Bucket screen overturn-preventing device

Abstract

The utility model relates to the technical field of bucket screen lifting, and provides a bucket screen anti-overturning device which comprises a plurality of sets of lifting mechanisms evenly and symmetrically distributed above a bucket screen, each set of lifting mechanism comprises a motor, a transmission structure, a reel and a sling, and the sling suspends the bucket screen; each lifting mechanism further comprises a monitoring device and a dual-control braking device; the monitoring device comprises a background control center, a speed measurement sensor and a tilt angle sensor; the speed measurement sensor is used for monitoring the rotating speed of the motor; the tilt angle sensor is used for monitoring the tilt angle of the bucket screen; the double-control braking device comprises an electromagnetic brake and a hydraulic brake which are arranged at the two ends of the transmission structure respectively. When the inclination angle of the bucket screen is too large or a plurality of lifting mechanisms do not lift synchronously, the lifting mechanisms are subjected to emergency double braking, and the bucket screen is prevented from overturning.

Description

Technical Field

[0001] The utility model belongs to the technical field of the lifting of a funnel-shaped screen, and particularly relates to an anti-overturning device for a funnel-shaped screen. Background Art

[0002] At present, LED displays are respectively arranged in all directions in the center of a venue. Because of their funnel-like shape, they are called "funnel-shaped screens", which can play graphic and text information in different directions, enabling audiences to clearly view from any angle. To ensure the best viewing effect for the audience, the funnel-shaped screen needs to be lifted and adjusted to an appropriate height. The conventional method is to connect multiple lifting mechanisms above the funnel-shaped screen and use the multiple lifting mechanisms to lift or lower synchronously to adjust the funnel-shaped screen to an appropriate height. The lifting mechanism generally includes a motor, a reel connected to the front end of the motor, and a suspension cable wound around the reel, and the suspension cable suspends the funnel-shaped screen. However, the braking device of the existing lifting mechanism is usually a single braking. If the braking device of a certain lifting mechanism fails, it will cause the lifting of multiple lifting mechanisms to be asynchronous, resulting in an excessive inclination angle of the funnel-shaped screen. For such a large component as the funnel-shaped screen, if the braking system fails, it will cause the serious consequence of overturning and cannot meet the safety requirements. Content of the Utility Model

[0003] Aiming at the problems in the above-mentioned prior art, the present application proposes an anti-overturning device for a funnel-shaped screen, which performs an emergency double braking on the lifting mechanism when the inclination angle of the funnel-shaped screen is too large or the lifting of multiple lifting mechanisms is asynchronous, so as to avoid the overturning of the funnel-shaped screen.

[0004] The utility model provides an anti-overturning device for a funnel-shaped screen, which comprises multiple sets of lifting mechanisms evenly and symmetrically distributed above the funnel-shaped screen. Each set of the lifting mechanisms comprises a motor, a transmission structure and a reel connected to the output shaft of the motor, and a suspension cable wound around the reel, and the suspension cable suspends the funnel-shaped screen; each set of the lifting mechanisms further comprises a monitoring device and a double control braking device;

[0005] The monitoring device comprises a background control center, a speed measurement sensor and an inclination angle sensor which are electrically connected to the background control center. The speed measurement sensor is installed at the end of the output shaft of the motor and is used for monitoring the rotation speed of the motor; the inclination angle sensor is installed on the funnel-shaped screen and is used for monitoring the inclination angle of the funnel-shaped screen;

[0006] The double control braking device comprises an electromagnetic brake and a hydraulic brake respectively arranged at two ends of the transmission structure; the electromagnetic brake and the hydraulic brake are also respectively electrically connected to the background control center.

[0007] Further, the electromagnetic brake includes: a first brake disc, an armature, a brake spring, and a coil; the first brake disc is fixedly connected to one end of the transmission structure; the armature is disposed opposite to the first brake disc; the coil and the brake spring are disposed at one end of the armature facing away from the first brake disc; the coil is electrically connected to the background control center, generating an electromagnetic attraction force to attract the armature to separate from the first brake disc and compress the brake spring.

[0008] Further, the electromagnetic brake further includes a yoke; the yoke is disposed around the coil to restrict the leakage magnetic field of the coil from diffusing outwards.

[0009] Further, the electromagnetic brake further includes a housing, a hollow bolt, and mounting screws; the housing surrounds the first brake disc, the armature, the brake spring, and the coil; the hollow bolt is disposed on the housing; the hollow bolt passes through the first brake disc and the armature; the mounting screws pass through the transmission structure and are connected to the hollow bolt.

[0010] Further, the electromagnetic brake further includes a release plate and a release screw; the release plate is embedded in the housing and abuts against one end of the yoke facing away from the armature; one end of the brake spring is connected to the release plate, and the other end is connected to the armature; the release screw is connected to the release plate and the housing.

[0011] Further, the hydraulic brake includes: a second brake disc, brake pads, a brake caliper, and a brake cylinder; the second brake disc is fixedly connected to the other end of the transmission structure; the brake caliper clamps on both sides of the second brake disc and is connected to both ends of the brake cylinder; the brake pads are disposed between the brake caliper and the second brake disc and are connected to the brake caliper; the brake cylinder is provided with an oil hole, the oil hole is connected to a hydraulic source, and the hydraulic source is electrically connected to the background control center.

[0012] Further, the hydraulic brake further includes a threaded bolt, and the brake calipers on both sides of the second brake disc are connected by the threaded bolt.

[0013] Further, the hydraulic brake further includes a tightening screw; the tightening screw passes through the threaded bolt and is connected to the brake caliper.

[0014] Further, the hydraulic brake further includes a disc spring and an adjusting nut; the brake cylinder includes a cylinder block and a piston rod; the adjusting nut is threadedly connected to one end of the cylinder block away from the piston rod; the disc spring is sleeved outside the cylinder block, one end of which is fixedly connected to the piston rod, and the other end abuts against the adjusting nut.

[0015] Further, the hydraulic brake further includes a manual release nut; the manual release nut is threadedly connected to an end of the piston rod away from the cylinder block.

[0016] The beneficial effects of the present utility model include: the rotation speed of the motor is monitored by a speed measurement sensor, and the inclination angle of the bucket screen is monitored by an inclination sensor. When the bucket screen has situations such as asynchronous lifting, excessive inclination angle, overspeed, overweight, etc., the double control braking device electrically connected to the background control center is used to perform emergency braking on the transmission structure of the lifting mechanism to avoid the tipping of the bucket screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the anti-tipping device of the bucket screen of the present utility model;

[0018] Figure 2 is a schematic cross-sectional structure diagram of the electromagnetic brake of the anti-tipping device of the bucket screen of the present utility model;

[0019] Figure 3 is Figure 2 a side view structural diagram of;

[0020] Figure 4 is a schematic structural diagram of the hydraulic brake of the anti-tipping device of the bucket screen of the present utility model;

[0021] Figure 5 is Figure 4 a partial top view structural diagram of the hydraulic brake of;

[0022] In the figure: 1 - electromagnetic brake; 2 - hydraulic brake; 3 - speed measurement sensor; 4 - inclination sensor; 5 - bucket screen;

[0023] 101 - armature; 102 - brake spring; 103 - release screw; 104 - release plate; 105 - coil; 106 - yoke; 107 - housing; 108 - hollow bolt; 109 - mounting screw; 110 - first brake disc;

[0024] 201 - second brake disc; 202 - brake pad; 203 - brake caliper; 204 - tightening screw; 205 - threaded bolt; 206 - manual release nut; 207 - oil hole; 208 - brake cylinder; 209 - piston rod; 210 - disc spring; 211 - adjusting nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further describes the present utility model in detail with reference to the accompanying drawings and specific embodiments.

[0026] As Figure 1As shown in the figure, the anti-overturning device of the bucket screen of the present utility model includes multiple sets of lifting mechanisms evenly and symmetrically distributed above the bucket screen 5. Each set of lifting mechanisms includes a motor, a transmission structure connected to the output shaft of the motor, a reel, and a sling wound around the reel. The sling suspends the bucket screen 5. Among them, the transmission structure can be a transmission shaft.

[0027] Each set of lifting mechanisms further includes a monitoring device and a dual-control braking device.

[0028] The monitoring device includes a background control center, a speed sensor 3 and an inclination sensor 4 electrically connected to the background control center. The speed sensor 3 is installed at the end of the output shaft of the motor and is used to monitor the rotation speed of the motor. The inclination sensor 4 is installed on the bucket screen 5 and is used to monitor the inclination angle of the bucket screen 5. The background control center is also electrically connected to the motor and is used for the on-off control of the motor.

[0029] The dual-control braking device includes an electromagnetic brake 1 and a hydraulic brake 2 respectively arranged at both ends of the transmission structure. The electromagnetic brake 1 and the hydraulic brake 2 are also respectively electrically connected to the background control center.

[0030] In this embodiment, the electromagnetic brake 1 and the hydraulic brake 2 work simultaneously and can independently complete the braking and stopping actions of the entire lifting mechanism to ensure the stable descent and ascent of the bucket screen 5. The electromagnetic brake 1 is at the front end of the transmission structure and requires a smaller braking torque. It can be controlled by the output signal of the motor driver, with a fast response speed and convenient control. The hydraulic brake 2 is at the end of the transmission structure and requires a large braking torque, playing a protective role in the safe operation of the entire system at the end.

[0031] As Figure 2 、 Figure 3 shown, the electromagnetic brake 1 includes: a first brake disc 110, an armature 101, a brake spring 102, a coil 105, a yoke 106, a housing 107, a hollow bolt 108, a mounting screw 109, a release plate 104 and a release screw 103.

[0032] The first brake disc 110 is fixedly connected to one end of the transmission structure. The armature 101 is arranged opposite to the first brake disc 110. A coil 105 and a brake spring 102 are arranged at one end of the armature 101 facing away from the first brake disc 110. The coil 105 is electrically connected to the background control center and generates an electromagnetic suction force to attract the armature 101 to separate from the first brake disc 110 and compress the brake spring 102.

[0033] The yoke 106 is arranged around the coil 105 to restrict the leakage magnetic field of the coil 105 from diffusing outward, improve the magnetic induction intensity, and ensure the braking effect.

[0034] The housing 107 encloses the first brake disc 110, the armature 101, the brake spring 102, and the coil 105; a hollow bolt 108 is provided on the housing 107; the hollow bolt 108 passes through the first brake disc 110 and the armature 101; the mounting screw 109 passes through the transmission structure and is connected to the hollow bolt 108. The housing 107 is fixed to the transmission structure of the motor through the hollow bolt 108. By adjusting the fixed distance of the mounting screw 109 within the hollow bolt 108, the distance between the first brake disc 110 and the armature 101 can be adjusted. During use, after the friction plate between the first brake disc 110 and the armature 101 wears, it can be adjusted multiple times, increasing the service life of the electromagnetic brake 1.

[0035] The release plate 104 is embedded in the housing 107 and abuts against one end of the yoke 106 facing away from the armature 101; one end of the brake spring 102 is connected to the release plate 104, and the other end is connected to the armature 101; the release screw 103 is connected to the release plate 104 and the housing 107. By manually adjusting the position of the release plate 104 through the release screw 103 at the top of the release plate 104, the electromagnetic brake 1 is released, and the equipment can be repaired under the condition of power failure.

[0036] When the electrical signals representing the rotational speed and tilt angle of the motor obtained by the background control center through the speed sensor 3 and the tilt sensor 4 are normal, an electromagnetic suction force is generated by the current passing through the coil 105 to attract the armature 101, compressing the brake spring 102, and the first brake disc 110 is disengaged from the end cover of the armature 101, and the motor operates normally. When abnormal conditions occur during the operation of the bucket screen 5 and braking is required, the background control center cuts off the electrical signals of the drive motor and the dual control braking device, the coil 105 loses its magnetic suction force, and the armature 101 compresses the first brake disc 110 under the push of the brake spring 102. Under the action of the frictional torque, the motor immediately stops running.

[0037] As Figure 4 、 Figure 5 shown, the hydraulic brake 2 includes: a second brake disc 201, a brake pad 202, a brake caliper 203, and a brake cylinder 208; the second brake disc 201 is fixedly connected to the other end of the transmission structure; the brake caliper 203 is clamped on both sides of the second brake disc 201 and is connected to both ends of the brake cylinder 208; the brake pad 202 is arranged between the brake caliper 203 and the second brake disc 201 and is connected to the brake caliper 203; the brake cylinder 208 is provided with an oil hole 207, and the oil hole 207 is connected to a hydraulic source, and the hydraulic source is electrically connected to the background control center.

[0038] The hydraulic brake 2 further includes a threaded bolt 205, and the brake calipers 203 on both sides of the second brake disc 201 are connected by the threaded bolt 205. The distance between the second brake disc 201 and the brake pad 202 can be adjusted through the threaded bolt 205, avoiding excessive drag force caused by too small a distance and prolonging the braking time due to too large a distance.

[0039] The hydraulic brake 2 further includes a tightening screw 204; the tightening screw 204 passes through the threaded bolt 205 and is connected to the brake caliper 203. After adjusting the threaded bolt 205, the threaded bolt 205 is fastened by the tightening screw 204.

[0040] The hydraulic brake 2 further includes a disc spring, an adjusting nut 211 and a manual release nut 206; the brake cylinder 208 includes a cylinder block and a piston rod 209; the adjusting nut 211 is threadedly connected to one end of the cylinder block away from the piston rod 209; the disc spring is sleeved outside the cylinder block, one end of which is fixedly connected to the piston rod 209, and the other end abuts against the adjusting nut 211. The braking torque can be adjusted by adjusting the deformation amount of the disc spring 210 through the adjusting nut 211.

[0041] The manual release nut 206 is threadedly connected to one end of the piston rod 209 away from the cylinder block. When the electrical signal is interrupted, the piston rod 209 can be pushed by tightening the manual release nut 206 to compress the disc spring 210, so that the brake caliper 203 is separated, realizing manual brake release of the hydraulic brake 2.

[0042] When the electrical signals representing the rotational speed and tilt angle of the motor obtained by the speed sensor 3 and the tilt sensor 4 by the background control center are normal, the oil hole 207 is connected to the hydraulic source, so that the piston rod 209 is pushed outwards, the disc spring 210 is opened, the brake caliper 203 is driven to separate, and the brake pads 202 and the second brake disc 201 maintain a certain braking gap without friction, and the bucket screen 5 operates normally. When the bucket screen 5 operates abnormally and brakes, the electrical signal is cut off, the hydraulic source no longer supplies oil, the oil pressure in the brake cylinder 208 is eliminated, the brake caliper 203 returns, the disc spring 210 retracts, and both sides of the brake pads 202 press on the second brake disc 201 to clamp the second brake disc 201 to brake, and the second brake disc 201 is connected to the transmission structure, and the transmission structure is braked.

[0043] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A bucket screen anti-overturning device, comprising a plurality of lifting mechanisms evenly and symmetrically distributed above the bucket screen, each of the lifting mechanisms comprising a motor, a transmission structure and a reel connected to the output shaft of the motor, and a sling wound on the reel, wherein the sling suspends the bucket screen; characterized in that: Each set of the lifting mechanism also includes a monitoring device and a dual-control braking device; The monitoring device includes a background control center and a speed sensor and an inclination sensor connected to the background control center by electrical signals; the speed sensor is installed at the output shaft end of the motor to monitor the speed of the motor; the inclination sensor is installed on the bucket screen to monitor the inclination angle of the bucket screen; The dual-control braking device comprises an electromagnetic brake and a hydraulic brake respectively arranged at two ends of the transmission structure; the electromagnetic brake and the hydraulic brake are also respectively connected to the background control center via electrical signals.

2. The bucket screen anti-overturning device according to claim 1, characterized in that: The electromagnetic brake includes: a first brake disc, an armature, a brake spring and a coil; the first brake disc is fixedly connected to one end of the transmission structure; the armature is arranged opposite to the first brake disc; the coil and the brake spring are arranged at the end of the armature facing away from the first brake disc; the coil is electrically connected to the background control center to generate electromagnetic attraction to attract the armature to separate from the first brake disc and compress the brake spring.

3. The bucket screen anti-overturning device according to claim 2, characterized in that: The electromagnetic brake further comprises a yoke; the yoke is arranged around the coil to restrict the magnetic flux leakage of the coil from spreading outwards.

4. The bucket screen anti-overturning device according to claim 3, characterized in that: The electromagnetic brake also includes a shell, a hollow bolt and a mounting screw; the shell surrounds the first brake disc, the armature, the brake spring and the coil; the hollow bolt is arranged on the shell; the hollow bolt passes through the first brake disc and the armature; the mounting screw passes through the transmission structure and is connected to the hollow bolt.

5. The bucket screen anti-overturning device according to claim 4, characterized in that: The electromagnetic brake also includes a release plate and a release screw; the release plate is embedded in the shell and pressed against the end of the yoke facing away from the armature; one end of the brake spring is connected to the release plate, and the other end is connected to the armature; the release screw is connected to the release plate and the shell.

6. The bucket screen anti-overturning device according to claim 1, characterized in that: The hydraulic brake includes: a second brake disc, a brake pad, a brake caliper and a brake cylinder; the second brake disc is fixedly connected to the other end of the transmission structure; the brake caliper is clamped on both sides of the second brake disc and connected to both ends of the brake cylinder; the brake pad is arranged between the brake caliper and the second brake disc and connected to the brake caliper; the brake cylinder is provided with an oil hole, the oil hole is connected to a hydraulic source, and the hydraulic source is connected to an electrical signal of the background control center.

7. The bucket screen anti-overturning device according to claim 6, characterized in that: The hydraulic brake further includes a threaded bolt, and the brake calipers on both sides of the second brake disc are connected by the threaded bolt.

8. The bucket screen anti-overturning device according to claim 7, characterized in that: The hydraulic brake further comprises a tightening screw; the tightening screw passes through the threaded bolt and is connected to the brake caliper.

9. The bucket screen anti-overturning device according to claim 7, characterized in that: The hydraulic brake also includes a butterfly spring and an adjusting nut; the brake cylinder includes a cylinder body and a piston rod; the adjusting nut is threadedly connected to one end of the cylinder body away from the piston rod; the butterfly spring is sleeved on the outside of the cylinder body, one end of which is fixedly connected to the piston rod and the other end abuts against the adjusting nut.

10. The bucket screen anti-overturning device according to claim 9, characterized in that: The hydraulic brake further comprises a manually loosening nut; the manually loosening nut is threadedly connected to an end of the piston rod away from the cylinder body.

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