Hydraulic cylinder performance test tool

Abstract

The utility model relates to technical field of hydraulic cylinder, concretely relates to a kind of hydraulic cylinder performance test tool, including bottom platform, the two ends of bottom platform are respectively vertically connected with first support platform and second support platform, the top outside of second support platform is fixedly connected with the outer cover plate that is arc-shaped arrangement, the top surface of bottom platform is provided with the horizontal guide slot, guide slot is movably inserted with base assembly, the inner surface of first support platform and second support platform is respectively connected with first clamping frame and second clamping frame.The inner cavity of base body is trapezoidal chamber that is big in upper and small in lower, the inner limiting air bag in it is surrounded with matched conical outer surrounding layer, the structure constitutes a self-adapting flexible self-locking mechanism, when inflating, air bag radially expands preliminary holds tightly cylinder body;After pressure increases, conical outer surrounding layer generates radial expansion force and downward component force under air bag thrust, so that it is pressed tightly with trapezoidal chamber inner wall and generates huge friction, and cylinder body base is extruded upwards, realizes bidirectional self-locking.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic cylinders, and specifically to a hydraulic cylinder performance testing fixture. Background Technology

[0002] As a core hydraulic actuator, the performance and reliability of the hydraulic cylinder directly affect the working state of the entire hydraulic system. Therefore, performance testing before leaving the factory or after maintenance is crucial.

[0003] Traditional hydraulic cylinder testing fixtures often use rigid clamps with threaded locking to fix the cylinder body. This method has problems such as low clamping efficiency, easy scratching of the cylinder body surface, and difficulty in adapting to cylinders of different diameters. Furthermore, when testing the piston rod's resistance to eccentric loads, it can usually only apply unidirectional lateral force, lacking effective constraints and protection against bending and instability that may occur under stress. The test conditions are limited, unable to realistically simulate complex stress scenarios, and pose safety hazards. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a hydraulic cylinder performance testing fixture that can solve the following problems:

[0005] The problems include low clamping efficiency, difficulty in adapting to cylinders of different diameters, and inadequate protection.

[0006] To solve the above-mentioned technical problems, the present invention proposes the following technical solution:

[0007] A hydraulic cylinder performance testing fixture includes a base platform, with a first support platform and a second support platform vertically connected to both ends of the base platform. An arc-shaped outer protective plate is fixedly connected to the top outer side of the second support platform. A transverse guide groove is opened on the top surface of the base platform, and a base assembly is movably embedded in the guide groove. A first clamping frame and a second clamping frame are respectively connected to the inner surfaces of the first support platform and the second support platform. A pressure application component is connected to the top inner side of the second support platform.

[0008] The base assembly includes a base body and an inner limiting airbag inside it. An outer surrounding layer is provided on the outside of the inner limiting airbag. The inner cavity of the base body is a trapezoidal chamber that is larger at the top and smaller at the bottom. The outer surrounding layer is a conical elastic surrounding layer that matches the inner wall of the trapezoidal chamber.

[0009] The pressure application assembly includes a mounting base and a contact roller on its inner surface for contacting the piston rod. Both longitudinal surfaces of the mounting base are connected to outer limiting plates, which are staggered vertically along both sides of the longitudinal direction of the mounting base. The outer limiting plates and the mounting base are connected by a miniature electric telescopic rod.

[0010] Furthermore, the outer protective panel is made of transparent acrylic sheet, and a set of positioning legs extends downward toward the bottom of the first support platform. The top of the first support platform has a through-type limiting groove corresponding to the positioning legs in the outer protective panel. The outer protective panel and the outer side of the second support platform are connected in a vertical position by a shaft.

[0011] Furthermore, the inner wall of the guide groove and the base body are slidably connected by a linear guide rail, and the base body and the guide groove are driven by a set of electric telescopic rods.

[0012] Furthermore, the inner limiting airbag is made of high-strength polyurethane coated fabric, the surface of the airbag is provided with a layer of wear-resistant rubber, the outer surrounding layer is made of high-elasticity, high-tear-resistant silicone rubber, and a set of quick exhaust switches is provided at the top of the inner limiting airbag.

[0013] Furthermore, the outer side of the first clamping frame and the first support platform are connected by a set of transverse electric telescopic rods, and the outer side of the second clamping frame and the second support platform are connected by multiple sets of fixing buckles.

[0014] Furthermore, a first clamping layer and a second clamping layer are fixedly connected to the inner sides of the first clamping frame and the second clamping frame, respectively. The inner surfaces of the first clamping layer and the second clamping layer are both arc-shaped and concave, and are also provided with a wear-resistant nylon layer.

[0015] Furthermore, the inner surface of the mounting base is fixedly connected with supports for corresponding contact rollers on both longitudinal sides, and the contact rollers are embedded in the supports in a longitudinal horizontal position. Deep groove ball bearings are installed inside the supports.

[0016] Furthermore, the contact roller surface is provided with a polyurethane-coated anti-slip layer, and the contact roller has a built-in pressure sensing mechanism.

[0017] Furthermore, the outer side of the mounting base and the second support platform are connected by a hydraulic mechanism.

[0018] As can be seen from the above technical solution, the beneficial effects of this utility model are:

[0019] 1. In this utility model, the inner cavity of the base body is a trapezoidal chamber that is larger at the top and smaller at the bottom. The inner limiting airbag inside is surrounded by a matching conical outer surrounding layer. This structure constitutes an adaptive flexible self-locking mechanism. When inflated, the airbag expands radially and initially grips the cylinder. After the pressure increases, the conical outer surrounding layer generates radial expansion force and downward component force under the thrust of the airbag, causing it to press against the inner wall of the trapezoidal chamber to generate huge friction force and squeeze the cylinder base upward, thereby achieving two-way self-locking in both radial and axial directions. This effectively achieves rapid clamping, adaptability to different cylinder diameters, flexible contact protection of the cylinder surface, and effectively suppresses vibration and small displacement during testing, ensuring absolute stability of the clamping.

[0020] 2. In this utility model, the pressure application component includes a contact roller driven by a hydraulic mechanism and coated with a polyurethane anti-slip layer, and two sets of external limiting plates that are staggered vertically along both sides of the mounting base and whose width can be adjusted by a micro electric telescopic rod. The contact roller is used to apply a precise lateral load to the piston rod and roll accordingly, while the two sets of external limiting plates that are staggered vertically form an adjustable sliding guide pair. While applying lateral force, they can constrain the piston rod from both sides, effectively preventing it from radially running or longitudinally bending, ensuring the precise application of the test force, and expanding the severity of the test conditions.

[0021] 3. In this utility model, the outer protective plate is connected to the second support platform by a rotating shaft. The bottom end of the outer protective plate is provided with a positioning foot, which can cooperate with the through-type limiting groove at the top of the first support platform to achieve convenient and unified protection and operation. The transparent acrylic material makes it easy to observe the testing process. The mechanical structure that positions itself when flipped and falling is simple and quick to operate. It also provides a physical installation foundation for subsequent integration with electrical safety interlocking systems (such as electrical control switches), greatly improving the safety and standardization of the equipment. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0023] Figure 1 This is a front view of the overall structure of this utility model;

[0024] Figure 2 This is a front view of the internal structure connection in this utility model;

[0025] Figure 3 This is an exploded view of the base assembly connection in this utility model;

[0026] Figure 4 This is an exploded view of the pressure application component connection in this utility model.

[0027] Figure label:

[0028] 1. Base platform; 2. First support platform; 3. Second support platform; 4. Outer protective plate; 5. Guide groove; 6. Base assembly; 7. First clamping frame; 8. Second clamping frame; 9. First clamping layer; 10. Second clamping layer; 11. Pressure application assembly; 12. Base body; 13. Inner limiting airbag; 14. Outer surrounding layer; 15. Mounting seat; 16. Outer limiting plate; 17. Support; 18. Contact roller. Detailed Implementation

[0029] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0030] See Figure 1-4 As shown, a hydraulic cylinder performance testing fixture includes a base platform 1, with a first support platform 2 and a second support platform 3 vertically connected to both ends of the base platform 1. An arc-shaped outer protective plate 4 is fixedly connected to the top outer side of the second support platform 3. A transverse guide groove 5 is opened on the top surface of the base platform 1, and a base assembly 6 is movably embedded in the guide groove 5. A first clamping frame 7 and a second clamping frame 8 are connected to the inner surfaces of the first support platform 2 and the second support platform 3, respectively. A first clamping layer 9 and a second clamping layer 10 are fixedly connected to the inner sides of the first clamping frame 7 and the second clamping frame 8, respectively. A pressure application component 11 is connected to the top inner side of the second support platform 3. The pressure application component 11 is located above the second clamping frame 8 on the same side, while the second clamping frame 8 and the first clamping frame 7 are horizontally opposite to each other.

[0031] The base assembly 6 includes a base body 12 and an inner limiting airbag 13 inside it, and an outer surrounding layer 14 is provided around the outer side of the inner limiting airbag 13.

[0032] The pressure application assembly 11 includes a mounting base 15 and a contact roller 18 disposed on its inner surface. Supports 17 corresponding to the contact roller 18 are fixedly connected to the longitudinal sides of the inner surface of the mounting base 15. The contact roller 18 is embedded in the support 17 in a longitudinal horizontal position. A deep groove ball bearing is disposed in the support 17. Both longitudinal sides of the mounting base 15 are connected to an outer limiting plate 16.

[0033] In this embodiment of the utility model, the outer protective plate 4 is made of transparent acrylic sheet, and a set of positioning feet is provided extending downward from the bottom end of the first support platform 2. The top of the first support body 2 is provided with a through-type limiting groove corresponding to the positioning feet in the outer protective plate 4. The outer protective plate 4 and the outer side of the second support platform 3 are connected in a vertical state by a shaft. The inner wall of the guide groove 5 and the base body 12 are slidably connected by a linear guide rail. The base body 12 and the guide groove 5 are connected by a set of electric telescopic rods.

[0034] The base body 12 is rectangular in shape with an open top. Its inner cavity is a trapezoidal chamber that is wider at the top and narrower at the bottom. The inner walls of the inner cavity are equipped with quick-connect interfaces corresponding to the inner limiting airbag 13. The inner limiting airbag 13 is cylindrical and vertically arranged. The outer surrounding layer 14 is a conical surrounding layer that is wider at the top and narrower at the bottom. It is connected to the inner limiting airbag 13. The outer surrounding layer 14 is an elastic surrounding layer. The surface of the inner limiting airbag 13 is also equipped with a protective layer. The inner limiting airbag 13 is made of high-strength polyurethane coated fabric. The surface of the airbag is also equipped with a wear-resistant rubber layer. The outer surrounding layer 14 is made of high-elasticity, high-tear-resistant silicone rubber layer. The top of the inner limiting airbag 13 is equipped with a set of quick exhaust switches. The base body 12 is equipped with an airflow pipe and a pump mechanism corresponding to the inner limiting airbag 13. The outer surface of the outer surrounding layer 14 is also attached to the inner wall of the base body 12.

[0035] The inner cavity of the base body 12 is a trapezoidal chamber that is larger at the top and smaller at the bottom, and the outer surrounding layer 14 is set as a matching conical elastic surrounding layer. Together, these structures constitute an adaptive flexible self-locking mechanism. In actual operation, when the inner limiting airbag 13 is inflated, it first expands radially to hold the hydraulic cylinder body. As the pressure increases, the conical outer surrounding layer 14 generates an outward expansion force and a downward component force under the thrust of the airbag, causing it to fit tightly against the inner wall of the trapezoidal cavity to generate huge frictional force, and exerts an upward squeezing force on the cylinder base, thereby achieving two-way self-locking fixation in both radial and axial directions, effectively reducing vibration and small displacement, and ensuring clamping stability.

[0036] The first clamping frame 7 and the second clamping frame 8 are respectively arranged in a trapezoidal frame and a three-sided rectangular frame, with the opening ends of both facing inward. The outer side of the first clamping frame 7 and the first support platform 2 are connected by a set of transverse electric telescopic rods. The outer side of the second clamping frame 8 and the second support platform 3 are connected by multiple sets of fixing buckles. The first clamping layer 9 is set vertically along the inner end surface of the first clamping frame 7. Two sets of second clamping layers 10 are arranged at the upper and lower positions along the inner end of the second clamping frame 8. The inner surfaces of the first clamping layer 9 and the second clamping layer 10 are both arc-shaped and concave. The arc-shaped and concave inner surfaces of the first clamping layer 9 and the second clamping layer 10 are also provided with a wear-resistant nylon layer. The mounting base 15 is set as a longitudinal rectangular base, and its outer side is connected to the second support platform 3 by another set of hydraulic mechanisms.

[0037] The outer limit plate 16 is arranged horizontally as a whole, and two sets are distributed vertically and vertically staggered on both sides of the mounting base 15. The outer limit plate 16 and the mounting base 15 are connected by a miniature electric telescopic rod. The contact roller 18 is arranged vertically as a whole, and its surface is provided with a polyurethane anti-slip layer. The contact roller 18 has a built-in pressure sensing mechanism.

[0038] The two sets of external limiting plates 16, which are staggered vertically, are adjustable in width via miniature electric telescopic rods. While the contact roller 18 applies lateral force, they contact and constrain the piston rod from both sides, forming a reliable sliding guide pair. This effectively prevents the slender piston rod from radially jumping or longitudinally bending under pressure, ensuring accurate and stable application of the test force and protecting the piston rod from damage caused by abnormal bending.

[0039] When using this device, the user first vertically places the external hydraulic cylinder to be tested into the base body 12. The inner limiting airbag 13 in the base body 12 expands under the control of the matching pump body, and works with the outer surrounding layer 14 to complete the flexible limiting of the bottom of the external hydraulic cylinder.

[0040] Then the electric telescopic rod between the base body 12 and the guide groove 5 is activated, pushing the entire base assembly 6 to move laterally along the guide groove 5, so that the hydraulic cylinder to be tested approaches the second clamping frame 8. The second clamping frame 8 forms a preliminary enclosure and limit on the cylinder from one side, while the first clamping frame 7, under the matching electric telescopic rod, cooperates with the second clamping frame 8 from the other side to surround and fix the cylinder. The cylinder is in a fixed and limited state at this time.

[0041] Then another set of hydraulic mechanisms, which are matched between the mounting base 15 and the second support platform 3, are activated, so that the contact roller 18 contacts the piston rod surface of the cylinder to be tested, and the two sets of misaligned outer limit plates 16 contact the piston rod surface from the outer side.

[0042] During the testing process, the contact roller 18 applies a lateral force to the piston rod of the cylinder to be tested under the control of another hydraulic mechanism. After the applied force reaches a certain required value, the pressure is stopped. Then, the hydraulic cylinder to be tested is started, the piston rod extends and retracts, and the contact roller 18 rolls while ensuring the applied force. Then, the piston rod is tested to see if it is qualified under the force.

[0043] Before the test begins, rotate the outer protective plate 4. The positioning support at the bottom of the outer protective plate 4 will be inserted into the limiting groove at the top of the second support platform 2 as the outer protective plate 4 rotates. The outer protective plate 4 protects the test area of ​​the piston rod.

[0044] Depending on the size of the piston rod, the user can adjust the width of the outer limit plate 16 using the miniature electric telescopic rod between the outer limit plate 16 and the mounting base 15.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A hydraulic cylinder performance testing fixture, comprising a base platform (1), wherein a first support platform (2) and a second support platform (3) are vertically connected to both ends of the base platform (1), characterized in that: The outer side of the top of the second support platform (3) is fixedly connected to an arc-shaped outer protective plate (4), and the top surface of the base platform (1) is provided with a transverse guide groove (5). The base assembly (6) is movably embedded in the guide groove (5). The inner surfaces of the first support platform (2) and the second support platform (3) are respectively connected to a first clamping frame (7) and a second clamping frame (8). The top of the inner side of the second support platform (3) is connected to a pressure application assembly (11). The base assembly (6) includes a base body (12) and an inner limiting airbag (13) inside it. An outer surrounding layer (14) is provided on the outside of the inner limiting airbag (13). The inner cavity of the base body (12) is a trapezoidal chamber with a larger upper part and a smaller lower part. The outer surrounding layer (14) is a conical elastic surrounding layer that matches the inner wall of the trapezoidal chamber. The pressure application assembly (11) includes a mounting base (15) and a contact roller (18) provided on its inner surface for contacting the piston rod. Both longitudinal sides of the mounting base (15) are connected to an outer limiting plate (16). The outer limiting plates (16) are staggered vertically along both sides of the longitudinal direction of the mounting base (15), and the outer limiting plates (16) and the mounting base (15) are connected by a miniature electric telescopic rod.

2. The hydraulic cylinder performance testing fixture according to claim 1, characterized in that: The outer protective plate (4) is made of transparent acrylic sheet. A set of positioning feet is provided on the bottom end of the outer protective plate (4) facing the first support platform (2). The top of the first support platform (2) is provided with a through-type limiting groove corresponding to the positioning feet in the outer protective plate (4). The outer protective plate (4) and the outer side of the second support platform (3) are connected by a shaft in a vertical position.

3. The hydraulic cylinder performance testing fixture according to claim 1, characterized in that: The inner wall of the guide groove (5) and the base body (12) are slidably connected by a linear guide rail, and the base body (12) and the guide groove (5) are connected by a set of electric telescopic rods.

4. The hydraulic cylinder performance testing fixture according to claim 1, characterized in that: The inner limiting airbag (13) is made of high-strength polyurethane coated fabric, and the surface of the airbag is provided with a layer of wear-resistant rubber. The outer surrounding layer (14) is made of high elasticity and high tear resistance silicone rubber layer, and a set of quick exhaust switches is provided on the top of the inner limiting airbag (13).

5. The hydraulic cylinder performance testing fixture according to claim 1, characterized in that: The outer side of the first clamping frame (7) and the first support platform (2) are connected by a set of transverse electric telescopic rods, and the outer side of the second clamping frame (8) and the second support platform (3) are connected by multiple sets of fixing buckles.

6. The hydraulic cylinder performance testing fixture according to claim 1, characterized in that: The first clamping frame (7) and the second clamping frame (8) are respectively fixedly connected to the inner side of the first clamping layer (9) and the second clamping layer (10). The inner surfaces of the first clamping layer (9) and the second clamping layer (10) are both arc-shaped and concave, and are also provided with a wear-resistant nylon layer.

7. The hydraulic cylinder performance testing fixture according to claim 1, characterized in that: The mounting base (15) has a support (17) for the corresponding contact roller (18) fixedly connected on both sides of its inner surface. The contact roller (18) is embedded in the support (17) in a longitudinal horizontal position. A deep groove ball bearing is provided in the support (17).

8. The hydraulic cylinder performance testing fixture according to claim 7, characterized in that: The surface of the contact roller (18) is provided with a polyurethane-coated anti-slip layer, and the contact roller (18) has a built-in pressure sensing mechanism.

9. The hydraulic cylinder performance testing fixture according to claim 1, characterized in that: The mounting base (15) is connected to the second support platform (3) via a hydraulic mechanism.

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