CN109604664A - A kind of drilling machine - Google Patents
A kind of drilling machine Download PDFInfo
- Publication number
- CN109604664A CN109604664A CN201811544549.1A CN201811544549A CN109604664A CN 109604664 A CN109604664 A CN 109604664A CN 201811544549 A CN201811544549 A CN 201811544549A CN 109604664 A CN109604664 A CN 109604664A
- Authority
- CN
- China
- Prior art keywords
- workbench
- drilling machine
- pedestal
- magneto
- machine according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B39/00—General-purpose boring or drilling machines or devices; Sets of boring and/or drilling machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B47/00—Constructional features of components specially designed for boring or drilling machines; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/0032—Arrangements for preventing or isolating vibrations in parts of the machine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/0078—Safety devices protecting the operator, e.g. against accident or noise
- B23Q11/0096—Safety devices protecting the operator, e.g. against accident or noise protecting against noise
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/08—Protective coverings for parts of machine tools; Splash guards
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention belongs to field of mechanical technique, refer in particular to a kind of drilling machine, include: drill bit, the main shaft for being set to above drill bit and drill bit being driven to rotate, head frame, be rotatably arranged on a rotating disc for frame side, the belt wheel being arranged on head frame, pedestal, the support column being set on the base, be arranged connecting flange on the support columns, workbench, workbench side be set and the rotation rocker arm that workbench slides on the support columns can be controlled, the rotation rocker arm is flexibly connected with Drilling machines bench；Head frame side is provided with a magneto with frequency conversion function, the output shaft of the magneto is connected with the belt wheel, the magneto side is provided with a frequency converter, and it is connected with each other by conducting wire, the frequency converter is mounted on a frame, several are provided on the frequency converter for adjusting the speed and the control device of start and stop.The object of the present invention is to provide a kind of stable structure, there is stepless time adjustment, drilling machine with long service life.
Description
Technical field
The invention belongs to field of mechanical technique, refer in particular to a kind of drilling machine.
Background technique
Currently, what drilling machine was adjusted the speed generally by multi-stage, belt wheel.Due to the feature in structure, existing drilling machine tune
It is fast inconvenient.When speed regulation, belt hub cap need to be removed, adjusts the position of belt.The rotating ratio adjustable range of drilling machine is small, generally exists
Within 1:10.For step speed regulation, the drilling machine optimum speed required when drilling cutting cannot be obtained.Drilling machine rotating ratio is bigger, skin
Pulley diameters are bigger, this just increases the volume of drilling machine.When supply voltage shakiness or the influence of external force or workpiece
When material hardness is irregular, drilling machine rotary speed unstabilization will be made, influence cutting quality.The efficiency of the production of enterprise is leveraged in this way
And improve the production cost of enterprise.
Summary of the invention
The object of the present invention is to provide a kind of stable structure, there is stepless time adjustment, drilling machine with long service life.
The object of the present invention is achieved like this: a kind of drilling machine, including pedestal, support rod, workbench and head, described
It is provided with support rod on pedestal, a workbench is arranged on the support rod, the workbench side is provided with one and enough controls work
Make the rotation rocker arm that platform slides on the support columns, the upper end of the support rod is equipped with a head, the machine by connecting flange
Rotating disc, gear-box and the driving spindle rotation that head includes head frame, head frame side is arranged in and driving spindle moves up and down are forever
Magneto, the output shaft of the magneto are connected with the belt wheel, and the magneto side is provided with a frequency converter, and leads to
Conducting wire interconnection is crossed, the frequency converter is mounted on a frame, several are provided on the frequency converter for adjusting the speed and opening
The control device stopped.
Preferably, a damping device is provided on the pedestal, the damping device includes crash roll, noise reduction sponge, prevents
Shake rubber base and antirattle spring, the chassis interior are provided with crash roll and noise reduction sponge, and the crash roll is fixedly connected on pedestal,
The pedestal lower end is provided with shockproof rubber base, and the pedestal is fixedly connected on shockproof rubber base, and the antirattle spring is located at pedestal
Upper end, the antirattle spring are located at support column lower end.
Preferably, it is provided with a sleeve on the outside of the main shaft, the sleeve outer wall forms a several tooth sockets, the tooth socket
It is meshed with the molding axis tooth in rotating disc side, drives the turn disc, realize moving up and down for the sleeve.
Preferably, the support column side is provided with a rack gear, and the both ends of the rack gear are respectively and fixedly provided with a relieving ring, described
Relieving ring is set on the support column, and the workbench is set on the support column and rack gear, by driving the rotation
Moving up and down for workbench is realized in rocker arm rotation.
Preferably, the side of the workbench is equipped with side baffle, and the quantity of the side baffle is three, and three are vertically arranged
Side baffle be located at the two sides and rear portion of workbench, the front of workbench is equipped with front apron, and the height of front apron is lower than side
Baffle；One side baffle is equipped at least one set of blower fan group, and side baffle is provided with the first air port and the second air port, first air port and
The connection of the discharge pipe of second air port and blower fan group；The outside of another side baffle connects packaging container, and the lower part of the packaging container is to receive
It receives portion, a containing cavities is formed in the incorporating section.
Preferably, be provided with side plate outlet on the side baffle, side plate outlet is rectangle hole, the packaging container it is upper
Storage entrance is provided among portion, the storage entrance is connected to containing cavities.
Preferably, the top of the incorporating section is equipped with cover board, and the cover board is connected to molding limit in the containing cavities
On block, cover board is equipped with handle.
Preferably, the blower fan group includes blower, and the blower is connect with ventilation duct, and the end of the ventilation duct connects
Pipe, the adapter tube are connected to air port, and the blower is obliquely installed.
The present invention is prominent and beneficial compared with prior art to be had the technical effect that
1. the stepless speed regulation of main shaft of the present invention is that input is realized on knob or touch screen on control panel, no longer need
Shield replacement belt gear is opened, is operated extremely convenient.
2. drilling machine of the present invention can close the revolving speed for directly controlling drill bit by control button, easy to operate, is conducive to raising and adds
Work efficiency rate.Drilling machine can stable stepless speed regulation, can arbitrarily select optimal processing revolving speed.The volume for reducing drilling machine, saves
Metal material；The drilling machine can rationally utilize electric energy, save electricity consumption.Drilling machine has the characteristic of invariable power or permanent torque, can guarantee
Excellent machinability in high revolving speed and the slow-speed of revolution.Under the influence of extraneous power grid, external force and material hardness, drilling machine remains to protect
The quality of card drilling cutting.
3. the present invention is by setting crash roll, noise reduction sponge, shockproof rubber base and antirattle spring, when the work of industrial drilling machine,
Entire machine at high speeds operating can generate vibration, cause the gap of sleeve and spindle box increasing, ventilate larger, thus
Noise is caused, when two antirattle spring beside the support column are passed in the vibration of upper end, described two antirattle spring meetings
A certain amount of damping is carried out to machine, then the crash roll of the chassis interior can further decrease vibration, in the pedestal
The noise reduction sponge in portion can also absorb the noise of generation, and the shockproof rubber base under the pedestal can be to the vibration to remain little again
It is primary to weaken, vibration is minimized, the service life of machine is improved, staff's working efficiency is improved, does not influence work
The life and health of personnel.
4. the present invention for the workbench of current drilling machine there are clast splashings the shortcomings that, design has been carried out to workbench and has been changed
Into, installed baffle additional on original workbench, and accessed blower fan group and store clast packaging container, thus be avoided that operator
Member's body comes to harm, and ensure that work safety.
Detailed description of the invention
Fig. 1 is structure diagram of the invention；
Fig. 2 is the structure diagram that the present invention goes to turn around after frame；
Fig. 3 is cross-sectional view of the invention；
Fig. 4 is the structure diagram of the embodiment of the present invention two；
Fig. 5 is one of two workbench of the embodiment of the present invention and structure diagram of packaging container；
Fig. 6 is the two of the structure diagram of two workbench of the embodiment of the present invention and packaging container；
Fig. 7 is the cross-sectional view of two packaging container of the embodiment of the present invention.
In figure: 1- drill bit；11- sleeve；12- tooth socket；13- axis tooth；14- rack gear；
15- relieving ring；2- main shaft；22- side baffle；The outlet of 220- side plate；The first air port 221-；
The second air port 222-；23- front apron；24- packaging container；The incorporating section 240-；241- stores entrance；
242- containing cavities；25- cover board；27- handle；28- blower；280- ventilation duct；281- adapter tube；
3- damping device；31- pedestal；32- crash roll；33- noise reduction sponge；The shockproof rubber base of 34-；
35- antirattle spring；4- framves；41- magneto；42- frequency converter；43- control device；
5- rotating disc；6- belt wheel；7- support column；8- connecting flange；9- workbench；
10- rotates rocker arm.
Specific embodiment
The present invention is described further with specific embodiment below.
Embodiment one: as shown in Figure 1-3, a kind of drilling machine, including pedestal 31, support rod 7, workbench 9 and head, it is described
It is provided with support rod 7 on pedestal 31, a workbench 9 is arranged on the support rod 7, it is enough that 9 side of workbench is provided with one
The upper end of the rotation rocker arm 10 that control workbench 9 slides on support column 7, the support rod 7 is equipped with one by connecting flange 8
Head, the head includes a frame 4,4 side of head frame is arranged in and driving spindle 2 moves up and down rotating disc 5,67 and of gear-box
The magneto 41 that driving spindle 2 rotates, the output shaft of the magneto 41 are connected with the belt wheel 6, the magneto
41 sides are provided with a frequency converter 42, and are connected with each other by conducting wire, and the frequency converter 42 is mounted on a frame 4, the frequency conversion
Several are provided on device 42 for adjusting the speed and the control device 43 of start and stop.
Control device 43 in the technical program includes panel, inching button, start button, scram button, stop button
And speed regulation turn-knob, such setting can enhanced convenience for the control on controlling rotation speed of main shaft of motor, pass through magneto 41
And the mode of frequency converter 42 can be stable carry out speed on transformation, the stepless speed regulation of main shaft can be on control panel
Input is realized on knob or touch screen, it is no longer necessary to be opened shield replacement belt gear, be operated extremely convenient.Drilling machine can pass through
Control button closes the revolving speed for directly controlling drill bit, easy to operate, is conducive to improve processing efficiency.Drilling machine can stable stepless-adjustment
Speed can arbitrarily select optimal processing revolving speed.The volume for reducing drilling machine, saves metal material；The drilling machine can be utilized rationally
Electric energy has saved electricity consumption.Drilling machine has the characteristic of invariable power or permanent torque, can guarantee good in high revolving speed and the slow-speed of revolution plus
Work performance.Under the influence of extraneous power grid, external force and material hardness, drilling machine still ensures that the quality of drilling cutting.
Preferably, a damping device 3 is provided on the pedestal, the damping device 3 includes crash roll 32, noise reduction sponge
33, shockproof rubber base 34 and antirattle spring 35, the pedestal 31 are internally provided with crash roll 32 and noise reduction sponge 33, the crash roll
32 are fixedly connected on pedestal 31, and 31 lower end of pedestal is provided with shockproof rubber base 34, and the pedestal 31 is fixedly connected on shockproof glue
Seat 34, the antirattle spring 35 is located at the upper end of pedestal 31, and the antirattle spring 35 is located at 7 lower end of support column.
The technical program is by setting crash roll 32, noise reduction sponge 33, shockproof rubber base 34 and antirattle spring 35, when industry is bored
When bed work, entire machine at high speeds operating can generate vibration, cause the gap of sleeve 11 and spindle box increasing, make air stream
Lead to it is larger, it is described when two antirattle spring 35 on 7 side of support column are passed in the vibration of upper end to cause noise
Two antirattle spring 35 can carry out a certain amount of damping to machine, then the crash roll 32 pedestal 31 inside understand to shake into
One step reduces, and the noise reduction sponge 33 inside the pedestal 31 can also absorb the noise of generation, anti-under the pedestal 31
Shake rubber base 34 can weaken again the vibration to remain little, minimize vibration, improve the service life of machine, make work
Person works' efficiency improves, and does not influence the life and health of staff.
Preferably, a sleeve 11 is provided on the outside of the main shaft 2,11 outer wall of sleeve forms a several tooth sockets 12,
The tooth socket 12 is meshed with the molding axis tooth 13 in 5 side of rotating disc, drives the rotating disc 5 to rotate, realizes the sleeve 11
Move up and down.
The technical program is only needed through the rotation of rotating disc 5 just by the mutual cooperation operative employee of tooth socket 12 and axis tooth 13
The height of adjustable drill bit 1, it is easy to operate, it can quickly realize the positioning of drill bit 1.
Preferably, 7 side of support column is provided with a rack gear 14, and the both ends of the rack gear 14 are respectively and fixedly provided with a relieving ring
15, the relieving ring 15 is set on the support column 7, and the workbench 9 is set on the support column 7 and rack gear 14, is led to
Moving up and down for workbench 9 is realized in rotation rocker arm 10 rotation of overdriving.
The relieving ring 15 of the technical program to the fixation rack gear 14 that 2 side of main shaft is arranged in, workbench 8 by with
Locking, the mesh degree of rotation rocker arm 10 adjustable working table 9 and rack gear 14, to adjust workbench are realized in the engagement of rack gear 14
9 height.
Embodiment two: as shown in figs. 4-7: the present embodiment is basically the same as the first embodiment, and difference is the workbench
9 side is equipped with side baffle 22, and the quantity of the side baffle 22 is three, and three side baffles 22 being vertically arranged are located at work
Make the two sides and rear portion of platform 9, the front of workbench 9 is equipped with front apron 23, and the height of front apron 23 is lower than side baffle 22；One side block
Plate 22 is equipped at least one set of blower fan group, and side baffle 22 is provided with the first air port 221 and the second air port 222, first air port 221
It is connect with the second air port 222 with the discharge pipe of blower fan group；The outside of another side baffle 22 connects packaging container 24, the packaging container 24
Lower part be incorporating section 240, form a containing cavities 242 in the incorporating section 240.
The technical program for the workbench 9 of current drilling machine there are clast splashings the shortcomings that, workbench 9 is designed
It improves, has installed baffle additional on original workbench 9, and accessed blower fan group and stored the packaging container 24 of clast, thus be avoided that
Operator's body comes to harm, and ensure that work safety.
Preferably, side plate outlet 220 is provided on the side baffle 22, the side plate outlet 220 is rectangle hole, the receipts
Receive body 24 top among be provided with storage entrance 241, the storage entrance 241 is connected to containing cavities 242.
Preferably, the top of the incorporating section 240 is equipped with cover board 25, and the cover board 25 is connected to molding in the containing cavities
Limited block on, cover board 25 be equipped with handle 27.
Preferably, the blower fan group includes blower 28, and the blower 28 is connect with ventilation duct 280, the ventilation duct 280
End connecting tubes 281, the adapter tube 281 are connected to air port 221, and the blower 28 is obliquely installed.
In real work, in the process of work, the clast of splashing can be by by the first blower 28 and the second blower 29 for drilling machine
It is blown into side plate outlet 220, containing cavities 242 are then entered by the inner cavity of storage entrance 241 and packaging container 24, if necessary to clean
Clast among containing cavities 242 opens screw 26 and removes cover board 25.It is to pass through hook between packaging container 24 and side baffle 22
It being embedded among pocket for the punch head or in such a way that screw fastens come what is fixed, such structure is convenient for loading and unloading, when installation,
It can guarantee that side plate outlet 220 and storage entrance 241 are completely corresponding.First blower 28 and the second blower 29 are all obliquely installed,
Space can be saved in this way, the first blower 28 is connected to by the first ventilation duct 280 and the first adapter tube 281 with the first air port 221, the
Two blowers 29 are connected to by the second ventilation duct 290 and the second adapter tube 291 with the second air port 222, the first blower 28 and the second blower
29 can be blown into clast among storage entrance 241, reach it among containing cavities 242.
Above-described embodiment is only presently preferred embodiments of the present invention, is not limited the scope of the invention according to this, therefore: it is all according to
The equivalence changes that structure of the invention, shape, principle are done, should all be covered by within protection scope of the present invention.
Claims (8)
1. a kind of drilling machine, which is characterized in that including pedestal (31), support rod (7), workbench (9) and head, the pedestal
(31) it is provided on support rod (7), is arranged with a workbench (9) on the support rod (7), workbench (9) the side setting
There is one enough to control the rotation rocker arm (10) workbench (9) slided on support column (7), the upper end of the support rod (7) passes through company
Acting flange (8) is equipped with a head, the head include head frame (4), setting in head frame (4) side and driving spindle (2) up and down
The magneto (41) of mobile rotating disc (5), gear-box (67) and driving spindle (2) rotation, the magneto (41)
Output shaft is connected with the belt wheel (6), and magneto (41) side is provided with a frequency converter (42), and mutual by conducting wire
Connection, the frequency converter (42) are mounted on a frame (4), several are provided on the frequency converter (42) for adjusting the speed and opening
The control device (43) stopped.
2. a kind of drilling machine according to claim 1, which is characterized in that be provided with a damping device (3), institute on the pedestal
Stating damping device (3) includes crash roll (32), noise reduction sponge (33), shockproof rubber base (34) and antirattle spring (35), the pedestal
(31) it is internally provided with crash roll (32) and noise reduction sponge (33), the crash roll (32) is fixedly connected on pedestal (31), described
Pedestal (31) lower end is provided with shockproof rubber base (34), and the pedestal (31) is fixedly connected on shockproof rubber base (34), the shockproof bullet
Spring (35) is located at the upper end of pedestal (31), and the antirattle spring (35) is located at support column (7) lower end.
3. a kind of drilling machine according to claim 1, which is characterized in that a sleeve (11) are provided on the outside of the main shaft (2),
Sleeve (11) outer wall forms a several tooth sockets (12), the tooth socket (12) and the molding axis tooth in rotating disc (5) side
(13) it is meshed, drives the rotating disc (5) to rotate, realize moving up and down for the sleeve (11).
4. a kind of drilling machine according to claim 1, which is characterized in that support column (7) side is provided with a rack gear
(14), the both ends of the rack gear (14) are respectively and fixedly provided with a relieving ring (15), and the relieving ring (15) is set in the support column (7)
On, the workbench (9) is set on the support column (7) and rack gear (14), by driving the rotation rocker arm (10) to rotate
Realize moving up and down for workbench (9).
5. a kind of drilling machine according to claim 1, which is characterized in that the side of the workbench (9) is equipped with side baffle
(22), the quantity of the side baffle (22) is three, and three side baffles (22) being vertically arranged are located at the two of workbench (9)
The front at side and rear portion, workbench (9) is equipped with front apron (23), and the height of front apron (23) is lower than side baffle (22)；One side block
Plate (22) is equipped at least one set of blower fan group, and side baffle (22) is provided with the first air port (221) and the second air port (222), and described the
One air port (221) and the second air port (222) are connect with the discharge pipe of blower fan group；The outside of another side baffle (22) connects packaging container
(24), the lower part of the packaging container (24) is incorporating section (240), forms a containing cavities (242) in the incorporating section (240).
6. a kind of drilling machine according to claim 5, which is characterized in that be provided with side plate outlet on the side baffle (22)
(220), the side plate outlet (220) is rectangle hole, and storage entrance (241) is provided among the top of the packaging container (24),
The storage entrance (241) is connected to containing cavities (242).
7. a kind of drilling machine according to claim 5, which is characterized in that the top of the incorporating section (240) is equipped with cover board
(25), the cover board (25) is connected in the containing cavities on molding limited block, and cover board (25) is equipped with handle (27).
8. a kind of drilling machine according to claim 5, which is characterized in that the blower fan group includes blower (28), the blower
(28) it is connect with ventilation duct (280), the end connecting tubes (281) of the ventilation duct (280), adapter tube (281) and the air port
(221) it is connected to, the blower (28) is obliquely installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811544549.1A CN109604664A (en) | 2018-12-17 | 2018-12-17 | A kind of drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811544549.1A CN109604664A (en) | 2018-12-17 | 2018-12-17 | A kind of drilling machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109604664A true CN109604664A (en) | 2019-04-12 |
Family
ID=66010245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811544549.1A Pending CN109604664A (en) | 2018-12-17 | 2018-12-17 | A kind of drilling machine |
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| Country | Link |
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| CN (1) | CN109604664A (en) |
Cited By (3)
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| CN110026578A (en) * | 2019-04-28 | 2019-07-19 | 贾慧静 | Drilling machine with speed-regulating function |
| CN113878140A (en) * | 2021-11-01 | 2022-01-04 | 张松 | Drilling machine capable of quickly converting drill bits and using method thereof |
| CN117324654A (en) * | 2023-11-20 | 2024-01-02 | 青岛格物木工机械制造有限公司 | Multifunctional direct-drive drilling machine |
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| CN110026578A (en) * | 2019-04-28 | 2019-07-19 | 贾慧静 | Drilling machine with speed-regulating function |
| CN113878140A (en) * | 2021-11-01 | 2022-01-04 | 张松 | Drilling machine capable of quickly converting drill bits and using method thereof |
| CN117324654A (en) * | 2023-11-20 | 2024-01-02 | 青岛格物木工机械制造有限公司 | Multifunctional direct-drive drilling machine |
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Application publication date: 20190412 |
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| RJ01 | Rejection of invention patent application after publication |