JPH0412153Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a screw conveyor device that is installed in a pressure chamber on the face side and transfers earth and sand to the atmosphere side for transporting excavated earth and sand in the shield method. It is.

(Purpose of the invention) Conventionally, one end of a spiral plate (screw) was welded to the inner circumference of a short pipe supported by a copper alloy bearing metal.
In addition, to prevent dirt from entering through gaps around the bearing, there are well-known dirt conveying machines that have a drive device equipped with a urethane lip seal.
At the contact area between the lip surface of the seal and the shaft, as the frequency of use increases, the metal shaft side will wear unevenly, making it easier for dirt and sand to flow in from the depressed area, and causing damage between the lip and the shaft. Due to the intervening earth and sand, there are indentation scratches on the shaft side, and peeling and deterioration on the lip seal side progresses significantly, resulting in disadvantages such as damage to the copper alloy bearing metal, failure of the drive device, and shortened service life. Ta.

(Means for solving the problem) This project was completed with the aim of eliminating the above-mentioned drawbacks, and is based on a short metal tube with one end of a spiral plate of rectangular cross section welded to the shaft. None, the driven gear and the bearing inner ring whose outer surface is coated with carbide are connected with a joint pin, and the driving gear is placed on the outer circumference of the gear box holding the bearing outer ring whose inner surface is coated with carbide. A gear is installed, and its rotation is supported by the contact surfaces of the bearing inner ring and bearing outer ring.
In addition, a pressure oil port is provided in the gear box, and pressure oil is injected from the outside to lubricate the contact surfaces of the bearing inner ring and bearing outer ring and prevent dirt and mud from entering the bearing inside the helical plate. It is characterized by blocking.

(Operation and effect of the invention) Since the present invention is constructed as described above, a short metal tube to which one end of a spiral plate with a rectangular cross section is welded is swirled to fill a continuous spiral plate (screw). The sliding surface of the bearing inner ring whose outer surface is coated with carbide material and the bearing outer ring whose inner surface is coated with carbide material is in pressure contact with each other, and the sand is transferred from the pressure oil port. The pressure of the injected pressurized oil blocks the intrusion of earth and sand from the gaps around the short pipe, which increases the sealing effect and eliminates the need for urethane lip seals around the shaft of the short metal pipe. Therefore, uneven wear around the shaft is eliminated, and the machine life is extended without any failures over a long period of time. Furthermore, by coating and welding super-hard alloy material on the sliding surfaces of the bearings, there is no risk of dirt and sand abrasion, protecting the drive unit, reducing the number of parts used and downsizing the drive unit as a whole. can be achieved, and the economic effect is large.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, Fig. 2 is a cutaway side view of the vicinity of the bearing, and Fig. 3 is a cutaway side view showing the state of the sliding surfaces between the bearing inner ring and the bearing outer ring. . 1... spiral plate, 2... short tube, 3... driven gear,
4... Carbide material, 5... Bearing inner ring, 6... Bearing inner ring, 7... Joint pin, 8... Carbide material, 9... Bearing outer ring, 10... Bearing outer ring, 11... Gear box, 12
...Driver gear, 13...Pressure oil port.

Claims (1)

[Scope of utility model registration request] A short metal tube with one end of a spiral plate with a rectangular cross section welded to the shaft is used as a shaft, and on the circumference, a driven gear and a bearing inner ring whose outer surface is coated with carbide are connected with a joint pin.
On the outer periphery, a driving gear is mounted on a gear box that holds an outer bearing ring whose inner surface is coated with carbide material, and its rotation is supported by the contact surfaces of the inner bearing ring and the outer bearing ring.
The earth and sand conveyor is characterized in that the gear box is provided with a pressure oil port for lubricating the bearing inner ring and the bearing outer ring and for preventing conveyed sewage from entering the bearing.