Bottom expanding mechanism of drill bit

Abstract

The utility model discloses a base expanding mechanism of drill bit, including unit stretching mechanism, slide mechanism, oil cylinder and mount, wherein the unit stretching mechanism is provided with a plurality of, the unit stretching mechanism includes hobbing cutter mechanism, stretching arm and connecting rod, the one end of stretching arm is articulated with the mount respectively, the one end of connecting rod is articulated with slide mechanism, and the other end of connecting rod is articulated with slide mechanism. The hob mechanism is installed on the extending arm, a guide hole is formed in the fixing frame, the sliding mechanism is arranged on the guide hole in a sliding mode, and the oil cylinder is installed on the fixing frame and connected with the sliding mechanism. According to the utility model, the oil cylinder can drive the sliding mechanism to slide relative to the fixed frame, so that each unit stretching mechanism can stretch out together to carry out base expanding processing. Due to the fact that the unit stretching mechanisms can synchronously move along with the movement of the same sliding block, the stability of base expanding machining is guaranteed, the machining precision is high, the stretching amount of the unit stretching mechanisms and the base expanding size can be adjusted by adjusting the movement of the sliding mechanisms, and the flexibility is high.

Description

Technical Field

[0001] The utility model relates to the field of construction equipment processing, in particular to a bottom expansion mechanism of a drill bit. Background Art

[0002] In order to ensure that the foundation of the building is solid and stable, most buildings need to be equipped with piles. In order to facilitate the installation of piles on the land, drilling processing is naturally indispensable, and the realization of drilling often requires the use of a drill bit.

[0003] Conventional pile driving drills usually have similar cross-sectional sizes at various locations in the pile holes obtained after use. The center of gravity of the piles that can be installed on them is relatively high, and the bearing capacity and stability are relatively weak. In order to solve this problem, a bottom expansion mechanism is now used after drilling to increase the bottom cross-sectional size of the obtained pile hole.

[0004] At present, many bottom expanding mechanisms realize bottom expanding by directly driving multiple bottom expanding tools through multiple power sources. However, this method is difficult to ensure the synchronous movement of multiple bottom expanding tools, has poor stability, and easily leads to a large error between the obtained pile hole bottom size and the required pile hole size. Utility Model Content

[0005] The purpose of the utility model is to provide a bottom expansion mechanism for a drill bit, which can solve one or more of the above problems.

[0006] According to one aspect of the present invention, a bottom expansion mechanism for a drill bit is provided, comprising a unit extension mechanism, a sliding mechanism, an oil cylinder and a fixing frame.

[0007] There are multiple unit extension mechanisms, each comprising a hob mechanism, an extension arm, and a connecting rod. One end of each extension arm is hinged to a fixed frame, one end of each connecting rod is hinged to a sliding mechanism, and the other end is hinged to the extension arm. The hob mechanism is mounted on the extension arm.

[0008] The fixing frame is provided with a guide hole, the sliding mechanism is slidably arranged on the guide hole, and the oil cylinder is installed on the fixing frame and connected with the sliding mechanism.

[0009] The beneficial effects of the present invention are as follows: the oil cylinder drives the sliding mechanism and the fixed frame to slide relative to each other, and as the sliding mechanism moves, each unit extension mechanism is simultaneously extended to perform the bottom expansion process. Since each unit extension mechanism can move synchronously with the movement of the same slider, the stability of the bottom expansion process is ensured, the processing accuracy is high, and the extension amount of the unit extension mechanism can be adjusted by adjusting the movement of the sliding mechanism, thereby adjusting the bottom expansion size, and the flexibility is high.

[0010] In some embodiments, the roller mechanism includes a roller sleeve and a roller seat, the extension arm is provided with a bracket, the roller sleeve is rotatably mounted on the roller seat, and the roller sleeve is provided with a protrusion.

[0011] In some embodiments, the fixing frame is provided with a groove, a fixed shaft is provided in the groove, the extension arm is provided with a protrusion, the protrusion extends into the groove, and the protrusion is rotatably sleeved on the fixed shaft, thereby enabling the extension arm to rotate around the fixed shaft.

[0012] In some embodiments, two partitions are provided within the groove, forming a receiving cavity between the two partitions. The fixed shaft is provided with a protrusion, which is located within the receiving cavity. Thus, the partitions can effectively limit the position of the fixed shaft, effectively reducing the probability of the fixed shaft moving laterally or otherwise due to prolonged use.

[0013] In some embodiments, the sliding mechanism includes a sliding body, a connecting plate and a first hinge seat. The sliding body can be slidably arranged on the guide hole. There are multiple connecting plates and first hinge seats. Multiple connecting plates are connected to the sliding body. Multiple first hinge seats are respectively connected to multiple connecting plates. One end of the connecting rod of multiple unit extension mechanisms is respectively connected to multiple first hinge seats.

[0014] In some embodiments, the sliding mechanism includes a kit, which is sleeved on the sliding body, and a plurality of second hinges are provided on the kit. There are a plurality of oil cylinders, and the plurality of oil cylinders are hinged to the plurality of second hinges.

[0015] In some embodiments, the mounting bracket is connected to multiple cylinder mounts, each of which has a third hinge seat. The multiple cylinders are located within the multiple cylinder mounts and are hingedly connected to the third hinge seats within the multiple cylinder mounts. This allows for a certain amount of movement of the cylinders after installation, providing a certain degree of tolerance in their installation position and preventing damage to the cylinders during operation due to excessive installation rigidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a bottom expansion mechanism of a drill bit according to one embodiment of the present invention.

[0017] Figure 2 This is a structural schematic diagram of a bottom expansion mechanism of a drill bit according to one embodiment of the present invention.

[0018] Figure 3 This is a front view of a structural schematic diagram of a bottom expansion mechanism of a drill bit according to an embodiment of the present invention.

[0019] Figure 4This is a structural diagram of the combined extension arm and hob mechanism of the bottom expansion mechanism of a drill bit according to one embodiment of the present invention.

[0020] In the figure: 1. unit extension mechanism, 2. sliding mechanism, 3. cylinder, 4. fixing frame, 5. cylinder seat, 11. hob mechanism, 12. extension arm, 13. connecting rod, 111. roller sleeve, 112. hob seat, 21. sliding body, 22. connecting plate, 23. first hinge seat, 24. kit, 121. protrusion, 122. bracket, 123. bump, 41. groove, 411. fixed shaft, 412. partition, 413. bump, 241. second hinge seat, 51. third hinge seat. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings.

[0022] refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The utility model discloses a bottom expanding mechanism for a drill bit, comprising a unit extending mechanism 1, a sliding mechanism 2, a cylinder 3 and a fixing frame 4.

[0023] There can be multiple unit extension mechanisms 1. In this embodiment, there are preferably six unit extension mechanisms 1. Each unit extension mechanism 1 includes a hob mechanism 11, an extension arm 12 and a connecting rod 13.

[0024] Six grooves 41 are provided on the side of the fixing frame 4, and the six grooves 41 are evenly distributed on the side of the fixing frame 4. A fixed shaft 411 is provided in each groove 41, and the extension arm 12 on each unit extension mechanism 1 is provided with two protrusions 121. In the middle of each unit extension mechanism 1, the two protrusions 121 thereon extend into a groove 41, and the two protrusions 121 on each unit extension mechanism 1 can be rotatably mounted on a fixed shaft 411, so that the ends of the six extension arms 12 are respectively hinged to the six fixed shafts 411 of the fixing frame 4 in a one-to-one correspondence.

[0025] Two partitions 412 are further provided in each groove 41 , and an accommodating cavity is formed between the two partitions 412 . In the same groove 41 , a protrusion 413 is provided on the fixed shaft 411 , and the protrusion 413 is located in the accommodating cavity. That is, in the same groove 41 , the protrusion 413 is located between the two partitions 412 so as to be limited by the two partitions 412 .

[0026] The sliding mechanism 2 includes a sliding body 21, a connecting plate 22, and a first hinge seat 23. A guide hole is provided at the center of the fixed frame 4, and the sliding body 21 is slidably mounted on the guide hole. There can be multiple connecting plates 22 and first hinge seats 23, and their number is equivalent to the number of unit extension mechanisms 1, so each of the connecting plates 22 and first hinge seats 23 also has six.

[0027] The six connecting plates 22 are all connected to the sliding body 21 by welding and are evenly distributed around the side of the sliding body 21. The six first hinge seats 23 are fixedly connected to the six connecting plates 22 by bolts. One end of the connecting rod 13 of the six unit extension mechanisms 1 is hinged to the six first hinge seats 23 through a pin shaft, so that the end of the connecting rod 13 can move with the movement of the slider body 21.

[0028] The other ends of the six connecting rods 13 are hinged to the six extension arms 12 via pins, and multiple roller cutter mechanisms 11 are mounted on each extension arm 12. Specifically, the roller cutter mechanism 11 includes a roller sleeve 111 and a roller cutter seat 112. The extension arm 12 is provided with a bracket 122. The roller sleeve 111 is rotatably mounted on the roller seat 112. The roller sleeve 111 is provided with a protrusion 123.

[0029] The sliding mechanism 2 further includes a kit 24 , which is fixedly mounted on the sliding body 21 and is provided with a plurality of second hinges 241 . In this embodiment, there are preferably six second hinges 241 , and the six second hinges 241 are evenly distributed around the center of the kit 24 .

[0030] There can also be multiple cylinders 3, the number of which is equal to the number of second hinges 241. In this embodiment, there are preferably six cylinders 3. The piston rods of the six cylinders 3 are hinged to the six second hinges 241 through pins, so that the cylinders 3 are connected to the sliding mechanism 2.

[0031] The fixing frame 4 is also connected to multiple cylinder seats 5. The number of cylinder seats 5 is equivalent to the number of cylinders 3, and is preferably six. Each cylinder seat 5 is provided with a third hinge seat 51. The six cylinders 3 are respectively arranged in the six cylinder seats 5, and the bottom of the cylinder body of the six cylinders 3 is hinged to the third hinge seat 51 in the six cylinder seats 5 through a pin shaft, so that all cylinders 3 can be installed on the fixing frame 4.

[0032] When the bottom expansion mechanism of the drill bit is used for expanding the bottom of the pile hole, all the oil cylinders 3 can jointly drive the sliding body 21 to move, so that the sliding body 21 and the fixed frame 4 slide relative to each other. Then, as the sliding body 21 slides, each first hinge seat 23 connected to the sliding body 21 through the connecting plate 22 can move accordingly, and one end of the connecting rod 13 correspondingly connected to the first hinge seat 23 can also move accordingly. The movement of this end of the connecting rod 13 can drive the extension arm 12 to rotate around the fixed axis 411 and extend. At this time, the roller sleeve 111 of the roller mechanism 11 on the extended extension arm 12 can contact the side wall of the pile hole.

[0033] The bottom expansion mechanism of the drill bit can be rotated by an external motor or other power device, and the roller sleeve 111 can move with the rotation of the bottom expansion mechanism of the drill bit. At the same time, it can also roll on the side wall of the pile hole. The protrusions 123 on the roller sleeve 111 can dig the side wall of the pile hole to achieve pile hole bottom expansion.

[0034] In addition, the user can control the extension of the piston rod of the oil cylinder 3 to control the movement range of the sliding body 21, thereby controlling the extension of the extension arm 12 to achieve control of the size of the pile hole bottom expansion, which is highly flexible.

[0035] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A bottom expansion mechanism for a drill bit, characterized in that: Including unit extension mechanism, sliding mechanism, oil cylinder and fixed frame, There are multiple unit extension mechanisms, each comprising a hob mechanism, an extension arm, and a connecting rod. One end of each extension arm is hinged to a fixed frame, one end of each connecting rod is hinged to a sliding mechanism, and the other end is hinged to the extension arm. The hob mechanism is mounted on the extension arm. The fixing frame is provided with a guide hole, the sliding mechanism is slidably arranged on the guide hole, and the oil cylinder is installed on the fixing frame and connected with the sliding mechanism.

2. The bottom expansion mechanism of a drill bit according to claim 1, characterized in that: The roller mechanism comprises a roller sleeve and a roller seat. The extension arm is provided with a bracket. The roller sleeve is rotatably sleeved on the roller seat. The roller sleeve is provided with convex points.

3. The bottom expansion mechanism of a drill bit according to claim 1, characterized in that: The fixing frame is provided with a groove, a fixing shaft is provided in the groove, the extension arm is provided with a protrusion, the protrusion extends into the groove, and the protrusion is rotatably sleeved on the fixing shaft.

4. The bottom expansion mechanism of a drill bit according to claim 3, characterized in that: Two partitions are provided in the groove, an accommodating cavity is formed between the two partitions, a convex block is provided on the fixed shaft, and the convex block is located in the accommodating cavity.

5. The bottom expansion mechanism of a drill bit according to claim 1, characterized in that: The sliding mechanism includes a sliding body, a connecting plate and a first hinge seat. The sliding body can be slidably arranged on the guide hole. There are multiple connecting plates and first hinge seats. Multiple connecting plates are connected to the sliding body. Multiple first hinge seats are respectively connected to multiple connecting plates. One end of the connecting rod of multiple unit extension mechanisms is respectively connected to multiple first hinge seats.

6. The bottom expansion mechanism of a drill bit according to claim 5, characterized in that: The sliding mechanism includes a kit, which is sleeved on the sliding body. The kit is provided with a plurality of second hinge seats. There are a plurality of oil cylinders, and the plurality of oil cylinders are hinged to the plurality of second hinge seats.

7. The bottom expansion mechanism of a drill bit according to claim 6, characterized in that: The fixing frame is connected to a plurality of oil cylinder seats, a third hinge seat is provided in the oil cylinder seat, and the plurality of oil cylinders are separately arranged in the plurality of oil cylinder seats and are respectively hinged to the third hinge seats in the plurality of oil cylinder seats.

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