阅读说明：本技术 一种降低边缘滚刀磨损的方法 (Method for reducing abrasion of edge hob ) 是由 娄磊 吴万荣 于 2021-09-24 设计创作，主要内容包括：本发明公开了一种降低边缘滚刀磨损的方法,在滚刀盘的圆周方向上设置若干滚刀与冲击钻头,滚刀盘转动过程中,冲击钻头除冲击破碎岩石外,还随刀盘一起旋转并切削岩石,最终在岩石上留下若干个同轴布置的冲击破岩环,冲击破岩环的环内侧和环外侧对应形成临空损伤区,临空损伤区使岩体强度变弱,在滚刀掘进滚碾岩体时减少滚刀磨损。滚刀与冲击钻头同时作用于岩石进行复合破岩,一定掘进直径下岩体被数个冲击破岩环分割,滚刀破碎单元作用的区域为滚刀环,滚刀环区岩体为临空岩体,且滚刀环的内外两侧均为临空损伤区,这极大降低了滚刀环岩体的强度,有利于滚刀破岩,减少滚刀磨损,提高了掘进效率。(The invention discloses a method for reducing the abrasion of edge hobs, wherein a plurality of hobs and impact drill bits are arranged in the circumferential direction of a hob disc, the impact drill bits rotate along with the hob disc and cut rocks in addition to impacting and crushing the rocks in the rotating process of the hob disc, finally, a plurality of impact rock-breaking rings which are coaxially arranged are left on the rocks, the inner sides and the outer sides of the impact rock-breaking rings correspondingly form an air-facing damage area, the strength of rock mass is weakened in the air-facing damage area, and the abrasion of the hobs is reduced when the hobs dig and roll the rock mass. The hob and the percussion drill bit simultaneously act on the rock to carry out composite rock breaking, the rock mass is cut apart by several percussion rock breaking rings under certain tunneling diameter, the region of hob crushing unit effect is the hob ring, the hob ring zone rock mass is the face empty rock mass, and the inside and outside both sides of hob ring are the face empty damage zone, and this has greatly reduced the intensity of hob ring rock mass, is favorable to the hob to break the rock, reduces hob wearing and tearing, has improved tunneling efficiency.)

1. A method for reducing the abrasion of an edge hob is characterized in that: set up a plurality of hobbing cutters and percussion bit on the circumferencial direction of hobbing cutter dish, the hobbing cutter dish rotates the in-process, and percussion bit still rotates and cuts the rock along with the blade disc in addition to strikeing broken rock, finally leaves the broken rock ring of the impact of a plurality of coaxial arrangement on the rock, and the ring inboard and the ring outside of the broken rock ring of impact correspond and form and face empty damage zone, face empty damage zone and make the rock mass intensity weak, reduce hobbing cutter wearing and tearing when the hobbing cutter tunnelling and roll and grind the rock mass.

2. The method of reducing edge hob wear according to claim 1, wherein: the rotary cutter is characterized in that a plurality of hobs (1) and impact drill bits (2) are arranged in the circumferential direction of a hob plate (3), the impact drill bits (2) on the hob plate (3) and located on the same diameter position form a group of impact crushing units, the hobs (1) on the hob plate and located on the same diameter position form a group of hob crushing units, and the impact crushing units and the hob crushing units are all arranged in a plurality of groups and are arranged on the hob plate in a staggered mode.

3. The method of reducing edge hob wear according to claim 1, wherein: an impact drill bit (2) is driven by a rock drill (4), the rock drill (4) is fixed on a hobbing cutter disc (3), and all the rock drills (4) move synchronously, so that the impact drill bit (2) realizes synchronous impact in the axial direction of the hobbing cutter disc.

4. A method of reducing edge hob wear according to claim 3, characterised in that: the hob head (3) comprises a cutter head body (31) and a protective cover (32), the hob (1) and the percussion bit (2) are arranged on the positive end face of the cutter head body (31), the protective cover (32) is fixed on the reverse end face of the cutter head body (31), a plurality of coaxially arranged fixing rings (33) are arranged on the reverse end face of the cutter head body (31) and on the inner side of the protective cover (32), and a rock drill (4) is installed on the outer wall face of the fixing rings (33).

5. The method of reducing edge hob wear according to claim 4, wherein: the outer wall surface of the fixing ring (33) is provided with an adjusting slide rail (34), the adjusting slide rail (34) is connected with a sliding plate (35) in a sliding mode, and the rock drilling machine (4) is fixed on the sliding plate (35).

6. The method of reducing edge hob wear according to claim 1, wherein: the circumferential wall of the head part of the impact drill bit (2) is provided with a plurality of slag blowing holes (21).

7. The method of reducing edge hob wear according to claim 1, wherein: the end surface of the head part of the impact drill bit (2) is embedded with a plurality of impact drill teeth (22).

The technical field is as follows:

the invention relates to a method for reducing the abrasion of an edge hob.

Background art:

the full-face rock tunnel boring machine has low efficiency when large-diameter hard rock operation is carried out, the speed difference between the central hob and the edge hob is large, the edge hob is seriously abraded due to the large speed difference, and the boring cutter is frequently replaced when needed, so that the boring efficiency of the boring machine is low, and the boring cost is high. When a hard rock heading machine with the diameter of 9.5m is adopted to work in the existing tunnel with the geological hard granite stratum, the cutter at the edge of a cutter head is seriously worn, the cutter needs to be replaced once when the average footage is 2.8m, the heading efficiency is low, the consumption of the cutter accounts for about 40 percent of the manufacturing cost of the whole heading machine, and the price is high.

The method for improving the cutterhead locally can improve the geological adaptability and the tunneling efficiency of tunneling equipment, but the speed difference between the central hob and the edge hob is not fundamentally eliminated, so that the edge hob still wears seriously during the large-diameter hard rock tunneling operation. In order to reduce the abrasion loss of the edge hob during the tunneling operation of the large-diameter hard rock, a method for reducing the abrasion loss of the edge hob is provided on the basis of the current tunneling technology so as to improve the tunneling operation efficiency of the large-diameter hard rock and reduce the abrasion loss of the edge hob.

The invention content is as follows:

the present invention provides a method for reducing the wear of an edge hob in order to solve the problems of the prior art.

The technical scheme adopted by the invention is as follows:

a method for reducing abrasion of an edge hob is characterized in that a plurality of hobs and impact drill bits are arranged in the circumferential direction of a hob disc, in the rotating process of the hob disc, the impact drill bits not only impact broken rocks, but also rotate together with the hob disc and cut the rocks, finally, a plurality of impact broken rock rings which are coaxially arranged are left on the rocks, the inner sides and the outer sides of the impact broken rock rings correspond to form an adjacent hollow damage area, the strength of rock mass is weakened in the adjacent hollow damage area, and abrasion of the hobs is reduced when the hob is used for tunneling and rolling the rock mass.

Furthermore, a plurality of hobbing cutters and impact drill bits are arranged in the circumferential direction of the hobbing cutter disc, the impact drill bits on the same diameter position on the hobbing cutter disc form a group of impact crushing units, the hobbing cutters on the same diameter position on the hobbing cutter disc form a group of hobbing cutter crushing units, and the impact crushing units and the hobbing cutter crushing units are arranged in groups and are arranged on the hobbing cutter disc in a staggered mode.

Furthermore, one impact drill bit is driven by one rock drill which is fixed on the hobbing cutter disc, and all the rock drills synchronously move, so that the impact drill bit realizes synchronous impact in the axial direction of the hobbing cutter disc.

Further, the hob head includes cutter head body and protection casing, the positive terminal surface of cutter head body is all arranged in to hobbing cutter and percussion bit, and the protection casing is fixed on the cutter head body reverse end face, and the inboard that just is located the protection casing on the cutter head body reverse end face is equipped with the solid fixed ring of a plurality of coaxial arrangements, installs the rock drill on solid fixed ring's outer wall.

Furthermore, the outer wall surface of the fixing ring is provided with an adjusting slide rail, the adjusting slide rail is connected with a slide plate in a sliding manner, and the rock drill is fixed on the slide plate.

Furthermore, a plurality of slag blowing holes are arranged on the circumferential wall of the head part of the impact drill bit.

Furthermore, a plurality of percussion drill teeth are embedded on the end surface of the head of the percussion drill bit.

The invention has the following beneficial effects:

the hob and the percussion drill bit simultaneously act on the rock to carry out composite rock breaking, the rock mass is cut apart by several percussion rock breaking rings under certain tunneling diameter, the region of hob crushing unit effect is the hob ring, the hob ring zone rock mass is the face empty rock mass, and the inside and outside both sides of hob ring are the face empty damage zone, and this has greatly reduced the intensity of hob ring rock mass, is favorable to the hob to break the rock, reduces hob wearing and tearing, has improved tunneling efficiency.

Description of the drawings:

fig. 1 is a schematic view of a roller cutter simultaneously acting on rock with a percussion drill bit.

FIG. 2 is a block diagram of the hob and percussion drill head of the present invention on a hob head.

Fig. 3 is a three-dimensional structural view of the reverse side of the hob head in accordance with the present invention.

Fig. 4 shows the construction of the rock drilling machine mounted on a stationary ring.

Fig. 5 is a block diagram of the rock drilling machine.

Fig. 6 is a structural view of a percussion drill bit of the present invention.

The specific implementation mode is as follows:

the invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, the method for reducing the abrasion of the edge hob according to the present invention includes that a plurality of hobs and impact bits are arranged in the circumferential direction of a hob disc, the hobs and the impact bits simultaneously act on a rock to achieve composite rock breaking during the rotation of the hob disc, the impact bits impact the rock 400 in a rock breaking area when the composite rock breaking starts, and the impact bits are installed on the hob disc, so that the impact bits not only impact the broken rock but also rotate with the hob disc to cut the rock under the driving of the rotation torque of the hob disc, and finally an impact rock breaking ring K is formed on the rock.

Under the action of cyclic impact load and ground stress, an inner side near-empty damage area and an outer side near-empty damage area are respectively formed on the inner side and the outer side of the impact rock-breaking ring. The inner side and the outer side of the hob are both the near-empty damage areas, so that the strength of the rock mass in the hob ring is weakened, when the hob digs and rolls the rock mass, the abrasion of the hob is reduced, and the digging efficiency is improved.

As shown in fig. 2, a plurality of hob cutters 1 and impact drill bits 2 are arranged in the circumferential direction of a hob disk 3, the impact drill bits 2 located at the same diameter position on the hob disk 3 form a group of impact crushing units, the hob cutters 1 located at the same diameter position on the hob disk form a group of hob cutter crushing units, and the impact crushing units and the hob cutter crushing units are both arranged in a plurality of groups and are arranged in a staggered manner on the hob disk.

The impact drill bit 2 is driven by the rock drill 4, the rock drill 4 is fixed on the hobbing cutter disc 3, and all the rock drills 4 move synchronously, so that the impact drill bit 2 realizes synchronous impact in the axial direction of the hobbing cutter disc.

As shown in fig. 3, 4 and 5, the hob head 3 includes a cutter head body 31 and a shield 32, the hob 1 and the percussion bit 2 are both disposed on the front end surface of the cutter head body 31, the shield 32 is fixed on the reverse end surface of the cutter head body 31, a plurality of coaxially disposed fixing rings 33 are disposed on the reverse end surface of the cutter head body 31 and on the inner side of the shield 32, and the rock drilling machine 4 is mounted on the outer wall surface of the fixing rings 33.

In order to conveniently adjust the axial position of the rock drilling machine 4 on the hobbing cutter head 3, an adjusting slide rail 34 is arranged on the outer wall surface of the fixing ring 33, a slide plate 35 is connected on the adjusting slide rail 34 in a sliding mode, the rock drilling machine 4 is fixed on the slide plate 35, and the slide plate 35 is locked through screws after the position of the slide plate 35 is adjusted.

As shown in fig. 6, in order to increase the breaking efficiency of the percussion drill bit 2, a number of percussion drill teeth 22 are embedded in the end surface of the head of the percussion drill bit 2.

The circumferential wall of the head part of the percussion drill bit 2 is provided with a plurality of slag blowing holes 21, and the slag blowing holes 21 avoid slag accumulation on the percussion drill bit.

Hobbing cutter and percussion bit act on the rock simultaneously and carry out compound broken rock, and the rock mass is cut apart by several impact broken rock ring under certain tunnelling diameter, and the region of hobbing cutter broken cell effect is the hobbing cutter ring, and hobbing cutter ring zone rock mass is for facing empty rock mass, and the inside and outside both sides of hobbing cutter ring are facing empty damage area, and this has greatly reduced the intensity of hobbing cutter ring rock mass, is favorable to the hobbing cutter to break rock, and it is big more to face empty damage area scope, and the intensity of hobbing cutter ring zone rock mass just weakens more, is favorable to the hobbing cutter to break rock more.

The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.