Crane sudden unloading operation warning method and system and crane

Abstract

The invention provides a crane sudden unloading operation warning method and system and a crane, and the crane sudden unloading operation warning method comprises the following steps: obtaining the hanging load weight of the crane, and judging whether the crane is subjected to sudden unloading operation according to the change speed of the hanging load weight when the crane unloads a heavy object; acquiring specific parameters related to swing of the boom, and judging whether the crane is subjected to illegal unloading operation or not according to whether the specific parameters exceed a preset range or not when the crane is subjected to sudden unloading operation or not; and when the illegal unloading operation of the crane is judged, the alarm unit is controlled to send out corresponding alarm information. According to the crane sudden unloading operation warning method, an operator can be warned when the crane carries out illegal unloading operation, the operator is reminded to avoid repeating the illegal operation, and therefore the service life of the crane is prolonged, and the use safety of the crane is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and in particular to a method and system for warning a sudden unloading operation of a crane, and a crane. Background Art

[0002] Cranes are a common type of construction machinery. As the load of cranes increases and the lifting conditions become more complex, the safety of crane use becomes more and more important.

[0003] In the actual use of cranes, in some cases, operators violate the requirements of the operating manual and use the crane to connect external devices, such as grabs and draglines, to perform continuous sudden unloading operations or load shaking operations. Among them, sudden unloading operations refer to the separation of the heavy object from the hook in advance before the heavy object hoisted by the hook is placed in the designated position, causing the heavy object to fall. This will cause the boom to rebound violently and swing back and forth, causing some parts of the crane to fail due to fatigue in advance. In severe cases, it will cause the boom to break and even cause the entire vehicle to overturn. In view of this, it is necessary to warn operators when they perform illegal sudden unloading operations. Summary of the invention

[0004] The object of the present invention is to provide a crane sudden unloading operation warning method and system and a crane, aiming to solve or at least partially solve the deficiencies of the above-mentioned background technology. The crane sudden unloading operation warning method can warn when the crane violates the unloading operation regulations.

[0005] The present invention provides a crane sudden unloading operation warning method, comprising:

[0006] Obtain the load weight of the crane, and determine whether the crane has a sudden unloading operation based on the speed of the load weight change when the crane is unloading heavy objects;

[0007] Obtaining specific parameters related to boom swing, and judging whether the crane has performed illegal unloading operations according to whether the specific parameters exceed a preset range when the crane performs sudden unloading operations;

[0008] When it is determined that the crane has unloaded in violation of regulations, the control alarm unit sends out a corresponding alarm message.

[0009] Further, the obtaining of the hoisting weight of the crane and judging whether a sudden unloading operation of the crane occurs according to the speed of change of the hoisting weight of the crane when the crane unloads the heavy object specifically include:

[0010] Obtain the load weight M1 of the crane in the empty hook state, the load weight M2 of the crane when loading heavy objects, and the load weight M of the crane when unloading heavy objects; when the crane is unloading heavy objects, when the M decreases from the M2 to less than or equal to the M1 within a preset time, it is determined that a sudden unloading operation of the crane occurs.

[0011] Furthermore, the specific parameter is the pulling force of the boom of the crane's luffing system; when the crane performs a sudden unloading operation, if the pulling force of the boom by the luffing system exceeds a preset pulling force range, it is determined that the crane has performed an illegal unloading operation.

[0012] Furthermore, when the crane is suddenly unloading, the tension T of the boom by the luffing system f When it exceeds T1±ΔT, it is determined that the crane has performed illegal unloading operations; wherein, T1 is the pulling force of the boom system of the crane in the empty hook state, and ΔT is the safety value of the pulling force fluctuation.

[0013] Furthermore, the specific parameter is the swing amplitude of the boom, and the swing amplitude includes the swing amount of the boom and / or the swing angle of the boom; when the crane performs a sudden unloading operation, if the swing amplitude of the boom exceeds a preset swing amplitude range, it is determined that the crane has performed an illegal unloading operation.

[0014] Furthermore, when it is determined that the crane has performed an illegal unloading operation, the control system of the crane is also locked; and based on a forced release signal, the lock on the control system is released.

[0015] The present invention also provides a crane sudden unloading operation warning system applied to the above method, the crane sudden unloading operation warning system comprising:

[0016] A load weight detection device is used to detect working parameters related to the load weight of the crane;

[0017] A boom swing detection device, used to detect specific parameters related to boom swing;

[0018] An alarm unit, used for issuing an alarm message;

[0019] A control unit, connected to the load weight detection device, the boom swing detection device and the alarm unit respectively;

[0020] The control unit is used to calculate the load weight of the crane according to the operating parameters, and judge whether the crane has a sudden unloading operation according to the speed of change of the load weight when the crane unloads the heavy objects, and judge whether the crane has an illegal unloading operation according to whether the specific parameters exceed a preset range when the crane is performing a sudden unloading operation, and when it is judged that the crane has an illegal unloading operation, control the alarm unit to send out corresponding alarm information.

[0021] Further, the load weight detection device includes a torque limiter, and the torque limiter is used to detect the pulling force of the boom system on the boom;

[0022] The boom swing detection device is the torque limiter; or, the boom swing detection device is a swing amplitude detection device, and the swing amplitude detection device is used to detect the swing amount of the boom and / or the swing angle of the boom.

[0023] Furthermore, it also includes:

[0024] A forced unlock button, used to generate a forced release signal based on a user operation, and the control unit is connected to the forced unlock button;

[0025] When the control unit determines that the crane has performed an illegal unloading operation, the control unit also locks the control system of the crane; and after receiving the forced release signal generated by the forced unlocking button, the control unit releases the lock on the control system.

[0026] The present invention also provides a crane, comprising the crane sudden unloading operation warning system as described above.

[0027] The method for warning of sudden unloading operation of a crane provided by the present invention determines whether a sudden unloading operation of the crane occurs according to the speed of change of the hoisted weight of the crane when unloading heavy objects, and determines whether an illegal unloading operation of the crane occurs according to whether a specific parameter of the crane exceeds a preset range when performing the sudden unloading operation. When it is determined that the crane occurs an illegal unloading operation, the alarm unit is controlled to send out a corresponding alarm message, thereby warning the operator, warning the operator that the current operation is an illegal operation, and reminding the operator to avoid repeating the illegal operation, thereby improving the service life and safety of use of the crane; at the same time, the method can eliminate the working conditions of sudden unloading operation but not illegal unloading operation, and avoid frequent alarms affecting the operator's use experience without affecting (or almost not affecting) the life and safety of use of the crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of a crane in an embodiment of the present invention.

[0029] Figure 2Schematic diagram of control logic of a control unit in an embodiment of the present invention.

[0030] Figure 3 The figure is a schematic diagram of the working process of the method for warning of sudden unloading operation of a crane in an embodiment of the present invention.

[0031] Figure 4 The figure is a schematic diagram showing the relationship between the pulling force of the boom by the luffing system and time during normal unloading operation of the crane in an embodiment of the present invention.

[0032] Figure 5 It is a schematic diagram of the relationship between the pulling force of the boom by the luffing system and time when the crane performs illegal unloading operation in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a particular sequence or order.

[0035] The directional words such as up, down, left, right, front, back, top, bottom, etc. (if any) involved in the specification and claims of the present invention are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional words should not limit the scope of protection claimed in this application.

[0036] like Figures 1 to 3 As shown, an embodiment of the present invention provides a method for warning a sudden unloading operation of a crane, comprising:

[0037] Obtain the load weight of the crane, and determine whether the crane has a sudden unloading operation according to the speed of change of the load weight when the crane unloads the heavy object 7 (i.e., the load);

[0038] Acquire specific parameters related to the swing of the boom 4, and determine whether the crane has performed an illegal unloading operation according to whether the specific parameters exceed a preset range when the crane performs a sudden unloading operation;

[0039] When it is determined that the crane has unloaded in violation of regulations, the control alarm unit 83 sends out a corresponding alarm message.

[0040] The method for warning of sudden unloading operation of a crane provided in an embodiment of the present invention determines whether a sudden unloading operation of the crane occurs according to the speed of change of the load weight when the crane unloads a heavy object 7, and determines whether an illegal unloading operation of the crane occurs according to whether a specific parameter of the crane exceeds a preset range when performing the sudden unloading operation. When it is determined that the crane occurs an illegal unloading operation, the alarm unit 83 is controlled to send a corresponding alarm message, thereby warning the operator that the current operation is an illegal operation, and reminding the operator to avoid repeating the illegal operation, thereby improving the service life and safety of the crane. At the same time, the method can eliminate sudden unloading operations but not illegal unloading operations (for example, when suddenly unloading a small weight object), and avoid frequent alarms affecting the operator's experience without affecting (or almost not affecting) the life and safety of the crane.

[0041] Among them, sudden unloading operation refers to the separation of heavy object 7 from hook 6 in advance to make heavy object 7 fall down when the heavy object 7 carried by hook 6 has not been placed in the designated position; if the weight of heavy object 7 is heavy at this time, sudden unloading will cause boom 4 to rebound violently and swing back and forth, causing some parts of the crane to fail prematurely due to fatigue. In severe cases, it will also cause boom 4 to break, and even the whole vehicle to overturn. At this time, it is necessary to determine that the current working condition is an illegal unloading operation. When the weight of heavy object 7 is smaller than the maximum rated lifting capacity of the crane, for example, the maximum rated lifting capacity of the crane is 50 tons, and the weight of heavy object 7 is 100kg, then the sudden unloading operation of the crane will hardly affect the crane, and the swing amplitude of the crane's boom 4 is very small, so the current working condition can be determined as a normal unloading operation (i.e., a non-illegal unloading operation).

[0042] The main difficulties in determining whether a crane has performed an illegal unloading operation are: 1. How to determine when a sudden unloading operation occurs (i.e., distinguishing sudden unloading operations from normal unloading operations); 2. How to determine whether a sudden unloading operation causes harm and risks to the crane.

[0043] In view of the first point above, this embodiment determines whether a sudden unloading operation of the crane occurs by obtaining the load weight of the crane and judging the speed of change of the load weight of the crane when the crane unloads the heavy object 7. The steps specifically include:

[0044] The load weight M1 of the crane in the empty hook state, the load weight M2 of the crane when loading the heavy object 7 (M2 is equal to M1 plus the weight of the heavy object 7), and the load weight M of the crane when unloading the heavy object 7 are obtained respectively; when the crane unloads the heavy object 7, when the M decreases from the M2 to less than or equal to the M1 within a preset time (a very short time), it is judged that the crane has a sudden unloading operation; when the crane unloads the heavy object 7, when the time consumed for the M to decrease from the M2 to less than or equal to the M1 exceeds the preset time, it is judged that the crane has not a sudden unloading operation (that is, it is a normal unloading operation).

[0045] Specifically, M1 refers to the load weight before the hook 6 lifts the weight 7, and at this time M1 is the sum of the weights of the wire rope 5 and the hook 6; M2 refers to the load weight after the hook 6 lifts the weight 7, and at this time M2 is the sum of the weights of the wire rope 5, the hook 6 and the weight 7.

[0046] The load weight of the crane can be calculated based on the model of the hook 6 (thus determining the weight of the hook 6), the multiple of the wire rope 5, the amplitude (referring to the distance between the weight 7 and the center of the whole machine structure 1), the arm length (i.e. the length of the boom 4), the angle of the boom 4 (referring to the tilt angle of the boom 4) and the tension of the boom 4 by the variable amplitude system 2 (referring to the tension of the top of the boom 4 by the variable amplitude system 2). Among them, the model of the hook 6, the multiple of the wire rope 5, the amplitude, the arm length and the angle of the boom 4 can be obtained by manual input, sensor detection, etc., and the specific acquisition method is not limited here; the tension of the boom 4 by the variable amplitude system 2 can be detected by a torque limiter (not shown in the figure), and the variable amplitude system 2 is connected to the top of the boom 4 through the inclined pull mechanism 3, the inclined pull mechanism 3 is generally a pull plate, and the torque limiter is generally arranged on the inclined pull mechanism 3 (generally arranged between the pull plate and the top of the boom 4). The above parameters and components are all existing parameters and components on the crane; the calculation method of the crane load weight can be referred to the existing technology and will not be repeated here.

[0047] When the crane is unloading, the load weight of the crane will eventually decrease from M2 to M1 (since the boom 4 will rebound during the unloading process, the measured load weight may be less than M1). When the crane is unloading normally, the hook 6 will slowly place the weight 7 at the specified position. At this time, the time it takes for M to decrease from M2 to less than or equal to M1 is relatively long, generally at least tens of seconds; and when the crane is unloading suddenly, the hook 6 will instantly separate from the weight 7. At this time, M will suddenly change from M2 to less than or equal to M1 in a very short time. Therefore, by judging the speed of the change of M from M2 to less than or equal to M1, it can be judged whether a sudden unloading operation has occurred. Among them, the above-mentioned preset time can be set according to actual conditions. For example, the preset time can be set to be less than or equal to 1 / 10 of the time consumed by the crane for M to decrease from M2 to less than or equal to M1 during normal unloading operation (because the present embodiment calculates the hoisting weight of the crane through the torque limiter, the response time of the torque limiter is generally in milliseconds; during sudden unloading operations, the mutation time of M is also the response time of the torque limiter, so the mutation time of M is extremely short), specifically less than or equal to 2 seconds, less than or equal to 1 second, etc.

[0048] Regarding the second point above, this embodiment determines whether the crane has performed an illegal unloading operation by obtaining specific parameters related to the swing of the boom 4 and judging whether the specific parameters exceed a preset range when the crane performs a sudden unloading operation.

[0049] In this embodiment, the specific parameter is the pulling force of the luffing system 2 of the crane on the boom 4; wherein, the pulling force of the luffing system 2 on the boom 4 can be detected by the above-mentioned torque limiter. When the crane performs a sudden unloading operation, if the pulling force of the luffing system 2 on the boom 4 exceeds the preset pulling force range, it is determined that the crane has performed an illegal unloading operation; when the crane performs a sudden unloading operation, if the pulling force of the luffing system 2 on the boom 4 does not exceed the preset pulling force range, it is determined that the crane has not performed an illegal unloading operation.

[0050] like Figure 5 As shown, in this embodiment, when the crane performs a sudden unloading operation, when the pulling force T of the luffing system 2 on the boom 4 f When the tension T1±ΔT exceeds T1±ΔT (i.e., the above-mentioned preset tension range is T1±ΔT), it is determined that the crane has violated the unloading operation; when the tension T of the luffing system 2 on the boom 4 f If it does not exceed T1±ΔT, it is determined that the crane has not performed illegal unloading operations. Wherein, T1 is the pulling force of the boom 4 by the variable-length system 2 when the crane is in an empty hook state (i.e., when the hook 6 has not yet lifted the weight 7); ΔT is the pulling force fluctuation safety value, which can be set according to actual conditions, for example, calculated by a multi-body dynamics simulation model or obtained by experiment (ΔT is generally related to the boom length).

[0051] Specifically, when the crane is hoisting, due to the weight of the heavy object 7, the luffing system 2, the boom 4 and other structural parts will undergo elastic deformation and store elastic potential energy; the heavier the heavy object 7, the greater the stored elastic potential energy.

[0052] like Figure 4 As shown, during normal unloading operation, the crane slowly releases the wire rope 5 to slowly place the weight 7 at the designated position. At this time, the elastic potential energy stored in the boom 4 and other components is slowly released, and the pulling force T of the luffing system 2 on the boom 4 is f It will fluctuate within T1±ΔT and stop fluctuating in a relatively short time.

[0053] like Figure 5 As shown, when the crane is suddenly unloading, if the weight of the heavy object 7 is large at this time, due to the large elastic potential energy stored in the boom 4 and other components, after the heavy object 7 is suddenly released, the elastic potential energy stored in the boom 4 and other components is released in a very short time, causing the boom 4 to rebound violently and swing back and forth, affecting the life and working safety of the boom 4 and other components, and causing the tension value detected by the torque limiter to fluctuate greatly, that is, the tension T of the boom 4 by the luffing system 2 is greater than that of the boom 4. f It will exceed T1±ΔT, which is used to judge that the crane has violated the unloading operation. When the crane is suddenly unloading, if the weight of the heavy object 7 is small at this time, due to the small elastic potential energy stored in the boom 4 and other components, after the heavy object 7 is suddenly released, the swing of the boom 4 is small, which will hardly affect the life and work safety of the boom 4 and other components. At the same time, the tension value detected by the torque limiter fluctuates little, that is, the tension T of the variable amplitude system 2 on the boom 4 f It will not exceed T1±ΔT, so it is judged that the crane has not performed illegal unloading operation. Therefore, it can be judged whether the crane has performed illegal unloading operation by judging whether the pulling force of the boom 4 by the luffing system 2 exceeds the preset pulling force range when the crane performs sudden unloading operation.

[0054] Figure 4 and Figure 5The diagram of the relationship between the tension of the boom 4 by the mid-length-changing system 2 and time is only used to explain the judgment logic of this embodiment. The curve change of the actual lifting process and the magnitude of the tension value during lifting may be different, but the principle of the change of the tension value after unloading is the same. In the figure, h0 refers to the moment when the hook 6 is connected and fixed with the weight 7 and is ready to be lifted. At this time, the tension of the boom 4 by the length-changing system 2 is T0; between 0 and h0, it refers to the tension of the boom 4 by the length-changing system 2 from the installation condition to the working condition, which is not shown in the figure; h1 refers to the moment when the weight 7 is lifted to the specified position and unloading begins, at which time the tension of the boom 4 by the length-changing system 2 is T; between h0 and h1, the tension of the boom 4 by the length-changing system 2 varies, which will not be described in detail here; h2 refers to the moment when the weight 7 is completely unloaded and the boom 4 stops swinging, at which time the tension of the boom 4 by the length-changing system 2 is T1.

[0055] It should be noted that the reason why the present embodiment does not use the pulling force of the luffing system 2 on the boom 4 to determine whether a sudden unloading operation of the crane occurs is that after the crane lifts the heavy object 7, when performing operations such as rotation and luffing (especially luffing operations), the pulling force of the luffing system 2 on the boom 4 will fluctuate greatly; therefore, using the pulling force of the luffing system 2 on the boom 4 to determine whether a sudden unloading operation of the crane occurs may result in misjudgment, which may affect the accuracy of use under some working conditions.

[0056] In another embodiment, the specific parameter is the swing amplitude of the boom 4, and the swing amplitude includes the swing amount (i.e., the swing distance) of the boom 4 and / or the swing angle of the boom 4. The swing amplitude of the boom 4 can be detected by a swing amplitude detection device (not shown) (the swing amplitude detection device can specifically be a swing amount detection device, a swing angle detection device, etc.), and the swing amplitude detection device is arranged on the boom 4. The swing amplitude detection device is preferably arranged at the top end (i.e., the arm head) of the boom 4, that is, the swing amplitude of the top end of the boom 4 is detected by the swing amplitude detection device, so as to obtain more accurate swing amplitude data.

[0057] When the crane performs a sudden unloading operation, if the swing amplitude of the boom 4 exceeds the preset swing amplitude range (the preset swing amplitude range can be set according to actual conditions), it is judged that the crane has performed an illegal unloading operation; when the crane performs a sudden unloading operation, if the swing amplitude of the boom 4 does not exceed the preset swing amplitude range, it is judged that the crane has not performed an illegal unloading operation.

[0058] Specifically, when the crane is suddenly unloading, if the weight of the heavy object 7 is relatively large, due to the large elastic potential energy stored in the boom 4 and other components, after the heavy object 7 is suddenly released, the elastic potential energy stored in the boom 4 and other components is released in a very short time, causing the boom 4 to rebound violently and swing back and forth. At this time, the swing amplitude detection device detects that the swing amplitude of the boom 4 exceeds the preset swing amplitude range, thereby judging that the crane has unloaded in violation of regulations. When the crane is suddenly unloading, if the weight of the heavy object 7 is relatively small, due to the small elastic potential energy stored in the boom 4 and other components, after the heavy object 7 is suddenly released, the swing of the boom 4 is relatively small. At this time, the swing amplitude detection device detects that the swing amplitude of the boom 4 does not exceed the preset swing amplitude range, thereby judging that the crane has not unloaded in violation of regulations.

[0059] Of course, in other embodiments, the above-mentioned specific parameters related to the swing of the boom 4 may also be other parameters, as long as they can reflect the swing intensity of the boom 4 .

[0060] Furthermore, in this embodiment, the crane sudden unloading operation warning method further includes:

[0061] When it is determined that the crane has performed an illegal unloading operation, the control system 85 of the crane is also locked; and based on the forced release signal, the lock on the control system 85 is released.

[0062] Specifically, when it is determined that the crane has unloaded illegally, in order to avoid safety risks caused by operator misoperation after the unloading is illegal, and to improve the warning level for the operator, the control system 85 of the crane is locked (under some extreme working conditions, such as the crane tipping over, locking the control system 85 of the crane can also prevent the crane from continuing to move and expanding the accident). At this time, the operator needs to press the forced unlock button 84 to generate a forced release signal to unlock the control system 85. Among them, the control system 85 includes the crane's slewing control system, hook lifting control system, luffing control system, driving control system, etc., that is, after the control system 85 is locked, the crane cannot perform actions such as slewing, hook lifting, luffing, and driving.

[0063] Furthermore, in this embodiment, when it is determined that the crane has unloaded in violation of regulations, after the control alarm unit 83 issues a corresponding alarm message, the alarm of the alarm unit 83 is also canceled based on the alarm cancel signal. Specifically, after the control alarm unit 83 issues a corresponding alarm message, the operator needs to press an alarm cancel button (not shown) to generate an alarm cancel signal, so that the alarm of the alarm unit 83 can be canceled.

[0064] Furthermore, in this embodiment, when it is determined that the crane has performed an illegal unloading operation, the current operating parameters (including the model of the hook 6, the multiple, amplitude, arm length, angle of the boom 4, the pulling force of the boom system 2 on the boom 4, etc.) and time are also recorded to facilitate subsequent tracing of the situation during the illegal unloading operation.

[0065] like Figure 1 and Figure 2 As shown, an embodiment of the present invention further provides a crane sudden unloading operation warning system applied to the above-mentioned crane sudden unloading operation warning method, and the crane sudden unloading operation warning system includes:

[0066] A load weight detection device 81 is used to detect working parameters related to the load weight of the crane;

[0067] The boom swing detection device 82 is used to detect specific parameters related to the swing of the boom 4;

[0068] An alarm unit 83, used to issue an alarm message;

[0069] The control unit 80 is respectively connected to the load weight detection device 81, the boom swing detection device 82 and the alarm unit 83 (specifically, an electrical signal connection);

[0070] The control unit 80 is used to calculate the load weight of the crane according to the operating parameters, and to determine whether the crane has a sudden unloading operation according to the speed of change of the load weight when the crane unloads the heavy object 7, and to determine whether the crane has an illegal unloading operation according to whether the specific parameters exceed a preset range when the crane is performing a sudden unloading operation, and when it is determined that the crane has an illegal unloading operation, control the alarm unit 83 to send a corresponding alarm message.

[0071] Furthermore, in this embodiment, the load weight detection device 81 includes a torque limiter, which is used to detect the tension of the boom 4 applied by the boom system 2 (that is, the above-mentioned operating parameters include the tension of the boom 4 applied by the boom system 2); the control unit 80 calculates the load weight of the crane through the tension detected by the torque limiter, combined with information such as the model of the hook 6, the multiple, amplitude, arm length, and angle of the wire rope 5.

[0072] Furthermore, in this embodiment, the boom swing detection device 82 is the above-mentioned moment limiter, that is, the above-mentioned specific parameter is the pulling force of the boom 4 by the luffing system 2 of the crane; the control unit 80 determines whether the crane has an illegal unloading operation according to whether the pulling force of the luffing system 2 on the boom 4 exceeds the preset pulling force range when the crane performs a sudden unloading operation. Since the moment limiter is an existing component on the crane, there is no need to set up other detection devices.

[0073] In another embodiment, the boom swing detection device 82 is a swing amplitude detection device, which is used to detect the swing amount of the boom 4 and / or the swing angle of the boom 4. The control unit 80 determines whether the crane has performed an illegal unloading operation according to whether the swing amplitude of the boom 4 exceeds a preset swing amplitude range when the crane performs a sudden unloading operation.

[0074] Furthermore, in this embodiment, the alarm unit 83 includes a display device (not shown) and an audible and visual alarm (not shown); when it is determined that the crane has an illegal unloading operation, the control unit 80 controls the display device to issue a danger pop-up window warning (i.e., display the alarm information), and controls the audible and visual alarm to issue an audible and visual alarm. At the same time, the alarm unit 83 is also provided with an alarm release button (not shown), which is connected to the control unit 80. When the alarm unit 83 issues a corresponding alarm message, the operator generates an alarm release signal after pressing the alarm release button. After receiving the alarm release signal, the control unit 80 releases the alarm of the alarm unit 83.

[0075] Furthermore, in this embodiment, the crane sudden unloading operation warning system also includes:

[0076] A forced unlock button 84 is used to generate a forced release signal based on a user operation. The control unit 80 is also connected to the forced unlock button 84 and the control system 85 of the crane (specifically, an electrical signal connection);

[0077] When the control unit 80 determines that the crane has performed an illegal unloading operation, the control unit 80 also locks the control system 85 of the crane; and the operator generates a forced release signal after pressing the forced unlocking button 84. After receiving the forced release signal generated by the forced unlocking button 84, the control unit 80 releases the lock on the control system 85.

[0078] Among them, the alarm release button and the forced unlock button 84 can be set in the cockpit of the crane. Both can be physical switches or virtual switches. The alarm release button and the forced unlock button 84 can specifically be control elements such as buttons, knobs, virtual buttons, etc. set on the crane.

[0079] Furthermore, in this embodiment, when the control unit 80 determines that the crane has performed an illegal unloading operation, the control unit 80 also records the current operating parameters (including the model of the hook 6, the ratio, amplitude, arm length, angle of the boom 4, the pulling force of the boom system 2 on the boom 4, etc.) and time, so as to facilitate the subsequent tracing of the situation during the illegal unloading operation.

[0080] Furthermore, in this embodiment, the control unit 80 may be an existing control device on the crane, or an additional control device.

[0081] like Figure 1 As shown, an embodiment of the present invention further provides a crane, including the crane sudden unloading operation warning system as described above. The crane can specifically be a crawler crane, a wheel crane, etc.

[0082] Furthermore, in this embodiment, the crane further includes a complete machine structure 1 (the complete machine structure 1 specifically includes a chassis and a turntable disposed on the chassis, etc.), a luffing system 2, a diagonal stay mechanism 3, a boom 4, a wire rope 5, a hook 6, etc. The bottom end of the boom 4 is connected to the complete machine structure 1, the luffing system 2 is disposed on the complete machine structure 1, and the luffing system 2 is connected to the top end of the boom 4 through the diagonal stay mechanism 3. One end of the wire rope 5 is connected to a winch (not shown) on the complete machine structure 1, and the other end is connected to a hook 6, which is used to hoist a heavy object 7. For the specific structure of the crane, please refer to the prior art, which will not be described here.

[0083] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for warning a sudden unloading operation of a crane, characterized in that: include: Obtain the load weight of the crane, and determine whether the crane has a sudden unloading operation based on the speed of the load weight change when the crane is unloading heavy objects; Obtaining specific parameters related to boom swing, and judging whether the crane has performed illegal unloading operations according to whether the specific parameters exceed a preset range when the crane performs sudden unloading operations; When it is determined that the crane has unloaded in violation of regulations, the control alarm unit sends out a corresponding alarm message.

2. The crane sudden unloading operation warning method according to claim 1, characterized in that: The obtaining of the hoisting weight of the crane and judging whether a sudden unloading operation of the crane occurs according to the speed of change of the hoisting weight of the crane when the crane unloads the heavy object specifically include: Obtain the load weight M1 of the crane in the empty hook state, the load weight M2 of the crane when loading heavy objects, and the load weight M of the crane when unloading heavy objects; when the crane is unloading heavy objects, when the M decreases from the M2 to less than or equal to the M1 within a preset time, it is determined that a sudden unloading operation of the crane occurs.

3. The crane sudden unloading operation warning method according to claim 1, characterized in that: The specific parameter is the pulling force of the boom of the crane's luffing system; when the crane performs a sudden unloading operation, if the pulling force of the boom by the luffing system exceeds a preset pulling force range, it is determined that the crane has performed an illegal unloading operation.

4. The crane sudden unloading operation warning method according to claim 3, characterized in that: When the crane is suddenly unloading, the pulling force T of the boom by the luffing system f When it exceeds T1±ΔT, it is judged that the crane has performed illegal unloading operations; wherein, T1 is the pulling force of the boom system of the crane in the empty hook state, and ΔT is the safety value of the pulling force fluctuation.

5. The crane sudden unloading operation warning method according to claim 1, characterized in that: The specific parameter is the swing amplitude of the boom, and the swing amplitude includes the swing amount of the boom and / or the swing angle of the boom; when the crane performs a sudden unloading operation, if the swing amplitude of the boom exceeds a preset swing amplitude range, it is determined that the crane has performed an illegal unloading operation.

6. The crane sudden unloading operation warning method according to any one of claims 1 to 5, characterized in that: When it is determined that the crane has performed an illegal unloading operation, the control system of the crane is also locked; and based on a forced release signal, the lock on the control system is released.

7. A crane sudden unloading operation warning system applied to the method as claimed in any one of claims 1 to 6, characterized in that: The crane sudden unloading operation warning system comprises: A load weight detection device is used to detect working parameters related to the load weight of the crane; A boom swing detection device, used to detect specific parameters related to boom swing; An alarm unit, used for issuing an alarm message; A control unit, connected to the load weight detection device, the boom swing detection device and the alarm unit respectively; The control unit is used to calculate the load weight of the crane according to the operating parameters, and judge whether the crane has a sudden unloading operation according to the speed of change of the load weight when the crane unloads the heavy objects, and judge whether the crane has an illegal unloading operation according to whether the specific parameters exceed a preset range when the crane is performing a sudden unloading operation, and when it is judged that the crane has an illegal unloading operation, control the alarm unit to send out corresponding alarm information.

8. The crane sudden unloading operation warning system according to claim 7, characterized in that: The load weight detection device includes a torque limiter, which is used to detect the pulling force of the boom system on the boom; The boom swing detection device is the torque limiter; or, the boom swing detection device is a swing amplitude detection device, and the swing amplitude detection device is used to detect the swing amount of the boom and / or the swing angle of the boom.

9. The crane sudden unloading operation warning system according to claim 7 or 8, characterized in that: Also includes: A forced unlock button, used to generate a forced release signal based on a user operation, and the control unit is connected to the forced unlock button; When the control unit determines that the crane has performed an illegal unloading operation, the control unit also locks the control system of the crane; and after receiving the forced release signal generated by the forced unlocking button, the control unit releases the lock on the control system.

10. A crane, characterized in that: The invention comprises a crane sudden unloading operation warning system as claimed in any one of claims 7 to 9.

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