CN107575157B - Perforating machine capable of controlling perforating depth - Google Patents
Perforating machine capable of controlling perforating depth Download PDFInfo
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- CN107575157B CN107575157B CN201710848097.5A CN201710848097A CN107575157B CN 107575157 B CN107575157 B CN 107575157B CN 201710848097 A CN201710848097 A CN 201710848097A CN 107575157 B CN107575157 B CN 107575157B
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- regulating device
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- depth
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 63
- 238000004080 punching Methods 0.000 claims abstract description 51
- 230000001276 controlling effect Effects 0.000 claims abstract description 26
- 238000005553 drilling Methods 0.000 claims description 18
- 239000010410 layer Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 10
- 230000033228 biological regulation Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Drilling And Boring (AREA)
Abstract
The invention relates to a perforating machine capable of controlling perforating depth, which comprises a power device, a speed regulating device, a hand support, an operating handle, a drill rod and a braking part, wherein the speed regulating device is arranged on the hand support; the output end of the power device is connected with the input end of the speed regulating device, the outer side wall of the speed regulating device is fixedly connected with the hand support, the output end of the speed regulating device penetrates into the hand support, the operating handle is fixedly connected with the hand support, the top end of the drill rod is detachably connected with the output end of the speed regulating device, and the braking part is detachably connected with the drill rod. According to the puncher capable of controlling the punching depth, the braking part is connected to the drill rod, when the punching depth is fixed, the braking part limits the drill rod to continue to rotate, and the purpose of controlling the punching depth is achieved, so that the depth of a hole is not required to be measured manually for multiple times in the operation process, labor is saved, and punching efficiency is improved.
Description
Technical Field
The invention relates to the technical field of perforating machines, in particular to a perforating machine capable of controlling perforating depth.
Background
The perforating machine is widely applied to tree planting, garden construction, ice hole drilling, building construction and the like; the perforating machine has high drilling efficiency, reduces labor intensity of workers, saves time and labor, and is a reason that the perforating machine is favored by people.
However, the existing puncher cannot control the punching depth, and if the punching depth is required, the depth of the hole needs to be measured frequently in the punching process so as to reach the hole with the required specified depth; repeated measurement not only increases the punching time length, but also increases the extra work of workers, increases the labor intensity of the workers, and further reduces the punching work efficiency.
Therefore, how to provide a punch with controllable punching depth is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a puncher capable of controlling the punching depth, which can shorten the drilling time by controlling the punching depth of the drilling hole, reduce the labor intensity of workers and further improve the drilling efficiency.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the puncher capable of controlling the punching depth comprises a power device, a speed regulating device, a hand support, an operating handle, a drill rod and a braking part; the output end of the power device is connected with the input end of the speed regulating device, the outer side wall of the speed regulating device is fixedly connected with the hand support, the output end of the speed regulating device penetrates into the hand support, the operating handle is fixedly connected with the hand support, the top end of the drill rod is detachably connected with the output end of the speed regulating device, and the braking part is detachably connected with the drill rod.
Preferably, the drill rod comprises a drill rod body, a cutting edge; the drill rod body is connected with a cutting edge, the cutting edge surrounds the drill rod body in a spiral mode, a fixing hole and scale marks are formed in the drill rod body, the fixing hole is provided with a plurality of scale marks, and the scale marks are arranged corresponding to the fixing hole.
Preferably, the scale value range corresponding to the plurality of groups of scale marks is 0-1m, and the minimum scale value is accurate to 0.01m.
Preferably, the braking member includes: the device comprises a fixed buckle, a tension spring, a connecting piece, a brake block and a clamping spring; the fixed buckle is welded at one end of the tension spring, the other end of the tension spring is connected to the two brake blocks through the connecting piece, and the clamping spring is welded between the two brake blocks; the fixing buckle is correspondingly matched with the fixing hole, and the two brake blocks are clamped on the cutting edge corresponding to the fixing position of the fixing buckle. .
Preferably, the contact surface of the two brake plates with the blade is provided with a wear-resistant layer.
Preferably, the operation handles are arranged in two and symmetrically arranged on the hand support.
Preferably, the drill rod is made of steel material.
Preferably, the power means is an electric motor or an engine.
Preferably, the power device adopts an engine, and the speed regulating device comprises an input shaft, a plurality of groups of speed regulating gears and an output shaft; one end of the input shaft is connected with the power device, the other end of the input shaft is connected with the speed regulating gear, the speed regulating gear consists of a large gear and a small gear, one end of the output shaft is connected with the speed regulating gear, and the other end of the output shaft is detachably connected with the top of the drill rod;
the power device adopts the motor, and then speed adjusting device includes speed adjusting body, speed adjusting switch and pressure regulating device, is provided with the speed governing pole in the speed adjusting body, and speed adjusting pole one end is connected the drilling rod top, and the motor is connected to the speed adjusting pole other end, and speed adjusting switch sets up on speed adjusting body or motor casing, and pressure regulating device one end electric connection speed adjusting switch, other end electric connection motor.
Preferably, the surface of the operating handle is provided with a protective layer.
Compared with the prior art, the invention discloses the puncher capable of controlling the punching depth, and firstly, the braking component is connected to the drill rod, when the drilling rod reaches a fixed depth, the braking component limits the drill rod to continue rotating, and the purpose of controlling the punching depth is achieved, so that the depth of a hole is not required to be measured manually for multiple times in the operation process, labor is saved, and punching efficiency is improved.
Secondly, the power device of the puncher capable of controlling the punching depth provided by the invention realizes the adjustable rotating speed through the speed regulating device, and can regulate the rotating speed of the drill rod according to the punching process requirement, so that the puncher is high in practicability and can meet the use requirement of a user.
Finally, the perforating machine with controllable perforating depth provided by the invention has the advantages that the motor or the engine can be arranged on the power device, the perforating machine matched with the motor is selected in the perforating operation when the power supply is convenient to connect, and the perforating machine matched with the engine is selected in the outdoor operation or the place inconvenient to connect with the power supply, so that the application range is wide.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the whole structure of a punch with controllable punching depth according to the present invention;
FIG. 2 is a schematic structural view of a braking component of a punch with controllable punching depth according to the present invention;
FIG. 3 is a schematic view of a partially enlarged (blade not shown) structure of a drill rod of a hole puncher capable of controlling the depth of punching according to the present invention;
fig. 4 is a schematic structural view of an embodiment of a clamping spring for a punch capable of controlling the punching depth according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a perforating machine capable of controlling the perforating depth, which shortens the drilling time by controlling the perforating depth of a drilling hole, reduces the labor intensity of workers and further improves the drilling efficiency.
The invention provides a perforating machine capable of controlling the perforating depth, which is shown in figure 1, and specifically comprises a power device 1, a speed regulating device 6, a hand support 3, an operating handle 2, a drill rod 4 and a braking part 5; the output end of the power device 1 is connected with the input end of the speed regulating device 6, the outer side wall of the speed regulating device 6 is fixedly connected with the hand support 3, the output end of the speed regulating device penetrates into the hand support 3, the operating handle 2 is fixedly connected with the hand support 3, the top end of the drill rod 4 is detachably connected with the output end of the speed regulating device 6, and the braking part 5 is detachably connected with the drill rod 4.
According to the puncher capable of controlling the punching depth, the braking part 5 is connected to the drill rod 4, when the punching with the fixed depth is achieved, the braking part 5 limits the drill rod 4 to continue rotating, the purpose of controlling the punching depth is achieved, therefore, the depth of a hole is not required to be measured manually for multiple times in the operation process, labor is saved, and meanwhile punching efficiency is improved.
Advantageously, the drill rod 4 comprises a drill rod body 43, a cutting edge 42; the drill rod body 43 is connected with a cutting edge 42, the cutting edge 42 surrounds the drill rod body 43 in a spiral manner, the drill rod body 43 is provided with a fixed hole 41 and scale marks 44, the fixed hole 41 is provided with a plurality of scale marks 44, and the scale marks 44 are arranged corresponding to the positions of the fixed hole pairs 41; the drill rod 4 provided by the invention can be integrally connected with the drill rod body 43 and the cutting edge 42, and the diameter of the drill rod can be multiple, so that the requirements of drilling holes with different diameters and depths can be met.
Optionally, the blade 42 is connected with the drill rod body 43 by a bottom-up screw to form an adjustable angle, so that punching at different angles can be realized, chips can be discharged rapidly, and the punching efficiency is further improved.
Advantageously, the sets of scale markings 44 correspond to a scale value ranging from 0-1m, with a minimum scale value of 0.01m; the scale marks 44 are engraved on the drill rod body 43 or sprayed on the drill rod body 43, so that a target hole depth value is set in the actual punching process.
The present invention provides a puncher capable of controlling punching depth, a braking part 5 comprises: a holder buckle 51, a tension spring 52, a connecting member 55, a brake pad 53 and a clamping spring 54; the fixed buckle 51 is welded at one end of the tension spring 52, the other end of the tension spring 52 is connected to the brake plate 53 through the connecting piece 55, the number of the brake plate 53 is two, and the clamping spring 54 is welded between the two brake plates 53; the brake member 5 is provided to facilitate control of the depth of perforation.
The tension springs 52 are made of stainless steel or carbon steel, and tension springs with different diameters, lengths and turns are selected according to actual operation requirements of the puncher; the clamping spring 54 may be a torsion spring, the specific parameters of which are adapted to the application.
The clamping spring 54 may also be a self-made spring, see fig. 4, where two ends of the self-made spring are welded to the two brake pads 53 respectively, and a clip 542 is provided on the spring body 541, and a bayonet of the clip 542 faces the inner side of the space formed by the two brake pads 53.
Advantageously, the fixing button 51 is correspondingly matched with the fixing hole 41, wherein the fixing button 51 selects the fixing hole 41 corresponding to the scale value according to the actual required size; the two brake blocks 53 are clamped on the corresponding cutting edges 42 at the fixed positions of the fixed buckles 51; the brake part 5 is detachably connected with the drill rod 4, and the operation is convenient. Alternatively, a piece of brake pad 53 is secured to one side of blade 42 and then clamps the blade by clamp 542.
The fixing buckle 51 may be provided in a shape of a circle, a rectangle, a wedge, etc., the shape of the fixing hole 41 is matched with the shape of the fixing buckle 51, and the fixing buckle 51 may have a certain magnetism to prevent the foreign debris from interfering with the fixing of the fixing buckle 51 and the fixing hole 41.
The positions of the fixing holes 51 corresponding to the scale marks 44 are different according to the specific application places, the fixing holes 51 are arranged on integer unit values (0.1 m, 0.2m, and so on) of the scale marks 44, and the puncher for the indoor punching operation can be arranged on integer positions (0.1 m, 0.2m, and so on) of the scales or on intermediate values (0.05 m, 0.15m, and so on).
More advantageously, the contact surface of the two braking pieces 53 with the blade 42 is provided with a wear-resistant layer; the wear-resistant layer may be a metal wear-resistant layer plated on the brake plate or an adhered rubber elastic pad or a magnetic material arranged on the inner side of the brake plate 53 to assist in clamping the blade 42, so as to play a role in wear resistance, buffering or auxiliary fixation.
The invention provides a puncher capable of controlling punching depth, wherein a drill rod 4 is made of steel materials; the drill rod body 43 is made of 45Mn2 or 36Mn2v, and the cutting edge 42 is made of high-quality alloy steel.
The invention provides a perforating machine capable of controlling perforating depth, wherein a power device 1 is a motor or an engine; the motor-driven puncher can be selected in the place convenient to connect the power supply, and the engine-driven puncher can be selected in the field operation inconvenient to connect the power supply, wherein the engine refers to the gasoline engine, tail gas purification device and silencing device are also arranged on the gasoline engine, and pollution and noise pollution caused by punching operation to the surrounding environment are reduced.
The invention provides a perforating machine capable of controlling perforating depth, if a power device adopts a gasoline engine, a speed regulating device 6 comprises an input shaft, a plurality of groups of speed regulating gears and an output shaft; one end of the input shaft is connected with the engine, the other end of the input shaft is connected with the speed regulating gear, the speed regulating gear consists of a large gear and a small gear, one end of the output shaft is connected with the speed regulating gear, and the other end of the output shaft is detachably connected with the top of the drill rod 4; wherein, the output shaft is fixed through the locating pin with drilling rod 4, the drilling rod 4 of the different specifications of quick replacement of being convenient for.
If the power device adopts a motor, the speed regulating device 6 comprises a speed regulating body, a speed regulating switch and a pressure regulating device, a speed regulating rod is arranged in the speed regulating body, one end of the speed regulating rod is connected with the top of the drill rod 4, the other end of the speed regulating rod is connected with the motor, the speed regulating switch is arranged on the speed regulating body or the motor shell, one end of the pressure regulating device is electrically connected with the speed regulating switch, and the other end of the pressure regulating device is electrically connected with the motor; when in use, the speed regulating switch can be rotated or pressed to realize the regulation of different rotation speeds of the drill rod 4.
According to the puncher capable of controlling punching depth, provided by the invention, the surfaces of the operating handles 2 are painted, rust is prevented, and the two operating handles 2 are U-shaped, so that the puncher is convenient for a single person to operate with both hands.
The working principle of the puncher capable of controlling punching depth provided by the invention is as follows:
if the power device 1 of the puncher adopts a gasoline engine, firstly, the fixing buckle 51 is arranged in the fixing hole 41 corresponding to the scale size according to the required punching depth, the cutting edge 42 corresponding to the scale position is clamped by the two braking pieces 53 or one braking piece 53 is fixed on one side of the cutting edge 42, and then the cutting edge 42 is clamped by the clamp 542; when the gasoline engine is started, the output end of the gasoline engine drives the input shaft of the speed regulating device 6, the input shaft is transmitted to the output shaft through the speed regulating gear to drive the drill rod 4 to rotate, when the preset punching depth is reached, the cutting edge 42 at the corresponding position is blocked by the brake piece 53 (the clamping spring 54 with the clamp 542 structure is closed when the target punching depth is reached, the other brake piece 53 is further clamped to the cutting edge 42), so that the cutting edge 42 cannot continue to operate, the drill rod 43 stops rotating, and the punching depth can be controlled. In the punching process, the rotating speed of the gasoline engine can be changed to realize the low speed or high speed of the speed regulating device 6 so as to adapt to the actual working operation requirement.
If the motor is adopted in the power device 1 of the puncher, firstly, the fixing buckle 51 is arranged in the fixing hole 41 corresponding to the scale size according to the required punching depth, the cutting edge 42 corresponding to the scale position is clamped by the two braking pieces 53 or one braking piece 53 is fixed on one side of the cutting edge 42, and then the cutting edge 42 is clamped by the clamp 542; when the motor is electrified to drive the speed regulating rod to rotate, the speed regulating rod drives the drill rod 4 to rotate together, and when the preset drilling depth is reached, the cutting edge 42 at the corresponding position is blocked by the brake piece 53 (the clamping spring 54 with the clamp 542 structure is closed, and when the target drilling depth is reached, the other brake piece 53 is further clamped to the cutting edge 42), so that the cutting edge 42 cannot continue to operate, and the drill rod 43 stops rotating, namely the drilling depth is controllable. In the punching process, the speed regulating switch can be rotated or pressed according to actual demands, speed change of the speed regulating rod is realized through the speed regulating device, and then the drill rod 4 is driven to realize different rotation speed regulation.
In summary, the puncher with controllable punching depth provided by the invention not only can realize controllable punching depth, but also can realize adjustable revolving speed of the puncher.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The puncher capable of controlling the punching depth is characterized by comprising a power device (1), a speed regulating device (6), a hand support (3), an operating handle (2), a drill rod (4) and a braking part (5); the output end of the power device (1) is connected with the input end of the speed regulating device (6), the outer side wall of the speed regulating device (6) is fixedly connected with the hand support (3), and the output end of the speed regulating device penetrates into the hand support (3); the operating handle (2) is fixedly connected with the hand support (3), the top end of the drill rod (4) is detachably connected with the output end of the speed regulating device (6), and the braking part (5) is detachably connected with the drill rod (4);
the drill rod (4) comprises a drill rod body (43) and a cutting edge (42), the drill rod body (43) is connected with the cutting edge (42), the cutting edge (42) surrounds the drill rod body (43) in a spiral mode, a fixing hole (41) and scale marks (44) are formed in the drill rod body (43), a plurality of fixing holes (41) are formed, and the scale marks (44) are arranged corresponding to the fixing holes (41);
the braking member (5) comprises: the fixing buckle (51), the tension spring (52), the connecting piece (55), the brake block (53) and the clamping spring (54); the fixed buckle (51) is welded at one end of the tension spring (52), the other end of the tension spring (52) is connected to the brake block (53) through a connecting piece (55), the number of the brake block (53) is two, and the clamping spring (54) is welded between the two brake blocks (53); the fixing buckle (51) is correspondingly matched with the fixing hole (41); the two brake blocks (53) are clamped on the cutting edge (42) corresponding to the fixed position of the fixed buckle (51);
the clamping springs (54) are self-made springs, two ends of each self-made spring are welded on two braking pieces (53) respectively, clamps (542) are arranged on the spring main body (541), and the clamping openings of the clamps (542) face to the inner sides of spaces formed by the two braking pieces (53).
2. A punch with controllable punching depth according to claim 1, characterized in that the scale mark (44) corresponds to a scale value range of 0-1m, the smallest scale value being accurate to 0.01m.
3. A punch with controllable punching depth according to claim 1, characterized in that the two brake pads (53) are provided with wear layers on their contact surfaces with the cutting edge (42).
4. A punch with controllable punching depth according to any one of claims 1-3, characterized in that the operating handles (2) are arranged in two and symmetrically arranged on the hand support (3).
5. A controllable drilling machine according to any one of claims 1-3, characterized in that the drill rod (4) is made of steel material.
6. A punch with controllable punching depth according to any of the claims 1-3, characterized in that the power device (1) is an electric motor or an engine.
7. The hole puncher capable of controlling the hole punching depth according to claim 6, wherein the power device (1) adopts an engine, and the speed regulating device (6) comprises an input shaft, a plurality of groups of speed regulating gears and an output shaft; one end of the input shaft is connected with the engine, the other end of the input shaft is connected with the speed regulating gear, the speed regulating gear consists of a large gear and a small gear, one end of the output shaft is connected with the speed regulating gear, and the other end of the output shaft is detachably connected with the top of the drill rod (4);
or the power device (1) adopts the motor, then speed adjusting device (6) include speed adjusting body, speed adjusting switch and pressure regulating device, be provided with the speed adjusting pole in the speed adjusting body speed adjusting pole one end can dismantle and connect drilling rod (4) top, the speed adjusting pole other end is connected the motor, the speed adjusting switch set up in the speed adjusting body or on the motor casing, pressure regulating device one end electric connection speed adjusting switch, the other end electric connection the motor.
8. A punch with controllable punching depth according to claim 7, characterized in that the surface of the operating handle (2) is provided with a protective layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710848097.5A CN107575157B (en) | 2017-09-19 | 2017-09-19 | Perforating machine capable of controlling perforating depth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710848097.5A CN107575157B (en) | 2017-09-19 | 2017-09-19 | Perforating machine capable of controlling perforating depth |
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| Publication Number | Publication Date |
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| CN107575157A CN107575157A (en) | 2018-01-12 |
| CN107575157B true CN107575157B (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710848097.5A Active CN107575157B (en) | 2017-09-19 | 2017-09-19 | Perforating machine capable of controlling perforating depth |
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| CN (1) | CN107575157B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108496473A (en) * | 2018-03-19 | 2018-09-07 | 浙江名将液滤科技有限公司 | A kind of portable pit-picker |
| CN109571636B (en) * | 2018-12-12 | 2021-04-13 | 上海空间推进研究所 | Thermal control multilayer puncher for spacecraft |
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| CN201633093U (en) * | 2010-01-13 | 2010-11-17 | 陆坚 | Drill bit with depth positioner |
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| CN103331656A (en) * | 2012-10-21 | 2013-10-02 | 泰州市利优精密机械有限公司 | Drilling bit grinder |
| CN203541628U (en) * | 2013-09-23 | 2014-04-16 | 南车青岛四方机车车辆股份有限公司 | Drilling limiting device |
| CN203565899U (en) * | 2013-08-01 | 2014-04-30 | 张辉剑 | Electric driller |
| CN104160808A (en) * | 2014-08-21 | 2014-11-26 | 成都惠丰生态农业科技有限公司 | Small-size earth boring machine for fruit tree planting |
| CN204616321U (en) * | 2015-05-20 | 2015-09-09 | 刘庆国 | There is the gardens tree planting puncher of warning device |
| CN105312901A (en) * | 2014-05-30 | 2016-02-10 | 廖鑫 | Drilling and cutting integrated machine and machining method thereof |
| CN207177724U (en) * | 2017-09-19 | 2018-04-03 | 山西省农业科学院作物科学研究所 | A kind of puncher of controllable punching depth |
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- 2017-09-19 CN CN201710848097.5A patent/CN107575157B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201633093U (en) * | 2010-01-13 | 2010-11-17 | 陆坚 | Drill bit with depth positioner |
| CN103331656A (en) * | 2012-10-21 | 2013-10-02 | 泰州市利优精密机械有限公司 | Drilling bit grinder |
| CN203181527U (en) * | 2013-04-15 | 2013-09-11 | 冯国雄 | Perforating machine for plant cultivation |
| CN203565899U (en) * | 2013-08-01 | 2014-04-30 | 张辉剑 | Electric driller |
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| CN107575157A (en) | 2018-01-12 |
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