Cable fall protection system for tower crane and tower crane

Abstract

The invention discloses a cable anti-falling system for a tower crane and a tower crane. The cable anti-falling system comprises: a cable receiving device, which is arranged on a tower body of the tower crane and is used for receiving and releasing cables; a limiting device, which is movably arranged on the cable receiving device and is used for limiting the cable receiving device from releasing cables, so as to prevent the cable receiving device from rotating at will, thereby avoiding strain caused by the cable being released by mistake, and ensuring the safety and reliability of the tower crane's electricity use.

Description

Technical Field

[0001] The invention relates to the technical field of crane equipment, and in particular to a cable fall prevention system for a tower crane and a tower crane. Background Art

[0002] In the conventional power supply scheme of tower cranes, the main cable is directly connected from the power supply below the tower crane to the upper part of the tower crane to supply power to the electrical equipment on the upper part of the tower crane. When the power of the electrical equipment on the upper part of the tower crane is large, a very thick main cable is required. It is difficult to manually lay such cables. On the other hand, if the tower crane is high, such as more than one hundred meters, in many construction sites, cables are randomly piled on the lower support or on the ground. If a vertical cable reel system is selected, the cables can be easily stored, reducing the difficulty of workers' operations. However, when the brake of the cable reel system is damaged, or the worker misoperates and causes the reel to be unlocked, the cable on the cable storage device may be accidentally pulled out or the released cable may be too long, which may cause cable strain or cause safety hazards, reducing the reliability of power supply of the tower crane. Summary of the invention

[0003] The purpose of the present invention is to provide a cable anti-falling system for a tower crane and a tower crane. The cable anti-falling system for a tower crane and the tower crane have the advantages of simple structure, being able to freely retract the cable, and preventing the cable of the cable receiving device from being accidentally pulled out.

[0004] In order to achieve the above object, the present invention provides a cable fall prevention system for a tower crane in a first aspect, the cable fall prevention system comprising:

[0005] The cable storage device is arranged on the lower support of the tower crane and is used for collecting and releasing the cables;

[0006] The limiting device is movably arranged on the cable receiving device and is used for limiting the cable receiving device from releasing the cables outside.

[0007] In an embodiment of the present invention, a tower crane comprises:

[0008] A high voltage power supply is arranged on the ground;

[0009] The transformer is installed on the upper part of the tower crane and is connected to the high-voltage power supply through cables. It is used to convert high-voltage electricity into low-voltage electricity.

[0010] In an embodiment of the present invention, the height of the tower crane is greater than 100 m, the installation height of the cable storage device is greater than 90 m, and the outer diameter of the cable ranges from 30 mm to 80 mm.

[0011] In an embodiment of the present invention, the limiting device comprises a follower and a clamping member arranged on one end surface of the cable storage device, and one end of the clamping member is provided with a hook structure for clamping the follower.

[0012] In an embodiment of the present invention, the follower comprises a gear ring and a plurality of ratchets, the gear ring is fixed on one side end surface of the cable storage device, and the plurality of ratchets are arranged on the outer peripheral wall of the gear ring.

[0013] In an embodiment of the present invention, the follower comprises a plurality of follower rods, which are arranged on one side end surface of the cable receiving device and are evenly distributed along the circumference of the cable receiving device.

[0014] In an embodiment of the present invention, both ends of the clamping member can rotate around the middle part, and the limiting device also includes a first magnetic member and a second magnetic member that are electrically connected. The first magnetic member is arranged on the side wall of the clamping member away from the end of the hook structure, and the second magnetic member is arranged on a side end surface of the cable storage device and is opposite to the first magnetic member.

[0015] In an embodiment of the present invention, the limiting device further comprises an elastic member disposed adjacent to the second magnetic member and located on one end surface of the cable receiving device, with one end of the elastic member facing the clamping member.

[0016] In an embodiment of the present invention, the cable fall prevention system further includes a processor electrically connected to the first magnetic member and the second magnetic member, and the processor is configured to:

[0017] Make sure the tower crane is in the non-lifting state;

[0018] The first magnetic component and the second magnetic component are controlled to separate from each other.

[0019] A second aspect of the present invention provides a tower crane, comprising the above-mentioned cable fall prevention system for a tower crane.

[0020] Through the above technical scheme, a movable limiting device is arranged on the cable storage device to limit the cable storage device from rotating freely in the direction of cable release, thereby preventing the cable from being released accidentally. The structure is simple and can also prevent the free vertical cable from being too long and causing strain, thereby ensuring the safety and reliability of the tower crane's electricity use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0022] Figure 1 is a schematic structural diagram of a tower crane according to an embodiment of the present invention;

[0023] Figure 2 : is a partial structural schematic diagram of the cable anti-falling system in an embodiment of the present invention (the follower includes a gear ring and a plurality of ratchets);

[0024] Figure 3 1 is a schematic diagram of a partial structure of a cable fall prevention system according to an embodiment of the present invention from a first perspective (the follower includes a plurality of follower rods);

[0025] Figure 4 1 is a schematic diagram from a second perspective of a partial structure of a cable fall prevention system in an embodiment of the present invention (the follower includes a plurality of follower rods).

[0026] Description of Reference Numerals

[0027] 1 High voltage power supply 2 Transformer

[0028] 3 Cable 4 Cable storage device

[0029] 5 Lower support 6 Limiting device

[0030] 601 Follower 6011 Ring Gear

[0031] 6012 ratchet 6013 follower rod

[0032] 602 Card connector 6021 Card hook structure

[0033] 6022 Incline 6023 Stop surface

[0034] 603 first magnetic member 604 second magnetic member

[0035] 605 Elastic Parts DETAILED DESCRIPTION

[0036] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0037] In a specific embodiment of the present invention, a cable anti-falling system for a tower crane is provided, which uses a cable receiving device 4 and a braking device 6, wherein Figure 1As shown, the cable receiving device 4 is arranged on the tower body of the tower crane, and is used to receive and release the cable 3; the braking device 6 is movably arranged on the cable receiving device 4, and is used to limit the cable receiving device 4 from releasing the cable 3. Specifically, the cable receiving device 4 in this embodiment is arranged on the lower support 5 of the tower crane and is fixed relative to the transformer device 2, so as to prevent the cable 3 from passing through the slewing device located above the lower support 7, causing the cable 3 to be entangled on the slewing device. In addition, the cable storage device 4 is a reel, and the cable 3 is wound on the reel, and the lower end of the cable 3 is connected to the power supply on the ground, and the upper end of the cable 3 is wound around the reel and connected to the electrical equipment on the upper part of the tower crane. The cable storage device 4 can regularly and orderly store and release the cables 3 vertically lowered from a high place to avoid the clutter of the lines of the cables 3. A movable limiting device 6 is provided on the cable storage device 4 to limit the arbitrary rotation of the cable storage device in the direction of cable release, thereby preventing the cable 3 from being accidentally released. The structure is simple, and the free vertical cable 3 can be prevented from being stretched due to excessive length, thereby ensuring the safety and reliability of the tower crane's electricity use.

[0038] In one embodiment of the present invention, a tower crane comprises: a high voltage power supply 1 and a transformer 2, wherein the high voltage power supply 1 is arranged on the ground; the transformer 2 is arranged on the upper part of the tower of the tower crane and connected to the high voltage power supply 1 through a cable 3, and is used to convert high voltage electricity into low voltage electricity. Specifically, when the lifting moment of the tower crane is large and the height is high (such as the lifting moment is greater than 2000 tons and the height is greater than 100 meters), a high-power motor or control device needs to be arranged on the upper part of the tower crane. At this time, if the power supply scheme of an ordinary tower crane is adopted, that is, a low voltage power supply (such as 380V) is arranged on the ground, and ordinary cables are used to supply power to the electrical equipment at the top of the tower crane, for example, if the current demand of the electrical equipment is 1600A, the number of ordinary cables 3 required is in the range of 10-20. In the case of a high height of the tower crane, such a number of cables 3 will lead to difficult on-site wiring and complicated lines, high cost, and greatly increase the wiring workload of the staff. In this embodiment, a cable 3 for transmitting high voltage electricity (i.e., a high-voltage cable) is used to connect the high-voltage power supply 1 and the transformer 2. Only a small amount of cables 3 can be used to transmit the high voltage electricity from the ground to the upper part of the tower crane, and the high voltage electricity is converted into low voltage electricity through the transformer 2 to meet the electricity demand of the upper electrical equipment of the large tower crane, thereby reducing the number and cost of cables 3 used, reducing the voltage drop, reducing the line loss, and saving energy.

[0039] Specifically, the high-voltage power supply 1 in this embodiment is provided by a switch cabinet arranged on the ground, and the switch cabinet can also control the power supply or power outage of the high-voltage electricity; the power transformer 2 is a box-type substation, and an installation platform is arranged on the lower support 5, the slewing device, the upper support, the balance arm or the lifting arm of the tower crane, and the box-type substation is arranged on the installation platform, so that the high-voltage electricity (such as 10KV) from the ground is converted into low-voltage electricity (380V) to directly meet the power demand of the upper electrical equipment of the tower crane. In the case of a high height of the tower crane, this power supply method only needs to use a cable 3 for transmitting high-voltage electricity to transmit the high-voltage electricity from the ground to the upper part of the tower crane, which ensures the operating stability of the power supply system of the large tower crane, and greatly reduces the wiring difficulty of the cable 3, reduces the wiring workload of the staff, and improves the wiring efficiency. However, when adopting the above technical solution, it is necessary to set a very long high-voltage cable (such as a length greater than 100 meters) on the upper part of the tower and retract and release it through the cable storage device 4. However, when the brake of the cable storage device 4 is damaged, or the staff misoperates it so that the cable storage device 4 is not locked, the cable 3 on the cable storage device 4 may be accidentally pulled out or the released cable 3 may be too long, which may cause the cable to be strained or cause safety hazards, reducing the power reliability of the tower crane. Therefore, it is necessary to use the cable anti-fall system provided in this embodiment to prevent the cable 3 on the cable storage device 4 from being accidentally released.

[0040] Furthermore, if the cable 3 of the main power supply is thicker, resulting in a larger weight per unit length of the cable 3, if the cable 3 released from the reel is too long, the weight of the cable 3 itself is too large, which may cause the cable 3 to be strained due to excessive tension; in addition, the tension brought by the long free vertical cable 3 will also be transmitted to the reel. If the reel is to withstand the above pressure, it is necessary to install a high-power motor (such as 15KW-20KW) or a brake, resulting in energy consumption. Therefore, in this embodiment, a limiting device 6 is provided on the cable receiving device 4 to limit the cable receiving device 4 from rotating outward, so as to limit the cable 3 wound on the cable receiving device 4 from being mistakenly released, and to avoid the cable 3 released from the cable receiving device 4 being too long or too heavy, thereby ensuring the safety and reliability of the tower crane's electricity use. In addition, after adopting the above method, the power range of the motor driving the reel in this embodiment is 3KW-5KW, which saves energy while ensuring the performance of the reel.

[0041] In one embodiment of the present invention, the height of the tower crane is greater than 100m, and the height of the cable storage device 4 is greater than 90m. In this embodiment, if the height of the tower crane adopts the power supply method of a conventional crane (i.e., electricity is transmitted to the upper part of the tower crane through ordinary cables), the wiring difficulty and wiring workload of the staff are large, and the wiring efficiency is low. The use of the cable storage device 4 can reduce the difficulty of cable collection and release, facilitate the neat collection of the cable 3, and reduce the probability of accidental damage to the cable 3. Therefore, a limiting device 6 is set on the cable storage device 4 to limit the rotation direction of the cable storage device 4 to ensure that the cable storage device 4 can be freely collected under the tower lowering condition; in other cases, the cable 3 is prevented from being accidentally released from the cable storage device 4, thereby causing the cable 3 to be seriously strained or causing more serious accidents; in the jacking state, the control device of the tower crane will receive the jacking state information, and then control the limiting device 6 to be remotely opened to achieve the purpose of free cable release in the jacking state.

[0042] In one embodiment of the present invention, the outer diameter range of the cable 3 is 30mm-80mm. In order to ensure that the tower crane can meet the power requirements of the upper electrical equipment and the voltage drop of the cable 3 is less than 5%, it is further preferred in this embodiment that the outer diameter range of the cable 3 is 50mm-80mm. However, the weight of the cable 3 in this outer diameter range also increases. Therefore, in order to prevent the free vertical cable 3 from being overweight and causing strain, and to avoid excessive tension on the cable storage device 4, the rotation of the cable storage device 4 should be restricted to prevent the cable 3 from being accidentally released.

[0043] In one embodiment of the present invention, the limiting device 6 includes a follower 601 and a clamping member 602 arranged on one side end face of the cable storage device 4, wherein the follower 601 is fixed on one side end face of the cable storage device 4 and can rotate with the rotation of the cable storage device 4, and the clamping member 602 is stationary relative to the cable storage device 4, and one end of the clamping member 602 is provided with a hook structure 6021 for clamping the follower 601. If it is necessary to release the cable 3 externally, the hook structure 6021 is separated from the follower 601, and the cable storage device 4 can be rotated at will; if it is not necessary to release the cable 3 externally, the hook structure 6021 is tightly clamped to the follower 601 to prevent the cable storage device 4 from rotating at will and causing the cable 3 to be released externally.

[0044] In one embodiment of the present invention, Figure 2As shown, the follower 601 includes a toothed ring 6011 and a plurality of ratchets 6012, the toothed ring 6011 is fixed on one side end face of the cable receiving device 4, and the plurality of ratchets 6012 are arranged on the outer peripheral wall of the toothed ring 6011, and the toothed ring 6011 and the ratchets 6012 can rotate with the rotation of the cable receiving device 4. When the hook structure 6021 on the clamping member 602 is clamped on the ratchet 6012, the cable receiving device 4 can only rotate in one direction, but cannot rotate in both directions at will. Specifically, in this embodiment, when the hook structure 6021 is clamped on the ratchet 6012, the cable receiving device 4 can only rotate in the direction of recovering the cable 3, but cannot rotate in the direction of releasing the cable 3, which can effectively prevent the cable 3 from being released at will and causing accidental strain. For example, when a strong wind is generated in the sky, a large stress may be generated when the strong wind blows over the cable 3. If the rotation of the cable receiving device 4 is not restricted, this stress may forcibly pull the cable 3 out and cause the cable 3 to be strained.

[0045] In another embodiment of the present invention, Figure 3-Figure 4 As shown, the follower 601 includes a plurality of follower rods 6013, which are arranged on one side end surface of the cable receiving device 4 and are evenly distributed along the circumference of the cable receiving device 4. Specifically, the follower rod 6013 in this embodiment is a support rod connecting the inner peripheral wall and the outer peripheral wall of the cable receiving device 4, and can rotate with the rotation of the cable receiving device 4. A gap is formed between two adjacent follower rods 6013. When the hook structure 6021 on the clamping member 602 is clamped between two adjacent follower rods 6013, the cable receiving device 4 can only rotate within a smaller angle range, so that the rotation of the cable receiving device 4 in the cable releasing direction is restricted, thereby preventing the cables 3 on the cable receiving device 4 from being released at will.

[0046] In one embodiment of the present invention, both ends of the clamping member 602 can rotate around the middle part, and the limiting device 6 also includes a first magnetic member 603 and a second magnetic member 604 that are electrically connected. The first magnetic member 603 is arranged on the side wall of the clamping member 602 away from the hook structure 6021, and the second magnetic member 604 is arranged on a side end surface of the cable storage device 4 and is opposite to the first magnetic member 603. Specifically, the limiting device 6 also includes a fixed shaft vertically arranged on one side end face of the cable storage device 4, and a through hole is formed in the middle part of the clamping part 602 to be installed and matched with the fixed shaft, so that the two ends of the clamping part 602 can rotate around the middle part; the first magnetic part 603 and the second magnetic part 604 are both at the end away from the hook structure 6021. When the first magnetic part 603 and the second magnetic part 604 are energized, an attractive force is generated between the first magnetic part 603 and the second magnetic part 604, so that the first magnetic part 603 and the second magnetic part 604 are attracted to each other, and the two ends of the clamping part 602 can rotate around the middle part so that the hook mechanism disengages from the follower 601. At this time, the cable storage device 4 can be rotated at will to release or recycle the cable 3.

[0047] In one embodiment of the present invention, the limiting device 6 further includes an elastic member 605 disposed adjacent to the second magnetic member 604, with one end of the elastic member 605 facing the clamping member 602. Specifically, the elastic member 605 has a fixed end and a free end, and the fixed end is stationary relative to the cable storage device 4. When the first magnetic member 603 and the second magnetic member 604 are powered on, the elastic member 605 is compressed, and the free end abuts against the side wall of the clamping member 602; when the first magnetic member 603 and the second magnetic member 604 are powered off, the first magnetic member 603 and the second magnetic member 604 have no attraction, so that the first magnetic member 603 and the second magnetic member 604 are separated from each other, and the elastic member 605 is extended to release the internal pressure, thereby pushing the clamping member 602 to rotate, so that the hook mechanism clamps the follower 601, preventing the cable storage device 4 from rotating in the cable release direction at will. In addition, the hook structure 6021 in this embodiment has an inclined surface 6022 facing the collecting direction. Under the cooperation of the inclined surface 6022 and the elastic member 605, the cable storage device 4 can rotate in the collecting direction at will, and the limiting device 6 automatically resets to the locked state after the rotation is completed; the hook structure 6021 also has a stop surface 6023 adjacent to the inclined surface 6022, and the stop surface 6023 can prevent the cable storage device 4 from rotating in the cable releasing direction in the locked state. Further, the elastic member 605 in this embodiment includes at least one of elastic elements such as a mechanical spring, a gas spring, a rubber elastic band or a hydraulic support rod.

[0048] In one embodiment of the present invention, the cable fall prevention system further includes a processor electrically connected to the first magnetic member 603 and the second magnetic member 604, and the processor is configured to:

[0049] Make sure the tower crane is in the non-lifting state;

[0050] The first magnetic member 603 and the second magnetic member 604 are controlled to separate from each other.

[0051] Specifically, the jacking system of the tower crane used to perform the jacking operation will send a jacking signal to the processor before performing the jacking operation (if the jacking system does not perform the jacking operation, it will not send a jacking signal to the processor). If the processor does not receive the jacking signal, it can be determined that the tower crane is in a non-jacking state; further, when the tower crane is in a non-jacking state, the cable 3 should be prohibited from being released, and the cable storage device 4 cannot rotate arbitrarily at this time; at this time, the processor must control the power to be cut off between the first magnetic member 603 and the second magnetic member 604, and the elastic member 605 to extend, so that the hook structure 6021 is tightly stuck on the follower 601.

[0052] During the lifting operation, the lower end and the upper end of the cable 3 are fixed respectively (wherein the lower end of the cable 3 is fixed on the standard section 8, and the upper end is fixed on the cable storage device 4). If the operator makes a mistake (i.e. the operator does not pre-place a sufficient length of cable 3 before the lifting operation), the length of the free vertical cable 3 in the middle is less than the lifting height, which will cause the middle cable 3 to be overstretched and cause strain. To avoid the above situation, after receiving the lifting signal, the processor can determine that the tower crane is in the lifting state, and then control the first magnetic member 603 and the second magnetic member 604 to be energized, and the elastic member 605 is compressed, so that the hook structure 6021 is separated from the follower 601.

[0053] A second aspect of the present invention provides a tower crane, comprising the above-mentioned cable fall prevention system for a tower crane.

[0054] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any appropriate manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A cable fall prevention system for a tower crane, characterized in that: The cable fall prevention system comprises: A cable storage device (4) is arranged on the lower support (5) of the tower crane and is used for storing and releasing the cable (3); A limiting device (6) is movably arranged on the cable storage device (4) and is used to limit the cable storage device (4) from releasing the cable (3). The limiting device (6) comprises a follower (601) and a clamping member (602) arranged on one end surface of the cable storage device (4). The follower (601) can rotate with the cable storage device (4). One end of the clamping member (602) is provided with a clamping hook structure (6021) for clamping the follower (601). Both ends of the clamping member (602) can rotate around the middle part, and the limiting device (6) also includes a first magnetic member (603) and a second magnetic member (604) which are electrically connected, wherein the first magnetic member (603) is arranged on a side peripheral wall of the clamping member (602) at one end away from the hook structure (6021), and the second magnetic member (604) is arranged on a side end surface of the cable storage device (4) and is opposite to the first magnetic member (603); The cable fall prevention system further comprises a processor electrically connected to the first magnetic member (603) and the second magnetic member (604), wherein the processor is configured to: Determining that the tower crane is in a non-lifting state, and controlling the first magnetic member (603) and the second magnetic member (604) to separate from each other; It is determined that the tower crane is in a jacking state, and the first magnetic component (603) and the second magnetic component (604) are controlled to be energized.

2. The cable fall prevention system for a tower crane according to claim 1, characterized in that: The tower crane comprises: A high voltage power supply (1) is arranged on the ground; The power conversion device (2) is arranged on the upper part of the tower body of the tower crane and is connected to the high-voltage power source (1) via a cable (3) and is used for converting high-voltage electricity into low-voltage electricity.

3. The cable fall prevention system for a tower crane according to claim 1, characterized in that: The height of the tower crane is greater than 100 m, the installation height of the cable storage device (4) is greater than 90 m, and the outer diameter of the cable (3) ranges from 30 mm to 80 mm.

4. The cable fall prevention system for a tower crane according to claim 1, characterized in that: The follower (601) comprises a gear ring (6011) and a plurality of ratchet teeth (6012); the gear ring (6011) is fixed on a side end face of the cable storage device (4); and the plurality of ratchet teeth (6012) are arranged on the outer peripheral wall of the gear ring (6011).

5. The cable fall prevention system for a tower crane according to claim 1, characterized in that: The follower (601) comprises a plurality of follower rods (6013), and the plurality of follower rods (6013) are arranged on a side end surface of the cable storage device (4) and are evenly distributed along the circumference of the cable storage device (4).

6. The cable fall prevention system for a tower crane according to claim 1, characterized in that: The limiting device (6) further comprises an elastic member (605) arranged adjacent to the second magnetic member (604) and located on one end surface of the cable storage device (4), with one end of the elastic member (605) facing the clamping member (602).

7. A tower crane, characterized in that: The tower crane comprises the cable fall prevention system for a tower crane according to any one of claims 1-6.

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