A high-precision liquid material metering device and a metering method thereof

Abstract

The present invention relates to the technical field of liquid material metering, and in particular to a high-precision liquid material metering device, comprising a variable frequency pump and a support frame, wherein the outlet end of the variable frequency pump is connected to one end of a connecting pipe, the other end of the connecting pipe is connected to the upper end of a weighing bucket, a flow meter is installed on the connecting pipe, the support frame is an inverted U-shape, a weighing sensor is fixedly installed on the lower end of a cross bar of the support frame, the lower end of the weighing sensor is connected to the upper end of the weighing bucket, a first valve is also installed on the connecting pipe, and the first valve is located between the flow meter and the weighing bucket. By comparing and feedback the digital display curve of the flow meter and weighing the weight of the liquid material flowing per unit time through secondary reduction, the influence of the performance parameters of the variable frequency pump can be completely avoided, and the process of human intervention in adjusting the motor speed is reduced, and the system automatically enters and adjusts the speed in real time to ensure the accuracy of the liquid material.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid material metering, and in particular to a high-precision liquid material metering device and a metering method thereof. Background Art

[0002] The only existing technical solution is variable frequency speed regulation for continuous liquid metering. The principle of this solution is: set parameters according to the liquid value in the system, the flow rate of the pump changes with the change of the motor speed, and the motor speed can be adjusted in real time by the frequency converter. Therefore, by adjusting the frequency converter parameters, the flow rate of the pump can be adjusted in real time to achieve the continuous liquid metering value required by the equipment.

[0003] The disadvantages of this solution are: (1) When converting, we usually use the fixed flow rate of the pump to obtain the flow value when the motor rotates at 50HZ, such as YQ40-16-4, flow rate 40m 3 / h, head 16m, power 4kw; but in actual operation, affected by the pump manufacturer, there will be deviations in the actual flow rate and utilization efficiency, so the actual weighed liquid value will also be biased; (2) In the actual weighing process, affected by other materials in the front end and customer production demand, the output will be adjusted. For example, the 800G stabilized soil mixing station has a theoretical production capacity of 800t / h, the moisture content of the finished product is 5%, and the required water volume is 40t / h. However, in the actual production process, when aggregate agglomeration or the required finished product output is reduced (such as 500t / h), during the adjustment process, the liquid adjustment and aggregate and powder adjustment cannot be adjusted in real time, and there will be a 5S-10S gap. The finished product has defects and needs to be solved by intervention during the back-end paving. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a high-precision liquid material metering device and a metering method thereof.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-precision liquid material metering device comprises a variable frequency pump and a support frame, wherein the outlet end of the variable frequency pump is connected to one end of a connecting pipe, the other end of the connecting pipe is connected to the upper end of a weighing bucket, a flow meter is installed on the connecting pipe, the support frame is an inverted U-shape, a weighing sensor is fixedly installed on the lower end of a cross bar of the support frame, the lower end of the weighing sensor is connected to the upper end of the weighing bucket, a first valve is also installed on the connecting pipe, the first valve is located between the flow meter and the weighing bucket, a discharge port is provided on the side wall of the weighing bucket, and a second valve is installed at the lower end of the weighing bucket.

[0007] Preferably, the connecting pipe is also provided with two corresponding rubber flexible joints, and the rubber flexible joints are located on both sides of the flow meter.

[0008] Preferably, it also includes support rods, the number of which is two, the support rods are located on both sides of the flow meter, the support rods are fixedly connected to the outer wall of the connecting pipe, and the support rods are located between the rubber flexible joints.

[0009] Preferably, the support rod includes a fixed rod and a movable rod, the fixed rod and the movable rod are fixedly connected by screws, a semicircular first groove is opened at the upper end of the fixed rod, and a corresponding second groove is opened at the lower end of the movable rod, the first groove and the second groove cooperate to form a circular hole, and a rubber layer is glued to the inner walls of the first groove and the second groove.

[0010] Preferably, the rubber layer is in contact with the outer wall of the connecting pipe, and the inner diameter of the ring formed by the rubber layer is larger than the outer diameter of the connecting pipe.

[0011] Preferably, the flow meter is a vortex flow meter.

[0012] Preferably, it also includes a single chip microcomputer, which is electrically connected to the variable frequency pump, the flow meter and the weighing sensor respectively.

[0013] Preferably, a high-precision liquid material metering method comprises the following steps:

[0014] S1. The liquid material is extracted by a frequency conversion pump, and the flow meter displays and feeds back the liquid material flow in real time, and then the weighing sensor calculates the weight of the liquid material flowing through the weighing bucket per unit time;

[0015] S2. Adjust the frequency converter according to the measured values ​​of the flow meter and weighing sensor to control the speed and flow of the variable frequency pump, thereby achieving real-time and accurate measurement of liquid materials.

[0016] Preferably, the weighing sensor performs measurement by means of secondary reduction measurement.

[0017] The beneficial effects of the present invention are:

[0018] 1. By comparing and feedback the digital display curve of the flow meter and weighing the weight of the liquid material flowing per unit time through secondary reduction, the influence of the performance parameters of the variable frequency pump can be completely avoided, and the process of human intervention in adjusting the motor speed can be reduced. Instead, the system automatically enters and adjusts the speed in real time to ensure the accuracy of the liquid material.

[0019] 2. When the equipment output encounters abnormal conditions and the output decreases, the liquid material precise metering system can provide real-time feedback and automatically adjust the liquid material supply to meet the metering requirements and produce qualified finished products. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the main structure of a high-precision liquid material metering device proposed by the present invention;

[0021] Figure 2 A schematic diagram of the three-dimensional structure of a high-precision liquid material metering device proposed by the present invention;

[0022] Figure 3 This is a schematic structural diagram of a support rod of a high-precision liquid material metering device proposed by the present invention.

[0023] In the figure: 1 frequency conversion pump, 2 connecting pipe, 3 rubber flexible joint, 4 flow meter, 5 support rod, 6 first valve, 7 support frame, 8 weighing sensor, 9 weighing bucket, 10 discharge port, 11 second valve, 51 fixed rod, 52 movable rod, 53 rubber layer. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference Figure 1-3 A high-precision liquid material metering device comprises a variable frequency pump 1 and a support frame 7, the outlet end of the variable frequency pump 1 is connected to one end of a connecting pipe 2, the other end of the connecting pipe 2 is connected to the upper end of a weighing bucket 9, a flow meter 4 is installed on the connecting pipe 2, the support frame 7 is an inverted U-shape, a weighing sensor 8 is fixedly installed on the lower end of the cross bar of the support frame 7, the lower end of the weighing sensor 8 is connected to the upper end of the weighing bucket 9, a first valve 6 is also installed on the connecting pipe 2, the first valve 6 is located between the flow meter 4 and the weighing bucket 9, a discharge port 10 is provided on the side wall of the weighing bucket 9, and a second valve 11 is installed at the lower end of the weighing bucket 9.

[0026] Furthermore, the connecting pipe 2 is also provided with two corresponding rubber flexible joints 3 , and the rubber flexible joints 3 are located on both sides of the flow meter 4 .

[0027] Furthermore, it also includes support rods 5, the number of which is two, the support rods 5 are located on both sides of the flow meter 4, the support rods 5 are fixedly connected to the outer wall of the connecting pipe 2, and the support rods 5 are located between the rubber flexible joints 3.

[0028] Furthermore, the support rod 5 includes a fixed rod 51 and a movable rod 52, which are fixedly connected by screws. A semicircular first groove is provided at the upper end of the fixed rod 51, and a corresponding second groove is provided at the lower end of the movable rod 52. The first groove and the second groove cooperate to form a circular hole, and a rubber layer 53 is glued to the inner walls of the first groove and the second groove.

[0029] Furthermore, the rubber layer 53 contacts the outer wall of the connecting pipe 2. The inner diameter of the ring formed by the rubber layer 53 is larger than the outer diameter of the connecting pipe 2. The connecting pipe 2 plays a certain shock-absorbing role through the support rod 5, which can improve the accuracy of the flow meter 4 readings to a certain extent.

[0030] Furthermore, the flow meter 4 is a vortex flow meter.

[0031] Furthermore, it also includes a single chip microcomputer, which is electrically connected to the variable frequency pump 1, the flow meter 4 and the weighing sensor 8 respectively.

[0032] Furthermore, a high-precision liquid material metering method comprises the following steps:

[0033] S1, extract the liquid material through the frequency conversion pump 1, and use the flow meter 4 to display and feedback the liquid material flow in real time, and then use the weighing sensor 8 to calculate the weight of the liquid material flowing through the weighing bucket per unit time;

[0034] S2. Adjust the frequency converter according to the measured values ​​of the flow meter 4 and the weighing sensor 8 to control the speed and flow of the variable frequency pump 1, thereby achieving real-time and accurate measurement of the liquid material.

[0035] Furthermore, the weighing sensor 8 performs measurement by means of secondary reduction measurement.

[0036] In this embodiment, by comparing and feedback the digital display curve of the flow meter and weighing the weight of the liquid material flowing per unit time by secondary reduction, the influence of the performance parameters of the variable frequency pump can be completely avoided, and the process of human intervention in adjusting the motor speed can be reduced. Instead, the system automatically enters and adjusts the speed in real time to ensure the accuracy of the liquid material.

[0037] When the equipment output encounters abnormal conditions and output decreases, the liquid material precise metering system can provide real-time feedback and automatically adjust the liquid material supply to meet the metering requirements and produce qualified finished products.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-precision liquid material metering device, comprising a variable frequency pump (1) and a support frame (7), characterized in that: The outlet end of the variable frequency pump (1) is connected to one end of a connecting pipe (2), the other end of the connecting pipe (2) is connected to the upper end of a weighing bucket (9), a flow meter (4) is installed on the connecting pipe (2), the support frame (7) is an inverted U-shape, a weighing sensor (8) is fixedly installed at the lower end of a cross bar of the support frame (7), the lower end of the weighing sensor (8) is connected to the upper end of the weighing bucket (9), a first valve (6) is also installed on the connecting pipe (2), the first valve (6) is located between the flow meter (4) and the weighing bucket (9), a discharge port (10) is provided on the side wall of the weighing bucket (9), and a second valve (11) is installed at the lower end of the weighing bucket (9); The connecting pipe (2) is also provided with two mutually corresponding rubber flexible joints (3), and the rubber flexible joints (3) are located on both sides of the flow meter (4); It also includes support rods (5), the number of the support rods (5) is two, the support rods (5) are located on both sides of the flow meter (4), the support rods (5) are fixedly connected to the outer wall of the connecting pipe (2), and the support rods (5) are located between the rubber flexible joints (3); The support rod (5) comprises a fixed rod (51) and a movable rod (52), the fixed rod (51) and the movable rod (52) being fixedly connected by screws, the upper end of the fixed rod (51) being provided with a semicircular first groove, the lower end of the movable rod (52) being provided with a corresponding second groove, the first groove and the second groove being matched to form a circular hole, and the inner walls of the first groove and the second groove being both glued with a rubber layer (53); The rubber layer (53) is in contact with the outer wall of the connecting pipe (2), and the inner diameter of the ring formed by the rubber layer (53) is larger than the outer diameter of the connecting pipe (2); the flow meter (4) is a vortex flow meter; It also includes a single chip microcomputer, which is electrically connected to the variable frequency pump (1), the flow meter (4) and the weighing sensor (8) respectively; The metering method of the high-precision liquid material metering device comprises the following steps: S1, extracting liquid material through the frequency conversion pump (1), displaying and feeding back the amount of liquid material passing through the flow meter (4) in real time, and then calculating the weight of the liquid material flowing through the weighing bucket per unit time through the weighing sensor (8); S2, adjusting the frequency converter according to the measured values ​​of the flow meter (4) and the weighing sensor (8), controlling the speed and flow rate of the variable frequency pump (1), thereby achieving real-time and accurate measurement of the liquid material; The weighing sensor (8) performs measurement by means of secondary reduction measurement.

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