Power head of drilling machine

Abstract

The utility model relates to the field of coal mine drilling, and discloses a drilling machine power head which comprises a main shaft, a brake assembly, a gearbox and a main power source, an output shaft of the main power source is meshed with the gearbox to drive the main shaft to rotate, the gearbox comprises a gear shaft and a multi-stage gear, and a transmission shaft connected with the gear shaft is arranged in the brake assembly. A driving drill rod is installed at the end of the main shaft, a containing hole allowing the driving drill rod to penetrate through is formed in the main shaft, and the end of the driving drill rod is further detachably connected with a two-way connector. According to the drilling machine power head, the service life of the driving drill rod is long, and the driving drill rod can be taken out conveniently.

Description

Technical Field

[0001] The utility model relates to the field of coal mine drilling rigs, in particular to a drilling rig power head. Background Art

[0002] The power head is used to transmit the rotation and propulsion power required for assembly and disassembly to the drill rod. Most existing automatic drilling rigs use active drill rods to connect the power head and the drill rod. The emergence of automated directional drilling rigs integrates the needs of two drill rod connection methods: the chuck and the active drill rod: during normal automatic drilling, the active drill rod is used to load and unload ordinary drill rods from the front end of the power head; when using salvage drilling tools, the active drill rod is removed and the salvage drill rod is loaded and unloaded from the rear end of the power head using the chuck. The outer diameters of ordinary drill rods and salvage drill rods used in normal drilling are generally different, and the active drill rod often needs to be disassembled.

[0003] The existing technology is not good at disassembling and assembling quickly. When the active drill rod needs to be disassembled and switched to the chuck clamping working condition, the water braid must be removed from the rear end first, and then the end cover that fixes the active drill rod must be removed from the front end. Finally, the combination of the active drill rod and the connecting shaft must be pulled out from the front end of the chuck before the chuck can be used to clamp the drill rod for construction. Since the space from the front end of the chuck to the clamp is very limited and is generally located in the middle of the drilling rig, it is inconvenient to pull out the active drill rod and the connecting shaft, which can easily affect the construction efficiency. If the connecting shaft is removed separately from the rear end, since it is located inside the main shaft of the power head, it is not convenient to use larger manual tools such as pipe clamps, and disassembly is time-consuming. It may also require the removal of more peripheral parts. Similarly, when switching from the chuck clamping condition to the active drill rod connection condition, the installation is also time-consuming. In addition, the active drill rod is a wearing part and is consumed in large quantities during the use of the drilling rig. Its service life directly affects the overall drilling efficiency and the maintenance cost of the drilling rig. It is a key part that drilling rig users pay close attention to. Therefore, it is necessary to provide a drilling rig power head with a long service life of the active drill rod and easy removal of the active drill rod. Utility Model Content

[0004] The utility model aims to provide a drilling rig power head, so as to provide a drilling rig power head with a long service life of an active drill rod and convenient removal of the active drill rod.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a drilling rig power head, including a main shaft, a brake assembly, a gearbox and a main power source, the output shaft of the main power source is meshed with the gearbox to drive the main shaft to rotate, the gearbox includes a gear shaft and a multi-stage gear, a transmission shaft connected to the gear shaft is provided inside the brake assembly, the brake assembly performs rotational braking on the transmission shaft, an active drill rod is installed at the end of the main shaft, a receiving hole for the active drill rod to pass through is opened in the main shaft, and the end of the active drill rod is also detachably connected with a two-way joint.

[0006] The beneficial effects of this program are:

[0007] When the active drill rod needs to be inspected and replaced, since there is a accommodating hole in the main shaft for the active drill rod to pass through, the staff can directly slide the active drill rod in the accommodating hole and take it out from the rear of the main shaft, thereby increasing the speed of disassembly of the active drill rod. At the same time, the space at the rear end of the main shaft is relatively ample. If the active drill rod is taken out from the front of the main shaft according to the traditional method, on the one hand, the flange plate must be disassembled and tightened, and on the other hand, the space in the front is relatively limited, and it is inconvenient to install and disassemble the active drill rod. The above-mentioned arrangement can facilitate the staff to assemble the active drill rod and then reinstall it into the main shaft, thereby increasing the installation speed of the active drill rod. By setting the brake assembly, the start and stop of the active drill rod can be adjusted in time.

[0008] In the technical solution, the end of the active drill rod is also detachably connected with a two-way joint. When the thread on one side of the two-way joint is worn to a certain extent, the two-way joint can be removed and the installation direction can be reversed. The end of the two-way joint is fixedly connected to the active drill rod by glue, so that the service life of the active drill rod is equivalent to twice that of the previous integral active drill rod, and there is no need to replace the rod body, which can save a lot of installation time and use costs, and can play an emergency role when constructing in some places where it is inconvenient to repair and replace the active drill rod.

[0009] Preferably, as an improvement, the brake assembly includes a brake cover, a clamping piston and a releasing piston, a sliding shaft is provided inside the brake cover, one end of the transmission shaft extends into the center of the clamping piston, a plurality of cava are distributed circumferentially of the transmission shaft, the clamping piston is sleeved on the cava and can move axially, the surface of the cava away from the transmission shaft is an inclined surface, the surface of the clamping piston opposite to the cava is a slope surface matching the inclined surface of the cava, the clamping piston can slide through the cava to clamp the transmission shaft, the releasing piston is slidingly sleeved on the sliding shaft and can push the clamping piston to release the clamping.

[0010] The beneficial effects are as follows: the surface of the clamping piston opposite to the slip is a slope surface that matches the slope surface of the slip, and the clamping piston can slide so that the slope surface inside it contacts the slope surface of the slip, and the transmission shaft is clamped by radial movement of the slip, thereby limiting the rotation of the transmission shaft. The transmission shaft can be quickly clamped and released by the axial sliding of the clamping piston and the radial movement of the slip, and the cooperation between the slope surface and the slope surface provides a stable clamping force, ensuring that the transmission shaft will not slide during operation, ensuring the reliability of the clamping of the transmission shaft, and being adaptable to transmission shafts of different diameters. Even if the surface of the transmission shaft is worn, stable clamping can be achieved by extending the sliding distance of the clamping piston. It has strong versatility and can be applied to various types of drilling rig power heads.

[0011] Preferably, as an improvement, it also includes a water braid part for providing pressure fluid to the active drill rod, the water braid part includes a connecting shaft, a core shaft and a water inlet assembly, the core shaft and the connecting shaft are both hollow shafts, the core shaft is fixedly connected and communicated with the connecting shaft, the other end of the connecting shaft is connected to the active drill rod, the core shaft is communicated and rotatably connected with the water inlet assembly, a bearing seat is provided to support the core shaft, and a core shaft support bearing is provided in the bearing seat and is sleeved on the outer periphery of the core shaft.

[0012] The beneficial effects are as follows: by setting a connecting shaft and a water braid, the core shaft is fixedly connected and communicated with the connecting shaft, and the other end of the connecting shaft is connected to the active drill rod, so that the drilling medium flowing into the water braid is transmitted to the active drill rod, and the active drill rod and the water braid are connected. In this technical solution, the core shaft is connected to the active drill rod and rotates together with the active drill rod during operation. The core shaft support bearing can ensure smooth rotation of the core shaft, reduce friction and wear during the rotation process, and extend the service life of the equipment. Through the hollow design of the connecting shaft and the core shaft, the pressure fluid can be smoothly transmitted from the water inlet assembly to the active drill rod, ensuring that the drilling medium can be stably and continuously supplied, thereby improving the drilling efficiency.

[0013] Preferably, as an improvement, one end of the active drill rod is a male joint and the other end is a female joint, the male joint and the two-way joint are detachably connected, a stopper is provided on the outer periphery of the active drill rod, the outer periphery cross-section of the stopper is polygonal, an end cover is provided on the end of the main shaft, the end cover includes a front end cover and a chuck, the front end cover is fixed on the chuck, a limiting opening is opened on the front end cover, and the front end cover limits the rotation of the stopper through the limiting opening.

[0014] The beneficial effects are as follows: when the main shaft drives the end cover to stop rotating, the limit opening of the front end cover stops rotating synchronously, and the limit opening limits the rotation of the stop part, so that the active drill rod can stop rotating. The above method realizes the limitation of the rotation of the active drill rod, but does not limit the axial sliding of the active drill rod, so that the active drill rod can float axially for a certain distance during operation, which can effectively alleviate the axial impact of the drill rod during the threaded connection and disassembly process, thereby protecting the active drill rod and other connecting parts and extending the service life of the equipment; when the active drill rod produces axial floating, it can reduce the impact force on the water braid part, reduce the wear of the water braid part, and improve its overall durability and reliability.

[0015] Preferably, as an improvement, a limiting section is provided between the female joint and the stop block, the limiting section is located between the chucks, and when the chucks are clamped to the limit position, there is still a gap between the chucks and the outer periphery of the limiting section.

[0016] The beneficial effects are as follows: when the chuck moves to the extreme position, there is still a gap between the chuck and the outer periphery of the limit section, so that the limit section can slide axially along the chuck, and the active drill rod can float axially for a certain distance, so that the clamping force of the chuck will not directly act on the active drill rod, thereby avoiding the active drill rod directly bearing the strong clamping force of the chuck, and avoiding the metal fatigue deformation of the active drill rod during the reciprocating rotation process, thereby reducing fatigue damage and increasing the service life of the active drill rod; due to the axial floating design of the active drill rod, the impact force borne by the water braid during operation is reduced, which makes the force on the water braid more uniform.

[0017] Preferably, as an improvement, the brake cover is provided with oil inlet one and oil inlet two, and a first oil chamber is formed between the side of the release piston away from the clamping piston and the brake cover, and the oil inlet one can provide hydraulic oil to the first oil chamber, and a second oil chamber is provided on the side of the clamping piston away from the release piston, and the oil inlet two can provide hydraulic oil to the second oil chamber.

[0018] The beneficial effects are as follows: the pressure oil enters the second oil chamber from the oil inlet port 2, pushing the clamping piston to move toward the direction close to the slip, so that the internal slope surface contacts the inclined surface of the slip, thereby pushing the slip to move inward and limiting the radial displacement of the slip, thereby clamping the transmission shaft and achieving transmission shaft braking; the pressure oil enters the first oil chamber from the oil inlet port 1, pushing the release piston to move, and its end surface pushes the clamping piston to move away from the slip, releasing the radial displacement restriction on the slip, and thus releasing the rotation restriction on the transmission shaft. The automatic control of the brake assembly is achieved through the hydraulic system, which improves the automation level and efficiency of the operation. The hydraulic pressure can provide stable and adjustable pressure to ensure the accuracy of the clamping and releasing processes, and the hydraulic pressure has high stability and reliability, ensuring that the brake assembly can work stably under various working conditions, reducing the failure rate and maintenance costs.

[0019] Preferably, as an improvement, the length of the limiting section is greater than the width of the chuck.

[0020] The beneficial effect is that the length of the limit section is greater than the clamping width of the chuck, so that the active drill rod has a certain floating distance in the chuck, so as to alleviate the axial impact generated when the active drill rod is connected or disconnected with the drill rod, thereby protecting the active drill rod.

[0021] Preferably, as an improvement, the end cover includes an integrated flange and a sleeve, and the front end cover is fixedly connected to the chuck thread through the flange.

[0022] Preferably, as an improvement, a water inlet hole is opened at the end of the core shaft, and the water inlet assembly includes a shell, a water supply chamber connected to the water inlet hole is provided in the shell, the water supply chamber is connected to the water inlet hole, and an external thread for threaded connection with the rear end of the active drill rod is provided at a section of the connecting shaft close to the active drill rod; an internal thread for threaded connection with the core shaft is provided at one end of the connecting shaft close to the water braid portion.

[0023] The beneficial effects are: through the hollow setting of the connecting shaft and the core shaft, smooth transmission of pressure fluid is achieved, stable supply of drilling medium is ensured, and drilling efficiency is improved. The internal and external threads of the connecting shaft are matched to achieve a stable connection with the active drill rod and the core shaft, ensuring the stability and reliability of fluid transmission.

[0024] Preferably, as an improvement, the cross-section of the outer contour of the anti-rotation portion is a regular hexagon, and the limiting opening is a hexagonal inner hole that matches the anti-rotation portion.

[0025] The beneficial effects of the technical solution are as follows: in a directional drilling rig power head disclosed in the existing patent (publication number: CN116905958A), when it is necessary to replace the active drill rod, the staff needs to first remove the front end cover and then unlock the active drill rod. Since one end of the connecting shaft is threadedly connected to the active drill rod, and the other end is threadedly connected to the core shaft of the water braid, when the staff rotates the active drill rod to unlock it, the active drill rod and the connecting shaft cannot be accurately unlocked, and it is possible that the connecting shaft and the core shaft of the water braid are unlocked. Since the space from the front end of the chuck to the clamp is very limited, in the narrow operating space, even if the active drill rod is taken out alone, it will bring difficulty to the staff's operation. If the connecting shaft and the core shaft of the water braid are unlocked, the staff It becomes very difficult for the workers to take out the active drill rod and the connecting shaft from the front end. At the same time, if it is necessary to switch to the chuck to clamp the salvage drill rod for work, the workers need to remove the water braid from the rear end of the gearbox, take out the water braid and the connecting shaft from the rear end of the gearbox, and then remove the end cover to take out the active drill rod. In this process, it cannot be ensured that the connecting shaft is unlocked from the active drill rod. If the connecting shaft is unlocked from the core shaft of the water braid, the workers also need to take out the active drill rod and the connecting shaft from the front end of the gearbox together before they can load the salvage drill rod into the chuck and switch to the chuck to clamp the drill rod for work. Therefore, the existing technology is very difficult to replace the active drill rod or switch the chuck to clamp the salvage drill rod for work, which seriously affects the construction efficiency.

[0026] In this solution, when the active drill rod needs to be replaced, due to the wide operating space at the rear end of the gearbox, the staff only needs to loosen the chuck first, and then take out the water braid part, the connecting shaft and the active drill rod connection as a whole from the rear end of the gearbox, so as to quickly replace the damaged active drill rod, and then install the new active drill rod, the connecting shaft and the water braid connection as a whole into the gearbox from the rear end of the gearbox, and make the active drill rod pass through the main shaft, the chuck and the front end cover in sequence, so as to quickly complete the replacement of the active drill rod, reduce the uncontrollable factors in the replacement process, and increase the construction efficiency. When it is necessary to switch to the salvage drill rod work, the staff repeats the above disassembly process. During installation, it is only necessary to install the salvage drill rod from the rear end of the gearbox into the main shaft, and pass through the chuck and the front end cover in sequence, and finally clamp the salvage drill rod through the chuck to rotate. At the same time, a part of the active drill rod of the technical solution is located in the chuck and the main shaft, so that when the main shaft drives the active drill rod to rotate through the chuck, the rotation of the active drill rod is more stable and can be more accurately docked with the drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A cross-sectional view of an embodiment of the utility model;

[0028] Figure 2 A detailed view of a brake assembly according to an embodiment of the utility model;

[0029] Figure 3 This is a detailed view of the active drill rod of the embodiment of the utility model;

[0030] Figure 4 This is a detailed view of the water braid part of the embodiment of the utility model;

[0031] Figure 5 This is a schematic diagram of the connection of the water braid part of the embodiment of the utility model;

[0032] Figure 6 It is a right side view of the connecting sleeve of the embodiment of the utility model;

[0033] Figure 7 This is a schematic diagram of gluing a bidirectional joint according to the present invention. DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods:

[0035] The figure marks in the drawings of the specification include: main power source 1, active drill rod 11, male joint 111, female joint 112, anti-rotation part 113, limit section 114, main shaft 12, accommodating hole 121, front end cover 123, chuck 124, two-way joint 13, gearbox 2, brake assembly 3, brake cover 31, clamping piston 32, loosening piston 33, sliding shaft 34, slip 35, transmission shaft 36, oil inlet 1 37, oil inlet 2 38, key 39, water braid 4, connecting shaft 41, core shaft 42, water inlet assembly 43, shell 431, water supply chamber 432, water inlet hole 433, bearing seat 44, core shaft support bearing 45, connecting sleeve 46, waist-shaped hole 461, grease nipple 462.

[0036] Example

[0037] The embodiment is basically as follows Figure 1-Figure 6 As shown, Figure 1 The drilling rig power head shown includes a main shaft 12, a brake assembly 3, a gearbox 2 and a main power source 1. The output shaft of the main power source 1 is engaged with the gear in the gearbox 2 to drive the main shaft 12 to rotate. The main power source 1 can be various rotary power drive devices, such as: hydraulic motor, electric motor, etc. The main power source 1 of the present application is a hydraulic motor. The gearbox 2 includes a gear shaft and a multi-stage gear. A transmission shaft 36 connected to the gear shaft is provided inside the brake assembly 3. The transmission shaft 36 is connected to the gear shaft through a key 39 and rotates synchronously. The brake assembly 3 performs rotational braking on the transmission shaft 36. An active drill rod 11 is installed at the end of the main shaft 12. A receiving hole 121 is opened in the main shaft 12 for the active drill rod 11 to pass through. The end of the active drill rod 11 is also detachably connected with a two-way joint 13.

[0038] like Figure 2As shown, the brake assembly 3 includes a brake cover 31, a clamping piston 32 and a release piston 33. A sliding shaft 34 is provided on the brake cover 31. The left end of the transmission shaft 36 extends into the center of the clamping piston 32. A plurality of slips 35 are distributed circumferentially of the transmission shaft 36. In this embodiment, the number of slips 35 is 3. The clamping piston 32 is sleeved on the outside of the slips 35 and can move axially along the transmission shaft 36. The surface of the slips 35 away from the transmission shaft 36 is an inclined surface. The surface of the clamping piston 32 opposite to the slips 35 is an inclined surface. 5, the clamping piston 32 can slide by pushing the slip 35 to radially slide and clamp the transmission shaft 36, the releasing piston 33 is slidably sleeved on the sliding shaft 34 and can push the clamping piston 32 to release the clamping, the surface of the clamping piston 32 opposite to the slip 35 is a slope surface that matches the slope of the slip 35, the clamping piston 32 can slide so that the slope inside it contacts the slope of the slip 35, and the transmission shaft 36 is clamped by the radial movement of the slip 35, thereby limiting the rotation of the transmission shaft 36. The transmission shaft 36 can be quickly clamped and released through the axial sliding of the clamping piston 32 and the radial movement of the cava 35. The cooperation between the inclined surface and the slope surface provides a stable clamping force, ensuring that the transmission shaft 36 does not slide during operation, ensuring the reliability of the clamping of the transmission shaft 36, and being adaptable to transmission shafts 36 of different diameters. Even if the surface of the transmission shaft 36 is worn, stable clamping can be achieved by extending the sliding distance of the clamping piston 32. The transmission shaft 36 has strong versatility and can be applied to various types of drilling rig power heads.

[0039] The brake cover 31 is provided with an oil inlet 1 37 and an oil inlet 2 38. A first oil chamber is formed between the brake cover 31 and the side of the release piston 33 away from the clamping piston 32. The oil inlet 1 37 can provide hydraulic oil to the first oil chamber. The side of the clamping piston 32 away from the release piston 33 is provided with a second oil chamber. The oil inlet 2 38 can provide hydraulic oil to the second oil chamber. The inner wall and the outer wall of the release piston 33 are both provided with sealing rings. The outer wall sleeve of the clamping piston 32 is also provided with a sealing ring. The setting of the sealing ring effectively prevents leakage of hydraulic oil and ensures that the pressure in the hydraulic structure remains stable. The pressure oil enters the second oil chamber from the oil inlet 38, pushing the clamping piston 32 to move to the left, so that the slope inside it contacts the inclined surface of the cava 35, thereby pushing the cava 35 to move inward and limiting the radial displacement of the cava 35, thereby clamping the drive shaft 36 to achieve braking of the drive shaft 36; the pressure oil enters the first oil chamber from the oil inlet 37, pushing the release piston 33 to move, and its end face pushes the clamping piston 32 to move to the right, releasing the radial displacement restriction of the cava 35, thereby releasing the rotation restriction of the drive shaft 36, and realizing automatic control of the brake assembly 3 through hydraulic pressure, thereby improving the automation level and efficiency of the operation, and the hydraulic pressure can provide stable and adjustable pressure to ensure the accuracy of the clamping and releasing process, and the hydraulic pressure has high stability and reliability, ensuring that the brake assembly 3 can work stably under various working conditions, reducing the failure rate and maintenance cost.

[0040] It also includes a water braid 4 that provides pressure fluid to the active drill pipe 11, such as Figure 4 and Figure 5 As shown, the water braid part 4 includes a connecting shaft 41, a core shaft 42 and a water inlet assembly 43. The core shaft 42 and the connecting shaft 41 are both hollow shafts. The core shaft 42 is fixedly connected and communicated with the connecting shaft 41. The other end of the connecting shaft 41 is connected to the active drill rod 11. The core shaft 42 is communicated and rotatably connected with the water inlet assembly 43. A bearing seat 44 is provided to support the core shaft 42. A core shaft support bearing 45 is provided in the bearing seat 44 and is sleeved on the outer periphery of the core shaft 42. The core shaft 42 is fixedly connected and communicated with the connecting shaft 41. The other end of the connecting shaft 41 is connected to the active drill rod 11. The core shaft 42 is communicated and rotatably connected with the water inlet assembly 43. The water inlet assembly 43 includes a housing 431, a water supply chamber 432 connected to the water inlet hole 433 is provided in the housing 431, and the water supply chamber 432 is connected to the water inlet hole 433. The connecting shaft 41 is provided with an external thread for threaded connection with the rear end of the active drill rod 11 near the active drill rod 11; the connecting shaft 41 is provided with an internal thread for threaded connection with the core shaft 42 near the water braid 4, and the drilling medium flowing into the water braid 4 is transferred to the active drill rod 11, and the active drill rod 11 and the water braid 4 are connected. In this technical solution, the core shaft 42 is connected to the active drill rod 11 and rotates with the active drill rod 11 during operation. The core shaft support bearing 45 can ensure the smooth rotation of the core shaft 42, reduce the friction and wear during the rotation process, and extend the service life of the equipment. Through the hollow design of the connecting shaft 41 and the core shaft 42, the pressure fluid can be smoothly transmitted from the water inlet assembly 43 to the active drill rod 11, ensuring that the drilling medium can be stably and continuously supplied, and improving the drilling efficiency. The bearing seat 44 is provided with a grease nipple 462, which is connected to the inside of the bearing seat 44. The grease nipple 462 can provide lubricating oil to the spindle support bearing 45 to keep the spindle support bearing 45 lubricated, reduce the friction of the bearing under high load conditions, and extend the service life of the bearing; effective lubrication reduces the wear and heat accumulation of the bearing, avoids bearing damage caused by overheating, and improves the reliability and durability of the equipment. The water braid 4 is fixed to the gearbox 2 through the connecting sleeve 46, such as Figure 6 As shown, the connecting sleeve 46 includes a connecting flange, and waist-shaped holes 461 for bolts to pass through are opened on the upper and lower sides of the connecting flange to ensure the stability of the connection. A hexagonal hole is opened in the center of the connecting sleeve 46, and the right end of the core shaft 42 is a regular hexagon that matches the hexagonal hole and is axially slidably connected to the hexagonal hole. When in use, the end of the core shaft 42 is inserted into the hexagonal hole so that the connecting sleeve 46 can drive the core shaft to rotate when it rotates with the main shaft 12, and the connecting flange is fixedly connected to the main shaft 12 with threads.

[0041] like Figure 3As shown, one end of the active drill rod 11 is a male connector 111, and the other end is a female connector 112. The male connector 111 is detachably connected to the bidirectional connector 13. A rotation-stopping portion 113 is provided on the outer periphery of the active drill rod 11. The outer periphery cross-section of the rotation-stopping portion 113 is polygonal. An end cover portion is provided on the end of the main shaft 12. The end cover portion includes a front end cover 123 and a chuck 124. The front end cover 123 is fixed on the chuck 124. A limiting opening is provided on the front end cover 123. The front end cover 123 limits the rotation of the rotation-stopping portion 113 through the limiting opening. When the main shaft 12 drives the end cover portion to stop rotating, the limiting opening of the front end cover 123 stops rotating synchronously. The limiting opening The hole limits the rotation of the stop portion 113, thereby allowing the active drill rod 11 to stop rotating. The above method realizes the limitation of the rotation of the active drill rod 11, but does not limit the axial sliding of the active drill rod 11, so that the active drill rod 11 can float axially for a certain distance during operation, which can effectively alleviate the axial impact generated by the drill rod during the threaded connection and disassembly process, thereby protecting the active drill rod 11 and other connecting parts and extending the service life of the equipment; when the active drill rod 11 produces axial floating, it can reduce the impact force on the water braid 4, reduce the wear of the water braid 4, and improve its overall durability and reliability. A limiting section 114 is provided between the female joint 112 and the stop block, and the limiting section 114 is located between the chuck 124. When the chuck 124 is clamped to the limit position, there is still a gap between the chuck 124 and the outer periphery of the limiting section 114. When the chuck 124 moves to the limit position, there is still a gap between the chuck 124 and the outer periphery of the limiting section 114. The length of the limiting section 114 is greater than the width of the chuck 124, so that the clamping force of the chuck 124 will not directly act on the active drill rod 11, thereby avoiding the active drill rod 11 directly bearing the strong clamping force of the chuck 124, and avoiding the metal fatigue deformation of the active drill rod 11 during the reciprocating rotation process, thereby reducing fatigue damage and increasing the service life of the active drill rod 11; due to the axial floating design of the active drill rod 11, the impact force borne by the water braid part 4 during the working process is reduced, which makes the water braid part 4 more evenly stressed, and the front end cover 123 includes an integrated flange and a jacket, and the front end cover 123 is threadedly fixedly connected to the chuck 124 through the flange to ensure the stability of the fixation. A gap M is left between the inner end face of the connecting sleeve 46 facing the active drill rod 11 and the end face of the connecting shaft 41, so that the limiting section 114 can slide axially along the chuck 124, so that the active drill rod 11 can float axially for a certain distance. The hollow setting of the connecting shaft 41 and the mandrel 42 realizes the smooth transmission of the pressure fluid, ensures the stable supply of the drilling medium, and improves the drilling efficiency. The internal and external threads of the connecting shaft 41 cooperate to realize the stable connection with the active drill rod 11 and the mandrel 42. The bearing seat 44 and the housing 431 are fixedly connected by bolts, and sealing rings are provided between the mandrel 42 and the housing 431 on both sides of the water inlet hole 433 to realize the sealing of the drilling medium.

[0042] The use of the drilling rig power head is as follows:

[0043] When the active drill rod 11 needs to be inspected and replaced, since the main shaft 12 is provided with a receiving hole 121 for the active drill rod 11 to pass through, the staff can directly slide the active drill rod 11 in the receiving hole 121 and take it out from the rear of the main shaft 12, thereby improving the speed of disassembling the active drill rod 11. At the same time, the space at the rear end of the main shaft 12 is relatively ample. If the active drill rod 11 is taken out from the front of the main shaft 12 according to the traditional method, on the one hand, the flange plate needs to be disassembled and tightened, and on the other hand, the space in the front is relatively limited, and it is inconvenient to install and disassemble the active drill rod 11. The above-mentioned arrangement can facilitate the staff to assemble the active drill rod 11 and then reinstall it into the main shaft 12, thereby improving the installation speed of the active drill rod 11. By setting the brake assembly 3, the start and stop of the active drill rod 11 can be adjusted in time.

[0044] In the technical solution, the end of the active drill rod 11 is also detachably connected to a two-way joint 13 by glue. When the thread on one side of the two-way joint 13 is worn to a certain extent, the two-way joint 13 can be removed and the installation direction can be reversed, and the end of the two-way joint 13 is fixedly connected to the active drill rod 11 by glue. Specifically: Figure 7 As shown, a fastening glue is applied to the upper side of the two-way joint 13 along an axial straight line, and then the glue is applied symmetrically below the side joint. When the side joint is screwed with the female joint 112, the fastening glue at the left end of the glue-applied end will contact the thread of the female joint 112, and the fastening glue will be applied more widely along the tightening direction. The further to the right, the fewer the number of contacts between the fastening glue and the thread of the female joint 112, and the smaller the spread of the application. When the glue-applied side is screwed into the female joint 112 of the rod body, the fastening glue previously applied in a straight line will be spread out, forming a projection on the central symmetric plane of the joint. It is an approximately trapezoidal tape that is wider on the left and narrower on the right. When the other side is replaced, a similar method is used to apply glue, which just complements the strength of the thread itself, and better equalizes the strength of the threaded connection, which not only ensures the reversal anti-loosening strength, but also facilitates later disassembly, so that the service life of the active drill rod 11 is equivalent to twice that of the previous integral active drill rod 11, and there is no need to replace the rod body, which can save a lot of installation time and use costs, and can play an emergency role when constructing in some remote places where it is not convenient to repair and replace the active drill rod 11.

[0045] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A drilling rig power head, including a main shaft, a brake assembly, a gearbox and a main power source, wherein the output shaft of the main power source is engaged with the gearbox to drive the main shaft to rotate, and the characteristics are: The gearbox includes a gear shaft and multi-stage gears. A transmission shaft connected to the gear shaft is provided inside the brake assembly. The brake assembly performs rotational braking on the transmission shaft. An active drill rod is installed at the end of the main shaft. An accommodating hole for the active drill rod to pass through is opened in the main shaft. The end of the active drill rod is also detachably connected with a two-way joint.

2. The drilling rig power head according to claim 1, characterized in that: The brake assembly includes a brake cover, a clamping piston and a releasing piston. A sliding shaft is provided inside the brake cover. One end of the transmission shaft extends into the center of the clamping piston. There are multiple slips distributed circumferentially of the transmission shaft. The clamping piston is sleeved on the slips and can move axially along the sliding shaft. The surface of the slip away from the transmission shaft is an inclined surface. The surface of the clamping piston opposite to the slip is a slope surface matching the inclined surface of the slip. The clamping piston can slide through the slips to clamp the transmission shaft. The releasing piston is slidingly sleeved on the sliding shaft and can push the clamping piston to release the clamping.

3. The drilling rig power head according to claim 2, characterized in that: It also includes a water braid part that provides pressure fluid to the active drill pipe. The water braid part includes a connecting shaft, a core shaft and a water inlet assembly. The core shaft and the connecting shaft are both hollow shafts. The core shaft is fixedly connected and communicated with the connecting shaft. The other end of the connecting shaft is connected to the active drill pipe. The core shaft is communicated and rotatably connected with the water inlet assembly. A bearing seat is provided to support the core shaft. The bearing seat is provided with a core shaft support bearing sleeved on the outer periphery of the core shaft.

4. The drilling rig power head according to claim 3, characterized in that: One end of the active drill rod is a male joint, and the other end is a female joint. The male joint and the two-way joint are detachably connected. A stopper is provided on the outer periphery of the active drill rod. The outer periphery cross-section of the stopper is polygonal. An end cover is provided on the end of the main shaft. The end cover includes a front end cover and a chuck. The front end cover is fixed on the chuck. A limiting opening is opened on the front end cover. The front end cover limits the rotation of the stopper through the limiting opening.

5. The drilling rig power head according to claim 4, characterized in that: A limit section is provided between the female joint and the anti-rotation block, and the limit section is located between the chucks. When the chucks are clamped to the limit position, there is still a gap between the chucks and the outer periphery of the limit section.

6. The drilling rig power head according to claim 5, characterized in that: The brake cover is provided with oil inlet one and oil inlet two, and a first oil chamber is formed between the side of the release piston away from the clamping piston and the brake cover, and the oil inlet one can provide hydraulic oil to the first oil chamber, and a second oil chamber is provided on the side of the clamping piston away from the release piston, and the oil inlet two can provide hydraulic oil to the second oil chamber.

7. The drilling rig power head according to claim 6, characterized in that: The length of the limiting section is greater than the width of the chuck.

8. The drilling rig power head according to claim 7, characterized in that: The front end cover comprises an integrated flange and a jacket, and the front end cover is fixedly connected with the chuck thread through the flange.

9. The drilling rig power head according to claim 8, characterized in that: A water inlet hole is opened at the end of the core shaft, and the water inlet assembly includes a shell, in which a water supply chamber connected to the water inlet hole is arranged, and the water supply chamber is connected to the water inlet hole. An external thread for connecting to the threaded connection with the rear end of the active drill rod is arranged at a section of the connecting shaft close to the active drill rod; an internal thread for connecting to the threaded connection with the core shaft is arranged at one end of the connecting shaft close to the water braid part.

10. The drilling rig power head according to claim 9, characterized in that: The cross-section of the outer contour of the anti-rotation part is a regular hexagon, the limiting opening is a hexagonal inner hole that matches the anti-rotation part, the end of the core shaft is a regular hexagon that matches the hexagonal hole and is axially slidingly connected to the hexagonal hole, and the core shaft can be inserted into the hexagonal hole so that the connecting sleeve can drive the core shaft to rotate when it rotates with the main shaft.

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