A method of determining the slip length of a steel wire rope

Abstract

The application provides a method for determining the sliding length of a steel wire rope, a first positioning point is arranged at the left limit positioning point of the displacement of a pulley, a second positioning point is arranged at the right limit positioning point of the displacement of the pulley; the sliding length of the steel wire rope is calculated at the first positioning point and the second positioning point respectively, and then the maximum sliding length of the steel wire rope is determined, so that the maximum sliding length of the steel wire rope can meet the movement of the pulley between the left limit positioning point and the right limit positioning point.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hoisting equipment, in particular to a method for determining the sliding length of a steel wire rope. BACKGROUND

[0002] The trolley is used for hoisting objects, and a steel wire rope is wound around the pulley of the trolley to lift the object by changing the direction of the steel wire rope to hoist or move the object. The steel wire rope is integrally arranged on the existing trolley, so that the trolley cannot be connected to the object when the length of the steel wire rope is insufficient. Meanwhile, when two or more steel wire ropes are connected for use, the sliding length of the steel wire rope needs to be calculated to avoid interference between the connection of the connected steel wire ropes and the pulley. Meanwhile, during the hoisting process of the boom, the front end of the boom is connected to the trolley after the boom is connected to the slewing platform of the crane, so as to realize the whole hoisting of the boom off the ground. SUMMARY

[0003] The present application provides a method for determining the sliding length of a steel wire rope, which calculates the sliding length of the steel wire rope to determine the length of the steel wire rope and avoid interference between the connection of the connected steel wire ropes and the pulley.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: a method for determining the sliding length of a steel wire rope, comprising the following steps:

[0005] (1) presetting a first positioning point J and a second positioning point P, a left lifting lug Q and a right lifting lug W arranged along the length direction of the boom, and a distance L1 between the left lifting lug Q and the right lifting lug W; the first positioning point is the position where the trolley moves above the left lifting lug Q, and the second positioning point is the position where the trolley moves above the right lifting lug W.

[0006] (2) presetting the distance between the left lifting lug Q and the pulley of the trolley when the trolley reaches the first positioning point and setting a first auxiliary line QJ connecting the left lifting lug and the pulley of the trolley, and presetting 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 and setting a second auxiliary line WJ connecting the right lifting lug and the top of the first auxiliary line QJ.

[0007] (3) calculating the angle of the included angle ∠QJW between the first auxiliary line QJ and the second auxiliary line WJ by the formula cos ∠QJW = (WJ 2 + QJ 2 - L1 2 ) / (2 * WJ * QJ).

[0008] (4) setting a third auxiliary line AE, which 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.

[0009] (5) Calculate the length of AE.

[0010] (6) Connect the right side lifting lug with A point through diagonal AW and calculate the length of diagonal AW;

[0011] (7) Calculate the difference K1 between the length QA between the left side lifting lug and A point and diagonal AW.

[0012] (8) Set the distance between the right side lifting lug and the pulley of the trolley when the trolley reaches the second positioning point and set the fourth auxiliary line WP, the fourth auxiliary line WP connects the right side lifting lug with the pulley of the trolley; set the distance between the left side lifting lug and the top of the fourth auxiliary line WP when the trolley reaches the second positioning point and set the fifth auxiliary line QP, the fifth auxiliary line QP connects the left side lifting lug with the top of the fourth auxiliary line WP.

[0013] (9) Calculate the angle of the included angle QPW between the fourth auxiliary line WP and the fifth auxiliary line QP through the formula cos∠QPW= (WP 2 + QP 2 - L1 2 ) / (2 * WP * QP).

[0014] (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 intersects with the fourth auxiliary line WP, and the intersection point of the sixth auxiliary line BR and the fourth auxiliary line WP is B point.

[0015] (11) Calculate the length of diagonal BR.

[0016] (12) Connect the left side lifting lug with B point through diagonal BQ and calculate the length of diagonal BQ.

[0017] (13) Calculate the difference K2 between the length WB between the right side lifting lug and B point and diagonal BQ.

[0018] (14) Determine the size of K2 and K1; if K2 is greater than K1, set K2 as the sliding distance of the steel wire rope, if K1 is greater than K2, set K1 as the sliding distance of the steel wire rope.

[0019] The above method, when hoisting the boom, the crane is connected with the boom through the trolley, when the trolley hoists the boom, the tail of the boom is hoisted first, after the boom tail section and the rotary platform are preliminarily connected, then the trolley lowers the head of the boom to the rest frame, so that the boom is away from the ground as a whole under the condition that the crane is insufficient, and then the crane can perform the next action. During hoisting, the boom switches between the inclined state and the horizontal state.

[0020] In the horizontal state, the length of the wire rope connected with the left side lifting lug through the pulley is the same as the length of the wire rope connected with the right side lifting lug through the pulley; in the inclined state, the length of the wire rope connected with the left side lifting lug through the pulley will change when the pulley drives the boom to swing, and the sliding length of the wire rope is calculated by the difference between the length of the wire rope connected with the left side lifting lug through the pulley and the length of the wire rope connected with the right side lifting lug through the pulley.

[0021] However, when the trolley moves, the position of the trolley will change, and the sliding length of the wire rope will also change when the trolley moves between the left limit positioning point and the right limit positioning point; on this basis, a first positioning point J is preset, the first positioning point J is the positioning point of the left limit of the trolley, and 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, the second positioning point P is the positioning point of the trolley moving to the right limit, and the sliding length of the wire rope when the trolley reaches the right limit is calculated by setting the second positioning point P; then the maximum sliding length of the wire rope is calculated by comparing the sliding lengths of the wire rope at the first positioning point J and the second positioning point P, and the maximum sliding length of the wire rope is calculated to meet the movement of the trolley between the left limit positioning point and the right limit positioning point.

[0022] Further, in step (5), the length of the diagonal line AE is calculated by the formula AE = EJ*tan QJW.

[0023] Further, in step (6), the length of the diagonal line AW is calculated by the formula AW 2 = WE 2 + AE 2 .

[0024] Further, in step (7), the calculation method of QA is that the length of AJ is calculated by AJ 2 =EJ 2 + AE 2 , and then the length of QA is calculated by QA=QJ-AJ.

[0025] Further, in step (11), the calculation method of the diagonal line BR is that the length of the diagonal line BR is calculated by the formula BR= RP*tan QPW.

[0026] Further, in step (12), the length of the diagonal line BQ is calculated by the formula BQ 2 = QR 2 + BR 2 .

[0027] Furthermore, in step (13), the calculation method of WB is to first pass BP 2 =RP 2 + BR 2 , calculate the length of BP, and then calculate the length of WB through WB=WP-BP. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the pulley reaching the first positioning point in the present invention.

[0029] Figure 2 This is a schematic diagram of the pulley reaching the second positioning point in the present invention.

[0030] Figure 3 Schematic diagram of the pulley.

[0031] Figure 4 Schematic diagram of the wire rope group. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1-4 As shown, a pulley is used for connecting a crane (not shown in the figure) and a boom 3 and for lifting the boom 3; the pulley includes a pulley device 1 and a wire rope group 2, and the pulley assembly includes a pulley 11, a first backing plate 12 and a second backing plate 13; the first backing plate 12 and the second backing plate 13 are connected to form a cavity (not shown in the figure), and a connecting shaft 15 connecting the first backing plate 12 and the second backing plate 13 is provided in the cavity, and the pulley 11 is rotatably arranged in the connecting shaft 15.

[0034] The ends of the first retaining plate 12 and the second retaining plate 13 away from the pulley are used to be connected to the crane.

[0035] The wire rope group 2 includes a first wire rope 21, a second wire rope 22 and a third wire rope 23. The second wire rope 22 is arranged on the pulley 11. Both ends of the second wire rope 22 extend out of the cavity. 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 end of the first wire rope 21 and the other end of the third wire rope 23 are used to be connected to an object.

[0036] By setting a detachably connected first steel rope 21, a second steel rope 22 and a third steel rope 23; when the length of the second steel rope 22 is insufficient, the length of the steel rope group 2 is extended by connecting it with the first steel rope 21 and the third steel rope 23; so that the steel rope group 2 can connect the pulley device 1 with the object.

[0037] The second steel wire rope 22 is provided with an unloading buckle 24 at each end, the first steel wire rope 21 is connected with a first hook (not shown in the figure) at each end, and the third steel wire rope 23 is connected with a second hook (not shown in the figure) at each end; the first steel wire rope 21 is detachably connected with the unloading buckle 24 and the object through the first hook, and the third steel wire rope 23 is detachably connected with the unloading buckle 24 and the object through the second hook.

[0038] In the embodiment, the width of the cavity is smaller than the width A2 of the unloading buckle 24. Since the width of the cavity is smaller than the width of the unloading buckle 24, the unloading buckle 24 can be blocked outside the cavity, and the structure is simple. The first stop plate 12 and the second stop plate limit the position of the unloading buckle 22, so that the unloading buckle 22 cannot enter the cavity and collide with the pulley 11, thereby protecting the pulley 11.

[0039] The left lifting lug Q and the right lifting lug W are arranged along the length direction of the lifting arm, the first hook is connected with the left lifting lug Q, and the second hook is connected with the right lifting lug W. In the embodiment, the length of the second steel wire rope 22 is greater than the lengths of the first steel wire rope 21 and the third steel wire rope 23. The second steel wire rope 22 with a longer length is arranged, so that the second steel wire rope 22 can move on the pulley 11.

[0040] The method for determining the sliding length of the second steel wire rope comprises the following steps.

[0041] (1) The first positioning point J and the second positioning point P, the left lifting lug Q and the right lifting lug W arranged along the length direction of the lifting arm, and the distance L1 between the left lifting lug Q and the right lifting lug W are preset; the first positioning point is the position where the trolley moves directly above the left lifting lug Q, and the second positioning point is the position where the trolley moves directly above the right lifting lug W.

[0042] (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 arranged, the first auxiliary line QJ connecting 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 arranged, the second auxiliary line WJ connecting the right lifting lug and the top of the first auxiliary line QJ.

[0043] (3) The 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).

[0044] (4) A third auxiliary line AE is arranged, the third auxiliary line AE being a vertical line passing through the midpoint E of the second auxiliary line WJ and intersecting the first auxiliary line QJ, and the intersection point of the third auxiliary line AE and the first auxiliary line QJ being point A.

[0045] (5) Calculate the length of AE. Specifically, the length of the diagonal AE is calculated by the formula AE = EJ * tan QJW.

[0046] (6) Connect the right side lifting lug with point A by diagonal AW and calculate the length of diagonal AW. Specifically, the length of diagonal AW is calculated by the formula AW = WE + AE. 2 2 2

[0047] (7) Calculate the difference K1 between the length QA between the left side lifting lug and point A and diagonal AW. Specifically, the length of QA is calculated by first calculating the length of AJ by AJ = EJ + AE, and then calculating the length of QA by QA = QJ - AJ. 2 2 2

[0048] (8) When the pulley reaches the second positioning point, the distance between the right side lifting lug and the pulley sheave is preset and a fourth auxiliary line WP is set, which connects the right side lifting lug with the pulley sheave. When the pulley reaches the second positioning point, the distance between the left side lifting lug and the top of the fourth auxiliary line WP is preset and a fifth auxiliary line QP is set, which connects the left side lifting lug with the top of the fourth auxiliary line WP.

[0049] (9) Calculate the angle ∠QPW between the fourth auxiliary line WP and the fifth auxiliary line QP by the formula cos ∠QPW = (WP + QP - L1) / (2 * WP * QP). 2 2 2

[0050] (10) Set a sixth auxiliary line BR, which is a perpendicular 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.

[0051] (11) Calculate the length of diagonal BR. Specifically, the length of diagonal BR is calculated by the formula BR = RP * tan QPW.

[0052] (12) Connect the left side lifting lug with point B by diagonal BQ and calculate the length of diagonal BQ. Specifically, the length of diagonal BQ is calculated by the formula BQ = QR + BR. 2 2 2

[0053] ​​​​​​​​​​​​(13) Calculate the difference K2 between the length WB between the right side lifting lug and B point and the diagonal line BQ. Specifically, the calculation method of WB is to first calculate the length of BP by 2 = RP 2 + BR 2 , and then calculate the length of WB by WB = WP - BP.

[0054] (14) Determine the size of K2 and K1; if K2 is greater than K1, set K2 as the sliding distance of the steel wire rope, and if K1 is greater than K2, set K1 as the maximum sliding distance of the steel wire rope.

[0055] The above method, when hoisting the jib, the motor is connected with the jib through the trolley, and when the trolley lifts the jib, the tail of the jib is lifted first, and then the head of the jib is lowered onto the rest rack after the jib tail section and the rotary platform are preliminarily connected, so that the jib is moved away from the ground as a whole under the condition that the crane is insufficient, and then the crane can perform the next action. During hoisting, the jib will switch between an inclined state and a horizontal state.

[0056] In the horizontal state, the length of the steel wire rope connected to the left side lifting lug through the pulley is the same as the length of the steel wire rope connected to the right side lifting lug through the pulley; in the inclined state, when the pulley drives the jib to swing, the length of the steel wire rope connected to the left side lifting lug through the pulley and the length of the steel wire rope connected to the right side lifting lug through the pulley will change, and the sliding length of the steel wire rope is calculated by the difference between the length of the steel wire rope connected to the left side lifting lug through the pulley and the length of the steel wire rope connected to the right side lifting lug through the pulley.

[0057] However, when the trolley moves, the position of the trolley will change, and the sliding length of the steel wire rope will also change when the trolley moves between the left and right limit positioning points; on this basis, a first positioning point J is preset, which is the left limit positioning point of the trolley, and the sliding length of the steel 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 when the trolley moves to the right limit, and the sliding length of the steel wire rope when the trolley reaches the right limit is calculated by setting the second positioning point P; then the maximum sliding length of the steel wire rope is calculated by comparing the sliding lengths of the steel wire rope at the first and second positioning points J and P, and the maximum sliding length of the steel wire rope is calculated to satisfy the movement of the trolley between the left and right limit positioning points.

[0058] The above method determines the maximum sliding distance K1 of the steel wire rope, and then determines the length of the second steel wire rope; when the sliding distance of the second steel wire rope is greater than or equal to K1, the second steel wire rope can move on the pulley without interference.

Claims

1. A method for determining the sliding length of a wire rope, characterized in that: The following steps are involved: (1) Preset the first positioning point J and the second positioning point P, the left lifting eye Q and the right lifting eye W set along the length of the boom, and the distance L1 between the left lifting eye Q and the right lifting eye W; the first positioning point is the position where the pulley moves to the position directly above the left lifting eye Q, and the second positioning point is the position where the pulley moves to the position directly above the right lifting eye W; (2) When the pulley reaches the first positioning point, the distance between the left lifting eye Q and the pulley sheave is preset and a first auxiliary line QJ is set, which connects the left lifting eye and the pulley sheave. When the pulley reaches the first positioning point, the distance between the right lifting eye W and the top of the first auxiliary line QJ is preset and a second auxiliary line WJ is set, which connects the right lifting eye and the top of the first auxiliary line QJ. (3). Through 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 a third auxiliary line AE, which is a perpendicular line passing through the midpoint E of the second auxiliary line WJ and intersects with the first auxiliary line QJ. The intersection 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 lifting lug and point A through 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 lifting ear and point A and the diagonal line AW; (8) When the pulley reaches the second positioning point, the distance between the right lifting eye and the pulley pulley is preset and the fourth auxiliary line WP is set, which connects the right lifting eye and the pulley pulley; when the pulley reaches the second positioning point, the distance between the left lifting eye and the top of the fourth auxiliary line WP is preset and the fifth auxiliary line QP is set, which connects the left lifting eye and the top of the fourth auxiliary line WP; (9). Through 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 a 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 with the fourth auxiliary line WP. The intersection of the sixth auxiliary line BR and the fourth auxiliary line WP is point B. (11). Calculate the length of the diagonal line BR; (12) Connect the left hanging ear and point B through 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 lifting ear and point B and the diagonal line BQ; (14). Determine the size of K2 and K1; If K2 is greater than K1, K2 is set as the sliding distance of the wire rope; if K1 is greater than K2, K1 is set as the sliding distance of the wire rope.

2. A method for determining the sliding length of a wire rope according to claim 1, characterized in that: In step (5), the length of the diagonal line AE is calculated by using the formula AE=EJ*tan QJW.

3. The method for determining the sliding length of a steel wire rope according to claim 2, wherein: In step (6), the length of the slash line AW is calculated by the formula AW 2 =WE 2 + AE 2 , calculate the length of the diagonal line AW.

4. The method for determining the sliding length of a steel wire rope according to claim 2, wherein: In step (7), the calculation method of QA is to first calculate the QA by AJ 2 =EJ 2 + AE 2 , calculate the length of AJ, and then calculate the length of QA through QA=QJ-AJ.

5. The method for determining the sliding length of a steel wire rope according to claim 1, wherein: In step (11), the calculation method of the diagonal line BR is to calculate the length of the diagonal line BR using the formula BR = RP* tan QPW.

6. The method for determining the sliding length of a steel wire rope according to claim 5, wherein: In step (12), the length of the diagonal line BQ is calculated by the formula BQ 2 =QR 2 + BR 2 , calculate the length of the diagonal line BQ.

7. The method for determining the sliding length of a steel wire rope according to claim 5, wherein: In step (13), the calculation method of WB is to first calculate the BP 2 =RP 2 + BR 2 , calculate the length of BP, and then calculate the length of WB through WB=WP-BP.

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