Cylinder test system, method and device using rodless cylinder equivalent load

Abstract

The invention provides an air cylinder testing system, method and device using rodless air cylinder equivalent load, and particularly relates to the rodless air cylinder testing field, and the system comprises a load air cylinder, a tested air cylinder, a plurality of solenoid valves, a plurality of throttle valves and a plurality of pressure transmitters. The circuit for testing the system comprises a main control chip MCU, an optocoupler module for level signal input, a relay module for signal output, a four-way transmitter and a host computer for operating and controlling an upper computer. According to the method for simulating the load of the tested air cylinder by applying resistance through the rodless air cylinder, the size of the simulated load is controlled by adjusting the throttling valve of the load air cylinder, the accurate resistance is measured through the force sensor, and the accuracy and consistency of testing are guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of rodless cylinder testing, and in particular relates to a cylinder testing system, method and device using a rodless cylinder equivalent load. Background Art

[0002] At present, the electric-controlled pneumatic sliding plug door is the mainstream door unit of railway passenger cars. The rodless cylinder is an important component of driving the sliding plug door, and the leakage, resistance and load capacity of the rodless cylinder are the key parameters to ensure the normal use of the rodless cylinder. At present, the test content of the rodless cylinder usually only tests the leakage and no-load resistance; the traditional rodless cylinder test cannot meet the diversified test needs; The patent with application number CN202121536167.1 discloses a rodless cylinder detection related technology, which can quickly install the magnetic rodless cylinder to the detection device, test the working status of the magnetic rodless cylinder through the electrical control component, realize the rapid detection of the key performance indicators of the magnetic rodless cylinder, and quickly judge the quality of the magnetic rodless cylinder, but its test content is small and still cannot meet the diversified testing needs; In view of the above shortcomings, there is a need for a cylinder testing system, method and device using a rodless cylinder equivalent load, which can perform pressure holding test, resistance test and load test of the rodless cylinder to achieve diversified testing. Summary of the invention

[0003] The object of the present invention is to provide a cylinder testing system, method and device using a rodless cylinder equivalent load, which can perform pressure holding test, resistance test and load test of the rodless cylinder to achieve diversified testing.

[0004] The present invention provides the following technical solutions: A cylinder test system using a rodless cylinder equivalent load comprises a load cylinder, a tested cylinder, a plurality of solenoid valves, a plurality of throttle valves and a plurality of pressure transmitters; The air inlet on the left side of the load cylinder is connected to the air inlet of the solenoid valve Q0.0 and the air outlet of the solenoid valve Q0.1 through a three-way joint. The air outlet of the solenoid valve Q0.0 is connected to the throttle valve, and the air inlet of the solenoid valve Q0.1 is connected to the air outlet of the pressure regulating valve. The air inlet on the right side of the load cylinder is connected to the air inlet of the solenoid valve Q0.4 and the air outlet of the solenoid valve Q0.5 through a three-way connection. The air outlet of the solenoid valve Q0.4 is connected to the throttle valve, and the air inlet of the solenoid valve Q0.5 is connected to the air outlet of the pressure regulating valve. The quick exhaust valve on the left side of the tested cylinder is connected to the outlet of solenoid valve Q0.2 and the inlet of solenoid valve Q0.3 through a three-way joint. The inlet of solenoid valve Q0.2 is connected to the outlet of the pressure regulating valve, and the outlet of solenoid valve Q0.3 is connected to the pressure transmitter. The quick exhaust valve on the right side of the cylinder under test is connected to the outlet of solenoid valve Q0.6 and the inlet of solenoid valve Q0.7 through a three-way joint. The inlet of solenoid valve Q0.6 is connected to the outlet of the pressure regulating valve, and the outlet of solenoid valve Q0.7 is connected to the pressure transmitter. Preferably, the circuit for testing the system includes a main control chip MCU, an optocoupler module for level signal input, a relay module for signal output, a four-way transmitter and a host computer for running and controlling the upper computer.

[0005] Preferably, two ends of the load cylinder are connected with proximity switches I0.0 and I0.4 for sensing the test stroke; Preferably, the transmitter is connected with force sensors L1 and R1 for sensing the magnitude of translational resistance; A cylinder testing method using a rodless cylinder equivalent load is as follows: S1, controlling the load of the rodless cylinder to apply resistance to simulate the load of the tested cylinder; S2, controlling the throttle valve of the load cylinder to control the load size of the simulated tested cylinder; S3, accurately measuring the resistance size of the tested cylinder through a force sensor; and then realizing the pressure holding test, resistance test and load test of the rodless cylinder. The load test method can set the test rounds of the load test through the host computer.

[0006] A cylinder test device using a rodless cylinder equivalent load comprises a test bench, and a load cylinder and a tested cylinder arranged on the test bench; a sliding plate of the load cylinder is connected to a sliding plate of the tested cylinder via a connecting piece; and the connecting piece is provided with a force sensing device; and further comprises a control module for controlling and adjusting the load cylinder and the tested cylinder, a signal acquisition module for transmitting test data, and a display screen for displaying; Preferably, a pair of vertical columns and a support beam are provided on the test bench; the lower end of the column is connected to the test bench, and the two ends of the support beam are respectively connected to the side of the column; the cylinder to be tested is arranged on the support beam; the two ends of the load cylinder are connected to the side of the column; and the plane where the sliding plate of the load cylinder and the sliding plate of the cylinder to be tested are located is perpendicular to each other; Preferably, the connecting member includes a tested cylinder connecting member and a load cylinder connecting member with a convex cross-section; the lower end of the tested cylinder connecting member is connected to the sliding plate of the tested cylinder; force sensors are respectively provided on both sides of the tested cylinder connecting member; one end of the load cylinder connecting member is connected to the sliding plate of the load cylinder, and the other end of the load cylinder connecting member is clamped on both sides of the force sensor.

[0007] Preferably, a pair of fixing plates with a right-angled cross section are provided on the support beam, and strip holes are provided on the fixing plates, and the fixing plates are threadedly connected to the support beam through the strip holes; the cylinder to be tested is clamped and fixed between the two fixing plates; Preferably, it also includes several triangular support frames; the lower sides of both ends of the load cylinder are connected to the column through the triangular support frames; the lower sides of both ends of the support beam are connected to the column through the triangular support frames; the lower end of the column is connected to the test bench through the triangular support frames; proximity switches for sensing the stroke are provided at both ends of the load cylinder; and both the load cylinder and the cylinder under test are provided with quick exhaust valves.

[0008] Beneficial effects of the present invention: The present invention uses a rodless cylinder to apply resistance to simulate the load of the cylinder under test, controls the size of the simulated load by adjusting the throttle valve of the load cylinder, and measures the precise size of the resistance through a force sensor to ensure the accuracy and consistency of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 Schematic diagram of the air circuit unit required for the equivalent load of the rodless cylinder; Figure 2 Schematic diagram of the circuit units required for the rodless cylinder equivalent load; Figure 3 A third embodiment diagram of the air circuit unit required for the equivalent load of the rodless cylinder; Figure 4 A third embodiment diagram of the circuit unit required for the rodless cylinder equivalent load; Figure 5 This is the front view of the test device; Figure 6 This is the axial view of the test device; Figure 7 This is the structural diagram of the connector of the test device. DETAILED DESCRIPTION Example

[0010] like Figures 5 to 7 , a cylinder test device using a rodless cylinder equivalent load, comprising a test bench 22, and a load cylinder 3 and a tested cylinder 4 arranged on the test bench 22; the sliding plate of the load cylinder 3 is connected to the sliding plate of the tested cylinder 4 through a connecting member 1; and the connecting member 1 is provided with a force sensing device 21 for sensing the load force; in order to facilitate fixed connection, the connecting member 1 comprises a tested cylinder connecting member 1b and a load cylinder connecting member 1a having a convex cross-section; The lower end of the tested cylinder connecting member 1b is threadedly connected to the sliding plate of the tested cylinder 4 for easy disassembly and assembly; force sensors 21 are respectively provided on both sides of the tested cylinder connecting member 1b for sensing the resistance of the reciprocating translation of the tested cylinder 4; one end of the load cylinder connecting member 1a is threadedly connected to the sliding plate of the load cylinder 3 for easy disassembly and assembly; the other end of the load cylinder connecting member 1a is clamped on both sides of the force sensor 21. For the specific structure, see the attached Figure 3 ; In order to facilitate fixed connection, a pair of vertical columns 18 and a support beam 23 are provided on the test bench 22; the lower end of the column 18 is connected to the test bench 22, and the two ends of the support beam 23 are respectively connected to the side of the column 18; and the cylinder 4 to be tested is arranged on the support beam 23; the two ends of the load cylinder 3 are connected to the side of the column 18; and the planes where the sliding plates of the load cylinder 3 and the sliding plates of the cylinder 4 to be tested are located are perpendicular to each other, so as to ensure that the load cylinder 3 and the cylinder 4 to be tested are conveniently connected through the connecting piece 1; In order to facilitate disassembly and fixation, a pair of fixing plates 19 with a right-angled cross section are provided on the support beam 23, and strip holes are provided on the fixing plates 19. The fixing plates 19 are threadedly connected to the support beam 23 through the strip holes. By changing the position of the bolts in the strip holes of the fixing plates 19, the distance between the two fixing plates 19 can be changed; and the cylinder 4 to be tested is clamped and fixed between the two fixing plates 19; wherein, the lower sides of both ends of the load cylinder 3 are connected to the column 18 through the triangular support frame 20; the lower sides of both ends of the support beam 23 are connected to the column 18 through the triangular support frame 20; the lower side of the column 18 is connected to the test bench 22 through the triangular support frame 20; proximity switches for sensing the stroke are provided at both ends of the load cylinder 3 to ensure that the stroke test is completed; the load cylinder 3 and the cylinder 4 to be tested are both provided with quick exhaust valves 2. In order to facilitate control, it also includes a control module for controlling and adjusting the load cylinder 3 and the cylinder 4 to be tested, a signal acquisition module for transmitting test data, and a display screen 5 for display; The lower part of the test bench is provided with circuits and electronic control modules, including MCU6, optical coupling module 7, relay module 8, terminal block 9, 220V to 24V power supply 10, 24V to 5V power supply 11, four-way transmitter 12, air switch 13, socket strip 14, solenoid valve 15, pressure transmitter with display 16 and computer host 17. Through the above synergistic effect, a method of using a rodless cylinder to apply resistance to simulate the load of the cylinder under test is realized, the size of the simulated load is controlled by adjusting the throttle valve of the load cylinder, and the precise size of the resistance is measured by the force sensor to ensure the accuracy and consistency of the test; Example

[0011] like Figure 1 to Figure 2, a cylinder testing method and system using a rodless cylinder equivalent load; a circuit unit, including a main control chip MCU, a level signal input optocoupler module, a signal output relay module, a pressure transmitter, a force sensor and a host computer for running and controlling the upper computer. The gas circuit unit is composed of a number of solenoid valves, a throttle valve and a pressure transmitter. The air inlet on the left side of the load cylinder is connected to the air inlet of the solenoid valve Q0.0 and the air outlet of the solenoid valve Q0.1 through a three-way joint, wherein the air outlet of the solenoid valve Q0.0 is connected to the throttle valve, and the air inlet of the solenoid valve Q0.1 is connected to the air outlet of the pressure regulating valve. The air inlet on the right side of the load cylinder is connected to the air inlet of the solenoid valve Q0.4 and the air outlet of the solenoid valve Q0.5 through a three-way joint, wherein the air outlet of the solenoid valve Q0.4 is connected to the throttle valve, and the air inlet of the solenoid valve Q0.5 is connected to the air outlet of the pressure regulating valve. The quick exhaust valve on the left side of the cylinder under test is connected to the outlet of the solenoid valve Q0.2 and the inlet of the solenoid valve Q0.3 through a three-way joint, where the inlet of the solenoid valve Q0.2 is connected to the outlet of the pressure regulating valve, and the outlet of the solenoid valve Q0.3 is connected to the pressure transmitter. The quick exhaust valve on the right side of the cylinder under test is connected to the outlet of the solenoid valve Q0.6 and the inlet of the solenoid valve Q0.7 through a three-way joint, where the inlet of the solenoid valve Q0.6 is connected to the outlet of the pressure regulating valve, and the outlet of the solenoid valve Q0.7 is connected to the pressure transmitter.

[0012] The input air pressure is regulated by a precision pressure regulating valve. The thrust of the cylinder under test can be controlled by adjusting the air intake of the pressure regulating valve. The function of the pressure transmitter is to monitor the air pressure of the cylinder under test in real time. By switching the solenoid valve Q0.3 and the solenoid valve Q0.7, a pressure transmitter can be used to monitor the air pressure at both ends of the cylinder under test.

[0013] The upper strip groove on the left side of the load cylinder is equipped with a proximity switch I0.0, and the upper strip groove on the right side is equipped with a proximity switch I0.4. The slider of the load cylinder is connected to the magnetic ring inside the cylinder. When the slider moves to the leftmost side of the load cylinder, the magnetic ring inside the cylinder triggers the proximity switch I0.0. When the slider moves to the rightmost side of the load cylinder, the magnetic ring inside the cylinder triggers the proximity switch I0.4. By detecting the state of the proximity switch, the position information of the tested cylinder and the load cylinder slider can be determined during the test. A fixed bracket is installed on the load cylinder slider, and force sensors L1 and R1 are installed on both sides of the fixed bracket respectively. A stopper is installed on the slider of the tested cylinder, and the stopper is located in the middle of force sensors L1 and R1. The real-time thrust of the tested cylinder can be measured by the above-mentioned force sensor.

[0014] The load resistance simulated by the load cylinder can be adjusted by controlling the on and off of the solenoid valve and monitoring the value of the force sensor. Open the solenoid valves Q0.0, Q0.2, Q0.3, and Q0.4 in the air circuit unit, and the slider of the cylinder under test begins to move from left to right. The block installed on the slider of the cylinder under test passes through the fixed bracket installed on the slider of the load cylinder, and the force sensor R1 measures the resistance of the load from left to right at this time. At this time, the throttle valve of the solenoid valve Q0.4 on the right side of the load cylinder controls the air output of the load cylinder to adjust the resistance of the load cylinder from left to right, and the value fed back by the force sensor R1 accurately adjusts the resistance of the load cylinder from left to right; in this way Push, when the solenoid valves Q0.0, Q0.6, Q0.7 and Q0.4 in the air circuit unit are opened, the slider of the tested cylinder starts to move from right to left, and the block installed on the slider of the tested cylinder passes through the fixed bracket installed on the slider of the load cylinder, and the force sensor R1 measures the resistance of the load from right to left at this time. At this time, the throttle valve of the solenoid valve Q0.4 on the right side of the load cylinder is used to control the air outlet of the load cylinder to adjust the resistance of the load cylinder from right to left, and the value fed back by the force sensor R1 is used to accurately adjust the resistance of the load cylinder from right to left.

[0015] After the load test begins, the solenoid valves Q0.0, Q0.2, Q0.3, and Q0.4 in the gas circuit unit are opened. If the load capacity of the cylinder under test is normal, the cylinder under test will push the load cylinder from left to right. When the magnetic ring in the load cylinder reaches the proximity switch I0.4 installed on the right side of the rodless cylinder, the left-to-right load test of the cylinder under test is completed, and all solenoid valves are closed. Next, the right-to-left load test of the cylinder under test begins. The solenoid valves Q0.0, Q0.6, Q0.7, and Q0.4 in the gas circuit unit are opened. If the load capacity of the cylinder under test is normal, the cylinder under test will push the load cylinder from right to left. When the magnetic ring in the load cylinder reaches the proximity switch I0.0 installed on the left side of the rodless cylinder, the right-to-left load test of the cylinder under test is completed, and all solenoid valves are closed to complete one round of load testing; The air circuit unit also includes a rodless cylinder pressure test function. After the pressure test begins, the air circuit unit Q0.0, Q0.4, Q0.2, and Q0.3 are opened, and the other solenoid valves are closed. The tested cylinder slider pushes the load cylinder slider to move from left to right. When the proximity switch I0.4 detects the load cylinder magnetic ring, this state is maintained for 10 seconds. After ensuring that the tested cylinder has sufficient air pressure, the solenoid valve Q0.3 is kept open, and the other solenoid valves are closed to start the formal test. After the test time has passed, the leakage on the left side of the tested cylinder is verified by comparing the value of the pressure transmitter at the beginning of the test with the value of the pressure transmitter at the end of the test. The leakage test on the right side of the tested cylinder can be completed by analogy.

[0016] The air circuit unit also includes the function of no-load resistance test for rodless cylinders. After the no-load resistance test begins, the air circuit unit Q0.1 and Q0.4 are opened, and the other solenoid valves are closed. The load cylinder slider pushes the slider of the tested cylinder to move from left to right. By adjusting the throttle valve on the right side of the load cylinder, the load cylinder can be controlled to drive the tested cylinder to move at a uniform speed. At this time, by checking the value of force sensor R1, the no-load resistance of the tested cylinder can be obtained. By analogy, the no-load resistance test on the right side of the tested cylinder can be completed. Example

[0017] like Figure 3 and Figure 4 As shown, the difference from Example 1 is that this embodiment can perform two-way tests at the same time, and can realize the simultaneous testing of multiple rodless cylinders, thereby improving the test efficiency; the second test process is as follows: the air inlet on the left side of the load cylinder is connected to the air inlet of the solenoid valve Q1.0 and the air outlet of the solenoid valve Q1.1 through a three-way joint, wherein the air outlet of the solenoid valve Q1.0 is connected to the throttle valve, and the air inlet of the solenoid valve Q1.1 is connected to the air outlet of the pressure regulating valve. The air inlet on the right side of the load cylinder is connected to the air inlet of the solenoid valve Q1.4 and the air outlet of the solenoid valve Q1.5 through a three-way joint, wherein the air outlet of the solenoid valve Q1.4 is connected to the throttle valve, and the air inlet of the solenoid valve Q1.5 is connected to the air outlet of the pressure regulating valve. The quick exhaust valve on the left side of the tested cylinder is connected to the air outlet of the solenoid valve Q1.2 and the air inlet of the solenoid valve Q1.3 through a three-way joint, wherein the air inlet of the solenoid valve Q1.2 is connected to the air outlet of the pressure regulating valve, and the air outlet of the solenoid valve Q1.3 is connected to the pressure transmitter. The quick exhaust valve on the right side of the tested cylinder is connected to the outlet of solenoid valve Q1.6 and the inlet of solenoid valve Q1.7 through a three-way joint. The inlet of solenoid valve Q1.6 is connected to the outlet of the pressure regulating valve, and the outlet of solenoid valve Q1.7 is connected to the pressure transmitter.

[0018] The input air pressure is regulated by a precision pressure regulating valve. The thrust of the cylinder under test can be controlled by adjusting the air intake of the pressure regulating valve. The function of the pressure transmitter is to monitor the air pressure of the cylinder under test in real time. By switching the solenoid valve Q1.3 and the solenoid valve Q1.7, a pressure transmitter can be used to monitor the air pressure at both ends of the cylinder under test.

[0019] A proximity switch I0.5 is installed on the upper strip groove on the left side of the load cylinder, and a proximity switch I0.4 is installed on the upper strip groove on the right side. The slider of the load cylinder is connected to the magnetic ring inside the cylinder. When the slider moves to the leftmost side of the load cylinder, the magnetic ring in the cylinder triggers the proximity switch I0.5, and when the slider moves to the rightmost side of the load cylinder, the magnetic ring in the cylinder triggers the proximity switch I0.4. By detecting the state of the proximity switch, the position information of the tested cylinder and the load cylinder slider can be determined during the test. A fixed bracket is installed on the load cylinder slider, and force sensors L2 and R2 are installed on both sides of the fixed bracket respectively. A block is installed on the tested cylinder slider, and the block is located in the middle of force sensors L2 and R2. The real-time thrust size of the tested cylinder can be measured through the above-mentioned force sensor.

[0020] The load resistance simulated by the load cylinder can be adjusted by controlling the on and off of the solenoid valve and monitoring the value of the force sensor. Open the solenoid valves Q1.0, Q1.2, Q1.3, and Q1.4 in the air circuit unit, and the slider of the cylinder under test begins to move from left to right. The block installed on the slider of the cylinder under test passes through the fixed bracket installed on the slider of the load cylinder, and the force sensor R2 measures the resistance of the load from left to right at this time. At this time, the throttle valve of the solenoid valve Q1.4 on the right side of the load cylinder controls the air output of the load cylinder to adjust the resistance of the load cylinder from left to right, and the value fed back by the force sensor R2 accurately adjusts the resistance of the load cylinder from left to right; in this way Push, when the solenoid valves Q1.0, Q1.6, Q1.7 and Q1.4 in the air circuit unit are opened, the slider of the tested cylinder starts to move from right to left, and the block installed on the slider of the tested cylinder passes through the fixed bracket installed on the slider of the load cylinder, and the force sensor R2 measures the resistance of the load from right to left at this time. At this time, the throttle valve of the solenoid valve Q1.4 on the right side of the load cylinder is used to control the air outlet of the load cylinder to adjust the resistance of the load cylinder from right to left, and the value fed back by the force sensor R2 is used to accurately adjust the resistance of the load cylinder from right to left.

[0021] After the load test begins, the solenoid valves Q1.0, Q1.2, Q1.3, and Q1.4 in the gas circuit unit are opened. If the load capacity of the cylinder under test is normal, the cylinder under test will push the load cylinder from left to right. When the magnetic ring in the load cylinder reaches the proximity switch I0.4 installed on the right side of the rodless cylinder, the left-to-right load test of the cylinder under test is completed, and all solenoid valves are closed. Next, the right-to-left load test of the cylinder under test begins. The solenoid valves Q1.0, Q1.6, Q1.7, and Q1.4 in the gas circuit unit are opened. If the load capacity of the cylinder under test is normal, the cylinder under test will push the load cylinder from right to left. When the magnetic ring in the load cylinder reaches the proximity switch I0.5 installed on the left side of the rodless cylinder, the right-to-left load test of the cylinder under test is completed, and all solenoid valves are closed to complete one round of load testing; The air circuit unit also includes a rodless cylinder pressure test function. After the pressure test begins, the air circuit unit Q1.0, Q1.4, Q1.2, and Q1.3 are opened, and the other solenoid valves are closed. The tested cylinder slider pushes the load cylinder slider to move from left to right. When the proximity switch I0.4 detects the load cylinder magnetic ring, this state is maintained for 10 seconds. After ensuring that the tested cylinder has sufficient air pressure, the solenoid valve Q1.3 is kept open, and the other solenoid valves are closed to start the formal test. After the test time has passed, the leakage on the left side of the tested cylinder is verified by comparing the value of the pressure transmitter at the beginning of the test with the value of the pressure transmitter at the end of the test. The leakage test on the right side of the tested cylinder can be completed by analogy.

[0022] The air circuit unit also includes the function of testing the no-load resistance of the rodless cylinder. After the no-load resistance test begins, the air circuit unit Q1.1 and Q1.4 are opened, and the other solenoid valves are closed. The load cylinder slider pushes the slider of the tested cylinder to move from left to right. By adjusting the throttle valve on the right side of the load cylinder, the load cylinder can be controlled to drive the tested cylinder to move at a constant speed. At this time, by checking the value of the force sensor R2, the no-load resistance of the tested cylinder can be obtained. By analogy, the no-load resistance test on the right side of the tested cylinder can be completed. The load test method can set the test rounds of the load test through the host computer.

[0023] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cylinder testing system using a rodless cylinder equivalent load, characterized in that: It includes a load cylinder, a cylinder to be tested, a plurality of solenoid valves, a plurality of throttle valves and a plurality of pressure transmitters; The air inlet on the left side of the load cylinder is connected to the air inlet of the solenoid valve Q0.0 and the air outlet of the solenoid valve Q0.1 through a three-way joint. The air outlet of the solenoid valve Q0.0 is connected to the throttle valve, and the air inlet of the solenoid valve Q0.1 is connected to the air outlet of the pressure regulating valve. The air inlet on the right side of the load cylinder is connected to the air inlet of the solenoid valve Q0.4 and the air outlet of the solenoid valve Q0.5 through a three-way connection. The air outlet of the solenoid valve Q0.4 is connected to the throttle valve, and the air inlet of the solenoid valve Q0.5 is connected to the air outlet of the pressure regulating valve. The quick exhaust valve on the left side of the tested cylinder is connected to the outlet of solenoid valve Q0.2 and the inlet of solenoid valve Q0.3 through a three-way joint. The inlet of solenoid valve Q0.2 is connected to the outlet of the pressure regulating valve, and the outlet of solenoid valve Q0.3 is connected to the pressure transmitter. The quick exhaust valve on the right side of the tested cylinder is connected to the outlet of solenoid valve Q0.6 and the inlet of solenoid valve Q0.7 through a three-way joint. The inlet of solenoid valve Q0.6 is connected to the outlet of the pressure regulating valve, and the outlet of solenoid valve Q0.7 is connected to the pressure transmitter.

2. A cylinder testing system using a rodless cylinder equivalent load according to claim 1, characterized in that: The circuit used for testing the system includes a main control chip MCU, an optocoupler module for level signal input, a relay module for signal output, a four-channel transmitter and a host computer for running and controlling the upper computer.

3. A cylinder testing system using a rodless cylinder equivalent load according to claim 1, characterized in that: Both ends of the load cylinder are connected with proximity switches I0.0 and I0.4 for sensing the test stroke; the transmitter is connected with force sensors L1 and R1 for sensing the magnitude of translational resistance.

4. According to claim 1, a cylinder testing system using a rodless cylinder equivalent load, and its testing method is as follows: S1, controlling the load of the rodless cylinder to apply resistance to simulate the load of the tested cylinder; S2, controlling and adjusting the throttle valve of the load cylinder to control the load size of the simulated tested cylinder; S3, accurately measuring the resistance size of the tested cylinder through a force sensor; thereby realizing the pressure holding test, resistance test and load test of the rodless cylinder; the load testing method can set the test rounds of the load test through the host computer.

5. A cylinder testing method using rodless cylinder equivalent load according to claim 4, wherein the testing device is characterized in that: It includes a test bench, and a load cylinder and a tested cylinder arranged on the test bench; The sliding plate of the load cylinder is connected to the sliding plate of the tested cylinder through a connecting piece; and the connecting piece is provided with a force sensing device; It also includes a control module for controlling and adjusting the load cylinder and the tested cylinder, a signal acquisition module for transmitting test data, and a display screen for displaying.

6. A cylinder testing system using a rodless cylinder equivalent load according to claim 5, characterized in that: A pair of vertical columns and support beams are provided on the test bench; the lower end of the column is connected to the test bench, and the two ends of the support beam are respectively connected to the side of the column; The cylinder to be tested is arranged on the support beam; the two ends of the load cylinder are connected to the side of the column; The planes where the sliding plate of the load cylinder and the sliding plate of the tested cylinder are located are perpendicular to each other.

7. The cylinder testing device using rodless cylinder equivalent load according to claim 6, characterized in that: The connecting parts include a tested cylinder connecting part and a load cylinder connecting part with a convex cross section; The lower end of the tested cylinder connecting piece is connected to the sliding plate of the tested cylinder; force sensors are respectively provided on both sides of the tested cylinder connecting piece; One end of the load cylinder connecting piece is connected to the sliding plate of the load cylinder, and the other end of the load cylinder connecting piece is clamped on both sides of the force sensor.

8. The cylinder testing device using rodless cylinder equivalent load according to claim 7, characterized in that: A pair of fixing plates with right-angled cross sections are arranged on the supporting beam, strip holes are arranged on the fixing plates, and the fixing plates are threadedly connected to the supporting beam through the strip holes; the cylinder to be tested is clamped and fixed between the two fixing plates.

9. A cylinder testing device using a rodless cylinder equivalent load according to claim 8, further comprising a plurality of triangular support frames; the lower sides of both ends of the load cylinder are connected to the columns through the triangular support frames.

10. The cylinder testing device using rodless cylinder equivalent load according to claim 9, characterized in that: The lower sides of both ends of the support beam are connected to the column through a triangular support frame; the lower end of the column is connected to the test bench through a triangular support frame; proximity switches for sensing the stroke are provided at both ends of the load cylinder; and both the load cylinder and the cylinder being tested are provided with quick exhaust valves.

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