Mold for producing plastic-coated roller bearing retainer and working method

Abstract

The invention provides a mold for producing a plastic-coated roller bearing retainer and a working method. The mold comprises an upper base, an upper mold seat, a lower mold seat, a lower base and a base which are sequentially arranged from top to bottom, two mold cavities are formed between an upper mold core arranged in the upper mold base and a lower mold core arranged in the lower mold base, first mold inner cores and second mold inner cores are arranged in the mold cavities, the number of the first mold inner cores is two, and the two first mold inner cores are arranged on the two sides of the interior of a cage pocket respectively. The first mold inner cores are of a trapezoidal block structure and are arranged between the two first mold inner cores, the second mold inner cores in the adjacent pockets of the retainer are distributed in a mutually inverted mode, and the wide bottom face of a trapezoidal block is fixedly connected with an inner core driving block. And the inner core driving blocks above and below the upper mold core and the lower mold core are fixedly connected with the upper base and the lower base respectively. The problem that an existing injection mold cannot meet the requirement that adjacent pockets of a retainer are pulled away from an inner core in the opposite direction at the same time is solved.

Description

Technical Field

[0001] This invention belongs to the field of bearing mold technology, specifically relating to a mold and working method for producing plastic-coated roller bearing cages. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] In the field of rolling bearing manufacturing, the cage, as a key component, directly affects the bearing's performance, load-bearing capacity, and service life due to its structural design and manufacturing precision. Traditional rolling bearing cages typically have pockets designed for loading rolling elements from a single direction. This structure, limited by installation space and wall thickness between adjacent pockets, restricts the number of rolling elements, hindering the improvement of the bearing's radial load-bearing capacity. Furthermore, the high contact stress borne by each individual rolling element easily leads to early fatigue failure under long-term operation, limiting the bearing's application under high-load, long-life conditions. To overcome these problems, a novel cage structure with alternating rolling element installation on both sides allows for loading rolling elements from both the top and bottom of the cage, thus enabling a greater number of rolling elements to be arranged within the same bearing installation space.

[0004] However, existing mold core pulling mechanisms are usually unidirectional and cannot meet the requirement of simultaneously handling the adjacent pockets of the cage with alternating double-sided pocket structures, which require the core to be pulled out from opposite directions. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a mold and operating method for producing plastic-coated roller bearing cages, solving the problem that existing injection molds cannot meet the requirement of simultaneously processing the adjacent pockets of the cage with alternating double-sided pocket structures to extract the inner core from opposite directions.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides a mold for producing plastic-coated roller bearing cages, comprising: an upper base, an upper mold base, a lower mold base, a lower base, and a base arranged sequentially from top to bottom; a demolding drive plate is disposed in the base, and the demolding drive plate is linked to the lower mold base and the lower base respectively through a limiting mechanism and an elastic component; an upper mold core is disposed in the upper mold base, and a lower mold core is disposed in the lower mold base; two mold cavities are disposed in the upper mold core and the lower mold core, and the mold cavities are connected to the injection pipe through injection flow channels, and the mold cavities are further provided with The cage contains a first mold core and a second mold core. There are two first mold cores, which are respectively located on both sides inside the pocket of the retainer. The first mold core is a trapezoidal block structure and is arranged between the two first mold cores. The second mold cores in adjacent pockets of the retainer are arranged in reverse order. The wide bottom surface of the trapezoidal block is fixedly connected to the core driving block. The core driving block located above the upper mold core and the lower mold core is fixedly connected to the upper base, and the core driving block located below the upper mold core and the lower mold core is fixedly connected to the lower base.

[0007] As a further implementation, the upper base is fixedly connected to the upper mold base, the injection pipe passes through the upper base and the upper mold base, and an injection port is provided on the upper surface of the upper base. A cylindrical lifting drive block is provided on one side of the upper mold base, and the lifting drive block is connected to the elevator.

[0008] As a further implementation, a plurality of positioning blocks are provided between the upper mold base and the lower mold base, and the positioning blocks are arranged along the edges of the upper mold base and the lower mold base.

[0009] As a further implementation, the lower base and the base are connected by a fixing component, and the lower mold base, the upper mold base and the lower base are connected by guide posts.

[0010] As a further implementation, the limiting mechanism comprises a limiting track, a limiting block, and a limiting sliding rod. The limiting track is fixedly mounted on the side wall of the lower base and is arranged with the lower mold base and the side of the lower base. The limiting block is fixedly mounted on the side wall of the lower mold base. The limiting track has a U-shaped cross-section and limiting grooves are provided on both side walls of the limiting track. The limiting block can reciprocate within the limiting grooves. The bottom end of the limiting sliding rod is fixedly connected to the demolding drive plate, and the top end is inserted into the U-shaped groove of the U-shaped structure.

[0011] As a further implementation, the elastic component includes a spring and a spring guide rod, the bottom ends of which are fixedly mounted on the demolding drive plate. The spring passes through the lower base and abuts against the bottom surface of the lower mold base, and the spring has a set preload force. The spring guide rod passes through the lower base and is inserted into the lower mold base.

[0012] As a further implementation, a drive through hole is provided at the center of the base, the drive through hole is used to install a hydraulic telescopic rod, and the hydraulic telescopic rod abuts against the demolding drive plate.

[0013] As a further implementation, a push rod is fixedly provided on the upper surface of the demolding drive plate, and the top of the push rod abuts against the retainer to push the retainer to disengage from the lower mold core.

[0014] As a further implementation, hot and cold pipes are provided in the upper base, upper mold base, lower mold base, lower base, upper mold core and lower mold core, and the hot and cold pipes are connected to the mold cooling machine.

[0015] Secondly, the present invention also provides a method for using a mold to produce a plastic-coated roller bearing cage, comprising the following steps: Step 1: After the mold is closed, the mold cooling machine injects hot water at the set temperature into the hot and cold pipes to preheat the upper mold core and the lower mold core to the set temperature; Step 2: Inject fluid-type injection molding material into the mold cavity using an injection molding machine until the injection pressure of the injection molding machine increases, at which point the injection molding machine stops injection. Step 3: After injection molding is completed, the mold cooling machine injects water at a set room temperature into the hot and cold pipes to cool the upper and lower mold cores, thereby rapidly cooling the injection molded material. Step 4: The elevator drives the upper mold base to move upward through the lifting drive block. At this time, the upper base drives the inner core drive block above the upper mold core and the second mold inner core fixedly connected to the inner core drive block to move upward. The two adjacent first mold inner cores move relative to each other by a set distance. Step 5: The lower mold base moves upward by a set distance, which is equal to the distance the limiting block moves in the limiting groove. Under the action of the spring, the lower mold base separates from the lower base. At this time, when the lower mold base moves upward, the inner core driving block below the lower mold core and the second mold inner core fixedly connected to the inner core driving block remain stationary. The two adjacent first mold inner cores move upward and move relative to each other by a set distance, so as to achieve complete separation of the first mold inner core and the second mold inner core from the retainer. Step Six: The hydraulic telescopic rod pushes the demolding drive plate, which in turn pushes the retainer to separate from the lower mold core via the push rod, completing the retainer injection molding.

[0016] Compared with the prior art, the advantages and positive effects of this invention are: The present invention provides two mold cavities between the upper mold core in the upper mold base and the lower mold core in the lower mold base. The mold cavities are connected to the injection pipe through the injection flow channel. The mold cavities also contain a first mold core and a second mold core. The two first mold cores are respectively located on both sides inside the cage pocket. The first mold core has a trapezoidal block structure and is arranged between the two first mold cores. The second mold cores in adjacent pockets of the cage are arranged in an inverted manner, that is, the wide bottom surface of the second mold core in one pocket faces upward and the wide bottom surface of the second mold core in adjacent pockets faces downward. This forms a pocket structure that allows rolling elements to be alternately installed from both sides of the cage, thereby ensuring that the cage can accommodate a larger number of rolling elements with the same bearing inner and outer ring dimensions. The increased number of rolling elements allows the load to be distributed across more contact points, significantly improving the radial load capacity of the bearing and reducing the contact stress of each rolling element, thus helping to extend the bearing's fatigue life. The wide bottom surface of the trapezoidal block is fixedly connected to the inner core drive block. The inner core drive block located above the upper and lower mold cores is fixedly connected to the upper base, and the inner core drive block located below the upper and lower mold cores is fixedly connected to the lower base. A pull plate is provided on the narrow bottom surface of the second mold inner core. The middle part of the pull plate is elastically connected to the second mold inner core, and both ends of the pull plate are slidably connected to the grooves on the surface of the first mold inner core. This allows the first mold inner core to retract and move when the second mold inner core is pulled, thus achieving separation from the cage. By setting a trapezoidal second mold core, the mold in the cage pocket can be removed. By setting the second mold cores in adjacent pockets of the cage to be inverted, the molds in adjacent pockets can be removed above and below the upper and lower mold cores. By removing the molds above and below the cage, the mold cores of adjacent pockets are pulled out from opposite directions, thereby forming a pocket structure from which rolling elements can be alternately installed on both sides of the cage.

[0017] The limiting track of this invention is fixedly installed on the side wall of the lower base, and the lower mold seat and the side of the lower base are arranged thereon. The limiting block is fixedly installed on the side wall of the lower mold seat. Limiting grooves are provided on both side walls of the limiting track. The limiting block can reciprocate in the limiting grooves. The movement of the limiting block in the limiting grooves allows the lower mold seat to move relative to the lower base. The spring passes through the lower base and abuts against the bottom surface of the lower mold seat. The spring has a set preload. The spring guide rod passes through the lower base and is inserted into the lower mold seat. The lower mold seat moves upward by a set distance. This distance is related to the limiting track. The blocks move equal distances within the limiting grooves. Under the action of the spring, the lower mold base separates from the lower base, causing the inner core drive block below the lower mold core and the second mold core fixedly connected to the inner core drive block to disengage from the retainer. The bottom end of the limiting sliding rod is fixedly connected to the demolding drive plate, and its top end is inserted into the U-shaped groove of the U-shaped structure, allowing the demolding drive plate to move during its up-and-down movement. The hydraulic telescopic rod abuts against the demolding drive plate, and a push rod is fixedly installed on the upper surface of the demolding drive plate. The top of the push rod abuts against the retainer, used to push the retainer away from the lower mold core. The hydraulic telescopic rod is used to push the demolding drive plate upwards, thereby causing the push rod to push the retainer out of the lower mold core. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] Figure 1 This is a schematic diagram of the overall mold structure for the plastic-coated roller bearing cage of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure between the mold core and the cage of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure between the mold core and the cage in this invention.

[0022] Figure 4 This is a schematic diagram of the structure between the push rod and the cage of the present invention.

[0023] Figure 5 This is a schematic diagram of the limiting mechanism structure of the present invention.

[0024] In the diagram: 1. Upper mold base; 2. Lower mold base; 3. Upper base; 4. Lower base; 5. Base; 6. Positioning block; 7. Limiting mechanism; 8. Elastic component; 9. Demolding drive plate; 10. Injection pipe; 11. Lower mold core; 12. First mold inner core; 13. Cage; 14. Second mold inner core; 15. Inner core drive block; 16. Injection runner; 17. Upper mold core; 18. Ejector rod; 19. Fixing component; 20. Limiting rail; 21. Trapezoidal block; 22. Limiting sliding rod. Detailed Implementation

[0025] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. Example 1 This embodiment provides a mold for producing plastic-coated roller bearing cages, such as... Figures 1-5As shown, it includes: an upper base 3, an upper mold base 1, a lower mold base 2, a lower base 4, and a base 5 arranged sequentially from top to bottom; a demolding drive plate 9 is provided in the base 5, and the demolding drive plate 9 is linked with the lower mold base 2 and the lower base 4 respectively through a limiting mechanism 7 and an elastic component 8; an upper mold core 17 is provided in the upper mold base 1, and a lower mold core 11 is provided in the lower mold base 2; two mold cavities are provided in the upper mold core 17 and the lower mold core 11, and the mold cavities are connected to the injection pipe 10 through an injection flow channel 16. A first mold inner core 12 and a second mold inner core 14 are also provided in the mold cavities. There are two first mold inner cores 12, which are respectively arranged on both sides inside the pocket of the retainer 13. The first mold inner core 12 has a trapezoidal block 21 structure and is arranged between the two first mold inner cores 12. The second mold cores 14 in adjacent pockets of the retainer 13 are arranged in an inverted manner, that is, the wide bottom surface of one pocket of the second mold core 14 faces upward, and the wide bottom surface of the adjacent pocket faces downward. The wide bottom surface of the trapezoidal block 21 is fixedly connected to the core driving block 15. The core driving block 15 located above the upper mold core 17 and the lower mold core 11 is fixedly connected to the upper base 3, and the core driving block 15 located below the upper mold core 17 and the lower mold core 11 is fixedly connected to the lower base 4. A pull plate is provided on the narrow bottom surface of the second mold core 14. The middle part of the pull plate is elastically connected to the second mold core 14, and the two ends of the pull plate are slidably connected to the sliding grooves on the surface of the first mold core 12, so that when the second mold core 14 is pulled, the first mold core 12 can be moved to retract and move, thereby disengaging from the retainer 13. By setting a trapezoidal second mold core 14, the mold in the pocket of the retainer 13 can be removed. By setting the second mold cores 14 in adjacent pockets of the retainer 13 to be inverted, the molds in adjacent pockets can be removed above and below the upper mold core 17 and the lower mold core 11. By removing the molds above and below the retainer 13, the mold cores of adjacent pockets are pulled out from opposite directions, thereby forming a pocket structure in which rolling elements can be alternately installed from both sides of the retainer 13.

[0027] As a further implementation, the upper base 3 is fixedly connected to the upper mold base 1, the injection pipe 10 passes through the upper base 3 and the upper mold base 1, and an injection port is provided on the upper surface of the upper base 3. A cylindrical lifting drive block is provided on one side of the upper mold base 1. The lifting drive block is connected to the elevator. The injection material can smoothly enter the mold cavity through the upper injection port. The elevator drives the lifting drive block to move the upper mold base 1 up and down, thereby realizing mold opening.

[0028] As a further implementation, a plurality of positioning blocks 6 are provided between the upper mold base 1 and the lower mold base 2. The positioning blocks 6 are arranged along the edges of the upper mold base 1 and the lower mold base 2. By setting the positioning blocks 6, accurate docking between the upper mold base 1 and the lower mold base 2 is achieved, thereby ensuring that the mold cavity of the retainer 13 can be injection molded to the standard size of the retainer 13.

[0029] As a further implementation, the lower base 4 and the base 5 are connected by a fixing component 19, and the lower mold base 2, the upper mold base 1 and the lower base 4 are connected by guide posts, so that the lower mold base 2 can move relative to the lower base 4 under the action of the elastic component 8, and ensure that the lower mold base 2, the upper mold base 1 and the lower base 4 are aligned after repeated movement.

[0030] As a further implementation, the limiting mechanism 7 consists of a limiting track 20, a limiting block, and a limiting sliding rod 22. The limiting track 20 is fixedly installed on the side wall of the lower base 4 and the lower mold base 2 is arranged on the side of the lower base 4. The limiting block is fixedly installed on the side wall of the lower mold base 2. The limiting track 20 has a U-shaped cross-section. Limiting grooves are provided on both side walls of the limiting track 20. The limiting block can reciprocate in the limiting groove. By moving the limiting block in the limiting groove, the lower mold base 2 can move relative to the lower base 4, so that the inner core driving block 15 below the lower mold core 11 and the second mold inner core 14 fixedly connected to the inner core driving block 15 are disengaged from the retainer 13. The bottom end of the limiting sliding rod 22 is fixedly connected to the demolding drive plate 9, and the top end is inserted into the U-shaped groove of the U-shaped structure, so that the demolding drive plate 9 moves with high accuracy during up and down movement.

[0031] As a further implementation, the elastic component 8 includes a spring and a spring guide rod. The bottom ends of the spring and the spring guide rod are fixedly mounted on the demolding drive plate 9. The spring passes through the lower base 4 and abuts against the bottom surface of the lower mold base 2. The spring has a set preload force. The spring guide rod passes through the lower base 4 and is inserted into the lower mold base 2. The lower mold base 2 moves upward by a set distance, which is equal to the distance the limiting block moves in the limiting groove. The lower mold base 2 separates from the lower base 4 under the action of the spring.

[0032] As a further implementation, a drive through hole is provided at the center of the base 5 for installing a hydraulic telescopic rod. The hydraulic telescopic rod abuts against the demolding drive plate 9. A push rod 18 is fixedly installed on the upper surface of the demolding drive plate 9, and the top of the push rod 18 abuts against the retainer 13, for pushing the retainer 13 to disengage from the lower mold core 11. The hydraulic telescopic rod is used to push the demolding drive plate 9 upward, thereby causing the push rod 18 to push the retainer 13 out of the lower mold core 11.

[0033] As a further implementation, hot and cold pipes are provided in the upper base 3, upper mold base 1, lower mold base 2, lower base 4, upper mold core 17 and lower mold core 11. The hot and cold pipes are connected to the mold cooling machine and are used to inject hot water or other hot media in the early stage of injection molding to preheat the upper mold core 17 and lower mold core 11 to the set temperature. After injection molding is completed, cold water or other cold media are injected through the mold cooling machine to cool the upper mold core 17 and lower mold core 11, thereby enabling the injection molding material to cool down quickly.

[0034] Example 2 This embodiment provides a method for producing a mold for manufacturing a plastic-coated roller bearing cage 13, including the following steps: Step 1: After the mold is closed, the mold cooling machine injects hot water at the set temperature into the hot and cold pipes to preheat the upper mold core 17 and the lower mold core 11 to the set temperature. Step 2: Inject fluid-type injection molding material into the mold cavity using an injection molding machine until the injection pressure of the injection molding machine increases, at which point the injection molding machine stops injection. Step 3: After injection molding is completed, the mold cooling machine injects water at a set room temperature into the hot and cold pipes to cool down the upper mold core 17 and the lower mold core 11, thereby rapidly cooling the injection molding material. Step 4: The elevator drives the upper mold base 1 to move upward through the lifting drive block. At this time, the upper base 3 drives the inner core drive block 15 above the upper mold core 17 and the second mold inner core 14 fixedly connected to the inner core drive block 15 to move upward. The two adjacent first mold inner cores 12 move relative to each other by a set distance. Step 5: The lower mold base 2 moves upward by a set distance, which is equal to the distance that the trapezoidal block 21 moves in the limiting groove. Under the action of the spring, the lower mold base 2 separates from the lower base 4. At this time, when the lower mold base 2 moves upward, the inner core driving block 15 below the lower mold core 11 and the second mold inner core 14 fixedly connected to the inner core driving block 15 remain stationary. The two adjacent first mold inner cores 12 move upward and move relative to each other by a set distance, so as to achieve complete separation of the first mold inner core 12 and the second mold inner core 14 from the retainer 13. Step 6: The hydraulic telescopic rod pushes the demolding drive plate 9, and the demolding drive plate 9 pushes the retainer 13 to separate from the lower mold core 11 through the push rod 18, thus completing the injection molding of the retainer 13.

[0035] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A mold for producing plastic-coated roller bearing cages, characterized in that, include: The following components are arranged sequentially from top to bottom: an upper base, an upper mold base, a lower mold base, a lower base, and a base. A demolding drive plate is provided in the base, and the demolding drive plate is linked to the lower mold base and the lower base respectively through a limiting mechanism and an elastic component. An upper mold core is provided in the upper mold base, and a lower mold core is provided in the lower mold base. Two mold cavities are provided in the upper and lower mold cores, and these cavities are connected to the injection pipe through injection channels. A first mold inner core and a second mold inner core are also provided in each mold cavity. There are two first mold inner cores, respectively located on both sides inside the retainer pockets. Each first mold inner core has a trapezoidal block structure and is arranged between two first mold inner cores. The second mold inner cores in adjacent pockets of the retainer are arranged in an inverted configuration. The wide bottom surface of the trapezoidal block is fixedly connected to an inner core drive block. The inner core drive block located above the upper and lower mold cores is fixedly connected to the upper base, and the inner core drive block located below the upper and lower mold cores is fixedly connected to the lower base.

2. The mold for producing a plastic-coated roller bearing cage as described in claim 1, characterized in that, The upper base is fixedly connected to the upper mold base. The injection pipe passes through the upper base and the upper mold base, and an injection port is provided on the upper surface of the upper base. A cylindrical lifting drive block is provided on one side of the upper mold base, and the lifting drive block is connected to the lifting machine.

3. The mold for producing a plastic-coated roller bearing cage as described in claim 2, characterized in that, Multiple positioning blocks are provided between the upper mold base and the lower mold base, and the positioning blocks are arranged along the edges of the upper mold base and the lower mold base.

4. The mold for producing a plastic-coated roller bearing cage as described in claim 3, characterized in that, The lower base and the base are connected by a fixing component, and the lower mold base, the upper mold base and the lower base are connected by guide posts.

5. The mold for producing a plastic-coated roller bearing cage as described in claim 4, characterized in that, The limiting mechanism consists of a limiting track, a limiting block, and a limiting sliding rod. The limiting track is fixedly installed on the side wall of the lower base and is arranged with the lower mold base and the side of the lower base. The limiting block is fixedly installed on the side wall of the lower mold base. The limiting track has a U-shaped cross-section and limiting grooves are provided on both side walls of the limiting track. The limiting block can reciprocate in the limiting grooves. The bottom end of the limiting sliding rod is fixedly connected to the demolding drive plate, and the top end is inserted into the U-shaped groove of the U-shaped structure.

6. The mold for producing a plastic-coated roller bearing cage as described in claim 4, characterized in that, The elastic component includes a spring and a spring guide rod. The bottom ends of the spring and the spring guide rod are fixedly mounted on the demolding drive plate. The spring passes through the lower base and abuts against the bottom surface of the lower mold base. The spring has a set preload force. The spring guide rod passes through the lower base and is inserted into the lower mold base.

7. The mold for producing a plastic-coated roller bearing cage as described in claim 6, characterized in that, A drive through hole is provided at the center of the base, and the drive through hole is used to install a hydraulic telescopic rod, which abuts against the demolding drive plate.

8. The mold for producing a plastic-coated roller bearing cage as described in claim 7, characterized in that, A push rod is fixedly provided on the upper surface of the demolding drive plate. The top of the push rod abuts against the retainer and is used to push the retainer to disengage from the lower mold core.

9. A mold for producing a plastic-coated roller bearing cage as described in claim 8, characterized in that, The upper base, upper mold base, lower mold base, lower base, upper mold core, and lower mold core are all equipped with hot and cold pipes, which are connected to the mold cooling machine.

10. A method for using a mold for producing a plastic-coated roller bearing cage as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: After the mold is closed, the mold cooling machine injects hot water at the set temperature into the hot and cold pipes to preheat the upper mold core and the lower mold core to the set temperature; Step 2: Inject fluid-type injection molding material into the mold cavity using an injection molding machine until the injection pressure of the injection molding machine increases, at which point the injection molding machine stops injection. Step 3: After injection molding is completed, the mold cooling machine injects water at a set room temperature into the hot and cold pipes to cool the upper and lower mold cores, thereby rapidly cooling the injection molded material. Step 4: The elevator drives the upper mold base to move upward through the lifting drive block. At this time, the upper base drives the inner core drive block above the upper mold core and the second mold inner core fixedly connected to the inner core drive block to move upward. The two adjacent first mold inner cores move relative to each other by a set distance. Step 5: The lower mold base moves upward by a set distance, which is equal to the distance the limiting block moves in the limiting groove. Under the action of the spring, the lower mold base separates from the lower base. At this time, when the lower mold base moves upward, the inner core driving block below the lower mold core and the second mold inner core fixedly connected to the inner core driving block remain stationary. The two adjacent first mold inner cores move upward and move relative to each other by a set distance, so as to achieve complete separation of the first mold inner core and the second mold inner core from the retainer. Step Six: The hydraulic telescopic rod pushes the demolding drive plate, which in turn pushes the retainer to separate from the lower mold core via the push rod, completing the retainer injection molding.

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