Electromagnetic brake

Abstract

The utility model discloses an electromagnetic brake, which relates to the technical field of electromagnetic brakes and comprises a shell, a brake assembly and a distance measuring assembly, the brake assembly comprises a brake disc, a first friction disc, an armature disc, an elastic piece and an armature, the first friction disc is arranged on one side of the brake disc facing the shell, one end of the elastic piece is connected with the shell, and the other end of the elastic piece is connected with the shell. The other end of the elastic piece is connected with the armature disc, the armature disc can abut against the first friction disc, and the armature is installed on the shell and used for attracting the armature disc; the distance measuring assembly comprises a distance measuring part and a collector, the distance measuring part is in signal connection with the collector, and the distance measuring part is installed on the shell and used for detecting the distance between the distance measuring part and the armature disc. Through the arrangement of the distance measuring assembly, the distance between the distance measuring assembly and the armature disc is detected in real time, and therefore real-time monitoring of the air gap value is achieved, the numerical value obtained through conversion after current or voltage value measurement is more accurate compared with the numerical value obtained through conversion after current or voltage value measurement, and accurate detection of the air gap can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic brakes, in particular to an electromagnetic brake. Background Art

[0002] Currently, the air gap of the electromagnetic brake is only measured at the initial state with a feeler gauge during installation. During operation, the change in the air gap and the decrease in friction caused by the wear of the friction plate cannot be evaluated. In addition, when the brake is released, it is also impossible to quantify whether all points of the armature are fully attracted and whether the braking force is completely released.

[0003] In the prior art, the air gap monitoring is achieved by calibrating the relationship between the voltage and air gap of the electromagnetic brake electromagnetic coil, and then inferring the air gap change by monitoring the coil voltage and current values ​​during actual operation. However, the air gap cannot be calculated indirectly by testing the coil voltage and current, and an accurate value cannot be obtained. In addition, the early wear of the friction plate has little effect on the spring pressure, and the voltage and current changes are also relatively small, so the accuracy cannot be guaranteed.

[0004] Therefore, it is necessary to provide a new electromagnetic brake to solve the above technical problems. Utility Model Content

[0005] The main purpose of the utility model is to provide an electromagnetic brake, aiming to improve the technical problem that the air gap of the electromagnetic brake in the prior art cannot be accurately detected.

[0006] To achieve the above-mentioned purpose, the utility model proposes an electromagnetic brake, comprising a housing, a brake assembly and a distance measuring assembly, wherein the brake assembly comprises a brake disc, a first friction disc, an armature disc, an elastic member and an armature, wherein the first friction disc is arranged on the side of the brake disc facing the housing, one end of the elastic member is connected to the housing, and the other end of the elastic member is connected to the armature disc, the armature disc can abut against the first friction disc, the armature is installed on the housing, and the armature is used to attract the armature disc; the distance measuring assembly comprises a distance measuring component and a collector, the distance measuring component is connected to the collector signal, the distance measuring component is installed on the housing, and the distance measuring component is used to detect the distance between the armature disc and the armature disc.

[0007] In one embodiment, the shell forms a first opening groove, the opening of the first opening groove is arranged toward the armature plate, the elastic member is arranged in the first opening groove, one end of the elastic member is connected to the bottom of the first opening groove, and the other end of the elastic member is connected to the armature plate.

[0008] In one embodiment, the shell is formed with a second opening groove, the opening of the second opening groove is arranged toward the armature plate, the armature is installed in the second opening groove, one side of the armature abuts against the bottom of the second opening groove, and the height of the armature is less than the depth of the second opening groove.

[0009] In one embodiment, the housing is formed with a mounting through hole, the distance measuring component is telescopically mounted in the mounting through hole, and the detection end of the distance measuring component is arranged toward the armature disk.

[0010] In one embodiment, there are multiple ranging components and multiple mounting through holes, and the multiple mounting through holes are arranged at circumferential intervals around the central axis of the shell. The number of the ranging components and the number of the mounting through holes are equal and are arranged one-to-one.

[0011] In one embodiment, the electromagnetic brake further includes an adjusting bolt, and the adjusting bolt passes through the housing and is connected to the armature disk.

[0012] In one embodiment, the distance measuring component includes a displacement sensor.

[0013] In one embodiment, the distance measuring component includes a laser distance sensor.

[0014] In one embodiment, the electromagnetic brake further includes a second friction disk, which is disposed on a side of the brake disk away from the first friction disk, and the second friction disk is used to abut against an external transmission component.

[0015] In one embodiment, the armature plate and the first friction plate are both annular, the width of the armature plate is greater than the width of the first friction plate, and the armature plate can cover the first friction plate.

[0016] In the above scheme, the electromagnetic brake includes a housing, a brake assembly and a distance measuring assembly. The brake assembly includes a brake disc, a first friction disc, an armature disc, an elastic member and an armature. The first friction disc is arranged on the side of the brake disc facing the housing. One end of the elastic member is connected to the housing, and the other end of the elastic member is connected to the armature disc. The armature disc can abut against the first friction disc. The armature is installed on the housing, and the armature is used to attract the armature disc. The distance measuring assembly includes a distance measuring component and a collector. The distance measuring component is connected to the collector signal. The distance measuring component is installed on the housing, and the distance measuring component is used to detect the distance between the armature disc and the armature disc. The electromagnetic brake is installed on the transmission shaft through the brake disc, and then the distance measuring component is installed on the housing. The distance measuring component is connected to the collector signal. The collector receives the value detected by the distance measuring component and feeds it back to the external display device for the operator to read. Then the first friction disc is attached to the brake disc, the armature is installed on the housing, and then the two ends of the elastic member are connected to the housing and the armature disc respectively. After the first friction disc and the armature disc are installed, the feeler gauge is used to measure the distance between the housing and the armature disc. At this time, the distance measured by the distance measuring component is the zero point during braking. Then, when the armature is energized, a magnetic field will be generated, thereby adsorbing the armature disc. At this time, the armature disc will separate from the first friction disc and move toward the housing. Compress the elastic part, so that the external transmission equipment can drive the brake disc to rotate normally, and the distance measuring component will measure the current distance between the armature disc; when braking, the armature is powered off and no longer generates a magnetic field, the elastic part will restore its deformation and drive the armature disc to move toward the first friction disc until it abuts against the first friction disc, so that the brake disc will be subjected to friction during the rotation process, thereby stopping the rotation and achieving the braking effect. At this time, the distance measuring component measures the current distance between the armature disc again, and the difference in distance before and after the armature is attracted obtained by the collector is the current air gap value, so that the real-time monitoring of the air gap value can be achieved, and the change in the air gap value is the wear amount of the first friction disc. By setting the distance measuring component, the distance between the armature disc and the armature disc is detected in real time, so as to achieve real-time monitoring of the air gap value, which is more accurate than the value obtained by converting the current or voltage value, so that the accurate detection of the air gap can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the internal structure of an electromagnetic brake according to an embodiment of the present invention;

[0019] Figure 2A schematic diagram of the internal structure of another embodiment of the electromagnetic brake provided by the utility model;

[0020] Figure 3 This is a top view of the electromagnetic brake provided by the utility model.

[0021] Description of Figure Numbers:

[0022] 100. Electromagnetic brake; 1. Housing; 2. Braking assembly; 3. Distance measuring assembly; 21. Brake disc; 22. First friction disc; 23. Armature disc; 24. Elastic member; 25. Armature; 31. Distance measuring component; 11. First opening slot; 12. Second opening slot; 13. Mounting through hole; 4. Adjusting bolt; 5. Second friction disc.

[0023] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0027] In the prior art, the air gap monitoring is achieved by calibrating the relationship between the voltage and air gap of the electromagnetic brake electromagnetic coil, and then inferring the air gap change by monitoring the coil voltage and current values ​​during actual operation. However, the air gap cannot be calculated indirectly by testing the coil voltage and current, and an accurate value cannot be obtained. In addition, the early wear of the friction plate has little effect on the spring pressure, and the voltage and current changes are also relatively small, so the accuracy cannot be guaranteed.

[0028] See also Figure 1The utility model proposes an electromagnetic brake 100, including a housing 1, a brake assembly 2 and a distance measuring assembly 3, the brake assembly 2 includes a brake disc 21, a first friction disc 22, an armature disc 23, an elastic member 24 and an armature 25, the first friction disc 22 is arranged on the side of the brake disc 21 facing the housing 1, one end of the elastic member 24 is connected to the housing 1, and the other end of the elastic member 24 is connected to the armature disc 23, the armature disc 23 can abut against the first friction disc 22, the armature 25 is installed on the housing 1, and the armature 25 is used to attract the armature disc 23; the distance measuring assembly 3 includes a distance measuring component 31 and a collector, the distance measuring component 31 is connected to the collector signal, the distance measuring component 31 is installed on the housing 1, and the distance measuring component 31 is used to detect the distance between the armature disc 23. The electromagnetic brake 100 is installed on the transmission shaft through the brake disc 21, and then the distance measuring component 31 is installed on the housing 1. The distance measuring component 31 is connected to the collector signal. The collector receives the value detected by the distance measuring component 31 and feeds it back to the external display device for the operator to read. Then the first friction disc 22 is attached to the brake disc 21, the armature 25 is installed on the housing 1, and then the two ends of the elastic member 24 are respectively connected to the housing 1 and the armature disc 23. After the first friction disc 22 and the armature disc 23 are installed, a feeler gauge is used to measure the distance between the housing 1 and the armature disc 23. At this time, the distance measured by the distance measuring component 31 is the zero point during braking. Then, when the armature 25 is energized, a magnetic field will be generated, thereby adsorbing the armature disc 23. At this time, the armature disc 23 will separate from the first friction disc 22 and move toward the housing 1. When the brake disc 21 is in motion, the elastic member 24 is compressed, so that the external transmission equipment can drive the brake disc 21 to rotate normally, and the distance measuring component 31 will measure the current distance between the armature disc 23; when braking, the armature 25 is powered off and no longer generates a magnetic field, the elastic member 24 will recover its deformation, and drive the armature disc 23 to move toward the first friction disc 22 until it abuts against the first friction disc 22, so that the brake disc 21 will be subjected to a friction force opposite to the rotation direction during rotation, thereby stopping rotation and achieving the braking effect, and the distance measuring component 31 will measure the current distance between the armature disc 23 again, and the difference in distance before and after the armature 25 is attracted by the collector is the current air gap value, so that the real-time monitoring of the air gap value can be realized, and the change in the air gap value is the wear amount of the first friction disc 22. By setting the distance measuring component 3, the distance between the armature disc 23 and the armature disc 23 is detected in real time, so as to realize the real-time monitoring of the air gap value, which is more accurate than the value obtained by converting the current or voltage value, so that the accurate detection of the air gap can be realized.

[0029] See also Figure 1 and Figure 2In one embodiment, the shell 1 is formed with a first opening groove 11, the opening of the first opening groove 11 is arranged toward the armature plate 23, the elastic member 24 is arranged in the first opening groove 11, one end of the elastic member 24 is connected to the bottom of the first opening groove 11, and the other end of the elastic member 24 is connected to the armature plate 23. Specifically, the elastic member 24 is placed in the first opening groove 11, and one end of the elastic member 24 is connected to the bottom of the first opening groove 11, and then one end of the elastic member 24 extending out of the first opening groove 11 is connected to the armature disk 23, so that when the armature 25 is energized to generate a magnetic field to adsorb the armature disk 23, the elastic member 24 will be compressed and deformed in the first opening groove 11, so that the elastic member 24 will not be offset during the compression process, and the elastic member 24 is arranged in the first opening groove 11, so that when the magnetic force generated by the armature 25 is large enough, the armature disk 23 is adsorbed to fit with the shell 1, and the elastic member 24 will be completely compressed in the first opening groove 11, so that the elastic member 24 will not affect the measurement of the ranging component 3, thereby ensuring the accuracy of the measurement.

[0030] See also Figure 1 and Figure 2 In one embodiment, the housing 1 is formed with a second opening slot 12, the opening of the second opening slot 12 is arranged toward the armature disc 23, the armature 25 is installed in the second opening slot 12, one side of the armature 25 abuts against the bottom of the second opening slot 12, and the height of the armature 25 is less than the depth of the second opening slot 12. When the armature 25 is energized, a magnetic field will be generated, thereby adsorbing the armature disc 23, and the armature disc 23 will be separated from the first friction disc 22, move toward the housing 1, and compress the elastic member 24. Since the armature 25 is installed in the second opening slot 12, and the height of the armature 25 is less than the depth of the second opening slot 12, the side of the armature 25 facing the armature disc 23 will not extend out of the surface of the housing 1, so that the armature 25 can adsorb the armature disc 23 to abut against the housing 1, so that the armature 25 will not affect the measurement of the distance measuring component 3, and the accuracy of the measurement is further ensured.

[0031] See also Figure 1 and Figure 2 In one embodiment, the housing 1 is formed with a mounting through hole 13, and the distance measuring component 31 is telescopically mounted in the mounting through hole 13, and the detection end of the distance measuring component 31 is arranged toward the armature plate 23. By telescopically setting the distance measuring component 31 in the mounting through hole 13, the position of the distance measuring component 31 can be adjusted to ensure that the distance measuring component 3 can measure the distance between the armature plate 23.

[0032] See also Figure 1 and Figure 3In one embodiment, the number of the distance measuring components 31 is multiple, the number of the mounting through holes 13 is multiple, and the multiple mounting through holes 13 are arranged at circumferential intervals around the central axis of the housing 1. The number of the multiple distance measuring components 31 and the multiple mounting through holes 13 are equal and arranged in a one-to-one correspondence. By setting multiple distance measuring components 31, and the multiple distance measuring components 31 are arranged at circumferential intervals around the central axis of the housing 1, the air gap value at each position can be detected, and the suction condition of each position of the armature disc 23 can also be detected. When the friction force generated by the side of the armature disc 23 and the central axis of the brake disc 21 is different, the armature disc 23 will be tilted when attracted by the armature 25. In this way, the multiple distance measuring components 31 can measure the air gap value at each position to ensure that each position of the armature disc 23 can be sucked.

[0033] See also Figure 2 In one embodiment, the electromagnetic brake 100 further includes an adjusting bolt 4, which passes through the housing 1 and is connected to the armature plate 23. The initial air gap value can be adjusted by adjusting the bolt 4 so that the air gap value can meet the use requirements; and the abutment force between the armature plate 23 and the first friction plate 22 can also be adjusted by adjusting the bolt 4, thereby adjusting the braking force.

[0034] In one embodiment, the distance measuring component 3 includes a displacement sensor. The displacement sensor can provide very high measurement accuracy and can perform measurement without contacting the target object, which reduces the risk of wear and interference, so that the displacement sensor has a longer working life, the displacement sensor can achieve a faster response time, can monitor the position change of the object in real time, and the displacement sensor is easy to install and simple to maintain.

[0035] In one embodiment, the distance measuring component 3 includes a laser distance sensor. The laser distance sensor can cover a larger measurement range, and the laser distance sensor has a strong anti-interference ability, and can maintain a stable measurement result even in a complex environment.

[0036] See also Figure 1 and Figure 2 In one embodiment, the electromagnetic brake 100 further includes a second friction disc 5, which is disposed on the side of the brake disc 21 away from the first friction disc 22, and is used to abut against an external transmission component. During the braking process, the armature disc 23 abuts against the first friction disc 22, and the second friction disc 5 abuts against the external transmission component, so that the brake disc 21 is subjected to a friction wheel in the opposite direction of rotation, and the external transmission component is also subjected to a friction wheel in the opposite direction of rotation, so that the external transmission component and the brake disc 21 can be subjected to friction at the same time, thereby improving the braking effect.

[0037] In one embodiment, the first friction disc 22 and the armature disc 23 are both annular, the width of the armature disc 23 is greater than the width of the first friction disc 22, and the armature disc 23 can cover the first friction disc 22. Through such a configuration, the armature disc 23 can abut against the surface of the entire first friction disc 22, so that when the armature disc 23 abuts against the first friction disc 22, the friction force between the armature disc 23 and the first friction disc 22 can be increased, and the braking capacity of the electromagnetic brake 100 is further improved.

[0038] The above are only exemplary embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electromagnetic brake, characterized in that: The invention comprises a housing (1), a brake assembly (2) and a distance measuring assembly (3); the brake assembly (2) comprises a brake disc (21), a first friction disc (22), an armature disc (23), an elastic member (24) and an armature (25); the first friction disc (22) is arranged on the side of the brake disc (21) facing the housing (1); one end of the elastic member (24) is connected to the housing (1); the other end of the elastic member (24) is connected to the armature disc (23); the armature disc (23) can abut against the first friction disc (22); the armature is mounted on the housing (1); and the armature (25) is used to attract the armature disc (23); the distance measuring assembly (3) comprises a distance measuring component (31) and a collector; the distance measuring component (31) is connected to the collector signal; the distance measuring component (31) is mounted on the housing (1); and the distance measuring component (31) is used to detect the distance between the armature disc (23) and the armature disc (23).

2. The electromagnetic brake according to claim 1, characterized in that The housing (1) is formed with a first opening groove (11), the opening of the first opening groove (11) is arranged toward the armature plate (23), the elastic member (24) is arranged in the first opening groove (11), one end of the elastic member (24) is connected to the groove bottom of the first opening groove (11), and the other end of the elastic member (24) is connected to the armature plate (23).

3. The electromagnetic brake according to claim 1, characterized in that The housing (1) is formed with a second opening groove (12), the opening of the second opening groove (12) is arranged toward the armature plate (23), the armature (25) is installed in the second opening groove (12), one side of the armature (25) abuts against the bottom of the second opening groove (12), and the height of the armature (25) is less than the depth of the second opening groove (12).

4. The electromagnetic brake according to claim 1, characterized in that The housing (1) is formed with a mounting through hole (13), the distance measuring component (31) is telescopically mounted in the mounting through hole (13), and the detection end of the distance measuring component (31) is arranged toward the armature disk (23).

5. The electromagnetic brake according to claim 4, characterized in that The number of the distance measuring components (31) is multiple, the number of the mounting through holes (13) is multiple, the multiple mounting through holes (13) are arranged at circumferential intervals around the central axis of the shell (1), and the number of the multiple distance measuring components (31) and the multiple mounting through holes (13) are equal and arranged in a one-to-one correspondence.

6. The electromagnetic brake according to claim 1, characterized in that The electromagnetic brake also includes an adjusting bolt (4), which passes through the housing (1) and is connected to the armature plate (23).

7. The electromagnetic brake according to claim 1, characterized in that The distance measuring component (3) comprises a displacement sensor.

8. The electromagnetic brake according to claim 1, characterized in that The distance measuring component (3) comprises a laser distance sensor.

9. The electromagnetic brake according to any one of claims 1 to 8, characterized in that The electromagnetic brake further comprises a second friction disc (5), wherein the second friction disc (5) is arranged on a side of the brake disc (21) away from the first friction disc (22), and the second friction disc (5) is used for abutting against an external transmission component.

10. The electromagnetic brake according to any one of claims 1 to 8, characterized in that The first friction disc (22) and the armature disc (23) are both annular, the width of the armature disc (23) is greater than the width of the first friction disc (22), and the armature disc (23) can cover the first friction disc (22).

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