A mold for adjusting diagonal deviation of PVC pipe and adjustment method thereof

Abstract

The present invention provides a mold for adjusting the diagonal deviation of PVC pipes, comprising an outer mold base, an inner mold body and a diverter plate, the inner mold body comprising a diverter tip, a diverter cone connected to the diverter tip, a shrink core and a mold core connected to the shrink core, the diverter tip is provided with a raised elliptical arc surface on the circumferential outer wall near one end of the diverter channel inlet, the outer mold base is provided with an elliptical channel on the circumferential inner wall at a position corresponding to the elliptical arc surface, and the outer mold base is provided with a rotating drive mechanism for driving the diverter tip to rotate to change the size of the gap between the elliptical arc surface and the elliptical channel; a method for adjusting the diagonal deviation of PVC pipes is also provided; the present invention establishes a special mold pressure rapid adjustment compensation molding mode, when the product is diagonally thick or thin, the diverter tip in the rotating mold is quickly compensated, thereby solving the problem of diagonal wall thickness of the product and meeting the production requirements of high-performance products.

Description

Technical Field

[0001] The invention relates to the field of PVC pipe moulds, and more particularly to a mould for adjusting diagonal deviation of PVC pipes and an adjustment method thereof. Background Art

[0002] During the production process of traditional PVC water supply and drainage pipe molds, there are always problems with the product wall thickness being too thick or too thin diagonally (both diagonals are too thick or too thin) or the local wall thickness deviation cannot be adjusted. This may be caused by equipment wear, material flow and other reasons. At present, there is no mold that can be used to adjust the diagonal deviation of PVC pipes. Generally, the only way to adjust it is to replace the mold or change the equipment matching, which greatly reduces production efficiency. For example, Chinese patent CN209224532U discloses a biaxial stretching pipe mold, which changes the single axial orientation of the traditional molding melt into a molding method of axial and radial synchronous stretching, thereby reducing production costs and improving quality. However, it cannot change the flow of materials to adjust the diagonal deviation of the pipe. Summary of the invention

[0003] The present invention is to overcome the problem described in the above background technology that there is currently no mold that can be used to adjust the diagonal deviation of PVC pipes, and generally the only way to adjust is to replace the mold or change the equipment matching, which greatly reduces the production efficiency. A mold for adjusting the diagonal deviation of PVC pipes and an adjustment method thereof are provided. The present invention solves the problem of diagonal wall thickness deviation of products and meets the production requirements of high-performance products.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a mold for adjusting the diagonal deviation of PVC pipes, comprising an outer mold base, an inner mold body and a diverter plate, the inner mold body comprising a diverter tip, a diverter cone connected to the diverter tip, a shrinking core and a mold core connected to the shrinking core, the diverter cone and the shrinking core are respectively connected to the opposite two side surfaces of the inner ring of the diverter plate, the outer mold base is connected to the opposite two side surfaces of the outer ring of the diverter plate, a diverter channel is formed between the diverter tip and the diverter cone and the outer mold base, an extrusion channel is formed between the mold core and the shrinking core and the outer mold base, the diverter channel and the extrusion channel are connected through the diverter plate, the circumferential outer wall of the diverter tip near one end of the diverter channel inlet is provided with a raised elliptical arc surface, the circumferential inner wall of the outer mold base at the corresponding position of the elliptical arc surface is provided with an elliptical channel, and the outer mold base is provided with a rotating drive mechanism for driving the diverter tip to rotate to change the gap size between the elliptical arc surface and the inner wall of the elliptical channel.

[0005] Furthermore, the outer die base includes an inlet die base, a main die base and an outlet die, the main die base includes a first die base and a second die base clamped on opposite sides of the diverter plate, the first die base is connected to the inlet die base, the second die base is connected to the outlet die, the inlet die base and the first die base form the diversion channel with the diversion tip and the diversion cone, the second die base and the outlet die form the extrusion channel with the shrinkage core and the die core; the elliptical channel is located on the circumferential inner wall of the inlet die base.

[0006] Furthermore, the rotary drive mechanism includes a power device, a driving wheel, a driving wheel and a transmission shaft, the power device is installed on the outer mold base, the driving wheel is connected to the output end of the power device, an inner hole is also opened at the center of the diverter plate, the driving wheel is located in the inner hole, the driving wheel is fixedly sleeved on one end of the transmission shaft, the axis line of the inner hole is parallel to the axis line of the driving wheel, and the other end of the transmission shaft axially passes through the inner cavity provided in the diverter cone and is connected to the end of the diverter tip close to the diverter cone, and a belt drive or a chain drive is formed between the driving wheel and the driving wheel.

[0007] Furthermore, the power device is a motor, and the driving wheel is fixedly sleeved on the output shaft of the motor.

[0008] Furthermore, the driving wheel is provided with an angle scale.

[0009] Furthermore, a fixing bracket is provided on the outer mold base, and the base of the motor is installed on the fixing bracket.

[0010] Furthermore, a gasket is provided between the diverter tip and the diverter cone; and a shrink sleeve is provided between the second die base and the die.

[0011] Furthermore, bearings used in conjunction with the transmission shaft are respectively provided in the inner cavity and the inner hole.

[0012] Preferably, a groove is further provided on one end surface of the shrink core close to the diverter plate, the transmission shaft extends into the groove, and a locking nut is further connected to one end of the transmission shaft located in the groove.

[0013] A method for adjusting the diagonal deviation of a PVC pipe is also provided. The above-mentioned mold for adjusting the diagonal deviation of a PVC pipe is characterized in that it comprises the following steps:

[0014] S1. When the product is diagonally or partially thick or thin, determine the direction and position of the deviation;

[0015] S2. If the diagonal thickness is uniform or partially thick, determine the diagonal thickening point, and drive the diverter tip to rotate along its axis through a rotary drive mechanism so that the maximum outer diameter of the elliptical arc surface on the diverter tip corresponds to the diagonal thickening point;

[0016] S3. If the diagonals are all thin or partially thin, determine the diagonal thinning point, and drive the diverter tip to rotate along its axis through a rotary drive mechanism so that the minimum outer diameter of the elliptical arc surface on the diverter tip corresponds to the diagonal thinning point.

[0017] Compared with the prior art, the beneficial effects are:

[0018] The present invention adopts a rotatable diverter tip and a unique elliptical arc surface design of the outer wall of the diverter tip at the front end of the mold diverter, and cooperates with the elliptical channel of the outer mold base to establish a special mold pressure rapid adjustment compensation molding method. When the product is diagonally thick or thin, the diverter tip inside the rotating mold is used to quickly compensate, thereby solving the problem of diagonal wall thickness of the product and meeting the production needs of high-performance products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of Example 1.

[0020] Figure 2 It is a structural schematic diagram of the diverter plate in Example 1.

[0021] Figure 3 yes Figure 1 Section A-A in the middle.

[0022] Figure 4 yes Figure 3 Schematic diagram of the middle splitter tip after rotating 90°.

[0023] Figure 5 yes Figure 3 Schematic diagram of the middle splitter tip after counterclockwise rotation. DETAILED DESCRIPTION

[0024] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0025] Example 1

[0026] like Figure 1As shown, a mold for adjusting the diagonal deviation of a PVC pipe comprises an outer mold base 10, an inner mold body 20 and a diverter plate. The inner mold body 20 comprises a diverter tip 21, a diverter cone 22 connected to the diverter tip 21, a shrink core 23 and a mold core 24 connected to the shrink core 23. The diverter cone 22 and the shrink core 23 are respectively connected to the opposite two side surfaces of the inner ring of the diverter plate. The outer mold base 10 is connected to the opposite two side surfaces of the outer ring of the diverter plate. A diverter channel 1 is formed between the diverter tip 21 and the diverter cone 22 and the outer mold base 10. The mold core 24 and the shrink core 23 are connected to the outer mold base 10. An extrusion channel 2 is formed between the die bases 10, and the diverter channel 1 is connected to the extrusion channel 2 through a diverter plate. A raised elliptical arc surface 211 is provided on the circumferential outer wall of the diverter tip 21 near the inlet of the diverter channel 1. An elliptical channel 111 is provided on the circumferential inner wall of the outer die base 10 at a position corresponding to the elliptical arc surface 211. A rotating drive mechanism 40 is provided on the outer die base 10 for driving the diverter tip 21 to rotate. The rotating drive mechanism 40 drives the diverter tip 21 to rotate, which can change the size of the gap between the elliptical arc surface 211 and the inner wall of the elliptical channel 111. The elliptical arc surface 211, that is, the cross section of the diverter tip 21 at this position is a first elliptical shape, and both sides also have an arc surface flow guide structure; the elliptical channel 111, that is, the internal channel of the feed die base at this position is a second elliptical shape, and both sides also have an arc surface flow guide structure; the size of the second ellipse is larger than that of the first ellipse, and the two ellipses are almost located in the same plane. The outer die base 10 includes the feed die base 11, the main die base and the mouth die 14. The main die base includes a The first die base 12 and the second die base 13 are on opposite sides, the first die base 12 is connected to the feeding die base 11, the second die base 13 is connected to the mouth die 14, and a shrink sleeve 15 is also provided between the second die base 13 and the mouth die 14; a diversion channel 1 is formed between the feeding die base 11 and the first die base 12 and the diversion tip 21 and the diversion cone 22, and an extrusion channel 2 is formed between the second die base 13 and the mouth die 14 and the shrinkage core 23 and the die core 24; the elliptical channel 111 is located on the circumferential inner wall of the feeding die base 11.

[0027] The rotary drive mechanism 40 includes a power device 41, a driving wheel 42, a driving wheel 45 and a transmission shaft 46. The power device 41 is installed on the outer mold base 10. The driving wheel 42 is connected to the output end of the power device 41. The center of the diverter plate is also provided with an inner hole 31. The driving wheel 45 is located in the inner hole 31. The driving wheel 45 is fixedly sleeved on one end of the transmission shaft 46. The axis of the inner hole 31 is parallel to the axis of the driving wheel 45. The other end of the transmission shaft 46 axially passes through the inner cavity 221 provided in the diverter cone 22 and connects to the end of the diverter tip 21 close to the diverter cone 22. A chain 43 transmission is formed between the driving wheel 45 and the driving wheel 42. In other embodiments, a belt transmission can also be formed, which has an equivalent effect.

[0028] In this embodiment, the power device 41 is a motor, and the driving wheel 42 is fixedly sleeved on the output shaft of the motor; a fixed bracket 44 is provided at a position of the outer mold base 10 close to the diverter plate, and the base of the motor is installed on the fixed bracket 44.

[0029] An angle scale is provided on the driving wheel 42. This is to ensure the accuracy of adjustment. The driving wheel 42 is provided with a zero and angle scale display, and the angle can be observed at all times and accurately adjusted to achieve the purpose of rapid adjustment.

[0030] A gasket is provided between the diverter tip 21 and the diverter cone 22; the gasket is made of high temperature resistant material and has the characteristics of low friction and high elasticity, ensuring that no rigid friction is generated after the end faces of the two parts come into contact.

[0031] The inner cavity 221 and the inner hole 31 are provided with bearings 222 for use with the transmission shaft 46. In order to reduce the rotation error of the diverter tip 21, the transmission shaft 46 is equipped with bearings 222 at the front and rear ends, and its operation accuracy is controlled by the support of the bearings 222.

[0032] A groove 231 is also provided on one end face of the shrink core 23 close to the diverter plate, and the transmission shaft 46 extends into the groove 231. A locking nut 232 is also connected to one end of the transmission shaft 46 located in the groove 231. The groove 231, the inner hole 31 and the inner cavity 221 of the diverter cone 22 form a same cavity, providing space for the arrangement and rotation of the transmission shaft 46. To ensure that the diverter tip 21 is always tightly fitted with the gasket without leakage, the transmission shaft 46 is locked and fixed by a locking nut 232 arranged on the side of the diverter plate close to the shrink core 23, and a plane thrust bearing 233 is arranged between the locking nut 232 and the diverter plate. The plane thrust bearing 233 separates the two parts from direct contact, so that when the diverter tip 21 rotates, the locking nut 232 will not generate resistance with the diverter plate, ensuring the smoothness of rotation.

[0033] In actual use of this embodiment, the extruded molten melt enters the die through the feed die base 11, and then passes through the diversion channel 1 formed by the diversion tip 21, the diversion cone 22 and the outer die base 10 to divert the cylindrical solid melt into a hollow cone, and then passes through the diversion plate for gradual diversion. The structure of the diversion plate is as follows: Figure 2 As shown, it includes an inner hole 31 and a plurality of diversion holes on the outer side. The chain 43 penetrates into the inner hole 31 through the ribs 32 of the diverter plate and is connected to the driving wheel 45, which will not cause leakage. The melt is diverted by a continuous cone into multiple dispersed small streams, and then passes through the shrinkage channel (the front section of the extrusion channel 2) formed by the shrinkage core 23 and the shrinkage sleeve 15, and the multiple dispersed melts are merged and guided into the molding section (the rear section of the extrusion channel 2) formed by the die 14 and the die core 24 for pre-forming of the shape and size. After passing through the molding section, the melt is extruded to form a pipe base tube.

[0034] The difference between this embodiment and the general mold is that the pressure compensation adjustment area is set at the front end of the mold. The area is mainly composed of the diverter tip 21 and the feed die base 11. The feed die base 11 is fixed to the first die base 12 by fastening screws and cannot be rotated or moved. The outer cylindrical surface of the diverter tip 21 is not straight, and has a section of convex elliptical arc surface 211, while the inner hole 31 of the feed die base 11 has a section of convex elliptical arc surface 211, which promotes the formation of a unique non-circular channel between the two parts, such as Figure 3 As shown in the figure, A and B are not equal in size. When they are not rotating in the original state, their annular gap t is balanced and consistent. If there is no deviation problem, it can be used as a normal mold. When the product is diagonally or partially thick or thin, according to the direction and position of the deviation, the motor is started to drive the driving wheel 42 and the chain 43 to operate, and the driving wheel 45 of the chain 43 rotates, while the diverter tip 21 and the sprocket are fastened by the plane pin, and the driving wheel 45 drives the rotation of the diverter tip 21. The rotation angle is adjusted according to the product deviation, such as Figure 5 As shown, according to the actual situation, adjust any angle. If it rotates counterclockwise, within the range of 90°, t4 gradually increases and t3 gradually decreases. If the product is thicker at both corners, the diverter tip 21 rotates to the position of the maximum outer diameter of the ellipse, corresponding to the thicker point of the product at both corners, such as Figure 4 As shown, it is equivalent to reducing the flow channel of this diagonal point in the diverter channel 1. In the figure, t2 is greater than t1. The reduction of the channel reduces the accumulation of the melt in the diagonal part, thereby reducing the wall thickness of this diagonal position, achieving the expected adjustment correction; if both diagonals are thin, then adjust the opposite way and adjust the minimum position of the elliptical arc surface to the corresponding point. This embodiment uses a rotatable diverter tip 21 and a unique elliptical arc surface design on the outer wall of the diverter tip 21 at the front end of the mold diverter, and cooperates with the elliptical channel of the outer mold base to establish a special mold pressure rapid adjustment compensation molding method. When the product is diagonally thick, the diverter tip 21 in the rotating mold is quickly compensated, thereby solving the problem of diagonal wall thickness of the product and meeting the production requirements of high-performance products.

[0035] Example 2

[0036] This embodiment provides a method for adjusting the diagonal deviation of a PVC pipe, based on the mold for adjusting the diagonal deviation of a PVC pipe in Embodiment 1, comprising the following steps:

[0037] S1. When the product is diagonally or partially thick or thin, determine the direction and position of the deviation;

[0038] S2. If the diagonal thickness is uniform or partially thick, determine the diagonal thickening point, and drive the diverter tip to rotate along its axis through a rotary drive mechanism, so that the maximum outer diameter of the elliptical arc surface on the diverter tip corresponds to the diagonal thickening point, so as to reduce the flow passage of this diagonal point at the diverter channel, thereby reducing the wall thickness of this diagonal position;

[0039] S3. If the diagonals are all thin or partially thin, determine the diagonal thinning point, and drive the diverter tip to rotate along its axis through a rotary drive mechanism so that the minimum outer diameter of the elliptical arc surface on the diverter tip corresponds to the diagonal thinning point, so as to increase the flow channel of this diagonal point in the diverter channel, thereby increasing the wall thickness of this diagonal position.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A mold for adjusting the diagonal deviation of a PVC pipe, comprising an outer mold base (10), an inner mold body (20) and a diverter plate (30), wherein the inner mold body (20) comprises a diverter tip (21), a diverter cone (22) connected to the diverter tip (21), a shrink core (23) and a mold core (24) connected to the shrink core (23), wherein the diverter cone (22) and the shrink core (23) are respectively connected to opposite side surfaces of an inner ring of the diverter plate (30), wherein the outer mold base (10) is connected to opposite side surfaces of an outer ring of the diverter plate (30), wherein a diverter channel (1) is formed between the diverter tip (21) and the diverter cone (22) and the outer mold base (10), wherein an extrusion channel (2) is formed between the mold core (24) and the shrink core (23) and the outer mold base (10), wherein the diverter channel (1) and the extrusion channel (2) are connected through the diverter plate (30), wherein: The circumferential outer wall of the diverter tip (21) close to one end of the inlet of the diverter channel (1) is provided with a raised elliptical arc surface (211); the circumferential inner wall of the outer mold base (10) at a position corresponding to the elliptical arc surface (211) is provided with an elliptical channel (111); and the outer mold base (10) is provided with a rotating drive mechanism (40) for driving the diverter tip (21) to rotate so as to change the size of the gap between the elliptical arc surface (211) and the inner wall of the elliptical channel (111); The outer die base (10) comprises an inlet die base (11), a main die base and a mouth die (14); the main die base comprises a first die base (12) and a second die base (13) clamped on opposite sides of the diverter plate (30); the first die base (12) is connected to the inlet die base (11); the second die base (13) is connected to the mouth die (14); the diversion channel (1) is formed between the inlet die base (11) and the first die base (12) and the diversion tip (21) and the diversion cone (22); the extrusion channel (2) is formed between the second die base (13) and the mouth die (14) and the shrinkage core (23) and the die core (24); the elliptical channel (111) is located on the circumferential inner wall of the inlet die base (11); The rotary drive mechanism (40) comprises a power device (41), a driving wheel (42), a driving wheel (45) and a transmission shaft (46); the power device (41) is mounted on the outer mold base (10); the driving wheel (42) is connected to the output end of the power device (41); an inner hole (31) is also provided at the center of the diverter plate (30); the driving wheel (45) is located in the inner hole (31); the driving wheel (45) is fixedly sleeved on one end of the transmission shaft (46); the axis of the inner hole (31) is parallel to the axis of the driving wheel (45); and the other end of the transmission shaft (46) axially passes through an inner cavity (221) provided in the diverter cone (22) and is connected to one end of the diverter tip (21) close to the diverter cone (22); a belt drive or a chain (43) drive is formed between the driving wheel (45) and the driving wheel (42); The power device (41) is a motor, and the driving wheel (42) is fixedly sleeved on the output shaft of the motor; the driving wheel (42) is provided with an angle scale.

2. The mold for adjusting the diagonal deviation of PVC pipes according to claim 1, characterized in that: The outer mold base (10) is provided with a fixing bracket (44), and the base of the motor is mounted on the fixing bracket (44).

3. The mold for adjusting the diagonal deviation of PVC pipe according to claim 1, characterized in that: A shrink sleeve (15) is further provided between the second die base (13) and the die (14), and a gasket (25) is provided between the diverter tip (21) and the diverter cone (22).

4. The mold for adjusting the diagonal deviation of PVC pipe according to claim 1, characterized in that: Bearings (222) for use with the transmission shaft (46) are also provided in the inner cavity (221) and the inner hole (31), respectively.

5. The mold for adjusting the diagonal deviation of PVC pipe according to claim 1, characterized in that: A groove (231) is also provided on one end surface of the shrinkage core (23) close to the diverter plate (30), the transmission shaft (46) extends into the groove (231), and a locking nut (232) is also connected to one end of the transmission shaft (46) located in the groove (231).

6. A method for adjusting the diagonal deviation of a PVC pipe, based on the mold for adjusting the diagonal deviation of a PVC pipe as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1. When the product is diagonally or partially thick or thin, determine the direction and position of the deviation; S2. If the diagonal thickness is uniformly or partially thick, determine the diagonal thickening point, and drive the diverter tip (21) to rotate along its axis through the rotary drive mechanism (40) so that the maximum outer diameter of the elliptical arc surface (211) on the diverter tip (21) corresponds to the diagonal thickening point; S3. If the diagonal thinning is uniform or partially thin, determine the diagonal thinning point, and drive the diverter tip (21) to rotate along its axis through the rotary drive mechanism (40) so that the minimum outer diameter of the elliptical arc surface (211) on the diverter tip (21) corresponds to the diagonal thinning point.

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