CN204194868U - A kind of end face of flange boring beveling machine - Google Patents

A kind of end face of flange boring beveling machine Download PDF

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Publication number
CN204194868U
CN204194868U CN201420616607.8U CN201420616607U CN204194868U CN 204194868 U CN204194868 U CN 204194868U CN 201420616607 U CN201420616607 U CN 201420616607U CN 204194868 U CN204194868 U CN 204194868U
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CN
China
Prior art keywords
gear
worm
rotation dish
pinion rotation
linkage
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.)
Withdrawn - After Issue
Application number
CN201420616607.8U
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Chinese (zh)
Inventor
项光春
项玉振
张海峰
张红华
秦杰开
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.)
Zhejiang Aotai Machine Manufacturing Co Ltd
Original Assignee
Zhejiang Aotai Machine Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zhejiang Aotai Machine Manufacturing Co Ltd filed Critical Zhejiang Aotai Machine Manufacturing Co Ltd
Priority to CN201420616607.8U priority Critical patent/CN204194868U/en
Application granted granted Critical
Publication of CN204194868U publication Critical patent/CN204194868U/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to a kind of end face of flange boring beveling machine, particularly can the flange manufacturing machine of automatic tool advancing and retracting.The utility model is by the following technical solutions: a kind of machine that conveniently can manufacture flange, it is characterized in that: include round turntable seat, jig arm, cutter mounting frame and advance and retreat cutter transmission mechanism thereof, wherein round turntable seat includes fixed disk, pinion rotation dish and internal gear disc, described fixed disk or internal gear disc are provided with transmission device, transmission operation driven gear rolling disc rotates on fixed disk, described pinion rotation dish is provided with mounting bracket, cutter mounting frame slip be arranged on mounting bracket, pass through such scheme, the utility model overcomes the deficiency that prior art exists, there is provided a kind of easy to process, advance and retreat cutter freely, and the novel end face of flange boring beveling machine of advance and retreat cutter speed can be changed.

Description

A kind of end face of flange boring beveling machine
Technical field
The utility model relates to a kind of beveling machine manufacturing flange, particularly can the end face of flange boring beveling machine of automatic tool advancing and retracting.
Background technology
Also there is no a kind of end face of flange boring beveling machine in prior art, manufacture flange so just cumbersome, to need manually or punch press progressively completes, considerably increase labour cost, particularly larger to some flange needing symmetry higher, processes very inconvenient, and is difficult to accomplish symmetry.
Summary of the invention
The utility model overcomes the deficiency that prior art exists, and provide a kind of easy to process, advance and retreat cutter freely, and can change the novel end face of flange boring beveling machine of advance and retreat cutter speed.
To achieve these goals, the utility model is by the following technical solutions: a kind of end face of flange boring beveling machine, it is characterized in that: include round turntable seat, jig arm, cutter mounting frame and advance and retreat cutter transmission mechanism thereof, wherein round turntable seat includes fixed disk, pinion rotation dish and internal gear disc, described fixed disk or internal gear disc are provided with transmission device, described pinion rotation dish rotates and is arranged on fixed disk, described internal gear disc is fixedly installed on fixed disk, the first gear on the output shaft of transmission device engages with pinion rotation dish, transmission operation driven gear rolling disc rotates on fixed disk, described pinion rotation dish is provided with mounting bracket, cutter mounting frame slip be arranged on mounting bracket, described jig arm is arranged on fixed disk, described advance and retreat cutter transmission mechanism is arranged on pinion rotation dish, advance and retreat cutter transmission mechanism includes the second gear, first worm screw, first worm gear, second worm screw, second worm gear, driving gear set and screw rod, wherein the second gear engages with internal gear disc and arranges, first worm screw and the second gear are coaxially fixed or are wholely set, described first worm screw and the first worm gear, described second worm screw and the first worm gear are coaxially fixed or are wholely set, second worm screw and the second worm gear, second worm gear can drive driving gear set transmission, driving gear set can drive bolt rotary, screw rod and cutter mounting frame threaded engagement, bolt rotary can move by carry its tools installing rack on screw rod.
By adopting such scheme, we can process circular flange easily, wherein round turntable seat adopts such scheme, transmission device can be made when work easily to drive the running of advance and retreat cutter transmission mechanism, thus realize the movement of cutter mounting frame easily, advance and retreat cutter transmission mechanism above-mentioned in addition adopts such scheme, whole advance and retreat cutter transmission mechanism structure can be made so simple, run rationally, finally bolt rotary is driven by the cooperation of each worm and worm wheel, synchronously feed is realized like this in the processing of flange side face, make the principle that feed becomes progressively progressive, substantially prolongs cutting-tool's used life, the problem of exhaling into exhalation of feed before well solving.
Further setting of the present utility model is: described advance and retreat cutter transmission mechanism also includes outer cover frame and clutch block, described driving gear set includes linkage gear and travelling gear, wherein linkage gear and the second worm gear are coaxially arranged, travelling gear and screw rod circumference are fixedly installed, engageablely between linkage gear with travelling gear to coordinate, arranged by connecting axle between described linkage gear and the second worm gear, connecting axle is arranged on the shaft centre line of linkage gear and the second worm gear, linkage gear is fixedly connected with connecting axle, connecting axle and the second worm gear circumference are rotatably assorted, described clutch block to be set on connecting axle and to coordinate with the fixing axial slip of connecting axle circumference, second worm gear is provided with fixture block or draw-in groove towards clutch block side, described clutch block is provided with draw-in groove or fixture block towards the second worm gear side, fixture block on second worm gear or draw-in groove with can realize clutch between the draw-in groove on clutch block or fixture block and coordinate.
By the scheme arranged further, we can control the rotation of the second worm gear by clutch block, when clutch block engages with the opposite face of the second worm gear, at this time the second worm gear wheel can drive linkage gear to rotate, and can realize feed or withdrawing like this, when clutch block is separated with the opposite face of the second worm gear, at this time clutch block idle running, linkage gear is motionless, and at this time cutter mounting frame is motionless, we can carry out other operations to it, very convenient.
Of the present utility model setting further is again: described linkage gear is provided with two groups and is respectively the first linkage gear and the second linkage gear, first linkage gear is different with the diameter of the second linkage gear, described travelling gear is provided with two groups and is respectively the first travelling gear and the second travelling gear, first travelling gear is different with the diameter of the second travelling gear, the axial slip of described travelling gear be arranged on screw rod, hingedly on described outer cover frame be provided with handle, the lower end of handle is connected with travelling gear, pull handle can realize driving gearshaft and move along screw axial, the linkage gear that travelling gear slippage on screw rod can realize the little travelling gear of diameter linkage gear engage or the diameter large travelling gear large with diameter little with diameter engages.
By adopting such scheme, we well can select the speed of advance and retreat cutter as required, can carry out speeds control like this, increase work efficiency according to requirements of one's work, and such scheme is also unusual science in addition, simple to operate.
Of the present utility model setting further is again: described mounting bracket is provided with guide rail, described cutter mounting frame slippage is arranged on guide rail, described fixed disk is provided with roller around it, described pinion rotation dish is provided with the rail groove coordinated with roller, roller realizes being rotatably assorted in the rail groove of pinion rotation dish, described internal gear disc covers the top being arranged on the periphery groove of pinion rotation dish, pinion rotation dish inner top side shows out setting, and described mounting bracket is set up on pinion rotation dish inner top side face.
By adopting such scheme, make this product structure more reasonable, the setting of its middle guide is the sliding stability ensureing cutter mounting frame, the setting of roller and rail groove is the stability ensureing that pinion rotation dish rotates further in addition, certainly we do not arrange roller and are fine yet, but higher to product component processing request like this.
Of the present utility model setting further is again: described internal gear disc covers the top being arranged on the periphery groove of pinion rotation dish, pinion rotation dish inner top side shows out setting, described outer cover frame is fixedly installed on pinion rotation dish inner top side face, described first worm screw is fixedly installed on outer cover frame by clutch shaft bearing, the two ends of described first worm gear and the second worm screw are fixedly installed on outer cover frame by the third and fourth bearing, described second worm gear is arranged on outer cover frame by the 5th bearing, the connecting axle that described linkage gear is fixed is arranged on outer cover frame by the 6th bearing, described screw rod one end is located on outer cover frame by the 7th bearing bracket stand, the other end is located on mounting bracket by the 8th bearing bracket stand.
By adopting such scheme, being make this product structure more reasonable, easier for installation, running more stable.
Last setting of the present utility model is: be covered with cover cap above described internal gear disc, and the side of this cover cap covers the interior groove of internal gear disc, and described cover cap is fixed on pinion rotation dish or outer cover frame.
By adopting such scheme, can well internal gear disc be protected, too increase the security of product in addition.
Newly be described in further detail originally practical below in conjunction with accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the overall perspective view of the utility model embodiment;
Fig. 2 is the reflection advance and retreat cutter transmission mechanism internal structure schematic diagram of the utility model embodiment;
Fig. 3 is the structural representation that the utility model embodiment reflects the first worm gear;
Fig. 4 is the structural representation that the utility model embodiment reflects the first worm screw and the first worm gear
Fig. 5 is the structural representation of the utility model embodiment reflection Cutting tool installation manner shelf structure;
Fig. 6 is that the utility model embodiment reflects the sectional view that the first gear on the output shaft of transmission device engages with pinion rotation dish;
Fig. 7 is the pinion rotation dish stereogram in the utility model embodiment;
Fig. 8 is the G portion enlarged drawing in Fig. 1;
Fig. 9 is the A portion enlarged drawing in Fig. 2;
Figure 10 is the B portion enlarged drawing in Fig. 3;
Figure 11 is the C portion enlarged drawing in Fig. 4;
Figure 12 is the D portion enlarged drawing in Fig. 5;
Figure 13 is the F portion enlarged drawing in Fig. 5;
Figure 14 is the sectional view of the utility model embodiment reflection round turntable seat;
Figure 15 is the structural representation of the clutch block of the utility model embodiment;
Figure 16 is the structural representation that the second worm gear of the utility model embodiment coordinates with linkage gear.
Detailed description of the invention
As shown in Fig. 1-Figure 16, a kind of end face of flange boring beveling machine, include round turntable seat 1, jig arm 2, cutter mounting frame 3 and advance and retreat cutter transmission mechanism 4 thereof, wherein round turntable seat 1 includes fixed disk 11, pinion rotation dish 12 and internal gear disc 13, described fixed disk 11 or internal gear disc 13 are provided with transmission device 14, here transmission device 14 can be that electric transmission also can make hydraulic drive or Pneumatic Transmission, transmission device 14 can be provided with many groups, described pinion rotation dish 12 rotates and is arranged on fixed disk 11, described internal gear disc 13 is fixedly installed on fixed disk 11, the first gear 141 on the output shaft of transmission device 14 engages with pinion rotation dish 12, transmission device 14 work strip moving gear rolling disc 12 rotates on fixed disk 11, described pinion rotation dish 12 is provided with mounting bracket 121, cutter mounting frame 3 slip be arranged on mounting bracket 121, described jig arm 2 is arranged on fixed disk 11, described advance and retreat cutter transmission mechanism 4 is arranged on pinion rotation dish 12, advance and retreat cutter transmission mechanism 4 includes the second gear 41, first worm screw 42, first worm gear 43, second worm screw 44, second worm gear 45, driving gear set 46 and screw rod 47, wherein the second gear 41 engages with internal gear disc 13 and arranges, first worm screw 42 is fixed with the second gear 41 is coaxial or is wholely set, described first worm screw 42 coordinates with the first worm gear 43, described second worm screw 44 is fixed with the first worm gear 43 is coaxial or is wholely set, second worm screw 44 coordinates with the second worm gear 45, second worm gear 45 can drive driving gear set 46 transmission, driving gear set 46 can drive screw rod 47 to rotate, screw rod 47 and cutter mounting frame 3 threaded engagement, screw rod 47 rotates and can move on screw rod 47 by carry its tools installing rack 3.By adopting such scheme, we can process circular flange easily, wherein round turntable seat 1 adopts such scheme, transmission device 14 can be made when work easily to drive advance and retreat cutter transmission mechanism 4 to operate, thus realize the movement of cutter mounting frame 3 easily, advance and retreat cutter transmission mechanism 4 above-mentioned in addition adopts such scheme, whole advance and retreat cutter transmission mechanism 4 structure can be made so simple, run rationally, screw rod 47 is finally driven to rotate by the cooperation of each worm and worm wheel, synchronously feed is realized like this in the processing of flange side face, make the principle that feed becomes progressively progressive, substantially prolongs cutting-tool's used life, the problem of exhaling into exhalation of feed before well solving, here we are noted that fixed disk 11 can make an overall dish also can be fixedly connected with setting and form by multiple dish, jig arm 2 in the present embodiment is used for clamping flange, also can be spiral tensioning mechanism, also there is the jig arm of similar effect in applicant company before, its Main Function clamps flange, flange is made to be fixed on the middle part of round turntable seat 1.
In the utility model embodiment, described advance and retreat cutter transmission mechanism 4 also includes outer cover frame 48 and clutch block 49, described driving gear set 46 includes linkage gear 461 and travelling gear 462, wherein linkage gear 461 and the second worm gear 45 are coaxially arranged, travelling gear 462 and screw rod 47 circumference are fixedly installed, engageablely between linkage gear 461 with travelling gear 462 to coordinate, arranged by connecting axle 465 between described linkage gear 461 and the second worm gear 45, connecting axle 465 is arranged on the shaft centre line of linkage gear 461 and the second worm gear 45, linkage gear 461 is fixedly connected with connecting axle 465, connecting axle 465 and the second worm gear 45 circumference are rotatably assorted, described clutch block 49 to be set on connecting axle 465 and to coordinate with the fixing axial slip of connecting axle 465 circumference, second worm gear 45 is provided with fixture block or draw-in groove 451 towards clutch block 49 side, described clutch block 49 is provided with draw-in groove or fixture block 491 towards the second worm gear 45 side, fixture block on second worm gear 45 or draw-in groove 451 and the draw-in groove on clutch block 49 or clutch can be realized between fixture block 491 coordinate.By the scheme arranged further, we can control the rotation of the second worm gear 45 by clutch block 49, when clutch block 49 engages with the opposite face of the second worm gear 45, at this time the second worm gear 45 rotates and linkage gear 461 can be driven to rotate, and can realize feed or withdrawing like this, when clutch block 49 is separated with the opposite face of the second worm gear 45, at this time the second worm gear 45 dallies, and linkage gear 461 is motionless, and at this time cutter mounting frame 3 is motionless, we can carry out other operations to it, very convenient.
In the utility model embodiment, described linkage gear 461 is provided with two groups and is respectively the first linkage gear 4611 and the second linkage gear 4612, first linkage gear 4611 is different with the diameter of the second linkage gear 4612, described travelling gear 462 is provided with two groups and is respectively the first travelling gear 4621 and the second travelling gear 4622, first travelling gear 4621 is different with the diameter of the second travelling gear 4622, the axial slip of described travelling gear 462 be arranged on screw rod 47, hingedly on described outer cover frame 48 be provided with handle 481, the lower end of handle 481 is connected with travelling gear 462, pull handle 481 can realize travelling gear 462 axle and move axially along screw rod 47, the linkage gear 4612 that travelling gear 462 slippage on screw rod 47 can realize the little travelling gear of diameter 4621 linkage gear 4611 engage or the diameter large travelling gear 4622 large with diameter little with diameter engages.By adopting such scheme, we well can select the speed of advance and retreat cutter as required, can carry out speeds control like this, increase work efficiency according to requirements of one's work, and such scheme is also unusual science in addition, simple to operate.
In the utility model embodiment, described mounting bracket 121 is provided with guide rail 1211, the slippage of described cutter mounting frame 3 is arranged on guide rail 1211, described fixed disk 11 is provided with roller 111 around it, described pinion rotation dish 12 is provided with the rail groove 122 coordinated with roller 111, roller 111 realizes being rotatably assorted in the rail groove 122 of pinion rotation dish 12, described internal gear disc 13 covers the top being arranged on the periphery groove 123 of pinion rotation dish 12, setting is exposed in pinion rotation dish 12 inner top side face 124, described mounting bracket 121 is set up on pinion rotation dish 12 inner top side face 124, by adopting such scheme, make this product structure more reasonable, the setting of its middle guide 1211 is the sliding stabilities ensureing cutter mounting frame 3, the setting of roller 111 and rail groove 122 is the stability ensureing that pinion rotation dish 12 rotates further in addition, certainly we do not arrange roller 111 and are fine yet, but higher to product component processing request like this.
In the utility model embodiment, described outer cover frame 48 is fixedly installed on pinion rotation dish 12 inner top side face 124, described first worm screw 42 is fixedly installed on outer cover frame 48 by clutch shaft bearing 421, here clutch shaft bearing 421 can be two, two clutch shaft bearings 421 are arranged on the two ends of the first worm screw 42, the two ends of described first worm gear 43 and the second worm screw 44 are by the third and fourth bearing 431, 441 are fixedly installed on outer cover frame 48, described second worm gear 45 is arranged on outer cover frame 48 by the 5th bearing 451, the connecting axle 465 that described linkage gear 461 is fixed is arranged on outer cover frame 48 by the 6th bearing 4651, described screw rod 47 one end is erected on outer cover frame 48 by the 7th bearing 471, the other end is erected on mounting bracket 121 by the 8th bearing 472.By adopting such scheme, be make this product structure more reasonable, easier for installation, run more stable, the outer cover frame 48 that will illustrate here can be integrative-structure also can be that multiple metallic plate is formed by connecting, and the function that it not only has outer cover plays the effect of installing and supporting in addition.
In the utility model embodiment, be covered with cover cap 131 above described internal gear disc 13, the side 1311 of this cover cap 131 covers the interior groove of internal gear disc 13, and described cover cap 131 is fixed on pinion rotation dish 12 or outer cover frame 48.By adopting such scheme, internal gear disc 13 can well be protected, too increase the security of product in addition.

Claims (8)

1. an end face of flange boring beveling machine, it is characterized in that: include round turntable seat, jig arm, cutter mounting frame and advance and retreat cutter transmission mechanism thereof, wherein round turntable seat includes fixed disk, pinion rotation dish and internal gear disc, described fixed disk or internal gear disc are provided with transmission device, described pinion rotation dish rotates and is arranged on fixed disk, described internal gear disc is fixedly installed on fixed disk, the first gear on the output shaft of transmission device engages with pinion rotation dish, transmission operation driven gear rolling disc rotates on fixed disk, described pinion rotation dish is provided with mounting bracket, cutter mounting frame slip be arranged on mounting bracket, described jig arm is arranged on fixed disk, described advance and retreat cutter transmission mechanism is arranged on pinion rotation dish, advance and retreat cutter transmission mechanism includes the second gear, first worm screw, first worm gear, second worm screw, second worm gear, driving gear set and screw rod, wherein the second gear engages with internal gear disc and arranges, first worm screw and the second gear are coaxially fixed or are wholely set, described first worm screw and the first worm gear, described second worm screw and the first worm gear are coaxially fixed or are wholely set, second worm screw and the second worm gear, second worm gear can drive driving gear set transmission, driving gear set can drive bolt rotary, screw rod and cutter mounting frame threaded engagement, bolt rotary can move by carry its tools installing rack on screw rod.
2. end face of flange boring beveling machine according to claim 1, it is characterized in that: described advance and retreat cutter transmission mechanism also includes outer cover frame and clutch block, described driving gear set includes linkage gear and travelling gear, wherein linkage gear and the second worm gear are coaxially arranged, travelling gear and screw rod circumference are fixedly installed, engageablely between linkage gear with travelling gear to coordinate, arranged by connecting axle between described linkage gear and the second worm gear, connecting axle is arranged on the shaft centre line of linkage gear and the second worm gear, linkage gear is fixedly connected with connecting axle, connecting axle and the second worm gear circumference are rotatably assorted, described clutch block to be set on connecting axle and to coordinate with the fixing axial slip of connecting axle circumference, second worm gear is provided with fixture block or draw-in groove towards clutch block side, described clutch block is provided with draw-in groove or fixture block towards the second worm gear side, fixture block on second worm gear or draw-in groove with can realize clutch between the draw-in groove on clutch block or fixture block and coordinate.
3. end face of flange boring beveling machine according to claim 2, it is characterized in that: described linkage gear is provided with two groups and is respectively the first linkage gear and the second linkage gear, first linkage gear is different with the diameter of the second linkage gear, described travelling gear is provided with two groups and is respectively the first travelling gear and the second travelling gear, first travelling gear is different with the diameter of the second travelling gear, the axial slip of described travelling gear be arranged on screw rod, hingedly on described outer cover frame be provided with handle, the lower end of handle is connected with travelling gear, pull handle can realize driving gearshaft and move along screw axial, the linkage gear that travelling gear slippage on screw rod can realize the little travelling gear of diameter linkage gear engage or the diameter large travelling gear large with diameter little with diameter engages.
4. the end face of flange boring beveling machine according to Claims 2 or 3, it is characterized in that: described mounting bracket is provided with guide rail, described cutter mounting frame slippage is arranged on guide rail, described fixed disk is provided with roller around it, described pinion rotation dish is provided with the rail groove coordinated with roller, roller realizes being rotatably assorted in the rail groove of pinion rotation dish, described internal gear disc covers the top being arranged on the periphery groove of pinion rotation dish, pinion rotation dish inner top side shows out setting, and described mounting bracket is set up on pinion rotation dish inner top side face.
5. the end face of flange boring beveling machine according to Claims 2 or 3, it is characterized in that: described internal gear disc covers the top being arranged on the periphery groove of pinion rotation dish, pinion rotation dish inner top side shows out setting, described outer cover frame is fixedly installed on pinion rotation dish inner top side face, described first worm screw is fixedly installed on outer cover frame by clutch shaft bearing, the two ends of described first worm gear and the second worm screw are fixedly installed on outer cover frame by the third and fourth bearing, described second worm gear is arranged on outer cover frame by the 5th bearing, the connecting axle that described linkage gear is fixed is arranged on outer cover frame by the 6th bearing, described screw rod one end is located on outer cover frame by the 7th bearing bracket stand, the other end is located on mounting bracket by the 8th bearing bracket stand.
6. end face of flange boring beveling machine according to claim 4, it is characterized in that: described first worm screw is fixedly installed on outer cover frame by clutch shaft bearing, the two ends of described first worm gear and the second worm screw are fixedly installed on outer cover frame by the third and fourth bearing, described second worm gear is arranged on outer cover frame by the 5th bearing, the connecting axle that described linkage gear is fixed is arranged on outer cover frame by the 6th bearing, described screw rod one end is located on outer cover frame by the 7th bearing bracket stand, and the other end is located on mounting bracket by the 8th bearing bracket stand.
7. end face of flange boring beveling machine according to claim 5, is characterized in that: be covered with cover cap above described internal gear disc, and the side of this cover cap covers the interior groove of internal gear disc, and described cover cap is fixed on pinion rotation dish or outer cover frame.
8. end face of flange boring beveling machine according to claim 6, is characterized in that: be covered with cover cap above described internal gear disc, and the side of this cover cap covers the interior groove of internal gear disc, and described cover cap is fixed on pinion rotation dish or outer cover frame.
CN201420616607.8U 2014-10-23 2014-10-23 A kind of end face of flange boring beveling machine Withdrawn - After Issue CN204194868U (en)

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Application Number Priority Date Filing Date Title
CN201420616607.8U CN204194868U (en) 2014-10-23 2014-10-23 A kind of end face of flange boring beveling machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420616607.8U CN204194868U (en) 2014-10-23 2014-10-23 A kind of end face of flange boring beveling machine

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104439383A (en) * 2014-10-23 2015-03-25 浙江澳太机械制造有限公司 Boring beveling machine for end face of flange

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104439383A (en) * 2014-10-23 2015-03-25 浙江澳太机械制造有限公司 Boring beveling machine for end face of flange

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AV01 Patent right actively abandoned

Granted publication date: 20150311

Effective date of abandoning: 20170517

AV01 Patent right actively abandoned