JPH0726633Y2 - Rotary joint of rotary drum type cutting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a rotary joint of a rotary drum type cutting machine such as a road header.

(Prior art) Conventionally, in a rotary drum type cutting machine such as a load header, a rotary joint is installed between the drum and the machine body to prevent high pressure water from flowing from the machine body in order to cool the blade and prevent dust from being generated during cutting. Water was sent and high pressure water was sprayed from the drum to the tip of the blade by relaying from the fixed side to the rotating side with this rotary joint. This conventional rotary joint has a structure in which the channels provided therein are always in communication with each other, and water is constantly sprayed on all the blades.

The drum may be rotated in parallel with the cutting surface or may be rotated at a right angle. In the former one rotating in parallel with the cutting surface, high-pressure water is sprayed in parallel with the cutting surface, so that the rear ( It did not scatter to the aircraft side).

(Problems to be solved by the invention) However, when the latter is used for rotating the drum at a right angle to the cutting surface, the high-pressure water is scattered on the non-cutting side, that is, on the rear side of the machine, and the operator There is a problem in that half of the water used is wasted.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to spray water only on a cutting tool in front of a drum rotating in a direction perpendicular to the cutting surface. It is possible to provide a rotary joint that can prevent the water from being sprayed toward the uncut blade at the rear.

(Means for Solving the Problems) In the rotary joint of the rotary drum type cutting machine of the present invention, as means for achieving the above object, the rotary drum type cutting is performed by rotating the drum in the vertical direction with respect to the cutting surface for cutting. A rotary joint that is mounted between the machine frame and drum of a machine to relay high-pressure water that sprays on the blade from the fixed side to the rotating side, with the rear end side fixed to the machine frame and the shaft centered on the tip side. A fixed shaft having an insertion hole and a flow path communicating the flow path of the machine frame with the shaft insertion hole; a shaft rear end surface serving as a pressure receiving surface, a flow path penetrating in the axial direction, and a shaft rear end A floating sheet having a seal portion on its outer periphery and slidably inserted into the shaft insertion hole of the fixed shaft; and a space portion provided between the pressure receiving surface of the floating sheet and the shaft insertion hole of the fixed shaft. A pressurizing chamber formed; the floating A seal ring that is formed in a substantially upper half of the axial center of the sliding surface and that is fixed to the leading end surface of the floating sheet, the seal ring communicating with the flow path of the port; An urging means for urging the fixed shaft; a cylindrical portion rotatably fitted to the fixed shaft; and a plurality of flow passages fixed to the distal end side of the cylindrical portion and communicating from the rotation center portion to the outer peripheral surface. A casing which is formed of an end surface portion and which is attached to the rotary drum; fixedly attached to the center of rotation on the inner surface of the end surface portion of the casing and sealingly connected in a state of being in face-to-face contact with the seal ring, and communicating with the flow path of the end surface portion. A plurality of seal holes are provided on the sliding surface, and all the seal holes are evenly arranged on the same circumference, which pass through the notches of the seal ring one after another and communicate with each other when the casing rotates. And a seal.

(Operation) In the rotary joint of the rotary drum type cutting machine of the present invention, the flow path of the fixed shaft fixed to the machine frame and the flow path of the casing mounted on the rotation side are connected by a seal ring and an insert seal. Seals are rotatably connected in a face-to-face relationship. Further, the seal hole on the sliding surface of the insert seal is in a state in which the upper half of the rotation center of the casing communicates with the flow path of the fixed shaft due to the cutout portion of the seal ring.

Therefore, when the casing is rotating, the sealing holes arranged on the same circumference are always in the upper half of the fixed shaft and are communicated with the flow path of the fixed shaft. Only half of the high-pressure water nozzles provided are always supplied with high-pressure water from the fuselage, and the other half are in a non-supply state.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

First, the configuration of the embodiment will be described.

The rotary joint A of the rotary drum type cutting machine of this embodiment has a fixed shaft 1, a floating seat 2, a seal ring 3, a casing 4, and an insert seal 5, as shown in FIGS. 1 to 6. The coil spring 6 is a main component.

The fixed shaft 1 is to be fixed to a machine frame 7 mounted so as to rotate the rotary drum portion 72 at a right angle to the cutting surface 74, and a sliding hole 10 serving as a shaft insertion hole in the shaft center on the tip side. Is formed, and a second sliding hole 11 having a smaller diameter than the sliding hole 10 is formed on the inner side thereof.
Are formed. Further, a flow path 12 communicating with the second sliding hole 11 and opening at the rear end face is provided in the axial center. Further, a seal joint portion 13 for connecting and fixing to the machine frame 7 is provided on the rear end side of the fixed shaft 1. In the figure, 14 is a detent piece for the fixed shaft 1 and 70 is high pressure water provided on the machine frame 7.
71 supply routes.

The floating sheet 2 has sliding holes 10, 1 for the fixed shaft 1.
1, which is slidably inserted into 1 to bring the seal connecting portion 20 into close contact, and a sliding portion 21 having an outer diameter substantially the same as that of the sliding hole 10 of the fixed shaft 1 is provided on the tip side. On the rear end side, a second sliding portion 22 having an outer diameter substantially the same as that of the second sliding hole 11 is formed.
The second sliding portion 22 is provided with a seal portion 27 formed of an O-ring, and the rear end surface thereof is a pressure receiving surface 28. Further, a semicircular recess 23 is provided in the tip end in a substantially upper half from the shaft center, and a channel 24 communicating with the recess 23 and opening to the rear end face is provided in the shaft center. In addition, the second sliding portion 22 is inserted into the second sliding hole 11 of the fixed shaft 1, and the pressurizing chamber 25 is provided between the end faces of the second sliding portion 22.
The pressure receiving surface 28 of the sliding portion 22 is formed to be pressed. In addition, reference numeral 26 in the drawing denotes a detent piece of the floating sheet.

The seal ring 3 forms a seal connecting portion 20 together with the insert seal 5, and as shown in FIG. 4, the floating sheet is formed in a substantially upper half of the axis of the mirror-finished sliding surface 30. A semicircular notch 31 having the same shape as the recess 23 of the second sheet is formed, and is fixed to the center of the tip of the floating sheet 2 with the sliding surface 30 as the front surface.

The casing 4 is fixed to the rotary drum portion 72 of the rotary drum type cutting machine, and is formed of a cylindrical portion 40 and a circular end surface portion 41 that seals the distal end side of the cylindrical portion 40. Has been done. Further, the end face portion 41 has six discharge ports 42 on the outer peripheral surface.
The supply ports 43 are arranged at equal parts, and the supply ports 43 are provided at equal parts on the circumference of the inner surface of the end face part 41, which is the center of rotation of the inner surface of the end face part 41 and has a radius smaller than that of the circular part of the notch 31 of the seal ring 3. The supply port 43 and the discharge port 42 are communicated with each other through a flow path 44. The cylindrical portion 40 side is fitted to the fixed shaft 1 and is rotatably attached by a bearing 45. still,
In the figure, 46 is a drain passage, 47 is an oil seal, and 48 is a nut.

The insert seal 5 is to be brought into face-to-face contact with the seal ring 3, and, as shown in FIG. 3, on the concentric circle of the center of rotation of the sliding surface 50 finished to be a mirror surface, and to the supply port 43. Six sealing holes 51 are provided at the same position so that the sliding surface 50 faces the seal ring 3 side and
51 is fixed to the inner surface side of the end surface portion 41 with the supply port 43 aligned. Incidentally, as shown in FIG. 6, among the plurality of nozzles 73 attached to the rotary drum 72, half of the nozzles facing the cutting surface 74 and the seal holes 51 communicating with the nozzles always communicate with the notch 31 of the seal ring 3. Mounted as.

The coil spring 6 biases the floating seat 2 toward the seal ring 3 to apply an initial pressure to bring the seal ring 3 into close contact with the insert seal 5. 2 is mounted between the step portion 15 with the sliding hole 11 and the step portion 29 of the sliding portion 21 and the second sliding portion 22 of the floating sheet 2, and each step portion
It is formed to press 15,29.

Next, the operation of this embodiment will be described.

Since the rotary joint A of the rotary cutting machine according to this embodiment has the above-described structure, the high pressure water 71 supplied from the supply passage 70 of the machine frame 7 first passes through the passage 12 of the fixed shaft 1 to the second sliding hole. 11
To the pressure receiving surface of the floating sheet 2 in the pressure chamber 25.
28 is pressed to increase the degree of adhesion of the seal connecting portion 20 between the seal ring 3 and the insert seal 5, and reaches the recess 23 from the flow path 24. After that, as shown in FIG.
The high-pressure water 71 that has reached the point is supplied only to the seal holes 51 communicating with the cutout portion 31 (up to three in the embodiment), and the supply port 43 and the flow path 4
After passing through the discharge port 42 in this order, it is discharged toward the blade from a plurality of nozzles 73 facing the cutting surface 74 side. Then, when the rotary drum portion 72 is in a rotating state, the seal hole 51 becomes
The high-pressure water 71 is supplied through the seal holes 51 one after another, but since the nozzle 73 communicating with the seal hole 51 is also rotating together with the seal hole 51, the nozzle 73 for discharging the high-pressure water 71 always faces the cutting surface 74. It is limited to what was there. Therefore, the high-pressure water 71 is sprayed only on the cutting tool to cool the cutting tool and prevent dust from occurring. Further, water is not sprinkled on the rear cutting tool that has not been cut, so that the amount of water used can be saved, and the work of the operator is not disturbed.

Although the embodiment of the present invention has been described above with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like within the scope not departing from the gist of the present invention. Even included in the present invention.

For example, in the embodiment, the six seal holes 51 of the insert seal 5 are formed, but the number is not limited to this, and can be set arbitrarily according to the number of blades and the like.

Further, in the embodiment, the coil spring 6 is used as the urging means of the floating seat 2, and the step portion 15 of the sliding hole of the fixed shaft 1 is used.
Although it is assumed that it is mounted between the step portion 29 and the step portion 29 of the sliding portion of the floating sheet 2, the shape of the spring, the mounting position, etc. can be set arbitrarily.

Further, high-pressure water is sprayed to cool the blade and prevent dust, but the present invention is not limited to this, and can be used for crushing the cutting surface by adjusting the pressure, nozzle, and the like.

Further, as shown in FIG. 7, the flow path 24 of the floating sheet and the seal ring 3 may be provided eccentrically with respect to the axis.

(Effect of the Invention) As described above, the rotary joint of the rotary drum type cutting machine of the present invention has the above-mentioned configuration,
It is possible to spray the high-pressure water only on the blade during cutting of the rotary drum rotating in the direction perpendicular to the cutting surface to prevent cooling of the blade and generation of dust. Further, since water is not sprinkled on the uncut blade in the rear, water can be saved and the operator's work can be facilitated.

[Brief description of drawings]

1 is a sectional view showing a rotary joint of a rotary drum type cutting machine according to an embodiment of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a front view of the same insert seal, and FIG. 4 is a seal ring of the same. A front view, FIG. 5 is an explanatory view of the main part, FIG. 6 is an explanatory view showing the same usage state, and FIG. 7 is a front view showing another embodiment of the floating seat part. A: Rotary drum cutting machine rotary joint 1: Fixed shaft 2: Floating seat 3: Seal ring 4: Casing 5: Insert seal 6: Coil spring (biasing means) 7: Machine frame 10: Sliding hole (shaft insertion) 11) Second sliding hole (shaft insertion hole) 12: Flow path 20: Seal connecting part 24: Flow path 25: Pressurizing chamber 27: Seal part 28: Pressure receiving surface 30: Seal ring sliding surface 31: Notch 40: Cylindrical part 41: End face part 44: Flow path 50: Insert seal sliding surface 51: Seal hole 72: Rotating drum part

Claims (1)

[Scope of utility model registration request] 1. High-pressure water sprayed on a cutting tool by being mounted between a drum and a machine frame of a rotary drum type cutting machine for rotating a drum in a direction perpendicular to a cutting surface to relay it from a fixed side to a rotating side. And a fixed shaft having a rear end side fixed to a machine frame, a shaft insertion hole at a shaft center on the front end side, and a flow path communicating between the flow path of the machine frame and the shaft insertion hole. A floating sheet having a shaft rear end surface as a pressure receiving surface, a flow path penetrating in the axial direction, a seal portion on the outer periphery of the shaft rear end, and slidably inserted into the shaft insertion hole of the fixed shaft; A pressure chamber formed by providing a space between the pressure receiving surface of the floating sheet and the shaft insertion hole of the fixed shaft; and a substantially semicircular cutout portion communicating with the flow path of the floating sheet slides. The front end of the floating sheet formed in the upper half of the axis of the surface A seal ring fixed to the surface; an urging means for urging the floating sheet in the seal ring direction; a cylindrical portion rotatably fitted to the fixed shaft, and fixed to the tip side of the cylindrical portion. A casing formed of an end surface portion having a plurality of flow passages communicating from the rotation center portion to the outer peripheral surface and attached to the rotating drum; and a surface fixed to the rotation center on the inner surface of the end surface portion of the casing and facing the seal ring. Are sealed and connected, and a plurality of seal holes that communicate with the flow path of the end face are provided on the sliding surface, and all the seal holes pass through the notches of the seal ring one after another when the casing rotates and communicate with each other. A rotary joint for a rotary drum type cutting machine, comprising: an insert seal, which is evenly arranged on the same circumference.