A tower crane verticality detection method

Abstract

The present invention discloses a tower crane verticality detection method, including the steps of installation, remote control transposition, laser measurement, etc., and also discloses a detection device applied to the above detection method, including an annular laser target placed on the tower crane base and an annular fixture installed on the tower crane, the upper surface of the annular laser target is provided with scale lines, the bottom of the annular fixture is provided with an annular beveled tooth groove, and the annular fixture is provided with an annular sliding cavity. The present invention realizes multi-directional and multi-point detection by adopting annular mobile control detection, improves the measurement accuracy, and can quickly fix the annular fixture by isobaric clamping, so that the annular fixture can rise with the tower crane without additional lifting, and can quickly disassemble and assemble the laser detector for verticality detection through a detachable structure, the operation is simpler, the vertical angle can be quickly obtained by the position of the laser point on the annular laser target, and detection can be performed continuously without correction, which reduces the threshold for use.

Description

Technical Field

[0001] The invention relates to the field of tower crane verticality detection, and in particular to a tower crane verticality detection method. Background Art

[0002] At present, the common way to measure the verticality of tower cranes is still to use the theodolite to measure, according to the calculation method of λ=L×θ. However, the tower body is in a state of continuous shaking, and the measurement by the theodolite leads to limited measurement accuracy, which can only be used as a preliminary estimate. The new laser plumb line instrument suspension measurement requires the use of a crane for detection, but the crane is difficult to level and data observation is difficult, resulting in its detection accuracy is not accurate enough, and the required manpower and material resources are large, and it is not convenient to use. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the theodolite and laser plumb meter in the prior art, that is, the measurement accuracy is poor and the use is not convenient, and a tower crane verticality detection method is proposed.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A tower crane verticality detection method comprises the following steps:

[0006] A. Installation: Place the annular laser target in the center of the tower crane foundation, then place the annular fixture on the annular laser target, and then start assembling the tower crane. The annular fixture is fixed on the uppermost standard section of the tower crane, and the annular fixture rises with the lifting and installation of the tower crane standard section.

[0007] B. Remote control transposition: Control the laser detector to move in a circular motion on the annular fixture, so that it moves around the standard section and detects various positions;

[0008] C. Laser measurement: The laser detector emits a laser beam downward, and the laser beam appears as a light spot on the annular laser target. According to the position of the light spot on the annular laser target, the verticality of the tower crane at this height can be obtained;

[0009] The tower crane verticality detection device used in the tower crane verticality detection method comprises an annular laser target placed on the tower crane base and an annular fixture installed on the tower crane, the upper surface of the annular laser target is provided with scale lines, the bottom of the annular fixture is provided with an annular beveled tooth groove, an annular sliding cavity is provided in the annular fixture, an annular sliding port is provided at the bottom of the annular fixture, and a laser detector is slidably installed in the annular sliding cavity and the annular sliding port;

[0010] Four arc-shaped hydraulic chambers are equidistantly arranged in an annular retainer above the annular sliding chamber, a driving ring that horizontally penetrates the four arc-shaped hydraulic chambers is sealed and slidably installed in the annular retainer, a section of each driving ring located in the arc-shaped hydraulic chamber is installed with an arc-shaped piston, a plurality of sealing tubes are equidistantly installed in annularly arranged manner on the upper surface of the annular retainer, a positioning cylinder is fixedly inserted on the centripetal side of each sealing tube, a positioning piston is sealed and slidably installed in each positioning cylinder, a positioning rod is installed on the side of each positioning piston away from the positioning cylinder, one end of each positioning rod away from the positioning cylinder extends to the outside of the positioning cylinder and is installed with a positioning angle plate, and a section of each positioning rod located in the positioning cylinder is sleeved with a return spring whose two ends are respectively fixed on the positioning piston and the inner wall of the positioning cylinder;

[0011] A transmission cavity is defined in the annular fixer, in which a locking shaft and an unlocking shaft are rotatably mounted, respectively; a locking gear is disposed on a fixed sleeve on the locking shaft, and a pawl is disposed on a fixed sleeve on the unlocking shaft; a locking spring fixed to an inner wall of the transmission cavity is disposed on an outer wall of the pawl, and one end of the pawl away from the unlocking shaft abuts against the locking gear; a fixed sleeve of a section of the drive ring located in the transmission cavity is provided with an arc-shaped gear sleeve, and the arc-shaped gear sleeve cooperates with the locking gear.

[0012] Preferably, the laser detector comprises an arc-shaped cover with an opening facing downward, and magnetic plates are slidably inserted on the two arc walls on the outer side of the arc-shaped cover, and the ends of the two magnetic plates away from the arc-shaped cover are inserted in the annular sliding cavity, and the end of each magnetic plate close to the arc-shaped cover extends into the arc-shaped cover and is installed with a limit plate, and a plurality of elastic bands are symmetrically installed on the two arc walls on the inner side of the arc-shaped cover, and the side of each limit plate away from the magnetic plate is centered on the plurality of elastic bands on the same side, and a laser rangefinder is centered on the inner top wall of the arc-shaped cover.

[0013] Preferably, two concentric magnetic rings are embedded on the inner bottom wall of the annular sliding cavity, and the two concentric magnetic rings are respectively against the inner side wall of the annular sliding cavity, and the bottom wall of each magnetic plate has the same magnetic pole as the upper surface of the concentric magnetic ring.

[0014] Preferably, the annular slide is opened on the annular bevel tooth groove, and the annular bevel tooth groove is divided into an inner ring and an outer ring by the annular slide. A driving motor is centrally installed on the two arc walls on the inner side of the arc cover, and the shaft of each driving motor extends to the outside of the arc cover and is installed with a driving bevel gear. The two driving bevel gears have the same slope, and the two driving bevel gears respectively cooperate with the inner ring and outer ring of the annular bevel tooth groove.

[0015] Preferably, each of the sealing tubes is connected to the corresponding arc-shaped hydraulic chamber, the connection point between each sealing tube and the arc-shaped hydraulic chamber is far away from the arc-shaped piston, and the stroke from each arc-shaped piston to the corresponding sealing tube is equal to the stroke from the arc-shaped gear sleeve to the inner wall of the transmission chamber.

[0016] Preferably, the upper end of the locking shaft extends to above the annular fixer and is fixedly mounted with a locking nut, and the upper end of the unlocking shaft extends to above the annular fixer and is fixedly mounted with an unlocking plate.

[0017] The advantages of the present invention are: by adopting annular movement control detection, multi-directional and multi-point detection is realized, the measurement accuracy is improved, and the annular fixture can be quickly fixed by isobaric clamping, which is convenient for the annular fixture to rise with the tower crane, without additional lifting, and the laser detector can be quickly disassembled and assembled through the detachable structure for verticality detection, the operation is simpler, the vertical angle can be quickly obtained through the position of the laser point on the annular laser target, and continuous detection can be performed without correction, which reduces the threshold for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a tower crane verticality detection device proposed by the present invention;

[0019] Figure 2 This is an enlarged view of the annular laser target structure of a tower crane verticality detection device proposed by the present invention;

[0020] Figure 3 A measurement schematic diagram of a tower crane verticality detection device proposed by the present invention;

[0021] Figure 4 A schematic diagram of the structure of the annular fixture of a tower crane verticality detection device proposed by the present invention;

[0022] Figure 5 A schematic diagram showing a partially cutaway portion of an annular fixture of a tower crane verticality detection device proposed by the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the annular sliding cavity portion of a tower crane verticality detection device proposed by the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of the positioning tube part of a tower crane verticality detection device proposed by the present invention;

[0025] Figure 8 A schematic diagram of the structure of a laser detector part of a tower crane verticality detection device proposed by the present invention;

[0026] Fig. 9 A top view cross-sectional view of a laser detector of a tower crane verticality detection device proposed by the present invention;

[0027] Fig.10 for Figure 4 Enlarged view of point A in the middle;

[0028] Fig.11 for Figure 5 Enlarged view of point B in the middle.

[0029] In the figure: 1 annular fixer, 11 arc-shaped hydraulic cavity, 12 transmission cavity, 13 annular sliding cavity, 14 annular bevel tooth groove, 15 annular sliding mouth, 16 concentric magnetic ring, 2 sealing tube, 21 positioning cylinder, 22 positioning piston, 23 positioning rod, 24 return spring, 25 positioning angle plate, 3 driving ring, 31 arc-shaped piston, 32 arc-shaped gear sleeve, 4 laser detector, 41 arc-shaped cover, 42 magnetic plate, 43 limit plate, 44 elastic band, 45 driving motor, 46 driving bevel gear, 47 laser rangefinder, 5 locking shaft, 51 locking gear, 52 locking nut, 6 unlocking shaft, 61 ratchet, 62 unlocking plate, 63 locking spring, 7 annular laser target, 71 scale line. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Reference Figure 1-11 , a tower crane verticality detection method, comprising the following steps:

[0032] A. Installation: Place the annular laser target 7 in the center of the foundation of the tower crane, then place the annular fixture 1 on the annular laser target 7, and then start assembling the tower crane. The annular fixture 1 is fixed on the uppermost standard section of the tower crane, and the annular fixture 1 rises with the jacking installation of the standard section of the tower crane;

[0033] B. Remote control transposition; controlling the laser detector 4 to move in a circular manner on the annular fixture 1, so that it moves around the standard section and detects various positions;

[0034] C. Laser measurement: The laser detector 4 emits a laser beam downward, and the laser beam appears as a light spot on the annular laser target 7. According to the position of the light spot on the annular laser target 7, the verticality of the tower crane at this height can be obtained;

[0035] The tower crane verticality detection device used in the tower crane verticality detection method comprises an annular laser target 7 placed on the tower crane base and an annular fixture 1 installed on the tower crane, the upper surface of the annular laser target 7 is provided with a scale line 71, the bottom of the annular fixture 1 is provided with an annular beveled tooth groove 14, an annular sliding cavity 13 is provided in the annular fixture 1, an annular sliding opening 15 is provided at the bottom of the annular fixture 1, and a laser detector 4 is slidably installed in the annular sliding cavity 13 and the annular sliding opening 15;

[0036] Four arc-shaped hydraulic chambers 11 are equidistantly arranged in an annular retainer 1 above the annular sliding chamber 13. A driving ring 3 is sealed and slidably installed in the annular retainer 1, which runs horizontally through the four arc-shaped hydraulic chambers 11. A section of each driving ring 3 located in the arc-shaped hydraulic chamber 11 is installed with an arc piston 31. A plurality of sealing tubes 2 are equidistantly installed in an annular retainer 1 on the upper surface. A positioning tube 21 is fixedly inserted on the centripetal side of each sealing tube 2. A positioning piston 22 is sealed and slidably installed in each positioning tube 21. A positioning rod 23 is installed on the side of each positioning piston 22 away from the positioning tube 21. One end of each positioning rod 23 away from the positioning tube 21 extends to the outside of the positioning tube 21 and is installed with a positioning angle plate 25. A section of each positioning rod 23 located in the positioning tube 21 is sleeved with a return spring 24 whose two ends are respectively fixed on the positioning piston 22 and the inner wall of the positioning tube 21.

[0037] A transmission chamber 12 is opened in the annular fixer 1, and a locking shaft 5 and an unlocking shaft 6 are rotatably installed in the transmission chamber 12 respectively. A locking gear 51 is fixedly sleeved on the locking shaft 5, and a pawl 61 is fixedly sleeved on the unlocking shaft 6. A locking spring 63 fixed to the inner wall of the transmission chamber 12 is installed on the outer wall of the pawl 61, and one end of the pawl 61 away from the unlocking shaft 6 abuts against the locking gear 51. A fixed sleeve of a section of the drive ring 3 located in the transmission chamber 12 is provided with an arc-shaped gear sleeve 32, and the arc-shaped gear sleeve 32 cooperates with the locking gear 51.

[0038] When the locking shaft 5 rotates, it can drive the locking gear 51 to rotate. The rotation of the locking gear 51 can drive the arc-shaped gear sleeve 32 to drive the driving ring 3 to rotate. Then the driving ring 3 drives the arc-shaped piston 31 to move in the arc-shaped hydraulic chamber 11, so that the pressure in the sealing tube 2 increases, which can increase the pressure in the positioning cylinder 21, so that the positioning piston 22 pushes the positioning rod 23 to move radially, and the positioning rod 23 pushes the positioning angle plate 25 to move toward the tower crane standard section and press against the angle steel of the standard section, so that the annular fixer 1 can be quickly fixed on the standard section;

[0039] The ratchet 61 can abut against the locking gear 51 to prevent the locking gear 51 from reversing and causing the annular fixer 1 to loosen, that is, when the locking gear 51 pushes the arc-shaped gear sleeve 32 to rotate the driving ring 3, the pressure in the arc-shaped hydraulic chamber 11 increases. When the locking shaft 5 stops rotating, the locking gear 51 is abutted by the ratchet 61, and the locking gear 51 cannot reverse, so that the pressure in the sealing tube 2 cannot be reduced, that is, the positioning angle plate 25 can be firmly pressed against the angle steel of the standard section;

[0040] The laser detector 4 moves on the fixed annular fixture 1 for detection. The laser beam emitted by the laser detector 4 appears as a laser point on the annular laser target 7. The verticality of the tower crane is obtained according to the position of the laser point. It is faster and more accurate, and the detection is convenient, no repeated calibration is required, and it is easy to operate.

[0041] The laser detector 4 includes an arc-shaped cover 41 with an opening facing downward, and magnetic plates 42 are slidably inserted on the two arc walls on the outer side of the arc-shaped cover 41. The ends of the two magnetic plates 42 away from the arc-shaped cover 41 are inserted in the annular sliding cavity 13, and the end of each magnetic plate 42 close to the arc-shaped cover 41 extends into the arc-shaped cover 41 and is installed with a limit plate 43. A plurality of elastic bands 44 are symmetrically installed on the two arc walls on the inner side of the arc-shaped cover 41, and the side of each limit plate 43 away from the magnetic plate 42 is centered on the plurality of elastic bands 44 on the same side, and a laser rangefinder 47 is centered on the inner top wall of the arc-shaped cover 41.

[0042] Pressing the magnetic plate 42 inward causes the magnetic plate 42 to push the limiting plate 43 and stretch the elastic band 44, so that the magnetic plate 42 can be retracted into the arc cover 41, and the arc cover 41 can be inserted into the annular sliding cavity 13 from the annular sliding opening 15, and the two magnetic plates 42 are placed in the annular sliding cavity 13, then the magnetic plate 42 loses pressure, and the elastic band 44 pushes the limiting plate 43 and the magnetic plate 42 to extend out of the arc cover 41, so that the arc cover 41 can be hung in the annular sliding cavity 13 through the two magnetic plates 42, so as to achieve quick installation, and the limiting plate 43 can be pulled from the inside of the arc cover 41 to pull the arc cover 41 out of the annular sliding cavity 13, so as to achieve quick disassembly.

[0043] Two concentric magnetic rings 16 are embedded on the inner bottom wall of the annular sliding cavity 13, and the two concentric magnetic rings 16 are respectively against the inner side wall of the annular sliding cavity 13. The bottom wall of each magnetic plate 42 has the same magnetic pole as the upper surface of the concentric magnetic ring 16. The annular sliding mouth 15 is opened on the annular beveled tooth groove 14, and the annular beveled tooth groove 14 is divided into an inner ring and an outer ring by the annular sliding mouth 15. A driving motor 45 is centrally installed on the two arc walls on the inner side of the arc cover 41. The shaft of each driving motor 45 extends to the outside of the arc cover 41 and is installed with a driving bevel gear 46. The two driving bevel gears 46 have the same slope, and the two driving bevel gears 46 respectively cooperate with the inner ring and outer ring of the annular beveled tooth groove 14.

[0044] The concentric magnetic ring 16 and the magnetic plate 42 repel each other, so that the magnetic plate 42 can move upward and drive the arc cover 41 to move upward, so that the arc cover 41 can pull the driving bevel gear 46 to press against the annular bevel tooth groove 14 through the shaft of the driving motor 45, so that the driving bevel gear 46 and the annular bevel tooth groove 14 are more tightly engaged;

[0045] The drive motor 45 can be wirelessly controlled, and the existing energy storage module and wireless module are installed in the arc cover 41, so that ground personnel can control the working state of the drive motor 45. When the two drive motors 45 work at the same time, the two drive bevel gears 46 rotate and roll on the annular bevel tooth groove 14, which can drive the arc cover 41 to move. Since the slopes of the two drive bevel gears 46 are the same, the two drive bevel gears 46 rotate around the axis of the annular fixer 1, which makes the arc cover 41 move in a circle, thereby realizing the free movement of the laser detector 4.

[0046] Each sealing tube 2 is connected to the corresponding arc-shaped hydraulic chamber 11, and the connection point between each sealing tube 2 and the arc-shaped hydraulic chamber 11 is far away from the arc-shaped piston 31. The stroke from each arc-shaped piston 31 to the corresponding sealing tube 2 is equal to the stroke from the arc-shaped gear sleeve 32 to the inner wall of the transmission chamber 12, and the arc-shaped gear sleeve 32 can achieve limiting.

[0047] The upper end of the locking shaft 5 extends to the top of the annular fixer 1 and is fixedly mounted with a locking nut 52 , and the upper end of the unlocking shaft 6 extends to the top of the annular fixer 1 and is fixedly mounted with an unlocking plate 62 .

[0048] The locking nut 52 can be rotated by a portable wrench, so that the locking shaft 5 can be rotated to fix the annular fixer 1. The unlocking shaft 6 can be rotated by toggling the unlocking plate 62, so that the pawl 61 can unlock the locking gear 51. The reset spring 24 rebounds and pushes the positioning piston 22 to reset, so that the pressure in the arc hydraulic chamber 11 increases and pushes the arc piston 31 to reset, so that the arc piston 31 drives the drive ring 3 to reverse, and the arc gear sleeve 32 resets. Release the unlocking plate 62, so that the locking spring 63 rebounds and pushes the pawl 61 to reset and continue to reversely lock the locking gear 51.

[0049] When the present invention is used, the annular laser target 7 is placed in the center of the foundation of the tower crane, and then the annular fixer 1 is placed on the annular laser target 7, and then the tower crane is assembled, and the annular fixer 1 is fixed on the uppermost standard section of the tower crane, and the annular fixer 1 rises with the lifting and installation of the tower crane standard section;

[0050] When the annular fixer 1 is fixed, the locking nut 52 is rotated by a wrench to rotate the locking shaft 5. When the locking shaft 5 rotates, the locking gear 51 can be driven to rotate. The rotation of the locking gear 51 can drive the arc-shaped gear sleeve 32 to drive the driving ring 3 to rotate. Then the driving ring 3 drives the arc-shaped piston 31 to move in the arc-shaped hydraulic chamber 11, so that the pressure in the sealing tube 2 increases, which can increase the pressure in the positioning cylinder 21, so that the positioning piston 22 pushes the positioning rod 23 to move radially, and the positioning rod 23 pushes the positioning angle plate 25 to move toward the standard section of the tower crane and press against the angle steel of the standard section;

[0051] When the laser detector 4 is installed after charging and debugging, the magnetic plate 42 is pressed inward so that the magnetic plate 42 pushes the limit plate 43 and stretches the elastic band 44, so that the magnetic plate 42 can be retracted into the arc cover 41, and the arc cover 41 can be inserted into the annular sliding cavity 13 from the annular sliding port 15, and the two magnetic plates 42 are placed in the annular sliding cavity 13, then the magnetic plate 42 loses pressure, and the elastic band 44 pushes the limit plate 43 and the magnetic plate 42 out of the arc cover 41, so that the arc cover 41 can be hung in the annular sliding cavity 13 through the two magnetic plates 42;

[0052] During control and detection, ground personnel wirelessly control the two drive motors 45 to rotate simultaneously, which causes the two drive bevel gears 46 to rotate and roll on the annular bevel tooth groove 14, thereby driving the arc cover 41 to move along the annular slide 15. During the movement, the laser rangefinder 47 emits a laser beam and presents a laser point on the annular laser target 7. The verticality of the tower crane at this time is obtained based on the position of the laser point on the scale line 71.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tower crane verticality detection method, characterized in that: The following steps are involved: A. Installation: Place the annular laser target in the center of the tower crane foundation, then place the annular fixture on the annular laser target, and then start assembling the tower crane. The annular fixture is fixed on the uppermost standard section of the tower crane, and the annular fixture rises with the lifting and installation of the tower crane standard section. B. Remote control transposition: Control the laser detector to move in a circular motion on the annular fixture, so that it moves around the standard section and detects various positions; C. Laser measurement: The laser detector emits a laser beam downward, and the laser beam appears as a light spot on the annular laser target. According to the position of the light spot on the annular laser target, the verticality of the tower crane at this height can be obtained; The tower crane verticality detection device used in the tower crane verticality detection method comprises an annular laser target placed on the tower crane base and an annular fixture installed on the tower crane, the upper surface of the annular laser target is provided with scale lines, the bottom of the annular fixture is provided with an annular beveled tooth groove, an annular sliding cavity is provided in the annular fixture, an annular sliding port is provided at the bottom of the annular fixture, and a laser detector is slidably installed in the annular sliding cavity and the annular sliding port; Four arc-shaped hydraulic chambers are equidistantly arranged in an annular retainer above the annular sliding chamber, a driving ring that horizontally penetrates the four arc-shaped hydraulic chambers is sealed and slidably installed in the annular retainer, a section of each driving ring located in the arc-shaped hydraulic chamber is installed with an arc-shaped piston, a plurality of sealing tubes are equidistantly installed in annularly arranged manner on the upper surface of the annular retainer, a positioning cylinder is fixedly inserted on the centripetal side of each sealing tube, a positioning piston is sealed and slidably installed in each positioning cylinder, a positioning rod is installed on the side of each positioning piston away from the positioning cylinder, one end of each positioning rod away from the positioning cylinder extends to the outside of the positioning cylinder and is installed with a positioning angle plate, and a section of each positioning rod located in the positioning cylinder is sleeved with a return spring whose two ends are respectively fixed on the positioning piston and the inner wall of the positioning cylinder; A transmission cavity is provided in the annular fixer, a locking shaft and an unlocking shaft are rotatably installed in the transmission cavity respectively, a locking gear is provided on the fixing sleeve on the locking shaft, a pawl is provided on the fixing sleeve on the unlocking shaft, a locking spring fixed to the inner wall of the transmission cavity is installed on the outer wall of the pawl, one end of the pawl away from the unlocking shaft abuts against the locking gear, a section of the fixing sleeve of the drive ring located in the transmission cavity is provided with an arc-shaped gear sleeve, and the arc-shaped gear sleeve cooperates with the locking gear; Each of the sealing tubes is connected to a corresponding arc-shaped hydraulic cavity, and a connecting point between each of the sealing tubes and the arc-shaped hydraulic cavity is far away from the arc-shaped piston.

2. A tower crane verticality detection method according to claim 1, characterized in that: The laser detector includes an arc-shaped cover with an opening facing downward, and magnetic plates are slidably inserted on the two arc walls on the outer side of the arc-shaped cover, and the ends of the two magnetic plates away from the arc-shaped cover are inserted in the annular sliding cavity, and the end of each magnetic plate close to the arc-shaped cover extends into the arc-shaped cover and is installed with a limit plate, and multiple elastic bands are symmetrically installed on the two arc walls on the inner side of the arc-shaped cover, and the side of each limit plate away from the magnetic plate is centered on the multiple elastic bands on the same side, and a laser rangefinder is centered on the inner top wall of the arc-shaped cover.

3. A tower crane verticality detection method according to claim 2, characterized in that: Two concentric magnetic rings are embedded on the inner bottom wall of the annular sliding cavity. The two concentric magnetic rings are respectively against the inner side wall of the annular sliding cavity. The bottom wall of each magnetic plate has the same magnetic pole as the upper surface of the concentric magnetic ring.

4. A tower crane verticality detection method according to claim 2, characterized in that: The annular slide is opened on the annular bevel tooth groove, and the annular bevel tooth groove is divided into an inner ring and an outer ring by the annular slide. A driving motor is centrally installed on the two arc walls on the inner side of the arc cover. The shaft of each driving motor extends to the outer side of the arc cover and is installed with a driving bevel gear. The two driving bevel gears have the same slope, and the two driving bevel gears respectively cooperate with the inner ring and the outer ring of the annular bevel tooth groove.

5. A tower crane verticality detection method according to claim 1, characterized in that: The stroke from each arc-shaped piston to the corresponding sealing tube is equal to the stroke from the arc-shaped gear sleeve to the inner wall of the transmission chamber.

6. A tower crane verticality detection method according to claim 1, characterized in that: The upper end of the locking shaft extends to the upper part of the annular fixer and is fixedly mounted with a locking nut, and the upper end of the unlocking shaft extends to the upper part of the annular fixer and is fixedly mounted with an unlocking plate.

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