JPH024678Y2 - - Google Patents

Description

[Detailed description of the invention] a. Purpose of the invention (industrial application field) The tightening position detection device of the door tightening device for pressure vessels according to this invention is used to detect doors of pressure vessels whose interiors are under high pressure, such as steam sterilizers. is attached to the tightening position where it is tightened to the closed state, and is used to detect whether or not the tightening has been completed completely.

(Prior Art) The door of a pressure vessel such as a steam sterilizer must be firmly tightened when the vessel is sealed to prevent high-pressure water vapor introduced into the vessel from leaking to the outside. For this reason, door tightening devices as shown in FIGS. 3 and 4 have been widely known. First, this door tightening device will be briefly explained.

One end of the arm body 2 is pivotally attached to the front side of the main body 1, and the other end of the arm body 2 is pivotally attached to the front side of the door 3. A threaded cylinder 5 having a male thread carved on its outer peripheral surface is rotatably fitted onto a shaft 4 installed in the center of the front face of the door 3. A bracket 6 is coupled and fixed to this threaded cylinder 5 with bolts 7, and by rotating a handle (not shown) connected to this bracket 6, the threaded cylinder 5 can be fixed.
can be rotated around axis 4. A movable piece 9 having a screw hole 8 in the center is arranged around the screw cylinder 5.
are screwed together. This movable piece 9 can freely move toward and away from the front surface of the door 3 by rotating the screw cylinder 5, and there are a plurality of pieces (eight pieces in the illustrated example) on the periphery of the movable piece 9.
One end of the tightening rod 10 is pivotally locked. Near the tip of this tightening rod 10 is the door 3.
A frame-shaped guide piece 1 fixed to the front part near the outer periphery of
It is inserted through the inside of 1. An annular receiving fitting 13 having a substantially C-shaped cross section is fixed to the periphery of the opening 12 which is opened and closed by the door 3 equipped with such tightening rods 10, 10.

The operation of the door tightening device constructed in this way is as follows.

First, when tightening the door 3, the screw cylinder 5 is rotated to move the movable piece 9, which is away from the front surface of the door 3, in a direction closer to the front surface of the door 3, as shown in FIG. As a result, the tightening rod 10, whose one end is locked to the peripheral edge of the movable piece 9, swings from the state shown by the solid line in FIG. 4 to the state shown by the chain line in the left half of the figure, and each tightening The tips of the rods 10, 10 engage with the bracket 13 on the periphery of the opening, and the door 3 is moved into the opening 1.
Tighten it toward the packing 14 provided on the outer peripheral edge of 2.

When opening the door 3, the screw tube 5 is rotated in the opposite direction, the moving piece 9 is separated from the front surface of the door to the state shown in FIG. 4, and the screw tube 5 is further rotated a little. As a result, the movable piece 9 rotates a little around the shaft 4, and the tightening rods 10, 10 become slightly inclined from the radial direction as shown by the chain lines in FIG. comes out from inside the receiving metal fitting 11, and the door 3 can be opened.

By the way, such a door tightening device for a pressure vessel is provided with a tightening position detection device for detecting whether or not the door is completely tightened. This tightening position detection device detects the tightening position by utilizing the fact that when the door is tightened, the tightening rod 10 swings from the state shown by the solid line in the left half of FIG. 4 to the state shown by the chain line. It is constructed as shown in FIGS. 5 and 6.

That is, the push plate 1 fixed to the side of the tightening rod 10
A roller 17 pivotally attached to the tip of a push rod 16a of a micro switch 16 is brought into contact with the inclined surface 15a of the micro switch 16, and when the tightening rod 10 swings in the direction a in Fig. 6 when the door is tightened, The push rod 16a of the microswitch 16 is pushed in the direction b in the figure, and the microswitch 16 issues a signal indicating that the door has been completely tightened.

(Problems to be Solved by the Invention) However, the conventional tightening position detection device constructed and operated as described above has the following disadvantages.

That is, the guide piece 11 inserted through the tip of the tightening rod 10 tightens the opening area in order to tilt each rod 10, 10 in the state shown by the chain lines in FIGS. 3 and 5 when the door 3 is opened and closed. It needs to be larger than the cross-sectional area of the rod 10. For this reason, tightening rod 1
0 can wobble freely inside the guide piece 11, and when the door is tightened, the side surface 10a of the rod 10 opposite to the micro switch 16 does not always come into contact with the inner side surface 11a of the guide piece 11, making it difficult to detect the tightening position. The operation of the device becomes uncertain. For example, if the tip of the rod 10 engages with the holder 13 while the side surface 10a and the inner surface 11a are not in contact with each other, the both surfaces 10a,
11a remains in a state where it does not come into contact until the end, but in this state, even if the door is not completely tightened, the micro switch 16 will issue a signal indicating that the door has been tightened.

The object of the present invention is to solve this problem by providing a tightening position detection device for a door tightening device for a pressure vessel.

b. Structure of the invention (means for solving the problem) The tightening position detection device of the door tightening device of the present invention has a guide piece 11 into which the tip of the tightening rod 10 is loosely inserted.
A pressure pin is provided to press the tightening rod 10 in one direction, so that the positional relationship between the tightening rod 10 and the guide piece 11 is always constant when the door is tightened.

That is, as shown in FIG.
A presser 19 is inserted into a screw hole 18 formed on one side of the
The clamping rod 10 is pressed toward the inner surface 11a of the other side by a clamping pin 20 elastically protruding from the clamping device 19.

For example, as shown in FIG. 2, the depressor 19 has a compression spring 22 provided inside a cylinder body 21 having a male thread carved on its outer circumferential surface, which imparts elasticity to the depressing pin 20 in the direction of protruding from the cylinder body 21. It is screwed into the screw hole 18 on one side of the guide and fixed with a lock nut 23.

A push plate 15 as shown in FIGS. 5 and 6 is fixed to the tightening rod 10 in the same manner as in the prior art, and as the rod 10 swings, the push plate 15 pushes the push rod 16a of the limit switch 16. There is.

(Function) In the clamping position detection device of the pressure vessel door clamping device of the present invention constructed as described above, the clamping rod 10 used for clamping position detection is always connected to the pressure pin 2.
0, and the side surface 10a of the tightening rod 10 and the inner surface 11a of the guide piece 11 are about to come into contact with each other.

Furthermore, when the rod 10 attempts to tilt inside the guide piece 11 to the state shown by the chain line in FIG. It will be held in

c. Effects of the invention Since the tightening position detection device of the pressure vessel door tightening device of the present invention is configured and operates as described above,
The positional relationship between the tightening rod and the guide piece when the door is tightened is always constant, and the tightening position can be reliably detected without malfunction.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view showing a part of the tightening position detection device of the present invention, Fig. 2 is a sectional view of the pressurizer, Fig. 3 is a front view showing the door tightening device for a pressure vessel, and Fig. 4 3 is a sectional view taken along the line AA in FIG. 3, FIG. 5 is a partially enlarged view of FIG. 3 showing a conventional tightening position detection device, and FIG. 6 is a sectional view taken along the line BB in FIG. 1: Main body, 2: Arm body, 3: Door, 4: Shaft, 5: Threaded tube, 6: Bracket, 7: Bolt, 8: Threaded hole, 9: Moving piece, 10: Tightening rod, 10a: Side surface, 11: Guide piece, 11a: Inner surface, 12: Opening, 13: Receiver, 14: Packing, 15: Push plate, 15a: Inclined surface, 16: Micro switch,
16a: Push rod, 17: Roller, 18: Screw hole, 1
9: Pressure device, 20: Pressure pin, 21: Cylindrical body, 2
2: Compression spring, 23: Lock nut.

Claims (1)

[Scope of utility model registration request] A push plate fixed to the side of a tightening rod, whose one end is swingably locked to a movable piece that can move near and far from the front of the door, and which is loosely inserted into a frame-shaped guide piece whose tip is fixed near the front edge of the door. In a clamping position detection device for a door clamping device for a pressure vessel, which comprises a roller pivotally attached to the tip of a microswitch push rod, which is in contact with the inclined surface of 1. A tightening position detection device for a door tightening device for a pressure vessel, characterized in that one side of a tightening rod is elastically pressed toward one inner side of a guide piece by a pin.