CN219852751U - Camera adjusting device and centering system - Google Patents
Camera adjusting device and centering system Download PDFInfo
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- CN219852751U CN219852751U CN202320782558.4U CN202320782558U CN219852751U CN 219852751 U CN219852751 U CN 219852751U CN 202320782558 U CN202320782558 U CN 202320782558U CN 219852751 U CN219852751 U CN 219852751U
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 48
- 239000010959 steel Substances 0.000 claims abstract description 48
- 238000003466 welding Methods 0.000 claims abstract description 33
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 230000003993 interaction Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a camera adjusting device and a centering system, belongs to the technical field of welding equipment, and solves the technical problems of low adjusting precision and low adjusting efficiency of a traditional method for adjusting a camera of the centering system. The adjusting device is arranged on a platform of the welding machine and comprises two adjusting mechanisms and two cameras, the two adjusting mechanisms are oppositely arranged on two sides of a strip steel channel of the welding machine along a first direction, each adjusting mechanism comprises a camera support, a screw rod and a driving piece, the camera support is arranged on the platform in a sliding mode, and one camera is arranged on the camera support; the screw rod is arranged along the first direction and is in threaded connection with the camera support; the driving piece drives the screw rod to rotate clockwise and anticlockwise around the axis of the screw rod so as to enable the camera support to move reciprocally along the first direction. The utility model can improve the adjustment precision and the adjustment efficiency of the position of the camera in the adjustment centering system.
Description
Technical Field
The utility model belongs to the technical field of welding equipment, and particularly relates to a camera adjusting device and a centering system.
Background
The welding machine is an important device of the cold rolling production line and is used for carrying out welding operation on the tail and the head of the strip steel production line so as to realize continuous production of the strip steel production line. In order to ensure welding quality, the strip steel is prevented from deviating after welding, a centering system is needed to be used for centering the head and the tail of the strip steel during welding operation, daily maintenance is needed to be performed on the centering system in order to ensure centering accuracy, as the camera and the base thereof are too heavy, operators can knock the base by using an iron hammer to move the camera, the moving path of the base is not easy to control, the adjusting accuracy is low, the operators are required to repeatedly adjust, and the working efficiency is low.
Disclosure of Invention
The utility model aims to at least solve the technical problems of low adjustment precision and low adjustment efficiency of the existing camera adjustment method of the centering system to a certain extent.
The technical scheme of the utility model is as follows:
the utility model provides a camera adjusting device, sets up in the platform of welding machine, adjusting device includes two guiding mechanism and two cameras, two guiding mechanism along a direction set up relatively in the both sides of the belted steel passageway of welding machine, guiding mechanism includes:
the camera support is arranged on the platform in a sliding manner, and is provided with one camera;
the screw rod is arranged along the first direction and is in threaded connection with the camera support;
the driving piece drives the screw rod to rotate clockwise and anticlockwise around the axis of the screw rod so as to enable the camera support to move reciprocally along the first direction.
In some embodiments, the adjusting device further comprises a sliding rail, the sliding rail is arranged on the platform, the length direction of the sliding rail is parallel to the first direction, a sliding groove is formed in the bottom end of the camera support, and the sliding groove is in sliding fit with the sliding rail.
In some embodiments, the camera mounts of both of the adjustment mechanisms are in sliding engagement with the same slide rail.
In some embodiments, the drive member comprises a motor and a coupling, an output shaft of the motor being connected to the lead screw via the coupling.
In some embodiments, the motor is a hydraulic motor.
A centering system is arranged on a welding machine and comprises the camera adjusting device.
In some embodiments, the camera is located above the strip steel channel, the signal light source is located below the strip steel channel, and the calibration member is detachably disposed on the welding machine and located between the signal light source and the camera.
In some embodiments, the welding machine is provided with a clamp, the clamp is provided with at least one positioning hole, the calibration piece is provided with a through hole corresponding to the positioning hole, the calibration piece is connected with the positioning hole and the through hole through a pin shaft so as to be detachably arranged in the clamp, and the central line of the calibration piece and the central line of the signal light source are positioned on the same vertical plane.
In some embodiments, the centering system further comprises:
the controller is connected with the camera and used for acquiring image information obtained by the camera;
and the display module is connected with the controller and used for displaying the image information.
In some embodiments, the centering system further comprises:
the interaction module is connected with the controller and used for responding to user operation to generate a control instruction and sending the control instruction to the controller, wherein the control instruction comprises target steering and target turns;
the controller is used for controlling the driving piece to drive the screw rod to rotate according to the target steering direction and the target circle number according to the control instruction.
In some embodiments of the present utility model, in some embodiments,
the embodiment of the utility model has at least the following beneficial effects:
according to the technical scheme, the camera adjusting device disclosed by the utility model drives the screw rod to rotate clockwise and anticlockwise through the driving piece so as to enable the camera support to reciprocate in the first direction, so that the adjustment of the position of the camera is realized, the difficulty in adjusting the position of the camera is reduced, the high degree of fit of the screw rod and the camera support in threaded connection is utilized to provide good stability for the movement of the camera along with the camera support, and the adjustment efficiency and the adjustment precision of the position of the camera are high; meanwhile, the centering system disclosed by the utility model improves the adjusting precision and the adjusting efficiency of adjusting the position of the camera through the adjusting device, improves the precision of the centering system in the welding operation of a welding machine, and further can improve the welding quality of strip steel.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of an adjusting device according to an embodiment of the present utility model;
the marks in the figure: the camera comprises a 1-camera, a 2-camera support, a 3-screw, a 4-motor, a 5-coupler and a 6-slide rail.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The utility model is described below with reference to specific embodiments in conjunction with the accompanying drawings:
as shown in fig. 1, the present embodiment provides a camera adjustment device, which is disposed on a platform of a welder, the welder is further provided with a strip steel channel for conveying strip steel, and the strip steel moves in the strip steel channel to a welding operation area of the welder; the centering system comprises at least one adjusting device for respectively acquiring whether the strip steel in the strip steel channels at different positions is centered or not through different adjusting devices.
Referring to fig. 1, the adjusting device includes two adjusting mechanisms and two cameras 1, the cameras are disposed on the adjusting mechanisms, the adjusting mechanisms are used for changing positions of the cameras relative to the strip steel channel, specifically, the two adjusting mechanisms are disposed on two sides of the strip steel channel along a first direction, the first direction is perpendicular to a moving direction of the strip steel, wherein the perpendicular means that an included angle between the first direction and the moving direction of the strip steel is within 90 ° ± 10 °.
Referring to fig. 1, the adjusting mechanism includes a camera support 2, a screw 3 and a driving member, the camera support 2 is disposed on the platform, the top surface of the platform is planar, and the bottom surface of the camera support 2 is attached to the top surface of the platform, so that the camera support 2 can slide on the platform. The single camera support 2 is provided with one camera 1, and the camera 1 moves along with the camera support 2, and of course, the two cameras 1 are also arranged oppositely to acquire the position information of the strip steel.
The screw rod 3 is arranged along the first direction and is in threaded connection with the camera support 2, a threaded hole matched with the screw rod 3 in threads can be formed in the middle of the camera support, a nut matched with the screw rod 3 in threads can be directly arranged on the side wall of the camera support 2, namely, the axis of the threaded hole or the axis of the threaded hole of the nut is also arranged along the first direction, after the screw rod 3 is in threaded connection with the threaded hole or the nut, the screw rod 3 and a driving piece are kept from displacement compared with a platform, the driving piece drives the screw rod 3 to rotate around the axis of the screw rod 3, at this time, under the influence of the dead weights of the camera 1 and the camera support 2, the bottom surface of the camera support 2 is kept in contact with the top surface of the platform, relative displacement is generated between the screw rod 3 and the camera support 2, and the driving piece drives the screw rod 3 to rotate in the forward and backward direction, so that the reciprocating movement of the camera support 2 in the first direction can be realized, and the position adjustment of the camera 1 can be realized.
Above, the camera adjusting device of this embodiment drives the lead screw 3 through the driving piece and rotates in the same direction as the contrary so that camera support 2 is in the reciprocating motion of first direction, realizes the adjustment to camera 1 position, has reduced the degree of difficulty of adjusting camera 1 position, utilizes lead screw 3 and camera support 2 threaded connection's high degree of fit, provides good stability for camera 1 moves along with camera support 2, and is high to camera 1 position's adjustment efficiency and adjustment accuracy height.
Further, referring to fig. 1, the adjusting device further includes a sliding rail 6, the sliding rail 6 is disposed on the top surface of the platform, the length direction of the sliding rail 6 is parallel to the first direction, wherein, the parallel means that an included angle between the length direction of the sliding rail 6 and the first direction is smaller than 5 °, a sliding groove is disposed at the bottom end of the camera support 2, the sliding groove is in sliding fit with the sliding rail 6, the moving direction of the camera support 2 is limited by the matching of the sliding groove and the sliding rail 6, and then the stability of the camera support 2 during moving is improved, correspondingly, errors of the camera support 2 during moving can be reduced, and the adjusting precision of the adjusting device is further improved. Each adjusting structure can be matched with one slide rail 6, and also referring to fig. 1, two camera supports 2 can be in sliding fit with the same slide rail 6, so as to further reduce errors between the two adjusting mechanisms.
In this embodiment, the adjusting device may include at least one bearing seat, the lead screw 3 is connected with an inner ring of the bearing seat, at this time, the driving member may be a wheel disc handle, and the wheel disc handle is fixedly connected with one end of the lead screw 3, so that an operator can drive the lead screw 3 to rotate by rotating the wheel disc handle. Preferably, referring to fig. 1, in the present embodiment, the driving member includes a motor 4 and a coupling 5, an output shaft of the motor 4 is connected to the screw 3 through the coupling 5, the adjustment accuracy can be improved by driving the screw 3 by the motor 4, and the offset between the output shaft of the motor 4 and the screw 3 due to manufacturing and/or mounting inaccuracy, deformation or thermal expansion during operation, etc. can be compensated by the coupling 5, and at the same time, impact is alleviated and vibration is absorbed, the accuracy of rotation of the screw 3 driven by the motor 4 is improved, and the service life of the screw 3 is prolonged.
Preferably, the motor 4 is a hydraulic motor, the hydraulic motor can rotate forward and backward, and can be started and stopped rapidly and frequently, the response speed is high, and the position adjustment precision of the camera support 2 is high.
Based on the same inventive concept, the embodiment also provides a centering system, wherein the centering system is arranged on the welding machine and is used for acquiring whether the positions of the tail of one strip steel to be welded and the head of the other strip steel in the strip steel channel of the welding machine are centered or not, so that the two strip steels are respectively a first strip steel and a second strip steel, the strip steel channel comprises an upper channel for placing the first strip steel and a lower channel for placing the second strip steel, and a gap for welding operation of the welding machine is reserved between the upper channel and the lower channel.
The centering system includes the camera adjusting device that this embodiment provided, adjusts camera 1 position through adjusting device fast and accurately for two cameras 1 can be centered fast, and then reduces the time that overhauls centering system and spends, improves the operating efficiency of whole welding machine, simultaneously, centering system is high in the accuracy of welding machine operation in-process, can improve the welding quality of belted steel.
Further, the centering system of the embodiment further comprises a signal light source and a calibration member. The top of every camera support 2 in the adjusting device all is provided with a camera 1, and camera 1 is located the top of belted steel passageway, and signal light source is located the below of belted steel passageway, and when there is not the shelter from the thing between signal light source and the camera 1, the light of signal light source output can directly be obtained by camera 1. The width of the signal light source is larger than the maximum width of the strip steel, namely, the detected strip steel can be obtained by obtaining the widths of the signal light sources on two sides of the strip steel, and the camera 1 needs to be moved to ensure that the camera 1 can obtain the signal light source in consideration of the fact that the welding machine can weld strip steel with different widths in the operation engineering.
Therefore, the calibration piece can be detachably arranged between the welding machine and the signal light source and the camera 1 and used for replacing strip steel, the central line of the calibration piece and the central line of the strip steel channel are positioned on the same vertical plane, the calibration piece can be plate-shaped or rod-shaped, the width of the calibration piece can be customized individually according to the width of the strip steel to be welded, and the width of the calibration piece is not smaller than the maximum width of the steel plate to be welded. The driving part of the adjusting device rotates the lead screw 3 to move the cameras 1, so that the two cameras 1 can be aligned with each other compared with the calibration part rapidly and accurately, and the detection precision of the alignment system on whether the first strip steel and the second strip steel are aligned in the subsequent welding operation is improved.
The welding machine is provided with a clamp, the clamp is used for adjusting the position of strip steel in welding operation, and when welding operation is not performed, the clamp is located at the center line of a strip steel channel, therefore, in the embodiment, the clamp is provided with at least one positioning hole, the calibration piece is provided with a through hole corresponding to the positioning hole, the calibration piece is detachably arranged on the clamp through a pin shaft, the center line of the calibration piece and the center line of the signal light source are located on the same vertical plane, the strip steel with the center line not offset is simulated through the calibration piece, the camera 1 obtains the signal light source at the moment, namely, the position relation of the camera 1 compared with the calibration plate can be obtained, and an operator can correspondingly adjust according to the obtained position relation, so that the two cameras 1 are centered, and the two cameras 1 can obtain the signal light source.
Further, the centering system further comprises a controller and a display module, wherein the camera 1 and the display module are both connected with the controller, the controller acquires image information obtained by the camera 1, the display module is used for displaying the image information, namely, the image information obtained by the camera 1 is transmitted to the controller, the controller processes the received image information and transmits the processed image information to the display module so as to visualize the image information obtained by the camera 1, thereby facilitating an operator to know whether the two cameras 1 are centered or not, specifically, when the two cameras 1 can acquire the image information about signal light sources, and the widths of the signal light sources on two sides of the obtained image information display calibration plate are consistent, the two cameras 1 are considered to be centered; if the image information obtained by the two cameras 1 shows that the width of the signal light source on one side of the calibration plate is larger than that on the other side of the calibration plate, the two cameras 1 are considered to be not centered, and an operator can adjust the positions of the two cameras 1 through the adjusting device until the cameras 1 are centered according to the visualized image information.
In order to further facilitate the operator to adjust the position of the camera 1, in this embodiment, the centering system further includes an interaction module, where the interaction module is connected to the controller, and is configured to generate a control instruction in response to a user operation, and send the control instruction to the controller, where the control instruction includes a target steering and a target number of turns.
The target steering comprises clockwise rotation and anticlockwise rotation, and under the condition that the screw direction of the screw thread of the screw rod 3 is certain, the driving piece drives one screw rod 3 to rotate clockwise or anticlockwise, namely, one camera 1 is driven to be close to the central line of the strip steel channel or far away from the central line of the strip steel channel, when the position of one camera 1 meets the requirement, the other camera 1 is driven to move to the two cameras 1 for centering, and the target steering can be obtained at the moment. Similarly, under the condition that the pitch of the screw rod 3 is fixed, the distance of one circle of rotation of the screw rod 3 is also known, the distance of one camera 1 needing to be displaced along the first direction can be obtained by obtaining the difference value of the widths of the signal light sources in the image information obtained by the two cameras 1, and the target circle number can be obtained by calculation.
After the target steering and the target turns are obtained, the controller is used for controlling the driving piece to drive the screw rod to rotate the target turns according to the target steering according to the control instruction, and therefore centering of the two cameras 1 can be achieved.
Above, can realize that the operating personnel remote control centers the position of two cameras 1 in the system through controller, display module and interactive module, reduce the operation degree of difficulty, control accuracy is high simultaneously.
As an alternative implementation manner, a red fluorescent tube may be used to provide a signal light source, and the camera 1 is equipped with a CCD chip for detecting a scene brightness curve by using an FZS1024 image sensor, and the interaction module is a touch screen.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
It should be noted that all the directional indicators in the embodiments of the present utility model are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.
In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a camera adjusting device, its characterized in that sets up in the platform of welding machine, adjusting device includes two guiding mechanism and two cameras, two guiding mechanism along a direction set up relatively in the both sides of the belted steel passageway of welding machine, guiding mechanism includes:
the camera support is arranged on the platform in a sliding manner, and is provided with one camera;
the screw rod is arranged along the first direction and is in threaded connection with the camera support;
the driving piece drives the screw rod to rotate clockwise and anticlockwise around the axis of the screw rod so as to enable the camera support to move reciprocally along the first direction.
2. The camera adjustment device according to claim 1, further comprising a slide rail, the slide rail being disposed on the platform, a length direction of the slide rail being parallel to the first direction, a slide groove being provided at a bottom end of the camera support, the slide groove being in sliding engagement with the slide rail.
3. The camera adjustment device of claim 2, wherein the camera mounts of both of the adjustment mechanisms are in sliding engagement with the same slide rail.
4. The camera adjustment device according to claim 1, characterized in that the driving member includes a motor and a coupling, and an output shaft of the motor is connected to the screw through the coupling.
5. The camera adjustment device of claim 4, wherein the motor is a hydraulic motor.
6. A centering system, characterized in that it is provided to a welder, said centering system comprising a camera adjustment device according to any one of claims 1-5.
7. The centering system of claim 6, further comprising a signal light source and a calibration member, wherein the camera is positioned above the strip channel, the signal light source is positioned below the strip channel, and the calibration member is removably positioned between the welder and the signal light source.
8. The centering system of claim 7, wherein the welder is provided with a clamp, the clamp is provided with at least one positioning hole, the calibration member is provided with a through hole corresponding to the positioning hole, the calibration member is connected with the positioning hole and the through hole through a pin shaft so as to be detachably arranged on the clamp, and a center line of the calibration member and a center line of the signal light source are located on the same vertical plane.
9. The centering system of claim 7, further comprising:
the controller is connected with the camera and used for acquiring image information obtained by the camera;
and the display module is connected with the controller and used for displaying the image information.
10. The centering system of claim 9, further comprising:
the interaction module is connected with the controller and used for responding to user operation to generate a control instruction and sending the control instruction to the controller, wherein the control instruction comprises target steering and target turns;
the controller is used for controlling the driving piece to drive the screw rod to rotate according to the target steering direction and the target circle number according to the control instruction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320782558.4U CN219852751U (en) | 2023-04-11 | 2023-04-11 | Camera adjusting device and centering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320782558.4U CN219852751U (en) | 2023-04-11 | 2023-04-11 | Camera adjusting device and centering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219852751U true CN219852751U (en) | 2023-10-20 |
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| CN202320782558.4U Active CN219852751U (en) | 2023-04-11 | 2023-04-11 | Camera adjusting device and centering system |
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| CN (1) | CN219852751U (en) |
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- 2023-04-11 CN CN202320782558.4U patent/CN219852751U/en active Active
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Address after: 064400 No. 025 Zhao'an Street, Qian'an Economic Development Zone, Tangshan City, Hebei Province Patentee after: Shougang Zhixin Electromagnetic Materials (Qian'an) Co.,Ltd. Country or region after: China Address before: No. 025 Zhao'an Street, Qian'an Economic Development Zone, Tangshan City, Hebei Province, 064400 Patentee before: SHOUGANG ZHIXIN QIAN'AN ELECTROMAGNETIC MATERIALS Co.,Ltd. Country or region before: China |