CN112848115B - Double-cavity die of ultrathin medium-size and large-size light guide plate - Google Patents

Abstract

The application relates to a double-cavity die for an ultrathin light guide plate with medium and large size, which comprises a front die set and a rear die set, wherein the front die set comprises a front die fixing plate, a front die base plate and a front die plate; the back module includes the back mould fixed plate, back mould backing plate, carrier plate and back template, the back template is mosaic structure, the back template includes that one leads the jiao bui, two shaping bottom blocks and two sets of shaping side blocks, every group shaping side block with lead the jiao bui surround in order to form the type groove with a shaping bottom block jointly, the front template seals the type groove in order to form the die cavity, it has seted up and leads the jiao bui to lead the jiao bui top surface, the fixed gate cover that is provided with in front mould fixed plate middle part, the fixed orifices has been seted up to the front template, the holding hole has been seted up to the front mould backing plate, the glue piece is led to common ann in fixed orifices and the holding hole, the gate cover has into the jiao Kong, lead the jiao Kong, advance the jiao Kong, lead jiao Kong and shaping chamber and communicate in proper order.

Description

Double-cavity die of ultrathin medium-size and large-size light guide plate

Technical Field

The application relates to the field of light guide plate injection molding production, in particular to a double-cavity mold for an ultrathin medium-size and large-size light guide plate.

Background

The light guide plate (light guide plate) is made of optical acrylic/PC plate, then high-tech material with high refractive index and no light absorption is used, the bottom surface of the optical acrylic plate is printed with light guide points by laser engraving, V-shaped cross grid engraving and UV screen printing technology, the optical acrylic plate is used for absorbing the light emitted from a lamp to stay on the surface of the optical acrylic plate, when the light reaches each light guide point, the reflected light can be diffused to each angle, and then the reflection condition is destroyed to be emitted from the front surface of the light guide plate.

The injection molding of the light guide plate is to fill the melted molding material into a closed mold in a high pressure manner, which requires that the light guide plate and the microstructure are simultaneously completed in the injection molding, and the mold must be made quite firm. The thinner the light guide plate is, the larger the size is, the more difficult the injection molding precision is to control, which makes the current mold have a low molding effect when injection molding the light guide plate.

In view of the above-mentioned related art, the inventors consider that the double-cavity mold for a light guide plate has a defect that the injection molding effect of the light guide plate is low.

Disclosure of Invention

In order to improve the shaping effect of light guide plate, this application provides the double-cavity mould of ultra-thin medium size light guide plate.

The application provides a two cave moulds of ultra-thin well jumbo size light guide plate adopts following technical scheme:

a double-cavity die for an ultrathin light guide plate with a medium size and a large size comprises a front die set and a rear die set, wherein the front die set comprises a front die fixing plate, a front die base plate and a front die plate, and the front die base plate and the front die plate are fixed on the front die fixing plate together through screws; the rear die set comprises a rear die fixing plate, a rear die backing plate, a bearing plate and a rear die plate, the rear die backing plate is fixed on the rear die fixing plate through screws, the rear die backing plate and the bearing plate are fixed on the rear die fixing plate through screws, the rear die plate is of a splicing structure, the rear die plate comprises a rubber guide block, two forming bottom blocks and two groups of forming side blocks, the rubber guide block is fixed in the middle of the top surface of the bearing plate, the two forming bottom blocks are respectively tightly attached to two sides of the rubber guide block, each group of forming side blocks and the rubber guide block jointly surround one forming bottom block to form a groove, the front die plate seals the groove to form a die cavity, the top surface of the rubber guide block is provided with a rubber guide groove which is simultaneously communicated with the forming grooves on two sides, the middle of the front die fixing plate is fixedly provided with a sprue bush, and the front die plate is provided with a fixing hole, the front die backing plate is provided with a containing hole, the fixing hole and the containing hole are provided with a rubber guide piece together, the sprue bush is provided with a rubber inlet hole, the rubber guide piece is provided with a rubber guide hole, and the rubber inlet hole, the rubber guide groove and the forming cavity are communicated in sequence.

Through adopting above-mentioned technical scheme, two sets of shaping side pieces surround in order to form the type groove with the shaping bottom block that leads the gluey piece to correspond respectively, form two type grooves from this simultaneously, and the mould compound die forms two die cavities promptly, can carry out the production of two light guide plates in once moulding plastics, improves production efficiency, reduces the total energy consumption of light guide plate production. And the cavity of the mold can be finely adjusted through the rubber guide block, the molding bottom block and the molding side block, so that the molding precision of the injection molding piece is higher, and the production quality of the light guide plate is improved. Lead the gluey hole of leading of gluey piece and carry out the water conservancy diversion to melting forming material, to not unidimensional light guide plate or to the gluey groove of leading of difference, the design in order to make melting forming material have better mobile effect of gluing the hole is led to the accessible, and then improves the shaping effect of light guide plate.

Optionally, the rubber guide piece comprises a fixing portion and a positioning portion, the fixing portion is fixed in the fixing hole, the positioning portion is accommodated in the accommodating hole, the top surface of the positioning portion is a concave surface, and the bottom surface of the sprue bush is tightly attached to the top surface of the positioning portion.

Through adopting above-mentioned technical scheme, location portion top surface is the concave surface, and sprue bush bottom surface hugs closely in location portion top surface, and the concave surface makes the laminating effect of sprue bush bottom surface and location portion top surface more stable, advances the intercommunication in gluey hole and the rubber guide hole more stable, and then improves the flow stability of melting molding material in the injection process, and further the guarantee light guide plate has better shaping effect.

Optionally, the glue guide groove comprises a first glue groove, a second glue groove and a third glue groove which are sequentially communicated from the middle of the flow channel block to two sides, the length of the first glue groove is gradually increased from the center of the flow channel block to one side communicated with the second glue groove, the length of the second glue groove is gradually increased from one side communicated with the first glue groove to one side communicated with the third glue groove, the maximum length of the second glue groove is equal to the length of the forming bottom block, the length of the third glue groove is uniform and equal to the length of the forming bottom block, the depth of the first glue groove is larger than that of the second glue groove, and the depth of the second glue groove is larger than that of the third glue groove.

Through adopting above-mentioned technical scheme, lead the gluey groove by first gluey groove to the second gluey groove, the second gluey groove enlarges gradually to the third gluey groove until length equals with the shaping bottom block, and simultaneously, the degree of depth in first gluey groove is greater than the degree of depth in second gluey groove, the degree of depth in second gluey groove is greater than the degree of depth in third gluey groove, the injection range increase when making the melting molding material in the first gluey groove arrive in the second gluey groove, and in the same way, the injection range increase when the melting molding material in the second gluey groove reachs in the third gluey groove, and final third gluey groove's injection range is unanimous with the length of light guide plate, and it is better and more stable to fill the mould effect, further improves the shaping effect of light guide plate.

Optionally, a supporting block fixing groove is formed in the top surface of the bearing plate, a supporting block is inserted into the supporting block fixing groove and fixed to the supporting block, the side wall of the supporting block is tightly supported to one side, away from the forming bottom block, of the forming side block to limit the forming side block, a hanging table is fixedly arranged on one side, away from the forming side block, of the supporting block, and the hanging table is lapped at a groove opening of the supporting block fixing groove.

Through adopting above-mentioned technical scheme, support tight piece and contradict in the shaping side piece in order to carry on spacingly to the shaping side piece for the shaping side piece is more stable, supports tight piece and can produce horizontal holding power to the shaping side piece simultaneously, makes the piece of shaping side piece and shaping bottom block and lead the amalgamation of gluing the piece more stable. Hang the platform overlap joint in the notch department of first fixed slot, on the one hand, hang the platform and make the installation of supporting tight piece more convenient, on the other hand, hang the platform and produce stress with the carrier plate top surface for it is difficult for producing the deflection to support tight piece, further improves the stability of supporting tight effect of supporting tight piece to shaping side piece.

Optionally, the carrier plate top surface has been seted up the bottom block constant head tank, the shaping bottom block set up in the bottom block constant head tank, the shaping bottom block with be provided with the bottom block backing plate between the tank bottom of bottom block constant head tank, the shaping bottom block with the bottom block backing plate is fixed in through the screw jointly in the bottom block constant head tank.

Through adopting above-mentioned technical scheme, the shaping bottom block is fixed in the bottom block constant head tank, sets up the bottom block backing plate between the tank bottom of shaping bottom block and bottom block constant head tank, and the bottom block backing plate passes through the fix with screw jointly with the shaping bottom block in the bottom block constant head tank, and the bottom block backing plate makes the shaping bottom block can carry out the fine setting of certain degree, improves the installation accuracy of shaping bottom block, and then improves the injection moulding quality of mould.

Optionally, the bottom surface of the molding side block is provided with a central cushion block and an end side cushion block, the central cushion block is fixed to the bearing plate through a screw, the end side cushion block is also fixed to the bearing plate through a screw, and the end side cushion block and the molding side block are fixed to the bearing plate together through a screw.

Through adopting above-mentioned technical scheme, central cushion bears the weight of shaping side piece with end side cushion for shaping side piece can carry out more meticulous regulation, and end side cushion passes through the screw with shaping side piece again and together is fixed in the carrier plate, makes the fixed effect of shaping side piece more stable.

Optionally, the glue guiding block includes a flow channel block and a flow guiding block, the flow channel block is provided with a flow guiding fixing groove, the flow guiding block is fixed in the flow guiding fixing groove, the top of the flow guiding block is higher than the top surface of the flow channel block, and the side edge of the flow guiding block and the top surface of the flow channel block together form the glue guiding groove.

Through adopting above-mentioned technical scheme, lead the gluey piece and form by runner piece and water conservancy diversion piece equipment to this forms leads gluey groove, can go on further meticulous regulation to leading gluey groove through leading gluey piece or water conservancy diversion piece, makes to lead gluey groove and has better gluey effect of leading, and then has better gluey effect of advancing to the die cavity, has higher shaping quality when further ensuring the light guide plate shaping in the die cavity from this.

Optionally, the front mold fixing plate is fixedly provided with a guide sleeve in a penetrating manner, the guide sleeve is provided with a guide hole, the bearing plate is fixedly provided with a guide pillar, a balance cushion block is fixedly arranged on the bearing plate, the balance cushion block is provided with a yielding hole, and the guide pillar penetrates through the yielding hole and then is inserted into the guide hole of the guide sleeve and is in sliding fit with the guide hole.

Through adopting above-mentioned technical scheme, fixed back template and the balanced cushion of setting of carrier plate top surface, when the mould compound die, preceding template and back template amalgamation, preceding template and balanced cushion are inconsistent simultaneously, balanced cushion partial pressure. When the mould is installed, correspond the amalgamation condition of front bezel and back template, select the balanced cushion of suitable height, balanced cushion can be that the size is all the same, also can be that the size is inequality, position department that stress is big between front bezel and back template, use the balanced cushion that the size is bigger slightly, position department that stress is little between front bezel and back template, use the less balanced cushion of size, all balanced cushions conflict with front bezel jointly, make the stress between front bezel and the back template more even, the stability of die cavity when improving the mould compound die promptly, further improve the shaping effect of light guide plate in the die cavity from this.

Optionally, a mounting hole is formed in the middle of the rear mold base plate, an ejection assembly is arranged in the mounting hole and comprises a thimble, a needle fixing block, a push block and a limiting block, a limiting groove is formed in the push block, the limiting block is inserted into the limiting groove and is in sliding fit with the limiting groove, a limiting fixing groove and a sliding hole are formed in the rear mold fixing plate, the limiting fixing groove is communicated with the sliding hole, the limiting block is fixed in the limiting fixing groove, the push block is arranged in the sliding hole in a sliding manner, the needle fixing block is arranged in the mounting hole in a sliding manner, the push block is fixedly connected with the needle fixing block, and one end of the thimble is fixed to the needle fixing block and the other end of the thimble is penetrated through the bottom wall of the cavity of the mold to push out the injection molding part.

Through adopting above-mentioned technical scheme, when carrying out the injection molding ejecting, exert thrust by the injection molding machine to the ejector pad, the ejector pad moves with the needle fixed block together, the thimble follows the needle fixed block and moves in order ejecting with the injection molding, at this in-process, stopper and spacing groove sliding fit, the stopper produces limiting displacement to the removal of ejector pad and needle fixed block for the removal of ejector pad is more stable, improves the stability of the ejecting effect of injection molding, further ensures that the light guide plate has higher production quality.

Optionally, the needle fixing block is provided with an ejection guide hole, the limiting block is fixed with a guide needle, and the guide needle is inserted into the ejection guide hole and is in sliding fit with the ejection guide hole.

By adopting the technical scheme, the guide pin is inserted into the ejection guide hole and is in sliding fit with the ejection guide hole, when the ejection assembly ejects the injection molding part, the guide pin plays a guiding role in the movement of the needle fixing block, the movement action of the ejector pin is more stable, and the stability of the ejection effect of the injection molding part is further improved.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the glue guide holes of the glue guide pieces guide the flow of the molten molding material, and for light guide plates with different sizes or different glue guide grooves, the molten molding material can have a better flowing effect through the design of the glue guide holes or the replacement of the glue guide pieces, so that the molding effect of the light guide plate is improved;

2. the glue guide groove is gradually enlarged from the first glue groove to the second glue groove, the second glue groove is gradually enlarged to the third glue groove until the length of the glue guide groove is equal to that of the forming bottom block, meanwhile, the depth of the first glue groove is larger than that of the second glue groove, and the depth of the second glue groove is larger than that of the third glue groove, so that the injection range of the molten forming material in the first glue groove when reaching the second glue groove is enlarged, and similarly, the injection range of the molten forming material in the second glue groove when reaching the third glue groove is enlarged, and finally the injection range of the third glue groove is consistent with the length of the light guide plate, so that the mold filling effect is better and more stable, and the forming effect of the light guide plate is further improved;

3. the forming bottom block is fixed in the bottom block positioning groove, a bottom block base plate is arranged between the forming bottom block and the bottom of the bottom block positioning groove, the bottom block base plate enables the forming bottom block to be finely adjusted to a certain degree, the central cushion block and the end side cushion block bear the forming side block, the forming side block can be more finely adjusted, a cavity of the die can be finely adjusted through the forming bottom block and the forming side block, the forming precision of an injection molding piece is higher, and the production quality of the light guide plate is improved;

4. the abutting block abuts against the forming side block to limit the forming side block, so that the forming side block is more stable, the hanging table is lapped at the notch of the first fixing groove, on one hand, the hanging table enables the abutting block to be more convenient to mount, on the other hand, the hanging table and the top surface of the bearing plate generate stress, the abutting block is not prone to deflection, and the stability of the abutting effect of the abutting block on the forming side block is further improved;

5. when the injection molding is ejected, the limiting block is in sliding fit with the limiting groove, and the limiting block generates limiting effect on the movement of the push block and the needle fixing block, so that the push block is more stable in movement, the stability of ejection effect of the injection molding is improved, and the light guide plate is further ensured to have higher molding production quality.

Drawings

FIG. 1 is an overall three-dimensional view of a mold of an embodiment of the present application when closed.

Fig. 2 is a three-dimensional structural view of a front module in an embodiment of the present application.

Fig. 3 is a view of a partially exploded structure of an embodiment of the present application.

Fig. 4 is a view of a partially exploded structure of a rear template in an embodiment of the present application.

Fig. 5 is a view of a partially exploded structure of a rear module in an embodiment of the present application.

Fig. 6 is an enlarged view of a portion a in fig. 3.

Fig. 7 is a relational view of a rear mold shim plate, a rear mold fixing plate and an ejector assembly in an embodiment of the present application.

Fig. 8 is an overall three-dimensional structural view of the ejection assembly in the embodiment of the present application.

Description of reference numerals: 1. a front mold fixing plate; 11. a sprue bush; 111. a glue inlet hole; 12. a guide sleeve; 121. a guide hole; 13. mounting grooves; 2. a front mold backing plate; 21. a housing hole; 3. a front template; 31. a fixing hole; 4. a rear template; 41. a rubber guide block; 411. a flow passage block; 412. a flow guide block; 42. a glue guiding groove; 421. a first glue tank; 422. a second glue groove; 423. a third glue groove; 43. forming a bottom block; 44. molding a side block; 45. a profiled groove; 5. a carrier plate; 51. a supporting block fixing groove; 52. a bottom block positioning groove; 521. a bottom block backing plate; 53. a central slot; 531. a central cushion block; 54. an end side groove; 541. an end side cushion block; 55. a propping block; 551. hanging a table; 56. a guide post; 57. balancing the cushion block; 571. a hole of abdication; 6. a rear mold backing plate; 61. a rear mold cushion block; 62. mounting holes; 7. a rear mold fixing plate; 71. a limiting fixing groove; 72. a slide hole; 8. ejecting the assembly; 81. a thimble; 82. a needle fixing block; 821. ejecting the guide hole; 83. a push block; 831. a limiting groove; 84. a limiting block; 85. guiding a needle; 86. a guide cylinder; 87. a guide post; 88. a return spring; 9. a glue guiding piece; 91. a positioning part; 92. a fixed part; 93. and (6) leading glue holes.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses two cave moulds of ultra-thin medium size light guide plate, refer to fig. 1 and fig. 2, including front module and back module, front module includes front mould fixed plate 1, front mould backing plate 2 and front mould board 3, and front mould backing plate 2 passes through the screw with front mould board 3 and is fixed in front mould fixed plate 1 together. The back module includes back mould fixed plate 7, back mould backing plate 6, carrier plate 5 and back template 4, and back mould backing plate 6 passes through the fix with screw in back mould fixed plate 7 to back mould backing plate 6 is together fixed in back mould fixed plate 7 through the screw with carrier plate 5 again. When the front module and the rear module are combined, the front template 3 and the rear template 4 are mutually spliced to form a cavity for injection molding of the light guide plate.

Referring to fig. 3 and 4, the rear mold plate 4 is a splicing structure, the rear mold plate 4 includes a rubber guide block 41, two molding bottom blocks 43 and two sets of molding side blocks 44, the rubber guide block 41 is rectangular, the rubber guide block 41 is fixed to the middle of the top surface of the carrier plate 5 by countersunk screws, specifically, in combination with fig. 5, the rubber guide block 41 includes a flow channel block 411 and a flow guide block 412, the flow channel block 411 has an approximately "H" shape, flow guide fixing grooves are formed at two ends of the flow channel block 411 in the length direction, the profile of the flow guide block 412 is identical to that of the flow guide fixing grooves, the flow guide block 412 is inserted into the flow guide fixing grooves, the flow channel block 411 and the flow guide block 412 are fixed to the carrier plate 5 by countersunk screws, the top of the flow guide block 412 is higher than the top surface of the flow channel block 411, and the side edges of the flow guide block 412 and the top surface of the flow channel block 411 form a rubber guide groove 42 together. Referring back to fig. 4, the glue guiding groove 42 includes a first glue groove 421, a second glue groove 422 and a third glue groove 423 which are sequentially communicated from the middle part of the runner block 411 to both sides, the length of the first glue groove 421 is gradually increased from the center position of the runner block 411 to one side communicated with the second glue groove 422, the length of the first glue groove 421 is smaller than the length of the forming bottom block 43, and the depth of the first glue groove 421 is between 1mm and 3 mm; the length of the second glue groove 422 is gradually increased from one side communicated with the first glue groove 421 to one side communicated with the third glue groove 423, the maximum length of the second glue groove 422 is equal to the length of the forming bottom block 43, and the depth of the second glue groove 422 is between 0.5mm and 1.5 mm; the length of the third glue groove 423 is uniform and equal to the length of the molding bottom block 43, that is, the length of the third glue groove 423 is equal to the length of the light guide plate product, and the depth of the third glue groove 423 is between 0.3mm and 1 mm. It should be noted that the depth of the first glue groove 421 is greater than the depth of the second glue groove 422, and the depth of the second glue groove 422 is greater than the depth of the third glue groove 423. In this embodiment, for a catheter plate with a molding thickness of 0.5mm, the depth of the first glue groove 421 is preferably 2mm, the depth of the second glue groove 422 is preferably 1.2mm, and the depth of the third glue groove 423 is preferably 0.5 mm.

Referring to fig. 4 and 5, the forming bottom block 43 is a cube, the forming bottom block 43 is fixed to the carrier plate 5 by countersunk screws, and the two forming bottom blocks 43 are respectively attached to two sides of the runner block 411. The position of the top surface of the carrier plate 5 corresponding to the molded bottom block 43 is provided with a bottom block positioning groove 52, a bottom block base plate 521 is arranged in the bottom block positioning groove 52, the horizontal cross section contour of the bottom block base plate 521 is consistent with that of the molded bottom block 43, the bottom surface of the bottom block base plate 521 is tightly attached to the bottom of the bottom block positioning groove 52, the bottom of the molded bottom block 43 is inserted into the bottom block positioning groove 52, the bottom surface of the molded bottom block 43 is tightly attached to the top surface of the bottom block base plate 521, the top surface of the molded bottom block 43 is slightly lower than that of the rubber guide block 41, and specifically, the height difference between the top surface of the molded bottom block 43 and the top surface of the rubber guide block 41 depends on the thickness of an injection molding piece.

With continued reference to fig. 4 and 5, two sets of molding side blocks 44 correspond to the two molding bottom blocks 43 one-to-one, and each set of molding side blocks 44 and the rubber guide block 41 together surround the corresponding molding bottom block 43 to form a groove 45 of the injection molded part. In this embodiment, each set of forming side blocks 44 includes three forming side blocks 44, each forming side block 44 is fixed to the carrier plate 5 by a countersunk head screw, and the three forming side blocks 44 and the rubber guide block 41 respectively and simultaneously abut against four side walls of the forming bottom block 43. The top surface of the molding side block 44 and the top surface of the rubber guide block 41 are located at the same level. The top surface of the carrier plate 5 corresponding to each forming side block 44 is further provided with a central groove 53 and two end side grooves 54, and the central groove 53 and the end side grooves 54 are both communicated with the bottom block positioning groove 52. A center pad 531 is inserted into the center groove 53, the center pad 531 is fixed in the center groove 53 by a countersunk screw, the top surface of the center pad 531 abuts against the middle of the bottom surface of the molded side block 44, an end side pad 541 is inserted into the end side groove 54, the end side pads 541 are fixed in the end side groove 54 by countersunk screws, and the top surfaces of the two end side pads 541 abut against the two ends of the bottom surface of the molded side block 44 respectively. In this embodiment, preferably, the side edge of the central cushion block 531 abuts against the forming bottom block 43 at the same time, so that the combining of the forming bottom block 43 and the flow channel block 411 is more stable. In order to make the combination of the molding side block 44, the molding bottom block 43 and the glue guide block 41 more compact and stable, a pressing block 55 is also fixedly arranged on the carrier plate 5. The top surface of the carrier plate 5 is provided with a supporting block fixing groove 51 corresponding to the supporting block 55, and the supporting block 55 is inserted into the corresponding supporting block fixing groove 51 and fixed in the supporting block fixing groove 51 through a countersunk head screw. Specifically, in the present embodiment, a pressing block 55 is disposed on a side of each of the forming side blocks 44 away from the forming bottom block 43, and the six pressing blocks 55 press all the forming side blocks 44 toward the center together. The side of the abutting block 55 far away from the rubber guide block 41 is integrally formed with a hanging table 551, the hanging table 551 is located at the top of the abutting block 55, and the bottom surface of the hanging table 551 is tightly attached to the top surface of the bearing plate 5.

Referring to fig. 2, a mounting groove 13 is formed in the bottom surface of the front mold fixing plate 1, the front mold backing plate 2 is fixed to the bottom of the mounting groove 13 by screws, the front mold plate 3 is inserted into the mounting groove 13 and abuts against the front mold backing plate 2, and the front mold plate 3 and the front mold backing plate 2 are fixed to the mounting groove 13 together by screws. In this embodiment, it should be noted that the thickness of the front mold backing plate 2 is less than the thickness of the mounting groove 13, and the sum of the thickness of the front mold backing plate 2 and the thickness of the front mold plate 3 is greater than the thickness of the mounting groove 13, so that the front mold plate 3 can be stably inserted into the mounting groove 13, and a good mounting effect is achieved on the front mold plate 3, and meanwhile, the front mold plate 3 is prevented from being recessed into the mounting groove 13, so that the front mold plate 3 has a stable sealing effect on the cavity.

Referring to fig. 3 and 6, the middle part of the front die backing plate 2 is provided with a containing hole 21, the middle part of the front die plate 3 is provided with a fixing hole 31, the axis of the fixing hole 31 coincides with the axis of the containing hole 21, and one rubber guide member 9 is simultaneously installed in the fixing hole 31 and the containing hole 21. The rubber guide 9 includes a fixing portion 92 and a positioning portion 91 integrally formed, the positioning portion 91 and the fixing portion 92 are both cylindrical, the diameter of the positioning portion 91 is larger than that of the fixing portion 92, the positioning portion 91 is located above the fixing portion 92, and the positioning portion 91 and the fixing portion 92 are coaxially disposed. The diameter of the fixing portion 92 is slightly larger than the diameter of the fixing hole 31, the fixing portion 92 is inserted into the fixing hole 31 and is in interference fit with the fixing hole 31 so that the fixing portion 92 is fixed in the fixing hole 31, and the positioning portion 91 is accommodated in the accommodating hole 21. In this embodiment, preferably, the front template 3 includes two front template jointed boards, the two front template jointed boards are in the shape of a plate with the same size, the side edges of the two front template jointed boards, which are mutually attached, are both provided with first half grooves, and the two first half grooves are spliced to form fixing holes; the front mould backing plate 2 comprises two front mould pad jointed plates, the two front mould pad jointed plates are in a plate shape with the same size, the side edges of the two front mould pad jointed plates, which are mutually attached, are provided with two half grooves, and the two half grooves are spliced to form accommodating holes. A sprue bush 11 is fixedly arranged in the middle of the front mold fixing plate 1 in a penetrating mode, the sprue bush 11 is provided with a glue inlet hole 111, a glue guide hole 93 is formed in the glue guide part 9, and the glue guide hole 93 is formed in the top surface of the positioning part 91 and penetrates through the glue guide part 9 to the bottom surface of the fixing part 92. When the front mold backing plate 2 and the front mold plate 3 are fixed to the front mold fixing plate 1, the bottom surface of the sprue bush 11 and the top surface of the fixing portion 92 abut against each other, and the glue inlet hole 111, the glue guide hole 93, the glue guide groove 42 and the cavity are sequentially communicated. In order to make the communication effect between the glue inlet hole 111 and the glue guide hole 93 more stable, in this embodiment, on one hand, the aperture of the accommodating hole 21 is larger than the diameter of the positioning portion 91, and on the other hand, the top surface of the positioning portion 91 is a concave surface, so that the abutting of the positioning portion 91 and the sprue bush 11 is more stable.

Referring to fig. 3, the guide sleeves 12 are respectively and fixedly arranged at four corners of the front mold fixing plate 1, the guide sleeves 12 are cylindrical, the guide sleeves 12 are provided with guide holes 121, guide pillars 56 are respectively and fixedly arranged at four corners of the carrier plate 5, the guide pillars 56 are cylindrical, and the four guide pillars 56 are in one-to-one insertion connection with the four guide sleeves 12 and are in sliding fit with each other to guide the mold closing and opening of the mold. The four corners position department of carrier plate 5 top surface is provided with balanced cushion 57, and balanced cushion 57 passes through countersunk screw to be fixed in the carrier plate 5 top surface, and the top surface of balanced cushion 57 and the top surface of shaping side piece 44 are located the coplanar. The positions of the four balance cushion blocks 57 correspond to the positions of the four guide pillars 56 one by one, the balance cushion blocks 57 are respectively provided with a yielding hole 571, and the guide pillars 56 penetrate through the yielding holes 571 of the balance cushion blocks 57 at the corresponding positions and then are inserted into the corresponding guide holes 121 of the guide sleeves 12 and are in sliding fit with the guide holes 121. In order to reduce the friction of the inner wall of the relief hole 571 against the guide pillar 56, in the present embodiment, the diameter of the relief hole 571 is larger than the diameter of the guide pillar 56. In order to make the guide post 56 and the guide sleeve 12 more smoothly inserted, in this embodiment, the top end of the guide post 56 is rounded and the bottom end of the guide sleeve 12 is rounded, so as to reduce the possibility of rigid collision between the guide post 56 and the guide sleeve 12 during insertion.

Referring to fig. 1 and 7, the rear mold liner 6 includes a plurality of rear mold cushion blocks 61, all of the rear mold cushion blocks 61 are assembled together to form the rear mold liner 6, and a mounting hole 62 is formed in the middle of the rear mold liner 6. The mounting hole 62 is provided with the ejector assembly 8.

Referring to fig. 7 and 8, the ejection assembly 8 includes an ejector pin 81, a pin fixing block 82, and a push block 83. In this embodiment, the mounting hole 62 is preferably a square hole, the needle fixing block 82 is a square block having a contour shape identical to the contour shape of the mounting hole 62, the needle fixing block 82 is slidably disposed in the mounting hole 62, the ejector pin 81 is disposed in the middle of the needle fixing block 82, the bottom end of the ejector pin 81 is fixed to the needle fixing block 82, and the other end of the ejector pin 81 penetrates through the bottom wall of the cavity of the mold to eject the injection molding part. The needle fixing block 82 penetrates through and is fixedly provided with a guide cylinder 86, the guide cylinder 86 is a cylinder with the height being consistent with that of the needle fixing block 82, a guide post 87 is inserted into the guide cylinder 86, with reference to fig. 3, the top end of the guide post 87 is fixed on the bearing plate 5, the bottom end of the guide post 87 is fixed on the rear mold fixing plate 7, and the guide post 87 guides and limits the movement of the needle fixing block 82. In this embodiment, a return spring 88 is further sleeved on the guide post 87, the top end of the return spring 88 abuts against the bottom surface of the carrier plate 5, the bottom end of the return spring 88 abuts against the top surface of the needle fixing block 82, and after the injection molding part is ejected out, the push block 83 and the needle fixing block 82 can automatically reset under the elastic force action of the return spring 88.

With continued reference to fig. 7 and 8, a position corresponding to the needle fixing block 82 in the middle of the rear mold fixing plate 7 is provided with a limiting fixing groove 71 and a sliding hole 72, the sliding hole 72 vertically penetrates through the rear mold fixing plate 7, the limiting fixing groove 71 is provided by the top surface of the rear mold fixing plate 7, that is, the limiting fixing groove 71 is disposed at the top end of the sliding hole 72, the limiting fixing groove 71 is communicated with the sliding hole 72, and the push block 83 is inserted into the sliding hole 72 and is in sliding fit with the sliding hole 72. The pushing block 83 and the needle fixing block 82 are fixed by a countersunk screw, so that the pushing block 83 can drive the needle fixing block 82 to move to control the ejection of the thimble 81. The top surface of the pushing block 83 is provided with a limiting groove 831, and the limiting groove 831 is communicated with the limiting fixing groove 71. The limiting block 84 is fixedly arranged in the limiting fixing groove 71 through a countersunk screw, and the limiting block 84 simultaneously penetrates through the limiting groove 831 and is in sliding fit with the limiting groove 831. When the push block 83 moves together with the needle fixing block 82, the stopper 84 has a function of restricting the movement of the push block 83 and the needle fixing block 82. The middle of the top surface of the limit block 84 is fixedly provided with a guide pin 85, the bottom surface of the needle fixing block 82 is provided with an ejection guide hole 821, the guide pin 85 is inserted into the ejection guide hole 821 and is in sliding fit with the ejection guide hole 821, and when the push block 83 and the needle fixing block 82 move together, the guide pin 85 guides and limits the needle fixing block 82 so that the ejection effect of the thimble 81 is more stable.

The implementation principle of the double-cavity mold of the ultrathin middle-size and large-size light guide plate in the embodiment of the application is as follows: two sets of shaping side pieces 44 surround the shaping bottom piece 43 that corresponds with leading gluey piece 41 respectively in order to form type groove 45, form two type grooves 45 simultaneously from this, and the mould compound die forms two die cavities promptly, and the die cavity of mould can carry out the fine adjustment through leading gluey piece 41, shaping bottom piece 43 and shaping side piece 44 for the shaping precision of injection molding is higher, improves the quality of light guide plate production. Lead gluey hole 93 of leading of gluing piece 9 and carry out the water conservancy diversion to melting forming material, to the light guide plate of unidimensional not or to the gluey groove 42 of leading of difference, the design of accessible leading gluey hole 93 or lead the change of gluing piece 9 so that melting forming material has better mobile effect, and then improves the shaping effect of light guide plate. The glue guide groove 42 is formed by a first glue groove 421 to a second glue groove 422, the second glue groove 422 gradually expands to a third glue groove 423 until the length is equal to the forming bottom block 43, meanwhile, the depth of the first glue groove 421 is larger than that of the second glue groove 422, and the depth of the second glue groove 422 is larger than that of the third glue groove 423, so that the injection range of the molten forming material in the first glue groove 421 reaching the second glue groove 422 is enlarged, and in the same way, the injection range of the molten forming material in the second glue groove 422 reaching the third glue groove 423 is enlarged, and finally, the injection range of the third glue groove 423 is consistent with the length of the light guide plate, so that the mold filling effect is better and more stable, and the forming effect of the light guide plate is further improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. A double-cavity die for an ultrathin medium-size and large-size light guide plate is characterized in that: the front die comprises a front die set and a rear die set, wherein the front die set comprises a front die fixing plate (1), a front die base plate (2) and a front die plate (3), and the front die base plate (2) and the front die plate (3) are fixed on the front die fixing plate (1) together through screws; the rear die set comprises a rear die fixing plate (7), a rear die backing plate (6), a bearing plate (5) and a rear die plate (4), the rear die backing plate (6) is fixed on the rear die fixing plate (7) through screws, the rear die backing plate (6) and the bearing plate (5) are fixed on the rear die fixing plate (7) through screws, the rear die plate (4) is of a splicing structure, the rear die plate (4) comprises a rubber guide block (41), two forming bottom blocks (43) and two groups of forming side blocks (44), the rubber guide block (41) is fixed in the middle of the top surface of the bearing plate (5), the two forming bottom blocks (43) are tightly attached to two sides of the rubber guide block (41), each group of the forming side blocks (44) and the rubber guide block (41) together surround one forming bottom block (43) to form a forming groove (45), and the front die plate (3) seals the forming groove (45) to form a die cavity, the top surface of the rubber guide block (41) is provided with a rubber guide groove (42), the rubber guide groove (42) is communicated with the forming grooves (45) on two sides, the middle part of the front mold fixing plate (1) is fixedly provided with a sprue bush (11), the front mold plate (3) is provided with a fixing hole (31), the front mold backing plate (2) is provided with a containing hole (21), the fixing hole (31) and the containing hole (21) are jointly provided with a rubber guide part (9), the sprue bush (11) is provided with a rubber inlet hole (111), the rubber guide part (9) is provided with a rubber guide hole (93), and the rubber inlet hole (111), the rubber guide hole (93), the rubber guide groove (42) and the forming cavity are communicated in sequence;

the rear die cushion plate (6) comprises a plurality of rear die cushion blocks (61), all the rear die cushion blocks (61) are spliced together to form the rear die cushion plate (6), a mounting hole (62) is formed in the middle of the rear die cushion plate (6), an ejection assembly (8) is arranged in the mounting hole (62), the ejection assembly (8) comprises a thimble (81), a needle fixing block (82), a push block (83) and a limiting block (84), the push block (83) is provided with a limiting groove (831), the limiting block (84) is inserted into the limiting groove (831) and is in sliding fit with the limiting groove (831), the rear die fixing plate (7) is provided with a limiting fixing groove (71) and a sliding hole (72), the limiting fixing groove (71) is communicated with the sliding hole (72), the limiting block (84) is fixed in the limiting fixing groove (71), and the push block (83) is arranged in the sliding hole (72) in a sliding manner, the needle fixing block (82) is arranged in the mounting hole (62) in a sliding mode, the push block (83) is fixedly connected with the needle fixing block (82), one end of the ejector pin (81) is fixed to the needle fixing block (82), and the other end of the ejector pin penetrates through the bottom wall of a cavity of the mold to be used for ejecting an injection molding piece out;

the needle fixing block (82) is provided with an ejection guide hole (821), the limiting block (84) is fixedly provided with a guide needle (85), and the guide needle (85) is inserted into the ejection guide hole (821) and is in sliding fit with the ejection guide hole (821).

2. The double-cavity mold for an ultra-thin middle and large size light guide plate as claimed in claim 1, wherein: the glue guide piece (9) comprises a fixing part (92) and a positioning part (91) which are integrally arranged, the fixing part (92) is fixed in the fixing hole (31), the positioning part (91) is accommodated in the accommodating hole (21), the top surface of the positioning part (91) is a concave surface, and the bottom surface of the sprue bush (11) is tightly attached to the top surface of the positioning part (91).

3. The double-cavity mold for an ultra-thin middle and large size light guide plate as claimed in claim 1, wherein: the glue guide groove (42) comprises a first glue groove (421), a second glue groove (422) and a third glue groove (423) which are sequentially communicated from the middle part of the runner block (411) to two sides, the length of the first glue groove (421) is gradually increased from the center position of the runner block (411) to one side communicated with the second glue groove (422), the length of the second glue groove (422) is gradually increased from one side communicated with the first glue groove (421) to one side communicated with the third glue groove (423), the maximum length of the second glue groove (422) is equal to the length of the forming bottom block (43), the length of the third glue groove (423) is uniform and equal to the length of the forming bottom block (43), the depth of the first glue groove (421) is greater than that of the second glue groove (422), and the depth of the second glue groove (422) is greater than that of the third glue groove (423).

4. The double-cavity mold for an ultra-thin middle and large size light guide plate as claimed in claim 1, wherein: the top surface of the bearing plate (5) is provided with a supporting block fixing groove (51), a supporting block (55) is inserted and fixed in the supporting block fixing groove (51), the side wall of the supporting block (55) is tightly supported on one side, away from the forming bottom block (43), of the forming side block (44) to limit the forming side block (44), a hanging table (551) is fixedly arranged on one side, away from the forming side block (44), of the supporting block (55), and the hanging table (551) is lapped on the notch of the supporting block fixing groove (51).

5. The double-cavity mold for an ultra-thin middle and large size light guide plate as claimed in claim 1, wherein: bottom block constant head tank (52) have been seted up to carrier plate (5) top surface, shaping bottom block (43) set up in bottom block constant head tank (52), shaping bottom block (43) with be provided with bottom block backing plate (521) between the tank bottom of bottom block constant head tank (52), shaping bottom block (43) with bottom block backing plate (521) are jointly through the fix with screw in bottom block constant head tank (52).

6. The double-cavity mold for an ultra-thin middle and large size light guide plate as claimed in claim 1, wherein: the bottom surface of the molding side block (44) is provided with a central cushion block (531) and an end side cushion block (541), the central cushion block (531) is fixed on the bearing plate (5) through screws, the end side cushion block (541) is also fixed on the bearing plate (5) through screws, and the end side cushion block (541) and the molding side block (44) are fixed on the bearing plate (5) through screws together.

7. The double-cavity mold for an ultra-thin middle and large size light guide plate as claimed in claim 1, wherein: the glue guiding block (41) comprises a flow channel block (411) and a flow guiding block (412), a flow guiding fixing groove is formed in the flow channel block (411), the flow guiding block (412) is fixed in the flow guiding fixing groove, the top of the flow guiding block (412) is higher than the top surface of the flow channel block (411), and the side edge of the flow guiding block (412) and the top surface of the flow channel block (411) jointly form the glue guiding groove (42).

8. The double-cavity mold for an ultra-thin middle and large size light guide plate as claimed in claim 1, wherein: front mould fixed plate (1) runs through and is fixed with guide pin bushing (12), guide pin bushing (12) have guiding hole (121), carrier plate (5) are fixed with guide pillar (56), the fixed balanced cushion (57) that is provided with on carrier plate (5), balanced cushion (57) have been seted up and have been stepped down hole (571), guide pillar (56) pass insert behind stepping down hole (571) in guiding hole (121) of guide pin bushing (12) and with guiding hole (121) sliding fit.

Images