CN219672823U - Air pump circuit, air pump device and laser engraving machine - Google Patents
Air pump circuit, air pump device and laser engraving machine Download PDFInfo
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- CN219672823U CN219672823U CN202320868224.9U CN202320868224U CN219672823U CN 219672823 U CN219672823 U CN 219672823U CN 202320868224 U CN202320868224 U CN 202320868224U CN 219672823 U CN219672823 U CN 219672823U
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- 238000010147 laser engraving Methods 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 53
- 230000000737 periodic effect Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
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- 239000002184 metal Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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Abstract
The utility model provides an air pump circuit, an air pump device and a laser engraving machine. The air pump circuit comprises a main control circuit, a driving circuit, a detection circuit and a direct current power supply; the control signal is output from the main control circuit to the driving circuit, and the driving circuit forms a periodic driving signal and outputs the periodic driving signal so as to drive the air pump to work; the detection signal is output from the detection circuit to the driving circuit, the driving circuit is configured to acquire the working current of the air pump according to the detection signal, and when the working circuit is larger than a current threshold value, the driving circuit adjusts the driving signal output in the current period; the direct current power supply is used for providing direct current for the air pump circuit. The utility model can realize the adjustment of the air flow output by the air pump.
Description
Technical Field
The utility model relates to the field of laser engraving, in particular to an air pump circuit, an air pump device and a laser engraving machine.
Background
Currently, air pumps on the market are few in variety, single in function and mainly comprise alternating current electromagnetic air pumps. The alternating current electromagnetic air pump is divided into two types, one type is directly connected with the mains supply, the voltage is high, the air pump shell is made of metal, certain potential safety hazards exist, users are required to conduct grounding treatment, and installation is troublesome; another is to change the low-voltage direct current (such as DC 24V) into alternating current by an inverter circuit and output the alternating current to a low-voltage alternating current electromagnetic air pump (such as AC 24V), which has the defect of unadjustable air flow.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides an air pump circuit, an air pump device and a laser engraving machine, which are high in safety and can adjust the air flow of the air pump.
The utility model provides an air pump circuit which controls the work of an air pump, wherein the air pump circuit comprises a main control circuit, a driving circuit, a detection circuit and a direct current power supply;
the control signal is output from the main control circuit to the driving circuit, and the driving circuit forms a periodic driving signal and outputs the periodic driving signal so as to drive the air pump to work;
a detection signal is output from the detection circuit to a driving circuit, the driving circuit is configured to acquire the working current of the air pump according to the detection signal, and when the working current is larger than a current threshold value, the driving circuit adjusts the driving signal output in the current period;
the direct current power supply is used for providing direct current for the air pump circuit.
In an embodiment, the detection circuit is a current detection circuit, and the current detection circuit comprises a detection resistor electrically connected with the air pump;
the detection circuit outputs a detection signal according to the detection resistor.
In an embodiment, the air pump circuit further comprises:
a reference voltage input circuit for inputting a reference voltage;
the driving circuit is electrically connected with the reference voltage input circuit to acquire the reference voltage; the driving circuit determines the current threshold according to the reference voltage and the detection resistor.
In one embodiment, the reference voltage input circuit comprises:
one end of the first resistor is used for being connected with a power supply voltage, and the other end of the first resistor is electrically connected with the driving circuit;
and the first end of the variable resistor is electrically connected with the other end of the first resistor, and the second end of the variable resistor is grounded.
In an embodiment, the master control circuit is configured to output the control signals having different frequencies and duty cycles according to different settings.
In an embodiment, the air pump circuit further comprises an output interface; the output interface is used for being electrically connected with the air pump.
In an embodiment, the air pump circuit further comprises a filter circuit;
the filter circuit comprises a first filter circuit, wherein the input end of the first filter circuit is used for being connected with the direct current power supply, and the output end of the first filter circuit is electrically connected with the power supply end of the driving circuit; the first filter circuit is used for filtering the direct-current power supply;
and/or the filter circuit comprises a second filter circuit, wherein the input end of the second filter circuit is electrically connected with the output end of the driving circuit, and the output end of the second filter circuit is electrically connected with the output interface; the second filter circuit is used for filtering the driving signal.
In an embodiment, the air pump circuit further comprises:
the input end of the interface protection circuit is electrically connected with the output end of the driving circuit, and the output end of the interface protection circuit is electrically connected with the output interface;
the interface protection circuit comprises a first diode and a first capacitor; the negative electrode of the first diode is electrically connected with the first end of the first capacitor to form the input end of the interface protection circuit, and the positive electrode of the first diode is electrically connected with the second end of the first capacitor to form the output end of the interface protection circuit.
The present utility model also proposes an air pump device comprising:
an air pump;
the air pump circuit is electrically connected with the air pump;
the air pump circuit is used for periodically outputting a driving signal to drive the air pump to work;
the air pump circuit is also used for detecting the working current of the air pump and stopping outputting a driving signal in the current period when the working current value is larger than the current threshold value.
The utility model also provides a laser engraving machine, which comprises the air pump device.
The utility model supplies power to the driving circuit through the direct current power supply, and the driving circuit can periodically output driving signals to drive the air pump to work according to the control signals. Meanwhile, a detection signal is output through the detection circuit, so that the driving circuit obtains the actual working current of the air pump, and when the working current is larger than a current threshold value, the driving signal is stopped to be output in the current period, so that the air pump can output set air flow, and software driving control of the air pump and air flow adjustment are realized.
Drawings
Fig. 1 is a schematic diagram of an air pump circuit according to an embodiment of the utility model.
Fig. 2 is a schematic structural diagram of an embodiment of an output interface of the present utility model.
Fig. 3 is a schematic diagram of a driving circuit according to an embodiment of the utility model.
FIG. 4 is a schematic diagram of an embodiment of a reference voltage input circuit according to the present utility model.
Fig. 5 is a schematic diagram of a filter circuit according to an embodiment of the utility model.
Fig. 6 is a schematic diagram of an interface protection circuit according to an embodiment of the utility model.
Fig. 7 is a schematic structural view of an embodiment of the air pump device of the present utility model.
Description of the main reference signs
Output interface 110 of air pump circuit 100
The driving circuit 120 detects the circuit 130
Reference voltage input circuit 140 first resistor R1
Variable resistor R2 filter circuit 150
Interface protection circuit 160 master control circuit 170
Air pump device 10 air pump 200
Detection resistor R3 first diode D1
First capacitor C1 temperature detection circuit 180
First filter circuit 151 of DC power supply 190
The second filter circuit 152
The utility model will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
The following description will make reference to the accompanying drawings to more fully describe the utility model. Exemplary embodiments of the present utility model are illustrated in the accompanying drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. Like reference numerals designate identical or similar components.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, as used herein, "comprises" and/or "comprising" and/or "having," integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, and/or groups thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. Furthermore, unless the context clearly defines otherwise, terms such as those defined in a general dictionary should be construed to have meanings consistent with their meanings in the relevant art and the present disclosure, and should not be construed as idealized or overly formal meanings.
The following description of exemplary embodiments will be provided with reference to the accompanying drawings. It is noted that the components depicted in the referenced figures are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.
Referring to fig. 1, the present utility model proposes an air pump circuit 100, wherein the air pump circuit 100 includes a main control circuit 170, a driving circuit 120, a detecting circuit 130 and a dc power supply 190;
a control signal is output from the main control circuit 170 to the driving circuit 120, and a periodic driving signal is formed by the driving circuit 120 and output to drive the air pump 2000 to operate;
a detection signal is output from the detection circuit 130 to a driving circuit 120, the driving circuit 120 is configured to acquire an operation current of the air pump 2000 according to the detection signal, and when the operation circuit is greater than a current threshold, the driving circuit 120 adjusts the driving signal output in a current period;
the dc power supply 190 is configured to supply dc power to the air pump circuit.
The driving circuit 120 has a power terminal, an input terminal, an output terminal and a detection terminal, and the power terminal of the driving circuit 120 is used for connecting to a dc power supply 190, for example, the dc power supply 190 may be a 12V dc power supply 190 or a 24V dc circuit. The input end of the driving circuit 120 is used for receiving a control signal, and the output end of the driving circuit 120 is used for being electrically connected with the air pump 200; the control signal forms a periodic driving signal after passing through the driving circuit 120, and is output to the air pump 200; the driving signal is used for driving the air pump 2000 to work;
the detection circuit 130 is electrically connected with the detection end of the driving circuit 120; as one example, the detection circuit 130 is a current detection circuit for detecting an operation current of the air pump 2000. The detection circuit 130 may be implemented by using a resistor, for example, referring to fig. 3, where the detection circuit 130 includes a detection resistor R3, and the detection resistor R3 is configured to output a detection signal according to an operating current of the air pump. The driving circuit 120 is further configured to compare the operating current value with a current threshold value, and adjust a driving signal output in a current period when the operating current value is greater than the current threshold value.
Of course, in other embodiments, the detection circuit 130 may take other forms, so long as the driving circuit 120 can obtain the working current of the air pump according to the detection signal output by the driving circuit.
Further, the air pump circuit further includes an output interface 110, the output interface 110 is configured to be electrically connected to the air pump 2000, and the driving signal can be transmitted to the air pump through the output interface 110. The output interface 110 may be a TTL level interface, a CMOS level interface, an ECL level interface, an RS-232 level interface, etc., which is not limited by the present utility model.
In this embodiment, the main control circuit 170 may be an MCU, or other chips capable of outputting PWM signals, which is not limited in the present utility model.
For example, the driving circuit 120 may include a signal receiving circuit and a control chip. Referring to a IN fig. 3, IO1 and IO2 are control signal inlets, and PWM signals are input to a signal receiving circuit from IO1 and IO2, converted, and output to a control chip from IN1 and IN 2. Referring to b in fig. 3, the control chip outputs a corresponding driving signal according to the received PWM signal, and outputs to the output interface 110 through OUT1 and OUT 2. Referring to fig. 2, the driving signals are output to the air pump 2000 via OUT1 and OUT2 of the output interface 110. The driving signal may refer to a pulse signal output according to the PWM signal. For example, the main control circuit 170 outputs a PWM signal with a corresponding frequency and duty ratio according to the set air flow, and the driving circuit 120 periodically outputs a pulse signal according to the PWM signal to drive the air pump 2000 to operate, so as to control the air pump 2000 to output the air flow with the set air flow. Meanwhile, the detection circuit 130 outputs a detection signal according to the operation current of the air pump 2000. It will be appreciated that the greater the operating current of the air pump 2000, the greater the amount of air flow. When the operation current of the air pump 2000 is less than the current threshold, it is indicated that the air flow rate of the air pump 2000 is less than the set air flow rate. At this time, the driving circuit 120 continues to output the pulse signal in accordance with the PWM signal until the air flow rate reaches the set air flow rate. When the operation current of the air pump 2000 is greater than the current threshold, it is indicated that the air flow of the air pump 2000 is greater than or equal to the set air flow. At this time, the driving circuit 120 stops outputting the pulse signal in the current period to control the air pump 2000 to stop outputting the air flow in the current period until the next PWM signal period, and the driving circuit 120 starts outputting the pulse signal again to adjust the driving signal in the current period. Wherein the current threshold may be set according to a set airflow.
For example, in the first signal period, it is detected that the operation current of the air pump 2000 is always smaller than the current threshold, and the driving circuit 120 continuously outputs the pulse signal according to the PWM signal; in the second signal period, the operating current of the air pump 2000 is detected to be greater than the current threshold at time T1, and the driving circuit 120 stops outputting the pulse signal until the third signal period starts outputting the pulse signal. In this way, the driving circuit 120 outputs the chopping driving signal according to the PWM signal and the current threshold value to drive the air pump 2000 to work, so as to realize the software driving control of the air pump 2000 and the regulation of air flow.
Further, the master circuit 170 is configured to output the control signals, such as PWM signals, having different frequencies and duty cycles according to different settings. The air flow amount of the air pump 2000 may be adjusted by adjusting parameters such as the frequency and the duty ratio of the control signal (PWM signal). For example, increasing the frequency of the control signal and correspondingly increasing the frequency of the driving signal increases the energization time of the air pump 2000 in one signal period, i.e., the operating time of the air pump 2000 increases, and thus the output air flow of the air pump 2000 increases. In addition, the air flow amount of the air pump 2000 may be adjusted by adjusting the magnitude of the current threshold. For example, the current threshold is increased, the current of the air pump 2000 may be increased in one signal period, and the energization period is increased, that is, the operation time of the air pump 2000 is increased, and thus the output air flow of the air pump 2000 is increased.
The present utility model supplies the operation power to the driving circuit 120 through the dc power supply 190 so that it can periodically output the driving signal according to the control signal to drive the air pump 2000 to operate. Meanwhile, the detection circuit 130 detects the actual working current of the air pump 2000, and when the working current is larger than the current threshold, the output of the driving signal in the current period is stopped, so that the air pump 2000 can output the set air flow, and the software driving control of the air pump and the adjustment of the air flow are realized.
In one embodiment, the air pump circuit 100 further includes a reference voltage input circuit 140.
The reference voltage input circuit 140 is electrically connected with the driving circuit 120; the reference voltage input circuit 140 is used for inputting a reference voltage. The driving circuit 120 is further configured to determine the current threshold according to the reference voltage.
In this embodiment, the current threshold value may be adjusted by adjusting the reference voltage value. For example, increasing the reference voltage value, the current threshold increases; the reference voltage value is reduced and the current threshold is reduced.
As shown in fig. 4, the reference voltage input circuit 140 includes:
a first resistor R1, wherein one end of the first resistor R1 is used for accessing a power supply voltage, and the other end of the first resistor R1 is electrically connected with the driving circuit 120;
and a variable resistor R2, wherein a first end of the variable resistor R2 is electrically connected with the other end of the first resistor R1, and a second end of the variable resistor R2 is grounded.
In this embodiment, the variable resistor R2 may be realized by using a dial potentiometer or a digital potentiometer. The power supply voltage is divided by the first resistor R1 and the variable resistor R2 to generate a reference voltage, and the reference voltage is output to the driving circuit 120. The drive circuit 120 sets a current threshold according to the reference voltage:
wherein I is Trip (A) Is the current threshold, V REF (V) is the reference voltage value, A V To calculate a factor (i.e. current gain, constant A V ＝V REF /I SEN /R SEN )，R LSEN (Ω) is the resistance of the detection resistor R3 of the detection circuit 130.
The driving circuit 120 determines a current threshold value according to the reference voltage and the detection resistor R3 of the detection circuit 130, and controls the output of the driving signal according to the current threshold value. By adjusting the resistance value of the variable resistor R2, the divided voltage value between the variable resistor R2 and the first resistor R1 changes, that is, the reference voltage value changes, and the current threshold correspondingly changes, so that the duration of the driving signal output by the driving circuit 120 in one signal period is adjusted, the actual working duration of the air pump 2000 in one signal period correspondingly changes, and the adjustment of the output air flow of the air pump 2000 is realized. For example, increasing the resistance value of the variable resistor R2, increasing the reference voltage, increasing the current threshold, increasing the duration of the drive signal output by the drive circuit 120 in one signal period, increasing the actual operating duration of the air pump 2000 in one signal period, and eventually increasing the output air flow of the air pump 2000.
In one embodiment, the air pump circuit 100 further includes a filter circuit 150.
The filter circuit 150 includes a first filter circuit 151, an input end of the first filter circuit 151 is used for being connected to the dc power supply 190, and an output end of the first filter circuit 151 is electrically connected to a power supply end of the driving circuit 120; the first filter circuit 151 is configured to filter the dc power supply 190, so that the signal of the dc power supply 190 is smoother.
And/or, the filter circuit 150 includes a second filter circuit 152, an input end of the second filter circuit 152 is electrically connected to an output end of the driving circuit 120, and an output end of the second filter circuit 152 is electrically connected to the output interface 110; the second filter circuit 152 is configured to filter the driving signal to make the driving signal smoother.
As shown in fig. 5, the first filter circuit 151 and the second filter circuit 152 may be implemented by using capacitors.
In one embodiment, the air pump circuit 100 further comprises:
an interface protection circuit 160, wherein an input end of the interface protection circuit 160 is electrically connected with an output end of the driving circuit 120, and an output end of the interface protection circuit 160 is electrically connected with the output interface 110;
as shown in fig. 6, the interface protection circuit 160 includes a first diode D1 and a first capacitor C1; the negative electrode of the first diode D1 is electrically connected with the first end of the first capacitor C1 to form the input end of the interface protection circuit 160, and the positive electrode of the first diode D1 is electrically connected with the second end of the first capacitor C1 to form the output end of the interface protection circuit 160.
In this embodiment, the first diode D1 may be implemented as a transient diode. When the two poles of the TVS diode are impacted by reverse transient high energy, the high resistance between the two poles can be changed into low resistance, the surge power of hundreds of watts is absorbed, the voltage clamp between the two poles is positioned at a preset value, and the precise components in the electronic circuit are effectively protected from being damaged by various surge pulses. Thus, when the output interface 110 is connected with the air pump 2000 in a wrong way or the working current of the air pump 2000 is too high, the interface protection circuit 160 can effectively avoid the damage of the air pump circuit 100 caused by large current. The number of the interface protection circuits 160 may be plural.
In one embodiment, the main control circuit 170 is further configured to detect a current at an output terminal electrically connected to the driving circuit 120. If the output end is detected to be short-circuited, the output end of the main control circuit 170 outputs a high resistance state and turns off the output to protect the main control circuit 170 from being burnt out. This latch state can only be eliminated by powering up the master circuit 170 again.
The air pump circuit 100 further includes a temperature detection circuit 180 for detecting an operating temperature of the main control circuit 170. The main control circuit 170 is further configured to stop outputting the control signal when the operating temperature exceeds the temperature threshold, and to re-output the control signal when the operating temperature falls below the temperature threshold.
Referring to fig. 7, the present utility model also proposes an air pump device 10, the air pump device 10 including an air pump 2000 and the air pump circuit 100 described above.
The air pump circuit 100 is electrically connected to the air pump 2000 assembly. The air pump circuit 100 is configured to periodically output a driving signal to drive the air pump 2000 assembly to operate. The air pump circuit 100 is further configured to detect an operation current of the air pump 2000, and stop outputting a driving signal in a current period when the operation current value is greater than the current threshold.
The detailed structure of the air pump circuit 100 can refer to the above embodiments, and will not be described herein; it is to be understood that, since the air pump circuit 100 is used in the air pump device 10 of the present utility model, the embodiments of the air pump device 10 of the present utility model include all the technical solutions of all the embodiments of the air pump circuit 100, and the achieved technical effects are identical, and are not described herein again.
The utility model also provides a laser engraving machine, which comprises the air pump device 10. The air pump device 10 may be an electromagnetic air pump 2000.
The detailed structure of the air pump 2000 can refer to the above embodiments, and will not be described herein; it can be understood that, since the air pump device 10 is used in the laser engraving machine of the present utility model, the embodiments of the laser engraving machine of the present utility model include all the technical solutions of all the embodiments of the air pump device 10, and the achieved technical effects are identical, and are not described in detail herein.
Hereinabove, the specific embodiments of the present utility model are described with reference to the accompanying drawings. However, those of ordinary skill in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the utility model without departing from the spirit and scope thereof. Such modifications and substitutions are intended to be included within the scope of the present utility model.
Claims (10)
1. An air pump circuit for controlling the work of an air pump is characterized by comprising a main control circuit, a driving circuit, a detection circuit and a direct current power supply;
the control signal is output from the main control circuit to the driving circuit, and the driving circuit forms a periodic driving signal and outputs the periodic driving signal so as to drive the air pump to work;
a detection signal is output from the detection circuit to a driving circuit, the driving circuit is configured to acquire the working current of the air pump according to the detection signal, and when the working current is larger than a current threshold value, the driving circuit adjusts the driving signal output in the current period;
the direct current power supply is used for providing direct current for the air pump circuit.
2. The air pump circuit of claim 1, wherein the detection circuit is a current detection circuit comprising a detection resistor electrically connected to the air pump;
the detection circuit is used for outputting a detection signal according to the detection resistor.
3. The air pump circuit of claim 2, further comprising:
a reference voltage input circuit for inputting a reference voltage;
the driving circuit is electrically connected with the reference voltage input circuit to acquire the reference voltage; the drive circuit determines the current threshold based on the reference voltage and the sense resistor.
4. An air pump circuit as claimed in claim 3, wherein the reference voltage input circuit comprises:
one end of the first resistor is used for being connected with a power supply voltage, and the other end of the first resistor is electrically connected with the driving circuit;
and the first end of the variable resistor is electrically connected with the other end of the first resistor, and the second end of the variable resistor is grounded.
5. The air pump circuit of claim 1, wherein the master circuit is configured to output the control signal having different frequencies and duty cycles according to different settings.
6. The air pump circuit of claim 1, further comprising an output interface; the output interface is used for being electrically connected with the air pump.
7. The air pump circuit of claim 6, further comprising a filter circuit;
the filter circuit comprises a first filter circuit, wherein the input end of the first filter circuit is used for being connected with the direct current power supply, and the output end of the first filter circuit is electrically connected with the power supply end of the driving circuit; the first filter circuit is used for filtering the direct-current power supply;
and/or the filter circuit comprises a second filter circuit, wherein the input end of the second filter circuit is electrically connected with the output end of the driving circuit, and the output end of the second filter circuit is electrically connected with the output interface; the second filter circuit is used for filtering the driving signal.
8. The air pump circuit of claim 7, further comprising:
the input end of the interface protection circuit is electrically connected with the output end of the driving circuit, and the output end of the interface protection circuit is electrically connected with the output interface;
the interface protection circuit comprises a first diode and a first capacitor; the negative electrode of the first diode is electrically connected with the first end of the first capacitor to form the input end of the interface protection circuit, and the positive electrode of the first diode is electrically connected with the second end of the first capacitor to form the output end of the interface protection circuit.
9. An air pump apparatus, characterized in that the air pump apparatus comprises:
an air pump;
an air pump circuit according to any one of claims 1 to 8, electrically connected to the air pump;
the air pump circuit is used for periodically outputting a driving signal to drive the air pump to work;
the air pump circuit is also used for detecting the working current of the air pump and stopping outputting a driving signal in the current period when the working current value is larger than the current threshold value.
10. A laser engraving machine, characterized in that it comprises an air pump device according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320868224.9U CN219672823U (en) | 2023-04-11 | 2023-04-11 | Air pump circuit, air pump device and laser engraving machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320868224.9U CN219672823U (en) | 2023-04-11 | 2023-04-11 | Air pump circuit, air pump device and laser engraving machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219672823U true CN219672823U (en) | 2023-09-12 |
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ID=87920103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320868224.9U Active CN219672823U (en) | 2023-04-11 | 2023-04-11 | Air pump circuit, air pump device and laser engraving machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219672823U (en) |
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2023
- 2023-04-11 CN CN202320868224.9U patent/CN219672823U/en active Active
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