Torque-adjustable distribution box for double-screw extruder

Abstract

The invention relates to an adjustable torque distribution box for a double-screw extruder. The distribution box comprises a box body, a box cover, an input shaft and a driving gear located on the input shaft. The first transmission mechanism and the second transmission mechanism are located in the box body, and the two output shafts are fixedly connected with the first transmission mechanism and the second transmission mechanism respectively. The kinetic energy recovery mechanism is used for carrying out torque distribution on the first transmission mechanism and the second transmission mechanism; the temperature control part is connected with the kinetic energy recovery mechanism and is used for cooling the interior of the box body; stepless and dynamic redistribution of torque between the two output shafts is achieved through controllable friction braking, and the total output capacity and process adaptability of a transmission system are remarkably improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of double-screw extruders, and particularly relates to an adjustable torque distribution box for a double-screw extruder. BACKGROUND

[0002] A double-screw extruder is a core device in the field of polymer material processing, and a torque distribution box in the transmission system of the double-screw extruder is responsible for distributing the power of a main motor to two intermeshing screws. A conventional torque distribution box usually adopts a fixed-ratio gear train (such as 50:50) to distribute torque, and the output capacity of the whole machine is limited by the screw that first reaches the torque limit, and the carrying capacity of the other screw is wasted, which limits the full play of the performance of the device.

[0003] In addition, under high-load working conditions, a large amount of heat is generated inside the gear box, and if the heat dissipation is poor, problems such as accelerated wear of parts and seal failure will occur, which affects the reliability and service life of the device. The existing heat dissipation schemes mostly adopt external cooling systems, which have complex structures and high energy consumption.

[0004] Therefore, there is an urgent need for a new torque distribution box that can not only realize flexible torque distribution to improve the performance of the whole machine, but also efficiently and energy-efficiently dissipate heat inside. SUMMARY

[0005] The purpose of the present application is to provide an adjustable torque distribution box for a double-screw extruder to solve the problems raised in the background.

[0006] The application achieves the above-mentioned purpose through the following technical solutions: An adjustable torque distribution box for a double-screw extruder, comprising a box body, a box cover, an input shaft, a driving gear on the input shaft, a first transmission mechanism and a second transmission mechanism in the box body, two output shafts fixedly connected with the first transmission mechanism and the second transmission mechanism respectively, a kinetic energy recovery mechanism for torque distribution of the first transmission mechanism and the second transmission mechanism, and a temperature control device connected with the kinetic energy recovery mechanism and used for cooling the box body.

[0007] Preferably, the first transmission mechanism and the second transmission mechanism each comprise a driven gear meshing with the driving gear, an intermediate shaft fixedly connected concentrically with the driven gear, a secondary gear fixedly sleeved on the intermediate shaft, and a final gear, and the output shaft is fixedly connected concentrically with the final gear. The first transmission mechanism further comprises a direction-changing gear between the secondary gear and the final gear, and the direction-changing gear is used to adjust the turning directions of the two output shafts to be consistent.

[0008] Preferably, the kinetic energy recovery mechanism comprises two sleeves rotatably arranged in the box, a transmission member arranged between the two sleeves, two moving blocks movably arranged in the two sleeves respectively, two return springs fixedly arranged between the moving blocks and the transmission member respectively and used for controlling the positions of the moving blocks, two clutch discs fixedly connected with the outer ends of the two moving blocks respectively, two telescopic members used for driving the two clutch discs to move along the sleeves axially, and a kinetic energy recovery member fixedly connected with one of the sleeves concentrically, the kinetic energy recovery member being fixedly arranged in the box, the telescopic members being used for making the clutch discs abut against the driven gears when the telescopic members are telescoped, and the driven gears being used for driving the sleeves to rotate and making the kinetic energy recovery member generate electric energy, the electric energy being used for power supply of the temperature control device. The telescopic member is an electric push rod.

[0009] Preferably, a plurality of through holes are arranged on the side wall of the box and communicate with the inner cavity and the outside. The temperature control device comprises a plurality of semiconductor refrigerating sheets arranged in the through holes, and the cold ends of the semiconductor refrigerating sheets face the inner cavity of the box.

[0010] Preferably, the box is provided with a partition for dividing the inner cavity into a plurality of parts, and the secondary gear and the final gear are arranged in a first cavity. The first cavity is filled with cooling liquid. The box is provided with a circulation channel extending through the whole box, and two openings of the circulation channel are arranged in the first cavity. A water pump fixedly connected with the kinetic energy recovery member is arranged in the first cavity, the water pump is fixedly connected with a spray head, the water pump is used for pumping the cooling liquid in the first cavity to the circulation channel and then spraying the cooling liquid from the spray head, and the cooling liquid sprayed from the spray head faces the secondary gear and the final gear.

[0011] Preferably, the height of the spray head is higher than the height of the inlet of the water pump.

[0012] Preferably, a plurality of air jet members for generating water spray are fixedly arranged on the inner side wall of the box.

[0013] Preferably, the air jet members are atomizing cups, the atomizing cups are connected with compressors, and the openings of the atomizing cups face the secondary gear.

[0014] The present application has the following advantages: 1. The present application realizes stepless and dynamic redistribution of the torque between the two output shafts through controllable friction braking, and significantly improves the total output capacity and process adaptability of the transmission system.

[0015] 2. The present application recovers the braking energy in the torque adjustment process in the form of electric energy and directly uses the electric energy for heat dissipation of the system, realizes internal recycling of the energy, and saves energy and protects the environment.

[0016] 3. This invention constructs a multi-mode, graded intelligent heat dissipation system consisting of semiconductor refrigeration, liquid circulation cooling and spray cooling. It can automatically activate the most suitable cooling mode according to the heat load, accurately cool down key parts, and has high reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the housing of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram showing the positional relationship between the reset spring and the sleeve in this invention.

[0018] In the diagram: 1. Housing; 2. Cover; 3. Input shaft; 4. Drive gear; 5. Output shaft; 6. Temperature control device; 7. Driven gear; 8. Intermediate shaft; 9. Secondary gear; 10. Final gear; 11. Reversing gear; 12. Sleeve; 13. Transmission component; 14. Moving block; 15. Return spring; 16. Clutch disc; 17. Telescopic component; 18. Kinetic energy recovery component; 19. Divider; 20. First chamber; 21. Nozzle; 22. Air jet component. Detailed Implementation

[0019] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example 1 like Figures 1-4 As shown, an adjustable torque distribution box for a twin-screw extruder includes a box body 1, a box cover 2, an input shaft 3, a drive gear 4 located on the input shaft 3, a first transmission mechanism and a second transmission mechanism located inside the box body 1, two output shafts 5 fixedly connected to the first transmission mechanism and the second transmission mechanism respectively, a kinetic energy recovery mechanism for distributing torque between the first transmission mechanism and the second transmission mechanism, and a temperature control device 6 connected to the kinetic energy recovery mechanism for cooling the inside of the box body 1.

[0021] It should be noted that the drive gear 4 is connected to an external power source, and the drive gear 4 drives the first transmission mechanism and the second transmission mechanism respectively, distributing the torque evenly to the two output shafts 5, i.e., 50:50. When the system detects a sharp increase in the torque of a certain screw, the kinetic energy recovery mechanism contacts the first / second transmission mechanism and applies a slight braking or reverse driving force. The kinetic energy recovery mechanism converts this braking or reverse driving force into electrical energy, which directly acts on the temperature control device 6, and the temperature control device 6 cools the inside of the housing 1.

[0022] Specifically, both the first and second transmission mechanisms include a driven gear 7 meshing with the driving gear 4, an intermediate shaft 8 concentrically fixedly connected to the driven gear 7, a secondary gear 9 fixedly mounted on the intermediate shaft 8, and a final gear 10. The output shaft 5 is concentrically fixedly connected to the final gear 10. That is, the driving gear 4 meshes with the driven gear 7, the driven gear 7 is connected to the secondary gear 9 via the intermediate shaft 8, the secondary gear 9 meshes with the final gear 10, and the final gear 10 is fixedly connected to the output shaft 5. To ensure that the two output shafts 5 rotate in the same direction, a reversing gear 11 is added between the secondary gear 9 and the final gear 10 in the first transmission mechanism.

[0023] Preferably, the kinetic energy recovery mechanism in this embodiment includes two sleeves 12 rotatably mounted inside the housing 1, a transmission component 13 disposed between the two sleeves 12, two movable blocks 14 movably disposed within the two sleeves 12, two return springs 15 fixedly disposed between the movable blocks 14 and the transmission component 13 for controlling the position of the movable blocks 14, clutch discs 16 fixedly connected to the outer ends of the two movable blocks 14, two telescopic components 17 for driving the two clutch discs 16 to move axially along the sleeves 12, and a kinetic energy recovery component 18 concentrically fixedly connected to one of the sleeves 12. The axial cross-section of the movable block 14 is non-circular, so that the movable block 14 does not rotate when moving within the sleeve 12.

[0024] In this embodiment, the kinetic energy recovery component 18 is fixedly installed inside the housing 1. When the telescopic component 17 extends or retracts, it causes the clutch disc 16 to engage with the driven gear 7. The friction between the clutch disc 16 and the driven gear 7 forces the clutch disc 16 to rotate. When the driven gear 7 drives the sleeve 12 to rotate, it causes the kinetic energy recovery component 18 to generate electrical energy, which is used to power the temperature control device 6. Preferably, the kinetic energy recovery component 18 is a motor. The transmission component 13 can be a chain drive, requiring sprockets to be fixedly mounted on the two sleeves 12, with the chain and sprockets meshing with each other. The telescopic component 17 is an electric push rod.

[0025] It should be noted that the total torque provided by input shaft 3 is fixed. In order to overcome the new load (kinetic energy recovery component 18) on output shaft 5B (defined as output shaft 5 connected to the second transmission mechanism), the transmission system will self-adjust. As a result, more input torque is distributed to output shaft 5B, while the torque distributed to output shaft 5A (defined as output shaft 5 connected to the first transmission mechanism) is relatively reduced, thereby realizing the redistribution of torque. By precisely controlling the strength and phase of the stator magnetic field, the controller can determine the negative torque value when the motor is running as a generator, thereby changing the load size. Synchronization allows the torque distribution to be infinitely adjustable, which can be 50:50, 70:30, or 40:60.

[0026] In this embodiment, the side wall of the housing 1 is provided with several through holes that connect its inner cavity to the outside.

[0027] The temperature control unit 6 includes several thermoelectric cooling chips (also called semiconductor cooling chips) located within through-holes, which are a type of heat pump. Its advantages include the absence of sliding parts, making it suitable for applications with limited space, high reliability requirements, and no refrigerant contamination. Utilizing the Peltier effect of semiconductor materials, when direct current passes through a coupler composed of two different semiconductor materials connected in series, heat is absorbed and released at the two ends of the coupler, achieving cooling. The cold end of the thermoelectric cooling chip faces the inner cavity of the housing 1, and the hot end faces the outside of the housing 1, utilizing the air outside the housing 1 for heat dissipation. The cold end of the thermoelectric cooling chip dissipates heat from the air inside the housing 1, and the cold air dissipates heat from the gears inside the housing 1.

[0028] Example 2 Furthermore, the housing 1 has a partition 19 for dividing its internal cavity into several parts, with the secondary gear 9 and the final gear 10 located in the first cavity 20.

[0029] The first cavity, 20, is filled with coolant. Water can be used as the coolant.

[0030] The housing 1 has circulation channels throughout its entirety, with two openings of the circulation channels located within cavity 20.

[0031] A water pump is fixedly installed in the first chamber 20 and is fixedly connected to the kinetic energy recovery component 18. The water pump is fixedly connected to the nozzle 21. The water pump is used to pump the coolant in the first chamber 20 to the circulation channel and then spray it out from the nozzle 21. The coolant sprayed from the nozzle 21 is directed towards the secondary gear 9 and the final gear 10.

[0032] It should be noted that when the screw torque increases, high temperatures can easily occur at the gear meshing points inside the gearbox. When the kinetic energy recovery mechanism frequently adjusts the torque, it will accumulate a lot of electrical energy, which is used to drive the water pump.

[0033] The semiconductor cooling chip cools the air in the first chamber 20, and the air cools the gears and coolant. When the coolant circulates in the circulation channel, it can cool the entire housing 1.

[0034] Preferably, the height of the nozzle 21 is higher than the height of the water pump inlet. When the water pump stops working, the water accumulated in the nozzle 21 will flow downwards and drive the coolant in the entire circulation channel to flow back. The flowing coolant will gush out from the water pump inlet, which can backwash the filter screen at the water pump inlet and clean some of the worn metal particles mixed in the coolant, preventing the water pump from being blocked.

[0035] Example 3 Furthermore, several jetting components 22 for generating water spray are fixedly installed on the inner wall of the housing 1.

[0036] Preferably, the jet component 22 is an atomizing cup connected to a compressor, with the opening of the atomizing cup facing the secondary gear 9. The compressor is powered by the kinetic energy recovery component 18 and controlled by the main controller.

[0037] It should be noted that the water pump stops operating when the secondary gear 9 and the final gear 10 reach high temperatures, prioritizing power to the thermoelectric cooler. During operation, the secondary gear 9 flings the coolant sprayed from the nozzle 21 in all directions, with some coolant entering the atomizing cup. The compressor then sprays high-speed gas, causing the coolant in the atomizing cup to form a mist. The airflow generated by the rotation of the secondary gear 9 draws in this mist of coolant, allowing for targeted and rapid cooling of the secondary gear 9 and the final gear 10.

[0038] Preferably, the mouth of the atomizing cup can be attached to the surface of the semiconductor cooling chip to collect the water condensed on the surface of the semiconductor cooling chip. The atomized coolant generated in the atomizing cup has a lower temperature and a better cooling effect.

[0039] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An adjustable torque distribution box for a twin-screw extruder, comprising a box body (1), a box cover (2), an input shaft (3), and a drive gear (4) located on the input shaft (3), characterized in that, It also includes a first transmission mechanism and a second transmission mechanism located in the housing (1), two output shafts (5) fixedly connected to the first transmission mechanism and the second transmission mechanism respectively, a kinetic energy recovery mechanism for torque distribution to the first transmission mechanism and the second transmission mechanism, and a temperature control device (6) connected to the kinetic energy recovery mechanism and used to cool the inside of the housing (1).

2. The adjustable torque distribution box for a twin-screw extruder according to claim 1, characterized in that, Both the first and second transmission mechanisms include a passive gear (7) meshing with the driving gear (4), an intermediate shaft (8) concentrically fixedly connected to the passive gear (7), a secondary gear (9) fixedly sleeved on the intermediate shaft (8), and a final gear (10). The output shaft (5) is concentrically fixedly connected to the final gear (10). The first transmission mechanism also includes a reversing gear (11) located between the secondary gear (9) and the final gear (10), which is used to adjust the direction of the two output shafts (5) to be consistent.

3. The adjustable torque distribution box for a twin-screw extruder according to claim 2, characterized in that, The kinetic energy recovery mechanism includes two sleeves (12) rotatably installed inside the housing (1), a transmission component (13) between the two sleeves (12), two movable blocks (14) movably installed inside the two sleeves (12), two return springs (15) fixedly installed between the movable blocks (14) and the transmission component (13) and used to control the position of the movable blocks (14), a clutch disc (16) fixedly connected to the outer ends of the two movable blocks (14), two telescopic components (17) used to drive the two clutch discs (16) to move along the axial direction of the sleeves (12), and a kinetic energy recovery component (18) concentrically fixedly connected to one of the sleeves (12). The kinetic energy recovery component (18) is fixedly installed inside the housing (1). When the telescopic component (17) extends or retracts, the clutch disc (16) is in contact with the driven gear (7). When the driven gear (7) drives the sleeve (12) to rotate, the kinetic energy recovery component (18) generates electrical energy, which is used to power the temperature control (6). The telescopic component (17) is an electric push rod.

4. The adjustable torque distribution box for a twin-screw extruder according to claim 3, characterized in that, The side wall of the box (1) is provided with several through holes that connect its inner cavity and the outside. The temperature control unit (6) includes a plurality of semiconductor cooling chips located in through holes, with the cold end of the semiconductor cooling chips facing the inner cavity of the housing (1).

5. The adjustable torque distribution box for a twin-screw extruder according to claim 4, characterized in that, The housing (1) has a partition (19) for dividing its internal cavity into several parts, and the secondary gear (9) and the final gear (10) are located in the first cavity (20). The first cavity (20) is filled with coolant; The box (1) has circulation channels throughout its entirety, and the two openings of the circulation channels are both located in the first cavity (20); A water pump is fixedly installed in the first chamber (20) and fixedly connected to the kinetic energy recovery component (18). The water pump is fixedly connected to a nozzle (21). The water pump is used to pump the coolant in the first chamber (20) to the circulation channel and then spray it out from the nozzle (21). The coolant sprayed from the nozzle (21) is directed towards the secondary gear (9) and the final gear (10).

6. The adjustable torque distribution box for a twin-screw extruder according to claim 5, characterized in that, The height of the nozzle (21) is higher than the height of the water pump inlet.

7. An adjustable torque distribution box for a twin-screw extruder according to claim 6, characterized in that, Several jetting components (22) for generating water spray are fixedly provided on the inner wall of the box (1).

8. The adjustable torque distribution box for a twin-screw extruder according to claim 7, characterized in that, The jet component (22) is an atomizing cup connected to a compressor, and the opening of the atomizing cup faces the secondary gear (9).

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