Double-screw extrusion mechanism convenient for sampling detection

Abstract

The invention discloses a double-screw extrusion mechanism convenient for sampling detection, and belongs to the technical field of sampling, the double-screw extrusion mechanism comprises a conveying motor and two sampling outer frames, the conveying motor is connected with two screw extrusion shafts through a gear set mechanism, and sampling holes are formed in the left inner side wall, the right inner side wall and the lower inner side wall of each sampling outer frame. Through the arrangement of the mounting cavity seat and the sampling assembly, materials conveyed at different positions in the same conveying stage can be sampled and compared through negative pressure sampling on the two sides and in the middle, and comparison sampling of the materials conveyed at the same position in the different conveying stages is achieved through respective sampling of the front sampling outer frame and the rear sampling outer frame; and meanwhile, through the arrangement of an electric push rod and a double-cambered-surface compensation pressing plate, reciprocating downward pressing of the double-cambered-surface compensation pressing plate can be used in cooperation with continuous pressing-in of high-pressure materials at the input end of the whole double-screw extrusion mechanism, and a cavity formed by sampling is compensated.

Description

Technical Field

[0001] The invention relates to the technical field of sampling, in particular to a double-screw extrusion mechanism which is convenient for sampling and testing. Background Art

[0002] The twin-screw extruder mechanism is mostly used in screw extruders for injection molding. When the screw extruder uses the twin-screw extruder mechanism, it involves stages such as material compression, plasticizing and shearing, melt conveying, and exhaust and pressure reduction.

[0003] In order to ensure the molding quality of injection molded products, the conveying material is usually sampled when it is produced through a screw extruder. However, currently sampling is mostly carried out at the extrusion port of the screw extruder, which makes the sampling have a lag. If defects such as uneven mixing of the extruded product occur, it is impossible to clearly determine which stage of the entire double-screw extrusion mechanism caused it, which increases the difficulty of maintenance and repair, thereby affecting the overall production efficiency. In addition, in the double-screw extrusion mechanism, local cavities will exist after sampling, and due to the structure of the double helix, the high-pressure molten material at the feed end cannot be quickly pressed to the sampling cavity, which can easily lead to defects such as holes or cavities in the product molded at the extrusion end. Therefore, a double-screw extrusion mechanism that is easy to sample and detect is proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that in the prior art, sampling is mostly carried out at the extrusion port of the screw extruder, which makes the sampling have a lag. If defects such as uneven mixing of the extruded product occur, it is impossible to clearly determine which stage of the entire twin-screw extrusion mechanism causes the defect, which increases the difficulty of maintenance and repair, thereby affecting the overall production efficiency. A twin-screw extrusion mechanism that is convenient for sampling and testing is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A double-screw extrusion mechanism for convenient sampling and detection comprises a conveying motor and two sampling outer frames, wherein the conveying motor is connected to two screw extrusion shafts through a gear set mechanism, the left and right inner side walls and the lower inner side wall of the sampling outer frame are both provided with sampling holes, the sampling outer frame is provided with a sampling outer groove connected thereto at the position of the sampling hole, the inner side wall of the sampling outer groove is connected with a mounting cavity seat, the inner side walls of the two mounting cavity seats on the left and right sides are both connected with side sealing plates through hydraulic push rods, the inner side wall of the mounting cavity seat located at the bottom is connected with a bottom sealing plate through a hydraulic push rod, and sampling components are arranged below the three mounting cavity seats;

[0007] The upper side wall of the sampling outer frame at one end of the conveying motor is provided with a compensation groove, the inner side wall of the compensation groove is connected with a compensation cover, and the bottom end of the compensation cover is connected with a double-arc compensation pressure plate for compensating the cavity after sampling.

[0008] Preferably, a feed hopper is arranged above the conveying motor, and a feed pressure frame is fixedly connected to the bottom end of the feed hopper, and the feed pressure frame is fixedly connected to the end face of the middle sampling outer frame, and a plurality of supports are fixedly connected to the bottom end of the sampling outer frame, and the end of the sampling outer frame located at the edge is fixedly connected to an extrusion mold cavity.

[0009] Preferably, the inner walls of the sampling holes on the left and right sides of the sampling outer frame are slidably connected to the side walls of the side sealing plate, the inner walls of the sampling holes at the bottom of the sampling outer frame are slidably connected to the bottom sealing plate, and the inner walls of the sampling outer groove are fixedly connected to the outer walls of the mounting cavity seat.

[0010] Preferably, an inner side wall of the inner end of the mounting cavity seat is provided with a suction groove, a smooth flow plate is fixedly connected to the inner side wall of the suction groove, and the inner side wall of the outer end of the mounting cavity seat is fixedly connected to the outer side wall of the fixed end of the hydraulic push rod.

[0011] Preferably, two flow holes interconnected with the suction groove are provided in the mounting cavity seat, and the inner side walls of the two flow holes on the left and right sides are respectively fixedly connected with two side sampling tubes, and the inner side walls of the two flow holes at the bottom are respectively fixedly connected with two bottom sampling tubes.

[0012] Preferably, the sampling assembly consists of a sampling box and a negative pressure air pump, the top of the sampling box is fixedly connected to the negative pressure air pump, the tops of the two sampling boxes located at the edge are fixedly connected to the bottom ends of the side sampling tubes, the top of the sampling box located in the middle is fixedly connected to the bottom end of the bottom sampling tube, and the outer walls of the bottom ends of the side sampling tubes and the bottom sampling tubes are fixedly connected with sealing rings.

[0013] Preferably, the top end of the sampling outer frame is fixedly connected to a top plate via two fixing rods, the bottom end of the top plate is fixedly connected to a retaining inner cover via a fixing plate, and the bottom end of the top plate is fixedly connected to a heat-insulating sealing plate via two electric push rods.

[0014] Preferably, the side wall of the heat-insulating sealing plate is fixedly connected to the inner wall of the compensation cover, the inner wall of the compensation cover is slidably connected to the outer wall of the retaining inner cover, and the bottom end of the compensation cover is fixedly connected to the top end of the double-arc compensation pressure plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This scheme can utilize negative pressure sampling on both sides and in the middle to sample and compare materials transported at different positions in the same conveying stage of the twin-screw extruder mechanism by installing the cavity seat and the sampling assembly, and utilize the front and rear sampling frames to sample separately to achieve comparative sampling of materials transported at the same position in different conveying stages of the twin-screw extruder mechanism, so that sampling and conveying are carried out synchronously, which is convenient for timely discovery of problems arising in the process of mixed material conveying.

[0017] 2. This solution uses the electric push rod and the double-arc compensation plate to compensate for the cavity formed by sampling by using the reciprocating downward pressure of the double-arc compensation plate and the continuous pressure of high-pressure materials at the input end of the entire double-screw extruder mechanism. This ensures that the material after sampling remains in a cavity-free conveying state, ensuring that the double-screw extruder mechanism can still work normally during the sampling process and ensuring the overall conveying production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a double-screw extrusion mechanism for facilitating sampling and testing proposed by the present invention;

[0019] Figure 2 This is a schematic diagram of the assembly of a double-screw extrusion mechanism that is convenient for sampling and testing proposed by the present invention;

[0020] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0021] Figure 4 A schematic diagram of the structure of the positions of the side sealing plates and the bottom sealing plates in a double-screw extrusion mechanism for facilitating sampling and testing proposed by the present invention;

[0022] Figure 5 This is a schematic structural diagram of a cross section of a sampling outer frame in a double-screw extrusion mechanism that is convenient for sampling and testing proposed by the present invention;

[0023] Figure 6 A position relationship diagram of three sampling boxes in a double-screw extrusion mechanism for convenient sampling and testing proposed by the present invention;

[0024] Figure 7 for Figure 6 The enlarged view of point B in the middle;

[0025] Figure 8 This is a schematic diagram of the structure of the suction slot opening position in a double-screw extrusion mechanism for facilitating sampling and testing proposed by the present invention;

[0026] Fig. 9 This is a schematic structural diagram of a double-arc surface compensation pressure plate in a double-screw extrusion mechanism that is convenient for sampling and testing proposed by the present invention;

[0027] Fig.10 The present invention provides a schematic diagram of the structure inside a compensation cover in a double-screw extrusion mechanism that is convenient for sampling and testing.

[0028] In the figure: 1. conveying motor; 2. sampling outer frame; 3. support; 4. extrusion cavity; 5. gear set mechanism; 6. spiral extrusion shaft; 7. cavity mounting seat; 8. hydraulic push rod; 9. side sealing plate; 10. smooth flow plate; 11. side sampling tube; 12. bottom sealing plate; 13. sampling box; 14. negative pressure air pump; 15. bottom sampling tube; 16. sealing ring; 17. top plate; 18. electric push rod; 19. insulation sealing plate; 20. compensation cover; 21. double arc compensation pressure plate; 22. fixed inner cover; 23. feed hopper. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Example, see Figures 1 to 10, a double-screw extrusion mechanism convenient for sampling and testing, comprising a conveying motor 1 and two sampling outer frames 2, the conveying motor 1 is connected to two screw extrusion shafts 6 through a gear set mechanism 5, the left and right inner side walls and the lower inner side wall of the sampling outer frame 2 are both provided with sampling holes, the sampling outer frame 2 is provided with a sampling outer groove connected thereto at the sampling hole position, the inner side wall of the sampling outer groove is connected with a mounting cavity seat 7, the inner side walls of the two mounting cavity seats 7 on the left and right sides are both connected with side sealing plates 9 through hydraulic push rods 8, the inner side wall of the mounting cavity seat 7 located below is connected with a bottom sealing plate 12 through hydraulic push rods 8, and sampling components are arranged below the three mounting cavity seats 7;

[0033] Furthermore, a feed hopper 23 is provided above the conveying motor 1, and a feed pressurizing frame is fixedly connected to the bottom end of the feed hopper 23, and the feed pressurizing frame is fixedly connected to the end face of the middle sampling outer frame 2, and a plurality of supports 3 are fixedly connected to the bottom end of the sampling outer frame 2, and an extrusion mold cavity 4 is fixedly connected to the end of the sampling outer frame 2 located at the edge, and the inner side walls of the sampling holes on the left and right sides of the sampling outer frame 2 are slidably connected to the side walls of the side sealing plate 9, and the inner side walls of the sampling holes at the bottom of the sampling outer frame 2 are slidably connected to the bottom sealing plate 12, and the inner side walls of the sampling outer groove are fixedly connected to the outer side walls of the mounting cavity seat 7, and the inner side wall of the inner end of the mounting cavity seat 7 is provided with a suction groove, and the inner side wall of the suction groove is fixedly connected to a smooth flow plate 10, and the inner side wall of the outer end of the mounting cavity seat 7 It is fixedly connected to the outer wall of the fixed end of the hydraulic push rod 8, and two flow holes that are interconnected with the suction groove are provided in the mounting cavity seat 7. The inner walls of the two flow holes on the left and right sides are respectively fixedly connected to two side sampling tubes 11, and the inner walls of the two flow holes at the bottom are respectively fixedly connected to two bottom sampling tubes 15. The sampling assembly consists of a sampling box 13 and a negative pressure air pump 14. The top of the sampling box 13 is fixedly connected to the negative pressure air pump 14, the tops of the two sampling boxes 13 at the edge are fixedly connected to the bottom ends of the side sampling tubes 11, and the top of the sampling box 13 in the middle is fixedly connected to the bottom end of the bottom sampling tube 15. The outer walls of the bottom ends of the side sampling tubes 11 and the bottom sampling tubes 15 are fixedly connected with sealing rings 16.

[0034] It should be noted that: starting the conveying motor 1 drives the three gears in the gear set mechanism 5 to rotate in turn, and then drives the two spiral extrusion shafts 6 to rotate relative to each other, so as to convey the materials put into the hopper 23, and the injection molding materials are pressurized and heated to be molten and conveyed to the two sampling outer frames 2. This is the prior art and will not be described in detail here. After the extrusion mold cavity 4 can stably extrude the product, the two hydraulic push rods 8 in the sampling outer grooves on both sides of the first sampling outer frame 2 are first started to contract, and the side sealing plates 9 are pulled outward, so that the sampling holes on both sides of the sampling outer frame 2 are opened, and the sampling holes on both sides of the sampling outer frame 2 are opened. The sampling hole is connected with the suction groove. At this time, the side sampling tube 11 is connected with the edge of the left-handed spiral extrusion shaft 6 and the edge of the right-handed spiral extrusion shaft 6 in the sampling outer frame 2 through the condition that the sampling hole and the suction groove are connected. The negative pressure air pump 14 extracts gas to make the sampling boxes 13 and the side sampling tube 11 on both sides in a negative pressure state. Under the above-mentioned connection condition, the molten material transported on both sides of the sampling outer frame 2 will be sucked into the suction groove through the sampling hole, and then sucked into the sampling box 13 through the side sampling tube 11, completing the sampling of the materials transported on the left and right sides of the double-screw extrusion mechanism;

[0035] Then, the hydraulic push rod 8 at the bottom of the sampling outer frame 2 is started to contract, and the suction groove in the bottom mounting cavity seat 7 is connected with the sampling hole at the bottom, and then the suction groove is connected with the bottom sampling tube 15 and the middle sampling box 13, and the conveying material in the middle of the double-screw extruder mechanism is sucked into the sampling box 13 by negative pressure, and the materials on both sides of the sampling outer frame 2 and the middle material are sampled respectively, so that the three cavities after sampling are squeezed into the cavity in the low-pressure state under the rotation of the two spiral extrusion shafts 6, so that the adjacent small cavities contact each other to form an integral sampling cavity, and after the sampling in the first sampling outer frame 2 is completed, the above steps are sampled in another sampling outer frame 2 after a period of time;

[0036] The above advantages are: in this way, negative pressure sampling on both sides and in the middle can be used to sample and compare materials transported at different positions in the same conveying stage of the twin-screw extruder mechanism, and the front and rear sampling outer frames 2 can be used to sample separately to achieve comparative sampling of materials transported at the same position in different conveying stages of the twin-screw extruder mechanism, so that sampling and conveying are carried out synchronously, which is convenient for timely discovery of problems in the process of mixed material conveying;

[0037] A compensation groove is provided on the upper side wall of the sampling outer frame 2 at one end of the conveying motor 1, and a compensation cover 20 is connected to the inner side wall of the compensation groove. A double-arc compensation pressure plate 21 for compensating the cavity after sampling is connected to the bottom end of the compensation cover 20;

[0038] Furthermore, the top of the sampling outer frame 2 is fixedly connected to a top plate 17 through two fixing rods, the bottom of the top plate 17 is fixedly connected to a retaining inner cover 22 through a fixing plate, the bottom of the top plate 17 is fixedly connected to a heat preservation sealing plate 19 through two electric push rods 18, the side wall of the heat preservation sealing plate 19 is fixedly connected to the inner wall of the compensation cover 20, the inner wall of the compensation cover 20 is slidably connected to the outer wall of the retaining inner cover 22, and the bottom end of the compensation cover 20 is fixedly connected to the top of the double-arc compensation pressure plate 21;

[0039] It should be noted that: after the sampling is completed, when the three sampled cavities form an integral cavity, the two electric push rods 18 at the bottom of the top plate 17 are started to push the insulation sealing plate 19 downward, and the insulation sealing plate 19 will drive the double arc compensation pressure plate 21 to move downward through the compensation cover 20, and pressurize the material part of the front section of the cavity after sampling, and press the material in the front section to form a new cavity, and the pressed material will be pressed into the cavity after sampling for compensation, wherein the space between the insulation sealing plate 19 and the double arc compensation pressure plate 21 is set There is a heat-insulating material, and there is no temperature difference inside and outside the large-area double-arc compensation platen 21, and no stress deformation will be generated. During this process, the electric push rod 18 maintains continuous reciprocating downward pressure to gradually compensate for the pressed cavity. Since the material input at the hopper 23 is in a high-pressure state, the high-pressure material at the input end will slowly pass through the double-screw mechanism to continuously fill and compensate the new cavity pressed by the double-arc compensation platen 21, so that the area of ​​the double-arc compensation platen 21 that needs to be pressed and compensated is gradually reduced until the cavity volume is completely compensated;

[0040] The above advantages are as follows: in this way, the reciprocating downward pressure of the double arc surface compensation plate 21 can be utilized to cooperate with the continuous pressing of the high-pressure material at the input end of the entire double screw extrusion mechanism to compensate for the cavity formed by sampling, so that the material after sampling can still be transported in a cavity-free state, ensuring that the double screw extrusion mechanism can still work normally during the sampling process, and ensuring the overall transportation production efficiency;

[0041] When the present invention is in use, the conveying motor 1 is started to drive the three gears in the gear set mechanism 5 to rotate in sequence, and then the two spiral extrusion shafts 6 are driven to rotate relative to each other, so as to convey the materials put into the hopper 23, and the injection molding materials are pressurized and heated to be molten and conveyed to the two sampling outer frames 2. This is the prior art and will not be described in detail here. After the extrusion mold cavity 4 can stably extrude the product, the two hydraulic push rods 8 in the sampling outer grooves on both sides of the first sampling outer frame 2 are first started to contract, and the side sealing plates 9 are pulled outward, so that the sampling holes on both sides of the sampling outer frame 2 are opened, and the sampling holes on both sides of the sampling outer frame 2 are opened. The sampling hole is connected with the suction groove. At this time, the side sampling tube 11 is connected with the edge of the left-handed spiral extrusion shaft 6 and the edge of the right-handed spiral extrusion shaft 6 in the sampling outer frame 2 through the condition that the sampling hole and the suction groove are connected. The negative pressure air pump 14 extracts gas to make the sampling boxes 13 and the side sampling tube 11 on both sides in a negative pressure state. Under the above-mentioned connection condition, the molten material transported on both sides of the sampling outer frame 2 will be sucked into the suction groove through the sampling hole, and then sucked into the sampling box 13 through the side sampling tube 11, completing the sampling of the material transported on the left and right sides of the double-screw extrusion mechanism;

[0042] Then, the hydraulic push rod 8 at the bottom of the sampling outer frame 2 is started to contract, and the suction groove in the bottom mounting cavity seat 7 is connected with the sampling hole at the bottom, and then the suction groove is connected with the bottom sampling tube 15 and the middle sampling box 13, and the conveying material in the middle of the double-screw extruder mechanism is sucked into the sampling box 13 by negative pressure, and the materials on both sides of the sampling outer frame 2 and the middle material are sampled separately, so that the three cavities after sampling are squeezed by the two spiral extrusion shafts 6 under the rotation of the low-pressure state, so that the adjacent small cavities contact each other to form an integral sampling cavity, and after the sampling in the first sampling outer frame 2 is completed, the above steps are sampled in another sampling outer frame 2 after a period of time, so that the negative pressure sampling on both sides and the middle can be used to sample and compare the conveying materials at different positions in the same conveying stage of the double-screw extruder mechanism, and the front and rear sampling outer frames 2 can be used to sample separately to realize the comparative sampling of the conveying materials at the same position in different conveying stages of the double-screw extruder mechanism, so that sampling and conveying are carried out synchronously, which is convenient for timely discovery of problems in the process of mixed material conveying;

[0043] After the sampling is completed, when the three sampled cavities form an integral cavity, the two electric push rods 18 at the bottom of the top plate 17 are started to push the heat preservation sealing plate 19 downward, and the heat preservation sealing plate 19 will drive the double-arc compensation pressure plate 21 to move downward through the compensation cover 20, and pressurize the material part of the front section of the cavity after sampling, and press the material in the front section to form a new cavity, and the pressed material will be pressed into the cavity after sampling for compensation, wherein the space between the heat preservation sealing plate 19 and the double-arc compensation pressure plate 21 is provided with heat preservation material, and the large area of ​​the double-arc compensation pressure plate 21 has no temperature difference inside and outside, and no stress deformation will be generated. During this process, the electric push rod 18 maintains continuous reciprocating downward pressure to press the pressed air The cavity is gradually compensated. Since the material input at the hopper 23 is in a high-pressure state, the high-pressure material at the input end will slowly pass through the double-screw mechanism to continuously fill and compensate the new cavity pressed out by the double-arc compensation plate 21, so that the area that the double-arc compensation plate 21 needs to be pressed and compensated is gradually reduced until the cavity volume is completely compensated. In this way, the reciprocating downward pressure of the double-arc compensation plate 21 can be utilized, and the continuous pressure of the high-pressure material at the input end of the entire double-screw extrusion mechanism can be used to compensate for the cavity formed by sampling, so that the sampled material still maintains a cavity-free conveying state, ensuring that the double-screw extrusion mechanism can still work normally during the sampling process, thereby ensuring the overall conveying production efficiency.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-screw extrusion mechanism for convenient sampling and testing, comprising a conveying motor (1) and two sampling outer frames (2), characterized in that: The conveying motor (1) is connected to two spiral extrusion shafts (6) through a gear set mechanism (5); the left and right inner side walls and the lower inner side wall of the sampling outer frame (2) are both provided with sampling holes; the sampling outer frame (2) is provided with a sampling outer groove connected thereto at the sampling hole position; the inner side wall of the sampling outer groove is connected to a mounting cavity seat (7); the inner side walls of the two mounting cavity seats (7) located on the left and right sides are both connected to side sealing plates (9) through hydraulic push rods (8); the inner side wall of the mounting cavity seat (7) located at the bottom is connected to a bottom sealing plate (12) through a hydraulic push rod (8); and sampling components are provided below the three mounting cavity seats (7); The upper side wall of the sampling outer frame (2) located at one end of the conveying motor (1) is provided with a compensation groove, the inner side wall of the compensation groove is connected to a compensation cover (20), and the bottom end of the compensation cover (20) is connected to a double-arc compensation pressure plate (21) for compensating the cavity after sampling.

2. A double-screw extrusion mechanism for facilitating sampling and testing according to claim 1, characterized in that: A feed hopper (23) is arranged above the conveying motor (1), and a feed pressure frame is fixedly connected to the bottom end of the feed hopper (23), and the feed pressure frame is fixedly connected to the end face of the middle sampling outer frame (2), and a plurality of supports (3) are fixedly connected to the bottom end of the sampling outer frame (2), and an extrusion mold cavity (4) is fixedly connected to the end of the sampling outer frame (2) located at the edge.

3. A double-screw extrusion mechanism for facilitating sampling and testing according to claim 1, characterized in that: The inner side walls of the sampling holes on the left and right sides of the sampling outer frame (2) are slidably connected to the side walls of the side sealing plate (9), the inner side walls of the sampling holes at the bottom of the sampling outer frame (2) are slidably connected to the bottom sealing plate (12), and the inner side walls of the sampling outer groove are fixedly connected to the outer side walls of the mounting cavity seat (7).

4. A double-screw extrusion mechanism for facilitating sampling and testing according to claim 1, characterized in that: The inner side wall of the inner end of the installation cavity seat (7) is provided with a suction groove, the inner side wall of the suction groove is fixedly connected with a smooth flow plate (10), and the inner side wall of the outer end of the installation cavity seat (7) is fixedly connected with the outer side wall of the fixed end of the hydraulic push rod (8).

5. A double-screw extrusion mechanism for facilitating sampling and testing according to claim 4, characterized in that: The mounting cavity seat (7) has two flow holes interconnected with the suction groove, the inner side walls of the two flow holes on the left and right sides are respectively fixedly connected to two side sampling tubes (11), and the inner side walls of the two flow holes at the bottom are respectively fixedly connected to two bottom sampling tubes (15).

6. A double-screw extrusion mechanism for convenient sampling and testing according to claim 1, characterized in that: The sampling assembly is composed of a sampling box (13) and a negative pressure air pump (14); the top of the sampling box (13) is fixedly connected to the negative pressure air pump (14); the tops of the two sampling boxes (13) located at the edge are fixedly connected to the bottom ends of the side sampling tubes (11); the top of the sampling box (13) located in the middle is fixedly connected to the bottom end of the bottom sampling tube (15); and the outer side walls of the bottom ends of the side sampling tubes (11) and the bottom sampling tubes (15) are fixedly connected with sealing rings (16).

7. A double-screw extrusion mechanism for convenient sampling and testing according to claim 1, characterized in that: The top end of the sampling outer frame (2) is fixedly connected to a top plate (17) via two fixing rods, the bottom end of the top plate (17) is fixedly connected to a retaining inner cover (22) via a fixing plate, and the bottom end of the top plate (17) is fixedly connected to a heat-insulating sealing plate (19) via two electric push rods (18).

8. A double-screw extrusion mechanism for convenient sampling and testing according to claim 7, characterized in that: The side wall of the heat-insulating sealing plate (19) is fixedly connected to the inner wall of the compensation cover (20), the inner wall of the compensation cover (20) is slidably connected to the outer wall of the retaining inner cover (22), and the bottom end of the compensation cover (20) is fixedly connected to the top end of the double-arc compensation pressure plate (21).

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