Sealing mechanism of PLC control cabinet

Abstract

The invention provides a sealing mechanism of a PLC control cabinet, the sealing mechanism comprises a cabinet body, a filter screen and a sealing structure, the sealing structure is arranged on the left side outside the cabinet body, and the sealing structure corresponds to the filter screen. According to the mechanism, the filter screen is physically covered in a non-ventilation state, and after the sealing plate is overturned in place, the sealing plate can be tightly and stably attached to the surface of the filter screen by means of the elastic characteristic of the pressing unit. The tight fitting greatly enhances the sealing performance of the air inlet, and dust, fine particles and other suspended impurities in the external environment can be obviously prevented from entering the control cabinet through the opening. Therefore, the cleanliness of the environment in the cabinet is effectively maintained, and the potential pollution and damage risks of dust to precise electronic elements such as the PLC mainboard and the I / O module are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of control cabinets, in particular to a sealing mechanism of a PLC control cabinet. Background Art

[0002] With the continuous improvement of industrial automation, the stable and reliable operation of programmable logic controllers (PLCs), the core components of automated control systems, is crucial. The PLC control cabinet, a crucial device for protecting the PLC and its associated electrical components, has a direct impact on the lifespan of its internal components and the overall performance of the system.

[0003] In practical applications, PLC control cabinets often face complex and changing environmental conditions, such as dust, moisture, and oil mist. If these environmental factors invade the interior of the cabinet, they may cause poor contact, short circuits, corrosion, or even more serious failures in electrical components, leading to production interruptions or safety accidents.

[0004] To ensure the cleanliness of the PLC control cabinet's internal environment, certain protective measures are typically implemented. Control cabinet ventilation design is a balancing act: on the one hand, proper ventilation and heat dissipation are necessary to maintain the normal operating temperature of internal electrical components, particularly heat-generating components (such as the PLC itself, power modules, and heat sinks). On the other hand, vents become a potential channel for external contaminants to enter the cabinet.

[0005] Currently, many PLC control cabinets feature relatively simple air inlet designs, often featuring only simple shutters or grilles, or no dedicated sealing structure at all. This design can meet cooling requirements when forced or natural ventilation is required. However, when the equipment is not operating, the ambient temperature is moderate, or ventilation needs to be suspended to protect against extreme weather (such as heavy rain or sandstorms), these unsealed air inlets become "open passages." Even if the rest of the control cabinet has a sufficient level of protection, the lack of air inlets allows tiny particles such as dust, fibers, and insects from the external environment to easily enter the cabinet through airflow or natural sedimentation, gradually accumulating and contaminating the internal environment. This persistent, trace accumulation of contamination can also pose a long-term threat to the reliability of the PLC and other sensitive electronic components. Summary of the Invention

[0006] The present invention provides a sealing mechanism for a PLC control cabinet, comprising a cabinet body and a filter screen, wherein an opening is provided on the left side of the cabinet body, and the filter screen is fixedly arranged at the opening on the left side of the cabinet body; a sealing structure is provided on the left side outside the cabinet body, and the sealing structure corresponds to the filter screen; the sealing structure comprises two support seats, a rotating shaft, a motor, a connecting seat, a support plate, a plurality of clamping units and a sealing plate; the two support seats are fixedly arranged on the left side outside the cabinet body, and the two support seats are arranged front and back; the rotating shaft is rotatably connected to the two support seats respectively; the motor is fixedly arranged on the left side outside the cabinet body, and the driving end of the motor is fixedly connected to one end of the rotating shaft; the connecting seat is fixedly sleeved on the rotating shaft; the support plate is fixedly arranged on the bottom of the connecting seat; a plurality of clamping units are fixedly arranged on the support plate, and a sealing plate is also fixedly arranged on the plurality of clamping units.

[0007] Preferably, the clamping unit includes a support tube, a spring, a slide plate and a movable block. The support tube is fixedly arranged on one side of the support plate. The spring is located in the support tube, and one end thereof is fixedly connected to the left side of the support tube. The slide plate is slidably connected to the inner wall of the support tube, and the left side of the slide plate is fixedly connected to the other end of the spring. The movable block moves through the right side of the support tube, and one end of the movable block is fixedly connected to the right side of the slide plate. The left side of the sealing plate is fixedly connected to the other end of the movable block.

[0008] Preferably, a plurality of limiting units are further provided between the support plate and the sealing plate.

[0009] Preferably, the limiting unit is a telescopic rod.

[0010] Preferably, the rotating shaft and the support seat are connected via a bearing, the inner ring of the bearing is interference fit with the rotating shaft, and the outer ring of the bearing is fixedly connected to the support seat.

[0011] The present invention provides a sealing mechanism for a PLC control cabinet through improvements. Compared with the prior art, the present invention has the following improvements and advantages: the present invention drives the rotating shaft and the sealing plate connected thereto to flip through a motor, and the mechanism realizes physical covering of the filter in a non-ventilated state. After the sealing plate is flipped into place, it can form a tight and stable fit with the surface of the filter with the help of the elastic properties of the clamping unit. This tight fit greatly enhances the sealing performance of the air inlet and can significantly block dust, fine particles and other suspended impurities in the external environment from entering the interior of the control cabinet through the opening. As a result, the cleanliness of the environment inside the cabinet is effectively maintained, and the potential pollution and damage risk of dust to precision electronic components such as the PLC mainboard and I / O modules is reduced, thereby improving the operating stability and long-term reliability of the entire control cabinet and its internal equipment, and reducing the failure rate caused by environmental factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the main structure of the sealing structure of the present invention;

[0015] Figure 3 It is a side structural schematic diagram of the support base, rotating shaft, motor, connecting base and support plate of the present invention;

[0016] Figure 4 It is a schematic diagram of the main structure of the compression unit of the present invention.

[0017] Description of reference numerals:

[0018] 1. Cabinet; 2. Filter; 3. Support base; 4. Rotating shaft; 5. Motor; 6. Connecting base; 7. Support plate; 8. Compression unit; 81. Support cylinder; 82. Spring; 83. Slide plate; 84. Movable block; 9. Sealing plate; 10. Telescopic rod. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0021] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense. 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 it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0022] See also Figure 1-4 The present invention provides a technical solution: a sealing mechanism for a PLC control cabinet, comprising a cabinet body 1 and a filter screen 2. An opening is provided on the left side of the cabinet body 1. The filter screen 2 is fixedly arranged at the opening on the left side of the cabinet body 1. The filter screen 2 is used to filter external dust. A sealing structure is provided on the left side outside the cabinet body 1, and the sealing structure corresponds to the filter screen 2. The sealing mechanism is used to seal the filter screen 2 to prevent the filter screen 2 from being contaminated by the outside in a non-ventilated state. The sealing structure comprises two support seats 3, a rotating shaft 4, a motor 5, a connecting seat 6, a support plate 7, a plurality of pressing units 8 and a sealing plate 9. The two support seats 3 are fixedly arranged on the cabinet body 1. The cabinet body 1 is on the left side outside, and the two support seats 3 are arranged front and back. The rotating shaft 4 is rotatably connected to the two support seats 3 respectively. The rotating shaft 4 can rotate stably in the support seat 3. The motor 5 is fixedly arranged on the left side outside the cabinet body 1, and the driving end of the motor 5 is fixedly connected to one end of the rotating shaft 4. The motor 5 is used to drive the rotating shaft 4 to rotate. The connecting seat 6 is fixedly sleeved on the rotating shaft 4, and the support plate 7 is fixedly arranged at the bottom of the connecting seat 6. A plurality of clamping units 8 are fixedly arranged on the support plate 7, and a sealing plate 9 is also fixedly arranged on the plurality of clamping units 8. The clamping unit 8 is elastic, which can make the sealing plate 9 in close contact with the filter screen 2.

[0023] The clamping unit 8 includes a support tube 81, a spring 82, a slide 83 and a movable block 84. The support tube 81 is fixedly arranged on one side of the support plate 7. The spring 82 is located in the support tube 81, and one end thereof is fixedly connected to the left side of the support tube 81. The slide 83 is slidably connected to the inner wall of the support tube 81, and the left side of the slide 83 is fixedly connected to the other end of the spring 82. The movable block 84 is movable through the right side of the support tube 81, and one end of the movable block 84 is fixedly connected to the right side of the slide 83. The left side of the sealing plate 9 is fixedly connected to the other end of the movable block 84.

[0024] A plurality of limiting units are further provided between the support plate 7 and the sealing plate 9 . The limiting units are used to limit the sealing plate 9 to ensure that the sealing plate 9 can move stably in a straight line under the drive of the pressing unit 8 .

[0025] The limiting unit is a telescopic rod 10 .

[0026] The rotating shaft 4 and the support seat 3 are connected through a bearing. The inner ring of the bearing is interference fit with the rotating shaft 4, and the outer ring of the bearing is fixedly connected to the support seat 3.

[0027] Working Principle: When the filter 2 on the left side of the cabinet 1 needs to be sealed to prevent dust from contaminating it, the motor 5 starts and drives the shaft 4 fixed to it to begin rotating. The rotation of the shaft 4 transmits power to the support plate 7 through the connecting base 6 fixed to it, causing the support plate 7 and all its attached components, including the multiple clamping units 8 and the sealing plate 9, to rotate as a whole around the axis of the shaft 4. As the support plate 7 rotates, the movable block 84 fixed to the end of the clamping unit 8 and the sealing plate 9 connected to it rotate from their initial non-operating position to a position covering the filter 2. As the sealing plate 9 moves toward the filter 2 and ultimately contacts it, the multiple clamping units 8 on the support plate 7 begin to function. Once the sealing plate 9 completely covers the filter 2, the elastic force of the spring 82 is transmitted to the sealing plate 9 through the slide 83 and movable block 84, causing it to exert a continuous pressure perpendicular to the surface of the filter 2, ensuring that the sealing plate 9 is tightly attached to the surface of the filter 2, thereby forming an effective sealing barrier between the interior of the cabinet 1 and the external environment, preventing dust and other impurities from entering through the air inlet. When ventilation needs to be restored, the motor 5 rotates in the reverse direction, driving the entire sealing structure to flip in the reverse direction. The spring 82 then releases the previously accumulated energy, assisting the sealing plate 9 to separate from the filter screen 2 and restoring the filter screen 2 to a smooth state.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing mechanism for a PLC control cabinet, characterized in that: The invention comprises a cabinet (1) and a filter (2), wherein the cabinet (1) has an opening on the left side, and the filter (2) is fixedly arranged at the opening on the left side of the cabinet (1). A sealing structure is provided on the left side outside the cabinet (1), and the sealing structure corresponds to the filter (2). The sealing structure comprises two support seats (3), a rotating shaft (4), a motor (5), a connecting seat (6), a support plate (7), a plurality of pressing units (8) and a sealing plate (9). The two support seats (3) are fixedly arranged on the left side outside the cabinet (1). The two support seats (3) are arranged front and back, the rotating shaft (4) is rotatably connected to the two support seats (3) respectively, the motor (5) is fixedly arranged on the left side outside the cabinet (1), and the driving end of the motor (5) is fixedly connected to one end of the rotating shaft (4), the connecting seat (6) is fixedly sleeved on the rotating shaft (4), the supporting plate (7) is fixedly arranged on the bottom of the connecting seat (6), and a plurality of pressing units (8) are fixedly arranged on the supporting plate (7), and a sealing plate (9) is also fixedly arranged on the plurality of pressing units (8).

2. The sealing mechanism of a PLC control cabinet according to claim 1, characterized in that: The pressing unit (8) includes a support tube (81), a spring (82), a slide plate (83) and a movable block (84); the support tube (81) is fixedly arranged on one side of the support plate (7); the spring (82) is located in the support tube (81), and one end of the spring is fixedly connected to the left side of the support tube (81); the slide plate (83) is slidably connected to the inner wall of the support tube (81), and the left side of the slide plate (83) is fixedly connected to the other end of the spring (82); the movable block (84) is movable through the right side of the support tube (81), and one end of the movable block (84) is fixedly connected to the right side of the slide plate (83); the left side of the sealing plate (9) is fixedly connected to the other end of the movable block (84).

3. The sealing mechanism of a PLC control cabinet according to claim 2, characterized in that: A plurality of limiting units are also provided between the support plate (7) and the sealing plate (9).

4. The sealing mechanism of a PLC control cabinet according to claim 3, characterized in that: The limiting unit is a telescopic rod (10).

5. The sealing mechanism of a PLC control cabinet according to claim 1, characterized in that: The rotating shaft (4) and the support seat (3) are connected via a bearing, the inner ring of the bearing and the rotating shaft (4) are interference fit, and the outer ring of the bearing and the support seat (3) are fixedly connected.

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