A safety maintenance rack for elevator maintenance

Abstract

The present invention belongs to the technical field of maintenance racks and discloses a safe maintenance rack for elevator maintenance. The rack comprises a gantry mechanism, a hoisting mechanism mounted on the gantry mechanism, a multi-section telescopic rack mounted on the hoisting mechanism and configured to extend into the elevator shaft, and a cable mechanism fixed to both ends of the hoisting mechanism for pulling the ends of the multi-section telescopic rack. The present invention provides a working platform that can be extended horizontally into the elevator shaft to a certain length for carrying tools or maintenance personnel. The hoisting mechanism elevates the multi-section telescopic rack to accommodate different working heights. After the multi-section telescopic rack is extended, steps are laid on top and safety guardrail mechanisms are fixed to the left, right, and front ends, allowing operators to freely enter and exit the elevator shaft and between floors. The elevator maintenance rack can be extended inward from the outside of the shaft on any floor side without relying on the elevator car or temporary anchor points.

Description

Technical Field

[0001] The invention belongs to the technical field of maintenance racks, in particular to a safety maintenance rack for elevator maintenance. Background Art

[0002] During elevator maintenance, a maintenance stand is a device used to support workers and related maintenance tools. It comes in fixed vertical forms and on-site, assembled hanging stands, both of which meet safety requirements. Generally, vertical stands are more suitable for maintenance work in the elevator shaft and inside the elevator car. For maintenance work in the middle of the elevator shaft, the assembled stand is connected to fixed anchor brackets or mounted on the ring beam. After the elevator is completed, to avoid interference with car operation, most temporary anchor points installed on the shaft wall are removed, leaving only permanent anchor points at the shaft roof. These are used to connect the safety belts of workers inside the shaft, not to hook the stand. Therefore, the stand's installation relies on the car. Alternatively, temporary anchor points need to be driven in again and removed after maintenance is complete, which is cumbersome. Furthermore, when working on the car roof, workers are prone to inadvertently engaging in dangerous actions, such as leaning over the gap between the car and the shaft wall, or leaning over the car roof and outside the shaft.

[0003] The present application proposes a safety maintenance rack for elevator maintenance, which is used to overcome the above-mentioned defects. Summary of the Invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a safety maintenance frame for elevator maintenance.

[0005] To achieve the above object, the present invention provides the following technical solution: a safety maintenance frame for elevator maintenance, comprising a gantry mechanism and a lifting mechanism, wherein the lifting mechanism is installed on the gantry mechanism;

[0006] A multi-section telescopic frame, the multi-section telescopic frame being mounted on the lifting mechanism and being used to extend into the elevator shaft;

[0007] A stay cable mechanism, which is fixed to both ends of the lifting mechanism and is used to pull the ends of the multi-section telescopic frame;

[0008] The lifting mechanism includes a first movable beam and a second movable beam, both of which are vertically slidably mounted on the gantry mechanism, the multi-section telescopic frame is fixedly mounted on the second movable beam, and the upper end of the inclined cable mechanism is fixedly mounted on the first movable beam;

[0009] Through the gantry mechanism, the horizontal telescopic mechanism composed of multi-section telescopic frames and the lifting mechanism, the maintenance frame can extend a certain length of the working platform horizontally into the elevator shaft for carrying tools or maintenance personnel.

[0010] Preferably, the gantry mechanism further comprises an electric hoist provided at the bottom of the safety maintenance frame, a sling connected to the electric hoist and used to lift the first moving beam, and a binding mechanism fixed on the first moving beam;

[0011] The binding mechanism comprises square steels arranged on the top and bottom parts of the movable crossbeam, and the upper and lower steels are fixedly connected by bolts.

[0012] Preferably, the gantry mechanism includes a steel column and a crossbeam fixed to the top of the steel column, and the crossbeam is provided with a plurality of fixed pulleys. The sling is wound around the fixed pulley and fixedly connected to the binding mechanism downward.

[0013] Preferably, the multi-section telescopic frame comprises a telescopic frame body, at least two sets of lifting ears are provided on both sides of the multi-section telescopic rod of the telescopic frame body, and the inclined cable mechanism is connected to the lifting ears to form a pulling mechanism;

[0014] The ends of the multi-section telescopic frame are all provided with concave irons, and guardrails are fixedly installed on the concave irons.

[0015] Preferably, the inclined cable mechanism includes a cantilever and a zipper, wherein the cantilever is two square steels of different lengths respectively arranged on the top and bottom sides of the first movable crossbeam, and the two square steels are fixedly connected by multiple sets of bolts;

[0016] One end of the zipper is fixed on the rectangular steel, and the other end is connected to the hanging ear.

[0017] Preferably, the gantry mechanism further includes side support frames mounted on the steel columns on both sides, and the front ends of the side support frames are supported on the walls on both sides of the elevator.

[0018] Preferably, the gantry mechanism further includes side support frames installed on the steel columns on both sides. The steel columns are made of concave steel. Rollers are provided at both ends of the side support frames, which are respectively rolled and supported in the grooves of the wall and the steel columns.

[0019] The side support frame and the moving crossbeam are fixedly connected.

[0020] Preferably, the side support frame can be replaced by a column jack.

[0021] Preferably, a multi-section scissor mechanism is provided on the bottom support platform of the safety maintenance frame, and the top of the multi-section scissor mechanism is connected to the telescopic frame body;

[0022] The bottom of the supporting platform is provided with universal wheels.

[0023] Preferably, rollers are provided at both ends of the movable crossbeam 1 and the movable crossbeam 2, and slide rails are provided inside the gantry mechanism, and the rollers are rollingly mounted on the slide rails.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention utilizes a gantry mechanism, a horizontal telescopic mechanism composed of a multi-section telescopic frame, and a hoisting mechanism. A work platform capable of horizontally extending a certain length into the elevator shaft is used to carry tools or maintenance personnel. The hoisting mechanism raises the multi-section telescopic frame to accommodate different working heights. After the multi-section telescopic frame is extended, steps are laid on top, and safety guardrails are fixed to the left, right, and front ends, allowing operators to freely enter and exit the elevator shaft and between floors. The elevator maintenance frame can be extended inward from the outside of the shaft on any floor, without relying on a car or temporary anchor points.

[0026] The structure's stability is ensured by a stay cable mechanism installed on the first movable crossbeam, two sets of long and short square steel bars, and multiple bolts. Zippers are used between the U-shaped lifting ring and the lifting lug to ensure that the load is primarily borne by the zippers, preventing deformation or even breakage of the multi-section telescopic rod when extended. At least two sets of zippers are required at each end of the multi-section telescopic frame, connecting the first and second sections at the front, respectively, to increase the load-bearing capacity and deformation resistance of the central section.

[0027] The side supports are supported by the walls on either side of the elevator door, bearing the front load and preventing tipping. The horizontal section of the side supports can be configured as two nested sections with multiple adjustment levels to accommodate different angles of the maintenance rack. The side supports can also be configured as movable, increasing their support height as the center of gravity of the maintenance rack rises, for optimal support. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a side view of the structure of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the counterweight mechanism and the side support frame of the present invention;

[0031] Figure 4 A top view of the maintenance rack of the present invention extending into the elevator shaft;

[0032] Figure 5 This is a top view of the maintenance stand of the present invention adjusted to an angle and extended into the elevator shaft;

[0033] Figure 6This is a schematic diagram of the recovery structure of the maintenance rack of the present invention;

[0034] Figure 7 This is a top view of the structure without the crossbeam of the present invention;

[0035] Figure 8 For the present invention Figure 7 Schematic diagram of the structure of part A;

[0036] Figure 9 For the present invention Figure 7 Schematic diagram of the structure of part B.

[0037] In the figure: 101, steel column; 102, crossbeam; 103, fixed pulley; 104, side support frame; 105, roller; 201, telescopic frame body; 202, lifting lug; 203, guardrail; 204, multi-section scissor mechanism; 301, electric hoist; 302, lifting rope; 303, binding mechanism; 304, moving crossbeam 1; 305, moving crossbeam 2; 306, roller; 401, cantilever; 402, zipper. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] The first embodiment, as Figures 1 to 6As shown, the present invention provides a safety maintenance frame for elevator maintenance, comprising a gantry mechanism and a lifting mechanism, wherein the lifting mechanism is mounted on the gantry mechanism; a multi-section telescopic frame, wherein the multi-section telescopic frame is mounted on the lifting mechanism and is used to extend into the elevator shaft; and a diagonal cable mechanism, wherein the diagonal cable mechanism is fixed to both ends of the lifting mechanism and is used to pull the ends of the multi-section telescopic frame; wherein the lifting mechanism comprises a moving crossbeam 1 304 and a moving crossbeam 2 305, wherein the moving crossbeam 1 304 and the moving crossbeam 2 305 are both vertically slidably mounted on the gantry mechanism, the multi-section telescopic frame is fixedly mounted on the moving crossbeam 2 305, and the upper end of the diagonal cable mechanism is fixedly mounted on the moving crossbeam 1 304. The gantry mechanism also includes an electric hoist 301 mounted at the bottom of the safety maintenance frame, a sling 302 hooked to the electric hoist 301 to lift a moving beam 304, and a binding mechanism 303 fixed to the moving beam 304. The binding mechanism 303 consists of square steel bars placed at the top and bottom of the moving beam 304, with the top and bottom bars secured together by bolts. The gantry mechanism includes a steel column 101 and a beam 102 fixed to the top of the steel column 101. The beam 102 is equipped with several sets of fixed pulleys 103. The sling 302 is wrapped around the fixed pulleys 103 and fixedly connected downward to the binding mechanism 303. The multi-section telescopic frame includes a telescopic frame body 201. The multi-section telescopic rods of the telescopic frame body 201 are equipped with at least two sets of lifting lugs 202 on either side. The diagonal cable mechanism connects to these lifting lugs 202 to form a pulling mechanism. Each end of the multi-section telescopic frame is equipped with a concave iron, on which a guardrail 203 is fixed. The diagonal cable mechanism includes a cantilever 401 and a zipper 402. The cantilever 401 is two square steel bars of varying lengths, respectively installed at the top and bottom of the moving crossbeam 1 304. The two square steel bars are fixedly connected by multiple sets of bolts. One end of the zipper 402 is fixed to the rectangular steel bar, and the other end is connected to the lifting lug 202. The gantry mechanism also includes side supports 104 mounted on the steel columns 101 on both sides. The front ends of the side supports 104 are supported by the walls on both sides of the elevator.

[0040] In this embodiment, a gantry mechanism, a horizontal telescopic mechanism consisting of a multi-section telescopic frame, and a lifting mechanism are constructed. This maintenance frame differs from a traditional vertical elevator maintenance frame in that it can extend a certain length of work platform horizontally into the elevator shaft for carrying tools or maintenance personnel. The lifting mechanism lifts the multi-section telescopic frame to adapt to different working heights without relying on the elevator car and temporary anchor points. However, if the operator's safety belt needs to be connected to a temporary anchor point, the temporary anchor point must be driven in and connected to the operator's safety belt after completing the relevant fall safety test.

[0041] The core structure consists of a multi-section telescopic frame and a mechanism that drives the frame's vertical lift. After the multi-section telescopic frame is extended, steps are placed on top and safety guardrails are fixed to the left, right, and front ends, allowing workers to freely enter and exit the elevator shaft and between floors. If a protruding ring beam is installed inside the elevator shaft, the front end of the multi-section telescopic frame can be placed on this protruding ring beam, thereby reducing the load on the maintenance frame itself. Regardless of the presence of a ring beam, the diagonal cable mechanism should be fully installed to support the load through diagonal tension.

[0042] The lifting mechanism consists of two parts, a movable crossbeam 1 304 and a movable crossbeam 2 305 , each with different functions. The movable crossbeam 1 304 is primarily used to connect to the sling 302 for lifting with the electric hoist 301 . It is also equipped with a diagonal cable mechanism for diagonally supporting the multi-section telescopic frame. The movable crossbeam 2 305 is primarily used to install the multi-section telescopic frame. The movable crossbeam 1 304 and the movable crossbeam 2 305 are fixedly connected by vertical rods and are independently slidably mounted on the gantry. They move synchronously up and down through the traction of the sling 302 . This arrangement has two advantages. First, the movable crossbeam 1 304 and the movable crossbeam 2 305 increase the number of mounting points between the gantry and the frame, making it easier to maintain the horizontal position of the telescopic frame body 201 and providing greater stability compared to the support of a single movable crossbeam. Second, it creates a height difference between the movable crossbeam 1 304 and the movable crossbeam 2 305 , which is used to install the diagonal cable mechanism.

[0043] The inclined cable mechanism in this application is not installed in a relatively fixed position, but is set on a movable crossbeam 304 that can move up and down. It is fixed by two groups of long and short square steels and multiple groups of bolts to ensure the stability of its own structure. A U-shaped lifting ring is set at the end of the longer square steel, and a zipper 402 is used to pull between the U-shaped lifting ring and the lifting lug 202 to ensure that the load-bearing weight is mainly borne by the zipper 402, preventing the multi-section telescopic frame from structural deformation or even breakage when extended for a long time. At least two groups of zippers 402 need to be set at both ends of the multi-section telescopic frame, respectively connected to the first and second sections at the front end, which also correspondingly improves the load-bearing capacity and anti-deformation ability of the middle part.

[0044] A crossbeam 102 is positioned above the gantry mechanism, and a fixed pulley 103 is mounted on it. This allows the electric hoist 301 to be positioned at the bottom of the safety maintenance frame to pull the multi-section telescopic frame mechanism upward. The electric hoist in this application can be designed for lifting approximately one ton, weighing approximately 100-180 kg. Positioning it at the rear bottom of the maintenance frame lowers the center of gravity and balances the load at the front.

[0045] like Figure 3As shown, the figure discloses an embodiment in which a balancing counterweight block is provided on the rear side of the maintenance frame, where the counterweight block can be used to balance the front end load and maintain the stability of the maintenance frame.

[0046] In addition, side support frames 104 are installed on both sides of the steel column 101. The side support frames 104 are fixedly installed on the outside of the steel column 101, and the other end is supported on the wall to bear the front load, maintain the upright posture of the maintenance frame, and prevent it from tipping over. The horizontal part of the side support frame 104 can be set in a two-section nested form and has multiple levels of adjustment to adapt to different adjustment angles of the maintenance frame, such as Figure 5 shown.

[0047] The side support frame 104 is also provided with diagonal bracing rods for improving the supporting performance.

[0048] The second embodiment, as Figure 7-Figure 9 As shown, the gantry mechanism also includes side support frames 104 mounted on the steel columns 101 on both sides. The steel columns 101 are made of concave steel. Rollers 105 are provided at both ends of the side support frames 104, which are respectively rolled and supported in the grooves of the wall and the steel columns 101.

[0049] The side support frame 104 and the movable cross beam 1 304 are fixedly connected.

[0050] This is the second embodiment of the present application, which changes the configuration of the side support frame 104. In the first embodiment, the side support frame 104 is fixed, and its support position on the wall remains unchanged. It cannot change its support position as the multi-section telescopic frame is raised, nor can it adjust with the center of gravity. Furthermore, when the center of gravity is above the side support frame 104, its stability is relatively poor compared to a side support frame 104 that can adjust with the center of gravity.

[0051] Furthermore, using a fixed position may cause inconvenience depending on the wall conditions on either side of the elevator. For example, some commercial elevators have exterior walls with a certain level difference to create a distinct layering effect. Due to different tile installations, there may be a stepped surface near the elevator door. Therefore, simply fixing the side support frame 104 from above may not fully conform to the wall surface.

[0052] Therefore, in this embodiment, the side support frame 104 is set to a movable state, which can be lifted as the center of gravity of the maintenance frame is lifted, thereby maintaining a better supporting state.

[0053] In the third embodiment, the side support frame 104 can be replaced by a column jack.

[0054] Using a column jack to support the wall can also maintain a stable state. Its advantage is that the telescopic length can be infinitely adjusted and the supporting strength is high. However, each support point needs to be adjusted manually, which is more cumbersome. People in the field can configure it as needed.

[0055] like Figure 2 As shown, a multi-section scissor mechanism 204 is provided on the bottom support platform of the safety maintenance frame, and the top of the multi-section scissor mechanism 204 is connected to the telescopic frame body 201; a universal wheel is provided at the bottom of the support platform.

[0056] Setting up a multi-section scissor mechanism 204 can play an anti-sway effect, which helps to improve the stability of the multi-section telescopic frame as it is lifted. The multi-section scissor mechanism 204 can also be set as a square scissor mechanism, and the relevant field personnel can configure it as needed. Figure 6 In the retracted state of the multi-section telescopic frame shown, the maintenance frame is deformed into a form that occupies a smaller area. In this state, the universal wheels provided at the bottom can cooperate to carry out transfer and movement.

[0057] Both ends of the movable crossbeam 1 304 and the movable crossbeam 2 305 are provided with rollers 306 , and a slide rail is provided inside the gantry mechanism, and the rollers 306 are rollingly installed on the slide rail.

[0058] The working principle and use process of the present invention:

[0059] The maintenance rack is carried to the appropriate floor via another elevator. The multi-section telescopic rack is deployed outside the hoistway, and the steps and guardrails are installed. Zipper 402 is connected. After the lifting test is completed, the multi-section telescopic rack is extended into the hoistway, and the side supports 104 are adjusted to support the walls on both sides of the elevator door. After the operator's safety belt is installed, they enter the hoistway via the steps to work.

[0060] Operators can freely enter and exit the elevator shaft and between floors. When a protruding ring beam is provided inside the elevator shaft, the protruding ring beam can be used to set the front end of the multi-section telescopic frame on the ring beam, thereby reducing the load of the maintenance frame. When the height needs to be increased, the electric hoist 301 is started, which lifts the multi-section telescopic frame through the lifting mechanism, and drives the operators to the corresponding working height for maintenance and repair work. After completion, the staff lowers the multi-section telescopic frame, and the maintenance personnel withdraw to the outside of the shaft. Move the elevator maintenance frame outside the shaft, disassemble the relevant components, and recycle the multi-section telescopic frame.

[0061] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A safety maintenance frame for elevator maintenance, comprising a gantry mechanism, characterized in that: It also includes a lifting mechanism, which is installed on the gantry mechanism; A multi-section telescopic frame, the multi-section telescopic frame being mounted on the lifting mechanism and being used to extend into the elevator shaft; A stay cable mechanism, which is fixed to both ends of the lifting mechanism and is used to pull the ends of the multi-section telescopic frame; The hoisting mechanism comprises a movable crossbeam 1 (304) and a movable crossbeam 2 (305), both of which are vertically slidably mounted on the gantry mechanism, the multi-section telescopic frame is fixedly mounted on the movable crossbeam 2 (305), and the upper end of the inclined cable mechanism is fixedly mounted on the movable crossbeam 1 (304).

2. The safety maintenance stand for elevator maintenance according to claim 1, characterized in that: The gantry mechanism further includes an electric hoist (301) arranged at the bottom of the safety maintenance frame, a sling (302) hooked to the electric hoist (301) and used to lift the first moving beam (304), and a binding mechanism (303) fixed to the first moving beam (304); The binding mechanism (303) comprises square steels mounted on the top and bottom of the first movable crossbeam (304), and the upper and lower steels are fixedly connected by bolts.

3. The safety maintenance frame for elevator maintenance according to claim 2, characterized in that: The gantry mechanism comprises a steel column (101) and a crossbeam (102) fixed to the top of the steel column (101), wherein the crossbeam (102) is provided with a plurality of fixed pulleys (103), and the sling (302) is wound around the fixed pulleys (103) and fixedly connected downwardly to the binding mechanism (303).

4. The safety maintenance stand for elevator maintenance according to claim 2, characterized in that: The multi-section telescopic frame comprises a telescopic frame body (201), at least two groups of lifting ears (202) are provided on both sides of the multi-section telescopic rod of the telescopic frame body (201), and the inclined cable mechanism is connected to the lifting ears (202) to form a pulling mechanism; The ends of the multi-section telescopic frame are all provided with concave irons, and guardrails (203) are fixedly mounted on the concave irons.

5. The safety maintenance stand for elevator maintenance according to claim 4, characterized in that: The inclined cable mechanism comprises a cantilever (401) and a zipper (402), wherein the cantilever (401) is two square steels of different lengths, respectively arranged on the top and bottom sides of the first movable crossbeam (304), and the two square steels are fixedly connected by a plurality of sets of bolts; One end of the zipper (402) is fixed on the rectangular steel, and the other end is connected to the hanging ear (202).

6. The safety maintenance stand for elevator maintenance according to claim 3, characterized in that: The gantry mechanism further comprises side support frames (104) mounted on the steel columns (101) on both sides, and the front ends of the side support frames (104) are supported on the walls on both sides of the elevator.

7. The safety maintenance stand for elevator maintenance according to claim 3, characterized in that: The gantry mechanism further comprises a side support frame (104) mounted on the steel columns (101) on both sides, wherein the steel columns (101) are made of concave steel, and rollers (105) are provided at both ends of the side support frame (104), which are respectively supported by rolling in the grooves of the wall and the steel columns (101); The side support frame (104) and the movable crossbeam 1 (304) are fixedly connected.

8. A safety maintenance stand for elevator maintenance according to claim 6 or 7, characterized in that: The side support frame (104) can be replaced by a column jack.

9. The safety maintenance stand for elevator maintenance according to claim 4, characterized in that: A multi-section scissor mechanism (204) is provided on the bottom support platform of the safety maintenance frame, and the top of the multi-section scissor mechanism (204) is connected to the telescopic frame body (201); The bottom of the supporting platform is provided with universal wheels.

10. The safety maintenance frame for elevator maintenance according to claim 2, characterized in that: Both ends of the movable crossbeam 1 (304) and the movable crossbeam 2 (305) are provided with rollers (306), a slide rail is provided inside the gantry mechanism, and the rollers (306) are rollingly mounted on the slide rail.

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