CN116182989A - Light reflection measuring scale, liquid level detection device and system - Google Patents

Light reflection measuring scale, liquid level detection device and system Download PDF

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Publication number
CN116182989A
CN116182989A CN202310215005.5A CN202310215005A CN116182989A CN 116182989 A CN116182989 A CN 116182989A CN 202310215005 A CN202310215005 A CN 202310215005A CN 116182989 A CN116182989 A CN 116182989A
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CN
China
Prior art keywords
liquid level
cup
detection
cup body
light reflection
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CN202310215005.5A
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Chinese (zh)
Inventor
喻骏
南永涛
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Shanghai Yilexi Technology Co ltd
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Shanghai Yilexi Technology Co ltd
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Priority to CN202310215005.5A priority Critical patent/CN116182989A/en
Publication of CN116182989A publication Critical patent/CN116182989A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

The embodiment of the invention provides a light reflection measuring tape, a liquid level detection device and a system, and relates to the technical field of cup liquid level detection. The light reflection measuring tape comprises a sensing detection circuit board and a plurality of detection sensors arranged on the sensing detection circuit board, wherein the detection sensors are uniformly arranged on the sensing detection circuit board along a preset direction. When measuring the liquid level position of the cup to be measured, a plurality of detection sensors arranged along a preset direction are placed in parallel with the cup. The detection sensor emits light towards the cup body to be detected, and detects the light intensity value of the reflected light. According to the invention, the detection sensor which is in non-contact with the cup body to be detected emits light towards the cup body to be detected and detects the received reflected light, so that the non-contact liquid level position detection of the cup body to be detected is realized, the pollution to the liquid in the cup body to be detected is avoided, the liquid level detection can be rapidly and continuously carried out, the working efficiency is improved, and the working time is saved.

Description

Light reflection measuring scale, liquid level detection device and system
Technical Field
The invention relates to the technical field of cup body fluid level detection, in particular to a light reflection measuring tape, a fluid level detection device and a system.
Background
In the detection of medical in-vitro diagnostic instruments, an array cup holder is arranged, and is typically square and disc, and in the operation process of the instruments, the liquid level positions of a sample cup, a reagent cup, a reaction cup and the like are required to be detected, so that the downward detection height of a liquid taking needle is determined, and the liquid taking needle can generally penetrate into a shallower distance of the liquid level, so that the subsequent cleaning effect of the liquid taking needle is facilitated. In order to realize liquid level detection, a typical method is to adopt a capacitance value liquid level detection unit to be connected with the rear end of a liquid taking needle, and identify the position of the liquid level through the change of the capacitance value when the liquid taking needle head touches the liquid level.
The existing capacitance liquid level detection unit is interfered by environmental factors, and detection and identification errors with a certain probability occur, for example, the detection and identification errors are influenced by the air moist environment or the air bubbles in the detected cup body, so that the identification reliability is not high. In addition, the conventional liquid level detection unit generally realizes liquid level detection of a single target, and cannot realize liquid level detection of an array target.
Based on the technical problems, the applicant provides a technical scheme of the application.
Disclosure of Invention
The invention aims to provide a light reflection measuring tape, a liquid level detection device and a system, wherein the light reflection measuring tape can be used for carrying out non-contact liquid level position detection on a cup body to be detected, and particularly, the light reflection measuring tape can be used for carrying out non-contact liquid level position detection on the cup body to be detected by emitting light rays towards the cup body to be detected through detection sensors in the light reflection measuring tape and detecting the light intensity of the received reflected light rays for subsequent judgment of the liquid level position; meanwhile, the non-contact detection also avoids pollution to the liquid in the cup body to be detected, and compared with the capacitive liquid level contact detection, the liquid level detection can be rapidly and continuously carried out without cleaning the light reflection measuring ruler, so that the working efficiency is improved, and the working time is saved. In addition, the light reflection measuring scale has simple structure and lower cost.
To achieve the above object, the present invention provides a light reflection measuring tape comprising: the sensing detection circuit board and the plurality of detection sensors are arranged on the sensing detection circuit board and are uniformly arranged along a preset direction;
when measuring the liquid level position of the cup body to be measured, the plurality of detection sensors arranged along the preset direction are placed in parallel with the cup body;
the detection sensor is used for emitting light rays towards the cup body to be detected when measuring the liquid level position of the cup body and detecting the light intensity value of the received reflected light rays after the light rays are reflected.
The invention also provides a liquid level detection device, which comprises: the sensing control unit is connected to the detection sensor in each light reflection measuring scale respectively;
when measuring the liquid level of a cup body to be measured placed on a cup holder, the light reflection measuring gauges correspond to the cup body one by one, a plurality of detection sensors arranged along the preset direction in each light reflection measuring gauge are placed in parallel with the corresponding cup body, and the detection range of each detection sensor at least covers the part of the cup body capable of containing liquid;
the sensing control unit is used for controlling a plurality of detection sensors on a target light reflection measuring scale corresponding to the cup body to emit light rays towards the cup body according to a preset sequence when measuring the liquid level position of each cup body, and receiving the light intensity value of reflected light rays, detected by each detection sensor on each target light reflection measuring scale, after the light rays are reflected;
the sensing control unit is used for obtaining the liquid level position of the cup body corresponding to each target light reflection measuring rule according to the light intensity values detected by the plurality of detection sensors on each target light reflection measuring rule.
The invention also provides a liquid level detection system, comprising: the device comprises a cup holder, lifting equipment, a motion control unit, a supporting platform and the liquid level detection device, wherein the liquid level detection device is fixed on the lifting equipment, the lifting equipment is fixed on the supporting platform, and the motion control unit is in communication connection with the lifting equipment;
the cup holder is provided with a plurality of cup placing holes and a plurality of through holes, the cup placing holes and the through holes are in one-to-one correspondence in position, and the cup placing holes on the cup holder are used for placing a cup body to be tested;
the motion control unit is used for controlling the lifting equipment to descend to a detection position when the liquid level of the cup body on the cup holder is measured, so as to drive the light reflection measuring ruler on the liquid level detection device to pass through the through hole on the cup holder and be correspondingly placed in parallel with the cup body;
and the liquid level detection device is used for measuring the liquid level of the corresponding cup body by utilizing each light reflection measuring ruler after the lifting equipment descends to the detection position.
In one embodiment, the sensing circuit board is in a strip shape, and the plurality of sensing sensors are uniformly arranged in the length direction of the sensing circuit board.
In one embodiment, the light reflection gauge further comprises: an interface circuit provided with signal connectors, the signal connectors being respectively connected with the detection sensors, the signal connectors being further connected to an external sensing control unit; the signal connector is used for sending the light intensity value detected by each detection sensor to the sensing control unit.
In one embodiment, the sensing detection circuit board is divided into an avoidance area and a sensing area in the length direction; the plurality of detection sensors are arranged in the sensing area, and the signal connector in the interface circuit is fixed at one end of the sensing detection circuit board, where the avoidance area is arranged; when the liquid level position of the cup to be measured is measured, the sensing area corresponds to the part of the cup to be measured for containing liquid.
In one embodiment, the sensing control unit is configured to:
calculating the difference value between each two adjacent detection sensors on the target light reflection measuring scale for each cup body;
if two adjacent difference values meet a first preset condition, determining that the liquid level position in the cup body is the position corresponding to the center of one detection sensor shared when the two difference values are calculated, wherein the first preset condition is that the two difference values are larger than a preset threshold value;
if two adjacent difference values meet a second preset condition, determining that the liquid level position in the cup body is the position corresponding to the center of the two detection sensors used for calculating the target difference value, wherein the first preset condition is that one difference value of the two difference values is larger than a preset threshold value, the other difference value is smaller than the preset threshold value, and the target difference value is the difference value of the two difference values which is larger than the preset threshold value.
In one embodiment, the sensing control unit is further configured to determine, for each cup, that the cup is in an empty cup state if an absolute value of a difference between a light intensity value of each of the detection sensors on the target light reflection measuring scale and a corresponding reference light intensity value is smaller than a preset threshold value;
the sensing control unit is further configured to determine that the cup is in a full cup state if, for each cup, the absolute value of the difference between the light intensity value of each detection sensor on the target light reflection measuring scale and the corresponding reference light intensity value is greater than a preset threshold value, and the absolute value of the difference between each two adjacent detection sensors is less than the preset threshold value.
In one embodiment, the lifting device comprises: the light emission measuring scales on the liquid level detection device are in one-to-one correspondence with the stepping motors and are fixed;
and the motion control unit is used for controlling each stepping motor to respectively descend to a detection position when the liquid level of the cup body on the cup holder is measured, so as to drive the light reflection measuring ruler on the liquid level detection device to pass through the through hole on the cup holder and be correspondingly placed in parallel with the cup body.
In one embodiment, the cup holder is provided with M rows by N columns of the cup placing holes and M rows by N columns of the through holes; m, N are integers greater than or equal to 1;
the liquid level detection device comprises M light reflection measuring scales;
the motion control unit is used for controlling the lifting equipment to descend to a detection position when the liquid level of the cup body in the row of cup placing holes on the cup holder is measured, so that the M light reflection measuring scales penetrate through the row of through holes corresponding to the row of cup placing holes and are placed in parallel with the row of cup bodies in the cup placing holes.
Drawings
FIG. 1 is a schematic view of a light reflection measuring tape according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a cup under test in accordance with a first embodiment of the invention;
fig. 3 is a schematic view of a liquid level detection device in a second embodiment according to the present invention;
FIGS. 4 and 5 are schematic views of a cup body surface location in accordance with a second embodiment of the invention;
FIG. 6 is a schematic view of a cup holder in a third embodiment according to the invention;
fig. 7 is a schematic view of a liquid level detection system in a third embodiment according to the present invention.
Detailed Description
The following detailed description of various embodiments of the present invention will be provided in connection with the accompanying drawings to provide a clearer understanding of the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the invention, but rather are merely illustrative of the true spirit of the invention.
In the following description, for the purposes of explanation of various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment may be practiced without one or more of the specific details. In other instances, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and variations such as "comprises" and "comprising" will be understood to be open-ended, meaning of inclusion, i.e. to be interpreted to mean "including, but not limited to.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "or/and" unless the context clearly dictates otherwise.
In the following description, for the purposes of clarity of presentation of the structure and manner of operation of the present invention, the description will be made with the aid of directional terms, but such terms as "forward," "rearward," "left," "right," "outward," "inner," "outward," "inward," "upper," "lower," etc. are to be construed as convenience, and are not to be limiting.
The first embodiment of the invention relates to a light reflection measuring scale which is used for detecting the liquid level position of a cup body with certain transparency and realizing the non-contact liquid level position detection of the cup body.
As shown in fig. 1, the light reflection measuring tape 10 includes a sensing circuit board 1, and a plurality of detection sensors 2 provided on the sensing circuit board 1, the plurality of detection sensors 2 being uniformly arranged in a preset direction on the sensing circuit board 1. Specifically, the sensing circuit board 1 is elongated, and the plurality of detection sensors 2 are uniformly arranged in the longitudinal direction of the sensing circuit board 1. In some examples, the width of the detection sensor 2 in the width direction of the sensing detection circuit board 1 is smaller than the width of the sensing detection circuit board 1, so that the detection sensor 2 can be completely attached to the sensing detection circuit board 1. In the longitudinal direction of the sensing circuit board 1, a distance interval between two adjacent sensing sensors 2 is set to, for example, 0.1mm.
When measuring the liquid level position of the cup to be measured, a plurality of detection sensors arranged along the length direction of the sensing detection circuit board 1 are placed in parallel with the cup, the detection sensor 2 emits light toward the cup to be measured, and the light intensity value of the reflected light after the received light is reflected is detected. Wherein it is necessary to ensure that the optical channel is unobstructed when the detection sensor 2 emits light towards the cup to be measured.
In some examples, the light reflection measuring tape 10 further comprises an interface circuit 4 provided with a signal connector 3, and in some embodiments the signal connector 3 in the interface circuit 4 is provided with a sensor detection circuit board 1, at which time the sensor detection circuit board may be divided into a connection area on which the signal connector 3 is provided. The signal connectors 3 are respectively connected with the detection sensors 2, the signal connectors 3 are also connected to an external sensing control unit, and the signal connectors are used for sending the light intensity values detected by the detection sensors 2 to the sensing control unit. Specifically, the signal connector adopts a MX1.25 pitch type connector, wherein the pitch of the adjacent pins is 1.25mm, and the signal connector comprises a VCC pin, a GND pin, an IIC bus clock pin, and a plurality of data pins corresponding to the detection sensor 2. The signal connectors 3 are connected to corresponding connectors in the sensing control unit through terminal lines, and the sensing control unit provides power supply and communication control for the signal connectors 3.
In some examples, the sensing circuit board 1 is divided into an avoidance area 101 and a sensing area 102 in the length direction, a plurality of detection sensors 2 are disposed in the sensing area 102, and the interface circuit 4 is fixed at one end of the sensing circuit board 1 where the avoidance area 101 is disposed. In the cup body 7 shown in fig. 2, the cup body 7 is divided into an upper cup body 70 and a lower cup body 71, and a cup ring is arranged at the joint part between the upper cup body 70 and the lower cup body 71, when the cup body 7 is placed on the cup holder, the cup ring is limited by the cup holder, so that the cup body can be stably placed on the cup holder, and in order to facilitate the detection of the liquid level position, the liquid level position of the liquid contained in the cup body 7 generally does not exceed the cup ring. In order to accurately detect the liquid level, an avoidance area 101 in the sensing detection circuit board 1 is opposite to the upper cup body 70 of the cup body 7 during measurement, and the avoidance area 101 ensures that the light reflection measuring ruler 10 cannot interfere with a cup mouth part of the cup body to be detected outside the sensing area, and the sensing area in the sensing detection circuit board 1 is opposite to the lower cup body 70 of the cup body 7. The number of the detection sensors 2 arranged in the sensing area 102 is adapted to the height of the lower cup 70 of the cup 7, the height of the lower cup 70 of the cup 7 applied in the embodiment is 31mm, the height of the upper cup is 9mm, the detection sensors 2 are optical distance sensors, the height of each optical distance sensor is 2.4mm, the spacing distance between every two adjacent optical distance sensors is 0.1mm, and therefore 12 (30 mm/2.5 mm) optical distance sensors are arranged in the sensing area 102 and correspond to the height of the lower cup 70, the liquid level change in the length range of 30mm can be detected, and if other detection needs exist, the number of the optical distance sensors on the sensing area can be flexibly adjusted.
In some examples, the light reflection measuring tape 10 further has mounting holes 5 thereon, and more than 2 mounting holes 5 are used to fix the light reflection measuring tape 10 on an external lifting device. When the liquid level position of the cup to be measured is measured, the lifting device drives the light reflection measuring scale 10 to move to a corresponding position, so that the sensing area 102 corresponds to the part of the cup to be measured for containing liquid.
A second embodiment of the present invention relates to a liquid level detection apparatus, as shown in fig. 3, including: the sensing control unit 20 and at least one light reflection measuring tape 10 in the first embodiment, the sensing control unit 20 is connected to the detection sensor 2 in each light reflection measuring tape 10, respectively. For example, the sensing control unit 20 is an MCU, which is disposed on a circuit board, and a plurality of signal connectors which are respectively connected with the MCU in a communication manner are further disposed on the circuit board, and each signal connector is connected to the signal connector 3 on one light reflection measuring scale 10, so as to realize the communication connection of the MCU with the detection sensor 2 in each light reflection measuring scale 10.
When measuring the liquid level of the cup to be measured placed on the cup holder, the light reflection measuring tapes 10 are in one-to-one correspondence with the cup, and the plurality of detection sensors 2 arranged along the preset direction in each light reflection measuring tape 10 are placed in parallel with the corresponding cup, and the detection range of the plurality of detection sensors 2 at least covers the part of the cup which can hold liquid.
When measuring the liquid level position of each cup, the sensing control unit 20 controls the plurality of detection sensors 2 on the target light reflection measuring scale corresponding to the cup to emit light toward the cup in a preset order, and receives the light intensity value of the reflected light after the light detected by each detection sensor 2 on each target light reflection measuring scale is reflected.
The sensing control unit 20 obtains the liquid level position of the cup corresponding to each target light reflection measuring scale according to the light intensity values detected by the plurality of detection sensors 2 on each target light reflection measuring scale.
Specifically, after the sensing control unit 20 receives the light intensity values detected by the plurality of detection sensors 2 on each target light reflection measuring scale, for each cup, the difference between each adjacent two detection sensors 2 on the target light reflection measuring scale is calculated by analysis performed by the processor chip on the sensing control unit 20. The differences are classified into the following four cases:
first case: if the two adjacent difference values meet a first preset condition, determining that the liquid level position in the cup body is the position corresponding to the center of one detection sensor 2 shared when the two difference values are calculated, wherein the first preset condition is that the two difference values are larger than a preset threshold value. The preset threshold value is a preset jitter measurement threshold value, and is manually set according to the minimum error value acceptable by liquid level measurement. As shown in the first case of fig. 4, the plurality of detection sensors 2 on the target light reflection measuring scale are sequentially identified from the bottom to the top, and the difference between each two adjacent detection sensors 2 on the target light reflection measuring scale is calculated to obtain a difference B and a difference C which are both larger than a preset threshold value, wherein the three detection sensors 2 arranged from bottom to top are respectively a light distance sensor 20, a light distance sensor 21 and a light distance sensor 22, the difference B is the difference of light intensity values detected by the light distance sensor 20 and the light distance sensor 21, and the difference C is the difference of the light intensity values detected by the light distance sensor 21 and the light distance sensor 22, and then the liquid level position is determined to be at the center position of the sensor 21. From the state of the liquid surface in the cup corresponding to the detection sensor 2, the optical distance sensor 20 corresponds to the liquid portion in the tube, the optical distance sensor 21 corresponds to the liquid surface portion, and the optical distance sensor 22 corresponds to the air portion in the tube.
Second case: if the two adjacent differences meet the second preset condition, determining that the liquid level position in the cup body is the position corresponding to the center of the two detection sensors 2 used for calculating the target difference, wherein the first preset condition is that one difference value of the two difference values is larger than a preset threshold value, the other difference value is smaller than the preset threshold value, and the target difference value is the difference value larger than the preset threshold value of the two difference values. In the second case shown in fig. 5, the plurality of detection sensors 2 on the target light reflection measuring scale are sequentially identified from the bottom to the top, and the difference between each two adjacent detection sensors 2 on the target light reflection measuring scale is calculated to obtain a difference D greater than a preset threshold value and a difference E smaller than a preset threshold value, wherein the three detection sensors 2 arranged from bottom to top are respectively a light distance sensor 23, a light distance sensor 24 and a light distance sensor 25, the difference D is the difference of light intensity values detected by the light distance sensor 23 and the light distance sensor 24, and the difference E is the difference of the light intensity values detected by the light distance sensor 24 and the light distance sensor 25, and then it is determined that the liquid level position is at the center position of the light distance sensor 23 and the light distance sensor 24, for example, the center position of the light distance sensor 23 and the light distance sensor 24 that are connected. The optical distance sensor 23 corresponds to the liquid portion in the tube, and the optical distance sensors 24 and 25 correspond to the air portion in the tube, as viewed from the liquid level state in the cup corresponding to the detection sensor 2.
Third case: if the absolute value of the difference value between the light intensity value of each detection sensor on the target light reflection measuring ruler and the corresponding reference light intensity value is smaller than a preset threshold value, the cup body is judged to be in the empty cup state. The reference light intensity value is obtained by carrying out empty cup prediction on each target light reflection measuring rule before measurement, carrying out empty cup prediction on each target light reflection measuring rule only once, and storing the obtained reference light intensity value for subsequent measurement.
Fourth case: if the absolute value of the difference between the light intensity value of each detection sensor 2 on the target light reflection measuring scale and the corresponding reference light intensity value is larger than a preset threshold value and the absolute value of the difference between every two adjacent detection sensors 2 is smaller than the preset threshold value, the cup body is judged to be in a cup full state.
By taking the optical distance sensor adopted in the first embodiment as an example for explaining that a certain deviation exists between the measured liquid level position and the actual liquid level position in the above manner, the height of the optical distance sensor is 2.4mm, and the interval distance between the adjacent optical distance sensors is 0.1mm, the deviation between the measured liquid level position and the actual liquid level position can be deduced to be within a range of +/-1.25 mm, and the deviation range can meet the requirement of the measured error. If the recognition accuracy needs to be further improved, the movement control and recognition time of each target light reflection measuring rule need to be increased, for example, the target light reflection measuring rule is moved upwards by a small specification and high accuracy (each time at a distance of 0.1 mm), the liquid level position detection is carried out again after each movement, when the detected liquid level position approaches to the center of a certain light distance sensor, the accuracy recognition process is completed, and the total movement distance of the target light reflection measuring rule at the moment is recorded. And finally, compensating the liquid level position obtained by previous measurement through the total moving distance of the target light reflection measuring scale, thereby improving the measurement accuracy.
In some examples, the liquid level position measured in the above manner is combined with the liquid level detection manner by the capacitance value, the detection result of the non-contact liquid level position measured in the non-contact manner is obtained first, then the liquid taking needle is installed for downward detection, and the detection result of the liquid level position with contact is obtained through the identification of the change of the capacitance detection value. And comparing the two liquid level position detection results, entering an abnormal processing process if the absolute value of the difference value between the non-contact position and the capacitance sensing position exceeds a preset threshold value, and marking the liquid level position by the non-contact position if the absolute value of the difference value between the non-contact position and the contact liquid level position is within the preset threshold value range.
Specifically, by comparing two different detection modes, the error and the fault of the conventional liquid level detection by adopting the capacitance type are convenient to find and correct, and the detection precision is improved. The liquid level position detection result of the non-contact liquid level detection unit is firstly obtained, the liquid level is identified to be contacted through the change of the capacitance detection value when the liquid taking needle goes down, the liquid level position obtained through the capacitance detection is compared with the liquid level position obtained through the non-contact liquid level detection, if the error exceeds the set range, the liquid level position is considered to be abnormal, an abnormal processing process is carried out, for example, the liquid taking needle is lifted again and goes down again to carry out liquid level identification, if the set times cannot be solved, the fault which is required to be repaired is considered to be generated, and the instrument stops running and alarms. Therefore, no matter the fault is located in the non-contact liquid level detection unit, the capacitance liquid level detection unit or the sampling needle is only in contact with bubbles, the fault can be found and dealt with in time.
A third embodiment of the present invention relates to a liquid level detection system including: cup holder, lifting device, motion control unit, supporting platform and liquid level detection device in the second embodiment. The liquid level detection device is fixed on lifting equipment, the lifting equipment is fixed on a supporting platform, the motion control unit is in communication connection with the lifting equipment, and motion control of the liquid level detection device is realized through motion control of the lifting equipment.
As shown in fig. 4, the cup holder 6 is provided with a plurality of cup placing holes 60 and a plurality of through holes 61, the cup placing holes 60 and the through holes 61 are in one-to-one correspondence in position, and the cup placing holes 60 on the cup holder 6 are used for placing the cup body to be tested. When the movement control unit measures the liquid level of the cup body on the cup holder 6, the lifting equipment is controlled to descend to the detection position so as to drive the light reflection measuring ruler 10 on the liquid level detection device to pass through the through hole 61 on the cup holder 6 and correspondingly place in parallel with the cup body. After the lifting device descends to the detection position, the liquid level detection device measures the liquid level of the corresponding cup body by using each light reflection measuring scale 10.
In some examples, the lifting device includes a plurality of stepping motors, and the light emission measuring tape 10 on the liquid level detecting device is in one-to-one correspondence with and fixed to the stepping motors, for example, the stepping motors are fixed to the mounting holes 5 of the light reflection measuring tape 10. When the motion control unit measures the liquid level of the cup body on the cup holder 6, the stepping motors are controlled to be respectively lowered to the detection positions so as to drive the light reflection measuring rule 10 on the liquid level detection device to pass through the through hole 61 on the cup holder and be correspondingly placed in parallel with the cup body. The stepper motor may be a screw stepper motor, such as a 2-phase four-wire screw small progressive motor of 8mm to 10mm diameter, and the mounting hole 5 of the light reflection measuring scale 10 is connected to the slider of the screw stepper motor and locked by a screw. When the screw rod drives the sliding block to move, the screw rod stepping motor drives the light reflection measuring scale 10 to move.
In some examples, the cup holder 6 is provided with M rows by N columns of cup placement holes 60, and M rows by N columns of through holes 61, M, N each being an integer greater than or equal to 1. The liquid level detection device includes M light reflection measuring gauges 10. The motion control unit is used for controlling the lifting device to descend to a detection position when the liquid level of the cup body in the row of cup placing holes 60 on the cup holder is measured, so that M light reflection measuring scales penetrate through a row of through holes corresponding to the row of cup placing holes and are correspondingly placed in parallel with the cup body in the row of cup placing holes, and array type non-contact liquid level position detection is realized.
As shown in fig. 6, the support platform 8 is disposed vertically upward of the cup holder 6, and a lateral portion of the support platform 8 spans across the cup holder 6. For one row of through holes 61 in N rows of cup holders 6, the same number of elevating devices 80 are fixed to the support platform 8, and the light reflection measuring tape 10 is fixed to each elevating device 80. Taking the measurement direction from right to left as an example, firstly, the liquid level position of the cup body in the rightmost row of cup placing holes 60 on the cup holder 6 is measured, the lifting device 80 is controlled by the motion control unit to descend, the light reflection measuring scale 10 fixed on the lifting device 80 descends along with the lifting device 80, and after the lifting device 80 descends to the detection position, the sensing area 102 of the light reflection measuring scale 10 corresponds to the part for containing liquid in the cup body to be measured. After the completion of the liquid level measurement of the cup bodies in the row of cup placement holes 60, the movement control unit controls the lifting device 80 to ascend, and the light reflection gauge 10 fixed on the lifting device 80 ascends with the lifting device to return to the initial position. At this time, the cup holder 6 is driven to translate rightward by a certain distance, so that the supporting platform 8 is opposite to the cup body in the second row of cup placing holes 60 on the right side, and the above-mentioned movement track is continuously repeated to perform the second row of liquid level position measurement, thereby realizing the non-contact liquid level position detection on the array cup holder.
While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.
These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

Claims (10)

1. A light reflection measuring tape, comprising: the sensing detection circuit board and the plurality of detection sensors are arranged on the sensing detection circuit board and are uniformly arranged along a preset direction;
when measuring the liquid level position of the cup body to be measured, the plurality of detection sensors arranged along the preset direction are placed in parallel with the cup body;
the detection sensor is used for emitting light rays towards the cup body to be detected when measuring the liquid level position of the cup body and detecting the light intensity value of the reflected light rays.
2. The light reflection measuring tape of claim 1, wherein the sensing circuit board is elongated, and the plurality of sensing sensors are uniformly arranged in a length direction of the sensing circuit board.
3. The light reflectance ruler of claim 2, further comprising: the interface circuit is arranged on the sensing detection circuit board and comprises signal connectors which are respectively connected with the detection sensors and are also connected to an external sensing control unit;
the signal connector is used for sending the light intensity value detected by each detection sensor to the sensing control unit.
4. A light reflectance ruler according to claim 3 wherein the sensing detection circuit board is divided into a avoidance area and a sensing area in a length direction; the plurality of detection sensors are arranged in the sensing area, and the signal connector in the interface circuit is fixed at one end of the sensing detection circuit board, where the avoidance area is arranged;
when the liquid level position of the cup to be measured is measured, the sensing area corresponds to the part of the cup to be measured for containing liquid.
5. A liquid level detection device, comprising: a sensing control unit and at least one light reflection measuring tape according to any one of claims 1 to 4, the sensing control unit being connected to the detection sensors in each of the light reflection measuring tapes, respectively;
when measuring the liquid level of a cup body to be measured placed on a cup holder, the light reflection measuring gauges correspond to the cup body one by one, a plurality of detection sensors arranged along the preset direction in each light reflection measuring gauge are placed in parallel with the corresponding cup body, and the detection range of each detection sensor at least covers the part of the cup body capable of containing liquid;
the sensing control unit is used for controlling a plurality of detection sensors on a target light reflection measuring scale corresponding to the cup body to emit light rays towards the cup body according to a preset sequence when measuring the liquid level position of each cup body, and receiving the light intensity values of the reflected light rays detected by each detection sensor on each target light reflection measuring scale;
the sensing control unit is used for obtaining the liquid level position of the cup body corresponding to each target light reflection measuring rule according to the light intensity values detected by the plurality of detection sensors on each target light reflection measuring rule.
6. The liquid level detection apparatus according to claim 5, wherein the sensing control unit is configured to:
calculating the difference value between each two adjacent detection sensors on the target light reflection measuring scale for each cup body;
if two adjacent difference values meet a first preset condition, determining that the liquid level position in the cup body is the position corresponding to the center of one detection sensor shared when the two difference values are calculated, wherein the first preset condition is that the two difference values are larger than a preset threshold value;
if two adjacent difference values meet a second preset condition, determining that the liquid level position in the cup body is the position corresponding to the center of the two detection sensors used for calculating the target difference value, wherein the first preset condition is that one difference value of the two difference values is larger than a preset threshold value, the other difference value is smaller than the preset threshold value, and the target difference value is the difference value of the two difference values which is larger than the preset threshold value.
7. The liquid level detection apparatus according to claim 5, wherein the sensing control unit is further configured to determine that the cup is in an empty cup state if absolute values of differences between the light intensity values of each of the detection sensors on the target light reflection measuring scale and the corresponding reference light intensity values are all smaller than a preset threshold value, for each of the cups;
the sensing control unit is further configured to determine that the cup is in a full cup state if, for each cup, the absolute value of the difference between the light intensity value of each detection sensor on the target light reflection measuring scale and the corresponding reference light intensity value is greater than a preset threshold value, and the absolute value of the difference between each two adjacent detection sensors is less than the preset threshold value.
8. A liquid level detection system, comprising: a cup holder, a lifting device, a motion control unit, a support platform and the liquid level detection device according to any one of claims 5 to 7, wherein the liquid level detection device is fixed on the lifting device, the lifting device is fixed on the support platform, and the motion control unit is in communication connection with the lifting device;
the cup holder is provided with a plurality of cup placing holes and a plurality of through holes, the cup placing holes and the through holes are in one-to-one correspondence in position, and the cup placing holes on the cup holder are used for placing a cup body to be tested;
the motion control unit is used for controlling the lifting equipment to descend to a detection position when the liquid level of the cup body on the cup holder is measured, so as to drive the light reflection measuring ruler on the liquid level detection device to pass through the through hole on the cup holder and be correspondingly placed in parallel with the cup body;
and the liquid level detection device is used for measuring the liquid level of the corresponding cup body by utilizing each light reflection measuring ruler after the lifting equipment descends to the detection position.
9. The liquid level detection system of claim 8, wherein the lifting device comprises: the light emission measuring scales on the liquid level detection device are in one-to-one correspondence with the stepping motors and are fixed;
and the motion control unit is used for controlling each stepping motor to respectively descend to a detection position when the liquid level of the cup body on the cup holder is measured, so as to drive the light reflection measuring ruler on the liquid level detection device to pass through the through hole on the cup holder and be correspondingly placed in parallel with the cup body.
10. The liquid level detection system according to claim 8, wherein the cup holder is provided with M rows by N columns of the cup placement holes, and M rows by N columns of the through holes; m, N are integers greater than or equal to 1;
the liquid level detection device comprises M light reflection measuring scales;
the motion control unit is used for controlling the lifting equipment to descend to a detection position when the liquid level of the cup body in the row of cup placing holes on the cup holder is measured, so that the M light reflection measuring scales penetrate through the row of through holes corresponding to the row of cup placing holes and are placed in parallel with the row of cup bodies in the cup placing holes.
CN202310215005.5A 2023-03-06 2023-03-06 Light reflection measuring scale, liquid level detection device and system Pending CN116182989A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310215005.5A CN116182989A (en) 2023-03-06 2023-03-06 Light reflection measuring scale, liquid level detection device and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310215005.5A CN116182989A (en) 2023-03-06 2023-03-06 Light reflection measuring scale, liquid level detection device and system

Publications (1)

Publication Number Publication Date
CN116182989A true CN116182989A (en) 2023-05-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310215005.5A Pending CN116182989A (en) 2023-03-06 2023-03-06 Light reflection measuring scale, liquid level detection device and system

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