Heat pipe type conformal cooling charging barrel structure of cold feed extruder

Abstract

The invention relates to the technical field of rubber forming equipment, and discloses a heat pipe type conformal cooling cold feed extruder charging barrel structure which comprises a charging barrel main body arranged in an extruder, a connecting pipe communicated with the charging barrel main body is arranged in the extruder, the charging barrel main body is provided with a screw rod for conveying raw materials, the screw rod extends into the connecting pipe, and the extruder is in transmission connection with the screw rod through a driving unit arranged in the extruder; wherein the charging barrel body comprises an outer barrel and an inner barrel, the inner barrel is installed on the inner wall of the outer barrel in a damping rotation mode through an annular guide rail arranged on the outer surface of the inner barrel, and a cleaning piece used for cleaning the inner wall of the inner barrel is arranged in the outer barrel. The heat pipe type conformal cooling charging barrel structure of the cold feed extruder can effectively solve the problems that in the prior art, the cleaning work of the inner wall of the charging barrel mostly depends on manual disassembly and cleaning after shutdown, the mode is tedious in operation and consumes time and manpower, and frequent shutdown can generate adverse effects on production continuity.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber molding equipment, and particularly relates to a barrel structure of a cold feed extruder with heat pipe-shaped conformal cooling. Background Art

[0002] As a core device for processing high molecular materials such as rubber and plastics, the performance of the barrel structure of a cold feed extruder directly affects the plasticization quality of raw materials and production efficiency. The barrel of a traditional cold feed extruder usually adopts a fixed barrel structure, and the screw rotates in the barrel to complete the transportation and plasticization of raw materials.

[0003] During the long-term production operation of the extruder, high molecular raw material residues and impurity particles will adhere to the inner wall of the barrel, resulting in material retention and uneven plasticization. In severe cases, it may even cause equipment failures. Currently, the cleaning of the inner wall of the barrel mostly relies on manual disassembly and cleaning after shutdown. This method is not only cumbersome, time-consuming and labor-intensive, but also frequent shutdowns will have an adverse impact on the continuity of production; although some equipment is equipped with an automatic cleaning structure, most of them use an independent drive device, which has problems such as complex structure, high energy consumption and insufficient coordination with the screw movement. Summary of the Invention

[0004] In view of the above-mentioned drawbacks of the prior art, the present invention provides a barrel structure of a cold feed extruder with heat pipe-shaped conformal cooling, which can effectively solve the problem in the prior art that the cleaning of the inner wall of the barrel mostly relies on manual disassembly and cleaning after shutdown. This method is not only cumbersome, time-consuming and labor-intensive, but also frequent shutdowns will have an adverse impact on the continuity of production.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: The present invention provides a barrel structure of a cold feed extruder with heat pipe-shaped conformal cooling, including: A barrel main body disposed inside the extruder; A connecting pipe communicating with the barrel main body is provided inside the extruder. The barrel main body is provided with a screw for transporting raw materials, and the screw extends into the connecting pipe. The extruder is in transmission connection with the screw through a drive unit disposed inside it; Wherein, the barrel main body includes an outer barrel and an inner barrel. The inner barrel is installed on the inner wall of the outer barrel in a damped rotation manner through an annular guide rail provided on its outer surface, and a cleaning member for cleaning the inner wall of the inner barrel is provided inside the outer barrel; Wherein, a linkage member is provided on one side of the screw close to the drive unit. When the drive unit drives the screw to rotate in the reverse direction, the linkage member is triggered to start, and then drives the outer barrel to rotate around the central axis of the inner barrel, and the cleaning member cleans the inner wall of the inner barrel as the outer barrel rotates.

[0006] Furthermore, a hopper connected to an external feeding device is fixedly communicated with the outer surface of the connecting pipe. A discharging pipe is arranged on the circumferential outer surface of the connecting pipe. The discharging pipe is arranged directly below the hopper. An electromagnetic valve is arranged on the outer surface of the discharging pipe. A heating element is detachably installed on the outer surface of the outer cylinder, and a plurality of such heating elements are provided and are arranged in an array along the central axis of the outer cylinder.

[0007] Furthermore, the linkage member includes mounting plates fixedly connected to the ends of the connecting pipe. Two such mounting plates are provided and are symmetrically distributed along the center of the connecting pipe. One mounting plate away from the drive unit is rotatably connected to a sleeve fixedly connected to the outer surface of the outer cylinder through an annular groove opened on its surface. One mounting plate close to the drive unit is rotatably connected to a mounting seat fitting the outer surface of the screw through an annular groove opened on its surface. Tooth rings are fixedly connected to the outer surfaces of the mounting seat and the sleeve respectively.

[0008] Furthermore, the connecting pipe is rotatably connected to a rotating shaft through a bracket provided on its outer surface, and a gear meshing with the tooth ring is fixedly connected to the end of the rotating shaft.

[0009] Furthermore, the screw is rotatably connected to a pawl through a pin shaft provided on its outer surface. Two such pawls are provided and are centrally symmetrically distributed along the central axis of the screw. A ratchet wheel fitting the pawl is fixedly connected inside the mounting seat.

[0010] Furthermore, the cleaning member includes a notch opened on the inner wall of the inner cylinder. A scraping plate is arranged in the notch, and the scraping plate is designed in an arc shape. The scraping plate is detachably installed with a counterweight rod through a mounting hole opened in its interior.

[0011] Furthermore, the outer cylinder is slidably connected to a support plate through a guiding groove opened on its inner wall. Two such support plates are provided and are symmetrically distributed along the center of the outer cylinder. The support plate is connected to the inner wall of the guiding groove through an elastic plate provided at its bottom. The elastic plate is made of a shape memory alloy material.

[0012] Furthermore, the scraping plate is fixedly connected with a mounting shaft penetrating the outside of the support plate through a mounting groove opened on its outer surface. A torsion spring is sleeved on the outer surface of the mounting shaft. Two such torsion springs are provided and are symmetrically distributed along the center of the mounting shaft.

[0013] The technical solution provided by the present invention has the following beneficial effects compared with the prior art: The present invention is provided with a linkage member and a cleaning member. When the barrel body needs to be cleaned, the drive unit drives the screw to rotate in the reverse direction. Through the linkage member, the mounting seat is driven to rotate. Through the transmission between the gear and the gear ring, the outer cylinder rotates around the inner cylinder. The scraper in the outer cylinder generates centrifugal force during rotation. After overcoming the pre-tightening force of the torsion spring, it fits against the inner wall of the inner cylinder, scraping off the attached raw material residues and impurities. During the cleaning process, the axial thrust generated by the reverse rotation of the screw discharges the impurities through the discharge pipe. There is no need to disassemble the barrel body, realizing automatic cleaning of the inner wall of the inner cylinder without stopping the machine for manual operation. Moreover, the linkage member utilizes the reverse rotation kinetic energy of the screw and drives the outer cylinder to rotate through the mechanical transmission between the pawl, ratchet, gear ring, gear, and sleeve without the need for an additional motor or drive device. During normal production, the pawl disengages from the ratchet, and the outer cylinder remains stationary while only the screw rotates. During reverse cleaning, the linkage is automatically triggered, and the inner wall of the inner cylinder is automatically cleaned through the linkage member and the cleaning member, avoiding the cumbersome operation of traditional shutdown and disassembly cleaning, ensuring production continuity. At the same time, the scraper is connected to the support plate through the mounting shaft. When the outer cylinder rotates, the counterweight rod generates centrifugal force as the rotation speed increases. When the centrifugal force exceeds the pre-tightening force of the torsion spring, the scraper rotates around the axis of the mounting shaft, and its shear surface closely fits against the inner wall of the inner cylinder. The higher the rotation speed, the greater the fitting pressure, ensuring that stubborn residues can be effectively scraped off under different working conditions, and the cleaning effect is dynamically adjusted according to requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 It is a front view three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 It is a sectional structural schematic diagram of the barrel body of an embodiment of the present invention; Figure 3 It is a structural schematic diagram of the cleaning member of an embodiment of the present invention; Figure 4 It is a three-dimensional separated structural schematic diagram of the cleaning member of an embodiment of the present invention; Figure 5 For an embodiment of the present invention Figure 4 The structural schematic diagram of the partial enlargement at A in the figure; Figure 6 It is a three-dimensional separated structural schematic diagram of the connecting pipe, mounting plate and linkage member of an embodiment of the present invention; Figure 7 For an embodiment of the present invention Figure 6 The structural schematic diagram of the partial enlargement at B in the figure; Figure 8Schematic diagram of the three-dimensional separation structure of the pawl and the screw in the embodiment of the present invention; Figure 9 Schematic diagram of the three-dimensional state conversion structure of the scraper in the embodiment of the present invention.

[0016] The reference numerals in the figure respectively represent: 1, barrel body; 11, outer cylinder; 12, inner cylinder; 2, connecting pipe; 21, hopper; 22, discharge pipe; 3, screw; 4, drive unit; 5, cleaning member; 51, notch; 52, scraper; 53, counterweight rod; 54, support plate; 55, elastic plate; 56, mounting shaft; 57, torsion spring; 6, linkage member; 61, mounting plate; 62, sleeve; 63, mounting seat; 64, gear ring; 65, rotating shaft; 66, gear; 67, pawl; 68, ratchet wheel. Detailed implementation manners

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] The present invention will be further described below with reference to the embodiments.

[0019] Embodiment:

[0020] Please refer to Figures 1 - 9 , the present invention provides a technical solution: a barrel structure of a cold feed extruder with heat pipe type conformal cooling, including: A barrel body 1 provided inside the extruder; A connecting pipe 2 communicating with the barrel body 1 is provided inside the extruder. A screw 3 for conveying raw materials is provided on the barrel body 1, and the screw 3 extends into the connecting pipe 2. The extruder is drivingly connected to the screw 3 through a drive unit 4 provided inside it; Among them, the barrel body 1 includes an outer cylinder 11 and an inner cylinder 12. The inner cylinder 12 is installed on the inner wall of the outer cylinder 11 in a damped rotation manner through an annular guide rail provided on its outer surface. A cleaning member 5 for cleaning the inner wall of the inner cylinder 12 is provided inside the outer cylinder 11; Among them, a linkage member 6 is provided on one side of the screw 3 close to the drive unit 4. When the drive unit 4 drives the screw 3 to rotate in the reverse direction, the linkage member 6 is triggered to start, and then drives the outer cylinder 11 to rotate around the central axis of the inner cylinder 12, and the cleaning member 5 cleans the inner wall of the inner cylinder 12 as the outer cylinder 11 rotates.

[0021] The outer surface of the connecting pipe 2 is fixedly connected and communicated with a hopper 21 connected to an external feeding device. The outer circumferential surface of the connecting pipe 2 is provided with a discharge pipe 22. The discharge pipe 22 is arranged directly below the hopper 21. An electromagnetic valve is arranged on the outer surface of the discharge pipe 22. The outer surface of the outer cylinder 11 is detachably installed with heating elements, and a plurality of such heating elements are provided and are arranged in an array along the central axis of the outer cylinder 11.

[0022] The linkage member 6 includes mounting plates 61 fixedly connected to the end of the connecting pipe 2, and two such mounting plates 61 are provided and are symmetrically distributed along the center of the connecting pipe 2. One mounting plate 61 away from the drive unit 4 is rotatably connected through an annular groove opened on its surface to a sleeve 62 fixedly connected to the outer surface of the outer cylinder 11. One mounting plate 61 close to the drive unit 4 is rotatably connected through an annular groove opened on its surface to a mounting seat 63 that fits on the outer surface of the screw 3. Tooth rings 64 are fixedly connected to the outer surfaces of the mounting seat 63 and the sleeve 62 respectively.

[0023] The connecting pipe 2 is rotatably connected with a rotating shaft 65 through a bracket provided on its outer surface, and a gear 66 meshing with the tooth ring 64 is fixedly connected to the end of the rotating shaft 65.

[0024] The screw 3 is rotatably connected with a pawl 67 through a pin shaft provided on its outer surface, and two such pawls 67 are provided and are centrally symmetrically distributed along the central axis of the screw 3. A ratchet wheel 68 that fits with the pawl 67 is fixedly connected inside the mounting seat 63.

[0025] The cleaning member 5 includes a notch 51 opened on the inner wall of the inner cylinder 12. A scraper 52 is arranged in the notch 51, and the scraper 52 is designed in an arc shape. The scraper 52 is detachably installed with a counterweight rod 53 through a mounting hole opened in its interior.

[0026] The outer cylinder 11 is slidably connected with a support plate 54 through a guiding groove opened on its inner wall, and two such support plates 54 are provided and are symmetrically distributed along the center of the outer cylinder 11. The support plate 54 is connected to the inner wall of the guiding groove through an elastic plate 55 provided at its bottom, and the elastic plate 55 is made of a shape memory alloy material.

[0027] The scraper 52 is fixedly connected with a mounting shaft 56 penetrating through the outside of the support plate 54 through a mounting groove opened on its outer surface, and torsion springs 57 are sleeved on the outer surface of the mounting shaft 56. Two such torsion springs 57 are provided and are symmetrically distributed along the center of the mounting shaft 56.

[0028] The working principle and advantages of the barrel structure of the hot pipe type conformal cooling cold feed extruder: The preheating process of the barrel body 1: Before the preheating stage before the equipment operation, the operator needs to perform preheating treatment on the barrel body 1 and the screw 3 of the extruder. The temperature rise of the barrel body 1 and the screw 3 is controlled by the heating elements installed on the outer circumferential surface of the outer barrel 11. When the real-time temperature feedback value of the heating system reaches the preset process temperature, the heating elements automatically stop working. At this time, the temperature fields of the inner barrel 12, the outer barrel 11 and the screw 3 all reach the preheating temperature range required by the process.

[0029] When the temperature of the inner barrel 12 rises above the austenite phase transformation start temperature of the shape memory alloy, the elastic plate 55 made of shape memory alloy material at the bottom of the support plate 54 undergoes a martensite-to-austenite phase transformation. As the temperature continues to rise to the austenite phase transformation end temperature, the phase transformation process is completely completed, and the elastic plate 55 returns to its initial solid-phase transformation shape, driving the support plate 54 to generate a directional micro-displacement along the guide groove, prompting the scraper 52 installed on the support plate 54 to precisely fit the notch 51 on the inner wall of the inner barrel 12, thereby constructing a continuous and smooth working surface of the inner barrel 12.

[0030] It should be noted that the elastic plate 55 is made of shape memory alloy material (such as nickel-titanium alloy). In the initial state, the elastic plate 55 is in the martensite phase and undergoes tensile deformation due to temperature drop, thereby driving the support plate 54 to move downward, causing the scraper 52 to disengage from the notch 51, and a gap is formed between the two (facilitating the rotation of the scraper 52 during subsequent cleaning). The scraper 52 is located outside the notch 51 on the inner wall of the inner barrel 12 and does not contact the inner wall of the inner barrel 12. As the heating unit heats the barrel body 1, the temperature of the inner barrel 12 gradually rises. When the temperature reaches the threshold temperature of the elastic plate 55, the elastic plate 55 completely transforms into the austenite phase and returns to the initial set "contracted state" shape, pushing the elastic plate 55 to contract and driving the support plate 54 to move upward slightly (directionally) along the guide groove on the inner wall of the outer barrel 11 until the scraper 52 is embedded in the notch 51 on the inner wall of the inner barrel 12. Thus, it can be realized that the scraper 52 fits the notch 51 at high temperature and does not participate in the movement. At normal temperature, the elastic plate 55 returns to the martensite tensile state, and the scraper 52 disengages from the notch 51, allowing it to swing as the outer barrel 11 rotates, realizing the scraping function.

[0031] After the preheating process is completed, the external material conveying system injects the rubber raw material to be processed into the hopper 21. At this time, the driving unit 4 drives the screw 3 to rotate in the forward direction. Since the ratchet pawl 67 on the outer surface of the screw 3 and the ratchet wheel 68 on the inner wall of the outer barrel 11 are in a non-engaged state, the outer barrel 11 and the inner barrel 12 maintain static positioning. Under the rotational pushing of the screw 3, the raw material gradually enters the plasticizing area of the inner barrel 12 through the feeding section. With the continuous temperature control of the heating elements on the circumferential surface of the outer barrel 11, the raw material is transformed into a molten state under the action of shear and conduction heating. Finally, the molten material is extruded through the forming die connected to the output end of the barrel body 1 under the extrusion pressure of the screw 3, completing the extrusion molding of the rubber product with a predetermined cross-sectional shape.

[0032] It should be noted that the outer cylinder 11 is installed by damping rotation with respect to the inner cylinder 12, and the heating element is fixed inside the extruder. The outer cylinder 11 can rotate within the heating element. When the screw 3 rotates forward and the rubber raw material is being produced normally, the inner cylinder 12 remains relatively stationary under the action of the raw material friction force, ensuring the stable conveying of materials by the screw 3. When the screw 3 rotates in the reverse direction, the outer cylinder 11 rotates against the damping torque, thereby driving the movement of the scraper 52, and achieving the dual purposes of being fixed during production and rotating during cleaning of the outer cylinder 11.

[0033] Cleaning process of the barrel body 1: When it is necessary to clean the barrel body 1, the barrel body 1 is cooled down to the room temperature condition. At this time, the elastic plate 55 made of shape memory alloy material is in a tensile deformation state, and the support plate 54 drives the scraper 52 along the guide groove to disengage from the notch 51, forming a gap with a set distance between the notch 51 and the scraper 52.

[0034] Under this condition, the drive unit 4 drives the screw 3 to perform reverse rotational movement. Through the coordinated action of the ratchet 68 and the pawl 67, in view of the meshing transmission relationship between the gear ring 64 assembled on the circumferential outer surface of the mounting seat 63 and the gear 66, and in cooperation with the linkage of the transmission shaft and another gear 66, the sleeve 62 is driven to drive the outer cylinder 11 to overcome the damping torque between it and the inner cylinder 12, and then the scraper 52 rotates synchronously with the screw 3.

[0035] In the initial rotation stage of the outer cylinder 11, the centrifugal force load is relatively small and has not reached the pre-tightening force threshold of the torsion spring 57 sleeved on the circumferential outer surface of the mounting shaft 56. As the rotational speed of the outer cylinder 11 gradually increases, under the coordinated action of the counterweight rod 53, the centrifugal force received by the scraper 52 gradually increases. When the centrifugal force exceeds the pre-tightening force threshold of the torsion spring 57, the scraper 52 generates a rotational displacement along the central axis of the mounting shaft 56. Since the counterweight rod 53 is arranged at the edge part of the scraper 52, the centrifugal force drives one side of the scraper 52 to form a tightly attached state with the inner wall of the inner cylinder 12. Along with the continuous rotation of the outer cylinder 11, the scraper 52 scrapes and removes the impurities attached to the inner wall of the inner cylinder 12. During the cleaning operation, the solenoid valve on the outer surface of the discharge pipe 22 is pre-opened, and the axial thrust generated by the reverse rotation of the screw 3 is used to "push back" the impurities to the discharge pipe 22 and discharge them from the inner cylinder 12 along the discharge pipe 22. After the cleaning is completed, the solenoid valve is closed to ensure the airtightness of the barrel body 1.

[0036] It should be noted that the inner wall of the connecting pipe 2 on the side close to the plasticizing area is designed with a tapered structure that gradually tapers. This tapered inner wall forms a gradually tapering flow channel cross-section, which reduces the friction coefficient of the impurities during the flow process through fluid mechanics optimization, effectively avoiding the risk of material retention and blockage caused by sudden changes in the flow channel cross-section. Under the condition of the reverse rotation of the screw 3, the tapered structure and the spiral surface of the screw 3 form a cooperative material guiding mechanism. With the help of its geometric convergence characteristics, the axial thrust of the screw 3 is converted into a combined radial and axial thrust, causing the impurities to generate a centripetal convergence effect under the guidance of the conical surface, significantly improving the moving efficiency of the impurities towards the discharge port. In addition, the smooth transition surface of the tapered inner wall can also prevent the deposition of impurities caused by traditional right-angle transitions, affecting the normal discharge of impurities from the inner barrel.

[0037] The present invention adopts the linkage member 6 and the cleaning member 5, which have the following advantages: Advantage 1: When the barrel body 1 needs to be cleaned, the driving unit 4 drives the screw 3 to rotate in the reverse direction. Through the linkage member 6, the mounting seat 63 is driven to rotate. Through the transmission between the gear 66 and the gear ring 64, the outer cylinder 11 rotates around the inner cylinder 12. The scraper 52 in the outer cylinder 11 generates a centrifugal force during rotation. After overcoming the pre-tightening force of the torsion spring 57, it fits against the inner wall of the inner cylinder 12, scraping off the attached raw material residues and impurities. During the cleaning process, the axial thrust generated by the reverse rotation of the screw 3 discharges the impurities through the discharge pipe 22, without the need to disassemble the barrel body 1, realizing the automatic cleaning of the inner wall of the inner cylinder 12 without manual operation during shutdown.

[0038] Advantage 2: The linkage member 6 utilizes the reverse rotation kinetic energy of the screw 3 to drive the rotation of the outer cylinder 11 through the mechanical transmission between the pawl 67, the ratchet wheel 68, the gear ring 64, the gear 66, and the sleeve 62, without the need for an additional motor or driving device. During normal production, the pawl 67 is disengaged from the ratchet wheel 68, and the outer cylinder 11 is stationary, only the screw 3 rotates. During reverse cleaning, the linkage is automatically triggered, and the inner wall of the inner cylinder 12 is automatically cleaned through the linkage member 6 and the cleaning member 5, avoiding the cumbersome operation of traditional shutdown and disassembly cleaning, and ensuring the continuity of production.

[0039] Advantage 3: The centrifugal force adapts to fit, and the cleaning effect is efficient and stable. The scraper 52 is connected to the support plate 54 through the mounting shaft 56. When the outer cylinder 11 rotates, the counterweight rod 53 generates a centrifugal force as the rotation speed increases. When the centrifugal force exceeds the pre-tightening force of the torsion spring 57, the scraper 52 rotates around the axis of the mounting shaft 56, and its shear surface closely fits against the inner wall of the inner cylinder 12. The higher the rotation speed, the greater the fitting pressure, ensuring that stubborn residues can be effectively scraped off under different working conditions, and the cleaning effect can be dynamically adjusted according to requirements.

[0040] Advantage 4: The shape memory alloy elastic plate 55 automatically adjusts the position of the scraping plate 52. During the preheating stage, the heating element of the outer cylinder 11 heats up, causing the temperature of the inner cylinder 12 to rise. The shape memory alloy elastic plate 55 at the bottom of the support plate 54 (martensite → austenite phase transformation) restores its initial shape, pushing the support plate 54 to undergo a micro-displacement along the guiding groove, so that the scraping plate 52 is inserted into the notch 51 of the inner cylinder 12, forming a continuous and smooth inner wall working surface. During production, the scraping plate 52 is hidden in the notch 51 to avoid interfering with the plasticization of the raw materials. After cooling, the elastic plate 55 restores its deformation, and the scraping plate 52 separates from the inner wall, providing a movement space for the cleaning stage.

[0041] Advantage 5: The conical flow channel design reduces the retention of impurities and improves the discharge efficiency. The inner wall of the connecting pipe 2 near the plasticization area adopts a tapered structure with a gradually decreasing cross-sectional area, forming a flow channel with a gradually decreasing cross-sectional area. When the screw 3 rotates in the reverse direction, the conical surface converts the axial thrust into a combined radial and axial force, causing the impurities to converge towards the center of the discharge pipe 22, reducing the flow resistance. The smooth transition surface avoids the material deposition caused by the right-angle structure, and cooperates with the thrust of the screw 3 to quickly discharge the impurities, reducing the risk of blockage.

[0042] Advantage 6: The damping rotation inner cylinder 12 and outer cylinder 11 structure takes into account both stability and flexibility. The inner cylinder 12 is installed on the inner wall of the outer cylinder 11 in a damping manner through an annular guide rail. During normal production, the inner cylinder 12 remains relatively stationary under the action of the friction force of the raw materials, ensuring the stable conveying of the screw 3. During reverse cleaning, the outer cylinder 11 rotates against the damping torque, driving the scraping plate 52 to move, realizing the dual-mode switching of "fixed during production and rotating during cleaning", with a stable structure and flexible response.

[0043] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these 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 various embodiments of the present invention.

Claims

1. A barrel structure of a cold feed extruder with heat pipe-shaped conformal cooling, characterized in that, Including: A barrel body (1) provided inside the extruder; A connecting pipe (2) communicating with the barrel body (1) is provided inside the extruder. A screw rod (3) for conveying raw materials is provided on the barrel body (1), and the screw rod (3) extends into the connecting pipe (2). The extruder is in transmission connection with the screw rod (3) through a drive unit (4) provided inside it; Among them, the barrel body (1) includes an outer barrel (11) and an inner barrel (12). The inner barrel (12) is installed on the inner wall of the outer barrel (11) in a damped rotation manner through an annular guide rail provided on its outer surface. A cleaning member (5) for cleaning the inner wall of the inner barrel (12) is provided inside the outer barrel (11); Among them, a linkage member (6) is provided on one side of the screw rod (3) close to the drive unit (4). When the drive unit (4) drives the screw rod (3) to rotate reversely, the linkage member (6) is triggered to start, thereby driving the outer barrel (11) to rotate around the central axis of the inner barrel (12), and the cleaning member (5) cleans the inner wall of the inner barrel (12) as the outer barrel (11) rotates.

2. The barrel structure of a cold feed extruder with heat pipe-shaped conformal cooling according to claim 1, wherein: A hopper (21) connected to an external feeding device is fixedly communicated with the outer surface of the connecting pipe (2). A discharge pipe (22) is provided on the circumferential outer surface of the connecting pipe (2). The discharge pipe (22) is arranged directly below the hopper (21). An electromagnetic valve is provided on the outer surface of the discharge pipe (22). A heating element is detachably installed on the outer surface of the outer barrel (11), and a plurality of the heating elements are arranged in an array along the central axis of the outer barrel (11).

3. The barrel structure of a cold feed extruder with heat pipe conformal cooling according to claim 1, characterized in that: The linkage member (6) includes mounting plates (61) fixedly connected to the end of the connecting pipe (2), and two of the mounting plates (61) are symmetrically distributed along the center of the connecting pipe (2). A sleeve (62) fixedly connected to the outer surface of the outer barrel (11) is rotatably connected through an annular groove opened on the surface of one mounting plate (61) far from the drive unit (4). A mounting seat (63) fitting the outer surface of the screw rod (3) is rotatably connected through an annular groove opened on the surface of one mounting plate (61) close to the drive unit (4). Tooth rings (64) are respectively fixedly connected to the outer surfaces of the mounting seat (63) and the sleeve (62).

4. The barrel structure of a cold-feed extruder with heat pipe-shaped conformal cooling according to claim 1, characterized in that: The connecting pipe (2) is rotatably connected to a rotating shaft (65) through a bracket provided on its outer surface, and a gear (66) meshing with the tooth ring (64) is fixedly connected to the end of the rotating shaft (65).

5. The barrel structure of a cold feed extruder with heat pipe-shaped conformal cooling according to claim 3, characterized in that: The screw rod (3) is rotatably connected to a pawl (67) through a pin shaft provided on its outer surface, and two of the pawls (67) are centrally symmetrically distributed along the central axis of the screw rod (3). A ratchet wheel (68) fitting the pawl (67) is fixedly connected inside the mounting seat (63).

6. The barrel structure of a cold feed extruder with heat pipe-shaped conformal cooling according to claim 1, characterized in that: The cleaning member (5) includes a notch (51) opened on the inner wall of the inner barrel (12). A scraping plate (52) is provided in the notch (51), and the scraping plate (52) is designed in an arc shape. A counterweight rod (53) is detachably installed in the scraping plate (52) through a mounting hole opened inside it.

7. The barrel structure of a cold feed extruder with heat pipe type conformal cooling according to claim 1, characterized in that: The outer cylinder (11) is slidably connected with a support plate (54) through a guiding groove formed in its inner wall, and two such support plates (54) are provided and symmetrically distributed along the center of the outer cylinder (11). The support plate (54) is connected with the inner wall of the guiding groove through an elastic plate (55) arranged at its bottom, and the elastic plate (55) is made of a shape memory alloy material.

8. The barrel structure of a cold feed extruder with heat pipe-shaped conformal cooling according to claim 6, characterized in that: The scraping plate (52) is fixedly connected with a mounting shaft (56) passing through the outside of the support plate (54) through a mounting groove formed in its outer surface, and two torsion springs (57) are sleeved on the outer surface of the mounting shaft (56), and the two torsion springs (57) are symmetrically distributed along the center of the mounting shaft (56).

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