JPS60196457A - Chain stretcher - Google Patents

Abstract

PURPOSE:To stretch a chain continuously by providing two arms between a drive sprocket and a driven sprocket while providing pulleys to be stopped at the intermediate section of respective chain at the end of respective arm. CONSTITUTION:Two arms 34, 35 energized unilaterally to be rotatable integrally while making predetermined angle are provided between a drive sprocket 15 and a driven sprocket 16. While pulleys 36, 37 to be stopped at the intermediate portion of respective chain 17 are provided at the end of respective arm 34, 35. Since two arms 34, 35 will rotate as the inter-shaft distance between the drive sprocket 15 located at the fixed position and the movable driven sprocket 16 varies, respective sprocket 15, 16 and the chain 17 can be engaged well to stretch the chain 17 continuously through adjusting of the stretching length of chain 17.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a rotation transmission mechanism in which a pair of sprockets whose distance between axes changes is connected by a chain, and a chain used to keep the chain constantly tensioned. It concerns a tensioning device.

(Prior Art) Conventionally, in a rotation transmission mechanism in which a pair of sprockets are connected by a chain, there are various configurations of devices for keeping the chain constantly tensioned. If there is a difference, a pulley biased in one direction is pushed toward the middle part of the chain and the middle part is brought closer to each other, thereby obtaining a sufficient engagement between the smaller sprocket and the chain. In the case of a transmission mechanism with a plurality of sprockets of different diameters on one side, the pulley was used to prevent slack in the chain.

However, since the tensioning device described above is constructed on the assumption that a pair of sprockets are installed at their respective fixed positions, it cannot be used in a rotation transmission mechanism in which the distance between the axes of a pair of sprockets changes. Conventionally, there has been no chain tensioning device that can cope with the rotation transmission mechanism in which the distance between the shafts changes.

(Object 1.1 of the invention) This invention was made by focusing on the shortcomings of the conventional chain tensioning device as described in the drawings. It is an object of the present invention to provide a chain tensioning device that can keep the chain under tension in a transmission mechanism and can maintain a good state of engagement between the chain and each sprocket.

(Structure of the Invention) The structure of the chain tensioning device according to the present invention includes a driving sprocket mounted on a driving shaft, and a driven sprocket I/4111 mounted on a driven shaft that moves while maintaining a substantially parallel relationship with the driving shaft. In a rotation transmission mechanism in which the driving sprocket and the driven sprocket are connected by a continuous chain, the driving sprocket and the driven sprocket rotate integrally while maintaining a constant angle 1 about a rotating shaft provided coaxially with the driving shaft. Two arms are provided which are movable and biased in one direction, and at the tip of each arm, a lock 11- is attached to each intermediate portion of the chain.
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) 11. The urging force of each arm pulls the two middle parts of the chain together, making the chain tense.

(Example) The present invention will be explained below with reference to the drawings.

FIGS. 1 to 3 are diagrams explaining one embodiment of the present invention, and show water storage 11! ! In a dust remover that is equipped with a device-type conveyor for carrying out garbage, etc. from waterways and has a structure that allows the conveyor to be pulled as appropriate, when a chain tensioning device is installed in the rotation transmission mechanism that drives the conveyor. is exemplified.

That is, as shown in Figures 1 and 2, the dust remover 1 was installed following the flow of the waterway, and was installed at a distance from the water surface. A drive side is mounted on the inner end of the storage chamber 3 installed on the upper surface of the base a2, and is pivotally supported on a horizontal shaft 4 perpendicular to the water flow direction (direction of arrow A in FIG. 1). The upper sprocket 5 is rotatably provided, and a part of the storage chamber 3 is
A frame 7 is formed which extends in the direction of 2 and reaches the bottom surface 6 of the waterway, and a lower sprocket 8 which is a driven side with respect to the upper sprocket 5 is mounted at the rotating end of the frame I/-1, 7. It is set up in

Note that the lower sprocket 8 is located at 1-F of the frame 7.
The holding member (not shown) is guided along the direction, and is in a vertically movable state.

Then, so that the first sprocket 5 and the lower sprocket 8 can rotate at the same time, they are connected by a continuous one-way chain 2.
5, the lower sprocket 8, and the main chain 2 are installed at appropriate intervals in pairs on the left and right with respect to the water flow direction, and the main chain 2 on the opposite side is connected to the main chain 2 by a short distance from the main chain 2. A device-type conveyor is constructed by having a plurality of plate-shaped transport rakes 10 protruding in the right angle direction that can be taken at predetermined intervals.

Further, each main chain 2 is always under tension due to the weight of the lower sprocket 8A, which is provided so as to be movable in -1 direction.

Each rake 10 is oriented in a fixed direction with respect to the main chain 2, and is attached to each main chain 2 via brackets 11 provided at both ends of each rake.

Furthermore, a net-like screen 12 is provided on one side between the pair of main chains 2, and the screen 12 is secured using the brackets I and 11 of the rake 10.

Further, a pedestal 13 can be accessed outside the storage chamber 3, a drive motor 14 is installed on the pedestal 13, a drive sprocket 15 is attached to the drive shaft 14a of the drive motor 14, and the - Shaft 4 of L sprocket 5
(driven shaft) and the driven sprocket 16 attached to the i! I
In addition, 18 in the figure is rotatably supported at one end on the waste delivery side, and the wiping section at the other end is connected to the outer surface of the screen 12. A wiper is located at 5 and wipes away waste by wiping off the surface of the rake 10 that has been operated by the main chain 2, and 12 is a wiper stored at the bottom where the wiping operation is performed. A belt conveyor for conveying waste installed in the housing 20 connected to the chamber 3
Reference numeral 1 denotes a guide plate that is grounded on the bottom surface 6 at the lower end of the frame 7 and provided on the side facing the water flow.

Further, (on the -1- side of the board 2, a walkway 22 (indicated by a phantom line in the figure) is installed so as to surround the storage room 3.

Note that the upper sprocket 5 and the lower sprocket 8.
The conveyor constituted by the main chain 2 has an inclined shoulder shape with one end of the chain 1 slightly tilted in the direction of water flow. Depending on the width of the waterway, several dust removers 1 may be installed in parallel. (See Fig. 1) When the drive motor 14 of the dust remover 1 configured as shown in L is operated, the rotation of the drive sprocket 15 is transmitted to the driven sprocket 16 via the drive transmission chain 17. Part sprocket I.5 rotates integrally with driven sprocket 16, and this rotation is transmitted to part sprocket 8 via main chain 2.

At this time, the main chain 21 → descends on the side opposite to the water flow, and rotates in the direction of 7A on the opposite side (in the direction of arrow B in FIG. 1), and as the main chain 2 rotates, Each rake +10 scoops up the garbage that has been dammed up, and furthermore, the wiper 18 continuously performs the operation of sweeping away the garbage on the upper surface of the rake 10 onto the belt conveyor 191.

-1- In the dust remover 1 configured as described above and driven by 11 units, the main chain 2 may stretch during long-term use, but the sub-blocks I and 8 can be freely moved downward. Therefore, if the expansion Ii is within a certain range, the main chain 2 is always in tension due to the advantage of the F section sprocket I/8.

However, if the amount of elongation increases, for example, the rake 10 and the frame 7 may come into contact with each other, so the dust remover 1 is equipped with a device that lifts the entire conveyor up to 11 stages, as shown in FIG. It is.

That is, in the figure, 25 is slidable on a guide portion 26 formed along the tilting direction of the conveyor, and is connected to the upper sprocket 5 and the driven sprocket 16.
The holder 27 that holds the shaft 4 that pivotally supports the holder 25 has a threaded portion 27 on the end side.
The rod 28 formed with a is a gear case incorporating a gear mechanism (not shown) that engages with the male threaded portion 27a;
22 is a motor that drives the gear mechanism.

Then, a detection means (not shown) for detecting that the lower sprocket 8 has fallen below a certain amount due to elongation of the main chain 2 is used to turn on and off the motor 22, and when the motor 22 is activated, the gear -1-)? By doing so, the shaft 4 (driven shaft) can be raised and the entire conveyor can be pulled.

In other words, the support 4, which is the driven member 4q11, is in a state where it is being pulled apart from the drive shaft 14a of the drive motor 14, and the drive sprocket 15 of the drive shaft 14a and the support A chain tensioning device 30 is installed on the drive transmission chain 17 that connects the driven sprocket 16 of No. 4. It is.

That is, in the chain tensioning device 30, a bracket I.31 is fixed to the frame 13 of the drive motor 14, and a mark 11fI is written on the top end of the bracket I.31. Ell :li
A rotating shaft 32 coaxial with l+14a, and the rotating shaft 32
The center circle 1 bone 33 which is pivoted by
4.35 is set.

Each of the arms 34 and 35 rotates as a unit while maintaining a constant angle 1 about the rotating shaft 32 indicated by f1, and is rotated in the F direction by one arm (not shown). The old pattern is shown (in the direction of arrow C in Fig. 3).

Moreover, a pulley 3 is provided at the tip of each of the arms 34 and 35, respectively.
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1] When tensioning the chain 17 with the chain tensioning device 30 having the configuration described above, the drive sprocket 1
5 and the driven sprocket 16 on the first stage side of the chain 17.
Similarly, the lower side of the chain 17 is connected to the lower side of the pulley 37 of the lower side arm 35, and the upper side of the center pulley 33 is also connected to 1, so that the two Said chain 17 by means of biased arms 34,35
By pulling the second stage side and the lower stage side downward, the tension state of the entire circumference of the chain 17 is maintained.

Furthermore, when the conveyor is pulled up as described above, the driven sprocket 16 rises together with the shaft 4 as shown by the imaginary line in FIG. Although the chain 17 is rotated, the chain 17 is always maintained in a tensioned state because a downward force acting against the rotation acts along with the rotation.

Note that, as explained in the above embodiment, the two arms 34
．． A center slide 33 is provided at the center of rotation of the chain 1.
If the lower stage side of the chain 17 is also connected to the upper side of the center pulley 33, the lower stage side of the chain 17 will be brought closer to the lower stage side.
- Improve the engagement between the chain 15 and the chain 17.

(Effects of the Invention) As explained above, according to the chain tensioning device according to the present invention, the drive sprocket I, which is attached to the drive shaft, and the driven sprocket, which moves while maintaining a substantially parallel relationship with the drive shaft, In a rotation transmission mechanism in which a driven sprocket attached to a shaft is connected by a continuous chain, a certain angle 1 is formed between the driving sprocket and the driven sprocket with respect to a rotating shaft provided coaxially with the driving shaft. (2) Two arms are provided that rotate as one unit while maintaining the above-mentioned characteristics, and are operated in one direction, and a pulley is provided at the tip of each arm, which is respectively locked to each intermediate portion of the chain. Since the two arms rotate as the distance between the axes of the driving sprocket in a fixed position and the moving driven sprocket changes, a good engagement relationship between each of the sprockets and the chain is maintained, and the tension of the chain is reduced. It has the effect of being able to keep the chain tensioned at all times by adjusting the length of the chain.

[Brief explanation of drawings]

1 and 2 are a side sectional view and a front view illustrating the structure of a dust remover in which a chain tensioning device according to the present invention is installed, and FIG. It is a side view explaining the state installed on the chain. 4... Link (driven shaft), 14a... Drive shaft, 15... Drive sprocket, 16... Driven sprocket, 17... Chain, 30... Chain tension device, 32... Rotation Axis, 34.35... Arm, 36.37... Pulley. Patent applicant Daido Steel Co., Ltd. Representative patent attorney Yutaka Jil Ko

Claims (1)

[Claims] (+) In a rotation transmission mechanism in which a driving sprocket that is pivoted on a drive shaft and a driven sprocket that is pivoted on a driven shaft that moves while maintaining a substantially parallel relationship with the drive shaft are connected by a continuous chain. 11. The driving sprocket and the driven sprocket rotate together while maintaining a constant angle about a rotating shaft provided coaxially with the driving shaft.11. It has two arms pointing in one direction,
A chain tensioning device characterized in that a pulley is provided at the tip of each of the arms to be respectively locked to each intermediate portion of the chain.