Clamping device for rotor end-to-end welding

Abstract

The utility model relates to a clamping device for motor rotor parallel head welding, which comprises a heat insulation seat provided with a through groove for accommodating a welded rotor parallel head and an induction coil and an avoiding groove for accommodating an adjacent rotor parallel head; and a pressing mechanism. The rotor parallel head can be clamped from the upper side and the lower side through cooperation of the pressing mechanism and the heat insulation base, operation is convenient, the clamping distance is adjustable, the clamping degree is high, stability is good, the gap of the rotor parallel head can be controlled, and the welding quality is guaranteed. The heat insulation base is provided with a through groove used for containing the welded rotor parallel head and the induction coil and an avoiding groove used for containing the adjacent rotor parallel head, and induction brazing of the rotor parallel head can be completed in a high-quality mode under the condition that the arrangement gap of the rotor parallel head is very small.

Description

Technical Field

[0001] The utility model relates to the field of motor winding joint welding, in particular to a clamping device for motor rotor joint welding. Background Art

[0002] The rotor coil is an important component in the generator, and its working performance is directly related to the efficiency and safe operation of the motor. During the manufacturing process of the motor rotor, the rotor coil end needs to be brazed together with the joint sleeve. The welding quality of the joint end of the rotor coil directly affects the performance and reliability of the motor. If the welding quality of the rotor joint is not good, there will be cold welding and poor penetration, the weld will easily crack, which will lead to increased resistance, local overheating during operation, and may damage the insulation protection material of the joint, and even cause the joint to crack, which will cause electrical accidents. The motor winding welding joint must have good electrical conductivity, mechanical properties, corrosion resistance, anti-aging and thermal alternation performance to ensure the long-term safe use of the joint.

[0003] In the brazing of motor rotor joints, limiting the gap of the brazed joint is crucial to improving the efficiency and quality of the welding process. When the joint gap is too small, the gap gas is difficult to discharge, resulting in defects such as incomplete welding and pores; when the joint gap is too large, the capillary effect is weakened, so that the brazing material cannot fill the gap, resulting in reduced brazing joint strength. Large changes in the joint gap will greatly affect the brazing joint density and joint strength. Therefore, a clamping device is required during the brazing of motor rotor joints to control the gap between each strand of wire rods. Using simple mechanical tools for clamping will result in unstable welding quality.

[0004] CN109963364A discloses an invented inductor for electric wave winding brazing, which integrates a magnetic conductor, an induction coil, and a clamp together, and a clamping bracket is installed on the outside of a pressing plate, and the pressing plate is connected to a connector through a nut. The coil and the head are clamped by manual screw tightening.

[0005] CN202498332U discloses a pair of pliers for welding the ends of wound rotors, which utilize spring pressure to clamp the rotor ends with two pliers.

[0006] CN203526751U discloses an induction device for brazing rotor coils of motor exciters, which is designed with a U-shaped metal induction frame that matches the shape of the brazing joint, and uses the alternating magnetic field generated by the medium-frequency current in the U-shaped induction frame and its surroundings to perform induction brazing on the rotor coil to be welded in the induction frame. There is no clamping device.

[0007] On the other hand, since the outer periphery of the pressure ring at the bottom of the rotor coil that needs to be brazed is wrapped with insulating material, flame brazing will damage the insulating material, and the clamping space cannot accommodate resistance welding clamps, so induction brazing is used. With the development of technology, the requirements for motor current density and weight are getting higher and higher, resulting in the distance between motor rotor heads getting smaller and smaller. When welding rotor heads, H-type head sleeves are usually used to strengthen the connection strength. Induction brazing needs to be performed from both sides of the H-type head sleeves. However, the gap between these H-type head sleeves in the rotor is very small, resulting in adjacent rotor heads forming obstacles to induction brazing.

[0008] Therefore, in order to ensure the stability of the rotor head welding quality and the reliability of the high-speed rotation of the rotor in the motor, it is urgently necessary to design a rotor head welding clamping device that is easy to operate, has an adjustable clamping distance, a high clamping degree and is suitable for induction brazing. Utility Model Content

[0009] In order to solve the above technical problems, the utility model provides a clamping device for welding motor rotor ends. The clamping device can be hand-held and easy to operate. The upper and lower clamping distances of the rotor ends are adjustable and the clamping degree is high. The clamping device is particularly suitable for induction brazing of motor rotor ends.

[0010] In order to achieve the above purpose, the utility model proposes the following technical solutions:

[0011] A clamping device for welding motor rotor ends comprises: a heat-insulating seat provided with a through slot for accommodating the welded rotor ends and induction coils and an avoidance slot for accommodating adjacent rotor ends; and a clamping mechanism.

[0012] In a preferred embodiment, the clamping device for welding the motor rotors together may include a clamping mechanism that includes a driving mechanism and a pressing block that are connected to each other.

[0013] In a preferred embodiment, the clamping device for welding the motor rotors together has a driving mechanism comprising a cylinder, and a retractable movable end of the cylinder is fixedly connected to the pressing block.

[0014] In a preferred embodiment, the motor rotor head welding clamping device has a heat-insulating seat with a detachable top cover, and the top cover is provided with a through hole or a slot through which the pressing block can pass.

[0015] In a preferred embodiment, the clamping device for welding the motor rotors together and the heat-insulating seat is a U-shaped seat.

[0016] In a preferred embodiment, the motor rotor head welding clamping device and the heat-insulating seat are integrally formed.

[0017] In a preferred embodiment, the clamping device for welding the motor rotors together and the heat-insulating seat are made of one or more heat-insulating materials selected from inorganic materials, polymer materials and composite materials thereof.

[0018] In a preferred embodiment, the motor rotor head welding clamping device and the heat-insulating seat are made of glass fiber resin composite material.

[0019] Compared with the prior art, the utility model has the following beneficial effects: the clamping device for welding the motor rotor joints of the utility model can clamp the rotor joints from the upper and lower sides through the clamping mechanism and the heat-insulating seat, which is easy to operate, has an adjustable clamping distance, a high clamping degree, good stability, and can control the gap of the rotor joints to ensure the welding quality. The heat-insulating seat is provided with a through groove for accommodating the welded rotor joint and the induction coil and an avoidance groove for accommodating the adjacent rotor joints, and can complete the induction brazing of the rotor joints with high quality when the gap between the rotor joints is very small. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a clamping device of an embodiment used for induction brazing of rotor ends;

[0021] Figure 2 It is a schematic diagram of a heat-insulating seat of a clamping device for welding rotor ends in an embodiment.

[0022] In the figure: H-shaped parallel head cover 1, parallel head 2, induction coil 3, heat insulation block 4, pressure block 5, top cover 6, heat insulation seat 7, driving mechanism 8, telescopic movable end 9, through slot 70, avoidance slot 71. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] The utility model provides a clamping device for welding motor rotor joints, comprising: a heat-insulating seat, provided with a through slot for accommodating the welded rotor joint and the induction coil and an avoidance slot for accommodating the adjacent rotor joint; and a clamping mechanism. The clamping mechanism cooperates with the heat-insulating seat to clamp the rotor joint from both sides. The device is easy to operate, has an adjustable clamping distance, a high clamping degree, good stability, and can control the gap of the rotor joint to ensure welding quality.

[0025] In a preferred embodiment, the clamping mechanism may include a driving mechanism and a pressing block that are connected to each other. The driving mechanism can drive the pressing block to move up and down so as to loosen and press down the parallel head. Any existing driving method can be used. In a preferred embodiment, the driving device includes a cylinder, an electric push rod, a servo push rod, and a ball screw nut pair. More preferably, the driving mechanism includes a cylinder, and the retractable movable end of the cylinder is fixedly connected to the pressing block. Under the lifting and pushing action of the cylinder, the pressing block moves up and down accordingly, thereby loosening and pressing down the parallel head. The lower part of the pressing block is preferably made of heat-insulating insulating material.

[0026] In the clamping device of the utility model, the heat-insulating seat is provided with a through groove for accommodating the welded rotor joint and the induction coil and an avoidance groove for accommodating the adjacent rotor joint. Since there are a large number of joints on the rotor and the gap between the adjacent joints on the left and right is very small, the design of the avoidance groove allows the rotor joint induction brazing device to be inserted and withdrawn flexibly and unhindered, and the induction welding of the target joint will not affect the adjacent joints. The heat-insulating seat can be a U-shaped seat, which can be integrally formed, and the avoidance grooves are provided on the outer sides of the two side walls of the U-shaped seat, and the middle through groove of the U-shaped seat is the induction welding area. In a preferred embodiment, the heat-insulating seat has a detachable top cover, and the top cover is provided with a through hole through which the pressure block can pass.

[0027] Example

[0028] Figure 1-2 An embodiment of the clamping device of the utility model is shown. The clamping device includes a heat-insulating seat 7 and a clamping mechanism. The heat-insulating seat 7 is provided with a through groove 70 for accommodating the welded rotor head and the induction coil and an avoidance groove 71 for accommodating the adjacent rotor head. The clamping mechanism may include a driving mechanism 8 and a pressing block 5 that are connected to each other. The driving mechanism 8 in the embodiment is a cylinder, and the retractable movable end 9 of the cylinder is fixedly connected to the pressing block 5. Under the lifting and pushing action of the cylinder, the pressing block moves up and down, thereby achieving the loosening and downward pressing of the head. The heat-insulating seat 7 is provided with a top cover 6, the top cover 6 is detachable, the top cover 6 can be heat-insulated, and the specific material can be the same as the heat-insulating seat 7. A through hole through which the pressing block 5 can pass is provided in the top cover 7, and the pressing block 5 is inserted in the top cover 6 and can move freely up and down.

[0029] When induction brazing of rotor joints is performed, the target rotor joint 2 equipped with the H-type joint cover 1 and the induction coils 3 on both sides are accommodated in the through groove 70 of the heat-insulating seat 7, and the joints adjacent to the target joint are accommodated in the avoidance groove 7 of the heat-insulating seat 7. The pressing block 5 of the clamping mechanism cooperates with the heat-insulating block 6 arranged on the heat-insulating seat 7 to clamp the rotor joint from the upper and lower sides for induction welding.

[0030] The practice of using the clamping device of the utility model for induction brazing of rotor heads shows that the clamping device of the utility model is easy to operate, has an adjustable clamping distance, a high clamping degree, good stability, can control the gap of the rotor heads, and ensure the welding quality. The heat-insulating seat is provided with a through groove for accommodating the welded rotor heads and the induction coil and an avoidance groove for accommodating adjacent rotor heads, which can effectively prevent the adjacent rotor heads from being affected by the induced magnetic field, and can complete the induction brazing of the rotor heads with high quality when the gap between the rotor heads is very small.

Claims

1. A clamping device for rotor head welding, characterized in that include: The heat-insulating seat is provided with a through groove for accommodating the welded rotor head and the induction coil and an avoidance groove for accommodating the adjacent rotor head; and a clamping mechanism.

2. The rotor head welding clamping device according to claim 1 is characterized in that The pressing mechanism may include a driving mechanism and a pressing block connected to each other.

3. The rotor head welding clamping device according to claim 2 is characterized in that The driving mechanism comprises a cylinder, and a telescopic movable end of the cylinder is fixedly connected to the pressing block.

4. The clamping device for rotor joint welding according to claim 1 is characterized in that The heat-insulating seat is provided with a detachable top cover, and a through hole or a slot through which the pressing block can pass is arranged in the top cover.

5. The clamping device for rotor joint welding according to claim 1 is characterized in that The heat-insulating seat is a U-shaped seat.

6. The clamping device for rotor joint welding according to claim 1 is characterized in that The heat-insulating seat is made of one piece.

7. The clamping device for rotor joint welding according to claim 1 is characterized in that The heat-insulating seat is made of a heat-insulating material selected from inorganic materials, polymer materials and composite materials thereof.

8. The clamping device for rotor joint welding according to claim 7 is characterized in that The thermally insulated base is made of fiberglass resin composite material.

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