JPS62136414A - Speed control device for chain conveyer - Google Patents

Abstract

PURPOSE:To make it possible to rotate conveying rollers in both normal and revere directions, by fitting a conveying roller which is steppedly formed therein with large and small diameter sections, rotatably onto each of shafts disposed between conveying chains, and by arranging an elevating member from which contact plates that may make into contact with the upper and lower surfaces of the small diameter sections of the roller are projected. CONSTITUTION:Conveyer rollers 7 each having small and large diameter sections 6, 5 are journalled onto support shafts 3 which are arranged between right and left conveying chains at predetermined intervals. Contact plates 22 which may make into contact with the upper parts of the small diameter sections 6 and contact plates 25 which may make into contact with the lower parts of the small diameter sections 6 are provided in an box-like elevating member journalled to an elevating cylinder 30, and are arranged to be spaced from each other with a slight distance. When the elevating cylinders 30, 32 make the lower contact plates 25 in contact with a roller, the roller is rotated in the same direction as the drive direction of the chains while when the upper contact plates 22 are made into contact with the roller, the roller is rotated in the direction reverse to the drive direction of the chains, while at a neutral position the roller does not rotate but the roller is moved at the same speed as that of the chains, and therefore, an article to be conveyed on the large diameter section 5 may be conveyed at various speed and may be conveyed in both normal and reverse directions.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a chain conveyor that carries articles by placing them on the linear running section of a circulating conveyance chain, while the conveyance chain is running at a predetermined speed. It is possible to transport the article at a speed higher than the running speed of the conveyor chain or in the direction opposite to the running direction of the conveyor chain, and it is also possible to stop the article by hitting a stopper while the conveyor chain is running. Regarding chain conveyors.

Problems to be solved by conventional techniques and inventions
As described in Japanese Patent No. 8-46406, a conveyance roller of a larger diameter is fitted onto a chain roller fitted on a chain shaft, and the chain roller is moved by the load of the conveyed object placed on the conveyance chain. A chain conveyor is known in which a chain roller is driven to rotate as the chain advances by being pressed against a rail, and the conveying roller is rotated by friction with the chain roller to obtain a conveying speed higher than the chain speed. However, in such a chain conveyor, the conveyance speed of the article can be increased but cannot be decreased relative to the running speed of the chain, and the conveyance speed of the article can be adjusted to a specific position on the conveyor. It was not possible to make arbitrary changes.

Means for Solving the Problems The present invention, as a means for solving the above-mentioned problems, consists of a pair of left and right conveyance chains that are parallel to each other and whose upper horizontal running section is the conveyance section, and which are passed at a constant interval. Conveyance rollers having a large diameter portion and a small diameter portion concentrically stepped are fitted onto a large number of support shafts so as to freely rotate, and are placed outside the conveyance portion of one of the conveyance chains.

An elevating body is disposed that passes above and below the fiA conveyance chain and has an upper contact plate and a lower contact plate protruding so that its tip can contact the upper and lower surfaces of the small diameter portion of the conveyance roller, and the elevating body is , from a neutral position where the upper and lower contact plates are spaced apart from the small diameter portion of the transport roller to an upper position where the lower contact plate contacts the lower surface of the small diameter portion of the transport roller; A drive device is provided at a lower position in contact with the two surfaces of the small diameter portion to raise and lower it.

action A speed control device for a chain conveyor according to the present invention.

With the above configuration, when the elevating body is in the neutral position, the small diameter portion of the conveyance roller does not touch either the upper or lower contact plate and the conveyance roller does not rotate.

The article placed on the conveyance roller can be conveyed at the same speed as the conveyance chain, and when the elevating body is raised to an upper position by the drive device and the lower contact plate is brought into contact with the lower surface of the small diameter portion of the conveyance roller, the small diameter The conveyor roller rotates as the part rolls on the lower contact plate, which allows the article to be conveyed at a higher speed than the conveyor chain at a constant acceleration rate determined by the diameter ratio of the small diameter part and the large diameter part. In addition, when the elevating body is lowered to the lower position by the drive device and the upper contact plate is brought into contact with the upper surface of the small diameter portion of the conveyance roller, the small diameter portion touches and rotates the upper contact plate, causing the conveyance roller to move in the opposite direction. This allows the article to be transported in the direction opposite to the running direction of the conveyor chain at a constant speed determined by the diameter ratio of the small diameter part and the large diameter part, and the elevating body can be moved to the neutral position, upper position, and lower position. By driving up and down, it is possible to change the conveyance speed and conveyance direction of the article traveling above the elevating body.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings.

In Fig. 1, ■ is a conveyor frame arranged horizontally, and a large number of roller links and pin links are alternately connected between sprockets supported at both front and rear ends (not shown) of the conveyor frame 1. Two endless conveyor chains 2゜2 are passed parallel to each other, and these two conveyor chains 2゜2 are connected to a large number of conveyor chains 2゜2 that are passed between them at regular intervals. Conveying rollers 7 are connected to each other by support shafts 3, and each support shaft 3 has a central large-diameter portion 5 that supports an article, and a small-diameter portion 6 is integrally formed on both sides of the central large-diameter portion 5. The upper linear running portion of the one-car conveyor chain 2 is supported on the left and right rails 10110 horizontally disposed on the conveyor frame 1 via support members, respectively. , the lower straight running section is supported by left and right rails 11.11''-, respectively, which project from the conveyor frame. On the side surface of the conveyor frame 1, two supporting plates 12 and 12 are arranged parallel to each other and are fixed to the outer surface of the conveyor frame 1, so that they are spaced at regular intervals in the length direction of the conveyor frame l. Between each set of support plates 12.12, there is an elevating body 15 having a cylindrical shape with a rectangular cross section surrounding the upper linear running portion of both conveying chains 2.2. It is arranged horizontally with a gap between the side and both supporting slopes 12 and 12 respectively.

One end side of each of a total of four links 16, two of which are disposed in each gap on both sides, is pivotally supported on the outer surface of the elevating body I5 by a pin [7], and the other end side of each link 16 is supported by a pin [7].
is pivotally supported inside the support plate 12 to constitute a parallel link mechanism, whereby the descending body 15 is supported on the support plate L2.12 to freely move up and down while maintaining a horizontal posture, and the elevating body 15 Surin 1-21 is installed in the center of the top plate 20.
is formed over both front and rear ends, and the large diameter portion 5 of the conveyor roller protrudes upward from this sulin 1-21, and elongated upper contact plates 22 made of synthetic resin are provided on the lower surfaces of both sides of the slit 21 of the top plate 20, respectively. The upper surface plate is fixed by adhesive over the entire length of the upper surface plate 23 corresponding to the upper side of the small diameter portion 6 of the transport roller luff, while the small diameter portions 6, 6 on both sides of the transport roller ruff are fixed on the inside of the upper surface plate 23 of the elevating body 15. Two horizontal rails 24 corresponding to each other are protruded downward in parallel to each other, and a lower contact plate 25 made of synthetic resin similar to that described above is fixed to the upper surface of each horizontal rail 24 by adhesive. The corresponding interval between the contact plate 25 and the above-mentioned upper contact plate 22 is larger than the outer diameter of the small diameter portion 6 of the conveying roller rough.

Connecting shafts 26 projecting outward are fixed to the upper portions of both sides of the elevating body 15 near the center, and connecting shafts 27 corresponding to the lower positions of these connecting shafts 26 are respectively attached to the side surfaces of the support plate 12. Air cylinders 28 are installed between these connecting shafts 26 and 27, respectively, and as shown in FIG.
b is fitted, and a partition wall 32 is formed in the center to define two air chambers above and below, and a piston 33 is fitted into each air chamber.

The tip of the piston rod 35a fixed to the upper surface of the upper screw 1-33 protrudes upward from the rod cover 31a, and the tip of the screw 1-hen rod 35b fixed to the lower surface of the lower piston 33 extends from the lower 1 to The piston rods 35a and 35b protrude downward from the cover 31b, and each piston rod 35a, 35b can be moved forward and backward individually, and the tip of the upper piston rod 35a is connected to the elevating body 1 by a connecting portion 36
It is axially connected to the end of the connecting shaft 26 of No. 5, and the lower screw! - The tip of the connecting rod 1-35b is axially connected to the end of the connecting shaft 27 of the support plate 12 by the connecting part 37, and as shown by the solid line in the figure, the upper piston rod of the left and right air cylinders 28 is always connected. 35a is retracted, the lower screw 1 rod 35b is protruding, and the elevating body 15 is in a neutral state in which both its upper and lower contact plates 22.25 are separated from the circumferential surface of the small diameter portion 6 of the conveying roller 7. position, and in this state, as shown by the chain lines in Figure 1, the left and right air cylinders 2
When the screw 1-rod 35a on the upper side of 8 is protruded, the elevating body 15 rises, and the lower contact plates 25 and 25 move to the small diameter portions 6, 6 on both sides of the conveyor roller rough.
When the lower piston rod 35b is moved back, the cylinder tube 30 is relatively lowered, and the elevating body 15 is lowered accordingly, so that the upper contact plates 22 and 22 are connected to the respective conveyor rollers. It comes into contact with two surfaces of the small diameter portion 6.6 of No.7. Conveyance chain 2.
The rails 1O1 each support the upper straight running section of 2.
The height of the upper surface of the IO is slightly higher at the portion that penetrates the inside of each elevating body 15.

Next, the operation of this embodiment will be explained.

In the conveyor configured as described above, by rotationally driving the sprocket at the end of the conveyor frame l, the straight running portions on the two sides of both conveyor chains 2.2 are moved to the rail 1.
0 and circulates in one direction, and as a result, each conveyance roller 7 in the linear traveling section moves horizontally. When passing through the interior, as mentioned above, the upper surface of the upper rail 10.10 inside the elevating body 15 is about 1 yen high, so by stepping on it and lifting it, it will move up a little. The height of the upper surface of the central large-diameter portion 5 that supports the article is made slightly higher, and as shown by the solid line in FIG. The small diameter portions 6, 6 of the feed roller 7 are connected to the upper and lower contact plates 22.2.
When the lower contact plate 25 is brought into contact with the small diameter part 6 by holding the elevating body 15 in the two-way position by driving the left and right air cylinders 28, the small diameter part 6 is brought into contact with the small diameter part 6. .6 rotates, the large diameter portion 7 rotates in the same direction as the traveling direction of the conveyor chain 2, and the left and right air cylinders 28 are driven to hold the elevating body 15 in the lower position and lower the lower contact plate. When the conveyor 22 is brought into contact with the small diameter part 6, the large diameter part 7 is rotated by the drive shaft of the small diameter part 6 in the opposite direction. Two elevating bodies 1 arranged side by side and adjacent in the length direction
5. When an article whose longitudinal length is sufficiently large relative to the separation distance L5 is placed between the upper surfaces of both conveyors, the lower surface of the article passes through the inside of each elevating body 15 on the upper surface of the large diameter portion 5 of the conveying roller 7. Therefore, it will be supported only by the.

When each elevating body 15 of both conveyors is held in an upper position by driving each air cylinder 28, each conveying roller 7 passing inside each elevating body 15 is driven by the lower contact plate 25 of the small diameter portion 6 and moves the conveying chain 2. Since each article rotates in the same direction as the traveling direction of the conveyor chain 2, each article is transported at a high conveying speed that is increased by a constant acceleration rate determined by the diameter ratio of the small diameter portion 6 and the large diameter portion 5 relative to the traveling speed of the conveying chain 2. When each elevating body is conveyed and held in a lower position by driving each air cylinder 28, each conveying roller 7 passing inside each elevating body 15 is driven by the upper contact plate 22 of the small diameter portion 6 to form a conveying chain. By rotating in the direction opposite to the running direction of the conveyor chain 2, each article is transported backwards in the opposite direction to the running direction of the conveyor chain 2 at a constant speed determined by the diameter ratio of the small diameter part 6 and the large diameter part 5, and each elevating body 15 in the neutral position, each conveyance roller 7 does not rotate, so each article is conveyed at the same speed as the conveyance chain 2.

Note that the diameters of the small diameter portion 6 and large diameter portion 5 of the conveyance roller 7 are respectively set to t1. D, and the wI feed chain 2 is set to πd at the 1st time.
When the small diameter portion 6 drives the contact plate 22.25, the circumferential speed of the small diameter portion 6 is πd.
On the other hand, since the peripheral speed of the large diameter portion 5 is πD,
The actual moving speed of the large diameter portion 5 is
When the small diameter portion 6 drives the upper contact plate 22, it becomes πd + πD, and in this embodiment, the diameter of the large diameter portion 5 is Since it is twice the size of the small diameter part 6, the small diameter part 6 is the lower contact plate 25.
When driving the shaft, the conveyance speed of the article is πd+πD=3πd
Therefore, it is three times that of the conveyor chain 2, and on the other hand, the small diameter part 6
When driving the upper contact plate 22, πd−πD=−πd
Thus, the article is transported in the opposite direction at the same speed as the transport chain 2.

Also, by controlling the operating force of the air cylinder 28 by adjusting the air pressure, the upper and lower contact plates 22, 2
If the elevating body 15 is driven up and down so that the small diameter portion 6 of the conveyor roller 5 and the small diameter portion 6 of the conveyor roller rough come in contact with each other to some extent, it is possible to set the accelerating speed and the reverse feeding speed to intermediate values. be.

As clarified by the detailed description of the invention, according to the speed control device of the present invention, by driving the elevating object up and down to the neutral position, the lower position, and the lower position, it is possible to control the speed of the article traveling on the two sides of the elevating object. The conveyance speed and conveyance direction can be changed, and there is no need to increase the running speed of the conveyor chain to convey goods at high speeds. This avoids the noise caused by high-speed drive of the conveyor chain, and also prevents lifting and lowering. By holding the body in a neutral position, when the article hits a stopper and is temporarily stopped while the tm conveyor chain is running,
Since the conveyance rollers supporting the articles are relatively reversed, damage to the lower surface of the articles can be prevented, and a large number of elevating bodies arranged in the conveying section can be individually driven up and down in groups. This has the effect that the transport speed of articles in each part of the transport section can be increased or decreased separately.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of an embodiment of the present invention, FIG. 2 is an enlarged sectional view, and FIG. 3 is a partially cutaway side view. 2: Conveyance chain 3: Support shaft 5: Large diameter section 6: Small diameter section 7: Conveyance roller 15: Lifting body 22: Upper contact slope 2
5: Lower contact plate 28: Air cylinder

Claims (1)

[Claims] Conveyance rollers with a large diameter section and a small diameter section arranged concentrically are rotated by a large number of support shafts that are placed at regular intervals between a pair of left and right conveyance chains that are parallel to each other, with the upper horizontal running section serving as the conveyance section. An upper contact plate is freely fitted to the outside of the conveying section of one of the conveying chains and passes above and below the conveying chain so that its tip can come into contact with the upper and lower surfaces of the small diameter section of the conveying roller. and a lower contact plate projecting from a neutral position where the upper and lower contact plates are spaced apart from the small diameter portion of the conveyance roller. A speed control device for a chain conveyor, characterized in that a drive device is provided for raising and lowering the upper contact plate to an upper position where the upper contact plate contacts the lower surface of the small diameter portion of the conveyor roller and a lower position where the upper contact plate contacts the upper surface of the small diameter portion of the conveyor roller.