1. The utility model provides a tumble test fixture, its characterized in that, includes the simulation cylinder liner of tube-shape, the inboard of simulation cylinder liner is provided with tumble test component and is located tumble reinforcing component of tumble test component's below, tumble reinforcing component includes the reinforcing plate, the face of reinforcing plate is followed the radial extension of simulation cylinder liner arranges, the neighboring of reinforcing plate with there is the clearance between the inner wall of simulation cylinder liner, the reinforcing plate is followed the axial slip of simulation cylinder liner arranges in tumble test component's below.

2. The tumble flow test tool according to claim 1, wherein the reinforcing plate is a circular plate, and the simulation cylinder liner is cylindrical.

3. The tumble flow test tool according to claim 2, wherein the reinforcing plate is arranged coaxially with the dummy cylinder liner.

4. The tumble flow test tool according to claim 2, wherein the diameter of the reinforcing plate is 0.3-0.9 times the inner diameter of the simulated cylinder sleeve.

5. The tumble flow test tool according to claim 2, wherein the distance between the reinforcing plate and the top end of the simulation cylinder sleeve is 0.8-1.2 times the inner diameter of the simulation cylinder sleeve.

6. The tumble flow test tool according to claim 1, wherein the tumble flow enhancing component further comprises a support rod connected to a lower portion of the enhancing plate.

7. The tumble flow testing tool according to claim 6, wherein the supporting rod is a telescopic rod.

8. The tumble flow test tool according to any one of claims 1 to 7, further comprising a test bench, wherein the test bench is provided with a mounting port, an upper end opening of the simulation cylinder sleeve is butted with the mounting port, the simulation cylinder sleeve is connected to the test bench in an angle-adjustable manner around the axis direction of the simulation cylinder sleeve, and/or the tumble flow test component is connected to the simulation cylinder sleeve in an angle-adjustable manner around the axis direction of the simulation cylinder sleeve.

9. The tumble flow test tool according to claim 8, wherein the simulated cylinder sleeve is rotatably connected to the test bench around the axis direction of the simulated cylinder sleeve, and/or the tumble flow test component is rotatably connected to the simulated cylinder sleeve around the axis direction of the simulated cylinder sleeve.

10. The tumble flow test tool according to claim 8, wherein the tumble flow test member is an annular blade.

11. A tumble flow testing apparatus comprising a tumble flow testing tool according to any one of claims 1 to 10.

Background

The organization of the air flow in the cylinder of the internal combustion engine has decisive influence on the formation of the mixed air and the combustion process in the cylinder, meanwhile, the quality of the combustion in the cylinder deeply influences the indexes of the engine such as dynamic property, economical efficiency and emission, and the good air flow organization plays an important role in improving the combustion rate and improving the mixing of the air in the cylinder and the unburned fuel. In the combustion process of gas engine and gasoline engine, the tumble flow with certain intensity is introduced to raise the propagation rate of flame in the cylinder and inhibit the combustion circulation change. The tumble flow has less momentum attenuation in the compression process, can be reserved to the end stage of a compression stroke, and along with the progress of the compression stroke, the large-scale tumble flow is broken into a plurality of small-scale turbulence flows, so that the turbulence intensity and the turbulence kinetic energy are increased, the in-cylinder combustion is favorably improved, and the engine performance is improved.

As shown in fig. 1, the conventional tumble testing apparatus generally includes an airflow channel test bed 010 (for carrying a cylinder head 01 or a core box to be tested and butting against an air passage), a pressure stabilizing cylinder 03, a flow meter 07, a pressure stabilizing box 08, a fan 09, a pressure sensor 06, a collector 05, a computer 04, and the like, a honeycomb body testing apparatus 02 in the airflow channel test bed 010 is used for detecting a tumble ratio generated by an air inlet channel of the cylinder head 01 to be tested, and a tumble schematic 011 is shown in fig. 2.

At present, the tumble testing method and device mainly aim at tumble air passages similar to passenger vehicles, tumble strength can be easily detected by the tumble testing device in the testing process, and tumble strength of a gas engine designed and developed on the basis of a diesel engine cannot reach the level of the passenger vehicles, so that the tumble can not be accurately captured and effective testing can not be realized by the existing tumble testing technical scheme.

Therefore, how to more accurately perform the tumble test on the cylinder head air passage with lower tumble strength is a technical problem that needs to be solved by those skilled in the art at present.

Disclosure of Invention

In view of this, the present invention provides a tumble testing tool and a tumble testing apparatus, and the tumble testing tool can perform a tumble test on an air passage of a cylinder head with low tumble strength, so as to improve testing accuracy.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a tumble test fixture, includes the simulation cylinder liner of tube-shape, the inboard of simulation cylinder liner is provided with tumble test component and is located tumble enhancement part of the below of test component, tumble enhancement part includes the reinforcing plate, the face of reinforcing plate is followed the radial extension of simulation cylinder liner arranges, the neighboring of reinforcing plate with there is the clearance between the inner wall of simulation cylinder liner, the reinforcing plate is followed the axial slip of simulation cylinder liner arranges in tumble test component's below.

Preferably, the reinforcing plate is a circular plate and the dummy cylinder liner is cylindrical.

Preferably, the reinforcing plate is arranged coaxially with the dummy cylinder liner.

Preferably, the diameter of the reinforcing plate is 0.3-0.9 times of the inner diameter of the simulated cylinder sleeve.

Preferably, the distance between the reinforcing plate and the top end of the simulated cylinder sleeve is 0.8-1.2 times of the inner diameter of the simulated cylinder sleeve.

Preferably, the tumble flow increasing means further includes a support bar connected to a lower side of the increasing plate.

Preferably, the support rod is a telescopic rod.

Preferably, the tumble testing tool further comprises a test bench, the test bench is provided with a mounting port, an opening in the upper end of the simulation cylinder sleeve is in butt joint with the mounting port, the simulation cylinder sleeve is connected to the test bench in an angle-adjustable manner around the axis direction of the simulation cylinder sleeve, and/or the tumble testing component is connected to the simulation cylinder sleeve in an angle-adjustable manner around the axis direction of the simulation cylinder sleeve.

Preferably, the simulation cylinder sleeve is connected to the test bench in a rotating mode around the axis direction of the simulation cylinder sleeve, and/or the tumble flow test component is connected to the simulation cylinder sleeve in a rotating mode around the axis direction of the simulation cylinder sleeve.

Preferably, the tumble flow test part is an annular vane.

The invention provides a tumble testing tool which is used for tumble testing equipment, and particularly comprises a cylindrical simulation cylinder sleeve, wherein a tumble testing component and a tumble reinforcing component positioned below the tumble testing component are arranged on the inner side of the simulation cylinder sleeve, the tumble reinforcing component comprises a reinforcing plate, the plate surface of the reinforcing plate extends along the radial direction of the simulation cylinder sleeve, a gap is formed between the peripheral edge of the reinforcing plate and the inner wall of the simulation cylinder sleeve, and the reinforcing plate is arranged below the tumble testing component in a sliding manner along the axial direction of the simulation cylinder sleeve.

The operating principle of the tumble testing tool provided by the invention is as follows:

when the tumble strength test is carried out on the cylinder cover to be tested or the air passage core box, the cylinder cover to be tested is installed on the test board, the air inlet channel is in butt joint with the upper end opening of the simulation cylinder sleeve, at the moment, the reinforcing plate is located below the tumble testing component and farthest away from the tumble testing component, the air suction device is started to start tumble testing, and the tumble strength in the simulation cylinder sleeve is measured by using the tumble testing component. If the tumble strength in the simulated cylinder liner is large enough, the tumble testing component can accurately measure and directly output the test result. If the tumble strength in the simulated cylinder sleeve is smaller than the test accuracy limit value of the tumble test component, the reinforcing plate is lifted upwards and is close to the tumble test component, at the moment, the distance between the reinforcing plate and the tumble test component is shortened, and the airflow can only continuously flow downwards from the gap between the reinforcing plate and the inner wall of the simulated cylinder sleeve after flowing through the tumble test component, so that part of the airflow is compressed after the reinforcing plate is lifted upwards, the tumble motion of the airflow when flowing through the tumble test component is enhanced, and the tumble test of the cylinder cover to be tested can be realized after the reinforcing plate is lifted to a certain height and the tumble test result can be stably output by the tumble test component.

According to the technical scheme, the tumble testing of the cylinder cover air passage with low tumble strength can be realized by additionally arranging the tumble enhancement component in the simulation cylinder sleeve, and the testing accuracy is improved.

The invention also provides a tumble testing device which comprises the tumble testing tool. The derivation process of the beneficial effects of the tumble testing equipment is substantially similar to the derivation process of the beneficial effects brought by the tumble testing tool, and therefore, the details are not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a conventional tumble testing apparatus;

FIG. 2 is a schematic diagram of tumble motion generated by a cylinder head to be tested in a test process;

FIG. 3 is a schematic diagram of the structural arrangement of a tumble flow test apparatus in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a tumble flow testing tool in an embodiment of the present invention.

The meaning of the various reference numerals in figures 1 to 2 is as follows:

01-a cylinder cover to be tested, 02-a honeycomb body testing device, 03-a pressure stabilizing cylinder, 04-a computer, 05-a collecting instrument, 06-a pressure sensor, 07-a flow meter, 08-a pressure stabilizing box, 09-a fan, 010-an airflow channel test bed and 011-tumble indication;

the meaning of the various reference numerals in fig. 3 to 4 is as follows:

the test method comprises the following steps of 1-test bench, 2-tumble testing part, 3-simulation cylinder sleeve, 4-pressure stabilizing cylinder, 5-computer, 6-acquisition instrument, 7-fan, 8-frequency converter, 9-air suction pipeline, 10-pressure stabilizing box, 11-flowmeter, 12-pressure sensor, 13-tumble enhancement part, 14-cylinder cover to be tested, 15-enhancement plate and 16-support rod.

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. 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.

Referring to fig. 2 to 4, fig. 2 is a schematic diagram illustrating a tumble motion generated by a cylinder head to be tested during a testing process; FIG. 3 is a schematic diagram of the structural arrangement of a tumble flow test apparatus in an embodiment of the present invention; fig. 4 is a schematic structural diagram of a tumble flow testing tool in an embodiment of the present invention.

The invention provides a tumble testing tool which comprises a cylindrical simulation cylinder sleeve 3, wherein a tumble testing component 2 and a tumble reinforcing component 13 positioned below the tumble testing component 2 are arranged on the inner side of the simulation cylinder sleeve 3, the tumble reinforcing component 13 comprises a reinforcing plate 15, the surface of the reinforcing plate 15 extends along the radial direction of the simulation cylinder sleeve 3, a gap exists between the peripheral edge of the reinforcing plate 15 and the inner wall of the simulation cylinder sleeve 3, and the reinforcing plate 15 is arranged below the tumble testing component 2 in a sliding manner along the axial direction of the simulation cylinder sleeve 3.

The operating principle of the tumble testing tool provided by the invention is as follows:

when the tumble strength test is carried out on the cylinder cover 14 to be tested or the air passage core box, the cylinder cover 14 to be tested is installed on the test bench 1, the air inlet channel is in butt joint with the upper end opening of the simulation cylinder sleeve 3, at the moment, the reinforcing plate 15 is located below the tumble testing component 2 and farthest away from the tumble testing component, the air suction device is started to start the tumble test, and the tumble strength in the simulation cylinder sleeve 3 is measured by using the tumble testing component 2. If the tumble strength in the simulated cylinder liner 3 is large enough, the tumble testing component 2 can accurately measure and directly output the test result. If the tumble strength in the simulated cylinder sleeve 3 is smaller than the test accuracy limit value of the tumble test component 2, the reinforcing plate 15 is lifted upwards and approaches the tumble test component 2, at this time, because the distance between the reinforcing plate 15 and the tumble test component 2 is shortened, and the airflow can only continuously flow downwards from the gap between the reinforcing plate 15 and the inner wall of the simulated cylinder sleeve 3 after flowing through the tumble test component 2, the reinforcing plate 15 compresses part of the airflow after being lifted upwards, so that the tumble motion of the airflow when flowing through the tumble test component 2 is enhanced, and therefore, when the reinforcing plate 15 is lifted to a certain height, and the tumble test component 2 can stably output a test result, the tumble test on the cylinder head 14 to be tested can be realized.

According to the technical scheme, the tumble flow test on the cylinder cover air passage with low tumble strength can be realized by additionally arranging the tumble flow enhancing component 13 in the simulation cylinder sleeve 3, and the test accuracy is improved.

It should be noted that the reinforcing plate 15 in the present embodiment is mainly used for compressing the air flow space, and the compression process is similar to the process of compressing the combustion chamber by the piston of the actual engine, specifically, the reinforcing plate 15 may be designed into various structural shapes, such as a circular plate, an elliptical plate, or a polygonal plate, etc., and the cylinder liner 3 is used for simulating the cylinder of the actual engine, and specifically, may also be designed into various cylindrical structures, such as a cylindrical structure with a circular, elliptical, or polygonal cross section, etc. Preferably, the reinforcing plate 15 in this embodiment is a circular plate, and the dummy cylinder liner 3 is a cylindrical structure.

Preferably, the reinforcement plate 15 is arranged coaxially with the dummy cylinder 3. With the arrangement, an annular gap with the consistent circumferential width is formed between the reinforcing plate 15 and the inner wall of the simulation cylinder sleeve 3, airflow flows downwards along the annular gap after flowing through the tumble testing component 2, and the airflow can be compressed and can be guaranteed to flow smoothly.

Preferably, the diameter D1 of the reinforcing plate 15 is 0.3 to 0.9 times the inner diameter D2 of the dummy cylinder liner 3, i.e., D1 is (0.3 to 0.9) D2. Further preferably, the distance H between the reinforcing plate 15 and the top end of the dummy cylinder 3 is 0.8 to 1.2 times the inner diameter D2 of the dummy cylinder 3, that is, H is (0.8 to 1.2) D2. Wherein the inner diameter D2 of the dummy cylinder 3 is equal to the inner diameter of the engine cylinder. By the design, the airflow can be ensured to flow smoothly while the airflow is compressed.

Preferably, the tumble flow increasing member 13 further includes a support bar 16 connected to the lower side of the increasing plate 15. The tumble flow enhancement component 13 in this scheme can wholly carry out the oscilaltion motion relative to tumble test component 2, and this scheme also can be fixed bracing piece 16, makes reinforcing plate 15 slide from top to bottom relative to bracing piece 16, and promptly, reinforcing plate 15 can realize through multiple form along the axial sliding arrangement of simulation cylinder liner 3. In a preferred scheme, the bracing piece 16 is designed to be telescopic rod structure, specifically can adopt hydraulic telescopic rod or pneumatic telescopic rod etc., only need flexible bracing piece 16 when the reinforcing plate 15 that needs to go up and down.

Preferably, the tumble testing tool further comprises a testing table 1, the testing table 1 is provided with a mounting port, an opening in the upper end of the simulation cylinder sleeve 3 is in butt joint with the mounting port, the simulation cylinder sleeve 3 is connected to the testing table 1 in an angle-adjustable manner around the axis direction of the simulation cylinder sleeve 3, and/or the tumble testing component 2 is connected to the simulation cylinder sleeve 3 in an angle-adjustable manner around the axis direction of the simulation cylinder sleeve 3.

Before testing, the included angle between the inlet valve connecting line direction of the cylinder cover 14 to be tested and the crankshaft axis direction is determined, then the cylinder cover 14 to be tested is installed and fixed above the test bench 1, and the crankshaft axis direction is consistent with the positioning direction of the test bench 1. And adjusting the installation angle of the simulated cylinder sleeve 3 relative to the test bench 1 or adjusting the installation angle of the tumble flow testing component 2 relative to the simulated cylinder sleeve 3, so that the position and angle of the tumble flow testing component 2 after being adjusted can be suitable for measuring tumble flow generated by the cylinder cover 14 to be measured. And finally, starting the tumble testing equipment to perform blowing test. Because the installation angle between the simulation cylinder sleeve 3 and the test bench 1 and/or the installation angle between the tumble testing component 2 and the simulation cylinder sleeve 3 are/is adjustable, the installation angle and the position of the tumble testing component 2 can be adjusted according to the arrangement inclination angle of the air inlet when the tumble test is performed on the to-be-tested cylinder cover 14 with the inclined air passage, so that the tumble test can be performed under the condition that the direction of the to-be-tested cylinder cover 14 is consistent with that of the test bench 1.

It should be noted that the simulated cylinder sleeve 3 in the invention can be mounted at an adjustable angle with the test bench 1 in various ways, and the tumble test component 2 can also be mounted at an adjustable angle with the simulated cylinder sleeve 3 in various ways, for example, the simulated cylinder sleeve 3 is rotatably connected to a mounting port of the test bench 1, and the simulated cylinder sleeve 3 can be rotated when the angle and position of the tumble test component 2 need to be adjusted, so that the simulated cylinder sleeve 3 and the tumble test component 2 rotate at a certain angle relative to the test bench 1; or, can also design the junction of simulation cylinder liner 3 and installing port as detachable construction to design the installing port inner circle into polygon location structure, when the installation angle that needs to change simulation cylinder liner 3, can turn certain angle after dismantling simulation cylinder liner 3, install again in the polygon installing port, thereby realize installation angle's regulation. The tumble testing component 2 can be rotatably connected to the inner side of the simulation cylinder sleeve 3, or a plurality of positioning holes can be formed in the circumferential side wall of the simulation cylinder sleeve 3, so that the purpose of adjusting the installation angle of the tumble testing component 2 relative to the simulation cylinder sleeve 3 can be realized when the end part of the tumble testing component 2 is installed in different positioning holes.

In a preferred scheme, the function of adjusting the installation angle is realized in a rotating connection mode, specifically, the simulation cylinder sleeve 3 is rotatably connected to the test board 1 around the axis direction of the simulation cylinder sleeve 3, and/or the tumble flow test component 2 is rotatably connected to the simulation cylinder sleeve 3 around the axis direction of the simulation cylinder sleeve 3.

It should be noted that the tumble flow test unit 2 in the present invention is used for detecting the strength of the tumble motion, and various tumble flow test elements can be specifically adopted, and preferably, the tumble flow test unit 2 in the present embodiment is an annular blade, as shown in fig. 4.

Further preferably, the outer periphery of the simulation cylinder liner 3 is provided with an annular fitting portion for rotationally fitting with the mounting port, and/or the side wall of the simulation cylinder liner 3 is provided with a sliding groove for the tumble testing member 2 to rotate. Wherein, the spout can be seted up at the inner wall of simulation cylinder liner 3, and the length of spout can be set up according to the angle control scope of tumble test component 2, for example, when the angle control scope of tumble test component 2 is 180, the length of spout can be half or whole of simulation cylinder liner 3 inner wall circumference, and the tip and the spout sliding fit of tumble test component 2 only need rotate tumble test component 2 when needing to adjust can.

Preferably, the test bench 1 is provided with a first locking mechanism for locking the mounting angle of the dummy cylinder 3 and/or the dummy cylinder 3 is provided with a second locking mechanism for locking the mounting angle of the tumble test part 2. Through setting up first locking mechanical system and/or second locking mechanical system, can lock its position after adjusting the installation angle of simulation cylinder liner 3 and/or tumble test part 2 to avoid its angle to change at the in-process of carrying out the test of blowing, guarantee to blow the test and go on smoothly.

Specifically, the first locking mechanism and/or the second locking mechanism may have various implementation forms, for example, a plurality of positioning holes are circumferentially arranged at the mounting port of the test board 1, a flange is arranged at the periphery of the simulation cylinder sleeve 3 and is provided with a positioning hole, and when the simulation cylinder sleeve 3 is adjusted to a target mounting angle, the positioning holes of the simulation cylinder sleeve 3 and the flange are penetrated by a positioning pin, so that the mounting angle of the simulation cylinder sleeve 3 can be locked; a plurality of positioning grooves can be formed in the inner wall of the simulation cylinder sleeve 3, when the tumble testing component 2 is adjusted to a target installation angle, the locking function can be achieved by the aid of limiting clamping effect of the end portion of the tumble testing component 2 and the positioning grooves, and the like.

Preferably, the test bench 1 and the simulation cylinder sleeve 3 are provided with a first positioning scale for indicating the installation angle of the simulation cylinder sleeve 3, and/or the simulation cylinder sleeve 3 and the tumble flow testing component 2 are provided with a second positioning scale for indicating the installation angle of the tumble flow testing component 2. First positioning scale sets up in testboard 1's installing port periphery, includes along a plurality of scale marks of installing port circumference evenly distributed. Because the crankshaft axis direction of the cylinder head 14 to be tested is consistent with the positioning direction of the test bench 1, in order to enable the tumble testing component 2 to be suitable for testing tumble motion generated by the cylinder head 14 to be tested, the included angle between the tumble testing component 2 and the positioning direction of the test bench needs to be adjusted to be equal to the included angle between the inlet valve connecting line direction of the cylinder head 14 to be tested and the crankshaft axis direction.

Preferably, the tumble flow testing tool further comprises a pressing device for pressing and fixing the cylinder head 14 to be tested on the test bench 1. Specifically, the pressing device may have a plurality of implementation forms, for example, a bolt fastening manner, or a cam pressing structure, or a clamping mechanism, etc., which are not described in detail herein.

It should be noted that the simulation cylinder sleeve 3 in the present invention can be rotatably connected to the test bench 1, and can also be detachably connected to the test bench 1, preferably, the simulation cylinder sleeve 3 in the present embodiment is detachably connected to the test bench 1, so that when the cylinder heads corresponding to different cylinder diameters need to be tested, the simulation cylinder sleeves 3 of different specifications can be replaced to meet the testing requirements.

In a preferred scheme, the test bench 1 is provided with a plurality of mounting ports, and a simulation cylinder sleeve 3 is arranged below each mounting port. By the arrangement, the testing requirement of the multi-cylinder cover can be met.

Because the number of cylinders and each cylinder interval that the cylinder heads of different specifications correspond have the difference, consequently, in order to make this tumble test fixture can be applicable to the cylinder head that detects various interval specifications, this scheme designs tumble test fixture for installing a mouthful interval adjustable structural style, and then realizes the interval adjustable function of simulation cylinder liner 3.

Specifically, the test bench 1 in this scheme includes a plurality of segmentation platforms, is provided with a installing port on every segmentation platform, and links to each other through interval adjustment mechanism between the adjacent segmentation platform. The distance adjusting mechanism can be implemented in various forms, for example, a gear and rack adjusting mechanism, or a screw and nut adjusting mechanism, or an air cylinder telescopic rod adjusting mechanism, and the like. Preferably, interval adjustment mechanism in this scheme includes adjusting screw and lock nut, can all be connected through adjusting screw series between each segmentation platform, and every segmentation platform all sliding connection is in adjusting screw, can adjust the interval of adjacent segmentation platform when loosening lock nut, adjusts to after the target interval, can fix the position of segmentation platform along adjusting screw through screwing up lock nut to interval regulatory function has been realized.

The invention also provides a tumble testing device which comprises the tumble testing tool. The derivation process of the beneficial effects of the tumble testing equipment is substantially similar to the derivation process of the beneficial effects brought by the tumble testing tool, and therefore, the details are not repeated herein.

It should be noted that the tumble testing apparatus provided in this embodiment further includes a pressure stabilizing cylinder 4, a computer 5, a collecting instrument 6, a fan 7, a frequency converter 8, an air suction pipeline 9, a pressure stabilizing box 10, a flow meter 11, a pressure sensor 12, and other components, as shown in fig. 3. When the tumble testing equipment is used for blowing test, a cylinder cover 14 to be tested or an air passage core box is arranged on a test board 1, a simulation cylinder sleeve 3 is arranged below the test board 1, a tumble testing part 2 is arranged inside the simulation cylinder sleeve 3 and used for measuring a tumble ratio, the tumble testing part 2 and the simulation cylinder sleeve 3 can rotate around the axis of the simulation cylinder sleeve 3, and the blowing test can be performed after the angle is fixed. The rotating speed of the fan 7 is controlled by the frequency converter 8, the flow meter 11 is used for detecting the flow in the simulation cylinder sleeve 3 and the pipeline, and the pressure stabilizing box 10 is arranged on the air suction pipeline 9 between the flow meter 11 and the fan 7 to play a role in stabilizing air flow. The pressure sensor 12 is used to detect the pressure inside the dummy cylinder 3. The pressure stabilizing cylinder 4 is connected below the simulation cylinder sleeve 3 and also plays a role in stabilizing pressure. The frequency converter 8, the two flow meters 11, the tumble testing component 2 and the pressure sensor 12 are connected with the acquisition instrument 6, and the acquisition instrument 6 is responsible for inputting and outputting signals. The acquisition instrument 6 is connected with the computer 5, and the computer 5 is used for monitoring the gas flow and the pressure value of the equipment and controlling the flow of the air suction pipeline 9 in a mode of controlling the frequency of the frequency converter 8.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.