Tower crane with safety braking device

Abstract

The utility model relates to the field of tower cranes, in particular to a tower crane with a safety braking device. The tower crane comprises a tower crane body and at least two manual switches. The tower crane comprises a standard section, a cargo boom, a balance arm, a control room and an electric control cabinet, the cargo boom, the balance arm, the control room and the electric control cabinet are mounted on the standard section, a luffing mechanism is mounted on the cargo boom, a hoisting mechanism is mounted on the balance arm, and the electric control cabinet is used for supplying power to the luffing mechanism and the hoisting mechanism. The manual switches capable of directly disconnecting the power supply of the main line are mounted around the luffing mechanism and the hoisting mechanism, so that maintenance personnel can directly and timely perform power-off operation according to actual conditions, the safety of the maintenance personnel during working is effectively improved, meanwhile, a control room can also perform power-off operation, the power-off operation and the power-off operation do not influence each other, and the maintenance efficiency is improved. The overall safety of the device is improved, and the problem that an existing tower crane cannot be shut down emergently when the motor is maintained due to the fact that the installation interval between the motor and the motor switch is far is solved.

Description

Technical Field

[0001] This application relates to the field of tower cranes, and in particular to a tower crane equipped with a safety braking device. Background Technology

[0002] In the construction industry, tower cranes are crucial lifting equipment, responsible for transporting building materials and tools from the ground to high-rise buildings for construction workers. Routine maintenance and repair of tower cranes are essential for their safe operation. During maintenance, personnel frequently need to operate the motors of the luffing and hoisting mechanisms on the boom and counterweight boom, which are powered by the control cabinet. They also need to apply lubricating oil to the mechanisms and check their operation. Typically, maintenance personnel and the operator work as a team: one applies lubricating oil or performs test runs on the mechanisms, while the other controls the motor switches in the cab. However, since the motor control devices are located in the cab, and the motor mechanisms are mounted on the boom and counterweight boom at a certain distance from the cab, there are instances where braking may not be timely.

[0003] 1. In the event of an emergency requiring the motor to be stopped during maintenance, the distance is too great, especially since the hoisting mechanism motor is located above and behind the cab, making it difficult for the operator to see the abnormality and react immediately. 2. During maintenance, walkie-talkies or shouting are typically used to instruct the operator to start or stop the mechanism. However, the operator often receives delayed commands, making it impossible to stop operation immediately in an emergency. 3. The mechanism generates significant noise during operation, which directly impacts communication between maintenance personnel and the operator, potentially leading to safety accidents.

[0004] There is currently no effective solution to the problem that existing tower cranes cannot be shut down in an emergency during motor maintenance due to the long installation distance between the motor and the motor switch. Utility Model Content

[0005] This invention provides a tower crane equipped with a safety braking device to solve the problem that existing tower cranes cannot be stopped in an emergency during motor maintenance due to the long installation distance between the motor and the motor switch.

[0006] This utility model provides a tower crane equipped with a safety braking device, which includes the tower crane and at least two manual switches. The tower crane includes a standard section and a jib, a counterweight jib, a control room, and an electrical control cabinet mounted on the standard section. A luffing mechanism is mounted on the jib, and a hoisting mechanism is mounted on the counterweight jib. The electrical control cabinet supplies power to the luffing mechanism and the hoisting mechanism. At least one manual switch is mounted on the jib, and at least one manual switch is mounted on the counterweight jib. Each manual switch is connected in series with a wire in the power supply line of the contactor in the electrical control cabinet.

[0007] Furthermore, each manual switch includes a manual pull rope switch and a safety pull rope. One end of the safety pull rope is connected to the connector of the manual pull rope switch, and the other end of the safety pull rope is fixed to the lifting boom or counterweight boom. The manual pull rope switch is fixed to the lifting boom or counterweight boom, and the manual pull rope switch and the safety pull rope of each manual switch are installed on the same straight line.

[0008] Furthermore, the traction end of the safety protection rope is located within 0-2 meters around the luffing mechanism or hoisting mechanism.

[0009] Furthermore, the traction end of the safety protection rope is located within 0-1 meters around the luffing mechanism or hoisting mechanism.

[0010] Furthermore, the safety protection rope is a steel wire rope.

[0011] Furthermore, the safety pull cord cover is equipped with an anti-slip sleeve.

[0012] Furthermore, the length of the safety protection pull rope is 0.1-2 meters, and the manual pull rope switch is connected to the safety protection pull rope when it is straightened and tightened.

[0013] Furthermore, it includes four manual switches: two manual switches are installed on both sides of the boom, and two manual switches are installed on both sides of the counterweight boom. Each manual switch is connected in series with the power supply line of the contactor in the electrical control cabinet via wires.

[0014] Furthermore, the manual switch is a push-button switch, which is installed on the lifting boom or counterweight boom and connected in series with the power supply line of the contactor in the electrical control cabinet via wires.

[0015] Furthermore, the manual switch is a rotary switch, which is installed on the lifting boom or counterweight boom and connected in series with the power supply line of the contactor in the electrical control cabinet via wires.

[0016] Compared with related technologies, the present invention has the following beneficial effects:

[0017] 1. This application improves the safety of maintenance personnel by installing manual switches around the luffing mechanism and hoisting mechanism that can directly disconnect the main power supply, allowing maintenance personnel to control the manual switches to perform timely power-off operations according to the actual situation. It also solves the problem that existing tower cranes cannot be shut down in an emergency during motor maintenance due to the long installation distance between the motor and the motor switch.

[0018] 2. Manual switches are installed on both sides of the luffing mechanism on the boom and on both sides of the hoisting mechanism on the counterweight boom. This allows maintenance personnel to pull the safety rope to cut off the power to the control cabinet from anywhere within the luffing or hoisting mechanism's operating range. This ensures timely power cut-off of the motors of both the luffing and hoisting mechanisms, allowing maintenance personnel to directly control the manual switches to cut off power as needed, effectively improving their safety during operation.

[0019] 3. The external anti-slip sleeve for fixing the safety protection rope can reduce the difficulty for maintenance personnel to pull the safety protection rope and improve its operability.

[0020] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of the tower crane;

[0022] Figure 2 yes Figure 1 A schematic diagram of a partial structure of a tower crane from a top-down view of the hoisting mechanism;

[0023] Figure 3 yes Figure 1 A schematic diagram of a partial structure of a tower crane from a top-down view of the luffing mechanism;

[0024] Figure 4 This is a schematic diagram of the connection between the pull-cord switch assembly and the electrical control cabinet circuit. Figure 1 ;

[0025] Figure 5 This is a schematic diagram of the connection between the pull-cord switch assembly and the electrical control cabinet circuit. Figure 2 . Detailed Implementation

[0026] To better understand the purpose, technical solution, and advantages of this application, the application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0027] Unless otherwise defined, the technical or scientific terms used in this application shall have the general meaning understood by one of ordinary skill in the art to which this application pertains. Words such as “a,” “an,” “an,” “the,” “the,” and “these” used in this application do not indicate quantitative limitation and may be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a system, product, or device that includes modules (units) is not limited to the listed modules (units) but may include unlisted modules (units) or other modules (units) inherent to such products or devices. The terms “connected,” “linked,” and “coupled” used in this application are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, or B alone. Normally, the character " / " indicates that the objects before and after it are in an "or" relationship. The terms "first," "second," "third," etc., used in this application are merely to distinguish similar objects and do not represent a specific order of objects.

[0028] This embodiment provides a tower crane equipped with a safety braking device, see reference. Figure 1 It includes a tower crane 1 and at least two manual switches.

[0029] The tower crane 1 includes standard sections and a jib, counterweight jib, control room, and electrical control cabinet 2 mounted on the standard sections. A luffing mechanism 11 is mounted on the jib, and a hoisting mechanism 12 is mounted on the counterweight jib. The electrical control cabinet 2 supplies power to the luffing mechanism 11 and the hoisting mechanism 12. The electrical control cabinet 2 is installed on the side of the counterweight jib closest to the operator's cab. Both the luffing mechanism 11 and the hoisting mechanism 12 are driven by motors, which are generally controlled from the control room. In existing tower crane operations, the operator sits in the control room, while maintenance personnel are located at the luffing mechanism 11 or hoisting mechanism 12. The operator controls the motors of the luffing mechanism 11 or hoisting mechanism 12 through the control room to assist maintenance personnel in inspection and maintenance. When a motor malfunctions, the stopping speed depends on the operator's reaction. However, the hoisting mechanism 12 is in the operator's blind spot, resulting in the operator's reaction to cut off the power being consistently delayed. This is a defect in the existing technology. Through the applicant's research, it was found that the cause of this defect is that the distance between the motor at the luffing mechanism 11 or hoisting mechanism 12 and the motor control switch is too great, preventing maintenance personnel who can react immediately from cutting off the power in time. This is the defect in the existing technology. To address this defect, the applicant has researched a tower crane equipped with a safety braking device, which can eliminate the defects of the existing technology.

[0030] In this design, at least one manual switch is installed on the crane boom, and at least one manual switch is installed on the counterweight boom. All manual switches are connected in series with the contactor's power supply line in the electrical control cabinet 2 via wire 4. Several types of manual switches can be used; the first type is a combination of... Figure 2 and Figure 3This tower crane equipped with a safety braking device includes four manual switches: two on each side of the boom and two on each side of the counterweight boom. Each manual switch is connected in series via wire 4 to the power supply line of the contactor in the electrical control cabinet 2. Each manual switch includes a manual pull rope switch 31 and a safety protection pull rope 32. One end of the safety protection pull rope 32 is connected to the connector of the manual pull rope switch 31, and the other end is fixed to the boom or counterweight boom. The manual pull rope switch 31 is also fixed to the boom or counterweight boom, and both the manual pull rope switch 31 and the safety protection pull rope 32 are installed in a straight line. The traction end of the safety protection pull rope 32 is located within 0-2 meters of the luffing mechanism 11 or the hoisting mechanism 12, or within 0-1 meters. In use, simply pulling the safety protection pull rope 32 at any position will trigger the manual pull rope switch 31, thereby disconnecting the power supply line and the power supply to the electrical control cabinet 2, thus enabling timely safety protection operation. The safety pull rope 32 is a steel wire rope. An anti-slip sleeve can be fitted over the safety pull rope 32 to reduce the difficulty of gripping it. This reduces the difficulty for maintenance personnel to pull the safety pull rope 32 and improves its operability. Furthermore, the length of the safety pull rope 32 is 0.1-2 meters, and the manual pull rope switch 31 is taut and connected to the safety pull rope 32 to ensure that the safety pull rope 32 is always taut, guaranteeing that the power-off function will be triggered normally when the maintenance personnel pull it. The cable pull switch, commonly known as an "emergency stop switch," is used to stop the conveyor when it needs to be stopped on a belt conveyor. It is divided into two types: automatic reset and manual reset. Automatic reset: After activation, it automatically returns to the initial position, but may cause erroneous startup. Manual reset: After activation, it has a self-locking device that keeps it in the operating position; manual operation of the reset handle is required to return it to the initial position. The cable pull switch is an essential safety protection device for belt conveyors, preventing accidents from escalating and causing significant losses. Due to its convenient installation and reliable switching, it is widely used in belt conveyor applications. In this application, after research, the applicant selected a manually reset pull rope switch as the manual pull rope switch 31 in the application document because it has a self-locking device, making it safer and more reliable. Furthermore, tests have proven that the manual pull rope switch 31 and the safety protection pull rope 32 perform well on tower cranes, and are not limited to belt conveyors. The second type is a push-button switch, installed on the lifting boom or counterweight boom, and connected in series with the power supply line of the contactor in the electrical control cabinet 2 via wire 4. The third type is a rotary switch, installed on the lifting boom or counterweight boom, and connected in series with the power supply line of the contactor in the electrical control cabinet 2 via wire 4.

[0031] Combination Figure 4 and Figure 5The circuit connection structure of this application is explained below. See also... Figure 4 , Figure 4 This is a schematic diagram of the power supply line structure for the luffing mechanism 11, the hoisting mechanism 12, and the slewing mechanism. Since the slewing mechanism is not involved in the technical solution of this application, it can be omitted here. In this power supply line structure diagram, the main contact point (KM) of the main starter contactor controls the on / off state of the entire circuit. (See reference...) Figure 5 , Figure 5 To control the secondary circuit (power supply line) of the main contact point (KM) of the main starter contactor, i.e. the control circuit, the pull rope switch contact (S1) at the luffing mechanism and the pull rope switch contact (S2) at the hoisting mechanism in the control circuit are connected in series with the main starter contactor (KM2). When either the pull rope switch contact (S1) or the pull rope switch contact (S2) is disconnected, the main starter contactor (KM2) will be disconnected, thereby causing the control circuit to control the main contact point (KM) of the main starter contactor to be disconnected, thereby disconnecting the power supply lines of the luffing mechanism 11, the hoisting mechanism 12 and the slewing mechanism, and finally realizing the power outage operation. After disconnection, the manual pull rope switch 31 needs to be manually reset.

[0032] The effects of the above structure are as follows: If maintenance personnel feel the need to cut off the power, they can pull the safety rope 32 at any position, press the button switch, or rotate the knob switch. Under the traction of the safety rope 32, the normally closed contact of the manual rope switch 31 will be disconnected. Since the normally closed contact is connected in series with the control circuit, after disconnecting the normally closed contact of the manual rope switch 31, the main start contactor (KM2) will be disconnected, thereby causing the control circuit to control the main contact point (KM) of the main start contactor to open, thus disconnecting the power supply lines of the luffing mechanism 11, the hoisting mechanism 12, and the slewing mechanism, ultimately achieving timely power outage. This application, by installing manual switches around the luffing mechanism 11 and the hoisting mechanism 12 that can directly disconnect the power supply to the main line (electrical control box), allows maintenance personnel to directly and timely cut off the power according to the actual situation. Maintenance personnel do not need to communicate with the operator, effectively improving the safety of maintenance personnel during work. At the same time, the control room can also perform power outage operations without affecting each other, improving the overall safety of the device. Moreover, the device has a simple structure, making it easy to install, use, and promote. This solves the problem of existing tower cranes being unable to be shut down in an emergency during motor maintenance due to the long installation distance between the motor and the motor switch.

[0033] The manual switch can be installed on the boom or counterweight boom and located within the range of movement of maintenance personnel in the luffing mechanism 11 or hoisting mechanism 12, thus facilitating the operation of the switch by maintenance personnel.

[0034] In summary, this application, by installing manual switches around the luffing mechanism 11 and hoisting mechanism 12 that can directly disconnect the main power supply, allows maintenance personnel to directly and promptly cut off the power according to the actual situation, effectively improving the safety of maintenance personnel during work. Simultaneously, the control room can also perform power-off operations without interference, thus improving the overall safety of the device. Manual switches are installed on both sides of the luffing mechanism 11 on the boom and on both sides of the hoisting mechanism 12 on the counterweight boom, allowing maintenance personnel to control the power supply from anywhere within the range of motion of the luffing mechanism 11 or the hoisting mechanism 12. The safety protection rope 32 can be pulled at any point within the operating range to cut off the power to the electrical control cabinet 2, thereby enabling timely power cut-off of the motors of the luffing mechanism 11 and the hoisting mechanism 12. This allows maintenance personnel to directly control the manual switch to perform timely power cut-off operations according to the actual situation, effectively improving the safety of maintenance personnel during work and solving the problem that existing tower cranes cannot be shut down in an emergency during motor maintenance due to the long installation distance between the motor and the motor switch. The external fixed anti-slip sleeve of the safety protection rope 32 can reduce the difficulty for maintenance personnel to pull the safety protection rope 32 and improve the operability; it also improves the flexibility and fault tolerance of the device.

[0035] It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. All other embodiments derived by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0036] Obviously, the accompanying drawings are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar situations based on these drawings without any creative effort. Furthermore, it is understood that although the work done in this development process may be complex and lengthy, for those skilled in the art, certain design, manufacturing, or production modifications made based on the technical content disclosed in this application are merely conventional technical means and should not be considered as insufficient disclosure of this application.

Claims

1. A tower crane equipped with a safety braking device, comprising: Tower crane (1), tower crane (1) includes a standard section and a lifting arm, a counterweight arm, a control room and an electrical control cabinet (2) installed on the standard section. A luffing mechanism (11) is installed on the lifting arm and a hoisting mechanism (12) is installed on the counterweight arm. The electrical control cabinet (2) is used to supply power to the luffing mechanism (11) and the hoisting mechanism (12). The feature is that it also includes at least two manual switches, at least one manual switch is installed on the lifting arm, at least one manual switch is installed on the counterweight arm, and each manual switch is connected in series in the power supply line of the contactor of the electrical control cabinet (2) via wires (4).

2. The tower crane equipped with a safety braking device according to claim 1, characterized in that, Each manual switch includes a manual pull rope switch (31) and a safety protection pull rope (32). One end of the safety protection pull rope (32) is connected to the connector of the manual pull rope switch (31), and the other end of the safety protection pull rope (32) is fixed to the lifting boom or counterweight boom. The manual pull rope switch (31) is fixed to the lifting boom or counterweight boom, and the manual pull rope switch (31) and the safety protection pull rope (32) of each manual switch are installed on the same straight line.

3. The tower crane equipped with a safety braking device according to claim 2, characterized in that, The traction end of the safety protection rope (32) is located within 0-2 meters around the luffing mechanism (11) or the hoisting mechanism (12).

4. The tower crane equipped with a safety braking device according to claim 2, characterized in that, The traction end of the safety protection rope (32) is located within 0-1 meters around the luffing mechanism (11) or the hoisting mechanism (12).

5. The tower crane equipped with a safety braking device according to claim 2, characterized in that, The safety protection rope (32) is a steel wire rope.

6. The tower crane equipped with a safety braking device according to claim 2, characterized in that, The safety protection pull rope (32) has an anti-slip sleeve.

7. The tower crane equipped with a safety braking device according to claim 2, characterized in that, The length of the safety protection pull rope (32) is 0.1-2 meters, and the manual pull rope switch (31) is connected to the safety protection pull rope (32) when it is straightened and tightened.

8. The tower crane equipped with a safety braking device according to claim 1, characterized in that, It includes four manual switches. Two manual switches are installed on both sides of the lifting boom and two manual switches are installed on both sides of the counterweight boom. Each manual switch is connected in series with the power supply line of the contactor in the electrical control cabinet (2) via wire (4).

9. The tower crane equipped with a safety braking device according to claim 1, characterized in that, The manual switch is a push-button switch, which is installed on the lifting arm or counterweight arm. The push-button switch is connected in series with the power supply line of the contactor in the electrical control cabinet (2) via wire (4).

10. The tower crane equipped with a safety braking device according to claim 1, characterized in that, The manual switch is a rotary switch, which is installed on the lifting boom or counterweight boom. The rotary switch is connected in series with the power supply line of the contactor in the electrical control cabinet (2) via wire (4).

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