Torque-adjustable electromagnetic brake

Abstract

The utility model discloses a torque adjustable electromagnetic brake which comprises a magnet yoke, an electromagnetic coil, reset compression springs, an armature, a brake disc, a cover plate and an adjusting stud, a plurality of compression spring blind holes and a plurality of compression spring through holes are formed in the magnet yoke, and a plurality of fixed reset compression springs are installed in the compression spring blind holes respectively. The adjustable reset compression springs are installed in the compression spring through holes respectively, internal threads are arranged on the hole walls of the middle sections of the compression spring through holes, the adjusting studs are installed in the compression spring through holes respectively and connected with the compression spring through holes in a threaded mode, and the adjustable reset compression springs are located between the corresponding adjusting studs and the armature. On the premise of not replacing parts, not increasing the use cost and not influencing the production schedule, the brake torque adjusting function is achieved, the problem that the torque is reduced due to the fact that the elastic force of a reset compression spring is reduced after long-term use can be solved, the problem that the brake torque needs to be changed due to application scene changes can also be solved, and the brake torque adjusting function is achieved. And the application range of the electromagnetic brake is wider.

Description

Technical Field

[0001] The utility model relates to an electromagnetic brake, in particular to a torque-adjustable electromagnetic brake. Background Art

[0002] With the continuous improvement of industrial automation, the demand for various automation equipment is also increasing, and the demand for electromagnetic brakes is also increasing. Electromagnetic brakes can be used not only in traditional machinery manufacturing, machine tool processing and other industries, but also in emerging electronics, new energy and other industries. Their performance and reliability directly affect the operation effect of the equipment.

[0003] The basic structure of a traditional electromagnetic brake includes a yoke, an electromagnetic coil, a return compression spring, an armature, a brake disc and a cover plate. The electromagnetic coil is installed in the annular hole of the yoke and close to the armature. Multiple return compression springs are respectively installed in multiple compression spring blind holes evenly distributed along the circumferential direction on the yoke and close to the armature. Multiple connecting bolts pass through the yoke and the armature in turn and are connected to the cover plate. The brake disc is located between the armature and the cover plate. Friction plates are respectively provided on both side surfaces of the brake disc. The wall of the central through hole of the brake disc is provided with transmission teeth for circumferential transmission connection with the rotating shaft and capable of relative axial movement. Its basic working principle is: when the electromagnetic coil is energized, the yoke generates electromagnetic attraction to the armature and adsorbs it to the end face of the yoke, the gap between the armature and the cover plate increases, and the brake disc can rotate freely. At this time, the brake is released and the shaft of the equipment can rotate freely; when the electromagnetic coil is de-energized, the electromagnetic attraction of the yoke to the armature disappears, and the armature moves toward the cover plate under the action of the reset compression spring, pressing the brake disc against the cover plate, and the friction plate brakes against the cover plate and the armature respectively. The brake disc and the equipment shaft cannot continue to rotate, thus realizing the braking function.

[0004] The above-mentioned traditional electromagnetic brake has the following defects: the elastic force of the reset spring is an important factor in determining the braking torque of the electromagnetic brake, and the elastic force of each reset spring is fixed (Note: the reduction in the elastic force of the reset spring after a period of use is determined by its own characteristics and is not within the controllable range of change discussed in this application). During the use of the product, if a different reset spring is not replaced and other factors affecting the torque remain unchanged, the braking torque of the electromagnetic brake cannot be changed by adjustment. It can neither solve the problem of torque reduction due to the reduction in the elastic force of the reset spring after long-term use, nor solve the problem of changing the braking torque due to changes in application scenarios, resulting in the application of electromagnetic brakes being limited. Although the torque can be changed by replacing parts, it will increase the cost of use and may affect the production schedule. Utility Model Content

[0005] The purpose of the utility model is to provide a torque-adjustable electromagnetic brake in order to solve the above-mentioned problem.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] A torque-adjustable electromagnetic brake comprises a yoke, an electromagnetic coil, a reset spring, an armature, a brake disc and a cover plate, wherein the electromagnetic coil and a plurality of the reset springs are respectively installed in the yoke, a plurality of connecting bolts are respectively passed through the yoke and the armature in sequence and are connected to the cover plate, the brake disc is located between the armature and the cover plate, the torque-adjustable electromagnetic brake also comprises an adjusting stud, a plurality of compression spring blind holes and a plurality of compression spring through holes which are axially parallel to each other are arranged in the yoke, a plurality of the compression spring blind holes are evenly distributed around a first virtual perfect circle, a plurality of the compression spring through holes are evenly distributed around a second virtual perfect circle, the first virtual perfect circle and the second virtual perfect circle have the same center but different diameters, the reset spring comprises a fixed reset spring and an adjustable reset spring, A plurality of fixed return compression springs are respectively installed in a plurality of corresponding compression spring blind holes, a plurality of adjustable return compression springs are respectively installed in a plurality of corresponding compression spring through holes, a middle hole wall of the compression spring through hole is provided with an internal thread, a plurality of adjusting studs are respectively installed in a plurality of corresponding compression spring through holes and are threadedly connected and respectively support one end of the corresponding adjustable return compression spring, and the adjustable return compression spring is located between the corresponding adjusting stud and the armature; when the adjusting stud is screwed into the corresponding compression spring through hole to the limit position, the elastic force of the adjustable return compression spring is greater than the elastic force of the fixed return compression spring, and when the adjusting stud is screwed out of the corresponding compression spring through hole to the limit position, the elastic force of the adjustable return compression spring is less than the elastic force of the fixed return compression spring.

[0008] Preferably, in order to facilitate the rotation of the adjusting stud and to understand the rotation angle of the adjusting stud in real time to achieve a more precise adjustment function, a hexagonal hole is provided at the center position of the end face of the adjusting stud away from the armature, and a reference position mark is provided near the edge of the end face of the adjusting stud away from the armature, and a plurality of circumferential scale lines evenly distributed along a perfect circle are respectively provided on the surface of the side of the yoke away from the armature and located at the outer periphery of the plurality of compression spring through holes, one of the circumferential scale lines corresponding to each of the adjusting studs is a thickened and / or lengthened and / or discolored reference line, and the reference position mark on each of the adjusting studs is aligned with the corresponding reference line.

[0009] Preferably, in order to more intuitively perform synchronous adjustment on a plurality of adjusting screws, the plurality of reference lines are parallel to each other and are located on the same side of the corresponding adjusting screws.

[0010] Preferably, in order to cooperate with the circumferential scale lines to further improve the adjustment accuracy, or to understand the real-time rotation angle of the adjustment stud in another way, a section of the circumferential hole wall in the compression spring through hole away from the armature has no internal thread and is provided with a plurality of axial scale lines, and the plurality of axial scale lines are arranged in sequence in the axial direction of the compression spring through hole and are perpendicular to the axial direction of the compression spring through hole.

[0011] Preferably, in order to achieve a balanced adjustment function, the number of the compression spring through holes and the number of the adjustment studs are four.

[0012] Preferably, in order to facilitate assembly and operation, the diameter of the first virtual perfect circle is greater than the diameter of the second virtual perfect circle.

[0013] The beneficial effects of the utility model are:

[0014] The utility model adds multiple adjustable reset compression springs and multiple adjusting studs in the magnetic yoke, and the multiple adjusting studs can be rotated to tighten or loosen the corresponding adjustable reset compression springs, thereby changing the elastic force of the adjustable reset compression springs. This realizes the adjustment function of the braking torque without replacing parts, increasing the use cost, and affecting the production progress. It can solve the problem of torque reduction due to reduced elastic force of the reset compression spring after long-term use, and can also solve the problem of changing the braking torque due to changes in application scenarios, thereby making the application range of the electromagnetic brake wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main structure of the torque-adjustable electromagnetic brake of the utility model;

[0016] Figure 2 yes Figure 1 Enlarged view of "B" in the figure;

[0017] Figure 3 yes Figure 1 AA section view in;

[0018] Figure 4 yes Figure 3 Enlarged view of "C" in Figure 2. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings:

[0020] like Figure 1-Figure 4As shown, the torque-adjustable electromagnetic brake of the utility model includes a yoke 1, an electromagnetic coil 12, a reset compression spring, an armature 11, a brake disc 9, a cover plate 8 and an adjusting stud 3, the electromagnetic coil 12 and a plurality of the reset compression springs are respectively installed in the yoke 1, a plurality of connecting bolts 2 are respectively passed through the yoke 1 and the armature 11 in sequence and are connected to the cover plate 8, the brake disc 9 is located between the armature 11 and the cover plate 8, a plurality of compression spring blind holes (not marked in the figure) and a plurality of compression spring through holes (not marked in the figure) which are axially parallel to each other are provided in the yoke 1, a plurality of the compression spring blind holes are evenly distributed around a first virtual perfect circle, a plurality of the compression spring through holes are evenly distributed around a second virtual perfect circle, the first virtual perfect circle and the second virtual perfect circle have the same center but different diameters, the reset compression spring includes a fixed reset compression spring 15 and an adjustable reset compression spring 13, a plurality of fixed reset compression springs 15 are respectively Installed in a plurality of the compression spring blind holes corresponding to each other, a plurality of adjustable reset compression springs 13 are respectively installed in a plurality of the compression spring through holes corresponding to each other, the middle hole wall of the compression spring through hole is provided with an internal thread, a plurality of adjusting studs 3 are respectively installed in a plurality of the compression spring through holes corresponding to each other and are threadedly connected and respectively support one end of the corresponding adjustable reset compression spring 13, and the adjustable reset compression spring 13 is located between the corresponding adjusting stud 2 and the armature 11; when the adjusting stud 3 is screwed into the corresponding compression spring through hole to the limit position (the limit position is determined by the structure designed according to the preset value), the elastic force of the adjustable reset compression spring 13 is greater than the elastic force of the fixed reset compression spring 15, and when the adjusting stud 3 is screwed out of the corresponding compression spring through hole to the limit position (the limit position is determined by the structure designed according to the preset value), the elastic force of the adjustable reset compression spring 13 is less than the elastic force of the fixed reset compression spring 15.

[0021] like Figure 1-Figure 4 As shown, the utility model also discloses the following more optimized specific structures:

[0022] In order to facilitate the rotation of the adjusting stud 3 and to understand the rotation angle of the adjusting stud 3 in real time to achieve a more precise adjustment function, a hexagonal hole 4 is provided at the center position of the end face of the adjusting stud 3 away from the armature 11, and a reference position mark 5 (a triangular mark in the figure and its vertex is aligned with the reference line 7) is provided near the edge of the end face of the adjusting stud 3 away from the armature 11. A plurality of circumferential scale lines 6 uniformly distributed along a perfect circle are provided on the surface of the side away from the armature 11 of the yoke 1 at the positions located on the outer periphery of the plurality of compression spring through holes, and one of the circumferential scale lines 6 corresponding to each adjusting stud 3 is thickened or / and lengthened or / and discolored ( Figure 1 The reference line 7 (in bold and lengthened) is aligned with the corresponding reference line 7 on each adjusting stud 3.

[0023] In order to more intuitively perform synchronous adjustment on the multiple adjustment screws 3 , the multiple reference lines 7 are parallel to each other and are located on the same side of the corresponding adjustment screws 3 .

[0024] In order to cooperate with the circumferential scale lines 6 to further improve the adjustment accuracy, or to understand the real-time rotation angle of the adjustment stud 3 in another way, a section of the circumferential hole wall 14 in the compression spring through hole away from the armature 11 has no internal thread and is provided with a plurality of axial scale lines 16, and the plurality of axial scale lines 16 are arranged in sequence in the axial direction of the compression spring through hole and are perpendicular to the axial direction of the compression spring through hole.

[0025] In order to achieve the balanced adjustment function, there are four compression spring through holes and four adjustment studs 3 .

[0026] To facilitate assembly and operation, the diameter of the first virtual perfect circle is greater than the diameter of the second virtual perfect circle.

[0027] Figure 3 Also shown is the transmission tooth 10 on the wall of the central through hole of the brake disc 9, which is used for circumferential transmission connection with the rotating shaft of the device and can move relative to the axial direction. This is a conventional structure.

[0028] like Figure 1-Figure 4 As shown, when used, if the braking torque corresponding to the elastic force of the fixed reset compression spring 15 meets the application requirements, the multiple adjusting studs 3 are rotated to move it away from the armature 11 to the extreme position, so that the elastic force of the adjustable reset compression spring 13 is smaller than the elastic force of the fixed reset compression spring 15. At this time, the adjustable reset compression spring 113 does not exert elastic pressure on the armature 11, and has the same function as a traditional electromagnetic brake.

[0029] If the braking torque corresponding to the elastic force of the fixed return compression spring 15 is too small to meet the application requirements (it is possible that the fixed return compression spring 15 has been used for too long, causing the elastic force to decrease, resulting in a decrease in the braking torque, or the application scenario has changed, resulting in a decrease in the braking torque), then the multiple adjusting studs 3 are rotated in the opposite direction to move them to a suitable position in the direction close to the armature 11. The suitable position is determined according to the actual required braking torque. The corresponding relationship between the rotation angle of the adjusting stud 3 (the angle can be greater than 360°, that is, it can be greater than one circle) and the suitable position can be obtained based on a limited number of tests. The actual rotation angle of the adjusting stud 3 is the actual rotation angle between the reference line 7 and the reference position mark 5, which can be determined by the number of rotation circles and the circumferential scale line 6, or determined in conjunction with the corresponding relationship between the end face of the adjusting stud 3 and the axial scale line 16, or determined solely by the corresponding relationship between the end face of the adjusting stud 3 and the axial scale line 16; after the adjustment is completed, the elastic force of the adjustable return compression spring 13 is greater than the elastic force of the fixed return compression spring 15 and just meets the application requirements.

[0030] By the same token, if a larger or smaller braking torque is required according to the application scenario, the above operation can be repeated, or the rotation direction of the adjustment stud 3 can be changed during the operation, so that the braking torque can be increased or decreased to ultimately meet the application requirements.

[0031] The working principle of the entire electromagnetic brake is the same as the background technology content, which will not be repeated here.

[0032] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A torque-adjustable electromagnetic brake, comprising a yoke, an electromagnetic coil, a return spring, an armature, a brake disc and a cover plate, wherein the electromagnetic coil and a plurality of the return springs are respectively installed in the yoke, a plurality of connecting bolts respectively pass through the yoke and the armature in sequence and are connected to the cover plate, and the brake disc is located between the armature and the cover plate, characterized in that: The torque-adjustable electromagnetic brake also includes an adjusting stud. A plurality of compression spring blind holes and a plurality of compression spring through holes are axially parallel to each other in the magnetic yoke. The plurality of compression spring blind holes are evenly distributed around a first virtual perfect circle. The plurality of compression spring through holes are evenly distributed around a second virtual perfect circle. The first virtual perfect circle and the second virtual perfect circle have the same center but different diameters. The reset compression spring includes a fixed reset compression spring and an adjustable reset compression spring. The plurality of fixed reset compression springs are respectively installed in the plurality of compression spring blind holes corresponding to each other. The plurality of adjustable reset compression springs are respectively installed in the plurality of compression spring through holes corresponding to each other. In the hole, the middle section of the hole wall of the compression spring through hole is provided with an internal thread, and the multiple adjusting studs are respectively installed in the multiple corresponding compression spring through holes and are threadedly connected and respectively support one end of the corresponding adjustable reset compression spring, and the adjustable reset compression spring is located between the corresponding adjusting stud and the armature; when the adjusting stud is screwed into the corresponding compression spring through hole to the limit position, the elastic force of the adjustable reset compression spring is greater than the elastic force of the fixed reset compression spring, and when the adjusting stud is screwed out of the corresponding compression spring through hole to the limit position, the elastic force of the adjustable reset compression spring is less than the elastic force of the fixed reset compression spring.

2. The torque-adjustable electromagnetic brake according to claim 1, characterized in that: A hexagonal hole is provided at the center position of the end face of the adjusting stud away from the armature, a reference position mark is provided at a position close to the edge of the end face of the adjusting stud away from the armature, and a plurality of circumferential scale lines evenly distributed along a perfect circle are provided on the surface of the side of the yoke away from the armature and located at the outer periphery of the plurality of compression spring through holes, one of the circumferential scale lines corresponding to each of the adjusting studs is a thickened and / or lengthened and / or discolored reference line, and the reference position mark on each of the adjusting studs is aligned with the corresponding reference line.

3. The torque-adjustable electromagnetic brake according to claim 2 is characterized in that: The plurality of reference lines are parallel to each other and are located on the same side of the corresponding adjusting screws.

4. The torque-adjustable electromagnetic brake according to any one of claims 1 to 3, characterized in that: A section of the circumferential hole wall in the compression spring through hole away from the armature has no internal thread and is provided with a plurality of axial scale lines, which are arranged in sequence in the axial direction of the compression spring through hole and are perpendicular to the axial direction of the compression spring through hole.

5. The torque-adjustable electromagnetic brake according to any one of claims 1 to 3, characterized in that: There are four compression spring through holes and four adjusting studs.

6. The torque-adjustable electromagnetic brake according to any one of claims 1 to 3, characterized in that: The diameter of the first virtual perfect circle is greater than the diameter of the second virtual perfect circle.

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