A detection mechanism for limiting the position of a dry quenching coke loading device

Abstract

This utility model discloses a detection mechanism for limiting the loading device of a dry quenching coke, including a track support and a trolley track. This utility model employs mechanical mechanisms such as a limit sensing base plate and a track limit switch. In actual use, the entire device is installed at the furnace opening of the dry quenching furnace. The limit support is welded to the base below the trolley track where the rear wheels of the loading trolley are located when the furnace cover is fully open. During subsequent operations, the loading trolley can be pushed by an electro-hydraulic actuator, causing it to move along the trolley track. The track limit detection device of this utility model is installed on the trolley track, providing direct feedback on the actual position of the furnace cover opening. Furthermore, the track limit switch uses magnetic induction to limit the loading device via the limit sensing base plate on the trolley, combining with the stroke limit of the electro-hydraulic actuator to achieve double insurance for limiting the loading device of the dry quenching coke, completely preventing accidents caused by the hoist misjudging the opening position of the loading device.

Description

Technical Field

[0001] This utility model relates to the field of limit detection technology, specifically to a detection mechanism for limiting the position of a dry quenching coke loading device. Background Technology

[0002] Dry Quenching Coke Charging Device: The dry quenching coke charging device is a key piece of equipment in the dry quenching process. Located on the furnace mouth platform of the dry quenching furnace, it handles the loading of red-hot coke from the coke oven into coke hoppers, which are then transported to the upper part of the dry quenching furnace by a hoist. The charging device, positioned at the furnace mouth, acts as a chute when loading the red-hot coke from the coke hoppers into the furnace. The drive mechanism of the charging device is an electro-hydraulic actuator, which drives the charging device trolley, opening the furnace cover and accurately aligning the charging hopper with the furnace mouth. After the red-hot coke is loaded, the furnace cover is closed, returning to the initial state. If the charging device malfunctions and cannot operate normally, red-hot coke cannot be loaded into the dry quenching furnace, affecting production. Most domestic dry quenching coke charging devices limit their limit detection to the stroke detection of the electro-hydraulic actuator, which poses a certain hazard in actual production.

[0003] During normal dry quenching coke production, the elevator and loading device operate automatically without on-site operation; every action is controlled by a program. Each action node of the elevator and loading device is transmitted from the on-site limit signals to the PLC, which then determines the next action command based on the received signals. The elevator is allowed to descend on the coke loading side only when the loading device's open-to-position limit signal is in place. If the loading device is not in the open-to-position position, a false open-to-position signal may occur. For example, in past accidents involving red-hot coke spilling, the limit positioning rod of the loading device disengaged during operation, causing the top of the positioning rod to detach from the hydraulic cylinder piston and accidentally trigger the open-to-position limit switch, forcing the open-to-position limit to remain in place. This allowed the elevator to meet the descent conditions, resulting in a catastrophic accident where a full can of red-hot coke spilled onto the loading device platform. Similarly, malfunctions in the open-to-position limit switch, PLC module, or wiring can also cause the open-to-position limit switch to remain in place. During automatic operation of the elevator in the center, the system may assume the elevator meets the descent conditions and allow descent, leading to catastrophic accidents such as the loading device burning out.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a detection mechanism for limiting the loading of dry quenching coke, which has the advantages of simple structure, good detection effect and convenient use, thereby solving the problems in the background technology mentioned above.

[0007] (II) Technical Solution

[0008] To achieve the advantages of simple structure, good detection effect, and convenient use, the specific technical solution adopted by this utility model is as follows:

[0009] A detection mechanism for limiting the loading of a dry quenching coke charging device includes a track support and a trolley track. The trolley track is installed at the top of the track support, and a loading trolley is movably connected to the surface of the trolley track. The mechanism also includes a limiting bracket, which is welded to a base below the trolley track at the location of the rear wheels of the loading trolley when the furnace cover is fully open, and is perpendicular to the trolley track. A limiting adjustment plate is horizontally fixed at the top of the limiting bracket, and mutually perpendicular track limit switches are movably connected to the limiting adjustment plate. The bottom of the loading trolley is provided with a limiting sensing base plate for sensing the track limit switches. The track limit switch is a two-wire electromagnetic induction proximity switch, and is connected in series with an intermediate relay. The intermediate relay is located in an operating box, which is connected to a PLC signal controller to transmit track limit signals when the limit is in place.

[0010] Preferably, the bottom of the loading trolley is evenly connected to guide wheels via guide wheel mounting brackets.

[0011] Preferably, the bottom plate of the crossbeam is made of iron, the limit sensing bottom plate is composed of the bottom plate of the loading trolley crossbeam, and the limit adjustment plate is parallel to the bottom plate of the crossbeam.

[0012] Preferably, the limit adjustment plate is provided with a threaded mounting hole, and the two-wire electromagnetic induction proximity switch is screwed into the threaded mounting hole to adjust the installation height.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a detection mechanism for limiting the loading of a dry quenching coke device, which has the following beneficial effects:

[0015] (1) This utility model includes mechanical mechanisms such as a limit adjustment plate, a limit sensing base plate, and a track limit switch. In actual use, the device is installed at the furnace mouth of the dry quenching furnace. The limit bracket is welded to the base of the trolley track below the position of the rear wheel of the loading trolley when the furnace cover is fully open. In subsequent operations, the loading trolley can be pushed by the electro-hydraulic push rod. At this time, the loading trolley will move along the trolley track. The track limit detection device of this device is installed on the trolley track, which can intuitively reflect the real position of the furnace cover opening. Combined with the stroke limit of the electro-hydraulic push rod, through automated control, accidents caused by the hoist misjudging the opening position of the access device can be completely avoided.

[0016] (2) This utility model connects the two-wire electromagnetic induction proximity switch signal of the loading device track to the PLC switch quantity, optimizes and improves the PLC program, and only allows the hoist to descend when it detects the track limit and push rod stroke limit at the same time, so as to realize the double insurance of push rod stroke limit and track limit, improve the accuracy of detection effect, make up for the deficiencies and defects of electro-hydraulic push rod stroke detection, and facilitate the loading operation of red coke. If the electro-hydraulic push rod malfunctions, the track limit is further used to avoid misjudgment.

[0017] (3) The signal transmission design of the two-wire electromagnetic induction proximity switch in the track inspection mechanism of this utility model can ensure that when the track limit switch fails, the on-site operator can force the track limit by pulling out the intermediate relay connected in parallel, so that the limit is always maintained, thereby ensuring that the limit can be replaced at any time without affecting production.

[0018] (4) This utility model has a simple structure and is easy to use. At the same time, the installation height can be adjusted by screwing in the threaded mounting hole of the limit adjustment plate through a two-wire electromagnetic induction proximity switch. This can match the different distances between the limit induction base plate and the trolley track under different loading conditions of the loading trolley, avoid collision with the limit induction base plate, and ensure the stable realization of magnetic induction limit.

[0019] (5) The present invention provides a guide wheel on the side of the loading device connecting seat, so that the guide wheel can contact the guide wheel mounting frame, so that when the loading device connecting seat moves on the guide rail through the guide wheel, the guide wheel can correct the deviation and avoid the loading device connecting seat from shifting. The guide wheel mounting frame connected with the guide wheel can improve the stability of the entire trolley operation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the connection between the guide wheel and the guide wheel mounting bracket of this utility model;

[0023] Figure 3 This is a schematic diagram of the limit adjustment plate of this utility model.

[0024] In the picture:

[0025] 1. Track support; 2. Limit support; 3. Track limit switch; 4. Limit adjustment plate; 5. Limit sensing base plate; 6. Loading trolley; 8. Trolley track; 9. Guide wheel; 10. Guide wheel mounting bracket. Detailed Implementation

[0026] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0027] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-3 As shown, a detection mechanism for limiting the loading of a dry quenching coke charging device is disclosed. It includes a track support 1 and a trolley track 8. The trolley track 8 is mounted on the top of the track support 1, and a loading trolley 6 is movably connected to the surface of the trolley track 8. It also includes a limiting bracket 2, which is welded to the base below the trolley track 8 at the position where the rear wheels of the loading trolley 6 are located when the furnace cover is fully open, and is perpendicular to the trolley track. A limiting adjustment plate 4 is horizontally fixed at the top of the limiting bracket 2, and mutually perpendicular track limiting switches 3 are movably connected to the limiting adjustment plate 4. The bottom of the loading trolley 6 is provided with a track limiting switch. The limit sensing base plate 5 is made of iron in this embodiment. Therefore, the limit sensing base plate 5 can be directly formed by the crossbeam base plate of the trolley 6. The limit adjustment plate is parallel to the crossbeam base plate. The track limit switch is a two-wire electromagnetic induction type proximity switch and is connected in series with the intermediate relay. The intermediate relay is located in the operation box. Because the crossbeam base plate is made of iron, a magnetic field will be generated when the track limit switch is energized. When the limit sensing base plate detects a signal, the operation box is connected to the PLC signal to transmit the track limit signal to the correct position.

[0028] Specifically, guide wheels 9 are evenly connected to the bottom of the loading trolley 6 via guide wheel mounting bracket 10.

[0029] Specifically, the limit adjustment plate is provided with threaded mounting holes. The two-wire electromagnetic induction proximity switch is screwed into the threaded mounting holes to adjust the installation height. This can match the different distances between the limit sensing base plate and the trolley track under different loading conditions of the loading trolley, avoid collision with the limit sensing base plate and ensure the stable implementation of magnetic induction limit.

[0030] This device is added to the existing push rod travel limit mechanism. The track limit switch signal for the device being loaded onto the track is connected to the PLC's switching input. The PLC program is optimized so that the hoist is only allowed to descend when both the track limit and push rod travel limit are detected simultaneously, achieving double protection through push rod travel limit and track limit. The specific solution is as follows:

[0031] The track limit switch is a two-wire electromagnetic induction proximity switch with a rated voltage of AC220V. It uses the normally open contact as the operating point, with an intermediate relay coil operating at AC220V. A 2*1.5mm shielded cable connects the proximity switch and the intermediate relay coil in series, using the normally closed contact of the intermediate relay as the operating point to transmit the signal to the PLC. When the track limit switch detects the signal, the intermediate relay connected in series is energized, changing the normally closed contact to a normally open contact, and the PLC detects the track limit signal. The signal cable shield must be properly grounded. A suspended conduit 10mm above the ground should be installed at the loading platform, and the cable connector of the proximity switch must be wrapped with high-temperature resistant flexible tubing.

[0032] In one embodiment, the track limit switch of the track limit detection mechanism can be other types of limit detection switches. The limit installation position can be in other different positions on the trolley track according to the actual site conditions, but the purpose is to add a limit detection device to determine whether the furnace cover is actually opened.

[0033] Working principle: In actual use, the entire device is installed at the furnace mouth of the dry quenching furnace. During subsequent operations, the loading trolley 6 can be pushed by the electro-hydraulic actuator. At this time, the loading trolley 6 will move along the trolley track 8. The track limit detection device is installed on the trolley track, which can intuitively reflect the actual position of the furnace cover opening. When the track limit switch senses the limit sensing base plate through the magnetic field, it transmits the track limit signal to the PLC. The PLC then judges and gives the next action command based on the received signal. The hoist is allowed to descend only when it detects both the track limit and the actuator stroke limit at the same time, thus realizing the actuator stroke limit.

[0034] With the addition of the signal transmission design of the track limit switch, it can be ensured that when the track limit switch fails, the on-site operator can force the track limit to be maintained by pulling out the intermediate relay connected in parallel with it, thus ensuring that the limit can be replaced at any time without affecting production. At the same time, the track limit switch can be adjusted in height and position at will and is easy to replace, so it is very intuitive, convenient and quick in the initial stage of installation and commissioning.

[0035] The track limit switch is an LJ18A3-8-J / DZ type electromagnetic induction proximity switch. It boasts high detection accuracy and a sensing distance of 8mm, fully meeting the precise stopping requirements when the furnace lid is fully open. Furthermore, it features dual protection through both the push rod travel limit and the track limit, completely preventing spillage of red-hot coke due to false push rod limit signals. This electromagnetic induction proximity switch is adaptable to harsh environments such as high temperatures, dust, and rain, has a long service life, and is easy to install and replace.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 detection mechanism for limiting the loading of a dry quenching coke device, comprising a track support (1) and a trolley track (8), characterized in that: The top of the track support (1) is equipped with a trolley track (8), and the surface of the trolley track (8) is movably connected to a loading trolley (6). It also includes a limiting bracket (2). The limiting bracket (2) is welded to the base below the trolley track (8) where the rear wheel of the loading trolley (6) is located when the furnace cover is fully open, and is set perpendicular to the trolley track. The top of the limiting bracket (2) is horizontally fixed with a limiting adjustment plate (4). The limiting adjustment plate (4) is movably connected with mutually perpendicular track limit switches (3). The bottom of the loading trolley (6) is provided with a limit sensing base plate (5) for sensing the track limit switches. The track limit switch is a two-wire electromagnetic induction type proximity switch and the track limit switch is connected in series with an intermediate relay. The intermediate relay is located in the operation box. The operation box is connected to the PLC signal to transmit the track limit signal to the position.

2. The detection mechanism for limiting the loading of a dry quenching coke charging device according to claim 1, characterized in that: The bottom of the loading trolley (6) is evenly connected to guide wheels (9) via guide wheel mounting brackets (10).

3. The detection mechanism for limiting the loading of a dry quenching coke charging device according to claim 1, characterized in that: The limiting sensor base plate (5) is composed of the loading trolley (6) crossbeam base plate, which is made of iron, and the limiting adjustment plate is parallel to the crossbeam base plate.

4. The detection mechanism for limiting the loading of a dry quenching coke charging device according to claim 1, characterized in that: The limit adjustment plate is provided with threaded mounting holes, and the two-wire electromagnetic induction proximity switch is screwed into the threaded mounting holes to adjust the installation height.

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