Twin-screw extruder granulator comprehensive detection system

Abstract

The present invention provides a twin-screw extrusion granulator comprehensive detection system, wherein a dustproof structure is arranged outside a 3D level detection device installed in a silo, a reciprocating trajectory detection mechanism is arranged at a rotating shaft, a displacement detection mechanism is arranged on a gearbox, and a sound insulation structure is arranged outside the gearbox and a motor. In the present invention, the dustproof structure is used to improve the accuracy of the material level detection of the silo, the trajectory detection mechanism is used to improve the stability of the operation of the rotating shaft and the screw, the displacement detection mechanism is used to improve the safety of the gearbox operation, the sound insulation structure is used to reduce the physical harm to the operator, the water cooling jacket is used to improve the service life of the vibration sensor, and the outer shell, the serpentine bending tube and the internal heat exchange tube are used to improve the heat exchange efficiency of the lubricating oil. Through the mutual cooperation of the above structures, the operation of the existing older model twin-screw extrusion granulator is made safer and more stable.

Description

Technical Field

[0001] The invention belongs to the technical field of structural improvement of extrusion granulators, in particular to a comprehensive detection system for a twin-screw extrusion granulator. Background Art

[0002] The twin-screw extruder granulator is the core equipment of the downstream process of the ethylene production process. Its structure is: it includes a pelletizing section 6, a melting pump 7, a mixing section 10, a feeding section 11, a silo 15, a gearbox 19, a motor 20, a cooling unit 22 and a control unit 47. The output shaft of the motor is connected to the input end of the gearbox through a coupling. The two output shafts 121 of the gearbox are respectively connected to the two screws of the mixing section through two rotating shafts 16. The mixed material dropped from the silo enters the mixing section after passing through the feeding section and is melted by high temperature. The molten material enters the pelletizing section through the melting pump. Driven by the motor 4 of the pelletizing section, the particles generated in the pelletizing section are transported away by the conveying unit, and then processed by the drying section and the screening section to obtain the finished particles. The cooling unit is mainly used for cooling the lubricating oil in the gearbox and the motor. A filtering unit 33 and a detection unit 32 are also arranged on the side, and a plurality of beams 35 for support are also arranged in between. The control unit is responsible for receiving various status data and outputting control instructions.

[0003] At present, the company's existing twin-screw extruder granulator is of an older model, and many problems have been found in actual production, specifically:

[0004] 1. The motor and gearbox will vibrate when working, and the high-speed rotation of the rotor driven by the motor will also cause the cylinder to vibrate. With the increase of service time, continuous vibration will cause changes in the working state of the motor and gearbox. Each segment in the cylinder and the connection between the segments will also be affected by the vibration. In order to detect parameters such as the intensity of vibration, multiple vibration sensors will be installed at the motor, gearbox and cylinder. However, due to the high temperature of the motor, gearbox and cylinder, especially the higher temperature of the cylinder at the rear end of the unloading, the existing vibration sensors work at high temperature for a long time, which affects the accuracy of the output data and the service life, which is not conducive to the safe operation of the equipment.

[0005] 2. A 3D level detection device is installed on the silo, which can well detect the surface shape, volume, quality and other conditions of the material in the silo. However, after long-term use, it is found that the dust in the silo will accumulate and adhere to the bottom surface of the transmitting end 67 of the 3D level detection device, which still has a certain impact on the accuracy of the device. Moreover, it is directly installed at the installation position 12 at the upper end of the silo through the flange installed in the middle, and the installation sealing structure also has defects.

[0006] 3. Chinese patent CN204773519U discloses a detection device for a twin-screw extrusion granulator, which is equipped with a displacement detection device for detecting the horizontal and vertical displacement of the screw at the end of the screw, and uses a sensor to detect the working state of the screw at all times to determine whether there is collision or friction. In the above patent, since the sensor is fixed on the inner wall of the protective shell, the measurement position is relatively fixed, but the length of the screw is relatively long, so the alarm can only be triggered when the screw deviates seriously, and the deviation problem at both ends of the screw cannot be detected. In addition, from the actual fault situation, it can be seen that the rotating shaft also has problems such as displacement and deviation due to long-term high-speed rotation, but the above solution cannot solve this problem.

[0007] 4. A horizontally placed long cylindrical water-cooling jacket is used in the cooling unit, that is, the oil pipe passes through the water-cooling jacket. When the cold water passes through the water-cooling jacket, it exchanges heat with the lubricating oil in the oil pipe, so that the lubricating oil is reduced to a suitable temperature before being filtered and then returned to the gearbox. Due to the limited length of the water-cooling jacket and the limited amount of cold water it can contain, the temperature of the lubricating oil in the oil pipe can only be fully reduced through continuous flow, resulting in a waste of energy during long-term operation of the water pump; when too much scale appears in the water-cooling jacket, it will further reduce the water capacity in the water-cooling jacket and affect the flow rate of the cold water, and the cooling effect will continue to decline, which is not conducive to the cooling of the lubricating oil.

[0008] 5. The gearbox and the motor and pelletizing section motor connected to it are all in high-speed rotation. Each motor has a large power, and the gearbox is equipped with a gear speed change mechanism. Therefore, the sound of the motor, gear, shaft and vibration will spread to the production environment. The noise around the granulator exceeds 90 decibels, and even exceeds 100 decibels near the motor, gearbox or transmission. Operators need to patrol the site regularly to observe the working status of the machine and the status of various instruments at the cooling unit. Since the granulator line is long, each walk, resident observation, instrument observation, etc. takes several minutes. The huge noise causes discomfort to the operators. In addition, in order to meet the needs of safe production, operators need to wear protective equipment such as safety helmets and goggles at the production site. The inability to wear noise protection equipment has a great impact on the health and work efficiency of the operators.

[0009] 6. There are multiple gears inside the gearbox. Through the meshing of different gears, the purpose of single-axis input and dual-axis output is achieved. However, the vibration generated by the high-speed rotation of the motor and the vibration generated by the gearbox itself will affect the operation of the gearbox. Once the rotating shaft during dual-axis output is offset, it will inevitably affect the subsequent operation stability of the screw. The existing on-site detection method relies on the experience of the inspection personnel, who judge the working condition of the gearbox by looking, listening, and touching.

[0010] In summary, the problems existing in the existing twin-screw extruder granulator are very detrimental to safe production, and after searching patents and other public documents, no device, equipment or system for comprehensively dealing with the above problems has been found. Summary of the invention

[0011] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a twin-screw extrusion granulator comprehensive detection system, which is provided with a dustproof structure on the outside of a 3D level detection device installed in a silo, a trajectory detection mechanism that can move back and forth on the rotating shaft, a displacement detection mechanism on the gearbox, and a sound insulation structure on the outside of the gearbox and the motor.

[0012] The technical solution adopted by the present invention is:

[0013] A comprehensive detection system for a twin-screw extrusion granulator comprises a pelletizing section, a melting pump, a mixing section, a feeding section, a silo, a gearbox, a motor, a cooling unit and a control unit, wherein the motor is connected to one end of the gearbox, the gearbox is connected to a rotating shaft at one end of the feeding section, a silo is arranged on the upper end surface of the feeding section, and the other end of the feeding section is sequentially connected to the mixing section, the melting pump and the pelletizing section, and is characterized in that: a dustproof structure is arranged outside a 3D level detection device installed in the silo, a reciprocating trajectory detection mechanism is arranged at the rotating shaft, a displacement detection mechanism is arranged on the gearbox, and a sound insulation structure is arranged outside the gearbox and the motor.

[0014] Furthermore, the dust-proof structure is: a mounting tube with an upper end opening and a lower end extending into the silo is provided at the mounting position at the upper end of the silo, the 3D level detection device is embedded in the mounting tube, the emitting end of the bottom surface of the 3D level detection device is aligned with the window provided on the bottom surface of the mounting tube, a sealing cover that can be sealed with the upper end of the mounting tube is provided at the outer edge of the 3D level detection device, an air inlet is provided at the upper end of the mounting tube, the air inlet passes through the upper end of the sealing cover to be connected to the air source, the lower end of the air inlet is communicated with a nozzle provided on the bottom surface of the side wall of the mounting tube through a channel in the side wall of the mounting tube, and the air outlet of the nozzle faces the surface of the window.

[0015] Furthermore, the trajectory detection mechanism is: three electric push rods are arranged on the upper end face, the front end face and the rear end face of the feeding section, the moving ends of the three electric push rods are all facing the gearbox, the moving ends of the two electric push rods located at the front end face and the rear end face are each provided with a side eddy current sensor close to the side of the rotating shaft on the same side, and the moving end of the electric push rod located at the upper end face is provided with a bracket, and the lower ends of both sides of the bracket are provided with upper eddy current sensors close to the rotating shaft on the same side;

[0016] The moving ends of the two electric push rods located at the front end face and the rear end face can stay at different side positions of the rotating shaft during the process of moving toward the gearbox direction or the feeding section direction and be detected by the side eddy current sensors; the electric push rod located at the upper end face can stay at different upper end face positions of the rotating shaft during the process of moving toward the gearbox direction or the feeding section direction and be detected by the two upper eddy current sensors respectively.

[0017] Furthermore, the bracket includes a cross bar, a vertical bar and a mounting plate. The cross bar is connected to the moving end of the electric push rod on the same side through a fixed seat. The two ends of the cross bar are respectively connected to a vertical bar. The lower end of each vertical bar is respectively installed with a mounting plate extending above the upper end surface of the rotating shaft on the same side. Each mounting plate is located above the upper end surface of the rotating shaft on the same side and an upper eddy current sensor is embedded in the position. The measuring end of each upper eddy current sensor faces the upper end surface of the rotating shaft on the same side.

[0018] Furthermore, the displacement detection mechanism is: at least two eddy current sensors are embedded in the upper end plate of the gearbox, the measuring ends of the two eddy current sensors extend into the gearbox and are respectively close to the end faces of the driving gears that are mounted on the outer edges of the two output shafts in the gearbox, a vibration sensor is respectively installed at the four corners of the upper end plate, and a vibration sensor is respectively installed under the side walls of the front and rear ends of the gearbox.

[0019] Furthermore, the sound insulation structure is: sound insulation side panels are arranged on the ground at the front end, rear end and both sides of the rotating shaft, gearbox and motor of the feeding section, sound insulation top panels are arranged at the upper ends of the four sound insulation side panels, observation windows for observing the rotating shaft of the feeding section and observation windows for observing the gearbox and motor are arranged on the sound insulation side panels, and a valve is arranged on any one of the sound insulation side panels, and gaps are reserved between the rotating shaft of the feeding section, the gearbox and the motor and the sound insulation side panels and the sound insulation top panels;

[0020] Sound insulation side panels are arranged on the ground at the front end, rear end and both sides of the pelletizing section, a sound insulation top panel is arranged at the upper ends of the four sound insulation side panels, an observation window for observing the pelletizing section is arranged on the sound insulation side panels, a valve is arranged on any one of the sound insulation side panels, and a gap is reserved between the pelletizing section and the sound insulation side panels and the sound insulation top panel.

[0021] Furthermore, the structure of the sound insulation side panel includes an outer plastic steel plate, an inner plastic steel plate, sound absorbing cotton, sound insulation felt and gypsum board, sound absorbing cotton is embedded between the outer plastic steel plate and the inner plastic steel plate, sound insulation felt is attached to the inner surface of the inner plastic steel plate, and gypsum board is attached to the inner surface of the sound insulation felt;

[0022] The structure of the soundproof top plate includes an outer plastic steel plate, an inner plastic steel plate, sound-absorbing cotton, sound insulation felt and gypsum board, the sound-absorbing cotton is embedded between the outer plastic steel plate and the inner plastic steel plate, the sound insulation felt is attached to the inner surface of the inner plastic steel plate, and the gypsum board is attached to the inner surface of the sound insulation felt;

[0023] The structure of the valve comprises an outer plastic steel plate, an inner plastic steel plate, sound-absorbing cotton, sound-proof felt and gypsum board, the sound-absorbing cotton is embedded between the outer plastic steel plate and the inner plastic steel plate, the sound-proof felt is attached to the inner surface of the inner plastic steel plate, and the gypsum board is attached to the inner surface of the sound-proof felt;

[0024] The observation window uses a three-layer glass structure, and there is a vacuum state between two adjacent layers of glass.

[0025] Furthermore, at least one vibration sensor is arranged on the surface of the connecting plate between the mixing section and the melt pump, a water cooling jacket is attached to the outer edge of the vibration sensor, a layer of thermal conductive graphite film is embedded between the water cooling jacket and the vibration sensor, and a temperature sensor for detecting the temperature value of the outer edge of the vibration sensor is arranged on the inner edge of the water cooling jacket. The water cooling jacket is composed of two arc-shaped jackets, which are symmetrically buckled on the outer edge of the vibration sensor and fastened together by fixing bolts on the fixing plates arranged at both ends of the water cooling jacket.

[0026] Furthermore, the outer shape of the shell of the cooling unit is square or rectangular, an oil inlet is arranged on the right side of the bottom surface of the shell, an oil outlet is arranged on the left side of the upper end surface of the shell, the oil inlet and the oil outlet are connected to each other through a serpentine bending pipe arranged in the shell, a water outlet is arranged beside the oil inlet, a water inlet is arranged beside the oil outlet, and a temperature sensor is embedded in the side wall of the oil outlet;

[0027] A water inlet branch is connected on the side wall of the water inlet, and a water outlet branch is connected on the side wall of the water outlet. The water inlet branch is connected to the upper end of the inner heat exchange tube set in the serpentine bending tube, and the lower end of the inner heat exchange tube is connected to the water outlet branch. The outer edge of the inner heat exchange tube is spaced from the inner edge of the serpentine bending tube.

[0028] Furthermore, the ends of two adjacent oil pipes in the vertical direction of the serpentine bending pipe are connected through an elbow cover, the upper end and the lower end of the elbow cover are respectively connected to the two oil pipes, and the opening of the elbow cover between the two oil pipes is closed by a baffle;

[0029] The upper end surface and the bottom surface of the elbow cover are both semicircular corresponding to the upper end and the lower end of the oil pipe, and the bottom surface of the oil pipe located at the upper end of the elbow cover and the upper end surface of the oil pipe located at the lower end of the elbow cover are respectively in contact with the arc-shaped surfaces formed at the upper end and the lower end of the baffle;

[0030] The oil pipe is embedded in the straight pipe section of the inner heat exchange pipe, and the elbow cover is embedded in the arc-shaped connecting section of the inner heat exchange pipe.

[0031] The advantages and positive effects of the present invention are:

[0032] 1. In this system, the sealing cover and the sealing connection structure thereon ensure that external pollutants will not affect the normal operation of the transmitting end. One end of the air inlet arranged on the mounting tube is connected to the gas source through a quick-release joint and an air pipe, and the other end is connected to the nozzle arranged on the bottom surface of the side wall of the mounting tube through a channel in the mounting tube. The high-pressure gas output by the gas source is regularly ejected through the air outlet of the nozzle to blow away a small amount of dust adhering to the window surface, thereby ensuring the detection accuracy of the 3D level detection device and improving the overall sealing of the 3D level detection device.

[0033] 2. In this system, the two eddy current sensors can cooperate with each other to detect the displacement variables of the rotating shaft from time to time. The detection results are then processed by the control unit and can be analyzed, stored and displayed. Through the pre-set alarm value, the control unit can automatically alarm after receiving the detection results. The control unit can also automatically draw a motion state diagram of the rotating shaft and display the detection results at the same time. The monitoring personnel can intuitively understand whether the rotating shaft is in an abnormal state, and respond in time to perform maintenance when a fault occurs, which is conducive to the safe operation of the equipment.

[0034] 3. In this system, the output end of each eddy current sensor and the output end of the vibration sensor at the gearbox are connected to the control unit. The eddy current sensor is mainly used to detect the change in the size of the gap between the end face of the driving gear and it, and the vibration sensor is mainly used to detect the vibration conditions of various parts of the gearbox. The control unit receives the gap change data and vibration data and then analyzes and judges them, and compares them with the preset values. When an alarm is required, the control unit actively sends an alarm message to the sound and light unit and the host computer. Through the cooperation of the above structures, the recording and analysis of the movement state of the driving gear is realized, thereby discovering problems such as output shaft offset in advance and ensuring the stable operation of the gearbox.

[0035] 4. In this system, the sides and top of the gearbox and motor are isolated by sound insulation side panels and sound insulation top panels, and the sides and top of the pelletizing section are also isolated by sound insulation side panels and sound insulation top panels. The noise is absorbed and isolated from the inside to the outside by gypsum boards, sound insulation felts, plastic steel plates and sound-absorbing cotton. The noise transmitted to the outside has been greatly reduced, which greatly reduces the risk of hearing damage to operators. In addition, operators can observe the working status of the equipment and obtain instrument readings through the observation window without affecting normal patrol inspection work.

[0036] 5. In this system, a thermal conductive graphite film is attached to the outer edge of the vibration sensor, a water cooling jacket is attached to the outer edge of the thermal conductive graphite film, and a temperature sensor is arranged on the inner edge of the water cooling jacket. The temperature sensor detects the temperature value of the outer edge of the vibration sensor at all times and transmits it to the control module. The control unit controls the opening or closing of the electric control valve group and the water pump according to the preset temperature threshold, thereby forming a feedback control method, which can effectively reduce the temperature of the vibration sensor through the controlled circulation of water, ensure its normal operation, and improve the safety of equipment operation.

[0037] 6. In the present system, the outer shell of the cooling unit is preferably rectangular. When the hot lubricating oil in the serpentine bending tube exchanges heat with the cold water in the water cooling jacket, it also exchanges heat with the cold water flowing in the inner heat exchange tube. A temperature sensor is provided at the oil outlet to detect the temperature of the lubricating oil at the oil outlet. When the temperature exceeds the set alarm value, the control unit automatically drives the water pump to increase the flow rate of the cold water to meet the need for rapid cooling. The heat exchange efficiency is higher through simultaneous heat exchange on the outside and inside and detection by the temperature sensor. The water pump does not need to work at full load frequently, which reduces energy consumption. The fully heated water can also be used in other process sections in the production line.

[0038] 7. In the present invention, a dustproof structure is used to improve the accuracy of material level detection in the silo, a trajectory detection mechanism is used to improve the stability of the operation of the rotating shaft and the screw, a displacement detection mechanism is used to improve the safety of the gearbox operation, a sound insulation structure is used to reduce the physical harm to the operator, a water cooling jacket is used to increase the service life of the vibration sensor, and an outer shell, a serpentine bending tube and an internal heat exchange tube are used to improve the heat exchange efficiency of the lubricating oil. Through the mutual cooperation of the above-mentioned structures, the operation of the existing older model twin-screw extrusion granulator is made safer and more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of the present invention;

[0040] Figure 2 yes Figure 1 Schematic diagram of removing the sound insulation structure;

[0041] Figure 3 yes Figure 2 A magnified view of part I;

[0042] Figure 4 yes Figure 2 A partial cross-sectional view of

[0043] Figure 5 It is an enlarged schematic diagram of the 3D level detection device at the installation position;

[0044] Figure 6 yes Figure 5 A magnified view of Part II;

[0045] Figure 7 yes Figure 5 A magnified view of Part III;

[0046] Figure 8 This is a partial enlarged view of the cooperation between the electric push rod and the rotating shaft;

[0047] Fig. 9 yes Figure 8 A top view of

[0048] Fig.10 yes Figure 8 A magnified view of part IV;

[0049] Fig.11 is an enlarged cross-sectional view of the cooling unit housing;

[0050] Fig.12 yes Fig.11 The enlarged view of the V part;

[0051] Fig.13 yes Fig.11 A magnified view of part VI;

[0052] Fig.14 yes Fig.12 Right view of;

[0053] Fig.15 yes Fig.13 sectional view of;

[0054] Fig.16 yes Fig.15 Right view of;

[0055] Fig.17 is a schematic diagram of the baffle;

[0056] Fig.18 yes Figure 1 A-direction view;

[0057] Fig.19 yes Fig.18 VII enlarged view;

[0058] Fig. 20 yes Figure 1 B-direction view;

[0059] Fig.21 is a cross-sectional view of the sound insulation side panel;

[0060] Fig. 22 is a cross-sectional view of the observation window;

[0061] Fig.23 It is a schematic diagram of the gearbox;

[0062] Fig.24 yes Fig.23An enlarged view of Part VIII. DETAILED DESCRIPTION

[0063] The present invention is further described below in conjunction with examples. The following examples are illustrative rather than restrictive, and the protection scope of the present invention cannot be limited by the following examples.

[0064] A comprehensive detection system for twin-screw extruder granulator, such as Figures 1 to 24 As shown, it includes a pelletizing section 6, a melt pump 7, a mixing section 10, a feeding section 11, a silo 15, a gearbox 19, a motor 20, a cooling unit 22 and a control unit 47. The motor is connected to one end of the gearbox through a coupling 31, and the gearbox is connected to the rotating shaft 16 at one end of the feeding section. The upper end surface of the feeding section is connected to the lower end 34 of the silo, and the other end of the feeding section is connected to the mixing section, the melt pump and the pelletizing section in sequence. The innovation of the present invention lies in: a dustproof structure is arranged outside the 3D level detection device 13 installed in the silo, a trajectory detection mechanism that can move back and forth is arranged at the rotating shaft, a displacement detection mechanism is arranged on the gearbox, and a sound insulation structure is arranged on the outside of the gearbox and the motor.

[0065] In this embodiment, the dustproof structure is as follows: Figure 5 , 6 , 7: a mounting tube 66 with an upper end opening and a lower end extending into the silo is provided at the mounting position 12 of the upper end 14 of the silo, the mounting tube is fixedly connected to the silo panel 65 at the mounting position through a flange 57 at the outer edge, a sealing gasket or a sealing ring can be embedded between the flange and the panel, a 3D level detection device is embedded in the mounting tube, a transmitting end 67 on the bottom surface of the 3D level detection device is aligned with a window 70 provided on the bottom surface of the mounting tube, and a sealing cover 61 that can be sealingly connected to the upper end of the mounting tube is provided at the outer edge of the 3D level detection device.

[0066] An air inlet 58 is arranged at the upper end of the mounting tube, and the air inlet passes through the upper end of the sealing cover from the sealing cover opening 76 and is connected to a high-pressure air source through a quick-release joint 74, an air pipe, a valve, etc. The lower end of the air inlet is connected to a nozzle 72 arranged on the bottom surface 73 of the side wall of the mounting tube through a channel 77 in the side wall of the mounting tube, and the air outlet 71 of the nozzle faces the surface of the viewing window.

[0067] In order to further connect the sealing cover and the mounting tube together, the outer edge of the upper end of the air inlet has an external thread and is engaged with a locking nut 75. The bottom surface of the locking nut is crimped together with the upper end surface of the sealing cover, and a sealing gasket or sealing ring can be embedded between the locking nut and the upper end surface of the sealing cover.

[0068] There can be multiple air inlets, and the nozzles matched therewith can also be set in the same number, for example: there can be 1 to 4 air inlets, and the nozzles can also be set in the same number, no matter how many there are, the air outlet of each nozzle is facing the window surface. The preferred solution is that there are two air inlets and two nozzles, and the angle between the two nozzles at the bottom surface of the side wall of the installation tube is 60 to 120 degrees, so that the high-speed airflow ejected by the two nozzles can better blow away the dust adhering to the window surface.

[0069] The structure of the sealing cover is: the sealing cover is sleeved on the outer edge of the lower end 56 of the gauge head 55 on the upper end surface of the housing 60 of the 3D level detection device, and two retaining rings 64 extending downward and coaxial with the sealing cover are arranged on the bottom surface of the sealing cover, and the upper end 63 of the installation tube is embedded in the gap between the two retaining rings. A more preferred solution is: a sealing ring 62 with a groove is embedded between the two retaining rings, and the sealing ring can be made of corrosion-resistant rubber material, and the upper end of the installation tube is embedded in the groove.

[0070] A fixing bolt 59 is arranged on the sealing cover, and the lower end of the fixing bolt is connected to the upper end surface of the housing of the 3D level detection device and connects the sealing cover to the housing.

[0071] The above-mentioned window is made of highly light-transmitting glass material with a thickness of 2 to 10 mm. A fixing ring 69 is bonded to the outer edge of the upper end surface of the window. The outer edge of the fixing ring is bonded to the inner edge of the lower end 68 of the mounting tube. The fixing ring can be made of plastic material. When the window becomes blurred due to wear or other reasons, the fixing ring and the window can be removed by external force, and then a new window can be bonded.

[0072] The meter head of the 3D level detection device is connected to the host computer of the control center through cables or wirelessly. The transmitter sends pulses to the material, and then receives echoes from the silo, material, etc. The host computer then samples and analyzes them to form a three-dimensional map of the material surface, so that the various states in the silo are intuitively displayed on the host computer screen.

[0073] The high-pressure gas source can be the high-pressure gas in the gas cylinder of the compressor at the production site, the valve can be an electric control valve, and the gas pipe is preferably made of seamless steel pipe.

[0074] The above-mentioned trajectory detection mechanism is as follows Figure 8 , 9As shown in 10: three electric push rods 26 and 27 are arranged on the upper end face, front end face and rear end face of the feed section, and the moving ends 28 of the three electric push rods are all facing the gearbox, and the moving ends of the two electric push rods 27 located at the front end face and the rear end face are each provided with a side eddy current sensor 86 close to the side face of the rotating shaft on the same side, and the moving end of the electric push rod 26 located at the upper end face is provided with a bracket, and the lower ends of both sides of the bracket are provided with upper eddy current sensors 87 close to the upper end face of the rotating shaft on the same side, and the output ends of the upper eddy current sensor and the side eddy current sensor are connected to the control unit.

[0075] The moving ends of the two electric push rods located at the front and rear faces can stay at different side positions of the rotating shaft during the process of moving toward the gearbox or the feeding section and be detected by the side eddy current sensors. The electric push rod located at the upper end face can stay at different upper end face positions of the rotating shaft during the process of moving toward the gearbox or the feeding section and be detected by the two upper eddy current sensors respectively.

[0076] The movement of the three electric push rods is controlled by the control unit. The electric push rods have detection sensors for the two limit positions of retraction and extension, or have a rotary encoder for detecting the driving motor 80 thereof. In short, the electric push rods can output the state data of their limit positions of retraction or extension. The control unit outputs instructions to make the moving end of the electric push rods continuously retract or extend, and stop at the end, middle or end of the output shaft close to the gearbox. At the moment of stopping, the eddy current sensor measures, thereby realizing the detection of different positions of the output shaft. Of course, it can also stop at more positions to improve the accuracy of the output shaft motion trajectory analysis.

[0077] The side eddy current sensor is embedded in a mounting plate 85, which is connected to the moving end of the electric push rod on the same side, and the measuring end of the side eddy current sensor faces the side of the rotating shaft on the same side. The shape of the mounting plate here can be round, square or long strip, preferably square as shown in the figure, which is convenient for connection with the moving end and does not occupy too much area.

[0078] The bracket includes a crossbar 88, a vertical bar 29 and a mounting plate 85. The crossbar is connected to the moving end of the electric push rod on the same side through a fixed seat 83. The two ends of the crossbar are respectively connected to a vertical bar. The lower end of each vertical bar is respectively installed with a mounting plate extending above the upper end surface of the rotating shaft on the same side. Each mounting plate is located above the upper end surface of the rotating shaft on the same side and is embedded with an upper eddy current sensor. The measuring end of each upper eddy current sensor faces the upper end surface of the rotating shaft on the same side. The mounting plate at this location is long and narrow, and the two ends of the crossbar are wider than the equipment panel 30 at this location. The vertical bar extends downward, and the long strip mounting plate at the lower end extends from the gap between the equipment panel and the rotating shaft. The spacing between the two upper eddy current sensors and the upper end surface of the rotating shaft is the same, and the two upper eddy current sensors are respectively in the same vertical position with the side eddy current sensor on the same side, so that the two side eddy current sensors can form a matching measurement relationship with the upper eddy current sensor on the same side.

[0079] In order to make the vertical rod have the function of fine adjustment, the upper end of the vertical rod is fixed to the cross bar by bolts 84. When it is necessary to fine-tune the upper eddy current sensor, the bolts can be loosened to make the vertical rod swing, and after adjustment, the bolts can be tightened.

[0080] The rear end of the electric push rod is connected to the outer wall of the feed section through the rear base 78 installed thereon, and the outer wall at the moving end of the electric push rod is sleeved with a fixing seat 81, which is connected to the outer wall of the feed section and the connecting plate 82 of the panel. A shock-absorbing pad 79 can be placed between the rear base or the fixing seat and the outer wall of the feed section to improve the detection accuracy of the eddy current sensor and increase the service life of the electric push rod.

[0081] After on-site data analysis, it is found that most of the time, the displacement or deviation of the screw is caused by problems in the output shaft position. This is because the rotating shaft has a certain length, and the screw also has a certain length. When the output shaft is slightly displaced or deviated, it will cause a larger displacement or deviation at the screw. Therefore, detecting the displacement or deviation of the rotating shaft can better improve the safety of the screw operation.

[0082] The control unit can receive the output of the eddy current sensor and control the movement of the electric push rod, such as: including cables, acquisition cards, central control modules and other common circuit components, which are not described in detail here.

[0083] The above displacement detection mechanism is as follows Fig.23 , 24 As shown: at least two eddy current sensors 123 are embedded in the upper end plate 125 of the gearbox, and the measuring ends 137 of the two eddy current sensors extend into the gearbox and are respectively close to the end faces of the driving gears 124 which are mounted on the outer edges of the two output shafts 121 in the gearbox, and the output ends of the two eddy current sensors are connected to the control unit.

[0084] A vibration sensor 122 is installed at each of the four corners of the upper end plate, and a vibration sensor is installed under the side wall at the front and rear ends of the gearbox, respectively. The output end of the vibration sensor is connected to the control unit. Of course, it is also possible to install vibration sensors on the side walls on both sides of the gearbox, but only six vibration sensors are needed for actual detection.

[0085] A through hole 138 is formed at the position where the upper end plate is opposite to the driving gear inside the gearbox. The through hole is located on the upper end plate beside the driving gear. A base 131 is installed on the upper end plate above the through hole. The middle outer edge 130 of the eddy current sensor is meshed and connected inside the base. The lower end of the eddy current sensor extends into the gearbox and is opposite to the end face of the driving gear.

[0086] The measuring end of the eddy current sensor faces the end face of the driving gear. When the gap between the end face of the driving gear and the measuring end is too large or too small, it means that the driving gear has problems such as offset, which also means that the output shaft has this problem. At this time, the machine needs to be shut down for inspection to find the cause of the offset.

[0087] The outer edge of the upper end of the base is meshed and sleeved on the inner edge 132 of the water cooling cover 126. The lower end surface 135 of the water cooling cover is pressed against the base bottom 140 extending outward from the lower end of the base. An opening 128 is made on the upper end of the water cooling cover. The upper end 127 of the eddy current sensor extends from the opening. The inner surface of the water cooling cover beside the opening is pressed against the upper end surface of the clamping ring 129 sleeved on the outer edge of the eddy current sensor. The outer edge of the bottom surface of the clamping ring is pressed against the upper end surface of the base. A water inlet 141 is set at the lower end of one side of the water cooling cover, and a water outlet 133 is set at the upper end of the other side, so that cold water enters from the bottom and hot water flows out from the top. The heat of the eddy current sensor is taken away by the flow of water to avoid the problem of over-temperature.

[0088] The base is fixed to the upper end plate of the gearbox by bolts, and a sealing gasket 136 is embedded between the bottom surface of the base and the upper end surface of the upper end plate. The protrusion 134 formed on the sealing gasket fills the gap 139 between the eddy current sensor and the base.

[0089] The above-mentioned sound insulation structure is as follows Figure 1 , 18 As shown in ~22: Figure 1 As shown, sound insulation side panels 5 are arranged on the ground at the front end, rear end and both sides of the feeding section rotating shaft 16, the gearbox and the motor, a sound insulation top panel 111 is arranged on the upper ends of the four sound insulation side panels, an observation window 17 for observing the feeding section rotating shaft and an observation window for observing the gearbox and the motor are arranged on the sound insulation side panels, a valve 21 is arranged on any one of the sound insulation side panels, and gaps are reserved between the feeding section rotating shaft, the gearbox and the motor and the sound insulation side panels and the sound insulation top panel.

[0090] The vertical beam 1, the horizontal beam 2 and the middle beam 18 cooperate with each other to build a frame structure, and the side panels are installed with sound insulation, and the top panel is installed with sound insulation. Figure 1 The right side of the rotating shaft, gearbox and motor are closed, and the vertical beams and cross beams can be made of thicker steel materials, such as 1 cm thick angle steel. The thicker materials are mainly used for support stability. The sound insulation side panels and the sound insulation top panels can be fixed to each other with common connection structures such as connectors and bolts, and remain stable under the vibration environment of the gearbox and motor. Two observation windows are set on each sound insulation side panel at the front and rear ends. This is because the overall length of the rotating shaft, gearbox and motor is long, so more observation windows are set to facilitate operators to observe the working status of the equipment, so the valve is set on the sound insulation side panel on the far right.

[0091] Since the feed section passes through the leftmost sound insulation side panel, a rectangular opening is made on the leftmost sound insulation side panel. The state of the rectangular opening can be seen in Fig.18 The inner edge of the rectangular opening and the outer edge of the feeding section may fit together, or a certain gap may be retained. Of course, if a gap is provided, the smaller the gap, the better, so as to reduce the noise transmitted from this place.

[0092] like Figure 1 As shown on the left side, soundproof side panels 5 are arranged on the ground at the front end, rear end and both sides of the pelletizing section, a soundproof top panel 111 is arranged on the upper ends of the four soundproof side panels, an observation window 3 for observing the pelletizing section is arranged on the soundproof side panels, a valve 21 is arranged on any one of the soundproof side panels, and a gap is reserved between the pelletizing section and the soundproof side panels and the soundproof top panel. The difference between this place and the rightmost side is that the overall horizontal length of this place is slightly shorter, so only the coordination of vertical beams and horizontal beams is used for construction, and no middle beam is used. The other structures are the same as the rightmost side. Two observation windows are respectively arranged on the two soundproof side panels at the front end and the rear end, so that the operator can see the motor 4 and the transmission 37 of the pelletizing section 6. Since the connection between the pelletizing section and the melting pump 7 passes through the soundproof side panel on the right, as shown in FIG. Fig.18 As shown, the circular hole 110 just passes through the above-mentioned connection. Like the rectangular opening on the far right, preferably no gap is left between the circular opening and the outer edge of the connection between the pelletizing section and the melt pump.

[0093] The lower end of the sound insulation side plate is fixed in the fixing groove 24, and the lower end of the fixing groove is embedded in the upper end surface of the concrete base 23. An air inlet 25 is provided on the concrete base, and an exhaust port 112 is provided on the sound insulation top plate. The fixing groove is also made of bent steel material with a thickness of about 1 cm. Fig.19As shown, its structure is that the air inlet is connected to the outside and the inside of the base, and the end near the outside is provided with a downwardly inclined baffle, and the exhaust port can be of any shape and can be provided in plurality, and an exhaust fan can be installed for active exhaust, or it can be connected to the dust removal and exhaust device of the workshop through a connecting pipe to complete the active exhaust. Of course, it is also possible to directly keep the exhaust port in an open state. The coordination process with the air inlet is: since the sound insulation side panels, the sound insulation top panels, etc. seal the gearbox and the motor, after the equipment is heated, the internal air flows out of the exhaust port, and the surrounding cold air enters the sound insulation side panels and the sound insulation top panel from the air inlet, and begins to be heated again, and circulates continuously to make the air flow, thereby avoiding overheating of the internal equipment.

[0094] The above-mentioned exhaust port has the problem of noise leakage, and the gap between the above-mentioned feeding section and pelletizing section and the sound insulation side plate on the same side also has the problem of noise leakage. However, in actual work, it is not required to reduce the noise as much as possible, but only to isolate the larger noise and make the leaked noise tolerable to the human ear for a long time without causing damage to the human ear.

[0095] The structure of the sound insulation side panel is as follows Fig.21 As shown: it includes an outer plastic steel plate 117, an inner plastic steel plate 115, sound-absorbing cotton 116, sound insulation felt 114 and gypsum board 113. Sound-absorbing cotton is embedded between the outer plastic steel plate and the inner plastic steel plate, and the inner surface of the inner plastic steel plate is attached with sound insulation felt, and the inner surface of the sound insulation felt is attached with gypsum board. The layered structure of the sound insulation top plate and the layered structure of the valve are the same as those of the sound insulation side plate. The outer plastic steel plate is composed of multiple layers, with a total thickness of 0.4 to 0.7 cm, and the inner plastic steel plate is the same as the outer plastic steel plate. The thickness of the sound-absorbing cotton is 3 to 5 cm, the thickness of the sound insulation felt is 2 to 3 cm, and the thickness of the gypsum board is 0.7 to 1 cm.

[0096] Sound insulation felt is a high-density roll material with a certain degree of flexibility. It can better achieve sound insulation when combined with gypsum board. Sound-absorbing cotton is a man-made inorganic fiber. It uses natural minerals such as quartz sand, limestone, dolomite, etc. as the main raw materials, and is melted into glass with some chemical raw materials such as soda ash and borax. In the molten state, it is blown into floc-like fine fibers with the help of external force. The fibers are three-dimensionally crossed and entangled with each other, presenting many small gaps.

[0097] In order to facilitate operators to observe the working status of the equipment, the observation window is Fig. 22 The triple-layer glass structure 120 is shown, and there is a vacuum state 119 between two adjacent layers of glass. Both ends of the triple-layer glass structure are embedded in profiles and fire-resistant glue 118 is injected inside, and then embedded in the sound insulation side panels.

[0098] In addition to the above structures, there are the following improvements, specifically:

[0099] The fifth improvement is that at least one vibration sensor 8 is arranged on the surface of the connecting plate 36 between the mixing section and the melt pump, and a water cooling jacket 9 is attached to the outer edge of the vibration sensor. Cooling water 51 flows in the water cooling jacket. The water inlet 45 arranged at the lower end of the water cooling jacket is connected to the water source through the electric control valve group 49 and the water pump 50. The water outlet 38 arranged at the upper end of the water cooling jacket is used to discharge the water that absorbs heat.

[0100] The upper end of the vibration sensor is connected to a cable 52, the lower end of the vibration sensor is fixed to the surface of the connection plate through a base, and a water cooling jacket is attached to the outer edge of the vibration sensor above the base. A temperature sensor 54 for detecting the temperature value of the outer edge of the vibration sensor is arranged on the inner edge of the water cooling jacket, and the output end of the temperature sensor is connected to a control unit, and the control unit is connected to the control end of the electric control valve group and the control end of the water pump.

[0101] The temperature sensor uses a platinum resistor as a temperature measuring element, and converts the measured temperature value through the change of its resistance value. The control module uses an industrial control processor as the core, which completes the reception of detection data and the output of control instructions.

[0102] The water cooling jacket is composed of two arc-shaped jackets 41, each of which is greater than the height of the vibration sensor, and a fixing plate 42 is provided at both ends, and the openings formed on the fixing plates have internal threads. When in use, the two arc-shaped jackets are symmetrically buckled on the outer edge of the vibration sensor, and then the fixing bolts 43 are screwed into the openings of the mutually aligned fixing plates, thereby fastening the two arc-shaped jackets to each other, and the nuts 44 can also be engaged at the ends of the fixing bolts to make the connection tighter.

[0103] Each arc sleeve is provided with a water inlet 45 at the lower end, and a water outlet 38 at the upper end of each arc sleeve, and the water inlet and the water outlet are respectively located on both sides of the arc sleeve. The water inlets of the two arc sleeves are connected to the water inlet pipe 46 through a three-way pipe 39, and an electric control valve group and a water pump are arranged on the water inlet pipe, and the water outlets of the two arc sleeves are connected to the water outlet pipe 40 through another three-way pipe.

[0104] The electric control valve group has multiple electric control valves, and the specific number is determined by the number of vibration sensors, that is, if several vibration sensors are set at the motor, gearbox and mixing section, the electric control valves set in the electric control valve group are set with the same number and are connected to the water cooling jackets at other vibration sensors through other water inlet pipes 48, and the water outlet of the water pump is respectively connected to the multiple electric control valves, and the water inlet of the water pump is connected to the water source.

[0105] In order to improve the full contact between the inner edge of the water cooling jacket and the outer edge of the vibration sensor, a layer of thermal conductive graphite film 53 is embedded between the water cooling jacket and the vibration sensor, with a thickness of 0.5 to 1.5 mm, a density of 1.5 to 18 g / cm, and a thermal conductivity of about 1000 w / (mk). The tighter the water cooling jacket fits, the higher the heat transfer efficiency of the thermal conductive graphite film and the better the heat dissipation effect.

[0106] The sixth improvement is Figures 11 to 17 As shown: the surface 99 of the shell 95 of the cooling unit is provided with a water inlet 89 and a water outlet 100, the outer shape of the shell is square or rectangular, an oil inlet 101 is provided on the right side of the bottom surface of the shell, and an oil outlet 92 is provided on the left side of the upper end surface of the shell. The oil inlet and the oil outlet are connected to each other through a serpentine bending tube 96 provided in the shell, a water outlet is provided next to the oil inlet, and a water inlet is provided next to the oil outlet. A temperature sensor 93 is embedded in the side wall of the oil outlet, and the output end of the temperature sensor is connected to the control unit, and the control unit is connected to the control end of the water pump connected to the water inlet.

[0107] A water inlet branch 91 is connected to the water inlet side wall 90, and a water outlet branch 91' is connected to the water outlet side wall. The water inlet branch is connected to the upper end of the inner heat exchange tube 102 set in the serpentine bending tube, and the lower end of the inner heat exchange tube is connected to the water outlet branch. The outer edge of the inner heat exchange tube and the inner edge of the serpentine bending tube are spaced 105 apart.

[0108] The water inlet continuously flows into cold water 94 ( Fig.11 The solid arrow in the middle shows the lubricating oil flowing through the serpentine bending pipe during the flow process. Fig.11 At the same time, the cold water in the water inlet branch flows to the water outlet branch through the internal heat exchange pipe, and in the process of flowing, it exchanges heat inside with the lubricating oil flowing in the serpentine bending pipe.

[0109] The ends of two oil pipes 97 adjacent to each other in the vertical direction of the serpentine bend pipe are connected through an elbow cover 98. Figures 13 to 17 As shown, the upper end 106 and the lower end thereof are respectively connected to the two oil pipes by welding, and the side wall end face 107 beside the opening of the elbow cover between the two oil pipes is closed by the edge 109 of the baffle 103. The upper end face and the bottom face of the elbow cover are both semicircular corresponding to the upper end and the lower end of the oil pipe, and the upper and lower oil pipes are welded to the upper end and the lower end of the elbow cover so that the upper end and the lower end are completely closed, and the bottom face 104 of the oil pipe located at the upper end of the elbow cover and the upper end face 142 of the oil pipe located at the lower end of the elbow cover are respectively fitted with the arc surface 108 made on the upper end and the lower end of the baffle.

[0110] When the elbow cover and baffle seal the ends of the upper and lower oil pipes, Fig.15As shown, the straight pipe section of the inner heat exchange pipe is embedded in the oil pipe, the arc-shaped connecting section of the inner heat exchange pipe is embedded in the elbow cover, and the joint 143 between the straight pipe section and the arc-shaped connecting section is located inside the elbow cover.

[0111] In order to ensure the gap between the inner heat exchange tube and the serpentine bend tube, a bracket can be set between the oil pipe and the straight pipe section before the elbow cover is welded. The bracket should be as strong and small as possible, that is, it can stably support and will not affect the flow rate of the lubricating oil. In addition, the welds of each welding point need to be kept uniform and polished smoothly, and a leak test is required before use. Finally, the inner diameter of the serpentine bend tube is slightly larger, while the outer diameter of the inner heat exchange tube is moderate, so that the gap between the two is roughly maintained at 3 to 10 cm. Of course, the inner diameter of the serpentine bend tube, the inner diameter of the inner heat exchange tube, and the gap between the two can be determined according to parameters such as the viscosity and flow rate of the lubricating oil.

[0112] The temperature sensor is mainly used to detect the temperature of the lubricating oil at the oil outlet. Generally speaking, after heat exchange between the outside and the inside, the temperature of the lubricating oil at the oil outlet has been reduced to a suitable range, and can be sampled for detection and filtered. In order to avoid problems, the detection data of the temperature sensor is regularly transmitted to the control unit, and the control unit compares the received data with the preset value. Once the alarm range is exceeded, the control unit can automatically drive the water pump to increase the power through the frequency converter and other equipment, increase the flow rate of the cold water, so that the temperature of the lubricating oil at the oil outlet returns to the normal range, and then the water pump can reduce the power to work.

[0113] In the present invention, a dustproof structure is used to improve the accuracy of material level detection in a silo, a trajectory detection mechanism is used to improve the stability of the operation of a rotating shaft and a screw, a displacement detection mechanism is used to improve the safety of the operation of a gearbox, a sound insulation structure is used to reduce physical harm to operators, a water cooling jacket is used to increase the service life of a vibration sensor, and an outer shell, a serpentine bending tube and an inner heat exchange tube are used to improve the heat exchange efficiency of the lubricating oil. Through the mutual cooperation of the above structures, the operation of the existing older model of a twin-screw extrusion granulator is made safer and more stable.

Claims

1. A comprehensive detection system for a twin-screw extruder granulator, comprising a pelletizing section, a melting pump, a mixing section, a feeding section, a silo, a gearbox, a motor, a cooling unit and a control unit, wherein the motor is connected to one end of the gearbox, the gearbox is connected to a rotating shaft at one end of the feeding section, a silo is arranged on the upper end surface of the feeding section, and the other end of the feeding section is connected to the mixing section, the melting pump and the pelletizing section in sequence, characterized in that: A dustproof structure is arranged outside the 3D level detection device installed in the silo, a reciprocating trajectory detection mechanism is arranged at the rotating shaft, a displacement detection mechanism is arranged on the gearbox, and a sound insulation structure is arranged outside the gearbox and the motor; The dustproof structure is as follows: a mounting tube with an upper end opening and a lower end extending into the silo is provided at the mounting position at the upper end of the silo, the 3D level detection device is embedded in the mounting tube, the emitting end of the bottom surface of the 3D level detection device is aligned with the viewing window provided on the bottom surface of the mounting tube, a sealing cover which can be sealed and connected with the upper end of the mounting tube is provided at the outer edge of the 3D level detection device, an air inlet is provided at the upper end of the mounting tube, the air inlet passes through the upper end of the sealing cover and is connected to the air source, the lower end of the air inlet is communicated with the nozzle provided on the bottom surface of the side wall of the mounting tube through the channel in the side wall of the mounting tube, and the air outlet of the nozzle faces the surface of the viewing window; The track detection mechanism is: three electric push rods are arranged on the upper end surface, the front end surface and the rear end surface of the feeding section, the moving ends of the three electric push rods are all facing the gearbox, the moving ends of the two electric push rods located at the front end surface and the rear end surface are each provided with a side eddy current sensor close to the side of the rotating shaft on the same side, and the moving end of the electric push rod located at the upper end surface is provided with a bracket, and the lower ends of both sides of the bracket are provided with upper eddy current sensors close to the rotating shaft on the same side; The moving ends of the two electric push rods located at the front end face and the rear end face can stay at different side positions of the rotating shaft during the process of moving toward the gearbox direction or the feeding section direction and be detected by the side eddy current sensor; the electric push rod located at the upper end face can stay at different upper end face positions of the rotating shaft during the process of moving toward the gearbox direction or the feeding section direction and be detected by the two upper eddy current sensors respectively; The bracket includes a cross bar, a vertical bar and a mounting plate, the cross bar is connected to the moving end of the electric push rod on the same side through a fixing seat, the two ends of the cross bar are respectively connected to a vertical bar, and the lower end of each vertical bar is respectively installed with a mounting plate extending above the upper end surface of the rotating shaft on the same side, and each mounting plate is located above the upper end surface of the rotating shaft on the same side. An upper eddy current sensor is embedded at a position, and the measuring end of each upper eddy current sensor faces the upper end surface of the rotating shaft on the same side; The displacement detection mechanism is: at least two eddy current sensors are embedded in the upper end plate of the gearbox, the measuring ends of the two eddy current sensors extend into the gearbox and are respectively close to the end faces of the driving gears which are set on the outer edges of the two output shafts in the gearbox, a vibration sensor is respectively installed at the four corners of the upper end plate, and a vibration sensor is respectively installed under the side walls of the front end and the rear end of the gearbox; The sound insulation structure is as follows: sound insulation side panels are arranged on the ground at the front end, rear end and both sides of the rotating shaft, gearbox and motor of the feeding section, a sound insulation top panel is arranged at the upper end of the four sound insulation side panels, an observation window for observing the rotating shaft of the feeding section and an observation window for observing the gearbox and the motor are arranged on the sound insulation side panels, a valve is arranged on any one of the sound insulation side panels, and gaps are reserved between the rotating shaft of the feeding section, the gearbox and the motor and the sound insulation side panels and the sound insulation top panel; Soundproof side panels are arranged on the ground at the front end, the rear end and both sides of the pelletizing section, a soundproof top panel is arranged at the upper ends of the four soundproof side panels, an observation window for observing the pelletizing section is arranged on the soundproof side panels, a valve is arranged on any one of the soundproof side panels, and a gap is reserved between the pelletizing section and the soundproof side panels and the soundproof top panel; The structure of the sound insulation side panel includes an outer plastic steel plate, an inner plastic steel plate, sound absorbing cotton, sound insulation felt and gypsum board, the sound absorbing cotton is embedded between the outer plastic steel plate and the inner plastic steel plate, the inner surface of the inner plastic steel plate is attached with sound insulation felt, and the inner surface of the sound insulation felt is attached with gypsum board; The structure of the soundproof top plate includes an outer plastic steel plate, an inner plastic steel plate, sound-absorbing cotton, sound insulation felt and gypsum board, the sound-absorbing cotton is embedded between the outer plastic steel plate and the inner plastic steel plate, the sound insulation felt is attached to the inner surface of the inner plastic steel plate, and the gypsum board is attached to the inner surface of the sound insulation felt; The structure of the valve comprises an outer plastic steel plate, an inner plastic steel plate, sound-absorbing cotton, sound-proof felt and gypsum board, the sound-absorbing cotton is embedded between the outer plastic steel plate and the inner plastic steel plate, the sound-proof felt is attached to the inner surface of the inner plastic steel plate, and the gypsum board is attached to the inner surface of the sound-proof felt; The observation window uses a three-layer glass structure, and the space between two adjacent layers of glass is in a vacuum state; At least one vibration sensor is arranged on the surface of the connecting plate between the mixing section and the melting pump, a water cooling jacket is attached to the outer edge of the vibration sensor, a layer of heat-conducting graphite film is embedded between the water cooling jacket and the vibration sensor, and a temperature sensor for detecting the temperature value of the outer edge of the vibration sensor is arranged on the inner edge of the water cooling jacket, the water cooling jacket is composed of two arc-shaped jackets, the two arc-shaped jackets are symmetrically buckled on the outer edge of the vibration sensor and are fastened together by fixing bolts on fixing plates arranged at both ends of the two arc-shaped jackets; The outer shape of the shell of the cooling unit is square or rectangular, an oil inlet is arranged on the right side of the bottom surface of the shell, an oil outlet is arranged on the left side of the upper end surface of the shell, the oil inlet and the oil outlet are connected to each other through a serpentine bending pipe arranged in the shell, a water outlet is arranged beside the oil inlet, a water inlet is arranged beside the oil outlet, and a temperature sensor is embedded in the side wall of the oil outlet; A water inlet branch is connected to the side wall of the water inlet, and a water outlet branch is connected to the side wall of the water outlet. The water inlet branch is connected to the upper end of the inner heat exchange tube set in the serpentine bending tube, and the lower end of the inner heat exchange tube is connected to the water outlet branch. The outer edge of the inner heat exchange tube is spaced from the inner edge of the serpentine bending tube. The ends of two oil pipes adjacent to each other in the vertical direction of the serpentine bending pipe are connected through an elbow cover, the upper end and the lower end of the elbow cover are respectively connected to the two oil pipes, and the opening of the elbow cover between the two oil pipes is closed by a baffle; The upper end surface and the bottom surface of the elbow cover are both semicircular corresponding to the upper end and the lower end of the oil pipe, and the bottom surface of the oil pipe located at the upper end of the elbow cover and the upper end surface of the oil pipe located at the lower end of the elbow cover are respectively in contact with the arc-shaped surfaces formed at the upper end and the lower end of the baffle; The oil pipe is embedded in the straight pipe section of the inner heat exchange pipe, and the elbow cover is embedded in the arc-shaped connecting section of the inner heat exchange pipe.

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