A novel height detection structure for the telescopic extension of a forklift gantry

Abstract

This utility model discloses a novel height detection structure for the extension and retraction of a forklift gantry. The structure includes a fixed support structure, a roller trolley structure, a spring, a guide shaft, an anti-loosening nut, a proximity switch, a fixed clamp, a detection plate, and detection blocks. The fixed support structure is fixed to the outer gantry. The roller trolley structure is softly connected to the fixed support via the spring and guide shaft. The proximity switch is fixed to the roller trolley structure. The detection plate is located at the top and bottom of the inner gantry, and the detection blocks are evenly distributed along the inner gantry. During operation, the proximity switch generates a pulse signal through the detection blocks and converts it into the gantry height. The detection plate then stops the machine at its extreme positions. This utility model eliminates the need for a pull-wire sensor, significantly improving reliability and detection accuracy. It has a low failure rate and low maintenance costs, effectively ensuring the safety and efficiency of forklift operations. It is suitable for port container forklift gantry height detection scenarios.

Description

Technical Field

[0001] This utility model relates to the technical field of port container hoisting equipment, specifically to a novel height detection structure for the telescopic extension and retraction of a forklift gantry. Background Technology

[0002] With the rapid development of globalization, the throughput of port containers is increasing day by day, and port logistics transportation has become the mainstream mode of transportation. As the core equipment for container handling, the performance optimization of port container stackers is crucial for improving port operation efficiency and enhancing the market competitiveness of enterprises.

[0003] During forklift operation, accurate detection of the gantry extension height is crucial for ensuring operational safety and improving handling efficiency. Currently, existing forklift gantry height measurement mechanisms mainly employ a rope-type structure, where the length of the rope pulled out is fed back to a sensor, thus outputting the gantry's extension height. However, this rope-type measurement mechanism has significant drawbacks: under the frequent lifting and lowering conditions of the forklift gantry, the measuring rope is easily broken, leading to mechanism failure; especially for gantry structures with large extension distances, when the gantry's lifting height reaches tens of meters, the rope will swing significantly, not only easily getting snagged on other objects, affecting the operator's normal operation, but also increasing the frequency of maintenance and significantly raising equipment operating costs.

[0004] Therefore, developing a safe, reliable, accurate, efficient, and long-lasting stacker mast height detection structure has become an urgent need to address the pain points of existing technologies and promote the upgrading of container handling equipment. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a novel height detection structure for the telescopic extension of a forklift gantry, which improves the accuracy of gantry height detection, ensures accurate height data feedback during operation, reduces the failure rate of the detection mechanism, and reduces the frequency of subsequent maintenance of the detection mechanism.

[0006] This utility model is achieved through the following technical solution: A novel height detection structure for the telescopic extension of a forklift gantry, comprising a fixed support structure, a roller trolley structure, a spring, a guide shaft, an anti-loosening nut, a proximity switch, a fixed pipe clamp, a detection plate, and a detection block. The connection relationship and working principle of each component are as follows: The fixed support structure is fixed to the outer gantry structure by bolts, serving as the installation base for the entire detection structure; The roller trolley structure is mounted on a fixed support structure by means of springs, guide shafts and anti-loosening nuts, forming an elastic connection structure; The proximity switch is fixed to the roller trolley structure by a fixing tube clamp and moves synchronously with the roller trolley structure. After the installation position of the proximity switch is adjusted, it can accurately detect the detection plate and the detection block; the detection block is evenly distributed along the height direction of the inner gantry, the spacing between adjacent detection blocks is 190mm, the detection plate is set at the top and bottom of the inner gantry respectively, and the number of detection blocks is adaptively adjusted according to the actual height of the gantry.

[0007] The working process of this detection structure is as follows: Initial state: The inner gantry is fully retracted inside the outer gantry, and two proximity switches simultaneously detect the detection plate. At this point, the system is calibrated to the initial height of the gantry. Lifting process: When the inner gantry detaches from the outer gantry and begins to lift, the two proximity switches face the evenly distributed detection blocks. Since the spacing between the detection blocks is fixed, the two proximity switches cannot detect the same detection block at the same time. The detection signal is filtered by a preset program and converted into a pulse signal. Then, the actual lifting height of the gantry is calculated based on the fixed spacing between the detection blocks. Limit position: When the gantry is raised to the top limit position, the two proximity switches detect the top detection plate simultaneously again, and the system controls the gantry to decelerate and stop running; The descent process: The detection principle of the gantry descent process is the same as that of the lifting process. When the gantry is lowered to the bottom limit position, the proximity switch detects the detection plate at the bottom, and the gantry stops moving.

[0008] The proximity switch is connected to the fixed support structure via a roller trolley structure. Under the elastic force of the spring, the roller trolley always fits against the surface of the inner gantry, ensuring that the detection distance between the proximity switch and the detection plate and detection block remains constant, thus guaranteeing detection accuracy.

[0009] The beneficial effects of this utility model are: significantly improved reliability: the traditional easily damaged pull-wire sensor is eliminated, and a design combining mechanical structure and proximity switch is adopted, avoiding problems such as the measuring rope breaking or snagging during swing. The mechanism is more durable and the stability of equipment operation is greatly improved. Higher detection accuracy: By setting small detection blocks at fixed intervals, combined with signal filtering and conversion by dual proximity switches, the height of the gantry can be accurately fed back, solving the problem of insufficient accuracy of traditional visual inspection or rope-type measurement; Reduced maintenance costs: The simple and reliable structural design results in a low failure rate, reducing the number of subsequent repairs and maintenance costs, and extending the overall service life of the equipment; Enhanced safety: By detecting the long plate, the system automatically decelerates and stops the gantry at its extreme positions, effectively preventing safety accidents caused by excessive extension and retraction of the gantry and improving operational safety. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0011] Figure 1 This is a schematic diagram illustrating the working principle of the proximity switch mechanism of this utility model; Figure 2 This is a schematic diagram of the component assembly of the testing mechanism of this utility model; Figure 3 This is an enlarged schematic diagram of the present invention.

[0012] The markings in the diagram are as follows: 1-Fixed bracket structure, 2-Roller trolley structure, 3-Spring, 4-Guide shaft, 5-Anti-loosening nut, 6-Proximity switch, 7-Fixed pipe clamp, 8-Detection plate, 9-Detection block. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0015] like Figures 1 to 3 As shown, this utility model discloses a novel height detection structure for the telescopic extension of a forklift gantry, comprising a fixed support structure 1, a roller trolley structure 2, a spring 3, a guide shaft 4, an anti-loosening nut 5, a proximity switch 6, a fixed pipe clamp 7, a detection plate 8, and a detection block 9.

[0016] During installation, first, the fixed bracket structure 1 is secured to the preset installation position on the outer gantry using high-strength bolts to ensure a firm and secure installation. Then, the spring 3 and guide shaft 4 are sequentially assembled into the corresponding mounting holes of the roller trolley structure 2. Next, the roller trolley structure 2 is connected to the fixed bracket structure 1 using anti-loosening nuts 5. The tightness of the anti-loosening nuts 5 is adjusted to ensure the spring 3 is under moderate compression, guaranteeing that the roller trolley structure 2 can move flexibly and always maintains its elastic force against the inner gantry. Then, two proximity switches 6 are symmetrically fixed to the mounting plane of the roller trolley structure 2 using fixing clamps 7. The detection direction of the proximity switches 6 is adjusted to align with the detection area on the inner gantry. Finally, the detection plates 8 are welded or bolted to the top and bottom of the inner gantry. Detection blocks 9 are evenly welded along the height of the inner gantry, with the spacing between adjacent detection blocks 9 strictly controlled at 190mm. The number of detection blocks 9 is determined based on the maximum lifting height of the gantry, ensuring that the proximity switches 6 can continuously detect the signal from the detection blocks 9 throughout the entire telescopic stroke of the gantry.

[0017] During operation, with the inner gantry fully retracted, both proximity switches 6 simultaneously detect the bottom detection plate 8, and the system sets the gantry height to 0 at this time. When the gantry is raised, the inner gantry moves upward relative to the outer gantry, and the roller trolley structure 2, under the action of the spring 3, always moves synchronously against the inner gantry. The two proximity switches 6 sequentially detect the evenly distributed detection blocks 9. Since the spacing of the detection blocks 9 is fixed, the two proximity switches 6 cannot simultaneously trigger the signal of the same detection block 9. The system filters the pulse signal and, combined with the preset spacing parameter of 190mm, calculates the lifting height of the gantry in real time and feeds it back to the operation control system. When the gantry approaches the top limit position, both proximity switches 6 simultaneously detect the top detection plate 8, and the system immediately issues a deceleration signal. The gantry decelerates until it comes to a complete stop to avoid collision damage. The gantry descent process is the same as the lifting process, and it eventually stops at the initial calibration position.

[0018] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel height detection structure for the telescopic extension and retraction of a forklift gantry, characterized in that: The device includes a fixed support structure (1), a roller trolley structure (2), a spring (3), a guide shaft (4), a lock nut (5), a proximity switch (6), a fixed pipe clamp (7), a detection long plate (8), and detection blocks (9). The fixed support structure (1) is fixed to the outer gantry structure with bolts. The roller trolley structure (2) is installed on the fixed support structure (1) by a combination of spring (3), guide shaft (4), and lock nut (5). The proximity switch (6) is fixed to the roller trolley structure (2) by a fixed pipe clamp (7). The detection long plate (8) is set at the top and bottom of the inner gantry. The detection blocks (9) are evenly distributed along the height direction of the inner gantry.

2. The novel height detection structure for the telescopic extension and retraction of a forklift gantry according to claim 1, characterized in that: The number of proximity switches (6) is two. The two proximity switches (6) are arranged symmetrically and can detect the detection plate (8) at the same time, but cannot detect the same detection block (9) at the same time.

3. A novel height detection structure for the telescopic extension and retraction of a forklift gantry according to claim 1, characterized in that: The adjacent spacing of the detection blocks (9) is 190mm, and the number of detection blocks (9) is adjusted according to the height of the gantry.

4. The novel height detection structure for the telescopic extension and retraction of a forklift gantry according to claim 1, characterized in that: The roller trolley structure (2) is connected to the fixed support structure (1) by a spring (3), so that the roller trolley structure (2) is always attached to the surface of the inner gantry.

5. A novel height detection structure for the telescopic extension and retraction of a forklift gantry according to claim 2, characterized in that: When the proximity switch (6) detects the detection block (9), it generates a pulse signal. The pulse signal is converted into the gantry running height by the program. When the two proximity switches (6) detect the detection plate (8) at the same time, they control the gantry to decelerate and stop running.

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