CN216950942U

CN216950942U - Automatic fan testing system and device

Info

Publication number: CN216950942U
Application number: CN202220146352.8U
Authority: CN
Inventors: 冯明春; 赖福建; 谢卿; 袁超
Original assignee: Jiangxi Sanjing Electric Co ltd
Current assignee: Jiangxi Sanjing Electric Co ltd
Priority date: 2022-01-19
Filing date: 2022-01-19
Publication date: 2022-07-12
Anticipated expiration: 2032-01-19

Abstract

The utility model discloses an automatic fan testing system and device, wherein the system comprises a wind speed sensing module, a signal amplification module, a signal conversion module and a processor module; the wind speed sensing module is connected to one end of the signal amplification module, the other end of the signal amplification module is connected to one end of the signal conversion module, the other end of the signal conversion module is connected to one end of the processor module, and the other end of the processor module is connected to an upper computer; according to the scheme, wind speed information can be acquired through the wind speed sensing module, corresponding electric signals are output to the signal amplification module and then output to the signal conversion module, the signals are input to the upper computer after amplification, compensation and digitization, the measurement precision can be improved, the data post-processing process is automatically completed, the speed measurement function is enlarged, the automatic test function is achieved, and the automatic test device can be widely applied to the technical field of electronic product test equipment.

Description

Automatic fan testing system and device

Technical Field

The utility model relates to the technical field of electronic product testing equipment, in particular to an automatic fan testing system and device.

Background

In the related art, in the production process of electronic products, an indispensable link is a product testing link, and for the testing process of electronic products, various electronic product production testing devices also exist, and with the increasingly wide application of frequency converters, the product quality requirement is higher, and in the related art, for example, in the production testing process of household electric fans, a manual detection mode is still adopted under normal conditions: need detect the workman promptly with the hand place the position with the fan, go to the experience through the hand and wait that the fan that detects is normal air-out, then whether the mode input fan of rethread manual input is the testing result of yields, and at the in-process of manual detection, it probably has the condition such as manual detection error and subjective judgement mistake and leads to final testing result rate of accuracy low to, the process of manual detection is loaded down with trivial details, inefficiency and need drop into considerable human resource cost.

SUMMERY OF THE UTILITY MODEL

To solve one of the above technical problems, the present invention aims to: the automatic fan testing system is simpler and more convenient to operate and higher in detection accuracy, and the device with the system built in is provided.

The technical scheme adopted by the utility model is as follows: the system comprises a wind speed sensing module, a signal amplification module, a signal conversion module and a processor module;

the wind speed sensing module is connected to one end of the signal amplification module, the other end of the signal amplification module is connected to one end of the signal conversion module, the other end of the signal conversion module is connected to one end of the processor module, and the other end of the processor module is connected to an upper computer.

In some optional embodiments, the signal amplifying module includes a signal amplifying circuit and a first transmission circuit, an input end of the signal amplifying circuit is connected to an output end of the wind speed sensing module, an output end of the signal amplifying circuit is connected to one end of the first transmission circuit, and another end of the first transmission circuit is connected to the signal converting module.

In some optional embodiments, the signal conversion module comprises a current-to-voltage converter, an analog-to-digital conversion circuit, and a second transmission circuit;

the input end of the current-voltage converter is connected to the signal amplification module, the output end of the current-voltage converter is connected to the input end of the analog-to-digital conversion circuit, the output end of the analog-to-digital conversion circuit is connected to one end of the second transmission circuit, and the other end of the second transmission circuit is connected to the processor module.

In some alternative embodiments, the upper computer is connected to the processor module through a first RS-232 serial interface.

In some optional embodiments, the processor module includes a single chip processor, one end of the single chip processor is connected to the signal conversion module, and the other end of the single chip processor is in communication connection with the upper computer.

In some optional embodiments, the system further comprises an alarm module coupled to the processor module.

In some optional embodiments, the system further comprises a power supply module connected to the signal amplification module; the power supply module is connected with the signal conversion module; the power supply module is also connected with the processor module.

On the other hand, the technical scheme of this application still provides a fan automatic testing arrangement, and the device includes arbitrary fan automatic testing system in the first aspect.

The utility model has the beneficial effects that: the system of the technical scheme mainly comprises a wind speed sensing module, a signal amplification module, a signal conversion module and a processor module; in the production process, the wind speed sensing module is used for collecting wind speed information, outputting a corresponding electric signal to the signal amplification module and then outputting the electric signal to the signal conversion module, and the electric signal is amplified, compensated and digitized and then input into the upper computer, so that the measurement precision can be improved, the data post-processing process can be automatically completed, the speed measurement function is expanded, and the function of automatic test is achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a block diagram of an automatic fan testing system according to an embodiment of the present invention;

FIG. 2 is a schematic circuit diagram of a signal amplification circuit in a system according to an embodiment of the present invention;

fig. 3 is a block diagram of an internal structure of the single chip microcomputer in the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length," "upper," "lower," "front," "rear," "left," "right," "top," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

Based on the defects and shortcomings of the related art pointed out in the background art, as shown in fig. 1, the technical solution of the present application provides an automatic fan testing system, which mainly includes a wind speed sensing module, a signal amplification module, a signal conversion module and a processor module. A

The wind speed sensing module is connected to one end of the signal amplification module, the other end of the signal amplification module is connected to one end of the signal conversion module, the other end of the signal conversion module is connected to one end of the processor module, and the other end of the processor module is connected to the upper computer.

In the embodiment, the wind speed sensing module is mainly used for collecting a flow speed signal of the electric fan to be tested during operation, converting the collected flow speed signal into a corresponding analog electric signal, and outputting the converted analog electric signal to the signal amplification module. For example, when the electric fan with the frequency conversion function is detected, when the frequency converter operates, the air flow generated when the fan operates passes through the thin metal wire (also called a hot wire) of the induction head (electric heating mode) of the wind speed induction module, the heat dissipation amount causes the temperature change of the hot wire to cause the resistance change, and the flow speed signal is converted into an electric signal. Because the wind speed sensing module converts and the output analog electrical signal has a small numerical value and the change condition of the flow velocity signal is difficult to obtain from the change of the numerical value, in the embodiment, the analog electrical signal obtained by the wind speed sensing module is output to the signal amplification module, and the analog electrical signal is amplified and compensated through the signal amplification module. The signal conversion module in the embodiment system is used for converting the input analog electric signal into a digital electric signal and inputting the digital electric signal to the subsequent processor module; specifically, the signal conversion module samples the analog signal after receiving the amplified analog electrical signal output by the signal amplification module, and then performs quantization coding on the analog signal to obtain a binary digital signal; and outputs the binary digital signal to the processor module. In the embodiment system, the processor module is mainly used for performing necessary data processing procedures according to a pre-written processing program and digital information output by the signal conversion module to obtain corresponding input level signals, so that the processor module triggers corresponding judgment procedures, finally outputs judgment results and transmits the judgment results to the upper computer through a data communication channel. It should be noted that, in the embodiment, the system may operate or interrupt the detection process according to a corresponding control instruction of the upper computer.

In some alternative embodiments, the signal amplification module in the system may include a signal amplification circuit and a first transmission circuit.

The input end of the signal amplification circuit is connected to the output end of the wind speed sensing module, the output end of the signal amplification circuit is connected to one end of the first transmission circuit, and the other end of the first transmission circuit is connected to the signal conversion module.

In particular, in an embodiment, the signal amplification module may include two functional portions, one of which is a signal amplification circuit; illustratively, as shown in fig. 2, a bipolar single-stage amplifying circuit may be adopted in the embodiment, wherein the core element transistors of the single-stage amplifying circuit operate in an amplifying state, i.e. it is required that its emitter set is forward biased and its collector set is reverse biased. The input loop in the amplifying circuit is arranged to couple the input signal to the input electrode of the transistor and form a variable base current, thereby generating a current control relationship of the transistor and changing the current control relationship into a variable collector current; the arrangement of the output loop should ensure that the current signal amplified by the transistor can be converted into a voltage form required by a subsequent module (signal conversion module). Another functional part of the signal amplification module in the system of the embodiment is a transmission circuit, which can be implemented by corresponding wire connection.

In some alternative embodiments, the signal conversion module in the system includes a current-to-voltage converter, an analog-to-digital conversion circuit, and a second transmission circuit.

In an embodiment, the current-to-voltage converter mainly converts the voltage signal into a current signal satisfying a certain relationship, i.e., V/I conversion, and the converted current is equivalent to a constant current source with adjustable output, and the output current of the constant current source can be kept stable and will not change with the change of the load. The current-voltage converter is used for converting the output voltage of the multiplying and dividing component into direct current; in the embodiment system, the voltage-current converter is composed of two parts of a self-oscillation modulation amplifier and a power detection amplifier. Analog signals in the system can be processed by a processor only after being converted into digital signals through A/D, and therefore the analog signals need to be processed through an A/D converter (ADC); in the embodiment system, an AD7810 chip is adopted, and in a high-speed mode of the AD7810 chip, a start signal CONVST is generally at a high level; a negative pulse is input at the CONVST terminal, the falling edge of which will initiate a transition. When the conversion is finished, the AD7810 will automatically latch the conversion result into the output shift register, and then the data will appear on DOUT sequentially from high to low on the rising edge of each SCLK pulse. In addition to this, the second transmission circuit in the system of the embodiment can be implemented by corresponding wire connections.

In the embodiment, the system can realize full-duplex communication by using 3 to 9 RS-232 buses, and because the RS-232 adopts a serial transmission mode and converts the TTL level of an upper computer or a data display module into the RS-232C level, the transmission distance can be longer, so as to realize remote control.

In some alternative embodiments, the processor module may include a single-chip processor.

One end of the single chip processor is connected with the signal conversion module, and the other end of the single chip processor is in communication connection with the upper computer.

Specifically, in the embodiment, as shown in fig. 3, the single chip processor in the embodiment may adopt an MCS-51 series integrated circuit chip, which adopts a very large scale integrated circuit technology to perform functions such as a central processing unit CPU with data processing capability, a random access memory RAM, a read only memory ROM, various I/O ports, an interrupt system or a timer/counter.

In some alternative embodiments, the automatic test system further includes an alarm module coupled to the processor module.

Specifically, in the embodiment, when the processor module of the system judges and determines that the current electric fan to be detected is unqualified (for example, the air cannot be discharged normally, or the wind speed cannot meet the gear requirement); or circuit components in the circuit of the system are in an abnormal state, the abnormal state can be generated by improper operation of an operator or due to faults of the components, and the processor module can trigger a corresponding alarm signal to the alarm module so that the alarm module gives an alarm in a prompt tone or light prompt mode. It should be noted that, in the embodiment, the alarm mode in which the product is detected to be unqualified and the alarm mode in which the system has an abnormal fault may be differentiated.

In some alternative embodiments, the system further comprises a power module, wherein the power module is connected to the signal amplification module; the power supply module is connected with the signal conversion module; the power supply module is also connected with the processor module. In an embodiment, the power module in the system is mainly used for supplying power to the signal amplification module, the signal conversion module, the processor module and the like in the system.

On the other hand, the embodiment of the application also provides an automatic discharging device for the inverter board, and the automatic testing system for the fan is arranged in the device.

In summary, in addition to the foregoing beneficial effects, the present invention has the following features or advantages compared with the prior art:

1. the technical scheme of the application can effectively monitor whether the fan of the frequency converter runs or not, and reads the data of the anemoscope through the computer to display the test result;

2. according to the technical scheme, for the complete machine test of the frequency converter, as long as the fan does not rotate, the upper computer can automatically judge PASS or FAIL;

3. the technical scheme of the application has high testing efficiency which is improved by more than 5% compared with other testing efficiency;

4. the technical scheme of the application can replace manual operation, reduce human resource cost, and reduce the occurrence of subjective misjudgment condition.

In the description herein, references to the description of "one embodiment," "another embodiment," or "certain embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. An automatic fan testing system is characterized by comprising a wind speed sensing module, a signal amplification module, a signal conversion module and a processor module;

2. The system as claimed in claim 1, wherein the signal amplifying module includes a signal amplifying circuit and a first transmission circuit, an input terminal of the signal amplifying circuit is connected to an output terminal of the wind speed sensing module, an output terminal of the signal amplifying circuit is connected to one end of the first transmission circuit, and another end of the first transmission circuit is connected to the signal converting module.

3. The system of claim 1, wherein the signal conversion module comprises a current-to-voltage converter, an analog-to-digital conversion circuit, and a second transmission circuit;

4. The system according to claim 1, wherein said host computer is connected to said processor module via a first serial interface.

5. The automatic fan test system of claim 1, wherein the processor module comprises a single-chip microcomputer processor, one end of the single-chip microcomputer processor is connected with the signal conversion module, and the other end of the single-chip microcomputer processor is in communication connection with the upper computer.

6. The automatic fan test system of any one of claims 1-5 further comprising an alarm module coupled to the processor module.

7. The automatic fan test system of any one of claims 1-5, further comprising a power module, the power module being connected to the signal amplification module; the power supply module is connected with the signal conversion module; the power supply module is also connected with the processor module.

8. An automatic fan testing device, characterized in that the device comprises an automatic fan testing system according to any one of claims 1-7.