Method for testing durability of filling pump

Abstract

The invention relates to the technical field of filling pump testing, and provides a filling pump durability testing method which comprises the following steps: determining an initial valve port opening k1 of a backflow pressure control valve in a durability test based on the flow Q1 of an output pipeline and the backflow flow Q2 of a hopper when a filling pump runs; for example, the initial valve opening degree k1 of the backflow pressure control valve is adjusted to be in a proper state, so that the backflow flow Q2 of the hopper is equal to the flow Q1 of the output pipeline when the filling pump operates. Through the filling pump durability test method, the overflow phenomenon of the filling pump hopper in the durability test process can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of filling pump testing, and particularly to a durability testing method for a filling pump. Background Art

[0002] A filling pump is a conveying device based on the principle of hydraulic machinery. When the pump pressure passes through the pump body, a vacuum or negative pressure is formed between the pump bodies, causing the suction medium to fill the pump cavity, and then through the conveying function of the pump, the medium is conveyed from one place to another.

[0003] The industrial test of the filling pump is mainly a pressure loading test, that is, a durability test, which is used to monitor various physical indicators of the filling pump at different pressure levels. In the prior art, during the durability test of the filling pump, a hopper overflow phenomenon is likely to occur. Summary of the Invention

[0004] In view of the above technical problems, the present invention provides a durability testing method for a filling pump.

[0005] A durability testing method for a filling pump provided by the present invention includes the following steps: based on the flow rate Q of the output pipeline during the operation of the filling pump 1 and the hopper return flow rate Q 2 , determine the initial valve opening k of the return pressure control valve in the durability test 1 .

[0006] According to the durability testing method for a filling pump provided by the present invention, based on the flow rate Q of the output pipeline during the operation of the filling pump 1 and the hopper return flow rate Q 2 , the step of determining the initial valve opening k of the return pressure control valve in the durability test specifically includes: recording the flow rate Q of the output pipeline during the operation of the filling pump 1 ; continuously adjusting the valve opening of the return pressure control valve until the hopper return flow rate Q 1 is equal to the flow rate Q of the output pipeline 2 ; determine the valve opening of the return pressure control valve at this time as the initial valve opening k 1 . 1 .

[0007] According to the durability testing method for a filling pump provided by the present invention, after the step of determining the valve opening of the return pressure control valve at this time as the initial valve opening k 1 , it further includes: adjusting the valve opening of the return pressure control valve to the initial valve opening k 1 .

[0008] According to a durability test method for a filling pump provided by the present invention, adjusting the valve opening of the return pressure control valve to the initial valve opening k 1 After the step, it further includes: adjusting the valve opening of the test pressure control valve until the pressure value of the output pipeline reaches the specified test pressure value; performing a durability test at the specified pressure value until the durability test time reaches the specified test time.

[0009] According to a durability test method for a filling pump provided by the present invention, after the step of adjusting the valve opening of the return pressure control valve to the initial valve opening k 1 Before the step of adjusting the valve opening of the test pressure control valve until the pressure value of the output pipeline reaches the specified test pressure value, it further includes: recording the liquid level value L in the filling pump hopper at this time c ; in the step of performing a durability test at the specified pressure value until the durability test time reaches the specified test time, based on the relationship between the liquid level value L c And the target liquid level value, the PID regulator automatically adjusts the valve opening of the return pressure control valve.

[0010] According to a durability test method for a filling pump provided by the present invention, the step of the PID regulator automatically adjusting the valve opening of the return pressure control valve based on the relationship between the liquid level value L c And the target liquid level range specifically includes: keeping the valve opening of the return pressure control valve unchanged when the liquid level value is within the target liquid level range; increasing or decreasing the valve opening of the return pressure control valve when the liquid level value is outside the target liquid level range.

[0011] According to a durability test method for a filling pump provided by the present invention, it further includes: after the filling pump runs, first start the cooling circulation pump to circulate and cool the liquid flow in the liquid tank; then start the centrifugal pump to pump the liquid flow in the liquid tank into the filling pump hopper.

[0012] According to a durability test method for a filling pump provided by the present invention, the method of adjusting the valve opening of the return pressure control valve includes remotely controlling the electric actuator of the return pressure control valve; the method of adjusting the valve opening of the test pressure control valve includes remotely controlling the electric actuator of the test pressure control valve.

[0013] According to a durability test method for a filling pump provided by the present invention, based on the flow rate Q of the output pipeline during the operation of the filling pump 1 And the hopper return flow rate Q 2 , determining the initial valve opening k of the return pressure control valve in the durability test 1Before the steps of , it further includes: starting the plunger oil pump motor to drive the plunger oil pump to operate.

[0014] According to a filling pump durability test method provided by the present invention, after the step of starting the plunger oil pump motor to drive the plunger oil pump to operate, it further includes: adjusting the oil-based reversing valve to drive the water-based hydraulic cylinder to move forward or backward by the oil-based hydraulic cylinder.

[0015] In the filling pump durability test method provided by the present invention, based on the flow rate Q of the output pipeline during the operation of the filling pump 1 and the hopper return flow rate Q 2 , determine the initial valve opening k of the return pressure control valve in the durability test 1 . For example, by adjusting the initial valve opening k of the return pressure control valve 1 to a suitable state, so that the hopper return flow rate Q during the operation of the filling pump 2 is equal to the flow rate Q of the output pipeline 1 . Through the above filling pump durability test method, the occurrence of the phenomenon of the filling pump hopper overflow during the durability test can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is the system schematic diagram of the filling pump test system involved in the filling pump durability test method provided by the present invention.

[0018] Figure 2 is the structural schematic diagram of the test pressure control valve or the return pressure control valve involved in the filling pump durability test method provided by the present invention.

[0019] Figure 3 is the flowchart of the preliminary test in the filling pump durability test method provided by the present invention.

[0020] Figure 4 is the flowchart of the durability test in the filling pump durability test method provided by the present invention.

[0021] Figure 5 is the flowchart of the liquid level adjustment of the PID regulator in the filling pump durability test method provided by the present invention.

[0022] Reference numerals: 100, filling pump; 110, fuel tank; 120, plunger oil pump; 130, oil-based overflow valve; 140, oil-based directional valve; 150, oil-based hydraulic cylinder; 160, water-based hydraulic cylinder; 170, water-based swing valve; 180, hopper; 200, test pressure control valve; 210, electric actuator; 220, upper valve body; 230, lower valve body; 240, valve sleeve; 250, valve core; 260, output rod; 300, remote controller; 400, liquid tank; 510, return pressure control valve; 520, centrifugal pump; 610, first flow detection device; 620, second flow detection device; 630, liquid level detection device; 640, first pressure detection device; 650, second pressure detection device; 710, cooling tower; 720, cooling circulation pump; 800, raised wall. Detailed implementation manners

[0023] The following further describes in detail the implementation manners of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0024] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0026] In the embodiments of the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0027] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0028] The following is combined with Figures 1 to 5 A durability test method for a filling pump provided by an embodiment of the present invention will be described. It should be understood that the following is only a schematic embodiment of the present invention and does not constitute any special limitation to the present invention.

[0029] An embodiment of the present invention provides a durability test method for a filling pump, including the following steps: based on the flow rate Q1 of the output pipeline and the hopper return flow rate Q2 when the filling pump 100 is running, determine the initial valve opening k1 of the return pressure control valve 510 in the durability test. For example, by adjusting the initial valve opening k1 of the return pressure control valve 510 to a suitable state, the hopper return flow rate Q2 is made equal to the flow rate Q1 of the output pipeline when the filling pump 100 is running. Through the above-mentioned durability test method for the filling pump, the occurrence of the overflow phenomenon of the filling pump hopper 180 during the durability test can be reduced.

[0030] In one embodiment of the present invention, the step of determining the initial valve opening k1 of the return pressure control valve 510 in the durability test based on the flow rate Q1 of the output pipeline and the hopper return flow rate Q2 when the filling pump 100 is operating specifically includes: Record the flow rate Q1 of the output pipeline when the filling pump 100 is operating; Continuously adjust the valve opening of the return pressure control valve 510 until the hopper return flow rate Q2 is equal to the flow rate Q1 of the output pipeline; Determine that the valve opening of the return pressure control valve 510 at this time is the initial valve opening k1.

[0031] In one embodiment of the present invention, after the step of determining that the valve opening of the return pressure control valve 510 at this time is the initial valve opening k1, it further includes: Adjust the valve opening of the return pressure control valve 510 to the initial valve opening k1.

[0032] That is to say, before the durability test, a preliminary test needs to be carried out. The purpose of the preliminary test is to determine the valve opening of the return pressure control valve 510 under the condition that the hopper 180 does not overflow, so as to provide an initial debugging basis for the subsequent durability test of the filling pump 100.

[0033] This test method is based on the filling pump 100 test system. Specifically, for example, as Figure 1 shown, the filling pump 100 test system includes a filling pump 100, a test pressure control valve 200, a return pressure control valve 510, a centrifugal pump 520, a first flow rate detection device 610, a second flow rate detection device 620, and a liquid tank 400. The filling pump 100 includes a discharge port and a hopper 180 feed port. The liquid tank 400 is arranged between the discharge port of the filling pump 100 and the hopper 180 feed port. The test pressure control valve 200 and the first flow rate detection device 610 are arranged between the discharge port of the filling pump 100 and the liquid tank 400, and the return pressure control valve 510, the centrifugal pump 520, and the second flow rate detection device 620 are arranged between the liquid tank 400 and the hopper 180 feed port of the filling pump 100. During the test, the liquid output from the discharge port of the filling pump 100 first enters the liquid tank 400, and then the liquid in the liquid tank 400 enters the hopper 180 feed port. A remote controller 300 can be set. The remote controller 300 is connected to the first flow rate detection device 610, the second flow rate detection device 620, the test pressure control valve 200, and the return pressure control valve 510. The remote controller 300 can remotely adjust the valve opening of the test pressure control valve 200 and adjust the valve opening of the return pressure control valve 510 based on the detection results of the first flow rate detection device and the second flow rate detection device 620.

[0034] In this filling pump durability test method, when the filling pump 100 is running and the medium flows through the first flow detection device 610, the first flow detection device 610 transmits the detection result to the remote controller 300. The remote controller 300 records the flow value Q1 of the first flow detection device 610 at this time and turns on the centrifugal pump 520, so that the centrifugal pump 520 extracts the medium from the liquid tank 400. The medium enters the hopper 180 after flowing through the second flow detection device 620 and the return pressure control valve 510. During this process, the remote controller 300 continuously adjusts the valve opening of the return pressure control valve 510 until the flow value of the second flow detection device 620 is equal to Q1, and records the valve opening of the return pressure control valve 510 at this time as k1, so as to provide the initial setting value of the return pressure control valve 510 for subsequent durability tests, ensure that the liquid ejected from the discharge port of the filling pump 100 is basically equal to the liquid recovered at the liquid inlet of the hopper 180, and prevent overflow.

[0035] In an embodiment of the present invention, the method for adjusting the valve opening of the return pressure control valve 510 includes remotely controlling the electric actuator 210 of the return pressure control valve 510; the method for adjusting the valve opening of the test pressure control valve 200 includes remotely controlling the electric actuator 210 of the test pressure control valve 200.

[0036] For example, as Figure 2 shown, both the return pressure control valve 510 and the test pressure control valve 200 are electric sleeve plunger valves. The electric sleeve plunger valve includes an electric actuator 210, an upper valve body 220, a lower valve body 230, a valve sleeve 240, a valve core 250 and a force output rod 260. Among them, the upper valve body 220 is butt-connected to the lower valve body 230. The lower valve body 230 is provided with a cavity, and a low-pressure port and a high-pressure port are opened thereon. The valve sleeve 240 is installed in the cavity of the lower valve body 230, and the valve core 250 is sleeved into the valve sleeve 240. The force output rod 260 passes through the upper valve body 220 and is connected to the valve core 250. The electric actuator 210 is connected to the force output rod 260. During the working process, the electric actuator 210 can drive the force output rod 260 to move, and the force output rod 260 drives the valve core 250 to move, thereby changing the valve opening between the valve core 250 and the high-pressure port, and further adjusting the pressure of the electric sleeve plunger valve. For example, the electric actuator 210 includes a stepping motor, a reducer and a lead screw. The remote controller 300 is a host computer. The host computer controls the PLC to send a pulse signal, and the pulse signal controls the stepping motor to rotate. The output torque is increased by the reducer, and the increased torque is a rotational motion, and then it is converted into a linear motion through the lead screw. The lead screw is mechanically connected to the valve core 250 through the force output rod 260, and then drives the valve core 250 to move up and down to steplessly adjust the valve opening.

[0037] According to the embodiments described above, the remote controller 300 can be arranged in a remote safe area convenient for operation. By infinitely adjusting the valve opening degrees of the test pressure control valve 200 and the return pressure control valve 510 through the remote controller 300, not only can the accuracy of pressure adjustment be improved, but also the safety of the test operation can be enhanced.

[0038] In the filling pump 100 test system, as Figure 1 shown, a first pressure detection device 640 is provided between the discharge port and the test pressure control valve 200; a second pressure detection device 650 is provided between the return pressure control valve 510 and the centrifugal pump 520. Both the first pressure detection device 640 and the second pressure detection device 650 are connected to the remote controller 300.

[0039] In an embodiment of the present invention, after the step of adjusting the valve opening degree of the return pressure control valve 510 to the initial valve opening degree k1, the following steps are further included: Adjust the valve opening degree of the test pressure control valve 200 until the pressure value of the output pipeline reaches the specified test pressure value; Conduct a durability test at the specified pressure value until the durability test time reaches the specified test time.

[0040] After determining the initial valve opening degree k1 of the return pressure control valve 510 and during the long-term durability test, the flow rate of the filling pump 100 itself fluctuates. With the accumulation of flow rate fluctuations over a long test time, there is also a risk of overflow in the filling pump hopper 180.

[0041] Therefore, in an embodiment of the present invention, after the step of adjusting the valve opening degree of the return pressure control valve 510 to the initial valve opening degree k1 and before the step of adjusting the valve opening degree of the test pressure control valve 200 until the pressure value of the output pipeline reaches the specified test pressure value, the following steps are further included: Record the liquid level value Lc in the filling pump hopper 180 at this time; During the step of conducting a durability test at the specified pressure value until the durability test time reaches the specified test time, based on the relationship between the liquid level value Lc and the target liquid level value, the PID regulator automatically adjusts the valve opening degree of the return pressure control valve 510.

[0042] Specifically, in an embodiment of the present invention, the step of the PID regulator automatically adjusting the valve opening degree of the return pressure control valve 510 based on the relationship between the liquid level value Lc and the target liquid level range specifically includes: When the liquid level value is within the target liquid level range, keep the valve opening degree of the return pressure control valve 510 unchanged; When the liquid level value is outside the target liquid level range, the valve opening of the reflux pressure control valve 510 is increased or decreased.

[0043] The remote controller 300 is embedded with a PID regulator, which can automatically adjust the valve opening of the reflux pressure control valve 510 based on the relationship between the liquid level value Lc and the target liquid level range.

[0044] For example, a liquid level detection device 630 is installed in the hopper 180 of the filling pump 100. At the beginning of the durability test, the remote controller 300 adjusts the valve opening of the reflux pressure control valve 510 to the valve opening k1 of the reflux pressure control valve 510 obtained in the bottom test, and records the liquid level value of the liquid level detection device 630 at this time as the initial liquid level value Lc; the centrifugal pump 520 and the filling pump 100 are turned on, so that the filling pump 100 runs stably for a period of time, such as 5 minutes, and then the valve opening of the test pressure control valve 200 is adjusted by the remote controller 300 so that the detection result of the first pressure detection device 640 reaches the test specified value, so as to conduct a durability test. During the entire process of the durability test, the liquid level detection device 630 continuously monitors the liquid level L of the fluid medium in the hopper 180. If the liquid level L in the hopper 180 is outside Lc±△L, the PID regulator embedded in the remote controller 300 controls the valve opening of the return pressure control valve 510 until L is within Lc±△L; if the liquid level L in the hopper 180 is within Lc±△L, the durability test is continued until the durability test reaches the target test time. For example, △L can be 5mm.

[0045] In order to prevent the fluid medium temperature from being too high and affecting the durability test, such as Figure 1 As shown, a cooling circulation pump 720 and a cooling tower 710 are provided in the filling pump 100 test system. The cooling tower 710 is connected to the liquid tank 400 , and the cooling circulation pump 720 is provided between the cooling tower 710 and the liquid tank 400 .

[0046] In one embodiment of the present invention, the filling pump durability test method further includes: after the filling pump 100 is running, first starting the cooling circulation pump 720 to circulate and cool the liquid flow in the liquid tank 400; then starting the centrifugal pump 520 to pump the liquid flow in the liquid tank 400 into the filling pump hopper 180.

[0047] During the durability test, after the remote controller 300 adjusts the valve opening of the return pressure control valve 510 to k1 and records the liquid level value of the liquid level detection device 630 as the initial liquid level value Lc, the cooling circulation pump 720 is turned on, so that the liquid medium in the liquid tank 400 enters the cooling tower 710, and the medium cooled by the cooling tower 710 returns to the liquid tank 400. Thus, the liquid in the liquid tank 400 is kept at a low temperature all the time to prevent the medium from getting too hot and ensure the smooth progress of the durability test.

[0048] Generally speaking, as Figure 3 shown, before the durability test, a preliminary test is carried out, that is, the valve opening of the return pressure control valve 510 is determined under the condition that the hopper 180 does not overflow, so as to provide an initial debugging basis for the durability test of the filling pump 100. Specifically, control the filling pump 100 to run and obtain the detection result of the first flow detection device 610; control the centrifugal pump 520 to run; remotely adjust the valve opening of the return pressure control valve 510 until the detection result of the second flow detection device 620 is the same as that of the first flow detection device 610; record the valve opening of the return pressure control valve 510 adjusted remotely in this state and use it as the initial valve opening k1 of the return pressure control valve 510.

[0049] After the preliminary test is completed, the durability test is carried out. Specifically, as Figure 4 and Figure 5 shown, adjust the valve opening of the return pressure control valve 510 to k1; record the initial detection result of the liquid level detection device 630 as LC; start the cooling circulation pump 720 and the centrifugal pump 520; start the filling pump 100 and make the filling pump 100 run stably for a period of time; remotely adjust the valve opening of the test pressure control valve 200 until the detection result of the first pressure detection device 640 reaches the specified test pressure value; start the durability test timing and collect the detection result L of the liquid level detection device 630 in real time, and continuously and automatically adjust the valve opening k of the return pressure control valve 510 based on the relationship between L and Lc±△L to ensure that L is always within the range of Lc±△L until the durability test time reaches the target test time; the durability test of the filling pump 100 ends.

[0050] In the filling pump 100 test system, the filling pump 100 further includes an oil tank 110, a plunger oil pump 120, a plunger oil pump 120 motor, an oil-based overflow valve 130, an oil-based directional valve 140, an oil-based hydraulic cylinder 150, a water-based hydraulic cylinder 160, a water-based swing valve 170, and a hopper 180. A hopper 180 feed inlet is provided on the hopper 180. The plunger oil pump 120 motor drives the plunger oil pump 120 to operate. The plunger oil pump 120 sucks in low-pressure oil from the oil tank 110 and converts it into high-pressure oil for delivery to the oil-based directional valve 140. The oil-based overflow valve 130 is connected in parallel to the main oil circuit to play a role in high-pressure overflow protection. The oil-based directional valve 140 controls the forward and backward movement of the oil-based hydraulic cylinder 150. The oil-based hydraulic cylinder 150 is connected to the water-based hydraulic cylinder 160 through a mechanical structure. The oil-based hydraulic cylinder 150 drives the water-based hydraulic cylinder 160 to move forward and backward. The water-based hydraulic cylinder 160 inputs the medium in the filling pump hopper 180 into the discharge port of the filling pump 100 through the water-based swing valve 170.

[0051] In an embodiment of the present invention, before the step of determining the initial valve opening k1 of the return pressure control valve 510 in the durability test based on the flow rate Q1 of the output pipeline and the hopper return flow rate Q2 during the operation of the filling pump 100, it further includes: starting the plunger oil pump motor to drive the plunger oil pump 120 to operate.

[0052] In another embodiment of the present invention, after the step of starting the plunger oil pump motor to drive the plunger oil pump 120 to operate, it further includes: adjusting the oil-based directional valve 140 to drive the water-based hydraulic cylinder 160 to move forward or backward by the oil-based hydraulic cylinder 150.

[0053] That is, through the above steps, the filling pump 100 is made to operate. After the filling pump 100 operates, corresponding preliminary tests and durability tests are carried out.

[0054] In addition, in an embodiment of the present invention, as Figure 1 shown, the filling pump 100 test system further includes: a raised wall 800 for connecting to the hopper 180 of the filling pump 100 to increase the height of the hopper 180 of the filling pump 100. Thereby, it is possible to prevent the medium from splashing, avoid medium loss, and ensure a clean test environment.

[0055] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A filling pump durability test method, characterized in that: The following steps are involved: Based on the flow rate Q1 of the output pipeline and the hopper return flow rate Q2 when the filling pump (100) is running, the initial valve opening k1 of the return pressure control valve (510) in the durability test is determined.

2. The filling pump durability testing method according to claim 1, characterized in that: The step of determining the initial valve opening k1 of the return pressure control valve (510) in the durability test based on the flow rate Q1 of the output pipeline and the hopper return flow rate Q2 when the filling pump (100) is running, specifically includes: When the filling pump (100) is in operation, a flow rate Q1 of the output pipeline is recorded; Continuously adjusting the valve opening of the reflux pressure control valve (510) until the hopper reflux flow rate Q2 is equal to the output pipeline flow rate Q1; It is determined that the valve opening of the return pressure control valve (510) at this time is the initial valve opening k1.

3. The filling pump durability testing method according to claim 2, characterized in that: After the step of determining that the valve opening of the return pressure control valve (510) at this time is the initial valve opening k1, the step further includes: The valve opening of the return pressure control valve (510) is adjusted to the initial valve opening k1.

4. The filling pump durability testing method according to claim 3, characterized in that: After the step of adjusting the valve opening of the return pressure control valve (510) to the initial valve opening k1, the method further comprises: Adjust the valve opening of the test pressure control valve (200) until the pressure value of the output pipeline reaches the specified test pressure value; The durability test is carried out at the specified pressure value until the durability test time reaches the specified test time.

5. The filling pump durability testing method according to claim 4, characterized in that: After the step of adjusting the valve port opening of the return pressure control valve (510) to the initial valve port opening k1 and before the step of adjusting the valve port opening of the test pressure control valve (200) until the pressure value of the output pipeline reaches the specified test pressure value, the method further comprises: Record the liquid level value Lc in the filling pump hopper (180) at this time; In the step of performing a durability test at the specified pressure value until the durability test time reaches the specified test time, the PID regulator automatically adjusts the valve opening of the reflux pressure control valve (510) based on the relationship between the liquid level value Lc and the target liquid level value.

6. The filling pump durability testing method according to claim 5, characterized in that: The step of automatically adjusting the valve opening of the reflux pressure control valve (510) by the PID regulator based on the relationship between the liquid level value Lc and the target liquid level range specifically comprises: When the liquid level value is within the target liquid level range, maintaining the valve opening of the reflux pressure control valve (510) unchanged; When the liquid level value is outside the target liquid level range, the valve opening of the return pressure control valve (510) is increased or decreased.

7. The filling pump durability testing method according to any one of claims 1 to 6, characterized in that: Also includes: After the filling pump (100) is running, the cooling circulation pump (720) is started first to circulate the liquid flow in the liquid tank (400) for cooling; The centrifugal pump (520) is then started to pump the liquid in the liquid tank (400) into the filling pump hopper (180).

8. The filling pump durability testing method according to claim 2, characterized in that: The method of adjusting the valve opening of the return pressure control valve (510) includes remotely controlling the electric actuator (210) of the return pressure control valve (510); The method for adjusting the valve opening of the test pressure control valve (200) includes remotely controlling an electric actuator (210) of the test pressure control valve (200).

9. The filling pump durability testing method according to claim 1, characterized in that: Before the step of determining the initial valve opening k1 of the return pressure control valve (510) in the durability test based on the flow rate Q1 of the output pipeline and the hopper return flow rate Q2 when the filling pump (100) is running, the method further includes: The plunger oil pump motor is started so that the plunger oil pump motor drives the plunger oil pump (120) to operate.

10. The filling pump durability testing method according to claim 9, characterized in that: After the step of starting the plunger oil pump motor so that the plunger oil pump motor drives the plunger oil pump (120) to operate, the step further includes: The oil-based reversing valve (140) is adjusted so that the oil-based hydraulic cylinder (150) drives the water-based hydraulic cylinder (160) to move forward or backward.

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