Lifting device with self-locking function for target object lifting construction

Abstract

The lifting device with the self-locking function comprises a driver, a controller, a transmission structure, a stranding disc, a lifting cable and a supporting device, the controller is electrically connected with the driver, the driver is connected with the transmission structure and used for driving the transmission structure to rotate, the transmission structure is connected with the stranding disc, and the lifting cable is connected with the supporting device. The stranding disc is installed on the supporting device, the other end of the lifting cable is wound on the stranding disc, and the other end of the lifting cable is used for being connected with a damping box body. The lifting device with the self-locking function can be used for target object lifting construction so as to lift a target object, can prevent the target object from falling, can still maintain the current height of the target object under the condition that a power source is powered off or breaks down, can avoid falling of the target object and can guarantee safety, and is simple in structure, convenient to operate and low in cost. The device is easy to maintain, high in practicability, low in cost and suitable for large-scale popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of construction vibration control devices, in particular to a lifting device with a self-locking function used for target object lifting construction. Background Art

[0002] In many engineering construction projects, especially building construction, overall lifting construction technology is often used to lift the target object and complete the installation, thereby realizing the construction and installation of complex steel structures such as large space roofs, super high-rise steel corridors and long-span bridges.

[0003] By lifting the target object to achieve construction, the target object can be pre-assembled on the ground or at a low altitude (within a small preset distance from the ground or the work platform), thereby avoiding the need to assemble the target object at a high altitude (such as a high floor), thereby reducing the risk of high-altitude operations and improving construction safety and assembly accuracy. The assembled target object can be the general framework of the assembled target object instead of all its components, or all its components can be pre-assembled. After the target object is assembled, the target object is lifted to the target height by a lifting device, thereby delivering the target object to the designated location for installation.

[0004] At present, when a target object is lifted by a hoist, it is generally adopted that the hoist is connected to the target object by a rope (such as a steel strand), and the target object is continuously raised in height by winding the rope. With such a lifting device and lifting method, since the entire structure (the structure composed of the hoist, the rope and the target object) is similar to a simple pendulum, the structure is easily affected by the effect of wind load, which causes the structure to vibrate, causing a safety hazard in construction. In particular, when there is a sudden change in wind speed or the wind force exceeds expectations (referring to excessive wind force), the structure may shake violently, thereby threatening construction safety. At present, for the use of such a structure, it is generally required to carry out lifting construction in an environment with a wind force of less than level 6. However, even in such a relatively small wind environment, if the lifting construction is carried out for a long time, it may still encounter sudden strong winds during the construction process, thereby increasing the uncertainty of construction and forming a safety hazard.

[0005] To eliminate or reduce structural vibration, existing technologies generally employ tuned mass dampers (TMDs). TMDs are vibration control devices commonly used to mitigate structural vibration. Their operating principle primarily involves the interaction of a mass, spring, and damping system to absorb and offset the structure's vibration energy, thereby eliminating or reducing vibration. During the lifting process, as the target object gradually rises, the length of the rope used to lift it changes. Furthermore, wind speeds generally increase with altitude, meaning that wind speeds at high altitudes are generally higher than those at ground level. Therefore, as the height of the target object increases, the probability of the structure encountering wind loads increases. This also increases the probability of encountering large wind loads, leading to a gradual increase in the structure's natural frequency. In other words, the higher the target object is lifted, the higher its natural frequency. This change in natural frequency reduces the effectiveness of traditional TMDs in eliminating or reducing structural vibration, and consequently, the effectiveness of the tuned mass damper in eliminating or reducing vibration. Therefore, relying solely on the frequency tuning of traditional TMDs often yields limited results.

[0006] In summary, we hope to have a related device and / or method that can realize vibration control for the lifting construction of the target object, so that the vibration can be adaptively adjusted and controlled according to the changes in the height position of the target object, so as to achieve the purpose of eliminating or weakening the vibration caused by external interference during the lifting process of the target object, thereby improving construction safety. Utility Model Content

[0007] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a lifting device with a self-locking function for target object lifting construction, which can solve the problem of achieving target object lifting pointed out in the background technology description.

[0008] The technical solution to achieve the purpose of the utility model is: a lifting device with a self-locking function for target object lifting construction, including a driver, a controller, a transmission structure, a winch drum, a lifting cable and a support device, the controller is electrically connected to the driver, the driver is connected to the transmission structure, and is used to drive the transmission structure to rotate, the transmission structure is connected to the winch drum, the winch drum is installed on the support device, the other end of the lifting cable is wound around the winch drum, and the other end is used to be connected to the damping box.

[0009] Furthermore, the transmission structure includes a first gear and a second gear. The output end of the driver is connected to the first gear. The first gear and the second gear are meshed and connected. The first gear is located on one side of the second gear, and the second gear is sleeved on the winch drum.

[0010] Furthermore, the supporting device includes two base plates arranged in parallel with each other, and both ends of the winch drum are rotatably mounted on the two base plates.

[0011] Furthermore, the lifting device also includes a bearing base, which is installed on the base plate, and the winch drum is movably connected to the bearing base after passing through the base plate.

[0012] Furthermore, the bearing base is located on the outside of the base plate, or is embedded in the base plate, and the second gear is located on the inside of the base plate.

[0013] Furthermore, the driver is a servo motor, the lifting cable is a steel strand, and the first gear and the second gear are circular arc gears.

[0014] Furthermore, the lifting device also includes a limit protection plate, which is sleeved on the winch drum, and the limit protection plate is attached to the second gear and is located on the outside of the second gear.

[0015] Furthermore, the lifting device also includes a self-locking component, which is installed on the supporting device and connected to the winch drum. The self-locking component is used to lock the winch drum from rotating in the reverse direction to limit the winch drum from rotating in the reverse direction and only allow the winch drum to rotate in the forward direction.

[0016] Furthermore, the self-locking assembly includes a self-locking gear, a self-locking pin, a pin bearing, a blocking column and a self-locking spring. The self-locking gear is fixedly mounted on the capstan drum and can rotate with the capstan drum. The self-locking gear is located on the inner side of the base plate and is spaced parallel to the base plate.

[0017] The latch bearing is fixedly mounted on the base plate, and one end of the self-locking latch is movably mounted on the latch bearing so that the self-locking latch can rotate relative to the self-locking latch, and the other end of the self-locking latch extends between two adjacent teeth of the self-locking gear, and the side of the other end abuts against one of the two adjacent teeth. The blocking column is fixed on the base plate and spaced apart from the latch bearing. The blocking column is between the self-locking gear and the latch bearing. One end of the self-locking spring is fixedly connected to the blocking column, and the other end is fixedly connected to the self-locking latch.

[0018] Furthermore, one of the side edges of the teeth of the self-locking gear is a bevel, and the self-locking pin is close to one end of the self-locking gear. The inclination angle of the bevel matches the side edge of the self-locking pin close to the end of the self-locking gear, so that the self-locking pin only allows the self-locking gear to rotate in the forward direction and prevents the self-locking gear from rotating in the reverse direction.

[0019] The beneficial effects of the present invention are as follows: The lifting device described in the present invention can be used as a lifting device with a self-locking function for target object lifting construction to achieve the lifting of the target object. In this embodiment, the target object is a damping box, but in actual use, the target object can be other components. This prompt device can not only achieve the lifting of the target object, but also prevent the target object from falling. In the event of a power outage or failure of the power source, the target object can still be maintained at its current height, preventing the target object from falling and ensuring safety. In addition, the lifting device has a simple structure, is easy to maintain, has strong practicality, is low-cost, and is suitable for large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the vibration control device;

[0021] Figure 2 It is a structural diagram of the damping box in the vibration control device;

[0022] Figure 3 Schematic diagram of the block distribution of the damping box;

[0023] Figure 4 It is a structural schematic diagram of the lifting device in the vibration control device;

[0024] Figure 5 It is a structural diagram of some components of the lifting device;

[0025] Figure 6 It is a structural schematic diagram of another part of the lifting device;

[0026] Figure 7 1 is a flow chart of a vibration control method;

[0027] In the figure, 1-hoist, 2-suspension cable, 3-target, 4-lifting device, 401-driver, 402-controller, 403-first gear, 404-winch drum, 405-second gear, 406-bearing base, 407-lifting cable, 408-self-locking assembly, 4081-self-locking gear, 4082-self-locking pin, 4083-pin bearing, 4084-stop column, 4085-self-locking spring, 409-base plate, 5-damping box, 501-inner box, 502-block, 503-injection port, 6-distance measuring device. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific implementation plans:

[0029] like Figures 1-6As shown, this embodiment provides a vibration control device for lifting construction of a target object 3, including a hoist 1, a distance measuring device 6, a suspension cable 2, a hoisting device 4 and a damping box 5. The hoist 1 is connected to the target object 3 through the suspension cable 2, and the hoist 1 is used to lift the target object 3. The distance measuring device 6 is installed on the hoist 1 or beside the hoist 1, and the distance measuring device 6 is used to measure the distance between the target object 3 and the hoist 1, and the distance is recorded as the first distance.

[0030] Exemplarily, the output end of the lifter 1 is connected to one end of the suspension cable 2, and the other end of the suspension cable 2 is connected to the target object 3. The output end of the lifter 1 controls the lifting and lowering of the target object 3 through the suspension cable 2 to achieve the effect of lifting the target object 3 or lowering the target object 3.

[0031] The lifting device 1 controls the lifting and lowering of the target object 3, which is an existing technology. Its main principle is to lift the target object 3 by repeatedly pulling up the suspension cable 2, which is similar to two hands lifting an object through a cable. The two hands repeatedly and alternately loosen and tighten the suspension cable 2 to lift or lower the target object 3. Therefore, the specific implementation process of the lifter lifting the target object 3 will not be repeated here.

[0032] The first distance is the distance between the lifter 1 and the end surface of the target object 3 closest to the lifter 1. The end surface of the target object 3 closest to the lifter 1 is the upper surface of the target object 3. Since the distance measuring device 6 is installed on or beside the lifter 1, the lifter 1 and the distance measuring device 6 are considered to be in the same position. Therefore, the distance between the lifter 1 and the target object 3 is also the distance between the distance measuring device 6 and the target object 3.

[0033] In the process of lifting the target object 3, the height position of the lifter 1 remains unchanged, that is, the height of the lifter 1 always remains unchanged. When the target object 3 is in the initial position, for example, the target object 3 is placed on the ground or at a height within a preset distance range from the ground as the initial position, the first distance is the largest, that is, the distance between the lifter 1 and the target object 3 is the largest. As the target object 3 is continuously lifted and its height continues to increase, the first distance gradually decreases, that is, the lifter 1 repeatedly pulls up the suspension cable 2, thereby continuously shortening the distance between the target object 3 and the lifter 1, so that the first distance is continuously reduced. Conversely, by lowering the suspension cable 2, the target object 3 can be continuously lowered, and the height of the target object 3 is continuously reduced.

[0034] For example, the distance measuring device 6 is a laser sensor, which can measure the distance between the target object 3 and the lifter 1 using the laser distance measurement principle.

[0035] For example, a plurality of lifters 1 are included, each lifter 1 having a corresponding distance measuring device 6 mounted on or beside it. Each lifter 1 is connected to a corresponding suspension cable 2 and target 3. The lifters 1 are spaced apart and located at the same height, that is, on the same horizontal plane at a certain height, so that the target 3 suspended by the suspension cable 2 is in a horizontal state, preventing the target 3 from tilting. Of course, if the target 3 is allowed to tilt in actual application, the lifters 1 can be located at different heights.

[0036] refer to Figure 1 , Figure 1 The diagram shows four lifters 1 , which correspond to four suspension cables 2 , each lifter 1 corresponding to one suspension cable 2 , the four lifters 1 being at the same height, and each lifter 1 being equipped with a distance measuring device 6 .

[0037] For example, when the target object 3 is a rectangular structure, the four suspension cables 2 corresponding to the four lifters 1 are connected to the four corners of the target object 3 respectively.

[0038] Exemplarily, the lifter 1 is a hydraulic lifter 1. Of course, in actual use, other types of lifters 1 may also be used, as long as they have a lifting function capable of lifting the target object 3.

[0039] The lifting device 4 is installed on the target object 3 and is connected to the damping box 5 . The lifting device 4 is used to lift and lower the damping box 5 to adjust the distance between the damping box 5 and the target object 3 .

[0040] Exemplarily, the lifting device 4 realizes the distance between the damping box 5 and the target object 3 by adjusting the movement of the damping box 5 between the first position and the second position.

[0041] First position: the damping box 5 is located outside the side of the target object 3 away from the lifter 1 .

[0042] Second position: the damping box 5 is in contact with the end surface of the target object 3 away from the lifter 1 or extends into the cavity of the target object 3 .

[0043] refer to Figure 1 , Figure 1 The damping box 5 is located outside the side of the target object 3 away from the lifter 1.

[0044] Exemplarily, there are multiple lifting devices 4, each of which is installed at intervals on the target object 3. Each lifting device 4 is connected to a different position of the damping box 5. Each lifting device 4 jointly lifts and lowers the damping box 5, thereby adjusting the distance between the damping box 5 and the target object 3. Figure 1Schematically shown are four lifting devices 4, which are arranged in a rectangular shape. The four lifting devices 4 are respectively connected to the four corners of the damping box 5, and the damping box 5 is also a rectangular structure.

[0045] For example, the target object 3 is provided with an open cavity having an opening. The opening and the open cavity are larger than the damping box 5, so that the damping box 5 can pass through the opening and enter the open cavity. When the target object 3 is a grid or truss, some components of the grid or truss (such as several connecting beams) can be left unconnected, thereby forming a larger open cavity within the grid or truss. The volume of the open cavity is sufficient to accommodate the damping box 5 and the unconnected components.

[0046] Exemplarily, the damping box 5 includes an inner box 501 and an outer box (not shown). Each of the inner box 501 and the outer box includes a cavity with an opening. The inner box 501 is located within the cavity of the outer box. An annular cavity is formed between the inner box 501 and the outer box. A plurality of blocks 502 are distributed within the annular cavity, and the blocks 502 are distributed along the extension direction of the annular cavity. The lifting device 4 and the damping box 5 constitute a TMD. The damping box 5 includes the inner box 501, the outer box, and the liquid and blocks 502 in the annular cavity.

[0047] Exemplarily, the inner box 501 and the outer box are both rectangular and include an open cavity. The inner box 501 is embedded and installed in the cavity of the outer box through the opening of the outer box. The damping box 5 formed by assembling the inner box 501 and the outer box includes an open cavity, which can be used to place objects, for example, for placing patch parts. The patch parts can be the original parts of the target object 3 in the space reserved to accommodate the damping box 5, or other components of the target object 3, or other related parts required for construction. When the inner box 501 is located in the cavity of the outer box, the upper ends of the inner box 501 and the outer box are flush, and the lower end of the inner box 501 is in contact with the inner bottom wall surface of the outer box, or the lower end of the inner box 501 is spaced apart from the inner bottom wall surface of the outer box. The four circumferential sides of the inner box 501 are spaced apart from the outer box, and / or the bottom of the inner box 501 is spaced apart from the outer box, thereby forming an interval space, which forms the annular cavity. That is to say, the inner box 501 can be spaced apart from the outer box only at the bottom, or it can be spaced apart from the outer box only at the four sides of the inner box 501, or it can be spaced apart from the outer box at the bottom and four sides of the inner box 501. The block 502 can be directly fixed or removably mounted on the outer wall surface of the inner box 501, or installed on the inner wall surface of the outer box. In all blocks 502, there is a gap between at least a portion of the blocks 502, so that the liquid (such as pure water) injected into the annular cavity can flow through the gap, and then reach all positions or specified partial positions of the annular cavity.

[0048] Exemplarily, the damping box 5 is also equipped with several injection ports 503 and several discharge ports (not shown in the figure). The injection ports 503 and the discharge ports are both connected to the annular cavity. Liquid can be injected into the annular cavity through the injection ports 503, and the liquid in the annular cavity can be discharged through the discharge ports.

[0049] For example, the blocks 502 are distributed regularly or irregularly within the annular cavity. For example, the blocks 502 are distributed in an array within the annular cavity. Another example is that the blocks 502 are distributed at non-uniform intervals within the annular cavity. The density of the blocks 502 within each region of the annular cavity can be the same or different, so as to form a distribution of blocks 502 with different sparseness or a distribution of blocks 502 with the same sparseness. The most effective effect is when the blocks 502 are evenly distributed in a staggered manner, such as in a matrix array.

[0050] Exemplarily, the structural shape of the block 502 is a regular geometric structure or an irregular geometric structure. For example, the block 502 is a rectangular structure or an irregular curve structure.

[0051] The sparseness and shape of the blocks 502 affect the damping value of the damping box 5. The denser the distribution of the blocks 502, that is, the greater the density of the blocks 502, the greater the damping of the damping box 5. Furthermore, the liquid injected into the annular cavity also affects the damping value of the damping box 5. The greater the viscosity of the liquid in the annular cavity, the greater the damping of the damping box 5.

[0052] For example, the size of the block 502 needs to be appropriate. Here, the size of the block 502 refers to the size of a single block 502. According to actual tests, the size of the block 502 is related to the size of the damping box 5. The maximum size of the block 502 is no greater than 1 / 4 of the smallest of the length and width of the damping box 5. The minimum size of the block 502 is no less than 1 / 20 of the largest of the length and width of the damping box 5.

[0053] For example, the amount of liquid injected into the annular cavity is less than or equal to 1 / 2 the height of the damping box 5. That is, the liquid level in the annular cavity is ≤ 1 / 2 the height of the damping box 5. The mass of the liquid should also be preferably less than or equal to 1 / 3 the combined mass of the inner and outer boxes. By controlling the height and mass of the liquid, oscillations within the annular cavity can be prevented, thereby affecting the natural frequency of the TMD.

[0054] For example, the spacing length between the blocks 502, the total number of blocks 502, the shape of the blocks 502, and the amount of liquid injected can be determined through experiments or CFD (Computational Fluid Dynamics) simulation. The CFD simulation provided in this example includes the following steps:

[0055] S1. Establish a geometric model of a double-layer box composed of an inner box 501 and an outer box to form a damping box 5. The annular cavity of the damping box 5 is used as a calculation domain, and the annular cavity is meshed.

[0056] S2. The VOF multiphase flow model is used to obtain the shape of the free liquid surface, and the Realizable k-ε turbulence model is used to calculate the effect of liquid viscosity.

[0057] S3. Mark the initial liquid level position.

[0058] S4. Apply a horizontal acceleration disturbance of 0.2g and record the free oscillation time history curve of the liquid surface at its side wall.

[0059] S5. Calculate its average damping ratio based on the improved Hilbert-Huang transform (HHT) method.

[0060] S6. Return to step S3 to calculate the average damping corresponding to different liquid level heights and fit the formula for subsequent engineering applications.

[0061] S7. Return to step S1, calculate the simulation analysis results for different block 502 arrangement densities and shapes, and establish a database to facilitate subsequent engineering to determine the spacing length between blocks 502, the total number of blocks 502 to be set, the shape of blocks 502 and the amount of liquid injected.

[0062] The lifting device 4 includes a driver 401, a controller 402, a first gear 403, a second gear 405, a winch drum 404, a lifting cable 407, a bearing base 406, a self-locking assembly 408, and a base plate 409. Driver 401 is electrically connected to controller 402 and mounted on controller 402. The output end of driver 401 is connected to first gear 403, and driver 401 drives first gear 403 to rotate via the output end. First gear 403 and second gear 405 are meshed and connected, with first gear 403 located on one side of second gear 405. Second gear 405 is sleeved on winch drum 404, which is a cylindrical structure. The ends of winch drum 404 are rotatably mounted on two base plates 409, which are spaced apart and arranged in parallel. One end of the lifting cable 407 is wound around the winch drum 404 , and the other end is used to connect to the damping box 5 , so that the damping box 5 can be lifted by the lifting cable 407 , so that the damping box 5 continues to approach the target object 3 .

[0063] The bearing base 406 is mounted on the base plate 409. The winch drum 404 passes through the base plate 409 and is movably connected to the bearing base 406. The bearing base 406 allows the winch drum 404 to rotate relative to the base plate 409, that is, the winch drum 404 can rotate on the base plate 409. The bearing base 406 is located outside the base plate 409, or is embedded in the base plate 409. The second gear 405 is located inside the base plate 409.

[0064] The self-locking assembly 408 is mounted on a base plate 409 and connected to the winch drum 404. The self-locking assembly 408 is mounted on one of the base plates 409 and is located on the other side of the winch drum 404 that faces the second gear 405. The self-locking assembly 408 is used to lock the winch drum 404 from reverse rotation, thereby restricting reverse rotation and allowing only forward rotation. When the winch drum 404 rotates forward, the lifting cable 407 wound around the winch drum 404 is in the process of being wound. When the winch drum 404 rotates backward, the lifting cable 407 wound around the winch drum 404 is in the process of being released.

[0065] When the lifting device 4 is in operation, the controller 402 controls the driver 401 to enter the operating state. The output end of the driver 401 drives the first gear 403 to rotate, which in turn drives the second gear 405 meshed with it to rotate. The second gear 405 drives the winch drum 404 to rotate forward, and the winch drum 404 rotates on its own on the base plate 409. During the forward rotation of the winch drum 404, the winch drum 404 continuously reels the lifting cable 407, thereby continuously pulling up the damping box 5 connected to the lifting cable 407 through the lifting cable 407, causing the damping box 5 to continuously approach the target object 3.

[0066] Controller 402 is connected to distance measuring device 6 to receive a distance signal indicating a first distance from distance measuring device 6. Based on the distance signal, controller 402 controls the rotational speed and number of rotations of driver 401, thereby controlling the height at which damping box 5 is pulled up by controlling the number of rotations of driver 401. Thus, controller 402 adjusts the distance between damping box 5 and target 3 as target 3 reaches different heights, ensuring that the current height of target 3 matches the current distance between damping box 5 and the target.

[0067] Exemplarily, the driver 401 is a servo motor.

[0068] Exemplarily, the lifting cable 407 is a steel strand.

[0069] Exemplarily, the first gear 403 and the second gear are circular arc gears.

[0070] Exemplarily, a position limiting protection plate (not shown) is further included. The position limiting protection plate is mounted on the winch drum 404, affixed to the second gear 405, and located outside the second gear 405, that is, on the side of the second gear 405 away from the base plate 409. The position limiting protection plate serves to limit and protect the second gear 405, preventing it from moving on the winch drum 404 and preventing it from touching the second gear 405, thus providing a protective function.

[0071] The self-locking assembly 408 includes a self-locking gear 4081, a self-locking latch 4082, a latch bearing 4083, a stopper 4084, and a self-locking spring 4085. The self-locking gear 4081 is fixedly mounted on the winch drum 404 and rotates with the winch drum 404. The self-locking gear 4081 is located on the inner side of the base plate 409 and is spaced parallel to the base plate 409.

[0072] A latch bearing 4083 is fixedly mounted on the base plate 409. One end of the self-locking latch 4082 is movably mounted on the latch bearing 4083, allowing the self-locking latch 4082 to rotate relative to the self-locking latch 4082. The other end of the self-locking latch 4082 extends between two adjacent teeth of the self-locking gear 4081, and the side of the other end abuts one of the two adjacent teeth. A stop post 4084 is fixed to the base plate 409 and spaced apart from the latch bearing 4083, interposed between the self-locking gear 4081 and the latch bearing 4083. A self-locking spring 4085 is fixedly connected to the stop post 4084 at one end and to the self-locking latch 4082 at the other end.

[0073] One of the side edges of the teeth of the self-locking gear 4081 is a bevel, and the self-locking pin 4082 is close to one end of the self-locking gear 4081. The inclination angle of the bevel coincides with the side edge of the self-locking pin 4082 close to the end of the self-locking gear 4081, so that the self-locking pin 4082 only allows the self-locking gear 4081 to rotate in the forward direction and prevents the self-locking gear 4081 from rotating in the reverse direction.

[0074] refer to Figure 6 , Figure 6 The positive rotation of the self-locking gear 4081 is clockwise. When the self-locking gear 4081 rotates clockwise (i.e., forward), the teeth of the self-locking gear 4081 can push the self-locking latch 4082 apart, allowing the self-locking gear 4081 to swing downward (clockwise) and rebound, allowing the self-locking latch 4082 to rotate relative to the latch bearing 4083. As the self-locking gear 4081 rotates, the self-locking latch 4082 is pushed away from between two adjacent teeth in the current group. Under the action of the self-locking spring 4085, the self-locking latch 4082, having been pushed away from between two adjacent teeth in the current group, falls back into between two adjacent teeth in the next group. This action is repeated until the self-locking gear 4081 stops rotating. The self-locking latch 4082, under the action of the self-locking spring 4085, falls back into between two adjacent teeth in the corresponding position, thereby allowing the winch drum 404 to rotate forward. Figure 6 One end of the self-locking pin 4082 falls exactly between two adjacent teeth, and the side of the self-locking pin 4082 fits in with the oblique side of the teeth.

[0075] When the winch drum 404 drives the self-locking gear 4081 to reverse, the teeth of the self-locking gear 4081 cannot disengage from the self-locking pin 4082 due to the obstruction of the self-locking pin 4082. The self-locking pin 4082 is always embedded between two adjacent teeth, thereby preventing the self-locking gear 4081 from reversing, thereby causing the winch drum 404 to reverse.

[0076] The self-locking component 408 only allows the winch drum 404 to rotate forward and prevents the winch drum 404 from reversing, ensuring that the winch drum 404 can only reel in the lifting cable 407 but cannot release the lifting cable 407. In this way, in the process of lifting the target object 3, when the driver 401 is powered off or fails or is unable to drive the first gear 403 to rotate due to other reasons, the self-locking component 408 can prevent the winch drum 404 from reversing, thereby preventing the lifting cable 407 from being released, thereby preventing the damping box 5 from falling and preventing the damping box 5 from falling uncontrollably.

[0077] When the target object 3 is affected by external factors and vibrates horizontally, the TMD connected to the target object 3 will vibrate relative to the target object 3. The inertial force generated by the relative vibration of the TMD will react to the target object 3, thereby suppressing the vibration of the target object 3, thereby eliminating or weakening the vibration of the target object 3 and achieving vibration control.

[0078] Among them, the lifting device 4 forms a simple pendulum-type TMD through the lifting cable 407 and the damping box 5. It is similar to a simple pendulum system, and the natural frequency of the simple pendulum system is related to the length of the pendulum. Therefore, the natural frequency of the TMD is related to the suspension length of the lifting cable 407. Therefore, by controlling the suspension length of the lifting cable 407, the natural frequency of the TMD can be controlled, thereby controlling the relative vibration of the TMD and, in turn, the vibration of the target object 3. More specifically, during the lifting construction process, the target object 3 is lifted by the hoist 1 from a low altitude (such as the ground) to a high altitude (such as reaching the target location). The natural frequency of the overall structure composed of the target object 3, the ranging device 6, the suspension cable 2, and the TMD changes with the change in the height of the target object 3. Therefore, in order to maintain the optimal frequency ratio between the TMD and the overall structure, the natural frequency of the TMD also needs to change according to the height to achieve vibration control.

[0079] The lifting device 4 can be used as a lifting device 4 with a self-locking function for lifting the target object 3, so as to achieve the lifting of the target object 3. In this embodiment, the target object 3 is a damping box 5. In actual use, the target object 3 can be other components. This prompting device can not only achieve the lifting of the target object 3, but also prevent the target object 3 from falling. In the event of a power outage or failure of the power source (i.e., the driver 401), the current height of the target object 3 can still be maintained, preventing the target object 3 from falling, thereby ensuring safety. In addition, the lifting device 4 has a simple structure, is easy to maintain, has strong practicality, is low in cost, and is suitable for large-scale promotion and use.

[0080] The vibration control device provided by the present invention can adaptively adjust the height of the damping box 5, so that it can adaptively adjust and control the vibration according to the change of the height position of the target object 3, effectively control the structure, eliminate or weaken the vibration, and achieve the purpose of eliminating or weakening the vibration caused by external interference during the lifting process of the target object 3, thereby reducing the safety impact of situations such as sudden strong winds encountered during the lifting process of the target object 3, thereby improving construction safety.

[0081] refer to Figure 7 The present invention also provides a vibration control method for the lifting construction of the target object 3. The method can be implemented based on the vibration control device or other devices with vibration control function. The method includes:

[0082] Measure the height of the target 3 at any time and determine the mass of the damping box 5.

[0083] The optimal frequency ratio and optimal damping ratio of the TMD and the supporting structure are determined based on the mass of the damping box 5. The TMD includes the damping box 5 and a lifting device 4 for lifting the damping box 5. The supporting structure includes a distance measuring device 6 for lifting the target object 3 and measuring the height of the target object 3.

[0084] Under the constraints of the optimal frequency ratio and the optimal damping ratio, the suspension length of the damping box 5 is determined based on the height of the target 3.

[0085] According to the suspension length, the damping box 5 is lifted so that at time t, the suspension length of the damping box 5 matches the height of the target object 3 to eliminate or reduce the vibration effect.

[0086] More specifically, the specific implementation process of this method includes the following steps:

[0087] Step 1: Determine the total mass M of the target object 3 and the lifting device 4 supported on the target object 3, that is, the total weight of the target object 3 and the lifting device 4. Determine the mass m of the damping box 5 based on the total mass M. Also determine the target height L of the target object 3 to be lifted. The target height L is the distance between the initial position of the target object 3 at the start of the lift and the final position at the end of the lift. This distance is also the target height L. If the initial position is the ground, the target height L is the height of the target object 3 from the ground when the lift stops.

[0088] Among them, the mass m of the damping box 5 includes the mass of the inner box 501, the mass of the outer box, the mass of all blocks 502 arranged in the annular cavity between the inner box 501 and the outer box, the mass of the liquid in the annular cavity, and also includes the mass of the embedded parts placed in the cavity of the damping box 5.

[0089] For example, the greater the mass m of the damping box 5, the better its vibration control effect on the target object 3. However, if the mass of the damping box 5 is too large, it will increase the load on the target object 3, thereby affecting construction safety. The relationship between the mass m of the damping box 5 and the total mass M can be determined based on the actual construction site conditions. The utility model inventors have found that for most application scenarios, m = μM, where μ is a coefficient, that is, μ = m / M, and is generally set to 0.005-0.03, that is, 0.005 ≤ μ ≤ 0.03.

[0090] Step 2: Based on the mass m of the damping box 5, calculate the optimal frequency ratio according to formula ① and formula ② respectively and the optimal damping ratio ξ of TMD opt , optimal frequency ratio is the ratio between the natural frequency of the TMD and the natural frequency of the load-bearing structure. The TMD includes the lifting device 4 and the damping box 5. In other words, the lifting device 4 and the damping box 5 constitute the TMD. The load-bearing structure refers to the remaining structure after removing the TMD, including the distance measuring device 6, the hoist 1, the suspension cable 2, and the target 3. In other words, after removing the TMD from the vibration control device, the remaining structure constitutes the load-bearing structure. Therefore, the load-bearing structure includes the distance measuring device 6, the hoist 1, the suspension cable 2, and the target 3.

[0091] Formula ① and formula ② are as follows:

[0092]

[0093]

[0094] Wherein, g represents the acceleration due to gravity, L is the target height, μ is the coefficient, μ = m / M, usually 0.005-0.03, that is, after determining the mass m of the damping box 5, or after determining the coefficient μ, the frequency ratio and the optimal damping ratio ξ opt Then it was confirmed.

[0095] Step 3: Based on the mass m of the damping box 5 and the optimal damping ratio ξ determined by formula ② opt In this case, the size of the damping box 5, the arrangement density of the blocks 502, and the mass of the liquid to be injected into the annular cavity, that is, the injection volume of the liquid, are determined based on the conversion formula between the damping ratio and the damping coefficient.

[0096] Among them, the conversion formula of the damping ratio ξ and the damping coefficient of the damping box can be expressed as ω is the natural frequency of the damping box, and the natural frequency is Therefore, according to the conversion formula, the target damping coefficient C of the damping box can be obtained opt , that is Target damping coefficient C opt That is, it is regarded as the optimal damping coefficient, and the damping coefficient of the damping box 5 is adjusted to the target damping coefficient C opt , so that the target damping coefficient C opt Under this condition, the TMD damping ratio reaches the optimal damping ratio ξ.

[0097] In actual application, the inventors found that considering that the structure (i.e., the target object 3) is most likely to be subjected to wind load when it is in mid-air (lifted to half of the total height), the damping box 5 satisfies the optimal damping ratio when the target object 3 is in mid-air.

[0098] The damping box 5 includes an inner box 501 and an outer box. The mass m is subtracted from the sum of the masses of the inner box 501 and the outer box to obtain the residual mass. The residual mass is the sum of the masses of the block 502, the liquid and the patching components. The number and mass of the block 502, the mass of the liquid and the mass of the patching components can be determined. When there is no need to install the patching components in the cavity of the damping box 5, the mass of the patching components is 0.

[0099] The damping coefficient is a parameter that reflects the energy dissipation characteristics of an object during vibration. The damping coefficient is generally not directly related to the natural frequency of the structure, but is related to the material and structure of the structure. In this embodiment, it is related to the amount of liquid injected, the arrangement density of the blocks 502, and the mass of the embedded components.

[0100] The damping ratio ξ′ can be expressed as: That is, the damping ratio is related to the natural frequency ω of the object structure. Therefore, the damping coefficient C is related to the material and structure of the object itself. Therefore, when the mass of the damping box 5, the viscosity of the liquid in the annular cavity, the density of the block, etc. change, the damping coefficient C will also change. In this embodiment, since the natural frequency of the TMD will also change with the change of the height of the damping box 5, the damping ratio can be adjusted to the target damping coefficient to achieve the optimal damping ratio, so that at the target damping coefficient C opt Under this condition, the damping ratio is the optimal damping ratio ξ in formula ②.

[0101] Step 4: Measure the height L of the target 3 at the current time t t .

[0102] For example, the height of the target object 3 can be determined by measuring the distance d between the target object 3 and the distance measuring device 6. Assume that the distance between the target object 3 and the distance measuring device 6 at the current time t is d t , then the height L of the target 3 at the current time tt =Ld t .

[0103] When there are multiple distance measuring devices 6 , the average value of the distances measured by the various distance measuring devices is used as the distance d, that is, the average value is the distance d.

[0104] Step 5: According to the hanging height d of the target 3 t Calculate its natural frequency ω s , combined with the optimal frequency ratio Calculate the optimal frequency of TMD Finally, the optimal suspension length l of the lifting cable 407 is calculated based on the natural frequency formula of the simple pendulum structure. opt , suspension length l opt It refers to the length of the lifting cable 407 between the lifting device 4 and the damping box 5, that is, the distance from the starting position of the winch drum 404 to the connection point between the lifting cable 407 and the damping box 5. Among them, the natural frequency ω of the target 3 at the current time t is s According to formula ③, the optimal TMD frequency ω at the current time t is obtained. best,t According to formula ④, the suspension length l at the current moment t is obtained. opt，t According to formula ⑤, we can get:

[0105]

[0106] The optimal frequency ω corresponding to any time can be calculated by formulas ③ and ④ best,t , that is, the optimal frequency ω of the TMD corresponding to the target 3 at any height can be calculated best,t , to dynamically calculate the optimal TMD frequency ω best,t .

[0107] Formulas ③ and ⑤ are adopted because the target object 3 and TMD can be approximately regarded as a simple pendulum structure. The natural frequency (i.e., the natural frequency) of the simple pendulum structure is related to its pendulum length. Therefore, Formulas ③ and ⑤ can be adopted.

[0108] Formula ⑤ can be used to determine the suspension length l of the lifting cable 407 under real-time control while maintaining the optimal frequency ratio. opt , in the process of lifting the damping box 5, the suspension length l opt Then, according to the distance measuring device 6, the hanging height of the target object 3 (the height distance from the hoist 3 to the hanging point of the target object 3) d t The lifting cable 407 is wound up by the driver 401 of the lifting device 4 to ensure the suspension length l of the lifting cable 407 opt The relationship shown in formula ⑤ is always satisfied.

[0109] Step 6: Lift the target object 3 to the target height L. After the target object 3 reaches the target height L, proceed with subsequent construction, including taking out the embedded components in the damping box 5 for assembly, and installing the target object 3 on the building body.

[0110] By executing the vibration control method formed by the above steps, it is possible to eliminate or reduce the vibration caused by the wind load on the target object 3 during the construction process of lifting the target object 3, reduce the risk of instability or damage to various structures including the target object 3, and improve the safety of construction. In addition, compared with traditional construction, it is possible to reduce the strict requirements of the construction team's external environmental conditions (such as wind force), and to carry out construction under a wider range of environmental conditions, reducing the shutdown or delay caused by bad weather including strong winds, thereby shortening the overall construction period and improving construction efficiency. This vibration control method can also be applied to the overall lifting construction of various large-span steel structures, super high-rise buildings and bridges, and can be widely used in different types of complex steel structure construction projects, with a wide range of promotion and application value.

[0111] The embodiment disclosed in this specification is merely an illustration of one aspect of the present invention. The scope of protection of the present invention is not limited to this embodiment. Any other functionally equivalent embodiments fall within the scope of protection of the present invention. Those skilled in the art can make various other corresponding changes and modifications based on the technical solutions and concepts described above, and all such changes and modifications should fall within the scope of protection of the claims of the present invention.

Claims

1. A lifting device with a self-locking function for target lifting construction, characterized in that: It includes a driver, a controller, a transmission structure, a winch drum, a lifting cable and a supporting device. The controller is electrically connected to the driver, and the driver is connected to the transmission structure for driving the transmission structure to rotate. The transmission structure is connected to the winch drum, and the winch drum is installed on the supporting device. The other end of the lifting cable is wound around the winch drum, and the other end is used to be connected to the damping box.

2. The lifting device with self-locking function for target lifting construction according to claim 1, characterized in that: The transmission structure includes a first gear and a second gear. The output end of the driver is connected to the first gear. The first gear and the second gear are meshed and connected. The first gear is located on one side of the second gear, and the second gear is sleeved on the winch drum.

3. The lifting device with self-locking function for target lifting construction according to claim 2, characterized in that: The supporting device comprises two base plates which are spaced apart and arranged in parallel, and two ends of the winch drum are rotatably mounted on the two base plates.

4. The lifting device with self-locking function for target lifting construction according to claim 3, characterized in that: The lifting device also includes a bearing base, which is installed on the base plate. The winch drum passes through the base plate and is movably connected to the bearing base.

5. The lifting device with self-locking function for target lifting construction according to claim 4, characterized in that: The bearing base is located on the outer side of the base plate, or is embedded in the base plate, and the second gear is located on the inner side of the base plate.

6. The lifting device with self-locking function for target lifting construction according to claim 5, characterized in that: The driver is a servo motor, the lifting cable is a steel strand, and the first gear and the second gear are circular arc gears.

7. The lifting device with a self-locking function for target lifting construction according to claim 6, characterized in that: The lifting device further comprises a position limiting protection plate, which is sleeved on the winch drum, and the position limiting protection plate is fitted to the second gear and is located on the outside of the second gear.

8. The lifting device with a self-locking function for target lifting construction according to claim 7, characterized in that: The lifting device also includes a self-locking component, which is installed on the supporting device and connected to the winch drum. The self-locking component is used to lock the winch drum from rotating in the reverse direction to limit the winch drum from rotating in the reverse direction and only allow the winch drum to rotate in the forward direction.

9. The lifting device with a self-locking function for target lifting construction according to claim 8, characterized in that: The self-locking assembly includes a self-locking gear, a self-locking pin, a pin bearing, a blocking column and a self-locking spring. The self-locking gear is fixedly mounted on the capstan and can rotate with the capstan. The self-locking gear is located on the inner side of the base plate and is spaced parallel to the base plate. The latch bearing is fixedly mounted on the base plate, and one end of the self-locking latch is movably mounted on the latch bearing so that the self-locking latch can rotate relative to the self-locking latch, and the other end of the self-locking latch extends between two adjacent teeth of the self-locking gear, and the side of the other end abuts against one of the two adjacent teeth. The blocking column is fixed on the base plate and spaced apart from the latch bearing. The blocking column is between the self-locking gear and the latch bearing. One end of the self-locking spring is fixedly connected to the blocking column, and the other end is fixedly connected to the self-locking latch.

10. The lifting device with a self-locking function for target lifting construction according to claim 9, characterized in that: One of the side edges of the teeth of the self-locking gear is a beveled edge, and the self-locking pin is close to one end of the self-locking gear. The inclination angle of the beveled edge matches the side edge of the self-locking pin close to the end of the self-locking gear, so that the self-locking pin only allows the self-locking gear to rotate in the forward direction and prevents the self-locking gear from rotating in the reverse direction.

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