A tunneling machine cutting device with impact rock breaking

Abstract

This utility model relates to the technical field of mining machinery and tunnel engineering equipment, and particularly to a tunneling machine device that combines down-the-hole hammer impact technology with a traditional cutting device, specifically a tunneling machine cutting device with impact rock breaking. The tunneling machine cutting device with impact rock breaking includes a tunneling machine cutting arm, a cutting head mounted on the cutting arm, a down-the-hole hammer mounted on the cutting head, and an air supply device for supplying air to the down-the-hole hammer mounted on the cutting head or the tunneling machine cutting arm. The air supply device delivers compressed gas to the down-the-hole hammer, causing it to move under the action of the gas, impacting the end face and generating impact force. Under the action of the impact force, the hard rock is loosened. As the tunneling machine cutting head rotates and cuts, the impact down-the-hole hammer, under the action of air pressure, hammers the rock wall, and the resulting impact force assists in rock breaking, significantly improving production efficiency. It can be used as a high-efficiency rock-breaking tunneling machine cutting head for hard rock or complex strata.

Description

Technical Field

[0001] This utility model relates to the technical field of mining machinery and tunnel engineering equipment, and in particular to a tunneling machine that combines down-the-hole hammer impact technology with a traditional cutting device. Specifically, it is a tunneling machine cutting device with impact rock breaking, which is suitable for efficient tunneling operations in hard rock formations. Background Technology

[0002] Tunnel boring machines (TBMs) are widely used in underground space construction such as coal mine roadways, mountain tunnels, and subway tunnels. Their cutting heads are the main actuators during operation. However, existing technologies present several challenges for traditional TBMs operating in hard rock formations, primarily: 1. Traditional cutting devices rely on continuous cutting with rollers or cutting teeth, resulting in a significant decrease in efficiency when rock hardness exceeds 80 MPa; 2. Severe wear of the cutting teeth leads to short tool life, low drilling efficiency, and high energy consumption (typically >3.5 kWh / m³); 3. Excessive vibration results in poor equipment stability and a high failure rate. Summary of the Invention

[0003] In order to solve the problems of low efficiency and severe wear of traditional tunneling machine cutting heads when operating in hard rock formations, this utility model provides a tunneling machine cutting device with impact rock breaking.

[0004] This utility model is achieved using the following technical solution: a tunneling machine cutting device with impact rock breaking, comprising a tunneling machine cutting arm, a cutting head mounted on the cutting arm, a down-the-hole hammer mounted on the cutting head, and an air supply device for supplying air to the down-the-hole hammer mounted on the cutting head or the tunneling machine cutting arm. The air supply device delivers compressed gas to the down-the-hole hammer, causing the hammer to move under the action of the gas, impacting the end face and generating impact force, which loosens the hard rock.

[0005] The aforementioned tunneling machine cutting device with impact rock breaking has multiple air holes evenly distributed on the cutting head, with down-the-hole hammers installed inside the air holes. Multiple air sleeves are installed on the tunneling machine cutting arm, and each air sleeve is connected to an air hole on the cutting head, using the air sleeves as air supply devices.

[0006] In the aforementioned tunneling machine cutting device with impact rock breaking, the air sleeve and the fixed sleeve are connected together by bolts, and the fixed sleeve is welded to the cutting arm, so that the air sleeve is installed on the tunneling machine cutting arm.

[0007] In the aforementioned tunneling machine cutting device with impact rock breaking, the down-the-hole hammer is fixed to the air hole by a fixing rod. The fixing rod is tightened in the air hole by a pad and a nut. The fixing rod is provided with an air hole, which is connected to the air hole on the cutting head. The air hole on the fixing rod is also connected to the down-the-hole hammer.

[0008] The aforementioned cutting device for a tunneling machine with impact rock breaking has an annular groove at the tail of each air hole on the cutting head. An end cover is provided at the annular groove, and a sealing ring is provided on the end cover. Bolts are also added to the end cover to fasten the end cover to the cutting head.

[0009] The aforementioned tunneling machine cutting device with impact rock breaking has a sealing ring added to the contact surface between the air jacket and the cutting head.

[0010] The aforementioned tunneling machine cutting device with impact rock breaking has multiple air holes evenly distributed on the cutting head. A down-the-hole hammer is installed inside the air holes. A universal joint is also installed on the cutting head. The universal joint has one air inlet and multiple air outlets. Each air outlet is connected to one air hole, and the universal joint is used as an air supply device.

[0011] In the aforementioned tunneling machine cutting device with impact rock breaking, the down-the-hole hammer is fixed to the air hole by a fixing rod. The fixing rod is tightened in the air hole by a pad and a nut. The fixing rod is provided with an air hole, which is connected to the air hole on the cutting head. The air hole on the fixing rod is also connected to the down-the-hole hammer.

[0012] The aforementioned tunneling machine cutting device with impact rock breaking mechanism uses a hydraulic down-the-hole hammer, with the corresponding air supply equipment replaced by a hydraulic supply equipment. In actual mining operations, a hydraulic down-the-hole hammer can be selected based on different conditions, and this solution also applies to hydraulic down-the-hole hammers.

[0013] As the cutting head of the tunneling machine rotates and cuts, the impact down-the-hole hammer strikes the rock wall under air pressure. The resulting impact force assists in rock breaking, greatly improving production efficiency. It can be used as a high-efficiency rock-breaking tunneling machine cutting head for hard rock or composite strata. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model.

[0015] Figure 2 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0016] In the diagram: 1-Tunneling machine cutting arm, 2-Fixed sleeve, 3-Air sleeve, 4-End cap, 5-Fixed rod, 6-Cutting head, 7-Down-the-hole hammer, 8-Rotary joint. Detailed Implementation

[0017] Although down-the-hole hammer (DHH) technology has been applied in drilling, existing technologies have not solved the problem of coordinated control with continuous cutting systems and lack integrated design for tunneling conditions. This invention achieves a coordinated operation design between a modular DHHH impact unit and the cutting section: a DHHH-cutting head coordinated structure employs multiple pneumatic DHHHH hammers (4-6) arranged in a ring around a central cutting head. The DHHHH hammers are installed at an angle, with the impact direction pointing towards the center of the cutting face. Each DHHHH hammer is independently pneumatically supplied. The pre-splitting-cutting operation process involves the DHHHH hammers first impacting to form a pre-splitting network, followed by the rotating cutting head breaking the pre-split rock mass.

[0018] Example 1: As Figure 1 As shown, the scheme includes a tunneling machine cutting arm 1, a fixed sleeve 2, an air sleeve 3, an end cap 4, a fixed rod 5, a cutting head 6, and a down-the-hole hammer 7. Compressed gas enters the air sleeve 3 through the air inlet at the right end. The cutting head 6 has 4-6 evenly distributed air holes, each with an annular groove at its tail end. The compressed gas passes through the air sleeve 3 to the air holes in the cutting head 6, and then through the air holes on the fixed rod 5 to enter the down-the-hole hammer 7. Under the action of the gas, the down-the-hole hammer 7 moves, impacting the end face and generating impact force, which loosens the hard rock. A sealing ring is added to the contact surface between the air sleeve 3 and the cutting head 6 to ensure air pressure sealing. The down-the-hole hammer 7 is installed at the front end of the air hole in the cutting head 6. The down-the-hole hammer 7 is fixed in the air hole by the fixing rod 5. The fixing rod 5 is tightened in the air hole by the pad and nut. The end cap 4 is installed in the annular groove at the rear. The end cap 4 is equipped with a sealing ring to prevent gas from flowing out from the rear. At the same time, bolts are added to the end cap 4 to fasten it to the cutting head 6. The air sleeve 3 and the fixing sleeve 2 are connected together by bolts, and the fixing sleeve 2 is welded to the cutting arm 1 to fix the fixing sleeve 2 and the air sleeve 3 in place so that they do not rotate.

[0019] Example 2: Figure 2 As shown, the scheme includes a tunneling machine cutting arm 1, a rotary joint 8, a fixed rod 5, a cutting head 6, and a down-the-hole hammer 7. Compressed gas enters the air hole on the fixed rod 5 through the air inlet at the right end of the rotary joint 8, and then enters the down-the-hole hammer 7. Under the action of the gas, the down-the-hole hammer 7 moves, impacting the end face and generating impact force, which loosens the hard rock. The cutting head 6 has 4-6 air holes evenly distributed, and the rotary joint 8 has one air inlet on the right side. Through the rotary joint 8, the gas is evenly distributed into 4 or 6 air paths. The down-the-hole hammer 7 is installed at the front end of the air hole of the cutting head 6, and is fixed into the air hole by the fixed rod 5. The fixed rod 5 is tightened in the hole by a pad and a nut.

[0020] By using the technology described in this application, the cutting efficiency of hard rock roadways is significantly improved. Practical application tests have demonstrated the significant advantages of this technical solution:

[0021] Construction efficiency: Drilling speed reaches 2-3 m / h in granite formations; efficiency is increased by 30-40% compared to traditional methods; tool life is extended by 2-3 times;

[0022] Economic benefits: Energy consumption is reduced by 25-30%; maintenance costs are reduced by 40%; and overall construction costs are reduced by 35%.

Claims

1. A cutting device for a tunneling machine with impact rock breaking, comprising a tunneling machine cutting arm (1), wherein a cutting head (6) is provided on the tunneling machine cutting arm (1), characterized in that: A down-the-hole hammer (7) is installed on the cutting head (6), and an air supply device for supplying air to the down-the-hole hammer (7) is also installed on the cutting head (6) or the cutting arm (1) of the tunneling machine.

2. The cutting device for a tunneling machine with impact rock breaking as described in claim 1, characterized in that: Multiple air holes are evenly distributed on the cutting head (6), and a down-the-hole hammer (7) is installed inside the air hole. Multiple air sleeves (3) are installed on the cutting arm (1) of the tunneling machine, and each air sleeve (3) is connected to an air hole on the cutting head (6).

3. The cutting device for a tunneling machine with impact rock breaking as described in claim 2, characterized in that: The air sleeve (3) and the fixed sleeve (2) are connected together by bolts, and the fixed sleeve (2) is welded to the cutting arm (1) so that the air sleeve (3) is installed on the cutting arm (1) of the tunneling machine.

4. A cutting device for a tunneling machine with impact rock breaking as described in claim 3, characterized in that: The down-the-hole hammer (7) is fixed to the air hole by the fixing rod (5). The fixing rod (5) is tightened in the air hole by the pad and nut. The fixing rod (5) is provided with an air hole. The air hole on the fixing rod (5) is connected to the air hole on the cutting head (6). The air hole on the fixing rod (5) is also connected to the down-the-hole hammer (7).

5. A cutting device for a tunnel boring machine with impact rock breaking as described in claim 4, characterized in that: An annular groove is provided at the tail of each air hole on the cutting head (6), and an end cap (4) is provided at the annular groove. A sealing ring is provided on the end cap (4), and bolts are added to the end cap (4) to fasten the end cap (4) to the cutting head (6).

6. A cutting device for a tunnel boring machine with impact rock breaking as described in claim 2, 3, 4, or 5, characterized in that: A sealing ring is added next to the air hole on the contact surface between the air jacket (3) and the cutting head (6).

7. A cutting device for a tunnel boring machine with impact rock breaking as described in claim 1, characterized in that: The cutting head (6) has multiple air holes evenly distributed on it, and a down-the-hole hammer (7) is installed inside the air holes. The cutting head (6) also has a rotary joint (8) installed on it. The rotary joint (8) has one air inlet and multiple air outlets, and each air outlet is connected to one air hole.

8. A cutting device for a tunnel boring machine with impact rock breaking as described in claim 7, characterized in that: The down-the-hole hammer (7) is fixed to the air hole by the fixing rod (5). The fixing rod (5) is tightened in the air hole by the pad and nut. The fixing rod (5) is provided with an air hole. The air hole on the fixing rod (5) is connected to the air hole on the cutting head (6). The air hole on the fixing rod (5) is also connected to the down-the-hole hammer (7).

9. A cutting device for a tunnel boring machine with impact rock breaking as described in claim 1, characterized in that: The down-the-hole hammer (7) is a hydraulic down-the-hole hammer, and the corresponding air supply equipment is replaced with a liquid supply equipment.

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