Cylinder load testing device

Abstract

The utility model relates to the technical field of executing mechanism performance testing, in particular to a cylinder load testing device, which comprises an executing mechanism, a load mechanism and a middle connecting structure, the executing mechanism comprises an executing air cylinder and a first air cylinder control circuit used for controlling air inlet and air exhaust of the executing air cylinder, the load mechanism comprises a load cylinder and a second cylinder control circuit used for controlling air intake and air exhaust of the load cylinder which are connected in sequence; the middle connecting structure is used for connecting the executing mechanism and the load mechanism, and the executing air cylinder and the load air cylinder are arranged on the two sides of the middle connecting structure and both face the middle connecting structure; the execution air cylinder and the load air cylinder are connected through the middle connecting structure, and opposite pulling and opposite pushing movement of the execution air cylinder and the load air cylinder is achieved. Compared with the prior art, the load test is carried out by applying different pressures to the execution cylinder and the load cylinder to form a pressure difference, so that the time for reassembling the device is reduced to a great extent, and the efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of actuator performance testing, in particular to a cylinder load testing device. Background Art

[0002] The results of the cylinder load performance test are of great significance for the selection, design optimization and fault diagnosis of cylinders. Through the test results, the working ability of the cylinder under different load conditions can be evaluated, providing a basis for selecting a suitable cylinder; at the same time, problems existing in the cylinder design can also be found and improved to improve the performance and reliability of the cylinder. Traditional cylinder testing requires the use of pressure sensors, speedometers, displacement sensors, etc., and it is necessary to ensure that these devices have been calibrated and verified. During the test, factors such as temperature and humidity also need to be controlled, and the measurement results are inaccurate and the reliability is low.

[0003] In the related art, the cylinder is tested by installing a resistance load block at the piston rod of the cylinder. During the test, compressed air with the nominal pressure is alternately introduced into the air ports at both ends of the cylinder to make the cylinder reciprocate along the stroke for more than three times.

[0004] However, the above test method has the problem of high test cost. For different cylinder bores, it is necessary to manufacture corresponding load blocks according to the percentage value of the maximum theoretical output force of the cylinder, and there are many models of the piston rod threads of the same type of cylinder, which results in a large number of load blocks, a long production time, a long time cycle for manual replacement of the load test, and the test must be installed and tested in the laboratory, and cannot be used in multiple scenarios, with low integration. Content of the Utility Model

[0005] In view of at least one of the above technical problems, the utility model provides a cylinder load testing device, which conducts load testing by forming a pressure difference with different pressures applied to the test cylinder and the load cylinder.

[0006] According to the first aspect of the utility model, a cylinder load testing device is provided, including:

[0007] An actuator, the actuator includes an actuator cylinder connected in sequence and a first cylinder control circuit for controlling the intake and exhaust of the actuator cylinder;

[0008] A load mechanism, the load mechanism includes a load cylinder connected in sequence and a second cylinder control circuit for controlling the intake and exhaust of the load cylinder;

[0009] An intermediate connection structure for connecting the actuator and the load mechanism, the actuator cylinder and the load cylinder are arranged on both sides of the intermediate connection structure and both face the intermediate connection structure;

[0010] Wherein, the intermediate connection structure connects the actuating cylinder and the load cylinder, enabling the actuating cylinder and the load cylinder to perform pulling and pushing movements against each other.

[0011] In some embodiments of the present invention, both the first cylinder control circuit and the second cylinder control circuit include two-position five-way solenoid valves. The two-position five-way solenoid valves are connected to the actuating cylinder or the load cylinder and are used to control the intake and exhaust of the actuating cylinder or the load cylinder.

[0012] In some embodiments of the present invention, the cylinder load testing device is connected with a PLC control mechanism and a display module. The PLC control mechanism is connected to the two-position five-way solenoid valve and is used to control the on-off commutation intake of the actuating mechanism and the load mechanism. The display module includes a sensor and a display screen.

[0013] In some embodiments of the present invention, the first cylinder control circuit includes two one-way throttle valves. One end of each one-way throttle valve is respectively connected to the rod chamber and the rodless chamber of the actuating cylinder through a valve joint, and the other end is connected to the two-position five-way solenoid valve. The two-position five-way solenoid valve controls the gas to enter the one-way throttle valves, and then the two one-way throttle valves respectively control the flow rates of the gas entering and leaving the rod chamber and the rodless chamber of the actuating cylinder.

[0014] In some embodiments of the present invention, the second cylinder control circuit includes two precision pressure reducing valves and two overflow valves. The overflow valve and the precision pressure reducing valve are sequentially connected to the rod chamber and the rodless chamber of the load cylinder. The overflow valve and the precision pressure reducing valve are used to adjust the flow rate, pressure, and flow velocity to set values.

[0015] In some embodiments of the present invention, both the actuating mechanism and the load mechanism are connected to a gas supply mechanism. Both the actuating mechanism and the load mechanism include filter pressure reducing valves. The two filter pressure reducing valves are connected to the gas supply mechanism. The gas supply mechanism provides a set flow rate, which flows to the actuating mechanism and the load mechanism, and then enters the actuating cylinder and the load cylinder respectively after being filtered by the two filter pressure reducing valves.

[0016] In some embodiments of the present invention, the intermediate connection structure includes a guide rod, an intermediate bearing sleeved on the guide rod, and an intermediate block sleeved on the intermediate bearing. The intermediate block is fixed through a positioning hole.

[0017] In some embodiments of the present utility model, the intermediate connection structure includes a cylinder bracket for fixing the actuating cylinder on a set plane, and the bottom surface of the intermediate block and the bottom surface of the cylinder bracket are on the same plane. The cylinder bracket includes a plurality of positioning sleeves. Counterbore holes are machined on the bottom surface of the cylinder bracket, both sides of the actuating cylinder and the load cylinder. One end of the positioning sleeve is connected to the side plate of the cylinder bracket, and the other end is connected to the counterbore hole in the actuating cylinder or the load cylinder. One end of the other positioning sleeve is connected to the bottom surface of the cylinder bracket, and the other end is connected to the set plane.

[0018] In some embodiments of the present utility model, a floating joint is sleeved on one side of the cylinder bracket facing the guide rod. The floating joint has a T-shaped groove configured as a through hole. The T-shaped groove is in floating connection with the guide rod, and the diameter of the T-shaped groove is larger than the circumferential diameter of the T-shaped protruding part at one end of the guide rod, and meets the stroke accuracy requirements of the guide rod and the T-shaped groove.

[0019] In some embodiments of the present utility model, the material of the floating joint is 42CrMo, and the material of the guide rod is GCr15 at the same time.

[0020] The beneficial effects of the present utility model are as follows: The present utility model connects the actuating cylinder and the load cylinder together through the intermediate connection structure to realize the pulling and pushing movements of the two groups of cylinders, so as to monitor the load performance of the cylinders, record experimental data, and analyze the data to evaluate the load performance of the cylinders. Compared with the prior art, by applying different pressures to the actuating cylinder and the load cylinder to form a pressure difference for load testing, the time for reinstalling the device is greatly reduced, and the efficiency is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the cylinder load testing device in the embodiment of the present utility model;

[0023] Figure 2 It is a schematic structural diagram of the part above the plane in the cylinder load testing device in the embodiment of the present utility model;

[0024] Figure 3 It is a schematic diagram of the principle of the cylinder load testing device in the embodiment of the present utility model;

[0025] Figure 4 The front view of the part above the plane in the cylinder load testing device in the embodiment of the present utility model;

[0026] Figure 5 In the embodiment of the present utility model Figure 1 The partial enlarged view of the position A;

[0027] Figure 6 The structural schematic diagram of the cylinder bracket in the embodiment of the present utility model;

[0028] Figure 7 The mating diagram of the guide rod and the T-shaped groove in the embodiment of the present utility model. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] As Figures 1 to 7 shown in the cylinder load testing device, including: an actuator 1, a load mechanism 2 and an intermediate connection structure 3;

[0033] As Figure 3As shown in the figure, the actuator 1 includes an actuator cylinder 11 and a first cylinder control circuit 12 that are connected in sequence and used to control the intake and exhaust of the actuator cylinder 11. It should be noted here that the first cylinder control circuit 12 controls the intake and exhaust of both the rodless chamber and the rod chamber of the actuator cylinder 11 at the same time. The specific intake and exhaust processes are as follows: Compressed air is input into the rodless chamber, and the rod chamber exhausts. The force formed by the pressure difference between the two chambers of the actuator cylinder 11 acting on the piston pushes the piston to move, causing the piston rod to extend. When the rod chamber intakes air and the rodless chamber exhausts air, the piston rod retracts. By alternately intaking and exhausting air in the rod chamber and the rodless chamber, the piston can perform reciprocating linear motion.

[0034] The load mechanism 2 includes a load cylinder 21 and a second cylinder control circuit 22 that are connected in sequence and used to control the intake and exhaust of the load cylinder 21. The operating principle of the load cylinder 21 is the same as that of the actuator cylinder 11, and the intake and exhaust of the rodless chamber and the rod chamber are controlled by the second cylinder control circuit 22.

[0035] The intermediate connection structure 3 is used to connect the actuator 1 and the load mechanism 2. The actuator cylinder 11 and the load cylinder 21 are arranged on both sides of the intermediate connection structure 3 and are both oriented towards the intermediate connection structure 3. The intermediate connection structure 3 is responsible for transmitting the loads between the actuator 1 and the load mechanism 2. Therefore, the design of the intermediate connection structure 3 needs to consider transmission efficiency, stability, durability, etc. The material of the intermediate connection structure 3 should be selected from materials with sufficient strength, such as aluminum alloy, alloy steel and other materials.

[0036] Among them, the intermediate connection structure 3 connects the actuating cylinder 11 and the load cylinder 21, enabling the actuating cylinder 11 and the load cylinder 21 to perform pulling and pushing movements against each other. The specific processes of pulling and pushing movements against each other are as follows. The first cylinder control line 12 and the second cylinder control line 22 respectively control the intake and exhaust of the rod chamber and the rodless chamber of the actuating cylinder 11 and the load cylinder 21. First, the first cylinder control line 12 and the second cylinder control line 22 are supplied with air source, and processes such as controlling the air pressure, filtering, and pressure reduction are carried out to accurately control the intake air volume, exhaust air volume, and operating speed, improving the accuracy of measuring the cylinder load of the device. Then, the air flow enters the rodless chamber of the actuating cylinder 11 through control, and the piston of the actuating cylinder 11 moves towards the load cylinder 21. After the air flow passes through, the second cylinder control line 22 controls the intake of the rodless chamber of the load cylinder 21, and the actuating cylinder 11 and the load cylinder 21 perform a butting movement. For example, by applying a greater pressure to the actuating cylinder 11 than to the load cylinder 21 to form a pressure difference, the movement direction of the device will be towards the direction with greater pressure, and the load cylinder 21 provides resistance, thereby testing the load cylinder 21 of the actuating cylinder 11. It should also be noted here that it is also possible to have the air intake at the rod chamber ends of the actuating cylinder 11 and the load cylinder 21, and the two cylinders perform a pulling movement against each other, thereby conducting a load test on the actuating cylinder 11. By controlling the intake and exhaust of the rod chambers or rodless chambers of the actuating cylinder 11 and the load cylinder 21, the device can be made to move towards the direction with greater pressure, thus forming a reciprocating movement. Compared with the prior art, by applying different pressures to the actuating cylinder 11 and the load cylinder 21 to form a pressure difference for load testing, the time for reinstalling the device is greatly reduced, effectively improving the efficiency. The intermediate connection structure 3 is detachable from the actuating mechanism 1 and the load mechanism 2, so it can be applicable to cylinders of different models and different cylinder diameters, with more applicable scenarios. And because the parts are detachable, all parts can be detachably replaced, and the maintenance cost is relatively low. As Figure 1 shown in, the actuating mechanism 1, the load mechanism 2, and the intermediate connection structure 3 can be fixed on the tabletop, and then the movement of the device can be realized through universal wheels. It can also be connected to some tabletops as needed. Through such a setting, the applicable scenarios of the device are wider.

[0037] In some embodiments of the present invention, as Figure 3 shown in, both the first cylinder control line 12 and the second cylinder control line 22 include a two-position five-way solenoid valve 01. The two-position five-way solenoid valve 01 is connected to the actuating cylinder 11 or the load cylinder 21 for controlling the intake and exhaust of the actuating cylinder 11 or the load cylinder 21. The two-position five-way solenoid valve 01 has five air pipe interfaces and can be flexibly connected to different air paths as needed. Through the two-position five-way solenoid valve 01, it is possible to more simply control the intake and exhaust of the rod chamber and the rodless chamber of the load cylinder 21 and the actuating cylinder 11, as well as the flow direction and flow rate of the gas.

[0038] In some embodiments of the present utility model, in order to control the air circuit more quickly, the cylinder load testing device is connected with a PLC control mechanism and a display module. The PLC control mechanism is connected to a five-port two-position solenoid valve 01 and is used to control the on-off and commutation of air intake of the actuator 1 and the load mechanism 2. The display module includes a sensor and a display screen. The PLC control mechanism is connected to the five-port two-position solenoid valve 01 to achieve precise control of the five-port two-position solenoid valve 01, which can control the gas flow direction and flow rate, and can be programmed flexibly to meet complex and changeable test requirements. The sensor is set to monitor various parameters in real time during the load test of the actuator cylinder 11, such as pressure, temperature, displacement, etc., and converts the parameters into electrical signals and transmits them to the PLC control mechanism. The display screen is used to display the data collected by the sensor and the results processed by the PLC control mechanism, facilitating the operator to understand the test status and adjust the working state of the device in a timely manner.

[0039] In some embodiments of the present utility model, such as Figure 2 and Figure 3 shown in, the first cylinder control circuit 12 includes two one-way throttle valves 12a. One end of the one-way throttle valve 12a is respectively connected to the rod chamber and the rodless chamber of the actuator cylinder 11 through a valve joint 12b, and the other end is connected to the five-port two-position solenoid valve 01. The five-port two-position solenoid valve 01 controls the gas to enter the one-way throttle valve 12a, and then the two one-way throttle valves 12a respectively control the flow rate of the gas entering and leaving the rod chamber and the rodless chamber of the actuator cylinder 11. By setting the one-way throttle valve 12a, the gas can only pass freely in one direction, and the flow rate is restricted in the opposite direction, that is, by adjusting the opening degree of the one-way throttle valve 12a to control the gas flow rate entering the rod chamber and the rodless chamber of the actuator cylinder 11. The valve joint 12b is used to connect the one-way throttle valve 12a and the actuator cylinder 11 to ensure that the gas can flow smoothly into the corresponding chamber of the cylinder to prevent gas leakage from affecting the test effect.

[0040] In some embodiments of the present utility model, such as Figure 3As shown in the figure, the second cylinder control circuit 22 includes two precision pressure reducing valves 22a and two overflow valves 22b. The rod chamber and the rodless chamber of the load cylinder 21 are successively connected with an overflow valve 22b and a precision pressure reducing valve 22a. The overflow valve 22b and the precision pressure reducing valve 22a are used to adjust the flow rate, pressure and flow velocity to the set values. The precision pressure reducing valve 22a can reduce the high-pressure gas to the set low-pressure value and maintain a stable output of this pressure; the overflow valve 22b is used to protect the load mechanism 2 from excessive pressure; when the pressure in the load mechanism 2 exceeds the set value of the overflow valve 22b, the overflow valve 22b will open, allowing the excess gas to flow out, thus preventing damage caused by excessive pressure in the load mechanism 2. Through such a setting, when the gas is connected, in some cases, for example, when the supply pressure suddenly increases, resulting in an abnormal increase in the pressure in the load mechanism 2, the overflow valve 22b responds first to protect components such as the load cylinder 21 from damage. After being protected by the overflow valve 22b, the gas is then precisely pressure-regulated by the precision pressure reducing valve 22a. In this way, even if the overflow valve 22b malfunctions, the precision pressure reducing valve 22a can ensure that the pressure is stable at the preset value, thus achieving precise control while ensuring safety.

[0041] In some embodiments of the present invention, as Figure 3 shown in the figure, the actuator 1 and the load mechanism 2 are both connected to the air supply mechanism 4. The actuator 1 and the load mechanism 2 both include filter pressure reducing valves 02. The two filter pressure reducing valves 02 are connected to the air supply mechanism 4. The air supply mechanism 4 provides a set flow rate, which flows to the actuator 1 and the load mechanism 2, and then enters the actuator cylinder 11 and the load cylinder 21 after being filtered by the two filter pressure reducing valves 02 respectively. The output end of the air supply mechanism 4 is connected to the inlets of the two filter pressure reducing valves 02 through pipelines, while the outlets of the filter pressure reducing valves 02 are respectively connected to the air inlet ends of the actuator 1 and the load mechanism 2. The filter pressure reducing valve 02 can ensure the cleanliness and pressure stability of the air source, thereby improving the operation stability of the entire system. By removing impurities in the compressed air and adjusting the pressure to the appropriate range, damage to the actuator components and the load mechanism 2 can be reduced, and the reliability and service life of the system can be improved. The filter pressure reducing valve 02 also has an adjustable pressure range and can be flexibly set according to different working requirements to meet diverse application scenarios; it should be noted here that the filter pressure reducing valve 02 can be a pressure reducing valve in the form of a triple combination, that is, an air filter, a pressure reducing valve and an oiler are assembled together, or it can also be in the form of a double combination, combining the air filter and the pressure reducing valve. The specific structural form is set by those skilled in the art according to requirements; it should also be noted here that the filter and other components and the pressure reducing valve can be separately arranged as independent components and connected together through pipelines or joints for easy separate replacement of components, or the filter and other components and the pressure reducing valve can be designed as an integral unit, which is compact in structure, convenient for installation, and has better integration and sealing performance.

[0042] In some embodiments of the present utility model, as Figures 1 - 2 shown in FIGS. 3 and 4, the intermediate connection structure 3 includes a guide rod 31, an intermediate bearing 32 sleeved on the guide rod 31, and an intermediate block 33 sleeved on the intermediate bearing 32. The intermediate block 33 is fixed through a positioning hole 33a. The device requires relatively high precision during use. Poor precision will cause the transmission parts of the device's load mechanism 2 and the actuator 1, such as between the load cylinder 21 and the actuator cylinder 11, to be unable to be coaxial, and it is easy to get stuck. By setting the linear bearing, the structure can be made smoother, and the guide rod 31 can be supported to ensure precision. Compared with the prior art, the side load force of the guide rod 31 can be reduced, and by fixing the linear bearing through the intermediate block 33 and the intermediate block 33 through the positioning hole 33a, the installation precision can be guaranteed, thereby ensuring the transmission precision.

[0043] To further ensure the coaxiality of the structures of the actuator cylinder 11, the load cylinder 21, and the guide rod 31, in some embodiments of the present utility model, as Figure 2 shown in FIGS. 4 5 and 6, the intermediate connection structure 3 includes a cylinder bracket 34. The cylinder bracket 34 is used to fix the actuator cylinder 11 on a set plane, and the bottom surface of the intermediate block 33 and the bottom surface of the cylinder bracket 34 are located on the same plane. The cylinder bracket 34 includes a plurality of positioning sleeves 34a. Counterbore holes are machined on the bottom surface of the cylinder bracket 34, both side surfaces of the actuator cylinder 11 and the load cylinder 21. One end of the positioning sleeve 34a is connected to the side plate of the cylinder bracket 34, and the other end is connected to the counterbore hole in the actuator cylinder 11 or the load cylinder 21. The other positioning sleeve 34a has one end connected to the bottom surface of the cylinder bracket 34 and the other end connected to the set plane. It should be noted here that the positioning sleeve 34a connects the bottom surface of the cylinder bracket 34 to a plane, and this plane can be any stable basic structure, such as a machine base, a workbench, or other support surfaces. This plane can move, improving the flexibility and adaptability of the device; and since both ends of the positioning sleeve 34a are connected to different parts, it is more convenient to replace the parts.

[0044] In some embodiments of the present utility model, as Figure 4 shown in FIGS. Figure 7As shown in the figure, a floating joint 34b is sleeved on one side of the cylinder bracket 34 facing the guide rod 31. The floating joint 34b has a T-shaped groove 34b1, which is configured as a through hole. The T-shaped groove 34b1 is floatingly connected to the guide rod 31, and the T-shaped groove 34b1 is larger than the circumferential diameter of the T-shaped protruding part at one end of the guide rod 31 and meets the stroke accuracy requirements of the guide rod 31 and the T-shaped groove 34b1. The T-shaped groove 34b1 is larger than the circumferential diameter of the front section of the guide rod 31 by a set length, so that its movement has floating properties, and the guide rod 31 can have a certain degree of freedom in the T-shaped groove 34b1; the T-shaped groove 34b1 is designed as a through hole, which is more convenient for installation. There is a linear bearing support in the middle of the guide rod 31, and the through hole can float up and down. The advantage of the floating connection is that it can absorb small deviations caused by manufacturing tolerances, installation errors or mechanical vibrations. This connection method reduces the stress and wear caused by rigid connection and improves the reliability and life of the system.

[0045] Since the T-shaped groove 34b1 will bear a large impact force, it is necessary to select a material with sufficient strength. In some embodiments of the present invention, the material of the floating joint 34b is 42CrMo, and at the same time, the material of the guide rod 31 is GCr15. 42CrMo has the characteristics of high strength, high hardenability, high toughness, excellent wear resistance and fatigue resistance. GCr15 is a high-carbon chromium bearing steel. After quenching and tempering, it has high hardness, uniform structure, good wear resistance, high contact fatigue strength, good dimensional stability and corrosion resistance. It not only considers the strength and toughness requirements of the T-shaped groove 34b1 when bearing the impact force, but also takes into account the wear resistance and fatigue resistance of the guide rod 31 during the relative movement process, which helps to improve the stability and reliability of the entire device and extend its service life.

[0046] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cylinder load testing device, characterized in that, Comprising: An actuator, the actuator includes an actuating cylinder connected in sequence and a first cylinder control circuit for controlling the intake and exhaust of the actuating cylinder; A load mechanism, the load mechanism includes a load cylinder connected in sequence and a second cylinder control circuit for controlling the intake and exhaust of the load cylinder; An intermediate connection structure for connecting the actuator and the load mechanism, the actuating cylinder and the load cylinder are arranged on both sides of the intermediate connection structure and are both arranged towards the intermediate connection structure; Wherein, the intermediate connection structure connects the actuating cylinder and the load cylinder to realize the pulling and pushing movements between the actuating cylinder and the load cylinder.

2. The cylinder load testing device according to claim 1, wherein Both the first cylinder control circuit and the second cylinder control circuit include two-position five-way solenoid valves, and the two-position five-way solenoid valves are connected to the actuating cylinder or the load cylinder for controlling the intake and exhaust of the actuating cylinder or the load cylinder.

3. The cylinder load testing device according to claim 2, wherein, The cylinder load testing device is connected with a PLC control mechanism and a display module. The PLC control mechanism is connected to the two-position five-way solenoid valve for controlling the on-off and commutation intake of the actuator and the load mechanism. The display module includes a sensor and a display screen.

4. The cylinder load testing device according to claim 2, wherein The first cylinder control circuit includes two one-way throttle valves. One end of each one-way throttle valve is respectively connected to the rodless cavity and the rod cavity of the actuating cylinder through a valve joint, and the other end is connected to the two-position five-way solenoid valve. The two-position five-way solenoid valve controls the gas to enter the one-way throttle valve, and then the flow rates of the gas entering and leaving the rodless cavity and the rod cavity of the actuating cylinder are respectively controlled by the two one-way throttle valves.

5. The cylinder load testing device according to claim 1, wherein The second cylinder control circuit includes two precision pressure reducing valves and two overflow valves. The rod cavity and the rodless cavity of the load cylinder are sequentially connected with the overflow valve and the precision pressure reducing valve. The overflow valve and the precision pressure reducing valve are used to adjust the flow rate, pressure and flow velocity to set values.

6. The cylinder load testing device according to claim 1, wherein Both the actuator and the load mechanism are connected to a gas supply mechanism. Both the actuator and the load mechanism include filter pressure reducing valves. The two filter pressure reducing valves are connected to the gas supply mechanism. The gas supply mechanism provides a set flow rate, which flows to the actuator and the load mechanism, and then enters the actuating cylinder and the load cylinder respectively after being filtered by the two filter pressure reducing valves.

7. The cylinder load testing device according to claim 1, characterized in that The intermediate connection structure includes a guide rod, an intermediate bearing sleeved on the guide rod and an intermediate block sleeved on the intermediate bearing. The intermediate block is fixed through a positioning hole.

8. The cylinder load testing device according to claim 7, wherein, The intermediate connection structure includes a cylinder bracket for fixing the actuating cylinder on a set plane. The bottom surface of the intermediate block and the bottom surface of the cylinder bracket are on the same plane. The cylinder bracket includes a plurality of positioning sleeves. The bottom surface of the cylinder bracket, the two side surfaces of the actuating cylinder and the load cylinder are processed with counterbore holes. One end of the positioning sleeve is connected to the side plate of the cylinder bracket, and the other end is connected to the counterbore hole in the actuating cylinder or the load cylinder. The other end of the positioning sleeve is connected to the bottom surface of the cylinder bracket, and the other end is connected to the set plane.

9. The cylinder load testing device according to claim 8, wherein, A floating joint is sleeved on one side of the cylinder bracket facing the guide rod. The floating joint has a T-shaped groove, which is configured as a through hole. The T-shaped groove is floatingly connected to the guide rod, and the T-shaped groove is larger in circumferential diameter than the T-shaped protruding part at one end of the guide rod and meets the stroke accuracy requirements of the guide rod and the T-shaped groove.

10. The cylinder load testing device according to claim 9, characterized in that, The material of the floating joint is 42CrMo, and at the same time, the material of the guide rod is GCr15.

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