A retrofit elevator shallow pit protection device

Abstract

The application provides an elevator shallow pit protection device, which comprises an elevator car, a first supporting platform arranged at the bottom end of the elevator car, a second supporting platform arranged at the bottom end of the shallow pit, a forward-reverse screw arranged on the second supporting platform, a driving motor arranged at one end of the forward-reverse screw, guide blocks respectively coated on the forward-reverse screw of the forward-reverse screw, two-section slide rods arranged at the two ends of the guide blocks, and a movable rod arranged between the two-section slide rods and the first supporting platform. The driving motor drives the forward-reverse screw to rotate, and then drives the guide blocks and the slide rods to move close to or away from each other, so that the movable rod changes the inclination angle, and the first supporting platform is lifted or lowered. When the screw at one end of the forward-reverse screw slips or is damaged, the screw at the other end of the forward-reverse screw can continue to drive the movable rod to support the first supporting platform, thereby solving the problem of poor safety performance of the shallow pit protection device in the prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of elevator maintenance, and in particular to a device for installing a shallow pit protection device for elevators. Background Technology

[0002] Installing a shallow pit protection device for elevators is a solution for existing or older residential buildings where the pit depth is insufficient due to building design, failing to meet elevator inspection safety technical specifications and mandatory standards. It primarily overcomes installation difficulties by reducing the depth and height of the elevator machine room. However, when repairing elevators with shallow pits, limited space necessitates maintenance personnel entering the pit to support the elevator car using simple devices like steel pipes. This presents significant safety hazards for maintenance personnel entering the pit for repairs.

[0003] A utility model patent, titled "An Automated Elevator Shallow Pit Inspection and Protection Device," with publication number CN219448912U, is disclosed in the prior art. It includes a lifting device, a support frame, a motor, a slide rail, a rotating shaft, a screw, a hinge rod, and a slider, etc. The motor drives the rotating shaft to rotate, which in turn causes the screw to move the slider, thereby enabling the hinge rod to lift the lifting device.

[0004] However, when the screw in the patent application specification slips or is damaged, it can no longer provide support for the lifting device, and the loss of support by the protective device will endanger maintenance personnel. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art that when the screw slips or is damaged, it cannot continue to provide support for the lifting device, and the loss of support force of the protection device will endanger the maintenance personnel.

[0006] To achieve the above objectives, this application proposes an elevator pit protection device, comprising: an elevator car; a first support platform at the bottom of the elevator car; a second support platform at the bottom of the pit; a positive and negative lead screw on the second support platform; a drive motor at one end of the positive and negative lead screw; guide blocks covering the positive and negative leads respectively on the positive and negative leads; two-section sliding rods at both ends of the guide blocks; and a movable rod between the two-section sliding rods and the first support platform.

[0007] This application uses a drive motor to rotate the positive and negative lead screws, which in turn causes the guide block and slide rod to move closer or further apart, thereby changing the tilt angle of the movable rod and raising or lowering the first support platform. In the event that the lead screw at one end slips or is damaged, the lead screw at the other end can continue to drive the movable rod to support the first support platform, thus solving the problem of poor safety performance of shallow pit protection devices in the prior art.

[0008] As an improvement to the aforementioned movable rod in this application, in order to meet the requirement of changing the tilt angle of the movable rod, the movable rod includes: a rod body; hollow steel pipes disposed at both ends of the rod body; and a limiting plate disposed on the hollow steel pipe near the first support platform.

[0009] Furthermore, in order to connect the rod body to the first support platform, a fixing plate is provided on the end face of the first support platform away from the elevator car.

[0010] Furthermore, in order to fix the rod body and change the inclination angle of the movable rod when the sliding rod moves closer or further away, the hollow steel pipe close to the first support platform passes through the fixing plate and is fixed by the limiting plate set on the hollow steel pipe, and the hollow steel pipe set at the other end of the rod body covers the two-section sliding rod.

[0011] Furthermore, in order to keep the slide bar stable during movement, a support frame is provided on the end face of the second support platform near the elevator car; the two-section slide bar set between the support frames is connected to the support frames by a slider.

[0012] As an improvement to the aforementioned support frame, in order to limit the movement trajectory of the slider, guide grooves are provided on opposite sides of the support frame, and the slider is embedded in the guide grooves.

[0013] As an improvement to the aforementioned positive and negative leadscrews, in order to facilitate replacement in case of device damage and to allow the guide block to disengage from the positive and negative leadscrews, the end of the positive and negative leadscrews away from the drive motor is not threaded.

[0014] The beneficial effects of this application are as follows:

[0015] 1. The elevator shallow pit protection device installed in this application uses a drive motor to drive the positive and negative lead screws to rotate, which in turn drives the guide block and slide rod to move closer or further away, thereby changing the tilt angle of the movable rod and realizing the lifting or lowering of the first support platform. In this case, if the lead screw at one end slips or is damaged, the lead screw at the other end can continue to drive the movable rod to support the first support platform, thus solving the problem of poor safety performance of shallow pit protection devices in the prior art.

[0016] 2. The elevator pit protection device of this application is equipped with a first support platform, wherein two movable rods are connected to both sides of the first support platform. When the forward and reverse screws rotate, the two movable rods change their angles simultaneously, so as to realize the raising or lowering of the first support platform without changing the lateral position of the first support platform.

[0017] 3. The elevator pit protection device of this application has a second support platform at the bottom of the pit. By increasing the contact area between the device and the bottom of the pit, the friction is increased, making the whole device more stable.

[0018] 4. The elevator shallow pit protection device of this application is equipped with a support frame and guide rail, which can keep the slide rod horizontal during the movement, thereby improving the stability of the device and the durability of the slide rod and slider, and preventing the slide rod and slider from being damaged due to failure to keep horizontal.

[0019] 5. The elevator shallow pit protection device of this application does not have threads at the ends of the positive and negative screws, so that when the guide block moves to the unthreaded part, it can disengage from the positive and negative screws more quickly, thereby realizing the disassembly of the entire device and improving the convenience of maintenance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a structure for installing a shallow pit protection device for elevators according to an embodiment of this application;

[0022] Figure 2 This is a structural schematic diagram from another perspective of an embodiment of the present application for an elevator shallow pit protection device;

[0023] Figure 3 This is a schematic diagram of the installation of the fixing plate in an embodiment of this application;

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Elevator car;

[0026] 2. First Support Platform;

[0027] 3. Second support platform;

[0028] 4. Positive and negative lead screws;

[0029] 5. Drive motor;

[0030] 6. Guide block;

[0031] 7. Two-section sliding rod;

[0032] 8. Movable rod; 81. Rod body; 82. Hollow steel pipe; 83. Limiting plate;

[0033] 9. Fixing plate;

[0034] 10. Support frame;

[0035] 11. Slider. Detailed Implementation

[0036] The following will be combined with the appendix Figures 1-3 The embodiments of the technical solutions of this application are described in detail below. The following embodiments are only used to more clearly illustrate the technical solutions of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other. Example 1:

[0037] like Figures 1-2 This illustration depicts a shallow pit protection device for elevators according to this application. To improve the safety performance of the shallow pit protection device, the device uses a drive motor 5 to rotate a positive and negative lead screw 4. The positive and negative lead screw 4 is designed with threads on both its positive and negative sides, and guide blocks 6 are respectively wrapped around the positive and negative threads of the positive and negative lead screw 4. When the drive motor 5 starts, the positive and negative lead screw 4 rotates, causing the guide blocks 6 to move along the lead screw. The movement of the guide blocks 6 further pushes the two-section sliding rod 7 to move closer or further away.

[0038] Furthermore, since the two-section slide bar 7 is connected to the movable rod 8, the inclination angle of the movable rod 8 changes accordingly, thereby raising or lowering the first support platform 2. This design ensures that when the thread at one end of the lead screw 4 slips or is damaged, the thread at the other end can still drive the movable rod 8 to support the first support platform 2, effectively avoiding support failure caused by lead screw damage and significantly improving the safety performance of the shallow pit protection device.

[0039] Optionally, two movable rods 8 (including rod body 81, hollow steel pipe 82 and limiting plate 83); two pairs of fixing plates 9 for fixing the ends of the movable rods 8; and two sliding rods (i.e. two-section sliding rods 7) for connecting the other end of the movable rods 8 form a set of support components. One or more sets of support components can be selected according to the size specifications of the elevator car 1 and the specific space of the shallow pit to deal with the support problem of elevator cars 1 of different weights. Example 2:

[0040] Continue to refer to Figure 2 and Figure 3 In a further embodiment, in order to achieve smooth lifting and lowering of the first support platform 2, two movable rods 8 are connected to both sides of the first support platform 2. The movable rod 8 consists of a rod body 81, hollow steel pipes 82 set at both ends of the rod body, and a limiting plate 83.

[0041] In this embodiment, when the lead screw 4 rotates, the two-section slide rod 7 drives one end of the hollow steel pipe 82 to move. Since the other end of the hollow steel pipe 82 is fixed to the fixed plate 9 by the limiting plate 83, the tilt angle of the movable rod 8 will change accordingly. This design allows the two movable rods 8 to change their angles simultaneously, thereby achieving a smooth rise or fall of the first support platform 2 without changing its lateral position.

[0042] Optionally, the limiting plate 83 may be disposed between two opposing fixed plates 9, or on the outside of two opposing fixed plates 9, in order to limit the lateral displacement of the hollow steel pipe 82 on the fixed plate 9. Example 3:

[0043] Please continue to refer to Figure 3 To improve the stability of the device, a second support platform 3 is installed at the bottom of the shallow pit. By increasing the contact area between the device and the bottom of the pit, the friction is increased, making the entire device more stable during operation. The second support platform 3 not only provides stable support for the device, but also makes the entire structure more evenly stressed, avoiding structural damage caused by excessive stress at a single point. Example 4:

[0044] In this embodiment, to maintain the stability of the slide bar during movement, a support frame 10 is provided on the end face of the second support platform 3 near the elevator car 1. The two-section slide bar 7 arranged between the support frames 10 is connected to the support frames 10 by a slider 11. Guide grooves 101 are provided on opposite sides of the support frame 10, and the slider 11 is embedded in the guide grooves. This design ensures that the slide bar 7 remains horizontal during movement, avoiding the problem of unstable movement caused by the tilting of the slide bar 7. At the same time, keeping the slide bar 7 horizontal also improves the durability of the slide bar 7 and the slider 11, preventing damage due to the inability to maintain horizontality. Example 5:

[0045] In this embodiment, to improve ease of maintenance, no threads are provided at the ends of the lead screws 4. This design allows the guide block 6 to disengage from the lead screws 4 more quickly when it moves to the unthreaded section, thus enabling the disassembly of the entire device. This design not only simplifies the disassembly process but also improves the ease of maintenance. When the device malfunctions and requires repair, staff can disassemble the device more quickly to troubleshoot and repair, thereby shortening maintenance time and improving work efficiency.

[0046] In the description of the embodiments of this application, the technical terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0047] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "set," "equipped with," "connected," and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions 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. A device for installing a shallow pit protection system for elevators, comprising: An elevator car (1) is characterized in that a first support platform (2) is provided at the bottom of the elevator car (1); a second support platform (3) is provided at the bottom of the shallow pit; a positive and negative lead screw (4) is provided at the top of the second support platform (3); a drive motor (5) is provided at one end of the positive and negative lead screw (4); guide blocks (6) covering the positive and negative leads are provided on the positive and negative leads of the positive and negative leads (4); two-section slide rods (7) are provided at both ends of the guide blocks (6); and a movable rod (8) is provided between the two-section slide rods (7) and the first support platform (2).

2. The elevator shallow pit protection device according to claim 1, characterized in that, The movable rod (8) includes: a rod body (81); hollow steel pipes (82) disposed at both ends of the rod body (81); and a limiting plate (83) disposed on the hollow steel pipe (82) near the first support platform (2).

3. The elevator shallow pit protection device according to claim 1, characterized in that, A fixing plate (9) is provided on the end face of the first support platform (2) away from the elevator car (1).

4. The elevator shallow pit protection device according to claim 3, characterized in that, The hollow steel pipe (82) near the first support platform (2) passes through the fixing plate (9) and is fixed by the limiting plate (83) set on the hollow steel pipe (82). The hollow steel pipe (82) set at the other end of the rod (81) covers the two-section slide rod (7).

5. The elevator shallow pit protection device according to claim 1, characterized in that, A support frame (10) is provided on the end face of the second support platform (3) near the elevator car (1); a two-section slide bar (7) provided between the support frames (10) is connected to the support frame (10) through a slider (11).

6. The elevator shallow pit protection device according to claim 5, characterized in that, The support frame (10) has guide grooves (101) on its two opposite sides, and the slider (11) is embedded in the guide grooves (101).

7. The elevator shallow pit protection device according to claim 1, characterized in that, The end of the positive and negative lead screw (4) away from the drive motor (5) is not threaded.

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