Bidirectional mechanical trigger type lift car channel safety detection construction hoist

Abstract

The utility model relates to the technical field of lifts, in particular to a bidirectional mechanical trigger type lift car channel safety detection construction lift which comprises a lift car and a guide rail frame and further comprises an ascending channel detection assembly arranged at the top of the lift car and a descending channel detection assembly arranged at the bottom of the lift car. In the ascending process of the lift car, the ascending channel detection assembly touches a foreign matter, the upper portion is pressed, the first limiting switch is triggered, the guide rail frame stops driving the lift car to ascend, and the lift car returns to the initial position after pressure is removed; in the descending process of the lift car, the descending channel detection assembly touches a foreign matter, the lower portion is pressed, the second limiting switch is triggered, the guide rail frame stops driving the lift car to descend, and the lift car returns to the initial position after pressure is removed. Through a bidirectional mechanical trigger structure and an elastic reset design, the device detects foreign matters in an upper channel and a lower channel of the lift car in real time, timely responds and automatically resets, and ensures safe and reliable operation of the construction lift.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hoist, especially to a two -way mechanical trigger type car passageway safety detection construction hoist. BACKGROUND

[0002] With the continuous improvement of the degree of mechanization of building construction, construction hoist as an important equipment of vertical transportation has been widely used in various construction projects. However, there are still some safety hazards and technical shortcomings in the actual operation process of these equipment. Especially in the safety protection of the running channel of the hoist car, the existing technology has not realized the effective detection and real-time response of the foreign matter in the up and down channel, which leads to the failure to take protective measures in time in the event of an emergency, and may cause safety accidents.

[0003] After searching, a kind of hoist emergency detection system with patent number CN110835034B is disclosed. The system realizes the collection of hoist operation site dynamic information, car shaking amplitude, descending speed and chain wear condition and other parameters by setting first field monitoring module, emergency backup module and total control center module, and can start emergency backup module to intervene when data is abnormal. Although the scheme improves the overall safety of the hoist to some extent, it mainly focuses on the monitoring of the running state of the equipment, and does not involve the direct detection function of whether there is an obstacle in the up and down running channel of the car, so there is still obvious deficiency in dealing with the intrusion of channel foreign matter.

[0004] In addition, a hydraulic hoist with emergency protection system with patent number CN105347249B is also searched. The invention realizes deformation sensing under external force by setting flexible sheath and contact strip around the bearing platform and combining sensor and processor, so as to stop the work of driving mechanism immediately when abnormal contact occurs. Although the design can respond to abnormal contact around the bearing platform, its detection range is limited to the edge area of the platform, and cannot cover the whole lifting channel space, especially lacks effective detection means for the intrusion of foreign matter above or below the car.

[0005] The above problems show that the hoist safety detection system on the market at present cannot realize real-time detection and early warning of foreign matter in the up and down running channel, which is difficult to meet the demand of modern construction site for high safety, intelligent lifting equipment, and there is lack of scheme for realizing two-way real-time detection of car up and down channel through mechanical linkage structure in the existing technology, which leads to response lag when foreign matter intrudes. Therefore, the utility model provides a two-way mechanical trigger type car passageway safety detection construction hoist to overcome the above shortcomings and provide a new solution with more accurate, efficient and real-time response capability. UTILITY MODEL CONTENTS

[0006] The utility model provides a kind of two-way mechanical trigger type car passage safety detection construction elevator, to solve the problem of real-time detection and response to foreign matter in the car operating passage in prior art.

[0007] To achieve the above object, the utility model adopts the technical scheme as follows:

[0008] A kind of two-way mechanical trigger type car passage safety detection construction elevator, including car and the guide rail frame connected with the car.The construction elevator further includes the uplink passage detection component being arranged at the top of car and the downlink passage detection component being arranged at the bottom of car.The uplink passage detection component includes the first limit switch being arranged on car and being electrically connected with guide rail frame, first square tube, second square tube and first spring tube, the first square tube is vertically arranged and is fixedly connected with the side rail of fence, second square tube is door type structure, first square tube is sleeved in the bottom of second square tube, second square tube can be moved up and down in first square tube, and second square tube is higher than the top of car.First spring tube is arranged in the middle of second square tube and is above first square tube, the outer diameter of first spring tube is greater than the cross-sectional dimension of first square tube.The downlink passage detection component includes the second limit switch being arranged on car and being electrically connected with guide rail frame.In the process of rising, the uplink passage detection component meets foreign matter, upper part is pressed, triggers first limit switch, so that guide rail frame stops driving car to rise, returns to initial position after pressure removal;In the process of descending, the downlink passage detection component meets foreign matter, lower part is pressed, triggers second limit switch, so that guide rail frame stops driving car to descend, returns to initial position after pressure removal.

[0009] Further, the car includes car body, fence being arranged at the top of car body and C-shaped bending plate being arranged at the bottom of car body.The car body is connected with the driving end of guide rail frame, the uplink passage detection component is arranged on the fence, and the downlink passage detection component is arranged on the C-shaped bending plate.

[0010] Further, the uplink passage detection component further includes first limit switch mounting seat, baffle and bolt fastener.The baffle is arranged at the bottom of first square tube, and the size thereof is greater than the cross-sectional dimension of first square tube, the baffle is provided with an opening in the middle, and the bolt fastener is connected with the tapping in second square tube through the opening.The first limit switch mounting seat is arranged on the fence, and the first limit switch is mounted on the first limit switch mounting seat.

[0011] Further, the second square tube is further provided with stabilizing rod, and the stabilizing rod is parallel to the top crosspiece of second square tube, and the arrangement of stabilizing rod can enhance the structural stability of uplink passage detection component.

[0012] Further, the downlink passage detection assembly further comprises a spring tube mounting plate, a second spring tube, a third party tube and a second limit switch mounting seat.

[0013] Further, the upper surface of the second party tube and the lower surface of the third party tube are both provided with a buffer pad made of high-elastic rubber material. The buffer pad can play a buffering role when the detection assembly collides with foreign matter, reducing damage to the detection assembly and foreign matter.

[0014] Further, the first limit switch and the second limit switch are structurally identical and both comprise a contact module and a signal transmission module. The contact module of the first limit switch is arranged below the baffle, and the contact module of the second limit switch is arranged above the third party tube. The signal transmission module is electrically connected with the guide rail frame.

[0015] Further, the housings of the first limit switch and the second limit switch are designed to be dustproof and waterproof, so as to ensure that the limit switches can work stably and reliably in a harsh construction environment.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model discloses a car top is provided with uplink passage detection assembly, bottom is provided with downlink passage detection assembly, utilizes the mechanical trigger mechanism of first limit switch and second limit switch, can detect the foreign matter in the car ascending and descending passage in real time.

[0018] 2. The uplink passage detection assembly of the utility model adopts the frame type structure formed by the first party tube and the second party tube, and realizes pressure buffering and resetting through the first spring tube, and cooperates with the design of the baffle triggering the limit switch.

[0019] 3.The downlink passage detection assembly of the utility model forms the bottom foreign matter detection structure through the combination of the spring tube mounting plate, the second spring tube and the third party tube.When the car descends and touches the foreign matter, the second spring tube is compressed to drive the third party tube to trigger the limit switch, realizing the sensitive detection of the downlink passage foreign matter, and the reset characteristics of the spring tube can ensure the repeated reliable work of the detection assembly;

[0020] 4.The utility model discloses the high elasticity rubber buffer pad is set on the second party pipe upper surface and third party pipe lower surface, can play the buffering effect when the detection assembly collides with the foreign matter, reduces the damage of the impact force of collision to the foreign matter (such as pipeline, obstacle) and detection assembly, improves the practicality and compatibility of device;

[0021] 5.The limit switch of the utility model adopts the dustproof and waterproof shell, and integrates the contact module and the signal transmission module, can work stably in the bad construction environment such as damp and dusty, guarantees the reliability of signal transmission, solves the problem that the traditional detection device is easy to fail under complex working conditions;

[0022] 6.The utility model discloses the stabilizer bar is set up on the second party pipe, strengthens the anti-overturning ability and structural stability of the uplink detection assembly, avoids the false triggering or detection failure caused by the shaking of detection assembly, improves the mechanical strength and durability of device. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the whole structure schematic diagram of the utility model.

[0024] Figure 2 It is the structure schematic diagram of the uplink passage detection assembly of the utility model.

[0025] Figure 3 It is the Figure 2 Enlarged structure schematic diagram of the utility model in A place.

[0026] Figure 4 It is the structure schematic diagram of the downlink passage detection assembly of the utility model.

[0027] In the above drawing, the corresponding component name of the reference sign is as follows:

[0028] 1, car; 101, car body; 102, fence; 103, C-shaped bent plate; 2, guide rail frame; 3, uplink passage detection assembly; 301, first limit switch; 302, first square tube; 303, second square tube; 304, first spring tube; 305, first limit switch mounting seat; 306, baffle; 307, bolt fastener; 308, stabilizer bar; 4, downlink passage detection assembly; 401, second limit switch; 402, spring tube mounting plate; 403, second spring tube; 404, third square tube; 405, second limit switch mounting seat; 5, buffer pad; 6, contact module; 7, signal transmission module; 8, protective fence. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more features. In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "up", "down", "front", "back", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application. The indicated device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0031] EMBODIMENT

[0032] As Figures 1 to 4 shown, the utility model provides a kind of two-way mechanical trigger type car passage safety detection construction hoist, and its specific implementation mode is explained in detail in combination with drawing.

[0033] With reference Figure 1 , the two-way mechanical trigger type car passage safety detection construction hoist of the utility model is mainly composed of car 1, guide rail frame 2, uplink passage detection assembly 3 and downlink passage detection assembly 4.Car 1 is connected with guide rail frame 2, for driving car 1 to carry out ascending and descending movement.Uplink passage detection assembly 3 is arranged at the top of car 1, and downlink passage detection assembly 4 is arranged at the bottom of car 1, and they are used for detecting whether there is foreign matter in ascending and descending passage of car 1 respectively.The periphery of the construction hoist is provided with protective fence 8.Uplink passage detection assembly 3 and downlink passage detection assembly 4 can be additionally provided with multiple according to needs.

[0034] The car 1 comprises a car body 101, a fence 102 arranged on the top of the car body 101, and a C-shaped bent plate 103 arranged on the bottom of the car body 101. The car body 101 is connected with the driving end of the guide rail frame 2, the fence 102 plays a protective role to prevent people or objects from falling from the top of the car. The C-shaped bent plate 103 provides a mounting base for the downward passage detection assembly 4.

[0035] Referring to Figure 2 , Figure 3 The upward passage detection assembly 3 comprises a first limit switch 301, a first square tube 302, a second square tube 303, a first spring tube 304, a first limit switch mounting seat 305, a baffle 306, and a bolt fastener 307.

[0036] The first square tube 302 is arranged vertically and fixedly connected with the side column of the fence 102, and the second square tube 303 has a door-shaped structure. The first square tube 302 is sleeved on the bottom end of the second square tube 303, and the second square tube 303 can move up and down in the first square tube 302. The second square tube 303 is higher than the top of the fence 102, so that it can contact the foreign matter in the passage before the car 1 rises.

[0037] The first spring tube 304 is arranged in the middle of the second square tube 303 and above the first square tube 302. The outer diameter of the first spring tube 304 is larger than the cross-sectional dimension of the first square tube 302, and the first spring tube 304 plays a role of buffering and resetting. The baffle 306 is arranged at the bottom of the first square tube 302, and its size is larger than the cross-sectional dimension of the first square tube 302. The baffle 306 is provided with an opening in the middle, and the bolt fastener 307 is connected with the tapping in the second square tube 303 through the opening to fix the baffle 306 on the second square tube 303.

[0038] The first limit switch mounting seat 305 is arranged on the fence 102, and the first limit switch 301 is mounted on the first limit switch mounting seat 305. The second square tube 303 is also provided with a stabilizing rod 308 which is parallel to the top horizontal bar of the second square tube 303. The stabilizing rod 308 is made of metal and is fixed at both ends with the two vertical rods of the second square tube 303 by welding, so as to enhance the structural stability of the upward passage detection assembly 3.

[0039] In the process of the construction elevator being at rest or normally rising, the upward passage detection assembly 3 is in an initial state. At this time, the first spring tube 304 is in a natural stretched state, the second square tube 303 is located at a relatively high position in the first square tube 302, and is higher than the top of the fence 102. The first limit switch 301 is not triggered, and the contact module 6 thereof is in an open state. The signal transmission module 7 does not send a stop signal to the guide rail frame 2, and the guide rail frame 2 normally drives the car 1 to rise.

[0040] When the cage 1 is ascending, the second side pipe 303, as the front end of the detection assembly, will contact the foreign matter in the passage before the cage 1. Since the second side pipe 303 is in a door-shaped structure and higher than the top of the fence 102, it can detect the passage above the cage 1 in a larger range. Once the top horizontal bar or the side of the second side pipe 303 contacts the foreign matter, the foreign matter will exert a downward pressure on the second side pipe 303.

[0041] After being subjected to the downward pressure of the foreign matter, the second side pipe 303 will move downward in the first side pipe 302. Since the first spring pipe 304 is arranged in the middle of the second side pipe 303 and above the first side pipe 302, at this time, the first spring pipe 304 will be compressed and store elastic potential energy. With the downward movement of the second side pipe 303, the baffle 306 fixedly connected thereto through the bolt fastener 307 will also move downward synchronously. When the baffle 306 moves downward to a certain position, it will touch the contact module 6 of the first limit switch 301, causing the contact module 6 to close.

[0042] After the contact module 6 is closed, the signal transmission module 7 of the first limit switch 301 will immediately transmit a trigger signal to the guide rail frame 2. After receiving the signal, the guide rail frame 2 will quickly stop driving the cage 1 to ascend, thereby avoiding further collision between the cage 1 and the foreign matter and ensuring the safe operation of the construction elevator.

[0043] When the worker removes the foreign matter in the passage, the pressure acting on the second side pipe 303 disappears. At this time, the first spring pipe 304 in the compressed state will release the elastic potential energy and push the second side pipe 303 to move upward in the first side pipe 302, returning to the initial relatively high position. At the same time, the baffle 306 will also move upward with the upward movement of the second side pipe 303, leaving the contact module 6 of the first limit switch 301, causing the contact module 6 to be disconnected again. In this way, the upward passage detection assembly 3 returns to the initial state and waits for the next detection task.

[0044] Referring to Figure 4 , the downward passage detection assembly 4 includes a second limit switch 401, a spring pipe mounting plate 402, a second spring pipe 403, a third side pipe 404, and a second limit switch mounting seat 405.

[0045] The spring tube mounting plate 402 is fixed on the C-shaped bent plate 103 by bolts, the second spring tube 403 is vertically arranged and one end is fixed on the spring tube mounting plate 402, and the third spring tube 404 is connected with the other end of the second spring tube 403 perpendicularly. The second limit switch mounting seat 405 is L-shaped, one end is connected with the C-shaped bent plate 103 by bolts, and the second limit switch 401 is arranged on the second limit switch mounting seat 405. The first spring tube 304 and the second spring tube 403 are made of stainless steel, and the spring tube has an elastic coefficient of 50-100 N / mm, so that the detection assembly can be quickly reset after triggering the limit switch under pressure and keep long-term elastic stability.

[0046] In the process of the construction elevator being in a static state or normal descending, the downward passage detection assembly 4 is in an initial state. The spring tube mounting plate 402 is fixed on the C-shaped bent plate 103 by bolts, thereby providing a stable mounting base for the entire downward passage detection assembly 4. The second spring tube 403 is vertically arranged and one end is fixed on the spring tube mounting plate 402, thereby being in a natural stretching state. The third spring tube 404 is connected with the other end of the second spring tube 403 perpendicularly and is located at a normal detection position. The second limit switch mounting seat 405 is L-shaped, one end is connected with the C-shaped bent plate 103 by bolts, and the second limit switch 401 is mounted on the second limit switch mounting seat 405, thereby making the contact module 6 of the second limit switch 401 in an open state, the signal transmission module 7 does not send a stop signal to the guide rail frame 2, and the guide rail frame 2 normally drives the car 1 to descend.

[0047] When the car 1 descends, the third spring tube 404 as a front end component of the downward passage detection will contact the foreign matter in the passage earlier than the car 1. Since the third spring tube 404 is located at the bottom of the car 1, the third spring tube 404 can detect the passage below the car 1. Once the lower surface of the third spring tube 404 collides with the foreign matter, the foreign matter will exert an upward pressure on the third spring tube 404.

[0048] After being subjected to the upward pressure of the foreign matter, the third spring tube 404 moves upward, thereby compressing the second spring tube 403 connected therewith. Since the second spring tube 403 is made of stainless steel and has an elastic coefficient of 50-100 N / mm, the second spring tube 403 can be elastically deformed and store elastic potential energy when being compressed. With the compression of the second spring tube 403, the two second spring tubes 403 move upward as a whole. When the second spring tube 403 moves upward to a certain position, the contact module 6 of the second limit switch 401 is triggered, thereby making the contact module 6 closed.

[0049] After the contact module 6 is closed, the signal transmission module 7 of the second limit switch 401 immediately transmits a triggering signal to the guide rail frame 2. After receiving the signal, the guide rail frame 2 quickly stops driving the car 1 to descend, thereby avoiding further collision between the car 1 and the foreign matter and ensuring the operation safety of the construction elevator.

[0050] When the staff removes the foreign matter in the passage, the pressure acting on the third party pipe 404 disappears. At this time, the second spring pipe 403 in the compressed state releases the elastic potential energy, pushing the third party pipe 404 to move downward to return to the initial detection position. Under the elastic action of the second spring pipe 403, the third party pipe 404 can quickly reset, and due to the stable elastic coefficient of the second spring pipe 403, the long-term elastic stability can be maintained, ensuring that the downward passage detection assembly 4 can continuously and reliably work. With the third party pipe 404 returning to the initial position, the second spring pipe 403 returns to the natural stretched state, the contact module 6 of the second limit switch 401 is disconnected again, and the downward passage detection assembly 4 returns to the initial state, waiting for the next detection task.

[0051] The upper surface of the second party pipe 303 and the lower surface of the third party pipe 404 are provided with a buffer pad 5, and the buffer pad 5 is made of high-elasticity rubber material. When the detection assembly encounters a foreign matter, the buffer pad 5 can play a buffering role, reducing the damage to the detection assembly and the foreign matter.

[0052] The first limit switch 301 and the second limit switch 401 are the same in structure, and both include a contact module 6 and a signal transmission module 7. The contact module 6 of the first limit switch 301 is arranged below the baffle 306, and the contact module 6 of the second limit switch 401 is arranged above the third party pipe 404. The signal transmission module 7 is electrically connected with the guide rail frame 2, and the housings of the first limit switch 301 and the second limit switch 401 are designed with dustproof and waterproof, and the housings of the first limit switch 301 and the second limit switch 401 reach the IP67 standard, which can effectively prevent dust from entering and water from splashing, so as to ensure that the limit switch can work stably and reliably in a harsh construction environment.

[0053] In summary, the upward passage detection assembly 3 and the downward passage detection assembly 4 are arranged, real-time detection and response to the foreign matter in the upward and downward passages of the car 1 are realized, safety accidents caused by collision with foreign matter are effectively avoided, and the safety and reliability of the construction elevator operation are improved.

[0054] It should be noted that the standard parts used in the present application can be purchased from the market, and can be customized according to the description and drawings. The specific connection mode of each part adopts the conventional means such as bolt, rivet and welding in the prior art. The mechanical parts and equipment adopt the conventional type in the prior art. The control mode is automatically controlled by the controller. The control circuit of the controller can be realized by simple programming of the person skilled in the art. It belongs to the common knowledge in the art. And the present application is mainly used to protect the mechanical device, so the control mode and circuit connection are not explained in detail.

[0055] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Any skilled person in the art can make some minor changes or modifications to the disclosed technical content without departing from the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiments based on the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A bidirectional mechanically triggered car passage safety inspection construction hoist, comprising a car (1) and a guide rail frame (2) connected to the car (1), characterized in that, It also includes an upward passage detection component (3) installed on the top of the car (1) and a downward passage detection component (4) installed at the bottom of the car (1); the upward passage detection component (3) includes a first limit switch (301) installed on the car and electrically connected to the guide rail frame (2), a first square tube (302), a second square tube (303) and a first spring tube (304), the first square tube (302) is vertically installed and fixedly connected to the side rail of the railing (102), the second square tube (303) has a door-shaped structure, the first square tube (302) is sleeved on the bottom end of the second square tube (303), the second square tube (303) can move up and down inside the first square tube (302), and the second square tube (303) is higher than the top of the car (1); the first spring tube (304) is installed in the middle of the second square tube (303) and Located above the first square tube (302), the outer diameter of the first spring tube (304) is larger than the cross-sectional size of the first square tube (302), and the first limit switch (301) is located below the second square tube (303); the downward channel detection component (4) includes a second limit switch (401) installed on the car and electrically connected to the guide rail frame; during the upward movement of the car (1), the upward channel detection component (3) encounters a foreign object, and the upper part is pressed, triggering the first limit switch (301), causing the guide rail frame (2) to stop driving the car (1) to rise, and returning to the initial position after the pressure is removed; during the downward movement of the car (1), the downward channel detection component (4) encounters a foreign object, and the lower part is pressed, triggering the second limit switch (401), causing the guide rail frame (2) to stop driving the car (1) to fall, and returning to the initial position after the pressure is removed.

2. The bidirectional mechanically triggered car passage safety inspection construction hoist according to claim 1, characterized in that, The car (1) includes a car body (101), a railing (102) on the top of the car body, and a C-shaped bending plate (103) on the bottom of the car body; the car body (101) is connected to the drive end of the guide rail frame (2), the upward channel detection component (3) is set on the railing (102), and the downward channel detection component (4) is set on the C-shaped bending plate (103).

3. The bidirectional mechanically triggered car passage safety inspection construction hoist according to claim 2, characterized in that, The uplink channel detection component (3) further includes a first limit switch mounting base (305), a baffle (306), and a bolt fastener (307); the baffle (306) is located at the bottom of the first square tube (302), the size of the baffle (306) is larger than the cross-sectional size of the first square tube (302), and an opening is provided in the middle of the baffle (306), through which the bolt fastener (307) passes and is connected to the tapping thread inside the second square tube (303); the first limit switch mounting base (305) is located on the fence (102), and the first limit switch (301) is mounted on the first limit switch mounting base (305).

4. The bidirectional mechanically triggered car passage safety inspection construction hoist according to claim 3, characterized in that, The second square tube (303) is also provided with a stabilizing rod (308), which is parallel to the top horizontal bar of the second square tube (303).

5. A bidirectional mechanically triggered car passage safety inspection construction hoist according to claim 2, characterized in that, The downlink channel detection assembly (4) further includes a spring tube mounting plate (402), a second spring tube (403), a third tube (404), and a second limit switch mounting base (405); the spring tube mounting plate (402) is fixed to the C-shaped bending plate (103) by bolts, the second spring tube (403) is vertically arranged and one end is fixed to the spring tube mounting plate (402), and the third tube (404) is vertically connected to the other end of the second spring tube (403); the second limit switch mounting base (405) is L-shaped, one end of which is connected to the C-shaped bending plate (103) by bolts, and the second limit switch (401) is set on the second limit switch mounting base (405).

6. A bidirectional mechanically triggered car passage safety inspection construction hoist according to claim 3 or 5, characterized in that, The upper surface of the second square tube (303) and the lower surface of the third square tube (404) are provided with buffer pads (5), which are made of highly elastic rubber material.

7. A bidirectional mechanically triggered car passage safety inspection construction hoist according to any one of claims 1-5, characterized in that, The first limit switch (301) and the second limit switch (401) have the same structure, both including a contact module (6) and a signal transmission module (7). The contact module (6) of the first limit switch (301) is located below the baffle (306), and the contact module (6) of the second limit switch (401) is located above the third tube (404). The signal transmission module (7) is electrically connected to the guide rail frame (2).

8. A bidirectional mechanically triggered car passage safety inspection construction hoist according to claim 7, characterized in that, The housings of the first limit switch (301) and the second limit switch (401) are designed to be dustproof and waterproof.

Images