KR102367704B1 - Grinding device for back-surface and metal plate grinding system using it - Google Patents

Abstract

The present invention relates to a rear surface polishing device and a metal plate polishing system using the same, which polish a rear surface of an object to be polished while transferring the object to be polished at a constant speed, simultaneously lift both ends of a billy roll pressing the object to be polished or manually lift one end thereof to polish the rear surface of the object to be polished after adjusting an arrangement angle of the billy roll in response to a surface condition of the object to be polished, and lower the height of a frame where an abrasive belt is installed, such that installation of a pit groove on a bottom surface is not necessary, and utilization can increase. The rear surface polishing device of the present invention comprises: a billy roll disposed on an upper side of a frame, and pressing an upper surface of an object to be polished which is being transferred; a rear surface polishing member disposed on a lower side of the frame, and polishing a rear surface of the object to be polished which is being transferred by using an abrasive belt rotated in a triangular shape; and a billy roll adjustment unit for adjusting the height and an installation angle of the billy roll. The billy roll adjustment unit includes: a billy roll lifting adjustment unit connected to any one of billy roll supports of both sides for rotatably supporting the billy roll, and simultaneously lifting the billy roll supports of both sides; a billy roll angle adjustment unit connected to the other one of the billy roll supports of both sides, and lifting the same; and a linkage shaft for connecting the billy roll lifting adjustment unit and the billy roll angle adjustment unit, and having a clutch in the middle.

Description

BACK-SURFACE AND METAL PLATE GRINDING SYSTEM USING IT}

The present invention relates to a back polishing machine and a polishing system using the same, and more particularly, to a rear surface of a polishing object while transporting the polishing object at a constant speed, while simultaneously raising and lowering both ends of a billy roll that presses the polishing object, or one end After adjusting the arrangement angle of the billy roll in response to the surface condition of the object to be polished by manually raising and lowering it, the back side of the object can be polished. It relates to a back polishing machine capable of increasing the utility and a metal plate polishing system using the same.

In general, a metal plate is shipped in a wound state in a rectangular plate or roll shape, and the surface is polished before use to remove surface defects and at the same time undergo a grinding operation to impart surface roughness and gloss.

To this end, a plurality of polishing cabins are installed on the polishing line of the metal plate, and the surface of the metal plate is directly polished by contacting the polishing belt rotating at high speed inside each polishing cabin. At this time, the billy roll is rotatably disposed on the top of the metal plate so that the metal plate is in contact with the abrasive belt with an appropriate pressure.

In this regard, most of the polishing lines are equipped with a top surface grinder that polishes only the top surface of the metal plate, and in order to polish the back of the metal plate, the metal plate is turned over and polished again with the top surface grinder, and for this reason, the metal plate is polished again. There is a problem in that the time required to polish both sides of the surface increases. Of course, a method of reversing the top surface grinding machine to configure the rear surface grinding machine and continuously arranging the top surface grinder and the rear surface grinder to grind the upper surface and the rear surface of the metal plate, respectively, is also being studied.

However, in the upper surface grinding machine, the contact roller and tension roller for rotating the abrasive belt are arranged vertically on the frame, so that the frame has a long vertical length. This causes a problem of having to form a pit groove for installing the rear polishing machine on the floor.

Moreover, it is necessary to adjust the height of both ends of the billy roll that presses the metal plate according to the surface condition of the metal plate and the degree of polishing. There is also the problem of low precision.

On the other hand, in Korean Patent Laid-Open No. 10-2013-0046579, a connection frame installed on the upper side of a roller table for transporting a material, a central axis connected to the connection frame, and a plurality of grinders disposed along the transport direction of the material, are connected A material surface polishing apparatus capable of polishing the surface of a material being transferred in multiple stages, including a height adjustment apparatus for forming a height difference between a plurality of polishing periods by adjusting the height and inclination of the frame, is proposed and disclosed,

Patent Registration No. 10-1712323 discloses an abrasive wheel that is spaced apart from the upper part of the horizontally transported metal plate, and is provided with an abrasive member formed of abrasives or diamonds for surface processing of the metal plate on a lower surface facing the surface of the metal plate; an actuator connected to the central upper side of the abrasive wheel, a pulley mounted thereon to receive a rotating shaft receiving rotational force transmitted by a motor, and rotationally driving the abrasive wheel by the rotational force of the rotating shaft; a pair of cylinders fixed to both sides of the actuator and having a cylinder shaft for elevating and lowering the polishing wheel; an elevating plate that is connected and fixed to the ends of both cylinder shafts in a horizontal state and stably transmits the elevating force of both cylinder shafts to the grinding wheel; and cooling means for cooling the metal plate surface-polished by the polishing wheel, and is arranged in a plurality corresponding to the width of the metal plate so that the entire width of the metal plate can be simultaneously polished, so that the width of the metal plate to be surface-processed It is possible to grind the whole thing at once, which can reduce the processing time, and it is possible to precisely control the height of the abrasive member for processing the surface of the metal plate. proposed and disclosed,

Patent Registration No. 10-2122556 discloses a conveyor for transferring steel plates; and a grinding means that is rotatably coupled to an upper portion of the conveyor in a direction perpendicular to the conveyor, grinds the surface of the steel plate, and adjusts the grinding angle of the steel plate according to the rotation. With this configuration, a polishing means is rotatably coupled to a conveyor, and thus a steel plate surface polishing apparatus capable of polishing various patterns on the steel sheet surface by adjusting a polishing angle through rotation of the polishing means has been proposed and disclosed.

Laid-Open Patent Publication No. 10-2013-0046579 Registered Patent Publication No. 10-1712323 Registered Patent No. 10-2122556

The present invention has been devised in view of solving the above-mentioned problems, and grinding the rear surface of the abrasive object while transferring the abrasive object at a constant speed. After adjusting the arrangement angle of the billy roll in response to the surface condition of the object to be polished by lifting it to the pole, the rear surface of the object can be polished. An object of the present invention is to provide a back polishing machine capable of increasing the surface quality and a metal plate polishing system using the same.

The rear polishing machine of the present invention for achieving the above object, the billy roll disposed on the upper side of the frame to press the upper surface of the polishing object being transported; a rear polishing member disposed on the lower side of the frame and polishing the rear surface of the object being transported using an abrasive belt rotating in a triangular shape; Includes; biliroll adjustment unit for adjusting the height and installation angle of the biliroll;

The biliroll adjusting unit is connected to either one of the biliroll supports that rotatably supports the biliroll and the bilirol elevating unit is connected to the other of the biliroll supports to raise and lower the biliroll at the same time. It is characterized in that it includes an interlocking shaft with a clutch in the middle, connecting the roll angle adjusting unit, the biliroll lifting/lowering adjusting unit, and the bilirolling angle adjusting unit.

Here, the billy roll lifting control unit includes a servo motor for lifting and lowering, a worm screw jack installed on the frame and connected to the billy roll support to raise and lower the billy roll support, and the servo motor and the worm screw jack are disposed between the servo motor and the servo motor. It decelerates the rotational force of the motor, transmits it to the worm screw jack, and includes a worm reduction unit connected to the interlocking shaft. , is rotatably installed on the frame to rotate the worm screw jack and may include a handle to which the rotating shaft is connected to the clutch.

Here, the rear abrasive member includes an abrasive belt for grinding the rear surface of the abrasive object, a contact troll that is rotatably installed on the frame to contact the billy roll through the abrasive object and rotates the abrasive belt, and a contact to support the abrasive belt A preroll rotatably installed on the frame from the lower side of the roll, and a tension roll that is horizontally moved by a tension cylinder installed on the frame from the lower side of the contact roll to give tension to the abrasive belt, the contact roll and the preroll And the tension roll may be arranged in a triangular shape.

Here, it further includes two pairs of pinch rolls disposed above and below the abrasive object to transport the abrasive object and rotatably installed on the frame, and the pinch rolls may be disposed in front and rear of the billy roll, respectively.

And the metal plate polishing system according to the present invention comprises a top surface polishing machine disposed in front or behind the rear polishing machine, and the top polishing machine is disposed below the frame to press the bottom surface of the polishing object being transported; , an upper surface abrasive member disposed on the upper side of the frame and grinding the upper surface of the abrasive object being transported using an abrasive belt, and both ends of the billy roll by being connected to both side billy roll supports that rotatably support the billy roll It may include a pair of biliroll lifting units for lifting and lowering.

Here, the upper surface abrasive member includes an abrasive belt for grinding the upper surface of the abrasive object, a contact troll that is rotatably installed on the frame to contact the billy roll through the abrasive object and rotates the abrasive belt, and elastically supports the abrasive belt It may include a tension roll disposed on the upper portion of the contact roll and vertically moved by a tension cylinder to impart tension to the abrasive belt.

The back grinder according to the present invention adjusts the height of the biliroll through the bili-roll elevation control unit and adjusts the angle of the bili-roll through the bili-roll angle control unit to evenly grind the back surface of the welding object regardless of the surface condition of the welding object. As the abrasive belt is arranged in a triangular shape, the height of the frame is lowered, so that it is possible to achieve a useful effect that can be installed by utilizing the lower space of the abrasive object without forming a separate pit groove on the base surface.

According to the present invention, the billy roll is automatically raised and lowered through the billy roll lifting and lowering control unit composed of a servo motor, a worm reduction unit, and a worm screw jack, while simultaneously raising and lowering both ends of the billy roll using an interlocking shaft to pressurize the abrasive object. After releasing the connection of the interlocking shaft through the clutch, the angle of the billy roll is adjusted to correspond to the surface condition of the object to be polished through the angle adjustment unit of the billy roll made of the handle and the worm screw jack to correspond to the surface condition of the object to be polished A useful effect that can be achieved can be achieved.

According to the present invention, the height of the frame can be lowered by disposing the contact roll, the preroll, and the tension roll in a triangular shape, as well as a useful effect of maintaining the tension of the abrasive belt constant by moving the tension roll back and forth using a tension cylinder can be achieved

According to the present invention, it is possible to achieve a useful effect of stably guiding an abrasive object being transported using pinch rolls disposed in pairs at the front and rear of the billy roll, respectively.

In addition, the metal plate polishing system of the present invention can polish the rear surface of the object to be polished by using the rear surface grinder and also use the upper surface grinder disposed in the front or rear of the rear surface grinder to polish the upper surface of the object to increase productivity. Greatly improved useful effects can be achieved.

According to the present invention, it is possible to achieve a useful effect of reducing the space occupied by the upper surface polishing machine as the contact roll and the tension roll of the upper surface polishing member for polishing the upper surface of the object to be polished are arranged in the vertical direction.

1 is a perspective view showing a back polishing machine according to the present invention.
2 is a front view of the rear polishing machine according to the present invention.
3 is a right side view of the rear polishing machine according to the present invention.
Figure 4 is a perspective view showing the polishing part of the back polishing machine according to the present invention.
5 is a view for explaining a state of adjusting the tension of abrasive paper in the back polishing machine according to the present invention.
6 is a view showing a state in which the entire billy roll is raised and lowered through the automatic lifting unit of the billy roll in the rear grinding machine according to the present invention.
7 is a reference view showing a state in which the position of the end of the biliroll is finely adjusted by using the manual lifting unit of the biliroll in the rear grinding machine according to the present invention.
8 is a block diagram showing a flat plate polishing system including a back polishing machine according to the present invention.
9 is a block diagram showing the top surface polishing machine of the flat plate polishing system according to the present invention.
10 is a view showing a driving unit of the upper surface polishing machine of the flat plate polishing system according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The terms used in the present invention are terms defined in consideration of the functions in the present invention, which may vary depending on the intention or custom of the user or operator, so the definitions of these terms correspond to the technical matters of the present invention and should be interpreted as a concept.

1 to 7 of the accompanying drawings are diagrams shown to explain a back polishing machine according to an embodiment of the present invention, and FIGS. 8 to 10 are diagrams shown to explain a plate material polishing system according to an embodiment of the present invention.

As shown in Figs. 1 to 8, the rear polishing machine according to the present invention includes a biliroll 10, a rear polishing member 20, a biliroll lifting control unit 30, and a biliroll angle adjusting unit 30'). and a billy roll adjustment unit composed of an interlocking shaft 35 and a frame 50 in which they are installed.

The billy roll 10 is disposed on the upper side of the frame 50 to press the upper surface of the abrasive object 100 being transported. there is.

The rear abrasive member 20 is disposed on the lower side of the frame 50 to polish the rear surface of the object 100 being transported using the abrasive belt 25 rotating in a triangular shape. Specifically, as shown in FIGS. 2 and 4 , the rear polishing member 20 includes an abrasive belt 25 for polishing the rear surface of the object 100 and a billy roll 10 with the object 100 interposed therebetween. ) is rotatably installed on the frame 50 and rotates the abrasive belt 25, and the frame 50 from the lower side of the contact troll 21 to support the abrasive belt 25 The tension is applied to the abrasive belt 25 by being moved horizontally by the preroll 22 rotatably installed in the and a roll 23 .

That is, the contact roll 21, the preroll 22, and the tension roll 23 constituting the rear polishing member 20 are arranged in a triangular shape, which lowers the height of the frame 50 to form a separate pit groove. It is for polishing the rear surface of the object 100 to be polished by using the lower space of the object 100 to be polished.

The biliroll adjustment unit is connected to any one of the biliroll supports on both sides that rotatably supports the biliroll 10, and the biliroll elevation control unit 30 simultaneously raises and lowers both the biliroll supports, and the other of the biliroll supports. An interlocking shaft 35 having a clutch 36 in the middle connecting the biliroll angle adjusting unit 30 ′ connected to and elevating the biliroll lifting adjusting unit 30 and the biliroll angle adjusting unit 30 ′. ) is included.

Accordingly, when the height of the billy roll 10 is adjusted in order to control the degree of polishing of the object 100 to be polished, as shown in FIG. 6 , the interlocking shaft 35 is connected by the clutch 36 . At the same time, both ends of the biliroll 10 are raised and lowered through the biliroll elevation adjustment unit 30 in the biliroll.

And when the angle of the biliroll 10 is adjusted according to the surface condition of the object 100 to be polished, as shown in FIG. 7 , the connection of the interlocking shaft 35 is released using the clutch 36 and the angle of the biliroll One end of the billy roll 10 is raised and lowered through the control unit 30 ′.

Specifically, as shown in FIG. 4 , the biliroll lifting control unit 30 is installed on the frame 50 and the servomotor 31 for lifting and lowering, and the lower end is connected to the biliroll support to set the biliroll support. It is disposed between the worm screw jack 32 for lifting and lowering, and the servo motor 31 and the worm screw jack 32 to reduce the rotational force of the servo motor 31 and transmit it to the worm screw jack 32, and the interlocking shaft 35 It includes a worm reduction part 33 connected to.

And the billy roll angle adjusting unit 30' is installed on the frame 50 and the lower end is connected to the billy roll support to raise and lower the billy roll support, and the worm screw jack 32 is rotatably installed on the frame 50. It rotates the worm screw jack (32) and the rotating shaft includes a handle (34) connected to the clutch (36).

Accordingly, the rotational force of the servomotor 31 is decelerated by the worm decelerating unit 33 and transmitted to the worm screw jack 32 of the billy roll elevating adjustment unit 30, and at the same time as the clutch 36 to the interlocking shaft 35. It is transmitted to the rotating shaft of the connected handle 34 and transmitted to the worm screw jack 32 of the billy roll angle adjusting unit 30', and the worm screw jack 32 rotates in the forward or reverse direction to elevate the billy roll support. .

And when the handle is rotated in a state in which the connection of the interlocking shaft 35 is released through the clutch 36, only the worm screw jack 32 of the billy roll angle adjusting unit 30' rotates and only the billy roll support connected thereto is rotated. The angle of the billy roll 10 is changed by elevating it.

The frame 50 is provided with a billy roll 10, a rear abrasive member 20, and a billy roll adjustment unit, and pinch rolls disposed above and below the abrasive object 100 to guide the movement of the abrasive object 100 ( 55) is included.

The pinch roll 55 is rotatably installed on the frame 50, and is arranged in pairs at the front and rear of the billy roll 10 to guide the movement of the abrasive object 100 interposed therebetween. .

At this time, it is preferable that the transfer speed of the abrasive object 100 is lower than the rotation speed of the abrasive belt 25 by the contact troll 21 so that the rear surface of the abrasive object 100 is sufficiently polished.

Accordingly, the polishing of the rear surface of the object being transported using the rear polishing machine according to the present invention having the above-described configuration will be described as follows.

In the process of passing between the billy roll 10 and the rear polishing member 20, the polishing object 100 transferred through the pinch roll 55 of the frame 50 is passed through the polishing belt 25 of the rear polishing member 20. ) and then discharged through the pinch roll 55.

At this time, in order to keep the abrasive belt 25 in sufficient tension, the tension cylinder 23 ′ pushes the tension roll 23 outward as shown in FIG. 5 .

Therefore, while the abrasive belt 25 is rotated and moved in such a way that it passes through the contact troll 21, the pre-roll 22, the tension roll 23 and the contact troll 21 while maintaining the tension without sagging, the contact troll ( 21) and the back surface of the abrasive object 100 positioned between the billy roll 10 is polished, thereby improving the polishing quality of the rear surface of the polishing object 100 .

At this time, when the surface quality of the polishing object 100 is uniform and only the adjustment of the polishing amount is required, as shown in FIG. By operating the lifting unit 30, the entire billy roll is raised or lowered at the same time.

Accordingly, the pressure at which the billy roll 10 presses the abrasive object 100 is changed, and thus the polishing thickness of the abrasive object 100 by the rear abrasive unit 20 is changed.

However, if the surface quality of the polishing object 100 is not uniform and the left and right heights of the billy roll 10 need to be adjusted differently, as shown in FIG. 7 , the interlocking shaft 35 is connected through the clutch 36 . release and rotate the handle 34 of the bili-roll angle adjusting unit 30' to elevate one side of the bili-roll support, so that the bili-roll 10 is inclined to the left and right.

Accordingly, the rear surface of the abrasive object 100 is polished in a state in which different pressing forces are applied to the left and right of the upper surface of the abrasive object 100 .

Therefore, it is possible to uniformly grind the rear surface of the object 100 regardless of the surface condition of the object 100, and the billy roll support part is independent by using the servo motor 31 in the billy roll lifting unit 30. It is possible to smoothly adjust the arrangement angle of the billy roll 10 according to the elevation.

On the other hand, the metal plate polishing system according to the present invention, as shown in Figs. 9 to 10, in addition to the above-mentioned back polishing machine (A), the top surface polishing machine (B) disposed in front or rear of the back polishing machine (A) It includes is done by

As shown in FIG. 9 , the upper surface polisher B is disposed on the lower side of the frame 90 and is disposed on the upper side of the billy roll 60 and the frame 90 to press the bottom surface of the abrasive object 100 being transported. The billy roll is connected to the upper surface abrasive member 70 for grinding the upper surface of the object 100 being transported using the abrasive belt 75 and the billy roll supporters on both sides to rotatably support the billy roll 60. A pair of billy roll lifting units 80 for independently raising and lowering both ends of the (60) are made.

In this case, the billy roll lifting unit 80 may be configured in an automatic method using a servo motor and a worm screw jack, or may be configured in a manual method using a handle and a worm screw jack.

And as shown in FIGS. 9 and 10, the upper surface abrasive member 70 includes an abrasive belt 75 for grinding the upper surface of the abrasive object 100 being transported, and a billy roll 60 through the abrasive object 100 interposed therebetween. ) is rotatably installed on the frame 90 to contact the contact troll 71 for rotating the abrasive belt 75, and a tension cylinder disposed on the contact troll 71 to elastically support the abrasive belt 75 A tension roll 72 that is vertically moved by 73 to apply tension to the abrasive belt 75, and a drive motor connected to the contact troll 71 by a transmission member 76 to rotate the contact troll 71 ( 77) may be included.

Accordingly, while maintaining the tension of the abrasive belt 75 using the tension roll 72 vertically moved by the tension cylinder 73, the billy roll using the abrasive belt 75 moved by the contact roll 71 is used. It becomes possible to grind the upper surface of the object 100 to be polished pressed by (71).

Accordingly, the grinding of the grinding object being transported using the plate material grinding system according to the present invention having the above-described configuration will be described as follows.

The upper surface of the abrasive object 100 is polished by transferring the abrasive object 100 in the shape of a square plate or roll using a transfer means, and allowing the abrasive object 100 to pass through the upper surface grinding machine B, and continue Thus, the back surface, that is, the bottom surface of the polishing object 100 is polished by allowing the polishing object 100 to pass through the rear polishing machine (A).

Of course, the rear surface of the polishing object 100 may be first polished and then the upper surface may be polished by arranging the rear polishing machine (A) in the front of the conveying direction and placing the upper polishing machine (B) in the rear of the conveying direction.

The embodiments described above are merely illustrative of preferred embodiments of the present invention and are not limited to these embodiments, and various modifications and variations by those skilled in the art within the technical spirit and claims of the present invention It will be said that it can be made, and it will be said that it falls within the technical scope of the present invention.

A : Back grinding machine B : Top grinding machine
10: billy roll 20: back polishing part
21: contact control 22: free roll
23: tension roll 23': tension cylinder
25: abrasive paper 30: billy roll lifting control unit
30': Billy roll angle adjustment unit 31: Servo motor
32: worm screw jack 33: worm reduction part
34: handle 35: peristaltic shaft
36: clutch 50: frame
55: pinch roll 60: billy roll
70: upper surface abrasive part 71: contact control
72: tension roll 73: tension cylinder
75: abrasive paper 76: drive motor
77: electric member 80: billy roll elevating part
90: frame 95: pinch roll
100: abrasive object

Claims (6)

Billy roll disposed on the upper side of the frame to press the upper surface of the abrasive object being transported;
a rear polishing member disposed on the lower side of the frame and polishing the rear surface of the object being transported using an abrasive belt rotating in a triangular shape; and
Includes; biliroll adjustment unit for adjusting the height and installation angle of the biliroll
The biliroll adjusting unit is connected to either one of the biliroll supports that rotatably supports the biliroll and the biliroll elevating unit is connected to the other of the biliroll supports to raise and lower the biliroll at the same time. By including an interlocking shaft with a clutch in the middle, connecting the roll angle adjusting unit, the biliroll lifting/lowering adjusting unit, and the billy roll angle adjusting unit,
When adjusting the height of the billy roll to control the polishing degree of the object to be polished, the both ends of the billy roll are simultaneously raised and lowered through the billy roll lifting adjustment unit in a state where the interlocking shaft is connected by a clutch,
When adjusting the angle of the billy roll according to the surface condition of the object to be polished, disconnect the interlocking shaft using a clutch and lift one end of the billy roll up and down through the angle adjusting unit,
The billy roll lifting control unit includes a servo motor for lifting and lowering, a worm screw jack installed on the frame and connected to the billy roll support to raise and lower the billy roll support, and the servo motor and the worm screw jack are arranged between the servo motor and the rotation force of the servo motor. It decelerates and transmits it to the worm screw jack and includes a worm reduction part connected to the interlocking shaft,
The billy roll angle adjusting unit is installed in the frame and the lower end is connected to the billy roll support to raise and lower the billy roll support. while containing a handle attached to
The rear abrasive member includes an abrasive belt for grinding the rear surface of the object, a contact troll that is rotatably installed on the frame to contact the billy roll through the object to rotate the abrasive belt, and a lower portion of the contact troll to support the abrasive belt A preroll rotatably installed on the frame from the side, and a tension roll that is horizontally moved by a tension cylinder installed on the frame from the lower side of the contact roll to impart tension to the abrasive belt,
A back grinding machine, characterized in that the contact roll, the pre-roll, and the tension roll are arranged in a triangular shape.
The method according to claim 1,
The rear grinding machine, characterized in that it further comprises two pairs of pinch rolls disposed above and below the abrasive object to transport the abrasive object and rotatably installed on the frame, wherein the pinch rolls are respectively arranged in front and rear of the billy roll.
The back polishing machine according to claim 1;
An upper surface polishing machine disposed in front or rear of the rear surface polishing machine to polish the upper surface of the object to be polished;
The top grinding machine comprises a billy roll disposed on the lower side of the frame to press the bottom surface of the abrasive object being transported, an upper surface grinding member disposed on the upper side of the frame for grinding the top surface of the abrasive object being transported using an abrasive belt, and the billy roll A metal plate polishing system comprising: a pair of billy roll lifting units that are respectively connected to both side billy roll supports that are rotatably supported to independently elevate both ends of the billy roll.
4. The method according to claim 3,
The upper surface abrasive member includes an abrasive belt for grinding the upper surface of the object to be polished, a contact troll that is rotatably installed on the frame to contact the billy roll with the object interposed therebetween, and rotates the abrasive belt, and the contact troll to elastically support the abrasive belt. A metal plate polishing system comprising a tension roll disposed on the upper portion and vertically moved by a tension cylinder to impart tension to the polishing belt. delete delete

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