Gear box for double-screw extruder

Abstract

The invention relates to a gear box for a double-screw extruder applied to the technical field of gear boxes, which comprises a gear box main body and a circulating filtration chip detection mechanism, the circulating filtration chip detection mechanism comprises a circulating pump, and the suction end and the output end of the circulating pump are respectively communicated with the interior of the gear box main body through a filtration detection assembly and a return pipeline; the filtering and detecting assembly comprises a guide suction pipe communicated with the suction end of the circulating pump and an oil outlet pipe communicated with the interior of the gear box body, and the filtering and detecting assembly is arranged between the guide suction pipe and the oil outlet pipe and comprises a detecting cylinder with the two ends communicated with the guide suction pipe and the oil outlet pipe respectively; the circulating filtration chip detection mechanism can automatically detect lubricating oil in the gearbox at regular intervals, detect whether the lubricating oil has large-size metal chips or not and give an alarm when it is detected that the large-size metal chips exist in the lubricating oil, so that relevant technicians can be prompted to perform shutdown inspection and maintenance on the gearbox in time, and the working efficiency is improved. And the safety of the gearbox is greatly improved.

Description

Technical Field

[0001] The present invention relates to a gearbox, and particularly to a gearbox for a twin-screw extruder applied to the technical field of gearboxes. Background Art

[0002] With the continuous development of extruder technology, twin-screw extruders are increasingly widely used in industries such as plastic processing, chemical engineering, and food. The gearbox is the core transmission device of the twin-screw extruder, and its function is to convert the power of the motor into the rotational motion of the twin-screws through gear meshing, realizing the adjustment of speed and torque to meet the requirements of the extrusion process for material mixing, plasticization, and extrusion.

[0003] The invention patent with the publication number CN118564633B discloses a gearbox for a twin-screw extruder, which realizes the automatic cleaning of iron filings, reduces the maintenance workload, and the thoroughly filtered lubricating oil drips back to the bottom of the liquid storage tank to prepare for the next lubrication cycle, realizing the continuous, efficient, and clean utilization of the lubricating oil.

[0004] The invention patent application with the publication number CN118375717A discloses a twin-screw extruder gearbox and its use method. In this application, a collection component is connected to the bottom of the gearbox main body, and a sliding groove is opened on the inner wall of the gearbox main body. A moving component is slidably connected in the sliding groove. The collection component is used to collect the liquid for lubricating and cooling the gear set, and the moving component is used to concentrate the liquid at the bottom of the inner wall of the gearbox main body.

[0005] Lubricating oil plays a crucial role during the operation of the gearbox, ensuring the continuous lubrication of gears and bearings and reducing wear. When the gearbox is working, due to frictional wear, some metal debris will inevitably be generated. The metal debris is easily mixed into the lubricating oil, which will not only affect the lubrication performance of the lubricating oil but also may cause equipment chain failures. Therefore, it is usually necessary to clean or replace the lubricating oil regularly. Under normal circumstances, the size of the metal debris is generally relatively small (mostly less than 15 μm), but in some abnormal situations (such as abnormal wear of gears and bearings), some metal debris with larger sizes (such as greater than 50 μm) will appear. The appearance of metal debris with larger sizes not only indicates that the operation of the gearbox may be abnormal but also significantly increases the harm of the metal debris, and it is necessary to stop the machine for inspection and maintenance in a timely manner. However, the existing gearboxes generally do not have corresponding detection and warning mechanisms and cannot detect the situation that the lubricating oil contains large-size metal debris in a timely manner, posing certain safety hazards. Therefore, we propose a gearbox for a twin-screw extruder. Summary of the Invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the gearboxes in the prior art generally do not have corresponding detection and warning mechanisms, and it is impossible to timely detect the situation that the lubricating oil contains large-sized metal chips, which poses a certain safety hazard.

[0007] To solve the above problems, the present invention provides a gearbox for a twin-screw extruder, which includes a gearbox main body and a circulating filtration and chip detection mechanism. The circulating filtration and chip detection mechanism includes a circulating pump. The suction end and the output end of the circulating pump are respectively connected to the inside of the gearbox main body through a filtration and detection component and a return pipeline; The filtration and detection component includes a suction pipe connected to the suction end of the circulating pump and an oil outlet pipe connected to the inside of the gearbox main body. A filtration and detection component is arranged between the suction pipe and the oil outlet pipe. The filtration and detection component includes a detection cylinder with both ends respectively connected to the suction pipe and the oil outlet pipe. A detection filter screen is fixedly installed in the detection cylinder. The aperture of the detection filter screen is 50-100 μm. Above the detection filter screen, there is a pressure detection iron plate slidably and sealingly connected to the detection cylinder. A through oil hole is opened in the middle of the pressure detection iron plate. Just below the through oil hole, there is a complementary hole connection pressure block matching it. Elastic suspension ropes are fixedly connected between the pressure detection iron plate and the top inner wall of the detection cylinder, and between the complementary hole connection pressure block and the top inner wall of the detection cylinder. A pair of linkage blocks are fixedly installed inside the through oil hole. The top of the linkage block is flush with the top of the pressure detection iron plate. The sum of the thicknesses of the linkage block and the complementary hole connection pressure block is equal to the thickness of the pressure detection iron plate. A distance sensor is arranged above the pressure detection iron plate, a detection electromagnet is arranged below the detection filter screen, and an outflow solenoid valve is arranged on the oil outlet pipe; The circulating filtration and chip detection mechanism further includes a circulating detection and analysis system, which includes a detection control module, a detection analysis module, and a ringing warning module. The detection control module is signal-connected to the circulating pump, the distance sensor, the detection electromagnet, and the outflow solenoid valve. The distance sensor is signal-connected to the detection analysis module, and the detection analysis module is signal-connected to the ringing warning module.

[0008] In the above-mentioned gearbox for a twin-screw extruder, the circulating filtration and chip detection mechanism can automatically detect whether the lubricating oil contains large-sized metal chips, and can give an alarm when large-sized metal chips are detected in the lubricating oil.

[0009] As a further improvement of the present application, the detection cylinder is filled with lubricating oil. An oil drain hole is opened on the pressure detection iron plate. A fine filter screen matching it is fixedly installed in the oil drain hole. Above the fine filter screen, there is a sealing block slidably and sealingly connected to the oil drain hole. A pair of elastic pull ropes are fixedly connected between the sealing block and the fine filter screen. The bottom end of the fine filter screen is flush with the bottom end of the pressure detection iron plate, and the aperture of the fine filter screen is smaller than that of the detection filter screen.

[0010] As a further improvement of the present application, an anti-deviation rod is fixedly connected to the top end of the fine filter screen. The anti-deviation rod passes through the sealing block and is slidably and sealingly connected thereto. The top end of the sealing block is flush with the top end of the pressure inspection iron plate. A pressure sleeve is sleeved on the outer wall of the anti-deviation rod and is slidably connected thereto. The top end of the pressure sleeve is fixedly connected to the sealing block, and the bottom end of the pressure sleeve abuts against the fine filter screen.

[0011] As a further improvement of the present application, a filter extraction hole is formed in the outer wall of the detection cylinder. The filter extraction hole is located between the pressure inspection iron plate and the detection filter screen. A sealing plug plate is movably and sealingly connected to the filter extraction hole. A sealing sleeve is sleeved on the outer wall of the detection cylinder and is slidably and sealingly connected thereto. The filter extraction hole is located inside the sealing sleeve. The top end of the detection filter screen is fixedly connected to a guiding rod. The guiding rod passes through the hole-filling and pressure-linking block and is slidably and sealingly connected thereto. The guiding rod can play a guiding role to prevent the hole-filling and pressure-linking block from deviating from the oil passage hole.

[0012] As another improvement of the present application, the return pipeline includes a discharge pipe communicated with the output end of the circulation pump and an oil return pipe communicated with the inside of the gearbox body. An impurity removal assembly is arranged between the discharge pipe and the oil return pipe. The impurity removal assembly includes an impurity removal cylinder. An impurity removal carrier column is slidably and sealingly connected to the inside of the impurity removal cylinder. A circular tube-shaped impurity removal electromagnet is embedded through the impurity removal carrier column. The circulation inspection and analysis system further includes an impurity removal control module.

[0013] As a supplement to another improvement of the present application, the detection control module is signal-connected to the impurity removal control module, and the impurity removal control module is signal-connected to the impurity removal electromagnet. The end of the discharge pipe away from the circulation pump penetrates through the bottom outer wall of the impurity removal cylinder and is communicated with the inside of the impurity removal electromagnet. The end of the oil return pipe away from the gearbox body penetrates through the top outer wall of the impurity removal cylinder and is communicated with the inside of the impurity removal electromagnet. A return solenoid valve is arranged on the oil return pipe. The detection control module is signal-connected to the return solenoid valve.

[0014] As a supplement to another improvement of the present application, the end of the impurity removal cylinder away from the circulation pump is open-shaped. A horizontal electric push rod is fixedly installed on the outer wall of the impurity removal cylinder. A connecting rod is fixedly connected between the output end of the horizontal electric push rod and the impurity removal carrier column. The circulation inspection and analysis system further includes a chip cleaning control module. The detection control module is signal-connected to the chip cleaning control module. The chip cleaning control module is signal-connected to both the impurity removal electromagnet and the horizontal electric push rod.

[0015] As a supplement to another improvement of the present application, an air pump is arranged above the impurity removal cylinder. The output end of the air pump is communicated with an air guide pipe. The end of the air guide pipe away from the air pump is communicated with the inside of the impurity removal cylinder. The chip cleaning control module is signal-connected to the air pump.

[0016] As a supplement to another improvement of the present application, a chip guide pipe is communicated with the bottom end of the impurity removal cylinder. The chip guide pipe is located directly below the air guide pipe. A chip receiving pipe is threaded on the outer wall of the chip guide pipe. A chip receiving filter screen is fixedly installed inside the chip receiving pipe.

[0017] As a supplement to another improvement of the present application, an oil guide pipe is also connected to the bottom end of the chip removal cylinder. The oil guide pipe is located on the side of the chip guide pipe close to the chip removal support column. The bottom end of the oil guide pipe is connected to a temporary storage cylinder. A vertical electric push rod is fixedly installed in the temporary storage cylinder. The output end of the vertical electric push rod is fixedly connected to a piston plate that is slidably and sealingly connected to the temporary storage cylinder. The chip cleaning control module is signal-connected to the vertical electric push rod.

[0018] In summary, through the setting of the circulation filter and chip detection mechanism in the present application, the circulation filter and chip detection mechanism can regularly and automatically detect the lubricating oil in the gearbox, detect whether there are metal chips with larger sizes in the lubricating oil, and can give an alarm when metal chips with larger sizes are detected in the lubricating oil, so as to prompt relevant technical personnel to stop the machine and check and maintain the gearbox in time, greatly improving the safety of the gearbox; through the setting of the chip removal component, when detecting the lubricating oil, the iron chips in the lubricating oil can be effectively removed, thereby effectively improving the quality of the lubricating oil, and further improving the operation safety and stability of the gearbox. Through the combined setting of the air pump, the air guide pipe, the chip guide pipe, etc., and after the detection is completed, the iron chips adsorbed on the inner wall of the chip removal electromagnet can be automatically cleaned. On the one hand, it can prevent the iron chips from falling back into the lubricating oil again, and on the other hand, it is beneficial to ensure the subsequent chip removal effect. Description of the Drawings

[0019] Figure 1 Is a three-dimensional structural diagram of the first embodiment of the present application; Figure 2 Is a sectional structural diagram of the detection cylinder in the first embodiment of the present application; Figure 3 For the present application Figure 2 The enlarged structural diagram at A; Figure 4 Is a structural block diagram of the circulation detection and control analysis system in the first embodiment of the present application; Figure 5 Is a three-dimensional structural diagram of the second embodiment of the present application; Figure 6 Is a three-dimensional structural diagram of the chip removal component in the second embodiment of the present application; Figure 7 Is a sectional structural diagram of the chip removal cylinder in the second embodiment of the present application; Figure 8 Is a sectional structural diagram of the chip receiving pipe in the second embodiment of the present application; Figure 9 Is a sectional structural diagram of the temporary storage cylinder in the second embodiment of the present application; Figure 10 Is a structural block diagram of the circulation detection and control analysis system in the second embodiment of the present application.

[0020] Description of reference numerals in the figure: 101, main body of the gearbox; 102, circulation pump; 201, guide suction pipe; 202, oil outlet pipe; 301, detection cylinder; 302, detection filter screen; 303, pressure detection iron plate; 304, oil passing hole; 305, hole filling and pressure connecting block; 306, elastic suspension rope; 307, linkage block; 308, distance sensor; 309, detection electromagnet; 310, sealing plug plate; 311, sealing sleeve; 312, guide rod; 313, oil drain hole; 314, fine filter screen; 315, sealing block; 316, elastic pull rope; 317, anti-deviation rod; 401, guide discharge pipe; 402, return oil pipe; 501, chip removal cylinder; 502, chip removal carrier column; 503, chip removal electromagnet; 504, horizontal electric push rod; 505, connecting rod; 506, air pump; 507, air guide pipe; 508, chip guide pipe; 509, chip receiving pipe; 510, chip receiving filter screen; 511, oil guide pipe; 512, temporary storage cylinder; 513, vertical electric push rod; 514, piston plate. Specific embodiments

[0021] The following describes two embodiments of the present application in detail with reference to the accompanying drawings.

[0022] The first embodiment: Figures 1-4 A gearbox for a twin-screw extruder is shown, including a main body 101 of the gearbox and a filtering and chip detection mechanism. The filtering and chip detection mechanism includes a circulation pump 102. The suction end and the output end of the circulation pump 102 are respectively connected to the inside of the main body 101 of the gearbox through a filtering and detection component and a return pipeline (in this embodiment, the return pipeline is a pipeline with two ends respectively connected to the inside of the main body 101 of the gearbox and the output end of the guide suction pipe 201). The filter and inspection component includes a suction pipe 201 connected to the suction end of the circulation pump 102 and an oil outlet pipe 202 connected to the inside of the gearbox main body 101. A filter and inspection component is arranged between the suction pipe 201 and the oil outlet pipe 202. The filter and inspection component includes a detection cylinder 301 with both ends respectively connected to the suction pipe 201 and the oil outlet pipe 202. A detection filter screen 302 is fixedly installed in the detection cylinder 301. The pore size of the detection filter screen 302 is 50 - 100 μm (the size of the pore size of the detection filter screen 302 can be reasonably determined according to the actual situation). Above the detection filter screen 302, there is a pressure inspection iron plate 303 slidably and sealingly connected to the detection cylinder 301. A through oil hole 304 is opened in the middle of the pressure inspection iron plate 303. Right below the through oil hole 304, there is a complementary hole connection pressure block 305 matching it. Elastic suspension ropes 306 are fixedly connected between the pressure inspection iron plate 303 and the top inner wall of the detection cylinder 301, and between the complementary hole connection pressure block 305 and the top inner wall of the detection cylinder 301. A pair of linkage blocks 307 are fixedly installed inside the through oil hole 304. The top of the linkage blocks 307 is flush with the top of the pressure inspection iron plate 303. The sum of the thicknesses of the linkage blocks 307 and the complementary hole connection pressure block 305 is equal to the thickness of the pressure inspection iron plate 303. Above the pressure inspection iron plate 303, there is a distance sensor 308. Below the detection filter screen 302, there is a detection electromagnet 309. An outflow solenoid valve is arranged on the oil outlet pipe 202; The circulating filter and debris inspection mechanism further includes a circulating inspection and analysis system. The circulating inspection and analysis system includes a detection control module, a detection analysis module, and a ringing warning module. The detection control module is in signal connection with the circulation pump 102, the distance sensor 308, the detection electromagnet 309, and the outflow solenoid valve. The distance sensor 308 is in signal connection with the detection analysis module. The detection analysis module is in signal connection with the ringing warning module.

[0023] In the detection control module, a detection period and a circulation duration are preset. The detection control module will perform detection operations regularly according to the detection period. During detection, the detection control module will open the outflow solenoid valve and start the circulation pump 102. After the circulation pump 102 is started, it will continuously extract lubricating oil from the gearbox main body 101 through the oil suction pipeline, and at the same time, make the lubricating oil flow back into the gearbox main body 101 through the return pipeline. When the lubricating oil flows through the detection filter screen 302, the detection filter screen 302 will filter the lubricating oil. If there are larger metal debris in the lubricating oil (normal, smaller metal debris will pass through the detection filter screen 302), they will be filtered out by the detection filter screen 302. After the operation duration of the circulation pump 102 reaches the circulation duration, the detection control module will turn off the circulation pump 102 and the outflow solenoid valve. Subsequently, the detection control module will start the distance sensor 308 and control the detection electromagnet 309 to be energized. After the distance sensor 308 is started, it will continuously detect the distance between it and the pressure inspection iron plate 303, and the distance data detected by the distance sensor 308 will be transmitted to the detection analysis module in real time for the detection analysis module to analyze and judge; After the detection electromagnet 309 is energized, under the action of the magnetic suction force, the pressure detection iron plate 303 will move downward. When the pressure detection iron plate 303 moves to the hole-filling and connecting pressure block 305, the hole-filling and connecting pressure block 305 will insert into the oil passage hole 304. Then, under the action of the linkage block 307, the hole-filling and connecting pressure block 305 will move downward together with the pressure detection iron plate 303. By setting the thicknesses of the pressure detection iron plate 303, the hole-filling and connecting pressure block 305, and the linkage block 307, after the hole-filling and connecting pressure block 305 inserts into the oil passage hole 304, the bottom end of the hole-filling and connecting pressure block 305 will be flush with the bottom end of the pressure detection iron plate 303. At this time, the bottom ends of the pressure detection iron plate 303 and the hole-filling and connecting pressure block 305 can form a complete plane that matches the detection filter screen 302. Suppose when the pressure detection iron plate 303 moves downward to fit with the detection filter screen 302, the distance between the distance sensor 308 and the pressure detection iron plate 303 is L (L is a known and fixed value, and L is pre-input in the detection and analysis module). If there are no metal debris on the detection filter screen 302, the pressure detection iron plate 303 and the hole-filling and connecting pressure block 305 will move to fit with the detection filter screen 302. Finally, the distance data detected by the pressure detection iron plate 303 will be the same as L. On the contrary, if there are metal debris on the detection filter screen 302, the pressure detection iron plate 303 and the hole-filling and connecting pressure block 305 will not be able to move to fit with the detection filter screen 302, but will be stuck above the detection filter screen 302 after moving to abut against the metal debris. Finally, the distance data detected by the pressure detection iron plate 303 will be less than L. Therefore, the detection and analysis module can judge whether there are metal debris with larger sizes filtered out by the detection filter screen 302 by analyzing the distance data detected by the distance sensor 308. After obtaining the judgment result, the detection control module will turn off the distance sensor 308 and control the detection electromagnet 309 to cut off the power supply; When the judgment result is that the detection filter screen 302 has filtered out metal debris with larger sizes, it means that the lubricating oil contains metal debris with larger sizes. At this time, the detection and analysis module will control the ringing warning module to emit an alarm sound for warning; Therefore, through the setting of the circulating filter debris detection mechanism, the circulating filter debris detection mechanism can regularly and automatically detect the lubricating oil in the gearbox, detect whether there are metal debris with larger sizes in the lubricating oil, and can give an alarm when metal debris with larger sizes are detected in the lubricating oil, thereby prompting relevant technical personnel to stop the machine and check and maintain the gearbox in time, greatly improving the safety of the gearbox.

[0024] The detection cylinder 301 is filled with lubricating oil to prevent the amount of lubricating oil in the main body 101 of the gearbox from decreasing due to detection, and further prevent the oil level of the lubricating oil in the main body 101 of the gearbox from being too low due to detection. An oil drain hole 313 is provided on the pressure detection iron plate 303, and a fine filter screen 314 matching it is fixedly installed in the oil drain hole 313. Above the fine filter screen 314, there is a sealing block 315 slidably and sealingly connected to the oil drain hole 313. A pair of elastic pull ropes 316 are fixedly connected between the sealing block 315 and the fine filter screen 314. The bottom end of the fine filter screen 314 is flush with the bottom end of the pressure detection iron plate 303, and the aperture of the fine filter screen 314 is smaller than that of the detection filter screen 302. Since there is lubricating oil in the detection cylinder 301, when the pressure detection iron plate 303 and the hole-filling and pressure-linking block 305 move downward together, the lubricating oil below them will be squeezed. At this time, the lubricating oil will squeeze the sealing block 315, causing the sealing block 315 to move upward. In this way, the lubricating oil can flow through the oil drain hole 313 to the upper part of the pressure detection iron plate 303 and the hole-filling and pressure-linking block 305, so that the pressure detection iron plate 303 and the hole-filling and pressure-linking block 305 can move downward smoothly, and further avoid affecting the accuracy of detection.

[0025] The top end of the fine filter screen 314 is fixedly connected with an anti-deviation rod 317. The anti-deviation rod 317 passes through the sealing block 315 and is slidably and sealingly connected to it. The anti-deviation rod 317 can play a guiding role to prevent the sealing block 315 from deviating from the oil drain hole 313. The top end of the sealing block 315 is flush with the top end of the pressure detection iron plate 303. A counter-pressure sleeve slidably connected to it is sleeved on the outer wall of the anti-deviation rod 317. The top end of the counter-pressure sleeve is fixedly connected with the sealing block 315, and the bottom end of the counter-pressure sleeve abuts against the fine filter screen 314. The counter-pressure sleeve can play a role in restricting the downward movement of the sealing block 315.

[0026] An extraction filter hole is provided on the outer wall of the detection cylinder 301. The extraction filter hole is located between the pressure detection iron plate 303 and the detection filter screen 302. A sealing plug plate 310 is provided at the extraction filter hole and is movably and sealingly connected to it. A sealing sleeve 311 is sleeved on the outer wall of the detection cylinder 301 and is slidably and sealingly connected to it. The extraction filter hole is located inside the sealing sleeve 311. When it is detected that there are relatively large metal debris in the lubricating oil, when relevant technicians check and maintain the gearbox, they can conveniently clean the relatively large metal debris filtered out on the detection filter screen 302. When cleaning, first slide the sealing sleeve 311 to expose the sealing plug plate 310, and then remove the sealing plug plate 310, and the metal debris on the detection filter screen 302 can be taken out through the extraction filter hole, making the metal debris filtered out on the detection filter screen 302 easy to clean, which is conducive to subsequent detection. The top end of the detection filter screen 302 is fixedly connected with a guiding rod 312. The guiding rod 312 passes through the hole-filling and pressure-linking block 305 and is slidably and sealingly connected to it. The guiding rod 312 can play a guiding role to prevent the hole-filling and pressure-linking block 305 from deviating from the oil passing hole 304.

[0027] The second implementation mode: Figures 5-10 A gearbox for a twin-screw extruder is shown. Different from the first implementation mode, the reflux pipeline includes a drain pipe 401 connected to the output end of the circulation pump 102 and an oil return pipe 402 connected to the inside of the gearbox main body 101. A chip removal component is arranged between the drain pipe 401 and the oil return pipe 402. The chip removal component includes a chip removal cylinder 501. A chip removal carrier column 502 is arranged in the chip removal cylinder 501 and is slidably and sealingly connected thereto. A chip removal electromagnet 503 in the shape of a circular tube is embedded through the chip removal carrier column 502. The circulation inspection and analysis system further includes a chip removal control module. The detection control module is signal-connected to the chip removal control module, and the chip removal control module is signal-connected to the chip removal electromagnet 503. One end of the drain pipe 401 away from the circulation pump 102 penetrates through the outer wall of the bottom end of the chip removal cylinder 501 and is connected to the inside of the chip removal electromagnet 503. One end of the oil return pipe 402 away from the gearbox main body 101 penetrates through the outer wall of the top end of the chip removal cylinder 501 and is connected to the inside of the chip removal electromagnet 503. A reflux solenoid valve is arranged on the oil return pipe 402. The detection control module is signal-connected to the reflux solenoid valve.

[0028] During detection, when the detection control module opens the outflow solenoid valve, it will also open the reflux solenoid valve at the same time, and when the detection control module closes the outflow solenoid valve, it will also close the reflux solenoid valve at the same time. Metal debris is usually mainly iron filings (mainly from steel components such as gears and bearings). In this implementation mode, before starting the detection, the detection control module will send a signal to the chip removal control module, so that during detection, the chip removal control module will control the chip removal electromagnet 503 to be energized. During the detection process, the lubricating oil will flow back into the gearbox main body 101 through the drain pipe 401, the chip removal electromagnet 503, and the oil return pipe 402. When the lubricating oil flows through the chip removal electromagnet 503, the iron filings in the lubricating oil will be adsorbed to the inner wall of the chip removal electromagnet 503. Therefore, through the setting of the chip removal component, when the lubricating oil is detected, the iron filings in the lubricating oil can be effectively removed, thereby effectively improving the quality of the lubricating oil, and further improving the operation safety and stability of the gearbox.

[0029] One end of the chip removal cylinder 501 away from the circulation pump 102 is arranged in an open shape. A horizontal electric push rod 504 is fixedly installed on the outer wall of the chip removal cylinder 501. A connecting rod 505 is fixedly connected between the output end of the horizontal electric push rod 504 and the chip removal carrier column 502. The circulation inspection and analysis system further includes a chip cleaning control module. The detection control module is signal-connected to the chip cleaning control module. The chip cleaning control module is signal-connected to both the chip removal electromagnet 503 and the horizontal electric push rod 504. An air pump 506 is arranged above the chip removal cylinder 501. The output end of the air pump 506 is communicated with an air guide pipe 507. One end of the air guide pipe 507 away from the air pump 506 is communicated with the inside of the chip removal cylinder 501. The chip cleaning control module is signal-connected to the air pump 506. The bottom end of the chip removal cylinder 501 is communicated with a chip guide pipe 508. The chip guide pipe 508 is located directly below the air guide pipe 507. A chip receiving pipe 509 threadedly connected thereto is sleeved on the outer wall of the chip guide pipe 508. A chip receiving filter screen 510 is fixedly installed in the chip receiving pipe 509.

[0030] After the detection is completed, the detection control module will send a signal to the chip cleaning control module. After receiving the signal, the chip cleaning control module will control the horizontal electric push rod 504 to push the chip removal carrier column 502, so that the chip removal carrier column 502 moves in the direction close to the air guide pipe 507 until the chip removal electromagnet 503 moves to the positions of the air guide pipe 507 and the chip guide pipe 508, causing the upper and lower ends of the chip removal electromagnet 503 to be respectively communicated with the air guide pipe 507 and the chip guide pipe 508. Then, the chip removal electromagnet 503 will control the chip removal electromagnet 503 to power off and start the air pump 506. After the air pump 506 is started, the iron chips adsorbed on the inner wall of the chip removal electromagnet 503 can be blown into the chip receiving pipe 509. The chip receiving filter screen 510 will intercept the iron chips to prevent the iron chips from scattering everywhere. After a certain period of time, the chip cleaning control module will turn off the air pump 506 and control the horizontal electric push rod 504 to pull the chip removal carrier column 502 to reset the chip removal carrier column 502. Therefore, through the combined setting of the air pump 506, the air guide pipe 507, the chip guide pipe 508, etc., after the detection is completed, the iron chips adsorbed on the inner wall of the chip removal electromagnet 503 can be automatically cleaned. On the one hand, it can prevent the iron chips from falling back into the lubricating oil again. On the other hand, it is beneficial to ensure the subsequent iron chip removal effect.

[0031] The bottom end of the chip removal cylinder 501 is also connected to an oil guide pipe 511. The oil guide pipe 511 is located on the side of the chip guide pipe 508 close to the chip removal carrier column 502. The bottom end of the oil guide pipe 511 is connected to a temporary storage cylinder 512. A vertical electric push rod 513 is fixedly installed in the temporary storage cylinder 512. The output end of the vertical electric push rod 513 is fixedly connected to a piston plate 514 that is slidably and sealingly connected to the temporary storage cylinder 512. The chip cleaning control module is signal-connected to the vertical electric push rod 513. When the chip cleaning control module controls the horizontal electric push rod 504 to push the chip removal carrier column 502 and the chip removal electromagnet 503 moves to the position of the oil guide pipe 511 during the process of moving the chip removal carrier column 502 in the direction close to the air guide pipe 507, the chip cleaning control module will control the horizontal electric push rod 504 to pause pushing the chip removal carrier column 502, and the chip cleaning control module will control the vertical electric push rod 513 to pull the piston plate 514 downward. In this way, the lubricating oil inside the chip removal electromagnet 503 can be discharged into the temporary storage cylinder 512 to prevent the lubricating oil from leaking when cleaning the iron chips. Subsequently, the chip cleaning control module will continue to control the horizontal electric push rod 504 to push the chip removal carrier column 502 until the chip removal electromagnet 503 moves to the positions of the air guide pipe 507 and the chip guide pipe 508. In addition, when the chip cleaning control module controls the horizontal electric push rod 504 to pull the chip removal carrier column 502 back to its original position after the iron chips are cleaned, when the chip removal electromagnet 503 moves to the position of the oil guide pipe 511, the chip cleaning control module will also control the horizontal electric push rod 504 to pause pulling the chip removal carrier column 502 and control the vertical electric push rod 513 to push the piston plate 514 upward so that the lubricating oil can flow back into the inside of the chip removal electromagnet 503 again. Therefore, through the combined setting of the oil guide pipe 511, the temporary storage cylinder 512, the vertical electric push rod 513, etc., when cleaning the iron chips adsorbed on the inner wall of the chip removal electromagnet 503, the lubricating oil leakage can be effectively prevented.

[0032] Combined with the current actual requirements, the above implementation manner adopted in this application, the protection scope is not limited to this. Within the knowledge scope of those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A gearbox for a twin-screw extruder, comprising a gearbox body (101), characterized in that, It further includes a circulating filter and chip detection mechanism, which includes a circulating pump (102). The suction end and the output end of the circulating pump (102) are respectively connected to the inside of the gearbox main body (101) through a filter and chip detection component and a return pipeline. The filter and chip detection component includes a suction pipe (201) connected to the suction end of the circulating pump (102) and an oil outlet pipe (202) connected to the inside of the gearbox main body (101). A filter and chip detection component is arranged between the suction pipe (201) and the oil outlet pipe (202). The filter and chip detection component includes a detection cylinder (301) with two ends respectively connected to the suction pipe (201) and the oil outlet pipe (202). A detection filter screen (302) is fixedly installed in the detection cylinder (301). The aperture of the detection filter screen (302) is 50 - 100 μm. Above the detection filter screen (302), there is a pressure detection iron plate (303) slidably and sealingly connected to the detection cylinder (301). A through oil hole (304) is opened in the middle of the pressure detection iron plate (303). A complementary hole connection and pressure block (305) matching it is arranged directly below the through oil hole (304). Elastic suspension ropes (306) are fixedly connected between the pressure detection iron plate (303) and the top inner wall of the detection cylinder (301), and between the complementary hole connection and pressure block (305) and the top inner wall of the detection cylinder (301). A pair of linkage blocks (307) are fixedly installed inside the through oil hole (304). The top of the linkage block (307) is flush with the top of the pressure detection iron plate (303). The sum of the thicknesses of the linkage block (307) and the complementary hole connection and pressure block (305) is equal to the thickness of the pressure detection iron plate (303). A distance sensor (308) is arranged above the pressure detection iron plate (303). A detection electromagnet (309) is arranged below the detection filter screen (302). An outflow solenoid valve is arranged on the oil outlet pipe (202). The circulating filter and chip detection mechanism further includes a circulating detection and analysis system, which includes a detection control module, a detection analysis module, and a ringing warning module. The detection control module is in signal connection with the circulating pump (102), the distance sensor (308), the detection electromagnet (309), and the outflow solenoid valve. The distance sensor (308) is in signal connection with the detection analysis module. The detection analysis module is in signal connection with the ringing warning module.

2. The gearbox for a twin-screw extruder according to claim 1, characterized in that, The detection cylinder (301) is filled with lubricating oil. An oil drain hole (313) is opened in the pressure detection iron plate (303). A fine filter screen (314) matching it is fixedly installed in the oil drain hole (313). Above the fine filter screen (314), there is a sealing block (315) slidably and sealingly connected to the oil drain hole (313). A pair of elastic pull ropes (316) are fixedly connected between the sealing block (315) and the fine filter screen (314). The bottom end of the fine filter screen (314) is flush with the bottom end of the pressure detection iron plate (303), and the aperture of the fine filter screen (314) is smaller than that of the detection filter screen (302).

3. The gearbox for a twin-screw extruder according to claim 2, characterized in that, The top end of the fine filter screen (314) is fixedly connected with an anti-deviation rod (317). The anti-deviation rod (317) penetrates through the sealing block (315) and is in sliding and sealing connection with it. The top end of the sealing block (315) is flush with the top end of the pressure inspection iron plate (303). A counter sleeve that is slidably connected with the anti-deviation rod is sleeved on the outer wall of the anti-deviation rod (317). The top end of the counter sleeve is fixedly connected with the sealing block (315), and the bottom end of the counter sleeve abuts against the fine filter screen (314).

4. A gearbox for a twin-screw extruder according to claim 1, characterized in that, A filter taking hole is formed in the outer wall of the detection cylinder (301). The filter taking hole is located between the pressure inspection iron plate (303) and the detection filter screen (302). A sealing plug plate (310) that is movably and sealingly connected with the filter taking hole is arranged at the filter taking hole. A sealing sleeve (311) that is slidably and sealingly connected with the detection cylinder (301) is sleeved on the outer wall of the detection cylinder (301). The filter taking hole is located inside the sealing sleeve (311). The top end of the detection filter screen (302) is fixedly connected with a guiding rod (312). The guiding rod (312) penetrates through the hole filling and pressure connecting block (305) and is in sliding and sealing connection with it.

5. A gearbox for a twin-screw extruder according to claim 1, characterized in that, The reflux pipeline includes a guide discharge pipe (401) communicated with the output end of the circulation pump (102) and an oil return pipe (402) communicated with the inside of the gearbox main body (101). An impurity removing assembly is arranged between the guide discharge pipe (401) and the oil return pipe (402). The impurity removing assembly includes an impurity removing cylinder (501). An impurity removing carrier column (502) that is slidably and sealingly connected with the impurity removing cylinder (501) is arranged inside the impurity removing cylinder (501). An impurity removing electromagnet (503) in the shape of a circular tube is embedded through the impurity removing carrier column (502). The circulation inspection and analysis system further includes an impurity removing control module.

6. A gearbox for a twin-screw extruder according to claim 5, characterized in that, The detection control module is in signal connection with the impurity removing control module. The impurity removing control module is in signal connection with the impurity removing electromagnet (503). One end of the guide discharge pipe (401) far away from the circulation pump (102) penetrates through the bottom outer wall of the impurity removing cylinder (501) and is communicated with the inside of the impurity removing electromagnet (503). One end of the oil return pipe (402) far away from the gearbox main body (101) penetrates through the top outer wall of the impurity removing cylinder (501) and is communicated with the inside of the impurity removing electromagnet (503). A reflux solenoid valve is arranged on the oil return pipe (402). The detection control module is in signal connection with the reflux solenoid valve.

7. The gearbox for a twin-screw extruder according to claim 6, characterized in that, One end of the impurity removing cylinder (501) far away from the circulation pump (102) is in an open shape. A horizontal electric push rod (504) is fixedly installed on the outer wall of the impurity removing cylinder (501). A connecting rod (505) is fixedly connected between the output end of the horizontal electric push rod (504) and the impurity removing carrier column (502). The circulation inspection and analysis system further includes a chip cleaning control module. The detection control module is in signal connection with the chip cleaning control module. The chip cleaning control module is in signal connection with both the impurity removing electromagnet (503) and the horizontal electric push rod (504).

8. A gearbox for a twin-screw extruder according to claim 7, characterized in that, Above the chip removal cylinder (501), an air pump (506) is provided. The output end of the air pump (506) is communicated with an air guide pipe (507). One end of the air guide pipe (507) far from the air pump (506) is communicated with the inside of the chip removal cylinder (501). The chip cleaning control module is in signal connection with the air pump (506).

9. A gearbox for a twin-screw extruder according to claim 8, characterized in that, The bottom end of the chip removal cylinder (501) is communicated with a chip guide pipe (508). The chip guide pipe (508) is located directly below the air guide pipe (507). A chip receiving pipe (509) threadedly connected thereto is sleeved on the outer wall of the chip guide pipe (508). A chip receiving filter screen (510) is fixedly installed in the chip receiving pipe (509).

10. A gearbox for a twin-screw extruder according to claim 9, characterized in that, The bottom end of the chip removal cylinder (501) is also communicated with an oil guide pipe (511). The oil guide pipe (511) is located on one side of the chip guide pipe (508) close to the chip removal support column (502). The bottom end of the oil guide pipe (511) is communicated with a temporary storage cylinder (512). A vertical electric push rod (513) is fixedly installed in the temporary storage cylinder (512). The output end of the vertical electric push rod (513) is fixedly connected to a piston plate (514) that is slidably and sealingly connected to the temporary storage cylinder (512). The chip cleaning control module is in signal connection with the vertical electric push rod (513).

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