Elevator speed limiting safety tongs

Abstract

The utility model discloses a pair of speed-limiting safety tongs for an elevator. The speed-limiting safety tongs comprise a base and a safety tongs main body arranged on the base, the base is used for being fixed to an elevator car. The safety tongs body comprises a shell and two sets of tongs bodies arranged in the shell. The shell is arranged on the base, lower supporting plates are fixed to the two sides of the lower end of the shell, upper supporting plates are arranged above the lower supporting plates, spring shock absorbers are supported between the lower supporting plates and the upper supporting plates, and the upper supporting plates are connected to the base through pull rods; the clamp body comprises a guide block transversely installed in the shell in a sliding mode, an elastic buffering piece supported between the outer side of the guide block and the shell, a rail fixed to the inner side of the guide block and provided with the lower end inclining outwards, and a wedge block installed on the inner side of the rail in a sliding mode. And a channel through which a guide rail of an elevator passes is formed between the wedge blocks of the two groups of clamp bodies. The braking stroke of the safety clamp can be increased, and the buffering effect of braking is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator components, and particularly relates to an elevator speed limiter safety tongs. Background Art

[0002] The elevator safety tongs are one of the important safety components of an elevator. Its main function is to urgently stop the elevator car through braking friction with the guide rail in abnormal situations such as elevator overspeed and out of control, so as to prevent the car from falling and ensure the safety of passengers and equipment. The safety tongs are usually installed on the car frame or counterweight frame. When the speed of the elevator reaches the set trigger value, the safety tongs will be activated and act quickly, tightly clamping the guide rail to stop the elevator from running.

[0003] At present, most of the safety tongs for medium and high-speed elevators are of progressive braking. For example, the Chinese utility model patent CN213059760U discloses a progressive elevator safety tongs. In abnormal situations such as elevator overspeed and out of control, the speed limiter locks and pulls the wedge block. The wedge block slides upward relative to the guide plate and is clamped on the guide rail under the action of the guide plate. Since the outer side of the guide block is supported on the U-shaped leaf spring, after the wedge block is clamped on the guide rail, it will continue to slide upward relative to the guide plate, thus playing a buffering role in the braking of the car.

[0004] However, when the existing elevator safety tongs brake, they can only be buffered by the U-shaped leaf spring on the outer side of the guide block, the braking stroke is short, and the buffering effect is poor. Summary of the Utility Model

[0005] Aiming at the defects in the prior art, the utility model provides an elevator speed limiter safety tongs to increase the braking stroke of the safety tongs and improve the buffering effect of braking.

[0006] The utility model provides an elevator speed limiter safety tongs, which includes a base and a safety tongs main body installed on the base;

[0007] The base is used for being fixed on the elevator car;

[0008] The safety tongs main body includes a housing and two groups of tong bodies symmetrically arranged on the left and right in the housing;

[0009] The housing is arranged on the base. Lower support plates are fixed on both sides of the lower end of the housing. An upper support plate is arranged above the lower support plates. A spring damper is supported between the lower support plates and the upper support plate. The upper support plate is connected to the base through a pull rod;

[0010] The pliers body includes a guide block slidably mounted horizontally in the housing, an elastic buffer supported between the outer side of the guide block and the housing, a track fixed to the inner side of the guide block and inclined outward at the lower end, and a wedge block slidably mounted inside the track. A channel through which the guide rail of the elevator passes is formed between the wedge blocks of the two pliers bodies.

[0011] Further, the lower end of the pull rod is fixed to the base. Perforations are provided on both the lower support plate and the upper support plate. The pull rod passes through the perforations on the lower support plate and the upper support plate in sequence, and a nut locked to the upper side of the upper support plate is connected to the upper end of the pull rod.

[0012] Further, positioning heads are provided at both the upper and lower ends of the spring damper. Positioning sleeves are provided on the upper side of the lower support plate and the lower side of the upper support plate. The positioning sleeves at both ends of the spring damper are respectively inserted into the corresponding positioning sleeves.

[0013] Further, protective covers covering the lower support plate, the upper support plate and the spring damper on the corresponding sides are provided on both sides of the housing.

[0014] Further, the upper end of the protective cover is fixed to the housing by screws.

[0015] Further, the track is fixed to the guide block by bolts, and the inclined lower end of the track extends downward out of the bottom of the housing.

[0016] Further, the elastic buffer is a disc spring.

[0017] Further, a traction piece is further included. The traction piece is arranged at the rear side of the wedge block. Two transverse holes are symmetrically arranged left and right on the traction piece. The two wedge blocks are respectively connected to the corresponding transverse holes through sliding shafts. A traction rod passing upward through the top of the housing is provided in the middle of the traction piece.

[0018] The beneficial effects of the present utility model are reflected in:

[0019] In abnormal situations such as elevator overspeed and out-of-control, the speed limiter locks and pulls the two-sided wedge blocks. The two-sided wedge blocks slide upward relative to the track, and under the action of the inclined track, they are squeezed toward the middle and clamped on both sides of the elevator guide rail, thereby performing braking. During the braking process, the wedge blocks will continue to slide upward relative to the track, causing the two-sided wedge blocks to respectively extrude the two-sided tracks outward. The two-sided elastic buffers are elastically extruded, thereby buffering the braking. At the same time, the base descends together with the elevator car, and the base pulls the upper support plate to move downward relative to the lower support plate through the pull rod, thereby squeezing the spring damper, which can also buffer the braking.

[0020] By combining two braking buffer methods, the present application increases the buffering stroke of braking, achieves a better buffering effect, and thus reduces the harm to the passengers in the elevator car during the emergency braking of the elevator safety tongs. Description of the Drawings

[0021] 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 use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0022] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0023] Figure 2 is Figure 1 A - A cross-sectional view of;

[0024] Figure 3 It is a schematic structural diagram of the traction piece of an embodiment of the present invention.

[0025] In the drawings, 100 - base; 110 - pull rod; 111 - nut; 200 - housing; 210 - lower support plate; 220 - protective cover; 300 - upper support plate; 400 - spring shock absorber; 410 - positioning head; 420 - positioning sleeve; 500 - guide block; 600 - elastic buffer; 700 - track; 800 - wedge block; 900 - traction piece; 910 - transverse hole; 920 - traction rod. Detailed Description of the Embodiments

[0026] The following will describe in detail the embodiments of the technical solutions of the present invention in conjunction with 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.

[0027] It should be noted that unless otherwise specified, the technical terms or scientific terms used in the present application should have the ordinary meaning understood by those skilled in the art to which the present invention belongs.

[0028] As Figures 1 - 3 shown, an embodiment of the present invention provides an elevator speed limiter safety tongs, including a base 100 and a safety tongs main body installed on the base 100.

[0029] The base 100 is used for fixing on the elevator car.

[0030] The safety tongs main body includes a housing 200 and two groups of tong bodies symmetrically arranged on the left and right inside the housing 200.

[0031] The housing 200 is disposed on the base 100. Lower support plates 210 are fixedly provided on both sides at the lower end of the housing 200. An upper support plate 300 is provided above the lower support plates 210. A spring damper 400 is supported between the lower support plates 210 and the upper support plate 300. The upper support plate 300 is connected to the base 100 through a pull rod 110.

[0032] In this embodiment, referring to Figure 3 , the lower end of the pull rod 110 is fixed on the base 100. Through holes are provided on both the lower support plates 210 and the upper support plate 300. The pull rod 110 sequentially passes through the through holes on the lower support plates 210 and the upper support plate 300. A nut 111 locked on the upper side of the upper support plate 300 is connected to the upper end of the pull rod 110.

[0033] Positioning heads 410 are provided at both the upper and lower ends of the spring damper 400. Positioning sleeves 420 are provided on the upper side of the lower support plates 210 and the lower side of the upper support plate 300. The positioning sleeves 420 at both ends of the spring damper 400 are respectively inserted into the corresponding positioning sleeves 420.

[0034] Protective covers 220 covering the corresponding lower support plates 210, upper support plates 300 and spring dampers 400 are further provided on both sides of the housing 200. The upper ends of the protective covers 220 can be fixed on the housing 200 by screws.

[0035] When assembling the spring damper 400, first embed the positioning head 410 at the lower end of the spring damper 400 into the positioning sleeve 420 on the lower support plate 210, then sequentially pass the pull rod 110 on the base 100 through the through holes on the lower support plate 210 and the upper support plate 300, and then tighten the nut 111 at the upper end of the pull rod 110 until the positioning head 410 at the upper end of the spring damper 400 is embedded into the positioning sleeve 420 on the lower side of the upper support plate 300 and the spring damper 400 is tightened. Finally, install the protective cover 220.

[0036] The pliers body includes a guide block 500 slidably mounted horizontally in the housing 200, an elastic buffer 600 supported between the outer side of the guide block 500 and the housing 200, a rail 700 fixed to the inner side of the guide block 500 and inclined outward at the lower end, and a wedge block 800 slidably mounted inside the rail 700. A channel through which the guide rail of the elevator passes is formed between the wedge blocks 800 of the two pliers bodies.

[0037] In this embodiment, the rail 700 is specifically fixed to the guide block 500 by bolts. The inclined lower end of the rail 700 extends downward out of the bottom of the housing 200.

[0038] In this embodiment, the elastic buffer 600 is preferably a disc spring.

[0039] This embodiment further includes a traction sheet 900. The traction sheet 900 is disposed at the rear side of the wedge block 800. Two transverse holes 910 are symmetrically arranged on the left and right of the traction sheet 900. The two wedge blocks 800 are respectively connected to the corresponding transverse holes 910 through sliding shafts. A traction rod 920 that penetrates upward through the top of the housing 200 is provided in the middle of the traction sheet 900. In this way, two wedge blocks 800 can be simultaneously pulled upward by a pull rod 110.

[0040] In the event of abnormal situations such as elevator overspeed and out of control, the speed limiter locks and holds the two wedge blocks 800 on both sides. The two wedge blocks 800 slide upward relative to the track 700, and under the action of the inclined track 700, they are squeezed toward the middle and clamped on both sides of the elevator guide rail for braking. During the braking process, the wedge blocks 800 will continue to slide upward relative to the track 700, causing the two wedge blocks 800 to respectively extrude the two side tracks 700 outward, and the elastic buffer members 600 on both sides are elastically extruded, thereby buffering the braking. At the same time, the base 100 descends together with the elevator car. The base 100 pulls the upper support plate 300 to move downward relative to the lower support plate 210 through the pull rod 110, thereby squeezing the spring damper 400. This can also buffer the braking.

[0041] By combining the two braking buffer methods, the buffer stroke of the braking is increased, and the buffering effect is better, thereby reducing the harm to the personnel in the car caused by the emergency braking of the elevator safety clamp.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; 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 embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. An elevator speed limiting safety clamp, characterized in that: It comprises a base and a safety clamp body installed on the base; The base is used to be fixed on the elevator car; The safety clamp body comprises a shell and two sets of clamp bodies symmetrically arranged in the shell; The shell is arranged on the base, lower support plates are fixed on both sides of the lower end of the shell, an upper support plate is arranged above the lower support plate, a spring shock absorber is supported between the lower support plate and the upper support plate, and the upper support plate is connected to the base through a pull rod; The clamp body includes a guide block installed in the outer shell for transverse sliding, an elastic buffer supported between the outer side of the guide block and the outer shell, a track fixed to the inner side of the guide block and with the lower end inclined outward, and a wedge block installed in a sliding manner on the inner side of the track. A channel for the guide rail of the elevator to pass through is formed between the two groups of wedge blocks of the clamp body.

2. The elevator speed limiting safety clamp according to claim 1, characterized in that: The lower end of the pull rod is fixed on the base, and the lower support plate and the upper support plate are both provided with through holes. The pull rod passes through the through holes on the lower support plate and the upper support plate in sequence, and the upper end of the pull rod is connected to a nut locked on the upper side of the upper support plate.

3. The elevator speed limiting safety clamp according to claim 2, characterized in that: The upper and lower ends of the spring shock absorber are both provided with positioning heads, the upper side of the lower support plate and the lower side of the upper support plate are both provided with positioning sleeves, and the positioning sleeves at both ends of the spring shock absorber are respectively inserted into corresponding positioning sleeves.

4. The elevator speed limiting safety clamp according to claim 2 or 3, characterized in that: The two sides of the shell are also provided with a lower support plate, an upper support plate and a protective cover outside the spring shock absorber which cover the corresponding side.

5. The elevator speed limiting safety clamp according to claim 4, characterized in that: The upper end of the protective cover is fixed to the shell by screws.

6. The elevator speed limiting safety clamp according to claim 1, characterized in that: The track is fixed to the guide block by bolts, and the oblique lower end of the track extends downward out of the bottom of the shell.

7. The elevator speed limiting safety clamp according to claim 1, characterized in that: The elastic buffer is a butterfly spring.

8. The elevator speed limiting safety clamp according to claim 1, characterized in that: It also includes a traction plate, which is arranged on the rear side of the wedge block. Two horizontal holes are symmetrically arranged on the traction plate. The two wedge blocks are connected to the corresponding horizontal holes through sliding shafts respectively. A traction rod is arranged in the middle of the traction plate and passes through the top of the shell upwards.

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