Four-screw extruder

Abstract

The utility model relates to the field of extruders, in particular to a four-screw extruder, which comprises a frame and an extrusion box arranged on the frame, a workbench is arranged on the frame, the extrusion box is mounted on the workbench, a screw mechanism for extruding materials is arranged in the extrusion box, and the screw mechanism is mounted on the frame. The screw rod mechanism comprises a first driving screw rod, a second driving screw rod, a first rotating screw rod and a second rotating screw rod, and the two ends of the first driving screw rod and the two ends of the second driving screw rod are provided with forward spiral blades and reverse spiral blades correspondingly. A first spiral blade and a second spiral blade are arranged on the outer surface of the first rotating screw rod and the outer surface of the second rotating screw rod, and the first spiral blade and the second spiral blade spirally extend in the axial direction. The phenomena of continuous accumulation and blockage of the raw materials at the discharge hole are reduced, the extrusion stability and reliability are improved, and the mixing effect and the extrusion efficiency of the raw materials are further enhanced.

Description

Technical Field

[0001] The utility model relates to the field of extruders, in particular to a four-screw extruder. Background Art

[0002] An extruder is a very important device in the field of machinery. It uses heat, pressure, and mechanical force to extrude fluid raw materials into shapes and has a wide range of applications, including but not limited to the production and processing of plastic products. Specifically, an extruder can process various types of plastic raw materials and, through different dies and molding processes, can produce plastic products of various shapes and specifications, such as pipes, sheets, films, profiles, and screws. These plastic products are widely used in industries such as construction, packaging, medical care, and automobiles, meeting the demand for plastic products in various fields. In actual applications, the extruder can achieve continuous production, high production efficiency, and low production costs. It has a high degree of automation and can achieve large-scale, high-speed, and high-precision production and manufacturing, meeting the factory's demand for efficient production.

[0003] Existing extruders typically consist of a feed system, a screw system, a heating and cooling system, a die system, and a control system. The feed system is used to feed raw materials from the silo into the screw system in the extruder. The screw system, consisting of a screw and a barrel, transports the raw materials from the feed system to the die system, where they are heated, melted, and extruded. The die system is the key component that extrudes the raw materials from the screw system and forms the desired product shape. The control system is also equipped to control and regulate the operation of the extruder.

[0004] However, although the existing extruder plays an important role in the production and processing of plastic products, it still has some defects. First, the screw mechanism of the existing four-screw extruder is relatively simple. The raw material is extruded along the spiral blades extending in the same axial direction of the screw and transported to the discharge port. Due to the temperature change of the material during the extrusion process of the screw, the raw material is easily accumulated at the discharge port, resulting in blockage of the discharge port, affecting production efficiency or causing damage to the extruder. Secondly, the structure and shape of the discharge die assembly of the existing four-screw extruder have certain limitations on the extrusion of the extruded product, resulting in uneven flow of the raw material during the extrusion process, resulting in insufficient extrusion force, thereby making the extrusion efficiency low, affecting the production efficiency and quality of the extruder. Utility Model Content

[0005] The purpose of the utility model is to solve the above defects and provide a four-screw extruder to solve the phenomenon that raw materials are easily accumulated at the discharge port of the extruder and cause blockage in the above-mentioned background technology, and the technical problem that the extrusion flow of the existing extruder is uneven, resulting in insufficient extrusion force, thereby affecting the extrusion efficiency and extrusion quality.

[0006] The purpose of this utility model is achieved by the following methods:

[0007] A four-screw extruder comprises a frame and an extrusion box arranged on the frame, the extrusion box is provided with a hopper for introducing materials, and one end of the extrusion box is provided with a discharge port, the discharge port is connected to a discharge assembly, a workbench is provided on the frame, the extrusion box is mounted on the workbench, a screw mechanism for extruding materials is provided inside the extrusion box, the screw mechanism comprises a first driving screw, a second driving screw, a first rotating screw and a second rotating screw, one end of the extrusion box is provided with a mounting plate for connecting the screw mechanism, the mounting plate is provided with a plurality of bearing seats for matching and mounting the first driving screw, the second driving screw, the first rotating screw and the second rotating screw, the first One end of the driving screw and the second driving screw extends toward the discharging assembly, and both ends of the first driving screw and the second driving screw are respectively provided with a forward spiral blade and a reverse spiral blade, one end of the first rotating screw and the second rotating screw extends toward the discharging assembly through the discharging port, and the outer surfaces of the first rotating screw and the second rotating screw are provided with a first spiral blade and a second spiral blade extending spirally along the axial direction, and a driving mechanism for driving the first driving screw and the second driving screw to rotate is provided on the workbench, and the first driving screw, the second driving screw, the first rotating screw and the second rotating screw are all connected with mutually meshing and matching synchronous gears at one end close to the driving mechanism.

[0008] Further in the above description, one end of the first driving screw, the second driving screw, the first rotating screw and the second rotating screw are respectively coaxially connected to a bearing seat of the mounting plate, and the end of the first driving screw, the second driving screw, the first rotating screw and the second rotating screw close to the driving mechanism are all connected to a synchronous gear, so that two adjacent synchronous gears are meshed and connected.

[0009] Further in the above description, one end of the first drive screw and the second drive screw pass through the mounting plate to be connected to the drive mechanism, and two groups of drive mechanisms are provided, and both groups of drive mechanisms include a drive motor and a reducer, the output end of the drive motor is connected to the input end of the reducer, and the output end of the reducer is coaxially connected to the first drive screw or the second drive screw.

[0010] Further in the above description, the discharge assembly includes a pressurized feed cylinder and a discharge pipe, one end of the pressurized feed cylinder is connected to one side of the extrusion box, so that the pressurized feed cylinder is paired and connected with the discharge port through the feed channel, and the other end of the pressurized feed cylinder is connected to one end of the discharge pipe, and the discharge end of the discharge pipe extends outward.

[0011] Further in the above description, there are two discharge ports, and a feed channel is formed inside the pressurized feed cylinder that is matched with the position of the discharge port and the feed, so that the two discharge ports are matched and connected with the two feed channels, and the end of the discharge cylinder close to the pressurized feed cylinder is trumpet-shaped and gradually decreases from large to small, and the end of the discharge cylinder away from the pressurized feed cylinder forms a discharge end that extends outward and expands.

[0012] Further in the above description, a detachable extrusion base is provided at the bottom of the extrusion box, and a jacking mechanism for driving the extrusion base to rise and fall is provided in the frame, and two groups of jacking mechanisms are provided, and both groups of jacking mechanisms include two horizontally arranged sliding seats, two cross-arranged jacking links and a mounting top plate for connecting the extrusion base, a bottom plate for installing the jacking mechanism is provided in the frame, the sliding seat is installed on the bottom plate through a sliding member, one end of the jacking link is hinged to a sliding seat, and the other end of the jacking link is hinged to the mounting top plate, and a driving assembly for driving the two sliding seats to approach or move away from each other is provided on the bottom plate, so that the two jacking links can lift or lower the extrusion base through the mounting top plate under the sliding of the two sliding seats.

[0013] The above description further states that the drive assembly includes a rotating motor, a commutator, two steering gears and two screw rods. The rotating motor is mounted on a base plate. One end of the rotating motor is connected to the commutator. The output end of the commutator is connected to one end of the steering gear through a coupling. One end of the screw rod is coaxially connected to the steering gear, and the other end of the screw rod is matched with two sliding seats through two nuts, so that the sliding seat can move along the axial direction of the screw rod through the nut.

[0014] Further in the above description, the hopper is provided with an openable and closable box cover, one side of the hopper is connected to the box cover through a driving cylinder, and the box cover is provided with a bracket connected to the telescopic end of the driving cylinder.

[0015] Further in the above description, a cabinet door that can be opened and closed is provided on the side of the rack.

[0016] The beneficial effects of the utility model are as follows: the first driving screw, the second driving screw, the first rotating screw and the second rotating screw are connected and matched by synchronous gears, so that the screws are linked by the meshing of the synchronous gears, and the first driving screw and the second driving screw are driven to rotate by the driving mechanism, so that the four screws can achieve full and uniform mixing and efficient extrusion of the materials, and the first rotating screw and the second rotating screw extend through the discharge port to the discharge component, and a spiral blade extending spirally along the axial direction is provided to further enhance the extrusion effect of the material through the discharge port, and the material is guided by the spiral blade. The extrusion process is more uniform and stable, thereby improving the uniformity of the extrusion flow and the extrusion force, and improving the extrusion efficiency. The forward spiral blades and reverse spiral blades at both ends of the first drive screw and the second drive screw are arranged so that the raw materials are guided to the discharge port by the forward spiral blades. When the raw materials accumulate and become blocked in the discharge port, the raw materials are reversely extruded from the accumulated discharge port under the reverse extrusion of the reverse spiral blades, thereby reducing the continuous accumulation and blockage of the raw materials in the discharge port, improving the stability and reliability of the extrusion, and further enhancing the mixing effect and extrusion efficiency of the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram from a front perspective of this embodiment;

[0018] Figure 2 This is a three-dimensional diagram from a rear-view angle of this embodiment;

[0019] Figure 3 Schematic diagram of the internal structure of the extrusion box in this embodiment;

[0020] Figure 4 Schematic diagram of the structure of the screw mechanism in this embodiment;

[0021] Figure 5 is a cross-sectional view of this embodiment;

[0022] Figure 6 Schematic diagram of the structure of the jacking mechanism in this embodiment;

[0023] Figure 7 Schematic diagram of the structure of the discharge assembly in this embodiment;

[0024] The reference numerals in the figure are: 1-frame, 2-extrusion box, 3-hopper, 4-discharge port, 5-discharge assembly, 51-pressurized feed cylinder, 52-discharge pipe, 53-feeding channel, 6-workbench, 7-screw mechanism, 71-first driving screw, 72-second driving screw, 73-first rotating screw, 74-second rotating screw, 75-forward spiral blade, 76-reverse spiral blade, 77-first spiral blade, 78-second spiral blade, 8-mounting plate, 9-bearing seat, 10-driving mechanism, 101-driving motor, 102-reducer, 11-synchronous gear, 12-extrusion base, 13-lifting mechanism, 131-sliding seat, 132-lifting connecting rod, 133-mounting top plate, 134-bottom plate, 135-sliding part, 14-driving assembly, 141-rotating motor, 142-commutator, 143-steering gear, 144-screw, 15-box cover, 16-driving cylinder. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementations.

[0026] In this embodiment, refer to Figure 1-Figure 7 , a four-screw extruder is specifically implemented, comprising a frame 1 and an extrusion box 2 arranged on the frame 1, the extrusion box 2 is provided with a hopper 3 for introducing materials, and one end of the extrusion box 2 is provided with a discharge port 4, and the discharge port 4 is connected to a discharge assembly 5, a workbench 6 is provided on the frame 1, the extrusion box 2 is mounted on the workbench 6, and a screw mechanism 7 for extruding materials is provided inside the extrusion box 2, the screw mechanism 7 includes a first driving screw 71, a second driving screw 72, a first rotating screw 73 and a second rotating screw 74, and a mounting plate 8 for connecting the screw mechanism 7 is provided at one end of the extrusion box 2, and four bearing seats 9 for pairing and mounting the first driving screw 71, the second driving screw 72, the first rotating screw 73 and the second rotating screw 74 are provided on the mounting plate 8. One end of the movable screw 71 and the second driving screw 72 extends toward the discharge assembly 5, and the two ends of the first driving screw 71 and the second driving screw 72 are respectively provided with a forward spiral blade 75 and a reverse spiral blade 76, one end of the first rotating screw 73 and the second rotating screw 74 extends toward the discharge assembly 5 through the discharge port 4, and the outer surfaces of the first rotating screw 73 and the second rotating screw 74 are provided with a first spiral blade 77 and a second spiral blade 78 extending spirally along the axial direction, and a driving mechanism 10 for driving the first driving screw 71 and the second driving screw 72 to rotate is provided on the workbench 6, and the first driving screw 71, the second driving screw 72, the first rotating screw 73 and the second rotating screw 74 are connected to the end of the driving mechanism 10 that is close to the driving mechanism 10 with mutually meshing matching synchronous gears 11.

[0027] One end of the first driving screw 71, the second driving screw 72, the first rotating screw 73 and the second rotating screw 74 are respectively coaxially connected to a bearing seat 9 of the mounting plate 8, and the end of the first driving screw 71, the second driving screw 72, the first rotating screw 73 and the second rotating screw 74 close to the driving mechanism 10 are all connected to a synchronous gear 11, so that two adjacent synchronous gears 11 are meshed and connected.

[0028] Specifically, each screw is connected to at least one bearing seat 9, and each screw is connected to a synchronous gear 11. Two adjacent synchronous gears 11 are meshed and connected, thereby driving the four screws to rotate synchronously. The paired synchronous gears 11 ensure synchronized operation between the screws, avoiding problems such as uneven material mixing or poor extrusion performance caused by inconsistent rotational speeds.

[0029] One end of the first drive screw 71 and the second drive screw 72 passes through the mounting plate 8 and is connected to the drive mechanism 10. The drive mechanism 10 is provided with two groups, and both groups of drive mechanisms 10 include a drive motor 101 and a reducer 102. The output end of the drive motor 101 is connected to the input end of the reducer 102, and the output end of the reducer 102 is coaxially connected to the first drive screw 71 or the second drive screw 72.

[0030] Specifically, one end of the first drive screw 71 and the second drive screw 72 are mated and connected to the output shaft of a reducer 102. Drive motor 101 drives the corresponding first drive screw 71 and second drive screw 72 to rotate. This, in turn, meshes with synchronizing gear 11, driving first rotating screw 73 and second rotating screw 74 to rotate synchronously. Drive mechanism 10 provides a stable and reliable power source for screw mechanism 7, ensuring precise screw rotation and smooth extrusion of material.

[0031] The discharge assembly 5 includes a pressurized feed barrel 51 and a discharge pipe 52. One end of the pressurized feed barrel 51 is connected to one side of the extrusion box 2, so that the pressurized feed barrel 51 is connected to the discharge port 4 through a feed channel 53. The other end of the pressurized feed barrel 51 is connected to one end of the discharge pipe 52, and the discharge end of the discharge pipe 52 extends outward. There are two discharge ports 4. The interior of the pressurized feed barrel 51 is formed with a feed channel 53 that matches the position and feed of the discharge port 4, so that the two discharge ports 4 are connected to the two feed channels 53. The end of the discharge barrel near the pressurized feed barrel 51 is trumpet-shaped, gradually decreasing in size as it moves away from the pressurized feed barrel 51, and the end of the discharge barrel away from the pressurized feed barrel 51 forms a discharge end that extends outward.

[0032] The pressurized feed cylinder 51 is provided to allow the extruded raw materials to flow more smoothly along the discharge path, thereby improving the efficiency and stability of material transportation. The discharge pipe 52 exerts a certain pressure on the raw materials through its gradually decreasing trumpet-shaped cross-section, and conveniently extrudes the raw materials from the outward-expanding discharge end, thereby reducing the accumulation and blockage of the raw materials in the discharge component 5 and improving the stability of extrusion.

[0033] A detachable extrusion base 12 is provided at the bottom of the extrusion box 2, and a jacking mechanism 13 for driving the extrusion base 12 to rise and fall is provided in the frame 1. The jacking mechanism 13 is provided with two groups, and both groups of jacking mechanisms 13 include two horizontally arranged sliding seats 131, two cross-arranged jacking links 132 and a mounting top plate 133 for connecting the extrusion base 12. A bottom plate 134 for mounting the jacking mechanism 13 is provided in the frame 1, and the sliding seat 131 is mounted on the bottom plate 134 through a sliding member 135. One end of the jacking link 132 is hinged to one sliding seat 131, and the other end of the jacking link 132 is hinged to the mounting top plate 133. A driving assembly 14 is provided on the bottom plate 134 for driving the two sliding seats 131 to approach or move away from each other, so that the two jacking links 132 lift or lower the extrusion base 12 through the mounting top plate 133 under the sliding of the two sliding seats 131.

[0034] Specifically, the sliding setting of the lifting connecting rod 132 can drive the extrusion base 12 to rise or fall, thereby facilitating the lifting and separation of the extrusion base 12 from the extrusion box 2, thereby facilitating the cleaning of the inside of the extrusion box 2 or the inspection and maintenance of the screw mechanism 7, thereby improving practicality.

[0035] Optionally, a support seat is provided on the bottom plate 134 , a support guide rod is coaxially connected to the interior of the support seat, and a top end of the support guide rod is connected to a bearing frame for supporting the extrusion base 12 .

[0036] The driving assembly 14 includes a rotating motor 141, a commutator 142, two steering gears 143 and two screw rods 144. The rotating motor 141 is installed on the base plate 134. One end of the rotating motor 141 is connected to the commutator 142. The output end of the commutator 142 is connected to one end of the steering gear 143 through a coupling. One end of the screw rod 144 is coaxially connected to the steering gear 143, and the other end of the screw rod 144 is matched with the two sliding seats 131 through two nuts, so that the sliding seat 131 can move along the axial direction of the screw rod 144 through the nut.

[0037] Specifically, the screw rod 144 in this embodiment is made of a positive and negative thread screw rod 144, so that the two sliding seats 131 are connected through the positive and negative thread screw rod 144, so that the two sliding seats 131 can be driven to move closer to or away from each other along the axial direction of the screw rod 144, thereby driving the cross-set lifting connecting rod 132 to raise or lower the mounting top plate 133, thereby lifting or lowering the extrusion base 12 for separation.

[0038] The hopper 3 is provided with an openable and closable box cover 15, one side of the hopper 3 is connected to the box cover 15 through a driving cylinder 16, and the box cover 15 is provided with a bracket connected to the telescopic end of the driving cylinder 16. The side of the frame is provided with an openable and closable cabinet door.

[0039] Specifically, the spiral directions of the first spiral blade 77 and the second spiral blade 78 are set in opposite directions, so as to further improve the mixing and stirring of the raw materials and improve the subsequent extrusion quality, and the forward spiral blade 75 is set at one end of the first drive screw 71 and the second drive screw 72 close to the drive mechanism 10, and the reverse spiral blade 76 is set at one end of the first drive screw 71 and the second drive screw 72 close to the discharge port 4, so that under the reverse extrusion of the reverse spiral blade 76, the raw materials accumulated at the discharge port 4 can be reversely extruded, thereby reducing the blockage caused by the accumulation of raw materials at the discharge port 4.

[0040] The specific usage principle of this embodiment is as follows: the positive and negative teeth of the lead screw 144 are driven to rotate by the transmission motor, so that the two nuts are respectively installed on the positive and negative teeth of the lead screw 144, and the nut is connected to the sliding seat 131, which can drive it to move closer to or away from each other along the axial direction of the lead screw 144. When the sliding seats 131 are close to each other, the lifting connecting rod 132 drives the extrusion base 12 to rise, so that it is connected to the extrusion box 2. One end of the first driving screw 71, the second driving screw 72, the first rotating screw 73 and the second rotating screw 74 are respectively connected to a synchronous gear 11, and the meshing of the two adjacent synchronous gears 11 forms a linkage, so that the first driving screw 71 and the second driving screw 72 are driven to rotate by a corresponding driving motor 101, so that the four screws can achieve sufficient and uniform mixing of materials and efficient extrusion;

[0041] The first rotating screw 73 and the second rotating screw 74 extend through the discharge port 4 to the discharge assembly 5, and are provided with spiral blades that extend spirally in the axial direction, thereby further enhancing the extrusion effect of the material through the discharge port 4. The spiral blades guide the material to be more uniform and stable during the extrusion process, thereby improving the uniformity of the extrusion flow and the extrusion force, thereby improving the extrusion efficiency.

[0042] The forward spiral blades 75 and reverse spiral blades 76 at both ends of the first drive screw 71 and the second drive screw 72 are set so that the raw material is transported to the discharge port 4 under the guidance of the forward spiral blades 75. When the accumulation and blockage of raw materials are formed in the discharge port 4, the raw material is reversely extruded from the accumulated discharge port 4 under the reverse extrusion and stirring of the reverse spiral blades 76, thereby reducing the continuous accumulation and blockage of raw materials in the discharge port 4. The pressurized feed cylinder 51 connected by the two discharge ports 4 allows the raw material to enter the pressurized feed cylinder 51 along the discharge port 4 after extrusion. Specifically, two feed channels 53 are provided in the pressurized feed cylinder 51, so that the two feed channels 53 are paired with the two discharge ports 4. Through the connected discharge pipe 52, a double-input and single-output conveying path is formed, thereby increasing the extrusion pressure. The trumpet-shaped discharge pipe 52 further improves the stability and reliability of extrusion, reduces the accumulation and blockage of raw materials in the discharge pipe 52, and enhances the mixing effect and extrusion efficiency of the raw materials.

[0043] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention is disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the above-disclosed technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention, which do not depart from the content of the technical solution of the present invention, are within the scope of the technical solution of the present invention.

Claims

1. A four-screw extruder, comprising a frame and an extrusion box mounted on the frame, the extrusion box being provided with a hopper for introducing material, and a discharge port being provided at one end of the extrusion box, the discharge port being connected to a discharge assembly, characterized in that: The cam is provided with a first gear and a second gear, and the cam is provided with a first gear and a second gear, and the cam is provided with a first gear and a second gear, and the cam is provided with a second gear, and the cam is provided with a first gear and a second gear.

2. A four-screw extruder according to claim 1, characterized in that: One end of the first driving screw, the second driving screw, the first rotating screw and the second rotating screw are respectively coaxially connected to a bearing seat of the mounting plate, and one end of the first driving screw, the second driving screw, the first rotating screw and the second rotating screw close to the driving mechanism are all connected to a synchronous gear, so that two adjacent synchronous gears are meshed and connected.

3. A four-screw extruder according to claim 2, characterized in that: One end of the first drive screw and the second drive screw passes through the mounting plate and is connected to the drive mechanism. Two groups of drive mechanisms are provided, and both groups of drive mechanisms include a drive motor and a reducer. The output end of the drive motor is connected to the input end of the reducer, and the output end of the reducer is coaxially connected to the first drive screw or the second drive screw.

4. A four-screw extruder according to claim 1, characterized in that: The discharge assembly includes a pressurized feed cylinder and a discharge pipe. One end of the pressurized feed cylinder is connected to one side of the extrusion box, so that the pressurized feed cylinder is paired and connected with the discharge port through the feed channel, and the other end of the pressurized feed cylinder is connected to one end of the discharge pipe, and the discharge end of the discharge pipe extends outward.

5. A four-screw extruder according to claim 4, characterized in that: There are two discharge ports, and a feed channel is formed inside the pressurized feed cylinder to match the position of the discharge port and the feed, so that the two discharge ports are matched with the two feed channels. The end of the discharge cylinder close to the pressurized feed cylinder is trumpet-shaped and gradually decreases from large to small, and the end of the discharge cylinder away from the pressurized feed cylinder forms a discharge end that extends outward and expands.

6. A four-screw extruder according to claim 1, characterized in that: The bottom of the extrusion box is provided with a detachable extrusion base, and a jacking mechanism for driving the extrusion base to rise and fall is provided in the frame, and two groups of jacking mechanisms are provided, and both groups of jacking mechanisms include two horizontally arranged sliding seats, two cross-arranged jacking links and a mounting top plate for connecting the extrusion base. A base plate for installing the jacking mechanism is provided in the frame, and the sliding seat is mounted on the base plate through a sliding member, one end of the jacking link is hinged to a sliding seat, and the other end of the jacking link is hinged to the mounting top plate, and a driving assembly for driving the two sliding seats to approach or move away from each other is provided on the base plate, so that the two jacking links can lift or lower the extrusion base through the mounting top plate under the sliding of the two sliding seats.

7. A four-screw extruder according to claim 6, characterized in that: The driving assembly includes a rotating motor, a commutator, two steering gears and two screw rods. The rotating motor is installed on the base plate. One end of the rotating motor is connected to the commutator. The output end of the commutator is connected to one end of the steering gear through a coupling. One end of the screw rod is coaxially connected to the steering gear, and the other end of the screw rod is matched with two sliding seats through two nuts, so that the sliding seat can move along the axial direction of the screw rod through the nut.

8. A four-screw extruder according to any one of claims 1 to 7, characterized in that: The hopper is provided with an openable and closable box cover, one side of the hopper is connected to the box cover through a driving cylinder, and the box cover is provided with a bracket connected to the telescopic end of the driving cylinder.

9. A four-screw extruder according to any one of claims 1 to 7, characterized in that: The side of the frame is provided with an openable and closable cabinet door.

Images