Hydraulic cylinder testing mechanism

Abstract

The utility model relates to the technical field of hydraulic control, and provides a hydraulic cylinder testing mechanism. The hydraulic cylinder testing mechanism comprises a first assembly disc, a second assembly disc, an elastic piece and a force sensor, the first assembly disc is arranged at a test position; the second assembling disc and the first assembling disc are arranged at intervals in the first direction, the second assembling disc can move in the first direction relative to the first assembling disc, and the side, away from the first assembling disc, of the second assembling disc is used for being connected with a piston rod of a to-be-tested cylinder; the elastic piece is arranged between the first assembling disc and the second assembling disc in a pre-pressing mode. The force sensor is connected to the side, away from the second assembly disc, of the first assembly disc. According to the hydraulic cylinder testing mechanism provided by the invention, the adaptive movement of the piston rod and the load of the hydraulic cylinder under the actual working condition can be better simulated, and the deviation value between the pressure of the hydraulic cylinder during testing and the pressure under the actual working condition is reduced, so that the testing precision is improved, and the problem of distortion of a testing result is relieved.

Description

Technical Field

[0001] This application relates to the field of hydraulic control technology, and in particular to a hydraulic cylinder testing mechanism. Background Technology

[0002] Active hydraulic actuation systems are widely used in active height control of automotive shock absorbers, robotic arm drives in construction machinery, landing gear retraction and extension control in aircraft, motion control of robot motion mechanisms, and active displacement or force control in motion testing equipment. Their controllable displacement, driving force, and driving torque are key characteristics. Currently, to achieve precise control of active hydraulic actuation systems, it is necessary to accurately measure the actuation force value of the active hydraulic actuation system during the active actuation process in experiments.

[0003] In related technologies, a force sensor is typically connected to the end of the piston rod of a hydraulic cylinder. During testing, both the force sensor and the piston rod are in fixed positions. The hydraulic pump is activated to pump oil into the hydraulic cylinder, and the force sensor then detects the force on the piston. While this method can satisfy the requirement of detecting dynamic values, the test results are prone to distortion, resulting in low accuracy. Utility Model Content

[0004] Therefore, it is necessary to provide a hydraulic cylinder testing mechanism that can better simulate the movement of the piston rod and load of the hydraulic cylinder under actual working conditions, reduce the deviation between the pressure of the hydraulic cylinder during testing and the pressure under actual working conditions, thereby improving the testing accuracy and alleviating the problem of distorted test results.

[0005] A hydraulic cylinder testing mechanism includes a first assembly plate, a second assembly plate, an elastic element, and a force sensor. The first assembly plate is located at a testing position. The second assembly plate is spaced apart from the first assembly plate along a first direction, and the second assembly plate is movable relative to the first assembly plate along the first direction. The side of the second assembly plate opposite to the first assembly plate is used to connect the piston rod of the cylinder to be tested. The elastic element is pre-compressed between the first assembly plate and the second assembly plate. The force sensor is connected to the side of the first assembly plate opposite to the second assembly plate.

[0006] Understandably, the first assembly plate facilitates the installation of the hydraulic cylinder test structure at the target test position. Because an elastic element connects the second and first assembly plates, the second assembly plate has a range of movement relative to the first assembly plate in the first direction. Therefore, when the second assembly plate is connected to the piston rod, the piston rod also has a range of movement in the first direction, allowing the piston rod to be positioned more closely to adapt to the actual load and its fluctuation under actual working conditions. Thus, when hydraulic fluid is pumped into the cylinder under test via the hydraulic pump, the piston rod can exhibit a certain degree of fluctuation to match the load fluctuation under actual working conditions, thereby reducing the deviation between the pressure experienced by the cylinder under test during testing and the actual pressure experienced by the cylinder under test, and thus improving test accuracy.

[0007] In some embodiments, the first assembly plate and the second assembly plate each have an assembly protrusion on their opposite sides, the two assembly protrusions extend toward each other, and each assembly protrusion has an assembly surface at its extended end, with the end of the elastic member pressed against the assembly surface.

[0008] In some embodiments, the mounting protrusion has a limiting surface protruding from the mounting surface, and the elastic element includes a plurality of spiral rings arranged along its own axial direction, with the end of the last spiral ring able to abut against the limiting surface.

[0009] In some embodiments, the elastic element is a spring, and the mounting surface and the limiting surface smoothly transition together to form a helical surface adapted to the end of the spring.

[0010] In some embodiments, the first assembly plate and / or the second assembly plate are provided with a limiting protrusion, the assembly protrusion is arranged around the outer periphery of the limiting protrusion, and the end of the elastic member is sleeved on the outer periphery of the limiting protrusion and pressed against the assembly surface.

[0011] In some embodiments, the first assembly plate has a first assembly hole for connecting the force sensor, and the limiting protrusion on the first assembly plate has a cavity; and / or, the limiting protrusion on the second assembly plate is tapered from the second assembly plate toward the first assembly plate.

[0012] In some embodiments, the hydraulic cylinder testing mechanism further includes a guide member that passes between the first assembly plate and the second assembly plate and is slidably connected to the first assembly plate or the second assembly plate to guide the movement of the second assembly plate.

[0013] In some embodiments, the hydraulic cylinder testing mechanism further includes a limiting block connected to the guide member, wherein one of the first assembly plate and the second assembly plate is slidably connected to the guide member, and the other is capable of abutting against the limiting block to limit the displacement of the second assembly plate along a first direction.

[0014] In some embodiments, multiple guide members are provided and arranged at circumferential intervals along the first assembly disk and / or the second assembly disk, with the multiple guide members located on the outer peripheral side of the elastic member.

[0015] In some embodiments, the hydraulic cylinder testing mechanism further includes a test bench, to which the first assembly plate and the force sensor are rigidly connected; and / or, the hydraulic cylinder testing mechanism further includes a position adjustment component connected to the force sensor for driving the force sensor to move along a first direction, wherein the first assembly plate, the second assembly plate, and the elastic component move synchronously. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A simplified diagram of a hydraulic cylinder testing mechanism provided in an embodiment of this application;

[0018] Figure 2 This is a partial front view schematic diagram of a hydraulic cylinder testing mechanism provided in an embodiment of this application;

[0019] Figure 3 This is a partial rear view schematic diagram of a hydraulic cylinder testing mechanism provided in an embodiment of this application;

[0020] Figure 4 This is a first schematic diagram of the first assembly plate in a hydraulic cylinder testing mechanism provided in an embodiment of this application;

[0021] Figure 5 This is a second schematic diagram of the first assembly plate in a hydraulic cylinder testing mechanism provided in an embodiment of this application;

[0022] Figure 6 This is a first schematic diagram of the second assembly plate in a hydraulic cylinder testing mechanism provided in an embodiment of this application;

[0023] Figure 7 This is a second schematic diagram of the second assembly plate in a hydraulic cylinder testing mechanism provided in an embodiment of this application.

[0024] Reference numerals: 10, First assembly plate; 20, Second assembly plate; 30, Elastic element; 31, First end; 32, Second end; 40, Force sensor; 51, Assembly protrusion; 52, Limiting protrusion; 60, Guide element; 70, Limiting block; 80, Cylinder to be tested; 81, Piston; 82, Piston rod; 90, Hydraulic pump; 101, First assembly hole; 102, First guide hole; 202, Second guide hole; 501, Assembly surface; 502, Limiting surface; 511, First assembly protrusion; 512, Second assembly protrusion; 521, First limiting protrusion; 522, Second limiting protrusion; 801, Restoration cavity; 802, Compression cavity; 5011, First assembly surface; 5012, Second assembly surface; 5021, First limiting surface; 5022, Second limiting surface; 5211, Concave cavity. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] It should be noted that when a component is referred to as being "fixed to" or "attached to" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0030] In related technologies, when measuring the power value of an active hydraulic actuation system, a force sensor is typically connected to the end of the piston rod of the hydraulic cylinder. During the test, both the force sensor and the piston rod are fixed to the testing machine to maintain their positions, thus ensuring that the piston position of the hydraulic cylinder is fixed and the volumes of the compression and recovery chambers remain constant. The hydraulic pump is started by a motor to pump oil into the hydraulic cylinder. The piston rod is subjected to the pressure of the oil, which transmits the force to the force sensor, thus realizing the detection of the power value. However, precisely because the piston rod is fixed in position, it cannot make a floating motion that matches the actual load under working conditions. Consequently, the pressure on the compression and recovery chambers of the hydraulic cylinder during the test is greater than the actual pressure under working conditions, causing the test results to be distorted.

[0031] To address this issue, one embodiment of this application provides a hydraulic cylinder testing mechanism that can better simulate the floating of the piston rod in actual working conditions to match the load, reducing the deviation between the pressure during testing and the actual pressure, thereby improving testing accuracy and mitigating the problem of distorted test results. The hydraulic cylinder testing mechanism is described in detail below.

[0032] Please see Figures 1 to 3In some embodiments, the hydraulic cylinder testing mechanism includes a first assembly plate 10, a second assembly plate 20, an elastic element 30, and a force sensor 40. The first assembly plate 10 and the second assembly plate 20 are arranged at a distance along a first direction, and the second assembly plate 20 is movable relative to the first assembly plate 10 along the first direction. The first assembly plate 10 is fixed in the test position, and the side of the second assembly plate 20 facing away from the first assembly plate 10 is used to connect the piston rod 82 of the cylinder 80 under test. The elastic element 30 is pre-compressed between the first assembly plate 10 and the second assembly plate 20, and the force sensor 40 is fixed on the side of the first assembly plate 10 facing away from the second assembly plate 20.

[0033] It should be noted beforehand that the cylinder under test, 80, is a hydraulic cylinder, which has a compression chamber 802 and a recovery chamber 801, located on opposite sides of the piston 81. A portion of the piston rod 82 is located in the recovery chamber 801 and connected to the piston 81. When oil is pumped into the recovery chamber 801, the pressure inside the chamber increases, causing the piston 81 to experience a force that moves towards the compression chamber 802; conversely, when oil is pumped into the compression chamber 802, the pressure inside the chamber increases, causing the piston 81 to experience a force that moves towards the recovery chamber 801.

[0034] Wherein, the aforementioned first direction is the direction of movement of piston 81, for example... Figures 1 to 3 In the vertical direction, the compression chamber 802 is located below the restoration chamber 801.

[0035] Understandably, the arrangement of the first assembly plate 10 facilitates the installation of the hydraulic cylinder test structure at the target test position. Since the second assembly plate 20 is connected to the first assembly plate 10 by an elastic element 30, the second assembly plate 20 has a range of movement relative to the first assembly plate 10 in the first direction. Therefore, when the second assembly plate 20 is connected to the piston rod 82, the piston rod 82 also has a range of movement in the first direction, allowing the piston rod 82 to be positioned more closely to adapt to the actual load under working conditions. Thus, when hydraulic fluid is pumped into the cylinder 80 under test via the hydraulic pump 90, the piston rod 82 can generate a certain amount of float to adapt to the load fluctuation under actual working conditions, thereby reducing the deviation between the pressure borne by the cylinder 80 during testing and the pressure borne by the cylinder 80 under actual working conditions, and thus improving test accuracy.

[0036] In actual testing, the cylinder under test 80 is connected to a hydraulic pump 90. For example, when the hydraulic pump 90 pumps oil into the recovery chamber 801 of the cylinder under test 80, it generates a downward force on the piston 81 in the first direction. Due to the elastic element 30, the piston rod 82 has a floating range. Therefore, the piston 81 drives the piston rod 82 to move downward in the first direction, and the second mounting plate 20 moves downward synchronously with the piston rod 82 to stretch the elastic element 30. Since the elastic element 30 is fixed to the first mounting plate 10, it transmits a downward pulling force to the first mounting plate 10, and the force sensor 40 on the first mounting plate 10 detects the force.

[0037] Conversely, when the hydraulic pump 90 pumps oil into the compression chamber 802 of the cylinder under test 80, it generates an upward force on the piston 81 in the first direction. The piston 81 drives the piston rod 82 to move upward in the first direction. The second assembly plate 20 moves upward synchronously with the piston rod 82 to compress the elastic element 30. The elastic element 30 transmits upward pressure to the first assembly plate 10, and the force sensor 40 on the first assembly plate 10 detects the force.

[0038] In some cases, if the test is only used to test the lifting force (i.e., upward movement) of the cylinder 80 under test, the elastic element 30 can also be directly pressed between the first assembly plate 10 and the second assembly plate 20.

[0039] It should be added that the structure and detection principle of the force sensor 40 are existing mature technologies, and will not be elaborated here.

[0040] In practical use, the hydraulic cylinder testing mechanism also includes a test bench, to which both the first assembly plate 10 and the force sensor 40 are rigidly connected. The test bench includes a top plate, a bottom plate, and columns. The top and bottom plates are arranged vertically opposite each other at intervals, and the columns connect the top and bottom plates to provide support. Multiple columns can be provided and arranged at intervals along the circumference of the top plate to improve the reliability of the test bench. Both the first assembly plate 10 and the force sensor 40 are rigidly connected to the top plate, for example, by screws. The force sensor 40 is also screwed to the first assembly plate 10, forming an integral structure.

[0041] In some embodiments, the hydraulic cylinder testing mechanism further includes a position adjusting component connected to the force sensor 40, used to drive the force sensor 40 to move along a first direction, with the first assembly plate 10, the second assembly plate 20, and the elastic element 30 moving synchronously. The first assembly plate 10, the second assembly plate 20, and the elastic element 30 together form a testing structure for connecting the force sensor 40 and the piston rod 82. Therefore, when the force sensor 40 is driven to move using the position adjusting component, the testing structure also moves synchronously, thereby adjusting the distance between the testing structure and the cylinder under test 80 along the first direction to accommodate the stroke of different types of cylinders under test.

[0042] In some specific embodiments, the position adjustment component is rigidly connected to the top plate of the test bench and connected to the force sensor 40. For example, if the position adjustment component is a hydraulic cylinder, the force sensor 40 is fixedly connected to the piston rod of the hydraulic cylinder, used to adjust the position of the force sensor 40 and the test structure in the vertical direction. It should be noted that the hydraulic cylinder here is not the aforementioned test cylinder. During the test of the test cylinder, the position adjustment component does not drive the force sensor 40 to move, in order to maintain the stable assembly of the force sensor and facilitate the detection of the operating force value of the test cylinder 80.

[0043] Please see Figures 2 to 7 In some embodiments, mounting protrusions 51 are provided on opposite sides of the first mounting plate 10 and the second mounting plate 20. The two mounting protrusions 51 extend towards each other, and each mounting protrusion 51 has a mounting surface 501 at its extended end. The end of the elastic member 30 is pressed against the mounting surface 501. The elastic member 30 has a first end 31 and a second end 32 arranged at intervals along its own axial direction. The first end 31 corresponds to the first mounting protrusion 511 on the first mounting plate 10, and is pressed against the first mounting surface 5011 of the first mounting protrusion 511; and the second end 32 corresponds to the second mounting protrusion 512 on the second mounting plate 20, and is pressed against the second mounting surface 5012 of the second mounting protrusion 512. Understandably, by using the protrusion of the assembly protrusion 51 relative to the first assembly plate 10 and the second assembly plate 20, it is equivalent to raising the assembly position of the elastic element 30 relative to the first assembly plate 10 and the second assembly plate 20, so as to reduce the assembly interference between the first assembly plate 10 and the force sensor 40, and between the second assembly plate 20 and the piston rod 82, and maintain the stable assembly of the elastic element 30.

[0044] In this configuration, the first end 31 of the elastic element 30 is connected to the first mounting protrusion 511 by a screw, and the second end 32 of the elastic element 30 is connected to the second mounting protrusion 512 by a screw. Both the first end 31 and the second end 32 of the elastic element 30 are welded with connecting pieces for engaging with the screws. Alternatively, each of the first mounting protrusion 511 and the second mounting protrusion 512 has a hook on its opposite side to engage with the elastic element 30 for fastening. Of course, the hooks can also engage with the connecting pieces to further improve the connection reliability of the elastic element 30.

[0045] Please continue reading. Figures 2 to 7In some embodiments, the assembly protrusion 51 is provided with a limiting surface 502 protruding from the assembly surface 501, and the elastic member 30 includes a plurality of spiral coils arranged along its own axial direction, with the end of the last spiral coil abutting against the limiting surface 502. That is, the limiting surface 502 can limit the rotation of the elastic member 30 relative to the first assembly protrusion 511 and the second assembly protrusion 512, minimizing the rotation of the elastic member 30 around its own axis during compression or pressing, thereby improving the stability of the force and facilitating the measurement of the steady-state working force value. Specifically, the first assembly disc 10 corresponds to the first limiting surface 5021, the second assembly disc 20 corresponds to the second limiting surface 5022, the end of the spiral coil at the first end 31 of the elastic member 30 abuts against the first limiting surface 5021 for limitation, and the end of the spiral coil at the second end 32 abuts against the second limiting surface 5022 for limitation.

[0046] In some embodiments, the elastic element 30 is a spring, with the mounting surface 501 and the limiting surface 502 smoothly transitioning and together forming a helical surface adapted to the end of the spring. Understandably, the helical surface design allows the spring to be more evenly distributed on the first mounting plate 10 and the second mounting plate 20 when under pressure, avoiding deformation deviations caused by uneven force distribution, thereby improving measurement accuracy. Simultaneously, the helical surface also guides the deformation direction of the spring under force, making the spring deformation more stable and controllable. Therefore, this design not only enhances the measurement accuracy of the hydraulic cylinder testing mechanism but also improves its service life and reliability.

[0047] like Figure 2 and Figure 3 As shown, in some embodiments, the spiral shape of the first mounting surface 5011 is opposite to that of the second mounting surface 5012. Taking the front-to-back direction as an example, when the spiral protrusion on the first mounting surface 5011 is located in a rearward position, the spiral protrusion on the second mounting surface 5012 is located in a forward position. The first limiting surface 5021 and the second limiting surface 5022 are then arranged radially apart along the elastic member 30. This arrangement further improves the assembly reliability and stability of the elastic member 30 and facilitates force transmission. The end of the spiral protrusion forms the limiting surface 502.

[0048] Please continue reading. Figures 2 to 7In some embodiments, both the first assembly plate 10 and the second assembly plate 20 are provided with limiting protrusions 52. Assembly protrusions 51 surround the outer periphery of the limiting protrusions 52. The end of the elastic member 30 is sleeved on the outer periphery of the limiting protrusions 52 and pressed against the corresponding assembly surface 501. The first assembly plate 10 corresponds to the first limiting protrusion 521, and the second assembly plate 20 corresponds to the second limiting protrusion 522. The first end 31 is sleeved on the outer periphery of the first limiting protrusion 521, and the second end 32 is sleeved on the outer periphery of the second limiting protrusion 522. It can be understood that the first limiting protrusion 521 and the second limiting protrusion 522 are used to limit the radial displacement of the elastic member 30, reducing the displacement or shaking of the elastic member 30 during compression or tension, further improving assembly reliability and detection accuracy.

[0049] Alternatively, only the first assembly plate 10 may have a first limiting protrusion 521, or only the second assembly plate 20 may have a second limiting protrusion 522. As long as the elastic element 30 can be stably and reliably assembled, this is just an example.

[0050] In some other embodiments, an outer peripheral protrusion may be provided on the outer periphery of the mounting protrusion 51, surrounding the outer periphery of the limiting protrusion 52, both protruding relative to the mounting protrusion 51. An annular mounting gap is formed between the outer peripheral protrusion and the limiting protrusion 52 for insertion of the end of the elastic member 30, thereby limiting both radial inward and radial outward displacement of the elastic member 30, resulting in higher reliability.

[0051] In some specific embodiments, the elastic element 30 can be a rectangular spring, meaning that the cross-section of each spiral coil is rectangular, so as to contact the mounting surface 501, increasing the connection area, which is equivalent to increasing the force-bearing area and facilitating the transmission of force. Alternatively, the cross-section of each spiral coil in the elastic element 30 can be circular.

[0052] like Figures 2 to 4 As shown, in some embodiments, the first assembly plate 10 is provided with a first assembly hole 101 for connecting the force sensor 40, and the first limiting protrusion 521 corresponding to the first assembly plate 10 is provided with a cavity 5211, the opening of which faces the second assembly plate 20. The force sensor 40 can extend into the cavity 5211 through the second assembly hole, facilitating the installation and removal of the sensor and the first assembly plate 10 by the operator. The cavity 5211 is designed to reduce the weight of the first assembly plate 10, achieving a lightweight design. The cavity 5211 communicates with and is coaxially arranged with the first assembly hole 101, ensuring the coaxiality of the force sensor 40 and the first assembly plate 10, further improving assembly and detection accuracy.

[0053] In some embodiments, the second assembly plate 20 has a second assembly hole on the side opposite to the first assembly plate 10, which facilitates the insertion of the end of the piston rod 82 into the second assembly hole for fixed connection with the second assembly plate 20, thereby improving assembly reliability. The first assembly hole 101 and the second assembly hole can also be coaxially arranged to ensure the coaxial arrangement of the piston rod 82 and the force sensor 40, improving testing accuracy.

[0054] like Figures 1 to 3 As shown, in some embodiments, the hydraulic cylinder testing mechanism further includes a guide 60, which passes between the first assembly plate 10 and the second assembly plate 20. The guide 60 is movably connected to the first assembly plate 10 or the second assembly plate 20 to guide the movement of the second assembly plate 20.

[0055] Specifically, one end of the guide member 60 can be fixed to the second assembly plate 20 and slidably connected to the first assembly plate 10. For example, the first assembly plate 10 is provided with a first guide hole 102 for the guide member 60 to pass through. A guide bushing or a linear bearing can be installed in the first guide hole 102 to satisfy the slidable connection with the guide member 60 and reduce the wear of the guide member 60 and the first assembly plate 10. When the second assembly plate 20 moves along the first direction, it can drive the guide member 60 to move synchronously. The guide member 60 cooperates with the first guide hole 102 to guide the movement direction of the second assembly plate 20 more accurately, reduce the shaking of the second assembly plate 20, and thus reduce the shaking of the piston rod 82 and the elastic member 30.

[0056] Alternatively, one end of the guide member 60 can be fixed to the first assembly plate 10, and the second assembly plate 20 can be provided with a second guide hole 202 for the guide member 60 to pass through. The second assembly plate 20 can move along the axial direction (i.e., the first direction) of the guide member 60 to achieve the guiding function.

[0057] In other words, by using the guide 60, it can be ensured that the piston rod 82 and the force sensor 40 are always on the same axis during the movement, which makes it easier for the force sensor 40 to more accurately drive the main action of the piston rod 82 along the movement direction.

[0058] In some specific embodiments, the guide member 60 is a guide rod with a circular cross-section.

[0059] like Figures 1 to 3As shown, in some embodiments, multiple guide members 60 are provided and arranged at intervals along the circumference of the first assembly plate 10, with the multiple guide members 60 located on the outer periphery of the elastic member 30. That is, by utilizing the mutual cooperation of the multiple guide members 60, the straightness and stability of the second assembly plate 20 and the piston rod 82 during movement are further enhanced, and the deflection of the elastic member 30 is further reduced. Each guide member 60 plays a role in guiding the smooth movement of the second assembly plate 20 and the piston rod 82, and through mutual cooperation and restraint, ensures that the straightness and accuracy of its movement trajectory are maintained even under large loads or lateral forces. Furthermore, placing the guide members 60 on the outer periphery of the elastic member 30 not only effectively utilizes space but also avoids direct interference between the guide members 60 and the elastic member 30, thereby reducing potential friction and wear problems.

[0060] In some specific embodiments, the projections of the first assembly plate 10 and the second assembly plate 20 in the vertical direction are both circular. Multiple guide members 60 are arranged at circumferential intervals along the circle.

[0061] like Figures 1 to 3 As shown, in some embodiments, the hydraulic cylinder testing mechanism further includes a limiting block 70, which is connected to the guide member 60. The limiting block 70 can abut against the first assembly plate 10 or the second assembly plate 20 to limit the displacement of the second assembly plate 20 along the first direction. That is, by using the limiting block 70, the displacement of the second assembly plate 20 can be limited, especially the downward displacement of the second assembly plate 20, preventing the second assembly plate 20 from disengaging relative to the guide member 60 and improving overall reliability. When the guide member 60 moves with the second assembly plate 20, the limiting block 70 can abut against the first assembly plate 10 for limitation; conversely, when the guide member 60 is stationary, i.e., does not move with the second assembly plate 20, the limiting block 70 can abut against the second limiting plate for limitation.

[0062] In other words, one of the first assembly plate 10 and the second assembly plate 20 is slidably connected to the guide member 60, while the other, on its opposite side, can abut against the limiting block 70 for limitation. Taking the guide member 60 fixed to the first assembly plate 10 as an example, the guide member 60 passes through the second guide hole 202 of the second assembly plate 20. At this time, the limiting block 70 is connected to the end of the guide member 60 located at the bottom of the second assembly plate 20. When the second assembly plate 20 moves downward, the abutment between the limiting block 70 and the second assembly plate 20 can limit the downward displacement, prevent the second assembly plate 20 from detaching from the guide member 60, and improve overall reliability. The limiting block 70 is made of high-strength, wear-resistant material, which can maintain the integrity of its shape and function during long-term use, further improving the durability and reliability of the hydraulic cylinder testing mechanism.

[0063] Alternatively, taking the guide member 60 fixed to the second assembly plate 20 as an example, the guide member 60 passes through the first guide hole 102 of the first assembly plate 10, and moves synchronously with the second assembly plate 20. A limiting block 70 is connected to the end of the guide member 60 located at the top of the first assembly plate 10. When the second assembly plate 20 moves downwards, the limiting block 70 moves synchronously with the guide member 60 and can abut against the upper surface of the first assembly plate 10 to meet the limiting requirements.

[0064] In some embodiments, a buffer pad may be provided on the side of the limiting block 70 facing the second assembly plate 20 to buffer and reduce wear.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A hydraulic cylinder testing mechanism, characterized by, include: The first assembly plate is used to fix it at the test position; The second assembly plate is arranged at a distance from the first assembly plate along a first direction. The second assembly plate is movable relative to the first assembly plate along the first direction. The side of the second assembly plate opposite to the first assembly plate is used to connect the piston rod of the cylinder to be tested. An elastic element, pre-compressed, is disposed between the first assembly plate and the second assembly plate; A force sensor is fixed on the side of the first assembly plate opposite to the second assembly plate.

2. The hydraulic cylinder test mechanism of claim 1, wherein, The first assembly plate and the second assembly plate each have an assembly protrusion on their opposite sides. The two assembly protrusions extend toward each other, and each assembly protrusion has an assembly surface at its extended end. The end of the elastic element is pressed against the assembly surface.

3. The hydraulic cylinder test mechanism of claim 2, wherein, The assembly protrusion has a limiting surface protruding from the assembly surface, and the elastic element includes a plurality of spiral rings arranged along its own axial direction, with the end of the last spiral ring able to abut against the limiting surface.

4. The hydraulic cylinder test mechanism of claim 3, wherein, The elastic element is a spring, and the mounting surface and the limiting surface smoothly transition and together form a helical surface that is adapted to the end of the spring.

5. The hydraulic cylinder testing mechanism according to claim 2, characterized in that, The first assembly plate and / or the second assembly plate are provided with a limiting protrusion. The assembly protrusion surrounds the outer periphery of the limiting protrusion. The end of the elastic member is sleeved on the outer periphery of the limiting protrusion and pressed against the assembly surface.

6. The hydraulic cylinder test mechanism of claim 5, wherein, The first assembly plate is provided with a first assembly hole for connecting the force sensor, and the limiting protrusion on the first assembly plate is provided with a cavity; and / or, The limiting protrusion on the second assembly plate is gradually tapered from the second assembly plate toward the first assembly plate.

7. The hydraulic cylinder test mechanism of claim 1, wherein, The hydraulic cylinder testing mechanism also includes a guide member, which passes between the first assembly plate and the second assembly plate and is slidably connected to the first assembly plate or the second assembly plate to guide the movement of the second assembly plate.

8. The hydraulic cylinder test mechanism of claim 7, wherein, The hydraulic cylinder testing mechanism further includes a limiting block connected to the guide member. One of the first assembly plate and the second assembly plate is slidably connected to the guide member, and the other can abut against the limiting block to limit the displacement of the second assembly plate along the first direction.

9. The hydraulic cylinder test mechanism of claim 7, wherein, The guide members are provided in multiple ways and are arranged at circumferential intervals along the first assembly plate and / or the second assembly plate, with the multiple guide members located on the outer peripheral side of the elastic member.

10. The hydraulic cylinder test mechanism of any of claims 1-9, wherein, The hydraulic cylinder testing mechanism further includes a test bench, to which both the first assembly plate and the force sensor are rigidly connected; and / or The hydraulic cylinder testing mechanism also includes a position adjustment component connected to the force sensor, which drives the force sensor to move along a first direction, and the first assembly plate, the second assembly plate, and the elastic element move synchronously.

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