Explosion-proof limit switch

Abstract

The utility model relates to the technical field of switches, and discloses an explosion-proof limit switch, which comprises a mounting plate and a switch body, the top of the switch body is provided with a protection assembly, the protection assembly comprises a protection shell, the protection shell is slidably connected to the upper surface of the switch body, the switch body is internally provided with a plurality of clamping grooves, and the clamping grooves are arranged in the switch body. A plurality of connecting frames are fixedly connected to the bottom of the protective shell, connecting blocks which are in bilateral symmetry are fixedly connected to the interiors of the connecting frames, and limiting blocks are slidably connected to the interiors of the connecting blocks. According to the utility model, by directly pulling the protective shell, the connecting block slides in the switch body, and the limiting ball is further driven to contract towards the interior of the connecting block and extrude the first spring to generate elastic deformation, so that the effect of quickly mounting and dismounting the protective shell is realized; the problems of tedious maintenance operation and long time consumption caused by bolt fixed installation of a traditional switch are solved, and the equipment maintenance efficiency and the operation stability are improved.

Description

Technical Field

[0001] This utility model relates to the field of switch technology, and in particular to an explosion-proof limit switch. Background Technology

[0002] In the automated production processes of high-risk industries such as petrochemicals, coal mining, and pharmaceuticals, explosion-proof limit switches play a crucial role as core components for equipment position detection and control. These switches detect changes in the position of mechanical parts and send signals to control the start and stop of equipment, thereby preventing safety accidents caused by equipment operating beyond its limits. Because their working environment is often filled with flammable and explosive gases and dust, extremely high requirements are placed on the explosion-proof performance, protection level, and reliability of the switches. With the continuous improvement of industrial automation, the operating efficiency and stability of equipment are becoming increasingly critical, and more diversified demands are being placed on the performance of explosion-proof limit switches.

[0003] Traditional explosion-proof limit switches typically use a one-piece explosion-proof housing made of die-cast aluminum alloy or stainless steel, which is sealed by bolts to meet explosion-proof standards. Its internal mechanical structure mainly includes a trigger rod, a cam, and a contact assembly. When the mechanical parts move and strike the trigger rod, the trigger rod drives the cam to rotate, which in turn causes the internal contacts to close or open, realizing signal output. To adapt to different installation requirements, screws are often used to fix the base to the equipment. The circuit part adopts current limiting and voltage reduction measures to reduce the risk of electrical sparks and ensure safe operation in explosive environments.

[0004] However, in practical applications, existing explosion-proof limit switches are limited by their fixed installation structure. During equipment maintenance, multiple bolts need to be removed using tools to open the casing for inspection or replacement, making the operation process cumbersome. This inefficient installation and maintenance method not only prolongs equipment downtime and increases maintenance costs, but also damages the sealing structure due to frequent disassembly and assembly, reducing explosion-proof performance. In scenarios such as petrochemicals where continuous operation of equipment is extremely important, the inconvenience of installing and maintaining existing switches is particularly prominent, necessitating a more efficient and convenient solution. Therefore, an explosion-proof limit switch is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an explosion-proof limit switch, which aims to improve the problems of existing explosion-proof limit switches, such as cumbersome and time-consuming installation and maintenance operations due to fixed installation and bolt removal, which can easily damage the sealing structure and reduce the explosion-proof performance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An explosion-proof limit switch includes a mounting plate and a switch body, wherein a protective component is provided on the top of the switch body;

[0008] The protective assembly includes a protective shell, which is slidably connected to the upper surface of the switch body. The switch body has multiple slots inside. Multiple connecting brackets are fixedly connected to the bottom of the protective shell. Each of the multiple connecting brackets has a left-right symmetrical connecting block fixedly connected inside. Each of the multiple connecting blocks has a limit block slidably connected inside. Each limit block has a limit ball fixedly connected to one side. A spring is provided on the other side of the limit block. One end of the spring is fixedly connected to the inner wall of the connecting block, and the other end is fixedly connected to the side wall of the limit block. The limit ball engages with the slot. An installation assembly is provided on the top of the mounting plate.

[0009] As a further description of the above technical solution:

[0010] The mounting assembly includes a connecting plate and a fixing bracket. One side of the connecting plate is fixedly connected to the bottom of the switch body, and the bottom of the fixing bracket is fixedly connected to the upper surface of the mounting plate.

[0011] As a further description of the above technical solution:

[0012] The connecting plate has multiple locking blocks fixedly connected inside, and the fixing frame has fixing blocks fixedly connected to its inner wall.

[0013] As a further description of the above technical solution:

[0014] Both sides of the fixed block are fixedly connected to support blocks, and each of the two support blocks is fixedly connected to a connecting column.

[0015] As a further description of the above technical solution:

[0016] The support block has a sliding block inside, and a spring is provided on one side of the sliding block.

[0017] As a further description of the above technical solution:

[0018] One end of the spring is fixedly connected to the side wall of the sliding block, and the other end is fixedly connected to the side of the fixed block.

[0019] As a further description of the above technical solution:

[0020] The bottom of the sliding block is fixedly connected to a limiting frame, and the gap between the limiting frame and the locking block is engaged.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, by directly pulling the protective shell, the connecting block slides inside the switch body, further driving the limiting ball to contract inside the connecting block, compressing the spring to undergo elastic deformation, thereby achieving the effect of quick installation and disassembly of the protective shell. This solves the problem of cumbersome and time-consuming maintenance operations caused by bolt-fixed installation of traditional switches, and improves equipment maintenance efficiency and operational stability.

[0023] 2. In this utility model, by inserting the connecting plate into the fixed frame, and then using the second spring to drive the limit frame to engage in the gaps inside multiple blocks, the limit switch can be quickly fixed, which solves the problem of cumbersome installation and operation of traditional limit switches and improves equipment assembly efficiency. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of an explosion-proof limit switch proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the bottom structure of the protective shell of an explosion-proof limit switch proposed in this utility model;

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 This is a structural schematic diagram of the cross-sectional view of the fixing frame of an explosion-proof limit switch proposed in this utility model;

[0028] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0029] Legend:

[0030] 1. Mounting plate; 2. Switch body; 3. Protective shell; 4. Slot; 5. Connecting bracket; 6. Connecting block; 7. Limiting block; 8. Spring 1; 9. Limiting ball; 10. Connecting plate; 11. Slot; 12. Fixing bracket; 13. Fixing block; 14. Support block; 15. Connecting column; 16. Sliding block; 17. Spring 2; 18. Limiting bracket. Detailed Implementation

[0031] 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.

[0032] Reference Figures 1-3The present invention provides an embodiment of an explosion-proof limit switch, comprising a mounting plate 1 and a switch body 2. The top of the switch body 2 is provided with a protective component, which can effectively prevent interference from external impacts, dust and other harmful substances.

[0033] The protective assembly includes a protective shell 3, which is slidably connected to the upper surface of the switch body 2. It has high flexibility and reliability and can be disassembled and maintained as needed. The switch body 2 has multiple slots 4 inside, which are used to cooperate with the components inside the protective shell 3 to ensure the stability of the entire device during operation. Multiple connecting brackets 5 are fixedly connected to the bottom of the protective shell 3. Each of the multiple connecting brackets 5 has a left-right symmetrical connecting block 6 fixedly connected inside. Each of the multiple connecting blocks 6 has a limit block 7 slidably connected inside. The limit block 7 adjusts its position through a sliding mechanism during operation to achieve the limit function and ensure that the spring 8 will not be excessively deformed and damaged. A limit ball 9 is fixedly connected to one side of the limit block 7, and a spring 8 is provided on the other side of the limit block 7 to provide the necessary restoring force, so that the limit block 7 can slide freely within a certain range and automatically reset after offset. One end of the spring 8 is fixedly connected to the inner wall of the connecting block 6, and the other end is fixedly connected to the side wall of the limit block 7. The limit ball 9 engages with the slot 4. The top of the mounting plate 1 is provided with an installation assembly to facilitate quick installation of the switch by the user.

[0034] Specifically, when explosion-proof limit switches are applied in scenarios such as petrochemical plants requiring frequent online maintenance, food processing equipment requiring daily rapid cleaning and disinfection, mining machinery facing harsh environments requiring regular inspection and maintenance, and automated production line equipment requiring efficient replacement of faulty parts, and when equipment downtime is sensitive and installation and maintenance efficiency is paramount, the user first places the switch body 2 against the protective shell 3 to ensure a stable connection. Then, by pressing the protective shell 3, the user causes the connecting bracket 5 to slide into the slot 4. The slot 4 engages with the connecting bracket 5, allowing it to enter smoothly and generating sufficient pressure to squeeze the limit ball 9. The limit ball 9, under pressure, contracts towards the connecting block 6, further causing the limit block 7 to slide within the connecting block 6. The sliding of the limit block 7 squeezes the spring 8, causing it to elastically deform and store elastic potential energy. This potential energy, later through the elastic restoring force of the spring 8, pushes the limit ball 9 into the slot 4, thus achieving a secure lock on the switch body 2.

[0035] Reference Figure 4 and Figure 5The mounting assembly includes a connecting plate 10 and a fixing bracket 12. One side of the connecting plate 10 is fixedly connected to the bottom of the switch body 2, providing a stable connection force. The bottom of the fixing bracket 12 is fixedly connected to the upper surface of the mounting plate 1. Multiple locking blocks 11 are fixedly connected inside the connecting plate 10, forming a precise fit between the locking blocks 11 and the limiting bracket 18, thus providing a physical limiting function. A fixing block 13 is fixedly connected to the inner wall of the fixing bracket 12. Support blocks 14 are fixedly connected to both sides of the fixing block 13. Connecting posts 15 are fixedly connected inside each of the two support blocks 14. Sliding blocks 16 are slidably connected inside the support blocks 14. The sliding block 16 is able to slide freely under the guidance of the support block 14 and provide an effective adjustment range when needed. A second spring 17 is provided on one side of the sliding block 16. The second spring 17 connects the support block 14 and the fixed point of the sliding block 16, ensuring that the sliding block 16 can quickly reset or adjust under the action of the second spring 17. One end of the second spring 17 is fixedly connected to the side wall of the sliding block 16, and the other end is fixedly connected to the side wall of the fixed block 13. A limit frame 18 is fixedly connected to the bottom of the sliding block 16. The gap between the limit frame 18 and the locking block 11 is engaged to ensure that the component can accurately maintain the set limit, thereby realizing quick locking and unlocking.

[0036] Specifically, during the installation of the switch body 2, the user first presses both sliding blocks 16 simultaneously. The sliding blocks 16, through their sliding function, compress the second spring 17, causing it to deform elastically and store elastic potential energy. Simultaneously, the sliding of the sliding blocks 16 drives the limit frame 18 to move along the trajectory of the support block 14, ensuring precise alignment of the installation components. Next, the user inserts the connecting plate 10 into the fixing frame 12, aligning the gap between the fixing frame 12 and the locking block 11. At this point, the gap between the locking block 11 and the limit frame 18 is precisely aligned, ensuring a secure locking operation. Then, the user releases the pressure on the sliding blocks 16. The second spring 17, under the influence of its stored elastic potential energy, quickly returns to its original shape, causing the sliding blocks 16 to reset. Simultaneously, the sliding blocks 16 reset, causing the limit frame 18 to precisely engage with the gap between the locking blocks 11, thus locking the switch body 2. This allows the user to easily complete the installation of the explosion-proof limit switch, ensuring the equipment can operate safely and stably in complex and hazardous environments.

[0037] Working principle: When using this explosion-proof limit switch, firstly, the operator places the switch body 2 against the protective shell 3. Then, by pressing the protective shell 3, the connecting bracket 5 is driven into the slot 4, thereby squeezing the limit ball 9. This causes the limit ball 9 to retract into the connecting block 6, further driving the limit block 7 to slide inside the connecting block 6. The sliding of the limit block 7 compresses the spring 8, causing the spring 8 to undergo elastic deformation and store elastic potential energy. Then, the elastic restoring force of the spring 8 pushes the limit ball 9 into the slot 4, achieving locking. When installing the switch body 2, firstly, a person presses both sliding blocks 16 simultaneously. The sliding blocks 16 compress the second spring 17, causing it to deform elastically and store elastic potential energy. This, in turn, drives the limit frame 18 to move. Then, the connecting plate 10 is inserted into the fixed frame 12 to align the gap between the fixed frame 12 and the locking block 11. After releasing the force of pressing the sliding blocks 16, the elastic restoring force of the second spring 17 drives the sliding blocks 16 to reset. At the same time, the limit frame 18 is locked into the gap between the locking blocks 11, thus facilitating the installation by the user.

[0038] 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. An explosion-proof limit switch comprising a mounting plate (1) and a switch body (2), characterized in that: The switch body (2) top is provided with a protection assembly; The protection assembly includes a protection shell (3), the protection shell (3) is slidably connected on the upper surface of the switch body (2), a plurality of clamping grooves (4) are formed in the switch body (2), a plurality of connecting frames (5) are fixedly connected to the bottom of the protection shell (3), a plurality of left-right symmetrical connecting blocks (6) are fixedly connected inside the connecting frames (5), a plurality of limiting blocks (7) are slidably connected inside the connecting blocks (6), limiting balls (9) are fixedly connected to one side of the limiting blocks (7), springs (8) are arranged on the other side of the limiting blocks (7), one side of the spring (8) is fixedly connected to the inner wall of the connecting block (6), the other end is fixedly connected to the side wall of the limiting block (7), the limiting ball (9) is clamped with the clamping groove (4), and the mounting plate (1) top is provided with a mounting assembly.

2. The explosion-proof limit switch of claim 1, wherein: The mounting assembly includes a connecting plate (10) and a fixed frame (12), one side of the connecting plate (10) is fixedly connected to the bottom of the switch body (2), and the fixed frame (12) is fixedly connected to the upper surface of the mounting plate (1).

3. The explosion-proof limit switch of claim 2, wherein: The connecting plate (10) is fixedly connected with a plurality of clamping blocks (11) inside, and the fixed frame (12) is fixedly connected with a fixed block (13) on the inner wall.

4. The explosion-proof limit switch of claim 3, wherein: The fixed block (13) is fixedly connected with a support block (14) on both sides, and the connecting column (15) is fixedly connected inside the two support blocks (14).

5. The explosion-proof limit switch of claim 4, wherein: The support block (14) is slidably connected with a sliding block (16) inside, and the sliding block (16) is provided with a spring (17) on one side.

6. The explosion-proof limit switch of claim 5, wherein: One end of the spring (17) is fixedly connected to the side wall of the sliding block (16), and the other end is fixedly connected to the side wall of the fixed block (13).

7. The explosion-proof limit switch of claim 6, wherein: The sliding block (16) is fixedly connected with a limiting frame (18) on the bottom, and the gap between the limiting frame (18) and the clamping block (11) is clamped.

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