阅读说明：本技术 液压缸行程末端缓冲性能试验装置及试验方法 (Hydraulic cylinder stroke end buffering performance testing device and testing method ) 是由 李永奇 李小明 王伟伟 刘庆教 张义春 汤宝石 于 2020-05-21 设计创作，主要内容包括：本发明公开了一种液压缸行程末端缓冲性能试验装置及试验方法。液压缸行程末端缓冲性能试验装置包括台架、第一安装座、曲臂和检测装置,第一安装座设置于台架上并被配置为安装试验液压缸的缸筒,曲臂可转动地连接于台架上并与试验液压缸的活塞杆铰接以驱动活塞杆在设定行程内往复运动,检测装置被配置为实时监测试验液压缸在设定行程内的参数变化。本发明的液压缸行程末端缓冲性能试验装置通过利用转动的曲臂来驱动试验液压缸的活塞杆运动,这与实际工况中液压缸的驱动模式是基本相同的,因此能更好地模拟液压缸的实际运动状态。(The invention discloses a device and a method for testing the stroke tail end buffering performance of a hydraulic cylinder. The hydraulic cylinder stroke end buffering performance test device comprises a rack, a first mounting seat, a crank arm and a detection device, wherein the first mounting seat is arranged on the rack and configured to be a cylinder barrel for mounting the test hydraulic cylinder, the crank arm is rotatably connected to the rack and hinged to a piston rod of the test hydraulic cylinder to drive the piston rod to reciprocate in a set stroke, and the detection device is configured to monitor parameter changes of the test hydraulic cylinder in the set stroke in real time. The device for testing the buffer performance of the stroke end of the hydraulic cylinder drives the piston rod of the hydraulic cylinder to move by utilizing the rotating crank arm, and the device is basically the same as the driving mode of the hydraulic cylinder in the actual working condition, so that the actual motion state of the hydraulic cylinder can be better simulated.)

1. The utility model provides a terminal shock-absorbing capacity test device of pneumatic cylinder stroke which characterized in that includes:

a stage (8);

a first mounting seat (1) arranged on the bench (8) and configured to mount a cylinder of a test hydraulic cylinder (2);

the crank arm (3) is rotatably connected to the rack (8) and hinged with a piston rod of the test hydraulic cylinder (2) to drive the piston rod to reciprocate within a set stroke; and

the detection device is configured to monitor the parameter change of the test hydraulic cylinder (2) in the set stroke in real time.

2. The device for testing the damping performance at the end of a stroke of a hydraulic cylinder according to claim 1, wherein the first mounting base (1) is movably arranged relative to the stand (8).

3. The device for testing the damping performance at the tail end of the stroke of the hydraulic cylinder according to claim 1, wherein the crank arm (3) is provided with at least two hinged seats, and the piston rod is selectively hinged with one of the at least two hinged seats.

4. The device for testing the damping performance of the stroke end of the hydraulic cylinder according to claim 1, wherein the device further comprises a load hydraulic cylinder (6), a cylinder barrel of the load hydraulic cylinder (6) is connected with the rack (8), and a piston rod of the load hydraulic cylinder (6) is connected with the crank arm (4).

5. The device for damping the end of stroke of a hydraulic cylinder according to claim 4, characterized in that the test device further comprises a second mounting base (7) movably arranged on the stand (8), and the cylinder barrel of the load-carrying hydraulic cylinder (6) is connected to the second mounting base (7).

6. The device for testing the damping performance at the end of a stroke of a hydraulic cylinder according to claim 1, characterized in that the detection device is configured to detect a change in the speed of the piston rod of the test hydraulic cylinder (2) and/or a change in the pressure in the cylinder bore of the test hydraulic cylinder (2).

7. The device for testing the damping performance at the stroke end of the hydraulic cylinder is characterized by comprising an angle sensor (4), wherein the angle sensor (4) monitors the rotation angle of the crank arm (3) in real time and obtains the speed change of a piston rod of the test hydraulic cylinder (2) according to the rotation angle; and/or the detection device comprises a pressure sensor which is arranged in a cylinder barrel of the test hydraulic cylinder (2).

8. A method for testing the damping performance of the stroke end of a hydraulic cylinder based on the test device of any one of claims 1 to 7 is characterized by comprising the following steps:

mounting a cylinder barrel of the test hydraulic cylinder (2) on a rack (8) and connecting a piston rod of the test hydraulic cylinder (2) with the crank arm (3);

the crank arm (3) is controlled to rotate so as to drive a piston rod of the test hydraulic cylinder (2) to reciprocate within a set stroke; and

and monitoring the parameter change of the test hydraulic cylinder (2) in the set stroke.

9. The testing method according to claim 8, characterized in that the testing apparatus further comprises a first mounting base (1) movably arranged on the bench (8) and used for mounting the cylinder barrel of the testing hydraulic cylinder (2), and the testing method further comprises moving the first mounting base (1) according to testing hydraulic cylinders (2) of different sizes and mounting the cylinder barrel of the testing hydraulic cylinder (2) on the first mounting base (1).

10. The test method according to claim 8, further comprising adjusting the magnitude of the work load experienced by the test cylinder (2) during the reciprocating movement of the test cylinder (2) within the set stroke.

11. The test method according to claim 10, wherein the test device further comprises a load hydraulic cylinder (6) and a second mounting seat (7) movably arranged on the rack (8), a cylinder barrel of the load hydraulic cylinder (6) is connected to the second mounting seat (7), a piston rod of the load hydraulic cylinder (6) is connected with the crank arm (4), and the test method further comprises adjusting the output force of the load hydraulic cylinder (6) to adjust the size of the working load applied to the test hydraulic cylinder (2).

Technical Field

The invention relates to the technical field of hydraulic cylinder performance tests, in particular to a hydraulic cylinder stroke tail end buffering performance test device and a test method.

Background

The engineering machinery hydraulic cylinder with high movement speed needs to be provided with a buffer device at the tail end of a stroke, and can protect the hydraulic cylinder and a host structure from overlarge impact load, so that the reliability of a product is improved, and the service life of the product is prolonged. Common construction machines with a buffer device include excavators, loaders, and the like.

The buffer device is used as a self-protection device at the stroke end of the high-speed moving hydraulic cylinder, and the performance and the reliability of the buffer device are higher and higher for users. If the buffering performance is poor, the piston collides with the guide sleeve or the cylinder bottom when the hydraulic cylinder moves to the tail end of the stroke, abnormal abrasion or fatigue failure of parts is caused to the hydraulic cylinder, the reliability and the service life of a product are influenced, the operation experience of a user is influenced, and abnormal sounds such as vibration and impact occur or the whole machine shakes. On the contrary, if the buffer performance is too high, the running speed at the stroke end is slow, and the working efficiency is influenced. Therefore, it is important to test the damping performance of the hydraulic cylinder before shipping, but no device specially used for testing the damping performance of the hydraulic cylinder exists in the market at present.

Disclosure of Invention

The invention aims to provide a device and a method for testing the stroke tail end buffering performance of a hydraulic cylinder, so as to test the buffering performance of the hydraulic cylinder.

The invention provides a hydraulic cylinder stroke end buffering performance test device in a first aspect, which comprises:

a rack;

a first mounting seat arranged on the bench and configured to mount a cylinder of the test hydraulic cylinder;

the crank arm is rotatably connected to the rack and is hinged with a piston rod of the test hydraulic cylinder so as to drive the piston rod to reciprocate within a set stroke; and

and the detection device is configured to monitor the parameter change of the test hydraulic cylinder within the set stroke in real time.

In some embodiments, the first mount is movably disposed relative to the gantry.

In some embodiments, at least two hinge seats are provided on the crank arm, and the piston rod is selectively hinged to one of the at least two hinge seats.

In some embodiments, the test device further comprises a load hydraulic cylinder, a cylinder barrel of the load hydraulic cylinder is connected with the rack, and a piston rod of the load hydraulic cylinder is connected with the crank arm.

In some embodiments, the test apparatus further comprises a second mounting block movably disposed on the stand, the cylinder of the load cylinder being connected to the second mounting block.

In some embodiments, the detection device is configured to detect a change in speed of a piston rod of the test hydraulic cylinder and/or a change in pressure within a bore of the test hydraulic cylinder.

In some embodiments, the detection device comprises an angle sensor, and the angle sensor monitors the rotation angle of the crank arm in real time and obtains the speed change of the piston rod of the test hydraulic cylinder according to the rotation angle; and/or the detection device comprises a pressure sensor which is arranged in a cylinder barrel of the test hydraulic cylinder.

The second aspect of the invention provides a method for testing the stroke end buffering performance of a hydraulic cylinder based on the testing device of the first aspect of the invention, which comprises the following steps:

mounting a cylinder barrel of the test hydraulic cylinder on the rack and connecting a piston rod of the test hydraulic cylinder with the crank arm;

the crank arm is controlled to rotate so as to drive a piston rod of the test hydraulic cylinder to reciprocate within a set stroke; and

and monitoring the parameter change of the test hydraulic cylinder in the set stroke.

In some embodiments, the testing apparatus further comprises a first mounting base movably disposed on the stand and configured to mount a cylinder barrel of the testing hydraulic cylinder, and the testing method further comprises moving the first mounting base according to different sizes of the testing hydraulic cylinders and mounting the cylinder barrel of the testing hydraulic cylinder on the first mounting base.

In some embodiments, the testing method further comprises adjusting the magnitude of the work load on the test hydraulic cylinder during the reciprocating motion of the test hydraulic cylinder within the set stroke.

In some embodiments, the test device further comprises a load hydraulic cylinder and a second mounting seat movably arranged on the rack, a cylinder barrel of the load hydraulic cylinder is connected to the second mounting seat, a piston rod of the load hydraulic cylinder is connected with the crank arm, and the test method further comprises the step of adjusting the output force of the load hydraulic cylinder so as to adjust the size of the working load borne by the test hydraulic cylinder.

The hydraulic cylinder stroke end buffering performance test device comprises a rack, a first mounting seat, a crank arm and a detection device, wherein the first mounting seat is arranged on the rack and is configured to be used for mounting a cylinder barrel of a test hydraulic cylinder, the crank arm is rotatably connected to the rack and is hinged with a piston rod of the test hydraulic cylinder to drive the piston rod to reciprocate within a set stroke, and the detection device is configured to monitor parameter changes of the test hydraulic cylinder within the set stroke in real time. The device for testing the buffer performance of the stroke end of the hydraulic cylinder drives the piston rod of the hydraulic cylinder to move by utilizing the rotating crank arm, and the device is basically the same as the driving mode of the hydraulic cylinder in the actual working condition, so that the actual motion state of the hydraulic cylinder can be better simulated. The test device controls the test hydraulic cylinder to reciprocate in the interval from the approach of the buffer device to the end of buffering through the crank arm so as to test the performance of the buffer device of the test hydraulic cylinder.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a hydraulic cylinder stroke end buffering performance testing device according to an embodiment of the invention;

each reference numeral represents:

1. a first mounting seat;

2. testing the hydraulic cylinder;

3. a crank arm; 31. a first hinge mount; 32. a second hinge mount;

4. an angle sensor;

5. a crank arm mounting base;

6. a load hydraulic cylinder;

7. a second mounting seat;

8. a gantry.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously positioned and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1, the device for testing the stroke end cushioning performance of the hydraulic cylinder according to the embodiment of the present invention includes:

a stage 8;

a first mounting seat 1 provided on the bench 8 and configured to mount a cylinder of the test hydraulic cylinder 2;

the crank arm 3 is rotatably connected to the rack 8 and is hinged with a piston rod of the test hydraulic cylinder 2 so as to drive the piston rod to reciprocate within a set stroke; and

and the detection device is configured to monitor the parameter change of the test hydraulic cylinder 2 in the set stroke in real time.

The device for testing the buffer performance of the stroke end of the hydraulic cylinder drives the piston rod of the hydraulic cylinder 2 to move by utilizing the rotating crank arm 3, and the mode is basically the same as the driving mode of the hydraulic cylinder 2 in the actual working condition, so that the actual motion state of the hydraulic cylinder can be better simulated.

The crank arm 3 of the present embodiment is used to simulate a main machine for driving a hydraulic cylinder in an actual working machine. The end of the crank arm 3 is mounted on the stand 8 by a crank arm mounting base 5. The crank arm 3 drives the piston rod of the test hydraulic cylinder 2 to reciprocate within a set stroke, wherein the set stroke refers to a period from the approach of the damping device to the end of damping. The test device provided by the embodiment of the invention controls the test hydraulic cylinder to reciprocate in the interval from the approach of the buffer device to the end of buffering through the crank arm so as to test the performance of the buffer device of the test hydraulic cylinder. And the reciprocating motion is carried out in the set stroke, so that the whole stroke is saved, and the test efficiency is improved.

In order to adapt the test apparatus of the present embodiment to test hydraulic cylinders of different sizes, the first mount 1 of the present embodiment is movably arranged with respect to the stand 8. In the actual test process, the position of the first mounting seat 1 is adjusted so that test hydraulic cylinders with different sizes can be mounted between the stand 8 and the crank arm 3.

Further, in order to better accommodate test cylinders of different lengths, the crank arm 3 of the present embodiment is provided with at least two hinge seats, and the piston rod is selectively hinged to one of the at least two hinge seats. As shown in fig. 1, the crank arm 3 of the present embodiment is provided with a first hinge seat 31 and a second hinge seat 32, so that the two hinge seats at different positions and the movable first mounting seat 1 are coordinated together to adapt to test hydraulic cylinders with different lengths.

In other embodiments not shown in the drawings, more than three articulated seats may be provided on the crank arm.

The testing device of the embodiment further comprises a load hydraulic cylinder 6, a cylinder barrel of the load hydraulic cylinder 6 is connected with the rack 8, and a piston rod of the load hydraulic cylinder 6 is connected with the crank arm 4.

The testing device of the embodiment further comprises a second mounting base 7 movably arranged on the stand 8, and the cylinder barrel of the load hydraulic cylinder 6 is connected to the second mounting base 7. By adjusting the output force of the load hydraulic cylinder 6, controllable working load is provided for the test hydraulic cylinder 2 to simulate the actual working load of the test hydraulic cylinder 2, and the test accuracy is improved. And the position of the second mounting seat 7 for mounting the load hydraulic cylinder 6 on the rack 8 can also move left and right, so that the requirements of different loads are met.

The detection device of the present embodiment is configured to detect a speed change of the piston rod of the test cylinder 2 and a pressure change in the cylinder tube of the test cylinder 2.

Specifically, the detection device of the present embodiment includes an angle sensor 4, and the angle sensor 4 monitors the rotation angle of the crank arm 3 in real time and obtains the speed change of the piston rod of the test hydraulic cylinder 2 according to the rotation angle. And the detection device of this embodiment includes a pressure sensor that is provided in the cylinder tube of the test hydraulic cylinder 2.

The method for testing the stroke end buffering performance of the hydraulic cylinder based on the testing device comprises the following steps:

mounting a cylinder barrel of the test hydraulic cylinder 2 on the rack 8 and connecting a piston rod of the test hydraulic cylinder 2 with the crank arm 3;

the crank arm 3 is controlled to rotate so as to drive a piston rod of the test hydraulic cylinder 2 to reciprocate within a set stroke; and

and monitoring the parameter change of the test hydraulic cylinder 2 in the set stroke.

The test method of the embodiment further comprises moving the first mounting base 1 according to the test hydraulic cylinders 2 of different sizes and mounting the cylinder barrels of the test hydraulic cylinders 2 on the first mounting base 1.

The test method of the embodiment further comprises the step of adjusting the size of the working load borne by the test hydraulic cylinder 2 in the reciprocating motion process of the test hydraulic cylinder 2 in the set stroke.

The test method of the embodiment further comprises the step of adjusting the output force of the load hydraulic cylinder 6 to adjust the size of the working load borne by the test hydraulic cylinder 2.

Specifically, after the cylinder bottom of the test hydraulic cylinder 2 is connected with the first mounting seat 1 and the piston rod of the test hydraulic cylinder 2 extends out for a certain length, the earring is mounted on the crank arm 3. Be provided with a plurality of articulated seats on the crank arm 3, the position of first mount pad 1 on rack 8 also can remove about simultaneously to compatible different length, the experimental pneumatic cylinder 2 of different installation round pin axle diameters. The angle sensor 4 is used to detect the swing angle of the crank arm 3. By adjusting the output force of the load hydraulic cylinder 6, controllable working load is provided for the test hydraulic cylinder 2, the actual working load of the test hydraulic cylinder 2 is simulated, and the test accuracy is improved. The position of the second mounting seat 7 on the rack 8 can also be moved left and right, so that the requirements of different loads are met.

During testing, according to the actual working condition of the test hydraulic cylinder 2, the output force of the load hydraulic cylinder 6 is adjusted to adjust the input pressure of the test hydraulic cylinder 2, so that the test hydraulic cylinder 2 moves back and forth at the end of the stroke, namely the stroke is close to the buffer device to the end of buffering, and the running speed of the test hydraulic cylinder 2, the pressure change of the buffer area and other parameters are measured, so that the buffer performance and the service life of the tested cylinder are obtained, and data support is provided for product design and improvement.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.