CN113917950B - Automatic liquid level glue injection detection device and automatic liquid level glue injection method - Google Patents
Automatic liquid level glue injection detection device and automatic liquid level glue injection method Download PDFInfo
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- CN113917950B CN113917950B CN202111156238.XA CN202111156238A CN113917950B CN 113917950 B CN113917950 B CN 113917950B CN 202111156238 A CN202111156238 A CN 202111156238A CN 113917950 B CN113917950 B CN 113917950B
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- 239000003292 glue Substances 0.000 title claims abstract description 218
- 238000002347 injection Methods 0.000 title claims abstract description 173
- 239000007924 injection Substances 0.000 title claims abstract description 173
- 239000007788 liquid Substances 0.000 title claims abstract description 54
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000523 sample Substances 0.000 claims abstract description 22
- 239000000243 solution Substances 0.000 claims description 46
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000005538 encapsulation Methods 0.000 claims description 5
- 102000008186 Collagen Human genes 0.000 claims description 2
- 108010035532 Collagen Proteins 0.000 claims description 2
- 229920001436 collagen Polymers 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 12
- 239000000047 product Substances 0.000 description 4
- 238000004382 potting Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
-
- 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)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Coating Apparatus (AREA)
Abstract
The invention discloses an automatic liquid level glue injection detection device and an automatic liquid level glue injection method, and belongs to the technical field of automatic fluid control. The control unit, the laser height measurement probe, the switching valve phase and the inclined glue injection head are combined, so that the precise control of the glue injection liquid level height is realized in a simpler and more convenient mode; the invention uses the switch valve, has low cost, simple structure and difficult blockage, avoids using the metering pump with complex and expensive structure, and can achieve the control effect similar to the metering pump. The device has the advantages of simple structure, easy manufacture, good stability, high liquid level control precision, simple and convenient use and high efficiency, can achieve the effect similar to a metering pump, is suitable for various automatic glue injection schemes under the background of automatic popularization, and has wide industrial application prospect.
Description
Technical Field
The invention belongs to the technical field of automatic fluid control, and relates to an automatic liquid level glue injection detection device and an automatic liquid level glue injection method.
Background
In the field of potting technology, in order to ensure that glue solution cannot overflow a die, waste materials or pollute a workpiece, the amount of glue solution injected by the glue solution needs to be controlled stably, and for a potting die with an open upper opening, the height of a glue solution injecting surface needs to be controlled accurately. For the filling and sealing work that the upper opening of the die is opened and the liquid level is required to be accurately kept at a certain height after filling and sealing is finally finished, the conventional filling and sealing glue injection scheme adopts a metering pump, the glue consumption is accurately calculated, and then the glue injection capacity is accurately controlled by utilizing a push rod or a bolt type pump valve. However, because the control valve contains a precise motion component, the control valve needs to work in a liquid etching state for a long time, and in order to improve the fluidity of the glue solution, the glue valve is sometimes required to be heated, and generally, high requirements on wear resistance, corrosion resistance, fatigue resistance and tightness of a metering pump are provided, so that the equipment is high in cost.
On the other hand, since the glue must be precisely metered by these complex moving parts, if the use is stopped for a period of time, the pot life of the glue is exceeded; or a small amount of glue solution which is tightly attached to the inner wall of the pump valve starts to solidify due to the fact that the glue solution is heated, and the pump valve is easy to be blocked. Because the parts have precise structures and are treated with liquid, the requirements on tightness are very high, and particularly, certain products used for filling and sealing under high vacuum conditions have higher requirements on performance, the usability is often directly affected after blockage, and the maintenance is not easy.
In addition, the high-precision quantitative encapsulation has higher requirement on the consistency of the inner volume of the encapsulated component. If the processed products are of small batches and multiple varieties, each product needs to accurately calculate the required accurate glue amount, and operation settings need to be switched every time. Meanwhile, the encapsulated workpiece and the encapsulated mold also need to have good consistency, otherwise, when the encapsulated cavity is bigger, the encapsulated cavity cannot be filled at one time according to the set glue amount; when the encapsulated cavity is smaller, the encapsulation can generate glue overflow according to the set glue quantity, even the parts which directly affect the service performance, such as the lead wires on the surface of the contaminated workpiece, can bring more quality control cost to the encapsulation equipment users.
In addition, because the viscosity of various glue solutions is different, the flow speed of the glue solutions in filling and sealing is different, and the leveling speed of the glue solutions in the filling and sealing cavity is affected by the structural complexity of the filled and sealed workpiece. If the glue is injected with the same glue amount, if the glue is injected with a workpiece which is encapsulated and has small viscosity and simple cavity structure, the glue solution is easier to flow and level quickly, and the glue solution is not easy to overflow on the surface of the workpiece; if the encapsulated workpiece with large viscosity and complex cavity structure is used, the glue solution is difficult to level, if the same glue injection speed is adopted, glue solution accumulation is likely to be generated below the glue injection position, the glue solution at the position far away from the glue injection point does not flow, and the accumulated glue solution is likely to climb up the surface of the workpiece to cause pollution. The glue injection parameters are specially designed according to glue solution characteristics, workpiece structures and filling and sealing cavities, the complexity of process control is increased, and more design, production and control time and labor cost are increased for the production requirements of small batches and multiple varieties.
Disclosure of Invention
In order to overcome the defects of complex control and high cost of the glue injection process of the upper opening filling and sealing mould in the prior art, the invention aims to provide an automatic liquid level glue injection detection device and an automatic liquid level glue injection method.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
an automatic liquid level glue injection detection device comprises a control unit and a monitoring unit electrically connected with the control unit;
the monitoring unit comprises a range finder, a switch valve and a glue injection pipeline, wherein the range finder is provided with a probe, the probe is positioned right above a glue injection point, the switch valve is arranged on the glue injection pipeline and positioned on the side edge of the outer wall of the range finder, the glue injection pipeline and the range finder are vertically arranged, the inlet end of the glue injection pipeline is connected with an external glue injection material outlet, the outlet end of the glue injection pipeline is connected with an inclined glue injection head, and the outlet end of the inclined glue injection head is positioned above the glue injection point;
the distance meter and the switch valve are respectively and electrically connected with the control unit.
Preferably, the control unit comprises a controller and a display electrically connected to the controller.
Preferably, the rangefinder is a laser rangefinder.
Preferably, the distance between the probe of the range finder and the glue injection point is 10 mm-40 mm;
the included angle between the inclined glue injection head and the horizontal plane where the glue injection point is positioned is 45-60 degrees;
the distance between the outlet end of the inclined glue injection head and the glue injection point is 0 mm-2 mm.
An automatic liquid level control glue injection method based on the liquid level glue injection automatic detection device comprises the following steps:
step 1) installing an inclined glue injection head, and adjusting the inclination angle of the inclined glue injection head to enable glue solution flowing out of an outlet end of the inclined glue injection head to be located on a glue injection point, wherein the glue injection point is located at a spot detection point of a probe on a range finder;
step 2) the control unit controls the opening and closing valve to open, so that glue solution is injected through the glue injection pipeline and the inclined glue injection head, and the control unit is provided with a preset height;
step 3) the range finder measures the glue injection height, and transmits the measured real-time glue injection height to the control unit, and the control unit receives the real-time glue injection height and compares the real-time glue injection height with a preset height;
when the real-time glue injection height is lower than the preset height, continuing glue injection; if the real-time glue injection height is equal to the preset height, stopping glue injection;
if the glue injection is continued, the control unit controls the switch valve to be continuously opened, so that the glue solution is injected through the glue injection pipeline and the inclined glue injection head;
if the glue injection is stopped, the control unit controls the switch valve to be closed, the glue flow into the inclined glue injection head is stopped, and the glue injection is stopped.
Preferably, in the step 3), after stopping the injection, standing and waiting, after standing,
the glue injection height measured by the distance measuring instrument is not changed, and the glue injection is stopped;
and (5) the glue injection height measured by the distance measuring instrument is reduced, and then the glue injection is continued.
Preferably, the standing waiting time is 1 s-40 s.
Preferably, the glue injection point is not more than 2 mm-4 mm of the laser detection point.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses an automatic liquid level glue injection detection device, which is used for realizing accurate control of the height of a glue injection liquid level in a simpler and more convenient mode by adopting a control unit, a laser height measurement probe, a switching valve phase and an inclined glue injection head; the invention uses the switch valve, has low cost, simple structure and difficult blockage, avoids using the metering pump with complex and expensive structure, and can achieve the control effect similar to the metering pump. The device has the advantages of simple structure, easy manufacture, good stability, high liquid level control precision, simple and convenient use and high efficiency, can achieve the effect similar to a metering pump, is suitable for various automatic glue injection schemes under the background of automatic popularization, and has wide industrial application prospect.
The invention also discloses an automatic liquid level glue injection method, which is completed based on the device, and the liquid level height of the glue injection point can be controlled in real time by setting the specified liquid level height and combining a laser height measurement probe with a switch valve, so that the following functions are realized: as long as the glue solution can finally realize self-leveling in the cavity to be filled and sealed, under the condition that the designated height is the completion sign after the filling and sealing is completed by using the liquid level of the whole die, the scheme can complete the opening and closing actions of the glue valve repeatedly in full automation under the conditions that the volume of the cavity to be filled and sealed is not required to be precisely known, the glue solution leveling speed is not distinguished, the volume to be filled and sealed is not required to be completely precisely consistent, and the glue injection flow rate is not required to be regulated according to the glue solution viscosity until the filling and sealing of the whole workpiece cavity is completed, and glue solution overflow and workpiece surface pollution are not caused. The invention is suitable for most glue solutions with different viscosity and leveling speed.
Drawings
FIG. 1 is a schematic diagram showing the connection of a laser altimeter probe, a switch valve, an inclined glue injection head and a computer;
FIG. 2 is a graph showing the relationship between the laser probe and the injection point and the liquid level according to the present invention;
FIG. 3 is a diagram showing the structure of the combination of the real objects of the invention;
FIG. 4 is a photograph of an injected glue;
wherein, 1-distance meter; 2-switching a valve; 3-a glue injection pipeline; 4-inclined glue injecting heads; 5-a control unit; 6-the surface of the workpiece; 7-glue solution level; 8-injecting glue points; 9-laser detection points; 10-laser beam.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
example 1
An automatic liquid level glue injection detection device, as shown in figure 1, comprises a control unit 5 and a monitoring unit electrically connected with the control unit 5;
the monitoring unit comprises a range finder 1, a switch valve 2 and an injection pipeline 3, wherein a probe is arranged on the range finder 1, the probe is positioned right above an injection point, the switch valve 2 is arranged on the injection pipeline 3 and positioned on the side edge of the outer wall of the range finder 1, the injection pipeline 3 and the range finder 1 are vertically arranged, the inlet end of the injection pipeline 3 is connected with an external injection collagen outlet, the outlet end of the injection pipeline 3 is connected with an inclined injection head 4, and the outlet end of the inclined injection head 4 is positioned above the injection point; the distance meter 1 and the switch valve 2 are respectively and electrically connected with the control unit 5.
Example 2
The other contents were the same as in example 1 except for the following.
The control unit 5 comprises a controller and a display electrically connected to the controller. The distance meter 1 is a laser distance meter. The distance between the probe of the range finder 1 and the glue injection point is 10 mm-40 mm; the included angle between the inclined glue injection head 4 and the horizontal plane where the glue injection point is positioned is 45-60 degrees; the distance between the outlet end of the inclined glue injection head 4 and the glue injection point is 0 mm-2 mm.
The specific time is programmed and determined according to specific experiments of leveling and liquid level sinking time which are jointly formed by the viscosity of the glue solution and the internal form of the encapsulation structure. The liquid with higher viscosity generally has slower leveling speed; the internal cavity has a complex structure and narrow gaps, and the sinking speed of the liquid level is reduced due to the fact that liquid permeates into the space in the workpiece slowly, so that the standing waiting time required to be set is long. The workpiece with small viscosity and simple structure of the pouring body has higher sinking speed of the liquid level, and the standing waiting time can be designed to be shorter.
Example 3
An automatic liquid level control glue injection method based on the liquid level glue injection automatic detection device, as shown in fig. 2, comprises the following steps:
step 1) installing an inclined glue injection head 4, and adjusting the inclination angle of the inclined glue injection head 4 to enable glue solution flowing out of an outlet end of the inclined glue injection head 4 to be positioned on a glue injection point, wherein the glue injection point is positioned at a spot detection point of a probe on a range finder 1;
step 2), a control unit 5 controls a switch valve 2 to be opened, so that glue solution is injected through a glue injection pipeline 3 and an inclined glue injection head 4, and a preset height is arranged in the control unit 5;
step 3), the range finder 1 measures the glue injection height, and transmits the measured real-time glue injection height to the control unit 5, and the control unit 5 receives the real-time glue injection height and compares the real-time glue injection height with a preset height;
when the real-time glue injection height is lower than the preset height, continuing glue injection; if the real-time glue injection height is equal to the preset height, stopping glue injection;
if the glue injection is continued, the control unit controls the switch valve 2 to be in a continuously opened state, so that the glue solution is injected through the glue injection pipeline 3 and the inclined glue injection head 4;
if the glue injection is stopped, the control unit controls the switch valve 2 to be closed, the glue flow into the inclined glue injection head 4 is stopped, and the glue injection is stopped. The laser beam 10 emitted by the range finder 1 reaches the glue solution liquid level 7, the glue solution flowing out of the inclined glue injection head 4 reaches the glue injection point 8 on the laser detection point 9, and the height difference between the liquid level of the glue solution after standing (solid line under the dotted line) and the preset designated liquid level (dotted line) is the liquid level descending height.
Example 4
An automatic liquid level control glue injection method comprises the following steps:
1. a height measurement probe of the laser instrument 1 is adopted and is arranged on the side surface of a vertically arranged switch valve, and a laser detection point is vertically downward (figure 1);
2. the computer controls the laser instrument 1 to measure the height and the linkage of the probe and the switch valve 2, a designated height is set by the computer according to the height reached by the surface liquid level under the normal condition after the filling and sealing of the open workpiece is finished, and the glue injection is stopped by setting and controlling the computer and sending a closing command to the switch valve when the liquid level height (the solid line at the lowest end) of the laser ranging point reaches the designated height (the broken line at the lower end) (figure 2); when the liquid level is lower than the specified height for a period of time, such as 3 seconds (the time can be set according to leveling characteristics such as viscosity of the glue solution which is specifically used), or the laser detects that the liquid level is lower than a preset value, the glue solution can be considered to flow and open, and a switch valve is sent out to open the switch valve to continue glue injection;
3. when the liquid level of the glue solution detected by the laser height measuring probe reaches the designated height and does not drop in more than one time period, for example, after 3 seconds (the time can be set according to the leveling characteristics such as the viscosity of the glue solution which is specifically used), the whole mould glue solution can be considered to be filled and leveled, a computer sends out a command to finish filling and sealing the workpiece, and the next operation (continuing to fill and seal the next workpiece or finishing the whole flow and the like) is performed.
4. The inclined glue injection head is arranged on the switch valve, and the needle head of the inclined glue injection head is required to be bent at an angle (shown in figures 1, 2, 3 and 4), so that the glue injection position can be a position (shown in figures 2 and 4) where the detection point of the laser height measurement probe is very close under the condition that the switch valve and the laser height measurement probe are arranged in parallel, and the glue injection position can be specifically designed according to the surface tension characteristic of glue solution, but can be normally within a distance of not more than 2 mm-4 mm from the laser detection point.
The present invention has targeted advantages for several types of products, including but not limited to:
(1) potting the workpiece that is particularly sensitive to the consequences of glue spilling over the upper surface;
(2) the workpiece with high viscosity, difficult quick leveling and easy generation of accumulated glue solution is required to be used;
(3) the internal structure is complex, and the glue solution is not easy to quickly flow;
(4) the glue injection position is limited, and the workpiece of the final product part of the workpiece must be accessed;
(5) the glue solution is easy to block the complex or narrow pipeline work piece;
(6) a workpiece with higher requirements on the liquid level height and position precision;
(7) small batches of multiple varieties but with a near level requirement.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (7)
1. An automatic liquid level control glue injection method based on a liquid level glue injection automatic detection device is characterized in that the liquid level glue injection automatic detection device comprises a control unit (5) and a monitoring unit electrically connected with the control unit (5); the monitoring unit comprises a range finder (1), a switch valve (2) and an injection pipeline (3), wherein a probe is arranged on the range finder (1), the probe is positioned right above an injection point, the switch valve (2) is arranged on the injection pipeline (3) and positioned on the side edge of the outer wall of the range finder (1), the injection pipeline (3) and the range finder (1) are vertically arranged, the inlet end of the injection pipeline (3) is connected with an external injection collagen outlet, the outlet end of the injection pipeline (3) is connected with an inclined injection head (4), and the outlet end of the inclined injection head (4) is positioned above the injection point; the distance meter (1) and the switch valve (2) are respectively and electrically connected with the control unit (5);
the method comprises the following steps:
step 1) installing an inclined glue injection head (4), and adjusting the inclination angle of the inclined glue injection head (4) to enable glue solution flowing out of an outlet end of the inclined glue injection head (4) to be located on a glue injection point, wherein the glue injection point is located at a light spot detection point of a probe on a range finder (1);
step 2), a control unit (5) controls a switch valve (2) to be opened, so that glue is injected through a glue injection pipeline (3) and an inclined glue injection head (4), and a preset height is arranged in the control unit (5);
step 3), the distance meter (1) measures the glue injection height, and transmits the measured real-time glue injection height to the control unit (5), the control unit (5) receives the real-time glue injection height, compares the real-time glue injection height with a preset height, and stops glue injection when the preset height is reached;
when the glue injection height is lower than the preset height for a period of time, or the distance meter (1) detects that the liquid level is lower than a preset value, continuing to inject glue; otherwise, stopping injecting the glue; the time period is programmed and determined according to a specific test of leveling and liquid level sinking time formed by the viscosity of the glue solution and the internal form of the encapsulation structure;
if the glue injection is continued, the control unit controls the switch valve (2) to be in a continuously opened state, so that the glue solution is injected through the glue injection pipeline (3) and the inclined glue injection head (4);
if the glue injection is stopped, the control unit controls the switch valve (2) to be closed, the glue flow into the inclined glue injection head (4) is stopped, and the glue injection is stopped.
2. The automatic liquid level control glue injection method according to claim 1, wherein in the step 3), after stopping glue injection, standing still for waiting, after standing still,
the glue injection height measured by the distance measuring instrument (1) is not changed, and the glue injection is stopped;
and the glue injection height measured by the distance measuring instrument (1) is reduced, and then the glue injection is continued.
3. The automatic liquid level control glue injection method according to claim 2, wherein the standing waiting time is 1 s-40 s.
4. The automatic liquid level control glue injection method according to claim 1, wherein the glue injection point is not more than 2mm to 4mm beyond the laser detection point.
5. The automatic level control glue injection method according to claim 1, characterized in that the control unit (5) comprises a controller and a display electrically connected to the controller.
6. The automatic level control glue injection method according to claim 1, characterized in that the distance meter (1) is a laser distance meter.
7. The automatic liquid level control glue injection method according to claim 1, wherein the distance between the probe of the distance meter (1) and the glue injection point is 10 mm-40 mm;
the included angle between the inclined glue injection head 4 and the horizontal plane where the glue injection point is positioned is 45-60 degrees;
the distance between the outlet end of the inclined glue injection head 4 and the glue injection point is 0 mm-2 mm.
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