Automatic position searching type liquid level detector

Abstract

The utility model discloses an automatic position searching type liquid level detector. The automatic position searching type liquid level detector is connected with a detected standard volume tank in parallel through a liquid inlet and a liquid outlet; one end of the sensor fixing plate sleeves the outer side of the transparent glass tube, and the other end of the sensor fixing plate is provided with a ball nut which is matched with the ball screw; the upper end of the ball screw is connected with an output shaft of the driving motor; a belt pulley is arranged on an output shaft of the driving motor and is connected with a rotating shaft of the grating encoder through a belt; the upper end of the transparent glass tube is connected with the liquid outlet, and the lower end of the transparent glass tube is connected with the liquid inlet; the liquid level detection sensor is fixedly arranged on the sensor fixing frame and is connected with the control system; and the grating encoder is connected with the control system. The device has the advantages of high automation degree, accurate synchronous positioning, stable performance, small measurement error, good repeatability, safety and reliability in use and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of automatic positioning type liquid level detector realizes the detection method about the liquid level position in container, specifically for the measurement of liquid volume in standard volumetric tank, the standard volumetric quantity in tank is calculated by the measurement of liquid level position. BACKGROUND

[0002] Standard volumetric tank is the main equipment of volumetric liquid flow standard device, which has been widely used at home and abroad. The device applied to standard flow device generally uses two standard volumetric tanks, with a precision of 0.025%. The standard volume is generally (1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000) L.

[0003] At present, the volume value of the liquid in the standard volumetric tank is basically read by first reading the height value of the liquid level in the tank, and then calculating the specific volume value. The method of measuring the height of the liquid level is divided into contact type and non-contact type. The contact type is that the measuring device is in contact with the liquid. This method has errors in measurement because of contact with the liquid. It is acceptable in some places with low requirements, such as water pools and water storage tanks. However, as a standard source for measurement, the requirements are high. Obviously, the contact method is not suitable, so the non-contact method is used to detect the height of the liquid level. At present, the non-contact range finder on the market includes ultrasonic, laser, photoelectric, etc. These methods have high precision or requirements for use. For example, ultrasonic and laser have low precision, and photoelectricity requires the transparency of the liquid. If the liquid is not clear, it will affect the measurement and cause consequences to the measurement accuracy and normal operation of the equipment. SUMMARY

[0004] To solve the problems in the prior art, the utility model provides an automatic positioning type liquid level detector. The automatic positioning type liquid level detector is connected in parallel with the measured standard volumetric tank through an interface, and the liquid is introduced into the instrument. The internal sensor and related structure cooperate to automatically find the liquid level position. The recording unit records the distance moved, and the liquid volume value in the standard volumetric tank is calculated by the distance.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] An automatic positioning liquid level detector, the liquid inlet and the liquid outlet are connected with the measured standard volume tank in parallel; one end of the sensor fixing plate is sleeved outside the transparent glass tube, and the other end is provided with a ball nut, the ball nut is matched with a ball screw; the upper end of the ball screw is connected with the output shaft of the driving motor; a belt pulley is arranged on the output shaft of the driving motor, and the belt pulley is connected with the rotating shaft of the grating encoder through a belt; the upper end of the transparent glass tube is connected with the liquid outlet, and the lower end of the transparent glass tube is connected with the liquid inlet; the liquid level detection sensor is fixedly installed on the sensor fixing frame and connected with the control system; the grating encoder is connected with the control system.

[0007] The control system is arranged in the display table head.

[0008] The driving motor and the speed reducer form a driving system, which improves the load force and meets the requirements of starting and stopping, ensures that the liquid level detector is quickly and accurately stopped at the liquid level position, and improves the measurement accuracy.

[0009] The utility model discloses a liquid level recognition sensor, displacement measurement sensor, moving mechanism, driving motor, liquid guide pipeline, acquisition control system etc. Liquid is introduced into the detector inside through the guide pipeline, and the movement of the moving mechanism is driven by the driving motor, and the liquid level recognition sensor is fixed on the moving mechanism, when the liquid level recognition sensor recognizes the liquid level, the signal is transmitted to the control system, and the system controls the running state of the relevant mechanism, and the value of the displacement measurement sensor is read out, and the liquid level height at the time is calculated through the value.

[0010] The photoelectric encoder is used as the recording element of the moving distance, the element is fixed on the support, is connected with the driving motor through the connecting belt, is driven by the driving motor, and is rotated to emit AB phase pulse, and the pulse signal is recorded by the acquisition control system, and the displacement or volume value can be calculated through the value.

[0011] The utility model discloses the stroke of measurement can be determined according to the size of the measured volume tank, and the general standard volume tank has the specification of (1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000) L.

[0012] The measurement resolution is 100P / mm, the measurement error is ±1P, and for the detector with a stroke of 200mm, the measurement accuracy is 0.005%, which meets the measurement requirement.

[0013] The utility model discloses the stroke of measurement can be determined according to the size of the measured volume tank, and the general standard volume tank has the specification of (1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000) L.

[0014] 1. The utility model discloses a wide application in the measurement of various volume tank liquid level, the measurement of various standard volume tank liquid volume. The final several can be seen directly in the local, also can be uploaded to the computer remote display.

[0015] 2. The utility model discloses a measuring precision is high 0.005%, and work is stable, and the function is strong, and there is certain function extension space, simple structure etc.

[0016] 3. The utility model discloses an alarm output function, and the position of alarm liquid level is settable change, and provides the guarantee for the safe operation of whole system.

[0017] 4. The utility model discloses a medium liquid does not have harsh requirement, just can flow.

[0018] 5. The utility model discloses long -time use work stability, is not restricted by the transparency of transparent glass tube.

[0019] 6. The utility model discloses the reliability of sealing, adopts fluorine rubber O ring sealing entirely, ensures 0 leakage.

[0020] 7. The utility model discloses quick chuck is used as the connecting interface, can quickly dismount and ensure no leakage. DRAWINGS

[0021] Figure 1 It is automatic location type liquid level detector structure schematic view for the utility model.

[0022] In the drawing, 1 is display table head, 2 is grating encoder, 3 is drive motor, 4 is connecting belt, 5 is ball screw, 6 is transparent glass tube, 7 is liquid level detection sensor 2018HL, 8 is sensor fixed plate, 9 is ball nut, 10 is liquid discharge port, 11 is liquid inlet, and the measured standard volume tank. SPECIFIC IMPLEMENTATION

[0023] The utility model will be further described below in conjunction with the drawings of specification.

[0024] Through liquid inlet and liquid discharge port and measured standard volume tank 12 are connected in parallel together;Sensor fixed plate 8 one end is sleeved on the outside of transparent glass tube 6, and the other end sets ball nut 9, and the ball nut 9 is cooperated with ball screw 5;The upper end of ball screw 5 is connected with the output shaft of drive motor 3;Drive motor 3's output shaft sets up pulley, and the pulley is connected with the pivot of grating encoder through belt 4;The upper end of transparent glass tube 6 is connected with liquid discharge port 10, and the lower end of transparent glass tube 6 is connected with liquid inlet 11;Liquid level detection sensor 7 is fixedly installed on sensor fixed frame 8 and is connected with control system;Grating encoder 2 is connected with control system;Control system is set in display table head 1.

[0025] Liquid enters through inlet joint 9, and then flows out from outlet joint after passing through transparent glass tube.

[0026] The utility model principle is as follows:

[0027] The utility model discloses adopt liquid level detection sensor 7 to seek liquid level position, through the operation of moving mechanism 5 and drive motor 2, drive liquid level detection sensor 7 seek liquid level position, while seeking liquid level position, by grating encoder 3 send AB phase pulse to the collection control system, then by collection control system real-time record, control the operation state of moving mechanism 5 and drive motor 2 simultaneously, until stop after finding liquid level position.

[0028] The utility model discloses collection control system is installed in display table head 1, and the computer is connected with automatic positioner liquid level detector through RS485 mode. All data in automatic positioner liquid level detector are shared with computer through RS485 communication mode and realize data transmission, and the computer controls action through the quantity of detector upload. After system starts, the data of detector upload are shown in real time through man-machine interface, so that the operator is clear at a glance, analysis and calculation to the operation state of volumetric tank, and the accurate volumetric value is obtained automatically.

[0029] The main technical indexes of the utility model are as follows:

[0030] 1. Test range: (100~1000) mm

[0031] 2. Measurement inaccuracy: 0.005%.

[0032] 3. Alarm output position: (100~1000) mm can be set.

[0033] 4. Signal output mode: open drain output, current <100mA.

[0034] 5. Communication mode: RS485.

[0035] 6. Use environment: temperature 40 DEG C, pressure normal pressure, relative humidity (15~90) %RH.

Claims

1. An automatic homing liquid level detector, characterized by: The liquid inlet and the liquid outlet are connected with the standard volume tank in parallel; one end of the sensor fixing plate is sleeved outside the transparent glass tube, and the other end is provided with a ball nut which is matched with a ball screw; the upper end of the ball screw is connected with the output shaft of the driving motor; a belt pulley is arranged on the output shaft of the driving motor and connected with the rotating shaft of the grating encoder through a belt; the upper end of the transparent glass tube is connected with the liquid outlet, and the lower end of the transparent glass tube is connected with the liquid inlet; the liquid level detection sensor is fixedly installed on the sensor fixing frame and connected with the control system; the grating encoder is connected with the control system.

2. The self-homing liquid level detector of claim 1, wherein: The control system is arranged in the display table head.

3. The self-homing liquid level detector of claim 1, wherein: The driving motor and the speed reducer constitute a driving system, which improves the load force and meets the requirements of starting and stopping at any time, ensures quick and accurate stopping at the liquid level position and improves the measurement accuracy.

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