A spray arm speed testing system and method for dishwasher

Abstract

The invention discloses a spray arm speed test system for a dishwasher and a test method thereof. The spray arm speed test system comprises a speed acquisition and transmission module, which is used for acquiring speed data of the spray arm of the dishwasher; a data receiving module, which is used for receiving the speed data of the spray arm transmitted by the speed acquisition and transmission module to a server; a data concentration programmable controller, which unifies the spray arm speed data received by the data concentration programmable controller and performs classification processing through a communication address; an industrial computer, which sorts the spray arm speed data, analyzes and gives a judgment result according to a preset judgment value, stores a unique product serial number in a single MES data file, and counts the qualified rate of a production line to finally generate a report. The invention can accurately measure the speed data of the spray arm in a closed high-temperature environment and under complex working conditions with splashing water.

Description

Technical Field

[0001] The invention relates to the technical field of speed testing of a spray arm of a dishwasher, in particular to a spray arm speed testing system and a testing method of the spray arm of a dishwasher. Background Art

[0002] As people's living standards gradually improve and the pace of life continues to accelerate, more and more families have chosen to buy dishwashers. With the development of the electrification of housework and the gradual increase in the living area of ​​urban families, my country's dishwasher market has great development potential. According to surveys, there are 160 million urban households in my country. Even if only 1% of households buy dishwashers each year, the annual market demand is more than one million units. According to relevant surveys of the top ten cities including Beijing, Shanghai, Guangzhou, Shenzhen, Nanjing, and Hangzhou, the national dishwasher market capacity is about 7 million units. Research and analysis by the China Light Industry Information Center shows that dishwashers may become the fastest growing product among my country's household appliances in recent years.

[0003] Most dishwashers use a universal spray type. Driven by a washing pump, the spray arm mixes hot water and detergent to rotate at high speed, and at the same time sprays out a high-temperature and high-pressure water column to directly flush the surface of the tableware. Some detergent is sprayed onto the tableware and the inner wall and then rebounds, and the tableware is rinsed twice. After the spray, the refluxed detergent flushes the surface of the tableware. The final washing effect is related to the pressure of the jet water sprayed from the spray arm, the spray angle and the rotation speed. At present, the speed inspection of the spray arm of the dishwasher mainly relies on the sampling method. By opening the door or making a transparent special water retaining door for inspection after opening the door, the inspector relies on visual inspection after starting the dishwasher, and the speed of the spray arm is realized by counting the spray arm operation process. This detection method has inaccurate data, low work efficiency and high labor cost. In addition, in a humid, water-spraying and hot water-filled enclosed space, it is difficult to measure the speed of the internal components of the dishwasher or other internal variable parameters without destroying the sealing and structure of the product itself. Summary of the invention

[0004] The object of the present invention is to provide a spray arm rotation speed test system and a test method for a dishwasher, which can accurately measure the rotation speed data of the spray arm in a closed high-temperature environment and under complex working conditions with splashing water.

[0005] The present invention is achieved through the following technical solutions:

[0006] A spray arm speed testing system for a dishwasher, comprising:

[0007] The speed collection and transmission module is used to collect the speed data of the spray arm of the dishwasher, and pre-process and calculate the speed data of the spray arm before sending it to the server;

[0008] A data receiving module, the data receiving module is used to receive the speed data of the spray arm transmitted by the speed acquisition and transmission module to the server;

[0009] A data collection programmable controller is connected to the data receiving module via an RS485 communication port, and the spray arm speed data received by the data receiving module are unified into the data collection programmable controller for classification processing via the communication address;

[0010] The industrial computer is connected to the programmable controller in the data collection center through the RS232 communication port; the programmable controller in the data collection center transmits the classified spray arm speed data to the industrial computer through the communication address, the industrial computer sorts the spray arm speed data, analyzes and gives the judgment result according to the preset judgment value, stores the unique product serial number in the MES data single file, counts the production line qualification rate, and finally generates a report.

[0011] Furthermore, the speed collection and transmission module includes:

[0012] Lithium battery pack, which is used to provide power;

[0013] A power management circuit, which is electrically connected to the lithium battery pack and performs voltage reduction and voltage stabilization processing and power monitoring on the lithium battery pack;

[0014] A start-stop sensing circuit, which is used to control the start and stop of the speed acquisition and transmission module;

[0015] Laser speed measurement module: The laser speed measurement module measures the speed data of the spray arm in a closed high-temperature environment and under complex working conditions with splashing water;

[0016] LoRa transmitting and receiving module, the LoRa transmitting and receiving module transmits data from the terminal node to the server based on the LoRa narrowband wireless technology 915M operating frequency, and the LoRa transmitting and receiving module sends the rotation speed data of the spray arm measured by the laser speed measurement module to the data receiving module; and

[0017] The ARM-STM32 processor adopts the STM32F103C chip; the ARM-STM32 processor is electrically connected to the power management circuit, the LoRa sending and receiving module, the start-stop sensing circuit and the laser speed measurement module respectively.

[0018] Furthermore, the data receiving module includes:

[0019] A power management circuit, which performs voltage reduction and voltage stabilization processing on the power supply;

[0020] A LoRa transmitting and receiving module, the LoRa transmitting and receiving module is used to receive the rotation speed data of the spray arm measured by the laser speed measurement module;

[0021] An RS485 communication module, the RS485 communication module is used for data transmission, transmitting the rotation speed data of the spray arm received by the LoRa transmitting and receiving module to a data set centralized programmable controller; and an ARM-STM32 processor, the ARM-STM32 processor is electrically connected to the power management circuit, the LoRa transmitting and receiving module and the RS485 communication module respectively.

[0022] Furthermore, the data collection programmable controller is connected to a touch screen via a LAN communication port; the data collection programmable controller is connected to a barcode scanner via an RS232 communication interface; the data collection programmable controller is connected to the industrial computer via an RS232 communication interface.

[0023] Furthermore, the industrial computer is electrically connected to a display screen.

[0024] Furthermore, the laser speed measuring module includes a fixed plate, an upper speed measuring arm, a lower speed measuring arm, a strong magnet and a control box; the upper speed measuring arm is fixedly installed on the upper end of the fixed plate; the lower speed measuring arm is fixedly installed on the lower end of the fixed plate; the control box is installed in the middle of the fixed plate; the strong magnet is installed at the lower part of the fixed plate and is located above the lower speed measuring arm.

[0025] Furthermore, the upper speed measuring arm and the lower speed measuring arm are both provided with a U-shaped opening at one end away from the fixed plate; the opening of the U-shaped opening is away from the fixed plate, and speed measuring arm sensors are respectively installed at both ends of the U-shaped opening.

[0026] Furthermore, the start-stop sensing circuit includes a start sensing switch, an optical fiber switch and a module circuit board; the start sensing switch is arranged on the fixed plate and located inside the control box; the optical fiber switch is installed on the upper end surface of the speed measuring arm sensor; the module circuit board is arranged inside the control box; the module circuit board is electrically connected to the start sensing switch and the optical fiber switch respectively.

[0027] Furthermore, a method for testing the speed of a spray arm of a dishwasher comprises the following steps:

[0028] Step (1), during the test, the operator uses a barcode scanner to first scan the barcode on the dishwasher at the test station, and then scans the barcode on the speed acquisition and transmission module, and the industrial computer matches the corresponding relationship between the dishwasher and the speed acquisition and transmission module, and at the same time matches the standard speed of the dishwasher spray arm;

[0029] Step (2), setting the upper and lower speed limits through the touch screen, and when the preset speed is exceeded, an audible and visual alarm prompts, and a corresponding test station graphic flashes on the display screen;

[0030] Step (3), the operator attaches the speed collection and transmission module to the inner wall of the dishwasher through a strong magnet and starts the dishwasher;

[0031] Step (4), the speed collection and transmission module collects the speed data of the spray arm of the dishwasher, and sends the speed data of the spray arm to the data receiving module after preprocessing and calculation; the data collection programmable controller is connected to the data receiving module through the RS485 communication port, and the spray arm speed data received by the data receiving module is unified into the data collection programmable controller for classification processing through the communication address; the industrial computer is connected to the data collection programmable controller through the RS232 communication port; the data collection programmable controller transmits the spray arm speed data after classification processing to the industrial computer through the communication address;

[0032] In step (5), the industrial computer sorts the spray arm speed data, analyzes and gives a judgment result according to the preset judgment value, stores the unique product serial number in a single MES data file, uploads it to the MES system through the communication protocol, calculates the production line qualification rate, and finally generates a report; the real-time speed and maximum speed of the spray arm at each test station are displayed on the display screen.

[0033] Furthermore, in the step (3), the speed collection and transmission module is adjusted to be adsorbed on the inner wall of the dishwasher so that the middle spray arm of the dishwasher is located between the U-shaped openings of the upper speed measuring arm, and the lower spray arm of the dishwasher is located between the U-shaped openings of the lower speed measuring arm; in the step (4), the speed data of the middle spray arm and the lower spray arm of the dishwasher are collected by speed measuring arm sensors respectively arranged on the upper speed measuring arm and the lower speed measuring arm, and the collected speed data are pre-processed by the ARM-STM32 processor and then sent to the data receiving module.

[0034] Beneficial effects of the present invention:

[0035] The present invention sets a speed collection and transmission module, a data receiving module, a data collection programmable controller and an industrial computer; the speed collection and transmission module is used to collect the speed data of the spray arm of the dishwasher, and sends the speed data of the spray arm to the server after pre-processing and calculation, and the data receiving module is used to receive the speed data of the spray arm transmitted by the speed collection and transmission module to the server; the data collection programmable controller is connected with the data receiving module through an RS485 communication port, and the spray arm speed data received by the data receiving module are unified into the data collection programmable controller for classification processing through the communication address; the industrial computer is connected with the data collection programmable controller through an RS232 communication port; the data collection programmable controller transmits the spray arm speed data after classification processing to the industrial computer through the communication address, the industrial computer sorts the spray arm speed data, analyzes and gives the judgment result according to the preset judgment value, stores the unique product serial number in the MES data single file, counts the qualified rate of the production line, and finally generates a report. The present invention can accurately measure the rotation speed data or other internal change parameters of the spray arm in a closed high-temperature environment and under complex working conditions with splashing water, without destroying the sealing and structure of the product itself, thereby realizing automatic detection of the rotation speed of the spray arm, improving product quality, reducing manual detection, and realizing fool-proof and error-proofing functions through automatic detection, thereby improving work efficiency and reducing labor costs, and at the same time having a wide range of uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the measurement and control framework of the spray arm speed test system according to an embodiment of the present invention;

[0037] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0038] Figure 3 for Figure 1 A magnified schematic diagram of part B;

[0039] Figure 4 for Figure 1 An enlarged schematic diagram of the C portion;

[0040] Figure 5 This is a schematic diagram of assembling a rotation speed acquisition and transmission module and a dishwasher according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the structure of a rotation speed acquisition and transmission module according to an embodiment of the present invention;

[0042] Figure 7 A circuit diagram of an ARM-STM32 processor according to an embodiment of the present invention;

[0043] Figure 8 This is a circuit diagram of a LoRa transmitting and receiving module according to an embodiment of the present invention;

[0044] Fig. 9 is a circuit diagram of a power management circuit according to an embodiment of the present invention;

[0045] Fig.10 A circuit diagram of a communication address according to an embodiment of the present invention;

[0046] Fig.11 A circuit diagram of an RS485 communication module according to an embodiment of the present invention;

[0047] Fig.12 A circuit diagram of a low-battery buzzer alarm according to an embodiment of the present invention;

[0048] Fig.13 The circuit diagram of the power collection according to the embodiment of the present invention.

[0049] In the attached figure: 1-lithium battery pack; 2-LoRa transmitting and receiving module; 3-fixed plate; 4-upper speed measuring arm; 5-lower speed measuring arm; 6-strong magnet; 7-control box; 8-speed measuring arm sensor; 9-dishwasher; 10-middle spray arm; 11-lower spray arm; 12-start induction switch; 13-optical fiber switch; 14-module circuit board. DETAILED DESCRIPTION

[0050] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0051] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, top, end, bottom...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0052] In the present invention, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] like Figures 1 to 4 and Fig.10 As shown, a spray arm speed test system for a dishwasher comprises: a speed acquisition and transmission module, the speed acquisition and transmission module is used to collect the speed data of the spray arm of the dishwasher, and pre-process and calculate the speed data of the spray arm and then send it to a server;

[0055] A data receiving module, the data receiving module is used to receive the speed data of the spray arm transmitted by the speed acquisition and transmission module to the server;

[0056] A data collection programmable controller is connected to the data receiving module via an RS485 communication port, and the spray arm speed data received by the data receiving module are unified into the data collection programmable controller for classification processing via the communication address;

[0057] The industrial computer is connected to the programmable controller in the data collection center through the RS232 communication port; the programmable controller in the data collection center transmits the classified spray arm speed data to the industrial computer through the communication address, the industrial computer sorts the spray arm speed data, analyzes and gives the judgment result according to the preset judgment value, stores the unique product serial number in the MES data single file, counts the production line qualification rate, and finally generates a report.

[0058] Reference Figures 6 to 9 ,as well as Fig.12 and Fig.13 Specifically, in this embodiment, the speed acquisition and transmission module includes:

[0059] Lithium battery pack 1 is used to provide power. It should be noted that the lithium battery pack 1 adopts an independent module design. The lithium battery pack 1 can be disassembled and directly charged externally, similar to a mobile phone power bank. The spray arm speed test system reads the power of the dedicated power module. When the voltage is lower than the operating voltage, the spray arm speed test system reminds the operator to charge the lithium battery pack 1.

[0060] The power management circuit is electrically connected to the lithium battery pack 1 to perform voltage reduction and voltage stabilization and power monitoring on the lithium battery pack 1. It should be noted that when the power is lower than 10.6V, the power management circuit will sound a low-battery buzzer alarm to remind the operator to charge.

[0061] A start-stop sensing circuit, which is used to control the start and stop of the speed acquisition and transmission module;

[0062] Laser speed measurement module: The laser speed measurement module measures the speed data of the spray arm in a closed high-temperature environment and under complex working conditions with splashing water;

[0063] LoRa sending and receiving module 2, LoRa sending and receiving module 2 is based on the LoRa narrowband wireless technology 915M working frequency for data transmission from the terminal node to the server, and the LoRa sending and receiving module 2 sends the speed data of the spray arm measured by the laser speed measurement module to the data receiving module; and ARM-STM32 processor, the ARM-STM32 processor uses the chip STM32F103C chip; the 32-bit low-power STM32F103C chip of ST company is used to ensure reliable and stable operation, and to ensure long-term endurance, which fully meets the testing requirements of the production line; the ARM-STM32 processor is electrically connected to the power management circuit, the LoRa sending and receiving module, the start-stop sensing circuit and the laser speed measurement module respectively. It should be noted that the power supply circuit of the laser speed measurement module and the circuit board of the ARM-STM32 processor are sealed with glue, and the cover plate is sealed with a sealing ring, which has good waterproof performance.

[0064] Reference Fig.11 Specifically, in this embodiment, the data receiving module includes:

[0065] A power management circuit, which performs voltage reduction and voltage stabilization processing on the power supply;

[0066] A LoRa transmitting and receiving module, the LoRa transmitting and receiving module is used to receive the rotation speed data of the spray arm measured by the laser speed measurement module;

[0067] An RS485 communication module, the RS485 communication module is used for data transmission, transmitting the rotation speed data of the spray arm received by the LoRa transmitting and receiving module to a data set centralized programmable controller; and an ARM-STM32 processor, the ARM-STM32 processor is electrically connected to the power management circuit, the LoRa transmitting and receiving module and the RS485 communication module respectively.

[0068] Specifically, in this embodiment, the data collection programmable controller is connected to a touch screen via a LAN communication port; the data collection programmable controller is connected to a barcode scanner via an RS232 communication interface; the data collection programmable controller is connected to the industrial computer via an RS232 communication interface. It should be noted that the touch screen is used to set the upper and lower speed limits, and an audible and visual alarm will sound when the preset speed is exceeded; the barcode scanner is used to scan the barcode on the dishwasher and the barcode on the speed acquisition and transmission module, and then the industrial computer matches the corresponding relationship between the dishwasher and the speed acquisition and transmission module, and matches the standard speed of the dishwasher spray arm;

[0069] Specifically, in this embodiment, the industrial control machine is electrically connected to a display screen. It should be noted that the display screen can display the communication, online and power status information of all modules, as well as the real-time speed and maximum speed of the spray arm at each test station, and monitor the speed of the spray arm of the dishwasher in real time.

[0070] Reference Figure 5 and Figure 6 Specifically, in this embodiment, the laser speed measuring module includes a fixed plate 3, an upper speed measuring arm 4, a lower speed measuring arm 5, a strong magnet 6 and a control box 7; the upper speed measuring arm 4 is fixedly installed on the upper end of the fixed plate 3; the lower speed measuring arm 5 is fixedly installed on the lower end of the fixed plate 3; the control box 7 is installed in the middle of the fixed plate 3; the strong magnet 6 is installed at the lower part of the fixed plate 3 and is located above the lower speed measuring arm 5.

[0071] Specifically, in the present embodiment, the upper speed measuring arm 4 and the lower speed measuring arm 5 are both provided with a U-shaped opening at one end away from the fixed plate 3; the opening of the U-shaped opening is away from the fixed plate 3, and the speed measuring arm sensors 8 are respectively installed at both ends of the U-shaped opening. It should be noted that the laser speed measuring module is adsorbed on the inner wall of the dishwasher 9 by a strong magnet 6, so that the middle spray arm 10 of the dishwasher 9 is located between the U-shaped openings of the upper speed measuring arm 4, and the lower spray arm 11 of the dishwasher 9 is located between the U-shaped openings of the lower speed measuring arm 5. When the middle spray arm 10 and the lower spray arm 11 of the dishwasher 9 rotate, the speed measuring arm sensor 8 detects and collects the rotation speeds of the middle spray arm 10 and the lower spray arm 11 of the dishwasher 9.

[0072] Specifically, in the present embodiment, the start-stop sensing circuit includes a start sensing switch 12, an optical fiber switch 13 and a module circuit board 14; the start sensing switch 12 is arranged on the fixed plate 3 and is located inside the control box 7; the optical fiber switch 13 is installed on the upper end surface of the speed measuring arm sensor 8; the module circuit board 14 is arranged inside the control box 7; the module circuit board 14 is electrically connected to the start sensing switch 12 and the optical fiber switch 13 respectively. It should be noted that the start sensing switch 12 is used to automatically sense the rotation of the spray arm of the dishwasher 9, connect the power supply of the speed collection and transmission module, and perform normal work; the optical fiber switch 13 has a long service life, is safe and reliable, and has strong anti-interference, and is particularly suitable for applications such as humidity, high temperature, and strong electromagnetic interference. The optical fiber switch 13 can work even when completely immersed in liquid, so as to realize the normal operation of the start-stop sensing circuit.

[0073] Specifically, in this embodiment, a method for testing the rotation speed of a spray arm of a dishwasher includes the following steps:

[0074] Step (1), during the test, the operator uses a barcode scanner to first scan the barcode on the dishwasher 9 at the test station, and then scans the barcode on the speed acquisition and transmission module, and the industrial computer matches the corresponding relationship between the dishwasher 9 and the speed acquisition and transmission module, and at the same time matches the standard speed of the spray arm of the dishwasher 9;

[0075] Step (2) setting the upper and lower speed limits through the touch screen, and when the preset speed is exceeded, an audible and visual alarm is given, and a corresponding test station graphic flashes on the display screen;

[0076] Step (3), the operator attaches the speed acquisition and transmission module to the inner wall of the dishwasher 9 through the strong magnet 6, and starts the dishwasher 9;

[0077] Step (4), the speed collection and transmission module collects the speed data of the spray arm of the dishwasher 9, and sends the speed data of the spray arm to the data receiving module after preprocessing and calculation; the data collection programmable controller is connected to the data receiving module through the RS485 communication port, and the spray arm speed data received by the data receiving module is unified into the data collection programmable controller for classification processing through the communication address; the industrial computer is connected to the data collection programmable controller through the RS232 communication port; the data collection programmable controller transmits the spray arm speed data after classification processing to the industrial computer through the communication address;

[0078] In step (5), the industrial computer sorts the spray arm speed data, analyzes and gives a judgment result according to the preset judgment value, stores the unique product serial number in a single MES data file, uploads it to the MES system through the communication protocol, calculates the production line qualification rate, and finally generates a report; the real-time speed and maximum speed of the spray arm at each test station are displayed on the display screen.

[0079] Specifically, in the present embodiment, in the step (3), the speed acquisition and transmission module is adjusted to be adsorbed on the inner wall of the dishwasher 9 so that the middle spray arm 10 of the dishwasher 9 is located between the U-shaped openings of the upper speed measuring arm 4, and the lower spray arm 11 of the dishwasher 9 is located between the U-shaped openings of the lower speed measuring arm 5; in the step (4), the speed data of the middle spray arm 10 and the lower spray arm 11 of the dishwasher 9 are collected by the speed measuring arm sensors 8 respectively provided on the upper speed measuring arm 4 and the lower speed measuring arm 5, and the collected speed data is pre-processed by the ARM-STM32 processor and then sent to the data receiving module.

[0080] The present invention sets a speed collection and transmission module, a data receiving module, a data collection programmable controller and an industrial computer; the speed collection and transmission module is used to collect the speed data of the spray arm of the dishwasher, and sends the speed data of the spray arm to the server after pre-processing and calculation, and the data receiving module is used to receive the speed data of the spray arm transmitted by the speed collection and transmission module to the server; the data collection programmable controller is connected with the data receiving module through an RS485 communication port, and the spray arm speed data received by the data receiving module are unified into the data collection programmable controller for classification processing through the communication address; the industrial computer is connected with the data collection programmable controller through an RS232 communication port; the data collection programmable controller transmits the spray arm speed data after classification processing to the industrial computer through the communication address, the industrial computer sorts the spray arm speed data, analyzes and gives the judgment result according to the preset judgment value, stores the unique product serial number in the MES data single file, counts the qualified rate of the production line, and finally generates a report. The present invention can accurately measure the rotation speed data or other internal change parameters of the spray arm in a closed high-temperature environment and under complex working conditions with splashing water, without destroying the sealing and structure of the product itself, thereby realizing automatic detection of the rotation speed of the spray arm, improving product quality, reducing manual detection, and realizing fool-proof and error-proofing functions through automatic detection, thereby improving work efficiency and reducing labor costs, and at the same time having a wide range of uses.

[0081] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A spray arm speed test system for a dishwasher, characterized in that: include The speed collection and transmission module is used to collect the speed data of the spray arm of the dishwasher, and pre-process and calculate the speed data of the spray arm before sending it to the server; A data receiving module, the data receiving module is used to receive the speed data of the spray arm transmitted by the speed acquisition and transmission module to the server; A data collection programmable controller is connected to the data receiving module via an RS485 communication port, and the spray arm speed data received by the data receiving module are unified into the data collection programmable controller for classification processing via the communication address; The industrial computer is connected to the programmable controller in the data collection center through the RS232 communication port; the programmable controller in the data collection center transmits the classified spray arm speed data to the industrial computer through the communication address; the industrial computer sorts the spray arm speed data, analyzes and gives the judgment result according to the preset judgment value, stores the unique product serial number in the MES data single file, counts the qualified rate of the production line, and finally generates a report; The speed acquisition and transmission module includes Lithium battery pack, which is used to provide power; A power management circuit, which is electrically connected to the lithium battery pack and performs voltage reduction and voltage stabilization processing and power monitoring on the lithium battery pack; A start-stop sensing circuit, which is used to control the start and stop of the speed acquisition and transmission module; Laser speed measurement module: The laser speed measurement module measures the speed data of the spray arm in a closed high-temperature environment and under complex working conditions with splashing water; LoRa sending and receiving module, the LoRa sending and receiving module is based on the LoRa narrowband wireless technology 915M working frequency for data transmission from the terminal node to the server, and the LoRa sending and receiving module sends the speed data of the spray arm measured by the laser speed measurement module to the data receiving module; as well as ARM-STM32 processor, the ARM-STM32 processor adopts the chip STM32F103C chip; the ARM-STM32 processor is electrically connected to the power management circuit, the LoRa sending and receiving module, the start-stop sensing circuit and the laser speed measurement module respectively; The data receiving module includes A power management circuit, which performs voltage reduction and voltage stabilization processing on the power supply; A LoRa transmitting and receiving module, the LoRa transmitting and receiving module is used to receive the rotation speed data of the spray arm measured by the laser speed measurement module; RS485 communication module, the RS485 communication module is used for data transmission, transmitting the rotation speed data of the spray arm received by the LoRa transmitting and receiving module to the data collection programmable controller; and An ARM-STM32 processor, the ARM-STM32 processor is electrically connected to the power management circuit, the LoRa transmitting and receiving module, and the RS485 communication module respectively; The laser speed measuring module comprises a fixed plate, an upper speed measuring arm, a lower speed measuring arm, a strong magnet and a control box; the upper speed measuring arm is fixedly mounted on the upper end of the fixed plate; the lower speed measuring arm is fixedly mounted on the lower end of the fixed plate; the control box is mounted on the middle of the fixed plate; the strong magnet is mounted on the lower part of the fixed plate and is located above the lower speed measuring arm; The upper speed measuring arm and the lower speed measuring arm are both provided with a U-shaped opening at one end away from the fixing plate; the opening of the U-shaped opening is away from the fixing plate, and speed measuring arm sensors are respectively installed at both ends of the U-shaped opening.

2. The spray arm speed test system of a dishwasher according to claim 1, characterized in that: The data collection programmable controller is connected to a touch screen via a LAN communication port; the data collection programmable controller is connected to a barcode scanner via an RS232 communication interface; and the data collection programmable controller is connected to the industrial computer via an RS232 communication interface.

3. A dishwasher spray arm speed test system according to claim 2, characterized in that: The industrial control machine is electrically connected to a display screen.

4. The spray arm speed test system for a dishwasher according to claim 1, characterized in that: The start-stop sensing circuit includes a start sensing switch, an optical fiber switch and a module circuit board; the start sensing switch is arranged on the fixing plate and located inside the control box; the optical fiber switch is installed on the upper end surface of the speed measuring arm sensor; The module circuit board is arranged inside the control box; the module circuit board is electrically connected to the start sensing switch and the optical fiber switch respectively.

5. The method for testing a spray arm speed test system of a dishwasher according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step (1), during the test, the operator at the test station uses a barcode scanner to first scan the barcode on the dishwasher, and then scans the barcode on the speed acquisition and transmission module, and the industrial computer matches the corresponding relationship between the dishwasher and the speed acquisition and transmission module, and at the same time matches the standard speed of the dishwasher spray arm; Step (2), setting the upper and lower speed limits through the touch screen. When the speed exceeds the preset limit, an audible and visual alarm will sound, and a corresponding test station graphic will flash on the display screen; Step (3), the operator attaches the speed acquisition and transmission module to the inner wall of the dishwasher via a strong magnet, and starts the dishwasher; Step (4), the speed acquisition and transmission module acquires the speed data of the spray arm of the dishwasher, and pre-processes and calculates the speed data of the spray arm and then sends it to the data receiving module; The data collection programmable controller is connected to the data receiving module through the RS485 communication port, and the spray arm speed data received by the data receiving module is unified into the data collection programmable controller for classification processing through the communication address; the industrial computer is connected to the data collection programmable controller through the RS232 communication port; the data collection programmable controller transmits the classified spray arm speed data to the industrial computer through the communication address; Step (5), the industrial computer sorts the spray arm speed data, analyzes and gives the judgment result according to the preset judgment value, stores the unique product serial number in the MES data single file, uploads it to the MES system through the communication protocol, calculates the production line qualification rate, and finally generates a report; The real-time rotation speed and the maximum rotation speed of the spray arm at each test station are displayed through the display screen.

6. The testing method according to claim 5, characterized in that: In the step (3), the speed acquisition and transmission module is adjusted to be adsorbed on the inner wall of the dishwasher so that the middle spray arm of the dishwasher is located between the U-shaped openings of the upper speed measuring arm, and the lower spray arm of the dishwasher is located between the U-shaped openings of the lower speed measuring arm. In the step (4), the speed data of the middle spray arm and the lower spray arm of the dishwasher are collected by speed measuring arm sensors respectively provided on the upper speed measuring arm and the lower speed measuring arm, and the collected speed data is pre-processed by the ARM-STM32 processor and then sent to the data receiving module.

Images