Stall protection device for electromechanical equipment

Abstract

The invention relates to a stall protection device for electromechanical equipment, the stall protection device comprises a driving rotating shaft of a driving motor and a box body of the stall protection device, the box body is internally provided with a limiting turntable and a plurality of groups of speed limiting devices, the position of a stall adjusting cylinder is adjusted through an adjusting motor, and then the trigger value of stall protection is adjusted; a second electromagnet is started through centrifugal force, and the second electromagnet and a second magnet block repel each other under the action of magnetic force, so that when a driving rotating shaft rotates, a first electromagnet is alternately started, and corresponding brake pads in each group of first magnet boxes are alternately in contact with a corresponding first brake disc and a corresponding second brake disc; and meanwhile, the corresponding brake pads in each group of first magnet boxes alternately make contact with the corresponding first brake disc and the corresponding second brake disc, the situation that the temperatures of the single brake pad, the first brake disc and the second brake disc are too high is avoided, and then the service life of the stall protection device and the electromechanical equipment is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a stall protection device for electromechanical equipment. Background Art

[0002] Most electromechanical equipment is electrical equipment for mechanical processing. If the output current of the motor increases, the motor may stall, resulting in damage to the workpiece and the machine.

[0003] Most of the existing motor stall protection devices use the speed limit on the surface of the rotating shaft, but it is easy to wear the surface of the rotating shaft, reduce the strength of the rotating shaft, and affect the subsequent safe use. In addition, the Chinese patent with the publication number CN112865022A discloses a stall protection device for electromechanical equipment, including a shell, the outer side of the shell is fixedly connected with a permanent magnet block, the middle inner wall of the shell is movably connected with a rotating shaft, the middle inner wall of the rotating shaft is fixedly connected with a coil, the middle inner wall of the rotating shaft is movably connected with a ball, the middle inner wall of the ball is provided with a centrifugal groove, the middle inner wall of the ball is fixedly connected with a positive plate, the middle inner wall of the ball is fixedly connected with a negative plate, the middle inner wall of the ball is fixedly connected with a varistor, and the inner wall of the centrifugal groove is movably connected with a trigger rod. This electromechanical equipment uses a stall protection device, which drives the ball to move through the rotating shaft, which drives the trigger rod to move, and then the dielectric plate and the varistor are used in conjunction to achieve the effect of detecting overspeed of the rotating shaft, and the sodium azide is driven to move by the heating block, which drives the push rod to operate, and then the limit block and the conductive column are used in conjunction to achieve the effect of stall protection. However, during the speed limiting process, the brake pads will overheat due to high-speed rotation, thereby shortening their service life.

[0004] In view of the shortcomings of existing technologies, further improvements are needed. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a stall protection device for electromechanical equipment to solve the above-mentioned problem.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a stall protection device for electromechanical equipment, comprising a driving shaft of a driving motor and a housing of the stall protection device, a limit turntable and multiple groups of speed limiting devices are arranged in the housing, the driving shaft passes through the housing, the middle part of the limit turntable is fixedly connected to the driving shaft, the interior of the limit turntable is a hollow structure, and a stall trigger mechanism is arranged inside the limit turntable, the stall trigger mechanism corresponds to the number of speed limiting devices one by one, and each group of speed limiting devices includes four first magnet boxes and trigger switches corresponding to the first magnet boxes one by one.

[0007] The bottom end of the first magnet box is fixedly connected to the side of the box body, a first electromagnet is fixed in the first magnet box, and a first slide is slidably connected to the first magnet box near the top, a first magnet block is fixed on the inside of the first slide, a first push-pull rod is fixed on the outside of the first slide, the first push-pull rod passes through the top of the first magnet box, a first mounting panel is fixed on the top of the first push-pull rod, a brake pad is fixed on the first mounting panel, and an annular first brake disc and an annular second brake disc are fixed on both upper and lower sides of the limiting turntable.

[0008] The trigger switch includes a first arc plate, a second arc plate and a second magnet box, wherein the central axes of the first arc plate and the second arc plate coincide with the central axis of the driving shaft, wherein the first arc plate is fixedly connected to the side of the box body, the second arc plate is fixedly connected to the side of the limit turntable, the bottom end of the second magnet box is fixedly connected to the second arc plate, a second electromagnet is fixed in the second magnet box, and a second slide plate is slidably connected to the second magnet box near the top, a second magnet block is fixed on the inner side of the second slide plate, a second push-pull rod is fixed on the outer side of the second slide plate, and the second push-pull rod passes through the top of the second magnet box A second mounting panel is fixed to the top of the second push-pull rod, and a positioning panel is symmetrically fixed to the bottom of the second magnet box. A U-shaped mounting frame is arranged between the two positioning panels, and the positioning panel is fixedly connected to the second mounting panel. A rotating wheel is arranged between the U-shaped mounting frames, and a first trigger sleeve is sleeved on the rotating wheel. Two first trigger pieces are arranged on the first arc plate, and the first trigger piece and the first trigger sleeve are at the same height, so that when the rotating wheel passes through the first arc plate, the first trigger sleeve contacts the first trigger piece, and the two first trigger pieces are respectively connected to the power supply and the corresponding first electromagnet through wires.

[0009] The stall trigger mechanism comprises an adjusting motor and a stall adjusting cylinder, the stall adjusting cylinder slides inside the limit rotating disk, and an adjusting sleeve is fixed to the bottom end of the stall adjusting cylinder, the stall adjusting cylinder and the adjusting sleeve are made of insulating materials, a second trigger sleeve is sleeved on the outer side of the adjusting sleeve, a third trigger sleeve is fixed to the inner wall of the stall adjusting cylinder, the second trigger sleeve and the third trigger sleeve are respectively connected to the power supply and the second electromagnet through wires, a trigger block is slidably connected to the adjusting sleeve, an insulating gasket is fixed to the side of the trigger block, a spring is arranged between the insulating gasket and the top end of the stall adjusting cylinder, one end of the spring is fixedly connected to the insulating gasket, and the other end of the spring is fixedly connected to the top end of the stall adjusting cylinder, a screw is fixed to the output shaft of the adjusting motor, the screw passes through the threaded sleeve, and the screw is threadably matched with the threaded sleeve.

[0010] The beneficial effects of the present invention are as follows: the present invention adjusts the position of the stall adjustment cylinder by adjusting the motor, thereby adjusting the trigger value of the stall protection. When the electromechanical equipment is working, when the driving shaft of the electromechanical equipment rotates, the centrifugal force generated drives the trigger block to slide. When the electromechanical equipment stalls, the second electromagnet is turned on, and the second electromagnet and the second magnet block repel each other under the action of magnetic force, so that when the driving shaft rotates, the first trigger sleeve alternately contacts the first trigger piece on the first arc plate, and the first electromagnet is alternately turned on, and the first electromagnet and the first magnet block repel each other under the action of magnetic force, so that the corresponding brake pads in each group of first magnet boxes alternately contact the corresponding first brake disc and the second brake disc. On the one hand, the friction between the brake pads and the first brake disc and the second brake disc is used to limit the rotation of the driving shaft, and when the electromechanical equipment stalls, stall protection is performed. On the other hand, the corresponding brake pads in each group of first magnet boxes alternately contact the corresponding first brake disc and the second brake disc, so as to avoid excessive temperature caused by continuous contact and friction between a single brake pad and the first brake disc and the second brake disc.

[0011] The present invention utilizes multiple groups of electromagnets, which are triggered by stall protection. The brake pads inside the magnet box are alternately contacted with the brake disc through the mutual repulsion of magnetic force, thereby realizing motor protection and preventing the brake pads from continuously braking. At the same time, alternating braking prevents the brake disc from overheating, thereby extending the service life of the stall protection device and the electromechanical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the structure diagram of the stall protection device;

[0013] Figure 2 This is the internal structure diagram of the first electromagnetic box;

[0014] Figure 3 for Figure 1 A partial enlarged view of the middle part;

[0015] Figure 4 for Figure 1 A partial enlarged view of area B in the middle.

[0016] Numbers in the figure: 1 driving shaft; 2 box; 3 limit turntable; 4 speed limiting device; 5 stall trigger mechanism; 6 first magnet box; 7 trigger switch; 8 first electromagnet; 9 first slide plate; 10 first magnet block; 11 first push-pull rod; 12 first mounting panel; 13 brake pad; 14 first arc plate; 15 second arc plate; 16 second magnet box; 17 second electromagnet; 18 second slide plate; 19 second magnet block; 20 second push-pull rod; 21 second mounting panel; 22 positioning panel; 23 U-shaped mounting frame; 24 rotating wheel; 25 first trigger sleeve; 26 first trigger sheet; 27 first brake disc; 28 second brake disc; 29 adjusting motor; 30 stall adjusting cylinder; 31 adjusting sleeve; 32 second trigger sleeve; 33 third trigger sleeve; 34 trigger block; 35 insulating gasket; 36 spring; 37 screw. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0018] like Figure 1-4 As shown, a stall protection device for electromechanical equipment comprises a driving shaft 1 of a driving motor and a housing 2 of the stall protection device, a limit disc 3 and a plurality of speed limiting devices 4 are arranged in the housing 2, the driving shaft 1 passes through the housing 1, the middle of the limit disc 3 is fixedly connected to the driving shaft 1, the interior of the limit disc 3 is a hollow structure, and a stall trigger mechanism 5 is arranged inside the limit disc 3, the number of the stall trigger mechanism 5 and the speed limiting device 4 correspond one to one, and each group of the speed limiting device 4 comprises four first magnet boxes 6 and trigger switches 7 corresponding one to one to the first magnet boxes 6, as shown in FIG. Figure 1 As shown, it specifically shows the overall structural diagram of the stall protection device and the corresponding positional relationship of the structure.

[0019] In this embodiment, if Figure 2 As shown, the bottom end of the first magnet box 6 is fixedly connected to the side of the box body 2, a first electromagnet 8 is fixed in the first magnet box 6, and a first slide plate 9 is slidably connected to the first magnet box 6 near the top, a first magnet block 10 is fixed on the inside of the first slide plate 9, a first push-pull rod 11 is fixed on the outside of the first slide plate 9, the first push-pull rod 11 passes through the top of the first magnet box 6, a first mounting panel 12 is fixed on the top of the first push-pull rod 11, a brake pad 13 is fixed on the first mounting panel 12, and an annular first brake disc 27 and an annular second brake disc 28 are fixed on both upper and lower sides of the limit turntable 3.

[0020] In this embodiment, the trigger switch 7 includes a first arc plate 14, a second arc plate 15 and a second magnet box 16, wherein the central axes of the first arc plate 14 and the second arc plate 15 coincide with the central axis of the driving shaft 1, wherein the first arc plate 14 is fixedly connected to the side of the box body 2, the second arc plate 15 is fixedly connected to the side of the limit turntable 3, the bottom end of the second magnet box 16 is fixedly connected to the second arc plate 15, a second electromagnet 17 is fixed in the second magnet box 16, and a second slide plate 18 is slidably connected to the second magnet box 16 near the top, a second magnet block 19 is fixed to the inside of the second slide plate 18, a second push-pull rod 20 is fixed to the outside of the second slide plate 18, and the second push-pull rod 20 passes through the second magnet box 1 6, a second mounting panel 21 is fixed to the top of the second push-pull rod 20, a positioning panel 22 is symmetrically fixed to the bottom of the second magnet box 16, a U-shaped mounting frame 23 is arranged between the two positioning panels 22, the positioning panel 22 is fixedly connected to the second mounting panel 21, a rotating wheel 24 is arranged between the U-shaped mounting frame 23, a first trigger sleeve 25 is sleeved on the rotating wheel 24, two first trigger pieces 26 are arranged on the first arc plate 14, the first trigger piece 26 and the first trigger sleeve 25 are at the same height, so that when the rotating wheel 24 passes through the first arc plate 14, the first trigger sleeve 25 contacts the first trigger piece 26, and the two first trigger pieces 26 are respectively connected to the power supply and the corresponding first electromagnet 8 through wires.

[0021] In this embodiment, the stall trigger mechanism 5 includes an adjusting motor 29 and a stall adjusting cylinder 30. The stall adjusting cylinder 30 slides inside the limit rotating disk 3, and an adjusting sleeve 31 is fixed to the bottom end of the stall adjusting cylinder 30. The stall adjusting cylinder 30 and the adjusting sleeve 31 are made of insulating materials. A second trigger sleeve 32 is sleeved on the outer side of the adjusting sleeve 31. A third trigger sleeve 33 is fixed to the inner wall of the stall adjusting cylinder 30. The second trigger sleeve 32 and the third trigger sleeve 33 are connected to the power supply and the second trigger sleeve 33 through wires. The electromagnet 17 is connected, a trigger block 34 is slidably connected to the adjusting sleeve 31, an insulating gasket 35 is fixed to the side of the trigger block 34, a spring 36 is arranged between the insulating gasket 35 and the top of the stall adjusting cylinder 30, one end of the spring 36 is fixedly connected to the insulating gasket 35, and the other end of the spring 36 is fixedly connected to the top of the stall adjusting cylinder 30, a screw 37 is fixed on the output shaft of the adjusting motor 29, the screw 37 passes through the threaded sleeve 31, and the screw 37 is threadedly matched with the threaded sleeve 31.

[0022] The working principle of the present invention is as follows: the stall trigger mechanism 5 of the present invention is adjusted by centrifugal force. When the driving shaft 1 drives the limit turntable 3 to rotate, during the rotation of the limit turntable 3, under the action of centrifugal force, the trigger block 34 slides on the adjustment sleeve 31 and compresses the spring 36. When the limit turntable 3 exceeds the trigger setting value of the stall protection, the trigger block 34 contacts the third trigger cylinder 33, and the circuit between the power supply and the second electromagnet 17 is connected; according to the centrifugal force calculation formula F=mωr (ω refers to the angular velocity of the circular motion of the object, and r refers to the radius of the circular motion of the object), the screw 37 is driven to rotate by the adjusting motor 29, thereby adjusting the distance between the stall adjustment cylinder 30 and the driving shaft 1, thereby adjusting the trigger setting value of the stall protection;

[0023] When the driving shaft 1 rotates and the driving shaft 1 rotates normally, under the elastic force of the spring 36, the trigger block 34 is separated from the third trigger sleeve 33, and the circuit connecting the second electromagnet 17 and the power supply is disconnected. Since the electromagnet includes components such as an iron core, under the action of magnetic force, the second mounting panel 21 is driven to slide, so that during the rotation of the driving shaft 1, the first trigger sleeve 25 is always separated from the first trigger piece 26. At this time, the first electromagnet 8 is closed. Since the electromagnet includes components such as an iron core, under the action of magnetic force, under the action of the first magnet block 10 and the first electromagnet 8, the brake pad 13 is separated from the corresponding first brake disc 27 and the second brake disc 28, and the driving shaft 1 rotates freely. When the driving shaft 1 stalls, under the action of centrifugal force, the spring 36 is compressed, the trigger block 34 contacts the third trigger sleeve 33, and the circuit connecting the second electromagnet 17 and the power supply is connected. The second electromagnet 17 and the second magnet block 19 repel each other under the action of magnetic force, so that when the driving shaft 1 rotates, the first trigger sleeve 25 alternately contacts the first trigger piece 26 on the first arc plate 14, and the first electromagnet 8 is alternately opened. The first electromagnet 8 and the first magnet block 10 repel each other under the action of magnetic force, so that the corresponding brake pads 13 in each group of first magnet boxes 6 alternately contact the corresponding first brake disc 27 and the second brake disc 28. On the one hand, the friction between the brake pads 13 and the first brake disc 27 and the second brake disc 28 is used to limit the rotation of the driving shaft 1, and stall protection is performed when the electromechanical equipment stalls. On the other hand, the corresponding brake pads 13 in each group of first magnet boxes 6 alternately contact the corresponding first brake disc 27 and the second brake disc 28 to avoid excessive temperature caused by continuous contact and friction between a single brake pad 13 and the first brake disc 27 and the second brake disc 28.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A stall protection device for electromechanical equipment, comprising a driving shaft of a driving motor and a housing of the stall protection device, a limit turntable and a plurality of speed limiting devices are arranged in the housing, the driving shaft passes through the housing, the middle of the limit turntable is fixedly connected to the driving shaft, the interior of the limit turntable is a hollow structure, and a stall trigger mechanism is arranged inside the limit turntable, the number of the stall trigger mechanism and the speed limiting device corresponds one to one, each group of the speed limiting device includes four first magnet boxes and trigger switches corresponding one to one to the first magnet boxes, characterized in that: The bottom end of the first magnet box is fixedly connected to the side of the box body, a first electromagnet is fixed in the first magnet box, and a first slide is slidably connected to the first magnet box near the top, a first magnet block is fixed on the inside of the first slide, a first push-pull rod is fixed on the outside of the first slide, the first push-pull rod passes through the top of the first magnet box, a first mounting panel is fixed on the top of the first push-pull rod, a brake pad is fixed on the first mounting panel, and an annular first brake disc and an annular second brake disc are fixed on both upper and lower sides of the limiting turntable.

2. A stall protection device for electromechanical equipment according to claim 1, characterized in that: The trigger switch includes a first arc plate, a second arc plate and a second magnet box, wherein the central axes of the first arc plate and the second arc plate coincide with the central axis of the driving shaft, wherein the first arc plate is fixedly connected to the side of the box body, the second arc plate is fixedly connected to the side of the limit turntable, the bottom end of the second magnet box is fixedly connected to the second arc plate, a second electromagnet is fixed in the second magnet box, and a second slide plate is slidably connected to the second magnet box near the top, a second magnet block is fixed on the inner side of the second slide plate, a second push-pull rod is fixed on the outer side of the second slide plate, and the second push-pull rod passes through the top of the second magnet box A second mounting panel is fixed to the top of the second push-pull rod, and a positioning panel is symmetrically fixed to the bottom of the second magnet box. A U-shaped mounting frame is arranged between the two positioning panels, and the positioning panel is fixedly connected to the second mounting panel. A rotating wheel is arranged between the U-shaped mounting frames, and a first trigger sleeve is sleeved on the rotating wheel. Two first trigger pieces are arranged on the first arc plate, and the first trigger piece and the first trigger sleeve are at the same height, so that when the rotating wheel passes through the first arc plate, the first trigger sleeve contacts the first trigger piece, and the two first trigger pieces are respectively connected to the power supply and the corresponding first electromagnet through wires.

3. The stall protection device for electromechanical equipment according to claim 1, characterized in that: The stall trigger mechanism comprises an adjusting motor and a stall adjusting cylinder, the stall adjusting cylinder slides inside the limit rotating disk, and an adjusting sleeve is fixed to the bottom end of the stall adjusting cylinder, the stall adjusting cylinder and the adjusting sleeve are made of insulating materials, a second trigger sleeve is sleeved on the outer side of the adjusting sleeve, a third trigger sleeve is fixed to the inner wall of the stall adjusting cylinder, the second trigger sleeve and the third trigger sleeve are respectively connected to the power supply and the second electromagnet through wires, a trigger block is slidably connected to the adjusting sleeve, an insulating gasket is fixed to the side of the trigger block, a spring is arranged between the insulating gasket and the top end of the stall adjusting cylinder, one end of the spring is fixedly connected to the insulating gasket, and the other end of the spring is fixedly connected to the top end of the stall adjusting cylinder, a screw is fixed to the output shaft of the adjusting motor, the screw passes through the threaded sleeve, and the screw is threadably matched with the threaded sleeve.

Images