CN117489580A - Plunger pump test platform and test method - Google Patents

Abstract

The invention belongs to the technical field of plunger pump detection, and particularly relates to a plunger pump testing platform and a plunger pump testing method. The plunger pump testing platform is characterized by comprising a plunger pump, a liquid inlet driving piece, a first liquid inlet pipe, a second liquid inlet pipe, a buret and a liquid storage piece; the plunger pump is provided with a liquid inlet and a liquid outlet, the first liquid inlet pipe is connected between the liquid storage piece and the liquid inlet driving piece, the second liquid inlet pipe is connected between the liquid inlet driving piece and the liquid inlet, the liquid outlet is connected with the burette, and the liquid inlet driving piece can drive liquid in the liquid storage piece to enter the burette; the plunger pump is capable of sucking liquid from or discharging liquid to the burette, which is used for monitoring the liquid level. According to the invention, after the plunger pump sucks liquid, liquid is discharged for a plurality of times in a stepping mode, the liquid level change in the buret after each stepping is recorded, and the liquid discharge volume of each time is determined, so that the liquid sucking and discharging precision of the plunger pump is calculated.

Description

Plunger pump test platform and test method

Technical Field

The invention belongs to the technical field of plunger pump detection, and particularly relates to a plunger pump testing platform and a plunger pump testing method.

Background

The plunger pump is widely applied to automatic medical instruments and used for accurately and quantitatively sucking and discharging liquid, so that the plunger pump has extremely high requirements on the liquid sucking and discharging precision.

At present, when the performance of the pumping and draining of the plunger pump is detected, the accuracy of the performance of the plunger pump is judged by directly using related data of a stepping transmission mechanism running on an applied complete machine (such as a saccharification analyzer complete machine), the disassembly and assembly are complex, and other factors possibly influence the judgment of an accuracy result. Or indirectly testing the liquid sucking and discharging precision performance of the plunger pump by testing the mechanical precision of a transmission part of the plunger pump or weighing the liquid discharging weight by using an electronic scale and further converting the liquid sucking and discharging volume, but the indirect method cannot accurately and intuitively indicate the liquid sucking and discharging precision of the plunger pump and is easy to be disturbed by the environment.

Therefore, the existing detection method for the liquid sucking and discharging performance of the plunger pump can not accurately detect the liquid sucking and discharging precision of the plunger pump, and the accuracy of the whole medical instrument can not be guaranteed.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: aiming at the problem that the existing plunger pump suction and discharge performance detection method can not accurately detect the suction and discharge precision of a plunger pump, the plunger pump test platform and the plunger pump test method are provided.

In order to solve the technical problems, in one aspect, an embodiment of the invention provides a plunger pump testing platform, which comprises a plunger pump, a liquid inlet driving piece, a first liquid inlet pipe, a second liquid inlet pipe, a buret and a liquid storage piece;

the plunger pump is provided with a liquid inlet and a liquid outlet, the first liquid inlet pipe is connected between the liquid storage part and the liquid inlet driving part, the second liquid inlet pipe is connected between the liquid inlet driving part and the liquid inlet, the liquid outlet is connected with the burette, and the liquid inlet driving part can drive liquid in the liquid storage part to sequentially pass through the first liquid inlet pipe, the second liquid inlet pipe and the plunger pump and enter the burette;

the plunger pump is capable of sucking or discharging liquid from or into the burette, and the burette is used for monitoring the liquid level of liquid in the plunger pump when the plunger pump sucks or discharges liquid.

Optionally, the plunger pump comprises a mounting seat, a plunger, a screw rod and a stepping motor, wherein a liquid inlet cavity is formed in the mounting seat, and the liquid inlet and the liquid outlet are arranged on the mounting seat and are communicated with the liquid inlet cavity;

the plunger is arranged in the liquid inlet cavity, the stepping motor is connected with the screw rod, the plunger is connected to the screw rod, and the stepping motor drives the plunger to move in the liquid inlet cavity through the screw rod, so that liquid in the burette enters the liquid inlet cavity or is discharged from the liquid inlet cavity.

Optionally, the burette is located above the plunger pump.

Optionally, the plunger pump testing platform further comprises a first control valve, the second liquid inlet pipe comprises a first pipe body and a second pipe body, and the first control valve is arranged between the first pipe body and the second pipe body;

when the first control valve is in an open state, the liquid inlet driving piece drives liquid in the liquid storage piece to enter the burette; when the first control valve is in a closed state, the plunger pump sucks liquid from the burette or discharges liquid into the burette.

Optionally, the plunger pump test platform further comprises a second control valve and a connecting pipe, wherein the connecting pipe is connected between the liquid outlet and the burette, and the second control valve is arranged on the connecting pipe.

Optionally, the plunger pump is provided with a plurality ofly, buret is provided with a plurality ofly, be provided with a plurality of branch pipes on the second feed liquor pipe, every branch pipe connection corresponds the inlet of plunger pump, every the liquid outlet connection of plunger pump corresponds buret.

Optionally, the plunger pump test platform further comprises a test platform and a positioning mechanism, wherein the positioning mechanism is arranged on the test platform and is provided with a limiting hole, and the plunger pump is arranged on the test platform and is positioned in the limiting hole.

Optionally, a liquid collecting tank is placed on the positioning mechanism, and the liquid collecting tank is located below the burette and is used for collecting overflow liquid of the burette.

Optionally, the plunger pump test platform further comprises a power module, a programmable controller and a step driver, wherein the power module is electrically connected with the programmable controller and the step driver, the programmable controller is electrically connected with the step driver, and the step driver is electrically connected with the plunger pump.

In another aspect, an embodiment of the present invention provides a method for testing a plunger pump, which is applied to a plunger pump testing platform as described above, including:

the liquid inlet driving piece is used for pumping liquid in the liquid storage piece and pouring the liquid into the plunger pump and the burette;

the plunger pump executes full-range liquid suction action to suck liquid from the burette;

presetting a target liquid discharge amount, discharging liquid by the plunger pump for a plurality of times according to the target liquid discharge amount in a stepping mode, recording the liquid level of the buret after each liquid discharge, and calculating to obtain an actual liquid discharge amount;

the average value and standard deviation of a plurality of actual drainage amounts are calculated.

According to the plunger pump testing platform provided by the embodiment of the invention, the liquid inlet driving piece is used for enabling the plunger pump and the burette to be filled with liquid, so that all gases are discharged, the plunger pump firstly executes the full-range liquid suction action, so that the liquid in the burette enters the plunger pump, and at the moment, the liquid level in the burette is reduced. After the liquid suction is finished, the plunger pump is used for discharging liquid for a plurality of times in a stepping mode, the liquid level in the buret is gradually increased, the liquid level change in the buret after each stepping is finished is recorded, the liquid level value is recorded, the change value of the liquid level value of two adjacent times is the volume of the plunger pump for discharging liquid each time, and the liquid suction and discharge precision of the plunger pump can be accurately detected according to the recorded change value, so that the accuracy of a medical instrument is ensured.

Drawings

FIG. 1 is a schematic diagram of a plunger pump testing platform according to an embodiment of the present invention;

FIG. 2 is another schematic diagram of a plunger pump testing platform according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a plunger pump according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a plunger pump according to an embodiment of the present invention.

Reference numerals in the specification are as follows:

11. a plunger pump; 111. a liquid inlet; 112. a liquid outlet; 113. a mounting base; 114. a plunger; 115. a screw rod; 116. a stepping motor; 117. a liquid inlet cavity; 118. a sliding chamber; 12. a liquid inlet driving member; 13. a first liquid inlet pipe; 14. a second liquid inlet pipe; 141. a first tube body; 142. a second tube body; 15. a burette; 16. a liquid storage member; 17. a first control valve; 18. a second control valve; 19. a connecting pipe;

2. a test platform; 21. a base; 22. a vertical plate;

3. a positioning mechanism; 31. a limiting hole; 32. a liquid collecting tank;

4. a power module;

5. a programmable controller;

6. a step driver.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that terms such as "front", "rear", "vertical", "horizontal", "upper", "lower", "inner", "outer", and the like are used solely with reference to the drawings in which the present invention is used, and are not intended to be limiting in any way.

In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the term "connected" should be interpreted broadly, and for example, it may be a fixed connection, a removable connection, or an integral connection; 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 can be understood by those of ordinary skill in the art according to the specific circumstances.

As shown in fig. 1 to 4, the plunger pump testing platform according to an embodiment of the present invention includes the plunger pump 11, a liquid inlet driving member 12, a first liquid inlet pipe 13, a second liquid inlet pipe 14, a burette 15 and a liquid storage member 16. The plunger pump 11 is provided with a liquid inlet 111 and a liquid outlet 112, the first liquid inlet pipe 13 is connected between the liquid storage piece 16 and the liquid inlet driving piece 12, the second liquid inlet pipe 14 is connected between the liquid inlet driving piece 12 and the liquid inlet 111, the liquid outlet 112 is connected with the burette 15, and under the driving action of the liquid inlet driving piece 12, liquid in the liquid storage piece 16 sequentially passes through the first liquid inlet pipe 13, the second liquid inlet pipe 14 and the plunger pump 11 and enters the burette 15. Specifically, the liquid inlet driving member 12 can pump the liquid in the liquid storage member 16 through the first liquid inlet pipe 13, flows to the plunger pump 11 through the second liquid inlet pipe 14, enters from the liquid inlet 111 of the plunger pump 11, flows out from the liquid outlet 112 of the plunger pump 11, and finally enters into the burette 15, so that the burette 15 and the plunger pump 11 are filled with the liquid, bubbles in the plunger pump 11 and the burette 15 are discharged, the liquid sucking and discharging amount of the plunger pump 11 is prevented from being influenced, and the accuracy of the measurement result when the plunger pump 11 sucks and discharges liquid is ensured.

The plunger pump 11 can absorb liquid from the buret 15 or drain liquid to the buret 15, the buret 15 is provided with scales for monitoring the liquid level of the liquid in the plunger pump 11 during liquid absorption or liquid draining, and the liquid volume of liquid absorption and liquid draining can be measured according to the liquid level change in the buret 15, so that the liquid absorption and liquid draining precision can be judged more intuitively and efficiently, and the environment interference is avoided.

According to the plunger pump test platform provided by the embodiment of the invention, the liquid inlet driving piece 12 is used for enabling the plunger pump 11 and the burette 15 to be filled with liquid, so that all gases are discharged, the plunger pump 11 firstly executes full-range liquid suction action, so that the liquid in the burette 15 enters the plunger pump 11, and at the moment, the liquid level in the burette 15 is reduced. After the liquid suction is finished, the plunger pump 11 is divided into a plurality of times for liquid discharge according to a stepping mode, the liquid level in the buret 15 is gradually increased, the liquid level change in the buret 15 after each stepping is recorded, the liquid level value is recorded, the change value of the liquid level value of two adjacent times is the volume of the plunger pump 11 for each liquid discharge, the liquid suction and discharge precision of the plunger pump 11 is accurately detected according to the recorded change value, and the sample feeding accuracy of the plunger pump 11 is ensured, so that the accuracy of a medical instrument is ensured.

Through adopting the plunger pump test platform of this embodiment, through buret 15 can accurately detect the liquid sucking and discharging and change, compare more efficient and directly perceived in traditional weighing measurement method, and this test platform 2 simple structure is high-efficient, and the dismouting process is simple, is difficult for receiving external environment interference in the testing process, can not influence the judgement of result.

In an embodiment of the present application, the liquid feeding driving member 12 is a peristaltic pump, which has better repetition accuracy and stability accuracy, and uses the peristaltic pump to fill liquid, so that the efficiency is higher and the noise is low. The peristaltic pump is of a conventional structure, and will not be described in detail here.

Preferably, the first liquid inlet pipe 13 and the second liquid inlet pipe 14 are hoses.

In one embodiment of the present application, as shown in fig. 1, the liquid storage member 16 is a liquid storage container, and the specific structure and shape of the liquid storage member 16 is not limited, and the test liquid stored in the liquid storage member 16 is not limited. In this embodiment, the liquid storage member 16 is a beaker, the peristaltic pump can pump liquid from the beaker through the first liquid inlet pipe 13, and the liquid is conveyed to the plunger pump 11 and the burette 15 through the second liquid inlet pipe 14, so as to discharge the gas in the plunger pump 11 and the burette 15.

In an embodiment of the present application, as shown in fig. 2 and 3, the plunger pump 11 includes a mounting seat 113, a plunger 114, a screw rod 115 and a stepper motor 116, a liquid inlet 117 is disposed in the mounting seat 113, the liquid inlet 111 and the liquid outlet 112 are disposed on the mounting seat 113 and are communicated with the liquid inlet 117, the liquid inlet driving member 12 conveys liquid through the second liquid inlet pipe 14, the liquid can enter the liquid inlet 117 through the liquid inlet 111, and after filling the liquid inlet 117, the liquid flows out from the liquid outlet 112 and enters the burette 15, thereby realizing the filling of the plunger pump 11 and the burette 15, so that no bubbles exist in the plunger pump 11 and the burette 15.

The plunger 114 is disposed in the liquid inlet cavity 117, the stepper motor 116 is connected with the screw rod 115, the plunger 114 is in threaded connection with the screw rod 115, the stepper motor 116 can drive the screw rod 115 to rotate, and then the plunger 114 is driven to move in the liquid inlet cavity 117 by the screw rod 115, so that liquid in the burette 15 enters the liquid inlet cavity 117 or liquid is discharged from the liquid inlet cavity 117.

In one embodiment of the present application, the plunger pump 11 is driven by the stepper motor 116, and the stepper drive system is a system that converts electrical pulses into angular displacements. The stepping motor 116 rotates by a corresponding angle according to a set direction, and the angular displacement can be controlled by controlling the number of pulses, so that the purpose of accurate positioning is achieved, and the liquid can be accurately and quantitatively sucked and discharged. Meanwhile, the rotating speed and the acceleration of the motor can be controlled by controlling the pulse frequency, so that the speed regulation purpose is achieved.

As shown in fig. 2 and 3, the inside of the mounting seat 113 further has a sliding cavity 118, the liquid inlet cavity 117 is located above the plunger 114, the sliding cavity 118 is located below the plunger 114, and the plunger 114 is disposed in the liquid inlet cavity 117 and the sliding cavity 118. The plunger pump 11 uses the stepper motor 116 as power, and makes the stepper motor 116 rotate by sending out a control pulse, and the driving end of the stepper motor 116 drives the screw rod 115 to change the rotation motion into linear motion, and changes the rotation direction of the driving end of the stepper motor 116 by controlling the direction of a pulse signal, so as to correspondingly change the rotation direction of the screw rod 115, further make the plunger 114 connected to the screw rod 115 reciprocate in the liquid inlet cavity 117 and the sliding cavity 118, and when the plunger 114 reciprocates in the liquid inlet cavity 117, the volume of the liquid inlet cavity 117 can be changed, and then the liquid inlet and the liquid outlet are carried out through the liquid outlet 112 of the mounting seat 113, so that the sample adding process is realized.

Specifically, when the liquid feeding driving member 12 fills the plunger pump 11 and the burette 15 with liquid, the plunger 114 is located at the uppermost part of the liquid feeding chamber 117, at this time, the volume of the liquid feeding chamber 117 is minimum, the volume of the sliding chamber 118 is maximum, and when the plunger pump 11 performs a full-scale liquid sucking action, the stepper motor 116 drives the plunger 114 to move downwards, so that the volume of the liquid feeding chamber 117 is increased and the volume of the sliding chamber 118 is reduced, and then the liquid in the burette 15 enters the liquid feeding chamber 117 through the liquid outlet 112, and the liquid sucking action is completed when the liquid feeding chamber 117 is filled. When the liquid is discharged, the stepping motor 116 drives the plunger 114 to move upwards, so that the liquid in the liquid inlet cavity 117 is pushed out by the plunger 114 and enters the burette 15 through the liquid outlet 112, and the liquid discharging action is realized.

In an embodiment of the present application, as shown in fig. 2 and 3, the liquid inlet 111 is located at a side surface of the plunger pump 11, the liquid outlet 112 is located at a top of the plunger pump 11, and liquid enters from the liquid inlet 111 and flows out from the liquid outlet 112. The burette 15 is located above the plunger pump 11 to facilitate the discharge of gas from the burette 15 when liquid is poured through the liquid inlet drive member 12, and to facilitate the drop of liquid from the burette 15 into the plunger pump 11 when the volume of the first chamber is increased by the displacement of the plunger 114 by the stepper motor 116 of the plunger pump 11.

Wherein, the burette 15 is installed upside down, i.e. the small scale on the burette 15 is down and the large scale is up, so that the reading of the liquid discharge amount is convenient when the liquid level in the burette 15 is raised.

In some alternative embodiments, the flow direction of the liquid in the plunger pump 11 is not limited, and the liquid outlet 112 at the top of the plunger pump 11 may be used as a liquid inlet, and the liquid inlet 111 at the side of the plunger pump 11 may be used as a liquid outlet. The sample loading process of the plunger pump 11 is not affected.

In an embodiment of the present application, as shown in fig. 1, the plunger pump test platform further includes a first control valve 17, the second liquid inlet pipe 14 includes a first pipe body 141 and a second pipe body 142, the first pipe body 141 is connected between the liquid inlet driving member 12 and the first control valve 17, the second pipe body 142 is connected between the first control valve 17 and the liquid inlet 111 of the plunger pump 11, the first control valve 17 is disposed between the first pipe body 141 and the second pipe body 142, and the connection and disconnection between the first pipe body 141 and the second pipe body 142 can be controlled through the first control valve 17, that is, the on/off of the liquid in the second liquid inlet pipe 14 is controlled.

When the liquid is poured into the plunger pump 11 and the burette 15, the first control valve 17 is in an open state, and the liquid inlet driving member 12 draws the liquid from the liquid storage member 16 through the first liquid inlet pipe 13, and then passes through the first pipe body 141, the second pipe body 142, the liquid inlet 111 and the liquid outlet 112 in sequence, and then enters the burette 15. After filling, the first control valve 17 is closed, so that the first control valve 17 is in a closed state, the plunger pump 11 sucks liquid from the burette 15 or discharges liquid to the burette 15, the situation of sucking and discharging liquid can be accurately reflected, and meanwhile, when the plunger pump 11 performs sucking or discharging liquid action, liquid in the second liquid inlet pipe 14 enters the plunger pump 11 or discharges liquid to the second liquid inlet pipe 14 to influence detection precision.

Preferably, the first control valve 17 is a two-way valve.

In an embodiment of the present application, as shown in fig. 1, the plunger pump testing platform further includes a second control valve 18 and a connecting pipe 19, the connecting pipe 19 is connected between the liquid outlet 112 and the burette 15, the second control valve 18 is disposed on the connecting pipe 19, and the on-off of the liquid in the connecting pipe 19 can be controlled by the second control valve 18.

When the liquid is poured, the second control valve 18 is in an open state, the liquid inlet driving member 12 draws the liquid from the liquid storage member 16 through the first liquid inlet pipe 13, and then passes through the first pipe body 141, the second pipe body 142, the liquid inlet 111, the liquid outlet 112 and the connecting pipe 19 in sequence, and then enters the burette 15. When the plunger pump 11 sucks and discharges liquid, the second control valve 18 is in an open state, the liquid in the burette 15 enters the plunger pump 11 through the connecting pipe 19 and the liquid outlet 112 to realize the liquid inlet action of the plunger pump 11, and the plunger 114 in the plunger pump 11 pushes the liquid to flow out from the liquid outlet 112, and enters the plunger pump 11 after passing through the connecting pipe 19 to realize the liquid discharge action of the plunger pump 11.

Preferably, the second control valve 18 is a two-way valve, and the connecting pipe 19 is a hose.

In an embodiment of the present application, as shown in fig. 1, the plunger pump 11 is provided with a plurality of plunger pumps, the burette 15 is provided with a plurality of burette pipes, and the second liquid inlet pipe 14 is provided with a plurality of branch pipes, and each branch pipe is connected with the corresponding liquid inlet 111 of the plunger pump 11, so that the liquid inlet driving member 12 can simultaneously pour liquid into a plurality of plunger pumps 11 and a plurality of burette pipes 15 through a plurality of branch pipes. Each liquid outlet 112 of the plunger pump 11 is connected to the corresponding burette 15, the plunger pump 11 can absorb liquid and drain liquid from the corresponding burette 15, and a plurality of liquid absorption and drainage precision tests of the plunger pumps 11 can be simultaneously performed, so that the test is convenient and fast, and the test efficiency is high.

Correspondingly, the number of the connecting pipes 19 is consistent with the number of the measuring pipes 15, and each connecting pipe 19 is connected between the corresponding measuring pipe 15 and the liquid outlet 112.

In a specific embodiment, two plunger pumps 11 are provided, and two measuring tubes 15 are provided, so that two plunger pumps 11 can be tested at the same time.

In an embodiment of the present application, as shown in fig. 1 and 2, the plunger pump test platform further includes a test platform 2 and a positioning mechanism 3, the positioning mechanism 3 is disposed on the test platform 2, a limiting hole 31 is disposed on the positioning mechanism 3, and the plunger pump 11 is mounted on the test platform 2 and is located in the limiting hole 31. The number of the limiting holes 31 is the same as that of the plunger pumps 11, and each limiting hole 31 is provided with the corresponding plunger pump 11, so that the plunger pump 11 is clamped and positioned on the test platform 2.

The test platform 2 comprises a base 21 and a vertical plate 22, the positioning mechanism 3 is arranged on the base 21 and is abutted against the vertical plate 22, and the liquid inlet driving piece 12, the first control valve 17, the second control valve 18 and the buret 15 are arranged on the vertical plate 22, so that the buret 15 and the connecting pipe 19 are positioned above the plunger pump 11, and exhaust is facilitated. The number of the measuring tubes 15 and the number of the plunger pumps 11 need to be determined according to the size of the vertical plate 22, so that the test platform 2 can be fully utilized, and the test efficiency is improved.

In an embodiment of the present application, as shown in fig. 1, the positioning mechanism 3 is provided with a liquid collecting tank 32, the liquid collecting tank 32 is located below the burette 15, when the burette 15 is filled with liquid, the burette 15 needs to be filled with liquid to ensure that all gases are discharged, and the liquid overflowing from the burette 15 can be collected by placing the liquid collecting tank 32, so that overflow liquid is prevented from being accumulated on the test platform 2.

Wherein, the liquid collecting groove 32 can collect the overflowed liquid of at least two burettes 15 at the same time, and the utilization rate of the liquid collecting groove 32 can be improved.

In an embodiment of the present application, as shown in fig. 2, the plunger pump test platform further includes a host computer system, a driving control module and a detection module, where the driving control module includes a power module 4, a programmable controller 5 and a step driver 6, the power module 4, the programmable controller 5 and the step driver 6 are disposed on the test platform 2, the power module 4 is electrically connected with the programmable controller 5 and the step driver 6, the programmable controller 5 is electrically connected with the step driver 6, and the step driver 6 is electrically connected with the plunger pump 11.

The detection module comprises the plunger pump 11, the first control valve 17, the second control valve 18, the burette 15 and the liquid inlet driving element 12, and the liquid sucking and discharging precision of the plunger pump 11 is detected through the detection module.

After the upper computer system is programmed according to the requirement, the upper computer system transmits a command to the programmable controller 5, the programmable controller 5 (PLC) converts the command into a corresponding time sequence signal according to the command and transmits the corresponding time sequence signal to the step driver 6, so that the step motor 116 of the plunger pump 11 moves according to the received pulse and direction signals, the moving speed of the plunger 114 is changed through the frequency of the pulse signal, the moving direction of the step motor 116 is changed through the direction of the pulse signal, and finally the liquid sucking and discharging performance of the plunger pump 11 to be tested is tested by using the buret 15, so that the liquid sucking and discharging precision of the plunger pump 11 is effectively checked and ensured.

After the first liquid inlet pipe 13, the second liquid inlet pipe 14 and the connecting pipe 19 are connected, the programmable controller 5 controls the first control valve 17 to be in an open state, the programmable controller 5 controls the liquid inlet driving piece 12 to operate through the step driver 6, liquid is sucked from the liquid storage piece 16 through the first liquid inlet pipe 13 and poured into the plunger pumps 11 and the burette 15, and surplus liquid flows out of the burette 15 and enters the liquid collecting tank 32. After the filling is completed, the programmable controller 5 controls the first control valve 17 to be closed. After the step driver 6 receives the pulse signal emitted by the programmable controller 5, the step motor 116 of the plunger pump 11 rotates by a corresponding angle according to a set direction, performs a full-scale liquid suction action, and stops the liquid suction action of the plunger pump 11 after receiving a feedback signal that the plunger pump 11 has sucked liquid. Then the upper computer system sends out a signal to make the plunger pump 11 discharge the liquid in a stepping mode, wherein the stepping mode refers to that the liquid amount sucked in the whole measuring range is divided into a plurality of stepping actions to perform liquid discharge, and the liquid discharge precision is determined by calculating a plurality of liquid discharge amounts.

Preferably, the number of step drivers 6 is identical to the number of plunger pumps 11, and each step driver 6 is electrically connected to the corresponding plunger pump 11.

On the other hand, the embodiment of the invention provides a testing method of the plunger pump, which is applied to the testing platform of the plunger pump in the embodiment, and comprises the following steps:

the liquid in the liquid storage member 16 is pumped by the liquid inlet driving member 12, and then sequentially passes through the first pipe body 141, the second pipe body 142, the liquid inlet 111 and the liquid outlet 112, and then enters the burette 15. Liquid is poured into the plunger pump 11 and the burette 15, so that the gas in the plunger pump 11 and the burette 15 can be discharged, and no bubbles are ensured in the liquid inlet cavities 117 of the burette 15 and the plunger pump 11.

The plunger pump 11 performs a full-scale liquid suction operation, performs liquid suction from the measuring tube 15, records the liquid level of the measuring tube 15, and can obtain the liquid suction amount of the full-scale liquid suction, and can determine the liquid suction accuracy of the plunger pump 11 by comparing the liquid suction amount with the working volume of the plunger pump 11.

The method comprises the steps that a target liquid discharge amount is preset, the liquid suction amount of a full range is set according to the stepping number, the plunger pump 11 discharges liquid for a plurality of times according to the target liquid discharge amount in a stepping mode, all liquid absorbed by the full range can be discharged after the liquid discharge is performed for a plurality of times, the liquid level of the buret 15 after each liquid discharge is recorded, and the actual liquid discharge amount can be calculated through scales on the buret 15.

The average value of the actual liquid discharge amounts is calculated, and the liquid discharge accuracy of the plunger pump 11 can be obtained by the ratio of the average value to the target liquid discharge amount, and the closer the ratio to 1, the higher the liquid discharge accuracy of the plunger pump 11. Then, the standard deviation of the actual liquid discharge amounts, that is, the square root of the arithmetic mean from the square of the mean deviation, is calculated, and the fluctuation of the stepped liquid discharge volume can be reflected by the standard deviation.

According to the method for testing the plunger pump provided by the embodiment of the invention, the liquid inlet driving piece 12 is used for enabling the plunger pump 11 and the burette 15 to be filled with liquid, so that all gases are discharged, and after the plunger pump 11 executes the full-range liquid suction action, the liquid in the burette 15 is enabled to enter the plunger pump 11. After the liquid suction is finished, the plunger pump 11 is divided into a plurality of times for liquid discharge according to a stepping mode, the liquid level in the buret 15 is gradually increased until all the liquid is discharged, the liquid level change in the buret 15 after each stepping is finished is recorded, the volume of each liquid discharge of the plunger pump 11 is obtained through calculation, and finally the liquid suction precision and the repeated precision of the plunger pump 11 are obtained through calculation of the finishing data, so that the sample adding precision of the plunger pump 11 is ensured, and the precision of a medical instrument is ensured.

In some alternative embodiments, the accuracy of the liquid discharge can also be determined by making a discrete plot of the actual liquid discharge.

In an embodiment of the present application, the method for testing the plunger pump further includes, after the upper computer system is programmed as required, transmitting a command to the programmable controller 5 by the upper computer system, converting the command into a corresponding time sequence signal by the programmable controller 5 (PLC), and transmitting the corresponding time sequence signal to the step driver 6, so that the step motor 116 of the plunger pump 11 moves according to the received pulse and direction signal, changing the moving speed of the plunger 114 through the frequency of the pulse signal, changing the moving direction of the step motor 116 through controlling the direction of the pulse signal, and finally testing the liquid sucking and discharging performance of the plunger pump 11 to be tested by using the burette 15, thereby effectively checking and ensuring the liquid sucking and discharging precision of the plunger pump 11.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. The plunger pump testing platform is characterized by comprising a plunger pump, a liquid inlet driving piece, a first liquid inlet pipe, a second liquid inlet pipe, a buret and a liquid storage piece;

the plunger pump is provided with a liquid inlet and a liquid outlet, the first liquid inlet pipe is connected between the liquid storage part and the liquid inlet driving part, the second liquid inlet pipe is connected between the liquid inlet driving part and the liquid inlet, the liquid outlet is connected with the burette, and the liquid inlet driving part can drive liquid in the liquid storage part to sequentially pass through the first liquid inlet pipe, the second liquid inlet pipe and the plunger pump and enter the burette;

the plunger pump is capable of sucking or discharging liquid from or into the burette, and the burette is used for monitoring the liquid level of liquid in the plunger pump when the plunger pump sucks or discharges liquid.

2. The plunger pump testing platform of claim 1, wherein the plunger pump comprises a mounting seat, a plunger, a screw rod and a stepping motor, wherein a liquid inlet cavity is formed in the mounting seat, and the liquid inlet and the liquid outlet are arranged on the mounting seat and are communicated with the liquid inlet cavity;

the plunger is arranged in the liquid inlet cavity, the stepping motor is connected with the screw rod, the plunger is connected to the screw rod, and the stepping motor drives the plunger to move in the liquid inlet cavity through the screw rod, so that liquid in the burette enters the liquid inlet cavity or is discharged from the liquid inlet cavity.

3. The plunger pump testing platform of claim 2, wherein the burette is located above the plunger pump.

4. The plunger pump testing platform of claim 1, further comprising a first control valve, the second feed tube comprising a first tube body and a second tube body, the first control valve disposed between the first tube body and the second tube body;

when the first control valve is in an open state, the liquid inlet driving piece drives liquid in the liquid storage piece to enter the burette; when the first control valve is in a closed state, the plunger pump sucks liquid from the burette or discharges liquid into the burette.

5. The plunger pump testing platform of claim 1, further comprising a second control valve and a connecting tube, the connecting tube connected between the liquid outlet and the burette, the second control valve disposed on the connecting tube.

6. The plunger pump testing platform of claim 1, wherein a plurality of plunger pumps are provided, a plurality of burette pipes are provided, a plurality of branch pipes are provided on the second liquid inlet pipe, each branch pipe is connected with the liquid inlet of the corresponding plunger pump, and the liquid outlet of each plunger pump is connected with the corresponding burette pipe.

7. The plunger pump testing platform of claim 1, further comprising a testing platform and a positioning mechanism, wherein the positioning mechanism is disposed on the testing platform, wherein the positioning mechanism is provided with a limiting hole, and wherein the plunger pump is mounted on the testing platform and is disposed in the limiting hole.

8. The plunger pump testing platform of claim 7, wherein a sump is disposed on the positioning mechanism, the sump being located below the burette for collecting overflow liquid from the burette.

9. The plunger pump testing platform of claim 1, further comprising a power module, a programmable controller, and a stepper driver, wherein the power module is electrically connected to the programmable controller and the stepper driver, wherein the programmable controller is electrically connected to the stepper driver, and wherein the stepper driver is electrically connected to the plunger pump.

10. A method for testing a plunger pump, applied to the plunger pump test platform according to any one of claims 1 to 9, comprising:

the liquid inlet driving piece is used for pumping liquid in the liquid storage piece and pouring the liquid into the plunger pump and the burette;

the plunger pump executes full-range liquid suction action to suck liquid from the burette;

presetting a target liquid discharge amount, discharging liquid by the plunger pump for a plurality of times according to the target liquid discharge amount in a stepping mode, recording the liquid level of the buret after each liquid discharge, and calculating to obtain an actual liquid discharge amount;

the average value and standard deviation of a plurality of actual drainage amounts are calculated.