Programmable control cabinet based on PLC

Abstract

The invention relates to the technical field of control cabinets, in particular to a programmable control cabinet based on a PLC (programmable logic controller), which comprises a cabinet body, a plurality of support plates are linearly arrayed on the inner wall of the cabinet body, two bumps are arranged on each of two sides of each support plate, the bumps are fixedly connected with the inner wall of the cabinet body, and the support plates are made of heat conduction materials. The control cabinet is provided with a constant cooling mechanism and an auxiliary cooling mechanism, the constant cooling mechanism realizes ventilation and heat dissipation of air in the cabinet body through cooperative work of an air inlet fan and an exhaust fan, and the exhaust fan can move up and down along a sliding groove under the action of a motor and a threaded rod, so that the exhaust coverage range is expanded; a first semiconductor temperature difference power generation rod in the temperature detection mechanism detects the overall temperature difference inside and outside the cabinet body, a temperature detection assembly detects the temperature in the cabinet body, and a PLC controls the heat dissipation efficiency according to detected temperature information.

Description

Technical Field

[0001] The present invention relates to the technical field of control cabinets, and specifically relates to a PLC programmable control cabinet. Background Art

[0002] The programmable control cabinet based on PLC takes PLC as the core control unit, integrates power modules, input / output modules, communication modules, etc., and can be flexibly programmed according to different industrial control requirements to realize functions such as data acquisition, logical operation, sequential control, and closed-loop regulation; with its advantages of strong anti-interference ability, high reliability, good scalability, etc., it is widely used in automated production lines, power, chemical industry, buildings and other fields, and effectively improves the stability and intelligence level of industrial control systems through standardized design and modular configuration.

[0003] In the field of industrial automation, the heat dissipation performance of PLC programmable control cabinets is crucial for the stable operation of equipment. At present, the cooling methods of traditional control cabinets are relatively single, mostly relying only on simple fans for ventilation and heat dissipation, and it is difficult to flexibly adjust the heat dissipation efficiency according to the actual temperature changes inside and outside the cabinet, resulting in low cooling efficiency, heat accumulation inside the cabinet, and affecting the normal operation of PLC equipment; In addition, the existing control cabinets lack accurate monitoring of the temperature of each layer inside the cabinet, cannot accurately judge the heat distribution, and it is difficult to achieve targeted heat dissipation regulation. Summary of the Invention

[0004] Aiming at the above-mentioned shortcomings of the prior art, the present invention provides a PLC programmable control cabinet, which can effectively solve the problems that the prior art is difficult to flexibly adjust the heat dissipation efficiency according to the actual temperature changes inside and outside the cabinet and cannot accurately dissipate heat according to the heat of each layer in the cabinet.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: The present invention provides a PLC programmable control cabinet, including: A cabinet body, wherein a plurality of support plates are linearly arrayed on the inner wall of the cabinet body, and both sides of the support plate have two bumps, the bumps are fixedly connected to the inner wall of the cabinet body, and the support plate is made of a heat-conducting material; A constant temperature reduction mechanism, the constant temperature reduction mechanism includes a heat dissipation port opened on the inner wall of the cabinet body, two symmetrically arranged sliding grooves are opened on the inner wall of the heat dissipation port, a sliding block is slidably connected in the two sliding grooves, an exhaust fan is slidably connected between the two sliding blocks, an air inlet is opened on the inner wall of the cabinet body, two symmetrically arranged intake fans are arranged in the air inlet, and a filter cover is arranged at the air inlet; Auxiliary cooling mechanism, the auxiliary cooling mechanism includes an air cooling box fixedly connected to the top end of the cabinet body, and a semiconductor refrigeration sheet is embedded in the inner top wall of the air cooling box; Temperature detection mechanism, the temperature detection mechanism includes a first semiconductor thermoelectric generation rod for detecting the temperature difference inside and outside the cabinet body, and the temperature detection mechanism further includes a temperature detection component for the internal temperature of the cabinet body.

[0006] Preferably, the constant cooling mechanism, the constant cooling mechanism further includes a motor fixedly connected to the bottom end of the cabinet body, the output end of the motor is fixedly connected with a threaded rod, and the threaded rod threadedly penetrates through one of the sliding blocks, and a filter screen is arranged at the heat dissipation port.

[0007] Preferably, the auxiliary cooling mechanism further includes an exhaust fan fixedly communicated with the outer wall of the air cooling box, an inclined groove is formed in the inner bottom wall of the air cooling box and inclines towards the direction of the exhaust fan, the refrigerating end of the semiconductor refrigeration sheet is inside the air cooling box, the heat dissipation end of the semiconductor refrigeration sheet is outside the air cooling box, and a plurality of heat conduction plates are fixedly connected to the refrigerating end of the semiconductor refrigeration sheet.

[0008] Preferably, an air outlet pipe is fixedly communicated with the inner wall of the side of the air cooling box away from the exhaust fan, the other end of the air outlet pipe is fixedly connected with an air outlet hood, the outer wall of the air outlet hood is fixedly connected with the outer wall of the filter hood, a drain pipe is fixedly communicated with the inner wall of the side of the air cooling box close to the exhaust fan, and the drain pipe extends to the outside of the air cooling box.

[0009] Preferably, the temperature detection mechanism further includes a first heat conduction sheet fixedly connected to the outer walls of a plurality of support plates, the outer wall of the first heat conduction sheet is in contact with the hot end of the first semiconductor thermoelectric generation rod, and the cold end of the first semiconductor thermoelectric generation rod is outside the cabinet body.

[0010] Preferably, two symmetrically arranged connecting rods are fixedly connected to the outer wall of the side of the exhaust fan facing the inside of the cabinet body, the other ends of the connecting rods are fixedly connected with a fixing ring, the inner walls of the fixing ring are respectively fixedly connected with a second semiconductor thermoelectric generation rod and a third semiconductor thermoelectric generation rod, a second heat conduction sheet is fixedly connected between every two adjacent support plates, and a plurality of second heat conduction sheets are staggered on both sides of the support plates. The second semiconductor thermoelectric generation rod and the third semiconductor thermoelectric generation rod are respectively in intermittent sliding contact with the second heat conduction sheets on both sides. The first semiconductor thermoelectric generation rod, the second semiconductor thermoelectric generation rod, and the third semiconductor thermoelectric generation rod are all electrically connected to a current detector, and the current detector is electrically connected to a PLC controller to form a detection circuit.

[0011] Preferably, adjusting grooves are formed in the inner walls of the opposite sides of the cabinet body, placing grooves are formed at the top and bottom of the adjusting grooves, winding devices are arranged on the inner walls of the placing grooves, a shielding cloth is wound in each winding device, and the shielding cloths in the two winding devices on the same side are fixedly connected to the outer peripheral walls of the second semiconductor thermoelectric generation rod and the third semiconductor thermoelectric generation rod respectively. The second semiconductor thermoelectric generation rod and the third semiconductor thermoelectric generation rod in the cabinet body are both hot ends.

[0012] Preferably, the temperature detection assembly includes a detection box fixedly connected to the inner bottom wall of the cabinet body. A sliding plate is hermetically and slidably connected to the inner wall of the detection box. The sliding plate and the detection box are filled with expansion liquid. An extension plate is fixedly connected to the outer wall of the sliding plate. The other end of the extension plate is fixedly connected to a conductive sheet. A resistance plate is fixedly connected to the inner bottom wall of the cabinet body, and the resistance plate is slidably connected to the conductive sheet. The resistance plate and the conductive sheet form a sliding rheostat. The sliding rheostat is electrically connected to a current detector. The PLC controller is electrically connected to the semiconductor refrigerating sheet, the motor and the exhaust fan to form a heat dissipation loop.

[0013] The technical solution provided by the present invention has the following beneficial effects compared with the known prior art: The control cabinet is provided with a constant temperature reduction mechanism and an auxiliary temperature reduction mechanism. The constant temperature reduction mechanism realizes the heat dissipation of the air flow inside the cabinet body through the coordinated work of the intake fan and the exhaust fan. And the exhaust fan can move up and down along the sliding groove under the action of the motor and the threaded rod to expand the exhaust coverage range. At the same time, the first semiconductor thermoelectric generation rod in the temperature detection mechanism detects the overall temperature difference inside and outside the cabinet body, the temperature detection assembly detects the temperature inside the cabinet, and the PLC controller controls the heat dissipation efficiency according to the detected temperature information. When the temperature difference between the inside and outside of the cabinet is large but the outside temperature of the cabinet is low, the current of the exhaust fan is increased to accelerate heat dissipation; when the temperature difference between the inside and outside of the cabinet is small but the temperature inside the cabinet is high, the auxiliary temperature reduction mechanism is started, the semiconductor refrigerating sheet is energized to refrigerate, and the refrigerating efficiency is accelerated through the heat conduction plate. The low-temperature air enters the cabinet body through the air outlet pipe and the like to cool down.

[0014] In the temperature detection mechanism of the control cabinet, the second semiconductor thermoelectric generation rod and the third semiconductor thermoelectric generation rod are respectively installed on the exhaust fan through fixing rings, and their hot ends are intermittently and slidably in contact with the second heat conduction sheets staggered on both sides of the support plate. When the temperature inside a certain layer of the cabinet body changes, the temperature of the second heat conduction sheet of that layer changes, generating a temperature difference with the hot end of the second semiconductor thermoelectric generation rod or the third semiconductor thermoelectric generation rod. Based on the Seebeck effect, electromotive force and current are generated. After the current detector detects the current signal, it is transmitted to the PLC controller, so as to realize the accurate detection of the temperature difference inside and outside each layer of the cabinet body. When the temperature at a certain place is detected to be too high, the motor is controlled to stop running through the PLC controller, and the rotation speed of the exhaust fan is increased to further increase the heat dissipation efficiency, realizing targeted regulation. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 Schematic three-dimensional structure of the present invention Figure 1 ; Figure 2 Schematic three-dimensional structure of the present invention Figure 2 ; Figure 3 Schematic sectional three-dimensional structure diagram of the present invention; Figure 4 Schematic three-dimensional structure of the present invention Figure 3 ; Figure 5 For the present invention Figure 4 Enlarged three-dimensional view of part A in; Figure 6 Schematic internal three-dimensional structure diagram of the present invention; Figure 7 For the present invention Figure 6 Enlarged three-dimensional view of part B in; Figure 8 Schematic sectional three-dimensional structure diagram of the air cooling box of the present invention.

[0017] Reference numerals: 1, cabinet body; 2, support plate; 3, normal cooling mechanism; 31, heat dissipation port; 32, sliding groove; 33, sliding block; 34, exhaust fan; 35, air inlet; 36, intake fan; 37, filter cover; 38, motor; 39, threaded rod; 310, filter net; 4, auxiliary cooling mechanism; 41, air cooling box; 42, semiconductor refrigeration sheet; 43, air exhauster; 44, heat conduction plate; 45, air outlet pipe; 46, air outlet hood; 47, drain pipe; 5, temperature detection mechanism; 51, first semiconductor thermoelectric generation rod; 52, first heat conduction sheet; 53, connecting rod; 54, fixing ring; 55, second semiconductor thermoelectric generation rod; 56, third semiconductor thermoelectric generation rod; 57, second heat conduction sheet; 58, adjustment groove; 59, temperature detection component; 591, detection box; 592, sliding plate; 593, extension plate; 594, conductive sheet; 595, resistance plate; 510, placement groove; 511, winder; 512, shielding cloth. Detailed implementation manners

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] The present invention will be further described below with reference to the embodiments.

[0020] Embodiment: Refer to Figures 1 to 8 , a PLC programmable control cabinet, comprising: A cabinet body 1, on the inner wall of the cabinet body 1, a plurality of support plates 2 are linearly arrayed, and both sides of the support plate 2 have two bumps, and the bumps are fixedly connected to the inner wall of the cabinet body 1. The support plate 2 is made of a heat-conducting material. Since the support plate 2 is made of a heat-conducting material, the temperature inside the cabinet body 1 will be transferred to the support plate 2 and can be transferred to the first heat-conducting sheet 52 and the second heat-conducting sheet 57 for temperature detection. A constant temperature reduction mechanism 3, the constant temperature reduction mechanism 3 includes a heat dissipation port 31 opened on the inner wall of the cabinet body 1. On the inner wall of the heat dissipation port 31, two symmetrically arranged sliding grooves 32 are opened. A sliding block 33 is slidably connected in the two sliding grooves 32. A exhaust fan 34 is slidably connected between the two sliding blocks 33. An air inlet 35 is opened on the inner wall of the cabinet body 1. Two symmetrically arranged intake fans 36 are arranged in the air inlet 35. A filter cover 37 is arranged at the air inlet 35. The constant temperature reduction mechanism 3 further includes a motor 38 fixedly connected to the bottom end of the cabinet body 1. The output end of the motor 38 is fixedly connected with a threaded rod 39, and the threaded rod 39 threadedly penetrates through one of the sliding blocks 33. A filter screen 310 is arranged at the heat dissipation port 31.

[0021] An auxiliary temperature reduction mechanism 4, the auxiliary temperature reduction mechanism 4 includes an air cooling box 41 fixedly connected to the top end of the cabinet body 1. A semiconductor refrigeration sheet 42 is embedded in the inner top wall of the air cooling box 41. The auxiliary temperature reduction mechanism 4 further includes an exhaust device 43 fixedly communicated with the outer wall of the air cooling box 41. An inclined groove is opened on the inner bottom wall of the air cooling box 41, and the inclined groove inclines towards the exhaust device 43. The refrigerating end of the semiconductor refrigeration sheet 42 is inside the air cooling box 41, and the heat dissipation end of the semiconductor refrigeration sheet 42 is outside the air cooling box 41. A plurality of temperature guiding plates 44 are fixedly connected to the refrigerating end of the semiconductor refrigeration sheet 42.

[0022] On the inner wall of one side of the air cooling box 41 away from the exhaust fan 43, an air outlet pipe 45 is fixedly communicated. The other end of the air outlet pipe 45 is fixedly connected to an air outlet hood 46. The outer wall of the air outlet hood 46 is fixedly connected to the outer wall of the filter hood 37. On the inner wall of one side of the air cooling box 41 close to the exhaust fan 43, a drain pipe 47 is fixedly communicated, and the drain pipe 47 extends to the outside of the air cooling box 41.

[0023] The temperature detection mechanism 5 includes a first semiconductor thermoelectric generator 51 for detecting the temperature difference inside and outside the cabinet 1. The temperature detection mechanism 5 further includes a temperature detection component 59 for the internal temperature of the cabinet 1.

[0024] The temperature detection mechanism 5 further includes a first heat conducting sheet 52 fixedly connected to the outer walls of multiple support plates 2. The outer wall of the first heat conducting sheet 52 is in contact with the hot end of the first semiconductor thermoelectric generator 51, and the cold end of the first semiconductor thermoelectric generator 51 is outside the cabinet 1.

[0025] On the outer wall of one side of the exhaust fan 34 facing the inside of the cabinet 1, two symmetrically arranged connecting rods 53 are fixedly connected. The other end of the connecting rod 53 is fixedly connected to a fixing ring 54. The inner walls of the fixing ring 54 are respectively fixedly connected with a second semiconductor thermoelectric generator 55 and a third semiconductor thermoelectric generator 56. A second heat conducting sheet 57 is fixedly connected between every two adjacent support plates 2, and multiple second heat conducting sheets 57 are staggered on both sides of the support plates 2. The second semiconductor thermoelectric generator 55 and the third semiconductor thermoelectric generator 56 are respectively in intermittent sliding contact with the second heat conducting sheets 57 on both sides. The first semiconductor thermoelectric generator 51, the second semiconductor thermoelectric generator 55, and the third semiconductor thermoelectric generator 56 are all electrically connected to a current detector, and the current detector is electrically connected to a PLC controller to form a detection circuit.

[0026] Adjusting grooves 58 are respectively formed on the inner walls of the opposite sides of the cabinet 1, and placing grooves 510 are formed at the top and bottom of the adjusting grooves 58. A winder 511 is arranged on the inner wall of each placing groove 5, and a shielding cloth 512 is wound in the winder 511. The shielding cloths 512 in the two winders 511 on the same side are respectively fixedly connected to the outer peripheral walls of the second semiconductor thermoelectric generator 55 and the third semiconductor thermoelectric generator 56. The second semiconductor thermoelectric generator 55 and the third semiconductor thermoelectric generator 56 inside the cabinet 1 are both hot ends, and the shielding cloth 512 is used to prevent external dust from entering the inside of the cabinet 1.

[0027] The temperature detection component 59 includes a detection box 591 fixedly connected to the inner bottom wall of the cabinet body 1. The inner wall of the detection box 591 is hermetically and slidably connected with a sliding plate 592. The detection box 591 and the sliding plate 592 are filled with expansion liquid. The outer wall of the sliding plate 592 is fixedly connected with an extension plate 593, and the other end of the extension plate 593 is fixedly connected with a conductive sheet 594. The inner bottom wall of the cabinet body 1 is fixedly connected with a resistance plate 595, and the resistance plate 595 is slidably connected with the conductive sheet 594. The resistance plate 595 and the conductive sheet 594 form a sliding rheostat, and the sliding rheostat is electrically connected with a current detector. The PLC controller is electrically connected with the semiconductor refrigeration sheet 42, the motor 38, and the exhaust fan 34 to form a heat dissipation loop.

[0028] The working principle of the present invention is as follows: First, the inside of the cabinet body 1 is cooled by the constant temperature reduction mechanism 3. It mainly realizes the heat dissipation of the air circulation inside the cabinet body 1 through the coordinated work of the intake fan 36 and the exhaust fan 34. First, control the intake fan 36 to start. The filter cover 37 at the air inlet 35 can filter impurities such as dust in the outside air. The clean air enters the inside of the cabinet body 1 through the air inlet 35. At the same time, the PLC controller controls the motor 38 to start. The output end of the motor 38 drives the threaded rod 39 to rotate. Since the threaded rod 39 threadedly penetrates through one of the sliding blocks 33, under the limitation of the two sliding grooves 32, the exhaust fan 34 will move up and down along the sliding groove 32 to expand the exhaust coverage range. The exhaust fan 34 discharges the hot air inside the cabinet body 1 through the heat dissipation port 31. The filter screen 310 at the heat dissipation port 31 can prevent foreign objects from entering the inside of the cabinet body 1, thereby realizing the circulating heat dissipation of the air inside the cabinet body 1 and achieving the preliminary temperature reduction effect; At the same time, the hot end of the first semiconductor thermoelectric generation rod 51 is connected to the inner support plate 2 of the cabinet body 1 through the first heat conduction sheet 52, and the cold end is placed outside the cabinet body 1. When heat is generated inside the cabinet body 1 due to the operation of equipment, resulting in a temperature difference between the inside and outside of the cabinet body 1, a temperature difference is generated between the hot end and the cold end of the first semiconductor thermoelectric generation rod 51. Based on the Seebeck effect, an electromotive force is generated to form a current (the greater the temperature difference, the greater the generated current. This is the prior art and will not be elaborated too much). After the current detector detects this current signal, it converts it into an electrical signal and transmits it to the PLC controller, thereby realizing the detection of the overall temperature difference between the inside and outside of the cabinet body 1 and providing a basis for the preliminary regulation of heat dissipation; Moreover, by detecting the temperature of the first semiconductor thermoelectric generator 51 through the temperature detection component 59, the temperature difference between the inside and outside of the cabinet can be obtained, and then the outside temperature of the cabinet can be deduced. The detection box 591 is filled with expansion liquid (the expansion liquid is mercury), and the sliding plate 592 is hermetically slidably connected in the detection box 591. When the temperature inside the cabinet body 1 changes, the expansion liquid expands when heated or contracts when cooled, pushing the sliding plate 592 to move. The sliding plate 592 drives the conductive sheet 594 to slide on the resistance plate 595 through the extension plate 593, changing the resistance value of the sliding rheostat formed by the resistance plate 595 and the conductive sheet 594. The resistance value change is converted into an electrical signal and transmitted to the PLC controller through the current detector, thereby detecting the temperature inside the cabinet body 1; When it is known that the outside temperature is low but the temperature difference between the inside and outside of the cabinet is large, it proves that the temperature inside the cabinet is high, not due to the influence of the external temperature, but because the heat generated by the equipment inside the cabinet is large. Therefore, the PLC controller needs to increase the current applied to the exhaust fan 34, thereby increasing the heat dissipation efficiency of the exhaust fan 34 and achieving the heat dissipation effect. On the contrary, if the temperature inside the cabinet is low, the heat dissipation efficiency can be reduced; However, if the temperature difference between the inside and outside of the cabinet is small and the temperature inside the cabinet is very high, it proves that the external temperature is relatively high. Therefore, it is necessary to start the auxiliary cooling mechanism 4. After the semiconductor refrigeration sheet 42 is powered on, the refrigerating end refrigerates inside the air cooling box 41. The cooling efficiency is accelerated through multiple heat conduction plates 44, reducing the air temperature inside the air cooling box 41. The inclined groove on the inner bottom wall of the air cooling box 41 slopes towards the air exhaust device 43, facilitating the condensed water to be discharged from the box body through the drain pipe 47. Under the action of the air exhaust device 43, the low-temperature air enters the inside of the cabinet body 1 through the air outlet pipe 45, the air outlet hood 46 and the filter hood 37, cooling the inside of the cabinet body 1. At the same time, the heat dissipation end of the semiconductor refrigeration sheet 42 is outside the air cooling box 41, dissipating the heat to the external environment to ensure the continuous and stable operation of the semiconductor refrigeration sheet 42, thereby realizing more efficient auxiliary cooling of the inside of the cabinet body 1.

[0029] During the up and down movement of the exhaust fan 34, since the second semiconductor thermoelectric generator 55 and the third semiconductor thermoelectric generator 56 are respectively installed on the exhaust fan 34 through the fixing ring 54, and their hot ends are intermittently slidably in contact with the second heat conduction sheets 57 arranged alternately on both sides of the support plate 2. When the temperature inside a certain layer of the cabinet body 1 changes, causing the temperature of the second heat conduction sheet 57 at this layer to change, generating a temperature difference with the hot ends of the second semiconductor thermoelectric generator 55 or the third semiconductor thermoelectric generator 56. Similarly, an electromotive force and current are generated based on the Seebeck effect. After the current detector detects the current signal, it is transmitted to the PLC controller, thereby realizing the accurate detection of the temperature difference between the inside and outside of each layer of the cabinet body 1 for subsequent targeted and accurate regulation; When it is detected that the temperature at a certain place is too high, the PLC controller controls the motor 38 to stop running and increases the rotation speed of the exhaust fan 34 to further increase the heat dissipation efficiency.

[0030] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A PLC programmable control cabinet, characterized in that, Including: A cabinet body (1), on the inner wall of the cabinet body (1), there are multiple support plates (2) linearly arrayed, and both sides of the support plate (2) have two bumps, the bumps are fixedly connected to the inner wall of the cabinet body (1), and the support plate (2) is made of a heat-conducting material; A constant temperature reduction mechanism (3), the constant temperature reduction mechanism (3) includes a heat dissipation port (31) opened on the inner wall of the cabinet body (1), on the inner wall of the heat dissipation port (31), there are two symmetrically arranged sliding grooves (32), a sliding block (33) is slidably connected in the two sliding grooves (32), a exhaust fan (34) is slidably connected between the two sliding blocks (33), an air inlet (35) is opened on the inner wall of the cabinet body (1), two symmetrically arranged intake fans (36) are arranged in the air inlet (35), and a filter cover (37) is arranged at the air inlet (35); An auxiliary temperature reduction mechanism (4), the auxiliary temperature reduction mechanism (4) includes an air cooling box (41) fixedly connected to the top end of the cabinet body (1), and a semiconductor refrigeration sheet (42) is embedded in the inner top wall of the air cooling box (41); A temperature detection mechanism (5), the temperature detection mechanism (5) includes a first semiconductor thermoelectric generation rod (51) for detecting the temperature difference inside and outside the cabinet body (1), and the temperature detection mechanism (5) also includes a temperature detection component (59) for the internal temperature of the cabinet body (1).

2. The programmable control cabinet based on PLC according to claim 1, characterized in that, The constant temperature reduction mechanism (3), the constant temperature reduction mechanism (3) also includes a motor (38) fixedly connected to the bottom end of the cabinet body (1), the output end of the motor (38) is fixedly connected with a threaded rod (39), and the threaded rod (39) threadedly penetrates through one of the sliding blocks (33), and a filter net (310) is arranged at the heat dissipation port (31).

3. A PLC programmable control cabinet according to claim 2, characterized in that, The auxiliary temperature reduction mechanism (4) also includes an exhaust device (43) fixedly communicated with the outer wall of the air cooling box (41), an inclined groove is opened on the inner bottom wall of the air cooling box (41), and the inclined groove inclines towards the direction of the exhaust device (43), the refrigerating end of the semiconductor refrigeration sheet (42) is inside the air cooling box (41), the heat dissipation end of the semiconductor refrigeration sheet (42) is outside the air cooling box (41), and a plurality of heat conduction plates (44) are fixedly connected to the refrigerating end of the semiconductor refrigeration sheet (42).

4. The programmable control cabinet based on PLC according to claim 3, characterized in that, On the inner wall of the side of the air cooling box (41) away from the exhaust device (43), an air outlet pipe (45) is fixedly communicated, the other end of the air outlet pipe (45) is fixedly connected with an air outlet hood (46), the outer wall of the air outlet hood (46) is fixedly connected with the outer wall of the filter cover (37), on the inner wall of the side of the air cooling box (41) close to the exhaust device (43), a drain pipe (47) is fixedly communicated, and the drain pipe (47) extends to the outside of the air cooling box (41).

5. A PLC programmable control cabinet according to claim 1, characterized in that, The temperature detection mechanism (5) also includes a first heat conduction sheet (52) fixedly connected to the outer walls of the multiple support plates (2), the outer wall of the first heat conduction sheet (52) is in contact with the hot end of the first semiconductor thermoelectric generation rod (51), and the cold end of the first semiconductor thermoelectric generation rod (51) is outside the cabinet body (1).

6. The programmable control cabinet based on PLC according to claim 5, characterized in that, On one side outer wall of the exhaust fan (34) facing the interior of the cabinet body (1), two symmetrically arranged connecting rods (53) are fixedly connected. The other end of the connecting rod (53) is fixedly connected with a fixing ring (54). The inner walls of the fixing ring (54) are respectively fixedly connected with a second semiconductor thermoelectric generation rod (55) and a third semiconductor thermoelectric generation rod (56). A second heat conducting sheet (57) is fixedly connected between every two adjacent support plates (2), and a plurality of second heat conducting sheets (57) are staggered on both sides of the support plate (2). The second semiconductor thermoelectric generation rod (55) and the third semiconductor thermoelectric generation rod (56) are respectively in intermittent sliding contact with the second heat conducting sheets (57) on both sides. The first semiconductor thermoelectric generation rod (51), the second semiconductor thermoelectric generation rod (55), and the third semiconductor thermoelectric generation rod (56) are all electrically connected with a current detector, and the current detector is electrically connected with a PLC controller to form a detection circuit.

7. The programmable control cabinet based on PLC according to claim 6, characterized in that, Adjustment grooves (58) are respectively formed on the inner walls of the opposite sides of the cabinet body (1), and placement grooves (510) are formed at the top and bottom of the adjustment groove (58). A winder (511) is arranged on the inner wall of the placement groove (510). A shielding cloth (512) is wound in the winder (511). The shielding cloths (512) in the two winders (511) on the same side are respectively fixedly connected with the outer peripheral walls of the second semiconductor thermoelectric generation rod (55) and the third semiconductor thermoelectric generation rod (56). The second semiconductor thermoelectric generation rod (55) and the third semiconductor thermoelectric generation rod (56) inside the cabinet body (1) are both hot ends.

8. A PLC programmable control cabinet according to claim 6, characterized in that, The temperature detection component (59) includes a detection box (591) fixedly connected to the inner bottom wall of the cabinet body (1). A sliding plate (592) is hermetically and slidably connected to the inner wall of the detection box (591). The sliding plate (592) and the interior of the detection box (591) are filled with an expansion liquid. An extension plate (593) is fixedly connected to the outer wall of the sliding plate (592). The other end of the extension plate (593) is fixedly connected with a conductive sheet (594). A resistance plate (595) is fixedly connected to the inner bottom wall of the cabinet body (1), and the resistance plate (595) is in sliding connection with the conductive sheet (594). The resistance plate (595) and the conductive sheet (594) form a sliding rheostat. The sliding rheostat is electrically connected with the current detector. The PLC controller is electrically connected with the semiconductor refrigerating sheet (42), the motor (38), and the exhaust fan (34) to form a heat dissipation circuit.

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