Portal crane with auxiliary hinge point shaft system and hinge point maintenance method

Abstract

The present application discloses a portal crane with an auxiliary hinge axis system and a hinge maintenance method. The crane includes a seat frame and a suspension system. The suspension system includes a large pull rod, a boom and an elephant trunk. One end of the large pull rod and one end of the boom are respectively hinged to the seat frame, and the other end of the large pull rod and the other end of the boom are respectively hinged to the elephant trunk. A first capstan is provided on the side of the boom away from the large pull rod, and a second capstan is provided on the side wall of the elephant trunk. When the suspension system is adjusted to the minimum amplitude state, the connection parts of the first capstan and the second capstan coincide. The minimum amplitude state is the state when the angle between the side of the boom away from the large pull rod and the elephant trunk is at the minimum angle. The hinge position of the large pull rod and the elephant trunk, the hinge position of the boom and the elephant trunk, and the installation position of the first capstan and the second capstan are respectively installed with maintenance platforms. In the maintenance process of the present application, the suspension system does not need to adjust the amplitude and is in a fixed state throughout the whole process, which is highly safe and efficient.

Description

Technical Field

[0001] The present application relates to the technical field of maintenance of portal cranes, and in particular to a portal crane with an auxiliary hinge point shaft system and a hinge point maintenance method. Background Art

[0002] The boom system of a portal crane, as the main steel structure of the portal crane, will perform luffing motion after the hook lifts the goods, and it works with load frequently. Therefore, the bearings at the boom hinge points need to be replaced and maintained regularly. Due to the excessive height of the boom hinge points, the site is limited, the operation difficulty for maintenance personnel is large, the risk is high, and there are also high requirements for the supporting lifting equipment for maintenance.

[0003] Such as Figure 1 , taking a 25-ton portal crane as an example, the boom hinge points 1 and 2 are about 43 meters and 41 meters from the ground track respectively; the difficulty of working at height is high. When removing the bearings, other lifting equipment is needed to assist and stabilize the large tie rod and the elephant trunk beam.

[0004] The existing maintenance plan: the boom of the portal crane needs to be adjusted to a large amplitude, and the rack safety shaft (such as Figure 2 ) and the balance live counterweight ensure the boom position and fix it. As shown in Figure 3 , the head of the large tie rod and the head of the elephant trunk beam are respectively stabilized by a wire rope through a lifting device to ensure that the large tie rod and the elephant trunk beam do not deflect after removing the hinge point 1 or hinge point 2. The operator removes the pin shaft of the hinge point 1 or hinge point 2 on the maintenance platform and replaces the bearing.

[0005] Since the existing replacement method of the boom hinge point is to use a wire rope of a lifting device at the head of the large tie rod and the head of the elephant trunk beam to stabilize the component and prevent deflection. As a flexible connection method, the wire rope cannot effectively ensure the shaking that occurs during the process of removing the pin shaft at the hinge point connection; it cannot ensure the stability of the maintenance platform and the safety of the maintenance worker. During the maintenance process of the hinge point, due to the height of the boom hinge point, there are also high requirements for the lifting height of the auxiliary lifting equipment, increasing the maintenance cost of the equipment. The entire replacement process is time-consuming and laborious, and at the same time, it poses high requirements for the operating ability of the auxiliary lifting equipment operator. Summary of the Invention

[0006] The present application provides a portal crane with an auxiliary hinge point shaft system and a hinge point maintenance method, which can solve a series of problems such as the need to use a wire rope to stabilize the elephant trunk beam and the large tie rod when replacing the bearing, and prevent collisions, squeezes, and damage to the paint of the structural members at the hinge point during the process; at the same time, the use of auxiliary lifting equipment is cancelled, reducing the cost; the entire disassembly and replacement process reduces the difficulty of on-site scheduling and prevents occupying more berths at the wharf.

[0007] The present application provides a portal crane with an auxiliary hinge shaft system and a hinge maintenance method using the following technical solutions:

[0008] First aspect

[0009] A portal crane with an auxiliary hinge axis system comprises a seat frame and a suspension system installed on the seat frame, wherein the suspension system comprises a large pull rod, a boom and an elephant trunk beam, one end of the large pull rod and one end of the boom are respectively hinged to the seat frame, and the other end of the large pull rod and the other end of the boom are respectively hinged to the elephant trunk beam;

[0010] A first capstan is provided on the side of the arm away from the large pull rod, and a second capstan is provided on the side wall of the trunk bridge. When the suspension system is adjusted to a minimum amplitude state, the connection parts of the first capstan and the second capstan coincide with each other. The minimum amplitude state is a state where the angle between the side of the arm away from the large pull rod and the trunk bridge is at a minimum angle.

[0011] Among them, maintenance platforms are respectively installed at the hinge point of the large pull rod and the elephant trunk beam, the hinge point of the arm and the elephant trunk beam, and the installation positions of the first capstan and the second capstan. When the suspension system is in the minimum amplitude state, the maintenance platform is in a horizontal state.

[0012] By adopting the above technical solution, the first capstan and the second capstan are pre-fixed on the suspension system, which does not affect the normal operation of the suspension system at all. When maintenance is required, the suspension system only needs to be adjusted to the minimum amplitude state. After the personnel fix the first capstan and the second capstan on the maintenance platform, the hinge point can be repaired. During the maintenance process, the suspension system does not need to adjust the amplitude and is in a fixed state throughout the process to prevent interference between the suspension system structural parts during maintenance and damage to the suspension system structural parts and paint surface. At the same time, there will be no obvious shaking during the maintenance process, which is highly safe. There is no need to use lifting equipment to hoist the suspension system during the maintenance process. The maintenance personnel only need to enter the maintenance platform for maintenance, which has high maintenance efficiency. The whole system has a simple structure and is easy to use, which can effectively save costs.

[0013] Optionally, the suspension system also includes a balance beam and a small pull rod, a counterweight is installed at one end of the balance beam, the other end of the balance beam is hinged to one end of the small pull rod, and the other end of the small pull rod is hinged to the arm. When the suspension system is in the minimum amplitude state, the counterweight is below the hinge point between the balance beam and the seat frame.

[0014] By adopting the above technical solution, the entire crane is in a low center of gravity state, and repairs can be carried out in this state, making the maintenance process safer and more reliable.

[0015] Optionally, a first ladder is installed on the large tie rod and the boom, and the first ladder is docked with the maintenance platform.

[0016] By adopting the above technical solution, the ladder is fixed to the large tie rod and the boom for a long time. When the hinge point needs to be maintained, personnel can directly enter the maintenance platform through the ladder to repair the hinge point. This solution improves the convenience of maintenance.

[0017] Optionally, a second ladder is installed on the elephant trunk beam. When the suspension system is adjusted to the minimum amplitude state, the second ladder is docked with the maintenance platform.

[0018] By adopting the above technical solution, that is, maintenance personnel can quickly transfer between the maintenance platforms between the hinge points in the air, thereby improving the repair efficiency of the hinge points, enabling the repair of the hinge points to be completed within half a day or a few hours, and greatly improving the repair efficiency of the hinge points.

[0019] Optionally, the first hinge seat includes a first web plate and a first pound plate. The first web plate is fixedly connected to the boom, and the first pound plate is fixed on the side of the first web plate away from the boom. The second hinge seat includes a second web plate and a second pound plate. The second web plate is fixedly connected to the elephant trunk beam, and the second pound plate is fixed on the side of the second pound plate away from the elephant trunk beam. Both the first pound plate and the second pound plate are provided with connection holes for the pin shaft to pass through.

[0020] By adopting the above technical solution, the layout form is simple, the parts are easy to manufacture, it is convenient for modularization, and the practicability is strong.

[0021] Optionally, at least two first pound plates and second pound plates are provided to form a first U-shaped structure between the first hinge seat and the boom, and a second U-shaped structure between the second hinge seat and the elephant trunk beam.

[0022] By adopting the above technical solution, it can ensure that the first hinge seat and the second hinge seat can be effectively docked when the suspension system is in the minimum amplitude state, enabling them to better cooperate with the pin shaft for connection. At the same time, the design of the U-shaped structure also enhances the structural stability and load-bearing capacity.

[0023] Optionally, the portal crane further includes a luffing mechanism. The luffing mechanism includes a rack and a luffing gearbox. One end of the rack is hinged to the boom, the rack is in transmission connection with the luffing gearbox, and the rack is provided with an insurance hole for the insurance shaft to pass through.

[0024] By adopting the above technical solution, an insurance shaft is inserted into the insurance hole to further stabilize the boom by the rack. Since the suspension system is in the minimum amplitude state, the pulling force of the rack on the boom is the smallest at this time, so the force on the insurance shaft is the smallest, which can better ensure the safety of the suspension system during the maintenance state.

[0025] The second aspect

[0026] A method for maintaining the hinge points of a portal crane, comprising the following steps:

[0027] Adjust the suspension system to the minimum amplitude state;

[0028] Connect the first hinge seat and the second hinge seat on the maintenance platform by using a pin shaft;

[0029] Maintain the hinge points of the big pull rod and the elephant trunk beam and the hinge points of the boom and the elephant trunk beam respectively. Among them, only the hinge points of the big pull rod and the elephant trunk beam or the hinge points of the boom and the elephant trunk beam can be maintained at the same time.

[0030] By adopting the above technical solution, the maintenance of the hinge points can be completed without using too many devices or personnel. The maintenance is fast and convenient, and can greatly improve the efficiency and safety of the hinge point maintenance.

[0031] Optionally, the step of maintaining the hinge points of the big pull rod and the elephant trunk beam and the hinge points of the boom and the elephant trunk beam respectively includes:

[0032] Maintain the hinge point of the big pull rod and the elephant trunk beam: the hinge points of the boom and the elephant trunk beam and the hinge points of the first hinge seat and the second hinge seat are in a fixed state; transport the new accessories to the maintenance platform through the electric hoist on the elephant trunk beam hanger on the ground; remove the accessories to be maintained at the hinge point on the maintenance platform and replace them with new accessories; use the electric hoist to transport the removed accessories to be maintained to the ground;

[0033] Maintain the hinge point of the boom and the elephant trunk beam: the hinge points of the big pull rod and the elephant trunk beam and the hinge points of the first hinge seat and the second hinge seat are in a fixed state; transport the new accessories to the maintenance platform through the electric hoist on the elephant trunk beam hanger on the ground; remove the accessories to be maintained at the hinge point on the maintenance platform and replace them with new accessories; use the electric hoist to transport the removed accessories to be maintained to the ground.

[0034] By adopting the above technical solution, the structure of the suspension system itself can be used to assist the maintenance personnel to quickly maintain the hinge points. The overall system has low cost and high efficiency when in use.

[0035] Optionally, the portal crane further includes a luffing mechanism. The luffing mechanism includes a rack and a luffing gearbox. One end of the rack is hinged to the boom. The rack is in transmission connection with the luffing gearbox. The rack is provided with a safety hole for a safety shaft to pass through; after the step of adjusting the suspension system to the minimum amplitude state, insert a safety pin into the safety hole of the rack.

[0036] By adopting the above technical solution, the safety of the suspension system in the hinge point maintenance state is further improved.

[0037] In summary, the present application includes at least one of the following beneficial technical effects:

[0038] 1. During the maintenance process of this application, the suspension system does not require adjustment amplitude and remains in a fixed state throughout the process, preventing interference of the structural components of the suspension system during maintenance, damaging the structural components and paint surface of the suspension system. At the same time, there is no obvious shaking during the maintenance process, with high safety. Moreover, no lifting equipment is required to hoist the suspension system during the entire maintenance process. Only maintenance personnel need to enter the maintenance platform to carry out the maintenance, with high maintenance efficiency. The entire system has a simple structure, is easy to use, and can effectively save costs.

[0039] 2. In the solution of this application, the maintenance platform and hinge seat do not block the driver's line of sight, do not affect the operation process of the boom, are convenient for maintenance, and do not cause problems such as water accumulation; the removed hinge shafts can be reused, and the maintenance operation process is safe.

[0040] 3. The structure of the hinge seat is simple, and the manufacturing and assembly difficulty is low. Description of the Drawings

[0041] Figure 1 It is a schematic structural diagram of a portal crane in the related art.

[0042] Figure 2 It is a schematic structural diagram of the luffing mechanism in the related art.

[0043] Figure 3 It is a schematic diagram of the state of the portal crane in the related art during the maintenance process.

[0044] Figure 4 It is a schematic structural diagram of the portal crane in the embodiment of this application in the minimum amplitude state.

[0045] Figure 5 It is a schematic diagram of the state of connection between the first hinge seat and the second hinge seat in the embodiment of this application.

[0046] Figure 6 It is a force analysis diagram of the pin shaft when repairing the hinge point between the maintenance tie rod and the elephant trunk beam in the embodiment of this application.

[0047] Figure 7 It is a force analysis diagram of the pin shaft when repairing the hinge point pin shaft between the boom and the elephant trunk beam in the embodiment of this application.

[0048] Figure 8 It is a schematic structural diagram of the portal crane in the embodiment of this application in the maximum amplitude state.

[0049] Description of the Reference Numerals:

[0050] 10. Seat frame; 20. Suspension system; 21. Large tie rod; 22. Boom; 23. Elephant trunk; 30. First hinge seat; 300. First web plate; 301. First pound plate; 31. Second hinge seat; 310. Second web plate; 311. Second pound plate; 40. Maintenance platform; 41. First ladder; 42. Second ladder; 50. Balance beam; 51. Small tie rod; 52. Counterweight; 60. Luffing mechanism; 61. Rack; 62. Luffing gearbox. Detailed implementation mode

[0051] The following will further elaborate on this application in conjunction with the attached Figures 4 - 8 drawings.

[0052] Embodiment 1

[0053] A portal crane with an auxiliary hinge point shaft system provided by an embodiment of this application, as Figure 4 shown, mainly includes a seat frame 10 and a suspension system 20 installed on the seat frame 10. The suspension system 20 mainly consists of a large tie rod 21, a boom 22 and an elephant trunk 23. One end of the large tie rod 21 and the boom 22 are respectively hinged to the seat frame 10, and their other ends are respectively hinged to the elephant trunk 23. On the side of the boom 22 facing away from the large tie rod 21, a first hinge seat 30 is provided, and at the same time, a second hinge seat 31 is provided on the side wall of the elephant trunk 23. When the suspension system 20 is adjusted to the minimum amplitude state, the connection part of the first hinge seat 30 and the second hinge seat 31 coincides. At this time, the connection part can be connected by a pin shaft, so as to fix the first hinge seat 30 and the second hinge seat 31. At the same time, maintenance platforms 40 are respectively installed at the hinge point positions of the large tie rod 21 and the elephant trunk 23, the hinge point positions of the boom 22 and the elephant trunk 23, and the installation positions of the first hinge seat 30 and the second hinge seat 31. Maintenance personnel can repair and replace the hinge shafts at the hinge point positions on the maintenance platform 40.

[0054] Among them, the minimum amplitude state of the suspension system 20 refers to the state when the angle between the side of the boom 22 facing away from the large tie rod 21 and the elephant trunk 23 is at the minimum angle. The minimum angles of different cranes are different, but there must be a minimum angle. When at the minimum angle, it is equivalent to the suspension system 20 being in a closed state.

[0055] The maintenance platform 40 is permanently fixed to the suspension system 20. When the suspension system 20 is in the minimum amplitude state, the maintenance platform 40 is in a horizontal state, and maintenance personnel can quickly and safely repair the hinge points on the maintenance platform 40.

[0056] To facilitate the maintenance personnel to transfer to the maintenance platform 40, first ladders 41 are installed on both the large tie rod 21 and the boom 22. The first ladders 41 are docked with the maintenance platform 40, and the maintenance personnel can transfer from the seat frame 10 to the maintenance platform 40 through the first ladders 41. Specifically, the first ladders 41 are arranged on the back of the large tie rod 21 and the boom 22 to avoid affecting the amplitude adjustment of the suspension system 20.

[0057] Meanwhile, a second ladder 42 is installed on the back of the elephant trunk 23. When the suspension system 20 is adjusted to the minimum amplitude state, the second ladder 42 is docked with the maintenance platform 40. Herein, the back of the elephant trunk 23 refers to the side facing upward of the elephant trunk 23 when the suspension system 20 is in the maximum amplitude state. In this embodiment, when the suspension system 20 is adjusted to the minimum amplitude state, the second ladder 42 is docked with the maintenance platform 40 at the hinge points of the large tie rod 21 and the elephant trunk 23 and the hinge points of the boom 22 and the elephant trunk 23. At this time, through the first ladder 41 and the second ladder 42, the maintenance personnel can quickly transfer among the three maintenance platforms 40, so as to maintain the hinge points on the maintenance platform 40.

[0058] Refer to Figure 5 , specifically, the first hinge seat 30 is composed of a first web 300 and a first pound plate 301. The first web 300 is welded on the boom 22, and the first pound plate 301 is fixed on the side of the first web 300 away from the boom 22. Similarly, the second hinge seat 31 is composed of a second web 310 and a second pound plate 311. The second web 310 is welded on the elephant trunk 23, and the second pound plate 311 is fixed on the side of the second web 310 away from the elephant trunk 23. Connecting holes for the pin shaft to pass through are formed on both the first pound plate 301 and the second pound plate 311, so that the two can be connected by the pin shaft during maintenance.

[0059] Preferably, the first pound plate 301 and the second pound plate 311 are provided in two pieces, so as to form a first U-shaped structure between the first hinge seat 30 and the boom 22, and a second U-shaped structure between the second hinge seat 31 and the elephant trunk 23. When the connection parts of the first hinge seat 30 and the second hinge seat 31 overlap, the open ends of the first U-shaped structure and the second U-shaped structure overlap with each other. At this time, the connection holes are respectively connected by the pin shaft, and the fixation of the first hinge seat 30 and the second hinge seat 31 can be completed. Specifically, a limiting end is further provided at one end of the pin shaft, and the diameter of the limiting end is larger than the diameter of the pin shaft to further improve the installation stability of the pin shaft.

[0060] Refer to Figure 4 , when the maintenance personnel complete the connection and fixation of the first hinge seat 30 and the second hinge seat 31 on the maintenance platform 40, the hinge points of the large tie rod 21 and the elephant trunk 23 and the hinge points of the boom 22 and the elephant trunk 23 can be respectively repaired and replaced at this time.

[0061] The present application designs the suspension system 20 to perform hinge point maintenance in the minimum amplitude state, and the main reasons for consideration are mainly the following aspects.

[0062] 1. The suspension system 20 also includes a balance beam 50 and a small tie rod 51. A counterweight 52 is mounted on one end of the balance beam 50, and the other end is hinged to one end of the small tie rod 51. The other end of the small tie rod 51 is hinged to the boom 22. When the suspension system 20 is in the minimum amplitude state, the counterweight 52 will be located below the hinge point between the balance beam 50 and the seat frame 10, so that the entire crane is in a low center of gravity state, increasing the safety of the maintenance process.

[0063] Second, the portal crane also includes a luffing mechanism 60, which includes a rack 61 and a luffing gearbox 62. One end of the rack 61 is hinged to the boom 22, and the rack 61 is in transmission connection with the luffing gearbox 62. The rack 61 is provided with a safety hole for the safety shaft to pass through. The safety shaft is inserted into the safety hole, and the boom 22 is further stabilized by the rack 61. Since the suspension system 20 is in the minimum amplitude state, the rack 61 exerts the smallest pulling force on the boom 22 at this time, so that the safety shaft is subjected to the smallest force, which can better ensure the safety of the suspension system 20 when it is in the maintenance state.

[0064] 3. The force on the pin between the first capstan 30 and the second capstan 31 is minimal, the strength of the pin is easier to meet and the safety is higher.

[0065] Taking a 25-ton gantry crane as an example, when the suspension system 20 is in the minimum amplitude state, when repairing the hinge point between the large pull rod 21 and the trunk beam 23, the number of pins is two, and the pin forces are as follows: Figure 6 As shown, according to the graphical method, at this time

[0066]

[0067] Where: G 象鼻梁 —The deadweight load of the trunk;

[0068] F 销轴 —The trunk load on the pin.

[0069] The pin shaft material is 45# round steel with a diameter of

[0070] 1. Calculation of pin bending strength:

[0071]

[0072]

[0073] Where: a—the distance from the end face when the pin is subjected to the maximum force at this point;

[0074] b — The distance from the other end face when the pin shaft is under the maximum force at this point;

[0075] L — The total length of the pin shaft;

[0076] d — The radius of the pin shaft;

[0077] σ — The bending stress on the pin shaft;

[0078] [σ x W — The allowable bending stress of the pin shaft;

[0079] After checking, it meets the allowable bending stress of the pin shaft.

[0080] 2. Shearing strength check of the pin shaft:

[0081]

[0082] In the formula: τ max — The shearing stress of the pin shaft;

[0083] [τ X — The allowable shearing stress of the pin shaft;

[0084] After checking, it meets the shearing strength of the pin shaft.

[0085] When repairing the hinge point between the maintenance boom 22 and the elephant trunk beam 23, the number of pin shafts is two, and the forces on the pin shafts are as Figure 7 shown. According to the method of intersection and graphical method of the plane force system,

[0086]

[0087] y = 10.44

[0088]

[0089] In the formula: G 象鼻梁 — The self-weight load of the elephant trunk beam;

[0090] F 销轴 — The load of the elephant trunk beam on the pin shaft;

[0091] Take the material of the pin shaft as 45# round steel, and the diameter is

[0092] 1. Bending strength check of the pin shaft:

[0093]

[0094]

[0095] In the formula: a — The distance from the end face when the pin shaft is under the maximum force at this point;

[0096] b — The distance from the other end face when the pin shaft is under the maximum force at this point;

[0097] L — The total length of the pin shaft;

[0098] d — The radius of the pin shaft;

[0099] σ — The bending stress on the pin shaft;

[0100] [σ x W — The allowable bending stress of the pin shaft;

[0101] After checking, it meets the allowable bending stress of the pin shaft.

[0102] 2. Check the shear strength of the pin shaft:

[0103]

[0104] In the formula: In the formula: τ max — The shear stress of the pin shaft;

[0105] [τ X — The allowable shear stress of the pin shaft.

[0106] After checking, it meets the shear strength of the pin shaft.

[0107] In summary, when the suspension system 20 is designed to be in the minimum amplitude state for hinge point maintenance, the force on the pin shaft is the smallest, the strength of the pin shaft is easier to meet, and the safety is higher.

[0108] Therefore, the implementation principle of this embodiment is: during maintenance, only need to adjust the suspension system 20 to the minimum amplitude state, and then connect the first hinge seat 30 and the second hinge seat 31 with a pin shaft on the maintenance platform 40, then other hinge points can be maintained. During the whole process, the suspension system 20 does not need to adjust the amplitude and is in a fixed state throughout, thus preventing interference and damage to the structural members of the suspension system 20 during maintenance. At the same time, there will be no obvious shaking during the maintenance process, improving the safety. Moreover, during the whole maintenance process, there is no need to use a lifting device to hoist the suspension system 20, and only maintenance personnel need to enter the maintenance platform 40 to carry out the maintenance, greatly improving the maintenance efficiency.

[0109] Embodiment 2

[0110] A hinge point maintenance method for a portal crane provided by an embodiment of the present application mainly includes the following steps:

[0111] S1. Adjust the suspension system 20 to the minimum amplitude state.

[0112] Among them, the portal crane further includes a luffing mechanism 60. The luffing mechanism 60 includes a rack 61 and a luffing gearbox 62. One end of the rack 61 is hinged to the boom 22. The rack 61 is in transmission connection with the luffing gearbox 62. The rack 61 is provided with a safety hole for a safety shaft to pass through. Specifically, the suspension system 20 is adjusted to the minimum amplitude state through the luffing mechanism 60. Then, a safety pin is inserted into the safety hole of the rack 61 to ensure the stability of the suspension system 20 when it is in the minimum amplitude state.

[0113] In this state, the connection parts of the first hinge seat 30 and the second hinge seat 31 will coincide, preparing for subsequent maintenance work.

[0114] S2. Connect the first hinge seat 30 and the second hinge seat 31 with a pin shaft on the maintenance platform 40.

[0115] Specifically, the maintenance personnel enter the maintenance platform 40. The pin shaft is transported to the maintenance platform 40 through the electric hoist on the hanger of the elephant trunk 23. The maintenance personnel install the pin shaft on the first hinge seat 30 and the second hinge seat 31. At this time, the suspension system 20 is in a redundant structure state, and the stability of the suspension system 20 is further enhanced.

[0116] S3. Maintain the hinge points of the large tie rod 21 and the elephant trunk 23 and the hinge points of the boom 22 and the elephant trunk 23 respectively.

[0117] In this step, it should be noted that only one hinge point can be maintained at a time to ensure the safety and effectiveness of the maintenance process. The specific maintenance process includes: transporting new accessories to the maintenance platform 40 through the electric hoist on the hanger of the elephant trunk 23 on the ground. Then, removing the accessories to be maintained at the hinge point on the maintenance platform 40, replacing them with new accessories, and finally transporting the removed accessories to be maintained to the ground by using the electric hoist.

[0118] Among them, a first ladder 41 is installed on the large tie rod 21 and the boom 22, and a second ladder 42 is installed on the elephant trunk 23. Both the first ladder 41 and the second ladder 42 are docked with the maintenance platform 40. Thus, when maintaining different hinge points, the maintenance personnel can quickly transfer between different maintenance platforms 40 through the first ladder 41 and the second ladder 42, improving the maintenance efficiency of the hinge points.

[0119] S4. After the maintenance of the hinge points of the large tie rod 21 and the elephant trunk 23 and the hinge points of the boom 22 and the elephant trunk 23 is completed, remove the pin shaft between the first hinge seat 30 and the second hinge seat 31, and transport the pin shaft back to the ground by using the electric hoist; after the maintenance personnel come down from the suspension system 20, remove the safety pin, and the suspension system 20 is reset. As Figure 8 shown, the maintenance is completed.

[0120] The implementation principle of this embodiment is as follows: By first adjusting the suspension system 20 to the minimum amplitude state, connecting the first hinge seat 30 and the second hinge seat 31 on the maintenance platform 40, and then maintaining each hinge point respectively, the maintenance of the hinge points can be completed quickly and safely without using too many devices or personnel. This method not only improves the maintenance efficiency but also reduces the maintenance cost, and has high practical value.

[0121] The above are all preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A portal crane with an auxiliary hinge point shaft system, characterized in that, It includes a seat frame (10) and a suspension system (20) mounted on the seat frame (10). The suspension system (20) includes a large tie rod (21), a boom (22) and a jib nose (23). One end of the large tie rod (21) and one end of the boom (22) are respectively hinged to the seat frame (10), and the other end of the large tie rod (21) and the other end of the boom (22) are respectively hinged to the jib nose (23). A first hinge seat (30) is provided on the side of the boom (22) facing away from the large tie rod (21), and a second hinge seat (31) is provided on the side wall of the jib nose (23). When the suspension system (20) is adjusted to the minimum amplitude state, the connection part of the first hinge seat (30) and the second hinge seat (31) coincides. The minimum amplitude state is the state when the included angle between the side of the boom (22) facing away from the large tie rod (21) and the jib nose (23) is at the minimum included angle. Among them, maintenance platforms (40) are respectively installed at the hinge point position of the large tie rod (21) and the jib nose (23), the hinge point position of the boom (22) and the jib nose (23), and the installation positions of the first hinge seat (30) and the second hinge seat (31). When the suspension system (20) is in the minimum amplitude state, the maintenance platform (40) is in a horizontal state.

2. The portal crane with an auxiliary hinge point shaft system according to claim 1, characterized in that: The suspension system (20) further includes a balance beam (50) and a small tie rod (51). A counterweight (52) is installed at one end of the balance beam (50). The other end of the balance beam (50) is hinged to one end of the small tie rod (51), and the other end of the small tie rod (51) is hinged to the boom (22). When the suspension system (20) is in the minimum amplitude state, the counterweight (52) is below the hinge point of the balance beam (50) and the seat frame (10).

3. The portal crane with an auxiliary hinge point shaft system according to claim 1, characterized in that: A first ladder (41) is installed on the large tie rod (21) and the boom (22), and the first ladder (41) is docked with the maintenance platform (40).

4. The portal crane with an auxiliary hinge point shaft system according to claim 3, characterized in that: A second ladder (42) is installed on the jib nose (23). When the suspension system (20) is adjusted to the minimum amplitude state, the second ladder (42) is docked with the maintenance platform (40).

5. A portal crane with an auxiliary hinge point shaft system according to claim 1, characterized in that: The first hinge seat (30) includes a first web (300) and a first pound plate (301). The first web (300) is fixedly connected to the boom (22), and the first pound plate (301) is fixed on the side of the first web (300) away from the boom (22). The second hinge seat (31) includes a second web (310) and a second pound plate (311). The second web (310) is fixedly connected to the jib nose (23), and the second pound plate (311) is fixed on the side of the second pound plate (311) away from the jib nose (23). Connection holes for a supply shaft to pass through are provided on both the first pound plate (301) and the second pound plate (311).

6. The portal crane with an auxiliary hinge point shaft system according to claim 5, characterized in that: The first pound plate (301) and the second pound plate (311) are provided with at least two pieces, so as to form a first U-shaped structure between the first hinge seat (30) and the boom (22), and a second U-shaped structure between the second hinge seat (31) and the elephant trunk beam (23).

7. A portal crane with an auxiliary hinge point shaft system according to claim 1, characterized in that: The portal crane further includes a luffing mechanism (60), the luffing mechanism (60) includes a rack (61) and a luffing gearbox (62), one end of the rack (61) is hinged to the boom (22), the rack (61) is in transmission connection with the luffing gearbox (62), and the rack (61) is provided with a safety hole for a safety shaft to pass through.

8. A maintenance method for the hinge points of a portal crane, based on the portal crane with an auxiliary hinge point shaft system according to any one of claims 1-7, characterized in that, Including the following steps: Adjust the suspension system (20) to the minimum amplitude state; Connect the first hinge seat (30) and the second hinge seat (31) on the maintenance platform (40) by using a pin shaft; Maintain the hinge points of the main tie rod (21) and the elephant trunk beam (23) and the hinge points of the boom (22) and the elephant trunk beam (23) respectively. Among them, only the hinge points of the main tie rod (21) and the elephant trunk beam (23) or the hinge points of the boom (22) and the elephant trunk beam (23) can be maintained at the same time.

9. The hinge point maintenance method of the portal crane according to claim 8, characterized in that, The step of maintaining the hinge points of the main tie rod (21) and the elephant trunk beam (23) and the hinge points of the boom (22) and the elephant trunk beam (23) respectively includes: Maintain the hinge point of the main tie rod (21) and the elephant trunk beam (23): the hinge points of the boom (22) and the elephant trunk beam (23) and the first hinge seat (30) and the second hinge seat (31) are in a fixed state; convey new accessories to the maintenance platform (40) through the electric hoist on the hanger of the elephant trunk beam (23) on the ground; remove the accessories to be repaired at the hinge point on the maintenance platform (40) and replace them with new accessories; convey the removed accessories to be repaired to the ground by using the electric hoist; Maintain the hinge point of the boom (22) and the elephant trunk beam (23): the hinge points of the main tie rod (21) and the elephant trunk beam (23) and the first hinge seat (30) and the second hinge seat (31) are in a fixed state; convey new accessories to the maintenance platform (40) through the electric hoist on the hanger of the elephant trunk beam (23) on the ground; remove the accessories to be repaired at the hinge point on the maintenance platform (40) and replace them with new accessories; convey the removed accessories to be repaired to the ground by using the electric hoist.

10. The hinge point maintenance method of the portal crane according to claim 8, characterized in that: The portal crane further includes a luffing mechanism (60), the luffing mechanism (60) includes a rack (61) and a luffing gearbox (62), one end of the rack (61) is hinged to the boom (22), the rack (61) is in transmission connection with the luffing gearbox (62), and the rack (61) is provided with a safety hole for a safety shaft to pass through; after the step of adjusting the suspension system (20) to the minimum amplitude state, insert a safety pin into the safety hole of the rack (61).

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