A liquid metering filling system

Abstract

The embodiment of the application provides a liquid metering and filling system, which comprises a system platform, a stirring tank arranged at a top position of the system platform, the stirring tank comprising a first liquid outlet arranged at a bottom; a metering device arranged at a middle position of the system platform, the metering device comprising a second liquid inlet and a second liquid outlet arranged at a top and a bottom respectively, the second liquid inlet being connected with the first liquid outlet in a pipeline manner, and the liquid being conveyed from the stirring tank to the metering device by gravity; and a temporary storage device arranged at a bottom position of the system platform, the temporary storage device comprising a third liquid inlet and a third liquid outlet arranged at a top and a bottom respectively, the third liquid inlet being connected with the second liquid outlet in a pipeline manner, and the third liquid outlet being connected with a liquid container in a pipeline manner through a third valve; and a control center for controlling automatic metering and filling of the liquid. The embodiment optimizes the overall layout of the liquid metering and filling system, reduces the use of energy, and lowers the production cost.

Description

Technical Field

[0001] This application relates to the field of liquid dispensing technology, and in particular to a liquid metering and dispensing system. Background Technology

[0002] A liquid metering and dispensing system is a device that dispenses liquids into a target container or system. Its main function is to control the liquid flow rate, dispensing volume, and dispensing speed to ensure accurate and efficient dispensing. Liquid metering and dispensing systems can be applied in technical fields such as chemical engineering, pharmaceuticals, and scientific research, playing an important role in production and experimental processes.

[0003] Liquid metering and dispensing systems consist of multiple sub-devices connected by pipes and valves. However, the unreasonable structural layout of these sub-devices leads to high energy consumption and high dispensing costs. Furthermore, current liquid metering and dispensing systems have low levels of automation, requiring manual intervention in the dispensing process, which further increases costs.

[0004] Liquid metering and dispensing systems are frequently used to dispense chemical solutions or liquid resins. Chemical solutions are volatile and have a strong odor, posing serious health risks if inhaled. Liquid resins are characterized by high viscosity, high chemical reactivity, and a tendency to react with air. The density and viscosity of liquid resins vary at different temperatures, which can lead to inaccurate metering when using volumetric measurement. Furthermore, liquid resins react with moisture in the air, causing clumping and severely impacting product quality. Existing liquid metering and dispensing systems fail to effectively address these issues. Summary of the Invention

[0005] To address the technical problems existing in the prior art, this application proposes a liquid metering and dispensing system that optimizes the overall layout of the liquid metering and dispensing system, thereby reducing energy consumption and lowering production costs. The liquid metering and dispensing system includes: a system platform, and further includes: a mixing tank, located at the top of the system platform, for mixing and mixing liquids, the mixing tank including a first outlet at the bottom; a metering device, located in the middle of the system platform, for weighing and metering the liquid, the metering device including a second inlet and a second outlet respectively located at the top and bottom, the second inlet being connected to the first outlet via a first valve, utilizing gravity to transport the liquid from the mixing tank to the metering device; a temporary storage device, located at the bottom of the system platform, for temporarily storing the weighed liquid, the temporary storage device including a third inlet and a third outlet respectively located at the top and bottom, the third inlet being connected to the second outlet via a second valve, the third outlet being connected to a liquid container via a third valve, dispensing the liquid into an external liquid container; and a control center, electrically connected to the first, second, and third valves respectively, the control center controlling the opening and closing of the first, second, and third valves to achieve automatic liquid metering and dispensing.

[0006] The liquid metering and dispensing system described above further includes: a blow valve is provided between the third liquid outlet and the liquid container, through which protective gas is blown into the third liquid outlet to increase the liquid flow rate.

[0007] In the liquid metering and dispensing system described above, one or more of the first valve, the second valve, and the third valve are pneumatic ball valves.

[0008] In the liquid metering and dispensing system described above, the nominal diameter of the third valve is DN50-DN80.

[0009] As described above, in the liquid metering and dispensing system, the mixing tank includes a tank body, the tank wall of which includes an inner layer and an outer layer, the inner layer and the outer layer being spaced apart to form a hollow interlayer, the hollow interlayer being filled with a medium to regulate the temperature inside the tank body.

[0010] As described above, in the liquid metering and filling system, when the weather temperature is lower than the first temperature threshold, the medium filled into the hollow interlayer is low-temperature resistant heat-conducting oil. A heating layer is provided on the outer wall of the outer layer, and an insulation layer is provided on the outside of the heating layer. The heat of the heating layer is transferred to the inner layer by the low-temperature resistant heat-conducting oil. The first temperature threshold is between -5℃ and 5℃.

[0011] In the liquid metering and dispensing system described above, when the weather temperature is higher than the second temperature threshold, the medium filled in the hollow interlayer is chilled water. The outer wall of the outer layer is provided with an insulation layer, a water inlet, and a water outlet. An external refrigeration device is connected to the water inlet and the water outlet respectively to introduce chilled water into the hollow interlayer. The chilled water circulates in the insulation layer to reduce the temperature in the inner layer. The second temperature threshold is between 30°C and 45°C.

[0012] As described above, the liquid metering and dispensing system includes a metering device comprising a flow control device and a metering tank connected to each other. The inlet of the flow control device is connected to the first outlet pipe via a first valve, and the second outlet is located at the bottom of the metering tank. The flow control device includes a first flow valve and a second flow valve, the outlets of which are respectively connected to the inlet pipe of the metering tank. The first flow valve has a larger flow rate than the second flow valve. When the liquid weight in the metering tank reaches a first advance amount, the control center controls the first flow valve to close; when the liquid weight in the metering tank reaches a second advance amount, the control center controls the second flow valve to close.

[0013] In the liquid metering and dispensing system described above, the first advance amount is less than the second advance amount, and both the first advance amount and the second advance amount are less than or equal to the target dispensing amount.

[0014] As described above, the liquid metering and dispensing system further includes a metering frame, on which the flow control device and the metering tank are mounted. The feet on the metering frame are fixed to the system platform using bolts and buffer springs. The buffer springs are sleeved on the bolts and located between the feet and the base to buffer the impact force when liquid is dispensed.

[0015] In the liquid metering and dispensing system described above, the stirring tank, metering device, and temporary storage device are each provided with an air inlet, through which a protective gas of a predetermined pressure value is introduced to isolate the liquid from air.

[0016] In the liquid metering and dispensing system described above, the predetermined pressure value is 0.01-0.04 MPa.

[0017] This application optimizes the overall layout of the liquid metering and dispensing system. It cleverly utilizes the gravity-driven flow of liquid to transport it from the mixing tank to the temporary storage device, eliminating the need for pressurized pump delivery, thus reducing energy consumption and lowering production costs. Furthermore, the control center independently controls the opening and closing of the first, second, and third valves to achieve automatic liquid metering and dispensing, automating the process, reducing manual intervention, and preventing harm to human health from the liquid. Attached Figure Description

[0018] The preferred embodiments of this application will now be described in further detail with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of a liquid metering and dispensing system according to an embodiment of this application.

[0020] Figure 2A This is a schematic diagram of the structure of a mixing tank according to an embodiment of this application.

[0021] Figure 2B This is a schematic diagram of the axial cross-sectional structure of a mixing tank according to an embodiment of this application.

[0022] Figure 3A This is a front structural schematic diagram of a metering device according to an embodiment of this application.

[0023] Figure 3B This is a side view of a metering device according to an embodiment of this application.

[0024] Figure 4 This is a schematic diagram of the structure of a flow control device according to an embodiment of this application.

[0025] Figure 5 This is a schematic diagram of the structure of a metering device assembly according to an embodiment of this application.

[0026] Figure 6 This is a flowchart of a measurement method according to an embodiment of this application.

[0027] Figure 7 This is a flowchart of a method for determining liquid weight according to an embodiment of this application.

[0028] Figure 8 This is a schematic diagram of a temporary storage device according to an embodiment of this application.

[0029] Figure 9 This is a schematic diagram of the gas path structure of the protective gas according to an embodiment of this application.

[0030] Figure 10 This is an embodiment of the automatic metering liquid dispensing method according to this application.

[0031] Figure 11 This is a schematic diagram of the production process according to an embodiment of this application.

[0032] Figure 12 This is a schematic flow diagram of a first manufacturing process according to an embodiment of this application.

[0033] Figure 13This is a schematic flow diagram of a second manufacturing process according to an embodiment of this application.

[0034] Figure 14 This is a schematic flow diagram of a third manufacturing process according to an embodiment of this application.

[0035] Figure 15 This is a schematic flow diagram of a fourth production process according to an embodiment of this application.

[0036] Explanation of reference numerals in the attached figures

[0037] 10. Liquid metering and filling system; 100. Mixing tank; 200. Metering device; 300. Temporary storage device; 400. Liquid container; 101. First outlet; 102. First valve; 201. Second inlet; 202. Second outlet; 203. Second valve; 301. Third inlet; 302. Third outlet; 303. Third valve; 103. Protective gas valve; 304. Purge valve; 110. Tank body; 120. Sealing cover; 130. Agitator; 111. Inner layer; 112. Outer layer; 113. Water inlet; 114. Water outlet; 115. Temperature sensor; 116. High liquid level sensor; 117. Low liquid level sensor; 121. Air inlet; 122. Liquid inlet; 123. Observation port; 124. 132. Silicone sealant; 23. Stirring motor; 24. Stirring shaft; 25. Impeller; 26. Reducer; 27. Sealing body; 28. Metering frame; 29. ​​Foot; 20. Buffer spring; 210. Flow control device; 221. Metering tank; 222. First flow valve; 223. Second flow valve; 224. Main pipeline; 225. Branch pipeline; 226. First manual valve; 227. Second manual valve; 238. Gravity sensor; 239. Tank body; 230. Sealing cover; 231. First opening; 232. Second opening; 233. Air inlet; 240. Metering device platform; 310. Temporary storage tank; 320. Sealing cover; 305. Air inlet; 306. Pressure reducing valve; 307. Main valve; 308. Valve. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] In the following detailed description, reference can be made to the accompanying drawings, which form part of this application and illustrate specific embodiments of the present application. In the drawings, similar reference numerals describe substantially similar components in different figures. Specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to implement the technical solutions of the present application. It should be understood that other embodiments may also be utilized, or structural, logical, or electrical changes may be made to the embodiments of the present application.

[0040] The liquid metering and dispensing system of this application can dispense liquid resin or chemical solution. Considering the characteristics of liquid resin and chemical solution as described in the aforementioned "Background Art," this application designs a liquid metering and dispensing system, redesigning a stirring tank with stirring and temperature control to ensure that the liquid resin reaches the required viscosity and temperature during metering and dispensing. Protective gas is pre-filled into the liquid metering and dispensing system to isolate the liquid resin from air, preventing chemical reactions and ensuring the quality of the liquid resin. The system's multiple operating nodes are controlled by a control center, achieving automatic transport, automatic weighing, and automatic dispensing functions without manual intervention, realizing a fully automated dispensing process. Furthermore, the multiple devices in the liquid metering and dispensing system adopt a modular assembly method, enabling the installation of this equipment on existing production lines, thereby reducing the difficulty of modification and upgrading and greatly saving installation and commissioning time. The specific structure of the liquid metering and dispensing system is described below.

[0041] Figure 1 This is a schematic diagram of a liquid metering and dispensing system according to an embodiment of this application. Figure 1 As shown, the liquid metering and dispensing system 10 includes one or more mixing tanks 100, one or more metering devices 200, and one or more temporary storage devices 300. One mixing tank 100, one metering device 200, and one temporary storage device 300 can form a liquid dispensing unit, which is used to dispense one type of liquid. The liquid metering and dispensing system 10 can include multiple liquid dispensing units to meet the requirements of dispensing multiple liquids in the manufacturing process. The mixing tank 100, metering device 200, and temporary storage device 300 are all mounted on a system platform (not shown). The system platform can be a frame structure composed of multiple platforms, and each platform can be equipped with one or more mixing tanks 100, one or more metering devices 200, or one or more temporary storage devices 300. The specific arrangement can be determined according to the actual needs of the site.

[0042] exist Figure 1In the illustrated embodiment, the mixing tank 100 is located at the top of the system platform, i.e., the top layer of the system platform. The mixing tank 100 is used to mix liquids. A first outlet 101 is provided at the bottom of the mixing tank 100, and a first valve 102 is provided at the first outlet 101. By controlling the opening and closing of the first valve 102, the outflow of liquid from the mixing tank can be controlled. The metering device 200 is located in the middle of the system platform, i.e., the middle layer of the system platform. The metering device 200 is used to weigh the liquid. The metering device 200 includes a second inlet 201 and a second outlet 202 respectively located at its top and bottom. The second inlet 201 is connected to the first outlet 101 via the first valve 102, and a second valve 203 is provided at the second outlet 202. The temporary storage device 300 is located at the bottom of the system platform, i.e., the bottom layer of the system platform. The temporary storage device 300 is used to temporarily store the weighed liquid. The temporary storage device 300 includes a third liquid inlet 301 and a third liquid outlet 302 disposed at its top and bottom. The third liquid inlet 301 is connected to the second liquid outlet 202 via a second valve 203, and the third liquid outlet 302 is connected to the liquid container 400 via a third valve 303, thereby adding liquid to the external liquid container 400.

[0043] The liquid metering and dispensing system 10 also includes a control center (not shown), which is electrically connected to the first valve 102, the second valve 203, and the third valve 303. The control center controls the opening and closing of the first valve 102, the second valve 203, and the third valve 303 to achieve automatic liquid metering and dispensing. This application utilizes the control center to monitor the working status of the mixing tank 100, the metering device 200, and the temporary storage device 300. By controlling the opening and closing of the first valve 102, the second valve 203, and the third valve 303, high-precision metering and a fully automated dispensing process are achieved, reducing manual intervention and lowering operating costs.

[0044] refer to Figure 1 The system platform is equipped with three sets of liquid dispensing devices: three mixing tanks 100 on the top layer, three metering devices 200 in the middle layer, and three temporary storage devices 300 on the bottom layer. The mixing tanks 100, metering devices 200, and temporary storage devices 300 in each liquid dispensing device are connected vertically by pipes. When the liquid metering and dispensing system 10 is operating, the first valve 102 is opened, allowing the liquid in the mixing tanks 100 to be transferred to the metering devices 200 by gravity. After metering is completed, the second valve 203 is opened, allowing the liquid to be transferred to the temporary storage devices by gravity. Finally, the third valve 303 is opened, allowing the liquid to be transferred to an external liquid container by gravity.

[0045] This application ingeniously utilizes the gravity-driven flow of liquids, placing the mixing tank, metering device, and temporary storage device at different heights on the system platform; specifically, the metering device is positioned below the mixing tank, and the temporary storage device is positioned below the metering device. In this way, the liquid is transported from the mixing tank to the temporary storage device using gravity, eliminating the need for pressurized pumping, reducing energy consumption, and lowering production costs.

[0046] According to one embodiment of this application, one or more of the first valve 102, the second valve 203, and the third valve 303 are pneumatic ball valves. Pneumatic ball valves have advantages such as good sealing performance, simple control, and low cost. The pipeline in this application mainly transports liquids, which may contain small clumps. If other types of valves are used, encountering clumps may lead to problems with valve closure. However, the pneumatic ball valve achieves opening and closing by rotating an internal ball, unaffected by clumps in the liquid. Furthermore, there is no significant change in internal resistance during opening and closing, maintaining a uniform liquid flow.

[0047] According to one embodiment of this application, the mixing tank, metering device, and temporary storage device are each further provided with an air inlet (not shown), through which a protective gas of a predetermined pressure is introduced to isolate the liquid from air. The predetermined pressure is 0.01-0.04 MPa. (Reference) Figure 1 Each air inlet is connected to a protective gas pipeline via a protective gas valve 103. Before adding liquid, protective gas is introduced to purge air from the mixing tank 100, metering device 200, and temporary storage device 300, preventing the liquid from reacting with air and degrading its quality. Protective gases include nitrogen, argon, and helium. Protective gases are generally inert gases, as they have low chemical reactivity, stable chemical properties, and do not participate in chemical reactions. Inert gases that are inexpensive to obtain, do not cause environmental pollution when released into the air, and are harmless to humans are suitable for use as protective gases. Preferably, nitrogen is used as the protective gas because it possesses the aforementioned advantages.

[0048] According to one embodiment of this application, a blow valve 304 is further provided between the third liquid outlet 302 and the liquid container 400. The blow valve 304 blows protective gas into the third liquid outlet 302 to increase the liquid flow rate. When the liquid viscosity is high and its own gravity cannot quickly transport the liquid to the liquid container, the blow valve 304 is opened to blow protective gas at a preset pressure value into the third liquid outlet 302, accelerating the liquid flow. The pressure value of the protective gas blown out by the blow valve 304 is 0.3 MPa-0.8 MPa.

[0049] Before addition, the solutions (such as liquid resins) in this application need to be thoroughly stirred to minimize clumping. Furthermore, the viscosity of liquid resins increases as temperature decreases, leading to decreased flowability, making effective transport impossible relying solely on gravity. Therefore, this application redesigns the mixing tank, incorporating a stirring function to ensure liquid uniformity. Additionally, a heating and cooling system is used to maintain the liquid inside the tank at an appropriate temperature, ensuring its flowability.

[0050] Figure 2A This is a schematic diagram of the structure of a mixing tank according to an embodiment of this application. Figure 2B This is a schematic diagram of the axial cross-sectional structure of a mixing tank according to an embodiment of this application. Figure 2A and Figure 2B As shown, the mixing tank 100 includes: a tank body 110, a sealing cover 120, and a stirrer 130, wherein the sealing cover 120 is sealed to the opening of the tank body 110, and the stirrer 130 is disposed on the sealing cover for stirring the liquid inside the tank body 110.

[0051] The tank wall of tank 110 includes an inner layer 111 and an outer layer 112, with the inner layer 111 and outer layer 112 spaced apart to form a hollow interlayer. This hollow interlayer is filled with a medium to regulate the internal temperature of tank 110. Depending on the ambient temperature at the installation site, the hollow interlayer can be filled with air, chilled water, or low-temperature heat-conducting oil to regulate the temperature of the liquid inside the tank. The material selection principles for the inner layer 111 and outer layer 112 are: sufficient strength, no chemical reaction with the internal liquid, and low manufacturing cost. Therefore, the materials for the inner layer 111 and outer layer 112 include, but are not limited to, 304 stainless steel and K235 steel.

[0052] When the ambient temperature exceeds a first temperature threshold, the hollow interlayer is filled with chilled water. The outer wall of the outer layer 112 is equipped with an insulation layer, an inlet 113, and an outlet 114. An external refrigeration unit is connected to the inlet 113 and outlet 114 to introduce chilled water into the hollow interlayer. The chilled water circulates within the hollow interlayer to lower the temperature of the liquid in the inner layer 111. The first temperature threshold is 30℃-45℃. For example, if the tank 110 contains liquid resin, when the ambient temperature exceeds 38℃, a 2-3 cm thick insulation layer is laid on the outer wall of the outer layer 112. An external refrigeration unit delivers chilled water through the inlet 113 into the hollow interlayer and out through the outlet 114, forming a circulating chilled water flow within the hollow interlayer to lower the temperature of the liquid resin inside the tank.

[0053] When the ambient temperature is below the second temperature threshold, the hollow interlayer is filled with low-temperature resistant heat-conducting oil. A heating layer is installed on the outer wall of the outer layer 112, and an insulation layer is installed outside the heating layer. The heat from the heating layer is transferred to the inner layer using the low-temperature resistant heat-conducting oil. The second temperature threshold is between -5℃ and 5℃. For example, if tank 110 contains liquid resin, in relatively high-latitude northern regions with low average temperatures, especially below 0℃ in winter, low-temperature resistant heat-conducting oil is filled into the hollow interlayer. An electric heating belt is wrapped around the outer layer, and a 2-3 cm thick insulation layer is installed to control the temperature of the liquid resin inside the tank when temperatures are low. The wrapped electric heating belt heats the metal of the outer layer 112, and the heat is transferred to the low-temperature resistant heat-conducting oil in the hollow interlayer, causing the heat-conducting oil to heat up and transfer the heat to the inner layer 111 and the contained liquid resin. The temperature sensor in the inner layer directly detects the temperature of the liquid resin inside the tank and controls the power supply of the heating belt according to the temperature set by the control center, thereby stabilizing the temperature of the liquid resin inside the tank.

[0054] This application utilizes low-temperature heat-conducting oil to heat the tank instead of water, to prevent the water inside the tank from freezing if it stops flowing. If water freezes in the hollow jacket, it could potentially rupture the tank and cause damage. Therefore, using low-temperature heat-conducting oil as the heating medium prevents damage to the tank and ensures its safety. Furthermore, this application designs the mixing tank as a double-layered tank with an inner and outer layer spaced apart, forming a hollow jacket. By filling the hollow jacket with chilled water or low-temperature heat-conducting oil, the liquid inside the tank can be cooled or heated. Maintaining the liquid inside the tank at a suitable temperature ensures both liquid quality and good fluidity.

[0055] like Figure 2A As shown, the upper surface of the sealing cap 120 is provided with an air inlet 121, a liquid inlet 122, and an observation port 123. The air inlet 121 is used to fill the tank 110 with protective gas. Liquid can be pumped into the tank by connecting the raw material tank to the liquid inlet 122 via a pipeline. Personnel can observe the internal condition of the tank through the observation port 123, especially during the liquid filling process, when it is necessary to observe the internal space of the tank. The observation port 123 includes two interlocking flanges, with a transparent sheet clamped between the two flanges and secured with bolts to prevent air leakage from the tank.

[0056] According to one embodiment of this application, the sealing cap 120 and the opening of the tank body 110 are connected using silicone sealant 124. To further ensure sealing, multiple through holes are provided at corresponding positions on the sealing cap 120 and the tank body 110, and bolts are used for fastening, strictly ensuring that no air leakage occurs at the connection of the tank body. This application uses standard bolt fasteners, which are both reliable and readily available, reducing manufacturing costs.

[0057] like Figure 2B As shown, the agitator 130 includes a stirring motor 131 and a stirring shaft 132. One end of the stirring shaft 132 passes through the sealing cover 120 and is fixedly connected to the stirring motor 131, while the other end is located inside the tank. Multiple blades 133 are mounted on the stirring shaft inside the tank. The stirring motor 131 drives the stirring shaft 132 to rotate, and the blades 133 on the stirring shaft 132 cause the liquid inside the tank to rotate, ensuring uniform liquid concentration and preventing sedimentation. Furthermore, a reducer 134 is provided between the stirring motor 131 and the stirring shaft 132. The reducer 134 is mounted on the rotating shaft of the stirring motor 131 to reduce the motor's speed and increase its torque. The reducer 134 is fixedly connected to the stirring shaft 132 near the end of the stirring motor 131, driving the stirring shaft 132 to rotate. To increase the sealing of the tank, a sealing body 135 is provided at the connection between the reducer 134 and the stirring motor 131. The sealing body 135 is fixedly connected to the sealing cover 120 and the reducer 134 respectively, which improves the sealing performance of the tank and prevents the tank from leaking.

[0058] This application adds a stirrer to the tank to ensure uniform mixing of the liquid and prevent clumping. Furthermore, the addition of a speed reducer increases the torque of the stirring shaft, preventing difficulties in rotation due to excessively high liquid viscosity and thus preventing motor malfunction. Moreover, this application adds a sealing element at the connection between the stirring shaft and the sealing cover, improving the tank's sealing performance.

[0059] refer to Figure 2A The tank 110 is also equipped with a temperature sensor 115, a high-level sensor 116, and a low-level sensor 117. All three are located on the outer wall of the tank 110 and extend into the tank. The temperature sensor 115 is electrically connected to the control center and is used to detect the temperature of the liquid inside the tank. The control center can heat or cool the tank based on the received temperature data to adjust the temperature of the liquid inside. The temperature sensor 115 can be a Pt100 resistance thermometer. The high-level sensor 116 is located at the upper part of the tank and extends into the tank. The temperature sensor 115 and the low-level sensor 117 are located at the lower part of the tank. The high-level sensor 116 and the low-level sensor 117 are electrically connected to the control center and are used to detect the liquid level inside the tank. When the high-level sensor 116 detects liquid, it indicates that the liquid level in the tank has reached its upper limit, and the filling of liquid is stopped. When the low liquid level sensor 117 detects that the liquid level is below its limit, it means that the liquid level in the tank has dropped to the lower limit position, so discharge is stopped and liquid can be added.

[0060] According to another embodiment of this application, temperature sensors are installed inside and outside the tank to detect the temperature of the liquid inside the tank and the temperature of the tank wall, respectively, so as to accurately control the temperature of the liquid with a control accuracy of ±2℃. In addition, temperature sensors are also installed on the tank walls of the metering tank and the temporary storage tank, and temperature sensors are also installed on the outer walls of the corresponding pipelines to detect their corresponding temperatures.

[0061] refer to Figure 2B Temperature sensor 115, high-level sensor 116, and low-level sensor 117 are spaced at a safe distance from the blade 133 to prevent damage from the rotation of the blade 133. Furthermore, a sufficient safe distance must also be maintained between the blade and the inner tank wall to prevent friction between the blade and the tank wall during operation. To provide sufficient operating space for the blade 133, the extension length of temperature sensor 115, high-level sensor 116, and low-level sensor 117 inside the tank can be shortened. Alternatively, temperature sensor 115, high-level sensor 116, and low-level sensor 117 can be positioned at different heights with multiple blades 133, ensuring they do not interfere with each other spatially. The safe distance is 4cm-8cm. When the spatial distance is less than 4cm, the kinetic energy from the rotating liquid, combined with the error-induced wobbling of the blade, may damage or affect the detection accuracy of nearby temperature sensor 115, high-level sensor 116, or low-level sensor 117. Therefore, the safe distance should be greater than 4cm.

[0062] According to one embodiment of this application, the safety distance is related to the type of liquid in the mixing tank. Specifically, the safety distance is related to parameters such as the liquid's density, viscosity, and solids content. For example, if the liquid is phenolic resin, which has a high viscosity, in order to provide greater shear force to achieve a better mixing effect, the safety distance should be minimized without affecting other sensors. Through simulation calculations, it was found that when the mixing tank contains high-viscosity phenolic resin, the safety distance is 4.5 cm, which can avoid damage to multiple sensors while providing a good mixing effect.

[0063] Figure 3A This is a front structural schematic diagram of a metering device according to an embodiment of this application. Figure 3B This is a side structural schematic diagram of a metering device according to an embodiment of this application. Figure 3A and Figure 3BAs shown, the metering device 200 includes a metering frame 210, a flow control device 220, and a metering tank 230. The metering frame 210 is a cubic structure composed of multiple support rods, used to support the flow control device 220 and the metering tank 230. The metering tank 230 is mounted on the metering frame 210 and located below the flow control device 220 via a gravity sensor 231. The gravity sensor 231 is electrically connected to a control center and is used to detect the weight of the liquid in the metering tank and send the weight data to the control center.

[0064] This application utilizes a gravity sensor instead of a volume sensor for measurement, avoiding the problem of inaccurate measurement by volume sensors due to changes in liquid volume caused by temperature variations, thus improving measurement accuracy. During the weighing process, the liquid weight is converted into a minute current or voltage signal that the control system can recognize, thereby realizing the weighing function.

[0065] like Figure 3A As shown, the flow control device 220 includes a first flow valve 221 and a second flow valve 222, where the first flow valve 221 has a larger flow rate than the second flow valve 222. The first flow valve 221 is connected to the outlet of the main pipeline 223, and the second flow valve 222 is connected to the outlet of the main pipeline 223 via a branch pipeline 224, the diameter of which is smaller than that of the main pipeline 223. The inlet of the main pipeline 223 is connected to the outlet of the mixing tank.

[0066] According to one embodiment of this application, the first flow valve 221 and the second flow valve 222 include pneumatic ball valves. The first flow valve 221 has a nominal diameter of DN25-DN50, and the second flow valve 222 has a nominal diameter of DN10-DN15. The nominal diameter of the first flow valve 221 is determined based on the maximum amount of liquid dispensed in a single operation, and the nominal diameter of the second flow valve 222 is determined based on the minimum amount of liquid dispensed in a single operation. For example, if the minimum single metering of liquid resin is 200g and the maximum is 10kg, then the first flow valve 221 can have a nominal diameter of DN32, and the second flow valve 222 can have a nominal diameter of DN15.

[0067] This application adds a flow control device to the metering apparatus. At the start of metering, both the first and second flow valves are opened simultaneously, allowing liquid to rapidly enter the metering tank. When the weight reaches the set advance amount, the first flow valve is closed, while the second flow valve remains open, continuing to feed into the metering tank. When the weight reaches the specified value, the second flow valve is closed. This solves the problem of exceeding the specified value due to untimely valve closure, which affects subsequent production process requirements. The flow control device both increases the liquid flow rate and achieves the required metering accuracy.

[0068] According to one embodiment of this application, the foot 211 on the metering frame 210 is fixed to the system platform using bolts (not shown) and a buffer spring 212. The buffer spring 212 is sleeved on the bolt and located between the foot 211 and the system platform to buffer the impact force when liquid enters. The metering frame 210 is movably connected to the system platform using bolts to prevent swaying. The buffer spring 212 plays a crucial role in metering, eliminating vibration and buffering the impact force during large-flow feeding. Numerous devices are installed on the system platform, such as various fans, vibrating equipment, and mixing equipment. These devices generate vibration, and since the system platform is a steel structure, this vibration is transmitted along the steel structure to the metering device, severely interfering with metering accuracy. By adding a buffer spring to the metering device, vibration interference can be eliminated. Furthermore, during large-flow feeding, a large amount of liquid enters the metering tank instantaneously, generating excessive impact force. The control center may misjudge that the set weight has been reached, while the actual weighing weight has not reached the set weight, causing system malfunctions and seriously affecting process production and product quality. Under the action of a large impact force, the buffer spring undergoes elastic deformation to absorb the impact energy and eliminate the adverse effects of the impact force.

[0069] Combination Figure 3A and Figure 3B As shown, the metering tank 230 includes a tank body 232 and a sealing cover 233. The sealing cover 233 is sealed to the opening of the tank body 232. The liquid inlet of the tank body 232 includes a first opening 234 and a second opening 235 provided on the sealing cover 233. The first opening 234 is connected to the first flow valve 221 via a pipe and is on the same axis. The second opening 235 is connected to the second flow valve 222 via a pipe and is on the same axis. If the first opening 234 and the first flow valve 221 are not on the same axis, the pipe needs to be bent for connection, thus preventing the liquid from flowing smoothly using gravity. Therefore, by ensuring that the first opening 234 and the first flow valve 221 are on the same axis, and the second opening 235 and the second flow valve 222 are on the same axis, smooth feeding is ensured, avoiding blockages or material accumulation.

[0070] According to one embodiment of this application, the outlets of the first flow valve 221 and the second flow valve 222 are respectively connected to the first opening 234 and the second opening 235 via silicone hoses. During the liquid metering process, as the liquid in the metering tank 230 gradually increases, the height of the metering tank 230 relative to the metering frame 210 decreases slightly. If the outlets of the first flow valve 221 and the second flow valve 222 are respectively connected to the first opening 234 and the second opening 235 via rigid pipes, it will exert a pulling force on the metering tank, affecting the accuracy of the gravity sensor. Therefore, by utilizing the deformable property of the silicone hose, when the metering tank 230 moves downward, the silicone hose will be stretched and lengthened, reducing the impact on the metering accuracy of the gravity sensor.

[0071] According to one embodiment of this application, the distance N between the centerlines of the outlets of the first flow valve 221 and the second flow valve 222 is 150mm-200mm. Preferably, the distance N is 180mm. Both the first flow valve 221 and the second flow valve 222 are fixed using flanges. If the distance is too small, there will be no space for assembly; if the distance is too large, it will waste materials and space. Therefore, a distance N of 150mm-200mm preserves assembly space while making reasonable use of space. Furthermore, the sealing cover 233 is also provided with an air inlet 236, through which protective gas can be introduced into the metering tank. The protective gas can vent the air in the metering tank, preventing the liquid from reacting chemically with the air and ensuring the quality of the liquid.

[0072] Figure 4 This is a schematic diagram of a flow control device according to an embodiment of this application. Figure 4 As shown, the flow control device 220 also includes a first manual valve 225 and a second manual valve 226. The first manual valve 225 is installed on the main pipe 223 and is used to open in case of abnormalities as a drain outlet. The second manual valve 226 is installed on the branch pipe 224 and is located upstream of the second flow valve 222. The second manual valve 226 can be a small-diameter pneumatic ball valve. When accurate liquid metering is required, the opening degree of the small-diameter manual ball valve is crucial. During commissioning, the opening degree of the small-diameter manual ball valve is adjusted so that the liquid flows slowly into the metering tank when open, in order to achieve the metering accuracy required by the process.

[0073] The first flow valve 221, the second flow valve 222, and the second manual valve 226 all adopt a wafer flange installation method and are connected using standard bolts. Both the flanges and standard bolts are national standard parts, offering advantages such as short procurement cycle, low cost, ease of use, standard dimensions, and quick disassembly and maintenance. A standard silicone gasket is used between the flange and the pneumatic ball valve to enhance sealing.

[0074] According to one embodiment of this application, the metering device further includes a flow meter (not shown), installed on the main pipeline 223, with its outlet connected to the inlet pipe of the flow control device, for measuring the volume of the liquid. Considering the high viscosity and large volume variation of the added liquid due to temperature, the weight of the liquid flowing into the metering tank is determined by combining the metering characteristics of the gravity sensor and the flow meter, significantly improving metering accuracy and meeting the process accuracy requirements. The following method will specifically describe the working steps of the flow meter and gravity sensor.

[0075] Figure 5 This is a schematic diagram of the structure of a metering device assembly according to an embodiment of this application. Figure 5 As shown, multiple metering devices 200 are arranged on a metering device platform 240 to form a metering device group. The metering device in this application is a miniaturized and modular design. By installing multiple metering devices on a single metering device platform, it is possible to simultaneously meter multiple liquids, thereby improving metering efficiency. At the same time, designing multiple metering devices together results in a compact layout and reduces the overall volume of the metering device group.

[0076] Figure 6 This is a flowchart of a measurement method according to an embodiment of this application. Figure 6 As shown, the metering method of this application based on the above-mentioned metering and refueling system includes:

[0077] In step S601, the first flow valve and the second flow valve are opened, and the liquid enters the metering tank through the flow meter, the first flow valve and the second flow valve;

[0078] In step S602, when the gravity sensor detects that the metering tank has reached the first advance amount, the first flow valve is closed;

[0079] In step S603, when the gravity sensor detects that the metering tank has reached the second advance amount, the second flow valve is closed; and

[0080] In step S604, the weight of the liquid in the metering tank is determined based on the flow rate value from the flow meter and the weight value detected by the gravity sensor.

[0081] After passing through the flow meter, the liquid enters the metering tank via either the first or second flow valve. The flow meter detects the volume of liquid flowing through the first and second flow valves. When the first and second flow valves are opened, the liquid rapidly enters the metering tank, reaching its maximum flow diameter and shortening the time it takes to enter the tank. By controlling the liquid flow rate using the first and second flow valves, metering accuracy can be improved to meet process requirements.

[0082] Furthermore, by using the flow rate and liquid density from the flow meter, the theoretical weight of the liquid can be calculated. The theoretical weight, together with the weight value detected by the gravity sensor, determines the weight of the liquid in the metering tank. This avoids the problem of inaccurate measurement caused by the failure of the gravity detection method, thus improving the accuracy and reliability of the measurement.

[0083] Figure 7 This is a flowchart of a method for determining liquid weight according to an embodiment of this application. Figure 7 As shown, in step S701, the flow rate value is obtained from the flow meter and the weight value is obtained from the gravity sensor;

[0084] In step S702, the temperature of the liquid is obtained using a temperature sensor, and the corresponding liquid density is obtained based on the liquid temperature;

[0085] In step S703, the theoretical weight value is calculated based on the flow rate and liquid density;

[0086] In step S704, the weight of the liquid in the metering tank is determined based on the theoretical weight value and the actual weight value.

[0087] The liquid volume in this application is greatly affected by temperature. Therefore, this application calculates the liquid weight by combining the liquid temperature, thereby improving the accuracy of the calculated value. Specifically, the liquid temperature can be obtained by a temperature sensor inside the mixing tank. The density value of the liquid at the current temperature can be obtained from the liquid temperature-density mapping table (as shown in Table 1 below). Then, the theoretical weight value is calculated based on the liquid density value and volume.

[0088] Table 1

[0089]

[0090] The weight of the liquid in the metering tank is determined using the following formula:

[0091] T1=V×ρ t (1)

[0092] MAX(∣T1-T2∣,Δ);(2)

[0093] Where T1 is the theoretical weight value, V is the volume detected by the flow meter, and ρ t T1 represents the density at the corresponding temperature, T2 represents the weight value detected by the gravity sensor, and Δ represents the error threshold.

[0094] Formula (2) can be used to compare the absolute value of the difference between the theoretical weight value T1 and the weight value T2 with the error threshold Δ. When the absolute value of the difference between the theoretical weight value T1 and the weight value T2 is less than the error threshold Δ, the average value of the theoretical weight value T1 and the weight value T2 is taken as the actual weight value of the liquid added to the metering tank. When the difference between the theoretical weight value T1 and the weight value T2 is greater than or equal to the error threshold, an alarm is issued to prompt staff to check and verify. This application takes into account the characteristic that the volume of liquid is easily affected by temperature, and introduces dynamic liquid density when calculating the theoretical weight value, thereby improving the calculation accuracy of the theoretical weight value.

[0095] Combining formulas (1) and (2) only calculates the weight of the liquid after it flows into the metering tank through the flow control device, and cannot accurately calculate the actual weight of the liquid in real time. This is because, during the liquid flow process, the liquid measured by the flow meter enters the metering tank only after passing through the first or second flow valve. Therefore, the sum of the liquid detected by the gravity sensor and the liquid measured by the first and / or second flow valves is the same as the weight of the liquid flowing through the flow meter. Therefore, when calculating the weight of the liquid in the metering tank in real time, it is necessary to add the weight of the liquid in the first and / or second flow valves to the weight value and then compare it with the theoretical weight value. That is, the theoretical weight value is calculated using the following formula:

[0096] The weight of the liquid in the metering tank is determined using the following formula:

[0097] T1=V×ρ t (3)

[0098] T3=T2+V0×ρ t (4)

[0099] MAX(∣T1-T3∣,Δ);(5)

[0100] Where T1 is the theoretical weight value, V is the volume detected by the flow meter, and ρ t The density corresponds to the temperature, T3 is the sum of the weight value detected by the gravity sensor and the liquid weight in the first flow valve and / or the second flow valve, T2 is the weight value detected by the gravity sensor, V0 is the liquid volume in the first flow valve and / or the second flow valve, and Δ is the error threshold.

[0101] Formula (5) can be used to compare the absolute value of the difference between the theoretical weight value T1 and the weight value T3 with the error threshold Δ. When the absolute value of the difference between the theoretical weight value T1 and the weight value T3 is less than the error threshold Δ, the average value of the theoretical weight value T1 and the weight value T3 is taken as the actual weight value of the liquid added to the metering tank. When the difference between the theoretical weight value T1 and the weight value T3 is greater than or equal to the error threshold Δ, an alarm is issued to prompt staff to check and verify.

[0102] The specific value of V0 will differ depending on whether the first flow valve and the second flow valve are open. By introducing the liquid volume V0 from the first flow valve and / or the second flow valve, the liquid weight flowing into the metering tank can be calculated in real time, further improving the accuracy of liquid weight measurement.

[0103] Figure 8 This is a schematic diagram of a temporary storage device according to an embodiment of this application. Figure 8 As shown, the temporary storage device 300 includes a temporary storage tank 310 and a sealing cover 320 disposed at the opening of the temporary storage tank 310. The sealing cover 320 is provided with a third liquid inlet 301 and an air inlet 305, and a third liquid outlet 302 is provided at the bottom of the temporary storage tank 310. The temporary storage tank 310 has the same structure as the metering tank described above, and will not be described again here. The temporary storage tank is used to temporarily store the metered liquid. When liquid needs to be added, the liquid in the temporary storage tank is added to the stirring device. The temporary storage device acts as a "transfer station" for the liquid, storing the metered liquid in the temporary storage tank. When multiple additions are required, it does not affect the liquid metering operation, ensuring the continuity of the process flow and improving work efficiency.

[0104] According to one embodiment of this application, the third outlet 302 at the bottom of the temporary storage tank 310 is connected to a liquid container pipeline via a third valve 303. The third valve 303 has a diameter of DN50-DN80. The third valve 303 uses a large-diameter valve, enabling rapid addition of liquid to the liquid container and shortening the addition time. The valve diameter can be determined based on the maximum amount of liquid to be added in a single operation. For example, if the maximum amount of liquid resin to be added in a single operation is 10 kg, then the third valve here is a DN50 valve.

[0105] This application's liquid metering and dispensing system, combined with a sand bin, sand heating device, and mixing device, can be used to produce petroleum sand, proppant, and coated sand. During production, the liquid metering and dispensing system allows various liquid resins, liquid mixtures, and liquid acid / alkali chemicals to be added to the sand mixer or mixing equipment according to the process flow, resulting in a physicochemical reaction. This ensures thorough and uniform mixing with sand at a specific temperature, allowing for uniform coating or foaming of the sand particles, enabling the sand to suspend in water without sinking. In petroleum sand and proppant, even within the same type, multiple models exist, each with different production processes, including varying mixing times, raw material dispensing rates, and cooling air frequency. If a single liquid metering and dispensing system can encompass all production processes for such products, it can meet all production needs after a single new equipment production line is built or an upgrade is implemented, demanding equipment flexibility. Flexibility means that updates to processes, adjustments to process parameters, and additions / reductions can be achieved without modifying the equipment and control system, enabling zero-cost process upgrades and product updates. To address the requirement for flexibility, this application designs all process nodes of the liquid metering and dispensing system as selectable, and parameters such as mixing time and injection volume can be adjusted and set according to process requirements. Furthermore, all process flows are automated, requiring no worker operation or intervention, reducing the labor intensity of workers and avoiding all the drawbacks of manual labor.

[0106] Figure 9 This is a schematic diagram of the gas path structure of a protective gas according to an embodiment of this application. Figure 9 As shown, the protective gas path is connected to multiple protective gas valves 103 and multiple injection valves 304. The protective gas source is connected via a main valve 307, which serves as the main switch. The protective gas source can provide protective gas with a pressure above 0.7 MPa, and the gas source pressure is stable enough to meet the long-term needs of the production unit. After the main valve 307, a pressure reducing valve 306 is connected to adjust the protective gas pressure to 0.3 MPa-0.8 MPa, preferably to 0.5 MPa. After the pressure reducing valve 306, two valves 308 are connected to divide the pipeline into two paths: one path is used by the injection valves 304; the other path passes through the pressure reducing valve 306 and is used by the protective gas valves 103 on the mixing tank, metering tank, and temporary storage tank. The protective gas can provide a slightly positive pressure gas environment to prevent air from entering the mixing tank, metering tank, and temporary storage tank, which would cause the liquid resin to deteriorate upon contact with air. The protective gas valve 103 operates at a gas pressure of 0.01 MPa-0.04 MPa, preferably 0.01 MPa. The pressure reducing valve 306 lowers the gas pressure to the target value, protecting the gas pipeline and preventing energy waste. Both the protective gas valve 103 and the jet valve 304 can be solenoid valves.

[0107] Figure 10 This is an embodiment of an automatic liquid metering dispensing method according to this application. For example... Figure 10 As shown, in step S100, the threshold N for the number of liquid injections and the target injection volume are set;

[0108] In step S200, the first advance amount and the second advance amount are calculated based on the target injection amount, and the first flow valve and the second flow valve are opened at the same time to deliver the liquid in the mixing tank to the metering tank.

[0109] In step S300, when the liquid in the metering tank reaches the first advance amount, the first flow valve is closed;

[0110] In step S400, when the liquid in the metering tank reaches the second advance amount, the second flow valve is closed;

[0111] In step S500, after the second flow valve is closed, the second valve between the metering tank and the temporary storage tank is opened to transfer the liquid in the metering tank to the temporary storage tank.

[0112] In step S600, after the second valve is closed, the third valve between the temporary storage tank and the liquid container is opened to add the liquid in the temporary storage tank into the liquid container of the external device.

[0113] In step S700, increment the number of fillings by 1 and determine if the number of fillings is less than N. If the number of fillings is less than N, return to step S200 to measure and fill the liquid. If the number of fillings is equal to N, it means that the filling of the liquid to be filled is complete, and then the process ends.

[0114] According to one embodiment of this application, before calculating the first and second advance amounts based on the target filling amount, the method further includes: opening the protective gas valves on the connecting pipes between the mixing tank, metering tank, and temporary storage tank, respectively, and filling the mixing tank, metering tank, and temporary storage tank with protective gas to purge air. The filling liquid of this application is chemically reactive and may undergo a chemical reaction upon contact with air, reducing its quality. Therefore, when necessary, protective gas is pre-filled into the mixing tank, metering tank, and temporary storage tank to prevent the liquid from contacting air.

[0115] In some production processes, the same liquid may need to be added multiple times. Therefore, the filling method of this application can pre-set process parameters such as the filling number threshold N and the target filling amount, and then perform metering and filling according to the set filling number to meet the requirements of the production process.

[0116] This application utilizes a first flow valve and a second flow valve to jointly control the flow rate of liquid entering the metering tank, achieving precise control over the weight of the liquid entering the tank. The first flow valve has a larger flow rate than the second flow valve. A first advance measure is less than a pre-set target filling amount. When the gravity sensor detects that the weight has reached the first advance measure, it indicates that the weight in the metering tank is close to the target filling amount, and the flow rate needs to be reduced to prevent the incoming liquid from exceeding the target filling amount. A second advance measure is less than or equal to the target filling amount. When the first flow valve is closed and the second flow valve is open, the liquid flows into the metering tank at a lower flow rate. When the weight of the liquid in the metering tank reaches the second advance measure, it indicates that the weight in the metering tank is very close to the target filling amount. After emptying the remaining liquid in the pipe between the second flow valve and the metering tank, the target filling amount is achieved.

[0117] According to one embodiment of this application, the viscosity of the liquid to be added is determined based on the temperature, density, and flow rate of the liquid to be added; and the values ​​of a first advance amount and a second advance amount are determined based on the viscosity of the liquid to be added; wherein the magnitudes of the first advance amount and the second advance amount are negatively correlated with the viscosity of the liquid to be added.

[0118] The lead time refers to the weight of the liquid in the metering tank when it is close to but has not yet reached the target filling volume. Taking corresponding actions in advance allows for adjustments to the liquid flow rate, preventing the input volume from exceeding the target filling volume and affecting subsequent production processes. First, a lead time coefficient S is determined based on the liquid's viscosity, where 0 < S ≤ 1. Then, the lead time is determined by multiplying the lead time coefficient S by the target filling volume. The lead time coefficient S differs between the first and second lead times. The magnitude of the lead time coefficient is negatively correlated with the viscosity of the liquid to be added; that is, the higher the viscosity of the liquid, the lower the lead time coefficient. Liquid viscosity is related to its temperature, density, and flow rate. This application calculates the lead time based on the type and density of the liquid to be added, the ambient temperature, and the flow rate, which can further improve the accuracy of the weight of the liquid input into the metering tank to meet production process requirements.

[0119] According to another embodiment of this application, the first advance amount is 80%-95% of the target refill volume, and the second advance amount is 98%-100% of the target refill volume. For example, if the target refill volume is 4.5 kg, then the first advance amount is 4 kg, and the second advance amount is 0.02 kg. Workers can select appropriate values ​​within the above range to meet the requirements of accurate measurement based on the type of liquid to be refilled.

[0120] According to one embodiment of this application, timing begins when the second flow valve is closed. After an interval of 5-10 seconds, the second valve between the metering tank and the temporary storage tank is opened to transfer the liquid from the metering tank to the temporary storage tank. In automated production processes, the control center triggers the start signal for the next process only upon receiving a signal from a specific node. Generally, the next process can be started upon completion of the previous production step. However, the metering and filling liquid in this application has unique characteristics. When the liquid is liquid resin, its viscosity is high, resulting in slow flow and temporary retention in the pipeline during transmission. Therefore, this application begins timing when the second flow valve is closed, and after an interval of 5-10 seconds, the second valve between the metering tank and the temporary storage tank is opened. This ensures that all the liquid temporarily retained in the second flow valve flows into the metering tank before the second valve is opened, guaranteeing that the liquid weight meets the process requirements during transmission.

[0121] According to one embodiment of this application, timing begins when the weight of the liquid in the metering tank is less than a weight threshold, and the second valve is closed after an interval of a second time threshold. The weight threshold is 0.01 kg to 0.03 kg, and the second time threshold is 3 seconds to 8 seconds. During the transfer of liquid from the metering tank to the storage tank, metering errors or liquid adhering to the inner wall of the metering tank may make it difficult for the gravity sensor to reach zero, or may require a long waiting time to reach zero. Therefore, the next process can proceed when the weight threshold is detected, balancing filling accuracy and work efficiency. Similarly, setting a second time threshold is also to ensure that the liquid in the metering tank is completely released as much as possible without affecting overall work efficiency.

[0122] According to one embodiment of this application, timing begins when the third valve between the temporary storage tank and the liquid container is opened, and the blowing valve is opened at intervals of a third time threshold, wherein the third time threshold is 1s-5s. When the liquid viscosity is too high, the blowing valve can be opened 1s-5s after the third valve is opened, using gas to quickly discharge the liquid and shorten the discharge time. Further, timing begins when the third valve between the temporary storage tank and the liquid container is closed, and the blowing valve is closed at intervals of a fourth time threshold, wherein the fourth time threshold is 5s-10s.

[0123] To more clearly illustrate the advantages that can be obtained from the embodiments of this application, the processing procedure of the embodiments of this application will be described in detail below based on specific examples.

[0124] This application takes the metering and dispensing of liquid resin A1 as an example to introduce the control process of a liquid metering and dispensing system. The control process is roughly divided into three steps: (1) charging protective gas; (2) loading liquid resin A1; (3) metering and dispensing liquid resin A1, the specific contents of which are as follows:

[0125] Before starting work, configure the process parameters for liquid resin A1. The configuration can be done automatically by the system based on the type of liquid to be added, or manually adjusted. The process parameters are as follows:

[0126] Single-use material weight setting (target filling amount): 4.5Kg

[0127] First advance lead: 4 kg

[0128] First advance advance (second advance advance): 0.02 kg

[0129] All quadratic correlation parameters are set to 0.00.

[0130] The material feeding and unloading time (first time threshold) is 8 seconds.

[0131] Empty weighing weight threshold: 0.01 kg

[0132] Nominal delay time (second time threshold): 5S

[0133] Temporary storage tank discharge time: 5 seconds

[0134] (1) Fill with protective gas

[0135] Before liquid resin A1 is loaded into the mixing tank, the control center opens the first valve, the first flow valve, the second flow valve, the second valve, and the third valve, and also opens the protective gas valve connected to the mixing tank, introducing protective gas at a pressure of approximately 0.01 MPa. This protective gas enters the mixing tank, the metering tank, the temporary storage tank, and the corresponding pipelines, displacing air and filling the entire tank and pipeline through which liquid resin A1 passes, thus achieving a protective effect. After 10 minutes of this process, the valves are closed.

[0136] (2) Fill with liquid resin A1

[0137] During the process of pumping liquid resin A1 from the raw material tank to the mixing tank A1, the volume of the protective gas in the mixing tank A1 is continuously compressed, and the pressure increases accordingly, making it more difficult to pump the resin from the raw material tank into the mixing tank A1. Therefore, the control center automatically switches the protective gas valve to the venting position, allowing the pressure inside the mixing tank A1 to be released (i.e., as the liquid resin A1 is pumped into the mixing tank A1, it forces the protective gas out of the mixing tank A1, thus maintaining a relative pressure balance inside and outside the mixing tank A1 during this process). When the high liquid level sensor in the mixing tank A1 detects a signal (i.e., the liquid level has reached the high level), the feed pump for liquid resin A1 is automatically shut off. At the same time, the control center automatically switches the protective gas valve to the working position and then introduces protective gas at a pressure of approximately 0.01 MPa to isolate the air. The control center starts the agitator A1 to mix the liquid resin A1 evenly. After 15 minutes of mixing, the control center automatically opens the first valve, at which point the system enters the preparation state.

[0138] (3) Metering and dispensing of liquid resin A1

[0139] The control center sends a metering signal for liquid resin A1, and the liquid resin A1 metering device will weigh it according to the set weight parameters. The first and second flow valves are automatically opened, quickly adding liquid resin A1 into metering tank A1. When the weight reaches one rapid advance advance, the control center automatically closes the first flow valve, entering slow advance mode. After reaching one slow advance advance, the control center automatically closes the second flow valve, completing the metering of liquid resin A1. The control center then automatically opens the second valve, transferring liquid resin A1 from metering tank A1 to storage tank A1. During the opening of the first and second flow valves, the control center automatically switches the protective gas valve connected to the metering tank to the venting state. After both the first and second flow valves are closed, the control center automatically switches the protective gas valve to the operating state, introducing protective gas at a pressure of approximately 0.01 MPa.

[0140] When the second valve opens, the control center automatically switches the protective gas valve connected to the temporary storage tank to the venting state. After the second valve closes, the control center automatically switches the protective gas valve to the operating state, introducing protective gas at a pressure of approximately 0.01 MPa. The automatic switching of the gas protective valve (i.e., switching between introducing protective gas and depressurizing) is to maintain a relative pressure balance inside and outside the tanks, thereby allowing liquid resin A1 to smoothly and unimpededly enter and exit the metering tank A1 and the temporary storage tank A1.

[0141] When the control center sends a signal to add liquid resin A1, the third valve automatically opens, injecting liquid resin A1 into the mixing equipment. After the third valve opens, the control center automatically opens the purging valve, introducing 0.5MPa gas to purge the liquid resin A1 in the discharge pipe at the bottom of the temporary storage tank. The gas purging time can be set, and the purging gas used is the same as the protective gas.

[0142] Figure 11 This is a schematic diagram of a production process according to one embodiment of this application. The liquid metering and dispensing system of this application works in conjunction with mixing equipment (sand mixer), etc., to produce various types of oil sands or proppant. Figure 11 As shown, the production process flow includes the following steps in sequence: Process node 1110: Sand feeding; Process node 1120: Injecting liquid A1 resin, mixing for X seconds, and then injecting liquid B resin; Process node 1130: Adding cooling water; Process node 1140: Introducing cooling air; Process node 1150: Injecting liquid A2 resin, mixing for X seconds, and then injecting liquid B resin; Process node 1160: Adding solid calcium powder; Process node 1170: Adding cooling water; Process node 1180: Introducing cooling air; Process node 1190: Sand discharge.

[0143] According to one embodiment of this application, multiple process nodes among process nodes 1120-1180 are selectable. This application designs process nodes as selectable, encompassing all production processes within a single equipment set. After a single new equipment production line is built or an upgrade is performed, all production processes can be met, achieving zero-cost process upgrades and product updates. Furthermore, there is an interval of N seconds between process nodes 1110 and 1120; between adjacent process nodes 1120-1180, the mixing equipment is controlled to mix for X seconds before proceeding to the next process node; and there is an interval of T seconds between process nodes 1180 and 1190. Where N is 0-15s, X is 0-120s, and T is 0-30s.

[0144] The following specific embodiments illustrate the flexible process flow of the liquid metering and dispensing system in this application.

[0145] Figure 12 This is a schematic flow diagram of a first manufacturing process according to an embodiment of this application. Figure 12 As shown, the first process requires the use of all nodes. Before starting work, select all nodes to operate according to the set process, and set parameters such as the weight of various raw materials and start-up time. Taking 3Kg of liquid A1 resin, 4Kg of primary liquid B resin, 3.5Kg of liquid A2 resin, and 5Kg of secondary liquid B resin as an example, the parameter settings are as follows:

[0146] A1 resin parameters:

[0147] Single-use material weight setting: 3Kg

[0148] First advance lead: 2.5 kg

[0149] First advance advance (second advance advance): 0.02 kg

[0150] All quadratic correlation parameters are set to 0.00.

[0151] Feeding and unloading time: 5S

[0152] Empty weighing weight threshold: 0.01 kg

[0153] Nominal delay time (second time threshold): 5S

[0154] Temporary storage tank discharge time: 5 seconds

[0155] A2 resin parameters:

[0156] Single material weight setting: 3.5Kg

[0157] First advance lead: 3 kg

[0158] First advance advance (second advance advance): 0.02 kg

[0159] All quadratic correlation parameters are set to 0.00.

[0160] Feeding and unloading time: 5S

[0161] Empty weight threshold: 0.01 kg

[0162] Nominal delay time (second time threshold): 5S

[0163] Temporary storage tank discharge time: 5 seconds

[0164] Resin B parameters:

[0165] Single-use material weight setting: 4Kg

[0166] First advance lead: 3.5 kg

[0167] First advance advance (second advance advance): 0.02 kg

[0168] Secondary material weight setting: 5Kg

[0169] Second fast-forward lead (first lead): 4.5 kg

[0170] Secondary advance lead: 0.02 kg

[0171] Feeding and unloading time: 8 seconds

[0172] Empty weighing weight threshold: 0.01 kg

[0173] Nominal delay time (second time threshold): 5S

[0174] Temporary storage tank discharge time: 5 seconds

[0175] Nitrogen filling delay t1 (third time threshold): 3S

[0176] Nitrogen purging delay t2 (fourth time threshold): 10S. First, start process node 1110: Enter the preset weight of sand into the heating equipment and heat it. When the sand reaches the set temperature, it enters the mixing equipment. After 35 seconds of reaching the set temperature, start process node 1120: Inject liquid A1 resin into the mixing equipment and mix. After mixing for 145 seconds, inject liquid B resin. After mixing for 145 seconds, start process node 1130: Add cooling water. After mixing for 120 seconds, start process node 1140: Introduce cooling air. After mixing for 105 seconds, start process node 1150: Inject liquid A2 resin. After mixing for 145 seconds, inject liquid B resin. After mixing for 145 seconds, start process node 1160: Add solid calcium powder. After mixing for 70 seconds, start process node 1170: Add cooling water. After mixing for 65 seconds, start process node 1180: Introduce cooling air. After mixing for 45 seconds, start process node 1190: Discharge sand. Then proceed to the next cycle.

[0177] Figure 13 This is a schematic flow chart of a second manufacturing process according to an embodiment of this application. Figure 13 As shown, before starting work, select process nodes 1110-1120 and 1150-1190 for the second process requirements. Nodes not selected are automatically skipped. Set the required weights of various raw materials and start-up times, etc. These settings are the same as those for the first production process and will not be repeated here. First, start process node 1110: A preset weight of sand is introduced into the heating equipment and heated. Once the sand reaches the set temperature, it enters the mixing equipment. After 15 seconds of reaching the set temperature, start process node 1120: Liquid A1 resin is injected into the mixing equipment and mixed. After 95 seconds of mixing, liquid B resin is injected. After 135 seconds of mixing, start process node 1150: Liquid A2 resin is injected. After 65 seconds of mixing, liquid B resin is injected. After 120 seconds of mixing, start process node 1160: Solid calcium powder is added. After 45 seconds of mixing, start process node 1170: Cooling water is added. After 75 seconds of mixing, start process node 1180: Cooling air is introduced. After 55 seconds of mixing, start process node 1190: Sand is discharged. Then proceed to the next loop.

[0178] Figure 14 This is a schematic flow chart of a third manufacturing process according to an embodiment of this application. Figure 14 As shown, before starting work, select process nodes 1110-1120, 1150, and 1190 as required by the third process. Nodes not selected are automatically skipped. Set the required weights of various raw materials and start-up times, etc. These parameter settings are the same as for the first production process and will not be repeated here. First, start process node 1110: A preset weight of sand is introduced into the heating equipment and heated. Once the sand reaches the set temperature, it enters the mixing equipment. Twenty seconds after reaching the set temperature, start process node 1120: Liquid A1 resin is injected into the mixing equipment and mixed. After mixing for 115 seconds, liquid B resin is injected. After mixing for 130 seconds, start process node 1150: Liquid A2 resin is injected. After mixing for 115 seconds, liquid B resin is injected. After mixing for 130 seconds, start process node 1190: Sand is discharged. Then, the next cycle begins.

[0179] Figure 15 This is a schematic flow diagram of a fourth manufacturing process according to an embodiment of this application. Figure 15 As shown, only liquid A2 resin and liquid B resin need to be added. Before starting work, select process nodes 1110, 1150-1160, and 1190 according to the fourth process requirement. If no node is selected, it will be automatically skipped. Set the weight of various raw materials and start-up time, etc. For example, with 4.5 kg of liquid A2 resin and 5 kg of liquid B resin, the parameters are set as follows:

[0180] Liquid A2 resin setting parameters:

[0181] All relevant parameters were set to 0.00.

[0182] Secondary material weight setting: 4.5Kg

[0183] Second advance lead (first advance lead): 4 kg

[0184] Secondary advance lead: 0.02 kg

[0185] Feeding and unloading time: 8 seconds

[0186] Empty weighing weight threshold: 0.01 kg

[0187] Nominal delay time (second time threshold): 5S

[0188] Temporary storage tank discharge time: 5 seconds

[0189] Liquid B resin parameters:

[0190] All relevant parameters were set to 0.00.

[0191] Secondary material weight setting (target filling amount): 5Kg

[0192] Second fast-forward lead (first lead): 4.5 kg

[0193] Secondary advance lead: 0.02 kg

[0194] Feeding and unloading time: 8 seconds

[0195] Empty weight threshold: 0.01 kg

[0196] Nominal delay time (second time threshold): 5S

[0197] Temporary storage tank discharge time: 5 seconds

[0198] Nitrogen filling delay t1 (third time threshold): 3S

[0199] Nitrogen filling delay t2 (fourth time threshold): 10s

[0200] First, process node 1110 is initiated: a preset weight of sand is introduced into the heating equipment and heated. Once the sand reaches the set temperature, it enters the mixing equipment. After 25 seconds of reaching the set temperature, process node 1150 is initiated: liquid A2 resin is injected, and after mixing for 15 seconds, liquid B resin is injected. After mixing for 30 seconds, process node 1160 is initiated: solid calcium powder is added. After mixing for 30 seconds, process node 1190 is initiated: sand is discharged. Then, the next cycle begins.

[0201] As can be seen from the above, the production system of this application adopts a flexible design. The system covers all production processes for products such as oil sand, oil sand and coated sand. It can adjust process nodes and working time according to process changes without the need to modify equipment. It has the advantages of simple operation, low difficulty and cost of process updates, and wide applicability.

[0202] In summary, this application discloses a liquid metering and dispensing system that cleverly utilizes the gravity-driven flow of liquid to transport it from a mixing tank to a temporary storage device, eliminating the need for pressurized pump delivery, thus reducing energy consumption and production costs. Furthermore, the system utilizes a control center to independently control the opening and closing of the first, second, and third valves to achieve automatic liquid metering and dispensing, automating the process, reducing manual intervention, and preventing harm to human health. Moreover, the liquid metering and dispensing system employs a sealed design, completely isolating the liquid from air and preventing chemical reactions between the liquid and air that could lead to clumping and pipe blockage.

[0203] The above embodiments are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art can make various changes and modifications without departing from the scope of this application. Therefore, all equivalent technical solutions should also fall within the scope of this application.

Claims

1. A liquid metering and dispensing system, comprising a system platform, characterized in that, Also includes: A mixing tank, located at the top of the system platform, is used to mix liquids. The mixing tank includes a first outlet at the bottom, a sealing cap, and a tank body sealed thereto. The liquid is a liquid resin. A metering device, located in the middle of the system platform, is used for weighing liquid. The metering device includes a second inlet and a second outlet located at the top and bottom, respectively. The second inlet is connected to the first outlet pipe via a first valve. Liquid is transported from the mixing tank to the metering device using gravity. The metering device also includes a flow control device and a metering tank connected to each other. The metering tank includes a sealing cap and a tank body sealed to it. The inlet of the flow control device is connected to the first outlet pipe via the first valve, and the second outlet is located at the bottom of the metering tank. The flow control device includes a first flow valve and a second flow valve. The first flow valve is connected to the first opening of the metering tank via a silicone hose and is on the same axis. The second flow valve is connected to the second opening via a silicone hose and is on the same axis. The metering device also includes a metering frame, on which the flow control device and the metering tank are mounted. The metering frame is fixed to the system platform by bolts and buffer springs. The buffer springs are sleeved on the bolts and located between the bolts and the base to buffer the impact force during liquid entry. A temporary storage device is installed at the bottom of the system platform for temporarily storing the weighed liquid. The temporary storage device includes a third liquid inlet and a third liquid outlet respectively installed at the top and bottom. The third liquid inlet is connected to the second liquid outlet pipe through a second valve, and the third liquid outlet is connected to the liquid container pipe through a third valve to add the liquid into an external liquid container. The temporary storage device includes a temporary storage tank and a sealing cap installed at the opening of the temporary storage tank. The control center is electrically connected to the first valve, the second valve, and the third valve, respectively. The control center controls the opening and closing of the first valve, the second valve, and the third valve to achieve automatic metering and filling of liquid. The mixing tank, metering device, and temporary storage device are each equipped with an air inlet. A protective gas with a predetermined pressure value is introduced through the air inlet to isolate the liquid from air. The predetermined pressure value is 0.01-0.04 MPa.

2. The liquid metering and dispensing system according to claim 1, characterized in that, Further includes: A blow valve is also provided between the third liquid outlet and the liquid container, through which protective gas is blown into the third liquid outlet to increase the liquid flow rate.

3. The liquid metering and dispensing system according to claim 1, characterized in that, One or more of the first valve, the second valve, and the third valve are pneumatic ball valves.

4. The liquid metering and dispensing system according to claim 3, characterized in that, The nominal diameter of the third valve is DN50-DN80.

5. The liquid metering and dispensing system according to claim 1, characterized in that, The tank wall includes an inner layer and an outer layer, which are spaced apart to form a hollow interlayer. The hollow interlayer is filled with a medium to regulate the temperature inside the tank.

6. The liquid metering and dispensing system according to claim 5, characterized in that, When the weather temperature is below the first temperature threshold, the medium filled into the hollow interlayer is low-temperature resistant heat-conducting oil. A heating layer is provided on the outer wall of the outer layer, and an insulation layer is provided on the outside of the heating layer. The heat of the heating layer is transferred to the inner layer by the low-temperature resistant heat-conducting oil. The first temperature threshold is between -5℃ and 5℃.

7. The liquid metering and dispensing system according to claim 5, characterized in that, When the ambient temperature is higher than the second temperature threshold, the medium filling the hollow interlayer is chilled water. The outer wall of the outer layer is provided with an insulation layer, a water inlet and a water outlet. An external refrigeration device is connected to the water inlet and the water outlet respectively to introduce chilled water into the hollow interlayer. The chilled water circulates in the insulation layer to reduce the temperature in the inner layer. The second temperature threshold is between 30℃ and 45℃.

8. The liquid metering and dispensing system according to claim 1, characterized in that, The first flow valve has a larger flow rate than the second flow valve; When the weight of the liquid in the metering tank reaches a first advance amount, the control center controls the first flow valve to close; when the weight of the liquid in the metering tank reaches a second advance amount, the control center controls the second flow valve to close.

9. The liquid metering and dispensing system according to claim 8, characterized in that, The first advance amount is less than the second advance amount, and both the first advance amount and the second advance amount are less than or equal to the target injection amount.

10. The liquid metering and dispensing system according to claim 1, characterized in that, in, The protective gases include nitrogen, argon, and helium.

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