Elevator safety brake

Abstract

The utility model discloses an elevator safety brake. Comprising a base, two brake arms, brake linings and brake shoes, wherein the two brake arms are symmetrically arranged left and right and are respectively hinged to the base; the brake linings are respectively mounted on the inner sides of the two brake arms and are used for holding a brake wheel; the brake shoes are arranged on the inner sides of the brake linings and are used for being in contact with the peripheral surface of the brake wheel; the driving mechanism is used for driving the two brake arms to be closed and opened; a plurality of dovetail grooves extending in the axial direction are formed in the inner arc face of the brake lining, the brake shoe comprises an arc-shaped base plate and a brake piece arranged on the inner arc face of the arc-shaped base plate, and a plurality of dovetail tenons matched with the dovetail grooves in a one-to-one inserting mode are arranged on the outer arc face of the arc-shaped base plate. One end of the arc-shaped base plate is provided with a connecting piece which is turned outwards, and the connecting piece is fixed to one side end of the brake lining through a screw. According to the utility model, the brake shoe is more convenient to disassemble and replace.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator parts, and particularly relates to an elevator safety brake. Background Art

[0002] The elevator brake is an important safety device for elevators. Its function is to automatically stop the car when the power supply of the running elevator is cut off. When the elevator stops running, the brake should be able to keep the car stationary and in place under 125% of the rated load. When the power supply of the elevator's power source or control circuit is de-energized, the brake should be immediately braked.

[0003] The working principle of the elevator brake is as follows: When the elevator is in a stationary state, there is no current passing through the coils of the traction motor and the electromagnetic elevator brake. At this time, since there is no attraction between the electromagnet cores, the brake shoe is held tightly against the brake wheel under the action of the brake spring pressure, ensuring that the motor does not rotate. When the traction motor starts to rotate after being energized, the coils in the brake electromagnet are simultaneously energized, and the electromagnet cores are quickly magnetized and attracted, driving the brake arm so that the brake spring is under force, and the brake shoe opens and completely disengages from the brake wheel, allowing the elevator to operate. When the elevator car reaches the required stop, the traction motor is de-energized, and the coils in the brake electromagnet are also de-energized at the same time. The magnetic force in the electromagnet core quickly disappears, and the core is reset through the brake arm under the action of the brake spring, causing the brake shoe to hold the brake wheel again, and the elevator stops working.

[0004] Since the elevator brake brakes through the friction between the brake shoe and the brake wheel, during the braking process, the brake shoe will wear and needs to be replaced regularly. The existing brake requires the brake arm to be opened before the brake shoe can be disassembled and replaced, and the disassembly and replacement of the brake shoe are relatively troublesome. Content of the Utility Model

[0005] Aiming at the defects in the prior art, the utility model provides an elevator safety brake to make the disassembly and replacement of the brake shoe more convenient.

[0006] The utility model provides an elevator safety brake, which includes a base, two brake arms symmetrically arranged on the left and right and respectively hinged to the base, brake linings respectively installed on the inner sides of the two brake arms and used for clamping the brake wheel, brake shoes arranged on the inner sides of the brake linings and used for contacting the outer peripheral surface of the brake wheel, and a driving mechanism used for driving the two brake arms to clamp and open.

[0007] The inner arc surface of the brake lining is provided with a plurality of dovetail grooves extending axially. The brake shoe includes an arc-shaped base plate and a brake pad provided on the inner arc surface of the arc-shaped base plate. The outer arc surface of the arc-shaped base plate is provided with a plurality of dovetail tenons that are inserted and matched with the dovetail grooves one by one. One end of the arc-shaped base plate is provided with a connecting piece that turns outwards, and the connecting piece is fixed to one side end of the brake lining by screws.

[0008] Further, there are three dovetail grooves, which are respectively located at the upper, middle, and lower parts of the inner arc surface of the brake lining, and there are also three corresponding dovetail tenons.

[0009] Further, there are two screws, which are respectively connected to the positions between the dovetail grooves at the side end of the brake lining.

[0010] Further, the brake lining is fixed to the middle part of the brake arm by a pin shaft.

[0011] Further, the driving mechanism includes a triangular lever, a connecting rod, a tension spring, and a pusher. One angle at the lower part of the triangular lever is hinged to the upper end of one brake arm. One end of the connecting rod is hinged to the upper end of the other brake arm, and the other end of the connecting rod is hinged to one angle at the upper part of the triangular lever. The upper end of the tension spring is connected to the side of the lower part of the triangular lever away from the brake arm, and the lower end of the tension spring is connected to the base. The upper end of the pusher is hinged to the side of the lower part of the triangular lever away from the brake arm, and the lower end of the pusher is hinged to the base.

[0012] Further, the connecting rod includes a first connecting rod section, a second connecting rod section, and a threaded connecting sleeve connected between the first connecting rod section and the second connecting rod section. The opposite ends of the first connecting rod section and the second connecting rod section are provided with external threads with opposite helix directions, and the two ends of the threaded connecting sleeve are respectively connected to the external threads on the first connecting rod section and the second connecting rod section.

[0013] Further, the pusher is an electromagnetic pusher.

[0014] Further, the tension spring is arranged between the brake arm and the pusher.

[0015] The beneficial effects of the present utility model are reflected in that:

[0016] When disassembling and replacing the brake shoe, the screws on the connecting piece of the brake shoe can be unscrewed, and then a tool such as a flat screwdriver is used to pry the connecting piece of the brake shoe so that the connecting piece is separated from the side end of the brake lining. Then, the brake shoe can be pulled out from the brake lining through the connecting piece. When installing the brake shoe, the dovetail tenon of the brake shoe is aligned and snapped into the dovetail groove on the brake lining from the side end, and then the connecting piece is fixed to the side end of the brake lining by screws. Therefore, when replacing the brake shoe in the above manner, it can be completed without opening the brake arm, and the disassembly and replacement of the brake shoe are more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally denoted by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 A perspective view of an embodiment of the present invention;

[0019] Figure 2 A front view of an embodiment of the present invention;

[0020] Figure 3 A sectional view showing the dovetail groove of the brake lining and the dovetail tenon of the brake shoe in an embodiment of the present invention;

[0021] Figure 4 A schematic structural view of the brake lining in an embodiment of the present invention;

[0022] Figure 5 A schematic structural view of the brake pad in an embodiment of the present invention.

[0023] In the drawings, 100 - base; 200 - brake arm; 300 - brake lining; 310 - dovetail groove; 400 - brake shoe; 410 - arc-shaped substrate; 411 - dovetail tenon; 412 - connecting piece; 420 - brake pad; 430 - screw; 500 - driving mechanism; 510 - triangular lever; 520 - connecting rod; 521 - first connecting rod segment; 522 - second connecting rod segment; 523 - threaded connecting sleeve; 530 - tension spring; 540 - pusher; 600 - brake wheel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will describe in detail the embodiments of the technical solutions of the present invention with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and thus are only examples and cannot be used to limit the protection scope of the present invention.

[0025] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meanings understood by those skilled in the art to which the present invention belongs.

[0026] As Figures 1 - 5As shown in the figure, an embodiment of the present utility model provides an elevator safety brake, which includes a base 100, two brake arms 200 symmetrically arranged on the left and right and respectively hinged to the base 100, brake linings 300 respectively installed on the inner sides of the two brake arms 200 and used for clamping the brake wheel 600, brake shoes 400 arranged on the inner sides of the brake linings 300 and used for contacting the outer peripheral surface of the brake wheel 600, and a driving mechanism 500 used for driving the two brake arms 200 to clamp and open.

[0027] Referring to Figures 3 - 5 , a plurality of axially extending dovetail grooves 310 are provided on the inner arc surface of the brake lining 300. The brake shoe 400 includes an arc-shaped substrate 410 and a brake pad 420 arranged on the inner arc surface of the arc-shaped substrate 410. A plurality of dovetail tenons 411 that are in one-to-one plug-in fit with the respective dovetail grooves 310 are provided on the outer arc surface of the arc-shaped substrate 410. In order to ensure that the brake shoe 400 is firmly combined with the brake lining 300, three dovetail grooves 310 are specifically provided, which are respectively located at the upper, middle, and lower parts of the inner arc surface of the brake lining 300, and three corresponding dovetail tenons 411 are also provided.

[0028] One end of the arc-shaped substrate 410 is provided with a turned-out connecting piece 412, and the connecting piece 412 is fixed to one side end of the brake lining 300 by screws 430. In this embodiment, specifically two screws 430 are provided, which are respectively connected to the positions between the dovetail grooves 310 at the side end of the brake lining 300.

[0029] Referring to Figure 1 and Figure 2 , the brake lining 300 is fixed to the middle of the brake arm 200 by a pin shaft. The brake lining 300 can be adjusted with a small swing relative to the brake arm 200 so that the brake pad 420 fits the brake wheel 600.

[0030] Continuing to refer to Figure 1 and Figure 2 , the driving mechanism 500 includes a triangular lever 510, a connecting rod 520, a tension spring 530, and a pusher 540. One corner at the lower part of the triangular lever 510 is hinged to the upper end of a brake arm 200. One end of the connecting rod 520 is hinged to the upper end of the other brake arm 200, and the other end of the connecting rod 520 is hinged to one corner at the upper part of the triangular lever 510. The upper end of the tension spring 530 is connected to the side of the triangular lever 510 away from the brake arm 200 at the lower part, and the lower end of the tension spring 530 is connected to the base 100. The upper end of the pusher 540 is hinged to the side of the triangular lever 510 away from the brake arm 200 at the lower part, and the lower end of the pusher 540 is hinged to the base 100. The pusher 540 is preferably an electromagnetic pusher 540.

[0031] When power is turned on, the electromagnet core in the electromagnetic pusher 540 is rapidly magnetized and attracted, driving the push rod of the electromagnetic pusher 540 to extend, and the push rod of the electromagnetic pusher 540 pushes the end of the triangular lever 510 away from the brake arm 200 to tilt upward, and the triangular lever 510 and the connecting rod 520 open the two brake arms 200, so that the brake shoes 400 on the two brake arms 200 are separated from the brake wheel 600, and the brake is released, and the elevator can operate normally. When power is off, the attraction between the electromagnet cores in the electromagnetic pusher 540 is disconnected, and the tension spring 530 pulls the end of the triangular lever 510 away from the brake arm 200 to rotate downward, driving the two brake arms 200 to rotate toward the middle and hold the brake wheel 600 tightly, thereby realizing the power-off braking of the elevator.

[0032] The tension spring 530 of this embodiment is disposed between the brake arm 200 and the pusher 540 , so that the pusher 540 pushes the two brake arms 200 to open and release the brake more labor-saving.

[0033] Preferably, the connecting rod 520 includes a first connecting rod section 521, a second connecting rod section 522, and a threaded connection sleeve 523 connected between the first connecting rod section 521 and the second connecting rod section 522. The opposite ends of the first connecting rod section 521 and the second connecting rod section 522 are provided with external threads with opposite rotation directions, and the two ends of the threaded connection sleeve 523 are respectively connected to the external threads on the first connecting rod section 521 and the second connecting rod section 522. By setting the connecting rod 520 in two sections, the two sections of the connecting rod 520 can be disconnected, so as to facilitate opening of the two brake arms 200. At the same time, the length of the connecting rod 520 can be adjusted by rotating the threaded connection sleeve 523, thereby adjusting the gap between the brake shoe 400 and the brake wheel 600.

[0034] When disassembling and replacing the brake shoe 400, the screws 430 on the connecting plate 412 of the brake shoe 400 can be unscrewed, and then the connecting plate 412 of the brake shoe 400 can be pried with a tool such as a flat-blade screwdriver to separate the connecting plate 412 from the side end of the brake lining 300, and then the brake shoe 400 can be pulled out from the brake lining 300 through the connecting plate 412. When installing the brake shoe 400, align the dovetail tenon 411 of the brake shoe 400 from the side end and insert it into the dovetail groove 310 on the brake lining 300, and then fix the connecting plate 412 to the side end of the brake lining 300 with the screws 430. Therefore, when replacing the brake shoe 400 in the above manner, it is not necessary to open the brake arm 200, and the disassembly and replacement of the brake shoe 400 is more convenient.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention, and they should all be covered by the scope of the claims and the specification of the present invention.

Claims

1. An elevator safety brake, comprising a base, two brake arms symmetrically arranged and respectively hinged on the base, brake linings respectively installed on the inner sides of the two brake arms and used to engage with a brake wheel, brake shoes arranged on the inner sides of the brake linings and used to contact with the outer peripheral surface of the brake wheel, and a driving mechanism for driving the two brake arms to engage and open, characterized in that: The inner arc surface of the brake lining is provided with a plurality of dovetail grooves extending axially, the brake shoe includes an arc-shaped base plate and a brake shoe arranged on the inner arc surface of the arc-shaped base plate, the outer arc surface of the arc-shaped base plate is provided with a plurality of dovetail tenons which are plugged into and matched with each of the dovetail grooves, and one end of the arc-shaped base plate is provided with an outwardly turned connecting plate, and the connecting plate is fixed to one side end of the brake lining by screws.

2. The elevator safety brake according to claim 1, characterized in that: There are three dovetail grooves, which are respectively located at the upper part, the middle part and the lower part of the inner arc surface of the brake lining, and there are also three corresponding dovetail tenons.

3. The elevator safety brake according to claim 2, characterized in that: There are two screws, which are respectively connected to the side ends of the brake lining between the dovetail grooves.

4. The elevator safety brake according to claim 1, characterized in that: The brake lining is fixed to the middle part of the brake arm through a pin shaft.

5. The elevator safety brake according to claim 1, characterized in that: The driving mechanism includes a triangular lever, a connecting rod, a tension spring and a pusher, wherein an angle of the lower portion of the triangular lever is hinged to the upper end of one of the brake arms, one end of the connecting rod is hinged to the upper end of the other brake arm, the other end of the connecting rod is hinged to an angle of the upper portion of the triangular lever, the upper end of the tension spring is connected to a side of the lower portion of the triangular lever away from the brake arm, the lower end of the tension spring is connected to a base, the upper end of the pusher is hinged to a side of the lower portion of the triangular lever away from the brake arm, and the lower end of the pusher is hinged to the base.

6. The elevator safety brake according to claim 5, characterized in that: The connecting rod includes a first connecting rod segment, a second connecting rod segment and a threaded connecting sleeve connected between the first connecting rod segment and the second connecting rod segment. The opposite ends of the first connecting rod segment and the second connecting rod segment are provided with external threads with opposite rotation directions. The two ends of the threaded connecting sleeve are respectively connected to the external threads on the first connecting rod segment and the second connecting rod segment.

7. The elevator safety brake according to claim 5, characterized in that: The pusher is an electromagnetic pusher.

8. The elevator safety brake according to claim 5, characterized in that: The tension spring is arranged between the brake arm and the pusher.

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