JPH0748014A - Belt tension detecting method and its device in belt conveyer - Google Patents

Abstract

PURPOSE:To provide a method to detect the tension of a belt timely and simply and its device in a belt conveyer having a screw take-up system belt tension adjusting means. CONSTITUTION:The screw lever 14 of a belt tension adjusting means 10 is rotated to slightly move a bearing box 19 in the direction of belt tension, and a spacer 22 and a load cell 23 are insertedly provided between the bearing box 19 and the one side end of a frame 18. Next the screw lever 14 is loosen until the tensile force caused by the screw lever 14 of the bearing box 19 is zero to apply the belt tension to the load cell 23, and load acting then on the load cell 23 is measured. Thus the tension of the belt 4 can be detected simply at any time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a method and apparatus for detecting a conveyor belt tension of a belt conveyor, and more particularly, to a belt using a screw take-up type belt tension adjusting means applied to a belt conveyor having a short machine length. And apparatus for detecting tension in a sheet.

[0002]

2. Description of the Related Art Two types of belt conveyors are known as means for adjusting the tension of the belt, a take-up method using a weight and a screw take-up method using a screw. The screw take-up method is, for example, 30
Machine lengths less than a meter are used for short conveyors.

[0003]

Particularly, in such a screw take-up type conveyor, there is a problem in that a belt is stretched and loosened during operation, which causes a large meandering, and a spill of a conveyed product occurs. Is occurring. However, under the present circumstances, there is no proper method for detecting and managing the belt tension, and a method is adopted in which tension is increased after a trouble occurs, or the tension of the belt is visually checked and readjusted.

The present invention enables a belt tension in a belt conveyor to be detected in a timely manner and prevent the above-mentioned problems from occurring in advance, instead of a post-processing method that takes a countermeasure after a problem has occurred as in the conventional case. It is an object of the present invention to provide a tension detecting method and device.

[0005]

In order to achieve the above object, a belt tension detecting method in a belt conveyor according to the present invention comprises a bearing box for pivotally supporting a take-up pulley around which a belt is wound, and a bearing box in a rectangular frame. The belt is attached so that it can move in the direction in which the belt is tensioned, and the tip of the screw rod screwed from one end of the frame is rotatably connected to the bearing box, and the bearing box is moved in the moving direction by the rotation of the screw rod. Then, in the belt conveyor provided with the belt tension adjusting means for tensioning the belt, the bearing box is slightly moved in the tension direction by the rotation of the screw rod, and one of the bearing box and the frame at that time is moved. A spacer and a load cell are inserted between the end portion and the screw rod, and then the screw rod is loosened until the tensile force of the bearing box by the screw rod becomes zero. The belt tension is applied to the LE, it is characterized by measuring the load exerted on the load cell at that time.

The invention of this method is preferably carried out in the following manner. (1) The spacer and the compression type load cell are inserted between the end of the bearing box on the side opposite to the screw rod and the inner surface of the frame facing the end. (2) After setting the belt tension for the first time, leave the spacer and load cell unchanged, and replace only the spacer with a different length when necessary. (3) Use a spacer whose length can be adjusted. (4) Insert an extension type load cell and a spacer as a gap adjusting liner between the end of the bearing box on the same side as the threaded rod and the inner surface of the frame facing this end, and attach each end of them. The parts are fixed or locked to the end of the bearing box and the inner surface of the frame facing it, respectively.

A belt tension detecting device for a belt conveyor according to the present invention which achieves the above object moves a bearing box which pivotally supports a take-up pulley around which a belt is wound in a rectangular frame in a direction in which the belt is tensioned. The tip of the screw rod, which is mounted as possible and is screwed from one end of the frame, is rotatably connected to the bearing box, and the rotation of the screw rod moves the bearing box in the moving direction to tension the belt. A belt tension detecting device in a belt conveyor including the belt tension adjusting means described above, characterized by including a spacer and a load cell inserted between the bearing box and one end of the frame.

In carrying out the invention of this apparatus, it is preferable to add the following configuration. (5) By loosely fitting the tip of the screw rod so as to project into the opening formed in the bearing box, and by providing the tip of the screw rod with a tip piece for retaining that can be loosened in the opening. The screw rod is connected to the bearing box so as to be slightly movable in the axial direction and rotatable. (6) Use a spacer whose length can be adjusted.

[0009]

By rotating the screw rod of the belt tension adjusting means, the bearing box is slightly moved in the belt tension direction, and the spacer and the load cell are placed between the bearing box and one end of the frame at that time. After inserting it, loosen the screw rod until the tension of the bearing box by the screw rod becomes zero,
By applying the belt tension to the load cell and measuring the load applied to the load cell at that time, the belt tension can be easily detected at any time.

[0010]

EXAMPLE FIG. 7 is a pipe conveyor which is a kind of belt conveyor suitable for carrying out the tension detecting method of the present invention.
It is a schematic side view of (1).

The pipe conveyor (1) is a drive pulley.
A part of the endless belt-shaped conveyor belt (4) hung between (2) and the tail pulley (3) is rounded into a pipe shape, and the conveyed product input from the input port (5) is wrapped in it. Discharge port (6)
It is designed to be transported to.

In such a pipe conveyor (1),
For those with a short machine length, a screw take-up type belt tension adjusting means (10) is adopted as take-up. That is, the conveyor belt (4) is the front drive pulley.
A pair of vent pulleys provided on the return path after running around (2)
(7) It is pulled out downward from between (7), and the pulled out portion is stretched over the take-up pulley (11) and the fixed pulley (9). Screw this take-up pulley (11)
(14) Move it as shown by the arrow (D) by (Fig. 8),
The tension of the conveyor belt (4) is adjusted. The code
(8) is a snap pulley.

FIG. 1 shows an example of the belt tension adjusting means (10). On the base (13) is a rectangular frame long in the front-back direction.
(18) is stuck. Bearing box (19) supporting the shaft (17) of the take-up pulley (11) around which the conveyor belt (4) is wound
Is mounted in the frame (18) so as to be movable in a direction in which the conveyor belt (4) is tensioned by being guided by rails (16) and (16) provided above and below the inner surface of the frame (18). .

As shown in FIGS. 1 to 4, an opening (20) is formed at the center of the front end (left side of the drawing) of the bearing box (19). In this opening (20), a retaining ring (retaining means) (21) attached by a pin (24) (FIGS. 3 and 4) to a rear end portion of a screw rod (14) penetrating from the front side. However, they are fitted together with the screw rod (14) so that they can be slightly loosened in the front-rear direction.

The screw rod (14) extends substantially horizontally forward of the bearing box (19) and penetrates the front portion of the frame (18), and is a screw hole (not shown) formed in the frame (18). The handle (1
5) is fixed.

The other end portion (right side in the figure) of the bearing box (19) is flat, and the load cell (23) is provided between the bearing box (19) and a post (18a) at the rear portion of the frame (18) facing the flat surface. And spacers (22)
The connection body with is inserted as described later.

In this embodiment, the load cell (23) is a compression type strain gauge type, and the spacer (22) is a load cell.
The length is sufficient to fill the gap between the pillar (18a) of the frame (18) and the pillar (23).

By rotating the handle (15) of the screw rod (14) connected to the bearing box (19), the bearing box (19) is indicated by the arrow (D).
The tension of the conveyor belt (4) hung on the take-up reel (11) is adjusted as shown in FIG.

As shown in FIG. 2, the take-up pulley (1
1) has a wide width corresponding to the conveyor belt (4), and the mechanism shown in FIG. 1 is similarly installed on both sides of the conveyor belt (4).

Now, the tension of the conveyor belt (4) is detected as follows. First, the handle (15) is rotated to rotate the screw rod (14) in a predetermined belt tightening direction to move the bearing box (19) forward. At this time, screw rod (1
The ring (21) attached to the 4) with the pin (24) is brought into contact with the wall on the left side of the opening (20) of the bearing box (19) as shown in FIG. Pull to. Therefore, a gap (A) is formed on the right side of the ring (21) up to the wall on the right side of the opening (20).

With the tension applied to the conveyor belt (4) in this manner, the load cell (2) described with reference to FIG.
3) and the spacer (22) to the right end of the bearing box (19) and the frame (1
Insert it between the pillars (19a) of 8).

Next, when the handle (15) is rotated in the opposite direction to loosen the screw rod (14), the opening (20) of the bearing box (19) has been opened until now.
The ring (21), which was in contact with the left side wall portion of the, separates from the ring (21), and play (play) occurs therebetween. In this case, the tensile force of the bearing housing (19) by the screw rod (14) becomes zero.

In this state, the tension of the conveyor belt (4) is applied to the load cell (23) through the take-up pulley (11), the shaft (17) and the bearing box (19), so that the load cell (23)
By measuring the load applied to the belt, the tension of the conveyor belt (4) can be detected.

The belt tension can be detected at any time even after the belt conveyor is installed. At this time, when the elongation of the conveyor belt (4) becomes large due to use, the spacer (22) is also replaced with a long one as the tension force is readjusted. However, as shown in the modification of FIG.
If 2) is composed of a block (22a) with a screw hole in the center and a bolt (22b) screwed into this screw hole, it will be between the bolt head (22c) and the end of the block (22a). Adjustable length can be set.

FIG. 6 shows a second embodiment of the present invention. In this embodiment, a stretchable load cell (23a) is used as the load cell.
Of the bearing box (19) on the opening (20) side, that is, the screw rod.
It is located on the (14) side.

This extension type load cell (23a) is H-shaped when viewed from the side, and the upper and lower parts of one vertical part are bearing boxes (1
Secure to 9) with bolts (26). The other vertical portion of the stretchable load cell fits into a spacer having one end shaped to embrace it, the adjustment liner (25). The other end of this adjustment liner (25) has a similar shape and the frame (1
Similarly fit the overhanging part (27) attached to the pillar of 8).
This projecting portion (27) also has a shape corresponding to half of the above-mentioned H-shape.

According to this second embodiment, when the screw rod (14) is loosened, one end is fixed to the bearing box (19) and the other end is locked to the frame (18) via the adjustment liner (25). The stretchable load cell (23a) thus pulled is pulled by the tension of the conveyor belt (4), and by measuring the load applied to this load cell (23a),
The tension of the conveyor belt (4) can be detected.

[0028]

According to the present invention, the screw rod of the belt tension adjusting means is rotationally operated to slightly move the bearing box in the belt tension direction, and the bearing box and the one end of the frame at that time are moved. By inserting a spacer and a load cell in between, and then simply unscrewing the screw rod, the tension of the belt can be easily detected at any time, and the tension level of such belt can be checked while checking the tension level. Since the belt tension can be adjusted in a well-balanced manner, problems such as belt meandering can be avoided in advance, so that the operating efficiency can be improved and the life of the conveyor belt can be extended.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a portion of a belt tension adjusting means of a first embodiment of the present invention.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is an enlarged side view of a main part of FIG.

FIG. 4 is an enlarged side view of the same main portion as in FIG. 3 in different operating states.

FIG. 5 is a schematic side view of a portion similar to FIG. 1, showing a modified example of the spacer.

FIG. 6 is a schematic side view of a portion similar to FIG. 1, showing a second embodiment of the present invention.

FIG. 7 is a schematic side view of a pipe conveyor suitable for implementing the present invention.

[Explanation of symbols]

(1) Pipe conveyor (2) Drive pulley (3) Tail pulley (4) Conveyor belt (5) Input port (6) Discharge port (7) Vent pulley (8) Snap pulley (9) Pulley (10) Belt tension adjusting means ( 11) Take-up pulley (13) Base (14) Screw rod (15) Handle (16) Rail (17) Axis (18) Frame (18a) Column (19) Bearing box (20) Opening (21) Ring (removal) (22) Spacer (22a) Block (22b) Bolt (22c) Head (23) Load cell (23a) Extendable load cell (24) Pin (25) Adjustment liner (26) Bolt (27) Overhang

Claims (8)

[Claims] 1. A screw rod in which a bearing box which pivotally supports a take-up pulley around which a belt is movably mounted is movably mounted in a rectangular frame in a direction in which the belt is tensioned, and which is screwed from one end of the frame. A belt conveyor having a belt tension adjusting means for rotatably connecting a tip portion to the bearing box, moving the bearing box in the moving direction by rotation of a screw rod, and tensioning the belt. Due to the rotation, the bearing box is slightly moved in the belt tension direction, the spacer and the load cell are inserted between the bearing box and one end of the frame at that time, and then the screw rod is attached to the screw rod. A belt conveyor characterized by loosening until the tensile force of the bearing box by 0 becomes zero, applying belt tension to the load cell, and measuring the load on the load cell at that time. Belt tension detection method of in. 2. The spacer and the compression type load cell are inserted between the end of the bearing box on the side opposite to the threaded rod and the inner surface of the frame facing the end. A method for detecting belt tension in a belt conveyor. 3. The tension of the belt in the belt conveyor according to claim 1, wherein the spacer and the load cell are left as they are after the initial setting of the belt tension, and only the spacer is replaced with one having a different length when necessary. Detection method. 4. The belt tension detection method for a belt conveyor according to claim 1, wherein a spacer whose length can be adjusted is used. 5. An extension type load cell and a spacer used as a clearance adjusting liner are inserted between the end of the bearing box on the same side as the threaded rod and the inner surface of the frame facing the end, and The belt tension detection method for a belt conveyor according to claim 1, wherein each end is fixed or locked to the end of the bearing box and an inner surface of a frame facing the end, respectively. 6. A bearing box for pivotally supporting a take-up pulley around which a belt is wound is mounted in a rectangular frame so as to be movable in a direction in which the belt is tensioned, and is screwed from one end of the frame. A belt tension detecting device in a belt conveyor including a belt tension adjusting means for rotatably connecting a tip portion to the bearing box and moving the bearing box in the moving direction by rotation of a screw rod to tension the belt. A belt tension detection device in a belt conveyor, comprising: a spacer inserted between a bearing box and one end of a frame; and a load cell. 7. The screw rod has a tip end portion loosely fitted into an opening formed in the bearing box, and a tip end of the screw rod is provided with a retaining means capable of floating in the opening. 7. The belt tension detecting device for a belt conveyor according to claim 6, wherein the screw rod is connected to the bearing box so as to be slightly movable and rotatable in the axial direction. 8. The belt tension detecting device for a belt conveyor according to claim 7, wherein the spacer is a spacer whose length is adjustable.