A crawler crane telescopic boom built-in length detection and torque limiting system

Abstract

This utility model discloses a built-in length detection and torque limiting system for a crawler crane telescopic boom, including a torque display controller. The input terminal of the torque display controller is connected to a cylinder displacement sensor, an angle sensor, a hydraulic pressure sensor, a height limiter, and an anemometer. The output terminal of the torque display controller is connected to a three-color warning light, a buzzer, a luffing control valve, a boom extension control valve, and a hook lifting control valve. This utility model uses a magnetostrictive cylinder inside the telescopic boom, avoiding the risk of damage from harsh environments to length sensors installed externally. The magnetostrictive cylinder sensor has high accuracy, enabling more precise calculation of the boom length, thus improving the overall reliability of the torque limiting system.

Description

Technical Field

[0001] This utility model relates to the field of cranes, and in particular to a built-in length detection and measurement and torque limiting system for the telescopic boom of a crawler crane. Background Technology

[0002] Telescopic boom crawler cranes are all equipped with a torque limiting system, which is a safety protection system. It mainly includes a length sensor for measuring boom length, an angle sensor for detecting boom luffing angle, a hydraulic sensor for detecting luffing cylinder pressure, a height limit switch for detecting hook overwinding, and a torque display controller. Among them, boom length detection and measurement are basically achieved by a length sensor installed on one side of the boom.

[0003] Currently, conventional telescopic boom cranes primarily use length sensors to detect boom length. The length sensor is mounted on the main boom, and a measuring cable fixing device is installed at the front telescopic boom head. The measuring cable extending from the length sensor travels along the pressure roller and is fixed to the fixing device at the boom head. During the telescopic boom's extension and retraction, the measuring cable moves back and forth along the trajectory defined by the pressure roller under the traction of the boom head fixing device. Changes in the length of the measuring cable cause corresponding changes in the electrical signal inside the length sensor. The torque display controller calculates the received length sensor signal and converts it into the corresponding boom length, thus achieving real-time boom length detection. In actual operation, because the length sensor is installed on the outside of the boom, the measuring cable is exposed to the external environment and is susceptible to damage from harsh working conditions, potentially causing component damage and affecting product safety.

[0004] Therefore, it is necessary to develop new length detection and torque limiting systems to overcome the above problems. Utility Model Content

[0005] Purpose of the utility model: To address the shortcomings and defects of the existing technology, this utility model provides a built-in length detection and torque limiting system for the telescopic boom of a crawler crane. The telescopic boom uses a magnetostrictive cylinder, which avoids the risk of length sensors installed on the outside of the boom being damaged by harsh environments. The magnetostrictive cylinder sensor has high accuracy and can more accurately calculate the length of the boom. The overall reliability of the torque limiting system is improved.

[0006] Technical Solution: This utility model discloses a built-in length detection and torque limiting system for a crawler crane telescopic boom, characterized in that it includes a torque display controller; the input end of the torque display controller is connected to a cylinder displacement sensor, an angle sensor, a hydraulic pressure sensor, a height limiter, and an anemometer; the output end of the torque display controller is connected to a three-color warning light, a buzzer, a luffing control valve, a boom extension control valve, and a hook lifting control valve.

[0007] The cylinder displacement sensor is located on the side of the telescopic boom cylinder.

[0008] The cylinder displacement sensor and the telescopic arm cylinder are located inside the telescopic arm.

[0009] The telescopic boom cylinder is a magnetostrictive telescopic cylinder.

[0010] The telescopic boom is located on a crawler crane.

[0011] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The present invention uses a magnetostrictive hydraulic cylinder inside the telescopic boom of the crawler crane. A linear displacement sensor is installed on the hydraulic cylinder. The extension length of the hydraulic cylinder is measured by the interaction between the magnetic field and the stress wave. The current length of the telescopic boom is calculated by a certain calculation formula, thereby replacing the function of the length sensor. The hydraulic cylinder is installed inside the boom and is not affected by the external environment. It has a long service life and is safe and reliable. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of an existing tracked crane torque limiting system;

[0013] Figure 2 A schematic diagram of the existing arm length sensor for length detection and measurement.

[0014] Figure 3 This is a schematic diagram of the structure of this utility model;

[0015] Figure 4 This is a schematic diagram of the displacement sensor of this utility model;

[0016] In the diagram, 1 is a length sensor; 2 is a length measuring cable; 3 is a pressure roller; 4 is a fixing device; 5 is a cylinder displacement sensor; and 6 is a telescopic arm cylinder. Detailed Implementation

[0017] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] The present invention relates to a magnetostrictive hydraulic cylinder: a hydraulic cylinder on the telescopic boom of a crawler crane equipped with a linear displacement sensor, which measures the extension length of the hydraulic cylinder through the interaction of a magnetic field and a stress wave.

[0019] The schematic diagram of the existing tracked crane torque limiting system is as follows: Figure 1 As shown in the diagram, the arm length sensor is used to detect and measure the length. Figure 2As shown, the length sensor 1 is fixed on the basic arm, and the length measuring cable 2 extending from the length sensor travels along the pressure roller 3 and is fixed to the fixing device 4 at the arm head. During the telescopic arm's telescopic movement, the length measuring cable 2 moves back and forth along the trajectory determined by the pressure roller 3 under the traction of the arm head fixing device 4. The change in the length of the length measuring cable will cause a corresponding change in the electrical signal inside the length sensor 1. The torque display controller calculates the received length sensor signal and converts it into the corresponding arm length, thereby realizing the real-time detection of the arm length.

[0020] This utility model discloses a crawler crane telescopic boom with a built-in length detection and torque limiting system, including a torque display controller. The input terminal of the torque display controller is connected to a cylinder displacement sensor 5, an angle sensor, a hydraulic pressure sensor, a height limiter, and an anemometer. The output terminal of the torque display controller is connected to a three-color warning light, a buzzer, a luffing control valve, a boom extension control valve, and a hook lifting control valve. The cylinder displacement sensor 5 is located on the side of the telescopic boom cylinder 6. The cylinder displacement sensor 5 and the telescopic boom cylinder 6 are located inside the telescopic boom. The telescopic boom cylinder 6 is a magnetostrictive cylinder. The telescopic boom is located on the crawler crane.

[0021] like Figure 3 , Figure 4 The difference between this invention and the torque limiting system of existing telescopic boom crawler cranes lies in the fact that this invention uses a cylinder displacement sensor instead of a length sensor to detect and measure the extension length of the telescopic boom. The system detects the extension length of the cylinder using the cylinder displacement sensor and calculates the extension length of the telescopic boom from this cylinder extension length. The specific working principle is as follows:

[0022] The cylinder with a linear displacement sensor installed on the telescopic boom measures the extension length of the cylinder through the interaction of the magnetic field and stress wave. The extension length of the cylinder and the extension length of the telescopic boom have a certain linear proportional relationship. The torque display controller obtains the extension length of the cylinder through the signal input from the displacement sensor and calculates the extension length of the telescopic boom through internal calculation. In this way, a new torque limiting system with the same function as the original is obtained.

[0023] The telescopic boom cylinder is installed inside the telescopic boom, and the displacement sensor is integrated with the cylinder. This avoids exposure to harsh external environments, essentially eliminating the risk of damage to the displacement sensor caused by the external environment, improving the reliability of electrical components, and thus improving the overall reliability of the torque limiting system protection.

[0024] This invention utilizes a magnetostrictive cylinder internally in the telescopic boom, avoiding the risk of damage from harsh environments associated with externally mounted length sensors. The magnetostrictive cylinder sensor offers high accuracy, enabling more precise calculation of the boom length and improving the overall reliability of the torque limiting system. By replacing the external length sensor with a built-in cylinder displacement sensor, the risk of component failure is reduced; thus, the reliability of the overall torque limiting system is enhanced.

Claims

1. A telescopic boom of a crawler crane with built-in length detection measurement and torque limitation system, characterized by: It includes a torque display controller; the input end of the torque display controller is connected to the cylinder displacement sensor (5), angle sensor, oil pressure sensor, height limiter, and anemometer; the output end of the torque display controller is connected to the three-color warning light, buzzer, luffing control valve, boom extension control valve, and hook lifting control valve.

2. A telescopic boom in-built length detection measuring and torque limiting system for a cable crane according to claim 1, characterized in that: The cylinder displacement sensor (5) is located on the side of the telescopic boom cylinder (6).

3. A telescopic boom in-built length detection measuring and torque limiting system for a cable crane according to claim 2, characterized in that: The cylinder displacement sensor (5) and the telescopic arm cylinder (6) are located inside the telescopic arm.

4. The telescopic boom built-in length detection measuring and moment limiting system for a cable crane according to claim 3, characterized in that: The telescopic arm cylinder (6) is a magnetostrictive cylinder.

5. The crawler crane telescopic boom built-in length detection and measurement and torque limiting system according to claim 3, characterized in that: The telescopic boom is located on a crawler crane.

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