JPS60197506A - Chain tensioner of vertical conveyor - Google Patents

Abstract

PURPOSE:To prevent contact of a chain with a frame by installing a lower sprocket in such an arrangement as sinking by its own weight, raising an upper sprocket, which is movable vertically when the displacement of said downward motion attains a certain amount, by means of a driver device, and thereby keeping the chain in tensed condition. CONSTITUTION:As a main chain 9 is being stretched a lower sprocket 8 sinks by its own weight together with a holder 42 so as to keep the chain 9 in tensed condition at all times. The sink of said holder 42 is fed into a load cell 41 through a wire 47, and a motor 26 is turned on when the measuring value of the load cell 41 attained a certain value so as to pull up a supporting rod 29 with a drive shaft 28 interposed, which raises in turn an upper sprocket 5 together with a horizontal shaft 4 to cause upward movement of the abovementioned lower sprocket 8 together with the main chain 9. This arrangement assures that the tension is always held by the lower sprocket and that the chain is prevented from contacting the frame.

Description

Detailed Description of the Invention (Industrial Application Field) This invention connects sprockets provided at the upper end and lower end of a device with a continuous chain, and connects a conveyance device such as a packet or rake to the chain. The present invention relates to a chain tensioning device that always keeps the chain in tension for use on an attached stationary conveyor.

(Prior Art) Conventionally, in the case of a conveyor using a chain as described above, the load of the conveyed articles is constantly applied to the chain, so the chain may stretch during long-term use. Naturally, the longer the conveyance distance or the heavier the article, the greater the degree of elongation, so the loosening of the chain may cause the conveyor to come into contact with the frame of the device, or the chain may rotate. There were problems such as poor movement and the possibility that the chain would come off the sprocket.

(Object of the Invention) The present invention has been made by focusing on the above-mentioned conventional problem, and is to maintain the tension state of the chain at all times even if the chain is stretched in a stationary type conveyor. In addition, the positions of the upper sprocket and the lower sprocket can be corrected so that the conveyance tool does not come into contact with the frame of the device due to the elongation, and malrotation of the chain and detachment of the chain can be prevented. The purpose of this invention is to provide a chain tensioning device that allows for

(Structure of the Invention) The structure of the chain tensioning device for a stationary conveyor according to the present invention is such that the upper sprocket on the driving side provided at the upper end of the device and the upper sprocket on the driven side provided at the lower end of the device are both simultaneously operated. In a stationary conveyor connected by a continuous chain so as to be rotatable, driving means is provided to support the upper sprocket so as to be movable upwardly, and the lower sprocket is provided movably upwardly and downwardly, so that the self-weight of the lower sprocket is used to move the above-mentioned Put the chain under tension, and
The present invention is characterized in that a detecting means for detecting the displacement of the lower sprocket is provided, and the displacement of the protrusion of the sprocket is detected by the signal etc. obtained by the detecting means, and the driving means detects the displacement of the sprocket. By moving up H, the position of the lower sprocket is corrected.

(Example) The present invention will be explained below based on the drawings.

FIGS. 1 to 6 are diagrams explaining one embodiment of the present invention, in which the lower end side of a stationary conveyor is submerged in water in a reservoir or waterway, and flowing garbage is dammed by a device, and This example shows a case where a chain tensioning device is installed in a dust remover that continuously carries out this garbage.

That is, as shown in Fig. ft. An upper sprocket 5 on the driving side is supported on the upper end side of the storage chamber 3 installed on the upper surface by a horizontal shaft 4 in an axial direction perpendicular to the water flow direction (direction of arrow A in FIG. 1).
is rotatably provided, and a frame 7 is formed by extending a part of the storage chamber 3 downward to reach the bottom surface 6 of the waterway,
A lower sprocket 8, which is a driven side of the upper sprocket 5, is rotatably provided on the lower end side of the frame 7.

Then, the upper sprocket 5 and the lower sprocket 8
The main chain 2 is continuous so that the two can rotate simultaneously.
Which combination of the upper sprocket 5, the lower sprocket 8, and the main chain 2 is installed at appropriate intervals on the left and right with respect to the water flow direction, and the pair of main chains 2 , a plate-shaped conveying rake 10 (
A set-up type conveyor is constructed by attaching a plurality of conveyor devices at predetermined intervals.

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

Moreover, a net-like screen 12 is provided on one side between the pair of primary chains 9, and the screen 12 is attached using the bracket 11 of the rake 10 in combination.

Further, a pedestal 13 is attached to the outside of the storage chamber 3, a drive motor 14 is installed on the pedestal 13, and a drive sprocket 15 is attached to the shaft of the drive motor 14.
and a driven sprocket 16 pivoted on the horizontal shaft 4 of the upper sprocket 5 are connected by a continuous chain 17, and 18 in the figure is rotatable at one end on the waste delivery side. A wiper is supported and has a wiping part on the other end located on the outer surface of the screen 12, and wipes away waste by wiping off the upper surface of the rake 10 that has risen with the operation of the main chain 2. a housing 20 connected to the storage chamber 3 on the lower side where the wiping operation is performed;
Further, 21 is 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.

Moreover, on the upper surface of the base a2, so as to surround the storage chamber 3,
A walkway 22 (indicated by phantom lines in the figure) is installed.

In addition, the upper sprocket 5 and the lower tin kerato 8.
The conveyor constituted by the main chain 2 and the like is installed in an inclined state with its upper end slightly tilted in the direction of water flow, and depending on the width of the waterway, several dust removers 1 are installed in parallel. (See Figure 2) When the drive motor 14 of the dust remover 1 configured as described above is operated, the rotation of the drive sprocket 15 is transmitted to the driven sprocket 16 via the chain 17, and the driven sprocket 16 is rotated. The upper sprocket 5 rotates integrally with the chain 16, and this rotation is transmitted to the lower sprocket 8 via the main chain 2.

At this time, the main chain 2 descends on the side facing the water flow and rises on the opposite side (direction of arrow C in FIG. 3).
As the main chain 2 rotates, each rake 10 scoops up the garbage that has been dammed up,
Further, the dust on the upper surface of the rake 10 is continuously brushed off onto the belt conveyor 12 by the wainoku 18.

The chain tensioning device configured and installed with the dust remover 11 that is driven as described above has a driving means for vertically supporting the upper sprocket 5 and a detection means for detecting the displacement of the lower sprocket 8. Separated.

The driving device 25 constituting the driving means is shown in FIGS. 3 and 4.
As shown in the figure, it is installed in the upper part of the storage chamber 3 corresponding to the pair of upper sprockets 5, and the storage chamber 3
a motor 26 provided approximately at the center of the motor 26;
A gear port with a built-in gear mechanism is connected to the pair of upper sprockets 5 and has an output section on each side of the pair of upper sprockets 5 (left and right sides in FIG. 4).
a pair of drive shafts 28, one end of which is engaged with the output portion of the Qiapox 27 and the other end of which is provided on the upper sprocket/5 side; and a support rod 22 that supports the upper sprocket 5.

The support rod 22 has a male threaded portion 2 on the upper end side that engages with a gear (not shown) provided on the other end side of the drive shaft 28.
9a is formed, and a holding member 30 is attached to the lower end side, and the holding member 30 is slidably fitted to a guide rail 31 provided outside the storage chamber 3, and A member 30 rotatably holds the horizontal shaft 4, which is the rotation shaft of the upper sprocket 5.

In other words, the upper sprocket 5 is connected to the drive device 2 described above.
5, it is supported in a state where it can move up and down by 8 degrees.

Also, at the same time as the upper sprocket 5 is moved upward,
Since the distance between the drive sprocket 15 provided on the drive motor 14 (see Fig. 2) of the dust remover 1 and the driven sprocket 16 provided on the horizontal shaft 4 changes, the distance between both sprockets 15 and 16 changes. A tension pulley device 32 is provided at the position, and the connecting chain 17 is connected via the tension pulley device 32.

The tension pulley device 32 has two arms 34 that swing together up and down while maintaining a predetermined angle around a pulley 33a of a bracket 33 fixed to the storage chamber 3 side.
．． 35, both arms 34, 35 are biased downward (in the direction of arrow C in FIG. 3) by an elastic body or the like (not shown), and a pulley 36, 36 is provided at the tip of each arm 34, 35, respectively.
37 is rotatably attached, and when attaching the continuous annular chain 17 to the driving sprocket 15 and the driven sprocket 16, the upper pulley 36 supports the part that stretches upwards slightly downward. , the lower part is passed under the lower pulley 37, and is further locked above the pulley 33a at the center of rotation.

Therefore, as shown by the imaginary line in FIG. 3, even if the driven sprocket 16 rises, the urging force that resists the rotation is generated in accordance with the rotation of each arm 34° 35 of the tension pulley device 32. The chain 1
7 is always in a state of tension.

In the figure, 38 is a Kia case that covers the engagement portion between the other end of the drive shaft 28 and the support rod 22, and 32 is a retainer that rotatably holds the drive shaft 28 on the upper surface of the storage chamber 3. , 40 are clutches that are installed midway along the drive shaft 28 to intermittent transmission of rotation.

On the other hand, as a detection means for detecting the displacement of the lower sprocket 8, pressure obtained by the displacement of the lower sprocket 8 is applied to a piezoelectric crystal (for example, barium titanate),
A load cell 41 is used to measure the voltage displacement, and the load cell 41 is installed beside the gear case 38 outside the storage chamber 3.

As shown in FIGS. 5 and 6, the lower sprocket 8 has two support portions 4 hanging down from the lower surface of the holder 42.
It is rotatably supported by a shaft 43 whose both ends are supported by 2a and 42a.

In addition, a bracket 44 having a horizontal tensioning portion 44a is fixed to the frame 7, and two guide tubes 45 with downward openings are arranged in parallel on the upper surface side of the horizontal tensioning portion 44a, and further, on the upper surface side of the holder 42. Two guide rods 46 are provided upright corresponding to the positions of the guides tr4 and tr45.

Then, each guide rod 46 is connected to each guide tube 45.
At the same time, the lower sprocket 8 and the main chain 2 are engaged with each other.

Therefore, the lower sprocket 8 can be moved up and down by sliding between the guide rod 46 and the guide tube 45, and at the same time is held by the main chain 2, and the weight of the lower tin rocket 8 and the holder 42 is This makes the main chain 2 tense.

Furthermore, one end of a wire 47 is connected to the upper end surface of the guide rod 46 on one side. (not shown) in the load cell 41
(See Figure 3).

The chain tensioning device configured as described above operates the motor 2 of the drive device 25 based on the signal obtained from the load cell 41.
A circuit device, etc. (not shown) is provided so that the switch No. 6 can be automatically turned on and off.

Next, the operation of the chain tensioning device will be explained.

As the main chain 2 gradually expands, the lower sprocket 8 moves down together with the holder 42 as the main chain 2 expands, and the main chain chain continues to be kept in tension by its own weight.

At this time, the wire 47 is being pulled as the holder 42 is lowered, and at the same time, a tensile force is input to the load cell 41.

When the measured value of the load cell 41 receiving the tensile force exceeds a certain value, a signal is generated to connect the switch of the motor 26, the motor 26 is automatically operated, and the support rod 22 is moved through the drive shaft 28. By pulling up, the -L part sprocket 5 is raised together with the horizontal shaft 4.

Therefore, as the upper sprocket 5 rises, the lower sprocket 8 also moves upward via the main chain 2,
The lower sprocket 8 is pulled up by the amount that the main chain 2 has expanded, as shown by the imaginary line in FIG.

At this time, as the holder 42 moves upward together with the lower sprocket 8, the tensile force of the wire 47 decreases, but if the measured value of the load cell 41 due to the tensile force falls below a certain value, or if the tensile force is not applied. When this happens, a signal is generated to turn off the switch of the motor 26, thereby stopping the motor 26 and stopping the upper sprocket 5 from rising.

In addition, in the above embodiment, in order to detect the displacement of the lower sprocket due to the extension of the main chain 2, the load cell 41 is used as a detection means, but it is also possible to use a limit switch or the like. It is.

Furthermore, in the above embodiment, the signal obtained by the detection means is
Although the driving means for raising the upper sprocket 5 is configured to operate automatically, for example, the motor 2 of the driving device 25
6 may be replaced by a manual rotation operating lever or the like directly connected to the gear box 27, and a meter or the like may be used to indicate the state of displacement measured by the detection means.

Furthermore, the chain tensioning device can be applied not only to the dust remover 1 shown in the above embodiment but also to various types of conveyors in which a conveyor is attached to a chain.

(Effects of the Invention) As explained above, according to the chain tensioning device for a stationary conveyor of the present invention, the upper sprocket on the drive side provided at the upper end of the device and the upper sprocket on the driven side provided at the lower end of the device. A stationary conveyor in which a lower sprocket and a lower sprocket are connected by a continuous chain so that both can rotate at the same time, and a driving means is provided to support the upper sprocket so as to be movable up and down, and the lower sprocket is provided so as to be movable up and down. Since the chain is kept in a tensioned state by the weight of the lower sprocket and is further provided with a detection means for detecting displacement of the lower sprocket, it is possible to always maintain the tensioned state of the chain, and to prevent the chain from elongating. displacement of the lowered lower sprocket can be detected by the sensing means, and further;
According to the detection means, the position of the lower sprocket that has descended as the chain extends can be corrected to its original position by pulling up the upper sprocket;
It is advantageous in that it eliminates contact between transport equipment such as packets and rakes and equipment frames due to loosening of the elongated chain, as well as failures in chain rotation, and also prevents accidents such as the chain coming off the sprocket. It has a great effect.

[Brief explanation of drawings]

1 and 2 are side sectional views and front views of a dust remover equipped with a stationary conveyor on which a chain tensioning device according to the present invention is installed, and FIG. 3 illustrates a chain tensioning device according to an embodiment of the present invention. FIG. 4 is a rear view of FIG. 3, and FIGS. 5 and 6 are a front sectional view and a side view of the lower sprocket. 1... Dust remover 5... Upper sprocket 8... F part sprocket 9... Main chain (chain) 10... Rake (carrying device) 25... Drive device (drive means) 41. ...Load cell (detection means) Patent applicant: Daido Steel Co., Ltd. Representative patent attorney Yutaka Oshio Figure 3

Claims (1)

[Claims] (1) In a stand-alone conveyor in which a driving-side upper sprocket installed at the upper end of the device and a driven-side lower sprocket installed at the lower end of the device are connected by a continuous chain so that both can rotate simultaneously. , a drive means is provided for supporting the upper sprocket so as to be movable up and down, and the lower sprocket is provided so as to be movable up and down so that the chain is tensioned by the weight of the lower sprocket, and the displacement of the lower sprocket is detected. A chain tensioning device for a stationary conveyor characterized by being provided with a detection means.