A rotor suspension injection molding preparation process and injection mold

Abstract

The present invention provides a rotor suspension injection molding preparation process and an injection mold, belonging to the field of injection molding technology. It solves the technical problem that the existing rotor injection molding needs to be carried out in multiple times, which will cause leakage. The rotor suspension injection molding preparation process includes steps S1, placing the assembled rotor in the injection mold; S2, suspending the rotor in the injection mold after power is applied to the plastic mold, and closing the plastic mold; S3, injecting molten material into the injection mold, and injection molding into a seamless shielding sleeve, which completely surrounds the rotor. The present invention forms a seamless shielding sleeve by filling the suspension space surrounding the rotor, so that the shielding sleeve has a better sealing effect.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding, and in particular relates to a rotor suspension injection molding preparation process and an injection mold. Background Art

[0002] Magnetic pumps generally use corrosion-resistant, high-strength plastic materials as materials for manufacturing rotor or stator shielding sleeves, so they have good corrosion resistance and can pump acid, alkali, oil, rare and precious liquids, poison, volatile liquids, etc. They are generally used in corrosion-resistant or leak-proof fields such as chemical, pharmaceutical, petroleum, and electroplating.

[0003] In order to protect the magnetic steel from contact with the liquid in the pump and corrosion, an inner rotor magnetic pump with application number 202411056671X surrounds the stator body or rotor body by injection molding to form a shielding sleeve to block contact with the liquid in the pump. However, in the prior art, in order to completely cover the outer periphery of the stator body or rotor body, secondary injection molding is required, wherein the rotor body includes a magnetic steel and a yoke. The magnetic steel and the yoke are first fixed in the mold for the first time for the first injection molding to form an inner shielding sleeve, and the inner shielding sleeve can only half surround the magnetic steel and the yoke; then the cooled inner shielding sleeve and the magnetic steel and the yoke are fixed for the second time and then the second injection molding is performed to form an outer shielding sleeve. The inner shielding sleeve and the outer shielding sleeve form a shielding jacket that completely covers the magnetic steel and the yoke to block corrosive liquids, but such a shielding jacket always has gaps, and long-term immersion in corrosive liquids will inevitably cause leakage, affecting the service life of the magnetic steel and the yoke. How to make a seamless and fully enclosed shielding sleeve that surrounds the magnetic steel and the yoke so that the shielding sleeve has a better sealing effect. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a rotor suspension injection molding preparation process and an injection mold.

[0005] The object of the present invention can be achieved by the following technical scheme: A rotor suspension injection molding preparation process, the rotor includes a yoke and a plurality of magnetic steels evenly distributed and fixed on the yoke, including the following steps:

[0006] S1, placing the assembled rotor in an injection mold;

[0007] S2, after power is applied to the plastic mold, the rotor is suspended in the injection mold, and the plastic mold is closed;

[0008] S3, injecting molten material into the injection mold to form a seamless shielding sleeve, wherein the shielding sleeve completely surrounds the rotor.

[0009] The rotor is suspended in a mold and the suspension space surrounding the rotor is filled to form a seamless shielding sleeve, so that the shielding sleeve has a better sealing effect.

[0010] In the above-mentioned rotor suspension injection molding preparation process, the specific method of step S2 is: temporarily fix the rotor in the injection mold through an auxiliary part, connect the suspension device in the injection mold to direct current, and after removing the auxiliary part, the rotor is suspended in the injection mold under the action of magnetic force. The auxiliary part can be an arc block, and the auxiliary part can be used to quickly put the rotor in an accurate position, and when the suspension device in the injection mold is connected to direct current, the magnetic field force generated by the suspension device supports the rotor to suspend, and then the auxiliary part is removed, so that the worker can quickly find the correct balance position of the rotor suspension, which is convenient for the molding of the shielding sleeve.

[0011] In the above-mentioned rotor suspension injection molding preparation process, step S4 is also included, after the shielding sleeve is cooled and solidified, it forms an integrated rotor assembly with the rotor, and then the power is turned off and the rotor assembly is taken out. Cooling first and then turning off the power can better form the shielding sleeve and the rotor into an integrated rotor assembly.

[0012] A rotor suspension injection mold, the injection mold comprising a front mold, a rear mold, a core mold 1 and a demolding mechanism, the rear mold having a coaxial annular cavity mounting portion and a circular cavity mounting portion, an annular wall being provided between the annular cavity mounting portion and the circular cavity mounting portion, the right end face of the annular wall being tightly abutted against the front mold, a suspension device being installed in the annular cavity mounting portion, the rear mold being further provided with a core hole, the core hole being coaxial with the circular cavity mounting portion and being interconnected, the core mold 1 passing through the core hole, the rotor being sleeved outside the core mold 1 and being located in the circular cavity mounting portion, and a gap being provided between the rotor and the core mold 1 and the circular cavity mounting portion.

[0013] In the above-mentioned rotor suspension injection mold, the suspension device includes a winding bracket, and the winding bracket is evenly fixed with a plurality of stators in the circumferential direction, the demoulding mechanism includes a push rod that can move left and right, and the rear mold is evenly distributed with a plurality of through holes around the core hole in the circumferential direction, and the push rod can be abutted against the bottom of the yoke through the through hole, and the magnetic steel and the stator are arranged in a one-to-one correspondence. Before placing the rotor, the push rod is pre-extended into the interior of the circular cavity mounting portion and is in a position where it can abut against the bottom of the yoke to be placed. The auxiliary part has an inner arc surface and an outer arc surface, and the outer arc surface of the auxiliary part can abut against the inner circumferential surface of the yoke, and the inner arc surface of the auxiliary part abuts against the outer circumferential surface of the core mold. Since the plastic mold is installed horizontally, the axis of the rotor is placed horizontally. Before the stator is energized, the rotor abuts against the auxiliary part and the push rod to quickly find the accurate position of the rotor to be suspended. After the stator is energized, the rotor is suspended by the action of magnetic force, and then the auxiliary part is removed and the push rod is returned to its position, and the mold is closed for injection molding.

[0014] In the above-mentioned rotor suspension injection mold, the bottom surface of the circular cavity mounting portion is recessed downward with a deepening groove, the through hole is directly connected to the deepening groove, the stator is connected to direct current, the push rod is returned to its position, and the right end face of the push rod is flush with the bottom surface of the deepening groove. In order to reduce the internal structure of the mold, the push rod can once again complete the ejection of the formed rotor assembly after returning to its position, and a deepening groove is set here, that is, the push rod extends into the circular cavity mounting portion to pre-fix the position of the rotor, and when the stator is powered on and the push rod returns to its position, the rotor is formed. At this time, the push rod extends into the circular cavity mounting portion again to push the rotor assembly out a certain distance. This deepening groove allows the push rod to complete two actions with only one positioning.

[0015] In the above-mentioned rotor suspension injection mold, the front mold is embedded with a core mold 2, and a fixed impeller molding cavity is formed between the core mold 2 and the front mold. The fixed impeller molding cavity is connected to the circular cavity mounting part. After molding, the shielding sleeve has a rotor fixing part and an impeller fixing part. The rotor fixing part is molded in the circular cavity mounting part, and the impeller fixing part is molded in the fixed impeller molding cavity.

[0016] In the above-mentioned rotor suspension injection mold, the middle part of the core mold 2 has a feed hole 1, the end of the core mold 1 close to the core mold 2 is provided with a plurality of feed holes 2, the feed hole 2 is connected to the feed hole 1, the core mold 2 has a plurality of protrusions protruding toward one end of the core mold 1, there is a gap between the protrusion and the yoke, the feed hole 2 and the protrusion are arranged opposite to each other, the impeller fixing part is recessed with a groove along the axis toward the rotor fixing part, and the protrusion can shape the groove. The feed hole 2 and the protrusion are arranged opposite to each other so that the pressure of the feed is sprayed on the protrusion, reducing the influence of the feed on the rotor, and then the protrusion can shape the groove, integrating resources to make the mold structure simpler.

[0017] In the above-mentioned rotor suspension injection mold, the winding bracket includes a bracket body, the bracket body is axially penetrated with a T-shaped slot, one end of the stator is adapted to be embedded in the T-shaped slot and the other end is against the annular wall, the outer side surface of the bracket body is against the outer side surface of the annular cavity mounting portion, and the left and right ends of the bracket body are respectively provided with symmetrical left and right pressing frames, the left and right pressing frames are respectively pressed against the left and right end surfaces of the stator, the left end surface of the left pressing frame is against the bottom surface of the annular cavity mounting portion, and the right end surface of the right pressing frame is against the front mold. This makes it easy to install and fix the suspension device.

[0018] In the above-mentioned rotor suspension injection mold, the injection mold also includes a mold base, the core mold 1 is fixed to the mold base, the demolding mechanism also includes a fixed plate, the push rod and the fixed plate are fixed, a spring is fixedly arranged between the fixed plate and the mold base, and a limit block is provided between the fixed plate and the rear mold.

[0019] Compared with the prior art, the technical effect of the present invention is: the rotor is suspended better and faster through the suspended injection mold and is injection molded as a whole, forming a shielding sleeve structure with no gaps that can fully surround the rotor, so that the sealing effect of the rotor assembly is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the rotor assembly of the present invention.

[0021] Figure 2 The present invention is a cross-sectional view Figure 1 .

[0022] Figure 3 It is an enlarged view of point A of the present invention.

[0023] Figure 4 It is a three-dimensional diagram of the rear mold of the present invention.

[0024] Figure 5 The present invention is a cross-sectional view Figure 2 .

[0025] Figure 6 It is an exploded view of the suspension device of the present invention.

[0026] Figure 7 It is a three-dimensional diagram of the core mold 2 of the present invention.

[0027] Figure number marking: 1. rotor assembly; 101. rotor; 101a. yoke; 101b. magnet; 102. shielding sleeve; 102a. rotor fixing part; 102b. impeller fixing part; 102c. groove; 2. suspension device; 201. winding bracket; 201a. bracket body; 201b. left pressure frame; 201c. right pressure frame; 202. stator; 3. front mold; 4. rear mold; 401. Annular cavity mounting part; 402, circular cavity mounting part; 403, annular wall; 404, core hole; 405, through hole; 406, deepened groove; 5, core mold one; 501, feed hole two; 6, demoulding mechanism; 601, ejector rod; 602, fixed plate; 603, spring; 604, limit block; 7, core mold two; 701, fixed impeller molding cavity; 702, feed hole one; 703, protrusion; 8, mold base. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] It should be noted that the descriptions of the present invention regarding directions such as “up”, “down”, “left”, “right”, “top” and “bottom” are all defined based on the relationships between the orientations or positions shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] like Figures 1 to 7 As shown, a rotor suspension injection molding preparation process, the rotor 101 includes a yoke 101a and a plurality of magnetic steels 101b evenly distributed and fixed on the yoke 101a, including the following steps:

[0031] S1, placing the assembled rotor 101 in an injection mold;

[0032] S2, after the plastic mold is energized, the rotor 101 is suspended in the injection mold, and the plastic mold is closed;

[0033] S3 , injecting molten material into the injection mold to form a seamless shielding sleeve 102 , which completely surrounds the rotor 101 .

[0034] Step S4, after the shielding sleeve 102 is cooled and solidified, it forms an integrated rotor assembly 1 with the rotor 101, and then the power is turned off and the rotor assembly 1 is taken out.

[0035] In order to cover the outer periphery of the rotor 101 without gaps, the rotor 101 is suspended in the mold, and the suspension space surrounding the rotor 101 is filled to form a seamless shielding sleeve 102, so that the shielding sleeve 102 has a better sealing effect. The original two-shot injection molding operation steps are simplified, and the sealing performance of the rotor assembly 1 is improved, so that the rotor assembly 1 has a longer service life in the magnetic pump.

[0036] Furthermore, the specific method of step S2 is: temporarily fix the rotor 101 in the injection mold through an auxiliary part, connect the suspension device 2 in the injection mold to direct current, and after removing the auxiliary part, the rotor 101 is suspended in the injection mold under the action of magnetic force. The auxiliary part can be an arc block, and the rotor 101 can be quickly placed in an accurate position through the auxiliary part. When the suspension device 2 in the injection mold is connected to direct current, the magnetic force generated by the suspension device 2 supports the rotor 101 to suspend, and then the auxiliary part is removed, so that the worker can quickly find the correct balance position of the suspension of the rotor 101, and the shielding sleeve 102 can be better formed.

[0037] like Figures 1 to 7As shown, a rotor suspension injection mold, the injection mold includes a front mold 3, a rear mold 4, a core mold 5 and a demolding mechanism 6, the rear mold 4 has a coaxial annular cavity mounting portion 401 and a circular cavity mounting portion 402, an annular wall 403 is provided between the annular cavity mounting portion 401 and the circular cavity mounting portion 402, the right end surface of the annular wall 403 is tightly abutted against the front mold 3, a suspension device 2 is installed in the annular cavity mounting portion 401, the rear mold 4 is also provided with a core hole 404, the core hole 404 and the circular cavity mounting portion 402 are coaxial and connected to each other, the core mold 5 passes through the core hole 404, the rotor 101 is sleeved outside the core mold 5 and is located in the circular cavity mounting portion 402, and there is a gap between the rotor 101 and the core mold 5 and the circular cavity mounting portion 402.

[0038] Further, the suspension device 2 includes a winding bracket 201, and the winding bracket 201 is evenly fixed with a plurality of stators 202 in the circumferential direction. The winding bracket 201 includes a bracket body 201a, and the bracket body 201a is axially penetrated with a T-shaped slot. One end of the stator 202 is adapted to be embedded in the T-shaped slot and the other end is against the annular wall 403. The outer side surface of the bracket body 201a is against the outer side surface of the annular cavity mounting portion 401. The left and right ends of the bracket body 201a are respectively provided with symmetrical left and right pressing frames 201b and 201c. The left and right pressing frames 201b and 201c are respectively pressed against the left and right end surfaces of the stator 202. The left end surface of the left pressing frame 201b is against the bottom surface of the annular cavity mounting portion 401, and the right end surface of the right pressing frame 201c is against the front mold 3. The stator 202 includes an iron core and a winding wound on the iron core.

[0039] Furthermore, the injection mold also includes a mold base 8, the core mold 15 is fixed to the mold base 8, and the demoulding mechanism 6 also includes a fixed plate 602 and a push rod 601. The push rod 601 is fixed to the fixed plate 602, a spring 603 is fixedly arranged between the fixed plate 602 and the mold base 8, and a limit block 604 is provided between the fixed plate 602 and the rear mold 4. The demoulding mechanism 6 includes a push rod 601 that can move left and right, and the rear mold 4 is circumferentially evenly distributed with a plurality of through holes 405 around the core hole 404. The push rod 601 passes through the through holes 405 and can abut against the bottom of the yoke 101a, and the magnetic steel 101b is arranged in a one-to-one correspondence with the stator 202. Before placing the rotor 101, the push rod 601 is pre-extended into the interior of the circular cavity mounting portion 402 and is in a position where it can abut against the bottom of the yoke 101a to be placed. The auxiliary part has an inner arc surface and an outer arc surface. The outer arc surface of the auxiliary part can abut against the inner peripheral surface of the yoke 101a, and the inner arc surface of the auxiliary part abuts against the outer peripheral surface of the core mold 15. Since the plastic mold is installed horizontally, the axis of the rotor 101 is placed horizontally. Before the stator 202 is powered on, the rotor 101 abuts against the auxiliary part and the push rod 601 to quickly find the accurate position of the rotor 101 to be suspended. After the stator 202 is powered on, the rotor 101 is suspended by the magnetic force, and then the auxiliary part is removed and the push rod 601 is returned to its position, and the mold is closed for injection molding to form a shielding sleeve 102 with uniform wall thickness, so that it has better sealing performance.

[0040] Furthermore, a deepening groove 406 is recessed downward on the bottom surface of the circular cavity mounting portion 402, and the through hole 405 directly passes through the deepening groove 406. When the stator 202 is connected to direct current, the push rod 601 will return to its position. The right end surface of the push rod 601 after returning to its position is flush with the bottom surface of the deepening groove 406. In order to reduce the internal structure of the mold and enable the push rod 601 to once again complete the ejection of the formed rotor assembly 1 after returning to its position, a deepening groove 406 is provided here, that is, the push rod 601 extends into the circular cavity mounting portion 402 to pre-fix the position of the rotor 101, and when the stator 202 is powered on and the push rod 601 returns to its position, the rotor 101 is formed. At this time, the push rod 601 extends into the circular cavity mounting portion 402 again against the rotor assembly 1 to eject the rotor assembly 1 a certain distance. This deepening groove 406 allows the push rod 601 to complete two actions with only one positioning.

[0041] Furthermore, a core mold 2 7 is embedded in the front mold 3, and a fixed impeller molding cavity 701 is formed between the core mold 2 7 and the front mold 3. The fixed impeller molding cavity 701 is connected to the circular cavity mounting portion 402. After molding, the shielding sleeve 102 has a rotor fixing portion 102a and an impeller fixing portion 102b. The rotor fixing portion 102a is molded in the circular cavity mounting portion 402, and the impeller fixing portion 102b is molded in the fixed impeller molding cavity 701. The middle of the core mold 2 7 has a feed hole 1 702, and the end of the core mold 1 5 near the core mold 2 7 is provided with a plurality of feed holes 2 501, and the feed holes 2 501 are connected to the feed hole 1 702. The core mold 2 7 has a plurality of protrusions 703 protruding toward one end of the core mold 1 5, and there is a gap between the protrusions 703 and the yoke 101a. The feed hole 2 501 and the protrusions 703 are arranged opposite to each other, and the impeller fixing part 102b is recessed with a groove 102c along the axis toward the rotor fixing part 102a, and the protrusions 703 can shape the groove 102c. The feed hole 2 501 and the protrusions 703 are arranged opposite to each other so that the pressure of the feed is sprayed on the protrusions 703, reducing the influence of the feed on the rotor 101, and then the protrusions 703 can shape the groove 102c, and the resources are integrated to make the mold structure simpler.

[0042] The magnetic steel 101b in the rotor 101 is embedded in the yoke 101a in advance by means of glue fixation or anchor point fixation; the plastic mold is adjusted so that the push rod 601 is in the circular cavity mounting portion 402 of the plastic mold, and the height of the push rod 601 is just the distance between the yoke 101a and the deepened groove 406; the rotor 101 is then placed in the circular cavity mounting portion 402 through an auxiliary part, one end of the rotor 101 is against the push rod 601 to position the circumferential distance, and the inner circumference of the rotor 101 is positioned at a radial distance through the auxiliary part; then direct current is passed through the stator 202, and the rotor 101 is suspended in the circular cavity mounting portion 402 due to the magnetic force of the stator 202; then the push rod 601 is withdrawn and the auxiliary part is removed; the mold is closed for injection molding; after the injection-molded shielding sleeve 102 is cooled and solidified, it forms an integrated rotor assembly 1 with the rotor 101, and then the power is turned off and the rotor assembly 1 is taken out.

[0043] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A rotor suspension injection molding preparation process, wherein the rotor (101) comprises a yoke (101a) and a plurality of magnetic steels (101b) evenly distributed and embedded and fixed on the yoke (101a) around the circumference, characterized in that: The following steps are involved: S1, placing the assembled rotor (101) in an injection mold; S2, after power is applied to the plastic mold, the rotor (101) is suspended in the injection mold, and the plastic mold is closed; S3, injecting molten material into the injection mold to form a seamless shielding sleeve (102), wherein the shielding sleeve (102) completely surrounds the rotor (101); The injection mold comprises a front mold (3), a rear mold (4), a core mold 1 (5) and a demoulding mechanism (6); the rear mold (4) has a coaxial annular cavity mounting portion (401) and a circular cavity mounting portion (402); an annular wall (403) is provided between the annular cavity mounting portion (401) and the circular cavity mounting portion (402); the right end surface of the annular wall (403) is tightly abutted against the front mold (3); a suspension device (2) is installed in the annular cavity mounting portion (401); the rear mold (4) is also provided with a core hole (404); the core hole (404) and the circular cavity mounting portion (402) are coaxial and communicated with each other; the core mold 1 (5) passes through the core hole (404); the rotor (101) is sleeved outside the core mold 1 (5) and is located in the circular cavity mounting portion (402); and there is a gap between the rotor (101) and the core mold 1 (5) and the circular cavity mounting portion (402); The front mold (3) is embedded with a second core mold (7), and a fixed impeller molding cavity (701) is formed between the second core mold (7) and the front mold (3), and the fixed impeller molding cavity (701) is connected to the circular cavity mounting portion (402). After molding, the shielding sleeve (102) has a rotor fixing portion (102a) and an impeller fixing portion (102b), and the rotor fixing portion (102a) is molded in the circular cavity mounting portion (402), and the impeller fixing portion (102b) is molded in the fixed impeller molding cavity (701).

2. A rotor suspension injection molding preparation process according to claim 1, characterized in that: The specific method of step S2 is: temporarily fixing the rotor (101) in the injection mold through auxiliary parts, connecting the suspension device (2) in the injection mold to direct current, and after removing the auxiliary parts, the rotor (101) is suspended in the injection mold under the action of magnetic force.

3. A rotor suspension injection molding preparation process according to claim 2, characterized in that: The method further comprises step S4, wherein after the shielding sleeve (102) is cooled and solidified, the shielding sleeve (102) and the rotor (101) are integrated into a rotor assembly (1), and then the power is turned off and the rotor assembly (1) is removed.

4. The rotor suspension injection mold according to claim 1, characterized in that: The suspension device (2) comprises a winding bracket (201), the winding bracket (201) is evenly and circumferentially fixed with a plurality of stators (202), the demoulding mechanism (6) comprises a push rod (601) that can move left and right, the rear mold (4) is evenly and circumferentially distributed with a plurality of through holes (405) around the core hole (404), the push rod (601) passes through the through holes (405) and can abut against the bottom of the yoke (101a), and the magnetic steel (101b) and the stator (202) are arranged in a one-to-one correspondence with each other.

5. A rotor suspension injection mold according to claim 4, characterized in that: The bottom surface of the circular cavity mounting portion (402) is recessed downward to form a deepened groove (406), the through hole (405) directly passes through the deepened groove (406), the stator (202) is connected to direct current, the push rod (601) returns to its original position, and the right end surface of the push rod (601) is flush with the bottom surface of the deepened groove (406).

6. The rotor suspension injection mold according to claim 1, characterized in that: The core mold 2 (7) has a feed hole 1 (702) in the middle, and the core mold 1 (5) is provided with a plurality of feed holes 2 (501) at the end close to the core mold 2 (7), and the feed hole 2 (501) is connected to the feed hole 1 (702). The core mold 2 (7) has a plurality of protrusions (703) protruding toward one end of the core mold 1 (5), and there is a gap between the protrusions (703) and the yoke (101a), and the feed hole 2 (501) and the protrusions (703) are arranged opposite to each other, and the impeller fixing part (102b) is recessed with a groove (102c) along the axis toward the rotor fixing part (102a), and the protrusions (703) can shape the groove (102c).

7. The rotor suspension injection mold according to claim 4, characterized in that: The winding bracket (201) comprises a bracket body (201a), the bracket body (201a) is axially penetrated by a T-shaped slot, one end of the stator (202) is adapted to be embedded in the T-shaped slot and the other end is against the annular wall (403), the outer side surface of the bracket body (201a) is against the outer side surface of the annular cavity mounting portion (401), and the left and right end portions of the bracket body (201a) are respectively provided with symmetrical left pressing frames (201b) and right pressing frames (201c), the left pressing frames (201b) and right pressing frames (201c) are respectively pressed against the left and right end surfaces of the stator (202), the left end surface of the left pressing frame (201b) is against the bottom surface of the annular cavity mounting portion (401), and the right end surface of the right pressing frame (201c) is against the front mold (3).

8. The rotor suspension injection mold according to claim 4, characterized in that: The injection mold further comprises a mold base (8), the core mold 1 (5) is fixed to the mold base (8), the demoulding mechanism (6) further comprises a fixed plate (602), the ejector rod (601) and the fixed plate (602) are fixed, a spring (603) is fixedly arranged between the fixed plate (602) and the mold base (8), and a limit block (604) is provided between the fixed plate (602) and the rear mold (4).

Images