FR2571427A1 - HAVAGE TOOL, PARTICULARLY FOR MACHINES FOR PATHWAYS - Google Patents

Abstract

HAVING TOOL INCLUDING A HAVING PIC AND A PIC HOLDER 2, THE PIC HOLDER WITH A REFRIGERANT INJECTOR FOR THE HAVING PIC AND A REFRIGERANT DUCT LEADING TO THE INJECTOR. THIS REFRIGERANT DUCT IS SUBDIVIDED INTO A SUPPORT BORE FOR THE REFRIGERANT INJECTOR AND A 4B SUPPLY BORE. THE SUPPLY BORE HAS A MUCH LARGER SECTION THAN THE SUPPORT BALE AND IT IS EXTERIOR ACCESS. IN THE SUPPLY BALE IS A REFRIGERANT FILTER WITH A LARGER FILTERING SURFACE ENCONSEQUENCE SUCH AS A RELATIVELY TIGHT MESH FILTER CAN BE USED WITHOUT RISK OF CLOUDING. THIS RESULTS IN THE POSSIBILITY OF MOUNTING, WITHOUT RISK OF OBSTRUCTION, A REFRIGERANT INJECTOR WITH A RELATIVELY LOW PIPING SECTION SO THAT THE WATERING AND THEREFORE THE COOLING OF THE HAVING PICK CAN BE ENSURED WITH A REDUCED REFRIGERANT FLOW. NO LONGER CAUSES GENE FOR THE WORK TO BE CARRIED OUT IN THE GALLERY.

Description

1.

  The invention relates to a cutting tool, in particular

  culier for machines for tracing in a vein, comprising a cutting peak and a peak support, the peak support

  having at least one refrigerant injector for the core

  born of refrigerant at the peak of the havage and at least one refrigerant duct leading to the injector, which duct is

  provided with at least one support bore for the refrigeration injector

  manager and for a filter placed in front of the refrigerant injector

  feeder and a feed bore opening into the

wise sage.

  When using cutting tools when digging galleries, but also in veins with

  hard rock inclusions, relative temperatures

  on the peaks of havage with the

  possibility of sparking. Such a forma-

  tion of sparks includes the risk of explosion when the

  rocks or veins contain firedamp. It is therefore necessary

  be able to fight the temperature. For this purpose, the peak of

  havage is cooled by injecting a coolant, generally

  water ral. Since each cutting peak must be cooled individually, each cutting peak support includes a refrigerant injector directed towards the cutting peak. To prevent blockage of the refrigerant injector, the refrigerant is brought to the injector under extreme pressure - the pressures used reach several 100 bars. Furthermore, the refrigerant injector has a relatively large nozzle section of at least 0.6 mm in diameter and possibly more. Experience shows that for the well-known cutting tools, a smaller section of the injector immediately leads to the sealing of the refrigerant injector. Even a filter placed in front of the refrigerant injector and which, because of its small filtering surface, can only be a coarse filter, can do nothing to prevent immediate clogging of the filter. As a result, the cooling of the peaks

  of cutting leads to a relative cooling water flow

  of the refrigerant injectors. This is disadvantageous for various reasons. First of all, a large water outlet implies discomfort for the support work at the level of the working face and the almost impossibility of clearing the gallery level due to the earth and somehow sparkling coal. Same

  the evacuation of these foamy materials is problematic

  tick. In addition, there is a risk of swelling in the gallery level, which compromises the support of the galleries. Furthermore, fouling of the refrigerant injectors is nevertheless often not excluded so that the injector

  respectively fouled refrigerant must be replaced.

  This not only involves a long and costly downtime

  the cutting process but also the fact that the injection

  the refrigerant considered can be relatively easy-

  ment lost. The same is true for the filter placed in front.

  The invention proposes to remedy these drawbacks.

  The object of the present invention is to create, in particular

  ment for machines for tracing in the vein, a cutting tool of the aforementioned kind for which the filtering surface is

  significantly increased while retaining a construct-

  tion identical, and thus significantly reduce the risk of fouling of the filter on the one hand and the section of the refrigerant injector on the other hand, without risk of blockage, so that perfect cooling

  the havage peak can be ensured with a cooling supply

  managing much weaker than in the past.

  According to the invention, for the cutting tool of the kind

  aforementioned, this object is achieved by the fact that the bore of ali-

  mentation has a section much larger than the bearing bore and that it is provided, at its end opposite to the arrival of the refrigerant, with an orifice opening at the

  surface of the peak support, that a filter of a wire surface

  much larger than that of the filter in the

  support wise can be engaged, through said orifice, in the supply bore, and that the orifice can be closed in a sealed manner to the refrigerant. The invention is based on the discovery that the increase in the filtering surface

  does not require an enlargement of the support bore -

  impossible due to the construction of the peak support -

  to be able to introduce a larger filter, but it is, on the contrary, easy to enlarge the feed bore in the peak support and that a relatively large filter

  can be inserted into the enlarged feed bore.

  This results in a considerable increase in the surface

  filtering. The considerable increase in the surface area

  trante in turn brings the possibility of using relatively tight and therefore fine mesh filters without

  an immediate fouling of the filter is not to be feared.

  The fine or tight mesh filters allow, on the other hand, the implementation of a refrigerant injector with o10 a relatively small injection section which can be reduced, in the context of the present invention, up to

  a diameter of 0.2 mm. As a result, it no longer leaves the in-

  coolant nozzle, for watering the cutting peak, that a quantity of refrigerant and in particular of weak water consequently which is however perfectly sufficient to ensure perfect cooling of the cutting peak and therefore to prevent the formation of sparks. In a preferred embodiment of the invention, the diameter of the feed bore is two to four times, and preferably

  three times larger than the diameter of the support bore.

  It is the same for the filter engaged in such a way that it is often possible, depending on the geological conditions and service conditions, to be satisfied with the filter in the supply bore and to renounce the filter in the support bore. This is particularly so when, according to another characteristic of the invention, two supply bores provided with filters and orifices are arranged on either side of the rod housing in the pick support and communicate with each other. on the one hand with the support bore for the refrigerant injector and, on the other hand, with the refrigerant inlet. In the embodiment with two bores

  the filter surface is very simple-

  doubled, while the much larger cross section of

  filters that can be introduced into the feed bores

  tation entails - with respect to a filter placed in -.

  the support bore for the refrigerant injector - an additional multiplication of the filtering surface. Similarly, the risk of fouling the filters installed decreases, even if they are much finer filters or much tighter mesh which are necessary to reduce the diameter of the injector of refrigerant and therefore the amount of refrigerant

debited. -

  Other essential features of the invention are described below. This is how the orifices can be provided with female threads for screwing the

  filters and threaded plugs closing the bores of the

  ment, if necessary with interposition of seals. This allows easy replacement of filters in the supply bores, and replacement or loss of the coolant injector is no longer necessary or to be feared. The filters are preferably made under

  the form of filter screen cartridges with tarau-

  dees that can be targeted in the holes. The term “screen filter cartridges” is understood to mean tubular screen filters closed at one of their ends in such a way that the refrigerant must necessarily pass through the tight mesh screen. It is advantageous to comply with. threaded plugs with hexagon socket bolts (Inbus)., which can easily be embedded in the holes in the holder

  peak and which, therefore, do not interfere.

  The advantages offered by the invention reside essentially in the production of a cutting tool, in particular for machines for tracing in a vein - or for the cutting head thereof, in which the surface

  filter of the refrigerant filters placed in front of the injection

  refrigerant is considerably increased while retaining an identical construction. This increase in the filtering surface makes it possible to use particularly fine filters with close mesh without there being any risk of immediate fouling. This results in the possibility of mounting in the peak support, without risk of obstruction, a refrigerant injector with an extremely small section of nozzle of a diameter reduced to

  0.2 mm so that the flow of refrigerant and in particular -

  ment the water flow is considerably reduced and that, despite this, an irreproachable cooling of the cutting peak is ensured. Thanks to the reduction in the refrigerant flow, support work on the face is no longer hampered. In addition, clearing the gallery level no longer encounters any difficulty. A swelling of the level of galleries and the resulting inconveniences for the support works are avoided. In addition, there is no more land and sparkling coal; on the contrary, their evacuation can be carried out without difficulty. Added to this is the fact that a

  replacement of the refrigerant injector is no longer necessary

  so that the refrigerant injector can no longer be lost. On the other hand, the replacement of filters in the supply bores can be carried out without problem.

  The following description, next to the drawings

  appended as nonlimiting examples, will allow

  understand how the invention can be put into practice.

  Figure i shows a vertical section of the

  peak support of a cutting tool according to the invention.

  Figure 2 shows a top view of the object

of figure i.

  Figure 3 shows a side view of the tool

of havage according to the invention.

  Figure 4 shows, on a larger scale, a detail of Figure 1, in the region of the support bore

for the refrigerant injector.

  Figure 5 shows, on a larger scale, a

  detail of the object of figure 2, in the region of the alé

  supply wise with filter in place.

  The figures represent a cutting tool, in

  particularly for machines for tracing in a vein, including

  taking a peak of havage 1 and a support of peak 2, the support of peak 2 having at least one injector of refrigerant 3 for the supply of refrigerant to the peak of havage 1 and at least

  a refrigerant duct 4 leading to the refrigerant injector

  manager 3, which conduit is provided with at least one support bore 4a for the refrigerant injector 3 and for a

  filter 5a placed, seen in the direction of flow, in front of the

  refrigerant nozzle 3 and a supply bore 4b

  opening into the support bore 4a. The feed bore

  tion 4 b has a much larger section than the support bore l4a and it is provided, at its end opposite to the arrival of refrigerant 6, with an orifice 7 opening onto the surface of the peak support 2. A filter 5b with a filtering surface much larger than that of the filter 5a in the support bore 4a can be engaged, through the orifice 7, in the supply bore 4b. The diameter of the feed bore 4b is two to four times, and preferably three times, larger than the diameter of the support bore 4a. For example, the diameter of the support bore 4a can be 4 mm and the diameter of the feed bore 4b

  can be 10mm or 15mm. In the example of realization

  tion, two supply bore 4b provided with filters 5b and orifices 7 are arranged on either side of the rod housing 8 in the pick support 2 and communicate on the one hand with the bearing bore 4a for the refrigerant injector

  3 and, on the other hand, with the arrival of refrigerant 6. The

  the support bearing 4la with the refrigerant injector 3 is located, so to speak, on the front face of the peak support 2 and it is directed at a predetermined angle towards the cutting peak 1. The supply bores 4b communicate with the support bores 4a by means of junction bores 9 and extend essentially orthogonally to the rod housing 8 and to the support bore 4a, in

  ignoring the angle of inclination of the latter.

  The orifices 7 have female threads for screwing

  filters 5b and threaded plugs 10 closing off the bores

  supply wise 4b which are screwed, if necessary with interposition of seals, in the orifices 7 which they provide sealed sealing to the refrigerant, and this even taking into account the high operating pressures used. The filters, 5a, 5b are produced in the form of screen filter cartridges with threaded sockets 11. These are tubular screen filters 12 closed at one

  of their ends to obtain the forced passage of the ref-

  manager. The threaded plugs 10 are shaped into bolts to

  hexagon socket embedded in the holes 7.

Claims (6)

  1. Cutting tool, in particular for machines for tracing in a vein, comprising a cutting peak and a peak support, the peak support having at least one injector of refrigerant for supplying the coolant to the peak of cutting and at least a refrigerant pipe leading to the injector, which pipe is provided with at least one bore   support for the refrigerant injector and an a-   the feed opening into the support bore, characterized in that the feed bore (4b) has a much larger section than the support bore (4a),   that it is provided, at its end opposite to the arrival of a refrigerator,   manager (6), an orifice (7) opening onto the surface of the support   peak port (2), and a filter (5b) with a filtering surface much larger than that of the filter (5a) in the bearing bore (4a) can be engaged, through the orifice ( 7), in the supply bore (4Jb), the orifice (7) can be   sealed in the refrigerant.   2. Cutting tool according to claim 1,   characterized by the fact that the diameter of the feed bore   mentation (4b) is two to four times, and preferably three times, greater than the diameter of the bearing bore (4a).   3. Cutting tool according to one of the claims   1 or 2, characterized in that two supply bores   tation (4b) provided with filters (5b) and orifices (7) are arranged on either side of the rod housing (8) in the pick support (2) and that they communicate on the one hand with the support bore (4a) for the refrigerant injector (3)   and, on the other hand, with the arrival of refrigerant (6).   -4. Cutting tool according to any one of   Claims i to 3, characterized in that the ori-   fices (7) have female threads for screwing   filters (5b) and threaded plugs (10) sealing the bores   feeding wise (4b), if necessary with interposition seals.   5. Cutting tool according to any one of   Claims 1 to 4, characterized in that the filters 2c71427   (5a, 5b) are produced in the form of filter cartridges-   screen with threaded bushings (11).   6. Cutting tool according to any one of   Claims 1 to 5, characterized in that the bou-   threaded bolts (10) are shaped into hexagon socket bolts C.