Flywheel Static Balance Detection, Weight Removal Method and Flywheel Static Balance Detection Device

Abstract

The present invention discloses a method for detecting and removing weight from the static balance of a flywheel, as well as a device for detecting the static balance of a flywheel, which solves the problems of low efficiency and poor accuracy existing in the traditional detection of the static balance of a flywheel. In the device of the present invention, a centering chuck for fixing the flywheel is provided at the center of the top surface of the balance workbench. The center of the bottom surface of the balance workbench has a convex spherical surface, and the top surface of the cylinder block has a concave spherical surface that corresponds to and is in contact with the convex spherical surface. A medium input channel is opened on the cylinder block, and the medium input channel communicates with the gap between the convex spherical surface and the concave spherical surface. The present invention utilizes the cooperation between the convex spherical surface on the bottom surface of the balance workbench and the concave spherical surface on the top surface of the cylinder block. By introducing pressurized medium, the gravity of the balance workbench is overcome, enabling it to form a suspended state, and the levelness of the flywheel can be conveniently and effectively detected in cooperation with a level. The present invention has the advantages of simple structure, convenient operation, high detection efficiency, high accuracy, long service life, and low manufacturing cost.

Description

Technical Field

[0001] The present invention relates to a detection device and method, specifically a method for detecting and removing unbalance of a flywheel and a flywheel static balance detection device. Background Art

[0002] A flywheel is a disc-shaped part with a large moment of inertia, installed at the power output end, rotating at medium and high speeds following the main shaft, and its function is an energy storage device.

[0003] As is well known, for rotary parts, before installation and use, balance detection should be carried out on them. Otherwise, due to low balance stability performance, the rotating body is likely to cause significant impacts on the overall operation of the equipment due to unbalance after short-term operation.

[0004] For flywheels, they are generally manufactured by casting, belonging to cast iron parts. After manufacturing and forming, balance detection must be carried out. Currently, the commonly used static balance detection usually uses a balance bracket. A roller is placed on the bracket, and a mandrel passes through the central hole of the flywheel to keep the flywheel in a vertical state. After being locked with a tooling, it is placed on the roller, and detection and judgment are carried out at multiple angles to determine the unbalanced part of the flywheel. Then the flywheel is removed, the weight is removed, and then the installation and detection processes are repeated until it meets the requirements of the drawing. This detection method has the following problems: (1) Flywheels are often heavy. When measuring in a vertical state, high requirements are imposed on the rigidity of the bracket, the strength of the roller, as well as the overall manufacturing accuracy and installation accuracy. It is not easy to maintain, affects the service life of the equipment, and increases the cost; (2) There is no effective support in this detection state, and weight removal cannot be directly carried out. After each measurement, the flywheel must be removed to remove the weight, and then reinstalled. Repeated disassembly and measurement not only have low efficiency but also have large errors.

[0005] Therefore, it is necessary to design a flywheel static balance detection method with less influence from tooling factors, high measurement efficiency, and long service life for flywheel static balance detection. Summary of the Invention

[0006] The purpose of the present invention is to solve the above technical problems and provide a flywheel static balance detection device with a simple structure, convenient operation, high detection efficiency, high precision, long service life, and low manufacturing cost.

[0007] The present invention also provides a method for detecting and removing unbalance of a flywheel using the above detection device.

[0008] The flywheel static balance detection device of the present invention includes a cylinder block and a balance workbench placed on the cylinder block. A centering chuck for fixing the flywheel is provided at the center of the top surface of the balance workbench. A convex spherical surface is provided at the center of the bottom surface of the balance workbench, and a concave spherical surface corresponding to and in contact with the convex spherical surface is provided on the top surface of the cylinder block. A medium input channel is opened on the cylinder block, and the medium input channel communicates with the gap between the convex spherical surface and the concave spherical surface.

[0009] A medium collection groove is provided on the periphery of the concave spherical surface of the cylinder block, and the bottom surface of the medium collection groove communicates with a medium output channel.

[0010] A plurality of groups of buffer components are evenly provided on the periphery of the bottom surface of the balance workbench.

[0011] The buffer component includes a spring bracket fixed to the bottom surface of the balance workbench, and a spring is provided inside the spring bracket.

[0012] The periphery of the balance workbench is connected to a jacking device, and the jacking device can be a hydraulic or electric jacking device, such as a hydraulic cylinder, a motor-driven jacking mechanism, etc.

[0013] It further includes an annular sealing cover. The upper end of the annular sealing cover is fixed to the bottom surface of the balance workbench, and a sealing ring is provided between the lower end and the cylinder block.

[0014] The flywheel static balance detection and weight removal method of the present invention includes the following steps:

[0015] I) Hoist the flywheel in a horizontal state to the balance workbench of the flywheel static balance detection device, and fix the flywheel with the centering chuck to keep it in a horizontal state.

[0016] II) Pressurize and send the medium through the medium input channel to make the medium fill the gap between the convex spherical surface and the concave spherical surface, and overcome the gravity of the balance workbench under pressure, so that the convex spherical surface of the balance workbench floats on the concave spherical surface of the cylinder block.

[0017] III) After the balance workbench keeps floating stably, place a level on the surface of the flywheel to detect the levelness of the upper end surface of the flywheel to determine the unbalanced part of the flywheel.

[0018] IV) Add counterweights in the opposite direction of the unbalanced part of the flywheel. After the flywheel reaches balance, weigh the counterweights to obtain the unbalance amount.

[0019] It further includes

[0020] Step V): Depressurize the medium input channel to allow the balance workbench to fall under gravity, and the convex spherical surface of the balance workbench naturally fits with the concave spherical surface of the cylinder base; control the lifting device to jack up the balance workbench, and use a drill press to remove the weight from the unbalanced part of the flywheel. After the removal is completed, control the lifting device to return to its original position, lower the balance workbench, and make the convex spherical surface of the balance workbench naturally fit with the concave spherical surface of the cylinder base again. Repeat steps I) to V) until the process requirement value is reached.

[0021] Step IV) also includes an error verification process: Add counterweight blocks in the reverse direction of the unbalanced part of the flywheel. After the flywheel reaches balance, rotate the balance workbench in a suspended state for multi-angle determination to verify the unbalanced part and unbalanced amount of the flywheel multiple times.

[0022] The medium can be a liquid or gaseous medium, such as water, oil, gas, etc., and hydraulic oil is preferably used.

[0023] Aiming at the problems existing in the background technology, the present invention changes the detection state of the flywheel. The flywheel is fixed in a horizontal lying state by using a centering chuck. The convex spherical surface on the bottom surface of the balance workbench is matched with the concave spherical surface on the top surface of the cylinder base. By introducing a pressurized medium, the gravity of the balance workbench is overcome to form a suspended state. Under this condition, the levelness of the flywheel can be conveniently and effectively detected with the cooperation of a level. By adding counterweight blocks in the reverse direction of the unbalanced part of the flywheel, the unbalanced amount can also be quickly measured. The present invention enables: (1) The structure of the entire device is extremely simple. The lying state makes the flywheel more stable, with high detection accuracy. The detection process using the suspension principle has low requirements for the manufacturing and installation accuracy of the equipment, is easy to maintain, has a long service life, and low manufacturing cost; (2) With the cooperation of the lifting device, the balance workbench can be jacked up and effectively supported. Therefore, without disassembling the flywheel, the weight of the unbalanced part of the flywheel can be directly removed with a drill press, thus eliminating the process of repeatedly disassembling and assembling the flywheel. It is less affected by tooling, greatly improves the measurement efficiency, avoids the error problems caused by repeated disassembly and assembly, greatly improves the detection accuracy, and can effectively meet the requirements of multiple static balance detections and weight removal.

[0024] Further, considering that the balance workbench will shake during the initial pressure application, a plurality of buffer components are evenly arranged on the peripheral part of the bottom surface of the balance workbench to avoid collision caused by excessive shaking. Under the buffering effect, the balance workbench can quickly enter the suspended stable state.

[0025] The present invention has a simple structure, is easy to operate, has a long service life, is easy to maintain, and has accurate support; the method of the present invention has high operation efficiency, saves time and effort, and has high detection accuracy. It is applicable to the static balance detection of various rotating parts, especially suitable for flywheels that require multiple balance detections and weight removal operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the present invention.

[0027] Figure 2 This is a partially enlarged schematic diagram of the buffer component of the present invention.

[0028] Figure 3 This is a partially enlarged schematic diagram of the sealing component of the present invention.

[0029] Figure 4 This is a state diagram of the device of the present invention after pressure testing.

[0030] Figure 5 This is a state diagram of the device of the present invention after jacking up.

[0031] Wherein, 1 - centering chuck, 2 - balance workbench, 2-1 - convex spherical surface, 3 - spring, 4 - spring support, 5 - annular sealing cover, 6 - sealing ring, 7 - cylinder base, 7-1 - concave spherical surface, 7-2 - medium input channel, 7-3 - medium output channel, 7-4 - medium collection tank, 8 - buffer oil cylinder, 9 - gap, 10 - flywheel. Specific embodiments

[0032] The device of the present invention will be further explained below with reference to the accompanying drawings:

[0033] Refer to Figure 1 , the flywheel static balance detection device of the present invention includes a cylinder base 7 and a balance workbench 2 placed on the cylinder base 7. A centering chuck 1 for fixing the flywheel 10 is provided at the center of the top surface of the balance workbench 2. The center of the bottom surface of the balance workbench 2 has a convex spherical surface 2-1, and the top surface of the cylinder base 7 has a concave spherical surface 7-1 corresponding to and in contact with the convex spherical surface 2-1. A medium input channel 7-2 is opened on the cylinder base 7, and the medium input channel 7-1 communicates with the gap 9 between the convex spherical surface 2.1 and the concave spherical surface 7-1. The top surface of the circumferential part of the concave spherical surface 7-1 of the cylinder base 7 has a medium collection tank 7-4, and the bottom surface of the medium collection tank 7-4 communicates with the medium output channel 7-3. The pressurized medium flows into the gap 9 through the medium input channel 7-1, overcomes the gravity of the balance workbench 2 to make it suspended, and the medium overflowing from the gap 9 is collected through the medium collection tank 7-4 and then flows out and is recycled through the medium output channel 7-3.

[0034] Refer to Figure 2, a plurality of buffer components are evenly arranged on the circumferential part of the bottom surface of the balance workbench 2 (the part other than the convex spherical surface 2-1). Preferably, the buffer component includes a spring bracket 4 fixed on the bottom surface of the balance workbench 2. A spring 3 is arranged inside the spring bracket 4. When the balance workbench 2 shakes during the initial suspension period, the arrangement of the plurality of buffer components can effectively reduce the amplitude of the shake and avoid direct collision between the balance workbench 2 and the cylinder seat 7, damaging the integrity of the convex spherical surface 2-1 and the concave spherical surface 7-1 and affecting the measurement.

[0035] A jacking device is also connected to the circumferential part of the balance workbench 2 to synchronously jack up the balance workbench 2, which plays a supporting role when using a drilling machine to remove the weight of the flywheel, protects the spherical surfaces of the cylinder seat 7 and the balance workbench 2, and improves the service life. The jacking device can be a hydraulic or electric jacking device, such as a hydraulic cylinder, a jacking mechanism driven by a motor, etc. In this embodiment, a buffer cylinder 8 (a two-way hydraulic buffer cylinder) is adopted. The number of the jacking devices is set according to needs to preferably meet the requirements of synchronously and stably jacking up the balance workbench 2 and effectively supporting it.

[0036] See Figure 3 , an annular sealing cover 5 is further arranged between the balance workbench 2 and the cylinder seat 7. The upper end of the annular sealing cover 5 is fixed to the bottom surface of the balance workbench 2 by bolts, and a sealing ring 6 is arranged between the lower end and the cylinder seat 7 for sealing to avoid leakage of the pressure medium.

[0037] The flywheel static balance detection and weight removal method of the present invention includes the following steps:

[0038] I) Hoist the flywheel 10 in a horizontal state onto the balance workbench 2 of the flywheel static balance detection device, and fix the flywheel 10 with a centering chuck 1 to keep it in a horizontal state;

[0039] II) Pressurize and send hydraulic oil (the medium in this embodiment is hydraulic oil) through the medium input channel 7-2, so that the hydraulic oil fills the gap 9 between the convex spherical surface 2-1 and the concave spherical surface 7-1, and overcome the gravity of the balance workbench 2 under pressure, so that the convex spherical surface 2-1 of the balance workbench 2 floats on the concave spherical surface 7-1 of the cylinder seat 7, and the gap 9 increases; after the initial pressure application, the balance workbench 2 may shake, and at this time, the spring 3 can play a buffering role;

[0040] III) After the balance workbench 2 remains stably suspended, place a level (not shown in the figure) on the surface of the flywheel 10 to detect the levelness of the upper end surface of the flywheel, and determine the unbalanced part of the flywheel according to the direction indicated by the bubble (the direction indicated by the bubble is the lighter part);

[0041] IV) Add counterweight blocks to the reverse of the unbalanced part of the flywheel 10. After the flywheel 10 reaches balance, weigh the counterweight blocks to obtain the unbalance amount;

[0042] 5. Depressurize the medium input channel to let the balance workbench 2 fall by gravity. The convex spherical surface 2.1 of the balance workbench 2 naturally fits with the concave spherical surface 7-1 of the cylinder seat 7, and the gap 9 decreases. Control the buffer oil cylinder 8 to jack up and support the balance workbench 2, separating the convex spherical surface 2.1 from the concave spherical surface 7-1 of the cylinder seat 7, and the gap 9 increases. Use a drilling machine to remove the weight from the unbalanced part of the flywheel 10. After the removal is completed, control the buffer oil cylinder 8 to return to its original position and lower the balance workbench 2 to make the convex spherical surface 2-1 of the balance workbench 2 naturally fit with the concave spherical surface 7-1 of the cylinder seat 7 again. Repeat steps 1) to 3). If the spirit level still determines that the flywheel 10 has an unbalanced part, continue with steps 4) and 5). The above operations can be repeated multiple times until the process requirement value is reached.

[0043] When performing the said step 4), it also includes an error verification process: Add a counterweight to the reverse of the unbalanced part of the flywheel to make the flywheel 10 balanced. In the suspended state, the balance workbench 2 can be manually rotated multiple times, each time by a certain angle, and cooperate with the spirit level for multi-angle determination to verify the unbalanced part and unbalanced amount of the flywheel multiple times.

[0044] When in the shutdown state: The buffer oil cylinder 8 is pressurized to jack up the balance workbench 2, separating the contact surface between the balance workbench 2 and the cylinder seat 7, and the spring 3 is separated from the top surface of the cylinder seat 7 to protect the spherical surface where the cylinder seat 7 contacts the balance workbench 2 and improve the service life.

[0045] The repeated positioning of the detection using the device of the present invention is accurate, with high precision, and can efficiently complete the static balance detection task of the flywheel. At the same time, it is also applicable to the static balance of other rotary parts with a relatively small height.

Claims

1. A flywheel static balance detection device, comprising a cylinder block and a balance workbench placed on the cylinder block, characterized in that, A centering chuck for fixing the flywheel is provided at the center of the top surface of the balance workbench. A convex spherical surface is provided at the center of the bottom surface of the balance workbench. A concave spherical surface corresponding to and in contact with the convex spherical surface is provided on the top surface of the cylinder block. A medium input channel is formed in the cylinder block, and the medium input channel communicates with the gap between the convex spherical surface and the concave spherical surface. A plurality of groups of buffer components are evenly provided at the periphery of the bottom surface of the balance workbench. Each buffer component includes a spring bracket fixed to the bottom surface of the balance workbench, and a spring is provided inside the spring bracket. The periphery of the balance workbench is connected to a lifting device.

2. The flywheel static balance detection device according to claim 1, wherein, A medium collection groove is provided at the periphery of the concave spherical surface of the cylinder block, and the bottom surface of the medium collection groove communicates with a medium output channel.

3. The flywheel static balance detection device according to claim 1 or 2, characterized in that, It further includes an annular sealing cover. The upper end of the annular sealing cover is fixed to the bottom surface of the balance workbench, and a sealing ring is provided between the lower end and the cylinder block.

4. A method for flywheel static balance detection and weight removal, characterized in that, It includes the following steps: (1) Hoist the flywheel in a horizontal state onto the balance workbench of the flywheel static balance detection device according to any one of claims 1-3, and fix the flywheel with the centering chuck to keep it in a horizontal state. (2) Pressurize and send the medium through the medium input channel so that the medium fills the gap between the convex spherical surface and the concave spherical surface, and overcome the gravity of the balance workbench under pressure, so that the convex spherical surface of the balance workbench floats on the concave spherical surface of the cylinder block. (3) After the balance workbench remains floating and stable, place a spirit level on the surface of the flywheel to detect the levelness of the upper end surface of the flywheel to determine the unbalanced part of the flywheel. (4) Add counterweights in the opposite direction of the unbalanced part of the flywheel. After the flywheel reaches balance, weigh the counterweights to obtain the unbalance amount. (5) Depressurize the medium input channel to make the balance workbench fall under gravity, and the convex spherical surface of the balance workbench naturally fits with the concave spherical surface of the cylinder block. Control the lifting device to jack up the balance workbench, use a drill press to remove the weight of the unbalanced part of the flywheel. After the removal is completed, control the lifting device to return to its original position, lower the balance workbench, and make the convex spherical surface of the balance workbench naturally fit with the concave spherical surface of the cylinder block again. Repeat steps (1) to (5) until the process requirement value is reached.

5. The flywheel static balance detection and weight removal method according to claim 4, characterized in that, The step (4) further includes an error verification process: add counterweights in the opposite direction of the unbalanced part of the flywheel. After the flywheel reaches balance, rotate the balance workbench under the floating state for multi-angle determination to verify the unbalanced part and unbalance amount of the flywheel multiple times.

Images