Elevator counterweight safety tongs

Abstract

The elevator counter-weight safety tongs comprise a counter weight, a safety gear body and a safety gear body, the guide rails are arranged on two sides of the counterweight; the supporting cross beam is arranged at the bottom of the counterweight; the counter-weight safety tongs are arranged on the two sides of the bottom of the supporting cross beam and clamped on the guide rails, and the asynchronous braking device is connected with the counter-weight safety tongs. The counter-weight safety tongs comprise the first counter-weight safety tongs and the second counter-weight safety tongs. The asynchronous braking device comprises a crank connected with a cross beam of the counterweight safety tongs; the first driven connecting rod is connected with the first counterweight safety tongs; the second driven connecting rod is connected with the second counterweight safety tongs and is shorter than the first driven connecting rod; the driving connecting rod is connected with the tail end of the driven connecting rod; the fixed connecting rod is connected with the tail end of the driving connecting rod; by arranging the driven connecting rods with different lengths, when the driving connecting rod pulls the driven connecting rods, the first driven connecting rod and the second driven connecting rod are pulled in sequence, and the counterweight safety tongs are braked in sequence.

Description

Technical Field

[0001] The invention relates to the technical field of elevators, and in particular to an elevator counterweight safety clamp. Background Art

[0002] The elevator safety clamp device is a safety device that stops the car urgently and clamps it on the guide rail when the elevator speed exceeds the limit (or rated) speed set by the elevator speed limiter, or when the suspension rope breaks or loosens. It provides effective protection for the safe operation of the elevator.

[0003] Existing elevator safety clamps are generally arranged at the bottom of the elevator car and cooperate with the guide rails of the elevator car to prevent the elevator car from falling abnormally. However, when the elevator car rises abnormally, especially when a safety accident of the elevator car hitting the top occurs, it cannot effectively prevent the elevator car from rising abnormally.

[0004] The prior art discloses a utility model patent, the name of which is: an elevator counterweight device with a safety clamp, and the publication number is: CN221587780U. It includes a counterweight frame, a pair of safety clamp bodies are symmetrically arranged on both sides of the bottom of the counterweight frame, a safety clamp linkage mechanism is arranged between the pair of safety clamp bodies to enable the pair of safety clamp bodies to act synchronously; a safety clamp lifting mechanism for triggering the safety clamp linkage mechanism is arranged on one side of the counterweight frame.

[0005] However, the safety clamp linkage mechanism in the patent application specification will brake the safety clamps on both sides of the counterweight at the same time when braking the counterweight. Admittedly, based on comfort considerations, simultaneous braking will reduce the vibration and noise of the elevator, but it will leave hidden dangers to safety during actual application. Since simultaneous braking generates a large load on the linkage mechanism that triggers the safety clamp, and the wear and load on the wire rope connected to the safety clamp are basically the same, when one of the wire ropes breaks after being used for too long, the probability of the other wire rope breaking is also high, thereby increasing the probability of the safety clamp losing braking force at the same time, causing dangerous accidents. Summary of the invention

[0006] The purpose of the present invention is to solve the problem in the prior art that the safety clamp linkage mechanism brakes the safety clamps on both sides at the same time, causing the steel wire ropes connected to the speed limiter to bear a large load at the same time, which is easy to cause the steel wire ropes to break at the same time when used for too long.

[0007] In order to achieve the above-mentioned purpose, the present application proposes an elevator counterweight safety clamp, comprising: a counterweight; guide rails arranged on both sides of the counterweight; a supporting beam arranged at the bottom of the counterweight; a counterweight safety clamp arranged on both sides of the bottom of the supporting beam and clamped on the guide rails, and an asynchronous braking device connected to the counterweight safety clamp; wherein the counterweight safety clamp comprises: a first counterweight safety clamp and a second counterweight safety clamp; the asynchronous braking device comprises: a crank connected to the counterweight safety clamp beam; a first driven connecting rod connected to the first counterweight safety clamp; a second driven connecting rod connected to the second counterweight safety clamp and having a length less than the first driven connecting rod; an active connecting rod connected to the end of the driven connecting rod, a fixed connecting rod connected to the end of the active connecting rod, and a brake wire rope connected to the fixed connecting rod.

[0008] The asynchronous braking device of the present application, by setting follower connecting rods of different lengths, makes it possible for the active connecting rod to pull the follower connecting rod, to preferentially pull the first follower connecting rod to drive the first counterweight safety clamp to brake; when the first counterweight safety clamp fails, the active connecting rod continues to pull the second follower connecting rod to brake the second counterweight safety clamp, thereby solving the problem in the prior art that the simultaneous braking of the safety clamps on both sides by the safety clamp linkage mechanism will cause the steel wire rope connected to the speed limiter to bear a large load.

[0009] Furthermore, in order to introduce another method of asynchronous braking different from that caused by length difference, the angle formed by the first driven connecting rod and the active connecting rod is less than or equal to the angle formed by the second driven connecting rod and the active connecting rod.

[0010] Furthermore, in order to ensure the effect of asynchronous braking, the angle formed by the second driven connecting rod and the active connecting rod is less than 180 degrees.

[0011] Furthermore, in order to achieve the transmission of braking force and enable the safety clamp to work effectively, the connecting rod crank is rigidly connected to the counterweight safety clamp crossbeam, the first driven connecting rod, the second driven connecting rod and the active connecting rod are hinged, and the active connecting rod and the fixed connecting rod are hinged.

[0012] Furthermore, in order to prevent interference between the brake wire rope, the asynchronous brake device and the counterweight, the brake wire rope is arranged in a space clamped by two counterweight safety clamps.

[0013] Further, in order to fix the safety clamp, the back of the counterweight safety clamp is connected to the supporting crossbeam through a fixing angle plate.

[0014] The beneficial effects of this application are: The asynchronous braking device of the present application, by setting follower connecting rods of different lengths, makes it possible that when the active connecting rod pulls the follower connecting rod, the first follower connecting rod is preferentially pulled to drive the first counterweight safety clamp to brake; when the first counterweight safety clamp fails, the active connecting rod continues to pull the second follower connecting rod to brake the second counterweight safety clamp, thereby realizing asynchronous braking and making the loads and wear conditions of the two steel ropes different, thus solving the problem in the prior art that when the elevator is used for a long time, the simultaneous braking of the safety clamps on both sides by the safety clamp linkage mechanism will cause the steel ropes to break at the same time.

[0015] During actual use of the elevator of the present application, only the steel wire rope connected to the first counterweight safety clamp needs to be regularly inspected, while the inspection frequency of the steel wire rope connected to the second counterweight safety clamp is reduced, thereby reducing the time required for manual inspection and improving the inspection efficiency.

[0016] 3. The angle formed by the driven connecting rod and the active connecting rod of the present application is less than or equal to the angle formed by the second driven connecting rod and the active connecting rod. By changing the response speed of the angle between the active connecting rod and the first driven connecting rod and the second driven connecting rod respectively, another method different from the asynchronous braking generated by the length difference is introduced, and the effect of the asynchronous braking is enhanced.

[0017] 4. The brake wire rope of the present application is arranged in the space clamped by the two counterweight safety clamps, which can effectively avoid the interference problem between the counterweight and the asynchronous braking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of an elevator counterweight safety clamp in an embodiment of the present application; Figure 2 for Figure 1 The enlarged image at a in the middle; Figure 3 This is a schematic diagram of the installation of the fixed angle plate in the embodiment of the present application; Description of reference numerals: 1. Counterweight; 2. Guide rails; 3. Support beams; 4. Counterweight safety clamp; 41. First counterweight safety clamp; 42. Second counterweight safety clamp; 5. Asynchronous brake device; 51. Crank; 52. First driven connecting rod; 53. Second driven connecting rod; 54. Active connecting rod; 55. Fixed connecting rod; 56. Braking wire rope; 6. Fix the angle plate. DETAILED DESCRIPTION

[0020] The following will be combined with the attached Figures 1 to 3 The embodiments of the technical solution of the present application are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0021] like Figure 1~2 An elevator counterweight safety clamp of the present application is illustrated. In this embodiment, the elevator counterweight safety clamp device includes a counterweight 1, and guide rails 2 are respectively arranged on both sides of the counterweight 1 to guide the counterweight 1 to move up and down in the elevator shaft. At the bottom of the counterweight 1, a supporting beam 3 is provided to support the weight of the entire counterweight 1. Two counterweight safety clamps 4 arranged on both sides of the bottom of the supporting beam 3 are respectively clamped on the guide rails 2 on both sides.

[0022] For further information, please refer to Figure 2 The counterweight safety clamp 4 includes a first counterweight safety clamp 41 and a second counterweight safety clamp 42. When the elevator encounters abnormal situations such as overspeed or loss of control, it can clamp the guide rail 2 in time to stop the movement of the counterweight 1, thereby ensuring the safety of the elevator.

[0023] Please continue to refer to Figure 2 In order to achieve the effect of asynchronous braking, the asynchronous braking device 5 of the present application includes a crank 51 connected to the crossbeam of the counterweight safety clamp 4, and the crank 51 is rigidly connected to the crossbeam of the counterweight safety clamp 4 to ensure the movement synchronization between the two. It also includes a first driven connecting rod 52 connected to the first counterweight safety clamp 41, and a second driven connecting rod 53 connected to the second counterweight safety clamp 42 and having a length less than the first driven connecting rod 52. The two driven connecting rods 52 and 53 are hinged with the active connecting rod 54, so that they can rotate relative to each other within a certain range.

[0024] For further information, please refer to Figure 2The first driven link 52 and the second driven link 53 of unequal lengths can brake the first counterweight safety clamp 41 and the second counterweight safety clamp 42 in sequence. When the active link 54 is pulled by the fixed link 55, the first driven link 52 with a shorter length will be pulled by the active link 54 first, so that it drives the first counterweight safety clamp 41 to brake. When the first counterweight safety clamp 41 fails, the fixed link 55 continues to pull the active link 54, so that the inclination angle between the second driven link 53 and the active link 54 becomes smaller, so that the second counterweight safety clamp 42 continues to brake, achieving the effect of step-by-step braking and avoiding the simultaneous braking from generating a large load on the brake wire rope.

[0025] For further information, please refer to Figure 2 The end of the active link 54 is connected to a fixed link 55, and the fixed link 55 is also hinged to the active link 54. A brake wire rope 56 is connected to the end of the fixed link 55. When an abnormal situation occurs in the elevator, the asynchronous brake device 5 will be triggered, and the brake wire rope 56 will be tightened through the linkage of the crank 51, the driven links 52, 53, the active link 54 and the fixed link 55, thereby realizing asynchronous braking of the counterweight safety clamp 4.

[0026] Furthermore, during long-term use, the asynchronous braking method causes different wear on the brake wire rope 56 separated from the first counterweight safety clamp 41 and the second counterweight safety clamp 42. When the elevator is braked, since the first counterweight safety clamp 41 clamps the brake wire rope 56 first, the wedge of the first counterweight safety clamp 41 first contacts and rubs against the surface of the brake wire rope 56. Thereafter, when the first counterweight safety clamp 41 fails, the second counterweight safety clamp 42 clamps the brake wire rope 56. Therefore, the wear on the second counterweight safety clamp 42 and the brake wire rope 56 lags behind the wear on the first counterweight safety clamp 41 and the brake wire rope 56.

[0027] For further information, please refer to Figure 2 , the angle formed by the driven link 52 and the active link 54 is less than or equal to the angle formed by the second driven link 53 and the active link 54. On the one hand, the active link 54 is used to change the response speed of the angle with the first driven link 52 and the second driven link 53 respectively, introducing another method different from asynchronous braking caused by length difference. On the other hand, it ensures that during the braking process, the two counterweight safety clamps 4 can clamp the guide rail 2 simultaneously and evenly to avoid damage or poor braking effect caused by uneven force. At the same time, the angle formed by the second driven link 53 and the active link 54 is less than 180 degrees, which is also to ensure that the connecting rod mechanism can work normally and transmit braking force.

[0028] For further information, please refer to Figure 1The brake wire rope 56 is cleverly arranged in the space clamped by the two counterweight safety clamps 4, which not only saves space but also prevents the brake wire rope 56 from interfering with or rubbing against the counterweight safety clamp 4 during the braking process.

[0029] For further information, please refer to Figure 3 The back of the counterweight safety clamp 4 is connected to the supporting crossbeam 3 through a fixed angle plate 6. The design of the fixed angle plate 6 enables the counterweight safety clamp 4 to be more firmly installed on the supporting crossbeam 3 to ensure that it will not loosen or fall off during braking.

[0030] In summary, the elevator counterweight safety clamp of the present invention realizes asynchronous braking of the counterweight 1 under abnormal elevator conditions through the cleverly designed asynchronous braking device 5, thereby greatly improving the safety and reliability of the elevator.

[0031] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "upper", "lower", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description. They do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0032] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "set", "provided with", "connected", "installed" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated; they can be directly connected, or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0033] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, 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.

Claims

1. An elevator counterweight safety clamp, comprising: A counterweight (1); guide rails (2) arranged on both sides of the counterweight (1); a supporting crossbeam (3) arranged at the bottom of the counterweight (1); characterized in that a counterweight safety clamp (4) is arranged on both sides of the bottom of the supporting crossbeam (3) and clamped on the guide rails (2); and an asynchronous braking device (5) connected to the counterweight safety clamp (4); wherein the counterweight safety clamp (4) comprises: a first counterweight safety clamp (41) and a second counterweight safety clamp (42); the asynchronous braking device (5) comprises: a crank (51) connected to the crossbeam of the counterweight safety clamp (4); a first driven connecting rod (52) connected to the first counterweight safety clamp (41); a second driven connecting rod (53) connected to the second counterweight safety clamp (42) and having a shorter length than the first driven connecting rod (52); an active connecting rod (54) connected to the end of the driven connecting rod, a fixed connecting rod (55) connected to the end of the active connecting rod (54), and a brake wire rope (56) connected to the fixed connecting rod (55).

2. The elevator counterweight safety clamp according to claim 1, characterized in that: The angle formed by the first driven connecting rod (52) and the driving connecting rod (54) is smaller than or equal to the angle formed by the second driven connecting rod (53) and the driving connecting rod (54).

3. The elevator counterweight safety clamp according to claim 1, characterized in that: The included angle formed by the second driven connecting rod (53) and the active connecting rod (54) is less than 180 degrees.

4. The elevator counterweight safety clamp according to claim 1, characterized in that: The crank (51) is rigidly connected to the crossbeam of the counterweight safety clamp (4); the first driven connecting rod (52), the second driven connecting rod (53) and the active connecting rod (54) are hinged; and the active connecting rod (54) and the fixed connecting rod (55) are hinged.

5. The elevator counterweight safety clamp according to claim 1, characterized in that: The brake wire rope (56) is arranged in a space clamped by two counterweight safety clamps (4).

6. The elevator counterweight safety clamp according to claim 1, characterized in that: The back of the counterweight safety clamp (4) is connected to the supporting crossbeam (3) via a fixed angle plate (6).

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