Wheel excavator rotating speed measurement sensor device based on WiFi transmission protocol

Abstract

The utility model provides a wheel excavator rotating speed measurement sensor device based on a WiFi transmission protocol, relates to the technical field of excavator control, and aims to solve the problems that the conventional rotating speed acquisition sensor generally adopts a wired rotating speed sensor, and when the wired rotating speed sensor spans a rotating platform and a chassis, the rotating speed sensor rotates, so that the rotating speed of a wheel excavator cannot be measured. A slip ring is additionally arranged at a rotation position to realize signal transmission of a wire, but the structure is high in maintenance difficulty and poor in signal credibility, the accuracy of rotating speed acquisition of a gearbox is reduced, the transmission range of a rotating speed signal is limited, and the signal breakage and the equipment maintenance cost are greatly increased; comprising a sensor acquisition module, a first voltage stabilization module, a second voltage stabilization module, a transmission module and a battery assembly, through the rotation speed measurement sensor device, the problems of an existing rotation speed acquisition sensor in the aspects of rotation speed signal acquisition and transmission are solved, the acquisition accuracy is improved, and signal breakage and equipment maintenance cost are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of excavator control, and particularly relates to a wheeled excavator speed measurement sensor device based on a WiFi transmission protocol. Background Art

[0002] The statements in this part merely provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] With the rapid development of China's excavator market, wheeled excavators are widely used in municipal engineering construction, community greening construction and other fields due to their superior driving functions. In order to give full play to the driving advantages of wheeled excavators, research on the vehicle speed calculation of wheeled excavators has been intensified.

[0004] The inventor found that in existing engineering machinery wheeled excavator products, the vehicle speed calculation is mainly realized by collecting the gearbox speed signal through a speed acquisition sensor. However, the existing speed acquisition sensors generally use wired speed sensors. When the wired speed sensor crosses the slewing platform and the chassis, there is a rotation situation, which affects the acquisition of the gearbox speed, and then leads to inaccurate vehicle speed measurement. To solve this problem, a slip ring is added at the slewing position in the existing products to realize the signal transmission of the wire. However, this structure has a large maintenance difficulty, poor signal credibility, reduces the accuracy of the gearbox speed acquisition, and then affects the accuracy of the vehicle speed calculation. At the same time, the transmission range of the speed signal is limited, greatly increasing the signal loss and equipment maintenance cost. Summary of the Utility Model

[0005] Aiming at the deficiencies of the existing technology, the utility model provides a wheeled excavator speed measurement sensor device based on a WiFi transmission protocol. Through the wheeled excavator speed measurement sensor device, the speed of the gearbox is collected, avoiding the rotation when crossing the slewing platform and the chassis, which affects the acquisition of the gearbox speed, and realizing the cross-region and cross-movement transmission of the speed signal.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] In a first aspect, a wheeled excavator speed measurement sensor device based on a WiFi transmission protocol is disclosed, including: a sensor acquisition module, a first voltage stabilization module, a second voltage stabilization module, a transmission module and a battery assembly;

[0008] The sensor acquisition module is installed on the gearbox, and is used for collecting the speed signal of the gearbox to obtain a speed voltage signal, and transmitting it to the transmission module through a wireless transmission method; the sensor is connected in series with the first voltage stabilization module, and is connected in parallel with the series-connected transmission module and the second voltage stabilization module to the battery assembly;

[0009] Among them, the sensor acquisition module includes a sensor, an upper resistor and a capacitor. One end of the upper resistor is connected to the input terminal of the sensor, and the other end is connected in series with the capacitor. One end of the capacitor is connected to the output terminal of the sensor. Through the upper resistor and the capacitor, the rotational speed output signal is converted into a voltage signal and transmitted to the transmission module.

[0010] As a further technical solution, the transmission module includes an MCU, a voltage conversion module and a WiFi module. The first serial port of the MCU is connected to the output terminal of the sensor, the second serial port of the MCU is connected to the WiFi module, and the connection line between the WiFi module and the third serial port of the MCU is connected. The voltage conversion module is connected in series with the second voltage stabilization module.

[0011] As a further technical solution, the positive electrode of the battery assembly is connected to the parallel first voltage stabilization module and the second voltage stabilization module, and the negative electrode of the battery assembly is grounded together with the grounding terminal of the sensor, the fourth serial port of the MCU, and the connection line of the WiFi module.

[0012] As a further technical solution, the WiFi module adopts a wireless transmission method.

[0013] As a further technical solution, the first voltage stabilization module includes a first resistor, a first capacitor, a second capacitor and a first chip. After the first capacitor, the second capacitor and the first chip are connected in parallel, the input end is connected to the positive electrode of the battery assembly through the first resistor, and the output end is connected to the input terminal of the sensor.

[0014] As a further technical solution, the second voltage stabilization module includes a second resistor, a third capacitor, a fourth capacitor and a second chip. After the third capacitor, the fourth capacitor and the second chip are connected in parallel, the input end is connected to the positive electrode of the battery assembly through the second resistor, and the output end is connected to the voltage conversion module.

[0015] As a further technical solution, the voltage conversion module adopts a buck voltage regulator for reducing the voltage provided by the battery assembly to 3.3V.

[0016] As a further technical solution, the input end of the buck voltage regulator is connected to the voltage stabilization module, and the output end is respectively connected to the MCU and the WiFi module to provide 3.3V voltage for the MCU and the WiFi module.

[0017] As a further technical solution, the battery assembly includes a battery replacement slot and a battery.

[0018] As a further technical solution, the battery replacement slot is installed at a touchable position on the chassis of the wheeled excavator for placing and replacing the battery.

[0019] One or more technical solutions of the present utility model have the following beneficial effects:

[0020] In this embodiment, the rotational speed measurement sensor device provides strong technical support for the wheeled excavator to collect feasible gearbox rotational speed signals, realizes wireless transmission, greatly reduces signal loss and equipment maintenance costs, and improves the collection accuracy.

[0021] In this embodiment, the sensor uses a wireless acquisition method to collect the rotational speed of the gearbox, avoiding the rotation when the wired sensor crosses the slewing platform and the chassis, which affects the collection of the gearbox rotational speed. The WiFi module is used for wireless transmission and broadcasting, realizing the transmission of rotational speed signals across regions and movements.

[0022] Advantages of additional aspects of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specification drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0024] Figure 1 It is the overall structure diagram of the rotational speed measurement device of the wheeled excavator in this embodiment;

[0025] Figure 2 It is the schematic structural diagram of the first voltage stabilization module in this embodiment;

[0026] Figure 3 It is the schematic structural diagram of the second voltage stabilization module in this embodiment; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model.

[0029] Without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0030] Embodiment 1

[0031] Such as Figure 1As shown in the figure, the utility model provides a wheeled excavator rotational speed measurement sensor device based on the WiFi transmission protocol, including:

[0032] a sensor acquisition module, a first voltage stabilization module, a second voltage stabilization module, a transmission module, and a battery assembly;

[0033] The sensor acquisition module is installed on the gearbox of the wheeled excavator, used to collect the rotational speed signal of the gearbox, convert the collected rotational speed signal into a voltage signal, and transmit it to the transmission module through a wireless transmission method; the sensor acquisition module is connected in series with the first voltage stabilization module, and is connected in parallel with the series-connected transmission module and the second voltage stabilization module to the battery assembly.

[0034] The battery assembly powers the entire working device. The first voltage stabilization module stabilizes the power supply voltage provided by the battery assembly to power the sensor acquisition module. The second voltage stabilization module stabilizes the power supply voltage provided by the battery assembly to power the transmission module. The transmission module filters the received voltage signal, calculates the frequency value, and performs wireless transmission and broadcasting.

[0035] In this embodiment, the sensor acquisition module includes a sensor, an upper resistor R L and a capacitor C L . One end of the upper resistor R L is connected to the input terminal of the sensor, and the other end is connected in series with the capacitor C L . One end of the capacitor C L is connected to the output terminal of the sensor. Through the upper resistor R L and the capacitor C L , the rotational speed output signal is converted into a voltage signal V out , and is transmitted to the transmission module.

[0036] Through the sensor acquisition module, the rotational speed signal of the gearbox is collected, and the rotational speed signal is converted into a voltage signal, which is convenient for the transmission module to process. The wireless acquisition method is adopted to avoid the rotation of the wired sensor across the slewing platform and the chassis, which affects the acquisition of the rotational speed of the gearbox.

[0037] In this embodiment, the transmission module includes an MCU, a voltage transformation module, and a WiFi module. The first serial port of the MCU is connected to the output terminal of the sensor, used to receive the voltage signal V out , and preprocess the rotational speed voltage signal V out , and the rotational speed voltage signal V outFiltering is performed to obtain a stable signal, and the frequency value is calculated. The second serial port of the MCU is connected to the WiFi module, and the calculated frequency value is transmitted to the WiFi module. According to the communication protocol of the WiFi module, the data is wirelessly transmitted and broadcast in a specific frequency band, realizing wireless transmission. The WiFi module is connected to the third serial port of the MCU through a connection line, and is connected in series with the second voltage stabilizing module through a voltage transformation module to provide the required stable 3.3V voltage for the MCU and the WiFi module, ensuring the normal operation of the MCU and the WiFi module.

[0038] Through the transmission module, the cross-region and cross-movement transmission of the rotational speed signal is realized, greatly reducing the signal loss and the equipment maintenance cost.

[0039] See Figure 2 As shown, in this embodiment, the first voltage stabilizing module includes a first resistor R1, a first capacitor C1, a second capacitor C2, and a first chip TLV431. After the first capacitor C1, the second capacitor C2, and the TLV431 chip are connected in parallel, the input end is connected to the positive pole of the battery assembly through the first resistor R1, and the output end is connected to the sensor input wiring terminal for obtaining a 5V voltage that meets the normal operation of the rotational speed acquisition sensor.

[0040] Through the first voltage stabilizing module, the voltage can be stabilized at 5V, ensuring the normal operation of the rotational speed acquisition sensor.

[0041] See Figure 3 As shown, in this embodiment, the second voltage stabilizing module includes a second resistor R2, a third capacitor C3, a fourth capacitor C4, and a second chip TLV431. After the third capacitor C3, the fourth capacitor C4, and the second chip TLV431 are connected in parallel, the input end is connected to the positive pole of the battery assembly through the second resistor R2, and the output end is connected to the voltage transformation module for obtaining a stable 5V voltage and transmitting it to the voltage transformation module.

[0042] Through the second voltage stabilizing module, a stable 5V voltage can be obtained.

[0043] In this embodiment, the first voltage stabilizing module and the second voltage stabilizing module can not only be designed as the above voltage stabilizing circuits, but also adopt other existing voltage stabilizing designs and can be arbitrarily selected according to actual requirements.

[0044] In this embodiment, obtaining a stable 5V voltage can ensure the normal operation of the sensor, but the 5V voltage does not meet the working requirements of the MCU and the WiFi module. It is necessary to first convert the 5V voltage to 3.3V voltage to ensure the normal operation of the MCU and the WiFi module.

[0045] The voltage conversion module can directly use a step-down voltage regulator. The input terminal of the step-down voltage regulator is connected to the voltage regulation module, and the output terminals are respectively connected to the MCU and the WiFi module. It is used to step down the received 5V voltage to 3.3V and transmit it to the MCU and the WiFi module, enabling the MCU and the WiFi module to work properly.

[0046] Among them, the model of the step-down voltage regulator is LM5576.

[0047] Through the voltage conversion module, the stable 5V voltage is converted into 3.3V voltage suitable for the normal operation of the MCU and the WiFi module, enabling the MCU to preprocess the received rotational speed voltage signal, calculate the frequency value, and transmit the frequency value to the WiFi module. The WiFi module wirelessly transmits and broadcasts the data according to the received frequency value through the protocol in a specific frequency band, realizing the cross-region and cross-movement transmission of the rotational speed signal.

[0048] In this embodiment, in addition to directly using a step-down voltage regulator, the voltage conversion module can also adopt an existing voltage conversion design to convert the stable 5V voltage into 3.3V voltage, thus ensuring the normal operation of the MCU and the WiFi module.

[0049] In this embodiment, the positive electrode of the battery assembly is connected to the parallel first voltage regulation module and the second voltage regulation module. The negative electrode of the battery assembly is grounded together with the grounding terminal of the sensor, the fourth serial port of the MCU, and the connecting wire of the WiFi module. The battery assembly is designed with a replaceable battery slot. By placing the corresponding model battery into the battery replacement slot and installing the battery replacement slot at a touchable position on the chassis of the wheeled excavator, the entire working equipment can be powered, and at the same time, it is convenient to replace the battery. When the battery runs out of power, the failed battery can be replaced in time.

[0050] In this embodiment, a trailing wire is provided on the battery replacement slot. By setting the length of the trailing wire, the battery replacement slot can be installed at the required position on the chassis of the wheeled excavator according to the actual position requirements.

[0051] In this embodiment, in order to solve the problems of the acquisition and transmission of the rotational speed signal of the wheeled excavator gearbox, a wheeled excavator rotational speed measurement sensor device is designed. The rotational speed acquisition sensor uses a wireless acquisition method to acquire the rotational speed signal of the gearbox, avoiding the rotation of the wired sensor when crossing the slewing platform and the chassis, which affects the acquisition of the rotational speed of the gearbox, improving the accuracy of the rotational speed acquisition. At the same time, the WiFi module is used for wireless transmission and broadcasting to realize the cross-region and cross-movement transmission of the rotational speed signal, greatly reducing the signal loss and the equipment maintenance cost.

[0052] See Figure 1 as shown, the specific implementation principle:

[0053] According to the position of the selected battery replacement slot, select a battery replacement slot trailing wire of an appropriate length, place a battery of the corresponding model in the battery slot, install the battery replacement slot on the wheeled excavator chassis, and the battery assembly starts to work normally. To ensure the normal operation of the rotational speed acquisition sensor, first pass through the first voltage stabilization module to stabilize the supply voltage and obtain a stable 5V voltage suitable for the normal operation of the rotational speed acquisition sensor, enabling the sensor to collect the rotational speed signal of the wheeled excavator gearbox. To meet the subsequent MCU processing, through the upper resistor, convert the rotational speed output signal into a voltage signal and output it to the MCU for signal preprocessing; to ensure the normal operation of the MCU and the WiFi module, first pass through the second voltage stabilization module to stabilize the supply voltage and obtain a stable 5V voltage. However, the voltage during the normal operation of the MCU and the WiFi module is 3.3V. Then, pass through the 3.3V voltage conversion module to convert the stable 5V voltage into 3.3V voltage to enable the normal operation of the MCU and the WiFi module. The MCU filters the received rotational speed voltage signal, calculates the frequency value after obtaining a stable signal, and transmits the frequency value to the WiFi module. The WiFi module wirelessly transmits and broadcasts the data according to the protocol in a specific frequency band, finally completing the acquisition and transmission of the rotational speed signal of the wheeled excavator gearbox and realizing the cross-region and cross-movement transmission of the rotational speed signal.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wheeled excavator rotational speed measurement sensor device based on the WiFi transmission protocol, characterized in that, Including: A sensor acquisition module, a first voltage stabilization module, a second voltage stabilization module, a transmission module, and a battery assembly; The sensor acquisition module is installed on the gearbox and is used to collect the rotational speed signal of the gearbox to obtain a rotational speed voltage signal, which is transmitted to the transmission module through a wireless transmission method; the sensor acquisition module is connected in series with the first voltage stabilization module and is connected in parallel with the series-connected transmission module and the second voltage stabilization module to be connected to the battery assembly; Among them, the sensor acquisition module includes a sensor, an upper resistor, and a capacitor. One end of the upper resistor is connected to the input terminal of the sensor, and the other end is connected in series with the capacitor. One end of the capacitor is connected to the output terminal of the sensor. Through the upper resistor and the capacitor, the rotational speed output signal is converted into a voltage signal and transmitted to the transmission module.

2. The rotational speed measuring sensor device of a wheeled excavator based on the WiFi transmission protocol according to claim 1, characterized in that, The transmission module includes an MCU, a voltage conversion module, and a WiFi module. The first serial port of the MCU is connected to the output terminal of the sensor, the second serial port of the MCU is connected to the WiFi module, and the connection line between the WiFi module and the third serial port of the MCU is connected. It is connected in series with the second voltage stabilization module through the voltage conversion module.

3. The rotational speed measurement sensor device of a wheeled excavator based on the WiFi transmission protocol according to claim 1, characterized in that, The positive electrode of the battery assembly is connected to the parallel-connected first voltage stabilization module and the second voltage stabilization module, and the negative electrode of the battery assembly is grounded together with the grounding terminal of the sensor, the fourth serial port of the MCU, and the connection line of the WiFi module.

4. The rotational speed measurement sensor device of a wheeled excavator based on the WiFi transmission protocol according to claim 2, characterized in that, The WiFi module uses a wireless transmission method.

5. The rotational speed measuring sensor device of a wheeled excavator based on the WiFi transmission protocol according to claim 1, characterized in that, The first voltage stabilization module includes a first resistor, a first capacitor, a second capacitor, and a first chip. After the first capacitor, the second capacitor, and the first chip are connected in parallel, the input terminal is connected to the positive electrode of the battery assembly through the first resistor, and the output terminal is connected to the input terminal of the sensor.

6. The rotational speed measuring sensor device of a wheeled excavator based on the WiFi transmission protocol according to claim 1, characterized in that, The second voltage stabilization module includes a second resistor, a third capacitor, a fourth capacitor, and a second chip. After the third capacitor, the fourth capacitor, and the second chip are connected in parallel, the input terminal is connected to the positive electrode of the battery assembly through the second resistor, and the output terminal is connected to the voltage conversion module.

7. The rotational speed measurement sensor device of a wheeled excavator based on the WiFi transmission protocol according to claim 2, characterized in that, The voltage conversion module uses a buck voltage regulator to reduce the voltage provided by the battery assembly to 3.3V.

8. The rotational speed measurement sensor device of a wheeled excavator based on the WiFi transmission protocol according to claim 7, characterized in that, The input terminal of the buck voltage regulator is connected to the second voltage stabilization module, and the output terminal is respectively connected to the MCU and the WiFi module.

9. The rotational speed measuring sensor device of a wheeled excavator based on the WiFi transmission protocol according to claim 1, characterized in that, The battery assembly includes a battery replacement slot and a battery.

10. The rotational speed measurement sensor device of a wheeled excavator based on the WiFi transmission protocol according to claim 9, characterized in that, The battery replacement slot is installed at a touchable position on the chassis of the wheeled excavator and is used for placing and replacing the battery.

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