Liquid metering device and mixing station

Abstract

This invention relates to the field of metering equipment technology, providing a liquid metering device and a mixing station. The liquid metering device includes: a metering hopper for containing liquid; a baffle that, together with the inner wall of the metering hopper, forms a metering space, the baffle being movably disposed within the metering hopper to change the volume of the metering space; the metering space is connected to a filling mechanism and a discharging mechanism, the discharging mechanism being used to discharge gas and / or liquid from the metering space; and a gap between the edge of the baffle and the inner wall of the metering hopper; and an air bladder disposed on the baffle and extending along its edge, the air bladder being able to deflate or inflate to open or close the gap between the baffle and the inner wall of the metering hopper. By adjusting the position of the baffle through a driving device, the volume of the metering space enclosed by the baffle and the metering hopper meets the requirements, achieving constant-volume liquid metering. Therefore, there is no need to control the liquid flow rate during filling, allowing for faster liquid filling and thus improving liquid metering efficiency.

Description

Technical Field

[0001] This invention relates to the field of metering equipment technology, and in particular to a liquid metering device and a mixing station. Background Technology

[0002] The primary purpose of a batching plant is to mix and blend concrete, commonly used in concrete engineering projects. Concrete production typically requires precise proportioning of various materials. In existing technologies, the weighing system of a concrete batching plant requires a combination of coarse and fine weighing. Specifically, during coarse weighing, a liquid pump adds liquid to the weighing hopper through a coarse outlet pipe, while during fine weighing, a storage tank and valves add liquid to the weighing hopper through a fine outlet pipe for precise compensation. However, switching between different pipelines is necessary, and the slower flow rate in the fine weighing pipe during switching can affect the weighing speed, resulting in low liquid metering efficiency. Summary of the Invention

[0003] This invention provides a liquid metering device and a mixing station to solve or improve the shortcomings of the prior art where the flow rate of the precision weighing tube is slow, resulting in low liquid metering efficiency, thereby achieving the effect of improving liquid metering efficiency.

[0004] This invention provides a liquid metering device, comprising:

[0005] A measuring hopper, used to hold liquids;

[0006] A baffle, which together with the inner wall of the metering hopper forms a metering space, is movably disposed within the metering hopper to change the volume of the metering space, and is connected to a filling mechanism and a discharging mechanism, the discharging mechanism being used to discharge gas and / or liquid from the metering space, and a gap between the edge of the baffle and the inner wall of the metering hopper.

[0007] An airbag is disposed on the baffle and extends along the edge of the baffle. The airbag is capable of deflating or inflating to open or close the gap between the baffle and the inner wall of the measuring hopper.

[0008] According to a liquid metering device provided by the present invention, the discharge mechanism includes a connecting structure, the baffle is horizontally arranged and located on the upper side of the metering space, one end of the connecting structure is located on the side of the baffle close to the metering space, and the other end of the connecting structure is located on the outside of the metering space.

[0009] According to a liquid metering device provided by the present invention, the connecting structure includes an overflow branch, one end of which is connected to the side of the baffle near the metering space, and the other end of which passes through the inner wall of the metering hopper.

[0010] And / or, the connection structure includes a ventilation branch, one end of which is connected to the metering space via the baffle.

[0011] According to a liquid metering device provided by the present invention, the discharge mechanism includes a discharge branch, one end of which penetrates the inner wall of the metering hopper (1) and communicates with the metering space at the bottom end of the metering space.

[0012] According to a liquid metering device provided by the present invention, the filling mechanism includes a liquid filling branch, one end of which is connected to the metering space via the baffle (3);

[0013] And / or, the liquid metering device further includes a filling / discharging branch connected to the airbag, the filling / discharging branch being used to inflate or deflate the airbag.

[0014] According to a liquid metering device provided by the present invention, a detection device and a control module are further included. The detection device is used to detect the water level information of the metering space. The detection device, the filling mechanism and the discharging mechanism are all connected to the control module. The control module controls the state of the filling mechanism and the state of the discharging mechanism based on the water level information.

[0015] According to a liquid metering device provided by the present invention, the detection device includes a pressure detection device disposed on the baffle, the pressure detection device being used to detect the pressure on the baffle;

[0016] And / or, the detection device includes a level gauge disposed on the side of the baffle near the metering space;

[0017] And / or, the detection device includes a flow meter, which is disposed on the overflow branch.

[0018] According to a liquid metering device provided by the present invention, the edge of the baffle is provided with a mounting groove, the mounting groove extends along the edge of the baffle, and the airbag is installed in the mounting groove.

[0019] The present invention also provides a mixing plant, including the liquid metering device described above.

[0020] The liquid metering device provided by this invention can hold liquid in a metering hopper and discharge liquid from the metering hopper through a discharge mechanism. By installing a baffle inside the metering hopper, the side of the baffle near the discharge valve and the inner wall of the metering hopper can form a metering space, thereby achieving constant-volume metering. The size of the metering space can be adjusted by changing the position of the baffle, thus enabling the metering of different volumes of liquid as needed. By installing an air bladder along the edge of the baffle, the gap between the baffle and the inner wall of the metering hopper can be sealed, preventing liquid from flowing through the gap and ensuring accurate measurement of the liquid within the metering space.

[0021] With this configuration, the liquid metering device provided by this invention adjusts the position of the baffle to ensure that the volume of the metering space enclosed by the baffle and the metering hopper meets the requirements. Liquid is then added into the metering space to achieve constant-volume metering. Since the volume of the liquid is determined by the volume of the metering space, there is no need to control the liquid flow rate during addition, allowing for faster addition and thus improving metering efficiency. Furthermore, once the baffle is properly positioned, if the measured value is the same each time, metering can be repeated directly without further baffle adjustment, thereby improving repeatability.

[0022] The mixing plant provided by the present invention incorporates the liquid metering device provided by the present invention, and therefore includes all the advantages of the liquid metering device described above. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a liquid metering device provided in some embodiments of the present invention;

[0025] Figure 2 These are provided in some embodiments of the present invention. Figure 1 A magnified view of section I in the image.

[0026] Figure label:

[0027] 1. Measuring hopper; 2. Drain valve; 3. Baffle; 301. Mounting slot; 4. Drive unit; 5. Airbag; 6. Liquid filling branch; 601. Water pump; 7. Overflow branch; 701. Switch valve; 8. First exhaust valve; 9. Filling and discharging pipe; 10. Second exhaust valve; 11. Air inlet valve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] The following is combined with Figures 1 to 2 The embodiments of the present invention provide a liquid metering device.

[0030] Specifically, the liquid metering device includes a metering hopper 1, a baffle 3, and an air bladder 5.

[0031] Among them, the measuring hopper 1 is used to hold liquid.

[0032] The baffle 3 and the inner wall of the measuring hopper 1 form a measuring space. The baffle 3 is movably disposed within the measuring hopper 1 to change the volume of the measuring space. For example, the measuring hopper 1 is vertically positioned during use, and the baffle 3 is vertically movable within it. The measuring space is equipped with a filling mechanism for adding liquid into the measuring space. For example, the measuring space has a filling port, and the filling mechanism can be connected to the filling port to add liquid through it. The measuring space is also connected to a discharge mechanism for discharging gas and / or liquid from the measuring space. There is a gap between the edge of the baffle 3 and the inner wall of the measuring hopper 1; specifically, there is a gap between the outer peripheral sidewall of the baffle 3 and the inner peripheral sidewall of the measuring hopper 1.

[0033] An airbag 5 is disposed on the baffle 3 and extends along the edge of the baffle 3. For example, if the baffle 3 is circular, the airbag 5 is annular, and the airbag 5 is fitted onto the outer circumferential wall of the baffle 3. The airbag 5 can be inflated or deflated to open or close the gap between the baffle 3 and the inner wall of the measuring hopper 1. Specifically, when the airbag 5 is inflated, it abuts against the inner wall of the measuring hopper 1, thereby sealing the gap between the baffle 3 and the measuring hopper 1. When the airbag 5 is deflated, it disengages from the inner wall of the measuring hopper 1, thereby opening the gap between the baffle 3 and the measuring hopper 1.

[0034] In this embodiment, the metering process of the liquid metering device includes: releasing gas from the air bladder 5 to open the gap between the baffle 3 and the metering hopper 1. Liquid is then added to the metering space via the filling mechanism until the liquid contacts or exceeds the baffle. The air bladder 5 is then inflated to close the gap between the baffle 3 and the metering hopper 1. Thus, even if the liquid level in the metering hopper 1 exceeds the baffle 3, the liquid at the top of the baffle 3 cannot enter the metering space due to the separation effect of the air bladder 5. Therefore, the measured value of the liquid remains the volume of the metering space, ensuring the accuracy of the liquid measurement. Then, in some embodiments, the discharge mechanism is activated, and the baffle 3 is driven to move, reducing the volume of the metering space. During the reduction of the metering space volume, the liquid in the metering space is discharged through the discharge mechanism, thereby completing the metering process. In this way, the liquid is discharged under the pressure of the baffle 3, which improves the discharge efficiency of the liquid in the metering hopper 1, saves the discharge time of the metering hopper 1, and reduces the waiting time for the next metering.

[0035] In summary, the liquid metering device provided in this embodiment of the invention adjusts the position of the baffle 3 to ensure that the volume of the metering space enclosed by the baffle 3 and the metering hopper 1 meets the requirements. Liquid is then added into the metering space to achieve constant-volume metering. Since the volume of the liquid is determined by the volume of the metering space, there is no need to control the liquid flow rate during addition, allowing for faster addition and thus improving metering efficiency. Furthermore, once the position of the baffle 3 is adjusted, if the metered value of the liquid is the same each time, metering can be repeated directly without further adjustment of the baffle 3, thereby improving repeatability efficiency.

[0036] In some embodiments provided by the present invention, the discharge mechanism includes a drain branch, one end of which penetrates the inner wall of the metering hopper 1 and communicates with the bottom of the metering space. For example, when discharging liquid from the metering space, the drain branch can be opened to allow the liquid in the metering space to be discharged through the drain branch. Optionally, the drain branch includes a drain valve 2. For example, see reference... Figure 1 As shown in the figure, the measuring hopper 1 is a cylindrical structure, and during use, the measuring hopper 1 is set vertically. The bottom end of the measuring hopper 1 is set as a convex spherical structure, and the drain valve 2 is set at the lowest point of the spherical structure to facilitate the complete discharge of liquid from the measuring hopper 1. The side of the baffle 3 near the drain valve 2 and the inner wall of the measuring hopper 1 form a measuring space.

[0037] In some embodiments of the present invention, the discharge mechanism includes a connecting structure. One end of the connecting structure is disposed on the side of the baffle 3 near the metering space, and the other end of the connecting structure is disposed on the outside of the metering hopper 1. The connecting structure can connect or disconnect the metering space from the outside. In this way, the metering space can exchange airflow with the outside when liquid is added to or discharged from the metering space.

[0038] In this embodiment, the liquid metering device can inflate the airbag 5 before or after adding the liquid during the metering process. These will be described separately below.

[0039] The metering process of inflating the airbag 5 before adding liquid includes: adjusting the position of the baffle 3 before inflating the airbag 5 so that the volume of the metering space equals the liquid's metering value; then inflating the airbag 5 to seal the gap between the baffle 3 and the metering hopper 1; and then adding liquid into the metering space. During the filling process, air in the metering space can be discharged through the connecting structure to facilitate smooth liquid addition. Adding is stopped when the liquid contacts the baffle 3, and excess liquid generated during addition can be discharged through the connecting structure. At this point, the liquid's metering value equals the volume of the metering space, ensuring the accuracy of the liquid metering value.

[0040] The metering process of inflating the airbag 5 after adding liquid includes: first, adjusting the position of the baffle 3 so that the volume of the metering space equals the liquid's metering value; adding liquid into the metering space, during which air in the metering space can be discharged through the connecting structure or the gap between the baffle 3 and the metering hopper 1 to facilitate smooth liquid addition; stopping the addition once the liquid contacts the baffle 3; then inflating the airbag 5 to seal the gap between the baffle 3 and the metering hopper 1. Thus, even if the liquid level in the metering hopper 1 exceeds the baffle 3, the liquid at the top of the baffle 3 cannot enter the metering space due to the separation effect of the airbag 5. Therefore, the liquid's metering value remains the volume of the metering space, ensuring the accuracy of the liquid metering value.

[0041] Furthermore, when discharging liquid from the metering device, both the connecting structure and the drainage branch can be opened simultaneously. Outside air enters the metering hopper 1 through the connecting structure, allowing the liquid inside the metering hopper 1 to drain through the drainage branch. Of course, the liquid in the metering hopper 1 is not limited to being discharged by gravity. For example, when discharging liquid from the metering hopper 1, the connecting structure can be closed, the drainage branch opened, and the baffle 3 driven downwards. Under the pressure of the baffle 3, the liquid is discharged from the discharge mechanism. This improves the discharge efficiency of the liquid in the metering hopper 1, saves discharge time, and reduces the waiting time for the next metering. In cases where no drainage branch is provided, the liquid can also be discharged from the connecting structure under the pressure of the baffle 3.

[0042] refer to Figure 1 As shown, in some embodiments of the present invention, the connecting structure includes an overflow branch 7. One end of the overflow branch 7 is connected to the side of the baffle 3 near the metering space, and the other end of the overflow branch 7 passes through the inner wall of the metering hopper 1. Preferably, the height of the connection point between the overflow branch 7 and the baffle 3 is greater than the height of the overflow branch 7's exit point from the metering hopper 1.

[0043] refer to Figure 1 As shown, with this configuration, the overflow branch 7 can discharge air from the metering space when the liquid level in the metering hopper 1 is not in contact with the baffle 3, so that the liquid can smoothly enter the metering space; it can also discharge liquid from the metering space when the liquid level in the metering hopper 1 is in contact with the baffle 3, so as to prevent the liquid level from continuing to rise and exceeding the baffle 3, thus ensuring the accuracy of the liquid volume in the metering space; and it can also allow outside air to enter the metering space when discharging liquid, ensuring that the liquid is smoothly discharged.

[0044] Optionally, the overflow branch 7 is equipped with a switch valve 701, which can control the opening and closing of the overflow branch 7. For example, the switch valve 701 can be opened when overflow is required or when the metering space is connected to the atmosphere. The switch valve 701 can be closed when the liquid in the metering space needs to be discharged using the baffle 3. The switch valve 701 can be an electric valve or a pneumatic valve.

[0045] Optionally, the end of the overflow branch 7 that extends into the metering space can be connected to the side of the baffle 3 near the metering space by a snap ring, pipe clamp, or clamp.

[0046] Optionally, the number of overflow branches 7 can be set to at least two to facilitate the timely discharge of excess liquid and ensure the accuracy of the measured liquid volume.

[0047] In some embodiments provided by the present invention, the connecting structure includes a ventilation branch, one end of which is connected to the metering space via a baffle 3. For example, the ventilation branch is disposed on the baffle 3, and one end of the ventilation branch is disposed on the side of the baffle 3 away from the metering space, while the other end of the ventilation branch passes through the baffle 3 and is connected to the metering space.

[0048] The venting branch and the overflow branch can be selected for installation, or the venting branch can be installed simultaneously with the overflow branch 7. When both the venting branch and the overflow branch 7 are installed simultaneously, the overflow branch 7 is only responsible for overflow, while the venting branch is responsible for airflow exchange between the metering space and the atmosphere. Each performs its own function without affecting the other, which improves the stability of the liquid metering device. Specifically, during the process of adding liquid to the metering space, the overflow branch 7 is open and the venting branch is closed. When discharging liquid from the metering space using gravity, the overflow branch 7 is closed and the venting branch is open. When discharging liquid from the metering space using a baffle, the overflow branch 7 is closed and the venting branch is closed.

[0049] Optionally, the ventilation branch is provided with a first exhaust valve 8, which controls the opening and closing of the ventilation branch.

[0050] In some embodiments of the present invention, the filling mechanism includes a liquid filling branch 6. One end of the liquid filling branch 6 is connected to the metering space via a baffle 3. For example, a filling port is provided on the baffle 3, and the liquid filling branch 6 is connected to the filling port. The liquid filling branch 6 is used to add liquid into the metering hopper 1. The liquid filling branch 6 is used to connect to a container storing liquid and can guide the liquid in the container into the metering space. With this configuration, the liquid outlet of the filling mechanism moves with the baffle 3 and is not affected by the stop position of the baffle 3. That is, the liquid filling branch 6 will not affect the addition of liquid into the metering space no matter where the baffle 3 stops.

[0051] Optionally, the liquid addition branch 6 includes a water pump 601 and a pipeline. The water pump 601 is connected to the metering space through the pipeline. When the water pump 601 is turned on, the water pump 601 can add liquid into the metering space. When the water pump 601 is turned off, the water pump 601 stops adding liquid into the metering space.

[0052] In some embodiments of the present invention, the liquid metering device further includes a filling / discharging branch connected to the airbag 5, which is used to inflate or deflate the airbag 5. The filling / discharging branch is connected to a gas source, thereby enabling the introduction of gas from the gas source into the airbag 5 to inflate it. The filling / discharging branch is also connected to the atmosphere, thereby enabling the airbag 5 to communicate with the atmosphere and deflate it.

[0053] Specifically, the inflation / deflation branch includes an inflation / deflation pipe 9, an inlet valve 11, and a second exhaust valve 10. The inflation / deflation pipe 9 is connected to the airbag 5. One end of the inlet valve 11 is connected to the inflation / deflation pipe 9, and the other end is connected to an air source. One end of the second exhaust valve 10 is connected to the inflation / deflation pipe 9, and the other end is connected to the atmosphere. When inflating the airbag 5, the inlet valve 11 opens, the second exhaust valve 10 closes, and gas from the air source enters the airbag 5 through the inlet valve 11. When deflating the airbag 5, the inlet valve 11 closes, the second exhaust valve 10 opens, and gas from the airbag 5 is discharged through the second exhaust valve 10.

[0054] In some embodiments of the present invention, the liquid metering device further includes a drive device 4. The drive device 4 is connected to the baffle 3 and is used to drive the baffle 3 to move. For example, optionally, the drive device 4 is mounted on top of the metering hopper 1, thus making the structure of the liquid metering device more compact. By driving the baffle 3 to move using the drive device 4, manual labor can be reduced.

[0055] In some embodiments provided by the present invention, the driving device 4 includes a hydraulic cylinder, a pneumatic cylinder, or a stepper motor. When the driving device 4 is a hydraulic cylinder or a pneumatic cylinder, the cylinder body of the driving device 4 is connected to the measuring hopper 1, and the piston rod of the driving device 4 is connected to the baffle 3. The baffle 3 is displaced by the extension and retraction of the driving device 4. When the driving device 4 is a stepper motor, the stepper motor is connected to the baffle 3 through a lead screw and nut mechanism. Specifically, the lead screw of the lead screw and nut is fixedly connected to the baffle 3, the nut of the lead screw and nut mechanism is rotatably mounted on the measuring hopper 1, the stepper motor is mounted on the measuring hopper 1, and the output shaft of the stepper motor is connected to the nut and used to drive the nut to rotate.

[0056] Optionally, the number of drive devices 4 can be set to at least two, which can reduce the load on each drive device 4 and make the force on the baffle 3 easier to balance. Furthermore, when there are multiple drive devices 4, the types of drive devices 4 can be different, for example, a mixture of hydraulic cylinder type drive devices and stepper motor type drive devices. Thus, when adjusting the position of the baffle 3, the stepper motor type drive device 4 can drive the baffle 3 to move, ensuring the accuracy of the baffle 3. When using the baffle 3 to drive the liquid out of the metering space, the hydraulic cylinder can drive the baffle 3, or the hydraulic cylinder and stepper motor can drive the baffle 3 simultaneously, thereby providing a greater driving force to the baffle 3 and reducing the load on the stepper motor.

[0057] Optionally, to reduce the bending moment experienced by the drive unit 4, a guide rod is provided at the top of the baffle 3, and a guide sleeve can be provided at the top of the metering hopper 1 for the guide rod to pass through and slide. Through the sliding cooperation between the guide sleeve and the guide rod, the overturning moment of the baffle 3 can be borne, thereby reducing the bending moment experienced by the drive unit 4 and ensuring the smooth operation of the baffle 3. Furthermore, the number of guide rods can be set to at least two.

[0058] In some embodiments of the present invention, the liquid metering device further includes a detection device and a control module. The detection device is used to detect the water level information of the metering space. The detection device, the filling mechanism, and the discharging mechanism are all connected to the control module, which controls the state of the filling mechanism and the discharging mechanism based on the water level information. The state of the filling mechanism is the same as the state of the liquid filling branch 6, including an open state and a stopped state. In the open state, the filling mechanism adds liquid; in the stopped state, the filling mechanism stops adding liquid. The discharging mechanism includes an open state and a closed state. In the open state, the discharging mechanism is open; in the closed state, the discharging mechanism is closed.

[0059] Specifically, during the process of adding liquid into the metering space, when the liquid reaches the position of baffle 3, the detection device transmits the water level information to the control module. Based on the water level information, the control module controls the liquid adding branch 6 to switch to the stop state, for example, it can control the water pump 601 to turn off. Then, it controls the discharge mechanism to switch to the open state to discharge the liquid in the metering space.

[0060] This setup can improve the automation level of liquid metering devices, reduce manual intervention, and improve metering accuracy.

[0061] Furthermore, both the drive device 4 and the connecting structure are connected to the control module. In situations requiring rapid liquid discharge, after receiving the water level information transmitted by the detection device, the control module controls the liquid filling branch 6 to close, and controls the discharge mechanism to open. Then, it controls the connecting structure to close, and finally controls the drive device 4 to drive the baffle 3 to move closer to the discharge valve 2, thereby increasing the discharge speed of the liquid in the metering space. Furthermore, the filling and discharging branch is connected to the control module. Before the control module controls the drive device 4 to drive the baffle 3 downward to discharge the liquid, the control module controls the filling and discharging branch to deflate the airbag 5 for a preset time to reduce friction between the airbag 5 and the metering hopper 1. The preset time can be determined experimentally.

[0062] In some embodiments of the present invention, the detection device includes a pressure detection device connected to the baffle 3. The pressure detection device is used to detect the pressure on the baffle 3. When the liquid in the metering space comes into contact with the baffle 3, the baffle 3 is subjected to the pressure of the liquid. Therefore, when the pressure detection device detects that the baffle 3 is under pressure, it indicates that the liquid has reached the position of the baffle 3 and is in contact with the baffle 3.

[0063] Optionally, the pressure detection device can be a strain gauge, which is disposed on the surface of the baffle 3 away from the drain valve 2, or the strain gauge is disposed on the lead screw of the lead screw and nut mechanism. Of course, the pressure detection device can also be a pressure sensor, for example, the pressure sensor can be disposed between the baffle 3 and the oil cylinder, between the baffle 3 and the air cylinder, or between the baffle 3 and the screw.

[0064] In some embodiments provided by the present invention, the detection device includes a level gauge, which is disposed on the side of the baffle 3 near the metering space. The level gauge can detect the liquid level signal. Therefore, when the liquid in the metering space reaches the position of the level gauge, it indicates that the liquid has reached the position of the baffle 3 and is in contact with the baffle 3.

[0065] In some embodiments of the present invention, the detection device includes a flow meter. The flow meter is mounted on the overflow branch 7 and is used to detect the flow rate within the overflow branch 7. One end of the overflow branch 7 is connected to the side of the baffle 3 near the metering space, and the other end of the overflow branch 7 extends through the inner wall of the metering hopper 1. When the liquid in the metering space reaches the position of the baffle 3 and comes into contact with it, the liquid is discharged through the overflow branch 7, thereby triggering the flow meter. Therefore, the flow meter can determine the liquid level information in the metering space based on the flow rate of the overflow branch 7.

[0066] Optionally, the detection device may include at least two of a pressure detection device, a level gauge, and a flow meter. Since the placement and detection principles of the various detection elements differ, by setting at least two different types of detection elements, the control module can promptly shut off the liquid supply branch 6 based on the information fed back by the detection element that first provides the liquid level information.

[0067] refer to Figure 1 and Figure 2 As shown, in some embodiments provided by the present invention, the edge of the baffle 3 is provided with a mounting groove 301, which extends along the edge of the baffle 3, and the airbag 5 is installed in the mounting groove 301. With this configuration, the structure of the mounting groove 301 is simple, and the airbag 5 is convenient to install and remove by placing it in the mounting groove 301.

[0068] The liquid metering device described above can perform metering based on liquid metering methods.

[0069] Specifically, the liquid metering method includes steps S100 to S300.

[0070] Step S100: Adjust the position of baffle 3.

[0071] Specifically, since the total volume of the measuring hopper 1 is fixed, the volume of the measuring space divided by the baffle 3 within the measuring hopper 1 can be adjusted by adjusting the position of the baffle 3. The position of the baffle 3 is adjusted so that the volume of the measuring space equals the required measurement value for the liquid. Specifically, the position of the baffle 3 can be adjusted using a drive device.

[0072] Step S200: Add liquid into the metering space until the liquid contacts the baffle 3.

[0073] Specifically, liquid can be added to the metering hopper 1 through the liquid filling branch 6. For example, the two ends of the liquid filling branch 6 are connected to the metering space and the container storing the liquid, respectively, and can guide the liquid in the container into the metering space. The contact between the liquid and the baffle 3 can be determined based on whether liquid is discharged from the overflow branch 7. When liquid is discharged from the overflow branch 7, the liquid filling branch 6 can be manually closed. Alternatively, the water level information in the metering hopper 1 can be detected by a detection device and transmitted to the control module. Both the liquid filling branch 6 and the drain valve 2 are connected to the control module. The control module controls the liquid filling branch 6 to close after determining that the liquid has contacted the baffle 3 based on the water level information.

[0074] Step S300: Inflate the airbag 5.

[0075] Specifically, the airbag 5 can be inflated through the inflation / deflation branch.

[0076] It should be noted that steps S200 and S300 can be interchanged. That is, the airbag 5 can be inflated before the liquid is added or after the liquid is added. This has been explained above and will not be repeated here.

[0077] The liquid metering method provided in this embodiment of the invention adjusts the position of the baffle 3 to ensure that the volume of the metering space enclosed by the baffle 3 and the metering hopper 1 meets the requirements. Liquid is then added into the metering space to achieve constant-volume metering. Since the volume of the liquid is determined by the volume of the metering space, there is no need to control the liquid flow rate during addition, allowing for faster addition and thus improving metering efficiency. Furthermore, once the position of the baffle 3 is adjusted, if the metered value of the liquid is the same each time, metering can be repeated directly without further adjustment of the baffle 3, thereby improving repeatability efficiency.

[0078] Furthermore, in some embodiments provided by the present invention, after the liquid comes into contact with the baffle 3, the method further includes: opening the drain branch to discharge the liquid in the metering hopper 1.

[0079] Specifically, when discharging liquid from the metering device, the connecting structure and the drain branch can be opened simultaneously, allowing outside air to enter the metering hopper 1 through the connecting structure, so that the liquid in the metering hopper 1 can be discharged through the drain valve 2. Alternatively, when discharging liquid from the metering hopper 1, the connecting structure can be closed, and then the baffle 3 can be driven downward by the drive device 4, thereby discharging the liquid under the pressure of the baffle 3. This can improve the discharge efficiency of the liquid in the metering hopper 1, save the discharge time of the metering hopper 1, and reduce the waiting time for the next metering.

[0080] This invention also provides a mixing plant.

[0081] Specifically, the mixing plant includes the liquid metering device described above.

[0082] It should be noted that the mixing plant includes a liquid metering device, which also has corresponding advantages, which will not be elaborated here.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid metering device, characterized in that, include: Measuring hopper (1), used to hold liquid; A baffle (3) is provided, which together with the inner wall of the metering hopper (1) forms a metering space. The baffle (3) is movably disposed within the metering hopper (1) to change the volume of the metering space. The metering space is connected to a filling mechanism and a discharging mechanism. The discharging mechanism is used to discharge gas and / or liquid from the metering space. There is a gap between the edge of the baffle (3) and the inner wall of the metering hopper (1). An airbag (5) is disposed on the baffle (3) and extends along the edge of the baffle (3). The airbag (5) can be deflated or inflated to open or close the gap between the baffle (3) and the inner wall of the measuring hopper (1). The emission mechanism includes a connecting structure, the baffle (3) is horizontally arranged and located on the upper side of the metering space, one end of the connecting structure is located on the side of the baffle (3) close to the metering space, and the other end of the connecting structure is located on the outside of the metering space; The connecting structure includes an overflow branch (7), one end of which is connected to the side of the baffle (3) near the metering space, and the other end of which passes through the inner wall of the metering hopper (1). And / or, the connection structure includes a ventilation branch, one end of which is connected to the metering space via the baffle (3).

2. The liquid metering device according to claim 1, characterized in that, The discharge mechanism includes a discharge branch, one end of which penetrates the inner wall of the metering hopper (1) and is connected to the metering space at the bottom.

3. The liquid metering device according to claim 1, characterized in that, The filling mechanism includes a liquid filling branch (6), one end of which is connected to the metering space via the baffle (3); And / or, the liquid metering device further includes a filling / discharging branch connected to the airbag (5), the filling / discharging branch being used to inflate or deflate the airbag (5).

4. The liquid metering device according to any one of claims 1-3, characterized in that, It also includes a detection device and a control module. The detection device is used to detect the water level information of the metering space. The detection device, the filling mechanism and the discharge mechanism are all connected to the control module. The control module controls the state of the filling mechanism and the state of the discharge mechanism based on the water level information.

5. The liquid metering device according to claim 4, characterized in that, The detection device includes a pressure detection device, which is connected to the baffle (3) and is used to detect the pressure on the baffle (3); And / or, the detection device includes a level gauge disposed on the side of the baffle (3) near the metering space; And / or, the detection device includes a flow meter, which is disposed on the overflow branch (7).

6. The liquid metering device according to any one of claims 1-3, characterized in that, The edge of the baffle (3) is provided with an installation groove (301), the installation groove (301) extends along the edge of the baffle (3), and the airbag (5) is installed in the installation groove (301).

7. The liquid metering device according to any one of claims 1-3, characterized in that, It also includes a drive device (4), which is connected to the baffle (3) and is used to drive the baffle (3) to move.

8. A mixing plant, characterized in that, Includes the liquid metering device as described in any one of claims 1-7.

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