Liquid sprayer test system and test method

Abstract

The invention discloses a liquid sprayer test system and test method, and relates to the field of liquid sprayer test, and the system comprises a main oil tank which is connected with an oil inlet valve block in a clamping device through a plurality of main oil pumps which are connected in parallel, an electromagnetic overflow valve, a proportional overflow valve, an energy accumulator and an electromagnetic two-way cartridge valve in sequence. The oil inlet valve block can be communicated with a liquid sprayer mounted on the oil inlet valve block; the clamping device further comprises an oil outlet valve block, and the liquid sprayer sprays liquid in the oil outlet valve block. An oil outlet of the oil outlet valve block is communicated with the calibration oil inlet pipe through the mass flow meter; the switching device is used for switching the oil outlet of the calibration oil inlet pipe between the communication with the calibration oil tank and the communication with the main oil tank; the calibration oil tank is placed on the electronic balance, and liquid in the calibration oil tank flows back to the main oil tank through the oil return pump. A differential pressure gauge is arranged on the oil outlet valve block, and a thermometer is arranged on the oil inlet valve block. According to the invention, performance such as parameter stability, constant-flow measurement time and constant-time measurement flow of the liquid sprayer can be tested.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of liquid sprayer testing, and in particular to a liquid sprayer testing system and testing method. BACKGROUND

[0002] A liquid sprayer is a main component for spraying liquid. For example, a liquid sprayer is an important core execution element of a modern internal combustion engine fuel supply system, and its function is to accurately meter, atomize, and spray fuel at a moving pressure to a specific location of the engine. Testing of the liquid sprayer is a key link for ensuring its performance, reliability, and liquid spraying parameters.

[0003] Current liquid sprayer testing systems are relatively mature. For example, a Chinese patent with publication number CN219101494U discloses an experimental platform for calibrating a liquid sprayer, which integrates a liquid pulse simulator, a high-pressure rail pipe, and a double cylinder, and has the advantage of supporting real-time calibration of the opening / closing pressure of the liquid sprayer. Another example is a Chinese patent with publication number CN01239722U, which discloses a digital diesel engine liquid sprayer test bench. The test bench replaces a mechanical pressure gauge with a pressure sensor and a single-chip microcomputer to achieve digital memory of the start spraying pressure. However, current technical solutions have the disadvantages of insufficient flow regulation capability, poor pressure stability, a complicated calibration process, and tedious manual operation.

[0004] Therefore, there is an urgent need to develop a liquid sprayer testing system with wide flow coverage, high stability, and full automation. SUMMARY

[0005] The present application aims to provide a liquid sprayer testing system and testing method to address the above-mentioned problems, achieve wide flow coverage, high-precision stable control, full-process automation, and safe and reliable operation of liquid sprayer testing, significantly improve testing efficiency and data reliability, and be suitable for mass production testing and research and development verification of various types of liquid sprayers.

[0006] The technical scheme adopted by the present application is as follows: a liquid sprayer test system, comprising a main oil tank, an oil outlet of the main oil tank being communicated with a plurality of mutually parallel main oil pumps, an oil outlet of each main oil pump 13 being communicated with an oil inlet of an electromagnetic overflow valve 14 through a one-way valve, an oil outlet of the electromagnetic overflow valve 14 being communicated with an energy accumulator 8; the energy accumulator being provided with a proportional overflow valve at an oil port, overflow ports of the electromagnetic overflow valve and the proportional overflow valve being communicated with the main oil tank; the oil port of the energy accumulator being connected to an oil inlet valve block in a clamping device through an electromagnetic two-way cartridge valve, and being able to be communicated with a liquid sprayer installed on the oil inlet valve block; the clamping device further comprising an oil outlet valve block capable of moving away from and close to the oil inlet valve block, an oil inlet of the oil outlet valve block being opposite to the oil inlet valve block, and the oil outlet valve block being assembled on a driving device capable of driving the oil outlet valve block to move away from and close to the oil inlet valve block; an oil outlet of the oil outlet valve block being connected with a mass flow meter, an outlet of the mass flow meter being communicated with a calibration oil inlet pipe in a switching device, the switching device being installed between a calibration oil tank and the main oil tank, and being used for switching the oil outlet of the calibration oil inlet pipe between being communicated with the calibration oil tank and being communicated with the main oil tank, the calibration oil tank being placed on an electronic balance, an inside of the calibration oil tank being communicated with the main oil tank through a return oil pipe, and a return oil pump being arranged on the return oil pipe; a differential pressure meter being arranged on the oil outlet valve block, and a thermometer being arranged on the oil inlet valve block.

[0007] Further, at least one filter exists between the electromagnetic overflow valve and the energy accumulator, and the filtering precision of the filter gradually increases along the direction of liquid flow.

[0008] Further, the oil inlet valve block is assembled with a clamping tool part one, the clamping tool part one being provided with a positioning pipe opening, an axis of the positioning pipe opening being collinear with an axis of the oil outlet of the oil inlet valve block; the oil outlet valve block is assembled with a clamping tool part two, the clamping tool part two being provided with a positioning pipe sleeve, an axis of the positioning pipe sleeve being collinear with an axis of the oil inlet of the oil outlet valve block; the axis of the positioning pipe sleeve is collinear with the axis of the positioning pipe opening, and is parallel to the direction in which the oil outlet valve block moves away from and close to the oil inlet valve block, so that the positioning pipe opening and the positioning pipe sleeve cooperate to clamp the liquid sprayer installed on the oil inlet valve block.

[0009] Further, the clamping device further comprises a support, the support being provided with a guide rod, an axis of the guide rod being parallel to the axis of the positioning pipe sleeve or the positioning pipe opening; the driving device is installed on the support, the driving device being provided with a guide plate on an output shaft, the guide rod penetrating through the guide plate, and the oil outlet valve block being installed on the guide plate; the guide rod is installed with an upper limiting piece and a lower limiting piece, and the guide plate is located between the upper limiting piece and the lower limiting piece.

[0010] Further, a one-way valve is arranged between the oil outlet valve block and the mass flow meter.

[0011] Further, the switching device comprises a switching driver and a shunt, the shunt having two flow channels, one of which is in communication with the calibration oil tank and the other of which is in communication with the main oil tank; the calibration oil inlet pipe is installed on the output shaft of the switching driver, and the two flow channels are arranged in the movement path of the calibration oil inlet pipe.

[0012] Further, an oil temperature machine is further included, and the oil inlet and outlet of the oil temperature machine are in communication with the main oil tank.

[0013] Further, the main oil tank is provided with a circulating oil port, the circulating oil port being in communication with the oil inlet section of the oil return pump; and the oil return pipe is provided with a filtering device at a position in communication with the main oil tank.

[0014] Further, the oil return pipe is provided with a venting bypass, and the venting bypass is provided with a venting valve.

[0015] A liquid sprayer test method, using the liquid sprayer test system, sequentially performing four test items of stability test, standard part test, constant flow time measurement, and constant time flow measurement, comprising the following steps: S1: stability test, comprising steps S11-S14; S11: installing a standard liquid sprayer on clamping tool part one, starting the driving device, driving the clamping tool part two to move towards the clamping tool part one, clamping the standard liquid sprayer together with the clamping tool part one, and completing the clamping installation of the standard liquid sprayer; S12: according to the flow size of the standard liquid sprayer, starting the required main oil pump, the main oil pump extracting liquid from the main oil tank and sending it into the electromagnetic overflow valve, after the excess liquid oil is overflowed by the electromagnetic overflow valve, the remaining liquid oil sequentially passes through multiple filters, proportional overflow valves, accumulators, and electromagnetic two-way valves and enters the standard liquid sprayer; S13: after the liquid oil enters the standard liquid sprayer, the standard liquid sprayer starts to spray liquid, the spraying time is determined, and during the spraying time, the temperature of the liquid before entering the standard liquid sprayer is obtained by a thermometer, and the liquid oil pressure difference before and after the standard liquid sprayer is measured by a differential pressure meter, to determine whether the temperature and liquid oil pressure difference can be stabilized within the required range, if not, the cause is investigated and adjusted until it can be stabilized within the required range; S14: in step S1, the liquid sprayed by the standard liquid sprayer flows back to the main oil tank through the oil outlet valve block, the mass flow meter, and the calibration oil inlet pipe; S2: on the basis of step S13, the standard part test is performed to detect whether the standard liquid sprayer meets the requirements in the time-flow relationship, if not, the cause is investigated and adjusted until the time-flow relationship meets the requirements, indicating that the standard liquid sprayer test system is qualified and can be used for subsequent testing of standard liquid sprayer samples; S21: In the above step S2, the liquid oil sprayed by the standard sprayer flows into the calibration oil tank through the oil outlet valve block and the calibration oil inlet pipe, and the accuracy of the calibration mass flow meter is verified by obtaining the liquid mass by the electronic balance; S3: On the basis of step S2, the standard sprayer is replaced by a sprayer sample, and the flow rate measurement time or / and the time measurement flow rate of the sprayer sample are carried out, including steps S31-S33; S31: The flow rate measurement time is carried out, the mass of the liquid oil sprayed by the sprayer sample is obtained by the mass flow meter, the actual time required for the cumulative liquid oil sprayed by the sprayer sample to reach the target mass is determined, and the actual time is compared with the required standard time. If it is within the tolerance range of the standard time, it is determined that the sprayer sample is qualified; if it exceeds the tolerance range of the standard time, it is determined that the sprayer sample is unqualified; S32: The time measurement flow rate is carried out, the mass of the liquid oil sprayed by the sprayer sample is obtained by the mass flow meter, the actual mass of the liquid oil sprayed by the sprayer sample within the specified time is determined, and the actual mass is compared with the required standard mass. If it is within the tolerance range of the standard mass, it is determined that the sprayer sample is qualified; if it exceeds the tolerance range of the standard mass, it is determined that the sprayer sample is unqualified; S33: In the above step S3, the liquid sprayed by the sprayer sample flows back to the main oil tank through the oil outlet valve block, the mass flow meter and the calibration oil inlet pipe.

[0016] As described above, by adopting the above technical scheme, the present application has the following beneficial effects: 1. The present application realizes precise regulation and control of wide range flow by connecting multiple main oil pumps in parallel, and adjusting the flow rate of one main oil pump; 2. The present application reduces the pressure pulsation of the liquid by the accumulator, and improves the stability of the system; 3. The present application sets the safety pressure threshold by the electromagnetic overflow valve, accurately controls the differential pressure formed by the proportional overflow valve, and forms a double-redundancy protection mechanism, which cooperates with the accumulator to improve the safety and compatibility of the system. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be described by examples and with reference to the accompanying drawings, in which: Figure 1 It is a schematic view of the test system from the oblique two sides; Figure 2 It is a schematic view of the test system from the top; Figure 3 It is a schematic view of the test system from the side; Figure 4 It is a schematic view of the clamping device from the oblique two sides; Figure 5 It is a schematic view of the clamping device from the front; Figure 6 This is a schematic diagram of the switching device from two oblique sides; The markings in the diagram are: 1-Main oil tank; 2-Switching device; 3-Calibration inlet pipe; 4-Drive device; 5-Clamping device; 6-Calibration oil tank; 7-Return pipe; 8-Accumulator; 9-Solenoid two-way cartridge valve; 10-Proportional relief valve; 11-Filter; 12-Control assembly; 13-Main oil pump; 14-Solenoid relief valve; 15-Mass flow meter; 16-Oil temperature controller; 17-Electronic balance; 18-Return pump; 19-Bracket; 20-Outlet valve block; 21-Inlet valve block; 22-Thermometer; 23-Clamping fixture component one; 24-Differential pressure gauge; 25-Guide plate; 26-Guide rod; 27-Clamping fixture component two; 28-Positioning sleeve; 29-Switching driver; 30-Diverter; 31-Flow channel. Detailed Implementation

[0018] In the description of this specification, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification.

[0019] Furthermore, the use of terms such as "horizontal" or "vertical" in this specification does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0020] In the description of this specification, it should also be noted that, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” should be interpreted broadly. For example, a link can be a fixed link, a detachable link, or an integral link; it can be a mechanical link or an electrical link; it can be a direct link or an indirect link through an intermediate medium; it can be a connection within two components.

[0021] Example 1 like Figures 1-6As shown, a liquid sprayer test system comprises a main oil tank 1, an oil outlet of the main oil tank 1 is communicated with three parallel main oil pumps 13, two of which are driven by fixed-frequency motors and have a fixed output flow, and the other is driven by a variable-frequency motor, and the output flow of the main oil pump 13 can be changed by changing the input frequency of the variable-frequency motor; in actual work, one main oil pump 13 or two or three main oil pumps 13 can be selected to work according to different flow requirements of different liquid sprayers, and the output flow of the main oil pump 13 driven by the variable-frequency motor is adjusted to meet different flow requirements; for example, the output flow of the single pump of the two main oil pumps 13 driven by the fixed-frequency motor is 140 L / min, the corresponding motor frequency of the main oil pump 13 driven by the variable-frequency motor can be 20-50 Hz, and the output flow can be changed in the range of 80-200 L / min.

[0022] In this embodiment, if the main oil pump 13 has a self-discharging port, the self-discharging port can be communicated with the main oil tank 1 to realize oil return; the test system preferably has a main oil pump 13 with a self-discharging port, which can relieve pressure when the pressure is reduced or the machine is stopped, avoiding pressure impact on the entire system.

[0023] In this embodiment, the oil outlet of each main oil pump 13 is communicated with the oil inlet of the electromagnetic overflow valve 14 through a one-way valve, the electromagnetic overflow valve 14 is closed when powered on to build pressure for the corresponding connected main oil pump 13, and the electromagnetic overflow valve 14 is opened when powered off to relieve pressure for the corresponding connected main oil pump 13; therefore, the electromagnetic overflow valve 14 is used for build pressure and unloading control of the liquid outlet of the main oil pump 13, and the safety pressure is set to avoid the pump outlet pressure exceeding the safety pressure, thereby protecting all hydraulic elements in the system; a pressure sensor can be arranged at the oil inlet of the electromagnetic overflow valve 14 to obtain the liquid pressure of the corresponding main oil pump 13.

[0024] It should be noted that, since the present scheme is a multi-pump parallel scheme, a one-way valve is added to prevent liquid from flowing back to the oil tank from the non-working pump, i.e., to prevent the liquid pressure from rebounding the pump and damaging the pump, thereby ensuring the effective establishment of the liquid pressure.

[0025] In the embodiment, the oil outlet of the electromagnetic overflow valve 14 is communicated with the accumulator 8, the oil port of the accumulator 8 is provided with the proportional overflow valve 10, the oil port of the accumulator 8 is connected to the oil inlet valve block 21 in the clamping device 5 through the electromagnetic two-way cartridge valve 9, and can be communicated with the liquid sprayer installed on the oil inlet valve block 21; wherein: the accumulator 8 is mainly used for eliminating liquid pressure pulsation, so that the pressure before and after the liquid sprayer is more stable, so as to ensure the accuracy of the liquid sprayer flow test, it should be noted that the accumulator 8 needs to be pre-charged with nitrogen before normal work, and the pressure of the nitrogen can be 8-9MPa; the accumulator 8 is provided with a pressure relief ball valve, which is mainly used for relieving the liquid in the accumulator 8, and the pressure relief ball valve is in a closed state when the accumulator 8 is normally working, and needs to be opened only when troubleshooting and maintenance; the proportional overflow valve 10 is used for accurately controlling the difference of the pressure difference before and after the liquid sprayer; the electromagnetic two-way cartridge valve 9 is mainly used for controlling the passage of liquid into the liquid sprayer, and when the electromagnetic two-way cartridge valve 9 is powered on and in an open state, liquid can enter the liquid sprayer. In the embodiment, the clamping device 5 further includes an oil outlet valve block 20 which can be away from and close to the oil inlet valve block 21, the oil inlet of the oil outlet valve block 20 is opposite to the oil inlet valve block 21, and the oil outlet valve block 20 is assembled on the driving device 4 which can drive the oil outlet valve block 20 to be away from and close to the oil inlet valve block 21; the clamping device 5 is mainly used for clamping the tested liquid sprayer, so as to avoid the phenomenon that the nozzle is pushed out by oil pressure and appears to spray outside during the test; specifically, the liquid from the electromagnetic two-way cartridge valve 9 enters the liquid sprayer, the liquid sprayer is subjected to the thrust generated by the liquid pressure when spraying liquid, so that the liquid sprayer is separated from the installation position, therefore, the liquid nozzle is clamped by the clamping device 5, and the clamping pressure needs to be greater than the thrust received by the liquid sprayer; the liquid sprayed by the liquid sprayer enters the oil outlet valve block 20, and flows back to the main oil tank 1 from the oil outlet valve block 20.

[0026] In the embodiment, the oil outlet of the oil outlet valve block 20 is connected with the mass flow meter 15, the mass flow of the liquid flowing out of the oil outlet valve block 20 is obtained through the mass flow meter 15, and then the mass flow of the liquid sprayed by the liquid sprayer is obtained; the outlet of the mass flow meter 15 is communicated with the calibration oil inlet pipe 3 in the switching device 2, the switching device 2 is installed between the calibration oil tank 6 and the main oil tank 1, and is used for switching the oil outlet of the calibration oil inlet pipe 3 between being communicated with the calibration oil tank 6 and being communicated with the main oil tank 1; the calibration oil tank 6 is placed on the electronic balance 17, and the mass flow of the liquid is obtained through the electronic balance 17, so as to verify the accuracy of the mass flow meter 15; the inside of the calibration oil tank 6 is communicated with the main oil tank 1 through the oil return pipe 7, and the oil return pump 18 is arranged on the oil return pipe 7, so as to flow the liquid in the calibration oil tank 6 back to the main oil tank 1 through the oil return pump 18; the differential pressure meter 23 is arranged on the oil outlet valve block 20, and the thermometer 22 is arranged on the oil inlet valve block 21, wherein the differential pressure meter 23 is used for detecting the pressure difference of the liquid sprayer inlet and outlet, and the thermometer 22 is used for obtaining the liquid temperature at the liquid sprayer inlet.

[0027] In the embodiment, all the sensors capable of acquiring data (such as the mass flow meter 15, the differential pressure meter 23, the temperature meter 22, etc.) and the execution elements capable of performing relevant actions according to signals (the main oil pump 13, the electromagnetic overflow valve 14, the proportional overflow valve 10, the electromagnetic two-way cartridge valve 9, the electronic scale 17, and the execution elements in the clamping device 5 and the switching device 2, etc.) can be connected to the control assembly 12, and the data of the acquisition sensors and the control of the execution elements are performed through the control assembly 12 to achieve the purpose of automation. Further, the control assembly 12 is composed of a PLC controller and a human-computer interaction assembly at a PC end.

[0028] In summary, through the above test system, the liquid sprayer can be effectively detected.

[0029] Embodiment 2 On the basis of embodiment 1, a specific implementation manner is further proposed.

[0030] A feasible implementation manner is that at least one filter 11 exists between the electromagnetic overflow valve 14 and the accumulator 8, for example, the number of the filters 11 is 2, and the filtering precision of the filters 11 gradually increases along the direction of the liquid flow. Specifically, the filtering precision of the first filter 11 is 10 μm, and the filtering precision of the second filter 11 is 5 μm along the direction of the liquid flow, so that step-by-step filtration is realized, and the filtration pressure of the filter 11 is reduced. The filter 11 mainly filters and cleans the liquid, and the filtering precision is gradually increased, so that the filtering precision can be ensured, and the filtration intensity of each filter 11 can be reduced. By setting the filter, the valve and the execution mechanism in the subsequent stage are protected, and the phenomenon of blockage is avoided.

[0031] A feasible implementation manner is that the overflow ports of the electromagnetic overflow valve 14 and the proportional overflow valve 10 are communicated with the main oil tank 1, so that overflow oil return is realized.

[0032] It should be noted that the opening degree of the overflow ports of the electromagnetic overflow valve 14 and the proportional overflow valve 10 can be controlled through the control assembly 12, so that the overflow pressure is controlled.

[0033] A feasible implementation, the oil inlet valve block 21 is equipped with a clamping tool part one 23, the clamping tool part one 23 has a positioning pipe orifice, the axis of the positioning pipe orifice is collinear with the axis of the oil outlet of the oil inlet valve block 21;The oil outlet valve block 20 is equipped with a clamping tool part two 27, the clamping tool part two 27 has a positioning pipe sleeve 28, the axis of the positioning pipe sleeve 28 is collinear with the axis of the oil inlet of the oil outlet valve block 20;The axis of the positioning pipe sleeve 28 is collinear with the axis of the positioning pipe orifice, and parallel to the direction of the oil outlet valve block 20 moving away from or close to the oil inlet valve block 21, so that the positioning pipe orifice and the positioning pipe sleeve 28 can clamp the liquid sprayer installed on the oil inlet valve block 21;Using the tool, when installing the liquid sprayer, the liquid sprayer can be directly sleeved on the positioning pipe orifice, then under the driving of the driving device 4, the clamping tool part two 27 moves towards the clamping tool part one 23, until the positioning pipe sleeve 28 is sleeved on the liquid sprayer, realizing the stacking installation of the liquid sprayer, and ensuring the stability of the installation position of the liquid sprayer.

[0034] Further, the clamping tool part one 23 and the clamping tool part two 27 can be respectively installed on the oil inlet valve block 21 and the oil outlet valve block 20 by screws.

[0035] A feasible implementation, the clamping device 5 further comprises a bracket 19, the bracket 19 has a guide rod 26, the axis of the guide rod 26 is parallel to the axis of the positioning pipe sleeve 28 or the positioning pipe orifice;The driving device 4 is installed on the bracket 19, the output shaft of the driving device 4 is provided with a guide plate 25, the guide rod 26 passes through the guide plate 25, and the oil outlet valve block 20 is installed on the guide plate 25;The guide rod 26 is provided with an upper limit piece and a lower limit piece, and the guide plate 25 is located between the upper limit piece and the lower limit piece;The driving device 4 can be a pneumatic cylinder, a linear motor or an oil cylinder, if the driving device 4 is a pneumatic cylinder, the inlet valve and the exhaust valve of the pneumatic cylinder can be connected to the control assembly 12 to realize the automatic control of the extension and retraction of the pneumatic cylinder;The working pressure of the pneumatic cylinder can be selected as 0.6MPa-0.9MPa, when the working pressure is 0.6MPa, the pressing force generated is 12KN, this working parameter can cope with the thrust received by a large number of liquid sprayers, ensure that the thrust is less than the pressing force of the pneumatic cylinder, and further ensure the stability of the position of the liquid sprayer.

[0036] In the present embodiment, the cooperation of the guide plate 25 and the guide rod 26 stabilizes the movement direction of the oil outlet valve block 20, thereby ensuring that the clamping tool component two 27 on the oil outlet valve block 20 can stably clamp the liquid sprayer; the upper and lower limit members can limit the stroke of the oil outlet valve block 20, the upper limit member is used to determine whether the cylinder piston is completely retracted, and the lower limit member is used to detect whether the cylinder piston extends to the position where the liquid sprayer is pressed; the upper and lower limit members can both be electromagnetic induction switches, which can be connected with the control assembly 12, the signals detected by the limit switches are fed back to the electronic control program, and it is judged whether the liquid sprayer is in the clamped state or the released state, if the corresponding state is not detected, the control assembly 12 will control the entire system to no longer perform the next operation; for example, if the control assembly 12 does not obtain the signal of the upper limit member, it indicates that the liquid sprayer can be completely released, at this time, the liquid sprayer cannot be disassembled, so as to prevent damage caused by the liquid sprayer not being completely released; similarly, if the control assembly 12 obtains the signal of the lower limit member, it indicates that the liquid sprayer is not pressed, then the system cannot open the electromagnetic two-way cartridge valve 9, so that the liquid cannot enter the liquid sprayer to spray, so as to ensure the safety of the liquid sprayer. It should be noted that if different models of liquid sprayers are replaced, the positions of the upper and lower limit members can be adjusted, and different geometric sizes of the clamping tool component one 23 and the clamping tool component two 27 can be replaced to meet the installation of the liquid sprayer, therefore, the clamping tool component one 23 and the clamping tool component two 27 can be disassembled by screw installation, and the upper and lower limit members can also be locked on the guide rod 26 by the hoop method.

[0037] In a possible implementation, a one-way valve is arranged between the oil outlet valve block 20 and the mass flow meter 15, so as to prevent the oil in the oil return pipeline from flowing back when the liquid sprayer is taken out or placed.

[0038] In a possible implementation, the switching device 2 comprises a switching driver 29 and a flow divider 30, the flow divider 30 has two flow channels 31, one of which is in communication with the calibration oil tank 6, and the other is in communication with the main oil tank 1; the calibration oil inlet pipe 3 is installed on the output shaft of the switching driver 29, and the two flow channels 31 are arranged on the movement path of the calibration oil inlet pipe 3; the spatial position of the calibration oil inlet pipe 3 is adjusted by the switching driver 29, so that the oil outlet of the calibration oil inlet pipe 3 is opposite to any one of the two flow channels 31, if it is opposite to the flow channel 31 in communication with the main oil tank 1, the liquid sprayed from the liquid sprayer enters the main oil tank 1 through the oil outlet valve block 20 and the mass flow meter 15, which is the main flow path of the liquid when the liquid sprayer sample is tested; if it is opposite to the flow channel 31 in communication with the calibration oil tank 6, the liquid sprayed from the liquid sprayer enters the calibration oil tank 6 through the oil outlet valve block 20 and the mass flow meter 15, which is the main flow path of the liquid when the standard liquid sprayer verification and calibration system is used.

[0039] Further, the switching driver 29 can be a linear motor, or a cylinder, or an oil cylinder; the switching driver 29 can be connected to the control assembly 12 to realize automatic control.

[0040] A feasible implementation also includes an oil temperature machine 16, the oil inlet and outlet of the oil temperature machine 16 are communicated with the main oil tank 1, and a separate liquid circulation loop is arranged between the oil temperature machine 16 and the main oil tank 1, so that the liquid temperature in the main oil tank 1 can be maintained by using the oil temperature machine 16.

[0041] A feasible implementation, the main oil tank 1 is provided with a circulating oil port, the circulating oil port is communicated with the oil inlet section of the oil return pump 18; the return oil pipe 7 is provided with a filtering device at the position communicated with the main oil tank 1; a separate liquid circulation loop is further arranged between the circulating oil port, the oil return pump 18 and the main oil tank 1, so that the liquid in the main oil tank 1 circulates between the main oil tank 1 and the oil return pump 18, passes through the filtering device to complete the filtration of the liquid, avoid too many impurities in the liquid, and further reduce the pressure of the filter 11 on the filtration of the liquid.

[0042] A feasible implementation, the return oil pipe 7 is provided with a vent bypass, the vent bypass is provided with a vent valve, which is used for venting the liquid in the main oil tank 1.

[0043] Embodiment 3 A liquid sprayer test method, using the liquid sprayer test system of any one of the embodiments 1-2, sequentially performing four test items of stability test, standard part test, constant flow time test or / and constant time flow test, including the following steps: S1: stability test, including steps S11-S14; S11: install the standard liquid sprayer on the clamping tool part one 23, start the driving device 4, drive the clamping tool part two 27 to move towards the clamping tool part one 23, clamp the standard liquid sprayer with the clamping tool part one 23, and complete the clamping installation of the standard liquid sprayer; S12: according to the flow size of the standard liquid sprayer, start the required main oil pump 13, the main oil pump 13 extracts the liquid from the main oil tank 1, and sends the liquid into the electromagnetic overflow valve 14, after the excess liquid oil is overflowed through the electromagnetic overflow valve 14, the remaining liquid oil sequentially passes through the multiple filters 11, the proportional overflow valve 10, the accumulator 8, and the electromagnetic two-way valve, and then enters the standard liquid sprayer; S13: After the liquid oil enters the standard sprayer, the standard sprayer starts spraying, and the spraying time is determined. During the spraying time, the temperature of the liquid oil before entering the standard sprayer is obtained by the thermometer 22, and the pressure difference of the liquid oil before and after the standard sprayer is measured by the differential pressure gauge 23. Whether the temperature and the pressure difference can be stabilized in the required range is determined. If it exceeds the required range, the cause is investigated and adjusted until it can be stabilized in the required range. S14: In step S1, the liquid sprayed by the standard sprayer flows back to the main oil tank 1 through the oil outlet valve block 20, the mass flow meter 15, and the calibration oil inlet pipe 3.

[0044] From step S1, it can be seen that step S1 mainly verifies that the liquid temperature and the pressure difference can be in a stable state during system operation, providing a verification environment basis for subsequent tests of sprayer samples.

[0045] S2: On the basis of step S13, the standard part test is performed to detect whether the time-flow relationship of the standard sprayer meets the requirements. If it does not meet the requirements, the cause is investigated and adjusted until the time-flow relationship meets the requirements, indicating that the standard sprayer test system is qualified, and subsequent tests of standard sprayer samples can be performed. S21: In the above step S2, the liquid oil sprayed by the standard sprayer flows into the calibration oil tank 6 through the oil outlet valve block 20 and the calibration oil inlet pipe 3, and the liquid mass is obtained by the electronic balance 17 to verify the accuracy of the calibration mass flow meter 15.

[0046] From step S2, it can be seen that step S2 mainly verifies the accuracy of the mass flow meter 15, providing an accurate data acquisition basis for subsequent tests of sprayer samples.

[0047] S3: On the basis of step S2, the standard sprayer is replaced with a sprayer sample, and the sprayer sample is tested for constant flow time or / and constant time flow, including steps S31-S33. S31: Constant flow time measurement. The mass of the liquid oil sprayed by the sprayer sample is obtained by the mass flow meter 15, and the actual time required for the sprayer sample to spray the cumulative liquid oil to the target mass is determined. The actual time is compared with the required standard time. If it is within the tolerance range of the standard time, the sprayer sample is determined to be qualified. If it exceeds the tolerance range of the standard time, the sprayer sample is determined to be unqualified. S32: Constant time flow measurement. The mass of the liquid oil sprayed by the sprayer sample is obtained by the mass flow meter 15, and the actual mass of the liquid oil sprayed by the sprayer sample within the specified time is determined. The actual mass is compared with the required standard mass. If it is within the tolerance range of the standard mass, the sprayer sample is determined to be qualified. If it exceeds the tolerance range of the standard mass, the sprayer sample is determined to be unqualified. S33: In the above step S3, the liquid sprayed by the sprayer sample is returned to the main oil tank 1 through the oil outlet valve block 20, the mass flow meter 15, and the calibration oil inlet pipe 3.

[0048] The application is not restricted to the foregoing specific embodiments. The application extends to any novel one, or any new combination, of the features disclosed in this specification, and to any novel method or process disclosed, or any novel combination of steps of the disclosed methods or processes.

Claims

1. A liquid sprayer testing system, characterized by: The application relates to a hydraulic system for a hydraulic press, which comprises a main oil tank (1), the oil outlet of the main oil tank (1) being communicated with a plurality of mutually parallel main oil pumps (13), the oil outlet of each main oil pump (13) being communicated with the oil inlet of an electromagnetic overflow valve (14) through a one-way valve, the oil outlet of the electromagnetic overflow valve (14) being communicated with an energy accumulator (8), the oil port of the energy accumulator (8) being provided with a proportional overflow valve (10), the overflow ports of the electromagnetic overflow valve (14) and the proportional overflow valve (10) being communicated with the main oil tank (1), the oil port of the energy accumulator (8) being connected to an oil inlet valve block (21) in a clamping device (5) through an electromagnetic two-way cartridge valve (9) and being communicated with a liquid sprayer installed on the oil inlet valve block (21), the clamping device (5) further comprising an oil outlet valve block (20) capable of moving away from and close to the oil inlet valve block (21), the oil inlet of the oil outlet valve block (20) being opposite to the oil inlet valve block (21), and the oil outlet valve block (20) being assembled on a driving device (4) capable of driving the oil outlet valve block (20) to move away from and close to the oil inlet valve block (21), the oil outlet of the oil outlet valve block (20) being connected with a mass flowmeter (15), the outlet of the mass flowmeter (15) being communicated with a calibration oil inlet pipe (3) in a switching device (2), the switching device (2) being installed between a calibration oil tank (6) and the main oil tank (1) and being used for switching the oil outlet of the calibration oil inlet pipe (3) between being communicated with the calibration oil tank (6) and being communicated with the main oil tank (1), the calibration oil tank (6) being placed on an electronic balance (17), the inside of the calibration oil tank (6) being communicated with the main oil tank (1) through a return oil pipe (7), and a return oil pump (18) being arranged on the return oil pipe (7), a differential pressure meter (23) being arranged on the oil outlet valve block (20), and a thermometer (22) being arranged on the oil inlet valve block (21).

2. The sprayer test system of claim 1, wherein: At least one filter (11) is arranged between the electromagnetic overflow valve (14) and the energy accumulator (8), and the filtering precision of the filter (11) gradually increases along the direction of liquid flow.

3. The sprayer tester system of claim 1, wherein: A clamping tool part one (23) is assembled on the oil inlet valve block (21), the clamping tool part one (23) has a positioning pipe orifice, and the axis of the positioning pipe orifice is collinear with the axis of the oil outlet of the oil inlet valve block (21), a clamping tool part two (27) is assembled on the oil outlet valve block (20), the clamping tool part two (27) has a positioning pipe sleeve (28), the axis of the positioning pipe sleeve (28) is collinear with the axis of the oil inlet of the oil outlet valve block (20), the axis of the positioning pipe sleeve (28) is collinear with the axis of the positioning pipe orifice and parallel to the direction in which the oil outlet valve block (20) moves away from and close to the oil inlet valve block (21), so that the positioning pipe orifice and the positioning pipe sleeve (28) can clamp the liquid sprayer installed on the oil inlet valve block (21).

4. The sprayer test system of claim 3, wherein: The clamping device (5) further comprises a bracket (19) having a guide rod (26) whose axis is parallel to the axis of the positioning sleeve (28) or the positioning pipe; the driving device (4) is installed on the bracket (19), and a guide plate (25) is arranged on the output shaft of the driving device (4), the guide rod (26) passes through the guide plate (25), and the oil outlet valve block (20) is installed on the guide plate (25); the upper and lower limit parts are installed on the guide rod (26), and the guide plate (25) is located between the upper and lower limit parts.

5. The sprayer testing system of claim 3, wherein: A one-way valve is arranged between the oil outlet valve block (20) and the mass flowmeter (15).

6. The sprayer testing system of claim 1, wherein: The switching device (2) comprises a switching driver (29) and a flow divider (30), the flow divider (30) has two flow channels (31), one of which is communicated with the calibration oil tank (6), and the other of which is communicated with the main oil tank (1); the calibration oil inlet pipe (3) is installed on the output shaft of the switching driver (29), and the two flow channels (31) are arranged on the movement path of the calibration oil inlet pipe (3).

7. The sprayer testing system of claim 1, wherein: An oil temperature machine (16) is further arranged, and the inlet and outlet of the oil temperature machine (16) are communicated with the main oil tank (1).

8. The sprayer testing system of claim 1, wherein: The main oil tank (1) is provided with a circulating oil port communicated with the inlet section of the oil return pump (18); and a filtering device is arranged at the position where the oil return pipe (7) is communicated with the main oil tank (1).

9. The sprayer tester system of claim 8, wherein: An emptying bypass is arranged on the oil return pipe (7), and an emptying valve is arranged on the emptying bypass.

10. A liquid sprayer testing method characterized by: The liquid sprayer test system of any one of claims 1-9 is used to sequentially perform four test items of stability test, standard part test, constant flow time test or / and constant time flow test, and comprises the following steps: S1: stability test, comprising steps S11-S14; S11: installing a standard liquid sprayer on the clamping tool part one (23), starting the driving device (4), driving the clamping tool part two (27) to move towards the clamping tool part one (23), clamping the standard liquid sprayer together with the clamping tool part one (23), and completing the clamping installation of the standard liquid sprayer; S12: according to the flow size of the standard liquid sprayer, starting the required main oil pump (13), the main oil pump (13) extracting liquid from the main oil tank (1) and sending it into the electromagnetic overflow valve (14), the remaining liquid oil sequentially passing through a plurality of filters (11), a proportional overflow valve (10), an accumulator (8) and an electromagnetic two-way valve after overflowing the excess liquid oil through the electromagnetic overflow valve (14), and then entering the standard liquid sprayer; S13: after the liquid oil enters the standard liquid sprayer, the standard liquid sprayer starts to spray liquid, the spraying time is determined, the temperature of the liquid before entering the standard liquid sprayer is obtained through the thermometer (22), the liquid oil pressure difference before and after the standard liquid sprayer is measured through the differential pressure meter (23), and whether the temperature and the liquid oil pressure difference can be stabilized in the required range is determined; if the required range is exceeded, the cause is investigated and adjusted until it can be stabilized in the required range. S14: In step S1, the liquid sprayed by the standard sprayer flows back to the main oil tank (1) through the oil outlet valve block (20), the mass flow meter (15) and the calibration oil inlet pipe (3); S2: On the basis of step S13, the standard part test is performed to detect whether the standard sprayer meets the requirements in the time-flow relationship, if not, the cause is investigated and adjusted until the time-flow relationship meets the requirements, indicating that the standard sprayer test system is qualified, and the subsequent test of the standard sprayer sample can be performed; S21: In step S2, the liquid oil sprayed by the standard sprayer flows into the calibration oil tank (6) through the oil outlet valve block (20) and the calibration oil inlet pipe (3), and the accuracy of the calibration mass flow meter (15) is verified by the electronic balance (17) to obtain the liquid mass; S3: On the basis of step S2, the standard sprayer is replaced by the sprayer sample, and the time measurement at a constant flow or / and the flow measurement at a constant time is performed on the sprayer sample, including steps S31-S33; S31: Time measurement at a constant flow, the mass of the liquid oil sprayed by the sprayer sample is obtained by the mass flow meter (15), the actual time required for the sprayer sample to spray the cumulative liquid oil to reach the target mass is measured, and the actual time is compared with the required standard time, if it is within the tolerance range of the standard time, the sprayer sample is determined to be qualified; if it exceeds the tolerance range of the standard time, the sprayer sample is determined to be unqualified; S32: Flow measurement at a constant time, the mass of the liquid oil sprayed by the sprayer sample is obtained by the mass flow meter (15), the actual mass of the liquid oil sprayed by the sprayer sample within the specified time is measured, and the actual mass is compared with the required standard mass, if it is within the tolerance range of the standard mass, the sprayer sample is determined to be qualified; if it exceeds the tolerance range of the standard mass, the sprayer sample is determined to be unqualified; S33: In step S3, the liquid sprayed by the sprayer sample flows back to the main oil tank (1) through the oil outlet valve block (20), the mass flow meter (15) and the calibration oil inlet pipe (3).

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