JPH0597222A - Belt driving device of conveyer - Google Patents

Abstract

PURPOSE:To transmit driving force from a driving pulley to a belt effectively without causing slip between the driving pulley and the belt even when the tensile force working on the belt is restricted to a minimum level, in a belt conveyer for carrying out belt folding, the end part of which is like knife edge and the like, at an acute angle, so as to move a carrier belt. CONSTITUTION:In a belt conveyer, in which a carrier belt 1 is folded back at an acute angle by belt guide means 2, 3 such as a knife-edged guide member, the belt 1 is provided to a degree that it is not loosened, through tension pulleys 4, 5 provided below a carrier route, so that the belt passes the under surface of a driving pulley 6 provided below and between the respective pulleys, in such a way that the outer periphery of the driving pulley 6 is almost semi- circulated thereby, while the carrier belt 1 is pressed to the outer peripheral surface of the driving pulley 6 by a pressure belt 10 provided between a pair of pulleys 7, 8, in surface contact, and the belt 1 is thus driven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt driving device for a belt conveyor, and more particularly to a belt guide means at the end of the conveyor which is a small-diameter roller or a knife edge having a small radius of curvature and which sharply bends the belt. The present invention relates to a belt drive device that prevents slipping between a belt and a drive pulley when the belt is folded and moved even if the tension of the belt is small.

[0002]

2. Description of the Related Art Conventionally, when an article is conveyed by a belt conveyor and the dimension of each conveyed article is small, both end rollers of the conveyor or conveyors located before and after the conveyor are provided in order to facilitate the delivery of the article from the conveyor to the conveyor. The diameter of the belt is reduced, or both ends or one end of the belt is formed into a knife edge so that the belt is turned or slid into contact with the belt so as to be folded back. At this time, as an attempt to obtain the driving force with the belt tension reduced, for example, the actual fairness 3
As disclosed in Japanese Unexamined Patent Publication No.-30328, there is one in which a roller is pressed against a drive pulley via a belt.

[0003]

By the above, the transfer of articles can be temporarily solved, but the structure of the conveyor still has the following various problems.

Problem 1. The small diameter of the roller around which the belt is stretched is limited to the case of a narrow belt having a relatively wide width in view of its bending and the like. If the belt width is wide, it may be possible to divide the rollers, but this is not a very good method for this type of conveyor that uses extremely thin belts because gaps are created between the rollers.

2. When both ends or one end is formed into a knife edge shape, the belt folding portion is slid, so that the running resistance of the belt increases. The same can be said when the roller diameter is extremely small.

3. When the running resistance of the belt increases, in order to increase the driving force of the belt, a stronger tension is applied to the belt to try to obtain a frictional force with the driving pulley, but the load on the rollers at both ends increases. The roller may bend and cause belt meandering. Further, since the belt tension increases, the load on the drive motor also increases, so that it is necessary to increase the size of the motor.

4. When trying to obtain a driving force with a small belt tension, when the roller is pressed against the driving pulley via the belt as in the conventional method, the pulley and the belt are strongly rubbed. Since it is a so-called linear part, it is difficult to obtain a strong driving force. Further, in order to obtain a stronger driving force, the bearings of the driving pulley and the pressing roller have to be pressed against each other more strongly, which poses a problem that a greater burden is imposed. Furthermore, in this case,
Since the rollers are pressed strongly even when the conveyor is stopped, a habit remains on the belt, and when the operation is resumed after a long time stop, the habit left is unsightly and the belt is difficult to move smoothly.

The present invention has been made in order to solve the above-mentioned problems, and when the rollers at both ends or one end have a small diameter, or when both ends or one end has a knife-edge type conveyor (one end has a small diameter roller In the case where the opposite end has a knife-edge shape, the belt tension is minimized to provide a large driving force.

[0009]

In order to achieve the above object, the belt driving device of the present invention has at least one end, that is, one or both ends of the belt guide means having a small diameter roller or a knife edge having a small radius of curvature. In a belt conveyor provided with a conveyor belt 1 which is folded back and moved to the left and right belt guide means 2 and 3 provided in a circular shape,
The conveyor belt 1 is stretched around the outer circumference of a drive pulley 6 arranged below via tension pulleys 4 and 5 so that the conveyor belt 1 is not folded back by the left and right belt guide means 2 and 3 and is loosened. , The conveyor belt 1 by means of the pressure belt 10 suspended between the pair of pulleys 7 and 8 located on the side of the drive pulley 6 and freely rotating.
Is forcibly pressed against the outer peripheral surface of the drive pulley 6 to drive the conveyor belt 1 so that the belt can be driven with a minimum tension.

When the conveyor belt 1 is pressed against the drive pulley 6 by the pressure belt 10, it is advantageous to provide a pressing adjustment means so as to be adjustable.

As a means for adjusting the pressing force of the pressure belt 10, at least one of the pair of pulleys 7 and 8 on which the pressure belt is suspended is preferably movably provided.

When driving the belt 1 of the curved belt conveyor whose outer sides are arcuate, the drive pulley 6 has a frustoconical shape with its outer peripheral surface inclined, and the belt 1 is driven by the drive pulley 6. As the pressure belt 10 to be pressed against, it is desirable that the narrow belts 10a such as a plurality of round belts arranged in parallel are separately circulated.

[0013]

In the belt drive device constructed as described above,
The wrapping angle of the conveyor belt with respect to the drive pulley is increased, and pressure is applied to the frictional portion between the drive pulley and the conveyor belt by surface contact with the pressure belt to increase the frictional force. It is possible to obtain a driving force that is incomparably stronger than the friction due to the pressing of the line contact such as the pressing of the roller through the roller. Therefore, the conveyor belt can be driven with a minimum tension by tensioning the conveyor belt so as not to sag.

Further, since the pressing of the pressure belt against the conveying belt is a surface contact, the pressing force per unit area is extremely small, it is possible to prevent the belt from having a bad habit, and further, the pressing against the drive pulley is performed. Since the belt is applied from the peripheral direction of the contact area, the load on the bearing of the drive pulley is greatly reduced.

When the conveyor belt is pressed against the drive pulley by the pressure belt, one or both shaft centers of the pair of pulleys on which the pressure belt is suspended as the pressing adjustment means are moved to press the pressure belt and the wrapping angle. The required setting can be easily performed, and the driving force can be easily increased while keeping the minimum tension.

Further, when driving the belt of the curved belt conveyor, the drive pulley has a frustoconical shape with an inclined outer peripheral surface, and a plurality of round belts arranged in parallel as pressure belts for pressing the conveyor belt against the drive pulley,
By separately wrapping each narrow belt such as a V-belt, the contact surface does not slip and the conveyor belt is securely attached to the outer peripheral surface of the frustoconical drive pulley at each part in the width direction. The pressing force can be effectively transmitted to the conveyor belt.

[0017]

Embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 illustrates an embodiment of the present invention in which both ends of a general conveyor having a straight conveying path are formed in a knife edge shape. In the figure, reference numeral 1 denotes a flat belt having a predetermined width and a small thickness, for example, a polyurethane resin cover, which is stretched between the knife-edge-shaped guide members 2 and 3 at both ends of the conveyance path. A belt support member 9 having a predetermined length (not shown in the figure, the length is short) is movably supported on the upper surface thereof. Knife edge guide members 2 on both ends
No. 3 has a tip with a small radius of curvature so that the belt can smoothly and sharply change direction, facilitating the delivery of small-sized conveyed articles to an adjacent conveyor or the like. .. A pair of tension pulleys 4 and 5 are arranged at a predetermined position below a supporting member 9 which constitutes a conveyance path, and a drive pulley 6 having a predetermined diameter is belt-driven by a motor 11 to rotate at a predetermined position below and between them. The conveyor belt 1 is folded back by the guide members 2 and 3 and passes through the inner peripheral surfaces of the tension pulleys 4 and 5 facing each other and the lower surface of the drive pulley 6 halfway around the peripheral surface of the drive pulley 6. The tension pulleys 4 and 5 are adjusted so that they do not come loose.

Below the drive pulley 6, a pair of pressure belt pulleys 7 and 8 facing each other at a position sandwiching the drive pulley 6 are provided, respectively.
The support shafts 14 and 15 supported between 16, 17 and 17 are rotatably arranged via ball bearings and the like (see FIG. 2). The opposing pulleys 7 and 8 are surrounded by a predetermined length. A pressure belt 10 having a predetermined width is suspended so that its upper surface abuts the lower surface of the drive pulley 6. Then, the support shaft 14, 16 between the frame plates 16, 16, 17, 17.
For the support of 15, the oval-shaped shaft ends of the support shafts 14 and 15 are inserted into the long holes (one is formed long for tension) formed in the frame plate, respectively, so that they can be horizontally moved. The shaft ends are moved by pushing the shaft ends with the adjusting screws 18 and 19 attached to the frame plate respectively, and the pressing of the conveyor belt 1 against the outer peripheral surface of the drive pulley 6 by the pressure belt 10 is adjusted. It has become.

A pulley 7 for the pressure belt,
The frame plates 16 and 17 for supporting 8 are provided at predetermined positions on the upper surface of the base frame 29 which is laterally bridged between the left and right support frames 12 and 13 which are vertically installed on the lower substrate 20 so as to face each other at a predetermined interval. Is stuck to.
On the base frame 29, screw rods 21 and 22 are hung and planted on the left and right sides of the bottom part for adjusting the vertical position. The screw rods 21 and 22 have guide rings 23 and 24, the lower portions of which are fixed to the upper surface of the substrate 20.
The left and right height adjusting members 25 and 26, which are respectively screwed into the screw rods 21 and 22 by passing through, contact the upper surfaces of the guide rings 23 and 24 and rotate the adjusting members 25 and 26, respectively. The height can be adjusted. After the height of the base frame 29 is adjusted, the base frames are adjusted to the positions after the height adjustment by the fixing screws 27 and 28 which are inserted into the long holes formed in the left and right support frames 12 and 13 and screwed into the base frame 29. Secure 29.

The pressing of the conveyor belt 1 against the drive pulley 6 by the pressure belt 10 is performed by adjusting the axial center positions of the left and right pulleys 7, 8 on which the pressure belt 10 is suspended and by arranging them on the upper surfaces of the pulleys 7, 8. By adjusting the pressing force of the pressure belt 10 against the drive pulley 6, the wrapping angle and the tension force of the pressure belt in combination with the height adjustment of the base frame 29, the pressing force by surface contact is adjusted to apply tension to the conveyor belt. In addition, the conveyor belt can be driven with a large driving force with a minimum tension.

3 to 5 relate to a second embodiment of the present invention. FIG. 3 is a plan view of a main part of a knife edge curve conveyor to which the present invention is applied, and FIG. 4 is a schematic view of the main part of FIG. This conveyor facilitates transfer from conveyor to conveyor when individual small sized conveyed articles are redirected and conveyed. In the figure, reference numeral 1 denotes a belt whose outer sides are arcuate (when expanded, it is a ring having a predetermined width with a conical surface being cut), and is a thin belt similar to the first embodiment. Knife edge-shaped guide members 2 and 3 each having a small arcuate tip end having a predetermined width corresponding to the belt width are substantially orthogonal to each other at both ends of the conveying path of the knife edge curve conveyor. It is arranged as follows.
A pair of tension pulleys 4 and 5 are arranged below the curved conveyance path, each of which is composed of a large number of small width rollers 4a and 5a divided in the width direction, and a predetermined lower portion in the middle between them. A frusto-conical drive pulley 6 having an inclined outer peripheral surface at a position is rotatably driven by a belt driven by a motor 11. Then, the conveyor belt 1 having a predetermined shape of which both sides are arcuate is provided with the knife edge guide members 2 and 3.
The tension pulleys 4 and 5 are folded back to face each other and extend halfway around the outer circumference of the frustoconical drive pulley 6 through the inner outer circumferential surfaces of the tension pulleys 4 and 5 and are stretched so as not to loosen via the lower surface thereof.

Below the frustoconical drive pulley 6, a pair of pressure belt pulleys 7 and 8 are disposed in the width direction so as to face the position where the drive pulley is sandwiched. The round belt pulleys 7a and 8a are arranged in parallel, and each round belt pulley is rotatably disposed on a support shaft supported between opposing frame plates (see FIG. 5). And a group of pulleys 7a facing each other,
A plurality of round belts 10a, 10a are encircled between 8a as a pressure belt 10 in a width direction and are rotatably suspended between respective round belt pulleys, and each round belt has its outer surface inclined at its upper surface. The conveyor belt 1 is pressed against the lower surface of the drive pulley 6. In FIG. 5, each of the round belt pulleys 8a constituting the drive pulley 8 on the front right side is rotatably arranged on the pulley support shaft 15 supported between the opposing frame plates 17 and arranged in parallel. Round belt 10a, 10a ─
Is shown to be guided. In addition, a pressure belt consisting of multiple rows of round belts 10a, 10a
Although the horizontal adjustment of the left and right pulleys 7 and 8 with respect to the truncated frustoconical drive pulley 6 of 10 and the vertical adjustment of the frame plate supporting the plurality of pulleys 7a and 8a for round belts are also not shown, It is performed in the same manner as in the above example.

In the above, when the conveyor belt 1 is pressed against the frustoconical pulley 6 by the pressure belt, the peripheral speed is different at each position in the belt width direction of the inclined outer peripheral surface of the drive pulley 6, but the width of the pressure belt is different. Since a plurality of circular belts 10a divided in the directions correspond to different peripheral speeds at respective positions, they can be pressed completely in close contact with each other, and the conveyor belt abutting on the drive roller 6 is effectively pressed to the belt 1. The driving force can be transmitted.

Although the flat belt is used as the pressure belt 10 in the first embodiment, it is possible to use a rib belt having an uneven surface on one side. However, it is also possible to arrange a plurality of ridge widths in parallel depending on the shapes of the conveyor belt and the drive pulley. Further, in the second embodiment, a plurality of round belts 10a are used, but it is of course possible to use a V belt instead of this. Further, in the above embodiment, the belt guide member of the belt folding portion at both ends of the conveying path is an edge shape, but one may be an edge shape, the other may be a small diameter roller, further, when pressing the pressure belt, A pair of pressure belt pulleys were moved up and down, and the belt shaft centers were allowed to move horizontally on the frame plate (one can be largely moved), but one pulley shaft center position was fixed and the other pulley was fixed. The pressure belt may be pressed against the shaft center so as to be rotatable, and it goes without saying that various modifications can be made without departing from the scope of the invention.

[0026]

According to the belt driving device for a conveyor of the present invention as set forth in claim 1, the conveyor belt is formed at an acute angle by using a small-diameter roller or a knife-edge-shaped guide member having a small radius of curvature at the end of the belt conveyor. When it is folded back and moved, when the conveyor belt is driven by the drive pulley, the belt is also pressed by the pressure belt to drive the belt, so that the belt is pressed against the drive pulley by surface contact even if the tension of the belt is reduced. The belt can be effectively driven without slipping. Therefore, since the belt can be driven with the minimum tension, it is possible to reduce the resistance of the belt folded portion at the end of the conveyor to prevent the loss of the driving force and to extend the life of the belt.

According to the second aspect of the present invention, when the pressure belt is pressed, the pressing force, the winding angle, and the belt tension force of the pressure belt are adjusted by the adjusting means, so that the conveyor belt and the drive pulley are separated from each other. The frictional force between them can be easily set to a good state, and the power can be effectively transmitted from the drive pulley to the conveyor belt.

According to the third aspect of the invention, when the pressing of the pressure belt is adjusted, the pressing force can be easily adjusted by adjusting the tension of the pressure belt or the like.

According to the fourth aspect of the present invention, when the conveyor belt of the curved belt conveyor is driven, the conveyor belt whose peripheral speed differs depending on the axial position of the drive roller is used as a pressure belt in the belt width direction. Due to the large number of divided width belts, the conveyor belt can be reliably pressed against the inclined outer peripheral surface of the drive pulley at each part in the width direction without slipping, and the driving force can be effectively transmitted to the conveyor belt. it can.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention,

2 is a partial cross-sectional view of FIG.

FIG. 3 is a plan view of an essential part of a knife edge curve conveyor according to the present invention,

FIG. 4 is a schematic diagram of a main part of the present invention as viewed from B of FIG. 3;

5 is a side view showing the relationship between the drive pulley and the pressure belt in FIG.

[Explanation of symbols]

1 conveyor belt 2,3 belt guide means (knife edge guide member) 4,5 tension pulley 6 drive pulley 7,8 pressure belt pulley 9 conveyor belt support member 10 pressure belt 10a ridge belt (round belt).

Claims (4)

[Claims] 1. A conveyor belt 1 having a belt guide means at least at one end portion which is folded back and moved sharply into left and right belt guide means 2, 3 having a small diameter roller or knife edges having a small radius of curvature. In the belt conveyor, the conveyor belt 1 is moved to the left and right belt guide means 2, 3
The drive pulley 6 disposed below through the tension pulleys 4 and 5 is stretched substantially half way around the tension pulleys 4 and 5 so as not to slacken and suspended between the pair of pulleys 7 and 8 on the side of the drive pulley. A belt drive in a conveyor, characterized in that the pressure belt (10), which is freely rotated, is pressed against the outer peripheral surface of the drive pulley (6) to drive the conveyor belt (1) with a minimum tension. apparatus. 2. A conveyor belt 1 using a pressure belt 10.
2. The belt drive device for a conveyor according to claim 1, wherein the pressing of said drive pulley 6 with respect to said drive pulley 6 can be adjusted by a pressing adjustment means. 3. A pressure belt 10 is provided with a pair of pulleys 7 on which the pressure belt is suspended.
3. The belt drive device for a conveyor according to claim 2, wherein at least one of the shaft centers 8 is provided so as to be movable. 4. The drive pulley 6 has a frustoconical shape in which the outer peripheral surface of the conveyor belt 1 is inclined so as to drive the conveyor belt 1 of the curved belt conveyor, the outer sides of which are arcuate, and the belt 1 is driven by the drive pulley 6. The pressure belt 10 to be pressed against is a narrow belt 10 such as a plurality of parallel round belts.
4. A belt drive device for a conveyor according to claim 1, 2 or 3, wherein a is provided so as to be independently rotatable.