Twin-screw extruder with pressure self-adaptive adjusting spray head

Abstract

The invention relates to the technical field of nozzles, and discloses a double-screw extruder with a pressure self-adaptive adjusting nozzle, the double-screw extruder comprises an extruder body, and the discharge end of the extruder body is fixedly connected with a discharge pipe; the spray head main body is connected with the discharging pipe through a limiting assembly arranged on the outer surface of the circumference of the spray head main body, a guide part used for assisting installation of the spray head main body is arranged on the side, close to the discharging pipe, of the interior of the spray head main body, the limiting assembly comprises a limiting block, and the limiting block is fixedly connected to the outer surface of the circumference of the discharging pipe. According to the double-screw extruder with the pressure self-adaptive adjusting spray head, the problems that in the prior art, in the preheating process of the spray head, the thermal stress change in the spray head enables the connecting part of the spray head and the double-screw extruder to generate relative displacement, then a gap is formed, material leakage is caused, the amount of materials actually entering the spray head is unstable, and the material quality is influenced can be effectively solved. And the product quality is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of nozzles, and in particular to a twin-screw extruder equipped with a pressure self-adapting nozzle. Background Art

[0002] Twin-screw extruder is a kind of mechanical equipment widely used in many fields such as plastic processing, food processing and chemical industry. The material is added into the barrel from the feeding system. Under the push of the rotating twin screws, the material will move forward. In this process, the material is squeezed, sheared and mixed by the screw. With the heating of the heating system, the material gradually melts and plasticizes. The molten material is transported to the nozzle for discharge, cooled and formed by the mold, and finally the desired product is obtained.

[0003] When installing the nozzle, the staff needs to align the nozzle connection pipe with the discharge pipe of the twin-screw extruder to ensure that the central axes of the two are basically coincident, and then tighten the connection bolts evenly according to the specified torque value and tightening sequence to complete the installation of the nozzle. Due to the high installation requirements of the nozzle, improper operation will affect the locking degree between the nozzle and the twin-screw extruder, and during the nozzle preheating process, the change of internal thermal stress will cause relative displacement of the connection between the nozzle and the twin-screw extruder, thereby forming a gap, causing material leakage, resulting in instability in the actual amount of material entering the nozzle, and reducing product quality. Summary of the invention

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a twin-screw extruder equipped with a pressure-adaptive regulating nozzle, which can effectively solve the problem in the prior art that during the preheating process of the nozzle, the changes in the internal thermal stress will cause relative displacement of the connection between the nozzle and the twin-screw extruder, thereby forming a gap, causing material leakage, resulting in instability in the actual amount of material entering the nozzle, and reducing product quality.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a twin-screw extruder equipped with a pressure adaptive regulating nozzle, comprising:

[0008] An extruder body, wherein a discharge end of the extruder body is fixedly connected to a discharge pipe;

[0009] A nozzle body, wherein the nozzle body is connected to the discharge pipe via a limiter assembly arranged on the outer circumferential surface thereof, and a sealing gasket is arranged on a side of the nozzle body close to the discharge pipe;

[0010] Wherein, a guide piece for assisting the installation of the nozzle body is provided on one side of the nozzle body near the discharge pipe;

[0011] Among them, the limit assembly includes a limit block, which is fixedly connected to the circumferential outer surface of the discharge pipe. The limit blocks are provided in multiple numbers and distributed in a circumferential array along the central axis of the discharge pipe. A limit hole is provided inside the limit block. The circumferential outer surface of the nozzle body is fixedly connected with a guide block, and the guide block is slidably connected with a limit plate that slides with the inner wall of the limit hole through a groove hole provided inside the guide block, and a locking part for locking the limit plate is provided inside the limit plate. The circumferential outer surface of the nozzle body is provided with an adjusting part for moving the limit plate.

[0012] Furthermore, a main channel and a discharge channel are provided in the nozzle body, and the main channel and the discharge channel are of integrated design, the main channel includes a tapered section, a throat and a gradually expanding section, and the tapered section is connected to the discharge pipe.

[0013] Furthermore, the guide member includes a guide rod, three of which are provided and distributed in a circular array along the central axis of the nozzle body, the guide rod is detachably installed on the side of the nozzle body close to the discharge pipe, an installation groove is opened inside the guide rod, and a plurality of the installation grooves are provided and distributed in a circular array along the central axis of the guide rod, and the installation groove is slidably connected to a movable block through an elastic member arranged inside the guide rod.

[0014] Furthermore, the discharge pipe is fixedly connected to a guide sleeve via a notch provided inside the discharge pipe, and a conical pipe and a round pipe are provided inside the guide sleeve, and the diameter of the round pipe is the same as the diameter of the guide rod.

[0015] Furthermore, the adjusting member includes a rotating ring, which is threadedly connected to the circumferential outer surface of the nozzle body, and the rotating ring is rotatably connected to a ring that slides with the circumferential outer surface of the nozzle body on the side close to the discharge pipe, and the ring is fixedly connected to the surface of the limit plate on the side away from the rotating ring.

[0016] Furthermore, the locking member includes a guide groove, which is opened on both sides of the limit plate, and the guide groove is provided with a plurality of guide grooves and distributed along the center array of the limit plate. The guide groove is slidably connected with a clamping block through a strong spring arranged inside it, and a locking hole is opened in the middle part of the limit plate, and the locking hole is provided with a plurality of guide grooves and distributed along the center array of the limit plate.

[0017] Furthermore, a protrusion is fixedly connected to the upper surface of the limit block, and a cavity is provided in the protrusion. The limit block is slidably connected to a locking block that slides with the inner wall of the locking hole through a through hole opened on its upper surface, and the cavity is fixedly connected to the surface of the locking block through an elastic plate arranged inside it.

[0018] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0019] The present invention is provided with a limiting assembly. When the nozzle body is preheated, the deformation of the elastic plate due to the high temperature will drive the locking block to be inserted into the locking hole. Since the locking hole is provided with an inclined surface abutting against the locking block, when the locking block moves downward, the inclined surface on the locking block will contact the inclined surface in the locking hole, and generate a horizontal component force to push the limiting plate to produce a short-distance displacement, so that the nozzle body is close to the discharge pipe, and can automatically compensate for the dimensional change of the nozzle caused by thermal expansion. This ensures that under high-temperature working conditions, the nozzle body and the discharge pipe always maintain a close fit, effectively prevents material leakage, and improves the reliability of sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the three-dimensional separation structure of the discharge pipe, the nozzle body and the limit assembly according to an embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional separation structure of the limiting component according to an embodiment of the present invention;

[0024] Figure 4 For the embodiment of the present invention Figure 3 A schematic diagram of the structure enlargement in the middle;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the nozzle body according to an embodiment of the present invention;

[0026] Figure 6 For the embodiment of the present invention Figure 5 A magnified schematic diagram of the structure at B in the middle;

[0027] Figure 7 For the embodiment of the present invention Figure 5 A magnified schematic diagram of the structure at C in the middle;

[0028] Figure 8 It is a structural schematic diagram of the transformation of the use status of the discharge pipe and the nozzle body in an embodiment of the present invention.

[0029] The numbers in the figure represent: 1. Extruder body; 2. Discharge pipe; 3. Nozzle body; 31. Limiting assembly; 311. Limiting block; 312. Limiting hole; 313. Guide block; 314. Limiting plate; 315. Locking piece; 3151. Guide groove; 3152. Strong spring; 3153. Block; 3154. Locking hole; 3155. Protrusion; 3156. Cavity; 3157. Locking block; 3158. Elastic plate; 316. Adjusting piece; 3161. Rotating ring; 3162. Sleeve; 32. Guide piece; 321. Guide rod; 322. Mounting groove; 323. Movable block; 324. Guide sleeve; 33. Main channel; 34. Discharge channel; 4. Sealing pad. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0031] The present invention will be further described below in conjunction with the embodiments.

[0032] Example:

[0033] See also Figure 1-Figure 8 The present invention provides a technical solution: a twin-screw extruder equipped with a pressure adaptive regulating nozzle, comprising:

[0034] An extruder body 1, a discharge end of the extruder body 1 is fixedly connected to a discharge pipe 2;

[0035] A nozzle body 3, which is connected to the discharge pipe 2 via a stopper assembly 31 disposed on its outer circumferential surface, and a sealing gasket 4 is disposed on the side of the nozzle body 3 close to the discharge pipe 2;

[0036] Among them, a guide member 32 for assisting the installation of the nozzle body 3 is provided on one side of the nozzle body 3 near the discharge pipe 2;

[0037] Among them, the limit assembly 31 includes a limit block 311, which is fixedly connected to the circumferential outer surface of the discharge pipe 2. A plurality of limit blocks 311 are arranged and distributed in a circumferential array along the central axis of the discharge pipe 2. A limit hole 312 is opened inside the limit block 311. A guide block 313 is fixedly connected to the circumferential outer surface of the nozzle body 3, and the guide block 313 is slidably connected to a limit plate 314 that slides with the inner wall of the limit hole 312 through a groove hole opened inside the guide block 313, and a locking piece 315 for locking the limit plate 314 is arranged inside the limit plate 314, and an adjusting piece 316 for moving the limit plate 314 is arranged on the circumferential outer surface of the nozzle body 3.

[0038] A main flow channel 33 and a discharge channel 34 are provided in the nozzle body 3 , and the main flow channel 33 and the discharge channel 34 are of integrated design. The main flow channel 33 includes a tapered section, a throat and a gradually expanding section, and the tapered section is connected to the discharge pipe 2 .

[0039] The guide member 32 includes a guide rod 321, three of which are arranged in a circular array along the central axis of the nozzle body 3, and the guide rod 321 is detachably mounted on the side of the nozzle body 3 close to the discharge pipe 2, and a mounting groove 322 is provided inside the guide rod 321, and a plurality of mounting grooves 322 are arranged in a circular array along the central axis of the guide rod 321, and the mounting groove 322 is slidably connected to a movable block 323 via an elastic member arranged inside the mounting groove 322.

[0040] The discharge pipe 2 is fixedly connected to the guide sleeve 324 via a notch provided inside the discharge pipe 2 , and a conical pipe and a round pipe are provided inside the guide sleeve 324 , and the diameter of the round pipe is the same as that of the guide rod 321 .

[0041] The adjusting member 316 includes a rotating ring 3161, which is threadedly connected to the circumferential outer surface of the nozzle body 3. The rotating ring 3161 is rotatably connected to the side close to the discharge pipe 2 with a sleeve ring 3162 that slides with the circumferential outer surface of the nozzle body 3, and the sleeve ring 3162 is fixedly connected to the surface of the limiting plate 314 away from the rotating ring 3161.

[0042] The locking member 315 includes a guide groove 3151, which is opened on both sides of the limit plate 314, and the guide groove 3151 is provided with a plurality of guide grooves 3151 and distributed along the center array of the limit plate 314. The guide groove 3151 is slidably connected with a clamping block 3153 through a strong spring 3152 arranged therein. A locking hole 3154 is opened in the middle part of the limit plate 314, and the locking hole 3154 is provided with a plurality of guide grooves 3154 and distributed along the center array of the limit plate 314.

[0043] A protrusion 3155 is fixedly connected to the upper surface of the limit block 311, and a cavity 3156 is provided in the protrusion 3155. The limit block 311 is slidably connected to a locking block 3157 that slides with the inner wall of the locking hole 3154 through a through hole opened on its upper surface. The cavity 3156 is fixedly connected to the surface of the locking block 3157 through an elastic plate 3158 arranged therein.

[0044] The principle and advantages of the twin-screw extruder equipped with a pressure adaptive nozzle:

[0045] First, the staff connects the discharge pipe 2 to the discharge port of the twin-screw extruder through a bolt assembly. After the discharge pipe 2 is installed, the staff successively installs the guide rod 321 and the sealing gasket 4 on the nozzle body 3 (the nozzle body 3 is provided with an annular groove for installing the sealing gasket 4, and the sealing gasket 4 is provided with a hole that fits with the circumferential outer surface of the guide rod 321). At this time, the staff will align the guide rod 321 with the guide sleeve 324 in the discharge pipe 2 and insert it. When the guide rod 321 has not entered the guide sleeve 324, the movable block 323 on the guide rod 321 is not squeezed by external force, and with the elastic member in the mounting groove 322, the movable block 323 can be in the initial position (with the cooperation of the elastic member, the movable block 323 will not be separated from the mounting groove 322 at the initial position, thereby preventing the movable block 323 from being separated from the mounting groove 322 during use, causing it to be unable to move normally, causing the guide rod 321 to be unable to be smoothly inserted into the guide sleeve 324, affecting the installation accuracy between the discharge pipe 2 and the nozzle body 3), so that the movable block 323 on each guide rod 321 can be in an outward expansion state.

[0046] When the guide rod 321 enters the guide sleeve 324, the movable block 323 first contacts the tapered tube. As the staff continues to move, due to the gradual change of the diameter of the tapered tube, the diameter of the tube near the guide rod 321 is the largest, and the diameter of the tube away from the guide rod 321 is the smallest, and the smallest diameter is the same as the diameter of the round tube and the guide rod 321, so that the closer the movable block 323 is to the round tube, the greater the degree of compression of the movable block 323 by the inner wall of the tapered tube. When the movable block 323 is compressed by the inner wall of the tapered tube, the movable block 323 will compress the elastic member and move into the mounting groove 322 until the movable block 323 moves to the position of the round tube. At this time, the movable block 323 will form a "circular ring" with the same diameter as the guide rod 321, and the "circular ring" will fit with the inner wall of the round tube and continue to move a distance along the round tube.

[0047] It is worth noting that, during the process of the guide rod 321 being inserted into the guide sleeve 324, the squeezing action of the inner wall of the tapered tube on the movable block 323 will generate a centripetal force, which will cause the guide rod 321 to automatically adjust its position so that its central axis gradually coincides with the central axis of the sleeve. When the movable block 323 finally forms a "circular ring" with the same diameter as the guide rod 321, the guide rod 321 can be accurately located in the center position of the sleeve, greatly improving the positioning accuracy. Moreover, due to the gradual change in the diameter of the tapered tube, even if the guide rod 321 has a certain position deviation in the initial stage of insertion, the movable block 323 will continuously adjust the position of the guide rod 321 under the action of the inner wall of the tapered tube, so that it can reach a precise positioning state when approaching the circular tube, reducing the positioning error caused by inaccurate initial position. Multiple guide rods 321 cooperate with guide sleeves 324 (the number of guide rods 321 and guide sleeves 324 can be designed according to actual installation requirements, and three are selected here), so as to achieve the coincidence of the central axis of the discharge pipe 2 and the nozzle body 3, thereby ensuring that the material can enter the flow channel of the nozzle from the discharge pipe 2 at a uniform flow rate and pressure, simplifying the calibration process of the nozzle body 3, and no deliberate adjustment is required by the staff.

[0048] After the guide rod 321 is inserted, the staff rotates the rotating ring 3161 on the outer surface of the circumference of the nozzle body 3. With the cooperation of the thread, the rotating ring 3161 will move along the central axis direction of the nozzle body 3. As the rotating ring 3161 moves, the sleeve ring 3162 drives the limiting plate 314 to move synchronously with the rotating ring 3161. When the limiting plate 314 just enters the limiting hole 312, the block 3153 in the limiting plate 314 will abut against the side wall of the limiting hole 312. As the limiting plate 314 continues to move into the limiting hole 312, the side wall of the limiting hole 312 will squeeze the block 3153 into the guide groove 3151 (the two sides of the block 3153 are pressed together). A slope is provided on the side. When the side wall of the limiting hole 312 contacts the slope, the side wall will squeeze the slope, so that the block 3153 enters the guide groove 3151, preventing the block 3153 from moving the limiting plate 314 normally), and will compress the strong spring 3152 until the block 3153 completely enters the guide groove 3151. When the limiting plate 314 moves a certain distance, one of the blocks 3153 will lose the limitation of the side wall of the limiting hole 312. At this time, the strong spring 3152 will push the block 3153 out of the guide groove 3151, and the plane of the block 3153 will fit with the side wall of the limiting hole 312, thereby realizing the installation and fixation of the nozzle body 3 and the discharge pipe 2.

[0049] It is worth mentioning that the staff uses the rotating ring 3161 to drive the limit plate 314 to move synchronously, so that the sealing surface between the nozzle body 3 and the discharge pipe 2 can be evenly subjected to pressure, so that the sealing gaskets 4 can better fill the sealing gap, thereby improving the sealing of the connection and avoiding the uneven tightening force of the bolts in the traditional installation steps, which leads to excessive or insufficient local pressure on the sealing surface and affects the sealing effect. This is very important for preventing material leakage and ensuring the stability of the extrusion process. At the same time, the rotation installation process is relatively simple and does not require the operator to perform complex adjustments and positioning, which reduces the difficulty and workload of manual operation. This not only improves the installation efficiency, but also reduces the installation errors caused by human factors and improves the stability of the installation quality.

[0050] After the installation of the nozzle body 3 is completed, the staff will preheat the nozzle body 3 and the twin-screw extruder. As the temperature rises, the temperature in the cavity 3156 will gradually increase. At this time, the elastic plate 3158 will be deformed due to the high temperature, thereby pushing the locking block 3157 in the cavity 3156 to move downward to the locking hole 3154. As the locking block 3157 moves, the inclined surface on the locking block 3157 will contact the inclined surface in the locking hole 3154, and generate a horizontal component of force, thereby pushing the limit plate 314 to form a short-distance displacement, and then the nozzle body 3 will produce a short-distance displacement in the direction of the discharge pipe 2 with the cooperation of the limit plate 314, which can dynamically compensate for the gap between the nozzle body 3 and the discharge pipe 2 due to the preheating high temperature, thereby avoiding leakage during use.

[0051] It is worth mentioning that the locking hole 3154 adopts a design of being wide at the top and narrow at the bottom, one of the side walls is designed with a slope, and the other side wall is designed with a straight surface. The "wide part" size of the locking hole 3154 is larger than the size of the locking block 3157, and its "narrow part" size is adapted to the locking block 3157. When the locking block 3157 moves downward, the slope on the locking block 3157 will contact the slope in the locking hole 3154 and generate a horizontal component force to push the limit plate 314 to move a short distance. As the limit plate 314 moves, the locking block 3157 will gradually fit with the straight surface of the locking hole 3154 until the locking block 3157 is inserted into the "narrow part" of the locking hole 3154, thereby completing the locking of the limit plate 314. As the elastic plate 3158 drives the locking block 3157 to cause the limit plate 314 to move a short distance (the elastic plate 3158 can be made of high temperature resistant material. When the elastic plate 3158 is subjected to high temperature, the elastic plate 3158 will be deformed, thereby generating a driving force on the locking block 3157, so that the locking block 3157 can be inserted into the locking hole 3154. When the temperature recovers, the elastic plate 3158 will restore its original shape, so that the locking block 3157 will be separated from the locking hole 3154), the nozzle body 3 will approach the discharge pipe 2, and can automatically adapt to the thermal expansion changes of the nozzle body 3, so that the connection gap between the two will not increase due to thermal expansion, thereby maintaining a good sealing state and preventing material from leaking from the gap.

[0052] After preheating, the extruder body 1 will transport the material to the nozzle body 3 through the discharge pipe 2. At this time, the material will pass through the main channel 33 and the discharge channel 34 in the nozzle body 3 in sequence. Since the main channel 33 is provided with a tapered section, a throat and a gradually expanding section, the molten material first passes through the tapered section, the diameter of the tube gradually decreases, and then reaches the throat with the smallest diameter, and finally passes through the gradually expanding section, the diameter of the tube gradually increases to the discharge channel 34. When the pressure at the tapered section suddenly increases, the flow rate of the material entering the tapered section will be further accelerated under the action of the pressure difference, and the pressure energy will be more converted into kinetic energy, so that the pressure of the throat is further reduced, thereby buffering the increase in the pressure at the inlet. At the same time, in the gradually expanding section, as the flow rate decreases, the pressure gradually recovers, but due to the pressure buffering effect of the tapered section before, the pressure at the discharge channel 34 will not rise as sharply as at the inlet. When the pressure at the inlet suddenly decreases, the flow rate of the fluid entering the tapered section will slow down accordingly. In the tapering section, the degree to which pressure energy is converted into kinetic energy decreases, and the pressure in the throat will not drop too low. Since the flow rate reduction is relatively small, the pressure increase will also be reduced accordingly, so that the pressure at the outlet will not drop too low, thereby compensating for the pressure reduction to a certain extent and realizing adaptive regulation of the pressure. After the production is completed, the nozzle body 3 and the extruder body 1 return to normal temperature, and the elastic plate 3158 will return to its initial shape. At this time, the locking block 3157 will be disengaged from the locking hole 3154 on the limit plate 314, and then the locking block 3157 can be released from the limit plate 314, and then the rotating ring 3161 can be rotated in the opposite direction. At this time, the limit plate 314 will be disengaged from the limit block 311, so that the staff can clean or replace the nozzle body 3, which is beneficial to improve the production efficiency of the twin-screw extruder.

[0053] The present invention adopts the limit assembly 31 and the guide member 32, which has the following advantages:

[0054] Advantage 1: During the process of inserting the guide rod 321 into the guide sleeve 324, the inner wall of the tapered tube in the guide sleeve 324 squeezes the movable block 323 on the guide rod 321, thereby continuously adjusting the position of the guide rod 321 so that it can reach a precise positioning state when approaching the round tube. Multiple guide rods 321 cooperate with the guide sleeve 324 to achieve the coincidence of the central axis of the discharge pipe 2 and the nozzle body 3, thereby simplifying the calibration process of the nozzle body 3 and eliminating the need for deliberate adjustment by the staff.

[0055] Advantage 2: By using the rotating ring 3161 to drive the limit plate 314 to move synchronously, the sealing surface between the nozzle body 3 and the discharge pipe 2 can be evenly pressurized, avoiding the uneven tightening force of the bolts in the traditional installation steps, which may cause the local pressure on the sealing surface to be too high or too low, affecting the sealing effect.

[0056] Advantage three: The disassembly and assembly process of the nozzle body 3 is relatively simple. The structural design of the limit assembly 31 makes the installation process relatively simple. The operator only needs to engage the limit plate 314 in the limit block 311 to complete the initial connection. When the nozzle body 3 needs to be replaced to adapt to different production needs or the nozzle body 3 needs to be cleaned and repaired, the operator can quickly complete the disassembly and reinstallation of the nozzle, reduce equipment downtime, improve production efficiency, reduce operating difficulty, and reduce the requirements for professional skills.

[0057] Advantage four, when the nozzle body 3 is preheated, the deformation of the elastic plate 3158 due to high temperature will drive the locking block 3157 to be inserted into the locking hole 3154. Since the locking hole 3154 is provided with an inclined surface abutting against the locking block 3157, when the locking block 3157 moves downward, the inclined surface on the locking block 3157 will contact the inclined surface in the locking hole 3154, and generate a horizontal component force to push the limit plate 314 to produce a short-distance displacement, so that the nozzle body 3 is close to the discharge pipe 2, and can automatically compensate for the dimensional change of the nozzle due to thermal expansion. This ensures that under high-temperature working conditions, the nozzle body 3 and the discharge pipe 2 always maintain a close fit, effectively preventing material leakage and improving the reliability of sealing.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A twin-screw extruder equipped with a pressure adaptive nozzle, characterized in that: include: An extruder body (1), wherein a discharge end of the extruder body (1) is fixedly connected to a discharge pipe (2); A nozzle body (3), the nozzle body (3) being connected to the discharge pipe (2) via a stopper assembly (31) arranged on the outer circumferential surface thereof, and a sealing gasket (4) being arranged on a side of the nozzle body (3) close to the discharge pipe (2); Wherein, a guide member (32) for assisting the installation of the nozzle body (3) is provided on a side of the nozzle body (3) close to the discharge pipe (2); The limiting assembly (31) comprises a limiting block (311), the limiting block (311) is fixedly connected to the circumferential outer surface of the discharge pipe (2), a plurality of limiting blocks (311) are provided and are distributed in a circumferential array along the central axis of the discharge pipe (2), a limiting hole (312) is provided inside the limiting block (311), the circumferential outer surface of the nozzle body (3) is fixedly connected with a guide block (313), and the guide block (313) is slidably connected with a limiting plate (314) that slides with the inner wall of the limiting hole (312) through a slot hole provided inside the guide block (313), and a locking member (315) for locking the limiting plate (314) is provided inside the limiting plate (314), and an adjusting member (316) for moving the limiting plate (314) is provided on the circumferential outer surface of the nozzle body (3).

2. A twin-screw extruder equipped with a pressure adaptive adjustment nozzle according to claim 1, characterized in that: A main flow channel (33) and a discharge channel (34) are provided in the nozzle body (3), and the main flow channel (33) and the discharge channel (34) are of an integrated design. The main flow channel (33) comprises a tapered section, a throat and a gradually expanding section, and the tapered section is connected to the discharge pipe (2).

3. A twin-screw extruder equipped with a pressure adaptive adjustment nozzle according to claim 1, characterized in that: The guide member (32) comprises a guide rod (321), three of which are arranged in a circular array along the central axis of the nozzle body (3), the guide rod (321) is detachably mounted on a side of the nozzle body (3) close to the discharge pipe (2), a mounting groove (322) is provided inside the guide rod (321), and a plurality of the mounting grooves (322) are arranged in a circular array along the central axis of the guide rod (321), and the mounting groove (322) is slidably connected to a movable block (323) via an elastic member arranged inside the mounting groove (322).

4. A twin-screw extruder equipped with a pressure adaptive regulating nozzle according to claim 1, characterized in that: The discharge pipe (2) is fixedly connected to a guide sleeve (324) via a notch provided inside the discharge pipe (2), and a conical pipe and a round pipe are provided inside the guide sleeve (324), and the diameter of the round pipe is the same as the diameter of the guide rod (321).

5. A twin-screw extruder equipped with a pressure adaptive adjustment nozzle according to claim 1, characterized in that: The adjusting member (316) comprises a rotating ring (3161) which is threadedly connected to the circumferential outer surface of the nozzle body (3); the rotating ring (3161) is rotatably connected to a sleeve (3162) which slides with the circumferential outer surface of the nozzle body (3) on the side close to the discharge pipe (2); and the sleeve (3162) is fixedly connected to the surface of the limiting plate (314) on the side away from the rotating ring (3161).

6. A twin-screw extruder equipped with a pressure adaptive adjustment nozzle according to claim 1, characterized in that: The locking member (315) comprises a guide groove (3151), wherein the guide groove (3151) is provided on both sides of the limiting plate (314), and the guide groove (3151) is provided with a plurality of guide grooves and distributed in an array along the center of the limiting plate (314), and the guide groove (3151) is slidably connected with a clamping block (3153) via a strong spring (3152) provided therein, and a locking hole (3154) is provided in the middle of the limiting plate (314), and the locking hole (3154) is provided with a plurality of guide grooves and distributed in an array along the center of the limiting plate (314).

7. A twin-screw extruder equipped with a pressure adaptive regulating nozzle according to claim 1, characterized in that: A protrusion (3155) is fixedly connected to the upper surface of the limit block (311), and a cavity (3156) is provided in the protrusion (3155); the limit block (311) is slidably connected to a locking block (3157) that slides with the inner wall of the locking hole (3154) via a through hole provided on the upper surface of the limit block (311); the cavity (3156) is fixedly connected to the surface of the locking block (3157) via an elastic plate (3158) provided therein.

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