General detection device and method for static balance of rotary body

Abstract

The invention discloses a general detection device and method for static balance of a rotary body. Comprising a balance base (1), a pair of balance vertical plates (4) are installed on the balance base (1), knife-edge-shaped guide rails (7) are arranged on the tops of the balance vertical plates (4), and a balance mandrel (5) is arranged on the two knife-edge-shaped guide rails (7) in a rolling mode. According to the invention, the problem of eccentricity of the impeller during casting processing, especially after the balance mass is increased or reduced, can be effectively solved, and the technical problems of low processing efficiency, processing quality and processing qualification rate of rotary products such as the impeller and a turbine are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a universal detection device and method for static balance of a rotating body. Background Art

[0002] The impeller is an important component of aerospace refrigeration equipment. The part is processed as a whole by casting. The purpose of static balancing the impeller during the machining process is to eliminate the phenomenon of large spindle swing, large bearing wear or large component vibration caused by the inaccurate casting or machining of the impeller during production, which makes the impeller center and the geometric center inconsistent. At present, the static balancing test process of the impeller mainly relies on a double-top mandrel with a single precision size on a simple flat-nose pliers, which has low balancing efficiency and poor balancing accuracy, seriously affecting the processing quality and efficiency of the impeller, and resulting in a high scrap rate. Summary of the invention

[0003] The purpose of the present invention is to provide a universal detection device and method for static balance of a rotating body. The present invention can effectively solve the eccentricity problem of the impeller during casting, especially after increasing or reducing the balancing mass, and solve the technical problems of low processing efficiency, processing quality and processing qualification rate of rotating products such as impellers and turbines.

[0004] The technical solution of the present invention is: a universal detection device for static balance of a rotating body, including a balancing base, a pair of balancing vertical plates are installed on the balancing base, knife-edge guide rails are arranged on the top of the balancing vertical plates, and balancing core shafts are rollingly arranged on the two knife-edge guide rails.

[0005] In the aforementioned universal detection device for static balance of a rotating body, the balancing mandrel includes more than one, and the diameters D of the matching circular surfaces of the balancing mandrels and the clearance between the central holes of the rotating body differ by 0.002 to 0.005 mm.

[0006] In the aforementioned universal detection device for static balance of a rotating body, stop pins are provided at both ends of the knife-edge guide rail.

[0007] In the aforementioned universal detection device for static balance of a rotating body, the top of the balance vertical plate is connected to the knife-edge guide rail via a transition step.

[0008] In the aforementioned universal detection device for static balance of a rotating body, a pair of bosses A are provided on the upper surface of the balancing base; and the balancing vertical plate is connected to the bosses A.

[0009] In the aforementioned universal detection device for static balance of a rotating body, a pair of bosses B are provided on the lower surface of the balancing base.

[0010] In the aforementioned universal detection device for static balance of a rotating body, a leveling screw is also installed on the balancing base.

[0011] In the aforementioned universal detection device for static balance of a rotating body, the leveling screw is threadedly connected to the locking nut.

[0012] The detection method of the aforementioned universal detection device for static balance of a rotating body is as follows: level the balancing base; measure the size of the center hole of the rotating body to be detected, and select a balancing mandrel of corresponding accuracy according to the measured size to assemble it; after assembly, place the balancing mandrel on two knife-edge guide rails, gently push the rotating body repeatedly and then release it, and observe the rolling of the balancing mandrel; when the balancing mandrel stops after moving a certain distance on the two knife-edge guide rails, it is judged that the static balance of the rotating body is qualified; when the balancing mandrel swings back and forth on the two knife-edge guide rails, the static balance of the rotating body is unqualified.

[0013] In the detection method of the aforementioned universal detection device for static balance of a rotating body, when the static balance of the rotating body fails to meet the requirements, the center of mass of the rotating body is located below the balancing core shaft. At this time, glue is taken and pasted on the opposite direction of the center of mass of the rotating body, and the detection is continued until the static balance of the rotating body meets the requirements. At this time, the glue is removed and the position is recorded to determine the balance quality.

[0014] The advantages of the present invention are: compared with the traditional simple static balance detection device (see Figure 5 ), the static balancing universal detection device of the present invention can easily ensure the accuracy of the balancing base, and the designed balancing vertical plate is provided with a knife-shaped guide rail, and the double knife edges are parallel to each other in the same plane. The balancing core shaft can move without resistance on the knife edge track, the balancing accuracy is high, and the balancing process is stable.

[0015] Compared with the traditional simple static balance detection device, the present invention can set a universal support frame (i.e., balance base, balance vertical plate) according to the limit size range of rotating bodies such as impellers and turbines, ensuring full coverage of products and strong versatility of the device. In subsequent product testing, only the corresponding balance core shaft needs to be designed and processed, and the processing cost is low.

[0016] Compared with the traditional simple static balance detection method, the present invention arranges several different core shafts with a tolerance accuracy of 0.002-0.005mm to assemble with the center holes of rotating bodies such as impellers and turbines, and the assembly accuracy is fully covered, effectively ensuring the static balance detection quality and detection accuracy of the rotating body.

[0017] Compared with the traditional simple static balance detection method, the present invention uses clay instead of the balancing mass to stick it to the appropriate position (such as a symmetrical position) in the opposite direction of the impeller's center of mass. The adjustment process only requires adjusting the amount or position of the clay, which effectively reduces the scrap rate of the rotating body product.

[0018] Compared with the traditional simple static balance detection method, the present invention is compared with the use effect of multiple products, and the parameters in Table 1 are obtained.

[0019] Table 1

[0020]

[0021] In summary, the present invention has a simple structure, reasonable design, low processing cost, strong practicality, can effectively improve the balancing efficiency of the impeller, and the balancing quality and balancing process are stable and reliable, which can effectively reduce the scrap rate of rotating bodies such as impellers and turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a universal detection device for static balance of a rotating body of the present invention;

[0023] Figure 2 This is the cross-sectional view of the balance base;

[0024] Figure 3 It is a cross-sectional view of the balancing mandrel;

[0025] Figure 4 Schematic diagram of the centroid position of the universal detection method for static balance of an impeller of the present invention;

[0026] Figure 5 It is a traditional simple static balance detection device. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] Example 1. A general detection device and method for static balance of a rotating body, see Figure 1-4 The invention comprises a balancing base 1, a pair of balancing vertical plates 4 are installed on the balancing base 1, a knife-shaped guide rail 7 is arranged on the top of the balancing vertical plate 4, and a balancing mandrel 5 is rotatably arranged on the two knife-shaped guide rails 7. The knife-shaped guide rails are convenient for reducing the friction resistance on the guide rails.

[0031] The aforementioned balancing mandrel 5 includes more than one, and the diameters D of the matching circular surfaces 11 of the balancing mandrel 5 and the central hole of the rotating body are 0.002-0.005 mm different from each other. Generally, the number of the balancing mandrel 5 is 5-10.

[0032] Stop pins 6 are provided at both ends of the aforementioned knife-edge guide rail 7, which are used to stop the balancing mandrel 5 and prevent the balancing mandrel 5 from falling off during the balancing test.

[0033] The top of the aforementioned balancing vertical plate 4 is connected to the knife-edge guide rail 7 via a transition step 8. The transition step 8 can reduce the stress concentration between the balancing vertical plate 4 and the knife-edge guide rail 7, prevent the knife-edge guide rail 7 from being deformed by the heavy weight rotating body to be detected, and ultimately increase the supporting rigidity of the balancing vertical plate 4 and the stability of the device.

[0034] The upper surface of the aforementioned balancing base 1 is provided with a pair of bosses A9, and the balancing vertical plate 4 is connected to the bosses A9. The bosses A9 are more conducive to ensuring the coplanarity of processing, so as to ensure that the butt joint surfaces of the two balancing vertical plates 4 and the balancing base 1 are coplanar.

[0035] A pair of bosses B10 are provided on the lower surface of the aforementioned balancing base 1. The design of the bosses A and B facilitates ensuring the accuracy and parallelism of the upper and lower surfaces of the balancing base 1.

[0036] The aforementioned balancing base 1 is also provided with leveling screws 3. Two leveling screws 3 are distributed on one side of the balancing base 1 and one on the other side, so as to facilitate leveling by forming a plane with three points.

[0037] The aforementioned leveling screw 3 is threadedly connected to the locking nut 2 .

[0038] The detection method of the aforementioned universal detection device for static balance of a rotating body is as follows: the balancing base 1 is leveled, and after leveling, the locking nut 2 is used to lock the leveling screw 3; the size of the center hole of the rotating body 12 to be detected is measured, and a balancing mandrel 5 of corresponding accuracy is selected according to the measured size for assembly therewith; after assembly, the balancing mandrel 5 is placed on two knife-edge-shaped guide rails 7, the rotating body 12 is gently pushed repeatedly and then released, and the rolling of the balancing mandrel 5 is observed; when the balancing mandrel 5 stops after moving a certain distance on the two knife-edge-shaped guide rails 7, it is judged that the static balance of the rotating body 12 is qualified; when the balancing mandrel 5 swings back and forth on the two knife-edge-shaped guide rails 7, the static balance of the rotating body 12 is unqualified.

[0039] When the static balance of the rotating body 12 fails, the center of mass of the rotating body 12 is located below the balancing mandrel 5. At this time, glue is pasted on the opposite direction of the center of mass of the rotating body 12, and the test is continued until the static balance of the rotating body 12 passes. At this time, the glue is removed and the position is recorded to determine the balance quality. In particular, the static balance can be adjusted by adding mass at the opposite direction of the center of mass, and the static balance can be adjusted by removing material at the center of mass if necessary.

[0040] Example 2. Combination Figure 1-4 The specific use process of the universal detection device and method for static balance of a rotating body provided by the present invention includes taking a certain batch of impeller products as an example:

[0041] 1. Place the above device on the detection platform, turn the knob to adjust the screw 3, and use a level to measure the parallelism and flatness of the knife-edge guide rail at the top of the balance vertical plate 4. After the adjustment is completed, tighten it immediately with the locking nut 2.

[0042] 2. Measure the size of the impeller center hole, select the balancing mandrel 5 of corresponding accuracy according to the measured size for assembly, and support the assembled balancing mandrel 5 on the knife-edge guide rail of the balancing vertical plate 4.

[0043] 3. The balancing mandrel 5 rolls on the knife-edge guide rail of the balancing vertical plate 4. After the rolling stops, record the deviation direction and position of the impeller's center of mass, take appropriate glue to replace the balancing mass and stick it to the appropriate position in the opposite direction of the impeller's center of mass. Repeat the test and adjust the amount of glue or the radial position repeatedly until the balancing mandrel 5 can remain stationary at any position of the knife-edge guide rail of the balancing vertical plate 4. Record the weight of the glue and the final position to determine the balancing mass.

[0044] 4. According to the actual state of the impeller and the design requirements, the static balance of the impeller can be ensured once by welding additional balancing mass at the opposite position of the impeller mark or by machining to remove the balancing mass at the center of mass position.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A universal detection device for static balance of a rotating body, characterized in that: The device comprises a balancing base (1), a pair of balancing vertical plates (4) being mounted on the balancing base (1), knife-edge-shaped guide rails (7) being arranged on the tops of the balancing vertical plates (4), and balancing core shafts (5) being rotatably arranged on the two knife-edge-shaped guide rails (7).

2. The universal detection device for static balance of a rotating body according to claim 1, characterized in that: The balancing mandrel (5) comprises more than one piece, and the diameters D of the matching circular surfaces (11) of the balancing mandrels (5) and the central hole of the rotating body that are gap-matched differ from each other by 0.002 to 0.005 mm.

3. The universal detection device for static balance of a rotating body according to claim 1, characterized in that: Stop pins (6) are provided at both ends of the knife-edge-shaped guide rail (7).

4. The universal detection device for static balance of a rotating body according to claim 1, characterized in that: The top of the balancing vertical plate (4) is connected to the knife-edge-shaped guide rail (7) via a transition step (8).

5. The universal detection device for static balance of a rotating body according to claim 1, characterized in that: A pair of bosses A (9) are provided on the upper surface of the balancing base (1); and the balancing vertical plate (4) is connected to the bosses A (9).

6. The universal detection device for static balance of a rotating body according to claim 1, characterized in that: A pair of bosses B (10) are provided on the lower surface of the balancing base (1).

7. The universal detection device for static balance of a rotating body according to claim 1, characterized in that: A leveling screw (3) is also installed on the balancing base (1).

8. The universal detection device for static balance of a rotating body according to claim 7, characterized in that: The leveling screw (3) is threadedly connected to the locking nut (2).

9. A detection method of a universal detection device for static balance of a rotating body according to any one of claims 1 to 8, characterized in that: The balancing base (1) is leveled; the size of the center hole of the rotating body (12) to be tested is measured, and a balancing mandrel (5) with corresponding accuracy is selected according to the measured size for assembly therewith; after assembly, the balancing mandrel (5) is placed on two knife-edge-shaped guide rails (7), the rotating body (12) is gently pushed repeatedly and then released, and the rolling condition of the balancing mandrel (5) is observed; when the balancing mandrel (5) moves a certain distance on the two knife-edge-shaped guide rails (7) and then stops, it is judged that the static balance of the rotating body (12) is qualified; when the balancing mandrel (5) swings back and forth on the two knife-edge-shaped guide rails (7), the static balance of the rotating body (12) is unqualified.

10. The detection method of the universal detection device for static balance of a rotating body according to claim 9, characterized in that: When the static balance of the rotating body (12) is unqualified, the center of mass of the rotating body (12) is located below the balancing core shaft (5). At this time, glue is taken and pasted on the position in the opposite direction of the center of mass of the rotating body (12), and the detection is continued until the static balance of the rotating body (12) is qualified; at this time, the glue is removed and the position is recorded to determine the balance quality.

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