JPH01283317A - Door opening/closing mechanism - Google Patents

Abstract

PURPOSE:To prevent the action of excessive force on a chain which opens and closes a side opening door supported freely slidably by means of guide shafts by forwarding and driving said chain by a pneumatic actuator. CONSTITUTION:The side opening door 12 is supported freely slidably by a pair of the guide shafts 11 disposed horizontally to two stages, upper and lower. This door 12 is opened and closed by the forwarding action of the driving chain 18. The chain 18 is forwarded and driven by the pneumatic actuator 12 via sprocket wheels 19, 15, 17. The load above the supply air pressure of the pneumatic actuator 2 is thereby acted on said actuator even if the opening/ closing action of the door 12 is stopped halfway by a certain cause. The forwarding and driving of the chain 18 are thereby stopped at the point of this time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a door opening/closing mechanism, and more particularly to a door opening/closing mechanism including a side opening door and a chain for opening and closing the door.

[Conventional technology]

2. Description of the Related Art Conventionally, a door opening/closing mechanism having a configuration as shown in a perspective view of FIG. 2 has been used in a heat treatment furnace (not shown) and the like. This door opening/closing mechanism 10 includes a pair of guide shafts IL 11 horizontally disposed in upper and lower stages, and a pair of horizontally opening doors 12.11 that are slidably supported by these guide shafts 11.11. 12, and a chain 14 which is connected to each side-opening door a12 via a connecting fixture 13 and opens and closes each of the side-opening doors 12°12 in the left-right direction by a forwarding operation. and,
A sprocket wheel 15 is provided at one end of the chain 14 (on the right side in the figure) to drive the chain, and a sprocket wheel 16 is provided at the other end to support the chain 14 in a freely forwarding manner. .

Further, a separate sprocket wheel 17 is disposed coaxially with the sprocket wheel 15, and a drive chain 18 that drives the chain 14 through this sprocket wheel 17 and the sprocket wheel 15 is disposed on the sprocket wheel 17. is wrapped around it. A sprocket wheel 19 for forwarding and driving the drive chain I8 is disposed on the other end side (lower side in the figure) of the drive chain I8. The drive shaft of the morph 20, which can also rotate, is connected.

Therefore, when carrying in and out of the heat treatment furnace in which the door opening/closing mechanism 10 is installed, the motor 2 is first moved based on a door opening signal from a control device (not shown).
0 rotates counterclockwise, the driving chain 18 is forward-driven, and at the same time, the chain 14 is forward-driven via the sprocket wheel 15.17, and this chain 14 causes the horizontal opening 5? , 12.12 will be slid open in the direction away from each other. When the loading/unloading work is completed, the motor 20 rotates clockwise based on the door open signal, and the chain 14 is driven in the opposite direction via the drive chain 18 and sprocket wheels 15 and 17. However, the door opening/closing mechanism IO having the above structure has the following problems. That is, even if the horizontal opening door 12.12 gets caught on another member or part for some reason and its opening/closing operation is stopped midway, the motor 20 will continue to operate the horizontal opening 812.12 to open/close it to a predetermined position. This results in overload. Therefore,
There have been problems in that the overloaded motor 20 may seize up, and the chains 15, 11 that have been subjected to excessive force may be damaged or broken.

This invention was devised to solve these problems, and even if the opening/closing operation of the side-opening door is stopped midway, it will not cause inconveniences such as motor seizure or chain damage. The purpose is to provide a door opening/closing mechanism that can prevent this from happening.

[Means to solve the problem]

The present invention provides a door opening/closing mechanism that includes a horizontally opening door slidably supported by a guide shaft and a chain that opens and closes the horizontally opening door by a forwarding motion, including a pneumatic actuator that drives the chain to forward. This is a door opening/closing mechanism with a unique structure.

[Effect]

According to the above configuration, since the horizontally opening door is opened and closed by driving the chain with the pneumatic actuator, if the horizontally opening door is stopped in the middle of its opening/closing operation,
A load greater than the supplied air pressure is applied to the pneumatic actuator, and the chain forwarding drive by the pneumatic actuator stops at that point. the result,
Excessive force is not applied to each chain, and inconveniences such as chain breakage and breakage are effectively prevented.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view showing a schematic configuration of a door opening/closing mechanism according to the present invention. In this figure, reference numeral 1 indicates the door opening/closing mechanism, and 2 indicates a rodless cylinder as a pneumatic actuator. The configuration of the door opening/closing mechanism 1 according to this embodiment is basically the same as the conventional example except that a rodless cylinder 2 is used in place of the motor 20 described above. Identical or corresponding parts and portions are given the same reference numerals, and their explanations will be omitted.

In this door opening/closing mechanism 1, a side opening door 12. A rodless cylinder 2 is used as a drive source for opening and closing the drive chain 18, and a sliding member of the rodless cylinder 2, a so-called piston mount 3, which is erected on the outside of the drive chain 18, connects a connecting fixture 4. It is connected to a predetermined position of the drive chain 18 via the drive chain 18 .

It goes without saying that the pneumatic actuator is not limited to the rodless cylinder 2, and may be, for example, a regular cylinder with a dustproof cover.

Next, the operation of the door opening/closing mechanism 1 will be described assuming that it is installed in a heat treatment furnace (not shown).

When loading and unloading the materials to be treated into the heat treatment furnace, first, high-pressure air adjusted to a predetermined pressure is supplied to the upper side of the cylinder tube of the rodless cylinder 2 based on a door opening signal from a control device (not shown). As a result, the drive chain 18 is forward-driven, and at the same time, the chain 14 is forward-driven via the sprocket wheel 15.17, which is rotated counterclockwise. Each will be opened by sliding in a direction away from each other. In addition, when the loading/unloading work described in 04j is completed, high-pressure air is supplied to the lower side of the cylinder tube of the rodless cylinder 2 based on the door open signal, and the drive chain 18 is driven to be forwarded to the sprocket wheel. 15° 17 is rotated clockwise, the chain 14 is driven forward in the opposite direction, and each of the lateral openings 1812, 12 is slid toward each other and closed.

In the above explanation, the door opening/closing mechanism 1 has been explained as being applied to a heat treatment furnace, but it is not limited to this, and it is also possible to apply it as a door opening/closing mechanism in other devices. .

〔Effect of the invention〕

As explained above, in the door opening/closing mechanism according to the present invention, the chain for opening and closing the side opening door, which is slidably supported by the guide shaft, is forward-driven by a pneumatic actuator in place of the conventional motor. ,
If the side-opening door is stopped in the middle of its opening/closing operation for some reason, a load greater than the supplied air pressure will be applied to the pneumatic actuator, and the forwarding drive of the chain by the pneumatic actuator will stop at that point.

As a result, an excessive force is not applied to each chain, and it is possible to prevent inconveniences such as damage or breakage of chains as in the conventional example.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a schematic configuration of a door opening/closing mechanism according to the present invention, and FIG. 2 is a perspective view showing a schematic configuration of a door opening/closing mechanism according to a conventional example. In the figure, 1 is a door opening/closing mechanism, 2 is a rotless cylinder (pneumatic actuator), 11 is a guide shaft,
X2 is a side opening door, and 14 is a chain. =7 − Note that the same reference numerals in the figures indicate parts and portions that are the same or correspond to each other.

Claims (1)

[Claims] (1) In a door opening/closing mechanism comprising a horizontally opening door slidably supported by a guide shaft and a chain that opens and closes the horizontally opening door by a forwarding motion, a pneumatic actuator is provided to drive the chain to forward. A door opening/closing mechanism characterized by: