Extrusion mechanism for plastic extruder and plastic extruder

Abstract

The extrusion mechanism comprises an extrusion die head and an extrusion adjusting structure, the extrusion die head comprises a first mouth die, a second mouth die and an extrusion opening clamped between the first mouth die and the second mouth die, the first mouth die is provided with an elastic deformable lip opening part at the extrusion opening, and the second mouth die is provided with an elastic deformable lip opening part at the extrusion opening. The extrusion adjusting structure is detachably arranged on the first opening mold and connected with the lip part, and the extrusion adjusting structure is configured to force the lip part to be opened or closed, so that the opening size of the extrusion opening is adjusted. Plastic sheets with different thicknesses can be formed and extruded by the extrusion die head, and production requirements are met. And secondly, the extrusion adjusting structure is detachably mounted on the first mouth mold as a whole, so that the extrusion adjusting structure can be quickly dismounted and mounted. The plastic extruder with the extrusion mechanism can adapt to extrusion of plastic sheets with fixed thicknesses and can also adapt to extrusion of plastic sheets with different thicknesses, and the extrusion operation is more flexible and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic material forming and processing, in particular to an extrusion mechanism used for a plastic extruder and a plastic extruder with the extrusion mechanism. Background Art

[0002] In the field of plastic molding, plastic extruders can realize the crushing, softening, melting, plasticizing and extrusion of plastics. An extrusion die is usually installed on the head of the plastic extruder, and the extrusion die is usually composed of at least two dies, and a sheet extrusion port is formed between the two dies. During operation, the head of the plastic extruder outputs molten plastic material to the extrusion die, and the molten plastic material enters the extrusion die for molding, and the plastic sheet is extruded through the sheet extrusion port of the extrusion die. The sheet extrusion port of a traditional extrusion die is generally fixed. After the plastic sheet is extruded, the thickness of the sheet cannot be adjusted, and it cannot meet the production needs of plastic sheets of different thicknesses. If it is necessary to extrude sheets of different thicknesses, it is necessary to replace the extrusion die with sheet extrusion ports of different sizes. Not only does it need to configure the plastic extruder with extrusion dies of different models and sizes, resulting in equipment redundancy, but the frequent disassembly and assembly of the extrusion die also brings inconvenience in production. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide an extrusion mechanism for a plastic extruder capable of extruding plastic sheets of different thicknesses and a plastic extruder having the extrusion mechanism.

[0004] To this end, the utility model provides an extrusion mechanism for a plastic extruder, comprising:

[0005] An extrusion die head, comprising a first die, a second die and an extrusion port sandwiched between the first die and the second die, wherein the first die is provided with an elastically deformable lip portion at the extrusion port;

[0006] The extrusion adjustment structure is detachably arranged on the first die and connected to the lip portion. The extrusion adjustment structure is configured to force the lip portion to open or close, thereby adjusting the opening size of the extrusion port.

[0007] According to an embodiment of the utility model, the extrusion adjustment structure and the first die are connected by snap-fit ​​connection, bolt connection, screw connection or magnetic connection.

[0008] According to one embodiment of the utility model, the extrusion die head includes a first core die and a second core die, a first feed channel is arranged inside the first core die, the first core die is spliced ​​with the first mouth die and a first extrusion channel connected to the first feed channel is sandwiched between the two, a second feed channel is arranged inside the second core die, the second core die is spliced ​​with the second mouth die and a second extrusion channel connected to the second feed channel is sandwiched between the two, the first core die is spliced ​​with the second core die and a third feed channel and a third extrusion channel are sandwiched between the two, and the first extrusion channel, the second extrusion channel and the third extrusion channel converge at the extrusion port.

[0009] According to an embodiment of the utility model, a movable space for elastic deformation of the lip portion is provided on the first die adjacent to the lip portion.

[0010] According to one embodiment of the utility model, the extrusion adjustment structure includes a fixed seat body, a movable body movably arranged on the fixed seat body, and a traction member arranged on one end of the movable body and connected to the lip portion. The movable body can reciprocate relative to the fixed seat body so that the traction member pulls the lip portion to open or close, thereby adjusting the opening size of the extrusion port.

[0011] According to an embodiment of the utility model, a movable hole is provided through the fixed seat body, and the movable body is movably arranged in the movable hole.

[0012] According to an embodiment of the utility model, the movable body is threadedly matched with the movable hole, and one end of the movable body is rotatably connected to the traction member.

[0013] According to an embodiment of the utility model, the movable body is slidably matched with the movable hole, and one end of the movable body is rotatably connected or fixedly connected to the traction member.

[0014] According to an embodiment of the utility model, a slide groove is provided on the fixed seat body, the movable body is slidably arranged in the slide groove, and one end of the movable body is rotatably connected, hingedly connected or fixedly connected to the traction member.

[0015] According to an embodiment of the utility model, a hydraulic cavity is provided in the fixed seat body, the movable body is hydraulically fitted in the hydraulic cavity, and one end of the movable body is rotatably connected, hingedly connected or fixedly connected to the traction member.

[0016] According to an embodiment of the utility model, a pneumatic cavity is provided in the fixed seat, the movable body is pneumatically fitted in the pneumatic cavity, and one end of the movable body is rotatably connected, hingedly connected or fixedly connected to the traction member.

[0017] According to one embodiment of the utility model, a threaded frame is provided on the fixed seat body, a guide hole is penetrated in the fixed seat body, and the movable body includes a rod body inserted in the guide hole, a handle threadedly connected to one end of the rod body and threadedly connected to the threaded frame, and a traction head fixedly connected to the other end of the rod body.

[0018] According to an embodiment of the utility model, the handle has a first thread segment that is threadedly matched with the threaded rack and a second thread segment that is threadedly matched with the rod body, and the thread rotation direction of the first thread segment is opposite to that of the second thread segment.

[0019] According to an embodiment of the utility model, the traction member is snap-connected with the traction head.

[0020] According to an embodiment of the utility model, a clamping groove is provided on the lip portion, and a clamping claw engaged with the clamping groove is provided on the traction member.

[0021] According to an embodiment of the utility model, bolt holes are respectively provided on the fixed seat body and the first die, and the fixed seat body and the first die are bolted together by bolts penetrating corresponding bolt holes of the two.

[0022] According to an embodiment of the utility model, a positioning groove is provided on the first die, and a positioning portion matching with the positioning groove is provided on the fixed seat body.

[0023] According to an embodiment of the utility model, the extrusion mechanism includes a plurality of the extrusion adjustment structures, and the plurality of the extrusion adjustment structures are evenly arranged along the length direction of the first die.

[0024] The utility model also provides a plastic extruder, comprising any extrusion mechanism described in the above technical solutions.

[0025] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0026] The extrusion mechanism proposed in the utility model is provided with an extrusion adjustment structure on the first die of the extrusion die head, the extrusion adjustment structure is connected to the lip portion of the first die, and the extrusion adjustment structure can force the lip portion to open or close, thereby adjusting the opening size of the extrusion port, so as to realize the extrusion die head to extrude plastic sheets of different thicknesses to meet production needs. Secondly, the extrusion adjustment structure is detachably installed on the first die as a whole, which can realize the rapid disassembly and assembly operation of the extrusion adjustment structure, and increase the flexibility and convenience of the plastic material extrusion operation.

[0027] Correspondingly, the plastic extruder of the utility model with the above-mentioned extrusion mechanism can be adapted to the extrusion of plastic sheets of fixed thickness as well as plastic sheets of different thicknesses, and is more flexible and convenient in the production practice of plastic sheet molding and extrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional diagram of an extrusion mechanism according to a preferred embodiment of the utility model;

[0029] Figure 2 yes Figure 1 A local enlarged view of point A shown in FIG;

[0030] Figure 3 It is a plan view of an extrusion mechanism according to a preferred embodiment of the utility model;

[0031] Figure 4 It is a plan view of an extrusion adjustment structure in accordance with a preferred embodiment of the utility model;

[0032] Figure 5 yes Figure 4 An exploded view of the extrusion regulating structure shown in;

[0033] The reference numerals are as follows:

[0034] 100. Extrusion mechanism;

[0035] 1. Extrusion die head; 11. First die; 111. Lip portion; 112. Active space; 113. Positioning groove; 12. Second die; 13. Extrusion port; 14. First core die; 141. First feed channel; 142. First extrusion channel; 15. Second core die; 151. Second feed channel; 152. Second extrusion channel; 161. Third feed channel; 162. Third extrusion channel;

[0036] 2. Extrusion adjustment structure; 21. Fixed seat body; 211. Guide hole; 212. Positioning part; 22. Movable body; 221. Rod body; 222. Handle; 223. Traction head; 23. Traction member; 24. Threaded rack. DETAILED DESCRIPTION

[0037] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction on the technical solution of the utility model.

[0038] Please refer to Figure 1 , Figure 3As shown, a preferred embodiment of the utility model provides an extrusion mechanism 100 for a plastic extruder, which includes an extrusion die head 1 and an extrusion adjustment structure 2.

[0039] The extrusion die head 1 comprises a first die 11, a second die 12, a first core die 14 and a second core die 15. The first die 11 and the second die 12 are spliced ​​with each other and an extrusion port 13 is sandwiched between the two.

[0040] A first feed channel 141 is provided inside the first core mold 14, the first core mold 14 is spliced ​​with the first die 11, and a first extrusion channel 142 connected to the first feed channel 141 is sandwiched between the two. A second feed channel 151 is provided inside the second core mold 15, the second core mold 15 is spliced ​​with the second die 12, and a second extrusion channel 152 connected to the second feed channel 151 is sandwiched between the two. The first core mold 14 is spliced ​​with the second core mold 15, and a third feed channel 161 and a third extrusion channel 162 are sandwiched between the two. The first extrusion channel 142, the second extrusion channel 152 and the third extrusion channel 162 meet at the extrusion port 13.

[0041] The extrusion die head 1 exemplified in the embodiment of the utility model has three feed channels (141, 151, 161), therefore, the extrusion die head 1 can be used for co-extrusion with the heads of three plastic extruders, that is, the first feed channel 141, the second feed channel 151 and the third feed channel 161 of the extrusion die head 1 are respectively connected to the heads of the three plastic extruders to realize the co-extrusion of three materials, and finally extrude a composite sheet with three-color materials through the extrusion port 13.

[0042] Specifically, when the extrusion die head 1 cooperates with the heads of three plastic extruders for co-extrusion operation, the heads of the three plastic extruders respectively provide molten materials, and the three molten materials respectively enter the first feed channel 141, the second feed channel 151 and the third feed channel 161, and then the three materials respectively pass through the corresponding first extrusion channel 142, the second extrusion channel 152 and the third extrusion channel 162 and then converge at the extrusion port 13, and finally extrude the plastic composite sheet through the extrusion port 13.

[0043] Among them, the three strands of material can be the same material or different materials, such as materials A, B, and C, or a combination or compound of at least two materials A, B, and C, so that the extruded plastic sheet can be a plastic composite sheet with multiple composite layers such as ABC, ABA, ACA, BCB, etc., without specific limitation.

[0044] It should be noted that the extrusion mechanism 100 exemplified in the embodiment of the present utility model is not limited to an extrusion die head for extruding multiple materials, but can also be an extrusion die head for extruding single-color materials or an extrusion die head for co-extruding materials of two or more colors. And the extrusion mechanism 100 exemplified in the above embodiment can be used for many different types of plastic extruders, such as a single-screw plastic extruder, a twin-screw plastic extruder, a plastic extruder for feeding single-color plastic or a plastic extruder for co-extruding multiple colors, and is not limited to a specific type of plastic extruder, and is not specifically limited.

[0045] Combination Figure 2 , Figure 3 As shown, the first die 11 is provided with an elastically deformable lip portion 111 at the extrusion port 13. A movable space 112 is provided on the first die 11 adjacent to the lip portion 111 for the lip portion 111 to generate elastic deformation.

[0046] The extrusion adjustment structure 2 is detachably disposed on the first die 11 and connected to the lip portion 111 . The extrusion adjustment structure 2 is configured to force the lip portion 111 to open or close, thereby adjusting the opening size of the extrusion port 13 .

[0047] Since the size of the extrusion die 1 is relatively large, in order to facilitate more uniform adjustment of the opening size of the extrusion port 13 of the extrusion die 1, the extrusion mechanism 100 can be provided with multiple extrusion adjustment structures 2, and the multiple extrusion adjustment structures 2 are evenly arranged along the length direction of the first die 11, without specific limitation.

[0048] Combination Figure 4 , Figure 5 As shown, the extrusion adjustment structure 2 includes a fixed seat body 21, a movable body 22 movably arranged on the fixed seat body 21, and a traction member 23 arranged on one end of the movable body 22 and connected to the lip portion 111. The movable body 22 can reciprocate relative to the fixed seat body 21 so that the traction member 23 pulls the lip portion 111 to open or close, thereby adjusting the opening size of the extrusion port 13.

[0049] Bolt holes are respectively provided on the fixed seat body 21 and the first die 11 , and the fixed seat body 21 and the first die 11 are bolted together by bolts passing through the corresponding bolt holes of the two.

[0050] In order to facilitate the installation of the extrusion adjustment structure 2 on the first die 11, a positioning groove 113 is provided on the first die 11, and a positioning portion 212 matching the positioning groove 113 is provided on the fixed seat body 21. Before the fixed seat body 21 is fixed to the first die 11 by bolts, the positioning portion 212 on the fixed seat body 21 can be engaged with the positioning groove 113 on the first die 11 to achieve pre-positioning of the fixed seat body 21 and the first die 11, which is convenient for the subsequent bolt connection operation of the fixed seat body 21 and the first die 11.

[0051] In some embodiments, in order to facilitate the extrusion adjustment structure 2 to be easily disassembled from the first die 11 as a whole, the extrusion adjustment structure 2 and the first die 11 can be connected by snaps, screws or magnetically, without specific limitation.

[0052] The fixed seat body 21 is provided with a threaded frame 24, and a guide hole 211 is penetrated in the fixed seat body 21. The movable body 22 includes a rod body 221 penetrated in the guide hole 211, a handle 222 provided on one end of the rod body 221 and threadedly connected to the threaded frame 24, and a traction head 223 fixedly connected to the other end of the rod body 221. The traction member 23 is engaged with the traction head 223. A slot is provided on the lip portion 111, and a claw engaged with the slot is provided on the traction member 23.

[0053] The handle 222 has a first thread segment threadedly matched with the threaded frame 24 and a second thread segment threadedly matched with the rod body 221 , and the thread rotation direction of the first thread segment is opposite to that of the second thread segment.

[0054] During operation, the handle 222 can be twisted or twisted by a manual tool such as a wrench, thereby driving the rod body 221 to move axially, and the traction head 223 drives the traction member 23 to move axially, thereby pulling the lip portion 111 to open or close, thereby adjusting the opening size of the extrusion port 13.

[0055] Specifically, since the thread direction of the first thread segment (located at the upper section of the shank 222) and the second thread segment (located at the lower section of the shank 222) are opposite, for example, if the thread of the first thread segment is a left-handed thread, the thread of the second thread segment is a right-handed thread; if the first thread segment is a right-handed thread, the thread of the second thread segment is a left-handed thread, without specific limitation.

[0056] When the user twists or turns the handle 222 in the counterclockwise direction with the help of a hand tool such as a wrench, the handle 222 can be displaced axially upward relative to the fixed seat body 21, and the handle 222 is twisted out or screwed out relative to the fixed seat body 21, while the second threaded section of the handle 222 is screwed into the inside of the rod body 221, further driving the rod body 222 to shrink into the fixed seat body 21, thereby pulling the lip portion 111 to open, and the extrusion port 13 is adjusted larger. On the contrary, when the user twists or turns the handle 222 in the clockwise direction with the help of a hand tool such as a wrench, the handle 222 can be displaced axially downward relative to the fixed seat body 21, and the handle 222 is twisted in or screwed out relative to the fixed seat body 21, while the second threaded section of the handle 222 is screwed out from the inside of the rod body 221, further driving the rod body 222 to extend out of the fixed seat body 21, thereby pulling the lip portion 111 to close, and the extrusion port 13 is adjusted smaller.

[0057] In some embodiments, the connection between the traction member 23 and the traction head 223 of the movable body 22 is not limited to the clamping connection, but may be fixed connection, hinged connection or rotational connection, without specific limitation. The connection between the lip portion 111 and the traction member 23 is not limited to the clamping connection, but may be fixed connection, hinged connection or rotational connection, without specific limitation.

[0058] In some embodiments, the movable body 22 is not limited to the method of screwing the handle 222 and the threaded frame 24 to achieve axial displacement, thereby pulling the lip portion 111 to open or close, and achieving the purpose of adjusting the opening size of the extrusion port 13. Alternatively, a movable hole is provided through the fixed seat body 21, and the movable body 22 is movably inserted into the movable hole. The movable body 22 is threadedly matched with the movable hole, and one end of the movable body 22 is rotatably connected to the traction member 23.

[0059] In some embodiments, the extrusion adjustment structure 2 is not limited to realizing axial displacement based on a threaded connection, so that the traction member 23 pulls the lip portion 111 to open or close, and realizes the purpose of adjusting the opening size of the extrusion port 13. The movable body 22 may be slidably matched with the movable hole, and one end of the movable body 22 may be rotatably connected or fixedly connected with the traction member 23. It is similar to the "pulling" structure or "lifting" structure of the pull rod, and is not specifically limited.

[0060] In some embodiments, the extrusion adjustment structure 2 is not limited to realizing axial displacement based on a threaded connection, so that the traction member 23 pulls the lip portion 111 to open or close, and realizes the purpose of adjusting the opening size of the extrusion port 13. A slide groove may be provided on the fixed seat body 21, and the movable body 22 is slidably provided in the slide groove. One end of the movable body 22 is rotatably connected, hinged or fixedly connected to the traction member 23. The movable body 22 may be driven by a transmission structure such as a screw motor, a cylinder or an oil cylinder, or may be manually pushed and pulled, and there is no specific limitation.

[0061] In some embodiments, the extrusion adjustment structure 2 is not limited to realizing axial displacement based on threaded connection, so as to realize that the traction member 23 pulls the lip portion 111 to open or close, and realizes the purpose of adjusting the opening size of the extrusion port 13. Alternatively, a hydraulic cavity is provided in the fixed seat body 21, and the movable body 22 is hydraulically matched in the hydraulic cavity, and one end of the movable body 22 is rotatably connected, hinged or fixedly connected to the traction member 23. The structure is similar to the hydraulic rod of the hydraulic cylinder, and is not specifically limited.

[0062] In some embodiments, the extrusion adjustment structure 2 is not limited to the use of threaded connection to achieve axial displacement, so that the traction member 23 pulls the lip portion 111 to open or close, and achieves the purpose of adjusting the opening size of the extrusion port 13. It is also possible that a pneumatic cavity is provided in the fixed seat body 21, and the movable body 22 is pneumatically fitted in the pneumatic cavity, and one end of the movable body 22 is rotatably connected, hinged or fixedly connected to the traction member 23. The structure is similar to the pneumatic rod of the cylinder, and is not specifically limited.

[0063] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. An extrusion mechanism for a plastic extruder, characterized in that: include: An extrusion die head (1) comprises a first die (11), a second die (12), and an extrusion port (13) sandwiched between the first die (11) and the second die (12), wherein the first die (11) is provided with an elastically deformable lip portion (111) at the extrusion port (13); An extrusion adjustment structure (2) is detachably arranged on the first die (11) and connected to the lip portion (111), wherein the extrusion adjustment structure (2) is configured to force the lip portion (111) to open or close, thereby adjusting the opening size of the extrusion port (13).

2. The extrusion mechanism for a plastic extruder according to claim 1, characterized in that: The extrusion adjustment structure (2) and the first die (11) are connected by snap-fit, bolt, screw or magnetic attraction.

3. The extrusion mechanism for a plastic extruder according to claim 1, characterized in that: A movable space (112) is provided on the first die (11) adjacent to the lip portion (111) and capable of allowing the lip portion (111) to undergo elastic deformation.

4. The extrusion mechanism for a plastic extruder according to any one of claims 1 to 3, characterized in that: The extrusion adjustment structure (2) comprises a fixed seat body (21), a movable body (22) movably arranged on the fixed seat body (21), and a traction member (23) arranged on one end of the movable body (22) and connected to the lip portion (111); the movable body (22) can reciprocate relative to the fixed seat body (21) so that the traction member (23) can pull the lip portion (111) to open or close, thereby adjusting the opening size of the extrusion port (13).

5. The extrusion mechanism for a plastic extruder according to claim 4, characterized in that: The fixed seat body (21) is provided with a threaded frame (24), the fixed seat body (21) is provided with a guide hole (211) penetrating therein, the movable body (22) comprising a rod body (221) penetrating the guide hole (211), a handle (222) threadedly connected to one end of the rod body (221) and threadedly connected to the threaded frame (24), and a traction head (223) fixedly connected to the other end of the rod body (221).

6. The extrusion mechanism for a plastic extruder according to claim 5, characterized in that: The handle (222) comprises a first thread segment threadably matched with the threaded frame (24) and a second thread segment threadably matched with the rod body (221); the thread rotation direction of the first thread segment is opposite to the thread rotation direction of the second thread segment.

7. The extrusion mechanism for a plastic extruder according to claim 4, characterized in that: The lip portion (111) is provided with a slot, and the traction member (23) is provided with a claw engaged with the slot.

8. The extrusion mechanism for a plastic extruder according to claim 4, characterized in that: The first die (11) is provided with a positioning groove (113), and the fixed seat body (21) is provided with a positioning portion (212) that matches the positioning groove (113).

9. The extrusion mechanism for a plastic extruder according to claim 1, characterized in that: The extrusion mechanism comprises a plurality of the extrusion adjustment structures (2), and the plurality of the extrusion adjustment structures (2) are evenly arranged along the length direction of the first die (11).

10. A plastic extruder, characterized in that: The invention comprises the extrusion mechanism described in any one of claims 1 to 9.

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