JPH08232532A - Thermostatic chamber - Google Patents

Abstract

PURPOSE: To hold the airtight press-contacting properties of a thermostatic chamber by slidably forming a door by an automatic opening-closing mechanism and bringing the door into press- contact by the automatic opening-closing mechanism when the door reaches the front place of an opening section. CONSTITUTION: When a motor 9 for sliding is rotated forwards under the state, in which an opening section is opened, the racks of the lower side face of a door 4 are driven in the closing direction through gears 18, 19, guided by guide wheels on both upper and lower side faces and moved from a fixed guide rail 40 to a guide rail 39, and reach the front places of the opening section and are stopped automatically. A motor 25 for the press-contact of the door is driven automatically, a shaft 29 is rotated through gears 28, 34, and the lower section of the door 4 is brought into press-contact with the edge of a main-body opening section through an eccentric cam 37, etc. A shaft 30 is turned simultaneously from an interlocking shaft 36 through a bevel gear 35 fixed at the left end of the shaft 29, and the upper section of the door 4 is brought into press-contact with the edge of the main-body opening section while being synchronized with the press-contact of the lower section through an eccentric cam 37, etc., fastened onto the shaft 30. The door is stopped automatically when the state of maximum press-contact is brought by the operation of the eccentric cam 37, and the door 4 is brought to the state, in which the main-body opening section is closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant temperature oven having an improved door device. More specifically, it does not require a space for opening and closing the door in front of the opening, is easy to combine with an automatic loading / unloading device for the sample, and is equipped with a door device that seals the opening to maintain a constant temperature. The present invention relates to a constant temperature bath capable of holding temperature and humidity set in a bath under predetermined conditions.

[0002]

2. Description of the Related Art Generally, a conventional constant temperature oven is provided with a door body that can be opened and closed at the front opening of the constant temperature oven main body, and is manually rotated to the front to open and close the constant temperature oven main body opening to maintain the constant temperature of the door body. Airtight pressure contact with the rim of the opening of the bath main body is manually performed by a closed handle, etc., but in such a conventional constant temperature bath, the door body is opened and closed in front of the opening of the constant temperature bath main body. Requires a large space.

In particular, when combined with a device for automatically loading / unloading the sample into / from the constant temperature bath body, if a large space is provided for opening the door in front of the opening of the constant temperature bath body, it becomes a loading / unloading device. There is a problem that the combination of cannot be done easily. Therefore, as described in, for example, Japanese Patent Publication No. 26542/1990, a door body formed of a flexible and heat-resistant sheet is provided at the front opening of the thermostatic chamber body, and the door body is wound and rewound. By opening and closing the lever opening, the space in front of the opening is made smaller and the sample is automatically loaded.
A constant temperature bath has been proposed which is easy to combine with a carry-out device.

[0004]

In the above-mentioned proposed constant temperature oven, since the door body is a sheet, there is a problem in airtight pressure contact between this and the constant temperature oven main body opening. Furthermore, JP-A-2-71
There is a proposal of Japanese Patent No. 851, but since the door body is also a sheet, a complicated airtight pressure contact mechanism is required, and there is a limit to the durability and wind pressure in the constant temperature tank applied to the door body, and circulation in the tank is required. Since the amount of air blown is limited and the door sheet is generally made of synthetic resin, there is a problem that sufficient electrostatic charge prevention measures must be taken, especially when the DUT is an electronic device.

The present invention has been made in view of the above circumstances and does not require a space for opening and closing the door in front of the opening of the thermostatic chamber main body, and therefore can be easily combined with the automatic sample loading / unloading device. In addition, a heat insulating material was built into the door to make it a heat insulating rigid door to improve airtight pressure contact with the edge of the opening of the thermostatic chamber main body, so that the circulating air flow inside the thermostatic chamber can be freely selected. The purpose is to provide.

Further, since the door of the constant temperature oven according to the present invention is made of a non-electrostatic material, it does not require any antistatic measures against static electricity. Safety is considered by controlling the opening / closing drive torque of the door so as not to exceed the set value when the hand is caught during automatic opening / closing and by preventing the door from being opened / closed forcibly.

[0007]

The constant temperature bath according to the present invention comprises:
A thermostatic chamber main body with an open front, a heat-insulating rigid body door (hereinafter referred to as "door") that slides and opens the opening of this thermostatic chamber main body with a guide rail, an opening / closing mechanism that automatically opens and closes this door, and this door A constant temperature bath provided with a pressure contact mechanism that presses airtightly against the edge of the opening. The door is provided with a guide car that travels while being guided by the guide rails.

The door opening / closing mechanism includes a door sliding motor capable of rotating in the forward and reverse directions, a base body fixed to the rotating shaft of the sliding motor, and a rotating shaft of the sliding motor stacked on the base body. Has a first spur gear rotatably supported by, and movably an engaging element (a) having a substantially spherical engaging portion on one of opposing portions of the base body and the first spur gear. , And a receiving hole in which the engaging portion of the engaging element (a) is releasably engaged with the other, and the base body, Via one spur gear, the intermediate spur gear (or intermediate spur gear train), and the final spur gear,
The door is automatically opened / closed by driving a rack gear fixed to one outer surface of the door.

The automatic opening / closing torque of the door is determined by the engaging element (a).
It can be set to a constant value by adjusting the urging force to the door, and the engagement part of the engaging element (a) is set to the disengaged state when the door is caught when the door is automatically opened and closed. Do not forcibly open and close.

In the constant temperature oven according to the present invention, the automatic pressure contact mechanism for pressing the door against the opening edge of the constant temperature oven body interlocks the first rotating shaft rotated by the door pressure contact motor with the one outer surface of the door. A second rotary shaft that is interlocked with the first rotary shaft by a gear train is provided near the opposite outer surface of the door, and a plurality of eccentric cams are fixed to each of the first and second rotary shafts, and the eccentric A stay is fixed to the main body of the constant temperature bath so as to correspond to the cam, and a cam blower that is rotatably supported by the stay and is combined with the eccentric cam is provided. A channel is provided at the tip of the plurality of cam floors corresponding to each of the rotating shafts. -Shaped guide rails are fixed respectively, and a plurality of engaging elements (b) corresponding to these guide rails are attached to the upper and lower outer surfaces of this door, and when the door is in the closed position, rotation of the door pressure welding motor is performed. More, the eccentric cam, Kamufurowa, through the guide rail and the engaging element (b), automatically presses the door in conjunction vertical synchronization with a thermostat body opening edge.

The guide rail is fixed together with the movable part, which is fixed to the cam floor so that the guide rail is rotated together with the cam floor to press the door against the edge of the opening. It consists of a fixed part that guides the guide car, and guides the guide car attached to this door when the door is opened and closed.

The final spur gear and the rack gear are slid on their meshing surfaces with respect to the movement of the door for pressure contact. With this structure, the automatic opening / closing mechanism of the door becomes irrelevant to the movement for the pressure contact of the door except for the rack gear, and the installation of the automatic opening / closing mechanism can be simplified.

[0013]

Since the constant temperature bath according to the present invention has the above structure,
When the door is in the state where the opening of the temperature chamber body is open, the motor for sliding the door is rotated forward, and the door is slid by the automatic opening / closing mechanism, and the motor for sliding when the door comes to the front position of the opening of the temperature chamber body. Then, the door pressure welding motor is rotated, and the door is pressed against the edge of the thermostatic chamber main body opening by the automatic pressure welding mechanism, and when the airtight pressure is applied, the door pressure welding motor is stopped and the constant temperature chamber main body opening part is opened. Can be closed.

Further, when the door is in a state where the opening of the constant temperature chamber main body is closed, the door pressure contact motor is rotated and the door is separated from the edge of the constant temperature chamber main body opening by the automatic pressure contact mechanism, and the door is opened. When the door pressure contact motor is stopped at the front position, the sliding motor is then rotated in the reverse direction, the door is slid by the automatic opening / closing mechanism, and the sliding motor is stopped when the door reaches the constant temperature bath main body opening position, The opening of the thermostatic chamber main body can be opened.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a constant temperature bath according to the present invention will be specifically described below with reference to the drawings. 1 is a perspective view of the front surface of a constant temperature oven according to the present invention, FIG. 2 is a side view showing the structure of a door, FIG. 3 is a perspective view for explaining a pressure contact mechanism of the door, and FIG. 4 is an explanatory view of a door slide mechanism. 5A and 5B are enlarged views of the door slide mechanism. In FIG. 5, FIG. 5A is a front view of the base body, FIG. 5B is a side view, and FIG.

In FIGS. 1, 2 and 3, reference numeral 1 is a thermostatic chamber main body, which is provided with a door 4 in front of the opening 2 on the front surface of the thermostatic bath main body 1 and with an opening edge 3 of the door 4. Rubber packings 5 are attached to the contact portions, and two guide wheels 6 are provided on the upper and lower side surfaces of the door 4 to guide the opening and closing of the doors 4, respectively. Two engaging elements (b) 7 for press-contacting 3 are attached, and a rack gear 8 is fixed to the lower surface of the door 4.

Reference numeral 9 is a forward / reverse rotatable slide motor, which is fixed to a mounting plate 10 attached to the constant temperature bath main body 1. A rotary shaft 11 of the slide motor 9 has a base body 12 which is split and tightened by a screw. It is fixed.

A spur gear 15 is rotatably supported on a shaft portion projectingly formed on a side surface of the base body 12 about a center of the rotary shaft 11. Further, an intermediate spur gear 18 and a spur gear 19 are rotatably attached to the mounting plate 10, and are sequentially meshed with the spur gear 15-intermediate gear 18-spur gear 19-the rack gear 8.

Reference numeral 25 is a door pressure welding motor for the constant temperature bath main body 1
A spur gear 28 is fixed to a rotating shaft of the door pressure welding motor 25.

Reference numerals 29 and 30 designate rotating shafts, respectively.
Is provided in the vicinity of the lower surface of the door 4 by two sets of stays 31 attached to the lower part of the constant temperature bath main body 1, an attachment plate (not shown) and a plurality of bearings attached to the attachment plate 26.
The rotating shaft 30 is supported in parallel with the plane of the constant temperature chamber main body opening 2, and the rotating shaft 30 is provided by two sets of stays 31 attached to the upper part of the constant temperature chamber main body 1 and a plurality of bearings attached to a mounting plate (not shown). In the vicinity of the upper side surface of the door 4, the door 4 is supported parallel to the plane of the constant temperature bath main body opening 2.

A spur gear 34 is fixed to the rotary shaft 29, and the spur gear 34 is meshed with the spur gear 28. A bevel gear 35 is fixed to the left ends of the rotating shafts 29 and 30, respectively, and meshes with bevel gears 35 fixed to the lower end and the upper end of the interlocking shaft 36, respectively. Further, an eccentric cam 37 is fixed to each of the rotating shafts 29 and 30, and the eccentric cam 37 is rotatably supported by the stay 31 so as to be rotatable.
Is combined with.

Corresponding to the rotary shafts 29 and 30, one channel-shaped guide rail 39 is fixed to the tip of each of the two cam floors 38,
The engaging elements (b) 7 are fitted to these guide rails 39. 40 is a channel-shaped fixed guide rail,
To be continuous to the right of the two guide rails 39,
It is fixed to the upper and lower parts of the constant temperature bath body 1.

Next, the operation of the sliding type opening / closing mechanism of the door 4 and the pressure contact mechanism to the opening edge 3 in the constant temperature bath will be described. 4 is an explanatory view of a slide mechanism of the door 4, and FIG. 5 is a door 4
3A and 3B are enlarged views of the slide mechanism, in which FIG. 7A is a front view of the base body, FIG. 7B is a side view, and FIG.

In FIG. 5, the gear 15 is prevented from coming off by a C ring 16 fitted to the side portion of the shaft portion 14,
A spacer 17 is provided between the C ring 16 and the gear 15.
Is intervening. Further, the base body 12 and the gear 15 are equidistant from the center of the rotating shaft 11 and are separated from each other by 120
A through hole 20 and a receiving hole 21 are formed at an angle of 0 °, respectively, and a spherical ball 22 is moved to the right and left in the through hole 20 as an engaging element (a) whose outer surface is an engaging portion. The push screw 23 and the ball 22 are freely fitted and screwed together so that the push screw 23 can move forward and backward freely.
The ball 22 is constantly urged to the right by a spring 24 mounted between the ball 22 and. Thereby, the receiving hole 2 of the gear 15
1 and the ball 22 are disengageably engaged. The diameter of the receiving hole 21 is smaller than the diameter of the ball 22, and
The diameter of the through hole 20 is slightly larger than the diameter of the ball 22.

2 to 5, when the door 4 is housed in the upper and lower fixed guide rails 40 and the opening 2 of the constant temperature bath main body is in the open state, the sliding motor 9 is driven to rotate in the forward direction by a switch operation. And the rotating shaft 11 rotate in the forward direction, the spur gear 15 rotates in the forward direction via the base body 12 and the balls 22 as the engaging elements (a), and the gears 18 and 1
The rack 8 fixed to the lower side surface of the door 4 is driven in the closing direction via 9 and the door 4 is guided by the guide wheels 6 fixed to the upper side surface and the lower side surface of the door 4 to move from the fixed guide rail 40 to the guide rail 39. When the door 4 reaches the front position of the constant temperature chamber main body opening 2, the sliding motor 9 automatically stops.

Then, the door pressing motor 25 is automatically driven by the switch operation, and the rotary shaft 29 is rotated through the gears 28 and 34, while the eccentric cam 37, the cam flower 38 fixed to the rotary shaft 29, Guide rail 3
9, the lower portion of the door 4 was pressed against the opening 3 of the constant temperature bath main body through the engaging element (b) 7, and at the same time, fixed to the lower end of the bevel gear 35 and the interlocking shaft 36 fixed to the left end of the rotary shaft 29. The rotating shaft 30 rotates via the bevel gear 35, the interlocking shaft 36, the upper bevel gear 35, and the bevel gear 35 fixed to the left end of the rotating shaft 30,
Eccentric cam 37 fixed to rotating shaft 30, cam flower 3
The upper portion of the door 4 is pressure-contacted to the opening edge 3 of the constant temperature bath main body via the guide rail 39 and the engaging element (b) 7 in synchronization with the lower pressure contact. When the door 4 is brought into the maximum pressure contact state by the operation of the eccentric cam 37, the door pressure contact motor 25 is automatically stopped, and the door 4 is in the state in which the constant temperature chamber main body opening 2 is closed.

Further, when the door 4 in the closed state is opened, the door pressing motor 25 is driven by a switch operation, and the mechanism of the pressing operation is reversely operated to open the door 4 in the constant temperature chamber main body opening 2. When the door 4 is returned to the front position and the eccentric cam 37 is actuated to bring the door 4 into the maximum open state, the door pressure welding motor 25 is automatically stopped.

Next, the switch automatically again drives the sliding motor 9 in the reverse direction to reversely operate the closing mechanism to move the door 4 in the opening direction.
When is stored in the upper and lower fixed guide rails 40, the sliding motor 9 is automatically stopped and the constant temperature chamber main body opening 2 is opened.

The automatic opening / closing drive torque of the door 4 is determined by the base body 1.
2 can be set to a constant value by adjusting the urging force to the ball 22 by advancing and retracting the push screw 23 through the spring 24 in the through hole 20 provided in 2, and the hand is caught when the door 4 is automatically opened and closed. In such a case, when an opening / closing driving torque of a set value or more is generated, the engaging portion of the ball 22 is disengaged and the opening / closing of the door 4 is temporarily stopped.

In the above-mentioned embodiment, the one-door door having one door is explained, but it is also possible to adopt a double-door structure in which two doors are opened and closed in both directions.

[0031]

EFFECTS OF THE INVENTION Since the constant temperature oven according to the present invention has the above-mentioned structure, it requires almost no space for opening and closing the door in front of the opening of the constant temperature oven main body, and can be used as an automatic sample loading / unloading device. It can be easily combined, and the door is made of a rigid body with a built-in heat insulating material to maintain sufficient heat insulation as a door and airtight pressure contact with the opening edge of the thermostatic chamber main body, and the amount of circulating air in the chamber. It is a constant temperature bath that can be freely selected. Further, the opening and closing drive torque of the door body can be set to a constant value, and the opening and closing of the door body can be temporarily stopped when an excessive load is applied, which is a highly safe thermostatic chamber.

[Brief description of drawings]

FIG. 1 is a perspective view of a front surface of a constant temperature oven according to the present invention.

FIG. 2 is a side view showing a configuration of a door body.

FIG. 3 is a perspective view for explaining a pressure contact mechanism of a door body.

FIG. 4 is an explanatory view of a door body sliding mechanism.

FIG. 5 is an enlarged view of a door body sliding mechanism. (A) A front view of a base body. (B) The side view of a base body. (C) A back view of the base body.

[Explanation of symbols]

 1. Main chamber 2. Constant temperature chamber main body opening 3. Edge of opening of main body of constant temperature bath 4. Heat-insulating rigid door 5. Rubber packing 6. Guide car 7. Engagement element (b) 8. Rack gear 9. Motor for slide 12. Base body 15.18.19.28.34. Gear 22. Ball as engaging element (a) 23. Push screw 24. Spring 25. Door pressure welding motor 29.30. Rotating shaft 35. Bevel gear 36. Interlocking shaft 37. Eccentric cam 38. Camfloor 39. Guide rail 40. Fixed guide rail

Claims (4)

[Claims] 1. A heat-insulating rigid door for slidingly opening and closing an opening of a thermostatic chamber main body guided by a guide rail, an opening / closing mechanism for automatically opening and closing the door, and an airtight press contact of the door with the edge of the opening. A constant temperature bath provided with a pressure contact mechanism, wherein a guide wheel that is guided by the guide rail to travel is provided on the door, and the opening and closing mechanism includes a slide motor that rotates forward and backward and a rotation of the slide motor. A base body fixed to the shaft, engageably and disengageably engaged with the base body, and rotatably supported by the rotation shaft of the sliding motor, and fixed to one outer surface of the door via an intermediate gear. And a spur gear that drives a rack gear, and the pressure contact mechanism includes a cam floor rotatably supported by a pair of stays fixed above and below the opening, and an eccentric cam combined with the cam floor. ,door A constant temperature bath comprising a pressure welding motor and a transmission mechanism for transmitting the rotation of the door pressure welding motor to the eccentric cam. 2. The guide rail comprises a movable part fixed to the cam follower, rotating together with the cam follower to press the door against the edge of the opening, and a fixed part fixed to the main body of the thermostat to guide the guide wheel. The constant temperature bath according to claim 1. 3. The constant temperature oven according to claim 1, wherein engaging members for pressing the door are attached to the upper and lower sides of the door. 4. The constant temperature oven according to claim 1, wherein the eccentric cam is configured to interlock in a vertically synchronized manner via a transmission mechanism by the rotation of the door pressure welding motor.