A corrosion-resistant axial flow pump rear cover plastic molding equipment

Abstract

The invention relates to the technical field of plastic molding, and in particular to a back cover plastic molding device for a corrosion-resistant axial flow pump, comprising a bottom plate and an extruder; and also comprising an injection molding pipe, an air pipe, a lower mold, a lower air delivery net pipe, an upper mold, a feeding pipe, an upper air delivery net pipe and a lifting mechanism, wherein the extrusion pipe of the extruder is connected with the injection molding pipe, the air pipe is sleeved on the outer wall of the injection molding pipe, the lower mold is installed on the lifting mechanism, a lower air delivery net pipe is arranged inside the lower mold, and a lower air outlet structure is arranged on the surface of a lower cavity of the lower air delivery net pipe, the upper mold is sleeved on the outer wall of the air pipe, an annular molding table is arranged in the middle of the upper cavity, the annular molding table is arranged with a plurality of injection molding holes, the injection molding holes are connected with the inside of the injection molding pipe after passing through the air pipe through a plurality of feeding pipes, an upper air delivery net pipe is arranged inside the upper mold, and an upper air delivery net pipe is arranged on the surface of the upper cavity; the plastic back cover is blown off by high-pressure air to avoid sticking, and the plastic back cover is quickly blown to cool and harden, thereby improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of plastic molding, in particular to a back cover plastic molding device for a corrosion-resistant axial flow pump. Background Art

[0002] The working principle of the corrosion-resistant axial flow pump is to use the thrust of the rotating impeller blades to make the transported liquid flow along the pump shaft direction. When the pump shaft is driven by the motor to rotate, due to the certain helical angle between the blades and the pump shaft axis, thrust (or lift) is generated on the liquid, pushing the liquid out and discharging it along the discharge pipe.

[0003] The plastic sealed rear cover of the corrosion-resistant axial flow pump is molded by a plastic molding device. A variety of plastic molding devices are disclosed in the prior art. For example, a plastic injection molding device proposed in a Chinese invention patent application with publication number CN119078133A includes a cylinder body, a fixed mold fixedly sealed and connected to one end of the cylinder body, and a movable mold sealed and matched with the fixed mold. An injection port is opened on the fixed mold, and a sliding part is provided in the elastic dynamic seal in the cylinder body. A plug adapted to the injection port is fixedly provided at the bottom of the sliding part, and the plug is staggered with the injection port in the initial state; a partition is fixedly provided in the cylinder body to divide the inner cavity of the cylinder body into a material cavity and a connecting cavity, a feed port is opened on the partition, and an exhaust hole is opened in the cylinder body, and the feed port and the exhaust hole are both connected to the connecting cavity The two molds are connected, and a sealing member for sealing the exhaust hole is arranged in the connecting cavity; during the injection process, the pressure in the mold cavity can still be ensured to be continuously increased to improve the molding effect of the mold, while the molded part in the mold cavity is separated from the plastic in the injection port so that the molded part will not adhere to the solidified plastic in the injection port when it is unloaded after cooling; when the injection molding equipment makes the plug seal and fit the inner wall of the injection port, the bottom surface of the plug and the top surface of the mold cavity are located in the same horizontal plane and seamlessly abut, so that the top surface of the molten plastic in the mold cavity is a complete plane at this time, so that when the molten plastic in the mold cavity is cooled and solidified to form a molded part, the surface of the molded part is smooth and no excess solidified plastic will adhere to it, thereby eliminating the subsequent process of removing excess solidified plastic.

[0004] However, the fixed mold and the movable mold of the above-mentioned molding equipment do not have demoulding and cooling structures, resulting in a long time for the plastic to be molded in the molding chamber between the fixed mold and the movable mold, and the molded back cover is easy to stick to the inner wall of the molding chamber, resulting in inconvenience in unloading. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a back cover plastic molding device of a corrosion-resistant axial flow pump, which can blow off the plastic back cover with high-pressure air to avoid sticking, and quickly blow the plastic back cover to cool and harden it, thereby improving work efficiency.

[0006] The invention discloses a plastic molding device for a back cover of a corrosion-resistant axial flow pump, comprising a base plate and an extruder, wherein the extruder is mounted on the base plate through a bracket; the device also comprises an injection molding tube, an air pipe, a lower mold, a lower air delivery mesh tube, an upper mold, a feeding pipe, an upper air delivery mesh tube and a lifting mechanism, wherein the extrusion tube of the extruder is vertically downward and connected to the input end of the injection molding tube, the air pipe is sleeved on the outer wall of the injection molding tube, an air channel is arranged between the air pipe and the injection molding tube, the lifting mechanism is mounted on the base plate, the lower mold is mounted on the lifting mechanism, a lower cavity is arranged on the upper end surface of the lower mold, a through hole matching the air pipe is arranged in the middle of the lower cavity, and the lower mold has a plurality of holes. A lower air supply mesh tube is arranged inside, and a lower air outlet structure is arranged on the surface of the lower cavity of the lower air supply mesh tube. An air inlet hole is arranged on the inner wall of the middle through hole of the lower mold, and the air inlet hole is matched and aligned with the air outlet hole at the lower end of the air pipe. The upper mold is sleeved on the outer wall of the air pipe, and an upper mold cavity is arranged on the lower end surface of the upper mold. An annular molding table is arranged in the middle of the upper mold cavity, and a plurality of injection holes are arranged on the annular molding table. The injection holes are connected with the inside of the injection molding tube after passing through the air pipe through a plurality of feeding pipes. An upper air supply mesh tube is arranged inside the upper mold, and an upper air outlet structure is arranged on the surface of the upper cavity of the upper air supply mesh tube. The input end is connected with the air channel between the air pipe and the injection molding tube; when working, the lifting mechanism drives the lower mold to rise, so that the lower mold and the upper mold are aligned and pressed tightly, and the lower cavity of the lower mold and the upper cavity of the upper mold are buckled to form a molding cavity. At this time, the lower end of the air pipe is inserted into the through hole of the lower mold, and the extruder injects the melted plastic into the molding cavity through the injection molding tube and the injection hole of the upper mold until the plastic fills the molding cavity and stops injecting. When the plastic is semi-hardened, the lifting mechanism drives the lower mold to descend, so that the lower mold and the upper mold are separated and a gap of about 5 mm is generated, and the air outlet of the air pipe is aligned with the inlet of the lower air delivery network pipe. The air holes remain butt-jointed, and external high-pressure air or cold air is input into the air pipe and transported to the upper and lower air supply net pipes along the air channel. The high-pressure air is input into the upper mold through the upper air supply net pipe and ejected through the upper air outlet structure. At the same time, the high-pressure air is input into the lower mold through the lower air supply net pipe and ejected through the lower air outlet structure. The ejected high-pressure air can blow the plastic back cover off the lower mold or the upper mold to avoid the inconvenience of unloading caused by sticking. At the same time, the highly flowing air or cold air quickly cools and hardens the plastic back cover, shortens the time for the plastic back cover to be finalized, and improves work efficiency.

[0007] Preferably, the lower air outlet structure includes multiple lower springs, a lower push frame and multiple lower air injection holes. The lower air supply network pipe is provided with a groove one on the upper surface of the lower cavity of the lower mold. Multiple lower springs are installed in the groove one. The lower push frame is slidably installed in the groove one. The elastic force of the multiple lower springs makes the upper end surface of the lower push frame flush with the upper surface of the lower cavity of the lower mold. The side wall of the lower push frame is provided with multiple lower air injection holes. The multiple lower air injection holes are evenly connected to the lower air supply network pipe. In the injection molding stage and the semi-hardening stage of the plastic back cover, the lower push frame and the lower cavity of the lower mold are connected. The upper surface of the plastic back cover is flush, thereby making the surface of the plastic back cover flat. After the plastic back cover is semi-hardened, high-pressure air is input into the groove 1 of the lower air supply network pipe through the air outlet of the air pipe, and the air pressure pushes the lower push frame out of the groove 1, so that the lower push frame pushes the plastic back cover up and separates it from the lower mold to avoid sticking. At the same time, high-pressure air is sprayed out through multiple lower air jet holes to blow and cool the lower part of the plastic back cover. After the cooling is completed, the high-pressure air stops, and the elastic force of multiple lower springs pulls the lower push frame back to the groove 1 to reset, which has good practicality.

[0008] Preferably, the upper air outlet structure includes a plurality of upper springs, an upper push frame and a plurality of upper air injection holes. The upper air delivery network pipe is provided with a groove 2 on the lower surface of the upper cavity of the upper mold. The plurality of upper springs are installed in the groove 2. The upper push frame is slidably installed in the groove 2. The elastic force of the plurality of upper springs makes the lower end surface of the upper push frame flush with the lower surface of the upper cavity of the upper mold. The side wall of the upper push frame is provided with a plurality of upper air injection holes. The plurality of upper air injection holes are evenly connected to the upper air delivery network pipe. In the injection molding stage and the semi-hardening stage of the plastic back cover, the upper push frame is in contact with the lower surface of the upper cavity of the upper mold. The upper push frame is pushed out of the groove 2 by the air pressure, so that the upper push frame pushes the plastic back cover downward and separates it from the upper mold to avoid sticking. At the same time, high-pressure air is ejected through multiple upper air jet holes to cool the upper part of the plastic back cover. After the cooling is completed, the high-pressure air stops, and the elastic force of multiple upper springs pulls the upper push frame back to the groove 1 for reset, which has good practicality.

[0009] Preferably, it also includes multiple clamping plates and multiple spring plates, the inner ends of the multiple clamping plates are rotatably connected to the inner wall of the trachea through a rotating shaft, the trachea is provided with openings matching the outer ends of the multiple clamping plates, one end of the multiple spring plates is connected to the clamping plates, and the other end of the spring plates is connected to the outer wall of the injection molding tube, and the elastic force of the multiple spring plates pushes the outer ends of the multiple clamping plates to the outside of the trachea; during the descending process of the lower mold, when the outer ends of the multiple clamping plates are disengaged from the through holes of the lower mold, the multiple spring plates push the outer ends of the multiple clamping plates out of the multiple openings of the trachea, so that the outer ends of the multiple clamping plates press against the mounting hole wall in the middle of the plastic back cover, thereby clamping the plastic back cover and removing it from the lower mold, which is convenient for material removal.

[0010] Preferably, the lifting mechanism includes a column, a slide, a servo motor and a screw. The column is vertically mounted on the base plate, the slide is slidably mounted on the column, the lower mold is mounted on the slide, and the servo motor is mounted on the base plate. The output shaft of the servo motor is concentrically connected to the screw, and the screw is connected to the slide through a screw nut. The servo motor drives the screw to rotate, and the screw drives the slide to rise and fall along the column under the action of the screw nut, so that the slide drives the lower mold to rise and fall. The technology is mature and reliable.

[0011] Preferably, it also includes a bearing seat, which is concentrically arranged with the column, one end of the bearing seat is connected to the slide seat, and the other end of the bearing seat is connected to the screw transmission through a screw nut; the slide seat is rotatably installed on the bearing seat, and the bearing seat drives the slide seat to rise and fall along the column, so that the slide seat can drive the lower mold to rise and fall and rotate, so that the lower mold is separated from the upper mold and transferred to the outside world, avoiding the lower mold blocking the unloading of the plastic back cover, thereby improving the unloading efficiency.

[0012] Preferably, it also includes a slide rail groove and a track wheel. The slide rail groove is arranged on the outer wall of the column, the upper end of the slide rail groove is a vertical part, the lower section of the slide rail groove is a rotating part, the track wheel is rotatably installed on the slide seat, and the track wheel rolls along the slide rail groove; when the slide seat is lifted or lowered, the track wheel is driven to roll in the slide rail groove, when the track wheel rolls along the vertical part of the slide rail groove, the slide seat drives the lower mold to lift or lower vertically, and when the track wheel rolls along the rotating part of the slide rail groove, the slide seat drives the lower mold to rotate and deflect during the descent, thereby transferring the lower mold to the outside of the upper mold, preventing the lower mold from blocking the plastic back cover of the material being unloaded.

[0013] Preferably, it also includes a mounting plate and mounting bolts, the mounting plate is mounted on the slide seat, and the lower mold is mounted on the mounting plate via the mounting bolts.

[0014] Preferably, it also includes a screw and a lever, the screw is installed on the slide seat through a small bracket, the screw is located on the outside of the mounting plate, the lever is horizontally installed on the screw, the lever is located on the rear side of the rotation direction of the mounting plate, and the lever is located above the lower mold; when the track wheel rolls along the rotating part of the slide rail groove, the screw drives the lever to rotate to the bottom of the upper mold, and the outer end of the lever extends to the top of the plastic back cover, and the track wheel continues to roll along the rotating part of the slide rail groove, so that the lever pushes the plastic back cover clamped on the air pipe down, thereby realizing automatic unloading and improving work efficiency.

[0015] Preferably, it also includes a support rod and a hydraulic push rod, the outer end of the support rod is rotatably connected to the bracket of the extruder, the lower end of the hydraulic push rod is rotatably connected to the bottom plate, and the upper end of the hydraulic push rod is rotatably connected to the support rod. When the support rod is rotated to horizontal, it supports the lower mold; when injection molding is performed, the hydraulic push rod extends to push the support rod to horizontal, so that the support rod supports the lower mold, making injection molding in the molding chamber between the upper mold and the lower mold more stable, thereby improving the injection molding quality.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: when working, the lifting mechanism drives the lower mold to rise, so that the lower mold is aligned and pressed with the upper mold, and the lower cavity of the lower mold and the upper cavity of the upper mold are buckled to form a molding cavity. At this time, the lower end of the air pipe is inserted into the through hole of the lower mold, and the extruder injects the melted plastic into the molding cavity through the injection tube and the injection hole of the upper mold until the plastic fills the molding cavity and stops injecting. When the plastic is semi-hardened, the lifting mechanism drives the lower mold to descend, so that the lower mold and the upper mold are separated and a gap of about 5 mm is generated, and the air outlet of the air pipe is aligned with the air inlet of the lower air delivery network pipe. The holes remain butt-jointed, and external high-pressure air or cold air is input into the air pipe and transported to the upper and lower air supply net pipes along the air channel. The high-pressure air is input into the upper mold through the upper air supply net pipe and ejected through the upper air outlet structure. At the same time, the high-pressure air is input into the lower mold through the lower air supply net pipe and ejected through the lower air outlet structure. The ejected high-pressure air can blow the plastic back cover off the lower mold or the upper mold to avoid the inconvenience of unloading caused by sticking. At the same time, the highly flowing air or cold air quickly cools down and hardens the plastic back cover, shortens the time for the plastic back cover to be finalized, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a front structural schematic diagram of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the lower mold of the present invention in a descending state;

[0020] Figure 4 It is a structural schematic diagram of the lower mold transfer state of the present invention;

[0021] Figure 5 It is a structural schematic diagram of the injection molding pipe, air pipe, lower mold, lower air delivery network pipe and upper mold;

[0022] Figure 6 It is a schematic diagram of the front cross-section structure in the injection molding state when the lower mold and the upper mold are buckled together;

[0023] Figure 7 It is a schematic diagram of the front cross-section structure when the lower mold and the upper mold are in the demoulding state;

[0024] Figure 8 It is a structural schematic diagram of the exploded state of the lower mold, the lower air supply network pipe, the lower spring and the lower push frame;

[0025] Fig. 9 It is a schematic diagram of the structure of the upper die, the feeding pipe, the upper air feeding net pipe, the upper spring, the upper push frame and the upper air injection hole in the exploded state;

[0026] Fig.10It is a schematic diagram of the structure of the injection molding tube, air pipe, feeding tube, clamping sheet and spring sheet;

[0027] Fig.11 It is a schematic diagram of the structure of the injection tube, air pipe, feed tube, clamping sheet and spring sheet in the exploded state;

[0028] Fig.12 It is a structural diagram of the base plate and the lifting mechanism.

[0029] Markings in the attached figure: 1, bottom plate; 2, extruder; 3, injection tube; 4, air pipe; 5, lower mold; 6, lower air supply mesh tube; 7, upper mold; 8, feed pipe; 9, upper air supply mesh tube; 10, lower spring; 11, lower push frame; 12, lower air jet hole; 13, upper spring; 14, upper push frame; 15, upper air jet hole; 16, clamping plate; 17, spring plate; 18, column; 19, slide seat; 20, servo motor; 21, lead screw; 22, bearing seat; 23, slide rail groove; 24, track wheel; 25, screw; 26, lever; 27, support rod; 28, hydraulic push rod; 29, mounting plate; 30, mounting bolts. DETAILED DESCRIPTION

[0030] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0031] like Figures 1 to 4 , Fig.10 and Fig.11As shown, a corrosion-resistant axial flow pump rear cover plastic molding equipment includes a base plate 1 and an extruder 2, and the extruder 2 is installed on the base plate 1 through a bracket; it also includes an injection tube 3, an air pipe 4, a lower mold 5, a lower air delivery network tube 6, an upper mold 7, a feeding pipe 8, an upper air delivery network tube 9 and a lifting mechanism. The extrusion tube of the extruder 2 is vertically downward and connected to the input end of the injection tube 3, the air pipe 4 is sleeved on the outer wall of the injection tube 3, and an air channel is set between the air pipe 4 and the injection tube 3. The lifting mechanism is installed on the base plate 1, and the lower mold 5 is installed. It is mounted on the lifting mechanism, the upper end surface of the lower mold 5 is provided with a lower cavity, the middle part of the lower cavity is provided with a through hole matching the air pipe 4, the lower air supply mesh tube 6 is provided inside the lower mold 5, the lower air supply mesh tube 6 is provided with a lower air outlet structure on the surface of the lower cavity, the lower air supply mesh tube 6 is provided with an air inlet hole on the inner wall of the through hole in the middle of the lower mold 5, the air inlet hole is matched and aligned with the air outlet hole at the lower end of the air pipe 4, the upper mold 7 is sleeved on the outer wall of the air pipe 4, the lower end surface of the upper mold 7 is provided with an upper cavity, and the middle part of the upper cavity is provided with an annular forming table, the annular forming table A plurality of injection holes are provided, and the injection holes are connected with the interior of the injection tube 3 after passing through the air tube 4 through a plurality of feeding tubes 8; an upper air delivery mesh tube 9 is provided inside the upper mold 7, and an upper air outlet structure is provided on the surface of the upper cavity; the input end of the upper air delivery mesh tube 9 is connected with the air channel between the air tube 4 and the injection tube 3; and a plurality of clamping sheets 16 and a plurality of spring sheets 17 are also provided, the inner ends of the plurality of clamping sheets 16 are rotatably connected with the inner wall of the air tube 4 through a rotating shaft, and the air tube 4 is provided with a plurality of clamping sheets 16 at the outer ends thereof. Matching openings, one end of the multiple spring sheets 17 is connected to the clamping sheet 16, and the other end of the spring sheet 17 is connected to the outer wall of the injection molding tube 3. The elastic force of the multiple spring sheets 17 pushes the outer ends of the multiple clamping sheets 16 to the outside of the air pipe 4; it also includes a support rod 27 and a hydraulic push rod 28, the outer end of the support rod 27 is rotatably connected to the bracket of the extruder 2, the lower end of the hydraulic push rod 28 is rotatably connected to the bottom plate 1, and the upper end of the hydraulic push rod 28 is rotatably connected to the support rod 27. When the support rod 27 rotates to a horizontal position, it supports the lower mold 5.

[0032] During operation, the lifting mechanism drives the lower mold 5 to rise, so that the lower mold 5 is aligned and pressed with the upper mold 7, and the lower cavity of the lower mold 5 and the upper cavity of the upper mold 7 are buckled to form a molding cavity. At this time, the lower end of the air pipe 4 is inserted into the through hole of the lower mold 5, and the hydraulic push rod 28 is extended to push the support rod 27 to a horizontal level, so that the support rod 27 supports the lower mold 5, so that the injection molding in the molding cavity between the upper mold 7 and the lower mold 5 is more stable, and the extruder 2 injects the molten plastic into the molding cavity through the injection tube 3 and the injection hole of the upper mold 7, and stops injecting after the plastic fills the molding cavity. When the plastic is semi-hardened, the lifting mechanism drives the lower mold 5 to descend, so that the lower mold 5 and the upper mold 7 are separated and a gap of about 5 mm is generated, and the air outlet of the air pipe 4 is kept connected with the air inlet of the lower air delivery network pipe 6, and the external high-pressure air or cold air is input into the air pipe 4 and sent upward along the air channel. The air is transported by the air mesh tube 9 and the lower air delivery mesh tube 6. The high-pressure air is input into the upper mold 7 through the upper air delivery mesh tube 9 and ejected through the upper air outlet structure. At the same time, the high-pressure air is input into the lower mold 5 through the lower air delivery mesh tube 6 and ejected through the lower air outlet structure. The ejected high-pressure air can blow the plastic back cover off the lower mold 5 or the upper mold 7 to avoid the inconvenience of unloading caused by sticking. At the same time, the highly flowing air or cold air quickly cools and hardens the plastic back cover, shortens the time for the plastic back cover to be shaped, and improves work efficiency. After the plastic back cover is shaped, the lower mold 5 descends. When the outer ends of the multiple clamping pieces 16 are separated from the through holes of the lower mold 5, the multiple spring pieces 17 push the outer ends of the multiple clamping pieces 16 out of the multiple openings of the air pipe 4, so that the outer ends of the multiple clamping pieces 16 are pressed against the mounting hole wall in the middle of the plastic back cover, thereby clamping the plastic back cover and taking it out from the lower mold 5, which is convenient for unloading.

[0033] like Figures 5 to 9 As shown, on the basis of Example 1, the lower air outlet structure includes a plurality of lower springs 10, a lower push frame 11 and a plurality of lower air injection holes 12, the lower air delivery network tube 6 is provided with a groove 1 on the upper surface of the lower cavity of the lower mold 5, a plurality of lower springs 10 are installed in the groove 1, the lower push frame 11 is slidably installed in the groove 1, the elastic force of the plurality of lower springs 10 makes the upper end surface of the lower push frame 11 flush with the upper surface of the lower cavity of the lower mold 5, the side wall of the lower push frame 11 is provided with a plurality of lower air injection holes 12, and the plurality of lower air injection holes 12 are evenly connected to the lower delivery network tube 6. The air network tube 6 is connected; the upper air outlet structure includes multiple upper springs 13, an upper push frame 14 and multiple upper jet holes 15. The upper air supply network tube 9 is provided with groove 2 on the lower surface of the upper cavity of the upper mold 7. Multiple upper springs 13 are installed in groove 2. The upper push frame 14 is slidably installed in groove 2. The elastic force of the multiple upper springs 13 makes the lower end surface of the upper push frame 14 flush with the lower surface of the upper cavity of the upper mold 7. The side wall of the upper push frame 14 is provided with multiple upper jet holes 15, and the multiple upper jet holes 15 are evenly connected to the upper air supply network tube 9.

[0034] During the injection molding stage and the semi-hardening stage of the plastic back cover, the lower push frame 11 is flush with the upper surface of the lower cavity of the lower mold 5, so that the surface of the plastic back cover is flat. After the plastic back cover is semi-hardened, high-pressure air is input into the groove 1 of the lower air supply network tube 6 through the air outlet of the air pipe 4. The air pressure pushes the lower push frame 11 out of the groove 1, so that the lower push frame 11 pushes the plastic back cover up and separates it from the lower mold 5 to avoid sticking. At the same time, high-pressure air is ejected through multiple lower jet holes 12 to blow and cool the lower part of the plastic back cover. After the cooling is completed, the high-pressure air stops, and the elastic force of multiple lower springs 10 pulls the lower push frame 11 back to the groove 1 to reset it. In the semi-hardening stage and the plastic back cover, the upper push frame 14 is flush with the lower surface of the upper cavity of the upper mold 7, so that the surface of the plastic back cover is flat. After the plastic back cover is semi-hardened, high-pressure air is input into the groove two of the upper mold 7 through the air channel between the air pipe 4 and the injection molding tube 3. The air pressure pushes the upper push frame 14 out of the groove two, so that the upper push frame 14 pushes the plastic back cover downward to separate from the upper mold 7 to avoid sticking. At the same time, high-pressure air is ejected through multiple upper jet holes 15 to blow and cool the upper part of the plastic back cover. After cooling, the high-pressure air stops, and the elastic force of multiple upper springs 13 pulls the upper push frame 14 back to the groove one for reset.

[0035] like Figures 1 to 4 and Fig.12 As shown, on the basis of Example 1, the lifting mechanism includes a column 18, a slide 19, a servo motor 20 and a screw 21, the column 18 is vertically installed on the base plate 1, the slide 19 is slidably sleeved on the column 18, the lower mold 5 is installed on the slide 19, the servo motor 20 is installed on the base plate 1, the output shaft of the servo motor 20 is concentrically connected to the screw 21, and the screw 21 is connected to the slide 19 through a screw nut; it also includes a bearing seat 22, the bearing seat 22 is concentrically arranged with the column 18, one end of the bearing seat 22 is connected to the slide 19, and the other end of the bearing seat 22 is connected to the screw 21 through a screw nut; it also includes a slide rail groove 23 and a track wheel 24 ... A slide rail groove 23 is set on the outer wall of the column 18, the upper end of the slide rail groove 23 is a vertical part, the lower section of the slide rail groove 23 is a rotating part, the track wheel 24 is rotatably installed on the slide seat 19, and the track wheel 24 rolls along the slide rail groove 23; it also includes a mounting plate 29 and a mounting bolt 30, the mounting plate 29 is installed on the slide seat 19, and the lower mold 5 is installed on the mounting plate 29 through the mounting bolt 30; it also includes a screw rod 25 and a lever 26, the screw rod 25 is installed on the slide seat 19 through a small bracket, the screw rod 25 is located on the outer side of the mounting plate 29, the lever 26 is horizontally installed on the screw rod 25, the lever 26 is located on the rear side of the rotation direction of the mounting plate 29, and the lever 26 is located above the lower mold 5.

[0036] The servo motor 20 drives the screw rod 21 to rotate. The screw rod 21 drives the bearing seat 22 to rise and fall along the column 18 under the action of the screw nut. The bearing seat 22 drives the slide seat 19 to rise and fall along the column 18, so that the slide seat 19 can drive the lower mold 5 to rise and fall and rotate. When the slide seat 19 rises and falls, it drives the track wheel 24 to roll in the slide rail groove 23. When the track wheel 24 rolls along the vertical part of the slide rail groove 23, the slide seat 19 drives the lower mold 5 to rise and fall vertically. When the track wheel 24 rolls along the rotating part of the slide rail groove 23, the slide seat 19 The lower mold 5 is driven to rotate and deflect during the descent process, thereby transferring the lower mold 5 to the outside of the upper mold 7 to prevent the lower mold 5 from blocking the plastic back cover of the unloading. When the track wheel 24 rolls along the rotating part of the slide rail groove 23, the screw 25 drives the lever 26 to rotate to the bottom of the upper mold 7, and the outer end of the lever 26 extends to the top of the plastic back cover. The track wheel 24 continues to roll along the rotating part of the slide rail groove 23, so that the lever 26 pushes the plastic back cover clamped on the air pipe 4 down, realizing automatic unloading and improving unloading efficiency.

[0037] like Figures 1 to 12As shown, a corrosion-resistant axial flow pump rear cover plastic molding device of the present invention, when working, firstly, the slide 19 is raised along the column 18 to drive the lower mold 5 to be raised, so that the lower mold 5 is aligned and pressed with the upper mold 7, and the lower cavity of the lower mold 5 and the upper cavity of the upper mold 7 are buckled to form a molding cavity. At this time, the lower end of the air pipe 4 is inserted into the through hole of the lower mold 5, and the extruder 2 injects the melted plastic into the molding cavity through the injection tube 3 and the injection hole of the upper mold 7, and stops injecting the melted plastic until the molding cavity is filled with the plastic. Then, when the plastic is semi-hardened, The servo motor 20 drives the screw rod 21 to rotate. The screw rod 21 drives the slide 19 and the lower mold 5 to descend along the column 18 under the action of the screw nut, so that the lower mold 5 and the upper mold 7 are separated and a gap of about 5 mm is generated, and the air outlet of the air pipe 4 is kept connected with the air inlet of the lower air supply network pipe 6. The external high-pressure air or cold air is input into the air pipe 4 and transported to the upper air supply network pipe 9 and the lower air supply network pipe 6 along the air channel. Then, the high-pressure air is input into the upper mold 7 through the upper air supply network pipe 9 and sprayed through the upper air outlet structure. At the same time, high-pressure air is input into the lower mold 5 through the lower air delivery network pipe 6 and ejected through the lower air outlet structure. The ejected high-pressure air can blow the plastic back cover off the lower mold 5 or the upper mold 7 to avoid the inconvenience of unloading caused by sticking. At the same time, the highly flowing air or cold air quickly cools and hardens the plastic back cover, shortening the time for the plastic back cover to be fixed. The slide seat 19 continues to descend along the column 18. When the outer ends of the plurality of clamping pieces 16 are separated from the through holes of the lower mold 5, the plurality of spring pieces 17 push the outer ends of the plurality of clamping pieces 16 out of the air. The multiple openings of the tube 4 allow the outer ends of the multiple clamping pieces 16 to press against the mounting hole wall in the middle of the plastic back cover, thereby clamping the plastic back cover and removing it from the lower mold 5. Finally, when the track wheel 24 rolls along the rotating portion of the slide rail groove 23, the screw 25 drives the lever 26 to rotate to the bottom of the upper mold 7, and the outer end of the lever 26 extends above the plastic back cover. The track wheel 24 continues to roll along the rotating portion of the slide rail groove 23, so that the lever 26 pushes the plastic back cover clamped on the air pipe 4 down, thereby realizing automatic unloading.

[0038] The main functions achieved by the present invention are:

[0039] 1. Use high-pressure air to blow off the plastic back cover to avoid sticking and improve material feeding efficiency;

[0040] 2. Use high-pressure air to quickly cool and harden the plastic back cover, shortening the shaping time of the plastic back cover and improving work efficiency;

[0041] 3. It can clamp the plastic back cover and automatically take it out for automatic unloading, thus improving work efficiency;

[0042] 4. The support structure makes the injection molding more stable and improves the quality of injection molding.

[0043] The installation method, connection method or setting method of the back cover plastic molding equipment of a corrosion-resistant axial flow pump of the present invention are all common mechanical methods, and can be implemented as long as they can achieve their beneficial effects; the extruder 2, injection tube 3, air pipe 4, lower mold 5, upper mold 7, feed tube 8, lower spring 10, upper spring 13, spring sheet 17, column 18, servo motor 20, screw 21, bearing seat 22, track wheel 24, screw 25, hydraulic push rod 28, and mounting bolts 30 of the back cover plastic molding equipment of a corrosion-resistant axial flow pump of the present invention are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for creative labor by technicians in this field.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A corrosion-resistant axial flow pump rear cover plastic molding device, comprising a base plate (1) and an extruder (2), wherein the extruder (2) is mounted on the base plate (1) via a bracket; characterized in that: The invention also comprises an injection molding tube (3), an air pipe (4), a lower mold (5), a lower air delivery net pipe (6), an upper mold (7), a feeding pipe (8), an upper air delivery net pipe (9) and a lifting mechanism. The extrusion tube of the extruder (2) is vertically downward and connected to the input end of the injection molding tube (3). The air pipe (4) is sleeved on the outer wall of the injection molding tube (3). An air passage is arranged between the air pipe (4) and the injection molding tube (3). The lifting mechanism is mounted on the bottom plate (1). The lower mold (5) is mounted on the lifting mechanism. A lower cavity is arranged on the upper end surface of the lower mold (5). A through hole matching the air pipe (4) is arranged in the middle of the lower cavity. A lower air delivery net pipe (6) is arranged inside the lower mold (5). The lower air delivery net pipe (6) is arranged on the surface of the lower cavity. An air outlet structure is provided, wherein an air inlet hole is arranged on the inner wall of the middle through hole of the lower mold (5), and the air inlet hole is matched and aligned with the air outlet hole at the lower end of the air pipe (4); the upper mold (7) is sleeved on the outer wall of the air pipe (4); an upper cavity is arranged on the lower end surface of the upper mold (7); an annular molding table is arranged in the middle of the upper cavity; the annular molding table is arranged with a plurality of injection holes; the injection holes are connected to the inside of the injection molding tube (3) after passing through the air pipe (4) through a plurality of feeding pipes (8); an upper air outlet structure is arranged on the surface of the upper cavity of the upper air supply network tube (9); and the input end of the upper air supply network tube (9) is connected to the air passage between the air pipe (4) and the injection molding tube (3).

2. The corrosion-resistant axial flow pump rear cover plastic molding device according to claim 1, characterized in that: The lower air outlet structure comprises a plurality of lower springs (10), a lower push frame (11) and a plurality of lower air injection holes (12); a groove is provided on the upper surface of the lower cavity of the lower mold (5) of the lower air supply network tube (6); a plurality of lower springs (10) are installed in the groove; the lower push frame (11) is slidably installed in the groove; the elastic force of the plurality of lower springs (10) makes the upper end surface of the lower push frame (11) flush with the upper surface of the lower cavity of the lower mold (5); a plurality of lower air injection holes (12) are provided on the side wall of the lower push frame (11); and the plurality of lower air injection holes (12) are evenly connected to the lower air supply network tube (6).

3. The corrosion-resistant axial flow pump rear cover plastic molding device according to claim 1, characterized in that: The upper air outlet structure comprises a plurality of upper springs (13), an upper push frame (14) and a plurality of upper air injection holes (15); the upper air delivery network tube (9) is provided with a second groove on the lower surface of the upper cavity of the upper mold (7); the plurality of upper springs (13) are installed in the second groove; the upper push frame (14) is slidably installed in the second groove; the elastic force of the plurality of upper springs (13) makes the lower end surface of the upper push frame (14) flush with the lower surface of the upper cavity of the upper mold (7); the side wall of the upper push frame (14) is provided with a plurality of upper air injection holes (15); and the plurality of upper air injection holes (15) are evenly connected to the upper air delivery network tube (9).

4. The corrosion-resistant axial flow pump rear cover plastic molding device according to claim 1, characterized in that: It also comprises a plurality of clamping sheets (16) and a plurality of spring sheets (17), wherein the inner ends of the plurality of clamping sheets (16) are rotatably connected to the inner wall of the air pipe (4) via a rotating shaft, an opening matching the outer ends of the plurality of clamping sheets (16) is provided on the air pipe (4), one end of the plurality of spring sheets (17) is connected to the clamping sheet (16), and the other end of the spring sheet (17) is connected to the outer wall of the injection molding tube (3), and the elastic force of the plurality of spring sheets (17) pushes the outer ends of the plurality of clamping sheets (16) toward the outside of the air pipe (4).

5. The corrosion-resistant axial flow pump rear cover plastic molding device according to claim 1, characterized in that: The lifting mechanism comprises a column (18), a slide (19), a servo motor (20) and a screw (21), wherein the column (18) is vertically mounted on a base plate (1), the slide (19) is slidably mounted on the column (18), the lower mold (5) is mounted on the slide (19), the servo motor (20) is mounted on the base plate (1), the output shaft of the servo motor (20) is coaxially connected to the screw (21), and the screw (21) is connected to the slide (19) via a screw nut.

6. The corrosion-resistant axial flow pump rear cover plastic molding device according to claim 5, characterized in that: It also includes a bearing seat (22), which is concentrically arranged with the column (18), one end of the bearing seat (22) is connected to the slide seat (19), and the other end of the bearing seat (22) is transmission-connected to the screw (21) via a screw nut.

7. The corrosion-resistant axial flow pump rear cover plastic molding device according to claim 6, characterized in that: It also includes a slide rail groove (23) and a track wheel (24). The slide rail groove (23) is arranged on the outer wall of the column (18). The upper end of the slide rail groove (23) is a vertical portion, and the lower section of the slide rail groove (23) is a rotating portion. The track wheel (24) is rotatably mounted on the slide seat (19), and the track wheel (24) rolls along the slide rail groove (23).

8. The corrosion-resistant axial flow pump rear cover plastic molding device according to claim 5, characterized in that: It also includes a mounting plate (29) and mounting bolts (30), wherein the mounting plate (29) is mounted on the slide seat (19), and the lower mold (5) is mounted on the mounting plate (29) via the mounting bolts (30).

9. The corrosion-resistant axial flow pump rear cover plastic molding device according to claim 7, characterized in that: The invention also comprises a screw rod (25) and a lever (26), wherein the screw rod (25) is mounted on the slide seat (19) through a small bracket, the screw rod (25) is located outside the mounting plate (29), the lever (26) is horizontally mounted on the screw rod (25), the lever (26) is located at the rear side of the mounting plate (29) in the rotation direction, and the lever (26) is located above the lower mold (5).

10. The corrosion-resistant axial flow pump rear cover plastic molding device according to claim 1, characterized in that: It also includes a support rod (27) and a hydraulic push rod (28), wherein the outer end of the support rod (27) is rotatably connected to the bracket of the extruder (2), the lower end of the hydraulic push rod (28) is rotatably connected to the bottom plate (1), and the upper end of the hydraulic push rod (28) is rotatably connected to the support rod (27). When the support rod (27) is rotated to a horizontal position, it supports the lower mold (5).

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