A self-compulsory feeding extruder

Abstract

The present invention discloses a self-compulsory feeding extruder, which includes a transmission mechanism, a feeding barrel, a plasticizing barrel, a die head and a screw arranged coaxially. The screw penetrates through the feeding barrel and the plasticizing barrel and is connected to the die head and the transmission mechanism. An upward-opening feeding port is formed on one side of the feeding barrel close to the transmission mechanism. A self-compulsory feeding element is fixed on the feeding barrel to facilitate the smooth entry of the rubber compound into the feeding barrel and block the backflow of the rubber compound. A helical rifling groove is formed inside the feeding barrel to increase the friction between the rubber compound and the feeding barrel and guide the rubber compound to flow towards the die head. The surface of the screw is provided with cutting-type threads, which helps to disperse the rubber compound and improve the uniformity of the rubber compound. Inside the plasticizing barrel, along the direction close to the die head, the pitch of the cutting-type threads gradually decreases to realize the plasticizing treatment of the rubber compound.

Description

Technical Field

[0001] The present invention belongs to the technical field of extruder feeding, and particularly relates to a self-compulsory feeding extruder. Background Art

[0002] Since the rubber extruder came out nearly a hundred years ago, the first method used was free feeding. There was no additional feeding device in the feeding section, and the rubber compound was only brought into the barrel and screw system by the friction generated between the barrel of the feeding section and the matching screw. Due to the influence of the feeding mechanism of friction between the rubber compound and the barrel and screw, the production capacity and stability were greatly limited, which had a great impact on the extrusion efficiency and quality.

[0003] People have been seeking an extrusion device that can forcibly feed materials into the extrusion section: and have successively invented side pressure roller feeding devices, torque feeding devices, and spiral meshing feeding devices. These devices play a positive role in improving production efficiency and the stability of the extrusion process, but these devices generally have complex structures, increasing the difficulty and cost of the mechanical manufacturing process, and at the same time, an active transmission system needs to be added. Moreover, due to the complex structure of the devices, after being used for a period of time, they are prone to failure and blockage, affecting the operation of the entire extruder device and having low reliability. Summary of the Invention

[0004] In view of the above deficiencies, the present invention eliminates the forced feeder using the side pressure roller forced feeding technology, and provides a self-compulsory feeding extruder, which greatly simplifies the mechanical structure of the extruder, improves production efficiency, improves the stability of the extrusion process and the reliability of the extruder, and reduces the manufacturing cost and energy consumption of the extruder.

[0005] The present invention is achieved through the following technical solutions:

[0006] A self-compulsory feeding extruder includes a transmission mechanism, a feeding barrel, a plasticizing barrel, a head, and a screw coaxially arranged. The screw penetrates through the feeding barrel and the plasticizing barrel and is connected to the head and the transmission mechanism. An upward-opening feed port is provided on one side of the feeding barrel close to the transmission mechanism. A self-compulsory feeding element is fixed on the feeding barrel to facilitate the smooth entry of the rubber compound into the feeding barrel and prevent the rubber compound from flowing back. A helical rifling groove is provided inside the feeding barrel to increase the friction between the rubber compound and the feeding barrel and guide the rubber compound to flow towards the head. The surface of the screw is provided with cutting-type threads to help disperse the rubber compound and improve the uniformity of the rubber compound. Inside the plasticizing barrel, along the direction close to the head, the pitch of the cutting-type threads gradually decreases to achieve the plasticizing treatment of the rubber compound.

[0007] Furthermore, the inner diameter of the feed inlet is less than half of the inner diameter of the feeding barrel. On the cross-section of the feeding barrel passing through the axis of the feed inlet, the straight line where one inner wall of the feed inlet is located is tangent to the circle where the inner wall of the feeding barrel is located. A wedge-shaped feeding area is formed between the feed inlet and the screw. The setting of the wedge-shaped feeding area helps the screw convey the rubber compound into the feeding barrel, avoiding the situation of rubber compound staying or blocking at the feed inlet.

[0008] Furthermore, the feeding barrel includes an outer jacket and an inner lining sleeve. The outer jacket and the inner lining sleeve are in interference fit. A flow channel is provided in the outer jacket, and a liquid inlet and a liquid outlet are arranged on the outer side of the outer jacket. The setting of the flow channel in the outer jacket facilitates the adjustment of the temperature of the feeding barrel, realizes the constant temperature on the inner and outer sides of the feeding barrel, and improves the extrusion quality of the rubber compound.

[0009] Furthermore, the self-compelling feeding element includes a bolt body, a screwing part and a semi-hanging body fixed to the bolt body. A thrust inclined plane is provided on the semi-hanging body. The outer jacket is provided with a threaded hole for cooperating with the bolt body, and the semi-hanging body and the inner lining sleeve are in clearance fit. The thrust inclined plane can tear and disperse the rubber compound flowing in from the feed inlet, facilitating the rubber compound to flow into the feeding barrel, and can play a role in preventing the rubber compound from flowing back.

[0010] Furthermore, evenly distributed multi-start helical grooves are provided on the inner side of the inner lining sleeve. There are various types of inner lining sleeves, and the lead angles or the number of starts of the helical grooves of various inner lining sleeves are different. For different types of rubber compounds, the matching type of inner lining sleeve is adopted to ensure the extrusion quality and extrusion efficiency of the rubber compound.

[0011] Furthermore, along the extending direction of the feeding barrel, multiple self-compelling feeding elements are provided, which improves the dividing efficiency and dividing quality of the self-compelling feeding elements for the rubber compound, facilitates the dispersion of the rubber compound, and promotes the rubber compound to flow into the feeding barrel along with the screw. Circumferential grooves for cooperating with the self-compelling feeding elements are provided on the screw to prevent interference or collision between the self-compelling feeding elements protruding from the inner side of the feeding barrel and the screw.

[0012] Furthermore, the cutting-type thread is a triangular thread and a double-start thread, and the depth of the cutting-type thread on the screw is consistent. Inside the feeding barrel, the pitch of the cutting-type thread is equal, which helps the rubber compound to pass through the feeding barrel smoothly.

[0013] Furthermore, a conical outlet is provided at the front end of the head to realize the extrusion molding of the rubber compound. A connecting flange is provided at the rear end of the head. The feeding barrel and the plasticizing barrel have the same diameter, and connecting flanges are provided at both ends of the feeding barrel and the plasticizing barrel, which facilitates the installation and connection of the head, the feeding barrel and the plasticizing barrel.

[0014] Furthermore, the self-force feeding extruder further includes a base, and the transmission mechanism is fixed to the base. A support frame for supporting the feeding barrel and the plasticizing barrel is provided on the base, so as to support the feeding barrel and the plasticizing barrel, facilitating the replacement and maintenance of the feeding barrel and the plasticizing barrel.

[0015] Advantages of the present invention:

[0016] 1. Compared with the side pressure roller forced feeding machine, the present invention omits the active transmission system, greatly simplifies the mechanical structure of the extruder, improves the production efficiency, improves the stability and reliability of the extruder, and the extruder has low use cost and low manufacturing cost;

[0017] 2. The self-force feeding element is installed on the feeding barrel, which facilitates the smooth flow of the rubber compound into the feeding barrel, avoids the retention or blockage of the feeding port of the rubber compound at the feeding port, and the self-force feeding element can also prevent the backflow of the rubber compound;

[0018] 3. A rifled groove is opened on the inner side of the feeding barrel to increase the friction between the rubber compound and the feeding barrel and guide the rubber compound to flow towards the head;

[0019] 4. The surface of the screw is provided with cutting-type threads, which helps to disperse the rubber compound and improve the uniformity of the rubber compound. Description of the drawings

[0020] Figure 1 A connection schematic diagram for illustrating a schematic embodiment of a self-force feeding extruder in the present invention;

[0021] Figure 2 For illustration Figure 1 A partial cross-sectional view at the feeding barrel in

[0022] Figure 3 For illustration Figure 1 Another partial cross-sectional view at the feeding barrel in

[0023] Figure 4 For illustration Figure 3 A partial enlarged schematic view at position A in

[0024] Figure 5 For illustration Figure 3 A cross-sectional schematic view at A-A in

[0025] Figure 6 A structural schematic diagram for illustrating a schematic embodiment of the self-force feeding element of a self-force feeding extruder in the present invention;

[0026] Figure 7 A structural schematic diagram for illustrating a schematic embodiment of the inner liner of a self-force feeding extruder in the present invention;

[0027] Figure 8 To illustrate Figure 7 Schematic diagram of the cross section at BB;

[0028] Figure 9 To illustrate Figure 7 A schematic cross-sectional view of the middle inner liner;

[0029] Figure 10 To illustrate Figure 9 A partial enlarged schematic diagram of point B in the middle;

[0030] Figure 11 A schematic structural diagram of an exemplary embodiment for illustrating a cutaway state of an inner liner of a self-forced feeding extruder in the present invention;

[0031] Figure 12 A schematic structural diagram for illustrating an exemplary embodiment of a screw of a self-forced feeding extruder in the present invention;

[0032] Figure 13 To illustrate Figure 12 Schematic diagram of a partial cross section at CC in the middle.

[0033] List of parts and reference numerals:

[0034] 1. Transmission mechanism; 2. Feeding barrel; 21. Feeding port; 22. Rifling groove; 221. Lead angle; 23. Wedge-shaped feeding area; 25. Outer jacket; 251. Flow channel; 252. Liquid inlet; 253. Liquid outlet; 254. Threaded hole; 26. Inner bushing; 3. Plasticizing barrel; 4. Machine head; 41. Conical outlet; 42. Connecting flange; 5. Screw; 51. Cutting thread; 511. Lead angle; 52. Circumferential groove; 6. Self-forced feeding element; 61. Bolt body; 62. Screwing part; 63. Half-hanging body; 631. Thrust ramp; 7. Base; 71. Support frame. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that the directional terms such as left, right, up, down, front and back in the embodiments of the present invention are merely relative concepts or are based on the normal use state of the product, that is, the direction of movement of the product, and should not be considered as limiting.

[0037] In addition, it should be noted that dynamic terms such as "relative movement" mentioned in the embodiments of the present invention not only refer to changes in position, but also include movements such as rotation and rolling where there is no relative change in position but the state changes.

[0038] Finally, it should be noted that when a component is referred to as "being located on" or "being provided on" another component, it can be on the other component or there may be an intermediate component present at the same time. When a component is referred to as "being connected to" another component, it can be directly connected to the other component or there may be an intermediate component present at the same time.

[0039] As Figures 1 to 13 shown, a self-compulsory feeding extruder includes a transmission mechanism 1, a feeding barrel 2, a plasticizing barrel 3, a head 4, and a screw 5 that are coaxially arranged. The screw 5 passes through the feeding barrel 2 and the plasticizing barrel 3 and is connected to the head 4 and the transmission mechanism 1. An upward-opening feeding port 21 is provided on one side of the feeding barrel 2 close to the transmission mechanism 1. A self-compulsory feeding element 6 is fixed on the feeding barrel 2 to facilitate the smooth entry of the rubber material into the feeding barrel 2 and prevent the rubber material from flowing back. A helical rifling groove 22 is provided inside the feeding barrel 2 to increase the friction between the rubber material and the feeding barrel 2 and guide the rubber material to flow towards the head 4. The surface of the screw 5 is provided with cutting-type threads 51 to help disperse the rubber material and improve the uniformity of the rubber material. Inside the plasticizing barrel 3, along the direction close to the head 4, the pitch of the cutting-type threads 51 gradually decreases to achieve the plasticizing treatment of the rubber material.

[0040] In one embodiment, the working process of the self-compelling feeder is as follows: First, the rubber compound is poured into the feeder from the feed inlet 21, and the rubber compound falls above the screw 5 from the feed inlet 21. The driving mechanism 1 drives the screw 5 to rotate self-driven, so that the screw 5 drives the rubber compound falling into the screw groove to move along the feeder barrel 2 towards the head 4. When the rubber compound is brought between the screw 5 and the feeder barrel 2 by the screw 5, the rubber compound is in small pieces and basically has no viscosity. The self-compelling feeding element 6 fixed on the inner wall of the feeder barrel 2 will tear the rubber compound to achieve the purpose of dispersing the rubber compound, which can effectively improve the uniformity of the rubber compound and facilitate the rubber compound to enter the conveying area between the feeder barrel 2 and the screw 5. When the rubber compound moves along the feeder barrel 2 towards the head 4 under the drive of the screw 5, the rubber compound contacts the rifled groove 22 on the inner side of the feeder barrel 2, which increases the contact area between the rubber compound and the feeder barrel 2, and further increases the frictional force between the rubber compound and the feeder barrel 2. Affected by the lift angle 221 of the rifled groove 22 and the notch structure, when the rubber compound moves along the feeder barrel 2 towards the head 4, the resistance of the rubber compound by the rifled groove 22 is very small, which basically does not affect the movement of the rubber compound along the feeder barrel 2 towards the head 4. The cutting-type thread 51 is arranged on the screw 5, and the cutting property is strong, which is convenient for the cut rubber compound to move along the screw 5 towards the head 4. When the rubber compound flows from the feeder barrel 2 into the plasticizing barrel 3, the pitch of the cutting-type thread 51 in the plasticizing barrel 3 gradually decreases, and the rubber compound is extruded and plasticized, and finally is extruded from the discharge port of the head 4.

[0041] Due to the fact that the pitch of the cutting-type thread 51 in the plasticizing barrel 3 gradually decreases and the head 4 is arranged in a tapered convergence, during the whole process, the rubber compound will be affected by the decrease of the pitch of the cutting-type thread 51 in the plasticizing barrel 3 and the convergence of the head 4, and generate a reverse force, which easily leads to the phenomenon of rubber compound backflow at the feed inlet 21. Especially under the influence of the high-pressure convergence of the head 4, the smaller the discharge port of the head 4 is, the greater the back pressure on the rubber compound is, and the more serious the backflow phenomenon is, which directly affects the working efficiency of the feeding and extruding machine. The present invention increases the frictional force between the rubber compound and the feeder barrel 2 by opening the rifled groove 22 on the inner side of the feeder barrel 2, and the notch orientation of the rifled groove 22 makes the resistance generated by the feeder barrel 2 to the rubber compound backflow much greater than the resistance during the forward flow of the rubber compound, greatly reducing the backflow amount of the rubber compound and realizing the self-compelling feeding of the rubber compound. And when the rubber compound generates backflow, the rubber compound will flow back in the reverse direction to the "weak link" of the feeder, that is, the feed inlet 21. At this time, the self-compelling feeding element 6 located at the feed inlet 21 forcibly holds the backflow rubber compound to block the backflow of the rubber compound, further realizing the forced feeding of the feeder.

[0042] It should be noted that the viscosity of the rubber compound fed into the feed inlet 21 is very low, and the self-compelling feeding element 6 can cut the rubber compound to facilitate the flow of the rubber compound into the feed cylinder 2. After the rubber compound flows through the feed cylinder 2 and into the plasticizing cylinder 3, the rubber compound is plasticized to form a large viscous rubber compound. The self-compelling feeding element 6 can effectively block the plasticized viscous rubber compound, thereby preventing the rubber compound from flowing back. In fact, during the actual production process, after the rubber compound flows into the feed cylinder 2, it is subjected to the reverse force of the rubber compound in the plasticizing cylinder 3, and the rubber compound just flowing into the feed cylinder 2 will be preliminarily plasticized.

[0043] In one embodiment, the transmission mechanism 1 is fixedly connected to the feed cylinder 2, and the transmission mechanism 1 is in transmission connection with the screw 5. The transmission mechanism 1 is a motor. The transmission mechanism 1 is an existing mechanism, and the structure and operation mode of the transmission mechanism 1 will not be described in detail. It should be noted that the transmission mechanism 1 also includes structures such as a reducer and a transmission shaft connected to the motor.

[0044] In one embodiment, the transmission mechanism 1 can be selected as a double enveloping hourglass worm gearing transmission system.

[0045] Preferably, the inner diameter of the feed inlet 21 is less than half of the inner diameter of the feed cylinder 2. On the cross-section of the feed cylinder 2 passing through the axis of the feed inlet 21, the straight line where one inner wall of the feed inlet 21 is located is tangent to the circle where the inner wall of the feed cylinder 2 is located, and a wedge-shaped feeding area 23 is formed between the feed inlet 21 and the screw 5. The setting of the wedge-shaped feeding area 23 helps the screw 5 to convey the rubber compound into the feed cylinder 2 and avoid the situation of rubber compound retention or blockage at the feed inlet 21.

[0046] In one embodiment, as Figure 5 shown, after the rubber compound raw material is fed into the feed inlet 21, the rubber compound falls into the wedge-shaped feeding area 23 between the feed inlet 21 and the screw 5. The rubber compound located in the wedge-shaped feeding area 23 contacts the outer wall of the screw 5 and the inner wall of the feed cylinder 2 respectively. Since the contact area between the rubber compound located in the wedge-shaped feeding area 23 and the outer wall of the screw 5 is larger than the contact area with the inner wall of the feed cylinder 2, the friction between the rubber compound and the screw 5 is greater than the friction between the rubber compound and the inner wall of the feed cylinder 2. Coupled with the fact that the self-weight of the rubber compound mainly acts on the screw 5, the screw 5 helps to bring the rubber compound into the conveying area in the feed cylinder 2, eliminating the phenomenon of rubber compound retention or blockage in the conventional feeding method.

[0047] In one embodiment, the outer wall of the screw 5 is coated with a rubber-friendly coating, and the inner wall of the feed cylinder 2 at the feed inlet 21 is coated with a rubber-repellent coating, thereby increasing the difference in friction between the rubber compound and the screw 5 and between the rubber compound and the feed cylinder 2 in the wedge-shaped feeding area 23, and facilitating the flow of the rubber compound into the conveying area in the feed cylinder 2.

[0048] Preferably, the feeding barrel 2 includes an outer jacket 25 and an inner lining sleeve 26. The outer jacket 25 and the inner lining sleeve 26 are in interference fit. A flow channel 251 is provided inside the outer jacket 25, and a liquid inlet 252 and a liquid outlet 253 are provided on the outer side of the outer jacket 25. The provision of the flow channel 251 inside the outer jacket 25 facilitates the adjustment of the temperature of the feeding barrel 2, realizes the constant temperature on the inner and outer sides of the feeding barrel 2, and improves the extrusion quality of the rubber compound.

[0049] In one embodiment, when extruding and molding the rubber compound, generally, it is necessary to ensure that the temperature of the rubber compound is basically the same as the external temperature. When the rubber compound moves in the feeding barrel 2 and the plasticizing barrel 3, the temperature of the rubber compound rises. As a result, when the rubber compound is extruded and molded, the ambient temperature where the rubber compound is located is higher than the external temperature. To reduce the ambient temperature during the extrusion of the rubber compound, a flow channel 251 is provided on the inner side of the outer jacket 25 of the feeding mechanism, and an external water pump is provided on the outside of the feeding machine. The pipeline is connected to the liquid inlet 252 and the liquid outlet 253 of the outer jacket 25 to form a circulation pipeline. The water pump provides the flowing power for the liquid in the circulation pipeline. The flowing of the liquid accelerates the heat exchange between the feeding barrel 2 and the outside, realizing the temperature control of the extrusion environment of the rubber compound.

[0050] In one embodiment, the liquid in the flow channel 251 is water, oil, or a liquid with good thermal conductivity.

[0051] In one embodiment, on the circulation pipeline communicating with the flow channel 251, a refrigeration or heating device can be provided to heat or refrigerate the liquid in the circulation pipeline, realizing the temperature adjustment of the feeding barrel 2, and facilitating the adjustment of the extrusion environment temperature of the rubber compound to the temperature required for the rubber compound.

[0052] Preferably, the self - forcing feeding element 6 includes a bolt body 61, a screwing part 62 and a semi - hanging body 63 fixed to the bolt body 61. A thrust inclined plane 631 is provided on the semi - hanging body 63. The outer jacket 25 is provided with a threaded hole 254 for fitting with the bolt body 61. The semi - hanging body 63 and the inner lining sleeve 26 are in clearance fit. The thrust inclined plane 631 can tear and disperse the rubber compound flowing in from the feeding port 21, facilitating the rubber compound to flow into the feeding barrel 2 and playing a role in preventing the rubber compound from flowing back.

[0053] In one embodiment, when installing the self - forcing feeding element 6, the self - forcing feeding element 6 is inserted into the feeding barrel 2 from the outside of the feeding barrel 2 towards the inside of the feeding barrel 2, so that the self - forcing feeding element 6 is inserted into the threaded hole 254 of the outer jacket 25. A screwing device such as a wrench or a screwdriver is used to cooperate with the screwing part 62 to screw the bolt body 61 into the threaded hole 254. At this time, the semi - hanging body 63 also inserts into the inner lining sleeve 26, and the semi - hanging body 63 and the inner lining sleeve 26 are in clearance fit to adjust the dimensional floating caused by assembly and barrel thermal expansion. The thrust inclined plane 631 points to the rubber compound flowing in from the feeding port 21, realizing the tearing and dispersion of the rubber compound flowing in from the feeding port 21.

[0054] In one embodiment, when the self-compelling feeding element 6 cooperates with the inner lining 26 of the feeding barrel 2, there is a certain clearance allowance. The self-compelling feeding element 6 is threadedly connected to the outer jacket 25, and a copper sheet is also provided at the connection between the self-compelling feeding element 6 and the outer jacket 25 to improve the sealing performance of the connection between the self-compelling feeding element 6 and the outer jacket 25.

[0055] Preferably, evenly distributed multi-start lead screw grooves 22 are formed on the inner side of the inner lining 26. The inner lining 26 has various types, and the lead angles 221 of the lead screw grooves 22 of various inner linings 26 are different or the number of starts of the lead screw grooves 22 of various inner linings 26 is different. For different types of rubber compounds, the matching type of inner lining 26 is adopted to ensure the extrusion quality and extrusion efficiency of the rubber compounds.

[0056] In one embodiment, the appropriate inner lining 26 can be selected according to the Mooney viscosity and formulation of different rubber compounds to improve the quality of the rubber compound extrusion molding.

[0057] Preferably, along the extending direction of the feeding barrel 2, a plurality of self-compelling feeding elements 6 are provided, which improves the dividing efficiency and dividing quality of the self-compelling feeding elements 6 for the rubber compound, facilitates the dispersion of the rubber compound, and promotes the rubber compound to flow into the feeding barrel 2 along with the screw 5. Circumferential grooves 52 are formed on the screw 5 to cooperate with the self-compelling feeding elements 6, preventing interference or collision between the self-compelling feeding elements 6 protruding from the inner side of the feeding barrel 2 and the screw 5.

[0058] In one embodiment, as Figure 2 shown, along the extending direction of the feeding barrel 2, 4 self-compelling feeding elements 6 are provided. It should be noted that not only are a plurality of self-compelling feeding elements 6 arranged along the extending direction of the feeding barrel 2, but also a plurality of self-compelling feeding elements 6 are arranged in the circumferential direction of the feeding barrel 2, giving full play to the role of the self-compelling feeding elements 6, that is, tearing the rubber compound flowing into the feeding barrel 2 to facilitate the rubber compound to flow into the feeding barrel 2; holding back the flowing-back rubber compound to prevent the rubber compound from flowing back.

[0059] Preferably, the cutting-type thread 51 is a triangular thread and a double-start thread, and the depths of the cutting-type threads 51 on the screw 5 are the same. Inside the feeding barrel 2, the pitches of the cutting-type threads 51 are equal, which helps the rubber compound to pass through the feeding barrel 2 smoothly.

[0060] In one embodiment, when the cutting-type thread 51 is a triangular thread, the screw 5 can more easily "bite" the rubber compound into the thread groove, facilitating the rubber compound at the feeding port 21 to flow into the feeding barrel 2.

[0061] In one embodiment, only the cutting-type thread 51 inside the feeding barrel 2 is a triangular thread, and the cutting-type thread 51 inside the plasticizing barrel 3 is a normal thread.

[0062] Preferably, a conical outlet 41 is provided at the front end of the head 4 to achieve the extrusion molding of the rubber compound. A connecting flange 42 is provided at the rear end of the head 4. The feeding barrel 2 and the plasticizing barrel 3 have the same diameter, and connecting flanges 42 are provided at both ends of the feeding barrel 2 and the plasticizing barrel 3, facilitating the installation and connection of the head 4, the feeding barrel 2, and the plasticizing barrel 3.

[0063] In one embodiment, the connecting flanges 42 on the head 4, the feeding barrel 2, and the plasticizing barrel 3 have the same model, facilitating the mutual connection of the three. And a connecting flange 42 matching the feeding barrel 2 is provided on the transmission mechanism 1.

[0064] Preferably, the self - forced feeding extruder further includes a base 7. The transmission mechanism 1 is fixed to the base 7, and a support frame 71 for supporting the feeding barrel 2 and the plasticizing barrel 3 is provided on the base 7, realizing the support for the feeding barrel 2 and the plasticizing barrel 3 and facilitating the replacement and maintenance of the feeding barrel 2 and the plasticizing barrel 3.

[0065] In one embodiment, the base 7 is selected as a profiled steel structure base 7 and is made by welding. Buffer protection pads are provided between the support frame 71 and the feeding barrel 2 and between the support frame 71 and the plasticizing barrel 3.

[0066] When the above - mentioned self - forced feeding extruder is adopted, the mechanical structure of the extruder is greatly simplified, the production efficiency is improved, the stability of the extrusion process and the reliability of the extruder are improved, and the manufacturing cost and energy consumption of the extruder are reduced.

[0067] The above description is only for the embodiments of the present application and is not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A self-compulsory feeding extruder, characterized in that, It includes a transmission mechanism, a feeding barrel, a plasticizing barrel, a die head and a screw rod which are coaxially arranged. The screw rod penetrates through the feeding barrel and the plasticizing barrel and is connected to the die head and the transmission mechanism. An upward-opening feed inlet is provided on one side of the feeding barrel close to the transmission mechanism. A self-compulsory feeding element is fixed on the feeding barrel. A helical rifling groove is provided on the inner side of the feeding barrel. A cutting-type thread is provided on the surface of the screw rod. Inside the plasticizing barrel, along the direction close to the die head, the pitch of the cutting-type thread gradually decreases; The inner diameter of the feed inlet is less than half of the inner diameter of the feeding barrel. On the cross-section of the feeding barrel passing through the axis of the feed inlet, the straight line where one inner wall of the feed inlet is located is tangent to the circle where the inner wall of the feeding barrel is located. A wedge-shaped feeding area is formed between the feed inlet and the screw rod; Along the extending direction of the feeding barrel, a plurality of the self-compulsory feeding elements are provided. Circumferential grooves which are matched with the self-compulsory feeding elements are provided on the screw rod; The feeding barrel includes an outer jacket and a lining sleeve. The outer jacket and the lining sleeve are in interference fit. A flow channel is provided inside the outer jacket. An inlet and an outlet are provided on the outer side of the outer jacket; The self-compulsory feeding element includes a bolt body, a screwing part and a semi-hanging body which are fixed to the bolt body. A thrust inclined surface is provided on the semi-hanging body. A threaded hole which is matched with the bolt body is provided on the outer jacket. The semi-hanging body and the lining sleeve are in clearance fit.

2. The self-compulsory feeding extruder according to claim 1, wherein, A plurality of multi-start rifling grooves which are evenly distributed are provided on the inner side of the lining sleeve. The lining sleeve has multiple types. The lead angles of the rifling grooves of various lining sleeves are different or the number of starts of the rifling grooves of various lining sleeves is different.

3. The self-compulsory feeding extruder according to claim 1, characterized in that, The cutting-type thread is a triangular thread and is a double-start thread. The depth of the cutting-type thread on the screw rod is consistent. Inside the feeding barrel, the pitch of the cutting-type thread is equal.

4. The self-compulsory feeding extruder according to claim 1, characterized in that, A conical outlet is provided at the front end of the die head. A connecting flange is provided at the rear end of the die head. The feeding barrel and the plasticizing barrel have the same diameter. Connecting flanges are provided at both ends of the feeding barrel and the plasticizing barrel.

5. The self-compulsory feeding extruder according to claim 1, characterized in that It further includes a base. The transmission mechanism is fixed to the base. A support frame for supporting the feeding barrel and the plasticizing barrel is provided on the base.

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