CN101817032A - Spool material retractable feeder - Google Patents
Spool material retractable feeder Download PDFInfo
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- CN101817032A CN101817032A CN 201010138295 CN201010138295A CN101817032A CN 101817032 A CN101817032 A CN 101817032A CN 201010138295 CN201010138295 CN 201010138295 CN 201010138295 A CN201010138295 A CN 201010138295A CN 101817032 A CN101817032 A CN 101817032A
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Abstract
The invention discloses a spool material retractable feeder which comprises an electric control system, a bracket, a drive shaft system and a stretch shaft system, wherein the drive shaft system and the stretch shaft system are installed on the bracket, the drive shaft system comprises a drive shaft, the upper side of the bracket is connected with a door frame shaped support arm through a hinge, an opening is arranged at the front end of the support arm, a closed whiffletree is arranged at the back end of the support arm, the drive shaft system and the stretch shaft system are respectively installed on two door frames of the support arm, a lifting mechanism is articulated to the closed whiffletree of the support arm and the bottom of a stand, and the distance between the stretch shaft system and the hinge is smaller than the distance between the lifting mechanism and the hinge. By adopting a principle that the support arm applies a labor saving lever, a spool with larger weight can be lifted by using less action force.
Description
Technical field
The present invention relates to a kind of welding wire production equipment, particularly a kind of spool material retractable feeder.
Background technology
Be accompanied by the fast development of welding wire industry, welding wire manufacturer more and more payes attention to the non-cutting time of minimizing equipment operation to enhance productivity, reducing required time and the frequency of replacing I-beam wheel is one of them important means, so the I-beam wheel that retractable cable uses is increasing, the welding wire factory that has has used 1.5～2 tons I-beam wheel to carry out the retractable cable operation.At present, the picking-up of I-beam wheel generally in the following ways: at material retractable motor spindle fluting, be provided with the inclined-plane in the groove, the cylinder action utilizes the inclined-plane to hold up the supporting plate that is equipped with I-beam wheel on it, thereby holds up I-beam wheel.Existing unskilled labor character wheel weight and for 2 tons I-beam wheel nearly, is used above method certainly will significantly increase the size of cylinder, and then is increased the workload of fluting generally in 1 ton.There is some welding wire manufacturer not allow to destroy ground again, so the method for fluting is unworkable.
In addition, the retaining of existing material retractable machine locking cylinder is mainly taked two kinds of forms: a kind of is the wedge lock block mode, in this mode, utilize screw-nut body the retaining wedge to be pushed up on the sliding sleeve of lifting axe system by the operator, utilize the inclined-plane on the wedge to increase frictional force, guarantee that sliding sleeve can the production accident of I-beam wheel flywheel not take place because of cylinder leakage tester falls back; Another kind is a twin shaft cylinder retaining mode, the twin shaft cylinder that promptly utilizes a lifting axe system wherein expansion link is responsible for holding out against of I-beam wheel, another root expansion link of cylinder is stretched out by afterbody, retaining plate is installed on it, when cylinder I-beam wheel is held out against put in place after, retaining bolt and retaining thick stick that the operator will be installed on the casing put down, make the retaining bolt be positioned at retaining plate hole afterwards, after retaining thick stick on the retaining bolt is rotated in place, utilize the self-locking of screw thread to guarantee that the cylinder expansion link can not fall back because of gas leakage.
But in the running of material retractable machine, especially paying out machine is in continuous unwrapping wire process, because of the dilating effect of wire rod extruding for I-beam wheel weakens gradually, and the temperature of I-beam wheel is also because of the minimizing of wire rod, attenuate and constantly reducing, the height of I-beam wheel certainly will reduce than just going up when taking turns, so I-beam wheel can constantly dwindled in the unwrapping wire process gradually, the top interior degree of depth that the central tube of I-beam wheel embeds the top and driven axle system of driving shaft system also constantly reduces, when this degree of depth is reduced to certain value, the accident of I-beam wheel flywheel can take place in two top can't again I-beam wheel being withstood.But above-mentioned first kind of wedge lock piece is to be two-way pinning with lifting axe, pin the back lifting axe and be and two-wayly all can't move, and the mode that simple wedge is locked is in the continuous operation process of machine, also be easy to be shaken out by the vibration of machine self, second kind of twin shaft cylinder retaining mode also is to realize anti-retaining, i.e. one-way locking to lifting axe system.And above-mentioned two kinds of structures all can't solve above-mentioned insecure problem that holds out against.
Summary of the invention
The present invention provides a kind of spool material retractable feeder for solving the technical problem that exists in the known technology, only needs less action force just can rise the bigger I-beam wheel of weight.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is:
A kind of spool material retractable feeder, the driving shaft system and the lifting axe that comprise electric-control system, support and be installed on the described support are, described driving shaft is to comprise driving shaft, it is characterized in that, doorframe shape support arm has been connected through the hinge above the described support, the front end of described support arm is set to opening, and the rear end of described support arm is provided with the sealing whippletree; Described driving shaft system and lifting axe system are installed in respectively on two doorframes of described support arm, be hinged with elevating mechanism on the sealing whippletree of described support arm, the bottom-hinged of described elevating mechanism and described frame, the distance between described lifting axe system and the described hinge is less than the distance between described elevating mechanism and the described hinge.
Described lifting axe system and described driving shaft system are between described elevating mechanism and described hinge.
Described support is provided with base, offers notch on institute's base, and I-beam wheel supporting plate assembly is installed in the described notch.
Described elevating mechanism is a cylinder with lock.
Described driving shaft is to comprise frequency control motor and worm-gear speed reducer, and described frequency control motor is connected with described driving shaft by described worm-gear speed reducer.
Described lifting axe is to comprise jacking mechanism, described jacking mechanism comprise by coupling be packed on the described support arm hold out against cylinder, passive top and with described passive top affixed driven axle, it is indoor that described driven axle is installed in sleeve bearing, described driven axle is equipped with self-aligning roller bearing away from described passive top end, the outside of described sleeve bearing chamber is set with the sleeve affixed with described support arm, and described sleeve is connected by feather key with described sleeve bearing chamber; On the described expansion link that holds out against cylinder from holding out against the cylinder side beginning and gland, elastomeric element, locking nut are installed successively and take over a business near described, a described front end of taking over a business and a side adjacency of described self-aligning roller bearing outer ring, the described rear end of taking over a business and the front end adjacency of described gland, the opposite side of described self-aligning roller bearing outer ring abuts against on the positioning step of the indoor setting of described sleeve bearing, between described gland and described locking nut, described gland and described sleeve bearing chamber are affixed by cramping for described elastomeric element.
Described lifting axe is also to comprise stopping mechanism, the rear end face of described gland is provided with the inclined-plane, described stopping mechanism comprise with described support arm affixed and with the described vertically arranged retaining cylinder of cylinder that holds out against, be connected with the retaining bearing pin on the expansion link of described retaining cylinder, the leading section of described retaining bearing pin is processed with the inclined-plane that coincide with described gland rear end face ramp; Described coupling is provided with and the corresponding through hole of described retaining bearing pin.
On the described driven axle from described self-aligning roller bearing begin installed thrust bearing and deep groove ball bearing successively; Be equipped with on the described driving shaft and described passive axisymmetric self-aligning roller bearing, thrust bearing and deep groove ball bearing.
The range sensor of measuring material coil diameter is installed on the sealing whippletree of described support arm, described range sensor is the ultrasonic distance sensor, the center line of the described I-beam wheel of described ultrasonic distance sensor alignment, and it is vertical with this center line, described ultrasonic distance sensor by detect its with described material volume outermost layered material between distance, feed back the coil diameter signal that described material is rolled up to described electric-control system.
Described elastomeric element is a disk spring.
Advantage and good effect that the present invention has are: adopt support arm to use laborsaving lever principle and just can rise the bigger I-beam wheel of weight with less action force; Can slot on the ground; When because during the dimensional contraction of a variety of causes I-beam wheel, the retaining cylinder also can continue to advance the retaining bearing pin, guarantees that the retaining bearing pin holds out against gland constantly, and the accident of I-beam wheel flywheel can not take place; In addition, because the bevel angle of retaining bearing pin has been considered the friction self-locking factor,, can not cause lifting axe system to return the accident that the I-beam wheel flywheel takes place yet, thereby improve the security of producing even hold out against cylinder and the retaining cylinder all leaks gas.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the right view of Fig. 1;
Fig. 3 is the vertical view of Fig. 2.
Among the figure: 100, driving shaft system, 101, driving shaft, 102, frequency control motor, 103, worm-gear speed reducer;
200, I-beam wheel;
300, I-beam wheel supporting plate assembly;
400, lifting axe system, 401, sleeve, 402, gland, 403, coupling, 404, hold out against cylinder, 405, elastomeric element, 406, locking nut, 407, take over a business, 408, self-aligning roller bearing, 409, thrust bearing, 410, deep groove ball bearing, 411, the sleeve bearing chamber, 412, passive top, 413, driven axle, 414, the retaining cylinder, 415, the retaining bearing pin;
500, support, 501, base, 502, notch;
600, hinge;
700, support arm, 701, the sealing whippletree, 702, doorframe;
800, elevating mechanism;
900, range sensor.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
See also Fig. 1～Fig. 3, a kind of spool material retractable feeder of the present invention, comprise electric-control system (not shown), support 500 and be installed in driving shaft on the support 500 be 100 and lifting axe be 400, driving shaft is 100 to comprise driving shaft 101, the top of support 500 is connected with doorframe shape support arm 700 by hinge 600, the front end of support arm 700 is set to opening, and the rear end of support arm 700 is provided with sealing whippletree 701; Driving shaft be 100 and lifting axe be 400 to be installed in respectively on two doorframes 702 of support arm 700, be hinged with elevating mechanism 800 on the sealing whippletree 701 of support arm, the bottom-hinged of elevating mechanism and support 500, lifting axe be 400 and hinge 600 between distance less than the distance between elevating mechanism and the hinge.
Lifting axe be 400 and driving shaft be 100 between elevating mechanism 800 and hinge 600, make structure more stable, this structural design can reduce the load of hinge simultaneously.
Establish base 501 on the support 500, otch 502 on base 501.I-beam wheel supporting plate assembly 300 is installed in the notch 502, can destroys ground.
I-beam wheel supporting plate assembly 300 is same as the prior art, comprises supporting plate, is symmetrically installed with 4～8 ears seats on two ends, the supporting plate left and right sides, is coated with wheel shaft in each ears seat, on each wheel shaft roller is installed.Roller is positioned at the both sides, front and back of supporting plate.
Driving shaft is 100 to comprise frequency control motor 102 and worm-gear speed reducer 103, and frequency control motor 102 is connected with driving shaft 101 by worm-gear speed reducer 103, is convenient to speed governing, can reduce equipment volume.
Lifting axe is 400 to comprise jacking mechanism, jacking mechanism comprise by coupling 403 be packed on the support arm 700 hold out against cylinder 404, passive top 412 and with passive top affixed driven axle 413, driven axle is installed in the sleeve bearing chamber 411, driven axle 413 is equipped with self-aligning roller bearing 408 away from passive top 412 end, the outside of sleeve bearing chamber 411 is set with the sleeve 401 affixed with support arm 700, and sleeve and sleeve bearing chamber 411 are connected by feather key; Hold out against on the expansion link of cylinder 404 from gland 402, elastomeric element 405, locking nut 406 being installed successively and taking over a business 407 near holding out against the cylinder side beginning, one side adjacency of front end of taking over a business and self-aligning roller bearing 408 outer rings, take over a business 407 the rear end and the front end adjacency of gland 402, the opposite side of self-aligning roller bearing 408 outer rings abuts against on the positioning step that is provided with in the sleeve bearing chamber 411, between gland 402 and locking nut 406, gland 402 is affixed with sleeve bearing chamber 411 by cramping for elastomeric element 405.
Lifting axe is 400 also to comprise stopping mechanism, the rear end face of gland 402 is provided with the inclined-plane, stopping mechanism comprise with support arm 700 affixed and with hold out against cylinder 404 vertically arranged retaining cylinders 414, be connected with retaining bearing pin 415 on the expansion link of retaining cylinder, the leading section of retaining bearing pin 415 be processed with gland 402 rear end faces on the inclined-plane that coincide, inclined-plane; Coupling 403 is provided with the through hole corresponding with retaining bearing pin 415.
The bevel angle of retaining bearing pin 415 should be considered the friction self-locking factor, even hold out against cylinder 404 and retaining cylinder 414 all leaks gas, what the vibration during I-beam wheel 200 running brought is the pressure that 400 thrust also can finally be converted into through hole on 415 pairs of cylinder couplings 403 of retaining bearing pin to lifting axe, the retaining bearing pin 415 that causes of pressure and the stiction between the through hole should be greater than by compressing the thrust that retaining bearing pin 415 is released that the inclined-plane is transformed thus, the retaining bearing pin can not withdraw from, and is 400 to return the accident that I-beam wheel 200 flywheels take place thereby avoided lifting axe.It is higher that the design can guarantee to hold out against the reliability of I-beam wheel 200.
Begin installed thrust bearing 409 and deep groove ball bearing 410 successively of self-aligning roller bearing 408 on the driven axle 413; Self-aligning roller bearing, thrust bearing and deep groove ball bearing with driven axle 413 symmetries are installed on the driving shaft 101.Said structure can be avoided the locking problem that adopts common taper roll bearing to cause easily.
The range sensor 900 of measuring material coil diameter is installed on the sealing whippletree 701 of support arm 700, range sensor 900 is the ultrasonic distance sensor, the center line of ultrasonic distance sensor alignment I-beam wheel, and it is vertical with this center line, the ultrasonic distance sensor by detect its with material volume outermost layered material between distance, the coil diameter signal of rolling up to electric-control system feedback material.The coil diameter sensor measurement goes out coil diameter size at that time when the operator goes up wheel, and electric-control system is controlled the initial speed of drive motors according to the setting speed of coil diameter size and follow-up equipment, thereby realizes the speeds match between this machine and the follow-up equipment timely and accurately.
The coiled strip that twines on the above-mentioned I-beam wheel 200 can steel band also can be a wire rod.
Operating principle of the present invention is:
When the operator adorned I-beam wheel 200, cylinder with lock shrank, and drove support arm 700 and descended, and held out against cylinder 404 and shrank, and drove lifting axe and was 400 and return in the support arm 700; When support arm 700 descend put in place after, the operator with overhead traveling crane with I-beam wheel 200 hang driving shaft be 100 and lifting axe be position between 400, or manually I-beam wheel 200 is shifted onto above-mentioned position, this moment, the weight of I-beam wheel 200 was supported by supporting plate assembly 300; Hold out against cylinder 404 then and stretch out, promoting lifting axe is 400, and lifting axe system pushes away I-beam wheel 200, and I-beam wheel drags supporting plate assembly 300 and therewith moves, and finally by passive top 412 I-beam wheel 200 is withstood; Retaining cylinder 414 stretches out then, promotes the through hole that retaining bearing pin 415 passes on the coupling 403 its inclined-plane and gland 402 are held out against, and guarantees that lifting axe is 400 can not fall back; Last cylinder with lock stretches out, by support arm 700 and driving shaft be 100 and lifting axe be 400 I-beam wheel 200 to be lifted, that finishes I-beam wheel goes up the wheel operation.
The operation principle of above-mentioned jacking mechanism:
Holding out against cylinder 404 stretches out, drive with its expansion link affixed take over a business 407 reaches, take over a business 407 the front end outer ring by self-aligning roller bearing 408 and promote sleeve bearing chamber 411, sleeve bearing chamber 411 drives driven axles 413 and passive top 412 and moves ahead, and realizes holding out against of I-beam wheel 200; Hold out against cylinder 404 and shrink, drive with its expansion link affixed take over a business 407 after move, move after taking over a business 407 pulling glands 402, gland moves behind the pulling sleeve bearing chambers 411 402, sleeve bearing chamber 411 drives to retract behind the driven axles 413 and passive top 412 contracts.
Although in conjunction with the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (10)
1. spool material retractable feeder, the driving shaft system and the lifting axe that comprise electric-control system, support and be installed on the described support are, described driving shaft is to comprise driving shaft, it is characterized in that, doorframe shape support arm has been connected through the hinge above the described support, the front end of described support arm is set to opening, and the rear end of described support arm is provided with the sealing whippletree; Described driving shaft system and lifting axe system are installed in respectively on two doorframes of described support arm, be hinged with elevating mechanism on the sealing whippletree of described support arm, the bottom-hinged of described elevating mechanism and described frame, the distance between described lifting axe system and the described hinge is less than the distance between described elevating mechanism and the described hinge.
2. spool material retractable feeder according to claim 1 is characterized in that, described lifting axe system and described driving shaft system are between described elevating mechanism and described hinge.
3. spool material retractable feeder according to claim 1 is characterized in that described support is provided with base, offers notch on institute's base, and I-beam wheel supporting plate assembly is installed in the described notch.
4. spool material retractable feeder according to claim 1 is characterized in that, described elevating mechanism is a cylinder with lock.
5. spool material retractable feeder according to claim 1 is characterized in that, described driving shaft is to comprise frequency control motor and worm-gear speed reducer, and described frequency control motor is connected with described driving shaft by described worm-gear speed reducer.
6. spool material retractable feeder according to claim 1, it is characterized in that, described lifting axe is to comprise jacking mechanism, described jacking mechanism comprise by coupling be packed on the described support arm hold out against cylinder, passive top and with described passive top affixed driven axle, it is indoor that described driven axle is installed in sleeve bearing, described driven axle is equipped with self-aligning roller bearing away from described passive top end, the outside of described sleeve bearing chamber is set with the sleeve affixed with described support arm, and described sleeve is connected by feather key with described sleeve bearing chamber; On the described expansion link that holds out against cylinder from holding out against the cylinder side beginning and gland, elastomeric element, locking nut are installed successively and take over a business near described, a described front end of taking over a business and a side adjacency of described self-aligning roller bearing outer ring, the described rear end of taking over a business and the front end adjacency of described gland, the opposite side of described self-aligning roller bearing outer ring abuts against on the positioning step of the indoor setting of described sleeve bearing, between described gland and described locking nut, described gland and described sleeve bearing chamber are affixed by cramping for described elastomeric element.
7. spool material retractable feeder according to claim 6, it is characterized in that, described lifting axe is also to comprise stopping mechanism, the rear end face of described gland is provided with the inclined-plane, described stopping mechanism comprise with described support arm affixed and with the described vertically arranged retaining cylinder of cylinder that holds out against, be connected with the retaining bearing pin on the expansion link of described retaining cylinder, the leading section of described retaining bearing pin is processed with the inclined-plane that coincide with described gland rear end face ramp; Described coupling is provided with and the corresponding through hole of described retaining bearing pin.
8. spool material retractable feeder according to claim 6 is characterized in that, on the described driven axle from described self-aligning roller bearing begin installed thrust bearing and deep groove ball bearing successively; Be equipped with on the described driving shaft and described passive axisymmetric self-aligning roller bearing, thrust bearing and deep groove ball bearing.
9. spool material retractable feeder according to claim 1, it is characterized in that, the range sensor of measuring material coil diameter is installed on the sealing whippletree of described support arm, described range sensor is the ultrasonic distance sensor, the center line of the described I-beam wheel of described ultrasonic distance sensor alignment, and vertical with this center line, described ultrasonic distance sensor by detect its with described material volume outermost layered material between distance, feed back the coil diameter signal that described material is rolled up to described electric-control system.
10. spool material retractable feeder according to claim 6 is characterized in that, described elastomeric element is a disk spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101382950A CN101817032B (en) | 2010-04-02 | 2010-04-02 | Spool material retractable feeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101382950A CN101817032B (en) | 2010-04-02 | 2010-04-02 | Spool material retractable feeder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101817032A true CN101817032A (en) | 2010-09-01 |
| CN101817032B CN101817032B (en) | 2012-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101382950A Expired - Fee Related CN101817032B (en) | 2010-04-02 | 2010-04-02 | Spool material retractable feeder |
Country Status (1)
| Country | Link |
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| CN (1) | CN101817032B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102390756A (en) * | 2011-06-30 | 2012-03-28 | 河南恒星科技股份有限公司 | Pneumatic tightening device for spool |
| CN102431923A (en) * | 2011-09-07 | 2012-05-02 | 河南恒星科技股份有限公司 | Wheel arranging device for steel cord outer winding machine and wheel arranging method thereof |
| CN102601159A (en) * | 2011-07-18 | 2012-07-25 | 天津三英焊业股份有限公司 | Single-arm active winding and unwinding machine |
| CN102601160A (en) * | 2011-07-18 | 2012-07-25 | 天津三英焊业股份有限公司 | Reeling and unreeling machine tensioning device and double-arm initiative reeling and unreeling machine |
| CN102632106A (en) * | 2012-05-02 | 2012-08-15 | 天津三英焊业股份有限公司 | Retracting device, unreeling machine and reeling and unreeling machine |
| CN108263903A (en) * | 2018-01-31 | 2018-07-10 | 蚌埠兴力传感系统工程有限公司 | A kind of cable drum device |
| CN111661712A (en) * | 2020-05-21 | 2020-09-15 | 建科机械（天津）股份有限公司 | Driven shaft seat of spool |
| CN112064387A (en) * | 2020-09-15 | 2020-12-11 | 海城正昌工业有限公司 | Automatic group changing auxiliary device and method for double twister |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102390756A (en) * | 2011-06-30 | 2012-03-28 | 河南恒星科技股份有限公司 | Pneumatic tightening device for spool |
| CN102390756B (en) * | 2011-06-30 | 2012-12-19 | 河南恒星科技股份有限公司 | Pneumatic tightening device for spool |
| CN102601160B (en) * | 2011-07-18 | 2014-04-23 | 天津三英焊业股份有限公司 | Reeling and unreeling machine tensioning device and double-arm initiative reeling and unreeling machine |
| CN102601159A (en) * | 2011-07-18 | 2012-07-25 | 天津三英焊业股份有限公司 | Single-arm active winding and unwinding machine |
| CN102601160A (en) * | 2011-07-18 | 2012-07-25 | 天津三英焊业股份有限公司 | Reeling and unreeling machine tensioning device and double-arm initiative reeling and unreeling machine |
| CN102601159B (en) * | 2011-07-18 | 2014-01-29 | 天津三英焊业股份有限公司 | Single-arm active winding and unwinding machine |
| CN102431923B (en) * | 2011-09-07 | 2013-06-12 | 河南恒星科技股份有限公司 | Wheel arranging device for steel cord outer winding machine and wheel arranging method thereof |
| CN102431923A (en) * | 2011-09-07 | 2012-05-02 | 河南恒星科技股份有限公司 | Wheel arranging device for steel cord outer winding machine and wheel arranging method thereof |
| CN102632106A (en) * | 2012-05-02 | 2012-08-15 | 天津三英焊业股份有限公司 | Retracting device, unreeling machine and reeling and unreeling machine |
| CN108263903A (en) * | 2018-01-31 | 2018-07-10 | 蚌埠兴力传感系统工程有限公司 | A kind of cable drum device |
| CN111661712A (en) * | 2020-05-21 | 2020-09-15 | 建科机械（天津）股份有限公司 | Driven shaft seat of spool |
| CN111661712B (en) * | 2020-05-21 | 2023-12-05 | 建科机械（天津）股份有限公司 | Driven shaft seat of spool |
| CN112064387A (en) * | 2020-09-15 | 2020-12-11 | 海城正昌工业有限公司 | Automatic group changing auxiliary device and method for double twister |
| CN112064387B (en) * | 2020-09-15 | 2022-06-07 | 海城正昌工业有限公司 | Automatic group changing auxiliary device and method for double twister |
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| Publication number | Publication date |
|---|---|
| CN101817032B (en) | 2012-01-11 |
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