Closed die for PE pipe forming

Abstract

The utility model relates to the field of PE pipe forming, in particular to a closed die for PE pipe forming. The utility model aims to solve the technical problems that the diameter of the PE pipe is unstable and the overall quality and performance of the PE pipe are influenced due to the problems that the new extrusion-molded PE pipe is easy to deform, collapse and the like due to higher temperature and unstable material. When an extrusion die is replaced to produce PE pipes with other diameters, the inner diameter supporting device of the PE pipe needs to be replaced synchronously, so that the operation procedures and steps are increased, the downtime of equipment is prolonged, and the production flexibility is reduced. Comprising an outer die sleeve, a flow guide sleeve is slidably connected to the inner side face of the outer die sleeve, four flow dividing columns are fixedly connected to the side face of the flow guide sleeve, a die core is fixedly connected to the other ends of the four flow dividing columns, and an inner supporting mechanism is arranged at the other end of the die core. By arranging the inner supporting mechanism, the adjusting gear rotates to drive the four planetary gears to rotate, the planetary gears rotate to drive the sliding shaft to rotate, and the sliding shaft rotates to push the sliding seat to slide towards one side.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of PE pipe forming, especially to a closed mould for PE pipe forming. BACKGROUND

[0002] PE pipe is mainly made of high-density polyethylene (HDPE) or low-density polyethylene (LDPE) material, which endows PE pipe with the characteristics of light weight, corrosion resistance, easy installation, etc. Due to its excellent performance and wide applicability, PE pipe has been widely used and recognized in many fields. With the progress of science and technology and the improvement of people's requirements for environmental protection and energy saving, the application prospect of PE pipe will be more extensive. In the production process of PE pipe, extrusion molding is a crucial link.

[0003] Extrusion molding is to extrude the molten PE material through a mold to form a continuous tubular product. In the prior art, the newly extruded PE pipe is prone to deformation, collapse, etc. due to high temperature and unstable material, resulting in unstable diameter of the PE pipe and affecting the overall quality and performance of the PE pipe. When changing the extrusion mold to produce PE pipes of other diameter sizes, the inner diameter support device of the PE pipe needs to be changed synchronously, which increases the operation process and steps, prolongs the downtime of the equipment and reduces the production flexibility. SUMMARY

[0004] (1) Technical problem to be solved

[0005] The utility model discloses to overcome the newly extruded PE pipe due to high temperature and unstable material, prone to deformation, collapse, etc. resulting in unstable diameter of the PE pipe, affecting the overall quality and performance of the PE pipe. When changing the extrusion mold to produce PE pipes of other diameter sizes, the inner diameter support device of the PE pipe needs to be changed synchronously, which increases the operation process and steps, prolongs the downtime of the equipment and reduces the production flexibility. The technical problem to be solved by the utility model is to provide a closed mould for PE pipe forming.

[0006] (2) Technical scheme

[0007] In order to solve the above technical problems, the utility model provides a kind of closed mould for PE pipe forming, including outer sleeve, the inner side surface of the outer sleeve is slidably connected with flow guide cover, four shunt columns are symmetrically fixedly connected to the side surface of the flow guide cover, the other end of four The shunt column is fixedly connected with mould core, the other end of the mould core is provided with inner support mechanism, the outer side surface of the outer sleeve is fixedly connected with gas pipe joint, the outer side surface of the outer sleeve is equipped with the circular through hole of intercommunication with the gas pipe joint, the side surface of one of the shunt column is equipped with the circular through hole of intercommunication with the circular through hole of the outer sleeve, the side surface of the mould core is equipped with the circular hole of intercommunication with the circular through hole of the shunt column, the other end of the circular hole of the side surface of the mould core and in the mould core is equipped with the circular hole of the same direction with the mould core, and the other end of the circular hole of the same direction with the mould core and in the mould core is equipped with multiple oblique cooling holes.

[0008] Preferably, the inner support mechanism includes an inner support column, the inner support column is fixedly connected with the end of the mould core, the arc outer side surface of the inner support column is equipped with a cross-shaped sliding groove, the other end of the inner support column is rotatably connected with an adjusting shaft, the other end of the adjusting shaft is fixedly connected with an adjusting handle, the middle part of the adjusting shaft is fixedly connected with an adjusting gear, the side surface of the adjusting gear is provided with four planetary gears, and the adjusting gear is meshingly connected with the planetary gears.

[0009] Preferably, the inner support mechanism further includes four sliding shafts, the sliding shafts are rotatably connected with the inner support column, the sliding shafts are fixedly connected with the planetary gears, the outer side of the sliding shafts is threadedly connected with a sliding seat, the cross section of the sliding seat is T-shaped, the sliding seat is slidably connected in the cross-shaped sliding groove of the inner support column, the two sides of the sliding seat are rotatably connected with a push rod through a rotating shaft, the arc outer side surface of the inner support column is further fixedly connected with four fixed seats, the two sides of the fixed seats are rotatably connected with an inner support rod through a rotating shaft, the other end of the push rod is rotatably connected with the middle part of the inner support rod through a rotating shaft, and the other end of the two inner support rods is rotatably connected with a roller through a rotating shaft.

[0010] Preferably, the other end of the mould core is fixedly connected with a shunt head, the shape of the shunt head is a circular truncated cone, the other end of the shunt head is provided with a filter plate, a plurality of circular through holes are formed in the side surface of the filter plate, and the filter plate is fixedly connected with the outer sleeve.

[0011] Preferably, the other end of the outer sleeve is slidably connected with an inner sleeve, the outer side of the inner sleeve is slidably connected with a locking ring, the side surface of the locking ring is fixedly connected with the outer sleeve through a fixed bolt, the other end side of the outer sleeve is threadedly connected with four centering bolts, and the other end of the outer sleeve is slidably connected with the side surface of the inner sleeve through the centering bolts.

[0012] Preferably, the other end of the inner sleeve is also threadedly connected with four fixing bolts, and the outer side of the fixing bolts is also slidably connected with a sizing sleeve.

[0013] (3)Beneficial effects

[0014] 1、By setting the inner support mechanism, adjusting the gear rotation drives four planetary gears to rotate, the planetary gears rotate to drive the sliding shaft to rotate, the sliding shaft rotates to push the sliding seat to slide to one side, the sliding seat slides to one side to push the roller into contact with the inner wall of the PE pipe, the adjustable inner support mechanism simplifies the operation process and steps, shortens the downtime of the equipment, and improves the flexibility of production.

[0015] 2、By setting the sizing sleeve, the newly extruded and formed PE pipe is prevented from deforming, collapsing and other problems due to high temperature and unstable material, the diameter of the PE pipe is kept stable, and the overall quality and performance of the PE pipe are guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the tracheal joint structure of the utility model;

[0019] Figure 4 It is a schematic diagram of the inner support mechanism structure of the utility model;

[0020] Figure 5 It is a sectional view of the inner support column of the utility model;

[0021] Figure 6 It is a sectional view of the sizing sleeve of the utility model;

[0022] Figure 7 It is a schematic diagram of the centering bolt structure of the utility model.

[0023] The marks in the drawings are: 1-PE pipe, 2-sizing sleeve, 3-inner sleeve, 4-mold core, 5-centering bolt, 6-flow dividing head, 8-outer sleeve, 9-filter plate, 10-mold flange, 11-injection machine flange, 12-tracheal joint, 13-flow guide sleeve, 14-locking ring, 15-fixing bolt, 16-flow dividing column, 17-cooling hole, 18-inner support mechanism, 1801-adjusting handle, 1802-adjusting shaft, 1803-adjusting gear, 1804-planetary gear, 1805-sliding shaft, 1806-sliding seat, 1807-pushing rod, 1808-inner support rod, 1809-roller, 1810-fixing seat, 1811-inner support column. DETAILED DESCRIPTION

[0024] The utility model will be further described below in combination with the drawings and embodiments.

[0025] Embodiment 1

[0026] A closed mold for PE pipe forming, as shown in Figure 1 、 Figure 2 、 Figure 3 , comprises an outer mold cover 8, the inner side surface of the outer mold cover 8 is slidably connected with a flow guide sleeve 13, the flow guide sleeve 13 gradually reduces the wall thickness of the PE pipe 1, the side surface of the flow guide sleeve 13 is fixedly connected with four shunt columns 16, the four shunt columns 16 provide effective support for the mold core 4, the other end of the four shunt columns 16 is fixedly connected with the mold core 4, by setting the mold core 4, the inner wall of the PE pipe 1 is shaped and solidified to a specified size, the other end of the mold core 4 is provided with an inner support mechanism 18, by setting the inner support mechanism 18, the shaped PE pipe 1 is provided with effective inner wall support, at the same time, it has adjustability and can adapt to PE pipes 1 of different diameters, the outer side surface of the outer mold cover 8 is fixedly connected with an air pipe joint 12, the outer side surface of the outer mold cover 8 is provided with a circular through hole in communication with the air pipe joint 12, the side surface of one of the shunt columns 16 is provided with a circular through hole in communication with the circular through hole of the outer mold cover 8, the side surface of the mold core 4 is provided with a circular hole in communication with the circular through hole of the shunt column 16, the other end of the circular hole of the side surface of the mold core 4 and inside the mold core 4 is provided with a circular hole in the same direction as the mold core 4, the other end of the circular hole in the same direction as the mold core 4 and inside the mold core 4 is provided with a plurality of inclined cooling holes 17, the cooling holes 17 are symmetrically arranged on the end surface of the mold core 4, by setting the air pipe joint 12, compressed air is connected into the mold, the mold core 4 is cooled, and the inner wall of the newly formed PE pipe 1 is cooled at the same time.

[0027] As shown in Figure 4 、 Figure 5 , the inner support mechanism 18 comprises an inner support column 1811, one end of the inner support column 1811 is fixedly connected with the end of the mold core 4, the arc-shaped outer side surface of the inner support column 1811 is provided with a cross-shaped sliding groove, the other end of the inner support column 1811 is rotatably connected with an adjusting shaft 1802, the other end of the adjusting shaft 1802 is fixedly connected with an adjusting handle 1801, the middle part of the adjusting shaft 1802 is fixedly connected with an adjusting gear 1803, the side surface of the adjusting gear 1803 is provided with four planetary gears 1804, the adjusting gear 1803 is meshingly connected with the planetary gears 1804, and the adjusting gear 1803 rotates to drive the four planetary gears 1804 to rotate synchronously.

[0028] As shown in Figure 4 、 Figure 5As shown, the inner support mechanism 18 also includes four sliding shafts 1805, which are rotatably connected with the inner support columns 1811, and the end of the sliding shaft 1805 extending to the outside of the inner support column 1811 is fixedly connected with the planetary gear 1804. The outside of the sliding shaft 1805 is threadedly connected with a sliding seat 1806, which is T-shaped in cross section. The sliding seat 1806 is slidably connected in the cross-shaped sliding groove of the inner support column 1811. The two sides of the sliding seat 1806 are rotatably connected with a push rod 1807 through a rotating shaft. The arc-shaped outer side of the inner support column 1811 away from the adjusting gear 1803 is also fixedly connected with four fixed seats 1810. The two sides of the fixed seat 1810 are rotatably connected with an inner support rod 1808 through a rotating shaft. The other end of the push rod 1807 is rotatably connected with the middle part of the inner support rod 1808 through a rotating shaft. The other end of the two inner support rods 1808 is rotatably connected with a roller 1809 through a rotating shaft. The sliding of one end of the push rod 1807 to one side drives the deflection of one end of the inner support rod 1808 to the outside, thereby pushing the roller 1809 into contact with the inner wall of the PE pipe 1 and supporting the inner wall of the PE pipe 1.

[0029] As shown in Figure 2 , the other end of the mold core 4 is fixedly connected with a flow divider 6, which is a circular truncated cone in shape. The flow divider 6 guides the molten PE raw material, accelerates the molding and curing of the PE pipe 1, and is provided at the other end with a filter plate 9. The side of the filter plate 9 is provided with a plurality of circular through holes. The filter plate 9 is fixedly connected with the outer mold sleeve 8, and converts the forwardly rotating molten PE raw material into an axially forwardly moving material through the circular through holes.

[0030] As shown in Figure 2 , Figure 7 , the other end of the outer mold sleeve 8 is slidably connected with an inner mold sleeve 3. The outer side of the inner mold sleeve 3 is slidably connected with a locking ring 14. The side of the locking ring 14 is fixedly connected with the outer mold sleeve 8 through a fixed bolt 15. The other end of the outer mold sleeve 8 is threadedly connected with four centering bolts 5. The four centering bolts 5 pass through the locking ring 14. The centering bolts 5 pass through the other end of the outer mold sleeve 8 and are slidably connected with the side of the inner mold sleeve 3. By rotating the four centering bolts 5, the positions of the inner mold sleeve 3 and the mold core 4 are kept concentric.

[0031] As shown in Figure 6 , the other end of the inner mold sleeve 3 is also threadedly connected with four fixed bolts 15. The outer side of the fixed bolt 15 is also slidably connected with a sizing sleeve 2. By providing the sizing sleeve 2, the newly extruded PE pipe 1 is prevented from deforming, collapsing and other problems due to high temperature and unstable material, the diameter of the PE pipe 1 is kept stable, and the overall quality and performance of the PE pipe 1 are guaranteed.

[0032] The mold is installed, first, the fixed bolt 15 is inserted through the injection machine flange 11, the mold flange 10 and the outer sleeve 8, then the flow guide sleeve 13, the mold core 4 and the shunt head 6 are inserted into the other end of the outer sleeve 8, the end of the shunt head 6 is contacted with the filter plate 9 by pushing the mold core 4 inward, then the inner sleeve 3 is inserted into the other end of the outer sleeve 8, and the locking ring 14 is sleeved on the outside of the inner sleeve 3, the locking ring 14 and the outer sleeve 8 are fixedly connected by using the fixed bolt 15, the position of the inner sleeve 3 is adjusted by rotating the four centering bolts 5 with a wrench, then the sizing sleeve 2 is installed at the other end of the inner sleeve 3 through the fixed bolt 15, finally, according to the specified inner diameter of the PE pipe 1, the inner support mechanism 18 is adjusted to the specified diameter, the air pipe of the air compressor is fixedly connected with the air pipe joint 12 outside the outer sleeve 8, at this time, the injection machine can be started to extrude and form the PE pipe 1.

[0033] After the mold is installed, when the mold is used to extrude and form the PE pipe 1, the PE raw material in a molten state moves forward along the rotation of the cylinder under the rotation and pushing of the screw, the PE raw material in a molten state passes through the filter plate 9 and converts the rotation forward movement into axial forward movement, the PE raw material moving axially forward enters between the mold core 4 and the flow guide sleeve 13 through the guide of the shunt head 6, the wall thickness gradually decreases and continues to move axially forward, the PE raw material moving axially forward is extruded by the inner sleeve 3 and the mold core 4 to generate a PE pipe 1 with a specified diameter, the formed PE pipe 1 continues to move forward to the inner support mechanism 18 and the sizing sleeve 2 to shape the inner wall and outer wall of the PE pipe 1, the sizing sleeve 2 prevents the newly extruded and formed PE pipe 1 from deforming, collapsing and other problems due to high temperature and unstable material, maintains the stability of the diameter of the PE pipe 1, ensures the overall quality and performance of the PE pipe 1, the air compressor enters the circular through hole of the outer sleeve 8 through the air pipe joint 12, the compressed air enters the circular through hole of the shunt column 16 through the circular through hole of the outer sleeve 8, the compressed air enters the circular hole of the mold core 4 through the circular through hole of the shunt column 16, the compressed air enters the circular hole of the mold core 4 in the same direction through the circular hole of the mold core 4, the compressed air is sprayed out of the inclined cooling hole 17 at the other end of the mold core 4 through the circular hole of the mold core 4 in the same direction, and the inner wall of the formed PE pipe 1 is cooled, the extruded and formed PE pipe 1 enters the cooling water tank for fixing and shaping, and the shaped PE pipe 1 can be cut to different lengths according to requirements to meet the use and transportation requirements.

[0034] After the mold is installed, according to the specified inner diameter of the PE pipe 1, the inner support mechanism 18 is adjusted to the specified diameter, the adjusting handle 1801 is rotated, the adjusting handle 1801 drives the adjusting shaft 1802 to rotate, the adjusting shaft 1802 drives the adjusting gear 1803 to rotate, the adjusting gear 1803 is connected with the four planetary gears 1804 in meshing, the adjusting gear 1803 drives the four planetary gears 1804 to rotate, the planetary gears 1804 drive the sliding shaft 1805 to rotate, under the action of the threads outside the sliding shaft 1805, the sliding shaft 1805 rotates to push the sliding seat 1806 to slide inside the cross-shaped sliding groove of the inner support column 1811, the sliding seat 1806 slides to push one end of the two push rods 1807 to slide, under the action of the rotating shaft in the middle of the inner support rod 1808, one end of the push rod 1807 slides to push the inner support rod 1808 to deflect around the rotating shaft of the fixed seat 1810 as the center, the inner support rod 1808 deflects around the rotating shaft of the fixed seat 1810 as the center to push the roller 1809 at the other end of the inner support rod 1808 to contact the inner wall of the PE pipe 1, at this time, the inner support mechanism 18 can provide effective support for the inner wall of the PE pipe 1, and the adjustable inner support mechanism 18 simplifies the operation process and steps, shortens the downtime of the equipment, and improves the flexibility of production.

[0035] The above-described embodiments only express the preferred embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications, improvements and substitutions can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A closed mold for forming a PE pipe, characterized by, The utility model provides a kind of airway mould, including outer sleeve (8), the inner side of outer sleeve (8) is slidably connected with flow guide cover (13), the side of flow guide cover (13) is symmetrically fixedly connected with four shunt columns (16), another end of four shunt columns (16) is fixedly connected with mould core (4), another end of mould core (4) is provided with inner support mechanism (18), the outer side of outer sleeve (8) is fixedly connected with tracheal joint (12), the outer side of outer sleeve (8) is opened with the circular through-hole of communication with tracheal joint (12), the side of one shunt column (16) is opened with the circular through-hole of communication with the circular through-hole of outer sleeve (8), the side of mould core (4) is opened with the circular hole of communication with the circular through-hole of shunt column (16), another end of the circular hole of the side of mould core (4) and in the inside of mould core (4) is opened with the circular hole of the same direction with mould core (4), another end of the circular hole of the same direction with mould core (4) and in the inside of mould core (4) is opened with multiple oblique cooling holes (17).

2. The closed mold for forming a PE pipe according to claim 1, wherein The inner support mechanism (18) includes an inner support column (1811) fixedly connected to the end of the mold core (4), an arc-shaped outer side of the inner support column (1811) is provided with a cross-shaped sliding groove, the other end of the inner support column (1811) is rotatably connected with an adjusting shaft (1802), the other end of the adjusting shaft (1802) is fixedly connected with an adjusting handle (1801), the middle part of the adjusting shaft (1802) is fixedly connected with an adjusting gear (1803), the side of the adjusting gear (1803) is provided with four planetary gears (1804), and the adjusting gear (1803) is meshingly connected with the planetary gears (1804).

3. The closed mold for forming a PE pipe according to claim 2, wherein The inner support mechanism (18) further includes four sliding shafts (1805) rotatably connected with the inner support column (1811), the sliding shafts (1805) are fixedly connected with the planetary gears (1804), the outer sides of the sliding shafts (1805) are threadedly connected with sliding seats (1806), the sliding seats (1806) have a T-shaped cross section, the sliding seats (1806) are slidably connected in the cross-shaped sliding groove of the inner support column (1811), the two sides of the sliding seats (1806) are rotatably connected with push rods (1807) through pivots, the arc-shaped outer side of the inner support column (1811) is further fixedly connected with four fixed seats (1810), the two sides of the fixed seats (1810) are rotatably connected with inner support rods (1808) through pivots, the other end of the push rod (1807) is rotatably connected with the middle part of the inner support rod (1808) through a pivot, and the other end of the two inner support rods (1808) is rotatably connected with rollers (1809) through a pivot.

4. The closed mold for forming a PE pipe according to claim 3, wherein Another end of the mold core (4) is fixedly connected with a flow divider head (6), the flow divider head (6) is in the shape of a circular truncated cone, another end of the flow divider head (6) is provided with a filter plate (9), a plurality of circular through holes are formed in the side surface of the filter plate (9), and the filter plate (9) is fixedly connected with the outer mold sleeve (8).

5. The closed mold for forming a PE pipe according to claim 4, wherein Another end of the outer mold sleeve (8) is slidably connected with an inner mold sleeve (3), the outer side of the inner mold sleeve (3) is slidably connected with a locking ring (14), the side surface of the locking ring (14) is fixedly connected with the outer mold sleeve (8) through fixed bolts (15), and the other end side of the outer mold sleeve (8) is threadedly connected with four centering bolts (5), and the centering bolts (5) are slidably connected with the side surface of the inner mold sleeve (3) through the other end of the outer mold sleeve (8).

6. The closed mold for forming a PE pipe according to claim 5, wherein The other end of the inner mold sleeve (3) is also threadedly connected with four fixed bolts (15), and the outer side of the fixed bolts (15) is also slidably connected with a sizing sleeve (2).

Images