An electromagnetic braking switch

Abstract

The invention discloses an electromagnetic brake switch, comprising: a housing (10), defining an accommodating cavity (10A) therein; a pull rod assembly (20), which is stretchably mounted in the accommodating cavity (10A) and at least partially extends out of the housing (10); wherein the pull rod assembly (20) is provided with a magnet (25); a brake power-off switch (30), which is arranged near the pull rod assembly (20) and can move between an open position for opening the brake power-off switch (30) and a closed position for closing the brake power-off switch (30) under the action of the pull rod assembly (20); and a Hall sensor (40), which is arranged near the magnet (25) and is used to sense the change in the magnetic field of the magnet (25) accompanying the movement of the pull rod assembly (20) and generate an electrical signal of corresponding magnitude. The electromagnetic brake switch can effectively measure the braking force and provide a parameter reference for braking.

Description

Technical Field

[0001] The present invention relates to the field of braking devices, and more particularly to an electromagnetic braking switch. Background Art

[0002] The electromagnetic braking switch is applied to electric tricycles. In the prior art, the electromagnetic braking switch is in a normally open or normally closed state under the action of an external force (for example, stepping on a foot pedal), and only plays the role of turning on and off the power supply. Its function is relatively single, and its structure is relatively complex, with poor reliability. Summary of the Invention

[0003] In view of the problems and requirements mentioned above, the present solution proposes an electromagnetic braking switch, which can achieve the above technical objectives and bring many other technical effects due to the following technical features.

[0004] The present invention proposes an electromagnetic braking switch, comprising:

[0005] A housing that defines an accommodation cavity inside;

[0006] A pull rod assembly that is stretchably installed in the accommodation cavity and at least partially extends out of the housing; wherein, a magnet is arranged on the pull rod assembly;

[0007] A brake power-off switch that is arranged close to the pull rod assembly and can move between an open position for opening the brake power-off switch and a closed position for closing the brake power-off switch under the action of the pull rod assembly;

[0008] A Hall sensor that is arranged close to the magnet and is used to sense the change amount of the magnetic field of the magnet accompanying the movement of the pull rod assembly and form an electric signal of corresponding magnitude;

[0009] Wherein, when the pull rod assembly moves out of the accommodation cavity and moves to a specified position, the brake power-off switch is in the closed position; when the pull rod assembly moves and contracts into the accommodation cavity and moves to a specified position, the brake power-off switch is in the open position.

[0010] In this technical solution, under the action of an external force, the pull rod assembly makes a telescopic movement. When the pull rod assembly moves out of the accommodation cavity and reaches a specified position, the brake power-off switch is in the closed position and inputs a brake signal to the control element, and the control element controls the actuating element coupled thereto to stop working; when the pull rod assembly moves and contracts into the accommodation cavity and reaches a specified position, the brake power-off switch is in the open position. At this time, the brake power-off switch is opened, and the control element controls the actuating element to continue working; during this process, the Hall sensor can convert the movement stroke of the pull rod assembly into an electrical signal of a corresponding magnitude to measure the braking force and provide a parameter reference for braking. Moreover, the structure is simple, the manufacturing is convenient, and the reliability is strong.

[0011] In addition, the electromagnetic brake switch according to the present invention may further have the following technical features:

[0012] In an example of the present invention, the pull rod assembly includes:

[0013] A pull rod body, which is telescopically coupled with the accommodation cavity;

[0014] A first elastic body, which is at least coupled with the pull rod body and enables the pull rod body to have a tendency force to return to the initial position under the drive of an external force.

[0015] In an example of the present invention, the pull rod assembly further includes:

[0016] A first insulating tube body, which is sleeved outside the pull rod body, and one end of the second elastic body is coupled with the pull rod body, and the other end thereof is coupled with the first insulating tube body.

[0017] In an example of the present invention, the pull rod assembly further includes:

[0018] A baffle plate, which is fixedly coupled with the pull rod body and at least part of it is disposed opposite to the insulating rod.

[0019] In an example of the present invention, the brake power-off switch includes:

[0020] A connecting body, configured with a plug hole and coupled with a power source;

[0021] An insulating rod, which is fitted in the plug hole;

[0022] A second elastic body, one end of which is fixedly coupled with the insulating rod, and the other end thereof is coupled with the control element;

[0023] When the pull rod assembly moves out of the accommodation cavity and reaches a specified position, the insulating rod is separated from the pull rod assembly, and the second elastic body is coupled with the connecting body;

[0024] When the pull rod assembly moves and contracts into the accommodation cavity and reaches a specified position, the second elastic body is separated from the connecting body.

[0025] In an example of the present invention, the connecting body is a U-shaped groove structure, the insertion hole is arranged at the bottom of the U-shaped groove, and the insulating rod adapted to the insertion hole can reciprocate along the groove depth direction.

[0026] In an example of the present invention, it further includes: a conductive blocking body,

[0027] which is fixedly connected between the second elastic body and the insulating rod, and the outer contour dimension of the conductive blocking body is larger than the inner diameter dimension of the insertion hole.

[0028] In an example of the present invention, it further includes: a second insulating tube body,

[0029] The connecting body is fixedly connected inside the second insulating tube body, such that the insulating rod is arranged along the axial direction of the second insulating tube body;

[0030] wherein, the second elastic body penetrates into the second insulating tube body from one end, and the insulating rod extends out from the other end of the second insulating tube body.

[0031] In an example of the present invention, the housing includes:

[0032] a front shell and a rear shell which are oppositely arranged and detachably connected, and the front shell and the rear shell jointly define the accommodation cavity;

[0033] wherein, a plurality of card slots are arranged in the accommodation cavity, and the pull rod assembly, the brake power-off switch, and the Hall sensor are adapted to be snap-fitted in the card slots.

[0034] In an example of the present invention, a plurality of first half-card slots are arranged on the front shell, and a plurality of second half-card slots are arranged on the rear shell; when the front shell and the rear shell are mutually connected, the first half-card slots and the second half-card slots opposite thereto jointly define the card slots.

[0035] In the following, the optimal embodiments for implementing the present invention will be described in more detail in conjunction with the accompanying drawings, so as to facilitate an easy understanding of the features and advantages of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly introduced below. Among them, the accompanying drawings are only used to show some embodiments of the present invention, rather than limiting all embodiments of the present invention thereto.

[0037] Figure 1Front view of the electromagnetic braking switch according to an embodiment of the present invention;

[0038] Figure 2 Front view of the electromagnetic braking switch according to an embodiment of the present invention (front housing hidden);

[0039] Figure 3 Exploded view of the electromagnetic braking switch according to an embodiment of the present invention;

[0040] Figure 4 Schematic structural view of the braking power-off switch according to an embodiment of the present invention (closed position);

[0041] Figure 5 Schematic structural view of the braking power-off switch according to an embodiment of the present invention (open position).

[0042] List of reference numerals:

[0043] Electromagnetic braking switch 100;

[0044] Housing 10;

[0045] Front housing 11;

[0046] Rear housing 12;

[0047] Fastener 13;

[0048] Second half-card slot 14;

[0049] Receiving cavity 10A;

[0050] Tie rod assembly 20;

[0051] Tie rod body 21;

[0052] First elastic body 22;

[0053] First insulating tube body 23;

[0054] Baffle 24;

[0055] Magnet 25;

[0056] Braking power-off switch 30;

[0057] Connector 31;

[0058] Insertion hole 311;

[0059] Insulating rod 32;

[0060] Second elastic body 33;

[0061] Conductive blocking body 34;

[0062] Second insulating tube body 35;

[0063] Hall sensor 40. Detailed implementation

[0064] In order to make the objectives, technical solutions and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present invention. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0065] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention belongs. The "first", "second" and similar terms used in the specification and claims of this patent application for the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "one" do not necessarily indicate a quantity limitation. Words such as "comprising" or "including" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The terms "connected" or "coupled" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0066] An electromagnetic braking switch 100 according to the present invention, as Figures 1 to 5 shown, includes:

[0067] A housing 10, which defines an accommodation cavity 10A therein;

[0068] A pull rod assembly 20, stretchably installed in the accommodation cavity 10A and at least partially extending out of the housing 10; wherein, a magnet 25 is arranged on the pull rod assembly 20;

[0069] A brake power-off switch 30, arranged close to the pull rod assembly 20, capable of moving between an open position for opening the brake power-off switch 30 and a closed position for closing the brake power-off switch 30 under the action of the pull rod assembly 20;

[0070] A Hall sensor 40 is disposed near the magnet 25 and is configured to sense the change in the magnetic field of the magnet 25 along with the movement of the pull rod assembly 20 and form an electrical signal of a corresponding magnitude; that is to say, the Hall sensor 40 is used to linearly measure the movement stroke of the pull rod assembly 20 and convert it into a corresponding electrical signal; namely, the Hall sensor 40 converts the movement stroke amount of the pull rod assembly 20 into an electrical signal of a corresponding magnitude.

[0071] Wherein, when the pull rod assembly 20 moves out of the receiving cavity 10A and moves to a specified position, the brake power-off switch 30 is in a closed position; when the pull rod assembly 20 moves into the receiving cavity 10A and moves to a specified position, the brake power-off switch 30 is in an open position;

[0072] Under the action of an external force, the pull rod assembly 20 makes a telescopic movement. When the pull rod assembly 20 moves out of the receiving cavity 10A and moves to a specified position, the brake power-off switch 30 is in a closed position and inputs a brake signal to the control element, and the control element controls the actuator coupled thereto to stop working; when the pull rod assembly 20 moves into the receiving cavity 10A and moves to a specified position, the brake power-off switch 30 is in an open position. At this time, the brake power-off switch 30 is opened, and the control element controls the actuator to continue working; during this process, the Hall sensor 40 can convert the movement stroke amount of the pull rod assembly 20 into an electrical signal of a corresponding magnitude to measure the braking force and provide a parameter reference for braking. Moreover, the structure is simple, the manufacturing is convenient, and the reliability is strong.

[0073] For example, the control element is a controller, the actuator is a motor, the brake power-off switch 30 and the Hall sensor 40 are both coupled to the control element. Under the action of an external force, the pull rod assembly 20 makes a telescopic movement. When the pull rod assembly 20 moves out of the receiving cavity 10A and moves to a specified position, the brake power-off switch 30 is in a closed position and generates a brake signal. The controller controls the motor to stop rotating. At the same time, the controller outputs a braking torque signal to the motor according to the change amount of the movement of the pull rod assembly 20 measured by the Hall sensor 40 to control the motor to generate an electromagnetic braking force, thereby achieving the effect of motor braking; that is to say, the controller outputs a back electromotive force according to an electrical signal of a corresponding magnitude to control the motor to generate an electromagnetic braking force, thereby achieving the effect of motor braking; when the pull rod assembly 20 moves into the receiving cavity 10A and moves to a specified position, the brake power-off switch 30 is in an open position. At this time, the brake power-off switch 30 is opened, and the controller 200 controls the motor to continue working.

[0074] The controller controls the magnitude of the electromagnetic braking force generated by the motor according to the strength of the braking torque signal. The voltage of the braking torque signal is proportional to the electromagnetic braking force. The deeper the brake pedal is depressed, the greater the electromagnetic braking force generated. At the same time, the electromagnetic braking force is proportional to the vehicle's driving speed. The higher the vehicle speed, the stronger the braking force.

[0075] When braking, the drive motor is controlled by the controller to be converted into a permanent magnet synchronous generator. Utilizing the inertia of the vehicle's driving, it is transmitted to the motor rotor through the power system. The controller enables it to generate electricity and simultaneously generates an electromagnetic braking force, playing an auxiliary braking role, so that the motor controller plays an electromagnetic auxiliary braking role during braking. At the same time, the electrical energy generated during electromagnetic braking can be recharged to the battery, playing an energy recovery role and increasing the driving range of the electric vehicle.

[0076] In an example of the present invention, the pull rod assembly 20 includes:

[0077] A pull rod body 21, which is telescopically and cooperatively connected with the accommodation cavity 10A;

[0078] A first elastic body 22, which is at least connected to the pull rod body 21 and enables the pull rod body 21 to have a tendency to restore to its initial position under the drive of an external force;

[0079] That is to say, the pull rod body 21 extends out of the housing 10 under the action of an external force. During this process, it will squeeze the first elastic body 22 and generate an elastic force. When the external force is released, the pull rod body 21 returns to its initial position under the elastic force of the first elastic body 22. By connecting the first elastic body 22 with the pull rod body 21, the pull rod body 21 can return to its initial position, facilitating the repeated operation of the pull rod assembly 20.

[0080] In an example of the present invention, the pull rod assembly 20 further includes:

[0081] A first insulating tube body 23, which is sleeved outside the pull rod body 21, and one end of the first elastic body 22 is connected to the pull rod body 21, and the other end is connected to the first insulating tube body 23;

[0082] Specifically, the first insulating tube body 23 is connected in the accommodation cavity 10A. The first elastic body 22 can be a tension spring, which is sleeved on the pull rod body 21, and one of its pins is fixedly connected to the pull rod body 21, and the other pin is fixedly connected to the first insulating tube body 23. Thus, when the pull rod body 21 makes an extending movement, it squeezes the tension spring and enables the first elastic body 22 to generate an elastic force to restore the pull rod body 21 to its initial position. After the external force is released, the pull rod body 21 returns to its initial position. It should be noted that the first elastic body 22 can also be a spring sheet.

[0083] In an example of the present invention, the pull rod assembly 20 further includes:

[0084] A baffle 24, which is fixedly coupled to the pull rod body 21 and at least part of which is disposed opposite to the insulating rod 32;

[0085] By providing the baffle 24, the effective contact area of the pull rod body 21 can be increased, thereby facilitating the abutment against and release of the insulating rod 32; preferably, the baffle 24 is perpendicularly disposed with respect to the pull rod body 21.

[0086] In an example of the present invention, the brake power-off switch 30 includes:

[0087] A connecting body 31, configured with a plug hole 311 and coupled to a power source;

[0088] An insulating rod 32, adapted to be fitted in the plug hole 311;

[0089] A second elastic body 33, one end of which is fixedly coupled to the insulating rod 32 and the other end of which is coupled to a control element;

[0090] When the pull rod assembly 20 moves out of the receiving cavity 10A and moves to a designated position, the insulating rod 32 is separated from the pull rod assembly 20, and the insulating rod 32 moves along the plug hole 311 under the action of the second elastic body 33 such that the second elastic body 33 is coupled to the connecting body 31;

[0091] When the pull rod assembly 20 moves into the receiving cavity 10A and moves to a designated position, the insulating rod 32 abuts against the pull rod assembly 20, and the insulating rod 32 moves along the plug hole 311 such that the second elastic body 33 is separated from the connecting body 31;

[0092] For example, the second elastic body 33 is a compression spring, and both the connecting body 31 and the compression spring are conductors. When the pull rod assembly 20 moves out of the receiving cavity 10A and moves to a designated position, the insulating rod 32 moves out under the action of the compression spring and is separated from the pull rod assembly 20, and the insulating rod 32 moves along the plug hole 311 such that the second elastic body 33 is coupled to the connecting body 31. At this time, the brake power-off switch 30 is in a closed position and inputs a brake signal to the control element, and the control element controls the actuating element coupled thereto to stop working;

[0093] When the pull rod assembly 20 moves into the receiving cavity 10A and moves to a designated position, the insulating rod 32 abuts against the pull rod assembly 20, and the insulating rod 32 moves along the plug hole 311 such that the second elastic body 33 is separated from the connecting body 31. At this time, the brake power-off switch 30 is opened, and the control element controls the actuating element to continue working.

[0094] In an example of the present invention, the connector 31 has a U-shaped groove structure, and the insertion hole 311 is arranged at the bottom of the U-shaped groove. The insulating rod 32 adapted to the insertion hole 311 can reciprocate along the groove depth direction;

[0095] That is to say, the insulating rod 32 can move in the U-shaped groove, and the moving direction is parallel to the side wall of the U-shaped groove structure. In this way, it can be ensured that the second elastic body 33 avoids contacting the connector 31 during the movement of the insulating rod 32, and the second elastic body 33 is coupled with the connector 31 after moving to the bottom of the U-shaped groove;

[0096] The U-shaped groove can facilitate the connection and separation between the second elastic body 33 and the connector 31, and ensure the reliability of the connection and separation between the second elastic body 33 and the connector 31.

[0097] In an example of the present invention, it further includes: a conductive stopper 34,

[0098] It is fixedly connected between the second elastic body 33 and the insulating rod 32, and the outer contour dimension of the conductive stopper 34 is larger than the inner diameter dimension of the insertion hole 311;

[0099] By providing the conductive stopper 34, when the second elastic body 33 moves to the bottom of the U-shaped groove, the second elastic body 33 can be stopped from continuing to move, playing a limiting role, protecting the second elastic body 33 from excessive stretching, and at the same time not affecting the electrical connection between the second elastic body 33 and the connector 31.

[0100] In an example of the present invention, it further includes: a second insulating tube body 35,

[0101] The connector 31 is fixedly connected in the second insulating tube body 35, so that the insulating rod 32 is arranged along the axial direction of the second insulating tube body 35;

[0102] Wherein, the second elastic body 33 penetrates into one end of the second insulating tube body 35 and is connected to the insulating rod 32, and the insulating rod 32 extends out from the other end of the second insulating tube body 35;

[0103] By providing the second insulating tube body 35, it can protect the connector 31, the second elastic body 33 and the insulating rod 32, and avoid electric leakage of the brake power-off switch 30.

[0104] In an example of the present invention, the housing 10 includes:

[0105] A front shell 11 and a rear shell 12 which are oppositely arranged and detachably connected to each other, and the front shell 11 and the rear shell 12 jointly define the accommodation cavity 10A;

[0106] Among them, a plurality of card slots are arranged in the accommodation cavity 10A, and the pull rod assembly 20, the brake power-off switch 30, and the Hall sensor 40 are adapted to be clamped in the card slots;

[0107] The front shell 11 and the rear shell 12 are detachably connected by a fastener 13. A plurality of first connection holes are arranged on the front shell 11. Correspondingly, a plurality of second connection holes corresponding to the first connection holes one by one are arranged on the rear shell 12. The fastener 13 sequentially passes through the front shell 11 and the rear shell 12; This connection method is convenient for disassembly and assembly and has high reliability.

[0108] The housing 10 forms an accommodation cavity 10A through the detachable connection of the front shell 11 and the rear shell 12, which is convenient for assembling and installing other components; arranging the card slots is convenient for the disassembly and assembly between the pull rod assembly 20, the brake power-off switch 30, the Hall sensor 40 and the accommodation cavity 10A.

[0109] In an example of the present invention, a plurality of first half-card slots are arranged on the front shell 11, and a plurality of second half-card slots 14 are arranged on the rear shell 12; when the front shell 11 and the rear shell 12 are connected to each other, the first half-card slot and the second half-card slot 14 opposite thereto jointly define the card slot;

[0110] By arranging the first half-card slot and the second half-card slot 14 on the front shell 11 and the rear shell 12 respectively, it is convenient for the processing and forming of the card slot. For example, it can be integrally processed and formed by injection molding.

[0111] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention belongs. The "first", "second" and similar terms used in the specification and claims of this patent application for invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "one" do not necessarily indicate a quantity limitation. Words such as "comprising" or "including" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connection" or "connected" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0112] The exemplary embodiments of the electromagnetic braking switch 100 proposed by the present invention have been described in detail above with reference to the preferred embodiments. However, those skilled in the art can understand that, without departing from the concept of the present invention, various modifications and alterations can be made to the above specific embodiments, and various combinations of the technical features and structures proposed by the present invention can be made, without exceeding the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. An electromagnetic braking switch, characterized in that, Comprising: A housing (10) defining an accommodation cavity (10A) therein; A pull rod assembly (20) stretchably mounted within the accommodation cavity (10A) and at least partially protruding from the housing (10); wherein, a magnet (25) is disposed on the pull rod assembly (20); A brake power-off switch (30) disposed adjacent to the pull rod assembly (20) and capable of moving between an open position for opening the brake power-off switch (30) and a closed position for closing the brake power-off switch (30) under the action of the pull rod assembly (20); A Hall sensor (40) disposed adjacent to the magnet (25) for sensing the change in the magnetic field of the magnet (25) accompanying the movement of the pull rod assembly (20) and forming an electrical signal of a corresponding magnitude; Wherein, when the pull rod assembly (20) moves out of the accommodation cavity (10A) and moves to a specified position, the brake power-off switch (30) is in the closed position; when the pull rod assembly (20) moves into the accommodation cavity (10A) and moves to a specified position, the brake power-off switch (30) is in the open position; The pull rod assembly (20) includes: A pull rod body (21) telescopically and cooperatively connected with the accommodation cavity (10A); A first elastic body (22) at least connected to the pull rod body (21) and enabling the pull rod body (21) to have a tendency to return to its initial position under an external force; The brake power-off switch (30) includes: A connecting body (31) configured with a plug hole (311) and coupled to a power source; An insulating rod (32) fitted in the plug hole (311); A second elastic body (33) having one end fixedly connected to the insulating rod (32) and the other end coupled to a control element; When the pull rod assembly (20) moves out of the accommodation cavity (10A) and moves to a specified position, the insulating rod (32) is separated from the pull rod assembly (20), and the second elastic body (33) is coupled to the connecting body (31); When the pull rod assembly (20) moves into the accommodation cavity (10A) and moves to a specified position, the insulating rod (32) abuts against the pull rod assembly (20), and the second elastic body (33) is separated from the connecting body (31).

2. The electromagnetic braking switch according to claim 1, wherein The pull rod assembly (20) further includes: A first insulating tube body (23) sleeved outside the pull rod body (21), and one end of the first elastic body (22) is connected to the pull rod body (21) and the other end thereof is connected to the first insulating tube body (23).

3. The electromagnetic braking switch according to claim 1, wherein The pull rod assembly (20) further includes: A baffle (24) fixedly connected to the pull rod body (21) and at least partially disposed opposite to the insulating rod (32).

4. The electromagnetic braking switch according to claim 1, wherein The connecting body (31) has a U-shaped groove structure, and the insertion hole (311) is arranged at the bottom of the U-shaped groove. The insulating rod (32) adapted to the insertion hole (311) can reciprocate along the groove depth direction.

5. The electromagnetic braking switch according to claim 1, characterized in that further comprising: a conductive stopper (34), which is fixedly connected between the second elastic body (33) and the insulating rod (32), and the outer contour dimension of the conductive stopper (34) is larger than the inner diameter dimension of the insertion hole (311).

6. The electromagnetic braking switch according to claim 1, characterized in that further comprising: a second insulating tube body (35), the connecting body (31) is fixedly connected within the second insulating tube body (35) such that the insulating rod (32) is arranged along the axial direction of the second insulating tube body (35); wherein, the second elastic body (33) penetrates into one end of the second insulating tube body (35), and the insulating rod (32) extends out from the other end of the second insulating tube body (35).

7. The electromagnetic braking switch according to claim 1, characterized in that the housing (10) includes: a front shell (11) and a rear shell (12) which are arranged opposite to each other and are detachably connected, and the front shell (11) and the rear shell (12) jointly define the accommodation cavity (10A); wherein, a plurality of card slots are arranged in the accommodation cavity (10A), and the pull rod assembly (20), the brake power-off switch (30), and the Hall sensor (40) are adapted to be snap-fitted in the card slots.

8. The electromagnetic braking switch according to claim 7, characterized in that a plurality of first half-card slots are arranged on the front shell (11), and a plurality of second half-card slots (14) are arranged on the rear shell (12); when the front shell (11) and the rear shell (12) are connected to each other, the first half-card slots and the second half-card slots (14) opposite thereto jointly define the card slots.

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