CN207180794U - Flowmeter high-resolution based on twin shaft magnetic degree sensor counts conversion equipment - Google Patents

Abstract

The utility model relates to a flowmeter high-resolution counting conversion device based on a biaxial magnetic angle sensor. It is characterized in that it includes a counting frame, a counter, a driving gear, an annular magnetic steel and a double-axis magnetic angle sensor. A magnetic angle acquisition board is arranged on the front of the gear, the magnetic angle acquisition board is arranged on the counting frame, the double-axis magnetic angle sensor is arranged on the magnetic angle acquisition board, the double-axis magnetic angle sensor is facing the ring magnet and the double-axis magnetic angle sensor The magnetic steel is arranged in parallel. The utility model can improve the resolution of real-time collection, and at the same time, the device can synchronously position the digits of the character wheel, has the characteristics of strong anti-magnetic interference, low cost and simple structure, and is especially suitable for the pair of cut-off membrane flowmeters. Acquisition requirements for small flows.

Description

Flow meter high-resolution counting conversion device based on dual-axis magnetic angle sensor

technical field

The utility model relates to a flowmeter high-resolution counting conversion device based on a biaxial magnetic angle sensor.

Background technique

A large number of cut-off flowmeters currently in use on the market usually read the count value of the word wheel of the meter counter through electromechanical transformation of the meter counter. The common methods are: (1) Add a magnetic steel to the second round of the counter, use a dry yellow tube or a magnetic switch to count, and the counting resolution is the third round unit indication value; (2) Transform the second round to the eighth round The character wheel uses photoelectric principle for direct reading; (3) uses image direct reading to identify the second to eighth rounds. The above methods (2) and (3) generally avoid the head wheel, because the head wheel will be at any angle when it is stationary, and the value on the character wheel will generally not be in the positive display position, while the other character wheels will be in the center of the display when they are stationary, which is convenient for photoelectricity. or image processing. The above three methods can only reach the highest resolution of the counter’s second-digit indication unit value. For example, the last digit of the general civilian flowmeter counter’s indication value is 0.001 square meters, while the above methods can only reach 0.01 square meters at most. In fact, most manufacturers The resolution of smart meter reading is generally 0.1 square meters. For the abnormal situation of continuous small flow leakage of gas, the above structure cannot meet the collection requirements.

Utility model content

Aiming at the problems existing in the prior art, the purpose of the utility model is to provide a technical solution of a flowmeter high-resolution counting conversion device based on a biaxial magnetic angle sensor.

The high-resolution counting conversion device of the flow meter based on the biaxial magnetic angle sensor is characterized in that it includes a counting frame, a counter, a driving gear, a ring magnet and a biaxial magnetic angle sensor, and the counter and the driving gear are arranged on the counting frame On the top, the driving gear drives the head wheel of the counter, the driving gear is equipped with a ring-shaped magnetic steel, the front of the driving gear is equipped with a magnetic angle acquisition board, the magnetic angle acquisition board is set on the counting frame, and the double-axis magnetic angle sensor is set on the magnetic angle acquisition board , the biaxial magnetic angle sensor is facing the ring magnet and the biaxial magnetic angle sensor is arranged in parallel with the ring magnet.

The high-resolution counting conversion device for flow meters based on the biaxial magnetic angle sensor is characterized in that the biaxial magnetic angle sensor is connected with an AD acquisition circuit, and the AD acquisition circuit is arranged on the display control circuit board.

The high-resolution counting conversion device of the flow meter based on the biaxial magnetic angle sensor is characterized in that the positions of 0 degrees in the X direction and 90 degrees in the Y direction of the biaxial magnetic angle sensor correspond to the positive polarity direction of the ring magnet, and the fixed position Corresponding to the initial scale of the number 0 on the head wheel, the 0 to 360 degrees collected by the dual-axis magnetic angle sensor correspond to the position of the number 0 to 9 on the head wheel.

In the utility model, an annular magnetic steel is arranged on the driving gear, a magnetic angle acquisition plate is arranged on the front of the driving gear, and a double-axis magnetic angle sensor is arranged on the magnetic angle acquisition plate. The sensor is set in parallel with the annular magnetic steel, and the signal output by the dual-axis magnetic angle sensor is connected to the display control circuit board, and is collected using the AD acquisition circuit. Since the starting positions of the X and Y axes of the dual-axis magnetic angle sensor measured on the structural placement have been Align with the '0' scale on the head wheel of the counter, and collect 0 to 360 degrees, which is equivalent to the position of the number 0 to 9 of the word wheel, so as long as the sampling period is less than the fastest time for one revolution of the gear, the current scale can be directly converted According to the rotation angle collected by the dual-axis magnetic angle sensor, the current display position of the character wheel can be subdivided, which can enhance the safety guarantee ability of the cut-off flow meter when the continuous small flow leaks.

The utility model can improve the resolution of real-time collection, and at the same time, the device can synchronously locate the numbers of the character wheel, has the characteristics of strong anti-magnetic interference, low cost and simple structure, and is especially suitable for the pairing of cut-off membrane gas meters. Acquisition requirements for small flows.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Figure 2 is a schematic diagram of the installation of the ring magnet;

In the figure: 1-counting frame, 2-counter, 3-driving gear, 4-ring magnet, 5-head wheel, 6-magnetic angle acquisition board.

Detailed ways

Below in conjunction with accompanying drawing of description, the utility model is further described:

A flowmeter high-resolution counting conversion device based on a dual-axis magnetic angle sensor, including a counting frame 1, a counter 2, a driving gear 3, a ring magnet 4 and a dual-axis magnetic angle sensor, and the counter 2 and the driving gear 3 are set on the counting frame 1, the drive gear 3 drives the head wheel 5 of the counter, the drive gear 3 is provided with an annular magnetic steel 4, and the drive gear that drives the counter head wheel is used as the measuring gear, and a magnetic angle acquisition plate 6 is arranged on the front of the drive gear to collect the magnetic angle. The plate is arranged on the counting frame, and the biaxial magnetic angle sensor is arranged on the magnetic angle acquisition board 6, the biaxial magnetic angle sensor is facing the ring magnet and the biaxial magnetic angle sensor is arranged in parallel with the ring magnet, and can be connected in a non-contact manner. Ring magnet for angle measurement.

The dual-axis magnetic angle sensor adopts TMR3002. The positions of 0 degrees in the X direction and 90 degrees in the Y direction of the dual-axis magnetic angle sensor correspond to the positive polarity direction of the ring magnet. The fixed position corresponds to the initial scale of the number 0 on the head wheel. The dual-axis magnetic angle The 0 to 360 degrees collected by the sensor correspond to the positions of the numbers 0 to 9 on the head wheel. The dual-axis magnetic angle sensor is also connected with an AD acquisition circuit, and the AD acquisition circuit is arranged on the display control circuit board. The display control circuit board is the basic composition of each flow meter, so I won't repeat it here.

The principle of the collection method of this scheme is as follows: when the factory is set, the accumulated display of the liquid crystal is set to be the same as that of the mechanical counter. The dual-axis magnetic angle sensor near the ring magnet can collect the change angle of the ring magnet on its rotation plane on the X and Y axes. The change angle is the rotation angle of the current character wheel relative to the position of the '0' character.

Embodiment: As shown in Figure 1, it is a view of the counter, wherein the driving gear is a gear that directly drives the head wheel, and a ring-shaped magnetic steel (as shown in Figure 2 ) is set on the driving gear or its rotating shaft, and the dual-axis magnetic angle sensor is close to the ring Magnetic steel, the double-axis magnetic angle sensor is fixed on the counting frame through the magnetic angle acquisition board, the signal output by the double-axis magnetic angle sensor is connected to the display control circuit board, and is collected by AD acquisition circuit, the double-axis magnetic angle sensor can choose TMR3002 , the sensor has low power consumption to meet the needs of use.

Since the starting positions of the X and Y axes of the dual-axis magnetic angle sensor measured on the structural placement have been aligned with the '0' scale on the counter head wheel, the collected 0 to 360 degrees are equivalent to the positions of the numbers 0 to 9 on the word wheel, so As long as the sampling period is less than the fastest time for one revolution of the gear, the current scale position can be directly converted without losing the metering data. Since the rotation speed of the head wheel will not exceed 41 revolutions per minute, it will not exceed 1 revolution in 1 second, so AD acquisition The interval can be set to 1 second, which greatly reduces power consumption.

According to the rotation angle collected by the dual-axis magnetic angle sensor, the current display position of the character wheel can be subdivided. If 10-level subdivision is used, the resolution can reach 0.001 square for the counter with 0.001 square display. If 20-level fine-grained points, and the resolution can reach 0.0005 square meters, which can be selected according to requirements.

The resolution of this solution is determined by the dual-axis magnetic angle sensor and AD resolution, but these two items are far greater than the subdivision accuracy of 2%. Therefore, for a counter with 0.001 square meters, the counting resolution can be higher than 0.001 square meters, and the real-time accuracy is determined by The linearity of the dual-axis magnetic angle sensor, the accuracy of the ring magnet and the installation position of the dual-axis magnetic angle sensor is determined by the overall accuracy of better than 0.002 square meters.

Claims (3)

1. The flowmeter high-resolution counting conversion device based on the dual-axis magnetic angle sensor is characterized in that it includes a counting frame, a counter, a driving gear, a ring magnet and a dual-axis magnetic angle sensor, and the counter and the driving gear are arranged on the counting frame , the driving gear drives the head wheel of the counter, the driving gear is provided with annular magnetic steel, the front of the driving gear is provided with a magnetic angle acquisition board, the magnetic angle acquisition board is arranged on the counting frame, and the biaxial magnetic angle sensor is arranged on the magnetic angle acquisition board, The biaxial magnetic angle sensor is facing the ring magnetic steel, and the biaxial magnetic angle sensor is arranged in parallel with the ring magnetic steel. 2. the flow meter high-resolution count conversion device based on the dual-axis magnetic angle sensor according to claim 1, wherein the dual-axis magnetic angle sensor is connected with an AD acquisition circuit, and the AD acquisition circuit is arranged on the display control circuit board. 3. The flowmeter high-resolution counting conversion device based on a biaxial magnetic angle sensor according to claim 1, wherein the biaxial magnetic angle sensor is located at 0 degrees in the X direction and 90 degrees in the Y direction corresponding to the positive pole of the ring magnet The position corresponds to the initial scale of the number 0 on the head wheel, and the 0 to 360 degrees collected by the dual-axis magnetic angle sensor corresponds to the position of the number 0 to 9 on the head wheel.