Tensile-fracturing hard-rock-breaking boring machine and construction method

Abstract

A tensile-fracturing hard-rock-breaking boring machine and a construction method. The boring machine comprises: a cutting motor (a1) and a speed reducer (a3); a cutting telescopic oil cylinder (a2), which extends out so as to realize cutting feed and is fixed to the cutting motor (a1), an output end thereof being hinged to a telescopic outer cylinder (b24) of a telescopic part (a4); a telescopic part (a4), which is located between cutting heads and the cutting telescopic oil cylinder (a2), and comprises a driving spiral bevel gear (b20) used for transmission of power from the speed reducer and fixed to the tail end of a transmission shaft (b21); and a middle fixing box (a8), which comprises a middle fixing box body (b16), a speed reduction shaft (b19), a small speed reduction gear (b17), a large spiral bevel gear (b18), a cutting shaft (b8), a large speed reduction gear (b7), a left fixed spiral bevel gear (b13), a left bearing pedestal (b14), a right fixed spiral bevel gear (b5) and a right bearing pedestal (b6). The cutting heads perform accelerated self-rotation while revolving downward towards a front wall along with cutting box bodies. The self-rotation and revolution of a left cutting head and a right cutting head are coordinated to enable smooth cutting, and the total width of the left cutting head and the right cutting head is reduced without affecting normal full-face tunneling.

Description

Tunnel boring machine for breaking hard rock and its construction method Technical Field

[0001] The invention belongs to the technical field of mining equipment and relates to a hard rock breaking tunnel boring machine and a construction method. Background Art

[0002] my country is a major coal mining and consumption country, and the country's demand for infrastructure construction, such as railways, highways, and water conservancy projects, is constantly increasing. These projects often involve the excavation of tunnels or roadways. In recent years, with the continuous decline in domestic coal reserves, the need to expand roadway depths is imminent. However, as the depth of the strata increases, the geological conditions become more complex, the rock hardness continues to increase, and the problem of faults continues to intensify, resulting in an increasing number of hard rock roadway construction projects.

[0003] For hard rock tunneling, the existing double-cutting head horizontal axis roadheaders on the market use an extrusion rock breaking method, which has high power consumption, low cutting hardness and a wide total width of the two cutting heads.

[0004] Therefore, achieving low-efficiency tunneling has become an urgent problem to be solved in coal mining projects.

[0005] Summary of the Invention

[0006] The present invention aims to provide a hard rock cracking tunnel boring machine and construction method. This machine utilizes two sets of cutting heads for rotation and revolution, with the machine's telescopic cylinders for cutting feed and a lifting and rotating mechanism for cutting feed, achieving hard rock cracking tunnel boring with low power consumption and a narrow combined width of the two cutting heads. The present invention employs the following technical solutions:

[0007] A tensile hard rock breaking tunnel boring machine includes a cutting part 8, wherein the cutting part 8 includes:

[0008] Cutting motor a1 and reducer a3, cutting motor a1 is installed in the main body 1, reducer a3 is connected to cutting motor a1; reducer a3 is connected to the transmission shaft b21 of the telescopic part a4;

[0009] The cutting telescopic oil cylinder a2 is extended to realize cutting feed, which is fixed to the cutting motor a1, and its output end is hinged to the telescopic outer cylinder b24 of the telescopic part a4;

[0010] The telescopic portion a4 is located between the cutting head and the cutting telescopic cylinder a2 and includes: a driving spiral bevel gear b20 for transmitting power from the speed reducer a3, which is fixed to the end of the transmission shaft b21;

[0011] And the intermediate fixed box a8, which includes:

[0012] The middle fixed box b16 is connected to the telescopic inner cylinder b25 and the telescopic protective cylinder b22, and the deceleration shaft b19 and the cutting shaft b8 are installed in it;

[0013] The reduction shaft b19, the small reduction gear b17 and the large spiral bevel gear b18, the large spiral bevel gear b18 and the small reduction gear b17 are all mounted on the reduction shaft b19;

[0014] Cutting shaft b8 and large reduction gear b7; large reduction gear b7 is key-connected to cutting shaft b8; cutting shaft b8 is mounted between left bearing seat b14 and right bearing seat b6 through bearings;

[0015] The left fixed spiral bevel gear b13 and the left bearing seat b14, the left fixed spiral bevel gear b13 is fixed to the left bearing seat b14, and the gear at the end of the left spiral bevel gear shaft b12 in the cutting box a9 is externally meshed with the left spiral bevel gear b13;

[0016] The right fixed spiral bevel gear b5 and the right bearing seat b6, the right fixed spiral bevel gear b5 is fixed on the right bearing seat b6; the gear at the end of the right spiral bevel gear shaft b4 in the cutting box a9 is externally meshed around the right fixed spiral bevel gear b5;

[0017] The large spiral bevel gear b18 meshes with the driving spiral gear b20, thereby transmitting the speed to the small reduction gear b17 through the reduction shaft b19;

[0018] The small reduction gear b17 is meshed with the large reduction gear b7, and the large reduction gear b7 drives the cutting shaft b8 to rotate.

[0019] Preferably, the telescopic portion a4 further includes:

[0020] The telescopic protective tube b22, the telescopic outer tube b24 and the telescopic inner tube b25 are sequentially sleeved on the transmission shaft b21 from the outside to the inside.

[0021] Preferably, the cutting box a9 comprises a left cutting box and a right cutting box of the same structure; wherein,

[0022] The left cutting box includes: a left cutting box body b15, a left spiral bevel gear shaft b12, a left connecting plate b11, and a left cutting head b10; the left connecting plate b11 connects the left cutting head and the left spiral bevel gear shaft b12;

[0023] The left coupling plate b11 is fixed to the end of the left spiral bevel gear shaft b12 and the left connecting bearing seat;

[0024] The left connecting bearing seat is sleeved in the left mounting seat;

[0025] The left spiral bevel gear shaft b1 is installed on the left connecting bearing seat through a bearing;

[0026] The left coupling plate b11, the left connecting bearing seat, the left mounting seat, and the left bearing seat b14 are fixed in sequence, and the left bearing seat b14 is fixed to the middle fixing box a8;

[0027] The left cutting head b10 is fixed to the left coupling disc b11 through the cutting disc;

[0028] The left cutting box b15 is installed on one end of the cutting shaft b8 and is also installed on the left connecting bearing seat.

[0029] Preferably, the right cutting box includes: a right cutting box body b1, a right spiral bevel gear shaft b4, a right coupling plate b3, and a right cutting head b2;

[0030] The right coupling plate b3 connects the cutting head and the right spiral bevel gear shaft b4;

[0031] The right coupling plate b3 is fixed to the end of the right spiral bevel gear shaft b4 and the right connecting bearing seat;

[0032] The right connecting bearing seat is sleeved in the right mounting seat, and the right spiral bevel gear shaft b4 is installed in the right connecting bearing seat through a bearing;

[0033] The right coupling plate b3, the right connecting bearing seat, the right mounting seat, and the right bearing seat b6 are fixed in sequence, and the right bearing seat b6 is fixed to the middle fixing box a8;

[0034] The right cutting box b1 is installed on the other end of the cutting shaft b8 and is also installed on the right connecting bearing seat.

[0035] The right cutting head b2 is fixed to the right connecting disc b3 through the cutting disc.

[0036] Preferably, the two ends of the deceleration shaft b19 are respectively arranged in the middle fixed box b16 through the first bearing and the second bearing, the first bearing is adapted to the first bearing seat, and the second bearing is adapted to the second bearing seat; the first bearing seat and the second bearing seat are both fixed to the middle fixed box b16.

[0037] A construction method for a tensile hard rock breaking tunnel boring machine comprises the following steps:

[0038] Step 1: Cut from the lower middle part of the cross section, move from bottom to top, and repeat cutting to the width of the groove;

[0039] Step 2: The cutting head circulates left and right to cut both sides of the groove;

[0040] Step 3: Cutting telescopic cylinder a2 advances twice, and repeats steps 1 and 2 to cut;

[0041] Step 4: Retract the cutting head, move the whole machine forward, and repeat the above method for the next cutting.

[0042] Compared with the prior art, the advantages of the present invention are:

[0043] 1. The left and right cutting heads can coordinate and cut smoothly by rotating and revolving. The total width of the two cutting heads is narrowed without affecting the normal excavation of the entire section.

[0044] 2. The power consumption of the tensile rock breaking method is 0.1-0.2 times that of the traditional extrusion rock breaking method. It can cut rocks with a uniaxial compressive strength exceeding 120MPa, greatly improving the rock breaking capacity and increasing the mining efficiency of hard coal rock. It realizes the full mining and utilization of coal resources, improves the recovery rate of mineral resources, avoids mining machine failures when cutting hard coal seams, saves maintenance costs, ensures the continuity of the mining process, and thus greatly improves economic benefits.

[0045] 3. This solution is initially configured on the EBZ160 cantilever roadheader, but can also be configured on other types of roadheaders. The cutting unit is modified without changing other parts of the selected roadheader, which can save design and manufacturing costs. In addition, according to the needs of the coal roadway, the original roadheading and cutting motor can be used to directly replace the front section of the original cutting unit starting from the reducer, achieving dual-purpose use of one machine and saving purchase costs.

[0046] 4. The multi-cutting head is equipped with a total of 252 picks. The contact time between the picks and the rock is short during the crack-resistant rock breaking process, which reduces wear and increases the life of the picks.

[0047] 5. Without changing the outer dimensions of the reducer housing, reduce the reduction ratio of the reducer, increase its output speed, and avoid excessive diameter of the spiral bevel gear;

[0048] 6. The travel of the telescopic part is reduced to leave enough space for two cuttings. The wall thickness of the telescopic protective tube is increased, and the telescopic protective tube is connected to the cutting box as a whole to improve the strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] FIG1 is a front view of a hard rock breaking tunnel boring machine according to the present invention;

[0050] FIG2 is a top view of the tensile breaking hard rock roadheader of the present invention;

[0051] FIG3 is a front view of the cutting portion of the hard rock breaking type roadheader of the present invention;

[0052] FIG4 is a top view of the cutting portion of the hard rock breaking type roadheader of the present invention;

[0053] FIG5 is a partial view of FIG4;

[0054] FIG6 is a schematic diagram of a trench cutting groove according to the present invention;

[0055] FIG7 is a schematic diagram of cyclic cutting.

[0056] Among them, 1-main body, 2-travel part, 3-conveyor, 4-shovel part, 5-rear support part, 6-hydraulic system, 7-electrical system, 8-cutting part;

[0057] 9-water system, 10-lubrication system;

[0058] a1-cutting motor, a2-cutting telescopic cylinder, a3-speed reducer, a4-telescopic part, a5-vent plug, a6-oil window, a7-cover plate, a8-intermediate fixing box, a9-cutting box;

[0059] b1-right cutting box;

[0060] b2-right cutting head, b3-right coupling plate, b4-right spiral bevel gear shaft, b5-right fixed spiral bevel gear, b6-right bearing seat, b7-large reduction gear, b8-cutting shaft, b9-spray cooling device;

[0061] b10-left cutting head, b11-left coupling plate, b12-left spiral bevel gear shaft, b13-left fixed spiral bevel gear, b14-left bearing seat;

[0062] b15-left cut box;

[0063] b16-middle fixed box;

[0064] b17-small reduction gear, b18-large spiral bevel gear, b19-reduction shaft, b20-driving spiral bevel gear, b21-transmission shaft;

[0065] b22-telescopic protective tube, b23-key plate, b24-telescopic outer tube, b25-telescopic inner tube. DETAILED DESCRIPTION

[0066] The following is a more detailed description of the present invention's tensile rock breaking tunnel boring machine and construction method, with reference to schematic diagrams. These diagrams illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art may modify the present invention described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as a general guideline for those skilled in the art and not as a limitation of the present invention.

[0067] As shown in Figures 1 to 7, the tensile breaking hard rock tunnel boring machine includes: a main body 1, a traveling part 2, a conveyor 3, a shovel part 4, a rear support 5, a hydraulic system 6, an electrical system 7, a cutting part 8, a water system 9, and a lubrication system 10.

[0068] The main body 1 is located in the middle of the machine, with walking sections 2 mounted on the lower left and right sides, respectively, for moving the tunnel boring machine. A cutting section 8 is located above the front end of the main body for cutting hard rock; a shovel section 4 is located below for loading coal and rock; a conveyor 3 is located above the rear end of the main body for transporting cargo loaded by the shovel section; and a rear support 5 is located below for stable support of the unit.

[0069] The water system 9 provides water for the cooling spray device b9 (mounted on the outer surface of the intermediate fixed box b16), transporting water from the source to the cooling spray nozzle via a water pipe. The right side of the main body houses the pump station for the lubrication system 10, while the left side houses the operating console.

[0070] The cutting part 8 includes a cutting motor a1, a cutting telescopic oil cylinder a2, a speed reducer a3, a telescopic part a4, an intermediate fixing box a8, a cooling spray device b9 and a cutting box a9.

[0071] Specifically, cutting motor a1 is mounted at the front upper end of main body 1, and speed reducer a3 is connected to cutting motor a1. Speed ​​reducer a3 is connected to transmission shaft b21 of telescopic section a4. Without changing the outer dimensions of the speed reducer housing, the speed reducer's reduction ratio is reduced, its output speed is increased, and the diameter of the spiral bevel gear is prevented from being too large.

[0072] The cutting motor a1 drives the cutting head to rotate through the reducer a3, and the picks installed on the cutting head are used to crush the coal and rock.

[0073] The cutting telescopic oil cylinder a2 is arranged at the upper left part of the cutting motor a1 and the reducer a3. The cutting telescopic oil cylinder a2 is fixed to the cutting motor a1, and its output end is hinged to the telescopic outer cylinder b24 of the telescopic part a4.

[0074] The extension of the cutting telescopic cylinder A2 enables cutting and feeding, and the cutting is then carried out through the lifting and slewing mechanisms, achieving the goal of breaking the hard rock and advancing. The lifting mechanism is connected to the telescopic section of the cutting mechanism to control its lifting and lowering motion. The slewing mechanism is connected to the main body of the roadheader via a slewing table.

[0075] The cooling spray device b9 is designed to surround the cutting range of multiple cutting heads on the left and right sides. Each device has 22 fixed nozzles to directly spray high-pressure water on the cutting heads for cooling and dust removal.

[0076] The telescopic portion a4 is located between the cutting head and the cutting telescopic oil cylinder a2, and the cutting telescopic oil cylinder a2 enables the cutting head to have a telescopic function.

[0077] The telescopic portion a4 specifically includes: a telescopic protective tube b22, a telescopic outer tube b24, a telescopic inner tube b25, a key plate b23, a transmission shaft b21, and a driving spiral bevel gear b20.

[0078] Among them, the active spiral bevel gear b20 is used to transmit the power from the reducer a3, and is fixed on the transmission shaft b21.

[0079] The telescopic protective tube b22, telescopic outer tube b24, and telescopic inner tube b25 are sequentially sleeved on the transmission shaft b21 from the outside inward, with a key plate b23 located between the telescopic protective tube b22 and the telescopic outer tube b24. The key plate b23 primarily serves as a connection and fixation, transmitting power and motion between the telescopic protective tube and the telescopic outer tube.

[0080] The telescopic outer cylinder b24 is hinged to the cutting telescopic oil cylinder a2.

[0081] When the telescopic outer cylinder b24 extends toward the right cutting box b1, it abuts against the boss of the telescopic inner cylinder b25 to achieve retraction.

[0082] In this embodiment, the length of the intermediate fixing box is taken into consideration, and the travel of the telescopic portion is reduced to allow for two feeds. Specifically, considering the length of the intermediate fixing box, the travel of the telescopic portion is reduced by half, leaving a feed of 280 mm for two feeds, which is applied to step three of the construction method.

[0083] Increase the wall thickness of the telescopic protective tube and connect the telescopic protective tube and the intermediate fixed box b16 into one to improve strength.

[0084] The intermediate fixed box a8 includes:

[0085] The middle fixed box b16 is connected to the telescopic inner tube b25 and the telescopic protective tube b22, and the deceleration shaft b19 and the cutting shaft b8 are installed inside it.

[0086] The vent plug a5 and the oil window a6 are opened in the middle fixed box b16, and the cover plate a7 is on the upper part of the cutting part and is connected to the cutting part shell with fasteners such as high-strength bolts or pins to ensure the stability and safety of the connection.

[0087] The reduction shaft b19, the small reduction gear b17 and the large spiral bevel gear b18, the large spiral bevel gear b18 and the small reduction gear b17 are all mounted on the reduction shaft b19 (key connection);

[0088] The two ends of the reduction shaft b19 are respectively arranged in the middle fixed box b16 through the first bearing and the second bearing. The first bearing is adapted to the first bearing seat, and the second bearing is adapted to the second bearing seat. The first bearing seat and the second bearing seat are both fixed to the middle fixed box b16.

[0089] Cutting shaft b8 and large reduction gear b7; the large reduction gear b7 is mounted on the cutting shaft b8 and is key-connected to the cutting shaft b8.

[0090] The left fixed spiral bevel gear b13 and the left bearing seat b14, the left fixed spiral bevel gear b13 is fixed to the left bearing seat b14, and the left spiral bevel gear shaft b12 rotates around the left spiral bevel gear b13.

[0091] The right fixed spiral bevel gear b5 and the right bearing seat b6 are fixed to the right bearing seat b6. The right spiral bevel gear shaft b4 rotates around the right fixed spiral bevel gear b5.

[0092] The cutting shaft b8 is installed between the left bearing seat b14 and the right bearing seat b6 through bearings.

[0093] The cooling spray device b9 is externally arranged around the cutting range of the left and right cutting heads, and each device has 22 fixed nozzles to directly spray high-pressure water on the cutting heads to cool and reduce dust.

[0094] The cutting box a9 comprises a left cutting box and a right cutting box.

[0095] The left cutting box includes: a left cutting box body b15, a left spiral bevel gear shaft b12, a left connecting plate b11, and a left cutting head b10.

[0096] Specifically, the left connecting plate b11 is connected (fixed) with fasteners such as bolts and nuts to the left cutting head and the left spiral bevel gear shaft b12.

[0097] The left coupling plate b11 is fixed to the end of the left spiral bevel gear shaft b12 and the left connecting bearing seat;

[0098] The left connecting bearing seat is sleeved in the left mounting seat;

[0099] The left spiral bevel gear shaft b1 is installed on the left connecting bearing seat through a bearing.

[0100] The left coupling plate b11, the left connecting bearing seat, the left mounting seat, and the left bearing seat b14 are fixed in sequence, and the left bearing seat b14 is fixed to the middle fixing box a8.

[0101] The left coupling plate b11 can be quickly and easily disassembled and assembled, and also plays a role in transmitting twisting.

[0102] The left spiral bevel gear shaft b12 rotates around the left spiral bevel gear b13 , and the gear at the end of the left spiral bevel gear shaft b12 is meshed with the left spiral bevel gear b13 .

[0103] The left cutting box b15 is installed on one end of the cutting shaft b8 and is also installed on the left connecting bearing seat.

[0104] The left cutting head b10 is fixed to the left connecting disc b11 through the cutting disc.

[0105] The right cutting box includes: a right cutting box body b1, a right spiral bevel gear shaft b4, a right connecting plate b3, and a right cutting head b2.

[0106] Similarly, the right coupling plate b3 connects (fixes) the cutting head and the right spiral bevel gear shaft b4 through fasteners such as bolts and nuts.

[0107] The right coupling plate b3 is fixed to the end of the right spiral bevel gear shaft b4 and the right connecting bearing seat;

[0108] The right connecting bearing seat is set in the right mounting seat.

[0109] The right spiral bevel gear shaft b4 is installed on the right connecting bearing seat through a bearing.

[0110] The right coupling plate b3, the right connecting bearing seat, the right mounting seat, and the right bearing seat b6 are fixed in sequence, and the right bearing seat b6 is fixed to the middle fixed box a8.

[0111] The right cutting box b1 is installed on the other end of the cutting shaft b8 and is also installed on the right connecting bearing seat.

[0112] The right cutting head b2 is fixed to the right connecting disc b3 through the cutting disc.

[0113] Among them, the right spiral bevel gear shaft b4 rotates around the right fixed spiral bevel gear b5: the gear at the end of the right spiral bevel gear shaft b4 is meshed with the right fixed spiral bevel gear b5.

[0114] Thus, as the left and right cutting heads revolve downward toward the front wall as the cutting box body, the left cutting head b10 increases speed to rotate counterclockwise, and the right cutting head b2 increases speed to rotate clockwise.

[0115] The working principle of the intermediate fixed box A8: the large spiral bevel gear B18 is engaged with the driving spiral gear B20, thereby transmitting the speed to the small reduction gear B17 through the reduction shaft B19.

[0116] The small reduction gear b17 is engaged with the large reduction gear b7, and the large reduction gear b7 drives the cutting shaft b8 to rotate downward toward the front wall.

[0117] Construction method of tensile breaking hard rock tunnel boring machine:

[0118] FIG6 and FIG7 illustrate the present invention's excavation cutting groove and cyclic cutting, wherein the excavation steps are as follows:

[0119] Step 1: Cut from the lower middle part of the cross section, move from bottom to top, and repeat cutting to the width of the groove, as shown in Figure 6.

[0120] Step 2: The cutting head circulates left and right to cut both sides of the groove (from bottom to top, from the middle empty space upwards), see Figure 7.

[0121] Step 3: The telescopic cylinder can advance the knife twice, and repeat steps (1) and (2) to cut.

[0122] Step 4: Retract the cutting head, move the whole machine forward, and repeat the above method for the next cutting.

[0123] If the cut section is somewhat different from the actual required shape and size, it can be trimmed a second time to meet the cross-section size requirements.

[0124] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any way. Any person skilled in the art who, without departing from the scope of the present invention, makes any equivalent substitution, modification, or other changes to the technical solution and technical content disclosed in the present invention shall be deemed to be within the scope of the present invention and still fall within the scope of protection of the present invention.

Claims

1. A ripping hard rock tunneling machine, characterized in that, It includes a cutting part (8), and the cutting part (8) includes: A cutting motor (a1) and a speed reducer (a3). The cutting motor a1 is installed on the main body part (1), and the speed reducer (a3) is connected to the cutting motor (a1); the speed reducer (a3) is connected to the transmission shaft (b21) of the telescopic part (a4). A cutting telescopic oil cylinder (a2) that extends to achieve cutting feed. It is fixed to the cutting motor (a1), and its output end is hinged to the telescopic outer cylinder (b24) of the telescopic part (a4). The telescopic part (a4), located between the cutting head and the cutting telescopic oil cylinder (a2), includes: a driving spiral bevel gear (b20) for transmitting the power from the speed reducer (a3), which is fixed at the end of the transmission shaft (b21). And an intermediate fixed box (a8), which includes: An intermediate fixed box body (b16) that is connected to the telescopic inner cylinder (b25) and the telescopic protection cylinder (b22), and a reduction shaft (b19) and a cutting shaft (b8) are installed therein. The reduction shaft (b19), a small reduction gear (b17), and a large spiral bevel gear (b18). Both the large spiral bevel gear (b18) and the small reduction gear (b17) are installed on the reduction shaft (b19). The cutting shaft (b8) and a large reduction gear (b7); the large reduction gear (b7) is key-connected to the cutting shaft (b8); the cutting shaft (b8) is installed between the left bearing seat (b14) and the right bearing seat (b6) through bearings. A left fixed spiral bevel gear (b13) and a left bearing seat (b14). The left fixed spiral bevel gear (b13) is fixed to the left bearing seat (b14), and the gear at the end of the left spiral bevel gear shaft (b12) in the cutting box (a9) is externally meshed with the left spiral bevel gear (b13). A right fixed spiral bevel gear (b5) and a right bearing seat (b6). The right fixed spiral bevel gear (b5) is fixed on the right bearing seat (b6); the gear at the end of the right spiral bevel gear shaft (b4) in the cutting box (a9) is externally meshed around the right fixed spiral bevel gear (b5). The large spiral bevel gear (b18) is meshed with the driving spiral gear (b20), so as to Transmit the rotational speed to the small reduction gear (b17). The small reduction gear (b17) is meshed with the large reduction gear (b7), and the large reduction gear (b7) drives the cutting shaft (b8) to rotate.

2. The ripping hard rock tunneling machine according to claim 1, characterized in that, The telescopic part (a4) also includes: The telescopic protection cylinder (b22), the telescopic outer cylinder b24, and the telescopic inner cylinder (b25) are sleeved on the transmission shaft (b21) in sequence from outside to inside.

3. The ripping hard rock tunneling machine according to claim 1, characterized in that, The cutting box (a9) includes a left cutting box and a right cutting box with the same structure; among them, The left cutting box includes: a left cutting box body (b15), a left spiral bevel gear shaft (b12), a left coupling disk (b11), and a left cutting head (b10); the left coupling disk (b11) connects the left cutting head and the left spiral bevel gear shaft (b12). The left coupling disk (b11) is fixed to the end of the left spiral bevel gear shaft b12, the left connecting bearing seat. The left connecting bearing seat is sleeved in the left mounting seat. The left spiral bevel gear shaft (b1) is installed in the left connecting bearing seat through bearings. The left connection disc (b11), the left connection bearing seat, the left mounting seat, and the left bearing seat (b14) are fixed in sequence, and the left bearing seat (b14) is fixed to the intermediate fixed box (a8); The left cutting head (b10) is fixed to the left connection disc (b11) through the cutting disc; The left cutting box body (b15) is installed at one end of the cutting shaft (b8) and is simultaneously installed on the left connection bearing seat.

4. The ripping hard-rock tunneling machine according to claim 3, wherein, The right cutting box includes: a right cutting box body (b1), a right spiral bevel gear shaft (b4), a right connection disc (b3), and a right cutting head (b2); The right connection disc (b3) connects the cutting head and the right spiral bevel gear shaft (b4); The right connection disc (b3) is fixed to the end of the right spiral bevel gear shaft b4 and the right connection bearing seat; The right connection bearing seat is sleeved in the right mounting seat, and the right spiral bevel gear shaft (b4) is installed on the right connection bearing seat through a bearing; The right connection disc (b3), the right connection bearing seat, the right mounting seat, and the right bearing seat (b6) are fixed in sequence, and the right bearing seat (b6) is fixed to the intermediate fixed box (a8); The right cutting box body (b1) is installed at the other end of the cutting shaft (b8) and is simultaneously installed on the right connection bearing seat. The right cutting head (b2) is fixed to the right connection disc (b3) through the cutting disc.

5. The ripping hard rock tunneling machine according to claim 1, characterized in that, Both ends of the reduction shaft (b19) are respectively arranged in the intermediate fixed box body (b16) through a first bearing and a second bearing. The first bearing is adapted to the first bearing seat, and the second bearing is adapted to the second bearing seat; both the first bearing seat and the second bearing seat are fixed to the intermediate fixed box body (b16).

6. A construction method of a rock-breaking tunneling machine with tensile cracking, characterized in that, It includes the following steps: Step 1: Cut and feed from the middle lower part of the section, feed from bottom to top, and repeatedly cut out the groove width; Step 2: The cutting head cuts the two sides of the groove in a left - right cycle; Step 3: The cutting telescopic oil cylinder (a2) travels the stroke to feed twice, and repeat Steps 1 and 2 for cutting; Step 4: Retract the cutting head, the whole machine moves forward, and repeat the above method for the next cut.

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