JP2008143666A - Runaway preventive device for tilting or vertical conveyer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease the size and weight and to save cost in a runaway preventive device by easing impact when a hanger is stopped after a runaway. <P>SOLUTION: The runaway preventive device comprises an endless chain 11 provided with a dog abutting on and locking to a downstream side surface of the hanger moved by a conveyer, a driving sprocket 8 and a driven sprocket to which the endless chain 11 is engaged, a geared motor 13 driving the driving sprocket 8, a brake device stopping the endless chain 11 when the hanger runs away, and a runaway detecting device detecting the runaway of the hanger. A torque limiter 5 is provided between an output shaft 14 of the geared motor 13 and the driving sprocket 8, and a limit value of the rotation transmitting torque of the torque limiter 5 is set to be smaller than brake torque by the brake device. The torque limiter 5 shuts out torque exceeding the limit value of the rotation transmitting torque, so that impact generated when the hangerd is stopped after the runaway is eased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a runaway prevention device for detecting the runaway and stopping the runaway support means when the runaway support means for supporting the runaway runs away in an inclined or vertical conveyor, and prevents the runaway. Is.

  As a conventional runaway prevention device for inclined conveyors, an endless chain that moves parallel to the descending slope portion of the transfer path is provided with a number of locking pieces that come into contact with the moving direction side of the locking arms provided on the conveyor hangers, A drive device including a drive chain and a reduction motor that drives the endless chain at a speed slightly higher than a conveyor speed, and a detection device that detects a change in tension between a tension state and a loose state of the drive chain; The detecting device detects the change in tension generated when the locking arm presses the locking piece forward when the hanger runs out of control, and stops the driving device and brakes the braking device ( For example, see Patent Document 1.).

Japanese Utility Model Publication No. 57-89515 (Fig. 1-6)

  Since the runaway prevention device of Patent Document 1 is configured to stop the runaway hanger instantaneously by the braking force of the braking device, the impact at the time of stoppage becomes very large, so that the hanger or the like of the conveyor is damaged There is. Moreover, since it is necessary to give each mechanical element of a runaway prevention apparatus the intensity | strength which can endure such a big impact, a runaway prevention apparatus becomes large in size and cost.

  Therefore, in view of the above-described situation, the present invention intends to solve the problem of reducing the size and weight and reducing the cost by the configuration that can reduce the impact when stopping the transported object supporting means that supports the transported object after the runaway. It is in the point which provides the escape prevention apparatus of the inclination or vertical conveyor which can aim at.

  An apparatus for preventing runaway of an inclined or vertical conveyor according to the present invention is a downstream side surface of a conveyed product support means that is arranged in parallel to a path including at least the path in a conveyor having a downward gradient path or a vertical path and moves by the conveyor. An endless chain provided with dogs that contact and lock at predetermined intervals, a driving sprocket and a driven sprocket with which the endless chain engages, a driving device that drives the driving sprocket, and an appropriate portion of the driving system A braking device that stops the endless chain when the transported object support means runs out of control, and a runaway prevention device that detects a runaway detection device that detects the runaway of the transported object support means, the output of the drive device A torque limiter is provided between the shaft and the drive sprocket, and the limit value of the rotation transmission torque of the torque limiter is controlled by the limiter. Those obtained by set smaller than the braking torque by the device.

  Here, the drive device is floatingly supported so as to be rotatable about the output shaft, and the runaway detection device is configured such that the dog of the endless chain is pressed when the transport object support means runs away. It is preferable that the rotation of the driving device is detected.

  According to the escape prevention device for an inclined or vertical conveyor according to the present invention, in a conveyor having a downward gradient path or a vertical path, the conveyor support means that is arranged in parallel with the path including at least the path and moves by the conveyor. Endless chains provided with dogs that contact and lock on the downstream side surface at predetermined intervals, driving sprockets and driven sprockets engaged with the endless chains, driving devices for driving the driving sprockets, and appropriate portions of the driving system A runaway prevention device having a braking device for stopping the endless chain at the time of runaway of the transported object support means and a runaway detection device for detecting runaway of the transported object support means. A torque limiter is provided between the output shaft and the drive sprocket, and the limit value of the rotation transmission torque of the torque limiter is The braking torque is set to be smaller than the braking torque of the braking device, so that when the runaway detection device detects the runaway of the conveyed product support means, the driving device is deactivated and the braking device is activated to apply the braking torque. A torque exceeding the limit value of the rotation transmission torque is cut off by the limiter. That is, the transmission on the input side (the drive device side that stops instantaneously by the braking device) and the output side (the load side such as the drive sprocket and endless chain) are temporarily disconnected, and between the input side and the output side The conveyance support means does not stop instantaneously due to slipping, and the impact received by the conveyance support means, the dog, the endless chain, the sprocket, and the driving device is alleviated. Therefore, since it is not necessary to give each mechanical element of the runaway prevention device strong enough to withstand a large impact, the runaway prevention device can be reduced in size, weight, and cost.

  Further, the drive device is floatingly supported so as to be rotatable around the output shaft, and the runaway detection device presses the dog of the endless chain when the transported object support means runs out of control. In addition to the above-described effects, since it is possible to detect the runaway of the transported object supporting means stably and reliably, the reliability of the operation of the escape prevention device is improved. .

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all the embodiments that satisfy the requirements described in the claims. It is a waste. In the present embodiment, the transport direction of the object to be transported is the front, and the left and right are the left and right toward the front. Moreover, let the figure seen from the right side be a front view.

  1 to 4 are explanatory views showing a configuration in which the escape prevention device according to the embodiment of the present invention is used in a downward inclined portion of a conveyor, FIG. 1 is a front view, and FIG. 2 is a main portion around a drive device. 3 is an enlarged front view, FIG. 3 is a plan view, and FIG. 4 is a sectional view taken along the line CC in FIG. Although a power and free overhead conveyor is shown as an example of the conveyor, the conveyor to which the runaway prevention device according to the present invention is applied is not limited to the power and free overhead conveyor.

  In FIG. 1, a power chain (not shown) is supported on the power rail PR, and a trolley (not shown) is supported on the free rail FR, and the driving force of the power chain is transmitted to the trolley. Drive along. The trolley is connected with a hanger H which is a conveyed product support means, and the conveyed product W is supported by the hanger H. As shown in FIG. 1, the power rail PR and the free rail FR, which are conveyor rails, have a downward gradient path that descends toward the downstream side (conveyance direction).

  The escape prevention device 1 is supported by the upstream fixed frame 7A and engages with the drive device 2 that drives the drive sprocket 8, the driven sprocket 9, the drive sprocket 8, and the driven sprocket 9 that are supported by the downstream fixed frame 7B. The dog 12 is stretched between the sprockets 8 and 9, supported by a guide rail 10 provided at least including the descending slope path and parallel to the path, and abutting and engaging with the downstream side surface of the hanger H. Are constituted by an endless chain 11 provided at predetermined intervals, a take-up device 3 for applying tension to the endless chain 11, a runaway detection device 4 for detecting the runaway of the hanger H, and the like. Here, the dogs 12,... Provided on the endless chain 11 driven by the driving device 2 move at substantially the same speed as the moving speed of the conveyor. The drive device 2 and the drive sprocket 8 may be disposed on the downstream side, and the take-up device 3 and the driven sprocket 9 may be disposed on the upstream side.

  As shown in FIGS. 2 to 4, the driving device 2 includes a geared motor 13 having an orthogonal shaft configuration using, for example, a hypoid gear or a bevel carrier, and the output shaft 14 to which the output torque of the geared motor 13 is transmitted is illustrated in FIG. 4. As shown in FIG. 2, the bearings 15 and 16 of the fixed frame 7A are supported and rotated. As shown in FIG. 4, a hub 21 of the torque limiter 5 is connected and fixed to the output shaft 14, and an annular plate 24 is fitted on the hub 21, and the right friction plate fixed to the left surface of the hub 21. 22 and the left friction plate 23 fixed to the right surface of the plate 24, the drive sprocket 8 is mounted, and the disc springs 25,... Supported by the spring retainers 26,. Since the left and right friction plates 22 and 23 are pressed against the drive sprocket 8, the torque on the input side (drive device 2 side) is within the range of the cutoff torque (the limit value of the rotation transmission torque of the torque limiter 5). Drive sprocket 8 etc.). Note that the cutoff torque of the torque limiter 5 can be adjusted by the adjusting bolts 27,.

  A brake device 6 such as an electromagnetic brake for stopping the endless chain 11 when the hanger H runs away is attached to the motor shaft of the geared motor 13. Such a brake device is separate from the geared motor 13. Alternatively, it can be provided at an appropriate location of the drive system. The breaking torque of the torque limiter 5 is set smaller than the braking torque by the braking device 6. The braking torque in this specification refers to the torque converted to the load side when the braking device is provided on the motor shaft as in this embodiment, and when the braking device is provided on the load side. Indicates the braking torque.

  As shown in FIG. 2, the dogs 12,... Are positioned on the lower side of the endless chain 11. The left and right support pieces 29, 29 extending obliquely forward from the chain 11, and inserted into the long holes 29A extending in the longitudinal direction at the distal ends of the support pieces 29, 29, and the intermediate portion of the locking piece 28 in the longitudinal direction It is comprised by the pin 30 which protrudes from right and left, and becomes a substantially y shape seeing from the right side. Therefore, when the hanger H runs away on a downward slope path, the rear surface of the front end of the locking piece 28 of the dog 12 contacts the downstream side surface of the hanger H.

  Next, the configuration and operation of the runaway detection device 4 will be described. As shown in FIGS. 2 and 3, the movable piece 17A that extends substantially forward from the main body frame of the drive device 2 (geared motor 13) is provided above the middle position in the front-rear direction, and has a relatively small spring constant. It is elastically supported by a compression coil spring 18 that is easily elastically deformed, and a head 17B is formed at the tip of the movable piece 17A. When the main body frame, the movable piece 17A and the head 17B of the driving device 2 are elastically deformed by the compression coil spring and rotated about the left and right axis A in the direction of the arrow B (see FIG. 2), the position detection switch. Since the limit switch 19 is pressed, the limit switch 19 can detect the rotation of the main body frame of the driving device 2 that is floatingly supported.

  Therefore, as shown in FIG. 2, when the hanger H that is the transported object supporting means runs away in the downward slope path, as described above, the rear surface of the front end of the locking piece 28 of the dog 12 is provided on the downstream side surface of the hanger H Since the endless chain 11 is pushed by the hanger H, the main body frame of the driving device 2 and the movable piece 17A and the head 17B which are elastically supported by the compression coil spring 18 which is easily elastically deformed as described above are moved in the horizontal direction. It rotates in the direction of arrow B around the axis A, and the rotation is detected by the limit switch 19 as described above. In this way, the runaway of the hanger H can be detected. In this way, a simple and highly reliable configuration in which the rotation of the main body frame of the floatingly supported drive device 2 that reliably rotates when the hanger H runs out of control is detected by the limit switch 19 with high operational reliability. This makes it possible to stably and reliably detect the runaway of the conveyed product support means, and thus improve the reliability of the operation of the runaway prevention device.

  Next, the operation after the runaway detection device 4 detects the runaway of the hanger H that is the conveyed product support means will be described. When the runaway detection device 4 detects the runaway of the hanger H, the drive device 2 (geared motor 13) is deactivated and the braking device 6 is activated. In this manner, in the state where the braking torque of the braking device 6 is applied, as described above, the breaking torque of the torque limiter 5 is set smaller than the braking torque of the braking device 6, and thus exceeds the breaking torque by the torque limiter 5. Torque is cut off. That is, the transmission on the input side (the drive device 2 side that stops instantaneously by the braking device 6) and the output side (the load side such as the drive sprocket 8 and the endless chain 11) are temporarily disconnected, and the input side and the output side Thus, the hanger H does not stop instantaneously, and the impact received by the hanger H, the dog 12, the endless chain 11, the sprockets 8 and 9, the drive device 2, and the like is alleviated. Therefore, since it is not necessary to give each mechanical element of the runaway prevention device 1 strength sufficient to withstand a large impact, the runaway prevention device 1 can be reduced in size, weight, and cost.

  In the above description, the configuration in which the escape prevention device of the present invention is used for an inclined conveyor is shown, but the escape prevention device according to the present invention can also be used for a vertical conveyor.

It is a front view which shows the structure which used the runaway prevention apparatus which concerns on embodiment of this invention for the downward inclination part of a conveyor. It is a principal part enlarged front view around a drive device. It is also a plan view. FIG. 4 is a sectional view taken along the line CC in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Escape prevention device 2 Drive device 3 Take-up device 4 Runaway detection device 5 Torque limiter 6 Braking device 7A, 7B Fixed frame 8 Drive sprocket 9 Drive sprocket 10 Guide rail 11 Endless chain 12 Dog 13 Geared motor 14 Output shaft 15, 16 Bearing 17A Movable piece 17B Head 18 Compression coil spring 19 Position detection switch (limit switch)
20 Operation part 21 Hub 22, 23 Friction plate 24 Plate 25 Belleville spring 26 Spring retainer 27 Adjustment bolt 28 Locking piece 29 Supporting piece 29A Long hole 30 Pin PR Power rail FR Free rail H Hanger (Transported object supporting means)
W Conveyed items

Claims (2)

In a conveyor having a downward gradient path or a vertical path, a dog that is arranged in parallel with a path including at least the path and that abuts and engages with the downstream side surface of the conveyed product supporting means that moves by the conveyor is provided at predetermined intervals. Endless chain formed, the drive sprocket and driven sprocket with which the endless chain engages, the drive device for driving the drive sprocket, and the endless shape provided at the appropriate place of the drive system when the transported object supporting means runs out of control. A braking device that stops the chain, and a runaway prevention device having a runaway detection device that detects runaway of the transported object support means,
An inclination characterized in that a torque limiter is provided between the output shaft of the driving device and the driving sprocket, and the limit value of the rotation transmission torque of the torque limiter is set smaller than the braking torque by the braking device. Or an escape prevention device for vertical conveyors. The drive device is floating supported so as to be rotatable around the output shaft,
2. The inclined or vertical conveyor according to claim 1, wherein the runaway detection device detects rotation of the driving device caused by pressing of the dog of the endless chain when the transported object support means runs away. Escape prevention device.

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