JPH0442259Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a tensioning device for an endless belt such as a conveyor belt of a belt conveyor or a drive belt of a driven roller conveyor. be.

(Prior Art) In a belt conveyor, as shown in FIGS. 3 and 4, an endless conveyor is formed to form a conveyor section 1 and is wound around support rollers 2, etc. so as to rotate along a predetermined trajectory. The belt 3 is transferred to the return section 4 relative to the conveyance section 1.
, the tension pulley 5 and the snap roller 6 are bent by the take-up roller 7, and by the movement of the take-up roller 7,
A structure is adopted in which the conveyor belt 3 is adjusted to a predetermined tension state, and the movement of the take-up roller 7 is controlled by attaching a take-up frame 9 to the lower part of the left and right side frames 8 of the conveyor. The shaft 11 of the take-up roller 7 is inserted into the elongated hole 10, and this shaft 11 is
The ring portion 13 of the take-up metal fitting 12 is fitted into the frame, the bolt portion 14 of this take-up metal fitting 12 is attached to the take-up frame 9 using a pair of nuts 15 in a position adjustable manner, and the bolt portion 14 is moved by the nut 15. It is carried out by

Similarly, in a driven roller conveyor,
As shown in FIGS. 5 and 6, the conveyance roller 20
An endless drive belt 23, which is wrapped around a push-up roller 22 and the like so as to rotate along a predetermined trajectory, is formed with a drive part 21 in contact with the lower part of the drive part 21.
At the return section 24 for the drive belt 23 , the drive belt 23 is bent by a take-up roller 27 via a tension pulley 25 and a snap roller 26 .
The movement of the take-up rollers 27 is carried out by attaching a take-up frame 29 to the lower part of the left and right side frames 28 of the conveyor, and using long holes in the take-up frame 29. 30 through which the shaft 31 of the take-up roller 27 is inserted, and this shaft 3
1, the U-shaped part 33 of the take-up metal fitting 32 is fitted to the take-up metal fitting 32, the bolt part 34 of this take-up metal fitting 32 is attached to the take-up frame 29 using a pair of nuts 35, and the bolt part 34 is moved by the nut 35. I'm walking around.

Furthermore, as described in, for example, Japanese Patent Publication No. 47-50303, Japanese Utility Model Publication No. 140510/1983, or Japanese Utility Model Publication No. 56-980, a roller body that tensions the conveyor belt is rotatably supported. A configuration in which a bearing is provided in a position-adjustable manner is known.

Among these, Japanese Utility Model Publication No. 56-980 describes a configuration in which the tension of the belt is adjusted by moving the bearing by rotating the head of the bolt without protruding the bolt. There is.

Also, Special Publication No. 47-50303, Utility Model Publication No. 56-
Publication No. 140510 describes a configuration in which bearings supporting both ends of a roller body are each provided with a bolt for position adjustment.

(Problem to be solved by the invention) However, in the case of the structure shown in FIGS. 3 to 6, even if a cover etc. is provided, the bolt parts 14, 34 of the take-up fittings 12, 32 protrude for a long time, making it difficult to operate. It has a poor appearance and is not aesthetically pleasing. Moreover, the conveyor belt 3 and the drive belt 23
When adjusting the tension state of the
This requires the troublesome work of loosening one of the nuts 15, 35, tightening the other to make the adjustment, and finally tightening one of the nuts 15, 35 to fix the adjustment.

According to the structure described in the above-mentioned Japanese Utility Model Publication No. 56-140510, since the bearings and roller bodies, which are positionally adjustable, are provided at both longitudinal ends of the conveyance section of the conveyor belt, the conveyor belt is driven by a drive circuit. However, there is a problem in that the arrangement of the driving pulley to be driven is subject to restrictions.

Furthermore, in the structure described in Japanese Utility Model Publication No. 56-980, the bearing and roller body, which are provided in a freely adjustable position, are considered to be provided at one end or both ends in the longitudinal direction of the conveying section of the conveyor belt. There is a problem in that the arrangement of the drive pulley that drives and rotates the belt is restricted.

In the structure described in Japanese Patent Publication No. 47-50303, since a drive pulley is provided at one end in the longitudinal direction of the conveyor section of the conveyor belt, when the driving direction of the conveyor belt is changed, the tension state of the conveyor belt is The problem is that the adjustment becomes uncertain and meandering is likely to occur.

Furthermore, in both devices, both ends of the roller body are supported between a pair of bearings on both sides that are adjustable in position, so in order to attach or remove the roller body, the bearings must be removed from the bolts. Work such as removing or disassembling the frame is required,
When assembling or repairing the conveyor, it is complicated to attach and detach the roller body and to rotate the conveyor belt, resulting in a problem of poor work efficiency.

The present invention was devised in view of these points, and is a belt tensioning device that adjusts the tension state of an endless belt wrapped around a drive pulley.
It reliably adjusts the tension state of the belt to reliably prevent belt meandering, improves operability such as adjusting the tension state, improves work efficiency, and facilitates equipment assembly and repair. The purpose is to

[Structure of the idea]

(Means for Solving the Problems) The present invention provides an endless belt 43 which is wound around a predetermined locus, and which is connected to a pair of front and rear take-up rollers 45 in a drive section of the belt 43.
In the belt tensioning device, the belt 43 is wound around the drive pulley 46 in a substantially U-shape by a belt tensioner, and the belt 43 is adjusted to a predetermined tension state by the movement of the pair of take-up rollers 45. A support rod 55 is provided on a pair of left and right drive frame frames 52 that rotatably support the drive pulley 46 in a direction perpendicular to the axial direction of the drive pulley 46. A pair of bolts 61 are rotatably provided in a direction perpendicular to the axial direction of the drive pulley 46 and parallel to the support rod 55, and a pair of front and rear roller receiving members 58 are respectively attached to the pair of left and right support rods 55. In addition to being movably supported, grooves 65 facing each other are formed in the pair of front and rear roller receiving members 58, and each of the front and rear bolts 61 on both sides is inserted into each of the front and rear roller receiving members 58 on both left and right sides. Both ends of the pair of front and rear take-up rollers 45 are rotatably supported in the concave grooves 65 of the pair of roller receiving members 58 on both the left and right sides, and each of the front and rear bolts 61 on both the left and right sides are screwed into each other.
A knob 63 for rotational operation is provided at each outer end.

(Function) In the belt tensioning device of the present invention, the bolt 61 is rotated by the knob 63 to move the roller receiving member 58 into which the bolt 61 is threaded along the support rod 55, and the concave groove 65 of the roller receiving member 58 is moved. By moving the take-up roller 45 whose end is supported, the endless belt 43 is adjusted to a predetermined tension state. At this time, meandering adjustment is performed to prevent the belt 43 from meandering by balancing the adjustments at both ends of the take-up roller 45.

(Example) An example of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows a drive section of a belt conveyor. This drive section is an endless belt that forms a conveyance section 41 and is wound around a plurality of support rollers 42 and the like so as to rotate on a predetermined trajectory. A shaped conveyor belt 43 is bent into a substantially U-shape by a pair of front and rear take-up rollers 45 at a return section 44 for the conveyor section 41 and looped around a drive pulley 46 . , 48 and an endless chain 49, the conveyor belt 43 is driven by a motor 50.
Drive around. The drive pulley 46 is rotatably supported between a pair of left and right drive frame frames 52 attached to the lower part of both side frames 51 of the belt conveyor via a bearing (not shown), and the motor 50 is rotatably supported between a pair of drive frame frames 52 on both the left and right sides. is supported via a motor base 53 between the lower portions of the motor.

This drive unit also serves as a tensioning device for the conveyor belt 43, and serves as a tensioning device for the pair of take-up rollers 45.
By this movement, the conveyor belt 43 is adjusted to a predetermined tension state.

That is, as shown in FIG.
5 is installed along the length direction of the conveyor, that is, in a direction orthogonal to the axial direction of the drive pulley 46,
A through hole 57 of a fixing metal fitting 56 is fitted into each of the support rods 55, and a through hole 59 of a pair of front and rear roller receiving members 58 is slidably fitted into each support rod 55 so as to sandwich the fixing metal fitting 56 therebetween. bolts 61 are screwed into the female threaded holes 60 of each roller receiving member 58 in a direction perpendicular to the axial direction of the drive pulley 46 and parallel to the support rod 55, and the tip of each bolt 61 Each bolt 61 is rotatably supported by the fixing fitting 56 via a cotter pin 62, and the head of each bolt 61 is rotatably supported by the outer side of the drive section frame 52. A knob 63 for rotational operation is attached to the head of each of the shafts 64, and both ends of a shaft 64 that rotatably supports each of the take-up rollers 45 are formed so as to face each other in the front and back of each roller receiving member 58. U-shaped groove 6 on the inner surface
5 is fitted and supported.

In this way, according to this embodiment, the drive pulley 4
In the device for adjusting the tension state of the endless conveyor belt 43 that is wrapped around the conveyor belt 6, the adjustment bolt 61 does not protrude and there is only a knob 63, so that the appearance and operability can be improved. can. Furthermore, when adjusting the tension state of the belt 61, the user only needs to rotate the knob 63, which makes the work easier and does not require any tools, thereby improving work efficiency.

Then, each bolt 61 is inserted through each knob 63.
When the roller receiving members 58 are rotated, each roller receiving member 58 moves along the support rod 55 and the bolt 61 due to the screw engagement, so that the end of each take-up roller 45 is moved by the movement of each roller receiving member 58. The tension state of the conveyor belt 43 can be adjusted by changing the bending state of the conveyor belt 43 of the drive section.

In addition, when adjusting the tension state of the conveyor belt 43, the tension balance in the width direction of the conveyor belt 43 can be adjusted by adjusting the balance between both ends of the take-up roller 45, so that the conveyor belt 43 meanders. Meandering adjustment can be made to prevent this.

In addition, this meandering adjustment can be performed using a pair of front and rear take-up rollers 45 that sandwich the drive pulley 46, so depending on the installation position of the device, it can be operated using either the front or rear take-up rollers 45 on the side that is easier to operate. In addition to improving the operability, by adjusting both the front and rear take-up rollers 45, it is possible to adjust the tension balance in the front and rear direction of the conveyor belt 43 with respect to the drive pulley 46.
Even in a belt conveyor whose driving direction can be changed, meandering can be reliably prevented.

Further, since the end portion of the take-up roller 45 is supported by a groove 65 provided front and rear opposite to the pair of front and rear roller receiving members 58, the take-up roller 45 can be easily attached and detached. By removing the take-up roller 45, the conveyor belt 43 can be easily rotated. Therefore, assembly and repair of the device can be facilitated.

[Effect of idea]

As described above, according to the present invention, in a device for adjusting the tension state of an endless belt wrapped around a drive pulley, the adjustment bolt does not protrude and there is only a knob, so that the appearance and appearance are improved. Operability can be improved. Moreover, when adjusting the tension state of the belt, simply turning the knob makes the work easier, and no tools are required, improving work efficiency. When adjusting the tension state of the belt, the tension balance in the width direction of the belt can be adjusted by adjusting the balance at both ends of the take-up roller, so the meandering adjustment can be performed to prevent the belt from meandering. be able to. Furthermore, this meandering adjustment can be performed with a pair of front and rear take-up rollers that sandwich the drive pulley, so it can be operated with the front and rear take-up rollers on the side that is easier to operate, improving operability. By adjusting both the take-up rollers, it is possible to adjust the tension balance of the belt in the front and back direction with respect to the drive pulley, so it is possible to reliably prevent meandering, especially on belt conveyors where the belt drive direction can be changed. can. In addition, the ends of the take-up roller are supported by grooves provided in opposite directions in the front and rear pair of roller receiving members, making it easy to attach and detach the take-up roller. By removing it, it becomes easier to hang the belt around, making it easier to assemble and repair the device.

[Brief explanation of the drawing]

Fig. 1 is a side view of a drive section of a belt conveyor showing an embodiment of the belt tensioning device according to the present invention, Fig. 2 is a longitudinal cross-sectional view of the main parts thereof, and Fig. 3 shows a conventional example. Side view of part of the belt conveyor,
FIG. 4 is a plan view thereof, FIG. 5 is a side view of a portion of a conventional drive type roller conveyor, and FIG. 6 is a plan view thereof. 43... Conveyor belt as a belt, 45...
Take-up roller, 46... Drive pulley, 52
... Drive unit frame, 55 ... Support rod, 58 ...
Roller receiving member, 61...bolt, 63...knob, 65...concave groove.

Claims (1)

[Claim for Utility Model Registration] An endless belt that is wound around a predetermined locus is shaped like a U-shape with respect to a drive pulley by a pair of front and rear take-up rollers in the belt drive section. The belt tensioning device adjusts the belt to a predetermined tension state by moving the pair of take-up rollers. A support rod is provided on each of the drive unit frames in a direction orthogonal to the axial direction of the drive pulley, and a pair of front and rear bolts are respectively provided on the pair of left and right drive unit frames in a direction orthogonal to the axial direction of the drive pulley and the support rods mentioned above. A pair of front and rear roller receiving members is movably supported on the pair of left and right support rods, and a recess is provided in parallel with the rod and rotatably supported, and the pair of roller receiving members are provided with recesses facing each other in the front and rear directions. A groove is formed, and each of the front and rear bolts on both the left and right sides is threaded through each of the front and rear roller receiving members on both sides, and both ends of the pair of front and rear take-up rollers are inserted into the concave grooves of the pair of roller receiving members on both the left and right sides. What is claimed is: 1. A belt tensioning device, characterized in that the belt tensioning device is rotatably supported, and a knob for rotational operation is provided at the outer end of each of the front and rear bolts on both the left and right sides.