Portal crane adapted to multi-working-condition hoisting operation

Abstract

This invention relates to the field of crane beam technology and discloses a gantry crane adaptable to multiple working conditions for lifting operations. The crane includes: two crane supports; a gantry load-bearing beam; and a working pressure indicator mechanism. The working pressure indicator mechanism is located on both sides of the gantry load-bearing beam. It is used to detect the working pressure while simultaneously triggering a buffering action and locking the crane hook lock in a linked manner. When the pressure exceeds the limit or the working condition is unstable, the linkage structure between the hook lock limit arm and the locking frame can quickly lock the hook lock, avoiding the risk of disengagement or the load falling during lifting. This mechanism is integrated into the main structure of the gantry crane, without occupying additional space. Furthermore, through a linkage design, it integrates pressure monitoring, buffer protection, and hook lock locking into one unit, possessing strong adaptability to various working conditions and high system integration. It is particularly suitable for multi-working-condition environments such as ports, warehouses, and construction sites where frequent switching of operations is required.

Description

Technical Field

[0001] This invention relates to the field of crane beam technology, and in particular to a gantry crane adapted to lifting operations under multiple working conditions. Background Technology

[0002] Gantry cranes, also known as portal cranes, are a type of bridge crane. Their metal structure is in the shape of a portal frame, with two legs installed under the main beam, allowing them to travel directly on ground tracks. The main beam can have cantilever beams extending outwards at both ends. They have advantages such as high site utilization and a wide operating range. This equipment is widely used in ports, freight yards, warehouses, shipyards, construction sites, and large equipment manufacturing.

[0003] According to Chinese Patent Publication No. CN115818453A, a gantry crane adaptable to multi-condition lifting operations is disclosed. Its technical solution includes a crossbeam section and outrigger sections. The outrigger sections are provided in two sets, each including a crane top seat and a crane base. Each outrigger section also includes support arms and hydraulic cylinders, each provided in two sets. The two sets of support arms are respectively hinged to both ends of the crane base, and the two sets of hydraulic cylinders are hinged to the middle of the crane base to provide support for the corresponding support arms. A hydraulic telescopic device is hinged to the top of each support arm, and the other end of the hydraulic telescopic device is hinged to the crane top seat. This invention reduces the space occupied by the crane by adjusting the height of the crane top mount and the spacing between the crane top mounts, which is beneficial for working under different conditions and is suitable for working environments with small spaces. However, this crane still has shortcomings. During hoisting operations, it is difficult for operators to intuitively judge whether the current load is within the safe range, which can easily lead to overloading due to misjudgment. When the load is too large, the crane beam may develop fatigue cracks due to long-term heavy load and repeated bending stress, which will reduce its load-bearing capacity and may even lead to beam breakage in severe cases, thus causing a safety accident. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a gantry crane adaptable to various lifting conditions, thus solving the above problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a gantry crane adaptable to multi-condition lifting operations, comprising: Two crane supports; Portal load-bearing beam; the portal load-bearing beam is installed at the top of two crane supports; A working pressure indicator mechanism is provided; the working pressure indicator mechanism is installed on both sides of the portal frame load-bearing beam, and is used to trigger a buffering action and lock the crane hook lock in a linkage manner while detecting the working pressure; the working pressure indicator mechanism includes a pressure support block, a sliding guide rail, a support spring, a push-button power switch, a trigger push rod, an indicator light, a linkage arm, a hook lock limit arm, a telescopic rod, a buffer spring, an upper pressure ring, a lower pressure ring, a reset torsion spring, a rotating frame, a connecting arm, and a locking frame.

[0006] Preferably, when the hook is loaded with a heavy object, the portal frame beam sinks slightly downwards, and the pressure support block descends vertically along the sliding guide rail, compressing the support spring. The trigger push rod moves downwards synchronously. Before the trigger push rod contacts the push-button power switch, the indicator light remains off, reminding the driver that the load is within the safe range. When the trigger push rod presses down the push-button power switch, the indicator light illuminates with the first color, indicating that the rated load has been reached. The pressure support block continues to descend, further compressing the support spring, and the indicator light switches to the second color, triggering an overload alarm.

[0007] Preferably, the bottom ends of both crane supports are fixedly connected to rubber pulley assemblies, and the bottom ends of both sliding guide rails are fixedly connected to the top ends of the two crane supports.

[0008] Preferably, pressure support blocks are vertically slidably connected to the inner walls of both sliding guide rails, indicator lights are fixedly connected to one side wall of both sliding guide rails, multiple support springs are fixedly connected to the inner walls of the bottom ends of both sliding guide rails, trigger push rods are fixedly connected to the bottom ends of both pressure support blocks, push-type power switches are provided at the bottom of both trigger push rods, the top ends of the multiple support springs are respectively fixedly connected to the bottom ends of the two pressure support blocks, two pulley grooves are formed on the upper surface of the pressure support blocks, luffing travel pulleys are provided inside the two pulley grooves, the luffing travel pulleys are rotatably connected to the pressure support blocks, and a motor is provided at the rotatable connection between the pressure support blocks and the luffing travel pulleys, the output end of the motor is drivenly connected to the luffing travel pulleys.

[0009] Preferably, the bottom ends of the two push-button power switches are respectively fixedly connected to the inner walls of the bottom ends of the two sliding guide rails, and the two push-button power switches are respectively electrically connected to the two indicator lights.

[0010] Preferably, a linkage arm is fixedly connected to the outer side of the pressure support block, a hook lock limiting arm is fixedly connected to the lower end of the linkage arm, telescopic rods are provided on both sides of the lower end of the hook lock limiting arm, the fixed end of the telescopic rod is fixedly connected to the hook lock limiting arm, and a locking frame is fixedly connected to the free end of the hook lock limiting arm.

[0011] Preferably, a buffer spring is provided between the free end of the telescopic rod and the locking frame, the buffer spring is sleeved on the outside of the free end of the telescopic rod, a lower pressure ring is fixedly connected to the middle of the upper surface of the locking frame, and an upper pressure ring is provided above the lower pressure ring.

[0012] Preferably, the upper pressure ring is rotatably connected to the lower end of the rotating frame, the rotating frame is rotatably connected to the outside of the hook lock limiting arm, and a reset torsion spring is provided at the rotatable connection between the rotating frame and the hook lock limiting arm.

[0013] Preferably, connecting arms are fixedly connected to both the left and right sides of the upper surface of the locking frame, and a hook lock limiting arm is slidably connected between the two connecting arms. Through the linkage structure of the pressure support block, the trigger push rod and the indicator light, real-time monitoring and visual prompts of the lifting operation pressure are realized. The operator can judge whether the load exceeds the safe range according to the status of the indicator light, so as to adjust the operation strategy in time and effectively prevent safety accidents caused by overload. When the pressure exceeds the limit or the operation status is unstable, the linkage structure of the hook lock limiting arm and the locking frame can quickly lock the hook lock to avoid the risk of disengagement or falling of heavy objects during the hoisting process.

[0014] Preferably, each of the two pressure support blocks is provided with an installation mechanism at its top. The installation mechanism includes a support plate, a limiting plate, an installation plate, a limiting rod, a nut, a connecting plate, and a limiting groove. The top of each of the multiple support plates is fixedly connected to an installation plate. The bottom of the portal beam is respectively attached to the top of the two pressure support blocks. Each of the two pressure support blocks is provided with a connecting plate at its top. The bottom of each of the two connecting plates is provided with multiple limiting grooves. The multiple limiting grooves are attached to the middle of the portal beam. Limiting plates are fixedly connected to both sides of each of the two connecting plates. The top of each of the two connecting plates is provided with a limiting rod. The two limiting rods pass through multiple connecting plates respectively. Nuts are threaded to both ends of each of the two limiting rods.

[0015] Preferably, two adjacent support plates are fixedly connected to the two side walls of the pressure support block, the bottom ends of the two connecting plates are respectively attached to the top ends of the two pressure support blocks, multiple connecting plates pass through multiple limiting plates, and multiple nuts are respectively placed on the outside of multiple connecting plates. Beneficial effects

[0016] This invention provides a gantry crane adaptable to various lifting conditions. Compared with the prior art, it has the following advantages: In this invention, through the designed working pressure indication mechanism, when a load is attached to the hook, the portal frame load-bearing beam sinks slightly downwards, and the pressure support block descends vertically along the sliding guide rail, compressing the support spring. The trigger push rod moves downwards synchronously. Before the trigger push rod contacts the push-button power switch, the indicator light remains off, reminding the driver that the load is within the safe range. When the trigger push rod presses down the push-button power switch, the indicator light illuminates with the first color, indicating that the rated load has been reached. The pressure support block continues to descend, further compressing the support spring, and the indicator light switches to the second color, triggering an overload alarm. Furthermore, the downward movement of the pressure support block simultaneously drives the hook lock limit arm downwards via the linkage arm. The hook lock limit arm is locked by two telescopic rods. When the entire frame is pressed down, the lower pressure ring on the locking frame first contacts the hook back, compressing the buffer spring to absorb the instantaneous impact. When the load exceeds the set upper limit, the lower pressure ring and the upper pressure ring clamp the hook back. The rotating frame rotates under the action of the return torsion spring, causing the upper and lower pressure rings to form a ring-type mechanical lock. After the ring lock is engaged, a sliding lock is formed between the connecting arm and the hook lock limit arm, forcibly limiting the hook and preventing it from disengaging or continuing to lift. This achieves mechanical interlock protection with overload locking, through the linkage of the pressure support block, trigger push rod, and indicator light. The structure enables real-time monitoring and visual alerts of lifting operation pressure. Operators can determine whether the load exceeds the safe range based on the indicator light status, thereby adjusting their work strategies in a timely manner and effectively preventing safety accidents caused by overload. Through the linkage structure of the pressure support block, trigger push rod, and indicator light, real-time monitoring and visual alerts of lifting operation pressure are achieved. Operators can determine whether the load exceeds the safe range based on the indicator light status, thereby adjusting their work strategies in a timely manner and effectively preventing safety accidents caused by overload. When the pressure exceeds the limit or the operation status is unstable, the linkage structure of the hook lock limit arm and locking frame can quickly lock the hook lock, avoiding the risk of hook detachment or heavy objects falling during hoisting. This mechanism is integrated into the main structure of the gantry crane, without occupying additional space. Through linkage design, it integrates the three major functions of pressure monitoring, buffer protection, and hook lock locking into one unit, possessing strong adaptability to working conditions and high system integration. It is particularly suitable for multi-working environment with frequent operation switching, such as ports, warehouses, and construction sites.

[0017] 2. In this invention, the top of the pressure support block is fitted to the bottom of the portal frame beam through the installation mechanism, ensuring that the contact surfaces are flat and tight. At this time, the multiple limiting grooves at the bottom of the connecting plate fit into the middle of the portal frame beam, playing a preliminary positioning role and preventing displacement during installation. Subsequently, the limiting rod passes through the connecting plate, the limiting plate, and the support plate, making all components integrated. The two ends of the limiting rod are fastened with nuts. By adjusting the tightness of the nuts, the overall fastening force of the installation mechanism can be controlled. After installation, the nuts firmly lock the limiting rod, making the pressure support block, the connecting plate, the limiting plate, and the support plate form a stable overall structure. This structure not only ensures that the pressure support block will not loosen due to vibration or impact during operation, but also facilitates subsequent maintenance and replacement. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a gantry crane adapted to multiple working conditions for lifting operations proposed in this invention. Figure 2 This is a schematic diagram of the structure of a gantry crane adapted to multiple working conditions in operation, as proposed in this invention. Figure 3 This is a cross-sectional structural schematic diagram of a gantry crane adapted to multiple working conditions for lifting operations proposed in this invention. Figure 4 This invention proposes a gantry crane adaptable to various lifting conditions. Figure 2 Enlarged view of A in the middle; Figure 5 This is an exploded structural diagram of a working pressure indication mechanism in a gantry crane adapted to multi-condition lifting operations, as proposed in this invention. Figure 6 This is a partial structural diagram of a working pressure indication mechanism in a gantry crane adapted to multi-condition lifting operations, as proposed in this invention. Figure 7 This invention proposes a gantry crane adaptable to various lifting conditions. Figure 6 Enlarged view of B in the middle; Figure 8 This is a schematic diagram of the installation mechanism in a gantry crane adapted to multiple lifting conditions, as proposed in this invention.

[0019] Legend: 1. Crane bracket; 2. Rubber pulley assembly; 3. Gantry beam; 4. Working pressure indicator mechanism; 401. Pressure support block; 402. Sliding guide rail; 403. Support spring; 404. Push-button power switch; 405. Trigger rod; 406. Indicator light; 407. Linkage arm; 408. Hook lock limit arm; 409. Telescopic rod; 410. Buffer spring; 411. Upper pressure ring; 412. Lower pressure ring; 413. Return torsion spring; 414. Rotating frame; 415. Connecting arm; 416. Locking frame; 5. Installation mechanism; 501. Support plate; 502. Limiting plate; 503. Mounting plate; 504. Limiting rod; 505. Nut; 506. Connecting plate; 507. Limiting groove; 6. Luffing travel pulley; 7. Pulley groove. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1 - Figure 8 The present invention provides two technical solutions, specifically including the following embodiments: Example

[0022] A gantry crane adaptable to multi-condition lifting operations includes: two crane supports 1; a gantry load-bearing beam 3; the gantry load-bearing beam 3 is disposed at the top of the two crane supports 1; a working pressure indication mechanism 4; the working pressure indication mechanism 4 is disposed on both sides of the gantry load-bearing beam 3, and the working pressure indication mechanism 4 is used to trigger a buffering effect and lock the crane hook lock in a linkage manner while detecting the working pressure.The working pressure indication mechanism 4 includes a pressure support block 401, a sliding guide rail 402, a support spring 403, a push-button power switch 404, a trigger push rod 405, an indicator light 406, a linkage arm 407, a hook lock limit arm 408, a telescopic rod 409, a buffer spring 410, an upper pressure ring 411, a lower pressure ring 412, a reset torsion spring 413, a rotating frame 414, a connecting arm 415, and a locking frame 416. Rubber pulley assemblies 2 are fixedly connected to the bottom ends of both crane supports 1. The bottom ends of both sliding guide rails 402 are fixedly connected to the top ends of both crane supports 1. Pressure support blocks 401 are vertically slidably connected to the inner walls of both sliding guide rails 402. Indicator lights are fixedly connected to one side wall of both sliding guide rails 402. The lamp 406 has multiple support springs 403 fixedly connected to the inner walls of the bottom ends of the two sliding guide rails 402. The bottom ends of the two pressure support blocks 401 are fixedly connected to trigger push rods 405. Each trigger push rod 405 has a push-button power switch 404 at its bottom. The tops of the multiple support springs 403 are fixedly connected to the bottom ends of the two pressure support blocks 401. The bottom ends of the two push-button power switches 404 are fixedly connected to the inner walls of the bottom ends of the two sliding guide rails 402. The two push-button power switches 404 are electrically connected to the two indicator lights 406. A linkage arm 407 is fixedly connected to the outer side of the pressure support block 401. A hook lock limiting arm 408 is fixedly connected to the lower end of the linkage arm 407. The lower end of the hook lock limiting arm 408... Telescopic rods 409 are provided on both sides. The fixed end of the telescopic rod 409 is fixedly connected to the hook lock limiting arm 408. The free end of the hook lock limiting arm 408 is fixedly connected to the locking frame 416. A buffer spring 410 is provided between the free end of the telescopic rod 409 and the locking frame 416. The buffer spring 410 is sleeved on the outside of the free end of the telescopic rod 409. A lower pressure ring 412 is fixedly connected to the middle of the upper surface of the locking frame 416. An upper pressure ring 411 is provided above the lower pressure ring 412. The upper pressure ring 411 is rotatably connected to the lower end of the rotating frame 414. The rotating frame 414 is rotatably connected to the outside of the hook lock limiting arm 408. A return torsion spring 413 is provided at the rotatable connection between the rotating frame and the hook lock limiting arm 408. The left and right sides of the upper surface of the locking frame 416 are... Each support block 401 is fixedly connected to a connecting arm 415, with a hook-lock limiting arm 408 slidably connected between the two connecting arms 415. Two pulley grooves 7 are formed on the upper surface of the pressure support block 401, and each groove 7 contains a luffing travel pulley 6. The luffing travel pulley 6 is rotatably connected to the pressure support block 401, and a motor is installed at the rotatable connection between the pressure support block 401 and the luffing travel pulley 6. The motor's output is connected to the luffing travel pulley 6 for transmission. When the motor drives the luffing travel pulley 6 to rotate, movement occurs between the luffing travel pulley 6 and the portal frame 3, thereby causing the crane support 1 to move left and right. This allows for free variation of the crane's working span, meeting the construction needs of pits of different widths.

[0023] During operation, when the hook is loaded with a heavy object, the portal beam 3 sinks slightly downwards, and the pressure support block 401 descends vertically along the sliding guide rail 402, compressing the support spring 403. The trigger push rod 405 moves downwards synchronously. Before the trigger push rod 405 contacts the push-button power switch 404, the indicator light 406 remains off, reminding the driver that the load is within the safe range. Just as the trigger push rod 405 presses down the push-button power switch 404, the indicator light 406 illuminates with its first color, indicating that the rated load has been reached. The pressure support block 401 continues to descend, and the support spring 403 further... As the load compresses, indicator light 406 switches to a second color, triggering an overload alarm. Simultaneously, the downward movement of pressure support block 401, via linkage arm 407, drives hook lock limit arm 408 downwards. Hook lock limit arm 408, through two telescopic rods 409, presses down locking frame 416. The lower pressure ring 412 on locking frame 416 first contacts the hook back, compressing buffer spring 410 to absorb the instantaneous impact. When the load exceeds the set upper limit, lower pressure ring 412 clamps the hook back with upper pressure ring 411, and rotating frame 414 rotates under the action of return torsion spring 413. The rotation causes the upper pressure ring 411 and the lower pressure ring 412 to form a ring-type mechanical lock. After the ring lock is engaged, a sliding lock is formed between the connecting arm 415 and the hook lock limiting arm 408, forcibly limiting the hook and preventing it from disengaging or continuing to lift. This achieves mechanical interlock protection with overload locking. Through the linkage structure of the pressure support block 401, the trigger push rod 405, and the indicator light 406, real-time monitoring and visual prompts of the lifting operation pressure are achieved. Operators can judge whether the load exceeds the safe range based on the status of the indicator light 406, thereby adjusting the operation strategy in a timely manner and effectively preventing overload. Overload-related safety accidents can be prevented by the linkage structure of the pressure support block 401, trigger push rod 405, and indicator light 406, which enables real-time monitoring and visual prompts of lifting operation pressure. Operators can judge whether the load exceeds the safe range based on the status of indicator light 406, and thus adjust the operation strategy in a timely manner to effectively prevent safety accidents caused by overload. When the pressure exceeds the limit or the operation status is unstable, the linkage structure of hook lock limit arm 408 and locking frame 416 can quickly lock the hook lock to avoid the risk of hooking off or heavy objects falling during hoisting. Example

[0024] Based on Embodiment 1, each of the two pressure support blocks 401 is provided with an installation mechanism 5 at its top. The installation mechanism 5 includes a support plate 501, a limiting plate 502, an installation plate 503, a limiting rod 504, a nut 505, a connecting plate 506, and a limiting groove 507. The tops of the multiple support plates 501 are fixedly connected to the installation plates 503. The bottom ends of the portal beam 3 are respectively attached to the tops of the two pressure support blocks 401. Each of the two pressure support blocks 401 is provided with a connecting plate 506 at its top. The bottom ends of the two connecting plates 506 are provided with multiple limiting grooves 507, which are attached to the portal beam. In the middle of section 3, limit plates 502 are fixedly connected to both sides of the two connecting plates 506. Limiting rods 504 are provided at the top of each of the two connecting plates 506, and each limiting rod 504 passes through multiple connecting plates 506. Nuts 505 are threaded to both ends of each limiting rod 504. Two adjacent support plates 501 are fixedly connected to the two side walls of the pressure support block 401. The bottom ends of the two connecting plates 506 are respectively attached to the top ends of the two pressure support blocks 401. Multiple connecting plates 506 pass through multiple limiting plates 502, and multiple nuts 505 are placed on the outer sides of the multiple connecting plates 506 to control the pressure. The top of the support block 401 fits snugly against the bottom of the portal beam 3, ensuring a flat and tight contact surface. At this point, the multiple limiting grooves 507 at the bottom of the connecting plate 506 fit precisely into the middle of the portal beam 3, providing initial positioning and preventing displacement during installation. Subsequently, the limiting rod 504 passes through the connecting plate 506, the limiting plate 502, and the support plate 501, connecting all components into one unit. The two ends of the limiting rod 504 are secured with nuts 505. By adjusting the tightness of the nuts 505, the overall fastening force of the installation mechanism 5 can be controlled. After installation, the nuts 505 will limit the... The positioning rod 504 is firmly locked, making the pressure support block 401, connecting plate 506, limiting plate 502 and support plate 501 form a stable overall structure. This structure not only ensures that the pressure support block 401 will not loosen due to vibration or impact during operation, but also facilitates subsequent maintenance and replacement. Through the cooperation of the limiting groove 507 and the portal load-bearing beam 3, the installation mechanism achieves rapid positioning, reducing the alignment time during the installation process. At the same time, the setting of the limiting rod 504 and the limiting 502 keeps the relative position between the components fixed, avoiding the problem of mechanism failure or inaccurate detection caused by installation errors.

[0025] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A gantry crane adaptable to multiple working conditions for lifting operations, characterized in that, include: Two crane supports (1); Portal load-bearing beam (3); the portal load-bearing beam (3) is set at the top of two crane supports (1); Working pressure indication mechanism (4); The working pressure indication mechanism (4) is set on both sides of the portal load-bearing beam (3). The working pressure indication mechanism (4) is used to trigger the buffering effect and lock the crane hook lock in a linkage manner while detecting the working pressure. The working pressure indication mechanism (4) includes a pressure support block (401), a sliding guide rail (402), a support spring (403), a push-type power switch (404), a trigger push rod (405), an indicator light (406), a linkage arm (407), a hook lock limit arm (408), a telescopic rod (409), a buffer spring (410), an upper pressure ring (411), a lower pressure ring (412), a reset torsion spring (413), a rotating frame (414), a connecting arm (415), and a locking frame (416).

2. A gantry crane adaptable to multi-condition lifting operations according to claim 1, characterized in that: The bottom ends of the two crane supports (1) are fixedly connected to rubber pulley assemblies (2), and the bottom ends of the two sliding guide rails (402) are fixedly connected to the top ends of the two crane supports (1).

3. A gantry crane adaptable to multi-condition lifting operations according to claim 1, characterized in that: The inner walls of the two sliding guide rails (402) are vertically slidably connected with pressure support blocks (401). One side wall of the two sliding guide rails (402) is fixedly connected with an indicator light (406). The inner walls of the bottom ends of the two sliding guide rails (402) are fixedly connected with multiple support springs (403). The bottom ends of the two pressure support blocks (401) are fixedly connected with trigger push rods (405). The bottom of the two trigger push rods (405) is provided with a push-type power switch (404). The top ends of the multiple support springs (403) are respectively fixedly connected to the bottom ends of the two pressure support blocks (401).

4. A gantry crane adaptable to multi-condition lifting operations according to claim 1, characterized in that: The bottom ends of the two push-button power switches (404) are respectively fixedly connected to the inner walls of the bottom ends of the two sliding guide rails (402), and the two push-button power switches (404) are respectively electrically connected to the two indicator lights (406).

5. A gantry crane adaptable to multi-condition lifting operations according to claim 1, characterized in that: A linkage arm (407) is fixedly connected to the outside of the pressure support block (401). A hook lock limiting arm (408) is fixedly connected to the lower end of the linkage arm (407). Telescopic rods (409) are provided on both sides of the lower end of the hook lock limiting arm (408). The fixed end of the telescopic rod (409) is fixedly connected to the hook lock limiting arm (408). A locking frame (416) is fixedly connected to the free end of the hook lock limiting arm (408). Two pulley grooves (7) are opened on the upper surface of the pressure support block (401). A variable amplitude traveling pulley (6) is provided inside the two pulley grooves (7). The variable amplitude traveling pulley (6) is rotatably connected to the pressure support block (401). A motor is provided at the rotatable connection between the pressure support block (401) and the variable amplitude traveling pulley (6). The output end of the motor is connected to the variable amplitude traveling pulley (6) in a transmission manner.

6. A gantry crane adaptable to multi-condition lifting operations according to claim 5, characterized in that: A buffer spring (410) is provided between the free end of the telescopic rod (409) and the locking frame (416). The buffer spring (410) is sleeved on the outside of the free end of the telescopic rod (409). A lower pressure ring (412) is fixedly connected in the middle of the upper surface of the locking frame (416). An upper pressure ring (411) is provided above the lower pressure ring (412).

7. A gantry crane adaptable to multi-condition lifting operations according to claim 6, characterized in that: The upper pressure ring (411) is rotatably connected to the lower end of the rotating frame (414), the rotating frame (414) is rotatably connected to the outside of the hook lock limiting arm (408), and a reset torsion spring (413) is provided at the rotatable connection between the rotating frame and the hook lock limiting arm (408).

8. A gantry crane adaptable to multi-condition lifting operations according to claim 5, characterized in that: The locking frame (416) has connecting arms (415) fixedly connected to both the left and right sides of its upper surface, and a hook lock limiting arm (408) is slidably connected between the two connecting arms (415).

9. A gantry crane adaptable to multi-condition lifting operations according to claim 1, characterized in that: Each of the two pressure support blocks (401) is provided with an installation mechanism (5) at its top. The installation mechanism (5) includes a support plate (501), a limiting plate (502), an installation plate (503), a limiting rod (504), a nut (505), a connecting plate (506), and a limiting groove (507). The tops of the multiple support plates (501) are fixedly connected to the installation plates (503). The bottom ends of the portal beam (3) are respectively attached to the tops of the two pressure support blocks (401). The tops of the two pressure support blocks (401) are respectively attached to the tops of the two pressure support blocks (401). Each of the two connecting plates (506) is provided with a connecting plate (506). The bottom end of each connecting plate (506) is provided with multiple limiting grooves (507). The multiple limiting grooves (507) are fitted to the middle part of the portal load-bearing beam (3). Limiting plates (502) are fixedly connected to both sides of each connecting plate (506). Limiting rods (504) are provided at the top of each connecting plate (506). The two limiting rods (504) pass through the multiple connecting plates (506) respectively. Nuts (505) are threaded to both ends of the two limiting rods (504).

10. A gantry crane adaptable to multi-condition lifting operations according to claim 9, characterized in that: The two adjacent support plates (501) are fixedly connected to the two side walls of the pressure support block (401), the bottom ends of the two connecting plates (506) are respectively attached to the top ends of the two pressure support blocks (401), the multiple connecting plates (506) pass through the multiple limiting plates (502), and the multiple nuts (505) are respectively placed on the outside of the multiple connecting plates (506).

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