A single-power multi-layer rotor core centering device

Abstract

The present invention relates to a single-power multi-layer rotor core centering device, comprising a spindle base, a mandrel pull rod installed in the spindle base, an expansion block installed on the spindle base, a first disc spring, an inclined wedge mechanism for driving the expansion block to extend and retract, and an existing power mechanism, the mandrel pull rod is connected to the power mechanism, the inclined wedge mechanism is floatingly connected to the mandrel pull rod through the first disc spring, and the first disc spring compensates for the aperture tolerance in the rotor core laminations when the expansion block is expanded, thereby realizing high-precision expansion of the rotor core. Compared with the prior art, the present invention has the advantages of high expansion precision, simple structure, safety and reliability, high temperature resistance, and strong applicability.

Description

Technical Field

[0001] The invention relates to the technical field of rotor core centering, in particular to a single-power multi-layer rotor core centering device. Background Art

[0002] The variable diameter centering device, also known as the expansion shaft, is widely used in occasions where inner diameter positioning is required in the mechanical and electronic industries. The variable diameter centering device is divided into two categories: mechanical and pneumatic. Among them, the most widely used is the pneumatic variable diameter centering device, which is mainly used in the unwinding and rewinding shaft. The surface protrudes after high-pressure ventilation, and the surface part retracts quickly after deflation, which can meet the needs of general equipment. However, the pneumatic variable diameter centering device has the problem of using compressed air alone. If the other parts of the equipment do not require pneumatic use, the pneumatic variable diameter centering device must be set up with a separate air source. The service life is short and the expansion centering accuracy is low. Another mechanical variable diameter centering device consists of a hand wheel, a double helical screw, left and right conical blocks, an expansion shoe, and a push rod. Rotating the hand wheel drives the double helical screw to rotate, driving the conical block on it to move toward or in the opposite direction, and the conical block drives the push rod to move up and down to achieve the variable diameter. This method relies on the rotation of the thread to drive the expansion shoe to extend. Because the pressure angle requirement is small and the number of expansion blocks is large, the bevel angle requirement of the cone block is high, and the processing quality is not easy to guarantee. The cost is high and manual intervention is required, which is extremely inconvenient.

[0003] The above two types of devices are designed without considering the hole diameter tolerance in the rotor core laminations, resulting in low expansion accuracy and the device is prone to failure.

[0004] After searching, the Chinese patent publication number CN208593918U discloses a mechanical expansion shaft with a slider structure, including a mandrel, a chuck body, a locking nut, a bearing, an arc support plate, a trapezoidal block, and a conical block. The mandrel is a straight shaft with an external thread in the middle thick section, and a conical block with a square bottom and four cross-sections is sleeved in the middle of the mandrel. The conical block is provided with a threaded hole matching the external thread. A coupling, a bearing, a locking nut, a chuck body, a locking nut, and a bearing are installed in sequence from the left end of the mandrel to the right. The coupling is sleeved on the top of the mandrel thin shaft, and the coupling is a threaded hole with an inner hole. The gear-shaped structure has an inner hole diameter that matches the diameter of the mandrel thin shaft. The bearings are symmetrically mounted on both ends of the mandrel thin shaft. The bearings are cylindrical structures with inner holes. The diameter of the inner hole of the bearings matches the diameter of the non-threaded section of the mandrel. The locking nut is a cylindrical structure with an inner threaded hole. The locking nut is connected to the outer thread through a thread. The chuck body is symmetrically mounted on the outer thread of the mandrel thick shaft. The chuck body is a cylindrical structure with a square inner hole. There are four square grooves distributed at 90° on the circumference of the cylindrical surface of the chuck body. The square grooves are equipped with matching trapezoidal blocks. The trapezoidal blocks are connected to arc-shaped support plates through screws. The positioning length of this structure is very limited, and multiple cores cannot be stacked. It is not suitable for occasions that require frequent expansion and release. In addition, the expansion shaft in the patent does not consider the problem of aperture tolerance in the core laminations. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a single-power multi-layer rotor core centering device with high tightening accuracy, simple structure, safety and reliability.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A single-power multi-layer rotor core centering device includes a spindle base, a core shaft pull rod installed in the spindle base, an expansion block installed on the spindle base, a first disc spring, an inclined wedge mechanism for driving the expansion block to extend and retract, and an existing power mechanism; the core shaft pull rod is connected to the power mechanism; the inclined wedge mechanism is floatingly connected to the core shaft pull rod through the first disc spring, and the first disc spring compensates for the aperture tolerance in the rotor core laminations when the expansion block is expanded, thereby achieving high-precision expansion of the rotor core.

[0008] Preferably, the inclined wedge structure includes a plurality of connected inclined wedge units; the inclined wedge unit includes an inclined wedge block, a spacer ring and a pin; the inclined wedge block and the spacer ring are both sleeved on the core shaft pull rod; the top of the inclined wedge block is provided with an inner lining hole step for accommodating the first disc spring and the spacer ring; the first disc spring is sleeved on the core shaft pull rod and installed in the inner lining hole step; the spacer ring is fixed to the core shaft pull rod by a pin.

[0009] More preferably, the inclined wedge block is a cylindrical inclined wedge block, which is provided with a through hole for the core shaft pull rod to pass through; the inclined wedge block is provided with three inclined wedge surfaces, which match the inclined wedge surfaces on the expansion block; the number of the expansion block is the same as the number of the inclined wedge surfaces.

[0010] More preferably, the centering device is provided with a reset spring; the expansion block is provided with a mounting groove for accommodating the reset spring; the reset spring is a closed annular spring, which passes through the mounting grooves on the three expansion blocks in sequence.

[0011] Preferably, a guide groove for guiding the expansion block is provided on the spindle base at a position corresponding to the expansion block; the expansion block is installed in the guide groove.

[0012] Preferably, a cover plate is installed at one end of the spindle base, and a guide flange for guiding the spindle pull rod is installed at the other end; the spindle pull rod is slidably connected to the guide flange.

[0013] More preferably, the centering device is provided with an oil-free bushing at the connection between the core shaft pull rod and the guide flange.

[0014] More preferably, the centering device is provided with a second disc spring for keeping the expansion block in a tensioned state; the second disc spring is sleeved on the core shaft pull rod, one end of which is connected to the guide flange, and the other end is fixedly connected to the core shaft pull rod through a locking nut.

[0015] Preferably, the centering device is provided with a gasket at the connection between the second disc spring and the locking nut.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. High expansion precision: The wedge mechanism of the present invention compensates for the hole diameter tolerance in the core laminations by arranging disc springs, which greatly improves the expansion precision of the present invention.

[0018] 2. Simple structure: Compared with the traditional screw mechanism, the inclined wedge mechanism in the present invention has a simple structure, the inlay design of the expansion block has good guiding performance, a short dimensional chain, and is easy to process.

[0019] 3. Safe and reliable: The centering device in the present invention is provided with a disc spring for keeping the device clamped. This design makes it unnecessary for the device to use a power mechanism to maintain tension, and the tension can be automatically maintained only by the disc spring.

[0020] 4. High temperature resistance: The main bodies of the mechanisms in the present invention are all steel structures, which have good high temperature resistance and can adapt to high temperature environments.

[0021] 5. Strong applicability: The slanted wedge mechanism in the present invention adopts a design of a combination of multi-layer slanted wedge units, and the length requirement of the rotor core can be met by changing the number of slanted wedge units, which has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a cross-sectional view of the present invention.

[0024] The numbers in the figure show:

[0025] 1. Spindle base, 2. Mandrel pull rod, 3. Oblique wedge block, 4. Expansion block, 5. Spacer ring, 6. First disc spring, 7. Return spring, 8. Guide flange, 9. Oil-free bushing, 10. Lock nut, 11. Gasket, 12. Second disc spring, 13. Pin, 14. Cover plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 creative work should fall within the scope of protection of the present invention.

[0027] The present invention relates to a single-power multi-layer rotor core centering device, such as Figure 1 and Figure 2 As shown, it includes a spindle base 1, a mandrel pull rod 2, an expansion block 4, a first disc spring 6, an angled wedge mechanism and a power mechanism. The mandrel pull rod 2 is installed in the spindle base 1, the expansion block 4 is installed on the spindle base 1, the angled wedge mechanism is floatingly connected to the mandrel pull rod 2 through the first disc spring 6, and the mandrel pull rod 2 is connected to the existing power mechanism.

[0028] The inclined wedge structure is a multi-layer structure, which is composed of a number of connected inclined wedge units. The inclined wedge unit includes an inclined wedge block 3, a spacer ring 5 and a pin 13. The inclined wedge block 3 and the spacer ring 5 are both sleeved on the core shaft pull rod 2. The top of the inclined wedge block 3 is provided with a lining step hole for accommodating the first disc spring 6 and the spacer ring 5. The first disc spring 6 is sleeved on the core shaft pull rod 2 and installed in the lining step hole. The spacer ring 5 is fixed to the core shaft pull rod 2 by the pin 13 and is connected to the first disc spring 6. When the device is in a displacement and expansion state, the expansion block 4 is floatingly connected to the core shaft pull rod 2 through the first disc spring 6, so the displacement of the expansion block 4 will be adjusted in real time according to the aperture of the core laminations, which makes the device compensate for the problem of the aperture tolerance of the core laminations.

[0029] The inclined wedge block 3 in this embodiment is cylindrical and has a through hole for the core shaft pull rod 2 to pass through. The inclined wedge block 3 is provided with three inclined wedge surfaces, and the corresponding number of expansion blocks 4 is also three, and the inclined wedge surfaces on the expansion block 4 match the inclined wedge surfaces on the inclined wedge block 3.

[0030] The centering device in this embodiment is further provided with a reset spring 7, and the expansion block 4 is provided with a mounting groove for accommodating the reset spring 7. The reset spring 7 is a closed ring, passes through the mounting grooves on the three expansion blocks 4 in sequence, and provides a restoring force for the expansion block 4 after it extends.

[0031] The spindle base 1 is provided with guide grooves for accommodating and guiding the expansion blocks 4 , and the number of the guide grooves is the same as the number of the expansion blocks 4 , and the expansion blocks 4 are all installed in the guide grooves.

[0032] A cover plate 14 is installed at one end of the spindle base 1, and a guide flange 8 is installed at the other end. The guide flange 8 is used to guide the mandrel pull rod 2, the mandrel pull rod 2 is slidably connected to the guide flange 8, and an oil-free bushing 9 is provided at the connection between the two.

[0033] The centering device in this embodiment is also provided with a second disc spring 12 for keeping the expansion block 4 in tension. The disc spring is sleeved on the mandrel pull rod 2, one end of which is connected to the guide flange 8, and the other end is connected to the locking nut 10, which is fixed to the mandrel pull rod 2. The second disc spring 12 maintains a compressed state. When the power mechanism is not running, the second disc spring 12 will give the mandrel pull rod 2 a downward thrust to keep the expansion block 4 in a tensioned state.

[0034] The mechanism in this embodiment is a steel structure with good high temperature resistance.

[0035] The working process of the centering device in this embodiment is as follows:

[0036] When the power mechanism is not running, the expansion block 4 remains in a tensioned state. To release the tensioned state, the power mechanism needs to drive the core shaft connecting rod 2 to move a certain distance into the spindle base 1. At this time, the inclined wedge block 3 moves toward the cover plate 14, and the expansion block 4 is reset under the action of the reset spring 7. At this point, the device is in a released state.

[0037] When the power mechanism stops acting on the spindle connecting rod 2, the spindle connecting rod 2 drives the inclined wedge block 3 to move toward the outside of the spindle base 1 under the action of the second disc spring 12, and the expansion block 4 extends a certain distance. At this point, the device is in a tightened state.

[0038] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A single-power multi-layer rotor core centering device, characterized in that: The centering device comprises a spindle base (1), a core shaft pull rod (2) installed in the spindle base (1), an expansion block (4) installed on the spindle base (1), a first disc spring (6), an inclined wedge mechanism for driving the expansion block (4) to extend and retract, and an existing power mechanism; the core shaft pull rod (2) is connected to the power mechanism; the inclined wedge mechanism is floatingly connected to the core shaft pull rod (2) via the first disc spring (6); the first disc spring (6) compensates for the aperture tolerance in the rotor core laminations when the expansion block (4) is expanded, thereby achieving high-precision expansion of the rotor core; The inclined wedge mechanism comprises a plurality of connected inclined wedge units; the inclined wedge unit comprises an inclined wedge block (3), a spacer ring (5) and a pin (13); the inclined wedge block (3) and the spacer ring (5) are both sleeved on the mandrel pull rod (2); the top of the inclined wedge block (3) is provided with an inner lining hole step for accommodating the first disc spring (6) and the spacer ring (5); the first disc spring (6) is sleeved on the mandrel pull rod (2) and installed in the inner lining hole step; the spacer ring (5) is fixed to the mandrel pull rod (2) by means of the pin (13); A cover plate (14) is installed at one end of the spindle base (1), and a guide flange (8) for guiding the spindle pull rod (2) is installed at the other end; the spindle pull rod (2) is slidably connected to the guide flange (8); The centering device is provided with an oil-free bushing (9) at the connection between the core shaft pull rod (2) and the guide flange (8); The centering device is provided with a second disc spring (12) for keeping the expansion block (4) in a tensioned state; the second disc spring (12) is sleeved on the core shaft pull rod (2), one end of which is connected to the guide flange (8) and the other end is fixedly connected to the core shaft pull rod (2) via a locking nut (10).

2. A single-power multi-layer rotor core centering device according to claim 1, characterized in that: The inclined wedge block (3) is a cylindrical inclined wedge block, which is provided with a through hole for the core shaft pull rod (2) to pass through; the inclined wedge block (3) is provided with three inclined wedge surfaces, which match the inclined wedge surfaces on the expansion block (4); the number of the expansion block (4) is the same as the number of the inclined wedge surfaces.

3. A single power multi-layer rotor core centering device according to claim 2, characterized in that: The centering device is provided with a reset spring (7); the expansion block (4) is provided with a mounting groove for accommodating the reset spring (7); the reset spring (7) is a closed annular spring, which sequentially bypasses the mounting grooves on the three expansion blocks (4).

4. A single-power multi-layer rotor core centering device according to claim 1, characterized in that: A guide groove for guiding the expansion block (4) is provided on the spindle base (1) at a position corresponding to the expansion block (4); the expansion block (4) is installed in the guide groove.

5. A single-power multi-layer rotor core centering device according to claim 1, characterized in that: The centering device is provided with a gasket (11) at the connection between the second disc spring (12) and the locking nut (10).

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