CN212397702U - Precise shape control equipment for thin-wall cylinder - Google Patents
Precise shape control equipment for thin-wall cylinder Download PDFInfo
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- CN212397702U CN212397702U CN202021025289.XU CN202021025289U CN212397702U CN 212397702 U CN212397702 U CN 212397702U CN 202021025289 U CN202021025289 U CN 202021025289U CN 212397702 U CN212397702 U CN 212397702U
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Abstract
The utility model provides a thin-wall cylinder precise shape control device, which comprises a rotary support table, a rotary support table and a control system, wherein the rotary support table is used for supporting a workpiece in the shape correction process and rotating the workpiece in the cooling shrinkage process; the precise shape control inner tire molds are uniformly distributed around the circle center of the rotary support table and are used for providing arc surfaces required during shape control and transmitting shape correction force during working; the hydraulic push cylinder is connected with the precise shape control inner mould and is used for precise shape control inner mould micro-distance movement; the guide device is arranged on a piston rod of the hydraulic push cylinder and is used for guiding the axial movement of the hydraulic push cylinder and positioning the guide direction; and the support is arranged on the ground in a circular ring shape by taking the circle center of the rotary support table as the center and is used for fixing the hydraulic push cylinder and the guide device. The utility model is used for to the accurate accuse shape of super large diameter thin wall barrel, accuse shape precision is high, and the wall thickness is not attenuate, and accurate accuse shape back residual stress is little, can simplify subsequent handling. Meanwhile, the taper of the inner mould is adjustable, and the inner mould is suitable for precise shape control of workpieces such as a cone and the like.
Description
Technical Field
The utility model relates to a thin wall barrel accuse shape equipment, especially the accurate accuse shape equipment of super large diameter thin wall barrel.
Background
The ultra-large diameter thin-wall cylindrical part is widely applied to the fields of petroleum and petrochemical industry, marine equipment and the like, and the processing mode can be performed by adopting a ring rolling and heat treatment mode. Irregular deformation can occur to the barrel in the cooling process after ring rolling and heat treatment, so that the size of the workpiece can not meet the use requirement. The commonly used method for correcting the thin-wall cylinder body comprises the modes of press point pressing and shape correction, shape correction of a four-roller rounding machine, shape expansion and shape correction and the like.
The shape correction method is a mechanical shape correction method, and basically meets the requirements of workpieces with smaller structure size, small deformation degree and low overall precision requirement. However, for the thin-walled cylindrical part with the ultra-large diameter, due to the existence of the principle defects of difficult correction of irregular deformation, reduced wall thickness of the cylindrical body, new deformation caused by overlarge stress and the like, and the difficulty in manufacturing corresponding processing equipment, the precise shape control of the cylindrical body is difficult to realize by using the method, and the requirements on the size and the performance of the product cannot be met.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses a main aim at provides one kind and is used for controlling shape equipment to the precision of super large diameter thin wall barrel, and accuse shape precision is high, and the wall thickness is not attenuate, and the precision is controlled and is appeared the advantage that residual stress is little after the shape, can simplify subsequent handling. Meanwhile, the taper of the inner mould is adjustable, and the inner mould is suitable for precise shape control of workpieces such as a cone and the like.
In order to achieve the purpose, the utility model is realized by the following technical scheme: a precise shape control device for a thin-wall cylinder comprises:
the rotary support table is used for supporting the workpiece in the shape correcting process and rotating the workpiece in the cooling shrinkage process;
the precise shape control inner tire molds are uniformly distributed around the circle center of the rotary support table and are used for providing arc surfaces required during shape control and transmitting shape correction force during working;
the hydraulic push cylinder is connected with the precise shape control inner mould and is used for precise shape control inner mould micro-distance movement;
the guide device is arranged on a piston rod of the hydraulic push cylinder and is used for guiding the axial movement of the hydraulic push cylinder and positioning the guide direction;
and the support is arranged on the ground in a circular ring shape by taking the circle center of the rotary support table as the center and is used for fixing the hydraulic push cylinder and the guide device.
According to the method, the hydraulic push cylinder is used for precisely and precisely controlling the micro-distance movement of the inner die, the shrinkage effect in the cooling process of a high-temperature workpiece is utilized, the adjustable circumferential inner die is adopted, the shrinkage range of the thin-wall cylindrical part is limited by controlling the position of the precisely controlled inner die with a specific radian, and the method has the remarkable advantages of high shape control precision, no reduction of wall thickness and small residual stress after precise shape control, and can simplify the subsequent processes. Meanwhile, the taper of the precise shape control inner mould is adjustable (the push-out distance of the upper inner mould and the lower inner mould is different, so that a cylindrical surface or a taper surface is formed in the vertical direction), and the precise shape control inner mould is suitable for precise shape control of workpieces such as a conical cylinder and the like.
Optionally, the support is of a truss structure, a plurality of grids for installing the guide device and the hydraulic push cylinder are arranged on the support, a plurality of layers of grids are distributed along the axial direction of the rotary support platform, and each layer of grids are uniformly distributed along the radial direction of the rotary support platform at intervals.
The hydraulic push cylinder support frame is connected into a whole by adopting a truss structure, and the installation and use precision of the guide device and the hydraulic push cylinder is ensured in the installation process; the multi-layer grids distributed in the axial direction can conveniently adjust the installation layer number of the guide device and the hydraulic push cylinder according to the height of the workpiece, and are used for meeting the requirement of controlling the shape of the workpieces with different heights.
Furthermore, the support comprises three circular cross beams which are arranged along the rotary support platform from inside to outside in the radial direction in the same horizontal direction, a plurality of upright posts which are vertically arranged on the ground are respectively connected with the cross beams, and the grids are formed by the connected cross beams and the upright posts.
By last, adopt the net that crossbeam and stand formed, satisfying under installation guider and the hydraulic pressure push away the jar demand, lighten the weight of whole support, simple structure also is convenient for guider and the installation of hydraulic pressure push away the jar.
Furthermore, horizontal beams are arranged between the two round cross beams positioned on the outer side and the upright column, and reinforcing ribs are arranged between the two vertical adjacent horizontal beams.
By last, the strengthening rib can further improve the overall stability of support, guarantees guider and hydraulic pressure push cylinder installation and use accuracy.
Optionally, the precise shape control inner tire mold is composed of a plurality of groups of high-rigidity inner tire molds, the radian of the tire surface of each inner tire mold is matched with the inner diameter of a workpiece to be processed, and the contraction range of the thin-wall cylindrical part is limited by the tire surface position of each inner tire mold.
The whole circumference is divided into a plurality of units, the inner tube molds are respectively arranged on each unit, the height of each unit is adjusted along with the height of the workpiece, and the contraction range of the thin-wall cylindrical part can be limited by controlling the tire surface position of the inner tube molds with specific radian in a multi-layer arrangement manner if necessary, so that the thin-wall cylindrical part meets the size requirement of the workpiece.
Optionally, the rotary support table includes: an annular turntable framework, a supporting seat, a workpiece supporting roller, a supporting wheel and a centering wheel,
the supporting wheels are uniformly arranged on the ground by taking the circle center of the rotary table framework as the center and are meshed with the track arranged at the bottom of the rotary table framework;
an annular supporting seat is fixed on the upper end face of the rotary table framework, and the workpiece supporting rollers are obliquely and uniformly arranged on the supporting seat around the circle center of the rotary table framework;
the centering wheels are uniformly arranged on the ground around the circle center of the rotary table framework and abut against the outer circumference of the rotary table framework, and are used for ensuring that the whole equipment rotates around the center of the rotary support table all the time during working;
the turntable framework is arranged on the support wheel and comprises a support wheel and a transmission system.
By last, the supporting wheel supports the central point at rotary supporting platform and puts, designs the bearing that the multiunit supporting wheel provided rotary supporting platform and work piece, when guaranteeing to be rolling friction, and the platform is a plane, satisfies the steady support of whole device. The centering wheel is fixed subaerial, and its center is the center of rotatory brace table, guarantees that whole equipment is rotatory around rotatory brace table center operation all the time at the during operation.
Furthermore, the transmission system comprises a chain arranged on the outer side of the rotary table framework, a chain wheel meshed with the chain and a speed reduction motor used for driving the chain wheel to rotate, the rotation of the workpiece rotating support table is realized through chain transmission, and the rotation of the rotating support table is provided with power in the detection process.
By last, for the rotatory power that provides of rotation supporting bench in the testing process, make things convenient for size detection device to detect work piece circularity and size, guarantee the work piece school shape size.
Optionally, the guide device further comprises a cylinder pushing support frame for mounting the guide device on the support, the cylinder pushing support frame is formed by a split structure made of high-strength structural steel, and the hydraulic cylinder pushing is buckled on the cylinder pushing support frame.
The inner tire mold and the guide device are fixed on the push cylinder support frame, so that the positioning of the guide position and the guide direction and the transmission of the shape correction force during working are realized.
Drawings
FIG. 1 is a schematic structural view of the thin-walled cylinder precision shape control device of the present invention;
fig. 2 is a top view of the present invention in fig. 1;
figure 3 is a side view of the present invention of figure 1;
FIG. 4 is a view A-A of FIG. 3 in accordance with the present invention;
fig. 5 is a schematic structural view of the rotary support table of fig. 1 according to the present invention;
fig. 6 is a schematic view of the connection structure of the inner tire membrane, the hydraulic push cylinder, the guiding device and the push cylinder support frame in fig. 1 according to the present invention.
Detailed Description
The following describes in detail a specific embodiment of the thin-walled cylinder precision shape control device according to the present invention with reference to fig. 1 to 6.
Example 1. The utility model discloses the accurate accuse shape equipment of thin wall barrel that preferred embodiment provided, including accurate accuse shape inner tube mould 1, hydraulic pressure push away jar 2, guider 3, support 4, rotary supporting bench 5 and control system, control system mainly realizes motion control through PIC through sensor monitoring hydraulic pressure position and action.
As shown in fig. 1 and 3, the precise shape control inner die 1 is composed of a plurality of groups of high-rigidity inner dies 11, and has the function of limiting the shrinkage range of the thin-wall cylindrical part by controlling the die surface position of the inner die 11 with a specific radian by utilizing the shrinkage effect in the cooling process of a high-temperature workpiece, so that the thin-wall cylindrical part meets the size requirement of the workpiece. In this embodiment, the tread surface is composed of 8 groups of 24 (or adjusted to 36 (12 groups))) high-rigidity inner dies 11, the radian of the inner dies is matched with the inner diameter of a processed workpiece, the inner dies can be cylindrical or tapered, and the inner dies 11 are machined by a post-casting machine, so that the good integral rigidity of the inner dies is ensured. In the processing procedure of the inner tube mould machine, the requirements for the diameter error of the inner mould 11, the roughness of the outer wall and the like are provided, so that the cylinder can freely contract without damaging the inner wall of the cylinder under the condition of ensuring the accurate shape of a workpiece when the cylinder is shaped and controlled. The inner mould 11 and the guiding device 3 are the main working parts of the shape control equipment and provide circular arc surfaces required by shape control. The design is that the whole circumference is divided into a plurality of units, an inner moulding bed 11 is respectively arranged for each unit, the height of each unit is adjusted along with the height of a workpiece, and the units can be arranged in a plurality of layers if necessary. The inner mold 11 is designed to give a sufficient margin between the inner molds in consideration of thermal expansion, inner mold operation, and the like. The inner mould 11 and the guide 3 are mounted as a unit on the support 4. During installation, the guide device 3 is installed from the rear side of the support 4, and the inner tire mold 11 is installed from the front side of the support 4, so that maintenance of each part of the equipment is facilitated.
As shown in fig. 1 and 6, the hydraulic push cylinder 2 is a digital servo hydraulic push cylinder, the hydraulic push cylinder 2 is fastened on a push cylinder support frame 31, the push cylinder support frame 31 is a part of the guide device 3, and the guide device 3 can be fixed on the push cylinder support frame 31 by using a bolt connection or welding mode, and specifically comprises a plurality of sets of digital servo hydraulic cylinders which are respectively installed behind the precise shape control inner die 1 and used for precisely controlling the micro-distance movement of the inner die 1 and realizing the position locking through hydraulic control.
As shown in fig. 6, the cylinder support frame 3 is made of high-strength structural steel in a split structure. The push cylinder support frame 3 is a support part of the inner mould 11, the guide device 3 and the hydraulic push cylinder 2 in the shape correcting equipment, and the guide device 3 is a guide steel sleeve made of thick heat-resistant steel, so that the hydraulic push cylinder is prevented from deflecting due to factors such as installation, abrasion and thermal expansion to cause arc surface deviation. The inner mould 11 and the guiding device 3 are fixed on the pushing cylinder supporting frame 3, so that the positioning of the guiding position and the guiding direction and the transmission of the shape correcting force during working are realized.
As shown in figure 1, the bracket 4 is formed by welding section steel. The cylinder pushing support frame 3 can be fixed on the support 4 in a bolt connection or welding mode, the support 4 adopts a truss structure, the cylinder pushing support frame 31 is connected into a whole, and the installation and use precision of the cylinder pushing support frame is required to be ensured in the installation process. In this embodiment, the support 4 has a plurality of grids 40 for installing the guiding device 3 and the hydraulic pushing cylinder 2, the grids 40 are distributed in multiple layers along the axial direction of the rotary supporting table 5, and each layer of grids 40 is uniformly distributed along the radial direction of the rotary supporting table 5 at intervals. More specifically, the support 4 includes three circular beams 401 arranged along the radial direction of the rotary support table 5 from inside to outside in the same horizontal direction, a plurality of columns 402 vertically arranged on the ground are respectively connected with the beams 401, and the grid 40 is formed by the connected beams 401 and columns 402. And, the horizontal beam 403 is arranged between the two round beams 401 and the upright post 402 which are positioned at the outer side, the reinforcing rib 404 is arranged between the two adjacent horizontal beams 403, the grid 40 formed by the beams 401 and the upright post 402 is adopted, the weight of the whole support 4 is reduced under the condition of meeting the requirements of installing the guide device 3 and the hydraulic push cylinder 2, the structure is simple, and the installation of the guide device 3 and the hydraulic push cylinder 2 is also convenient. The reinforcing ribs 404 can further improve the overall stability of the support 4 and ensure the installation and use precision of the guide device 3 and the hydraulic push cylinder 2.
As shown in fig. 3, 4, and 5, the rotary support table 5 is a workpiece support structure, and includes a support base 51, a workpiece support roller 52, an annular turntable frame 53, a support wheel 54, a centering wheel 55, and a transmission system 56. The rotary support table 5 meets the requirements of supporting the workpiece in the shape correction process and rotating the workpiece in the cooling shrinkage process, and the size of the workpiece after shape correction is ensured. The supporting wheels 54 are uniformly arranged on the ground by taking the circle center of the rotary table framework 53 as the center and meshed with a track arranged at the bottom of the rotary table framework 53, and a plurality of wheel sets can meet the bearing requirement of a workpiece; an annular supporting seat 51 is fixed on the upper end face of the rotary table framework 53, and the workpiece supporting rollers 52 are obliquely and uniformly arranged on the supporting seat 51 around the circle center of the rotary table framework 53; the centering wheels 55 are uniformly arranged on the ground around the circle center of the rotary table framework 53 and abut against the outer circumference of the rotary table framework 53, so that the rotation of the whole equipment during working is ensured to always operate around the center of the rotary table; the transmission system 56 is used for rotating the turntable framework 53 along the supporting wheel 54, and includes a chain 561 installed outside the turntable framework 53, a chain wheel 562 meshed with the chain 561, and a speed reduction motor 563 for driving the chain wheel 562 to rotate, and the rotation of the workpiece rotation supporting platform is realized through chain transmission, and is used for providing power for the rotation of the rotation supporting platform 5 in the detection process. The transmission system provides power for the rotation of the rotary supporting table 5 in the detection process, so that the roundness and the size of the workpiece can be conveniently detected by the size detection device, and the shape correction size of the workpiece can be ensured.
The workpiece is placed on workpiece supporting rollers 52 which are obliquely and uniformly arranged along the circle center of the rotary support table 5 in a hoisting mode, the workpiece supporting rollers 52 are fixedly connected onto a support seat 51 through bolts, the support seat 51 and a rotary table framework 53 are welded into a whole and supported by supporting wheels 54 which are fixed on the ground through bolts, a track is arranged at the bottom of the rotary table framework 53, the rotary support table 5 can move along the track, and a plurality of wheel sets can meet the load bearing of the workpiece. In the process of cooling and shrinking the workpiece, the bottom of the workpiece shrinks centripetally, the workpiece placed on the rotary support table 5 and the rotary support table 5 slide centripetally along the track as a whole, sliding friction is converted into rolling friction, the influence of friction on the shrinkage of the bottom of the workpiece is reduced, and the upper part and the bottom of the workpiece are guaranteed to shrink uniformly to the maximum extent.
More specifically, revolving stage skeleton 53 adopts rectangle side pipe welding to form, is steel rotary supporting platform shell all around, guarantees that rotary supporting platform forms a whole, and school shape equipment during operation, the weight of work piece and supporting seat 51 all is applyed on revolving stage skeleton 53. The supporting wheels 54 are supported at the central position of the rotary supporting platform 5, a plurality of groups of supporting wheels 54 are designed to provide bearing for the rotary supporting platform 5 and the workpiece, and the platform is a plane while rolling friction is guaranteed, so that stable supporting of the whole device is met. Centering wheel 55 is fixed subaerial, and its center is the rotation supporting bench center, guarantees that whole equipment rotation at the during operation is all the time around the operation of rotation supporting bench center.
The equipment is also provided with a size detection device for detecting parameters such as the position, the roundness, the flatness and the like of the workpiece, wherein the size detection device (not shown in the figure) is positioned outside the precise shape control inner mould and uniformly arranged around the center of the circle of the rotary support table 5. When the rotary support table rotates, the rotating workpiece is subjected to parameter measurement such as position, roundness, flatness and the like, and forms closed-loop control with the shape correction of the precise shape control inner forming die, so that the shape control precision is improved, and the product is prevented from being defective.
Example 2. The shape of the ultra-large thin-walled cylindrical part is controlled by the forward and backward movement of the inner mould.
Specification: the inner diameter of the cylinder is 12000-12500 mm, the wall thickness of the cylinder is 70-80 mm, and the height of the cylinder is 4000 mm.
Finishing precision: the roundness of the cylinder body is not more than +/-2.5 mm.
And (3) a shape correcting process:
the inner tire mold 11 is moved to the position of a circular arc with the center of the rotary support table 5 as the circle center and the diameter of the circular arc as the size of a workpiece by controlling the hydraulic push cylinder 2, the rotary support table 5 is rotated, and the position of the inner tire mold 11 is detected by using a size detection device, so that the roundness error is not more than +/-1.0 mm.
And a special lifting appliance is adopted to lift the ring-rolled red hot cylindrical workpiece to a thin-wall cylinder precise shape control device, and a size detection device is used to measure the roundness of the cylindrical workpiece, so that the center of the cylindrical workpiece is ensured to coincide with the center of the rotary supporting table 5.
And moving the inner mould 11 to be positioned at an arc position with the center of the rotary support table 5 as the center and the diameter as the size of the workpiece.
The cylindrical part is naturally cooled in air to room temperature, the workpiece naturally shrinks under the action of thermal expansion and cold contraction, the inner moulding bed 11 is utilized to restrain the radial shrinkage of the cylinder body during cooling, the radial shrinkage force of the cylinder body is changed into a normal force, the cylinder body is shrunk and deformed along the circumferential direction under the action of the normal force, when the cylinder body is cooled to the room temperature, the inner surface of the cylinder body is naturally attached to the outer surface of the inner moulding bed 11, and the cylinder body can meet the requirements of size and roundness of primary shaping.
The inner mould 11 is retracted inwards, so that the lifting appliance can transfer the workpiece conveniently.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope of the claims.
Claims (8)
1. Accurate accuse shape equipment of thin wall barrel, its characterized in that includes:
the rotary support table is used for supporting the workpiece in the shape correcting process and rotating the workpiece in the cooling shrinkage process;
the precise shape control inner tire molds are uniformly distributed around the circle center of the rotary support table and are used for providing arc surfaces required during shape control and transmitting shape correction force during working;
the hydraulic push cylinder is connected with the precise shape control inner mould and is used for precise shape control inner mould micro-distance movement;
the guide device is arranged on a piston rod of the hydraulic push cylinder and is used for guiding the axial movement of the hydraulic push cylinder and positioning the guide direction;
and the support is arranged on the ground in a circular ring shape by taking the circle center of the rotary support table as the center and is used for fixing the hydraulic push cylinder and the guide device.
2. The precise shape control equipment for the thin-wall cylinder body according to claim 1,
the support adopts a truss structure, a plurality of grids for installing the guide device and the hydraulic pushing cylinder are arranged on the support, a plurality of layers of grids are distributed along the axial direction of the rotary supporting platform, and each layer of grids are uniformly distributed along the radial direction of the rotary supporting platform at intervals.
3. The precise shape control equipment for the thin-wall cylinder body according to claim 2,
the support includes that same horizontal direction is followed three circular shape crossbeams that the radial from inside to outside of rotary supporting platform set up, many stands of vertical setting on ground meet with these crossbeams respectively, form through the crossbeam that meets and stand the net.
4. The precise shape control equipment for the thin-wall cylinder body according to claim 3,
horizontal beams are arranged between the two round cross beams positioned on the outer side and the upright column, and reinforcing ribs are arranged between the two vertically adjacent horizontal beams.
5. The precise shape control equipment for the thin-wall cylinder body according to claim 1,
the precise shape control inner tire mold consists of a plurality of groups of high-rigidity inner tire molds, the radian of the tire surface of the inner tire mold is matched with the inner diameter of a processed workpiece, and the contraction range of the thin-wall cylindrical part is limited by the tire surface position of the inner tire mold.
6. The precise shape control equipment for the thin-wall cylinder body according to claim 1,
the rotary support table includes: an annular turntable framework, a supporting seat, a workpiece supporting roller, a supporting wheel and a centering wheel,
the supporting wheels are uniformly arranged on the ground by taking the circle center of the rotary table framework as the center and are meshed with the track arranged at the bottom of the rotary table framework;
an annular supporting seat is fixed on the upper end face of the rotary table framework, and the workpiece supporting rollers are obliquely and uniformly arranged on the supporting seat around the circle center of the rotary table framework;
the centering wheels are uniformly arranged on the ground around the circle center of the rotary table framework and abut against the outer circumference of the rotary table framework, and are used for ensuring that the whole equipment rotates around the center of the rotary support table all the time during working;
the turntable framework is arranged on the support wheel and comprises a support wheel and a transmission system.
7. The precise shape control equipment for the thin-wall cylinder body according to claim 6,
the transmission system comprises a chain arranged on the outer side of the rotary table framework, a chain wheel meshed with the chain and a speed reduction motor used for driving the chain wheel to rotate, the rotation of the workpiece rotating support table is achieved through chain transmission, and power is provided for the rotation of the rotating support table in the detection process.
8. The precise shape control equipment for the thin-wall cylinder body according to claim 1,
the guide device further comprises a cylinder pushing support frame used for installing the guide device on the support, the cylinder pushing support frame is formed by high-strength structural steel in a split structure, and the hydraulic cylinder pushing is buckled on the cylinder pushing support frame.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021025289.XU CN212397702U (en) | 2020-06-05 | 2020-06-05 | Precise shape control equipment for thin-wall cylinder |
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| CN202021025289.XU CN212397702U (en) | 2020-06-05 | 2020-06-05 | Precise shape control equipment for thin-wall cylinder |
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| CN212397702U true CN212397702U (en) | 2021-01-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111822548A (en) * | 2020-06-05 | 2020-10-27 | 北京机电研究所有限公司 | Precise shape control equipment for thin-wall cylinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111822548A (en) * | 2020-06-05 | 2020-10-27 | 北京机电研究所有限公司 | Precise shape control equipment for thin-wall cylinder |
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Address after: Room 601, No. 18, Haidian District, Beijing, Beijing Patentee after: China National Machinery Institute Group Beijing Electromechanical Research Institute Co.,Ltd. Patentee after: Yantai moreI New Material Technology Co.,Ltd. Address before: Room 601, No. 18, Haidian District, Beijing, Beijing Patentee before: BEIJING Research Institute OF MECHANICAL & ELECTRICAL TECHNOLOGY Patentee before: Yantai moreI New Material Technology Co.,Ltd. |