JPH0216990Y2 - - Google Patents

Description

[Detailed Description of the Invention] The disclosed technology belongs to the technical field of a reliable detection mechanism for a sealed opening/closing door for a sealed housing such as a heat treatment furnace.

Therefore, in this invention, a parabolic guide is provided vertically on the side of the opening used for loading and unloading workpieces in the sealed housing of the heat treatment furnace, etc., and the sealing door is moved parallel to the guide in a parabolic shape. The opening/closing operation detection device is configured to be raised and closed by the guide via a roller along the housing, and is comprised of a limit switch provided on the side of the opening of the housing and a dog provided in conjunction with the door. This is a device-related device, in particular, a guideline such as a piano wire with a predetermined span is provided vertically on the side of the housing at the side of the opening, and the dog is engaged in a vertically movable manner, and the dog is brought into contact with and separated from a limit switch provided at the opening of the housing. An arm having a long groove engagement that absorbs the distance between the dog and the door and restrains vertical displacement is provided between the door and the dog. This invention relates to a device for detecting the opening/closing operation of a sealed door.

As is well known, many industrial products are subject to erosion, nitriding,
Heat treatment such as dry baking or treatment within a closed housing such as vacuum sterilization is performed.

Naturally, the housing that performs the sealing process has an opening through which workpieces are taken in and out, but there are some types of doors that open and close in a swiveling manner to seal and open the opening. A side-sliding type was adopted due to the inconvenience of interfering with various nearby equipment and hindering the loading and unloading of workpieces.To solve this problem, the roller guide was made parabolic to create a sealed state when the door was closed. ing.

That is, for example, to explain an elevating type that can be opened and closed as shown in FIGS. A pressing part 5 along a parabola is formed at the lower part, a guide seal 7 is formed at the upper part with a straight part 6 parallel to the housing 1, and the door 8
It is raised and lowered to open and close via a roller 10 provided on a bracket 9 of the housing 1, and the lower end of the housing 1 is pressed to seal the housing 1 in close contact with a cushion seal 11 of the housing 1.

A dog 13 provided on an arm 12 fixed to the door 8 opens a limit switch 14 provided on the housing 1 to detect the opening/closing operation and perform the heat treatment operation.

Incidentally, the lifting and lowering is performed by a chain 15 via a hydraulic cylinder (not shown).

However, in the conventional mode described above, the dog 13 is also the door 8.
Since the movement follows the same motion trajectory as the 1st movement, even if the lifting/lowering detection is confirmed, it is difficult to detect the sealing or opening, and the detection function is inaccurate.As a result, the failure of the heat treatment furnace due to abnormality detection There were problems with the rules and the possibility of gas leaks.

In order to deal with this problem, it would be possible to adopt a detection method in the vertical direction and in the longitudinal direction, but this would make the mechanism complicated, increase costs, and make maintenance and inspection cumbersome.

The purpose of this invention is to solve the technical problem of the detection failure of the dog and micro switch for the parabolic action sealed door based on the above-mentioned conventional technology, and to provide a linear guideline for the housing fixed limit switch to slide the dog. On the other hand, the arm provided on the door is engaged with the dog in such a way that the vertical movement is freely absorbed through the long groove while being restrained in the vertical direction, thereby ensuring that the door can be slid open, closed, and sealed. It is an object of the present invention to provide an excellent device for detecting opening/closing operation of a closed door, which is capable of detecting opening and is useful for control applications in the work processing industry in closed housings.

The structure of this invention, which meets the above-mentioned purpose, is that when the door moves in parallel to the opening of the sealed housing and comes close to the door via rollers by a guide along a parabola, it moves in the vertical direction with respect to the door. The tip of the restrained arm is laterally movably engaged with a dog that is slidably engaged with a linear guideline extending along the opening on the side of the housing, and is moved downward, thereby closing the door. When the door is opened, the dog is brought into contact with the limit switch to detect the closing of the door and perform the specified control. When the door is opened, the dog rises along the guideline by the above-mentioned reverse operation, and the door opening limit switch is turned off to detect the specified opening. The gist is that technical measures have been taken to control the situation.

Next, one embodiment of this invention will be described below with reference to FIG. 4 and the subsequent drawings. Furthermore, 1st~
3. Parts of the same aspect as in FIG. 3 will be explained using the same reference numerals.

The closed housing 1 of the heat treatment furnace, its opening 2, and the frames 3 provided on both sides thereof in the vertical direction are substantially the same as the conventional embodiment shown in FIGS. 1 and 2, and therefore,
The guide 4, that is, the guide 4 of the guide rail 7, which is J-shaped and has a pressing proximal part 5 at the lower part and a straight part 6 parallel to the housing 1 at the upper part, has substantially the same mechanism. .

Similarly, the door 8 is raised and lowered via chains 15 and 15 by a hydraulic cylinder (not shown), and is raised and lowered with respect to the housing 1 at a predetermined interval, and is moved to the opening 2 by the guide rail 7. It is designed to be sealed.

A piano wire 16 as a parallel guideline is screwed onto the brackets 17, 17 from the top to the bottom of the opening in the housing 1 on the first side of the opening 2, so that the tension can be adjusted. A dog 13 has a receiving plate 18 welded to the center of the wire 16 and is adjusted with lock nuts 19, 19.
A hollow slider 20 having a screw threaded thereon is freely installed so that it can slide up and down.

Further, in the housing 1 outside the piano wire 16, there is an upper/lower limit switch 1 for detecting the opening/closing of the door 8.
4 and 14 are provided so as to be operated in contact with each other by the dogs 13' and 13'.

On the other hand, an arm 12' extends to the fixed side near the piano wire 16 on the first side of the door 8, and an L-shaped sub-arm 12'' is fixed to the tip of the arm 12'. is provided to form a fork groove 21' as a long groove,
Upper and lower plates 18' of the receiver 18 of the slider 20,
It is loosely engaged between 18' and 18'.

Therefore, the fork portion 21 moves up and down along with the receiver 18 to move up and down integrally with the door 8 via the arm 12' and the sub-arm 12''.
When the opening/closing motion of the opening portion 2 approaches or separates from the opening portion 2, the dogs 13', 13' are absorbed so that they do not move loosely and move laterally.

In the above configuration, when the door 8 is lowered by a hydraulic cylinder (not shown) via the chains 15, 15,
In the process from the parallel part 6 of the guide rail 7 to the lower J-shaped pressing part 5 via the rollers 10, 10, the door 8
approaches the cushion seal 11 of the opening 2.

In this process, the fork 21 is attached to the door 8 via the arm 12' and the sub-arm 12'' as described above.
It integrally moves from a linear movement to a close movement with respect to the housing 1.

Since the fork portion 21 is loosely engaged with the receiver 18 of the slider 20 and is loosely inserted into the tensioned piano wire 16 of the slider 20,
The proximal motion component of the parabolic motion of the fork portion 21 relative to the housing 1 moves relative to the receiver 18, so that the dogs 13', 13' move relative to the piano wire 16.
The slider 20 descends along the piano wire 16 due to the up-and-down movement component of the fork portion 21 being restrained in the vertical direction by the receiving plate 18.
When the door 8 comes into close contact with the cushion seal 11 of the opening 2, the lower end dog 13' comes into contact with the lower end limit switch 14, and as a result, the door 8 detects that it is closed.
Stop the lowering hydraulic cylinders of chains 15, 15,
Allow the heat treatment furnace to start operating.

Then, when the predetermined heat treatment is completed, the hydraulic cylinder is raised via a control device (not shown), and the door 8 is separated from the opening 2 and raised.

During this period, the horizontal backward movement component of the parabolic movement of the fork part 21 is absorbed by the relative sliding back of the fork part 21 with respect to the holder 18, and the prevention of lateral displacement of the dog 13' is absorbed by the engagement of the two. rises along the piano wire 16.

When the door 8 reaches the top dead center, the upper end dog 13' closes the upper end limit switch 14 at the set position, stops the retracting operation of the hydraulic cylinder, maintains the open state, and opens the workpiece (not shown). Loading and unloading from section 2 is carried out.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment. For example, the fork groove may be a long hole, or the slider may be provided with a link that can be freely rotated in the vertical direction and the link is connected to the door. Various configurations are possible, such as having a fork or a long groove loosely engaged with the arm of the guide, and the guideline is also made of another rail of piano wire, and the dog can be slid loosely engaged with the rail. It's okay.

Of course, the target closed housing is not limited to a heat treatment furnace.

As mentioned above, according to this invention, a detection device is provided in which a dog connected to an arm provided on a door that opens and closes in a parabolic manner with respect to an opening of a sealed housing contacts and separates from a limit switch. In this case, a linear guideline with a predetermined span is provided in the housing on the side of the opening, along with the limit switch, and the dog is loosely engaged, so that the dog slides linearly and reliably operates the limit switch. There are no malfunctions or operational errors with respect to the limit switch, the detection is performed accurately, and excellent effects such as door opening/closing control, deviations in workpiece loading/unloading timing, and gas leakage are prevented.

In addition, since the limit switch always approaches and leaves the dog in the set position, there is no risk of damage, and in addition to preventing the above-mentioned problems, it has excellent durability and does not break down, which reduces the need for maintenance and inspection. Ru.

Furthermore, the arm provided on the door and the dog are linked through vertical restraint and lateral displacement absorbing long groove engagement, so that even if the door makes a J-shaped parabolic movement as described above, Only the upward and downward components of the housing are transmitted to the dog, and the components moving toward and away from the housing are absorbed, which has the excellent effect of guaranteeing the linear motion of the dog.

In this way, the mutually advantageous operations of the dog and the door are utilized without any reduction, so there is an advantage that the functions and control functions of the housing are not hindered.

[Brief explanation of the drawing]

Figure 1 is a front view of a detection device based on the prior art;
Figure 2 is the same side view, Figure 3 is the surface view of the dog, Figure 4 is the same side view, Figure 3 is the surface view of the dog,
The figures below are explanatory diagrams of one embodiment of this invention, in which Fig. 4 is a front view, Fig. 5 is an enlarged side view of part A in Fig. 4,
FIG. 6 is a plan view of the same. 8...Door, 1...Housing, 10...Roller, 7...Guide, 13'...Dog, 14...Limit switch, 16...Guideline, 21'
...Long groove.

Claims (1)

[Scope of utility model registration request] An opening/closing operation detection device comprising a dog of the door, which is provided on a parabolic guide provided at the opening of the housing sealed by the door, so as to be able to be raised and closed via a roller, and a limit switch provided on the outside of the housing, A guideline is provided over a predetermined span from one side of the outside of the housing to the other, and the limit switch is provided along the guideline, and a dog is engaged and attached along the guideline so as to be movable up and down, and the door 1. An opening/closing operation detection device for a sealed door, characterized in that an arm is provided between the dog and the dog via a long groove engagement that restrains vertically and absorbs lateral displacement.