A mold for a lighting lens

Abstract

The utility model relates to lighting lens processing equipment technical field, especially a kind of mould for lighting lens, including base, die holder, tensioning assembly, piston plate and drive assembly. Cold water tank and hot water tank are provided on base, several stand columns are provided on base, and the end of stand column away from base is connected with mould cover;Die holder is slidably connected with stand column and is adapted with mould cover, forming groove and heat exchange cavity are provided on die holder;The both ends of tensioning assembly are respectively connected with base and die holder;Piston plate is slidably arranged in heat exchange cavity, to divide heat exchange cavity into chamber A and chamber B by piston plate, chamber A is communicated with the inside of hot water tank, and chamber B is communicated with the inside of cold water tank;Drive assembly is arranged on base and drives piston plate, and hot water in hot water tank is simultaneously sucked into chamber A. The utility model is preheated, cooled and mould ejection operation are completed to die holder by a group of drive assembly, simple structure, and high stability.

Description

Technical Field

[0001] This utility model relates to the field of lighting lens processing equipment, and in particular to a mold for lighting lenses. Background Technology

[0002] Injection molding of lighting lenses is a process in which molten plastic at high temperature is injected into a precision mold cavity and then cooled and solidified to form an optical element.

[0003] Existing injection molds typically only cool the mold using external circulating cooling water equipment to promote material molding, lacking a structure for preheating the mold. As a result, when the raw material is injected into the cooled molding tank, the extreme temperature difference causes the melt to cool and solidify rapidly, drastically reducing its fluidity. This leads to the melt not completely filling the cavity, resulting in material shortages or incomplete filling of thin-walled areas. Furthermore, different melt flows cannot fully fuse when they meet, forming obvious weld lines, weakening structural strength, affecting the surface finish, and adversely impacting the optical performance of lenses. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a mold for an illumination lens.

[0005] The technical solution of this utility model is as follows: A mold for an illumination lens includes a base, a cold water tank and a hot water tank are provided on the base, and a number of columns are provided on the base, with the end of the columns away from the base connected to the mold cover.

[0006] The mold base is slidably connected to the column and adapted to the mold cover. The mold base is provided with a forming groove and a heat exchange cavity.

[0007] The tensioning assembly has two ends connected to the base and the mold base, respectively, so as to push the mold base towards the mold cover through the tensioning assembly;

[0008] A piston plate is slidably disposed in the heat exchange chamber to divide the heat exchange chamber into chamber A and chamber B. Chamber A is connected to the interior of the hot water tank, and chamber B is connected to the interior of the cold water tank.

[0009] And a drive assembly, which is mounted on the base and drives the connecting piston plate. The piston plate, while sliding toward the mold cover, squeezes the cold water in chamber B back into the cold water tank, and at the same time draws the hot water in the hot water tank into chamber A.

[0010] Preferably, the cold water tank is equipped with a chiller for cooling the liquid inside, and the hot water tank is equipped with an electric heating block for heating the liquid inside.

[0011] Preferably, a vent pipe is provided on the cold water tank and communicates with its interior. The other end of the vent pipe is inserted into the hot water tank and communicates with its interior, and both ends of the vent pipe are located above the liquid surface.

[0012] Preferably, a guide pipe A is provided on the mold base, which is connected to the chamber A, and the other end of the guide pipe A is inserted into the hot water tank and located below the liquid surface.

[0013] Preferably, a guide pipe B communicating with chamber B is provided on the piston plate, and the other end of the guide pipe B is inserted into the cold water tank and located below the liquid surface.

[0014] Preferably, the tensioning assembly includes a spring A, which is sleeved on the column, and the two ends of the spring A abut against the end of the base and the mold base respectively.

[0015] Preferably, the mold base is provided with an ejector pin that is slidably connected thereto. One end of the ejector pin is inserted into the molding groove, and a positioning ring A is provided at the end of the ejector pin inserted into the molding groove, and a positioning ring B is provided at the other end. The positioning ring B is located between the base and the mold base. The end face of the positioning ring A is matched with the curvature of the inner wall of the molding groove. A spring B is sleeved on the ejector pin, and the two ends of the spring B abut against the positioning ring B and the end of the mold base that is close to it, respectively.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] By setting up a cold water tank and a hot water tank, and setting up a heat exchange chamber in the mold base, the heat exchange chamber is separated by a piston plate. The cold water tank and the hot water tank are respectively connected to the corresponding side space of the piston plate, so that the cold water and hot water can be pumped out by sliding the piston plate. By setting up a spring A to push the mold base towards the mold cover, the mold base itself can still keep in contact with the mold cover during the piston plate's return process. At the same time, cold water enters the heat exchange chamber and cools the mold base, promoting lens formation. During the mold closing process, the piston plate releases the cold water and introduces hot water, using the hot water to preheat the mold base and improve the fluidity of the raw material in the mold cavity. At the same time, this utility model also sets up an ejector pin structure to facilitate the automatic ejection of the formed lens after mold separation, realizing automatic demolding. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram showing the connection structure between the mold base and the cold water tank and hot water tank.

[0020] Figure 3 This is a schematic diagram of the connection structure of the various components on the mold base.

[0021] Reference numerals in the attached drawings: 1. Base; 2. Cold water tank; 3. Hot water tank; 4. Air duct; 5. Column; 6. Mold cover; 7. Mold base; 71. Molding groove; 72. Heat exchange chamber; 8. Spring A; 9. Ejector pin; 10. Spring B; 11. Flow guide A; 12. Piston plate; 13. Flow guide B; 14. Hydraulic cylinder; 15. Piston rod. Detailed Implementation

[0022] Example 1

[0023] like Figures 1-3 As shown, this utility model proposes a mold for an illumination lens, comprising a base 1, a mold base 7, a tensioning assembly, a piston plate 12, and a driving assembly. A cold water tank 2 and a hot water tank 3 are mounted on the base 1. Several columns 5 are mounted on the base 1, with one end of each column 5 connected to a mold cover 6 away from the base 1. A cooler for cooling the liquid inside the cold water tank 2 is mounted on the cold water tank 2, and a heating element for heating the liquid inside the hot water tank 3 is mounted on the hot water tank 3. The cooler is a semiconductor cooler, with its cold end in contact with the outer wall of the cold water tank 2, and its hot end equipped with a heat-conducting rod connected to heat dissipation fins. A heat sink is also mounted on the base 1 to assist in dissipating heat from the heat dissipation fins. The mold base 7 is slidably connected to the columns 5 and adapted to the mold cover 6. The mold base 7 is provided with a forming groove 71 and a heat exchange chamber 72. The tensioning assembly includes a spring A8, which is sleeved on the columns 5, with both ends of the spring A8 abutting against the nearest ends of the base 1 and the mold base 7, respectively. The tensioning assembly connects to the base 1 and the mold base 7 at both ends, respectively, to push the mold base 7 towards the mold cover 6. The mold base 7 is equipped with an ejector pin 9 slidably connected to it. One end of the ejector pin 9 is inserted into the molding groove 71, and a positioning ring A is attached to the end of the ejector pin 9 inserted into the molding groove 71, while a positioning ring B is attached to the other end. The positioning ring B is located between the base 1 and the mold base 7. The end face of the positioning ring A fits the curvature of the inner wall of the molding groove 71. A spring B10 is fitted on the ejector pin 9, with both ends of the spring B10 abutting against the positioning ring B and the end of the mold base 7 closest to it, respectively. A piston plate 12 is slidably disposed within the heat exchange chamber 72, dividing the heat exchange chamber 72 into chamber A and chamber B. The mold base 7 is equipped with a guide pipe A11 communicating with chamber A, and the other end of the guide pipe A11 is inserted into the hot water tank 3 below the liquid surface. A guide pipe B13 communicating with chamber B is provided on piston plate 12. The other end of guide pipe B13 is inserted into cold water tank 2 and located below the liquid surface. The drive assembly includes hydraulic cylinder 14. The body of hydraulic cylinder 14 is mounted on base 1. The output end of hydraulic cylinder 14 is connected to piston rod 15. Piston rod 15 is inserted into heat exchange chamber 72 and connected to piston plate 12. When piston plate 12 slides towards mold cover 6, it squeezes the cold water in chamber B back into cold water tank 2 and simultaneously draws hot water from hot water tank 3 into chamber A.

[0024] It should be noted that in this embodiment, the tension of spring A8 is greater than the pressure required for piston plate 12 to compress the liquid in heat exchange chamber 72.

[0025] In this embodiment, firstly, when the equipment is in the mold-opening state, the piston plate 12 is attached to the side of the heat exchange chamber 72 near the base 1, and the chamber B is filled with cold water. The mold base 7 is in a low-temperature state. During the mold-closing process, the hydraulic cylinder 14 pushes the piston rod 15, which pushes the piston plate 12. At this time, due to the tension generated by the spring A8 on the mold base 7, the mold base 7 slides towards the mold cover 6 under the action of tension. At this time, the positions of the piston plate 12 and the mold base 7 remain unchanged. After the mold base 7 and the mold cover 6 are closed, the piston plate 12 continues to move, thereby squeezing the cold water in the chamber B into the cold water tank 2. At the same time, the chamber A appears and gradually expands. The hot water in the hot water tank 3 is drawn into the chamber A under the action of negative pressure until the chamber A is completely filled and the chamber B is completely emptied. The hot water then enters the mold base 7. The process involves heating to raise the temperature, thus achieving preheating. After injection molding, the mold is separated. At this time, the hydraulic cylinder 14 pulls back the piston plate 12 through the piston rod 15. Due to the sufficient tension of the spring A8, the piston plate 12 slides first and gradually moves away from the mold cover 6. The volume of cavity A gradually decreases until it disappears, and hot water is squeezed back into the hot water tank 3. Meanwhile, cavity B appears and gradually expands. Cold water enters cavity B under negative pressure, thereby cooling the mold base 7 first and promoting the cooling and molding of the lens. Due to the change in the ratio of hot and cold water, the mold base 7 cools down at a slope. When the piston plate 12 is in contact with the side of the heat exchange cavity 72 away from the mold cover 6, the piston plate 12 drives the mold base 7 away from the mold cover 6. When the ejector pin 9 contacts the base 1, the ejector pin 9 pushes the lens out of the molding groove 71, achieving automatic demolding.

[0026] Example 2

[0027] like Figure 1 and Figure 2 As shown, the mold for an illumination lens proposed in this utility model, compared with Embodiment 1, has a vent pipe 4 connected to the interior of the cold water tank 2, and the other end of the vent pipe 4 is inserted into the hot water tank 3 and connected to the interior of the hot water tank 3, and both ends of the vent pipe 4 are located above the liquid surface.

[0028] In this embodiment, when the piston plate 12 squeezes the chamber B, the cold water in the chamber B enters the cold water tank 2. At the same time, the air squeezed out of the cold water tank 2 enters the hot water tank 3 along the air guide pipe 4, thereby increasing the pressure in the hot water tank 3. The hot water in the hot water tank 3 enters the chamber A more smoothly under the combined action of the piston 12's upward suction and the gas pressure. Conversely, it will also promote the entry of cold water in the cold water tank 2 into the chamber B.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A mold for an illumination lens, characterized in that, include: A base (1) is provided with a cold water tank (2) and a hot water tank (3). Several columns (5) are provided on the base (1). The end of the column (5) away from the base (1) is connected to the mold cover (6). The mold base (7) is slidably connected to the column (5) and adapted to the mold cover (6). The mold base (7) is provided with a forming groove (71) and a heat exchange cavity (72). The tensioning assembly has two ends connected to the base (1) and the mold base (7) respectively, so as to push the mold base (7) towards the mold cover (6) through the tensioning assembly; Piston plate (12) is slidably disposed in heat exchange chamber (72) to divide heat exchange chamber (72) into chamber A and chamber B. Chamber A is connected to the interior of hot water tank (3) and chamber B is connected to the interior of cold water tank (2). And a drive assembly, which is set on the base (1) and drives the connecting piston plate (12). The piston plate (12) slides towards the mold cover (6) to squeeze the cold water in the chamber B back into the cold water tank (2) and at the same time sucks the hot water in the hot water tank (3) into the chamber A.

2. The mold for an illumination lens according to claim 1, characterized in that, A chiller is installed on the cold water tank (2) to cool the liquid inside it, and an electric heating block is installed on the hot water tank (3) to heat the liquid inside it.

3. The mold for an illumination lens according to claim 1, characterized in that, A vent pipe (4) is installed on the cold water tank (2) and communicates with its interior. The other end of the vent pipe (4) is inserted into the hot water tank (3) and communicates with its interior. Both ends of the vent pipe (4) are located above the liquid surface.

4. The mold for an illumination lens according to claim 1, characterized in that, A guide pipe A (11) connected to the chamber A is provided on the mold base (7), and the other end of the guide pipe A (11) is inserted into the hot water tank (3) and located below the liquid surface.

5. A mold for an illumination lens according to claim 1, characterized in that, A guide pipe B (13) communicating with the chamber B is provided on the piston plate (12). The other end of the guide pipe B (13) is inserted into the cold water tank (2) and located below the liquid surface.

6. A mold for an illumination lens according to claim 1, characterized in that, The tensioning assembly includes a spring A (8), which is sleeved on the column (5). The two ends of the spring A (8) abut against the base (1) and the mold base (7) respectively.

7. The mold for an illumination lens according to claim 1, characterized in that, A ejector pin (9) is provided on the mold base (7) and is slidably connected thereto. One end of the ejector pin (9) is inserted into the molding groove (71), and a positioning ring A is provided at one end of the ejector pin (9) inserted into the molding groove (71), and a positioning ring B is provided at the other end. The positioning ring B is located between the base (1) and the mold base (7). The end face of the positioning ring A is in line with the arc of the inner wall of the molding groove (71). A spring B (10) is sleeved on the ejector pin (9), and the two ends of the spring B (10) abut against the positioning ring B and the end of the mold base (7) that is close to it, respectively.

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