CN113702886A - Portable calibration frock and calibration car - Google Patents
Portable calibration frock and calibration car Download PDFInfo
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- CN113702886A CN113702886A CN202110982980.XA CN202110982980A CN113702886A CN 113702886 A CN113702886 A CN 113702886A CN 202110982980 A CN202110982980 A CN 202110982980A CN 113702886 A CN113702886 A CN 113702886A
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- upper cover
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- 238000009434 installation Methods 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 241000234295 Musa Species 0.000 claims description 7
- 235000018290 Musa x paradisiaca Nutrition 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
Abstract
The invention discloses a portable calibration tool and a calibration vehicle, wherein the calibration tool comprises: a universal meter; a calibration plate; a control panel; an upper cover assembly; a base assembly; wherein the universal meter installation is fixed in on the base subassembly, the calibration board is fixed in base subassembly, the control panel is connected calibration board and universal meter for acquire calibration data, the upper cover subassembly cover in base subassembly top, just the base subassembly has network connector and socket, just the network subassembly is connected the control panel. The calibration tool realizes a multi-plate and multi-channel calibration mode by adding the calibration plate and adopting a software control mode, and improves the calibration efficiency and effect.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a portable calibration tool and a calibration vehicle.
Background
In the testing process of the lithium battery, calibration is periodical correction and maintenance of production equipment and a testing system. Along with the gradual increase of the demand of the market for lithium batteries, matched battery formation and capacity grading equipment is increased, due to the iteration and the improvement of the battery formation and capacity grading, the space is reasonably utilized, the size of the equipment is reduced, and a plurality of manufacturers stack the formation and capacity grading equipment in order to utilize the space of a field. Due to the necessity of a complete calibration device, a calibration vehicle is usually provided for every dozens of vehicles in order to save cost.
Under the multilayer condition, the tradition is still maintained to some small equipment manufacturers, is equipped with the calibration car, because the stair is less, and the calibration car is generally put at the bottom, need act as go-between to the calibration of second floor equipment on the bottom calibration car during the calibration of second floor, and pencil overlength line loss seriously influences the precision. Under the multilayer condition, most equipment manufacturers are equipped with portable calibration frock, and portable calibration frock is integrated to the calibration frock with the calibration board control panel, and staff need carry near equipment with the calibration frock when the calibration at present, and the calibration line is connected to equipment, and the net twine is connected to the computer host, and rubber plug pencil is connected to the universal meter, and staff's operation step is more, and calibration preparation time is longer, and is not simple and convenient enough.
Most of the calibration tools are large in size, the shell is made of thin steel plates, the weight is heavier, and the experience of workers is poor. Most of calibration tools generally adopt single-plate calibration, the calibration speed is low, the precision is low, and the productivity and the quality of the battery are influenced.
Disclosure of Invention
One of the purposes of the invention is to provide a portable calibration tool, which realizes a multi-plate and multi-channel calibration mode by adding a calibration plate and a software control mode, and improves calibration efficiency and effect.
Another object of the present invention is to provide a portable calibration tool, which can save space through structural design, replace frame material on the premise of ensuring strength, and reduce weight.
Another object of the present invention is to provide a portable calibration tool, wherein the calibration tool employs a touch screen having a computer host function, and a universal meter is integrated in the calibration tool, so that connection steps are greatly reduced, and calibration time can be greatly reduced.
In order to achieve at least one of the above objects, the present invention further provides a portable calibration tool, comprising:
a universal meter;
a calibration plate;
a control panel;
an upper cover assembly;
a base assembly;
wherein the universal meter installation is fixed in on the base subassembly, the calibration board is fixed in base subassembly, the control panel is connected calibration board and universal meter for acquire calibration data, the upper cover subassembly cover in base subassembly top, just the base subassembly is equipped with base subassembly network connector and socket, just base subassembly network connector connects the control panel.
According to a preferred embodiment of the present invention, the calibration plates are configured as a multi-layer structure, each layer has one calibration plate, and a fan is disposed on an edge of each layer of calibration plate for dissipating heat, a PCB bracket is disposed on a side surface of the fan, and a PCB fixing plate is disposed at the bottom of the calibration plate, and the PCB bracket is connected to an adjacent PCB fixing plate for fixedly connecting the adjacent calibration plate.
According to another preferred embodiment of the present invention, the base assembly includes a bottom plate, a main control mounting plate is fixedly mounted on the bottom plate of the base assembly, the control board is fixedly mounted on the main control mounting plate, a PCB support front fixing block and a PCB support rear fixing block are arranged at the bottom of the PCB support, and the PCB support front fixing block and the PCB support rear fixing block are respectively located above the bottom plate of the base assembly.
According to another preferred embodiment of the present invention, a calibration fixture router is further disposed above the base plate of the base assembly, a router hoop is disposed on the calibration fixture router, the calibration fixture router is connected to a router power supply, the router power supply is mounted and fixed on the base plate of the base assembly, and the router power supply is fixed by the router power supply hoop.
According to another preferred embodiment of the present invention, the base assembly is further mounted and fixed with a terminal strip, a banana head, a power supply, a base assembly network connector and a socket, wherein the terminal strip is fixed on the base assembly bottom plate, the terminal strip is connected with the socket, and the power supply is connected with a control board for supplying power to the control board.
According to another preferred embodiment of the present invention, the base component includes a vertical plate perpendicular to the base component bottom plate, the vertical plate is integrally formed on the base component bottom plate, the banana head, the base component network connector and the socket are disposed on the vertical plate, and the base component network connector is connected to the calibration fixture router.
According to another preferred embodiment of the present invention, a touch display screen is connected to one side of the base assembly, the touch display screen is connected to the control board, the touch display screen is configured as an inclined connection structure, a bottom cover welding member is installed under the touch display screen, and the bottom cover welding member is connected to the base assembly bottom plate and is used for fixing the touch display screen.
According to another preferred embodiment of the present invention, the upper cover assembly includes a handle, an upper cover welding member, an upper cover network connection port, a socket with a switch, an upper cover side plate, an upper cover front plate, an upper cover reinforcing rib and a handle reinforcing rib, wherein the upper cover network connection port is connected to a router, and the socket with a switch is connected to a terminal row.
According to another preferred embodiment of the invention, a universal meter is detachably mounted below the bottom cover weldment connected with the touch display screen, the universal meter is fixed on the universal meter mounting assembly, the universal meter mounting assembly comprises a universal meter mounting shell, and the upper cover assembly is connected above the universal meter mounting shell to form an integral calibration tool.
To achieve at least one of the above objects, the present invention further provides a calibration cart, the calibration cart including:
the portable calibration tool is provided;
a vehicle body;
a computer display screen;
a total network port;
a total power-on socket;
a vehicle-mounted router;
a computer host;
the vehicle-mounted display screen is fixedly installed above the vehicle body, the computer display screen is connected with a computer host, the main network port is connected with a vehicle-mounted router, the vehicle-mounted router is connected with the computer host, and the computer host is fixedly installed in the vehicle body.
Drawings
Fig. 1 is a schematic perspective view of a portable calibration fixture according to the present invention.
Fig. 2 is a schematic view showing an installation structure of a disassembled base assembly of the portable calibration tool of the present invention.
Fig. 3 is a schematic view showing another mounting structure of the disassembled base assembly of the portable calibration tool of the present invention.
Fig. 4A is a schematic structural diagram of an upper cover assembly of the portable calibration tool of the present invention.
Fig. 4B is a schematic structural diagram of an upper cover assembly of the portable calibration tool according to another embodiment of the invention.
FIG. 5 shows a schematic diagram of a connection structure of the portable calibration tool multimeter when the universal meter is not detached.
FIG. 6 shows a schematic diagram of a connection structure of a portable calibration tool multimeter after disassembly.
Fig. 7 is a schematic view showing a connection structure of a calibration cart according to the present invention.
Fig. 8 is a side view of a calibration cart according to the present invention.
Fig. 9 is a schematic side view of another calibration cart according to the present invention.
Fig. 10 is a schematic side view of another calibration cart according to the present invention.
Wherein the content of the first and second substances,
a calibration vehicle-1, a computer display screen-11, a display screen bracket-12, a main network port-13, a main power inlet socket-14, an air circuit breaker-15, a first socket-16, a calibration vehicle router-17, a second socket-18, a computer host-19, a calibration tool-2, a universal meter fixing component-21, a universal meter-211, a base component-22, a touch display screen-221, a bottom cover welding component-222, a calibration plate-223, a fan fixing pin-224, a fan-225, a PCB fixing plate-226, a PCB bracket-227, a power supply-228, a control plate-229, a main control mounting plate-2210, a PCB bracket front fixing block-2211, a PCB bracket rear fixing block-2212, a calibration tool router-2213 and a router hoop-2214, the router comprises a router power supply hoop 2215, a terminal row-2216, a banana head-2217, a base component network connector-2218, a socket-2219, an upper cover component-23, a handle-231, an upper cover welding piece-232, an upper cover side plate-2321, an upper cover front plate-2322, an upper cover reinforcing rib-2323, a handle reinforcing rib-2324, an upper cover component network connector-233 and a socket-234 with a switch.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Referring to fig. 1 to 10, the invention discloses a portable calibration tool and a calibration vehicle, wherein the calibration tool mainly comprises a multimeter; a calibration plate; a control panel; the calibration plate is arranged on the base assembly in a layered mode, the base assembly is used for fixing the control plate and the calibration plate, and the base assembly and the upper cover assembly are connected to form a complete cover-shaped structure. The calibration car is connected with the calibration tool, and the calibration tool is provided with a portable structure and a detachable universal meter, and interfaces such as a power interface, a network connector and the like of the calibration tool can be connected with corresponding interfaces on the calibration car through corresponding cables.
Referring to fig. 2-3 specifically, the base assembly includes a PCB bracket and a bottom plate, the PCB bracket is perpendicular to the bottom plate of the base assembly, wherein the calibration plate is connected to the PCB bracket, the calibration plate is configured as a two-layer structure, the two calibration plates are fixed by the PCB bracket, a PCB fixing plate is respectively provided at the bottom of each of the two calibration plates for fixedly connecting the calibration plate, the PCB fixing plate is connected to the PCB bracket, and the PCB fixing plates are parallel to each other and parallel to the bottom plate of the base assembly, so that two adjacent calibration plates are parallel to each other to form two layered structures. The front end and the rear end of the PCB support are respectively provided with a fixing block, and the fixing blocks are used for fixing the control panel.
Each calibration plate is provided with a fan, the edge of the fan is connected with the PCB bracket and used for fixing the fan, a fan fixing corner piece is arranged on the fan and used for fixing the fan, original pieces such as a control panel, a power supply, a calibration tool router, a terminal strip and the like are also arranged on the bottom plate of the base component, the bottom of the control panel is provided with a main control mounting plate, the main control mounting plate has a size and a structure which are matched with the control panel and used for fixing the control panel on the bottom plate of the base component, the power supply is fixed on the bottom plate of the base component and connected with the control panel and used for supplying power to the control panel, the bottom plate of the base component is provided with a router power supply which is connected with the calibration tool router and used for supplying power to the calibration tool router, and the bottom plate of the base component is provided with a router hoop and a router power hoop, the router hoop and the router power hoop are fixed on the bottom plate of the base assembly and are respectively used for fixing the calibration fixture router and the router power supply.
The touch-control display screen is connected with on one side of the front side of base subassembly, touch-control display screen connection control panel for interact with the control panel, the touch-control display screen with certain angle of inclination has between the bottom plate of base subassembly, and this angle of inclination is set up to 60 to can save space, the below of touch-control display screen has the bottom weldment, the bottom weldment is used for connecting fixed universal meter. Another edge of base unit rear side is provided with the riser, riser vertical fixation in on the base unit bottom plate, just a plurality of interfaces have on the riser, wherein the interface on the riser includes: the banana head, the base component network connector and the socket, wherein the base component network connector is connected with a built-in calibration tool router, the plugboard is connected with the terminal row,
the upper cover assembly of the calibration tool is connected with the base assembly, the edge of the upper cover assembly is connected and fixed to the edge of the base assembly bottom plate, and the upper cover assembly covers the base assembly after being installed and fixed. The upper cover assembly comprises a handle, an upper cover welding piece, an upper cover assembly network connector, a socket with a switch, an upper cover side plate, an upper cover front plate, an upper cover reinforcing rib and a handle reinforcing rib, wherein the upper cover network connector is connected with the calibration tooling router, and the socket connecting terminal row with the switch is arranged.
Please refer to a schematic perspective structure diagram of a portable calibration tool shown in fig. 1, wherein a universal meter is installed at the bottom of the calibration tool, a base assembly is connected above the universal meter, the universal meter is perpendicular to a bottom plate of the base assembly, the calibration tool comprises a universal meter fixing assembly, the universal meter fixing assembly is arranged at two side edges of the universal meter, the universal meter fixing assembly has a square shell structure, the universal meter fixing assembly is connected above the upper cover assembly, and forms a cavity structure accommodating the base assembly together with the upper cover assembly. The metal parts in base subassembly, upper cover subassembly and the fixed subassembly of universal meter all make aluminium to can reduce the weight of calibration frock.
It is worth mentioning that the invention provides a calibration vehicle, wherein the calibration vehicle is provided with a main network port, an air circuit breaker, a first power strip, a second power strip, a main power inlet socket and a router, which are matched with the calibration tool. The calibration vehicle is provided with a computer display screen, a display screen support, a computer host and the like, each calibration vehicle can be provided with 2 calibration tools, and each calibration tool is provided with 2 calibration plates, so that 4 layers of calibration can be realized by each calibration vehicle, and the calibration efficiency is greatly submitted, wherein the calibration method comprises the following steps:
when carrying out the bottom calibration, the calibration frock can directly be placed in the calibration car, connects through the socket of calibration frock the row of inserting of calibration car, the network connector mouth connection of calibration frock router in the calibration car, as long as during the calibration with the total net gape of calibration car self with treat calibration equipment self router connection, and the total socket that advances of calibration car is connected to treat that the electric access of calibration equipment can accomplish the calibration, because the calibration frock is the calibration board on 4 layers, consequently realize 4 passageway calibrations when carrying out the bottom calibration.
When carrying out 2 layers of calibrations, the calibration car is close to the equipment of treating the calibration, draws the calibration frock in the calibration car, the router of the equipment of treating the calibration is connected to the network connector on the calibration frock, just the power interface of calibration frock self is connected treat the interface of getting of calibration equipment, and the relevant interface of calibration equipment is treated through calibration line connection to the relevant interface of calibration board in the calibration frock to realize the calibration of the equipment of treating the calibration of calibration frock, treat that the calibration data of calibration frock preserve in the control panel, realize the extraction of calibration data through connecting the interface that the calibration car corresponds.
Referring to fig. 5 and 6, the invention provides two connection modes of a calibration tool, wherein after the multimeter shown in fig. 6 is disassembled, the banana head on the vertical plate of the calibration tool, the vertical plate network connector, the socket and the corresponding interfaces on the multimeter are connected through a cable, the network connector on the calibration tool is connected with the router of the equipment to be calibrated, the power interface is connected with the power-taking interface of the equipment to be calibrated, and the interface related to the calibration plate in the calibration tool is connected with the related interface of the equipment to be calibrated through a calibration wire to realize detachable connection calibration of the multimeter.
It is worth mentioning that, the universal meter can be dismantled to connect and be fixed in base subassembly below, just components such as router, terminal row, control panel, power module on the universal meter connects the base subassembly respectively for data such as the power of acquireing relevant component, voltage, the fixed subassembly of universal meter includes universal meter mount pad and universal meter bracing piece are constituteed, wherein the universal meter mount pad has the elliptical aperture, and fixes through the mode that locks all around and attach the universal meter.
It will be understood by those skilled in the art that the embodiments of the present invention described above and illustrated in the drawings are given by way of example only and not by way of limitation, the objects of the invention having been fully and effectively achieved, the functional and structural principles of the present invention having been shown and described in the embodiments, and that various changes or modifications may be made in the embodiments of the present invention without departing from such principles.
Claims (10)
1. The utility model provides a portable calibration frock which characterized in that includes:
a universal meter;
a calibration plate;
a control panel;
an upper cover assembly;
a base assembly;
wherein the universal meter installation is fixed in on the base subassembly, the calibration board is fixed in base subassembly, the control panel is connected calibration board and universal meter for acquire calibration data, the upper cover subassembly cover in base subassembly top, just the base subassembly is equipped with base subassembly network connector and socket, just base subassembly network connector connects the control panel.
2. The portable calibration tool according to claim 1, wherein the calibration plates are configured to be a multi-layer structure, each layer of the calibration plates is provided with one calibration plate, a fan is arranged on the edge of each layer of the calibration plates and used for dissipating heat, a PCB support is arranged on the side surface of the fan, a PCB fixing plate is arranged at the bottom of each calibration plate, and the PCB support is connected with the adjacent PCB fixing plate and used for fixedly connecting the adjacent calibration plates.
3. The portable calibration tool according to claim 2, wherein the base assembly comprises a bottom plate, a main control mounting plate is fixedly mounted on the bottom plate of the base assembly, the control plate is fixedly mounted on the main control mounting plate, a PCB support front fixing block and a PCB support rear fixing block are arranged at the bottom of the PCB support, and the PCB support front fixing block and the PCB support rear fixing block are respectively located above the bottom plate of the base assembly.
4. The portable calibration tool of claim 2, wherein a calibration tool router is further arranged above the base assembly bottom plate, a router hoop is arranged on the calibration tool router, the calibration tool router is connected with a router power supply, the router power supply is fixedly mounted on the bottom plate of the base assembly, and the router power supply is fixed by the router power hoop.
5. The portable calibration tool of claim 2, wherein a terminal strip, a banana head, a power supply, a base component network connector and a socket are further mounted and fixed on the base component, wherein the terminal strip is fixed on the base component bottom plate, the terminal strip is connected with the socket, and the power supply is connected with a control board for supplying power to the control board.
6. The portable calibration tool of claim 5, characterized in that the base component comprises a vertical plate perpendicular to the base component bottom plate, the vertical plate is integrally formed with the base component bottom plate, the vertical plate is provided with the banana head, the base component network connector and the socket, and the base component network connector is connected with the calibration tool router.
7. The portable calibration tool according to claim 2, wherein a touch display screen is connected to one side of the base assembly, the touch display screen is connected to the control board, the touch display screen is arranged in an inclined connection structure, a bottom cover welding piece is installed under the touch display screen, and the bottom cover welding piece is connected to a bottom plate of the base assembly and used for fixing the touch display screen.
8. The portable calibration tool according to claim 4, wherein the upper cover assembly comprises a handle, an upper cover weldment, an upper cover network connector, a socket with a switch, an upper cover side plate, an upper cover front plate, an upper cover reinforcing rib and a handle reinforcing rib, wherein the upper cover network connector is connected with a calibration tool router, and the socket with the switch is connected with a terminal row.
9. The portable calibration tool of claim 1, wherein a universal meter is detachably mounted below a bottom cover weldment connected with the touch display screen, the universal meter is fixed on a universal meter mounting assembly, the universal meter mounting assembly comprises a universal meter mounting shell, and the upper cover assembly is connected above the universal meter mounting shell to form the whole calibration tool.
10. A calibration cart, the calibration cart comprising:
the portable calibration tool is provided;
a vehicle body;
a computer display screen;
a total network port;
a total power-on socket;
a vehicle-mounted router;
a computer host;
the vehicle-mounted display screen is fixedly installed above the vehicle body, the computer display screen is connected with a computer host, the main network port is connected with a vehicle-mounted router, the vehicle-mounted router is connected with the computer host, and the computer host is fixedly installed in the vehicle body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110982980.XA CN113702886A (en) | 2021-08-25 | 2021-08-25 | Portable calibration frock and calibration car |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110982980.XA CN113702886A (en) | 2021-08-25 | 2021-08-25 | Portable calibration frock and calibration car |
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| CN113702886A true CN113702886A (en) | 2021-11-26 |
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| CN210136298U (en) * | 2019-06-13 | 2020-03-10 | 中国人民解放军空军工程大学航空机务士官学校 | General calibrating device of aviation guarantee equipment electrical parameter |
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