JPS6233825Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a drive shaft connection device for an excavator.

The excavator houses a cutter head, a trough pipe that reaches the cutter head, and a screw that is located within the trough pipe and forms a screw conveyor with the trough pipe, in an element having a rectangular or trapezoidal cross-sectional shape. Then, the earth and sand excavated by the cutter head is sent backwards by a screw conveyor and discharged.

In the above-mentioned excavator, the present invention is such that the screw drive shaft is formed into a cylindrical shape, a cutter drive shaft is provided in the hollow part of the screw drive shaft, and the two shafts are rotated separately to drive the screw and cutter separately. This was done with the purpose of making it possible to connect the drive shaft easily and reliably when the screw drive shaft is in the form of a hollow screw drive shaft and a cutter drive shaft inserted into the hollow part of the screw drive shaft. In a drive device for an excavator that is driven separately, a cylindrical protrusion with a non-circular cross section is provided in the middle of the screw drive shaft at one end of one of the shafts to be joined, and the protrusion is provided on the other shaft to be joined. and an opening provided to fit into the cutter drive shaft, and a protrusion with a non-circular cross section provided at one end of the shaft to be joined in the middle of the cutter drive shaft, and the other shaft to be joined. a joint portion consisting of the protrusion and an opening provided to fit into the protrusion;
The invention is characterized in that either one of the screw drive shafts and cutter drive shafts to be connected can be extended or contracted, and the telescoping portion is equipped with a spring that always acts in a direction to extend the shaft. It is something.

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show an outline of the excavator used to carry out the present invention. A clamping device 5 for removably connecting elements 4 having a rectangular or trapezoidal shape is provided, the end of the element 4 is attached to the clamping device 5, and the element 4 is attached to the clamping device 5.
A cutter head 6 is stored at the tip of the cutter head 6, and a trough pipe 7 that reaches the cutter head 6 and a screw 9 that is inside the trough pipe 7 and constitutes a screw conveyor 8 with the trough pipe 7 are stored in the element 4, The screw drive shaft 10 of the screw 9 is formed into a cylindrical shape, and the cutter drive shaft 11 is inserted into the hollow part of the screw drive shaft 10.
Joint parts 12 and 12' are provided in the middle of each shaft, and the joint ends of both shafts can be connected at the joint parts 12 and 12'.

The screw drive shaft 10 connects a front screw drive shaft 10a with screw blades 13 fixed to the outer periphery and an intermediate screw drive shaft 10b at a joint 12.
The intermediate screw drive shaft 10b is connected to the cylindrical body 14 by a flange joint 15, and the cylindrical body 14 is connected to one end of the cylindrical screw rotation output shaft 16, which is the rear screw drive shaft, by a spline. 17
They are connected so that they can slide in the axial direction but not in the circumferential direction. The cutter drive shaft 11 connects the cutter drive shaft 11a on the front side and the cutter drive shaft 11b on the intermediate side at a joint 12', and connects the cutter drive shaft 11b on the intermediate side to the cutter rotation output shaft 18 which is the cutter drive shaft on the rear side. It is connected to one end with a spline 19 so that it can slide in the axial direction but not in the circumferential direction.

Next, to explain the structure of the joint parts 12 and 12' of the screw drive shaft and the cutter drive shaft, at one end (front end) of the screw drive shaft 10b on the intermediate side, there is a cylindrical hexagonal shaft 20 with a hexagonal cross section, for example. A hexagonal recess 21 on the inner surface that fits with the hexagonal shaft 20 is provided at the rear end of the front screw drive shaft 10a.
A spring 22 is provided at the connection point (extendable part) between the cutter drive shaft 10b on the intermediate side and the screw rotation output shaft 16, which always acts in a direction to extend the screw drive shaft 10b on the intermediate side. The hexagonal shaft 23 has a hexagonal cross-sectional shape and is rotatably inserted into the hollow part of the cylindrical hexagonal shaft 20. The end of the hexagonal shaft 23 is fixed to the front side. provided at the rear end of the cutter drive shaft 11a, and the cutter drive shaft 11b on the intermediate side.
A spring 25 is provided at the connection point (expandable portion) between the cutter rotation output shaft 18 and the cutter rotation output shaft 18, which always acts in a direction to extend the cutter drive shaft 11b on the intermediate side.

Also, oil is injected into the hollow portion 26 of the screw drive shaft 10 (the oil level is indicated by 27) to create an oil bath state. 28, 29, 30, and 31 are oil seals.

The screw rotation output shaft 16 and the cutter rotation output shaft 18 can be separately driven by hydraulic motors 32 and 33.

In the figure, 34 and 35 are stoppers for the screw drive shaft 10b on the intermediate side, 36 and 37 are stoppers for the cutter drive shaft 11b on the intermediate side, and 38 is a gear case housing a worm gear that transmits the rotation of the cutter drive shaft 11 to the cutter arm 39. 40,4
1 and 42 are bearings, and 43 is a soil discharge port.

In the above embodiment, when joining the screw drive shaft 10 and cutter drive shaft 11, the screw rotation output shaft 16 and cutter rotation output shaft 18 are rotated and moved in the direction of the arrow X, and the hexagonal shafts 20, 23 are moved. Fits into each recess 21, 24. At this time, if the outer surface shape of the hexagonal shaft 23 and the inner surface shape of the recess 24 do not match, the hexagonal shaft 23 cannot fit into the recess 24, and therefore the middle cutter drive shaft 11b is thrust in the direction of arrow Y. Although a force is applied, the spring 25 bends and absorbs this force. Since the hexagonal shaft 23 is rotating, the hexagonal shaft 23 eventually comes to completely align with the opening of the recess 24 and is fitted into the recess 24 by the force of the spring 25, so that the cutter drive shaft 11 is in the connected state. The hexagonal shaft 20 provided on the screw drive shaft 10 is also fitted into the recess 21 in the same manner as described above. An oil bath works effectively as a measure to prevent dirt from entering the inside of the connection device.

It should be noted that the present invention is not limited to the above, and for example, the shape of the recess of the joint and the shape of the protrusion that fits into the recess can be changed in various ways as long as the rotational force can be transmitted, without otherwise changing the gist of the invention. Of course, it can be implemented with appropriate changes within the range.

According to the present invention having the above configuration, (i) Even if a sudden thrust force is applied to the shaft at the time of connection, the spring absorbs this, so that the drive shaft can be connected easily and reliably.

(ii) If an oil bath method is adopted, the intrusion of earth and sand can be prevented and the life of the equipment can be extended.

It can produce excellent effects such as

[Brief explanation of the drawing]

FIG. 1 is a side view showing an outline of the excavator, FIG. 2 is an explanatory view of the cutter head seen from the direction of FIG. 1, and FIG. 3 is a sectional view showing an example of the present invention. 10... Screw drive shaft, 11... Cutter drive shaft, 12, 12'... Joint portion, 16... Screw rotation output shaft, 18... Cutter rotation output shaft, 20, 23... Hexagonal shaft, 21, 24 ... recess, 22, 25 ... spring.

Claims (1)

[Scope of utility model registration request] In an excavator drive device in which a hollow screw drive shaft and a cutter drive shaft inserted into the hollow part of the screw drive shaft are driven separately, one of the shafts to be joined is inserted in the middle of the screw drive shaft. A joint part consisting of a cylindrical protrusion with a non-circular cross section provided at the end and an opening provided on the other shaft to be joined to fit with the protrusion is provided, and also in the middle of the cutter drive shaft. A joint portion consisting of a protrusion with a non-circular cross section provided on one end of the shaft to be joined, and an opening provided on the other shaft to be joined so as to fit with the projection, and the screw drive shaft and the cutter A drive shaft connection device for an excavator, characterized in that one of the shafts to be joined of the drive shafts is expandable and retractable, and the telescoping portion is equipped with a spring that constantly acts in a direction to extend the shaft. .