Variable diameter reamer device

Abstract

A variable diameter reaming drill device includes a drill bit body, toothed arms, and a connecting rod. The drill bit body has multiple radially arranged mounting holes at hinge positions corresponding to each toothed arm. The upper end of each toothed arm is detachably mounted to the drill bit body via a pin inserted into one of the mounting holes, and the lower end is supported on the drill bit body via the connecting rod. Both ends of the connecting rod are detachably mounted to both the toothed arms and the drill bit body. The connecting rod has multiple different lengths depending on the radial position of the mounting holes. When adjusting the reaming diameter, the length of the connecting rod and the position of the corresponding mounting holes are changed simultaneously, ensuring that the straight segment of the toothed arm maintains its initial angle with the inner wall of the borehole after the diameter adjustment. Using this device, variable diameter reaming can be achieved without changing the toothed arms, simply by adjusting the position of the toothed arms and the length of the connecting rod, while ensuring that the straight segment of the toothed arm maintains its initial angle with the inner wall of the borehole after the diameter adjustment, thereby reducing the overall construction cost.

Description

Technical Field

[0001] This invention relates to the field of engineering equipment technology for piling operations, specifically to a variable diameter reaming drill device. Background Technology

[0002] like Figure 1 As shown, the existing reaming drill device includes a drill bit body and a toothed arm 3, a connecting rod, and an upper connector 1 mounted on the drill bit body. The reaming drill device is mainly used for reaming holes in building pile driving. The reaming drill device is connected to a rotary drilling rig through the upper connector. The toothed arm is linked with the drill bit body and reams the hole by rotation. The toothed arm 3 is supported by the connecting rod. The reaming drill device with the above structure can slightly change the reaming diameter by changing the connecting rod, but because it will change the taper of the toothed arm, a blind zone will appear at the drilling end, resulting in incomplete reaming and affecting the stability of the pile. If multiple drill bits of different diameters are purchased, the cost will be high, which will increase the construction cost. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a variable diameter reamer device that is easy and quick to assemble and disassemble, and has low cost.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a variable diameter reaming drill device, including a drill bit body, a toothed arm, and a connecting rod. The drill bit body has multiple mounting holes arranged radially at the hinge positions corresponding to each toothed arm. The upper end of the toothed arm is detachably assembled to the drill bit body by a pin inserted into the mounting hole, and the lower end is supported on the drill bit body by the connecting rod. Both ends of the connecting rod are detachably assembled to the toothed arm and the drill bit body. The connecting rod has multiple different lengths according to the different radial positions of the mounting holes. The length of the connecting rod corresponds one-to-one with the mounting hole. When adjusting the reaming diameter, by simultaneously changing the length of the connecting rod and the position of the corresponding mounting hole, the straight segment of the toothed arm after adjusting the reaming diameter always maintains the initial angle with the inner wall of the borehole.

[0005] In this embodiment, the toothed arm includes an L-shaped toothed plate and a reaming tooth installed on the drilling side of the toothed plate. The L-shaped toothed plate includes an inclined section and a straight section. One end of the inclined section is connected to the straight section and there is an included angle 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 toothed arm and the drill bit body respectively via pins.

[0007] In this embodiment, the pin is locked in the mounting hole by a cotter pin.

[0008] In this embodiment, the cotter 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, the top end of the drill bit body is coaxially fixed with an upper connector for connecting to a rotary drilling rig, and the bottom end of the drill bit body is coaxially fixed with a support plate, the outer diameter of which is smaller than the diameter of the hole.

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

[0012] Due to the adoption of the above scheme, this device has the following advantages:

[0013] 1. Compared with the prior art, the present invention can achieve variable diameter hole enlargement by simply adjusting the position of the toothed arm and the length of the connecting rod without changing the toothed arm. Moreover, after adjusting the enlargement diameter, the straight section of the toothed arm always maintains the initial angle with the inner wall of the borehole, thereby adapting to the diameter requirements of pile bottom hole enlargement in different environments and ensuring the same forming taper.

[0014] 2. Compared with the prior art, the present invention designs the toothed arm according to the hole enlargement shape, increases the length of the straight section, and increases the percentage of the straight section to the length of the inclined section from the original 10% to 30% to 40%, thereby reducing the hole enlargement blind zone.

[0015] 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 diameter of the drill bit body increases from the original 20% to 50-60%, which improves the effective support and is beneficial for drilling in the Loess Plateau environment.

[0016] In summary, this device can achieve variable diameter hole enlargement without replacing the toothed arm, simply by adjusting the position of the toothed arm and the length of the connecting rod. Furthermore, it ensures that the straight section of the toothed arm always maintains its initial angle with the inner wall of the borehole after adjusting the enlargement diameter, thereby reducing the overall construction cost. In addition, the toothed arm is connected to the drill bit body via a pin, making disassembly and assembly convenient and quick, without affecting construction efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an existing hole-reaming device.

[0018] Figure 2 This is a schematic diagram of the structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the pile hole structure.

[0020] Figure 4 This is a schematic diagram of the pin structure of the present invention.

[0021] Figure 5 This is a diagram showing the state when adjusting the diameter of the enlarged hole according to the present invention.

[0022] Figure 6 This is a diagram showing the state after adjusting the diameter of the enlarged hole according to the present invention.

[0023] The components include: 1. Upper connector; 2. Drill bit body; 3. Tooth arm; 4. Connecting rod; 5. Support plate; 6. Mounting hole; 7. Pin; 8. Cotter pin. Detailed Implementation

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] like Figures 1-6 As shown, a variable diameter reaming drill device includes a drill bit body 2, a toothed arm 3 and a connecting rod 4. The top end of the drill bit body 2 is coaxially fixed with an upper connecting head 1 for connecting with a rotary drilling rig, and the bottom end of the drill bit body 2 is coaxially fixed with a support plate 5. The outer diameter of the support plate 5 is smaller than the reaming diameter.

[0026] The toothed arm 3 includes an L-shaped toothed plate and a hole-reaming tooth installed on the drilling side of the toothed plate. The L-shaped toothed plate includes an inclined section and a straight section. One end of the inclined section is connected to the straight section and there is an included angle between the two. In this embodiment, the included angle is an obtuse angle.

[0027] like Figure 2 As shown, the drill bit body 2 has three mounting holes 6 arranged radially along the drill bit body 2 at the hinge corresponding to each tooth arm 3. In this embodiment, the spacing between adjacent mounting holes 6 is the same, but the spacing between mounting holes 6 can also be different and can be adjusted according to the actual situation. The upper end of the inclined section of the tooth arm 3 is detachably assembled to the drill bit body 2 by inserting a pin 7 into the mounting hole 6. The tooth arm 3 is supported on the drill bit body 2 by a connecting rod 4 at the connection between the inclined section and the vertical section. There are multiple connecting rods 4, forming multiple models that match the number of mounting holes. Each connecting rod 4 of different length corresponds to a mounting hole 6 at a certain position. When it is necessary to adjust the enlargement diameter, the model of the connecting rod 4 is changed and the mounting hole 6 corresponding to the tooth arm 3 is adjusted. The length of the connecting rod 4 is used to support the tooth arm 3 to a suitable position, ensuring that the straight section of the tooth arm 3 and the inner wall of the borehole remain unchanged after the enlargement diameter is adjusted.

[0028] Furthermore, both ends of the connecting rod 4 are detachably assembled with the toothed arm 3 and the drill body 2 respectively via pins 7. The pins 7 are axially locked in the mounting hole 6 by cotter pins 8, which are β pins.

[0029] like Figure 3 As shown, Xi represents the diameter of the pile hole drilled by the rotary drilling rig in a single construction operation, Zi represents the width of the single-sided enlargement required, and Yi represents the height of the enlargement. This application, by simultaneously changing the mounting hole 6 and the connecting rod 4, can meet the requirements of the same Xi hole type but different Zi and Yi for enlargement, achieving an economical goal. In this field, αi in the figure has three meanings:

[0030] 1. The angle between the bottom of the required pile hole and the side wall of the enlarged hole plane;

[0031] 2. The angle between tooth arm 3 and the bottom of the pile hole;

[0032] 3. The bottom angle of the cast-in-place pile.

[0033] In this embodiment, the construction requirement for αi is 90 degrees. Using the structure described above, when it is necessary to change the diameter of the borehole, it is only necessary to change the length of the connecting rod 4 and the position of the mounting hole 6 of the corresponding toothed arm 3 to ensure that the straight section of the toothed arm 3 maintains the initial angle with the inner wall of the borehole after adjusting the borehole diameter, thereby reducing the blind zone of the borehole. Since the connecting rod 4 is low in cost, replacing the connecting rod 4 can reduce the overall construction cost. Moreover, the toothed arm 3 is connected to the drill bit body 2 through the pin, and the disassembly and assembly are convenient and quick, without affecting the efficiency of construction.

[0034] The above-described specific embodiments are merely specific examples 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-described specific embodiments. Any variable diameter reamer device that conforms to the claims of the present invention and any appropriate changes or modifications made to it by a person skilled in the art should fall within the patent protection scope of the present invention.

Claims

1. A variable diameter reamer, comprising a drill bit body (2), a toothed arm (3), and a connecting rod (4), characterized in that: The drill bit body (2) has multiple mounting holes (6) arranged radially at the hinge position corresponding to each tooth arm (3). The upper end of the tooth arm (3) is detachably assembled to the drill bit body (2) through a pin (7) inserted into the mounting hole (6). The lower end of the tooth arm (3) is supported on the drill bit body (2) through a connecting rod (4). Both ends of the connecting rod (4) are detachably assembled to the tooth arm (3) and the drill bit body (2). The connecting rod (4) has multiple different lengths depending on the radial position of the mounting hole (6). When adjusting the enlarged 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 enlarged hole diameter always maintains the initial angle with the inner wall of the borehole. The toothed arm (3) includes an L-shaped toothed plate and a reaming tooth installed on the drilling side of the toothed plate. The L-shaped toothed plate includes an inclined section and a straight section. One end of the inclined section is connected to the straight section and there is an angle between the two. The other end of the inclined section is hinged to the drill body (2). One end of the connecting rod (4) is connected to the drill body (2), and the other end is connected to the connection between the inclined section and the vertical section. The length of the straight section is 30% to 40% of the length of the inclined section; a support plate (5) is coaxially fixed at 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 hole enlargement; the diameter of the support plate (5) is 50% to 60% of the outer diameter of the drill bit body (2).

2. The variable diameter reamer device according to claim 1, characterized in that: The two ends of the connecting rod (4) are detachably assembled with the toothed arm (3) and the drill bit body (2) respectively via pins.

3. The variable diameter reamer device according to claim 1, characterized in that: The pin (7) is locked in the mounting hole (6) by a cotter pin (8).

4. The variable diameter reamer device according to claim 3, characterized in that: The cotter pin (8) is a β pin.

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