Screw air compressor for packaging carton production

Abstract

The invention relates to the related technical field of air compressors, discloses a screw air compressor for packaging carton production, and aims to solve the problem that an operator needs to frequently shut down and replace a filter due to the fact that the filter load of the filter is too large due to attachment of oil droplets. An oil-gas mixture entering the oil-gas separation cylinder sequentially passes through the cooling pipe and the oil-gas filter to be purified, when oil gas passes through the cooling pipe, the outer side of the cooling pipe is influenced by a cold flow medium, so that the temperature of the oil gas is reduced, tiny oil drops in the high-temperature oil gas form large oil drops after being cooled, and therefore the gravity settling effect is enhanced. And secondly, when the oil gas filter filters the residual oil gas, the oil gas filter is driven by the motor to continuously rotate, and oil droplets attached to the oil gas filter are separated from the oil gas filter under the action of centrifugal force, so that the attachment of the oil droplets on the oil gas filter is reduced, and finally, the influence of the existence of the oil droplets on the filtering effect of the oil gas filter is reduced.

Description

Technical Field

[0001] This invention relates to the field of air compressor technology, and in particular to a screw air compressor for the production of packaging cartons. Background Technology

[0002] Screw air compressors play a crucial role in the production of cardboard boxes. The production process involves various equipment such as inkjet printing slotting machines, slotting machines, creasing and slitting machines, corner cutting machines, and stapling machines. All of these machines require compressed air as their power source. Screw air compressors can continuously and stably provide compressed air, ensuring the normal operation of each production stage. For example, inkjet printing slotting machines require stable compressed air to control the precision of ink spraying and slotting. Screw air compressors can meet their requirements for air pressure and volume, guaranteeing the quality of printing and slotting.

[0003] Current screw air compressors, when used, involve the following processes:

[0004] Intake process: The motor drives the male rotor to rotate, and the female rotor rotates synchronously with the male rotor through synchronous gears or direct meshing. The helical grooves of the rotors continuously form new spatial volumes during rotation. The pressure at the intake port is lower than the internal pressure of the compressor. Under the action of the pressure difference, the gas is drawn into the inter-tooth volume formed by the male and female rotors. As the rotors continue to rotate, the inter-tooth volume continuously increases, and gas continues to enter until the inter-tooth volume reaches its maximum value.

[0005] Compression process: As the male and female rotors continue to rotate, the inter-tooth volume begins to decrease, trapping the gas within it. Due to the continuously decreasing inter-tooth volume, the gas is compressed, and the pressure and temperature gradually increase. In an oil-injected screw air compressor, lubricating oil is injected into the compression chamber through injection holes, mixing with the high-temperature, high-pressure gas to provide cooling, sealing, lubrication, and noise reduction. The amount of oil injected is controlled by an oil pressure regulating valve.

[0006] Exhaust process: When the inter-tooth volume rotates to the exhaust port position, the gas pressure is higher than the exhaust pipe pressure, and the gas is discharged from the compressor. The exhaust process continues until all the gas in the inter-tooth volume is discharged. In an oil-injected screw air compressor, after the oil-gas mixture is discharged from the compressor, it first enters the oil-gas separator. The separated lubricating oil is cooled and recycled, and the separated compressed air enters the post-processing equipment, such as a dryer.

[0007] During actual operation, the screw rotor generates heat when engaging compressed gas, causing the lubricating oil to vaporize and form an oil-gas mixture, which enters the oil-gas separation system along with the compressed air. Current mainstream oil-gas separation technologies primarily rely on the physical interception and molecular sieve adsorption effects of oil-gas filters (or oil separators). However, continuous filtration leads to an increase in oil droplets adhering to the filter media surface, causing an exponential decline in separation efficiency. Currently, unusable oil-gas filters require replacement after shutdown. However, packaging carton production is mainly an assembly line operation; when the air compressor stops working, the entire production process halts, severely impacting carton production efficiency. Summary of the Invention

[0008] This invention proposes a screw air compressor for use in the production of packaging cartons. This screw air compressor features cold flow cooling and centrifugal oil removal. Its design aims to solve the problem mentioned in the background art where the filter experiences excessive filtration load due to oil droplet adhesion, requiring frequent shutdowns for replacement.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a screw air compressor for packaging carton production, comprising: a frame, wherein a screw compressor unit and an oil-gas separator cylinder are installed inside; the screw compressor unit is used to compress air, and the oil-gas separator cylinder circulates lubricating oil to the screw compressor unit and separates oil and gas; a drain pipe and an air inlet pipe are fixedly installed on the side of the oil-gas separator cylinder, the drain pipe is used to supply lubricating oil to the screw compressor unit, and the air inlet pipe is used to transport the oil-gas mixture generated by the screw compressor unit back to the oil-gas separator cylinder; and a screw air separator cylinder is installed on the top of the oil-gas separator cylinder. It has an oil-gas filter and an exhaust pipe. The oil-gas filter filters the oil and gas, and the exhaust pipe delivers the filtered airflow to the outside. A cooling frame is installed in the middle of the oil-gas separator, and a cooling tube is embedded in the cooling frame. The cooling tube is used to cool the oil-gas mixture. External coolant is delivered to the outside of the cooling tube through a cold flow pipe to cool the cooling tube and the oil-gas mixture inside it. When the high-temperature oil-gas mixture passes through the cooling tube, small oil droplets are cooled and agglomerated to form large oil droplets under the cooling effect. The large oil droplets settle under the action of gravity and separate from the airflow.

[0010] Furthermore, a motor is fixedly installed on the top of the oil-gas separator cylinder to drive the oil-gas filter to rotate; the rotation of the oil-gas filter causes the deposited oil to be thrown out and separated.

[0011] Furthermore, a sleeve connected to the drain pipe is fixedly connected to the bottom inner side of the frame, and a movable sleeve that moves upward under the pressure of a push spring is fitted inside the sleeve.

[0012] Furthermore, an auger is fixedly installed on the output shaft of the motor, and the outer side of the auger is slidably connected to the inner side of the hollow sleeve in the middle of the oil-gas separator cylinder.

[0013] Furthermore, a pair of gear rings capable of transmitting torque are fixedly installed at the bottom of the cooling rack and on the output shaft of the motor.

[0014] Furthermore, a resistance-increasing ring groove is provided on the side of the cooling rack, and an elastic push rod is movably installed inside the oil-gas separator cylinder and outside the sleeve. The elastic push rod abuts against the resistance-increasing ring groove to increase the upward resistance of the cooling rack.

[0015] The present invention has the following beneficial effects:

[0016] The screw air compressor provided by this invention, during operation, allows the oil-gas mixture discharged from the compression chamber to enter an oil-gas separator cylinder. Inside the separator cylinder, the oil-gas mixture undergoes purification treatment sequentially through a cooling pipe and an oil-gas filter according to a specific process. As the oil-gas mixture flows through the cooling pipe, the outer side of the cooling pipe is continuously cooled by a cold medium. Its temperature is lower than the temperature of the oil-gas mixture, and through the principle of heat exchange, the temperature of the oil-gas mixture gradually decreases.

[0017] As the temperature of the oil and gas mixture decreases, the initially dispersed micro-droplets undergo physical changes. These micro-droplets gradually aggregate during the cooling process, forming larger droplets. Compared to micro-droplets, these larger droplets exhibit significantly enhanced gravity settling. Under the influence of gravity, the larger droplets separate from the oil-gas mixture more quickly and settle to the bottom of the oil-gas separator. This process effectively reduces the number of oil droplets entering the subsequent oil-gas filter, thereby reducing the filtration burden on the oil-gas filter and extending its service life.

[0018] After initial gravity settling, the remaining oil-gas mixture enters the oil-gas filter for further filtration. At this point, the motor starts operating, driving the oil-gas filter to rotate continuously. The oil droplets adhering to its surface are subjected to centrifugal force. This centrifugal force overcomes the adhesion between the oil droplets and the filter surface, causing the oil droplets to separate from the filter surface. Through this centrifugal oil removal method, the amount of oil droplets adhering to the oil-gas filter is significantly reduced. This not only reduces the risk of oil droplets clogging the filter channels and ensuring the filter's permeability, but also reduces oil droplet contamination of the filter material. Ultimately, this reduces the impact of oil droplets on the filter's filtration efficiency, improving the overall oil-gas separation efficiency and filtration quality of the screw air compressor.

[0019] In summary, the oil-gas separator used in this application can delay the clogging of the oil-gas filter during the carton production line, thereby reducing the frequency of downtime, making the carton production process more continuous, and avoiding the problem of low production efficiency caused by downtime. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, illustrate embodiments of the invention and, together with the specification, serve to explain the principles of the invention.

[0021] The invention will be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0022] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0023] Figure 2 This is a top view of the invention with the top of the frame removed;

[0024] Figure 3 This is a three-dimensional structural diagram of the oil-gas separator cylinder of the present invention;

[0025] Figure 4 This is a schematic diagram of the internal planar structure of the oil-gas separator cylinder of the present invention;

[0026] Figure 5 for Figure 4 Enlarged structural diagram at point E in the middle;

[0027] Figure 6 This is a schematic diagram of the three-dimensional structure of the cooling rack of the present invention;

[0028] Figure 7 This is a schematic diagram showing the position and three-dimensional structure of each component on the motor of the present invention;

[0029] Figure 8 This is a schematic diagram of the position and three-dimensional structure of the movable sleeve of the present invention.

[0030] In the diagram: 1. Frame; 2. Screw compressor unit; 3. Oil-gas separator cylinder; 300. Liquid storage chamber; 301. Filter chamber; 302. Inlet pipe; 303. Drain pipe; 304. Cold flow pipe; 305. Heat dissipation chamber; 306. Exhaust pipe; 4. Oil-gas filter; 5. Motor; 6. Cooling rack; 600. Cooling pipe; 7. Movable sleeve; 700. Push spring; 8. Screw auger; 9. Gear ring; 10. Resistance-increasing ring groove; 11. Elastic push rod. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1, please refer to Figure 1 and Figure 2As can be seen, the frame 1 contains a screw compressor unit 2 and an oil-gas separator cylinder 3, which are fastened together by bolts. The lubricating oil in the oil-gas separator cylinder 3 is transported to the screw compressor unit 2 via an oil pipe. Inside the screw compressor unit 2, air is compressed, and excess lubricating oil, compressed air, and the oil-gas mixture are transported back to the oil-gas separator cylinder 3 via an oil pipe. After oil-gas separation is completed in the oil-gas separator cylinder 3, the compressed air is discharged and used for packaging carton production. The filtered lubricating oil re-enters the screw compressor unit 2 via an oil pipe for lubrication.

[0033] For more details, please refer to [link / reference]. Figure 3 and Figure 4 It can be seen that a cooling rack 6 is movably installed inside the oil-gas separator cylinder 3, combined with... Figure 6 As shown, the cooling frame 6 mainly consists of two piston plates. A sealing treatment, such as a sealing ring, is used between the cooling frame 6 and the oil-gas separation cylinder 3. The area between the inner side of the cooling frame 6 and the inner side of the oil-gas separation cylinder 3 is set as a heat dissipation chamber 305. Cold flow pipes 304 are symmetrically fixedly installed on the side of the oil-gas separation cylinder 3. The cold flow pipes 304 utilize a circulating pump to circulate the cold flow medium within the heat dissipation chamber 305. The cold flow medium is preferably lubricating oil used for lubrication and cooling in the screw compressor unit 2. Multiple cooling pipes 600 are installed at equal angles around the surface of the cooling frame 6. The outer part of the cooling pipe 600 is located in the heat dissipation chamber 305, while the upper and lower ends connect the upper and lower chambers of the cooling frame 6, thus achieving communication between the upper and lower chambers of the cooling frame 6. The advantage of this arrangement is that when the high-temperature oil-gas mixture passes through the cooling pipe 600, the cooling of the cooling pipe 600 by the heat dissipation chamber 305 allows tiny oil droplets to gradually accumulate during the cooling process, forming larger oil droplets. Large oil droplets settle under their own gravity, thus separating the oil from the gas flow.

[0034] like Figure 4 As shown, a liquid storage chamber 300 is formed below the cooling rack 6 and inside the oil-gas separator 3. The liquid storage chamber 300 is used to contain lubricating oil and its high-temperature oil-gas mixture. An air inlet pipe 302 is fixedly installed on the side of the oil-gas separator 3 and in the middle of the liquid storage chamber 300. The air inlet pipe 302 is connected to the output end of the screw compressor unit 2 via an oil pipe, ensuring that compressed air, lubricating oil, and the oil-gas mixture in the screw compressor unit 2 are transported to the liquid storage chamber 300 through the air inlet pipe 302. After entering the liquid storage chamber 300, the lubricating oil settles due to its own gravity and falls directly to the bottom of the liquid storage chamber 300. Figure 4 It can be seen that the oil-gas separator cylinder 3 has a drain pipe 303 fixedly installed on the side of the liquid storage chamber 300. The drain pipe 303 can transport the lubricating oil in the bottom of the liquid storage chamber 300 back to the screw compressor unit 2, thereby cooling, sealing, lubricating and reducing noise of the working parts (such as the rotor) in the screw compressor unit 2.

[0035] The oil-gas mixture in the storage chamber 300 passes through the cooling pipe 600 and is conveyed upwards to the cooling rack 6. As mentioned above, the oil-gas mixture passing through the cooling pipe 600 will have small oil droplets form larger droplets and be separated from the air by gravity. The chamber inside the oil-gas separation cylinder 3 and located above the cooling rack 6 is designated as the filter chamber 301. Figure 4 As can be seen, an oil-gas filter 4 is movably installed inside the oil-gas separator 3 and at the top of the filter chamber 301. When the oil-gas mixture passes through the oil-gas filter 4, it coalesces under van der Waals forces because the filter 4 is preferably made of an oleophilic fiber filter element (such as glass fiber). The pore structure of the filter element causes oil droplets to repeatedly collide and form large droplets, which eventually settle under gravity. Finally, the separated compressed air is discharged outward from the exhaust pipe 306 fixed at the top of the oil-gas separator 3. The compressed air discharged from the exhaust pipe 306 can be used in various equipment in the production of packaging cartons, such as water-based ink printing slotting machines, creasing and slitting machines, corner cutting machines, and carton stapling machines.

[0036] After a period of use, excessive oil will gradually accumulate in the oil-gas filter 4. This oil will build up in the filtration section, affecting the subsequent separation of the oil-gas mixture. To solve this problem, combined with... Figure 3 and Figure 4 As can be seen, a motor 5 is fixedly installed on the top of the oil-gas separator cylinder 3, and the output shaft of the motor 5 is inserted into the oil-gas separator cylinder 3 and coaxially installed with the oil-gas filter 4. When the oil-gas filter 4 separates the oil-gas mixture, the motor 5 starts and drives it to rotate synchronously. The oil deposited on the oil-gas filter 4 will be separated from it by the centrifugal force generated by the rotation, thereby reducing the accumulation of oil on the oil-gas filter 4.

[0037] Example 2 is a further improvement on Example 1. Please refer to Example 1. Figure 4 and Figure 8 As can be seen, a sleeve is fixedly connected to the bottom inner side of the frame 1 within the liquid storage chamber 300, and the sleeve is connected to the drain pipe 303. A movable sleeve 7 is sealed inside the sleeve, and a push spring 700 is provided between the movable sleeve 7 and the sleeve. The movable sleeve 7 moves upwards under the elastic force of the push spring 700 until its top reaches the bottom of the cooling rack 6. In application, the top of the movable sleeve 7 can be sealed with rubber to isolate the inner cavity of the movable sleeve 7 from the liquid storage chamber 300. Regarding the structure of the movable sleeve 7, in application, a convex ring is provided at its top, making the diameter of the top of the movable sleeve 7 larger than its middle diameter. The difference between the two is greater than the diameter of the cooling pipe 600. This ensures that when the movable sleeve 7 reaches the cooling pipe 600, the inner cavity of the movable sleeve 7 cannot be directly connected to the liquid storage chamber 300 via the cooling pipe 600.

[0038] refer to Figure 4 , Figure 6 and Figure 7 As shown, an auger 8 is fixedly installed on the output shaft of the motor 5, located in the liquid storage chamber 300, and the outer side of the auger 8 is slidably connected to the inner side of the hollow sleeve in the middle of the oil-gas separator 3. During normal operation, the air inlet pipe 302 delivers lubricating oil and oil-gas mixture to the liquid storage chamber 300. The lubricating oil will be deposited at the bottom of the liquid storage chamber 300, while the oil-gas mixture will move upward along the cooling pipe 600. Due to the delivery by the auger 8, the lubricating oil and impurities deposited at the bottom of the liquid storage chamber 300 will be delivered to the filter chamber 301. The impurities mainly come from pollutants carried by the external air, metal shavings generated by the friction of the rotor or bearing components, etc. If these impurities are delivered directly to the rotor without treatment, it will not only reduce the lubrication effect, but also aggravate the wear of the rotor. In this embodiment, the lubricating oil is delivered to the top of the cooling rack 6 by the delivery of the auger 8. Afterwards, the lubricating oil in the filter chamber 301 is filtered through the cooling pipe 600. The lubricating oil passing through the cooling pipe 600 not only has its own temperature reduced, but also impurities in the lubricating oil are filtered out, making the lubricating oil discharged from the drain pipe 303 more pure.

[0039] Based on this, combined Figures 4-6 It can be understood that the cooling rack 6, due to the sealing sleeve between it and the oil-gas separator cylinder 3, can reciprocate up and down along the axial direction of the oil-gas separator cylinder 3. Under normal conditions, the push spring 700 pushes the cooling rack 6 upwards to its top limit via the movable sleeve 7. At this point, the top of the cooling rack 6 abuts against the limiting protrusion ring on the inner side of the oil-gas separator cylinder 3, thus limiting the upward height of the cooling rack 6. Correspondingly, gear rings 9 are fixedly installed at the bottom of the cooling rack 6 and on the output shaft of the motor 5. The gear ring 9 on the motor 5 is located below the auger 8. When the cooling rack 6 rises and abuts against the limiting protrusion ring, the two gear rings 9 separate. Similarly, when the cooling rack 6 descends and the two gear rings 9 engage, the transmission of the gear rings 9 can drive the cooling rack 6 to rotate synchronously.

[0040] Furthermore, the cooling rack 6 has a resistance-increasing ring groove 10 on its side. Correspondingly, an elastic push rod 11 is movably installed inside the oil-gas separator 3 and outside the sleeve. The elastic push rod 11 is mainly composed of a spring and a cylindrical rod. The cylindrical rod is always pushed against the resistance-increasing ring groove 10 by the spring. When the cooling rack 6 moves downward and engages with the gear ring 9 for transmission, the cylindrical rod on the elastic push rod 11 will abut against the resistance-increasing ring groove 10, thereby increasing the upward resistance of the resistance-increasing ring groove 10.

[0041] In practical applications, under normal conditions, the push spring 700 pushes the movable sleeve 7 upward, and the movable sleeve 7 pushes the cooling frame 6 against the limiting protrusion ring. At this time, the two toothed rings 9 are in a relatively separated state. When the motor 5 drives the auger 8 to rotate, the cooling frame 6 will not rotate with it. By utilizing the relative rotation between the auger 8 and the cooling frame 6, the lubricating oil in the liquid storage chamber 300 is transported to the filter chamber 301.

[0042] After the intake pipe 302 delivers the lubricating oil and oil-gas mixture to the liquid storage chamber 300, the lubricating oil accumulates at the bottom of the liquid storage chamber 300, while the oil-gas mixture rises and flows through the cooling pipe 600. The auger 8 then delivers the lubricating oil deposited at the bottom of the liquid storage chamber 300 upwards. The lubricating oil is then filtered through the cooling pipe 600 and flows into the movable sleeve 7 and the interior of the sleeve. Finally, the filtered lubricating oil is circulated back into the screw compressor unit 2 through the drain pipe 303.

[0043] Over time, the cooling tube 600 will become clogged, which will cause the lubricating oil in the filter chamber 301 to continue to increase. The lubricating oil and the cooling frame 6 are pressed downward by gravity, causing the cooling frame 6 to move downward, eventually connecting the two toothed rings 9. At the same time, the downward movement of the cooling frame 6 will cause the elastic push rod 11 to abut against the resistance ring groove 10.

[0044] Subsequently, when motor 5 rotates again, the auger 8 and cooling rack 6 will rotate synchronously via the gear ring 9. Since the auger conveying relies on the relative motion between the spiral blades and the cylinder wall to generate axial thrust, when the auger and outer cylinder rotate synchronously at the same speed, there is no relative speed difference between the medium and the spiral blades and cylinder wall, making it impossible to form an effective axial conveying force. Furthermore, the rotation of cooling rack 6 will cause the blocked cooling pipe 600 on movable sleeve 7 to move away from movable sleeve 7. When the blocked cooling pipe 600 enters between filter chamber 301 and liquid storage chamber 300, the oil-gas mixture in liquid storage chamber 300 is pushed upwards, thereby providing a reverse impact to the blockage in cooling pipe 600, achieving the purpose of clearing the blockage through reverse impact.

[0045] As the cooling frame 6 rotates, the connected cooling pipe 600 moves above the movable sleeve 7. Lubricating oil in the filter chamber 301 is then supplied to the movable sleeve 7 via the connected cooling pipe 600. As filtration continues, the amount of lubricating oil in the filter chamber 301 decreases, thus reducing the downward pressure of the cooling frame 6. Finally, when the lubricating oil in the filter chamber 301 decreases, the push spring 700 pushes the cooling frame 6 upward, forcing the elastic push rod 11 to disengage from the resistance ring groove 10. The cooling frame 6 then moves upward again, disengaging the gear rings 9 once more.

[0046] In summary, after the cooling pipe 600 is sealed, the cooling frame 6 can rotate to switch the connected cooling pipe 600 for filtration. Furthermore, to prevent wear and leakage of the seals between the cooling frame 6 and the oil-gas separator 3 due to prolonged rotation, the cooling frame 6 only rotates when normal filtration is impossible, thus reducing rotational wear of the seals. More importantly, since the cooling medium in the cold flow pipe 304 is the same as the lubricating oil in the liquid storage chamber 300, even if the seals on the cooling frame 6 are damaged and the cooling medium enters the liquid storage chamber 300, it only increases the amount of lubricating oil in the liquid storage chamber 300 and does not affect the normal lubrication of the entire machine.

Claims

1. A screw air compressor for producing packaging cartons, characterized in that, include: The frame (1) is equipped with a screw compressor unit (2) and an oil-gas separator cylinder (3); the screw compressor unit (2) is used to compress air, and the oil-gas separator cylinder (3) circulates lubricating oil to the screw compressor unit (2) and separates oil and gas; The oil-gas separator (3) is fixedly installed with a drain pipe (303) and an air inlet pipe (302) on its side. The drain pipe (303) is used to deliver lubricating oil to the screw compressor unit (2), and the air inlet pipe (302) is used to transport the oil-gas mixture generated by the screw compressor unit (2) back to the oil-gas separator (3). The top of the oil-gas separator (3) is equipped with an oil-gas filter (4) and an exhaust pipe (306). The oil-gas filter (4) filters the oil and gas, and the exhaust pipe (306) delivers the filtered airflow to the outside. A cooling rack (6) is installed in the middle of the oil-gas separator (3). A cooling pipe (600) is embedded in the cooling rack (6). The cooling pipe (600) is used to cool the oil-gas mixture. External coolant is transported to the outside of the cooling pipe (600) through the cold flow pipe (304) to cool the cooling pipe (600) and the oil-gas mixture inside it. When the high-temperature oil-gas mixture passes through the cooling pipe (600), small oil droplets cool and aggregate to form large oil droplets under the cooling effect; the large oil droplets settle under the action of gravity and separate from the gas flow.

2. The screw air compressor for producing packaging cartons according to claim 1, characterized in that, The top of the oil-gas separator (3) is fixedly equipped with a motor (5) that drives the oil-gas filter (4) to rotate; the rotation of the oil-gas filter (4) enables the deposited oil to be thrown out and separated.

3. The screw air compressor for producing packaging cartons according to claim 2, characterized in that, The bottom inner side of the frame (1) is fixedly connected to a sleeve that communicates with the drain pipe (303), and the sleeve is sealed with a movable sleeve (7) that moves upward under the action of the push spring (700).

4. The screw air compressor for producing packaging cartons according to claim 3, characterized in that, An auger (8) is fixedly installed on the output shaft of the motor (5), and the outer side of the auger (8) is slidably connected to the inner side of the hollow sleeve in the middle of the oil-gas separator (3).

5. The screw air compressor for producing packaging cartons according to claim 4, characterized in that, A pair of gear rings (9) capable of transmitting torque are fixedly installed on the bottom of the cooling rack (6) and the output shaft of the motor (5).

6. The screw air compressor for producing packaging cartons according to claim 4, characterized in that, The cooling rack (6) has a resistance-increasing ring groove (10) on its side. An elastic push rod (11) is movably installed inside the oil-gas separator (3) and outside the sleeve. The elastic push rod (11) abuts against the resistance-increasing ring groove (10) to increase the upward resistance of the cooling rack (6).

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