Double-electromagnet type electromagnetic drum brake

Abstract

The utility model discloses a double-electromagnet type electromagnetic drum brake which comprises a base, two brake arms are symmetrically arranged on the base and connected with the base through pin shafts, electromagnets are arranged on the opposite sides, away from each other, of the two brake arms, supporting frames are arranged at the bottom ends of the two electromagnets, and the two electromagnets are connected with the base through the supporting frames through the pin shafts. The top ends of the two electromagnets are connected through a traction adjusting assembly. The traction adjusting assembly comprises a traction screw rod, a first traction screw sleeve and a second traction screw sleeve, the first traction screw sleeve and the second traction screw sleeve are arranged corresponding to the two electromagnets respectively, one end of the first traction screw sleeve and one end of the second traction screw sleeve are connected with first connecting lug pin shafts arranged at the top ends of the corresponding electromagnets respectively, and the other end of the first connecting lug pin shafts are connected with second connecting lug pin shafts arranged at the top ends of the corresponding electromagnets respectively. The other end of the first traction threaded sleeve and the other end of the second traction threaded sleeve are in threaded connection with the two ends of the traction threaded rod respectively, and the external threads at the two ends of the traction threaded rod are opposite in rotating direction.

Description

Technical Field

[0001] The utility model relates to the field of brakes, in particular to a double-electromagnet electromagnetic drum brake. Background Art

[0002] Electromagnetic brakes are currently widely used in medium-sized industrial applications such as lifting, port loading and unloading, and metallurgical machinery. They are an ideal automated actuator in modern industry. In mechanical transmission systems, their primary function is to quickly stop a machine and immobilize the device. An industrial electromagnetic brake is a connector that transmits torque from the active side to the passive side, allowing it to be freely engaged, disengaged, or braked as needed. Because it uses electromagnetic force for activation, it is called an electromagnetic brake. It is primarily used in large equipment with high safety requirements, such as mine hoists and elevators. This safety brake significantly increases the braking torque of existing brakes and can be installed on low-speed shafts near the working parts of the equipment to enhance safety performance.

[0003] Patent No. ZL201520085336.2 discloses a high-torque dual-electromagnetic head normally closed safety brake. This brake increases the braking torque by attracting the two electromagnets, thereby improving the safety performance of the brake. However, although two electromagnets are provided, they are located on one side of the brake arm, and the structure is still a single-sided electromagnet structure. During use, when the brake is released, the two brake shoes cannot be simultaneously separated from the brake wheel to release the brake; when the brake is engaged, the two brake pads cannot simultaneously apply force to the brake wheel. This will result in uneven braking force, affecting the braking effect and causing the pad on one side of the brake shoe to wear faster. In addition, during the installation of the electromagnetic brake, it is necessary to adjust the distance between the electromagnet and the brake arm to limit the movable distance of the brake arm when braking. When adjusting the distance of the existing electromagnetic brake, it is necessary to remove the mounting bolts of the electromagnet, move the electromagnet to the specified position, and then fix the mounting bolts. The adjustment process is time-consuming and labor-intensive, which seriously affects the installation speed of the brake. It is necessary to improve it. Summary of the Invention

[0004] The utility model aims to solve the above problems and provide a double-electromagnet electromagnetic drum brake which has a simple structure and is easy to adjust.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A dual-electromagnet electromagnetic drum brake comprises a base, two brake arms are symmetrically arranged on the base and the brake arms are connected to the base pin shaft, a brake shoe is connected to the brake arm, an electromagnet is provided on the relatively distant side of the two brake arms, the bottom ends of the two electromagnets are provided with a support frame and are connected to the base pin shaft through the support frame, and the top ends of the two electromagnets are connected by a pulling adjustment assembly; the pulling adjustment assembly comprises a pulling screw, a first pulling screw sleeve, and a second pulling screw sleeve, the first pulling screw sleeve and the second pulling screw sleeve are respectively arranged corresponding to the two electromagnets, one end of the first pulling screw sleeve and the second pulling screw sleeve is respectively connected to the first connecting ear pin shaft arranged at the top of the corresponding electromagnet, the other end of the first pulling screw sleeve and the second pulling screw sleeve are respectively threadedly connected to the two ends of the pulling screw, and the external threads at the two ends of the pulling screw have opposite rotation directions, so that the first pulling screw sleeve and the second pulling screw sleeve can be made to move relatively close to or relatively away from each other through the rotation operation of the pulling screw.

[0007] Furthermore, the bottom ends of the two brake arms are connected to the base pin shaft, and the top ends of the two brake arms are provided with corresponding reset components and the reset components are connected to the pulling component; the reset component includes a reset spring and a pulling kit; the pulling kit is arranged in a horizontal U-shape, and the relatively far ends of the two pulling kits are open ends and the open ends are respectively connected to the corresponding top pin shafts of the brake arms, and the relatively close ends of the two pulling kits are provided with avoidance holes and are sleeved on the outside of the middle part of the pulling screw through the avoidance holes; the reset spring is located in the pulling kit and is sleeved on the outside of the pulling screw, one end of the reset spring abuts against the inner wall of the pulling kit, and the other end of the reset spring abuts against the positioning nut threadedly connected to the pulling screw.

[0008] Furthermore, both ends of the return spring are embedded with spring seats, and the two spring seats are both sleeved on the outside of the pulling screw and can slide along the pulling screw; one of the spring seats abuts against the inner wall of the pulling kit, and the other spring seat abuts against the positioning nut.

[0009] Furthermore, a second connecting ear is provided on one side of the bottom end of the support frame close to the brake arm, and the second connecting ear and the corresponding bottom end of the brake arm are connected to the base pin shaft through an installation pin shaft.

[0010] Furthermore, a third connecting ear is provided at the bottom end of the support frame, a first threaded hole is provided on the third connecting ear and a supporting bolt is threadedly connected through the first threaded hole, the supporting bolt is longitudinally arranged, and the bottom end of the supporting bolt abuts against the base after passing through the first threaded hole; a supporting nut is threadedly connected to the supporting bolt, and the supporting nut is located at the bottom end of the third connecting ear and contacts the end face of the bottom end of the third connecting ear.

[0011] Furthermore, an adjusting nut is provided for fixing the center position of the pulling screw; the end heads of the pulling screw are respectively threadedly connected to the first pulling screw sleeve and the second pulling screw sleeve, and a limiting nut is provided on the side of the first pulling screw sleeve and the second pulling screw sleeve close to the adjusting nut. The limiting nut is sleeved on the pulling screw and threadedly connected to the pulling screw, and one end face of the limiting nut is in contact with the end face of the first pulling screw sleeve or the second pulling screw sleeve.

[0012] Furthermore, the middle parts of the opposing surfaces of the two brake arms are pin-connected with brake shoes, the opposing surfaces of the two brake shoes are arranged in an arc shape, and an angle adjustment assembly is provided on one side of the bottom end of the two brake shoes; the angle adjustment assembly includes a fourth connecting ear, a second threaded hole is provided on the fourth connecting ear and an adjusting bolt is threadedly connected through the second threaded hole, the adjusting bolt is arranged in an inclined shape, and one end of the adjusting bolt passes through the second threaded hole and abuts against the back side of the bottom end of the corresponding brake shoe; a fastening nut is threadedly connected to the adjusting bolt, and one end face of the fastening nut is in contact with the end face of the fourth connecting ear.

[0013] Furthermore, a touch limit switch is provided on one side of the electromagnet, and a touch piece corresponding to the touch limit switch is provided on the brake arm; when the brake arm moves to a specified position under the adsorption action of the electromagnet, the touch piece contacts the touch limit switch.

[0014] Compared with the prior art, the advantages and positive effects of this utility model are:

[0015] The utility model adopts a design in which two brake arms are symmetrically arranged on a base and electromagnets are symmetrically arranged on the relatively distant sides of the two brake arms, so that the two electromagnets are respectively arranged on one side of the two brake arms. When the two electromagnets are synchronously attracted, one end of the two brake arms simultaneously moves toward the direction of the corresponding electromagnet, so that the two brake shoes installed on the two brake arms are simultaneously away from the brake wheel, thereby achieving a uniform brake release effect. When the brake needs to be engaged, the two electromagnets are simultaneously de-energized. Under the action of the two reset assemblies, the two brake arms simultaneously drive the brake shoes to engage the brake wheel, thereby achieving a uniform braking effect.

[0016] The utility model forms a double-sided electromagnet structure brake by symmetrically arranging electromagnets and reset components on both sides of the brake arm, which can simultaneously brake and release the brake wheel, avoiding uneven braking force and rapid wear of the lining on one side of the brake shoe, thereby improving the braking effect of the brake;

[0017] On the other hand, when adjusting the distance between the two electromagnets and the two brake arms, the utility model only needs to rotate the pulling screw, and then the two electromagnets can be rotated relatively close to or relatively far away around the corresponding mounting pins under the action of the first pulling screw sleeve and the second pulling screw sleeve, thereby achieving the effect of adjusting the distance between the two electromagnets and the two brake arms; the distance adjustment operation is convenient and fast, saving time and effort, and improving the brake assembly rate while ensuring that the distance between the two brake arms and the corresponding electromagnets is the same, thereby effectively ensuring the uniformity of the braking force of the brake, and further improving the use effect of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 This is the main structural diagram of the utility model;

[0020] Figure 2 for Figure 1 AA cross-sectional structural diagram;

[0021] Figure 3 for Figure 1 A magnified view of the local structure;

[0022] Figure 4 It is a left-side structural diagram of the present utility model. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts, any modifications, equivalent replacements, improvements, etc., shall be included in the scope of protection of the present invention.

[0024] like Figures 1 to 4As shown, this embodiment discloses a dual-electromagnet electromagnetic drum brake, comprising a base 1, two brake arms 2 symmetrically provided on the base 1 and pin-connected to the base 1, a brake shoe 5 connected to the brake arm 2, an electromagnet 3 provided on the opposite side of the two brake arms 2, a support frame 4 provided at the bottom end of each of the two electromagnets 3, a second connecting ear 401 provided on the side of the bottom end of the support frame 4 close to the brake arm 2, the second connecting ear 401 and the corresponding bottom end of the brake arm 2 being pin-connected to the base 1 via an installation pin 402, and the top ends of the two electromagnets 3 being connected via a pulling adjustment assembly;

[0025] The pulling adjustment component includes a pulling screw 8, a first pulling screw sleeve 10, and a second pulling screw sleeve 11. The first pulling screw sleeve 10 and the second pulling screw sleeve 11 are respectively arranged corresponding to the two electromagnets 3. One end of the first pulling screw sleeve 10 and the second pulling screw sleeve 11 are respectively pin-connected with the first connecting ear 301 arranged at the top of the corresponding electromagnet 3. The other ends of the first pulling screw sleeve 10 and the second pulling screw sleeve 11 are respectively threadedly connected to the two ends of the pulling screw 8. The external threads at the two ends of the pulling screw 8 rotate in opposite directions, so that the first pulling screw sleeve 10 and the second pulling screw sleeve 11 can be moved relatively close to or relatively away from each other through the rotation operation of the pulling screw 8.

[0026] An adjusting nut 801 is fixedly sleeved at the center position of the pulling screw 8; the end heads of the pulling screw 8 are respectively threadedly connected to the first pulling screw sleeve 10 and the second pulling screw sleeve 11, and a limiting nut 803 is provided on the side of the first pulling screw sleeve 10 and the second pulling screw sleeve 11 close to the adjusting nut 801. The limiting nut 803 is sleeved on the pulling screw 8 and threadedly connected to the pulling screw 8, and one side end faces of the two limiting nuts 803 are respectively in contact with the end faces of the first pulling screw sleeve 10 and the second pulling screw sleeve 11.

[0027] When adjusting the distance between the two electromagnets and the two brake arms, it is only necessary to rotate the pulling screw by adjusting the nut. Under the action of the threads at both ends of the pulling screw, the first pulling screw sleeve and the second pulling screw sleeve will drive the two electromagnets to move relatively closer or relatively farther away around the installation pin shaft, and the pin shaft connection design of the first pulling screw sleeve, the second pulling screw sleeve and the electromagnet can avoid the conflict between the linear movement of the first pulling screw sleeve and the second pulling screw sleeve and the rotational movement of the electromagnet; after the distance adjustment is completed, the limit nut located on one side of the first pulling screw sleeve and the second pulling screw sleeve is tightened and abutted against the first pulling screw sleeve and the second pulling screw sleeve to prevent the pulling screw and the first pulling screw sleeve and the second pulling screw sleeve from rotating on their own during the use of the brake, which affects the distance between the electromagnet and the brake arm, thereby further improving the use effect of the present utility model.

[0028] Each support frame 4 is provided with a third connecting ear 403 on both the front and rear sides of the bottom end, and a first threaded hole is provided on the third connecting ear 403 and a support bolt 6 is threadedly connected through the first threaded hole. The support bolt 6 is arranged longitudinally, and the bottom end of the support bolt 6 abuts against the base 1 after passing through the first threaded hole; a support nut 601 is threadedly connected to the support bolt 6, and the support nut 601 is located at the bottom end of the third connecting ear 403 and contacts the end face of the bottom end of the third connecting ear 403.

[0029] Since the two electromagnets are pulled by the pulling adjustment assembly, after the spacing is adjusted, the pulling screw will be offset toward one of the electromagnets, so that the spacing between one of the electromagnets and the brake arm will be large, and the spacing between the other electromagnet and the brake arm will be small; at this time, the height of the third connecting ear is adjusted by screwing the support bolt so that the height between the third connecting ear at the bottom end of the two support frames and the base is the same. After the adjustment is completed, the support nut is tightened to prevent the support bolt from loosening; at this time, the inclination angles of the two electromagnets can be guaranteed to be consistent, the pulling screw is in a centered state, and the spacing between the two electromagnets and the two brake arms is completely consistent; it effectively avoids the occurrence of offset between the two electromagnets, and further improves the use effect of the present utility model.

[0030] The bottom ends of the two brake arms 2 are pin-connected to the base 1, and the tops of the two brake arms 2 are provided with corresponding reset components and the reset components are connected to the pulling components; the reset component includes a reset spring 9 and a pulling kit 7; the pulling kit 7 is arranged in a horizontal U-shape, and the relatively far ends of the two pulling kits 7 are open ends and the open ends are respectively connected to the corresponding top pins of the brake arms 2, and the relatively close ends of the two pulling kits 7 are provided with avoidance holes 701 and are sleeved on the outside of the middle part of the pulling screw 8 through the avoidance holes 701; the reset spring 9 is located in the pulling kit 7 and sleeved on the outside of the pulling screw 8, one end of the reset spring 9 is embedded with a spring seat 901 and abuts against the inner wall of the pulling kit 7 away from the open end, and the other end of the reset spring 9 is also embedded with a spring seat 901 and abuts against the positioning nut 802 threadedly connected to the pulling screw 8; the two spring seats 901 are both sleeved on the outside of the pulling screw 8 and can slide along the pulling screw 8.

[0031] The brake in the present invention is a long-closed structure with power off. When the electromagnet is energized, the top of the brake arm is attracted, and the brake arm and the brake shoe will move away from the brake wheel. The brake arm will drive the pulling kit to squeeze the reset spring; after the electromagnet is powered off, under the action of the reset spring, the pulling kit and the brake arm will reset, causing the brake shoe to move closer to the brake wheel; the design of the pulling kit being connected to the pin shaft at the top of the brake arm can avoid mutual obstruction between the rotation of the brake arm and the linear sliding movement of the pulling kit along the pulling screw, thereby further improving the use effect of the present invention.

[0032] The middle parts of the opposing surfaces of the two brake arms 2 are pin-connected with brake shoes 5, the opposing surfaces of the two brake shoes 5 are arranged in an arc shape, and an angle adjustment component is arranged on one side of the bottom end of the two brake shoes 5; the angle adjustment component includes a fourth connecting ear 202, and the fourth connecting ear 202 is provided with a second threaded hole and is threadedly connected to an adjusting bolt 12 through the second threaded hole. The adjusting bolt 12 is arranged in an inclined shape, and one end of the adjusting bolt 12 passes through the second threaded hole and abuts against the back side of the bottom end of the corresponding brake shoe 5; a fastening nut 1201 is threadedly connected to the adjusting bolt 12, and one end face of the fastening nut 1201 is in contact with the end face of the fourth connecting ear 202.

[0033] By adjusting the bolt to abut the back of the brake shoe, the angle of the arc surface of the brake shoe can be adjusted, so that the arc surface of the brake shoe is fully adapted to the arc outer wall of the brake wheel. After adjusting the angle of the brake shoe, tighten the fastening nut to prevent the adjusting bolt from loosening.

[0034] A touch limit switch 302 is provided on one side of the electromagnet 3, and a touch member 201 corresponding to the touch limit switch 302 is provided on the brake arm 2; when the brake arm 2 moves to the specified position under the adsorption action of the electromagnet 3, the touch member 201 contacts the touch limit switch 302.

[0035] When the distance between the electromagnet and the brake arm is less than a certain value, the touch limit switch touches the touch piece, which cuts off the power to the electromagnet or reduces the current supplied to the electromagnet, thereby avoiding the attraction and collision between the electromagnet and the brake arm, and further improving the use effect of the utility model.

[0036] The electromagnet described in this technical solution is the entire electromagnet head structure, which includes a power-carrying coil, an iron core, and a shell structure for installing the power-carrying coil and the iron core. The support frame, the first connecting ear, and the touch limit switch are all fixedly installed on its shell structure. The specific structure of the electromagnet and its power-on principle are consistent with the electromagnet structure on the market. It is not an improved technical feature of this technical solution and will not be described in detail.

[0037] The utility model adopts a design in which two brake arms are symmetrically arranged on a base and electromagnets are symmetrically arranged on the relatively distant sides of the two brake arms, so that the two electromagnets are respectively arranged on one side of the two brake arms. When the two electromagnets are synchronously attracted, one end of the two brake arms simultaneously moves toward the direction of the corresponding electromagnet, so that the two brake shoes installed on the two brake arms are simultaneously away from the brake wheel, thereby achieving a uniform brake release effect. When the brake needs to be engaged, the two electromagnets are simultaneously de-energized. Under the action of the two reset assemblies, the two brake arms simultaneously drive the brake shoes to engage the brake wheel, thereby achieving a uniform braking effect.

[0038] The utility model forms a double-sided electromagnet structure brake by symmetrically arranging electromagnets and reset components on both sides of the brake arm, which can simultaneously brake and release the brake wheel, avoiding uneven braking force and rapid wear of the lining on one side of the brake shoe, thereby improving the braking effect of the brake;

[0039] On the other hand, when adjusting the distance between the two electromagnets and the two brake arms, the utility model only needs to rotate the pulling screw, and then the two electromagnets can be rotated relatively close to or relatively far away around the corresponding mounting pins under the action of the first pulling screw sleeve and the second pulling screw sleeve, thereby achieving the effect of adjusting the distance between the two electromagnets and the two brake arms; the distance adjustment operation is convenient and fast, saving time and effort, and improving the brake assembly rate while ensuring that the distance between the two brake arms and the corresponding electromagnets is the same, thereby effectively ensuring the uniformity of the braking force of the brake, and further improving the use effect of the utility model.

Claims

1. A dual-electromagnet electromagnetic drum brake, comprising a base, two brake arms symmetrically disposed on the base and connected to the base with a pin, and brake shoes connected to the brake arms, characterized in that: The two brake arms are each provided with an electromagnet on the relatively distant side, the two electromagnets are each provided with a support frame at the bottom end and are connected to the base pin shaft through the support frame, and the top ends of the two electromagnets are connected by a pulling adjustment assembly; the pulling adjustment assembly includes a pulling screw, a first pulling screw sleeve, and a second pulling screw sleeve, the first pulling screw sleeve and the second pulling screw sleeve are respectively provided corresponding to the two electromagnets, one end of the first pulling screw sleeve and the second pulling screw sleeve are respectively connected to the first connecting ear pin shaft provided at the top end of the corresponding electromagnet, and the other ends of the first pulling screw sleeve and the second pulling screw sleeve are respectively threadedly connected to the two ends of the pulling screw, and the external threads at the two ends of the pulling screw rotate in opposite directions, so that the first pulling screw sleeve and the second pulling screw sleeve can be made to move relatively close to or relatively away from each other through the rotation operation of the pulling screw.

2. The dual-electromagnet electromagnetic drum brake according to claim 1, wherein: The bottom ends of the two brake arms are connected to the base pin shafts, and the top ends of the two brake arms are provided with corresponding reset components and the reset components are connected to the pulling component; the reset component includes a reset spring and a pulling kit; the pulling kit is arranged in a horizontal U-shape, and the relatively far ends of the two pulling kits are open ends and the open ends are respectively connected to the corresponding top pin shafts of the brake arms, and the relatively close ends of the two pulling kits are provided with avoidance holes and are sleeved on the outside of the middle part of the pulling screw through the avoidance holes; the reset spring is located in the pulling kit and is sleeved on the outside of the pulling screw, one end of the reset spring abuts against the inner wall of the pulling kit, and the other end of the reset spring abuts against the positioning nut threadedly connected to the pulling screw.

3. The dual-electromagnet electromagnetic drum brake according to claim 2, wherein: Both ends of the return spring are embedded with spring seats, and the two spring seats are both sleeved on the outside of the pulling screw and can slide along the pulling screw; one of the spring seats abuts against the inner wall of the pulling kit, and the other spring seat abuts against the positioning nut.

4. The dual-electromagnet electromagnetic drum brake according to claim 1, wherein: A second connecting ear is provided on one side of the bottom end of the support frame close to the brake arm, and the second connecting ear and the corresponding bottom end of the brake arm are connected to the base pin shaft through an installation pin shaft.

5. The dual-electromagnet electromagnetic drum brake according to claim 1, wherein: A third connecting ear is provided at the bottom end of the support frame, a first threaded hole is provided on the third connecting ear and a supporting bolt is threadedly connected through the first threaded hole, the supporting bolt is longitudinally arranged, and the bottom end of the supporting bolt abuts against the base after passing through the first threaded hole; a supporting nut is threadedly connected to the supporting bolt, and the supporting nut is located at the bottom end of the third connecting ear and contacts the end face of the bottom end of the third connecting ear.

6. The dual-electromagnet electromagnetic drum brake according to claim 1, wherein: The center position fixing sleeve of the pulling screw is provided with an adjusting nut; the end heads of the pulling screw are respectively threadedly connected with the first pulling screw sleeve and the second pulling screw sleeve, and the first pulling screw sleeve and the second pulling screw sleeve are both provided with a limiting nut on one side close to the adjusting nut. The limiting nut is sleeved on the pulling screw and threadedly connected to the pulling screw, and one end face of the limiting nut is in contact with the end face of the first pulling screw sleeve or the second pulling screw sleeve.

7. The dual-electromagnet electromagnetic drum brake according to claim 1, wherein: The middle parts of the opposing surfaces of the two brake arms are pin-connected with brake shoes, the opposing surfaces of the two brake shoes are arranged in an arc shape, and an angle adjustment assembly is arranged on one side of the bottom end of the two brake shoes; the angle adjustment assembly includes a fourth connecting ear, a second threaded hole is provided on the fourth connecting ear and an adjusting bolt is threadedly connected through the second threaded hole, the adjusting bolt is arranged in an inclined shape, and one end of the adjusting bolt passes through the second threaded hole and abuts against the back side of the bottom end of the corresponding brake shoe; a fastening nut is threadedly connected to the adjusting bolt, and one end face of the fastening nut is in contact with the end face of the fourth connecting ear.

8. The dual-electromagnet electromagnetic drum brake according to claim 1, wherein: A touch limit switch is provided on one side of the electromagnet, and a touch piece corresponding to the touch limit switch is provided on the brake arm; when the brake arm moves to a specified position under the adsorption action of the electromagnet, the touch piece contacts the touch limit switch.

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