JPH09206685A - Powder catching machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the capacities of a pellet container and a powder receiving container by supporting a screen through which a powder can pass but pellets can't horizontally and reciprocatably and reciprocating it to make the velocity asymmetric between forward and backward ways in an apparatus for separating crushed plastics into pellets and a powder. SOLUTION: A hopper 2 is installed in an opening part in the upper part of a casing 1, a screen 5 composed of a net 3 and a frame 4 is installed horizontally movably right under the hopper 2. The net is made by combining an upper net 6 and a lower net 7 together, and the mesh of the upper net 6 is fine, but that of the lower net 7 is rough. A powder receiving container 8 is arranged extractably/insertably right under the net 3, and a pellet container 9 is placed in front of the screen 5. An appropriate number of tapping balls 13 are placed in the space between the upper net 6 and the lower net 7 to prevent the clogging of the powder. The rotation of a motor 40 is transferred to an eccentric cam 43 through a speed reducer 41, and the screen 5 is moved X,-X direction by the rotation of the cam 43.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust remover for removing dust from crushed plastic pellets. In plastic injection molding, the plastic that hardens in the path that guides the plastic into the mold becomes the runner. It exhibits various tree structures depending on the mold structure. This is unnecessary and should be collected and reused. In addition, defective products may be produced even with plastic molded products. Defective products are also unnecessary and should be reused. In this case, cut the runners and defective products to an appropriate size and put them in the crusher,
Grind into fine pellets. The crushed pieces (pellets) are mixed with the virgin raw material, heated again, and melted to be used as a molding material.

In a crusher, a large amount of powder is generated because a runner and a product are crushed by a cutting blade that rotates at a high speed. The powder does not melt even when heated, which hinders the mixing and melting of the pellets. It is necessary to remove the powder from the crushed material in advance and use it as a recycled material. The present invention relates to an apparatus for effectively removing powder from crushed material.

[0003]

2. Description of the Related Art One material is taken out from a mixture of two kinds having different sizes and densities, and this is a kind of sieve. When the mesh is vibrated and a pulverized product is supplied onto the mesh, powder smaller than the mesh passes through the mesh and falls, and pellets roll on the mesh to reach the outlet. In this way, powder and pellets are discriminated. Several proposals have been made regarding vibrating screens for discriminating between powder and particles. There are flat and cylindrical nets. The mesh itself may be a nylon mesh or punched metal. There are numerous prior art techniques. Here, a typical cylindrical sieve device and a plane inclined sieve device will be described.

[Conventional Example: Cylindrical Sieve Device] A stainless steel cylindrical net is rotated around an inclined shaft, and a pulverized product is put in through an upper opening. The powder falls through the mesh and falls. The pellets roll down the mesh and come out to the exit. You can easily distinguish between powder and pellets. As the net rotates, the pellets roll by gravity and move downward. The pellets are taken into the box placed at the lower exit. Even if it is rotating, the net will be blocked by the powder. Therefore, the hammer is used to hit the net intermittently to drop the powder from the net. Since the net is inclined and rotating, the pellet gradually falls downward due to its own weight.

[Prior art example: large-scale plane inclined sieve device] Punching metal, stainless steel mesh, nylon mesh, etc. are fixed to a flat frame, the frame is supported obliquely, and the mesh is reciprocated.
Since it is diagonal, the powder and pellets roll on the net and fall down. The powder passes through the net and falls directly below, and the pellets enter the outlet box. There are already many such flat plate type sieves.

[Conventional Example: Small-sized inclined reciprocating sieve device] Although the above-mentioned vibrating sieve has already been used in many cases, it is a large-scale device and may be directly attached below the discharge port of the crusher. Can not. The outlet of the grinder is at the lowest point of the casing. The distance to the ground is at most tens of centimeters.
A large vibrating screen device cannot be placed right below the discharge port of the crusher. Then, it is necessary to place a shallow container at the discharge port of the crusher to store the crushed material, and sometimes throw it on the mesh of the vibrating screen.

There is an urgent need for a more compact powder remover that can easily separate powder and pellets from a crushed product and that can be placed under the discharge port of a crusher. If the height of the device is low and a device capable of separating powder and pellets at a high classification rate is available, it can be placed at the discharge port of the crusher.

In order to meet such an object, the present applicant has proposed that a small dust remover (Japanese Patent Application No. 6-14832, Japanese Patent Application Laid-Open No. 7-14832)
-204583) is invented. This is composed of a hopper that can be placed directly below the discharge port of the crusher, a double net provided following the hopper, a mechanism for reciprocating the double net, and a powder receiving container. The crushed material discharged from the discharge port of the crusher enters the hopper and rolls down the double mesh at an angle. The powder falls over the net and the pellets reach the outlet. Store in the pellet container at the outlet. Since the net reciprocates, the pulverized material can gradually move in one direction.

The reason why the double net is used is to prevent clogging by fixing the lower net and moving the upper net. It is left under the crusher and when the pellet container is full, it is put into the raw material hopper of the molding machine or transferred to the storage container of used pellets. It is very convenient because it is short and can be placed under the crusher. Conventionally, the crushed material container is placed under the discharge port of the crusher, and when it is full, it is carried by hand and put into the hopper of the vibrating screen, so that manpower can be saved. Great labor saving effect.

[0010]

However, the Applicant's aforementioned dust remover still has drawbacks. Since the net is inclined, the pellet container at the exit of the net must be shallow. D = more than the height of the net just below the hopper
The height of the exit net is reduced by Lsin Θ. Following that, a pellet container is provided. The pellet container must be shallow. If it is a shallow container, pellets will be accumulated and it will be full. Must be replaced frequently.

In the case of pellets, it is possible to automatically convey the pellets from the outlet of the dust remover and load them into the molding machine. However, there are problems with powder. Since the net is inclined, the powder receiving container is also small. If the powder receiving container is to be installed in the same direction as the pellet outlet, the height of the powder receiving container must be lower than the position of the net at the outlet. That is, the capacity of the powder receiving container is limited to a small value.
Then, the powder receiving container must be monitored frequently, and when it is full, it must be taken out and transferred to another container.

It is still inconvenient because it requires frequent manual work. If the capacity of the powder receiving container can be increased, the frequency of replacement work can be reduced. It is an object of the present invention to propose a powder remover capable of increasing the capacity of a pellet container and a powder receiving container while satisfying the condition of being placed under the discharge port of a crusher. It is a second object of the present invention to provide an apparatus capable of reducing the number of manual operations by increasing the capacity of the container. It is a third object of the present invention to provide a dust remover capable of easily changing the classification speed depending on the amount of pulverized material.

[0013]

In the dust remover of the present invention, the crushed product is fed in one direction by horizontally asymmetrically reciprocating the net. The end of the feed direction is the pellet outlet. The pellet container can be placed at the pellet outlet, but since the net is horizontal, the net height at the exit position is high. A tall pellet container can be placed. You can also place a tall powder container. Since the volume of the container can be increased, the frequency of collecting pellets and powder can be reduced. It is possible to reduce the number of operations that require manual labor.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention holds a sieve horizontally rather than obliquely and causes it to reciprocate asymmetrically. The asymmetric reciprocating motion enables the crushed material to be sent in one direction.
This is the most important feature of the present invention. If the rotation of the motor is simply converted into a reciprocating motion, the motion of the sieve will simply be a simple oscillation represented by a sine curve. When the direction of motion is the X direction, a long groove in the Y direction is engraved on a plate that can move in the X direction, and a pin is inserted into the long groove and the pin is rotated, the plate simply vibrates in the X direction.

In the case of simple vibration, the one placed on the sieve (mesh) only moves with the left and right. Because of friction, it moves left and right with the screen. When the direction of movement reverses, it may slip due to the outward force. However, it does not move substantially, and the time average of the coordinates of the center of the pulverized material hardly changes. Here, the simple vibration can be expressed by the following formula.

P (t) = BcosΩt (1)

The horizontal sieve moves in this manner so that the pulverized material on the horizontal sieve diffuses but does not substantially move. The crushed product itself also makes a sinusoidal motion. FIG. 6 shows the relationship between the movement of the shaft and the movement of the net. 6A and 6B show the positions of the pins of the deceleration output shaft driven by the motor. The pin moves in a long groove extending in the Y direction provided in a part of the net frame to reciprocate the net in the left and right directions (X direction). The middle row represents the movement of the net. Since the output shaft rotates counterclockwise, it rotates in the direction in which Θ increases. B shows the state of being at the front. B shows the state rotated by 45 degrees. C has a shaft rotated by 90 °.
I-H is the backward motion, and H-TO-I is the forward motion. Here, the forward movement is a movement toward the X direction. It is a simple vibration and is represented by an extremely simple equation such as equation (1).

The coefficient of friction between the net and the object is effectively different depending on the shape and size of the object. When the speed is slow, the object moves in the same way as a net. If the speed of the net increases, the net will slip and roll, and it will not be able to completely follow the movement of the net. Symmetrical movements like the sine movement cannot carry things. However, the present inventor has found that some sort of asymmetrical movement has a function of carrying an object even if it is a horizontal movement. Since this is the essential point of the present invention, it will be described in detail.

Even if it is called an asymmetrical motion, a motion such as a crank motion does not have a function of carrying an object on it. The crank motion Q can be expressed by the following equation.

Q (t) = acos Ωt + {l ² −a ² sin ² Ωt} ^1/2 (2)

This is because the forward movement and the backward movement have different speeds in the front and the back. The forward and return symmetry is ensured. In such a movement, the object simply follows the net and reciprocates back and forth. When the speed of the net is slow, the object behaves like the net. Since the time average of Q is a constant value, objects on the net do not move substantially. When the horizontal movement of the net becomes intense, the object moves later than the net. The amplitude also becomes smaller. This is because rolling and sliding will occur. Such front-back asymmetry causes objects on the net to move substantially.

However, if the forward and backward paths are asymmetrical, and the forward and backward directions are also asymmetrical, sliding and rolling occur asymmetrically. Therefore, the object is conveyed in substantially one direction, and the pellets are substantially transferred by the horizontal net. It can be carried as desired. Of course, the transfer capacity depends on the object and depends on friction, shape and size. The powder is hard to move, but some lumpy objects like the pellet are easy to move.

Movements that are asymmetrical in the forward and backward directions and asymmetric in the front and rear cannot be created only by rotation of the motor. Here, the forward path (forward) means X
The case of moving in the positive direction of the axis means the case of moving backward (reverse) in the case of moving in the negative direction of the X axis. It is assumed that the net, which moves back and forth in the X direction by the arm, is connected to the rotary shaft, and the net reciprocates by performing a kind of crank motion. “Front” is in the X-axis direction, and the rotation angle Θ of the axis is half of −π to + π. "Back" -the direction of the X axis, and the rotation angle Θ of the axis is + π
We will refer to half of ~ -π. The axis is turning counterclockwise, and if you express the movement of the arm of the axis in four quadrants,

1st quadrant ... Net is in front and backwards 2nd quadrant ... Net is in back and backwards 3rd quadrant ... Net is in back and forwards 4th quadrant ... Net Is ahead and moving forward

Θ = 0 is a turning point from forward to backward. Θ = 180 ° is the turning point from backward to forward. Considering (2) with Ωt = Θ, Q
(T) is an even function of Θ, which is asymmetrical before and after,
It is symmetrical about forward and reverse. Due to such movement, it is not possible to carry things by the horizontally moving net. Even if the net speed increases and the object rolls, rolling occurs symmetrically, so that the net does not move substantially in one direction.

The relative position between the net and the object changes due to the rolling slip. If so, if rolling slip is caused asymmetrically, it may be possible to carry an object on the net in one direction by horizontal motion. During most of the time the net moves back and forth, the object follows the motion of the net. However, the relative velocity is generated at the turning point where the direction of movement is reversed. Here, the object on the net starts rolling. This causes the object to advance F with respect to the net.

After a while after the turning back, the turning point on the opposite side is reached. Here, the relative velocity between the net and the object is generated. This causes the object to move -B to the other side. In one cycle, the object moves relative to the network by FB. If the lead F at the previous turnaround point and the lead B at the back turnaround point are different, that is, FB is 0
Otherwise, the object will move in virtually any direction.

The present inventor has discovered that a horizontally vibrating net can carry an object in one direction by combining a motor and a spring. The net is pulled in the X direction by a spring that just counteracts the decelerated output shaft torque. The output shaft moves quickly in the X direction, which is pulled by the spring. In other words, the spring pulls Θ
In the half cycle S between = π and 2π, the network runs fast. Conversely,
Blocked by springs-slow in X direction. It is slow in the half cycle R of Θ = 0 to π. Such reciprocal asymmetry occurs.

The object does not move in one direction only by such asymmetry of the movement of the intermediate portion. It simply follows.
Acceleration at the turning point is different. This is important. Θ
There is a significant difference in acceleration between the turn at = 0 and the turn at Θ = π. What is the difference? This is shown in FIG. The upper and lower rows show the movement of the pin, and the middle row shows the position of the pin in the X direction.

The network accelerated at the half cycle S and moving at high speed suddenly stops at Θ = 0. Large acceleration occurs. An object on the net jumps up due to the impact and rolls and slides. It moves instantaneously in the X direction with respect to the net. The object eventually slips on the net and stops rolling. The object is relatively moving in the X direction from the initial position. The relative movement amount F is sufficiently large. Net is Θ
From = 0, slowly move in the -X direction. The object begins the same movement as the net.

In the half cycle R, the pulling force of the spring becomes a shackle and the movement of the pin (movement of the net) is slow. I can barely reach Θ = π. Near this, the speed of the net is lowest. It turns back at Θ = π, but almost no acceleration occurs because the rate of change in speed is small. Objects on the net slide in the -X direction. But this is a little. The amount of movement of the object is -B
And Since the change in acceleration is small, B is also small, and F> B. After this, at Θ = π to 2π, the object makes the same motion as the net.

Acceleration is generated at the turning point, but since the magnitude of the acceleration is different, the object practically moves in the X direction.
Due to the asymmetric movement of the repetitive mesh, the pellets are X
It moves in the direction and falls into the pellet container, and the powder passes through the mesh into the powder receiving container. Although the rotation of the motor can be made faster or slower, the acceleration generated at Θ = 0 and π is different because of asymmetry regardless of whether it is fast or slow. Since the force acting on the object is different at the turning point, it also moves substantially horizontally. That is, an object in the horizontal direction can be moved regardless of whether the motor rotation is fast or slow. The higher the motor speed is, the stronger the acceleration becomes, but if the motor speed is too fast, slippage occurs on both sides, making it impossible to carry an object.

This will be described with reference to FIG. The first and third rows show the transition of the pin position due to the rotation of the shaft. The second row shows the displacement of the net in the X direction. Pin positions are indicated by solid lines. The position of the pin when the dash-dotted line shows a single vibration. The displacement of the pin from a simple vibration can cause an asymmetric movement. The source of asymmetric movement is the spring. This constantly pulls the net in the X direction.
Therefore, the speed is fast in the X direction and slow in the -X direction.

The slow half cycle R is the portion of the stain. The fast half cycle S is the part of Tsukawayo. Although it is a half cycle, the time itself is different. The slow half-cycle time R is long and the fast half-cycle time S is short. Acceleration is the second derivative of displacement. In the case of the simple vibration of (1), the displacement cos Θ is given a negative value, and -cos Θ is the acceleration. This is the net acceleration.

It is difficult to intuitively consider the motion of the pulverized material by the acceleration of the net. Therefore, consider the acceleration (or inertial force) of the object with respect to the net. This is the negative of acceleration. That is, in the case of simple vibration, it can be said that the displacement and the object acceleration have the same change. The force is the product of acceleration and mass. The inertial force acting on the object is obtained by multiplying the object acceleration by the mass. The object receives an inertial force that moves forward when it turns back. It receives inertial force toward the back at the turning point behind. Since these are the same, the object does not move substantially.

When the spring is pulled in the X direction as shown in FIG. 7, the movement of the dust roller is hindered. The movement of Tsuwakayo is accelerated. Inertial force, or acceleration, is a problem. Positive movement stops suddenly at Yo. Here, a strong positive inertial force is applied to the object. The object is flipped forward. The strong inertial acceleration at the yaw is an important element of the present invention. The backward acceleration is working for a long time. The bending of the curve determines the sign of acceleration. If it is convex downward, downward inertial force acts, and if it is convex upward, upward inertial force acts. A downward inertial force works at Rinuru Wotsuka.

Since the inertial force acts on the object, the object does not immediately move with respect to the net. When the inertial force is small to some extent, the frictional force is superior. Therefore, the object does not move. When the inertial force exceeds the frictional force, the object jumps up, jumps up, slides, and rolls. Since the acceleration at the yaw point is large, the inertial force overcomes the frictional force at this time, and the object relatively moves in the X direction.

In Rinuruwatsuka, the object feels acceleration in the opposite direction. The acceleration of the tool is quite large. However, it is less than or equal to the frictional force. The object does not slide in the -X direction or only slides a little. Eventually, the sliding motion at the Y-point predominates and the object moves forward.

Acceleration is the derivative of velocity and velocity is the derivative of displacement. The average acceleration can be calculated by integrating this, substituting the initial value Θ and the final value Θ + 2π, and subtracting the former from the latter. The integral is velocity. Since displacement is a periodic function, velocity is also a periodic function. Therefore, the average value of acceleration is always 0. This is clear from the nature of the periodic function. The average is 0 as a whole, and the forward inertial force and the backward inertial force are the same when time averaged.

However, there is an asymmetric force called friction. The object moves relative to the net only when the inertial force that exceeds the frictional force acts. An object moves only when a strong inertial force such as the Y-point is generated. The present invention moves the object in one direction by utilizing the asymmetry of the frictional force.

In the objects described in the embodiments, since the long groove has a width, the pin makes a minute reciprocating motion (vibration) near the return point. This is shown in FIG. The flat part of the yotare shown in Fig. 7 vibrates like a naram. The acceleration in this case is shown in the lower row. The acceleration at Na is extremely large.
Ramu also vibrates the acceleration. Downward acceleration works from the bottom to the bottom. The integral of one cycle of acceleration is 0, but the object instantaneously moves forward at this time because the acceleration at Na is huge. It may move backward with O or LA. But this is small. Thus, the present invention utilizes the asymmetry of frictional force to propel an object in one direction.

There is no such thing as a special ratchet in the net. It is a simple net. However, by making the movement itself asymmetric, the object can be transported in one direction.
This is why it is possible to carry objects even though the net is horizontal.

[0043]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dust remover according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a dust remover according to an embodiment of the present invention, FIG. 2 is a plan view of a sieve portion with a hopper removed, and FIG. 3 is a front view of the dust remover. 4 is an enlarged vertical sectional view showing a lower guide roller portion, and FIG. 5 is an enlarged vertical sectional view showing a horizontal guide roller portion.

The entire apparatus is surrounded by a metal casing 1. A pyramid-shaped hopper 2 is detachably provided in an opening on the upper surface. Immediately below the opening at the bottom of the hopper 2, a sieve 5 including a horizontal net 3 and a frame 4 is provided so as to be movable in the horizontal direction. The screen 5 is horizontal and moves horizontally, which is a feature of the present invention.

The net 3 is a combination of the upper net 6 and the lower net 7. The upper net 6 has a fine mesh and serves to separate the powder and the pellet. The lower net has coarse mesh. A powder receiving container 8 is installed directly below the net 3 so as to be removable. It can be pulled out by holding the puller 10. A pellet container 9 is placed in front of the sieve 5. It is simply left in place and when it is full, it is manually carried away and fed to the molding machine with the virgin material. Instead of the pellet container, an air transportation device may be connected to automatically convey the pellets to the hopper of the molding machine.

On the bottom surface of the casing 1, an adjuster 11,
The casters 12 are attached. Casters 12 make it easy to move. Casing 1 by adjuster 11
Can be horizontal.

In the space between the upper net 6 and the lower net 7 of the sieve 5,
A suitable number of tapping balls 13 are accommodated. This prevents powder clogging by hitting the upper net from below. The screen frame 4 is composed of a side frame 14 and a rear frame 15 so that the screen 3 can be supported. The side frame 13 is supported by a guide roller so that it can move in parallel in the longitudinal direction (X direction).

A movable plate 16 is attached to the rear end of the rear frame 15 by a bolt 1.
7 fixed. The movable plate 16 is provided with a long groove 18 in a direction (Y direction) perpendicular to the net movement direction (X direction). In the long groove 18, a pin 1 rotated by a motor
The tip of 9 is inserted. Although the pin 19 is rotated by the eccentric cam, the rotation of the pin is not hindered because the length of the long groove is longer than the diameter of movement of the pin. The short side of the long groove 18 is about 1.8 times the diameter of the pin, and the pin can also move in the short side direction of the long groove.

The structure of the lower guide roller 20 will be described with reference to FIG. This supports the side frame 14 of the screen from below. Bearings 26 are used to allow longitudinal movement.
The bolt 25 penetrates the bearing 26 and the bush 27, and further penetrates the hole of the casing 1. A nut 28 is screwed onto the tip of the bolt 25. Bolt head 29 and bush 2
The inner ring of the bearing 26 is fixed between 7 and 7. The outer ring of the bearing 26 is in contact with the side frame 14. There are many balls between the inner ring and the outer ring, ensuring smooth rotation of the outer ring.

The structure of the lateral guide roller 30 will be described with reference to FIG. This is bolt 31, bearing 32, bush 33,
It includes a bracket 34 and the like. L-shaped bracket 34
Are welded to the side surface of the casing 1. The bearing 32 and the bush 33 are passed through the bolt 31, inserted into the vertical through hole 38 of the bracket 34, and fixed by the nut 39. The inner ring of the bearing is sandwiched between the bolt head 35 and the bush 33. The outer ring faces the outer surface of the side frame 14.

At times, it contacts the outer surface so that the frame does not come off in the lateral direction. Lower guide roller 20 and lateral guide roller 3
With 0, the net 3 can be smoothly moved in the front-back direction.
Further, a retaining screw 21 projects laterally from the side wall of the casing just above the frame 14 so that the frame 4 does not jump upward. This can be replaced by a guide roller. A mesh frame 36 is provided on the outer periphery of the mesh 3, and is fixed to the sieve frame 4 by welding and bolts.

The side frame 14 is movably supported by the guide rollers 20 and 30, and a mechanism for moving the side frame 14 back and forth will be described below. There are two. One is the spring 22 and the other is the motor 40. Springs 22 are provided on both sides of the device. Side frame 14 at one end
Is stopped at the front end 23 of the. The other end is fixed by screws 24 to a suitable portion of the casing. Spring 22
Always pulls the net forward (X direction).

The motor 40 is housed at the inner rear end of the casing so that its shaft is vertical. The rotation of the motor 40 is reduced by the reduction gear 41. An eccentric cam 43 is fixed to the output shaft 42 of the speed reducer 41. The pin 19 is attached to one location of the eccentric cam 43. A collar 56 is fitted at the tip of the pin 19, and the collar 56 is movable plate 1.
The inner peripheral surface of the long groove 18 of 6 rolls. When the eccentric cam 43 rotates, the pin also rotates, whereby the movable plate 16 moves in the X direction and the -X direction.

The power supply unit 44 is provided in front of the casing on the opposite side. This allows the rotation speed of the motor to be continuously changed by changing the current, voltage or frequency applied to the motor 40. The front panel has a switch 45 and a speed adjusting knob 46. In this embodiment, the motor speed can be continuously changed in the range of 0 to 2800 rpm by the speed adjusting knob. The speed reducer used is 1/4. In this case, the eccentric cam 43 is 0 to 700 rp
The rotation speed can be continuously changed within the range of m.

It suffices to select an appropriate speed of rotation. Higher rpm is not the better thing. When the rotation is low, the force of the motor is weak and the force of the spring exerts a strong influence on the motor, the acceleration at the front turning point Θ = 0 is large, and the difference from the acceleration at the rear turning point Θ = π is large. That is, the difference FB of forces acting on the object becomes large. The movement of one cycle is slow and the movement is slow. However, the object steadily moves forward.

In the case of low speed rotation, the force of the motor is particularly weak as compared with the spring, so the output shaft may oscillate 2-3 times at the front turning point Θ = 0. The net is sent forward by a large force that is the sum of the rotational force of the motor and the restoring force of the spring, and it suddenly stops, causing a large impact and making a few reciprocating motions. This is shown in FIG.
During the rocking, the speed of the net changes so much that the object keeps sliding and makes a big forward move. In other words, the object does not stand still with respect to the net because it moves so strongly. At the turnaround Θ = π on the opposite side, the speed of the motor is slow and the speed change is small so that the object does not slip. That is, B is close to 0. The value of FB becomes large. In low-speed rotation, the amount of one transition is large.

However, if the speed is too low, it is difficult for the motor to rotate against the tension of the spring. Since the cycle becomes long, the speed of conveying the object becomes slow. On the other hand, when the rotation speed is high, the inertia of the object is greatly effective, and the net and the object always slip. Furthermore, the force of the spring loses the force of the motor, preventing asymmetrical rotation. The net moves like a simple vibration. Then, the movements to both sides compete. The difference in length between the half cycle R and the half cycle S also becomes small. The net moves fast back and forth, but continues to slide, so the movement of the object becomes rather dull and unable to follow the net.

There is also a difference due to weight. Since a heavier object receives frictional force from the net and is less likely to slip, it has the same motion as Θ = 0 to π or Θ = π to 2π. In this case, the difference in speed at the turning point appears sharply on the object, so that FB becomes large. Since a light object has a weak friction by nature, it tends to slip on the net even if it is slow. Since it cannot follow the movement of the net, the action due to the difference in speed does not appear strongly at the turning point. Therefore, a light object has a slow transition in one direction. When the net is reciprocated at a speed slow enough to match the force of the spring, the asymmetry of the front-rear acceleration sharply appears. Interesting because it is a collective movement of pellet powder.

[0059]

EFFECTS OF THE INVENTION The dust remover of the present invention holds the net horizontally without inclining it and horizontally reciprocates it. Therefore, the height of the pellet container and the height of the powder receiving container can be increased. Schematic diagrams are shown in FIGS. 9 and 10. The height of the entire device is limited by the requirement that it be placed directly below the outlet of the crusher. In the case of the conventional inclined sieve, the height h is small because the pellet container is placed at the outlet of the sieve as shown in FIG.
The powder container is also low. Since the maximum storage capacity is small, it must be replaced manually frequently. By horizontally moving the sieve as shown in FIG. 10, both the powder receiving container and the pellet container can be made tall. Since it does not fill up quickly, it can be replaced less frequently. You can save manpower.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a dust remover according to an embodiment of the present invention.

FIG. 2 is a plan view of the same hopper except for a hopper and an upper plate.

FIG. 3 is a front view of the same thing.

FIG. 4 is a vertical cross-sectional view of the vicinity of a lower guide roller.

FIG. 5 is a vertical cross-sectional view of the vicinity of a horizontal guide roller.

FIG. 6 is a diagram showing the movement of the pin and the position of the mesh in a corresponding manner when the pin inserted into the long groove makes a simple uniform rotational movement and the net makes a simple vibration.

FIG. 7 is a diagram showing the movement of the pin and the position of the net in a corresponding manner when the pin inserted into the long groove makes a rotational motion and the net makes an asymmetrical motion by a spring.

FIG. 8 is a diagram showing a network position and a temporal change in acceleration in the embodiment in association with each other.

FIG. 9 is a schematic cross-sectional view of an apparatus according to a conventional example for explaining that a powder receiving container and a pellet container are reduced in size when an inclined net is used.

FIG. 10 is a schematic view of an apparatus for explaining that the powder receiving container and the pellet container can be made large in the case of the present invention using a horizontal net.

[Explanation of symbols]

 1 Casing 2 Hopper 3 Net 4 Frame 5 Sieve 6 Upper net 7 Lower net 8 Powder container 9 Pellet container 10 Puller 11 Adjuster 12 Castor 13 Tapping ball 14 Side frame 15 Rear frame 16 Movable plate 17 Bolt 18 Long groove 19 Pin 20 Lower guide Roller 21 Locking screw 22 Spring 23 Front end of frame 24 Screw 25 Bolt 26 Bearing 27 Bush 28 Nut 29 Bolt 30 Horizontal guide roller 31 Bolt 32 Bearing 33 Bush 34 Bracket 36 Net frame 38 Through hole 39 Nut 40 Motor 41 Reducer 42 Output Shaft 43 Eccentric cam 44 Power supply unit 45 Switch 46 Speed adjustment knob 47 Plug 48 Cord

Claims (1)

[Claims] 1. A device for separating crushed plastics into pellets and powders, which supports a screened mesh through which the powders pass and does not pass through the pellets so as to be capable of horizontally reciprocating motion, and the speeds in the forward and backward paths are increased. A dusting machine characterized in that an object on the net is moved in one direction by reciprocating so as to be asymmetric.