JPH028562A - Opening and closing device for manhole cover plate - Google Patents

Abstract

PURPOSE:To facilitate operation by providing in an opening and closing device a movable arm having a cover plate-mounting and removing means in the point end and an arm driving means driving the movable arm. CONSTITUTION:A turnable vertical shaft 40 is mounted to a bracket 39 in the upper end of a strut 38, and fixing the rear end of a movable arm 41 to this vertical shaft 40, the movable arm 41 can be driven by a rotary actuator 44 serving as the arm driving means. A vertical cylinder 42 is fixed to the movable arm 41 in its point end, and mounting a base plate 43 of a cover plate mounting and removing means A to the bottom part of a connecting case 49 vertically moved by the cylinder 42, a vertical positioning pin 45, cover plate control shaft 46 and a pinion drive shaft 47 are mounted to this base plate 43. Thus a cover plate 10, removed from a manhole 5, is placed in a position with no interference with charge and discharge of a raw material or the like so that its charging and discharging operation is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic opening/closing device for a manhole cover plate provided in various tanks such as a rotary pressure tank.

[Prior Art] During the manufacturing process of foods, etc., these raw materials are sometimes placed in a pressure tank and subjected to steam processing.

The pressure tank used for steam processing as described above has a manhole for inputting and discharging raw materials, but the attachment of a cover plate that closes this manhole is generally performed manually.

For example, a structure in which the flange of the manhole and a flange provided on the cover are tightened and fixed with a large number of tightening bolts and nuts, or inward claws at the bottom of both ends of the lever extending left and right from the top of the cover plate. Engage with the lower side of the flange of the manhole, press the lower end of the tightening bolt screwed into the screw hole in the center of the lever against the center of the cover plate, turn the bolt using the handle attached to the upper end of the bolt, and tighten the lower end of the bolt into the cover plate. There is one in which the flange around the cover plate is pressed against the flange of the manhole by pressing it against the plate.

[Problem to be solved by the invention]

Among the conventional techniques mentioned above, the first method using a large number of tightening bolts is very reliable, but the installation and removal of the cover plate takes a lot of effort and takes a long time. There is a problem.

In addition, the second method of using a tightening tool consisting of a lever with inward claws at both ends and one tightening bolt is superior in that it simplifies work and saves labor, but it has problems with pressure resistance. However, there is a problem that it cannot be used according to the Ministry of Labor's pressure vessel structural standards.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention aims to provide a device that can fully automatically attach and detach a cover plate and tighten and open the cover plate without requiring human labor. be.

Means for solving C21 and B] In order to achieve the above object, the present invention includes a movable arm having a cover plate detaching means for attaching and detaching a cover plate of a manhole of a tank, and a movable arm that drives the movable arm. An arm drive means for moving the cover plate attachment/detachment means from above the manhole. It is composed of a claw plate driving means that engages the claw receiving holes of the left and right claw receiving plates from a position parallel to the left and right claw receiving plates, and further, the above-mentioned detachment means drives a sealing device provided on the manhole and the cover plate. In addition, the sealing means is provided with a sealing device driving means that fixes a sealing ring having a lower surface that comes into close contact with the upper surface of a flange fixed to the outer periphery of the upper end of the peripheral wall of the manhole to the outer periphery of the lid, and A soft elastic ring-shaped packing that tightly contacts the upper surface of the manhole flange is fitted into the formed dovetail groove, and a plurality of outward facing pieces are formed at appropriate intervals on the outer periphery of the flange, and the sealing ring is rotatably attached to the outer periphery of the sealing ring. The lower inner periphery of the ring is provided with a plurality of inward pieces that pass between the outward pieces of the flange and are positioned below the outward pieces when the sealing ring is placed on the flange. The lower surface and the upper surface of the inward piece are provided with slopes so that when the tightening ring is turned relative to the flange, the inward piece is pushed into the lower part of the outward piece by a wedge action, and the sealing ring is pressed against the flange together with the tightening ring. It is something.

[Effect]

Since this invention has the above-mentioned configuration, the movable arm is moved to move the cover plate attachment/detachment means onto the cover plate that closes the manhole, and the claw plate of the detachment means is moved between the left and right claw receiving plates of the cover plate. put in.

Finally, rotate the tightening ring that connects the manhole and cover plate in the opposite direction to release the connection between the manhole and m+ffl.

After releasing the connection between the manhole and the cover plate in this way, the claw plate is rotated so that both ends thereof are engaged with the claw receiving holes of the left and right claw receiving plates on the M plate, and when the claw receiving plates are raised, the cover plate rises away from the manhole. As described above, the movable arm is rotated with the lid plate lifted by the lid plate attachment/detachment means to a position where there is no problem in loading and discharging raw materials.

The operation for attaching the cover plate to the manhole is the reverse of the above operation.

[Embodiment] In FIGS. 1 and 2, reference numeral 1 designates a horizontal cylindrical pressure tank with both ends sealed, and shafts 2 at both ends of the tank are rotatably supported by bearings 4 provided on a frame 3.

In FIG. 3, reference numeral 5 indicates a manhole provided in the body of the tank 1, and reference numeral 6 indicates a peripheral wall thereof, and the francif is integrally fixed to the upper outer periphery of the peripheral wall 5.

Reference numeral 10 denotes a cover plate, around which the sealing ring 11 of the sealing device B placed on the flange 7 is fixed.

A dovetail groove 9 is provided on the lower surface of the sealing ring 11 all around the circumference, and a rubber ring-shaped gasket 1 such as an O-ring is inserted into the dovetail groove.
2 is fitted, and when the sealing ring 11 is placed on the flange 7, the packing 12 is brought into close contact with the upper surface of the flange 7 to maintain airtightness.

A plurality of outwardly directed pieces 13 are integrally formed on the upper part of the outer periphery of the flange 7 at regular intervals, and the same number of outwardly directed pieces 14 are integrally formed on the middle part of the outer periphery of the sealing ring 11 at regular intervals. Each recess formed on the top surface has a sliding plate 1.
5 is press-fitted and fixed.

18 is a tightening ring rotatably attached to the outer periphery of the sealing ring 11, and its upper inward edge 19 rests on the sliding plate 15;
A plurality of steel balls 20 are arranged between the inner periphery of the inward edge 19 and the outer periphery of the sealing ring 11 to ensure smooth rotation of the ring 18.

Further, the flange 7 is provided at the lower part of the tightening ring 18.
A plurality of inwardly directed pieces 21 are provided with a width and interval that can pass between the respective outwardly directed pieces 13, and a sliding plate 22 is press-fitted and fixed into each of the plurality of recesses provided on the upper surface of the inwardly directed pieces 21.

As shown in FIG. 3, a plurality of positioning plates 23 are vertically fixed to the outer circumferential portion of the lower surface of the cover plate 10 to fit inside the peripheral wall 6 of the manhole 5, and within the peripheral wall 6, stoppers 24 of the positioning plates 23 are fixed. is provided to prevent the cover plate 10 from rotating.

A plurality of positioning cylinders 27 are arranged and fixed on the outer periphery of the upper surface of the M temporary 10, and the inner circumference of the upper end thereof is a tapered surface 28.
As shown in FIG.
A claw receiving hole 30 is formed in each plate 29.

Further, a vertical shaft 31 is fixed to the outer periphery of the upper surface of the cover plate 10, and a pinion gear 32 is rotatably mounted on the outer periphery of this shaft 31 via a bearing, and the shaft of the gear 32 is attached to the outer periphery of the lid plate 10 by means of a collar and a snap ring. Prevent directional movement.

A concentric peripheral wall 33 is provided on the upper part of the pinion gear 32, and a plurality of notches 34 as shown in FIG. 4 are formed in this peripheral wall 33.

An internal gear 36 that meshes with the pinion gear 32 is fixed to a part of the upper surface of the tightening ring 18.
6 may not cover the whole circumference as shown in FIGS. 6 and 7, but may be a part of the circumference.

In FIG. 1, reference numeral 38 denotes a column erected on the side of the frame 3, and a rotatable vertical shaft 40 is attached to a bracket 39 at the upper end of the column.
is attached, and the rear end of the movable arm 41 is fixed to this shaft 40, and a low reactor actuator 44 is installed as an arm driving means.
The arm 41 is driven by.

The tip of the arm 41 extends over the manhole of the tank 1, and a vertical cylinder 42 is fixed to the tip.

A base plate 43 of the M plate attachment/detachment means A is attached to the lower part of the connecting case 4 which is moved up and down by the cylinder 42, and this base plate 43 has a vertical positioning pin 45 as shown in the third article.
, a cover plate operation shaft 46, a pinion gear drive shaft 47, etc. are attached.

The positioning pins 45 are connected to each positioning cylinder 2 on the 1M plate 10.
7, and the lower end of the pin 45 has a tapered surface 48 that matches the tapered surface 28 of the cylinder 27.

The connecting case 49 and the Heath temporary 43 are connected so that they can move vertically and horizontally within a certain range, and a row rear actuator as a claw plate driving means is installed inside the connecting case 49 so as to be able to swing within a certain range. At 50, the cover plate operating shaft 46 is driven.

The shaft 46 and the lid plate 1 are connected under the condition that the tapered surface 48 at the lower end of each pin 45 matches the tapered surface 28 of each part 27 on the lid plate 10.
0 and the lower end of the shaft 46 is placed between the claw receiving plates 29.

Further, a claw plate 51 is fixed to the lower end of the operating shaft 46, and the claw plate 51 has both ends engaged with and disengaged from the claw receiving hole 30.

Further, the pinion gear drive shaft 47 is connected to the shaft 31 on the M plate 10 under the condition that each positioning cylinder 27 and each positioning pin 45 are aligned.
It is driven by a motor or rotary actuator 52 as a sealing device driving means, which is provided at a position concentric with the base plate 43 and fixed on the base plate 43.

A coupling 53 is fixed to the lower end of the shaft 47. This coupling 53 is connected to the peripheral wall 3 on the pinion gear 32.
3, and the inside thereof is provided with a plurality of pins 54 that engage and disengage from each notch 34 of the peripheral wall 33, as shown in FIG.

56 in FIG. 1 is a raw material hopper installed above the tank 1;
A discharge pipe 57 is swingably attached to the lower part of the hopper 56 and is operated by a cylinder 58.

The lid plate 10 is connected to each positioning plate 2 as shown in FIGS. 3 and 6.
3 has entered the peripheral wall 6 and is in an accurate position by the stopper 24, if each inward piece 21 of the tightening ring 18 is pushed under each outward piece 13 of the flange 7, The inner edge 19 of the clamping ring 18 presses down on the outer piece 14 so that the upper surface of the flange 7 and the sealing ring 11
It is in close contact with the lower surface of the ring, and the ring-shaped packing 12 maintains complete airtightness.

When the MviIO is in the above state, the arm 41 rotates over the tank 1 as shown in FIGS. When the base plate 43 is lowered by the action of the cylinder 42 under the conditions that At the same time, the camp ring 53 covers the peripheral wall 33 and each pin 54 engages with each notch 34.

During the above-mentioned coupling operation, some misalignment between the tube 27, the bottle 45, and the coupling 53 is absorbed by the slight movement of the connecting case 49 and the base plate 43.

Further, in the above case, since the claw plate 51 is parallel to the left and right claw receiving plates 29 as shown by the chain line in FIG. 6, the claw plate 51 fits between the drawing plates 29 without any problem.

Next, actuate the rotary actuator 52 to
When the pinion gear 32 is rotated counterclockwise through the coupling 53 in the loosening direction, that is, toward the direction shown in FIG. Each inward piece 21 is moved to the side of each outward piece 13 to release each outward piece 13 from being pushed up.

When each inward piece 21 moves between the outward pieces 13 by the above operation, the row reactor 52 is stopped.

Next, when the cover plate operating shaft 46 is rotated 90" by the row reactor 50, the left and right pawl receiving plates 29
Both ends of the claw plate 51, which were parallel to each other, fit into the claw receiving hole 30 as shown in FIGS. 3 and 6.

When the cylinder 42 is operated in the above state and the base plate 43 is raised, the lid plate 10 is lifted by the claw plate 51.

At this time, since each inward facing piece 21 passes between each outward facing piece 13, the tightening ring 18 rises together with the cover plate 10, and the manhole 5 is opened.

Next, the arm 41 is rotated by the actuator 44,
As shown in FIG. 2, the removed cover plate 10 and the tightening ring 18 are placed on standby at the position indicated by the chain line a.

With the manhole 5 open as described above, the discharge pipe 5
7 is tilted downward and a fixed amount of raw materials such as grains are introduced into the tank 1 through the manhole 5.

Under the condition that the injection is completed, the arm 41 is returned to the position shown by the solid line in FIG. and close manhole 5.

When the cover plate 10 is lowered as described above, the inward piece 21 of the tightening ring 18 on its outer periphery passes between the outward pieces 13 of the flange 7 and descends.

In this state, when the low reactor 52 is activated and the pinion gear 32 is turned in the tightening direction, the internal gear 36
, the tightening ring 18 rotates in the tightening direction, that is, in the right direction in FIG.
The clamping ring 18 presses the sealing ring 11 onto the flange 7 accordingly.

In order to smoothly push each inward piece 21 into the lower side of the outward piece 13 as described above, as shown in FIG. Board 2
It is preferable to form the opposite sides of 2 into slopes (a) and (b).

Further, each sliding plate 15, 22 is preferably made of a material with good sliding properties, such as a polytetrafluoroethylene synthetic resin.

Under the condition that the cover plate 10 completely closes the manhole 5 as described above, the actuator 50 operates and moves the operating shaft 46 by 90 degrees.
By turning the screw plate 51, both ends of the pawl plate 51 are removed from the pawl receiving hole 30 and become parallel to the left and right pawl receiving plates 29.

Next, the cylinder 42 is operated to raise the base plate 43, and the actuator 44 returns the arm 41 to the standby position, and in this state, the raw material in the tank 1 is steamed for a certain period of time.

When the steaming is finished, the pressure inside the tank 1 is released, the lid plate 10 is removed again using the above procedure, and the tank 1 is turned to the standby position, and then the tank 1 is rotated 180 degrees so that the open manhole 5 faces downward and the steamed water is removed. The raw material is discharged onto a conveyor 60 and transported to a predetermined location.

Although the embodiment described above is applied to a rotary pressure tank, it can also be used as an opening/closing device for manhole cover plates of various tanks other than the tank shown in the embodiment.

[Effects of the Invention] As described above, the present invention includes a movable arm having a cover plate detaching means for attaching and detaching a cover plate of a manhole of a tank at its tip, and a movable arm having a cover plate detaching means for attaching and detaching a cover plate of a manhole of a tank, and a movable arm that drives the movable arm to attach and detach the cover plate detachable means from above the manhole. Since the lid plate is removed from the manhole, it can be placed in a position where there is no problem in loading and unloading raw materials, etc., and it can be used to load raw materials into the tank with the manhole facing upwards, or with the manhole facing downwards. Operations such as discharging the raw materials in the tank can be easily performed.

The lid plate attachment/detachment means includes a pawl plate that descends between the left and right pawl receiving plates on the lid plate, and rotates this pawl plate to move the left and right pawl receiving plates from a position parallel to the left and right pawl receiving plates. Since it is constructed with a claw plate drive means that engages with the claw receiving hole, the cover plate can be connected to or separated from the movable arm simply by rotating the claw plate, making it extremely easy to attach and detach the cover plate. Easy and reliable.

Furthermore, the sealing means fixes to the outer circumference of the lid a sealing ring having a lower surface that comes into close contact with the upper surface of the flange fixed to the outer periphery of the upper end of the peripheral wall of the manhole. A plurality of outward facing pieces are formed at appropriate intervals on the outer periphery of the flange, and a lower inner periphery of the tightening ring rotatably attached to the outer periphery of the flange is fitted with a soft elastic ring-shaped packing that tightly contacts the flange. When the sealing ring is placed on the flange, a plurality of inward pieces are provided that pass between each outward piece of this flange and are positioned below the outward piece, and the lower surface of the outer piece and the upper surface of the inward piece are provided with a plurality of inward pieces that pass between the outer pieces of the flange. On the other hand, when the tightening ring is turned, the inward facing piece is pushed into the lower part of the outward facing piece by a wedge action, and the sealing ring is tightened because it has a slope that causes the sealing ring to be crimped to the flange together with the tightening ring. Just by turning it in the opposite direction, the airtightness between the cover plate and the manhole is maintained completely, providing sufficient pressure resistance. Furthermore, simply by turning this tightening ring in the opposite direction, the connection between the cover plate and the manhole is released, so that the cover plate can be easily attached and detached.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a plan view of the same as above, Fig. 3 is an enlarged vertical sectional front view of the main part, and Fig. 4 is an enlarged development showing a part of the coupling part. 5 is an enlarged developed sectional view of the sealing device, the sixth is an enlarged cross-sectional view of the sealing device, and FIG. 7 is an exploded perspective view of the same. 1... Pressure tank, 5... Manhole, 6... Peripheral wall, 7... Flange, S... Dovetail groove, 10...・・・
... Lid plate, 11 ... Sealing ring, 12 ... Ring-shaped gasket, 13.14 ... Outward piece, 18 ... Tightening ring, 21 ...Inward piece, 29...Claw receiving plate, 30...Claw receiving hole, 41...Movable arm, 43...Base plate , 44.50.52...Rotary actuator, 51...Claw plate, A...
・Lid plate attachment/detachment means, B...Sealing device, (A), Same

Claims (2)

[Claims] (1) Consisting of a movable arm having at its tip a cover plate detaching means for attaching and detaching a cover plate of a manhole of a tank, and an arm driving means for driving the movable arm to move the cover plate detaching means from above the manhole; The lid plate attachment/detachment means includes a pawl plate that descends between the left and right pawl receiving plates on the lid plate, and a pawl plate that rotates to remove the pawl holder of the left and right pawl receiving plates from a position parallel to the left and right pawl receiving plates. Comprised of a claw plate driving means that engages with the hole,
Furthermore, the opening/closing device for a manhole cover plate is characterized in that the attachment/detachment means is provided with a sealing device drive means for driving a sealing device provided on the manhole and the cover plate. (2) The above sealing means has a sealing ring fixed to the outer periphery of the lid, the lower surface of which is in close contact with the upper surface of the flange fixed to the outer periphery of the upper end of the peripheral wall of the manhole. A soft elastic ring-shaped packing that tightly contacts the upper surface of the flange is fitted, a plurality of outwardly facing pieces are formed at appropriate intervals on the outer periphery of the flange, and the lower inner periphery of the tightening ring is rotatably attached to the outer periphery of the sealing ring.
When the sealing ring is placed on the flange, a plurality of inward pieces are provided that pass between each of the outward pieces of the flange and are positioned below the outward pieces, and the lower surface of the outer piece and the upper surface of the inward piece are provided with a plurality of inward pieces. Claim 1 characterized in that, when the tightening ring is rotated with respect to the flange, a slope is provided for pushing the inwardly directed piece into the lower part of the outwardly facing piece by a wedge action so as to press the sealing ring to the flange together with the tightening ring. The opening/closing device for the manhole cover plate described.