JP4268089B2 - Airtight structure of gate switch - Google Patents

Description

  The present invention relates to an airtight structure of a gate opening / closing device installed in a waterway such as a water and sewage facility.

In general, the sewerage system is airtight, and almost no odor leaks to the outside. However, when a flow rate control gate is installed in the middle of the water channel, this gate is structured to move up and down via a feed screw mechanism by a ground switch, so the screw rod that constitutes the feed screw mechanism In addition, there is a problem that odor, corrosive gas, or moisture easily leaks into the switch or on the ground. Furthermore, if grease for reducing the friction of the feed screw falls into the water channel, it may contaminate the fluid in the water channel, which is a very big problem in water purification plants. In sewage pumping stations and treatment plants, the water level rises to the inside of the switch during heavy rains or typhoons, and the grease may come into contact with the water to emulsify and impair its function. In addition, since a special sealing process is not performed between the housing and the pedestal and between the pedestal and the slab, there is a possibility that fluid may be ejected from this, which is a sanitary problem. For this reason, the process which airtightly seals around a screw rod with the packing conventionally is performed (for example, refer patent document 1).
Japanese Utility Model Publication No. 62-33768 (Page 2, Fig. 2)

Conventionally, including Patent Document 1, the packing is installed in an underground gate chamber. However, there were the following problems when installing and maintaining the packing.
(1) Since the work takes into account the water in the channel, the work efficiency is poor and sufficient safety measures are required. (2) The work is difficult because the work is upward. (3) A ladder or other scaffolding is required. It is necessary to prepare (4) There is a risk of dropping packing or accompanying fixtures into the waterway

  The present invention has been created to solve the above-described problems, and an object thereof is to provide an airtight structure of a gate opening / closing device that can easily perform a packing installation operation.

  In order to solve the above-mentioned problems, the present invention has a housing installed on the ground, and is vertically moved by a feed screw mechanism that is suspended from the inside of the housing and connected to an underground gate, and a screw portion on the upper end side. In a gate opening / closing machine including a moving screw rod and a packing that is airtight around an axis on the lower end side of the screw rod, an airtight structure is provided in which the packing is positioned in the casing. According to the structure, the packing can be easily installed without considering the water in the water channel, and the work can be performed quickly because the work is not performed in an upward posture as in the conventional case. In addition, there is no need to provide a scaffold or the like, and the installation work on the ground part improves safety. Furthermore, the packing and the accompanying fixtures are not dropped into the water channel.

  Further, if the inspection window for inspecting the packing is provided in the casing, the maintainability of the packing is further improved.

  Further, if the bearing member supporting the lower end side of the screw rod and having the packing fitted therein is installed on the ground, the mounting structure of the bearing member inside the casing of the switch is simplified, and the switch Airtight structure with excellent assembly. Further, when the packing is installed, the operator is in a downward posture, so that workability is further improved.

  According to the present invention, it is possible to easily and safely install the packing without considering the water in the water channel.

  FIG. 1 is an explanatory side sectional view of a gate opening / closing device to which an airtight structure of the present invention is applied, and FIG. 2 is a detailed explanatory view around a packing. Reference sign S denotes a slab, and reference sign T denotes a mortar base laid on the slab S. The switch 1 includes a housing 2 that is installed on the ground (in this case, the pedestal T), and is connected to an underground gate G that is suspended downward from the inside of the housing 2, and has a screw portion on the upper end side. A screw rod 3 that moves up and down by a feed screw mechanism 5 via 3a and a packing 4 that hermetically seals the lower end side of the screw rod 3 (around the shaft barrel portion 3b) are provided. The gate G is installed in a water channel such as an upper water channel or a lower water channel, and left and right edges of the gate G are guided by a door stop (not shown) so as to be vertically movable.

  A female screw member 6 formed with a female screw is fitted inside the housing 2 so as to be rotatable about the axial direction of the screw portion 3a and immovable in the axial direction. The screw portion 3a is fitted to the female screw member 6. The above-described feed screw mechanism 5 is configured by being screwed to each other. When the female screw member 6 receives a driving force of a manual handle H or a motor M and rotates forward and backward via a transmission mechanism (not shown), the screw rod 3 moves up and down to raise and lower the gate G. As described above, the screw rod 3 is formed as the screw portion 3a on the upper end side and is an airtight portion in sliding contact with the packing 4 on the lower end side. Therefore, the screw rod 3 is formed as a shaft body portion 3b having a smooth peripheral surface. The shaft body portion 3b is inserted through a through-hole formed in the slab S and the pedestal T and is suspended underground, and the lower end thereof is connected to the gate G via a joint member (not shown).

  The packing 4 is formed in an annular shape, and seals the periphery of the shaft barrel portion 3b to block underground odors, corrosive gases, moisture, and the like from leaking into the inside of the switch or on the ground. The main feature of the present invention is that the packing 4 is positioned inside the casing 2, that is, positioned on the ground side. By providing the packing 4 inside the casing 2 of the switch 1 instead of underground as in the prior art, (1) the packing 4 can be easily installed without considering the water in the water channel. Since the work is not performed in an upward posture as in the case of (2), the work can be performed quickly. (2) There is no need to provide a scaffold or the like, and the installation work on the ground part improves safety. ) There is an effect that there is no problem of dropping the packing 4 and accompanying fixtures such as bolts into the water channel.

  In addition, as shown in FIG. 2, if it is set as the structure which provides the inspection window 7 for inspecting the packing 4 in the housing | casing 2, the maintainability of the packing 4 will improve more. The specific structure of the inspection window 7 is not particularly limited, and may be appropriately selected such as one having an open / close lid 7a having a known structure.

  In this embodiment, the packing 4 is attached to the bearing member 8. The bearing member 8 has a lower end side of the screw rod 3, that is, a bearing hole portion 8a for supporting the shaft body portion 3b, and a packing storage hole portion 8b for storing the packing 4 having a diameter larger than that of the bearing hole portion 8a. The bearing hole 8a forming side is fixed to the pedestal T so as to be placed on the ground (the pedestal T). The position of the packing 4 in the packing storage hole 8b that faces upward is held by applying the packing presser 9 from the upper side. The packing retainer 9 is fastened and fixed to the bearing member 8 in such a manner that a nut 11 is fastened to a bolt 10 implanted in the bearing member 8, for example. In the figure, the packing 4 has a three-layer structure.

  As described above, the structure in which the bearing member 8 is installed on the ground (the pedestal T) simplifies the mounting structure of the bearing member 8 inside the housing 2, and the airtight structure excellent in assembling performance of the switch 1. Become. Further, when the packing 4 is installed, the operator can perform in a downward posture, so that workability is further improved.

  The preferred embodiments of the present invention have been described above. However, the layout, shape, number, and the like of each component are not limited to those described in the drawings, and can be changed as appropriate without departing from the spirit of the present invention. It is.

It is side sectional explanatory drawing of the switch of the gate to which the airtight structure of this invention is applied. It is detailed explanatory drawing around packing in the airtight structure of this invention.

Explanation of symbols

G Gate 1 Switch 2 Housing 3 Screw rod 3a Screw part 4 Packing 5 Feed screw mechanism 7 Inspection window 8 Bearing member

Claims (3)

A chassis installed on the ground;
A screw rod that is suspended downward from the inside of the housing and connected to an underground gate, and moves up and down by a feed screw mechanism via a screw portion on the upper end side;
An airtight packing around an axis on the lower end side of the screw rod;
In the gate opening and closing machine equipped with
An airtight structure of a gate opening / closing device, wherein the packing is positioned in the casing.   2. An airtight structure for a gate opening / closing device according to claim 1, wherein an inspection window for inspecting the packing is provided in the casing.   The airtight structure of the gate opening and closing device according to claim 1 or 2, wherein a bearing member that supports a lower end side of the screw rod and in which the packing is fitted is installed on the ground.

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