Coal mine roadway floor bulge relief groove cutting device

Abstract

This invention discloses a cutting device for preventing floor heave and pressure relief groove cutting in coal mine roadways. A handle and control panel are provided at the end of a push rod, which is connected to the rear of a tracked vehicle. The tracked vehicle has a working shaft and axles at its lower part, with track wheels mounted at both ends of the axles. The working shaft is equipped with a transmission mechanism, and a turntable is radially fixedly connected to its center. Multiple telescopic frames are radially installed between the working shaft and the turntable. Each telescopic frame has a bottom-breaking tip or a cleaning plate attached to its outer end via a snap-fit. Symmetrical slag storage pipes and symmetrical slag guide plates are spaced apart on both sides of the turntable. A pair of slag storage pipes are fixedly installed on the tracked vehicle, with each slag storage pipe on each side supported by two support rods. A slag guide plate is connected to the outer edge of each slag storage pipe on each side. This device ensures the integrity of the pressure relief groove walls and minimizes damage to other areas of the floor during pressure relief groove construction.

Description

Technical Field

[0001] This invention belongs to the field of coal mine safety mining technology and relates to a cutting device for preventing and controlling the bottom heave of coal mine roadways. Background Technology

[0002] With increasing coal mining depth, the problem of floor heave caused by high stress has become increasingly prominent, seriously affecting the safe and efficient production of mines. Due to the complexity of mine geological conditions, many roadway floors are made of soft rock or have coal seam left in the floor during roadway excavation, thus increasing the probability of floor heave. Currently, the most direct on-site treatment for floor heave is to remove the floor. However, when the soft rock or coal seam is thick, floor heave may recur after removal, and the removal work is extensive, requiring a large investment of manpower and resources. Therefore, domestic and foreign experts and scholars have proposed various methods to address floor heave, such as installing anchor bolts in the floor, using sealed supports, grouting the floor, drilling large-diameter holes in the floor, and cutting grooves in the roadway floor.

[0003] Roadway floor grooving refers to the pre-excavation of grooves of a certain width and depth in the roadway floor. Its purpose is to release stress in a controlled manner, minimizing the impact of floor heave on mine production. Existing methods for excavating floor stress relief grooves mainly include floor blasting and floor sawing. Floor blasting causes significant damage to the floor, and the blasting range cannot be precisely controlled. Floor sawing has low construction efficiency, and the coal and rock mass within the stress relief groove is difficult to remove after sawing. Therefore, there is an urgent need to develop a more scientific and effective method for excavating floor stress relief grooves. Summary of the Invention

[0004] The purpose of this invention is to provide a cutting device for the pressure relief groove of the bottom plate in coal mine roadways to prevent bottom heave. This device solves the problems in the prior art, such as the large damage to the bottom plate caused by blasting excavation, the inability to accurately control the blasting range, the low construction efficiency of bottom plate sawing excavation, and the difficulty in removing coal and rock mass from the pressure relief groove after sawing.

[0005] The technical solution adopted in this invention is a cutting device for preventing bottom heave and pressure relief grooves in coal mine roadways, comprising a push rod, a handle at the end of the push rod, a control panel on the handle, a front end of the push rod connected to the rear of a tracked vehicle, a working shaft and at least one wheel axle respectively on the lower part of the tracked vehicle, tracked wheels installed at both ends of the wheel axle, a transmission mechanism configured on the working shaft, a turntable radially fixedly connected to the middle of the working shaft, and multiple telescopic frames radially installed between the working shaft and the turntable, a buckle at the outer end of each telescopic frame, and a bottom-breaking tip or a groove-cleaning plate installed at the outer end of each buckle according to the needs of the working state;

[0006] Symmetrical slag storage pipes and symmetrical slag guide plates are set at intervals on both sides of the turntable. A pair of slag storage pipes are fixedly installed on the tracked vehicle. Each slag storage pipe on each side is supported by two support rods. A slag guide plate is connected to the outer edge of each slag storage pipe on each side.

[0007] The present invention provides a cutting device for preventing and controlling floor bulging in coal mine roadways, characterized in that:

[0008] The telescopic frame can extend and shorten radially relative to the center of the pivot.

[0009] The cleaning plate is a semi-circular arc shape, with a partition installed at the center point of the bottom end of the arc.

[0010] The slag storage pipe is 3 / 4 arc-shaped.

[0011] The control buttons on the control panel are used to control the overall forward movement of the device, the rotation speed of the turntable, and the extension / retraction position of the telescopic frame.

[0012] The beneficial effects of this invention are that it achieves simultaneous cutting and slotting of the pressure relief groove in the base plate, greatly improves the construction efficiency of the pressure relief groove, effectively ensures the integrity of the two walls of the pressure relief groove, and at the same time minimizes the damage to other areas of the base plate caused by the construction of the pressure relief groove. Attached Figure Description

[0013] Figure 1 A simplified structural diagram of the device of the present invention in its working state when the bottom-breaking tip is installed;

[0014] Figure 2 A simplified structural diagram of the working state of the device of the present invention when the cleaning plate is installed;

[0015] Figure 3 yes Figure 2 aa cross section diagram;

[0016] Figure 4 yes Figure 2 bb cross section diagram;

[0017] Figure 5 This is a simplified front view of the device of the present invention during operation in the pressure relief tank;

[0018] Figure 6 yes Figure 5 The cc section diagram in the middle;

[0019] Figure 7 This is a cross-sectional schematic diagram of the bottom slab of a coal mine roadway, which is the subject of this invention.

[0020] Figure 8 This is a cross-sectional view of the pressure relief groove after the device of the present invention has performed cutting and cleaning.

[0021] In the diagram, 1. Handle; 2. Control panel; 3. Push rod; 4. Telescopic frame; 5. Track wheel; 6. Buckle; 7. Bottom-breaking tip; 8. Tunnel floor; 9. Slot cleaning plate; 10. Slag storage pipe; 11. Pressure relief trough; 12. Slag guide plate; 13. Turntable; 14. Support rod; 15. Partition plate. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] Existing cutting machines are not easy to groove after cutting, while trenching machines are not suitable for trenching operations when encountering strong base plates. Therefore, the present invention is needed. This invention device integrates bottom breaking and grooving.

[0024] Reference Figure 1 , Figure 2 , Figure 5 The structure of the device of the present invention includes a push rod 3, with a handle 1 at the end of the push rod 3 and a control panel 2 on the handle 1. The front end of the push rod 3 is connected to the rear of the tracked vehicle. The lower part of the tracked vehicle is provided with a working shaft and at least one wheel axle. Tracked wheels 5 are installed at both ends of the wheel axle. (The tracked wheels are easy to adapt to the complex underground environment, but are difficult to propel. The tracked wheels have their own power devices and pneumatic devices. Otherwise, it would be difficult to push the tracked vehicle forward manually. Their speed can be controlled by the control panel 2.) The working shaft is separately equipped with a transmission mechanism. A turntable 13 is radially fixedly connected to the middle of the working shaft and driven by the transmission mechanism. The shaft enables the rotation of the turntable 13. Multiple telescopic frames 4 are installed radially between the working shaft and the turntable 13. Each telescopic frame 4 has a buckle 6 at its outer end. Each buckle 6 has a bottom-breaking tip 7 or a cleaning plate 9 installed at its outer end according to the working conditions. Symmetrical slag storage pipes 10 and symmetrical slag guide plates 12 are arranged at intervals on both sides of the turntable 13. A pair of slag storage pipes 10 are fixedly installed on the tracked vehicle. Each slag storage pipe 10 on each side is supported by two support rods 14. Each slag storage pipe 10 on each side is connected to a slag guide plate 12 at its outer edge. Neither the slag storage pipes 10 nor the slag guide plates 12 rotate with the turntable 13.

[0025] The cleaning plate 9 is a semi-circular arc with a semi-circular cross-section. A baffle 15 is installed at the center point of the bottom of the arc to divert the crushed coal and rock mass (hereinafter referred to as crushed coal mass). See Figure 3 Section aa in the middle;

[0026] The telescopic frame 4 has a semi-circular cross-section. The bottom-breaking tip 7 and the cleaning plate 9 can extend and retract radially relative to the center of the rotating shaft, driven by the telescopic frame 4, thus adjusting the depth of the trenching and cleaning operations. (See attached image.) Figure 4 The bb section in the middle.

[0027] The slag storage pipe 10 is a 3 / 4 arc shape, used to catch the broken coal that slides down from the top of the cleaning plate 9. (See...) Figure 6 The cc section in the middle.

[0028] The handle 1 is equipped with a control panel 2, and the various control buttons in it are used to control the overall forward movement of the device (the control panel 2 is needed to control the overall forward speed, and the handle 1 is used to control the left and right directions), the rotation speed of the turntable 13, and the extension and retraction position of the telescopic frame 4.

[0029] The working principle of cleaning the pressure relief trough 11 is as follows: a cleaning plate 9 is installed on the outer end of all the buckles 6. The turntable 13 rotates and drives the cleaning plate 9 to scoop out the broken coal body downward and backward. Since the rotation speed of the turntable 13 and the cleaning plate 9 is not high, the broken coal body will basically not be thrown out of the cleaning plate 9. It will only slide down the edge of the cleaning plate 9 with gravity as the cleaning plate 9 rotates to a high position and fall into the slag storage pipe 10 installed on both sides of the turntable 13. The partition plate 15 plays a diversion role. The outer end of the slag storage pipe 10 has a certain downward slope. The broken coal body slides out of the two outer ends of the slag storage pipe 10 and then slides down to the ground through the slag guide plate 12.

[0030] The working principle of the device of the present invention is as follows:

[0031] First, refer to Figure 7 Draw the outline of the pressure relief groove 11 to be constructed on the centerline of the roadway floor 8 or in areas with severe floor heave. The width of the drawn pressure relief groove 11 is 15-25cm, which determines the accurate position for cutting the pressure relief groove 11. At the end of the longitudinal starting position of the drawn pressure relief groove 11, a rectangular placement groove is artificially excavated. The dimensions of this placement groove are 100cm long, 20cm wide, and 50cm deep along the roadway direction, which is used for equipment placement before the device of this invention is put into operation.

[0032] Then, a bottom-breaking tip 7 is installed at the outer end of each telescopic frame 4. After the installation is secure, the ventilation pipe is connected, and the handle 1 is held to start the device of the present invention. The ground coal and rock within the outline of the pressure relief groove 11 are crushed along the outline of the pressure relief groove 11. The device of the present invention is operated to break the bottom in multiple back-and-forth cycles to crush the coal and rock within the outline of the pressure relief groove 11. The crushing process is close to the outline of both sides of the pressure relief groove 11 to ensure the integrity of the two walls of the pressure relief groove 11 after completion.

[0033] Finally, all the bottom-breaking tips 7 are replaced with cleaning plates 9, and slag storage pipes 10 and slag guide plates 12 are installed on both sides of the turntable 13. The device of the present invention is pushed back and forth repeatedly to clean the broken coal in the pressure relief trough 11. The broken coal is carried to a high place by the cleaning plates 9 and transported into the slag storage pipes 10. Then it falls along the two outer ends of the slag storage pipes 10 onto the slag guide plates 12, and finally discharged outside the outline of the pressure relief trough 11, thus completing the removal of the broken coal in the pressure relief trough 11.

[0034] The working process of this invention includes the following steps:

[0035] Step 1, refer to Figure 7 The outline of the pressure relief groove 11 is painted on the bottom drum position of the tunnel floor 8 with spray paint. The pressure relief groove 11 is usually located on the central axis of the tunnel. The position of the pressure relief groove 11 that needs to be cut can be adjusted according to the position of the bottom drum on site.

[0036] The width of the pressure relief groove 11 is 15-25cm and the depth is 50-100cm. The specific dimensions are designed according to the condition of the floor drum on site.

[0037] Step 2: Manually cut a groove at the beginning of the outline of the pressure relief groove 11 for initial placement before the device of the present invention is put into operation;

[0038] The manually excavated trench is 100cm long, 20cm wide, and 50cm deep.

[0039] Step 3: Install all the bottom-breaking tips 7, place the device of the present invention into the manual shovel, connect the ventilation pipe, hold the handle 1 and start the device of the present invention. Break the coal and rock mass within the range of the pressure relief groove 11 according to the outline of the drawn pressure relief groove 11.

[0040] During the crushing process, the coal and rock mass in the pressure relief groove 11 can be crushed repeatedly according to the width of the pressure relief groove 11 and the hardness of the coal and rock mass at the bottom plate. The cutting depth of the pressure relief groove 11 can also be adjusted by controlling the extension and retraction of the telescopic frame 4 through the control panel 2 on the handle 1 according to the design depth of the pressure relief groove 11, thereby completing the crushing.

[0041] Step 4: Replace all the bottom-breaking tips 7 with cleaning plates 9, install slag storage pipes 10 and slag guide plates 12 on both sides of the turntable 13, and remove the broken coal in the pressure relief trough 11.

[0042] During the cleaning process, the broken coal within the pressure relief trough 11 is cleaned through multiple cycles based on its width. The broken coal is transported to the slag guide plate 12 via the cleaning plate 9 and the slag storage pipe 10, and then discharged to both sides of the pressure relief trough 11, completing the cleaning process. Figure 8 .

Claims

1. A device for cutting the pressure relief groove of the bottom plate in a coal mine roadway to prevent floor bulging, characterized in that: Includes a push rod (3), the end of the push rod (3) is provided with a handle (1), the handle (1) is provided with a control panel (2), the front end of the push rod (3) is connected to the rear of the tracked vehicle, the lower part of the tracked vehicle is provided with a working shaft and a wheel axle respectively, the two ends of the wheel axle are equipped with tracked wheels (5), the working shaft is equipped with a transmission mechanism, the middle of the working shaft is radially fixedly connected with a turntable (13), and multiple telescopic frames (4) are installed radially between the working shaft and the turntable (13). Each telescopic frame (4) is provided with a buckle (6) at its outer end, and each buckle (6) is equipped with a bottom-breaking tip (7) or a cleaning plate (9) at its outer end according to the working state requirements. Symmetrical slag storage pipes (10) and symmetrical slag guide plates (12) are arranged at intervals on both sides of the turntable (13). A pair of slag storage pipes (10) are fixedly installed on the tracked vehicle. Each slag storage pipe (10) on each side is supported by two support rods (14). Each slag storage pipe (10) on each side is connected to a slag guide plate (12) on its outer edge.

2. The device for cutting the pressure relief groove of the bottom plate in coal mine roadway according to claim 1, characterized in that: The telescopic frame (4) can extend and shorten radially relative to the center of the pivot.

3. The device for cutting the pressure relief groove of the bottom plate in coal mine roadway according to claim 1, characterized in that: The cleaning plate (9) is a small semi-circular arc shape, with a partition (15) installed at the center point of the bottom of the arc.

4. The device for cutting the pressure relief groove of the bottom plate in coal mine roadways according to claim 1, characterized in that: The slag storage pipe (10) is 3 / 4 arc-shaped.

5. The device for cutting the pressure relief groove of the bottom plate in coal mine roadway according to claim 1, characterized in that: The control buttons in the control panel (2) are used to control the overall forward movement of the device, the rotation speed of the turntable (13), and the telescopic position of the telescopic frame (4).

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