JP2845395B2 - Powdering machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder removing machine for removing powder from crushed plastic pellets. In plastic injection molding, the plastic that has solidified in the path leading the plastic into the mold becomes a runner. Presents various tree structures depending on the mold structure. Since this is unnecessary, it is collected and reused. In addition, defective products are produced even with plastic molded products. Defective products are also unnecessary and are reused. In this case, cut the runners and defective products into appropriate sizes and then put them into the crusher,
Crush into fine pellets. The crushed pieces (pellets) are mixed with a virgin raw material, heated again and melted, and used as a molding material.

[0002] In a pulverizer, a runner or a product is pulverized by a cutting blade rotating at a high speed, so that a large amount of powder is generated. The powder does not melt when heated and interferes with the mixing and melting of the pellets. It is necessary to remove the powder from the pulverized material in advance and use it as a recycled material. The present invention relates to an apparatus for effectively removing powder from pulverized material.

[0003]

2. Description of the Related Art This is a type of sieve because one material is extracted from a mixture of two types having different sizes and densities. When the mesh is vibrated and the pulverized material is supplied thereon, the powder smaller than the mesh falls through the mesh and the pellets roll on the mesh to reach the outlet. Thus, the powder and the pellet are discriminated. Several proposals have been made regarding a vibrating sieve that separates powder and particles. Some nets are flat or cylindrical. The net itself may be a nylon net or a punched metal. There are several prior arts. Here, a typical cylindrical sieve device and a plane inclined sieve device will be described.

[Conventional Example: Cylindrical sieve device] A cylindrical mesh made of stainless steel is rotated around an inclined axis, and pulverized material is introduced from an upper opening. The powder falls through the mesh. The pellets slide down the mesh and come out to the exit. Powder and pellets can be easily distinguished. As the net rotates, the pellets roll by gravity and move downward. The pellets enter the box located at the lower exit. Even if it rotates, the net is closed by the powder. For this reason, a method has been devised such as intermittently hitting the net with a hammer to knock the powder off the net. Since the net rotates obliquely, the pellets gradually fall down by their own weight.

[Conventional example: large-size flat inclined screen device] A perforated metal, stainless steel mesh, nylon mesh or the like is fixed to a flat frame, the frame is supported obliquely, and the net is reciprocated.
Because of the slant, the powder and pellets roll over the net and fall. The powder falls directly below the net and the pellets enter the exit box. Many such flat-plate inclined sieves already exist.

[Conventional example: Small inclined reciprocating sieve device] The vibrating sieve as described above has already been used in many cases, but all of them are large devices and can be directly installed under the discharge port of a crusher. Can not. The outlet of the crusher is at the lowest point of the casing. The distance from the ground is only tens of cm at most.
Large vibrating sieve devices cannot be placed just below the outlet of the crusher. Then, a shallow container is placed at the discharge port of the crusher to store the crushed material, and the work must be sometimes discarded on a vibrating screen.

[0007] There is a pressing need for a powderer that is smaller, that can easily separate the powder and pellets from the crushed material, and that can be placed below the outlet of the crusher. If a device having a low height and capable of separating powder and pellets at a high classification rate can be provided, it can be placed at the discharge port of the pulverizer.

In order to meet such a purpose, the present applicant has proposed a small-sized dusting machine (Japanese Patent Application No. 6-14832, Japanese Unexamined Patent Application Publication No.
−204583). It consists 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 pulverized material discharged from the discharge port of the pulverizer enters the hopper and rolls obliquely down the double net. The powder falls over the net and the pellets reach the outlet. It is stored in the pellet container at the outlet. As the net reciprocates, the pulverized material can gradually advance in one direction.

The double mesh is used to prevent clogging by fixing the lower mesh and moving the upper mesh. This is left under the pulverizer, and when the pellet container is full, it is thrown into the raw material hopper of the molding machine or transferred to a used pellet storage container. Very convenient because it is short and can be placed under the crusher. Conventionally, a crushed material container is placed under the discharge port of the crusher, and when the crushed material container is full, the crushed material container is manually carried and thrown into the hopper of the vibrating sieve, so that labor can be omitted. Great labor saving effect.

[0010]

However, the above-mentioned duster of the applicant still has drawbacks. Since the net is inclined, some pellet containers at the outlet of the net must be shallow. The height of the net below the hopper, d =
The height of the exit net is reduced by Lsinｓ. Subsequently, a pellet container is provided. Pellet containers must be shallow. If it is a shallow container, the pellets will immediately accumulate and fill up. Must be replaced frequently.

In the case of pellets, it is possible to convey automatically from the outlet of the powdering machine and to put it into the molding machine. But there is also a problem with the powder. Since the net is inclined, the size of the powder receiving container is also small. If the powder receiving container is to be provided 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 container must be monitored frequently, and when it becomes full, it must be removed and transferred to another container.

This is still inconvenient because frequent manual work is required. If the capacity of the powder receiving container can be increased, the frequency of replacement work can be reduced. SUMMARY OF THE INVENTION It is an object of the present invention to propose a powder removing machine which can increase the capacity of a pellet container and a powder receiving container while satisfying a condition of being placed under a discharge port of a crusher. It is a second object of the present invention to provide a device 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 powdering machine that can easily change the classification speed depending on the amount of the pulverized material.

[0013]

According to the present invention, the powder is sent in one direction by reciprocating the net horizontally and asymmetrically. 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 height of the net at the outlet position is high. Tall pellet containers can be placed. You can also place a tall powder container. Since the volume of the container can be increased, the frequency of collection of the pellets and powder can be reduced. The number of operations requiring human labor can be reduced.

[0014]

DETAILED DESCRIPTION OF THE INVENTION The present invention holds a sieve horizontally, not diagonally, and causes it to reciprocate asymmetrically. The crushed material can be sent in one direction by asymmetric reciprocating motion.
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 is simply a simple oscillation represented by a sine curve. When the direction of the movement is the X direction, a long groove in the Y direction is carved in the plate that can be moved in the X direction, and when the pin is inserted into the long groove and the pin is rotated, the plate simply vibrates in the X direction.

In the case of a simple vibration, an object placed on a sieve (mesh) only moves left and right. It moves left and right with the sieve due to friction. When the direction of the movement is reversed, an outward force is exerted, so that the vehicle may slip. However, it does not substantially move, and the time average of the coordinates of the center of the crushed material hardly changes. Here, the simple vibration can be expressed by the following equation.

P (t) = BcosΩt (1)

The horizontal sieve makes such a movement, and the pulverized material thereon diffuses but does not substantially move. The crushed material itself also moves in a sine wave. FIG. 6 shows the relationship between the movement of the shaft and the movement of the net. The first and third rows in FIG. 6 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, and reciprocates the net right and left (X direction). The middle row shows the movement of the net. Since the output shaft turns counterclockwise, it turns in the direction that Θ increases. A shows the state in which A is the foremost. B shows a state rotated by 45 degrees. C has a shaft rotated by 90 °.
(A)-(e) is a backward movement, and (e) is a forward movement. 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 friction coefficient between the net and the object is effectively different depending on the shape and size of the object. While the speed is slow, the object moves in the same way as the net. As the speed of the net increases, slipping and rolling occur, making it impossible to completely follow the movement of the net. Symmetrical movements such as sinusoidal movements cannot carry things. However, the present inventor has found that some sort of asymmetrical movement, even a horizontal movement, has the effect of carrying objects. This is the main point of the present invention and will be described in detail.

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

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

This is the only difference between the forward movement and the backward movement of the forward and backward movements. The symmetry between the outbound and return trips is ensured. In such a movement, the object simply reciprocates back and forth following the net. When the speed of the net is slow, the object moves in the same way as the net. Since the time average of Q is a constant value, objects on the net do not substantially move. If the horizontal movement of the net becomes intense, things will move later than the net. The amplitude also decreases. Rolling and slipping occur. With such a front-back asymmetry, objects on the net do not move substantially.

However, if the asymmetrical movement is made in the forward path and the return path and also asymmetrical in the front and rear directions, the sliding rolling occurs asymmetrically. It can be carried around. Of course, the carrying capacity depends on the object and differs depending on the friction, shape and size. The powder is hard to move, but a certain mass of object such as a pellet is easy to move.

The asymmetrical movement in the forward and backward paths and the asymmetrical movement in the forward and backward directions cannot be produced only by the rotation of the motor. Here, the forward path (forward) is X
It refers to the case of moving in the positive direction of the axis, and the return path (reverse) refers to the case of moving in the negative direction of the X axis. The net that moves in the X direction by the arm and the rotation axis are connected, and the net reciprocates by performing a kind of crank motion. “Before” is in the X-axis direction, and the rotation angle 軸 of the axis is half of −π to + π. "Back"-the direction of the X axis, and the rotation angle 回 転 of the axis is + π
It means half of -π. The axis rotates counterclockwise, and the movement of the arm of the axis is represented by four quadrants.

The first quadrant: the net is in front and moving backwards. The second quadrant: the net is in the rear and moving backwards. The third quadrant is the net behind and moving forward. The fourth quadrant: net Is ahead and moving forward

Θ = 0 is a turning point from forward to backward. Θ = 180 ° is a turning point from reverse to forward. Considering (2) with Ωt = Θ, Q
(T) is an even function of Θ, which is asymmetrical around,
It is symmetric about forward and backward. With such a movement, things cannot be carried by a horizontally moving net. Even if the speed of the net increases and the object rolls, it does not substantially move in one direction because the rolling occurs symmetrically.

The relative position between the net and the object changes due to the rolling slip. If a rolling slip occurs asymmetrically, an object on the net could be moved in one direction by horizontal movement. During most of the time the net moves back and forth, the object follows the motion of the net. However, a relative speed occurs at a turning point where the direction of movement is reversed. Here, objects on the net begin to roll. This causes the object to advance F with respect to the net.

A short time after the return, the return point is reached on the opposite side. Here, the relative speed between the net and the object occurs. This moves the object to the opposite side by -B. In one cycle, the object moves relative to the net by FB. If the advance F at the preceding turning point is different from the advance B at the following turning point, that is, FB is 0
If not, the object moves in virtually any direction.

The present inventor has discovered that by combining a motor and a spring, a horizontally oscillating net can carry an object in one direction. The net is pulled in the X-direction by a spring that just antagonizes the torque of the output shaft that has been decelerated. The output shaft moves fast in the X direction, which is pulled by a spring. In other words, the spring pulls.
The network runs fast in the half period S between = π and 2π. Conversely,
Moves slowly in the -X direction, blocked by a spring. 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 the asymmetry of the movement of the intermediate portion. It simply follows.
The acceleration at the turning point is different. This is important. Θ
There is a remarkable difference in acceleration between the return at = 0 and the return at Θ = π. What are the differences? FIG. 7 shows this state. 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 net accelerated in the half cycle S and moving at a high speed suddenly stops when Θ = 0. Large acceleration occurs. An object on the net jumps and rolls due to the impact. It moves instantaneously in the X direction relative to the net. The object eventually slides 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. The 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 movement of the pin (movement of the net) is sluggish due to the tension of the spring acting as a shackle. It is finally possible to reach Θ = π. Near this the net speed is at a minimum. Turns back at Θ = π, but almost no acceleration occurs because the rate of change in speed is small. Objects on the net slide and roll in the -X direction. But this is slight. The amount of movement of the object is -B
And Since the change in acceleration is small, B is also small, and F> B. Thereafter, when Θ = π to 2π, the object moves in the same way as the net.

Although acceleration occurs at the turning point, the object moves substantially in the X direction because the magnitude of the acceleration is different.
Due to the asymmetric movement of the repetitive net, the pellet becomes X
The powder moves in the direction and falls into the pellet container, and the powder passes through the mesh and enters the powder receiving container. Although the rotation of the motor can be made faster or slower, there is asymmetry whether it is faster or slower, so that the accelerations generated when Θ = 0 and π are different. Since the force acting on the object at the turning point is different, it also moves substantially in the horizontal direction. That is, the object in the horizontal direction can be shifted regardless of whether the rotation of the motor is fast or slow. The higher the motor speed, the greater the magnitude of the acceleration. However, if the speed is too high, 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 position of the pin 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 dashed line indicates the position of the pin in the case of simple vibration. The displacement of the pin from the simple vibration can cause asymmetric movement. The source of the asymmetric movement is the spring. This constantly pulls the net in the X direction.
Therefore, it moves fast in the X direction and moves slowly in the −X direction.

The slow half cycle R is the part of the dirt. The fast half cycle S is the part of Tsuwakayo. Although it is a half cycle, the time itself is different. The time R of the slow half cycle is long, and the time S of the fast half cycle is short. The acceleration is the second derivative of the displacement. In the case of the simple vibration of (1), minus is added to the displacement cos #, and -cos # is the acceleration. This is the net acceleration.

It is difficult to intuitively consider the movement of the crushed material with the acceleration of the net. Therefore, consider the acceleration (or inertial force) of the object with respect to the net. This is minus the acceleration. That is, in the case of the simple vibration, it can be said that the displacement and the object acceleration change the same. The force multiplied by the mass is the force. The inertial force on the object is obtained by multiplying the object acceleration by the mass. The object receives a forward inertial force by turning forward. At the rear turning point, it receives the inertial force that moves backward. Since these are the same, the object does not substantially move.

When the spring is pulled in the X direction as shown in FIG. 7, the movement of the chinillus is hindered. Tsuwakayo's movement is accelerated. The problem is inertial force, that is, acceleration. Positive movement suddenly stops in Yo. Here, a strong forward inertial force is applied to the object. The object is flipped forward. Strong inertial acceleration at yaw is an important element of the present invention. The backward acceleration works for a long time. The sign of the acceleration is determined by the curvature of the curve. If it is convex downward, a downward inertial force acts, and if it is convex upward, an upward inertial force acts. In Lynurutwaka, downward inertial force works.

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 friction force is superior. Object does not move. When the inertial force exceeds the friction force, the object jumps, jumps, slides and rolls. Since the acceleration at the yaw point is large, the inertia force overcomes the frictional force at this time, and the object relatively moves in the X direction.

In Rinulutsukaka, an object senses acceleration in the opposite direction. The acceleration of tsu is quite large. However, it is less than or equal to the friction force. The object does not slide or only slightly slides in the -X direction. Eventually, the rolling at the Y-point prevails, and the object will move forward.

Acceleration is the derivative of velocity, and velocity is the derivative of displacement. The average of the acceleration can be obtained by integrating this, substituting the initial value Θ and the end 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 the acceleration is always 0. This is evident from the nature of the periodic function. The average as a whole is 0, and the forward inertia force and the backward inertia force are the same when averaged over time.

However, there is an asymmetric force called friction. The object moves relative to the net only when inertial force exceeding the frictional force acts. An object moves only when a strong inertial force is generated, as at the point of yo. The present invention utilizes the asymmetry of frictional force to move an object in one direction.

In the object described in the embodiment, the pin makes a small reciprocating motion (vibration) near the return point Y due to the width of the long groove. This is shown in FIG. The flat part of the warp in FIG. 7 vibrates like a narwagon. The acceleration in this case is shown at the bottom. The acceleration at Na is especially big.
Ramu also oscillates in acceleration. A downward acceleration works from no to ne. The integral of one cycle of the acceleration is 0, but the object moves momentarily forward at this time due to the huge acceleration at the na. It may move backwards with o and ra. But this is small. Thus, the present invention utilizes the asymmetry of the frictional force to propel the 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 objects can be carried when the net is horizontal.

[0043]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a powder removing machine according to an embodiment of the present invention. FIG. 1 is a vertical sectional view of a dusting machine according to an embodiment of the present invention, FIG. 2 is a plan view of a sieve portion when a hopper is removed, and FIG. 3 is a front view of the dusting machine. 4 is an enlarged longitudinal sectional view showing a lower guide roller, and FIG. 5 is an enlarged longitudinal sectional view showing a horizontal guide roller.

The entire device is surrounded by a metal casing 1. A pyramid-shaped hopper 2 is detachably provided at the opening on the upper surface. Immediately below the opening at the bottom of the hopper 2, a sieve 5 composed of a horizontal net 3 and a frame 4 is provided so as to be movable in the horizontal direction. The sieve 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 is fine and acts to separate the powder and the pellet. The lower net is coarse. Immediately below the net 3, a powder receiving container 8 is installed 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 carried away by hand, when it is full, simply placed, and fed to the molding machine with virgin material. A pellet may be automatically transferred to a hopper of a molding machine by connecting an air transport device instead of the pellet container.

An adjuster 11 is provided on the bottom of the casing 1.
The casters 12 are attached. The casters 12 facilitate movement. Casing 1 by adjuster 11
Can be horizontal.

In the space between the upper screen 6 and the lower screen 7 of the sieve 5,
An appropriate number of tapping balls 13 are accommodated. This prevents powder clogging by tapping the upper net from below. The screen frame 4 of the sieve includes a side frame 14 and a rear frame 15 so that the screen 3 can be supported. The side frames 13 are supported by guide rollers so as to be able to move in parallel in the longitudinal direction (X direction).

At the rear end of the rear frame 15, a movable plate 16 is
7 fixed. A long groove 18 is formed in the movable plate 16 in a direction (Y direction) perpendicular to the direction of movement of the net (X direction). A pin 1 rotated by a motor is provided in the long groove 18.
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 the 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 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 sieve from below. Bearings 26 are used to allow longitudinal movement.
A bolt 25 passes through the bearing 26 and the bush 27, and further passes through a hole in the casing 1. A nut 28 is screwed into the tip of the bolt 25. Bolt head 29 and bush 2
7, the inner race of the bearing 26 is fixed. The outer ring of the bearing 26 is in contact with the side frame 14. There are many balls between the inner and outer rings to ensure smooth rotation of the outer ring.

The structure of the lateral guide roller 30 will be described with reference to FIG. These are bolt 31, bearing 32, bush 33,
It comprises a bracket 34 and the like. L-shaped bracket 34
Is welded to the side surface of the casing 1. A bearing 32 and a bush 33 are passed through a bolt 31, inserted into a vertical through hole 38 of a bracket 34, and fixed by a 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 side surface of the side frame 14.

Sometimes, the frame comes into contact with the outer surface so that the frame does not come off in the horizontal direction. Lower guide roller 20 and lateral guide roller 3
0 enables the net 3 to move smoothly in the front-rear direction.
In order to prevent the frame 4 from jumping upward, a retaining screw 21 projects laterally from the side wall of the casing just above the frame 14. This can be replaced by a guide roller. A net frame 36 is provided on the outer periphery of the net 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. A mechanism for moving the side frame 14 back and forth will be described below. There are two. One is a spring 22 and the other is a motor 40. Springs 22 are provided on both sides of the device. One end is side frame 14
At the front end 23. The other end is fixed to an appropriate part of the casing by a screw 24. Spring 22
Is always drawing the net forward (X direction).

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

The power supply section 44 is provided in front of the opposite casing. In this case, the number of rotations of the motor can be continuously changed by changing the current, voltage or frequency applied to the motor 40. A switch 45 and a speed adjustment knob 46 are provided on the front panel. In this embodiment, the speed of the motor can be continuously changed in the range of 0 to 2800 rpm by the speed adjusting knob. The speed reducer is 1/4. In this case, the eccentric cam 43 is set at 0 to 700 rpm.
The number of revolutions can be continuously changed in the range of m.

It suffices to select an appropriate number of rotations. It is not that higher rotation speed is better. When the rotation is low, the power of the motor is also weak, and the force of the spring has a strong influence on the motor. The acceleration at the previous 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 between the forces acting on the object increases. The movement of one cycle becomes long and the movement is slow. However, the object moves steadily forward.

In the case of low-speed rotation, the output shaft may swing two or three times at the front turning point Θ = 0 since the power of the motor is particularly weak as compared with the spring. The net is sent forward by a large force, which is the sum of the rotational force of the motor and the return force of the spring, which suddenly stops, causing a large impact and making small reciprocating motions several times. This is shown in FIG.
During the swing, the speed of the net changes so much that the object continues to slide and travels forward. In other words, the object is not stationary with respect to the net because of the rapid movement. When the return angle 折 り = 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 increases. At low speed rotation, the amount of one transition is large.

However, if the speed is too low, the motor is difficult to rotate against the tension of the spring. Since the cycle becomes longer, the speed of transporting the object itself becomes slower. Conversely, when the rotation speed is high, the inertia of the object is greatly effective, and the net and the object always slide. Further, the force of the spring is less than the force of the motor, and the asymmetric rotation is not performed. The net moves like a simple vibration. Then the movements to both antagonize. The difference between the lengths of the half cycle R and the half cycle S also decreases. The net moves quickly back and forth, but keeps slipping, so that the movement of the object becomes rather slow and cannot follow the net.

There is also a difference due to the weight. The heavier the object is, the less it slips due to the frictional force by the net, so that the same motion as the net occurs at Θ = 0 to π or Θ = π to 2π. In this case, since the speed difference at the turning point appears sharply on the object, the FB increases. Light objects are inherently weak in friction, so they are prone to slipping against the net, even at fairly slow speeds. Since it cannot follow the movement of the net, the effect due to the speed difference at the turning point does not appear strongly. For light objects, the transition in one direction is slow. When the net is reciprocated at a speed slow enough to balance the force of the spring, the asymmetry of the front-back acceleration is sharply manifested. Interesting and collective movement of pellet powder.

[0059]

The powder removing machine of the present invention holds the net horizontally without tilting and reciprocates horizontally. For this reason, the height of the pellet container and the height of the powder receiving container can be increased. 9 and 10 show schematic diagrams. The requirement that it be located directly below the outlet of the crusher limits the overall height of the device. 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 lower. Since the maximum storage capacity is small, it must be frequently replaced manually. By moving the sieve horizontally 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, the frequency of replacement can be reduced. You can save manpower.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a powder removing machine according to an embodiment of the present invention.

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

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

FIG. 4 is a longitudinal sectional view near a lower guide roller.

FIG. 5 is a vertical cross-sectional view near a horizontal guide roller.

FIG. 6 is a diagram showing the movement of the pin and the position of the net in a case where the pin inserted in the long groove makes a simple constant-speed rotational motion 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 case where the pin inserted into the long groove makes a rotary motion and the net makes an asymmetrical motion by a spring.

FIG. 8 is a diagram showing the position of the net and the time change of the 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 become smaller when an inclined net is used.

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

[Explanation of symbols]

 Reference Signs List 1 casing 2 hopper 3 net 4 frame 5 sieve 6 upper net 7 lower net 8 powder receiving container 9 pellet container 10 puller 11 adjuster 12 caster 13 tapping ball 14 side frame 15 rear frame 16 movable plate 17 bolt 18 long groove 19 pin 20 lower guide Roller 21 Prevention screw 22 Spring 23 Front end of frame 24 Screw 25 Bolt 26 Bearing 27 Bush 28 Nut 29 Bolt 30 Lateral guide roller 31 Bolt 32 Bearing 33 Bush 34 Bracket 36 Net frame 38 Through hole 39 Nut 40 Motor 41 Reduction gear 42 Output Shaft 43 Eccentric cam 44 Power supply unit 45 Switch 46 Speed adjustment knob 47 Plug 48 Code

Claims (1)

(57) [Claims] 1. A device for separating a pulverized plastic material into pellets and powder, which supports a screened mesh through which the powder passes and through which the pellet does not pass so as to be able to reciprocate horizontally, and has a speed in the forward path and the return path. By reciprocating so as to be asymmetric, the pellets on the net are changed in one direction, and a pellet having a height substantially equal to the height of the sieve can be placed in the traveling direction of the pellets to continuously collect the pellets. And a powder receiving container having a horizontal opening having a height close to the height of the sieve under the sieve.