A parallel test system for the pressure threshold of multi-channel proportional valves

Abstract

The invention discloses a parallel testing system for the pressure resistance threshold of a multi-channel proportional valve, which belongs to the technical field of proportional valve testing equipment, and comprises: a machine platform, a protective glass plate is installed on the top of the machine platform, and a plurality of conveying ports are equidistantly opened on the front end surface of the protective glass plate; a guide rail is arranged in parallel at each of the conveying ports, and a model seat is slidably installed on the guide rail; an electric cylinder is horizontally arranged in the machine platform, and one end of a plurality of electric cylinders is respectively connected to the lower end surface of each model seat; a plurality of electric control units are arranged in an arranged manner, each electric control unit is arranged above the machine platform and located in the protective glass plate, and the electric control unit is arranged in a one-to-one correspondence with the model seat; a pressure delivery mechanism is arranged in the machine platform, and the pressure delivery mechanism is connected in parallel with the proportional valves on each of the model seats; the invention can realize synchronous testing and evaluation of a plurality of proportional valves, thereby obtaining the pressure resistance threshold of each proportional valve, and can quickly complete large-scale proportional valve testing, thereby improving testing efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of proportional valve testing equipment, and in particular is a multi-channel proportional valve pressure resistance threshold parallel testing system. Background Art

[0002] As a high-precision and high-reliability hydraulic control component, proportional valves are widely used in many fields. Through precise electrical signal control, proportional valves can achieve continuous adjustment of hydraulic systems to meet the needs of different working conditions. At present, with the continuous advancement of technology, the performance and application scope of proportional valves are also expanding, and their pressure resistance threshold has become one of the important indicators for evaluating proportional valves.

[0003] The invention patent with publication number CN118275056B in the existing technology can use an impact plate to form impacts in different areas on the proportional solenoid valve, so as to obtain the influence of external force impact on the durability of the proportional solenoid valve seal; although the tolerance of the proportional valve is evaluated to a certain extent, the pressure resistance threshold of the proportional valve in long-term actual use cannot be obtained; and the invention patent with publication number CN112747917B can effectively measure the opening pressure of the main valve port of the oil supply valve by controlling the pressure of the pressure cylinder. Since only the valve port pressure test of one oil supply valve can be achieved in the measurement, it is impossible to achieve parallel testing of multiple oil supply valves, resulting in repeated experiments for verification, and low test efficiency; and the simulation degree of the oil supply valve reduction test is low, and the oil supply valve is difficult to reach the normal use state, resulting in deviations between the subsequently collected data and the actual situation;

[0004] Therefore, it is necessary to provide a multi-channel proportional valve pressure threshold parallel testing system to solve the problems raised in the above background technology. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solution: a multi-channel proportional valve pressure threshold parallel testing system, comprising:

[0006] A machine platform, on which a protective glass plate is installed, and a front end surface of the protective glass plate is provided with a plurality of conveying openings at equal intervals;

[0007] A guide rail is arranged in parallel at each of the conveying ports, and a model seat is slidably mounted on the guide rail, and the model seat is used for horizontally fixing and supporting each proportional valve to be tested;

[0008] An electric cylinder is horizontally arranged in the machine platform, and one end of each of the electric cylinders is connected to the lower end surface of each of the model seats;

[0009] An electric control unit, which is arranged in a plurality, each of which is arranged above the machine table and inside the protective glass plate, and each of which corresponds to the model seat, and is used to provide downward pressure positioning for the proportional valve on the model seat, and is electrically connected to two electric control plugs of the proportional valve, so as to adjust the opening size of the proportional valve through corresponding electric control;

[0010] A pressure delivery mechanism is arranged in the machine platform, and the pressure delivery mechanism is connected in parallel with the proportional valves on each of the model seats so as to simultaneously deliver pressure liquid to each of the proportional valves during the test;

[0011] The pressure delivery mechanism comprises:

[0012] The sealing cylinder has a partition plate disposed in the middle of the sealing cylinder, and the partition plate divides the upper and lower parts of the sealing cylinder into two independent chambers;

[0013] A straight channel is vertically arranged in the sealing cylinder with the same center, and the lower end of the straight channel is connected to a delivery pipe, and the delivery pipe continuously delivers pressure liquid;

[0014] Side through holes are circumferentially opened on the side wall of the straight channel and located at each of the independent cavities;

[0015] The outer valve seat is circumferentially distributed on the side wall of the sealing cylinder, and the outer side of each of the outer valve seats is connected to a connecting pipe, and the other end of the connecting pipe is connected to a flow meter, and the flow meter is connected to each of the proportional valves through a transfer pipe;

[0016] A flow-changing component is arranged in the upper independent cavity, and the flow-changing component dynamically changes the pressure liquid flowing in each outer valve seat, so that the pressure liquid entering each proportional valve is different and changes continuously and dynamically;

[0017] A flow stabilizing component is arranged in the independent cavity below, a flow diverter is arranged outside the flow meter, and the flow stabilizing component is connected with the flow meter through the flow diverter;

[0018] An inner shaft tube is rotatably connected in the straight channel, the outer wall of the inner shaft tube is in sealing contact with the inner wall of the straight channel, and a first channel and a second channel distributed up and down are opened on the side wall of the inner shaft tube, and the first channel and the second channel are both arranged corresponding to the side through hole; the first channel and the second channel are staggered, so that after the proportional valve is adjusted to the test opening in the test, the flow stabilizing component sends the pressure liquid into the proportional valve at a constant pressure through each second channel and continues for a cycle of test time, so that the proportional valve enters the test state, and the flow variable component sends the pressure liquid into the proportional valve through each first channel with a variable pressure, so as to record and obtain the state change of each proportional valve.

[0019] Preferably, two tubes are vertically fixed in the middle of the model seat, and the upper ends of the tubes are rotatably connected with external screw sleeves, and each of the external screw sleeves is sealingly threadedly connected to the inlet end and the outlet end of the proportional valve;

[0020] A fixed pipe is connected to the bottom of the tube, the inlet end of the proportional valve is connected to the transfer tube through the fixed pipe, and the outlet end of the proportional valve is connected to an external drainer through the fixed pipe.

[0021] Preferably, the electrical control unit comprises:

[0022] A plate frame is vertically fixed on the machine platform, and two connecting rails are arranged in parallel on the plate frame;

[0023] A connecting plate is slidably connected to each of the connecting rails through a slider, and the two connecting plates are arranged in parallel up and down;

[0024] A central tooth is centrally rotatably connected to the plate frame and is located between the two connecting rails. The central tooth is connected to the upper and lower connecting plates for transmission through gear meshing;

[0025] A telescopic guide column is vertically fixed on each of the connecting plates, and a pressing plate frame is fixed to the telescopic end of each of the telescopic guide columns. An inverted U-shaped notch is horizontally opened below each of the pressing plate frames, and the pressing plate frame is pressed down through the notch to contact the end of the proportional valve;

[0026] A pneumatic telescopic rod is vertically fixed on one side of the telescopic guide column, and one end of the pneumatic telescopic rod is connected to the telescopic end of the telescopic guide column;

[0027] An electric contact body is horizontally slidably connected to the pressure plate frame through a guide shaft, and a connector is provided on the electric contact body, and the connector is connected and matched with the proportional valve electric control plug;

[0028] The electric telescopic rod is horizontally fixed on the pressure plate frame, and the other end of the electric telescopic rod is connected to the electric contact.

[0029] Preferably, the flow stabilizing component comprises:

[0030] An inner ring seat 1 is coaxially fixed in an independent cavity at the lower part of the sealing cylinder, and a plurality of bypass channels 1 are circumferentially distributed on the side wall of the inner ring seat 1, and each of the bypass channels 1 is connected to the outer valve seat correspondingly;

[0031] A flow stabilizing ring, the center of which is arranged in the inner ring seat 1, a connecting rib is fixed outside the flow stabilizing ring, and the other end of the connecting rib is connected to the inner ring seat 1;

[0032] The flow stabilizing holes are evenly distributed on the side wall of the flow stabilizing ring.

[0033] Preferably, the converter assembly comprises:

[0034] The second inner ring seat is coaxially fixed in an independent cavity above the sealing cylinder, and a plurality of second bypass channels are circumferentially distributed on the side wall of the second inner ring seat, and each of the second bypass channels is connected to the outer valve seat correspondingly;

[0035] The adjusting ring is centrally arranged in the inner ring seat 2, and the outer wall of the adjusting ring is in sealing contact with the side wall of the inner ring seat 2; and a plurality of connecting hole groups are distributed on the circumference of the adjusting ring.

[0036] Preferably, the adjustment ring is rotationally connected to the inner ring seat 2, and a driving part is provided in the inner ring seat 2, and the driving part is connected to the adjustment ring for transmission through gear meshing.

[0037] Preferably, the connecting hole group is composed of a plurality of micro-holes arranged axially along the adjusting ring; the number of micro-holes in each connecting hole group decreases gradually in the counterclockwise direction along the adjusting ring;

[0038] Each of the second bypass channels is simultaneously connected to three adjacent connecting hole groups on the adjusting ring.

[0039] Preferably, when the adjusting ring in the flow-changing assembly remains stationary, the flow rates of the pressure liquid flowing into each of the outer valve seats are different; and the driving unit drives the adjusting ring to deflect in the forward and reverse directions, and the deflection angle is not greater than 15°, at which time the flow rates of the pressure liquid in each of the outer valve seats undergo a fluctuating change.

[0040] Preferably, when the adjusting ring is continuously rotated and adjusted, the flow rate of the pressure liquid in the outer valve seat changes continuously.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] In the present invention, multiple proportional valves can be placed on each model seat, so that the proportional valves can be tested in parallel through the pressure delivery mechanism, and synchronous testing and evaluation of multiple proportional valves can be achieved, so as to obtain the pressure resistance threshold of each proportional valve, and quickly complete the test of large quantities of proportional valves, thereby improving the test efficiency; the flow stabilizing component and the flow changing component used in the pressure delivery mechanism can correspondingly send the pressure liquid into the proportional valve at a constant pressure or a variable pressure, so that each proportional valve can be restored to the normal use condition as much as possible before the test, so that each proportional valve can be tested more quickly, so as to obtain the real pressure resistance threshold data of each proportional valve in subsequent tests, thereby improving data reliability; the electric control unit also provided can automatically adjust the opening size of each proportional valve to avoid test errors caused by manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0044] Figure 2 is a side sectional view of the present invention;

[0045] Figure 3 It is a structural schematic diagram of the sealing cylinder in the present invention;

[0046] Figure 4 A half-section view of the sealing cylinder of the present invention;

[0047] Figure 5 for Figure 2 A schematic diagram of the structure enlargement in the middle;

[0048] Figure 6 It is a schematic diagram of the three-dimensional structure of the electric control unit in the present invention;

[0049] Figure 7 for Figure 6 A magnified schematic diagram of the structure at B in the middle;

[0050] Figure 8 It is a front view of the electric control unit in the present invention;

[0051] Fig. 9 It is a structural schematic diagram of the flow stabilizing component in the present invention;

[0052] Fig.10 It is a structural schematic diagram of the current conversion component in the present invention;

[0053] Fig.11 It is a schematic diagram of the structure of the adjustment ring in the present invention;

[0054] In the figure: 1. machine platform; 11. protective glass plate; 12. model seat; 13. guide rail; 14. electric cylinder; 15. tube; 16. outer screw sleeve; 17. fixed tube; 2. electric control unit; 21. plate frame; 22. connecting rail; 23. connecting plate; 24. center gear; 25. telescopic guide column; 26. pressing plate frame; 27. pneumatic telescopic rod; 28. electric contact; 29. ​​electric telescopic rod; 3. pressure delivery mechanism; 31. Sealing cylinder; 32, independent cavity; 33, straight channel; 34, outer valve seat; 35, connecting pipe; 36, flow meter; 37, diverter; 4, flow changing assembly; 41, inner ring seat two; 42, bypass channel two; 43, adjusting ring; 44, connecting hole group; 5, flow stabilizing assembly; 51, inner ring seat one; 52, bypass channel one; 53, flow stabilizing ring; 54, connecting rib; 6, inner shaft tube; 61, first channel; 62, second channel. DETAILED DESCRIPTION

[0055] See also Figure 1-Figure 11 In an embodiment of the present invention, a multi-channel proportional valve pressure threshold parallel testing system includes:

[0056] The machine 1 has a protective glass plate 11 installed on the top thereof, and a front end surface of the protective glass plate 11 is provided with a plurality of conveying openings at equal intervals;

[0057] Guide rails 13 are arranged in parallel at each of the conveying ports, and a model seat 12 is slidably mounted on the guide rails 13. The model seat 12 is used to horizontally and fixedly support each proportional valve to be tested; during the test, each proportional valve can be placed on each model seat 12, and then the model seat 12 is sent into the protective glass plate 11 along the guide rails 13, thereby improving the safety of the test and avoiding potential safety hazards;

[0058] The electric cylinder 14 is horizontally arranged in the machine 1, and one end of each of the electric cylinders 14 is connected to the lower end surface of each of the model seats 12;

[0059] The electric control unit 2 is arranged in a plurality, each of which is arranged above the machine table 1 and inside the protective glass plate 11. The electric control unit 2 is arranged one by one with the model seat 12, and is used to provide downward pressure positioning for the proportional valve on the model seat 12, and is electrically connected to the two electric control plugs of the proportional valve, so as to adjust the opening of the proportional valve through corresponding electric control; on the one hand, it avoids the operation error caused by manual adjustment of the opening of the proportional valve, and on the other hand, it can quickly respond to the control signal, realize the rapid control of the proportional valve, shorten the adjustment time, and improve the test efficiency;

[0060] A pressure delivery mechanism 3 is arranged in the machine platform 1, and the pressure delivery mechanism 3 is connected in parallel with the proportional valves on the model seats 12, so as to simultaneously deliver pressure liquid to the proportional valves during the test;

[0061] The pressure delivery mechanism 3 comprises:

[0062] The sealing cylinder 31 has a partition plate disposed in the middle thereof, and the partition plate divides the upper and lower parts of the sealing cylinder 31 into two independent chambers 32;

[0063] A straight channel 33 is vertically arranged co-centrically in the sealing cylinder 31, and a delivery pipe is connected to the lower end of the straight channel 33, and the delivery pipe continuously delivers the pressure liquid;

[0064] Side through holes, circumferentially opened on the side wall of the straight channel 33 and located at each of the independent cavities 32;

[0065] The outer valve seats 34 are circumferentially distributed on the side wall of the sealing tube 31. The outer sides of the outer valve seats 34 are connected to connecting pipes 35. The other end of the connecting pipes 35 is connected to flow meters 36. The flow meters 36 are connected to the corresponding proportional valves through transfer pipes.

[0066] The flow-changing component 4 is arranged in the independent cavity 32 at the top, and the flow-changing component 4 dynamically changes the pressure liquid flowing in each outer valve seat 34, so that the pressure liquid entering each proportional valve is different and changes continuously and dynamically;

[0067] The flow stabilizing component 5 is arranged in the independent chamber 32 below, and a flow divider 37 is arranged outside the flow meter 36, and the flow stabilizing component 5 is connected with the flow meter 36 through the flow divider 37;

[0068] The inner shaft tube 6 is rotatably connected in the straight channel 33, the outer wall of the inner shaft tube 6 is in sealing contact with the inner wall of the straight channel 33, and the side wall of the inner shaft tube 6 is provided with a first channel 61 and a second channel 62 distributed up and down, and the first channel 61 and the second channel 62 are both arranged corresponding to the side through hole; the first channel 61 and the second channel 62 are staggered, so that after the proportional valve is adjusted to the test opening during the test, the flow stabilizing component 5 sends the pressure liquid into the proportional valve at a constant pressure through each second channel 62 and continues for a cycle of test time (usually 4h-5h), so that the proportional valve enters the test state, and the variable flow component 4 passes through each first channel 61 The pressure liquid is sent to the proportional valve with a variable pressure so as to record and obtain the state change of each proportional valve; specifically, in the proportional valve test, the pressure liquid is first pre-delivered to the proportional valve. At this time, the pressure liquid can either enter each proportional valve continuously at a constant pressure through the flow stabilizing component 5, or enter each proportional valve with a variable pressure through the flow changing component 4, so that each proportional valve reaches the corresponding test state (that is, each proportional valve can reach a unified or non-unified test state, thereby restoring the corresponding working conditions in different use environments), and then the pressure liquid is isobarically delivered to each proportional valve through the flow stabilizing component 5 based on the theoretical pressure resistance threshold data of the proportional valve, so as to obtain the pressure resistance threshold of each proportional valve under different working conditions.

[0069] In this embodiment, two tubes 15 are vertically fixed in the middle of the model seat 12, and the upper ends of the tubes 15 are rotatably connected with external screw sleeves 16, and each of the external screw sleeves 16 is sealingly threadedly connected to the inlet end and the outlet end of the proportional valve; which can be manually operated to achieve rapid docking of each proportional valve and the tube 15;

[0070] A fixed pipe 17 is connected to the bottom of the tube 15. The inlet end of the proportional valve is connected to the transfer tube through the fixed pipe 17, and the outlet end is connected to an external drainer (not shown in the figure) through the fixed pipe 17. That is to say, the pressure liquid enters the proportional valve through the transfer tube, and then is discharged through the outlet end of the proportional valve and flows into the external drainer for collection.

[0071] As a preferred embodiment, the electric control unit 2 includes:

[0072] A plate frame 21 is vertically fixed on the machine platform 1, and two connecting rails 22 are arranged in parallel on the plate frame 21;

[0073] A connecting plate 23 is slidably connected to each of the connecting rails 22 through a slider, and the two connecting plates 23 are arranged in parallel up and down;

[0074] The center tooth 24 is centrally connected to the plate frame 21 and is located between the two connecting rails 22. The center tooth 24 is connected to the upper and lower connecting plates 23 through gear meshing.

[0075] Telescopic guide pillars 25 are vertically fixed on each of the connecting plates 23. A pressing plate frame 26 is fixed to the telescopic end of each of the telescopic guide pillars 25. An inverted U-shaped notch is horizontally opened below each of the pressing plate frames 26. The pressing plate frame 26 is pressed down through the notch to contact the end of the proportional valve.

[0076] The pneumatic telescopic rod 27 is vertically fixed on one side of the telescopic guide column 25, and one end of the pneumatic telescopic rod 27 is connected to the telescopic end of the telescopic guide column 25; thereby, the telescopic guide column 25 is vertically pressed down to the proportional valve by the pneumatic telescopic rod 27, and at this time, the pressure plate frame 26 can form a downward pressure frame for the proportional valve through the U-shaped notch;

[0077] The electric contact 28 is horizontally slidably connected to the pressure plate frame 26 through a guide shaft, and a connector is provided on the electric contact 28, and the connector is connected and matched with the proportional valve electric control plug;

[0078] The electric telescopic rod 29 is horizontally fixed on the pressure plate frame 26 , and the other end of the electric telescopic rod 29 is connected to the electric contact 28 .

[0079] In this embodiment, the flow stabilizing component 5 includes:

[0080] The inner ring seat 51 is coaxially fixed in the independent cavity 32 at the lower part of the sealing cylinder 31. A plurality of bypass channels 52 are circumferentially distributed on the side wall of the inner ring seat 51. Each bypass channel 52 is connected to the outer valve seat 34 correspondingly.

[0081] A flow stabilizing ring 53, the center of which is arranged in the inner ring seat 1 51, a connecting rib 54 is fixed outside the flow stabilizing ring 53, and the other end of the connecting rib 54 is connected to the inner ring seat 1 51;

[0082] The flow-stabilizing holes are evenly distributed on the side wall of the flow-stabilizing ring 53. That is to say, when the second channel 62 is connected to the side through holes on the straight channel 33, the pressure liquid enters the independent cavity 32 on the lower side through the side through holes. At this time, the pressure liquid can flow and diffuse in the flow-stabilizing ring 53, and enter the bypass channel 1 52 through each flow-stabilizing hole, and finally flow into each proportional valve accordingly, so as to achieve isobaric and stable delivery.

[0083] In this embodiment, the converter assembly 4 includes:

[0084] The second inner ring seat 41 is coaxially fixed in the independent cavity 32 above the sealing cylinder 31. A plurality of second bypass channels 42 are circumferentially distributed on the side wall of the second inner ring seat 41. Each of the second bypass channels 42 is connected to the outer valve seat 34 correspondingly.

[0085] The adjusting ring 43 is centrally arranged in the inner ring seat 41, and the outer wall of the adjusting ring 43 is in sealing contact with the side wall of the inner ring seat 41; a plurality of connecting hole groups 44 are circumferentially distributed on the adjusting ring 43; that is, when the first channel 61 is correspondingly connected with the side through holes on the straight channel 33, the pressure liquid enters the independent cavity 32 on the upper side through the side through holes, and at this time, the pressure liquid can enter each bypass channel 42 through the connecting hole group 44 correspondingly connected with the bypass channel 42.

[0086] In this embodiment, the adjustment ring 43 is rotationally connected to the second inner ring seat 41 , and a driving part (not shown in the figure) is provided in the second inner ring seat 41 , and the driving part is connected to the adjustment ring 43 for transmission through gear meshing.

[0087] In this embodiment, the connecting hole group 44 is composed of a plurality of micro-holes arranged axially along the adjusting ring 43; the number of micro-holes in each connecting hole group 44 decreases gradually in the counterclockwise direction along the adjusting ring 43;

[0088] Each of the second bypass channels 42 is simultaneously connected to three adjacent connecting hole groups 44 on the adjustment ring 43 .

[0089] In this embodiment, when the adjustment ring 43 in the variable flow component 4 remains stationary, the flow rates of the pressure liquid flowing into each of the outer valve seats 34 are different; and the drive unit drives the adjustment ring 43 to deflect in the forward and reverse directions, and the deflection angle is not greater than 15°. At this time, the flow rate of the pressure liquid in each of the outer valve seats 34 forms a fluctuating change, that is, when the adjustment ring 43 is in reciprocating deflection adjustment, the number of micropores connected to the bypass channel 2 42 forms a continuous change, so that the flow rate of the pressure liquid in the bypass channel 2 42 changes accordingly, thereby simulating and restoring the load changes of the proportional valve in actual industrial applications (for example: in engineering machinery, the load during excavation operations will fluctuate with changes in excavation depth and soil properties). By simulating this dynamic load change, the performance and response speed changes of the proportional valve under different load conditions can be effectively restored, so that in subsequent detections, the pressure resistance threshold of the proportional valve under different working conditions can be evaluated and obtained.

[0090] In this embodiment, when the adjustment ring 43 is continuously rotated and adjusted, the pressure liquid flow in the outer valve seat 34 continues to change, and the pressure liquid flow in one of the outer valve seats 34 is directly switched from the maximum value to the minimum value; the proportional valve can be further restored in working conditions such as rapid reversing, emergency braking, rapid unloading, transient impact, etc., such as in actual applications in engineering machinery, die-casting machines, and other fields.

[0091] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-channel proportional valve pressure threshold parallel testing system, characterized in that: It includes: A machine platform (1) is provided with a protective glass plate (11) mounted above the machine platform, wherein a front end surface of the protective glass plate (11) is provided with a plurality of conveying openings at equal intervals; A guide rail (13) is arranged in parallel at each of the conveying ports, a model seat (12) is slidably mounted on the guide rail (13), and the model seat (12) is used to horizontally fix and support each proportional valve to be tested; An electric cylinder (14) is horizontally arranged in the machine platform (1), and one end of each of the electric cylinders (14) is connected to the lower end surface of each of the model seats (12); A plurality of electric control units (2) are arranged in an array, each of the electric control units (2) being arranged above the machine platform (1) and located within the protective glass plate (11), the electric control units (2) being arranged in one-to-one correspondence with the model base (12), and being used to provide downward pressure positioning for the proportional valve on the model base (12), and being electrically connected to two electric control plugs of the proportional valve, thereby adjusting the opening of the proportional valve through corresponding electric control; A pressure delivery mechanism (3) is arranged in the machine platform (1), and the pressure delivery mechanism (3) is connected in parallel with the proportional valves on each of the model seats (12) so as to simultaneously deliver pressure liquid to each of the proportional valves during testing; The pressure delivery mechanism (3) comprises: A sealing cylinder (31) having a partition plate disposed in the middle of the sealing cylinder (31), wherein the partition plate divides the upper and lower parts of the sealing cylinder (31) into two independent chambers (32); A straight channel (33) is co-centeredly arranged vertically in the sealing cylinder (31), the lower end of the straight channel (33) being connected to a delivery pipe, and the delivery pipe continuously delivers pressure liquid; A side through hole, circumferentially opened on the side wall of the straight channel (33) and located at each of the independent cavities (32); The outer valve seats (34) are circumferentially distributed on the side wall of the sealing cylinder (31); the outer sides of the outer valve seats (34) are connected to connecting pipes (35); the other ends of the connecting pipes (35) are connected to flow meters (36); the flow meters (36) are connected to the corresponding proportional valves via transfer pipes; A flow-changing component (4) is arranged in the upper independent chamber (32), and the flow-changing component (4) performs dynamic flow-changing regulation on the pressure liquid flowing in each outer valve seat (34), so that the pressure liquid entering each proportional valve is different and changes continuously and dynamically; A flow stabilizing component (5) is arranged in the independent chamber (32) below, a flow divider (37) is arranged outside the flow meter (36), and the flow stabilizing component (5) is connected to the flow meter (36) via the flow divider (37); An inner shaft tube (6) is rotatably connected in the straight channel (33), the outer wall of the inner shaft tube (6) is in sealing contact with the inner wall of the straight channel (33), and a first hole (61) and a second hole (62) are provided on the side wall of the inner shaft tube (6) and are distributed up and down, and the first hole (61) and the second hole (62) are both arranged corresponding to the side through hole; the first hole (61) and the second hole (62) are staggered, so that after the proportional valve is adjusted to the test opening during the test, the flow stabilizing component (5) sends the pressure liquid into the proportional valve at a constant pressure through each second hole (62) and continues for a cycle of test time, so that the proportional valve enters the test state, and the flow changing component (4) sends the pressure liquid into the proportional valve at a variable pressure through each first hole (61), so as to record and obtain the state change of each proportional valve.

2. A multi-channel proportional valve pressure threshold parallel testing system according to claim 1, characterized in that: Two tubes (15) are vertically fixed in the middle of the model seat (12), and the upper ends of the tubes (15) are rotatably connected to external screw sleeves (16), and each of the external screw sleeves (16) is sealingly threadedly connected to the inlet end and the outlet end of the proportional valve; A fixed pipe (17) is connected to the bottom of each of the tubes (15); the inlet end of the proportional valve is connected to the transfer pipe via the fixed pipe (17), and the outlet end of the proportional valve is connected to an external drainer via the fixed pipe (17).

3. A multi-channel proportional valve pressure threshold parallel testing system according to claim 1, characterized in that: The electric control unit (2) comprises: A plate frame (21) is vertically fixed on the machine platform (1), and two connecting rails (22) are arranged in parallel on the plate frame (21); A connecting plate (23) is slidably connected to each of the connecting rails (22) via a slider, and the two connecting plates (23) are arranged in parallel up and down; A central tooth (24) is centrally rotatably connected to the plate frame (21) and is located between the two connecting rails (22), wherein the central tooth (24) is connected to the upper and lower connecting plates (23) for transmission through gear meshing; A telescopic guide column (25) is vertically fixed on each of the connecting plates (23); a pressing plate frame (26) is fixed to the telescopic end of each of the telescopic guide columns (25); an inverted U-shaped notch is horizontally opened below each of the pressing plate frames (26); the pressing plate frame (26) is pressed down through the notch to contact the end of the proportional valve; A pneumatic telescopic rod (27) is vertically fixed on one side of the telescopic guide column (25), and one end of the pneumatic telescopic rod (27) is connected to the telescopic end of the telescopic guide column (25); An electric contact (28) is horizontally slidably connected to the pressure plate frame (26) via a guide shaft, and a connector is provided on the electric contact (28), and the connector is connected and matched with an electric control plug of a proportional valve; An electric telescopic rod (29) is horizontally fixed on the pressure plate frame (26), and the other end of the electric telescopic rod (29) is connected to the electric contact (28).

4. A multi-channel proportional valve pressure threshold parallel testing system according to claim 1, characterized in that: The flow stabilizing component (5) comprises: An inner ring seat (51) is coaxially fixed in an independent cavity (32) at a lower portion of the sealing cylinder (31), and a plurality of bypass channels (52) are circumferentially distributed on a side wall of the inner ring seat (51), and each bypass channel (52) is connected to a corresponding outer valve seat (34); A flow stabilizing ring (53), the center of which is arranged in the inner ring seat (51); a connecting rib (54) is fixed to the outside of the flow stabilizing ring (53); the other end of the connecting rib (54) is connected to the inner ring seat (51); The flow stabilizing holes are evenly distributed on the side wall of the flow stabilizing ring (53).

5. The multi-channel proportional valve pressure threshold parallel testing system according to claim 1, characterized in that: The variable flow component (4) comprises: The second inner ring seat (41) is coaxially fixed in the independent cavity (32) above the sealing cylinder (31), and a plurality of second bypass channels (42) are circumferentially distributed on the side wall of the second inner ring seat (41), and each of the second bypass channels (42) is connected to the outer valve seat (34) in a corresponding manner; An adjusting ring (43) is centrally arranged in the second inner ring seat (41), and an outer wall of the adjusting ring (43) is in sealing contact with a side wall of the second inner ring seat (41); and a plurality of connecting hole groups (44) are distributed on the circumference of the adjusting ring (43).

6. A multi-channel proportional valve pressure threshold parallel testing system according to claim 5, characterized in that: The adjusting ring (43) is rotationally connected to the second inner ring seat (41), and a driving part is provided in the second inner ring seat (41), and the driving part is connected to the adjusting ring (43) for transmission through gear meshing.

7. A multi-channel proportional valve pressure threshold parallel testing system according to claim 6, characterized in that: The connecting hole group (44) is composed of a plurality of micro-holes arranged axially along the adjustment ring (43); the number of micro-holes in each connecting hole group (44) gradually decreases in the counterclockwise direction along the adjustment ring (43); Each of the second bypass channels (42) is simultaneously connected to three adjacent connecting hole groups (44) on the adjustment ring (43).

8. A multi-channel proportional valve pressure threshold parallel testing system according to claim 7, characterized in that: When the adjustment ring (43) in the variable flow assembly (4) remains stationary, the flow rates of the pressure liquid flowing into each of the outer valve seats (34) are different; and the drive unit drives the adjustment ring (43) to deflect in the forward and reverse directions, and the deflection angle is not greater than 15°. At this time, the flow rates of the pressure liquid in each of the outer valve seats (34) fluctuate.

9. A multi-channel proportional valve pressure threshold parallel testing system according to claim 6, characterized in that: When the adjusting ring (43) is continuously rotated and adjusted, the flow rate of the pressure liquid in the outer valve seat (34) continuously changes.

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