Oil cylinder testing device

Abstract

The utility model discloses a testing device of an oil cylinder, the oil cylinder comprises a cylinder body and a piston rod, the testing device comprises a test board, the test board is provided with a mounting part, and the mounting part can be connected with the cylinder body and is used for mounting the oil cylinder; the driving assembly comprises a pulling rope and a gravity driving part, one end of the pulling rope is connected with the piston rod, and the gravity driving part is hung at the other end of the pulling rope. According to the utility model, the piston rod is driven by the gravity driving piece and the pulling rope to stretch out and draw back so as to provide a load for the oil cylinder, and the original scheme of providing the load through an additional oil cylinder is replaced, so that the cost of the testing device is greatly reduced, the structure is simplified, and the testing device is suitable for oil cylinder testing with a smaller load change range.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oil cylinder especially relates to a testing arrangement of oil cylinder. BACKGROUND

[0002] Hydraulic cylinder is one of the hydraulic execution elements commonly used in the hydraulic transmission system, and its main function is to convert hydraulic energy into mechanical energy to realize the reciprocating linear motion of the moving part. In actual engineering, in order to ensure the stable and reliable performance of the oil cylinder, performance testing is essential during the design, production and manufacturing application process.

[0003] In order to provide stepless adjustable load, the common oil cylinder test bench usually matches a set of hydraulic system, controls the system pressure through the pressure control valve control system, matches several loading cylinders to provide load for the test cylinder, so as to complete the performance test of the oil cylinder.

[0004] As disclosed in the utility model patent with the publication number "CN214331061U" and the patent name "hydraulic cylinder test bench", it comprises a base, the base is respectively provided with a first mounting seat and a second mounting seat, a guide column is horizontally arranged between the first mounting seat and the second mounting seat, a connecting plate is slidably arranged on the guide column, a loading cylinder is connected to the left side of the first mounting seat, the piston rod of the loading cylinder is fixedly connected with the connecting plate, a test cylinder is arranged between the second mounting seat and the connecting plate, the cylinder barrel of the test cylinder is connected with the side of the second mounting seat, the piston rod of the test cylinder is fixedly connected with the connecting plate, a displacement sensor is arranged on the loading cylinder, and a pressure sensor is arranged on the loading cylinder; the hydraulic cylinder test bench further comprises a hydraulic oil source for providing power source for the hydraulic cylinder, and an upper computer for controlling the hydraulic oil source, reading sensor signals and outputting test results.

[0005] However, in the above scheme, the loading cylinder is used to apply load to the test cylinder to measure various parameters of the test cylinder, which requires the whole test device to provide a complete set of hydraulic system for the loading cylinder, resulting in a complex structure of the test device and high cost, which is not suitable for oil cylinder testing with small load change range. SUMMARY

[0006] In view of the above shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a testing device for an oil cylinder to solve the problems of complex structure and high cost of the oil cylinder testing device in the prior art.

[0007] The utility model solves the technical problems by adopting the technical scheme of a testing device for an oil cylinder, which comprises a cylinder body and a piston rod, and comprises:

[0008] A test bench is provided with a mounting portion, which can be connected with the cylinder body to install the oil cylinder.

[0009] a driving assembly, the driving assembly comprising a pulling rope and a gravity driving member, one end of the pulling rope being connected with the piston rod, the gravity driving member being hung on the other end of the pulling rope.

[0010] Further, a fixed pulley is arranged on the test bench, and the pulling rope is wound around the fixed pulley.

[0011] Further, the gravity driving member is one or more weights.

[0012] Further, the driving assembly comprises at least one first pulling rope and at least one second pulling rope, the first pulling rope being used to apply a force to the piston rod in the direction of extension of the piston rod, and the second pulling rope being used to apply a force to the piston rod in the direction of retraction of the piston rod.

[0013] Further, a guide plate is arranged on the test bench, the guide plate being slidable relative to the test bench in the direction of extension and retraction of the piston rod, the piston rod being detachably connected with the guide plate, and one end of the pulling rope away from the gravity driving member being connected with the guide plate.

[0014] Further, the guide plate has an abutment surface facing the test bench, the abutment surface being provided with a groove, and a plurality of rolling balls being rollingly arranged in the groove and abutting against the test bench.

[0015] Further, the guide plate comprises a first component plate and a second component plate which are detachably connected, the first component plate has a first surface on one side thereof, the first surface being provided with a first gap, the second component plate has a second surface on one side thereof, the second surface being provided with a second gap, and the first gap and the second gap form a fixing hole when the first surface abuts against the second surface.

[0016] The piston rod can extend into the fixing hole and be connected with the guide plate.

[0017] Further, the piston rod has a fixing section, and a baffle is arranged on each side of the fixing section, the fixing section can extend into the fixing hole, and the baffles can abut against the two sides of the guide plate, respectively.

[0018] Alternatively, the piston rod is recessed inwardly to form a recess, the recess can extend into the fixing hole, and the two side walls of the recess can abut against the two sides of the guide plate, respectively.

[0019] Further, the test bench comprises a table plate, the two ends of the guide plate respectively extend outwardly to extend sections, the extend sections can be connected with the upper surface of the table plate, the extend sections are bent downwardly to form first bent sections, the first bent sections can be connected with the side surface of the table plate, the first bent sections are bent inwardly to form second bent sections, the second bent sections can be connected with the lower surface of the table plate.

[0020] Compared with the prior art, the utility model has at least the following beneficial effects:

[0021] The piston rod is driven to extend and retract through the gravity driving part and the pulling rope, so as to provide load for the oil cylinder, replace the original scheme of providing load through an additional oil cylinder, greatly reduce the cost of the test device, simplify the structure, and be suitable for the oil cylinder test with small load change range. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic view of the test device in the embodiment;

[0023] Figure 2 It is a structural schematic view of the guide plate in the embodiment;

[0024] Figure 3 It is Figure 2 The local enlarged view of A in the figure;

[0025] In the figure:

[0026] 100, test bench; 110, table plate;

[0027] 120, mounting part; 200, guide plate; 201, fixed hole; 202, extend section; 203, first bent section; 204, second bent section; 205, groove; 206, ball;

[0028] 300, oil cylinder; 310, cylinder body; 320, piston rod;

[0029] 400, first pulling rope; 401, second pulling rope; 410, first connecting section; 420, second connecting section; 500, gravity driving part; 600, fixed pulley. DETAILED DESCRIPTION

[0030] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0031] Please refer to Figures 1-3 The utility model discloses a test device of oil cylinder, the oil cylinder 300 includes cylinder body 310 and piston rod 320, comprising:

[0032] A test bench 100 is provided with a mounting portion 120, which is connected with the cylinder body 310 and used to mount the oil cylinder 300;

[0033] A driving assembly is provided, which includes a pulling rope and a gravity driving member 500. One end of the pulling rope is connected with the piston rod 320, and the other end of the pulling rope is hung with the gravity driving member 500.

[0034] Specifically, the gravity driving member 500 drives the pulling rope to move, and the pulling rope drives the piston rod 320 to extend or contract, so as to realize the reciprocating movement of the piston rod 320 relative to the cylinder body 310, and further measure various parameters and performances of the oil cylinder 300.

[0035] Importantly, the piston rod 320 is driven to extend or contract by the gravity driving member 500 and the pulling rope, so as to provide a load for the oil cylinder 300, replace the original scheme of providing a load by an additional oil cylinder 300, greatly reduce the cost of the test device, simplify the structure, and be suitable for the test of the oil cylinder 300 with a small load change range.

[0036] It should be noted that the gravity driving member 500 refers to a component driven by its own gravity, which drives the pulling rope to move, and further drives the piston rod 320 to extend or contract. The pulling rope is not limited to a rope, and a chain or other components can be used to replace it, as long as the gravity of the gravity driving member 500 can be converted into a pulling force on the piston rod 320.

[0037] Further, the gravity driving member 500 is one or more weights.

[0038] Specifically, during the test, the number or weight of the weight hung on the pulling rope can be changed to adjust the pulling force of the pulling rope on the piston rod 320, so as to realize the adjustment of the load of the oil cylinder 300.

[0039] Further, the driving assembly includes at least one first pulling rope 400 and at least one second pulling rope 401. The first pulling rope 400 is used to apply a force to the piston rod 320 in the extending direction of the piston rod 320, and the second pulling rope 401 is used to apply a force to the piston rod 320 in the contracting direction of the piston rod 320.

[0040] Specifically, when the piston rod 320 is stretched, the weight of the weight at the end of the first pulling rope 400 is less than the weight of the weight at the end of the second pulling rope 401. At this time, the pulling force of the first pulling rope 400 on the piston rod 320 is less than the pulling force of the second pulling rope 401, the direction of the load on the piston rod 320 is toward the second pulling rope 401, and the load direction is opposite to the extending direction of the piston rod 320, so as to test the movement of the piston rod under the load.

[0041] When the piston rod 320 is retracted, the weight of the weight at the end of the first pulling rope 400 is greater than the weight of the weight at the end of the second pulling rope 401, at this time, the pulling force of the first pulling rope 400 on the piston rod 320 is greater than the pulling force of the second pulling rope 401, the direction of the load on the piston rod 320 is towards the first pulling rope 400, and the direction of the load is opposite to the retraction direction of the piston rod 320, so as to test the movement of the piston rod under load.

[0042] Further, the test bench 100 is further provided with a guide plate 200, the guide plate 200 can slide relative to the test bench 100 along the extension and retraction direction of the piston rod 320, the piston rod 320 and the guide plate 200 are detachably connected, and the end of the pulling rope away from the gravity driving part 500 is connected with the guide plate 200.

[0043] Specifically, the guide plate 200 is arranged to slide relative to the test bench 100, and the piston rod 320 and the pulling rope are connected on the guide plate 200 at the same time, so as to constrain the extension and retraction direction of the piston rod 320 through the guide plate 200, and avoid that the piston rod 320 is affected by the radial force caused by the swinging of the pulling rope. It can be seen that the arrangement of the guide plate 200 can make the piston rod 320 only bear axial tension, which is beneficial to improve the test precision.

[0044] Further, the test bench 100 is provided with a fixed pulley 600, and the pulling rope is wound on the fixed pulley 600. The pulling rope has a first connecting section 410 and a second connecting section 420 connected with each other, the first connecting section 410 is arranged along the extension and retraction direction of the piston rod 320, and the second connecting section 420 is arranged along the vertical direction.

[0045] Specifically, the test bench is arranged horizontally, and the oil cylinder is placed on the test bench and fixed. The part of the pulling rope from the fixed pulley 600 to the piston rod 320 is the first connecting section 410, the length direction of the first connecting section 410 is the same as the extension and retraction direction of the piston rod 320, so as to transmit the gravity of the gravity driving part 500 to the pulling force on the piston rod 320 when pulling the piston rod 320, without converting into other directional component forces, and the piston rod 320 only bears axial force, so that the load of the oil cylinder 300 is easier to control, and the test result is more accurate. The part of the pulling rope from the fixed pulley 600 to the gravity driving part 500 is the second connecting section 420, the second connecting section 420 naturally falls under the action of the gravity of the gravity driving part 500, and is arranged in the vertical direction, so that the pulling force on the pulling rope only comes from the gravity of the gravity driving part 500, and is not disturbed by other factors, so that the test is easier to control.

[0046] Further, the guide plate 200 has an abutment surface facing the test table 100, the abutment surface is provided with a groove 205, a plurality of rolling balls 206 are rollingly arranged in the groove 205, and the rolling balls 206 can be in contact with the test table 100.

[0047] Specifically, the groove 205 is provided on the abutment surface, and the rolling balls 206 are arranged in the groove 205, and the rolling balls 206 are in contact with the test table 100. The advantage of this arrangement is that when the guide plate 200 slides relative to the test table 100, the rolling balls 206 can slide in the groove 205, so that the friction between the guide plate 200 and the test table 100 is converted from sliding friction to rolling friction, thereby reducing the friction when the guide plate 200 slides, and further reducing the error caused by the sliding friction of the guide plate 200.

[0048] Further, the guide plate 200 includes a first component plate and a second component plate which are detachably connected, the first component plate has a first surface facing one side of the first component plate, the first surface is provided with a first gap, the second component plate has a second surface facing one side of the first component plate, and the second surface is provided with a second gap; when the first surface and the second surface are in contact, the first gap and the second gap form a fixing hole 201;

[0049] The piston rod 320 can extend into the fixing hole 201 and be connected with the guide plate 200.

[0050] Specifically, the guide plate 200 is divided into two component plates, and the fixing hole 201 for connecting with the piston rod 320 is formed by the gaps on the two component plates, so as to facilitate the connection and disconnection of the piston rod 320 and the guide plate 200.

[0051] Further, the piston rod 320 has a fixing section, and a baffle is arranged on each side of the fixing section, the fixing section can extend into the fixing hole 201, and the two baffles can abut against the two sides of the guide plate 200, respectively.

[0052] Alternatively, the piston rod 320 is recessed inwardly to form a recessed portion, the recessed portion can extend into the fixing hole 201, and the two side walls of the recessed portion can abut against the two sides of the guide plate 200, respectively.

[0053] Specifically, as to the arrangement of the connection structure of the piston rod 320 and the guide plate 200, two baffles can be arranged on the piston rod 320, the region between the two baffles is a fixing section which can extend into the fixing hole 201, and the two baffles abut against the two sides of the guide plate 200, respectively, so as to limit the piston rod 320 and realize the connection of the piston rod 320 and the guide plate 200.

[0054] Of course, a recess can also be arranged on the piston rod 320, the recess is connected with the fixing hole 201, two side walls of the recess have the same effect as the two baffles, and the two side walls can be respectively abutted against the two side walls of the guide plate 200 to limit the piston rod 320.

[0055] Based on the above, a thread can also be arranged on the piston rod, and a connecting piece with a threaded hole is arranged, two baffles are arranged on the connecting piece, the connecting piece is threadedly connected on the piston rod, and the two baffles on the connecting piece are respectively abutted against the two sides of the guide plate, so that the connection of the piston rod and the guide plate can also be achieved.

[0056] Further, the test bench 100 comprises a table plate 110, two ends of the guide plate 200 respectively extend outwardly to extend sections 202, the extend sections 202 can be connected with the upper surface of the table plate 110, the extend sections 202 are downwardly bent to form first bent sections 203, the first bent sections 203 can be connected with the side surface of the table plate 110, and the first bent sections 203 are inwardly bent to form second bent sections 204, the second bent sections 204 can be connected with the lower surface of the table plate 110.

[0057] Specifically, the extend sections 202, the first bent sections 203 and the second bent sections 204 are connected with the upper surface, the side surface and the lower surface of the table plate 110 respectively, so that the guide plate 200 is prevented from shaking and tilting during sliding, and the sliding direction of the guide plate 200 is limited.

[0058] It should be noted that all the directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0059] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0060] In the utility model, unless another definite provision and limitation, the term "connect", "fix" and so on should do the broad sense understanding, for example, "fix" can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two element inside's intercommunication or two element's mutual action relation, unless another definite limitation.For the ordinary skill in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific circumstances.

[0061] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the present application.

Claims

1. A testing device for a hydraulic cylinder, the hydraulic cylinder comprising a cylinder body and a piston rod, characterized in that, include: A test bench, wherein the test bench is provided with a mounting part, the mounting part being able to connect with the cylinder body for mounting the hydraulic cylinder; A drive assembly, comprising a pull rope and a gravity drive component, wherein one end of the pull rope is connected to the piston rod and the gravity drive component is suspended from the other end of the pull rope.

2. The testing device for a hydraulic cylinder according to claim 1, characterized in that, A fixed pulley is provided on the test stand, and the pulling rope is wound around the fixed pulley.

3. The testing device for a hydraulic cylinder according to claim 1, characterized in that, The gravity driving component is one or more weights.

4. The testing device for a hydraulic cylinder according to claim 1, characterized in that, The drive assembly includes at least one first pull rope and at least one second pull rope. The first pull rope is used to apply a force to the piston rod in the direction of piston rod extension, and the second pull rope is used to apply a force to the piston rod in the direction of piston rod retraction.

5. The testing device for a hydraulic cylinder according to claim 1, characterized in that, A guide plate is also provided on the test stand. The guide plate can slide relative to the test stand along the extension and retraction direction of the piston rod. The piston rod is detachably connected to the guide plate. The end of the pulling rope away from the gravity drive component is connected to the guide plate.

6. The testing device for a hydraulic cylinder according to claim 5, characterized in that, The guide plate has a connecting surface facing the test platform. The connecting surface has a groove, and a plurality of balls are rotatably disposed in the groove. The balls can connect with the test platform.

7. The testing device for a hydraulic cylinder according to claim 5, characterized in that, The guide plate includes a first component plate and a second component plate that are detachably connected. The first component plate has a first surface facing the first component plate and a first notch is formed on the first surface. The second component plate has a second surface facing the first component plate and a second notch is formed on the second surface. When the first surface and the second surface are in contact, the first notch and the second notch together form a fixing hole. The piston rod can extend into the fixing hole and connect to the guide plate.

8. The testing device for a hydraulic cylinder according to claim 7, characterized in that, The piston rod has a fixed section, and a baffle is provided on each side of the fixed section. The fixed section can extend into the fixed hole, and the two baffles can respectively abut against the two sides of the guide plate. Alternatively, the piston rod may be recessed inward to form a recessed portion, which may extend into the fixing hole, and the two side walls of the recessed portion may respectively abut against the two sides of the guide plate.

9. The testing device for a hydraulic cylinder according to claim 5, characterized in that, The test platform includes a plate, with extension sections extending outward from both ends of the guide plate. The extension sections can connect with the upper surface of the plate. The extension sections are bent downward to form a first bending section, which can connect with the side of the plate. The first bending section is bent inward to form a second bending section, which can connect with the lower surface of the plate.

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