Hydraulic clamping type through shaft power head

Abstract

The utility model provides a hydraulic clamping type through shaft power head. The hydraulic clamping type through shaft power head comprises a gearbox, a power motor, a hydraulic oil cylinder, a hollow main shaft, a slip and a slip seat, a slip groove is formed in the inner end of the hollow main shaft, a slip is movably arranged in the slip groove, the slip is matched with a slip seat through an inclined plane, and the slip seat is connected with a piston rod of a hydraulic oil cylinder; a sliding groove is formed in the slip, a connecting hole is formed in the slip seat, a connecting bolt is inserted into the connecting hole, the top of the connecting bolt is arranged in the sliding groove in a sliding mode and limited by the sliding groove and cannot move out in the radial direction, and the bottom of the connecting bolt is fixed through a nut in the connecting hole. According to the utility model, the defects of small clamping force and unstable structure of two common drill bit clamping modes are overcome, the thrust generated by the hydraulic oil cylinder can be transmitted to the maximum extent, the generated clamping force depends on the thrust and the stroke of the hydraulic oil cylinder, and the slips are pulled out from the slip grooves during reversing, so that the drill rod is loosened.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling rig power heads, in particular to a hydraulic clamping through-shaft power head. Background Art

[0002] Pile drilling rigs are specialized machines widely used for well and pile construction. They are widely used in water well construction in water-scarce areas, drilling air conditioning wells for ground-source heat pumps, and constructing pile holes for high-rise building foundations and bridge foundations in urban construction. The through-shaft power head, the core output component of the pile drilling rig, converts the hydraulic energy generated by the power source into mechanical energy. The resulting torque, speed, and pressure are transmitted to the drill pipe through the clamping mechanism, ensuring the desired penetration rate, torque, and feed rate. Currently, through-shaft power heads generally use two methods to clamp the drill pipe. The first method uses a hydraulic and mechanical approach. The recoil of a disc spring pushes a beveled slip seat on a single-acting cylinder, which moves axially along the main shaft of the drill head. The slip seat pushes the slips within the beveled slip seat radially toward the main shaft, clamping the slips. The single-acting cylinder then pushes the slip seat and disc spring in opposite directions, causing the slips to expand radially toward the main shaft, releasing the drill pipe. The clamping capacity of this method depends on the spring force of the disc spring, and the travel of the slips' tightening and loosening depends on the amount of compression. Due to the disc spring's frequent compression and rebound during operation, its compression decreases. This reduced compression travel weakens the clamping force on the drill string, resulting in a loose drill string. The second clamping method utilizes a fully hydraulic system. This system uses the tension generated by the piston rods of two double-acting cylinders located on either side of the spindle to pull a beveled slip seat axially along the spindle. The tapered surface of the slip seat pushes the slips radially toward the spindle, locking the drill string within the spindle. The clamping force of this type of clamping system depends on the retraction force of the cylinder, and the travel of the slips depends on the cylinder's stroke. This system, based on a tapered slip seat, can only retract the slips radially toward the spindle, not expand them. This can also easily cause the slips to fall into the spindle of a through-hole spindle. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of the above-mentioned background technology and provide a hydraulic clamping through-axis power head, including a gear box, a power motor, a hydraulic cylinder, a hollow main shaft, slips and a slip seat;

[0004] An input gear and a transmission gear are provided in the gear box, the power motor is connected to the input gear provided in the gear box, the input gear is meshed with the transmission gear, and the transmission gear is connected to the hollow main shaft;

[0005] The inner end of the hollow main shaft is provided with a cava groove, and the cava is movably arranged in the cava groove. The cava cooperates with the cava seat through an inclined surface, and the cava seat is connected to the piston rod of the hydraulic cylinder; a slide groove is provided on the cava seat, and a connecting hole is provided on the cava seat. A connecting bolt is inserted in the connecting hole, and the top of the connecting bolt is slidably set in the slide groove and is limited by the slide groove and cannot be moved radially out, and the bottom of the connecting bolt is fixed by a nut in the connecting hole.

[0006] Furthermore, the slip groove is configured to be square.

[0007] Furthermore, four slip grooves are provided and are distributed annularly and symmetrically relative to the hollow main shaft.

[0008] Furthermore, the slide groove is configured as an inverted T-shape.

[0009] Furthermore, a guide sleeve for radial limiting is provided between the inner end of the hollow main shaft and the piston rod of the hydraulic cylinder.

[0010] Furthermore, a thrust cylindrical roller bearing is installed between the hydraulic cylinder and the cava seat. The thrust cylindrical roller bearing consists of a left plate seat ring, a middle ball, and a right plate shaft ring. The left plate seat ring is fixedly connected to the cava seat, and the right plate shaft ring is fixedly connected to the piston rod of the hydraulic cylinder.

[0011] The above solution of the utility model has the following beneficial effects:

[0012] The hydraulic clamping through-axis power head provided by the utility model solves the defects of the two commonly used drill bit clamping methods, namely, weak clamping force and unstable structure. The thrust generated by the hydraulic cylinder can be transmitted to the maximum extent through the connection between the piston rod of the hydraulic cylinder and the slip seat, and the cooperation between the slip seat and the slip. The generated clamping force depends on the thrust and stroke of the hydraulic cylinder. As long as the pressure and stroke of the hydraulic cylinder are effectively set, the drill rod can obtain a stable clamping force, and it is ensured that the slips are pulled out of the slip groove in the reverse direction to loosen the drill rod. In addition, the eccentricity phenomenon that occurs when the drill rod is clamped can be avoided.

[0013] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a front view of the overall structure of the utility model;

[0016] Figure 3 for Figure 2DD cross-sectional view;

[0017] Figure 4 for Figure 2 FF cross-sectional view;

[0018] Figure 5 for Figure 3 Enlarged view of point A.

[0019] [Description of Reference Numerals]

[0020] 1-gearbox; 2-power motor; 3-hydraulic cylinder; 4-hollow main shaft; 5-input gear; 6-transmission gear; 7-slip; 8-slip seat; 9-connecting hole; 10-connecting bolt; 11-guide sleeve; 12-thrust cylindrical roller bearing. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a locking connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1 、 Figure 2As shown, the embodiment of the present invention provides a hydraulic clamping through-axis power head, including a gear box 1, a power motor 2, a hydraulic cylinder 3 and a hollow main shaft 4. Figure 3 As shown, the power motor 2 is connected to the input gear 5 in the gear box 1, the input gear 5 is engaged with the transmission gear 6, and the transmission gear 6 is connected to the hollow main shaft 4, thereby driving the hollow main shaft 4 to rotate.

[0025] Among them, the inner end of the hollow main shaft 4 ( Figure 3 The right end (as shown) of the hollow spindle 4 is provided with a plurality of evenly distributed square slip grooves. The hydraulic clamping through-axis power head also includes slips 7 and slip seats 8. The slips 7 are movably arranged within the slip grooves and engage with the slip seats 8 via inclined surfaces. The slip seats 8 are connected to the piston rod of the hydraulic cylinder 3. When the piston rod of the hydraulic cylinder 3 moves leftward along the axis of the hollow spindle 4, the slip seats 8 slide leftward under the drive of the hydraulic cylinder 3. Because the slips 7 are confined within the slip grooves of the hollow spindle 4 and can only move up and down along the inclined surface of the slip seat 8, they are moved into the interior of the hollow spindle 4 under the action of the inclined surface, thereby clamping the drill rod within the hollow spindle 4.

[0026] At the same time, the slips 7 are provided with a chute, and the slip seat 8 is provided with a connecting hole 9. In this embodiment, the chute is configured as an inverted T-shape, and a connecting bolt 10 is inserted into the connecting hole 9. The top (nut) of the connecting bolt 10 slides within the chute and is restrained by the chute, preventing radial movement. The bottom of the connecting bolt 10 is secured by a nut provided at the countersunk position of the connecting hole 9. Therefore, when the piston rod of the hydraulic cylinder 3 moves rightward along the axis of the hollow main shaft 4, pulling the slip seat 8 to slide rightward. Under the action of the connecting bolt 10, the slips 7 will slide in the opposite direction along the inclined surface of the slip seat 8, causing the slips 7 to open outward relative to the hollow main shaft 4, thereby loosening the drill rod. Of course, in other embodiments, a connecting block matching the shape of the inverted T-shaped chute can also be provided at the inclined surface of the slip seat 8 to achieve the same effect as the slips 7 opening outward relative to the hollow main shaft 4 when the slip seat 8 slides rightward.

[0027] At the same time Figure 4 As shown, as a preferred embodiment, in this embodiment, a total of four cava 7 are arranged around the hollow main shaft 4 and are evenly distributed in a ring shape. When the cava 7 is radially retracted into the hollow main shaft 4, the drill rod is clamped to rotate synchronously with the hollow main shaft 4. When the cava 7 is radially extended out of the hollow main shaft 4, the drill rod will be loosened and will not rotate synchronously with the hollow main shaft 4.

[0028] Figure 5 yes Figure 3A partial enlarged view of area A shows that in this embodiment, the radial limitation between the inner end of the hollow main shaft 4 and the piston rod of the hydraulic cylinder 3 is completed by the guide sleeve 11. When the piston rod of the hydraulic cylinder 3 pushes left and right, the second end of the hollow main shaft 4 can maintain coaxiality, thereby better ensuring that the drill rod moves in the inner center of the hollow main shaft 4. At the same time, the hydraulic cylinder 3 and the cava seat 8 are installed with a thrust cylindrical roller bearing 12. The thrust cylindrical roller bearing 12 consists of a left plate seat ring, a middle ball, and a right plate shaft ring. The left plate seat ring is fixedly connected to the cava seat 8, and the right plate shaft ring is fixedly connected to the piston rod of the hydraulic cylinder 3. When rotating, the hydraulic cylinder 3 pushes the cava seat 8 to the left, so that the cava 7 moves toward the center line inside the hollow main shaft 4 to clamp the drill rod. The left plate seat ring of the thrust cylindrical roller bearing 12 rotates, and the piston rod of the hydraulic cylinder 3 will not rotate with the right plate shaft ring under the action of the rotation of the middle ball of the thrust cylindrical roller bearing 12, which reduces the wear of the internal seals of the hydraulic cylinder 3 and reduces the maintenance cost for future inspections.

[0029] As described above, the hydraulic clamping through-axis power head provided in this embodiment solves the defects of the two commonly used drill bit clamping methods, namely, weak clamping force and unstable structure. By connecting the piston rod of the hydraulic cylinder 3 with the cava seat 8 and cooperating with the cava seat 8 and the cava 7, the thrust generated by the hydraulic cylinder 3 can be maximized. The clamping force generated depends on the thrust and stroke of the hydraulic cylinder 3. As long as the pressure and stroke of the hydraulic cylinder 3 are effectively set, the drill rod can obtain a stable clamping force and can avoid the eccentricity phenomenon that occurs when the drill rod is clamped.

[0030] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0031] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A hydraulic clamping through-axis power head, characterized in that: Including gear box, power motor, hydraulic cylinder, hollow main shaft, slips and slip seats; An input gear and a transmission gear are provided in the gear box, the power motor is connected to the input gear provided in the gear box, the input gear is meshed with the transmission gear, and the transmission gear is connected to the hollow main shaft; The inner end of the hollow main shaft is provided with a cava groove, and the cava is movably arranged in the cava groove. The cava cooperates with the cava seat through an inclined surface, and the cava seat is connected to the piston rod of the hydraulic cylinder; a slide groove is provided on the cava seat, and a connecting hole is provided on the cava seat. A connecting bolt is inserted in the connecting hole, and the top of the connecting bolt is slidably set in the slide groove and is limited by the slide groove and cannot be moved radially out, and the bottom of the connecting bolt is fixed by a nut in the connecting hole.

2. A hydraulic clamping through-axle power head according to claim 1, characterized in that: The slip groove is arranged in a square shape.

3. A hydraulic clamping through-axle power head according to claim 1, characterized in that: The four slip grooves are arranged and are distributed annularly and symmetrically relative to the hollow main shaft.

4. The hydraulic clamping through-axle power head according to claim 1, characterized in that: The slide is configured as an inverted T-shape.

5. The hydraulic clamping through-axle power head according to claim 1, characterized in that: A guide sleeve for radial limiting is also provided between the inner end of the hollow main shaft and the piston rod of the hydraulic cylinder.

6. The hydraulic clamping through-axle power head according to claim 1, characterized in that: A thrust cylindrical roller bearing is installed between the hydraulic cylinder and the slip seat. The thrust cylindrical roller bearing consists of a left plate seat ring, a middle ball, and a right plate shaft ring. The left plate seat ring is fixedly connected to the slip seat, and the right plate shaft ring is fixedly connected to the piston rod of the hydraulic cylinder.

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