Simple mechanical expansion shaft for testing unbalance amount of rotor core

Abstract

The utility model discloses a simple mechanical expansion shaft for testing the unbalance amount of a rotor core, which relates to the field of mechanical expansion shafts and comprises a sleeve, a sliding column is mounted in an inner cavity of the sleeve, a sliding block and a key groove are fixedly connected to the sliding column, a rectangular spring is mounted at the top of the sliding column, and a push rod is mounted at the bottom of the sliding column. A threaded rod is installed at the bottom of the push rod, square grooves are symmetrically formed in the periphery of the outer wall of the sleeve, the square grooves are matched with key grooves in size, the key grooves are inclined with smooth surfaces, the key grooves are installed in an inner cavity of one of the square grooves, a threaded groove is formed in the center of the bottom of the sleeve, five sliding grooves and five sliding blocks are formed in an inner cavity of the threaded groove, and the sliding blocks are arranged in the sliding grooves. The sliding block is matched with the sliding groove in size, the sleeve is arranged on the outer wall of the sliding column in a sleeving mode, and the sliding block is installed in an inner cavity of the sliding groove. The simple mechanical expansion shaft for testing the unbalance amount of the rotor iron core is simple in overall disassembly, wide in range of testing the rotor iron core, and capable of relating to various iron core ranges.

Description

Technical Field

[0001] The utility model relates to the field of mechanical expansion shafts, in particular to a simple mechanical expansion shaft for testing the unbalance amount of a rotor core. Background Art

[0002] Most of the movements in the equipment are rotational movements. People call the components that rotate around a fixed axis rotors. The main reasons for rotor imbalance are uneven mass of the rotor core or manufacturing and installation errors. If the rotor core has unbalanced weight, it will generate inertial centrifugal force or inertial moment after rotation, which will produce dynamic pressure on the bearings, thereby causing additional friction and additional internal stress in the bearings, causing increased bearing wear, reduced strength of parts, and shortened life; at the same time, it will also generate harmful vibrations, resulting in reduced working accuracy, reliability, mechanical efficiency and service life of the machinery, and may even cause mechanical damage due to resonance.

[0003] Imbalance is a fault state caused by the misalignment of mass and geometric centerline. The consequence of imbalance is the increase of additional load. It is one of the four most common faults of equipment and parts damage. It is manifested by the vibration value gradually increasing with the extension of running time. Sudden imbalance is caused by the falling off of parts on the rotor or the attachment and jam of foreign matter in the impeller flow channel. The vibration value of the unit suddenly increases significantly and then stabilizes at a certain level. Dynamic imbalance will generate centrifugal force. The centrifugal inertial force acts on the machine and its foundation through the bearing, causing vibration, noise, accelerated bearing wear, shortened mechanical life, and severe cases can cause destructive accidents. According to statistics, about 50% of mechanical vibrations are caused by unbalanced forces. Therefore, it is necessary to change the mass of the moving part of the rotating machinery and reduce the unbalanced force, that is, balance the rotor to achieve the allowable balancing accuracy level, or reduce the amplitude of the mechanical vibration generated thereby to within the allowable range. The rotor core is an important part of the entire rotor in order to ensure the imbalance of the rotor core.

[0004] Therefore, it is necessary to propose a simple mechanical expansion shaft to test the unbalance of the rotor core to solve the above problems. Utility Model Content

[0005] The main purpose of the utility model is to provide a simple mechanical expansion shaft for testing the unbalance of a rotor core, which can effectively solve the problems in the background technology.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A simple mechanical expansion shaft for testing the unbalance of a rotor core comprises a sleeve, a sliding column is installed in the inner cavity of the sleeve, a sliding block and a keyway are fixedly connected to the sliding column, a rectangular spring is installed on the top of the sliding column, a push rod is installed on the bottom of the sliding column, and a threaded rod is installed on the bottom of the push rod.

[0008] Preferably, square grooves are symmetrically provided around the outer wall of the sleeve, the sizes of the square grooves and the key grooves are matched, the key grooves are inclined with a smooth surface, and the key groove is installed in the inner cavity of one of the square grooves.

[0009] Preferably, a thread groove is opened in the center of the bottom of the sleeve, and a sliding groove is opened in the inner cavity of the thread groove. There are five sliding grooves and five sliding blocks. The sizes of the sliding blocks and the sliding grooves are matched. The sleeve is sleeved on the outer wall of the sliding column, and the sliding block is installed in the inner cavity of the sliding groove.

[0010] Preferably, a positioning rod is fixedly connected to the center of the top of the sliding column, the positioning rod is movably connected to the top of the sleeve inner cavity, the rectangular spring is wound around the outer wall of the positioning rod, and the top of the rectangular spring is fitted to the top of the sleeve inner cavity.

[0011] Preferably, a turning handle is fixedly connected to the bottom of the threaded rod, the turning handle is located at the bottom of the sleeve, the threaded rod is threadedly connected to the bottom of the inner cavity of the sleeve through a thread groove, and the top of the push rod is fitted to the bottom of the sliding column.

[0012] Preferably, the rectangular spring comprises spring coils and coils, with gaps being left between the spring coils and coils. Beneficial Effects

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The simple mechanical expansion shaft for testing the unbalance of the rotor core is easy to disassemble as a whole and can test a wide range of rotor cores, covering a variety of core ranges.

[0015] 2. The simple mechanical expansion shaft for testing the imbalance of the rotor core can drive the threaded rod to rotate by rotating the set handle. At this time, it can be threadedly connected to the sleeve through the threaded groove, so as to drive the push rod to move, which can be used to push the sliding column to move. This structure is manually rotated, and the controllability can be guaranteed. The sleeve is set, and the threaded groove and the slide groove are driven inside to facilitate the installation of the sliding column and the keyway. At the same time, the position of the keyway can be limited by the opened slide groove, so as to prevent the slide groove from rotating inside the sleeve when the push rod is pushed, thereby avoiding the extension of the keyway.

[0016] 3. The simple mechanical expansion shaft for testing the unbalance of the rotor core has a keyway set up to tighten the inside of the rotor core through threads so that the inside of the core is in full contact with the keyway without shaking. The bottom of the keyway has a smooth bevel surface to facilitate movement with the slider. A rectangular spring is set up with a certain gap between the spring coils. When subjected to external loads, the spring will shrink and deform. It has stable stiffness, simple structure, easy manufacturing, and wide application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the front side of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the inner cavity of the sleeve of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the sliding column of the utility model.

[0020] In the figure: 1, sleeve; 2, square groove; 3, turning handle; 4, sliding groove; 5, threaded groove; 6, threaded rod; 7, push rod; 8, sliding column; 9, slider; 10, keyway; 11, positioning rod; 12, rectangular spring. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] like Figure 1-Figure 3 As shown, a simple mechanical expansion shaft for testing the unbalance of a rotor core comprises a sleeve 1, a sliding post 8 is installed in the inner cavity of the sleeve 1, a slider 9 and a keyway 10 are fixedly connected to the sliding post 8, a rectangular spring 12 is installed on the top of the sliding post 8, a push rod 7 is installed at the bottom of the sliding post 8, a threaded rod 6 is installed at the bottom of the push rod 7, square grooves 2 are symmetrically opened around the outer wall of the sleeve 1, the sizes of the square grooves 2 and the keyway 10 are adapted, the keyway 10 is in an inclined shape with a smooth surface, the keyway 10 is installed in the inner cavity of one of the square grooves 2, a threaded groove 5 is opened in the middle of the bottom of the sleeve 1, a slide groove 4 is opened in the inner cavity of the threaded groove 5, there are five slide grooves 4, and there are five slide grooves 4 and the slider 9 has five The sizes of the slider 9 and the slide groove 4 are adapted, the sleeve 1 is sleeved on the outer wall of the slide column 8, the slider 9 is installed in the inner cavity of the slide groove 4, the center of the top of the slide column 8 is fixedly connected with a positioning rod 11, the positioning rod 11 is movably connected to the top of the inner cavity of the sleeve 1, the rectangular spring 12 is wound on the outer wall of the positioning rod 11, the top of the rectangular spring 12 fits against the top of the inner cavity of the sleeve 1, the bottom of the threaded rod 6 is fixedly connected with a turning handle 3, the turning handle 3 is located at the bottom of the sleeve 1, the threaded rod 6 is threadedly connected to the bottom of the inner cavity of the sleeve 1 through the threaded groove 5, the top of the push rod 7 fits against the bottom of the slide column 8, the rectangular spring 12 includes spring coils and coils, and there is a gap between the spring coils and coils.

[0023] The overall disassembly is simple, and the range of testing rotor cores is wide, which can involve a variety of core ranges. By rotating the set handle 3, the threaded rod 6 can be driven to rotate. At this time, the threaded groove 5 can be threadedly connected with the sleeve 1, so that the push rod 7 can be driven to move, which can be used to push the slide post 8 to move. Moreover, this structure is manually rotated, and the controllability can be guaranteed. Through the set sleeve 1, the threaded groove 5 and the slide groove 4 are driven inside, which is convenient for the installation of the slide post 8 and the key groove 10. At the same time, the position of the key groove 10 can be adjusted through the opened slide groove 4. The limit position is set to prevent the slide groove 4 from rotating inside the sleeve 1 when the push rod 7 is pushed, thereby avoiding the extension of the key groove 10. The key groove 10 is used to tighten the inside of the rotor core through threads to allow the inside of the core to fully contact the key groove 10 without shaking. The bottom of the key groove 10 is a smooth bevel to facilitate the movement with the slider 9. The rectangular spring 12 is set, and there is a certain gap between the spring coils. When subjected to external loads, the spring will shrink and deform. It has stable stiffness, simple structure, easy manufacturing, and wide application.

[0024] It should be noted that the utility model is a simple mechanical expansion shaft for testing the imbalance of the rotor core. When in use, the rotor core is placed outside the sleeve 1, the handle 3 is rotated, and the threaded rod 6 is driven to be threadedly connected with the sleeve 1 through the threaded groove 5, thereby driving the push rod 7 forward, thereby driving the sliding column 8 forward. When the sliding column 8 moves, it will drive the keyway 10 to be pushed outward. At this time, the inside of the rotor core will fully contact the keyway 10, and the front of the keyway 10 will gradually compress the rectangular spring 12, so that the rectangular spring 12 will be squeezed and deformed, and the push back amount of the rectangular spring 12 is offset by the advancement amount of the threaded groove 5 and the threaded rod 6, so that the push rod 7 remains stationary.

[0025] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A simple mechanical expansion shaft for testing the unbalance of a rotor core, comprising a sleeve (1), characterized in that: A sliding column (8) is installed in the inner cavity of the sleeve (1), a slider (9) and a keyway (10) are fixedly connected to the sliding column (8), a rectangular spring (12) is installed on the top of the sliding column (8), a push rod (7) is installed on the bottom of the sliding column (8), and a threaded rod (6) is installed on the bottom of the push rod (7).

2. A simple mechanical expansion shaft for testing the unbalance of a rotor core according to claim 1, characterized in that: The outer wall of the sleeve (1) is symmetrically provided with square grooves (2), the sizes of the square grooves (2) and the key grooves (10) being matched, the key grooves (10) being inclined with a smooth surface, and the key groove (10) being installed in the inner cavity of one of the square grooves (2).

3. The simple mechanical expansion shaft for testing the unbalance of a rotor core according to claim 1, characterized in that: A thread groove (5) is provided in the middle of the bottom of the sleeve (1), and a slide groove (4) is provided in the inner cavity of the thread groove (5). There are five slide grooves (4) and five sliders (9). The sizes of the sliders (9) and the slide grooves (4) are matched. The sleeve (1) is sleeved on the outer wall of the slide column (8), and the sliders (9) are installed in the inner cavity of the slide grooves (4).

4. The simple mechanical expansion shaft for testing the unbalance of a rotor core according to claim 1, characterized in that: A positioning rod (11) is fixedly connected in the middle of the top of the sliding column (8), and the positioning rod (11) is movably connected to the top of the inner cavity of the sleeve (1). The rectangular spring (12) is wound around the outer wall of the positioning rod (11), and the top of the rectangular spring (12) is fitted to the top of the inner cavity of the sleeve (1).

5. The simple mechanical expansion shaft for testing the unbalance of a rotor core according to claim 1, characterized in that: The bottom of the threaded rod (6) is fixedly connected to a rotating handle (3), the rotating handle (3) is located at the bottom of the sleeve (1), the threaded rod (6) is threadedly connected to the bottom of the inner cavity of the sleeve (1) through a thread groove (5), and the top of the push rod (7) is attached to the bottom of the sliding column (8).

6. The simple mechanical expansion shaft for testing the unbalance of a rotor core according to claim 1, characterized in that: The rectangular spring (12) comprises a spring coil and a coil, with a gap being left between the spring coils.

Images