CN112193912A - Cable partial discharge test platform testing arrangement - Google Patents
Cable partial discharge test platform testing arrangement Download PDFInfo
- Publication number
- CN112193912A CN112193912A CN202011202810.7A CN202011202810A CN112193912A CN 112193912 A CN112193912 A CN 112193912A CN 202011202810 A CN202011202810 A CN 202011202810A CN 112193912 A CN112193912 A CN 112193912A
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- Prior art keywords
- partial discharge
- discharge test
- test platform
- cable
- adjusting
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- 238000012360 testing method Methods 0.000 title claims abstract description 52
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 20
- 239000003381 stabilizer Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 description 16
- 230000033001 locomotion Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H49/00—Unwinding or paying-out filamentary material; Supporting, storing or transporting packages from which filamentary material is to be withdrawn or paid-out
- B65H49/18—Methods or apparatus in which packages rotate
- B65H49/20—Package-supporting devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
- B65H75/18—Constructional details
- B65H75/24—Constructional details adjustable in configuration, e.g. expansible
- B65H75/242—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages
- B65H75/248—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages expansion caused by actuator movable in axial direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/32—Optical fibres or optical cables
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
The embodiment of the invention discloses a testing device for a cable partial discharge test platform, which comprises a bottom plate, a movable support and a fixed support, wherein the bottom plate is installed on the ground through bolts, and the movable support and the fixed support are arranged on the bottom plate in a mirror image manner; the expansion assembly comprises a bidirectional screw rod arranged between the movable support and the fixed support through a bearing and two thread seats sleeved on the bidirectional screw rod through symmetrical threads.
Description
Technical Field
The embodiment of the invention relates to the technical field of cables, in particular to a testing device for a cable partial discharge test platform.
Background
The cable is an electric energy or signal transmission device, generally consists of several or several groups of conducting wires, including DC cable and AC cable, the partial discharge is the penetrating discharge which is generated between electrodes under the action of high electric field intensity in the insulating medium of high-voltage equipment, the discharge is only existed in the insulating partial position, and does not form a penetrating channel immediately, the partial discharge of the cable can generate a series of physical phenomena and chemical changes of light, sound, electric and mechanical vibration and the like in the internal and peripheral space of the electric equipment, and the insulating state in the cable can be detected according to the phenomena.
The cable need carry out the partial discharge test when detecting, the cable is connected the slow motion on two cable drums when utilizing the traction method experimental, because experimental needs, need detect different cables, need to install different cable drums on the support promptly, but current cable drum support receives the influence in pivot diameter and cable drum installation aperture, make to have the gap between cable drum and the pivot, make cable drum rock when the unwrapping wire, lead to the cable to rock, influence the state of cable in detection device, thereby influence the testing result of partial discharge test, therefore, need design a cable partial discharge test platform testing arrangement, be used for solving current cable drum and producing the problem that rocks the influence test result when carrying out the cable partial discharge test.
Disclosure of Invention
Therefore, the embodiment of the invention provides a testing device for a cable partial discharge test platform, which solves the problem that the accuracy of a partial discharge test result is influenced by the shaking of a cable reel when the cable reel is paid off due to the installation gap between the cable reel and a support when the existing cable is subjected to a partial discharge test.
In order to achieve the above object, an embodiment of the present invention provides the following:
a cable partial discharge test platform testing device comprises a bottom plate, a movable support and a fixed support, wherein the bottom plate is installed on the ground through bolts, the movable support and the fixed support are arranged on the bottom plate in a mirror image mode, an expansion assembly is arranged between the movable support and the fixed support, and a cable reel is installed on the expansion assembly;
the extension subassembly includes that two screw thread seats on two-way screw rod are cup jointed through two-way screw rod and the symmetry screw thread of bearing installation between movable support and fixed bolster, the one end of two-way screw rod runs through fixed bolster to the outside and is connected with driving motor, every equal symmetry swing joint has a plurality of bracing piece on the screw thread seat, a plurality of directional spout has been seted up on the lateral wall of fixed bolster, and is close to the one end sliding connection of a plurality of bracing piece on the screw thread seat of fixed bolster is in the directional spout that corresponds, one of them bracing piece and another on the screw thread seat equal common fixed swing joint has the extension pole between the bracing piece that corresponds on the screw thread seat.
As a preferable scheme of the invention, the top of the bottom plate is provided with a movable sliding chute for the movable support to do linear motion along the axis of the bidirectional screw, a driving screw connected with the bottom of the movable support through a thread is arranged in the movable sliding chute through a bearing, and one end of the driving screw penetrates through the side wall of the bottom plate and is connected with a rotating handle.
As a preferable scheme of the invention, the movable support comprises a sliding seat in threaded connection with the driving screw and a first connecting seat movably connected to the top of the sliding seat, two locking bolts for locking the position of the first connecting seat are symmetrically arranged at the tops of two opposite side walls on the sliding seat, and an adjusting assembly connected with the bidirectional screw is arranged on the first connecting seat.
As a preferable scheme of the present invention, the adjusting assembly includes an adjusting groove disposed at the top of the first connecting base and an adjusting screw vertically installed in the adjusting groove through a bearing, the adjusting screw is threadedly connected with a u-shaped plate slidably connected to the adjusting groove, the top of the adjusting screw penetrates through the bottom of the u-shaped plate and is fixedly connected with a crank, and the u-shaped plate is fixedly connected with a connecting plate connected to the bidirectional screw.
As a preferred scheme of the present invention, the fixing bracket includes a second connecting seat fixedly connected to the bottom plate, a plane where a top of the second connecting seat is located and a plane where a top of the first connecting seat is located are located on a horizontal plane, the second connecting seat is also provided with an adjusting assembly, and the directional sliding groove is provided on the corresponding connecting plate.
In a preferred embodiment of the present invention, two u-shaped plates are provided with scales for marking an adjustment distance, and zero-scale lines of the scales are provided on the tops of the u-shaped plates.
As a preferable scheme of the invention, two stabilizer bars inserted into the u-shaped plate are fixedly connected in the adjusting groove, and the two stabilizer bars are symmetrically arranged on two sides of the adjusting screw.
As a preferred scheme of the present invention, an auxiliary sliding groove identical to the directional sliding groove is formed on a side wall of the connecting plate on the movable support, and one end of the plurality of support rods far away from the fixed support is slidably connected in the auxiliary sliding groove.
As a preferable scheme of the invention, the maximum distance between the extension rod and the threaded seat is smaller than the length of the supporting rod.
In a preferred embodiment of the present invention, the outer surface of the extension rod is curved, and the curved surface of the extension rod is a rough surface.
The embodiment of the invention has the following advantages:
the invention utilizes the movement of the threaded seat on the bidirectional screw rod to control the installation radius of the expansion rod, can be completely matched with the installation aperture of the cable reel, and controls the cable reel to be still by the friction force generated by the support of the support rod when the expansion rod is abutted against the inner part of the installation hole of the cable reel, so that no installation hole exists when the cable reel is installed, and the phenomenon that the cable reel shakes when being paid off is avoided to influence the accuracy of a local discharge test result.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a schematic structural diagram of a testing device of a cable partial discharge testing platform according to an embodiment of the present invention;
fig. 2 is a schematic side structure diagram of a testing device of a cable partial discharge test platform according to an embodiment of the present invention.
In the figure:
1-a bottom plate; 2-a movable support; 3-fixing the bracket; 4-an expansion component; 5-cable reel; 6-movable sliding chute; 7-driving the screw; 8-turning handle; 9-graduation;
201-sliding seat; 202-a first connection mount; 203-an adjustment assembly; 204-a locking bolt; 205-an adjustment tank; 206-adjusting screw; 207-U-shaped plate; 208-a crank; 209-connecting plate; 210-a stabilizer bar; 211-auxiliary chute;
401-bidirectional screw; 402-a threaded seat; 403-a drive motor; 404-a directional chute; 405-an extension rod; 406-directional chute.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the invention provides a testing device for a cable partial discharge test platform, which comprises a bottom plate 1 installed on the ground through bolts, a movable support 2 and a fixed support 3 arranged on the bottom plate 1 in a mirror image manner, wherein an expansion component 4 is arranged between the movable support 2 and the fixed support 3, and a cable reel 5 is installed on the expansion component 4;
When the cable partial discharge test device is used, when the cable is subjected to a partial discharge test, the cable is led out from one cable drum 5 and passes through the insulating liquid to the other cable drum, and the partial discharge test of the cable is performed in the insulating liquid.
When the cable drum 5 is installed, the cable drum 5 is sleeved on the expansion component 4, and the cable drum 5 is an existing tool with a mounting hole and used for coiling a cable.
A circular mounting shaft is formed between the extension rods 405, the mounting radius of the extension rods 405 is smaller than the mounting aperture on the cable drum 5, the cable drum 5 is sleeved on the extension rods 405, and the support rods 404 support the weight of the cable drum 5 on the extension rods 405.
And starting a driving motor 403 to drive the bidirectional screw 401 to rotate, so that the two threaded seats 402 move back to back under the effect of thread occlusion, and the included angles between all the support rods 404 and the bidirectional screw 401 are increased.
The positions of the support rods 404 provided on the two screw sockets 402 are identical, so that a plurality of extension rods 405 are arranged in parallel with the bidirectional screw 401.
The included angle of the two support rods 404 connected with the same expansion rod 405 changes, and due to the existence of the orientation sliding groove 406, the end parts of the support rods 404 slide in the orientation sliding groove 406, so that the position of the expansion rod 405 along the axial direction of the bidirectional screw 401 is unchanged, but the distance between the expansion rod 405 and the bidirectional screw 401 is gradually increased until the surface of each expansion rod 405 is attached to the inner wall of the installation hole of the cable drum 5.
The cable reel 5 is completely tightly attached to the expansion rod 405 during installation, and the static friction force generated by the pressure of the expansion rod 405 ensures that the cable reel 5 does not move on the expansion rod 405, so that the cable reel 5 cannot shake during paying off, and the accuracy of a cable partial discharge test result is influenced.
The top of bottom plate 1 is seted up and is supplied movable support 2 to make linear motion's movable chute 6 along the axis of two-way screw 401, installs the drive screw 7 with movable support 2 bottom threaded connection through the bearing in the movable chute 6, and the lateral wall of bottom plate 1 is run through and is connected with turning handle 8 to the one end of drive screw 7.
The installation and the dismantlement of cable drum 5 all will be carried out at experimental beginning and experimental end, need rotate turning handle 8 for drive screw 7 rotates, thereby drive movable support 2 slides in activity spout 6, makes movable support 2 keep away from fixed bolster 3, makes cable drum 5 have sufficient installation space.
Preferably, the two-way screw 401 is only connected to the movable support 2 through a bearing and can be removed when the movable support 2 moves, and the end of the support rod 404 slides on the movable support 2 when moving, so that the movable support 2 provides a support point.
The bidirectional screw 401 is in interference connection with a bearing on the movable support 2, and the movable support 2 can be driven by the driving screw 7 to be tightly abutted against the bidirectional screw 401.
The movable support 2 comprises a sliding seat 201 in threaded connection with the driving screw 7 and a first connecting seat 202 movably connected to the top of the sliding seat 201, two locking bolts 204 used for locking the position of the first connecting seat 202 are symmetrically arranged at the tops of two opposite side walls on the sliding seat 201, and an adjusting assembly 203 connected with a bidirectional screw 401 is arranged on the first connecting seat 202.
In order to reduce the moving distance of the movable support 2, when the movable support 2 is disconnected from the two-way screw 401, the locking bolt 204 is unscrewed, so that the first connecting seat 202 is in the movable state, and the first connecting seat 202 and the adjusting assembly 203 connected with the first connecting seat 202 are tilted towards the side away from the two-way screw 401, so that the device is used for enough installation space to install and remove the cable reel 5.
Adjusting element 203 includes adjusting groove 205 that sets up at first connecting seat 202 top and adjusting screw 206 of vertical installation in adjusting groove 205 through the bearing, threaded connection has U shape board 207 with adjusting groove 205 sliding connection on adjusting screw 206, and the top of adjusting screw 206 runs through the bottom of U shape board 207 and fixedly connected with crank 208, and fixedly connected with connecting plate 209 that is connected with two-way screw 401 on the U shape board 207.
The fixing bracket 3 includes a second connecting seat 301 fixedly connected to the bottom plate 1, and a plane on which a top of the second connecting seat 301 is located and a plane on which a top of the first connecting seat 202 is located are located on a horizontal plane, the second connecting seat 301 is also provided with an adjusting component 203, and the directional sliding groove 406 is opened on the corresponding connecting plate 209.
Considering that different cables have different size requirements on the cable drum 5, the cable drum 5 with a larger diameter can contact the ground to affect the rotary use of the cable drum 5, and therefore, the adjusting component can enable the device to be suitable for different cable drums 5.
When the height of the connecting plate 209 needs to be adjusted, i.e. the installation height of the whole expansion assembly 4 is adjusted, the handle 208 on the movable support 2 is rotated to drive the adjusting screw 206 to rotate, so that the u-shaped plate 207 slides up in the adjusting groove 205 along the axis of the adjusting screw 206.
When the connecting plate 209 moves to a designated height, the crank 208 stops rotating, and the crank 208 on the fixed bracket 3 is rotated, so that the connecting plate 209 on the fixed bracket 3 is adjusted to the same height, the two-way screw 401 is kept horizontally installed, and the risk that the two-way screw 401 is broken due to the inclined installation position is avoided.
Two U-shaped plates 207 are provided with scales 9 for marking the adjusting distance, and zero scale lines of the scales 9 are arranged on the tops of the U-shaped plates 207.
In order to adjust the mounting height of the movable support 2 and the fixed support 3 better and more accurately, the adjusting distance is specified through the scales 9, and the adjustment is more convenient and accurate.
Two stabilizer bars 210 inserted into u-shaped plate 207 are fixedly connected in adjusting groove 205, and two stabilizer bars 210 are symmetrically disposed on two sides of adjusting screw 206.
The provision of two stabilizing bars 210 makes U-shaped plate 207 more stable in movement, making it more stable against external disturbances.
An auxiliary sliding groove 211 identical to the directional sliding groove 406 is formed in the side wall of the connecting plate 209 on the movable support 2, and one end of each of the plurality of support rods 404 far away from the fixed support 3 is slidably connected in the auxiliary sliding groove 211.
The auxiliary sliding groove 211 has the same function as the directional sliding groove 406, and the control supporting rod 404 rotates along with the rotation of the threaded seat 402, and then the motion track of the supporting rod 404 is controlled to ensure the state of the expansion rod 405.
The maximum distance between the extension rod 405 and the threaded seat 402 is less than the length of the support rod 404.
That is, the extension rod 405 is not movably connected to the end of the support rod 404, so that the two ends of the support rod 404 can limit the cable reel 5 from sliding off during installation.
The outer surface of the extension rod 405 is curved, and the curved surface of the extension rod 405 is rough.
The arc surface can increase the area of contact of extension rod 405 and cable drum 5, and the coefficient of friction of rough surface is great, increases frictional force for the static friction that cable drum 5 received is bigger, avoids cable drum 5 to move on extension rod 405.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The testing device for the cable partial discharge test platform is characterized by comprising a bottom plate (1) installed on the ground through bolts, a movable support (2) and a fixed support (3) which are arranged on the bottom plate (1) in a mirror image mode, wherein an expansion assembly (4) is arranged between the movable support (2) and the fixed support (3) together, and a cable reel (5) is installed on the expansion assembly (4);
the expansion component (4) comprises a bidirectional screw rod (401) arranged between the movable bracket (2) and the fixed bracket (3) through a bearing and two thread seats (402) which are symmetrically sheathed on the bidirectional screw rod (401), one end of the bidirectional screw (401) penetrates through the fixed support (3) to the outer side and is connected with a driving motor (403), a plurality of support rods (404) are symmetrically and movably connected on each threaded seat (402), a plurality of directional chutes (406) are arranged on the side wall of the fixed bracket (3), and one end of a plurality of support rods (404) on the threaded seat (402) close to the fixed bracket (3) is connected in a sliding way in the corresponding directional sliding chute (406), an expansion rod (405) is fixedly and movably connected between the supporting rod (404) on one of the threaded seats (402) and the corresponding supporting rod (404) on the other threaded seat (402).
2. The testing device of the cable partial discharge test platform according to claim 1, wherein a movable sliding groove (6) for the movable support (2) to move linearly along the axis of the bidirectional screw (401) is formed in the top of the bottom plate (1), a driving screw (7) in threaded connection with the bottom of the movable support (2) is installed in the movable sliding groove (6) through a bearing, and one end of the driving screw (7) penetrates through the side wall of the bottom plate (1) and is connected with a rotating handle (8).
3. The cable partial discharge test platform testing device according to claim 2, wherein the movable support (2) comprises a sliding seat (201) in threaded connection with the driving screw (7) and a first connecting seat (202) movably connected to the top of the sliding seat (201), two locking bolts (204) for locking the position of the first connecting seat (202) are symmetrically arranged at the tops of two opposite side walls of the sliding seat (201), and an adjusting assembly (203) connected with a bidirectional screw (401) is arranged on the first connecting seat (202).
4. The cable partial discharge test platform testing device of claim 3, wherein the adjusting component (203) comprises an adjusting groove (205) formed at the top of the first connecting seat (202) and an adjusting screw (206) vertically installed in the adjusting groove (205) through a bearing, a U-shaped plate (207) slidably connected with the adjusting groove (205) is connected to the adjusting screw (206) in a threaded manner, the top of the adjusting screw (206) penetrates through the bottom of the U-shaped plate (207) and is fixedly connected with a crank (208), and a connecting plate (209) connected with the bidirectional screw (401) is fixedly connected to the U-shaped plate (207).
5. The cable partial discharge test platform testing device according to claim 4, wherein the fixing bracket (3) comprises a second connecting seat (301) fixedly connected with the bottom plate (1), a plane on which the top of the second connecting seat (301) is located and a plane on which the top of the first connecting seat (202) is located are located on a horizontal plane, the second connecting seat (301) is also provided with an adjusting component (203), and the directional sliding grooves (406) are arranged on the corresponding connecting plates (209).
6. The test device for the partial discharge test platform of the cable according to claim 5, wherein two U-shaped plates (207) are provided with scales (9) for marking an adjusting distance, and zero scale lines of the scales (9) are provided at the top of the U-shaped plate (207).
7. The testing device for the cable partial discharge test platform according to claim 6, wherein two stabilizer bars (210) inserted into the U-shaped plate (207) are fixedly connected in the adjusting groove (205), and the two stabilizer bars (210) are symmetrically arranged on two sides of the adjusting screw (206).
8. The testing device of the cable partial discharge test platform according to claim 5, wherein an auxiliary sliding groove (211) identical to the directional sliding groove (406) is formed in a side wall of the connecting plate (209) on the movable support (2), and one end of each of the plurality of supporting rods (404) far away from the fixed support (3) is slidably connected into the auxiliary sliding groove (211).
9. The cable partial discharge test platform testing device according to claim 8, wherein the maximum distance between the extension rod (405) and the threaded seat (402) is smaller than the length of the support rod (404).
10. The cable partial discharge test platform testing device of claim 9, wherein the outer surface of the extension rod (405) is arc-shaped, and the arc-shaped surface of the extension rod (405) is rough.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011202810.7A CN112193912A (en) | 2020-11-02 | 2020-11-02 | Cable partial discharge test platform testing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011202810.7A CN112193912A (en) | 2020-11-02 | 2020-11-02 | Cable partial discharge test platform testing arrangement |
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| Publication Number | Publication Date |
|---|---|
| CN112193912A true CN112193912A (en) | 2021-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011202810.7A Pending CN112193912A (en) | 2020-11-02 | 2020-11-02 | Cable partial discharge test platform testing arrangement |
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| Country | Link |
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| CN (1) | CN112193912A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113336006A (en) * | 2021-04-28 | 2021-09-03 | 国网山东省电力公司济南市济阳区供电公司 | Take-up device for electric power construction |
| CN116660697A (en) * | 2023-06-16 | 2023-08-29 | 江苏希波电气科技有限公司 | Cable partial discharge test system convenient to adjust and test process thereof |
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| CN210682733U (en) * | 2019-07-25 | 2020-06-05 | 张圳涛 | Portable adjustable power cable pay-off device |
| CN210682735U (en) * | 2019-09-07 | 2020-06-05 | 北京房地天宇特种设备安装工程有限公司 | Steel wire rope unwinding device |
| CN210824843U (en) * | 2019-10-14 | 2020-06-23 | 广东永壹珠江电缆有限公司 | Winding equipment for cable processing |
| CN111689268A (en) * | 2020-06-24 | 2020-09-22 | 新沂市宏展电子科技有限公司 | Unwinding device is used in production of three-dimensional holographic image heat shrink film of relief (sculpture) |
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| CN113336006A (en) * | 2021-04-28 | 2021-09-03 | 国网山东省电力公司济南市济阳区供电公司 | Take-up device for electric power construction |
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