CZ2002447A3 - Digging cutter for mounting in water-cooled digging head - Google Patents

Abstract

Rubbing knife (1) to fit into water-cooled head it consists of a darkness (2) and a front part (3) provided with an opening to store the darkening head. At the pressurized water inlet (7) In the darkness (2) of the knifing knife follow the guide (20,15, 16) pressurized water connected to the pressurized water inlet. In the hole (8) on the front part (3) in the water line outlet (9) is arranged discharge nozzle. Stuffing Hole (10) intersects the pressurized water line (16) and the gland (10) there is provided a stopper (11A) which is either provided Through or Blind (11B).

Description

Rubbing knife for storage in water-cooled rubbing head

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a milling cutter to be placed in a milling head of an ore milling head which is operable on a milling machine for ore mining operations, i.e. for mine rocking in underground decking or tunneling leveling of road surfaces during maintenance.

BACKGROUND OF THE INVENTION

All die mandrels, whether made as steel castings or forgings, are provided with a hole in their front part for removable bearing of the head mandrel sleeve or directly of the mandrel as support for the bearing mandrel support mandrel but this hole weakens the cross-section of material also the strength of the mandrel, so that inevitably its weakened region arises. As a result, the mandrel is also destroyed under extreme operating conditions, for example upon impacting hard rock or by accidental impact on a metal object, for example on a vault beam, anchoring layers and the like.

Taking further into account the circular support mandrels of the milling cutters and thus also the circular holes in the milling cutter, the angle of adjustment of the mandrel on the rotatable cutting head contributes to the vulnerability of the milling cutter. By arranging the sleeve between the knife and the support mandrel, it further reduces the cross-section of the remaining head material. In addition, according to current developments, so-called wet systems are used in the construction of bushings, in which water is supplied via internal guides in the knife. Again, these guides reduce the structural strength of the blades.

In addition to wear, wet head formations are generally prone to pressure loss in the system. As soon as the cutting knife breaks, either pressure loss or internal blockage of the debris occurs.

While a rotary head or drum of a milling machine may have 50 or more mowing blades, breaking one or two mowing blades does not significantly impair cutting efficiency, and in practice the use of the milling head and blades is continued until scheduled maintenance is achieved, as broken blades require that they be removed by firing and replaced by welding additional knives. Since such work in coal mines is prohibited by law in the United Kingdom, it must:

9 98 9 9

• 9 9

9 9 9

9 9 ·

The rotary member is removed from the quarrying or tunneling machine and transported from the mine to the surface or to a safe area for carrying out welding operations.

In addition to this problem, and as already mentioned above, the broken knife will release the water supply, so that instead of the water jet being constricted by the relatively small diameter of the spray nozzle to exit the desired area, large water losses occur by uncontrolled outlet from the open This leads to a reduction in the water flow or a reduction in the efficiency of the flow to the remaining spray nozzles, and possibly an undesirable accumulation of water in the mine field.

SUMMARY OF THE INVENTION

The aforementioned drawbacks are largely eliminated by the rubbing knife of the head according to the invention, which further comprises a plug hole in the dark that intersects the pressurized water line and a plug is provided in the plug hole, which is either through or through. blind. By arranging the plug hole, the water supply to the broken knife is blocked.

In a preferred embodiment, the plug opening intersecting the conduit is provided with an inlet threaded portion for receiving a plug having an external thread. The seal is easy to insert and thus replaceable.

In another preferred embodiment, the through-plug is provided with a filter through which water to be introduced into the spray nozzle must flow.

In another preferred embodiment, the filter has the shape of a thimble, is made of a metal fabric and is arranged in a recess of the plug.

In another preferred embodiment, the plug (11A, 11B) is provided with at least one sealing ring.

In another preferred embodiment, the aperture formed in the front part is hexagonal. This allows for better locking of the blade on the mandrel.

In another preferred embodiment, the knife is provided with a threaded hole on the front portion for receiving the water spray nozzle.

In another preferred embodiment, the inner water conduit comprises at least two linear conduits leading into a side chamber arranged in the side wall of the knife and closed by a cover plate, the cover plate being removable to expose the ends of the crossing guides and .

4 4 4 4 · 4 · 4 · 4 · 4 · 4 · 4 · 4 · 4 · 4 · 4 · 4 · 4 · 4 4 4 4 4 4 4 ··

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the drawings in which: FIG. 1 is a front view of the cutting knife housing of the present invention; FIG. and FIG. 4 is a second embodiment of a plug for insertion into a canine housing formed as a plug.

DETAILED DESCRIPTION OF THE INVENTION

The cutting blade 1 is formed from a mandrel 2, which in use is welded to the rotary cutting head. Furthermore, the rubbing knife 1 has a front part 3 and a rear surface 4. The front part 3 is provided with a hexagonal hole 5 for removably accommodating the sleeve for the mandrel of the head or directly of the mandrel as a support. The pressurized water inlet 6 is connected in the mandrel 2 of the cutter blade 1 with guides 20, 16, 15 and from the other side there is an inlet 7 for connecting pressurized water, while the discharge nozzle (not shown) is arranged in the opening 8 on the front 3 in the outlet 9 .

The seal opening 10 is threaded in the first portion and intersects the guide 16 towards the back face 4 of the cutting blade 1. A plug 11A is inserted and removable into the seal opening 10, which is designed to be through so as to allow water flow. In the event of a failure, an alternative is provided in the design of the plug 11B, which allows the inlet 6 to be blocked and the water flow to be closed. To protect impurities in the feed water that could block the spray nozzle, a metal fabric filter 12 is provided in the stopper 11A through which the water must pass when inlet to the spray nozzle. Both plugs 11A and 11B are provided with resiliently deformable sealing rings 13, 14.

Two linear pressurized water lines 15, 16 discharge into the side wall 17 of the knife 1 into a side chamber 18 closed by a cover plate 19. The cover plate 19 is removable to open the ends of the intersecting lines so that a cleaning stick can be inserted into the lines 15 or 16. to remove impurities that may clog them.

Claims (9)

PATENT CLAIMS 1. A water-cooled rubbing knife consisting of a mandrel and a head end provided with an aperture for receiving the head of the rubbing head, the pressurized water supply connected to the pressurized water inlet connected to the pressurized water inlet, and a discharge nozzle is provided in the opening on the front part of the water guide outlet, characterized in that it is further provided with a plug hole (10) intersecting the pressurized water line (16) on the mandrel (2) and a plug (10) arranged in the plug hole (10) 11A), which is either a through or blind (11B). The rubbing blade according to claim 1, characterized in that the plug opening (10) intersecting the guide (16) is provided with an inlet threaded portion for receiving a plug (11A or 11B) which is provided with an external thread. The rubbing blade according to claim 1 or 2, characterized in that the through plug (11A) is provided with a filter (12) through which the water to be introduced into the spray nozzle must flow. A rubbing knife according to claim 3, characterized in that the filter has the shape of a thimble, is made of metal fabric and arranged in the recess of the stopper (11A). Rubbing blade according to one of the preceding claims, characterized in that the plug (11A, 11B) is provided with at least one sealing ring (13, 14). The cutting blade according to one of the preceding claims, characterized in that the opening (5) formed in the front part (3) is hexagonal. The cutting blade according to one of the preceding claims, characterized in that it has a threaded bore (8) on the front part (3) for receiving the water spray nozzle. »· · · · Rubbing knife according to one of the preceding claims, characterized in that the internal water line with the inlet (6) consists of at least two linear guides (15, 16) opening into a side chamber (18) arranged in the side wall (17) of the knife (6). 1) and closed by a cover plate (19), wherein the cover plate (19) is removable to expose the ends of the intersecting lines (15, 16) and allow the cleaning rod to be inserted to remove dirt from the clogging lines (15, 16). A rotary ore for rotating ore, characterized in that it is provided with a plurality of welded-on cutting blades according to one of the preceding claims.