A safety early warning method for a tower crane crossing an existing rail transit line

Abstract

The present application relates to tower crane engineering safety warning technical field, specifically relates to a kind of tower crane crossing existing rail transit line safety warning method, including the tower body fixedly installed on the outside of subway line, the top of the tower body is rotatably connected with rotary table, the top of the rotary table is fixedly installed with tower arm, the left side of the tower arm is fixedly installed with cab, the connecting place of the tower body and rotary table is respectively fixedly installed with first installation ring and second installation ring, the outside of the first installation ring is fixedly installed with two groups of buffer box, the outside of the second installation ring is fixedly installed with inductive plate at the position corresponding to buffer box, the inside of the buffer box is installed with buffer mechanism, the top of the cab is fixedly installed with sound-light alarm, the present application can timely remind driver to give warning, at the same time, enough reaction time is left for driver to operate, meet the requirement of civilized construction requirement requirement, while, the safety of tower crane construction is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tower crane engineering safety early warning, and particularly relates to a safety early warning method for a tower crane crossing an existing rail transit line. BACKGROUND

[0002] Tower cranes, also known as tower cranes, play an irreplaceable important role in the field of construction. China has its own tower cranes since the 1990s, but at that time the scale was very small, and generally a few tower cranes or a dozen tower cranes were operated at the same time. Tower crane drivers could avoid tower crane collision accidents by being cautious enough. With the rapid development of China's economy and the booming of the construction industry, the use of tower cranes has increased dramatically. China has developed into the world's largest tower crane country.

[0003] Currently, when a tower crane is close to a subway line during construction, the rotating radius of the tower crane tower arm will partially cover the subway due to the close distance between the tower crane and the subway. The civilized construction requires that the tower crane cannot cross above the subway. Currently, only the tower crane driver can control it himself. When operating the tower crane tower arm, its rotation range needs to be controlled. The driver's spirit needs to be concentrated during operation, and the technical requirements for the driver are also high. When the driver is tired or relaxed by playing a mobile phone, the tower crane will cross above the subway, and there is no timely warning. Not only will it be administratively punished for violating the civilized construction regulations, but it may also cause serious accidents and casualties.

[0004] Therefore, it is particularly important to design a safety early warning method for a tower crane crossing an existing rail transit line to solve the above-mentioned defects. SUMMARY

[0005] In view of the deficiencies in the prior art, the present application designs a safety early warning method for a tower crane crossing an existing rail transit line. The safety early warning method for the tower crane crossing the existing rail transit line aims to solve the technical problem that under the prior art, when a tower crane is under construction, the rotating radius of the tower arm cannot be timely warned to cover the subway, not only will it be administratively punished for violating the civilized construction regulations, but it may also cause serious accidents and casualties.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] The application discloses a tower crane crossing existing rail transit line safety early warning method, which comprises a tower body fixedly installed outside a subway line, a rotary table rotatably connected to the top of the tower body, a tower arm fixedly installed at the top of the rotary table, a cab fixedly installed at the left side of the tower arm, a first mounting ring and a second mounting ring fixedly installed at the connecting position of the tower body and the rotary table, two groups of buffer boxes fixedly installed at the outer side of the first mounting ring, inductive plates fixedly installed at the positions corresponding to the buffer boxes at the outer side of the second mounting ring, a buffer mechanism installed in the buffer box, and a sound and light alarm fixedly installed at the top of the cab.

[0008] As a preferred scheme of the application, a mounting plate is fixedly installed at the left end of the top of the cab, a hydraulic push rod is fixedly installed at the top of the mounting plate, a push plate is fixedly installed at the driving end of the hydraulic push rod, a connecting seat is fixedly installed at the right side of the mounting plate, a rotating shaft is rotatably connected in the connecting seat, a sunshade is fixedly installed at the right end of the rotating shaft, a driven gear is fixedly installed at the left end of the rotating shaft, and the top of the push plate is engaged with the driven gear through a plurality of gear slots.

[0009] As a preferred scheme of the application, the push plate is slidably connected with the mounting plate through a limiting groove, and the rotating shaft is rotatably connected with the connecting seat through a bearing.

[0010] As a preferred scheme of the application, the first mounting ring and the second mounting ring are both composed of a first half ring and a second half ring, connecting heads are fixedly connected to the two ends of the first half ring, locking heads are fixedly connected to the two ends of the second half ring, and rubber linings are fixedly connected to the inner sides of the first half ring and the second half ring.

[0011] As a preferred scheme of the application, locking columns are slidably connected to the two ends in the locking head, locking holes are formed in the connecting head at positions corresponding to the locking columns, operating handles are fixedly connected to the opposite ends of the two groups of locking columns, a first spring is movably installed in the locking head between the two groups of operating handles, and the two groups of operating handles are slidably connected with the locking head through a through slot.

[0012] As a preferred scheme of the application, two groups of position sensors are fixedly installed at the bottom of the first half ring, and inductive blocks are installed at positions corresponding to the position sensors at the bottom of the inductive plate, and the position sensors are electrically connected with the sound and light alarm.

[0013] As a preferred scheme of the application, a box cover is fixedly installed at the bottom of the buffer box, an installation groove is formed in the buffer box at a position corresponding to the box cover, and the box cover is fixedly connected with the buffer box through mounting screws at the four corners of the box cover.

[0014] As a preferred scheme of the present application, the inside of the buffer mechanism is slidably connected with a moving plate, one side of the moving plate is fixedly provided with a slide rod, both ends of the slide rod are slidably connected with a slide sleeve, the outside of the slide rod and on the side opposite to the two slide sleeves are both provided with a second spring, the outside of the two slide sleeves are both rotatably connected with a transmission rod, the two transmission rods are rotatably connected with a connecting plate, one end of the connecting plate on the outside of the buffer box is fixedly connected with a buffer plate, both ends of the other side of the moving plate are fixedly provided with a shock absorber.

[0015] As a preferred scheme of the present application, the left and right ends of the moving plate are slidably connected with the buffer box through a sliding groove, the outside of the slide rod is fixedly connected with a connecting sleeve, the outside of the connecting sleeve is fixedly connected with a rubber buffer pad, the outside of the buffer box is provided with a movable groove at a position corresponding to the buffer plate.

[0016] In order to solve the above technical problems, the specific operation steps are as follows:

[0017] S1, first install the tower body outside the subway line, then sleeve the first half ring and the second half ring outside the tower body and the rotating table;

[0018] S2, fix the connecting head and the locking head, and quickly install the first installation ring and the second installation ring outside the tower body and the rotating table, respectively;

[0019] S3, when the tower crane driver controls the rotating table to rotate, when the inductive plate on the second installation ring reaches the position of the buffer box, the inductive block contacts the position of the position sensor, and the audible and light alarm is triggered to give an audible and light alarm, thereby timely reminding the driver that the tower arm will cross above the subway line;

[0020] S4, after the inductive block on the inductive plate contacts the position of the position sensor, the driver cannot immediately control the rotating table to stop rotating after timely triggering the audible and light alarm, and the buffer mechanism is used to buffer the impact force of the inductive plate, thereby leaving enough reaction time for the driver to control the rotating table to stop rotating in time, avoiding the tower arm crossing above the subway line;

[0021] S5, the cab is provided with an adjustable sunshade, which can timely block the sunlight shining on the cab by adjusting the direction of the sunshade, thereby effectively preventing the light from affecting the sight line during construction, and avoiding the driver from being affected to operate the tower arm to cross above the subway line.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1. In this invention, through the coordinated design of the first mounting ring, the second mounting ring, the sensing plate, and the audible and visual alarm, when the tower body is installed outside the subway line for tower crane construction, the first mounting ring and the second mounting ring are first installed on the outside of the tower body and the turntable, respectively. When the tower crane operator controls the turntable to rotate, when the sensing plate on the second mounting ring reaches the position of the buffer box, the sensing block contacts the position sensor and triggers the audible and visual alarm, thereby promptly reminding the operator that the tower arm is about to cross over the subway line, playing a warning role and further improving the safety of tower crane construction.

[0024] 2. In this invention, through the coordinated design of the buffer box, the induction plate, and the buffer mechanism, after the induction block on the induction plate contacts the position sensor, the audible and visual alarm is triggered in time. However, the operator cannot immediately stop the turntable from rotating. At this time, the induction plate continues to move and contacts the buffer plate. The buffer plate pushes the connecting plate into the interior of the buffer box. Under the transmission of the transmission rod, the sliding sleeve slides on the outside of the sliding rod, which compresses the second spring. The second spring buffers the impact force of the induction plate. As the impact force increases and reaches the compression limit of the second spring, the moving plate is pushed inside the buffer box. The two sets of shock absorbers further buffer the first impact force, thus giving the operator sufficient reaction time to stop the turntable from rotating in time. This prevents the tower arm from crossing above the subway line, thereby meeting the requirements of civilized construction and ensuring the safety of tower crane construction. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure after the first mounting ring and the second mounting ring of the present invention are installed;

[0027] Figure 3 This is a schematic diagram of the structure at the connection between the tower body and the rotary table of the present invention;

[0028] Figure 4 This is a schematic diagram of the cab structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the first mounting ring and the second mounting ring of the present invention;

[0030] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0031] Figure 7 This is a schematic diagram of the internal structure of the buffer box of the present invention;

[0032] Figure 8 for Figure 7 Enlarged view at point B in the middle;

[0033] Figure 9 The schematic view of the locking head internal structure.

[0034] In the figure: 1, subway line; 2, tower body; 3, rotating table; 4, tower arm; 5, cab; 501, mounting plate; 502, hydraulic push rod; 503, push plate; 504, connecting seat; 505, rotating shaft; 506, sunshade; 507, driven gear; 508, gear slot; 509, limiting groove; 510, bearing; 6, first mounting ring; 601, first half ring; 602, second half ring; 603, connecting head; 604, locking head; 605, rubber lining; 606, locking column; 607, locking hole; 608, operating handle; 609, first spring; 610, slot; 611, position sensor; 612, induction block; 7, second mounting ring; 8, buffer box; 801, box cover; 802, mounting groove; 9, induction plate; 10, buffer mechanism; 1001, moving plate; 1002, sliding rod; 1003, sliding sleeve; 1004, second spring; 1005, transmission rod; 1006, connecting plate; 1007, buffer plate; 1008, shock absorber; 1009, sliding groove; 1010, connecting sleeve; 1011, rubber buffer; 1012, movable groove; 11, audible and visual alarm. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0036] Embodiment:

[0037] Please refer to Figures 1-9 The present application provides a technical solution:

[0038] A tower crane crossing existing rail transit line safety early warning method, including tower body 2 fixedly installed outside the subway line 1, the top of the tower body 2 is rotatably connected with the rotating table 3, the top of the rotating table 3 is fixedly installed with the tower arm 4, the left side of the tower arm 4 is fixedly installed with the cab 5, the connecting place of the tower body 2 and the rotating table 3 is fixedly installed with the first mounting ring 6 and the second mounting ring 7 respectively, the outer side of the first mounting ring 6 is fixedly installed with two sets of buffer boxes 8, the outer side of the second mounting ring 7 is fixedly installed with induction plates 9 at positions corresponding to the buffer boxes 8, the inside of the buffer box 8 is installed with the buffer mechanism 10, the top of the cab 5 is fixedly installed with the audible and visual alarm 11.

[0039] First, the left end of the top of the cab 5 is fixedly provided with a mounting plate 501, the top of the mounting plate 501 is fixedly provided with a hydraulic push rod 502, the driving end of the hydraulic push rod 502 is fixedly provided with a push plate 503, the right side of the mounting plate 501 is fixedly provided with a connecting seat 504, the inside of the connecting seat 504 is rotatably connected with a rotating shaft 505, the right end of the rotating shaft 505 is fixedly provided with a sunshade 506, the left end of the rotating shaft 505 is fixedly provided with a driven gear 507, the top of the push plate 503 is engaged with the driven gear 507 through a plurality of gear slots 508, the mounting plate 501 is fixedly installed on the top of the cab 5, the sunshade 506 is installed above the cab 5, the push plate 503 is pushed by the hydraulic push rod 502, the driven gear 507 is driven to rotate by the gear slot 508 in the push plate 503, so as to drive the rotating shaft 505 to rotate, thereby the angle of the sunshade 506 can be adjusted, the direction of the sunshade 506 is adjusted in time to block the sunlight towards the cab 5, which can effectively prevent the light from affecting the sight line during the construction process, and avoid the driver from being affected to operate the tower arm 4 to cross above the subway line 1.

[0040] Further, the push plate 503 is slidably connected with the mounting plate 501 through a limiting groove 509, and the rotating shaft 505 is rotatably connected with the connecting seat 504 through a bearing 510. When the push plate 503 is pushed, the limiting groove 509 limits the stroke of the push plate 503, and improves the movement stability of the push plate 503.

[0041] Then, the first mounting ring 6 and the second mounting ring 7 are both composed of a first half ring 601 and a second half ring 602, the two ends of the first half ring 601 are fixedly connected with connecting heads 603, the two ends of the second half ring 602 are fixedly connected with locking heads 604, the inner sides of the first half ring 601 and the second half ring 602 are fixedly connected with rubber linings 605, after the first half ring 601 and the second half ring 602 are sleeved on the outside of the tower body 2 and the slewing table 3, the connecting heads 603 are fixed by the locking heads 604, so as to install the first mounting ring 6 and the second mounting ring 7 on the outside of the tower body 2 and the slewing table 3 respectively, and since the rubber linings 605 are arranged, damage to the outside of the tower body 2 and the slewing table 3 after installation can be avoided.

[0042] Further, the locking head 604 is internally slidably connected with two locking columns 606, the connecting head 603 is internally provided with locking holes 607 corresponding to the locking columns 606, the opposite ends of the two groups of locking columns 606 are fixedly connected with operation handles 608, the first spring 609 is movably installed in the locking head 604 between the two groups of operation handles 608, when the first half ring 601 and the second half ring 602 are sleeved on the outside of the tower body 2 and the slewing platform 3, the two groups of operation handles 608 are pinched to make the two groups of locking columns 606 retract into the locking head 604, then the locking head 604 is clamped into the inside of the connecting head 603, and the operation handles 608 are released to clamp the locking columns 606 into the locking holes 607 under the rebound of the first spring 609, so that the connecting head 603 and the locking head 604 are fixed, and then the first mounting ring 6 and the second mounting ring 7 are conveniently and quickly mounted.

[0043] Wherein, the bottom of the first half ring 601 is fixedly installed with two groups of position sensors 611, the sensing plate 9 is installed with sensing blocks 612 at positions corresponding to the position sensors 611, and the position sensors 611 are electrically connected with the audible and visual alarm 11. After the first mounting ring 6 and the second mounting ring 7 are respectively installed on the outside of the tower body 2 and the slewing platform 3, the first half ring 601 of the first mounting ring 6 is installed with the position sensors 611. When the tower crane driver controls the slewing platform 3 to rotate, when the sensing plate 9 on the second mounting ring 7 reaches the position of the buffer tank 8, the sensing block 612 contacts the position sensor 611, triggering the audible and visual alarm 11 to give an audible and visual alarm, thereby timely reminding the driver that the tower arm 4 will cross above the subway line 1, playing a prompt warning role, and further improving the safety of tower crane construction.

[0044] Further, the bottom of the buffer tank 8 is fixedly installed with a tank cover 801, the bottom of the buffer tank 8 is provided with an installation groove 802 corresponding to the tank cover 801, and the four corners of the tank cover 801 are fixedly connected with the buffer tank 8 through mounting screws. The tank cover 801 on the outside of the buffer tank 8 is installed in the installation groove 802 through mounting screws, which can ensure the fixing effect of the tank cover 801 and can disassemble the tank cover 801, facilitating the maintenance and repair of the internal parts of the buffer tank 8.

[0045] Second, the inside sliding connection of the buffer mechanism 10 has a moving plate 1001, one side of the moving plate 1001 is fixedly installed with a slide rod 1002, both ends of the slide rod 1002 are slidingly connected with a slide sleeve 1003, the outer side of the slide rod 1002 and located on the side opposite to the two groups of slide sleeves 1003 are sleeved with a second spring 1004, the outer side of the two groups of slide sleeves 1003 are rotatably connected with a transmission rod 1005, the two groups of transmission rods 1005 are rotatably connected with a connecting plate 1006, one end of the connecting plate 1006 located on the outer side of the buffer box 8 is fixedly connected with a buffer plate 1007, both ends of the other side of the moving plate 1001 are fixedly installed with a shock absorber 1008, after the sensing block 612 on the sensing plate 9 contacts the position sensor 611, the sound and light alarm 11 is triggered in time, and the driver cannot immediately control the slewing table 3 to stop rotating, at this time, the sensing plate 9 will contact the buffer plate 1007 while continuing to move, the buffer plate 1007 pushes the connecting plate 1006 to retract into the inside of the buffer box 8, the slide sleeve 1003 is pushed to slide on the outer side of the slide rod 1002 under the transmission of the transmission rod 1005, so that the slide sleeve 1003 compresses the second spring 1004, the impact force of the sensing plate 9 is buffered by the second spring 1004, when the impact force increases to the compression limit of the second spring 1004, the moving plate 1001 is pushed into the inside of the buffer box 8, and the first impact force is further buffered by the two groups of shock absorbers 1008, so as to give the driver enough reaction time to control the slewing table 3 to stop rotating in time, avoid the tower arm 4 to cross above the subway line 1, and thus meet the requirements of civilized construction, and ensure the safety of tower crane construction.

[0046] Finally, both ends of the moving plate 1001 are slidingly connected with the buffer box 8 through a sliding groove 1009, the outer side of the slide rod 1002 is fixedly connected with a connecting sleeve 1010, the outer side of the connecting sleeve 1010 is fixedly connected with a rubber buffer pad 1011, the position corresponding to the buffer plate 1007 on the outer side of the buffer box 8 is provided with a movable groove 1012, the moving plate 1001 slides in the inside of the buffer box 8 through the sliding groove 1009, so as to ensure the stability of movement, at the same time, when the connecting plate 1006 is locked in the inside of the buffer box 8, the slide rod 1002 is protected by the rubber buffer pad 1011 on the outer side of the connecting sleeve 1010, so as to avoid damage to the slide rod 1002 when the connecting plate 1006 reaches the compression limit, when the sensing plate 9 pushes the buffer plate 1007, the buffer plate 1007 will enter the inside of the movable groove 1012 after reaching the compression limit.

[0047] In the embodiment, the specific implementation scenario is as follows: when the tower body 2 is installed outside the subway line 1 for tower crane construction, the first half ring 601 and the second half ring 602 are sleeved outside the tower body 2 and the slewing table 3, the two groups of locking columns 606 are retracted into the inside of the locking head 604 by pinching the two groups of operation handles 608, then the locking head 604 is clamped into the inside of the connecting head 603, and the operation handles 608 are released, so that the locking column 606 is clamped into the inside of the locking hole 607 under the rebound of the first spring 609, thereby fixing the connecting head 603 and the locking head 604, and then the first installation ring 6 and the second installation ring 7 are respectively installed outside the tower body 2 and the slewing table 3; when the tower crane driver controls the slewing table 3 to rotate, when the induction plate 9 on the second installation ring 7 reaches the position of the buffer box 8, the induction block 612 contacts the position of the position sensor 611, and the sound and light alarm 11 is triggered to sound and light alarm, thereby timely reminding the driver that the tower arm 4 will cross above the subway line 1, and playing a prompt warning role; after the induction block 612 on the induction plate 9 contacts the position of the position sensor 611, and the sound and light alarm 11 is triggered in time, the driver cannot immediately control the slewing table 3 to stop rotating, at this time, the induction plate 9 continues to move and contacts the buffer plate 1007, the buffer plate 1007 pushes the connecting plate 1006 to retract into the inside of the buffer box 8, the connecting plate 1006 pushes the sliding sleeve 1003 to slide outside the sliding rod 1002 under the transmission of the transmission rod 1005, so that the sliding sleeve 1003 compresses the second spring 1004, the second spring 1004 is used to buffer the impact force of the induction plate 9, when the impact force increases to the pressure limit of the second spring 1004, the moving plate 1001 is pushed in the inside of the buffer box 8, and the two groups of shock absorbers 1008 are used to further buffer the first impact force, so as to give the driver enough reaction time to control the slewing table 3 to stop rotating in time, thereby avoiding the tower arm 4 from crossing above the subway line 1; meanwhile, when the driver is located in the cab 5 to operate, the adjustable sunshade 506 is installed above the cab 5, the direction of the sunshade 506 is adjusted, the sunlight is blocked in time, the light can be effectively prevented from affecting the sight during construction, the whole operation process is simple and convenient, the driver can be timely reminded and warned by the design, and the driver has enough reaction time to operate, the requirements of civilized construction are met, and the safety of tower crane construction is ensured.

[0048] The specific operation steps of the embodiment of the application are as follows:

[0049] S1, first install the tower body 2 outside the subway line 1, and then sleeve the first half ring 601 and the second half ring 602 outside the tower body 2 and the slewing table 3;

[0050] S2, the connection head 603 and the locking head 604 are fixed, and the first mounting ring 6 and the second mounting ring 7 are quickly mounted outside the tower body 2 and the rotating table 3 respectively;

[0051] S3, when the tower crane driver controls the rotating table 3 to rotate, when the inductive plate 9 on the second mounting ring 7 reaches the position of the buffer box 8, the inductive block 612 contacts the position of the position sensor 611, and the audible and light alarm 11 is triggered to give an audible and light alarm, thereby timely reminding the driver that the tower arm 4 will cross above the subway line 1;

[0052] S4, after the inductive block 612 on the inductive plate 9 contacts the position of the position sensor 611, the audible and light alarm 11 is triggered in time, and the driver cannot immediately control the rotating table 3 to stop rotating. The buffer mechanism 10 is used to buffer the impact force of the inductive plate 9, so as to give the driver enough reaction time, so that the rotating table 3 can be controlled to stop rotating in time, and the tower arm 4 is prevented from crossing above the subway line 1;

[0053] S5, the adjustable sunshade 506 is installed above the cab 5, the direction of the sunshade 506 is adjusted, the sunlight shining on the cab 5 is blocked in time, the light can be effectively prevented from affecting the sight line during construction, and the driver is prevented from being affected to operate the tower arm 4 to cross above the subway line 1.

[0054] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A safety early warning device for tower cranes crossing existing rail transit lines, comprising a tower body (2) fixedly installed on the outside of a subway line (1), characterized in that, The top of the tower body (2) is rotatably connected to a turntable (3), and a tower arm (4) is fixedly installed on the top of the turntable (3). A driver's cab (5) is fixedly installed on the left side of the tower arm (4). A first mounting ring (6) and a second mounting ring (7) are fixedly installed at the connection between the tower body (2) and the turntable (3). Two sets of buffer boxes (8) are fixedly installed on the outside of the first mounting ring (6). A sensor plate (9) is fixedly installed on the outside of the second mounting ring (7) at a position corresponding to the buffer box (8). A buffer mechanism (10) is installed inside the buffer box (8). An audible and visual alarm (11) is fixedly installed on the top of the driver's cab (5). The first mounting ring (6) and the second mounting ring (7) are both composed of a first half ring (601) and a second half ring (602). Both ends of the first half ring (601) are fixedly connected to a connector (603), and both ends of the second half ring (602) are fixedly connected to a locking head (604). Both the inner sides of the first half ring (601) and the second half ring (602) are fixedly connected to a rubber liner (605). Two sets of position sensors (611) are fixedly installed at the bottom of the first half ring (601). A sensing block (612) is installed at the bottom of the sensing plate (9) at a position corresponding to the position sensor (611). The position sensor (611) is electrically connected to the audible and visual alarm (11). The buffer mechanism (10) is internally slidably connected to a movable plate (1001). A slide rod (1002) is fixedly installed on one side of the movable plate (1001). Both ends of the slide rod (1002) are slidably connected to a sliding sleeve (1003). A second spring (1004) is sleeved on the outer side of the slide rod (1002) and on the opposite side of the two sets of sliding sleeves (1003). A transmission rod (1005) is rotatably connected to the outer side of the two sets of transmission rods (1005). A connecting plate (1006) is rotatably connected between the two sets of transmission rods (1005). A buffer plate (1007) is fixedly connected to one end of the connecting plate (1006) located outside the buffer box (8). Shock absorbers (1008) are fixedly installed on both ends of the other side of the movable plate (1001).

2. The safety early warning device for tower cranes crossing existing rail transit lines according to claim 1, characterized in that, A mounting plate (501) is fixedly installed on the left end of the top of the cab (5). A hydraulic push rod (502) is fixedly installed on the top of the mounting plate (501). A push plate (503) is fixedly installed on the drive end of the hydraulic push rod (502). A connecting seat (504) is fixedly installed on the right side of the mounting plate (501). A rotating shaft (505) is rotatably connected inside the connecting seat (504). A sunshade (506) is fixedly installed on the right end of the rotating shaft (505). A driven gear (507) is fixedly installed on the left end of the rotating shaft (505). The top of the push plate (503) meshes with the driven gear (507) through multiple sets of tooth grooves (508).

3. A safety early warning device for tower cranes crossing existing rail transit lines according to claim 2, characterized in that, The push plate (503) is slidably connected to the mounting plate (501) through the limiting groove (509), and the rotating shaft (505) is rotatably connected to the connecting seat (504) through the bearing (510).

4. A safety early warning device for tower cranes crossing existing rail transit lines according to claim 1, characterized in that, Locking pins (606) are slidably connected to both ends inside the locking head (604). Locking holes (607) are opened inside the connector (603) at positions corresponding to the locking pins (606). Operating handles (608) are fixedly connected to the opposite ends of the two sets of locking pins (606). A first spring (609) is movably installed inside the locking head (604) and between the two sets of operating handles (608). The interiors of the two sets of operating handles (608) are slidably connected to the locking head (604) through slots (610).

5. A safety early warning device for tower cranes crossing existing rail transit lines according to claim 1, characterized in that, The bottom of the buffer box (8) is fixedly installed with a box cover (801). The bottom of the buffer box (8) is provided with an installation groove (802) corresponding to the position of the box cover (801). The four corners of the box cover (801) are fixedly connected to the buffer box (8) by installation screws.

6. A safety early warning device for tower cranes crossing existing rail transit lines according to claim 1, characterized in that, Both ends of the movable plate (1001) are slidably connected to the buffer box (8) through the sliding groove (1009). A connecting sleeve (1010) is fixedly connected to the outside of the sliding rod (1002). A rubber buffer pad (1011) is fixedly connected to the outside of the connecting sleeve (1010). An movable groove (1012) is opened on the outside of the buffer box (8) at a position corresponding to the buffer plate (1007).

7. A safety early warning method for tower cranes crossing existing rail transit lines, characterized in that, The method of using a tower crane crossing an existing rail transit line as described in any one of claims 1-6 includes the following steps: S1. First, install the tower body (2) on the outside of the subway line (1), and then put the first half ring (601) and the second half ring (602) on the outside of the tower body (2) and the turntable (3); S2. Fix the connector (603) and the locking head (604) together, and quickly install the first mounting ring (6) and the second mounting ring (7) on the outside of the tower body (2) and the turntable (3) respectively; S3. When the tower crane operator controls the turntable (3) to rotate, when the sensor plate (9) on the second mounting ring (7) reaches the position of the buffer box (8), the sensor block (612) contacts the position sensor (611) and triggers the sound and light alarm (11) to provide a sound and light alarm, thereby timely reminding the operator that the tower arm (4) is about to cross the top of the subway line (1). S4. After the sensing block (612) on the sensing plate (9) contacts the position sensor (611), the driver cannot immediately control the turntable (3) to stop rotating after the sound and light alarm (11) is triggered in time. The buffer mechanism (10) is used to buffer the impact force of the sensing plate (9), so that the driver has enough reaction time to control the turntable (3) to stop rotating in time and avoid the tower arm (4) from crossing above the subway line (1). S5. An adjustable sunshade (506) is installed above the driver's cab (5). By adjusting the direction of the sunshade (506), the sunlight facing the driver's cab (5) can be blocked in time. This can effectively prevent the light from affecting the driver's vision during construction and avoid the driver being affected when operating the tower arm (4) across the subway line (1).

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