JP2522670B2 - Belt conveyor scraper device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scraper device for a belt conveyor.

(Prior Art) Depending on the type of a conveyed product carried by a belt conveyor, a part thereof may adhere to the conveyor belt, and a scraper device may be attached to the belt conveyor to remove it.

Conventionally, a scraper device includes a pair of opposing arm members having one end pivotally mounted to a support frame that rotatably supports a pair of pulleys around which the conveyor belt that defines forward and return paths. A blade is fixed to the other ends of both arm members, and the blade extends across the conveyor belt and faces the return path.

Both ends of a pair of spring members, which are biasing force imparting means, are connected to the support frame and the arm member, and the spring members exert a spring biasing force on the arm member in one swinging direction. Therefore, the blades supported by both arm members come into contact with the return path of the conveyor belt and exert a shearing force on it. Therefore, the adhering matter that moves with respect to the blade hits the blade and is scraped from the return path. The contact angle of the blade with respect to the return path of the conveyor belt is usually preset to a value that provides the best scraping effect.

By the way, the conveyor belt expands and contracts according to a change in the weight of a conveyed product, a change in a tension given in advance to give tension to the conveyor, and also extends during use.
The blade that abuts the conveyor belt swings together with the arm member according to expansion and contraction of the conveyor belt. However, the swinging motion of the blade is accompanied by a change in the attitude of the blade with respect to the conveyor belt. For this reason, there is a problem in that the size of the contact angle of the blade with respect to the conveyor belt is greatly changed, and the scraping effect is reduced.

(Object of the Invention) An object of the present invention is to minimize the change in the contact angle of the blade of the scraper with respect to the conveyor belt as the conveyor belt expands and contracts.

(Structure of the Invention) The present invention is basically such that the blade that comes into contact with the return path of the conveyor belt and gives a shearing force thereto is supported by a parallelogram parallel crank mechanism, that is, is fixed to the support frame of the belt conveyor. The parallel crank mechanism is fixed to the connecting link opposite to the fixed link, and the biasing force imparting means applies a biasing force to the parallel crank mechanism, whereby the blade comes into contact with the return path of the conveyor belt. It is characterized by

The present invention is further characterized in that a second parallel crank mechanism that cooperates with the first parallel crank mechanism and a second blade supported by the mechanism are provided.

(Operation and Effect of the Invention) According to the present invention, when the conveyor belt expands or contracts, the blade under the action of the biasing force applying means swings together with the connecting link following the expansion or contraction of the conveyor belt. However, since the connecting link forms a part of the parallel crank mechanism, the blade maintains its posture during rocking. Therefore, the blade does not change the contact angle with the conveyor belt due to the swing of itself, and therefore, the change in the contact angle can be suppressed to the minimum. As a result, it is possible to maintain the preset contact angle to be substantially the same in order to obtain the best scraping effect.

Further, according to the present invention, the second blade also does not change its posture during the swing for the same reason as described above. From this, the two blades are maintained at the best contact angle with respect to the conveyor belt, so that a higher scraping effect can be obtained.

(Embodiment) The features of the present invention will be further clarified by the following description of the illustrated embodiment.

Referring to FIG. 1, the scraper 10 according to the present invention is
Coal, earth and sand, sand, gravel, crushed stone, grain,
It is installed on a belt conveyor 12 that is used to convey a conveyed product such as ready-mixed concrete.

The belt conveyor 12 includes a support frame 14 (however, a part thereof is shown by hatching), a pair of pulleys 16 (only one of which is shown) rotatably supported at both ends of the support frame. An endless conveyor belt 18 that goes around the pulley and defines a forward path 18a and a return path 18b. The conveyor belt 18 is driven in the direction indicated by the arrow by one pulley 16 which is rotated by receiving rotational power from a driving means such as a motor (not shown). Therefore, the conveyed object placed on the outward path 18a moves to the right in the figure, and then,
It falls from the right end.

In particular, when the transported material is earth and sand having high viscosity or ready-mixed concrete, a part of it adheres and remains on the outward path 18a. The scraper 10 device according to the present invention changes from the forward path 18a to the return path 18b around the pulley 16 and removes the deposits from the return path that moves leftward in the drawing.

The scraper device 10 includes a pair of parallel crank mechanisms 20,
A blade 22 supported by the mechanism and a pair of spring members 24 are provided.

Each parallel crank mechanism 20 has four links 26 to 32 that extend in parallel with the rotation axis of the pulley 16 and are rotatably connected about mutually parallel axes, and four links 26 connect the connection points of the links. A straight line forms a parallelogram. In the illustrated example, each link comprises an elongated plate member.

Both parallel crank mechanisms 20 are arranged on both sides of the belt conveyor 12 so as to face each other, and one of the links 26 of each parallel crank mechanism 20 is fixed to the support frame 14 as a fixed link.

The blade 22 is held by a holder 31 in the illustrated example, and the fixed link 26 of the parallel crank mechanism 20 is held through the holder 31.
It is fixed to a connecting link 28 that forms a pair with and is opposed to it, and is thereby supported by the parallel crank mechanism. Blade 22
Comprises an elongated rigid plate member having a length dimension approximately equal to the width dimension of the conveyor belt 18, extending across the conveyor belt 18 and facing the return path 18b of the belt.

Each spring member 24 is fixed link 26 of each parallel crank mechanism 20.
The coil springs extend in the vertical direction in parallel with, and both ends thereof are connected to the support frame 14 and the upper link 30 which is one of the other pairs of links of each parallel crank mechanism 20.

The spring member 24 constitutes a biasing force applying means for exerting a biasing force on the blade 22 toward the return path 18b of the conveyor belt via the link 30. In response to the spring biasing force of this spring member 24,
The blade 22 abuts the return path 18b of the conveyor belt and exerts a shearing force on the return path. For this reason, the adhering matter that adheres to the return path 18b and moves leftward in the drawing together with the return path 18 strikes the blade 22 and is scraped off from the return path 18b. The other end of the spring member 24 having one end fixed to the support frame 14 can be fixed to the link 28 or the link 32 instead of the illustrated example. As another example of the biasing force applying means, a hydraulic or pneumatic cylinder, a lever mechanism for converting gravity of a weight into an upward force, or the like can be applied.

Further, the conveyor belt expands and contracts due to changes in the amount of the conveyed articles dropped on the outward path 18a, changes in the tension applied to the conveyor belt 18, and the like. Since the blade 22 of the scraper 10 device is subjected to the spring biasing force toward the conveyor belt 18 as described above, the blade 22 swings together with the connecting link 28 following the expansion and contraction of the conveyor belt 18. And is kept in contact with the conveyor belt 18. blade
The fact that 22 is kept in contact with the conveyor belt 18 is the same as when the conveyor belt 18 is stretched due to long-term use. The pair of parallel links 30 and 32 can be set to have smaller length dimensions. According to this, the overall size of the scraper device 10 can be reduced, and the swing radius of the blade 22 can be further reduced, so that the scraper device 10 can be installed in a narrow space. Becomes

When the blade 22 swings together with the connecting link 28, the parallel crank mechanism 20 supporting the blade 22 has a parallelogram shape, and therefore, as shown by an imaginary line in FIG. It displaces in the direction but does not change its posture.

In the illustrated example in which the fixed link 26 is located in front of the blade 22 with respect to the moving direction of the return path 18b of the conveyor belt, the blade 22
The contact angle θ with respect to the return path 18b is preferably set to a value slightly smaller than 90 degrees. This setting is
This is done by changing the mounting angle of the blade 22 with respect to the connecting link 28. When set to such an angle,
Since the blade 22 is directed in the direction opposite to the moving direction of the return path 18b, the effect of scraping the adhering matter by the blade 22 is enhanced. Further, since the posture of the blade 22 is maintained, the wear shape of the blade 22 is kept substantially constant. The contact angle varies depending on the type of the conveyed product, and if the value of the angle is set to be too small, the scraping effect is enhanced, but the degree to which the return path 18b is damaged is also increased.

According to this scraper device 10, since the attitude of the blade 22 does not change, even if the conveyor belt 18 expands, the predetermined optimum contact angle θ is substantially maintained (see FIG. 1). ).

Instead of the illustrated example, the fixed link 26 is replaced by the return path 18
It can be arranged behind the blade 22 with respect to the direction of movement of b. However, compared with the illustrated example, when the blade hits the deposit, the blade swings against the spring biasing force, and the conveyor belt 18
The spring bias force must be set to a larger value because it is easier to move away from.

Further, as shown in FIG. 2 and FIG. 3, a pair of second parallel crank mechanisms 34 is provided, which is formed by the pair of parallel crank mechanisms 20 serving as a first parallel crank mechanism in cooperation therewith. A second blade 36 can be provided with the blade 22 as the first blade.

In the example shown in FIG. 2, each second parallel crank mechanism 34
Is composed of a pair of parallel links 38 connected to the connection link 28 of the first parallel crank mechanism 20, and a connection link 40 connected to the parallel link 38 in parallel with the connection link 28.
The second blade 36 is fixed to the pair of connecting links 40 and extends in parallel with the first blade 22 at a distance. One of the parallel links 38, that is, the upper link, is biased by a spring member 42 formed of a coil spring having both ends connected to the link and the support member 14. As a result, the first and second blades 22 and 36 are pressed against the return path 18b of the conveyor belt 18. Instead of the spring member 42, which is the biasing force imparting means, the above-described cylinder and lever mechanism can be used.

According to this example, when the conveyor belt 18 expands and contracts, the first and second blades 22 and 36 swing together with the connecting links 28 and 40 without changing their postures, so that the first and second blades 22 and 36 are brought into contact with the return path 18. Maintained. Therefore, as the backward path 18b of the conveyor belt advances in the direction indicated by the arrow, the deposits are sequentially scraped off by the two blades 36 and 22 that maintain the best contact angle, thereby substantially removing the deposits. Can be completely removed.

Also, the example shown in FIG.
2 is different from the example shown in FIG. 2 in that the pair of parallel links 38 are connected to the pair of parallel links 30 and 32 of each first parallel crank mechanism 20. In this example, a pair of spring members 24, 4 is provided for the first and second parallel crank mechanisms on each side.
The upper links 30 and 38 are subjected to a spring biasing force by 2, so that the blades 22 and 36 are pressed against the return path 18b of the conveyor belt. Also in this example, the double blades 22 and 36 are kept in contact with the return path 18b without changing their postures even if the conveyor belt 18 expands and contracts.

The spring member 34 shown in FIGS. 2 and 3 is an upper link.
It can be attached with respect to the lower link 38 or the connecting link 40 other than 38, and the spring member 24 shown in FIG. 3 can be attached to the link 28 or the link 32 other than the link 30. Further, the number of the spring members may be increased if necessary, and conversely, the attachment of the spring members may be omitted for the parallel crank mechanism on either side.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevation view of a scraper according to the present invention, and FIGS. 2 and 3 are elevation views of a scraper device according to another example of the present invention. 10: Scraper device, 12: Belt conveyor, 14: Support frame, 16: Pulley, 18: Conveyor belt, 18a, 18b: Forward and return of conveyor belt, 20,34: Parallel crank mechanism, 22,36: Blade, 24 , 42: spring members (biasing force applying means), 26: fixed links, 28, 40: connecting links.

Claims (2)

(57) [Claims] 1. A scraper device for a belt conveyor, comprising: a support frame; a pair of pulleys rotatably supported by the support frame; and a conveyor belt that surrounds the pulleys and defines a forward path and a return path. A pair of parallel crank mechanisms having fixed links fixed to the support frame and facing each other, and fixed to connecting links parallel to the fixed links of each parallel crank mechanism, extending parallel to the conveyor belt and extending across the conveyor belt. A scraper device comprising: a blade facing a return path of a belt; and means for applying a biasing force to the parallel crank mechanism so that the blade contacts the return path of the conveyor belt. 2. A scraper device for a belt conveyor, comprising: a support frame; a pair of pulleys rotatably supported by the support frame; and a conveyor belt that surrounds the pulleys and defines forward and backward paths. A pair of first parallel crank mechanisms having fixed links fixed to the support frame and facing each other, and fixed to connecting links parallel to the fixed links of each first parallel crank mechanism,
A first blade extending across the conveyor belt and facing a return path of the conveyor belt; a second parallel crank mechanism cooperating with each first parallel crank mechanism; and the first parallel crank. A second parallel blade parallel to the first blade fixed to the second parallel crank mechanism connecting link parallel to the connecting link of the mechanism; and first and second blades in the return path of the conveyor belt. Means for applying a biasing force to the first and second parallel crank mechanisms such that they abut.