A port mobile crane jib head structure and sheave arrangement

Abstract

The application discloses a port mobile crane boom head structure and pulley arrangement, which comprises high-strength seamless steel pipes, pulley support ear plates, first pulleys, second pulleys and pulley shafts; the truss boom body is horizontally arranged in a transverse direction, and high-strength seamless steel pipes are arranged in a horizontal and longitudinal direction at the head of the truss boom body; two pulley support ear plates are arranged on the left and right sides of the truss boom body respectively on the front side surface of the high-strength seamless steel pipes, and the two pulley support ear plates on the same side are symmetrically arranged at a specified width; a scissor hand-shaped opening is formed at the end of each pulley support, and a pulley shaft is horizontally and longitudinally connected in the opening of the two pulley support ear plates on the same side; a plurality of first pulleys are sequentially and spacedly connected on each pulley shaft between the two pulley support ear plates, and a second pulley is connected on the outer side of the corresponding pulley support ear plate on the side close to the truss boom body. The application reduces the weight of the boom head and the whole.

Description

Technical Field

[0001] This invention relates to the field of crane technology, specifically to a boom head structure and pulley arrangement for a port mobile crane. Background Technology

[0002] Mobile port cranes, a newly emerging type of multi-purpose, single-arm crane used for loading and unloading in China, encompass hook operation, container spreader operation, and grab bucket operation, suitable for loading and unloading general cargo, containers, and bulk cargo. When using a mechanical grab bucket as a lifting tool or with a large lifting capacity, the mobile port crane requires a double winch, four-rope, single-rate hoisting winch system in its hoisting mechanism design.

[0003] Currently, the boom head structure and pulley arrangement of traditional port cranes in China are basically the same as those used for single-boom gantry cranes. In fixed cranes, the single-boom head structure and pulley arrangement are all of the same type, with the pulley support structure being a double-ear plate. The pulleys are arranged side by side on the inner side of the ear plate. This makes the overall pulley block less stressed. The truss is connected to the flange hinge seat. When the stress is high, it is connected through the box beam. However, this design increases the weight of the boom head.

[0004] In addition, when the two hoisting winches connect the ropes from the boom head to the hook or mechanical grab bucket, both the sway angle of the outer wire rope and the sway angle of the inner wire rope must be considered. The outer rope pulley is mainly affected by factors such as the cross-section of the tower boom structure and the width of the hook. For large models, the outer pulley opening is generally around 3000mm. However, the opening and closing rope spacing of the mechanical grab bucket is generally designed to be less than 1000mm due to the diameter of the grab bucket pulley group, and the width of a set of pulleys is around 500mm. This arrangement requires consideration of both ends, increasing the design difficulty.

[0005] Therefore, the above problems urgently need to be solved. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a boom head structure and pulley arrangement for a mobile port crane. The boom head of the mobile port crane adopts a high-strength seamless steel pipe transition, which is simple in structure, more direct in force transmission, and reduces the weight of the boom head and the whole.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The innovation of the boom head structure and pulley arrangement of a port mobile crane of the present invention lies in: including a high-strength seamless steel pipe, pulley support ear plates, a first pulley, a second pulley, and a pulley shaft; the truss-type boom body is horizontally arranged, and a high-strength seamless steel pipe is also horizontally arranged longitudinally at its head; two pulley support ear plates are vertically arranged on the front surface of the high-strength seamless steel pipe on the left and right sides of the truss-type boom body, respectively, and the two sets of pulley support ear plates are symmetrical to the left and right sides of the truss-type boom body, and the two pulley support ear plates on the same side... The plates are symmetrically arranged at left and right intervals according to a specified width; each pulley bracket has a scissor-shaped opening that runs through its left and right sides embedded at its end, and pulley shafts are respectively horizontally and longitudinally engaged in the openings of the two pulley bracket ear plates on the same side. Several first pulleys are coaxially sleeved on each pulley shaft at intervals along its length relative to the two corresponding pulley bracket ear plates, and second pulleys are coaxially sleeved on it relative to the outer side of the corresponding pulley bracket ear plate on the side near the main body of the truss-type boom, thereby forming a cantilever structure to reduce the sway angle of the wire rope and the stress on the pulley shaft.

[0008] Preferably, the high-strength seamless steel pipe is arranged in the same plane as the truss boom body, and its rear surface is welded and fixed to the head of the truss boom body at the middle position, thereby reducing the weight of the boom head and the whole through the transition of the high-strength seamless steel pipe.

[0009] Preferably, the welding positions of the truss boom body and the high-strength seamless steel pipe do not interfere with the positioning and installation of each pulley bracket ear plate. Furthermore, several chords are staggered and inclined between the rear surface of the high-strength seamless steel pipe and the head of the truss boom body. The two ends of each chord are welded and fixed to the corresponding positions of the high-strength seamless steel pipe and the truss boom body, respectively, and do not interfere with the positioning and installation of each pulley bracket ear plate. Thus, the high-strength seamless steel pipe is reinforced and supported by the chords.

[0010] Preferably, each of the pulley bracket ear plates is vertically embedded at the root of a sleeve hole that penetrates its left and right sides, and each sleeve hole is matched with the diameter of the high-strength seamless steel pipe. After the pulley bracket ear plate is coaxially sleeved onto the high-strength seamless steel pipe through the sleeve hole and positioned, it is then welded and fixed to the high-strength seamless steel pipe.

[0011] Preferably, the opening direction of each pulley bracket ear plate is along the line connecting the boom hinge point and the pulley hinge point, and this line is parallel to the main support tube on the truss boom body, which is the force direction of the truss boom body.

[0012] Preferably, it further includes a first shaft end cover plate and a first spacer; a matching first shaft end cover plate is also provided coaxially on the end face of each pulley shaft away from the second pulley, and each first shaft end cover plate is screwed and fixed to the corresponding pulley bracket ear plate, so that the pulley shaft is fixed after being snapped with the corresponding pulley bracket ear plate; a first spacer is also coaxially sleeved on each pulley shaft relative to the adjacent first pulley and between the first pulley and the corresponding pulley bracket ear plate, so that the corresponding first pulley is axially positioned by the first spacer and the distance between adjacent first pulleys is adjusted by the first spacer.

[0013] Preferably, the spacing between adjacent first pulleys is determined based on the wire rope winding, the layout position of the hoisting winch, the length of the hoisting winch drum, and the spacing between the pulley blocks at the top of the tower. It is also necessary to ensure that the sway angle of the wire rope meets the standard requirements during the hoisting process from the highest point to the lowest point, and to ensure that the wire rope between the tower top and the boom does not interfere with the boom when it is slack.

[0014] Preferably, it further includes a second shaft end cover plate, a second spacer, an adjusting spacer, and a retaining ring; a retaining ring matching the scissor-shaped opening is coaxially sleeved on each pulley shaft relative to the second pulley and the corresponding pulley bracket ear plate, and each retaining ring is installed back-to-back with the corresponding pulley bracket ear plate, thereby increasing the side contact area of ​​the corresponding pulley bracket ear plate; an adjusting spacer is coaxially sleeved on each pulley shaft relative to the second pulley and the corresponding retaining ring, and the opening distance between the two second pulleys is adjusted by adjusting the spacer; a matching second shaft end cover plate is coaxially sleeved on the end face of each pulley shaft near the second pulley, and a second spacer is coaxially sleeved on it relative to the second pulley and the corresponding second shaft end cover plate, thereby axially positioning the corresponding second pulley.

[0015] Preferably, the length of each adjusting sleeve is determined based on the length of the corresponding pulley bracket ear plate portion extending from the pulley shaft, and its length must ensure that the opening distance between the two second pulleys matches the inner opening distance of the grab bucket, thereby reducing the wire rope outward deflection angle.

[0016] The beneficial effects of this invention are:

[0017] (1) The boom head of the mobile port crane of the present invention adopts a high-strength seamless steel pipe transition, which has a simple structure, more direct force transmission, and reduces the weight of the boom head and the whole.

[0018] (2) The present invention adopts a design in which three pulleys are arranged side by side and another pulley is installed on the outside of the ear plate of the pulley bracket, thereby forming a cantilever structure to reduce the sway angle of the wire rope and the stress on the pulley shaft;

[0019] (3) By opening a scissor-shaped opening, the present invention not only facilitates the installation and disassembly of the pulley shaft, but also reduces the weight of the boom head. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the boom head structure and pulley arrangement of a port mobile crane according to the present invention.

[0022] Figure 2 for Figure 1 Installation diagram of the ear plate part of the middle pulley bracket.

[0023] Figure 3 This is a schematic diagram of the pulley arrangement of the present invention.

[0024] Figure 4 This is a schematic diagram showing the required opening direction on the pulley bracket ear plate of the present invention.

[0025] Figure 5 This is a schematic diagram of the force on the wire rope of the single-sided pulley block of the present invention.

[0026] Figure 6 This is a schematic diagram of the force analysis of the present invention.

[0027] Among them, 1-truss-type boom main body; 2-high-strength seamless steel pipe; 3-pulley bracket ear plate; 4-first shaft end cover plate; 5-first pulley; 6-second pulley; 7-pulley shaft; 8-first spacer; 9-retaining ring; 10-adjusting spacer; 11-second spacer; 12-second shaft end cover plate; 13-chord. Detailed Implementation

[0028] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0029] The present invention discloses a boom head structure and pulley arrangement for a port mobile crane, comprising a high-strength seamless steel pipe 2, a pulley bracket ear plate 3, a first pulley 5, a second pulley 6, and a pulley shaft 7; as shown. Figures 1-3As shown, the truss boom body 1 is horizontally arranged, and a high-strength seamless steel pipe 2 is also horizontally arranged at its head. The high-strength seamless steel pipe 2 is arranged in the same plane as the truss boom body 1, and its rear surface is welded and fixed to the head of the truss boom body 1 at the middle position. The high-strength seamless steel pipe 2 is used to transition and reduce the weight of the boom head and the whole.

[0030] In this invention, two pulley bracket ear plates 3 are respectively provided vertically and horizontally on the front surface of the high-strength seamless steel pipe 2 on the left and right sides relative to the truss-type boom body 1, as shown in the figure. Figures 1-4 As shown, two sets of pulley bracket ear plates 3 are symmetrically arranged on the left and right sides of the truss-type boom body 1, and the two pulley bracket ear plates 3 on the same side are symmetrically arranged with a specified width between them. Each pulley bracket has a scissor-shaped opening extending through its left and right sides at its end, and each pulley bracket ear plate 3 has a vertically inserted socket hole extending through its left and right sides at its root. Each socket hole matches the diameter of the high-strength seamless steel pipe 2. After the pulley bracket ear plate 3 is coaxially fitted onto the high-strength seamless steel pipe 2 through the socket hole and positioned, it is then welded and fixed to the high-strength seamless steel pipe 2. The opening direction of each pulley bracket ear plate 3 is along the line connecting the boom hinge point and the pulley hinge point, and this line is parallel to the main support pipe on the truss-type boom body 1, representing the force direction of the truss-type boom body 1.

[0031] like Figure 1 , Figure 2 As shown, the welding positions of the truss boom body 1 and the high-strength seamless steel pipe 2 do not interfere with the positioning and installation of each pulley bracket ear plate 3. Furthermore, several chords 13 are staggered and inclined between the rear surface of the high-strength seamless steel pipe 2 and the head of the truss boom body 1. The two ends of each chord 13 are welded and fixed to the corresponding positions of the high-strength seamless steel pipe 2 and the truss boom body 1, respectively, and do not interfere with the positioning and installation of each pulley bracket ear plate 3. Thus, the high-strength seamless steel pipe 2 is reinforced and supported by the chords 13.

[0032] In this invention, pulley shafts 7 are horizontally and longitudinally engaged within the openings of the two pulley bracket ear plates 3 on the same side. Furthermore, several first pulleys 5 are coaxially and sequentially spaced along the length of each pulley shaft 7 relative to the corresponding two pulley bracket ear plates 3. A second pulley 6 is also coaxially and centrally engaged on the pulley shaft 7 relative to the outer side of the corresponding pulley bracket ear plate 3 on the side closest to the truss-type boom body 1, thus forming a cantilever structure to reduce the sway angle of the wire rope and the stress on the pulley shafts 7. Figures 1-3As shown, a matching first shaft end cover plate 4 is coaxially provided on the end face of each pulley shaft 7 away from the second pulley 6, and each first shaft end cover plate 4 is screwed and fixed to the corresponding pulley bracket ear plate 3. After the pulley shaft 7 is engaged with the corresponding pulley bracket ear plate 3, it is fixed. On each pulley shaft 7, a first spacer 8 is coaxially sleeved between adjacent first pulleys 5 and between the first pulley 5 and the corresponding pulley bracket ear plate 3. The first spacer 8 is used to axially position the corresponding first pulley 5 and adjust the distance between adjacent first pulleys 5. The distance between adjacent first pulleys 5 is determined according to the wire rope winding, the layout position of the hoisting winch, the length of the hoisting winch drum, and the opening distance of the pulley group at the top of the tower. It is necessary to ensure that the sway angle of the wire rope meets the standard requirements during the hoisting process from the highest point to the lowest point, and to ensure that the wire rope between the tower top and the boom does not interfere with the boom when slack.

[0033] like Figures 1-3 As shown, a retaining ring 9 matching the scissor-shaped opening is coaxially sleeved on each pulley shaft 7 between the second pulley 6 and the corresponding pulley bracket ear plate 3. Each retaining ring 9 is installed back-to-back with the corresponding pulley bracket ear plate 3, thereby increasing the side contact area of ​​the corresponding pulley bracket ear plate 3 and ensuring that the corresponding adjusting sleeve 10 does not fail when the second pulley 6 is subjected to lateral force. An adjusting sleeve 10 is also coaxially sleeved on each pulley shaft 7 between the second pulley 6 and the corresponding retaining ring 9, and the opening distance between the two second pulleys 6 is adjusted by adjusting the adjusting sleeve 10. A second shaft end cover plate 12 matching it is coaxially sleeved on the end face of each pulley shaft 7 near the second pulley 6, and a second sleeve 11 is coaxially sleeved on it between the second pulley 6 and the corresponding second shaft end cover plate 12, thereby axially positioning the corresponding second pulley 6. The length of each adjusting sleeve 10 is determined based on the length of the corresponding pulley bracket ear plate 3 extending from the pulley shaft 7, and its length must ensure that the opening distance between the two second pulleys 6 matches the inner opening distance of the grab bucket, thereby reducing the outward swing angle of the wire rope.

[0034] like Figure 5 , Figure 6 As shown, the force analysis of a single-sided pulley system is as follows:

[0035] In a double winch single-rate four-out rope system, the force on a single wire rope is F=G / 4;

[0036] Where G is the weight of the hoisted goods, and the maximum hoisting weight is considered here;

[0037] The two pulleys in the middle of the pulley block are the ones with the greatest force. The steel wire rope is wound at 180° and the force is in the same direction. The maximum lateral force of a single pulley block is the bearing lateral force F_bearing = 2F.

[0038] Specifically: when the maximum lifting capacity of the mobile port crane is 150t and the weight is 1500KN, considering the maximum lifting dynamic load coefficient G = 1500 × 1.25 = 1875KN; the maximum dynamic lateral force F of the pulley block bearing... 轴承 =2F=2×G / 4=937.5KN. According to the selection standard for cylindrical roller bearings for pulleys, bearing models 5372148 / 5372152 both meet the requirements. When the pulley shaft diameter is selected as φ240mm, the maximum stress after being subjected to force is 131.854 MPa, which is significantly reduced and meets the usage requirements.

[0039] Furthermore, by selecting bearing model 5372148 for the φ240 diameter pulley shaft, the weight of a single pulley bearing is reduced by 31.2 kg. With a total of eight pulleys at the boom head, the total weight reduction is approximately 250 kg, a significant reduction. Moreover, the weight reduction is achieved through design modifications such as narrowing the bearing and pulley widths, the weight of the pins, and the weight of the shaft end caps; these are not listed here. The luffing cylinder pulling force can also be reduced by 2-3 tons, and the overall machine counterweight can also be reduced. Therefore, the overall machine performance parameters are significantly improved.

[0040] The beneficial effects of this invention are:

[0041] (1) The boom head of the mobile port crane of the present invention adopts a high-strength seamless steel pipe 2 for transition, which has a simple structure, more direct force transmission, and reduces the weight of the boom head and the whole.

[0042] (2) The present invention adopts a design in which three pulleys are arranged side by side and another pulley is installed on the outside of the pulley bracket ear plate 3, thereby forming a cantilever structure to reduce the sway angle of the wire rope and the stress on the pulley shaft 7;

[0043] (3) By opening a scissor-shaped opening, the present invention not only facilitates the installation and disassembly of the pulley shaft 7, but also reduces the weight of the boom head.

[0044] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. A boom head structure and pulley arrangement for a port mobile crane, characterized in that: The system includes a high-strength seamless steel pipe, pulley bracket ear plates, a first pulley, a second pulley, and a pulley axle. The truss-type boom body is horizontally arranged, and a high-strength seamless steel pipe is also horizontally arranged longitudinally at its head. Two pulley bracket ear plates are vertically and horizontally arranged on the front surface of the high-strength seamless steel pipe on the left and right sides relative to the truss-type boom body. The two sets of pulley bracket ear plates are symmetrical about the truss-type boom body, and the two pulley bracket ear plates on the same side are symmetrically arranged with a specified width of left-right interval. At the end of each pulley bracket… It also has scissor-shaped openings that run through its left and right sides, and pulley shafts are respectively horizontally and longitudinally engaged in the openings of the two pulley bracket ear plates on the same side. Several first pulleys are coaxially sleeved on each pulley shaft at intervals along its length relative to the two corresponding pulley bracket ear plates, and second pulleys are coaxially sleeved on it relative to the outer side of the corresponding pulley bracket ear plate on the side of the truss boom body, thereby forming a cantilever structure to reduce the sway angle of the wire rope and the stress on the pulley shaft.

2. The boom head structure and pulley arrangement of a port mobile crane according to claim 1, characterized in that: The high-strength seamless steel pipe is set in the same plane as the truss boom body, and its rear surface is welded and fixed to the head of the truss boom body at the middle position. The high-strength seamless steel pipe is used as a transition to reduce the weight of the boom head and the overall weight.

3. The boom head structure and pulley arrangement of a port mobile crane according to claim 2, characterized in that: The welding positions of the truss-type boom body and the high-strength seamless steel pipe do not interfere with the positioning and installation of each pulley bracket ear plate. Furthermore, several chords are staggered and inclined between the rear surface of the high-strength seamless steel pipe and the head of the truss-type boom body. The two ends of each chord are welded and fixed to the corresponding positions of the high-strength seamless steel pipe and the truss-type boom body, respectively, and do not interfere with the positioning and installation of each pulley bracket ear plate. Thus, the high-strength seamless steel pipe is reinforced and supported by the chords.

4. The boom head structure and pulley arrangement of a port mobile crane according to claim 1, characterized in that: At the root of each pulley bracket ear plate, a sleeve hole is vertically embedded through its left and right sides, and each sleeve hole is matched with the diameter of the high-strength seamless steel pipe. After the pulley bracket ear plate is coaxially sleeved on the high-strength seamless steel pipe through the sleeve hole and positioned, it is then welded and fixed to the high-strength seamless steel pipe.

5. The boom head structure and pulley arrangement of a port mobile crane according to claim 1, characterized in that: The opening direction of each pulley bracket ear plate is along the line connecting the boom hinge point and the pulley hinge point, and this line is parallel to the main support tube on the truss boom body, which is the force direction of the truss boom body.

6. The boom head structure and pulley arrangement of a port mobile crane according to claim 1, characterized in that: It also includes a first shaft end cover plate and a first spacer; a matching first shaft end cover plate is also provided coaxially on the end face of each pulley shaft away from the second pulley, and each first shaft end cover plate is screwed and fixed to the corresponding pulley bracket ear plate, so that the pulley shaft is fixed after being snapped with the corresponding pulley bracket ear plate; a first spacer is also coaxially sleeved on each pulley shaft relative to the adjacent first pulley and between the first pulley and the corresponding pulley bracket ear plate, so that the corresponding first pulley is axially positioned by the first spacer and the distance between adjacent first pulleys is adjusted by the first spacer.

7. The boom head structure and pulley arrangement of a port mobile crane according to claim 6, characterized in that: The spacing between adjacent first pulleys is determined based on the wire rope winding, the layout position of the hoisting winch, the length of the hoisting winch drum, and the spacing between the pulley blocks at the top of the tower. It is also necessary to ensure that the sway angle of the wire rope meets the standard requirements during the hoisting process from the highest point to the lowest point, and to ensure that the wire rope between the tower top and the boom does not interfere with the boom when it is slack.

8. The boom head structure and pulley arrangement of a port mobile crane according to claim 1, characterized in that: It also includes a second shaft end cover plate, a second spacer, an adjusting spacer, and a retaining ring; a retaining ring matching the scissor-shaped opening is coaxially sleeved on each pulley shaft relative to the second pulley and the corresponding pulley bracket ear plate, and each retaining ring is installed back-to-back with the corresponding pulley bracket ear plate, thereby increasing the side contact area of ​​the corresponding pulley bracket ear plate; an adjusting spacer is coaxially sleeved on each pulley shaft relative to the second pulley and the corresponding retaining ring, and the opening distance between the two second pulleys is adjusted by adjusting the spacer; a matching second shaft end cover plate is coaxially sleeved on the end face of each pulley shaft near the second pulley, and a second spacer is coaxially sleeved on it relative to the second pulley and the corresponding second shaft end cover plate, thereby axially positioning the corresponding second pulley.

9. The boom head structure and pulley arrangement of a port mobile crane according to claim 8, characterized in that: The length of each adjusting sleeve is determined based on the length of the corresponding pulley bracket ear plate extending from the pulley shaft, and its length must ensure that the opening distance between the two second pulleys matches the inner opening distance of the grab bucket, thereby reducing the wire rope outward deflection angle.

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