CN109238415B

CN109238415B - Liquid weighing device

Info

Publication number: CN109238415B
Application number: CN201811248916.3A
Authority: CN
Inventors: 曾斌; 杨振华; 吴俊�
Original assignee: Sany Automobile Manufacturing Co Ltd
Current assignee: Sany Automobile Manufacturing Co Ltd
Priority date: 2018-10-25
Filing date: 2018-10-25
Publication date: 2024-01-30
Anticipated expiration: 2038-10-25
Also published as: CN109238415A

Abstract

The invention relates to the field of metering devices, in particular to a liquid weighing device. The liquid weighing device comprises a tank body, a connecting pipe, a liquid scale and a liquid storage tank; the tank body is internally provided with a fluid supplementing cavity and a piston for changing the volume of the fluid supplementing cavity; the connecting pipe comprises a first weighing pipe and a first liquid storage pipe, the liquid supplementing cavity is communicated with the liquid scale through the first weighing pipe, and the liquid supplementing cavity is also communicated with the lower part of the liquid storage tank through the first liquid storage pipe; valves are arranged on the first weighing pipe and the first liquid storage pipe. According to the invention, the tank body is arranged between the liquid storage tank and the liquid scale, so that the weighing precision is improved, and the problem of larger metering error under a large range in the liquid weighing process in the prior art is solved.

Description

Liquid weighing device

Technical Field

The invention relates to the field of metering devices, in particular to a liquid weighing device.

Background

Concrete is one of the most important civil engineering materials in the current generation. The artificial stone is prepared from cementing material, granular aggregate (also called aggregate), water, and additives and admixtures added if necessary according to a certain proportion, and is prepared by uniformly stirring, compacting, shaping, curing and hardening. The concrete has the characteristics of rich raw materials, low price, simple production process, high compressive strength, good durability, wide strength grade range and the like. These characteristics make the range of use of concrete quite wide.

Concrete formulations contain various liquid raw materials such as water-in-liquid external agents. The accuracy of the weighing of the liquid raw materials determines the quality of the concrete. The measuring range and the measuring precision of the liquid scale are limited (the precision of the high measuring range is generally low), and the measuring error in the precision range can be only selected and accepted. Therefore, there is a need for improvements in the liquid scale that increase the accuracy of the liquid scale over a wide range.

Disclosure of Invention

The invention aims to provide a liquid weighing device, which solves the problem of larger metering error under a wide range in the liquid weighing process in the prior art.

The invention provides a liquid weighing device, which comprises a tank body, a connecting pipe, a liquid scale and a liquid storage tank;

a fluid supplementing cavity and a piston for changing the volume of the fluid supplementing cavity are arranged in the tank body;

the connecting pipe comprises a first weighing pipe and a first liquid storage pipe, the liquid supplementing cavity is communicated with the liquid scale through the first weighing pipe, and the liquid supplementing cavity is also communicated with the lower part of the liquid storage tank through the first liquid storage pipe;

valves are arranged on the first weighing pipe and the first liquid storage pipe.

Further, a buckling cavity is further formed in the tank body, and the connecting pipe further comprises a second weighing pipe and a second liquid storage pipe;

the piston is also used for changing the volume of the buckling cavity;

the buckling and weighing cavity is connected with the lower part of the liquid scale through a second weighing pipe, and is also connected with the liquid storage tank through a second liquid storage pipe;

valves are arranged on the second weighing pipe and the second liquid storage pipe.

Further, the tank body is a piston cylinder, the fluid supplementing cavity and the buckling cavity are respectively positioned at two sides of the piston, and the piston is in sliding fit in the piston cylinder.

Further, the tank body is also connected with a vent pipe; the breather pipe is connected with the buckling cavity; the vent pipe is provided with a valve.

Further, the piston is connected with a driving mechanism for driving the piston to slide.

Further, the valve is an electric valve.

Further, the liquid weighing device further comprises a control unit, wherein the control unit is electrically connected with the driving mechanism and the electric valve, and the control unit is used for receiving and processing the compensation weighing instruction and controlling the actions of the driving mechanism and the electric valve.

Further, the liquid weighing device further comprises a man-machine interaction unit, wherein the man-machine interaction unit is electrically connected with the control unit, and the man-machine interaction unit is used for receiving parameters, displaying information and sending instructions to the control unit.

Further, the liquid weighing device further comprises an alarm prompting unit, wherein the alarm prompting unit is arranged near the tank body and is electrically connected with the control unit and used for alarming and prompting the tank body.

Further, the connecting pipe is a hose.

According to the liquid weighing device, the tank body is arranged between the liquid storage tank and the liquid scale, the liquid scale and the liquid storage tank are respectively connected through the first weighing pipe and the first liquid storage pipe, the weight is converted into the volume according to the liquid density, and the movement of the piston and the opening and closing of each valve are matched; the liquid weighing device provided by the invention realizes the compensation and buckling of the liquid scale, and improves the weighing precision, thereby solving the problem of larger metering error under a large range in the liquid weighing process in the prior art.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a liquid weighing apparatus according to embodiment 1 of the present invention;

FIG. 2 is a schematic view of a liquid weighing apparatus according to embodiment 2 of the present invention;

FIG. 3 is a schematic view of a liquid weighing apparatus according to embodiment 3 of the present invention;

FIG. 4 is a flow chart of the liquid weighing apparatus shown in FIG. 3 when buckled;

fig. 5 is a flow chart of the liquid weighing apparatus shown in fig. 3 when the liquid weighing apparatus is replenished.

In the figure, 1 is a tank body; 101-a fluid supplementing cavity; 102-buckling a cavity; 103-a piston; 104-a vent pipe; 104 a-vent valve; 121-a first weighing tube; 121 a-a first weighing tube valve; 122-a second weighing tube; 122 a-a second weighing tube valve; 131-a first reservoir; 131 a-a first reservoir valve; 132-a second reservoir; 132 a-a second reservoir valve; 2-liquid weighing; 201-liquid is called working liquid level; 3-a liquid storage tank; 301—working fluid level of the reservoir.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

Referring to fig. 1, fig. 1 is a schematic structural diagram of a liquid weighing apparatus according to embodiment 1 of the present invention. The liquid weighing device in the embodiment comprises a tank body 1, a connecting pipe, a liquid scale 2 and a liquid storage tank 3;

the tank body 1 is a piston cylinder with a uniform section, and a fluid supplementing cavity 101 and a piston 103 which is in sliding fit in the tank body and is used for changing the volume of the fluid supplementing cavity are arranged in the tank body 1; the lower part of the tank body 1 is designed as a fluid supplementing cavity 101, and the fluid supplementing cavity 101 can be arranged at the upper part of the tank body 1.

The connecting pipe comprises a first weighing pipe 121 and a first liquid storage pipe 131, the liquid supplementing cavity 101 is communicated with the liquid scale 2 through the first weighing pipe 121, and the liquid supplementing cavity 101 is also communicated with the lower part of the liquid storage tank 3 through the first liquid storage pipe 131;

valves are provided on the first weighing tube 121 and the first reservoir tube 131.

In the embodiment 1, the first weighing pipe 121 is connected below the working liquid level 201, and the first liquid storage pipe 131 is connected below the working liquid level 301; the valve connected to the first weighing tube 121 is a first weighing tube valve 121a, and the valve connected to the first liquid storage tube 131 is a first liquid storage tube valve 131a.

Specifically, the can body 1 in this embodiment is a sealed cylindrical can body, and each section is uniform. The tank 1 may have other shapes with uniform cross sections, such as rectangular parallelepiped. The section of the tank body 1 is uniform, when the piston 103 moves a certain distance, the volume change of the fluid supplementing cavity 101 can be calculated by the section area of the tank body 1 and the moving distance of the piston 103, and accordingly the volume (weight) of the fluid to be supplemented or buckled can be controlled.

As shown in fig. 1, analysis of the above connection relationship can be seen: the fluid infusion cavity 101 is communicated with the liquid scale 2 through a first weighing pipe 121, and the fluid infusion cavity 101 is also communicated with the lower part of the liquid storage tank 3 through a first liquid storage pipe 131; in order to achieve the functions of the fluid infusion chamber 101, as shown in the embodiment of fig. 1, the first weighing tube 121 and the first liquid storage tube 131 are respectively connected with the liquid infusion device 2 and the liquid storage tank 3, and the connection positions are all below the working liquid levels of the liquid infusion device 2 and the liquid storage tank 3 (if the connection positions of the first weighing tube 121 and the liquid infusion device 2 are all above the working liquid level of the liquid infusion device 2, only the fluid infusion can be achieved, and the fluid infusion device cannot be buckled).

In this embodiment, the first weighing tube 121 and the first liquid storage tube 131 are connected to the liquid surface side of the piston 103 in the liquid replenishing chamber 101. In the weighing process, the liquid tank 3 rapidly fills the liquid scale 2 through a special pipeline (not shown) until the weight of the liquid in the liquid scale 2 approaches the set weight (of course, the first weighing pipe valve 121a and the first liquid storage pipe valve 131a may be opened, and the liquid may be filled into the liquid scale 2 through the pipelines of the first weighing pipe 121 and the first liquid storage pipe 131 communicating with the tank 1). At this time, since the weight of the liquid in the liquid scale 2 is different from the set value, two cases are included: first case: the weight of the liquid in the liquid scale 2 is larger than a set value; second case: the weight of the liquid in the liquid scale 2 is smaller than the set value. In the first case, the liquid part in the liquid scale 2 needs to be removed, and the process is a buckling process; in the second case, a certain amount of liquid needs to be continuously added to the liquid scale 2, and this process is called a compensation process.

In the initial state, the piston 103 is located at a position in the middle of the tank 1 in fig. 1, and the first weighing tube valve 121a and the first liquid storage tube valve 131a are both closed.

When the liquid balance 2 is to be supplemented, the first liquid storage pipe valve 131a is closed, the first weighing pipe valve 121a is opened, and the piston 103 moves downwards for a preset distance, so that the liquid in the tank 1 (namely the liquid supplementing cavity 101) enters the liquid balance 2 under the pressure effect, and the purpose of supplementing the liquid balance is achieved. However, in the process of replenishing, if the liquid in the liquid replenishing cavity 101 is insufficient to replenish the liquid in the liquid scale 2, at this time, the first liquid storage pipe valve 131a may be opened first, so that the piston 103 moves upwards by a certain distance according to the calculation result, and a certain volume of liquid in the liquid storage tank 3 enters the tank body 1, so as to ensure that a larger amount of liquid exists in the tank body 1, and then replenishing is performed.

When the liquid scale 2 is buckled, the first weighing pipe valve 121a is opened, the piston 103 moves upwards by a certain distance according to the calculation result, and a certain volume of liquid in the liquid scale 2 enters the liquid supplementing cavity 101 (the liquid supplementing cavity 101 is simultaneously provided with the cavity requirements of the supplementing and buckling) of the tank body 1, so that the buckling of the liquid scale 2 is completed. However, during the above-described buckling, if the tank 1 is full or nearly full, the first weighing tube valve 121a is closed, the first liquid storage tube valve 131a is opened, and the piston 103 is moved downward to the lower position, so that the tank 1 is transferred into the liquid storage tank 3.

The power of the liquid flow during the balance and the buckling is provided by the hydraulic pressure formed by the piston 103, so that the up-down direction of the tank 1 in fig. 1 does not affect the design.

Example two

Referring to fig. 2, fig. 2 is a schematic structural diagram of a liquid weighing apparatus according to embodiment 2 of the present invention. The liquid weighing device provided by the embodiment 2 of the invention comprises a tank body 1, a connecting pipe, a liquid scale 2 and a liquid storage tank 3; the tank body 1 is internally provided with a fluid infusion cavity 101 and a piston 103 which is slidably matched in the fluid infusion cavity and is used for changing the volume of the fluid infusion cavity; the connecting tubes include a first weighing tube 121 and a first reservoir tube 131, with some additional connecting tubes added; the liquid weighing apparatus in this embodiment differs from that of embodiment 1 in that a second weighing tube 122, a second liquid storage tube 132 and a balance chamber 102 are added (note that the balance chamber 102 is the fluid-filling chamber 101 in this case, and the two chambers are identical, that is, the fluid-filling chamber 101 in fig. 1 and 2 is identical to the balance chamber 102 (the fluid-filling chamber 101 is actually identical to the balance chamber 102)). The buckling and weighing cavity 102 is connected with the lower part of the liquid scale 2 through a second weighing pipe 122, and the buckling and weighing cavity 102 is also connected with the liquid storage tank 3 through a second liquid storage pipe 132; valves are provided on the second weighing tube 122 and the second reservoir 132.

As shown in fig. 2, in the initial state, the piston 103 is located at a predetermined position in the tank 1 in the drawing, and the first weighing tube valve 121a, the second weighing tube valve 122a, the first liquid storage tube valve 131a and the second liquid storage tube valve 132a are all closed. The second liquid storage pipe valve 132a is opened, the piston 103 moves upwards by a certain distance according to the calculation result, and a certain volume of liquid in the liquid storage tank 3 enters the tank body 1.

When the liquid balance 2 is to be balanced, the first weighing pipe valve 121a is opened (all other valves are closed at the moment), so that the piston 103 moves downwards, and liquid in the tank 1 enters the liquid balance 2 under the action of pressure in the process, thereby realizing the purpose of balanced balance of the liquid balance 2. In the above-mentioned replenishing process, there may be a case where the liquid in the tank 1 is insufficient, in which case the second liquid storage tube valve 132a needs to be opened (other valves are closed), and the piston 103 moves upward by a certain distance, so that a certain volume of liquid in the liquid storage tank 3 enters the tank 1 to be replenished.

When the liquid scale 2 is buckled, the second weighing pipe valve 122a is opened (all other valves are closed at the moment), and the piston 103 moves upwards by a certain distance according to the calculation result, so that a certain volume of liquid in the liquid scale 2 enters the tank 1, and the purpose of buckling is achieved. However, during the above-mentioned buckling process, if the tank 1 is full or nearly full, the second weighing tube valve 122a is closed, the second liquid storage tube valve 132a (or the first liquid storage tube valve 131 a) is opened, the piston 103 is moved downward to the lower position, and the liquid in the tank 1 is transferred into the liquid storage tank 3.

Example III

Referring to fig. 3, the liquid weighing device in the present embodiment includes a tank 1, a piston, a connecting pipe, and a vent pipe; the tank body 1 is internally provided with a fluid infusion cavity 101 and a piston 103 which is slidably matched in the fluid infusion cavity and is used for changing the volume of the fluid infusion cavity; the connecting pipe comprises a first weighing pipe 121 and a first liquid storage pipe 131, and meanwhile, some technical structures are added on the basis of the scheme of the embodiment 1; for example: which adds second weighing tube 122 and second reservoir 132, vent tube 104, and weigh cavity 102; the breather pipe is connected with the buckling cavity; the vent tube is provided with a valve (i.e., vent tube valve 104 a). In fig. 3, the fluid-supplementing chamber 101 and the buckling chamber 102 are two chambers on two sides of the piston 103.

In the initial state, the piston 103 is located at a predetermined position in the tank 1 in the drawing, and the first weighing tube valve 121a, the second weighing tube valve 122a, the first reservoir tube valve 131a and the second reservoir tube valve 132a are all closed.

When the liquid balance 2 is to be balanced, the second weighing pipe valve 121a is opened (at this time, the vent pipe valve 104a should be opened, and other valves are in a closed state), and the piston 103 moves upwards by a certain distance according to the calculation result, so that a certain volume of liquid in the liquid compensation cavity 101 of the tank 1 enters the liquid balance 2, thereby achieving the purpose of balanced balance of the liquid balance 2. In the above process, the vent valve 104a should be opened (i.e. to ensure that the piston 103 moves upward smoothly), so as to avoid the vacuum pumping of the tank 1 during the upward movement of the piston 103. Also during the replenishment process, if the replenishing chamber 101 is not sufficiently replenished with liquid 2, it is necessary to open 131a to transfer the liquid in the liquid reservoir 3 into the replenishing chamber 101.

When the liquid scale 2 is buckled, the second weighing pipe valve 122a is opened to enable the liquid in the liquid scale 2 to enter the buckling cavity 102, so that the buckling process of the liquid scale 2 is completed; opening 132a to transfer fluid from the fluid replacement chamber 101 to the fluid reservoir 3; in the above-mentioned buckling process, if the liquid in the buckling cavity 102 below is too much, the second liquid storage pipe valve 132a needs to be opened (other valves are closed), so that the piston 103 moves downwards, and the liquid in the buckling cavity 102 of the tank body 1 is transferred into the inner liquid storage tank 3.

In addition, the above-mentioned valves are preferably electrically operated valves. The piston 103 is also connected with a driving mechanism for driving the piston to slide.

According to the liquid weighing device, the liquid compensation device is arranged between the liquid storage tank and the liquid scale, the liquid storage tank and the liquid scale are connected through the first liquid storage pipe, the second weighing pipe and the first weighing pipe, after the weight is converted into the volume according to the liquid density, the compensation and buckling of the liquid scale are realized through the matching of the movement of the piston and the switch of each valve, and the weighing precision is improved, so that the problem of large metering error under a large range in the liquid weighing process in the prior art is solved.

Preferably, in the present embodiment, the piston 103 slides in a sealed manner in the tank 1 in the vertical direction, that is, the expansion and contraction direction of the piston 103 and the axial direction of the tank 1 are both in the vertical direction. Thus, gravity is facilitated to enable the liquid to be measured to flow among the liquid scale 2, the tank body 1 and the liquid storage tank 3.

Preferably, in this embodiment, the tank 1 is cylindrical. Through setting up jar body 1 to cylindrical, the cross-sectional area of the jar body that can be convenient calculates, the liquid volume in the jar body 1 is controlled through the stroke control piston, of course, can be cuboid, square, or other shapes, and piston 103 can change the volume of fluid infusion chamber 101 and knot title chamber 102 through the removal, also can change the volume of fluid infusion chamber 101 and knot title chamber 102 through deformation, as long as can realize. In addition, by enlarging the diameter of the tank body 1, a large-mass complementary buckle scale can be obtained; by reducing the diameter of the tank body 1, accurate compensation buckle weighing can be realized.

Preferably, the liquid weighing apparatus in this embodiment further comprises an execution unit connected to the valve and the piston 103 for controlling the action of the valve and the piston 103. The electric execution unit controls the movement of the piston and the opening and closing of the pipeline valve and is controlled by the output signal of the control unit. Thus, the method is beneficial to the accuracy of executing the action and saves the manpower.

Preferably, the liquid weighing device in this embodiment further includes a control unit, and the control unit is electrically connected with the driving mechanism and the electric valve, and the control unit is used for receiving and processing the compensation weighing instruction, and is used for controlling actions of the driving mechanism and the electric valve. In this way, the control unit can convert the weight into a volume according to the liquid density. Therefore, the weighing compensation method is favorable for accurate calculation in the weighing compensation process.

Preferably, the liquid weighing device in this embodiment includes a man-machine interaction unit, and the man-machine interaction unit is electrically connected with the control unit, and the man-machine interaction unit is used for receiving parameters, displaying information and sending instructions to the control unit. The man-machine interaction unit is communicated with the control unit, sets parameters such as volume, diameter and liquid density of the metering tank, displays complementary buckling weighing information, sends an operation instruction and displays metering alarm prompt information. Thus, the man-machine interaction of the liquid weighing device is improved, and the setting of specific parameters can be performed manually.

Preferably, the liquid weighing device in this embodiment includes an alarm prompting unit for prompting abnormal information. Thus, the safe operation of the liquid weighing device is facilitated. Preferably, in this embodiment, the connection pipes are hoses. Thus, the connection between the tank body 1 and the liquid scale as well as the liquid storage tank is facilitated, and the relative position is convenient to adjust.

Preferably, the valve on the first weighing tube is disposed on the first weighing tube at a location proximate the tank. Thus, the gas in the first weighing tube is reduced, and the weighing precision is improved.

Preferably, the valve on the second weighing tube is disposed on the second weighing tube at a location remote from the canister. Thus, the gas in the second weighing tube is reduced, and the weighing precision is improved.

Referring to fig. 4, fig. 4 is a flow chart illustrating the weighing operation of the liquid weighing apparatus shown in fig. 3. In this embodiment, the initial state of the weighing process is as follows:

a. all valves at the bottom and top are closed; the vent valve 104a is open;

b. the first liquid storage pipe is opened (part of the tank body on the piston is always full of liquid), and the second liquid storage pipe is closed;

c. the piston moves to the bottom of the tank.

The buckling flow is as follows:

a. the operator inputs the button weight on the man-machine device.

b. The actuator closes the vent valve 104a.

c. The bottom second weighing tube valve 122a is opened.

d. The control unit calculates a piston target position.

e. The piston moves upwards to the corresponding position, and the liquid in the liquid scale 2 enters the tank body 1 through the first liquid storage pipe 131 (at the moment, the first liquid storage pipe valve 131a is opened).

f. The bottom second weighing tube valve 122a is closed.

g. The second reservoir valve 132a is opened and the piston is moved to the bottom of the tank, delivering liquid into the reservoir 3 through the second reservoir 132.

h. Returning to the initial state.

Referring to fig. 5, fig. 5 is a flow chart illustrating the liquid weighing apparatus of fig. 3 when the liquid weighing apparatus is replenished. In this embodiment, the compensation process is as follows:

a. the operator inputs the supplemental weight on the man-machine device.

b. The control unit calculates a piston target position.

c. The piston moves upwards to the corresponding position, and part of the liquid in the tank body 1 enters the liquid storage tank through the first liquid storage pipe 131 (the reserved weight is the target weight).

d. The first liquid storage tube 131 is closed.

e. The top first weighing tube valve 121a is opened.

f. The piston moves to the top of the tank, and the liquid in the tank body 1 enters the liquid scale 2.

g. Returning to the initial state.

The liquid weighing apparatus of the present invention has the following advantages: a. is easy to expand and does not affect the original structure. b. According to the density of the liquid, converting the weight into volume, and finally automatically controlling the compensation buckle scale through the movement of the piston; the accurate complementary buckling balance is realized by controlling the radius of the tank body (the smaller the radius is, the longer the stroke is). c. Is compatible with various liquids and has wide application range. d. The balance is not influenced by the balance state, and the balance can be supplemented under the condition of unloading or stable balance. e. The compensation buckle with larger weight can be realized by overlapping or enlarging the tank body for multiple times. f. And a friendly man-machine interaction interface is provided, so that the monitoring of field personnel is facilitated.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. The liquid weighing device is characterized by comprising a tank body (1), a connecting pipe, a liquid scale (2) and a liquid storage tank (3);

a fluid supplementing cavity (101) and a piston (103) for changing the volume of the fluid supplementing cavity are arranged in the tank body (1);

the connecting pipe comprises a first weighing pipe (121) and a first liquid storage pipe (131), the liquid supplementing cavity (101) is communicated with the liquid scale (2) through the first weighing pipe (121), and the liquid supplementing cavity (101) is also communicated with the lower part of the liquid storage tank (3) through the first liquid storage pipe (131);

valves are arranged on the first weighing pipe (121) and the first liquid storage pipe (131);

the inside of the tank body (1) is also provided with a buckling and weighing cavity (102), and the connecting pipe also comprises a second weighing pipe (122) and a second liquid storage pipe (132);

the piston (103) is also used for changing the volume of the buckling cavity (102);

the buckling and weighing cavity (102) is connected with the lower part of the liquid scale (2) through a second weighing pipe (122), and the buckling and weighing cavity (102) is also connected with the liquid storage tank (3) through a second liquid storage pipe (132);

valves are arranged on the second weighing pipe (122) and the second liquid storage pipe (132);

the tank body (1) is also connected with a vent pipe (104), and the vent pipe (104) is connected with the buckling cavity (102); the vent pipe (104) is provided with a valve.

2. A liquid weighing apparatus according to claim 1, wherein said liquid weighing apparatus comprises,

the tank body (1) is a piston cylinder, and the piston (103) is in sliding fit in the piston cylinder.

3. A liquid weighing apparatus according to claim 1 or 2, characterized in that said piston (103) is connected with a drive mechanism for driving said piston (103) to slide.

4. A liquid weighing apparatus according to claim 3 wherein said valve is an electrically operated valve.

5. The liquid weighing apparatus of claim 4, further comprising a control unit electrically connected to said drive mechanism and said electrically operated valve, said control unit for receiving and processing make-up commands and for controlling the actions of said drive mechanism and said electrically operated valve.

6. The liquid weighing apparatus of claim 5, further comprising a human-machine interaction unit electrically connected to said control unit, said human-machine interaction unit configured to receive parameters, display information, and send instructions to said control unit.

7. The liquid weighing device according to claim 6, further comprising an alarm prompting unit arranged in the vicinity of the tank (1), electrically connected to the control unit, for alarm prompting of the tank (1).

8. The liquid weighing apparatus of claim 1 wherein said connecting tube is a hose.