CN110369812A - A kind of hex nut chasing bar - Google Patents

A kind of hex nut chasing bar Download PDF

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Publication number
CN110369812A
CN110369812A CN201910539898.2A CN201910539898A CN110369812A CN 110369812 A CN110369812 A CN 110369812A CN 201910539898 A CN201910539898 A CN 201910539898A CN 110369812 A CN110369812 A CN 110369812A
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CN
China
Prior art keywords
feeding track
hex nut
nut
chasing bar
bifurcated
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.)
Granted
Application number
CN201910539898.2A
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Chinese (zh)
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CN110369812B (en
Inventor
付志青
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Jinlijia Hardware Precision Technology Co ltd
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Individual
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Priority to CN201910539898.2A priority Critical patent/CN110369812B/en
Publication of CN110369812A publication Critical patent/CN110369812A/en
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Publication of CN110369812B publication Critical patent/CN110369812B/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23GTHREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G1/00Thread cutting; Automatic machines specially designed therefor
    • B23G1/16Thread cutting; Automatic machines specially designed therefor in holes of workpieces by taps
    • B23G1/20Machines with a plurality of working spindles
    • B23G1/205Machines with a plurality of working spindles specially adapted for making nuts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23GTHREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G1/00Thread cutting; Automatic machines specially designed therefor
    • B23G1/44Equipment or accessories specially designed for machines or devices for thread cutting

Abstract

The invention discloses a kind of hex nut chasing bars, belong to technical field of mechanical processing.The main technical essential of the present invention is, by the way that straight feeding track end is diverged to production into two symmetrical bifurcated feeding tracks, and two bifurcated feeding track end rotoflectors are at vertical feeding track, and then hex nut to be processed is divided into two rows of arrangements, it is fixed by the way that a fixation kit is respectively set on two vertical feeding tracks to nut is threaded, and two screw taps by being correspondingly arranged on the inside of device with fixation kit carry out tapping to fixed nut, the bevel gear of motor end can provide power simultaneously for two screw taps, both tapping can be carried out to two hex nuts simultaneously, it is high-efficient and consume energy low.

Description

A kind of hex nut chasing bar
Technical field
The invention belongs to machine processing fields, and in particular to a kind of hex nut chasing bar.
Background technique
All too busy to get away nut, nut have been exactly nut to the industries such as present industry, manufacturing industry, building, with bolt or Screw rod is threaded together the part for playing the role of fastening, it is all manufacture it is mechanical must a kind of element, nut is by machine The part that tool equipment closely connects, by the screw thread of inside, equivalent specifications nuts and bolt can just link together, nut The production of screw thread needs to carry out tapping with threading apparatus.
Tapper is a kind of hole of part in the various through-holes or blind hole with various specifications such as nut, ring flange Medial surface process internal screw thread, screw or the machining equipment for making tooth buckle;Tapper is also nut tapping machine, nut Nut tapping machine is all called in tapping machine, automatic nut tapping machine, full-automatic tapper, tooth machining unit, tapping machine, south, All it is called tapper in the north.According to the difference of driving power type, tapper can be divided into pneumatic power nut tapper, electricity Dynamic tooth machining unit and hydraulic tooth machining unit etc.;It is different according to tapper main shaft number, uniaxial tapper, two axis spiral shells can be divided into Female four axis tapper of tapping machine, six axis tappers etc.;Different according to the type of nut processing, tapper again may be used Be divided into heat beat tapper, flange nut tapping machine, round nut tapping machine, hex nut tapping machine, grommet nut tapping machine, The Multiple Types such as anti-theft nut tapping machine;Different according to the degree of automation of nut tapping machining process, tapper can It is divided into full-automatic tapper, semi-automatic tapper and tapper.Full-automatic tapper the degree of automation Highest, when work, as long as nut blank be put into hopper can automatic feed, automatic positioning, Automatic-clamping, automatic screw, Automatic discharging, a worker can operate multiple devices simultaneously, and high production efficiency can significantly save labor cost.Nut is attacked Silk machine has novel in design, structurally reasonable, easy easy-to-use, high degree of automation, easy to use, high-efficient, non-maintaining, cost performance The various nut threads of the features such as high, good nut tapping machining are highly polished, and product qualified rate can reach 100%.
Hex nut product is one of most common fastener, is used in component is linked and packed with bolt, screw fit. Generally it is divided into I type, II type and three kinds slim by nominal thickness.Wherein I type is most widely used and is divided into A, B, C three-level, and A, B grades are applicable in In in the high machine of required precision, equipment and structure.Hex nut selects material very extensive, as carbon steel, stainless steel, high temperature close Gold, copper alloy, extraordinary titanium alloy etc..This is but also it is whether civilian or in fields such as high-precision machinery, space flight, ships There is application, the huge market demand has a extensive future.
The common processing method of nut inner thread mainly uses lathe process and tapping to process, and tapping is to adopt to utilize screw tap It screws in nut blank inner hole and disposably processes nut inner thread, it is easy to process, in nut mass production, mainly use tapping Machine carries out tapping to nut.
The conventional machining process of tapping process the degree of automation in to(for) hex nut is low, need manual operation to workpiece into The advance and retreat knife that row fixes to clamp then operation drilling machine progress tapping is time-consuming and laborious, and nowadays existing equipment technology attacks hex nut Silk realizes automation, only needs that charging tray will be poured into tapping nut, saves labour productive forces and improve production safety, but It is that, such as only one chasing bar, a workpiece can only be processed every time, efficiency is lower there is also one side defect.
Summary of the invention
The technical problems to be solved by the invention: it aiming at the problem that processing efficiency is low for current hex nut chasing bar, mentions For a kind of hex nut chasing bar.
In order to solve the above technical problems, the present invention is using technical solution as described below:
A kind of hex nut chasing bar, including hex nut, connecting tube, motor, screw tap and magazine;It is set above the connecting tube There is a funnelform charging tray, and the connecting tube is placed upper end vertically and communicated with osculum end on the downside of charging tray, the connecting tube lower end Equipped with straight feeding track, upper end is equipped with flapper component, and the straight feeding track on the left of the straight feeding track The other end diverges to form two bifurcated feeding tracks being symmetrically installed from centre, and two bifurcateds feeding track other end is suitable The vertical feeding track of hour hands rotated ninety degrees, described two vertical feeding track middle positions are respectively equipped with a fixation kit For the fixed hex nut for preparing tapping, the motor is located at two bifurcated feeding track angles, is equipped with below the motor Transmission shaft A, the end the transmission shaft A is fixed to be equipped with bevel gear A, is set below the bevel gear A there are two symmetrical bevel gear B, And the bevel gear A is engaged with two bevel gears B respectively, a transmission shaft B is separately installed on the two bevel gears B, described two pass The moving axis B other end is cased with a telescopic rod A respectively, and the two telescopic rods A other end is respectively provided with a screw tap.
Preferably, the rod set in the fixation kit is vertically positioned at below vertical feeding track, installation above the rod set Pedestal is fixedly mounted above telescopic rod B, the telescopic rod B, the pedestal both ends pass through hinge C and connecting rod one end respectively Active link, described two connecting rod other ends are equipped with hinge B and are flexibly connected with baffle upper end, below two baffle and cut with scissors Chain A is connected, and the two flappers range is 0 ° ~ 60 °.
Preferably, fixation kit of two screw tap respectively on feeding track vertical with both sides is corresponding.
Preferably, the bifurcated feeding track and vertical feeding rail are smoothly connected.
Preferably, the bifurcated feeding track and vertical feeding track opening are equipped with two rows of overhead gages.
Preferably, diameter of the beginning gap greater than screw tap among the overhead gage.
Preferably, the rotation axis in the flapper component is located at flap shutter center and keeps left at position.
Preferably, the magazine is located at below two vertical feeding track ends.
Preferably, the motor selects threephase asynchronous.
The present invention is compared with other methods, and advantageous effects are:
A kind of hex nut chasing bar of the present invention, it is symmetrical at two by the way that straight feeding track end is diverged to production Bifurcated feeding track, and two bifurcated feeding track end rotoflectors are at vertical feeding track, and then by be processed six Angle nut is divided into two rows of arrangements, is consolidated by the way that a fixation kit is respectively set on two vertical feeding tracks to nut is threaded It is fixed, and two screw taps by being correspondingly arranged on the inside of device with fixation kit carry out tapping to fixed nut, motor end Bevel gear can provide power simultaneously for two screw taps, and both can two hex nuts be carried out with tapping simultaneously, high-efficient and consume energy low.
Detailed description of the invention
Fig. 1 is a kind of overlooking structure diagram of hex nut chasing bar of the present invention;
Fig. 2 is Fig. 1 side view of the invention;
Fig. 3 is the enlarged diagram of B area in Fig. 2;
Fig. 4 is the structural schematic diagram of flapper component in Fig. 1;
Fig. 5 is A-A cross-sectional view in Fig. 1;
1, charging tray;2, connecting tube;3, straight feeding track;4, bifurcated feeding track;401, overhead gage;5, vertical feeding track; 6, fixation kit;601, baffle;602, hinge A;603, hinge B;604, connecting rod;605, hinge C;606, pedestal;607, it stretches Contracting bar B;608, rod set;7, motor;701, transmission shaft A;702, bevel gear A;703, bevel gear B;704, transmission shaft B;705, it stretches Contracting bar A;706, screw tap;8, flapper component;801, rotation axis;802, flap shutter;9, hex nut;10, magazine.
Specific embodiment
Below in conjunction with the attached drawing in the present invention, technical solution in the embodiment of the present invention carry out it is clear, completely retouch It states, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention In embodiment, those skilled in the art's all other reality obtained without making creative work Example is applied, protection scope of the present invention is belonged to.
A kind of hex nut chasing bar as shown in Fig. 1 ~ 5, including hex nut 9, connecting tube 2, motor 7, screw tap 706 With magazine 10;A funnelform charging tray 1 is equipped with above the connecting tube 2, and the connecting tube 2 places upper end and charging tray 1 vertically Downside osculum end communicates, and 2 lower end of connecting tube is equipped with straight feeding track 3, and the hex nut 9 in such charging tray is freely downward It falls on the straight feeding track 3 of lower section, 3 left side upper end of straight feeding track is equipped with flapper component 8, and such as Fig. 4 institute Show, the rotation axis 801 in flapper component 8 is located at 802 center of flap shutter and keeps left at position, can pass through rotation rotation in this way Baffle 802 pass through the height of its lower end surface can only for a hex nut every time, and then be arranged in hex nut 9 one by one Be not in stratification on straight feeding track 3, orderly carried out convenient for subsequent handling.
As shown in Figure 1,3 other end of straight feeding track diverges to form two bifurcated feeding tracks being symmetrically installed from centre 4, two bifurcated feeding tracks, 4 other end is the vertical feeding track 5 of rotated ninety degrees clockwise, bifurcated feeding track 4 It is smoothly connected with vertical feeding rail 5, makes hex nut 9 horizontally arranged on bifurcated feeding track 4 through vertical feeding track 5 in this way Become to be arranged vertically, tapping is carried out to its centre bore convenient for horizontally disposed screw tap 706.
As shown in Figure 1, two 5 middle positions of vertical feeding track are respectively equipped with a fixation kit 6 for fixed preparation Hex nut 9 on straight feeding track 3 can be divided into two rows in this way by the hex nut 9 of tapping, and by as shown in Figure 2,3 Fixation kit 6 fixes it to carry out tapping to it.As shown in Figure 1, motor 7 is located at two bifurcated feeding tracks, 4 angle, institute It states equipped with transmission shaft A701 below motor 7, the end the transmission shaft A701 is fixed to be equipped with bevel gear A702, the bevel gear A702 Lower section is set there are two symmetrical bevel gear B703, and the bevel gear A702 is engaged with two bevel gears B703 respectively, such knot Structure makes motor 7 the cone tooth B703 on both sides can be driven to rotate by bevel gear A702;And it is installed respectively on two bevel gears B703 There is a transmission shaft B704, the two transmission shafts B704 other end is cased with a telescopic rod A705 respectively, and such structure to stretch Bar A705 can the movement of left and right horizontal direction, and then drive the screw tap 706 or so that is fixedly mounted respectively of the two telescopic rod A705 other ends Horizontal movement, motor 7 can provide rotary power simultaneously for two screw taps 706, and the low and mechanical structure that consumes energy is simple, reliable.
Rod set 608 in the fixation kit 6 is vertically positioned at vertical 5 lower section of feeding track, installs above the rod set 608 Pedestal 606 is fixedly mounted above telescopic rod B607, the telescopic rod B607,606 both ends of pedestal pass through hinge respectively C605 and 604 one end active link of connecting rod, described two 604 other ends of connecting rod be equipped with hinge B603 and on baffle 601 End is flexibly connected, and two baffles, 601 lower section is connected with hinge A602, and two baffles, 601 slewing area is 0 ° ~ 60 °, in this way When hex nut 9 reaches two baffle middle positions through vertical feeding track 5, rod set 608 pushes telescopic rod B607 upward, thus Drive pedestal 606 move up and push both sides connecting rod 604 drive baffle 601 be rotated up and with hex nut lower end Both sides contact and fix to it, and corresponding screw tap 706 is completed rear telescopic rod B607 to 9 tapping of hex nut and shunk, and drive two gears Plate 601 is pivotally lowered into vertical 5 lower end of feeding track, and return preparation is fixed again.
Fixation kit 6 of two screw tap 706 respectively on feeding track 5 vertical with both sides is corresponding, and then to fixed group The fixed hex nut 9 of part 6 carries out tapping.
The bifurcated feeding track 4 and 5 opening of vertical feeding track are equipped with two rows of overhead gages 401, guarantee the six of transmission Angle nut 9 is not fallen out, and guarantees that hex nut 9 is steadily run in vertical feeding track 5 from bifurcated feeding track 4.
Start the diameter that gap is greater than screw tap 706 among the overhead gage 401, screw tap 706 will not be hampered in this way to six Nut 9 centre bore in angle carries out tapping.
The magazine 10 is located at below two vertical 5 ends of feeding track, and the hex nut after tapping falls into collect.
The motor 7 selects threephase asynchronous, it can be achieved that positive and negative rotation, is received convenient for the reversion cooperation of screw tap 706 telescopic rod A Withdrawing is realized in contracting.
Workflow of the present invention are as follows: adjusting the flap shutter 802 in flapper component 8 downwards keeps hex nut 9 rigid It can pass through well, the hex nut 9 in charging tray 1 falls from connecting tube 2 and send by the arrangement of straight feeding track 3 by two bifurcateds Material track 4 is separated into two rows of arrangements, then is vertically arranged by the presentation of vertical feeding track 5 of 4 end of bifurcated feeding track, when six Angle nut 9 reach two baffles 601 in two fixation kits 6 it is intermediate when, two rod sets 608 push corresponding telescopic rod B607 logical respectively The connecting rod 604 for crossing 606 both ends of pedestal drives two baffles 601 to close up to central rotational, clamps hex nut 9, at this time 7 band of motor Dynamic two screw taps 706 rotation, telescopic rod 705 pushes screw tap 706 from 9 centre bore of hex nut by its feed tapping, then electric Machine reversion, simultaneous retractable bar A705 back shrinkage, so make two screw taps 706 realize withdrawing, return complete a tapping, extend back Contracting bar B607 is shunk, and two connecting rods 604 is driven to make the expansion of two baffles 601 in 0 ° of return backward, and next workpiece is consolidated in preparation It is fixed.
The present invention is further described by specific embodiment above, it should be understood that, here specifically Description, should not be construed as the restriction for the essence of the present invention with range, and one of ordinary skilled in the art is reading this explanation The various modifications made after book to above-described embodiment belong to the range that the present invention is protected.

Claims (9)

1. a kind of hex nut chasing bar, including hex nut (9), connecting tube (2), motor (7), screw tap (706) and magazine (10), which is characterized in that a funnelform charging tray (1) is equipped with above the connecting tube (2), and the connecting tube (2) is put vertically It sets upper end to communicate with osculum end on the downside of charging tray (1), connecting tube (2) lower end is equipped with straight feeding track (3), and the level is sent Expect that upper end is equipped with flapper component (8) on the left of track (3), and the straight feeding track (3) other end diverges to form two The bifurcated feeding track (4) being symmetrically installed from centre, two bifurcated feeding tracks (4) other end are to rotate clockwise 90 The vertical feeding track (5) of degree, described two vertical feeding track (5) middle positions are respectively equipped with a fixation kit (6) use In the fixed hex nut (9) for preparing tapping, the motor (7) is located at two bifurcated feeding track (4) angles, the motor (7) lower section is equipped with transmission shaft A(701), the transmission shaft A(701) end is fixed that bevel gear A(702 is housed), the bevel gear A (702) symmetrical bevel gear B(703 there are two being set below), and the bevel gear A(702) nibbled respectively with two bevel gears B(703) Close, the two bevel gears B(703) on be separately installed with a transmission shaft B(704), the two transmission shaft B(704) other end difference It is cased with a telescopic rod A(705), the two telescopic rod A(705) other end is respectively provided with a screw tap (706).
2. a kind of hex nut chasing bar according to claim 1, which is characterized in that in the fixation kit (6) Rod set (608) is vertically positioned at below vertical feeding track (5), is mounted with telescopic rod B(607 above the rod set (608)), it is described Telescopic rod B(607) top be fixedly mounted pedestal (606), pedestal (606) both ends pass through hinge C(605 respectively) with connect Bar (604) one end active link, described two connecting rod (604) other ends be equipped with hinge B(603) and with baffle (601) upper end It is flexibly connected, is connected below two baffle (601) with hinge A(602), two baffles (601) slewing area is 0 ° ~ 60 °.
3. a kind of hex nut chasing bar according to claim 2, which is characterized in that two screw tap (706) is respectively Fixation kit (6) on feeding track (5) vertical with both sides are corresponding.
4. a kind of hex nut chasing bar according to claim 1, which is characterized in that the bifurcated feeding track (4) It is smoothly connected with vertical feeding rail (5).
5. a kind of hex nut chasing bar according to claim 1, which is characterized in that the bifurcated feeding track (4) Two rows of overhead gages (401) are equipped with vertical feeding track (5) opening.
6. a kind of hex nut chasing bar according to claim 5, which is characterized in that the overhead gage (401) is intermediate Start the diameter that gap is greater than screw tap (706).
7. a kind of hex nut chasing bar according to claim 1, which is characterized in that the flapper component (8) In rotation axis (801) be located at flap shutter (802) center and keep left at position.
8. a kind of hex nut chasing bar according to claim 1, which is characterized in that the magazine (10) is located at two and hangs down Below straight feeding track (5) end.
9. a kind of hex nut chasing bar according to claim 1, which is characterized in that the motor (7) selects three-phase Asynchronous motor.
CN201910539898.2A 2019-06-21 2019-06-21 Hexagonal nut tapping device Active CN110369812B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910539898.2A CN110369812B (en) 2019-06-21 2019-06-21 Hexagonal nut tapping device

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Application Number Priority Date Filing Date Title
CN201910539898.2A CN110369812B (en) 2019-06-21 2019-06-21 Hexagonal nut tapping device

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CN110369812A true CN110369812A (en) 2019-10-25
CN110369812B CN110369812B (en) 2020-11-27

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111069717A (en) * 2020-02-19 2020-04-28 邯郸市澳嘉紧固件制造有限公司 Full-automatic nut processingequipment
CN111069719A (en) * 2020-02-19 2020-04-28 邯郸市澳嘉紧固件制造有限公司 Continuous chasing bar of two-way feed nut
CN111673207A (en) * 2020-06-18 2020-09-18 李峡辉 Tapping and processing device for manufacturing steel bar sleeve
CN111069719B (en) * 2020-02-19 2024-04-16 邯郸市澳嘉紧固件制造有限公司 Continuous tapping device for bidirectional feed nut

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3338202A1 (en) * 1983-10-20 1985-05-02 VTU "A. Kančev", Russe Automatic for forming the thread on nuts
CN2163019Y (en) * 1993-07-08 1994-04-27 孙鸿儒 Reciprocating threading machine
KR20090007096A (en) * 2007-07-13 2009-01-16 진성토건 주식회사 Precast arch box structure having segment joint part
KR20090070963A (en) * 2007-12-27 2009-07-01 진삼하 Tap-rod monitoring method of tapping apparatus
CN102357687A (en) * 2011-10-10 2012-02-22 德利赉精密五金制品(深圳)有限公司 Machining fixture and automatic tapping machine
CN105499719A (en) * 2014-09-23 2016-04-20 长葛市煜昌机械有限公司 Nut tapping machine
CN106552970A (en) * 2016-11-21 2017-04-05 天津兴起工贸有限公司 A kind of automatic charging internal thread machining equipment
CN206241400U (en) * 2016-12-08 2017-06-13 海盐卫士标准件有限公司 A kind of nut tapping device
CN107900469A (en) * 2017-12-18 2018-04-13 温州瑞榕汽车零部件制造有限公司 A kind of efficiently flange nut chasing bar

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3338202A1 (en) * 1983-10-20 1985-05-02 VTU "A. Kančev", Russe Automatic for forming the thread on nuts
CN2163019Y (en) * 1993-07-08 1994-04-27 孙鸿儒 Reciprocating threading machine
KR20090007096A (en) * 2007-07-13 2009-01-16 진성토건 주식회사 Precast arch box structure having segment joint part
KR20090070963A (en) * 2007-12-27 2009-07-01 진삼하 Tap-rod monitoring method of tapping apparatus
CN102357687A (en) * 2011-10-10 2012-02-22 德利赉精密五金制品(深圳)有限公司 Machining fixture and automatic tapping machine
CN105499719A (en) * 2014-09-23 2016-04-20 长葛市煜昌机械有限公司 Nut tapping machine
CN106552970A (en) * 2016-11-21 2017-04-05 天津兴起工贸有限公司 A kind of automatic charging internal thread machining equipment
CN206241400U (en) * 2016-12-08 2017-06-13 海盐卫士标准件有限公司 A kind of nut tapping device
CN107900469A (en) * 2017-12-18 2018-04-13 温州瑞榕汽车零部件制造有限公司 A kind of efficiently flange nut chasing bar

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111069717A (en) * 2020-02-19 2020-04-28 邯郸市澳嘉紧固件制造有限公司 Full-automatic nut processingequipment
CN111069719A (en) * 2020-02-19 2020-04-28 邯郸市澳嘉紧固件制造有限公司 Continuous chasing bar of two-way feed nut
CN111069719B (en) * 2020-02-19 2024-04-16 邯郸市澳嘉紧固件制造有限公司 Continuous tapping device for bidirectional feed nut
CN111069717B (en) * 2020-02-19 2024-04-16 邯郸市澳嘉紧固件制造有限公司 Full-automatic nut processingequipment
CN111673207A (en) * 2020-06-18 2020-09-18 李峡辉 Tapping and processing device for manufacturing steel bar sleeve

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Inventor after: Huang Linbao

Inventor after: Xu Guihe

Inventor after: Fu Zhiqing

Inventor before: Fu Zhiqing

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Effective date of registration: 20201110

Address after: Room 101, building B, No. 30, Jiangjunmao community, Wulian community, Longgang street, Longgang District, Shenzhen City, Guangdong Province

Applicant after: Shenzhen jinlijia hardware precision technology Co.,Ltd.

Address before: 335108 Wangtang Formation 1, Daxi Township, Yugan County, Shangrao City, Jiangxi Province

Applicant before: Fu Zhiqing

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Denomination of invention: A hexagonal nut tapping device

Granted publication date: 20201127

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