High-precision liquid quality control device

Abstract

The high-precision liquid quality control device comprises a weighing mechanism, a material mixing barrel and a liquid injection mechanism, and the material mixing barrel is provided with a liquid inlet main pipe and a liquid inlet auxiliary pipe; the liquid injection mechanism comprises a hard pipe which is inserted into the liquid inlet main pipe; the first stop valve is mounted on the hard pipe; the liquid injection pipeline is connected with the material source and the hard pipe, a plurality of control branches which are arranged in parallel are arranged on the liquid injection pipeline, and control valves with different flow rates are arranged on the control branches; the needle cylinder is provided with a cylinder body and a liquid injection needle, and the liquid injection needle is inserted into the auxiliary liquid inlet pipe; the second stop valve is mounted on the liquid injection needle; one end of the liquid supplementing pipe is connected with the lower part of the internal space of the needle cylinder, and the other end is connected with a corresponding material source; the third stop valve is mounted on the liquid supplementing pipe; the piston rod assembly is mounted on the needle cylinder; the electric push rod drives the piston rod assembly to move downwards. According to the invention, high-precision liquid quality control can be realized.

Description

Technical Field

[0001] The invention relates to the field of liquid mixing, and in particular to a high-precision liquid quality control device. Background Art

[0002] In the industrial manufacturing process, multiple liquids need to be mixed. The traditional mixing method is to control the amount of material added through an electronic scale. Specifically, the opening and closing of the valve on the feeding pipeline is controlled according to the numerical value of the electronic scale. This feeding method requires setting the advance amount based on experience. The instability of the pressure at the source of the liquid addition will cause a large deviation and increase the number of mixing failures.

[0003] Patent document with announcement number CN 218890393 U discloses an online mixing system for semiconductor workpiece processing fluid, which controls the amount of material through a mass flow controller, and then sends the mixed solution to an online analyzer for detection, and the detection result is sent to a control device to adjust the control parameters as needed. This mixing device has a complex structure, a duplicated control method, and is limited to the analysis of the online analyzer. There are restrictions on the type of mixed liquid, the overall applicability is poor, and a mixed liquid with high mixing accuracy cannot be simply and directly obtained. Summary of the invention

[0004] In view of the above problems, the present invention proposes a high-precision liquid quality control device.

[0005] The technical solution adopted by the present invention is as follows: A high-precision liquid quality control device, comprising a weighing mechanism, a mixing barrel, and a plurality of liquid injection mechanisms connected to the mixing barrel, wherein different liquid injection mechanisms are used to convey different liquids, the mixing barrel is placed on the weighing mechanism, and the upper end of the mixing barrel has a plurality of groups of liquid inlet structures, each of which corresponds to each of the liquid injection mechanisms, and each group of liquid inlet structures comprises a liquid inlet main pipe and a liquid inlet auxiliary pipe both of which are connected to the inner space of the mixing barrel; The liquid injection mechanism comprises: A hard tube is inserted into the liquid inlet main pipe, with a gap between the hard tube and the liquid inlet main pipe; The first stop valve is installed on the hard pipe; The liquid injection pipeline has an inlet and an outlet of the liquid injection pipeline, the inlet of the liquid injection pipeline is used to connect to the corresponding material source, and the outlet of the liquid injection pipeline is connected to the hard pipe. The liquid injection pipeline has a plurality of control branches arranged in parallel, each control branch is provided with a control valve, and the flow rates of the control valves on different control branches are different; A syringe, comprising a barrel and an injection needle, wherein the injection needle is inserted into the auxiliary liquid inlet tube, and a gap is provided between the injection needle and the auxiliary liquid inlet tube; A second stop valve, mounted on the injection needle; A liquid infusion tube, one end of which is connected to the lower part of the internal space of the syringe, and the other end of which is used to connect to a corresponding material source; A third stop valve is installed on the liquid infusion pipe; A piston rod assembly, comprising a piston portion and a rod portion connected to each other, wherein the piston portion is slidingly and sealingly mounted in the syringe; An electric push rod cooperates with the rod portion and is used to drive the piston rod assembly to move downward.

[0006] A working method of a high-precision liquid quality control device: the first injection mechanism works to open different control valves in order from large flow to small flow. Each time the control valve is opened, the weighing mechanism records the weight in real time until the increased weight reaches the value range corresponding to the corresponding control valve, and then the corresponding control valve is closed. When the control valve with the smallest flow is closed, the electric push rod works to push the piston downward, so that the liquid in the cylinder is injected into the mixing barrel until the increased weight recorded by the weighing mechanism reaches the set value. For example, if there are two control branches, and the first injection mechanism needs to add Xg of A liquid, when working, first open the control valve with large flow (the other control valves are closed at this time) to quickly add liquid, until the value displayed by the weighing mechanism increases by (80.0%~90.0%)Xg (in actual use, the specific percentage can be set as needed), then open the control valve with small flow (the other control valves are closed at this time) to add liquid, until the value displayed by the weighing mechanism increases to (99.0~99.9%)Xg (in actual use, the specific percentage can be set as needed), finally, close all the control valves, and inject the A liquid in the syringe into the mixing barrel by pushing the electric push rod (the second stop valve is opened and the third stop valve is closed at this time), until the value displayed by the weighing mechanism increases to Xg, the injection of the first injection mechanism is completed, and then, close the second stop valve, open the third stop valve, and add A liquid into the cylinder through the liquid replenishment tube.

[0007] According to the working mode of the first liquid injection mechanism, the other liquid injection mechanisms work one by one (that is, after one liquid injection mechanism completes filling of the corresponding liquid, another liquid injection mechanism fills the corresponding liquid) until the filling of all liquids is completed.

[0008] The present application sets control valves with different flow rates and opens different control valves in sequence from large flow rate to small flow rate during operation, which can effectively improve the efficiency of liquid addition, and finally pushes the liquid in the syringe into the mixing barrel through the electric push rod to achieve the final precise injection, ensuring high-precision liquid quality control. Furthermore, the present application has a gap between the hard tube and the liquid inlet main pipe, and a gap between the injection needle and the liquid inlet auxiliary pipe. This arrangement ensures that the injection mechanism will not affect the quality of the mixing barrel, and can ensure high-precision liquid quality control.

[0009] In actual use, the high-precision liquid quality control device also includes a bracket independent of the mixing barrel, the hard tube is fixed to the bracket through a first connecting part, and the cylinder is fixed to the bracket through a second connecting part.

[0010] In actual use, there can be two injection mechanisms, one for delivering solute and the other for delivering solvent. There can be two or three control branches.

[0011] In one embodiment of the present invention, the liquid injection mechanism further includes: First air pump; A first airbag is installed on the outer side wall of the hard tube, the first airbag is located between the hard tube and the liquid inlet main pipe, the first airbag is connected to the first air pump through an air pipe, and the first airbag is used to make the hard tube and the liquid inlet main pipe seal and cooperate; Second air pump; The second airbag is installed on the outer wall of the injection needle. The second airbag is located between the injection needle and the auxiliary liquid inlet tube. The second airbag is connected to the second air pump through the air tube. The second airbag is used to make the injection needle and the auxiliary liquid inlet tube seal each other.

[0012] In actual use, the first air pump and the second air pump can be operated after the mixing of the liquids is completed to expand the first airbag and the second airbag, the first airbag makes the hard tube and the liquid inlet main tube seal together, the second airbag makes the injection needle and the liquid inlet auxiliary tube seal together, thereby sealing the gap, and the mixed liquid is in a closed space, which can prevent the volatilization of volatile liquids.

[0013] In actual use, the first and second airbags can be expanded before mixing the liquid. After the last control valve (the control valve with the smallest flow rate) is closed, the liquid injection mechanism shrinks the first airbag and then expands it (the purpose is to eliminate the influence of the friction between the first airbag and the liquid inlet main pipe on the measurement accuracy of the weighing mechanism). When the electric push rod is working, the second airbag shrinks first, and then expands after the electric push rod is finished working. This setting can reduce the volatile amount of volatile liquid compared to expanding the two airbags at the end.

[0014] Furthermore, pressure gauges are provided in the first airbag and the second airbag. Before liquid injection, the pressure in the two airbags is set to N. At this time, the first airbag is in slight contact with the liquid inlet main pipe, and the second airbag is in slight contact with the liquid inlet auxiliary pipe (when in slight contact, the volatilization of the liquid can be prevented, and the influence on the measurement accuracy of the weighing mechanism can be basically ignored). After the liquid injection is completed, the pressure in the two airbags is set to M, M is greater than N. At this time, the first airbag is in close contact with the liquid inlet main pipe, and the two have good sealing properties. The second airbag is in close contact with the liquid inlet auxiliary pipe, and the two have good sealing properties.

[0015] In one embodiment of the present invention, the electric push rod is located above the rod portion, the movable rod of the electric push rod is used to contact and cooperate with the rod portion, and one end of the rod portion that cooperates with the electric push rod has a pressure sensor.

[0016] In one embodiment of the present invention, the electric push rod is located above the rod portion, the movable rod of the electric push rod is used to contact and cooperate with the rod portion, and one end of the movable rod of the electric push rod that cooperates with the rod portion has a pressure sensor.

[0017] Before the cylinder is filled with material, the movable rod of the electric push rod first moves up and resets, then closes the second stop valve, opens the third stop valve, and fills liquid A into the cylinder through the liquid filling tube. At this time, the piston is pressed to drive the rod to move up until the rod and the movable rod contact, and the pressure measured by the pressure sensor exceeds the set threshold. At this time, the third stop valve is controlled to close.

[0018] In one embodiment of the present invention, one end of the liquid infusion tube away from the cylinder is connected to the liquid injection pipeline, and the connection point is between the control branch and the inlet of the liquid injection pipeline.

[0019] In one embodiment of the present invention, a shell is further included, and the weighing mechanism, the mixing barrel and the liquid injection mechanism are arranged in the shell. Installing the weighing mechanism, mixing barrel and liquid injection mechanism in a relatively closed shell can prevent some liquid from evaporating into the workshop due to the existence of gaps during filling.

[0020] In one embodiment of the present invention, the housing has a waste pipe.

[0021] A small amount of gas volatilized into the shell can be discharged outside the shell through the exhaust pipe.

[0022] In one embodiment of the present invention, a section of the liquid injection pipeline connecting to the hard pipe is a flexible bellows.

[0023] In one embodiment of the present invention, the lower end of the mixing barrel is provided with a discharge pipe, the discharge pipe is provided with a valve, the discharge pipe is connected with an external conveying pipeline through a first pipeline, and the first pipeline is a flexible bellows.

[0024] The traditional pipe connection method is not flexible enough. The present application can facilitate the connection and prevent stress by providing a flexible bellows.

[0025] In one embodiment of the present invention, a control unit is further included, and the control unit is used to control the operation of multiple groups of injection units according to the data of the weighing unit.

[0026] In actual application, the stop valve, control valve and valve can be an electric control valve or a pneumatic control valve.

[0027] The beneficial effects of the present invention are as follows: the present application can effectively improve the efficiency of liquid addition by setting control valves of different flow rates and opening different control valves in sequence from large flow rate to small flow rate during operation, and finally the electric push rod is used to push the liquid in the syringe into the mixing barrel to achieve the final precise injection, thereby ensuring high-precision liquid quality control. Furthermore, the present application has a gap between the hard tube and the liquid inlet main pipe, and a gap between the injection needle and the liquid inlet auxiliary pipe. This arrangement ensures that the injection mechanism will not affect the quality of the mixing barrel, thereby ensuring high-precision liquid quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of a high-precision liquid quality control device; Figure 2 yes Figure 1 The enlarged view of point A in the middle; Figure 3 It is another schematic diagram of a high-precision liquid quality control device.

[0029] The reference numerals in the figures are: 1. Weighing mechanism; 2. Mixing barrel; 21. Liquid inlet structure; 211. Liquid inlet main pipe; 212. Liquid inlet auxiliary pipe; 22. Discharge pipe; 221. Valve; 23. Flexible bellows; 3. Liquid injection mechanism; 31. Hard pipe; 311. First stop valve; 312. First airbag; 32. Liquid injection pipeline; 32a. Inlet of liquid injection pipeline; 32b. Outlet of liquid injection pipeline; 321. Control branch; 3211. Control valve; 33. Syringe; 331. Cylinder; 332. Injection needle; 3321. Second air bag; 333. Second stop valve; 34. Infusion tube; 341. Third stop valve; 35. Piston rod assembly; 351. Piston part; 352. Rod part; 3521. Pressure sensor; 36. Electric push rod; 361. Movable rod; 37. First air pump; 38. Second air pump; 4. Delivery pipeline; 5. Shell; 51. Waste discharge pipe. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The present invention is described in detail below in conjunction with the accompanying drawings.

[0034] like Figure 1 and 2 As shown, a high-precision liquid quality control device comprises a weighing mechanism 1, a mixing barrel 2, and a plurality of liquid injection mechanisms 3 connected to the mixing barrel 2, wherein different liquid injection mechanisms 3 are used to convey different liquids, the mixing barrel 2 is placed on the weighing mechanism 1, and the upper end of the mixing barrel 2 is provided with a plurality of groups of liquid inlet structures 21, each liquid inlet structure 21 is matched with each liquid injection mechanism 3 in a one-to-one manner, and each group of liquid inlet structures 21 comprises a liquid inlet main pipe 211 and a liquid inlet auxiliary pipe 212 both of which are connected to the internal space of the mixing barrel 2; The injection mechanism 3 comprises: The hard tube 31 is inserted into the liquid inlet main tube 211, and there is a gap between the hard tube 31 and the liquid inlet main tube 211; A first stop valve 311 is installed on the hard pipe 31; The liquid injection pipeline 32 has an inlet 32a and an outlet 32b of the liquid injection pipeline. The inlet 32a of the liquid injection pipeline is used to connect to the corresponding material source. The outlet 32b of the liquid injection pipeline is connected to the hard pipe 31. The liquid injection pipeline 32 has a plurality of control branches 321 arranged in parallel. Each control branch 321 is provided with a control valve 3211. The flow rates of the control valves 3211 on different control branches 321 are different. The syringe 33 comprises a barrel 331 and a liquid injection needle 332. The liquid injection needle 332 is inserted into the liquid inlet auxiliary tube 212, and a gap is formed between the liquid injection needle 332 and the liquid inlet auxiliary tube 212. A second stop valve 333, mounted on the injection needle 332; A liquid infusion tube 34, one end of which is connected to the lower part of the internal space of the syringe 33, and the other end of which is used to connect to a corresponding material source; A third stop valve 341 is installed on the liquid infusion pipe 34; The piston rod assembly 35 comprises a piston portion 351 and a rod portion 352 connected to each other, and the piston portion 351 is slidably and sealingly installed in the syringe 33; The electric push rod 36 cooperates with the rod portion 352 to drive the piston rod assembly 35 to move downward.

[0035] A working method of a high-precision liquid quality control device: the first injection mechanism 3 works, and different control valves 3211 are opened in sequence from large flow rate to small flow rate. Each time the control valve 3211 is opened, the weighing mechanism 1 records the weight in real time until the increased weight reaches the value range corresponding to the corresponding control valve 3211, and then the corresponding control valve 3211 is closed. When the control valve 3211 with the smallest flow rate is closed, the electric push rod 36 works to push the piston part 351 downward, so that the liquid in the cylinder 331 is injected into the mixing barrel 2, until the increased weight recorded by the weighing mechanism 1 reaches the set value. For example, if there are two control branches 321, and the first injection mechanism 3 needs to be filled with liquid A of Xg, when working, first open the control valve 3211 with a large flow rate (at this time, other control valves 3211 are closed) to quickly add liquid until the value displayed by the weighing mechanism 1 increases by (80.0%~90.0%)Xg (in actual use, the specific percentage can be set as needed), and then open the control valve 3211 with a small flow rate (at this time, other control valves 3211 are closed) to add liquid until the value displayed by the weighing mechanism 1 increases to ( 99.0~99.9%)Xg (in actual use, the specific percentage can be set as needed), finally, close all the control valves 3211, and inject the A liquid in the syringe 33 into the mixing barrel 2 by pushing the electric push rod 36 (at this time, the second stop valve 333 is opened and the third stop valve 341 is closed), until the value displayed by the weighing mechanism 1 increases to Xg, the first injection mechanism 3 is injected. Then, close the second stop valve 333, open the third stop valve 341, and replenish the A liquid into the cylinder 331 through the liquid replenishing tube 34.

[0036] According to the working mode of the first liquid injection mechanism 3, the other liquid injection mechanisms 3 work one by one (that is, after one liquid injection mechanism 3 finishes filling the corresponding liquid, another liquid injection mechanism 3 fills the corresponding liquid) until the filling of all liquids is completed.

[0037] The present application can effectively improve the efficiency of liquid addition by setting control valves 3211 with different flow rates and opening different control valves 3211 in sequence from large flow rate to small flow rate during operation, and finally the electric push rod 36 pushes the liquid in the syringe 33 into the mixing barrel 2 to achieve the final precise injection, ensuring high-precision liquid quality control. Furthermore, the present application has a gap between the hard tube 31 and the liquid inlet main pipe 211, and a gap between the injection needle 332 and the liquid inlet auxiliary pipe 212. This arrangement ensures that the injection mechanism 3 will not affect the quality of the mixing barrel 2, and can ensure high-precision liquid quality control.

[0038] In actual use, the high-precision liquid quality control device also includes a bracket independent of the mixing barrel 2 (omitted and not shown in the figure), the hard tube 31 is fixed to the bracket through a first connecting part (omitted and not shown in the figure), and the cylinder 331 is fixed to the bracket through a second connecting part (omitted and not shown in the figure).

[0039] In this embodiment, there may be two liquid injection mechanisms 3, one for delivering solute and the other for delivering solvent. There are two control branches 321.

[0040] like Figure 2 As shown, in this embodiment, the liquid injection mechanism 3 also includes: A first air pump 37; The first airbag 312 is installed on the outer wall of the hard tube 31. The first airbag 312 is located between the hard tube 31 and the liquid inlet main pipe 211. The first airbag 312 is connected to the first air pump 37 through the air pipe. The first airbag 312 is used to make the hard tube 31 and the liquid inlet main pipe 211 seal with each other; A second air pump 38; The second airbag 3321 is installed on the outer wall of the injection needle 332. The second airbag 3321 is located between the injection needle 332 and the liquid inlet auxiliary tube 212. The second airbag 3321 is connected to the second air pump 38 through the air tube. The second airbag 3321 is used to make the injection needle 332 and the liquid inlet auxiliary tube 212 seal.

[0041] In actual use, the first air pump 37 and the second air pump 38 can be operated after the mixing is completed to expand the first airbag 312 and the second airbag 3321. The first airbag 312 makes the hard tube 31 and the liquid inlet main pipe 211 seal together, and the second airbag 3321 makes the injection needle 332 and the liquid inlet auxiliary pipe 212 seal together, thereby sealing the gap and injecting the mixed liquid in a closed space, which can prevent the volatilization of volatile liquid.

[0042] In actual use, the first airbag 312 and the second airbag 3321 can be expanded before mixing the liquid. After the last control valve 3211 (the control valve 3211 with the smallest flow rate) is closed, the liquid injection mechanism 3 shrinks the first airbag 312 and then expands the first airbag 312 (the purpose is to eliminate the influence of the friction between the first airbag 312 and the liquid inlet main pipe 211 on the measurement accuracy of the weighing mechanism 1). When the electric push rod 36 of the liquid injection mechanism 3 is working, the second airbag 3321 shrinks first, and after the electric push rod 36 is finished working, the second airbag 3321 is expanded. Compared with expanding the two airbags at the end, this setting can reduce the volatilization amount of the volatile liquid.

[0043] Furthermore, pressure gauges are provided in the first airbag 312 and the second airbag 3321. Before liquid injection, the pressure in the two airbags is set to N. At this time, the first airbag 312 is in slight contact with the liquid inlet main pipe 211, and the second airbag 3321 is in slight contact with the liquid inlet auxiliary pipe 212 (when in slight contact, the volatilization of the liquid can be prevented, and the influence on the measurement accuracy of the weighing mechanism 1 can be basically ignored). After the liquid injection is completed, the pressure in the two airbags is set to M, M is greater than N. At this time, the first airbag 312 is in close contact with the liquid inlet main pipe 211, and the two have good sealing properties. The second airbag 3321 is in close contact with the liquid inlet auxiliary pipe 212, and the two have good sealing properties.

[0044] like Figure 2 As shown, in this embodiment, the electric push rod 36 is located above the rod 352, and the movable rod 361 of the electric push rod 36 is used to contact and cooperate with the rod 352. The end of the rod 352 that cooperates with the electric push rod 36 has a pressure sensor 3521. In actual use, the end of the movable rod 361 of the electric push rod 36 that cooperates with the rod 352 can also have a pressure sensor 3521.

[0045] Before the cylinder 331 is replenished with material, the movable rod 361 of the electric push rod 36 first moves up and resets, then the second stop valve 333 is closed, the third stop valve 341 is opened, and liquid A is replenished into the cylinder 331 through the liquid replenishing tube 34. At this time, the piston part 351 is pressed to drive the rod part 352 to move upward until the rod part 352 and the movable rod 361 are in contact, and the pressure measured by the pressure sensor 3521 exceeds the set threshold value. At this time, the third stop valve 341 is controlled to be closed.

[0046] like Figure 1 As shown, in this embodiment, one end of the liquid infusion tube 34 away from the cylinder 331 is connected to the liquid injection pipeline 32, and the connection point is between the control branch 321 and the inlet 32a of the liquid injection pipeline.

[0047] like Figure 1As shown, in this embodiment, the section where the injection pipeline 32 is connected to the hard pipe 31 is a flexible bellows 23. The lower end of the mixing barrel 2 has a discharge pipe 22, and the discharge pipe 22 has a valve 221. The discharge pipe 22 is connected to the external conveying pipeline 4 through a first pipeline, and the first pipeline is a flexible bellows 23.

[0048] The traditional pipe connection method is not flexible enough. The present application can facilitate the connection and prevent stress by providing a flexible bellows 23.

[0049] In this embodiment, a control unit (omitted and not shown in the figure) is also included, and the control unit is used to control the operation of multiple groups of injection units according to the data of the weighing unit.

[0050] In actual use, the stop valve, the control valve 3211 and the valve 221 can be electrically controlled valves or pneumatically controlled stop valves.

[0051] In actual application, Figure 3 As shown, the high-precision liquid quality control device also includes a housing 5, a weighing mechanism 1, a mixing barrel 2 and a liquid injection mechanism 3 are arranged in the housing 5, and a waste pipe 51 is provided on the housing 5. The weighing mechanism 1, the mixing barrel 2 and the liquid injection mechanism 3 are installed in a relatively closed housing 5, which can prevent part of the liquid from volatilizing into the workshop due to the existence of gaps during filling, and a small amount of gas volatilized into the housing 5 can be discharged to the outside of the housing 5 through the waste pipe 51.

[0052] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention and the drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the present invention.

Claims

1. A high-precision liquid quality control device, comprising a weighing mechanism, a mixing barrel, and a plurality of liquid injection mechanisms connected to the mixing barrel, wherein different liquid injection mechanisms are used to deliver different liquids, and the mixing barrel is placed on the weighing mechanism, characterized in that: The upper end of the mixing barrel is provided with a plurality of liquid inlet structures, each of which corresponds to each liquid injection mechanism, and each of which includes a liquid inlet main pipe and a liquid inlet auxiliary pipe both of which are connected to the internal space of the mixing barrel; The liquid injection mechanism comprises: A hard tube is inserted into the liquid inlet main pipe, with a gap between the hard tube and the liquid inlet main pipe; The first stop valve is installed on the hard pipe; The liquid injection pipeline has an inlet and an outlet of the liquid injection pipeline, the inlet of the liquid injection pipeline is used to connect to the corresponding material source, and the outlet of the liquid injection pipeline is connected to the hard pipe. The liquid injection pipeline has a plurality of control branches arranged in parallel, each control branch is provided with a control valve, and the flow rates of the control valves on different control branches are different; A syringe, comprising a barrel and an injection needle, wherein the injection needle is inserted into the auxiliary liquid inlet tube, and a gap is provided between the injection needle and the auxiliary liquid inlet tube; A second stop valve, mounted on the injection needle; A liquid infusion tube, one end of which is connected to the lower part of the internal space of the syringe, and the other end of which is used to connect to a corresponding material source; A third stop valve is installed on the liquid infusion pipe; A piston rod assembly, comprising a piston portion and a rod portion connected to each other, wherein the piston portion is slidingly and sealingly mounted in the syringe; An electric push rod cooperates with the rod portion and is used to drive the piston rod assembly to move downward.

2. The high-precision liquid quality control device according to claim 1, characterized in that: The liquid injection mechanism also includes: First air pump; A first airbag is installed on the outer side wall of the hard tube, the first airbag is located between the hard tube and the liquid inlet main pipe, the first airbag is connected to the first air pump through an air pipe, and the first airbag is used to make the hard tube and the liquid inlet main pipe seal and cooperate; Second air pump; The second airbag is installed on the outer wall of the injection needle. The second airbag is located between the injection needle and the auxiliary liquid inlet tube. The second airbag is connected to the second air pump through the air tube. The second airbag is used to make the injection needle and the auxiliary liquid inlet tube seal each other.

3. The high-precision liquid quality control device according to claim 1, characterized in that: The electric push rod is located above the rod portion, the movable rod of the electric push rod is used for contacting and cooperating with the rod portion, and one end of the rod portion cooperating with the electric push rod is provided with a pressure sensor.

4. The high-precision liquid quality control device according to claim 1, characterized in that: The electric push rod is located above the rod portion, the movable rod of the electric push rod is used for contacting and cooperating with the rod portion, and one end of the movable rod of the electric push rod cooperating with the rod portion is provided with a pressure sensor.

5. The high-precision liquid quality control device according to claim 3 or 4, characterized in that: One end of the liquid infusion tube away from the cylinder is connected to the liquid injection pipeline, and the connection point is between the control branch and the inlet of the liquid injection pipeline.

6. The high-precision liquid quality control device according to claim 1, characterized in that: It also includes a shell, and the weighing mechanism, the mixing barrel and the liquid injection mechanism are arranged in the shell.

7. The high-precision liquid quality control device according to claim 6, characterized in that: The shell body is provided with a waste discharge pipe.

8. The high-precision liquid quality control device according to claim 1, characterized in that: The section of the liquid injection pipeline that connects with the hard pipe is a flexible corrugated pipe.

9. The high-precision liquid quality control device according to claim 1, characterized in that: The lower end of the mixing barrel is provided with a discharge pipe, on which a valve is provided. The discharge pipe is connected with an external conveying pipeline through a first pipeline, and the first pipeline is a flexible corrugated pipe.

10. The high-precision liquid quality control device according to claim 1, characterized in that: It also includes a control unit, which is used to control the operation of multiple groups of liquid injection units according to the data of the weighing unit.

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