CN109178376B - Filling pressure control method and equipment - Google Patents
Filling pressure control method and equipment Download PDFInfo
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- CN109178376B CN109178376B CN201811217650.6A CN201811217650A CN109178376B CN 109178376 B CN109178376 B CN 109178376B CN 201811217650 A CN201811217650 A CN 201811217650A CN 109178376 B CN109178376 B CN 109178376B
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- 238000011049 filling Methods 0.000 title claims abstract description 171
- 238000000034 method Methods 0.000 title claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 135
- 239000003814 drug Substances 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims description 25
- 238000001802 infusion Methods 0.000 claims description 25
- 239000013589 supplement Substances 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 8
- 230000006837 decompression Effects 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009469 supplementation Effects 0.000 description 2
- 238000012371 Aseptic Filling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
- B65B3/04—Methods of, or means for, filling the material into the containers or receptacles
- B65B3/10—Methods of, or means for, filling the material into the containers or receptacles by application of pressure to material
- B65B3/14—Methods of, or means for, filling the material into the containers or receptacles by application of pressure to material pneumatically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
- B65B3/003—Filling medical containers such as ampoules, vials, syringes or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
- B65B3/04—Methods of, or means for, filling the material into the containers or receptacles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B57/00—Automatic control, checking, warning, or safety devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
- B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
- B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
- B67C3/06—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus using counterpressure, i.e. filling while the container is under pressure
- B67C3/12—Pressure-control devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
- B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
- B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
- B67C3/22—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
- B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
- B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
- B67C3/22—Details
- B67C3/26—Filling-heads; Means for engaging filling-heads with bottle necks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
- B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
- B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
- B67C3/22—Details
- B67C3/28—Flow-control devices, e.g. using valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Basic Packing Technique (AREA)
- Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
Abstract
The invention provides a filling pressure control method and equipment, wherein an air inlet valve and an air outlet valve are arranged at the top of a buffer tank, a constant pressure device with a front buffer is arranged on an air inlet pipeline connected with the air inlet valve, one end of the air outlet valve is connected with the buffer tank, the other end of the air outlet valve is connected with a throttle valve for air exhaust, a filling liquid outlet is arranged at the bottom of the tank, a plurality of filling valves are arranged at the ends of the outlets, a pressure transmitter is arranged between the filling valves and the outlets of the buffer tank, a liquid inlet is arranged at one side of the lower part of the buffer tank, and a liquid inlet valve is arranged at the inlet. The pressure control method can realize multiple times of filling through one-time liquid supplementing, is not influenced by pressure fluctuation of a compressed air source and the liquid level height of the liquid medicine in the buffer tank, is high in filling speed and high in filling precision, and can improve the filling precision to be within +/-1%.
Description
Technical Field
The invention belongs to the field of automatic filling control, and particularly relates to a filling pressure control method and equipment.
Background
Aseptic filling technology is a new production technology produced in recent years, and an aseptic cold filling production line is produced accordingly. The blow-filling and sealing technology is an aseptic sealing technology, the equipment can usually produce dozens of (20-60) products at one time, and because the number of filling heads is large, in order to realize Cleaning In Place (CIP) and disinfection in place (SIP), the filling is usually carried out by adopting a time pressure method, namely, under a certain filling pressure, the filling amount is controlled by controlling the opening time of a filling valve.
The source of filling pressure usually adopts compressed air to pressurize in the liquid medicine buffer tank and realizes, thereby the inflated pressure in the buffer tank is adjusted directly to the filling equipment that blows usually, just a filling equipment has been revealed like prior art CN201620333432.9, concretely relates to a high accuracy filling system for blowing embedment all-in-one, including liquid medicine buffer tank and level gauge, the level gauge corresponds the setting of liquid medicine buffer tank for measure liquid medicine liquid level in the liquid medicine buffer tank, liquid medicine buffer tank top sets up into pencil, intake pipe and evacuation pipe respectively, it sets up into the medicine valve on the pencil to advance, set up admission valve and relief valve in the intake pipe, set up the evacuation valve on the evacuation pipe, liquid medicine buffer tank bottoms portion is connected to filling valves through the filling tank bottom pipe, and its pressure control method does: filling-liquid supplement (simultaneously exhausting air from an exhaust valve), pressurization (air supply from an air inlet valve) and filling.
However, the pressure control in this way is affected by the pressure fluctuation of the compressed air source and the height of the liquid level of the liquid medicine in the buffer tank, and the pressure gauge of the pressure reducing valve is inaccurate in pressure measurement during pressurization and air supplement, so the filling pressure is not high in precision, which can only reach ± 2.5% (the filling amount is less than 10 ml), and the precision of the filling pressure cannot meet the filling requirements of some special products.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a filling pressure control method and equipment thereof, wherein the pressure control method can realize repeated filling through one-time liquid supplement, is not influenced by pressure fluctuation of a compressed air source and the liquid level height of liquid medicine in a buffer tank, has high filling speed, and can break through the bottleneck of the existing filling pressure control through fine adjustment control of pressurization and depressurization, and the filling precision can be improved to be within +/-1% by adopting a new control method.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the invention provides a filling pressure control method, wherein an air inlet valve and an air outlet valve are arranged at the top of a buffer tank, a constant pressure device with a front buffer is arranged on an air inlet pipeline connected with the air inlet valve, one end of the air outlet valve is connected with the buffer tank, the other end of the air outlet valve is connected with a throttle valve for air exhaust, a filling liquid outlet is arranged at the bottom of the tank, a plurality of filling valves are arranged at the ends of the outlets, a pressure transmitter is arranged between the filling valves and the outlets of the buffer tank, a liquid inlet is arranged at one side of the lower part of the buffer tank, and a liquid inlet valve is arranged at the inlet, the pressure control method is characterized:
s1, early preparation stage: the set pressure value of the constant pressure equipment is higher than the gas pressure value in the buffer tank when the filling starting point exists, and the preset air inlet valve, the preset exhaust valve, the preset filling valve and the preset liquid inlet valve are all in a closed state;
s2, pressurizing stage: opening the air inlet valve, and closing the air inlet valve after the gas pressure in the buffer tank is stable;
s3, decompression stage: opening the exhaust valve until the pressure transmitter detects that the pressure value in the pipe is consistent with the filling set pressure value, and closing the exhaust valve;
s4, filling: controlling the filling valve to open for a certain time through the filling controller, quantitatively injecting filling liquid into a container below the filling valve, then judging whether the liquid level of the buffer tank reaches a preset lower limit value, if not, turning to the step S2 for pressurization and air supplement, and if so, executing the step S5 for liquid supplement;
s5, fluid infusion stage: if the liquid level of the buffer tank reaches the preset lower limit value, the liquid inlet valve and the liquid inlet valve at the liquid inlet are opened, liquid is injected into the buffer tank, and when the liquid level of the liquid reaches the preset upper limit value, the liquid inlet valve and the liquid inlet valve at the liquid inlet are closed to stop liquid inlet, and the step S3 is executed.
Further, the filling liquid in the buffer tank is specifically a liquid medicine.
Further, in step S2, the stable opening time of the intake valve for closing the intake valve after the gas pressure in the buffer tank is stable is 1 to 2S.
Further, the throttle valve is adjusted to a proper opening degree in step S1 so as to stabilize the pressure in the tank at the filling set pressure value within 1-2S in step S3.
Furthermore, the liquid level in the buffer tank is monitored through a weighing device, and the buffer tank is placed on the weighing device so as to judge whether the liquid level reaches the preset lower limit value and the preset upper limit value.
Further, the liquid level in the buffer tank is monitored through a liquid level meter so as to judge whether the liquid level reaches the preset lower limit value and the preset upper limit value.
Further, the specific type of the constant pressure equipment is a pressure reducing valve or a constant pressure tank.
Further, the number of the filling valves is 20-60.
Further, the set pressure value of the constant pressure equipment in the step S1 is 0.01 to 0.05bar greater than the pressure value of the gas in the buffer tank at the filling starting point.
Further, the filling controller is a PLC or a single chip microcomputer.
In addition, the present invention also provides a filling pressure control apparatus, the control apparatus including: at least one processor, and at least one memory communicatively coupled to the processor, wherein: the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform any of the pressure control methods described above.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
1) the method adopts a new two-stage pressure control method of pressurization and depressurization (fine adjustment, namely the pressure of the pressure reducing valve is slightly higher than the filling set pressure value during pressurization), the dead weight pressure of the liquid is fully considered, and the filling pressure precision can be ensured by a pressure transmitter with higher detection precision than that of a pressure gauge on the pressure reducing valve, so that the pressure control of the method is more accurate, and the pressure control precision can reach +/-0.001 bar;
2) the filling control method is different from the prior art: the method is characterized in that the operation of pressurizing-depressurizing is carried out before each filling, and the operation of depressurizing-pressurizing at the same time of liquid supplementing is carried out before each filling in the prior art, so the pressure control mode of the method avoids the influence of the pressure change at the rear end of a pressure reducing valve caused by the pressure fluctuation of a compressed air source on the filling pressure, a filling pressure detection point is positioned at a position near the upstream of a filling valve and already contains the pressure generated by the self weight of liquid medicine, the pressure control method is not influenced by the pressure fluctuation of the compressed air source and the liquid level height of the liquid medicine in a buffer tank, the pressure of the buffer tank is slightly higher than the filling pressure, and the exhaust speed is regulated slowly by a throttle valve in the exhaust process, so the filling pressure can be controlled to be a set value in a short time, the required preparation time before filling is shorter, the filling speed is high;
3) the fluid infusion control of this application is different: this application opens the admission valve in the fluid infusion, can discharge unnecessary gas through the overflow mouth of relief pressure valve and realize quick fluid infusion tonifying qi, consequently, the fluid infusion method fluid infusion of this application is accomplished the back pressure the same with the settlement pressure of relief pressure valve, and owing to through opening exhaust valve balanced pressure during prior art fluid infusion, the event all need pressurize once more after the fluid infusion of every turn and just can guarantee pressure, its prior art's pressure filling is that to mend a liquid and just can the filling once more at every turn, and the pressure filling of this application can realize many times filling through fluid infusion once, just need carry out the fluid infusion once more when the liquid level in the buffer tank reaches predetermined lower limit value, so the operation of this application is more simple and convenient.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a flow chart of a filling pressure control method of the present invention;
FIG. 2 is a schematic diagram of the filling pressure control system of the present invention;
FIG. 3 is a flow diagram of a pressurized phase medium of the filling pressure control system of the present invention;
FIG. 4 is a flow diagram of a depressurization phase medium of the filling pressure control system of the present invention;
FIG. 5 is a flow diagram of a filling phase medium of the filling pressure control system of the present invention;
fig. 6 is a flow diagram of a filling pressure control system during a fluid infusion phase of the present invention.
Description of reference numerals: BT1, liquid medicine buffer tank; WS1, electronic scale; v01, a liquid inlet valve; v02, intake valve; v03, exhaust valve; v04, throttle valve; V05-V10 and a filling valve; PR1, pressure relief valves; PG1, pressure gauge; PG2, pressure transmitter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in the flow chart of the filling pressure control method in fig. 1, an embodiment of the present invention discloses a filling pressure control method, in which an air inlet valve and an air outlet valve are arranged at the top of a buffer tank, a pre-buffering constant pressure device is arranged on an air inlet pipeline connected with the air inlet valve V01, one end of the air outlet valve is connected with the buffer tank, the other end of the air outlet valve is connected with a throttle valve for air exhaust, a filling liquid outlet is arranged at the bottom of the tank, a plurality of filling valves are arranged at the end of the outlet, a pressure transmitter is arranged between the filling valve and the outlet of the buffer tank, a liquid inlet is arranged at one side of the lower part of the buffer tank, and a liquid inlet valve is arranged at the inlet, and:
s1, early preparation stage: the set pressure value of the constant pressure equipment is higher than the set filling pressure value, and the preset air inlet valve, the preset exhaust valve, the preset filling valve and the preset liquid inlet valve are all in a closed state;
s2, pressurizing stage: opening the air inlet valve, and closing the air inlet valve after the gas pressure in the buffer tank is stable;
s3, decompression stage: opening the exhaust valve until the pressure transmitter detects that the pressure value in the pipe is consistent with the filling set pressure value, and closing the exhaust valve;
s4, filling: controlling the filling valve to open for a certain time through the filling controller, quantitatively injecting filling liquid into a container below the filling valve, judging whether the liquid level of the buffer tank reaches a preset lower limit value, jumping to the step S2 to perform pressurization and air supplementation if the liquid level of the buffer tank does not reach the preset lower limit value, and performing the step S5 to perform liquid supplementation if the liquid level of the buffer tank does not reach the preset lower limit value;
s5, fluid infusion stage: if the liquid level of the buffer tank reaches the preset lower limit value, the liquid inlet valve and the liquid inlet valve at the liquid inlet are opened, liquid is injected into the buffer tank, and when the liquid level of the liquid reaches the preset upper limit value, the liquid inlet valve and the liquid inlet valve at the liquid inlet are closed to stop liquid inlet, and the step S3 is executed.
Example two:
as shown in fig. 2-6, the present invention further describes the filling pressure control method in the above flowchart with reference to the states of each device during the preliminary preparation stage, the pressurization stage, the depressurization stage, the filling stage, and the fluid infusion stage.
As shown in fig. 2, the method of the present application is implemented in the filling pressure control system of fig. 2, which includes a buffer tank BT1, a liquid inlet valve V01, a gas inlet valve V02, a gas outlet valve V03, a throttle valve V04, a plurality of filling valves V05-V10, a pressure reducing valve PR1, a pressure gauge PG1, a pressure transmitter PG2, an electronic scale WS1, and a container, wherein the liquid buffer tank BT1 is placed on an electronic scale WS1, the liquid level in the liquid buffer tank BT1 can be monitored by weighing, the top of the buffer tank BT1 is provided with the gas inlet valve V1 and the gas outlet valve V1, wherein the gas inlet valve V1 is connected to the gas inlet pipe with the pressure reducing valve PR1, compressed air enters the gas inlet valve V1 through the pressure reducing valve PR1, the pressure reducing valve PR1 is provided with its own pressure gauge PG1, the PG1 is used for measuring the pressure at the downstream end of the PR exhaust valve 1, one end of the BT1 is connected to the other end of the buffer tank BT1, the throttle valve V04 is connected at the rear end of the V03, a filling liquid outlet is arranged at the bottom of the tank, a plurality of filling valves V05-V10 are arranged at the end of the outlet, a pressure transmitter PG2 is arranged between the filling valves V05-V10 (the number of the filling valves is usually 20-60) and the outlet of the buffer tank BT1, specifically, a pressure transmitter PG2 is arranged near the upstream position of the filling valves, a liquid inlet is arranged at one side of the left lower part of the buffer tank BT1, a liquid inlet valve V01 is arranged at the inlet, in addition, as shown in figure 2, the liquid can be liquid medicine, the container can be a medicine bottle, and the pressure reducing valve PR1 can be an overflow type pressure reducing valve.
Based on the schematic diagram of the filling control system in fig. 2, the invention adopts a mode of firstly replenishing air and then exhausting air into the buffer tank BT1 to ensure that the pressure at the starting point of each filling is consistent, and the exhaust loop adopts closed-loop control. Each air supply pressure is slightly higher than the set filling pressure, and then the pressure can be stabilized at the set pressure in a short time through the accurate control of the exhaust loop, so that the filling pressure can be accurately controlled, and the filling precision is improved, wherein the pressure control method comprises the following steps S1-S5, specific medium flow diagrams can be seen in FIGS. 3-6, and the steps S2-S5 are respectively corresponding to the steps S3-6:
s1, early preparation stage: the pressure reducing valve PR1 and the throttle valve V04 are opened all the time, the set pressure value of the pressure reducing valve PR1 is higher than the gas pressure value in the buffer tank by 0.01-0.05 bar when the set pressure value of the pressure transmitter PG2 is higher than the filling starting point (namely before the filling operation is started in the filling stage, the pressure indication of the pressure transmitter PG2 is equal to the filling set pressure value at the moment, the condition that the filling valve is opened for filling is met), the throttle valve V04 is adjusted to a proper opening degree to meet the condition that the filling pressure can be stabilized within 1-2 s, and the air inlet valve, the air outlet valve, the filling valve and the;
s2, pressurizing stage: referring to the medium flow diagram of the pressurization and air supplement operation in fig. 3, after the last filling stage is completed, namely after the filling valves V05-V10 are all closed, the air inlet valve V02 is immediately fully opened, and after 1-2S are stabilized, the air inlet valve V is closed, and at this time, the air pressure in the liquid buffer tank BT1 is the same as the pressure value set by the pressure reducing valve PR 1;
s3, decompression stage: referring to the medium flow diagram of the decompression exhaust operation of fig. 4, when the intake valve V01 and the intake valve V02 are in the closed state, and during the idle time of filling, the pressure value detected by the pressure transmitter PG2 is higher than the pressure value required to be displayed by the pressure transmitter PG2 at the filling starting point (hereinafter referred to as the filling set pressure value, the pressure value required to be displayed by the pressure transmitter PG2 at the filling starting point is a fixed value set according to the filling process requirement, and at the filling starting point, the filling set pressure value is equal to the sum of the gas pressure value in the buffer tank and the pressure value generated based on the self weight of the liquid medicine in step S1), the exhaust valve V03 is fully opened to slowly exhaust the excess air in the buffer tank BT1 through the exhaust valve V03 and the throttle valve V04, at which time the pressure detected by the pressure transmitter PG2 gradually drops, closing the exhaust valve V03 when the pressure value detected by the pressure transmitter PG2 is consistent with the filling set pressure value;
s4, filling: referring to the medium flow diagram of the filling operation in fig. 5, after the air intake valve V02 and the air exhaust valve V03 are both in a closed state, the filling valves V05 to V10 are controlled by a PLC controller or a single chip microcomputer to open for a certain time, so as to quantitatively inject the filling liquid into a container below the filling valves V, where the filling pressure is gradually reduced during the filling process, and then in the closed state of the filling valves, it is determined whether the liquid level of the buffer tank reaches a preset lower limit value by the electronic scale WS1, if not, the process jumps to step S2 to continue pressurization and air supplement, and if yes, the process executes step S5 to pressurize the liquid;
s5, fluid infusion stage: referring to the medium flow diagram of the liquid replenishing operation in fig. 6, in the closed state of the filling valve, if the liquid level detected by the electronic scale WS1 reaches a preset lower limit value, the liquid inlet valve V01 at the liquid inlet is opened, and at the same time, the air inlet valve V02 is opened, the liquid is injected into the buffer tank BT1, and at the same time, the air replenishing and pressurization are performed, at this time, the pressure in the buffer tank rises due to the addition of the liquid, if there is excess gas, the liquid passes through the air inlet valve V02 in a reverse direction and is then discharged through the overflow port of the pressure reducing valve PR1, when the liquid level of the liquid in the buffer tank BT1 reaches a preset upper limit value, the liquid inlet valve V01 and the air inlet valve V02 at the liquid inlet are closed to stop the liquid inlet, and at this time, the gas pressure in the buffer tank BT.
In addition, this application is except judging the liquid level through electronic scale WS1, also can judge the liquid level through the level gauge, and the level gauge can be present various level gauges, like pressure type, magnetic suspension formula, ultrasonic wave level gauge etc. and the relief pressure valve that exists as constant pressure equipment also can be replaced by the decompression constant pressure equipment such as constant pressure jar.
It is worth mentioning that the air supplementing stage and the air exhausting stage are required before each filling, the initial pressure before the filling is controlled by adopting a mode of firstly supplementing air and then exhausting air, the air exhausting process adopts closed-loop control to stabilize the filling pressure, the throttle valve V04 is arranged at the rear end of the exhaust valve V03, the air exhausting speed can be adjusted, and the liquid supplementing stage is only carried out when the liquid level in the buffer tank is too low, and liquid supplementing is not required before each filling.
In order to highlight the inventive concept of the present invention, the present invention takes the prior art CN201620333432.9 as a reference object, and it is emphasized again that the technical solution claimed in the present invention has the following advantages:
1) the novel two-stage pressure control method of pressurization and pressure reduction (fine adjustment, namely the pressure of the pressure reducing valve is slightly higher than the set filling pressure value during pressurization) is adopted, and the filling pressure precision can be ensured by a pressure transmitter with higher detection precision than that of a pressure gauge on the pressure reducing valve (the pressure gauge of the pressure reducing valve is low in detection precision, and the pressure transmitter is generally used as an independent detection device with higher detection precision), so that the pressure control of the pressure control method is more accurate, and the pressure control precision can reach +/-0.001 bar;
2) the filling control method is different from the prior art: the method is characterized in that the operation of pressurizing-depressurizing is carried out before each filling, and the operation of depressurizing-pressurizing at the same time of liquid supplementing is carried out before each filling in the prior art, so the pressure control mode of the method avoids the influence of the pressure change at the rear end of a pressure reducing valve caused by the pressure fluctuation of a compressed air source on the filling pressure, a filling pressure detection point is positioned at a position near the upstream of a filling valve and already contains the pressure generated by the self weight of liquid medicine, the method is not influenced by the pressure fluctuation of the compressed air source and the liquid level height of the liquid medicine in a buffer tank, the pressure of the buffer tank is slightly higher than the filling pressure, and the exhaust speed is adjusted by a throttle valve in the exhaust process, so the filling pressure can be accurately controlled to a filling set value in a short time, the preparation time required before filling is shorter, the filling speed is high, and the;
3) the fluid infusion control of this application is different: this application opens the admission valve in the fluid infusion, can discharge unnecessary gas through the overflow mouth of relief pressure valve and realize quick fluid infusion tonifying qi, consequently, the fluid infusion method fluid infusion of this application is accomplished the back pressure the same with the settlement pressure of relief pressure valve, and owing to through opening exhaust valve balanced pressure during prior art fluid infusion, the event all need pressurize once more after the fluid infusion of every turn and just can guarantee pressure, its prior art's pressure filling is that the fluid infusion can be filled once only with the benefit once, and the pressure filling of this application can realize many times filling through fluid infusion once, just need carry out the fluid infusion once more when the liquid level in the buffer tank reaches predetermined lower limit value, so the operation of this application is more simple and convenient.
The invention fully utilizes the control or detection characteristics of each device in the filling control system through the pressure control method, and fully organically combines the pressurization and depressurization method with the liquid supplementing method of the filling control system, thereby saving the operation procedure and improving the filling preparation time, and finally controlling the filling precision within +/-1 percent and the pressure control precision up to +/-0.001 bar by integrating all other factors.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a filling pressure control method, admission valve and discharge valve are established at the top of buffer tank, wherein dispose the constant voltage equipment of leading buffering on the admission line that the admission valve is connected, the buffer tank is connected to discharge valve one end, and the choke valve is connected in order to exhaust to the other end, and filling liquid export is established to the tank bottoms, and the export end sets up a plurality of filling valve, set up pressure transmitter between the export of filling valve and buffer tank, liquid entry is established to one side of buffer tank lower part, and the feed liquor valve is established to the entrance, its characterized in that, control method include following step S1 ~ S5:
s1, early preparation stage: the set pressure value of the constant pressure equipment is higher than the gas pressure value in the buffer tank when the filling starting point exists, and the preset air inlet valve, the preset exhaust valve, the preset filling valve and the preset liquid inlet valve are all in a closed state;
s2, pressurizing stage: opening the air inlet valve, and closing the air inlet valve after the gas pressure in the buffer tank is stable;
s3, decompression stage: opening the exhaust valve until the pressure transmitter detects that the pressure value in the pipe is consistent with the filling set pressure value, and closing the exhaust valve;
s4, filling: controlling the filling valve to open for a certain time through the filling controller, quantitatively injecting filling liquid into a container below the filling valve, then judging whether the liquid level of the buffer tank reaches a preset lower limit value, if not, turning to the step S2 for pressurization and air supplement, and if so, executing the step S5 for liquid supplement;
s5, fluid infusion stage: if the liquid level of the buffer tank reaches the preset lower limit value, the liquid inlet valve and the liquid inlet valve at the liquid inlet are opened, liquid is injected into the buffer tank, and when the liquid level of the liquid reaches the preset upper limit value, the liquid inlet valve and the liquid inlet valve at the liquid inlet are closed to stop liquid inlet, and the step S3 is executed.
2. The control method according to claim 1, wherein the filling liquid in the buffer tank is a liquid medicine.
3. The control method according to claim 1, wherein the intake valve closing time for closing the intake valve after the gas pressure in the surge tank is stabilized in step S2 is 1-2S.
4. The control method according to claim 1, wherein the throttle valve is adjusted to an appropriate opening degree in step S1 so as to stabilize the pressure in the tank at the filling set pressure value within 1-2S in step S3.
5. The control method according to claim 1, wherein the liquid level in the buffer tank is monitored by a weighing device, and the buffer tank is placed on the weighing device to determine whether the liquid level reaches the preset lower limit value and the preset upper limit value.
6. The control method according to claim 1, wherein the liquid level in the buffer tank is monitored by a liquid level meter to determine whether the liquid level reaches the preset lower limit value and the preset upper limit value.
7. The control method according to claim 1, wherein the constant pressure device is of a specific type of a pressure reducing valve or a constant pressure tank.
8. The control method according to claim 1, wherein the number of the filling valves is 20 to 60.
9. The control method according to claim 1, wherein the set pressure value of the constant pressure device in step S1 is 0.01 to 0.05bar greater than the pressure value of the gas in the buffer tank at the start of filling.
10. A filling pressure control apparatus, comprising:
at least one processor, and at least one memory communicatively coupled to the processor, wherein: the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the filling pressure control method of any one of claims 1-9.
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| CN110077638A (en) * | 2019-04-30 | 2019-08-02 | 楚天科技股份有限公司 | A kind of medical fluid automatic filling control system, bulking system and control method |
| CN110254770A (en) * | 2019-06-17 | 2019-09-20 | 江苏新美星包装机械股份有限公司 | A kind of sterile buffer tank filling containing fruit squash |
| CN111948112A (en) * | 2020-08-10 | 2020-11-17 | 盐城新海川机电科技有限公司 | Penetrating fluid constant-pressure quantitative supply method and device |
| CN112758372A (en) * | 2020-12-30 | 2021-05-07 | 武汉交通职业学院 | Automatic filling equipment for formed alkali liquor and filling method thereof |
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Application publication date: 20190111 Assignee: Changsha Pharmaceutical Equipment Industrial Technology Research Institute Co.,Ltd. Assignor: TRUKING TECHNOLOGY Ltd. Contract record no.: X2023980051833 Denomination of invention: A filling pressure control method and equipment Granted publication date: 20201020 License type: Common License Record date: 20231213 |
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