JPH07179215A - Tensile force adjusting mechanism for belt conveyor - Google Patents

Abstract

PURPOSE:To facilitate adjusting operation by rationalizing the adjusting operation and turn-stop operation as a series of operations. CONSTITUTION:An adjusting block part 60 is arranged on the end of a lengthwise frame part, and a long groove 61 in which a pivot 21a of a roller is slidably fitted and inserted in the tensile force direction is bored in the adjusting block part 60, and in a turn-stop mechanism, a seat surface 63 having a width in a degree that a screw head 69b of an adjusting screw 69 is just seated is protrusively formed in a head part 62 of the adjusting block part 60, and holds a turn-stop plate 65 in which a turn-stop hole 65a is bored to make rotation impossible when the seat surface 63 relatively protrudes and retreats and the screw head 69b of the adjusting screw 69 is fitted. Thereby, the turn-stop plate 65 is energized to and held in a stopping position where the seat surface 63 sinks and the screw head 69b of the adjusting screw 69 is fitted in the turn-stop hole 65a, and is arranged so that a plate surface is lowered to a degree of continuing to the seat surface and the screw head 69b of the adjusting screw 69 is released when the turn-stop plate 65 is pressed against the head part 62 of the adjusting block part 60 against energizing force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt conveyor tension adjusting mechanism in which a belt is wound around two rollers supported between both ends of a supporting frame having a pair of longitudinal frame portions extending in parallel.

[0002]

2. Description of the Related Art In a conventional belt conveyor tension adjusting mechanism, an adjusting screw is inserted into a roller shaft, and the adjusting screw is twisted to move the roller shaft for adjustment. What was done with nuts was common.

[0003]

However, in such a conventional tension adjusting mechanism for a belt conveyor, two operations, that is, an adjusting operation and a rotation stopping operation, have to be performed every time adjustment is performed, which is a complicated task. Also, there was a problem that it was difficult to adjust.

The present invention has been made in view of such conventional problems, and a belt for facilitating the adjusting operation by rationalizing the adjusting operation and the detent operation as a series of operations. It is an object to provide a tension adjusting mechanism for a conveyor.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a support frame having two longitudinal frame portions (11) extending in parallel and supported between both ends of a supporting frame. In a tension adjusting mechanism of a belt conveyor, which comprises a belt (30) wound around two rollers (21, 25), an adjusting block part (60, 60) is provided at an end of the longitudinal frame part (11), and the adjusting block part is provided. (6
0, 60) is provided with a long groove (61) into which the pivot shaft (21a) of the roller (21) is slidably fitted in the tension direction, and is screwed into the pivot shaft (21a) for adjustment movement by a screw action. Adjusting screw (69) for adjusting the adjusting block (60, 60)
Through the head portion (62) of the adjusting screw (69) and the head (62) is provided with a rotation stopping mechanism for the adjusting screw (69). The head surface (62) of the (60, 60) is formed with a seat surface (63) projectingly formed so that the screw head (69b) of the adjusting screw (69) is just seated, and the seat surface (63).
Relatively appear, and the screw head (6) of the adjusting screw (69)
9b) Non-rotating hole that prevents rotation when fitted (65
a) is formed by holding a detent plate (65) perforated,
The anti-rotation plate (65) is biased and held in a stop position where the seat surface (63) is depressed and the screw head (69b) of the adjusting screw (69) fits into the anti-rotation hole (65a). At the same time, when the anti-rotation plate (65) is pressed against the head portion (62) of the adjustment block portion (60, 60) against the biasing force, the plate surface is lowered to the extent that the plate surface is continuous with the seat surface (63). The tension adjusting mechanism of the belt conveyor is characterized in that the screw head (69b) of the adjusting screw (69) is opened.

In the above description, the adjusting screw (6
Although it is described that 9) is screwed to the pivot shaft (21a), this screwing also involves an indirect case where a nut is placed on the back side of the pivot shaft (21a) and the adjusting screw (69) is screwed to this nut. Needless to say, it is included.

[0007]

In the belt (30) conveyor, the belt (30) moves between the two rollers (21) supported between both ends of the support frame according to the rotation of the roller (21). The tension of the belt (30) is adjusted by adjusting block portions (60, 60) provided at the end of the longitudinal frame portion (11).
By moving the roller (21) in the longitudinal direction of the longitudinal frame portion (11) which is the direction of tension of the belt (30).

In the adjustment block portion (60, 60), the pivot shaft (21a) of the roller (21) is slidable in the tension direction in the long groove (61), and the adjustment screw screwed onto the pivot shaft (21a). When (69) is rotated, the pivot ((2
1a) adjusts and moves, and the roller (21) moves in the longitudinal direction, so that the tension increases when moving away, and the tension decreases when approaching.

The adjusting screw (69) is normally held by a rotation stopping mechanism so as not to rotate, and the adjusting screw (69) is
When turning 9), release the anti-rotation mechanism and adjust screw (6
9) Make it rotatable. That is, normally, the rotation stop plate (65) is held at a stop position floating above the seat surface (63) formed on the head (62) of the adjustment block (60, 60), and the adjustment screw (65) is held. 69) screw head (69b)
Is fitted in the rotation stop hole (65a) of the rotation stop plate (65) so that it cannot rotate.

A box wrench is suitable as a tool for making the rotation stopping plate (65) rotatable. That is, when the box wrench is fitted to the screw head (69b), the outer peripheral portion of the box wrench is in a state of pushing the anti-rotation plate (65), and when the box wrench is lightly pushed, the anti-rotation plate (65) resists the biasing force. Head (6) of the adjusting block (60, 60)
It is pressed against 2) and the plate surface is lowered to the extent that it continues to the seat surface (63), and the screw head (69b) of the adjusting screw (69) is pulled out from the rotation stop hole (65a) and opened. Then, when the box wrench is rotated, the screw head (69b) is rotated, the adjusting screw (69) is rotated, and the position of the roller (21) is adjusted.

When the rotation of the adjusting screw (69) is stopped and the box wrench is removed from the screw head (69b) of the adjusting screw (69), the anti-rotation plate (65) is lifted to the stop position by the urging force, and the anti-rotation hole is formed. Since (65a) fits on the screw head (69b) of the adjusting screw (69), the adjusting screw (69) is prevented from rotating.

In short, use a box wrench to adjust the adjustment screw (6
By depressing or releasing the screw head (69b) of 9), the rotation is naturally stopped or opened, so that the operator can carry out the adjustment operation with almost no awareness.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention.

The belt conveyor 1 includes a belt 30 and a pair of rollers 21 and 25 supported at both ends of a support frame 10.
The cylinder 40 is arranged so that the operating rod 41 reciprocates along the moving direction of the belt 30, and the chain 50 is arranged along the cylinder 40.

The support frame 10 has a longitudinal frame portion 11
And the drive unit frame 15 are fixedly connected to each other.
The longitudinal frame portion 11 is formed by connecting a pair of vertical frames 12 and 12 arranged in parallel to each other with a horizontal frame 13,
The adjustment block portions 60, 60 are fitted to the ends of the two, and the driven roller 21 is pivotally supported in a long groove 61 formed in the adjustment block portion 60 via a pivot shaft 21a.
The pivot 21a is fitted in the long groove 61 so as to be slidable in the tension direction of the belt 30 so that the roller 21 can slide in the tension direction of the belt 30.

Pivot brackets 16 and 16 are fixed to the ends of the drive unit frame 15, and the pivot brackets 16 and 16 are fixed.
A pivot shaft 26 between which a roller 25 on the drive side is movably supported
Has been erected. The drive-side roller 25 integrally has a transmission shaft 28.

The base of the cylinder portion 42 of the cylinder 40 is pivotally attached to the lateral frame 17a of the drive unit frame 15 by a connecting pin 43 so as to be able to roll laterally. A guide rod 44, which is parallel to the operating rod 41 of the cylinder 40, is installed on the horizontal frames 17a and 17b, and a moving member 45 whose one end is guided by the guide rod 44 is connected to the tip of the operating rod 41 of the cylinder 40. The cylinder 40 and related members are arranged so as to be located in the space between the belts 30 wound around the two rollers 21 and 25 supported between both ends of the pair of supporting frames extending in parallel. .

The cylinder 40 is a single-acting air cylinder,
Air is supplied to the cylinder 40 by a pipe (not shown) so that the cylinder 40 can move forward and backward.

The supporting structure of the chain 50 is as follows. A support bracket 51 is provided at an intermediate portion of the drive unit frame 15.
Is fixedly mounted, and a holding member 52 is connected to the support bracket 51 via a tension bolt 52a. Holding member 5
A spring 52b is interposed between the two and the support bracket 51, and the tension bolt 52a is prevented from coming off by a double nut 52c.

A sprocket wheel 53 is rotatably supported by the holding member 52 via a pivot pin 53a.

A drum 55 having a one-way clutch mechanism incorporated therein
Is fitted to the transmission shaft 28 of the driving side roller 25,
The chain 50 is wound around the sprocket wheel 56 fixed to the drum 55 and the sprocket wheel 53 mounted on the holding member 52. A connecting plate 45a provided at the end of the moving member 45 connected to the operating rod 41 of the cylinder 40 is interposed or fixed to the middle portion of the chain 50.

The drum 55 has a diameter smaller than that of the roller 25, and the transmission shaft 28 integrated with the roller 25 is provided.
And a one-way clutch mechanism that transmits rotation in only one direction with the transmission shaft 28 is installed in the drum 55.

The adjusting block portions 60, 60 provided at the ends of the longitudinal frame portion 11 have an adjusting screw rotation preventing mechanism, the structure of which is shown in detail in FIGS.
That is, the adjustment block portions 60, 60 are provided with a long groove 61 into which the pivot shaft 21a of the roller 21 is slidably fitted in the tension direction. The head portion 62 of the block portions 60, 60 is inserted into the long groove 61, the screw shaft 69a of the adjusting screw 69 is inserted into the pivot shaft 21a of the roller 21, and is screwed into the adjusting nut 68 on the opposite side.

The screw shaft 69a indirectly adjusts the pivot shaft 21a in order to exert a screwing action on the pivot shaft 21a.
The head 62 is provided with a rotation stopping mechanism for the adjusting screw 69. That is, the adjustment block unit 6
On the head 62 of 0, a seat surface 63 having a size large enough to allow the screw head 69b of the adjusting screw 69 to be seated is formed to project, and a rotation stop plate 65 is provided.
Is relatively projected and retracted, and a rotation stop hole 65a is formed to prevent rotation when the screw head 69b of the adjusting screw 69 is fitted.

The detent plate 65 is biased by springs 64 and 64 to a stop position where the seat surface 63 is recessed from the detent hole 65a and the screw head 69b of the adjusting screw 69 fits into the detent hole 65a. Is held. The springs 64, 64 are the head 6
It is held in a holding hole 64a provided in No. 2. A holding portion 62a for preventing the rotation stop plate 65 from being disengaged by the urging force.
Are formed at the four corners of the head 62.

When the anti-rotation plate 65 is pressed against the head portion 62 of the adjustment block portion 60 against the biasing force of the springs 64, 64, the plate surface is lowered to the extent that the plate surface is continuous with the seat surface 63, and the adjustment screw 69 of the adjustment screw 69 moves. It is arranged so that the screw head 69b is opened.

Next, the operation will be described.

The support frame 10 is a drive unit frame 15
Can be standardized, and the length can be set to an appropriate length by changing the setting of the length of the longitudinal frame portion 11.
The tension of the belt 30 is appropriately adjusted by rotating the adjusting screw 69, and the tension of the chain 50 is also adjusted by the tension bolt 52a.

The belt tension is adjusted by adjusting the longitudinal frame portion 1.
The adjustment block portions 60, 60 provided at one end of the roller 21
Is moved in the longitudinal direction of the longitudinal frame portion 11, which is the direction of tension of the belt 30. In the adjusting block portion 60, the pivot 21a of the roller 21 is slidable in the tension direction in the long groove 61, and when the adjusting screw 69 screwed to the pivot 21a is rotated, the pivot 21a is driven by the screw action.
Is adjusted and moved, and the roller 21 moves in the longitudinal direction, so that the tension increases when the roller 21 moves away, and the tension decreases when the roller 21 approaches.

The adjusting screw 69 is held by a rotation preventing mechanism so as not to rotate at all times, and when the adjusting screw 69 is rotated, the rotation preventing mechanism is released to allow the adjustment screw 69 to rotate. That is, at all times, the rotation stop plate 65 is biased by the spring 64 and held and held by the holding portion 62a at a stop position floating above the seat surface 63 projectingly formed on the head 62 of the adjustment block portion 60. Therefore, the screw head 69b of the adjusting screw 69 fits into the rotation stop hole 65a of the rotation stop plate 65, and cannot rotate.

A box wrench B is suitable as a tool for making the rotation stopping plate 65 rotatable. That is,
When the box wrench B is fitted to the screw head 69b, the outer peripheral portion B1 at the tip of the box wrench B is in a state of pushing the rotation stop plate 65, and when it is pressed lightly, the rotation stop plate 65 resists the biasing force of the spring 64. The head surface 62 of the adjustment block portion 60 is pressed, and the plate surface is lowered so as to be continuous with the seat surface 63, and the screw head 69b of the adjustment screw 69 is pulled out from the rotation stop hole 65a and opened. Then, when the box wrench B is rotated,
The screw head 69b is rotated and the screw head 69b of the adjusting screw 69 is rotated.
Rotates to move relative to the adjusting nut 68, and the pivot 21a moves to adjust the position of the roller 21.

The rotation of the adjusting screw 69 is stopped, and the adjusting screw 69 is stopped.
When the box wrench B is removed from the screw head 69b of the
By the urging force of No. 4, the rotation stop plate 65 floats up to the stop position, and the rotation stop hole 65a is fitted into the screw head 69b of the adjustment screw 69, so that the adjustment screw 69 is prevented from rotating.

In short, the box wrench B is adjusted with the adjusting screw 69.
When the screw head 69b is engaged with the screw head 69b and pushed or released, the rotation is naturally stopped or opened, so that the operator can carry out the adjustment operation with almost no awareness.

When the air is sent to the cylinder portion 42 of the cylinder 40 by an air control mechanism (not shown) while the operation rod 41 is retracted, the operation rod 41 projects against the spring member built in the cylinder 40 to operate. The moving member 45 along with the rod 41 is also guided by the guide rod 44 and moves leftward in FIG.

When the moving member 45 moves leftward from the position shown in FIG. 4, the chain 50 is driven by the connecting plate 45a, and the leftward movement of the chain 50 causes the drum 55 to rotate via the sprocket wheel 56. Be moved. In this rotation, the one-way clutch mechanism transmits the motion,
The transmission shaft 28 is rotationally driven by the drum 55, and the belt 3
0 is sent.

When the belt 30 is fed by the set stroke and the operating rod 41 of the cylinder 40 projects to the position shown in the phantom line in FIG. 4, the air control mechanism stops the air supply and the air sent to the cylinder 40 Pulled out,
The operating rod 41 is retracted from the projecting position by the biasing force of the spring member built in the cylinder portion 42, the chain 50 is moved in the opposite direction, and the drum 55 is rotated in the opposite direction.

When the drum 55 rotates, the one-way clutch mechanism does not transmit the operation, the drum 55 idles with respect to the transmission shaft 28, and the driving side roller 25 is not rotationally driven.

When the operating rod 41 of the cylinder 40 retreats to the position indicated by the solid line in FIG.
The air is sent to the cylinder part 42 of 0, the operating rod 41 projects, and the belt 30 is sent as described above.

The belt 30 is intermittently fed by repeating the above operation.

In the above embodiment, the belt conveyer to which the belt is intermittently fed is provided with the tension adjusting mechanism, but this is merely an example, and in short, the present invention can be applied to any case where the belt tension is adjusted. Needless to say, can be applied.

[0042]

According to the tension adjusting mechanism of the belt conveyor of the present invention, the adjusting screw is normally prevented from rotating, and if necessary, the adjusting screw is released at a high speed by a simple series of operations to rotate the adjusting screw. You can adjust the tension of the belt,
After the adjustment, the adjusting screw is naturally prevented from rotating, so that the tension of the belt can be adjusted extremely easily, and the belt conveyer can be efficiently operated and can be efficiently set up in Tokyo.

[Brief description of drawings]

FIG. 1 is a perspective view of a tension adjusting mechanism according to an embodiment of the present invention.

FIG. 2 is a front view of an adjustment block portion of the tension adjusting mechanism according to the embodiment of the present invention.

FIG. 3 is a side view of an adjustment block portion of the tension adjusting mechanism according to the embodiment of the present invention.

FIG. 4 is a plan view of a belt conveyor including a tension adjusting mechanism according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Belt conveyor 10 ... Support frame 11 ... Longitudinal frame part 21, 25 ... Roller 28 ... Transmission shaft 30 ... Belt 40 ... Cylinder 41 ... Operating rod 50 ... Chain 55 ... Drum 60 ... Adjustment block part 61 ... Long groove 62 ... Head 63 ... Bearing surface 65 ... Anti-rotation plate 65a ... Anti-rotation hole 69 ... Adjusting screw 69a ... Screw shaft 69b ... Screw head

Claims (1)

[Claims] 1. A tension adjusting mechanism for a belt conveyor, comprising a belt wound around two rollers supported between both ends of a supporting frame having a pair of longitudinal frame portions extending in parallel, the end of the longitudinal frame portion. An adjustment block portion is provided in the adjustment block portion, and a long groove into which the pivot of the roller is slidably fitted in the tension direction is formed in the adjustment block portion, and an adjustment screw that is screwed into the pivot to adjust and move by a screw action is provided. The adjustment block is inserted through the head into the long groove, and the head is provided with a rotation stop mechanism for the adjustment screw, wherein the rotation stop mechanism is provided on the head of the adjustment block of the adjustment screw. A protrusion surface is formed that is large enough to allow the screw head to sit, and a rotation stop hole is formed to prevent rotation when the screw head of the adjusting screw fits and the seat surface is relatively projected and retracted. Keep the stop plate The anti-rotation plate is biased and held at a stop position where the seat surface is depressed and the screw head of the adjustment screw fits into the anti-rotation hole, and the anti-rotation plate is resisted against the biasing force. When the plate is pressed against the head of the adjustment block portion, the tension adjusting mechanism of the belt conveyor is arranged so that the plate surface is lowered to the extent that it is continuous with the seat surface and the screw head of the adjusting screw is opened. .