JP4889561B2 - Roll screen - Google Patents

Description

  The present invention relates to a roll screen that efficiently screens objects to be treated such as excavated earth and sand, clay lumps including hard lumps such as stones and gravel.

  For example, a roll screen is known as a device for sieving an object to be treated such as excavated earth and sand or clay lump excavated by a shield method or the like. The roll screen discharges the large hard lump (hereinafter referred to as large-diameter material) mixed in the material to be processed to the outside by sieving, thereby making it possible to supply soil with the desired particle size or facilitate transportation. It is used to

  A conventional roll screen mainly includes a plurality of rotating rolls arranged in parallel at predetermined intervals, a driving means (for example, a driving motor) for rotating the rotating rolls, and a chain connecting the driving means and the rotating rolls. Have. The rotating roll includes a cylindrical roll shaft and a plurality of disk-shaped rotating disks attached to the outer periphery of the roll shaft at right angles to the axial direction. That is, the gap formed between the roll shafts and between the rotating disks is “sieving”.

  In the conventional roll screen, when the driving means is driven, each rotary roll rotates through the chain, and performs sieving while conveying the workpiece from the upstream side to the downstream side. Among the objects to be processed, a large-diameter material larger than the sieve mesh is conveyed downstream on the rotating roll and discharged to the outside. On the other hand, a material smaller than the mesh (hereinafter referred to as a small diameter material) is discharged downward through the mesh.

In addition, in the conventional roll screen, in a plurality of rotating rolls arranged side by side, for example, by connecting driving means individually in even rows and odd rows, adjacent rotating rolls are driven to rotate by different driving means. Some are configured to do so. By configuring the conventional roll screen in this way, the rotation directions of the adjacent rotary rolls can be rotated in opposite directions. Thereby, what is called a pinching operation of performing sieving while sandwiching a workpiece with adjacent rotating rolls can be performed. According to the sandwiching operation, the object to be processed can be sandwiched and crushed, so that, for example, even a object to be processed that contains a large amount of a large diameter material or an object to be processed with high viscosity or adhesion can be screened smoothly. And the processing efficiency can be improved.
Japanese Patent Laying-Open No. 2004-305843 (FIG. 1)

However, when the above-described sandwiching operation is performed, if any foreign matter that cannot be crushed between adjacent rotating rolls is caught, all the rotating rolls are stopped. Had to be performed, leading to a reduction in the operating rate of the roll screen.
In addition, if foreign matter is caught between the rotating rolls, power concentrates on the driving means and the biting location, so a large load is applied to the driving means and the rotating roll at the biting location, and the life of the roll screen is shortened. The equipment cost was high.

  The present invention has been made to solve such a problem, and provides a roll screen that efficiently performs a sieving process without lowering the operation rate even for an object to be processed having a high content of foreign matter. This is the issue.

  The present invention created based on such an idea connects a plurality of rotating rolls arranged in parallel at predetermined intervals, a driving means for rotating the rotating rolls, and connecting the driving means and the rotating rolls. It comprises a connecting means and a slip means for slipping the rotating roll on which the torque acts when a torque exceeding a predetermined value is generated on the rotating roll.

  According to this configuration, the roll screen bites foreign matter between adjacent rotary rolls, and when a predetermined torque or more acts on the rotary roll, the rotary roll related to the biting site slips by the slip means. Therefore, the rotating rolls other than the biting location can continue to operate without being stopped. Thereby, while preventing the fall of the operating rate of a roll screen, it can prevent that an overload is applied to an apparatus and can extend the lifetime of an apparatus.

  Further, the present invention includes a control unit that controls the rotational drive of the drive unit, and the control unit rotates the adjacent rotary rolls in opposite directions and the adjacent rotary rolls in the same direction. It is preferable to perform control so as to perform at least one of the discharge operation for rotationally driving.

According to such a configuration, it is possible to perform a sandwiching operation in which sieving is performed while sandwiching a workpiece by rotating adjacent rotating rolls in opposite directions.
On the other hand, by performing a discharge operation in which adjacent rotating rolls are rotated in the same direction, a large-diameter material that does not pass through the sieve can be discharged downstream in the rotation direction while performing sieving.

  Moreover, it is preferable that the said control means controls to perform the reversal operation which reverses the rotational drive of the said rotating roll immediately after the said pinching operation.

  According to such a configuration, when a foreign object is pinched between adjacent rotating rolls due to the sandwiching operation, or when the rotating rolls are about to be pinched, the both rotating rolls are reversed so that the foreign object can be pushed upward. Thereby, it can prevent that a foreign material bites between adjacent rotating rolls.

  Moreover, it is preferable that the control means performs control so that the discharge operation is performed immediately after the reverse operation. According to such a configuration, the sandwiching operation, the reversing operation, and the discharging operation are continuously performed, thereby preventing foreign matter from being caught and preventing foreign matter and large-diameter material from staying on the rotating roll. Dividing efficiency can be increased.

  In addition, it has a current value detecting means for detecting the current value of the driving means, and the control means is configured to perform when the current value becomes a predetermined value or more when the sandwiching operation or the reversing operation is performed. It is preferable to control to perform the discharge operation.

  That is, when the biting occurs during the pinching operation or the reverse operation, the current value increases because an overload acts on the driving means. According to such a configuration, the discharging operation can be performed by detecting a current of a predetermined value or more and rotating the rotating roll in the same direction. Thereby, since the foreign material caught between the adjacent rotating rolls is pushed out above the rotating rolls, the foreign objects can be automatically discharged without stopping the apparatus, and the sieving efficiency can be improved.

  In addition, it has slip detection means for detecting slip of the rotating roll, and the control means performs the discharge operation when the slip of the rotating roll is detected when the sandwiching operation or the reverse operation is performed. Control is preferably performed.

  According to such a configuration, when biting or the like occurs during the pinching operation or the reverse operation and the rotating roll slips by the slip means, the slip operation can be detected and the discharge operation can be performed. Thereby, since the foreign material caught between the adjacent rotating rolls is pushed out above the rotating roll, the foreign objects can be automatically discharged without stopping the apparatus, and the operation efficiency can be improved.

  According to the roll screen according to the present invention, it is possible to efficiently perform a sieving process without lowering the operation rate even for an object to be processed that contains a large amount of a large-diameter material or an object to be processed with high viscosity or adhesion. In addition, it is possible to prevent an overload from acting on the device and to extend the life of the device.

[First embodiment]
Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing a roll screen according to the first embodiment. FIG. 2 is a cross-sectional view taken along line AA showing the roll screen according to the first embodiment. FIG. 3 is an enlarged cross-sectional view showing a configuration of one end side of the rotary roll according to the first embodiment . FIG. 4 is a side view showing a part of the roll screen according to the first embodiment.

As shown in FIGS. 1 and 2, the roll screen 1 according to the first embodiment includes a rotary roll 2 arranged in parallel at a predetermined interval in the longitudinal direction of the roll screen 1 and a drive for driving the rotary roll 2. It mainly includes a means 3, a connecting means 4 for connecting the rotary roll 2 and the driving means 3, and a control means 7 for controlling the driving means 3. Further, the roll screen 1 includes a slip means 5 formed on one end side of the rotary roll 2 and a slip detection means 6 for detecting the slip of the rotary roll 2 as shown in FIG.
In the longitudinal direction of the roll screen 1 shown in FIG. 1, the drive means side is the upstream side, and the other side is the downstream side. In the width direction of the roll screen 1, one end side is the right side and the other end side is the left side.

As shown in FIG. 2, the roll screen 1 further includes a hopper 11 and an inclined guide plate 12 that are formed so that an object to be processed (not shown) is preferably poured into the center of the rotary roll 2. Both the hoppers 11 and 12 inclined guide plates are inclined plates formed along the longitudinal direction of the roll screen 1, and are inclined toward the center side of the rotary roll 2. The hopper 11 is installed on the upper surface of the upper frame 13 that forms the outline of the roll screen 1 and is formed so that the angle can be arbitrarily changed.
In addition, the roll screen 1 is formed so as to be inclined so that the downstream side is lowered so that the object to be processed can easily flow from the upstream side toward the downstream side. In FIG. 1, the hopper 11 and the inclined guide plate 12 are omitted for easy understanding.

  The rotating roll 2 is a member that rotates around an axis and forms a mesh for sieving a workpiece by a gap between adjacent rotating rolls 2. The rotary roll 2 according to the first embodiment includes a roll shaft 2a spanned between a pair of bearing frames 14 and 14 disposed at a predetermined interval in the width direction of the roll screen 1, and a shaft of the roll shaft 2a. It consists of a rotary disk 2b installed at a predetermined interval perpendicular to the direction, and a sprocket portion 2c formed on one end side of the roll shaft 2a.

  In the first embodiment, for example, 20 rotary rolls 2 are arranged side by side at a predetermined interval, and are formed by changing the installation positions of the sprocket portions 2c in odd rows and even rows. That is, a sprocket portion 2c is formed on the right side of the roll screen 1 in the odd-numbered rotary rolls 2 counted from the upstream side, and the sprocket portion 2c is formed on the left side of the roll screen 1 in the even-numbered rotary rolls 2. Is formed. Hereinafter, the odd-numbered rotary rolls 2 are also referred to as first rotary rolls 2m. The even-numbered rotating rolls 2 are also referred to as second rotating rolls 2n.

  As shown in FIGS. 1 and 2, the rotating disk 2b is a plate-like member provided on the cylindrical surface of the columnar roll shaft 2a at a right angle to the roll shaft 2a. Is a plate having an elliptical shape (hereinafter also referred to as an elliptical plate). The rotating disk 2b is attached with adjacent elliptical plates shifted by 90 ° in the axial direction of the roll shaft 2a. Further, the rotating disk 2b is formed to have a zigzag shape as a whole when the roll screen 1 is viewed in plan by adjusting the position of the rotating disk 2b associated with the adjacent roll shaft 2a.

By providing the rotary roll 2 in this way, a sieve mesh is formed by the gap between the adjacent roll shafts 2a and the gap between the rotary disks 2b. The object to be processed (small-diameter material) smaller than the sieve mesh is discharged downward through the sieve mesh, and the object to be processed (large-diameter material) larger than the sieve mesh stays in the upper part of the rotary roll 2.
In addition, what is necessary is just to set suitably the shape, magnitude | size, etc. of a sieve according to the kind of to-be-processed object. Further, in the first embodiment, the rotary disk 2b is an elliptical plate, but is not limited thereto, and may be a square or a circle. The rotating disk 2b may be provided in combination with different shapes.

  As shown in FIGS. 1 and 3, the sprocket portion 2 c imparts rotational driving to the rotary roll 2 via the connecting means 4. The sprocket portion 2c is formed on one end side of the roll shaft 2a. In the first embodiment, the sprocket portion 2c includes two chain wheels 2d and 2d that are formed coaxially with the roll shaft 2a and spaced apart in the width direction. Teeth (not shown) engaged with the connecting means 4 are formed on the outer periphery of the chain wheel 2d.

  In addition, as shown in FIG. 2, you may provide the scraper S formed in the comb-tooth shape between the rotating disks 2b under the rotating roll 2. As shown in FIG. The scraper S can scrape the surface of the rotating disk 2b by contacting the rotating disk 2b, and can remove the workpiece attached to the rotating disk 2b.

As shown in FIG. 1, the driving means 3 serves as a power source for imparting rotational driving to the rotary roll 2. In the first embodiment, the driving means 3 includes a first driving means 3a for driving the first rotating roll 2m and a second driving means 3b for driving the second rotating roll 2n using a known motor. The first driving means 3a and the second driving means 3b are formed so as to appropriately perform forward and reverse rotation based on a signal output from the control means 7.
In the first embodiment, the two driving units 3 are used. However, a single driving unit 3 or three or more driving units 3 may be used. Moreover, you may provide the drive means 3 in each rotary roll 2, respectively.

As shown in FIGS. 1 and 4, the connecting means 4 is a member that transmits the rotational drive of the drive means 3 to the rotary roll 2. In the first embodiment, the connecting means 4 uses a known chain that engages with the teeth of the chain wheel 2d. The connection means 4 connects the adjacent first rotating rolls 2m or the adjacent second rotating rolls 2n. Further, the connecting means 4 connects the first driving means 3a, the most upstream first rotating roll 2m and the second driving means 3b, and the most upstream second rotating roll 2n.
The connecting means 4 is not limited to a chain, and any connecting means 4 may be used as long as it can transmit the rotational drive of the driving means 3 to the rotary roll 2. For example, the connecting means 4 may be a belt or a combination of a shaft and a gear.

  The slip means 5 is a mechanism that causes the rotary roll 2 to slip when a predetermined torque acts on the rotary roll 2. In the first embodiment, the slip means 5 uses a torque keeper (manufactured by Tsubaki Emerson Co., Ltd.), which is a known mechanical slipping clutch. As shown in FIG. 3, the slip means 5 is fitted to one end of the rotary roll 2 and has a hub 22 provided with a projecting portion 21 having a circular cross-sectional view, and a hollow disc fixed to the chain wheel 2d by a bolt 23. -Shaped AF flange 24, a hollow disk-shaped pressing plate 25 that presses the AF flange 24 from the outside, a hollow disk-shaped disc spring 26 that is in contact with the outside of the pressing plate 25, and a pressing of the disc spring 26 And an adjusting bolt 27 for adjusting the pressure. The disc spring 26 has a tapered shape that becomes narrower toward the outside and is formed to be elastically deformed by an external force. The end surfaces of the hub 22 and the rotary roll 2 are joined by bolts 28 to prevent the hub 22 from coming off. Further, a key 29 is provided on the outer periphery on the end side of the rotary roll 2 so as to project in the axial direction so as to engage with a key groove (not shown) formed in the hub 22 so that torque is transmitted. Has been.

During normal operation, the connecting means 4 (not shown) is engaged with the chain wheel 2d, and therefore when the drive is transmitted to the connecting means 4, the chain wheel 2d is centered on the axis of the rotary roll 2. Rotate. At this time, the chain wheel 2d and the AF flange 24 are fixed by the bolt 23, the hub 22 and the rotary roll 2 are engaged by the key 29, and the AF flange 24 further includes the overhanging portion 21,
The rotation drive of the chain wheel 2 d is transmitted to the rotary roll 2 because it is sandwiched with a predetermined pressing force by the pressing plate 25 that rotates together with the hub 22.

However, for example, when a predetermined torque acts on the slip means 5 via the rotary roll 2 due to foreign matter biting in, the AF flange 24 sandwiched between the pressing plate 25 and the overhanging portion 21 slips, The chain wheel 2d is formed to idle.
That is, the AF flange 24 is not directly fixed to the hub 22, but is only sandwiched by the overhanging portion 21 and the pressing plate 25 by the elastic force of the disc spring 26 with a predetermined pressing force. Therefore, when a torque greater than the pressing force by the disc spring 26 acts on the chain wheel 2d (AF flange 24), the AF flange 24 slips between the overhanging portion 21 and the pressing plate 25.

  According to such a slip means 5, for example, even when a foreign object is caught between the adjacent rotary rolls 2 and 2 and a torque of a predetermined level or more is applied, only the rotary rolls 2 and 2 are in the slip means 5. Therefore, the rotary roll 2 related to other than the biting portion can continue to operate without being stopped. As a result, it is possible to prevent the operating rate of the roll screen 1 from being lowered and to prevent the overload from acting on the biting rotary rolls 2 and 2 and the driving means 3, thereby extending the life of the apparatus. It should be noted that the predetermined torque for generating the slip may be adjusted as appropriate depending on how tightly the adjusting bolt 27 is tightened.

  In the first embodiment, a torque keeper, which is a mechanical slipping clutch, is used as the slip means 5, but the present invention is not limited to this. For example, any mechanism that can limit the transmission torque, such as a torque limiter, an electromagnetic clutch, or a fluid coupling, may be used.

  As shown in FIGS. 3 and 4, the slip detection means 6 is a device that detects a slip of the rotary roll 2. The slip detection means 6 uses, for example, a known magnetic proximity switch in the first embodiment. The slip detection means 6 is installed in the vicinity of the chain wheel 2d, detects the rotation of the chain wheel 2d, and sets the state in which the chain wheel 2d is stopped despite the drive means 3 being operated as a slip. It is formed to judge. The slip detection means 6 is configured to output a signal to the control means 7 when the slip of the rotary roll 2 is detected. The slip detection means 6 is not limited to a magnetic proximity switch, and other detection mechanisms may be used.

As shown in FIGS. 1 and 3, the control means 7 is electrically connected to the slip detection means 6 and the drive means 3 and controls the operation of the drive means 3 based on each signal.
The control means 7 includes an operation panel (not shown), and is configured to be able to execute power on / off, a pinching operation, a reverse operation, a discharge operation, and an automatic operation described later by operation buttons. In the first embodiment, the control means 7 is configured to receive a signal from the slip detection means 6 and perform a discharge operation described later. Further, the control means 7 includes a storage means (not shown), and an automatic operation program for automatically performing the pinching operation, the reverse operation, and the discharge operation is stored in the storage means.
That is, in the first embodiment, the control means 7 rotates by appropriately rotating the first drive means 3a and the second drive means 3b forward and backward based on the operation signal and the output signal from the slip detection means 6. The rotational drive of the roll 2 is controlled.

  Here, the sandwiching operation, the reversing operation, and the discharging operation of the rotating roll 2 will be described with reference to FIG. FIG. 5 is a schematic cross-sectional view of the rotary roll according to the first embodiment as viewed from the right side surface, in which a) shows a pinching operation, b) a reverse operation, and c) a discharge operation. In FIG. 5, a sieve P is formed between the first rotary roll 2m and the second rotary roll 2n, and a sieve Q is provided between the second rotary roll 2n and the first rotary roll 2m ′. It is formed, and the sieve mesh R is formed between the first rotating roll 2m ′ and the second rotating roll 2n ′. Further, among the rotating rolls 2, the clockwise rotation is the forward rotation and the counterclockwise rotation is the reverse rotation. Further, the rotating disk 2b is omitted for ease of explanation.

  As shown in FIG. 5 (a), the sandwiching operation is performed by rotating one of the first rotating roll 2m or the second rotating roll 2n in the normal direction and rotating the other in the reverse direction so that the adjacent rotating rolls 2 are in the opposite direction. It will rotate. In the sandwiching operation, in the first embodiment, the first rotary rolls 2m and 2m 'are rotated forward and the second rotary rolls 2n and 2n' are rotated in the reverse direction.

  According to the pinching operation, a downward rotation acts on the meshes P and R, and the object to be treated can be sandwiched and crushed by the meshes P and R. For example, a large-diameter material having high viscosity and adhesion Even so, sieving can be performed smoothly and the processing efficiency can be increased.

  In the reversal operation, as shown in FIG. 5B, immediately after the sandwiching operation, the rotational driving of the first rotary roll 2m and the second rotary roll 2n is reversed reversely. That is, according to the first embodiment, the first rotary rolls 2m and 2m 'are rotationally driven in the reverse direction and the second rotary rolls 2n and 2n' are rotated in the forward direction.

  According to the reversal operation, upward rotation is applied to the sieve meshes P and R, and therefore, foreign matters or the like that have been caught in the sieve meshes P and R by the sandwiching operation can be pushed up above the rotary roll 2. Moreover, since downward rotation acts on the sieve mesh Q, the object to be processed can be sandwiched between the sieve mesh Q and crushed.

In the discharging operation, as shown in FIG. 5C, the first rotating rolls 2m and 2m ′ and the second rotating rolls 2n and 2n ′ are rotated in the same direction. In the first embodiment, all the rotating rolls 2 are rotated in the forward direction.
According to the discharge operation, a large-diameter material that does not pass through the sieve can be conveyed toward the downstream side while sieving the workpiece, and the large-diameter material can be discharged to the outside of the roll screen 1. it can.

  That is, by repeating the pinching operation and the reversing operation, foreign matter can be prevented from being caught in the sieve meshes P, Q, and R, and the sieving can be performed while stirring the object to be processed. Can be increased. Further, by performing the discharge operation immediately after the reverse operation, the large-diameter material can be efficiently discharged to the outside.

Further, by storing a program for appropriately performing the sandwiching operation, the reversing operation, and the discharging operation in a storage unit (not shown), it is possible to perform an automatic operation by combining these operations.
For example, the rotation speeds of the sandwiching operation, the reversal operation, and the discharge operation may be set in advance, and when a predetermined number of rotations have been completed, the operation may be sequentially switched to the next operation. Further, when slip is detected by the slip detection means during the pinching operation or the reverse operation, the discharging operation may be performed, and the pinching operation may be performed again after completing a predetermined number of rotations. .
In addition, you may comprise so that switching of operation may be switched by time instead of rotation speed.

Next, the operation of the roll screen 1 will be described.
First, the operator drives the roll screen 1 with an operation button on an operation panel (not shown). Then, the object to be processed flows along the hopper 11 from above the upstream side of the roll screen 1.
When the roll screen 1 performs a sandwiching operation or a reversing operation, if a foreign matter mixed in the object to be processed is caught between the adjacent rotating rolls 2 and 2, A predetermined torque acts. When the torque exceeds a preset torque value, the rotating rolls 2 and 2 in which foreign matter is caught slip by the slip means 5, and a signal is output from the slip detection means 6 to the control means 7. Then, the control means 7 controls the drive means 3 to perform the discharging operation based on the signal from the slip detection means 6.

According to the roll screen 1 as described above, even if a biting or the like occurs during the pinching operation or the reverse operation, the slip of the rotary roll 2 is detected by the slip means 5 and the slip detection means 6. The discharge operation can be performed.
Accordingly, the bitten foreign matter is pushed out above the rotary roll 2 and conveyed toward the downstream side, so that the foreign matter can be automatically discharged to the outside and the operating efficiency can be improved.

  Further, by appropriately combining the sandwiching operation, the reversing operation, and the discharging operation, it is possible to prevent biting and stir the object to be processed, thereby preventing the large-diameter material from staying on the upper part of the rotary roll 2. Large-diameter material can be discharged to the outside. Thereby, the efficiency of sieving can be increased.

  Further, even when foreign matter is caught between the adjacent rotating rolls 2 and 2, slipping is caused by the slip means 5, so that an overload is prevented from acting on the rotating rolls 2 and 2 and the driving means 3. Therefore, the life of the apparatus can be extended.

[Second Embodiment]
The roll screen according to the second embodiment is different from the roll screen 1 according to the first embodiment in that a current detection unit is provided instead of the slip detection unit 6.
Although not specifically shown, the roll screen according to the second embodiment is characterized in that the drive means has a current value detection means for detecting a current value. That is, when the rotating roll slips by the slip means, the current value of the drive means increases. The current detection means is configured to transmit a signal to the control means when the current value rises to a predetermined value set in advance. The control means is configured to receive the output signal from the current value detection means and perform the discharge operation.
Thereby, since slip of a rotation roll is detected and discharge operation can be performed automatically, sieving efficiency can be improved. The current detection means may be a known current detection device.

  In the first embodiment and the second embodiment, the present invention is configured as described above. However, the present invention is not limited to this, and can be appropriately changed without departing from the gist of the present invention. For example, even when a foreign object is caught during the discharging operation, the operation may be switched to another operation using a slip of the rotary roll as a trigger.

Next, an example of the roll screen 1 will be described.
As the roll screen 1, an apparatus having a sieve area of 1200 × 2900 mm was used. The outer diameter of the rotary roll 2 was 101.6 mm, the rotational speed was 24 rpm, and the interval between the rotary rolls 2 and 2 was 50 mm. As the driving means 3, two electric motors with a cyclo reducer (3.7 Kw, reduction ratio: 1/51, output torque 978 Nm) were used. The slip torque of the slip means 5 was set to 325 Nm. As the slip means 5 (torque keeper), a torque keeper TFK70-2 (manufactured by Tsubaki Emerson) was used.

According to such a roll screen 1, since the slip means 5 is provided, it is possible to perform a sieving process more efficiently than a conventional roll screen even for a viscous / adhesive object to be processed that contains a large amount of foreign matter. became. In other words, according to the roll screen 1 according to the present invention, the conventional type has a high biting frequency and can only secure a passing ability of about 5 to 10 t / h. Processing became possible.
In addition, when the slip torque was set to 150 Nm or less, the rotating roll 2 slips easily, and there was a tendency that the caught foreign matter could not be discharged smoothly. Further, if the slip torque is set to 1000 Nm or more, it is considered that the stress acting on the device during biting is too large, leading to a shortened life of the device. Therefore, the slip torque is preferably set in a range larger than 150 Nm and smaller than 1000 Nm.

It is the top view which showed the roll screen which concerns on 1st embodiment. It is the sectional view on the AA line which showed the roll screen which concerns on 1st embodiment. It is the expanded sectional view which showed the structure of the one end side of the rotary roll which concerns on 1st embodiment . It is the side view which showed a part of roll screen which concerns on 1st embodiment. It is the schematic cross section which looked at the rotary roll which concerns on 1st embodiment from the right side surface, Comprising: a) is pinching operation, b) is reversal operation, c) shows discharge operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roll screen 2 Rotating roll 2m 1st rotating roll 2n 2nd rotating roll 3 Drive means 4 Connection means 5 Slip means 6 Slip detection means 7 Control means

Claims (6)

A plurality of rotating rolls arranged in parallel at a predetermined interval; a driving means for rotating the rotating roll; and a connecting means for connecting the driving means and the rotating roll;
To each of the rotating roll, when a predetermined or more torque is generated, includes a slip hand stage to slip the rotating roll according torque is acting,
A roll screen characterized in that when a foreign object is caught, a rotating roll related to a part other than the part where the foreign object is caught is continuously operated . Control means for controlling the rotational drive of the drive means;
The control means includes
The control is performed so as to perform at least one of a sandwiching operation in which the adjacent rotating rolls are rotationally driven in opposite directions and a discharging operation in which the adjacent rotating rolls are rotationally driven in the same direction. Roll screen as described. The control means includes
3. The roll screen according to claim 2, wherein the roll screen is controlled to perform a reversal operation for reversing the rotational drive of the rotary roll immediately after the sandwiching operation. The control means includes
The roll screen according to claim 3, wherein the discharge operation is controlled immediately after the reverse operation. Current value detecting means for detecting the current value of the driving means;
The said control means is controlled to perform the said discharge operation, when the said electric current value becomes more than predetermined value, when performing the said pinching operation or the said reverse operation. Roll screen as described. Comprising slip detecting means for detecting slip of the rotating roll;
4. The roll screen according to claim 3, wherein when the sandwiching operation or the reversal operation is performed, the control unit performs control so that the discharge operation is performed when a slip of the rotating roll is detected. .

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