Checking unit based on PLC control and control device thereof

Abstract

The invention provides an inspection unit based on PLC control and a control device thereof, and relates to the technical field of sizing material heating pretreatment, the inspection unit comprises a sizing material pretreatment mechanism, the sizing material pretreatment mechanism comprises a supporting frame, the top of the supporting frame is obliquely arranged, a conveying belt, an inspection frame and a plurality of fixing frames are arranged on the top of the supporting frame, and the inspection frame and the fixing frames are arranged side by side; the detection frame is provided with a first temperature detection probe used for detecting the temperature of the sizing material below, the conveying belt penetrates through the position below the detection frame and the position between every two fixing frames, detection units are arranged between every two fixing frames, and the multiple detection units, the first temperature detection probe and the conveying belt are electrically connected with the PLC system. The multiple inspection units detect the temperature of the sizing material conveyed on the conveying belt below in more aspects, data detected by the first temperature detection probe and the multiple inspection units are fed back to the PLC system in the mode of an electric signal at the same time, the PLC controls the treatment process, and the system is intelligent, accurate and safe, reduces manpower, saves money, is efficient and is high in intelligent degree.

Description

Technical Field

[0001] The invention relates to the technical field of rubber heating pretreatment, and in particular to a PLC-controlled inspection unit and a control device thereof. Background Art

[0002] The mixing mill is an early equipment used in rubber product manufacturers. On the calender production line, the mixing mill is before the calender and after the mixer. Its function is to mix and plasticize the evenly mixed raw materials, and provide a relatively uniformly mixed and plasticized molten material for the calender to form the rubber products.

[0003] The process of the extruder in the open mill acting on the rubber material is that the rubber material is originally in a highly elastic state, the feeding mechanism conveys the rubber material into the barrel, the screw shears, heats and plasticizes the rubber material, and keeps it at a certain temperature through the heating system of the extruder barrel, and gradually transforms it into a molten state as the screw rotates and advances. However, in production, there are problems such as poor thermal plasticization of the original rubber sheet by the extruder, which leads to quality problems in the extrusion of semi-components, affecting the product delivery efficiency, stability and process operation control of subsequent processes.

[0004] Therefore, it is necessary to design an inspection unit and its control device based on PLC control to overcome the shortcomings in current practical applications. Summary of the invention

[0005] The present invention provides a PLC-controlled inspection unit and a control device thereof, so as to solve the defects in the prior art.

[0006] The present invention provides an inspection unit based on PLC control and a control device thereof, comprising: a rubber pretreatment mechanism, wherein the rubber pretreatment mechanism comprises a support frame, the top of the support frame is arranged obliquely, a conveyor belt, a detection frame, and a plurality of fixed frames are arranged on the top of the support frame, the detection frame and the fixed frame are arranged side by side, a temperature detection probe 1 for detecting the temperature of the rubber below is arranged on the detection frame, the conveyor belt passes from below the detection frame and between each of the fixed frames, an inspection unit is arranged between each of the fixed frames, and the plurality of inspection units, the temperature detection probe 1, and the conveyor belt are electrically connected to a PLC system respectively.

[0007] Preferably, the inspection unit comprises a support plate, which is horizontally arranged in the middle of the support frame, and a circulating water temperature control mechanism and a water pump are fixedly arranged on the support plate, the circulating water temperature control mechanism and the water pump are electrically connected to the PLC system, the water inlet end of the circulating water temperature control mechanism is connected to the water outlet end of the water pump through a hose, a heating roller is arranged between the two fixed frames, the left and right ends of the heating roller are respectively provided with rotating joints, the rotating joints are rotatably arranged in the fixed frames on both sides, and a heating water inlet and a heating water outlet are respectively arranged on the rotating joints on both sides, the heating water inlet is connected to the water outlet end of the circulating water temperature control mechanism through a hose, and the heating water outlet is connected to the water inlet end of the water pump through a hose, a motor is arranged on the top of the fixed frame on one side, a spur gear is arranged at the driving end of the motor through a coupling, a tooth pattern is arranged on the outer surface of the heating roller close to the motor, and the tooth pattern on the outer surface of the heating roller is meshed with the spur gear for transmission.

[0008] Preferably, a hot water inlet pipe is provided in the heating roller, and the hot water inlet pipe is horizontally fixed in the center of the heating roller, and the left and right ends of the hot water inlet pipe are respectively connected to the heating water inlet and the heating water outlet, and a heating circulating water pipe is provided in the outer wall of the heating roller, and the heating circulating water pipe is connected to the hot water inlet pipe.

[0009] Preferably, the circulating water temperature control mechanism comprises a liquid storage box, a plurality of fixed blocks are arranged in the liquid storage box, heating wire tubes are fixedly arranged in the plurality of fixed blocks, and a temperature detection probe 2 is arranged on the inner wall of the liquid storage box.

[0010] Preferably, it also includes: Temperature measurement module 1, used to measure the temperature value at the heating water inlet; Temperature measurement module 2, used to measure the temperature value at the heating water outlet; Temperature measurement module three, used to measure the temperature value of water at the outlet of the water pump; Temperature measurement module 4 is used to measure the temperature value of water at the water inlet end of the water pump; A flow rate detection module, used to detect the real-time flow rate of hot water; Power detection module, used to detect the real-time power value of the water pump; An alarm module, used for issuing an alarm; A calculation module 1, used to calculate the heat exchange amount of the heating roller based on the temperature value at the heating water inlet; Calculation module 2, used for calculating the maximum power of the water pump based on calculation module 1; A processing module, used for comparing the result obtained by the calculation module 2 with the real-time flow rate of the cooling water; Control module, when the real-time power value of the water pump is less than or equal to the maximum power of the water pump, the device works normally. When the real-time power value of the water pump is greater than the maximum power of the water pump, the control alarm module sounds an alarm and the device stops running.

[0011] Preferably, the calculation module 1 calculates based on the following formula 1: ; The heat exchange of the heating roller is is the outer surface area of ​​the heating roller, To heat the water at the water inlet, To heat the water at the water outlet, is the volume flow rate of hot water per unit time, is the constant pressure specific heat capacity of hot water, is the density of hot water, is the radius of the hot water inlet pipe, is the radius of the heating circulating water pipe, is the length of the heating roller, is the Reynolds coefficient of hot water, is the Prandtl number of hot water, is the dynamic viscosity of hot water, is the dynamic viscosity of hot water, is the Stefan–Boltzmann constant, is a constant; The calculation module 2 is calculated based on the following formula 2: ; is the maximum power of the pump, is the acceleration due to gravity, is the head of the pump, is the water temperature at the outlet of the pump, is the water temperature at the water inlet of the pump, The efficiency of the water pump.

[0012] Preferably, a control device based on PLC control is applied to the inspection unit based on PLC control as described in any of the above items, and is characterized in that the control device includes: an electromagnetic valve is provided at the heating water inlet, and the electromagnetic valve is electrically connected to the PLC system.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Pre-treat and heat the rubber material to improve the subsequent extruder's processing performance and smooth processing ability, and ensure the stability and reliability of the subsequent extruder's plasticization of the rubber material. 2. You can select and optimize according to the actual situation to achieve the best processing effect.

[0014] 3. Feedback adjustment closed-loop control, continuous adjustment until the preheating temperature of the extruded rubber material reaches the standard requirement range, ensuring the continuous and stable production 4. The rubber preheating temperature adjustment process is realized, the control process is accurate, and the adjustment speed is fast, which improves the stability of the extrusion size of the extrudate and is conducive to improving product stability.

[0015] 5. Innovatively carry out the rubber preheating process to prevent product quality problems caused by insufficient heating and plasticizing capacity of the extruder in the subsequent production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the 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 creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a heating roller provided in an embodiment of the present invention; Figure 3 It is a structural schematic diagram of a circulating water temperature control mechanism provided in an embodiment of the present invention.

[0018] Reference numerals: 1. Rubber material pretreatment mechanism; 11. Temperature detection probe 1; 12. Support frame; 13. Conveyor belt; 14. Detection frame; 15. Fixed frame; 16. Inspection unit; 161. Support plate; 162. Circulating water temperature control mechanism; 1621. Liquid storage box; 1622. Fixed block; 1623. Heating wire tube; 1624. Temperature detection probe 2; 163. Water pump; 164. Hose; 165. Heating roller; 1651. Hot water inlet pipe; 1652. Heating circulating water pipeline; 166. Rotating joint; 1661. Heating water inlet; 1662. Heating water outlet; 167. Motor; 168. Spur gear; 169. Tooth pattern; 170. Solenoid valve. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0021] The present invention provides the following embodiments Example 1 The embodiment of the present invention provides a PLC-controlled inspection unit 16, such as Figure 1 As shown, it includes: a rubber pretreatment mechanism 1, the rubber pretreatment mechanism 1 includes a support frame 12, the top of the support frame 12 is tilted, a conveyor belt 13, a detection frame 14, and a plurality of fixed frames 15 are arranged on the top of the support frame 12, the detection frame 14 and the fixed frame 15 are arranged side by side, the detection frame 14 is provided with a temperature detection probe 11 for detecting the temperature of the rubber below, the conveyor belt 13 passes from below the detection frame 14 and between the fixed frames 15 in pairs, and an inspection unit 16 is arranged between the fixed frames 15 in pairs, and the plurality of inspection units 16, the temperature detection probe 11, and the conveyor belt 13 are electrically connected to the PLC system respectively.

[0022] The working principle and beneficial effects of the above technical solution are as follows: the support frame 12 supports and fixes the conveyor belt 13, the detection frame 14, and the plurality of fixing frames 15. The top of the support frame 12 is tilted so that the conveyor belt 13 is also tilted, thereby facilitating the passage of the rubber on the conveyor belt 13 and realizing the feeding and transportation process. The detection frame 14 supports the temperature detection probe 11. The temperature detection probe 11 detects the temperature of the rubber transported on the conveyor belt 13 below. The plurality of inspection units 16 detect the temperature of the rubber transported on the conveyor belt 13 below in more directions. The temperature detection probe 11 and the plurality of inspection units 16 detect the temperature of the rubber transported on the conveyor belt 13 below. The measured data is fed back to the PLC system in the form of electrical signals. The PLC system collects and processes the information and feeds back to operate the conveyor belt 13 and the inspection unit 16. The pretreatment mechanism performs a pretreatment heating process on the rubber material to optimize the subsequent extruder's processing performance and smooth processing ability on the rubber material, thereby ensuring the stability and reliability of the subsequent extruder's plasticization of the rubber material. It can also be selected and optimized according to actual conditions to achieve the best processing effect. The PLC controls the processing process, and the pretreatment adjustment process is accurate and the adjustment speed is fast, which is beneficial to improving product stability, intelligent, accurate and safe, and reduces labor, saves money and is efficient, with a high degree of intelligence.

[0023] Example 2 On the basis of Example 1, Figure 1-Figure 3 As shown, the inspection unit 16 includes a support plate 161, which is horizontally arranged in the middle of the support frame 12, and a circulating water temperature control mechanism 162 and a water pump 163 are fixedly arranged on the support plate 161. The circulating water temperature control mechanism 162 and the water pump 163 are electrically connected to the PLC system, and the water inlet end of the circulating water temperature control mechanism 162 is connected to the water outlet end of the water pump 163 through a hose 164. A heating roller 165 is arranged between the two fixed frames 15, and a rotating joint 166 is respectively arranged at the left and right ends of the heating roller 165. The rotating joint 166 is rotatably arranged in the fixed frames 15 on both sides. The rotary joint 166 is respectively provided with a heating water inlet 1661 and a heating water outlet 1662, the heating water inlet 1661 is connected with the water outlet end of the circulating water temperature control mechanism 162 via a hose 164, the heating water outlet 1662 is connected with the water inlet end of the water pump 163 via a hose 164, a motor 167 is provided on the top of the fixed frame 15 on one side, a spur gear 168 is provided at the driving end of the motor 167 via a coupling, a tooth pattern 169 is provided on the outer surface of the heating roller 165 close to the motor 167, and the tooth pattern 169 on the outer surface of the heating roller 165 is meshed with the spur gear 168 for transmission.

[0024] The working principle and beneficial effects of the above technical solution are as follows: the support frame 12 supports and fixes the support plate 161, the support plate 161 supports and fixes the circulating water temperature control mechanism 162 and the water pump 163, the fixed frames 15 at both ends limit the rotation of the rotary joint 166, the rotary joints 166 on both sides fix the middle heating roller 165, the heating roller 165 and the rotary joints 166 on both sides rotate synchronously between the two fixed plates, the fixed plate supports the motor 167, the motor 167 drives the spur gear 168 to rotate through the coupling, the spur gear 168 drives the heating roller 165 to rotate by meshing with the tooth pattern 169 on the outer side of the heating roller 165, the heating roller 165 rolls the rubber on the conveyor belt 13 below, and increases the number of actions of the heating roller 165, thereby achieving the improvement of The effect of the temperature of the rubber material is that the hot water in the circulating water temperature control mechanism 162 is transported from the water outlet of the circulating water temperature control mechanism 162 through the hose 164 to the heating water inlet 1661 and enters the heating roller 165 under the suction force of the water pump 163, so that the temperature of the heating roller 165 increases, and the hot water with a reduced temperature enters the water pump 163 from the heating water outlet 1662 through the hose 164, and then enters the water inlet of the circulating water temperature control mechanism 162 from the water pump 163 through the hose 164. The hot water entering the circulating water temperature control mechanism 162 is recycled after being further heated, which saves water resources while completing the pretreatment of the rubber material. The PLC system controls the circulating water temperature control mechanism 162 and the water pump 163, and controls the temperature and flow rate of the hot water, thereby accurately realizing the heating pretreatment process of the rubber material.

[0025] Example 3 On the basis of Example 2, Figure 1-Figure 3 As shown, a hot water inlet pipe 1651 is provided in the heating roller 165, and the hot water inlet pipe 1651 is horizontally fixedly arranged in the center of the heating roller 165, and the left and right ends of the hot water inlet pipe 1651 are respectively connected to the heating water inlet 1661 and the heating water outlet 1662, and a heating circulating water pipe 1652 is provided in the outer wall of the heating roller 165, and the heating circulating water pipe 1652 is connected to the hot water inlet pipe 1651.

[0026] The working principle and beneficial effects of the above technical solution are as follows: the heating roller 165 supports and fixes the hot water inlet pipe 1651 and the heating circulating water pipe 1652, and heats the outer wall of the heating roller 165 after entering the hot water inlet pipe 1651 and the heating circulating water pipe 1652 from the heating water inlet 1661 of the rotary joint 166, and then the hot water that has lost heat is taken away from the heating roller 165 through the heating water outlet 1662, thereby meeting the heating requirement for the heating roller 165.

[0027] Example 4 On the basis of Example 3, Figure 1-Figure 3 As shown, the circulating water temperature control mechanism 162 includes a liquid storage box 1621, and the liquid storage box 1621 is provided with a water inlet end and a water outlet end. A plurality of fixed blocks 1622 are provided in the liquid storage box 1621, and a heating wire tube 1623 is fixedly provided in the plurality of fixed blocks 1622. A temperature detection probe 1624 is provided on the inner wall of the liquid storage box 1621.

[0028] The working principle and beneficial effects of the above technical solution are as follows: the support plate 161 fixes the liquid storage box 1621, the liquid storage box 1621 fixes the plurality of fixing blocks 1622, and the plurality of fixing blocks 1622 fixes the heating wire tube 1623 to prevent the heating wire tube 1623 from being displaced by the impact of the entering low-temperature hot water. The cooled hot water enters the liquid storage box 1621 from the water inlet end of the liquid storage box 1621 under the suction force of the water pump 163. The entering low-temperature hot water is heated by the heating wire tube 1623 to the temperature preset by the PLC system. The temperature detection probe 1624 detects the temperature of the cylinder tank. The temperature of the internal circulating water is detected and the transmission signal is transmitted to the PLC module of the circulating water temperature control device. The PLC module receives the signal and determines whether it is within the standard requirement range. If it is higher than the standard requirement range, the PLC transmits a signal to the heating wire tube 1623 to control the heating wire tube 1623 to stop running and rely on external heat exchange to cool the circulating heating water. If it is lower than the standard requirement range, the PLC transmits a signal to the heating wire tube 1623 to control the heating wire tube 1623 to run and heat the circulating water, so as to maintain the temperature of the heated circulating water in the cylinder within the standard requirement range.

[0029] Example 5 On the basis of Example 4, it also includes: Temperature measurement module 1, used to measure the temperature value at the heating water inlet 1661; Temperature measurement module 2, used to measure the temperature value at the heating water outlet 1662; Temperature measurement module three, used to measure the temperature value of the water temperature at the outlet of the water pump 163; Temperature measurement module 4, used to measure the temperature value of the water temperature at the water inlet end of the water pump 163; A flow rate detection module, used to detect the real-time flow rate of hot water; A power detection module, used to detect the real-time power value of the water pump 163; An alarm module, used for issuing an alarm; A calculation module 1, for calculating the heat exchange capacity of the heating roller 165 based on the temperature value at the heating water inlet 1661; Calculation module 2, used for calculating the maximum power of the water pump 163 based on calculation module 1; A processing module, used for comparing the result obtained by the calculation module 2 with the real-time flow rate of the cooling water; Control module, when the real-time power value of water pump 163 is less than or equal to the maximum power of water pump 163, the device works normally, and when the real-time power value of water pump 163 is greater than the maximum power of water pump 163, the control alarm module sounds an alarm and the device stops running.

[0030] The working principle and beneficial effects of the above technical solution are as follows: temperature measurement module 1 measures the temperature value at the heating water inlet 1661, temperature measurement module 2 measures the temperature value at the heating water outlet 1662, temperature measurement module 3 measures the temperature value of the water temperature at the outlet end of the water pump 163, temperature measurement module 4 measures the temperature value of the water temperature at the inlet end of the water pump 163, flow rate detection module detects the real-time flow rate of hot water, power detection module detects the real-time power value of the water pump 163, alarm module is used to issue an alarm, calculation module 1 calculates the heat exchange amount of the heating roller 165 based on the temperature value at the heating water inlet 1661, calculation module 2 calculates the maximum power of the water pump 163 based on calculation module 1, processing module compares the result obtained by calculation module 2 with the real-time flow rate of cooling water, when the real-time power value of the water pump 163 is less than or equal to the maximum power of the water pump 163, the device works normally, when the real-time power value of the water pump 163 is greater than the maximum power of the water pump 163, the control module controls the alarm module to issue an alarm, and the device stops running.

[0031] Example 6 Based on Example 5, the calculation module 1 calculates based on the following formula 1: ; is the heat exchange amount of the heating roller 165, is the outer surface area of ​​the heating roller 165, To heat the water temperature at the water inlet 1661, To heat the water temperature at the water outlet 1662, is the volume flow rate of hot water per unit time, is the constant pressure specific heat capacity of hot water, is the density of hot water, is the radius of the hot water inlet pipe 1651, is the radius of the heating circulating water pipe 1652, is the length of the heating roller 165, is the Reynolds coefficient of hot water, is the Prandtl number of hot water, is the dynamic viscosity of hot water, is the dynamic viscosity of hot water, is the Stefan–Boltzmann constant, is a constant; The calculation module 2 is calculated based on the following formula 2: ; is the maximum power of the water pump 163, is the acceleration due to gravity, is the head of the water pump 163, is the water temperature at the outlet of the water pump 163, is the water temperature at the water inlet end of the water pump 163, The efficiency of the water pump.

[0032] The working principle and beneficial effects of the above technical solution are: Calculate the heat transfer capacity of the heating roller 165 by The maximum power of the water pump 163 during the heat exchange process is calculated. When the real-time power value of the water pump 163 is less than or equal to the maximum power of the water pump 163, the device works normally. When the real-time power value of the water pump 163 is greater than the maximum power of the water pump 163, the control module controls the alarm module to sound an alarm and the device stops running.

[0033] Example 7 The control device based on PLC control is applied to the inspection unit 16 based on PLC control as described above, and is characterized in that the control device includes: an electromagnetic valve 170 is provided at the heating water inlet 1661, and the electromagnetic valve 170 is electrically connected to the PLC system.

[0034] The working principle and beneficial effects of the above technical solution are as follows: the rotary joint 166 fixes the electromagnetic valve 170, and the electromagnetic valve 170 controls the opening and closing of the heating water inlet 1661 of the rotary joint 166. The temperature detection probe 1624 detects the temperature of the rubber material, and the detected temperature is transmitted to the PLC module as an input signal to determine whether it is within the standard requirement range. If it is lower than the standard requirement range, the PLC module transmits a signal to the electromagnetic valve 170, which contains a total of multiple electromagnetic valves 170. The electromagnetic valves 170 are opened one by one in a progressive manner. When one electromagnetic valve 170 is opened, the corresponding electromagnetic valve 170 opening signal is simultaneously reflected during the single opening process. The PLC module is fed and the next solenoid valve 170 is opened in sequence and progressively, and the number of heating rollers 165 that are in action is increased, thereby achieving the control effect of increasing the temperature of the rubber. When the detected temperature is higher than the standard requirement range, the PLC module transmits a signal to the solenoid valve 170, which contains a total of multiple solenoid valves 170. The solenoid valves 170 are closed one by one in a progressive manner. When one solenoid valve 170 is closed, the corresponding solenoid valve 170 closing signal is fed back to the PLC module at the same time during a single closing process, and the next solenoid valve 170 is closed in sequence and progressively, and the number of heating rollers 165 that are opened is reduced, thereby achieving the effect of lowering the temperature of the rubber.

[0035] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Inspection unit based on PLC control, characterized in that: include: A rubber material pretreatment mechanism (1), the rubber material pretreatment mechanism (1) comprising a support frame (12), the top of the support frame (12) being arranged at an angle, a conveyor belt (13), a detection frame (14), and a plurality of fixed frames (15) being arranged on the top of the support frame (12), the detection frame (14) and the fixed frames (15) being arranged side by side, the detection frame (14) being provided with a temperature detection probe (11) for detecting the temperature of the rubber material below, the conveyor belt (13) passing from below the detection frame (14) and between two of the fixed frames (15), an inspection unit (16) being provided between two of the fixed frames (15), and the plurality of inspection units (16), the temperature detection probe (11), and the conveyor belt (13) being electrically connected to a PLC system respectively.

2. The inspection unit based on PLC control according to claim 1 is characterized in that: The inspection unit (16) comprises a support plate (161), the support plate (161) being horizontally arranged in the middle of the support frame (12), a circulating water temperature control mechanism (162) and a water pump (163) being fixedly arranged on the support plate (161), the circulating water temperature control mechanism (162) and the water pump (163) being electrically connected to a PLC system, a water inlet end of the circulating water temperature control mechanism (162) and a water outlet end of the water pump (163) being connected via a hose (164), a heating roller (165) being arranged between two of the fixed frames (15), a rotating joint (166) being respectively arranged at the left and right ends of the heating roller (165), the rotating joint (166) being rotatably arranged in the fixed frames (15) on both sides, and the rotating joints (166) on both sides being arranged at the fixed frames (15) on both sides. The adapter (166) is provided with a heating water inlet (1661) and a heating water outlet (1662), respectively; the heating water inlet (1661) is connected to the water outlet of the circulating water temperature control mechanism (162) via a hose (164); the heating water outlet (1662) is connected to the water inlet of the water pump (163) via a hose (164); a motor (167) is provided on the top of the fixing frame (15) on one side; a spur gear (168) is provided at the driving end of the motor (167) via a coupling; a tooth pattern (169) is provided on the outer surface of the heating roller (165) close to the motor (167); the tooth pattern (169) on the outer surface of the heating roller (165) is meshed with the spur gear (168) for transmission.

3. The PLC-controlled inspection unit according to claim 2, characterized in that: A hot water inlet pipe (1651) is arranged inside the heating roller (165), and the hot water inlet pipe (1651) is horizontally fixedly arranged at the center of the heating roller (165), and the left and right ends of the hot water inlet pipe (1651) are respectively connected to the heating water inlet (1661) and the heating water outlet (1662), and a heating circulating water pipeline (1652) is arranged inside the outer wall of the heating roller (165), and the heating circulating water pipeline (1652) is connected to the hot water inlet pipe (1651).

4. The PLC-controlled inspection unit according to claim 2 is characterized in that: The circulating water temperature control mechanism (162) comprises a liquid storage box (1621), a plurality of fixed blocks (1622) are arranged in the liquid storage box (1621), a heating wire tube (1623) is fixedly arranged in the plurality of fixed blocks (1622), and a second temperature detection probe (1624) is arranged on the inner wall of the liquid storage box (1621).

5. The PLC-controlled inspection unit according to claim 3 is characterized in that: Also includes: Temperature measurement module 1, used to measure the temperature value at the heating water inlet (1661); Temperature measurement module 2, used to measure the temperature value at the heating water outlet (1662); Temperature measurement module three, used to measure the temperature value of water at the outlet end of the water pump (163); Temperature measurement module 4, used to measure the temperature value of water temperature at the water inlet end of the water pump (163); A flow rate detection module, used to detect the real-time flow rate of hot water; A power detection module, used to detect the real-time power value of the water pump (163); An alarm module, used for issuing an alarm; A calculation module 1, used to calculate the heat exchange capacity of the heating roller (165) based on the temperature value at the heating water inlet (1661); A calculation module 2, used for calculating the maximum power of the water pump (163) based on the calculation module 1; A processing module, used for comparing the result obtained by the calculation module 2 with the real-time flow rate of the cooling water; The control module is configured to control the alarm module to sound an alarm and stop the operation of the device when the real-time power value of the water pump (163) is less than or equal to the maximum power of the water pump (163) and when the real-time power value of the water pump (163) is greater than the maximum power of the water pump (163).

6. The PLC-controlled inspection unit according to claim 5, characterized in that: The calculation module 1 calculates based on the following formula 1: ； is the heat transfer capacity of the heating roller (165), is the outer surface area of ​​the heating roller (165), To heat the water temperature at the water inlet (1661), To heat the water temperature at the water outlet (1662), is the volume flow rate of hot water per unit time, is the constant pressure specific heat capacity of hot water, is the density of hot water, is the radius of the hot water inlet pipe (1651), is the radius of the heating circulating water pipe (1652), is the length of the heating roller (165), is the Reynolds coefficient of hot water, is the Prandtl number of hot water, is the dynamic viscosity of hot water, is the dynamic viscosity of hot water, is the Stefan–Boltzmann constant, is a constant; The calculation module 2 is calculated based on the following formula 2: ； is the maximum power of the water pump (163), is the acceleration due to gravity, is the head of the water pump (163), is the water temperature at the outlet of the water pump (163), is the water temperature at the water inlet end of the water pump (163), is the efficiency of the water pump (163).

7. A control device based on PLC control, applied to the inspection unit based on PLC control as claimed in any one of claims 1 to 6, characterized in that: The control device comprises: an electromagnetic valve (170) is arranged at the heating water inlet (1661), and the electromagnetic valve (170) is electrically connected to the PLC system.

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