JPH0453889Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a belt-like grinding device for grinding a belt-like material such as rubber, plastic, leather, wood, etc. to a predetermined thickness.

(Prior art) As a grinding device for precision grinding belts made of rubber, plastic, leather, or wood strips to a predetermined thickness, a conventional grinding device uses sandpaper glued to the outer circumferential surface of a cylindrical drum. A grinder is used to grind one side of the strip by pressing sandpaper against the strip and rotating a drum.

In such grinding equipment, the sandpaper is subject to severe wear, and when working with long or wide strips,
Grinding efficiency decreases due to sandpaper wear,
It is difficult to uniformly grind to a predetermined thickness.
In addition, in order to grind the strip to a predetermined thickness,
It takes a long time. Furthermore, grinding debris from the strip may adhere to the sandpaper, causing the sandpaper to become clogged. If the sandpaper becomes clogged, the grinding efficiency decreases locally, and the strip cannot be uniformly ground to the desired thickness.
Lines and the like are formed on the surface of the strip due to uneven grinding.

(Problems to be solved by the invention) The present invention solves the above-mentioned conventional problems, and its purpose is to provide a grinding device that can stably grind a strip with high precision over a long period of time. It's about doing. Another object of the present invention is to provide a grinding device that can grind a strip to a uniform thickness without the risk of forming streaks or the like due to uneven grinding on the surface of the strip.

(Means for solving the problem) The grinding device of the present invention has diamond abrasive grains adhered to the outer circumferential surface of a protrusion formed in a spiral shape on the outer circumferential surface, and is rotatable and swingable in the axial direction. A cylindrical grinding drum provided, a means for rotating the grinding drum, a means for swinging the grinding drum in the axial direction, and the grinding drum are arranged facing each other with a predetermined distance therebetween. , a pinch roller that presses the strip against the grinding drum so that one side of the strip can come into rolling contact with the outer peripheral surface of the protrusion of the grinding drum, and means for moving the pinch roller to adjust and change the distance. The above object is thereby achieved.

(Example) The present invention will be described below with reference to examples.

As shown in FIG. 1, the grinding device of the present invention includes a grinding drum 20 that contacts the surface of a strip 10 to be ground, and a pinch grinder that is disposed facing the grinding drum 20 with a predetermined distance therebetween. It has a roller 30.

The grinding drum 20 has a cylindrical shape and is supported by a pair of bearings 61 and 61 so as to be rotatable and movable in the axial direction. The grinding drum 2
A protrusion 21 is formed in a spiral shape on the outer peripheral surface of 0. The protrusion 21 has a flat outer circumferential surface, and diamond abrasive grains 22 are adhered to the outer circumferential surface. The diamond abrasive grains 22 are, for example,
Particles with a particle size in the range of No. 40 to No. 360 are used,
It is adhered to the outer peripheral surface of the protrusion 21 so that the density is 20 to 30% or more. The adhesion of the diamond abrasive grains to the outer peripheral surface of the protrusions 21 is performed by a physical or chemical method. The diamond abrasive grains 22 are used when the belt-shaped object to be ground has a hardness Hs of 50 to 90, for example.
In the case of NBR belts, belts with a particle size of about 40 to 80 are used, bonded together at a density of 40 to 60%. In addition, in the case of CR belts with hardness HS of 50 to 90, the grain size is approximately 60 to 120, and 50 to 80%
It is used by adhering it at a density of .

The protrusion 21 has a height suitable for the grinding thickness of the strip-shaped object,
A plurality of pieces each having a rectangular cross section having a width and a width are formed into a set in a spiral shape. When the belt-like object is a rubber belt, each of the protrusions 21 has a height of 2
A set of 1 to 5 rectangular cross-sections with a width of 5 to 10 mm is formed. Each protrusion 21 may have a trapezoidal cross section, or may have an arcuate corner on its outer peripheral surface.

One end of the rotating shaft 24 of the grinding drum 20 is connected to a motor 23 disposed below, and the motor 23 rotates the rotating shaft 24, thereby rotating the grinding drum 20.

The grinding drum 20 has a double structure, between which cooling water flows in a spiral manner. Cooling water also flows through the rotating shaft 24 .

The other end of the rotating shaft 24 in the grinding drum 20 is
It is connected to a crank motor 26 via a crank mechanism 25. Therefore, the crank motor 26
is rotated by a crank mechanism 25 on a rotating shaft 24.
The grinding drum 2 is changed to a linear motion in the axial direction of
0 is swung in the axial direction. The grinding drum 20 swings back and forth in the axial direction, for example, twice while the outer peripheral surface of the grinding drum 10 is in contact with the strip 10.

Below the grinding drum 20, the grinding drum 2
A pinch roller 30 is disposed parallel to the axis of the roller 0 with a predetermined distance therebetween. The pinch roller 3
0 is lined with rubber, urethane, etc., for example. Each end of the pinch roller 30 is rotatably supported by guide blocks 31 and 31, respectively. Each guide block 31 is screwed into a screw tube 32, which is disposed in a direction perpendicular to the pinch roller 30, respectively. Also,
Each guide block 31 is penetrated by guide rods 33 and 33, which are arranged parallel to each spiral tube 32. The lower ends of each screw rod 32 are connected to output shafts of servo motors 34 and 34, respectively.

Therefore, by the forward and reverse rotation of each servo motor 34, the screw rods 32 rotate forward and backward, and each screw rod 32 rotates in the forward and reverse directions.
The guide block 31 screwed into the guide rod 33
is moved in a direction toward or away from the grinding roller 20.

Such a grinding device inserts a strip 10 between a grinding drum 20 and a pinch roller 30, brings the pinch roller 30 close to the grinding drum 20, presses the strip 10, and removes the strip 10. The surface to be ground is brought into contact with the outer peripheral surface of the protrusion 21 of the grinding drum 20. In this way, the strip 10 is held by the pinch roller 30.
While pressing against the grinding drum 20 with a predetermined pressure, the grinding drum 20 is rotated at a predetermined circumferential speed and axially oscillated at a predetermined speed, and the strip-like material 10 is pinched with the grinding drum 20. roller 30
Between 〓 Let it pass between. The peripheral speed of the grinding drum is
If the strip is a rubber belt, the distance is 1000-1500m/
It is assumed to be min. Then, while the strip 10 passes through the inside, the grinding drum 20 rolls into contact with the top surface of the strip 10 while swinging in the width direction of the strip 10, grinding the top surface of the strip 10. The thickness is set to a predetermined value. At this time, the grinding waste of the strip 10 is removed from each protrusion 2.
There is no risk of the protrusions 21 entering the recesses between the protrusions 21 and adhering to the outer circumferential surface of each protrusion 21.

In such a grinding device, for example, as shown in FIG. 2, a strip 10 is conveyed. Strip 10
One end is held between a pair of guide rollers 41 and introduced into a space between the grinding drum 20 and the pinch roller 30 in the grinding device, and is held between a pair of lead-out rollers 42 and carried out. The pressure with which the guide roller 41 and the lead-out roller 42 clamp the strip 10 is changed by air cylinders 44 and 45, respectively. The surface of the strip 10 ground by the grinding drum 20 is cleaned by a roll brush 43 that contacts the surface, and then
Grinding debris generated during the grinding is removed from the surface of the strip-shaped object 10.

The thickness of the strip 10 ground by the grinding roller 20 is detected by a thickness detector 51 disposed downstream of the lead-out roller 42. The position of pinch roller 30 relative to roller 20 is feedback controlled. As the thickness detector 51, for example, an optical displacement sensor, a magnetic displacement sensor, a capacitance displacement sensor, or the like is used. The detection results of the thickness detector 51 are input to the controller 50. The controller 50
, the strip 10 is set by the thickness setting device 52.
target thickness has been input. The output of the controller 50 is applied to servo motors 34 and 34 that move each end of the pinch roller 30 toward and away from the grinding roller 20, independently controlling each end of the pinch roller 30.

The controller 50 detects the thickness of the strip 10 set by the thickness setting device 52 and the thickness detector 51 . Compare with the actual thickness of the ground strip 10. Then, the controller 50 rotates the servo motors 34 and 34 in order to eliminate the deviation of the actual thickness of the strip from the set thickness of the strip. The controller 50 rotates each servo motor 34 in a predetermined direction to bring the pinch roller 30 closer to the grinding drum 20 if the actual thickness is larger than the set thickness, and if the actual thickness is smaller than the set thickness. , the pinch roller 30 is rotated in the opposite direction so as to be separated from the grinding drum 20, and the pinch roller 30 is moved toward or away from the grinding drum 20 by a distance corresponding to the deviation. The rotation of each screw rod 32 rotated by each servo motor 34 is detected by an encoder or the like, and each servo motor 34 is controlled so that each screw rod 32 rotates at a predetermined number of rotations.

When the strip to be ground is endless, the endless strip 10' is wound between the pinch roller 30 and the tension roller 71, as shown in FIG. In order to apply a predetermined tension,
The position of the tension roller 71 is changed using the air cylinder 72. Then, the strip 10' is
It is moved around so as to pass between the grinding drum 20 and the pinch roller 30, and its surface is ground by the grinding drum 20. In this case, the controller 50 controls a servo motor that moves the pinch roller 30 toward and away from the grinding roller 20 so that the strip 10' has a predetermined thickness. The control contents of the controller 50 are the same as those in the previous embodiment, so the explanation will be omitted.

(Effects of the invention) Since the grinding device of the present invention uses a grinding drum to which diamond abrasive grains are bonded to grind a strip-shaped object, it can reliably grind even long or wide strip-shaped objects. Can be cut uniformly to a predetermined thickness. Since diamond abrasive grains are used, the service life is significantly improved, and there is no need to replace the grinding drum over a long period of time, significantly increasing work efficiency. Grinding waste is
Since it penetrates into the recess between each protrusion, there is no fear that grinding debris will remain between the diamond abrasive grains and cause clogging, and stable grinding accuracy can be obtained.

Since the diamond abrasive grains are bonded to the protrusions on the outer circumferential surface of the grinding drum, this is more economical than the case where the diamond abrasive grains are bonded to the entire outer circumferential surface of the grinding drum. Since the grinding drum is rotated and oscillated in the axial direction, there is no risk of streaks or the like appearing on the surface of the strip due to uneven grinding.
The strip is ground to a uniform thickness.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of the grinding device of the present invention, FIG. 2 is a schematic diagram showing an example of its use, and FIG. 3 is a schematic diagram showing another example of use. 10, 10'... band-shaped object, 20... grinding drum,
21... Projection, 22... Diamond abrasive grain, 30
...Pinch roller.

Claims (1)

[Claims for Utility Model Registration] A cylindrical grinding drum with diamond abrasive grains adhered to the outer circumferential surface of protrusions formed in a spiral shape on the outer circumferential surface and arranged to be rotatable and swingable in the axial direction. a means for rotating the grinding drum; a means for swinging the grinding drum in the axial direction; the grinding drum is arranged to face the grinding drum with a predetermined gap therebetween; A grinding device comprising: a pinch roller that presses the strip against the grinding drum so that one side of the strip can be in rolling contact; and means for moving the pinch roller to adjust the gap.