CN215813133U - Self-recovery type over-voltage and under-voltage protector calibration equipment - Google Patents
Self-recovery type over-voltage and under-voltage protector calibration equipment Download PDFInfo
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- CN215813133U CN215813133U CN202121763532.2U CN202121763532U CN215813133U CN 215813133 U CN215813133 U CN 215813133U CN 202121763532 U CN202121763532 U CN 202121763532U CN 215813133 U CN215813133 U CN 215813133U
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Abstract
The utility model discloses a self-recovery type over-voltage and under-voltage protector checking device which comprises a box body, wherein a feeding hole and a discharging hole are respectively formed in two ends of the box body, a transmission mechanism is arranged in the box body and connected with the feeding hole and the discharging hole, at least two detection devices controlled by independent power supplies are sequentially arranged on the transmission mechanism, and the working voltages of the independent power supplies are unequal. The detection device is controlled by at least two groups of independent power supplies with different voltages, one of the detection devices is used for overvoltage detection, the other detection device is used for undervoltage detection, the voltage change range of the two power supplies can be reduced, excessive voltage regulation on the two power supplies in a large range is not needed, the service life of the power supplies is effectively prolonged, and then the two different detection paths can effectively improve the checking efficiency.
Description
Technical Field
The utility model belongs to the field of low-voltage apparatus detection, and particularly relates to a self-recovery type over-voltage and under-voltage protector calibration device.
Background
A self-recovery overvoltage and undervoltage protector is a device which can automatically detect the voltage of a line, can be automatically disconnected when the overvoltage or undervoltage in the line exceeds a specified value, and can be automatically closed when the voltage of the line recovers to be normal.
It is before dispatching from the factory, need check-up, and it includes overvoltage detection, undervoltage detection and withstand voltage detection, and current check-up in-process adopts same detection device, steps up the power, carries out overvoltage detection to the product, after overvoltage detection accomplishes, steps down to it, then continues undervoltage detection. The overvoltage and undervoltage detection circuit is based on the same power supply, the overvoltage and undervoltage range is large, the requirement on the power supply is high, the influence on the service life of the power supply due to excessive switching is large, and the power supply can break down to influence the checking efficiency.
The current test methods are as follows: carrying out overvoltage and undervoltage tests on the same station, and comprising the following steps: and performing 230V power-on closing, rising to 250V to keep 60s for detecting overvoltage and not acting, rising to 275V to keep 15s for detecting overvoltage tripping, falling to 230V to keep 40s for overvoltage recovery, falling to 180V to keep 60s for detecting undervoltage and not acting, falling to 160V to detect undervoltage tripping, and rising to 230V to keep 40s for undervoltage recovery. The test efficiency is low, and the service life of the power supply is influenced.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a self-recovery type over-voltage and under-voltage protector checking device.
In order to achieve the purpose, the utility model provides the following technical scheme:
the utility model provides an under-voltage protector check-up equipment is crossed to self-resuming formula, its includes the box, the both ends of box are equipped with feed inlet and discharge gate respectively, are equipped with transmission device in the box, transmission device connects feed inlet and discharge gate, last at least two detection device by independent power supply control of being equipped with in proper order of transmission device, and independent power supply's operating voltage inequality.
The detection device includes:
the frame is arranged on the upper side of the transmission mechanism;
the fixing clamp is positioned at the bottom of the frame and used for fixing a product to be detected;
a contact terminal having conductivity;
the supporting frame is arranged on the upper side of the frame, can move relative to the frame and can guide the contact terminal to a detection point of a product to be detected fixed by a fixing clamp;
the driving mechanism is arranged on the upper side of the frame, is linked with the support frame and is used for driving the support frame to move away from or towards the frame;
the light guide structure is arranged on the frame, corresponds to the indicator lamp of the product to be detected fixed by the fixing clamp, and is used for transmitting the color of the indicator lamp of the product to be detected;
and the PLC control system is used for recording the color change of the indicator lamp of the product to be tested through the light guide structure in the test process and recording the product to be tested with fault indication.
The two sides of the transmission track of the transmission mechanism located at the position of the detection device are provided with lifting mechanisms used for lifting a to-be-detected product located on the transmission track, and the bottom of the frame is provided with a clamping mechanism used for clamping the lifted to-be-detected product.
Both sides all are equipped with the stop gear of liftable around the lifting mechanism.
The utility model discloses a detection device, including detection device, screw driver, electric screwdriver, workstation and transmission track, detection device's front and back both sides are equipped with screw tightening device and screw respectively and move back the position device, screw tightening device and screw move back the position device and all are equipped with two electric screwdriver that set up side by side, are used for driving electric screwdriver and go up and down and the workstation of displacement around and set up the clamping mechanism who is used for fixed waiting to operate the product in transmission track both sides.
The work bench includes:
the working table is fixedly arranged on the transmission mechanism, and the bottom of the working table is provided with a space for the transmission track to pass through;
the sliding table top is provided with a vertical surface and a plane, the plane is arranged on the upper side of the vertical surface, and the vertical surface can be arranged on the working table top in a sliding mode;
the lifting mechanism can be arranged on a vertical surface in a sliding mode and is provided with two electric screwdriver fixing pieces arranged side by side.
Elevating system includes a connecting plate, the both ends of connecting plate all are equipped with the guide bar, and the guide bar of one end constitutes the cooperation of sliding with the plane, is equipped with the electric screwdriver mounting on its other end guide bar, just be equipped with the slide rail that perpendicular horizontal plane set up on the vertical face, one side and the slide rail of electric screwdriver mounting constitute the cooperation of sliding, the plane is equipped with the power supply that is used for driving the connecting plate lift.
And the transfer track is also provided with a pad printing detection device.
The pad printing detection device includes:
the limiting mechanism is arranged in the advancing direction of the conveying track, can be arranged in a lifting manner, and can block the product to be detected from advancing when the limiting mechanism is lifted;
the CCD camera is positioned above the blocked product to be detected and can acquire the pad printing on the surface of the shell of the product to be detected;
the light source mechanism is positioned below the CCD camera and used for providing a light source for acquiring images;
and the trigger mechanism is used for detecting whether the product to be detected is positioned below the CCD camera and sending a signal for driving the CCD camera to acquire the image of the surface of the shell of the product to be detected.
The utility model has the beneficial effects that: adopt the different independent power supply control's of at least two sets of voltages detection device, realize that two at least stations detect, one of which station is used for the excessive pressure and detects, and another station is used for undervoltage detection, can be so that the voltage variation range of two powers reduces, need not too much carry out large voltage control to it, the effectual life who improves the power, secondly two sets of different detections adopt equivalent detection method, can effectual improvement check-up efficiency.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a front view of the interior of the present invention.
Fig. 3 is a top view of the present invention (panel omitted).
Fig. 4 is a schematic structural view of the screw tightening device of the present invention.
Fig. 5 is a schematic structural diagram of the detection device of the present invention.
Fig. 6 is a schematic view of another angle structure of the detecting device of the present invention.
FIG. 7 is a bottom view of the detecting device of the present invention.
FIG. 8 is a schematic structural diagram of a pad printing detection apparatus according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically connected or connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
As shown in the figure, the self-recovery type over-voltage and under-voltage protector checking device comprises a box body 1, the box body comprises a box frame and a panel, the panel covers the whole box frame, a feeding port and a discharging port are respectively arranged at two ends of the box body, a plurality of openable box doors are arranged on the front surface of the box body, the maintenance or the inspection of internal equipment is convenient, the whole box body is covered by the panel, the accident caused by the artificial approach during the detection can be avoided, a transmission mechanism 2 is arranged in the box body, the transmission mechanism 2 comprises a track frame and a transmission track 21 arranged on the track frame, the track frame is fixedly arranged on the box frame 11, the transmission track adopts a belt type transmission belt, a product to be detected can be arranged on the transmission track and driven by the transmission track to advance, the transmission mechanism is connected with the feeding port and the discharging port, so as to be convenient for sending the product to be detected to the discharging port from the feeding port, the conveying mechanism is characterized in that a screw tightening device 3, at least 2 detection devices 4 and a screw retreating device 6 are sequentially arranged in the conveying direction of the conveying mechanism, and a fault piece pushing-out device 5 is arranged on the rear side of each detection device 4.
The two detection devices are respectively connected with mutually independent power supplies, and the working voltages of the two power supplies are not equal.
Meanwhile, the detection device can adopt a modular design, different detection voltages and detection power supplies corresponding to detection steps are customized according to a required detection mode, and the detection device can be replaced or added conveniently according to different products. And different detection tests are carried out on different stations by adopting an equivalent rapid detection method, so that the efficiency of the whole test is improved.
The voltage adjustable range of the power supply for undervoltage detection is between 180-275V, and the voltage adjustable range of the power supply for overvoltage detection is between 250-275V, so that the independent test requirements are met, the voltage adjustable range can be reduced as much as possible during the test, and the influence on the service life of the power supply is reduced.
When two boxes are adopted, the screw tightening device and the detection device can be arranged in the same box, and the screw withdrawing device and other devices are arranged in the other box, so that the influence of the high pressure of the detection device on the other devices is reduced.
The detection device 4 comprises:
the frame 41 is arranged on the upper side of the transmission mechanism, is a flat plate, is fixedly arranged on the box frame 11 at four ends through fixing columns 49, and leaves a space at the bottom of the frame for a product to be detected to pass through;
the fixing clamp 412 is positioned at the bottom of the frame and used for fixing a product to be detected, the fixing clamp can be arranged on the frame in a replaceable mode, part of the fixing clamp is embedded in the flat plate, limiting strips 4121 are formed on two sides of the lower end of the fixing clamp and used for limiting the position of the product to be detected, a space is formed between the two limiting strips, the top end of the overvoltage and undervoltage protector can be embedded in the space, and the detection requirements of the products to be detected in different models can be met by replacing the fixing clamp;
a conductive contact terminal 44 in the shape of a needle tube, in which a retractable probe is arranged, the front end of the conductive contact terminal passes through a through hole arranged on the fixing clamp 412 corresponding to a detection point of a product to be detected, the rear end of the conductive contact terminal is fixedly limited by the supporting frame and can be driven by the supporting frame to move relative to the frame direction, the front end of the conductive contact terminal passes through the through hole and contacts with the detection point of the product to be detected, the rear end of the conductive contact terminal is electrically connected with a power supply controlled by the PLC control system through a lead, and when the conductive contact terminal contacts with the product to be detected, the conductive contact terminal gives a power supply for detection;
the supporting frame is arranged on the upper side of the frame and can move relative to the frame, the supporting frame can guide the contact terminal to a detection point of a product to be detected fixed by a fixing clamp, the supporting frame comprises an installation surface 43, a plurality of guide rods 45 are arranged on the installation surface, the guide rods 45 are arranged perpendicular to the frame, a driving mechanism 42 is arranged between the supporting frame and the frame, the driving mechanism is used for driving the supporting frame to move towards the direction of the frame or move away from the direction of the frame, and therefore the contact and disconnection between the contact terminal and the product to be detected are achieved, and the product to be detected is detected;
the driving mechanisms 42 are arranged on the upper side of the frame, are linked with the supporting frame and are used for driving the supporting frame to move away from or towards the frame, the driving mechanisms are motors, preferably two driving mechanisms are adopted, are symmetrically or asymmetrically arranged on two sides of the frame and play a role in supporting and driving the supporting frame to move;
the light guide structure is arranged on the frame, can also be arranged on the fixing clamp, is arranged corresponding to an indicator lamp of a product to be detected fixed by the fixing clamp, and is used for conducting the color of the indicator lamp of the product to be detected, a through hole 4122 is arranged at the position, corresponding to the indicator lamp of the product to be detected, of the fixing clamp, a light guide column is arranged in the through hole and extends to a detection module of the PLC control system, the color of the indicator lamp is detected by the light guide column, whether the corresponding product to be detected fails in the detection is determined by judging the color of the indicator lamp, full-automatic failure detection is realized, the product to be detected, which fails at present, can be recorded, and is subsequently kicked out of the transmission track;
and the PLC control system is used for controlling the power supply voltage electrically connected with the contact terminal, recording the color change of an indicator light of a product to be tested through the light guide structure in the test process, recording the product to be tested with fault indication, and pushing the fault piece out of the transmission track of the transmission mechanism by the fault piece pushing-out device after the test is finished.
The detection device has the advantages that the number of the detection devices in one detection is multiple, preferably 8, the detection devices can detect a plurality of products to be detected simultaneously, and the detection efficiency is improved.
Lifting mechanisms for lifting the product to be detected on the conveying track are arranged on two sides of the conveying track of the conveying mechanism positioned at the position of the detection device, the lifting mechanism comprises symmetrically arranged lifting plates 46 and a power source 47 for driving the lifting plates to lift, the power source can be a cylinder or a motor, the lifting plates are L-shaped and arranged oppositely, the transverse position 461 of the lifting plates can be used for supporting the product to be tested and driving the product to be tested to ascend and leave the transmission rail, and in addition, when the product is not lifted, the transverse position is slightly lower than the transmission rail or is flush with the transmission surface of the transmission rail, so that the transmission effect of the product to be detected on the transmission rail is not influenced, in addition, the vertical position 462 also plays a limiting role, the two ends of each product to be detected positioned at the position are ensured to be aligned, and when the detection terminal is detected, the detection terminal can be more accurately contacted with the detection point, so that the detection efficiency is improved.
The bottom of the frame is provided with a clamping mechanism for clamping and fixing the lifted products to be detected, the clamping mechanism comprises a fixed limiting part 411 and a clamping part 410 which is arranged at the other end and can move relative to the limiting part, wherein the limiting part is arranged between the limiting strips of the fixing clamp, and the clamping part is driven by a power source to press a plurality of products to be detected on the limiting strips to prevent the products from moving and influencing detection.
The front side and the rear side of the lifting mechanism are respectively provided with a lifting limiting mechanism 48, wherein the limiting mechanism positioned on the front side is used for retaining a product to be detected at the detection station, and the limiting mechanism positioned on the rear side stops subsequent products to be detected from entering the detection station when the number of the products to be detected in the detection station reaches a peak value.
The screw tightening device and the screw withdrawing device are respectively provided with two electric screw drivers 38 arranged side by side, a workbench used for driving the electric screw drivers to ascend and descend and to move back and forth, and clamping mechanisms arranged on two sides of the transmission track and used for fixing products to be operated.
The product that awaits measuring crosses under-voltage protector for self-resuming formula, it when carrying out the check-up, need guarantee its inside formation route with the screw tightening of the terminal at both ends, consequently this application need set up two electric screwdriver, screws up the screw at both ends respectively to with the screw back off the position after accomplishing the check-up.
The work bench includes:
the working table 31 is fixedly arranged on the transmission mechanism, and the bottom of the working table is provided with a space for the transmission rail to pass through, namely the working table is fixedly arranged on the box frame 11 through a fixing column 32 and arranged across the transmission rail;
the sliding table top is provided with a vertical surface 34 and a plane 36, the plane is arranged on the upper side of the vertical surface, and the vertical surface can be arranged on the working table top in a sliding manner; the two ends of the joint of the vertical surface and the plane are fixedly connected through a reinforcing plate 35, so that the bearing capacity of the plane is improved, the fixed vertical surface and the fixed plane can be arranged on the working table top in a sliding mode through a sliding mechanism 33, meanwhile, a power source is arranged at one end of the working table top and used for driving the working table top to move, and a limit stop block is arranged at the other end of the working table top and used for limiting the maximum moving distance;
elevating system can slide and set up on vertical face, and is equipped with two electric screwdriver mountings that set up side by side, elevating system includes a connecting plate 37, the both ends of connecting plate all are equipped with the guide bar, and the guide bar of one end constitutes the cooperation of sliding with the plane, is equipped with electric screwdriver mounting 39 on its other end guide bar, just be equipped with the slide rail that perpendicular horizontal plane set up on the vertical face, one side and the slide rail of electric screwdriver mounting constitute the cooperation of sliding, the plane is equipped with the power supply that is used for driving the connecting plate lift.
The clamping mechanism comprises a clamping component 311 and a jacking component 310, the clamping component is fixedly arranged on the box frame through an I-shaped seat 312, the jacking component is arranged on two sides of the transmission rail and can jack a product to be tested on the clamping component away from the transmission rail, and a screw tightening operation of an electric screwdriver is facilitated.
The front of the clamping mechanism is provided with a liftable limiting mechanism for blocking the advancing route of the product to be detected on the transmission track.
The transfer printing detection device 7 is further arranged on the transmission rail and used for detecting the transfer printing on the surface of the product to be detected, if the transfer printing quality is detected to be unqualified, the transfer printing detection device can also automatically kick the transfer printing detection device out of the transmission rail, and the unqualified product is prevented from entering the next procedure.
The pad printing detection device 7 includes:
the limiting mechanism 48 is arranged in the advancing direction of the conveying track, can be arranged in a lifting manner, and can block the advance of the product to be detected when the limiting mechanism ascends, and comprises a lifting baffle and a power source for driving the lifting baffle to ascend and descend, wherein the lifting baffle and the limiting mechanism related in the application are of the same structure, and the action of the lifting baffle is also consistent;
the CCD camera 71 is positioned above the blocked product to be detected, can acquire the pad printing on the surface of the shell of the product to be detected, is fixedly arranged above the transmission track through a mounting bracket 73, is fixedly arranged on the mounting bracket through a camera mounting plate, and can realize the height adjustment by adjusting the position of the camera mounting plate on the mounting bracket;
the light source mechanism 72 is positioned below the CCD camera and used for providing a light source for acquiring images, adopts a low-angle scattering light source and annular distribution and gives a light source to a product to be detected, so that the CCD camera can acquire clearer images and perform pad printing quality detection on the images;
and the triggering mechanism 74 is used for detecting whether the product to be detected is positioned below the CCD camera and sending a signal for driving the CCD camera to acquire an image of the shell surface of the product to be detected, and the triggering mechanism generates a signal for triggering the CCD camera to act by adopting a sensor arranged on one side of the transmission track and detecting whether the product to be detected exists on the transmission track.
The fault piece pushing device 5 comprises a transit area 51 arranged on one side of the conveying track and a pushing mechanism 52 arranged on the other side of the conveying track, wherein the pushing mechanism adopts a push plate and a power source for driving the push plate to act, and unqualified products on the conveying track are pushed into the transit area through the push plate, so that the unqualified products are prevented from entering the next procedure.
The examples should not be construed as limiting the present invention, but any modifications made based on the spirit of the present invention should be within the scope of protection of the present invention.
Claims (9)
1. The utility model provides a from undervoltage protection ware check-up equipment is crossed to recovery formula which characterized in that: the automatic feeding device comprises a box body, wherein a feeding hole and a discharging hole are respectively formed in two ends of the box body, a transmission mechanism is arranged in the box body and connected with the feeding hole and the discharging hole, at least two detection devices controlled by independent power supplies are sequentially arranged on the transmission mechanism, and the working voltages of the independent power supplies are unequal.
2. A self-healing over-voltage and under-voltage protector verification device according to claim 1, wherein: the detection device includes:
the frame is arranged on the upper side of the transmission mechanism;
the fixing clamp is positioned at the bottom of the frame and used for fixing a product to be detected;
a contact terminal having conductivity;
the supporting frame is arranged on the upper side of the frame, can move relative to the frame and can guide the contact terminal to a detection point of a product to be detected fixed by a fixing clamp;
the driving mechanism is arranged on the upper side of the frame, is linked with the support frame and is used for driving the support frame to move away from or towards the frame;
the light guide structure is arranged on the frame, corresponds to the indicator lamp of the product to be detected fixed by the fixing clamp, and is used for transmitting the color of the indicator lamp of the product to be detected;
and the PLC control system is used for recording the color change of the indicator lamp of the product to be tested through the light guide structure in the test process and recording the product to be tested with fault indication.
3. A self-healing over-voltage and under-voltage protector verification device according to claim 2, wherein: the two sides of the transmission mechanism located at the position of the detection device are provided with lifting mechanisms used for lifting a product to be detected located on the transmission mechanism, and the bottom of the frame is provided with a clamping mechanism used for clamping the lifted product to be detected.
4. A self-healing over-voltage and under-voltage protector verification device according to claim 3, wherein: both sides all are equipped with the stop gear of liftable around the lifting mechanism.
5. A self-healing over-voltage and under-voltage protector verification device according to claim 1, wherein: the front side and the rear side of the detection device are respectively provided with a screw tightening device and a screw returning device, the screw tightening device and the screw returning device are respectively provided with two electric screw drivers which are arranged side by side, a workbench which is used for driving the electric screw drivers to ascend and descend and to move back and forth, and a clamping mechanism which is arranged on two sides of the transmission mechanism and used for fixing products to be operated.
6. The self-recovery overvoltage/undervoltage protector verification device according to claim 5, wherein: the work bench includes:
the working table is fixedly arranged on the transmission mechanism, and the bottom of the working table is provided with a space for the transmission mechanism to pass through;
the sliding table top is provided with a vertical surface and a plane, the plane is arranged on the upper side of the vertical surface, and the vertical surface can be arranged on the working table top in a sliding mode;
the lifting mechanism can be arranged on a vertical surface in a sliding mode and is provided with two electric screwdriver fixing pieces arranged side by side.
7. The self-recovery over-voltage and under-voltage protector verification device according to claim 6, wherein: elevating system includes a connecting plate, the both ends of connecting plate all are equipped with the guide bar, and the guide bar of one end constitutes the cooperation of sliding with the plane, is equipped with the electric screwdriver mounting on its other end guide bar, just be equipped with the slide rail that perpendicular horizontal plane set up on the vertical face, one side and the slide rail of electric screwdriver mounting constitute the cooperation of sliding, the plane is equipped with the power supply that is used for driving the connecting plate lift.
8. A self-healing over-voltage and under-voltage protector verification device according to claim 1, wherein: and the transmission mechanism is also provided with a pad printing detection device.
9. A self-healing over-voltage and under-voltage protector verification device according to claim 8, wherein: the pad printing detection device includes:
the limiting mechanism is arranged in the advancing direction of the conveying mechanism, can be arranged in a lifting manner, and can block the product to be detected from advancing when the limiting mechanism is lifted;
the CCD camera is positioned above the blocked product to be detected and can acquire the pad printing on the surface of the shell of the product to be detected;
the light source mechanism is positioned below the CCD camera and used for providing a light source for acquiring images;
and the trigger mechanism is used for detecting whether the product to be detected is positioned below the CCD camera and sending a signal for driving the CCD camera to acquire the image of the surface of the shell of the product to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121763532.2U CN215813133U (en) | 2021-07-30 | 2021-07-30 | Self-recovery type over-voltage and under-voltage protector calibration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121763532.2U CN215813133U (en) | 2021-07-30 | 2021-07-30 | Self-recovery type over-voltage and under-voltage protector calibration equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215813133U true CN215813133U (en) | 2022-02-11 |
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ID=80126909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121763532.2U Active CN215813133U (en) | 2021-07-30 | 2021-07-30 | Self-recovery type over-voltage and under-voltage protector calibration equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215813133U (en) |
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2021
- 2021-07-30 CN CN202121763532.2U patent/CN215813133U/en active Active
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