Oil cylinder loading test device

Abstract

An oil cylinder loading test device comprises an oil cylinder, a damping assembly, a pressure head and a base, the damping assembly is located above the position, where a test piece is placed, of the base, the pressure head is installed in the damping assembly, the oil cylinder is erected above the damping assembly, and a piston rod of the oil cylinder stretches out towards the damping assembly and is connected with a pressure sensor. The damping assembly comprises a damping shell, a belleville spring set and a wave spring, an installation space in the damping shell is opened in the upper end face of the damping shell, a pressing head via hole is formed in the bottom face of the installation space, a pressing head is arranged in the installation space in a sliding mode, the lower end of the pressing head can stretch out through the pressing head via hole, a top plate is arranged on the top of the pressing head, and the belleville spring set is arranged on the top plate. The wave spring is arranged on the pressing head in a sleeving mode and located between the pressing head top plate and the bottom face of the installation space. According to the device, the belleville spring and the wave spring are matched for use, so that the high bearing capacity of the loading damping is ensured, the pressure head has the capability of automatically rebounding, and a test piece is convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model belongs to the field of mechanical parts testing, and in particular relates to an oil cylinder loading test device. Background Art

[0002] In the field of component testing, for large-load, short-stroke cylinder loading components, a spring damping assembly and a pressure head are installed at the front end of the cylinder rod. When the test piece is replaced after the test, the pressure head will fall with gravity, making it difficult to replace the test piece. Utility Model Content

[0003] The utility model aims to provide a cylinder loading test device, which ensures high load-bearing capacity of loading damping through the coordinated use of disc springs and wave springs, while enabling the pressure head to have the ability of automatic rebound, thereby facilitating the disassembly and assembly of the test piece.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: a cylinder loading test device, comprising a cylinder, a cylinder fixing part, a damping assembly, a pressure head and a base, the damping assembly is mounted on the base and is located above the position where the test piece is placed on the base, the pressure head is installed in the damping assembly, the cylinder is mounted above the damping assembly through the cylinder fixing part, the cylinder piston rod extends toward the damping assembly, the pressure sensor is installed on the cylinder piston rod, the damping assembly comprises a damping housing, a disc spring group and a wave spring, an installation space is provided in the damping housing, the top of the installation space is opened at the upper end surface of the damping housing, a pressure head through hole is provided on the bottom surface of the installation space, the pressure head is slidably arranged in the installation space, the lower end of the pressure head can extend through the pressure head through hole, a top plate is provided on the top of the pressure head, the disc spring group is arranged on the top plate and is opposite to the top opening of the installation space, the wave spring is sleeved on the pressure head and is located between the top plate of the pressure head and the bottom surface of the installation space.

[0005] The beneficial effect is that the wave spring under the pressure head of the device can push the pressure head to rebound after the test is completed, thereby preventing the pressure head from sagging due to its own weight, thereby facilitating the replacement of the test piece under the pressure head.

[0006] The periphery of the top plate of the pressure head is in sliding contact with the inner wall of the installation space.

[0007] The beneficial effect is that the top plate of the pressure head slides along the inner wall of the installation space of the damping shell, which can provide guidance for the movement of the pressure head and prevent the pressure head from tilting and getting stuck.

[0008] The disc spring group includes a plurality of disc springs stacked in the same direction.

[0009] The beneficial effect is that the device adopts the method of superimposing disc springs in the same direction to minimize the size of the loading damping, and through the cooperation of the disc spring and the wave spring, the function of stable load and automatic rebound of the pressure head is achieved without destroying the structure of the pressure head body.

[0010] The oil cylinder piston rod and the pressure sensor are connected via a connecting nut.

[0011] The beneficial effect is that an indirect connection method between the oil cylinder piston rod and the pressure sensor is proposed.

[0012] The connecting nut has an internal thread and an external thread with opposite rotation directions. The end face of the cylinder piston rod is provided with a connecting threaded hole for connecting with the external thread of the connecting nut. The top of the pressure sensor is provided with a threaded connector for connecting with the internal thread of the connecting nut.

[0013] The beneficial effect is that the internal thread and the external thread of the connecting nut have opposite rotation directions, and the position of the pressure sensor can be adjusted by rotating the connecting nut without disassembling the oil cylinder, thereby meeting the testing needs of different test pieces.

[0014] The end surface of the oil cylinder piston rod is provided with a connecting threaded hole, and the top of the pressure sensor is provided with a threaded connector that can cooperate with the connecting threaded hole.

[0015] The beneficial effect is that a method of directly connecting the oil cylinder piston rod and the pressure sensor is proposed.

[0016] A sensor transition piece is installed at the lower end of the pressure sensor. The sensor transition piece is located directly above the disc spring group. The diameter of the lower end surface of the sensor transition piece is larger than the inner diameter of the disc spring group.

[0017] The beneficial effect is that the pressure sensor can be prevented from directly contacting the disc spring assembly, thereby reducing the wear on the pressure sensor.

[0018] The cylinder fixing member includes a cylinder fixing column and a cylinder mounting plate, the cylinder mounting plate is fixed on the top of the damping shell, the cylinder fixing column is fixed on the cylinder mounting plate at intervals along the circumferential direction, and the piston end face of the cylinder body is fixedly supported on the top of the cylinder fixing column.

[0019] The beneficial effects are as follows: the circumferential spacing of the cylinder fixing columns facilitates the passage of the sensor cable of the pressure sensor between the cylinder fixing columns, and also facilitates visual observation of components such as the cylinder piston rod, pressure sensor, and sensor cable from between the cylinder fixing columns, so as to promptly discover faults such as jamming during operation.

[0020] A passage hole for the pressure sensor to pass through is arranged at the center of the oil cylinder mounting plate.

[0021] The beneficial effect is that it is convenient for the oil cylinder to apply pressure downward.

[0022] The base comprises a bottom plate and a plurality of support columns perpendicular to the bottom plate. The plurality of support columns are fixed on the bottom plate at intervals along the circumferential direction, and the bottom of the damping shell is fixed on the top of the support columns.

[0023] The beneficial effect is that a test space is provided for placing the test piece.

[0024] The beneficial effect of the utility model is that the utility model uses the wave spring under the pressure head to push the pressure head back after the test is completed, so as to prevent the pressure head from sagging due to its own weight, thereby facilitating the replacement of the test piece under the pressure head. The utility model adopts the method of superimposing the disc springs in the same direction to minimize the size of the loading damping, and through the cooperation of the disc spring and the wave spring, the functions of stable load and automatic rebound of the pressure head are achieved without destroying the structure of the pressure head body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the structure of the utility model;

[0027] Figure 2 for Figure 1 NN cross-sectional view;

[0028] Markings in the figure: 1. Cylinder, 2. Cylinder piston rod, 3. Pressure sensor, 4. Cylinder fixing column, 5. Cylinder mounting plate, 6. Damping shell, 7. Support column, 8. Test piece, 9. Base plate, 10. Connecting nut, 11. Sensor transition piece, 12. Disc spring group, 13. Wave spring, 14. Pressure head, 15. Installation space, 16. Pressure head through hole. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention in any way.

[0030] like Figure 1 , 2 As shown, a cylinder loading test device includes a cylinder 1, a pressure sensor 3, a sensor transition piece 11, a damping assembly, a pressure head 14 and a base.

[0031] The base includes a bottom plate 9 and a plurality of support columns 7 vertically fixed on the bottom plate 9, the plurality of support columns 7 are arranged at intervals in the circumferential direction, the damping assembly includes a damping shell 6 and an elastic member arranged in the damping shell 6, the damping shell 6 is supported and fixed above the support columns 7, the upper end surface of the damping shell 6 is fixedly connected to the cylinder mounting plate 5, a plurality of cylinder fixing columns 4 arranged at intervals in the circumferential direction are arranged on the cylinder mounting plate 5, and the piston end surface of the cylinder body of the cylinder 1 is fixedly supported on the top of the cylinder fixing column 4.

[0032] The setting of the cylinder fixing column 4 raises the test cylinder 1 to a certain height to facilitate the installation of the pressure sensor 3 at the end of the cylinder piston rod 2, and the cylinder fixing columns 4 are arranged at intervals along the circumferential direction. While ensuring the stability of the cylinder 1, the cylinder piston rod 2, the pressure sensor 3, the sensor cable and other components can be visually observed from between the cylinder fixing columns 4, so as to promptly discover faults such as jamming during operation.

[0033] The support column 7 raises the damping assembly to a certain height, and forms a test space for placing the test piece 8 between the support column 7 and the bottom plate 9, and provides space for the downward pressing activity of the pressure head 14.

[0034] The end surface of the oil cylinder piston rod 2 is processed with a connecting threaded hole, and the top of the pressure sensor 3 is provided with a threaded connector, the threaded connector of the pressure sensor 3 is connected to the internal thread of the connecting nut 10, and the external thread of the connecting nut 10 is connected to the connecting threaded hole of the oil cylinder piston rod 2, thereby realizing an adjustable connection between the pressure sensor 3 and the oil cylinder piston rod 2. The external thread of the connecting nut 10 is reverse-rotating and the internal thread is forward-rotating, so the position of the pressure sensor 3 can be adjusted by rotating the connecting nut 10 without disassembling the oil cylinder 1.

[0035] Alternatively, when there is no need to adjust the position of the pressure sensor 3, the connecting nut 10 may no longer be used. Instead, the threaded connector of the pressure sensor 10 and the connecting threaded hole of the cylinder piston rod 2 may be arranged to be a matching structure, and the two may be threadedly connected.

[0036] Furthermore, a sensor transition piece 11 is fixedly mounted on the lower end surface of the pressure sensor 3 to prevent the pressure sensor 3 from directly acting on the structural parts below, thereby protecting the pressure sensor 3 .

[0037] A passage hole for the sensor transition piece 11 to pass through is provided at the center of the oil cylinder mounting plate 5 , and the aperture of the passage hole is larger than the diameter of the sensor transition piece 11 .

[0038] The center of the damping housing 6 is provided with an installation space 15 that runs through from top to bottom, and the elastic member and the pressure head 14 are arranged in the installation space 15. The lower end of the pressure head 14 extends downward from the damping housing 6 from the pressure head through hole 16 at the bottom of the installation space 15, and the upper end of the pressure head 14 is provided with a top plate that matches the inner diameter of the installation space 15. During the up and down movement of the pressure head 14, the edge of the top plate slides in contact with the inner wall of the installation space 15 to provide guidance for the pressure head 14. The elastic member includes a disc spring group 12 and a wave spring 13. The disc spring group 12 is supported on the top plate at the upper end of the pressure head 14. The wave spring 13 is sleeved on the pressure head 14 and is located between the top plate and the bottom surface of the installation space 15. The diameter of the wave spring 13 is larger than the aperture of the pressure head through hole 16.

[0039] During the test, the test piece 8 is placed under the pressure head 14, the oil cylinder 1 is started, the oil cylinder piston rod 2 is extended, the sensor transition piece 11 acts on the disc spring group 12, and the disc spring group 12 pushes the pressure head 14 downward, exerting a certain loading force on the test piece 8. At this time, the wave spring 13 is compressed between the top plate of the pressure head 14 and the bottom plate of the installation space 15. After the test is completed, the oil cylinder piston rod 2 retracts, the squeezing force of the disc spring group 12 on the pressure head 14 disappears, and the elastic force of the wave spring 13 is released, and the pressure head 14 is lifted and reset to prevent the pressure head 14 from sagging due to its own weight, thereby facilitating the replacement of the test piece 8 below.

[0040] Optionally, in other embodiments, the sensor transition piece may not be provided. In this case, as long as the diameter of the pressure sensor housing is larger than the inner diameter of the disc spring group 12 and smaller than the diameter of the channel hole of the cylinder mounting plate 5, the cylinder piston rod 2 is pressed downward, and the pressure sensor 3 directly acts on the disc spring group 12, thereby pushing the pressure head 14 downward.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can be modified or replaced by equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A cylinder loading test device, comprising a cylinder, a cylinder fixing, a damping assembly, a pressure head and a base, wherein the damping assembly is mounted on the base and is located above the position where the test piece is placed on the base, the pressure head is installed in the damping assembly, the cylinder is mounted above the damping assembly through the cylinder fixing, the cylinder piston rod extends toward the damping assembly, and the pressure sensor is installed on the cylinder piston rod, characterized in that: The damping assembly includes a damping shell, a disc spring group and a wave spring. An installation space is provided in the damping shell. The top of the installation space is opened at the upper end surface of the damping shell. A pressure head through hole is provided on the bottom surface of the installation space. The pressure head is slidably arranged in the installation space. The lower end of the pressure head can extend through the pressure head through the pressure head through the hole. A top plate is provided on the top of the pressure head. The disc spring group is arranged on the top plate and is opposite to the top opening of the installation space. The wave spring is sleeved on the pressure head and is located between the top plate of the pressure head and the bottom surface of the installation space.

2. The oil cylinder loading test device according to claim 1, characterized in that: The periphery of the top plate of the pressure head is in sliding contact with the inner wall of the installation space.

3. The oil cylinder loading test device according to claim 1, characterized in that: The disc spring group includes a plurality of disc springs stacked in the same direction.

4. The oil cylinder loading test device according to claim 1, characterized in that: The oil cylinder piston rod and the pressure sensor are connected via a connecting nut.

5. The oil cylinder loading test device according to claim 4, characterized in that: The connecting nut has an internal thread and an external thread with opposite rotation directions. The end face of the cylinder piston rod is provided with a connecting threaded hole for connecting with the external thread of the connecting nut. The top of the pressure sensor is provided with a threaded connector for connecting with the internal thread of the connecting nut.

6. The oil cylinder loading test device according to claim 1, characterized in that: The end surface of the oil cylinder piston rod is provided with a connecting threaded hole, and the top of the pressure sensor is provided with a threaded connector that can cooperate with the connecting threaded hole.

7. The oil cylinder loading test device according to claim 1, characterized in that: A sensor transition piece is installed at the lower end of the pressure sensor. The sensor transition piece is located directly above the disc spring group. The diameter of the lower end surface of the sensor transition piece is larger than the inner diameter of the disc spring group.

8. The oil cylinder loading test device according to claim 1, characterized in that: The cylinder fixing member includes a cylinder fixing column and a cylinder mounting plate, the cylinder mounting plate is fixed on the top of the damping shell, the cylinder fixing column is fixed on the cylinder mounting plate at intervals along the circumferential direction, and the piston end face of the cylinder body is fixedly supported on the top of the cylinder fixing column.

9. The oil cylinder loading test device according to claim 8, characterized in that: A passage hole for the pressure sensor to pass through is arranged at the center of the oil cylinder mounting plate.

10. The oil cylinder loading test device according to claim 1, characterized in that: The base comprises a bottom plate and a plurality of support columns perpendicular to the bottom plate, the plurality of support columns are fixed on the bottom plate at intervals along the circumferential direction, and the bottom of the damping shell is fixed on the top of the support column.

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