A magnetic yoke structure and an electromagnetic brake capable of precisely adjusting torque

Abstract

The utility model relates to the technical field of brake, provide a kind of magnetic yoke structure and the electromagnetic brake of precise torque regulation, magnetic yoke structure includes magnetic yoke body, the adsorption surface of magnetic yoke body is equipped with the annular groove for installing coil, one or more installation notches that pass through adsorption surface are equipped with outside the magnetic yoke body, the outer magnet that can complete installation notch is detachably connected in installation notch, outer magnet end surface is equipped with spring hole for installing pressurized spring.The utility model can realize adjusting total spring force by increasing or decreasing outer magnet and the spring installed on it, so as to realize the regulation of brake torque;In practical application, the number of spring and the relationship of brake torque can be marked on the corresponding outer magnet or brake nameplate, to ensure accurate adjustment and avoid misoperation.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, and more specifically, to a magnetic yoke structure and an electromagnetic brake with precisely adjustable torque. Background Technology

[0002] Electromagnetic brakes, also known as electromagnetic brakes or electromagnetic gates, are widely used in various industries. They are mechanical devices that use electromagnetic force to achieve braking or releasing the brake. Electromagnetic brakes typically come in two types: de-energized braking and energized braking. A de-energized brake applies pressure to a moving plate via a spring when the power is off, causing the plate to press against the rotor to achieve braking; the brake is released when the power is applied. An energized electromagnetic brake applies braking when the coil is energized and releases the brake when the power is off.

[0003] For power failure brakes, most torque-adjustable power failure brakes currently achieve torque increase or decrease by adjusting the spring force. However, this method has the following drawbacks: If the operator is unfamiliar with the brake or there is no operating guide, it is easy to accidentally adjust the spring to either compress or overtravel. Compressing will cause the brake to fail to work, while overtravel will cause the brake to fail to engage when it overheats. Compared to compressing, overtravel is more dangerous because compressing will cause the brake to fail to open and work from the very beginning, so the operator will look for the cause to solve the problem. However, overtravel may work normally at first, but after working for a period of time, the brake will fail to open or will be in a partially open state. At this time, the brake will work under load, which will cause abnormal friction in the whole machine, eventually causing the brake or motor to burn out. Utility Model Content

[0004] The purpose of this invention is to provide a magnetic yoke structure and an electromagnetic brake with precisely adjustable torque to overcome the aforementioned deficiencies in the prior art.

[0005] This utility model is achieved through the following technical solution: A magnetic yoke structure includes a magnetic yoke body, an adsorption surface of the magnetic yoke body having an annular groove for mounting a coil, one or more mounting notches penetrating the adsorption surface on the outer side of the magnetic yoke body, an outer magnet detachably connected to the mounting notch to fill the mounting notch, and a spring hole for mounting a pressure spring on the end face of the outer magnet.

[0006] Optionally, the end of the mounting notch away from the magnetic yoke body's adsorption surface is closed, and the closed end of the mounting notch is connected to the external magnet by screws.

[0007] Optionally, when the magnetic yoke body has multiple mounting notches on its outer side, the size of each mounting notch is the same.

[0008] Optionally, when the outer side of the magnetic yoke body is provided with multiple mounting notches, the size of the mounting notches has at least two specifications.

[0009] This utility model also provides an electromagnetic brake with precisely adjustable torque, including the magnetic yoke structure described in any one of the above, and further including a moving plate, a rotor and a flange arranged sequentially along the direction away from the adsorption surface of the magnetic yoke body, with the flange fixedly connected to the magnetic yoke body.

[0010] Optionally, the flange and the magnetic yoke body are connected by connecting screws, and the connecting screws are fitted with positioning sleeves for limiting the distance between the flange and the magnetic yoke body. The moving plate is provided with positioning ports that cooperate with the positioning sleeves.

[0011] Optionally, mounting screws are inserted through the flange, the movable plate is provided with a clearance hole to avoid the head of the mounting screws, and the magnetic yoke body is provided with an operating hole for a screwing tool to be inserted.

[0012] Optionally, a dust cover is provided between the flange and the magnetic yoke body to seal the gap between them.

[0013] The technical solution of this utility model has at least the following advantages and beneficial effects: In this utility model, the outer magnet is detachably connected to the mounting notch on the outside of the magnetic yoke body, and a spring is installed in the spring hole of the outer magnet. By adding or removing the outer magnet (and the spring installed on it), the total spring force can be adjusted (it is easy to understand that adding an outer magnet can increase the magnetic field force by more than the pressing force of the spring on the outer magnet on the moving plate, ensuring that it does not affect the unlocking of the brake), thereby realizing the adjustment of the braking torque; in practical applications, the relationship between the number of springs added and the braking torque can be marked on the corresponding outer magnet or the brake nameplate to ensure accurate adjustment (avoiding misoperation). Attached Figure Description

[0014] Figure 1 A schematic diagram of a magnetic yoke structure provided by this utility model; Figure 2 This is a schematic diagram of the magnetic yoke body. Figure 3 A front view of an electromagnetic brake with precisely adjustable torque; Figure 4 for Figure 3 AA section view in the middle; Reference numerals: 1-Magnetic yoke body, 101-Mounting notch, 102-Ring groove, 103-Operating hole, 2-Outer magnet, 3-Spring, 4-Moving plate, 401-Allowing hole, 5-Rotor, 6-Flange, 7-Connecting screw, 8-Positioning sleeve, 9-Mounting screw, 10-Dust cover. Detailed Implementation

[0015] refer to Figure 1 and Figure 2A magnetic yoke structure includes a magnetic yoke body 1. The magnetic yoke body 1 has an annular groove 102 on its adsorption surface for mounting a coil. In this embodiment, the magnetic yoke body 1 has multiple mounting notches 101 penetrating the adsorption surface on its outer side. The specific shape of the mounting notches 101 is not limited; they can be square, semi-cylindrical, or other shapes. An outer magnet 2, capable of filling the mounting notch 101, is detachably connected within the mounting notch 101. The end face of the outer magnet 2 has a spring hole 3 for mounting a pressure spring 3.

[0016] In use, the total force of the springs 3 can be adjusted by adding or removing the outer magnets 2 (and the springs 3 mounted on them). (It is easy to understand that adding an outer magnet 2 increases the magnetic field force by more than the clamping force of the springs 3 on the moving plate 4, ensuring that the unlocking of the brake is not affected.) This allows for adjustment of the braking torque. In practical applications, the relationship between the number of springs 3 and the braking torque can be noted on the corresponding outer magnet 2 or on the brake nameplate to ensure precise adjustment (avoiding misoperation). In other embodiments, the magnetic yoke body 1 may also involve only one mounting notch 101. In this case, the mounting notch 101 may occupy a part of the circumference or the entire circumference (i.e., it is ring-shaped).

[0017] Those skilled in the art should understand that, in practical applications, the magnetic yoke body 1 also has spring 3 holes for installing the pressure spring 3. The spring 3 force provided by the spring 3 installed on the magnetic yoke body 1 can apply pressure to the moving plate 4 to achieve the braking requirement without the installation of the external magnet 2. At the same time, when the external magnet 2 is not installed, the magnetic field force generated by the coil being energized can overcome the sum of the spring 3 forces provided by the spring 3 installed on the magnetic yoke body 1, ensuring that the brake can be unlocked normally.

[0018] As an alternative, the end of the mounting notch 101 away from the adsorption surface of the yoke body 1 is closed. The closed end of the mounting notch 101 is connected to the outer magnet 2 by screws. That is, a through hole is provided at the closed end of the mounting notch 101, and a threaded hole is provided at the corresponding position on the outer magnet 2. The screw passes through the through hole on the mounting notch 101 and connects to the threaded hole on the outer magnet 2. The corresponding outer magnet 2 can be removed by removing the screw without disassembling the entire brake. In other embodiments, if the radial dimension of the yoke body 1 allows, radially arranged screws can also be used to connect the outer magnet 2 to the yoke body 1. In other embodiments, the outer magnet 2 can also be detachably connected in other ways, such as the outer magnet 2 being connected to the safety notch closure by a locating pin. This method requires disassembling the brake to detach the outer magnet 2.

[0019] In this embodiment, the mounting notches 101 are divided into two sizes, one large and one small. The larger outer magnet 2 can be equipped with two springs 3 (or more), while the smaller outer magnet 2 is equipped with one spring 3. Each size can be further divided into multiple sizes; for example, in this embodiment, three outer magnets 2 of each size are provided. It should be understood that the size of the outer magnet 2 is determined by the number of springs 3 provided on it, ensuring that the increased magnetic field force is greater than the clamping force of the springs 3 on the outer magnet 2 on the moving plate 4, thus guaranteeing that the brake can unlock normally after the addition of the outer magnet 2. In other embodiments, the mounting notches 101 can be further subdivided into more sizes, from small to large, with more springs 3 provided on each size. In other embodiments, the size of each mounting notch 101 can also be the same.

[0020] refer to Figure 3 and Figure 4 This embodiment also provides an electromagnetic brake with precisely adjustable torque, including the above-mentioned magnetic yoke structure, and further including a moving plate 4, a rotor 5 and a flange 6 arranged sequentially along the direction away from the adsorption surface of the magnetic yoke body 1, with the flange 6 fixedly connected to the magnetic yoke body 1.

[0021] In this embodiment, flange 6 and magnetic yoke body 1 are connected by connecting screws 7. A positioning sleeve 8 is fitted on the connecting screw 7. One end of the positioning sleeve 8 abuts against the magnetic yoke body 1, and the other end of the positioning sleeve 8 abuts against flange 6. This is used to limit the (axial) distance between flange 6 and magnetic yoke body 1, so as to ensure the working clearance of moving plate 4. Moving plate 4 is provided with a positioning port that cooperates with positioning sleeve 8. As an option, in this embodiment, the positioning port is a through hole. The positioning serves as both radial positioning of moving plate 4 and motion guide for moving plate 4.

[0022] A mounting screw 9 is inserted through the flange 6 to facilitate the connection and fixation of the brake to the mounting surface. The head of the mounting screw 9 is located between the flange 6 and the magnetic yoke body 1. The moving plate 4 is provided with a clearance hole 401 to avoid the head of the mounting screw 9. It is easy to understand that the diameter of the clearance hole 401 is larger than the diameter of the head of the mounting screw 9. Furthermore, the magnetic yoke body 1 is provided with an operating hole 103 to facilitate the tightening of the mounting screw 9 by inserting a screw-in tool (such as a screwdriver, hex wrench, etc.).

[0023] A dust cover 10 is provided between the flange 6 and the magnetic yoke body 1 to seal the gap between them and provide dust protection. Alternatively, the dust cover 10 can be installed as follows: both ends of the dust cover 10 have annular locking blocks, and the outer sides of the flange 6 and the magnetic yoke body 1 have annular grooves that mate with the locking blocks. As is easily understood, the dust cover 10 is typically made of plastic and has a certain degree of elasticity; installation is achieved by simply engaging the annular locking blocks of the dust cover 10 into the annular grooves. In other embodiments, the dust cover 10 can also be installed in other ways, such as by fastening it to the flange 6 and the magnetic yoke with screws.

[0024] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A magnetic yoke structure, comprising a magnetic yoke body, characterized in that, The magnetic yoke body has an adsorption surface with an annular groove for mounting a coil. The outer side of the magnetic yoke body has one or more mounting notches that penetrate the adsorption surface. An external magnet that can fill the mounting notch is detachably connected inside the mounting notch. The end face of the external magnet has a spring hole for mounting a pressure spring.

2. The magnetic yoke structure according to claim 1, characterized in that, The end of the mounting notch away from the magnetic yoke body's adsorption surface is closed, and the closed end of the mounting notch is connected to the external magnet by screws.

3. The magnetic yoke structure according to claim 1, characterized in that, When the magnetic yoke body has multiple mounting notches on its outer side, all mounting notches are the same size.

4. The magnetic yoke structure according to claim 1, characterized in that, When the outer side of the magnetic yoke body is provided with multiple mounting notches, the size of the mounting notches has at least two specifications.

5. An electromagnetic brake with precisely adjustable torque, comprising the magnetic yoke structure as described in any one of claims 1-4, characterized in that, It also includes a moving plate, a rotor, and a flange arranged sequentially along the direction away from the adsorption surface of the magnetic yoke body, with the flange being fixedly connected to the magnetic yoke body.

6. The electromagnetic brake with precisely adjustable torque according to claim 5, characterized in that, The flange and the magnetic yoke body are connected by connecting screws. The connecting screws are fitted with positioning sleeves to limit the distance between the flange and the magnetic yoke body. The moving plate is provided with positioning ports that cooperate with the positioning sleeves.

7. The electromagnetic brake with precisely adjustable torque according to claim 5, characterized in that, The flange is fitted with mounting screws, the movable plate is provided with clearance holes to avoid the heads of the mounting screws, and the magnetic yoke body is provided with operating holes for screwing tools to be inserted.

8. The electromagnetic brake with precisely adjustable torque according to claim 5, characterized in that, A dust cover is provided between the flange and the magnetic yoke body to seal the gap between them.

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