A wedge brake type elevator safety gear and overspeed self-locking brake method

Abstract

The application relates to the vertical lift manufacturing technical field, in particular to a wedge block brake type elevator safety clamp and an overspeed self-locking braking method. In terms of the safety clamp, a safety clamp bushing is fixedly arranged in a safety clamp shell; two groups of wedge block braking assemblies are arranged in the left and right inner side areas of the safety clamp bushing and each group of the wedge block braking assemblies comprises a guide seat and a braking wedge block; the side of the guide seat facing the center of the safety clamp bushing is provided with a guide inclined surface; the guide inclined surface is in sliding fit with the side surface of the corresponding braking wedge block; a lifting mechanism is in transmission connection with the braking wedge blocks on the two sides. A left adjusting bolt assembly is transversely arranged in the left side wall of the safety clamp shell, and a right adjusting bolt assembly is transversely arranged in the right side wall; the inner ends of the left and right adjusting bolt assemblies are respectively in abutment with the left and right guide seats. The independent adjustment of the left and right adjusting bolt assemblies can calibrate the braking initial clearances on the two sides respectively, ensures the consistency of the left and right clearances, shortens the braking stroke, and stably maintains the self-locking braking effect of the inclined surface.

Description

Technical Field

[0001] This invention relates to the field of vertical elevator manufacturing technology, and in particular to a wedge-type elevator safety clamp and an overspeed self-locking braking method. Background Technology

[0002] The elevator safety clamp is the core braking actuator of the elevator overspeed protection system. It works in conjunction with the speed limiter to achieve emergency braking by clamping the elevator guide rails in dangerous situations such as elevator car overspeeding or traction system failure. It is a core protective component for elevator operation safety.

[0003] Wedge-type safety gears, relying on the force-amplifying and self-locking characteristics of inclined surfaces, offer stable braking force and high reliability, making them the most widely used safety gear structure in the current elevator industry. A typical wedge-type elevator safety gear includes an outer shell, internal load-bearing components, a guide seat, brake wedges, and a lifting mechanism. The guide seat is fixedly mounted on the inner side of the internal load-bearing components. The brake wedges slide against the inclined guide surface of the guide seat. During braking, the lifting mechanism drives the brake wedges upward along the inclined guide surface, causing the two brake wedges to converge and clamp the elevator guide rails, creating a self-locking braking force based on the downward trend of the car.

[0004] The initial braking clearance between the brake wedge and the elevator guide rail directly determines the braking response speed and braking force consistency of the safety gear. In existing wedge-type elevator safety gears, the guide seat and internal load-bearing components are fixedly connected, and the braking clearance is entirely determined by the machining and assembly precision of the parts. After assembly, it is impossible to fine-tune the braking clearance on-site. When there are installation position deviations in the elevator guide rail or wear on the friction surface of the brake wedge, the braking clearance will deviate from the design range, causing braking response lag and asynchronous braking forces on both sides. This directly affects braking reliability and increases the difficulty and cost of equipment maintenance.

[0005] Therefore, it is imperative for those skilled in the art to solve the aforementioned problems. Summary of the Invention

[0006] The purpose of this invention is to provide a wedge-type elevator safety clamp, which aims to solve the problem that the braking clearance of existing wedge-type elevator safety clamps cannot be easily adjusted on-site and is easily affected by guide rail installation deviations and friction surface wear, resulting in clearance deviations.

[0007] This invention relates to a wedge-brake type elevator safety gear, including a safety gear housing, a safety gear bushing, a left wedge brake assembly, a right wedge brake assembly, a lifting mechanism, a left adjusting bolt assembly, and a right adjusting bolt assembly; The safety gear bushing is fixedly installed in the internal cavity of the safety gear housing; The left wedge brake assembly is located on the inner left side of the safety caliper bushing and includes a left guide seat and a left brake wedge. The left guide seat has a left guide ramp that slopes from bottom to top toward the center of the safety caliper bushing on the right side for sliding engagement with the left brake wedge. The right wedge brake assembly is located on the inner right side of the safety caliper bushing and includes a right guide seat and a right brake wedge. The right guide seat has a right guide ramp that slopes from bottom to top toward the center of the safety caliper bushing on the side facing the left, which is used to slide and engage the right brake wedge. The side of the left brake wedge facing the right brake wedge is the left brake friction working surface, and the side of the right brake wedge facing the left brake wedge is the right brake friction working surface. A guide rail channel is formed between the left brake friction working surface and the right brake friction working surface. The lifting mechanism is simultaneously connected to the left brake wedge and the right brake wedge, and is used to synchronously drive the left brake wedge to slide vertically along the left guide slope and the right brake wedge along the right guide slope. The left-side adjusting bolt assembly traverses the left side wall of the safety clamp housing laterally, with its inner end abutting against the left guide seat to drive the left guide seat to move laterally. The right-side adjusting bolt assembly traverses the right side wall of the safety clamp housing laterally, with its inner end abutting against the right guide seat to drive the right guide seat to move laterally.

[0008] As a further improvement to the technical solution disclosed in this invention, the left guide seat can be slidably installed on the inner left side of the safety gear bushing, and the right guide seat can be slidably installed on the inner right side of the safety gear bushing; the sliding direction of the left guide seat and the sliding direction of the right guide seat are both perpendicular to the central axis of the guide rail channel.

[0009] As a further improvement to the technical solution disclosed in this invention, the safety gear bushing is integrally formed from a left side wall, a right side wall, and a back connecting wall. The front of the safety gear bushing is provided with an opening for the elevator guide rail to be inserted. The left side wall of the safety gear bushing is arranged at a distance from the left side wall of the safety gear housing, and the right side wall of the safety gear bushing is arranged at a distance from the right side wall of the safety gear housing.

[0010] As a further improvement to the technical solution disclosed in this invention, the lifting mechanism includes a lifting rod and a lifting plate; the lifting rod is arranged vertically, and the lower end of the lifting rod is fixedly connected to the middle part of the lifting plate; the left end of the lifting plate is hinged to the left brake wedge, and the right end of the lifting plate is hinged to the right brake wedge.

[0011] As a further improvement to the technical solution disclosed in this invention, the lifting plate is provided with a left-side waist-shaped adjustment hole and a right-side waist-shaped adjustment hole; both the left-side waist-shaped adjustment hole and the right-side waist-shaped adjustment hole are arranged to extend laterally; the left brake wedge is hinged to the lifting plate through a left-side connecting screw passing through the left-side waist-shaped adjustment hole; the right brake wedge is hinged to the lifting plate through a right-side connecting screw passing through the right-side waist-shaped adjustment hole.

[0012] As a further improvement to the technical solution disclosed in this invention, the left adjusting bolt assembly includes a left adjusting bolt and a left locking nut; the left adjusting bolt is threaded into the left side wall of the safety gear housing, and its inner end abuts against the left side of the left guide seat; the left locking nut is sleeved on the left adjusting bolt and is used to lock the position of the left adjusting bolt after adjustment. The right-side adjusting bolt assembly includes a right adjusting bolt and a right locking nut; the right adjusting bolt is threaded into the right side wall of the safety gear housing, and its inner end abuts against the right side face of the right guide seat; the right locking nut is sleeved on the right adjusting bolt and is used to lock the position of the right adjusting bolt after adjustment.

[0013] As a further improvement to the technical solution disclosed in this invention, a left guide sliding pair is provided between the left guide inclined surface and the left side surface of the left brake wedge, and a right guide sliding pair is provided between the right guide inclined surface and the right side surface of the right brake wedge; the left guide sliding pair and the right guide sliding pair are dovetail groove sliding fit structures or roller guide fit structures.

[0014] As a further improvement to the technical solution disclosed in this invention, both the left and right brake friction working surfaces are provided with an anti-slip friction layer, which is a ceramic friction layer or an alloy wear-resistant friction layer.

[0015] Furthermore, this invention also discloses an overspeed self-locking braking method, implemented using the aforementioned wedge-type elevator safety gear, comprising the following steps: S1. Trigger Braking: When the elevator's running speed exceeds the preset safety threshold, the external speed limiting device drives the lifting mechanism to move vertically upward. Simultaneously, the lifting mechanism drives the left brake wedge to slide upward along the left guide slope and the right brake wedge to slide upward along the right guide slope. S2. Gap closing: During the upward movement of the left and right brake wedges, they generate lateral displacements in opposite directions under the inclined guiding constraints of the left and right guide ramps, respectively, gradually reducing the gap between the guide rail channels until the left and right brake friction surfaces jointly clamp the elevator guide rails. S3. Self-locking Braking: The downward movement of the elevator car causes the safety clamp housing and safety clamp bushing to move downward relative to the elevator guide rail, which in turn causes the left guide seat to move downward relative to the left brake wedge and the right guide seat to move downward relative to the right brake wedge. This causes the left and right brake wedges to further wedge into the gap between the corresponding guide seats and the elevator guide rail. The positive pressure between the left and right brake friction surfaces and the elevator guide rail continues to increase with the downward movement, forming a self-locking braking force that decelerates the elevator car until it stops.

[0016] As a further improvement to the technical solution disclosed in this invention, a braking release step is also included: When the elevator is released from braking, the external speed limiting device drives the lifting mechanism to move vertically downward, causing the left brake wedge to slide down along the left guide slope and the right brake wedge to slide down along the right guide slope to reset; the left and right brake wedges synchronously generate opposite lateral displacements, releasing the elevator guide rail and restoring the normal operating clearance of the guide rail channel.

[0017] In practical applications, the wedge-type elevator safety clamp disclosed in this invention can achieve at least the following beneficial technical effects, specifically: 1) The left brake clearance is calibrated by the lateral displacement of the left guide seat, and the right brake clearance is calibrated by the lateral displacement of the right guide seat, so that the initial clearances between the left brake wedge and the elevator guide rail, and the initial clearances between the right brake wedge and the elevator guide rail are consistent. When the brake is triggered, the left brake wedge retracts along the left guide ramp, and the right brake wedge retracts along the right guide ramp. The left and right brake wedges simultaneously contact and clamp the elevator guide rail; the controllable initial clearance can limit the brake trigger stroke, maintain a stable ramp self-locking braking effect, and ensure the consistency of braking force output. 2) Rotating the left-side adjusting bolt assembly pushes the left guide seat to move laterally, and rotating the right-side adjusting bolt assembly pushes the right guide seat to move laterally, thereby adjusting the brake clearance. Furthermore, the adjustment operation can be performed directly from the outside of the safety gear housing without disassembling the internal assembly structure, making it suitable for assembly, debugging, and subsequent maintenance scenarios. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional schematic diagram of the wedge-type elevator safety clamp disclosed in this invention from one perspective.

[0020] Figure 2 This is a three-dimensional schematic diagram of the wedge-type elevator safety clamp disclosed in this invention from another perspective.

[0021] Figure 3 yes Figure 1 Top view (with hidden lines visible).

[0022] Figure 4 yes Figure 3 AA sectional view.

[0023] Figure 5 This is also a three-dimensional schematic diagram of the wedge-type elevator safety clamp disclosed in this invention (with the safety clamp housing hidden).

[0024] Figure 6 This is also a three-dimensional schematic diagram of the wedge-type elevator safety gear disclosed in this invention (with the safety gear housing and safety gear bushing both hidden).

[0025] Figure 7 This is also a three-dimensional schematic diagram of the wedge-type elevator safety gear disclosed in this invention from another perspective (with the safety gear housing and safety gear bushing both hidden).

[0026] 1-Safety clamp housing; 2-Safety clamp bushing; 21-Left side wall; 22-Right side wall; 23-Back connecting wall; 3-Left side wedge brake assembly; 31-Left guide seat; 32-Left brake wedge; 4-Right side wedge brake assembly; 41-Right guide seat; 42-Right brake wedge; 5-Lifting mechanism; 51-Lifting rod; 52-Lifting lever; 53-Left connecting screw; 54-Right connecting screw; 6-Left adjusting bolt assembly; 61-Left adjusting bolt; 62-Left locking nut; 7-Right adjusting bolt assembly; 71-Right adjusting bolt; 72-Right locking nut. Detailed Implementation

[0027] The wedge-type elevator safety clamp is matched with the elevator guide rail and is mainly used in the overspeed protection system of vertical elevators to realize emergency self-locking braking under overspeed descent conditions, and optimize the adjustability of the braking gap and the convenience of equipment operation and maintenance.

[0028] The present invention will be further described in detail below with reference to specific embodiments. Figures 1-3The two images together show two different perspective views of the wedge brake elevator safety clamp disclosed in this invention. It can be seen that it is mainly composed of several parts, including the safety clamp housing 1, the safety clamp bushing 2, the left wedge brake assembly 3, the right wedge brake assembly 4, the lifting mechanism 5, the left adjusting bolt assembly 6, and the right adjusting bolt assembly 7. The safety clamp bushing 2 is fixedly installed in the internal cavity of the safety clamp housing 1, serving as the mounting base for the internal braking components. The left wedge brake assembly 3 and the right wedge brake assembly 4 are respectively installed in the inner left and right sides of the safety clamp bushing 2, forming a clamping brake pair. The lifting mechanism 5 is simultaneously connected to the left wedge brake assembly 3 and the right wedge brake assembly 4, and is used to synchronously drive the left brake wedge 32 to slide vertically along the left guide slope and the right brake wedge 42 to slide vertically along the right guide slope. The left adjusting bolt assembly 6 and the right adjusting bolt assembly 7 are respectively installed transversely through the left and right sides of the safety clamp housing 1. The inner end of the left adjusting bolt assembly 6 abuts against the left guide seat 31, and the inner end of the right adjusting bolt assembly 7 abuts against the right guide seat 41, so as to drive the left guide seat 31 and the right guide seat 41 to move laterally and calibrate the initial braking clearance.

[0029] Under normal operating conditions, a guide rail channel is formed between the left brake wedge 32 and the right brake wedge 42 for the elevator guide rail to pass through. The left and right brake friction surfaces maintain a preset initial braking gap with the side wall of the elevator guide rail, and the safety clamp moves up and down normally along the guide rail synchronously with the car. When the elevator descends at excessive speed and reaches the safety threshold, the external speed limiting device triggers the lifting mechanism 5 to move vertically upward, simultaneously driving the left brake wedge 32 to move up along the left guide slope and the right brake wedge 42 to move up along the right guide slope. The left brake wedge 32 and the right brake wedge 42 close together to clamp the elevator guide rail, and rely on the downward trend of the car to form a slope self-locking force-increasing effect, ultimately achieving emergency braking.

[0030] like Figure 5 As shown, the safety gear bushing 2 is integrally formed from a left side wall 21, a right side wall 22, and a back connecting wall 23. The front of the safety gear bushing 2 has an opening for inserting the elevator guide rail. The left side wall 21 of the safety gear bushing 2 is spaced apart from the left side wall of the safety gear housing 1, and the right side wall 22 of the safety gear bushing 2 is spaced apart from the right side wall of the safety gear housing 1, providing space for lateral adjustment of the left guide seat 31 and the right guide seat 41. The left guide seat 31 can be slidably installed on the inner left side of the safety gear bushing 2, and the right guide seat 41 can be slidably installed on the inner right side of the safety gear bushing 2. The sliding direction of the left guide seat 31 and the right guide seat 41 are both perpendicular to the central axis of the guide rail channel, ensuring that the clearance adjustment direction matches the braking working surface.

[0031] As Figure 4As shown, the left wedge brake assembly 3 includes a left guide seat 31 and a left brake wedge 32; the left guide seat 31 has a left guide ramp that slopes upwards towards the center of the safety caliper bushing 2 on its right-facing side, for sliding engagement with the left brake wedge 32. The right wedge brake assembly 4 includes a right guide seat 41 and a right brake wedge 42; the right guide seat 41 has a right guide ramp that slopes upwards towards the center of the safety caliper bushing 2 on its left-facing side, for sliding engagement with the right brake wedge 42. The side of the left brake wedge 32 facing the right brake wedge 42 is the left brake friction working surface, and the side of the right brake wedge 42 facing the left brake wedge 32 is the right brake friction working surface, forming a guide rail channel between the left and right brake friction working surfaces.

[0032] To achieve synchronous vertical drive of the left brake wedge 32 and the right brake wedge 42, the safety gear is equipped with a lifting mechanism 5. For example... Figure 6 , Figure 7 As shown, the lifting mechanism 5 includes a lifting rod 51 and a lifting plate 52; the lifting rod 51 is arranged vertically, and the lower end of the lifting rod 51 is fixedly connected to the middle part of the lifting plate 52; the left end of the lifting plate 52 is hinged to the left brake wedge 32, and the right end of the lifting plate 52 is hinged to the right brake wedge 42.

[0033] Furthermore, such as Figure 7 As shown, the lifting plate 52 is provided with a left-side waist-shaped adjustment hole and a right-side waist-shaped adjustment hole; both the left-side and right-side waist-shaped adjustment holes are arranged laterally; the left brake wedge 32 is hinged to the lifting plate 52 via a left-side connecting screw 53 passing through the left-side waist-shaped adjustment hole; the right brake wedge 42 is hinged to the lifting plate 52 via a right-side connecting screw 54 passing through the right-side waist-shaped adjustment hole. The waist-shaped hole structure can accommodate the lateral displacement of the left brake wedge 32 and the right brake wedge 42 during the lifting process, while also accommodating the initial position change of the wedges caused by the lateral adjustment of the left guide seat 31 and the right guide seat 41, thus avoiding motion interference.

[0034] To facilitate convenient adjustment of the outer side of the brake clearance, the safety gear is equipped with a left-side adjusting bolt assembly 6 and a right-side adjusting bolt assembly 7. Combined with... Figure 4It is known that the left adjusting bolt assembly 6 includes a left adjusting bolt 61 and a left locking nut 62; the left adjusting bolt 61 is threaded into the left side wall of the safety gear housing 1, and the inner end of the left adjusting bolt 61 abuts against the left side of the left guide seat 31; the left locking nut 62 is sleeved on the left adjusting bolt 61 and is used to lock the position of the left adjusting bolt 61 after adjustment. The right adjusting bolt assembly 7 includes a right adjusting bolt 71 and a right locking nut 72; the right adjusting bolt 71 is threaded into the right side wall of the safety gear housing 1, and the inner end of the right adjusting bolt 71 abuts against the right side of the right guide seat 41; the right locking nut 72 is sleeved on the right adjusting bolt 71 and is used to lock the position of the right adjusting bolt 71 after adjustment. Rotating the left adjusting bolt 61 and the right adjusting bolt 71 will push the left guide seat 31 and the right guide seat 41 to move back to their original positions laterally, thus precisely adjusting the initial gap between the left and right braking friction surfaces and the elevator guide rail. The adjustment operation can be performed directly from the outside of the safety clamp housing 1 without disassembling the internal assembly structure.

[0035] Based on this, a left guide sliding pair is provided between the left guide ramp and the left side of the left brake wedge 32, and a right guide sliding pair is provided between the right guide ramp and the right side of the right brake wedge 42; the left guide sliding pair and the right guide sliding pair are dovetail groove sliding fit structures or roller guide fit structures, which improve the accuracy and smoothness of the sliding trajectory of the left brake wedge 32 and the right brake wedge 42.

[0036] Furthermore, both the left and right brake friction surfaces are equipped with anti-slip friction layers, which are either ceramic friction layers or alloy wear-resistant friction layers, thereby improving the braking friction coefficient and the service life of the working surfaces.

[0037] Furthermore, this invention also discloses an overspeed self-locking braking method, implemented using the aforementioned wedge-type elevator safety gear, comprising the following steps: S1. Trigger Braking: When the elevator's running speed exceeds the preset safety threshold, the external speed limiting device drives the lifting mechanism 5 to move vertically upward. Simultaneously, the lifting mechanism 5 drives the left brake wedge 32 to slide upward along the left guide slope and the right brake wedge 42 to slide upward along the right guide slope. S2. Gap closing: During the upward movement of the left brake wedge 32 and the right brake wedge 42, they generate lateral displacements in opposite directions under the inclined guiding constraints of the left guide slope and the right guide slope, respectively, gradually reducing the gap between the guide rail channels until the left brake friction working surface and the right brake friction working surface jointly clamp the elevator guide rail. S3. Self-locking Braking: The downward movement of the elevator car causes the safety clamp housing 1 and safety clamp bushing 2 to move downward relative to the elevator guide rail, which drives the left guide seat 31 to move downward relative to the left brake wedge 32 and the right guide seat 41 to move downward relative to the right brake wedge 42. This causes the left brake wedge 32 and the right brake wedge 42 to further wedge into the gap between the corresponding guide seat and the elevator guide rail. The positive pressure between the left brake friction working surface, the right brake friction working surface and the elevator guide rail continues to increase with the downward movement, forming a self-locking braking force, which decelerates the elevator car until it stops.

[0038] When the elevator is released from braking, the external speed limiting device drives the lifting mechanism 5 to move vertically downward, causing the left brake wedge 32 to slide down along the left guide slope and the right brake wedge 42 to slide down along the right guide slope to reset; the left brake wedge 32 and the right brake wedge 42 synchronously generate opposite lateral displacements, releasing the elevator guide rail and restoring the normal operating clearance of the guide rail channel.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wedge-type elevator safety gear, comprising a safety gear housing, a safety gear bushing, a left wedge-type braking assembly, a right wedge-type braking assembly, a lifting mechanism, a left-positioned adjusting bolt assembly, and a right-positioned adjusting bolt assembly, characterized in that: The safety clamp bushing is fixedly disposed in the internal cavity of the safety clamp housing; The left wedge brake assembly is located on the left inner side of the safety clamp bushing and includes a left guide seat and a left brake wedge. The left guide seat has a left guide slope that slopes from bottom to top toward the center of the safety clamp bushing on the right side for slidingly engaging the left brake wedge. The right wedge brake assembly is located on the inner right side of the safety clamp bushing and includes a right guide seat and a right brake wedge. The right guide seat has a right guide slope that slopes from bottom to top toward the center of the safety clamp bushing on the side facing the left, for sliding engagement with the right brake wedge. The side of the left brake wedge facing the right brake wedge is the left brake friction working surface, and the side of the right brake wedge facing the left brake wedge is the right brake friction working surface. A guide rail channel is formed between the left brake friction working surface and the right brake friction working surface. The lifting mechanism is simultaneously connected to the left brake wedge and the right brake wedge, and is used to synchronously drive the left brake wedge to slide vertically along the left guide slope and the right brake wedge along the right guide slope. The left-side adjusting bolt assembly extends laterally through the left side wall of the safety clamp housing, with its inner end abutting against the left guide seat to drive the left guide seat to move laterally. The right-side adjusting bolt assembly extends laterally through the right side wall of the safety clamp housing, with its inner end abutting against the right guide seat to drive the right guide seat to move laterally.

2. The wedge-type elevator safety clamp according to claim 1, characterized in that, The left guide seat can be slidably mounted on the inner left side of the safety clamp bushing, and the right guide seat can be slidably mounted on the inner right side of the safety clamp bushing; the sliding direction of the left guide seat and the sliding direction of the right guide seat are both perpendicular to the central axis of the guide rail channel.

3. The wedge-type elevator safety clamp according to claim 1, characterized in that, The safety clamp bushing is integrally formed from a left side wall, a right side wall, and a back connecting wall. The front of the safety clamp bushing has an opening for inserting the elevator guide rail. The left side wall of the safety clamp bushing is arranged at a distance from the left side wall of the safety clamp housing, and the right side wall of the safety clamp bushing is arranged at a distance from the right side wall of the safety clamp housing.

4. The wedge-type elevator safety clamp according to claim 1, characterized in that, The lifting mechanism includes a lifting rod and a lifting plate; the lifting rod is arranged vertically, and the lower end of the lifting rod is fixedly connected to the middle part of the lifting plate; the left end of the lifting plate is hinged to the left brake wedge, and the right end of the lifting plate is hinged to the right brake wedge.

5. The wedge-type elevator safety clamp according to claim 4, characterized in that, The lifting plate is provided with a left-side waist-shaped adjustment hole and a right-side waist-shaped adjustment hole; both the left-side waist-shaped adjustment hole and the right-side waist-shaped adjustment hole are arranged to extend laterally; the left brake wedge is hinged to the lifting plate by a left-side connecting screw passing through the left-side waist-shaped adjustment hole; the right brake wedge is hinged to the lifting plate by a right-side connecting screw passing through the right-side waist-shaped adjustment hole.

6. The wedge-type elevator safety clamp according to claim 1, characterized in that, The left adjusting bolt assembly includes a left adjusting bolt and a left locking nut; the left adjusting bolt is threaded into the left side wall of the safety clamp housing, and its inner end abuts against the left side of the left guide seat; the left locking nut is sleeved on the left adjusting bolt and is used to lock the position of the left adjusting bolt after adjustment. The right-side adjusting bolt assembly includes a right adjusting bolt and a right locking nut; the right adjusting bolt is threaded into the right side wall of the safety clamp housing, and its inner end abuts against the right side face of the right guide seat; the right locking nut is sleeved on the right adjusting bolt and is used to lock the position of the right adjusting bolt after adjustment.

7. The wedge-type elevator safety clamp according to claim 1, characterized in that, A left guide sliding pair is provided between the left guide inclined surface and the left side surface of the left brake wedge, and a right guide sliding pair is provided between the right guide inclined surface and the right side surface of the right brake wedge; the left guide sliding pair and the right guide sliding pair are dovetail groove sliding fit structures or roller guide fit structures.

8. The wedge-type elevator safety clamp according to claim 1, characterized in that, Both the left and right brake friction surfaces are provided with anti-slip friction layers, which are ceramic friction layers or alloy wear-resistant friction layers.

9. An overspeed self-locking braking method, characterized in that, The elevator safety gear, implemented using any one of claims 1-8, includes the following steps: S1. Trigger Braking: When the elevator's running speed exceeds the preset safety threshold, the external speed limiting device drives the lifting mechanism to move vertically upward. The lifting mechanism simultaneously drives the left brake wedge to slide upward along the left guide slope and the right brake wedge to slide upward along the right guide slope. S2, Gap narrowing: During the upward movement of the left brake wedge and the right brake wedge, they generate lateral displacements in opposite directions under the inclined guiding constraints of the left guide slope and the right guide slope, respectively, gradually reducing the gap between the guide rail channels until the left brake friction working surface and the right brake friction working surface jointly clamp the elevator guide rail; S3. Self-locking Braking: The downward movement of the elevator car causes the safety clamp housing and the safety clamp bushing to move downward relative to the elevator guide rail, driving the left guide seat to move downward relative to the left brake wedge and the right guide seat to move downward relative to the right brake wedge. This causes the left and right brake wedges to further wedge into the gap between the corresponding guide seats and the elevator guide rail. The positive pressure between the left and right brake friction surfaces and the elevator guide rail continues to increase with the downward movement, forming a self-locking braking force to decelerate the elevator car until it stops.

10. The overspeed self-locking braking method according to claim 9, characterized in that, It also includes the brake release step: When the elevator is released from braking, the external speed limiting device drives the lifting mechanism to move vertically downward, causing the left brake wedge to slide down the left guide slope and the right brake wedge to slide down the right guide slope to reset; the left brake wedge and the right brake wedge synchronously generate opposite lateral displacements, releasing the elevator guide rail and restoring the normal operating clearance of the guide rail channel.

Images