A connecting structure using magnetic limit instead of rocker switch

Abstract

The utility model discloses a kind of connection structure using magnetic limit instead of rocker arm switch, it is related to crane accessory technical field, install on girder assembly and trolley running assembly, including N pole magnet, S pole magnet and active contact magnetic switch, N pole magnet and S pole magnet are connected on girder assembly, active contact magnetic switch is connected in trolley running assembly bottom, trolley running assembly is along girder assembly with active contact magnetic switch moves, the moving path of active contact magnetic switch passes through N pole magnet and S pole magnet, distinguishes polarity, obtains the movement position of trolley running assembly.According to the difference of active contact magnetic switch relative position, realize the deceleration of trolley in specified range, parking, it uses non-contact type trigger, without mechanical wear, reach the effect that the reliability of magnetic induction limit switch, service life and environmental safety are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of crane accessories technology, and in particular to a connection structure that uses magnetic limit switches instead of rocker arm switches. Background Technology

[0002] Rubber-tired gantry cranes (RTGs) are the main loading and unloading equipment in modern port container terminals, and their automation level has reached a certain height. As one of the main components of an RTG, the trolley traveling mechanism must also keep pace with the times in terms of safety and automation. Currently, mechanical rocker switches are used on the trolley traveling mechanism, whose main function is to allow the trolley to accelerate, decelerate, and stop within a specified range. However, due to frequent mechanical contact, mechanical rocker switches are prone to contact wear and burning. Therefore, from multiple perspectives, the disadvantages of mechanical rocker switches are quite obvious, and there is an urgent need to replace them with other methods such as magnetic induction limit switches. Utility Model Content

[0003] The purpose of this invention is to provide a connection structure that uses magnetic limit switches instead of rocker switches. Based on the different relative positions of the active contact magnetic switches, the vehicle can decelerate and stop within a specified range. It adopts non-contact triggering, has no mechanical wear, and greatly improves the reliability, service life and environmental safety of the magnetic induction limit switch.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A connection structure that uses magnetic limit switches instead of rocker switches is installed on a main beam assembly and a trolley traveling assembly. It includes an N-pole magnet, an S-pole magnet, and an active contact magnetic switch. The N-pole magnet and the S-pole magnet are connected to the main beam assembly, and the active contact magnetic switch is connected to the bottom of the trolley traveling assembly. The trolley traveling assembly moves along the main beam assembly with the active contact magnetic switch. The movement path of the active contact magnetic switch passes through the N-pole magnet and the S-pole magnet, distinguishing the polarity and obtaining the movement position of the trolley traveling assembly.

[0005] By adopting the above technical solution, the trolley can decelerate and stop within a specified range based on the different relative positions of the active contact magnetic switches. The N-pole magnet and the S-pole magnet respectively sense the position of the trolley's traveling component in two directions, so that the trolley's traveling component can accelerate or decelerate within a set range. It adopts non-contact triggering, has no mechanical wear, and greatly improves the reliability, service life and environmental safety of the magnetic induction limit switch.

[0006] Furthermore, the N-pole magnet and the S-pole magnet are located at both ends of the main beam assembly, and there is a gap between them and the corresponding end points of the main beam assembly. The trolley traveling assembly decelerates after sensing the N-pole magnet or S-pole magnet at the corresponding end according to its own direction of movement.

[0007] By adopting the above technical solution, after the trolley traveling component senses the corresponding N-pole magnet or S-pole magnet in the direction of movement, the trolley traveling component decelerates, thus completing the accelerated movement of the crane traveling mechanism and the deceleration and stopping after reaching the edge position.

[0008] Furthermore, the active contact magnetic switch includes a magnetic field sensing element to distinguish polarity.

[0009] By adopting the above technical solution, the magnetic field sensing element can distinguish polarity and realize the differentiation between the positions of the N-pole magnet and the S-pole magnet.

[0010] Furthermore, the magnetic field sensing element is a Hall element, which generates a Hall voltage under the action of a magnetic field, and the direction of the magnetic field determines the positive or negative sign of the Hall voltage.

[0011] By adopting the above technical solution, the direction of the magnetic field determines the positive and negative signs of the Hall voltage, thus distinguishing the positions of the corresponding N-pole magnet and S-pole magnet.

[0012] Furthermore, the Hall voltage generated by the Hall element is VH. When the N-pole magnet is close, VH>0, and when the S-pole magnet is close, VH<0.

[0013] By adopting the above technical solution, when an N-pole magnet or a S-pole magnet is brought close together, the positive or negative value of the Hall voltage can be used to distinguish them.

[0014] Furthermore, the Hall voltage, after being processed by a differential amplifier and a comparator, drives the output stage to turn on / off, forming a signal that is sent to the vehicle's walking assembly.

[0015] By adopting the above technical solution, the subsequent signal processing of Hall voltage was realized.

[0016] Furthermore, the magnetic field sensing element is a magnetoresistive element.

[0017] By adopting the above technical solution, the magnetoresistive sensor can distinguish polarity and differentiate the positions of the N-pole magnet and the S-pole magnet. Furthermore, the output stage is a transistor.

[0018] By adopting the above technical solution, the transistor is turned on or off to achieve signal output.

[0019] In summary, this utility model has the following beneficial effects: The connection method of this application has significant advantages in terms of reliability, lifespan, and environmental adaptability; (1) In terms of lifespan, mechanical rocker switches are prone to contact wear and burning due to frequent mechanical contact, resulting in a shorter lifespan. In contrast, magnetic induction limit switches use non-contact triggering, have no mechanical wear, significantly extend lifespan, and have lower maintenance costs. (2) In terms of reliability, mechanical rocker switches are prone to signal jitter or false triggering under vibration and impact environments, which affects the stability and safety of the system. Magnetic induction limit switches are not affected by these factors, and the signal is more stable and reliable, which can reduce the risk of false triggering. (3) In terms of environmental adaptability, mechanical rocker switches are prone to contact corrosion and contamination in harsh environments such as high temperature, high humidity, and dust, which affects their service life and reliability. Magnetic induction limit switches usually have good sealing and environmental resistance, can work stably in harsh industrial environments, and are applicable to a wider range of scenarios. (4) In terms of signal transmission, mechanical rocker switches rely on mechanical contacts to transmit signals, which are susceptible to line interference and poor contact. Magnetic induction limit switches output signals through transistors or relays, which are more stable and have strong anti-interference capabilities, making them suitable for long-distance transmission. (5) During installation and commissioning, mechanical rocker switches need to be precisely aligned with the mechanical movement path and require regular inspection and maintenance. Magnetic induction limit switches are easy to install and flexible to debug, and do not require precise alignment, which greatly reduces the workload of installation and maintenance. Attached Figure Description

[0020] To more clearly illustrate the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of a connection structure that uses magnetic limit to replace a rocker switch according to this utility model.

[0022] In the diagram, 1. Active contact magnetic switch; 2. N pole magnet; 3. S pole magnet; 4. Main beam assembly; 5. Car travel assembly. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation on this utility model. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0024] A connection structure that uses magnetic limit switches instead of rocker switches, such as Figure 1As shown, the components installed on the main beam assembly 4 (left) and the trolley traveling assembly 5 include an N-pole magnet 2 (BP20N), an S-pole magnet 3 (BP20S), and an active contact magnetic switch 1 (BN20-11rz). The N-pole magnet 2 and the S-pole magnet 3 are connected to the main beam assembly 4. The active contact magnetic switch 1 is connected to the bottom of the trolley traveling assembly 5. The trolley traveling assembly 5 moves along the main beam assembly 4 with the active contact magnetic switch 1. The moving path of the active contact magnetic switch 1 passes through the N-pole magnet 2 and the S-pole magnet 3, distinguishes the polarity, and obtains the moving position of the trolley traveling assembly 5.

[0025] like Figure 1 As shown, the N-pole magnet 2 and the S-pole magnet 3 are located at both ends of the main beam assembly 4, and there is a gap between them and the corresponding end points of the main beam assembly 4. The trolley traveling assembly 5 decelerates after sensing the N-pole magnet 2 or the S-pole magnet 3 at the corresponding end according to its own moving direction.

[0026] like Figure 1 As shown, the active contact magnetic switch 1 includes a magnetic field sensing element to distinguish polarity; in this embodiment, the magnetic field sensing element is a Hall element, which generates a Hall voltage under the action of a magnetic field, and the direction of the magnetic field determines the positive or negative of the Hall voltage; in some embodiments, the magnetic field sensing element may also be a magnetoresistor, etc. When the magnetic field is perpendicular to the surface of the component, the charge carriers are deflected by the Lorentz force, generating a Hall voltage VH: ; Where I: input current; B: magnetic flux density; RH: Hall coefficient; d: component thickness; Polarity determination: The direction of the magnetic field (N / S poles) determines the polarity of the Hall voltage: when the N pole magnet 2 is close, VH>0, and when the S pole magnet 3 is close, VH<0.

[0027] like Figure 1 As shown, the specific signal processing circuit is as follows: After the Hall voltage is processed by the differential amplifier and comparator, it drives the output stage (e.g., the output stage is a PNP transistor) to turn on / off, forming a signal sent to the car walking component 5; For example, when the N pole of a magnet is brought close, the Hall element generates a positive voltage, the comparator flips (the threshold is usually ±3mT), and then the PNP transistor turns on, the black line outputs a high level (+24V), and the red LED lights up (indicating N pole trigger). Similarly, when the magnet's S pole is close, the Hall element generates a negative voltage, and the green LED lights up (but the output remains off). An additional connection (white wire) is required to capture the S pole signal.

[0028] Working principle: N-pole magnet 2 (BP20N) and S-pole magnet 3 (BP20S) are installed at both ends of the left beam structure (beam assembly 4) of the RTG. An active contact magnetic switch 1 (BN20-11rz) is installed at the bottom of the trolley structure 5. When the trolley moves forward, the active contact magnetic switch 1 moves with the trolley. When the active contact magnetic switch 1 senses the S-pole magnet 3, the trolley begins to decelerate. When the active contact magnetic switch 1 is in front of the S pole magnet 3 and the car is reversing, the car will not slow down when it senses the S pole magnet 3, and the car will move backward until the active contact magnetic switch 1 senses the N pole magnet 2. When the car is behind the N pole magnet 2 and moves forward, it will not slow down when it senses the N pole magnet (BP20N) 2.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Those skilled in the art can make various modifications or equivalent substitutions to the present utility model within its substance and protection scope, and such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present utility model's technical solution.

Claims

1. A connection structure that uses a magnetic limit switch instead of a rocker switch, characterized in that: Installed on the main beam assembly and the trolley traveling assembly, it includes an N-pole magnet, an S-pole magnet, and an active contact magnetic switch. The N-pole magnet and the S-pole magnet are connected to the main beam assembly, and the active contact magnetic switch is connected to the bottom of the trolley traveling assembly. The trolley traveling assembly carries the active contact magnetic switch along the main beam assembly. The movement path of the active contact magnetic switch passes through the N-pole magnet and the S-pole magnet, distinguishing the polarity and obtaining the movement position of the trolley traveling assembly.

2. The connection structure using magnetic limit switches instead of rocker switches according to claim 1, characterized in that: The N-pole magnet and the S-pole magnet are located at both ends of the main beam assembly, and there is a gap between them and the corresponding end points of the main beam assembly. The trolley traveling assembly decelerates after sensing the N-pole magnet or S-pole magnet at the corresponding end according to its own direction of movement.

3. A connection structure using a magnetic limit switch instead of a rocker switch according to claim 1 or 2, characterized in that: The active contact magnetic switch includes a magnetic field sensing element to distinguish polarity.

4. The connection structure using magnetic limit switches instead of rocker switches according to claim 3, characterized in that: The magnetic field sensing element is a Hall element, which generates a Hall voltage under the action of a magnetic field. The direction of the magnetic field determines the positive or negative sign of the Hall voltage.

5. The connection structure using magnetic limit switches instead of rocker switches according to claim 4, characterized in that: The Hall voltage generated by the Hall element is VH. When the N-pole magnet is close, VH>0, and when the S-pole magnet is close, VH<0.

6. The connection structure using magnetic limit switch instead of rocker switch according to claim 4, characterized in that: The Hall voltage, after being processed by a differential amplifier and comparator, drives the output stage to turn on / off, forming a signal that is sent to the vehicle's walking assembly.

7. The connection structure using magnetic limit switch instead of rocker switch according to claim 3, characterized in that: The magnetic field sensing element is a magnetoresistive element.

8. The connection structure using magnetic limit switch instead of rocker switch according to claim 6, characterized in that: The output stage is a transistor.

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