CN110857617A - Reducing drill bit and spiral drilling machine - Google Patents
Reducing drill bit and spiral drilling machine Download PDFInfo
- Publication number
- CN110857617A CN110857617A CN201810965611.8A CN201810965611A CN110857617A CN 110857617 A CN110857617 A CN 110857617A CN 201810965611 A CN201810965611 A CN 201810965611A CN 110857617 A CN110857617 A CN 110857617A
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- drill
- rod
- drill bit
- joint
- mounting seat
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a reducing drill bit, comprising: the telescopic mechanism comprises a first drill rod joint and a second drill rod joint, wherein the first drill rod joint is used for being installed on a drill rod of the drilling equipment, and the second drill rod joint is arranged in the first drill rod joint and can be telescopic along the axial direction of the first drill rod joint; a first tooth mounting seat mounted on an end of the second tool joint; a second tooth mount connected to the second tool joint; a connecting rod for connecting the first rod sub with the second tooth mount; the first drill tooth mounting seat and the second drill tooth mounting seat are respectively provided with drill teeth, the second drill tooth mounting seat is connected with the second drill rod joint and the connecting rod, and the connecting rod is connected with the first drill rod joint in an articulated mode, so that the diameter of the reducing drill bit can be adjusted under the telescopic action of the telescopic mechanism. The invention also provides a spiral drilling machine using the reducing drill bit.
Description
Technical Field
The invention relates to the field of high-speed railway roadbed maintenance equipment, in particular to a variable-diameter drill bit and a spiral drilling machine, and particularly relates to a variable-diameter drill bit and a spiral drilling machine for digging roadbed filling.
Background
In recent years, with the rapid development of high-speed railways, large-scale high-speed railways are built in China, and great convenience is brought to people for traveling. However, in the operation process of the high-speed railway, the roadbed of the high-speed railway has some disease problems. Particularly, a series of frost heaving problems can occur on culvert foundations of railway lines, and frost damages can also occur on the foundations in seasonal frozen soil areas. Therefore, the structure of the roadbed foundation is unstable, the railway traffic is seriously influenced, and potential safety hazards are brought to the operation of a high-speed railway. The high-speed railway subgrade bed filler may contain expansive substances, after the high-speed railway subgrade bed filler is operated for a period of time, the subgrade is improperly drained, and the filler is expanded when meeting water and the like to arch upwards, so that the normal operation of the railway is influenced.
At present, the defect control of the high-speed railway mainly comprises the steps of manually digging road base filler, replacing the road base filler and improving the quality of a roadbed. However, the interval and time of maintenance work of the high-speed railway are limited, and the efficiency of manual excavation is extremely low. In addition, railway roadbed bed top layer filler intensity is big for manual work is difficult to realize, thereby can produce a lot of extra work load, and the factor of safety of manual excavation is low, draws to dig the precision low, and the engineering volume is big. The drill bit structure of the common drilling equipment in the prior art is single, and most of the drill bits are welded on a drill rod, and the diameter of the drill bit is smaller than that of a casing pipe used for unearthing in the drilling process. As a result, casing advancement is difficult, thereby affecting the drilling efficiency of the drilling apparatus.
Therefore, the drilling machine equipment and the drill bit which can meet special construction operation of the high-speed railway subgrade, have the characteristics of simple operation, small engineering quantity, high safety coefficient, high efficiency and the like, and can adapt to various working conditions and be used for digging and excavating the roadbed filler are urgently needed.
Disclosure of Invention
In view of at least some of the above technical problems, the present invention is directed to a variable diameter drill bit, in which cutting elements are connected in an articulated manner, so that the diameter of the variable diameter drill bit can be adjusted to perform drilling construction for different situations. The reducing drill bit can reduce the recoil required by the drilling equipment during propelling. The diameter of the drill hole larger than that of the casing for unearthing can be drilled through the reducing drill bit, so that the propelling of the casing is facilitated, and the drilling construction efficiency is obviously improved.
The invention also provides a spiral drilling machine which uses the reducing drill bit. The spiral drilling machine can carry out continuous digging construction and can timely screw out broken fillers. The variable-diameter drill bit is convenient for the sleeve to be pushed in the construction process, so that the construction efficiency of the spiral drilling machine is greatly improved, and the spiral drilling machine has the advantages of high efficiency, low cost, small engineering quantity, good safety performance and the like.
To this end, according to a first aspect of the present invention, there is provided a reducing drill comprising: the telescopic mechanism comprises a first drill rod joint and a second drill rod joint, wherein the first drill rod joint is used for being installed on a drill rod of the drilling equipment, and the second drill rod joint is arranged in the first drill rod joint and can be telescopic along the axial direction of the first drill rod joint; a first tooth mounting seat mounted on an end of the second tool joint; the second drill tooth mounting seat is connected with the second drill rod joint, and the mounting axis of the second drill tooth mounting seat is perpendicular to that of the first drill tooth mounting seat; a connecting rod for connecting the first rod sub with the second tooth mount; the drill bit comprises a first drill tooth mounting seat, a second drill tooth mounting seat, a connecting rod, a first drill rod joint, a second drill rod joint, a connecting rod, a telescopic mechanism and a plurality of drill teeth, wherein the first drill tooth mounting seat and the second drill tooth mounting seat are respectively provided with a plurality of drill teeth which are uniformly arranged, the second drill tooth mounting seat is connected with the second drill rod joint and the connecting rod, and the connecting rod is connected with the first drill rod joint in a hinged mode, so that the diameter of the reducing drill bit can be adjusted under the telescopic.
In a preferred embodiment, the first drill rod union is configured as a cylinder, at one end of which a telescopic chamber is provided which extends axially inwards.
In a preferred embodiment, the second tool joint comprises a connection portion and a telescopic rod extending from the connection portion, the telescopic rod being mounted within a telescopic cavity of the first tool joint and being axially movable.
In a preferred embodiment, the first drill tooth mounting seat is arranged at the end of the connecting part, and the directions of the drill teeth on the first drill tooth mounting seat are arranged in a central antisymmetric mode.
In a preferred embodiment, the second tooth mounting block comprises two mounting brackets, and the two mounting brackets are connected with the connecting portion in a diametrically opposite manner.
In a preferred embodiment, the directions of the drill teeth on the two mounting brackets are arranged in a central antisymmetric manner.
In a preferred embodiment, the drill teeth on the first drill tooth mounting seat and the mounting bracket are uniformly spaced and are arranged at a distance of 20-40 mm.
In a preferred embodiment, the reducing range of the reducing drill bit is 250 mm and 600 mm.
According to a second aspect of the present invention, there is provided a screw drill comprising: a drill body including a drive train for providing drilling power; the drilling rod is arranged on the drilling machine main body and used for rotary tunneling, a spiral blade is arranged on the drilling rod, a sleeve is sleeved on the drilling rod, and the spiral blade and the sleeve are used for soil excavation; the reducing drill bit is arranged at the drilling end of the drill rod; the hydraulic power unit is used as a power source and an operation table for controlling the screw drill to work; the variable diameter drill bit can be automatically adjusted to the maximum diameter for drilling during drilling construction, and can reduce the diameter to withdraw from the sleeve during retraction.
In a preferred embodiment, the maximum diameter of the reducing bit is greater than the diameter of the casing.
Drawings
The invention will now be described with reference to the accompanying drawings.
Fig. 1 shows the structure of a variable diameter drill bit according to the present invention.
Fig. 2 shows a schematic structural view of a screw drill according to the present invention.
In the present application, the drawings are all schematic and are used only for illustrating the principles of the invention and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
Fig. 1 shows the structure of a variable diameter drill bit 100 according to the present invention. As shown in fig. 1, the reducing drill bit 100 includes a telescoping mechanism 110. The telescoping mechanism 110 includes a first pipe joint 120, the first pipe joint 120 being used to install the reducer drill bit 100 onto a drill pipe of a drilling apparatus. The first tool joint 120 is configured as a cylinder with a telescoping bore extending axially inward at one end of the cylinder. A second tool joint 130 is provided in the telescopic cavity, and the second tool joint 130 can perform telescopic movement along the axial direction of the first tool joint 120.
In this embodiment, the second tool joint 130 includes a connecting portion 131 and a telescopic rod 132 extending from the connecting portion 131, and the telescopic rod 132 is installed in a telescopic cavity of the first tool joint 120 and can perform an axial telescopic motion.
According to the present invention, a first tooth mounting seat 140 is provided at an end of the connection portion 131 of the second tool joint 130. As shown in fig. 1, the first tooth mounting block 140 is configured in a plate shape. The first tooth mounting seat 140 is provided at an end of the connection portion 131 and is provided in a diameter direction of the second tool joint 130. The first tooth mounting base 140 is provided with a plurality of drill teeth 170, the drill teeth are uniformly spaced on the first tooth mounting base 140, and the directions of the drill teeth 170 are in central antisymmetric distribution, that is, the directions of the diametrically opposite drill teeth 170 on the first tooth mounting base 140 are opposite. The arrangement of the drill teeth 170 is beneficial to the drilling and cutting of the variable diameter drill bit 100, the drilling performance of the variable diameter drill bit 100 is obviously enhanced, and the drilling efficiency of the variable diameter drill bit 100 is greatly improved.
In this embodiment, a second coupling mounting plate is provided radially outwardly of the coupling portion 131 of the second tool joint 130. In the embodiment shown in fig. 1, two second connection mounting plates are provided radially outside the connection portion 131, and the two second connection mounting plates and the first drill tooth mounting block 140 are provided perpendicular to each other.
According to the present invention, the variable diameter drill bit 100 further includes a second tooth mounting seat 150, and the mounting axis of the second tooth mounting seat 150 is perpendicular to the mounting axis of the first tooth mounting seat 140. As shown in fig. 1, the second tooth mounting seat 150 includes two mounting brackets 151, and the two mounting brackets 151 are connected to the connection portion 131 of the second tool joint 130 in diametrically opposite directions. One end of the mounting bracket 151 is connected to the second connection mounting plate on the connection portion 131 of the second tool joint 130. Meanwhile, a first coupling mounting plate is provided on an outer circumference of the first tool joint 120 to be diametrically opposite. The first pipe joint 120 is connected to a connection rod 160 through a first connection mounting plate. The other end of the second tooth mounting block 150 is connected to the first tool joint 120 by a connecting rod 160. A plurality of evenly spaced drill teeth 170 are also provided on the second drill tooth mounting seat 150, and the directions of the drill teeth 170 on the two mounting brackets 151 are in central anti-symmetric distribution, i.e. the directions of the drill teeth 170 on the two mounting brackets 151 which are diametrically opposite are opposite. The arrangement of the drill teeth 170 on the second drill tooth mounting seat 150 significantly improves the drilling performance of the variable diameter drill bit 100, and further improves the drilling efficiency of the variable diameter drill bit 100.
In the present embodiment, the first drill rod coupling 120 and the connecting rod 160, the second drill rod coupling 130 and the second drill bit mounting seat 150, and the second drill bit mounting seat 150 and the connecting rod 160 are all connected together in an articulated manner by pins. Therefore, under the telescopic action of the telescopic mechanism 110, the opening angle of the second tooth mounting seat 150 can be changed by the hinging action of the second tooth mounting seat 150 and the connecting rod 160, so that the diameter of the reducing drill bit 100 can be adjusted to perform drilling construction for different situations.
According to the reducing drill bit 100 of the present invention, the first coupling 120 and the connecting rod 160, the second coupling 130 and the second tooth mount 150, and the second tooth mount 150 and the connecting rod 160 of the reducing drill bit 100 are connected in an articulated manner by pins. So that the diameter of the reducing drill bit 100 can be adjusted through the telescopic mechanism 110 to perform drilling construction for different situations. In one embodiment, the reducing range of the reducing drill bit 100 is set to 250 mm and 600 mm. Meanwhile, a drill hole with a diameter larger than that of a casing for unearthing can be drilled through the variable-diameter drill bit 100, so that the propulsion of the casing is facilitated, the recoil required by the propulsion of drilling equipment is greatly reduced, and the drilling construction efficiency is remarkably improved.
Fig. 2 shows a schematic structural view of an auger 200 according to the present invention. As shown in fig. 2, the auger drill 200 includes a drill body. The drill body includes a base 220 for securing the auger 200 to the ground, on which a sliding guide 221 is provided. A positioning bracket 222 is provided at one end of the base 220. The auger 200 also includes an auger stem (not shown) for drilling operations and a casing 230 for unearthing. The positioning bracket 222 is used to position the support sleeve 230. In one embodiment, the sleeve 230 is made of steel material, and the length of the sleeve 230 is set to 1m, and is connected by male and female screw threads. A reducing bit 100 according to the present invention is installed at the drilling end of the auger stem. The inner hexagonal socket joint and the outer hexagonal socket joint are constructed at the two ends of the auger stem, the auger stem can be conveniently installed on the auger drilling machine 200 through the hexagonal socket joints, the reducing drill bit 100 can be conveniently installed on the auger stem, and the installation efficiency of the auger drilling machine 200 can be effectively improved.
In this embodiment, the auger stem is provided with a helical blade. The diameter of the helical blade is set slightly smaller than the diameter of the sleeve 230 and the effective length is set to be the same as the length of the sleeve 230. The helical blade is used for transmitting the bit pressure and the torque of the auger drill 200, screwing out the crushed filler, and has a certain positioning effect on the reducing drill bit 100. For this reason, the helical blade is disposed concentrically with the sleeve 230 during manufacturing to ensure smooth advancement of the sleeve 230 during construction. The maximum diameter of the reducing bit 100 is greater than the diameter of the casing so that the drilled hole has a diameter greater than that of the casing 230, thereby facilitating the propulsion of the casing 230, and the propulsion of the casing can be adjusted by adjusting the size of the diameter of the reducing bit 100. During drilling construction, the crushed filler can be screwed out in time under the action of the helical blade and the sleeve 230, so that the construction efficiency of the auger drill 200 is remarkably improved.
The drill body 210 also includes a drive train 240 for powering the auger drill 200 in accordance with the present invention. As shown in fig. 2, the drive train 240 is mounted on the sliding guide 221. During construction, the transmission system 240 can axially move on the sliding guide rail 221 to provide axial propelling force and rotary power for spiral drilling to the auger stem, thereby realizing rotary tunneling construction of the auger 200.
In this embodiment, the drive train 240 includes a powered electric motor 241, a speed reducer 242 for converting the rotational speed of the electric motor 241 to adjust the torque, a coupling 243 for connecting the auger stem, and a hydraulic ram 244 for providing propulsion to the auger stem. A top pipe soil discharging bin 245 is further arranged at the joint of the coupler 243 and the auger stem, and the top pipe soil discharging bin 245 is used for discharging crushed filler in the drilling process. In one embodiment, a variable speed motor 241 is used to drive a reducer 242 with a gear ratio of 100. In this way, different drilling rates and torques can be obtained to suit different soil qualities.
According to the invention, the transmission system 240 further comprises a sliding base 250. As shown in fig. 2, a slide mount 250 mounts the drive train 240 to the slide rail 221. Under the action of the hydraulic oil cylinder 244, the sliding base 250 can drive the transmission system 240 to move on the sliding guide rail 221, so that tunneling power is provided for the spiral drilling machine 200 to carry out drilling construction.
According to the invention, the diameter of the variable diameter drill bit 100 can be automatically adjusted, and during drilling construction, the variable diameter drill bit 100 can be automatically adjusted to the maximum diameter for tunneling. The maximum diameter of the reducer drill bit 100 is greater than the diameter of the casing 230 so that a borehole is drilled with a diameter greater than the diameter of the casing 230. Thereby, the pushing resistance of the casing 230 is greatly reduced, and the drilling efficiency of the auger 200 is remarkably improved. While retracting, the reducer drill bit 100 can be reduced in diameter to smoothly withdraw from the casing 230.
The invention also includes a hydraulic power unit (not shown) as a power source and an operator station (not shown) for control. The operator station includes an auger stem lever for controlling the operation of the auger stem and a cylinder lever for controlling the operation of hydraulic cylinder 244. The operation table is fixedly installed on the drilling machine main body 210, so that observation and operation during construction drilling are facilitated.
In the present embodiment, the maximum torque of the auger 200 is set to 10KN/m by the motor 241 and the tacho 242. The working stroke of hydraulic cylinder 244 was set to 1200mm, and the design thrust of hydraulic cylinder 244 was set to 20 t. The auger 200 is suitable for soft to medium hard water-free soil layers, such as clay layers, mudstone layers, roadbed graded broken stone layers and the like, and has strong applicability.
The auger drill 200 according to the present invention uses the variable diameter drill bit 100 such that the diameter of the drilled hole is greater than the diameter of the casing 230, thereby greatly reducing the pushing resistance of the casing 230 during the construction process and significantly improving the drilling efficiency of the auger drill 200. When retracting, the reducing drill bit 100 can reduce the diameter to smoothly withdraw from the casing 230, and the construction operation is simple and convenient. Simultaneously, this auger drilling machine 200 can draw in the construction of digging in succession to through the helical blade structure on the auger stem, and sleeve pipe 230 combined action, can in time screw out the filler after the breakage, effectively improved auger drilling machine's unearthing efficiency. The spiral drilling machine 200 adopts the hydraulic pump station to provide power, not only can provide enough power output for the spiral drilling machine 200, but also can protect the spiral drilling machine 200 when drilling is difficult, and effectively improves the safety performance of the spiral drilling machine 200. In addition, the spiral drilling machine 200 has strong adaptability, can be applied to special operation areas where manual work cannot be performed, and greatly reduces the construction workload and the construction cost of excavation of the high-speed railway roadbed filling. Therefore, the construction efficiency of the spiral drilling machine 200 is greatly improved, and the spiral drilling machine 200 has the advantages of high efficiency, low cost, small engineering quantity, good safety performance and the like.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A reducing drill bit (100), comprising:
a telescoping mechanism (110) comprising a first drill rod joint (120) for mounting to a drill rod of a drilling apparatus, and a second drill rod joint (130) disposed in the first drill rod joint and being telescopable in an axial direction of the first drill rod joint;
a first tooth mount (140) mounted on an end of the second slip joint;
a second tooth mounting seat (150) connected to the second tool joint, the second tooth mounting seat having a mounting axis perpendicular to the mounting axis of the first tooth mounting seat;
a connecting rod (160) for connecting the first rod sub with the second tooth mount;
the drill bit comprises a first drill tooth mounting seat, a second drill tooth mounting seat, a connecting rod, a first drill rod joint, a second drill rod joint, a telescopic mechanism and a plurality of drill teeth (170), wherein the first drill tooth mounting seat and the second drill tooth mounting seat are both provided with a plurality of drill teeth (170) which are uniformly arranged, the second drill tooth mounting seat is connected with the second drill rod joint and the connecting rod, and the connecting rod is connected with the first drill rod joint in a hinged mode, so that the diameter of the reducing drill bit can be adjusted under the telescopic action.
2. The reducing drill bit according to claim 1, wherein the first drill pipe joint is configured as a cylinder, and a telescoping cavity extending axially inward is provided at one end of the cylinder.
3. The reducing drill bit according to claim 2, wherein the second slip joint comprises a connecting portion (131) and a telescoping rod (132) extending from the connecting portion, the telescoping rod being mounted within a telescoping cavity of the first slip joint and being axially movable.
4. The reducing drill bit according to claim 3, wherein the first tooth mounting seat is arranged at the end of the connecting part, and the directions of the drill teeth on the first tooth mounting seat are arranged in a central antisymmetric manner.
5. The reducing drill bit of claim 4, wherein the second tooth mounting block comprises two mounting brackets, and the two mounting brackets are connected to the connecting portion in diametrically opposed relation.
6. The reducing drill bit according to claim 5, wherein the direction of the drill teeth on the two mounting brackets is arranged in a central antisymmetric manner.
7. The reducing drill bit according to claim 6, wherein the first tooth mounting seat and the teeth on the mounting bracket are uniformly spaced apart and the spacing is set to be 20-40 mm.
8. The variable diameter drill bit as claimed in any one of claims 1 to 7, wherein the variable diameter range of the variable diameter drill bit is 250 mm and 600 mm.
9. An auger drill (200), comprising:
a drill body (210) including a drive train (220) for providing drilling power;
the drilling rod is arranged on the drilling machine main body and used for rotary tunneling, a spiral blade is arranged on the drilling rod, a sleeve (230) is sleeved on the drilling rod, and the spiral blade and the sleeve are used for unearthing;
the reducing drill bit as claimed in any one of claims 1 to 8 disposed at a drilling end of the drill rod;
the hydraulic power unit is used as a power source and an operation table for controlling the screw drill to work;
the variable diameter drill bit can be automatically adjusted to the maximum diameter for drilling during drilling construction, and can reduce the diameter to withdraw from the sleeve during retraction.
10. The auger drill of claim 9, wherein the maximum diameter of the reducing bit is greater than the diameter of the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810965611.8A CN110857617A (en) | 2018-08-23 | 2018-08-23 | Reducing drill bit and spiral drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810965611.8A CN110857617A (en) | 2018-08-23 | 2018-08-23 | Reducing drill bit and spiral drilling machine |
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| Publication Number | Publication Date |
|---|---|
| CN110857617A true CN110857617A (en) | 2020-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810965611.8A Pending CN110857617A (en) | 2018-08-23 | 2018-08-23 | Reducing drill bit and spiral drilling machine |
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| Country | Link |
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| CN (1) | CN110857617A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111425145A (en) * | 2020-03-23 | 2020-07-17 | 中国五冶集团有限公司 | Drill bit device for pipe curtain construction |
| CN111441725A (en) * | 2020-05-16 | 2020-07-24 | 扬州市江隆矿业设备有限公司 | Reducing drill bit for nearly horizontal auger stem machine |
| CN112096293A (en) * | 2020-11-17 | 2020-12-18 | 胜利油田固邦石油装备有限责任公司 | Variable-diameter drill bit for oil field drilling |
| CN113586097A (en) * | 2021-09-01 | 2021-11-02 | 中煤地质集团有限公司中南分公司 | Construction method of vertical shaft pipe shed |
| CN113653448A (en) * | 2021-08-16 | 2021-11-16 | 任丘市锋锐钻头制造有限公司 | Drill bit and drill bit production equipment |
-
2018
- 2018-08-23 CN CN201810965611.8A patent/CN110857617A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111425145A (en) * | 2020-03-23 | 2020-07-17 | 中国五冶集团有限公司 | Drill bit device for pipe curtain construction |
| CN111441725A (en) * | 2020-05-16 | 2020-07-24 | 扬州市江隆矿业设备有限公司 | Reducing drill bit for nearly horizontal auger stem machine |
| CN111441725B (en) * | 2020-05-16 | 2021-08-10 | 扬州市江隆矿业设备有限公司 | Reducing drill bit for nearly horizontal auger stem machine |
| CN112096293A (en) * | 2020-11-17 | 2020-12-18 | 胜利油田固邦石油装备有限责任公司 | Variable-diameter drill bit for oil field drilling |
| CN112096293B (en) * | 2020-11-17 | 2021-02-09 | 胜利油田固邦石油装备有限责任公司 | Variable-diameter drill bit for oil field drilling |
| CN113653448A (en) * | 2021-08-16 | 2021-11-16 | 任丘市锋锐钻头制造有限公司 | Drill bit and drill bit production equipment |
| CN113653448B (en) * | 2021-08-16 | 2022-04-01 | 任丘市锋锐钻头制造有限公司 | Drill bit and drill bit production equipment |
| CN113586097A (en) * | 2021-09-01 | 2021-11-02 | 中煤地质集团有限公司中南分公司 | Construction method of vertical shaft pipe shed |
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