Injection molding equipment for processing HDPE (High-Density Polyethylene) plastic pipeline and use method of injection molding equipment

Abstract

The invention belongs to the technical field of plastic pipeline machining, and discloses injection molding equipment for HDPE plastic pipeline machining and a using method thereof.The injection molding equipment comprises a base, and an injection assembly and a mold closing assembly are arranged at the top of the base. Through cooperation of a first rotating assembly, a limiting block, a second rotating assembly, a first tooth block and other structures, a nozzle assembly is conveniently disassembled and cleaned, then normal operation of the device is guaranteed, the limiting block is driven to retract into the nozzle assembly when a rotating cylinder rotates, then clamping connection with an injection assembly is conveniently removed, and the injection efficiency is improved. A first tooth block is driven by a second round rod and a third round rod to retract into a sleeve, so that clamping connection between a nozzle assembly and a first gear disc is conveniently removed, after clamping connection between the two ends of the nozzle assembly and an injection assembly and between the two ends of the nozzle assembly and a mold closing assembly is removed, the nozzle assembly is conveniently taken out to be cleaned, and then normal operation of the device is guaranteed; and meanwhile, the overall convenience of the device is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic pipe processing, in particular to an injection molding device for HDPE plastic pipe processing and a use method thereof. Background Art

[0002] The processing of HDPE plastic pipes usually adopts injection molding equipment, which is used to heat high-density polyethylene (HDPE) material to a molten state and then inject it into a mold to form the desired pipe shape. Through these equipment, HDPE plastic pipes can be produced efficiently and accurately to meet the needs of different application fields.

[0003] Most of the existing injection molding of HDPE plastic pipe processing is one-piece, and during the plastic injection process, different types of plastics, additives, pigments and other substances may remain inside the barrel and nozzle. Over time, these residues may affect the quality and performance of the plastic, and even cause the discharge port to be blocked. Most of the existing devices are not convenient for disassembling the barrel and the nozzle, which makes it difficult to clean the residue inside the nozzle, thereby affecting the normal operation of the equipment. Therefore, an injection molding device for HDPE plastic pipe processing and a method of using the same are proposed to solve the problems raised in the background technology. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides an injection molding device for HDPE plastic pipe processing and a method for using the same, which has the advantage of convenient disassembly and cleaning of the nozzle.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an injection molding device for processing HDPE plastic pipes, comprising a base, an injection assembly and a clamping assembly are arranged on the top of the base, a nozzle assembly is clamped at one end of the injection assembly close to the clamping assembly, a first rotating assembly and a second rotating assembly are movably connected inside the nozzle assembly, a limiting block is movably connected to the inner ring of the nozzle assembly at 90 degrees, a first round rod is fixedly connected to the side of the limiting block close to the first rotating assembly, a sleeve is movably connected to the end of the nozzle assembly close to the clamping assembly, a first tooth block is arranged at 90 degrees in the inner ring of the nozzle assembly close to one end of the sleeve, a second round rod is fixedly connected to the side of the first tooth block close to the second rotating assembly, a third round rod is movably sleeved on the outside of the second round rod, a filter plate is clamped inside the nozzle assembly, a second gear plate is arranged outside the filter plate, a second tooth block is arranged at 72 degrees in the inner ring of the nozzle assembly, a fourth round rod is arranged on the side of the second tooth block close to the first rotating assembly, and a threaded rod is threadedly connected to the top of the nozzle assembly.

[0006] Preferably, the first rotating component includes a rotating drum, a first arc groove is formed in an annular shape at 72 degrees on one side of the rotating drum close to the second gear plate, the fourth round rod is movably clamped inside the first arc groove, and a second arc groove is formed in an annular shape at 90 degrees on the outer wall of the rotating drum.

[0007] Preferably, the first round rod is movably clamped inside the second arc groove, the limit block passes through the outer wall of the nozzle assembly and extends to the outside of the nozzle assembly, and the limit block is initially clamped inside the injection assembly.

[0008] Preferably, the second rotating component includes a turntable, a fourth arc-shaped groove is provided on the surface of the turntable in an annular manner at 90 degrees, one end of the third round rod away from the second round rod is movably clamped in the inside of the fourth arc-shaped groove, and the inner wall of the nozzle assembly is provided with a straight groove matching the third round rod, and the straight groove is used to circumferentially limit the third round rod when the turntable rotates.

[0009] Preferably, the sleeve passes through the outer wall of the nozzle assembly and extends to the outside of the nozzle assembly. A spring is fixedly connected to the side of the sleeve away from the clamping assembly. The spring is fixed to the nozzle assembly and is used to squeeze the sleeve and keep the sleeve moving toward the clamping assembly.

[0010] Preferably, the first gear plate is fixedly connected to the outside of the mold clamping assembly near one end of the nozzle assembly, the first tooth block penetrates the outer wall of the sleeve and extends to the outside of the sleeve, and the first tooth block is clamped with the first gear plate in the initial state.

[0011] Preferably, the top end of the threaded rod passes through the outer wall of the nozzle assembly and extends to the outside of the nozzle assembly, and the bottom end of the threaded rod is movably clamped inside the second tooth block at the top, and the side of the second tooth block at the top away from the fourth round rod is fixedly connected to the fifth round rod.

[0012] Preferably, a third arc groove cooperating with the fifth round rod is opened on the surface of the turntable, the fifth round rod is movably engaged in the inside of the third arc groove, the third arc groove and the fourth arc groove have the same orientation, and the second tooth block is engaged with the second gear plate in the initial state.

[0013] Preferably, the injection assembly consists of a feeding hopper, a spiral conveying rod, a barrel and a heating ring, and the inner wall of the nozzle assembly is conical.

[0014] The present application also proposes an injection molding method for processing HDPE plastic pipes, the steps of which are as follows:

[0015] S1. By rotating the threaded rod, the second tooth block and the fourth and fifth round rods on both sides thereof are driven to move in a direction away from the second gear plate, so that the fourth round rod slides along the track of the first arc groove and the rotating drum rotates. After the rotating drum rotates, the first round rod slides along the track of the second arc groove, so that the limit block is retracted into the nozzle assembly and is released from the clamping connection with the injection assembly;

[0016] S2, the fifth round rod moves and slides along the track of the third arc groove, so that the turntable rotates, and then drives the third round rod to move along the track of the fourth arc groove. When the third round rod moves, it drives the first tooth block to move in the same direction through the second round rod, so that the first tooth block is released from the first gear plate;

[0017] S3. While the drum rotates, several fourth round rods slide along the corresponding first arc grooves respectively, so that the five second tooth blocks are all retracted into the interior of the nozzle assembly, thereby releasing the engagement between the second tooth blocks and the second gear plate, thereby facilitating the removal of the filter plate from the interior of the nozzle assembly for replacement.

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

[0019] The present invention facilitates the disassembly and cleaning of the nozzle assembly through the cooperation between the first rotating assembly, the limit block, the second rotating assembly and the first tooth block, thereby ensuring the normal operation of the device. The first round rod is movably connected to the inside of the second arc groove, so that when the rotating drum rotates, the limit block is driven by the first round rod to shrink into the nozzle assembly, thereby facilitating the disengagement from the injection assembly. When the turntable rotates, the first tooth block is driven by the second round rod and the third round rod to shrink to the inside of the sleeve, thereby facilitating the disengagement of the nozzle assembly from the first gear plate. The sleeve is movably connected to the nozzle assembly, thereby facilitating the sleeve to be pressed into the inside of the nozzle assembly, thereby removing the sleeve from blocking the connection between the nozzle assembly and the clamping assembly. After the two ends of the nozzle assembly are respectively disengaged from the injection assembly and the clamping assembly, the nozzle assembly can be conveniently taken out for cleaning, thereby ensuring the normal operation of the device and improving the overall convenience of the device.

[0020] The present invention facilitates the disassembly and replacement of the filter plate by the cooperation between the first rotating component, the second gear plate, the second tooth block and the threaded rod. The bottom end of the threaded rod is movably connected to the inside of the second tooth block, so that the second tooth block is driven to move in the direction away from the second gear plate when the threaded rod rotates. The fourth round rod is movably connected to the inside of the first arc groove, so that when a fourth round rod moves, it drives the rotating drum to rotate, and then drives several fourth round rods to slide along the tracks of several first arc grooves, so that the five second tooth blocks are all retracted into the nozzle assembly, and then the clamping connection with the filter plate is released, so that the filter plate is conveniently taken out of the nozzle assembly for replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the front cross-section structure of the present invention;

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0025] Figure 5 It is an exploded view of the filter plate of the present invention;

[0026] Figure 6 It is a schematic diagram of the positional relationship among the second rotating assembly, the sleeve, the first tooth block and the first gear plate of the present invention.

[0027] In the figure: 1. base; 2. injection assembly; 3. clamping assembly; 4. nozzle assembly; 5. first rotating assembly; 501. rotating drum; 502. first arc-shaped groove; 503. second arc-shaped groove; 6. limit block; 7. first round rod; 8. second rotating assembly; 801. rotating disk; 802. third arc-shaped groove; 803. fourth arc-shaped groove; 9. sleeve; 10. spring; 11. first tooth block; 12. second round rod; 13. third round rod; 14. first gear plate; 15. filter plate; 16. second gear plate; 17. second tooth block; 18. fourth round rod; 19. threaded rod; 20. fifth round rod. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figures 1 to 6 As shown, the present invention provides an injection molding device for processing HDPE plastic pipes, including a base 1, an injection assembly 2 and a clamping assembly 3 are arranged on the top of the base 1, a nozzle assembly 4 is clamped at one end of the injection assembly 2 close to the clamping assembly 3, a first rotating assembly 5 and a second rotating assembly 8 are movably connected inside the nozzle assembly 4, a limiting block 6 is movably connected to the inner ring of the nozzle assembly 4 at 90 degrees, a first round rod 7 is fixedly connected to the side of the limiting block 6 close to the first rotating assembly 5, a sleeve 9 is movably connected to one end of the nozzle assembly 4 close to the clamping assembly 3, and the nozzle assembly A first tooth block 11 is arranged at an angle of 90 degrees in the inner ring near one end of the sleeve 9, a second round rod 12 is fixedly connected to the side of the first tooth block 11 near the second rotating assembly 8, a third round rod 13 is movably sleeved on the outside of the second round rod 12, a filter plate 15 is clamped inside the nozzle assembly 4, a second gear plate 16 is arranged outside the filter plate 15, a second tooth block 17 is arranged at an angle of 72 degrees in the inner ring of the nozzle assembly 4, a fourth round rod 18 is arranged on the side of the second tooth block 17 near the first rotating assembly 5, and a threaded rod 19 is threadedly connected to the top of the nozzle assembly 4.

[0030] The above scheme is adopted: the first round rod 7 is movably connected to the inside of the second arc groove 503, so that when the rotating drum 501 rotates, the first round rod 7 drives the limit block 6 to retract into the nozzle assembly 4, thereby facilitating the unblocking of the injection assembly 2; the third round rod 13 is movably connected to the inside of the fourth arc groove 803, so that when the turntable 801 rotates, the third round rod 13 drives the second round rod 12 and the first tooth block 11 at one end thereof to move, thereby causing the first tooth block 11 to retract into the sleeve 9 and be unblocked from the first gear plate 14; the sleeve 9 is movably connected to the nozzle assembly 4, thereby facilitating the sleeve 9 to be pressed into the inside of the nozzle assembly 4, thereby releasing the sleeve 9 from blocking the connection between the nozzle assembly 4 and the clamping assembly 3; after the two ends of the nozzle assembly 4 are respectively unblocked from the injection assembly 2 and the clamping assembly 3, the nozzle assembly 4 can be conveniently taken out for cleaning, thereby ensuring the normal operation of the device and improving the overall convenience of the device.

[0031] like Figure 2 , Figures 4 to 5 As shown, the first rotating component 5 includes a rotating drum 501, and a first arc groove 502 is opened in a ring shape of 72 degrees on one side of the rotating drum 501 close to the second gear plate 16, the fourth round rod 18 is movably clamped in the first arc groove 502, and a second arc groove 503 is opened in a ring shape of 90 degrees on the outer wall of the rotating drum 501, the first round rod 7 is movably clamped in the second arc groove 503, the limit block 6 passes through the outer wall of the nozzle assembly 4 and extends to the outside of the nozzle assembly 4, and the limit block 6 is initially clamped in the inside of the injection assembly 2.

[0032] The above scheme is adopted: the bottom end of the threaded rod 19 is movably connected to the inside of the second tooth block 17, so that when the threaded rod 19 rotates, the second tooth block 17 is driven to move in the direction away from the second gear plate 16, and the fourth round rod 18 is movably connected to the inside of the first arc groove 502, so that when a fourth round rod 18 moves, it drives the rotating drum 501 to rotate, and then drives several fourth round rods 18 to slide along the tracks of several first arc grooves 502, so that the five second tooth blocks 17 are all retracted into the nozzle assembly 4, and then the connection with the filter plate 15 is released, so that the filter plate 15 is conveniently taken out of the nozzle assembly 4 for replacement.

[0033] like Figure 6 As shown, the second rotating component 8 includes a turntable 801, and a fourth arc groove 803 is provided on the surface of the turntable 801 in an annular manner at ninety degrees. The end of the third round rod 13 away from the second round rod 12 is movably clamped in the fourth arc groove 803, and the inner wall of the nozzle assembly 4 is provided with a straight groove matching the third round rod 13. When the turntable 801 rotates, the straight groove is used to circumferentially limit the third round rod 13. The sleeve 9 passes through the outer wall of the nozzle assembly 4 and extends to the outside of the nozzle assembly 4. The side of the sleeve 9 away from the clamping assembly 3 is fixedly connected with a spring 10, and the spring 10 is fixedly connected to the nozzle assembly 4. The spring 10 is used to squeeze the sleeve 9 and keep the sleeve 9 moving toward the clamping assembly 3.

[0034] The above scheme is adopted: through the design of the spring 10, its function is that when the nozzle assembly 4 needs to be installed, the sleeve 9 is pressed into the inside of the nozzle assembly 4, and the first tooth block 11 is re-engaged with the first gear plate 14. At this time, the operator releases the pressure on the sleeve 9, so that the sleeve 9 is reset under the action of the elastic force of the spring 10, and then the connection between the mold assembly 3 and the nozzle assembly 4 is re-covered, thereby improving the overall sealing and stability of the device.

[0035] like Figure 1 to Figure 2 , Figures 4 to 6As shown, the outside of the clamping assembly 3 near one end of the nozzle assembly 4 is fixedly connected with the first gear plate 14, the first tooth block 11 penetrates the outer wall of the sleeve 9 and extends to the outside of the sleeve 9, the first tooth block 11 is clamped with the first gear plate 14 in the initial state, the top of the threaded rod 19 penetrates the outer wall of the nozzle assembly 4 and extends to the outside of the nozzle assembly 4, the bottom end of the threaded rod 19 is movably clamped in the inside of the second tooth block 17 at the top, and the side of the second tooth block 17 at the top away from the fourth round rod 18 is fixedly connected with the fifth round rod 20, the surface of the turntable 801 is provided with a third arc groove 802 that matches the fifth round rod 20, the fifth round rod 20 is movably clamped in the inside of the third arc groove 802, the third arc groove 802 and the fourth arc groove 803 are oriented in the same direction, the second tooth block 17 is clamped with the second gear plate 16 in the initial state, the injection assembly 2 is composed of a feeding funnel, a spiral conveying rod, a barrel and a heating ring, and the inner wall of the nozzle assembly 4 is conical.

[0036] The above scheme is adopted: the interior of the nozzle assembly 4 is in a conical shape. Its function is that the conical shape makes the inside of the nozzle assembly 4 gradually transition from the larger diameter connected to the injection assembly 2 to the smaller diameter of the discharge port. This shape can guide the plastic melt to flow more smoothly from the nozzle assembly 4 to the discharge port, reducing the flow resistance. Under the guidance of the conical inner wall, the plastic can flow in a more orderly manner to avoid turbulence or blockage.

[0037] The working principle and use process of the present invention are as follows: when it is necessary to clean the inside of the nozzle assembly 4, the operator rotates the threaded rod 19, thereby driving the second tooth block 17 at the bottom thereof to move in a direction away from the second gear plate 16. When the second tooth block 17 moves, it drives the fourth round rod 18 thereon to move in the same direction, so that the fourth round rod 18 slides along the trajectory of the first arc groove 502, thereby driving the rotating drum 501 to rotate. When the rotating drum 501 rotates, it drives the first round rod 7 to slide along the trajectory of the second arc groove 503. When the fourth round rod 18 abuts against the inner wall of the first arc groove 502, the first round rod 7 drives the limit block 6 to retract to the inside of the nozzle assembly 4 through the second arc groove 503, so that the limit block 6 is released from the clamping connection with the injection assembly 2.

[0038] When the threaded rod 19 drives the second tooth block 17 at the top to move, the second tooth block 17 drives the fifth round rod 20 on one side thereof to slide along the track of the third arc groove 802, and then the fifth round rod 20 cooperates with the third arc groove 802, so that the turntable 801 rotates. When the turntable 801 rotates, the third round rod 13 is driven to slide along the track of the fourth arc groove 803, so that the second round rod 12 and the first tooth block 11 at one end thereof are driven to move in a direction away from the first gear plate 14 through the third round rod 13. The third round rod 13 abuts against the inner wall of the fourth arc-shaped groove 803. At this time, the first tooth block 11 is completely retracted into the sleeve 9 and is released from the first gear plate 14. Then, the operator presses the sleeve 9, so that it drives the first tooth block 11 to move toward the inside of the nozzle assembly 4. When the sleeve 9 is completely retracted into the nozzle assembly 4, the sleeve 9 releases the shielding of the connection between the clamping assembly 3 and the nozzle assembly 4, so that the operator can remove the nozzle assembly 4 from the injection assembly 2, and then the inside of the nozzle assembly 4 can be cleaned and maintained.

[0039] While the rotating drum 501 is rotating, it also drives the five fourth round rods 18 to slide along the tracks of the five first arc-shaped grooves 502, and then drives the remaining four second tooth blocks 17 to move in the direction away from the second gear plate 16 through the fourth round rods 18. When the five second tooth blocks 17 are all retracted into the interior of the nozzle assembly 4, the second gear plate 16 and the nozzle assembly 4 are released from the engagement, thereby facilitating the removal of the filter plate 15 from the interior of the nozzle assembly 4, and then facilitating the replacement and disassembly of the filter plate 15.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding device for processing HDPE plastic pipes, comprising a base (1), characterized in that: An injection assembly (2) and a clamping assembly (3) are arranged on the top of the base (1); a nozzle assembly (4) is clamped on one end of the injection assembly (2) close to the clamping assembly (3); a first rotating assembly (5) and a second rotating assembly (8) are movably connected inside the nozzle assembly (4); an internal annular 90-degree movably connected limit block (6) is provided on the inner side of the nozzle assembly (4); a first round rod (7) is fixedly connected to one side of the limit block (6) close to the first rotating assembly (5); a sleeve (9) is movably connected to one end of the nozzle assembly (4) close to the clamping assembly (3); an internal annular 90-degree movably connected limit block (6) is provided on the inner side of the nozzle assembly (4) close to the sleeve (9); A first tooth block (11) is provided at a certain angle, a second round rod (12) is fixedly connected to the first tooth block (11) on a side close to the second rotating assembly (8), a third round rod (13) is movably sleeved on the outside of the second round rod (12), a filter plate (15) is clamped inside the nozzle assembly (4), a second gear plate (16) is provided on the outside of the filter plate (15), a second tooth block (17) is provided in an annular shape at a seventy-two degree angle inside the nozzle assembly (4), a fourth round rod (18) is provided on the side close to the first rotating assembly (5), and a threaded rod (19) is threadedly connected to the top of the nozzle assembly (4).

2. The injection molding equipment for HDPE plastic pipe processing according to claim 1, characterized in that: The first rotating assembly (5) comprises a rotating drum (501), a first arcuate groove (502) is provided in an annular manner at a 72-degree angle on one side of the rotating drum (501) close to the second gear plate (16), the fourth round rod (18) is movably engaged in the interior of the first arcuate groove (502), and a second arcuate groove (503) is provided in an annular manner at a 90-degree angle on the outer wall of the rotating drum (501).

3. The injection molding equipment for HDPE plastic pipe processing according to claim 2 is characterized in that: The first round rod (7) is movably clamped inside the second arc groove (503), the limit block (6) passes through the outer wall of the nozzle assembly (4) and extends to the outside of the nozzle assembly (4), and the limit block (6) is clamped inside the injection assembly (2) in the initial state.

4. The injection molding equipment for HDPE plastic pipe processing according to claim 1, characterized in that: The second rotating component (8) comprises a rotating disk (801), the surface of which is provided with a fourth arcuate groove (803) in an annular manner at ninety degrees, one end of the third round rod (13) away from the second round rod (12) is movably clamped in the fourth arcuate groove (803), and the inner wall of the nozzle component (4) is provided with a straight groove opening matching the third round rod (13), and the straight groove opening is used to circumferentially limit the third round rod (13) when the rotating disk (801) rotates.

5. The injection molding equipment for HDPE plastic pipe processing according to claim 1, characterized in that: The sleeve (9) passes through the outer wall of the nozzle assembly (4) and extends to the outside of the nozzle assembly (4). A spring (10) is fixedly connected to the side of the sleeve (9) away from the clamping assembly (3). The spring (10) is fixed to the nozzle assembly (4). The spring (10) is used to squeeze the sleeve (9) and keep the sleeve (9) moving toward the clamping assembly (3).

6. The injection molding equipment for HDPE plastic pipe processing according to claim 1, characterized in that: A first gear plate (14) is fixedly connected to the outside of the mold clamping assembly (3) near one end of the nozzle assembly (4); the first tooth block (11) penetrates the outer wall of the sleeve (9) and extends to the outside of the sleeve (9); the first tooth block (11) is engaged with the first gear plate (14) in an initial state.

7. The injection molding equipment for HDPE plastic pipe processing according to claim 1, characterized in that: The top end of the threaded rod (19) penetrates the outer wall of the nozzle assembly (4) and extends to the outside of the nozzle assembly (4); the bottom end of the threaded rod (19) is movably clamped in the interior of the second tooth block (17) at the top end; and the side of the second tooth block (17) at the top end away from the fourth round rod (18) is fixedly connected to the fifth round rod (20).

8. The injection molding equipment for HDPE plastic pipe processing according to claim 4, characterized in that: The surface of the rotating disk (801) is provided with a third arc groove (802) matched with the fifth round rod (20); the fifth round rod (20) is movably engaged in the interior of the third arc groove (802); the third arc groove (802) and the fourth arc groove (803) are oriented in the same direction; and the second tooth block (17) is engaged with the second gear disk (16) in an initial state.

9. The injection molding equipment for HDPE plastic pipe processing according to claim 1, characterized in that: The injection assembly (2) is composed of a feeding hopper, a spiral conveying rod, a barrel and a heating ring, and the inner wall of the nozzle assembly (4) is in a cone shape.

10. A method for using injection molding for processing HDPE plastic pipes, applied to the injection molding equipment for processing HDPE plastic pipes according to claims 1-9, characterized in that: The steps are as follows: S1. By rotating the threaded rod (19), the second tooth block (17) and the fourth round rod (18) and the fifth round rod (20) on both sides thereof are driven to move in a direction away from the second gear plate (16), thereby causing the fourth round rod (18) to slide along the track of the first arc groove (502) and causing the rotating drum (501) to rotate. After the rotating drum (501) rotates, the first round rod (7) slides along the track of the second arc groove (503), thereby causing the limit block (6) to shrink into the nozzle assembly (4) and release the clamping connection with the injection assembly (2); S2, the fifth round rod (20) moves while sliding along the track of the third arc groove (802), thereby causing the rotating disk (801) to rotate, thereby driving the third round rod (13) to move along the track of the fourth arc groove (803), and when the third round rod (13) moves, it drives the first tooth block (11) to move in the same direction through the second round rod (12), thereby releasing the engagement between the first tooth block (11) and the first gear plate (14); S3. While the rotating drum (501) is rotating, a plurality of fourth round rods (18) slide along the corresponding first arc-shaped grooves (502), thereby causing the five second tooth blocks (17) to be retracted into the interior of the nozzle assembly (4), thereby releasing the engagement between the second tooth blocks (17) and the second gear plate (16), thereby facilitating the removal of the filter plate (15) from the interior of the nozzle assembly (4) for replacement.

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