Wind protection device for a hoisting machine

Abstract

The application relates to a windproof device of a hoisting machine, which comprises a connecting module and a hydraulic module for reducing wind force, the hydraulic module is connected with the hoisting machine and the ground through the connecting module, the hydraulic module comprises a hydraulic cylinder and an accumulator, an oil tank and a first stop valve are connected with the hydraulic cylinder, the hydraulic cylinder, the first stop valve and the accumulator are sequentially connected, the connecting module comprises a first connecting block, a second connecting block, a ground connecting block and a door leg connecting block, the first connecting block and the second connecting block are connected with the hydraulic cylinder respectively, the ground connecting block is connected with the first connecting block, and the door leg connecting block is connected with the second connecting block. Compared with the prior art, the reliability of the windproof device is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of crane safety technology and relates to a windproof device for cranes. Background Technology

[0002] Outdoor lifting machinery, such as gantry cranes, often experience accidents such as sliding along the track or overturning due to wind loads when not in operation, resulting in equipment damage or personal injury. Existing windproof devices mostly adopt the following methods: (1) fixing the lifting machinery to the running track by the friction of the brake, but the friction is affected by the contact surface and often results in insufficient friction; (2) rigidly fixing by anchoring devices, but the anchoring devices or equipment are often damaged by instantaneous strong winds such as typhoons; (3) fixing the lifting machinery by windproof cables (such as steel wire ropes), but the cables often break due to uneven tension or instantaneous strong winds. Therefore, the existing technology has the disadvantage of low device reliability. Summary of the Invention

[0003] The purpose of this invention is to provide a windproof device for lifting machinery to overcome the problem of low reliability of windproof devices.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A windproof device for lifting machinery includes a connecting module and a hydraulic module for mitigating wind force. The hydraulic module is connected to both the lifting machinery and the ground via the connecting module.

[0006] The hydraulic module includes a hydraulic cylinder and an accumulator. The hydraulic cylinder is connected to an oil tank and a first shut-off valve. The hydraulic cylinder, the first shut-off valve, and the accumulator are connected in sequence.

[0007] The connection module includes a first connection block, a second connection block, a ground connection block, and a door leg connection block. The first connection block and the second connection block are respectively connected to a hydraulic cylinder. The ground connection block is connected to the first connection block, and the door leg connection block is connected to the second connection block.

[0008] Furthermore, the hydraulic cylinder includes a hydraulic cylinder piston and a hydraulic cylinder barrel sleeved outside the hydraulic cylinder piston. The hydraulic cylinder piston and the hydraulic cylinder barrel are in movable contact. The hydraulic cylinder piston divides the hydraulic cylinder barrel into a rod chamber and a rodless chamber. The rodless chamber is connected to an oil tank, the rod chamber is connected to a first shut-off valve, the hydraulic cylinder piston is connected to a second connecting block, and the hydraulic cylinder barrel is connected to a first connecting block.

[0009] Furthermore, the hydraulic cylinder piston includes an integrally formed flat plate and a cylindrical rod perpendicular to the flat plate. The flat plate is in movable contact with the hydraulic cylinder barrel. The cylindrical rod is wound with a return spring and is in movable contact with the hydraulic cylinder barrel through a hole provided in the hydraulic cylinder barrel. One end of the return spring is connected to the flat plate and the other end is connected to the hydraulic cylinder barrel.

[0010] Furthermore, the hydraulic module also includes a second shut-off valve for use as an oil circuit switch between different hydraulic cylinders.

[0011] Furthermore, the energy storage device is a diaphragm energy storage device.

[0012] Furthermore, the first connecting block is a plate-shaped structure with a round hole. One end of the first connecting block is fixedly connected to the hydraulic cylinder, and the other end is connected to the ground connecting block through a pin.

[0013] Furthermore, the second connecting block is a plate-shaped structure with a round hole. One end of the second connecting block is fixedly connected to the hydraulic cylinder, and the other end is connected to the door leg connecting block.

[0014] Furthermore, the ground connecting block consists of two parallel T-shaped plate structures with round holes, fixed to the ground.

[0015] Furthermore, the aforementioned door leg connecting block is a plate-shaped structure with round holes, which is fixed to the crane door leg.

[0016] Furthermore, during use, the lifting machinery is equipped with multiple windproof devices connected around its perimeter.

[0017] Compared with the prior art, the present invention has the following characteristics:

[0018] 1. This invention uses a combination of hydraulic cylinder and accumulator to achieve automatic tensioning of windproof steel wire rope and ensure uniform force distribution. At the same time, the accumulator can effectively absorb the instantaneous external force impact of gusts, thus greatly improving the reliability of the device.

[0019] 2. In this invention, the rodless chamber is connected to the oil tank, and the rod chamber is connected to the accumulator. The tension can be adjusted by regulating the hydraulic oil pressure between the rodless chamber and the accumulator. The installation is simple and the operation is convenient.

[0020] 3. When in use, the lifting machinery is equipped with multiple windproof devices along its perimeter to further reduce the impact of wind and improve the reliability of the device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the hydraulic module structure of the present invention;

[0022] Figure 2 This is a front view structural diagram of the connection module of the present invention;

[0023] Figure 3 This is a top view of the connection module of the present invention;

[0024] Figure 4 This is a side view of the connection module of the present invention.

[0025] Figure 5 This is a schematic diagram of an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram comparing the changes of wind load and hydraulic cylinder pressure over time in an embodiment of the present invention, wherein (6a): schematic diagram of the change of wind load over time; (6b): schematic diagram of the change of hydraulic cylinder pressure over time.

[0027] Explanation of markings in the diagram:

[0028] 1—Oil tank, 2—Rodless chamber, 3—Hydraulic cylinder, 4—Rod chamber, 5—Accumulator, 6—First shut-off valve, 7—Second shut-off valve, 8—Second connecting block, 9—Hydraulic cylinder piston, 10—Hydraulic cylinder barrel, 11—First connecting block, 12—Ground connecting block, 13—Door leg connecting block, 14—Windproof steel wire rope, 15—Door leg, 16—Main beam, 17—Trolley, 18—Wheel, 19—Railway. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0030] Example:

[0031] A windproof device for lifting machinery includes a connected hydraulic module and a connecting module.

[0032] See Figure 1 The hydraulic module includes a hydraulic cylinder 3 and an accumulator 5. The hydraulic cylinder 3 is connected to an oil tank 1 and a first shut-off valve 6. The hydraulic cylinder 3, the first shut-off valve 6, and the accumulator 5 are connected in sequence.

[0033] See Figure 2 , Figure 3 and Figure 4 The connection module includes a first connection block 11, a second connection block 8, a ground connection block 12, and a door leg connection block 13. The first connection block 11 and the second connection block 8 are respectively connected to the hydraulic cylinder 3. The ground connection block 12 is connected to the first connection block 11. The door leg connection block 13 is connected to the second connection block 8.

[0034] This invention employs a combination of hydraulic cylinder and accumulator to achieve automatic tensioning of the windproof steel wire rope and ensure uniform force distribution. At the same time, the accumulator can effectively absorb the instantaneous external force impact of gusts, thus greatly improving the reliability of the device.

[0035] Specifically, the hydraulic cylinder 3 includes a hydraulic cylinder piston 9 and a hydraulic cylinder barrel 10 sleeved outside the hydraulic cylinder piston 9. The hydraulic cylinder piston 9 and the hydraulic cylinder barrel 10 are in movable contact. A rod chamber 4 is formed between one end of the hydraulic cylinder piston 9 and the hydraulic cylinder barrel 10, and a rodless chamber 2 is formed between the other end of the hydraulic cylinder piston 9 and the hydraulic cylinder barrel 10. The rodless chamber 2 is connected to the oil tank 1, the rod chamber 4 is connected to the first shut-off valve 6, the hydraulic cylinder piston 9 is connected to the second connecting block 8, and the hydraulic cylinder barrel 10 is connected to the first connecting block 11.

[0036] The present invention connects the rodless chamber to the oil tank and the rod chamber to the accumulator. The tension can be adjusted by adjusting the hydraulic oil pressure between the rodless chamber and the accumulator. It is simple to install and easy to operate.

[0037] Specifically, the hydraulic cylinder piston 9 includes an integrally formed flat plate and a cylindrical rod perpendicular to the flat plate. The flat plate is in movable contact with the hydraulic cylinder barrel 10. The cylindrical rod is wound with a return spring and is in movable contact with the hydraulic cylinder barrel 10 through a hole provided in the hydraulic cylinder barrel 10. One end of the return spring is connected to the flat plate and the other end is connected to the hydraulic cylinder barrel 10.

[0038] More specifically, in this embodiment, the hydraulic cylinder 3 is a single-acting hydraulic cylinder used to tension the windproof steel wire rope 14 and provide the required tension for windproofing.

[0039] Specifically, the hydraulic module also includes a second shut-off valve 7 for serving as an oil circuit switch between the rod chambers 4 of different hydraulic cylinders, and the rod chambers 4 are connected to the second shut-off valve 7.

[0040] More specifically, in this embodiment, both the first shut-off valve 6 and the second shut-off valve 7 are manual shut-off valves. The first shut-off valve 6 is used to close or open the oil passage between the rod chamber 4 of the hydraulic cylinder and the accumulator 5, and the second shut-off valve 7 is used to close or open the oil passage between the rod chambers 4 of different hydraulic cylinders. One end of the first shut-off valve 6 is connected to the rod chamber 4 of the hydraulic cylinder, and the other end is connected to the oil port of the accumulator 5; one end of the second shut-off valve 7 is connected to the rod chamber 4 of the hydraulic cylinder, and the other end has an oil port for connection.

[0041] Specifically, in this embodiment, the accumulator 5 is a diaphragm accumulator 5, which is used to absorb the instantaneous impact force of the windproof steel wire rope 14 and provide pressurized oil to the hydraulic cylinder 3. The oil port of the accumulator 5 is connected to the first shut-off valve 6.

[0042] Specifically, the first connecting block 11 is a plate-shaped structure with a circular hole. One end of the first connecting block 11 is fixedly connected to the cylinder barrel 10 of the hydraulic cylinder, and the other end is connected to the ground connecting block 12 through a pin.

[0043] Specifically, the second connecting block 8 is a plate-shaped structure with a round hole. One end of the second connecting block 8 is fixedly connected to the hydraulic cylinder piston 9, and the other end is connected to the door leg connecting block 13 through the windproof steel wire rope 14.

[0044] Specifically, the ground connecting block 12 consists of two parallel T-shaped plate structures with round holes, fixed to the ground.

[0045] Specifically, the door leg connecting block 13 is a plate-shaped structure with round holes, which is fixed on the crane door leg.

[0046] Specifically, during use, the lifting machinery is equipped with multiple windproof devices connected around its perimeter, which can further reduce the impact of wind and improve the reliability of the device.

[0047] In specific operations, see Figure 5 In this embodiment, a windproof device is installed on each of the four legs of the gantry crane, arranged symmetrically, as follows:

[0048] (1) When the shut-off valve is in the closed state, connect the first connecting block 11 to the ground connecting block 12; connect the second connecting block 8 to the door leg connecting block 13 through the windproof steel wire rope 14.

[0049] (2) After the four windproof devices are connected, manually open the first shut-off valve 6. The high-pressure oil in the accumulator 5 enters the rod chamber 4 of the hydraulic cylinder through the first shut-off valve 6, pushes the piston to retract, and tensions the windproof steel wire rope 14. The windproof device is in the windproof working state.

[0050] (3) Connect the second shut-off valves 7 of the four windproof devices and manually open the second shut-off valves 7 to connect the four accumulators 5 and the rod chambers 4 of the four hydraulic cylinders, so that the pressures are equal and the tension of the four windproof devices is also equal. After waiting for one minute, close the second shut-off valves 7.

[0051] (4) If a steady wind (with a relatively constant wind speed) blows from side B to side A, it can be considered that there is a relatively constant external force causing the crane to tend to move or tilt towards side A. The windproof wire rope 14 on side B tends to tighten, increasing the tension applied to the piston 9 of the hydraulic cylinder of the windproof device on side B. This causes the hydraulic oil pressure between the rodless chamber 2 and the accumulator 5 of the hydraulic cylinder of the windproof device on side B to rise, increasing the tension applied to the gantry leg. Conversely, the windproof wire rope 14 on side A tends to loosen, decreasing the tension applied to the piston 9 of the hydraulic cylinder of the windproof device on side A. This causes the hydraulic oil pressure between the rodless chamber 2 and the accumulator 5 of the hydraulic cylinder of the windproof device on side A to drop, decreasing the tension applied to the gantry leg. The tension on side B increases while the tension on side A decreases, resisting the influence of the steady wind.

[0052] (5) If a gust of wind (with large fluctuations in wind speed) moves from side B to side A, assuming a sudden increase in wind force, this can be considered as an instantaneous external force applied to the crane from side B to side A. The windproof steel wire rope 14 on side B tends to tighten, and the tension applied to the piston 9 of the hydraulic cylinder of the windproof device on side B increases instantaneously, causing the hydraulic oil pressure between the rodless chamber 2 and the accumulator 5 of the hydraulic cylinder of the windproof device on side B to rise instantaneously. Since the accumulator 5 has the ability to absorb instantaneous impacts, the increase in tension applied to the gantry is relatively small. Conversely, the windproof steel wire rope 14 on side A tends to slack, and the tension applied to the piston 9 of the hydraulic cylinder of the windproof device on side A decreases instantaneously, causing the hydraulic oil pressure between the rodless chamber 2 and the accumulator 5 of the hydraulic cylinder of the windproof device on side A to drop instantaneously, and the tension applied to the gantry decreases instantaneously. The tension on side B increases instantaneously by a small amount, while the tension on side A decreases instantaneously, resisting the influence of the external force of the gust of wind.

[0053] (6) The windproof device is miniaturized. With the accumulator 5 having a normal pressure of P = 10MPa, the hydraulic cylinder rodless chamber 2 having a diameter of D = 100mm, and the rod chamber 4 having a diameter of d = 50mm, the windproof device can provide tension force. (Approximately 6 tons)

[0054] (7) See Figure 6 The graph shows the relationship between the wind load and the hydraulic cylinder pressure when the wind load increases instantaneously from 50kN to 100kN. It can be seen that when the wind load increases by 100%, the hydraulic cylinder pressure increases by approximately 0.7 times, effectively resisting the instantaneous impact.

[0055] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A windproof device for lifting machinery, characterized in that, It includes a connection module and a hydraulic module for mitigating wind force. The hydraulic module is connected to the lifting machinery and the ground via the connection module. The hydraulic module includes a hydraulic cylinder (3) and an accumulator (5). The hydraulic cylinder (3) is connected to an oil tank (1) and a first shut-off valve (6). The hydraulic cylinder (3), the first shut-off valve (6), and the accumulator (5) are connected in sequence. The hydraulic cylinder (3) is a single-acting hydraulic cylinder. The connection module includes a first connection block (11), a second connection block (8), a ground connection block (12), and a door leg connection block (13). The first connection block (11) and the second connection block (8) are respectively connected to the hydraulic cylinder (3). The ground connection block (12) is connected to the first connection block (11). The door leg connection block (13) is connected to the second connection block (8). The hydraulic cylinder (3) includes a hydraulic cylinder piston (9) and a hydraulic cylinder barrel (10) sleeved outside the hydraulic cylinder piston (9). The hydraulic cylinder piston (9) and the hydraulic cylinder barrel (10) are in active contact. The hydraulic cylinder piston (9) divides the hydraulic cylinder barrel (10) into a rod chamber (4) and a rodless chamber (2). The rodless chamber (2) is connected to the oil tank (1). The rod chamber (4) is connected to the first shut-off valve (6). The hydraulic cylinder piston (9) is connected to the second connecting block (8). The hydraulic cylinder barrel (10) is connected to the first connecting block (11). One end of the second connecting block (8) is fixedly connected to the hydraulic cylinder piston (9), and the other end is connected to the door leg connecting block (13) through a windproof steel wire rope (14). The hydraulic module also includes a second shut-off valve (7) for use as an oil circuit switch between different hydraulic cylinders.

2. The windproof device for lifting machinery according to claim 1, characterized in that, The hydraulic cylinder piston (9) includes an integrally formed flat plate and a cylindrical rod perpendicular to the flat plate. The flat plate is in contact with the hydraulic cylinder barrel (10). The cylindrical rod is wound with a return spring and is in contact with the hydraulic cylinder barrel (10) through a hole provided in the hydraulic cylinder barrel (10). One end of the return spring is connected to the flat plate and the other end is connected to the hydraulic cylinder barrel (10).

3. A windproof device for lifting machinery according to claim 1, characterized in that, The energy storage device (5) is a diaphragm energy storage device.

4. A windproof device for lifting machinery according to claim 1, characterized in that, The first connecting block (11) is a plate-shaped structure with a round hole. One end of the first connecting block (11) is fixedly connected to the hydraulic cylinder (3), and the other end is connected to the ground connecting block (12) through a pin.

5. A windproof device for lifting machinery according to claim 1, characterized in that, The second connecting block (8) is a plate-shaped structure with a round hole. One end of the second connecting block (8) is fixedly connected to the hydraulic cylinder (3), and the other end is connected to the door leg connecting block (13).

6. A windproof device for lifting machinery according to claim 1, characterized in that, The ground connecting block (12) consists of two parallel T-shaped plate structures with round holes, which are fixed to the ground.

7. A windproof device for lifting machinery according to claim 1, characterized in that, The aforementioned door leg connecting block (13) is a plate-shaped structure with round holes, which is fixed on the crane door leg.

8. A windproof device for lifting machinery according to claim 1, characterized in that, When in use, the lifting machinery is equipped with multiple windproof devices connected around its perimeter.

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