Driller of pneumatic hammer

Abstract

This invention relates to a pneumatic hammer reamer, comprising: a main drill bit, multiple auxiliary drill bits, multiple pins, and multiple pin retainers. The main drill bit has a main drilling section, multiple drill bit mounting spaces, and multiple pin insertion channels. Each auxiliary drill bit is mounted in a drill bit mounting space and is provided with an anti-interference groove. In addition, each pin can be inserted into the interior of the pin insertion channel, so that each pin passes through the anti-interference groove to prevent the auxiliary drill bit from separating from the main drill bit. Each retainer is disposed inside the pin insertion channel to individually contact the end of one of the pins. Thus, when the pneumatic hammer reamer is excavating in the foundation, the main drill bit will rotate and generate centrifugal force, causing the pins to move inside the pin insertion channels, so that the retainers will contact the end of the pins to prevent the pins from detaching from the pin insertion channels, thereby preventing the auxiliary drill bits from separating from the main drill bit.

Description

Technical Field

[0001] This invention relates to a pneumatic hammer reamer for excavating foundation piles, and in particular, a pneumatic hammer reamer that prevents the auxiliary drill bit from separating from the main drill bit when excavating foundations. Prior Technology

[0002] With the rapid development of urban construction, before building high-rise buildings, drilling rigs need to drill downwards to form pile holes. Then, piles are buried inside the pile holes to build a solid foundation, which can effectively prevent high-rise buildings from tilting and collapsing.

[0003] During the drilling process, construction workers will change to appropriate drill bits based on the hardness of the foundation material. This allows harder foundations to be drilled by drill bits with higher hardness, thus preventing drill bit damage and extending their service life. However, with the continuous advancement of technology, in order to enable drill bits to drill into hard foundations, fluid pressurization devices are added to the drill bits. This allows the drill bits to simultaneously spray pressurized fluids (such as pressurized water jets or pressurized air) into the foundation during drilling, enabling the drill bits to penetrate deeper into the foundation for drilling operations.

[0004] Please refer to Figure 1, which shows a conventional pneumatic hammer reamer 70 commonly found on the market. The conventional pneumatic hammer reamer 70 has a main drill bit 71, a plurality of auxiliary drill bits 72, and a plurality of pins 73. The plurality of auxiliary drill bits 72 are pivotally connected to the main drill bit 71, and each pin 73 passes through both the main drill bit 71 and one of the auxiliary drill bits 72. Two spring pins 74 are provided between each pin 73 and the main drill bit 71 to reduce the gap between the pin 73 and the main drill bit 71.

[0005] However, when the conventional pneumatic hammer reamer 70 is excavating a foundation, the main drill bit 71 rotates and generates centrifugal force. This centrifugal force acts on the pin 73, causing the pin 73 to move axially relative to the main drill bit 71. This increases the possibility that the pin 73 may detach from both the main drill bit 71 and the auxiliary drill bit 72. If the pin 73 detaches from both the main drill bit 71 and the auxiliary drill bit 72 during the excavation process, the auxiliary drill bit 72 will separate from the main drill bit 71, which will damage the structure of the conventional pneumatic hammer reamer 70 and reduce its service life. Summary of the Invention

[0006] The main objective of this invention is to improve the structural design of the pneumatic hammer reamer, so that when the improved pneumatic hammer reamer is excavating in the foundation, the pin can resist the centrifugal force generated by the rotation of the main drill bit. This allows the pin to be stably connected to the main drill bit and the auxiliary drill bit under the high-speed rotation of the pneumatic hammer reamer, thereby preventing the auxiliary drill bit from detaching from the main drill bit. This not only improves the excavation efficiency of the improved pneumatic hammer reamer, but also reduces the probability of structural damage when excavating the foundation.

[0007] To achieve the above objectives, the present invention provides a pneumatic hammer reamer, which includes a main drill bit, a plurality of auxiliary drill bits, a plurality of pins, and a plurality of retaining rings.

[0008] The main drill bit is provided with a main drilling section and a plurality of drill bit mounting spaces at the bottom. The main drill bit is surrounded by a plurality of pin insertion channels. Each of the pin insertion channels is connected one-to-one to one of the drill bit mounting spaces and is provided with a buckle groove.

[0009] Each of the aforementioned auxiliary drill bits is installed one-to-one in one of the aforementioned drill bit mounting spaces and is provided with a recess forming an anti-interference groove that can be aligned with the aforementioned pin insertion channel. Each of the aforementioned pins is inserted one-to-one into the aforementioned pin insertion channel, such that each of the aforementioned pins passes through the aforementioned anti-interference groove to prevent the aforementioned auxiliary drill bit from separating from the aforementioned main drill bit. In addition, each retainer has a deformable part located inside the aforementioned retainer groove and a stop part located inside the aforementioned pin insertion channel. The aforementioned stop part can be contacted by the aforementioned pin to prevent the aforementioned pin from separating from the aforementioned pin insertion channel.

[0010] In a preferred embodiment, the main drilling section and the auxiliary drilling section together form a drilling area, and the auxiliary drill bit can swing relative to the main drill bit, so that the auxiliary drill bit can protrude outward around the main drill bit to expand the drilling area.

[0011] Furthermore, the aforementioned pin insertion channel is divided into an inner insertion section and an outer insertion section through the aforementioned buckle groove. A portion of the aforementioned inner insertion section is used to accommodate the aforementioned pin, while the remaining portion of the aforementioned inner insertion section accommodates a buffer element that simultaneously contacts the aforementioned pin and the buckle, and the aforementioned buffer element can suppress the aforementioned pin from moving inside the aforementioned pin insertion channel.

[0012] The aforementioned buffer element is deformable, and the distance between the aforementioned pin and the buckle is set as an accommodating distance. The length of the aforementioned buffer element is greater than the aforementioned accommodating distance, so that when the aforementioned buffer element is located between the aforementioned pin and the buckle, the aforementioned pin and the buckle will jointly squeeze the aforementioned buffer element to cause the aforementioned buffer element to deform.

[0013] Furthermore, the outer penetration section of the aforementioned pin penetration channel is fitted with a dust cover, the dust cover having a penetration portion located inside the aforementioned outer penetration section and a cover portion located outside the aforementioned outer penetration section, and the outline of the cover portion is larger than the outline of the aforementioned penetration portion.

[0014] The invention is characterized in that when the deformable part of the retaining ring is connected to the retaining ring groove in the drill bit mounting space, both stop parts of the retaining ring are located inside the pin insertion channel in the drill bit mounting space so as to contact the end of the pin. In this way, when the pneumatic hammer reamer is digging in the foundation, the pin can contact the retaining ring to resist the centrifugal force generated by the rotation of the main drill bit. This allows the pin to be stably connected to the main drill bit and the auxiliary drill bit under the high-speed rotation of the pneumatic hammer reamer, thereby preventing the auxiliary drill bit from detaching from the main drill bit. This not only improves the digging efficiency of the improved pneumatic hammer reamer, but also reduces the probability of structural damage to the pneumatic hammer reamer when digging in the foundation. Simple Explanation of the Diagram

[0015] Figure 1 is a schematic diagram of a conventional pneumatic hammer reamer; Figure 2 is a perspective view of the pneumatic hammer reamer of the present invention in a first preferred embodiment; Figure 3 is an exploded view of the pneumatic hammer reamer of the present invention in the first preferred embodiment; Figure 4 is a partial exploded cross-sectional view of the pneumatic hammer reamer in the first preferred embodiment of the present invention; Figure 5A is a schematic diagram showing the auxiliary drill bit in its storage position; Figure 5B is a schematic diagram of the auxiliary drill bit located in the outward convex position; Figure 6 is a cross-sectional view of the buckle being disposed inside the buckle groove; Figure 7 is a schematic diagram of pneumatic hammer borehole drilling in the foundation; Figure 8 is a perspective view of the pneumatic hammer reamer of the present invention in a second preferred embodiment; Figure 9 is a partial exploded cross-sectional view of the pneumatic hammer reamer in the second preferred embodiment of the present invention; and Figure 10 is a partial cross-sectional view of the pneumatic hammer reamer in the second preferred embodiment of the present invention. Implementation

[0016] To facilitate a deeper and more detailed understanding of the structure, use, and features of the present invention, preferred embodiments are described below in conjunction with the accompanying drawings:

[0017] Please refer to Figures 2, 3, and 4. In the first preferred embodiment, the pneumatic hammer reamer 1 of the present invention mainly comprises a main drill bit 10, a plurality of auxiliary drill bits 20, a plurality of pins 30, and a plurality of retaining rings 40. The bottom of the main drill bit 10 is provided with a main drilling section 11 and a plurality of drill bit mounting spaces 12. Furthermore, a plurality of pin-through channels 13 are formed around the main drill bit. Each drill bit mounting space 12 is provided with a drill bit receiving recess 1 formed from the recess of the main drilling section 11. 21. A drill bit passage 122 recessed from the drill bit receiving recess 121 into the main drill bit 10, and a pin passage 13 connected to the drill bit passage 122. In this embodiment, the drill bit passage 122 is arranged longitudinally, and the pin passage 13 is arranged laterally, such that the drill bit passage 122 intersects with the pin passage 13, and the pin passage 13 is recessed at one end away from the drill bit passage 122 to form a retaining ring groove 14.

[0018] As shown in Figures 2 and 3, each auxiliary drill bit 20 has a drilling section 21 and a drill rod section 22. The drill rod section 22 is recessed to form an anti-interference groove 23. As shown, the drill rod section 22 passes through the drill bit insertion channel 122 of the main drill bit 10, such that the anti-interference groove 23 is aligned with the pin insertion channel 13 of the main drill bit 10. When the drill rod section 22 is inserted into the drill bit insertion channel 122, the auxiliary drilling section 21 is located at the drill bit retraction point of the main drill bit 10. The receiving recess 121 is located inside the drill bit passage 122, while the anti-interference groove 23 is located at the junction between the drill bit passage 122 and the pin passage 13. Furthermore, each pin 30 is inserted one-to-one into one of the pin passage 13 of the main drill bit 10, allowing each pin 30 to pass one-to-one through the drill bit receiving recess 121 of one of the auxiliary drill bits 20. This allows the pin 30 to simultaneously penetrate both the pin passage 13 and the anti-interference groove 23. In this embodiment, when the pin 30 is simultaneously inserted into both the pin passage 13 and the anti-interference groove 23, each auxiliary drill bit 20 is pivotally connected to the main drill bit 10, allowing each auxiliary drill bit 20 to swing relative to the main drill bit 10. During this swinging motion, each auxiliary drill bit 20 avoids colliding with the pin 30 through the anti-interference groove 23. As shown in Figures 5A and 5B, the main drilling section 11 of the main drill bit 10 and... The auxiliary drill bit 20 and its auxiliary drilling section 21 together form a drilling area A. The auxiliary drill bit 20 swings back and forth between a retracted position P1 and an outward convex position P2 relative to the main drill bit 10. When the auxiliary drill bit 20 is in the retracted position P1, the auxiliary drilling section 21 is located inside the drill bit retracting recess 121 of the main drill bit 10 to reduce the drilling area A. When the auxiliary drill bit 20 is in the outward convex position P2, the auxiliary drilling section 21 can protrude outward around the main drill bit 10 to expand the drilling area A.

[0019] Please refer to Figures 2, 3, 4 and 6. Each buckle 40 has two spaced-apart stop portions 41, and each buckle 40 has a deformable deformable portion 42 between the two stop portions 41. The deformable portion 42 is disposed inside the buckle groove 14, and the two stop portions 41 are located inside the pin passage 13 so as to contact the end of the pin 30.

[0020] Please refer to Figure 7, which shows the specific application of the pneumatic hammer reamer 1 in foundation excavation. When the main drill bit 10 rotates, it generates centrifugal force. Each pin 30 moves axially within the pin passage 13 of the main drill bit 10 due to the centrifugal force generated by the rotation of the main drill bit 10. The pin 30 can contact the retaining ring 40 to resist the centrifugal force generated by the rotation of the main drill bit 10. This allows the pin 30 to be stably connected to the main drill bit 10 and the auxiliary drill bit 20 under the high-speed rotation of the pneumatic hammer reamer 1, thereby preventing the auxiliary drill bit 20 from detaching from the main drill bit 10. This not only improves the excavation efficiency of the improved pneumatic hammer reamer 1, but also reduces the probability of structural damage when the pneumatic hammer reamer 1 is excavating foundations.

[0021] Please refer to Figures 8, 9, and 10. In the second preferred embodiment, the difference from the first preferred embodiment is that the pneumatic hammer reamer 1 further has a plurality of buffer elements 50 and a plurality of dust covers 60. Thus, in this embodiment, the pneumatic hammer reamer 1 mainly consists of a main drill bit 10, a plurality of auxiliary drill bits 20, a plurality of pins 30, a plurality of retaining rings 40, a plurality of buffer elements 50, and a plurality of dust covers 60. The pin passage 13 of the main drill bit 10 is divided into an inner passage section 131 and an outer passage section 132 through the retaining ring groove 14 of the main drill bit 10. Each inner passage section 131 has a pin 30 and a buffer element 50 installed inside, such that the inner passage section 131... A portion of the material is used to accommodate the pin 30, while the remaining portion of the inner through section 131 accommodates the buffer element 50, with both ends of the buffer element 50 contacting the pin 30 and the retaining ring 40 respectively, so that the buffer element 50 is located between the pin 30 and the retaining ring 40. The buffer element 50 is deformable, and the distance between the pin 30 and the retaining ring 40 is set as an accommodating distance D. The length of the buffer element 50 is greater than the accommodating distance D, so that when the buffer element 50 is located between the pin 30 and the retaining ring 40, the pin 30 and the retaining ring 40 will jointly squeeze the buffer element 50 to deform it. In this way, the buffer element 50 can suppress the movement of the pin 30 inside the pin through channel 13.

[0022] In addition, the dust cover 60 has a through portion 61 and a cover portion 62. The outline of the through portion 61 is smaller than that of the cover portion 62. The through portion 61 is inserted into the outer through portion 132 of the pin through channel 13, while the cover portion 62 is located outside the outer through portion 132, so that the dust cover 60 is installed on the outer through portion 132 to prevent dust from entering the interior of the pin through channel 13.

[0023] The embodiments described are for illustrative purposes only and are not intended to limit the invention. Various simple modifications and variations made without departing from the invention should still be included in the following patent application scope.

[0024] 1: Pneumatic hammer reamer 10: Main Drill Bit 11: Main Drilling Section 12: Drill bit installation space 121: Drill bit storage recess 122: Drill bit penetration channel 13: Passing through the pin channel 131: Internal tunnel section 132: Section with external crossing 14: Buckle groove 20: Secondary drill bit 21: Auxiliary Drilling Department 22: Drill bit rod section 23: Anti-interference groove 30: Pin 40: Buckle 41: Stop section 42: Deformation section 50: Buffer element 60: Dust cover 61: Penetration Department 62: Cover part A: Drilling area D: Accommodation Spacing P1: Storage Location P2: Outward convex position 70: Familiar with pneumatic hammer reamers 71: Main Drill Bit 72: Secondary drill bit 73: Pin 74: Spring pin

Claims

1. A pneumatic hammer reamer, comprising: a main drill bit having a main drilling section and a plurality of drill bit mounting spaces at its bottom, wherein the main drill bit is surrounded by a plurality of pin-through channels, each of the pin-through channels being connected one-to-one to one of the drill bit mounting spaces and having a retaining ring groove; a plurality of auxiliary drill bits, each of the auxiliary drill bits being mounted one-to-one to one of the drill bit mounting spaces and having a recess forming an anti-interference groove that can align with the pin-through channels; a plurality of pins, each of the pins being inserted one-to-one into the pin-through channels such that each pin passes through the anti-interference groove to prevent the auxiliary drill bits from separating from the main drill bit; and a plurality of retaining rings, each retaining ring having a deformable portion located inside the retaining ring groove and a stop portion located inside the pin-through channel, wherein the stop portion can be contacted by the pins to prevent the pins from separating from the pin-through channels.

2. The pneumatic hammer reamer as described in claim 1, wherein, The main drilling section and the auxiliary drilling section together form a drilling area, and the auxiliary drill bit can swing relative to the main drill bit, so that the auxiliary drill bit can protrude outward around the main drill bit to expand the drilling area.

3. The pneumatic hammer reamer as described in claim 1, wherein, The drill bit installation space is provided with a drill bit receiving recess formed from the recess of the main drilling section and a drill bit passing channel recessed from the drill bit receiving recess into the interior of the main drill bit. The drill bit passing channel is connected to the pin passing channel and is arranged intersectingly in the pin passing channel.

4. The pneumatic hammer reamer as described in claim 1, wherein, The aforementioned pin insertion channel is divided into an inner insertion section and an outer insertion section through the aforementioned buckle groove. A portion of the aforementioned inner insertion section is used to accommodate the aforementioned pin, while the remaining portion of the aforementioned inner insertion section accommodates a buffer element that simultaneously contacts the aforementioned pin and the buckle, and the aforementioned buffer element can suppress the movement of the aforementioned pin within the aforementioned pin insertion channel.

5. The pneumatic hammer reamer as described in claim 4, wherein, The aforementioned buffer element is deformable, and the distance between the aforementioned pin and the buckle is set as an accommodating distance. The length of the aforementioned buffer element is greater than the aforementioned accommodating distance, so that when the aforementioned buffer element is located between the aforementioned pin and the buckle, the aforementioned pin and the buckle will jointly squeeze the aforementioned buffer element to cause the aforementioned buffer element to deform.

6. The pneumatic hammer reamer as described in claim 4, wherein, The outer penetration section of the aforementioned pin penetration channel is fitted with a dust cover, the dust cover having a penetration portion located inside the aforementioned outer penetration section and a cover portion located outside the aforementioned outer penetration section, the outline of the cover portion being larger than the outline of the penetration portion.

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