An overload working system and mechanical equipment

Abstract

The application provides an overload working system and mechanical equipment, and relates to the technical field of mechanical equipment.The overload working system of the application can determine whether the rotating driving mechanism of the mechanical equipment is overloaded when the steel wire rope is wound by the rotating driving mechanism of the mechanical equipment, and can control the rotating driving mechanism to stop when the rotating driving mechanism is overloaded, so that the driving force output by the telescopic driving mechanism can make the steel wire rope gradually wound, the length of the steel wire rope between the lifting tool and the telescopic driving mechanism is shortened, the lifting tool can continue to complete the work required when the rotating driving mechanism winds the steel wire rope, the telescopic driving mechanism can output greater output force than the rotating driving mechanism under the driving of the same power source, so that greater driving force can be provided by the telescopic driving mechanism to meet the overload requirement when the lifting tool works, and the overload work of the mechanical equipment is realized, and the requirement of normal engineering work is met.

Description

Technical Field

[0001] This invention relates to the field of mechanical equipment technology, and more specifically, to an overload working system and mechanical equipment. Background Technology

[0002] With the development of machinery and equipment, construction efficiency has been greatly improved, and machinery and equipment used for lifting and transporting materials have been widely used. The grabbing and lifting of materials by machinery and equipment is mainly achieved by the winding and unwinding of steel wire ropes.

[0003] During the lifting and transportation process, mechanical equipment may be overloaded due to different operating scenarios or objects. Whether the wire rope can be wound and unwound to meet the needs of overloaded working conditions becomes an important factor in whether the mechanical equipment can operate normally.

[0004] However, current rotary rope-winding drive structures, such as drive winches, can only achieve a low overload ratio when winding and unwinding wire ropes. In some engineering operations, they cannot achieve overload operations for the grabbing and lifting of mechanical equipment, which is not conducive to the normal progress of engineering operations. Summary of the Invention

[0005] The problem solved by this invention is how to enable mechanical equipment to operate under overload conditions in order to meet the needs of normal engineering operations.

[0006] To address the aforementioned problems, this invention provides an overload working system applied to mechanical equipment, comprising a telescopic drive mechanism and a control unit electrically connected to the telescopic drive mechanism. The telescopic drive mechanism is used to wind a steel wire rope around the mechanical equipment along the telescopic direction. The telescopic drive mechanism is used to extend along the telescopic direction to wind the steel wire rope. The control unit is electrically connected to the mechanical equipment and is used for:

[0007] When the rotary drive mechanism of the mechanical equipment drives the wire rope to be wound, determine whether the rotary drive mechanism is overloaded.

[0008] If not, continue to drive the lifting device of the mechanical equipment through the rotary drive mechanism and the wire rope to complete the operation;

[0009] If so, control the rotary drive mechanism to stop operating, and control the telescopic drive mechanism to gradually drive the wire rope to wind in, so as to drive the lifting device to complete the operation.

[0010] Compared to existing technologies, the beneficial effects of the overload working system of the present invention include: a telescopic drive mechanism is provided that can wind the wire rope of the mechanical equipment along the telescopic direction. The telescopic drive mechanism can increase the total length of the wire rope wound around it by outputting driving force, thereby causing tension in the wire rope. The telescopic drive mechanism continues to output driving force, enabling the wire rope to be wound in. Control units are provided, electrically connected to both the telescopic drive mechanism and the mechanical equipment. When the rotating drive mechanism of the mechanical equipment drives the wire rope to be wound in, the control unit can determine whether the rotating drive mechanism is overloaded. If the rotating drive mechanism is overloaded, it controls the rotating drive mechanism to stop. At this time, the control unit controls the telescopic drive mechanism to output driving force, thereby winding in the wire rope. This results in a shortening of the wire rope length between the lifting device and the telescopic drive mechanism. The shortening of the wire rope allows the lifting device to continue completing the work required when the rotating drive mechanism winds in the wire rope. Under the same power source, the telescopic drive mechanism can output a larger output force than the rotating drive mechanism, thus providing a greater driving force to meet the overload requirements of the lifting device during operation, thereby enabling the mechanical equipment to operate under overload conditions and meeting the needs of normal engineering operations.

[0011] Optionally, the telescopic drive mechanism includes a telescopic drive member and a first pulley. The drive end of the telescopic drive member is connected to the first pulley. The fixed end of the telescopic drive member and the first pulley are used to wind the wire rope along the telescopic direction. The telescopic drive member is electrically connected to the control unit. The control unit is used to control the extension of the drive end and drive the wire rope to wind in through the drive end and the first pulley.

[0012] Optionally, the telescopic drive mechanism further includes a second pulley, the fixed end is connected to the second pulley, the wire rope extends from the rotary drive mechanism, is wound around the second pulley and the first pulley in sequence, and is connected to the lifting device.

[0013] Optionally, the overload working system further includes a hydraulic pump, the telescopic drive component is a telescopic cylinder, the rotary drive mechanism includes a drive winch and a hydraulic drive motor, the hydraulic drive motor is driven by the wire rope through the drive winch, the hydraulic pump is used to connect to the telescopic cylinder and the hydraulic drive motor respectively through a reversing valve and a pipeline, the hydraulic drive motor, the hydraulic pump and the reversing valve are all electrically connected to the control unit, the control unit is used to: when the rotary drive mechanism is not overloaded, control the reversing valve to connect to the hydraulic drive motor through the pipeline; when the rotary drive mechanism is overloaded, control the reversing valve to connect to the telescopic cylinder through the pipeline.

[0014] Optionally, the overload working system further includes a flow control valve, which is connected to the output end of the hydraulic pump and electrically connected to the control unit. The control unit is used to adjust the output of the hydraulic pump through the flow control valve to control the output force of the telescopic drive mechanism to be within a preset range. Any value within the preset range is less than or equal to the maximum working tension of the wire rope and less than or equal to the force value when the lifting device is at its maximum strength.

[0015] Optionally, the overload working system further includes a brake, which is connected to the rotary drive mechanism and electrically connected to the control unit. When the control unit controls the rotary drive mechanism to stop operating, the control unit controls the brake to lock the rotary drive mechanism.

[0016] Optionally, the telescopic drive mechanism is used to be installed on the frame of the mechanical equipment; or, the telescopic drive mechanism is used to be installed on the arm of the mechanical equipment; or, the telescopic drive mechanism is used to be installed in the machine room of the mechanical equipment.

[0017] Optionally, the overload working system further includes a pressure sensor, which is mounted on the rotary drive mechanism and used to obtain the pressure in the direction of the wire rope winding of the rotary drive mechanism. The pressure sensor is electrically connected to the control unit, and the control unit determines whether the rotary drive mechanism is overloaded through the pressure sensor.

[0018] Optionally, there are multiple steel wire ropes and multiple telescopic drive mechanisms, with each telescopic drive mechanism corresponding to one of the multiple steel wire ropes to be wound in.

[0019] On the other hand, the present invention also provides a mechanical device, including a rotary drive mechanism, a wire rope, a lifting device, and an overload working system as described above.

[0020] Compared to the prior art, the beneficial effects of the mechanical device of the present invention are the same as those of the overload working system described above, and will not be repeated here. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the installation position of the telescopic drive mechanism in a mechanical device according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram showing the installation position of the telescopic drive mechanism in a mechanical device according to another embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram showing the installation position of the telescopic drive mechanism in a mechanical device in another embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the installation of the telescopic drive mechanism from one perspective in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the installation of the telescopic drive mechanism from another perspective in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the electrical connections of the control unit of the overload working system in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the layout of the overload working system in the mechanical equipment in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Mechanical equipment; 11-Rotary drive mechanism; 111-Drive winch; 112-Hydraulic drive motor; 12-Wire rope; 121-First wire rope; 122-Second wire rope; 13-Lifting device; 14-Hydraulic pump; 15-Directional control valve; 16-Arm; 17-Frame; 18-Machine room; 19-Pressure sensor; 2-Brake; 3-Telescopic drive mechanism; 31-Telescopic drive component; 32-First pulley; 33-Second pulley; 34-First telescopic drive mechanism; 35-Second telescopic drive mechanism; 4-Control unit; 5-Flow control valve. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0032] On one hand, one embodiment of the present invention provides an overload working system applied to mechanical equipment 1, including a telescopic drive mechanism 3 and a control unit 4 electrically connected to the telescopic drive mechanism 3. The telescopic drive mechanism 3 is used to wind a steel wire rope 12 of the mechanical equipment 1 along the telescopic direction. The telescopic drive mechanism 3 is used to extend along the telescopic direction to wind in the steel wire rope 12. The control unit 4 is used to be electrically connected to the mechanical equipment 1. The control unit 4 is used to: determine whether the rotary drive mechanism 11 is overloaded when the rotary drive mechanism 11 of the mechanical equipment 1 drives the steel wire rope 12 to wind in; if not, continue to drive the lifting device 13 of the mechanical equipment 1 through the rotary drive mechanism 11 and the steel wire rope 12 to complete the operation; if so, control the rotary drive mechanism 11 to stop operating, and control the telescopic drive mechanism 3 to gradually drive the steel wire rope 12 to wind in, so as to drive the lifting device 13 to complete the operation.

[0033] In this embodiment, as Figure 1 and Figure 6 As shown, an overload working system applicable to mechanical equipment 1 is set up. It includes a telescopic drive mechanism 3 that can wind a steel wire rope 12 around the mechanical equipment 1 in the telescopic direction. The telescopic drive mechanism 3 can increase the total length of the steel wire rope 12 wound around it by outputting driving force, thus tensioning the steel wire rope 12. The telescopic drive mechanism 3 continues to output driving force, enabling the steel wire rope 12 to be wound up. A control unit 4 is electrically connected to both the telescopic drive mechanism 3 and the mechanical equipment 1. When the rotating drive mechanism 11 of the mechanical equipment 1 drives the steel wire rope 12 to be wound up, the control unit 4 can determine whether the rotating drive mechanism 11 is overloaded. If the rotating drive mechanism 11 is overloaded, it controls the rotating drive mechanism 11 to stop. At this time, the control unit 4 controls the telescopic drive mechanism 3 to output driving force, thus winding up the steel wire rope 12. The required total length of the steel wire rope 12 wound around the telescopic drive mechanism 3 increases, while the rotating drive mechanism 11 is in a stopped state. The required length of the steel wire rope 12 to be wound up is increased. The increased length cannot be obtained from the rewinding of the wire rope 12 at the rotary drive mechanism 11. Therefore, the length compensation can only be obtained from the wire rope 12 between the telescopic drive mechanism 3 and the lifting device 13 of the mechanical equipment 1. This results in a shortening of the length of the wire rope 12 between the lifting device 13 and the telescopic drive mechanism 3. Since the wire rope 12 is connected to the lifting device 13, the shortening of the wire rope 12 allows the lifting device 13 to continue to complete the work required when the rotary drive mechanism 11 rewinds the wire rope 12. Under the same power source, the telescopic drive mechanism 3 can output a larger output force than the rotary drive mechanism 11. That is, the linear driving force output by the telescopic drive mechanism 3 is transmitted to the lifting device 13 by a tension force that is significantly greater than the rotational driving force output by the rotary drive mechanism 11 is transmitted to the lifting device 13 by a tension force. Thus, the telescopic drive mechanism 3 can provide a larger driving force to meet the overload requirements of the lifting device 13 during operation, thereby enabling the mechanical equipment to work under overload conditions and meeting the needs of normal engineering operations.

[0034] It should be noted that in this embodiment, the rotary drive mechanism 11 can output rotary drive force through a rotary motor or servo motor, and the telescopic drive mechanism 3 can output telescopic drive force through a hydraulic cylinder or pneumatic cylinder.

[0035] It should be noted that, in this embodiment, the mechanical equipment 1 used in the overload working system is a grab bucket dredger, but it can also be applied to other mechanical equipment 1 such as bridge cranes or tower cranes. Accordingly, the lifting device 13 in this embodiment is a grab bucket, and the rotary drive mechanism 11 uses a winch structure to wind in and wind out the wire rope 12.

[0036] It should be noted that, in this embodiment, depending on the type of lifting device 13, the operation of the lifting device 13 of the mechanical equipment 1 under the drive of the wire rope 12 may include lifting, grabbing or rotating.

[0037] It should be noted that in this embodiment, the grab bucket dredger used in the overload working system employs a hydrostatic transmission system for transmission operations. The driving force output by the telescopic drive mechanism 3 addresses the limitation of the original hydrostatic transmission system in achieving larger overload ratios, such as 4 times or more of the rated load, due to the relatively low pressure tolerance of its components. Of course, this embodiment can use either an open or closed hydrostatic transmission system for transmission operations, featuring active oil replenishment and circulating cooling. Furthermore, the open hydrostatic transmission system can limit the speed at which the wire rope 12 is wound out by the rotary drive mechanism 11 via a balance valve, which facilitates controllable sludge entry speed of the grab bucket.

[0038] It should be noted that in this embodiment, the power source of the telescopic drive mechanism 3 is a hydraulic power source, which can share a power source with the rotary drive mechanism 11, or the two power sources can be connected and used as backups for each other. In other embodiments of the present invention, the telescopic drive mechanism 3 can also use other power sources such as compressed air.

[0039] It should be noted that, in this embodiment, as Figure 4 As shown, the telescopic drive mechanism 3 is installed on the mechanical equipment 1 and is located on the side where the wire rope 12 is wound out by the rotary drive mechanism 11. In order to ensure the stable output of the wire rope 12 of the rotary drive mechanism 11, a guide wheel is generally provided on the side where the wire rope 12 is wound out by the rotary drive mechanism 11. Similarly, a guide wheel can also be provided between the telescopic drive mechanism 3 and the lifting device 13 to guide the wire rope between the telescopic drive mechanism 3 and the lifting device 13.

[0040] Optionally, the telescopic drive mechanism 3 includes a telescopic drive member 31 and a first pulley 32. The drive end of the telescopic drive member 31 is connected to the first pulley 32. The fixed end of the telescopic drive member 31 and the first pulley 32 are used to wind the wire rope 12 along the telescopic direction. The telescopic drive member 31 is electrically connected to the control unit 4. The control unit 4 is used to control the extension of the drive end and drive the wire rope 12 to be wound in through the drive end and the first pulley 32.

[0041] In this embodiment, as Figure 4 and Figure 5 As shown, a telescopic drive component 31 is set as the main power output body of the telescopic drive mechanism 3. A first pulley 32 is connected to the drive end of the telescopic drive component 31. The groove of the first pulley 32 can abut against the wire rope 12. The telescopic drive component 31 is electrically connected to the control unit 4. When the control unit 4 controls the telescopic drive component 31 to output power, the drive end extends, thereby driving the wheel of the first pulley 32 to move and driving the wire rope 12 to wind in. At the same time, the wheel of the first pulley 32 rotates, and the wire rope 12 moves under the guidance of the groove of the first pulley 32, effectively reducing the friction of the wire rope 12 when it moves, thereby reducing the power output required for the drive end of the telescopic drive component 31 to extend. This allows the telescopic drive component 31 to bear a larger load through the wire rope 12, improving the stability of the mechanical equipment 1 when it is overloaded.

[0042] Optionally, the telescopic drive mechanism 3 further includes a second pulley 33, the fixed end of the telescopic drive member 31 is connected to the second pulley 33, the wire rope 12 extends from the rotary drive mechanism 11, is wound around the second pulley 33 and the first pulley 32 in sequence, and is connected to the lifting device 13.

[0043] In this embodiment, as Figure 4 and Figure 5 As shown, the fixed end of the telescopic drive component 31 is connected to a second pulley 33. The wire rope 12 between the rotary drive mechanism 11 and the lifting device 13 is sequentially wound around the second pulley 33 and the first pulley 32. When the drive end of the telescopic drive component 31 extends, the first pulley 32 moves away from the second pulley 33, increasing the distance between the first pulley 32 and the second pulley 33. This increases the length of the wire rope 12 that can be accommodated between the first pulley 32 and the second pulley 33. Consequently, the wire rope 12 between the telescopic drive mechanism 3 and the lifting device 13 is shortened through the rope capacity of the first pulley 32 and the second pulley 33, improving the stability of the mechanical equipment 1 when performing overloaded operations.

[0044] It should be noted that, in this embodiment, as Figure 5As shown, the first pulley 32 at the drive end of the telescopic drive member 31 has multiple pulleys 32 arranged concentrically in parallel, and the second pulley 33 at the fixed end of the telescopic drive member 31 has multiple pulleys 33 arranged concentrically in parallel. By increasing the number of pulleys, the length of the wire rope 12 wound around the first pulley 32 and the second pulley 33 is further increased, which facilitates the accommodation of the wire rope 12 by extending the drive end of the telescopic drive member 31, thereby improving the stability of the mechanical equipment 1 when it is overloaded.

[0045] Optionally, the overload working system also includes a hydraulic pump 14, a telescopic drive component 31 which is a telescopic cylinder, and a rotary drive mechanism 11 which includes a drive winch 111 and a hydraulic drive motor 112. The hydraulic drive motor 112 is driven by the wire rope 12 through the drive winch 111. The hydraulic pump 14 is used to connect to the telescopic cylinder and the hydraulic drive motor 112 through a reversing valve 15 and pipelines respectively. The hydraulic drive motor 112, the hydraulic pump 14, and the reversing valve 15 are all electrically connected to the control unit 4. The control unit 4 is used to: control the reversing valve 15 to connect to the hydraulic drive motor 112 through pipelines when the rotary drive mechanism 11 is not overloaded; and control the reversing valve 15 to connect to the telescopic cylinder through pipelines when the rotary drive mechanism 11 is overloaded.

[0046] In this embodiment, as Figure 4 , Figure 5 and Figure 6 As shown, the telescopic drive component 31 is configured as a telescopic cylinder, and its power source structure is configured as a hydraulic pump 14. The rotary drive mechanism 11 includes a hydraulic drive motor 112 and a drive winch 111 connected to the hydraulic drive motor 112. The hydraulic drive motor 112 can drive the wire rope 12 to be wound in and out through the drive winch 111. The hydraulic pump 14 is connected to the telescopic cylinder and the hydraulic drive motor 112 through a reversing valve 15 and pipelines, respectively. The hydraulic drive motor 112, the hydraulic pump 14, and the reversing valve 15 are all electrically connected to the control unit 4. Thus, under the control of the control unit 4, when the rotary drive mechanism 11 is not overloaded, the reversing valve 15 can realize the input of the hydraulic pump 14 to the power source of the hydraulic drive motor 112 to realize the winding and unwinding of the wire rope 12. Correspondingly, when the rotary drive mechanism 11 is overloaded, the reversing valve 15 can realize the input of the hydraulic pump 14 to the power source of the telescopic cylinder to realize the winding of the wire rope 12, thereby realizing the overload operation of the mechanical equipment 1.

[0047] It should be noted that in this embodiment, the reversing valve 15 is a solenoid reversing valve. In other embodiments of the present invention, it may also be an electro-hydraulic reversing valve.

[0048] Optionally, the overload working system also includes a flow control valve 5, which is connected to the output end of the hydraulic pump 14 and electrically connected to the control unit 4. The control unit 4 is used to adjust the output of the hydraulic pump 14 through the flow control valve 5 to control the output force of the telescopic drive mechanism 3 to be within a preset range. Any value within the preset range is less than or equal to the maximum working tension value of the wire rope 12 and less than or equal to the force value of the lifting device 13 when it is at its maximum strength.

[0049] In this embodiment, as Figure 6 As shown, a flow control valve 5 is also installed at the output end of the hydraulic pump 14. The flow control valve 5 can control the output oil pressure of the hydraulic pump 14. The control unit 4 is electrically connected to the flow control valve 5. In this way, the control unit 4 can control the flow control valve 5 to control the output oil pressure of the hydraulic pump 14, so that the output force of the telescopic drive mechanism 3 connected to the hydraulic pump 14 can be within a preset range. Any value within this preset range is less than or equal to the maximum working tension of the wire rope 12 and less than or equal to the force value of the lifting device 13 when it is at its maximum strength. That is, under the action of this output force, the tension value of the wire rope 12 will not exceed the maximum working tension value, and the load borne by the lifting device 13 will not exceed the maximum structural strength value. Thus, while realizing the overload operation of the mechanical equipment 1, the structural stability of the mechanical equipment 1 is guaranteed.

[0050] It should be noted that in this embodiment, mechanical equipment 1 is a grab bucket dredger, and correspondingly, lifting device 13 is a grab bucket. Any value within the preset range is also less than or equal to the force value when the grab bucket teeth are at their maximum strength.

[0051] It should be noted that in this embodiment, the flow control valve 5 is an overflow valve, and further, it can be an electromagnetic proportional overflow valve.

[0052] Optionally, the overload working system also includes a brake 2, which is connected to the rotary drive mechanism 11 and electrically connected to the control unit 4. When the control unit 4 controls the rotary drive mechanism 11 to stop operating, the control unit 4 controls the brake 2 to lock the rotary drive mechanism 11.

[0053] In this embodiment, as Figure 4 and Figure 5 As shown, in order to ensure the stability of the rotary drive mechanism 11 when it stops, a brake 2 is also provided on the rotary drive mechanism 11. The brake 2 is electrically connected to the control unit 4. In this way, the control unit 4 can lock the rotary drive mechanism 11 through the brake 2. Even if the power sources of the telescopic drive mechanism 3 and the rotary drive mechanism 11 are different, the stability of the rotary drive mechanism 11 when it stops can be guaranteed, thereby achieving the purpose of shielding the rotary drive mechanism 11.

[0054] It should be noted that, in this embodiment, the brake 2 consists of a static brake of the hydrostatic transmission system inside the rotary drive mechanism 11 and an overload static brake disposed outside the rotary drive mechanism 11 and connected to the rotary structure of the rotary drive mechanism 11. By closing the brake oil supply valves of the static brake and the overload static brake, the rotary drive mechanism 11 can be braked and locked. Furthermore, the brake oil supply valve is a brake oil supply solenoid valve.

[0055] Optionally, the telescopic drive mechanism 3 is used to be installed on the frame 17 of the mechanical equipment 1; or, the telescopic drive mechanism 3 is used to be installed on the arm 16 of the mechanical equipment 1; or, the telescopic drive mechanism 3 is used to be installed in the machine room 18 of the mechanical equipment 1.

[0056] In this embodiment, as Figure 1 As shown, the telescopic drive mechanism 3 can be installed in the machine room 18 of the mechanical equipment 1. In other embodiments of the present invention, the telescopic drive mechanism 3 can also be installed in other positions of the mechanical equipment 1, such as the frame 17 or the arm 16.

[0057] It should be noted that in this embodiment, mechanical equipment 1 is a grab bucket dredger, and frame 17 is the A-frame of the grab bucket dredger.

[0058] Optionally, the overload working system also includes a pressure sensor 19, which is mounted on the rotary drive mechanism 11 and used to obtain the pressure of the wire rope 12 in the winding direction of the rotary drive mechanism 11. The pressure sensor 19 is electrically connected to the control unit 4, and the control unit 4 determines whether the rotary drive mechanism 11 is overloaded through the pressure sensor 19.

[0059] In this embodiment, as Figure 6 As shown, a pressure sensor 19 is installed on the rotary drive mechanism 11. Specifically, the pressure sensor 19 is installed at the point where the wire rope 12 is wound into the rotary drive mechanism 11 and is electrically connected to the control unit 4. In this way, the control unit 4 can obtain the pressure in the winding direction of the wire rope 12 through the pressure sensor 19, and then determine whether the load of the wire rope 12 is overloaded, and then determine whether the rotary drive mechanism 11 is overloaded.

[0060] Optionally, there are multiple wire ropes 12 and multiple telescopic drive mechanisms 3, with each telescopic drive mechanism 3 driving multiple wire ropes 12 to be wound in one-to-one.

[0061] For different operational needs, the lifting device 13 of the mechanical equipment 1 may have different lifting devices. For example, the lifting device 13 of a grab bucket dredger is a grab bucket, which needs to grab and lift. The lifting device 13 of a bridge crane needs to lift and rotate. Therefore, in this embodiment, such as Figure 7As shown, the number of wire ropes 12 is set to multiple as needed, and the number of telescopic drive mechanisms 3 is also set to multiple accordingly. Multiple telescopic drive mechanisms 3 are used to drive multiple wire ropes 12 to be wound in one by one. The driving force is output by different telescopic drive mechanisms 3 to meet the needs of different operations of the lifting device 13.

[0062] For example, in this embodiment, the lifting device 13 is a grab bucket, the wire rope 12 includes a first wire rope 121 and a second wire rope 122, and the telescopic drive mechanism 3 includes a first telescopic drive mechanism 34 and a second telescopic drive mechanism 35. The first telescopic drive mechanism 34 can drive the first wire rope 121 to wind in, thereby achieving overload lifting of the grab bucket, and the second telescopic drive mechanism 35 can drive the second wire rope 122 to wind in, thereby achieving overload grabbing of the grab bucket.

[0063] On the other hand, one embodiment of the present invention provides a mechanical device including a rotary drive mechanism 11, a wire rope 12, a lifting device 13, and the above-mentioned overload working system.

[0064] like Figures 1 to 7 As shown, the technical effect of the mechanical equipment in this embodiment is similar to that of the overload working system described above, and will not be repeated here.

[0065] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An overload working system applied to a mechanical device (1), characterized in that, The device includes a telescopic drive mechanism (3) and a control unit (4) electrically connected to the telescopic drive mechanism (3). The telescopic drive mechanism (3) is used to wind a wire rope (12) of the mechanical device (1) along the telescopic direction. The telescopic drive mechanism (3) is used to extend along the telescopic direction to wind the wire rope (12). The control unit (4) is used to be electrically connected to the mechanical device (1). The control unit (4) is used to: When the rotary drive mechanism (11) of the mechanical equipment (1) drives the wire rope (12) to be wound, it is determined whether the rotary drive mechanism (11) is overloaded; If not, continue to drive the lifting device (13) of the mechanical equipment (1) through the rotary drive mechanism (11) and the wire rope (12) to complete the operation; If so, control the rotary drive mechanism (11) to stop operating, and control the telescopic drive mechanism (3) to gradually drive the wire rope (12) to wind in, so as to drive the lifting device (13) to complete the operation; The telescopic drive mechanism (3) includes a telescopic drive member (31) and a first pulley (32). The drive end of the telescopic drive member (31) is connected to the first pulley (32). The fixed end of the telescopic drive member (31) and the first pulley (32) are used to wind the wire rope (12) along the telescopic direction. The telescopic drive member (31) is electrically connected to the control unit (4). The control unit (4) is used to control the extension of the drive end and drive the wire rope (12) to be wound in through the drive end and the first pulley (32). The telescopic drive mechanism (3) also includes a second pulley (33), the fixed end is connected to the second pulley (33), the wire rope (12) extends from the rotary drive mechanism (11), and is sequentially wound around the second pulley (33) and the first pulley (32), and is connected to the lifting device (13); when the drive end of the telescopic drive member (31) extends, the first pulley (32) moves away from the second pulley (33), so that the length of the wire rope (12) that can be accommodated between the first pulley (32) and the second pulley (33) increases. The wire rope (12) between the telescopic drive mechanism (3) and the lifting device (13) is shortened through the rope capacity of the first pulley (32) and the second pulley (33), thereby improving the stability of the mechanical equipment (1) when it is overloaded. It also includes a hydraulic pump (14), the telescopic drive component (31) is a telescopic cylinder, the rotary drive mechanism (11) includes a drive winch (111) and a hydraulic drive motor (112), the hydraulic drive motor (112) is driven and connected to the wire rope (12) through the drive winch (111), the hydraulic pump (14) is used to connect to the telescopic cylinder and the hydraulic drive motor (112) through a reversing valve (15) and a pipeline respectively, the hydraulic drive motor (112), the hydraulic pump (14) and the reversing valve (15) are all electrically connected to the control unit (4), the control unit (4) is used to: when the rotary drive mechanism (11) is not overloaded, control the reversing valve (15) to connect to the hydraulic drive motor (112) through the pipeline; when the rotary drive mechanism (11) is overloaded, control the reversing valve (15) to connect to the telescopic cylinder through the pipeline.

2. The overload work system of claim 1, wherein, It also includes a flow control valve (5), which is connected to the output end of the hydraulic pump (14) and electrically connected to the control unit (4). The control unit (4) is used to adjust the output of the hydraulic pump (14) through the flow control valve (5) to control the output force of the telescopic drive mechanism (3) to be within a preset range. Any value within the preset range is less than or equal to the maximum working tension of the wire rope (12) and less than or equal to the force value of the lifting device (13) when it is at its maximum strength.

3. The overload work system of any one of claims 1-2, wherein, It also includes a brake (2), which is used to connect to the rotary drive mechanism (11) and electrically connect to the control unit (4). When the control unit (4) controls the rotary drive mechanism (11) to stop operating, the control unit (4) controls the brake (2) to lock the rotary drive mechanism (11).

4. The overload work system of any one of claims 1 to 2, wherein, The telescopic drive mechanism (3) is used to be installed on the frame (17) of the mechanical equipment (1); or, the telescopic drive mechanism (3) is used to be installed on the arm (16) of the mechanical equipment (1); or, the telescopic drive mechanism (3) is used to be installed in the machine room (18) of the mechanical equipment (1).

5. The overload working system according to any one of claims 1 to 2, characterized in that, It also includes a pressure sensor (19), which is mounted on the rotary drive mechanism (11) and used to obtain the pressure of the wire rope (12) winding direction of the rotary drive mechanism (11). The pressure sensor (19) is electrically connected to the control unit (4), and the control unit (4) determines whether the rotary drive mechanism (11) is overloaded through the pressure sensor (19).

6. The overland working system of any one of claims 1 to 2, wherein, There are multiple steel wire ropes (12) and multiple telescopic drive mechanisms (3). The multiple telescopic drive mechanisms (3) are used to drive the multiple steel wire ropes (12) to be wound in one-to-one.

7. A mechanical device, characterized by It includes a rotary drive mechanism (11), a wire rope (12), a lifting device (13), and an overload working system as described in any one of claims 1 to 6.

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