CN210037168U - Experimental device for simulating collision between impeller blade and particles - Google Patents
Experimental device for simulating collision between impeller blade and particles Download PDFInfo
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- CN210037168U CN210037168U CN201920561597.5U CN201920561597U CN210037168U CN 210037168 U CN210037168 U CN 210037168U CN 201920561597 U CN201920561597 U CN 201920561597U CN 210037168 U CN210037168 U CN 210037168U
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Abstract
The utility model relates to a mechanical experiment device. The technical scheme is as follows: an experimental device for simulating the collision of impeller blades and particles comprises a bottom plate; the method is characterized in that: a particle bearing and releasing device for emitting particles is positioned on the bottom plate through a lifting mechanism, a sample plate rotating device for impacting the emitted particles is arranged below the particle bearing and releasing device, and a high-speed camera system for shooting the impact condition of the particles is additionally arranged; the particle bearing and releasing device comprises a pneumatic sliding table, a cylinder and an air source, wherein the pneumatic sliding table can be horizontally positioned on the lifting mechanism in a sliding manner and driven by an air cylinder, the cylinder is fixed on the pneumatic sliding table and used for carrying particles, and the air source is used for providing power for the air pump; the sample plate rotating device comprises a worm gear transmission mechanism driven by a servo motor and a sample plate driven by the worm gear transmission mechanism to swing. The experimental device can quantitatively simulate the collision, sliding and rebounding process of single particles and impeller blades.
Description
Technical Field
The utility model relates to a mechanical experiment device, concretely relates to experimental apparatus of simulation impeller blade and granule collision.
Background
The research on the collision between the impeller and particles has important significance for reducing abrasion and prolonging the service life of impeller parts of fluid machinery. The collision rebound test bed mentioned in the prior document mostly has the collision between moving particles and a static sample, and although the recovery coefficient of the material can be measured, the collision state in an impeller flow channel cannot be truly reflected. When the rotating impeller collides with the particles, rather than a simple relative motion, coriolis forces are added and the collision is more complex than with a stationary specimen. However, the real collision situation in the impeller flow channel is difficult to directly observe and measure.
In order to further study the phenomenon of collision rebound in the impeller flow channel, a new test scheme is needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of above-mentioned background art, provide an experimental apparatus of simulation impeller blade and granule collision, this experimental apparatus should be able to the rebound process of the collision of quantitative simulation single granule and impeller blade sliding.
In order to achieve the above purpose, the utility model provides the following technical scheme:
an experimental device for simulating the collision of impeller blades and particles comprises a bottom plate; the method is characterized in that: a particle bearing and releasing device for emitting particles is positioned on the bottom plate through a lifting mechanism, a sample plate rotating device for impacting the emitted particles is arranged below the particle bearing and releasing device, and a high-speed camera system for shooting the impact condition of the particles is additionally arranged;
the particle bearing and releasing device comprises a pneumatic sliding table, a cylinder and an air source, wherein the pneumatic sliding table can be horizontally positioned on the lifting mechanism in a sliding manner and driven by an air cylinder, the cylinder is fixed on the pneumatic sliding table and used for carrying particles, and the air source is used for providing power for the air pump;
the sample plate rotating device comprises a worm gear transmission mechanism driven by a servo motor and a sample plate driven by the worm gear transmission mechanism to swing.
The lifting mechanism comprises a supporting seat vertically fixed on the bottom plate, a screw rod positioned on the supporting seat and capable of rotating around a vertical axis, a nut slider matched with the screw rod and capable of vertically sliding along the surface of the supporting seat, and a stepping motor driving the screw rod.
The pneumatic sliding table comprises a guide rail horizontally arranged on the lifting seat, an air cylinder arranged on the lifting seat and a pneumatic sliding block which can be slidably positioned on the guide rail, and the cylinder is fixed on the pneumatic sliding block.
The air source is communicated with the air cylinder through an air pipe, and the air pipe is provided with an electromagnetic valve for control.
The sample plate is fixed on an output shaft of the worm gear transmission mechanism through a T-shaped rod.
The output shaft is arranged horizontally.
The high-speed camera system comprises a light source, a high-speed camera and a reflector group which surrounds the periphery of the sample plate and forms a certain angle with the horizontal plane.
The axis of the high-speed camera lens is perpendicular to the axis of the light source.
The utility model has the advantages that: the utility model selects the servo motor as power, which can conveniently control the rotating speed and the rotating positioning; the output shaft of the motor drives a worm gear transmission mechanism (the worm gear transmission has self-locking property, can resist the impact force of particles on the sample plate, and avoids the reverse stroke of the sample plate from influencing the experimental result); the sample plate is fixed on the worm wheel spindle through the T-shaped rod (the sample plate is fixed on the T-shaped rod through the bolt), and the sample can be conveniently replaced by adopting bolt connection, so that the test requirement of various materials is met. The worm gear and the worm are combined with the servo motor, so that the device can be conveniently positioned at any angle and used as a conventional static sample plate collision rebound experiment device.
Drawings
Fig. 1 is a schematic view of the general structure of the present invention (the components of the air source and the air path are omitted in the figure).
Fig. 2 is a schematic perspective view of the connection structure of the particle releasing and bearing device and the air source of the present invention.
Fig. 3 is a schematic perspective view of the middle circular tube of the present invention.
Fig. 4 is a schematic perspective view of the pneumatic slider with round tubes.
FIG. 5 is a schematic view of the pneumatic slide without the round tube installed.
Fig. 6 is a schematic perspective view of the lifting mechanism of the present invention.
Fig. 7 is a schematic perspective view of a reflector assembly according to the present invention.
Fig. 8 is a schematic perspective view of the T-bar with sample plates according to the present invention.
Fig. 9 is a schematic view of another aspect of the present invention.
Detailed Description
The following describes the embodiments of the present invention with reference to the drawings.
The experimental device for simulating the collision between the impeller blade and the particles shown in fig. 1 comprises an air source 25, a particle bearing and releasing device (an air cylinder 13, a pneumatic slider 14, a limiting block 15 and a guide rail 16), a lifting mechanism (a screw rod 9, a stepping motor 7, a lower support 8, a nut slider 10 and an upper support 28), a servo motor 1, a sample plate rotating device (a worm 4, a worm wheel 5, a main shaft 6, a sample plate 12 and a T-shaped rod 11), and a high-speed camera system (a light source 22, a high-speed camera 23 and a reflector group 17). Also includes a bearing, a bearing seat, a scale 18 and a bottom plate 19. The bottom plate is the basement of whole experimental apparatus, is equipped with the scale on the scale and is used for the auxiliary experiment.
This example differs from conventional free-fall release granules in that in order to obtain a sufficient initial velocity of the granules, the granules are released in a horizontal projectile form (steel granules are recommended). As shown in FIG. 3, the granules are placed in a circular tube 26 with an inner diameter slightly larger than the diameter of the granules, one end of the circular tube moving forward is open, and the other end is closed and provided with a convex edge 31 (preferably, the inner diameter of the circular tube is slightly larger than the granules, and the length of the circular tube is controlled to be about 3 times that of the granules). As shown in fig. 4 and 5, the circular tube is directly fixed in the groove on one side of the pneumatic sliding table 14 through a flange, so that the circular tubes with different inner diameters can be conveniently replaced, and the movement of the circular tubes can be restrained. As shown in fig. 2, a guide rail 16 is installed on one surface of a plate-shaped lifting seat 29, and a pneumatic sliding table 14 and a limiting block 15 are installed on the guide rail 16; the guide rail is provided with channels 30 on both sides, and the limiting block 15 is provided with threaded holes on both sides, and can be fixed at any position within the range of the guide rail channels through bolts and nuts, so that the particle release position can be conveniently adjusted. The pneumatic sliding table 14 is connected with a piston rod of the air cylinder 13, and the opening and closing of an air source (generally a compressed air storage tank) is controlled by an electromagnetic valve. The air cylinder pushes the pneumatic sliding table to move forwards quickly under the driving of high-pressure air until the pneumatic sliding table stops after impacting the limiting block 15, and particles in the circular tube are horizontally thrown out at the speed of collision under the action of inertia. The aim of controlling the particle ejection speed can be achieved by calibrating the corresponding relation between the pressure in the gas source and the particle speed.
Referring to fig. 1 and 9, the sample plate rotating device includes a servo motor 1, a motor support 2, a coupling 3, a worm 4, a worm wheel 5, a spindle 6, a T-shaped rod 11, and a sample plate 12. The servo motor 1 is arranged on a motor support 2 which is fixed on a bottom plate 19. An output shaft of the servo motor 1 is connected with a worm 4 through a coupler 3, the worm 4 is meshed with a worm wheel 5, and the worm wheel is installed on a main shaft 6. Referring to fig. 8, one end of the T-shaped rod 11 has an annular structure for mounting on the main shaft 6; the sample plate 12 is fixed to a T-bar. According to the results of experiments by Sondergaard et al, the coefficient of restitution of the particles increases with increasing wall thickness to particle size ratio (D/b), and does not stabilize until D/b > 4. To ensure the experimental results, the specimen thickness should be greater than 10 mm. The worm gear mechanism has the self-locking characteristic, can resist the impact effect of particles on the sample plate 12, and avoids the sample plate from reversing to influence the experimental result. Meanwhile, the worm gear mechanism and the servo motor 1 are combined for use, and can be positioned to any angle (the precision is related to the selection of the servo motor) within the range of 0-90 degrees. Therefore, the utility model relates to an experimental apparatus also can regard as the static collision rebound test bench of conventional sample board to use.
Referring to fig. 6, the lifting mechanism includes a stepping motor 7, a lead screw 9, a nut slider 10 engaged with the lead screw, a coupling 26 connecting the shaft of the stepping motor and the lead screw, and a lower support 8 and an upper support 28 supporting the lead screw and having bearings. The mounting seat of the stepping motor, the lower support and the upper support are all fixed on a support frame 20 through bolts, and the support frame is fixed on a bottom plate 19 through fixing bolts; one side of the nut sliding block is attached to the surface of the support frame, and when the screw rod rotates, the screw rod only vertically moves along the surface of the support frame without rotating; the nut sliding block is also fixed with a lifting seat. Elevating system is lead screw slider mechanism, by step motor drive the utility model relates to an among the experimental apparatus, play the effect of adjusting release position height.
As shown in fig. 1, the high-speed imaging system includes a high-speed camera 23, a light source 22 (typically an illumination lamp), and a mirror group 17. The axis of the lens of the camera 23 and the axis of the light source 24 are vertically distributed at two sides of the experimental device. In order to clearly capture the particle motion trajectory, a high-speed camera employs a low shutter time and a high frame rate. Since the above-mentioned imaging request is high in the amount of light entering the lens, the light source 22 faces the sample plate and a mirror reflection system is provided.
Further, the high speed camera and the light source are in a vertical arrangement; the mirror reflection system comprises a reflector set 17 (a plurality of reflectors in the reflector set are supported by reflector supports which are fixed on a bottom plate) which forms a certain angle with the horizontal plane and is arranged at the periphery of a sample plate, and a reflector of which one surface faces to the high-speed camera. The arrangement of the mirror surface can reduce the workload of adjusting the positions of the light source and the camera and improve the imaging quality.
In addition, the experimental device also needs to adopt a transparent material as a shell (preferably organic glass as the shell; clear in drawing and omitted in the drawing) so as to protect the safety of the testers and the high-speed camera.
Test methods examples:
the method for using the experimental device of the utility model comprises the following steps:
the first step is as follows: according to the experimental requirements, determining experimental parameters of angular velocity omega (rad/s), impact angle gamma (rad) and initial particle velocity v1(m/s), particle impact velocity v2(m/s), the distance d (m) of the point of impact to the axis of the spindle.
The second step is that: and (3) calculating the horizontal distance (the position of a limiting block) between a particle release point and the center of the main shaft, the vertical distance (the height of a sliding table) between the particle release point and the center of the main shaft in detail and the starting time t of the main shaft (positive values are ts after the particles are released and negative values are ts after the main shaft is started to release the particles) according to formulas (1.1) to (1.8).
The third step: adjusting air pressure of an air source, commissioning the pneumatic sliding table, and measuring the time t required by the sliding table from starting to collision stopping3. Starting the electromagnetic valve as zero time and the servo motor as t4The time of day. The calculation formula is referred to (1.9).
The fourth step: according to the calculation result of the second step, the movable limiting block 15 adjusts the horizontal distance between the particle release point and the center of the main shaft, and controls the stepping motor 7 to adjust the vertical distance (height of the sliding table) between the particle release point and the center of the main shaft and the starting time of the servo motor 1.
The fifth step: the high-speed camera 23 and the light source 22 are adjusted and turned on to observe the shot picture, and the reflector group 17 is adjusted until the shot area in front of the sample plate is in the center of the visual field. And selecting a round pipe according to the particle size, placing the particles in the round pipe, starting the experimental device, and waiting for the collision to finish.
And a sixth step: the particles were recovered and the sample plate removed for additional analysis to complete the test.
In addition, the parts not related in the embodiment are all solved by the prior art, and are not described herein. The utility model discloses the concrete implementation method is many with the improvement, above is only the preferred implementation method of the utility model. To the ordinary technical personnel in this technical field, can also make a plurality of improvements and decorations under the prerequisite of the utility model. Such modifications and finishes are also to be considered as the scope of protection of the present invention.
Claims (8)
1. An experimental device for simulating the collision of impeller blades and particles comprises a bottom plate (19); the method is characterized in that: a particle bearing and releasing device for emitting particles is positioned on the bottom plate through a lifting mechanism, a sample plate rotating device for impacting the emitted particles is arranged below the particle bearing and releasing device, and a high-speed camera system for shooting the impact condition of the particles is additionally arranged;
the particle bearing and releasing device comprises a pneumatic sliding table, a cylinder (26) and an air source, wherein the pneumatic sliding table can be horizontally and slidably positioned on the lifting mechanism and is driven by an air cylinder (13), the cylinder (26) is fixed on the pneumatic sliding table and is used for carrying particles, and the air source is used for providing power for the air pump;
the sample plate rotating device comprises a worm gear transmission mechanism driven by a servo motor and a sample plate (12) driven by the worm gear transmission mechanism to swing.
2. The experimental device for simulating the collision of the impeller blades with the particles as claimed in claim 1, wherein: the lifting mechanism comprises a supporting seat (20) vertically fixed on the bottom plate, a screw rod (9) positioned on the supporting seat and capable of rotating around a vertical axis, a nut slider (10) matched with the screw rod and capable of vertically sliding along the surface of the supporting seat, and a stepping motor (7) for driving the screw rod.
3. The experimental device for simulating the collision of the impeller blades with the particles as claimed in claim 2, wherein: the pneumatic sliding table comprises a guide rail (16) horizontally arranged on a lifting seat (29), an air cylinder arranged on the lifting seat and a pneumatic sliding block which can be slidably positioned on the guide rail, and the cylinder is fixed on the pneumatic sliding block.
4. The experimental device for simulating the collision of the impeller blades with the particles as claimed in claim 3, wherein: the high-speed camera system comprises a light source (22), a high-speed camera (23) and a reflector group (17) which surrounds the periphery of the sample plate and forms a certain angle with the horizontal plane.
5. The experimental device for simulating the collision of the impeller blades with the particles as claimed in claim 4, wherein: the air source is communicated with the air cylinder through an air pipe, and the air pipe is provided with an electromagnetic valve for control.
6. The experimental device for simulating the collision of the impeller blades with the particles as claimed in claim 5, wherein: the sample plate is fixed on an output shaft of the worm gear transmission mechanism through a T-shaped rod (11).
7. The experimental device for simulating the collision of the impeller blades with the particles as claimed in claim 6, wherein: the output shaft is arranged horizontally.
8. The experimental device for simulating the collision of the impeller blades with the particles as claimed in claim 7, wherein: the axis of the high-speed camera lens is perpendicular to the axis of the light source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920561597.5U CN210037168U (en) | 2019-04-23 | 2019-04-23 | Experimental device for simulating collision between impeller blade and particles |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920561597.5U CN210037168U (en) | 2019-04-23 | 2019-04-23 | Experimental device for simulating collision between impeller blade and particles |
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| CN201920561597.5U Withdrawn - After Issue CN210037168U (en) | 2019-04-23 | 2019-04-23 | Experimental device for simulating collision between impeller blade and particles |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174229A (en) * | 2019-04-23 | 2019-08-27 | 浙江理工大学 | A kind of experimental provision and test method of simulated impeller blade and particles collision |
| CN112014109A (en) * | 2020-07-30 | 2020-12-01 | 南京航空航天大学 | Simulation test device for loss of aero-engine rotor blade |
| CN112924304A (en) * | 2021-01-27 | 2021-06-08 | 清华大学 | Free falling body impact experiment device and method |
| CN113390735A (en) * | 2021-06-25 | 2021-09-14 | 东北农业大学 | Prediction method for grain breakage probability under single impact load |
| CN114563269A (en) * | 2022-02-28 | 2022-05-31 | 淄博市产品质量检验研究院 | Axial flow pump detection device and detection method thereof |
| CN116558763A (en) * | 2023-07-12 | 2023-08-08 | 新乡职业技术学院 | Anti-falling performance test equipment for computer parts |
-
2019
- 2019-04-23 CN CN201920561597.5U patent/CN210037168U/en not_active Withdrawn - After Issue
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174229A (en) * | 2019-04-23 | 2019-08-27 | 浙江理工大学 | A kind of experimental provision and test method of simulated impeller blade and particles collision |
| CN110174229B (en) * | 2019-04-23 | 2024-03-29 | 浙江理工大学 | Experimental device and experimental method for simulating collision of impeller blades and particles |
| CN112014109A (en) * | 2020-07-30 | 2020-12-01 | 南京航空航天大学 | Simulation test device for loss of aero-engine rotor blade |
| CN112924304A (en) * | 2021-01-27 | 2021-06-08 | 清华大学 | Free falling body impact experiment device and method |
| CN113390735A (en) * | 2021-06-25 | 2021-09-14 | 东北农业大学 | Prediction method for grain breakage probability under single impact load |
| CN114563269A (en) * | 2022-02-28 | 2022-05-31 | 淄博市产品质量检验研究院 | Axial flow pump detection device and detection method thereof |
| CN114563269B (en) * | 2022-02-28 | 2023-10-13 | 淄博市产品质量检验研究院 | Axial flow pump detection device and detection method thereof |
| CN116558763A (en) * | 2023-07-12 | 2023-08-08 | 新乡职业技术学院 | Anti-falling performance test equipment for computer parts |
| CN116558763B (en) * | 2023-07-12 | 2023-09-05 | 新乡职业技术学院 | Anti-falling performance test equipment for computer parts |
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