JPH10266701A - Obstacle sensing mechanism of sliding door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an obstacle sensing mechanism which stops the movement of a door definitely and safely when something is caught in a sliding door or more specifically when the presence of an obstacle is sensed. SOLUTION: An obstacle sensor 5 is provided at the tip of a sliding door member 3 which moves in parallel to an opening 2 by way of a cushion member 4. The cushion member 4 uses a material which is low in thermal conductivity and deformable in elasticity. The obstacle sensor 5 uses a tape reed switch. An elastically deformable sheet member 6 is fixed with the tip of the door member 3 while the cushion member 4 and the obstacle sensor 5 are covered with the sheet member 6. A sensing cover 7 is fixed with the sheet member 6 under the condition that it is faced with the obstacle sensor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an obstacle sensing mechanism in a sliding door, and is mainly used for a closed container such as a sterilizer, a vacuum cooler, and a retort device.

[0002]

2. Description of the Related Art A slide type door is used as one of doors of various closed containers such as a sterilizer and a retort device. For example, a flat plate composed of a single plate having a thickness is moved up and down, or a shutter structure is moved between the top of the closed container at the open position and the opening at the closed position. .

[0003]

In the above-mentioned sliding door, it is required that the door be stopped immediately when an object is caught in the door. SUMMARY OF THE INVENTION It is an object of the present invention to provide an obstacle sensing mechanism that stops a door reliably and safely when an object is caught in the door, that is, when an obstacle is sensed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problem, and has an obstacle detecting sensor provided at a tip end of a sliding door member moving in parallel with an opening through a cushion member. This is a first feature of the present invention.
The second feature of the present invention is that the cushion member is a member having low thermal conductivity and capable of elastic deformation. In a third aspect of the present invention, the obstacle sensor is a tape reed switch. Further, according to the present invention, an elastically deformable sheet member is fixed to a tip of the door member, and the cushion member and the obstacle detection sensor are covered with the sheet member.
A fourth feature is that the sensing cover is fixed to the sheet member while facing the obstacle sensing sensor.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention mainly comprises a sterilizer,
The present invention is applied to a closed container under pressure such as a vacuum cooler and a retort device, but is also applicable to a door of a container to which no pressure is applied. The structure of the door is such that a flat plate composed of a single thick plate is moved up and down, and the shutter structure is moved between the top of the container at the open position and the opening at the closed position. It is applied to a device that is configured to be moved. That is, the present invention is applied to a sliding door that moves parallel to the opening.

An obstacle detection sensor is provided at the tip of the sliding door member via a cushion member. As the cushion member, a member having low thermal conductivity and capable of elastic deformation is used. The obstacle detection sensor uses a tape reed switch, which is provided over a length substantially equal to the width of the door member and has a predetermined length in a tape shape. By using the tape reed switch, the height of the whole obstacle sensing mechanism can be reduced and the obstacle sensing mechanism can be made compact.

An elastically deformable sheet member is fixed to the tip of the door member, and the seat member covers and protects the cushion member and the obstacle sensor. A sensing cover is fixed to the sheet member in a state of facing the obstacle sensor. A thin plate is used as the sensing cover, so that the sensing cover presses the obstacle detection sensor and can reliably detect the obstacle regardless of which part of the sensing cover comes into contact with the obstacle.

When the door member slides to a position to close the opening, and comes into contact with an obstacle such as a human body or a bogie, the door member stops as follows. The sensing cover contacts the obstacle, the sensing cover presses the obstacle sensor, and a signal indicating that the obstacle is sensed is sent from the obstacle sensor to the controller. Upon receiving this signal, the control device stops the driving means (electric motor) of the door member. At that time, the energy corresponding to the inertial velocity from when the obstacle detection sensor detects the obstacle to when the obstacle actually stops is absorbed by the elastic deformation of the cushion member, the seat member, and the detection cover, and damage to the obstacle detection sensor is prevented. Is prevented. Also, since the obstacle detection sensor is fixed to the tip of the door member via a cushion member having low thermal conductivity, even if the door member becomes hot, the heat is not transmitted to the obstacle detection sensor,
The obstacle detection sensor does not burn out.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a sterilizer having a door member having a shutter structure will be described below with reference to the drawings. FIG. 1 is a front view of a sterilizer to which the present invention is applied, and FIG. 2 is a longitudinal sectional view of the sterilizer to which the present invention is applied.

The inside of the closed container 8 is a sterilization chamber 9 and has a heating jacket 10 on the peripheral wall. Steam for heat sterilization is supplied to the sterilization chamber 9 and the heating jacket 10 by appropriate means. The heating jacket 10 may have a configuration in which a heating tube is provided around the heating jacket.

The closed container 8 has an opening 2 on a front surface thereof.
A guide rail 11 is provided from the opening 2 to the top of the closed container 8. A pair of guide rails 11 are provided on the left and right sides of the opening 2, and the door member 3 having a flexible shutter structure slides along the guide rails 11. That is, the door member 3
Is installed movably along the guide rail 11 between the opening 2 which is the closed position and the top of the closed container 8 which is the open position. A packing 12 is provided around the opening 2, and the packing 12 comes into contact with the back surface of the door member 3 to seal the sterilization chamber 9.

The tip of the door member 3 has an obstacle sensing mechanism 1
When the door member 3 comes into contact with an obstacle such as a human body or a truck for transporting an object to be sterilized, driving means (not shown) for driving the door member 3, for example, an electric motor or the like is stopped. Like that. Immediately after the door member 3 stops, the door member 3 is moved in the opposite direction, that is, toward the open position.

FIG. 3 shows the details of the door member 3 and the obstacle sensing mechanism 1. The door member 3 is configured by arranging a plurality of beam members 14 on a thin plate member 13 in parallel. For example, a square pipe is used as the beam member 14, and the longitudinal direction of the beam member 14 is set so as to be orthogonal to the moving direction of the door member 3, and the beam member 14 is partially fixed only at a portion in contact with the thin plate member 13. . Spot welding, bolts and the like are used as connecting means. Since the adjacent beam members 14 are in a free state without being fixed, when the door member 3 passes through the bent portion of the guide rail 11, the circumferential gap between the adjacent beam members 14 expands, The whole door member 3 smoothly bends and moves. Although a drive device for the door member 3 is not shown, for example, a chain member is provided on both side surfaces of the door member 3 and is driven by an electric motor via a sprocket.

The obstacle sensing mechanism 1 includes a cushion member 4 and an obstacle sensing sensor 5. The obstacle sensing sensor 5 is provided at the tip of the door member 3 via the cushion member 4. As the cushion member 4, a member having low thermal conductivity and capable of elastic deformation, for example, a sponge having heat resistance is used. The obstacle detection sensor 5 is provided over a length substantially equal to the lateral width of the door member 3 and uses a tape reed switch having a predetermined length in a tape shape.

An elastically deformable sheet member 6 is fixed to the tip of the door member 3, and covers the cushion member 4 and the obstacle detecting sensor 5 with the sheet member 3.
The sheet member 6 uses a rubber sheet made of EPDM and has a length substantially equal to the width of the door member. Further, a sensing cover 7 is fixed to the sheet member 6 in a state of facing the obstacle sensing sensor 5. The sensing cover 7 uses a thin plate made of a stainless alloy. In the illustrated embodiment, the sensing covers 7 are provided inside and outside the sheet member 6, respectively, so that the sheet member 6 is sandwiched between the two sensing covers. Several projections 15 are provided on the inner sensing cover 7 in the longitudinal direction of the sensing cover 7 to increase the pressing force applied to the obstacle sensing sensor 5 per unit area, thereby improving the sensitivity.

The sheet member 6 has one end fixed by a first fixing member 16 and the other end fixed by a second fixing member 17, and is suspended from the lower end of the door member 3. The first fixing member 16 has a length substantially equal to the lateral width of the door member 3, and has a side surface bent at an acute angle. By bending the side portion at an acute angle, it is possible to prevent the sheet member 6 from being caught on the first fixing member 16 when an obstacle is sandwiched. The length of the second fixing member 17 is set to be substantially the same as the width of the door member 3. In addition, a shift prevention plate (not shown) having substantially the same height as the suspended height of the sheet member 6 is provided at both left and right ends of the sheet member 6 so as to prevent the sensing mechanism from shifting toward the near side. ing.

When the door member 3 slides to the position where the opening 2 is closed and comes into contact with an obstacle such as a human body or a trolley for carrying an object to be sterilized, the door member 3 stops as follows. The sensing cover 7 comes into contact with the obstacle, the sensing cover 7 presses the obstacle detection sensor 5, and a signal indicating that an obstacle has been detected is sent from the obstacle detection sensor 5 to the control device. Upon receiving this signal, the control device stops the driving means (electric motor) of the door member 3. At that time, the energy corresponding to the inertial speed from when the obstacle detection sensor 5 senses the obstacle to when the obstacle actually stops is absorbed by the elastic deformation of the cushion member 4, the seat member 6 and the sensing cover 7, and the obstacle detection is performed. The damage of the sensor 5 is prevented.

Further, since the obstacle detecting sensor 5 is fixed to the front end of the door member 3 via the cushion member 4 having low thermal conductivity, even if the door member 3 becomes high temperature during sterilization, the heat is not affected. Is not transmitted to the obstacle detection sensor 5, and the obstacle detection sensor 5 does not break down due to heat.

In the embodiment shown in FIG. 3, the cushion member 4, the obstacle detection sensor 5, and the projection 15 are attached to the lower end of the door member 3 in this order.
5, the obstacle detection sensor 5, and the cushion member 4 can be attached in this order. That is, the cushion member 4 is fixed on the sensing cover 7, the obstacle detection sensor 5 is placed on the cushion member 4 upward, and the obstacle detection sensor 5 is pressed by the projection 15 provided at the lower end of the door member 3. It is a configuration to do.

FIG. 4 shows an embodiment of the electric circuit of the obstacle sensing mechanism 1. When a four-wire tape reed switch is used as the obstacle detection sensor 5, the contacts in the tape reed switch are separated at a normal time, a DC voltage of 24 V is applied to the relay 18, and the normal door member opening and closing is performed. The control is performed and the normal lamp 19 is turned on. When an obstacle is detected, the tape reed switch is pressed and the internal contacts come into contact, and the contact 2
0 moves to the stop side, stop control of the door member is performed, and the stop lamp 21 is turned on. If a 4-wire tape reed switch is used and the circuit configuration is as described above, even if the tape reed switch is disconnected or welded,
The door member stops, and the safety is high.

[0021]

As described above, according to the present invention, since the obstacle detecting sensor is provided at the tip of the door member via the cushion member, the obstacle detecting sensor actually detects the obstacle after detecting the obstacle. Energy corresponding to the inertial speed until the vehicle stops is absorbed by elastic deformation of the cushion member, thereby preventing damage to the obstacle sensor. Therefore, when an obstacle is detected, the door member can be stopped reliably and safely.

By using a cushion member having a low thermal conductivity, it is possible to prevent heat from being transmitted from the door member to the obstacle detection sensor, and to prevent the obstacle detection sensor from burning.

When a tape reed switch is used as the obstacle detecting sensor, the height of the entire obstacle detecting mechanism can be reduced and the object can be made compact.

The seat member is fixed to the tip of the door member, and the cushion member and the obstacle sensor are covered with the sheet member, thereby protecting the cushion member and the obstacle sensor and providing an obstacle sensing mechanism having excellent durability. It can be. In addition, by adopting a configuration in which the sensing cover faces the obstacle sensor and is fixed to the sheet member, even if any part of the sensing cover contacts the obstacle, the sensing cover presses the obstacle sensing sensor. Obstacles can be reliably detected.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment in which the present invention is applied to a sterilizer, and shows a state where a door member is moving.

FIG. 2 is a longitudinal sectional view showing one embodiment in which the present invention is applied to a sterilizer, and shows a state where a door member is in a closed position.

FIG. 3 is an enlarged side view showing an embodiment of an obstacle sensing mechanism according to the present invention.

FIG. 4 is an explanatory diagram showing one embodiment of an electric circuit used for an obstacle sensing mechanism in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Obstacle sensing mechanism 2 Opening 3 Door member 4 Cushion member 5 Obstacle sensing sensor 6 Seat member 7 Sensing cover

Claims (4)

[Claims] 1. An obstacle sensing mechanism for a sliding door, wherein an obstacle sensing sensor 5 is provided via a cushion member 4 at the tip of a sliding door member 3 which moves parallel to the opening 2. . 2. The obstacle detecting mechanism for a sliding door according to claim 1, wherein said cushion member is a member having low thermal conductivity and capable of being elastically deformed. Object sensing mechanism. 3. The obstacle detecting mechanism for a sliding door according to claim 1, wherein said obstacle detecting sensor is a tape reed switch. 4. The obstacle detecting mechanism for a sliding door according to claim 1, wherein an elastically deformable seat member is fixed to a tip of the door member, and the cushion member and the cushion member are fixed by the seat member. The obstacle detection sensor 5
An obstacle detecting mechanism for a sliding door, wherein the sensing cover 7 is fixed to the sheet member 6 with the sensing cover 7 facing the obstacle sensing sensor 5.