A lifting method for a boom based on multi-section wire rope

Abstract

This invention provides a method for hoisting a boom based on a multi-section wire rope, including determining the boom's center of gravity and determining the sliding length of a second wire rope on a pulley. The method for calculating the sliding length of the second wire rope on the pulley involves setting a first positioning point at the left limit positioning point of the pulley's displacement and a second positioning point at the right limit positioning point of the pulley's displacement; calculating the sliding length of the second wire rope at the first and second positioning points respectively; and then determining the maximum sliding length of the second wire rope. This ensures that the maximum sliding length of the second wire rope is sufficient to allow the pulley to move between the left and right limit positioning points.

Description

Technical Field

[0001] This invention relates to the field of lifting equipment technology, and specifically to a lifting method for a boom based on multiple sections of wire rope. Background Technology

[0002] Pulleys are used for lifting objects. A steel wire is wound around the pulleys of the pulverizer to raise the object. The object is lifted or moved by changing the direction of the traction wire rope. Currently, the steel wire rope on existing pulverizers is an integral part of the structure. This means that if the wire rope is insufficient in length, the pulverizer cannot be connected to the object. Furthermore, in existing technologies, the entire boom is considered as a single unit when determining the center of gravity of the crane; however, this method is prone to data inaccuracies. Summary of the Invention

[0003] This invention provides a method for hoisting a boom using multiple sections of wire rope, which solves the problem of insufficient length of a single wire rope by hoisting the boom using multiple sections of wire rope.

[0004] To achieve the above objectives, the technical solution of the present invention is: a method for hoisting a boom based on multiple sections of wire rope. The crane hoists the boom through a pulley structure, which includes a pulley and a wire rope assembly. The wire rope assembly includes a first wire rope, a second wire rope, and a third wire rope. One end of the first wire rope is detachably connected to one end of the second wire rope, and one end of the third wire rope is detachably connected to the other end of the second wire rope. The second wire rope is wound around the pulley. The other end of the first wire rope is provided with a first hook, and the other end of the third wire rope is provided with a second hook. The first hook and the second hook are used to connect to the boom.

[0005] The hoisting method includes the following steps:

[0006] A1. Determine the center of gravity of the boom.

[0007] A2. Set up a set of lifting lugs on each side of the center of gravity of the boom, and set up a distance L1 between the left lifting lug Q and the right lifting lug W.

[0008] A3. Determine the sliding length of the second wire rope on the pulley required to achieve the swing of the boom, and wind the second wire rope around the pulley and connect it to the first wire rope and the third wire rope.

[0009] The required sliding length of the second wire rope on the pulley to achieve boom swing is determined as follows:

[0010] (1). Preset the first positioning point J and the second positioning point P; the first positioning point is the position where the trolley moves to the position directly above the left lifting lug Q, and the second positioning point is the position where the trolley moves to the position directly above the right lifting lug W.

[0011] (2). When the car reaches the first positioning point, the distance between the left lifting lug Q and the trolley pulley is set and the first auxiliary line QJ is set. The first auxiliary line QJ connects the left lifting lug and the trolley pulley. When the trolley reaches the first positioning point, the distance between the right lifting lug W and the top of the first auxiliary line QJ is set and the second auxiliary line WJ is set. The second auxiliary line WJ connects the right lifting lug and the top of the first auxiliary line QJ.

[0012] (3). Using the formula cos QJW=(WJ 2 + QJ 2 - L1 2 ) / (2*WJ*QJ); Calculate the angle ∠QJW between the first auxiliary line QJ and the second auxiliary line WJ.

[0013] (4) Set a third auxiliary line AE. The third auxiliary line AE is a perpendicular line passing through the midpoint E of the second auxiliary line WJ and intersecting the first auxiliary line QJ. The intersection point of the third auxiliary line AE and the first auxiliary line QJ is point A.

[0014] (5) Calculate the length of AE.

[0015] (6) Connect the right lug to point A with the diagonal line AW and calculate the length of the diagonal line AW.

[0016] (7) Calculate the difference K1 between the length QA between the left lug and point A and the oblique line AW.

[0017] (8) When the trolley reaches the second positioning point, the distance between the right lifting lug and the trolley pulley is preset and a fourth auxiliary line WP is set. The fourth auxiliary line WP connects the right lifting lug and the trolley pulley. When the trolley reaches the second positioning point, the distance between the left lifting lug and the top of the fourth auxiliary line WP is preset and a fifth auxiliary line QP is set. The fifth auxiliary line QP connects the left lifting lug and the top of the fourth auxiliary line WP.

[0018] (9). Using the formula cos QPW=(WP) 2 + QP 2 - L1 2 ) / (2*WP*QP); Calculate the angle ∠QPW between the fourth auxiliary line WP and the fifth auxiliary line QP.

[0019] (10). Set the sixth auxiliary line BR. The sixth auxiliary line BR is a perpendicular line passing through the midpoint R of the fifth auxiliary line QP and intersecting the fourth auxiliary line WP. The intersection point of the sixth auxiliary line BR and the fourth auxiliary line WP is point B.

[0020] (11). Calculate the length of the oblique line BR.

[0021] (12). Connect the left lug to point B with the diagonal line BQ and calculate the length of the diagonal line BQ;

[0022] (13). Calculate the difference K2 between the length WB between the right lug and point B and the oblique line BQ.

[0023] (14). Determine the size of K2 and K1; if K2 is greater than K1, then set K2 as the sliding distance of the wire rope; if K1 is greater than K2, then set K1 as the sliding distance of the wire rope.

[0024] A4. Connect the pulley to the crane, connect the first wire rope to the left lifting lug, and connect the second hook to the right lifting lug.

[0025] A5. Within the time limit, determine whether the force on the lug assembly is normal. If it is normal, proceed to A6 after the time limit ends.

[0026] A6. The crane horizontally lifts the boom and connects it with the crane's slewing platform;

[0027] A7. After the base of the boom is connected to the slewing platform, proceed to A8.

[0028] A8. The pulley rotation drives the second steel wire rope to move, and the boom swings from a horizontal state to an inclined state.

[0029] The above method involves setting a time limit and conducting a trial lift before hoisting the boom. Within the time limit, observe whether the boom is under normal stress. If so, determine that the boom is under normal stress and then lift the boom again. This method ensures good safety. At the same time, determine the center of gravity of the boom before hoisting to keep the boom stable during the lifting process.

[0030] During the hoisting of the boom, the crane connects to the boom via a pulley. When the pulley lifts the boom, it first lifts the base section. After the tail section of the boom is initially connected to the slewing platform, the pulley then lowers the front section of the boom onto the support frame. This allows the entire boom to be lifted off the ground when the crane is insufficient, enabling the crane to perform the next action. During the hoisting process, the boom switches between an inclined and a horizontal position.

[0031] Simultaneously, in the horizontal state, the length of the wire rope connecting the pulley to the left lifting lug is the same as the length of the wire rope connecting the pulley to the right lifting lug; in the inclined state, when the pulley drives the boom to swing, the length of the wire rope connecting the pulley to the left lifting lug and the length of the wire rope connecting the pulley to the right lifting lug will change. The sliding length of the wire rope can be calculated by the difference between the length of the wire rope connecting the pulley to the left lifting lug and the length of the wire rope connecting the pulley to the right lifting lug.

[0032] However, as the trolley moves, its position changes, and the sliding length of the wire rope also changes as the trolley moves between the left and right limit positioning points. Based on this, a first positioning point J is preset, which is the positioning point for the left limit of the trolley. The sliding length of the wire rope when the trolley reaches the left limit is calculated by setting the first positioning point J. A second positioning point P is preset, which is the positioning point for the trolley when it moves to the right limit. The sliding length of the wire rope when the trolley reaches the right limit is calculated by setting the second positioning point P. Then, by comparing the sliding lengths of the wire rope at the first positioning point J and the second positioning point P, the maximum sliding length of the wire rope is calculated. The calculated maximum sliding length of the wire rope satisfies the requirement for the trolley to move between the left and right limit positioning points.

[0033] Furthermore, the boom includes the boom root section, boom middle section, boom front section, main hook pulley frame, auxiliary hook pulley frame, stabilizing winch, rigging winch, and boom walkway. In A1, the center of gravity of the boom is determined as follows:

[0034] S1. Obtain the weight T1 of the boom root segment and determine the center of gravity of the boom root segment.

[0035] Obtain the weight T2 of the middle section of the boom and determine the center of gravity of the middle section of the boom.

[0036] Obtain the weight T3 of the front section of the boom and determine the center of gravity of the front section of the boom.

[0037] Obtain the weight T4 of the main hook pulley frame and determine the center of gravity of the main hook pulley frame.

[0038] Obtain the weight T5 of the auxiliary hook pulley frame and determine its center of gravity.

[0039] Obtain the weight T6 of the stabilizing winch and determine the center of gravity of the stabilizing winch.

[0040] Obtain the weight T7 of the rigging winch and determine the center of gravity of the rigging winch.

[0041] Obtain the weight T8 of the boom walkway and determine the center of gravity of the boom walkway.

[0042] S2. Assemble the boom root section, boom middle section, boom front section, main hook pulley frame, auxiliary hook pulley frame, stabilizing winch, rigging winch and boom walkway into a boom.

[0043] S3. Starting from the shaft hole of the boom root section, along the length of the boom, obtain the following distances: X1, X2, X3, X4, X5, X6, X7, X8; X8, X9; X1, X1, X2, X2, X3; X4, X5, X6; X7, X8; X8, X9; X1, X1, X2, X3; X1, X2, X3; X1, X4, X5; X1, X6, X7, X8; X1, X1, X1, X1, X1, X1, X2 ...

[0044] S4. Using the formula Cn = Tn * Bn, where n is 1-8, calculate the torques C1 of the boom root section, C2 of the boom middle section, C3 of the boom front section, C4 of the main hook pulley frame, C5 of the auxiliary hook pulley frame, C6 of the stabilizing winch, C7 of the rigging winch, and C8 of the boom walkway.

[0045] S5. Calculate the moment C of the boom, where C is the sum of the moments C1 of the boom root section, C2 of the boom middle section, C3 of the boom front section, C4 of the main hook pulley frame, C5 of the auxiliary hook pulley frame, C6 of the stabilizing winch, C7 of the rigging winch, and C8 of the boom walkway.

[0046] S6. Calculate the weight T of the boom, where T is the sum of the weights of the boom root section T1, the middle section of the boom T2, the front section of the boom T3, the main hook pulley frame T4, the auxiliary hook pulley frame T5, the stabilizing winch T6, the rigging winch T7, and the boom walkway T8.

[0047] S7. Calculate the distance X between the center of gravity of the boom and the shaft hole using the formula X = C / T, and then determine the center of gravity of the entire boom.

[0048] The above method calculates the torque of each component by taking into account the weight of the boom root section, boom middle section, boom front section, main hook pulley frame, auxiliary hook pulley frame, stabilizing winch, rigging winch, and boom walkway, as well as the distance between the center of gravity of each component and the shaft hole of the boom root section. Then, by using the overall torque and overall weight of the boom, the distance between the center of gravity of the boom and the shaft hole of the boom root section can be calculated, thus determining the location of the boom's center of gravity; this method has high accuracy.

[0049] Furthermore, each lifting lug assembly includes a left lifting lug and a right lifting lug arranged sequentially along the length of the boom from the front section to the root section of the boom; the left lifting lug is symmetrically arranged on both sides of the boom, and the right lifting lug is symmetrically arranged on both sides of the boom.

[0050] Furthermore, in step (5) of A3, the length of the oblique line AE is calculated by using the formula AE=EJ * tanQJW.

[0051] In step (6) of A3, the length of the diagonal line AW is calculated using the formula AW. 2 =WE 2 + AE 2 Calculate the length of the diagonal line AW;

[0052] In step (7) of A3, the calculation method for QA is as follows: first, through AJ... 2 =EJ 2 + AE 2 Calculate the length of AJ, and then calculate the length of QA using QA = QJ - AJ.

[0053] Furthermore, in step (11) of A3, the length of the oblique line BR is calculated by using the formula BR = RP * tan QPW.

[0054] In step (12) of A3, the length of the diagonal line BQ is calculated using the formula BQ. 2 =QR 2 +BR 2 Calculate the length of the diagonal line BQ;

[0055] In step (13) of A3, WB is calculated by first passing through BP. 2 =RP 2 +BR 2 Calculate the length of BP, and then calculate the length of WB using WB=WP-BP. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the pulley structure in the invention.

[0057] Figure 2 This is a cross-sectional view of the pulley device of the trolley structure in this invention.

[0058] Figure 3 This is a schematic diagram of the wire rope assembly of the pulley structure in this invention.

[0059] Figure 4 This is a schematic diagram of the boom in a horizontal position in this invention.

[0060] Figure 5 This is a schematic diagram of the trolley reaching the first positioning point in this invention.

[0061] Figure 6 This is a schematic diagram of the trolley reaching the second positioning point in this invention.

[0062] Figure 7 This is a schematic diagram of the boom root section in this invention.

[0063] Figure 8 This is a schematic diagram of the middle section of the boom in this invention.

[0064] Figure 9 This is a schematic diagram of the front section of the boom in this invention.

[0065] Figure 10 This is a schematic diagram of the main hook pulley frame in this invention.

[0066] Figure 11 This is a schematic diagram of the auxiliary hook pulley frame in this invention.

[0067] Figure 12 This is a schematic diagram of the boom in this invention.

[0068] Figure 13 This is a schematic diagram of the lug assembly in this invention. Detailed Implementation

[0069] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0070] like Figure 1-13 As shown, a method for hoisting a boom based on a multi-section wire rope is described. The crane hoists the boom through a pulley structure. The pulley structure includes a pulley device 1 and a wire rope assembly 2. The pulley assembly includes a pulley 11, a first stop plate 12, and a second stop plate 13. A cavity 14 is formed between the first stop plate 12 and the second stop plate 13. A connecting shaft 15 connecting the first stop plate 12 and the second stop plate 13 is provided in the cavity 14. The pulley 11 is rotatably disposed in the connecting shaft 15.

[0071] The wire rope assembly 2 includes a first wire rope 21, a second wire rope 22, and a third wire rope 23. The second wire rope 22 is wound around the pulley 11, and both ends of the second wire rope 22 extend out of the cavity 14. One end of the first wire rope 21 is detachably connected to one end of the second wire rope 22, and one end of the third wire rope 23 is detachably connected to the other end of the second wire rope 22. The other ends of the first wire rope 21 and the third wire rope 23 are used to connect to an object.

[0072] By setting up a detachable connection between a first wire rope 21, a second wire rope 22, and a third wire rope 23; when the length of the second wire rope 22 is insufficient, the length of the wire rope group 2 is extended by connecting it with the first wire rope 21 and the third wire rope 23; thus enabling the wire rope group 2 to connect the pulley device 1 to the object.

[0073] The second wire rope 22 is provided with shackles 24 at both ends, the first wire rope 21 is connected to the first hook (not shown in the figure) at both ends, and the second wire rope 22 is connected to the second hook (not shown in the figure) at both ends; the first wire rope 21 is detachably connected to the shackles 24 and the object through the first hook; the second wire rope 22 is detachably connected to the shackles 24 and the object through the second hook.

[0074] The width A1 of the cavity 14 is smaller than the width A2 of the shackle 24. The first baffle 12 and the second baffle 13 limit the shackle 22. Because the width of the cavity is smaller than the width of the shackle 24, the shackle 24 is prevented from entering the cavity 14, resulting in a simple structure. The first baffle 12 and the second baffle limit the shackle 22, preventing it from entering the cavity 14 and colliding with the pulley 11, thus protecting the pulley 11.

[0075] In this embodiment, the object is a boom 3, which includes a boom root section 31, a boom middle section 32, a boom front section 33, a main hook pulley frame 34, a secondary hook pulley frame 35, a stabilizing winch, a rigging winch, and a boom walkway. The boom 3 is formed by assembling the boom root section 31, the boom middle section 32, the boom front section 33, the main hook pulley frame 34, the secondary hook pulley frame 35, the stabilizing winch, the rigging winch, and the boom walkway. The assembly of the boom 1 is prior art and will not be described in detail here.

[0076] The boom is provided with two sets of lifting lug assemblies arranged sequentially from the front section 13 to the root section 11 along its own length direction; each set of lifting lug assemblies is provided with a left lifting lug Q and a right lifting lug W in sequence along the length direction of the boom from the front section to the root section; the left lifting lug Q is symmetrically arranged on both sides of the boom, and the right lifting lug W is symmetrically arranged on both sides of the boom.

[0077] The first hook is connected to the left lifting lug Q, and the second hook is connected to the right lifting lug W.

[0078] In this embodiment, the length of the second wire rope 22 is greater than the lengths of the first wire rope 21 and the third wire rope 23. By providing a longer second wire rope 22, it is easier for the second wire rope 22 to move on the pulley 11.

[0079] The pulley assembly also includes a crossbeam 16 and a rope guard 17, with the first stop plate 12 and the second stop portion connected by the crossbeam 16. The crossbeam 16 achieves a fixed connection between the first stop plate 12 and the second stop plate 13.

[0080] There is one or more rope guards 17. In this embodiment, there are four rope guards 17 arranged around the pulley 11. The second wire rope 22 is disposed between the pulley 11 and the rope guards 17. The rope guards 17 are used to limit the second wire rope 22 in the radial direction of the pulley 11. By limiting the second wire rope 22 with the rope guards 17, the second wire rope 22 is prevented from falling off in the radial direction of the pulley 11.

[0081] The hoisting method includes the following steps:

[0082] A1. Determine the center of gravity of the boom.

[0083] A2. Set up a set of lifting lugs on each side of the center of gravity of the boom, and set up a distance L1 between the left lifting lug Q and the right lifting lug W.

[0084] A3. Determine the required sliding length of the second wire rope on the pulley to achieve the boom swing, and wind the second wire rope around the pulley and connect it to the first and third wire ropes. In this embodiment, one set of lifting lug assemblies is selected to determine the sliding length of the second wire rope on the pulley.

[0085] The required sliding length of the second wire rope on the pulley to achieve boom swing is determined as follows:

[0086] (1). Preset the first positioning point J and the second positioning point P; the first positioning point is the position where the trolley moves to the position directly above the left lifting lug Q, and the second positioning point is the position where the trolley moves to the position directly above the right lifting lug W.

[0087] (2). When the car reaches the first positioning point, the distance between the left lifting lug Q and the trolley pulley is set and the first auxiliary line QJ is set. The first auxiliary line QJ connects the left lifting lug and the trolley pulley. When the trolley reaches the first positioning point, the distance between the right lifting lug W and the top of the first auxiliary line QJ is set and the second auxiliary line WJ is set. The second auxiliary line WJ connects the right lifting lug and the top of the first auxiliary line QJ.

[0088] (3). Using the formula cos QJW=(WJ 2 + QJ 2 - L1 2 ) / (2*WJ*QJ); Calculate the angle ∠QJW between the first auxiliary line QJ and the second auxiliary line WJ.

[0089] (4) Set a third auxiliary line AE. The third auxiliary line AE is a perpendicular line passing through the midpoint E of the second auxiliary line WJ and intersecting the first auxiliary line QJ. The intersection point of the third auxiliary line AE and the first auxiliary line QJ is point A.

[0090] (5) Calculate the length of AE. Specifically, the length of the oblique line AE is calculated using the formula AE=EJ * tan QJW.

[0091] (6) Connect the right lug to point A with a diagonal line AW and calculate the length of the diagonal line AW. Specifically, the length of the diagonal line AW is calculated using the formula AW. 2 =WE 2 + AE 2 Calculate the length of the diagonal line AW.

[0092] (7) Calculate the difference K1 between the length QA between the left lug and point A and the diagonal line AW. Specifically, QA is calculated by first using AJ... 2 =EJ 2 + AE 2 Calculate the length of AJ, and then calculate the length of QA using QA = QJ - AJ.

[0093] (8) When the trolley reaches the second positioning point, the distance between the right lifting lug and the trolley pulley is preset and a fourth auxiliary line WP is set. The fourth auxiliary line WP connects the right lifting lug and the trolley pulley. When the trolley reaches the second positioning point, the distance between the left lifting lug and the top of the fourth auxiliary line WP is preset and a fifth auxiliary line QP is set. The fifth auxiliary line QP connects the left lifting lug and the top of the fourth auxiliary line WP.

[0094] (9). Using the formula cos QPW=(WP) 2 + QP 2 - L1 2 ) / (2*WP*QP); Calculate the angle ∠QPW between the fourth auxiliary line WP and the fifth auxiliary line QP.

[0095] (10). Set the sixth auxiliary line BR. The sixth auxiliary line BR is a perpendicular line passing through the midpoint R of the fifth auxiliary line QP and intersecting the fourth auxiliary line WP. The intersection point of the sixth auxiliary line BR and the fourth auxiliary line WP is point B.

[0096] (11). Calculate the length of the oblique line BR. Specifically, calculate the length of the oblique line BR using the formula BR = RP * tan QPW.

[0097] (12). Connect the left lug to point B with the diagonal line BQ and calculate the length of the diagonal line BQ. Specifically, the length of the diagonal line BQ is calculated using the formula BQ. 2 =QR 2 +BR 2 Calculate the length of the slant line BQ.

[0098] (13). Calculate the difference K2 between the length WB between the right lug and point B and the diagonal line BQ. Specifically, the calculation method for WB is as follows: first pass through BP... 2 =RP 2 +BR 2 Calculate the length of BP, and then calculate the length of WB using WB=WP-BP.

[0099] (14). Determine the size of K2 and K1; if K2 is greater than K1, then set K2 as the sliding distance of the wire rope; if K1 is greater than K2, then set K1 as the sliding distance of the wire rope.

[0100] A4. Connect the trolley to the crane, connect the first wire rope to the left lifting lug, and connect the second hook to the right lifting lug. In this embodiment, the crane is connected to two trolleys, one of which is connected to a set of lifting lug assemblies, and the other trolley is connected to another set of lifting lug assemblies.

[0101] A5. Within the time limit, determine whether the force on the lifting lug assembly is normal. If it is normal, proceed to A6 after the time limit ends. In this embodiment, the time limit is 5 minutes.

[0102] A6. The crane horizontally lifts the boom and connects it with the crane's slewing platform;

[0103] A7. After the base of the boom is connected to the slewing platform, proceed to A8.

[0104] A8. The pulley rotation drives the second steel wire rope to move, and the boom swings from a horizontal state to an inclined state.

[0105] The above method involves setting a time limit and conducting a trial lift before hoisting the boom. Within the time limit, observe whether the boom is under normal stress. If so, determine that the boom is under normal stress and then lift the boom again. This method ensures good safety. At the same time, determine the center of gravity of the boom before hoisting to keep the boom stable during the lifting process.

[0106] During the hoisting of the boom, the crane connects to the boom via a pulley. When the pulley lifts the boom, it first lifts the base section. After the tail section of the boom is initially connected to the slewing platform, the pulley then lowers the front section of the boom onto the support frame. This allows the entire boom to be lifted off the ground when the crane is insufficient, enabling the crane to perform the next action. During the hoisting process, the boom switches between an inclined and a horizontal position.

[0107] In a horizontal position, the length of the wire rope connecting the pulley to the left lifting lug is the same as the length of the wire rope connecting the pulley to the right lifting lug. In an inclined position, when the pulley drives the boom to swing, the lengths of the wire rope connecting the pulley to the left lifting lug and the wire rope connecting the pulley to the right lifting lug will change. The sliding length of the wire rope can be calculated by the difference between the lengths of the wire rope connecting the pulley to the left lifting lug and the wire rope connecting the pulley to the right lifting lug.

[0108] However, as the trolley moves, its position changes, and the sliding length of the wire rope also changes as the trolley moves between the left and right limit positioning points. Based on this, a first positioning point J is preset, which is the positioning point for the left limit of the trolley. The sliding length of the wire rope when the trolley reaches the left limit is calculated by setting the first positioning point J. A second positioning point P is preset, which is the positioning point for the trolley when it moves to the right limit. The sliding length of the wire rope when the trolley reaches the right limit is calculated by setting the second positioning point P. Then, by comparing the sliding lengths of the wire rope at the first positioning point J and the second positioning point P, the maximum sliding length of the wire rope is calculated. The calculated maximum sliding length of the wire rope satisfies the requirement for the trolley to move between the left and right limit positioning points.

[0109] In the above method, in step A1, the center of gravity of the boom is determined as follows:

[0110] S1. Obtain the weight T1 of the boom root segment and determine the center of gravity of the boom root segment.

[0111] Obtain the weight T2 of the middle section of the boom and determine the center of gravity of the middle section of the boom.

[0112] Obtain the weight T3 of the front section of the boom and determine the center of gravity of the front section of the boom.

[0113] Obtain the weight T4 of the main hook pulley frame and determine the center of gravity of the main hook pulley frame.

[0114] Obtain the weight T5 of the auxiliary hook pulley frame and determine its center of gravity.

[0115] Obtain the weight T6 of the stabilizing winch and determine the center of gravity of the stabilizing winch.

[0116] Obtain the weight T7 of the rigging winch and determine the center of gravity of the rigging winch.

[0117] Obtain the weight T8 of the boom walkway and determine the center of gravity of the boom walkway.

[0118] S2. Assemble the boom root section, boom middle section, boom front section, main hook pulley frame, auxiliary hook pulley frame, stabilizing winch, rigging winch and boom walkway into a boom.

[0119] S3. Starting from the shaft hole of the boom root section, along the length of the boom, obtain the following distances: X1, X2, X3, X4, X5, X6, X7, X8; X8, X9; X1, X1, X2, X2, X3; X4, X5, X6; X7, X8; X8, X9; X1, X1, X2, X3; X1, X2, X3; X1, X4, X5; X1, X6, X7, X8; X1, X1, X1, X1, X1, X1, X2 ...

[0120] S4. Using the formula Cn = Tn * Bn, where n is 1-8, calculate the torques C1 of the boom root section, C2 of the boom middle section, C3 of the boom front section, C4 of the main hook pulley frame, C5 of the auxiliary hook pulley frame, C6 of the stabilizing winch, C7 of the rigging winch, and C8 of the boom walkway.

[0121] S5. Calculate the moment C of the boom, where C is the sum of the moments C1 of the boom root section, C2 of the boom middle section, C3 of the boom front section, C4 of the main hook pulley frame, C5 of the auxiliary hook pulley frame, C6 of the stabilizing winch, C7 of the rigging winch, and C8 of the boom walkway.

[0122] S6. Calculate the weight T of the boom, where T is the sum of the weights of the boom root section T1, the middle section of the boom T2, the front section of the boom T3, the main hook pulley frame T4, the auxiliary hook pulley frame T5, the stabilizing winch T6, the rigging winch T7, and the boom walkway T8.

[0123] S7. Calculate the distance X between the center of gravity of the boom and the shaft hole using the formula X = C / T, and then determine the center of gravity of the entire boom.

[0124] The above method calculates the torque of each component by taking into account the weight of the boom root section, boom middle section, boom front section, main hook pulley frame, auxiliary hook pulley frame, stabilizing winch, rigging winch, and boom walkway, as well as the distance between the center of gravity of each component and the shaft hole of the boom root section. Then, by using the overall torque and overall weight of the boom, the distance between the center of gravity of the boom and the shaft hole of the boom root section can be calculated, thus determining the location of the boom's center of gravity; this method has high accuracy.

Claims

1. A method for hoisting a boom based on a multi-section wire rope, wherein a crane hoists the boom by a trolley structure, characterized in that, The trolley structure comprises a pulley and a steel wire rope set, the steel wire rope set comprises a first steel wire rope, a second steel wire rope and a third steel wire rope, one end of the first steel wire rope is detachably connected with one end of the second steel wire rope, one end of the third steel wire rope is detachably connected with the other end of the second steel wire rope, and the second steel wire rope is wound on the pulley; the other end of the first steel wire rope is provided with a first hook, the other end of the third steel wire rope is provided with a second hook, and the first hook and the second hook are used for being connected with a hoist arm, The hoisting method comprises the following steps: A1, determining the gravity center of the hoist arm; A2, a group of lifting lug assemblies are respectively preset on both sides of the gravity center of the hoist arm, and the distance L1 between the left lifting lug Q and the right lifting lug W is preset; A3, determining the sliding length of the second steel wire rope on the pulley required for realizing the swing of the hoist arm, winding the second steel wire rope on the pulley and connecting the second steel wire rope with the first steel wire rope and the third steel wire rope; The sliding length of the second steel wire rope on the pulley required for realizing the swing of the hoist arm is determined, and specifically: (1) a first positioning point J and a second positioning point P are preset, the first positioning point is the position where the trolley moves to the left lifting lug Q, and the second positioning point is the position where the trolley moves to the right lifting lug W; (2) the distance between the left lifting lug Q and the trolley pulley when the trolley reaches the first positioning point is preset, and a first auxiliary line QJ is set, the first auxiliary line QJ connects the left lifting lug and the trolley pulley; the distance between the right lifting lug W and the top of the first auxiliary line QJ when the trolley reaches the first positioning point is preset, and a second auxiliary line WJ is set, the second auxiliary line WJ connects the right lifting lug and the top of the first auxiliary line QJ; (3). The angle of the included angle ∠QJW between the first auxiliary line QJ and the second auxiliary line WJ is calculated by the formula cos QJW= (WJ 2 + QJ 2 - L1 2 ) / (2 * WJ * QJ); (4) a third auxiliary line AE is set, the third auxiliary line AE is a vertical line passing through the midpoint E of the second auxiliary line WJ and intersects with the first auxiliary line QJ, and the intersection point of the third auxiliary line AE and the first auxiliary line QJ is point A; (5) the length of AE is calculated; (6) the slant AW is connected between the right lifting lug and point A, and the length of the slant AW is calculated; (7) the difference K1 between the length QA between the left lifting lug and point A and the slant AW is calculated; (8) the distance between the right lifting lug and the trolley pulley when the trolley reaches the second positioning point is preset, and a fourth auxiliary line WP is set, the fourth auxiliary line WP connects the right lifting lug and the trolley pulley; the distance between the left lifting lug and the top of the fourth auxiliary line WP when the trolley reaches the second positioning point is preset, and a fifth auxiliary line QP is set, the fifth auxiliary line QP connects the left lifting lug and the top of the fourth auxiliary line WP; (9). The angle of the fourth auxiliary line WP and the fifth auxiliary line QP is calculated by the formula cos QPW= (WP 2 + QP 2 - L1 2 ) / (2 * WP * QP); and ∠QPW (10) a sixth auxiliary line BR is set, the sixth auxiliary line BR is a vertical line passing through the midpoint R of the fifth auxiliary line QP and intersects with the fourth auxiliary line WP, and the intersection point of the sixth auxiliary line BR and the fourth auxiliary line WP is point B; (11) the length of the slant BR is calculated; (12) the slant BQ is connected between the left lifting lug and point B, and the length of the slant BQ is calculated; (13) the difference K2 between the length WB between the right lifting lug and point B and the slant BQ is calculated; (14) the sizes of K2 and K1 are judged; if K2 is greater than K1, K2 is set as the sliding distance of the steel wire rope, and if K1 is greater than K2, K1 is set as the sliding distance of the steel wire rope; A4, connecting the trolley with the crane, connecting the first steel wire rope with the left lifting lug, and connecting the second hook with the right lifting lug; A5, within the time limit, judging whether the stress of the lifting lug assembly is normal, if normal, then after the time limit, A6 is performed; A6, the crane horizontally lifts the boom to be connected with the slewing platform of the crane; A7, after the boom root is connected with the slewing platform, A8 is performed; A8, the pulley rotates to drive the second steel wire rope to move, and the boom swings from the horizontal state to the inclined state.

2. The method of claim 1, wherein the method is characterized by: The boom comprises a boom root section, a boom middle section, a boom front section, a main hook pulley frame, a vice hook pulley frame, a stable cable winch, a rigging winch, and a boom walkway, and in A1, the center of gravity of the boom is determined, specifically: S1, the weight T1 of the boom root section is obtained, and the center of gravity of the boom root section is determined; the weight T2 of the boom middle section is obtained, and the center of gravity of the boom middle section is determined; the weight T3 of the boom front section is obtained, and the center of gravity of the boom front section is determined; the weight T4 of the main hook pulley frame is obtained, and the center of gravity of the main hook pulley frame is determined; the weight T5 of the vice hook pulley frame is obtained, and the center of gravity of the vice hook pulley frame is determined; the weight T6 of the stable cable winch is obtained, and the center of gravity of the stable cable winch is determined; the weight T7 of the rigging winch is obtained, and the center of gravity of the rigging winch is determined; the weight T8 of the boom walkway is obtained, and the center of gravity of the boom walkway is determined; S2, the boom root section, the boom middle section, the boom front section, the main hook pulley frame, the vice hook pulley frame, the stable cable winch, the rigging winch, and the boom walkway are assembled into the boom; S3, taking the shaft hole of the boom root section as the starting point, along the length direction of the boom, the distance X1 between the center of gravity of the boom root section and the shaft hole, the distance X2 between the center of gravity of the boom middle section and the shaft hole, the distance X3 between the center of gravity of the boom front section and the shaft hole, the distance X4 between the center of gravity of the main hook pulley frame and the shaft hole, the distance X5 between the center of gravity of the vice hook pulley frame and the shaft hole, the distance X6 between the center of gravity of the stable cable winch and the shaft hole, the distance X7 between the center of gravity of the rigging winch and the shaft hole, and the distance X8 between the center of gravity of the boom walkway and the shaft hole are obtained; S4, through the formula Cn = Tn * Bn, n is 1-8, the moment C1 of the boom root section, the moment C2 of the boom middle section, the moment C3 of the boom front section, the moment C4 of the main hook pulley frame, the moment C5 of the vice hook pulley frame, the moment C6 of the stable cable winch, the moment C7 of the rigging winch, and the moment C8 of the boom walkway are calculated; S5, the moment C of the boom is calculated, C is the sum of the moment C1 of the boom root section, the moment C2 of the boom middle section, the moment C3 of the boom front section, the moment C4 of the main hook pulley frame, the moment C5 of the vice hook pulley frame, the moment C6 of the stable cable winch, the moment C7 of the rigging winch, and the moment C8 of the boom walkway; S6, the weight T of the boom is calculated, T is the sum of the weight T1 of the boom root section, the weight T2 of the boom middle section, the weight T3 of the boom front section, the weight T4 of the main hook pulley frame, the weight T5 of the vice hook pulley frame, the weight T6 of the stable cable winch, the weight T7 of the rigging winch, and the weight T8 of the boom walkway; S7, through the formula X = C / T, the distance X between the center of gravity of the boom and the shaft hole is calculated, and the center of gravity of the entire boom is determined.

3. The method of claim 1, wherein the method is characterized by: Each lifting lug assembly comprises a left lifting lug and a right lifting lug arranged in sequence along the length of the lifting arm from the front section to the root section of the lifting arm; the left lifting lug is symmetrically arranged on both sides of the lifting arm, and the right lifting lug is symmetrically arranged on both sides of the lifting arm.

4. The method of claim 1, wherein the method is characterized by: In step (5) of A3, the length of the oblique line AE is calculated by the formula AE=EJ*tan QJW. In step (6) of A3, the length of the diagonal line AW is calculated using the formula AW. 2 =WE 2 + AE 2 Calculate the length of the diagonal line AW; In step (7) of A3, the calculation method of QA is, first, calculate the length of AJ through AJ = QJ / EJ 2 =EJ 2 + AE 2 , then calculate the length of QA through QA = QJ - AJ.

5. The method of claim 1, wherein the method is characterized by: In step (11) of A3, the length of the oblique line BR is calculated by the formula BR=RP*tan QPW. In step (12) of A3, the length of the diagonal line BQ is calculated using the formula BQ. 2 =QR 2 +BR 2 Calculate the length of the diagonal line BQ; In step (13) of A3, the calculation method of WB is that first, the length of BP is calculated by BP=RP 2 =RP 2 + BR 2 , and then the length of WB is calculated by WB=WP-BP.

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