A bottom-expanding drill with limit position conveniently adjusted

Abstract

The utility model discloses a convenient adjustment limit's bottom expander, relate to engineering construction technical field. The utility model discloses: the rotation box is built in two end through's limit pipe, and the both sides of rotation box are open and are arranged, and the rotation box is hinged with two extension arms in, and two extension arms are about limit pipe symmetrical setting, bottom support drill, including the mobile part of sliding in the limit pipe and the abutting portion of setting in the mobile part bottom, and the abutting portion is located below the limit pipe, and the both sides of abutting portion are hinged with support rod respectively, and the other end of support rod is hinged with the bottom side of extension arm, top limit mechanism, including the telescopic mechanism of installing in the limit pipe, and the telescopic end of telescopic mechanism sets down, and the telescopic end of telescopic mechanism installs the limit board, and the outer wall of limit board and the inner wall of limit pipe are sliding and abut and set up, to solve the problem that the bottom expander of current can not enlarge the bottom expansion state in the hole.

Description

Technical Field

[0001] This utility model relates to the field of engineering construction technology, specifically, it is a bottom-expanding drill with convenient adjustable limit. Background Technology

[0002] As a key foundation form in civil engineering, building construction, and transportation infrastructure, pile foundation engineering's core function is to transfer the load of the superstructure to the deep, stable bearing layer through the piles, ensuring the long-term safety and stability of the structure. With modern engineering construction trending towards higher-rise buildings, larger spans, and heavier loads, higher requirements are being placed on the bearing capacity of pile foundations.

[0003] While traditional constant-diameter bored piles are widely used, their end resistance is limited. To meet bearing capacity requirements, the pile length or diameter often needs to be increased, leading to high material consumption, long construction periods, and high costs. Against this backdrop, enlarged-base pile technology has emerged. By increasing the pile diameter at a specific depth at the pile tip, the bearing area is increased, significantly improving the end resistance and overall bearing capacity. Simultaneously, the pile length or diameter is reduced, lowering material and construction costs, making it one of the mainstream choices for high-bearing-capacity pile foundations.

[0004] Rotary drilling rigs have become the mainstream equipment for pile construction in China due to their advantages such as high drilling efficiency, high degree of automation, and strong adaptability to complex geological formations. However, traditional rotary drilling rigs mainly operate with equal-diameter holes. If directly applied to the construction of enlarged-base piles, additional enlargement devices are required. Early enlargement techniques relied heavily on manual labor or simple machinery, resulting in low efficiency, poor accuracy, and high safety risks, making them unsuitable for the high-efficiency construction requirements of rotary drilling rigs. Therefore, the application of specialized rotary drilling rigs with enlarged-base drills has become crucial for improving construction efficiency.

[0005] Current reaming drills have the problem of difficulty in adjusting the reaming range of the hole. After completing one reaming operation, if it is necessary to increase the reaming range, the entire reaming drill must be removed from the hole, the position of the fiber pin adjusted, and then the reaming drill inserted again to continue the reaming operation. This seriously affects the efficiency of the construction work. Utility Model Content

[0006] The purpose of this invention is to provide a convenient adjustable limit reamer to solve the problem that existing reamers cannot expand the reamer's position in the hole.

[0007] To solve the above problems, the present invention adopts the following technical means: A reamer with convenient adjustable limits, comprising: A rotating box has a limiting tube that extends through both ends. The two sides of the rotating box are open. Two extension arms are hinged inside the rotating box and are symmetrically arranged about the limiting tube. The bottom support drill includes a movable part that is slidably disposed within the limiting tube and an abutting part disposed at the bottom end of the movable part. The abutting part is disposed below the limiting tube, and support rods are respectively hinged to both sides of the abutting part. The other end of the support rods is hinged to the bottom side of the extension arm. The top limiting mechanism includes a telescopic mechanism installed inside the limiting tube. The telescopic end of the telescopic mechanism is set downward, and a limiting plate is installed on the telescopic end of the telescopic mechanism. The outer wall of the limiting plate is slidably abutting against the inner wall of the limiting tube.

[0008] Preferably, the telescopic mechanism is a rotary motor, the rotating end of which extends downward and is coaxially mounted with a threaded rod, the limiting plate is mounted on the threaded rod, and the limiting plate and the threaded rod are connected by threads.

[0009] Furthermore, the movable part is a hollow structure with an open top, and the bottom end of the threaded rod is directly opposite the open position at the top of the movable part.

[0010] Furthermore, the rotating box includes a top frustum, on the bottom surface of which two opposing positioning plates are mounted. The limiting tube and the extending arm are both located between the two positioning plates. The top end of the extending arm is hinged to the side wall of the positioning plate. The two outer walls of the limiting tube are connected to the side wall of the positioning plate. A driving tube is detachably mounted on the top surface of the top frustum. The driving tube communicates with the limiting tube and is used for transmission connection with the rotating end of an external rotating mechanism.

[0011] Furthermore, a reinforcing mechanism is installed on the outer wall of the positioning plate. The reinforcing mechanism includes an arc-shaped plate coaxially arranged with the top frustum. Several arc-shaped plates are arranged sequentially along the axial direction of the top frustum, and adjacent arc-shaped plates are connected by connecting ribs.

[0012] Furthermore, the abutting part includes a positioning block connected to the bottom end of the limiting tube, the side wall of the positioning block is hinged to the support rod, and a first drill bit is installed on the bottom surface of the positioning block.

[0013] Furthermore, a second drill bit is constructed on the side of the extended arm opposite to the rotating box.

[0014] This utility model has the following beneficial effects during use: When using a reamer for hole enlargement, during the insertion of the reamer into the hole, the bottom support drill descends under its own weight. Under the action of the support rod, limiting tube, and moving part, combined with the pulling force of the abutment part, the expanding arm is in a retracted state, bringing its bottom end close to the outer wall of the limiting tube. As the bottom support drill descends, once its abutment part contacts the bottom of the hole, it continuously presses down on the rotating box, causing the moving part of the bottom support drill to move upward relative to the limiting tube. This, in turn, allows the expanding arms on both sides to unfold under the action of the support rod, thus enlarging the hole. The limiting plate located inside the limiting tube restricts the upward movement of the moving part relative to the limiting tube, thereby limiting the expansion distance of the expanding arm. Using the reamer according to this application, after completing one hole enlargement, if it is necessary to further expand the enlargement range of the expanding arm, it is not necessary to completely withdraw the reamer from the hole. Simply activate the telescopic mechanism to move the limit plate upwards, which in turn allows the moving part of the bottom support drill to continue moving upwards. This allows the extension arm to expand outwards again within the range of rotation of the support rod, thus continuing the hole-reaming operation. This greatly improves the efficiency of continued hole reaming, as the hole-reaming state can be adjusted without completely withdrawing the bottom drill from the hole. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0017] Figure 3 for Figure 2 A frontal view of the structure.

[0018] Among them, 1-limiting tube, 2-extension arm, 3-moving part, 4-abutting part, 5-support rod, 6-limiting plate, 7-telescopic mechanism, 8-threaded rod, 9-top truncated cone, 10-positioning plate, 11-drive tube, 12-arc plate, 13-connecting rib plate, 14-positioning block, 15-first drill bit, 16-second drill bit. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] 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., 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 utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Please refer to Figures 1 to 3 As shown, a reamer with convenient adjustable limits includes: A rotating box has a limiting tube 1 that extends through both ends. The two sides of the rotating box are open. Two extension arms 2 are hinged inside the rotating box and are symmetrically arranged about the limiting tube 1. The bottom support drill includes a movable part 3 that is slidably disposed in the limiting tube 1 and an abutting part 4 disposed at the bottom end of the movable part 3. The abutting part 4 is disposed below the limiting tube 1. Support rods 5 are respectively hinged to both sides of the abutting part 4, and the other end of the support rods 5 is hinged to the bottom side of the extension arm 2. The top limiting mechanism includes a telescopic mechanism 7 installed inside the limiting tube 1. The telescopic end of the telescopic mechanism 7 is set downward, and a limiting plate 6 is installed on the telescopic end of the telescopic mechanism 7. The outer wall of the limiting plate 6 is slidably abutting against the inner wall of the limiting tube 1.

[0026] Thus, when using a reamer to enlarge a hole, during the insertion of the reamer into the hole, the bottom support drill falls under its own weight. Under the action of the support rod 5, the limiting tube 1, and the moving part 3, combined with the pulling force of the abutment part 4, the extending arm 2 is in a retracted state, bringing its bottom end close to the outer wall of the limiting tube 1. As the bottom support drill descends, when its abutment part 4 contacts the bottom of the hole, it continuously presses down on the rotating box, causing the moving part 3 of the bottom support drill to move upward relative to the limiting tube 1. This allows the extending arms 2 on both sides to unfold under the action of the support rod 5, thus enlarging the hole. The limiting plate 6, located inside the limiting tube 1, restricts the upward movement of the moving part 3 relative to the limiting tube 1, thereby limiting the expansion distance of the extending arm 2. Using the reamer of this application, after completing one enlargement, if it is necessary to further expand the enlargement range of the extending arm 2, it is not necessary to completely withdraw the reamer from the hole. Simply activate the telescopic mechanism 7 to move the limiting plate 6 upwards, which in turn allows the moving part 3 of the bottom support drill to continue moving upwards. This allows the expanding arm 2 to continue expanding outwards within the range of rotation of the support rod 5, thus continuing the hole-reaming operation. This greatly improves the efficiency of continued hole-reaming, as the hole-reaming state can be adjusted without completely withdrawing the bottom drill from the hole.

[0027] Specifically, the telescopic mechanism 7 is a rotary motor. The rotating end of the rotary motor extends downward and is coaxially mounted with a threaded rod 8. The limiting plate 6 is mounted on the threaded rod 8, and the limiting plate 6 and the threaded rod 8 are connected by threads.

[0028] In this way, by simply starting the rotating motor, the forward and reverse rotation of the rotating motor can allow the limiting plate 6 to move up and down along the direction of the threaded rod 8 under the horizontal limiting action of the limiting tube 1.

[0029] Furthermore, in order to avoid the threaded rod 8 affecting the up-and-down movement of the moving part 3, the moving part 3 is a hollow structure with an open top, and the bottom end of the threaded rod 8 is directly opposite the open position at the top of the moving part 3.

[0030] In this way, even when the moving part 3 needs to be moved up to the plane above the bottom end of the threaded rod 8, the open position at the top of the moving part 3 can be used to allow the threaded rod 8 to be smoothly inserted into the moving part 3.

[0031] Furthermore, for the rotating box, the rotating box includes a top frustum 9, and two opposing positioning plates 10 are installed on the bottom surface of the top frustum 9. The limiting tube 1 and the extending arm 2 are both located between the two positioning plates 10. The top end of the extending arm 2 is hinged to the side wall of the positioning plate 10. The two outer walls of the limiting tube 1 are connected to the side wall of the positioning plate 10. A driving tube 11 is detachably installed on the top surface of the top frustum 9. The driving tube 11 is connected to the limiting tube 1 and is used for transmission connection with the rotating end of the external rotating mechanism.

[0032] Furthermore, a reinforcing mechanism is installed on the outer wall of the positioning plate 10. The reinforcing mechanism includes an arc-shaped plate 12 coaxially arranged with the top frustum 9. Several arc-shaped plates 12 are arranged sequentially along the axial direction of the top frustum 9, and adjacent arc-shaped plates 12 are connected by connecting ribs 13.

[0033] Specifically, the abutting part 4 includes a positioning block 14 connected to the bottom end of the limiting tube 1. The side wall of the positioning block 14 is hinged to the support rod 5, and a first drill bit 15 is installed on the bottom surface of the positioning block 14.

[0034] Furthermore, a second drill bit 16 is constructed on the side of the extended arm 2 opposite to the rotating box.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reamer with convenient adjustable limit, characterized in that, include: The rotating box has a limiting tube (1) that runs through both ends. The two sides of the rotating box are open. Two extension arms (2) are hinged inside the rotating box. The two extension arms (2) are symmetrically arranged about the limiting tube (1). The bottom support drill includes a movable part (3) that is slidably disposed in the limiting tube (1) and an abutting part (4) disposed at the bottom end of the movable part (3). The abutting part (4) is disposed below the limiting tube (1). Support rods (5) are respectively hinged to both sides of the abutting part (4). The other end of the support rods (5) is hinged to the bottom side of the extension arm (2). The top limiting mechanism includes a telescopic mechanism (7) installed inside the limiting tube (1). The telescopic end of the telescopic mechanism (7) is set downward, and a limiting plate (6) is installed on the telescopic end of the telescopic mechanism (7). The outer wall of the limiting plate (6) is slidably abutted against the inner wall of the limiting tube (1).

2. The reamer with convenient adjustable limit according to claim 1, characterized in that, The telescopic mechanism (7) is a rotary motor. The rotating end of the rotary motor extends downward and is coaxially mounted with a threaded rod (8). The limiting plate (6) is mounted on the threaded rod (8), and the limiting plate (6) and the threaded rod (8) are connected by threads.

3. A reamer drill with convenient adjustable limit according to claim 2, characterized in that, The movable part (3) is a hollow structure with an open top, and the bottom end of the threaded rod (8) is directly opposite the open position of the top of the movable part (3).

4. The reamer with convenient adjustable limit according to claim 1, characterized in that, The rotating box includes a top frustum (9), and two opposing positioning plates (10) are installed on the bottom surface of the top frustum (9). The limiting tube (1) and the extension arm (2) are both located between the two positioning plates (10). The top end of the extension arm (2) is hinged to the side wall of the positioning plate (10). The two outer walls of the limiting tube (1) are connected to the side wall of the positioning plate (10). A driving tube (11) is detachably installed on the top surface of the top frustum (9). The driving tube (11) is connected to the limiting tube (1). The driving tube (11) is used for transmission connection with the rotating end of the external rotating mechanism.

5. A reamer drill with convenient adjustable limit according to claim 4, characterized in that, The outer wall of the positioning plate (10) is equipped with a reinforcement mechanism, which includes an arc plate (12) coaxially arranged with the top frustum (9). Several arc plates (12) are arranged sequentially along the axial direction of the top frustum (9), and adjacent arc plates (12) are connected by connecting ribs (13).

6. A reamer with convenient adjustable limit according to claim 1, characterized in that, The abutting part (4) includes a positioning block (14) connected to the bottom end of the limiting tube (1). The side wall of the positioning block (14) is hinged to the support rod (5). A first drill bit (15) is installed on the bottom surface of the positioning block (14).

7. A reamer drill with convenient adjustable limit according to claim 1, characterized in that, The side of the extended arm (2) opposite to the rotating box is equipped with a second drill bit (16).

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