An elevator load test safety protection device and method

Abstract

The present invention discloses an elevator load test safety protection device and method. Two sliders are located between two clamping blocks. One slider corresponds to one clamping block and one self-locking mechanism. Among them, the slider and the clamping block are slidably connected through a dovetail groove mechanism. A chute is provided on the base, and the bottom of the clamping block is inserted into the chute. The outer shell is fixed on the base, and the side surface of the clamping block is connected to the outer shell through a braking spring. The top of the slider is connected to the outer shell through a return spring; the governor wire rope passes through the base and the outer shell, and the governor wire rope is located between the two sliders. The two clamping blocks are connected through an electric push rod; the controller is connected to the electric push rod and the self-locking mechanism. This device can effectively solve the problem of unreliable low-speed sliding and stopping during the 1.25-fold rated load test of the elevator.

Description

Technical Field

[0001] The present invention belongs to the technical field of elevator safety protection, and particularly relates to an elevator unexpected movement safety protection device and method. Background Art

[0002] Elevators, as a symbol of human material civilization, have become increasingly mature in various technical indicators after more than 150 years of development. However, with the increase in the service life and usage frequency of in-use elevators, the elevator safety protection components are inevitably worn and aged, becoming potential hidden dangers for the safe operation of elevators. Among them, the brake is the primary safety protection component for the safe operation of elevators, and its operating performance directly affects whether the elevator can operate safely. Therefore, during the daily maintenance of elevators, it is necessary to focus on checking whether the components of the brake are in good condition. However, the components of the elevator brake are often encapsulated, and it is difficult to judge whether its performance meets the standard by visual inspection and no-load test. Therefore, since October 2017, the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China has promulgated the "Notice on Several Issues Concerning the Implementation of the 2nd Amendment to the Rules for Elevator Supervision and Regular Inspection", requiring in-use passenger elevators to conduct a braking test with a rated load of 1.25 times every 5 years. Since the 1.25-fold rated load test of the elevator is an operation test with certain destructive power, the traction condition of the elevator will be damaged instantaneously during the emergency braking of the elevator, resulting in the out-of-control sliding of the car.

[0003] Although the elevator is currently equipped with a speed limiter to monitor the overspeed operation of the car, the car usually slips slowly after the elevator brakes. At this time, it is difficult for the speed limiter to monitor the overspeed downward movement of the elevator, resulting in car squatting and counterweight overshoot accidents, which may seriously damage the elevator traction system or even cause personal injuries in severe cases.

[0004] In addition, during the downward braking test of the elevator, a load of 1.25 times the rated load needs to be placed in the car. During the loading and unloading process of the load, if the braking force of the brake is insufficient, the elevator will slide when the door is opened, posing a major safety risk of personnel shearing. Currently, each elevator manufacturer has set up an unexpected movement protection device for the sliding of the elevator when the door is opened, but this protection device works based on the condition that the performance of the elevator brake is perfect. It is difficult to ensure that the elevator can be stopped in time when it is equipped with a certain load when the braking force of the brake is insufficient. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art, and provide an elevator load test safety protection device and method, which can effectively solve the problem of unreliable low-speed sliding and stopping during the 1.25-fold rated load test of the elevator.

[0006] To achieve the above purpose, the elevator load test safety protection device described in the present invention includes a controller, a base, a housing, a speed limiter wire rope, an electric push rod, two sliders, two clamp blocks, and two self-locking mechanisms for limiting the clamp blocks;

[0007] Two sliders are located between two clamping blocks. One slider corresponds to one clamping block and one self-locking mechanism. Among them, the slider and the clamping block are slidably connected through a dovetail groove mechanism. A chute is provided on the base, and the bottom of the clamping block is inserted into the chute. The housing is fixed on the base, and the side of the clamping block is connected to the housing through a brake spring. The top of the slider is connected to the housing through a return spring;

[0008] The governor wire rope passes through the base and the housing, and the governor wire rope is located between the two sliders. The two clamping blocks are connected by an electric push rod;

[0009] The controller is connected to the electric push rod and the self-locking mechanism.

[0010] The self-locking mechanism includes a sleeve. A first electromagnet and a second electromagnet are arranged in the sleeve. Among them, a limiting groove is provided at the bottom of the clamping block, and a groove-shaped through hole is formed on the base. The iron cores in the first electromagnet and the second electromagnet can both pass through the groove-shaped through hole and be inserted into the limiting groove. The power control ends of the first electromagnet and the second electromagnet are connected to the controller.

[0011] The electric push rod is connected to the clamping block through a connecting pin.

[0012] A wire guide is provided on the housing. Among them, the governor wire rope passes through the wire guide.

[0013] The base is fixed on the guide rail through a perforated plate and bolts.

[0014] One end of the mounting bracket is hinged to the base, and the other end of the mounting bracket is fixed on the guide rail through bolts and a pressing plate.

[0015] Anti-slip grooves are provided on the slider.

[0016] The sleeve is fixed to the bottom of the base by bolts.

[0017] The middle part of the electric push rod is fixed to the base by bolts and a fixing plate.

[0018] The elevator load test safety protection method of the present invention includes the following steps:

[0019] During the elevator's 1.25 times rated load test, when the controller detects that the elevator has a low-speed slip out of control, the controller issues a start signal, controls the iron core of the first electromagnet in the self-locking mechanism to retract into the sleeve, the brake spring instantaneously expands, pushes the two clamping blocks to slide towards each other in the chute, and the slider moves towards each other with the clamping block and finally contacts the governor wire rope; after the clamping block slides, the iron core of the second electromagnet pops out and is inserted into the limiting groove to lock the clamping block at the preset working position;

[0020] After the speed governor wire rope contacts the slider, the slider is driven downward by friction until it tightly clamps the speed governor wire rope. The elevator continues to descend and the speed governor wire rope pulls the safety clamp to stop the car from sliding.

[0021] When the safety risk of stopping the car is eliminated, the controller sends a completion signal to control the iron core of the second electromagnet in the self-locking mechanism to retract into the sleeve, releasing the working restriction on the clamp block. At the same time, the controller controls the electric push rod to extend and push the clamp block, so that the clamp block returns to its initial position. The iron core in the first electromagnet pops out and is inserted into the limit slot. During the process of resetting the clamp block, the slider returns to its initial position under the action of the reset spring, and finally the electric push rod automatically resets to its original state.

[0022] The present invention has the following beneficial effects:

[0023] During the specific operation of the elevator load test safety protection device and method described in the present invention, when the controller detects that the elevator has lost control of low-speed slippage, the iron core of the first electromagnet in the self-locking mechanism retracts into the sleeve, and the brake spring is instantly expanded, pushing the two clamp blocks to slide toward each other in the slide groove, and the slider moves toward each other with the clamp blocks and finally contacts the speed governor wire rope; after the clamp blocks slide, the iron core of the second electromagnet pops out and is inserted into the limit groove, locking the clamp blocks in the preset working position, and then after the speed governor wire rope contacts the slider, the slider is driven to continue to descend by friction until it is tightly clamped with the speed governor wire rope. The elevator continues to descend, and the speed governor wire rope will pull the safety clamp to stop the car from slipping, effectively solving the problem of unreliable low-speed slippage stopping during the elevator 1.25 times rated load test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 The action state diagram of the present invention;

[0026] Figure 3 Installation diagram of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the rope guide 5.

[0028] Among them, 1 is a slider, 2 is a clamp block, 3 is a brake spring, 4 is a self-locking mechanism, 401 is a first electromagnet, 402 is a second electromagnet, 403 is a sleeve, 5 is a rope guide, 6 is a reset spring, 7 is a fixing plate, 8 is a shell, 9 is a base, 10 is an electric push rod, 11 is a connecting pin, 12 is a mounting frame, 13 is a guide rail, and 14 is a speed limiter wire rope. DETAILED DESCRIPTION

[0029] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present invention disclosed. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessarily confusing the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0030] The structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are only exemplary. In practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0031] Refer to Figures 1 to 4 , the elevator load test safety protection device described in the present invention includes a controller, a base 9, a housing 8, a governor wire rope 14, a power push rod 10, two sliders 1, two clamping blocks 2, and two self-locking mechanisms 4 for limiting the clamping blocks 2;

[0032] The two sliders 1 are located between the two clamping blocks 2. One slider 1 corresponds to one clamping block 2 and one self-locking mechanism 4. Among them, the slider 1 and the clamping block 2 are slidably connected through a dovetail groove mechanism. A chute is provided on the base 9, and the bottom of the clamping block 2 is inserted into the chute. The housing 8 is fixed to the base 9, and the side surface of the clamping block 2 is connected to the housing 8 through a brake spring 3. The top of the slider 1 is connected to the housing 8 through a return spring 6;

[0033] The self-locking mechanism 4 includes a sleeve 403. A first electromagnet 401 and a second electromagnet 402 are arranged in the sleeve 403. Among them, a limiting groove is provided at the bottom of the clamping block 2, and a groove-shaped through hole is opened on the base 9. The iron cores in the first electromagnet 401 and the second electromagnet 402 can both pass through the groove-shaped through hole and be inserted into the limiting groove;

[0034] The governor wire rope 14 passes through the base 9 and the housing 8, and the governor wire rope 14 is located between the two sliders 1. The two clamping blocks 2 are connected through a power push rod 10. Among them, the power push rod 10 is connected to the clamping block 2 through a connecting pin 11.

[0035] A rope guide 5 is provided on the housing 8, wherein the speed governor wire rope 14 passes through the rope guide 5. The base 9 is fixed to the guide rail 13 through a porous plate and bolts. One end of the mounting frame 12 is hinged to the base 9, and the other end of the mounting frame 12 is fixed to the guide rail 13 through bolts and a pressure plate.

[0036] The slider 1 is provided with an anti-slip groove, and the sleeve 403 is fixed to the bottom of the base 9 by bolts. The middle part of the electric push rod 10 is fixed to the base 9 by bolts and a fixing plate 7.

[0037] The elevator load test safety protection method of the present invention comprises the following steps:

[0038] During the 1.25 times rated load test of the elevator, when the controller detects that the elevator is slipping and losing control at low speed, the controller sends a start signal to control the iron core of the first electromagnet 401 in the self-locking mechanism 4 to retract into the sleeve 403, opening the restricted opening working mode of the clamp block 2, and the brake spring 3 opens instantly, pushing the two clamp blocks 2 to slide toward each other in the slide groove. At the same time, the slider 1 moves toward each other with the clamp blocks 2 and finally contacts the speed limiter wire rope 14; the second electromagnet 402 is set to the delayed action mode. After the clamp block 2 slides, the iron core of the second electromagnet 402 pops out and inserts into the limit groove, locking the clamp block 2 at the preset working position, such as Figure 2 shown.

[0039] The end face of the slider 1 is provided with an anti-slip groove. After the wire rope contacts the anti-slip groove, the slider 1 is driven downward by friction until it tightly clamps the speed limiter wire rope 14. The elevator continues to descend, and the speed limiter wire rope 14 will pull the safety clamp to stop the car from sliding.

[0040] When the safety risk of stopping the car is eliminated, the controller sends a completion signal to control the iron core of the second electromagnet 402 in the self-locking mechanism 4 to retract into the sleeve 403, releasing the working restriction of the clamp block 2. At the same time, the controller controls the electric push rod 10 to extend and push the clamp block 2, so that the clamp block 2 returns to its initial position, and the iron core in the first electromagnet 401 pops out and inserts into the limit groove. Figure 1 As shown, during the process of resetting the clamp block 2, the slider 1 returns to its initial position under the action of the reset spring 6, and finally the electric push rod 10 automatically returns to its original state.

[0041] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation methods of the present invention are limited to these. For technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims

1. A safety protection method for elevator load test, characterized in that, Elevator load test safety protection device, the elevator load test safety protection device includes a controller, a base (9), a housing (8), a governor wire rope (14), an electric push rod (10), two sliders (1), two clamping blocks (2), and two self-locking mechanisms (4) for limiting the clamping blocks (2); The two sliders (1) are located between the two clamping blocks (2), one slider (1) corresponds to one clamping block (2) and one self-locking mechanism (4). Among them, the slider (1) and the clamping block (2) are slidably connected through a dovetail groove mechanism. A chute is provided on the base (9), and the bottom of the clamping block (2) is inserted into the chute. The housing (8) is fixed on the base (9), and the side of the clamping block (2) is connected to the housing (8) through a brake spring (3). The top of the slider (1) is connected to the housing (8) through a return spring (6); The governor wire rope (14) passes through the base (9) and the housing (8), and the governor wire rope (14) is located between the two sliders (1). The two clamping blocks (2) are connected through an electric push rod (10); The controller is connected to the electric push rod (10) and the self-locking mechanism (4); The self-locking mechanism (4) includes a sleeve (403). A first electromagnet (401) and a second electromagnet (402) are arranged in the sleeve (403). Among them, a limiting groove is provided at the bottom of the clamping block (2), and a groove-shaped through hole is formed on the base (9). The iron cores in the first electromagnet (401) and the second electromagnet (402) can pass through the groove-shaped through hole and be inserted into the limiting groove. The power control ends of the first electromagnet (401) and the second electromagnet (402) are connected to the controller; Including the following steps: During the 1.25-fold rated load test of the elevator, when the controller detects that the elevator has a low-speed slip out of control, the controller sends a start signal to control the iron core of the first electromagnet (401) in the self-locking mechanism (4) to retract into the sleeve (403). The brake spring (3) instantaneously expands, pushing the two clamping blocks (2) to slide towards each other in the chute. The slider (1) moves towards each other with the clamping block (2) at the same time and finally contacts the governor wire rope (14); after the clamping block (2) slides, the iron core of the second electromagnet (402) pops out and is inserted into the limiting groove to lock the clamping block (2) at the preset working position; After the governor wire rope (14) contacts the slider (1), it drives the slider (1) to continue to move downward through friction until it tightly clamps the governor wire rope (14). The elevator continues to move downward, and the governor wire rope (14) will lift the safety gear to act and stop the car from slipping; When the safety risk of stopping the car is eliminated, the controller sends a completion signal to control the iron core of the second electromagnet (402) in the self-locking mechanism (4) to retract into the sleeve (403), thereby releasing the working restriction of the clamp block (2). At the same time, the controller controls the electric push rod (10) to extend and push the clamp block (2), so that the clamp block (2) returns to the initial position, and the iron core in the first electromagnet (401) pops out and inserts into the limit groove. During the process of resetting the clamp block (2), the slider (1) returns to the initial position under the action of the reset spring (6), and finally the electric push rod (10) automatically returns to the original state. The electric push rod (10) is connected to the clamp block (2) via a connecting pin (11).

2. The elevator load test safety protection method according to claim 1, wherein A rope guide (5) is provided on the housing (8), wherein the speed governor wire rope (14) passes through the rope guide (5).

3. The elevator load test safety protection method according to claim 1, wherein, The base (9) is fixed on the guide rail (13) through a porous plate and bolts.

4. The elevator load test safety protection method according to claim 1, characterized in that, One end of the mounting frame (12) is hinged to the base (9), and the other end of the mounting frame (12) is fixed to the guide rail (13) through bolts and a pressure plate.

5. The elevator load test safety protection method according to claim 1, wherein, The sleeve (403) is fixed to the bottom of the base (9) by bolts.

6. The elevator load test safety protection method according to claim 1, wherein The middle part of the electric push rod (10) is fixed on the base (9) through bolts and a fixing plate (7).

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