A high-precision filling control system for liquid materials

Abstract

The present invention relates to the technical field of precise control of liquid material filling, and specifically to a high-precision liquid material filling control system. The control system includes a control terminal and a human-computer interaction module, a feeding module and a monitoring module connected to the control terminal signal; the human-computer interaction module is used to input the target injection volume; the feeding module includes a receiving bin, a liquid filling pump, a connecting pipe, a first branch pipe and a second branch pipe, the outlet of the liquid filling pump is connected to one end of the connecting pipe, and the first branch pipe and the second branch pipe are both connected to the other end of the connecting pipe; the control terminal controls the feeding module to fill liquid materials through the first branch pipe; the monitoring module can continuously monitor the first injection time and feedback to the control terminal, and the control terminal controls the feeding module to switch to filling liquid materials through the second branch pipe when the first injection time reaches the first preset time. It can shorten the filling time and improve the filling efficiency while ensuring the liquid material filling accuracy requirements.

Description

Technical Field

[0001] The invention relates to the technical field of precise control of liquid material filling, and in particular to a high-precision liquid material filling control system. Background Art

[0002] In areas such as battery electrolytes and medicines that require precise component ratios, high-precision quantitative filling of liquid materials is an extremely important step. Its accuracy directly determines the reliability of product performance and the stability of batch product quality (referring to the quality differences between individuals in a batch of products). Similarly, in precision tests, the accuracy of liquid material component filling also directly affects the accuracy of the test results.

[0003] However, the measurement accuracy of existing measuring equipment such as liquid level meters, flow meters, etc. is not sufficient to meet the above-mentioned demand for high-precision filling of liquid materials. Summary of the invention

[0004] The purpose of the present invention is to provide a high-precision liquid material filling control system, which can at least partially overcome the above-mentioned technical problems and can control the filling process of liquid materials on the basis of the measurement accuracy of existing equipment, thereby shortening the filling time and improving the filling efficiency while ensuring the liquid material filling accuracy requirements.

[0005] The high-precision liquid material filling control system provided by the present invention comprises a control terminal and a human-computer interaction module, a feeding module and a monitoring module connected to the control terminal by signal; the human-computer interaction module is used to input a target injection amount; the feeding module comprises a receiving bin, a liquid adding pump, a connecting pipe, a first branch pipe and a second branch pipe, the outlet of the liquid adding pump is connected to one end of the connecting pipe, and the first branch pipe and the second branch pipe are both connected to the other end of the connecting pipe; the liquid adding pump can fill the liquid material into the receiving bin through the first branch pipe or the second branch pipe; the control terminal controls the feeding module to fill the liquid material into the receiving bin through the first branch pipe in response to the target injection amount; the monitoring module can continuously monitor the first injection time of the liquid material injected into the receiving bin through the first branch pipe and feed back to the control terminal, and when the first injection time reaches the first preset time, the control terminal controls the feeding module to switch to filling the liquid material into the receiving bin through the second branch pipe.

[0006] Furthermore, the first preset duration is obtained based on the target injection volume, the injection rate of the first branch pipe, the control accuracy duration of the control terminal, and the delayed outflow volume of the first branch pipe after the feeding module switches to filling the receiving bin with liquid material through the second branch pipe.

[0007] Furthermore, the first preset duration is obtained according to the following method:

[0008] ,

[0009] in, t c To control the control accuracy duration of the control terminal, W 0 is the target injection amount, W d1 It is the delayed outflow of the first branch pipe after the feeding module switches to filling the receiving bin with liquid material through the second branch pipe. v 1 is the injection rate of the first branch, n 1 is a natural number, n 1 t c This is the first preset duration.

[0010] Further, the monitoring module includes a liquid level sensor, which is used to monitor the liquid level height in the receiving bin and feed back to the control terminal; the control terminal obtains the current injection amount of the liquid material injected into the receiving bin according to the liquid level height, and obtains the corrected first preset duration according to the current injection amount and the current first injection duration; the corrected first preset duration is expressed as:

[0011] ,

[0012] in, t x is the first preset duration after correction, W is the current injection volume, t is the current first injection duration; when the first injection duration reaches the corrected first preset duration, the control terminal controls the feeding module to switch to filling the liquid material into the receiving bin through the second branch pipe.

[0013] Furthermore, after the control terminal controls the feeding module to switch to fill the receiving bin with liquid material through the second branch pipe, it also includes: when the second injection time injected into the receiving bin through the second branch pipe reaches a second preset time, the control terminal controls the second branch pipe to stop injection.

[0014] Furthermore, the monitoring module includes a liquid level sensor, which is used to monitor the liquid level height in the receiving bin and feed it back to the control terminal; the control terminal obtains the injection amount when switching to filling the liquid material into the receiving bin through the second branch pipe according to the liquid level height; the second preset time length is obtained according to the following method:

[0015] ,

[0016] in,t c To control the control accuracy duration of the control terminal, W 0 is the target injection amount, W 1 is the injection amount when switching to filling liquid material into the receiving bin through the second branch pipe, v 2 is the injection rate of the second branch, n 2 is a natural number, n 2 t c The second preset duration.

[0017] Furthermore, a needle valve is connected in series on the second branch pipe, and a driving unit for driving the needle valve to open and close is electrically connected to the control terminal; after the second branch pipe stops injecting, the method further includes: the control terminal controls the driving unit to drive the needle valve to open for intermittent drip injection; the difference between the current injection amount and the target injection amount is obtained through the current injection amount collected by the monitoring module; the control terminal controls the intermittent drip injection to stop injection in response to the difference to satisfy the following relationship:

[0018] ,

[0019] in, W is the current injection volume, W 0 is the target injection amount, δ 1 is the lower deviation of the target injection amount, δ 2 is the upper deviation of the target injection amount.

[0020] Furthermore, the monitoring module also includes a weighing sensor, one end of which is connected to a fixed bracket, and the other end of which is connected to the receiving bin; during the intermittent drip filling, the control terminal obtains the current injection amount through the weighing sensor.

[0021] Further, according to the single change amount of the current injection amount during the intermittent drip injection collected by the monitoring module, the single drip injection amount of the intermittent drip injection is obtained; the injection amount when the intermittent drip injection stops and the single drip injection amount meet ,

[0022] And meet In the case of, the driving unit is controlled to drive the needle valve to open and perform a single drip injection, otherwise, the liquid material injection process is terminated; wherein, W 3 is the injection volume when the intermittent drip injection stops, ∆ W is a single drip injection amount; after a single drip injection, it also includes: the injection amount when the single drip injection stops and the single drip injection amount meet ,

[0023] And meet In the case of the above, the driving unit is controlled to drive the needle valve to open and perform a single drip injection, otherwise, the liquid material injection process is terminated.

[0024] Furthermore, the feeding module also includes a pressure relief pipe, one end of which is connected to the connecting pipe, and the other end of which is connected to the inlet of the liquid adding pump; a pressure relief valve is connected in series on the pressure relief pipe, and when the pressure in the first branch pipe or the second branch pipe is greater than a preset pressure, the pressure relief valve is turned on to relieve pressure.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] 1. The high-precision liquid material filling control system provided by the embodiment of the present disclosure can enable the first branch pipe to inject as much liquid material as possible into the receiving bin by optimizing the first preset time length, thereby saving the time for the second branch pipe to finely fill the remaining liquid material required for filling, thereby achieving the purpose of satisfying the filling accuracy while reducing the filling time and improving the filling efficiency;

[0027] 2. The high-precision liquid material filling control system provided by the embodiment of the present disclosure can realize drip filling of the second branch pipe by connecting a needle valve in series on the second branch pipe, so that the actual injection amount falls within the allowable error range of the target injection amount;

[0028] 3. The high-precision liquid material filling control system provided by the embodiment of the present disclosure can return the redundant output flow of the filling pump to the input end of the filling pump by setting a pressure relief pipe and a pressure relief valve, thereby achieving the purpose of protecting the pipeline of the second branch pipe; it can also stabilize the injection rate of the second branch pipe; and in the process of intermittent drip filling, it also greatly reduces the pressure on the valve plug of the needle valve, which is beneficial to ensure the smooth movement of the valve plug, thereby reducing the difference in the single drip filling amount of the needle valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0030] Figure 1 It is a structural block diagram of the liquid material high-precision filling control system drawn according to an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of the hardware structure of the high-precision liquid material filling control system drawn according to an embodiment of the present invention;

[0032] Figure 3The figure is a flow chart of high-precision filling of liquid materials by the high-precision filling control system for liquid materials drawn according to an embodiment of the present invention.

[0033] Marks and corresponding parts names in the attached drawings:

[0034] 1-control terminal; 2-human-computer interaction module; 3-feeding module; 31-receiving bin; 32-liquid adding pump; 33-connecting pipe; 34-first branch pipe; 341-electrically controlled valve; 35-second branch pipe; 351-needle valve; 36-pressure relief pipe; 361-pressure relief valve; 4-monitoring module; 42-weighing sensor. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and drawings. The schematic implementation modes and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention. It should be noted that the present invention is already in the actual development and use stage.

[0036] In the current manufacturing industry, it is common to need to accurately add a certain amount of liquid materials. For example, in areas such as battery electrolytes and medicines that require precise component ratios, high-precision quantitative filling of liquid materials is an extremely important step. Its accuracy directly determines the reliability of product performance and the stability of batch product quality (referring to the quality differences between individuals in a batch of products). Similarly, in precision tests, the accuracy of liquid material component filling also directly affects the accuracy of the test results.

[0037] However, the measurement accuracy of existing measuring equipment such as liquid level meters and flow meters is not enough to meet the above-mentioned high-precision filling requirements of liquid materials. In addition, although precision filling equipment such as pipette guns can meet the precision requirements, the filling efficiency is low and it is time-consuming.

[0038] To this end, the present invention provides a high-precision liquid material filling control system, which can improve the filling accuracy and filling efficiency of the liquid material by controlling the filling process of the liquid material on the basis of the measurement accuracy of the existing equipment, thereby shortening the filling time and improving the filling efficiency while ensuring the filling amount accuracy requirements.

[0039] Embodiment 1:

[0040] like Figures 1 to 3 As shown, this embodiment provides a high-precision liquid material filling control system, including a control terminal 1 and a human-computer interaction module 2, a feeding module 3 and a monitoring module 4 connected to the control terminal 1 by signal;

[0041] The human-computer interaction module 2 is used to input the target injection volume;

[0042] The feeding module 3 includes a receiving bin 31, a liquid adding pump 32, a connecting pipe 33, a first branch pipe 34 and a second branch pipe 35. The outlet of the liquid adding pump 32 is connected to one end of the connecting pipe 33, and the first branch pipe 34 and the second branch pipe 35 are both connected to the other end of the connecting pipe 33. The liquid adding pump 32 can add liquid material to the receiving bin 31 through the first branch pipe 34 or the second branch pipe 35.

[0043] The control terminal 1 controls the feeding module 3 to inject liquid material into the receiving bin 31 through the first branch pipe 34 in response to the target injection amount;

[0044] The monitoring module 4 can continuously monitor the first injection duration of the liquid material into the receiving bin 31 through the first branch pipe 34 and feed back to the control terminal 1. When the first injection duration reaches the first preset duration, the control terminal 1 controls the feeding module 3 to switch to adding liquid material to the receiving bin 31 through the second branch pipe 35.

[0045] It should be understood that the control terminal 1 is composed of a controller and an industrial control computer, the controller is used to receive data and issue control instructions, and the industrial control computer is used for analysis and calculation; the flow area of ​​the first branch pipe 34 is much larger than the flow area of ​​the second branch pipe 35, preferably, the flow area ratio of the first branch pipe 34 to the flow area of ​​the second branch pipe 35 is 10:1~20:1, in order to fully utilize the output flow of the liquid adding pump 32 to achieve rapid filling, the first branch pipe 34 is configured to adapt to the output flow of the liquid adding pump 32. Obviously, valves are respectively provided on the first branch pipe 34 and the second branch pipe 35, such as Figure 2 As shown, an electric control valve 341 is provided on the first branch pipe 34 , and by closing the electric control valve 341 and opening the valve on the second branch pipe 35 , the liquid material can be added to the receiving bin 31 through the second branch pipe 35 .

[0046] Accordingly, after confirming the target injection volume, the high-precision liquid material filling control system provided in the present embodiment controls the first branch pipe 34 to first perform a quick filling process of a first preset time toward the receiving bin 31, so that the injection volume in the receiving bin 31 quickly approaches the target injection volume, and then closes the first branch pipe 34, opens the second branch pipe 35, and uses the second branch pipe 35 to finely fill the remaining liquid material required to be filled into the receiving bin 31, thereby reducing the filling time and improving the filling efficiency while meeting the filling accuracy.

[0047] However, it is usually difficult to achieve the optimal filling time by merely setting the first preset time based on experience, and in the case where the flow area difference between the first branch pipe 34 and the second branch pipe 35 is too large, the deviation of the first preset time set based on experience can easily lead to overfilling (that is, the first preset time is set longer, resulting in an excess filling amount), or it can easily lead to the second branch pipe 35 taking too long to fill the remaining liquid material required (that is, the first preset time is set shorter, and thus the liquid material that should have been filled by the first branch pipe 34 needs to be filled by the second branch pipe 35. Obviously, the filling rate of the second branch pipe 35 is much lower than that of the first branch pipe 34, and thus a longer time is required), thereby failing to achieve the purpose of reducing the filling time and improving the filling efficiency.

[0048] To this end, preferably, the first preset duration of the present implementation is obtained based on the target injection volume, the injection rate of the first branch pipe 34, the control accuracy duration of the control terminal 1, and the delayed outflow amount of the first branch pipe 34 after the feeding module 3 switches to filling the receiving bin 31 with liquid material through the second branch pipe 35.

[0049] Specifically, the first preset duration is obtained according to the following method:

[0050] ,

[0051] in, t c is the control accuracy duration of the control terminal (referring to the time step that the control terminal can reliably control), W 0 is the target injection amount, W d1 It is the delayed outflow of the first branch pipe after the feeding module switches to filling the receiving bin with liquid material through the second branch pipe. v 1 is the injection rate of the first branch, n 1 is a natural number, n 1 t c This is the first preset duration.

[0052] Preferably, the delayed outflow amount of the first branch pipe 34 after the feed module 3 is switched to fill the receiving bin 31 with liquid material through the second branch pipe 35 is obtained in advance through experiments.

[0053] Through the above formula, we can get n1, and then the first preset time length is obtained. Compared with the first preset time length set in advance by experience, the above method of obtaining the first preset time length takes into account the target injection amount, the injection rate of the first branch pipe 34, the control accuracy time length of the control terminal 1, and the delayed outflow of the first branch pipe 34 after the feed module 3 switches to fill the receiving bin 31 with liquid materials through the second branch pipe 35, thereby optimizing the first preset time length. Based on the first preset time length obtained in the above method, the first branch pipe 34 can inject as much liquid material as possible into the receiving bin 31, thereby saving the time for the second branch pipe 35 to finely fill the remaining liquid material required to be filled, thereby achieving the purpose of reducing the filling time and improving the filling efficiency while meeting the filling accuracy.

[0054] Preferably, the monitoring module 4 includes a liquid level sensor (not shown in the figure), which is used to monitor the liquid level in the receiving bin 31 and feed back to the control terminal 1;

[0055] The control terminal 1 obtains the current injection amount of the liquid material injected into the receiving bin 31 according to the liquid level height, and obtains the corrected first preset duration according to the current injection amount and the current first injection duration;

[0056] The corrected first preset duration is expressed as:

[0057] ,

[0058] in, t x is the first preset duration after correction, W is the current injection volume, t The duration of the current first injection;

[0059] When the first injection duration reaches the corrected first preset duration, the control terminal 1 controls the feeding module 3 to switch to injecting liquid material into the receiving bin 31 through the second branch pipe 35 .

[0060] It should be understood that a longitudinal wave-breaking plate (not shown in the figure) is provided in the receiving bin 31, thereby reducing the liquid surge in the receiving bin 31 caused by the process of filling the liquid material into the receiving bin 31 through the first branch pipe 34, thereby enabling the liquid level monitored by the liquid level sensor to be more accurate. Preferably, the current injection amount in the receiving bin 31 is proportional to the liquid level height (i.e., the cross-sectional area of ​​the inner cavity of the receiving bin 31 remains unchanged along the height direction), thereby saving the amount of calculation in the process of obtaining the current injection amount from the liquid level height, thereby improving the data processing speed of the control terminal 1.

[0061] Therefore, by monitoring the liquid level depth of the receiving bin 31 in real time during the process of filling the liquid material in the first branch pipe 34, the current injection amount can be obtained in real time, and the current average injection rate of the first branch pipe 34 can be obtained based on the current injection amount, and then the preset first time length can be corrected in real time according to the real-time average injection rate. Therefore, the high-precision liquid material filling control system can adapt to the output flow fluctuations of the liquid filling pump 32.

[0062] Embodiment 2:

[0063] This embodiment is based on Embodiment 1, except that, in this embodiment:

[0064] After the control terminal 1 controls the feeding module 3 to switch to fill the receiving bin 31 with liquid material through the second branch pipe 35, the method further includes:

[0065] When the second injection time length injected into the receiving bin 31 through the second branch pipe 35 reaches the second preset time length, the control terminal 1 controls the second branch pipe 35 to stop injection.

[0066] Preferably, the feed module 3 further comprises a pressure relief pipe 36, one end of the pressure relief pipe 36 is connected to the connecting pipe 33, and the other end of the pressure relief pipe 36 is connected to the inlet of the liquid adding pump 32;

[0067] A pressure relief valve 361 is connected in series to the pressure relief pipe 36 . When the pressure in the first branch pipe 34 or the second branch pipe 35 is greater than a preset pressure, the pressure relief valve 361 is turned on to relieve pressure.

[0068] It should be understood that the purpose of setting the pressure relief valve 361 is to protect the pipeline of the second branch pipe 35. Specifically, since the first branch pipe 34 is configured to adapt to the output flow of the liquid adding pump 32, and since the flow area of ​​the second branch pipe 35 is much smaller than the first branch pipe 34, when switching to filling the receiving bin 31 with liquid material through the second branch pipe 35, the closing of the first branch pipe 34 will cause the pressure in the pipeline to rise significantly. At this time, the pressure relief valve 361 is turned on to relieve the pressure and return the redundant output flow to the input end of the liquid adding pump 32, thereby achieving the purpose of protecting the pipeline of the second branch pipe 35. Obviously, the preset pressure should be adapted to the flow area of ​​the second branch pipe 35. Accordingly, the setting of the pressure relief valve 361 can also serve the purpose of stabilizing the injection rate of the second branch pipe 35.

[0069] Specifically, the control terminal 1 obtains the injection amount when switching to filling the liquid material into the receiving bin 31 through the second branch pipe 35 according to the liquid level height;

[0070] The second preset duration is obtained according to the following method:

[0071] ,

[0072] in, t c To control the control accuracy duration of the control terminal, W 0 is the target injection amount, W 1 is the injection amount when switching to filling liquid material into the receiving bin through the second branch pipe, v 2 is the injection rate of the second branch, n 2 is a natural number, n 2 t c The second preset duration.

[0073] It should be understood that, since the flow area of ​​the second branch pipe 35 is relatively small, after the filling of the second branch pipe 35 stops, the liquid in the second branch pipe 35 is not easy to flow out due to the surface tension of the liquid.

[0074] Preferably, a needle valve 351 is also connected in series on the second branch pipe 35, and a driving unit (preferably a stepping motor, which can control the movement of the valve plug) for driving the needle valve 351 to open and close is electrically connected to the control terminal 1;

[0075] After the second branch pipe 35 stops injecting, the method further includes:

[0076] The control terminal 1 controls the driving unit to drive the needle valve 351 to open for intermittent drip filling;

[0077] Obtaining the difference between the current injection amount and the target injection amount through the current injection amount collected by the monitoring module 4;

[0078] The control terminal 1 controls the intermittent drip injection to stop injection in response to the difference to satisfy the following relationship:

[0079] ,

[0080] in, W is the current injection volume, W 0 is the target injection amount, δ 1 is the lower deviation of the target injection amount, δ 2 is the upper deviation of the target injection amount.

[0081] Accordingly, the present embodiment can obtain an optimized second preset time length compared to the second preset time length pre-set by experience, and thus can accurately grasp the injection time length of the second branch pipe 35, so that the injection amount when the second branch pipe 35 stops injecting is closer to the target injection amount, and the time length required for subsequent intermittent drip filling is reduced; by connecting the needle valve 351 in series on the second branch pipe 35, the drip filling of the second branch pipe 35 can be realized (the needle valve 351 is slightly opened, so that the second branch pipe 35 injects liquid material in the form of droplets toward the end of the receiving bin 31 injecting liquid material, and accordingly, intermittent drip filling refers to continuous drop-by-drop injection of liquid material), so that the actual injection amount falls within the error range allowed by the target injection amount. Obviously, the needle valve 351 is slightly opened, so that the amount of a single drop of liquid material injected in the form of droplets toward the end of the receiving bin 31 injecting liquid material should be less than or equal to the allowable deviation of the target injection amount.

[0082] Obviously, the pressure relief valve 361 is turned on to relieve pressure and returns the redundant output flow to the input end of the liquid filling pump 32, thereby protecting the pipeline of the second branch pipe 35. At the same time, it also greatly reduces the pressure on the valve plug of the needle valve 351 during the intermittent drip filling process, which is beneficial to ensure the smooth movement of the valve plug and reduce the difference in the single drip filling amount of the needle valve 351.

[0083] Preferably, the monitoring module 4 further includes a weighing sensor 42, one end of the weighing sensor 42 is connected to a fixed bracket, and the other end of the weighing sensor 42 is connected to the receiving bin 31;

[0084] During the intermittent drip filling, the control terminal 1 obtains the current injection amount through the weighing sensor 42.

[0085] Obviously, in the early stage of filling the first branch pipe 34, since the injection rate of the first branch pipe 34 is relatively fast, it will cause impact on the material in the receiving bin 31. Under the action of the wave-breaking plate, the current injection amount is obtained more immediately and accurately through the liquid level depth sensed by the liquid level sensor (under the impact, it is difficult for the weighing sensor 42 to accurately monitor the current injection amount); and during the above-mentioned intermittent drip filling, the impact caused by the filling of a drop of liquid material is extremely small, and the weighing sensor 42 can accurately sense the current injection amount in the receiving bin 31 (the injection of each drop of liquid material is unlikely to cause a change in the liquid level, and the liquid level meter is difficult to provide accurate monitoring data), thereby ensuring that the intermittent drip filling process is terminated in time when the current injection amount falls within the allowable error range of the target injection amount.

[0086] Embodiment 3:

[0087] This embodiment is based on Embodiment 2, except that, in this embodiment:

[0088] According to the single change amount of the current injection amount during the intermittent drip injection collected by the monitoring module 4, the single drip injection amount of the intermittent drip injection is obtained; preferably, the single drip injection amount is the average of the single change amount of the current injection amount during the intermittent drip injection;

[0089] The injection volume when the intermittent drip injection stops and the single drip injection volume meet ,

[0090] And meet In the case of the above, the driving unit is controlled to drive the needle valve 351 to open and perform a single drip injection, otherwise, the liquid material injection process is terminated;

[0091] in, W 3 is the injection volume when the intermittent drip injection stops, ∆ W This is the amount for a single drip.

[0092] Preferably, after a single drip injection, the method further includes:

[0093] The injection volume when the single drip injection stops injection and the single drip injection volume meet ,

[0094] And meet In the case of the above, the driving unit is controlled to drive the needle valve 351 to open and perform a single drip injection, otherwise, the liquid material injection process is terminated.

[0095] Accordingly, after the current injection volume is made to fall within the allowable error range of the target injection volume through intermittent drip filling and the injection is stopped, through this embodiment, the final injection volume injected into the receiving bin 31 can be made closer to the target injection volume (that is, the difference between the actual injection volume and the target injection volume can be reduced as much as possible).

[0096] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-precision liquid material filling control system, characterized in that: It comprises a control terminal (1), a human-machine interaction module (2), a feeding module (3) and a monitoring module (4) which are signal-connected to the control terminal (1); The human-computer interaction module (2) is used to input a target injection volume; The feed module (3) comprises a receiving bin (31), a liquid adding pump (32), a connecting pipe (33), a first branch pipe (34) and a second branch pipe (35); the outlet of the liquid adding pump (32) is connected to one end of the connecting pipe (33), and the first branch pipe (34) and the second branch pipe (35) are both connected to the other end of the connecting pipe (33); the liquid adding pump (32) is capable of adding liquid material to the receiving bin (31) through the first branch pipe (34) or the second branch pipe (35); The control terminal (1) controls the feed module (3) to inject liquid material into the receiving bin (31) through the first branch pipe (34) in response to the target injection amount; The monitoring module (4) is capable of continuously monitoring a first injection duration of the liquid material injected into the receiving bin (31) through the first branch pipe (34) and feeding back the duration to the control terminal (1); and when the first injection duration reaches a first preset duration, the control terminal (1) controls the feeding module (3) to switch to injecting the liquid material into the receiving bin (31) through the second branch pipe (35); The first preset duration is obtained according to the following method: ， in, t c To control the control accuracy duration of the control terminal, W 0 is the target injection amount, W d1 It is the delayed outflow of the first branch pipe after the feeding module switches to filling the receiving bin with liquid material through the second branch pipe. v 1 is the injection rate of the first branch, n 1 is a natural number, n 1 t c is the first preset duration; After the control terminal (1) controls the feeding module (3) to switch to filling the receiving bin (31) with liquid material through the second branch pipe (35), the method further comprises: The control terminal (1) controls the second branch pipe (35) to stop injection when a second injection time length injected into the receiving bin (31) through the second branch pipe (35) reaches a second preset time length; The monitoring module (4) comprises a liquid level sensor, which is used to monitor the liquid level in the receiving bin (31) and feed back the liquid level to the control terminal (1); The control terminal (1) acquires the injection amount when switching to filling the liquid material into the receiving bin (31) through the second branch pipe (35) according to the liquid level height; The second preset duration is obtained according to the following method: ， in, t c To control the control accuracy duration of the control terminal, W 0 is the target injection amount, W 1 is the injection amount when switching to filling liquid material into the receiving bin through the second branch pipe, v 2 is the injection rate of the second branch, n 2 is a natural number, n 2 t c is the second preset duration; A needle valve (351) is also connected in series to the second branch pipe (35), and a driving unit for driving the needle valve (351) to open and close is electrically connected to the control terminal (1); After the injection of the second branch pipe (35) is stopped, the method further comprises: The control terminal (1) controls the drive unit to drive the needle valve (351) to open for intermittent drip injection; Obtaining a difference between the current injection amount and the target injection amount through the current injection amount collected by the monitoring module (4); The control terminal (1) controls the intermittent drip injection to stop injection in response to the difference to satisfy the following relationship: ， in, W is the current injection volume, W 0 is the target injection amount, δ 1 is the lower deviation of the target injection amount, δ 2 is the upper deviation of the target injection amount; The monitoring module (4) further comprises a weighing sensor (42), one end of the weighing sensor (42) being connected to a fixed bracket, and the other end of the weighing sensor (42) being connected to the receiving bin (31); During the intermittent drip filling, the control terminal (1) obtains the current injection amount through the weighing sensor (42); Obtaining a single drip injection amount of the intermittent drip injection according to a single change amount of the current injection amount during the intermittent drip injection collected by the monitoring module (4); The injection volume when the intermittent drip injection stops and the single drip injection volume meet , And meet In the case of a liquid material filling failure, the driving unit is controlled to drive the needle valve (351) to open and perform a single drip filling; otherwise, the liquid material filling process is terminated; in, W 3 is the injection volume when the intermittent drip injection stops, ∆ W The amount to be added for a single drip; After a single drip injection, it also includes: The injection volume when the single drip injection stops injection and the single drip injection volume meet , And meet In the case of a liquid material filling failure, the driving unit is controlled to drive the needle valve (351) to open and perform a single drip filling; otherwise, the liquid material filling process is terminated.

2. The high-precision liquid material filling control system according to claim 1 is characterized in that: The first preset duration is obtained based on the target injection volume, the injection rate of the first branch pipe (34), the control accuracy duration of the control terminal (1), and the delayed outflow volume of the first branch pipe (34) after the feeding module (3) switches to filling the receiving bin (31) with liquid material through the second branch pipe (35).

3. The high-precision liquid material filling control system according to claim 1 is characterized in that: The monitoring module (4) comprises a liquid level sensor, which is used to monitor the liquid level in the receiving bin (31) and feed back the liquid level to the control terminal (1); The control terminal (1) acquires the current injection amount of the liquid material injected into the receiving bin (31) according to the liquid level height, and obtains a corrected first preset duration according to the current injection amount and the current first injection duration; The corrected first preset duration is expressed as: ， in, t x is the first preset duration after correction, W is the current injection volume, t The duration of the current first injection; When the first injection duration reaches the corrected first preset duration, the control terminal (1) controls the feed module (3) to switch to injecting liquid material into the receiving bin (31) through the second branch pipe (35).

4. The high-precision liquid material filling control system according to claim 1 is characterized in that: The feed module (3) further comprises a pressure relief pipe (36), one end of the pressure relief pipe (36) being connected to the connecting pipe (33), and the other end of the pressure relief pipe (36) being connected to the inlet of the liquid adding pump (32); A pressure relief valve (361) is connected in series to the pressure relief pipe (36). When the pressure in the first branch pipe (34) or the second branch pipe (35) is greater than a preset pressure, the pressure relief valve (361) is turned on to relieve pressure.

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