above the screen frame 24 so that it can be easily touched by a working device (bucket or the like) of the input heavy machine, and the lower end portion is substantially at the lower end of the front wall of the screen frame 24. It is matched. In the case of this embodiment, the dimension taken in the vertical direction of the screen frame 24 is larger on the upstream side than on the downstream side, the front wall is formed so as to be wider, and a long contact distance with the external force receiving member 26 is ensured. Thus, the rigidity capable of withstanding the external force applied to the external force receiving member 26 is secured. On the other hand, the screen frame 24 is made narrower as it goes rearward so as to reduce the weight of the pre-screen 22.

  The power unit 29 is mounted on the upper part of the front side portion of the main body frame 7. The center of gravity of the power unit 29 is in front of the traveling body 1, and the center of gravity of the entire aircraft is placed on the traveling body 1 by balancing the weight with other mounted devices. Although not specifically shown, there are an engine which is a drive source of the self-propelled screen, a hydraulic pump driven by the engine, a plurality of control valves which control pressure oil supplied from the hydraulic pump to each driving device, and the like. Built in the power unit 29.

  The discharge conveyor 30 conveys an input raw material having a particle size smaller than the size of the sieve member 17 that has passed through the main screen 15 and discharges it to the front of the machine body. The discharge conveyor 30 rotates at both the front and rear ends of the conveyor frame 35. A driving wheel 36 and a driven wheel 37 that are freely provided, a conveyor belt 38 that is wound around the driving wheel 36 and the driven wheel 37, and a driving device (a hydraulic motor for a discharge conveyor) that is connected to the driving wheel 36 are provided. Yes. By rotating the driving wheel 36 by the driving device, the conveyor belt 38 is circulated and driven between the driving wheel 36 and the driven wheel 37. The conveyor frame 35 is provided in an upwardly inclined posture toward the front, and extends from the lower position of the main screen 15 over the power unit 29 to the outside of the machine (in front of the machine body). Further, the front portion of the conveyor frame 35 is supported from the power unit 29 or the main body frame 7 via the support member 31, and the rear portion is supported by the main body frame 7 via the support member 32. Although not particularly shown, the discharge conveyor 30 is provided with a known belt tension adjusting mechanism on the driven wheel side.

  Next, operations and effects of the self-propelled screen having the above-described configuration will be sequentially described.

  For example, as shown in FIG. 5, when the raw material is input to the prescreen 22 by the input heavy machine S such as a hydraulic excavator, the input raw material having a predetermined particle size or less passing through the sieve member 25 of the prescreen 22 is guided to the main screen 15. Larger lumps larger than that remain on the sieve member 25 or move on the sieve member 25 along the inclination and are discharged and accumulated at the rear of the machine body (accumulated product Y). The input raw material that has passed through the pre-screen 22 falls on the sieve member 17 of the main screen 15 and is screened, and the input raw material that has passed through the vibrating sieve member 17 and has a particle size equal to or less than the selected particle size is guided onto the discharge conveyor 30 and discharged. 30 is transported forward, discharged to the front of the machine body and accumulated (accumulated product X). On the other hand, the input raw material larger than the selected particle size and remaining on the sieve member 17 is moved on the inclined surface of the sieve member 17 along with the vibration of the shaker 20, discharged to the rear of the machine body, and removed by the prescreen 22. Accumulated with the mass (accumulated product Y).

  At this time, unlike the main screen 15, the pre-screen 22 is not actively vibrated by a shaker or the like, so that the input raw material is likely to be deposited on the sieving surface as compared with the main screen 15. If a pre-screen 22 is provided with a vibration exciter to actively vibrate or a pre-screen 22 is configured to stand up with the rear end as a fulcrum, the discharge of large blocks on the pre-screen 22 is improved. Since a separate drive device is required, the number of parts increases, resulting in a complicated structure and an increase in the size of the aircraft. The main screen 15 is provided with two upper and lower sieving surfaces, the lower sieving surface corresponds to the sieving member 17 of the main screen 15 of the present embodiment, and the upper sieving surface corresponds to the sieving member 25 of the pre-screen 22. By doing so, both sieving surfaces can be vibrated with the same vibrator, but in this case, the weight of the main screen 15 is increased by the amount of addition of the upper sieving surface. The main screen 15 needs to vibrate with a desired amplitude in order to efficiently select the input raw material having the final target particle size. However, when the main screen 15 has two upper and lower stages, it is equivalent to the configuration of the present embodiment. In order to obtain the amplitude, the vibrator must be enlarged.

  Therefore, in the present embodiment, the external force receiving member 26 is provided on the pre-screen 22, and the external force from the working device such as the input heavy machine S is received by the external force receiving member 26 and converted into vibration of the pre-screen 22 (vibration is applied to the pre-screen 22). Communicate). That is, as shown in FIG. 6, for example, an external force is input to the pre-screen 22 by pressing or tapping the external force receiving member 26 with the bucket B of the input heavy machine S, and the elastic member is elastically deformed by receiving the external force. The restoring force of 23 causes vibrations in the prescreen 22. As a result, the large mass deposited on the sieve member 25 is shaken, moved along the inclined surface, and discharged to the rear of the machine body. Accordingly, when a large lump has accumulated on the sieve member 25 as the work progresses, the operator of the input heavy machine S inputs an external force with the bucket B to the external force receiving member 26 as appropriate, and prompts the discharge of the large lump to pre-screen 22. The raw material is introduced into the pre-screen 22 while suppressing clogging.

  According to the present embodiment, by adding a simple configuration in which the external force receiving member 26 is simply provided to the pre-screen 22 that is elastically supported in this way, a driving device such as a motor or a cylinder is not separately mounted. The large mass removed from the raw material charged into the main screen 15 can be appropriately discharged. Therefore, the complexity of the structure and the increase in size of the airframe can be suppressed, and the desired amplitude of the main screen 15 can be secured by the relatively small vibrator 20.

  Further, when the prescreen 22 is configured to be detachable from the support base 9, the prescreen 22 can be operated as a normal one-stage vibrating screen. In other words, if the pre-screen 22 is additionally installed above the normal one-stage vibrating screen, the vibrating screen of this embodiment can be configured. The pre-screen 22 has a very simple configuration, so additional installation is easy, and a raw material containing large lumps that could not be directly input to the first vibration screen until now has been input without pre-treatment and sorting is performed. It becomes possible. It is also possible to prevent the machine from being damaged by supplying raw materials to the vibrating screen without noticing that a large mass is mixed.

  In addition, since it is assumed that the input heavy machine S performs the raw material input operation from the side or the lower side of the screen, that is, from the left or right or rear of the vibrating screen, the external force receiving member 26 is used as the prescreen 22 as in the present embodiment. Is provided at the end (the highest position of the fuselage) where there is little risk that the bucket B or the like that has swung will interfere with other components of the vibration screen, and the operator of the input heavy machine S or the like It is possible to reduce the cautiousness of operations required for the operation.

  Furthermore, when the spring constant of the elastic member 23 that supports the pre-screen 22 is made larger than the spring constant of the elastic member 19, the natural frequency of the elastic member 23 becomes higher than that of the elastic member 19, so that the external force receiving member When an external force is applied to 26, the pre-screen 22 can be vibrated at a higher frequency, and the effect of removing sediment and the like is further improved. Further, since the elastic member 23 of the pre-screen 22 has a high spring constant and is harder than the elastic member 19 of the main screen 15, there is also an advantage that excessive behavior of the elastic member 23 due to an impact at the time of loading a large mass can be suppressed.

  FIG. 7 is a side view showing a schematic configuration of a vibrating screen according to the second embodiment of the present invention, and FIG. 8 is a rear view seen from the rear. In these drawings, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the above drawings, and the description thereof is omitted.

  The present embodiment is different from the first embodiment in the arrangement of the external force receiving member 26. The external force receiving member 26 in the present embodiment is provided at an intermediate portion of the prescreen 22 in the raw material flow direction (front-rear direction) so as to protrude above the screen frame 24 of the prescreen 22.

  As in the first embodiment, the external force receiving member 26 is formed of, for example, a sufficiently thick round bar-shaped steel material, and one axis is placed on each of the left and right outer wall surfaces of the screen frame 24, and the axis is directed vertically. The posture is firmly fixed by appropriate means such as welding. The upper portion of the external force receiving member 26 protrudes sufficiently above the screen frame 24 so that it can be easily touched by a working device (bucket or the like) of the input heavy machine, and the lower end portion is formed at the lower ends of the left and right wall surfaces of the screen frame 24. It is almost matched. Other configurations are the same as those of the first embodiment.

  Also in the present embodiment, the large mass removed from the raw material charged into the main screen 15 is discharged without a separate drive device by a simple configuration in which the external force receiving member 26 is simply provided on the pre-screen 22 elastically supported. can do. Therefore, the complexity of the structure and the increase in size of the airframe can be suppressed, and the desired amplitude of the main screen 15 can be secured by the relatively small vibrator 20. In addition, because of the simple configuration, the pre-screen 22 can be easily installed on a general vibrating screen. If the pre-screen 22 is added to a normal vibrating screen to configure the vibrating screen of this embodiment. Thus, it becomes possible to carry out a sorting operation by introducing a raw material containing a large mass, which has not been able to be directly input to a one-stage vibrating screen until now, without pretreatment. It is also possible to prevent the machine from being damaged by supplying raw materials to the vibrating screen without noticing that a large mass is mixed.

  Further, since the external force receiving member 26 is in the middle of the inclination of the prescreen 22, for example, when the input heavy machine is arranged on the discharge side (rear side) of the prescreen 22, the external force is applied from the main body of the input heavy machine compared to the first embodiment. Since the distance to the receiving member 26 is short, it is easy to apply an external force to the external force receiving member 26 when using a relatively small input heavy machine.

  FIG. 9 is a side view showing a schematic configuration of a vibrating screen according to the third embodiment of the present invention, and FIG. 10 is a rear view as seen from the rear. In these drawings, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the above drawings, and the description thereof is omitted.

  The present embodiment is different from the first embodiment in that an external force input member 26A is supported on the screen frame 24 of the pre-screen 22 via an elastic member 27. Two external force receiving members 26A in the present embodiment are provided on the front surface of the screen frame 24 as in the first embodiment, but may be provided on the left and right sides of the screen frame 24 as in the second embodiment.

  Explaining the configuration in more detail, the external force receiving member 26A is formed of, for example, a steel bar having a sufficient thickness as in the first embodiment, and the elastic member 27 is attached to the support member 28 attached to the screen frame 24. And extends sufficiently upward to be easily touched by a working device (bucket or the like) of the input heavy machine. On the other hand, the support member 28 is firmly fixed to the screen frame 24 by appropriate means such as welding, and the vertical dimension is approximately the same as that of the front wall of the screen frame 24. As the elastic member 27, other types of elastic bodies such as rubber springs can be used in addition to the coil springs as shown in FIGS. Other configurations are the same as those of the first embodiment.

  In the present embodiment, the same effect as in the first embodiment can be obtained. In addition, since the external force receiving member 26A is supported by the elastic member 27, an excessive external force is temporarily input from the input heavy machine. In this case, the force can be reduced so that an unnecessary force is not applied to the screen frame 24. Further, when the external force is received, the external force receiving member 26A itself vibrates with respect to the screen frame 24. Therefore, the vibration time of the screen frame 24 can be extended as compared with the embodiment described above.

  In the first to third embodiments described above, the case where two external force receiving members 26 and 26A are provided has been described as an example. However, the number is not limited, and one or three or more may be used. . Further, the shape is not limited to the round bar shape, but may be other shapes, for example, the cross section may be a rectangular shape or a plate shape. Furthermore, the case where the external force receiving members 26 and 26A protrude above the screen frame 24 has been described as an example. However, the present invention is not limited to this, and the external force receiving members may protrude left and right or front and rear of the screen frame 24. It is conceivable that a part of the screen frame 24 is thickened or hardened, and the strengthened portion is used as an external force receiving member. The external force receiving member may be solid or hollow.

  Moreover, although the case where the pre-screen 22 has one sieving surface has been described as an example, a configuration having a plurality of sieving surfaces so that the eyes become finer sequentially from the upper stage may be adopted. It is also conceivable that the pre-screen 22 can be easily detached from the support base 19 as necessary.

  In addition, the main screen 15 has been described by taking as an example a configuration in which the raw material is divided into two groups, which are larger or smaller than the predetermined particle size, by the one-stage sieve member 17, but the main screen 15 has two or more stages of sieve members. The present invention can also be applied to a vibrating screen that is provided and sifts input raw materials into three or more groups having different particle sizes. In this case, a side conveyor for carrying out the raw material having an intermediate particle size can be added. Further, if necessary, the discharge conveyor 30 may be bent so as to be bent in accordance with transportation restrictions on general roads during transportation, or may be configured to change the bending angle in order to adjust the discharge height. Furthermore, the present invention can also be applied to a traction traveling type mobile vibration screen or a stationary vibration screen, and similar effects can be obtained.

7 Main body frame 15 Main screen 16 Screen frame 17 Sieve member 19 Elastic member 20 Vibrator 22 Pre-screen 23 Elastic member 24 Screen frame 25 Sieve member 26, 26A External force receiving member 27 Elastic member B Bucket S Loading heavy machine

Claims (5)

Body frame,
A first screen supported via a first elastic member on the main body frame with the sieving surface inclined;
A vibrator provided on the first screen;
A second screen supported on the main body frame via a second elastic member with a sieving surface inclined so as to be located on the first screen,
An oscillating screen, wherein an external force receiving member for transmitting an external force from a working device of an input heavy machine to the second screen is provided on a frame body of the second screen.   The vibrating screen according to claim 1, wherein the external force receiving member is supported by a frame body of the second screen via an elastic member.   3. The vibrating screen according to claim 1, wherein the external force receiving member is provided so as to protrude upward on the upstream side in the raw material moving direction of the second screen.   3. The vibrating screen according to claim 1, wherein the external force receiving member is provided so as to protrude upward in an intermediate portion of the second screen in the raw material moving direction.   The first and second elastic members are both springs, and the spring constant of the second elastic member is higher than the spring constant of the first elastic member. 2. The vibrating screen according to item 1.

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