Power head for vertical shaft core drill

Abstract

The utility model discloses a power head for a vertical shaft core drill, which adopts the combination of a planetary reducer and a power box to realize the power transmission of a hydraulic motor to a drill rod, the planetary reducer is not only high in transmission efficiency, lower in heat productivity and larger in transmission, can reduce the input of the power box to be less than one thousand revolutions, and is matched with the power box to change the speed through two shafts. The high drilling speed output required by normal drilling and the low rotating speed and high torque output required by accident working conditions can be met, the drilling speed of the input shaft and the output shaft in the power box is lower than that of an existing power head, heat productivity is small, grease lubrication can be adopted, the structure is compact, and the size is small. Therefore, the problems that an existing power head is large in size and high in heat productivity can be effectively solved, the drilling construction difficulty can be reduced, and the construction speed can be increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary drilling devices, and particularly relates to a power head for a vertical shaft core drill rig. Background Art

[0002] A vertical shaft core drill rig is a kind of core drilling equipment, which is mainly used for mineral exploration, engineering geological exploration, hydrogeological survey, oil and gas field exploration, water well drilling, etc. The vertical shaft core drill rig connects and drives the drill pipe through a power head. The power head mainly includes a hydraulic motor, a reduction box, a hollow main shaft, and a drill pipe loading and unloading structure. The hydraulic motor drives the hollow main shaft through the reduction box to increase the torque, and the hollow main shaft connects and drives the drill pipe to rotate through the drill pipe loading and unloading structure.

[0003] To enable the drill pipe to smoothly rotate and cut the soil and rock formations for drilling, the drill pipe needs to reach a certain torque and rotational speed, and the rotational speed generally needs to reach about one thousand revolutions per minute; most traditional power heads use three rotating shafts to form a two-stage reduction. For example, the hollow chuck type power head disclosed in Chinese Patent CN201753583U converts the high rotational speed output by the hydraulic motor into the required rotational speed and reaches the corresponding torque through two-stage reduction. Although it can meet the conventional use requirements, its volume and weight are relatively large, and it is more troublesome to move and use. In addition, since the rotational speeds of multiple rotating shafts in the power head are much higher than one thousand revolutions per minute, the heat generation is relatively high, and it is necessary to use liquid lubricating oil and be equipped with a lubricating circulation system for lubrication and heat dissipation. Moreover, only the hydraulic motor is used for speed regulation, and the speed regulation range is small, and the working condition adaptability is weak; there are also the large-torque dual-motor dual-speed rotary power head disclosed in Chinese Patent CN106223838A and a hydraulic power head for an engineering drill rig disclosed in Chinese Patent CN103132905A. This kind of power head realizes a wider range of speed regulation by switching the hydraulic motor to adapt to various working conditions. However, the transmission box structure corresponding to the dual hydraulic motors is relatively complex, and there are also problems of inconvenient movement and high heat generation.

[0004] Therefore, it is necessary to design a power head for a vertical shaft core drill rig with a compact structure and strong adaptability to reduce the difficulty of drilling construction and improve the construction speed. Summary of the Invention

[0005] Aiming at the above-mentioned deficiencies of the prior art, the purpose of the present utility model is to provide a power head for a vertical shaft core drill rig, solve the technical problems of the existing power head having a large volume and high heat generation, and achieve the effects of reducing the difficulty of drilling construction and improving the construction speed.

[0006] To solve the above technical problems, the present utility model adopts the following technical solutions:

[0007] A power head for a vertical shaft core drill, comprising a power box, in which a parallel input shaft and an output shaft are rotatably arranged. One end of the input shaft is drivingly connected to a hydraulic motor through a planetary reducer; in the power box, a low-speed driving gear and a high-speed driving gear are synchronously rotatably arranged on the input shaft, and a low-speed driven gear and a high-speed driven gear are arranged on the output shaft. The low-speed driven gear is rotatably connected to the output shaft. The low-speed driven gear has external teeth and internal teeth. The external teeth of the low-speed driven gear are meshed with the low-speed driving gear. The high-speed driven gear is synchronously rotatably connected to the output shaft and can slide axially. When the high-speed driven gear slides to cooperate with the internal teeth of the low-speed driven gear, a low rotational speed is output. When the high-speed driven gear slides to be meshed with the high-speed driving gear, a high rotational speed is output; the power head further comprises a speed-changing mechanism for driving the high-speed driven gear to slide.

[0008] Further, a circumferential control groove is formed in the middle part of the high-speed driven gear axially. The speed-changing driving mechanism comprises a driving source and a fork. The output end of the driving source is drivingly connected to the fork head. The fork is located in the power box and the fork foot is connected to the control groove. The driving source drives the high-speed driven gear to slide axially through the fork.

[0009] Further, the axial direction of the shaft hole on the fork head corresponds to the width direction of the fork foot. The fork head is synchronously rotatably connected with a driving shaft through the shaft hole. The driving shaft is rotatably connected in the power box. The driving shaft is perpendicular to the input shaft and is located between the input shaft and the output shaft. The driving source is drivingly connected to the fork head through the driving shaft and is used for driving the fork to swing; the inner side of the end of the fork foot is rotatably connected with a driving block through a rotating shaft. The axial direction of the rotating shaft corresponds to the width direction of the fork foot. The driving block is located in the control groove so that the high-speed driven gear slides as the fork swings.

[0010] Further, a swing arm is synchronously rotatably connected to the driving shaft. The swing arm extends radially in a direction opposite to the fork on the driving shaft. The driving source is a hydraulic cylinder arranged axially along the input shaft. A matching hole is radially penetrated through the telescopic rod of the hydraulic cylinder. The free end of the swing arm is located in the matching hole. Axially on the telescopic rod, the size of the matching hole is larger than the size of the free end of the swing arm, so that the hydraulic cylinder can drive the driving shaft to rotate through the swing arm and then make the fork swing.

[0011] Further, the housing of the planetary reducer is respectively connected to the power box and the hydraulic motor. The hydraulic cylinder is located outside the power box and is connected to the side opposite to the hydraulic motor.

[0012] Further, the planetary reducer is a first-stage planetary reducer. The output shaft of the hydraulic motor is synchronously rotatably connected to the sun gear of the planetary reducer. The input shaft is synchronously rotatably connected to the planet carrier of the planetary reducer.

[0013] Further, the output shaft is a joint-type output shaft.

[0014] Furthermore, the output shaft is a chuck-type output shaft.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] For the power head of the vertical shaft core drill of the utility model, a planetary reducer and a power box are combined to achieve the power transmission from the hydraulic motor to the drill pipe. The planetary reducer not only has high transmission efficiency, low heat generation, but also has a large transmission ratio, which can reduce the input of the power box to below 1000 revolutions per minute. Combined with the two-axis speed change of the power box, it can meet the relatively high drill speed output required for normal drilling and the low speed and high torque output required for accident conditions. The drill speeds of the input shaft and the output shaft in the power box are lower than those of the existing power heads, which not only generates less heat, can use grease lubrication, but also has a compact structure and a small volume. Therefore, the utility model can effectively solve the problems of the large volume and high heat generation of the existing power heads, which is beneficial to reducing the difficulty of drilling construction and improving the construction speed. Description of the Drawings

[0017] Figure 1 It is a three-dimensional view of the power head of the vertical shaft core drill for Embodiment 1;

[0018] Figure 2 It is a front view of the power head of the vertical shaft core drill for Embodiment 1;

[0019] Figure 3 For Figure 2 A schematic diagram with the power box and the sliding connection seat hidden;

[0020] Figure 4 For Figure 3 A schematic diagram of further components;

[0021] Figure 5 For Figure 4 An exploded schematic diagram obtained by moving some components in;

[0022] Figure 6 It is a three-dimensional view of the power head of the vertical shaft core drill for Embodiment 2;

[0023] Among them, the power box 1, the input shaft 2, the output shaft 3, the planetary reducer 4, the hydraulic motor 5, the drill pipe joint 6, the low-speed driving gear 7, the high-speed driving gear 8, the low-speed driven gear 9, the high-speed driven gear 10, the sliding connection seat 11, the sleeve 12, the control groove 13, the driving source 14, the fork 15, the driving shaft 16, the rotating shaft 17, the driving block 18, the swing arm 19, the hydraulic cylinder 20, the mating hole 21, the sun gear 22, the planetary gear 23, the planetary carrier 24, the internal gear ring 25, the drill pipe chuck 26. Detailed Embodiments

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0025] Embodiment 1: Please refer to Figure 1 、 Figure 2 and Figure 3 , a power head for a vertical-axis core drill, comprising a power box 1. Inside the power box 1, a parallel input shaft 2 and an output shaft 3 are rotatably provided. One end of the input shaft 2 extends out of the power box 1 and is drivingly connected to a hydraulic motor 5 through a planetary reducer 4. The hydraulic motor 5 drives the input shaft 2 to rotate through the planetary reducer 4. One end of the output shaft 3 extends out of the power box 1 for connecting a drill pipe. Inside the power box 1, a low-speed driving gear 7 and a high-speed driving gear 8 are synchronously rotated on the input shaft 2. A low-speed driven gear 9 and a high-speed driven gear 10 are provided on the output shaft 3. The low-speed driven gear 9 is rotatably connected to the output shaft 3. The low-speed driven gear 9 has external teeth and internal teeth. The external teeth of the low-speed driven gear 9 mesh with the low-speed driving gear 7. The high-speed driven gear 10 is synchronously rotatably connected to the output shaft 3 and can slide axially. The high-speed driven gear 10 can slide to cooperate with the internal teeth of the low-speed driven gear 9 or can slide to mesh with the high-speed driving gear 8. The power head further comprises a speed-changing mechanism for driving the high-speed driven gear 10 to slide.

[0026] In this embodiment, the housing of the planetary reducer 4 is respectively connected to the power box 1 and the hydraulic motor 5. The output shaft 3 adopts a joint-type output shaft. As Figure 1 shown, one end of the output shaft 3 extends out of the power box 1 and is connected to a drill pipe through a drill pipe joint 6. A sliding connection seat 11 is provided on one side of the power box 1 for cooperating with the feeding mechanism of the vertical-axis core drill to realize lifting. As Figure 3 shown, the diameter of the low-speed driving gear 7 is smaller than that of the low-speed driven gear 9. The diameter of the high-speed driving gear 8 is larger than that of the high-speed driven gear 10. The diameter of the high-speed driven gear 10 is adapted to the diameter at the internal teeth of the low-speed driven gear 9. The low-speed driven gear 9 is a gear ring with external teeth and internal teeth. The high-speed driven gear 10 can not only slide to mesh with the high-speed driving gear 8 to realize high-speed transmission, but also slide to the internal teeth of the low-speed driven gear 9 and mesh with it, so that the low-speed driven gear 9 is synchronously rotatably connected to the output shaft 3, thereby realizing low-speed transmission.

[0027] The power head for the vertical shaft core drill of the present utility model uses a planetary reducer 4 to reduce the rotational speed of the hydraulic motor 5 input into the power box 1. The planetary reducer 4 has a relatively large transmission ratio, which can reduce the output of several thousand revolutions of the hydraulic motor 5 to less than one thousand revolutions and transmit it to the input shaft 2, and then cooperate with the power box 1 to complete speed change. During normal operation, the high-speed driven gear 10 can be driven by the speed change mechanism to slide and mesh with the high-speed driving gear 8 to achieve high-speed transmission, so that the power box 1 outputs a rotational speed of about one thousand revolutions per minute to the drill pipe through the output shaft 3 to meet the requirements of normal drilling. When in-hole accidents such as sticking of the drill or detachment of blocks occur, the high-speed driven gear 10 can be driven by the speed change mechanism to slide and mesh with the internal teeth of the low-speed driven gear 9 to achieve low-speed transmission, so that the power box 1 outputs a rotational speed of several hundred revolutions per minute to the drill pipe through the output shaft 3, thereby increasing the torque to facilitate the handling of in-hole accidents.

[0028] For the power head for the vertical shaft core drill of the present utility model, since the transmission structure of the planetary reducer 4 is relatively evenly distributed and the reaction forces of its planetary gears 23 acting on the central gear and the arm bearings can balance each other, the transmission efficiency is higher and the heat generation is lower than that of ordinary reducers. In addition, the output shaft 3 and the input shaft 2 of the planetary reducer 4 are collinear, which can not only bear a greater load, but also has a more compact structure and a smaller volume than ordinary reducers. The power box 1 with two shafts mainly functions to change speed, not only has a smaller volume, but also has relatively low rotational speeds of the input shaft 2 and the output shaft 3, and less heat generation. The power head for the vertical shaft core drill uses the combination of the planetary reducer 4 and the power box 1 to achieve the power transmission from the hydraulic motor 5 to the drill pipe. It not only has a relatively compact overall structure and a small volume, but also has less heat generation, and can use grease lubrication, which can effectively solve the problems of the existing power head having a large volume and a high heat generation, and is beneficial to reducing the difficulty of drilling construction and improving the construction speed.

[0029] Please refer to Figure 4 and Figure 5 , Figure 4 In Figure 3On the basis of hiding the power box 1 and the sliding connection seat 11, components such as the hydraulic motor 5, the drill pipe joint 6, and the bearing are further hidden to more clearly show the transmission structure inside the power box 1; the input shaft 2 is synchronously rotationally connected to the low-speed driving gear 7 and the high-speed driving gear 8 through splines respectively, and a sleeve 12 is provided between the low-speed driving gear 7 and the high-speed driving gear 8 on the input shaft 2 to keep the distance between the two; a manipulation groove 13 is provided in a circle at the axial middle of the high-speed driven gear 10, and the speed change driving mechanism includes a driving source 14 and a fork 15. The output end of the driving source 14 is in transmission connection with the fork head, the fork 15 is located inside the power box 1 and the fork feet are connected to the manipulation groove 13, and the driving source 14 drives the high-speed driven gear 10 to axially slide through the fork 15; during implementation, the driving source 14 can adopt linear driving mechanisms such as cylinders, hydraulic cylinders, and electric push rods to drive the fork 15 to move circumferentially along the output shaft 3. The fork feet of the fork 15 are stuck in the manipulation groove 13, thereby pushing the high-speed driven gear 10 to axially slide on the output shaft 3.

[0030] In this embodiment, the axial direction of the shaft hole on the fork head is designed to correspond to the width direction of the fork feet. The fork head is synchronously rotationally connected with a driving shaft 16 through the shaft hole. The driving shaft 16 is rotationally connected inside the power box 1. The driving shaft 16 is perpendicular to the input shaft 2 and is located between the input shaft 2 and the output shaft 3. The driving source 14 is in transmission connection with the fork head through the driving shaft 16 and is used to drive the fork 15 to swing; the inner side of the end of the fork feet is rotationally connected with a driving block 18 through a rotating shaft 17. The axial direction of the rotating shaft 17 corresponds to the width direction of the fork feet. The driving block 18 is located in the manipulation groove 13 so that the high-speed driven gear 10 slides as the fork 15 swings; in this way, the driving block 18 axially moves by the swing of the fork feet. Compared with the overall axial movement of the conventional fork 15, the required axial space is smaller, enabling this solution to not only arrange the fork head and the driving shaft 16 on the side of the output shaft 3 close to the input shaft 2, but also arrange the fork head and the driving shaft 16 between the low-speed driving gear 7 and the high-speed driving gear 8, making the structure of the power box 1 more compact and conducive to reducing the volume of the power box 1; correspondingly, during implementation, the driving source 14 can adopt a rotary driving mechanism, such as a motor, which is horizontally arranged outside the power box 1 and is synchronously rotationally connected with the driving shaft 16, but this will cause an increase in the lateral dimension of the power head.

[0031] For this purpose, in this embodiment, a swing arm 19 is synchronously and rotationally connected to the drive shaft 16. The swing arm 19 extends in the radial direction of the drive shaft 16 towards the direction opposite to the fork 15. The drive source 14 is a hydraulic cylinder 20 axially arranged along the input shaft 2. A mating hole 21 is radially penetrated through the telescopic rod of the hydraulic cylinder 20. The free end of the swing arm 19 is located within the mating hole 21. In the axial direction of the telescopic rod, the size of the mating hole 21 is larger than the size of the free end of the swing arm 19, so that the hydraulic cylinder 20 can drive the drive shaft 16 to rotate through the swing arm 19 and then swing the fork 15; in this way, the drive source 14 is arranged on the vertical side of the power box 1, specifically outside the power box 1 and connected to the side opposite to the hydraulic motor 5, so that within the vertical dimension range of the drill pipe joint 6 outside the power box 1, the drive source 14 will not cause an increase in the size of the power head, which is beneficial to controlling the overall volume of the power head and reducing the transportation and use difficulties.

[0032] Please refer to Figure 4 and Figure 5 , in this embodiment, the planetary reducer 4 adopted is a single-stage planetary reducer 4. The housing of the planetary reducer 4 is fixedly connected to the power box 1. The output shaft 3 of the hydraulic motor 5 is synchronously and rotationally connected to the sun gear 22 of the planetary reducer 4. The sun gear 22 meshes with the planetary gears 23 on the planet carrier 24. The planetary gears 23 mesh with the internal gear ring 25. The input shaft 2 is synchronously and rotationally connected to the planet carrier 24 of the planetary reducer 4; in this way, the transmission ratio of the single-stage planetary reducer 4 is generally between 3 and 10, which can fully meet the deceleration requirements of the power head for the hydraulic motor 5, and the vertical dimension is small, which is beneficial to controlling the overall volume of the power head; in specific applications, a hydraulic motor 5 with a speed of three thousand to four thousand revolutions per minute can be adopted, and a single-stage planetary reducer 4 with a transmission ratio between 3 and 4 is used, so that the input shaft 2 reaches a speed of seven hundred to one thousand revolutions per minute, and then the speed range of the output shaft 3 is increased through the self-variable speed of the hydraulic motor 5 and the variable speed of the power box 1 to meet the usage requirements.

[0033] Embodiment 2: Please refer to Figure 6 , the difference from Embodiment 1 is that the output shaft 3 adopts a chuck-type output shaft, and one end of the output shaft 3 extends out of the power box 1 and is connected to the drill pipe through a drill pipe chuck 26.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the technical solutions. Those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solutions of the present invention without departing from the purpose and scope of the present technical solution shall be covered by the scope of the claims of the present invention.

Claims

1. A power head for a vertical axis core drilling rig, characterized in that: It includes a power box, in which a parallel input shaft and an output shaft are rotatably arranged, and one end of the input shaft is connected to the hydraulic motor through a planetary reducer transmission; in the power box, a low-speed driving gear and a high-speed driving gear are synchronously rotated on the input shaft, and a low-speed driven gear and a high-speed driven gear are arranged on the output shaft, the low-speed driven gear is rotatably connected with the output shaft, the low-speed driven gear has external teeth and internal teeth, the external teeth of the low-speed driven gear are meshed with the low-speed driving gear, the high-speed driven gear is synchronously rotatably connected with the output shaft and can slide along the axial direction, when the high-speed driven gear slides to match with the internal teeth of the low-speed driven gear, the output shaft outputs at a low speed, and when the high-speed driven gear slides to mesh with the high-speed driving gear, the output shaft outputs at a high speed; the power head also includes a speed change mechanism for driving the high-speed driven gear to slide.

2. The power head for a vertical axis core drilling rig according to claim 1, characterized in that: A circle of control groove is opened in the axial middle part of the high-speed driven gear. The speed change drive mechanism includes a driving source and a shift fork. The output end of the driving source is transmission-connected with the shift fork head. The shift fork is located in the power box and the shift fork foot is connected with the control groove. The driving source drives the high-speed driven gear to slide axially through the shift fork.

3. The power head for a vertical axis core drilling rig according to claim 2, characterized in that: The axial direction of the shaft hole on the shift fork head corresponds to the width direction of the shift fork foot. The shift fork head is synchronously rotatably connected to the drive shaft through the shaft hole. The drive shaft is rotatably connected in the power box. The drive shaft is perpendicular to the input shaft and is located between the input shaft and the output shaft. The drive source is transmission-connected to the shift fork head through the drive shaft and is used to drive the shift fork to swing. The inner side of the end of the shift fork foot is rotatably connected to a drive block through a rotating shaft. The axial direction of the rotating shaft corresponds to the width direction of the shift fork foot. The drive block is located in the control groove to enable the high-speed driven gear to slide as the shift fork swings.

4. The power head for a vertical axis core drilling machine according to claim 3, characterized in that: A swing arm is synchronously connected to the driving shaft for rotation. The swing arm extends in the radial direction of the driving shaft in the direction opposite to the shift fork. The driving source is a hydraulic cylinder arranged along the axial direction of the input shaft. A matching hole is radially penetrated on the telescopic rod of the hydraulic cylinder. The free end of the swing arm is located in the matching hole. In the axial direction of the telescopic rod, the size of the matching hole is larger than the size of the free end of the swing arm, so that the hydraulic cylinder can drive the driving shaft to rotate through the swing arm and then cause the shift fork to swing.

5. The power head for a vertical axis core drilling machine according to claim 4, characterized in that: The shell of the planetary reducer is connected to the power box and the hydraulic motor respectively, and the hydraulic cylinder is located outside the power box and connected to the side opposite to the hydraulic motor.

6. The power head for a vertical axis core drilling machine according to claim 1, characterized in that: The planetary reducer is a first-stage planetary reducer, the output shaft of the hydraulic motor is connected to the sun gear of the planetary reducer for synchronous rotation, and the input shaft is connected to the planet carrier of the planetary reducer for synchronous rotation.

7. The power head for a vertical axis core drilling machine according to claim 1, characterized in that: The output shaft is a joint type output shaft.

8. The power head for a vertical axis core drilling machine according to claim 1, characterized in that: The output shaft is a chuck type output shaft.

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