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CN-121974220-A - Progressive elevator safety tongs and elevator system

CN121974220ACN 121974220 ACN121974220 ACN 121974220ACN-121974220-A

Abstract

The invention provides progressive elevator safety tongs and an elevator system, and relates to the technical field of elevators. The progressive elevator safety tongs comprise a tongs body, a wedge block and a traction piece, wherein the wedge block is inserted into a jaw of the tongs body from bottom to top, the traction piece is connected with the wedge block and used for pulling the wedge block to move upwards relative to the tongs body, a plurality of balls which are arranged at intervals along the inclined plane of the wedge block from bottom to top are arranged on the inner side of the jaw, and the diameters of the balls are increased from bottom to top. The design decouples the strong binding relation between the ball guiding function and the wedge inclination angle, can improve the universality and economy of the safety tongs, enhance the motion stability and the stress uniformity, relieve the local stress concentration and prolong the service life of equipment.

Inventors

  • YU QINYANG

Assignees

  • 日立电梯(上海)有限公司
  • 日立电梯（中国）有限公司

Dates

Publication Date
20260505
Application Date
20260330

Claims (10)

  1. 1. The progressive elevator safety tongs are characterized by comprising a tongs body (100), a wedge block (200) and a traction piece (300); the wedge block (200) is inserted into the jaw (101) of the clamp body (100) from bottom to top; The pulling piece (300) is connected with the wedge block (200) and is used for pulling the wedge block (200) to move upwards relative to the clamp body (100); The inner side of the jaw (101) is provided with a plurality of balls (400) which are arranged at intervals along the inclined plane of the wedge block (200) from bottom to top, and the diameters of the balls (400) are increased from bottom to top.
  2. 2. The progressive elevator safety gear of claim 1, wherein a portion of the plurality of balls (400) form a first ball set (410) on one side of the wedge (200) and another portion form a second ball set (420) on the other side of the wedge (200); The first ball group (410) and the second ball group (420) are symmetrically arranged relative to the middle vertical plane, or the first ball group (410) and the second ball group (420) are arranged in a staggered manner along the vertical direction.
  3. 3. The progressive elevator safety gear of claim 2, wherein the first ball set (410) and the second ball set (420) each form a multi-segment corresponding oblique compression segment; in the first ball group (410) and the second ball group (420), the inclined pressing sections are distributed from bottom to top in sequence, and the inclination angles of the inclined pressing sections relative to the plumb line are increased in sequence.
  4. 4. The progressive elevator safety gear according to claim 2, wherein the gear body (100) comprises a gear seat (110), a first support frame (120) and a second support frame (130); the first supporting frame (120) and the second supporting frame (130) are oppositely arranged and are respectively matched with the clamp seat (110) in a sliding way; The first ball group (410) is mounted to the first support frame (120), and the second ball group (420) is mounted to the second support frame (130).
  5. 5. The progressive elevator safety gear of claim 4, further comprising a U-shaped spring (500), one movable end of the U-shaped spring (500) being compressed outside the first support frame (120) and the other movable end being compressed outside the second support frame (130).
  6. 6. The progressive elevator safety gear according to any one of claims 1 to 5, characterized in that the gear body (100) is provided with a plurality of sliding grooves (102) extending from bottom to top, the plurality of sliding grooves (102) being arranged at intervals along the oblique plane extending direction of the wedge (200); Each sliding groove (102) is slidably matched with at least one rotating shaft of the ball (400).
  7. 7. The progressive elevator safety gear of claim 1, wherein the wedge (200) includes a first chamfer block (210) and a second chamfer block (220); the first bevel block (210) and the second bevel block (220) are arranged at intervals along the horizontal direction and are jointly inserted into the jaw (101); The surfaces of the first bevel block (210) opposite to the second bevel block (220) incline from bottom to top to the inner side, and the distance between the surfaces of the first bevel block (210) opposite to the second bevel block (220) decreases from bottom to top.
  8. 8. The progressive elevator safety gear of claim 7, wherein the pulling member (300) includes a pull rod (310) and a grip (320) connected to the pull rod (310); the first bevel block (210) and the second bevel block (220) are both mounted on the carrying grip (320).
  9. 9. The progressive elevator safety gear according to claim 8, characterized in that the lifting grip (320) is provided with a sliding fit adapted to the first and second bevel blocks (210, 220).
  10. 10. Elevator system, characterized in that the elevator system is equipped with a progressive elevator safety gear according to any one of claims 1 to 9.

Description

Progressive elevator safety tongs and elevator system Technical Field The invention relates to the technical field of elevators, in particular to a progressive elevator safety gear and an elevator system. Background The elevator safety tongs are core safety components for implementing mechanical forced braking when the elevator car is in overspeed, and the working principle of the elevator safety tongs is that when the speed limiter detects that the running speed of the elevator car exceeds the upper limit of the rated speed and reaches an action threshold value, the lifting mechanism is triggered, the wedge blocks are driven to move upwards along the jaw of the tongs body by the traction piece, and normal counter force and friction resistance are generated under the action of positive pressure after the inclined surfaces of the wedge blocks are contacted with the surfaces of the guide rails, so that progressive clamping braking is realized. The prior typical safety tongs structure commonly adopts a wedge block, ball guide and U-shaped spring pre-tightening configuration. The wedge block is embedded into the jaw at a fixed inclination angle, and the ball is arranged in a groove or a guide rail groove at the inner side of the jaw along the inclined surface so as to reduce sliding friction when the wedge block ascends and guide the movement track of the wedge block. However, the structure exposes two technical bottlenecks which are mutually related and difficult to reconcile in engineering practice, namely, firstly, the wedge inclination and the ball guiding structure have strong coupling dependency relationship, so that the universality of components is poor, and the manufacturing cost is high. Because different elevator types (such as a high-speed passenger elevator, a heavy-load cargo elevator and a sightseeing elevator) have obvious differences in braking response time, braking moment and progressive requirements, wedges with different inclination angles are often required to be configured to match target braking characteristics. In the prior art, the balls need to be tightly attached to the inclined planes of the wedge blocks for rolling, and the supporting structure (such as a guide block, a guide groove or a bearing seat) of the ball needs to be designed and processed one by one according to the slope of the wedge blocks. For example, a 1:10 slope wedge block corresponds to the manufacturing guide block A, and a 1:12 slope wedge block corresponds to the manufacturing guide block B, so that the two guide blocks cannot be interchanged, the redundancy of the mold, the rapid increase of the stock type and the reduction of the single batch processing amount are caused, and the manufacturing and maintenance cost is remarkably raised. Secondly, the ball is easy to generate movement instability in the dynamic lifting process, and the risks of guiding failure and stress concentration are caused. In the stage that the traction piece drives the wedge block to quickly ascend, the ball bearing not only bears the radial supporting function, but also synchronously completes the rolling and translation compound movement along the inclined plane. The rolling delay, micro-slippage and even local clamping stagnation phenomena of the balls are often caused by the influences of assembly gaps, surface roughness and transient impact load, and particularly under the working condition of large tonnage/large stroke, the larger inertia and higher positive pressure caused by a large-size wedge block further aggravate the unbalanced load and the edge extrusion of a track, so that the balls deviate from a theoretical rolling path, the guiding precision is reduced, the local stress of the pliers body is induced to be abnormally concentrated, and the structural fatigue life and the braking reliability are reduced. The problem is essentially due to the fact that the guiding function and the inclined plane matching property are bound to a single geometric parameter (wedge inclination angle) in the prior art, and therefore the safety tongs which can customize the guiding structure independent of the wedge inclination angle and can ensure the whole-course stable rolling and accurate positioning of the balls are lacking. Disclosure of Invention The invention aims to provide progressive elevator safety tongs and an elevator system, which are used for solving the technical problems of poor manufacturing economy and poor guiding reliability in the dynamic lifting process caused by the fact that a wedge inclination angle-dependent customized guiding structure is needed in the prior art. In a first aspect, the progressive elevator safety tongs provided by the invention comprise a tongs body, a wedge block and a traction piece; The wedge blocks are inserted into the jaws of the clamp body from bottom to top; the pulling piece is connected with the wedge block and used for pulling the wedge block to move upwards relative to the clamp body; the i