Balancing weight combination recognition system and crane

Abstract

The invention discloses a clump weight combination recognition system which comprises a clump weight combination, a clump weight recognition circuit, a vehicle-mounted display screen and a moment limiter. The balancing weight combination comprises a bottom balancing weight and a top balancing weight; two limiting columns which are perpendicular to the upper surface and are integrally conductive are fixed to the bottom balancing weight, the top and the bottom of each limiting column are each provided with a magnetic connector used for being connected with electricity, a resistor is embedded in the bottom balancing weight, the two ends of the resistor are connected with the two limiting columns through wires respectively, and the balancing weight recognition circuit is arranged on the bottom balancing weight. A vehicle-mounted system is connected through a magnetic connector; the top balancing weight is provided with a top limiting hole which is matched with the limiting column and allows the limiting column to penetrate through. The balancing weight identification circuit calculates the weight of the balancing weight by measuring the total resistance value of the balancing weight combination and transmits the weight to the vehicle-mounted display screen and the moment limiter. According to the invention, the resistor with the resistance value corresponding to the weight of the balancing weight is pre-embedded in the balancing weight, and the system automatically detects the resistance value and accurately calculates the combined weight of the balancing weight.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of weight block identification, in particular to a weight block combination identification system and a crane. BACKGROUND

[0002] In order to balance the moment of force when the crane hoists heavy objects, a weight block is usually added at the end of the balance arm. Under the same working condition, the larger the hoisting weight, the more weight blocks are needed. Before hoisting, the operator needs to manually calculate the total weight of the weight blocks and input it into the moment limiting system. The moment limiter calculates the maximum lifting capacity according to the input weight of the weight blocks. This manual calculation and input operation process is tedious and there is a risk of miscalculation or misinput. When a new weight block combination is replaced, it is easy to forget to input the new weight block combination parameters into the moment limiting system, resulting in moment limiting failure and major overturning accidents.

[0003] Currently, there are mainly the following four ways to identify the weight blocks of a crane: (1) Image recognition: such as patent CN110956181A "crane weight block detection method, device and crane", which collects the image of the weight block, and divides one or more foreground target regions from the image, extracts the edge features of one or more foreground target regions, matches the edge features of each foreground target region in the extracted one or more foreground target regions with the edge features of the standard model library about the weight block, calculates the matching value, and determines that the corresponding foreground target region corresponds to the weight block if the matching value is greater than the threshold. This method is limited by light conditions, night work environment and blockage between weight blocks, and has no practical engineering application at present.

[0004] (2) Radio frequency identification: such as patent CN110950247B "crane weight block combination identification method, system and crane", which sends a weight information reading instruction to a radio frequency reader in response to a weight information reading instruction from a main controller; reads the information of the radio frequency carrier code body corresponding to each weight block on the crane through the radio frequency reader; transmits the information reading result from the radio frequency controller to the main controller through the radio frequency reader; and analyzes the information reading result through the main controller to calculate the current weight information. This method requires that the radio frequency signal receiver and the radio frequency tag be within the effective range and there be no obstruction in between, has a low recognition success rate, and the system is expensive.

[0005] (3) Detecting the thickness of the weight block to identify: such as patent CN202440254U "a weight detection device and a hoisting equipment", which calculates the thickness of the weight block combination through distance detection, and then calculates the weight of the weight block. This method has obvious limitations on the structure of the weight block, which must be placed below the weight cylinder and cannot identify the weight of the side weight block.

[0006] (4) Detection of counterweight oil cylinder pressure identification: as the patent CN102249152A "crane movable counterweight detection device and method" detects the large and small cavity pressure of the counterweight oil cylinder through a pressure sensor, calculates the combined weight of the counterweight block, and realizes the automatic selection of the lifting load working condition. The pressure stability of the oil in the counterweight oil cylinder and the inertia force and oil cylinder friction force during the lifting of the counterweight will also cause the pressure in the rod cavity to be greater than the actual counterweight, so that the calculated weight of the counterweight block is inaccurate. SUMMARY

[0007] The purpose of the application is to provide a counterweight block combination identification system, which automatically detects the resistance value and accurately calculates the combined weight of the counterweight block by pre-embedding a resistance corresponding to the weight of the counterweight block in the counterweight block. The second purpose is to provide a crane comprising the above-mentioned counterweight block combination identification system.

[0008] Technical scheme: The counterweight block combination identification system provided by the application comprises a counterweight block combination, a counterweight block identification circuit, and a vehicle-mounted display screen and a torque limiter connected to the counterweight block identification circuit. The counterweight block combination comprises a bottom counterweight block and a top counterweight block. Two integral conductive limit columns perpendicular to the upper surface are fixed on the bottom counterweight block, the limit columns are arranged in a penetrating manner, and a magnetic attraction connector for connecting electricity is arranged at the top and bottom of each limit column. A resistance corresponding to the weight of the bottom counterweight block is pre-embedded in the bottom counterweight block, and the resistance is connected to the two limit columns through wires at both ends. The counterweight block identification circuit is arranged on the bottom counterweight block and connected to the vehicle-mounted system through the magnetic attraction connector to realize circuit power supply and information interaction. The top counterweight block is provided with a top limiting hole corresponding to the limit column and passing through the limit column. A resistance corresponding to the weight of the top counterweight block and a metal elastic top pin are pre-embedded in the top counterweight block. The resistance is connected to the metal elastic top pin through wires at both ends, and the metal elastic top pin is electrically connected to the two limit columns through the metal elastic top pin. The metal elastic top pin is an arc-shaped elastic structure and extends a certain length in the top limiting hole to contact the limit column. The counterweight block identification circuit calculates the weight of the counterweight block by measuring the total resistance value of the counterweight block combination and transmits the result to the vehicle-mounted display screen and the torque limiter.

[0009] Further, the counterweight block identification circuit comprises a power module, a counterweight block weight acquisition module, an MCU control module, a data transmission module, and an audible and visual alarm module. The power module converts the voltage input by the vehicle-mounted system to supply power to the circuit. The counterweight block weight acquisition module measures the total resistance value of the counterweight block combination. The MCU control module calculates the weight of the counterweight by the collected resistance value and sends the combined weight of the counterweight to the torque limiter through the data transmission module; the torque limiter compares the combined weight of the counterweight with the combined weight of the counterweight required by the lifting condition, and if there is a difference, sends a signal that the combined weight of the counterweight does not meet the requirements through the data transmission module, and controls the sound and light alarm module to issue a corresponding alarm prompt.

[0010] Further, one or more intermediate counterweights are arranged between the bottom counterweight and the top counterweight, and a resistance corresponding to the weight of the intermediate counterweight is pre-buried in the intermediate counterweight, and the resistance is electrically connected to the limiting column at both ends.

[0011] Further, a middle limiting hole is arranged on the intermediate counterweight and adapted to the limiting column and for the limiting column to pass through, and a metal elastic pin with the same structure as the top counterweight is pre-buried in the intermediate counterweight, and the resistance in the intermediate counterweight is connected to the metal elastic pin at both ends through a wire, and the metal elastic pin is electrically connected to the two limiting columns.

[0012] Further, a side counterweight is arranged on the side edge of the top counterweight, and a resistance corresponding to the weight of the side counterweight is pre-buried in the top counterweight, and the resistance is connected in series through a magnetic switch to form a branch, and the branch is connected in parallel with the resistance corresponding to the weight of the top counterweight, and a magnet is arranged at a position corresponding to the magnetic switch of the side counterweight, and the magnet (10) attracts the magnetic switch when the side counterweight is installed.

[0013] Further, a hanging groove for hanging the side counterweight is arranged on the left and right sides of the top counterweight.

[0014] Further, an installation groove for installing a counterweight recognition circuit is arranged at the front end of the bottom counterweight.

[0015] Correspondingly, a crane comprising the counterweight combination recognition system is also disclosed.

[0016] Further, a counterweight installation limiting device and a counterweight oil cylinder are arranged on the vehicle frame, and the counterweight installation limiting device and the counterweight oil cylinder are respectively arranged at positions corresponding to the bottom and top of the limiting column and connected to a vehicle-mounted magnetic connector connected to the magnetic connector for connecting the vehicle-mounted system.

[0017] Beneficial effects: Compared with the prior art, the significant advantages of this invention are: it can automatically, accurately, and quickly identify the combined weight of the crane counterweight blocks and send the combined weight of the counterweight blocks to the torque limiter. When the torque on the center of rotation under the lifting condition is within the safe allowable range, the lifting operation is allowed. When it is outside the safe allowable range, the action command can be refused. In addition, the counterweight block identification circuit can issue an audible and visual alarm prompt. This can avoid safety accidents caused by operator misoperation or accidental start-up, and plays a multiple protective role, improving the safety of lifting. Attached Figure Description

[0018] Figure 1 This is an assembly drawing of the crane of the present invention; Figure 2 This is a top view of the counterweight assembly of the present invention; Figure 3 This is a cross-sectional view of the counterweight assembly of the present invention; Figure 4 This is a diagram of the internal structure of the top counterweight block of the present invention; Figure 5 This is a diagram showing the internal structure of the intermediate counterweight block of the present invention; Figure 6 This is a diagram showing the internal structure of the side counterweight block of the present invention; Figure 7 This is a framework diagram of the counterweight identification system of the present invention; Figure 8 This is a flowchart of the counterweight identification process of the present invention. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 The crane shown includes a counterweight combination identification system, a frame 12, a counterweight mounting limit device 13 and a counterweight cylinder 14 disposed on the frame 12.

[0021] The aforementioned counterweight combination recognition system includes: a counterweight combination, a counterweight recognition circuit, and a vehicle-mounted display screen and torque limiter connected to the counterweight recognition circuit.

[0022] like Figure 2 and 3 As shown, the counterweight assembly includes a bottom counterweight 1 and a top counterweight 2.

[0023] Two limit columns 3 which are integral and conductive vertically to the upper surface are fixed on the bottom counterweight 1. The limit columns 3 are made of conductive material and have conductive surface. The limit columns 3 are arranged through the bottom counterweight 1. The top and bottom of each limit column 3 is provided with a magnetic connector 4 for connecting electricity. The counterweight installation limiting device 13 and the counterweight cylinder 14 are arranged at the positions corresponding to the bottom and top of the limit column 3 respectively. The vehicle-mounted magnetic connector 15 is connected with the magnetic connector 4 for connecting the vehicle-mounted system.

[0024] The resistance R0 corresponding to the weight of the bottom counterweight 1 is embedded in the bottom counterweight 1. The resistance R0 is connected with the two limit columns 3 through wires. The bottom counterweight 1 is provided with an installation slot for installing the counterweight identification circuit. The counterweight identification circuit is arranged on the bottom counterweight 1 and connected with the vehicle-mounted system through the magnetic connector 4 to realize circuit power supply and information interaction.

[0025] The top counterweight 2 is provided with two top limiting holes 5 corresponding to the limit columns 3. The top counterweight 2 is embedded with the resistance R1 corresponding to the weight of the top counterweight 2 and four metal elastic pins 6. The resistance R1 is connected with the metal elastic pins 6 through wires. The metal elastic pins 6 are electrically connected with the two limit columns 3 through the metal elastic pins 6. The metal elastic pins 6 are arc-shaped elastic structure and extend a certain length in the top limiting hole 5 to contact with the limit columns 3.

[0026] As shown in Figure 3 and 5 , if counterweight is needed, one or more intermediate counterweights 7 are arranged between the bottom counterweight 1 and the top counterweight 2. The intermediate counterweight 7 is embedded with the resistance Rx corresponding to the weight of the intermediate counterweight 7. Two intermediate counterweights are used in the embodiment. The corresponding resistances are Rx1 and Rx2. The resistance Rx is electrically connected with the limit columns 3.

[0027] The intermediate counterweight 7 is provided with a middle limiting hole 8 corresponding to the limit column 3. The intermediate counterweight 7 is embedded with the metal elastic pin 6 which has the same structure as the top counterweight 2. The resistance Rx in the intermediate counterweight 7 is connected with the metal elastic pin 6 through wires. The metal elastic pin 6 is electrically connected with the two limit columns 3.

[0028] As shown in Figure 3 and 6As shown, if counterweight is needed, side counterweight 16 is arranged at the side of top counterweight 2, and suspension grooves 11 for suspending side counterweight 16 are arranged at the left and right sides of top counterweight 2, and a resistance corresponding to the weight of side counterweight 16 is pre-embedded in the inside of top counterweight 2, and the left and right sides of the embodiment are both provided with side counterweight, and the corresponding resistances are R2 and R3, and the resistances are connected in series through magnetic switch 9 to form a branch, and the branch is connected in parallel with the resistance corresponding to the weight of top counterweight 2, and the position of side counterweight 16 corresponding to magnetic switch 9 is provided with magnet 10, and when side counterweight 16 is installed, magnet 10 will attract magnetic switch 9.

[0029] As shown in the figure, Figure 7 The counterweight recognition circuit includes a power module, a counterweight weight acquisition module, an MCU control module, a data transmission module, and an audible and light alarm module. The power module converts the voltage input by the vehicle into 5V and 3.3V to power other circuit modules. The counterweight weight acquisition module measures the total resistance value of the counterweight combination. The MCU control module calculates the weight of the counterweight through the acquired resistance value and sends the combined weight of the counterweight to the torque limiter through the data transmission module. The counterweight weight acquisition module is a series voltage divider connected in parallel with the known fixed resistance (reference resistance) and the resistance of all measured counterweights. The MCU's voltage acquisition pin measures the voltage value at the voltage dividing point to calculate the total weight of the counterweight.

[0030] The torque limiter receives the combined weight of the counterweight and compares it with the required combined weight of the counterweight for the lifting condition. If there is a difference, the torque limiter sends a signal that the combined weight of the counterweight does not meet the requirements through the data transmission module. The counterweight recognition circuit controls the audible and light alarm circuit to issue an appropriate alarm until the combined weight of the counterweight meets the requirements of the lifting condition. The MCU control module then disables the audible and light alarm.

[0031] Before lifting, the operator selects the lifting condition through the vehicle display screen, and the torque limiter calculates the required combined weight of the counterweight based on the crane performance table. The counterweight cylinders 14 on the crane carry different weights and quantities of counterweights. The bottom counterweight 1 and the top counterweight 2 are the necessary counterweights, and the middle counterweight 7 is selected according to the need for different weights and quantities. The middle counterweight is limited between the bottom counterweight 1 and the top counterweight 2. The side counterweight 16 can also be hung on the left and right sides of the top counterweight 2 according to the need.

[0032] As shown in the figure, Figure 8 The identification steps of the counterweight combination recognition system in this crane are as follows: (1) The operator first selects the corresponding lifting condition through the vehicle display screen according to the weight of the lifted object and the lifting site, and the torque limiter calculates the total weight M0 of the counterweight required to be mounted according to the selected lifting condition.

[0033] (2) The operator then places the bottom counterweight 1 above the counterweight installation limiting device 13 of the crane frame 12, the two vehicle-mounted magnetic connectors 15 above the counterweight installation limiting device 13 are automatically connected with the magnetic connectors 4 below the limiting column 3 of the bottom counterweight 1, the counterweight recognition circuit installed in the front installation slot of the bottom counterweight 1 is powered on, and a signal connection is established with the torque limiter.

[0034] (3) The torque limiter sends the total weight M0 of the counterweight to be mounted to the counterweight recognition circuit, the counterweight recognition circuit receives M0 and compares the sum MX1 of the weights of the bottom counterweight 1 and the top counterweight 2 stored in the circuit in advance with M0.

[0035] (4) If the total weight MX1 of the bottom counterweight 1 and the top counterweight 2 is greater than M0, the counterweight recognition circuit does not issue an audible and visual alarm at this time, and the operator only needs to install the top counterweight 2 above the bottom counterweight 1. The two metal elastic pins in the top limiting hole 5 of the top counterweight 2 will automatically top the limiting column 3, and the two magnetic switches 9 buried in the top counterweight 2 will be in an open state. At this time, only the resistor R1 in the top counterweight 2 is connected to the counterweight recognition circuit through the limiting column 3, the counterweight recognition circuit will collect the resistance value of the counterweight combination and calculate the combined weight MX1 of the top counterweight 2 and the bottom counterweight 1, and send MX1 to the torque limiter through the data transmission module. (5) After receiving the combined weight MX1 of the top counterweight 2 and the bottom counterweight 1, the torque limiter confirms again that the weight M0 of the counterweight required for the lifting condition is met, and displays the combined weight of the counterweight on the vehicle-mounted display screen, and sends a command to the counterweight recognition circuit to mount the counterweight combination to the crane counterweight cylinder. The operator mounts the top counterweight 2 and the bottom counterweight 1 combination to the crane counterweight cylinder 14 according to the prompt, the magnetic connectors 4 below the limiting column 3 are disconnected with the two vehicle-mounted magnetic connectors 15 on the counterweight installation limiting device 13, the magnetic connectors 4 above the limiting column 3 are connected with the two vehicle-mounted magnetic connectors 15 below the counterweight cylinder 14, the counterweight recognition circuit is powered on again and sends the combined weight of the counterweight and the mounting success command to the torque limiter through the data transmission module. After the torque limiter confirms the combined weight MX1 of the counterweight again, it prompts on the vehicle-mounted display screen that the combined weight of the counterweight meets the lifting condition and the lifting operation can be performed.

[0036] (6) If the total weight MX1 of the bottom counterweight 1 and the top counterweight 2 is less than or equal to the combined weight M0 of the counterweight required, the counterweight recognition circuit controls the audible and visual alarm module to issue an audible and visual alarm to prompt the operator that the intermediate counterweight needs to be installed. At the same time, the counterweight recognition circuit sends the combined weight MX1 of the counterweight to the torque limiter through the data transmission module, and the torque limiter prompts on the vehicle-mounted display screen that the weight of the counterweight is insufficient and the intermediate counterweight needs to be installed.

[0037] (7) The operator installs the middle counterweight block above the bottom counterweight block 1 according to the audible and light alarm prompt. The two metal elastic pins symmetrically distributed in the middle limiting hole 8 on the middle counterweight block 7 will automatically top the limiting column 3. The resistance Rx buried in the middle counterweight block automatically accesses to the counterweight block identification circuit. The counterweight block identification circuit collects the resistance value of the counterweight block combination at this time to calculate the counterweight block combination weight MX2, and compares it with the required counterweight block M0. If MX2 is less than the required counterweight block weight M0, the control audible and light alarm module continues to alarm to prompt the operator to continue to install the middle counterweight block. At the same time, the counterweight block identification circuit sends the calculated counterweight block combination weight MX2 to the torque limiter in real time through the data transmission module. After receiving the counterweight block combination weight MX2, the torque limiter prompts on the vehicle display screen that the counterweight block weight is insufficient and needs to continue to install the middle counterweight block.

[0038] (8) If the audible and light alarm module does not issue an alarm prompt after installing the middle counterweight block, only the top counterweight block needs to be installed. The combined counterweight block is hung below the crane counterweight oil cylinder. The magnetic connector 4 below the limiting column 3 is disconnected with the vehicle magnetic connector 15 on the counterweight block installation limiting device 13. The magnetic connector 4 above the limiting column 3 is connected with the two vehicle magnetic connectors 15 below the counterweight oil cylinder. The counterweight block identification circuit is powered again and sends the counterweight block combination weight and the hanging success instruction to the torque limiter through the data transmission module. After confirming the counterweight block combination weight MX2 again, the torque limiter prompts on the vehicle display screen that the counterweight block combination weight meets the lifting working condition and can proceed with the lifting operation.

[0039] (9) If the audible and light alarm module of the counterweight block identification circuit still issues an audible and light alarm after installing the middle counterweight block, repeat steps 7 and 8.

[0040] (10) If the audible and light alarm module still issues an audible and light alarm after all the middle counterweight blocks are installed, after installing the top counterweight block 2, the side counterweight block 16 is hung on the side of the top counterweight block 2. The magnet 10 will attract the magnetic switch 9 buried in the top counterweight block 2, and the resistance R2 / R3 buried in the top counterweight block 2 will form a branch. The branch and R1 are in parallel relationship, and the two ends are respectively contacted with the limiting column 3 through the metal elastic pins of the top counterweight block 2. At this time, the counterweight block identification circuit can collect the combined resistance value of all the counterweight blocks and calculate the counterweight block combination weight MX3. Through the data transmission module, the counterweight block combination weight MX3 is sent to the torque limiter, (11) After the torque limiter receives the data MX3, it again confirms whether the combined weight MX3 of all the counterweights meets the lifting requirements. If it meets the lifting requirements, the vehicle-mounted display screen prompts that the combined weight MX3 of the counterweights meets the lifting requirements and the lifting operation can be performed, and at the same time, the torque limiter sends a command to the counterweight identification circuit to connect the counterweight combination to the crane counterweight oil cylinder 14. After the MCU control module of the counterweight identification circuit receives the command, it closes the audible and visual alarm. If MX3 does not meet the lifting requirements, the vehicle-mounted display screen gives a prompt message, and after confirmation, the system automatically selects the lifting working condition according to MX3.

Claims

1. A counterweight combination identification system, characterized in that, include: The counterweight assembly, the counterweight identification circuit, and the vehicle-mounted display screen and torque limiter connected to the signal of the counterweight identification circuit; The counterweight assembly includes a bottom counterweight (1) and a top counterweight (2). Two integral conductive limiting posts (3) perpendicular to the upper surface are fixed on the bottom counterweight (1). The limiting posts (3) are installed through each other. Each limiting post (3) has a magnetic connector (4) for connecting to electricity at the top and bottom. A resistor corresponding to the weight of the bottom counterweight (1) is embedded inside the bottom counterweight (1). The two ends of the resistor are connected to the two limiting posts (3) respectively through wires. The counterweight identification circuit is set on the bottom counterweight (1) and connected to the vehicle system through the magnetic connector (4) to realize circuit power supply and information interaction. The top counterweight (2) is provided with a top limiting hole (5) that is adapted to the limiting post (3) and allows it to pass through. The top counterweight (2) is pre-embedded with a resistor corresponding to the weight of the top counterweight (2) and a metal elastic pin (6). The two ends of the resistor are connected to the metal elastic pin (6) through wires. The metal elastic pin (6) is electrically connected to the two limiting posts (3) respectively. The metal elastic pin (6) is an arc-shaped elastic structure that extends a certain length inside the top limiting hole (5) and contacts the limiting post (3). The counterweight identification circuit calculates the weight of the counterweight by measuring the total resistance value of the counterweight assembly and transmits the data to the vehicle display screen and torque limiter.

2. The counterweight combination identification system according to claim 1, characterized in that: The counterweight identification circuit includes a power supply module, a counterweight weight acquisition module, an MCU control module, a data transmission module, and an audible and visual alarm module. The power module converts the voltage input to the vehicle system to power the circuit. The counterweight weight acquisition module measures the total resistance of the counterweight assembly. The MCU control module calculates the weight of the counterweight by collecting the resistance value and sends the combined weight of the counterweight to the torque limiter through the data transmission module. The torque limiter receives the combined weight of the counterweight and compares it with the combined weight of the counterweight required for the hoisting condition. If there is a difference, it sends a signal that the combined weight of the counterweight does not meet the requirements through the data transmission module, and controls the audible and visual alarm module to issue a corresponding alarm prompt.

3. The counterweight combination identification system according to claim 1, characterized in that: One or more intermediate counterweights (7) are provided between the bottom counterweight (1) and the top counterweight (2). The intermediate counterweights (7) are pre-embedded with resistors corresponding to the weight of the intermediate counterweights (7), and the two ends of the resistors are electrically connected to the limiting post (3).

4. The counterweight combination identification system according to claim 3, characterized in that: The intermediate counterweight (7) is provided with a central limiting hole (8) that is adapted to the limiting post (3) and allows it to pass through. The intermediate counterweight (7) is pre-embedded with a metal elastic pin (6) that has the same structure as the top counterweight (2). The two ends of the resistor in the intermediate counterweight (7) are respectively connected to the metal elastic pin (6) through wires, and are electrically connected to the two limiting posts (3) through the metal elastic pin (6).

5. The counterweight combination identification system according to claim 1, characterized in that: The top counterweight (2) is provided with a side counterweight (16) on its side. The top counterweight (2) has a resistor pre-embedded inside, which corresponds to the weight of the side counterweight (16). The resistor is connected in series with a magnetic switch (9) to form a branch. The branch is connected in parallel with the resistor corresponding to the weight of the top counterweight (2). A magnet (10) is provided on the side counterweight (16) at the position corresponding to the magnetic switch (9). When the side counterweight (16) is installed, the magnet (10) will attract the magnetic switch (9).

6. The counterweight combination identification system according to claim 5, characterized in that: The top counterweight (2) is provided with suspension grooves (11) on the left and right sides for suspending the side counterweights (16).

7. The counterweight combination identification system according to claim 5, characterized in that: The bottom counterweight (1) has a mounting slot at its front end for installing a counterweight identification circuit.

8. A crane, characterized in that, The system includes the counterweight combination identification system as described in claim 1.

9. The crane according to claim 1, characterized in that: Includes a frame (12) and a counterweight mounting limit device (13) and a counterweight cylinder (14) mounted on the frame (12). The counterweight mounting limit device (13) and the counterweight cylinder (14) are respectively provided with vehicle magnetic connectors (15) for connecting to the magnetic connector (4) at the bottom and top positions of the limit post (3) to connect to the vehicle system.

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