An automatic eccentric adjustment mechanism for a mold

Abstract

An automatic eccentric adjustment mechanism for a mold relates to the field of mold technology. A die is provided on the outer periphery of a mandrel. A mandrel mounting seat is located on one side of the mandrel, and a locking plate is located on the other side. The locking plate, mandrel, and mandrel mounting seat are connected by a mandrel fixing screw and secured with a nut. A die fixing flange is fixed to the outer periphery of the die. A die mounting seat is located on one side of the die and the die fixing flange. The die fixing flange and the die mounting seat are fixed by a plurality of die locking screws evenly distributed around the circumference. A plurality of adjusting cylinders are evenly distributed around the outer circumference of the die mounting seat. The piston rod end of the adjusting cylinder contacts the outer wall of the die. A sealing ring is installed between the die and the die fixing flange. This invention adjusts the radial position of the die by adjusting the forward and backward movement of the cylinders, thereby adjusting the width of the flow channel. This results in a qualified pipe wall thickness at the exit of the die and mandrel, improving production efficiency and reducing production costs.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and more specifically to an automatic eccentric adjustment mechanism for molds. Background Technology

[0002] PE pipes, also known as polyethylene pipes, are hygienic, non-toxic, and do not scale, making them more suitable for urban and rural water supply mains and buried pipes. They are safe, hygienic, economical, easy to construct, and have a long service life. They also have good resistance to rust, flexibility, and economy, and are gradually replacing ductile iron. With urban development and the construction of underground pipe corridors, there is an increasing demand for large-diameter, high-pressure, and thick-walled PE pipes, which places higher demands on the production of large-diameter PE pipes.

[0003] Currently, in the production of large-diameter plastic pipes, especially PE pipes over 450mm, gravity causes significant eccentricity in the upper and lower wall thicknesses. Manual adjustment is currently used, which presents challenges such as difficulty in controlling eccentricity, cumbersome mold wall thickness adjustment, and the risk of burns to workers during mold adjustment. This leads to low production efficiency, increased costs, and material waste. Therefore, those skilled in the art have provided an automatic eccentricity adjustment mechanism for molds to solve the problems mentioned in the background. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic eccentricity adjustment mechanism for molds to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: It includes an adjusting cylinder, a die locking screw, a sealing ring, a die, a mandrel, a mandrel fixing screw, a locking pressure plate, a die mounting seat, a mandrel mounting seat, and a die fixing flange; the die is provided on the outer periphery of the mandrel; a mandrel mounting seat is provided on one side of the mandrel, and a locking pressure plate is provided on the other side; the locking pressure plate, mandrel, and mandrel mounting seat are connected by the mandrel fixing screw and fixed with a nut; a die fixing flange is fixed on the outer periphery of the die, and a die mounting seat is provided on one side of the die and the die fixing flange; the die fixing flange and the die mounting seat are fixed by a plurality of die locking screws evenly distributed around the circumference, and the outer wall of the die mounting seat is evenly distributed with... Several adjusting cylinders are provided, with the piston rod end of the adjusting cylinder contacting the outer wall of the die; a sealing ring is installed between the die and the die fixing flange; flow channels are provided between the die and the mandrel, and between the die mounting base and the mandrel mounting base; the number of adjusting cylinders is four, eight, or sixteen, wherein two adjusting cylinders at 180° angles move in opposite directions, i.e., their piston rods advance and retract once; four adjusting cylinders have two advancing and two retracting piston rods; eight adjusting cylinders have four advancing and four retracting piston rods; and sixteen adjusting cylinders have eight advancing and eight retracting piston rods; a grating ruler and a self-locking valve are installed on the adjusting cylinders; a first limit is provided on the die, and a second limit is provided on the die mounting base to cooperate with the first limit.

[0006] The beneficial effects of adopting the above structure are as follows: The automatic eccentric adjustment mechanism for molds described in this invention can adjust the radial position of the die by adjusting the advance and retreat of the hydraulic cylinder, thereby adjusting the width of the flow channel. As a result, qualified pipe wall thickness can be obtained when exiting the die and mandrel, which improves production efficiency and reduces labor costs and production costs. Attached Figure Description

[0007] Figure 1 This is a structural diagram of the present invention.

[0008] Explanation of reference numerals in the attached figures:

[0009] 1. Adjusting cylinder; 2. Die locking screw; 3. Sealing ring; 4. Die; 5. Mandrel; 6. Mandrel fixing screw; 7. Locking pressure plate; 8. Die mounting seat; 9. Mandrel mounting seat; 10. Die fixing flange; 11. Flow channel; 12. Grating ruler; 13. Self-locking valve; 14. First limit; 15. Second limit; 16. First mounting hole; 17. Second mounting hole. Detailed Implementation

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] See as Figure 1 As shown, this specific embodiment adopts the following technical solution: It includes an adjusting cylinder 1, a die locking screw 2, a sealing ring 3, a die 4, a mandrel 5, a mandrel fixing screw 6, a locking pressure plate 7, a die mounting seat 8, a mandrel mounting seat 9, and a die fixing flange 10; the die 4 is provided on the outer periphery of the mandrel 5, a mandrel mounting seat 9 is provided on one side of the mandrel 5, and a locking pressure plate 7 is provided on the other side. The locking pressure plate 7, the mandrel 5, and the mandrel mounting seat 9 are connected by the mandrel fixing screw 6 and fixed by a nut; the die fixing flange 10 is fixed on the outer periphery of the die 4, and the die 4 and the die fixing flange 10 are connected by a locking screw 6. A die mounting base 8 is provided on one side. The die fixing flange 10 is fixed to the die mounting base 8 by a number of die locking screws 2 evenly distributed around the circumference, thereby fixing the die 4 on the die mounting base 8. Four, eight or sixteen adjusting cylinders 1 are evenly distributed around the outer circumference of the outer wall of the die mounting base 8. The piston rod end of the adjusting cylinder 1 contacts the outer wall of the die 4. The two adjusting cylinders 1 that are 180° apart move in opposite directions, that is, their piston rods move in one forward and one backward. The piston rods of the four adjusting cylinders 1 move in two forward and two backward. The piston rods of the eight adjusting cylinders 1 move in four forward and four backward. The piston rods of the sixteen adjusting cylinders 1 move in eight forward and eight backward.

[0012] A sealing ring 3 is installed between the die 4 and the die fixing flange 10. Its function is to ensure that there is no material leakage between the die 4 and the die mounting seat 8 when the die 4 moves radially. In addition, the locking pressure applied by the die locking screw 2 further ensures that the die 4 and the die mounting seat 8 can move in parallel without material leakage.

[0013] A flow channel 11 is provided between the die 4 and the mandrel 5 and between the die mounting base 8 and the mandrel mounting base 9. The wall thickness of the resulting pipe can be adjusted by adjusting the width of the flow channel 11.

[0014] The die 4 is provided with a first limit 14, and the die mounting base 8 is provided with a second limit 15 that cooperates with the first limit 14. The first limit 14 and the second limit 15 are used for the maximum stroke of the die 4 in radial movement.

[0015] The adjusting cylinder 1 is equipped with a grating ruler 12 and a self-locking valve 13. After the gap is adjusted, the adjusting cylinder 1 will remain in a fixed position for a long time under the action of the self-locking valve 13. The grating ruler 12 is used to control the required adjustment amount in real time to achieve the required adjustment progress, thereby obtaining the required pipe wall thickness.

[0016] The working principle of this invention is as follows: the die mounting base 8 is fixed to the extruder through the first mounting hole 16, and the die 4 is fixed to the pipe mold through the second mounting hole 17. When it is necessary to adjust the width of the flow channel 11, the adjusting cylinder 1 is operated. By adjusting the cylinder 1 to move forward and backward, the radial position of the die 4 can be adjusted, thereby adjusting the width of the flow channel 11. As a result, a qualified pipe wall thickness can be obtained when exiting the die and mandrel, which improves production efficiency and reduces labor costs and production costs.

[0017] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An automatic eccentric adjustment mechanism for a mold, characterized in that: The device includes adjusting cylinders, die locking screws, sealing rings, a die, a mandrel, a mandrel fixing screw, a locking plate, a die mounting base, a mandrel mounting base, and a die fixing flange. The die is mounted on the outer periphery of the mandrel. A mandrel mounting base is located on one side of the mandrel, and a locking plate is located on the other side. The locking plate, mandrel, and mandrel mounting base are connected by the mandrel fixing screw and secured with nuts. A die fixing flange is fixed to the outer periphery of the die. A die mounting base is located on one side of the die and the die fixing flange. The die fixing flange and the die mounting base are secured by several die locking screws evenly distributed around the circumference. Several adjusting cylinders are evenly distributed around the outer circumference of the die mounting base. The piston rod end of the cylinder contacts the outer wall of the die; a sealing ring is installed between the die and the die fixing flange; flow channels are provided between the die and the mandrel, and between the die mounting base and the mandrel mounting base; the number of adjusting cylinders is four, eight, or sixteen, wherein two adjusting cylinders at 180° angles move in opposite directions, i.e., their piston rods move in one forward and one backward; the piston rods of four adjusting cylinders move in two forward and two backward; the piston rods of eight adjusting cylinders move in four forward and four backward; and the piston rods of sixteen adjusting cylinders move in eight forward and eight backward; a grating ruler and a self-locking valve are installed on the adjusting cylinder; a first limit is provided on the die, and a second limit is provided on the die mounting base that cooperates with the first limit.

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