Lens filling system

Abstract

The present invention provides a lens mold filling system, which belongs to the field of lens production equipment, and includes: a mold filling component for filling resin liquid into a lens mold, the mold filling component includes: a single injection needle, the single injection needle is an electric heating needle; a liquid level monitoring mechanism; a driving member; the liquid level monitoring mechanism includes a liquid level sensor arranged directly above the lens mold, and a liquid level switch arranged near the lens mold injection port, the liquid level sensor and the liquid level switch are electrically connected to the flow control valve. The mold filling component of the present invention is set as a single injection needle, and the reflux pipe is eliminated, giving the liquid level sensor enough space to improve the accuracy; the method of forming the injection port by hot needle hotting replaces the traditional direct acupuncture method, which can make the injection port smooth and reduce the size of the injection port, thereby reducing the generation of bubbles, that is, using the simplest modular design, so that it can better meet the automatic filling assembly line.

Description

Technical Field

[0001] The invention belongs to the field of lens production equipment, and in particular relates to a lens filling system. Background Art

[0002] Resin lenses are an organic material that is internally connected by a polymer chain structure to form a three-dimensional network structure. The molecular structure is relatively loose, and the molecular chains can produce relative displacement. It has the advantages of good light transmittance and strong impact resistance, so it is gradually replacing glass lenses. The manufacturing process of resin lenses includes monomer configuration, mold filling, polymerization and curing. During the filling process, liquid monomers need to be injected into the assembled mold. Traditionally, filling is done manually, which has low production efficiency and high labor costs.

[0003] Based on the above problems, the prior art (CN105235154B) discloses a lens mold filling machine, including a workbench, an automatic detection control system, and a mold input mechanism, a mold output mechanism, a central turntable, a filling device, and a film sealing device arranged on the workbench. The injection, mold filling, film pasting and film sealing processes are distributed on one device through the central turntable, and the dosage of mold filling is detected and controlled by an industrial camera. The whole machine has a high degree of automation, a good filling effect, and can complete the filling and film sealing processes at the same time, reducing the lens production process, reducing labor, and replacing the existing manual filling process. However, the filling device of the prior art includes a filling tube and a return tube, that is, a double needle setting, and the filling needle directly punctures the tape. When the needle is withdrawn, it is not only easy to tear the filling port, but also causes the size of the filling port to become larger, and it is easy to generate bubbles. Summary of the invention

[0004] Based on the above background issues, the present invention aims to provide a lens mold filling system, which is equipped with a single injection needle and uses a hot needle method to insert the needle, thereby solving the defect of the prior art that the injection port is torn when the needle is withdrawn, reducing the size of the injection port, thereby reducing the generation of bubbles and improving the quality of the lens.

[0005] In order to achieve the above object, the technical solution provided by the present invention is:

[0006] A lens mold filling system comprises: a mold filling component for filling resin liquid into a lens mold, the mold filling component comprising: a single injection needle connected to an injection pipe provided with a flow control valve, the single injection needle being an electric heating needle, used to heat the tape on the lens mold to form an injection port; a liquid level monitoring mechanism, used to monitor the liquid level in the lens mold to control the opening and closing and size of the flow control valve; the liquid level monitoring mechanism comprises a liquid level sensor arranged directly above the lens mold, and a liquid level switch arranged adjacent to the lens mold injection port, the liquid level sensor and the liquid level switch are both electrically connected to the flow control valve.

[0007] The single injection needle and the liquid level sensor are driven to move up and down synchronously by a driving member, and the liquid level switch is a distance switch or a photoelectric switch.

[0008] The lens mold filling system further comprises a mold fixing assembly for supporting the erected lens mold and moving the lens mold to the mold filling assembly, wherein the mold fixing assembly comprises:

[0009] The clamping member includes a first roller group and a second roller group which are arranged opposite to each other and are used for clamping the side surface of the vertically arranged lens mold;

[0010] A moving member, including a first slide rail, for allowing the clamping member to move to the mold filling assembly;

[0011] The extrusion piece includes a first extrusion plate and a second extrusion plate which are arranged opposite to each other and are used for clamping the surface of the vertically arranged lens mold so as to drive the lens mold to rotate after the filling is completed.

[0012] In one embodiment, the first roller group and the second roller group are arranged on a sliding block opposite to each other, and the sliding block is slidably connected to a first sliding rail.

[0013] Preferably, the first roller group and the second roller group are movably connected to the slider to match lens molds of different sizes.

[0014] In one embodiment, the first extrusion plate is arranged on the slider to move synchronously with the clamping member, and the second extrusion plate is movably arranged at a position corresponding to the mold filling assembly to cooperate with the first extrusion plate to clamp the surface of the lens mold when the clamping member moves to the mold filling assembly.

[0015] Preferably, the second extrusion plate is connected to a rotary cylinder, the rotary cylinder is slidably connected to a second slide rail, and the second slide rail is arranged perpendicular to the first slide rail.

[0016] The lens mold canning system further comprises a sealing film assembly for sealing a material injection port on the lens mold, wherein the sealing film assembly comprises:

[0017] The film sticking mechanism comprises: a tape roll having a drooping section, and a vertical cylinder for controlling the tape roll to reciprocate up and down, wherein the drooping section is arranged adjacent to the first roller group / the second roller group so that the drooping section can be attached to the roller of the first roller group / the second roller group when the tape roll moves downward;

[0018] The film cutting mechanism comprises a horizontally arranged blade for cutting the adhesive tape, and a horizontal cylinder for controlling the horizontal reciprocating movement of the blade.

[0019] Wherein, the film sticking mechanism is configured as follows: when the lens mold moves to the bottom of the mold filling assembly, the drooping section is located above the first roller group / the second roller group, and the vertical cylinder drives the tape roll to move downward while the first roller group and the second roller group move away from each other so that the drooping section of the tape roll sticks to the rollers of the first roller group / the second roller group.

[0020] Compared with the prior art, the present invention has the following effects:

[0021] 1. The mold filling assembly of the present invention is set up with a single injection needle, eliminating the reflux pipe, giving the liquid level sensor enough space to improve accuracy; the method of using a hot needle to form an injection port replaces the traditional direct acupuncture method, which can make the injection port smooth and reduce the size of the injection port, thereby reducing the generation of bubbles and improving the quality of the lens. That is, using the simplest modular design, it can better meet the needs of the automatic filling line.

[0022] 2. The present invention monitors the liquid level through a liquid level sensor and a liquid level switch, and adapts the flow control valve to accelerate the filling in the early stage and slow down the filling in the later stage; and adopts an overflow design, the overflow amount of resin will have a certain amount of reflux as the injection needle is pulled out, solving the bubble problem caused by needle puncture.

[0023] 3. The present invention does not need to move the lens mold through the central turntable, which can reduce the filling time to avoid errors such as leakage. After the filling is completed, the film is directly sealed by rotating the rotary cylinder, which speeds up the tape packaging speed and saves space, which is more in line with the requirements of the automated production line.

[0024] 4. The overall structure of the present invention is simpler and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0026] Figure 1 It is a structural schematic diagram of a lens mold filling system according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A top view of the machine (excluding the base);

[0028] Figure 3 It is a schematic diagram of the structure of the clamping member and the moving member in an embodiment of the present invention;

[0029] Figure 4 for Figure 3 A schematic diagram of the structure of the second roller frame;

[0030] Figure 5 for Figure 3 A top view of the moving parts;

[0031] Figure 6 It is a schematic diagram of the structure of an extrusion part in an embodiment of the present invention;

[0032] Figure 7 It is a structural schematic diagram of a mold filling assembly in an embodiment of the present invention;

[0033] Figure 8 for Figure 7 Schematic diagram of the structure of the mounting plate. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0035] In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings of the specification, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, it should be noted that the terms "first" and "second" are only for the convenience of description and cannot be understood as indicating or implying relative importance.

[0036] In order to solve the problems existing in the prior art, the present invention provides a lens mold filling system for canning lens molds 100, such as Figure 1 As shown, it includes: a mold filling assembly 200 for filling resin liquid into the lens mold 100; a mold fixing assembly 300 for vertically supporting the lens mold 100 and moving the lens mold 100 to the mold filling assembly 200; and a film sealing assembly 400 for sealing the injection port on the lens mold 100. The mold fixing assembly 300 is arranged below the mold filling assembly 200, and the film sealing assembly 400 is arranged on the right side of the mold filling assembly 200 and the mold fixing assembly 300.

[0037] In this embodiment, the mold filling assembly 200, the mold fixing assembly 300 and the film sealing assembly 400 are all arranged on a machine base. Figure 1 and 2 As shown, the mold fixing assembly 300 includes: a clamping member, a moving member and an extruding member; specifically, as Figure 3 As shown, the clamping member includes a first roller group and a second roller group which are arranged opposite to each other and distributed left and right. The first roller group and the second roller group are arranged on the slider 1. The first roller group includes a first roller 101 and a second roller 102 which are spaced apart from each other in the upper and lower parts. The first roller 101 and the second roller 102 are supported by a first roller frame 103. Specifically, the right end of the first roller frame 103 is open, so that the first roller frame 103 is a concave structure as a whole. The first roller 101 and the second roller 102 are rotatably arranged in the concave part of the first roller frame 103 through a rotating shaft. The second roller group includes a third roller 104 and a fourth roller 105 which are spaced apart from each other in the upper and lower parts. The third roller 104 and the fourth roller 105 are supported by the second roller frame.

[0038] In this embodiment, the first roller frame 103 is a fixed support, and the second roller frame is a movable support. The specific structure of the second roller frame is as follows: Figure 4 As shown, the second roller frame includes a support body 106 for mounting the third roller 104 and the fourth roller 105, and a support seat 107 for mounting the support body 106, the support seat 107 includes two symmetrically arranged connecting ears, and the support body 106 is rotatably arranged between the two connecting ears. Specifically, the left end of the support body 106 is open, and the third roller 104 and the fourth roller 105 are rotatably arranged in the concave part of the support body 106. When in use, the lens mold 100 is vertically clamped between the first roller group and the second roller group, the first roller 101 and the second roller 102 are attached to the left side of the lens mold, and the third roller 104 and the fourth roller 105 are attached to the right side of the lens mold 100, thereby forming a support.

[0039] In order to match lens molds 100 of different sizes, such as Figure 3 As shown, the first roller group and the second roller group are movably arranged on the slider 1. In this embodiment, the slider 1 uses a bidirectional cylinder, and the first roller frame 103 and the second roller frame are respectively arranged at the two telescopic ends of the bidirectional cylinder, thereby driving the first roller group and the second roller group to move closer or apart.

[0040] The moving member includes a slide bar seat 2 arranged on the machine base, and two parallel first slide bars 201 are arranged on the slide bar seat 2. The slide bar seat 2 and the first slide bars 201 form a first slide rail, and the slider 1 is passed through the first slide bar 201 so that the clamping member can move along the first slide bar 201. In another embodiment, the moving member uses a rodless cylinder, and its structure is as follows: Figure 5 As shown, the above-mentioned two-way cylinder is arranged on a rodless cylinder to drive the clamping member to move. It should be noted that the moving member is not limited to the rodless cylinder, and can also be driven by an electric push rod, a screw drive, etc.

[0041] The extrusion member includes a first extrusion disk 301 and a second extrusion disk 302 arranged opposite to each other. Figure 2 As shown, it is used to clamp the surface of the vertically arranged lens mold 100 to drive the lens mold 100 to rotate after the filling is completed. In this embodiment, the first extrusion plate 301 is arranged on the slider 1 and moves synchronously with the first roller group and the second roller group. The first extrusion plate 301 is rotatably arranged on the slider 1 through a support, and the surface of the first extrusion plate 301 is in contact with the surface of the lens mold 100. The second extrusion plate 302 is movably arranged at a position corresponding to the mold filling assembly, so that when the first roller group and the second roller group move to the mold filling assembly, they cooperate with the first extrusion plate 302 to clamp the surface of the lens mold 100.

[0042] In order to realize the rotation of the lens mold 100 to facilitate the film sealing process, the second extrusion plate 302 is connected to the rotary cylinder 303. Figure 6 As shown, the rotary cylinder 303 is slidably connected to the second slide bar 304 (the second slide bar 304 and the slide bar seat form a second slide rail), and the second slide bar 304 is vertically arranged with the first slide bar 201. Specifically, the rotary cylinder 303 of this embodiment can also be driven by a rodless cylinder. When the slider 1 drives the lens mold 100 to move to the right end of the first slide bar 201, the rotary cylinder 303 moves backward along the second slide bar 304 to the second extrusion plate 302 to squeeze the surface of the lens mold 100, thereby cooperating with the first extrusion plate 301 to form a support for the lens mold 100; when the canning is completed, the rotary cylinder 303 drives the lens mold 100 to rotate clockwise through the second extrusion plate 302. In another embodiment, in order to ensure firm clamping, the second extrusion plate 302 can also be a vacuum suction cup.

[0043] In this embodiment, if Figure 7 As shown, the mold filling assembly 200 includes: a material injection tube 4, a single material injection needle 401, a liquid level monitoring mechanism and a driving member, and the driving member and the liquid level monitoring mechanism are arranged on a bracket. The material injection tube 4 is connected to a flow control valve, and the bottom end of the material injection tube 4 is connected to a single material injection needle 401, which is an electric heating needle, used to heat the tape on the lens mold 100 to form a material injection port. The electric heating needle in this embodiment is a prior art, and its structure is not described in detail. The single material injection needle 401 in this embodiment is arranged on the left side of the liquid level sensor 402 described later; the traditional material injection needle is a double needle setting and directly needles the tape, which is not only easy to tear the material injection port when withdrawing the needle, but also causes the size of the material injection port to become larger. For this reason, the present invention sets the single material injection needle 401 as an electric heating needle, that is, the hot needle is used for needle piercing, which reduces the size of the material injection port, improves the accuracy of the shape of the material injection port, and reduces the degree of tearing of the tape, so as to reduce the generation of bubbles.

[0044] The liquid level monitoring mechanism in this embodiment is used to monitor the liquid level in the lens mold 100 to control the opening and closing and size of the flow control valve, and specifically includes a liquid level sensor 402 arranged just above the lens mold 100, and a liquid level switch arranged near the injection port of the lens mold 100, and the liquid level sensor 402 and the liquid level switch are electrically connected to the flow control valve. When the liquid level switch is a distance switch, the distance switch is arranged close to the side of the lens mold 100 that is not needled, and when the liquid level switch is a photoelectric switch, it is a cross-type structure and is arranged at the edge of the lens mold. The present invention adopts a dual sensor design, that is, the liquid level is monitored by the liquid level sensor 402 and the liquid level switch, and the flow control valve is adapted to accelerate the filling in the early stage and slow down the filling in the later stage; and an overflow design is adopted, and the resin overflow amount will have a certain amount of reflux as the single injection needle 401 is pulled out, solving the bubble problem of needle puncture. It should be noted that the liquid level switch can be a position switch or a photoelectric switch, and the liquid level sensor, position switch or photoelectric switch are all existing products, and their specific structure and working principle are no longer specifically described.

[0045] The driving member of this embodiment is used to drive the single injection needle 401 and the liquid level sensor 402 to move up and down synchronously. When the lens mold 100 moves to the bottom of the mold filling assembly, the second squeeze plate 302 first moves backward to cooperate with the first squeeze plate 301 to clamp the lens mold 100, and then the driving member drives the single injection needle 401 and the liquid level sensor 402 to move down synchronously. The single injection needle 401 pierces the tape of the lens mold 100 and enters the lens mold 100, and the bottom end of the liquid level sensor 402 is attached to the side of the lens mold 100. In this embodiment, the single injection needle 401 and the liquid level sensor 402 are driven up and down by cylinders respectively. In another embodiment, they can also be driven by one cylinder.

[0046] In order to achieve the single injection needle 401 to be inserted at different positions on the side of the lens mold 100, the injection tube 4 and the single injection needle 401 are rotatably arranged on the bracket through the mounting plate 403. The structure of the mounting plate 403 is as follows: Figure 8 As shown, a first arc groove 404 and a second arc groove 405 are formed on the mounting plate 403 at a position corresponding to the position of the injection tube 4, the arc length of the first arc groove 404 is greater than the arc length of the second arc groove 405, and the first arc groove 404 and the second arc groove 405 are concentric, and a sliding rod is provided at a position corresponding to the position of the first arc groove 404 and the second arc groove 405 on the back side of the cylinder driving the injection tube 4, the sliding rod passes through a respective arc groove and is limited by a nut to fix the cylinder, and the angle between the single injection needle 401 and the vertical plane can be adjusted by pushing the sliding rod along the sliding groove, thereby realizing needle insertion at different positions of the lens mold 100.

[0047] The film sealing assembly includes a film sticking mechanism and a film cutting mechanism. Specifically, Figure 1As shown, the film-sticking mechanism includes: a tape roll 5 with a drooping section 501, and a vertical cylinder (not shown in the figure) for controlling the up and down reciprocating movement of the tape roll 5, the tape roll 5 is rotatably arranged on a support frame, and its pulled-out end passes around a plurality of rollers arranged on the support frame and then downwardly forms a drooping section 501, the telescopic end of the vertical cylinder is connected to the support frame, and the drooping section 501 is arranged adjacent to the first roller group / the second roller group so that when the tape roll 5 moves downward, the drooping section 501 can stick to the roller of the first roller group / the second roller group. In this embodiment, when the lens mold 100 moves to the bottom of the mold filling assembly 200, the drooping section 501 is located above the second roller group. At this time, the vertical cylinder drives the support frame to move downward, and the first roller group and the second roller group move away from each other (the first roller group moves to the left, and the second roller group moves to the right. At this time, the lens mold 100 is clamped by the first extrusion disk 301 and the second extrusion disk 302), and the support body 106 tilts clockwise at a small angle. When the second roller group moves to the right, the drooping section 501 will stick to the third roller 104 of the second roller group. Then the first roller group and the second roller group are controlled to approach (the first roller group moves to the right, and the second roller group moves to the left). When the first roller group and the second roller group are close, the flow control valve is controlled to open at the same time, and the single injection needle 401 is discharged for canning.

[0048] In another embodiment, the vertical cylinder may be controlled to first drive the support frame to move downward until the drooping section 501 sticks to the surface of the third roller 104 and then the first roller group and the second roller group are controlled to move away.

[0049] The film cutting mechanism includes a horizontally arranged blade 6 for cutting the tape, and a horizontal cylinder 601 for controlling the horizontal reciprocating movement of the blade 6. When the canning is completed, the driving component first controls the single injection needle 401 and the liquid level sensor 402 to move up and return to the initial position, and then controls the rotary cylinder 303 to drive the lens mold 100 to rotate clockwise until the injection port is close to the second roller group. Because the side of the lens mold 100 is in contact with the first roller group and the second roller group, when the lens mold 100 is rotating, it will drive the third roller 104 of the second roller group to rotate, so that the drooping section 501 adhered to the third roller 104 is adhered to the side wall of the lens mold 100. At this time, the vertical cylinder drives the support frame to move up, and the drooping section 501 is stretched. Then the horizontal cylinder 601 is controlled to drive the blade 6 to move to the left, thereby cutting the tape and completing the closure of the injection port.

[0050] In order to realize the automation process, the present invention also includes a control system. It should be noted that the control system of the present invention is a conventional operation in the art, and any control system that can realize the above process is acceptable, so it will not be described in detail. The protection point of the present invention lies in the entire structure formed, not in the control.

[0051] It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A lens mold filling system, comprising: A mold filling assembly for filling resin liquid into a lens mold, characterized in that the mold filling assembly comprises: a single injection needle connected to an injection pipe provided with a flow control valve, the single injection needle being an electric heating needle for heating the tape on the lens mold to form an injection port; The liquid level monitoring mechanism is used to monitor the liquid level in the lens mold to control the opening and closing and size of the flow control valve; the liquid level monitoring mechanism adopts an overflow design, and the overflow of the resin will have a certain amount of reflux as the single injection needle is pulled out, thereby solving the bubble problem caused by needle puncture; The liquid level monitoring mechanism includes a liquid level sensor disposed directly above the lens mold, and a liquid level switch disposed adjacent to the injection port of the lens mold, wherein both the liquid level sensor and the liquid level switch are electrically connected to the flow control valve; The lens mold canning system further comprises a mold fixing assembly for supporting the upright lens mold and moving the lens mold to the mold filling assembly, wherein the mold fixing assembly comprises: a clamping member, wherein the clamping member comprises a first roller group and a second roller group arranged opposite to each other and used for clamping the side surface of the vertically arranged lens mold; The first roller assembly includes a first roller frame, the second roller assembly includes a second roller frame, the first roller frame is a fixed support, and the second roller frame is a movable support.

2. The lens mold filling system according to claim 1, characterized in that: The single injection needle and the liquid level sensor are driven to move up and down synchronously by a driving member, and the liquid level switch is a distance switch or a photoelectric switch; The mold fixing assembly also includes: A moving member, including a first slide rail, for allowing the clamping member to move to the mold filling assembly; The extrusion piece includes a first extrusion plate and a second extrusion plate which are arranged opposite to each other and are used for clamping the surface of the vertically arranged lens mold so as to drive the lens mold to rotate after the filling is completed.

3. The lens mold filling system according to claim 2, characterized in that: The first roller group and the second roller group are arranged on the sliding block relatively, and the sliding block is slidably connected to the first sliding rail.

4. The lens mold filling system according to claim 3, characterized in that: The first roller group and the second roller group are movably connected to the slider to match lens molds of different sizes.

5. The lens mold filling system according to claim 4, characterized in that: The slider is a bidirectional cylinder, which is slidably connected to the first slide rail, and the first roller group and the second roller group are arranged at two telescopic ends of the bidirectional cylinder to control the first roller group and the second roller group to move closer or farther away.

6. The lens mold filling system according to claim 3, characterized in that: The first extrusion plate is arranged on the slider to move synchronously with the clamping member, and the second extrusion plate is movably arranged at a position corresponding to the mold filling assembly to cooperate with the first extrusion plate to clamp the surface of the lens mold when the clamping member moves to the mold filling assembly.

7. The lens mold filling system according to claim 6, characterized in that: The second extrusion plate is connected to the rotary cylinder, the rotary cylinder is slidably connected to the second slide rail, and the second slide rail is vertically arranged with the first slide rail.

8. The lens mold filling system according to claim 3, characterized in that: The lens mold canning system also includes a film sealing assembly for sealing the injection port on the lens mold, the film sealing assembly includes: a film sticking mechanism, including: a tape roll with a drooping section, and a vertical cylinder for controlling the tape roll to reciprocate up and down, the drooping section is arranged adjacent to the first roller group / the second roller group so that the drooping section can be adhered to the roller of the first roller group / the second roller group when the tape roll moves downward; The film cutting mechanism comprises a horizontally arranged blade for cutting the adhesive tape, and a horizontal cylinder for controlling the horizontal reciprocating movement of the blade.

9. The lens mold filling system according to claim 8, characterized in that: The film sticking mechanism is configured as follows: when the lens mold moves to below the mold filling assembly, the drooping section is located above the first roller group / the second roller group, and the vertical cylinder drives the tape roll to move downward while the first roller group and the second roller group move away to allow the drooping section to stick to the rollers of the first roller group / the second roller group.

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