A lampshade production and processing mold facilitating mold opening

Abstract

This invention discloses a mold for manufacturing lamp shades that facilitates mold opening, relating to the field of lamp shade injection molding technology. The mold includes a concave mold and a convex mold, which are vertically separated. Each mold consists of an outer metal shell and an inner ventilated steel layer, with a cavity between them. The cavities in the concave and convex molds are interconnected. An injection tube is located in the center of the convex mold, positioned above and inside the mold. An air injection pipe is located on one side of the convex mold, with one end connected to an air pump. The air injection pipe is connected to the cavity. An electric heating system and a water cooling system are installed inside the concave and convex molds. By using ventilated steel as the molding cavity, combined with a negative pressure mechanism and a pressure holding mechanism, this invention ensures that the molten plastic fills the entire molding cavity during molding, thereby improving the yield rate of lamp shade production.

Description

Technical Field

[0001] This invention relates to the field of lampshade injection molding production technology, specifically to a mold for the production and processing of table lamp shades that is easy to open. Background Technology

[0002] Table lamps, as common lighting tools in daily life, are not only practical but also decorative. The design and manufacture of table lamps involve multiple aspects, among which the design of the injection mold for the lampshade is a crucial step in ensuring product quality and production efficiency. With the development of manufacturing technology, mold making has shifted from traditional manual manufacturing to CNC machining and rapid prototyping technologies. The application of these technologies has greatly improved the manufacturing precision and production efficiency of molds.

[0003] During the injection molding process of lampshades, if the air inside the molten plastic or molding cavity cannot be removed in time, the air bubbles inside will be compressed during the holding pressure molding process. After molding, the air bubbles will expand at room temperature, causing depressions on the surface of the injection molded parts and reducing the yield. Summary of the Invention

[0004] The purpose of this invention is to provide a mold for the production and processing of table lamp shades that is easy to open, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a mold for the production and processing of a table lamp shade that is easy to open, the mold including a concave mold and a convex mold, the concave mold and the convex mold adopt a vertical separation mode, the concave mold and the convex mold are composed of an outer metal shell and an inner ventilated steel, there is a cavity between the metal shell and the ventilated steel, the cavities in the concave mold and the convex mold are connected, and an injection tube is provided in the middle of the convex mold, the injection tube is located inside the upper part of the convex mold;

[0006] An air injection pipe is provided on one side of the punch, and one end of the air injection pipe is connected to an air pump. The air injection pipe is connected to the cavity. An electric heating system and a water cooling system are provided inside the die and the punch.

[0007] The die and punch are closed under the action of the hydraulic mechanism of the injection molding machine. The punch is fixedly connected to the injection molding machine, and the die is connected to the output end of the hydraulic mechanism. Under the action of the hydraulic structure, the die moves from top to bottom until the die and punch are tightly connected. The inner layer of the die and punch is made of ventilated steel to form the molding cavity. There is a cavity between the outer metal shell and the ventilated steel. The cavity is connected to the water cooling system. The connection between the cavities inside the die and punch is an interlocking connection, and the contact surface is equipped with a sealing strip.

[0008] After the cavity and punch are combined, the injection molding machine injects the heated and molten plastic into the molding cavity through the injection tube. Since the injection tube is located inside the cavity and above, the molten plastic fills the molding cavity under the action of gravity and injection pressure. During the injection of the molten plastic, the air pump on one side of the mold is started simultaneously. The air pump is connected to the cavity through a pipe. During the operation of the air pump, the cavity is kept in a low-pressure state.

[0009] During the injection of molten plastic, because the output end of the injection tube is located inside and above the molding cavity, air bubbles inside the molten plastic enter the cavity through the vent steel under the action of negative pressure while the molten plastic fills the molding cavity. Finally, they leave under the action of the air pump. At the same time, the position of the output port of the injection tube is set so that when the molten plastic first enters the molding cavity, the air bubbles inside the molten plastic directly overflow under the action of negative pressure. Then, under the action of gravity and injection pressure, they flow to the surrounding areas. The purpose of the position of the output port of the injection tube is to prevent the air bubbles inside the molten plastic from moving upward from the bottom of the molding cavity. After the molten plastic enters the molding cavity, it is quickly removed under the action of negative pressure, shortening the movement path of the air bubbles.

[0010] During the injection of molten plastic, the electric heating system is activated simultaneously. The electric heating system includes heating wires set on the outside of the ventilated steel. The heating wires are waterproofed, or the heating wires are set in the internal interlayer of the ventilated steel. During the operation of the heating wires, the molten plastic is heated to ensure the fluidity of the molten plastic during injection molding. At the same time, the cavity is in a negative pressure state to reduce heat loss.

[0011] After the molten plastic is injected, the heating wire stops working, and then the water cooling system cools the molten plastic. After cooling and solidification, the molten plastic forms the lampshade. Finally, under the control of the hydraulic mechanism, the concave mold and convex mold are separated, and with the help of the auxiliary robotic arm, the formed lampshade is taken out.

[0012] Furthermore, a circular through hole is provided in the middle of the punch, the injection tube is located in the middle of the through hole, a piston plate is installed on the outside of the injection tube, a circular hole matching the injection tube is provided in the middle of the piston plate, the piston plate is slidably connected to the punch, the piston plate is connected to the punch through a drive rod, and a pressure monitoring element is provided inside the output end of the drive rod.

[0013] The piston plate and the punch are slidably connected. Driven by the drive rod, the piston plate moves up and down relative to the punch. After the injection tube injects a specified volume of molten plastic, the molten plastic does not completely fill the entire molding cavity. After the injection tube finishes the injection, the control center inside the injection molding machine sends a control command to the drive rod. The drive rod drives the piston plate to rise relative to the punch and the injection tube until the upper surface of the piston plate coincides with the upper surface of the punch. The piston plate and drive rod are designed to maintain pressure during the cooling and molding of the molten plastic.

[0014] The drive rod is electrically connected to the control center. During operation, the drive rod feeds back the holding pressure to the control center. When the drive rod controls the piston plate to rise to the designated position, if the pressure monitoring element inside the drive rod detects that the pressure is less than the holding pressure, the control center can feed back the pressure value to determine that the output volume of molten plastic in the injection tube is too small. Conversely, if the pressure monitoring element inside the drive rod detects that the pressure is less than the holding pressure, or if the pressure monitoring element has detected that the pressure value exceeds the holding pressure value during the piston plate's rise, it indicates that the output volume of molten plastic in the injection tube is too large. The operator can then actively adjust the input amount of molten plastic in a single injection based on the feedback value.

[0015] Furthermore, a stop plate is provided above the middle part of the piston plate. The stop plate is connected to the injection tube by a spring. The stop plate is in the shape of an inverted frustum. The lower end surface structure of the stop plate matches the inner wall surface structure of the circular hole.

[0016] During the upward movement of the piston plate, the stop plate is connected to the injection tube via a spring. The injection tube is stationary during injection. Under the action of the spring, the stop plate and the piston plate overlap. Then, the piston plate continues to rise under the action of the drive rod until the upper surface of the piston plate overlaps with the upper surface of the punch. Since the stop plate is shaped like an inverted frustum, after the stop plate and the piston plate have overlapped, the piston plate drives the stop plate to continue rising. Finally, the piston plate and the stop plate, together with the die and the punch, form a complete molding cavity.

[0017] The function of the stop plate is to maintain pressure on the molten plastic in the molding cavity after the molten plastic is injected. Under high pressure, the stop plate and piston plate isolate the molding cavity from the injection tube to prevent the molten plastic from flowing back into the injection tube under high pressure, and to prevent the injection nozzle from appearing at the injection tube.

[0018] Furthermore, the water cooling system includes a water pump and a control valve, the control valve being located below one side of the punch and connected to the cavity;

[0019] The cavity is equipped with a connecting pipe, which is U-shaped and connected to the water pump via a ring guide rail.

[0020] After injection molding, the heating system is turned off, and the water cooling system starts working. The water pump injects cooling water into the cavity through the connecting pipe, causing the water level inside the cavity to rise until the entire cavity is filled with cooling water. During the cooling water input, the control valve opens synchronously, with the output of the control valve being less than the input of the water pump. Because the connecting pipe is U-shaped, the output point of the connecting pipe is located at the top inside the cavity. During the cooling process, the water temperature at the top is slightly lower than the water temperature at the bottom. The water injection inside the cavity allows the lampshade to cool and form from bottom to top. Combined with the pressure holding mechanism, this prevents defects in the plastic from occurring during the cooling process.

[0021] Furthermore, several connecting pipes are provided, and an annular guide rail is provided between the connecting pipe and the lower inner wall of the punch. The connecting pipe and the annular guide rail are slidably connected, and a water outlet is provided on one side of the connecting pipe.

[0022] During the output of cooling water, the connecting pipe is slidably connected to the annular guide rail, which is a hollow structure. The annular guide rail is connected to the water pump and the connecting pipe. An outlet is opened on one side of the connecting pipe, and the direction of the outlet is tangential to the annular guide rail. During the output of cooling water, the connecting pipe rotates around the central axis of the annular guide rail under the push of the reverse force. During the rotation of the connecting pipe, the cooling water inside the cavity moves, preventing the water temperature on the side closer to the control valve from being lower than the water temperature on the side farther from the control valve.

[0023] Furthermore, two blades are provided on the outer side of each of the connecting pipes. The outer blades are connected to the connecting pipes via spring shafts. A limiting groove is provided at the connection between the blades and the connecting pipes. The limiting groove is used to limit the deflection angle of the blades relative to the connecting pipes.

[0024] The impeller design further improves the flow effect of water inside the cavity of the connecting pipe. Impellers are installed above both ends of the connecting pipe, with the two impellers located in the cavities inside the die and punch respectively. The outer impeller is located in the cavity inside the die. The outer impeller is connected to the connecting pipe by a spring, allowing the die and punch to actively deflect under the action of the spring shaft during separation and mold closing. The impeller can detach and insert through the gap between the metal shell and the venting steel inside the die. Secondly, a limiting groove is provided between the outer impeller and the connecting pipe. The limiting groove is designed to prevent the outer impeller from deflecting excessively during the flow of cooling water, which would cause the impeller to coincide with the tangential direction of the annular guide rail and affect the impeller's disturbance of the cooling water.

[0025] Meanwhile, the blades are made of flexible material. The material properties of the blades enable them to drive the cooling water inside the cavity to move during movement. At the same time, during mold parting and mold closing, the blades deform after contacting the inner wall of the mold cavity, thereby enabling the outer blades to enter and exit the cavity of the mold cavity.

[0026] Furthermore, movable telescopic sleeves are provided above both ends of the connecting pipe, and a float plate is provided at the upper end of the sleeve. An opening is provided on one side of the float plate, and the float plate is connected to the connecting pipe through the sleeve.

[0027] The upper structure of the connecting pipe consists of a sleeve and a float plate. The float plate, together with the sleeve that can extend and retract, ensures that the float plate is always on the surface of the cooling water. During the pumping of cooling water into the cavity, the cooling water does not need to fall from the top of the cavity, making the cooling water injection process smoother and avoiding noise caused by the drop.

[0028] Furthermore, the air pump is connected to the annular guide rail via an air injection pipe, and the air injection pipe is connected to the cavity via a connecting pipe and the annular guide rail. The air pump and the control valve are electrically connected.

[0029] Before demolding, an air pump injects air into the cavity through an air injection pipe, a connecting pipe, and a ring guide rail. As the air pressure inside the cavity increases, the cooling water flow is constantly controlled by a control valve, causing the water level inside the cavity to drop. Some air enters the molding cavity through the ventilated steel, achieving separation of the cooled and molded lampshade from the molding cavity. Since the channels inside the ventilated steel can only allow air to pass through, water flow and molten plastic cannot. As air is injected into the cavity, the cooling and molded lampshade separates from the molding cavity as the water level continues to drop. During the separation process, the molded lampshade separates from the mold from top to bottom, avoiding tearing in weak areas of the lampshade due to direct separation from the mold as a whole, thus improving the demolding effect.

[0030] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0031] By using breathable steel as the molding cavity of the mold and creating a negative pressure space outside the molding cavity, air bubbles in the molding cavity and in the molten plastic can be actively extracted during the injection of molten plastic. At the same time, the position of the injection tube can be adjusted to accelerate the overflow of air bubbles inside the molten plastic.

[0032] The cavity, combined with the electric heating system and water cooling system, prevents the molten plastic from developing depressions on the surface of the finished product due to shrinkage during cooling, thanks to the piston plate and its connected mechanism. At the same time, the internal mechanism of the mold adopts gradual cooling and separation, so that the finished lampshade can be completely separated during demolding. Attached Figure Description

[0033] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0034] Figure 1 This is a front view full sectional structural diagram of the present invention;

[0035] Figure 2 This is the invention Figure 1 Enlarged structural diagram at point A in the middle;

[0036] Figure 3 This is the invention Figure 1 Enlarged structural diagram at point B;

[0037] Figure 4 This is a schematic diagram of the main structure of the internal mechanism of the die of the present invention;

[0038] Figure 5 This is a three-dimensional structural diagram of the internal mechanism of the die of the present invention;

[0039] Figure 6 This is a schematic diagram of the bottom three-dimensional structure of the internal mechanism of the concave mold of the present invention;

[0040] Figure 7 This is a top-view full sectional structural diagram of the present invention;

[0041] Figure 8 This is a three-dimensional structural diagram of the water cooling system of the present invention;

[0042] Figure 9 This is a schematic diagram of the sleeve and its connected structure of the present invention.

[0043] In the diagram: 1. Cavity; 2. Punch; 3. Cavity; 4. Injection tube; 5. Air injection tube; 6. Piston plate; 601. Stop plate; 7. Control valve; 8. Connecting pipe; 801. Circular guide rail; 802. Blade; 9. Sleeve; 901. Float plate. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Please see Figures 1-9 The present invention provides a technical solution: a mold for the production and processing of a table lamp shade that is easy to open. The mold includes a concave mold 1 and a convex mold 2. The concave mold 1 and the convex mold 2 adopt a vertical separation mode. The concave mold 1 and the convex mold 2 are composed of an outer metal shell and an inner breathable steel. There is a cavity 3 between the metal shell and the breathable steel. The cavities 3 in the concave mold 1 and the convex mold 2 are connected. An injection tube 4 is provided in the middle of the convex mold 2. The injection tube 4 is located inside the upper part of the convex mold 2.

[0046] A circular through hole is provided in the middle of the punch 2, the injection tube 4 is located in the middle of the through hole, and a piston plate 6 is installed on the outside of the injection tube 4. A circular hole matching the injection tube 4 is provided in the middle of the piston plate 6. The piston plate 6 is slidably connected to the punch 2. The piston plate 6 is connected to the punch 2 through a drive rod. A pressure monitoring element is provided inside the output end of the drive rod.

[0047] A stop plate 601 is provided above the middle part of the piston plate 6. The stop plate 601 is connected to the injection tube 4 by a spring. The stop plate 601 is in the shape of an inverted frustum. The surface structure of the lower end of the stop plate 601 matches the surface structure of the inner wall of the circular hole.

[0048] By using breathable steel as the molding cavity of the mold and creating a negative pressure space outside the molding cavity, air bubbles in the molding cavity and in the molten plastic are actively extracted during the injection of molten plastic. At the same time, the position setting of the injection tube 4 accelerates the overflow of air bubbles inside the molten plastic.

[0049] The die 1 and the punch 2 are equipped with an electric heating system and a water cooling system. The water cooling system includes a water pump and a control valve 7. The control valve 7 is located on one side below the punch 2 and is connected to the cavity 3.

[0050] The cavity 3 is provided with a connecting pipe 8. The connecting pipe 8 is U-shaped and is connected to the water pump through an annular guide rail 801. There are several connecting pipes 8. An annular guide rail 801 is provided between the connecting pipe 8 and the lower inner wall of the punch 2. The connecting pipe 8 and the annular guide rail 801 are slidably connected. A water outlet is opened on one side of the connecting pipe 8.

[0051] The annular guide rail 801 includes two concentric rings mounted on the end face of the cavity 3. The cross-section of the rings is "L" shaped. An annular end plate is slidably mounted between the two rings. A pipe is mounted on the end plate and the pipe is connected to the inside of the connecting pipe 8. The two rings and the end plate cooperate with each other to form a hollow structure.

[0052] Two blades 802 are provided on the outer side of a single connecting pipe 8. The outer blades 802 are connected to the connecting pipe 8 by a spring shaft. A limiting groove is provided at the connection between the blades 802 and the connecting pipe 8. The limiting groove is used to limit the deflection angle of the blades 802 relative to the connecting pipe 8.

[0053] The connecting pipe 8 is provided with movable telescopic sleeves 9 at both ends. A float plate 901 is provided at the upper end of the sleeve 9. An opening is provided on one side of the float plate 901. The float plate 901 is connected to the connecting pipe 8 through the sleeve 9.

[0054] A gas injection pipe 5 is provided on one side of the punch 2. One end of the gas injection pipe 5 is connected to a gas pump. The gas pump is connected to the annular guide rail 801 through the gas injection pipe 5. The gas injection pipe 5 is connected to the cavity 3 through the connecting pipe 8 and the annular guide rail 801. The gas pump and the control valve 7 are electrically connected.

[0055] The cavity 3, in conjunction with the electric heating system and the water cooling system, under the action of the piston plate 6 and its connected mechanism, prevents the molten plastic from shrinking during cooling, thus avoiding surface depressions in the finished product. At the same time, the internal mechanism of the mold adopts gradual cooling and separation, so that the finished lampshade can be completely separated during demolding.

[0056] Working principle of the invention:

[0057] The die 1 and the punch 2 are closed under the action of the hydraulic mechanism of the injection molding machine. The punch 1 is fixedly connected to the injection molding machine, and the die 1 is connected to the output end of the hydraulic mechanism. Under the action of the hydraulic structure, the die 1 moves from top to bottom until the die 1 and the punch 2 are tightly connected. The inner layer of the die 1 and the punch 2 is made of ventilated steel to form the molding cavity. There is a cavity 3 between the outer metal shell and the ventilated steel. The cavity 3 is connected to the water cooling system. The connection of the cavity 3 inside the die 1 and the punch 2 is an interlocking connection, and a sealing strip is installed on the contact surface.

[0058] After the concave mold 1 and the convex mold 2 are combined, the injection molding machine injects the heated and molten plastic into the molding cavity through the injection tube 4. Since the injection tube 4 is located inside the upper part of the concave mold 2, the molten plastic fills the molding cavity under the action of gravity and injection pressure. During the injection of the molten plastic, the air pump on one side of the mold is started simultaneously. The air pump is connected to the cavity 3 through the air injection pipe 5, the connecting pipe 8 and the annular guide rail 801. During the operation of the air pump, the cavity 3 is in a low-pressure state.

[0059] During the injection of molten plastic, since the output end of the injection tube 4 is located inside and above the molding cavity, as the molten plastic fills the molding cavity, the air bubbles inside the molten plastic enter the cavity 3 through the vent steel under the action of negative pressure, and finally leave under the action of the air pump. At the same time, the position of the output port of the injection tube 4 is set so that when the molten plastic first enters the molding cavity, the air bubbles inside the molten plastic directly overflow under the action of negative pressure, and then flow to the surroundings under the action of gravity and injection pressure. The purpose of the position of the output port of the injection tube 4 is to prevent the air bubbles inside the molten plastic from moving upward from the bottom of the molding cavity. After the molten plastic enters the molding cavity, it is quickly removed under the action of negative pressure, shortening the movement path of the air bubbles.

[0060] During the injection of molten plastic, the electric heating system is activated simultaneously. The electric heating system includes heating wires set on the outside of the ventilated steel. The heating wires are waterproofed, or the heating wires are set in the internal interlayer of the ventilated steel. During the operation of the heating wires, the molten plastic is heated to ensure the fluidity of the molten plastic during injection molding. At the same time, it is combined with the negative pressure cavity 3 to reduce heat loss.

[0061] After the molten plastic is injected, the heating wire stops working, and then the water cooling system cools the molten plastic. After cooling and solidification, the molten plastic forms a lampshade. Finally, under the control of the hydraulic mechanism, the concave mold 1 and the convex mold 2 are separated, and with the help of the auxiliary robotic arm, the formed lampshade is taken out.

[0062] The piston plate 6 is slidably connected to the punch 2. Driven by the drive rod, the piston plate 6 is controlled to move up and down relative to the punch 2. After the injection tube 4 injects a specified volume of molten plastic, the molten plastic does not completely fill the entire molding cavity. After the injection tube 4 completes the injection, the control center inside the injection molding machine sends a control command to the drive rod. The drive rod drives the piston plate 6 to rise relative to the punch 2 and the injection tube 4 until the upper surface of the piston plate 6 coincides with the upper surface of the punch 2. The piston plate 6 and the drive rod are set to maintain pressure during the cooling and molding of the molten plastic.

[0063] The drive rod is electrically connected to the control center. During operation, the drive rod will feed back the holding pressure to the control center. When the drive rod controls the piston plate 6 to rise to the designated position, if the pressure monitoring element inside the drive rod detects that the pressure is less than the holding pressure, the control center can feed back the pressure value to determine that the output volume of molten plastic in the injection tube 4 is small. Conversely, if the pressure monitoring element inside the drive rod detects that the pressure is less than the holding pressure, or if the pressure monitoring element has detected that the pressure value exceeds the holding pressure value during the rise of the piston plate 6, it indicates that the output volume of molten plastic in the injection tube 4 is too large. The operator can actively adjust the input amount of molten plastic in a single injection based on the feedback value.

[0064] During the upward movement of the piston plate 6, the stop plate 601 is connected to the injection tube 4 via a spring. The injection tube 4 is stationary during injection. Under the action of the spring, the stop plate 601 overlaps with the piston plate 6. Subsequently, the piston plate 6 continues to rise under the action of the drive rod until the upper surface of the piston plate 6 overlaps with the upper surface of the punch 2. Since the stop plate 601 is in the shape of an inverted frustum, after the stop plate 601 and the piston plate 6 have completed their overlap, the piston plate 6 drives the stop plate 601 to continue to rise. Finally, the piston plate 6 and the stop plate 601, together with the die 1 and the punch 2, form a complete molding cavity.

[0065] The function of the stop plate 601 is to, after the molten plastic is injected, use the control rod and piston plate 6 to maintain pressure on the molten plastic in the molding cavity. Under high pressure, the stop plate 601 and piston plate 6 isolate the molding cavity from the injection tube 4, so as to prevent the molten plastic from flowing back into the injection tube 4 under high pressure, and at the same time prevent the injection nozzle from appearing at the injection tube 4.

[0066] After injection molding, the electric heating system is turned off, and the water cooling system starts working. The water pump injects cooling water into the cavity 3 through the connecting pipe 8, causing the water level inside the cavity 3 to rise until the cooling water fills the entire cavity 3. During the input of cooling water, the control valve 7 opens synchronously. The output of the control valve 7 is less than the input of the water pump. Since the connecting pipe 8 is U-shaped, the output point of the connecting pipe 8 is located at the top inside the cavity 3. During the cooling process, the water temperature at the top is slightly lower than the water temperature at the bottom. At the same time, the water injection setting inside the cavity 3 allows the lampshade to cool and form from bottom to top. With the help of the pressure holding mechanism, defects in the plastic are prevented during the cooling process.

[0067] During the output of cooling water, the connecting pipe 8 is slidably connected to the annular guide rail 801. The annular guide rail 801 is a hollow structure and is connected to the water pump and the connecting pipe 8. An outlet is opened on one side of the connecting pipe 8, and the direction of the outlet is the tangent direction of the annular guide rail 801. During the output of cooling water, the connecting pipe 8 rotates around the central axis of the annular guide rail 801 under the push of the reverse force. During the rotation of the connecting pipe 8, the cooling water inside the cavity 3 moves, so as to prevent the water temperature on the side closer to the control valve 7 from being lower than the water temperature on the side farther away from the control valve 7.

[0068] The impeller 802 further improves the flow effect of water inside the cavity 3 of the connecting pipe 8. Impellers 802 are installed above both ends of the connecting pipe 8, with the two impellers 802 located in the cavities 3 inside the die 1 and punch 2 respectively. The outer impeller 802 is located in the cavity 3 inside the die 1. The outer impeller 802 is connected to the connecting pipe 8 by a spring, allowing the die 1 and punch 2 to actively deflect under the action of the spring shaft during separation and closing. The impeller 802 can disengage and insert through the gap between the metal shell and the venting steel inside the die 1. Furthermore, a limiting groove is provided between the outer impeller 802 and the connecting pipe 8. The limiting groove prevents the outer impeller 802 from excessively deflecting during the flow of cooling water, thus avoiding the impeller 802 coinciding with the tangential direction of the annular guide rail 801 and affecting the disturbance of the cooling water by the impeller 802.

[0069] The upper structure of the connecting pipe 8 is a sleeve 9 and a float 901. The float 901, together with the sleeve 9 which can extend and retract, ensures that the float 901 is always on the surface of the cooling water. During the pumping of cooling water into the cavity 3, the cooling water does not need to fall from the top of the cavity 3, making the cooling water injection process smoother and avoiding noise caused by the drop.

[0070] Before demolding, the air pump injects air into the cavity 3 through the air injection pipe 5, connecting pipe 8, and annular guide rail 801. As the air pressure inside the cavity 3 increases, the cooling water flow rate is constantly controlled by the control valve 7, causing the water level inside the cavity 3 to drop. Some air enters the molding cavity through the ventilated steel, achieving the separation of the cooled and molded lampshade from the molding cavity. Since the channels inside the ventilated steel can only allow air to pass through, water flow and molten plastic cannot pass through. As air is injected into the cavity 3, the water level inside the cavity 3 continues to drop, achieving the separation of the cooled and molded lampshade from the molding cavity. During the separation process, the molded lampshade separates from the mold from top to bottom, avoiding tearing of weak areas of the lampshade due to direct separation from the mold as a whole, thus improving the demolding effect.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0072] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mold for manufacturing and processing table lamp shades that is easy to open, characterized in that: The mold includes a concave mold (1) and a convex mold (2). The concave mold (1) and the convex mold (2) are vertically separated. The concave mold (1) and the convex mold (2) are composed of an outer metal shell and an inner ventilated steel. There is a cavity (3) between the metal shell and the ventilated steel. The cavities (3) in the concave mold (1) and the convex mold (2) are connected. An injection tube (4) is provided in the middle of the convex mold (2). The injection tube (4) is located inside the convex mold (2) at the top. An air injection pipe (5) is provided on one side of the punch (2), and one end of the air injection pipe (5) is connected to an air pump. The air injection pipe (5) is connected to the cavity (3). An electric heating system and a water cooling system are provided inside the die (1) and the punch (2). The water cooling system includes a water pump and a control valve (7). The control valve (7) is located below one side of the punch (2) and is connected to the cavity (3). The cavity (3) is provided with a connecting pipe (8), which is U-shaped and is connected to the water pump through an annular guide rail (801). The connecting pipe (8) is provided in several ways. An annular guide rail (801) is provided between the connecting pipe (8) and the lower inner wall of the punch (2). The connecting pipe (8) and the annular guide rail (801) are slidably connected. A water outlet is provided on one side of the connecting pipe (8). Two blades (802) are provided on the outer side of a single connecting pipe (8). The outer blades (802) are connected to the connecting pipe (8) by a spring shaft. A limiting groove is provided at the connection between the blades (802) and the connecting pipe (8). The limiting groove is used to limit the deflection angle of the blades (802) relative to the connecting pipe (8). The connecting pipe (8) is provided with movable telescopic sleeves (9) at both ends. A float plate (901) is provided at the upper end of the sleeve (9). An opening is provided on one side of the float plate (901). The float plate (901) is connected to the connecting pipe (8) through the sleeve (9). The air pump is connected to the annular guide rail (801) through the air injection pipe (5), and the air pump and the control valve (7) are electrically connected.

2. The mold for producing and processing a table lamp shade that is easy to open, as described in claim 1, is characterized in that: The punch (2) has a circular through hole in the middle, the injection tube (4) is located in the middle of the through hole, and a piston plate (6) is installed on the outside of the injection tube (4). The piston plate (6) has a circular hole in the middle that matches the injection tube (4). The piston plate (6) is slidably connected to the punch (2). The piston plate (6) is connected to the punch (2) through a drive rod. A pressure monitoring element is provided inside the output end of the drive rod.

3. The mold for producing and processing a table lamp shade that is easy to open, as described in claim 2, is characterized in that: A stop plate (601) is provided above the middle part of the piston plate (6). The stop plate (601) is connected to the injection tube (4) by a spring. The stop plate (601) is in the shape of an inverted frustum. The lower end surface structure of the stop plate (601) matches the inner wall surface structure of the circular hole.

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