A fail-safe brake with soft braking

Abstract

The utility model relates to a failure protection brake with soft braking, comprising a frame, an electromagnet, a friction plate and a U-shaped brake spring. Wedge block assemblies are respectively arranged on two sides of the frame, and the wedge block assemblies include a wedge block 1 and a wedge block 2 which are slidably matched through an inclined surface. The two wedge blocks 1 are each provided with a friction plate on one side close to the other. The inner walls at both ends of the U-shaped brake spring respectively conflict with the vertical surfaces of the two wedge blocks 2. Electromagnets are arranged on two sides of the frame, and driving rods are slidably connected on both sides of the frame. One end of the driving rod extending into the frame is fixedly connected with the wedge block 2. A preload spring is sleeved on the driving rod, and the two ends of the preload spring are pressed between the frame and the wedge block 2. The driving rod is connected to the armature of the electromagnet through a lever, and the middle part of the lever is rotatably connected to the frame through a pin shaft, and the choke of the electromagnet is connected to the frame through a screw. The device has a soft braking function, higher safety, low driving power, and small structural size, and can be applied to brake discs of different thicknesses.

Description

Technical Field

[0001] The utility model belongs to the technical field of brake manufacturing, in particular to a failure protection brake with soft braking. Background Art

[0002] The electromagnetic failure brake consists of an electromagnet, a brake spring, a mounting base, a lever, a brake shoe, a friction plate and other connecting devices. It is mainly used for safe braking of the hoisting mechanism of a crane. The electromagnetic force is released and the spring applies force to brake. Its working principle is: when the electromagnet is energized, the electromagnet generates suction, so that the brake shoe is pulled away from the brake disc by the brake arm, and the braking torque is eliminated. When the electromagnet loses power, the spring force causes the brake arm to press the brake shoe and the friction plate to transmit the braking force to the brake disc, generating a braking torque to prevent the brake disc from rotating.

[0003] The existing electromagnetic fail-safe brake has a large driving power, a large braking impact, and a relatively large volume for the same braking force, and the safety of the device needs to be further improved. Therefore, the inventor proposes a fail-safe safety brake to improve the existing electromagnetic fail-safe brake. Utility Model Content

[0004] The purpose of the utility model is to solve the above technical problems and to provide a failure protection brake with soft braking.

[0005] The technical scheme is as follows: a failure protection brake with soft braking, comprising a frame, an electromagnet, a friction plate, a brake disc and a U-shaped brake spring, wherein wedge block assemblies are respectively arranged on both sides of the frame, and the wedge block assembly comprises a wedge block 1 and a wedge block 2 which are slidably matched through an inclined surface, the sides of the wedge block 1 and the wedge block 2 which are opposite to each other are both vertical surfaces, the sides of the two wedge blocks 1 which are close to each other are both provided with friction plates, and a clamping disc groove which matches the brake disc is formed between the two friction plates, the inner walls at both ends of the U-shaped brake spring respectively conflict with the vertical surfaces of the two wedge blocks 2, cavities for the U-shaped brake spring to be deformed are reserved on both sides of the frame, electromagnets are arranged on both sides of the frame, and driving rods are slidably connected on both sides of the frame, and one end of the driving rod extending into the frame is engaged with the wedge block 2 The cam is fixedly connected, and a pre-tightening spring is sleeved on the driving rod, and both ends of the pre-tightening spring are pressed between the frame and the wedge block 2. The driving rod is connected to the armature of the electromagnet through a lever, and the middle part of the lever is rotatably connected to the frame through a pin shaft, and the choke of the electromagnet is connected to the frame through a screw, and the wedge block 2 is slidably connected to the frame through the driving rod, and a wedge block reset spring is connected between the wedge block 1 and the wedge block 2. The top and bottom of the frame are respectively detachably connected with a top cover and a base, and the bottom of the top cover and the top of the base are respectively provided with guide grooves matching with the wedge block 2, and the top of the wedge block 2 is hinged with a screw through a cylindrical pin, and the top end of the screw slides through the top cover and then is threadedly connected to a torque limiting nut, so as to facilitate the adjustment of the maximum braking torque.

[0006] Preferably, a U-shaped groove matching the brake disc is provided on the base, and the sum of the widths of the bottom ends of the two wedge blocks is smaller than the width of the U-shaped groove. A mounting seat is also connected below the base, and bolt holes are evenly distributed on the mounting seat to facilitate the installation of the device.

[0007] Preferably, a lifting ring is provided on the top of the frame to facilitate the lifting of the device.

[0008] Preferably, a terminal box is provided on the top of the top cover, and the electromagnet is electrically connected to the terminal box to facilitate wiring.

[0009] Preferably, the driving rod comprises an upper driving rod and a lower driving rod, the lever comprises an upper lever and a lower lever, the armature is connected to the flat rod, the two ends of the flat rod are respectively hinged to the upper lever and the lower lever, the ends of the upper lever and the lower lever away from the flat rod are respectively hinged to the upper driving rod and the lower driving rod, a threaded guide rod is slidably penetrated on the flat rod, the armature and the choke are provided with through holes matching the threaded guide rod, and the threaded guide rod is fixedly connected to the choke, and a manual nut threadedly connected to the threaded guide rod is provided on the side of the flat rod away from the electromagnet. When the electromagnet loses power, the manual nut can be tightened to make the armature close to the choke, thereby driving the second wedge to slide outward, pulling the friction plate away from the brake disc, realizing manual release, and improving the safety of the device.

[0010] Preferably, a manual forced screw is threadedly connected to the top cover, and the manual forced screw penetrates the top cover and contacts the top of the wedge block 1. Tightening the manual forced screw can make the wedge block move downward, so that the friction plate contacts the brake disc, and loosening the manual forced screw can easily reset the wedge block 1, and it is convenient to adjust the center of the brake disc according to the eccentricity of the brake disc.

[0011] Preferably, a guide needle roller is provided on the inclined surface of the wedge block 1, and the guide needle roller is in sliding contact with the inclined surface of the wedge block 2. This is beneficial to reducing the wear of the inclined surface between the wedge block 1 and the wedge block 2, and is beneficial to extending the service life of the device.

[0012] Preferably, the friction plate is riveted on the vertical surface of wedge block 1 to facilitate replacement of the friction plate.

[0013] Preferably, a travel switch is also provided on the frame, and the travel switch is electrically connected to the terminal box. When in use, the travel switch can detect the suction action of the electromagnet and the wedging action of the wedge block assembly, so as to facilitate the braking state detection of the brake.

[0014] Preferably, torque pre-tightening bolts are slidably penetrated on both sides of the frame, and the torque pre-tightening bolts are fixedly connected to the vertical surface of wedge block 2 after sliding through the U-shaped brake spring. The torque pre-tightening bolts extend to one side outside the frame and are threadedly connected with a pre-tightening nut to adjust the pre-tightening force of the U-shaped brake spring according to the thickness of the brake disc.

[0015] The utility model also includes other components that can enable a fail-safe brake with soft braking to be used normally, all of which are conventional means in the field. In addition, devices or components not limited in the utility model, such as electromagnets, terminal boxes, travel switches, etc., all adopt the existing technology in the field, and those skilled in the art can select the specifications and models of the corresponding devices or components according to actual needs.

[0016] The working principle of the utility model is as follows: when in use, the brake disc is placed between the two friction plates, and the rotation direction of the brake disc is consistent with the wedging direction of the wedge block one. When the electromagnet is energized, the electromagnet generates suction, so that the armature drives the lever close to the throttle, and then the driving rod drives the wedge block two to move to the outside of the frame. Under the traction of the wedge block reset spring, the wedge block one opens outward around the cylindrical pin, so that the friction plate is separated from the brake disc, and the gate is opened. When the electromagnet loses power, the wedge block two is reset and presses the wedge block one under the joint action of the preload spring, the U-shaped brake spring and the wedge block reset spring, so that the friction plates on the two wedge blocks one are pressed against the brake disc. The rotation of the brake disc drives the friction plates to generate friction force to wedge the wedge block assembly to generate braking torque. The U-shaped brake spring plays the purpose of soft braking, which is beneficial to reduce the impact force received by the device during braking.

[0017] Compared with the prior art, the beneficial effects of the utility model are: the device has a soft braking function, higher safety, small driving power, small structural size, longer service life, can be applied to brake discs of different thicknesses, and is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model in the embodiment.

[0019] Figure 2 for Figure 1 The left side structural diagram of .

[0020] Figure 3 for Figure 1 Schematic diagram of the top view structure.

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the U-shaped brake spring in the embodiment. DETAILED DESCRIPTION

[0022] The technology of the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Example:

[0024] like Figures 1 to 4As shown, this embodiment proposes a failure protection brake with soft braking, including a frame 1, an electromagnet 2, a friction plate 3, a brake disc (not shown in the figure) and a U-shaped brake spring 4, a hanging ring 31 is provided on the top of the frame, and wedge block assemblies are respectively provided on both sides of the frame, the wedge block assembly includes a wedge block 1 5 and a wedge block 2 6 that are slidably matched through an inclined surface, the sides of the wedge block 1 and the wedge block 2 that are opposite to each other are both vertical surfaces, the sides of the two wedge blocks 1 that are close to each other are both provided with friction plates, and a clamping disc groove 7 that matches the brake disc is formed between the two friction plates, wherein, in order to facilitate the replacement of the friction plate, the friction plate is riveted to the vertical surface of the wedge block 1. The inner walls at both ends of the U-shaped brake spring respectively conflict with the vertical surfaces of the two wedge blocks 2, and a cavity 41 is reserved on both sides of the frame for the U-shaped brake spring to deform. Electromagnets are provided on both sides of the frame, and driving rods are slidably connected to both sides of the frame. One end of the driving rod extending into the frame is fixedly connected to the wedge block 2, and a preload spring 15 is sleeved on the driving rod. The two ends of the preload spring are pressed between the frame and the wedge block 2. The driving rod is connected to the armature 201 of the electromagnet through a lever, and the middle part of the lever is rotatably connected to the frame through a pin shaft. The yoke 202 of the magnet is connected to the frame by screws, and the wedge block 2 is slidably connected to the frame through a driving rod. A wedge block reset spring 16 is connected between the wedge block 1 and the wedge block 2. The top and bottom of the frame are respectively detachably connected with a top cover 17 and a base 18 by bolts. The bottom of the top cover and the top of the base are respectively provided with guide grooves 19 matching with the wedge block 2. The top of the wedge block 2 is hinged with a screw rod 20 through a cylindrical pin. After the top end of the screw rod slides through the top cover, it is threadedly connected with a torque limiting nut 21 to facilitate the adjustment of the maximum braking torque.

[0025] Specifically, the base is provided with a U-shaped groove 22 matching the brake disc, and the sum of the widths of the bottom ends of the two wedges is smaller than the width of the U-shaped groove. A mounting seat 23 is also connected below the base, and the mounting seat is evenly distributed with bolt holes 24 to facilitate the installation of the device.

[0026] More specifically, a terminal box 25 is provided on the top of the top cover, and a travel switch 26 is also provided on the frame. The electromagnet and the travel switch are electrically connected to the terminal box respectively. When in use, the travel switch can detect the electromagnet's attraction state and the wedging state of the wedge block assembly, which is convenient for brake detection.

[0027] In this embodiment, the driving rod includes an upper driving rod 8 and a lower driving rod 9, the lever includes an upper lever 10 and a lower lever 11, the armature is connected to a flat rod 12, the two ends of the flat rod are respectively hinged to the upper lever and the lower lever, the ends of the upper lever and the lower lever away from the flat rod are respectively hinged to the upper driving rod and the lower driving rod, a threaded guide rod 13 is slidably penetrated on the flat rod, the armature and the choke are provided with through holes matching the threaded guide rod, and the threaded guide rod is fixedly connected to the choke, and a manual nut 14 threadedly connected to the threaded guide rod is provided on the side of the flat rod away from the electromagnet. When the electromagnet loses power, the manual nut can be tightened to make the armature close to the choke, thereby driving the second wedge to slide outward, pulling the friction plate away from the brake disc, realizing manual release, and improving the safety of the device.

[0028] The top cover is threadedly connected with a manual forced screw 27, which penetrates the top cover and contacts the top of the wedge block 1. Tightening the manual forced screw can make the wedge block move downward, so that the friction plate contacts the brake disc, and loosening the manual forced screw can easily reset the wedge block 1, so that the center of the brake disc can be adjusted according to the eccentricity of the brake disc.

[0029] In order to further improve the reliability of the device, a guide needle roller 28 is provided on the inclined surface of the wedge block 1, and the guide needle roller is in sliding contact with the inclined surface of the wedge block 2.

[0030] In addition, torque pre-tightening bolts 29 are slidably penetrated on both sides of the frame. After the torque pre-tightening bolts slide through the U-shaped brake spring, they are fixedly connected to the vertical surface of the second wedge block. The torque pre-tightening bolts extend to one side outside the frame and are threadedly connected with a pre-tightening nut 30 for adjusting the pre-tightening force of the U-shaped brake spring according to the thickness of the brake disc.

[0031] The working principle of the utility model is as follows: when in use, the brake disc is placed between two friction plates, and the rotation direction of the brake disc is aligned with the wedging direction of the wedge block (such as Figure 1 The direction of the arrow is consistent with that shown in the figure. When the electromagnet is energized, the electromagnet generates suction, so that the armature drives the lever close to the throttle, and then the driving rod drives the wedge block 2 to move toward the outside of the frame. Under the traction of the wedge block reset spring, the wedge block 1 opens outward around the cylindrical pin, so that the friction plate is separated from the brake disc, and the gate is opened. When the electromagnet loses power, the wedge block 2 is reset and pressed against the wedge block 1 under the action of the preload spring, U-shaped brake spring and wedge block reset spring, so that the friction plates on the two wedge blocks 1 are pressed against the brake disc. The rotation of the brake disc drives the friction plates to generate friction force to wedge the wedge block assembly to generate braking torque. The U-shaped brake spring achieves the purpose of soft braking, which is beneficial to reduce the impact force on the device during braking.

[0032] 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 principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fail-safe brake with soft braking, comprising a frame, an electromagnet, a friction plate and a brake disc, characterized in that: The invention also includes a U-shaped brake spring, and wedge block assemblies are respectively provided on both sides of the frame, and the wedge block assembly includes a wedge block 1 and a wedge block 2 that are slidably matched through an inclined surface, and the sides of the wedge block 1 and the wedge block 2 that are opposite to each other are both vertical surfaces, and the sides of the two wedge blocks 1 that are close to each other are both provided with friction plates, and a clamping disc groove that matches the brake disc is formed between the two friction plates, and the inner walls at both ends of the U-shaped brake spring respectively conflict with the vertical surfaces of the two wedge blocks 2, and cavities for deformation of the U-shaped brake spring are reserved on both sides of the frame, and electromagnets are provided on both sides of the frame, and driving rods are slidably connected on both sides of the frame, and one end of the driving rod extending into the frame is fixedly connected to the wedge block 2, and a There is a pre-loaded spring, and the two ends of the pre-loaded spring are pressed between the frame and the second wedge block. The driving rod is connected to the armature of the electromagnet through a lever, and the middle part of the lever is rotatably connected to the frame through a pin shaft. The choke of the electromagnet is connected to the frame through a screw. The second wedge block is slidably connected to the frame through the driving rod, and a wedge block reset spring is connected between the first wedge block and the second wedge block. The top and bottom of the frame are respectively detachably connected with a top cover and a base, and the bottom of the top cover and the top of the base are respectively provided with guide grooves matching with the second wedge block. The top of the second wedge block is hinged with a screw through a cylindrical pin, and the top of the screw rod slides through the top cover and is threadedly connected to a torque limiting nut.

2. A fail-safe brake with soft braking according to claim 1, characterized in that: The base is provided with a U-shaped groove matching the brake disc, and the sum of the widths of the bottom ends of the two wedges is smaller than the width of the U-shaped groove. A mounting seat is also connected below the base, and bolt holes are evenly distributed on the mounting seat.

3. A fail-safe brake with soft braking according to claim 1, characterized in that: A lifting ring is arranged on the top of the frame.

4. A fail-safe brake with soft braking according to claim 1, characterized in that: A terminal box is provided on the top of the top cover, and the electromagnet is electrically connected to the terminal box.

5. The fail-safe brake with soft braking according to claim 1, characterized in that: The driving rod includes an upper driving rod and a lower driving rod, the lever includes an upper lever and a lower lever, the armature is connected to the flat rod, the two ends of the flat rod are respectively hinged to the upper lever and the lower lever, the ends of the upper lever and the lower lever away from the flat rod are respectively hinged to the upper driving rod and the lower driving rod, a threaded guide rod is slidably penetrated through the flat rod, the armature and the choke are provided with through holes matching the threaded guide rod, and the threaded guide rod is fixedly connected to the choke, and a manual nut threadedly connected to the threaded guide rod is provided on the side of the flat rod away from the electromagnet.

6. A fail-safe brake with soft braking according to claim 1, characterized in that: The top cover is threadedly connected with a manual forced screw, and the manual forced screw penetrates the top cover and contacts the top end of the wedge block.

7. The fail-safe brake with soft braking according to claim 1, characterized in that: A guide needle roller is arranged on the inclined surface of the wedge block 1, and the guide needle roller is in sliding contact with the inclined surface of the wedge block 2.

8. The fail-safe brake with soft braking according to claim 1, characterized in that: The friction plate is riveted on the vertical surface of wedge block 1.

9. The fail-safe brake with soft braking according to claim 4, characterized in that: The frame is also provided with a travel switch, and the travel switch is electrically connected to the terminal box.

10. A fail-safe brake with soft braking according to any one of claims 1 to 9, characterized in that: The two sides of the frame are slidably penetrated by torque pre-tightening bolts, which are fixedly connected to the vertical surface of the second wedge block after sliding through the U-shaped brake spring. The torque pre-tightening bolts extend to one side outside the frame and are threadedly connected with a pre-tightening nut.

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