A method of assembling a crane

Abstract

The application provides an assembling method of a crane, when a boom root section is connected with a slewing platform, the crane lowers a boom front section of the boom onto a rest frame, the rest frame supports the boom, and then the crane loosens the connection between the crane and the boom, so that the crane can perform other actions; meanwhile, the rest frame supports the boom, the boom does not swing, the stability is good, and the safety is good; thus, the boom and the triangular frame support can be provided with a swing steel wire rope.

Description

Technical Field

[0001] This invention relates to the field of lifting equipment, and more specifically to a method for assembling a crane. Background Technology

[0002] The assembly of marine lifting equipment generally involves first hoisting the base onto the hull using a crane, then hoisting the slewing platform onto the base and connecting it, then hoisting the tripod onto the slewing platform and connecting it, and finally hoisting the boom onto the slewing platform and connecting it. Current technology involves horizontally lifting the boom, connecting the boom root section to the slewing platform, and then continuing to hold the boom with the crane. This prevents the crane from performing other actions. Furthermore, after the boom is connected to the slewing platform, wire ropes need to be installed on the boom and tripod; however, since the boom is in a suspended state at this time, there is a safety hazard. Summary of the Invention

[0003] This invention provides a method for assembling a crane. After the boom is connected to the slewing platform, the boom is placed on a support frame to facilitate the crane to perform other actions. At the same time, the boom is supported by the support frame, which ensures good safety when wire ropes are installed on the boom and the tripod.

[0004] To achieve the above objectives, the technical solution of the present invention is: a method for assembling a crane, the crane including a base, a slewing platform, a tripod, and a boom, the boom being supported by a support frame, the method for assembling the crane including the following steps:

[0005] Z1. A first target point and a second target point are preset. The first target point is the installation position of the crane, and the second target point is the installation position of the support frame. The first target point is provided with a base.

[0006] Z2. The crane lifts the base to the first target point, and the base is connected to the base.

[0007] Z3. The crane will lift the support frame to the second target point.

[0008] Z4. The crane lifts the tripod to the first target point, and the tripod is connected to the slewing platform.

[0009] Z5. Determine the center of gravity of the boom, and pre-set a set of lifting lugs on both sides of the center of gravity of the boom, and pre-set the distance L1 between the left lifting lug Q and the right lifting lug W.

[0010] Z6. Calculate the slip distance of the wire rope on the crane's trolley.

[0011] Z7. The crane lifts the boom to the second target point and connects the boom root section to the slewing platform. After the boom root is connected to the slewing platform, proceed to Z8.

[0012] Z8. The crane lowers the front section of the boom onto the resting platform.

[0013] Z9. A swing wire rope is threaded between the boom and the tripod.

[0014] In the above method, after the boom root section is connected to the slewing platform, the crane lowers the front section of the boom onto the support frame. The support frame supports the boom, allowing the crane to loosen the connection with the boom and perform other actions. At the same time, the support frame prevents the boom from swaying, ensuring good stability and safety. This also facilitates the installation of swing wire ropes between the boom and the tripod support.

[0015] Furthermore, calculating the slip distance of the wire rope on the crane's trolley includes the following steps:

[0016] (1). Preset the first positioning point J and the second positioning point P; the first positioning point J 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.

[0017] (2). When the trolley reaches the first positioning point J, the distance between the left lifting lug Q and the trolley pulley is preset and a 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 J, the distance between the right lifting lug W and the top of the first auxiliary line QJ 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.

[0018] (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.

[0019] (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.

[0020] (5) Calculate the length of AE.

[0021] (6) Connect the right lug to point A with the diagonal line AW and calculate the length of the diagonal line AW.

[0022] (7) Calculate the difference K1 between the length QA between the left lug and point A and the oblique line AW.

[0023] (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.

[0024] (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.

[0025] (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.

[0026] (11). Calculate the length of the oblique line BR.

[0027] (12). Connect the left lug to point B with the diagonal line BQ and calculate the length of the diagonal line BQ.

[0028] (13). Calculate the difference K2 between the length WB between the right lug and point B and the oblique line BQ.

[0029] (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.

[0030] In the above method, during the lifting of the boom, the crane connects to the boom via a pulley. When the pulley lifts the boom, it first raises the boom. After the base 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, allowing the crane to perform the next action. During the lifting process, the boom switches between an inclined state and a horizontal state.

[0031] Meanwhile, when hoisting the boom, there may be situations where the length of a single wire rope is insufficient. In such cases, it is necessary to calculate the sliding distance of the wire rope on the pulley to determine the length of the wire rope.

[0032] 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.

[0033] 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.

[0034] 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 Z5, determining the boom's center of gravity includes the following steps:

[0035] S1. Obtain the weight T1 of the boom root segment and determine the center of gravity of the boom root segment.

[0036] Obtain the weight T2 of the middle section of the boom and determine the center of gravity of the middle section of the boom.

[0037] Obtain the weight T3 of the front section of the boom and determine the center of gravity of the front section of the boom.

[0038] Obtain the weight T4 of the main hook pulley frame and determine the center of gravity of the main hook pulley frame.

[0039] Obtain the weight T5 of the auxiliary hook pulley frame and determine its center of gravity.

[0040] Obtain the weight T6 of the stabilizing winch and determine the center of gravity of the stabilizing winch.

[0041] Obtain the weight T7 of the rigging winch and determine the center of gravity of the rigging winch.

[0042] Obtain the weight T8 of the boom walkway and determine the center of gravity of the boom walkway.

[0043] 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.

[0044] S3. Starting from the shaft hole of the boom root section, along the length of the boom, obtain the following distances: X1 between the center of gravity of the boom root section and the shaft hole; X2 between the center of gravity of the boom middle section and the shaft hole; X3 between the center of gravity of the boom front section and the shaft hole; X4 between the center of gravity of the main hook pulley frame and the shaft hole; X5 between the center of gravity of the auxiliary hook pulley frame and the shaft hole; X6 between the center of gravity of the stabilizing winch and the shaft hole; X7 between the center of gravity of the rigging winch and the shaft hole; and X8 between the center of gravity of the boom walkway and the shaft hole.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Furthermore, in step (5) of Z6, the length of the oblique line AE is calculated by using the formula AE=EJ * tanQJW.

[0052] In step (6) of Z6, 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.

[0053] In step (7) of Z6, 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.

[0054] Furthermore, in step (11) of Z6, the length of the oblique line BR is calculated by using the formula BR = RP * tan QPW.

[0055] In step (12) of Z6, 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.

[0056] In step (13) of Z6, WB is calculated by first passing 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

[0057] Figure 1 This is a schematic diagram of the pulley structure in the invention.

[0058] Figure 2 This is a cross-sectional view of the pulley device of the trolley structure in this invention.

[0059] Figure 3 This is a schematic diagram of the wire rope assembly of the pulley structure in this invention.

[0060] Figure 4 This is a schematic diagram of the boom in a horizontal position in this invention.

[0061] Figure 5 This is a schematic diagram of the trolley reaching the first positioning point in this invention.

[0062] Figure 6 This is a schematic diagram of the trolley reaching the second positioning point in this invention.

[0063] Figure 7 This is a schematic diagram of the boom root section in this invention.

[0064] Figure 8 This is a schematic diagram of the middle section of the boom in this invention.

[0065] Figure 9 This is a schematic diagram of the front section of the boom in this invention.

[0066] Figure 10 This is a schematic diagram of the main hook pulley frame in this invention.

[0067] Figure 11 This is a schematic diagram of the auxiliary hook pulley frame in this invention.

[0068] Figure 12 This is a schematic diagram of the boom in this invention.

[0069] Figure 13 This is a schematic diagram of the lug assembly in this invention.

[0070] Figure 14 This is a schematic diagram of the crane in this invention. Detailed Implementation

[0071] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0072] like Figure 1-14 As shown, a method for assembling a crane is described. The crane includes a base 4, a slewing platform 5, a tripod 6, and a boom 3. The boom 3 is supported by a support frame 7. The crane lifts the base, slewing platform, tripod, boom, and support frame using a pulley.

[0073] The trolley of the crane includes a pulley device 1 and a wire rope assembly 2. The pulley 11 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] In this embodiment, the object includes 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.

[0079] 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.

[0080] The first hook is connected to the left lifting lug Q, and the second hook is connected to the right lifting lug W.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] The crane method includes the following steps:

[0085] Z1. A first target point and a second target point are preset. The first target point is the installation position of the crane, and the second target point is the installation position of the support frame. The first target point is provided with a base.

[0086] Z2. The crane lifts the base to the first target point, and the base is connected to the base.

[0087] Z3. The crane will lift the support frame to the second target point.

[0088] Z4. The crane lifts the tripod to the first target point, and the tripod is connected to the slewing platform.

[0089] Z5. Determine the center of gravity of the boom, and pre-set a set of lifting lugs on both sides of the center of gravity of the boom, and pre-set the distance L1 between the left lifting lug Q and the right lifting lug W.

[0090] Z6. Calculate the slip distance of the wire rope on the crane's trolley.

[0091] Z7. The crane lifts the boom to the second target point and connects the boom root section to the slewing platform. After the boom root is connected to the slewing platform, proceed to Z8.

[0092] Z8. The crane lowers the front section of the boom onto the resting platform.

[0093] Z9. A swing wire rope is threaded between the boom and the tripod.

[0094] In the above method, after the boom root section is connected to the slewing platform, the crane lowers the front section of the boom onto the support frame. The support frame supports the boom, allowing the crane to loosen the connection with the boom and perform other actions. Simultaneously, the support frame prevents the boom from swaying, ensuring good stability and safety. This also facilitates the installation of the swing wire rope between the boom and the tripod support. In this embodiment, the method for installing the swing wire rope is existing technology and will not be described in detail here.

[0095] The specific calculation of the slip distance of the wire rope on the crane's trolley is as follows:

[0096] (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.

[0097] (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.

[0098] (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.

[0099] (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.

[0100] (5) Calculate the length of AE. Specifically, the length of the oblique line AE is calculated using the formula AE=EJ * tan QJW.

[0101] (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.

[0102] (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.

[0103] (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.

[0104] (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.

[0105] (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.

[0106] (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.

[0107] (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.

[0108] (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.

[0109] (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.

[0110] In the above method, Z7, the first wire rope is connected to the left lifting lug, and the second hook is connected to the right lifting lug. In this embodiment, the crane is equipped with two trolleys; one trolley is connected to a set of lifting lug assemblies, and the other trolley is connected to another set of lifting lug assemblies.

[0111] In the above method, during the lifting of the boom, the crane is connected to the boom via a pulley. When the pulley lifts the boom, it first lifts the base section of the boom. 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, allowing the crane to perform the next action. During the lifting process, the boom switches between an inclined state and a horizontal state.

[0112] Meanwhile, when hoisting the boom, there may be situations where the length of a single wire rope is insufficient. In such cases, it is necessary to calculate the sliding distance of the wire rope on the pulley to determine the length of the wire rope.

[0113] 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.

[0114] 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.

[0115] In the above method, Z5 determines the center of gravity of the boom, specifically as follows:

[0116] S1. Obtain the weight T1 of the boom root segment and determine the center of gravity of the boom root segment.

[0117] Obtain the weight T2 of the middle section of the boom and determine the center of gravity of the middle section of the boom.

[0118] Obtain the weight T3 of the front section of the boom and determine the center of gravity of the front section of the boom.

[0119] Obtain the weight T4 of the main hook pulley frame and determine the center of gravity of the main hook pulley frame.

[0120] Obtain the weight T5 of the auxiliary hook pulley frame and determine its center of gravity.

[0121] Obtain the weight T6 of the stabilizing winch and determine the center of gravity of the stabilizing winch.

[0122] Obtain the weight T7 of the rigging winch and determine the center of gravity of the rigging winch.

[0123] Obtain the weight T8 of the boom walkway and determine the center of gravity of the boom walkway.

[0124] 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.

[0125] 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 ...

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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 assembling a crane, the crane comprising a base, a slewing platform, a tripod, and a boom, the boom being supported by a support frame, characterized in that: The crane assembly method includes the following steps: Z1. A first target point and a second target point are preset. The first target point is the installation position of the crane, and the second target point is the installation position of the support frame. The first target point is equipped with a base. Z2. The crane lifts the base to the first target point, and the base is connected to the base; Z3. The crane lifts the support frame to the second target point; Z4. The crane lifts the tripod to the first target point, and the tripod is connected to the rotary platform. Z5. Determine the center of gravity of the boom, and pre-set a set of lifting lug assemblies on both sides of the center of gravity of the boom, and pre-set the distance L1 between the left lifting lug Q and the right lifting lug W; Z6. Calculate the slip distance of the wire rope on the crane's trolley; Z7. The crane lifts the boom to the second target point and connects the boom root section to the slewing platform. After the boom root is connected to the slewing platform, proceed to Z8. Z8. The crane lowers the front section of the boom onto the resting platform; Z9. A swing wire rope is threaded between the boom and the tripod; in Z6, the sliding distance of the wire rope on the crane's trolley is calculated, including the following steps: (1). Preset the first positioning point J and the second positioning point P; the first positioning point J is the position where the trolley moves to the position directly above the left lifting lug Q, and the second positioning point P is the position where the trolley moves to the position directly above the right lifting lug W; (2). When the trolley reaches the first positioning point J, the distance between the left lifting lug Q and the trolley pulley is preset and a first auxiliary line QJ is set. The first auxiliary line QJ connects the left lifting lug Q and the trolley pulley. When the trolley reaches the first positioning point J, the distance between the right lifting lug W and the top of the first auxiliary line QJ is preset and a second auxiliary line WJ is set. The second auxiliary line WJ connects the right lifting lug W and the top of the first auxiliary line QJ. (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; (4). Set the 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. (5) Calculate the length of AE; (6) Connect the right lug W with point A using the diagonal line AW and calculate the length of the diagonal line AW; (7) Calculate the difference K1 between the length QA between the left lug Q and point A and the oblique line AW; (8) When the trolley reaches the second positioning point P, the distance between the right lifting lug W and the trolley pulley is preset and a fourth auxiliary line WP is set. The fourth auxiliary line WP connects the right lifting lug W and the trolley pulley. When the trolley reaches the second positioning point P, the distance between the left lifting lug Q 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 Q and the top of the fourth auxiliary line WP. (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; (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. (11). Calculate the length of the sixth auxiliary line BR; (12). Connect the left lug Q to point B with the diagonal line BQ and calculate the length of the diagonal line BQ; (13). Calculate the difference K2 between the length WB between the right lug W and point B and the oblique line BQ; (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.

2. The method for assembling a crane according to claim 1, characterized in that: 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 Z5, determining the boom's center of gravity includes the following steps: S1. Obtain the weight T1 of the boom root segment and determine the center of gravity of the boom root segment; Obtain the weight T2 of the middle section of the boom and determine the center of gravity of the middle section of the boom; Obtain the weight T3 of the front section of the boom and determine the center of gravity of the front section of the boom; Obtain the weight T4 of the main hook pulley frame and determine the center of gravity of the main hook pulley frame; Obtain the weight T5 of the auxiliary hook pulley frame and determine the center of gravity of the auxiliary hook pulley frame; Obtain the weight T6 of the stabilizing winch and determine the center of gravity of the stabilizing winch; Obtain the weight T7 of the rigging winch and determine the center of gravity of the rigging winch; Obtain the weight T8 of the boom walkway and determine the center of gravity of the boom walkway; 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; S3. Starting from the shaft hole of the boom root section, along the length of the boom, obtain the following distances: X1 between the center of gravity of the boom root section and the shaft hole; X2 between the center of gravity of the boom middle section and the shaft hole; X3 between the center of gravity of the boom front section and the shaft hole; X4 between the center of gravity of the main hook pulley frame and the shaft hole; X5 between the center of gravity of the auxiliary hook pulley frame and the shaft hole; X6 between the center of gravity of the stabilizing winch and the shaft hole; X7 between the center of gravity of the rigging winch and the shaft hole; and X8 between the center of gravity of the boom walkway and the shaft hole. S4. Using the formula Cn = Tn * Xn, where n is 1-8, calculate the torque C1 of the boom root section, the torque C2 of the boom middle section, the torque C3 of the boom front section, the torque C4 of the main hook pulley frame, the torque C5 of the auxiliary hook pulley frame, the torque C6 of the stabilizing winch, the torque C7 of the rigging winch, and the torque C8 of the boom walkway. 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. 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. 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.

3. The method for assembling a crane according to claim 1, characterized in that: Each lifting lug assembly includes a left lifting lug Q and a right lifting lug W arranged sequentially along the length of the boom from the front section to the root section of the boom; 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.

4. The method for assembling a crane according to claim 1, characterized in that: In step (5) of Z6, the length of the third auxiliary line AE is calculated by using the formula AE=EJ * tan QJW. In step (6) of Z6, 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 Z6, 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.

5. The method for assembling a crane according to claim 1, characterized in that: In step (11) of Z6, the sixth auxiliary line BR is calculated by using the formula BR = RP * tan QPW to calculate the length of the sixth auxiliary line BR. In step (12) of Z6, 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 Z6, WB is calculated by first using BP. 2 =RP 2 +BR 2 Calculate the length of BP, and then calculate the length of WB using WB=WP-BP.

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