CN216771919U - Pressure switch calibration device for hydraulic mechanism - Google Patents
Pressure switch calibration device for hydraulic mechanism Download PDFInfo
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- CN216771919U CN216771919U CN202122952179.9U CN202122952179U CN216771919U CN 216771919 U CN216771919 U CN 216771919U CN 202122952179 U CN202122952179 U CN 202122952179U CN 216771919 U CN216771919 U CN 216771919U
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Abstract
The utility model relates to a pressure switch calibration device for a hydraulic mechanism, which belongs to the technical field of pressure switch testing and comprises a shell, and an indicating device and a detection connector which are arranged on the shell, wherein the indicating device is provided with a power supply and/or a power supply connector, the detection connector is provided with a detection terminal corresponding to a terminal of a connector on the hydraulic mechanism to be detected, and the detection terminal is connected with the indicating device and is used for connecting a pressure switch of the hydraulic mechanism to be detected in series on a power supply circuit of the indicating device when the detection connector is in butt joint with the connector on the hydraulic mechanism to be detected. The utility model not only can ensure the safety of personnel, but also relatively improves the verification efficiency, simplifies the verification operation, reduces the cost, and in addition, also improves the verification accuracy and reduces the product quality risk.
Description
Technical Field
The utility model belongs to the technical field of pressure switch testing, and particularly relates to a pressure switch calibration device for a hydraulic mechanism.
Background
The pressure switch is mainly used in a hydraulic mechanism of a 72.5kV-1100kV high-voltage switch circuit breaker, and the pressure switch is used for measuring and controlling a hydraulic signal of the circuit breaker. In prior art, pressure switch need alone lie on the ground when doing the check-up, uses universal meter or buzzer to the connector of circuit breaker mechanism bottom of the case portion, and another alone steps up or step down the operation to circuit breaker mechanism, need judge whether qualified pressure switch through the pressure value of observing on the hydraulic pressure table and listening the sound of universal meter or buzzer when stepping up or stepping down.
However, when the pressure switch is verified in the mode, due to the fact that two persons are needed to cooperate to conduct verification work, and the pressure value on the hydraulic meter needs to be observed constantly when the universal meter or the buzzer is used, the pressure switch is verified in a complex mode, efficiency is low, a tester lying on the ground can be uncomfortable due to the fact that the verification time is long, the head of the tester is located on the lower portion of the breaker mechanism box, the tester is prone to colliding, and the potential safety hazard is large.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a pressure switch calibration device for a hydraulic mechanism, which aims to solve the problems of complex operation, low efficiency and potential safety hazard in the process of calibrating a pressure switch in the prior art.
In order to achieve the purpose, the pressure switch calibration device for the hydraulic mechanism adopts the following technical scheme:
the utility model provides a pressure switch calibration equipment for hydraulic mechanism, includes the casing and locates the indicating device and the detection connector of casing, indicating device disposes power and/or power connection, it has the detection terminal that corresponds with the terminal of waiting to detect the connector on the hydraulic mechanism to detect the connector, it is connected with indicating device to detect the terminal for when detecting the connector and waiting to detect the connector butt joint on the hydraulic mechanism, will wait to detect the pressure switch tandem connection of hydraulic mechanism on indicating device's power supply circuit.
The beneficial effects of the above technical scheme are that: the pressure switch checking device for the hydraulic mechanism is arranged, so that when the pressure switch is checked, the detection connector of the pressure switch checking device for the hydraulic mechanism can be butted with the connector on the hydraulic mechanism to be detected through the detection connector of the pressure switch checking device for the hydraulic mechanism, the detection connector of the pressure switch checking device for the hydraulic mechanism is provided with the detection terminal connected with the indicating device, the detection terminal corresponds to the terminal of the detection connector on the hydraulic mechanism to be detected, the pressure switch of the hydraulic mechanism to be detected can be connected in series on the power supply circuit of the indicating device through the detection terminal, and the indicating device can display whether the pressure switch is qualified or not through the on-off of the power supply circuit, so that the aim of checking the pressure switch is fulfilled. Compared with the prior art, the utility model reduces the 2-person collaborative test into 1-person implementation, saves manpower, simultaneously does not need to lie on the ground for operation by one person, avoids collision between a tester and the hydraulic mechanism to be tested, and ensures the safety of personnel. And the calibration device can complete all calibration work of the pressure switch only by once boosting or reducing the voltage, thereby relatively improving the calibration efficiency, simplifying the calibration operation and reducing the cost. Compare in addition and listen to the sound of universal meter or bee calling organ when observing the hydraulic pressure table and come the manual judgement pressure switch qualified or not, through indicating device's demonstration for the testing result is also more accurate, has reduced the product quality risk, is favorable to improving product quality.
Further, the indicating device is a plurality of indicating lamps, and the plurality of indicating lamps are used for corresponding to a plurality of pressure switches on the hydraulic mechanism to be detected.
The beneficial effects of the above technical scheme are that: therefore, the cost is relatively reduced by setting the indicating device as the indicating lamp on the basis of ensuring whether the pressure switch is qualified or not.
Further, the plurality of indicator lights are all located on the same face of the housing.
The beneficial effects of the above technical scheme are that: all set up a plurality of pilot lamps on the same face of casing, the convenience is lighted or is extinguished to a plurality of pilot lamps and observes like this.
Further, the plurality of indicator lights are arranged in a row in a lighting-on or lighting-off sequence.
The beneficial effects of the above technical scheme are that: whether the pressure switch is qualified or not is judged conveniently by operators by observing the sequential lighting or lighting-off of the indicator lamps, and the pressure switch is relatively convenient to check.
Furthermore, a mark position is arranged beside the indicator light and used for marking display information of the indicator light.
The beneficial effects of the above technical scheme are that: therefore, all the expressed information of the lighting or the light-out of the indicator light can be determined, the misjudgment of operators is avoided, meanwhile, the pressure switch is convenient to check, and the working efficiency is improved.
Further, the detection connector is in sealing fit with the shell.
The beneficial effects of the above technical scheme are that: therefore, the sealing effect inside the shell can be ensured, external dust and water are prevented from entering the shell to influence the normal use of each element in the shell, and the normal use of the pressure switch calibration device for the hydraulic mechanism is ensured.
Further, the indicating device and the detection connector are respectively positioned on two adjacent surfaces of the shell.
The beneficial effects of the above technical scheme are that: therefore, the arrangement of the cable connected with the detection connector is facilitated, and the arrangement of the cable is more orderly and attractive.
Further, the shell is filled with a shock-absorbing material.
The beneficial effects of the above technical scheme are that: the damping material is filled in the shell, so that collision among all elements in the shell can be prevented, damage to all the elements is avoided, all the elements in the shell can be kept stable, and the stable performance of the whole checking device is further guaranteed.
Further, the shell is a waterproof shell.
The beneficial effects of the above technical scheme are that: set up the casing into waterproof casing, can avoid like this that the outer water of casing gets into and causes the damage to each component in the casing, and then causes the damage to whole pressure switch verifying attachment for the hydraulic pressure mechanism, increase the safeguard effect of pressure switch verifying attachment for the hydraulic pressure mechanism promptly.
Furthermore, the pressure switch calibration device for the hydraulic mechanism further comprises a matched adapter cable.
The beneficial effects of the above technical scheme are that: therefore, a cable matched with the detection connector is not required to be additionally configured, and the use of the calibration device of the pressure switch for the hydraulic mechanism is facilitated.
Drawings
FIG. 1 is a plan view of a pressure switch verifying unit for a hydraulic mechanism according to the present invention;
FIG. 2 is a side view of the pressure switch verifying unit for a hydraulic mechanism according to the present invention;
fig. 3 is a front view of the pressure switch verifying unit for a hydraulic mechanism in the present invention;
FIG. 4 is an electrical schematic diagram of the pressure switch verification device for a hydraulic mechanism according to the present invention;
FIG. 5 is a diagram showing the connection relationship among the power source, the indicator light and the detection connector in the pressure switch calibration apparatus for a hydraulic mechanism according to the present invention;
FIG. 6 is a diagram showing the connection relationship between the pressure switches S1, S2 and S3 and the connector C of the hydraulic mechanism to be tested in the present invention;
fig. 7 is a diagram showing the connection relationship between the pressure switches S4, S5 and S6 and the connector D of the hydraulic mechanism to be tested in the present invention.
In the figure: 1. a housing; 2. a first detection connector; 3. a second detection connector; 4. a first indicator light; 5. a second indicator light; 6. a third indicator light; 7. a fourth indicator light; 8. a fifth indicator light; 9. and a sixth indicator light.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is to be noted that, in the embodiments of the present invention, relational terms such as "first" and "second", and the like, which may be present in the terms of the first and second, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, which may be present, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the appearances of the phrase "comprising an … …" or similar limitation may be present without necessarily excluding the presence of additional identical elements in the process, method, article, or apparatus that comprises the same elements.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
The present invention will be described in further detail with reference to examples.
as shown in fig. 1, 2, and 3, the pressure switch verification device for a hydraulic mechanism includes a housing 1, and an indicating device and a detection connector provided on the housing 1. The hydraulic operating mechanism comprises a shell 1, an indicating device, a first indicating lamp 4, a second indicating lamp 5, a third indicating lamp 6, a fourth indicating lamp 7, a fifth indicating lamp 8 and a sixth indicating lamp 9, wherein the indicating device is arranged on the shell 1, the six indicating lamps correspond to six pressure switches of the hydraulic operating mechanism respectively, and in the hydraulic operating mechanism, the six switches are used for providing different operating mechanism alarming or control signals, specifically a reclosing locking I signal, a reclosing locking II signal, a low oil pressure alarming signal, a closing locking signal, an opening locking I signal and an opening locking II signal respectively. The pressure values required by closing of the pressure switches are not all equal, specifically, the pressure set values of the pressure switches corresponding to the reclosing lock I signal and the pressure switches corresponding to the reclosing lock II signal are the same, the pressure set values of the pressure switches corresponding to the opening lock I signal and the pressure switches corresponding to the opening lock II signal are the same, and the pressure set values of the pressure switches corresponding to the low oil pressure alarm signal and the closing lock signal are different. In this embodiment, the first indicator light 4 corresponds to a pressure switch of a reclosing lock signal i, the second indicator light 5 corresponds to a pressure switch of a reclosing lock signal ii, the third indicator light 6 corresponds to a pressure switch of a low oil pressure alarm signal, the fourth indicator light 7 corresponds to a pressure switch of a closing lock signal, the fifth indicator light 8 corresponds to a pressure switch of a separating lock signal i, and the sixth indicator light 9 corresponds to a pressure switch of a separating lock signal ii.
As shown in fig. 3, the six indicator lights are all located on the same side of the housing 1, and the six indicator lights are arranged in three rows in the lighting or lighting-off order, wherein the first indicator light 4 and the second indicator light 5 are in one row, the third indicator light 6 and the fourth indicator light 7 are in one row, and the fifth indicator light 8 and the sixth indicator light 9 are in one row. And marking positions are arranged beside the six indicating lamps and used for marking display information of the indicating lamps. The indicator lamps are provided with a power supply which is a 9V battery (not shown) placed in a battery box (not shown), the battery box is installed in the housing 1, and the 9V battery is respectively connected with the six indicator lamps through cables.
As shown in fig. 1, the detection connector includes a first detection connector 2 and a second detection connector 3, the first detection connector 2 and the second detection connector 3 are both fixed on the same side surface of the housing 1, and are respectively located on two adjacent surfaces of the housing 1 with six indicator lights, and in addition, the first detection connector 2 and the second detection connector 3 are also both in sealing fit with the housing 1.
The first detection connector 2 and the second detection connector 3 each have a detection terminal corresponding to a terminal of a connector on the hydraulic mechanism to be detected, but the first detection connector 2 and the second detection connector 3 are two different connectors and cannot be used in common. As shown in fig. 5, the first detection connector 2 is a, the second detection connector 3 is B, the first detection connector 2 has four detection terminals, a1, a2, a3 and a4, wherein a1, a2 and a3 are respectively connected to the positive pole of the power supply, a4 is connected to the negative pole of the power supply, indicator lights L1, L3 and L5 are respectively connected in series to the connection circuits of a1, a2 and a3 to the positive pole of the power supply, and indicator lights L1, L3 and L5 respectively correspond to the first indicator light 4, the third indicator light 6 and the fifth indicator light 8. The second detection connector 3 also has four detection terminals, which are b1, b2, b3 and b4, wherein b1, b2 and b3 are connected to the positive pole of the power supply, b4 is connected to the negative pole of the power supply, indicator lights L2, L4 and L6 are connected in series to the connection circuit of b1, b2 and b3 to the positive pole of the power supply, and indicator lights L2, L4 and L6 correspond to the second indicator light 5, the fourth indicator light 7 and the sixth indicator light 9, respectively.
As shown in fig. 6, the connector C on the hydraulic mechanism to be detected has four terminals, namely C1, C2, C3 and C4, wherein pressure switches S1, S3 and S5 are respectively connected to C1, C2 and C3, and pressure switches S1, S3 and S5 are connected to C4 opposite to the other ends connected to C1, C2 and C3. As shown in fig. 7, the connector D on the hydraulic mechanism to be detected has four terminals D1, D2, D3 and D4, wherein one ends of the pressure switches S2, S4 and S6 are respectively connected to D1, D2 and D3, and the other ends of the pressure switches S2, S4 and S6 which are connected to D1, D2 and D3 are connected to D4.
When the first detecting connector 2 (i.e., detecting connector a) is mated with connector C, the detecting terminals a1, a2, a3 and a4 are connected correspondingly to the terminals C1, C2, C3 and C4, respectively, whereby the pressure switches S1, S3 and S5 can be connected in series to the power supply circuits of the indicator lamps L1, L3 and L5, respectively. When the second detecting connector 3 (i.e., detecting connector B) is mated with connector D, the detecting terminals B1, B2, B3 and B4 are respectively connected to the terminals D1, D2, D3 and D4, so that the pressure switches S2, S4 and S6 can be respectively connected in series to the power supply circuits of the indicator lights L2, L4 and L6, and the electrical schematic diagrams of the first detecting connector 2 and the connector C and the second detecting connector 3 mated with connector D are shown in fig. 4.
In addition, the first detection connector 2 and the second detection connector 3 are provided with locking nuts, and the locking nuts can ensure that the detection connectors are in good contact and are not easy to fall off.
All pack around and between each component of each component in the casing 1 has shock-absorbing material, and shock-absorbing material can weaken the damage to each component of inside when pressure switch verifying attachment for hydraulic pressure mechanism shakes, guarantees whole pressure switch verifying attachment for hydraulic pressure mechanism's stable performance, and each component in the casing 1 all uses welding and bolt to fix. The pressure switch calibration device for the hydraulic mechanism is also matched with the adapter cable, so that cables matched with all detection connectors do not need to be additionally configured, and the pressure switch calibration device for the hydraulic mechanism is convenient to use.
In addition, each element in the shell 1 adopts standard parts and existing elements, so that the whole pressure switch verifying device for the hydraulic mechanism is low in manufacturing cost and easy to manufacture.
In addition, it should be noted that the pressure switch calibration device for a hydraulic mechanism of the present invention can increase its expansibility by different module combinations, so that the pressure switch calibration device for a hydraulic mechanism can be used for calibration of various types of pressure switches. The pressure switch calibration device for the hydraulic mechanism is designed into an integrated structure, and the overall size of the shell is comprehensively determined according to the internal structure and the element size.
The working principle of the pressure switch calibration device for the hydraulic mechanism in the utility model is as follows:
when the pressure switch is tested, the first detection connector 2 and the second detection connector 3 are respectively butted with the connector C and the connector D of the hydraulic mechanism to be detected. After the butt joint is completed, the hydraulic mechanism to be detected is subjected to pressure reduction through a pressure release valve of the hydraulic mechanism to be detected, the pressure switch is communicated with a hydraulic loop of the hydraulic mechanism to be detected and is a travel switch, so that in the process of reducing the pressure in the hydraulic mechanism to be detected, when the pressure in the hydraulic mechanism to be detected reaches a pressure set value of the pressure switch, under the action of the pressure, the free end of an elastic element inside the pressure switch can move, the pressure switch is closed by pushing the switch element, signals can be sent to a background after the pressure switch is closed, so that the next-step sequence control is carried out, an indicator lamp on the same power supply circuit with the pressure switch is turned on while the pressure switch is closed, and whether the pressure switch is qualified or not can be judged by turning on the indicator lamp. Because each pilot lamp is arranged according to the order of lighting, consequently along with waiting to detect the reduction of hydraulic pressure mechanism internal pressure, pressure switch closes in proper order, and the pilot lamp lights in proper order, and the order of lighting of pilot lamp is: first, the first indicator light 4 and the second indicator light 5 are simultaneously lighted, or are sequentially lighted, then the third indicator light 6 and the fourth indicator light 7 are sequentially lighted, and finally, the fifth indicator light 8 and the sixth indicator light 9 are simultaneously lighted, or are sequentially lighted. When the first indicator light 4 and the second indicator light 5 are sequentially turned on, the time difference between the sequential turning-on of the first indicator light 4 and the sequential turning-on of the second indicator light 5 is small, and the time difference between the sequential turning-on of the fifth indicator light 8 and the sequential turning-on of the sixth indicator light 9 is small.
When the hydraulic mechanism to be detected needs to be boosted, the hydraulic mechanism to be detected is pressed through a motor loop communicated with the hydraulic loop of the hydraulic mechanism to be detected, six indicator lights are sequentially turned off in the process that the pressure of the hydraulic mechanism to be detected gradually rises, whether the pressure switch is qualified or not is judged by observing the turning-off of the indicator lights, and the turning-off sequence of the six indicator lights is opposite to the turning-on sequence of the six indicator lights in the step-down process.
Wait to detect the in-process that hydraulic pressure mechanism carried out step-down or step-up once, only need alone through observing whether the pilot lamp lights or extinguish alright accomplish pressure switch's check-up to only need carry out step-up once or step-down alright accomplish all check-up work of pressure switch.
According to the utility model, by arranging the pressure switch calibration device for the hydraulic mechanism, the calibration of the pressure switch of the hydraulic mechanism to be detected is performed by 2 people in the past in a cooperative test mode, the implementation is reduced to 1 person, the manpower is saved, meanwhile, the operation of lying on the ground by one person is not needed, the collision between a tester and the hydraulic mechanism to be detected is avoided, and the safety of the personnel is ensured. And every time the pressure switch check man-hour of a product is finished is reduced from 2H and 2 persons/platform to 0.5H and 1 person/platform, the production efficiency is improved by about 300 percent, the check man-hour of the pressure switch of 1 product can be saved by 1.5H, if about 400 products are produced averagely every year, the check man-hour can be saved by 600 hours every year, the check man-hour cost can be saved by 12 ten thousand yuan, and the cost is reduced. In addition, compared with the method that whether the pressure switch is qualified is judged manually by listening to the sound of a multimeter or a buzzer while observing the hydraulic gauge, the detection result is more accurate through the display of the indicating device, the product quality risk is reduced, the product quality is favorably improved, and meanwhile, the pressure switch checking device for the hydraulic mechanism is simple in structure and stable and reliable in performance.
the present embodiment is different from embodiment 1 in that the indicating apparatus is provided with a power supply in embodiment 1. In this embodiment, the indication device is configured with a power connector.
the present embodiment is different from embodiment 1 in that the indicating apparatus is provided with a power supply in embodiment 1. In this embodiment, the indicating device is provided with a power supply and a power connector.
the present embodiment is different from embodiment 1 in that, in embodiment 1, the indicating device is a plurality of indicating lamps. In this embodiment, the indicating device is a display screen, and the display screen can display the on-off state of the pressure switch.
the present embodiment is different from embodiment 1 in that, in embodiment 1, the indicating device and the detection connector are respectively located on two adjacent surfaces of the housing 1. In the present embodiment, the indicating device and the detecting connector are located on the same plane of the housing 1.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (10)
1. The utility model provides a pressure switch calibration equipment for hydraulic pressure mechanism, its characterized in that includes casing (1) and locates indicating device and the detection connector of casing (1), indicating device disposes power and/or power connection, the detection connector has the detection terminal that corresponds with the terminal of waiting to detect the connector on the hydraulic pressure mechanism, the detection terminal is connected with indicating device for when detecting the connector and waiting to detect the connector butt joint on the hydraulic pressure mechanism, will wait to detect the pressure switch of hydraulic pressure mechanism and concatenate on indicating device's supply circuit.
2. The pressure switch calibration device for the hydraulic unit according to claim 1, wherein the indicating device is a plurality of indicating lamps, and the plurality of indicating lamps are used for corresponding to a plurality of pressure switches on the hydraulic unit to be tested.
3. The pressure switch calibrating device for a hydraulic unit according to claim 2, wherein the plurality of indicator lights are all located on the same plane of the housing (1).
4. The pressure switch checker for hydraulic units according to claim 3, wherein said plurality of indicator lights are arranged in a row in a light-on or light-off sequence.
5. The pressure switch calibration device for the hydraulic mechanism according to any one of claims 1 to 4, wherein a marking position is provided beside the indicator light, and the marking position is used for marking display information of the indicator light.
6. A pressure switch verification device for hydraulic mechanisms according to any one of claims 1 to 4, characterized in that the detection connector is in sealing engagement with the housing (1).
7. The pressure switch calibration device for the hydraulic mechanism according to any one of claims 1 to 4, wherein the indicating device and the detection connector are respectively located on two adjacent surfaces of the housing (1).
8. The pressure switch calibration device for the hydraulic mechanism according to any one of claims 1 to 4, wherein the housing (1) is filled with a shock-absorbing material.
9. The pressure switch calibration device for a hydraulic mechanism according to any one of claims 1 to 4, wherein the housing (1) is a waterproof housing.
10. The pressure switch calibration device for the hydraulic mechanism according to any one of claims 1 to 4, wherein the pressure switch calibration device for the hydraulic mechanism further comprises a matched adapter cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122952179.9U CN216771919U (en) | 2021-11-29 | 2021-11-29 | Pressure switch calibration device for hydraulic mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122952179.9U CN216771919U (en) | 2021-11-29 | 2021-11-29 | Pressure switch calibration device for hydraulic mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216771919U true CN216771919U (en) | 2022-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122952179.9U Active CN216771919U (en) | 2021-11-29 | 2021-11-29 | Pressure switch calibration device for hydraulic mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216771919U (en) |
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2021
- 2021-11-29 CN CN202122952179.9U patent/CN216771919U/en active Active
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