Safety early warning device of automobile shear type lifting machine

Abstract

The utility model discloses a safety pre-warning device for an automobile scissor lift, which adopts a design scheme of a host and a slave, the host and the slave are respectively arranged on lifting platforms on two sides of the automobile scissor lift, the host and the slave have the same structure, and the host comprises a main control circuit board, a 2000mA / h lithium battery, a main switch and a device shell; related maintenance personnel can use the device to monitor the height to the ground of the lifting platforms on the two sides and the inclination angles of the lifting platforms on the two sides in real time when a vehicle is lifted, and when a tiny height difference exists between the height to the ground of the lifting platforms on the two sides or any side of the lifting platforms on the two sides inclines, an audible and visual alarm mode is adopted to remind an operator, so that the maintenance personnel can conveniently and rapidly lift the vehicle. Therefore, safety accidents such as automobile turning and falling caused by deviation of the gravity center of the automobile during nonstandard operation or lifting are avoided.

Description

Technical Field

[0001] This utility model relates to a safety warning device for automobile scissor lifts, belonging to the technical field of automobile testing and maintenance equipment. Background Technology

[0002] With the sustained and rapid development of China's economy and the significant improvement in people's living standards, automobiles have become an indispensable daily means of transportation for many families, and per capita car ownership has shown a steady upward trend. This positive change has greatly stimulated the vitality and potential of the automotive aftermarket and repair service industry, prompting continuous innovation and upgrading in this field to meet the growing consumer demand.

[0003] Scissor lifts are widely used in routine car maintenance and repair, almost becoming standard equipment in repair shops and an indispensable infrastructure for car repair and maintenance. However, due to the structure of scissor lifts, strict adherence to operating procedures is essential when lifting vehicles. Improper operation or a shift in the vehicle's center of gravity during lifting can cause one side of the lift platform to bear excessive weight, while the other side bears a relatively lighter load, resulting in an uneven height between the two platforms. This imbalance can significantly exacerbate the vehicle's tilting, and in extreme cases, may even cause the vehicle to tip over, leading to a serious accident and posing a significant threat to life and property. Summary of the Invention

[0004] This utility model discloses a safety warning device for car scissor lifts. Maintenance personnel can use this device to monitor the height of the two lifting platforms relative to the ground and their tilt angle in real time when lifting a vehicle. If there is a slight height difference between the two lifting platforms or if either platform tilts, an audible and visual alarm will alert the operator, thus preventing accidents such as vehicle rollovers caused by improper operation or a deviation in the vehicle's center of gravity during lifting.

[0005] The technical solution disclosed in this utility model is as follows:

[0006] A safety warning device for a car scissor lift is characterized by adopting a design of one main unit and one slave unit. The main unit and the slave unit are respectively installed on the lifting platforms on both sides of the car scissor lift. The main unit and the slave unit have the same structure, including: a main control circuit board, a 2000mA / h lithium battery, a main switch, and a device housing.

[0007] The main control circuit board includes: a device power conversion circuit, a device function drive circuit, and a device communication circuit.

[0008] The power conversion circuit of the device includes an A1117-3.3 voltage conversion chip ①, capacitor I ②, and capacitor II ③. (e.g.) Figure 1 (As shown)

[0009] The A1117-3.3 voltage conversion chip ① includes three pins: VIN, GND, and VOUT.

[0010] The device's functional drive circuit includes: an MPU6050 module ④, an OLED display screen ⑤, a green LED ⑥, a red LED ⑦, an NPN transistor S8050 ⑧, a buzzer ⑨, an HC-SR04 ultrasonic ranging module ⑩, and an STM32F103c8t6 chip ⑪. (e.g.) Figure 2 (As shown)

[0011] The MPU6050 module ④ contains four pins: VCC, SCL, SDA, and GND.

[0012] The OLED display ⑤ includes four pins: VCC, SCL1, SDA1, and GND.

[0013] The green LED (⑥) and red LED (⑦) each have two pins: a positive pin and a negative pin.

[0014] The NPN transistor S8050⑧ has three pins: collector, base, and emitter.

[0015] The buzzer ⑨ has two pins, a positive one and a negative one.

[0016] The HC-SR04 ultrasonic ranging module ⑩ contains four pins: VCC, TRIG, ECHO, and GND.

[0017] This part of the circuit uses the STM32F103c8t6 chip⑪ as the main control chip, and the OUT3.3V is connected to the STM32F103c8t6 chip⑪ to supply power to it.

[0018] The STM32F103c8t6 chip ⑪ is connected to the SCL and SDA pins of the MPU6050 module ④ via pins PB10 and PB11 in sequence; the VCC pin of the MPU6050 module ④ is connected to OUT3.3V, and the GND pin is connected to the negative terminal of the power supply.

[0019] The STM32F103c8t6 chip ⑪ is connected to the SCL1 and SDA1 pins of the OLED display screen ⑤ via pins PB8 and PB9 in sequence; the VCC pin of the OLED display screen ⑤ is connected to OUT3.3V, and the GND pin is connected to the negative terminal of the power supply.

[0020] The STM32F103c8t6 chip ⑪ is connected to the negative power supply via the PA11 pin and the green LED ⑥.

[0021] The STM32F103c8t6 chip ⑪ is connected to the negative power supply via the PA10 pin and the red LED ⑦.

[0022] The STM32F103c8t6 chip⑪ is connected to the base of the NPN transistor S8050⑧ via pin PA9.

[0023] The collector of the NPN transistor S8050⑧ is connected to OUT3.3V via a buzzer ⑨, and the emitter is connected to the negative terminal of the power supply.

[0024] The STM32F103c8t6 chip ⑪ is connected to the TRIG and ECHO pins of the HC-SR04 ultrasonic ranging module ⑩ via PA8 and PB13 pins respectively; the VCC pin of the HC-SR04 ultrasonic ranging module ⑩ is connected to OUT3.3V, and the GND pin is connected to the negative terminal of the power supply.

[0025] The device's communication circuit includes an NRF24L01 wireless transceiver module (12). (e.g.) Figure 3 (As shown)

[0026] The NRF24L01 wireless transceiver module ⑫ contains eight pins: VCC, GND, CE, CSN, SCK, MOSI, MISO, and IRQ.

[0027] In this circuit, the VCC pin of the NRF24L01 wireless transceiver module⑫ is connected to OUT3.3V, and the GND pin is connected to the negative power supply. The CE pin is connected to the PB0 pin of the STM32F103c8t6 chip⑪; the CSN pin is connected to the PA4 pin of the STM32F103c8t6 chip⑪; the SCK pin is connected to the PA5 pin of the STM32F103c8t6 chip⑪; the MOSI pin is connected to the PA7 pin of the STM32F103c8t6 chip⑪; the MISO pin is connected to the PA6 pin of the STM32F103c8t6 chip⑪; and the IRQ pin is connected to the PB1 pin of the STM32F103c8t6 chip⑪.

[0028] The 2000mA / h lithium battery consists of two 3.7V lithium batteries connected in series, outputting a voltage of 7.4V.

[0029] The main switch is a metal self-locking push-button switch with two positions: NO and OFF.

[0030] The 2000mA / h lithium battery, main control circuit board, and main switch are connected in series. First, the "+" pin of 3.7V lithium battery 1 is connected to the "-" pin of 3.7V lithium battery 2. Then, the "+" pin of 3.7V lithium battery 2 is connected via the main switch to the 7.4V pin extended from the VIN pin of the A1117-3.3 voltage conversion chip ① in the power conversion circuit of the main control circuit board. Finally, the GND pin of the main control circuit board is connected to the "-" pin of 3.7V lithium battery 1 (e.g., ...). Figure 4 (As shown).

[0031] The device housing includes: a fixing part, a battery box, a main body part, a main body cover, and a transparent cover (e.g., Figure 5 (As shown).

[0032] It is convenient to use. The device's outer casing is equipped with magnets, allowing it to be directly attached to the underside of the car scissor lift base, thus enabling easy deployment and disassembly.

[0033] No external power supply is required. The device is equipped with a high-capacity 2000mA / h lithium battery, giving it exceptional battery life. Furthermore, the use of a lithium battery eliminates the need for an external power source, significantly improving the device's convenience.

[0034] High reliability. The device is equipped with an MPU6050 module and an HC-SR04 ultrasonic ranging module, which monitors the height of the two lifting platforms above the ground and the tilt angle of the two lifting platforms in real time. When the two lifting platforms show a tilting trend or there is a height difference between the two lifting platforms above the ground, it will issue an audible and visual alarm to remind the operator and prevent safety accidents. Attached Figure Description

[0035] Figure 1 This is the schematic diagram of the power conversion circuit for the device.

[0036] Figure 2 This is the schematic diagram of the device's functional drive circuit.

[0037] Figure 3 This is the schematic diagram of the device's communication circuit.

[0038] Figure 4 This is the overall connection circuit schematic;

[0039] Figure 5 This is a structural diagram of the device's outer casing;

[0040] Figure 6 This is a structural diagram of the fixed part;

[0041] Figure 7 This is a structural diagram of the main body;

[0042] Figure 8 This is a structural diagram of the main cover plate;

[0043] Figure 9 This is a structural diagram of the transparent cover plate;

[0044] Figure 10 This is a structural diagram of the battery box;

[0045] The components include: A1117-3.3 voltage conversion chip ①; Capacitor I ②; Capacitor II ③; MPU6050 module ④; OLED display screen ⑤; Green LED ⑥; Red LED ⑦; NPN transistor S8050 ⑧; Buzzer ⑨; HC-SR04 ultrasonic ranging module ⑩; STM32F103c8t6 chip ⑪; NRF24L01 wireless transceiver module ⑫; 1. Fixed part; 1-1. Magnet mounting position; 2. Main body cover; 2-2. OLED display screen ⑤ mounting position; 2-3. Green LED ⑥ mounting position; 2-4. Red LED ⑦ mounting position; 3. Main body; 3-1. Main control circuit board mounting position; 3-2. HC-SR04 ultrasonic ranging module ⑩ mounting position; 3-3. Main switch mounting position; 4. Battery box; 5. Transparent cover.

[0046] Note: The negative terminal of the power supply is the common ground terminal of this device, and the term "negative terminal of the power supply" refers to the same thing throughout the text. Furthermore, the A1117-3.3 voltage conversion chip①, MPU6050 module④, OLED display⑤, HC-SR04 ultrasonic ranging module⑩, STM32F103c8t6 chip⑪, and NRF24L01 wireless transceiver module⑫ mentioned in this article are all existing technologies, and their internal circuit structures and principles will not be explained in detail here. Detailed Implementation

[0047] A safety warning device for car scissor lifts is characterized by a design consisting of one main unit and one slave unit. The main unit and slave unit have identical structures, including: a main control circuit board, a 2000mA / h lithium battery, a main switch, and a device housing.

[0048] The main control circuit board includes: a device power conversion circuit, a device function drive circuit, and a device communication circuit.

[0049] The power conversion circuit of the device is used to convert the 7.4V power supply voltage to 3.3V to power the device's functional drive circuit and communication circuit. The circuit principle is as follows: The A1117-3.3V voltage conversion chip ① converts the 7.4V voltage to 3.3V and outputs it through the VOUT pin, named OUT3.3V. Capacitors I ② and II ③, connected in parallel across the A1117-3.3V voltage conversion chip ①, act as filters.

[0050] The device's functional drive circuit is used to monitor the ground height and tilt angle of the two lifting platforms in real time during the lifting process of a car scissor lift. The circuit principle is as follows:

[0051] OUT3.3V is connected sequentially to the VCC pin of the MPU6050 module ④, OLED display ⑤, buzzer ⑨, HC-SR04 ultrasonic ranging module ⑩, and STM32F103c8t6 chip ⑪ to provide power to them.

[0052] The MPU6050 module ④ is used to collect the tilt angle of the current position of the lifting platform of the car scissor lift. After the SCL pin and SDA pin of this module are connected to the PB10 pin and PB11 pin of the STM32F103c8t6 chip ⑪ respectively, the collected tilt angle is sent to the STM32F103c8t6 chip ⑪ using the I2C communication protocol.

[0053] The HC-SR04 ultrasonic ranging module (10) is used to measure the height of the lifting platform of a car scissor lift above the ground. After the TRIG and ECHO pins of this module are connected to the PA8 and PB13 pins of the STM32F103c8t6 chip (11) respectively, the STM32F103c8t6 chip (11) can obtain the time it takes for the ultrasonic wave emitted by the HC-SR04 ultrasonic ranging module (10) to travel from the module to the ground and then back to the module, thereby calculating the distance between the top of the car scissor lift platform and the ground.

[0054] The OLED display screen ⑤ is used to display the collected tilt angle and height of the car scissor lift platform above the ground. After the SCL1 and SDA1 pins of this module are connected to the PB8 and PB9 pins of the STM32F103c8t6 chip ⑪ respectively, the STM32F103c8t6 chip ⑪ uses the I2C communication protocol to send the tilt angle and height above the ground to the OLED display screen ⑤ for display.

[0055] When the PA11 pin of the STM32F103c8t6 chip (11) outputs a high level, the green LED (6) is lit; when the PA11 pin outputs a low level, the green LED (6) is turned off.

[0056] When the PA10 pin of the STM32F103c8t6 chip ⑪ outputs a high level, the red LED ⑦ is lit; when the PA10 pin outputs a low level, the red LED ⑦ is turned off.

[0057] When the PA9 pin of the STM32F103c8t6 chip (11) outputs a high level, the NPN transistor S8050 (8) is turned on, and current flows from OUT3.3V through the buzzer (9) and the NPN transistor S8050 (8) to the negative terminal of the power supply, thus activating the buzzer (9). When the PA9 pin outputs a low level, the NPN transistor S8050 (8) is not turned on, and the buzzer (9) is turned off.

[0058] The device's communication circuit is used for data exchange between the master and slave devices to complete the device's real-time monitoring function. Its principle is as follows:

[0059] Connect the OUT3.3V pin to the VCC pin of the NRF24L01 wireless transceiver module ⑫ to supply power and enable it to work properly;

[0060] The NRF24L01 wireless transceiver module (⑫) transmits the tilt angle and height of the lifting platform to the host computer. The CE pin of this chip connects to the PB0 pin of the STM32F103c8t6 chip (⑪); the CSN pin connects to the PA4 pin; the SCK pin connects to the PA5 pin; the MOSI pin connects to the PA7 pin; the MISO pin connects to the PA6 pin; and the IRQ pin connects to the PB1 pin.

[0061] The STM32F103c8t6 chip⑪ can control the relevant pins of this module to transmit the tilt angle and height of the lifting platform to the NRF24L01 wireless transceiver module⑫, which then sends the data out.

[0062] The 2000mA / h lithium battery consists of two 3.7V lithium batteries connected in series, outputting a voltage of 7.4V.

[0063] The device housing includes: a fixed part 1, a battery box 4, a main body part 3, a main body cover 2, and a transparent cover 5.

[0064] Magnets are installed on the top of the fixed part to allow the device to adhere to the lifting platforms on both sides of the lift.

[0065] The battery box is used to store 3.7V lithium battery 1 and 3.7V lithium battery 2.

[0066] The main body 3 is used to house the main switch, the main control circuit board, and its related modules.

[0067] The main cover plate 2 has reserved holes for installing the OLED display screen ⑤, green LED ⑥, and red LED ⑦ in the main control circuit board.

[0068] The transparent cover plate 5 is used to protect the green LED ⑥ and red LED ⑦ from damage.

[0069] The device adopts a master-slave design, and its working principle is as follows:

[0070] The main unit and the slave unit are respectively installed on the lifting platforms on both sides of the car scissor lift to monitor the ground height and tilt angle of the lifting platforms on both sides in real time.

[0071] When the slave unit detects that the tilt angle of the lifting platform on that side does not exceed 3°, the green LED 6 of the slave unit lights up and the red LED 7 turns off. When the slave unit detects that the tilt angle of the lifting platform on that side exceeds 3°, the red LED 7 of the slave unit lights up and the green LED 6 turns off, and sends the tilt angle of the lifting platform to the master unit. After receiving the data, the master unit activates the buzzer 9 and lights up the red LED 7 and turns off the green LED 6. Similarly, when the master unit detects that the tilt angle of the lifting platform on that side exceeds 3°, the buzzer 9 of the master unit is activated, the red LED 7 lights up, and the green LED 6 turns off, thus realizing an audible and visual alarm.

[0072] When the slave unit detects that the tilt angle of the lifting platform on that side does not exceed 3°, the green LED 6 of the slave unit lights up and the red LED 7 is turned off. At this time, the slave unit measures the height of the lifting platform on that side above the ground and sends the measurement data to the master unit. After receiving the data, the master unit measures the height of the lifting platform on that side above the ground and compares the height data on both sides. If the height difference is greater than 8mm, the buzzer 9 of the master unit is activated, the red LED 7 lights up, and the green LED 6 turns off, thus realizing an audible and visual alarm.

[0073] The method of using this utility model is as follows:

[0074] The master and slave units are installed on the lifting platforms on both sides respectively.

[0075] Set the main switch of the master and slave units to the ON position. At this time, the master and slave units will enter the working state. During the lifting process, if the tilt angle of either lifting platform exceeds 3°, the master unit will issue an audible and visual alarm. If the tilt angle of either lifting platform does not exceed 3°, compare the height of the two lifting platforms to the ground. If the height difference is greater than 8mm, an audible and visual alarm will be issued.

[0076] Users can decide whether to remove the device based on their own circumstances. If they choose to remove it, they can simply take the device off the lifting platforms on both sides.

[0077] The safety warning device for car scissor lifts has been completed and is being used in vehicle lifting operations. Users can use this device to prevent accidents such as car rollovers caused by improper operation or deviation of the vehicle's center of gravity during lifting.

Claims

1. A safety warning device for a car scissors lift, characterized in that: The device adopts a master-slave design scheme, the master and the slave have the same structure, the master comprises a master control circuit board, a 2000mA / h lithium battery, a total switch and a device shell; The master control circuit board comprises a device power conversion circuit, a device function driving circuit and a device communication circuit; The device power conversion circuit is used for converting a 7.4V power supply voltage into a 3.3V voltage, and the device function driving circuit and the device communication circuit are powered, the A1117-3.3 voltage conversion chip ① converts the 7.4V voltage into the 3.3V voltage, and the converted voltage is output by the VOUT pin and named as OUT3.3V, and the capacitor I ② and the capacitor II ③ connected in parallel between the two ends of the A1117-3.3 voltage conversion chip ① have a filtering effect; the A1117-3.3 voltage conversion chip ① comprises three pins of VIN, GND and VOUT; the circuit is connected in sequence from the 7.4V pin extended from the VIN pin of the A1117-3.3 voltage conversion chip ① to the negative pole of the power supply, and the other path is connected to the VIN pin of the A1117-3.3 voltage conversion chip ①; the GND pin of the A1117-3.3 voltage conversion chip ① is connected to the negative pole of the power supply; the A1117-3.3 voltage conversion chip ① converts the 7.4V voltage into the 3.3V voltage, and the converted voltage is output by the VOUT pin and named as OUT3.3V, and the device function driving circuit and the device communication circuit are powered, and the capacitor II ③ is connected to the negative pole of the power supply; The device function driving circuit is used for monitoring the height of the two lifting platforms and the inclination angle of the two lifting platforms in the lifting process of the automobile shearing lifting machine; the MPU6050 module ④ comprises four pins of VCC, SCL, SDA and GND; the OLED display screen ⑤ comprises four pins of VCC, SCL1, SDA1 and GND; the green LED ⑥ and the red LED ⑦ comprise two pins of positive and negative; the NPN triode S8050 ⑧ comprises three pins of collector, base and emitter; the buzzer ⑨ comprises two pins of positive and negative; the HC-SR04 ultrasonic ranging module ⑩ comprises four pins of VCC, TRIG, ECHO and GND; this part of the circuit takes the STM32F103c8t6 chip ⑪ as the master control chip, and the OUT3.3V is connected to the STM32F103c8t6 chip ⑪ to power it; the STM32F103c8t6 chip ⑪ is connected in sequence to the SCL and SDA pins of the MPU6050 module ④ through the PB10 and PB11 pins; the VCC pin of the MPU6050 module ④ is connected to the OUT3.3V, and the GND pin is connected to the negative pole of the power supply. The STM32F103c8t6 chip ( 4) is connected with the SCL1 and SDA1 pins of the OLED display screen ( 5) through the PB8 and PB9 pins in sequence; the VCC pin of the OLED display screen ( 5) is connected with the OUT3.3V, and the GND pin is connected with the negative pole of the power supply; the STM32F103c8t6 chip ( 4) is connected with the negative pole of the power supply through the PA11 pin and the green LED ( 6); the STM32F103c8t6 chip ( 4) is connected with the negative pole of the power supply through the PA10 pin and the red LED ( 7); the STM32F103c8t6 chip ( 4) is connected with the base of the NPN triode S8050 ( 8) through the PA9 pin; the collector of the NPN triode S8050 ( 8) is connected with the OUT3.3V through the buzzer ( 9), and the emitter is connected with the negative pole of the power supply; the STM32F103c8t6 chip ( 4) is connected with the TRIG and ECHO pins of the HC-SR04 ultrasonic ranging module ( 10) through the PA8 and PB13 pins in sequence; the VCC pin of the HC-SR04 ultrasonic ranging module ( 10) is connected with the OUT3.3V, and the GND pin is connected with the negative pole of the power supply; The device communication circuit is used for data interaction between the master and the slave to complete the real-time monitoring function of the device; wherein the NRF24L01 wireless transceiver module ( 21) comprises eight pins of VCC, GND, CE, CSN, SCK, MOSI, MISO and IRQ; In the part of the circuit, the VCC pin of the NRF24L01 wireless transceiver module ( 21) is connected with the OUT3.3V, the GND pin is connected with the negative pole of the power supply, the CE pin is connected with the PB0 pin of the STM32F103c8t6 chip ( 4); the CSN pin is connected with the PA4 pin of the STM32F103c8t6 chip ( 4); the SCK pin is connected with the PA5 pin of the STM32F103c8t6 chip ( 4); the MOSI pin is connected with the PA7 pin of the STM32F103c8t6 chip ( 4); the MISO pin is connected with the PA6 pin of the STM32F103c8t6 chip ( 4); and the IRQ pin is connected with the PB1 pin of the STM32F103c8t6 chip ( 4); The master and the slave are respectively installed on the lifting platforms on the two sides of the automobile scissor lift; when the slave monitors that the inclination angle of the lifting platform on the side does not exceed 3°, the green LED ( 6) of the slave is lighted, and the red LED ( 7) is extinguished; when the slave monitors that the inclination angle of the lifting platform on the side exceeds 3°, the red LED ( 7) of the slave is lighted, the green LED ( 6) is extinguished, and the inclination angle of the lifting platform is sent to the master; after the master receives the data, the buzzer ( 9) of the master is activated, the red LED ( 7) is lighted, and the green LED ( 6) is extinguished; similarly, when the master monitors that the inclination angle of the lifting platform on the side exceeds 3°, the buzzer ( 9) of the master is activated, the red LED ( 7) is lighted, and the green LED ( 6) is extinguished, so that the sound and light alarm is realized. When the slave machine monitors that the lifting platform on the side does not exceed 3°, the green LED (6) of the slave machine is lighted, and the red LED (7) is extinguished. At this time, the slave machine measures the height of the lifting platform on the side to the ground, and sends the measured data to the master machine. After receiving the data, the master machine measures the height of the lifting platform on the side to the ground, and compares the height data of the two sides. If the height difference is greater than 8mm, the buzzer (9) of the master machine is activated, the red LED (7) is lighted, and the green LED (6) is extinguished, so as to realize the sound and light alarm.

2. The safety warning device for a car scissors hoist according to claim 1, characterized in that: The 2000mA / h lithium battery is composed of two 3.7V lithium batteries in series, and outputs 7.4V voltage.

3. The safety warning device for the automobile scissor lift according to claim 1, characterized in that: The device shell comprises a fixed part, a battery box, a main body part, a main body cover plate, and a transparent cover plate. The fixed part is provided with a magnet on the top, which is used to attract the device to the lifting platform on both sides of the lifting machine. The battery box is used to store the 3.7V lithium battery 1 and the 3.7V lithium battery 2. The main body part is used to arrange the main switch, the main control circuit board and the related modules contained therein. The main body cover plate is provided with a reserved hole position, which is used to install the OLED display screen (5), the green LED (6), and the red LED (7) in the main control circuit board.

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