JP2003182834A - Transport conveyer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transport conveyer device capable of keeping a stable conveying state with less vibration of a conveyed article for a long time without tooth jump even in high load conveyance and high speed conveyance close to the maximum allowable tension of a chain. <P>SOLUTION: This transport conveyer device comprises, a chain 102 for conveyance circulated and suspended along a supply route and a return route that are vertically travelling between a driving sprocket 101 and a driven sprocket, and at least one return roller 103 for supporting the return route of the chain 102 from the downside. A horizontal distance A between the centers of the driving sprocket 101 and the return roller 103 is shorter than a half of the outer diameter of the driving sprocket 101. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor system for conveying articles such as plastic bottles and cans. 2. Description of the Related Art Conventionally, in order to transport articles such as PET bottles and cans, a top plate for placing articles to be transported on a chain upper surface as shown in FIGS. Transport conveyor devices 400 and 500 using a so-called top chain are widely used. [0003] The conveyor units 400, 500 are provided with conveying chains 402, 502 along drive paths and return sprockets (not shown) along up and down parallel paths between the drive sprockets 401, 501 and driven sprockets. Are circulated, and articles are placed and transported on the transport surface of the transport chain on the forward path. In such a conveyor system, the return path of the conveyor chain is slackened.
As described above, a return roller 403 is provided to support the slack of the chain 402 from below. In addition, as shown in FIG.
By providing the return roller 503 at a position where the horizontal distance A between the center of the drive sprocket 501 and the center of the return roller 503 is equal to one half of the outer diameter 2R of the drive sprocket 501, the chain 502 is wound around the drive sprocket 501 by 180 degrees and the tooth jump occurs. Increasing the tension was also performed. [0005] However, in the above-described conveyor system, when high-load conveyance or high-speed conveyance in which the maximum allowable tension acts on the conveyance chain is performed, the chain jumps. This causes a problem that the transport state becomes unstable, and further improvement is expected from these points. Further, it is considered that the factor which determines the tooth jumping tension in the conveyor system is the balance between the force applied to the teeth when the chain is disengaged from the sprocket and the chain tension on the slack side. It was thought that it was sufficient to wind the cable 180 degrees. However, when the inventors of the present invention intensively investigated and analyzed the relationship between the position of the return roller and the tooth jumping tension, unexpectedly, the tooth jumping tension was Not only determined by the wrap angle of the sprocket but also by the position of the return roller even at the same wrap angle. Therefore, an object of the present invention is to secure a stable transport state of a transported article with little shaking even for high-load transport and high-speed transport near the maximum allowable tension of a chain for a long period of time. It is an object of the present invention to provide a transfer conveyor device capable of performing the above-mentioned operations. [0008] According to a first aspect of the present invention, there is provided a transporting conveyor device which circulates and extends between a driving sprocket and a driven sprocket along a vertical path parallel to a forward path and a reverse path. Conveyor having at least one return roller for supporting a return chain of the transport chain from below and a return chain of the transport chain, the article being placed on the transport surface of the transport chain and transported on the forward path. , The horizontal distance between the center of the driving sprocket and the center of the return roller is equal to two times the outer diameter of the driving sprocket.
The above problem is solved by adopting a configuration that is less than one-half. The transport conveyor apparatus according to the present invention has the above-mentioned components, and therefore has the following specific operation to the present invention. According to the conveyor device of the first aspect, the tooth jumping tension is increased, and the article is stably conveyed without tooth jumping even near the maximum allowable tension of the chain. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 1 shows a driving sprocket 101 in a conveyor device according to the present invention.
The positional relationship between the transport chain 102 and the return roller 103 is shown. When the horizontal distance between the center of the driving sprocket 101 and the center of the return roller 103 is A, and the radius of the driving sprocket 101 is R, the return roller 103 is pivoted at a position where A <R. here,
The radius R of the driving sprocket 101 is the distance between the center of the driving sprocket 101 and the tip of the tooth of the driving sprocket 101, that is, 2 times the outer diameter of the driving sprocket.
Means one in one. By pivotally providing the return roller 103 at such a position, the jumping tension of the transport chain is greatly increased. FIG. 3 shows that the vertical distance between the center of the drive sprocket and the center of the return roller is constant (in this measurement, the sum of the radius of the drive sprocket and the radius of the return roller). The figure shows the result of measuring the value of the tooth jump tension for three types of transport chains when the ratio (A / R) of the horizontal distance A to the center of the return roller is changed. In the figure, a shows the results for a new transport chain, b shows the results for a transport chain that has grown by 1%, and b shows the results for a transport chain that has grown in a life stage of 2.4%. . As is apparent from FIG. 3, the value of A / R is 1
By making it smaller, that is, by setting A <R, the tooth jump tension is improved. The vertical distance is not necessarily the sum of the radius of the driving sprocket and the radius of the return roller, but if it is substantially constant, the relationship between the A / R and the tooth jump tension, that is, the value of A / R is 1 The relation that the tooth jumping tension is improved by making it smaller is
It was also confirmed that it did not change. Next, a second embodiment which is another embodiment of the present invention will be described with reference to FIG. FIG. 2 shows a drive sprocket 20 in another conveyor device according to the invention.
1, the positional relationship between the transport chain 202 and the return roller 203 is shown. When the horizontal distance between the center of the driving sprocket 201 and the center of the return roller 203 is A and the radius of the driving sprocket 201 is R, A <R is satisfied, and the driving sprocket 201 and the return roller 203 are satisfied. The value obtained by subtracting the radius R of the drive sprocket 201 and the radius r of the return roller from the distance B between the outer circumferences of the drive chain, ie, the distance between the centers of the drive sprocket 201 and the return roller 203, is the height C of the transfer chain.
The return roller 203 is pivoted at a position larger than the above. By pivoting the return roller 203 at such a position, the assembling work for suspending the transport chain 202 between the drive sprocket 201 and the return roller 203 is facilitated. As described above, according to the conveyor device of the first aspect, the tooth jump tension increases,
Even in the vicinity of the maximum allowable tension of the chain, it is possible to stably convey a conveyed article without skipping teeth. Further, the effect of the transfer conveyor device of the present invention is extremely large because it can be realized by a simple modification of changing the position of the return roller of the existing device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a main part of a first embodiment of a transport conveyor device of the present invention. FIG. 2 is a side view showing a main part of a second embodiment of the conveyor device of the present invention. FIG. 3 is a diagram showing a relationship between a position of a return roller and tooth jump tension. FIG. 4 is a side view showing a main part of a conventional conveyor device. FIG. 5 is a side view showing a main part of another conventional conveyor device. [Description of Signs] 101, 201, 401, 501 ... drive sprockets 102, 202, 402, 502 ... transport chains 103, 203, 403, 503 ... return rollers

Claims (1)

Claims 1. A transport chain circulated along a forward path and a return path extending vertically between a drive sprocket and a driven sprocket, and a return path of the transport chain. A transport conveyor device having at least one return roller supported from below, and loading and transporting an article on the transport surface of the transport chain on the forward side path, wherein a center of the drive sprocket and a center of the return roller is provided. A conveyor system wherein the horizontal distance is less than half the outer diameter of the drive sprocket.