CN215026289U

CN215026289U - A measurement system for be used for mud scraper instant operation load

Info

Publication number: CN215026289U
Application number: CN202120694801.8U
Authority: CN
Inventors: 郭霖; 李鹏军; 蒋超; 柯仲皓
Original assignee: Zhejiang Weiming Environmental Technology Co ltd
Current assignee: Zhejiang Weiming Environmental Technology Co ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2021-12-07
Anticipated expiration: 2031-04-06

Abstract

The utility model provides a measurement system for be used for mud scraper instant operation load, including direct current low voltage motor, mud scraper main shaft and motor current monitoring devices, direct current low voltage motor with the mud scraper main shaft is connected, motor current monitoring devices with direct current low voltage motor connects. The measuring system feeds back the instant running load of the mud scraper by monitoring the current value of the direct-current low-voltage motor, the voltage value of the motor adopted by the measuring system is small, and compared with the motor with the same power, the current value generated by the direct-current low-voltage motor adopted by the measuring system is large, and the instant running load of the mud scraper can be reflected.

Description

A measurement system for be used for mud scraper instant operation load

Technical Field

The utility model belongs to the technical field of mud scraper load monitoring, especially, relate to a measurement system for mud scraper instantaneous operation load.

Background

The sedimentation tank is a traditional process facility in wastewater treatment, and is commonly used as a vertical flow sedimentation tank, a radial flow sedimentation tank, a high-density sedimentation tank and the like. In order to ensure that sludge in the tank is not hardened and bridged and can be smoothly discharged by a sludge pump, a sedimentation tank is generally provided with a mud scraper, and the main components of the mud scraper mainly comprise a motor, a reduction gearbox, a rack, a main shaft, a mud scraping arm, a mud scraping plate, a pull rod, a bottom support seat and the like. The cycloidal pin wheel reduction box is driven by a motor, a main shaft is driven by a coupler to drive a mud scraper at the bottom of a pool to rotate continuously, the motor of the mud scraper is 0.75Kw/380V, the rotating speed of the mud scraper is 0.08-0.1rpm, the torque amplification factor is 18585 times, theoretically, the maximum output torque of the motor is 0.75 multiplied by 9550 divided by 1430=5N ∙ m, the maximum output torque of the main shaft is 0.75 multiplied by 9550 divided by 0.1=71625N ∙ m, and a manufacturer calculates the actual operating dynamic torque to be less than 10000N ∙ m. Because the power of the motor is 0.75Kw, the voltage is 380V, the actual running current is relatively small, the relevance with the load of the mud scraper is not strong, the current is not sensitive, and the instant running load of the mud scraper cannot be reflected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the technical problem and providing a measuring system for mud scraper instant operation load.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a measurement system for be used for mud scraper instant operation load, includes direct current low voltage motor, mud scraper main shaft and motor current monitoring devices, direct current low voltage motor with mud scraper main shaft is connected, motor current monitoring devices with direct current low voltage motor is connected.

Preferably, the model of the direct-current low-voltage motor is D80M-02430B 5-E.

Preferably, the measuring system further comprises a vertical support, a reduction gearbox, a first coupling, a rotating speed torque sensor and a second coupling, the direct-current low-voltage motor is connected with the reduction gearbox, an output shaft of the reduction gearbox, the first coupling, the rotating speed torque sensor, the second coupling and a mud scraper main shaft are sequentially connected from top to bottom, a power equipment mounting seat used for supporting the direct-current low-voltage motor and the reduction gearbox is arranged at the bottom end of the direct-current low-voltage motor and the reduction gearbox, the power equipment mounting seat is fixedly arranged on the vertical support, the rotating speed torque sensor is fixedly connected with the rotating speed torque sensor mounting seat, and the rotating speed torque sensor mounting seat is fixedly arranged on the vertical support.

Preferably, the motor current monitoring device comprises a control unit, a motor driving circuit and a current monitoring circuit, wherein the control unit is electrically connected with the motor driving circuit and the current monitoring circuit respectively, and the current monitoring circuit comprises a current detection amplifier.

After the technical scheme is adopted, the utility model has the advantages of as follows:

the measuring system feeds back the instant running load of the mud scraper by monitoring the current value of the direct-current low-voltage motor, the voltage value of the motor adopted by the measuring system is small, and compared with the motor with the same power, the current value generated by the direct-current low-voltage motor adopted by the measuring system is large, and the instant running load of the mud scraper can be reflected.

Drawings

Fig. 1 is a schematic view of a connection structure of a measuring system for an instant operation load of a mud scraper according to the present invention;

fig. 2 is a schematic mechanical structure diagram of a system for measuring the instant operation load of the mud scraper of the present invention;

FIG. 3 is a circuit diagram of a motor drive circuit;

FIG. 4 is a circuit diagram of a current monitoring circuit;

in the figure:

1-a vertical support; 2-a direct current low voltage motor; 3-a first coupling; 4-rotational speed torque sensor; 5-a second coupling; 6-main shaft of mud scraper; 7-a power equipment mounting base; 8-a rotational speed torque sensor mounting seat; 10-reduction box.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-2, a system for measuring the immediate operation load of a mud scraper comprises a dc low-voltage motor 2, a main shaft 6 of the mud scraper, and a motor current monitoring device, wherein the dc low-voltage motor 2 is connected with the main shaft 6 of the mud scraper, and the motor current monitoring device is connected with the dc low-voltage motor 2.

The model of the direct-current low-voltage motor 2 is D80M-02430B 5-E. The rated power of the direct current low-voltage motor 2 is 0.75kw, and the rated voltage is 48V.

The measuring system further comprises a vertical support 1, a reduction gearbox 10, a first coupling 3, a rotating speed and torque sensor 4 and a second coupling 5. The direct-current low-voltage motor 2 is connected with the reduction gearbox 10, and an output shaft of the reduction gearbox 10, the first coupling 3, the rotating speed torque sensor 5, the second coupling 6 and the mud scraper main shaft 6 are sequentially connected from top to bottom. The bottom ends of the direct-current low-voltage motor 2 and the reduction gearbox 10 are provided with power equipment mounting seats 7 used for supporting the direct-current low-voltage motor 2 and the reduction gearbox 10, the power equipment mounting seats 7 are fixedly arranged on the vertical support 1, the rotating speed and torque sensor 4 is fixedly connected with a rotating speed and torque sensor mounting seat 8, and the rotating speed and torque sensor mounting seat 8 is fixedly arranged on the vertical support 1.

The motor current monitoring device comprises a control unit, a motor driving circuit and a current monitoring circuit, wherein the control unit is respectively electrically connected with the motor driving circuit and the current monitoring circuit, and the current monitoring circuit comprises a current detection amplifier.

With the improvement of the control precision of the direct current motor, the current detection of the direct current motor becomes an important factor for controlling the double closed loops and detecting the working state of the motor. At present, the popular current detection methods include three types, namely power tube detection, parallel current mirror detection and series resistance detection. The power tube detection is greatly influenced by temperature, the parallel current mirror detection circuit is complex, the response time is slow, the accuracy of series resistance detection is high, and the circuit is simple. The design adopts the ultra-accurate LTC6102 current detection amplifier to reduce the error to milliampere level, and simultaneously reduces the detection resistance and the power consumption.

The motor current monitoring device adopts 32-bit single chip machine MK60DN512 of Shekel K60 series as a core controller, K60 has abundant peripheral equipment, the main frequency can reach 100Mhz, a FTM module of K60 is used for generating PWM pulse of 20KHZ, and a 16-bit ADC module of K60 is used for collecting voltage amplified by a sampling resistor for improving precision. And calculating the collected voltage to obtain the current.

As shown in fig. 3, the motor driving circuit is designed by using an N-channel MOSFET and a dedicated gate driving chip, the N-channel MOSFET is an IRLR7843 packaged by an IR company TO-252, the IRLR7843 has an extremely low on resistance RDS =3.3m Ω, a withstand voltage value can reach 30V, a current can reach 161A, and an H-bridge driving circuit can be formed by using four IRLRs 7843, so that forward and reverse rotation of the motor is realized. The IR2104 of the IR company is selected as the special gate driving chip, the IR2104 gate driving circuit can improve the switching speed of the MOSFET, has the functions of preventing the conduction of the same arm, preventing the hardware dead zone, protecting the undervoltage and the like, and can improve the reliability of the circuit operation.

Vat is the battery voltage, the selectable range is 6V-24V, the minimum value of the bootstrap capacitors C2 and C3 is calculated according to parameters such as a field effect tube, a gate drive chip and the selected bootstrap capacitor, and in order to reduce the bootstrap voltage loss, the equivalent series resistance of the bootstrap capacitor should be as small as possible and not less than 0.47 mu F. In order to reduce the charge loss, the bootstrap diodes D1 and D2 should be fast recovery diodes with small reverse leakage current.

When the PWM1 is high and the PWM2 is low, Q1 and Q4 are turned on, Q2 and Q3 are turned off, and the motor rotates forward. When the PWM1 is low and the PWM2 is high, Q2 and Q3 are turned on, Q1 and Q4 are turned off, and the motor is rotated in reverse.

As shown in fig. 4, LTC6201 of the current monitoring circuit is a high-voltage side current detection amplifier, which greatly improves the dynamic range of current detection, and can maintain high sampling precision under the condition of a very small sampling resistor Rsense. The accuracy of the current sense amplifier is mainly determined by the input offset voltage Vos, which can also achieve a resolution of 3mA with a sampling resistance of 1m Ω.

INS is an inverting detection input, INF is an inverting feedback connection, IN is an IN-phase detection input, V + is a power supply positive electrode input, V-is a power supply negative electrode input, VRGE is an internal voltage-stabilized power supply pin, a 0.1 mu F capacitor needs to be connected with V +, OUT is an open leakage current output pin, current can be converted into voltage proportional to the voltage of a sampling resistor through the outside, and then the voltage is collected by an ADC (analog to digital converter) of K60, so that the current passing through the sampling resistor is calculated.

When the motor rotates forwards, the voltage difference between two sides of the sampling resistor R5 is amplified by LTC6102, and is collected by the ADC module of K60, and the sampling current is obtained after processing. K60 is powered by 3.3V, so the maximum acquisition voltage of the ADC is 3.3V, and the maximum acquisition value is recorded as the maximum value related to the acquisition accuracy, e.g., the maximum value of the 16-bit acquisition accuracy is the maximum value Nmax of the 16-bit unsigned shaping.

In addition to the preferred embodiments described above, other embodiments of the present invention are also possible, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which should fall within the scope of the present invention defined by the appended claims.

Claims

1. The utility model provides a measurement system for be used for mud scraper instant operation load, its characterized in that, includes direct current low voltage motor (2), mud scraper main shaft (6) and motor current monitoring devices, direct current low voltage motor (2) with mud scraper main shaft (6) are connected, motor current monitoring devices with direct current low voltage motor (2) are connected.

2. The system for measuring the instantaneous running load of a mud scraper as claimed in claim 1, characterized in that said direct current low voltage motor (2) is of type D80M-02430B 5-E.

3. The system for measuring the instant operation load of the mud scraper as claimed in claim 1, wherein the system further comprises a vertical support (1), a reduction gearbox (10), a first coupling (3), a rotational speed torque sensor (4) and a second coupling (5), the DC low voltage motor (2) is connected with the reduction gearbox (10), the output shaft of the reduction gearbox (10), the first coupling (3), the rotational speed torque sensor (4), the second coupling (5) and the main shaft (6) of the mud scraper are sequentially connected from top to bottom, the bottom ends of the DC low voltage motor (2) and the reduction gearbox (10) are provided with a power equipment mounting seat (7) for supporting the DC low voltage motor (2) and the reduction gearbox (10), the power equipment mounting seat (7) is fixedly arranged on the vertical support (1), the rotational speed torque sensor (4) is fixedly connected with a rotational speed torque sensor mounting seat (8), the rotating speed and torque sensor mounting seat (8) is fixedly arranged on the vertical support (1).

4. The system for measuring the instantaneous operating load of a mud scraper as claimed in claim 1, wherein said motor current monitoring device comprises a control unit, a motor driving circuit and a current monitoring circuit, said control unit is electrically connected to said motor driving circuit and said current monitoring circuit respectively, and said current monitoring circuit comprises a current detection amplifier.