Extrusion forming device of light guide plate

Abstract

The invention relates to the technical field of light guide plate forming equipment, in particular to a light guide plate extrusion forming device which comprises an insert replacing mechanism used for rapidly replacing inserts in a mold core. In the invention, after a lifting hook of suspension equipment is buckled with four lifting rings at the top of an insert block, the insert block which is seriously abraded is lifted, then a screw rod I is driven to rotate by a servo motor I, so that a jacking block in a fixed shell is driven to jack the overlapped insert blocks to rise, and clamping seats in sliding cavities on two sides are driven to get close to each other, so that the insert blocks can be clamped and fixed. The second inclined guide face of the clamping base and the first inclined guide face of the insert block are made to slide in an attached mode, so that a new insert block can be driven to ascend to keep the top faces of the other two parts of the insert block flush, the replaced insert block can be conveniently and rapidly installed and positioned, the insert with the reduced precision is partially and rapidly replaced, and the replacement efficiency is improved. And not only can the complicated operation of replacing the whole insert be omitted, but also the high mold cost can be saved, and the production quality of products is effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of light guide plate forming equipment, in particular to an extrusion forming device for a light guide plate. Background Art

[0002] The light guide plate is made of optical-grade acrylic / PC sheet, and then a high-tech material with extremely high refractive index and no light absorption is used to print light guide points on the bottom of the optical-grade acrylic sheet by laser engraving, V-shaped cross grid engraving, and UV screen printing technology. The optical-grade acrylic sheet is used to absorb the light emitted from the lamp and stay on the surface of the optical-grade acrylic sheet. When the light hits each light guide point, the reflected light will diffuse to all angles, and then destroy the reflection condition and emit from the front of the light guide plate. Through various light guide points of different densities and sizes, the light guide plate can emit light evenly. The purpose of the reflective sheet is to reflect the light exposed on the bottom surface back into the light guide plate to improve the efficiency of light use; under the condition of equal area luminous brightness, the luminous efficiency is high and the power consumption is low. The single-sided microstructure array light guide plate generally adopts the extrusion molding production process.

[0003] At present, when producing light guide plates, molten molding materials are filled into a closed mold at high pressure, and then gradually formed after cooling. In order to enable the light guide plate to effectively control the propagation direction of light and increase the brightness of light, many hemispherical grooves are provided on its surface when the light guide plate is formed. These grooves can play an important role in light manipulation, increasing light brightness, and improving visual effects. Therefore, convex spherical inserts are needed in injection molding molds. However, after long-term use, the precision of the insert surface will decrease, so it is necessary to replace the insert of the size of the entire light guide plate. This not only complicates the replacement operation, but also increases the cost of the equipment accordingly. Summary of the invention

[0004] The object of the present invention is to provide an extrusion molding device for a light guide plate, wherein the output ends of the servo motors on both sides of the lower mold drive the screw rods to rotate, thereby driving the clamping seats on both sides of the position where the insert block needs to be replaced to slide in the sliding cavity, so that the insert block is no longer clamped and positioned on both sides, and then the insert block with more severe wear is lifted by interlocking the hook of the suspension device with the four lifting rings on the top of the insert block, and then the servo motor drives the screw rods to rotate, thereby driving the lifting blocks in the fixed shell to push the stacked insert blocks to rise, and then the sliding cavities on both sides are driven The clamping seats in the middle are close to each other, so that the inclined guide surface 2 of the clamping seat and the inclined guide surface 1 of the insert block fit and slide together, thereby driving the new insert block to rise and keeping the top surfaces of the insert blocks of the other two parts flush, and finally making the top of the insert block and the bottom surface of the positioning plate abut against each other, so it is convenient to quickly install and position the replaced insert block, and the positioning accuracy is high. By quickly replacing some inserts with reduced accuracy, not only the tedious operation of replacing the entire insert can be omitted, but also the expensive mold cost can be saved, effectively ensuring the production quality of the product to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A light guide plate extrusion molding device, comprising:

[0007] An insert replacement mechanism, the insert replacement mechanism is used for quickly replacing inserts in a mold core, the insert replacement mechanism comprises a lower mold, a plurality of insert blocks are equidistantly slidably embedded in the interior of the lower mold, a plurality of convex spheres are equidistantly fixedly connected to the top of the insert block, a plurality of inner grooves corresponding to the convex spheres are equidistantly provided at the bottom of the insert block, an inclined guide surface 1 is provided on both sides of the insert block, two sliding cavities are symmetrically provided in the interior of the lower mold, three clamping seats are equidistantly slidably embedded in the sliding cavities, an inclined guide surface 2 is provided on one side of the clamping seat to slide against the inclined guide surface 1, a screw rod 2 rotatably connected to the lower mold is screwed in the clamping seat, and the output end of servo motor 2 is fixedly connected to the two ends of the screw rod;

[0008] The upper mold mechanism is used for injection molding after being spliced ​​with the lower mold.

[0009] Furthermore, the upper mold mechanism includes a support seat, a movable frame is slidably connected in the support seat, two hydraulic cylinders are symmetrically fixedly connected to the top of the movable frame, an upper mold is fixedly connected between the bottom ends of the two hydraulic cylinders, a forming cavity is opened at the bottom of the upper mold, and an injection head connected to the forming cavity is fixedly connected at the center position of the top of the upper mold.

[0010] Furthermore, two limit columns slidably engaged with the movable frame are fixedly connected inside the support seat, a screw rod three is screwed connected to the bottom end of the movable frame, and the end of the screw rod three is fixedly connected to the output end of the servo motor three fixedly connected to the support seat.

[0011] Furthermore, two docking grooves are symmetrically arranged on the top of the insert block, and a closed frame is fixedly connected to the bottom of the upper mold and is slidably embedded in the docking grooves.

[0012] Furthermore, a plurality of cooling water channels 2 are provided in the upper mold at equal distances, one end of each cooling water channel 2 is provided with a water inlet pipe 2 connected thereto, and the other end of each cooling water channel 2 is provided with a water outlet pipe 2 connected thereto.

[0013] Furthermore, a plurality of insert blocks located in the lower mold are stacked and positioned to form an integral insert.

[0014] Furthermore, three fixed shells are fixedly connected at equal distances inside the lower mold, and lifting blocks are slidably sleeved in the three fixed shells. A screw rod 1 is screwed connected at the center position of the lifting block, and the bottom end of the screw rod 1 is fixedly connected to the output end of a servo motor 1, and the top of the lifting block is in contact with the bottom of the insert block.

[0015] Furthermore, the insert block is provided with four cooling water channels 1 at equal distances, and the clamping seat is provided with four connecting holes corresponding to the cooling water channels 1 at equal distances.

[0016] Furthermore, a plurality of water inlet pipes slidably sleeved with the connecting holes are fixedly connected at equal distances on the side wall of the lower mold, and a plurality of water outlet pipes slidably sleeved with the connecting holes are fixedly connected at equal distances on the other side wall of the lower mold.

[0017] Furthermore, a positioning plate which is clamped with the insert block is fixedly connected to the top of the clamping seat.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. A complete insert is formed by splicing three insert blocks in the lower mold of the device. Multiple convex spheres arranged on the surface of each insert block can be used to form the hemispherical groove of the light guide plate. During production, the three output ends of the servo motor drive the screw to rotate, thereby driving the movable frame and the upper mold to move to the top of the lower mold, and then the two hydraulic cylinders drive the upper mold to descend and merge with the lower mold, so that the closing frame at the bottom of the upper mold can be embedded in the docking groove at the top of the insert block, so that the forming cavity forms a closed space, and then the molten liquid molding material is injected into the injection head, followed by rapid cooling and forming. The accuracy of the spherical groove in the light guide plate produced by the detection device can be used to determine whether the insert has been damaged, and then the insert block that has a greater impact on the product accuracy can be replaced.

[0020] 2. When the insert block is clamped and positioned by the clamping seats on both sides, the inclined guide surface 1 and the inclined guide surface 2 are completely overlapped and spliced. At this time, the connecting hole in the clamping seat and the cooling water channel 1 in the insert block are connected. Therefore, when the light guide plate is formed, cold water can be introduced into the connecting hole and the cooling water channel 1 through multiple water inlet pipes 1, so as to help the light guide plate to cool down quickly and increase the forming speed of the light guide plate. After that, the heated water is discharged through the water outlet pipe 1, and the upper mold can also transport cooling water through the cooling water channel 2, the water inlet pipe 2 and the water outlet pipe 2, so that the high temperature generated in the forming cavity at the bottom of the upper mold can be cooled down quickly, thereby ensuring the forming effect and production efficiency of the light guide plate production.

[0021] 3. The output ends of the servo motors on both sides of the lower mold drive the screw rods to rotate, thereby driving the clamping seats on both sides of the position where the insert block needs to be replaced to slide in the sliding cavity, so that the insert block is no longer clamped and positioned on both sides, and then the insert block with more severe wear is lifted by interlocking the hook of the suspension equipment and the four lifting rings on the top of the insert block, and then the servo motor drives the screw rods to rotate, thereby driving the jacking blocks in the fixed shell to push the stacked insert blocks up, and then the clamping seats in the sliding cavities on both sides are driven to approach each other, so that the inclined guide surface 2 of the clamping seat and the inclined guide surface 1 of the insert block fit and slide, so that the new insert block can be driven to rise and keep the top surfaces of the other two parts of the insert block flush, and finally the top of the insert block and the bottom surface of the positioning plate are abutted, so it is convenient to quickly install and position the replaced insert block, and the positioning accuracy is high. By quickly replacing part of the insert with reduced accuracy, not only the tedious operation of replacing the entire insert can be omitted, but also the expensive mold cost can be saved, and the production quality of the product is effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall front view structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the lower mold in the present invention;

[0025] Figure 4 It is a schematic diagram of the internal structure of the lower mold in the present invention;

[0026] Figure 5 It is a schematic diagram of the cross-sectional structure of the insert block in the present invention;

[0027] Figure 6 It is a schematic diagram of the connection structure of the card connector in the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the upper mold mechanism in the present invention;

[0029] Figure 8 It is a schematic diagram of the cross-sectional structure of the upper mold in the present invention.

[0030] In the figure: 100, insert replacement mechanism; 101, lower mold; 102, fixed shell; 103, lifting block; 104, screw rod 1; 105, servo motor 1; 106, insert block; 107, convex sphere; 108, inner groove; 109, cooling water channel 1; 110, docking groove; 111, lifting ring; 112, inclined guide surface 1; 113, clamping seat; 114, inclined guide surface 2; 115, connecting hole; 116, positioning plate; 117, screw rod 2; 118, servo motor 2; 119, water inlet pipe 1; 120, water outlet pipe 1; 121, sliding cavity; 200, upper mold mechanism; 201, support seat; 202, moving frame; 203, limit column; 204, screw rod 3; 205, servo motor 3; 206, hydraulic cylinder; 207, upper mold; 208, injection head; 209, forming cavity; 210, cooling water channel 2; 211, closing frame; 212, water inlet pipe 2; 213, water outlet pipe 2. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-8In an embodiment of the present invention, an extrusion molding device for a light guide plate includes: an insert replacement mechanism 100 and an upper mold mechanism 200. The insert replacement mechanism 100 is used to quickly replace inserts in a mold core. By performing partial and rapid replacement of inserts with reduced precision, not only can the tedious operation of replacing the entire insert be omitted, but also the expensive mold cost can be saved. The insert replacement mechanism 100 includes a lower mold 101, and a plurality of insert blocks 106 are slidably embedded in the lower mold 101 at equal distances. A plurality of convex spheres 107 are fixedly connected to the top of the insert block 106 at equal distances. A plurality of convex spheres 107 are opened at equal distances at the bottom of the insert block 106. An inner groove 108 corresponding to 107, an inclined guide surface 112 is set on both sides of the insert block 106, two sliding cavities 121 are symmetrically opened inside the lower mold 101, and three clamping seats 113 are slidably embedded and connected at a medium distance in the sliding cavity 121, and an inclined guide surface 114 slidably abutting against the inclined guide surface 112 is set on one side of the clamping seat 113, and a screw rod 117 rotatably connected to the lower mold 101 is screwed in the clamping seat 113, and the end of the screw rod 117 is fixedly connected to the output end of the servo motor 118; the upper mold mechanism 200 is used for injection molding after being spliced ​​with the lower mold 101. The upper mold mechanism 200 includes a support base 201, in which a movable frame 202 is slidably connected. Two hydraulic cylinders 206 are symmetrically fixedly connected to the top of the movable frame 202. An upper mold 207 is fixedly connected between the bottom ends of the two hydraulic cylinders 206. A forming cavity 209 is opened at the bottom of the upper mold 207. An injection head 208 connected to the forming cavity 209 is fixedly connected at the center position of the top of the upper mold 207. The support seat 201 is internally fixedly connected with two limit columns 203 which are slidably engaged with the moving frame 202. The bottom end of the moving frame 202 is screwed and connected with a screw rod 3 204. The end of the screw rod 3 204 is fixedly connected with the output end of a servo motor 3 205 which is fixedly connected to the support seat 201. The servo motor 105 drives the screw rod 104 to rotate, thereby driving the jacking block 103 in the fixed shell 102 to push the stacked insert blocks 106 to rise, and then drives the clamping seats 113 in the sliding cavities 121 on both sides to approach each other, so that the inclined guide surface 2 114 of the clamping seat 113 and the inclined guide surface 1 112 of the insert block 106 fit and slide, thereby driving the new insert block 106 to rise and keep the top surfaces of the insert blocks 106 of the other two parts flush, and finally making the top of the insert block 106 abut against the bottom surface of the positioning plate 116, so it is convenient to quickly install and position the replaced insert block 106.

[0033] Two docking grooves 110 are symmetrically provided on the top of the insert block 106. A closed frame 211 is fixedly connected to the bottom of the upper mold 207 and is slidably embedded in the docking groove 110. The upper mold 207 is driven down by two hydraulic cylinders 206 and merged with the lower mold 101, so that the closed frame 211 at the bottom of the upper mold 207 can be embedded in the docking groove 110 at the top of the insert block 106, so that the forming cavity 209 forms a closed space. Multiple insert blocks 106 located in the lower mold 101 are located and stacked to form an integral insert. Three fixed shells 102 are fixedly connected to the lower mold 101 at equal distances. Lifting blocks 103 are slidably sleeved in the three fixed shells 102. A screw rod 104 is screwed and connected at the center of the lifting block 103. The bottom end of the screw rod 104 is fixedly connected to the output end of the servo motor 105. The top of the lifting block 103 contacts the bottom of the insert block 106. A positioning plate 116 that is clamped to the insert block 106 is fixedly connected to the top of the clamping seat 113 .

[0034] Specifically, a complete insert is formed by splicing three insert blocks 106 in the lower mold 101 of the device, and a plurality of convex spheres 107 arranged on the surface of each insert block 106 can be used to form a hemispherical groove of the light guide plate. During production, the output end of the servo motor 205 drives the screw 204 to rotate, thereby driving the moving frame 202 and the upper mold 207 to move to the top of the lower mold 101, and then the two hydraulic cylinders 206 drive the upper mold 207 to descend and merge with the lower mold 101, so that the closed frame 207 at the bottom of the upper mold 207 is 11 can be embedded in the docking groove 110 on the top of the insert block 106, so that the molding cavity 209 forms a closed space, and then the molten liquid molding material is injected into the injection head 208, and then it is molded after rapid cooling. The accuracy of the spherical groove in the light guide plate produced by the detection device can be used to determine whether the insert has been damaged, and then the insert block 106 that has a greater impact on the product accuracy is replaced. The specific replacement method is to first drive the screw rod 117 to rotate through the output end of the servo motor 118 on both sides of the lower mold 101, thereby driving the insert that needs to be replaced The card seats 113 on both sides of the block 106 slide in the sliding cavity 121, so that it no longer card-joins and positions the two sides of the insert block 106, and then the insert block 106 with more serious wear is lifted up by interlocking the hook of the suspension equipment with the four lifting rings 111 on the top of the insert block 106, and then the servo motor 105 drives the screw rod 104 to rotate, thereby driving the lifting block 103 in the fixed shell 102 to push the stacked insert blocks 106 up, and then the card seats 113 in the sliding cavities 121 on both sides are driven to approach each other, so that the card seats 113 in the sliding cavities 121 on both sides are driven to move closer to each other. The second inclined guide surface 114 of the receiving seat 113 and the first inclined guide surface 112 of the insert block 106 fit and slide with each other, thereby driving the new insert block 106 to rise and keeping the top surfaces of the other two parts of the insert block 106 flush, and finally making the top of the insert block 106 abut against the bottom surface of the positioning plate 116, thereby facilitating the rapid installation and positioning of the replaced insert block 106 with high positioning accuracy, and by quickly replacing part of the insert with reduced accuracy, not only the tedious operation of replacing the entire insert can be omitted, but also the expensive mold cost can be saved, effectively ensuring the production quality of the product.

[0035] Embodiment 1

[0036] like Figure 3 and Figure 8As shown, in this embodiment, the upper mold 207 is provided with a plurality of cooling water channels 210 at a medium distance, one end of the cooling water channel 210 is provided with a water inlet pipe 212 connected thereto, and the other end of the cooling water channel 210 is provided with a water outlet pipe 213 connected thereto. The insert block 106 is provided with four cooling water channels 109 at a medium distance, and the clamping seat 113 is provided with four connecting holes 115 corresponding to the cooling water channels 109 at a medium distance, and the inclined guide surface 112 and the inclined guide surface 214 are completely overlapped and spliced, and at this time, the connecting holes 115 in the clamping seat 113 are connected to the cooling water channel 109 in the insert block 106. A plurality of water inlet pipes 119 slidably connected to the connecting hole 115 are fixedly connected at equal distances on the side wall of the lower mold 101, and a plurality of water outlet pipes 120 slidably connected to the connecting hole 115 are fixedly connected at equal distances on the other side wall of the lower mold 101. Cold water is introduced into the connecting hole 115 and the cooling water channel 109 through the plurality of water inlet pipes 119, thereby helping the light guide plate to cool down quickly and improving the forming speed of the light guide plate.

[0037] In this embodiment, when the insert block 106 is clamped and positioned by the clamping seats 113 on both sides, the inclined guide surface 112 and the inclined guide surface 2 114 are completely overlapped and spliced. At this time, the connecting hole 115 in the clamping seat 113 and the cooling water channel 109 in the insert block 106 are connected. Therefore, when the light guide plate is formed, cold water can be introduced into the connecting hole 115 and the cooling water channel 109 through multiple water inlet pipes 119 to help the light guide plate cool down quickly and increase the forming speed of the light guide plate. After that, the heated water is discharged through the water outlet pipe 120, and the upper mold 207 can also transport cooling water through the cooling water channel 2 210, the water inlet pipe 212 and the water outlet pipe 213, so that the high temperature generated by the forming cavity 209 at the bottom of the upper mold 207 can be quickly cooled down, thereby ensuring the forming effect and production efficiency of the light guide plate production.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An extrusion molding device for a light guide plate, characterized in that: include: The insert replacement mechanism (100) is used for quickly replacing inserts in a mold core. The insert replacement mechanism (100) comprises a lower mold (101), wherein a plurality of insert blocks (106) are slidably embedded in the lower mold (101) at equal distances, a plurality of convex spheres (107) are fixedly connected to the top of the insert block (106) at equal distances, a plurality of inner grooves (108) corresponding to the convex spheres (107) are formed at equal distances at the bottom of the insert block (106), and both sides of the insert block (106) are provided with inclined grooves. The lower mold (101) has two sliding cavities (121) symmetrically arranged inside the guide surface one (112), and the sliding cavity (121) is slidably embedded with three clamping seats (113) at a medium distance, and one side of the clamping seat (113) is provided with an inclined guide surface two (114) slidingly abutting against the inclined guide surface one (112), and the clamping seat (113) is screwed and connected with a screw rod two (117) rotatably connected to the lower mold (101), and the end of the screw rod two (117) is fixedly connected with the output end of a servo motor two (118); The upper mold mechanism (200) is used for performing injection molding after being spliced ​​with the lower mold (101).

2. The extrusion molding device of a light guide plate according to claim 1, characterized in that: The upper mold mechanism (200) comprises a support seat (201), a movable frame (202) is slidably connected in the support seat (201), two hydraulic cylinders (206) are symmetrically fixedly connected to the top of the movable frame (202), an upper mold (207) is fixedly connected between the bottom ends of the two hydraulic cylinders (206), a forming cavity (209) is provided at the bottom of the upper mold (207), and an injection head (208) connected to the forming cavity (209) is fixedly connected at the center position of the top of the upper mold (207).

3. The extrusion molding device of a light guide plate according to claim 2, characterized in that: Two limit posts (203) slidably engaged with the moving frame (202) are fixedly connected inside the support seat (201); a screw rod three (204) is screwed connected to the bottom end of the moving frame (202); and the end of the screw rod three (204) is fixedly connected to the output end of a servo motor three (205) fixedly connected to the support seat (201).

4. The extrusion molding device of a light guide plate according to claim 2, characterized in that: Two docking grooves (110) are symmetrically formed on the top of the insert block (106), and a closed frame (211) is fixedly connected to the bottom of the upper mold (207) and is slidably embedded in the docking grooves (110).

5. The extrusion molding device of a light guide plate according to claim 2, characterized in that: The upper mold (207) is provided with a plurality of cooling water channels (210) at medium intervals, one end of the cooling water channel (210) is provided with a water inlet pipe (212) connected thereto, and the other end of the cooling water channel (210) is provided with a water outlet pipe (213) connected thereto.

6. The extrusion molding device of a light guide plate according to claim 5, characterized in that: A plurality of insert blocks (106) located in the lower mold (101) are stacked and positioned to form an integral insert.

7. The extrusion molding device of a light guide plate according to claim 5, characterized in that: Three fixed shells (102) are fixedly connected at equal distances inside the lower mold (101), and lifting blocks (103) are slidably sleeved in the three fixed shells (102). A screw rod (104) is screwed and connected at the center of the lifting block (103), and the bottom end of the screw rod (104) is fixedly connected to the output end of a servo motor (105), and the top of the lifting block (103) is in contact with the bottom of the insert block (106).

8. The extrusion molding device of a light guide plate according to claim 5, characterized in that: The insert block (106) is provided with four cooling water channels (109) at medium intervals, and the clamping seat (113) is provided with four connecting holes (115) corresponding to the cooling water channels (109) at medium intervals.

9. The extrusion molding device of a light guide plate according to claim 8, characterized in that: A plurality of water inlet pipes (119) slidably sleeved with the connecting holes (115) are fixedly connected at equal distances on the side wall of the lower mold (101), and a plurality of water outlet pipes (120) slidably sleeved with the connecting holes (115) are fixedly connected at equal distances on the other side wall of the lower mold (101).

10. The extrusion molding device of a light guide plate according to claim 8, characterized in that: A positioning plate (116) that is clamped with the insert block (106) is fixedly connected to the top of the clamping seat (113).

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