Safety net suspension device in an elevator shaft and method of use thereof

Abstract

The application relates to a kind of safety net suspension devices in elevator shaft, including chassis, two wall outside fixed arms, two screw rod support seats, two rotating support seats, two cantilever main rods, two cantilever rods, nylon connecting ropes and safety nets, the chassis is fixedly connected by front cross bar, rear cross bar and two side rods, and mobile wheels are fixedly installed at the bottom; two wall outside fixed arms are fixedly connected with two side rods at one end respectively, and the other end is cantilevered outward to the left and right outside of two side rods, and the outward end is threadedly connected with first screw rods; two screw rod support seats are symmetrically fixedly installed on two side rods and located in front of wall outside fixed arms, and second screw rods are threadedly connected on two screw rod support seats, the safety net suspension device is moved to elevator shaft door opening to completely unfold the safety net, and the safety net can be quickly set, the safety net setting operation is simple, manual operation is not needed in elevator shaft, and the safety hidden danger of safety net installation and removal is greatly reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building engineering construction, and particularly relates to a safety net suspension device in an elevator shaft and a use method thereof. BACKGROUND

[0002] In the field of building engineering construction, a reinforced concrete elevator shaft is a hollow cylinder that is permeable from top to bottom, and there is a risk of falling from a high altitude during the construction process. The safety net is arranged in the cylinder according to a certain interval according to the safety specification, and the safety net is usually hung from the second floor, and a safety net is arranged every 10 meters (or three floors) upwards to prevent safety accidents.

[0003] The traditional method of arranging the safety net is to pre-bury netting steel bars on the inner wall of the elevator shaft, and then fix the safety net on the netting steel bars by manual operation. This method needs manual operation in the hollow cylinder of the elevator shaft, and the operation is difficult, and there are serious safety hazards in the installation and removal processes of the safety net. SUMMARY

[0004] The main purpose of the application is to provide a safety net suspension device in an elevator shaft and a use method thereof, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the application is implemented by the following technical scheme:

[0006] A safety net suspension device in an elevator shaft, comprising

[0007] A chassis is fixedly connected by a front cross rod, a rear cross rod and two side rods, and has a rectangular structure. A moving wheel is fixedly installed at the bottom of the chassis.

[0008] Two wall-outside fixing arms are fixedly connected at one end to the two side rods respectively, and are cantilevered outward at the other end to the left and right outside of the two side rods. A first screw rod is threadedly connected at one end of the cantilevered outward end. The first screw rod is used to abut against the outer wall of the elevator shaft.

[0009] Two screw rod supporting seats are symmetrically fixedly installed on the two side rods and located in front of the wall-outside fixing arms. A second screw rod is threadedly connected to the two screw rod supporting seats. The second screw rod is used to abut against the inner side wall of the door opening of the elevator shaft.

[0010] Two rotating supporting seats are fixedly installed on the front cross rod in a left-right symmetrical manner.

[0011] Two cantilever main rods have a first end and a second end. The first end of each cantilever main rod is rotatably connected to the two rotating supporting seats. The cantilever main rod can be rotated to be perpendicular or parallel to the front cross rod. When the cantilever main rod is parallel to the front cross rod, the second end of the cantilever main rod is cantilevered outward to the left and right outside of the front cross rod. The two cantilever main rods are used to abut against the inner wall of the elevator shaft.

[0012] Two cantilever rods, one end of each of which is rotatably connected to the front side of the second end of the two cantilever main rods, and the cantilever rods can be rotated to be perpendicular or parallel to the cantilever main rods;

[0013] A nylon connecting rope, two ends of which are respectively connected to the other end of the two cantilever rods, and when the cantilever rods are perpendicular to the cantilever main rods, the two cantilever main rods, the two cantilever rods and the nylon connecting rope form a rectangular structure;

[0014] A safety net, which is fixedly connected to the four periphery of the two cantilever main rods, the two cantilever rods and the nylon connecting rope.

[0015] Preferably, a pushing handle is fixedly installed on the two side rods, and the pushing handle has an inverted U-shaped structure, one end of which is fixedly connected to the top surface of the side rod, and the other end of which is fixedly connected to the top surface of the wall outer fixing arm.

[0016] Preferably, a T-shaped handle is fixedly installed at one end of the first screw rod and the second screw rod.

[0017] Preferably, two locking screw rods are fixedly installed on the front cross rod, and the two locking screw rods are respectively located on the left and right sides of the two rotating support seats, and the two cantilever main rods are provided with slot holes, and the two slot holes correspond to the two locking screw rods, and when the two cantilever main rods are parallel to the front cross rod, the locking screw rods are exposed through the slot holes.

[0018] Preferably, a short right-angle rod is vertically installed on the top surface of the first end of the cantilever main rod, and when the cantilever main rod is parallel to the front cross rod, the short right-angle rod is upwardly arranged, and when the cantilever main rod is perpendicular to the front cross rod, the short right-angle rod is placed flat on the front cross rod.

[0019] Preferably, a retracting device is fixedly installed on the front cross rod, and the retracting device comprises

[0020] A support vertical rod is fixedly installed on the front cross rod and located between the two rotating support seats;

[0021] A wheel bottom plate is fixedly installed on the top of the support vertical rod;

[0022] Four wheel supports are fixedly installed on the wheel bottom plate, two of which are a group and are arranged in front and back;

[0023] A first wheel shaft is rotatably installed on the group of wheel supports;

[0024] A second wheel shaft is rotatably installed on the other group of wheel supports;

[0025] A first rope wheel is sleeved and fixed on the first wheel shaft;

[0026] The second rope wheel is sleeved and fixed on the second wheel shaft, and the first rope wheel and the second rope wheel both comprise a middle hollow pipe, one end of the middle hollow pipe is provided with a circular steel plate, and the other end is provided with a circular gear, and the circular gears of the first rope wheel and the second rope wheel are engaged with each other.

[0027] The first rope is fixedly connected with the middle hollow pipe of the first rope wheel at one end and is fixedly connected with one of the cantilever main rods at the other end.

[0028] The second rope is fixedly connected with the middle hollow pipe of the second rope wheel at one end and is fixedly connected with the other cantilever main rod at the other end.

[0029] Preferably, the second wheel shaft has an exposed section outside the wheel support, the exposed section has a hexagonal cross section, the exposed section cooperates with a control handle, and the control handle has a Z-shaped structure and is provided with an inner hexagonal circular hole at one end.

[0030] Preferably, the circular gear of the first rope wheel is provided below with a brake device, and the brake device comprises

[0031] The brake housing is fixedly installed on the wheel bottom plate and is provided with a hole at the top and the bottom.

[0032] The brake steel tooth is arranged in the brake housing and is exposed from the hole at the top of the brake housing, the top of the brake steel tooth is a trapezoid, and the trapezoid corresponds to the groove of the circular gear of the first rope wheel.

[0033] The circular rod is fixedly connected with the bottom of the brake steel tooth at one end and is exposed from the hole at the bottom of the brake housing at the other end.

[0034] The spring is arranged in the brake housing, is sleeved on the upper part of the circular rod, supports the bottom of the brake steel tooth at one end, and supports the top of the wheel bottom plate at the other end.

[0035] The pull ring is fixedly connected with the bottom of the circular rod.

[0036] Preferably, the support stand is provided with a falling alarm device, and the falling alarm device comprises a battery box fixedly installed on the support stand.

[0037] The trigger box is fixedly installed on the left side of the battery box, the trigger box is provided with a terminal on the right side, the terminal is connected with the negative electrode of the battery box through a lead wire, and the trigger box is provided with a spring metal sheet on the left side, and one end of the spring metal sheet is connected with the terminal.

[0038] An alarm box is connected with the positive pole of the battery box and the other end of the spring metal sheet through a lead wire, and the battery box, the trigger box and the alarm box form a circuit loop.

[0039] A plastic sheet is arranged between the spring metal sheet and the terminal for cutting off the circuit loop.

[0040] An alarm pull rope is fixedly connected with the middle part of the safety net at one end and fixedly connected with the plastic sheet at the other end, and the plastic sheet is pulled off through the alarm pull rope to close the circuit loop.

[0041] The use method of the safety net suspension device in the elevator shaft according to any one of the above, comprising the following steps:

[0042] S1: Assemble several sets of safety net suspension devices, and after assembly, rotate the two cantilever rods to be parallel to the cantilever main rods, rotate the two cantilever main rods to be perpendicular to the front cross rod, and the complete net is in a completely retracted state;

[0043] S2: Move the safety net suspension device to the corresponding height of the floor elevator door opening where the safety net needs to be arranged, rotate the two cantilever main rods to be perpendicular to the cantilever main rods, and the safety net is in a half-expanded state;

[0044] S3: Push the safety net suspension device into the elevator door opening and position it, and then rotate the two cantilever main rods to be parallel to the front cross rod, and the safety net is in a completely expanded state;

[0045] S4: Rotate and screw the two first screws to tightly press against the outer wall of the elevator shaft, force the cantilever main rod to tightly press against the inner wall of the elevator shaft, so that the elevator shaft wall is tightly clamped by the first screw and the cantilever main rod, and the safety net suspension device cannot move forward and backward;

[0046] S5: Rotate and screw the two second screws to tightly press against the inner wall of the door opening of the elevator shaft, and the safety net suspension device cannot move left and right, and the safety net suspension is completed, and the construction engineering can be carried out;

[0047] S6: After the construction engineering is completed, the safety net suspension device is gradually retracted and removed from the elevator shaft door opening.

[0048] The present application provides a safety net suspension device in an elevator shaft and a use method thereof, which has the following beneficial effects.

[0049] 1. The safety net suspension device is moved into the elevator shaft door opening to completely expand the safety net, and the safety net suspension device can be fixed by the first screw and the second screw, and after the construction engineering is completed, the safety net suspension device is removed to remove the safety net, the safety net setting operation is simple, and manual entry into the elevator shaft is not required, which greatly reduces the safety hazards of safety net installation and removal.

[0050] 2. The first rope pulley and the second rope pulley mesh with each other. When rotating, the two cantilever main poles can be raised or lowered synchronously through the first rope and the second rope, thereby quickly controlling the raising and lowering state of the safety net.

[0051] 3. When a heavy object falls onto the safety net, the alarm rope is pulled down, the plastic sheet separates from the spring metal plate and the terminal block, the circuit is closed, the alarm box sounds an alarm, and the management personnel can arrive at the scene in time to deal with the dangerous incident. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the elevator shaft structure of the present invention;

[0053] Figure 2 This is a schematic diagram of the complete net suspension structure of the present invention;

[0054] Figure 3 This is a schematic diagram of the chassis structure of the present invention;

[0055] Figure 4 For the present invention Figure 3 Schematic diagram of the structure in the AA direction;

[0056] Figure 5 For the present invention Figure 3 Schematic diagram of the structure in the middle BB direction;

[0057] Figure 6 This is a schematic diagram of the overall structure of the safety net suspension device of the present invention;

[0058] Figure 7 This is a schematic diagram of the cantilever main rod of the present invention;

[0059] Figure 8 This is a schematic diagram of the structure of the present invention when the cantilever rod is parallel and perpendicular to the cantilever main rod;

[0060] Figure 9 This is a schematic diagram of the working structure of the receiving and releasing device of the present invention;

[0061] Figure 10 This is an internal front view of the receiving and releasing device of the present invention;

[0062] Figure 11 This is an internal side view of the receiving and releasing device of the present invention;

[0063] Figure 12 This is a schematic diagram of the control handle of the present invention;

[0064] Figure 13 This is a schematic diagram of the braking device of the present invention;

[0065] Figure 14The external front view of the retractable device of the present application;

[0066] Figure 15 The working schematic diagram of the falling alarm device of the present application;

[0067] Figure 16 The internal structure schematic diagram of the falling alarm device of the present application.

[0068] In the figure: 1, base plate; 101, front crossbar; 102, rear crossbar; 103, side bar; 104, moving wheel; 2, wall outside fixed arm; 3, screw support seat; 4, rotating support seat; 5, cantilever main rod; 51, short right-angle rod; 6, overhanging rod; 7, nylon connecting rope; 8, safety net; 9, first screw; 10, second screw; 11, pushing handle; 12, T-shaped handle; 13, locking screw; 14, slot hole; 15, retractable device; 1501, support vertical rod; 1502, wheel bottom plate; 1503, wheel support seat; 1504, first wheel shaft; 1505, second wheel shaft; 15051, exposed section; 1506, first rope wheel; 1507, second rope wheel; 1508, first rope; 1509, second rope; 1510, middle hollow pipe; 1511, circular steel plate; 1512, circular gear; 16, control handle; 17, brake device; 1701, brake shell; 1702, brake steel tooth; 1703, round rod; 1704, spring; 1705, pull ring; 18, falling alarm device; 1801, battery box; 1802, trigger box; 18021, terminal; 18022, spring metal sheet; 1803, alarm box; 1804, plastic sheet; 1805, alarm pull rope; 19, protective shell; 100, elevator shaft. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely below in combination with the drawings of the present application.

[0070] The technical scheme of the present application will be described clearly and completely below in combination with the embodiments, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person of ordinary skill in the art without making creative labor, belong to the protection scope of the present application.

[0071] In the description of the application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0072] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0073] Embodiments, such as Figures 1-16As shown, a safety net suspension device in an elevator shaft includes a chassis 1, two wall outside fixed arms 2, two screw rod support seats 3, two rotating support seats 4, two cantilever main rods 5, two cantilever rods 6, a nylon connecting rope 7 and a safety net 8. The chassis 1 is fixedly connected by a front cross rod 101, a rear cross rod 102 and two side rods 103, and has a rectangular structure. A moving wheel 104 is fixedly installed at the bottom of the chassis 1, and the safety net suspension device is convenient to move. One end of each of the two wall outside fixed arms 2 is fixedly connected with the two side rods 103, and the other end thereof is cantilevered outward to the left and right sides of the two side rods 103. A first screw rod 9 is threadedly connected with one end of each of the two wall outside fixed arms 2, and the first screw rod 9 is used to abut against the outer wall of the elevator shaft 100. Specifically, the one end of each of the two wall outside fixed arms 2 is provided with a circular hole and an internally threaded sleeve pipe is arranged in the circular hole. The first screw rod 9 can be manually screwed into the internally threaded sleeve pipe. The two screw rod support seats 3 are symmetrically fixedly installed on the two side rods 103 and located in front of the wall outside fixed arms 2. Second screw rods 10 are threadedly connected with the two screw rod support seats 3, and the second screw rods 10 are used to abut against the inner side wall of the door opening of the elevator shaft 100. Specifically, the screw rod support seat 3 is a thick steel plate, and the thick steel plate is provided with a circular hole and an internal thread. The second screw rod 10 can be manually screwed into the internally threaded sleeve pipe. The two rotating support seats 4 are fixedly installed on the front cross rod 101. The two cantilever main rods 5 have first ends and second ends, and the first ends are rotatably connected with the two rotating support seats 4. The cantilever main rods 5 can be rotated to be perpendicular to or parallel to the front cross rod 101. When the cantilever main rods 5 are parallel to the front cross rod 101, the second ends of the cantilever main rods 5 are cantilevered outward to the left and right sides of the front cross rod 101. The two cantilever main rods 5 are used to abut against the inner wall of the elevator shaft 100. Specifically, the rotating support seat 4 is composed of two parallel steel plates, and the two parallel steel plates are welded on the front cross rod 101. A circular hole is arranged in the middle of the steel plate for installing a rotating shaft, and the cantilever main rod 5 is installed through the rotating shaft. One end of each of the two cantilever rods 6 is rotatably connected with the front side of the second end of each of the two cantilever main rods 5. The cantilever rod 6 can be rotated to be perpendicular to or parallel to the cantilever main rod 5. The two ends of the nylon connecting rope 7 are connected with the other ends of the two cantilever rods 6, respectively. When the cantilever rod 6 is perpendicular to the cantilever main rod 5, the two cantilever main rods 5, the two cantilever rods 6 and the nylon connecting rope 7 form a rectangular structure. The safety net 8 is fixedly connected with the periphery of the two cantilever main rods 5, the two cantilever rods 6 and the nylon connecting rope 7. Specifically, a plurality of steel rings are welded on the upper surfaces of the cantilever main rods 5 and the cantilever rods 6 at an interval of 30 cm. The safety net 8 is tightly bound on the rings at the rear and both sides thereof, and the front end of the safety net 8 is tightly bound with the nylon connecting rope 7. The installed safety net 8 has a natural downwardly hanging circular bottom shape.

[0074] The application further provides a use method of the safety net suspension device in the elevator shaft.

[0075] S1: Assemble several sets of safety net suspension devices, after assembly, two cantilever rods 6 are rotated to be parallel to the cantilever main rods 5, two cantilever main rods 5 are rotated to be perpendicular to the front cross rod 101, and the complete net is in a completely retracted state, so that the overall volume is reduced and storage is facilitated;

[0076] S2: The safety net suspension device is moved to the corresponding height of the floor elevator shaft 100 door opening where the safety net 8 needs to be set, two cantilever main rods 5 are rotated to be perpendicular to the cantilever main rods 5, and the safety net 8 is in a half-expanded state;

[0077] S3: The safety net suspension device is pushed into the elevator shaft 100 door opening and positioned, and then two cantilever main rods 5 are rotated to be parallel to the front cross rod 101, and the safety net 8 is in a fully expanded state;

[0078] S4: Rotate and screw two first screws 9 to tightly press the outer wall of the elevator shaft 100, force the cantilever main rod 5 to tightly press the inner wall of the elevator shaft 100, so that the first screw 9 and the cantilever main rod 5 tightly clamp the wall of the elevator shaft 100, and the safety net suspension device cannot move forward and backward;

[0079] S5: Rotate and screw two second screws 10 to tightly press the inner wall of the door opening of the elevator shaft 100, so that the safety net suspension device cannot move left and right, and the safety net 8 is hung, and construction of the building project can be carried out;

[0080] S6: After the construction of the building project is completed, the safety net suspension device is gradually retracted and removed from the door opening of the elevator shaft 100.

[0081] The safety net suspension device is moved into the door opening of the elevator shaft 100, and the safety net 8 is fully expanded to quickly set the safety net 8, and the first screw 9 and the second screw 10 can fix the safety net suspension device, and after the construction of the building project is completed, the safety net suspension device is removed, and the safety net 8 is removed, the safety net 8 is set, the operation is simple, and manual entry into the elevator shaft 100 is not required, which greatly reduces the safety hazards of installation and removal of the safety net 8.

[0082] In one specific embodiment, two said side rods 103 are fixedly installed with a push handle 11, the push handle 11 is in inverted U-shaped structure, one end is fixedly connected with the top surface of the side rod 103, and the other end is fixedly connected with the top surface of the wall outer fixed arm 2, and the push handle 11 facilitates pushing and moving the safety net suspension device.

[0083] In one specific embodiment, one end of the first screw 9 and the second screw 10 is fixedly installed with a T-shaped handle 12, and the T-shaped handle 12 facilitates rotating and screwing the first screw 9 and the second screw 10.

[0084] In one specific embodiment, two locking screws 13 are fixedly installed on the front cross bar 101, and are respectively located on the left and right sides of the two rotating support seats 4. Two slot holes 14 are arranged on the two cantilever main bars 5, and correspond to the two locking screws 13. When the two cantilever main bars 5 are parallel to the front cross bar 101, the locking screws 13 are exposed through the slot holes 14. By sleeving a washer on the exposed end of the locking screw 13 and screwing a hexagonal nut, the cantilever main bars 5 can be locked on the front cross bar 101, preventing the cantilever main bars 5 from rotating up and down.

[0085] In one specific embodiment, a short right-angle bar 51 is vertically installed on the top surface of the first end of the cantilever main bar 5. When the cantilever main bar 5 is parallel to the front cross bar 101, the short right-angle bar 51 is arranged upward. When the cantilever main bar 5 is perpendicular to the front cross bar 101, the short right-angle bar 51 is arranged flat on the front cross bar 101. In this way, the cantilever main bar 5 can be prevented from continuing to rotate when it is perpendicular to the front cross bar 101, and the cantilever main bar 5 can be kept in a stable state.

[0086] In one specific embodiment, a retractable device 15 is fixedly installed on the front cross bar 101. The retractable device 15 includes a support vertical bar 1501, a wheel bottom plate 1502, four wheel supports 1503, a first wheel shaft 1504, a second wheel shaft 1505, a first rope wheel 1506, a second rope wheel 1507, a first rope 1508, and a second rope 1509. The support vertical bar 1501 is fixedly installed on the front cross bar 101 and located between the two rotating support seats 4. The wheel bottom plate 1502 is fixedly installed on the top of the support vertical bar 1501. The four wheel supports 1503 are fixedly installed on the wheel bottom plate 1502, and two of them are arranged in front of and behind the other two. The first wheel shaft 1504 is rotatably installed on a group of the wheel supports 1503. The second wheel shaft 1505 is rotatably installed on another group of the wheel supports 1503. The first rope wheel 1506 is sleeved and fixed on the first wheel shaft 1504. The second rope wheel 1507 is sleeved and fixed on the second wheel shaft 1505. The first rope wheel 1506 and the second rope wheel 1507 each include a middle hollow tube 1510, one end of which is provided with a circular steel plate 1511, and the other end is provided with a circular gear 1512. The circular gears 1512 of the first rope wheel 1506 and the second rope wheel 1507 are meshed with each other. One end of the first rope 1508 is fixedly connected with the middle hollow tube 1510 of the first rope wheel 1506, and the other end is fixedly connected with one of the cantilever main bars 5. One end of the second rope 1509 is fixedly connected with the middle hollow tube 1510 of the second rope wheel 1507, and the other end is fixedly connected with the other cantilever main bar 5.

[0087] The first rope wheel 1506 and the second rope wheel 1507 are engaged with each other, and when rotating, the two cantilever main rods 5 can be synchronously retracted or lowered through the first rope 1508 and the second rope 1509, so as to quickly control the retracting and opening state of the safety net 8.

[0088] In a specific embodiment, the second axle 1505 has an exposed section 15051 outside the wheel support 1503, the exposed section 15051 is hexagonal in cross section, and the exposed section 15051 is matched with the control handle 16. The control handle 16 is Z-shaped, and an inner hexagonal hole is formed at one end. The end of the control handle 16 with the inner hexagonal hole is inserted into the exposed section 15051 and engaged with each other. By shaking the control handle 16, the rotation of the second axle 1505 can be controlled, so as to control the rotation of the second rope wheel 1507 and the first rope wheel 1506.

[0089] In a specific embodiment, the wheel bottom plate 1502 is provided with a protective shell 19, which is inverted U-shaped and fixedly connected to the front and rear sides of the wheel bottom plate 1502. The protective shell 19 can cover the upper part and the front and rear panels of the retracting and releasing device 15, and has the effect of safety protection during operation.

[0090] In a specific embodiment, the first rope wheel 1506 is provided with a brake device 17 below the circular gear 1512. The brake device 17 includes a brake shell 1701, brake steel teeth 1702, a circular rod 1703, a spring 1704, and a pull ring 1705. The brake shell 1701 is fixedly installed on the wheel bottom plate 1502, and holes are formed at the top and bottom. The brake steel teeth 1702 are arranged in the brake shell 1701, and the upper part is exposed from the hole at the top of the brake shell 1701. The top of the brake steel teeth 1702 is trapezoidal, corresponding to the groove of the circular gear 1512 of the first rope wheel 1506. One end of the circular rod 1703 is fixedly connected to the bottom of the brake steel teeth 1702, and the other end is exposed from the hole at the bottom of the brake shell 1701. The spring 1704 is located in the brake shell 1701, and is sleeved on the upper part of the circular rod 1703. One end supports the bottom of the brake steel teeth 1702, and the other end supports the top of the wheel bottom plate 1502. The pull ring 1705 is fixedly connected to the bottom of the circular rod 1703.

[0091] When the pull ring 1705 is pulled, the brake steel tooth 1702 moves down as a whole, the top trapezoid is disengaged from the groove of the circular gear 1512 of the first rope wheel 1506, the first rope wheel 1506 and the second rope wheel 1507 can rotate freely, and vice versa. When the pull ring 1705 is released, the spring 1704 pushes the brake steel tooth 1702 to move up as a whole, the top trapezoid is engaged with the groove of the circular gear 1512 of the first rope wheel 1506, and the first rope wheel 1506 and the second rope 1509 wheel 1507 are limited to rotate freely.

[0092] In a specific embodiment, the support vertical rod 1501 is provided with a falling alarm device 18, the falling alarm device 18 includes a battery box 1801, a trigger box 1802, an alarm box 1803, a plastic sheet 1804 and an alarm pull rope 1805, the battery box 1801 is fixedly installed on the support vertical rod 1501; the trigger box 1802 is fixedly installed on the left side of the battery box 1801, a wiring terminal 18021 is arranged on the right side in the trigger box 1802, the wiring terminal 18021 is connected with the negative electrode of the battery box 1801 through a lead wire, a spring metal sheet 18022 is arranged on the left side in the trigger box 1802, one end of the spring metal sheet 18022 is connected with the wiring terminal 18021; the alarm box 1803 is connected with the positive electrode of the battery box 1801 and the other end of the spring metal sheet 18022 through lead wires respectively, the battery box 1801, the trigger box 1802 and the alarm box 1803 form a circuit loop; the plastic sheet 1804 is clamped between the spring metal sheet 18022 and the wiring terminal 18021, for cutting off the circuit loop; one end of the alarm pull rope 1805 is fixedly connected with the middle part of the safety net 8, and the other end is fixedly connected with the plastic sheet 1804, the plastic sheet 1804 is pulled away by the alarm pull rope 1805 to close the circuit loop.

[0093] When a heavy object falls on the safety net 8, the alarm pull rope 1805 is pulled down, the plastic sheet 1804 is separated from the spring metal sheet 18022 and the wiring terminal 18021, the circuit loop is closed, and the alarm box 1803 alarms accordingly. Specifically, the alarm box 1803 is a wireless transmission product, which is installed in a position where the electric signal is not easy to be blocked. When the circuit loop is closed, the alarm box 1803 sends a wireless electric signal, and a wireless electric receiving device in a remote office immediately sends an alarm signal, so that the management personnel can timely arrive at the scene to deal with the dangerous event.

[0094] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A safety net suspension device for elevator shafts, characterized in that: The chassis consists of a front crossbar, a rear crossbar, and two side bars, which are fixedly connected together. It has a rectangular structure and is equipped with casters at the bottom. Two wall-mounted arms are fixed at one end to the two side rods, and the other end extends outward to the left and right sides of the two side rods. The outward end is threaded with a first screw rod, which is used to hold the elevator shaft against the outer wall. Two screw support seats are symmetrically fixedly installed on the two side rods and located in front of the wall fixing arm. The two screw support seats are threaded with a second screw, which is used to hold the inner side wall of the door opening of the elevator shaft. Two rotating support seats are symmetrically and fixedly installed on the front crossbar; Two cantilever main rods have a first end and a second end. The first end is rotatably connected to the two rotating support seats. The cantilever main rods can be rotated to be perpendicular or parallel to the front crossbar. When parallel, the second end of the cantilever main rod extends outward to the left and right sides of the front crossbar. The two cantilever main rods are used to support the inner wall of the elevator shaft. Two cantilever rods are rotatably connected at one end to the front side of the second end of the two cantilever main rods, and the cantilever rods can be rotated to be perpendicular or parallel to the cantilever main rods; The nylon connecting rope is connected at both ends to the other ends of the two cantilever rods respectively. When the cantilever rods are perpendicular to the cantilever main rods, the two cantilever main rods, the two cantilever rods and the nylon connecting ropes form a rectangular structure. The safety net is fixedly connected to the two cantilever main poles, the two cantilever poles, and the nylon connecting ropes on all four sides. A fall alarm device is installed on the support pole, and the fall alarm device includes a battery box, which is fixedly installed on the support pole; A trigger box is fixedly installed on the left side of the battery box. A wiring terminal is provided on the right side inside the trigger box. The wiring terminal is connected to the negative terminal of the battery box through a lead wire. A spring metal piece is provided on the left side inside the trigger box. One end of the spring metal piece is connected to the wiring terminal. The alarm box is connected to the positive terminal of the battery box and the other end of the spring metal sheet via lead wires, and the battery box, trigger box, and alarm box form a circuit loop; A plastic sheet is positioned between the spring metal sheet and the terminal block to cut off the circuit loop; An alarm pull cord is fixedly connected at one end to the middle of the safety net and at the other end to the plastic sheet. The circuit is closed by pulling the plastic sheet off the plastic sheet using the alarm pull cord.

2. The safety net suspension device in an elevator shaft according to claim 1, characterized in that: A push handle is fixedly installed on the two side rods. The push handle has an inverted U-shaped structure, with one end fixedly connected to the top surface of the side rod and the other end fixedly connected to the top surface of the wall-mounted arm.

3. The safety net suspension device in an elevator shaft according to claim 1, characterized in that: A T-shaped handle is fixedly installed at one end of the first screw and the second screw.

4. The safety net suspension device in an elevator shaft according to claim 1, characterized in that: Two locking screws are fixedly installed on the front crossbar. The two locking screws are located on the left and right sides of the two rotating support seats respectively. The two cantilever main rods are provided with slots, and the two slots correspond to the two locking screws. When the two cantilever main rods are parallel to the front crossbar, the locking screws are exposed through the slots.

5. The safety net suspension device in an elevator shaft according to claim 1, characterized in that: A short right-angle rod is vertically installed on the top surface of the first end of the cantilever main rod. When the cantilever main rod is parallel to the front crossbar, the short right-angle rod is set upward. When the cantilever main rod is perpendicular to the front crossbar, the short right-angle rod is laid flat on the front crossbar.

6. The safety net suspension device in an elevator shaft according to claim 1, characterized in that: A retraction device is fixedly installed on the front crossbar. The retraction device includes a support column, which is fixedly installed on the front crossbar and located between the two rotating support seats; and a wheel base plate, which is fixedly installed on the top of the support column. Four wheel supports are fixedly installed on the wheel base plate, in pairs, arranged front and rear; The first wheel axle is rotatably mounted on a set of wheel supports; The second wheel axle is rotatably mounted on another set of wheel supports; The first rope pulley is fitted and fixed on the first pulley axle; The second rope pulley is sleeved and fixed on the second wheel shaft. Both the first rope pulley and the second rope pulley include a hollow tube in the middle. One end of the hollow tube is provided with a circular steel plate, and the other end is provided with a circular gear. The circular gears of the first rope pulley and the second rope pulley mesh with each other. The first rope has one end fixedly connected to the central hollow tube of the first rope pulley, and the other end fixedly connected to one of the cantilever main rods; The second rope has one end fixedly connected to the central hollow tube of the second rope reel, and the other end fixedly connected to another cantilever main rod.

7. A safety net suspension device for elevator shafts according to claim 6, characterized in that: The second axle has an exposed section outside the wheel support. The exposed section has a hexagonal cross-section and cooperates with the control handle. The control handle has a Z-shaped structure and an inner hexagonal hole at one end.

8. A safety net suspension device for elevator shafts according to claim 6, characterized in that: A braking device is provided below the circular gear of the first rope pulley, the braking device comprising: A brake housing is fixedly mounted on the wheel base plate, with holes at both the top and bottom; a brake tooth is disposed inside the brake housing, with its upper part protruding from the hole at the top of the brake housing, and the top of the brake tooth is trapezoidal, corresponding to the groove of the circular gear of the first rope wheel; A round rod, one end of which is fixedly connected to the bottom of the brake steel tooth, and the other end protruding from a hole at the bottom of the brake housing; A spring, located inside the brake housing, is sleeved on the upper part of the round rod, with one end supporting the bottom of the brake steel tooth and the other end supporting the top of the wheel base plate; A pull ring is fixedly connected to the bottom of the round rod.

9. A method of using a safety net suspension device in an elevator shaft according to any one of claims 1-8, characterized in that, Includes the following steps: S1: Assemble several sets of safety net suspension devices. After assembly, rotate the two cantilever rods to be parallel to the cantilever main rods and rotate the two cantilever main rods to be perpendicular to the front crossbars. The net is then in a fully retracted state. S2: Move the safety net suspension device to the elevator door opening of the floor at the corresponding height where the safety net needs to be installed, and rotate the two cantilever main rods to be perpendicular to the cantilever main rods, so that the safety net is in a semi-expanded state; S3: Push the safety net suspension device into the elevator door opening and position it, then rotate the two cantilever main rods until they are parallel to the front crossbar, so that the safety net is fully extended; S4: Rotate and twist the two first screws to press against the outer wall of the elevator shaft, forcing the cantilever main rod to press against the inner wall of the elevator shaft. Thus, the first screws and the cantilever main rod tightly clamp the elevator shaft wall, and the safety net suspension device cannot move back and forth. S5: Rotate and turn the two second screws to tighten them against the inner wall of the elevator shaft doorway. The safety net suspension device cannot move left or right. The safety net is now suspended and construction can begin. S6: After the construction is completed, the safety net suspension device can be gradually retracted and removed from the elevator shaft doorway.

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