Safety early warning method for tower crane crossing existing rail transit line

Abstract

The invention relates to the technical field of tower crane engineering safety early warning, in particular to a safety early warning method for a tower crane crossing an existing rail transit line, which comprises a tower body fixedly mounted on the outer side of a subway line, the top of the tower body is rotatably connected with a rotary table, and the top of the rotary table is fixedly provided with a tower arm; a cab is fixedly mounted on the left side of the tower arm, a first mounting ring and a second mounting ring are fixedly mounted at the joint of the tower body and the rotary table, two buffer boxes are fixedly mounted on the outer side of the first mounting ring, and sensing plates are fixedly mounted at the positions, corresponding to the buffer boxes, of the outer side of the second mounting ring. By means of the design, a driver can be reminded to conduct early warning in time, meanwhile, enough reaction time is reserved for the driver to conduct operation, and the safety of tower crane construction is guaranteed while the civilized construction requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of safety early warning for tower crane projects, and in particular to a safety early warning method for a tower crane crossing an existing rail transit line. Background Art

[0002] Tower cranes, also known as tower cranes, play an irreplaceable and important role in the construction field. China has had its own tower cranes since the 1990s, but the scale was very small at that time. Generally, several or more than a dozen tower cranes were operating at the same time. Crane drivers were cautious enough to avoid tower crane collision accidents. With the rapid development of China's economy and the booming construction industry, the use of tower cranes has increased dramatically, and China has developed into the world's number one tower crane country.

[0003] At present, during the construction of the tower crane site, when the tower crane is close to the subway line, due to the close distance between the tower crane and the subway, the rotation radius of the tower crane arm will partially cover the subway during construction. Civilized construction requires that the tower crane cannot cross over the subway. Currently, it can only be controlled by the tower crane driver. When operating the tower crane arm, it is necessary to control its rotation range. The driver must concentrate during operation, and the technical requirements for the driver are also high. When the driver is tired or slack off playing with the mobile phone, the tower crane will be about to cross over the subway, and there will be no timely warning. Not only will it be subject to administrative penalties for violating civilized construction regulations, but it may also cause safety accidents in serious cases, resulting in casualties.

[0004] Therefore, it is particularly important to design a safety warning method for tower cranes crossing existing rail transit lines to solve the above-mentioned defects. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention designs a safety warning method for a tower crane crossing an existing rail transit line. The safety warning method for a tower crane crossing an existing rail transit line aims to solve the technical problem that under the prior art, when a tower crane is under construction at a construction site, it is impossible to timely warn that the rotation radius of the tower arm covers the subway, which will not only result in administrative penalties for violating civilized construction regulations, but may also cause safety accidents and casualties in serious cases.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A safety early warning method for a tower crane crossing an existing rail transit line comprises a tower body fixedly installed on the outside of a subway line, the top of the tower body is rotatably connected to a turntable, the top of the turntable is fixedly installed with a tower arm, a driver's cab is fixedly installed on the left side of the tower arm, a first mounting ring and a second mounting ring are respectively fixedly installed at the connection between the tower body and the turntable, two groups of buffer boxes are fixedly installed on the outside of the first mounting ring, induction plates are fixedly installed at positions corresponding to the buffer boxes on the outside of the second mounting ring, a buffer mechanism is installed inside the buffer box, and an audible and visual alarm is fixedly installed on the top of the driver's cab.

[0008] As a preferred solution of the present invention, a mounting plate is fixedly installed on the left end of the top of the cab, a hydraulic push rod is fixedly installed on the top of the mounting plate, a push plate is fixedly installed on the driving end of the hydraulic push rod, a connecting seat is fixedly installed on the right side of the mounting plate, a rotating shaft is rotatably connected inside the connecting seat, a sunshade is fixedly installed on the right end of the rotating shaft, a driven gear is fixedly installed on the left end of the rotating shaft, and the top of the push plate is meshed with the driven gear through multiple sets of teeth.

[0009] As a preferred solution of the present invention, the push plate is slidably connected to the mounting plate via a limiting groove, and the rotating shaft is rotatably connected to the connecting seat via a bearing.

[0010] As a preferred solution of the present invention, the first mounting ring and the second mounting ring are both composed of a first half ring and a second half ring, both ends of the first half ring are fixedly connected with connecting heads, both ends of the second half ring are fixedly connected with locking heads, and the inner sides of the first half ring and the second half ring are fixedly connected with rubber liners.

[0011] As a preferred solution of the present invention, locking columns are slidably connected at both ends of the locking head, locking holes are opened at positions corresponding to the locking columns in the connecting head, operating handles are fixedly connected to the opposite ends of the two groups of locking columns, a first spring is movably installed inside the locking head and between the two groups of operating handles, and the interiors of the two groups of operating handles are slidably connected to the locking head through grooves.

[0012] As a preferred solution of the present invention, two groups of position sensors are fixedly installed on the bottom of the first half ring, and sensing blocks are installed at positions on the bottom of the sensing plate corresponding to the position sensors. The position sensors are electrically connected to the sound and light alarm.

[0013] As a preferred solution of the present invention, a box cover is fixedly installed on the bottom of the buffer box, a mounting groove is opened at a position on the bottom of the buffer box corresponding to the box cover, and the four corners of the box cover are fixedly connected to the buffer box by mounting screws.

[0014] As a preferred solution of the present invention, the buffer mechanism is internally slidably connected with a movable plate, a sliding rod is fixedly installed on one side of the movable plate, both ends of the sliding rod are slidably connected with sliding sleeves, the outer side of the sliding rod and the side opposite to the two groups of sliding sleeves are sleeved with a second spring, the outer sides of the two groups of sliding sleeves are rotatably connected with transmission rods, a connecting plate is rotatably connected between the two groups of transmission rods, one end of the connecting plate located on the outer side of the buffer box is fixedly connected with the buffer plate, and shock absorbers are fixedly installed at both ends of the other side of the movable plate.

[0015] As a preferred solution of the present invention, the left and right ends of the movable plate are slidably connected to the buffer box through a slide groove, the outer side of the slide rod is fixedly connected with a connecting sleeve, the outer side of the connecting sleeve is fixedly connected with a rubber buffer pad, and a movable groove is opened at a position on the outside of the buffer box corresponding to the buffer plate.

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

[0017] S1. First install the tower body on the outside of the subway line, and then put the first half ring and the second half ring on the outside of the tower body and the turntable;

[0018] S2. Fix the connecting head and the locking head, and quickly install the first mounting ring and the second mounting ring on the outside of the tower body and the turntable respectively;

[0019] S3, when the tower crane driver controls the turntable to rotate, when the induction plate on the second mounting ring reaches the position of the buffer box, the induction block contacts the position of the position sensor, triggering the sound and light alarm to sound and light alarm, thereby promptly reminding the driver that the tower arm is about to cross the top of the subway line;

[0020] S4. After the sensing block on the sensing plate contacts the position of the position sensor, the driver cannot immediately control the turntable to stop rotating after the sound and light alarm is triggered in time. The buffer mechanism is used to buffer the impact force on the sensing plate, thereby leaving enough reaction time for the driver to control the turntable to stop rotating in time and avoid the tower arm crossing over the subway line;

[0021] S5. An angle-adjustable awning is installed above the cab. By adjusting the direction of the awning to block the sunlight directed toward the cab in time, it can effectively prevent the light from affecting the line of sight during the construction process and avoid the driver being affected by the tower arm operating across the subway line.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, through the coordinated design of the first mounting ring, the second mounting ring, the induction plate and the sound and light alarm, when the tower body is installed on the outside of 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 driver controls the turntable to rotate, when the induction plate on the second mounting ring reaches the position of the buffer box, the induction block contacts the position of the position sensor, triggering the sound and light alarm to sound and light alarm, thereby promptly reminding the driver that the tower arm is about to cross the top of the subway line, playing a role of prompting and warning, and further improving the safety of tower crane construction.

[0024] 2. In the present 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 of the position sensor and the sound and light alarm is triggered in time, the driver cannot immediately control the turntable to stop rotating. At this time, the induction plate will contact the buffer plate as it continues to move, and the buffer plate pushes the connecting plate to retract into the inside of the buffer box, and pushes the sliding sleeve to slide on the outside of the sliding rod under the transmission of the transmission rod, so that the sliding sleeve compresses the second spring, and the second spring is used to buffer 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, and the first impact force is further buffered by two sets of shock absorbers, thereby leaving enough reaction time for the driver, and being able to control the turntable to stop rotating in time to avoid the tower arm crossing over the subway line, thereby meeting the requirements of civilized construction while ensuring the safety of tower crane construction. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 It 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 It is a schematic diagram of the structure of the connection between the tower body and the turntable of the present invention;

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

[0029] Figure 5 It is a schematic diagram of the structure 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 of point B in the middle;

[0033] Fig. 9 Schematic diagram of the internal structure of the locking head.

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

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

[0036] Example:

[0037] See also Figure 1-Figure 9 , the present invention provides a technical solution:

[0038] A safety early warning method for a tower crane crossing an existing rail transit line comprises a tower body 2 fixedly installed on the outside of a subway line 1, the top of the tower body 2 is rotatably connected to a turntable 3, a tower arm 4 is fixedly installed on the top of the turntable 3, a 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 respectively fixedly installed at the connection between the tower body 2 and the turntable 3, two groups of buffer boxes 8 are fixedly installed on the outside of the first mounting ring 6, induction plates 9 are fixedly installed at positions corresponding to the buffer boxes 8 on the outside of the second mounting ring 7, a buffer mechanism 10 is installed inside the buffer box 8, and an audible and visual alarm 11 is fixedly installed on the top of the cab 5.

[0039] First, 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 driving 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 to the inside of 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, and the top of the push plate 503 is meshed with the driven gear 507 through a plurality of tooth grooves 508. 501 is fixedly installed on the top of the cab 5, and the awning 506 is installed above the cab 5. The push plate 503 is pushed by the hydraulic push rod 502, and the driven gear 507 is driven to rotate by the tooth groove 508 inside the push plate 503, thereby driving the rotating shaft 505 to rotate, so as to adjust the angle of the awning 506. By adjusting the direction of the awning 506 to block the sunlight directed to the cab 5 in time, it can effectively prevent the light from affecting the line of sight during the construction process, and prevent the driver from being affected by the operation of the tower arm 4 crossing the subway line 1.

[0040] Furthermore, the push plate 503 is slidably connected to the mounting plate 501 via a limiting groove 509, and the rotating shaft 505 is rotatably connected to the connecting seat 504 via a bearing 510. When the push plate 503 is pushed, its travel is limited by the limiting groove 509, while its movement stability is improved.

[0041] Then, the first mounting ring 6 and the second mounting ring 7 are both composed of the first half ring 601 and the second half ring 602, both ends of the first half ring 601 are fixedly connected with connecting heads 603, both ends of the second half ring 602 are fixedly connected with locking heads 604, and 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 put on the outer sides of the tower body 2 and the turntable 3, the connecting head 603 is fixed by the locking head 604, so that the first mounting ring 6 and the second mounting ring 7 are respectively installed on the outer sides of the tower body 2 and the turntable 3. At the same time, due to the provision of the rubber lining 605, damage to the outer sides of the tower body 2 and the turntable 3 after installation can be avoided.

[0042] Furthermore, both ends of the locking head 604 are slidably connected with locking columns 606, and locking holes 607 are opened at positions corresponding to the locking columns 606 in the connecting head 603. The opposite ends of the two sets of locking columns 606 are fixedly connected with operating handles 608. The interior of the locking head 604 and between the two sets of operating handles 608 are movably installed with a first spring 609. The interiors of the two sets of operating handles 608 are slidably connected with the locking head 604 through the through grooves 610, so that the first half ring 601 and When the second half ring 602 is sleeved on the outer side of the tower body 2 and the turntable 3, first pinch the two sets of operating handles 608 to retract the two sets of locking columns 606 into the interior of the locking head 604, then insert the locking head 604 into the inner side of the connecting head 603, and then release the operating handle 608 to allow the locking column 606 to be inserted into the interior 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 facilitating and quickly installing the first mounting ring 6 and the second mounting ring 7.

[0043] Among them, two groups of position sensors 611 are fixedly installed at the bottom of the first half ring 601, and a sensing block 612 is installed at the position corresponding to the position sensor 611 at the bottom of the sensing plate 9. The position sensor 611 is electrically connected to the sound and light 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 turntable 3, the position sensor 611 is installed on the first half ring 601 that constitutes the first mounting ring 6. When the tower crane driver controls the turntable 3 to rotate, when the sensing plate 9 on the second mounting ring 7 reaches the position of the buffer box 8, the sensing block 612 contacts the position of the position sensor 611, triggering the sound and light alarm 11 to sound and light alarm, thereby promptly reminding the driver that the tower arm 4 is about to cross the top of the subway line 1, which plays a role of prompting and warning, and further improves the safety of tower crane construction.

[0044] Furthermore, a box cover 801 is fixedly installed on the bottom of the buffer box 8, and a mounting groove 802 is opened at a position on the bottom of the buffer box 8 corresponding to the box cover 801. The four corners of the box cover 801 are fixedly connected to the buffer box 8 by mounting screws, and the box cover 801 on the outside of the buffer box 8 is installed in the mounting groove 802 by mounting screws. While ensuring the fixing effect of the box cover 801, the box cover 801 can be disassembled, which is convenient for the inspection and maintenance of the internal parts of the buffer box 8.

[0045] Secondly, the buffer mechanism 10 is internally slidably connected with a movable plate 1001, a sliding rod 1002 is fixedly installed on one side of the movable plate 1001, and sliding sleeves 1003 are slidably connected at both ends of the sliding rod 1002. A second spring 1004 is sleeved on the outer side of the sliding rod 1002 and on the side opposite to the two groups of sliding sleeves 1003. The outer sides of the two groups of sliding sleeves 1003 are rotatably connected with transmission rods 1005, and a connecting plate 1006 is rotatably connected between the two groups of transmission rods 1005. The connecting plate 1006 is fixedly connected with a buffer plate 1007 at one end located on the outer side of the buffer box 8, and shock absorbers 1008 are fixedly installed at both ends of the other side of the movable plate 1001. After the sensing block 612 on the sensing plate 9 contacts the position of 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 induction plate 9 moves. At this time, the induction plate 9 will contact the buffer plate 1007 as it continues to move. The buffer plate 1007 pushes the connecting plate 1006 to retract into the buffer box 8. Under the transmission of the transmission rod 1005, the sliding sleeve 1003 is pushed to slide on the outside of the sliding rod 1002, so that the sliding sleeve 1003 compresses the second spring 1004, and the second spring 1004 is used to buffer the impact force of the induction plate 9. As the impact force increases and reaches the compression limit of the second spring 1004, the moving plate 1001 is pushed inside the buffer box 8, and the two sets of shock absorbers 1008 are used to further buffer the first impact force, thereby leaving enough reaction time for the driver to control the turntable 3 to stop rotating in time, and avoid the tower arm 4 crossing over the subway line 1, thereby meeting the requirements of civilized construction while ensuring the safety of tower crane construction.

[0046] Finally, the left and right ends of the movable plate 1001 are slidably connected to the buffer box 8 through the slide 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, and a movable groove 1012 is opened at the position of the outer side of the buffer box 8 corresponding to the buffer plate 1007. The movable plate 1001 slides inside the buffer box 8 through the slide groove 1009, thereby ensuring its movement stability. At the same time, when the connecting plate 1006 locks the inside of the buffer box 8, the slide rod 1002 is protected by the rubber buffer pad 1011 on the outside of the connecting sleeve 1010 to prevent the connecting plate 1006 from causing damage to the slide rod 1002 after reaching the pressure limit. When the induction plate 9 pushes the buffer plate 1007, the buffer plate 1007 will enter the inner side of the movable groove 1012 after reaching the pressure limit.

[0047] In this embodiment, the implementation scenario is specifically as follows: when the tower body 2 is installed on the outside of the subway line 1 for tower crane construction, the first half ring 601 and the second half ring 602 are first sleeved on the outside of the tower body 2 and the turntable 3, and the two sets of operating handles 608 are pinched to retract the two sets of locking columns 606 into the inside of the locking head 604, and then the locking head 604 is inserted into the inner side of the connecting head 603, and then the operating handle 608 is released to allow the locking column 606 to be inserted into the inside of the locking hole 607 under the rebound of the first spring 609, so as to fix the connecting head 603 and the locking head 604, thereby facilitating and quickly connecting the first mounting ring 6 and the second mounting ring 6. The rings 7 are respectively installed on the outside of the tower body 2 and the turntable 3. When the tower crane driver controls the turntable 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, triggering the sound and light alarm 11 to sound and light alarm, thereby promptly reminding the driver that the tower arm 4 is about to cross the top of the subway line 1, playing a role of prompting and warning. After the induction block 612 on the induction plate 9 contacts the position of the position sensor 611, the sound and light alarm 11 is triggered in time, and the driver cannot immediately control the turntable 3 to stop rotating. At this time, the induction plate 9 is continuously The buffer plate 1007 will contact the buffer plate 1007 when the buffer plate 1007 moves continuously. The buffer plate 1007 pushes the connecting plate 1006 to retract into the buffer box 8. Under the transmission of the transmission rod 1005, the sliding sleeve 1003 is pushed to slide on the outside of the sliding rod 1002, 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. As the impact force increases and reaches the pressure limit of the second spring 1004, the moving plate 1001 is pushed inside the buffer box 8. The two sets of shock absorbers 1008 are used to further buffer the first impact force, thereby leaving enough reaction time for the driver. The turntable 3 can be controlled to stop rotating in time to avoid the tower arm 4 crossing over the subway line 1. At the same time, when the driver is in the cab 5 for operation, an adjustable sunshade 506 is installed above the cab 5. By adjusting the direction of the sunshade 506, the sunlight directed to the cab 5 can be blocked in time, which can effectively prevent the light from affecting the line of sight during the construction process. The whole operation process is simple and convenient. The present invention can timely remind the driver to give an early warning through design, and at the same time leave the driver enough reaction time to operate, which meets the requirements of civilized construction and ensures the safety of tower crane construction.

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

[0049] 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;

[0050] S2, fix the connecting head 603 and the locking head 604, 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;

[0051] S3, when the tower crane driver controls the turntable 3 to rotate, when the induction plate 9 on the second mounting ring 7 reaches the position of the buffer box 8, the induction block 612 contacts the position of the position sensor 611, triggering the sound and light alarm 11 to sound and light alarm, thereby promptly reminding the driver that the tower arm 4 is about to cross the top of the subway line 1;

[0052] S4, after the sensing block 612 on the sensing plate 9 contacts the position of 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, and the buffer mechanism 10 is used to buffer the impact force on the sensing plate 9, thereby leaving enough reaction time for the driver to control the turntable 3 to stop rotating in time and avoid the tower arm 4 crossing over the subway line 1;

[0053] S5. An angle-adjustable sunshade 506 is installed above the cab 5. By adjusting the direction of the sunshade 506 to timely block the sunlight directed toward the cab 5, it can effectively prevent the light from affecting the vision during the construction process, and avoid the driver being affected in operating the tower arm 4 to cross the subway line 1.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety warning method for a tower crane crossing an existing rail transit line, comprising a tower body (2) fixedly installed outside a subway line (1), characterized in that: The top of the tower body (2) is rotatably connected to a turntable (3), a tower arm (4) is fixedly installed on the top of the turntable (3), a 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 respectively fixedly installed at the connection between the tower body (2) and the turntable (3), two groups of buffer boxes (8) are fixedly installed on the outside of the first mounting ring (6), induction plates (9) are fixedly installed at positions corresponding to the buffer boxes (8) on the outside of the second mounting ring (7), a buffer mechanism (10) is installed inside the buffer box (8), and an audible and visual alarm (11) is fixedly installed on the top of the cab (5).

2. A safety early warning method for tower crane crossing over an existing rail transit line according to claim 1, characterized in that: A mounting plate (501) is fixedly mounted on the left end of the top of the cab (5), a hydraulic push rod (502) is fixedly mounted on the top of the mounting plate (501), a push plate (503) is fixedly mounted on the driving end of the hydraulic push rod (502), a connecting seat (504) is fixedly mounted 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 mounted on the right end of the rotating shaft (505), a driven gear (507) is fixedly mounted on the left end of the rotating shaft (505), and the top of the push plate (503) is meshed with the driven gear (507) through a plurality of sets of tooth grooves (508).

3. A safety early warning method for tower crane crossing over an existing rail transit line according to claim 2, characterized in that: The push plate (503) is slidably connected to the mounting plate (501) via a limiting groove (509), and the rotating shaft (505) is rotatably connected to the connecting seat (504) via a bearing (510).

4. The method for safety early warning of a tower crane crossing an existing rail transit line according to claim 1 is characterized in that: 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 with connecting heads (603); both ends of the second half ring (602) are fixedly connected with locking heads (604); and the inner sides of the first half ring (601) and the second half ring (602) are fixedly connected with rubber liners (605).

5. A safety early warning method for tower crane crossing over an existing rail transit line according to claim 4, characterized in that: The two ends of the locking head (604) are slidably connected with locking columns (606), and a locking hole (607) is opened at a position corresponding to the locking column (606) inside the connecting head (603). The opposite ends of the two groups of locking columns (606) are fixedly connected with operating handles (608). A first spring (609) is movably installed inside the locking head (604) and between the two groups of operating handles (608). The insides of the two groups of operating handles (608) are slidably connected to the locking head (604) through a groove (610).

6. A safety early warning method for tower crane crossing over an existing rail transit line according to claim 4, characterized in that: Two groups of position sensors (611) are fixedly mounted on the bottom of the first half ring (601), a sensing block (612) is mounted at a position on the bottom of the sensing plate (9) corresponding to the position sensor (611), and the position sensor (611) is electrically connected to the sound and light alarm (11).

7. The method for safety early warning of a tower crane crossing an existing rail transit line according to claim 1 is characterized in that: A box cover (801) is fixedly mounted on the bottom of the buffer box (8); a mounting groove (802) is provided at a position of the bottom of the buffer box (8) corresponding to the box cover (801); and the four corners of the box cover (801) are fixedly connected to the buffer box (8) by mounting screws.

8. The method for safety early warning of a tower crane crossing an existing rail transit line according to claim 1, characterized in that: The buffer mechanism (10) is internally slidably connected to a movable plate (1001), a sliding rod (1002) is fixedly mounted on one side of the movable plate (1001), sliding sleeves (1003) are slidably mounted at both ends of the sliding rod (1002), a second spring (1004) is sleeved on the outer side of the sliding rod (1002) and located on the opposite side of the two groups of sliding sleeves (1003), the outer sides of the two groups of sliding sleeves (1003) are rotatably connected to transmission rods (1005), a connecting plate (1006) is rotatably connected between the two groups of transmission rods (1005), one end of the connecting plate (1006) located on the outer side of the buffer box (8) is fixedly connected to a buffer plate (1007), and shock absorbers (1008) are fixedly mounted on both ends of the other side of the movable plate (1001).

9. A safety early warning method for tower crane crossing over an existing rail transit line according to claim 8, characterized in that: The left and right ends of the movable plate (1001) are slidably connected to the buffer box (8) via a sliding groove (1009); a connecting sleeve (1010) is fixedly connected to the outer side of the sliding rod (1002); a rubber buffer pad (1011) is fixedly connected to the outer side of the connecting sleeve (1010); and a movable groove (1012) is provided at a position on the outer side of the buffer box (8) corresponding to the buffer plate (1007).

10. The method for safety early warning of a tower crane crossing an existing rail transit line according to claim 1, characterized in that: The steps include: 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 connecting head (603) and the locking head (604), and quickly install the first mounting ring (6) and the second mounting ring (7) on the outer sides of the tower body (2) and the turntable (3), respectively; S3, when the tower crane driver controls the turntable (3) to rotate, when the sensing plate (9) on the second mounting ring (7) reaches the position of the buffer box (8), the sensing block (612) contacts the position of the position sensor (611), triggering the sound and light alarm (11) to sound and light alarm, thereby promptly reminding the driver that the tower arm (4) is about to cross the subway line (1); S4, after the sensing block (612) on the sensing plate (9) contacts the position of 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, and the buffer mechanism (10) is used to buffer the impact force on the sensing plate (9), thereby leaving enough reaction time for the driver to control the turntable (3) to stop rotating in time, and to prevent the tower arm (4) from crossing over the subway line (1); S5. A sunshade (506) with an adjustable angle is installed above the cab (5). By adjusting the direction of the sunshade (506) to timely block the sunlight directed toward the cab (5), it is possible to effectively prevent the light from affecting the vision during the construction process, thereby preventing the driver from being affected in operating the tower arm (4) to cross over the subway line (1).

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