Diameter-variable reamer device

Abstract

A variable-diameter reamer device comprises a drill bit body, toothed arms and a connecting rod, a plurality of mounting holes distributed in the radial direction are formed in the position, corresponding to the hinged position of each toothed arm, of the drill bit body, the upper ends of the toothed arms are detachably assembled on the drill bit body through pin shafts inserted into the mounting holes, and the lower ends of the toothed arms are supported on the drill bit body through the connecting rod. The two ends of the connecting rod are detachably assembled with the tooth arm and the drill bit body, the connecting rod is provided with a plurality of different lengths according to different radial positions of the mounting holes, and when the reaming diameter is adjusted, the length of the connecting rod and the positions of the corresponding mounting holes are changed at the same time. And the linear section of the toothed arm after the reaming diameter is adjusted keeps an initial angle with the inner wall of the drill hole all the time. By the adoption of the device, on the basis that the toothed arm is not replaced, variable-diameter reaming can be achieved only by adjusting the position of the toothed arm and the length of the connecting rod, the linear section of the toothed arm keeps an initial angle with the inner wall of a drill hole all the time after the reaming diameter is adjusted, and therefore the whole construction cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of engineering equipment for pile driving operations, in particular to a variable diameter reaming drill device. Background Art

[0002] like Figure 1 As shown, the existing reaming drill device includes a drill bit body and a tooth arm 3, a connecting rod and an upper connecting head 1 installed on the drill bit body. The reaming drill device is mainly used for piling and reaming for construction. The reaming drill device is connected to the rotary drilling rig through the upper connecting head. The tooth arm is linked to the drill bit body to achieve reaming by rotation. The tooth arm 3 is supported by the connecting rod. The reaming drill device of the above structure can slightly change the reaming diameter by replacing the connecting rod. However, since the taper of the tooth arm will be changed, a blind spot will appear at the drilling end, resulting in incomplete reaming, which will affect the stability of the pile; if multiple drill bits of different diameters are purchased, the cost is relatively high, which increases the construction cost. Summary of the invention

[0003] The present invention solves the deficiencies of the prior art and provides a variable diameter reaming drill device which is convenient and quick to assemble and disassemble and has low cost.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a variable diameter hole expansion drill device, including a drill body, a tooth arm and a connecting rod, a plurality of radially arranged mounting holes are provided on the drill body at a hinge position corresponding to each tooth arm, the upper end of the tooth arm is detachably assembled on the drill body by inserting a pin shaft in the mounting hole, and the lower end is supported on the drill body through a connecting rod, both ends of the connecting rod are detachably assembled with the tooth arm and the drill body, the connecting rod is provided with a plurality of different lengths according to the radial position of the mounting hole, the length of the connecting rod corresponds to the mounting hole one by one, when adjusting the hole expansion diameter, by simultaneously changing the length of the connecting rod and the position of the corresponding mounting hole, the straight section of the tooth arm after adjusting the hole expansion diameter always maintains an initial angle with the inner wall of the drill hole.

[0005] In this embodiment, the tooth arm includes an L-shaped tooth plate and a reaming tooth installed on the drilling side of the tooth plate, the L-shaped tooth plate includes an inclined section and a straight section, one end of the inclined section is connected to the straight section and an angle is provided between the two, the other end of the inclined section is hinged to the drill bit body, the inclined section is used to hinge the straight section to the drill bit body, one end of the connecting rod is connected to the drill bit body, and the other end is connected to the connection between the inclined section and the vertical section.

[0006] In this embodiment, the two ends of the connecting rod are detachably assembled with the tooth arm and the drill body through a pin shaft.

[0007] In this embodiment, the pin shaft is locked in the mounting hole through a split pin.

[0008] In this embodiment, the split pin is a β pin.

[0009] In this embodiment, the length of the straight segment is 30% to 40% of the length of the inclined segment.

[0010] In this embodiment, an upper connector for connecting to a rotary drilling rig is coaxially fixed to the top of the drill body, and a support plate is coaxially fixed to the bottom of the drill body, wherein the outer diameter of the support plate is smaller than the diameter of the expanded hole.

[0011] In this embodiment, the diameter of the support plate is 50-60% of the outer diameter of the drill body.

[0012] Due to the adoption of the above scheme, the device has the following advantages: 1. Compared with the prior art, the present invention can realize variable diameter hole expansion by adjusting the position of the tooth arm and the length of the connecting rod without replacing the tooth arm, and the straight section of the tooth arm always maintains the initial angle with the inner wall of the drilled hole after adjusting the hole expansion diameter, thereby adapting to the requirements of the diameter of the pile bottom hole expansion in different environments and ensuring the same forming taper.

[0013] 2. Compared with the prior art, the tooth arm of the present invention is designed according to the shape of the hole expansion, the length of the straight section is increased, and the percentage of the straight section in the length of the inclined section is increased from the original 10% to 30% to 40%, thereby reducing the blind area of ​​the hole expansion.

[0014] 3. Compared with the prior art, the present invention increases the diameter of the support plate, and the percentage of the support plate in the drill bit body diameter is increased from the original 20% to 50-60%, thereby improving effective support and facilitating drilling in the Loess Plateau environment.

[0015] To sum up, the device can achieve variable diameter hole expansion by adjusting the position of the tooth arm and the length of the connecting rod without replacing the tooth arm, and the straight section of the tooth arm always maintains the initial angle with the inner wall of the drill hole after adjusting the hole expansion diameter, thereby reducing the cost of the entire construction. Moreover, the tooth arm is connected to the drill bit body through a pin shaft, and disassembly and assembly are convenient and quick, which will not affect the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an existing hole expanding device.

[0017] Figure 2 It is a structural schematic diagram of the present invention.

[0018] Figure 3 Schematic diagram of the pile hole structure.

[0019] Figure 4 It is a schematic structural diagram of the pin shaft of the present invention.

[0020] Figure 5 This is a state diagram when the hole expansion diameter is adjusted in the present invention.

[0021] Figure 6 This is a state diagram after adjusting the hole expansion diameter according to the present invention.

[0022] Among them, 1. upper connecting head; 2. drill bit body; 3. tooth arm; 4. connecting rod; 5. support plate; 6. mounting hole; 7. pin shaft; 8. cotter pin. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] like Figure 1-Figure 6 As shown, a variable diameter reaming drill device comprises a drill body 2, a tooth arm 3 and a connecting rod 4, wherein an upper connecting head 1 for connecting with a rotary drilling rig is coaxially fixed to the top of the drill body 2, and a supporting plate 5 is coaxially fixed to the bottom of the drill body 2, wherein the outer diameter of the supporting plate 5 is smaller than the reaming diameter; The tooth arm 3 includes an L-shaped tooth plate and a reaming tooth installed on the drilling side of the tooth plate, the L-shaped tooth plate includes an inclined section and a straight section, one end of the inclined section is connected to the straight section and an angle is set between the two. In this embodiment, the angle is an obtuse angle; like Figure 2 As shown, three mounting holes 6 radially arranged along the drill body 2 are provided on the drill body 2 and at the hinges corresponding to each tooth arm 3. In the present embodiment, the spacings between adjacent mounting holes 6 are the same. Of course, the spacings between the mounting holes 6 may also be different and may be adjusted according to actual conditions. The upper end of the inclined section of the tooth arm 3 is detachably assembled on the drill body 2 by inserting a pin shaft 7 in the mounting hole 6. The tooth arm 3 is supported on the drill body 2 by a connecting rod 4 at the connection between the inclined section and the vertical section. The connecting rod 4 is provided with a plurality of connecting rods to form a plurality of models matching the number of mounting holes, and each connecting rod 4 of different length corresponds to a mounting hole 6 at a position. When the hole diameter needs to be adjusted, the model of the connecting rod 4 is replaced and the mounting hole 6 corresponding to the tooth arm 3 is adjusted. The tooth arm 3 is supported to a suitable position by the length of the connecting rod 4 to ensure that the straight section of the tooth arm 3 and the inner wall of the drill hole maintain an initial angle unchanged after the hole diameter is adjusted.

[0025] Furthermore, both ends of the connecting rod 4 are also detachably assembled with the tooth arm 3 and the drill body 2 through a pin shaft 7, and the pin shaft 7 is axially locked in the mounting hole 6 through a cotter pin 8, and the cotter pin 8 is a β pin.

[0026] like Figure 3 As shown, Xi represents the diameter of the pile hole first drilled by the rotary drilling rig during a single construction, Zi represents the width of the single-side bottom expansion required for hole expansion, and Yi represents the height of the hole expansion. The present application can meet the requirements of the same Xi hole type and different hole expansion Zi and Yi by changing the mounting hole 6 and the connecting rod 4 at the same time, thereby achieving the purpose of economy. In the art, αi in the figure has three meanings: 1. The angle between the bottom of the required pile hole and the side wall of the expansion plane; 2. The angle between the tooth arm 3 and the bottom of the pile hole; 3. To form the bottom angle of the cast pile.

[0027] In this embodiment, the construction requirement of αi is 90 degrees. By adopting the above-mentioned structure of the present application, when it is necessary to change the diameter of the hole expansion during construction, it is only necessary to change the length of the connecting rod 4 and the position of the mounting hole 6 of the corresponding tooth arm 3 to ensure that after adjusting the hole expansion diameter, the straight section of the tooth arm 3 and the inner wall of the drill hole maintain the initial angle unchanged, thereby reducing the blind area of ​​the hole expansion; since the connecting rod 4 is low in cost, replacing the connecting rod 4 can reduce the cost of the entire construction, and the tooth arm 3 is connected to the drill bit body 2 through a pin shaft, and disassembly and assembly are also convenient and quick, and will not affect the construction efficiency.

[0028] The above-mentioned specific embodiments are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product form and style of the above-mentioned specific embodiments. Any variable diameter reaming drill device that complies with the claims of the present invention and any appropriate changes or modifications made thereto by ordinary technicians in the corresponding technical field shall fall within the patent protection scope of the present invention.

Claims

1. A variable diameter reaming drill device, comprising a drill body (2), a tooth arm (3) and a connecting rod (4), characterized in that: A plurality of mounting holes (6) arranged radially are provided on the drill body (2) at hinged positions corresponding to each tooth arm (3); the upper end of the tooth arm (3) is detachably mounted on the drill body (2) via a pin shaft (7) inserted into the mounting hole (6); the lower end of the tooth arm (3) is supported on the drill body (2) via a connecting rod (4); both ends of the connecting rod (4) are detachably mounted on the tooth arm (3) and the drill body (2); the connecting rod (4) is provided with a plurality of different lengths according to different radial positions of the mounting holes (6); when adjusting the hole diameter, by simultaneously changing the length of the connecting rod (4) and the position of the corresponding mounting hole (6), the straight section of the tooth arm (3) after adjusting the hole diameter always maintains an initial angle with the inner wall of the drill hole.

2. A variable diameter reaming drill device according to claim 1, characterized in that: The tooth arm (3) comprises an L-shaped tooth plate and reaming teeth installed on the drilling side of the tooth plate, the L-shaped tooth plate comprises an inclined section and a straight section, one end of the inclined section is connected to the straight section and an angle is provided between the two, the other end of the inclined section is hinged to the drill bit body (2), one end of the connecting rod (4) is connected to the drill bit body (2), and the other end is connected to the connection between the inclined section and the vertical section.

3. A variable diameter reaming drill device according to claim 2, characterized in that: The two ends of the connecting rod (4) are detachably assembled with the tooth arm (3) and the drill head body (2) through pins.

4. The variable diameter reaming drill device according to claim 1, characterized in that: The pin shaft (7) is locked in the mounting hole (6) via a cotter pin (8).

5. A variable diameter reaming drill device according to claim 4, characterized in that: The split pin (8) is a β pin.

6. A variable diameter reaming drill device according to claim 2, characterized in that: The length of the straight section is 30% to 40% of the length of the inclined section.

7. A variable diameter reaming drill device according to any one of claims 1 to 6, characterized in that: A support plate (5) is coaxially fixed to the bottom end of the drill bit body (2), and the outer diameter of the support plate (5) is smaller than the diameter of the expanded hole.

8. A variable diameter reaming drill device according to claim 7, characterized in that: The diameter of the support plate (5) is 50-60% of the outer diameter of the drill body (2).

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