A mask injection mold for in-mold removal

Abstract

The present invention proposes a mask injection mold for in-mold removal, comprising an upper mold plate, a lower mold plate, a core mechanism and a core frame, wherein the core mechanism is installed on the core frame; the upper mold plate and the lower mold plate are respectively located at the upper and lower sides of the core mechanism to perform opening and closing activities; the core mechanism comprises a core assembly and an ejection assembly, wherein the core assembly comprises a large core and a small core installed on the large core; the ejection assembly comprises a first rack and a first gear that cooperate with each other; an ejection rod is provided on the inner side of the small core, wherein the ejection rod passes through the large core and is connected to the first rack, the first rack is meshed with the first gear, the first rack performs linear reciprocating activities under the drive of the first gear, and the small core moves synchronously with the first rack to perform reciprocating activities of ejection and reset. The present invention can remove parts from the mold, and utilizes the core and the ejection structure to cooperate with each other for demolding, which can reduce labor intensity, shorten operation time, and ensure product quality.

Description

Technical Field

[0001] The invention relates to a mask injection mould for taking out parts from a mould. Background Art

[0002] Gas masks are protective equipment used in special environments. They are usually composed of a main body, goggles, filters, drinking tubes, and plastic fasteners. The main part of the mask is required to have certain elasticity, softness, sealing, easy installation, chemical stability and other properties. It is generally made of rubber materials, and other parts are installed on the main body of the mask accordingly, making the shape and structural dimensions of the entire mask body more complex, and the corresponding rubber mold used is also more complex in structure. In general, the mold is opened in the ordinary way during production. After the upper and lower mold cavity plates are opened, the product is covered on the mold core. First, the active mold core is pried loose with a screwdriver, and then the active mold core covering the product is manually taken to the outside of the machine for gradual demolding. After demolding, the mold core is put back into the installation position in the mold, and then the vulcanization process of the next mold is carried out. When using this structural mold to produce the main part of the mask, it is necessary to manually pry the movable mold core loose, then take the movable mold core out of the machine to pick up the part, and then put the movable mold core back into the mold. Because the shape and structure of the mask mold core are complex and large in size and bulky, this production method is labor-intensive and easy to burn. The long operation time affects production capacity. At the same time, the movable mold core is out of the mold for too long, and the temperature of the mold core is inconsistent with the temperature of the cavity plate, which affects the quality of the vulcanized product. Sometimes, due to the complex structure of the mold, when putting the movable mold core back into the mold, it is easy to miss or put it wrong, resulting in damage to the mold and causing losses; in order to simplify the mold structure, it is sometimes necessary to simplify the mold by reducing product functions and simplifying product structure, resulting in product performance not meeting the design and use requirements. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a mask injection mold for in-mold removal. The in-mold removal and demoulding using the mold core and the ejection structure can reduce labor intensity, shorten operation time, and ensure product quality.

[0004] The present invention proposes a mask injection mold for in-mold removal, comprising an upper mold plate, a lower mold plate, a core mechanism and a core frame, wherein the core mechanism is installed on the core frame; the upper mold plate and the lower mold plate are respectively located at the upper and lower sides of the core mechanism for opening and closing activities, and the upper mold plate and the lower mold plate have cavities corresponding to the core mechanism; the core mechanism comprises a core assembly and an ejection assembly, wherein the core assembly comprises a large core and a small core installed on the large core; the ejection assembly comprises a first rack and a first gear that cooperate with each other; an ejection rod is provided on the inner side of the small core, wherein the ejection rod passes through the large core and is connected to the first rack, the first rack is meshed with the first gear, and the first rack performs a linear reciprocating motion under the drive of the rotating first gear, and the small core moves synchronously with the first rack to perform a reciprocating motion of ejection and reset.

[0005] As a further solution of the present invention, the ejection assembly also includes a second gear and a second rack, the second rack is meshed with the second gear, the second gear is connected to the first gear through a transmission belt, the second rack is driven by a cylinder to perform linear reciprocating motion, the second gear rotates under the drive of the second rack, the first gear and the second gear rotate synchronously, thereby driving the first rack to move.

[0006] As a further solution of the present invention, the mold core assembly has two sets, which are symmetrically arranged and the two large mold cores are connected as a whole. The ejector assembly is installed in the large mold core, wherein the end of the second rack is exposed outside the large mold core, and one end of the second rack is provided with a dovetail groove for connecting to the movable rod of the cylinder; the first rack has two sets, which are respectively connected to the ejector rods of the small mold cores of the two mold core assemblies, and the two first racks are respectively located on both sides of the first gear, and reciprocate in opposite directions under the drive of the first gear.

[0007] As a further solution of the present invention, the upper and lower ends of the axles of the first gear and the second gear are connected with bearings, and the bearings are installed in the installation grooves in the large mold core.

[0008] As a further solution of the present invention, the small mold core is provided with a guide rod, and the large mold core is provided with a guide hole.

[0009] As a further solution of the present invention, the core frame includes a fixed plate and top plates on both sides of the fixed plate, the core mechanism is connected to a mounting plate, and the mounting plate is connected and fixed to the fixed plate; the large core is provided with a connecting portion connected to the mounting plate, the second rack is passed through the connecting portion, a guide groove that cooperates with the second rack is provided on the connecting surface of the mounting plate and the large core, and a cylinder connecting hole for installing the cylinder is provided at one end of the mounting plate.

[0010] As a further solution of the present invention, it also includes a sliding insert, which is installed in the cavity of the upper template and the lower template, and a slide groove is provided in the cavity, and the slide groove has a groove wall that narrows and tilts toward the groove bottom, and the sliding insert is provided with a slider, and the slider has an inclined surface corresponding to the groove wall of the slide groove, the slider is installed in the slide groove, and the bottom of the slider is connected to the limit screw, the limit screw is passed from the top surface of the upper template or the bottom surface of the lower template to the slide groove and connected to the slider, the slider can move upward along the groove wall of the slide groove and the moving distance is limited by the limit screw.

[0011] As a further solution of the present invention, it also includes a movable insert, which is provided with a protrusion for manually grabbing the movable insert, and a groove corresponding to the protrusion is provided in the cavity; the groove has a groove wall that narrows and tilts toward the groove bottom, and the protrusion has an inclined surface corresponding to the groove wall.

[0012] As a further solution of the present invention, the movable insert includes a lens movable insert and a nostril movable insert, an insertion position is provided on the small mold core, and the nostril movable insert is provided with an insertion column installed in cooperation with the insertion position; a positioning hole is provided on the small mold core, and a positioning column is provided on the lens movable insert to be installed in cooperation with the fixing hole column.

[0013] As a further solution of the present invention, the lower template is provided with a guide column, the upper template is provided with a guide hole, a guide sleeve is provided in the guide hole, and when the upper template is opened and closed, the inner wall of the guide sleeve moves along the outer wall of the guide column for guidance.

[0014] Beneficial effects of the present invention:

[0015] After the mold of the present invention is opened, the mold core mechanism is ejected by the machine, and then the small mold core is ejected under the action of the ejection assembly, and the rubber mask is demolded, and the part can be taken directly from the mold without taking the mold core out of the machine or manually prying the mold core loose, which can reduce labor intensity, shorten operation time, and ensure product quality.

[0016] The product formed by the mold of the present invention is a rubber mask with a complex structure. The outer periphery of the inner surface of the mask is formed by the large mold core, and the middle part of the inner surface of the mask is formed by the small mold core. There are many inverted hook structures in this part and it cannot be directly formed on the large mold core (direct molding will result in failure to demold). Therefore, through the movable small mold core, the injection molding and vulcanization process, the small mold core and the large mold core are combined into the inner surface cavity part of the product. After the mold is opened, the machine lifts the top plate of the core frame to push the core mechanism out of the lower template cavity. Then the small mold core extends out with the rack to push it away from the large mold core. The product can be directly taken out from the small mold core, and demolding is simple.

[0017] In addition to the core mechanism, the present invention also includes a sliding insert, which is used to form a mounting buckle on the edge of the mask with the cavity. If this part of the structure is directly molded on the core, the product is prone to tearing during the demoulding process. With the setting of the sliding insert, during the demoulding process of the product, the product pulls the sliding insert to slide, and the mounting buckle part can be easily demoulded from the inner cavity of the sliding insert. The slider of the sliding insert is limited by the limiting screw, and the pulling distance is limited. After taking out the product, the sliding insert is reset along the inclined groove wall of the slide groove during the mold closing process.

[0018] The present invention also includes a movable insert. For the lens installation position and the air hole position of the mask, it is impossible to use an insert that automatically resets. Therefore, a movable insert design is adopted. When the core mechanism is ejected from the cavity, the movable insert is lifted up together with the core mechanism. The movable insert is manually removed, and then the product is removed. After the product is removed, the movable insert is manually placed in the groove corresponding to the template and reset. The movable insert moves along the groove wall through the protrusion, and the lifting is not blocked. The setting of the protrusion is convenient for manual grasping and removal. When resetting, it is guided to reset along the inclined groove wall, which is simple to operate and accurate to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the upper template of the present invention being opened.

[0021] Figure 3 It is a structural exploded view of the present invention in an inverted state.

[0022] Figure 4 It is a structural exploded view of the present invention.

[0023] Figure 5 This is a schematic diagram of opening a mold and taking out a product according to the present invention.

[0024] Figure 6 It is a structural exploded view of the core mechanism of the present invention.

[0025] Figure 7 The structural exploded view of the core mechanism of the present invention is shown without the large core.

[0026] Figure 8 It is a schematic diagram of the matching structure of the core mechanism and the core frame of the present invention.

[0027] Fig. 9 It is a schematic structural diagram of the sliding insert of the present invention.

[0028] Fig.10 It is a schematic structural diagram of the movable insert of the lens of the present invention.

[0029] Fig.11 It is a schematic structural diagram of the nostril movable insert of the present invention. DETAILED DESCRIPTION

[0030] The present application scheme is further described as follows in conjunction with the accompanying drawings:

[0031] See attached Figure 1-11 A mask injection mold for in-mold removal includes an upper mold plate 1, a lower mold plate 2, a core mechanism 3, a core frame 4, a sliding insert 5 and a movable insert 6.

[0032] The upper template 1 and the lower template 2 are respectively located at the upper and lower sides of the core mechanism 3. The upper template 1 and the lower template 2 are provided with locking grooves 10 and 20 for connecting and installing with the injection molding machine and opening and closing by the injection molding machine. The lower template 2 is provided with a guide column 21, and the upper template 1 is provided with a guide hole 11. The guide hole 11 is provided with a guide sleeve 12. When the upper template 1 is opened and closed, the inner wall of the guide sleeve 12 moves along the outer wall of the guide column 21 for guidance. The upper template 1 and the lower template 2 have cavities 13 and 23 corresponding to the core mechanism 3. The bottom of the lower template 2 is provided with a glue injection hole 22, and the bottom of the core mechanism 3 is provided with a flow channel 32 connected with the glue injection hole 22.

[0033] The core frame 4 includes a fixed plate 41 and top plates 42 on both sides of the fixed plate 41. The core mechanism 3 is connected to a mounting plate 7 by screws 31, and the mounting plate 7 is fixedly connected to the fixed plate 41 by screws 31. The top plate 42 is used to cooperate with the jacking structure of the injection molding machine to jack up the core mechanism 3. A column 24 is provided at the rear side of the lower template 2, and a column hole 74 is provided on the mounting plate 7. The mounting plate 7 is sleeved on the column 24 of the lower template 2 through the column hole 74. When the core mechanism 3 is jacked up together with the core frame 4, it moves upward along the guide of the column 24.

[0034] The core mechanism 3 includes a core assembly 8 and an ejection assembly 9 .

[0035] The mold core assembly 8 includes a large mold core 81 and a small mold core 82. The mold core assembly 8 has two sets, which are symmetrically arranged and the two large mold cores 81 are connected as a whole by screws 31. An installation cavity is formed between the two large mold cores 81, and the ejection assembly 9 is installed in the large mold core 81. The two small mold cores 82 are respectively installed on the large mold cores 81 on both sides.

[0036] The ejection assembly 9 includes a first rack 91, a first gear 92, a second gear 93 and a second rack 94 that cooperate with each other. The large mold core 81 is provided with a connecting portion 811 connected to the mounting plate 7. When installed, the connecting portion 811 is embedded in the connecting groove 71 on the mounting plate 7 and is connected and fixed by screws 31. The second rack 94 is inserted into the connecting portion 811, and the end of the second rack 94 is exposed outside the large mold core 81, and one end of the second rack 94 is provided with a dovetail groove 941 for connecting with the telescopic movable rod of the cylinder, which is driven by the cylinder to perform linear reciprocating motion. A guide groove 72 that cooperates with the second rack 94 is provided on the connecting surface of the mounting plate 7 and the large mold core 81, and a cylinder connecting hole 73 for installing the cylinder is provided at one end of the mounting plate 7. The second rack 94 is meshed with the second gear 93, and the second gear 93 rotates under the drive of the second rack 94. The second gear 93 is connected to the first gear 92 through a transmission belt 95. The upper and lower ends of the axles of the first gear 92 and the second gear 93 are connected with bearings 96. The bearings 96 are installed in the installation grooves in the large mold core 81. The first gear 92 rotates synchronously with the second gear 93. There are two first racks 91, which are respectively located on both sides of the first gear 92. The teeth of the two first racks 91 are opposite and mesh with the first gear 92 respectively. They reciprocate in opposite directions under the drive of the first gear 92 (rotating counterclockwise or clockwise). An ejector rod 821 and a guide rod 822 are provided on the inner side of the small mold core 82, and a through hole 812 for the ejector rod 821 to pass through and a guide hole 813 that cooperates with the guide rod 822 are provided on the large mold core 81. The ejector rods 821 of the two small mold cores 82 pass through the large mold core 81 on the same side and are respectively connected to the ejector rod connection holes 911 at one end of the first rack 91 (fastened and fixed by bolts 912). The small mold core 82 moves synchronously with the first rack 91 to perform reciprocating actions of ejection and reset. When the small mold core 82 moves, the guide rod 822 moves along the guide hole 813 to guide and prevent displacement during reset. In order to increase the stability of the ejector assembly 9 and the compactness of the installation, during installation, the second rack 94 is parallel to the first rack 91, and the second gear 93 and the first gear 92 are at the center position of the mold core mechanism 3 (on the symmetry axis of the two mold core assemblies 8).

[0037] There are four sliding inserts 5, which are installed in the cavities 13 and 23 of the upper template 1 and the lower template 2 in pairs. One side of the sliding insert 5 forms a molding cavity for the mounting buckle 301 (the part connected to the mask fixing belt) at the edge of the mask product 30 with the cavities 13 and 23. A slide groove 50 is provided in the cavities 13 and 23. The slide groove 50 has a groove wall that narrows and tilts toward the groove bottom. The sliding insert 5 is provided with a slider 51. The slider 51 has an inclined surface corresponding to the groove wall of the slide groove 50. The slider 51 is installed in the slide groove 50, and the bottom of the slider 51 is connected to the limit screw 52. The limit screw 52 is passed from the top surface of the upper template 1 or the bottom surface of the lower template 2 to the slide groove 50 and connected to the slider 51. The slider 51 can move up along the groove wall of the slide groove 50 and the moving distance is limited by the limit screw 52.

[0038] The movable insert 6 is provided with a protrusion 61 for manually grasping the movable insert 6, and a groove 60 corresponding to the protrusion 61 is provided in the mold cavity 13, 23; the groove 60 has a groove wall that narrows and tilts toward the groove bottom, and the protrusion 61 has an inclined surface corresponding to the groove wall of the groove 60. The movable insert 6 includes a lens movable insert 6A and a nostril movable insert 6B, a small mold core 82 is provided with an insertion position 823, and the nostril movable insert 6B is provided with an insertion column 62 that cooperates with the insertion position 823; a positioning hole 824 is provided on the small mold core 82, and a positioning column 63 that cooperates with the positioning hole column 824 is provided on the lens movable insert 6A.

[0039] During installation, first insert the small mold core 82 into the large mold core 81 to form the mold core assembly 8, and then connect and fix the first rack 91 to the ejector rod 821 of the small mold core 82. After the bearing 96 is installed at both ends of the first gear 92 and the second gear 93, the transmission belt 95 is sleeved on the first gear 92 and the second gear 93, and after assembly, it is placed in the installation groove of the large mold core 81 of one set of the mold core assembly 8, and then assembled with the other set of the mold core assembly 8 connected with the first rack 91, and the two ends of the large mold core 81 are locked with screws 31. Then, the second rack 94 is inserted into the slot hole of the connecting part 811 of the large mold core 81 and meshed with the second gear 93. After the ejector assembly 9 and the mold core assembly 8 are combined into the mold core mechanism 3, they are connected and fixed to the mounting plate 7, and then the mounting plate 7 is connected and fixed to the mold core frame 4.

[0040] The sliding insert 5 is installed in the mold cavities 13 and 23 of the upper mold 1 and the lower mold 2 respectively, and matched with the slide groove 50. The bottom of the slider 51 of the sliding insert 5 is connected with the limit screw 52, ​​so that there is a certain movable distance between it and the upper mold 1 or the lower mold 2. Then the lens movable insert 6A is installed on the small mold core 81 according to the positioning column 63 and the fixed hole column 824. Then the mold core mechanism 3 fixed on the mold core frame 4 is installed in the lower mold 2 along the column 24. The nostril movable insert 6B is placed in the lower mold 2, matched with the corresponding groove 60, and its plug 62 contacts the plug position 823 on the small mold core 82. Finally, the upper mold 1 is installed together according to the matching direction of the guide hole 11 and the guide column 21, and the assembly of the whole set of molds is completed.

[0041] When in use, align the mold glue inlet hole 22 with the glue injection port of the injection molding machine, and lock the upper template 1 and the lower template 2 with the machine according to the locking grooves 10 and 20; connect the telescopic movable rod of the cylinder with the dovetail groove 941 of the second rack 94, and the cylinder body is connected and fixed with the cylinder connection hole 73 of the mounting plate 7. The machine fixing mechanism is connected to the top plate 42 of the core frame 4.

[0042] During production, after the mold is closed for injection and vulcanization, the upper mold plate 1 is opened to open the mold, and the core mechanism 3 lifts up the top plates 42 on both sides through the machine, and the core assembly 8 leaves the cavity 23 of the lower mold plate 2. The movable insert 6 is manually removed with a screwdriver, and then the cylinder is started to push the two small mold cores 82 out of the large mold core 81. The product on the small mold core 82 is manually removed with an air gun, and the remaining burrs on the mold are cleaned. The cylinder is started again to reset the two small mold cores 82, install the movable lens insert 6A, start the machine top plate 42 to reset, reset the core mechanism 3, put the nostril movable insert 6B back to its original position, and close the upper mold plate 1 to proceed with the next step of injection and vulcanization.

[0043] The above-mentioned preferred implementation modes should be regarded as illustrative examples of the implementation modes of the present application scheme. Any technical deductions, replacements, improvements, etc. that are identical or similar to the present application scheme or made based on this scheme should be regarded as within the scope of protection of this patent.

Claims

1. A mask injection mold for in-mold removal, characterized in that: It includes an upper mold plate, a lower mold plate, a core mechanism and a core frame; The core mechanism is installed on the core frame; The upper template and the lower template are respectively located at the upper and lower sides of the core mechanism and are open and closed. The upper template and the lower template have cavities corresponding to the core mechanism. The core mechanism includes a core assembly and an ejector assembly, wherein the core assembly includes a large core and a small core mounted on the large core; the ejector assembly includes a first rack and a first gear that cooperate with each other; an ejector rod is provided on the inner side of the small core, the ejector rod passes through the large core and is connected to the first rack, the first rack is meshed with the first gear, the first rack performs a linear reciprocating motion under the drive of the rotating first gear, and the small core moves synchronously with the first rack to perform a reciprocating motion of ejection and reset; The ejection assembly further includes a second gear and a second rack, the second rack meshes with the second gear, the second gear is connected to the first gear through a transmission belt, the second rack is driven by a cylinder to perform linear reciprocating motion, the second gear rotates under the drive of the second rack, the first gear rotates synchronously with the second gear, and thus drives the first rack to move; The mold core assembly has two sets, which are symmetrically arranged and the two large mold cores are connected as one body. The ejector assembly is installed in the large mold core, wherein the end of the second rack is exposed outside the large mold core, and one end of the second rack is provided with a dovetail groove for connecting with the movable rod of the cylinder; the first rack has two, which are respectively connected with the ejector rods of the small mold cores of the two mold core assemblies, and the two first racks are respectively located on both sides of the first gear, and reciprocate in opposite directions under the drive of the first gear; The upper and lower ends of the axles of the first gear and the second gear are connected with bearings, and the bearings are installed in the installation grooves in the large mold core.

2. The mask injection mold for in-mold removal according to claim 1, characterized in that: The small mold core is provided with a guide rod, and the large mold core is provided with a guide hole.

3. The mask injection mold for in-mold removal according to claim 2, characterized in that: The core frame includes a fixed plate and top plates on both sides of the fixed plate, the core mechanism is connected to a mounting plate, and the mounting plate is connected and fixed to the fixed plate; the large core is provided with a connecting portion connected to the mounting plate, the second rack is passed through the connecting portion, and a guide groove that cooperates with the second rack is provided on the connecting surface of the mounting plate and the large core, and a cylinder connecting hole for installing the cylinder is provided at one end of the mounting plate.

4. The mask injection mold for in-mold removal according to claim 1, characterized in that: It also includes a sliding insert, which is installed in the cavity of the upper template and the lower template. A slide groove is provided in the cavity. The slide groove has a groove wall that narrows and tilts toward the groove bottom. The sliding insert is provided with a slider, which has an inclined surface corresponding to the groove wall of the slide groove. The slider is installed in the slide groove, and the bottom of the slider is connected to a limit screw. The limit screw passes through the top surface of the upper template or the bottom surface of the lower template to the slide groove and is connected to the slider. The slider can move up along the groove wall of the slide groove and the moving distance is limited by the limit screw.

5. The mask injection mold for in-mold removal according to claim 1, characterized in that: It also includes a movable insert, which is provided with a convex block, and a groove corresponding to the convex block is provided in the cavity; the groove has a groove wall that narrows and tilts toward the groove bottom, and the convex block has an inclined surface corresponding to the groove wall.

6. The mask injection mold for in-mold removal according to claim 5, characterized in that: The movable insert includes a lens movable insert and a nostril movable insert. The small mold core is provided with an insertion position, and the nostril movable insert is provided with an insertion column matched with the insertion position; the small mold core is provided with a positioning hole, and the lens movable insert is provided with a positioning column installed in cooperation with the positioning hole.

7. The mask injection mold for in-mold removal according to claim 1, characterized in that: The lower template is provided with a guide column, the upper template is provided with a guide hole, a guide sleeve is provided in the guide hole, and when the upper template is opened or closed, the inner wall of the guide sleeve moves along the outer wall of the guide column for guidance.

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