Injection molding apparatus for HDPE plastic pipe processing and method of use thereof

Abstract

The application belongs to the technical field of plastic pipe processing, and discloses injection molding equipment for HDPE plastic pipe processing and a use method thereof, which comprises a base, the top of the base is provided with an injection assembly and a mold clamping assembly. Through the cooperation between the first rotating assembly, the limiting block, the second rotating assembly and the first tooth block, the nozzle assembly can be conveniently disassembled and cleaned, thereby ensuring the normal operation of the device. When the rotating drum drives the limiting block to shrink into the nozzle assembly, the injection assembly is conveniently uncoupled. The first tooth block is driven by the second circular rod and the third circular rod to shrink into the sleeve, thereby conveniently uncoupling the nozzle assembly and the first gear plate. After the two ends of the nozzle assembly are uncoupled with the injection assembly and the mold 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.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plastic pipe processing, and particularly relates to an injection molding equipment for HDPE plastic pipe processing and a use method thereof. BACKGROUND

[0002] The processing of HDPE plastic pipes usually adopts injection molding equipment, which is used for heating high-density polyethylene (HDPE) material to a molten state and then injecting it into a mold to form a required pipe shape. Through these equipment, HDPE plastic pipes can be efficiently and accurately produced to meet the needs of different application fields. Most of the existing injection molding for HDPE plastic pipe processing is integrated, and during the plastic injection process, different types of plastics, additives, pigments and other substances may be left in 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. However, most of the existing devices are not convenient for disassembling the barrel and nozzle, which makes it difficult to clean the residues inside the nozzle, thereby affecting the normal operation of the equipment. Therefore, the injection molding equipment for HDPE plastic pipe processing and the use method thereof are proposed to solve the problems raised in the background. SUMMARY

[0003] To solve the problems raised in the background, the application provides an injection molding equipment for HDPE plastic pipe processing and a use method thereof, which has the advantages of facilitating disassembly and cleaning of the nozzle.

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme: an injection molding equipment for HDPE plastic pipe processing, comprising a base, an injection assembly and a mold closing assembly are arranged on the top of the base, a nozzle assembly is connected to one end of the injection assembly close to the mold closing assembly, a first rotating assembly and a second rotating assembly are movably connected in the nozzle assembly, a limiting block is movably connected in the nozzle assembly at intervals of 90 degrees, a first circular rod is fixedly connected to one side of the limiting block close to the first rotating assembly, a sleeve is movably connected to one end of the nozzle assembly close to the mold closing assembly, a first tooth block is arranged in the nozzle assembly at intervals of 90 degrees close to the sleeve, a second circular rod is fixedly connected to one side of the first tooth block close to the second rotating assembly, a third circular rod is movably sleeved outside the second circular rod, a filter screen plate is connected to the inside of the nozzle assembly, a second gear disc is arranged outside the filter screen plate, a second tooth block is arranged in the nozzle assembly at intervals of 72 degrees, a fourth circular rod is arranged on one 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.

[0005] Preferably, the first rotating component comprises a rotating drum, a first arc-shaped slot is arranged on the rotating drum in a ring shape and at an equal angle of 72 degrees on one side of the second gear plate, the fourth circular rod is movably connected in the first arc-shaped slot, and a second arc-shaped slot is arranged on the outer wall of the rotating drum in a ring shape and at an equal angle of 90 degrees.

[0006] Preferably, the first circular rod is movably connected in the second arc-shaped slot, the limiting block penetrates through the outer wall of the nozzle assembly and extends to the outside of the nozzle assembly, and the limiting block is connected in the injection assembly in an initial state.

[0007] Preferably, the second rotating component comprises a rotating disc, a fourth arc-shaped slot is arranged on the surface of the rotating disc in a ring shape and at an equal angle of 90 degrees, the third circular rod is movably connected in the fourth arc-shaped slot away from one end of the second circular rod, a straight slot is arranged on the inner wall of the nozzle assembly and matched with the third circular rod, and the straight slot is used for circumferential limiting of the third circular rod when the rotating disc rotates.

[0008] Preferably, the sleeve penetrates through the outer wall of the nozzle assembly and extends to the outside of the nozzle assembly, the spring is fixedly connected to the nozzle assembly away from one side of the die assembly, the spring is used for extruding the sleeve and making the sleeve keep a trend of moving towards the die assembly.

[0009] Preferably, the die assembly is fixedly connected with the first gear plate on the outside of one end close to the nozzle assembly, the first tooth block penetrates through the outer wall of the sleeve and extends to the outside of the sleeve, and the first tooth block is connected with the first gear plate in an initial state.

[0010] Preferably, the top end of the threaded rod penetrates through the outer wall of the nozzle assembly and extends to the outside of the nozzle assembly, the bottom end of the threaded rod is movably connected in the top end of the second tooth block, and the fifth circular rod is fixedly connected to one side of the second tooth block away from the fourth circular rod.

[0011] Preferably, the surface of the rotating disc is arranged with a third arc-shaped slot matched with the fifth circular rod, the fifth circular rod is movably connected in the third arc-shaped slot, the third arc-shaped slot and the fourth arc-shaped slot are in the same direction, and the second tooth block is connected with the second gear plate in an initial state.

[0012] Preferably, the injection assembly is composed of a feeding hopper, a spiral conveying rod, a barrel and a heating ring, and the inner wall of the nozzle assembly is in a conical shape.

[0013] The application further provides a use method of the injection molding for HDPE plastic pipe processing, and the steps are as follows:

[0014] S1, by rotating the threaded rod, thereby driving the second tooth block and the fourth and fifth round rods on its two sides to move away from the second gear disc, thereby making the fourth round rod slide along the trajectory of the first arc-shaped groove, and making the rotating drum rotate, after the rotating drum rotates, the first round rod slides along the trajectory of the second arc-shaped groove, thereby making the limiting block retract into the nozzle assembly and disengaging the injection assembly;

[0015] S2, the fifth round rod moves along the trajectory of the third arc-shaped groove, thereby making the rotating disc rotate, thereby driving the third round rod to move along the trajectory of the fourth arc-shaped groove, when the third round rod moves, the second round rod drives the first tooth block to move in the same direction, thereby making the first tooth block disengage with the first gear disc;

[0016] S3, while the rotating drum rotates, a plurality of fourth round rods respectively slide along the corresponding first arc-shaped grooves, thereby making the five second tooth blocks retract into the interior of the nozzle assembly, thereby making the second tooth blocks disengage with the second gear disc, thereby facilitating the filter screen plate to be taken out from the nozzle assembly for replacement.

[0017] Compared with the prior art, the beneficial effects of the present application are as follows:

[0018] The present application cooperates between the first rotating assembly, the limiting block, the second rotating assembly and the first tooth block and other structures, thereby facilitating the disassembly and cleaning of the nozzle assembly, thereby ensuring the normal operation of the device, the first round rod is movably connected in the interior of the second arc-shaped groove, thereby making the limiting block retract into the nozzle assembly when the rotating drum rotates, thereby facilitating the disengagement with the injection assembly, when the rotating disc rotates, the first tooth block retracts into the sleeve interior under the driving of the second and third round rods, thereby facilitating the disengagement of the nozzle assembly with the first gear disc, the sleeve is movably connected with the nozzle assembly, thereby facilitating the sleeve to be pressed into the interior of the nozzle assembly, thereby making the sleeve disengage from the shielding of the connection between the nozzle assembly and the clamping assembly, after the two ends of the nozzle assembly disengage with the injection assembly and the clamping assembly, thereby facilitating the nozzle assembly to be taken out for cleaning, thereby ensuring the normal operation of the device, while improving the overall convenience of the device. The present application cooperates between the first rotating assembly, the second gear disc, the second tooth block and the threaded rod and other structures, thereby facilitating the disassembly and replacement of the filter screen plate, the bottom end of the threaded rod is movably connected in the interior of the second tooth block, thereby facilitating the threaded rod to move in the direction away from the second gear disc when rotating, the fourth round rod is movably connected in the interior of the first arc-shaped groove, thereby making the rotating drum rotate when one fourth round rod moves, thereby driving a plurality of fourth round rods to slide along the trajectories of a plurality of first arc-shaped grooves, thereby making the five second tooth blocks retract into the nozzle assembly, thereby disengaging with the filter screen plate, thereby facilitating the filter screen plate to be taken out from the nozzle assembly for replacement. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The overall structure of the present application is shown in the schematic diagram.

[0020] Figure 2 The overall structure of the present application is shown in the schematic diagram.

[0021] Figure 3 The overall structure of the present application is shown in the schematic diagram. Figure 2 The enlarged view of A in the middle.

[0022] Figure 4 The enlarged view of B in the middle. Figure 2 The enlarged view of B in the middle.

[0023] Figure 5 The exploded view of the filter screen plate of the present application.

[0024] Figure 6 The schematic diagram of the position relationship of the second rotating assembly, sleeve, first tooth block and first gear plate of the present application. In the figure: 1, base; 2, injection assembly; 3, mold closing assembly; 4, nozzle assembly; 5, first rotating assembly; 501, rotating cylinder; 502, first arc-shaped groove; 503, second arc-shaped groove; 6, limiting block; 7, first circular rod; 8, second rotating assembly; 801, rotating disc; 802, third arc-shaped groove; 803, fourth arc-shaped groove; 9, sleeve; 10, spring; 11, first tooth block; 12, second circular rod; 13, third circular rod; 14, first gear plate; 15, filter screen plate; 16, second gear plate; 17, second tooth block; 18, fourth circular rod; 19, threaded rod; 20, fifth circular rod. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] As Figures 1 to 6As shown in the figure, the present application provides a kind of injection molding equipment for HDPE plastic pipe processing, including base 1, the top of base 1 is provided with injection assembly 2 and mold clamping assembly 3, one end of injection assembly 2 is connected with nozzle assembly 4 by clamping, first rotating assembly 5 and second rotating assembly 8 are movably connected in the inside of nozzle assembly 4, limit block 6 is movably connected in the inside of nozzle assembly 4 annularly and ninety degrees, first round bar 7 is fixedly connected with one side of limit block 6 close to first rotating assembly 5, nozzle assembly 4 is movably connected with sleeve 9 at one end close to mold clamping assembly 3, first tooth block 11 is provided with nozzle assembly 4 annularly and ninety degrees at one end close to sleeve 9, second round bar 12 is fixedly connected with one side of first tooth block 11 close to second rotating assembly 8, third round bar 13 is movably sleeved with the outside of second round bar 12, filter screen plate 15 is clamped in the inside of nozzle assembly 4, second gear disc 16 is provided with the outside of filter screen plate 15, second tooth block 17 is provided with nozzle assembly 4 annularly and seventy-two degrees, fourth round bar 18 is provided with one side of second tooth block 17 close to first rotating assembly 5, threaded rod 19 is screw-connected with the top of nozzle assembly 4.

[0027] By the above scheme: by first round bar 7 movably clamped in the inside of second arc-shaped groove 503, so that when rotating drum 501 rotates, limit block 6 is retracted into nozzle assembly 4 by first round bar 7, and then injection assembly 2 is conveniently disengaged, third round bar 13 is movably clamped in the inside of fourth arc-shaped groove 803, so that when rotating disc 801 rotates, second round bar 12 and first tooth block 11 at one end thereof are moved by third round bar 13, so that first tooth block 11 is retracted into the inside of sleeve 9 and disengaged from first gear disc 14, and nozzle assembly 4 is movably connected with sleeve 9, so that sleeve 9 is conveniently pressed into the inside of nozzle assembly 4, so that sleeve 9 disengages the shielding of the connection between nozzle assembly 4 and mold clamping assembly 3, and after the two ends of nozzle assembly 4 are disengaged from injection assembly 2 and mold clamping assembly 3, nozzle assembly 4 is conveniently taken out for cleaning, so as to ensure the normal operation of the device and improve the overall convenience of the device.

[0028] As shown in Figure 2 , Figures 4 to 5 , first rotating assembly 5 includes rotating drum 501, rotating drum 501 is annularly and seventy-two degrees provided with first arc-shaped groove 502 at one side close to second gear disc 16, fourth round bar 18 is movably clamped in the inside of first arc-shaped groove 502, rotating drum 501 is annularly and ninety degrees provided with second arc-shaped groove 503 on the outer wall, first round bar 7 is movably clamped in the inside of second arc-shaped groove 503, limit block 6 penetrates the outer wall of nozzle assembly 4 and extends to the outside of nozzle assembly 4, and limit block 6 is clamped in the inside of injection assembly 2 in the initial state.

[0029] Adopting the above scheme: through the bottom end of the threaded rod 19 movably clamped in the inside of the second tooth block 17, so as to facilitate the threaded rod 19 to drive the second tooth block 17 to move away from the second gear plate 16 when rotating, through the fourth circular rod 18 movably clamped in the inside of the first arc-shaped groove 502, so that one fourth circular rod 18 moves to drive the rotating drum 501 to rotate, and in turn drives several fourth circular rods 18 to slide along the trajectories of several first arc-shaped grooves 502, so that the five second tooth blocks 17 are all retracted into the nozzle assembly 4, and in turn the clamping with the filter screen plate 15 is released, so as to facilitate taking out the filter screen plate 15 from the nozzle assembly 4 for replacement.

[0030] As shown in Figure 6 The second rotating assembly 8 comprises a rotating disc 801, and a fourth arc-shaped groove 803 is formed in the surface of the rotating disc 801 at intervals of 90 degrees. An end of the third circular rod 13 away from the second circular rod 12 is movably clamped in the fourth arc-shaped groove 803. A straight slot is formed in the inner wall of the nozzle assembly 4 and cooperates with the third circular rod 13. The straight slot is used for circumferentially limiting the third circular rod 13 when the rotating disc 801 rotates. The sleeve 9 penetrates through the outer wall of the nozzle assembly 4 and extends to the outside of the nozzle assembly 4. The sleeve 9 is fixedly connected with the spring 10 on the side away from the mold assembly 3. The spring 10 is fixed to the nozzle assembly 4. The spring 10 is used for pressing the sleeve 9 and making the sleeve 9 keep a tendency of moving towards the mold assembly 3.

[0031] Adopting the above scheme: through the design of the spring 10, when the nozzle assembly 4 needs to be installed, the sleeve 9 is pressed into the inside of the nozzle assembly 4, and after the first tooth block 11 is re-clamped with the first gear plate 14, the operator releases the pressing of the sleeve 9, so that the sleeve 9 is reset under the elastic force of the spring 10, and in turn the connection between the mold assembly 3 and the nozzle assembly 4 is re-occluded, and in turn the sealing property and stability of the whole device are improved.

[0032] As shown in Figures 1 to 2 , Figures 4 to 6As shown, the first gear disc 14 is fixedly connected to the outside of the mold assembly 3 close to 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 initially clamped with the first gear disc 14, 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 inside of the top end second tooth block 17, the fifth circular rod 20 is fixedly connected to the side of the top end second tooth block 17 away from the fourth circular rod 18, the surface of the rotating disc 801 is provided with the third arc-shaped groove 802 matched with the fifth circular rod 20, the fifth circular rod 20 is movably clamped in the inside of the third arc-shaped groove 802, the third arc-shaped groove 802 and the fourth arc-shaped groove 803 are in the same direction, the second tooth block 17 is initially clamped with the second gear disc 16, 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 conical.

[0033] By adopting the above scheme: the inside of the nozzle assembly 4 is conical, which has the effect that the conical shape makes the inside of the nozzle assembly 4 gradually transition from a larger caliber connected with the injection assembly 2 to a smaller caliber of the discharge port, and this shape can guide the plastic melt to flow more smoothly from the nozzle assembly 4 to the discharge port, reduce the flow resistance, and the plastic can flow in a more orderly manner under the guidance of the conical inner wall, avoiding turbulence or blockage.

[0034] The working principle and use process of the present application are as follows: when it is necessary to clean the inside of the nozzle assembly 4, the operator rotates the threaded rod 19 to drive the second tooth block 17 at the bottom end thereof to move away from the second gear disc 16, the second tooth block 17 moves while driving the fourth circular rod 18 thereon to move in the same direction, so that the fourth circular rod 18 slides along the track of the first arc-shaped groove 502, thereby driving the rotating drum 501 to rotate, the rotating drum 501 rotates while driving the first circular rod 7 to slide along the track of the second arc-shaped groove 503, when the fourth circular rod 18 abuts against the inner wall of the first arc-shaped groove 502, the first circular rod 7 drives the limiting block 6 to shrink into the inside of the nozzle assembly 4 through the second arc-shaped groove 503, so that the limiting block 6 is disengaged from the injection assembly 2;

[0035] When the threaded rod 19 drives the top end second tooth block 17 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-shaped slot 802, and then the fifth round rod 20 and the third arc-shaped slot 802 are matched to rotate the rotating disc 801, and the rotating disc 801 rotates to drive the third round rod 13 to slide along the track of the fourth arc-shaped slot 803, so that the second round rod 12 and the first tooth block 11 at one end thereof are driven by the third round rod 13 to move away from the first gear disc 14, when the third round rod 13 abuts against the inner wall of the fourth arc-shaped slot 803, the first tooth block 11 is completely retracted into the sleeve 9, and the first tooth block 11 is disengaged from the first gear disc 14, then the operator presses the sleeve 9 to drive the first tooth block 11 to move into the nozzle assembly 4, when the sleeve 9 is completely retracted into the nozzle assembly 4, the sleeve 9 is disengaged from the shielding position of the connecting position of the mold assembly 3 and the nozzle assembly 4, so that the operator can take out the nozzle assembly 4 from the injection assembly 2, and then the inside of the nozzle assembly 4 is convenient for cleaning and maintenance.

[0036] When the rotating drum 501 rotates, the five fourth round rods 18 are driven to slide along the tracks of the five first arc-shaped slots 502, and then the fourth round rods 18 drive the other four second tooth blocks 17 to move away from the second gear disc 16, when the five second tooth blocks 17 are retracted into the nozzle assembly 4, the second gear disc 16 is disengaged from the nozzle assembly 4, so that the filter screen plate 15 is convenient for being taken out from the nozzle assembly 4, and then the filter screen plate 15 is convenient for being replaced and disassembled.

[0037] It should be noted that the relational terms herein such as first and second and the like are used only to differentiate one entity or operation from another, and do not necessarily require or imply that any such actual relationship or order exists between or among the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations of the embodiments can be made without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An injection molding apparatus for HDPE plastic pipe processing, comprising a base (1), characterized in that: The top of the base (1) is provided with an injection assembly (2) and a mold closing assembly (3), one end of the injection assembly (2) is clamped with a nozzle assembly (4) close to the mold closing assembly (3), the inside of the nozzle assembly (4) is movably connected with a first rotating assembly (5) and a second rotating assembly (8), the inside of the nozzle assembly (4) is movably connected with a limiting block (6) at intervals of 90 degrees, one side of the limiting block (6) close to the first rotating assembly (5) is fixedly connected with a first circular rod (7), one end of the nozzle assembly (4) is movably connected with a sleeve (9) close to the mold closing assembly (3), the inside of one end of the nozzle assembly (4) close to the sleeve (9) is provided with a first tooth block (11) at intervals of 90 degrees, one side of the first tooth block (11) close to the second rotating assembly (8) is fixedly connected with a second circular rod (12), the outside of the second circular rod (12) is movably sleeved with a third circular rod (13), the inside of the nozzle assembly (4) is clamped with a filter screen plate (15), the outside of the filter screen plate (15) is provided with a second gear disc (16), the inside of the nozzle assembly (4) is provided with a second tooth block (17) at intervals of 72 degrees, one side of the second tooth block (17) close to the first rotating assembly (5) is provided with a fourth circular rod (18), the top of the nozzle assembly (4) is threadedly connected with a threaded rod (19); The first rotating assembly (5) comprises a rotating cylinder (501), the rotating cylinder (501) is provided with a first arc-shaped groove (502) at intervals of 72 degrees on one side of the second gear disc (16), the fourth circular rod (18) is movably clamped in the first arc-shaped groove (502), and the outer wall of the rotating cylinder (501) is provided with a second arc-shaped groove (503) at intervals of 90 degrees; The first circular rod (7) is movably clamped in the second arc-shaped groove (503), the limiting block (6) penetrates through the outer wall of the nozzle assembly (4) and extends to the outside of the nozzle assembly (4), and the limiting block (6) is clamped in the inside of the injection assembly (2) in the initial state; The second rotating assembly (8) comprises a rotating disc (801), and the surface of the rotating disc (801) is provided with a fourth arc-shaped groove (803) at intervals of 90 degrees, and one end of the third circular rod (13) away from the second circular rod (12) is movably clamped in the fourth arc-shaped groove (803); The mold closing assembly (3) is fixedly connected with a first gear disc (14) outside one end close to the nozzle assembly (4), the first tooth block (11) penetrates through the outer wall of the sleeve (9) and extends to the outside of the sleeve (9), and the first tooth block (11) is clamped with the first gear disc (14) in the initial state; The bottom end of the threaded rod (19) is movably clamped in the inside of the top second tooth block (17), and one side of the top second tooth block (17) away from the fourth circular rod (18) is fixedly connected with a fifth circular rod (20). The surface of the rotating disc (801) is provided with a third arc-shaped groove (802) matched with a fifth round rod (20), the fifth round rod (20) is movably connected in the third arc-shaped groove (802), the third arc-shaped groove (802) and the fourth arc-shaped groove (803) are in the same direction, and the second tooth block (17) is connected with the second gear disc (16) in the initial state.

2. The injection molding apparatus for HDPE plastic pipe processing according to claim 1, characterized in that: The inner wall of the nozzle assembly (4) is provided with a straight slot matched with a third round rod (13), and the straight slot is used for limiting the third round rod (13) in the circumferential direction when the rotating disc (801) rotates.

3. The injection molding apparatus for HDPE plastic pipe processing according to claim 1, characterized in that: The sleeve (9) penetrates through the outer wall of the nozzle assembly (4) and extends to the outside of the nozzle assembly (4), the side, away from the mold closing assembly (3), of the sleeve (9) is fixedly connected with a spring (10), the spring (10) is fixedly connected to the nozzle assembly (4), and the spring (10) is used for pressing the sleeve (9) and making the sleeve (9) keep moving towards the mold closing assembly (3).

4. The injection molding apparatus for HDPE plastic pipe processing according to claim 1, characterized in that: The top end of the threaded rod (19) penetrates through the outer wall of the nozzle assembly (4) and extends to the outside of the nozzle assembly (4).

5. The injection molding apparatus for HDPE plastic pipe processing of claim 1, wherein: 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 conical shape.

6. A method for injection molding of HDPE plastic pipe, applied to the injection molding equipment for HDPE plastic pipe of any one of claims 1-5, 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 the two sides of the second tooth block (17) are driven to move away from the second gear disc (16), so that the fourth round rod (18) slides along the track of the first arc-shaped groove (502), and the rotating drum (501) rotates, after the rotating drum (501) rotates, the first round rod (7) slides along the track of the second arc-shaped groove (503), so that the limiting block (6) is retracted into the nozzle assembly (4) and is disconnected with the injection assembly (2); S2, the fifth round rod (20) slides along the track of the third arc-shaped groove (802) while moving, so that the rotating disc (801) rotates, and then drives the third round rod (13) to move along the track of the fourth arc-shaped groove (803), the first tooth block (11) is driven by the second round rod (12) to move in the same direction when the third round rod (13) moves, so that the first tooth block (11) is disconnected with the first gear disc (14); S3, when the rotating drum (501) rotates, a plurality of fourth round rods (18) slide along the corresponding first arc-shaped grooves (502) respectively, so that the five second tooth blocks (17) are retracted into the nozzle assembly (4), and then the second tooth block (17) is disconnected with the second gear disc (16), so that the filter screen plate (15) is conveniently taken out from the inside of the nozzle assembly (4) for replacement.

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