A high torque drilling rig for coal mines

Abstract

The present invention relates to a high-torque drilling rig for coal mines, comprising a chassis, a large-disc slewing mechanism, a steady-drilling support assembly and a guide rail assembly. The slewing large disk in the large-disc slewing mechanism is rotatably arranged on the chassis, and the guide rail assembly and the steady-drilling support assembly are both arranged on the slewing large disk. A low-speed high-torque motor for driving the drilling tool to rotate is installed on the guide rail assembly; the steady-drilling support assembly comprises a column assembly, a front support assembly and a rear support assembly that can provide various supports for the drilling rig; the guide rail assembly comprises a guide rail and a linear drive mechanism for realizing the forward and backward movement of the guide rail; the output shaft of the low-speed high-torque motor is connected to the drill rod in the drilling tool through a drill rod connecting assembly, and the drill rod connecting assembly is used to realize the transmission of torque and push-pull force to the drill rod. The drilling rig can realize low-speed high-torque output and the transmission of push-pull force, and when the drilling hole back expansion generates a huge pulling force, the stable operation of the equipment is ensured by the steady-drilling support assembly.

Description

Technical Field

[0001] The invention belongs to the field of underground drilling equipment for coal mines, and in particular relates to a high-torque drilling rig for coal mines. Background Art

[0002] Drilling rigs are commonly used drilling equipment in coal mines. Depending on the construction requirements, the functions of drilling rigs will be different. Existing drilling rigs are generally crawler drilling rigs with high-speed, low-torque motors and reducers to achieve torque output. The drilling tools have the characteristics of high-speed, low-torque and low-speed, high-torque, and are suitable for ordinary small-diameter drilling. If you want to achieve high torque or deep hole drilling, you need special high-torque drilling tools, especially for horizontal drilling and expansion drilling rigs in coal pillar areas. The current equipment cannot meet the high torque and large pull-out force required for expansion, and it is also unable to provide stable support for the equipment during expansion drilling. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that conventional drilling rigs cannot achieve horizontal back-expansion drilling in the coal pillar area, and to invent a high-torque drilling rig for horizontal drilling and expansion. The drilling rig can achieve low-speed high-torque output and transmission of push-pull forces, and when the back-expansion of the drilling generates a huge pulling force, the stable operation of the equipment is ensured by the stable drill support assembly.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a high-torque drilling rig for coal mines, including a chassis, a large disc rotating mechanism, a steady drill support assembly and a guide rail assembly. The rotating large disc in the large disc rotating mechanism is rotatably arranged on the chassis, and the guide rail assembly and the steady drill support assembly are both arranged on the rotating large disc, and a low-speed high-torque motor for driving the drill tool to rotate is installed on the guide rail assembly; the steady drill support assembly includes a column assembly that can provide upper support for the drilling rig, a front support assembly that can provide front support for the drilling rig, and a rear support assembly that can provide rear support for the drilling rig; the guide rail assembly includes a guide rail and a linear drive mechanism for realizing the forward and backward movement of the guide rail; the output shaft of the low-speed high-torque motor is connected to the drill rod in the drilling tool through a drill rod connecting assembly, and the drill rod connecting assembly is used to realize the transmission of torque and push-pull force to the drill rod.

[0005] A power adapter is provided between the drill rod connecting assembly and the output shaft of the low-speed and high-torque motor. The power adapter includes a fixed housing, a rotating shaft and a bearing. The fixed housing is fixedly connected to the body of the low-speed and high-torque motor. The rotating shaft is rotatably installed inside the fixed housing through a bearing. One end of the rotating shaft is directly connected to the output shaft of the low-speed and high-torque motor to transmit torque, and the other end of the rotating shaft is connected to the drill rod through the drill rod connecting assembly.

[0006] The drill rod connection assembly includes a pull-transmitting disc, a connecting shaft and a pressure cover, wherein the pull-transmitting disc is sleeved on the rotating shaft and fixedly connected to the rotating shaft; the pressure cover is sleeved on the connecting shaft and connected to the pull-transmitting disc, thereby pressing the connecting shaft against the end face of the rotating shaft; the connecting shaft and the rotating shaft are connected via a torque transmission structure, the drill rod is mounted on the connecting shaft, and the torque is transmitted from the rotating shaft to the drill rod via the torque transmission structure.

[0007] The end of the connecting shaft is provided with a radial boss, and the gland can be clamped on the radial boss.

[0008] The end surface of the pull-transfer disc is provided with circumferentially distributed threaded holes, and the end surface of the pressure cover is provided with circumferentially distributed circular holes. Bolts are passed through the circular holes and the threaded holes to connect the pressure cover and the pull-transfer disc, thereby realizing the connection.

[0009] The following two methods can be used to position the connecting shaft: first, the connecting shaft is positioned by a stopper structure between the rotating shaft and the connecting shaft; second, the rotating shaft and the pressure cover are matched by a stopper structure to position the pressure cover, and the connecting shaft is positioned by a stopper structure between the pressure cover and the connecting shaft.

[0010] The column assembly is provided with two groups, and the column assembly comprises an outer column and an internal oil cylinder arranged in the outer column. The internal oil cylinder pushes the vertical support part to extend and retract up and down to realize the upper support of the drilling rig.

[0011] An angle adjustment component is also provided between the column component and the guide rail component to adjust the pitch angle of the guide rail.

[0012] The angle adjustment assembly includes an angle adjustment power mechanism and an angle adjustment bracket. One end of the angle adjustment bracket is hinged on the column assembly, and the other end is connected to the angle adjustment power mechanism. The guide rail is installed on the track surface of the angle adjustment bracket. Under the push of the linear drive mechanism, the guide rail can move back and forth along the track surface, and the pitch angle adjustment of the guide rail is achieved under the telescopic action of the angle adjustment power mechanism.

[0013] The chassis is a crawler track disc, comprising a crawler walking mechanism and a ground-supporting oil cylinder. A hydraulic oil tank, a power system and an operating mechanism are also arranged on the crawler chassis.

[0014] The present invention has the following innovations and advantages: compared with the prior art, the present invention realizes the overall upper and lower stable support of the drilling rig equipment through the cooperation of the upper support of the column assembly and the supporting cylinder on the crawler chassis; through the front and rear supports of the guide rails, the guide rails can be supported front and back when being pulled out, ensuring the stability of the equipment during back-expansion drilling; the low-speed and high-torque motor directly drives the drill tool to rotate through the drill rod connecting assembly, ensuring the low-speed stability of the equipment during back-expansion drilling and improving the equipment operation efficiency, and the drill rod connecting assembly can not only realize the fast and efficient transmission of torque, but also realize the transmission of push and pull forces during the back-expansion drilling process, ensuring the smooth progress of the back-expansion drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the steady drilling support assembly and the guide rail assembly in the present invention;

[0017] Figure 3 It is a side view of the steady drilling support assembly and the guide rail assembly of the present invention;

[0018] Figure 4 It is a structural schematic diagram of the drilling rotary device in the present invention;

[0019] Figure 5 It is a structural schematic diagram of a fixed box on the power adapter of the present invention;

[0020] Figure 6 It is a structural schematic diagram of the drill pipe connection assembly in the present invention;

[0021] Markings in the figure: 1. crawler chassis, 2. power system, 3. operating mechanism, 4. hydraulic oil tank, 5. large plate rotation mechanism, 501, rotating large plate, 6. stable drilling support assembly, 7. guide rail assembly, 8. drilling rotation device;

[0022] 601, column assembly, 601a, vertical support portion, 601b, outer column, 601c, lifting cylinder, 601d, hoop, 602, front support assembly, 603, rear support assembly;

[0023] 701, guide rail, 702, angle adjustment assembly, 702a, angle adjustment bracket, 702b, angle adjustment cylinder, 703, translation cylinder;

[0024] 801. Low-speed, high-torque motor; 802. Power adapter; 802a. Rotating shaft; 802b. Bearing; 802c. Sealing structure; 802d. Fixed housing; 802d-1. Medium inflow interface; 802d-2. Medium outflow interface; 803. Drill pipe connection assembly; 803a. Pull plate; 803b. Connecting shaft; 803b-1. Radial boss; 803c. Pressure cover. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the invention in any way.

[0026] As shown in the accompanying drawings, a high-torque drilling rig for coal mines includes a crawler chassis 1, a power system 2, an operating mechanism 3, a hydraulic oil tank 4, a large plate rotation mechanism 5, a steady drill support assembly 6 and a guide rail assembly 7.

[0027] The crawler chassis 1 includes a crawler walking mechanism and a ground-supporting cylinder. The crawler walking mechanism realizes the free movement of the equipment, and the ground-supporting cylinders arranged at the four corners of the crawler chassis 1 realize the supporting function of the equipment; the power system 2 is fixed on the crawler chassis 1, and includes a motor and a hydraulic pump. The rotation of the motor drives the hydraulic pump to rotate, so that the hydraulic pump can suck low-pressure oil from the hydraulic oil tank 4 and output high-pressure oil by doing work; the operating mechanism 3 performs operations such as reversing, adjusting the flow rate, and adjusting the pressure of the high-pressure oil output by the hydraulic pump in the power system so that the hydraulic oil enters the actuator and drives the actuator to move. The actuator is each cylinder set for the equipment; the hydraulic oil tank 4 is fixed on the crawler chassis 1, and provides low-pressure oil for the hydraulic pump of the power system 2. At the same time, the stored hydraulic oil and the oil tank body are used to cool the hydraulic oil after working.

[0028] The large plate rotating mechanism 5 is fixed on the crawler chassis 1, and can realize the rotation of the rotating large plate 501 and other mechanisms on the rotating large plate 501. At the same time, through the connection with the chassis, the column assembly 601 in the stable drilling support assembly 6 can directly apply force to the crawler chassis 1 when supporting upward, thereby maintaining the stability of the equipment during construction.

[0029] The column assembly 601 in the stable drilling support assembly 6 is provided with two groups, and the column assembly 601 includes an outer column 601b fixed on the rotating plate 501. An internal oil cylinder is provided in the column cavity of the outer column 601b, which can drive the connected vertical support part 601a to vertically extend and retract up and down to press against the upper top plate to achieve upper support for the drilling rig equipment. An upper support plate is also provided at the top end of the vertical support part 601a, and a conical fixing head protruding from the plate surface is provided on the upper support plate to improve the stability of the support.

[0030] A crossbeam is also provided between the outer columns 601b of the two column assemblies 601. Both ends of the crossbeam are slidably mounted on the outer columns 601b through clamps 601d. The clamps 601d are fixedly connected to the cylinder body of the lifting cylinder 601c. When the piston of the lifting cylinder 601c extends downward, the crossbeam can be lifted.

[0031] The guide rail assembly 7 includes a guide rail 701, which is installed on the crossbeam through an angle adjustment assembly 702. The angle adjustment assembly 702 includes an angle adjustment bracket 702a and an angle adjustment cylinder 702b. One end of the angle adjustment bracket 702a is hinged on the crossbeam, and the other end is rotatably connected to the piston of the angle adjustment cylinder 702b. The cylinder end of the angle adjustment cylinder 702b is hinged on the rotating plate 501. Under the telescopic action of the angle adjustment cylinder 702b, the pitch angle adjustment of the angle adjustment bracket 702a can be achieved.

[0032] The guide rail 701 is slidably arranged on the slideway of the angle adjustment bracket 702a, and the guide rail 701 is moved forward and backward on the slideway by the provided translation oil cylinder 703. The cylinder body of the translation oil cylinder 703 is fixed on the angle adjustment bracket 702a, and the piston is fixedly connected to the guide rail 701. The guide rail 701 is installed with a drilling tool for drilling holes and a drilling rotary device 8 for driving the drill rod to rotate. The angle adjustment component 702 adjusts the angle adjustment bracket 702a to adjust the pitch angle of the guide rail 701, and further adjusts the drilling direction of the drilling tool.

[0033] The stable drilling support assembly 6 also includes a front support assembly 602 and a rear support assembly 603 arranged at the front and rear ends of the guide rail 701. In this embodiment, the front support assembly 602 is fixed at the front end of the guide rail 701. When the guide rail 701 moves forward, the front support plate in the front support assembly 602 is supported on the coal pillar in front. The rear support assembly 603 has a telescopic cylinder, which is installed between the upper and lower planes of the guide rail 701. The piston of the telescopic cylinder is connected to the rear support plate. Through the action of the telescopic cylinder, the rear support plate is extended backward to support the coal wall or rock wall. In this way, the front and rear support of the equipment can be achieved through the front support assembly 602 and the rear support assembly 603.

[0034] During implementation, the front support assembly 602 can also be controlled by the telescopic cylinder to move forward and backward, and at this time, the rear support assembly 603 is fixed to the rear end of the guide rail.

[0035] Furthermore, the front support plate and the rear support plate are both provided with a plurality of conical fixing heads protruding from the plate surface, which can increase the friction between the coal pillar, coal wall or rock wall during support, thereby improving the stability of support.

[0036] The drilling rotary device 8 adopts a low-speed, high-torque motor 801 and a power adapter 802 and a drill rod connecting assembly 803 for transmitting torque and push-pull forces. The power adapter 802 includes a fixed housing 802d, a rotating shaft 802a and a bearing 802b. The fixed housing 802d is fixedly connected to the body of the low-speed, high-torque motor 801. The rotating shaft 802a is rotatably mounted inside the fixed housing 802d through a bearing 802b. One end of the rotating shaft 802a is directly connected to the output shaft of the low-speed, high-torque motor 801 through a spline or a flat key to transmit torque. The other end of the rotating shaft 802a is connected to the drill rod through the drill rod connecting assembly 803 to realize the transmission of torque and push-pull forces to the drill rod.

[0037] The bottom of the fixed box 802d is connected to the propulsion cylinder on the guide rail 701, and the propulsion cylinder pushes the drilling rotary device 8 to move forward and backward along the guide rail 701 to achieve drilling and back-expansion of the drilling tool.

[0038] In order to cool the bearing 802b, a circulating cooling medium is connected to the fixed box 802d. Therefore, a medium inlet interface 802d-1 and a medium outlet interface 802d-2 are respectively provided on the fixed box 802d, and a sealing structure 802c is provided between the box cover at both ends of the fixed box 802d and the rotating shaft 802a to prevent leakage of the cooling medium.

[0039] The bearings 802b are tapered roller bearings, and are arranged in pairs at both ends of the rotating shaft 802a. While realizing the rotation of the rotating shaft 802a, they can also transmit axial push and pull forces.

[0040] The drill pipe connection assembly 803 includes a transmission pull disc 803a, a connecting shaft 803b and a pressure cover 803c. The end of the rotating shaft 802a on the power adapter 802 is processed with an external thread, and the transmission pull disc 803a is processed with an internal thread that matches it. The transmission pull disc 803a is fixed to the outside of the rotating shaft 802a by threaded connection. The end face of the transmission pull disc 803a is provided with a plurality of threaded holes along the circumferential direction. The end or end face of the rotating shaft 802a and one end of the connecting shaft 803b are connected and transmit torque through a torque transmission structure; one end of the connecting shaft 803b is provided with a radial boss 803b-1, and the end face cooperates with the rotating shaft 802a to transmit torque, and the other end of the connecting shaft 803b is connected to the drill pipe; the pressure cover 803c is a hollow rotary The body is hollow in the center and can be sleeved on the connecting shaft 803b until it is stuck in the radial boss 803b-1 position of the connecting shaft 803b. A plurality of circular holes are evenly distributed along the circumference on the end face of the pressure cover 803c. The number of the circular holes is consistent with the number of the threaded holes on the pulling and transferring disk 803a. Then, bolts are passed through these circular holes and the threaded holes of the pulling and transferring disk 803a for threaded connection, and the connecting shaft 803b is pressed onto the end face of the rotating shaft 802a. In this way, the push-pull force of the rotating shaft 802a can be transmitted to the connecting shaft 803b by using the evenly distributed bolts. A convex stop is provided at the end of the rotating shaft 802a, and a concave stop is provided at the corresponding end of the connecting shaft 803b to cooperate with the convex stop. The two cooperate to realize the positioning of the connecting shaft 803b to ensure the coaxiality of the connecting shaft 803b and the rotating shaft 802a.

[0041] The torque transmission structure realizes torque transmission through convex-concave matching, for example, a spline and keyway matching structure, the spline is set on the rotating shaft 802a, the keyway is set on the connecting shaft 803b, or the spline is set on the connecting shaft 803b, and the keyway is set on the rotating shaft 802a; or the torque transmission structure is a matching structure of a boss and a groove similar to a spline, or it can be a cylindrical pin structure, and pin holes for installing cylindrical pins are provided on the end faces of the rotating shaft 802a and the connecting shaft 803b, and the two ends of the cylindrical pin are respectively fixed in the pin holes on the end faces of the rotating shaft 802a and the connecting shaft 803b.

[0042] The connecting shaft 803b can also be positioned indirectly, that is, through the pressure cover 803c. Specifically, the rotating shaft 802a and the pressure cover 803c are matched through a stopper structure to achieve the positioning of the pressure cover 803c, and the pressure cover 803c and the connecting shaft 803b are matched through a stopper structure to achieve the positioning of the pressure cover 803c on the connecting shaft 803b, thereby ensuring the coaxiality of the connecting shaft 803b and the rotating shaft 802a.

[0043] The installation of the drill rod and the connecting shaft 803b adopts a common form in the art, that is, the end of the connecting shaft 803b is processed into a conical surface to achieve fixed installation with the drill rod.

[0044] In order to facilitate the disassembly of the pressure cover 803c, a disassembly hole is provided on the pressure cover 803c, and the disassembly hole can be a threaded hole. In this way, when disassembling the pressure cover 803c, the bolt can be screwed into the disassembly hole and pressed against the transfer plate 803a. The bolt can be tightened continuously to realize the ejection and disassembly of the pressure cover 803c.

[0045] During construction, the equipment is moved to the construction position through the crawler chassis 1, and the rotary plate 501 is driven by the operating mechanism 3 to adjust the angle so that the guide rail 701 is directed toward the coal pillar for construction; the ground-supporting cylinder on the crawler chassis 1 is controlled by the operating mechanism 3 to support the ground and the vertical support part 601a of the column assembly 601 is controlled to extend upward to support the top of the coal wall, thereby completing the upper and lower support of the equipment; the angle adjustment cylinder 702b of the angle adjustment assembly 702 is driven by the operating mechanism 3 to adjust the inclination angle of the guide rail 701 so that the guide rail 701 reaches the construction angle; the translation cylinder 703 is driven by the operating mechanism 3 to move the guide rail 701 forward until the front support assembly 602 at the front end of the guide rail 701 can be supported on the coal pillar, and then the guide rail 701 is driven by the operating mechanism 3. The telescopic oil cylinder inside makes the rear support plate of the rear support assembly 603 extend backward and support it on the coal wall, thereby realizing the front and rear support of the guide rail 701; after the guide rail support is completed, the drilling tool is driven to rotate through the drilling rotary device 8, and at the same time, the drilling rotary device 8 is driven to move forward along the guide rail by the propulsion oil cylinder inside the guide rail 701 to realize the drilling of the drilling tool; after the equipment realizes the drilling through through the drilling tool, the back-expansion drill bit is installed on the other side of the coal pillar, and the drill bit can be back-expansion, and at this time, the propulsion oil cylinder in the guide rail 701 can be used to pull out the drilling rotary device 8 to realize the back-expansion drilling of the equipment; the drilling rotary device 8 uses a low-speed and high-torque motor 801 to directly drive the rotation of the drilling tool through the power adapter 802, which ensures the low-speed stability of the equipment during back-expansion drilling and improves the efficiency of the equipment operation.

Claims

1. A high-torque drilling rig for coal mines, comprising a chassis, a large disc rotating mechanism, a steady drill support assembly and a guide rail assembly, wherein the rotating large disc in the large disc rotating mechanism is rotatably arranged on the chassis, the steady drill support assembly and the guide rail assembly are both arranged on the rotating large disc, and a low-speed high-torque motor for driving the drill tool to rotate is installed on the guide rail assembly; characterized in that: The stable drilling support assembly includes a column assembly capable of providing upper support for the drilling rig, a front support assembly capable of providing front support for the drilling rig, and a rear support assembly capable of providing rear support for the drilling rig; the guide rail assembly includes a guide rail and a linear drive mechanism for realizing forward and backward movement of the guide rail; the output shaft of the low-speed high-torque motor is connected to the drill rod in the drilling tool through a drill rod connection assembly, and the drill rod connection assembly is used to realize the transmission of torque and push-pull force to the drill rod; A power adapter is provided between the drill rod connection assembly and the output shaft of the low-speed high-torque motor, the power adapter comprising a fixed housing, a rotating shaft and a bearing, the fixed housing is fixedly connected to the body of the low-speed high-torque motor, the rotating shaft is rotatably mounted inside the fixed housing through a bearing, one end of the rotating shaft is connected to the output shaft of the low-speed high-torque motor to transmit torque, and the other end of the rotating shaft is connected to the drill rod through the drill rod connection assembly; The drill rod connection assembly includes a pull-transmitting disc, a connecting shaft and a pressure cover, wherein the pull-transmitting disc is sleeved on the rotating shaft and fixedly connected to the rotating shaft; the pressure cover is sleeved on the connecting shaft and connected to the pull-transmitting disc, thereby pressing the connecting shaft against the end face of the rotating shaft; the connecting shaft and the rotating shaft are connected through a torque transmission structure, the drill rod is installed on the connecting shaft, and the torque is transmitted from the rotating shaft to the drill rod through the torque transmission structure; The column assembly is provided with two groups, and the column assembly includes an outer column and an internal oil cylinder arranged in the outer column, and the internal oil cylinder pushes the vertical support part to extend and retract up and down to realize the upper support of the drilling rig; An angle adjustment component is also provided between the column component and the guide rail component to adjust the pitch angle of the guide rail; The angle adjustment assembly includes an angle adjustment power mechanism and an angle adjustment bracket. One end of the angle adjustment bracket is hinged on the column assembly, and the other end is connected to the angle adjustment power mechanism. The guide rail is installed on the track surface of the angle adjustment bracket. Under the push of the linear drive mechanism, the guide rail can move back and forth along the track surface, and the pitch angle adjustment of the guide rail is achieved under the telescopic action of the angle adjustment power mechanism.

2. A high torque drill for coal mines according to claim 1, characterized in that: The end of the connecting shaft is provided with a radial boss, and the gland can be clamped on the radial boss.

3. A high torque drill for coal mines according to claim 1, characterized in that: The end surface of the pull-transfer disc is provided with circumferentially distributed threaded holes, and the end surface of the pressure cover is provided with circumferentially distributed circular holes. Bolts are passed through the circular holes and the threaded holes to connect the pressure cover and the pull-transfer disc, thereby realizing the connection.

4. A high torque drill for coal mines according to claim 1, characterized in that: The connecting shaft is positioned by a stopper structure between the rotating shaft and the connecting shaft; or the rotating shaft and the pressure cover are positioned by a stopper structure, and the pressure cover and the connecting shaft are positioned by a stopper structure.

5. A high torque drill for coal mines according to claim 1, characterized in that: The chassis is a crawler chassis, including a crawler walking mechanism and a ground-supporting oil cylinder. The crawler chassis is also provided with a power system, an operating mechanism and a hydraulic oil tank.

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