A method and device for measuring the rotation speed of a cement slurry mixer

Abstract

The present invention provides a method and device for measuring the rotation speed of a cement slurry mixer, including a process for measuring the revolution speed of a revolution shaft, a process for measuring the relative revolution speed of a rotation shaft, and a process for calculating the rotation speed of a cement slurry mixer; the process for calculating the rotation speed of the cement slurry mixer includes: subtracting the revolution speed of the revolution shaft from the measured revolution speed of the rotation shaft to obtain the rotation speed of the cement slurry mixer. The present invention utilizes the principle of relative motion to obtain the rotation speed of the cement slurry mixer by subtracting the revolution speed of the revolution shaft from the revolution speed of the rotation shaft. The cement slurry mixer does not need to be disassembled to determine the reduction ratio of the gear mechanism, thereby eliminating the potential safety hazards caused by disassembling the equipment and improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of mixer speed measurement, in particular to a method and a device for measuring the rotation speed of a cement slurry mixer. Background Art

[0002] Cement slurry mixer is a standard equipment for measuring cement physical properties experiments. It mixes cement and water in a certain proportion and stirs them into a uniform test slurry for measuring cement standard consistency, setting time and making stability test blocks. It is one of the necessary and indispensable equipment for cement plants, construction units, relevant professional colleges and scientific research institutions' cement laboratories, and is widely used in transportation engineering, construction engineering and other fields.

[0003] The cement slurry mixer 100 is mainly composed of a two-speed motor, a transmission box, a main shaft, an eccentric seat, a stirring blade 101, a stirring pot, a base, a column, a support, an outer cover, a program controller, etc. The working principle is as follows: the two-speed motor transmits power to the worm in the transmission box through a coupling, and then transmits it to the main shaft through a worm wheel and a pair of gears and decelerates. The main shaft drives the eccentric seat to rotate synchronously, so that the stirring blade fixed on the eccentric seat revolves. At the same time, the stirring blade completes the self-rotation motion around the fixed internal gear through the planetary gear at the upper end of the stirring blade shaft. The two-speed motor automatically completes the prescribed working procedure of slowing down, stopping and turning quickly through the control of the time controller. The stirring pot and the slide plate are locked by the core groove rotation.

[0004] Speed ​​is the main technical parameter of cement slurry mixer, which includes revolution speed and self-rotation speed. The accuracy of speed directly affects the physical properties of engineering materials, and further affects the quality of engineering and construction safety. In order to ensure the accuracy of the speed of cement slurry mixer, the speed of cement slurry mixer needs to be calibrated. According to research and literature search, the revolution speed of cement slurry mixer can be measured by speed measuring devices such as tachometer, but the direct measurement of self-rotation speed of cement slurry mixer by speed measuring device is still blank in China. The self-rotation speed of cement slurry mixer is the relative self-rotation speed of mixing blade minus the revolution speed, where the directions of self-rotation and revolution are opposite, revolution is counterclockwise and self-rotation is clockwise. The existing measurement method can only use indirect method: the self-rotation speed of cement slurry mixer is obtained by converting the revolution speed and the reduction ratio of gear mechanism. The revolution speed can be directly measured, while the reduction ratio of gear mechanism needs to be disassembled to obtain the equipment under inspection. Such indirect measurement method is not conducive to personnel safety and equipment safety and is inefficient.

[0005] In summary, the existing measurement methods have the following three problems: ① The indirect detection method of the self-rotation speed of the cement slurry mixer requires the disassembly and assembly of the mixer. The cement slurry mixer is generally powered by three-phase electricity, which poses a risk of electric shock. This operation method is inconvenient, not conducive to the use and maintenance of the equipment, and not conducive to the safety of personnel; ② Due to the gap between the gear and the ring gear of the planetary gear, there is a certain error between the self-rotation speed of the stirring blade calculated using the orbital speed of the stirring blade and the reduction ratio of the gear mechanism and the actual self-rotation speed. As the use time increases, the gear will wear and the error may become larger and larger. In this case, the indirect detection method cannot detect the change in error; ③ The indirect detection method of the self-rotation speed of the mixer has low working efficiency, and the annual inspection workload of the cement slurry mixer is relatively large, requiring a lot of manpower and material resources. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a method and a speed measuring device for measuring the rotation speed of a cement slurry mixer. By utilizing the principle of relative motion, the rotation speed of the cement slurry mixer is obtained by subtracting the measured rotation speed of the orbital shaft from the measured rotation speed of the autorotation shaft. There is no need to disassemble the mixer or convert the orbital speed with the reduction ratio of the gear mechanism, thereby improving work efficiency and measurement accuracy and eliminating safety hazards.

[0007] The present invention is implemented as follows: a method for measuring the rotation speed of a cement slurry mixer, including a process of measuring the revolution speed of a revolution shaft, a process of measuring the relative rotation speed of a rotation shaft, and a process of calculating the rotation speed of the cement slurry mixer;

[0008] The calculation process of the self-rotation speed of the cement slurry mixer includes: subtracting the orbital speed of the orbital shaft from the measured self-rotation speed of the rotating shaft to obtain the self-rotation speed of the cement slurry mixer.

[0009] Furthermore, the process of measuring the revolution speed of the revolution shaft comprises the following steps:

[0010] Step S11, fixing the detected part on the revolution axis;

[0011] Step S12, fixing the speed measuring device on the mixer frame, and adjusting the position and angle of the speed measuring device so that the detection part of the speed measuring device is aligned with the detected part on the revolution axis;

[0012] Step S13, start the cement slurry mixer and the speed measuring device to start working. When the cement slurry mixer starts working, the speed measuring device starts to directly measure the revolution speed of the revolution shaft, and reads the value of the revolution speed after the speed stabilizes and records it.

[0013] Furthermore, the relative rotation speed measurement process of the rotating shaft includes the following steps:

[0014] Step S21, fixing the detected part on the rotating shaft;

[0015] Step S22, fixing the rotation speed measuring device on the eccentric seat of the revolution shaft, and aligning the detection part of the rotation speed measuring device with the detected part on the rotation shaft;

[0016] Step S23, start the cement slurry mixer and the speed measuring device to start working. When the cement slurry mixer starts working, the speed measuring device rotates with the orbital shaft and starts to directly measure the rotation speed of the rotating shaft; after the speed stabilizes, read the value of the rotation speed of the rotating shaft and record it.

[0017] Furthermore, the calculation process of the rotation speed of the cement slurry mixer is further as follows: the measured orbital speed of the revolution shaft and the rotation speed of the rotation shaft are transmitted to the computer in the form of digital signals through the wireless transmission module, and the automatic detection software on the computer receives the data; then the automatic detection software subtracts the rotation speed of the rotation shaft from the received orbital speed of the revolution shaft to obtain the rotation speed of the cement slurry mixer, and forms original records and reports, which are finally stored in the database of the server.

[0018] The present invention also provides a rotation speed measuring device for a cement slurry mixer, comprising:

[0019] Main control chip;

[0020] A rotation speed sensor, the rotation speed sensor is connected to the main control chip;

[0021] Auxiliary circuit, the auxiliary circuit includes a power supply auxiliary circuit, a signal receiving and transmitting auxiliary circuit and a crystal oscillator auxiliary circuit; the crystal oscillator auxiliary circuit is connected to the main control chip;

[0022] A power supply, wherein the power supply, the power auxiliary circuit, and the main control chip are connected in sequence;

[0023] A wireless transmission module, the wireless transmission module is connected to the main control chip;

[0024] The antenna assembly, the signal receiving and transmitting auxiliary circuit, and the main control chip are connected in sequence.

[0025] Furthermore, the wireless transmission module is a Bluetooth module.

[0026] Furthermore, the main control chip and the wireless transmission module are integrated into one piece.

[0027] Furthermore, the rotation speed sensor is a high-frequency magnetic resistance switch.

[0028] Further, the main control chip includes a DVDD pin, an AVDD_DREG pin, a DVDD_USB pin, a P20 pin, an AVDDS / AVDD_SOC pin, an AVDD1 pin, an AVDD2 pin, an AVDD3 pin, an AVDD4 pin, an AVDD_GUARD pin, an RF_P pin, an RF_N pin, a P23 pin, a P24 pin, an XOSSC32M_Q1 pin, an XOSSC32M_Q2 pin, a DCOUPL pin, an RBLAS pin and a GND pin; the GND pin is grounded;

[0029] The rotation speed sensor includes three pins, one of which is grounded, another is connected to the P20 pin, and the third is connected to the DVDD_USB pin;

[0030] The power auxiliary circuit includes an inductor L1, a capacitor C1, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8 and a capacitor C9; the positive electrode of the power supply is connected to one end of the inductor L1, and the other end of the inductor L1 is respectively connected to the DVDD pin, the AVDD_DREG pin, the AVDDS / AVDD_SOC pin, the AVDD1 pin, the AVDD2 pin, the AVDD3 pin and the AVDD4 pin; one end of the capacitor C1 is connected between the other end of the inductor L1 and the AVDD_DREG pin; one end of the capacitor C3 is connected between the other end of the inductor L1 and the DVDD pin; one end of the capacitor C4 is connected between the other end of the inductor L1 and the AVDDS / AVDD_SOC pin; one end of the capacitor C5 is connected between the other end of the inductor L1 and the AVDD3 pin; the AVDD1 pin, The AVDD2 pin and the AVDD4 pin are connected in parallel to one end of the capacitor C6, one end of the capacitor C8 and the other end of the inductor L1 respectively; one end of the capacitor C7 is connected between the other end of the inductor L1 and the AVDD_GUARD pin; one end of the capacitor C9 is connected to the other end of the inductor L1; the other ends of the capacitors C1, C3, C4, C5, C6, C7, C8 and C9 are grounded respectively;

[0031] The antenna assembly includes an external antenna base U2 and an antenna;

[0032] The signal receiving and transmitting auxiliary circuit includes an external antenna base U2, a resistor R7, a resistor R6, a capacitor C10, a capacitor C12, a capacitor C13, a capacitor C14, an inductor L2, an inductor L3, and an inductor L9. and inductor L10; one end of resistor R6 is connected to a contact of the external antenna base U2, the other contact of the external antenna base U2 is grounded, one end of resistor R7 is connected to the antenna, the other ends of resistor R6 and resistor R7 are connected in parallel and then connected to one end of inductor L10; one end of inductor L9 is connected in parallel with the other end of capacitor C14 and then connected to the other end of inductor L10; the other end of capacitor C14 is grounded; one end of inductor L3 is connected in parallel with one end of capacitor C13 and then connected to the other end of inductor L9; one end of capacitor C10 is connected in parallel with one end of inductor L2 and then connected to the other end of capacitor C13; the other end of inductor L2 is grounded; the other end of capacitor C10 is connected to RF_P pin; one end of capacitor C12 is connected in parallel with one end of capacitor C11 and then connected to the other end of inductor L3; the other end of capacitor C12 is grounded; the other end of capacitor C11 is connected to RF_N pin;

[0033] The crystal oscillator auxiliary circuit includes a clock crystal Y2, a crystal oscillator crystal Y1, a resistor R5, a capacitor C2, a capacitor C15, a capacitor C16, a capacitor C17 and a capacitor C18;

[0034] The crystal oscillator Y1 includes a crystal oscillator pin 1, a resonance pin 3, a ground pin 2, and a ground pin 4;

[0035] One end of the resistor R5 is connected to the RBLAS pin, and the other end is grounded;

[0036] One end of the capacitor C2 is connected to the DCOUPL pin, and the other end is grounded;

[0037] One end of the capacitor C15 is grounded, and the other end is connected in parallel to the crystal oscillator pin 1 of the crystal oscillator Y1 and then connected to the XOSSC32M_Q2 pin;

[0038] The ground pin 2 and the ground pin 4 of the crystal oscillator Y1 are grounded respectively;

[0039] One end of the capacitor C16 is grounded, and the other end is connected in parallel to the resonant pin 3 of the crystal oscillator Y1 and then connected to the XOSSC32M_Q1 pin;

[0040] One end of the capacitor C17 and one end of the capacitor C18 are grounded respectively; the other end of the capacitor C17 is connected in parallel with one end of the time crystal Y2 and then connected to the P23 pin; the other end of the capacitor C18 is connected in parallel with the other end of the time crystal Y2 and then connected to the P24 pin.

[0041] The present invention has the following advantages: The present invention provides a method for measuring the rotation speed of a cement slurry mixer, including a process for measuring the rotation speed of a revolution shaft, a process for measuring the relative rotation speed of a rotation shaft, and a process for calculating the rotation speed of a cement slurry mixer; the process for calculating the rotation speed of a cement slurry mixer includes: subtracting the measured rotation speed of the rotation shaft from the rotation speed of the revolution shaft to obtain the rotation speed of the cement slurry mixer. The present invention utilizes the principle of relative motion to obtain the rotation speed of the cement slurry mixer by subtracting the revolution speed of the revolution shaft from the rotation speed of the rotation shaft. The cement slurry mixer does not need to be disassembled to determine the reduction ratio of the gear mechanism, thereby eliminating the safety hazards caused by disassembling the equipment and improving the work efficiency. By directly measuring the actual rotation speed of the rotation shaft and the revolution speed of the revolution shaft, the rotation speed of the cement slurry mixer is calculated, so that the error change can be discovered in time, and the error caused by gear wear (i.e., the error between the theoretical conversion and the actual measured speed) is avoided, thereby improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0043] Figure 1 It is a structural schematic diagram of an existing cement slurry mixer in the background technology.

[0044] Figure 2 This is a schematic diagram of the structure of the rotation speed measuring device and the detected component installed in a cement slurry mixer according to the present invention.

[0045] Figure 3 The schematic diagram of the measuring method of the present invention.

[0046] Figure 4 The figure is a schematic diagram of the PCB structure of an embodiment of the rotation speed measuring device of the present invention.

[0047] Figure 5 FIG. 4 is a circuit diagram of an embodiment of the rotation speed measuring device of the present invention.

[0048] Figure 6 The figure is a schematic structural diagram of an embodiment of the rotation speed measuring device of the present invention.

[0049] Description of reference numerals:

[0050] 100. cement slurry mixer, 101. stirring blade, 102. rotation shaft, 103. revolution shaft, 104. mixer frame;

[0051] 200, a rotation speed measuring device, 201, a first housing, 202, a PCB circuit board, 203, a power supply, 204, a second housing;

[0052] 300, tested parts;

[0053] V 公转 , the revolution speed of the revolution axis;

[0054] V 自转 , Cement slurry mixer rotation speed;

[0055] V 相对自转 , the rotation speed of the stirring blade relative to the orbital axis. DETAILED DESCRIPTION

[0056] See also Figures 1 to 6 Attached Figure 3 In the embodiment, the revolution measurement module and the rotation measurement module are both the rotation speed measurement device 200. Figure 5 U3 is a magnetic resistance switch, the right end of resistor R7 is connected to the antenna, and BATTERY is the power supply.

[0057] Figure 6 In the embodiment, the main control chip, the speed sensor, the auxiliary circuit, and the wireless transmission module are integrated on a PCB circuit board 202, and the power supply 203 is located at the bottom of the PCB circuit 202. The two are electrically connected, and then the PCB circuit board 202 and the power supply 203 are packaged by a first shell 201 and a second shell 204.

[0058] The present invention provides a method for measuring the rotation speed of a cement slurry mixer, including a process for measuring the revolution speed of a revolution shaft 103, a process for measuring the relative rotation speed of a rotation shaft 102, and a process for calculating the rotation speed of the cement slurry mixer;

[0059] The cement slurry mixer rotation speed V 自转 The calculation process includes: the measured relative rotation speed V of the rotating shaft 102 相对自转 Subtract the revolution speed V of the revolution shaft 103 公转 , get the cement slurry mixer rotation speed V 自转 .

[0060] The present invention utilizes the principle of relative motion to obtain the self-rotation speed of the cement slurry mixer by subtracting the revolution speed of the revolution shaft 103 from the self-rotation speed of the rotation shaft 102. The cement slurry mixer does not need to be disassembled to determine the reduction ratio of the gear mechanism, thereby eliminating the potential safety hazards caused by disassembling the equipment and improving work efficiency. The self-rotation speed of the cement slurry mixer is calculated by directly measuring the actual self-rotation speed of the rotation shaft and the revolution speed of the revolution shaft, so that the error change can be discovered in time, and the error caused by gear wear (i.e., the error between the theoretical conversion and the actual measured speed) can be avoided, thereby improving the measurement accuracy.

[0061] The revolution speed V of the revolution shaft 103 公转The measurement process includes the following steps:

[0062] Step S11, fixing the detected component 300 on the revolution shaft 103;

[0063] Step S12, fix the speed measuring device 200 on the mixer frame 104, and adjust the position and angle of the speed measuring device 200 so that the detection part of the speed measuring device 200 is aligned with the detected part 300 on the revolution axis 103; in a specific implementation, if the detection part of the speed measuring device 200 adopts a grating sensor, the detected part 300 adopts a reflective sheet. If the detection part of the speed measuring device 200 adopts a high-frequency magnetic resistance switch, the detected part 300 adopts a magnetic sticker. Of course, in other embodiments, there can be other implementation methods. The speed measuring device 200 can adopt existing measuring equipment or be redeveloped and designed.

[0064] Step S13, start the cement slurry mixer 100 and the speed measuring device 200 to start working. When the cement slurry mixer 100 starts working, the speed measuring device 200 directly measures the revolution speed of the revolution shaft 103, and reads the revolution speed V after the speed stabilizes. 公转 and record the value.

[0065] The relative rotation speed V of the rotating shaft 102 相对自转 The measurement process includes the following steps:

[0066] Step S21, fixing the detected component 300 on the rotating shaft 102;

[0067] Step S22, fix the speed measuring device 200 on the eccentric seat of the revolution shaft 103, and align the detection part of the speed measuring device 200 with the detected part 300 on the rotation shaft 102; the present invention fixes the speed measuring device 200 on the revolution shaft 103 to realize the relative rotation speed V of the rotation shaft 102 相对自转 measurement.

[0068] Step S23, start the cement slurry mixer 100 and the speed measuring device 200 to start working. When the cement slurry mixer 100 starts working, the speed measuring device 300 rotates with the revolution shaft 103 and measures the relative rotation speed V of the rotation shaft 102. 相对自转 Start direct measurement; after the rotation speed stabilizes, read the rotation speed V of the rotating shaft 102 相对自转 and record the value.

[0069] The cement slurry mixer rotation speed V 自转 The calculation process is further as follows: the measured revolution speed V of the revolution shaft 103 is transmitted through the wireless transmission module. 公转and the relative rotation speed V of the rotating shaft 102 相对自转 The data is transmitted to the computer in the form of a digital signal, and the automated detection software on the computer receives the data; then the automated detection software converts the received relative rotation speed V of the rotating shaft 102 into 相对自转 Subtract the revolution speed V of the revolution shaft 103 公转 , get the cement slurry mixer rotation speed V 自转 , and form original records and reports, and finally store them in the database of the server. In a specific embodiment, the automatic detection software uses ZDJC-V1.0, and then the calculation formula is defined according to the above calculation principle.

[0070] The present invention also provides a rotation speed measuring device for a cement slurry mixer, comprising:

[0071] Main control chip;

[0072] A rotation speed sensor, the rotation speed sensor is connected to the main control chip;

[0073] Auxiliary circuit, the auxiliary circuit includes a power supply auxiliary circuit, a signal receiving and transmitting auxiliary circuit and a crystal oscillator auxiliary circuit; the crystal oscillator auxiliary circuit is connected to the main control chip;

[0074] A power supply, wherein the power supply, the power auxiliary circuit, and the main control chip are connected in sequence;

[0075] A wireless transmission module, the wireless transmission module is connected to the main control chip;

[0076] The antenna assembly, the signal receiving and transmitting auxiliary circuit, and the main control chip are connected in sequence.

[0077] In a specific implementation, a preferred embodiment is: the wireless transmission module is a Bluetooth module.

[0078] The main control chip and the wireless transmission module are integrated into one piece.

[0079] The rotation speed sensor is a high-frequency magnetic resistance switch.

[0080] The main control chip includes a DVDD pin, an AVDD_DREG pin, a DVDD_USB pin, a P20 pin, an AVDDS / AVDD_SOC pin, an AVDD1 pin, an AVDD2 pin, an AVDD3 pin, an AVDD4 pin, an AVDD_GUARD pin, an RF_P pin, an RF_N pin, a P23 pin, a P24 pin, an XOSSC32M_Q1 pin, an XOSSC32M_Q2 pin, a DCOUPL pin, an RBLAS pin and a GND pin; the GND pin is grounded;

[0081] The rotation speed sensor includes three pins, one of which is grounded, another is connected to the P20 pin, and the third is connected to the DVDD_USB pin;

[0082] The power auxiliary circuit includes an inductor L1, a capacitor C1, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8 and a capacitor C9; the positive electrode of the power supply is connected to one end of the inductor L1, and the other end of the inductor L1 is respectively connected to the DVDD pin, the AVDD_DREG pin, the AVDDS / AVDD_SOC pin, the AVDD1 pin, the AVDD2 pin, the AVDD3 pin and the AVDD4 pin; one end of the capacitor C1 is connected between the other end of the inductor L1 and the AVDD_DREG pin; one end of the capacitor C3 is connected between the other end of the inductor L1 and the DVDD pin; one end of the capacitor C4 is connected between the other end of the inductor L1 and the AVDDS / AVDD_SOC pin; one end of the capacitor C5 is connected between the other end of the inductor L1 and the AVDD3 pin; the AVDD1 pin, The AVDD2 pin and the AVDD4 pin are connected in parallel to one end of the capacitor C6, one end of the capacitor C8 and the other end of the inductor L1 respectively; one end of the capacitor C7 is connected between the other end of the inductor L1 and the AVDD_GUARD pin; one end of the capacitor C9 is connected to the other end of the inductor L1; the other ends of the capacitors C1, C3, C4, C5, C6, C7, C8 and C9 are grounded respectively;

[0083] The antenna assembly includes an external antenna base U2 and an antenna;

[0084] The signal receiving and transmitting auxiliary circuit includes an external antenna base U2, a resistor R7, a resistor R6, a capacitor C10, a capacitor C12, a capacitor C13, a capacitor C14, an inductor L2, an inductor L3, and an inductor L9. and inductor L10; one end of resistor R6 is connected to a contact of the external antenna base U2, the other contact of the external antenna base U2 is grounded, one end of resistor R7 is connected to the antenna, the other ends of resistor R6 and resistor R7 are connected in parallel and then connected to one end of inductor L10; one end of inductor L9 is connected in parallel with the other end of capacitor C14 and then connected to the other end of inductor L10; the other end of capacitor C14 is grounded; one end of inductor L3 is connected in parallel with one end of capacitor C13 and then connected to the other end of inductor L9; one end of capacitor C10 is connected in parallel with one end of inductor L2 and then connected to the other end of capacitor C13; the other end of inductor L2 is grounded; the other end of capacitor C10 is connected to RF_P pin; one end of capacitor C12 is connected in parallel with one end of capacitor C11 and then connected to the other end of inductor L3; the other end of capacitor C12 is grounded; the other end of capacitor C11 is connected to RF_N pin;

[0085] The crystal oscillator auxiliary circuit includes a clock crystal Y2, a crystal oscillator crystal Y1, a resistor R5, a capacitor C2, a capacitor C15, a capacitor C16, a capacitor C17 and a capacitor C18;

[0086] The crystal oscillator Y1 includes a crystal oscillator pin 1, a resonance pin 3, a ground pin 2, and a ground pin 4;

[0087] One end of the resistor R5 is connected to the RBLAS pin, and the other end is grounded;

[0088] One end of the capacitor C2 is connected to the DCOUPL pin, and the other end is grounded;

[0089] One end of the capacitor C15 is grounded, and the other end is connected in parallel to the crystal oscillator pin 1 of the crystal oscillator Y1 and then connected to the XOSSC32M_Q2 pin;

[0090] The ground pin 2 and the ground pin 4 of the crystal oscillator Y1 are grounded respectively;

[0091] One end of the capacitor C16 is grounded, and the other end is connected in parallel to the resonant pin 3 of the crystal oscillator Y1 and then connected to the XOSSC32M_Q1 pin;

[0092] One end of the capacitor C17 and one end of the capacitor C18 are grounded respectively; the other end of the capacitor C17 is connected in parallel with one end of the time crystal Y2 and then connected to the P23 pin; the other end of the capacitor C18 is connected in parallel with the other end of the time crystal Y2 and then connected to the P24 pin.

[0093] In a specific embodiment:

[0094] The speed measuring device 200 mainly includes: a speed sensor, a main control chip, a power supply, and an auxiliary circuit. The main control chip is composed of an ultra-low power sensor controller, a microcontroller (MCU), and a wireless transmission module (Bluetooth module). Each component is integrated on a circuit board and the microcontroller (MCU) program is secondary developed to realize the automatic collection, timing, and speed calculation of the revolution and rotation speed signals of the mixer. The wireless transmission module transmits the revolution speed and rotation speed data to the computer. The key to the development of the speed measuring device 200 lies in the selection, layout, circuit design, and secondary development of the microcontroller (MCU) program. The selection of components requires small size, light weight, and reasonable layout in a small space. The size (diameter*height) of the entire speed measuring device 200 is about φ25mm*5.5mm and the weight is about (20~40)g.

[0095] The circuit diagram of the rotation speed measuring device 200 is shown in FIG. Figure 5 As shown, the functions and selection of each component are as follows:

[0096] 1. The power supply uses a button battery, which is convenient and easy to purchase. The designed power circuit is responsible for converting the 3V power supply into a 3.3V working power supply and managing the power supply, including undervoltage, overload, short circuit alarm prompts, etc. The power supply can use a CR2302 button battery, the size (diameter * height) is about φ20mm*2mm, and the weight is about 3g.

[0097] 2. The speed sensor is responsible for converting the speed signal into a pulse signal and sending it to the speed signal acquisition module. It can use the low-power full-pole high-frequency magnetoresistive switch MR201. MR201 is an all-pole magnetic switch developed for high-sensitivity, high-speed, low-power, and high-precision applications that integrates tunnel magnetoresistive (TMR) sensors and CMOS technology. MR201 uses a high-precision push-pull half-bridge TMR magnetic sensor and CMOS integrated circuit, including a TMR voltage generator, a comparator, a Schmitt trigger, and a CMOS output circuit, which can convert the changing magnetic field signal into a digital voltage signal output. MR201 provides a temperature-compensated power supply through an internal voltage regulator and allows a wide operating voltage range.

[0098] The operating voltage of MR201 is 1.8-5.5V, the average power consumption is 5uA, the switching frequency is 100kHz, and the operating temperature is -40℃ to 125℃. It has the characteristics of low voltage operation, extremely high response frequency, microampere-level supply current, and wide operating temperature range. Its acquisition frequency can meet the technical requirements of (20~40000)r / min.

[0099] 3. The main control chip integrates ultra-low power sensor control, microcontroller (MCU), and Bluetooth module. The ultra-low power sensor control is responsible for level conversion, de-jittering, filtering, and direction identification of the collected speed pulse signal, and then sends it to the microcontroller (MCU) for speed calculation and processing. The microcontroller (MCU) data microprocessor is responsible for high-speed counting and precise timing of the speed pulse signal, and obtains the speed through precise timing and digital differential algorithms. The Bluetooth module is responsible for sending the speed signal calculated by the microprocessor to the computer wirelessly. The main control chip can use the Texas Instruments CC2640 series device as the main control chip, because CC2640 is a wireless microcontroller (MCU). It integrates Bluetooth and MCU together, has a small size, ultra-low power consumption, and is very suitable for battery-powered small control systems. CC2640 belongs to SimpleLink TM The CC2640 is an ultra-low power 2.4GHz RF device in the CC26xx series. It has extremely low active RF and MCU current and low power mode current consumption, which ensures excellent battery life and is suitable for small button battery powered applications. The SimpleLink Bluetooth low energy CC2640 device contains a 32-bit -M3 core (with the same operating frequency of the microcontroller (MCU) of 48MHz), and has a rich peripheral function set, including a unique ultra-low power sensor controller. This sensor controller is very suitable for connecting external sensors, and is also suitable for autonomously collecting analog and digital data when the rest of the system is in sleep mode. Its operating frequency can meet the technical requirements of (20-40000) r / min, and its size (length * width * height) is about φ16mm*11mm*2mm, and its weight is about 13g.

[0100] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A method for measuring the rotation speed of a cement slurry mixer. Features: It includes the process of measuring the revolution speed of the revolution shaft, the process of measuring the relative rotation speed of the rotation shaft, and the process of calculating the rotation speed of the cement slurry mixer; The calculation process of the self-rotation speed of the cement slurry mixer includes: subtracting the orbital speed of the orbital shaft from the measured self-rotation speed of the rotating shaft to obtain the self-rotation speed of the cement slurry mixer; The process of measuring the revolution speed of the revolution shaft comprises the following steps: Step S11, fixing the detected part on the revolution axis; Step S12, fixing the speed measuring device on the mixer frame, and adjusting the position and angle of the speed measuring device so that the detection part of the speed measuring device is aligned with the detected part on the revolution axis; Step S13, start the cement slurry mixer and the speed measuring device to start working. When the cement slurry mixer starts working, the speed measuring device starts to directly measure the revolution speed of the revolution shaft, and reads the revolution speed value after the speed stabilizes and records it; The relative rotation speed measurement process of the rotating shaft comprises the following steps: Step S21, fixing the detected part on the rotating shaft; Step S22, fixing the rotation speed measuring device on the eccentric seat of the revolution shaft, and aligning the detection part of the rotation speed measuring device with the detected part on the rotation shaft; Step S23, start the cement slurry mixer and the speed measuring device to start working. When the cement slurry mixer starts working, the speed measuring device rotates together with the revolution shaft and starts to directly measure the rotation speed of the rotation shaft; after the speed stabilizes, read the value of the rotation speed of the rotation shaft and record it; The detection part of the rotation speed measuring device adopts a high-frequency magnetic resistance switch, and the detected part adopts a magnetic sticker.

2. A method for measuring the rotation speed of a cement slurry mixer according to claim 1, Features: The calculation process of the rotation speed of the cement slurry mixer is further as follows: the measured revolution speed of the orbital shaft and the rotation speed of the rotation shaft are transmitted to the computer in the form of digital signals through the wireless transmission module, and the automatic detection software on the computer receives the data; then the automatic detection software subtracts the rotation speed of the rotation shaft from the received revolution speed of the orbital shaft to obtain the rotation speed of the cement slurry mixer, and forms original records and reports, which are finally stored in the database of the server.

3. A speed measuring device for the rotation speed of a cement slurry mixer, Features: Based on the method for measuring the rotation speed of a cement slurry mixer according to claim 1, the rotation speed measuring device is respectively fixed on the mixer frame and the eccentric seat of the revolution shaft, and the rotation speed measuring device includes: Main control chip; A rotation speed sensor, the rotation speed sensor is connected to the main control chip; Auxiliary circuit, the auxiliary circuit includes a power supply auxiliary circuit, a signal receiving and transmitting auxiliary circuit and a crystal oscillator auxiliary circuit; the crystal oscillator auxiliary circuit is connected to the main control chip; A power supply, wherein the power supply, the power auxiliary circuit, and the main control chip are connected in sequence; A wireless transmission module, the wireless transmission module is connected to the main control chip; The antenna assembly, the signal receiving and transmitting auxiliary circuit, and the main control chip are connected in sequence.

4. A rotation speed measuring device for a cement paste mixer according to claim 3, Features: The wireless transmission module is a Bluetooth module.

5. A rotation speed measuring device for a cement paste mixer according to claim 4, Features: The main control chip and the wireless transmission module are integrated into one piece.

6. A rotation speed measuring device for a cement paste mixer according to claim 5, Features: The main control chip includes a DVDD pin, an AVDD_DREG pin, a DVDD_USB pin, a P20 pin, an AVDDS / AVDD_SOC pin, an AVDD1 pin, an AVDD2 pin, an AVDD3 pin, an AVDD4 pin, an AVDD_GUARD pin, an RF_P pin, an RF_N pin, a P23 pin, a P24 pin, an XOSSC32M_Q1 pin, an XOSSC32M_Q2 pin, a DCOUPL pin, an RBLAS pin and a GND pin; the GND pin is grounded; The rotation speed sensor includes three pins, one of which is grounded, another is connected to the P20 pin, and the third is connected to the DVDD_USB pin; The power auxiliary circuit includes an inductor L1, a capacitor C1, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8 and a capacitor C9; the positive electrode of the power supply is connected to one end of the inductor L1, and the other end of the inductor L1 is respectively connected to the DVDD pin, the AVDD_DREG pin, the AVDDS / AVDD_SOC pin, the AVDD1 pin, the AVDD2 pin, the AVDD3 pin and the AVDD4 pin; one end of the capacitor C1 is connected between the other end of the inductor L1 and the AVDD_DREG pin; one end of the capacitor C3 is connected between the other end of the inductor L1 and the DVDD pin; the capacitor C4 One end of capacitor C5 is connected between the other end of inductor L1 and AVDDS / AVDD_SOC pin; one end of capacitor C5 is connected between the other end of inductor L1 and AVDD3 pin; AVDD1 pin, AVDD2 pin and AVDD4 pin are connected in parallel to capacitor C6, one end of capacitor C8 and the other end of inductor L1 respectively; one end of capacitor C7 is connected between the other end of inductor L1 and AVDD_GUARD pin; one end of capacitor C9 is connected to the other end of inductor L1; the other ends of capacitor C1, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8 and capacitor C9 are grounded respectively; The antenna assembly includes an external antenna base U2 and an antenna; The signal receiving and transmitting auxiliary circuit includes an external antenna base U2, a resistor R7, a resistor R6, a capacitor C10, a capacitor C12, a capacitor C13, a capacitor C14, an inductor L2, an inductor L3, an inductor L9 and an inductor L10; one end of the resistor R6 is connected to a contact of the external antenna base U2, the other contact of the external antenna base U2 is grounded, and one end of the resistor R7 is connected to the antenna; the other ends of the resistor R6 and the resistor R7 are connected in parallel and then connected to one end of the inductor L10; one end of the inductor L9 and the other end of the capacitor C14 are connected in parallel and then connected At the other end of the inductor L10; the other end of the capacitor C14 is grounded; one end of the inductor L3 and one end of the capacitor C13 are connected in parallel and then connected to the other end of the inductor L9; one end of the capacitor C10 and one end of the inductor L2 are connected in parallel and then connected to the other end of the capacitor C13; the other end of the inductor L2 is grounded; the other end of the capacitor C10 is connected to the RF_P pin; one end of the capacitor C12 and one end of the capacitor C11 are connected in parallel and then connected to the other end of the inductor L3; the other end of the capacitor C12 is grounded; the other end of the capacitor C11 is connected to the RF_N pin; The crystal oscillator auxiliary circuit includes a clock crystal Y2, a crystal oscillator crystal Y1, a resistor R5, a capacitor C2, a capacitor C15, a capacitor C16, a capacitor C17 and a capacitor C18; The crystal oscillator Y1 includes a crystal oscillator pin 1, a resonance pin 3, a ground pin 2, and a ground pin 4; One end of the resistor R5 is connected to the RBLAS pin, and the other end is grounded; One end of the capacitor C2 is connected to the DCOUPL pin, and the other end is grounded; One end of the capacitor C15 is grounded, and the other end is connected in parallel to the crystal oscillator pin 1 of the crystal oscillator Y1 and then connected to the XOSSC32M_Q2 pin; The ground pin 2 and the ground pin 4 of the crystal oscillator Y1 are grounded respectively; One end of the capacitor C16 is grounded, and the other end is connected in parallel to the resonant pin 3 of the crystal oscillator Y1 and then connected to the XOSSC32M_Q1 pin; One end of the capacitor C17 and one end of the capacitor C18 are grounded respectively; the other end of the capacitor C17 is connected in parallel with one end of the time crystal Y2 and then connected to the P23 pin; the other end of the capacitor C18 is connected in parallel with the other end of the time crystal Y2 and then connected to the P24 pin.

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