Resistance type crane counterweight detection system and method and crane

Abstract

The invention relates to the technical field of cranes, in particular to a resistance type crane counterweight detection system and method and a crane. According to the resistance type crane counterweight detection system disclosed by the invention, in-place detection of counterweight lifting is carried out through a current signal generated when the counterweight circuit on the counterweight block is communicated with the detection circuit on the rotary table to form a detection loop, so that misjudgment of counterweight lifting in-place caused by visual inspection or pressure switch detection can be effectively avoided; and the accuracy and the safety of the lifting performance are improved. The resistance value of the counterweight resistor in the detection loop is determined according to the current interval to which the current value of the detection loop belongs, and the actual weight of the hanging counterweight is further determined according to the resistance value. After the controller determines the actual weight of the balance weight, a weight signal of the actual weight of the balance weight is sent to the working condition matching module, so that correct matching of the working conditions of the crane is ensured, and correctness and safety of working condition selection are ensured.

Description

Technical Field

[0001] This invention relates to the field of crane technology, specifically to a resistance-type crane counterweight detection system, method, and crane. Background Technology

[0002] Cranes are widely used in various locations such as ports, docks, railway stations, warehouses, and construction sites. The counterweight is a crucial component of a crane, playing a vital role in ensuring its lifting performance.

[0003] Before lifting a load, the crane needs to attach a counterweight to the back of the turntable, and simultaneously plan and set the working conditions based on the weight. Currently, the weight of the counterweight is usually calculated manually, which is prone to errors, leading to discrepancies between the actual counterweight weight and the required working conditions, posing a risk of loss of control. Furthermore, the current method of detecting the counterweight cylinder's lifting position relies on pressure switch signals or pressure value detection. Due to the high lifting pressure of the cylinder, pressure switches are prone to failure; additionally, pressure value detection can experience pressure loss over time, resulting in inaccurate detection.

[0004] Therefore, it is necessary to develop a crane counterweight detection system that can accurately determine whether the counterweight has been lifted to the correct position and accurately detect the actual weight of the counterweight. Summary of the Invention

[0005] The purpose of this invention is to provide a resistance-type crane counterweight detection system, method, and crane. The system can accurately determine whether the lifting mechanism has been lifted into place by the current signal of the detection circuit. It can also determine the resistance value of the counterweight resistor in the detection circuit by the current signal. Based on the resistance value of the counterweight resistor in the detection circuit, the actual weight of the counterweight attached to the turntable can be accurately determined to ensure the correct matching of the crane's working conditions.

[0006] In a first aspect, the present invention provides a resistance-type crane counterweight detection system, comprising: Turntable connectors are used to install on the turntable of a crane; The counterweight block is equipped with a counterweight circuit, and the counterweight circuit is equipped with a counterweight resistor corresponding to the weight of the counterweight block. The counterweight block is also provided with a counterweight connector. A lifting mechanism is used to lift the counterweight block; when the lifting mechanism lifts the counterweight block to the counterweight connector on the counterweight block and connects it to the turntable connector on the turntable, the counterweight circuit is connected to the detection circuit pre-configured on the turntable to form a detection loop. The controller is communicatively connected to the lifting mechanism and the detection circuit. The controller is used to send a position signal to the lifting mechanism when it receives a current signal from the detection circuit. The controller is also used to determine the resistance value of the counterweight resistor in the detection circuit based on the current signal of the detection circuit, and to determine the actual weight of the counterweight hanging on the turntable based on the resistance value of the counterweight resistor in the detection circuit.

[0007] Optionally, the counterweights are provided in multiple units, and each counterweight circuit is equipped with a circuit switch; the counterweight connectors between adjacent counterweights are interconnected, and by controlling the opening and closing state of the circuit switches in each counterweight circuit, the counterweight resistors of multiple counterweights can be connected in series to the detection circuit.

[0008] Optionally, the counterweight includes a main counterweight and a side counterweight, and the main counterweight and the side counterweight are matched with the counterweight weight and the counterweight resistance according to the first rule and the second rule, respectively.

[0009] Optionally, the controller is also communicatively connected to a working condition matching module, which is used to send the weight signal of the actual weight of the counterweight to the working condition matching module for crane working condition matching.

[0010] Optionally, it also includes: The display is communicatively connected to the controller. The controller sends a position signal to the lifting mechanism and a lifting position display signal to the display at the same time. The controller is also used to send a weight display signal of the actual weight of the counterweight to the display.

[0011] Secondly, the present invention provides a method for detecting the counterweight of a resistance crane, which is based on the aforementioned resistance crane counterweight detection system, the method comprising: In response to receiving a current signal from the detection circuit, the current value of the detection circuit is determined based on the current signal. The resistance value of the counterweight resistor in the detection circuit is determined based on the current value of the detection circuit, and the actual weight of the counterweight hung on the turntable is determined based on the resistance value. The actual weight signal of the counterweight is sent to the working condition matching module to perform crane working condition matching.

[0012] Optionally, determining the resistance value of the counterweight resistor within the detection circuit based on the current value of the detection circuit includes: Based on a pre-built table relating current ranges and resistance values, the resistance value of the counterweight resistor in the detection circuit is determined according to the current range to which the current value of the detection circuit belongs.

[0013] Optionally, when the counterweight includes a main counterweight and a side counterweight, the actual weight combination of the main counterweight and the side counterweight attached to the turntable is determined based on the resistance value of the counterweight resistor.

[0014] Optionally, if no circuit signal is received from the detection loop, a machine-wide movement limit signal is sent to the crane's overall controller; If the current signal received from the detection circuit is lost, the weight signal of the preset counterweight fixed weight will be sent to the working condition matching module to perform crane working condition matching.

[0015] Thirdly, the present invention provides a crane that includes the aforementioned resistance-type crane counterweight detection system.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The resistive crane counterweight detection system of this invention uses the current signal from the detection loop formed when the counterweight circuit on the counterweight block is connected to the detection circuit on the turntable to detect the counterweight's lifting position. This effectively avoids misjudgments of counterweight lifting position caused by visual inspection or pressure switch detection, thus improving the accuracy and safety of lifting performance. Furthermore, the controller of this invention determines the resistance value of the counterweight resistor within the detection loop based on the current range of the detection loop's current value. Based on the resistance value, it further determines the actual weight of the attached counterweight. After determining the actual weight, the controller sends the weight signal to the working condition matching module for crane working condition matching, ensuring the correctness and safety of the working condition selection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a resistance-type crane counterweight detection system provided in an embodiment of the present invention; Figure 2 The present invention provides a detection flowchart for a resistance crane counterweight detection system.

[0018] Numbering on the map: 1. Turntable; 2. Counterweight; 3. Counterweight resistor; 4. Connector; 5. Configuration circuit; 6. Circuit switch; 7. Switch control structure. Detailed Implementation

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0021] To make the purpose, technical solution, and advantages of this invention patent clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] Combination Figure 1This embodiment provides a resistance-type crane counterweight detection system, which includes a counterweight block 2, connectors 4 (including turntable connectors mounted on a turntable 1 and counterweight connectors mounted on the counterweight block 2), a lifting mechanism, and a controller. The counterweight block 2 is equipped with a counterweight circuit 5, which contains a counterweight resistor 3 corresponding to the weight of the counterweight block 2. The counterweight block also has counterweight connectors. The lifting mechanism is used to lift the counterweight block 2. The lifting mechanism can be a counterweight cylinder or other power system with the same function. When the lifting mechanism lifts the counterweight block 2 until the counterweight connector on the counterweight block 2 connects to the turntable connector on the turntable 1, the counterweight circuit 5 connects with a pre-configured detection circuit on the turntable 1 (which can be an existing upper-vehicle electrical circuit on the turntable or an additionally arranged circuit) to form a detection circuit. The controller is communicatively connected to the lifting mechanism and the detection circuit. The controller is used to send a position signal to the lifting mechanism when it receives a current signal from the detection circuit. The controller is also used to determine the resistance value of the counterweight resistor in the detection circuit based on the current value of the detection circuit and to determine the actual weight of the counterweight attached to the turntable 1 based on the resistance value of the counterweight resistor in the detection circuit.

[0023] The resistance-type crane counterweight detection system in this embodiment uses the current signal received by the controller when the counterweight circuit 5 is connected to the detection circuit to form a detection loop to detect whether the counterweight has been lifted into position. If the controller does not detect a current signal, it will send a machine-wide movement limit signal to the crane's overall controller, which will restrict the crane's movement in a dangerous direction. This embodiment, by using current signal detection, can effectively avoid misjudgments of counterweight lifting into position caused by visual inspection or pressure switch detection, thus improving the accuracy and safety of lifting operations.

[0024] In this embodiment, the resistance-type crane counterweight detection system adds a counterweight resistor 3 to the counterweight block 2. The resistance value of the counterweight resistor 3 is set accordingly for different tonnages and different mounting methods (distinguished as main counterweight and side counterweight). The counterweight tonnage and mounting method can be determined based on the measured resistance value. In this embodiment, all counterweight resistors 3 are connected in series to a conductive detection circuit. The current signal of the detection circuit is fed back to the controller. The controller determines the resistance value of the counterweight resistor 3 within the detection circuit based on the current range to which the current value of the detection circuit belongs (obtained by pre-testing and calibrating the voltage value and other resistances in the circuit; because voltage fluctuates, the corresponding current value is a range). The correlation relationship of "resistance value -- current value -- actual counterweight weight" is pre-calibrated, and the actual weight of the mounted counterweight can be obtained through a correlation table. When the counterweight block 2 includes both main and side counterweights, the correlation relationship is "resistance value --..." The "Current Value - Actual Weight Combination of Counterweights" function directly provides the actual weight and combination of the attached counterweights, including the actual weights of the main counterweight and the side counterweights. The main and side counterweights are matched against their corresponding resistances using a first and a second rule, respectively, to differentiate them. For example, a 5t main counterweight might have resistance R1 and a 5t side counterweight R2; a 10t main counterweight might have resistance R3 and a 10t side counterweight R4. If the detected resistance value is R1 + R2, then the actual weight combination is a 5t main counterweight and a 5t side counterweight. After determining the actual weight, the controller sends the weight signal to the working condition matching module to match the crane's working conditions, ensuring the correctness and safety of the selected working conditions. Furthermore, the current signal received by the controller can be used to detect faults in the counterweight resistor 3. If the measured current value cannot be matched with the actual counterweight weight or actual counterweight weight combination in the "resistance value-current value-actual counterweight weight combination" relationship, it indicates that the counterweight resistor 3 may be faulty and requires manual intervention to ensure the accuracy of the counterweight detection. In this embodiment, the current value of the detection circuit read by the controller is used to match the actual counterweight weight. The matching result has high accuracy, which allows for the correct selection of crane operating conditions in the subsequent process, effectively avoiding the risk of rollover caused by a mismatch between the actual counterweight weight and the selected operating conditions.

[0025] In this embodiment, each counterweight 2 (main counterweight or side counterweight) is equipped with a circuit switch 6 in its counterweight circuit 5. The counterweight connectors of multiple counterweights 2 are interconnected. By controlling the opening and closing state of the circuit switches 6 in each counterweight circuit 5, the counterweight resistors 3 of multiple counterweights 2 can be connected in series to the detection circuit. Specifically, the circuit switch 6 is normally closed. When multiple counterweights 2 are attached to the turntable 1, the switch control structure 7 of the next-level counterweight 2, after assembly, keeps the circuit switch 6 open, ensuring that the counterweight resistors 3 ultimately connected to the detection circuit remain in series for matching calculations of the "resistance value - current value - actual counterweight weight" correlation. The controller in this embodiment is communicatively connected to a display. The controller sends a position signal to the lifting mechanism and simultaneously sends a lifting-in-position display signal to the display so that the operator can determine whether the counterweight 2 has been lifted into position. The controller is also used to send a weight display signal of the actual counterweight weight to the display so that the operator can further select the operating condition.

[0026] Combination Figure 2The working process of the counterweight detection system for the resistance crane is explained as follows: When the lifting mechanism lifts the counterweight (pre-assembled) to the preset position (usually the highest point that the counterweight block can reach), the counterweight connector on the counterweight block 2 is connected to the turntable connector on the turntable 1. The counterweight circuit 5 on the counterweight block 2 is connected to the detection circuit on the turntable 1 to form a detection loop. The controller receives the current signal fed back from the detection loop. At this time, the controller determines that the lifting mechanism has reached the preset position. The controller transmits the position signal of the lifting mechanism to the display, and the display shows the lifting mechanism's position limit status. The controller determines the current value of the detection circuit based on the current signal fed back from the detection circuit, determines the resistance value of the counterweight resistor 3 based on the current range to which the current value belongs, and further determines the actual weight of the counterweight attached to the turntable 1 based on the resistance value. The controller transmits the weight signal of the actual counterweight to the display, which sets and displays the actual weight of the attached counterweight at this time. The controller also sends the weight signal of the actual counterweight to the torque limiter. The operator selects the working condition based on the actual weight of the attached counterweight, matching the working condition according to the vehicle's radius and boom length, thus improving the intelligence of the lifting working condition. In this embodiment, to avoid misoperation, the operator is not allowed to modify the actual weight of the counterweight on the display. If the current signal of the detection circuit is lost, the weight signal of the preset fixed weight of the counterweight is sent to the working condition matching module to match the crane working condition, thereby restricting the selection of working conditions. In addition, to avoid line faults or damage to the counterweight resistor, an emergency mode function is added. After the controller reports a loss of current signal, troubleshooting is not possible in a short time. To avoid losses for customers, an emergency mode function has been added. By contacting the factory to parse the random code, the counterweight lock can be unlocked and manually set, allowing normal lifting capacity. The emergency mode function is set to not remember the fault code after power failure to prevent safety risks from prolonged use by customers.

[0027] Another specific embodiment provides a crane that includes the aforementioned resistance crane counterweight detection system.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A resistance-type crane counterweight detection system, characterized in that, include: Turntable connectors are used to install on the turntable of a crane; The counterweight block is equipped with a counterweight circuit, and the counterweight circuit is equipped with a counterweight resistor corresponding to the weight of the counterweight block. The counterweight block is also provided with a counterweight connector. A lifting mechanism is used to lift the counterweight block; when the lifting mechanism lifts the counterweight block to the counterweight connector on the counterweight block and connects it to the turntable connector on the turntable, the counterweight circuit is connected to the detection circuit pre-configured on the turntable to form a detection loop. The controller is communicatively connected to the lifting mechanism and the detection circuit. The controller is used to send a position signal to the lifting mechanism when it receives a current signal from the detection circuit. The controller is also used to determine the resistance value of the counterweight resistor in the detection circuit based on the current signal of the detection circuit, and to determine the actual weight of the counterweight hanging on the turntable based on the resistance value of the counterweight resistor in the detection circuit.

2. The resistance-type crane counterweight detection system according to claim 1, characterized in that, The counterweight is provided in multiple parts, and each counterweight circuit is equipped with a circuit switch; the counterweight connectors between adjacent counterweights are interconnected, and by controlling the opening and closing state of the circuit switches in each counterweight circuit, the counterweight resistors of multiple counterweights can be connected in series to the detection circuit.

3. The resistance-type crane counterweight detection system according to claim 1, characterized in that, The counterweight includes a main counterweight and a side counterweight. The main counterweight and the side counterweight are matched with the counterweight resistance according to the first rule and the second rule, respectively.

4. The resistance-type crane counterweight detection system according to claim 1, characterized in that, The controller is also communicatively connected to a working condition matching module, which sends the weight signal of the actual weight of the counterweight to the working condition matching module for crane working condition matching.

5. The resistance-type crane counterweight detection system according to claim 1, characterized in that, Also includes: The display is communicatively connected to the controller. The controller sends a position signal to the lifting mechanism and a lifting position display signal to the display at the same time. The controller is also used to send a weight display signal of the actual weight of the counterweight to the display.

6. A method for detecting the counterweight of a resistance crane, characterized in that, The method, based on the resistance-type crane counterweight detection system according to any one of claims 1-5, comprises: In response to receiving a current signal from the detection circuit, the current value of the detection circuit is determined based on the current signal. The resistance value of the counterweight resistor in the detection circuit is determined based on the current value of the detection circuit, and the actual weight of the counterweight hung on the turntable is determined based on the resistance value. The actual weight signal of the counterweight is sent to the working condition matching module to perform crane working condition matching.

7. The method for detecting the counterweight of a resistance crane according to claim 6, characterized in that, The resistance value of the counterweight resistor in the detection circuit is determined based on the current value of the detection circuit, including: Based on a pre-built table relating current ranges and resistance values, the resistance value of the counterweight resistor in the detection circuit is determined according to the current range to which the current value of the detection circuit belongs.

8. The method for detecting the counterweight of a resistance crane according to claim 6, characterized in that, When the counterweight includes a main counterweight and a side counterweight, the actual weight combination of the main counterweight and the side counterweight attached to the turntable is determined based on the resistance value of the counterweight resistor.

9. A method for detecting the counterweight of a resistance crane according to claim 6, characterized in that, If no circuit signal is received from the detection loop, a machine-wide movement limit signal is sent to the crane's overall controller; If the current signal received from the detection circuit is lost, the weight signal of the preset counterweight fixed weight will be sent to the working condition matching module to perform crane working condition matching.

10. A crane, characterized in that, The system includes the resistance crane counterweight detection system as described in any one of claims 1-5.

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