JPH044993Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a door control device for a constant temperature chamber, particularly equipped with an electric type door, used for environmental tests and the like.

[Prior art and its problems]

2. Description of the Related Art Constant temperature chambers are known in which electronic components and the like are housed in an internal environmental test chamber for a predetermined period of time, and reliability tests are performed under predetermined temperatures and temperature conditions.

Conventionally, thermostatic chambers with electrically operated doors have a sliding door on the front, and the door is opened and closed by manual operation of an open/close switch located on the front panel.

However, if you forget to close the door of this type of constant temperature chamber, the internal air of the environmental test chamber will leak to the outside from the workpiece take-out port, and the environmental test chamber will also be entered from the air intake port (see numeral 21 in Figure 4). outside air is taken in. As a result, the temperature and humidity in the environmental test chamber fluctuate, which not only adversely affects the test conditions, but also causes problems such as the internal cooler freezing or frost forming near the workpiece outlet. Ta.

[Means for solving problems]

The object of the present invention is to provide a door control device for a thermostatic chamber that solves the problems existing in the prior art described above, and is achieved by the control device 1 shown below.

That is, the thermostatic oven door control device 1 according to the present invention is a thermostatic oven S that controls the door D using an electric method, and a sensor section 3 that detects an object F entering and exiting from a workpiece outlet 2 that is opened and closed by the door D. Then, timing is started when the door D is opened, and is reset when the sensor section 3 is in the detection state, and timing is started when the sensor section 3 is in the non-detection state,
It is characterized by comprising a timer function section 4 that times up after a set time Ta has elapsed, and a control function section 5 that closes the door D upon the time-up.

[Effect]

Next, the operation of the present invention will be explained.

In the door control device 1 according to the present invention, for example, when a door D is opened by manually operating an opening/closing switch, a timer function section 4 starts measuring time. Then, if the object F such as the test object is taken in and out from the workpiece removal port 2,
The sensor section 3 enters the detection state, and the timer function section 4 is reset. On the other hand, when the object F finishes entering and exiting, the sensor section 3 enters a non-detection state and starts measuring time again. Then, after a preset time Ta has elapsed, time is up and the door D is closed by the control function section 5. Also, the setting time
Similar operations are repeated even if the sensor section 3 enters the detection state multiple times during Ta.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a block system diagram of the door control device according to the present invention, Fig. 2 is a time chart of the timer function section in the door control device, and Fig. 3 is a perspective view of a constant temperature oven equipped with the door control device. FIG. 4 is a longitudinal sectional view of the environmental test chamber inside the thermostatic chamber.

First, in order to clarify the present invention, the schematic structure of the thermostatic chamber will be explained with reference to FIGS. 3 and 4.

Thermostatic chamber S is an environmental test chamber 11 sealed in the upper half.
Equipped with Further, a workpiece outlet 2 is provided on the front surface of the upper half, and this outlet 2 is opened and closed by a glass door D that slides in the vertical direction. Door D is electrically driven and controlled by operating an open/close switch 14 on an operation panel 13. This opening/closing switch 14 is a momentary switch, and when operated to the open side or the closed side, the door D is automatically opened/closed. On the other hand, on the inside front side of the environmental test chamber 11, an air shield 15 is disposed by cutting a flexible sheet material to cover the workpiece take-out port 2 when the door D is in the half-open position. Further, a partition plate 16 is arranged at the rear side of the interior of the environmental test chamber 11, and behind this partition plate 16, a blower 17, an electric heater 18, and an electric heater 18 shown in FIG.
Necessary functional parts such as a cooler 19, a humidifying tray 20, an air intake port 21, etc. are arranged. In addition, 22 in the figure is a foot switch, and door D can be opened by stepping on it with the foot.

On the other hand, the front panel located on both the left and right sides of the workpiece extraction port 2 is provided with a light emitter 23 on one side and a light receiver 24 that receives the light emitted from the light emitter 23 on the other side, and the optical sensor unit 3 Configure. The light emitter 23 and the light receiver 24 are, for example, area sensors, and can detect the object F at any position in the workpiece outlet 2.

Next, the door control device 1 that controls the door D will be explained with reference to FIGS. 1 and 2.

The light emitter 23 and the light receiver 24 are connected to the control unit 2.
Connect to 5. The control section 25 includes the control function section 5. The control section 25 also includes the on/off switch 1.
4. Connect the foot switch 22, timer function section 4, and door drive section 26, respectively. Door drive section 26
is composed of a drive motor, a motion conversion mechanism, etc., and drives the opening/closing door D to open and close. In addition, the timer function section 4
The time Ta until the timer starts is set in advance (Fig. 2a). The size of this set time Ta varies depending on the test conditions, etc., but it is usually desirable to set it to about 15 seconds. On the other hand, the timer function section 4 operates the on-off switch 14 to the open side or the foot switch 2
When 2 is operated, time measurement starts at that timing. However, if the door D is opened and an object F such as a test object is taken in or taken out from the workpiece outlet 2, the sensor section 3 enters the detection state, and the timer function section 4 is thereby reset. And sensor part 3
It has the function of restarting timekeeping when the timer is in a non-detection state.

Next, the overall function will be explained.

Now, for example, if the opening/closing switch 14 is operated to the open side, the door D is automatically opened via the control section 25 and the door driving section 26. Simultaneously with this timing, the timer function section 3 starts measuring time. At this time, after the door D is opened and the time Tc (Tc<Ta) shown in FIG. When the sensor section 3 enters the detection state, the timer function section 4 is reset via the control function section 5 (control section 25). Then, when the predetermined work is completed and the opening/closing switch 14 is operated to the close side, the door D is automatically closed. However, even if you forget to close the door, when the sensor unit 3 goes into a non-detection state (time tr in Fig. 2), the timer function unit 4 starts measuring time again, and the door D automatically closes after the set time Ta has elapsed. . Well, Figure 2 b
In the case where the work is performed again after the time tr, the timer function section 4 is similarly reset, and the timer is counted again, and the same process is repeated.

Although the embodiments have been described in detail above, the present invention is not limited to these embodiments.
For example, the sensor section is an optical sensor, but
Any other sensor capable of detecting an object can be used, and its location is not limited to the embodiment. Further, the setting time of the timer function section is arbitrary, and may be set variably from the outside as necessary. Other details such as composition, shape,
Arbitrary changes in arrangement, quantity, etc. can be made without departing from the gist of the present invention.

[Effect of idea]

As described above, the door control device for a constant temperature oven according to the present invention is provided with a sensor section that detects an object entering and exiting from the workpiece take-out port that is opened and closed by the door, and when the door is opened, the clock is opened and the sensor section A timer function section that is reset when the sensor is in the detection state, starts counting when the sensor section goes into a non-detection state, and times up after the set time elapses, and a control function section that closes the door based on this time up. Be prepared and get the following effects.

It can prevent freezing of the cooler and frost formation near the workpiece outlet, eliminating the problems associated with forgetting to close the door after work.

Since the timer function section is always reset during work, it is possible to prevent accidents such as hands being caught in the door, and it can function as a safety device.

[Brief explanation of the drawing]

Fig. 1: Block system diagram of the door control device according to the present invention, Fig. 2: Time chart of the timer function section in the door control device, Fig. 3: Perspective view of a constant temperature oven equipped with the door control device. Figure 4: Vertical cross-sectional view of the environmental test chamber inside the thermostatic chamber. In the drawings, 1... door control device, 2... workpiece, 3... sensor section, 4... timer function section, 5...
...control function unit, D...door, F...object, S...
Constant temperature chamber, Ta...setting time.

Claims (1)

[Scope of utility model registration request] In a door control device for a constant temperature chamber that controls a door using an electric method, a sensor unit that detects an object entering and exiting from a workpiece removal port that is opened and closed by the door;
A timer function section that starts timing when the door opens, is reset when the sensor section is in the detection state, starts timing when the sensor section is in the non-detection state, and times out after the set time elapses. A door control device for a thermostatic oven, comprising: a control function section that closes the door according to the time-up.