Liquid measuring device

Abstract

The present invention discloses a liquid metering device, comprising a control component, a mounting base and a shell arranged on the mounting base, wherein a weight metering component and a flow metering component are arranged inside the shell; the control component comprises a PLC, a weighing module, a display screen and several motor control plugs, and the PLC is electrically connected to the weighing module, the display screen and several motor control plugs respectively; the weight metering component comprises at least one metering bin arranged inside the shell, the metering bin is provided with a liquid replenishment component and a liquid outlet component which are connected to the inside and one end of which extends to the outside of the shell respectively, the liquid replenishment component and the liquid outlet component are respectively provided with a liquid replenishment control valve and a liquid outlet control valve, and a weighing sensor is respectively arranged at the bottom of each metering bin. The present invention measures liquid by weight measurement to ensure the metering effect.

Description

Technical Field

[0001] The invention belongs to the field of liquid metering, and in particular relates to a liquid metering device. Background Art

[0002] Nowadays, liquid measurement is required in many fields to improve product quality, increase production efficiency and reduce production costs. The accuracy and reliability of measurement are the most important aspects of liquid measurement. At present, there are two conventional measurement methods:

[0003] 1. Measure with the help of measuring tools with visual measuring functions such as scale and weight display. This method is too inefficient and inaccurate.

[0004] 2. Measurement is carried out through some metering systems or metering devices; although this method can ensure efficiency, most of these metering systems or metering devices have some defects in their design, and the accuracy of measurement cannot be guaranteed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a liquid metering device to measure the liquid by weight to ensure the metering effect in view of the above-mentioned deficiencies in the prior art.

[0006] The technical solution adopted by the present invention is: a liquid metering device, comprising a control component, a mounting base and a shell arranged on the mounting base, wherein a weight metering component and a flow metering component are arranged inside the shell;

[0007] The control assembly includes a PLC, a weighing module, a display screen and several motor control plugs, and the PLC is electrically connected to the weighing module, the display screen and the several motor control plugs respectively;

[0008] The weight metering component includes at least one metering bin arranged inside the shell, the metering bin is provided with a liquid replenishing component and a liquid outlet component which are connected with the inside and one end of which extends to the outside of the shell respectively, the liquid replenishing component and the liquid outlet component are respectively provided with a liquid replenishing control valve and a liquid outlet control valve, each metering bin is respectively provided with a weighing sensor at the bottom, the weighing sensor is electrically connected to the weighing module, and the liquid replenishing control valve and the liquid outlet control valve are respectively electrically connected to the PLC;

[0009] The flow metering component includes a liquid adding inlet pipe and a liquid adding outlet pipe which are interconnected, a flow metering pipeline is formed between the liquid adding inlet pipe and the liquid adding outlet pipe, a liquid adding control valve and a liquid flow meter are sequentially arranged on the flow metering pipeline along the liquid running direction, and the liquid adding control valve and the liquid flow meter are respectively electrically connected to the PLC.

[0010] In one of the embodiments, when there is one metering bin, the fluid replenishment assembly includes a fluid replenishment branch pipe and a fluid replenishment main pipe connected to the fluid replenishment branch pipe and extending to the outside of the shell, and there is one fluid replenishment control valve and arranged on the fluid replenishment branch pipe or the fluid replenishment main pipe.

[0011] In one of the embodiments, when there is one metering bin, the liquid outlet assembly includes a liquid outlet branch pipe and a liquid outlet main pipe connected to the liquid outlet branch pipe and extending to the outside of the shell, and there is one liquid outlet control valve and arranged on the liquid outlet branch pipe or the liquid outlet main pipe.

[0012] In one of the embodiments, when there are at least two metering bins, the fluid replenishment assembly includes a fluid replenishment branch pipe whose number is the same as the number of the metering bins and a fluid replenishment main pipe extending to the outside of the shell, one end of each of the fluid replenishment branch pipes is connected to each metering bin respectively, and the other end of each of the fluid replenishment branch pipes is connected to the fluid replenishment main pipe, and the number of the fluid replenishment control valves is the same as the number of the metering bins and is respectively arranged on each of the fluid replenishment branch pipes.

[0013] In one of the embodiments, when there are at least two metering bins, the liquid outlet assembly includes liquid outlet branches whose number is the same as the number of metering bins and a liquid outlet main pipe extending to the outside of the shell, one end of each of the liquid outlet branches is connected to each metering bin respectively, and the other end of each of the liquid outlet branches is connected to the liquid outlet main pipe, and the number of the liquid outlet control valves is the same as the number of metering bins and is respectively arranged on each liquid outlet branch pipe.

[0014] In one of the embodiments, the metering bin includes a bin body and a movable cover plate detachably connected to the bin body, the movable cover plate is provided with a liquid inlet and a liquid outlet which are connected to the interior of the bin body and extend to the outside of the movable cover plate, the liquid inlet branch pipe and the liquid outlet branch pipe respectively pass through the liquid inlet and the liquid outlet and extend to a position inside the bin body near the bottom.

[0015] In one of the embodiments, a limiting annular protrusion with a diameter larger than that of the feed pipe and the liquid outlet pipe and extending upward is provided at a position on the movable cover plate corresponding to the liquid inlet and the liquid outlet, the liquid inlet branch pipe sequentially passes through the liquid inlet and the limiting annular protrusion and extends to a position near the bottom of the inner side of the warehouse body, the liquid outlet branch pipe sequentially passes through the liquid outlet and the limiting annular protrusion and extends to a position near the bottom of the inner side of the warehouse body, and when the liquid inlet branch pipe and the liquid outlet branch pipe pass through the limiting annular protrusion, a gap is formed between the liquid inlet branch pipe, the liquid outlet branch pipe and the limiting annular protrusion.

[0016] In one of the embodiments, a drain pipe communicating with the interior of each bin body is provided on the side surface of each bin body near the bottom, and a drain valve is provided on the drain pipe.

[0017] In one embodiment, the control component further includes an emergency stop button and a frequency converter, and the emergency stop button and the frequency converter are electrically connected to the PLC respectively.

[0018] In one of the embodiments, an exhaust component is further included, and the exhaust component includes an exhaust and liquid replenishment control valve, an exhaust main pipe and exhaust branch pipes whose number is the same as the number of liquid outlet branch pipes, the two ends of the exhaust and liquid replenishment control valve are respectively connected to the liquid replenishment main pipe and the liquid outlet main pipe, and the exhaust and liquid replenishment control valve is provided with an exhaust and liquid replenishment control valve, one end of each of the exhaust branch pipes is respectively connected to each liquid outlet branch pipe, and the other end of each of the exhaust branch pipes is connected to the exhaust main pipe, and at least one exhaust valve is provided on the exhaust main pipe.

[0019] The beneficial effects of the present invention are:

[0020] 1. Set up weight measuring components and control components to measure the liquid by weight to ensure the measuring effect;

[0021] 2. Setting up flow metering components increases the selectivity of liquid metering, making it easier to choose different metering methods according to different liquids;

[0022] 3. By adjusting the number of metering bins, the needs of different liquid metering can be met;

[0023] 4. A limiting annular protrusion is provided on the silo body, and the fixing of the infusion branch pipe and the outlet branch pipe is coordinated with the infusion port and the outlet port, so that a gap is formed between the infusion branch pipe and the outlet branch pipe and the limiting annular protrusion, and the infusion branch pipe and the outlet branch pipe do not contact the silo body, thereby fully ensuring the accuracy of the measurement result;

[0024] 5. The setting of the exhaust component can discharge the gas in the liquid outlet component before metering to prevent the gas from affecting the accuracy of metering. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the distribution of components in Example 1 of the present invention;

[0028] Figure 4 This is a front view of Embodiment 1 of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0030] Figure 6 This is a schematic diagram of the distribution of components in Example 2 of the present invention;

[0031] Figure 7 It is a right view of Embodiment 2 of the present invention;

[0032] Figure 8 This is a control block diagram of the present invention;

[0033] Fig. 9 This is a schematic diagram of the structure of the metering bin of the present invention;

[0034] Fig.10 This is a cross-sectional view of the metering bin of the present invention;

[0035] Fig.11 For the present invention Fig.10 Enlarged view of point A in the middle.

[0036] In the figure: 1. Control component; 2. Mounting base; 3. Shell; 4. Weight measuring component; 5. Flow measuring component; 6. Exhaust component; 11. PLC; 12. Weighing module; 13. Display screen; 14. Motor control plug; 15. Emergency stop button; 16. Frequency converter; 21. Action wheel; 31. Hand push handle; 41. Measuring bin; 42. Liquid filling component; 43. Liquid outlet component; 44. Liquid filling control valve; 45. Liquid outlet control valve; 46. Weighing sensor; 47. Sensor mounting plate; 411. Bin body; 412. Movable cover; 413 , liquid filling port; 414, liquid outlet; 415, limiting annular protrusion; 416, gap; 417, drain pipe; 418, drain valve; 419, buffer baffle; 4110, bottom valve; 421, liquid filling main pipe; 422, liquid filling branch pipe; 431, liquid outlet main pipe; 432, liquid outlet branch pipe; 51, liquid adding inlet pipe; 52, liquid adding outlet pipe; 53, liquid adding control valve; 54, liquid flow meter; 55, first connecting pipe; 61, exhaust and liquid filling control valve; 62, exhaust main pipe; 63, exhaust branch pipe; 64, exhaust and liquid filling control valve; 65, exhaust valve. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Embodiment 1:

[0039] like Figure 1-Figure 4 , Figure 8-Figure 11 As shown, a liquid metering device comprises a control component 1, a mounting base 2 and a housing 3 arranged on the mounting base 2, wherein a weight metering component 4 and a flow metering component 5 are arranged inside the housing 3;

[0040] The control assembly 1 includes a PLC 11, a weighing module 12, a display screen 13 and several motor control plugs 14, and the PLC 11 is electrically connected to the weighing module 12, the display screen 13 and several motor control plugs 14 respectively;

[0041] The weight metering component 4 includes at least one metering bin 41 arranged inside the shell 3, and the metering bin 41 is provided with a liquid replenishing component 42 and a liquid outlet component 43 which are connected to the inside and one end of which extends to the outside of the shell 3 respectively, and the liquid replenishing component 42 and the liquid outlet component 43 are respectively provided with a liquid replenishing control valve 44 and a liquid outlet control valve 45, and each of the metering bins 41 is respectively provided with a weighing sensor 46 at the bottom, and the weighing sensor 46 is electrically connected to the weighing module 12, and the liquid replenishing control valve 44 and the liquid outlet control valve 45 are respectively electrically connected to the PLC11;

[0042] The flow metering component 5 includes a liquid adding inlet pipe 51 and a liquid adding outlet pipe 52 which are interconnected, and a flow metering pipeline is formed between the liquid adding inlet pipe 51 and the liquid adding outlet pipe 52. A liquid adding control valve 53 and a liquid flow meter 54 are sequentially arranged on the flow metering pipeline along the liquid running direction, and the liquid adding control valve 53 and the liquid flow meter 54 are electrically connected to PLC11 respectively.

[0043] In this embodiment, there is one metering bin 41, and the fluid replenishment component 42 includes a fluid replenishment branch pipe 422 and a fluid replenishment main pipe 421 connected to the fluid replenishment branch pipe 422 and extending to the outside of the shell 3, and there is one fluid replenishment control valve 44 and arranged on the fluid replenishment branch pipe 422 or the fluid replenishment main pipe 421.

[0044] In this embodiment, there is one metering bin 41, and the liquid outlet component 43 includes a liquid outlet branch pipe 432 and a liquid outlet main pipe 431 connected to the liquid outlet branch pipe 432 and extending to the outside of the shell 3, and there is one liquid outlet control valve 45 and arranged on the liquid outlet branch pipe 432 or the liquid outlet main pipe 431.

[0045] In this embodiment, the metering bin 41 includes a bin body 411 and a movable cover 412 detachably connected to the bin body 411, and the movable cover 412 is provided with a liquid infusion port 413 and a liquid outlet port 414 which are connected to the interior of the bin body 411 and extend to the outside of the movable cover 412, and the liquid infusion branch pipe 422 and the liquid outlet branch pipe 432 respectively pass through the liquid infusion port 413 and the liquid outlet port 414 and extend to a position near the bottom of the inner side of the bin body 411.

[0046] In this embodiment, a limiting annular protrusion 415 with a diameter larger than that of the feed pipe and the liquid outlet pipe and extending upward is provided at a position on the movable cover plate 412 corresponding to the liquid replenishment port 413 and the liquid outlet port 414. The liquid replenishment branch pipe 422 sequentially passes through the liquid replenishment port 413 and the limiting annular protrusion 415 and extends to a position near the bottom of the inner side of the warehouse body 411. The liquid outlet branch pipe 432 sequentially passes through the liquid outlet port 414 and the limiting annular protrusion 415 and extends to a position near the bottom of the inner side of the warehouse body 411. When the liquid replenishment branch pipe 422 and the liquid outlet branch pipe 432 pass through the limiting annular protrusion 415, a gap 416 is formed between the liquid replenishment branch pipe 422 and the liquid outlet branch pipe 432 and the limiting annular protrusion 415.

[0047] In this embodiment, a drain pipe 417 communicating with the interior of each bin body 411 is disposed on the side near the bottom thereof, and a drain valve 418 is disposed on the drain pipe 417 .

[0048] In this embodiment, the control component 1 further includes an emergency stop button 15 and a frequency converter 16 , and the emergency stop button 15 and the frequency converter 16 are electrically connected to the PLC 11 , respectively.

[0049] In this embodiment, an exhaust component 6 is also included, and the exhaust component 6 includes an exhaust and liquid replenishment control valve 61, an exhaust main pipe 62 and exhaust branch pipes 63 whose number is the same as the number of liquid outlet branch pipes 432. The two ends of the exhaust and liquid replenishment control valve 61 are respectively connected to the liquid replenishment main pipe 421 and the liquid outlet main pipe 431. An exhaust and liquid replenishment control valve 64 is provided on the exhaust and liquid replenishment control valve 61. One end of each of the exhaust branch pipes 63 is respectively connected to each liquid outlet branch pipe 432, and the other end of each of the exhaust branch pipes 63 is connected to the exhaust main pipe 62. At least one exhaust valve 65 is provided on the exhaust main pipe 62.

[0050] In this embodiment, a weight measurement step is included, which is as follows: First, the upper and lower weight limits of the metering bin 41 are set. Liquid pumps are respectively set on the liquid replenishment main pipe 421 and the liquid outlet main pipe 431 to assist the flow of liquid. The motor of the liquid pump is connected to the motor control plug 14. Through this connection, the PLC11 can control the start and stop of the liquid pump through the motor control plug 14. When the liquid is inlet, the liquid outlet control valve 45 is closed by the PLC11, the liquid replenishment control valve 44 is opened, and the liquid pump at the end of the liquid replenishment main pipe 421 is turned on. The liquid enters from the liquid replenishment main pipe 421 and enters the metering bin 41 through the liquid replenishment branch pipe 422. The weighing sensor 46 records the weight of the liquid in the metering bin 41 in real time, and outputs the measured weight data to the weighing module 12. The PLC11 obtains the data of the weighing module 12, performs logical operations based on the obtained data, controls the operation of each component, and displays it in real time on the display screen 13.

[0051] If the weight of the measured liquid is small and can be measured by one metering bin 41, the measured and displayed weight of the liquid is the weight of the liquid to be measured. For example, if the amount of liquid is large, when the weight in the metering bin 41 reaches the upper weight limit, PLC11 controls the liquid replenishment control valve 44 and the liquid pump at the end of the liquid replenishment main pipe 421 to close, opens the liquid outlet control valve 45, opens the liquid pump at the liquid outlet main pipe 431, and the liquid in the metering bin 41 is pumped out. When the weight of the liquid in the metering bin 41 is at the lower weight limit, PLC11 controls the liquid outlet control valve 45 and the liquid pump at the liquid outlet main pipe 431 to close, and reopens the liquid replenishment control valve 44 and the liquid pump at the end of the liquid replenishment main pipe 421 to measure again. Repeat the cycle until the measurement is completed, and the sum of the weights measured several times is the weight of the liquid to be measured.

[0052] Embodiment 2:

[0053] like Figure 1 , Figure 5-Figure 11 As shown, a liquid metering device comprises a control component 1, a mounting base 2 and a housing 3 arranged on the mounting base 2, wherein a weight metering component 4 and a flow metering component 5 are arranged inside the housing 3;

[0054] The control assembly 1 includes a PLC 11, a weighing module 12, a display screen 13 and several motor control plugs 14, and the PLC 11 is electrically connected to the weighing module 12, the display screen 13 and several motor control plugs 14 respectively;

[0055] The weight metering component 4 includes at least one metering bin 41 arranged inside the shell 3, and the metering bin 41 is provided with a liquid replenishing component 42 and a liquid outlet component 43 which are connected to the inside and one end of which extends to the outside of the shell 3 respectively, and the liquid replenishing component 42 and the liquid outlet component 43 are respectively provided with a liquid replenishing control valve 44 and a liquid outlet control valve 45, and each of the metering bins 41 is respectively provided with a weighing sensor 46 at the bottom, and the weighing sensor 46 is electrically connected to the weighing module 12, and the liquid replenishing control valve 44 and the liquid outlet control valve 45 are respectively electrically connected to the PLC11;

[0056] The flow metering component 5 includes a liquid adding inlet pipe 51 and a liquid adding outlet pipe 52 which are interconnected, and a flow metering pipeline is formed between the liquid adding inlet pipe 51 and the liquid adding outlet pipe 52. A liquid adding control valve 53 and a liquid flow meter 54 are sequentially arranged on the flow metering pipeline along the liquid running direction, and the liquid adding control valve 53 and the liquid flow meter 54 are electrically connected to PLC11 respectively.

[0057] In this embodiment, when there are at least two metering bins 41, the fluid replenishment component 42 includes a fluid replenishment branch pipe 422 whose number is the same as the number of the metering bins 41 and a fluid replenishment main pipe 421 extending to the outside of the shell 3, one end of each of the fluid replenishment branch pipes 422 is respectively connected to each metering bin 41, and the other end of each of the fluid replenishment branch pipes 422 is connected to the fluid replenishment main pipe 421, and the number of the fluid replenishment control valves 44 is the same as the number of the metering bins 41 and is respectively arranged on each of the fluid replenishment branch pipes 422.

[0058] In this embodiment, when there are at least two metering bins 41, the liquid outlet assembly 43 includes a number of liquid outlet branches 432 that is the same as the number of metering bins 41 and a liquid outlet main pipe 431 extending to the outside of the shell 3, one end of each of the liquid outlet branches 432 is connected to each metering bin 41, and the other end of each of the liquid outlet branches 432 is connected to the liquid outlet main pipe 431, and the number of the liquid outlet control valves 45 is the same as the number of the metering bins 41 and is respectively arranged on each of the liquid outlet branches 432.

[0059] In this embodiment, the metering bin 41 includes a bin body 411 and a movable cover 412 detachably connected to the bin body 411, and the movable cover 412 is provided with a liquid infusion port 413 and a liquid outlet port 414 which are connected to the interior of the bin body 411 and extend to the outside of the movable cover 412, and the liquid infusion branch pipe 422 and the liquid outlet branch pipe 432 respectively pass through the liquid infusion port 413 and the liquid outlet port 414 and extend to a position near the bottom of the inner side of the bin body 411.

[0060] In this embodiment, a limiting annular protrusion 415 with a diameter larger than that of the feed pipe and the liquid outlet pipe and extending upward is provided at a position on the movable cover plate 412 corresponding to the liquid replenishment port 413 and the liquid outlet port 414. The liquid replenishment branch pipe 422 sequentially passes through the liquid replenishment port 413 and the limiting annular protrusion 415 and extends to a position near the bottom of the inner side of the warehouse body 411. The liquid outlet branch pipe 432 sequentially passes through the liquid outlet port 414 and the limiting annular protrusion 415 and extends to a position near the bottom of the inner side of the warehouse body 411. When the liquid replenishment branch pipe 422 and the liquid outlet branch pipe 432 pass through the limiting annular protrusion 415, a gap 416 is formed between the liquid replenishment branch pipe 422 and the liquid outlet branch pipe 432 and the limiting annular protrusion 415.

[0061] In this embodiment, a drain pipe 417 communicating with the interior of each bin body 411 is disposed on the side near the bottom thereof, and a drain valve 418 is disposed on the drain pipe 417 .

[0062] In this embodiment, the control component 1 further includes an emergency stop button 15, and the emergency stop button 15 is electrically connected to the PLC 11 respectively.

[0063] In this embodiment, an exhaust component 6 is also included, and the exhaust component 6 includes an exhaust and liquid replenishment control valve 61, an exhaust main pipe 62 and exhaust branch pipes 63 whose number is the same as the number of liquid outlet branch pipes 432. The two ends of the exhaust and liquid replenishment control valve 61 are respectively connected to the liquid replenishment main pipe 421 and the liquid outlet main pipe 431. An exhaust and liquid replenishment control valve 64 is provided on the exhaust and liquid replenishment control valve 61. One end of each of the exhaust branch pipes 63 is respectively connected to each liquid outlet branch pipe 432, and the other end of each of the exhaust branch pipes 63 is connected to the exhaust main pipe 62. At least one exhaust valve 65 is provided on the exhaust main pipe 62.

[0064] In this embodiment, if weight measurement is performed, and the weight of the measured liquid is small and can be measured by one measuring bin 41, the measuring method is consistent with that in embodiment 1.

[0065] When the weight of the liquid to be measured is large and can be measured by multiple measuring bins 41, the multiple measuring bins 41 can be filled in sequence and then the liquid can be discharged. The sum of the weights measured by the multiple measuring bins 41 is the weight of the liquid to be measured.

[0066] If the weight of the measured liquid is too large and cannot be measured by the multiple metering bins 41 set up, or the weight of the measured liquid exceeds the upper limit of one metering bin 41, the method of replenishing liquid while discharging liquid can be used for measurement. In this case, there are at least two metering bins 41. The specific method is as follows: PLC11 controls the liquid replenishment control valve 44 on one of the liquid replenishment branches 422 to open, and replenishes liquid in the metering bin 41. When the corresponding metering bin 41 is replenished, PLC11 controls the corresponding liquid replenishment control valve 44 to close, and then controls the liquid replenishment control valve 44 located on another liquid replenishment branch 422 to open, and replenishes liquid in the second metering bin 41. Open the liquid outlet control valve 45 corresponding to the metering bin 41 that has completed the liquid replenishment to discharge liquid. Multiple metering bins 41 cooperate to achieve liquid inlet and liquid outlet, and complete the measurement of liquid. The weight of liquid measured by the weighing sensor 46 corresponding to the multiple metering bins 41 is the weight of liquid to be measured.

[0067] In the above two embodiments, the liquid pump is a suction pump or a centrifugal pump.

[0068] In the above two embodiments, the warehouse body 41 is provided with a limiting annular protrusion 415, which cooperates with the liquid infusion port 413 and the liquid outlet port 414 to fix the liquid infusion branch pipe 422 and the liquid outlet branch pipe 432, so that a gap 416 is formed between the liquid infusion branch pipe 422, the liquid outlet branch pipe 432 and the limiting annular protrusion 415, and the liquid infusion branch pipe 422 and the liquid outlet branch pipe 432 do not contact the warehouse body 41, thereby fully ensuring the accuracy of the measurement results.

[0069] In the above two embodiments, the arrangement of the drain pipe 417 and the drain valve 418 can drain the liquid in the bin body 411 to ensure the accuracy of the next measurement. The drain valve 418 is arranged as a manual valve and is opened manually according to actual use requirements.

[0070] In the above two embodiments, the setting of the emergency stop button 15 can stop the operation of the entire system when a problem occurs in the operation of the device, thereby ensuring the safety of the device.

[0071] In the above two embodiments, the inverter 16 can be set to control the inverter 16 through PLC11 according to the weight change fed back by the weighing sensor 46, and the inverter 16 changes the frequency to make the liquid pump motor run more smoothly. In practical applications, a contactor can also be used to control the start and stop of the liquid pump, but the contactor is not as stable as the inverter 16 in frequency conversion operation and has large vibration; therefore, the inverter 16 is more suitable for the above two embodiments.

[0072] In the above two embodiments, the weighing sensor 46 is mounted on the mounting base 2 through the sensor mounting plate 47. The arrangement of the sensor mounting plate 47 makes the contact between the weighing sensor 46 and the mounting base 2 and the metering bin 41 more stable, thus ensuring the accuracy of weighing.

[0073] In the above two embodiments, a buffer baffle 419 is provided at the bottom of the liquid infusion branch pipe 422. The buffer baffle 419 has a buffering effect on the liquid when the liquid enters the metering bin 41, thereby reducing the impact of the liquid's impact force on the metering result.

[0074] In the above two embodiments, a bottom valve 4110 is provided at the bottom of the liquid outlet branch pipe 432. The bottom valve 4110 is a one-way valve, which can prevent the liquid from flowing back after entering the liquid outlet branch pipe 432, thereby affecting the measurement result.

[0075] In the above two embodiments, the liquid adding inlet pipe 51 and the liquid adding outlet pipe 52 are connected through the first connecting pipe 55. According to the metering requirements, the liquid adding control valve 53 and the liquid flow meter 54 can be separately arranged on the liquid adding inlet pipe 51, the liquid adding outlet pipe 52 or the first connecting pipe 55, or all of them can be arranged on the liquid adding inlet pipe 51, the liquid adding outlet pipe 52 or the first connecting pipe 55. The arrangement of the first connecting pipe 55 can provide a certain buffer for the liquid, increase the flow time and distance of the liquid, and ensure the accuracy of the metering.

[0076] In the above two embodiments, the liquid replenishment control valve 44, the liquid outlet control valve 45 and the liquid adding control valve 53 are solenoid valves or pneumatic valves; the exhaust and liquid replenishment control valve 64 can be a solenoid valve, a pneumatic valve or a manual valve; when the exhaust and liquid replenishment control valve 64 is a solenoid valve or a pneumatic valve, it is electrically connected to PLC11.

[0077] In the above two embodiments, the number of the exhaust valve 65 is determined according to actual conditions and is set to at least one.

[0078] In the above two embodiments, a moving wheel 21 is provided at the bottom of the mounting base 2, and a push handle 31 is provided on the housing 3 to facilitate the movement of the entire device.

[0079] In the above two embodiments, PLC11 is S7-200 SMART, Delta DVP series PLC or Mitsubishi FX series PLC, etc., which is used for logic program writing and input and output control; weighing module 12 is HBM series weighing module or Mettler-Toledo series weighing module, etc., which is used to convert the analog electrical signal of weighing sensor 46 into digital signal and send it to PLC11; weighing sensor 46 is AVIC Electric Measuring weighing sensor, HBM series weighing sensor or Mettler-Toledo series weighing sensor, which converts the weight of the object into analog electrical signal; liquid flow meter 54 is Emerson series liquid flow meter or E+H series liquid flow meter, which converts the pulse signal generated by the rotation of the impeller into electrical signal and sends it to PLC11 during the liquid flow process; motor control plug 14 is New Dawn explosion-proof plug, which is used to connect the control start and stop of liquid pump. PLC11, weighing module 12, weighing sensor 46, liquid flow meter 54 and motor control plug 14 are not limited to the above brands and models, and other brands and models that can achieve the same effect are applicable to the above two embodiments.

[0080] The above two embodiments also include a flow metering step, which is as follows: a liquid pump is respectively provided on the liquid adding inlet pipe 51 and the liquid adding outlet pipe 52 to assist the liquid flow. The motor of the liquid pump is connected to the motor control plug 14, and the PLC11 can control the start and stop of the liquid pump through the motor control plug 14. The PLC11 controls the liquid adding control valve 53 to open, and controls the liquid pumps provided on the liquid adding inlet pipe 51 and the liquid adding outlet pipe 52 to open, the liquid enters from the liquid adding inlet pipe 51, and is discharged from the liquid adding outlet pipe 52, the liquid flow meter 54 measures the liquid flow in real time, and outputs the measured liquid flow data to the PLC11, and the PLC11 displays the received liquid flow data on the display screen 13.

[0081] In the above two embodiments, an exhaust and liquid replenishment step is also included, which is specifically as follows: PLC11 controls the closing of the liquid replenishment control valve 44 and the liquid pump at the end of the liquid outlet main pipe 431, opens the liquid outlet control valve 45 and the liquid pump at the end of the liquid replenishment main pipe 421, controls the exhaust and liquid replenishment control valve 64 to open, or manually opens the exhaust and liquid replenishment control valve 64. Liquid enters from the liquid replenishment main pipe 421. Since the liquid replenishment control valve 44 and the liquid pump at the end of the liquid outlet main pipe 431 are closed, the liquid enters the liquid replenishment connecting pipe, and then enters the liquid outlet branch pipe 432 from the liquid outlet main pipe 431, and then enters the metering chamber 41. The entry of liquid squeezes the gas retained in the metering chamber 41 out of the metering chamber 41, and the gas enters the exhaust main pipe 62 through the exhaust branch pipe 63, and then is discharged by the exhaust valve 65. The purpose of exhaust and liquid replenishment is to exhaust the gas in the liquid outlet component 43 to ensure the accuracy of measurement. At the same time, if the liquid pump is a centrifugal pump, if there is air in the pipeline, the centrifugal pump cannot extract the liquid, so the exhaust and liquid replenishment step can also ensure the smooth operation of the centrifugal pump.

[0082] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A liquid metering device, characterized in that: It comprises a control component (1), a mounting base (2) and a shell (3) arranged on the mounting base (2), wherein a weight metering component (4) and a flow metering component (5) are arranged inside the shell (3); The control component (1) comprises a PLC (11), a weighing module (12), a display screen (13) and a plurality of motor control plugs (14), wherein the PLC (11) is electrically connected to the weighing module (12), the display screen (13) and the plurality of motor control plugs (14) respectively; The weight measuring component (4) comprises at least one measuring bin (41) arranged inside the shell (3); the measuring bin (41) is provided with a liquid replenishing component (42) and a liquid outlet component (43) which are in communication with the inside and have one end extending to the outside of the shell (3); the liquid replenishing component (42) and the liquid outlet component (43) are respectively provided with a liquid replenishing control valve (44) and a liquid outlet control valve (45); each of the measuring bins (41) is respectively provided with a weighing sensor (46) at the bottom; the weighing sensor (46) is electrically connected to the weighing module (12); and the liquid replenishing control valve (44) and the liquid outlet control valve (45) are respectively electrically connected to the PLC (11); The flow metering assembly (5) comprises a liquid adding inlet pipe (51) and a liquid adding outlet pipe (52) which are interconnected, a flow metering pipeline is formed between the liquid adding inlet pipe (51) and the liquid adding outlet pipe (52), a liquid adding control valve (53) and a liquid flow meter (54) are sequentially arranged on the flow metering pipeline along the liquid running direction, and the liquid adding control valve (53) and the liquid flow meter (54) are respectively electrically connected to the PLC (11).

2. A liquid metering device according to claim 1, characterized in that: When there is one metering bin (41), the liquid replenishing assembly (42) comprises a liquid replenishing branch pipe (422) and a liquid replenishing main pipe (421) connected to the liquid replenishing branch pipe (422) and extending to the outside of the shell (3), and there is one liquid replenishing control valve (44) which is arranged on the liquid replenishing branch pipe (422) or the liquid replenishing main pipe (421).

3. A liquid metering device according to claim 2, characterized in that: When there is one metering bin (41), the liquid outlet assembly (43) comprises a liquid outlet branch pipe (432) and a liquid outlet main pipe (431) connected to the liquid outlet branch pipe (432) and extending to the outside of the shell (3), and there is one liquid outlet control valve (45) which is arranged on the liquid outlet branch pipe (432) or the liquid outlet main pipe (431).

4. A liquid metering device according to claim 1, characterized in that: When there are at least two metering bins (41), the liquid replenishment assembly (42) comprises a number of liquid replenishment branches (422) that is the same as the number of metering bins (41) and a liquid replenishment main pipe (421) extending to the outside of the shell (3); one end of each of the liquid replenishment branches (422) is respectively connected to each metering bin (41), and the other end of each of the liquid replenishment branches (422) is connected to the liquid replenishment main pipe (421); the number of the liquid replenishment control valves (44) is the same as the number of the metering bins (41) and is respectively arranged on each of the liquid replenishment branches (422).

5. A liquid metering device according to claim 4, characterized in that: When there are at least two metering bins (41), the liquid outlet assembly (43) comprises a number of liquid outlet branches (432) that is the same as the number of metering bins (41) and a liquid outlet main pipe (431) extending to the outside of the shell (3); one end of each of the liquid outlet branches (432) is respectively connected to each metering bin (41), and the other end of each of the liquid outlet branches (432) is connected to the liquid outlet main pipe (431); the number of the liquid outlet control valves (45) is the same as the number of the metering bins (41) and is respectively arranged on each of the liquid outlet branches (432).

6. A liquid metering device according to claim 3 or 5, characterized in that: The metering bin (41) comprises a bin body (411) and a movable cover plate (412) detachably connected to the bin body (411); the movable cover plate (412) is provided with a liquid infusion port (413) and a liquid outlet port (414) which are in communication with the interior of the bin body (411) and extend to the exterior of the movable cover plate (412); the liquid infusion branch pipe (422) and the liquid outlet branch pipe (432) respectively pass through the liquid infusion port (413) and the liquid outlet port (414) and extend to a position on the inner side of the bin body (411) close to the bottom.

7. A liquid metering device according to claim 6, characterized in that: A limiting annular protrusion (415) having a diameter greater than that of the feed pipe and the liquid outlet pipe and extending upward is provided at a position on the movable cover plate (412) corresponding to the liquid replenishment port (413) and the liquid outlet port (414); the liquid replenishment branch pipe (422) sequentially passes through the liquid replenishment port (413) and the limiting annular protrusion (415) and extends to a position near the bottom of the inner side of the bin body (411); the liquid outlet branch pipe (432) sequentially passes through the liquid outlet port (414) and the limiting annular protrusion (415) and extends to a position near the bottom of the inner side of the bin body (411); when the liquid replenishment branch pipe (422) and the liquid outlet branch pipe (432) pass through the limiting annular protrusion (415), a gap (416) is formed between the liquid replenishment branch pipe (422) and the liquid outlet branch pipe (432) and the limiting annular protrusion (415).

8. A liquid metering device according to claim 7, characterized in that: A liquid discharge pipe (417) communicating with the interior of each bin body (411) is provided on the side of each bin body (411) near the bottom, and a liquid discharge valve (418) is provided on the liquid discharge pipe (417).

9. A liquid metering device according to claim 1, 2, 3, 4, 5, 7 or 8, characterized in that: The control component (1) further comprises an emergency stop button (15) and a frequency converter (16), wherein the emergency stop button (15) and the frequency converter (16) are electrically connected to the PLC (11) respectively.

10. A liquid metering device according to claim 9, characterized in that: The invention also comprises an exhaust assembly (6), wherein the exhaust assembly (6) comprises an exhaust and liquid replenishment control valve (61), an exhaust main pipe (62), and exhaust branch pipes (63) whose number is the same as the number of liquid outlet branch pipes (432); the exhaust and liquid replenishment control valve (61) has two ends connected to the liquid replenishment main pipe (421) and the liquid outlet main pipe (431), respectively; the exhaust and liquid replenishment control valve (61) is provided with an exhaust and liquid replenishment control valve (64); one end of each of the exhaust branch pipes (63) is connected to each of the liquid outlet branch pipes (432), respectively; the other end of each of the exhaust branch pipes (63) is connected to the exhaust main pipe (62); and at least one exhaust valve (65) is provided on the exhaust main pipe (62).

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