Air floating clamping tool and impeller dynamic balance testing equipment

Abstract

The application belongs to the technical field of impeller detection, and provides a gas floating clamping tool and an impeller dynamic balance testing device. The gas floating clamping tool comprises an outer fixing sleeve, the outer fixing sleeve is provided with a first air inlet hole, a second air inlet hole and a third air inlet hole, an inner mounting cylinder is fixedly mounted in the outer fixing sleeve, and an axle sleeve is mounted in the inner mounting cylinder through an end cover and a locking ring. An outer end surface groove is formed on the side of the end cover away from the axle sleeve, the first air inlet hole is communicated with the outer end surface groove through a first airflow channel, a middle cavity is formed between the axle sleeve and the middle part of the axle of the impeller in a testing state, the second air inlet hole is communicated with the middle cavity through a second airflow channel, a plurality of air blowing holes are formed in the inner walls of the top and bottom of the axle sleeve, and the third air inlet hole is communicated with the air blowing holes through a third airflow channel. The application can improve the dynamic balance testing precision of the impeller, avoid secondary damage to the impeller in the testing process, and greatly improve the testing efficiency of the impeller.

Description

Technical Field

[0001] This invention relates to the field of impeller testing technology, and in particular to an air-float clamping fixture and an impeller dynamic balancing testing device. Background Technology

[0002] As the core component of a turbocharger, the impeller is crucial for improving engine performance. During the impeller's manufacturing process, various factors, such as uneven material distribution, blank defects, errors in processing and assembly, and even asymmetrical geometry in the design, can cause uneven mass distribution and unbalanced centrifugal force when the impeller rotates at high speed. This force increases proportionally to the square of the rotational speed, acting on the machine and its foundation through the bearings, causing vibration, noise, accelerated bearing wear, shortened machine life, and in severe cases, destructive accidents.

[0003] Impeller dynamic balancing testing is a key process that uses specialized equipment to detect uneven mass distribution in a rotating impeller and corrects it to control the centrifugal force deviation within acceptable limits. This reduces vibration and noise, and improves equipment stability and lifespan. During the test, the amplitude and phase of the impeller's vibration are measured to calculate the magnitude and location of the imbalance. The imbalance is then offset by adding or removing weight. By performing dynamic balancing tests on the impeller, it is brought to the acceptable level of balance accuracy, or the resulting mechanical vibration amplitude is reduced to within acceptable limits.

[0004] Currently, dynamic balancing tests for impellers mainly include offline dynamic balancing tests and online dynamic balancing tests. Offline dynamic balancing tests involve disassembling the impeller from the equipment, installing it on a dedicated dynamic balancing testing device, setting the rotation speed, starting the test, collecting vibration data through sensors, calculating the imbalance, and then applying / removing weight for correction, followed by repeated testing until the standard is met. Offline dynamic balancing tests have the advantage of high accuracy and are suitable for factory testing of new impellers or correction after major overhauls. However, current offline dynamic balancing testing devices have gradually revealed the following shortcomings during use:

[0005] (1) There is a large contact friction between the impeller and the clamping fixture of the test device, which will not only affect the test accuracy of the impeller, but may also cause secondary damage to the impeller during the test.

[0006] (2) Most of them use a power source to drive the impeller to rotate by mechanical transmission. While driving the impeller to rotate, they will interfere with the impeller and affect the test accuracy of the impeller.

[0007] (3) The installation and disassembly of the impeller are inconvenient when testing it, making the installation and disassembly of the impeller on the dynamic balancing test device cumbersome, time-consuming and labor-intensive, which directly affects the testing efficiency of the impeller. Summary of the Invention

[0008] In order to overcome the shortcomings of the prior art as mentioned above, in-depth research was conducted, and after a great deal of creative work, the present invention was completed.

[0009] Specifically, the technical problem to be solved by the present invention is to provide an air-floating clamping fixture and impeller dynamic balancing test equipment to solve the technical problems of poor test accuracy, cumbersome and inconvenient test operation, time and labor consumption and low test efficiency of the current impeller test device.

[0010] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0011] An air-floating clamping fixture includes an outer fixing sleeve, an inner mounting cylinder fixedly installed inside the outer fixing sleeve, a wheel axle sleeve provided inside the inner mounting cylinder, an end cap fixedly installed at the top of the inner mounting cylinder, a locking pressure ring threadedly installed at the bottom of the inner mounting cylinder, the wheel axle sleeve being located between the end cap and the locking pressure ring, and both ends of the wheel axle sleeve abutting against the end cap and the locking pressure ring respectively;

[0012] The end cap has an outer end face groove on the side opposite to the wheel axle sleeve, and the outer fixing sleeve has a first air inlet hole. The outer fixing sleeve, the inner mounting cylinder and the end cap have a first airflow channel connecting the first air inlet hole and the outer end face groove.

[0013] The inner diameter of the top of the wheel bushing is adapted to the outer diameter of the top of the impeller shaft, and the inner diameter of the bottom of the wheel bushing is adapted to the outer diameter of the tail of the impeller shaft. When in the test state, a cavity is formed between the wheel bushing and the middle of the impeller shaft. Air passage gaps are formed between the top of the wheel bushing and the top of the impeller shaft, and between the bottom of the wheel bushing and the tail of the impeller shaft.

[0014] The outer fixing sleeve is provided with a second air inlet hole, and the outer fixing sleeve, the inner mounting cylinder and the wheel axle sleeve have a second airflow channel connecting the second air inlet hole and the middle cavity;

[0015] The top and bottom inner walls of the wheel axle sleeve are evenly provided with a number of air blowing holes along their circumference. The outer fixed sleeve is provided with a third air inlet hole. The outer fixed sleeve, the inner mounting cylinder and the wheel axle sleeve are provided with a third airflow channel connecting the third air inlet hole and the air blowing hole.

[0016] As an improved technical solution, the top end of the inner mounting cylinder extends to the outer fixing sleeve and has an integrally formed fixing part. The fixing part is provided with a crimping end plate on the side opposite to the outer fixing sleeve. The crimping end plate, the fixing part and the outer fixing sleeve are fixedly connected by bolts. The end cap is fixedly pressed between the crimping end plate and the inner mounting cylinder.

[0017] The locking ring includes an integrally formed threaded connection part and a screw adjustment part. The threaded connection part is threadedly installed on the bottom end of the inner mounting cylinder and abuts against the wheel axle sleeve. The screw adjustment part is located outside the inner mounting cylinder, and the outer peripheral wall of the screw adjustment part is provided with anti-slip knurling.

[0018] As an improved technical solution, the inner wall of the outer fixing sleeve is provided with a plurality of first sealing grooves, and a first sealing ring is installed in each of the first sealing grooves. The outer fixing sleeve is sealed to the inner mounting cylinder by means of the first sealing rings.

[0019] The inner wall of the inner mounting cylinder is provided with a plurality of second sealing grooves, and a second sealing ring is installed in each of the second sealing grooves. The inner mounting cylinder is sealed to the wheel axle sleeve by means of the second sealing rings.

[0020] The top end of the inner mounting cylinder is provided with a third sealing groove, and a third sealing ring is installed in the third sealing groove. The end cap is sealed to the inner mounting cylinder by means of the third sealing ring.

[0021] The top end of the wheel axle sleeve is provided with a fourth sealing groove, and a fourth sealing ring is installed in the fourth sealing groove. The end cover is sealed to the wheel axle sleeve by means of the fourth sealing ring.

[0022] As an improved technical solution, the outer wall of the inner mounting cylinder is provided with an annular first outer wall groove, and the inner mounting cylinder and the outer fixing sleeve are arranged to form a first air cavity through the first outer wall groove, and the first air inlet hole is connected to the first air cavity.

[0023] The end cap has an annular inner end face groove on the side near the inner mounting cylinder, and the end cap forms a second air cavity with the inner end face groove and the inner mounting cylinder.

[0024] The top of the inner mounting cylinder is provided with a plurality of first air passage holes evenly distributed along its circumference. The first air chamber is connected to the second air chamber through the first air passage holes. The end cap is provided with a plurality of second air passage holes evenly distributed along its circumference. The second air chamber is connected to the outer end face groove through the second air passage holes.

[0025] The first air chamber, the first air passage, the second air chamber, and the second air passage are sequentially connected to form the first airflow channel.

[0026] As an improved technical solution, the outer wall of the inner mounting cylinder is provided with an annular second outer wall groove, and the inner mounting cylinder and the outer fixing sleeve are arranged to form a third air cavity through the second outer wall groove, and the second air inlet hole is connected to the third air cavity;

[0027] The inner wall of the inner mounting cylinder is provided with an annular first inner wall groove, which is located in the middle of the inner mounting cylinder. The inner mounting cylinder forms a fourth air cavity by surrounding the wheel axle sleeve through the first inner wall groove.

[0028] The inner mounting cylinder has several third air passages evenly distributed around its circumference in the middle part. The third air chamber is connected to the fourth air chamber through the third air passages. The wheel axle sleeve has several fourth air passages evenly distributed around its circumference in the middle part. The fourth air chamber is connected to the middle cavity through the fourth air passages.

[0029] The third air chamber, the third air passage, the fourth air chamber, and the fourth air passage are sequentially connected to form the second airflow channel.

[0030] As an improved technical solution, the outer wall of the inner mounting cylinder is provided with an annular third outer wall groove, and the inner mounting cylinder and the outer fixing sleeve are surrounded by the third outer wall groove to form a fifth air chamber, and the third air inlet hole is connected to the fifth air chamber;

[0031] The inner wall of the inner mounting cylinder is provided with an annular second inner wall groove, which is located at the top and bottom of the inner mounting cylinder respectively. The inner mounting cylinder forms a sixth air chamber by surrounding the wheel axle sleeve through the second inner wall groove.

[0032] The bottom of the inner mounting cylinder is evenly provided with a plurality of fifth air passage holes along its circumference. The fifth air chamber is connected to the sixth air chamber through the fifth air passage holes. The middle part of the inner mounting cylinder is evenly provided with a plurality of sixth air passage holes along its circumference. The two sixth air chambers are connected through the sixth air passage holes. The two sixth air chambers are respectively connected to the air blowing hole.

[0033] The fifth air chamber, the fifth air passage, the sixth air chamber, and the sixth air passage form the third airflow channel.

[0034] As an improved technical solution, the end cover is provided with a plurality of vent holes evenly distributed along its circumference, and the fixing part is provided with a plurality of strip holes corresponding to the vent holes. When in the test state, the end cover, the wheel shaft sleeve and the top of the impeller shaft form an exhaust chamber, and the exhaust chamber is connected to the strip holes through the vent holes.

[0035] This invention also discloses an impeller dynamic balancing test device, including the aforementioned air-floating clamping fixture and a frame. The air-floating clamping fixture is vertically fixed to the frame via the outer fixing sleeve. A lifting hood for driving the impeller to rotate is provided above the air-floating clamping fixture. The lifting hood is connected to an air supply device and is slidably installed on the frame in the vertical direction and driven by a first driving device. A detection sensor for realizing impeller dynamic balancing detection is provided above the lifting hood.

[0036] The air-floating clamping fixture is provided with an impeller lifting device below it, and an impeller picking and placing device for picking up and placing the impeller is also provided on one side of the air-floating clamping fixture.

[0037] As an improved technical solution, a shroud mounting plate driven by the first driving device is slidably installed on the frame in the vertical direction. The lifting shroud is fixedly installed at the bottom of the shroud mounting plate, and the lifting shroud is an annular cylindrical structure. The inner wall of the lifting shroud is evenly provided with several inclined air outlet holes along its circumference. When in the test state, the impeller is inserted into the air-floating clamping fixture, and the lifting shroud is fitted outside the blade assembly of the impeller. The axial direction of the air outlet hole is consistent with the blade angle of the impeller.

[0038] A sensor mounting plate is fixedly installed on the top of the hood mounting plate, and the detection sensor is fixedly installed on the sensor mounting plate, with the detection sensor corresponding to the lifting hood.

[0039] As an improved technical solution, the impeller lifting device includes a lifting base fixedly installed on the frame, and a wheel shaft push rod driven by a second drive device is slidably installed on the lifting base in the vertical direction. When in the test state, the wheel shaft push rod is set to correspond with the wheel shaft of the impeller.

[0040] The impeller picking and placing device includes a lifting mounting plate that is slidably mounted on the frame in the vertical direction and driven by a third driving device. A translation mounting plate driven by a fourth driving device is slidably mounted on the lifting mounting plate in the horizontal direction. A gripper cylinder for clamping the impeller is fixedly mounted on the translation mounting plate. The gripper cylinder is located between the air-floating clamping fixture and the lifting hood, and a shaft clamp adapted to the impeller shaft is fixedly mounted on the gripper fingers of the gripper cylinder.

[0041] After adopting the above technical solution, the beneficial effects of the present invention are:

[0042] This air-float clamping fixture is compact and small in size. During dynamic balancing tests of the impeller, the impeller is inserted into the fixture from top to bottom via its shaft. High-pressure airflow is then introduced through the air inlets of the outer fixed sleeve. The introduced airflow is divided into three paths: the first path is delivered to the outer end face groove via the first airflow channel, acting on the impeller through the groove to exert an upward force, counteracting the impeller's weight and forming an air film between the impeller shaft and the end cover, significantly reducing the contact friction between them; the second path is delivered to the central cavity via the second airflow channel, flowing upwards and downwards along the axial direction of the shaft sleeve, and passing through the shaft sleeve... The air gap between the impeller shaft and the bushing forms an air film between the impeller shaft and bushing, greatly reducing the contact friction between the impeller shaft and bushing. The third airflow is delivered to the blowing hole through the third airflow channel, directly acting on the air gap between the bushing and the impeller shaft. Together with the second airflow, it forms an air film between the impeller shaft and bushing, further reducing the contact friction between the impeller shaft and bushing. The combined action of the three airflows cancels out the gravity of the impeller and reduces the contact friction between the impeller and the fixture. Then, the impeller is driven to rotate, allowing for dynamic balancing tests. After the test is completed, the impeller can be removed from the fixture from bottom to top.

[0043] This air-floating clamping fixture can counteract the impeller's weight and form an air film covering the impeller shaft during dynamic balancing tests. This significantly reduces the contact friction between the impeller and the clamping fixture, making it easier to drive the impeller to rotate at high speed during dynamic balancing tests. It also effectively avoids the influence of contact friction on the dynamic balancing test, resulting in higher accuracy of the dynamic balancing test and preventing secondary damage to the impeller during the test. In addition, the impeller can be installed and removed from the fixture by plugging and unplugging, making the disassembly and assembly operations simple and convenient, greatly improving the testing efficiency of the impeller.

[0044] This impeller dynamic balancing testing equipment is highly automated. During operation, the impeller to be tested is placed on the air-floating clamping fixture. Then, the first drive device drives the lifting shroud to descend, so that the lifting shroud fits over the impeller blade assembly. Subsequently, the air supply device pumps high-pressure airflow to the lifting shroud, which blows the impeller to rotate at high speed. At the same time, the detection sensors perform dynamic balancing tests on the rotating impeller, collect vibration data, and calculate the imbalance. After the test is completed, the first drive device drives the lifting shroud to rise, and then the air-floating clamp is lifted by the impeller lifting device. The impeller on the fixture is lifted up. Finally, the impeller is removed from the air-floating clamping fixture by the impeller pick-and-place device, and the impeller lifting device is reset at the same time. After the impeller is adjusted by adding / removing weight according to the test data, the impeller is placed on the impeller pick-and-place device, which automatically and accurately places the impeller on the air-floating clamping fixture. Then, the first drive device drives the lifting shroud to descend and move downward, so that the lifting shroud is fitted outside the impeller blade assembly. The lifting shroud blows the impeller to rotate at high speed, and the rotating impeller is dynamically balanced by the detection sensor. This process is repeated.

[0045] This impeller dynamic balancing testing equipment enables automatic impeller loading and unloading and dynamic balancing testing, effectively replacing manual labor. It not only ensures precise impeller loading and unloading but also accurate and reliable impeller testing, thereby making the dynamic balancing test of the impeller efficient and orderly, and greatly improving the testing efficiency and accuracy of the impeller. Attached Figure Description

[0046] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0047] Figure 1 This is a three-dimensional structural diagram of the impeller of the present invention installed on an air-floating clamping fixture.

[0048] Figure 2 This is another three-dimensional structural diagram of the impeller of the present invention installed on an air-float clamping fixture;

[0049] Figure 3 This is a cross-sectional structural schematic diagram of the impeller of the present invention installed on an air-float clamping fixture.

[0050] Figure 4 This is another cross-sectional view of the impeller of the present invention in the installation state on the air-float clamping fixture;

[0051] Figure 5 This is a cross-sectional view of the air-floating clamping fixture of the present invention.

[0052] Figure 6 This is a three-dimensional structural diagram of the inner mounting cylinder of the present invention;

[0053] Figure 7 This is a cross-sectional view of the inner mounting cylinder of the present invention;

[0054] Figure 8 This is a cross-sectional view of the wheel and axle sleeve of the present invention;

[0055] Figure 9 This is a cross-sectional view of the end cap of the present invention;

[0056] Figure 10 This is a schematic diagram of the locking ring structure of the present invention;

[0057] Figure 11 This is a schematic diagram of the impeller dynamic balancing test equipment of the present invention;

[0058] Figure 12 This is a schematic diagram of the installation structure of the air-floating clamping fixture, the lifting hood, and the detection sensor of the present invention.

[0059] Figure 13 This is a three-dimensional structural diagram of the impeller rotation drive and dynamic balance detection part of the present invention;

[0060] Figure 14 This is a schematic diagram of the left-hand structure of the impeller rotation drive and dynamic balance detection part of the present invention;

[0061] Figure 15 This is a cross-sectional view of the lifting hood of the present invention;

[0062] Figure 16 This is a schematic diagram of the impeller lifting device of the present invention;

[0063] Figure 17 This is a three-dimensional structural diagram of the impeller pick-up and drop device of the present invention;

[0064] Figure 18 This is another three-dimensional structural schematic diagram of the impeller pick-up and drop device of the present invention;

[0065] Reference numerals: 1-Outer fixing sleeve; 101-Mounting hole; 102-First air inlet hole; 103-Second air inlet hole; 104-Third air inlet hole;

[0066] 2-Inner mounting cylinder; 201-Fixing part; 2011-Strip hole; 202-First outer wall groove; 203-First vent hole; 204-Second outer wall groove; 205-First inner wall groove; 206-Third vent hole; 207-Third outer wall groove; 208-Second inner wall groove; 209-Fifth vent hole; 210-Sixth vent hole;

[0067] 3-Wheel axle sleeve; 301-Fourth vent hole; 302-Blow air hole;

[0068] 4-End cap; 401-Outer end face groove; 402-Inner end face groove; 403-Second vent hole; 404-Exhaust hole;

[0069] 5-Locking pressure ring; 501-Threaded connection part; 502-Tightening adjustment part; 5021-Anti-slip knurling;

[0070] 6-Crimp end plate; 7-First sealing ring; 8-Second sealing ring; 9-Third sealing ring; 10-Fourth sealing ring; 11-Central cavity; 12-Impeller;

[0071] 13-Rack; 14-Mounting base;

[0072] 15-First mounting plate; 16-First guide rail; 17-First slider; 18-Fan cover mounting plate; 19-First drive motor; 20-First lead screw; 21-First lead screw nut; 22-First detection plate; 23-First photoelectric sensor; 24-Lifting fan cover; 2401-Annular cavity; 2402-Air outlet; 25-Sensor mounting plate; 26-Detection sensor;

[0073] 27-Lifting base; 28-Lifting connecting plate; 29-Guide shaft; 30-Wheel axle push rod; 31-Lifting cylinder;

[0074] 32-Second mounting plate; 33-Second guide rail; 34-Second slider; 35-Lifting connecting plate; 36-Lifting mounting plate; 37-Second drive motor; 38-Second lead screw; 39-Second lead screw nut; 40-Second detection plate; 41-Second photoelectric sensor; 42-Third guide rail; 43-Third slider; 44-Transfer mounting plate; 45-Third drive motor; 46-Drive pulley; 47-Third lead screw; 48-Driven pulley; 49-Synchronous belt; 50-Third lead screw nut; 51-Third detection plate; 52-Third photoelectric sensor; 53-Gripper cylinder; 54-Wheel axle clamp. Detailed Implementation

[0075] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0076] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0077] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0078] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0079] like Figures 1 to 10 As shown in the figure, this embodiment provides an air-floating clamping fixture, including an outer fixing sleeve 1, an inner mounting cylinder 2 fixedly installed inside the outer fixing sleeve 1, a wheel axle sleeve 3 provided inside the inner mounting cylinder 2, the wheel axle sleeve 3 having a through hole for the wheel axle of the impeller 12 to be inserted, and an end cap 4 fixedly installed at the top of the inner mounting cylinder 2, and a locking pressure ring 5 threadedly installed at the bottom of the inner mounting cylinder 2, the wheel axle sleeve 3 being located between the end cap 4 and the locking pressure ring 5, and the two ends of the wheel axle sleeve 3 abutting against the end cap 4 and the locking pressure ring 5 respectively, the end cap 4 and the locking pressure ring 5 achieving limiting clamping of the wheel axle sleeve 3, fixing the wheel axle sleeve 3 inside the inner mounting cylinder 2.

[0080] like Figures 1 to 7 As shown, the top end of the inner mounting cylinder 2 extends to the outer fixing sleeve 1 and has an integrally formed fixing part 201. The fixing part 201 has a crimping end plate 6 on the side opposite to the outer fixing sleeve 1. The outer fixing sleeve 1 has a threaded hole. The crimping end plate 6 and the fixing part 201 have connection holes corresponding to the threaded holes. The crimping end plate 6, the fixing part 201 and the outer fixing sleeve 1 are fixedly connected by bolts. The end cap 4 is fixedly pressed between the crimping end plate 6 and the inner mounting cylinder 2.

[0081] In one embodiment, such as Figures 1 to 3 As shown, the outer fixing sleeve 1 has mounting holes 101. The mounting holes 101 are gourd-shaped holes and are located at the four corners of the outer fixing sleeve 1. The mounting holes 101 facilitate the installation and fixing of the air-floating clamping fixture.

[0082] In one embodiment, such as Figure 5 and Figure 7 As shown, the fixing part 201 has a receiving groove on the side facing the crimping end plate 6 that is adapted to the end cover 4. The end cover 4 is located in the receiving groove, and the crimping end plate 6 abuts against the outer end face of the end cover 4. In this way, the end cover 4 is pressed and fixed between the crimping end plate 6 and the inner mounting cylinder 2.

[0083] In one embodiment, such as Figure 5 and Figure 10 As shown, the locking ring 5 includes an integrally formed threaded connection part 501 and a screw adjustment part 502. The bottom end of the inner mounting cylinder 2 is provided with an internal thread, and the threaded connection part 501 is provided with an external thread that matches the internal thread at the bottom end of the inner mounting cylinder 2. The threaded connection part 501 is threadedly installed at the bottom end of the inner mounting cylinder 2 and abuts against the wheel bushing 3. The screw adjustment part 502 is located outside the inner mounting cylinder 2, and the outer peripheral wall of the screw adjustment part 502 is provided with anti-slip knurling 5021. The anti-slip knurling 5021 facilitates manual screwing of the locking ring 5, making the screw adjustment of the locking ring 5 convenient and labor-saving.

[0084] In one embodiment, such as Figure 5 As shown, in order to achieve a sealed connection between the outer fixing sleeve 1 and the inner mounting cylinder 2, a plurality of first sealing grooves are provided on the inner wall of the outer fixing sleeve 1. The plurality of first sealing grooves are opened along the axial direction of the inner wall of the outer fixing sleeve 1, and a first sealing ring 7 is installed in each of the first sealing grooves. The outer fixing sleeve 1 is sealed to the inner mounting cylinder 2 by means of the first sealing ring 7.

[0085] In one embodiment, such as Figure 5 As shown, in order to achieve a sealed connection between the inner mounting cylinder 2 and the wheel axle sleeve 3, a number of second sealing grooves are provided on the inner wall of the inner mounting cylinder 2. The number of second sealing grooves are arranged sequentially along the axial direction of the inner mounting cylinder 2. A second sealing ring 8 is installed in each of the second sealing grooves. The inner mounting cylinder 2 is sealed to the wheel axle sleeve 3 by means of the second sealing ring 8.

[0086] In one embodiment, such as Figure 5 As shown, in order to achieve a sealed connection between the end cap 4 and the top of the inner mounting cylinder 2 and the wheel axle sleeve 3, a third sealing groove is provided at the top of the inner mounting cylinder 2, and a third sealing ring 9 is installed in the third sealing groove. The end cap 4 is sealed to the inner mounting cylinder 2 by means of the third sealing ring 9. A fourth sealing groove is provided at the top of the wheel axle sleeve 3, and a fourth sealing ring 10 is installed in the fourth sealing groove. The end cap 4 is sealed to the wheel axle sleeve 3 by means of the fourth sealing ring 10.

[0087] In one embodiment, such as Figures 2 to 7 , Figure 9As shown, the end cover 4 has an outer end face groove 401 on the side opposite to the wheel shaft sleeve 3, and the outer fixing sleeve 1 has a first air inlet hole 102. The outer fixing sleeve 1, the inner mounting cylinder 2 and the end cover 4 have a first airflow channel connecting the first air inlet hole 102 and the outer end face groove 401. After the impeller 12 is installed on the air-floating clamping fixture, the top of the impeller shaft 12 will abut against the end cover 4 and cover the outer end face groove 401. High-pressure airflow is introduced through the first air inlet hole 102 of the outer fixing sleeve 1. The high-pressure airflow is transported to the outer end face groove 401 through the first airflow channel. The outer end face groove 401 acts on the impeller 12, applying an upward force to the impeller 12 to counteract the weight of the impeller 12. An air film is formed between the impeller shaft 12 and the end cover 4, which greatly reduces the contact friction between the impeller shaft 12 and the end cover 4.

[0088] Specifically, the outer wall of the inner mounting cylinder 2 has an annular first outer wall groove 202, which is located between two adjacent first sealing rings 7. The inner mounting cylinder 2 forms a first air chamber with the outer fixing sleeve 1 through the first outer wall groove 202, and the first air inlet hole 102 communicates with the first air chamber. The end cap 4 has an annular inner end face groove 402 on the side near the inner mounting cylinder 2, which is located between the third sealing ring 9 and the fourth sealing ring 10. The end cap 4 communicates with the inner end face groove 402 through the inner end face groove 402. A second air chamber is formed between the surface groove 402 and the inner mounting cylinder 2; a plurality of first air passage holes 203 are evenly opened on the top of the inner mounting cylinder 2 along its circumference, and the first air chamber is connected to the second air chamber through the first air passage holes 203; a plurality of second air passage holes 403 are evenly opened on the end cap 4 along its circumference, and the second air chamber is connected to the outer end surface groove 401 through the second air passage holes 403; the first air chamber, the first air passage hole 203, the second air chamber and the second air passage hole 403 are connected in sequence to form a first airflow channel. After the high-pressure airflow enters through the first air inlet 102, it enters the first air chamber, is evenly distributed to each of the first air passages 203, and then enters the second air chamber through the first air passages 203. After that, it is evenly distributed from the second air chamber to each of the second air passages 403, and then transported to the outer end face groove 401 through the second air passages 403. The outer end face groove 401 acts on the impeller shaft of the impeller 12 to counteract the gravity of the impeller 12. In addition, the inner end face groove 402 of the end cover 4 and the inner mounting cylinder 2 form a second air chamber. The second air chamber is connected to the first air passage 203 and the second air passage 403, so that when the end cover 4 is installed, it is not necessary to align the first air passage 203 and the second air passage 403 directly to achieve communication between them.

[0089] In one embodiment, such as Figures 1 to 8As shown, the top inner diameter of the wheel axle sleeve 3 is adapted to the top outer diameter of the impeller 12 shaft, and the bottom inner diameter of the wheel axle sleeve 3 is adapted to the tail outer diameter of the impeller 12 shaft. When in the test state, the wheel axle sleeve 3 and the middle part of the impeller 12 shaft form a central cavity 11. Air passage gaps are formed between the top of the wheel axle sleeve 3 and the top of the impeller 12 shaft, and between the bottom of the wheel axle sleeve 3 and the tail of the impeller 12 shaft. The outer fixed sleeve 1 is provided with a second air inlet hole 103. The outer fixed sleeve 1, the inner mounting cylinder 2 and the wheel axle sleeve 3 have a second airflow channel connecting the second air inlet hole 103 and the central cavity 11. After high-pressure airflow is introduced through the second air inlet hole 103 of the outer fixed sleeve 1, the high-pressure airflow is transported to the middle cavity 11 through the second airflow channel. After entering the middle cavity 11, the airflow flows upward and downward along the axial direction of the wheel sleeve 3, and passes through the air gap between the wheel sleeve 3 and the impeller 12 shaft, forming an air film between the impeller 12 shaft and the wheel sleeve 3, which greatly reduces the contact friction between the impeller 12 shaft and the wheel sleeve 3. The downward airflow is directly discharged to the outside after passing through the air gap formed between the bottom of the wheel sleeve 3 and the tail of the impeller 12 shaft.

[0090] Specifically, the outer wall of the inner mounting cylinder 2 has an annular second outer wall groove 204, which is located between two adjacent first sealing rings 7. The inner mounting cylinder 2 forms a third air chamber with the outer fixing sleeve 1 through the second outer wall groove 204, and the second air inlet hole 103 communicates with the third air chamber. The inner wall of the inner mounting cylinder 2 has an annular first inner wall groove 205, which is located between two adjacent second sealing rings 8. The first inner wall groove 205 is located in the middle of the inner mounting cylinder 2. The inner mounting cylinder 2 forms a fourth air chamber by being enclosed between the first inner wall groove 205 and the wheel axle sleeve 3; a number of third air passage holes 206 are evenly opened in the middle of the inner mounting cylinder 2 along its circumference, and the third air chamber is connected to the fourth air chamber through the third air passage holes 206; a number of fourth air passage holes 301 are evenly opened in the middle of the wheel axle sleeve 3 along its circumference, and the fourth air chamber is connected to the middle cavity 11 through the fourth air passage holes 301; the third air chamber, the third air passage holes 206, the fourth air chamber and the fourth air passage holes 301 are connected in sequence to form a second airflow channel. After the high-pressure airflow enters through the second air inlet 103, it enters the third air chamber, is evenly distributed to each of the third air passages 206, and then enters the fourth air chamber through the third air passages 206. After that, it is evenly distributed from the fourth air chamber to each of the fourth air passages 301, and then transported to the middle chamber 11 through the fourth air passages 301. After the airflow enters the middle chamber 11, it flows upward and downward along the axial direction of the wheel shaft sleeve 3, forming an air film that wraps around the impeller 12 shaft, thereby greatly reducing the contact friction between the impeller 12 shaft and the wheel shaft sleeve 3.

[0091] In one embodiment, such as Figures 1 to 8As shown, the top and bottom inner walls of the wheel axle sleeve 3 are evenly provided with several air blowing holes 302 along their circumference. The outer fixed sleeve 1 is provided with a third air inlet hole 104. There is a third airflow channel connecting the outer fixed sleeve 1, the inner mounting cylinder 2, and the wheel axle sleeve 3, which connects the third air inlet hole 104 and the air blowing holes 302. After the high-pressure airflow is introduced through the third air inlet hole 104 of the outer fixed sleeve 1, the high-pressure airflow is delivered to the air blowing hole 302 through the third airflow channel, and directly acts on the air gap between the wheel axle sleeve 3 and the impeller 12 shaft. It works together with the second airflow to form an air film between the impeller 12 shaft and the wheel axle sleeve 3, further reducing the contact friction between the impeller 12 shaft and the wheel axle sleeve 3.

[0092] Specifically, the outer wall of the inner mounting cylinder 2 has an annular third outer wall groove 207, which is located between two adjacent first sealing rings 7. The inner mounting cylinder 2 forms a fifth air chamber with the outer fixing sleeve 1 through the third outer wall groove 207, and the third air inlet hole 104 communicates with the fifth air chamber. The inner wall of the inner mounting cylinder 2 has an annular second inner wall groove 208, and there are two second inner wall grooves 208, which are located between two adjacent second sealing rings 8. The two second inner wall grooves 208 are located at the top and bottom of the inner mounting cylinder 2, respectively. The inner mounting cylinder 2 communicates with the outer fixing sleeve 1 through the second inner wall grooves 208. A sixth air chamber is formed by the wheel axle sleeve 3, with one sixth air chamber located at the top of the tooling and the other at the bottom of the tooling; several fifth air passages 209 are evenly opened along the circumference of the bottom of the inner mounting cylinder 2, and the fifth air chamber is connected to the sixth air chamber located at the bottom of the tooling through the fifth air passages 209. Several sixth air passages 210 are evenly opened along the circumference of the middle part of the inner mounting cylinder 2, and the two sixth air chambers are connected through the sixth air passages 210. The two sixth air chambers are respectively connected to the air blowing hole 302; the fifth air chamber, the fifth air passage 209, the sixth air chamber and the sixth air passage 210 form a third airflow channel. After the high-pressure airflow enters through the third air inlet 104, it enters the fifth air chamber, is evenly distributed to each of the fifth air passages 209, and enters the sixth air chamber at the bottom of the tooling through the fifth air passages 209. At the same time, it enters the sixth air chamber at the top of the tooling through the sixth air passage 210, and then is evenly distributed from the two sixth air chambers to each of the blowing holes 302, directly acting on the air passage gap between the impeller 12 shaft and the impeller 12 shaft, further reducing the contact friction between the impeller 12 shaft and the impeller 12 shaft and the impeller 12 shaft.

[0093] In one embodiment, such as Figures 1 to 7 , Figure 9As shown, the end cover 4 has a plurality of exhaust holes 404 evenly distributed along its circumference, and the fixing part 201 has a plurality of strip holes 2011 corresponding to the exhaust holes 404. In the test state, an exhaust chamber is formed between the end cover 4, the wheel bushing 3, and the top of the impeller 12 shaft. The exhaust chamber is connected to the strip holes 2011 through the exhaust holes 404. The high-pressure airflow rises from the air gap between the wheel bushing 3 and the impeller 12 shaft to the top of the fixture, and then enters the exhaust chamber. The exhaust chamber evenly distributes the airflow to each exhaust hole 404, and then enters the strip holes 2011 of the fixing part 201 through the exhaust holes 404 before being discharged to the outside.

[0094] Based on the above structure, this air-floating clamping fixture is compact and small in size. When performing dynamic balancing tests on the impeller 12, the impeller 12 is inserted into the fixture from top to bottom through its shaft. Then, high-pressure airflow is introduced through the air inlet holes of the outer fixed sleeve 1. The introduced airflow is divided into three paths: the first path of airflow is delivered to the outer end face groove 401 through the first airflow channel, and acts on the impeller 12 through the outer end face groove 401, applying an upward force to the impeller 12 to counteract the weight of the impeller 12, and forming an air film between the impeller shaft and the end cover 4, which greatly reduces the contact friction between the impeller shaft and the end cover 4; the second path of airflow is delivered to the middle cavity 11 through the second airflow channel, and flows upward and downward along the axial direction of the shaft sleeve 3, and passes through the shaft. The air gap between sleeve 3 and impeller 12 shaft forms an air film between the impeller 12 shaft and sleeve 3, greatly reducing the contact friction between the impeller 12 shaft and sleeve 3. The third airflow is delivered to the blowing hole 302 through the third airflow channel, directly acting on the air gap between the impeller 12 shaft and sleeve 3. Together with the second airflow, it forms an air film between the impeller 12 shaft and sleeve 3, further reducing the contact friction between the impeller 12 shaft and sleeve 3. The three airflows work together to counteract the gravity of the impeller 12 and reduce the contact friction between the impeller 12 and the tooling. Then, the impeller 12 is driven to rotate, and a dynamic balance test of the impeller 12 can be performed. After the test is completed, the impeller 12 can be removed from the tooling from bottom to top.

[0095] This air-floating clamping fixture can counteract the gravity of the impeller 12 and form an air film covering the impeller 12 shaft during dynamic balancing tests. This greatly reduces the contact friction between the impeller 12 and the clamping fixture, making it easier to drive the impeller 12 to rotate at high speed during dynamic balancing tests. It also effectively avoids the influence of contact friction on the dynamic balancing test of the impeller, resulting in higher accuracy of the dynamic balancing test of the impeller 12 and avoiding secondary damage to the impeller 12 that may be caused during the test. In addition, the impeller 12 can be installed and removed from the fixture by plugging and unplugging, which is simple and convenient and greatly improves the testing efficiency of the impeller 12.

[0096] like Figures 11 to 18 As shown in the figure, this embodiment also discloses an impeller dynamic balancing test device, including the aforementioned air-floating clamping fixture, and a frame 13. The air-floating clamping fixture is vertically fixed to the frame 13 by an outer fixing sleeve 1, and a lifting hood 24 for driving the impeller 12 to rotate is provided above the air-floating clamping fixture. The lifting hood 24 is connected to an air supply device, and the lifting hood 24 is slidably installed on the frame 13 in the vertical direction and driven by a first driving device. Above the lifting hood 24 is a device for realizing the dynamic balancing of the impeller. The detection sensor 26 performs a dynamic balance test on the impeller 12 to be tested. The impeller 12 is placed on the air-floating clamping fixture. Then, the first drive device drives the lifting shroud 24 to descend, so that the lifting shroud 24 is fitted over the blade assembly of the impeller 12. After that, the air supply device pumps high-pressure airflow to the lifting shroud 24, which blows the impeller 12 to rotate at high speed. At the same time, the detection sensor 26 performs a dynamic balance test on the rotating impeller 12, collects vibration data, calculates the unbalance, and realizes the dynamic balance test of the impeller 12.

[0097] In some embodiments, such as Figure 11 and Figure 12 As shown, in order to install and fix the air-floating clamping fixture on the frame 13, a mounting base 14 is fixedly installed on the frame 13, and the outer fixing sleeve 1 is fixedly installed on the mounting base 14 by screws passing through its mounting hole 101.

[0098] In some embodiments, the air supply device may be an air source device such as an air compressor, which is connected to the lifting hood 24 via an air supply pipe. The air supply device is a conventional technical means known to those skilled in the art, so it will not be described in detail here.

[0099] Specifically, such as Figures 12 to 14 As shown, a shroud mounting plate 18 driven by a first drive device is slidably mounted on the frame 13 in the vertical direction. A lifting shroud 24 is fixedly mounted on the bottom of the shroud mounting plate 18, and the lifting shroud 24 has an annular cylindrical structure. Several inclined air outlet holes 2402 are evenly opened on the inner wall of the lifting shroud 24 along its circumference. When in the test state, the impeller 12 is inserted into the air-floating clamping fixture, and the lifting shroud 24 is fitted outside the blade assembly of the impeller 12. The axial direction of the air outlet hole 2402 is consistent with the air-facing angle of the impeller 12 blades. A sensor mounting plate 25 is fixedly mounted on the top of the shroud mounting plate 18, and a detection sensor 26 is fixedly mounted on the sensor mounting plate 25. The detection sensor 26 is correspondingly set with the lifting shroud 24. The first drive device drives the shroud mounting plate 18 to rise and fall, so as to realize the synchronous rise and fall of the lifting shroud 24 and the detection sensor 26.

[0100] In one embodiment, such as Figure 13 and Figure 15As shown, the lifting hood 24 has an annular cavity 2401 inside, and several air outlets 2402 are connected to the annular cavity 2401. The outer wall of the lifting hood 24 is also provided with an air inlet connected to the annular cavity 2401. The air supply pipe is connected to the annular cavity 2401 through the air inlet. After the air source enters the annular cavity 2401 of the lifting hood 24 through the air supply pipe, it is evenly sprayed out from each air outlet. The airflow formed blows the blades of the impeller 12, driving the impeller 12 to rotate at high speed.

[0101] Understandably, the air outlet is tilted so that the axis of the air outlet is aligned with the angle of attack of the blades of the impeller 12, thereby allowing the airflow to impact the effective force-bearing surface of the blades vertically or nearly vertically, thus driving the impeller 12 to rotate at high speed.

[0102] In one embodiment, such as Figure 13 and Figure 14 As shown, a first mounting plate 15 is fixedly mounted on the frame 13, a first guide rail 16 is fixedly mounted on the first mounting plate 15 along the vertical direction, a first slider 17 is slidably mounted on the first guide rail 16, the first slider 17 is fixedly connected to the fan cover mounting plate 18, and the fan cover mounting plate 18 is slidably mounted on the first mounting plate 15 through the first guide rail 16 and the first slider 17; the first driving device includes a first driving motor 19 fixedly mounted on the top of the first mounting plate 15, a first lead screw 20 rotatably mounted on the first mounting plate 15 and arranged parallel to the first guide rail 16, the output shaft of the first driving motor 19 is connected to one end of the first lead screw 20, and a first lead screw nut 21 is threadedly mounted on the first lead screw 20, and the first lead screw nut is fixedly connected to the fan cover mounting plate 18. The first drive motor 19 operates, driving the first lead screw 20 to rotate. Since the first lead screw 20 is threadedly connected to the first lead screw nut 21, and the first lead screw nut is fixedly connected to the hood mounting plate 18, the rotation of the first lead screw 20 drives the hood mounting plate 18 to move up and down, thereby realizing the up and down movement of the hood 24 and the detection sensor 26.

[0103] In one embodiment, a first detection plate 22 is fixedly installed on the hood mounting plate 18, and a first photoelectric sensor 23 for detecting the first detection plate 22 is fixedly installed on the first mounting plate 15. Through the first photoelectric sensor 23 and the first detection plate 22, the lifting hood 24 is ensured to move up and down within a set stroke range.

[0104] In one embodiment, such as Figure 11 As shown, in order to make the testing of impeller 12 more efficient and orderly, an impeller lifting device is provided below the air-floating clamping fixture, and an impeller picking and placing device for picking up and placing impeller 12 is also provided on one side of the air-floating clamping fixture. Through the cooperation of the impeller lifting device and the impeller picking and placing device, the impeller 12 can be accurately and automatically picked up and placed on the air-floating clamping fixture.

[0105] In one specific embodiment, such as Figure 11 and Figure 16 As shown, the impeller lifting device includes a lifting base 27 fixedly installed on the frame 13. A wheel shaft lift rod 30 driven by a second drive device is slidably installed on the lifting base 27 in the vertical direction. When in the test state, the wheel shaft lift rod 30 is set corresponding to the wheel shaft of the impeller 12. After the impeller 12 is tested, the second drive device works to drive the wheel shaft lift rod 30 to rise and displace, which can lift the impeller 12 from the air-floating clamping fixture.

[0106] Specifically, a lifting connecting plate 28 is provided above the lifting base 27. A guide shaft 29 is slidably mounted on the lifting base 27 in the vertical direction using linear bearings. The top end of the guide shaft 29 is fixedly connected to the lifting connecting plate 28. The lifting connecting plate 28 is slidably mounted on the lifting base 27 via the linear bearings and the guide shaft 29. The wheel axle push rod 30 is fixedly mounted on the side of the lifting connecting plate 28 facing the air-floating clamping fixture. The second driving device includes a lifting cylinder 31 fixedly mounted on the lifting base 27. The piston shaft end of the lifting cylinder 31 is connected to the lifting connecting plate 28. When the lifting cylinder 31 operates, it drives the lifting connecting plate 28 to rise, thereby driving the wheel axle push rod 30 to rise. The wheel axle push rod 30 pushes against the tail end of the impeller 12's axle, lifting the impeller 12 upward from within the air-floating clamping fixture.

[0107] like Figure 11 , Figure 17 and Figure 18As shown, the impeller pick-and-place device includes a lifting mounting plate 36 that is slidably mounted on the frame 13 in the vertical direction and driven by a third drive device. A translation mounting plate 44 driven by a fourth drive device is slidably mounted on the lifting mounting plate 36 in the horizontal direction. A gripper cylinder 53 for clamping the impeller 12 is fixedly mounted on the translation mounting plate 44. The gripper cylinder 53 is located between the air-floating clamping fixture and the lifting hood 24, and a shaft clamp 54 adapted to the shaft of the impeller 12 is fixedly mounted on the gripper fingers of the gripper cylinder 53. After the impeller lifting device lifts the impeller 12 from the air-floating clamping fixture, the third drive device drives the gripper cylinder 53 to descend, and then the fourth drive device drives the gripper cylinder 53 to move horizontally, sending it to a position directly opposite the impeller 12's shaft. At this point, the impeller 12's shaft is located between the two shaft clamps 54. Then, the gripper cylinder 53 operates, driving the two shaft clamps 54 to clamp the impeller 12. Next, the third drive device drives the gripper cylinder 53 to rise, removing the impeller 12 from the air-floating clamping fixture. Simultaneously, the lifting cylinder 31 drives the shaft push rod 30 to descend and reset. Finally, the fourth drive device drives the gripper cylinder 53 to move horizontally and reset, causing the gripper cylinder 53 to loosen the impeller 12 to a certain extent while still supporting it. At this point, the worker can remove the impeller... 12 can be removed from the wheel shaft clamp 54 of the gripper cylinder 53; when testing the impeller 12, place the impeller 12 to be tested between the two wheel shaft clamps 54, then the gripper cylinder 53 operates to clamp the impeller 12 through the wheel shaft clamp 54. After that, the fourth drive device drives the gripper cylinder 53 to move horizontally, sending the impeller 12 directly above the air-floating clamping fixture. Then, the third drive device drives the gripper cylinder 53 to move downward, placing the impeller 12 inside the air-floating clamping fixture. Finally, the gripper cylinder 53 operates to drive the wheel shaft clamp 54 to release the impeller 12, and the impeller 12 automatically falls into the air-floating clamping fixture. In this way, the automatic and accurate placement of the impeller 12 in the air-floating clamping fixture can be completed. After the impeller 12 is placed, the third and fourth drive devices cooperate to drive the gripper cylinder 53 to reset.

[0108] In one embodiment, a second mounting plate 32 is fixedly mounted on the frame 13. A second guide rail 33 is fixedly mounted on the second mounting plate 32 along the vertical direction. A second slider 34 is slidably mounted on the second guide rail 33. A lifting connecting plate 35 is fixedly mounted on the second slider 34. The lifting connecting plate 35 is slidably mounted on the second mounting plate 32 via the second guide rail 33 and the second slider 34. A lifting mounting plate 36 is fixedly mounted on the lifting connecting plate 35. The third driving device includes a second driving motor 37 fixedly mounted on the top of the second mounting plate 32. A second lead screw 38, parallel to the second guide rail 33, is rotatably mounted on the second mounting plate 32. The output shaft of the second driving motor 37 is connected to one end of the second lead screw 38, and a second lead screw nut 39 is threadedly mounted on the second lead screw 38. The second lead screw nut 39 is fixedly connected to the lifting connecting plate 35. When the second driving motor 37 operates, it drives the second lead screw 38 to rotate, thereby driving the lifting connecting plate 35 and the lifting mounting plate 36 to rise and fall, thus realizing the lifting drive of the gripper cylinder 53.

[0109] In one embodiment, a second detection plate 40 is fixedly installed on the lifting connecting plate 35, and a second photoelectric sensor 41 for detecting the second detection plate 40 is fixedly installed on the second mounting plate 32. The second photoelectric sensor 41 and the second detection plate 40 ensure that the gripper cylinder 53 moves up and down within a set stroke range.

[0110] In one embodiment, a third guide rail 42 is fixedly mounted on the lifting mounting plate 36 along the horizontal direction, and a third slider 43 is slidably mounted on the third guide rail 42. The third slider 43 is fixedly connected to the translation mounting plate 44, and the translation mounting plate 44 is slidably mounted on the lifting mounting plate 36 through the third guide rail 42 and the third slider 43. The fourth driving device includes a third drive motor 45 fixedly mounted on the lifting mounting plate 36, a drive pulley 46 mounted on the output shaft of the third drive motor 45, a third lead screw 47 rotatably mounted on the lifting mounting plate 36 and arranged parallel to the third guide rail 42, a driven pulley 48 mounted on one end of the third lead screw 47, a synchronous belt 49 is wound between the driven pulley 48 and the drive pulley 46, and the driven pulley 48 is connected to the drive pulley 46 through the synchronous belt 49. A third lead screw nut 50 is threadedly mounted on the third lead screw 47, and the third lead screw nut 50 is fixedly connected to the translation mounting plate 44. The third drive motor 45 operates, driving the third lead screw 47 to rotate via the active pulley 46, the synchronous belt 49, and the driven pulley 48, thereby causing the translational mounting plate 44 to move horizontally and achieving translational drive of the gripper cylinder 53.

[0111] In one embodiment, a third detection plate 51 is fixedly installed on the translational mounting plate 44, and a third photoelectric sensor 52 for detecting the third detection plate 51 is fixedly installed on the lifting mounting plate 36. Through the third photoelectric sensor 52 and the third detection plate 51, the gripper cylinder 53 is ensured to move horizontally within a set stroke, thereby moving closer to or further away from the impeller 12 in the horizontal direction.

[0112] Based on the above structure, the impeller dynamic balancing test equipment has a high degree of automation. During operation, the impeller 12 to be tested is placed on the air-floating clamping fixture. Then, the first drive device drives the lifting shroud 24 to descend, so that the lifting shroud 24 is fitted over the blade assembly of the impeller 12. Afterward, the air supply device pumps high-pressure airflow to the lifting shroud 24, which blows the impeller 12 to rotate at high speed. At the same time, the detection sensor 26 performs dynamic balancing tests on the rotating impeller 12, collects vibration data, and calculates the imbalance. After the test is completed, the first drive device drives the lifting shroud 24 to rise, and then the air-floating fixture is lifted by the impeller lifting device. The impeller 12 is lifted from the clamping fixture. Finally, the impeller 12 is removed from the air-floating clamping fixture by the impeller pick-and-place device. At the same time, the impeller lifting device is reset. After the impeller 12 is adjusted by adding / removing weight according to the test data, the impeller 12 is placed in the impeller pick-and-place device. The impeller 12 is automatically and accurately placed on the air-floating clamping fixture by the impeller pick-and-place device. Then, the first drive device drives the lifting fan shroud 24 to descend, so that the lifting fan shroud 24 is fitted outside the blade assembly of the impeller 12. The lifting fan shroud 24 blows the impeller 12 to rotate at high speed, and the detection sensor 26 is used to perform a dynamic balance test on the rotating impeller 12. This process is repeated.

[0113] This impeller dynamic balancing testing equipment enables automatic pick-up and drop-off and dynamic balancing testing of the impeller 12, effectively replacing manual labor. It not only ensures precise pick-up and drop-off of the impeller 12, but also makes the testing of the impeller 12 accurate and reliable, thus making the dynamic balancing test of the impeller 12 efficient and orderly, and greatly improving the testing efficiency and accuracy of the impeller 12.

[0114] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the invention. Furthermore, it should be understood that after reading the technical description of this invention, those skilled in the art can make various alterations, modifications, and / or variations to the invention, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. An air-floating clamping fixture, characterized in that, Includes an outer fixing sleeve (1), an inner mounting cylinder (2) is fixedly installed inside the outer fixing sleeve (1), a wheel axle sleeve (3) is provided inside the inner mounting cylinder (2), and an end cap (4) is fixedly installed at the top of the inner mounting cylinder (2). A locking pressure ring (5) is threadedly installed at the bottom end of the inner mounting cylinder (2). The wheel axle sleeve (3) is located between the end cap (4) and the locking pressure ring (5), and the two ends of the wheel axle sleeve (3) abut against the end cap (4) and the locking pressure ring (5) respectively. The end cap (4) has an outer end face groove (401) on the side opposite to the wheel axle sleeve (3), and the outer fixing sleeve (1) has a first air inlet hole (102). The outer fixing sleeve (1), the inner mounting cylinder (2) and the end cap (4) have a first airflow channel connecting the first air inlet hole (102) and the outer end face groove (401). The top inner diameter of the wheel axle sleeve (3) is adapted to the top outer diameter of the impeller (12) shaft, and the bottom inner diameter of the wheel axle sleeve (3) is adapted to the tail outer diameter of the impeller (12) shaft. When in the test state, the wheel axle sleeve (3) and the middle part of the impeller (12) shaft form a cavity (11). An air passage gap is formed between the top of the wheel axle sleeve (3) and the top of the impeller (12) shaft, and between the bottom of the wheel axle sleeve (3) and the tail of the impeller (12) shaft. The outer fixing sleeve (1) is provided with a second air inlet hole (103), and the outer fixing sleeve (1), the inner mounting cylinder (2) and the wheel axle sleeve (3) have a second airflow channel connecting the second air inlet hole (103) and the middle cavity (11); The top and bottom inner walls of the wheel axle sleeve (3) are evenly provided with a plurality of air blowing holes (302) along their circumference. The outer fixed sleeve (1) is provided with a third air inlet hole (104). The outer fixed sleeve (1), the inner mounting cylinder (2) and the wheel axle sleeve (3) have a third airflow channel connecting the third air inlet hole (104) and the air blowing hole (302). The outer wall of the inner mounting cylinder (2) is provided with an annular first outer wall groove (202). The inner mounting cylinder (2) and the outer fixing sleeve (1) are surrounded by the first outer wall groove (202) to form a first air cavity. The first air inlet hole (102) is connected to the first air cavity. The end cap (4) has an annular inner end face groove (402) on the side near the inner mounting cylinder (2), and the end cap (4) forms a second air cavity between the inner end face groove (402) and the inner mounting cylinder (2). The top of the inner mounting cylinder (2) is evenly provided with a plurality of first air passage holes (203) along its circumference. The first air chamber is connected to the second air chamber through the first air passage holes (203). The end cap (4) is evenly provided with a plurality of second air passage holes (403) along its circumference. The second air chamber is connected to the outer end face groove (401) through the second air passage holes (403). The first air chamber, the first air passage (203), the second air chamber and the second air passage (403) are connected in sequence to form the first airflow channel; The outer wall of the inner mounting cylinder (2) is provided with an annular second outer wall groove (204). The inner mounting cylinder (2) and the outer fixing sleeve (1) are surrounded by the second outer wall groove (204) to form a third air chamber. The second air inlet hole (103) is connected to the third air chamber. The inner wall of the inner mounting cylinder (2) is provided with an annular first inner wall groove (205). The first inner wall groove (205) is located in the middle of the inner mounting cylinder (2). The inner mounting cylinder (2) forms a fourth air chamber between the inner mounting cylinder (2) and the wheel bushing (3) through the first inner wall groove (205). The inner mounting cylinder (2) has a plurality of third air passages (206) evenly opened in the middle along its circumference. The third air chamber is connected to the fourth air chamber through the third air passages (206). The wheel bushing (3) has a plurality of fourth air passages (301) evenly opened in the middle along its circumference. The fourth air chamber is connected to the middle cavity (11) through the fourth air passages (301). The third air chamber, the third air passage (206), the fourth air chamber and the fourth air passage (301) are connected in sequence to form the second airflow channel; The outer wall of the inner mounting cylinder (2) is provided with an annular third outer wall groove (207). The inner mounting cylinder (2) and the outer fixing sleeve (1) are surrounded by the third outer wall groove (207) to form a fifth air chamber. The third air inlet hole (104) is connected to the fifth air chamber. The inner wall of the inner mounting cylinder (2) is provided with an annular second inner wall groove (208). The second inner wall groove (208) is located at the top and bottom of the inner mounting cylinder (2). The inner mounting cylinder (2) forms a sixth air chamber with the wheel axle sleeve (3) through the second inner wall groove (208). The bottom of the inner mounting cylinder (2) is evenly provided with a plurality of fifth air passage holes (209) along its circumference. The fifth air chamber is connected to the sixth air chamber through the fifth air passage holes (209). The middle part of the inner mounting cylinder (2) is evenly provided with a plurality of sixth air passage holes (210) along its circumference. The two sixth air chambers are connected through the sixth air passage holes (210). The two sixth air chambers are respectively connected to the air blowing hole (302). The fifth air chamber, the fifth air passage (209), the sixth air chamber, and the sixth air passage (210) form the third airflow channel.

2. The air-floating clamping fixture according to claim 1, characterized in that, The top end of the inner mounting cylinder (2) extends to the outer fixing sleeve (1) and has an integrally formed fixing part (201). The fixing part (201) is provided with a crimping end plate (6) on the side away from the outer fixing sleeve (1). The crimping end plate (6), the fixing part (201) and the outer fixing sleeve (1) are fixedly connected by bolts. The end cap (4) is fixedly pressed between the crimping end plate (6) and the inner mounting cylinder (2). The locking ring (5) includes an integrally formed threaded connection part (501) and a screw adjustment part (502). The threaded connection part (501) is threadedly installed on the bottom end of the inner mounting cylinder (2) and abuts against the wheel bushing (3). The screw adjustment part (502) is located outside the inner mounting cylinder (2), and the outer peripheral wall of the screw adjustment part (502) is provided with anti-slip knurling (5021).

3. The air-floating clamping fixture according to claim 2, characterized in that, The inner wall of the outer fixing sleeve (1) is provided with a plurality of first sealing grooves, and a first sealing ring (7) is installed in each of the first sealing grooves. The outer fixing sleeve (1) is sealed to the inner mounting cylinder (2) by means of the first sealing ring (7). The inner wall of the inner mounting cylinder (2) is provided with a plurality of second sealing grooves, and a second sealing ring (8) is installed in each of the second sealing grooves. The inner mounting cylinder (2) is sealed to the wheel bushing (3) by means of the second sealing ring (8). The top end of the inner mounting cylinder (2) is provided with a third sealing groove, and a third sealing ring (9) is installed in the third sealing groove. The end cap (4) is sealed to the inner mounting cylinder (2) by means of the third sealing ring (9). The top end of the wheel axle sleeve (3) is provided with a fourth sealing groove, and a fourth sealing ring (10) is installed in the fourth sealing groove. The end cover (4) is sealed to the wheel axle sleeve (3) by means of the fourth sealing ring (10).

4. The air-floating clamping fixture according to claim 2, characterized in that, The end cap (4) is evenly provided with a plurality of exhaust holes (404) along its circumference, and the fixing part (201) is provided with a plurality of strip holes (2011) corresponding to the exhaust holes (404). When in the test state, the end cap (4), the wheel bushing (3) and the top of the wheel shaft of the impeller (12) form an exhaust chamber, and the exhaust chamber is connected to the strip holes (2011) through the exhaust holes (404).

5. A dynamic balancing testing device for impellers, characterized in that: The device includes the air-floating clamping fixture as described in claim 1, and also includes a frame (13). The air-floating clamping fixture is vertically fixed on the frame (13) through the outer fixing sleeve (1). A lifting hood (24) for driving the impeller (12) to rotate is provided above the air-floating clamping fixture. The lifting hood (24) is connected to the air supply device. The lifting hood (24) is slidably installed on the frame (13) in the vertical direction and driven by the first driving device. A detection sensor (26) for realizing the dynamic balance detection of the impeller (12) is provided above the lifting hood (24). The air-floating clamping fixture is provided with an impeller lifting device below it, and an impeller picking and placing device for picking up and placing the impeller (12) is also provided on one side of the air-floating clamping fixture.

6. The impeller dynamic balancing testing equipment according to claim 5, characterized in that, The frame (13) is slidably mounted on the wind cover mounting plate (18) driven by the first drive device. The lifting wind cover (24) is fixedly mounted on the bottom of the wind cover mounting plate (18). The lifting wind cover (24) is an annular cylindrical structure. The inner wall of the lifting wind cover (24) is evenly provided with several inclined air outlet holes (2402) along its circumference. When in the test state, the impeller (12) is inserted into the air-floating clamping fixture. The lifting wind cover (24) is fitted outside the blade assembly of the impeller (12). The axial direction of the air outlet hole (2402) is consistent with the blade angle of the impeller (12). A sensor mounting plate (25) is fixedly installed on the top of the hood mounting plate (18), and the detection sensor (26) is fixedly installed on the sensor mounting plate (25), and the detection sensor (26) is correspondingly set with the lifting hood (24).

7. The impeller dynamic balancing testing equipment according to claim 5, characterized in that, The impeller lifting device includes a lifting base (27) fixedly installed on the frame (13). A wheel shaft top rod (30) driven by a second driving device is slidably installed on the lifting base (27) in the vertical direction. When in the test state, the wheel shaft top rod (30) is set to correspond with the wheel shaft of the impeller (12). The impeller pick-and-place device includes a lifting mounting plate (36) that is slidably mounted on the frame (13) in the vertical direction and driven by a third drive device. A translation mounting plate (44) driven by a fourth drive device is slidably mounted on the lifting mounting plate (36) in the horizontal direction. A gripper cylinder (53) for clamping the impeller (12) is fixedly mounted on the translation mounting plate (44). The gripper cylinder (53) is located between the air-floating clamping fixture and the lifting hood (24). A shaft clamp (54) adapted to the shaft of the impeller (12) is fixedly mounted on the gripper fingers of the gripper cylinder (53).

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