An electronic three-phase motor starting protector

Abstract

The present invention discloses an electronic three-phase motor starting protector, comprising a three-phase motor and a power supply box for power supply; the power supply box is electrically connected to the protector, and the electrically connected three-phase motor is disconnected after the protector is overloaded; one end of the protector is electrically connected to a magnetic control switch, the magnetic control switch is electrically connected to a driving component, and the driving component is transmission-connected to a separation component and a brake component; in the present invention, the driving component drives the movable shaft and the positioning shaft in the separation component to separate, so that the external device connected to the output shaft fixedly connected to one end of the positioning shaft is disconnected from the motor shaft, thereby reducing the damage to the motor shaft under synchronous braking of the external device in an emergency braking state, wherein the brake component is separated from the abutment block in the drive component, so that the brake component is fitted with the motor shaft under the action of the arc-shaped spring leaf, so that the brake component can reduce the speed and brake the motor shaft at one end of the overloaded three-phase motor, thereby avoiding the phenomenon of damage to the motor shaft under emergency braking.

Description

Technical Field

[0001] The present invention relates to the technical field of motor protection devices, in particular to an electronic three-phase motor starting protector. Background Art

[0002] An electric motor, commonly known as a motor, is a device that converts or transmits electrical energy based on the law of electromagnetic induction. With the development of society and the advancement of science and technology, the application of automated and mechanized products in our lives has become more and more extensive. Among various mechanical products, the motor is one of the most important driving structures.

[0003] The starting of a motor is an important process in its operation. Whether the motor can start normally is directly related to the operation of the equipment. In actual use, we have found that the existing motors often rotate too fast during the starting process due to current or voltage. Overspeeding of the motor will cause serious damage to the device itself and even lead to some dangerous accidents.

[0004] For example, the Chinese patent with publication number CN112350525A and name "Motor Starting Process Protection Device" includes a rotating shaft, with the reflective tape on the rotating shaft as the signal source, and the proximity sensor can collect signals of the number of rotations of the rotating shaft, thereby realizing the speed monitoring of the output shaft of the motor body. When the motor body is in the starting process, the proximity sensor monitors the speed of the rotating shaft. When the speed is too high, the proximity sensor can control the operation of the drive motor through the circuit board. The operation of the drive motor can make the first clamping rod and the second clamping rod approach each other through the transmission. The first clamping rod and the second clamping rod approach each other and clamp the turntable on the rotating shaft through the deceleration plate, which can slow down the turntable and the rotating shaft to prevent the rotating shaft from rotating too fast and causing damage to the internal parts of the equipment, further improving the safety of the operation of the motor body, and having the advantage of being able to slow down the motor output shaft in time when the speed is too fast during the motor starting process.

[0005] The shortcoming of the existing technology is that the protector can prevent the motor from being damaged by overload after the motor is overloaded. However, when the motor is overloaded and the power is cut off, the protector not only cuts off the power to the motor, but also brakes the external device, causing the motor to stop under the emergency braking of the external device, resulting in damage to the motor under emergency braking. Summary of the Invention

[0006] The purpose of the present invention is to provide an electronic three-phase motor starting protector, which drives the movable shaft and the positioning shaft in the separation component to separate through the driving component, so that the external device connected to the output shaft fixedly connected at one end of the positioning shaft is disconnected from the motor shaft, thereby reducing the damage to the motor shaft under synchronous braking in the emergency braking state of the external device, wherein the brake component is separated from the abutment block in the drive component, so that the brake component is fitted with the motor shaft under the action of the arc-shaped spring leaf, so that the brake component can slow down and brake the motor shaft at one end of the overloaded three-phase motor, thereby avoiding the phenomenon of damage to the motor shaft under emergency braking.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: an electronic three-phase motor starting protector, comprising a three-phase motor and a power supply box;

[0008] The power box is electrically connected to a protector, and the protector disconnects the electrically connected three-phase motor when it is overloaded; one end of the protector is electrically connected to a magnetic control switch, and the magnetic control switch is electrically connected to a drive component, and the drive component is transmission-connected to a separation component and a brake component;

[0009] Separation assembly; the movable shaft and the positioning shaft in the separation assembly are separated or engaged by the driving assembly;

[0010] Braking assembly; the driving assembly drives the braking assembly to open and close, so that the braking assembly can brake the motor shaft;

[0011] Support frame; the support frame is used to support the brake assembly and the separation assembly;

[0012] As a further description of the above technical solution:

[0013] The movable shaft includes a connecting ring 1, one end of the connecting ring 1 is fixedly connected to a gear block 1, and the other end of the connecting ring is fixedly connected to a sleeve, and a limiting groove is provided on the outside of the sleeve.

[0014] As a further description of the above technical solution:

[0015] The positioning shaft includes a connecting ring 2, one end of which is fixedly connected to a tooth block 2 in an array, and the tooth block 2 is engaged with the tooth block 1. The other end of the connecting ring 2 is fixedly connected to a connecting block, a positioning groove is provided on the outside of the connecting block, and the end of the connecting block away from the connecting ring 2 is fixedly connected to the output shaft.

[0016] As a further description of the above technical solution:

[0017] The driving assembly includes a driving pump, and the driving pump is fixed on the three-phase motor. One end of the driving pump is provided with a telescopic rod, and one end of the telescopic rod is fixedly connected to a connecting rod.

[0018] As a further description of the above technical solution:

[0019] One end of the linkage rod is fixedly connected with a stop block, one end of the stop block is fixedly connected with a support rod, and one end of the support rod is fixedly connected with a movable ring.

[0020] As a further description of the above technical solution:

[0021] One end of the three-phase motor is fixedly connected to a motor shaft, one end of the motor shaft is fixedly connected to a rectangular shaft, and a movable shaft is sleeved on the rectangular shaft.

[0022] As a further description of the above technical solution:

[0023] The brake assembly includes an arc-shaped arm, and the arc-shaped arm is movably connected to the support frame. One end of the arc-shaped arm close to the support frame is rotatably connected to a rotating shaft rod, one end of the rotating shaft rod is fixedly connected to a brake wheel, and the brake wheel is adapted to the motor shaft.

[0024] As a further description of the above technical solution:

[0025] One end of the arc-shaped arm is fixedly connected to a connecting rod, and an arc-shaped spring is provided between the two connecting rods.

[0026] As a further description of the above technical solution:

[0027] The support frame includes a fixing ring, one end of the fixing ring is symmetrically fixedly connected to a guide rod, one end of the guide rod away from the fixing ring is fixedly connected to a limiting sleeve, and a positioning shaft is sleeved in the limiting sleeve.

[0028] As a further description of the above technical solution:

[0029] Slide grooves are symmetrically provided at both ends of the movable ring, and the slide grooves are adapted to the guide rods.

[0030] The present invention provides an electronic three-phase motor starting protector, which has the following beneficial effects:

[0031] In the present invention, the movable shaft and the positioning shaft in the separation component are separated by the driving component, so that the external device connected to the output shaft fixedly connected at one end of the positioning shaft is disconnected from the motor shaft, thereby reducing the damage to the motor shaft under synchronous braking in the emergency braking state of the external device, wherein the brake component is separated from the abutment block in the drive component, so that the brake component is fitted with the motor shaft under the action of the arc-shaped spring leaf, so that the brake component can slow down and brake the motor shaft at one end of the overloaded three-phase motor, thereby avoiding the phenomenon of damage to the motor shaft under emergency braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the process of an electronic three-phase motor starting protector proposed by the present invention;

[0033] Figure 2 The figure is a schematic diagram of the structure of an electronic three-phase motor starting protector;

[0034] Figure 3 Schematic diagram of the structure of the motor shaft in the present invention;

[0035] Figure 4 Schematic diagram of the structure of the rectangular shaft in the present invention;

[0036] Figure 5 It is a structural schematic diagram of the separation component in the present invention;

[0037] Figure 6 Schematic diagram of the structure of the output shaft in the present invention;

[0038] Figure 7 Schematic diagram of the structure of the support frame in the present invention;

[0039] Figure 8 Schematic diagram of the structure of the drive assembly in the present invention;

[0040] Figure 9 It is a structural schematic diagram of the brake assembly in the present invention.

[0041] Legend: 1. Three-phase motor; 11. Motor shaft; 12. Rectangular shaft; 2. Power supply box; 3. Protector; 4. Magnetic switch; 5. Drive assembly; 51. Drive pump; 52. Telescopic rod; 53. Connecting rod; 54. Stop block; 55. Support rod; 56. Movable ring; 561. Slide groove; 6. Brake assembly; 61. Arc arm; 62. Rotating shaft; 63. Brake wheel; 64. Connecting rod; 65. Arc spring; 7. Separation assembly; 71. Movable shaft; 711. Connecting ring 1; 712. Gear block 1; 713. Sleeve; 714. Limiting groove; 72. Positioning shaft; 721. Connecting ring 2; 722. Gear block 2; 723. Connecting block; 724. Positioning groove; 73. Output shaft; 8. Support frame; 81. Fixed ring; 82. Guide rod; 83. Limiting sleeve. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0043] Reference Figure 1-9An electronic three-phase motor starting protector includes a three-phase motor 1 and a power supply box 2 for power supply; the power supply box 2 is electrically connected to a protector 3, and the protector 3 disconnects the electrically connected three-phase motor 1 when it is overloaded; one end of the protector 3 is electrically connected to a magnetic control switch 4, and the magnetic control switch 4 is electrically connected to a drive component 5, and the drive component 5 is transmission-connected to a separation component 7 and a brake component 6; the separation component 7; the movable shaft 71 and the positioning shaft 72 in the separation component 7 are separated or engaged by the drive component 5; the brake component 6; the drive component 5 drives the brake component 6 to open and close, so that the brake component 6 brakes the motor shaft 11; the support frame 8; the support frame 8 is used to support the brake component 6 and the separation component 7;

[0044] Specifically, a power box 2 is fixedly connected to the body of the three-phase motor 1, and a protector 3 electrically connected to the power box 2 is electrically connected to the three-phase motor 1. The protector 3 is a thermal relay in the prior art used to protect the three-phase motor 1 from overload. When the protector 3 is disconnected after overload, the magnetic control switch 4 connected to the protector 3 is disconnected and the drive component 5 connected to the magnetic control switch 4 is connected to the power box 2. The drive component 5 connected to the magnetic control switch 4 is connected to the power box 2 for power supply, and the drive component 5 drives the movable shaft 71 in the separation component 7 to separate from the positioning shaft 72, so that The external device connected to the output shaft 73 fixedly connected at one end of the positioning shaft 72 is disconnected from the motor shaft 11 in transmission, thereby reducing damage to the motor shaft 11 under synchronous braking in the emergency braking state of the external device. When the drive assembly 5 drives the separation assembly 7 to move, the brake assembly 6 is separated from the abutment 54 in the drive assembly 5, so that the brake assembly 6 is in contact with the motor shaft 11 under the action of the arc-shaped spring 65, so that the brake assembly 6 can slow down and brake the motor shaft 11 at one end of the overloaded three-phase motor 1, thereby avoiding damage to the motor shaft 11 under emergency braking.

[0045] The movable shaft 71 includes a connecting ring 1 711, one end of which is fixedly connected to a tooth block 1 712 in an array, and the other end of the connecting ring is fixedly connected to a sleeve 713, and a limiting groove 714 is defined on the outside of the sleeve 713; the positioning shaft 72 includes a connecting ring 2 721, one end of the connecting ring 2 721 is fixedly connected to a tooth block 2 722 in an array, and the tooth block 2 722 is engaged with the tooth block 1 712, and the other end of the connecting ring 2 721 is fixedly connected to a connecting block 723, and a positioning groove 724 is defined on the outside of the connecting block 723. The end of the connecting block 723 away from the connecting ring 2 721 is fixedly connected to the output shaft 73;

[0046] When the locking cam 720 is in the unlocking state, the locking cam 712 is locked, and the pinion 720 is locked.

[0047] The driving assembly 5 includes a driving pump 51, and the driving pump 51 is fixed to the three-phase motor 1. A telescopic rod 52 is provided at one end of the driving pump 51, and a connecting rod 53 is fixedly connected to one end of the telescopic rod 52; a stop block 54 is fixedly connected to one end of the connecting rod 53, and a support rod 55 is fixedly connected to one end of the stop block 54, and a movable ring 56 is fixedly connected to one end of the support rod 55; one end of the three-phase motor 1 is fixedly connected to the motor shaft 11, and one end of the motor shaft 11 is fixedly connected to the rectangular shaft 12, and a movable shaft 71 is sleeved on the rectangular shaft 12;

[0048] Specifically, in the initial state of the driving pump 51 in the driving assembly 5, the positioning shaft 72 is meshed with the movable shaft 71 through the telescopic rod 52. When the driving pump 51 is energized, the driving pump 51 drives the movable ring 56 connected to the telescopic rod 52 to move in a directional manner along the guide rod 82. The movable shaft 71 set on the movable ring 56 is separated from the positioning shaft 72. When the driving assembly 5 is protected from overload by the protector 3 for the three-phase motor 1, the magnetic control switch 4 electrically connected to the protector 3 is disconnected, so that the power box 2 and the driving assembly 5 are energized, and the separation assembly 7 disconnects the motor shaft 11 in the three-phase motor 1 from the external device. Open transmission to prevent the motor shaft 11 from being damaged after following the emergency braking of the external device. The block 54 fixedly connected to the connecting rod 53 in the driving assembly 5 is arranged between the two arc-shaped arms 61. The block 54 separates the brake wheels 63 connected to the two arc-shaped arms 61 from the motor shaft 11 when the driving pump 51 is in the initial state. When the driving assembly 5 drives the separation assembly 7 to move, the block 54 separates from the two arc-shaped arms 61. The brake wheels 63 in the arc-shaped arms 61 facilitate the fit of the motor shaft 11, so that the motor shaft 11 is braked when the brake assembly 6 is fitted, and the motor shaft 11 is prevented from continuing to rotate under inertia.

[0049] The brake assembly 6 includes an arc-shaped arm 61, and the arc-shaped arm 61 is movably connected to the support frame 8. One end of the arc-shaped arm 61 close to the support frame 8 is rotatably connected to the rotating shaft rod 62, and one end of the rotating shaft rod 62 is fixedly connected to the brake wheel 63, and the brake wheel 63 is adapted to the motor shaft 11; one end of the arc-shaped arm 61 is fixedly connected to the connecting rod 64, and an arc-shaped spring 65 is provided between the two connecting rods 64; the support frame 8 includes a fixed ring 81, one end of the fixed ring 81 is symmetrically fixedly connected to the guide rod 82, and the end of the guide rod 82 away from the fixed ring 81 is fixedly connected to the limiting sleeve 83, and the positioning shaft 72 is sleeved in the limiting sleeve 83; the two ends of the movable ring 56 are symmetrically provided with sliding grooves 561, and the sliding grooves 561 are adapted to the guide rod 82;

[0050] Specifically, the arc-shaped arm 61 in the brake assembly 6 is rotatably connected to the guide rod 82 in the support frame 8, and the arc-shaped spring 65 connected to the top of the arc-shaped arm 61 is used to tightly fit the brake wheels 63 rotatably connected in the two arc-shaped arms 61 on the motor shaft 11. When the stop block 54 in the drive assembly 5 is pressed between the two arc-shaped arms 61, the brake wheel 63 rotatably connected in the arc-shaped arm 61 is separated from the motor shaft 11, so that the motor shaft 11 does not rub against the brake wheel 63 during normal use. When the stop block 54 is separated from the arc-shaped arm 61, the brake wheel 63 is fitted with the motor shaft 11 under the elastic action of the arc-shaped spring 65 in the arc-shaped arm 61, which facilitates the brake wheel 63 to fit and brake the motor shaft 11, thereby improving the braking effect of the device, and having a simple structure and flexible use.

[0051] Working principle: The three-phase motor 1 is fixedly connected to a power box 2, and the protector 3 electrically connected to the power box 2 is electrically connected to the three-phase motor 1. The protector 3 is a thermal relay in the prior art used to protect the three-phase motor 1 from overload. When the protector 3 is disconnected due to overload, the magnetic control switch 4 connected to the protector 3 is disconnected and the drive component 5 connected to the magnetic control switch 4 is connected to the power box 2. The drive component 5 connected to the magnetic control switch 4 is connected to the power box 2 for power supply, and the drive component 5 drives the movable shaft 71 in the separation component 7 to The positioning shaft 72 is separated. In the initial state of the driving pump 51 in the driving assembly 5, the positioning shaft 72 is engaged with the movable shaft 71 through the telescopic rod 52. When the driving pump 51 is energized, the driving pump 51 drives the movable ring 56 connected to the telescopic rod 52 to move in a directional manner along the guide rod 82. The movable shaft 71 set on the movable ring 56 is separated from the positioning shaft 72. When the driving assembly 5 is protected from overload by the protector 3 for the three-phase motor 1, the magnetic control switch 4 electrically connected to the protector 3 is disconnected, so that the power box 2 and the driving assembly 5 are energized, and the separation is achieved. Component 7 disconnects the transmission between the motor shaft 11 in the three-phase motor 1 and the external device to prevent the motor shaft 11 from being damaged after following the emergency braking of the external device. The block 54 fixedly connected to the linkage rod 53 in the driving component 5 is arranged between the two arc-shaped arms 61. The block 54 separates the brake wheels 63 connected to the two arc-shaped arms 61 from the motor shaft 11 when the driving pump 51 is in the initial state. When the driving component 5 drives the separation component 7 to move, the block 54 separates from the two arc-shaped arms 61, and the brake wheels 63 in the arc-shaped arms 61 facilitate the motor The shaft 11 is in contact with each other, so that the motor shaft 11 is braked when the brake assembly 6 is in contact with each other, so that the external device connected to the output shaft 73 fixedly connected at one end of the positioning shaft 72 is disconnected from the motor shaft 11, thereby reducing the damage to the motor shaft 11 under the synchronous braking of the external device in the emergency braking state. Secondly, the brake assembly 6 is separated from the block 54 in the drive assembly 5, so that the brake assembly 6 is in contact with the motor shaft 11 under the action of the arc-shaped spring leaf 65, so that the brake assembly 6 can slow down and brake the motor shaft 11 at one end of the overloaded three-phase motor 1.

[0052] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An electronic three-phase motor starting protector, characterized in that: It includes a three-phase motor (1) and a power supply box (2); The power box (2) is electrically connected to a protector (3), and the protector (3) disconnects the electrically connected three-phase motor (1) after being overloaded; one end of the protector (3) is electrically connected to a magnetic control switch (4), and the magnetic control switch (4) is electrically connected to a driving component (5), and the driving component (5) is transmission-connected to a separation component (7) and a brake component (6); the driving component (5) includes a driving pump (51), and the driving pump (51) is fixed on the three-phase motor (1), and one end of the driving pump (51) is provided with a telescopic rod (52), and one end of the telescopic rod (52) is fixedly connected to a connecting rod (53); one end of the connecting rod (53) is fixedly connected to a stop block (54), one end of the stop block (54) is fixedly connected to a support rod (55), and one end of the support rod (55) is fixedly connected to a movable ring (56); Separation assembly (7); the movable shaft (71) and the positioning shaft (72) in the separation assembly (7) are separated or engaged by the driving assembly (5); The brake assembly (6) is driven by the driving assembly (5) to open and close the brake assembly (6), so that the brake assembly (6) can brake the motor shaft (11); the brake assembly (6) includes an arc-shaped arm (61), and the arc-shaped arm (61) is movably connected to the support frame (8), and one end of the arc-shaped arm (61) close to the support frame (8) is rotatably connected to a rotating shaft rod (62), and one end of the rotating shaft rod (62) is fixedly connected to a brake wheel (63), and the brake wheel (63) is adapted to the motor shaft (11); one end of the arc-shaped arm (61) is fixedly connected to a connecting rod (64), and the two An arc-shaped spring (65) is provided between the connecting rods (64); when the stop block (54) in the driving assembly (5) is pressed between the two arc-shaped arms (61), the brake wheel (63) rotatably connected in the arc-shaped arm (61) is separated from the motor shaft (11), so that the motor shaft (11) does not rub against the brake wheel (63) in normal use; when the stop block (54) is separated from the arc-shaped arm (61), the brake wheel (63) is fitted with the motor shaft (11) under the elastic action of the arc-shaped spring (65) in the arc-shaped arm (61), so that the brake wheel (63) can fit and brake the motor shaft (11); Support frame (8); the support frame (8) is used to support the brake assembly (6) and the separation assembly (7).

2. The electronic three-phase motor starter protector according to claim 1, characterized in that: The movable shaft (71) comprises a connecting ring (711), one end of which is fixedly connected to a tooth block (712) in an array, and the other end of which is fixedly connected to a sleeve (713), wherein a limiting groove (714) is provided on the outside of the sleeve (713).

3. The electronic three-phase motor starter protector according to claim 1, characterized in that: The positioning shaft (72) includes a second connecting ring (721), one end of the second connecting ring (721) is fixedly connected to a second tooth block (722) in an array, and the second tooth block (722) is engaged with the first tooth block (712), the other end of the second connecting ring (721) is fixedly connected to a connecting block (723), a positioning groove (724) is provided on the outside of the connecting block (723), and the end of the connecting block (723) away from the second connecting ring (721) is fixedly connected to the output shaft (73).

4. The electronic three-phase motor starter protector according to claim 1, characterized in that: One end of the three-phase motor (1) is fixedly connected to a motor shaft (11), one end of the motor shaft (11) is fixedly connected to a rectangular shaft (12), and a movable shaft (71) is sleeved on the rectangular shaft (12).

5. The electronic three-phase motor starter protector according to claim 1, characterized in that: The support frame (8) comprises a fixing ring (81), one end of the fixing ring (81) is symmetrically fixedly connected to a guide rod (82), one end of the guide rod (82) away from the fixing ring (81) is fixedly connected to a limiting sleeve (83), and a positioning shaft (72) is sleeved inside the limiting sleeve (83).

6. The electronic three-phase motor starter protector according to claim 5, characterized in that: Slide grooves (561) are symmetrically provided at both ends of the movable ring (56), and the slide grooves (561) are adapted to the guide rods (82).

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