Electromagnetic arm disc brake capable of detecting braking force

Abstract

The utility model relates to an electromagnetic arm disc brake capable of detecting braking force. The electromagnetic arm disc brake structurally comprises a base, a brake arm, a brake shoe, a brake feeding mechanism and a brake releasing mechanism. A sensor used for detecting braking force is arranged in a middle interlayer of the brake shoe, and penetrating holes are formed in the two ends of a sensor substrate respectively. The brake shoe pin shaft penetrates through the shaft hole in the brake arm and the connecting shaft hole in the brake shoe to connect the brake shoe to the brake arm; a penetrating hole is formed in the brake shoe, the sensor pin shaft penetrates through the penetrating hole and the penetrating hole in one end of the sensor substrate, the sensor is connected to the brake shoe, the penetrating hole in the other end of the sensor substrate is connected to the brake shoe pin shaft in a penetrating mode, and the sensor substrate is kept in an upright state; a connecting shaft hole in the brake shoe is a vertical oblong hole, and the axis of a pin shaft of the brake shoe is located in the middle of the connecting shaft hole of the brake shoe in the length direction due to the arrangement interval of the two penetrating holes in the sensor substrate.

Description

Technical Field

[0001] The utility model relates to an electromagnetic arm disc brake, in particular to an electromagnetic arm disc brake capable of detecting braking force. Background Art

[0002] CN111524318 discloses a hydraulic arm disc brake for detecting braking torque. This hydraulic arm disc brake includes a base, a brake arm, a brake shoe, a brake-applying mechanism, and a brake-release mechanism. The key design feature is that the axial hole in the brake arm, which supports the brake shoe hinge shaft, is designed as an oblong axial hole. The length of the oblong axial hole aligns with the direction of the friction force exerted on the brake shoe friction surface at a position equal to the axis of the brake shoe hinge shaft during braking. This allows the brake shoe hinge shaft to move upward or downward along its length within the oblong axial hole of the brake arm under the action of the braking friction force, generating a braking displacement. The specific direction of the upward or downward movement is related to the rotational direction of the brake disc, and the magnitude of this braking displacement is proportional to the product of the normal pressure applied by the arm disc brake to the brake disc during braking and the friction coefficient between the brake shoe and the brake disc. This patent overcomes the problem that the existing hydraulic arm disc brake cannot detect braking force, thereby improving the reliability and safety of the hydraulic arm disc brake.

[0003] However, there is currently no suitable sensor installation structure on the electromagnetic arm disc brake to realize the braking force detection of the electromagnetic arm disc brake. Utility Model Content

[0004] The purpose of the utility model is to provide an electromagnetic arm disc brake capable of detecting braking force, so as to realize the detection of braking force by the electromagnetic arm disc brake.

[0005] The purpose of the utility model is achieved like this:

[0006] An electromagnetic arm disc brake capable of detecting braking force comprises a base, a brake arm, a brake shoe, a brake applying mechanism and a brake releasing mechanism; a sensor for detecting braking force is provided in a middle interlayer of the brake shoe, the sensor comprising a sensor substrate and a pressure sensing chip, with holes respectively provided at both ends of the sensor substrate; the brake shoe pin passes through an axial hole on the brake arm and a coupling hole on the brake shoe, connecting the brake shoe to the brake arm; a through hole is also provided on the brake shoe, the sensor pin passes through the through hole and a through hole at one end of the sensor substrate, connecting the sensor to the brake shoe, the through hole at the other end of the sensor substrate is connected to the brake shoe pin, so that the sensor substrate remains upright; the coupling hole on the brake shoe is a vertical oblong hole, and the spacing between the two through holes on the sensor substrate enables the axis of the brake shoe pin to be located at the longitudinal center of the brake shoe coupling hole.

[0007] Furthermore, the brake-applying mechanism includes a spring box connected between the two brake arms, a brake spring arranged in the spring box, a spring pressure plate pressed on one end of the brake spring, an adjusting screw connected to the spring pressure plate and passing through the brake spring and the brake arm, and an adjusting nut screwed on the protruding end of the adjusting screw.

[0008] Furthermore, the release mechanism includes an electromagnet and a release push rod; the electromagnet is fixed on the top of one brake arm, and the release push rod is laterally fixed on the upper end of the other brake arm and rests on the electromagnetic push rod of the electromagnet.

[0009] The utility model forms an oblong shaft hole on the brake shoe connecting shaft hole on the brake arm, and then realizes a slight suspended connection between the brake shoe and the brake arm through the suspension effect of the sensor substrate. In this way, when the brake shoe clamps the brake disc to apply braking, the brake shoe will produce a slight tensile or compressive displacement. This tensile or compressive displacement varies with the magnitude of the braking friction force applied by the brake shoe. Moreover, this tensile or compressive displacement also drives the tension or compression of the sensor substrate attached to the brake shoe, generating a corresponding plate deformation. The tension and compression sensor on the sensor substrate can convert this plate deformation into an electrical signal of the force magnitude and send it out, thereby realizing real-time detection of the braking friction force of the brake.

[0010] The utility model decomposes the brake shoe into a two-body structure of a shoe seat and a shoe body, and designs the connection between the shoe seat and the shoe body to be connected through an external convex block and a spherical surface, so that the shoe body can produce an appropriate small deflection relative to the shoe seat. When the brake is applied, the shoe body can move with the deflection of the brake disc, so that the braking surface of the brake shoe can be better attached to the disc surface of the brake disc for braking, thereby avoiding rigid eccentric wear of the brake disc on the brake shoe and improving the service life of the brake shoe. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the present utility model.

[0012] Figure 2 yes Figure 1 Side view of the electromagnetic arm disc brake shown.

[0013] Figure 3 、 Figure 4 This is a schematic diagram of the structure of the two split-structure brake shoes used in the brake.

[0014] In the figure: 1. electromagnet, 2. adjusting nut, 3. adjusting screw, 4. right brake arm, 5. sensor pin, 6. sensor, 7. brake shoe pin, 8. base, 9. lower hinge shaft, 10. left brake arm, 11. brake spring, 12. spring pressure plate, 13. spring box, 14. upper hinge shaft, 15. brake release push rod, 16. electromagnetic push rod, 18. brake disc, 20. limit screw, 21. shoe seat, 22. shoe body, 23. friction plate, 24. permanent magnet, 25. screw, 26. gasket, 27. bolt, 28. butterfly spring, 29. nut, 30. coupling hole, 31. connecting ear plate. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Example 1

[0017] like Figure 1 、 Figure 2 As shown, the present invention comprises a left brake arm 10 and a right brake arm 4 hingedly connected to a base 8 via two lower hinge shafts 9. A brake shoe is hingedly connected to each brake arm via a brake shoe pin 7. The brake shoe can be a conventional one-piece structure or a two-piece structure consisting of a shoe base 21 and a shoe body 22. The brake shoes on the two brake arms are located on either side of the equipment's brake disc 18, near the edge of the disc 18. A brake-applying mechanism and a brake-release mechanism are also connected between the two brake arms. The brake-applying mechanism comprises a spring box 13 connected between the two brake arms. The spring box 13 houses a brake spring 11, with a spring pressure plate 12 pressed against one end of the brake spring 11. One end of an adjusting screw 3 is fixedly connected to the spring pressure plate 13. The other end of the adjusting screw 3 passes through the brake spring 11 and outward from the right brake arm 4. An adjusting nut 2 is screwed onto the protruding end of the adjusting screw 3. The brake-release mechanism comprises an electromagnet 1 and a brake-release push rod 15. The electromagnet 1 is fixed on the top platform of the right brake arm 4 , and the brake release push rod 15 is fixedly arranged laterally on the upper end of the left brake arm 10 and rests on the electromagnetic push rod 16 of the electromagnet 1 .

[0018] Figure 2 In the embodiment, a sensor 6 for detecting the braking force is provided in the middle hollow of the shoe seat 21 of the brake shoe. Figure 1 The sensor 6 for detecting the braking force comprises a sensor substrate and a pressure sensing chip located at the center of the sensor substrate. Circular holes are respectively formed at the upper and lower ends of the sensor substrate. The brake shoe pin 7 passes through the shaft hole on the brake arm and the connecting shaft hole 30 on the brake shoe seat 21 ( Figure 3 ), hinge the brake shoe to the brake arm. Figure 3In the embodiment, the coupling hole 30 provided on the shoe seat 21 of the brake shoe is a vertical oblong hole, and a through hole ( Figure 3 ), the sensor pin 5 passes through the through hole on the brake shoe and the through hole on the upper end of the sensor substrate, and connects the sensor 6 to the brake shoe ( Figure 1 ), the through-hole at the lower end of the sensor substrate is connected to the brake shoe pin 7, so that the sensor substrate can remain in an upright position. The spacing between the two through-holes on the sensor substrate should be such that the axis of the brake shoe pin 7 is located at the longitudinal center of the brake shoe's coupling hole 30, thereby keeping the brake shoe in a suspended state. In this way, when the brake is applied, the brake shoe, which is in close contact with the brake disc 18, will produce a slight upward or downward stretch or slight downward compression under the influence of the applied braking friction force, thereby causing the sensor substrate to produce a corresponding plate deformation. The tension and compression sensors on the sensor substrate then convert this plate deformation into an electrical signal indicating the magnitude of the braking friction force and transmit it to the outside, thereby achieving real-time detection of the braking friction force of the electromagnetic arm disc brake.

[0019] like Figure 3 As shown, the brake shoe in this embodiment is divided into two components: a shoe body 22 and a shoe seat 21. The structure of the shoe seat 21 is that two parallel connecting ear plates 31 are provided on the seat base. Figure 2 ), the two connecting ear plates 31 are perpendicular to the base plate of the base body. A coupling hole 30 for the brake shoe pin is opened at the same position on the two connecting ear plates 31. The coupling hole 30 is designed as a vertical oblong hole. The brake shoe pin 7 passes through the coupling hole 30 and hinges the shoe seat 21 to the brake arm of the brake ( Figure 1 A spherical protrusion is provided in the middle of the side of the base plate of the shoe seat 21 that faces the shoe body 22. To reduce processing costs, this spherical protrusion can be integrally mounted on a base and processed separately. This portion can then be welded to a pre-recorded hole in the base plate to form a complete shoe seat. A slot is provided at the top of the spherical protrusion of the shoe seat 21. A permanent magnet 24 with strong magnetic attraction is embedded in this slot and secured to the shoe seat 21 via screws 25, forming a connection between the shoe seat and the shoe body.

[0020] The shoe body 22 is positioned opposite the base plate of the shoe seat 21. The shoe body 22 is a plate-shaped structure, with its outer end surface serving as a braking surface, onto which a friction plate 23 is affixed. A circular groove is formed in the center of the inner end surface of the shoe body 22. The bottom of the groove is a spherical bottom that mates with the spherical protrusion on the shoe seat. Under the attraction of the permanent magnet 24 on the shoe seat 21, the spherical protrusion on the shoe seat 21 tightly mates with the groove on the shoe body 22, achieving a close, movable connection between the shoe body 22 and the shoe seat 21. Furthermore, in this close connection, a clearance is maintained between the opposing surfaces of the shoe body 22 and the shoe seat 21 to accommodate the shoe body's sway. This allows the shoe body 22 to sway substantially in line with the sway of the brake disc 18 during braking, thereby maintaining a complete contact with the brake disc surface and preventing eccentric wear of the brake disc on the brake shoe.

[0021] Figure 3 In the embodiment, a stop screw 20 is inserted through the shoe base 21 and faces the shoe body 22. A stop hole is formed at a position opposite the shoe body 22. The stop hole has a diameter larger than the outer diameter of the screw section of the stop screw 20. The front end of the stop screw 20 on the shoe base 21 is inserted into the stop hole on the shoe body 22 to prevent the shoe body 22 from excessively deflecting relative to the shoe base 21.

[0022] Example 2

[0023] The structure of the electromagnetic arm disc brake of this embodiment, as well as the connection between the brake shoe and sensor 6 and the two brake arms, are identical to those of Example 1, and the mode of operation and mechanism remain consistent. The brake shoe in this embodiment, like that of Example 1, is also decomposed into two components: a shoe body 22 and a shoe base 21. The structures of the shoe body 22 and shoe base 21 are essentially the same as those of Example 1, namely, a spherical protrusion is provided on the shoe base 21, and a groove with a spherical bottom is formed on the shoe body 21. The difference lies in the different connectors between the shoe body 22 and shoe base 21, as well as the different mounting structures adapted for these connectors.

[0024] like Figure 4 As shown, the connectors between the shoe body 22 and the shoe base 21 in this embodiment include a bolt 27 and a disc spring 28. The adaptable mounting structure comprises a stepped, tapered hole on the shoe base 21 that penetrates the shoe base body and the spherical protrusion, and a stepped, tapered hole on the shoe body 22 that penetrates the shoe body and leads to the spherical groove. The bolt 27 is inserted into both the stepped, tapered holes on the shoe base 21 and the shoe body 22, while the disc spring 28 is sleeved onto the bolt 27 and press-fitted to the tapered portion of the stepped, tapered hole on the shoe base 21 via a washer 26 and nut 29, achieving a close, movable connection between the shoe body 22 and the shoe base 21. Furthermore, when the spherical protrusion is in contact with the groove, a clearance is maintained between the opposing surfaces of the shoe body 22 and the shoe base 21 to accommodate shoe body deflection.

Claims

1. An electromagnetic arm disc brake capable of detecting braking force, comprising a base, a brake arm, a brake shoe, a brake application mechanism, and a brake release mechanism; a sensor for detecting braking force is disposed in a central interlayer of the brake shoe, the sensor comprising a sensor substrate and a pressure sensing chip, with holes formed at both ends of the sensor substrate; a brake shoe pin passes through an axial hole in the brake arm and a coupling hole in the brake shoe, connecting the brake shoe to the brake arm; the invention is characterized in that: A through hole is also provided on the brake shoe, and the sensor pin passes through the through hole and the through hole at one end of the sensor substrate to connect the sensor to the brake shoe. The through hole at the other end of the sensor substrate is connected to the brake shoe pin to keep the sensor substrate upright; the coupling hole on the brake shoe is a vertical oblong hole, and the spacing between the two through holes on the sensor substrate makes the axis of the brake shoe pin located in the longitudinal center of the brake shoe coupling hole.

2. The electromagnetic arm disc brake capable of detecting braking force according to claim 1, wherein: The brake-applying mechanism includes a spring box connected between the two brake arms, a brake spring arranged in the spring box, a spring pressure plate pressed on one end of the brake spring, an adjusting screw connected to the spring pressure plate and passing through the brake spring and the brake arm, and an adjusting nut screwed on the protruding end of the adjusting screw.

3. The electromagnetic arm disc brake capable of detecting braking force according to claim 1, wherein: The release mechanism includes an electromagnet and a release push rod; the electromagnet is fixed on the top of one brake arm, and the release push rod is laterally fixed on the upper end of the other brake arm and rests on the electromagnetic push rod of the electromagnet.

4. The electromagnetic arm disc brake capable of detecting braking force according to claim 1, wherein: The brake shoe includes a shoe seat and a shoe body arranged opposite to the shoe seat; an axial hole for passing the brake shoe pin is provided on the shoe seat, and a spherical protrusion protruding from the surface is provided in the middle of the side of the shoe seat opposite to the shoe body; the shoe body is a plate-shaped body, a friction plate is attached to its outer end surface, and a groove is provided in the middle of its inner end surface, the bottom surface of the groove is a spherical bottom that fits with the spherical protrusion on the shoe seat; the shoe seat and the shoe body are tightly connected by a connecting piece, and a clearance gap is maintained between the opposite surfaces of the two to accommodate the deflection of the shoe body.

5. The electromagnetic arm disc brake capable of detecting braking force according to claim 4, wherein: The connecting piece is a permanent magnet block, which is embedded in a groove provided on the spherical protrusion of the shoe seat and fixed to the shoe seat by screws, so as to attract the shoe body to the shoe seat through strong magnetic attraction.

6. The electromagnetic arm disc brake capable of detecting braking force according to claim 4, wherein The shoe seat is provided with a stepped diameter reducing hole that passes through the shoe seat body and the spherical protrusion, and a stepped diameter reducing hole that passes through the shoe body and leads to the spherical groove is provided at a corresponding position on the shoe body; the connecting part includes a bolt and a disc spring, the bolt is passed through the stepped diameter reducing hole on the shoe seat and the stepped diameter reducing hole on the shoe body, the disc spring is sleeved on the bolt, and is pressed onto the reduced diameter position of one of the stepped diameter reducing holes through a nut.

7. The electromagnetic arm disc brake capable of detecting braking force according to claim 4, 5 or 6, wherein The shoe seat is connected with a limiting screw facing the shoe body, and the front end of the limiting screw is inserted into a limiting hole provided at a relative position of the shoe body. The aperture of the limiting hole is larger than the outer diameter of the screw section of the limiting screw.

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