Elevator safety brake

Abstract

The invention discloses an elevator safety brake, comprising a permanent magnet housing with a suspension space inside, a mounting seat fixed in the permanent magnet housing, a moving iron core suspended in the suspension space on one side of the mounting seat, a brake arm arranged corresponding to one end of the moving iron core extending out of the permanent magnet housing, an elastic member that drives the brake arm and the moving iron core to move in a direction close to the mounting seat along the central axis of the permanent magnet housing by elastic force, a coil arranged in the suspension space of the permanent magnet housing and surrounding the outer periphery of the moving iron core, the coil drives the moving iron core and the brake arm to move in a direction away from the mounting seat to overcome the elastic force of the elastic member when powered on; a displacement sensor is arranged on the side of the mounting seat facing the moving iron core, and the displacement sensor is used to measure the movement displacement of the moving iron core relative to the mounting seat. The displacement sensor is arranged on the mounting seat in the permanent magnet housing, and the movement displacement of the moving iron core can be measured, so as to facilitate timely discovery of changes in the reciprocating displacement of the moving iron core.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator brakes, and in particular to an elevator safety brake. Background Art

[0002] The elevator brake is the most important elevator safety protection device, including bracket, coil, moving iron core, moving iron core guide device, brake shoe, brake spring and connecting bolts. The working principle is: when the coil is energized, it generates electromagnetic thrust, which makes the brake shoe separate from the brake disc or wheel on the traction machine. When the coil is de-energized, the electromagnetic force disappears, and under the action of the external brake spring force, the brake shoe acts on the brake disc or wheel on the traction machine, forming a power-off brake.

[0003] A large number of elevator accidents such as top collision, bottoming out, slipping, and even shearing have shown that the elevator brake has the following design defects: during normal operation, the elevator brake moving iron core is stuck on the guide device and cannot be moved. It cannot be opened when it should be opened, and cannot be closed when it should be closed. In particular, it cannot be closed, so the elevator cannot stop when it wants to stop, and accidents such as top collision, bottoming out, slipping, and even shearing will occur. Therefore, it is an urgent problem to be solved by the entire elevator industry to find a method that can effectively prevent the elevator brake moving iron core from getting stuck during opening or closing and monitor the movement displacement of the moving iron core. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the moving iron core of the elevator brake is easily stuck on the guide device during the opening and closing process and the actual movement displacement of the moving iron core cannot be known, thereby providing an elevator safety brake.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] An elevator safety brake, comprising:

[0007] The permanent magnet housing is a cylindrical structure with a suspension space inside;

[0008] A mounting seat, fixed inside the permanent magnet housing;

[0009] A moving iron core is suspended in a suspension space on one side of the mounting seat under the action of the magnetic field of the permanent magnet housing;

[0010] A brake arm is arranged corresponding to one end of the moving iron core extending out of the permanent magnet housing;

[0011] An elastic member, whose elastic force drives the brake arm and the moving iron core to move along the central axis of the permanent magnet housing toward the mounting seat;

[0012] The coil is arranged in the suspension space of the permanent magnet housing and surrounds the outer circumference of the moving iron core, and drives the moving iron core and the brake arm to overcome the elastic force of the elastic member and move along the central axis of the permanent magnet housing in a direction away from the mounting seat when powered on;

[0013] A displacement sensor is mounted on a side of the mounting seat facing the moving iron core and is used to measure the movement displacement of the moving iron core relative to the mounting seat.

[0014] Furthermore, the mounting seat is fixed to the middle part of the permanent magnet housing, and there are two moving iron cores, two coils and two displacement sensors. The two moving iron cores are respectively suspended in the suspension space on both sides of the mounting seat, and the two coils are respectively sleeved on the outer circumference of the corresponding moving iron cores. The two displacement sensors are installed on the opposite sides of the mounting seat and are arranged corresponding to the moving iron cores.

[0015] Furthermore, a groove is provided on the surface of the mounting seat, and the displacement sensor is fixed in the groove.

[0016] Furthermore, the displacement sensor is electrically connected to a display device for displaying motion displacement data measured by the displacement sensor.

[0017] Furthermore, an end cover is fixed to the end of the permanent magnet housing, and the end cover is provided with a through hole opened along the central axis direction of the permanent magnet housing; the moving iron core includes a moving iron core body and a moving iron core connecting shaft connected to the moving iron core body, and the end cover is blocked on the side of the moving iron core body facing away from the mounting seat, and the moving iron core connecting shaft passes through the through hole to be connected to the brake arm.

[0018] Furthermore, the brake arm is connected with an adjusting screw, and the adjusting screw is movably arranged on the brake arm along the movement direction of the moving iron core, and one end of the moving iron core connecting shaft extending out of the end cover is arranged opposite to the adjusting screw.

[0019] Furthermore, it also includes a fixing seat for supporting the permanent magnet housing, the fixing seat is connected to a guide rod arranged in the same direction as the movement direction of the moving iron core, and the guide rod passes through the brake arm; the elastic member is sleeved on the guide rod between the baffle and the brake arm.

[0020] Furthermore, a baffle is provided on the guide rod, and a locking nut is also connected to the guide rod for preventing the baffle from loosening on the guide rod.

[0021] Furthermore, a brake shoe seat is fixedly connected to the brake arm, a brake shoe is fixedly connected to the brake shoe seat, and the brake shoe rubs against the surface of the brake wheel to achieve braking.

[0022] The technical solution of the present invention has the following advantages:

[0023] 1. The elevator safety brake provided by the present invention utilizes the magnetic field generated by the permanent magnet housing to allow the moving iron core to be suspended in the suspension space inside the permanent magnet. Under the action of the magnetic force generated by the coil after being energized and the elastic force of the elastic member itself, the moving iron core can drive the brake arm to reciprocate along the central axis direction of the permanent magnet housing to realize the opening and closing of the elevator brake, thereby eliminating the need to additionally set up a guide device for the moving iron core, and the moving iron core will not get stuck on the guide device, thus avoiding the safety problem caused by the brake arm being unable to achieve elevator braking due to the blocking of the moving iron core. In addition, a displacement sensor is set on the mounting seat in the permanent magnet housing, and the displacement sensor can measure the movement displacement of the moving iron core relative to the mounting seat, so as to facilitate timely detection of changes in the reciprocating displacement of the moving iron core.

[0024] 2. The elevator safety brake provided by the present invention has two moving iron cores, two coils and two displacement sensors. The two moving iron cores can be connected to the two brake arms of the brake respectively, which can shorten the braking stroke of the brake arms and improve the braking reliability.

[0025] 3. In the elevator safety brake provided by the present invention, the displacement sensor is fixed in a groove on the surface of the mounting seat, which can not only save space but also reduce the impact of the moving iron core on the displacement sensor.

[0026] 4. The elevator safety brake provided by the present invention has a display device that can intuitively display the movement displacement of the moving iron core, making it easy to promptly discover changes in the reciprocating displacement of the moving iron core.

[0027] 5. The elevator safety brake provided by the present invention has an end cover that can prevent the moving iron core from moving out of the suspension space in the permanent magnet housing, thereby improving the overall stability.

[0028] 6. The elevator safety brake provided by the present invention can adjust the distance between the screw and the connecting shaft of the moving iron core when the coil is powered off.

[0029] 7. In the elevator safety brake provided by the present invention, the guide rod serves as a motion guide for the brake arm, thereby preventing the brake arm from deflecting during movement.

[0030] 8. In the elevator safety brake provided by the present invention, the elastic member is connected between the baffle and the brake arm, and the baffle is locked with a locking nut to prevent the influence of the braking force applied by the elastic member due to the loosening of the baffle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the structure of an elevator safety brake provided by an embodiment of the present invention;

[0033] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0034] Explanation of the accompanying drawings: 1. permanent magnet housing; 2. mounting seat; 3. moving iron core; 31. moving iron core body; 32. moving iron core connecting shaft; 4. brake arm; 5. elastic member; 6. coil; 7. displacement sensor; 8. end cover; 9. adjusting screw; 10. fixing seat; 11. guide rod; 12. baffle; 13. anti-loosening nut; 14. brake shoe seat; 15. brake shoe; 16. brake wheel. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below 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 creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] like Figure 1 and Figure 2 The elevator safety brake shown in the figure comprises a permanent magnet housing 1, a mounting seat 2, a moving iron core 3, an elastic member 5, a coil 6, a displacement sensor 7 and a brake arm 4; wherein the permanent magnet housing 1 is a cylindrical structure having a suspension space inside, and end covers 8 are connected to the two ends in the axial direction thereof. The mounting seat 2 is fixed inside the permanent magnet housing 1 and separates the suspension space. The moving iron core 3 is suspended in the suspension space on one side of the mounting seat 2 under the action of the magnetic field of the permanent magnet housing 1, and the brake arm 4 is arranged corresponding to the end of the moving iron core 3 extending out of the permanent magnet housing 1. One end of the elastic member 5 is fixed and the other end is connected to the brake arm 4, and its elastic force drives the brake arm 4 and the moving iron core 3 to move along the central axis of the permanent magnet housing 1 in the direction close to the mounting seat 2. The coil 6 is fixed on the end cover 8 and arranged in the suspension space of the permanent magnet housing 1. The coil 6 surrounds the outer circumference of the moving iron core 3. When the coil 6 is powered on, it drives the moving iron core 3 to move. During the movement of the moving iron core 3, the brake arm 4 is driven to overcome the elastic force of the elastic member 5 and move along the central axis of the permanent magnet housing 1 in a direction away from the mounting seat 2. The displacement sensor 7 is installed on the side of the mounting seat 2 facing the moving iron core 3, and is used to measure the movement displacement of the moving iron core 3 relative to the mounting seat 2. The brake arm 4 is fixedly connected to a brake shoe seat 14, and the brake shoe seat 14 is fixedly connected to a brake shoe 15. The brake shoe 15 and the brake wheel 16 are rubbed against each other to achieve braking.

[0040] This elevator safety brake utilizes the magnetic field generated by the permanent magnet housing 1 to allow the moving iron core 3 to be suspended in the suspension space inside the permanent magnet. Under the action of the magnetic force generated by the coil 6 after being energized and the elastic force of the elastic member 5 itself, the moving iron core 3 can drive the brake arm 4 to reciprocate along the central axis direction of the permanent magnet housing 1 to achieve the opening and closing of the elevator brake, thereby eliminating the need to additionally set a guide device for the moving iron core 3. The moving iron core 3 will not get stuck on the guide device, thus avoiding the safety problem caused by the brake arm 4 being unable to achieve elevator braking due to the blocking of the moving iron core 3. In addition, a displacement sensor 7 is provided on the mounting seat 2 in the permanent magnet housing 1. The displacement sensor 7 can measure the movement displacement of the moving iron core 3 relative to the mounting seat 2, so as to facilitate timely detection of changes in the reciprocating displacement of the moving iron core 3.

[0041] In this embodiment, the mounting seat 2 is fixed to the middle of the permanent magnet housing 1, and there are two moving iron cores 3, two coils 6 and two displacement sensors 7. The two moving iron cores 3 are suspended in the suspension spaces on both sides of the mounting seat 2, and the two coils 6 are respectively sleeved on the outer periphery of the corresponding moving iron cores 3. The two displacement sensors 7 are installed on the opposite sides of the mounting seat 2 and are arranged corresponding to the moving iron cores 3. There are two moving iron cores 3, two coils 6 and two displacement sensors 7, and the two moving iron cores 3 can be connected to the two brake arms 4 of the brake, respectively, which can shorten the braking stroke of the brake arms 4 and improve the braking reliability.

[0042] like Figure 2 As shown, in this embodiment, a groove is provided on the surface of the mounting seat 2, and the displacement sensor 7 is fixed in the groove, which can not only save space but also reduce the impact of the moving iron core 3 on the displacement sensor 7.

[0043] In this embodiment, the displacement sensor 7 is electrically connected to a display device for displaying the motion displacement data measured by the displacement sensor 7. The display device can intuitively display the motion displacement of the moving iron core 3, so as to timely discover the change of the reciprocating motion displacement of the moving iron core 3.

[0044] In this embodiment, the end cover 8 is provided with a through hole opened along the central axis direction of the permanent magnet housing 1; the moving iron core 3 includes a moving iron core body 31 and a moving iron core connecting shaft 32 connected to the moving iron core body 31, the end cover 8 blocks the side of the moving iron core body 31 facing away from the mounting seat 2, and the moving iron core connecting shaft 32 passes through the through hole and is connected to the brake arm 4. The end cover 8 can prevent the moving iron core 3 from moving out of the suspension space in the permanent magnet housing 1, thereby improving the overall stability.

[0045] In this embodiment, the brake arm 4 is connected with an adjusting screw 9, which is movably arranged on the brake arm 4 along the moving direction of the moving iron core 3, and one end of the moving iron core connecting shaft 32 extending out of the end cover 8 is arranged corresponding to the adjusting screw 9. When the coil 6 is powered off, the distance between the adjusting screw 9 and the moving iron core connecting shaft 32 can be adjusted.

[0046] In this embodiment, the elevator safety brake further includes a fixing seat 10 for supporting the permanent magnet housing 1, the fixing seat 10 is connected with a guide rod 11 arranged in the same direction as the moving direction of the moving iron core 3, and the guide rod 11 passes through the brake arm 4; the elastic member 5 is sleeved on the guide rod 11 between the baffle 12 and the brake arm 4. The elastic member 5 is specifically a compression spring. The guide rod 11 plays a role in guiding the movement of the brake arm 4 to prevent the brake arm 4 from deflecting during the movement.

[0047] In this embodiment, a baffle 12 is provided on the guide rod 11, and a locking nut 13 is also connected to the guide rod 11 for preventing the baffle 12 from loosening on the guide rod 11. The guide rod 11 guides the brake arm 4 to prevent the brake arm 4 from deflecting during movement.

[0048] In this embodiment, a baffle plate 12 is provided on the guide rod 11, and a locking nut 13 is also connected to the guide rod 11 to prevent the baffle plate 12 from loosening on the guide rod 11. The elastic member 5 is connected between the baffle plate 12 and the brake arm 4, and the baffle plate 12 is locked by the locking nut 13, which can prevent the influence of the braking force applied by the elastic member 5 due to the loosening of the baffle plate 12.

[0049] In summary, this elevator safety brake utilizes the magnetic field generated by the permanent magnet housing 1 to allow the moving iron core 3 to be suspended in the suspension space inside the permanent magnet. Under the action of the magnetic force generated by the coil 6 after being energized and the elastic force of the elastic member 5 itself, the moving iron core 3 can drive the brake arm 4 to reciprocate along the central axis direction of the permanent magnet housing 1 to achieve the opening and closing of the elevator brake, thereby eliminating the need to additionally set a guide device for the moving iron core 3. The moving iron core 3 will not get stuck on the guide device, thus avoiding the safety problem caused by the brake arm 4 being unable to achieve elevator braking due to the blocking of the moving iron core 3. In addition, a displacement sensor 7 is provided on the mounting seat 2 in the permanent magnet housing 1. The displacement sensor 7 can measure the movement displacement of the moving iron core 3 relative to the mounting seat 2, so as to facilitate timely detection of changes in the reciprocating displacement of the moving iron core 3.

[0050] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An elevator safety brake, characterized in that: include: The permanent magnet housing (1) is a cylindrical structure with a suspension space inside; A mounting seat (2) fixed inside the permanent magnet housing (1); A moving iron core (3) is suspended in a suspension space on one side of the mounting seat (2) under the action of the magnetic field of the permanent magnet housing (1); A brake arm (4) is arranged corresponding to an end of the moving iron core (3) extending out of the permanent magnet housing (1); An elastic member (5), whose elastic force drives the brake arm (4) and the moving iron core (3) to move along the central axis of the permanent magnet housing (1) in a direction close to the mounting seat (2); The coil (6) is arranged in the suspension space of the permanent magnet housing (1) and surrounds the outer circumference of the moving iron core (3), and drives the moving iron core (3) and the brake arm (4) to overcome the elastic force of the elastic member (5) and move along the central axis of the permanent magnet housing (1) in a direction away from the mounting seat (2) when powered on; A displacement sensor (7), mounted on a side of the mounting seat (2) facing the moving iron core (3), and used to measure the movement displacement of the moving iron core (3) relative to the mounting seat (2); The mounting seat (2) is fixed to the middle of the permanent magnet housing (1); the moving iron core (3), the coil (6) and the displacement sensor (7) are each provided with two moving iron cores (3); the two moving iron cores (3) are respectively suspended in the suspension space on both sides of the mounting seat (2); the two coils (6) are respectively sleeved on the outer circumference of the corresponding moving iron cores (3); and the two displacement sensors (7) are installed on opposite sides of the mounting seat (2) and are arranged corresponding to the moving iron cores (3); The surface of the mounting seat (2) is provided with a groove, and the displacement sensor (7) is fixed in the groove.

2. The elevator safety brake according to claim 1, characterized in that: The displacement sensor (7) is electrically connected to a display device for displaying the motion displacement data measured by the displacement sensor (7).

3. The elevator safety brake according to claim 1, characterized in that: An end cover (8) is fixed to the end of the permanent magnet housing (1), and a through hole is provided on the end cover (8) along the central axis direction of the permanent magnet housing (1); the moving iron core (3) comprises a moving iron core body (31) and a moving iron core connecting shaft (32) connected to the moving iron core body (31), the end cover (8) blocks a side of the moving iron core body (31) facing away from the mounting seat (2), and the moving iron core connecting shaft (32) passes through the through hole and is connected to the brake arm (4).

4. The elevator safety brake according to claim 3, characterized in that: The brake arm (4) is connected to an adjusting screw (9), and the adjusting screw (9) is movably arranged on the brake arm (4) along the movement direction of the moving iron core (3). One end of the moving iron core connecting shaft (32) protrudes from the end cover (8) and is arranged opposite to the adjusting screw (9).

5. The elevator safety brake according to claim 1, characterized in that: It also comprises a fixing seat (10) for supporting the permanent magnet housing (1), the fixing seat (10) being connected to a guide rod (11) arranged in the same direction as the moving direction of the moving iron core (3), the guide rod (11) passing through the brake arm (4).

6. The elevator safety brake according to claim 5, characterized in that: The guide rod (11) is provided with a baffle (12), and the elastic member (5) is sleeved on the guide rod (11) between the baffle (12) and the brake arm (4); the guide rod (11) is also connected with a locking nut (13) for preventing the baffle (12) from loosening on the guide rod (11).

7. The elevator safety brake according to claim 1, characterized in that: The brake arm (4) is fixedly connected with a brake shoe seat (14), the brake shoe seat (14) is fixedly connected with a brake shoe (15), and the brake shoe (15) and the surface of the brake wheel (16) are rubbed against each other to achieve braking.

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