An electromagnetic damping limit switch

Abstract

The present invention relates to the technical field of electromagnetic dampers, and specifically to an electromagnetic damping limit switch, comprising: a magnet pre-arranged on a moving part, the first magnetic pole of the magnet pointing to the electromagnetic damping limit switch; the moving part reciprocates along a preset trajectory, and the electromagnetic damping limit switch is arranged at the end point of the preset trajectory; comprising: an electromagnet, the first magnetic pole of which points to the magnet; a proximity switch, the sensing part of which faces the magnet, and the signal output end of which is connected to the first end of the electromagnet; after the magnet reaches the end point, the proximity switch controls the electromagnet to stop generating a magnetic field. The beneficial effect of the present invention is that by providing a proximity switch for detecting the magnet and controlling the electromagnet, while achieving an electromagnetic damping effect on the moving part, the problem of the electromagnetic damper and the limit switch in the prior art being unable to work together is avoided, thereby causing the moving part to rebound after reaching the limit or failing to correctly trigger the limit switch, thereby achieving a better restraining effect on the moving part.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic dampers, and in particular to an electromagnetic damping limit switch. Background Art

[0002] A limit switch, also known as a travel switch or position switch, is a common low-current master electrical appliance that switches between open and closed states according to the movement of mechanical moving parts, thereby playing a certain role in circuit control. Usually, a limit switch is used to be set at a specific position to limit the movement of mechanical moving parts, so that the mechanical moving parts automatically stop, reverse, change speed, or automatically move back and forth after reaching a specific position or stroke. A damper is a device that provides resistance to movement and consumes movement energy. In the field of mechanical equipment, dampers are usually configured on mechanical moving parts to eliminate the impact or vibration generated by mechanical moving parts during movement. According to different principles, dampers can generally be divided into three categories: liquid dampers, gas dampers, and electromagnetic dampers.

[0003] In the prior art, in order to achieve a better protection effect on mechanical moving parts, there is a device that combines an electromagnetic damper and a limit switch to decelerate the mechanical moving parts when approaching the limit position and stops them when reaching the limit position. For example, prior art 1 (CN108081246B) discloses an artificial muscle device and a driving method thereof, which realizes the control of the components by separately setting an electromagnetic damper and a limit switch. Prior art 2 (CN212302298U) discloses a new type of controllable electromagnetic limiter, which realizes the limit opening and release of the electromagnetic damper through a microprocessor.

[0004] However, during actual implementation, the inventors discovered that existing electromagnetic damper designs typically utilize a conductor or coil moving in a magnetic field to generate an opposing Ampere force within the conductor or coil, thereby providing damping. This approach produces damped vibrations at the limit position and is unable to work in conjunction with the limiter. This approach also provides inaccurate control of the mechanical moving part's position and makes it difficult to adjust the damping coefficient. Summary of the Invention

[0005] In view of the above problems existing in the prior art, an electromagnetic damping limit switch is now provided.

[0006] The specific technical solutions are as follows:

[0007] An electromagnetic damping limit switch, wherein a magnet is pre-arranged on a moving part, and a first magnetic pole of the magnet points to the electromagnetic damping limit switch;

[0008] The moving component reciprocates along a preset track, and the electromagnetic damping limit switch is arranged at an end point of the preset track;

[0009] The electromagnetic damping limit switch comprises:

[0010] an electromagnet, wherein a first magnetic pole of the electromagnet points toward the magnet;

[0011] a proximity switch, wherein a sensing portion of the proximity switch faces the magnet, and a signal output end of the proximity switch is connected to the first end of the electromagnet;

[0012] When the proximity switch detects that the magnet reaches the end point, the proximity switch controls the electromagnet to stop generating the magnetic field.

[0013] Preferably, the signal output terminal of the proximity switch outputs a high level when the magnet is not approaching;

[0014] When the proximity switch detects that the magnet reaches the end point, the signal output end of the proximity switch outputs a low level;

[0015] The second end of the electromagnet is connected to the negative pole of a first power supply circuit.

[0016] Preferably, an adjustable resistor is connected between the second end of the electromagnet and the negative pole of the first power supply circuit.

[0017] Preferably, the signal output terminal is connected to a control terminal of an external first motor, and the first motor is used to drive the moving component to move;

[0018] When the control terminal of the first motor is at a low level, the first motor stops rotating.

[0019] Preferably, the electromagnetic damping limit switch further comprises a housing, in which the electromagnet and the proximity switch are arranged in parallel;

[0020] The first magnetic pole and the second magnetic pole of the electromagnet are distributed in the housing along a horizontal direction;

[0021] The sensing portion of the proximity switch points downward of the housing.

[0022] Preferably, the proximity switch is an NPN type normally closed Hall effect device, or a PNP type normally open Hall effect device.

[0023] Preferably, a second adjustable resistor is provided between the first end of the electromagnet and the signal output end.

[0024] Preferably, the signal output terminal of the proximity switch outputs a low level when the magnet is not approaching;

[0025] When the proximity switch detects that the magnet reaches the end point, the signal output terminal of the proximity switch outputs a high level;

[0026] The second end of the electromagnet is connected to the positive pole of a second power supply circuit.

[0027] Preferably, the signal output terminal is connected to a control terminal of an external second motor, and the second motor is used to drive the moving component to move;

[0028] When the control terminal of the second motor is at a high level, the second motor stops rotating.

[0029] Preferably, the proximity switch is an NPN type normally open Hall effect device, or a PNP type normally closed Hall effect device.

[0030] The above technical solution has the following advantages or beneficial effects: by setting a proximity switch for detecting magnets and controlling electromagnets, the electromagnetic damping effect on the moving parts is achieved while the control of the electromagnets is achieved, avoiding the problem in the prior art that the electromagnetic damper and the limit switch cannot work together, thereby causing the moving parts to rebound after reaching the limit or failing to trigger the limit switch correctly, thereby achieving a better restraint effect on the moving parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The embodiments of the present invention will be described more fully with reference to the accompanying drawings, which are provided for illustration and description only and are not intended to limit the scope of the present invention.

[0032] Figure 1 is an overall schematic diagram of an embodiment of the present invention;

[0033] Figure 2 Schematic diagram of an electromagnetic damping limit switch in an embodiment of the present invention;

[0034] Figure 3 is an overall schematic diagram of another embodiment of the present invention;

[0035] Figure 4 Schematic diagram of an electromagnetic damping limit switch in another embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0039] The present invention comprises:

[0040] An electromagnetic damping limit switch, wherein a magnet 2 is pre-arranged on a moving part 21, and the first magnetic pole of the magnet 2 points to the electromagnetic damping limit switch 1;

[0041] The moving component 21 reciprocates along a preset track, and the electromagnetic damping limit switch 1 is set at the end point of the preset track;

[0042] The electromagnetic damping limit switch 1 includes:

[0043] Electromagnet 12, the first magnetic pole of the electromagnet points to the magnet;

[0044] A proximity switch 11 , wherein a sensing portion of the proximity switch 11 faces the magnet 2 , and a signal output terminal SIG of the proximity switch 11 is connected to a first end of the electromagnet 12 ;

[0045] When the proximity switch 11 detects that the magnet 2 has reached a limit distance, the proximity switch 11 controls the electromagnet 12 to stop generating the magnetic field.

[0046] Specifically, in order to address the problem in the prior art that the electromagnetic damper and the limit switch cannot be used in combination, resulting in poor control effect on the moving parts, in this embodiment, an electromagnet 12 linked to the proximity switch 11 is provided to detect the magnet 2 on the moving part 21, and the electromagnet 12 is controlled to stop generating a magnetic field when the moving part 21 reaches the limit position, thereby avoiding the damping vibration phenomenon of the electromagnetic damper in the prior art due to the constant magnetic field when the moving part tends to stop, and achieving a better restraint effect on the moving part 21.

[0047] Furthermore, in response to the problem in the prior art that the electromagnetic damper and the limit switch cannot work together, resulting in poor limiting effect on the moving parts, in this embodiment, the proximity switch is connected to the electromagnet to detect the magnet, so that the electromagnetic damper can work normally to reduce the speed of the moving part when the moving part has not reached the limit; at the same time, when the moving part reaches the limit, the circuit is controlled by the limit switch, and the function of the electromagnetic damper is stopped, which effectively prevents the moving part from rebounding while stopping the moving part, thereby achieving a better limiting effect on the moving part.

[0048] During the implementation process, Figure 1The illustrated arrangement of an electromagnetic damping limit switch 1 and a moving component 21 is used as an example. In this embodiment, the moving component 21 is a mechanical device that reciprocates along the long axis of a screw 22. The electromagnetic damping limit switch 1 is fixed to a mounting surface (not shown) above the screw 22. A magnet 2 is disposed on the side of the moving component 21 near the electromagnetic damping limit switch 1, with the north pole of the magnet 2 pointing toward the electromagnetic damping limit switch 1. During normal operation, the north pole of the electromagnet 12 in the electromagnetic damping limit switch 1 points toward the moving component 21, and the sensing portion of the proximity switch 11 points toward the screw 22. The electromagnetic damping limit switch 1 is connected to an external DC power supply circuit via two lead wires connected to the positive and negative poles of the DC power supply circuit, respectively. A signal output terminal SIG from the proximity switch is connected to an external signal circuit to control the external circuit, for example, to stop or reverse a motor, generate a limit collision signal, or control the operation of other mechanical equipment. It should be noted that in other embodiments, the south pole of magnet 2 may also point toward electromagnetic damping limit switch 1, and the south pole of electromagnet 12 may point toward magnet 2 during normal operation. This is not further described here. In another embodiment, moving component 21 is a swinging component connected to a drive motor via a rotating shaft. The drive motor drives moving component 21 to reciprocate along a circular line via the rotating shaft. In this case, the electromagnetic damping switch is located at the endpoint of the circular line.

[0049] In a preferred embodiment, Figure 2 As shown, the signal output terminal SIG of the proximity switch 11 outputs a high level when the magnet is not approaching;

[0050] When the proximity switch 11 detects that the magnet 2 has reached the end point, the signal output terminal SIG of the proximity switch 11 outputs a low level;

[0051] The second end of the electromagnet 12 is connected to the negative pole of a first power supply circuit.

[0052] Specifically, in response to the problem in the prior art that the electromagnetic damper will cause the moving part to rebound when the moving part tends to stop due to the constant magnetic field applied to the moving part, in this embodiment, a proximity switch 11 is set to connect the electromagnet 12, so that the electromagnet 12 stops working when the moving part 21 reaches the end point, thereby avoiding the problem of the moving part 21 being affected by the electromagnet 12 and rebounding when it stops, thereby achieving a better restraint effect on the moving part 21.

[0053] During the implementation process, if Figure 2As shown, the proximity switch 11 is connected to the positive and negative poles of the first power supply circuit and a signal circuit; the first end of the electromagnet 12 is connected to the signal output terminal SIG, and the second end of the electromagnet 12 is connected to the negative pole via an adjustable resistor 13. When the proximity switch 11 does not detect the magnet 12, the signal output terminal SIG of the proximity switch 11 continuously outputs a high level. At this time, a potential difference is formed between the signal output terminal SIG and the negative pole, causing a current to flow from the signal output terminal SIG to the negative pole of the electromagnet 12. This causes the coil of the electromagnet 12 to generate a magnetic field, causing the magnet 2 to encounter resistance when approaching the electromagnet 12. When the proximity switch 11 senses the magnet 2, that is, when the moving component 21 drives the magnet 2 to move below the electromagnetic damping limit switch 1, the signal output terminal SIG of the proximity switch 11 outputs a low level, thereby eliminating the current in the coil of the electromagnet 12 and preventing the magnet 2 from rebounding due to the magnetic field.

[0054] In a preferred embodiment, an adjustable resistor 13 is connected between the second end of the electromagnet 12 and the negative electrode of the first power supply circuit.

[0055] Specifically, in order to address the problem that the damping coefficient of the electromagnetic damper in the prior art is constant and cannot be simply adjusted according to actual needs, in this embodiment, an adjustable resistor is connected in series between the second end and the negative pole of the electromagnet 12, and the current value of the current flowing through the electromagnet 12 is adjusted by changing the overall resistance value in the circuit, thereby making the damping coefficient of the electromagnetic damping limit switch 1 adjustable and easy to use.

[0056] As an optional implementation, an adjustable resistor 13 is provided between the first end of the electromagnet 12 and the signal output end SIG.

[0057] In a preferred embodiment, Figure 3 As shown, the signal output terminal SIG is connected to a control terminal of an external first motor 3, and the first motor 3 is used to drive the moving part to move;

[0058] When the control terminal of the first motor 3 is at a low level, the first motor 3 stops rotating.

[0059] Specifically, in order to address the problem in the prior art that the electromagnetic damper and the limit switch cannot work together, resulting in poor restraint effect on the moving parts, this embodiment also connects the signal output end SIG of the electromagnetic damping limit switch 1 to the control end of the first motor 3, so that when the magnetic field of the electromagnet 12 disappears, the rotation of the first motor 3 is stopped, thereby stopping the moving part 21 from moving, thereby achieving a better limiting effect on the moving part 21.

[0060] During the implementation process, if Figure 3As shown, the first motor 3 is connected to the screw 22 and rotates to move the moving part 21. The first motor 3 is configured to rotate when a high level input is input to the control terminal and stop when a low level input is input. When the proximity switch 11 does not detect the magnet 2, the control terminal of the first motor 3 continuously inputs a high level to enable the first motor 3 to operate normally. When the proximity switch 11 detects the magnet 2, the control terminal of the first motor 3 inputs a low level to stop the first motor 3, thereby achieving limit control of the moving part 21.

[0061] In a preferred embodiment, the electromagnetic damping limit switch 1 further comprises a housing, in which an electromagnet 12 and a proximity switch 11 are arranged in parallel;

[0062] The first magnetic pole and the second magnetic pole of the electromagnet 12 are distributed in the horizontal direction in the housing;

[0063] The sensing portion of the proximity switch 11 points downward of the housing.

[0064] Specifically, in order to achieve a better limit damping effect on the moving part 21, in this embodiment, by setting the proximity switch 11 and the electromagnet 12 in the same shell, it is possible to effectively detect whether the magnet 2 has reached the electromagnet 12, and then set this part as the actual limit point of the electromagnetic damping limit switch 1, which is convenient for setting the limit during actual use.

[0065] In a preferred embodiment, the proximity switch 11 is an NPN type normally closed Hall effect device, or a PNP type normally open Hall effect device.

[0066] Specifically, in order to achieve a better control effect on the electromagnet 12, in this embodiment, by setting the proximity switch 11 to an NPN normally closed Hall device, or a PNP normally open Hall device, the proximity switch outputs a high level when the magnet 2 is not detected, and outputs a low level when the magnet 2 is detected, thereby achieving a better control effect on the electromagnet 12.

[0067] In a preferred embodiment, a second adjustable resistor is provided between the first end of the electromagnet and the signal output end.

[0068] Specifically, in response to the problem in the prior art that the magnetic field generated by the electromagnetic damper is constant and the damping coefficient cannot be adjusted, in this embodiment, a second adjustable resistor is set between the first end of the electromagnet and the signal output end to achieve the adjustment of the current value flowing through the electromagnet, thereby making the damping coefficient of the electromagnetic damping limit switch 1 easy to adjust.

[0069] In a preferred embodiment, Figure 4 As shown, the signal output terminal SIG of the proximity switch 11A outputs a low level when the magnet is not approaching;

[0070] When the proximity switch 11A detects that the magnet 2 has reached the end point, the signal output terminal SIG of the proximity switch 11A outputs a high level;

[0071] The second end of the electromagnet 12 is connected to the positive electrode of a second power supply circuit.

[0072] Specifically, in response to the problem in the prior art that the electromagnetic damper will cause the moving part to rebound when the moving part tends to stop due to the constant magnetic field applied to the moving part, in this embodiment, a proximity switch 11A is set to connect the electromagnet 12A, so that the electromagnet 12A stops working when the moving part 21 reaches the end point, thereby avoiding the problem of the moving part 21 being affected by the electromagnet 12A and rebounding when it stops, thereby achieving a better restraint effect on the moving part 21.

[0073] During the implementation process, if Figure 4 As shown, proximity switch 11A is connected to the positive and negative poles of a first power supply circuit and a signal circuit; the first end of electromagnet 12 is connected to signal output terminal SIG, and the second end of electromagnet 12A is connected to the negative pole via adjustable resistor 13A. When proximity switch 11A does not detect magnet 12, signal output terminal SIG of proximity switch 11A continuously outputs a low level. At this time, a potential difference is formed between signal output terminal SIG and the positive pole, causing a current to flow from the positive pole to signal output terminal SIG in electromagnet 12A. This causes the coil of electromagnet 12A to generate a magnetic field, causing magnet 2 to encounter resistance when approaching electromagnet 12. When proximity switch 11A senses magnet 2 (i.e., when moving component 21 drives magnet 2 to move below electromagnetic damping limit switch 1), signal output terminal SIG of proximity switch 11A outputs a low level, eliminating the current in the coil of electromagnet 12A and preventing magnet 2 from rebounding due to the magnetic field.

[0074] In a preferred embodiment, the signal output terminal SIG is connected to a control terminal of an external second motor 3A, and the second motor 3A is used to drive the moving part 21 to move;

[0075] When the control terminal of the second motor 3A is at a high level, the second motor 3A stops rotating.

[0076] In the above embodiment, the proximity switch 11 is an NPN type normally open Hall effect device, or a PNP type normally closed Hall effect device.

[0077] Specifically, in order to address the problem in the prior art that the electromagnetic damper and the limit switch cannot work together, resulting in poor restraint effect on the moving parts, this embodiment also connects the signal output end SIG of the electromagnetic damping limit switch 1 to the control end of the second motor 3A, so that when the magnetic field of the electromagnet 12A disappears, the rotation of the second motor 3A is stopped, thereby stopping the moving part 21 from moving, thereby achieving a better limiting effect on the moving part 21.

[0078] During implementation, the second motor 3A mechanically drives the moving component 21. The second motor 3A is configured to rotate when a low-level input is applied to its control terminal and to stop when a high-level input is applied. When the proximity switch 11A does not detect the magnet 2, the control terminal of the second motor 3A continuously applies a low-level input, allowing the second motor 3A to operate normally. When the proximity switch 11A detects the magnet 2, the control terminal of the second motor 3A applies a high-level input, causing the second motor 3A to stop rotating, thereby achieving position limiting control of the moving component 21.

[0079] The beneficial effect of the present invention is that by providing a proximity switch for detecting magnets and controlling electromagnets, the electromagnetic damping effect on the moving parts is achieved while the electromagnet is controlled, thereby avoiding the problem in the prior art that the electromagnetic damper and the limit switch cannot work together, thereby causing the moving parts to rebound after reaching the limit or failing to correctly trigger the limit switch, thereby achieving a better restraint effect on the moving parts.

[0080] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An electromagnetic damping limit switch, characterized in that: A magnet is pre-arranged on a moving component, wherein a first magnetic pole of the magnet points toward the electromagnetic damping limit switch; The moving component reciprocates along a preset track, and the electromagnetic damping limit switch is arranged at an end point of the preset track; The electromagnetic damping limit switch comprises: an electromagnet, wherein a first magnetic pole of the electromagnet points toward the magnet; a proximity switch, wherein a sensing portion of the proximity switch faces the magnet, a signal output end of the proximity switch is connected to the first end of the electromagnet, and the sensing portion of the proximity switch is closer to the magnet than the first magnetic pole of the electromagnet; When the proximity switch detects that the magnet reaches the end point, the proximity switch controls the electromagnet to stop generating the magnetic field; The signal output terminal of the proximity switch outputs a high level when the magnet is not approaching; When the proximity switch detects that the magnet reaches the end point, the signal output end of the proximity switch outputs a low level; The second end of the electromagnet is connected to the negative pole of a first power supply circuit; The signal output end is connected to a control end of an external first motor, and the first motor is used to drive the moving part to move; When the control terminal of the first motor is at a low level, the first motor stops rotating; The first motor connects the screw to rotate to move the moving part, which is a mechanical device that moves back and forth along the long axis of the screw. The electromagnetic damping limit switch is fixed to the mounting surface above the screw, and the sensing part of the proximity switch points in the direction of the screw.

2. The electromagnetic damping limit switch according to claim 1, characterized in that: An adjustable resistor is connected between the second end of the electromagnet and the negative pole of the first power supply circuit.

3. The electromagnetic damping limit switch according to claim 1, characterized in that: The electromagnetic damping limit switch further comprises a housing, in which the electromagnet and the proximity switch are arranged in parallel; The first magnetic pole and the second magnetic pole of the electromagnet are distributed in the housing along a horizontal direction; The sensing portion of the proximity switch points downward of the housing.

4. The electromagnetic damping limit switch according to claim 1, characterized in that: The proximity switch is an NPN type normally closed Hall effect device, or a PNP type normally open Hall effect device.

5. The electromagnetic damping limit switch according to claim 1, characterized in that: A second adjustable resistor is provided between the first end of the electromagnet and the signal output end.

6. The electromagnetic damping limit switch according to claim 1, characterized in that: The signal output terminal of the proximity switch outputs a low level when the magnet is not approaching; When the proximity switch detects that the magnet reaches the end point, the signal output terminal of the proximity switch outputs a high level; The second end of the electromagnet is connected to the positive pole of a second power supply circuit.

7. The electromagnetic damping limit switch according to claim 6, characterized in that: The signal output end is connected to a control end of an external second motor, and the second motor is used to drive the moving part to move; When the control terminal of the second motor is at a high level, the second motor stops rotating.

8. The electromagnetic damping limit switch according to claim 6, characterized in that: The proximity switch is an NPN type normally open Hall effect device, or a PNP type normally closed Hall effect device.

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