Method and system for automatically setting weight of balancing weight and crane

Abstract

The invention provides an automatic counterweight weight setting method and system and a crane. The method comprises the steps that the actual weight A of a counterweight assembly hung on a rotary table is obtained through a first weight detection unit; the weight B of the counterweight assembly on the crane is obtained through the second weight detection unit, the weight D of the counterweight assembly borne by the counterweight support is obtained through the third weight detection unit, and therefore the theoretical weight A'of the counterweight assembly hung on the rotary table is obtained; comparing and analyzing the actual weight A and the theoretical weight A'of the counterweight component hung on the rotary table, if the relative error of the two weights is within the allowance, setting the operation condition of the crane according to the actual weight A of the counterweight component hung on the rotary table, and if the relative error of the two weights is beyond the allowance, setting the operation condition of the crane according to the actual weight A of the counterweight component hung on the rotary table. If yes, an operator is reminded to check and adjust the actual weight A of the balance weight assembly hung on the rotary table.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to a method and system for automatically setting the weight of a counterweight, and a crane. Background Art

[0002] As the tonnage of cranes continues to increase, their lifting capacity has been significantly enhanced, but this is also accompanied by a significant increase in the demand for counterweights. Due to the chassis carrying capacity of medium and large tonnage cranes and the strict restrictions of road regulations, cranes cannot carry all the required counterweights on the road at one time. Therefore, the counterweight is designed to be detachable and further refined into multiple combinable modules. This combined counterweight design not only meets the weight configuration requirements of the crane under different working conditions, but also takes into account the chassis axle load matching, road compliance and transportation convenience.

[0003] However, when the current crane is setting the working condition before operation, the selection of the counterweight weight is completely dependent on the operator's manual operation. This requires the operator to accurately understand the current counterweight combination and its corresponding weight, and then select the corresponding lifting working condition. In this process, human factors play a dominant role. Once the operator makes a wrong choice due to negligence, misjudgment or lack of relevant knowledge, it may cause serious safety problems. For example, when the counterweight weight required for the selected working condition is greater than the actual mounted weight, the crane's safety operating device (torque limiter) will fail and cannot effectively prevent overload operation, thereby increasing the risk of the crane tipping over and causing immeasurable losses.

[0004] In view of the above problems, the existing crane counterweight setting method has obvious deficiencies in efficiency and safety. The industry urgently needs a method that can automatically, quickly and accurately complete the counterweight setting to reduce the risk of human operating errors and improve the safety and efficiency of crane operations. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the first aspect of the present application provides a method for automatically setting the weight of a counterweight, comprising: The actual weight A of the counterweight assembly mounted on the turntable is obtained by a first weight detection unit; The weight B of the counterweight assembly on the crane is obtained through the second weight detection unit, and the weight D of the counterweight assembly carried by the counterweight bracket is obtained through the third weight detection unit, thereby obtaining the theoretical weight A' of the counterweight assembly hung on the turntable; The actual weight A and theoretical weight A' of the counterweight assembly mounted on the turntable are compared and analyzed. If the relative error between the two is within the tolerance, the crane operation condition is set according to the actual weight A of the counterweight assembly mounted on the turntable. If the relative error between the two is outside the tolerance, the operator is reminded to check and adjust the actual weight A of the counterweight assembly mounted on the turntable.

[0006] Further, obtaining the weight B of the counterweight assembly on the crane by the second weight detection unit includes: The whole crane weight C is obtained by a second weight detection unit arranged on the chassis leg, and the whole crane weight C is compared with the bare crane weight C' (crane weight excluding the counterweight assembly) stored in the storage module to obtain the weight B of the counterweight assembly on the crane.

[0007] Furthermore, the step of obtaining the weight B of the counterweight assembly on the crane by the second weight detection unit further includes: If the bare weight C' of the crane changes, the counterweight assembly on the crane is removed, the crane weight at this time is obtained by the second weight detection unit arranged on the chassis leg, and the crane weight is stored in the storage module as the bare weight C' of the crane.

[0008] Furthermore, the actual weight A of the counterweight assembly mounted on the turntable and the theoretical weight A' are compared and analyzed using the following formula: δ=(A-A') / A, wherein δ is the relative error between the actual weight A and the theoretical weight A'.

[0009] Furthermore, the method also includes: if the relative error between the actual weight A of the counterweight assembly mounted on the turntable and the theoretical weight A' is outside the tolerance, the operator can manually force the actual weight A to be adjusted through the human-computer interaction module after confirming the actual weight A of the counterweight assembly mounted on the turntable.

[0010] A second aspect of the present application provides a counterweight weight automatic setting system for implementing the above-mentioned counterweight weight automatic setting method, including a control module, a storage module electrically connected to the control module, a human-computer interaction module, a first weight detection unit, a second weight detection unit and a third weight detection unit, wherein the first weight detection unit is used to detect the actual weight A of the counterweight assembly hung on the turntable, the second weight detection unit is arranged on the chassis leg, and is used to detect the weight B of the counterweight assembly on the crane, and the third weight detection unit is arranged on the counterweight bracket, and is used to detect the weight D of the counterweight assembly carried by the counterweight bracket.

[0011] Furthermore, the counterweight assembly includes a counterweight I arranged on a counterweight base plate and a detachable counterweight II arranged on a turntable, the counterweight base plate is connected to the turntable through a counterweight cylinder, and the first weight detection unit includes an oil pressure sensor arranged on the counterweight cylinder and a weighing sensor arranged on the turntable.

[0012] Furthermore, the second weight detection unit is an oil pressure sensor arranged in a vertical oil cylinder of the chassis leg.

[0013] Furthermore, the second weight detection unit is a weighing sensor arranged at the bottom of the chassis leg.

[0014] The third aspect of the present application provides a crane, including a chassis, a turntable and a counterweight cylinder, the top of the counterweight cylinder is detachably connected to the turntable, and the bottom of the counterweight cylinder is connected to a counterweight base plate for carrying a counterweight assembly, chassis legs are respectively provided at the four corners of the chassis, and a counterweight bracket for supporting the counterweight base plate is provided on the top of the chassis, and the crane also includes the above-mentioned counterweight automatic weight setting system.

[0015] Compared with the prior art, the beneficial effects of this application are: The present application directly detects the actual weight of the counterweight assembly mounted on the turntable through the weighing sensor on the turntable and the oil pressure sensor of the counterweight cylinder, and indirectly calculates the theoretical weight of the counterweight assembly mounted on the turntable through the oil pressure sensor installed on the chassis leg and the weighing sensor on the counterweight bracket, and verifies the actual counterweight weight directly detected, so as to achieve accurate detection; thus, the crane operating condition is set according to the actual weight of the counterweight assembly mounted on the turntable, and automatic setting of various combined counterweights is realized, so as to reduce the risk of crane tipping due to human operating errors and improve the safety and efficiency of crane operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of the method for automatically setting the weight of the counterweight of the present application; Figure 2 is a flow chart of obtaining the weight B of a counterweight assembly on a crane in the present application; Figure 3 It is a structural block diagram of the automatic setting system of the counterweight weight of the present application; Figure 4 is a schematic structural diagram of a counterweight assembly of a crane of the present application; Figure 5 It is a structural schematic diagram of the chassis of the crane of the present application; Description of reference numerals: 1. Turntable; 2. Counterweight cylinder; 3. Counterweight assembly; 31. Counterweight I; 32. Counterweight II; 4. Chassis; 5. Chassis legs; 6. Counterweight bracket; 7. Setting system; 71. Control module; 72. Storage module; 73. Human-computer interaction module; 74. First weight detection unit; 741. Oil pressure sensor; 742. Weighing sensor; 75. Second weight detection unit; 76. Third weight detection unit. DETAILED DESCRIPTION

[0017] refer to Figure 1 As shown, this embodiment provides a method for automatically setting the weight of a counterweight, the method comprising steps S10 to S30: In step S10 , the actual weight A of the counterweight assembly 3 mounted on the turntable 1 is acquired by the first weight detection unit 74 .

[0018] In some embodiments, the counterweight assembly 3 includes a counterweight I 31 arranged on a counterweight support plate and a counterweight II 32 which is detachably arranged on the turntable 1, wherein the counterweight support plate is connected to the turntable 1 via a counterweight cylinder 2, and the first weight detection unit 74 includes an oil pressure sensor 741 arranged on the counterweight cylinder 2 and a weighing sensor 742 arranged on the turntable 1.

[0019] In some embodiments, the oil pressure sensor 741 transmits the detected pressure of the counterweight cylinder 2 to the control module 71, and the control module 71 calculates the weight of the counterweight I 31 carried by the counterweight support plate through the pressure of the counterweight cylinder 2; the weighing sensor 742 transmits the detected weight of the counterweight II 32 to the control module 71, and the control module 71 sums up the weight of the counterweight II 32 and the weight of the counterweight I 31 to obtain the actual weight A of the counterweight assembly 3 hung on the turntable 1.

[0020] In step S20, the weight B of the counterweight assembly 3 on the crane is obtained by the second weight detection unit 75, and the weight D of the counterweight assembly 3 carried by the counterweight bracket 6 is obtained by the third weight detection unit 76, thereby obtaining the theoretical weight A' of the counterweight assembly 3 hung on the turntable 1.

[0021] In step S30, the actual weight A and theoretical weight A' of the counterweight assembly 3 mounted on the turntable 1 are compared and analyzed. If the relative error between the two is within the tolerance, the crane operating condition is set according to the actual weight A of the counterweight assembly 3 mounted on the turntable 1. If the relative error between the two is outside the tolerance, the operator is reminded to check and adjust the actual weight A of the counterweight assembly 3 mounted on the turntable 1.

[0022] Specifically, the actual weight A and theoretical weight A' of the counterweight assembly 3 mounted on the turntable 1 are compared and analyzed using the following formula: δ=(A-A') / A, where δ is the relative error between the actual weight A and the theoretical weight A'. When δ is less than or equal to the tolerance, the control module 71 automatically sets the working condition according to the actual weight A of the counterweight assembly 3 mounted on the turntable 1, and calls out the corresponding lifting performance table, and controls the torque limiter to control the lifting operation according to the called-up lifting performance table. When δ is greater than the tolerance, the user is prompted to confirm the actual weight A of the counterweight assembly 3 mounted on the turntable 1. After confirmation, the control module 71 sets the working condition according to the actual weight A of the counterweight assembly 3 mounted on the turntable 1.

[0023] Furthermore, when δ is greater than the tolerance, if it is caused by a fault such as damage to the sensor or line, and the fault cannot be eliminated temporarily, the operator can manually and forcibly adjust the actual weight A through the human-computer interaction module 73 after confirming the actual weight A of the counterweight assembly 3 mounted on the turntable 1. When the system is started again, a prompt will be given to confirm, so as to avoid manual setting errors until the fault is eliminated.

[0024] like Figure 2 As shown, the process of obtaining the weight B of the counterweight assembly 3 on the crane through the second weight detection unit 75 includes steps S21 to S22.

[0025] In step S21 , the whole machine weight C of the crane is obtained by the second weight detection unit 75 disposed on the chassis legs 5 .

[0026] In some embodiments, chassis legs 5 are respectively provided at the four corners of the crane chassis 4, and vertical oil cylinders are provided on the chassis legs 5. The second weight detection unit 75 is an oil pressure sensor 741 in the vertical oil cylinder of the chassis legs 5. When the combined counterweight assembly 3 is hung on the crane, the oil pressure sensor 741 transmits the detected pressure of the vertical oil cylinder of the chassis legs 5 to the control module 71, and the control module 71 calculates the whole weight C of the crane (including the weight of the crane including the counterweight assembly 3) through the pressure of the vertical oil cylinder of the chassis legs 5.

[0027] In some embodiments, chassis legs 5 are respectively provided at the four corners of the crane chassis 4, and vertical cylinders are provided on the chassis legs 5. The second weight detection unit 75 is a weighing sensor 742 at the bottom of the chassis legs 5. When the combined counterweight assembly 3 is hung on the crane, the weighing sensor 742 transmits the detected crane weight to the control module 71, and the control module 71 determines the crane weight detected by the weighing sensor 742 as the whole crane weight C (including the crane weight of the counterweight assembly 3).

[0028] In step S22, the whole machine weight C is compared with the bare machine weight C' (the weight of the crane excluding the counterweight assembly 3) stored in the storage module 72 to obtain the weight B of the counterweight assembly 3 on the crane.

[0029] In some embodiments, before the crane leaves the factory, when the crane does not carry any counterweight, the commissioning personnel sets the bare weight C' through the human-machine interaction module 73. Specifically, the commissioning personnel clicks the human-machine interaction module 73 to enter the working condition setting interface before the operation, and the control module 71 detects the pressure of the vertical cylinder of the chassis leg 5 through the oil pressure sensor 741, and transmits the pressure of the vertical cylinder to the control module 71. The control module 71 calculates the bare weight C' of the crane (the weight of the crane excluding the counterweight assembly 3) through the pressure of the vertical cylinder of the chassis leg 5, and stores the bare weight C' of the crane in the storage module 72.

[0030] Furthermore, when the control module 71 obtains the whole crane weight C, it retrieves the bare crane weight C' of the crane from the storage module 72, and the control module 71 determines the difference between the whole crane weight C and the bare crane weight C' as the weight B of the counterweight assembly 3 on the crane.

[0031] Furthermore, if the operator changes the device on the crane and the bare weight C' of the crane changes, the operator needs to re-set the bare weight C' through the human-machine interaction module 73. Specifically, the counterweight assembly 3 on the crane needs to be disassembled, and the operator clicks the human-machine interaction module 73 to enter the working condition setting interface before the operation. The control module 71 obtains the weight of the crane at this time through the second weight detection unit 75 provided on the chassis leg 5, and stores the weight of the crane in the storage module 72 as the bare weight C' of the crane.

[0032] like Figure 3 As shown, the present application also discloses a counterweight automatic setting system, including a control module 71, a human-computer interaction module 73 electrically connected to the control module 71, a storage module 72, a first weight detection unit 74, a second weight detection unit 75 and a third weight detection unit 76.

[0033] The first weight detection unit 74 is used to detect the actual weight A of the counterweight assembly 3 mounted on the turntable 1, the second weight detection unit 75 is arranged on the chassis leg 5, and is used to detect the weight B of the counterweight assembly 3 on the crane, and the third weight detection unit 76 is arranged on the counterweight bracket 6, and is used to detect the weight D of the counterweight assembly 3 carried by the counterweight bracket 6. The control module 71 is used to calculate the theoretical weight A' of the counterweight assembly 3 mounted on the turntable 1 according to the weight B of the counterweight assembly 3 on the crane detected by the second weight detection unit 75 and the weight D of the counterweight assembly 3 carried by the counterweight bracket 6 detected by the third weight detection unit 76, and to compare and analyze the actual weight A and the theoretical weight A' of the counterweight assembly 3 mounted on the turntable 1, and to set the crane working condition according to the analysis result. Preferably, the human-computer interaction module 73 is a touch screen, and the touch screen is used to display the parameter information and prompt information of the counterweight weight automatic setting system. At the same time, the operator can set the parameters in the counterweight weight automatic setting system through the touch screen.

[0034] In some embodiments, the counterweight base plate is connected to the turntable 1 through the counterweight oil cylinder 2, the first weight detection unit 74 includes an oil pressure sensor 741 provided on the counterweight oil cylinder 2 and a weighing sensor 742 provided on the turntable 1, and the counterweight assembly 3 includes a counterweight I 31 provided on the counterweight base plate and a counterweight II 32 detachably provided on the turntable 1. The third weight detection unit 76 is a weighing sensor 742.

[0035] Furthermore, there are two counterweights II 32, one of which is hung at the tail of the turntable 1, and the other is arranged inside the turntable 1. Both counterweights II 32 are provided with weighing sensors 742.

[0036] like Figure 4 , Figure 5 As shown, the present application also discloses a crane, including a chassis 4, a turntable 1 and a counterweight cylinder 2, the top of the counterweight cylinder 2 is detachably connected to the turntable 1, and the bottom of the counterweight cylinder 2 is connected to a counterweight base plate for carrying a counterweight assembly 3, chassis legs 5 are respectively provided at the four corners of the chassis 4, and a counterweight bracket 6 for supporting the counterweight base plate is provided on the top of the chassis 4. The crane also includes the above-mentioned counterweight automatic weight setting system.

[0037] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, which fall within the scope of the present application to be protected. The scope of protection claimed in the present application is defined by the attached claims and their equivalents.

Claims

1. A method for automatically setting the weight of a counterweight, characterized in that: include: The actual weight A of the counterweight assembly mounted on the turntable is obtained by a first weight detection unit; The weight B of the counterweight assembly on the crane is obtained through the second weight detection unit, and the weight D of the counterweight assembly carried by the counterweight bracket is obtained through the third weight detection unit, thereby obtaining the theoretical weight A' of the counterweight assembly hung on the turntable; The actual weight A and theoretical weight A' of the counterweight assembly mounted on the turntable are compared and analyzed. If the relative error between the two is within the tolerance, the crane operation condition is set according to the actual weight A of the counterweight assembly mounted on the turntable. If the relative error between the two is outside the tolerance, the operator is reminded to check and adjust the actual weight A of the counterweight assembly mounted on the turntable.

2. The method for automatically setting the weight of a counterweight according to claim 1, characterized in that: The step of obtaining the weight B of the counterweight assembly on the crane by the second weight detection unit comprises: The whole crane weight C is obtained by a second weight detection unit arranged on the chassis leg, and the whole crane weight C is compared with the bare crane weight C' (crane weight excluding the counterweight assembly) stored in the storage module to obtain the weight B of the counterweight assembly on the crane.

3. The method for automatically setting the weight of a counterweight according to claim 1, characterized in that: The step of obtaining the weight B of the counterweight assembly on the crane by the second weight detection unit further comprises: If the bare weight C' of the crane changes, the counterweight assembly on the crane is removed, the crane weight at this time is obtained by the second weight detection unit arranged on the chassis leg, and the crane weight is stored in the storage module as the bare weight C' of the crane.

4. The method for automatically setting the weight of a counterweight according to claim 1, characterized in that: The actual weight A of the counterweight assembly mounted on the turntable and the theoretical weight A' are compared and analyzed using the following formula: δ=(A-A') / A, where δ is the relative error between the actual weight A and the theoretical weight A'.

5. The method for automatically setting the weight of a counterweight according to claim 1, characterized in that: The method further comprises: If the relative error between the actual weight A of the counterweight assembly mounted on the turntable and the theoretical weight A' is outside the tolerance, the operator can manually and forcibly adjust the actual weight A through the human-computer interaction module after confirming the actual weight A of the counterweight assembly mounted on the turntable.

6. A counterweight weight automatic setting system for implementing the counterweight weight automatic setting method according to any one of claims 1 to 5, characterized in that: It includes a control module, a storage module electrically connected to the control module, a human-computer interaction module, a first weight detection unit, a second weight detection unit and a third weight detection unit. The first weight detection unit is used to detect the actual weight A of the counterweight assembly hung on the turntable. The second weight detection unit is arranged on the chassis leg and is used to detect the weight B of the counterweight assembly on the crane. The third weight detection unit is arranged on the counterweight bracket and is used to detect the weight D of the counterweight assembly carried by the counterweight bracket.

7. The automatic setting system for the counterweight according to claim 6, characterized in that: The counterweight assembly includes a counterweight I arranged on a counterweight base plate and a detachable counterweight II arranged on a turntable. The counterweight base plate is connected to the turntable through a counterweight cylinder. The first weight detection unit includes an oil pressure sensor arranged on the counterweight cylinder and a weighing sensor arranged on the turntable.

8. The automatic counterweight setting system according to claim 6, characterized in that: The second weight detection unit is an oil pressure sensor arranged in a vertical oil cylinder of the chassis leg.

9. The automatic counterweight setting system according to claim 6, characterized in that: The second weight detection unit is a weighing sensor arranged at the bottom of the chassis legs.

10. A crane, comprising a chassis, a turntable and a counterweight cylinder, wherein the top of the counterweight cylinder is detachably connected to the turntable, and the bottom of the counterweight cylinder is connected to a counterweight base plate for carrying a counterweight assembly, chassis legs are respectively provided at the four corners of the chassis, and a counterweight bracket for supporting the counterweight base plate is provided on the top of the chassis, characterized in that: The crane also includes a counterweight automatic weight setting system as described in any one of claims 1-9.

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