JP3205555U - Belt tension tension device - Google Patents

Abstract

The present invention provides a belt tension tension device capable of accurately managing belt tension without relying on the experience, skill level, and intuition of an operator in a belt conveyor. A slider 10 of a bearing 9 bearing a center shaft 8 of a tail pulley 1 is slidably engaged with a guide rail 7 provided on a lower side of a frame 4 on both sides of a tail pulley 1 of a belt conveyor A. A female screw 17 provided on the bearing 9 is screwed into a male screw 16 provided between both ends of the guide shaft 12 provided so as to be slidable, and a spring seat 19 provided on the protruding end of the guide shaft 12 so as to be movable forward and backward. And a belt tension tension device provided with a scale 25 for detecting the degree of compression of the coil spring 20 by interposing a rear end side of the frame 4 and the compression coil spring 20. [Selection] Figure 3

Description

  The present invention relates to a tension device with a spring for managing belt tension.

  In order to drive the belt conveyor, the friction force between the drive pulley and the conveyor belt can be used to rotate the drive pulley so that the conveyor belt, which has been stationary until now, travels and conveys the conveyed product. it can.

  The tension applied to the belt conveyor is different at the start of operation, during transportation, and during rest.

  In order to operate the conveyor, a belt is wound around the drive pulley and the necessary tension is not applied to the slack side, so that the necessary frictional force is not generated and the drive cannot be driven. And the belt continues to grow even though the degree varies with age.

  Therefore, in order to absorb the elongation of the belt due to driving or aging and to give the tension necessary for driving the driving unit, the belt is always provided with a tensioning device regardless of the shape.

  Tensioning devices are roughly classified into a method of pulling a belt using a weight or a carriage by gravity or a winch, and a push-pull method using a screw screw or a cylinder.

  In the case of a relatively long conveyor with a weight tension device, it is possible to absorb fluctuations in belt tension inside the belt being used. For example, when the pulley of the weight portion moves up and down while absorbing the belt main body, it is possible to reduce the overload applied to the pulleys at various places while applying a predetermined tension to the drive pulley.

  However, in the short length conveyor, it is very difficult to absorb these belt tension fluctuations due to the structure, and the abnormal overload generated in the drive pulley is transmitted to the entire conveyor instantly through the conveyor belt in a short time. In particular, a pulley or the like having a tensioning device is subjected to a great overload, which may cause a worst accident.

  If an operation method for starting the belt conveyor suddenly is used, an abnormal tension is generated in the conveyor belt, and as a result, the associated pulleys and frame structure are overloaded.

Therefore, the belt tension applied to the pulley of the belt conveyor using the existing screw type tensioning device (stretcher) which is adopted by many short-length belt conveyors is a bearing on which the sliders attached to both sides of the pulley can move. Further, the shaft for guiding the bearing is supported by a stretcher that can be held on both sides.
The bearing is tensioned by a spring (Patent Documents 1 and 2).

No. 06-30743 JP-A-11-165830

  By the way, according to the methods of Patent Documents 1 and 2, the belt tension applied to the pulley is supported by a slide-movable bearing that holds both sides of the pulley, and the guide shaft that guides the bearing is held by the frame on both sides. It is a structure.

  In the tension device pulley having such a structure, the left and right bearing positions are accurate and equal, and the conveyor belt is likely to meander unless the right and left bearings are always perpendicular to the conveyor axis. It has the feature that the meandering of the belt can be corrected by adjusting.

  However, especially in the non-drive pulley (usually tail take-up pulley), the above-mentioned rapid operation is performed while absorbing the belt elongation and giving the belt elasticity necessary to generate friction in the drive pulley. A tensioning device intended to absorb the impact load that is sometimes applied is a known technique, but as described above, the conveyor belt is in the direction of extending with the passage of the secular time, and as a result, the belt management set at the initial stage is difficult. This is the current situation.

  Originally, this type of bearing is a non-fixed type that can move left and right separately without connecting the left and right bearings, so the position of the bearing has the disadvantage of being unstable with respect to the direction of belt travel, so the belt is strained This is due to the fact that the left and right belt tensions are often not managed accurately, such as variations that occur when the work to be performed is manual and often depends on the experience, skill, and intuition of the operator.

That is, it is because the tension force of the used spring that individually tensions the left and right bearings (via the spring) cannot be managed.
Therefore, the present invention is to provide a belt tension tension device that solves the above-mentioned problems.

  In order to solve the above-mentioned problems, the present invention provides a stationary frame on both sides of a tail pulley in a belt conveyor, and a guide rail parallel to the belt side edge of the belt conveyor on the lower side of the frame. A slider provided below the bearing that supports the center shaft of the tail pulley is slidably engaged, and both ends of the guide shaft are slidably passed through the upper and lower ends of the belt in the longitudinal direction of the belt. A stopper is provided at the tip of the guide shaft in the belt running direction, a female screw provided above the bearing is screwed into a male screw provided between both ends of the guide shaft, and the guide shaft is removed from the frame. A spring seat that moves forward and backward by a reversible rotation operation is provided at the rearward projecting end. And it is brought into contact with both ends and the rear end side of the frame by interposing a compression coil spring, to protrude rearward from the frame adopting a structure in which a scale for detecting the degree of compression of the coil spring.

  As described above, according to the belt tension tension device of the present invention, the external pressure of the belt tension acts on the head pulley due to the tension of the belt.

  As a result, the bearing slides forward together with the head pulley by being guided by the guide rail and the slider, so the guide shafts on both sides slide in the same direction with the male screw and female screw, and the coil springs on both sides are further compressed along with this sliding. And trying to push the bearing back.

  As a result, the tension of the belt and the repulsive force due to the compression of the coil spring are balanced. That is, it is based on the principle that the belt tension value is equal to the force applied to the coil spring and the fact that the belt tension can be determined from the amount of spring compression by applying a known spring constant.

  Then, the reciprocating rotation operation of the rear end rotation shaft of the guide shaft moves the spring seat forward and backward to operate the compression of the coil spring to adjust the repulsive force by the coil spring, and the movement position of the seat according to the adjustment is adjusted. By detecting with the scale, the degree of compression of the coil spring can be known very easily.

  For this reason, the belt tension can be numerically managed on a scale unlike visual inspection, that is, it can be managed only by rotating the guide shaft, and anyone can easily manage the belt tension without requiring skill or experience. There is a special effect that can be.

It is a side view which shows embodiment of this invention. It is a top view same as the above. It is a vertical expansion side view which shows the principal part same as the above. It is the same enlarged rear view. It is the longitudinal cross-sectional enlarged rear view.

Next, an embodiment of the invention will be described with reference to the accompanying drawings.
A shown in FIGS. 1 to 3 is a belt conveyor.

  As is well known, the belt conveyor A is constructed by spanning an endless belt a between front and rear head pulleys (not shown) and the tail pulley 1, and as shown, the carrier-side belt a The trough-type carrier roller 2 shown in the figure is arranged in the front and rear, and the return side belt a is supported by the return roller 3 arranged in the front and rear.

In addition, stationary frames 4 and 4 are provided on both sides of the tail pulley 1.
As shown in FIGS. 1 to 3, the frame 4 is constructed by assembling the upper and lower and front and rear frame members 5 into a square shape, and the lower side of the frame 4 is attached to the left and right installation seats 6 with the fastening bracket 11. It is fixed and fixed.

  Further, a guide rail 7 parallel to the side edge of the belt a is provided below the frames 4 (lower frame member 5), and the guide rails 7 support the center shaft 8 of the tail pulley 1 below the left and right bearings 9 below. A slider 10 provided at the front and rear is slidably engaged.

  In the illustrated case, the slider 10 is configured such that a groove-shaped frame member 5 on the lower side serves as a guide rail 7 and groove-shaped end members fitted on the guide rail 7 from above are provided on the lower and front sides of the bearing 9.

  Further, both ends of the guide shaft 12 are slidably passed through the front and rear ends of the upper sides of the frames 4 and 4, and a plate stopper 13 is provided at the front end of the guide shaft 12 in the running direction of the belt a.

  In the illustrated case, the stopper 13 is constituted by a tip screw portion 14 of the guide shaft 12 and a nut 15 screwed into the screw portion 14, but is not limited thereto.

  Further, female screws 17 at the front and rear of the bearing 9 are screwed into male screws 16 provided between both ends of the guide shaft 12.

  Further, the center of the spring receiving seat 19 is fitted to the projecting shaft 18 continuous from the end of the guide shaft 12, one end of the coil spring 20 fitted to the projecting shaft 18 is attached to the spring receiving seat 19, and the other end is framed. 4 abuts against a receiving seat 21 that is located on the rear surface side and is fitted to the protruding shaft 18.

  Then, the tension of the belt a and the repulsive force due to the compression of the coil spring 20 are balanced. In other words, it can be visualized that the belt tension can be determined on the contrary from the principle that the tension value of the belt a is equal to the force applied to the coil spring 20 and the amount of spring compression applying a known spring constant.

The coil spring 20 may be brought into contact with the rear side member of the frame 4 instead of the seat 21.
The positioning of the spring seat 19 is stopped by screwing a nut 23 into a screw portion 22 provided inward from the end of the protruding shaft 18.

  The degree of compression of the coil spring 20 can be adjusted by the spring seat 19 that moves forward and backward by engaging the handle 24 with the protruding end of the protruding shaft 18 and rotating the guide shaft 12.

  At this time, a scale 25 protruding rearward from the frame 4 is provided, and the degree of compression of the coil spring 20 is determined by a scale (scale mark, not shown) that indicates the scale of the scale 25 and the position of the collar of the spring seat 19. It is possible to know, and by knowing this, it is possible to visually check whether the coil spring 20 is contracted or extended, and numerical management can be performed.

For this reason, since the management becomes easy, anyone can easily manage the belt tension without requiring skill or experience.
In the figure, reference numeral 26 denotes a mounting bracket for the scale 25.

  Necessary tension is applied to the belt a by sliding of the bearing 9 having the female screw 17 screwed into the male screw 16 of the guide shaft 12 by the rotation of the guide shaft 12 using the handle 24.

  Then, the coil spring 20 is compressed by the amount of tension applied to the belt a while the tail pulley 1 moves.

  If the tension required by the belt conveyor A is 5000 kg based on the spring constant according to the specifications of the coil spring 20, the position of the pointer (not shown) that moves simultaneously with the expansion and contraction of the coil spring 20 and the value of the scale 25 at that time For example, if a mark 27 is engraved in advance on the scale 25 and a pointer is placed at the position of this mark 27, the necessary belt tension is inevitably obtained.

With the above configuration, when the belt conveyor A is operated or a large tension is applied to the belt a for some reason, the tail pulley 1 is slid forward while the bearing 9 is slid by the guide rail 7, and the movement according to the sliding is performed. The coil spring 20 is compressed by the guide shaft 12 that performs.
On the other hand, the tail pulley 1 is pushed back by the repulsive force of the compressed coil spring 20.

  With the above configuration, when a large tension is applied to the belt a due to the start of operation of the belt conveyor A or for some reason, the tail pulley 1 moves forward together with the bearing 9 while the slider 10 slides on the guide rail 7 due to the tension. Moving.

  As the slide slides, the guide shaft 12 having the male screw 16 screwed into the female screw 17 also slides, so that the coil spring 20 is compressed by the spring seat 19 that moves together, and the bearing is interposed via the guide shaft 12 by the repulsive force accompanying the compression. 19 tries to push back the tail pulley 1 together.

A Belt conveyor a Belt 1 Tail pulley 2 Carrier roller 3 Return roller 4 Frame 5 Frame material 6 Mounting seat 7 Guide rail 8 Center shaft 9 Bearing 10 Slider 11 Fastener 12 Guide shaft 13 Stopper 14 Screw part 15 Nut 16 Male thread 17 Female Screw 18 Projection shaft 19 Spring seat 20 Coil spring 21 Seat 22 Screw portion 23 Nut 24 Handle 25 Scale 27 Mark

Claims (1)

  A stationary frame is provided on both sides of the tail pulley in the belt conveyor, and a guide rail parallel to the belt side edge of the belt conveyor is provided on the lower side of the frame, and the guide rail is provided below the bearing that supports the center shaft of the tail pulley. A slider provided is slidably engaged, and both ends of the guide shaft are slidably passed through the upper and lower ends of the belt on the upper side of the frame, and a stopper is provided at the tip of the guide shaft in the belt running direction. The female screw provided above the bearing is screwed into the male screw provided between both end portions of the guide shaft, and the guide shaft is protruded from the frame to the rearward projecting end portion by reversible rotation operation. A moving spring seat is provided, and both ends abut against this spring seat and the rear end of the frame. Interposing a compression coil spring Te, to protrude rearward from the frame belt tension tensioning device, characterized in that a scale for detecting the degree of compression of the coil spring.

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