CN219511744U - Balance type static balancing device of large rotor - Google Patents

Abstract

The utility model discloses a balance type static balancing device for a large rotor, and belongs to the technical field of electromechanical integrated detection. Comprises a connecting shaft, a balance plate and a level meter. The connecting shaft is inserted into the central hole of the rotor to be detected and is concentrically arranged with the rotor to be detected; a groove with a cross section similar to a V shape is arranged at the bottom of the connecting shaft; the balance plate is horizontally arranged at the bottom of the connecting shaft; the upper surface of the groove is provided with a convex edge matched with the groove, the top of the convex edge forms a knife edge with a horizontally extending arc-shaped vertex angle, and the knife edge is in arc contact with the groove; the level gauge is placed at the center position of the connecting shaft and/or the rotor to be detected, and the placement direction of the level gauge is perpendicular to the placement direction of the convex rib. The tool disclosed by the utility model has the advantages of simple structure, high strength, safety, reliability, convenience in manufacturing, low cost, no need of paster, no need of calculation, strong universality and low requirement on personnel, and can complete the whole static balance experiment.

Description

Balance type static balancing device of large rotor

Technical Field

The utility model belongs to the technical field of electromechanical integrated detection, and particularly relates to a balance type static balancing device for a large rotor.

Background

The rotor belongs to a large-scale high-speed rotating part, the mass center of the rotor is difficult to be guaranteed to be exactly on the rotating shaft line in the processing and manufacturing process of the rotor, a static balance process is required to be carried out according to relevant standard regulation, the purpose of the static balance process is to find out the size and the position of unbalance amount of the rotor, and the unbalance amount is reduced or eliminated by adding or removing a mass block, so that the unbalance amount in the manufacturing process is eliminated or reduced to be within relevant standard regulation, the product quality is guaranteed, and safe and stable operation is ensured.

As described in the chinese patent application CN200810045371.6, "steel ball-mirror plate type static balancing device and balancing method for hydroelectric generating set runner," the traditional hydraulic turbine runner static balancing process mainly adopts "steel ball-mirror plate type" static balancing device and method, and the greatest disadvantage of the device and method is that the structure is complex and the universality is poor. In addition, for the large-scale unit rotating wheel, because the steel ball and the mirror plate are in a point contact mode, the overload rotating wheel dead weight causes deformation of the bearing steel ball and the mirror plate, and the unbalance measurement and balancing are directly influenced, so the traditional device and method have great limitations, and the defects are as follows: (1) The mechanical structure is complex, the manufacturing and processing period is long, the cost is high, and the universality for various rotating wheels is poor; (2) inconvenient installation and operation and complex calculation method; (3) The device is only suitable for rotating wheels with smaller tonnage and has larger limitation; and (4) the static balance experiment period is longer.

The balance type static balancing device of the Chinese patent application No. CN201210500872.5 and the static balancing process of the rotating wheel of the water turbine, wherein the transition disc, the balance knife edge disc and the base are sequentially arranged from top to bottom, the transition disc and the balance knife edge disc are concentrically arranged and are hinged through a vertical rotating shaft, a rib is arranged on the lower surface of the balance knife edge disc, a ridge line is arranged at the bottom end of the rib, the rib is contacted with the base through the ridge line, and a pressure sensor is respectively arranged at two sides of the rib. Hydroturbine runner static balancing processes also exist such as. (1) The mechanical structure has oversized size, high manufacturing requirement, long processing period, high cost and poor universality; (2) The calculation method is complex, and the subsequent operation can be performed after the calculation result is waited for each time; (3) The requirements on operators are high, and the operators can be qualified only by professional static balance staff; (4) The static balancing process is more tedious, each balancing will affect the balance of other balancing parts, and needs to be repeated many times.

Disclosure of Invention

In order to overcome the technical defects, the utility model provides a balance type static balancing device of a large rotor, which aims to solve the problems related to the background technology.

The utility model provides a balance type static balancing device of a large rotor, which comprises:

the connecting shaft is inserted into the central hole of the rotor to be detected and is concentrically arranged with the rotor to be detected; a groove with a cross section similar to a V shape is arranged at the bottom of the connecting shaft;

the balance plate is horizontally arranged at the bottom of the connecting shaft; the upper surface of the groove is provided with a convex edge matched with the groove, the top of the convex edge forms a knife edge with a horizontally extending arc-shaped vertex angle, and the knife edge is in arc contact with the groove;

the level gauge is placed at the center position of the connecting shaft and/or the rotor to be detected, and the placing direction of the level gauge is perpendicular to the placing direction of the convex rib.

Preferably or alternatively, the rib apex angle is greater than the groove apex angle.

Preferably or optionally, a plurality of anti-toppling blocks are uniformly distributed in the circumferential direction of the balance plate, and the anti-toppling blocks are located right below the outer diameter of the rotor to be detected.

Preferably or alternatively, the balance plate is fixed at the center of the support base and is locked by using a bolt.

Preferably or alternatively, the connecting shaft is connected with the rotor to be detected through an end face bearing.

Preferably or alternatively, pin holes are arranged on the connecting shaft at positions exposed out of the rotor to be detected, and the connecting shaft is suitable for plugging safety pins.

Preferably or optionally, at least 8 weight positions are uniformly and symmetrically distributed on the outer diameter of the rotor to be detected and are suitable for installing the balancing weights.

Preferably or optionally, a hanging ring is further arranged on the top of the connecting shaft.

The utility model also provides a static balance method of the large rotor, which comprises the following steps:

step 1, assembling the balance type static balancing device, wherein the rotor to be detected is in an unbalanced state at the moment, and supporting the rotor to be detected by means of an anti-toppling block;

step 2, rotating the rotor to be detected until the connecting line of a certain weight position and an opposite weight position is perpendicular to the direction of the knife edge, placing the level meter at the center position of the rotor, and increasing and decreasing the balancing weight at the two positions of the weight position and the opposite weight position until the indication of the level meter is 0 degrees;

step 3, placing a balancing weight with preset weight on a balancing weight position perpendicular to the placing direction of the knife edge, recording the indication difference value of the level meter before and after the placing, calculating the balancing weight amount of the rotor to be detected under the unit angle offset based on the weight of the balancing weight and the change of the level meter, and finally taking off the additional balancing weight;

step 4, rotating the rotor to be detected for 30-45 degrees until the next weight position, wherein the connecting line of the weight position and the opposite weight position is perpendicular to the direction of the knife edge, increasing and decreasing the balancing weight at the two positions of the weight position or the opposite weight position according to the current indication number of the level meter and the weight amount of the rotor to be detected under the unit angle deflection, and returning the indication number of the level meter to zero,

step 5, repeating the step 4 until the indication of the level in all directions is zero;

step 6, rotating the rotor to be detected again until the connecting line of the counter weight position and the opposite counter weight position in the step 2 is perpendicular to the knife edge direction, and increasing and decreasing the counter weight at the two positions of the counter weight position and the opposite counter weight position until the indication of the level gauge is 0 degrees;

step 7, rotating the rotor to be detected for 30-45 degrees until reaching the next weight position, wherein the connecting line of the weight position and the opposite weight position is perpendicular to the direction of the knife edge, increasing and decreasing the balancing weight at the two positions of the weight position or the opposite weight position, returning to zero when the indication of the level gauge is zero,

step 8, repeating the step 7 until the indication of the level in all directions is zero;

and 9, fixing the weight plates at each weight position by using bolts and nuts, and ending the rotor static balance experiment.

Preferably or alternatively, the balancing weight comprises 4 different gauges; wherein the thickness of the first balancing weight is h, and the weight of a single block is M; the thickness of the second balancing weight is 2h, and the weight of a single block is 2M; the thickness of the third balancing weight is 3h, and the single weight is 3M; the thickness of the fourth balancing weight is 4h, and the single weight is 4M; h is 2-10 mm; m is less than or equal to the allowable unbalance amount.

The utility model relates to a balance type static balancing device of a large rotor, which has the following beneficial effects compared with the prior art:

1. the tool has the advantages of simple structure, high strength, safety, reliability, convenient manufacture and low cost.

2. Can be operated by common equipment in factories, does not need to be pasted, does not need to be calculated, and has strong universality. The requirements on personnel are low, only common fitters who can read and understand the indication of the level meter are needed, and the whole static balance experiment can be completed by 4-5 persons.

3. The result is visual, can balance weight, observe simultaneously, and experimental efficiency is high, only needs 3 hours to accomplish 1 experiment.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic cross-sectional view of the present utility model.

Fig. 3 is a schematic structural view of a rotor to be inspected in the present utility model.

Fig. 4 is a schematic structural view of the connecting shaft in the present utility model.

Fig. 5 is a schematic structural view of the balance plate in the present utility model.

The reference numerals are: 1. a hanging ring; 2. a safety pin; 3. a level gauge; 4. an end face bearing; 5. a connecting shaft; 6. a balance plate; 7. a bolt; 8. a support base; 9. anti-toppling blocks; 10. a rotor to be detected; 11. and (5) weighting the weight.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that the utility model may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the utility model.

Referring to fig. 1 to 5, a balance type static balancing device for a large rotor includes: the anti-toppling wooden block comprises a lifting ring 1, a safety pin 2, a level gauge 3, an end face bearing 4, a connecting shaft 5, a balance plate 6, bolts 7, a supporting base 8 and an anti-toppling wooden block.

The connecting shaft 5 is inserted into a central hole of the rotor 10 to be detected, and the connecting shaft 5 is connected with the rotor 10 to be detected through the end face bearing 4 and is concentrically arranged with the rotor 10 to be detected; a groove with a cross section approximately in a V shape is arranged at the bottom of the connecting shaft 5; the balance plate 6 is horizontally arranged at the bottom of the connecting shaft 5; the upper surface of the groove is provided with a convex edge matched with the groove, the top of the convex edge forms a knife edge with a horizontally extending arc-shaped vertex angle, and the knife edge is in arc contact with the groove; the balance plate 6 is fixed at the center of the support base 8 and is locked by using a bolt 7; the level meter 3 is placed at the center position of the connecting shaft 5 and/or the rotor 10 to be detected, the placement direction of the level meter 3 is perpendicular to the placement direction of the convex edges, a pointer of a balance is formed, the balancing weight is increased or decreased at two sides of the rotor 10 to be detected to achieve gravity center balance, and the static balance experiment is completed after the multiple angles are leveled.

In a further embodiment, the rib apex angle is greater than the groove apex angle. The connecting shaft 5 is conveniently arranged on the balance plate 6, so that the connecting shaft 5 is prevented from being clamped, and the completion of a later static balance experiment is prevented from being influenced. The contact surface of the convex rib and the groove is an arc, the radian of the arc is 15-60 degrees, if the radian is too large, the convex rib and the groove are in approximate line contact, but the whole leveling difficulty is greatly improved; if the radian is too large, on one hand, the contact surface between the groove and the convex rib is too large, and the leveling precision is affected.

In a further embodiment, a plurality of anti-toppling blocks 9 are uniformly distributed in the circumferential direction of the balance plate 6, and the anti-toppling blocks 9 are located right below the outer diameter of the rotor 10 to be detected. The rotor 10 to be detected is supported during leveling, and the rotor 10 to be detected is prevented from toppling over.

In a further embodiment, a pin hole is arranged on the connecting shaft 5 at a position exposed out of the rotor 10 to be detected, and is suitable for plugging the safety pin 2. The connecting shaft 5 is prevented from falling out in the processes of hoisting, assembling and leveling, so that potential safety hazards are formed. In addition, the top of the connecting shaft 5 is also provided with a hanging ring 1, so that the whole static balancing device is convenient to hoist.

In a further embodiment, at least 8 weight positions 11 are uniformly and symmetrically distributed on the outer diameter of the rotor 10 to be detected, and the corresponding radian between two adjacent weights is 45 degrees, so that the rotor is suitable for installing the balancing weights. Of course, for those skilled in the art, in order to improve the leveling precision, the number of the weights may be 10 and 12, and the radian between two adjacent weights is 36 ° and 30 °, so that the leveling precision of the whole rotor 10 to be detected is ensured.

In order to facilitate understanding of the technical solution of the present embodiment, the present embodiment further provides a static balancing method for a large rotor, which includes the following steps:

step 1, assembling the balance type static balancing device, wherein the rotor 10 to be detected is in an unbalanced state, and supporting the rotor 10 to be detected by means of the anti-toppling block 9;

step 2, rotating the rotor 10 to be detected until the connecting line of a certain weight 11 and an opposite weight 11 is perpendicular to the direction of the knife edge, placing the level 3 at the center of the rotor, and increasing and decreasing balancing weights at the two positions of the weight 11 and the opposite weight 11 until the indication of the level 3 is 0 degrees;

step 3, placing a balancing weight with preset weight on a balancing weight position 11 perpendicular to the placing direction of the knife edge, recording the indication difference value of the level meter 3 before and after the placing, calculating the balancing weight amount of the rotor 10 to be detected under unit angle offset based on the weight of the balancing weight and the change of the level meter 3, and finally taking off the additional balancing weight;

step 4, rotating the rotor 1030-45 degrees to be detected until the next weight 11, wherein the connecting line of the weight 11 and the opposite weight 11 is perpendicular to the knife edge direction, increasing and decreasing the balancing weight at the two positions of the weight 11 or the opposite weight 11 according to the current indication of the level 3 and the weight of the rotor 10 to be detected under the unit angle offset, and when the indication of the level 3 is zeroed,

step 5, repeating the step 4 until the indication of the level 3 in all directions is zeroed;

step 6, rotating the rotor 10 to be detected again until the connecting line of the counter weight 11 and the counter weight 11 in the step 2 is perpendicular to the knife edge direction, and increasing and decreasing the counter weights at the two positions of the counter weight 11 and the counter weight 11 until the indication of the level gauge 3 is 0 degrees;

step 7, rotating the rotor 1030-45 degrees to be detected until reaching the next weight position 11, wherein the connecting line of the weight position 11 and the opposite weight position 11 is perpendicular to the knife edge direction, increasing and decreasing the balancing weight at the two positions of the weight position 11 or the opposite weight position 11, returning to zero when the indication of the level gauge 3 is zero,

step 8, repeating the step 7 until the indication of the level 3 in all directions is zeroed;

and 9, fixing the weight plates on each weight position 11 by using bolts 7 and nuts, and ending the rotor static balance experiment.

Wherein the balancing weight comprises 4 different specifications; wherein the thickness of the first balancing weight is h, and the weight of a single block is M; the thickness of the second balancing weight is 2h, and the weight of a single block is 2M; the thickness of the third balancing weight is 3h, and the single weight is 3M; the thickness of the fourth balancing weight is 4h, and the single weight is 4M; h is 2-10 mm; m is less than or equal to the allowable unbalance amount.

In order to facilitate understanding of the technical solution of the balance type static balancing device of the large rotor, the solution will be further described with reference to specific engineering embodiments.

Step 1, manufacturing balancing weights, namely manufacturing a plurality of balancing weights with 4 specifications according to the positions of the balancing weight holes at the bottom of a rotor, wherein the specifications are as follows in mass: weight block 1, thickness 5mm, single block weight 1.43kg, weight block 2, thickness 10mm, single block weight 2.86kg; a balancing weight 3, the thickness is 15mm, and the single block weight is 4.3kg; weight 4, thickness 20mm, monolithic weight 5.73kg.

Step 2, numbering, referring to fig. 3, marking a rotor 10 to be detected, wherein 8 weight positions 11 are arranged in total;

step 3, assembling; as shown in fig. 2, anti-toppling blocks 9 are uniformly distributed on the assembly platform and are positioned right below the outer diameter of the rotor; placing a supporting base 8 on an assembly platform and locating at the center under the outer diameter of the rotor; the balance plate 6 is fixed at the center of the piece supporting base 8 and is locked by using the bolt 7; the end face bearing 4 is arranged at the bottom of the step at the upper side of the connecting shaft 5; the connecting shaft 5 is arranged in the central hole of the rotor, the safety pin 2 is arranged in the pin hole, and the connecting shaft 5 is prevented from falling out; the assembled assembly is lifted and placed on the knife edge of the balancing plate 6, and the rotor is in an unbalanced state and depends on the support of the rotor.

Step 4, rotating the two points of the serial number 1 and the serial number 5 to be perpendicular to the straight line direction of the knife edge;

step 5; the balancing weights are increased and decreased at the positions of the number 1 and the number 5, the level 3 of the piece 3 is placed at the center of the rotor according to the position of the attached drawing 2, and the number 1 can be regarded as the number 1 when the indication number of the level 3 is 0 degrees, and the two positions of the number 5 are balanced in the gravity center.

And 6, picking up 1 counter weight with the thickness of 10mm, placing the counter weight with the thickness of 10mm at a counter weight position 11 of a serial number 1, observing the indication change of the level meter 3, recording the indication change number of the level meter 3, and obtaining the weight of the counter weight required by the level meter 3 for every 1 degree change according to the absolute value of the weight of the 10mm counter weight plate being 2.86 kg/angle change. If the level 3 is shown as 1 deg., this indicates that a weight of 2.86kg is required in the opposite direction.

And 7, taking out the 1 additional 10mm balancing weight in the step 6, and re-observing whether the change of the level meter 3 is zero, wherein if the change is zero, the balancing of the number 1 and the number 5 is qualified and effective.

Step 8, rotating the rotor, and rotating the number 3 and the number 7 to be perpendicular to the straight line direction of the knife edge; and in the sequence number 3, the counter weights are increased and decreased at two points of the sequence number 7 until the indication number of the level meter 3 is 0.

Step 9, rotating the rotor, and rotating the number 2 and the number 6 to be perpendicular to the straight line direction of the knife edge; and in the sequence number 2, the counter weights are increased and decreased at two points of the sequence number 6 until the indication number of the level meter 3 is 0.

Step 10, rotating a rotor, and rotating two points of the serial number 4 and the serial number 8 to be perpendicular to the straight line direction of the knife edge; and in the sequence number 4, the counter weights are increased and decreased at two points of the sequence number 8 until the indication number of the level meter 3 is 0.

Step 12, rotating the rotor, and rotating the number 1 and the number 5 to be perpendicular to the straight line direction of the knife edge again; and in the sequence number 1, the counter weights are increased and decreased at two points of the sequence number 5 until the indication number of the level meter 3 is 0.

And 13, repeatedly balancing the three groups of weight positions 11 of the number 3, the number 7, the number 4, the number 8, the number 2 and the number 6 according to the step 12 until the level 3 at all points is 0, and fixing the weight plates by using bolts 7 and nuts (note: the weight of the bolts 7 and nuts is also considered in the weight range of the static balance experiment), so that the rotor static balance experiment is finished.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the utility model are not described in detail in order to avoid unnecessary repetition.

Claims (9)

1. A balance type static balancing device for a large rotor, comprising:

the connecting shaft (5) is inserted into the central hole of the rotor (10) to be detected and is concentrically arranged with the rotor (10) to be detected; a groove with a cross section approximately in a V shape is arranged at the bottom of the connecting shaft (5);

the balance plate (6) is horizontally arranged at the bottom of the connecting shaft (5); the upper surface of the groove is provided with a convex edge matched with the groove, the top of the convex edge forms a knife edge with a horizontally extending arc-shaped vertex angle, and the knife edge is in arc contact with the groove;

the level gauge (3) is placed at the center position of the connecting shaft (5) and/or the rotor (10) to be detected, and the placement direction of the level gauge (3) is perpendicular to the placement direction of the convex rib.

2. The large rotor balance static balancing device of claim 1 wherein the rib apex angle is greater than the groove apex angle.

3. The balance type static balancing device of the large rotor according to claim 1, wherein a plurality of anti-toppling blocks (9) are uniformly distributed in the circumferential direction of the balancing plate (6), and the anti-toppling blocks (9) are located right below the outer diameter of the rotor (10) to be detected.

4. The balance type static balancing device of a large rotor according to claim 1, characterized in that the balancing plate (6) is fixed at the center of the supporting base (8) and is locked by using bolts (7).

5. The balance type static balancing device of a large rotor according to claim 1, characterized in that the connecting shaft (5) is connected with the rotor (10) to be detected through an end face bearing (4).

6. The balance type static balancing device of the large rotor according to claim 1, wherein a pin hole is arranged on the connecting shaft (5) at a position exposed out of the rotor (10) to be detected, and is suitable for being inserted with a safety pin (2).

7. The balance type static balancing device of the large rotor according to claim 1, wherein at least 8 balancing weights (11) are uniformly and symmetrically distributed on the outer diameter of the rotor (10) to be detected and are suitable for being installed with balancing weights.

8. The large rotor balance static balancing device of claim 7, wherein the balancing weights comprise 4 different gauges; wherein the thickness of the first balancing weight is h, and the weight of a single block is M; the thickness of the second balancing weight is 2h, and the weight of a single block is 2M; the thickness of the third balancing weight is 3h, and the single weight is 3M; the thickness of the fourth balancing weight is 4h, and the single weight is 4M; h is 2-10 mm; m is less than or equal to the allowable unbalance amount.

9. The balance type static balancing device of the large rotor according to claim 1, wherein a hanging ring (1) is further arranged at the top of the connecting shaft (5).