Blow molding device

Abstract

The utility model discloses a blow molding device which comprises a supporting frame, a raw material box arranged on the supporting frame and a feeding table connected with the raw material box, a working table and a lifting air cylinder are arranged at the bottom of the feeding table, the feeding table is provided with a feeding rod, and a left mold, a right mold and an opening and closing air cylinder used for driving the left mold and the right mold to be opened and closed are arranged at the bottom of the working table in a sliding mode. Cooling assemblies are arranged on the left mold and the right mold, and each cooling assembly comprises a water inlet pipe, a communicating groove formed in the workbench and a cooling pipe formed in the left mold and the right mold; and a water flow switch is arranged between the cooling pipe and the communicating groove. Therefore, the temperature difference between the mold and a heated raw material is increased. In the blow molding process, plastic is attached to the mold, a plastic bottle can be subjected to rapid heat exchange, and therefore a product can be cooled and molded more rapidly, the cooling and curing time can be shortened through the mode, and the blow molding efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of plastics processing, and in particular to a blow molding apparatus. Background Technology

[0002] Blow molding is a plastics processing technique primarily used to produce hollow plastic products such as plastic bottles, cans, containers, toys, and other industrial products. The process involves extruding molten plastic into a tubular shape (preform), then expanding it with compressed air and fitting it into the interior of a mold to ultimately form the desired product shape.

[0003] After blow molding, the plastic formed in the mold needs to be cooled and cured before demolding. Cooling and curing takes a certain amount of time. If demolded prematurely, the plastic bottle is still relatively hot and soft, which can easily cause it to stick to one of the molds or result in substandard product quality. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a blow molding device that can shorten the cooling and curing time, thereby improving blow molding efficiency.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] A blow molding apparatus includes a support frame, a raw material bin mounted on the support frame, and a feeding platform connected to the raw material bin. A worktable and a lifting cylinder for driving the worktable to move up and down are provided at the bottom of the feeding platform. A feeding rod is provided on the feeding platform. A left mold and a right mold are slidably mounted at the bottom of the worktable, and an opening / closing cylinder for driving the left and right molds to open and close. Cooling components are provided on the left and right molds. The cooling components include a water inlet pipe mounted on the worktable, a connecting groove formed in the worktable, and cooling pipes formed in the left and right molds. The water inlet pipe communicates with the connecting groove, and a flow switch is provided between the cooling pipes and the connecting groove.

[0007] Preferably, the water flow switch includes a switch slot, a switch plate slidably disposed in the switch slot, and a switch spring disposed in the switch slot; the switch plate has a connecting hole; the connecting hole is located between the connecting slot and the cooling pipe or the switch plate is located between the connecting slot and the cooling pipe; a linkage plate is also fixed at one end of the switch plate, and the linkage plate is located on the moving path of the left mold and the right mold.

[0008] Preferably, the end of the cooling pipe away from the water inlet pipe is connected to a water outlet pipe, the water inlet pipe is connected to a water source, and the water outlet pipe is also connected to a water source.

[0009] Preferably, the feeding platform has a cavity, and an extrusion plate is slidably disposed in the cavity, dividing the cavity into a pressure chamber and a filling chamber; the pressure chamber is provided with an extrusion spring for pushing the extrusion plate downward; the raw material box has a feeding channel, which communicates with the filling chamber, and the bottom of the filling chamber has a discharge port; the worktable has a feeding port, which is located directly below the discharge port; the feeding rod is located at the feeding port and blocks the discharge port; the worktable is provided with a discharge assembly that can push the feeding rod and open the feeding port.

[0010] Preferably, the discharge assembly includes a lifting rod, which is disposed at the abutment portion of the lifting rod, and the abutment portion is located directly below the feeding rod; the lifting rod is slidably connected to the worktable, the lifting rod is provided with a rack groove, and the worktable is fixed with a motor, the output end of which is provided with a gear that meshes with the rack groove.

[0011] Preferably, the feeding platform is further provided with a blow molding assembly, which includes a blow molding pump and a blow molding tube connected to the blow molding pump. The blow molding tube is connected to the feeding rod, and the feeding rod has a blow molding hole inside that communicates with the blow molding tube.

[0012] Preferably, the worktable is further provided with a shearing assembly, which includes a slide groove formed on the worktable, a slider symmetrically arranged on the slide groove, an arc surface on the slider, a cutting groove on the slider, a cutter slidably arranged on the cutting groove, and a cutting spring arranged on the cutting groove for maintaining the thrust of the cutter; the cutter can enter the cutting groove; the arc surface can clamp the feed rod.

[0013] A product is blow-molded using the aforementioned blow molding device.

[0014] In summary, this utility model has the following beneficial technical effects:

[0015] This allows the mold to cool down, thus increasing the temperature difference between the mold and the heated raw material. During blow molding, the plastic adheres to the mold, allowing for rapid heat exchange between the plastic bottle and the mold, enabling the product to cool and solidify more quickly. This method shortens the cooling and curing time, thereby improving blow molding efficiency. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the device of this utility model.

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0018] Figure 3 This is a partial cross-sectional structural diagram of the present invention.

[0019] Figure 4 yes Figure 3 A magnified structural diagram of point A in the middle.

[0020] Figure 5 yes Figure 2 A magnified structural diagram at point B in the middle.

[0021] Figure 6 yes Figure 5 A magnified structural diagram at point C.

[0022] Explanation of reference numerals in the attached drawings: 1. Support frame; 11. Raw material box; 111. Feeding channel; 12. Feeding platform; 121. Extrusion plate; 122. Pressure chamber; 123. Filling chamber; 124. Extrusion spring; 125. Discharge port; 126. Feed inlet; 13. Feeding rod; 2. Worktable; 21. Lifting cylinder; 22. Left mold; 23. Right mold; 24. Opening and closing cylinder; 3. Cooling assembly; 31. Water inlet pipe; 32. Connecting groove; 33. Cooling... 34. Switch slot; 35. Switch plate; 36. Switch spring; 37. Connecting hole; 38. Linkage plate; 39. Water outlet pipe; 4. Discharge assembly; 41. Lifting rod; 42. Abutment part; 43. Rack groove; 44. Gear; 5. Blow molding assembly; 51. Blow molding pump; 52. Blow molding tube; 53. Blow molding hole; 6. Shearing assembly; 61. Slide groove; 62. Slider; 63. Arc surface; 64. Cutting groove; 65. Cutting knife; 66. Cutting spring. Detailed Implementation

[0023] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive. Furthermore, the terms "first," "second," "third," and similar expressions are used for descriptive and distinguishing purposes only and should not be construed as indicating or implying the relative importance of the corresponding components.

[0024] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 This application will be described in further detail.

[0025] This application discloses a blow molding apparatus.

[0026] A blow molding apparatus includes a support frame 1, a raw material bin 11, a feeding platform 12, and a worktable 2. The raw material bin 11 is mounted on the support frame 1, the feeding platform 12 is located below the support frame, and the worktable 2 is located directly below the feeding platform 12. The worktable 2 is also equipped with a lifting cylinder 21, which can drive the worktable 2 to move up and down, thereby moving it closer to or away from the feeding platform 12. A left mold 22 and a right mold 23 are slidably mounted on the bottom of the worktable 2, along with an opening and closing cylinder 24 for driving the opening and closing of the left mold 22 and the right mold 23.

[0027] The raw material bin 11 contains raw material, which is plastic granules. The raw material bin 11 has a feeding channel 111, which can be heated. The heated and molten plastic is then conveyed to the feeding table 12 by the spiral feeding rod 13. The feeding table 12 is equipped with the feeding rod 13. The feeding rod 13 and the feeding table 12 can turn the molten raw material into a fluid ring shape and enter the worktable 2. The worktable 2 is equipped with a left mold 22 and a right mold 23. The ring-shaped plastic enters between the two molds. Then, the opening and closing cylinder 24 drives the left mold 22 and the right mold 23 to move closer to each other. The blow molding assembly 5 on the feeding table 12 can perform blow molding. Then, the shearing assembly 6 on the worktable 2 can cut the plastic to make plastic bottle products.

[0028] Cooling components 3 are provided on the left mold 22 and the right mold 23. After the mold is opened, the cooling components 3 can cool the left mold 22 and the right mold 23, thereby increasing the temperature difference between the left mold 22, the right mold 23 and the heated plastic, thus improving the cooling speed of the plastic.

[0029] The feeding platform 12 is fixedly connected to the support frame 1 by a support rod. A cavity is formed inside the feeding platform 12, and an extrusion plate 121 is slidably disposed within the cavity. The extrusion plate 121 divides the cavity into a pressure chamber 122 and a filling chamber 123. A compression spring 124 is installed in the pressure chamber 122 to push the extrusion plate 121 downwards. The feeding channel 111 communicates with the filling chamber 123. An outlet 125 is formed at the bottom of the filling chamber 123. The worktable 2 has an inlet 126 located directly below the outlet 125. The feeding rod 13 is located at the inlet 126 and blocks the outlet 125.

[0030] The workbench 2 is equipped with a discharge assembly 4 that can push the feed rod 13 and open the feed port 126. The discharge assembly 4 includes a lifting rod 41 and an abutment portion 42 located directly below the feed rod 13. The lifting rod 41 is slidably connected to the workbench 2 and has a rack groove 43. The workbench 2 is fixed with a motor, and the output end of the motor is provided with a gear 44 that meshes with the rack groove 43. The motor drives the gear 44 to rotate, thereby allowing the lifting rod 41 to rise or fall. When the lifting rod 41 rises, the abutment portion 42 can push the feed rod 13.

[0031] The raw material is fed into the filling cavity 123 by the screw feeder 13. As feeding continues, more and more raw material is added to the filling cavity 123. At this time, since the feeder 13 blocks the discharge port 125, the discharge port 125 is closed. Therefore, the raw material in the filling cavity 123 will push the extrusion plate 121 upward, keeping the extrusion spring 124 in a tight state, thereby increasing the pressure in the filling cavity 123. When there is a certain pressure in the filling cavity 123, if the discharge port 125 is opened, the raw material will be quickly squeezed out of the discharge port 125 through the extrusion plate 121 and the extrusion spring 124, thereby improving the efficiency of the raw material being discharged from the discharge port 125.

[0032] When the raw material in the filling cavity 123 needs to come out of the outlet 125, the upgrading cylinder first drives the worktable 2 to move upward so that the lower half of the feeding rod 13 is between the left mold 22 and the right mold 23. Then the lifting rod 41 moves upward so that the abutment part 42 pushes the feeding rod 13 upward. At this time, the outlet 125 is opened, and due to the presence of the feeding rod 13, the plastic coming out of the outlet 125 will be in a cylindrical shape. The feeding rod 13 is inside the annular raw material. The blow molding assembly 5 can blow mold the plastic through the feeding rod 13. The annular plastic is easier to adhere to the plastic bottle cavity when it is blow molded, thus forming a high-quality plastic bottle.

[0033] The blow molding assembly 5 includes a blow molding pump 51 and a blow molding tube 52 connected to the blow molding pump 51. The blow molding tube 52 is connected to a feed rod 13, and the feed rod 13 has a blow molding hole 53 communicating with the blow molding tube 52. The blow molding pump 51 delivers gas through the blow molding tube 52 into the feed rod 13, and then exits from the blow molding hole 53. The blow molding hole 53 blow molds the annular cylindrical plastic.

[0034] After exiting from the discharge port 125, the annular plastic enters the feed port 126 of the worktable 2, located between the left mold 22 and the right mold 23. The left mold 22 and the right mold 23 are joined together. The worktable 2 is equipped with a shearing assembly 6. The shearing assembly 6 first clamps the plastic onto the feed rod 13, sealing the upper part of the annular plastic. At this time, air is blown through the blow molding hole 53 of the feed rod 13, inflating the annular plastic and causing it to adhere to the cavity walls of the left mold 22 and the right mold 23. Then, the shearing assembly 6 performs shearing. Finally, the left and right molds 23 separate to allow the material to be discharged.

[0035] The shearing assembly 6 includes a slide 61 formed on the worktable 2 and sliders 62 symmetrically arranged on the slide 61. The sliders 62 can move on the slide 61 by electric drive or by rotating a lead screw. The driving method is existing technology and will not be described in detail. The slide 61 is connected to the feed port 126. The slider 62 is provided with an arc surface 63. As the slider 62 moves, the arc surface 63 can clamp the cylindrical plastic onto the feed rod 13.

[0036] The slider 62 is provided with a cutting groove 64, and a cutter 65 is slidably provided in the cutting groove 64. A cutting spring 66 is also provided in the cutting groove 64, and the cutting spring 66 can push the cutter 65 to move in the cutting direction.

[0037] The cutter cuts off the top of the annular plastic tube, and the curved surface 63 continues to clamp the plastic, ensuring the overall sealing performance of the plastic bottle cavity and facilitating blow molding. This process produces the plastic bottle.

[0038] Under the action of the cutting spring 66, the cutter 65 remains in a pushing state. At this time, the worktable 2 moves downward, which separates the plastic ring from the plastic on the feeding table 12. As the worktable 2 descends, the feeding rod 13 can also move slightly downward. The feeding rod 13 can block the discharge port 125, preventing the residual plastic in the filling cavity 123 from coming out of the discharge port 125. This makes the plastic bottle process orderly, ensuring the cutting effect and making it easier to demold the plastic bottle.

[0039] The workbench 2 is also equipped with a cooling component 3. After the left mold 22 and the right mold 23 are opened, the cooling component 3 will cool down the left mold 22 and the right mold 23.

[0040] The cooling assembly 3 has multiple components, allowing independent operation for the left mold 22 and the right mold 23. The cooling assembly 3 includes a water inlet pipe 31 located on the worktable 2, a connecting groove 32 formed on the worktable 2, and cooling pipes 33 formed on the left mold 22 and the right mold 23. The water inlet pipe 31 is connected to the connecting groove 32, and a water flow switch is installed between the cooling pipe 33 and the connecting groove 32. Cooling water enters the cooling pipe 33 through the water inlet pipe 31 and the connecting groove 32 to cool the molds. When the molds are closed, the water flow switch is closed, blocking the connecting groove 32 and preventing cooling water from entering the cooling pipe 33. When the molds are opened, the molds trigger the water flow switch, opening it and allowing the connecting groove 32 to be unblocked, thus enabling cooling.

[0041] The water flow switch includes a switch slot 34 opened in the workbench 2, a switch plate 35 slidably disposed in the switch slot 34, and a switch spring 36 disposed in the switch slot 34; the switch slot 34 is connected to the connecting slot 32, and the switch plate 35 is provided with a connecting hole 37; a linkage plate 38 is also fixed at one end of the switch plate 35, and the linkage plate 38 is located on the moving path of the left mold 22 and the right mold 23.

[0042] After the left mold 22 and right mold 23 open, they push the linkage plate 38, allowing the switch plate 35 to move within the switch slot 34. This ensures that the connecting hole 37 on the switch plate 35 is positioned within the connecting slot 32, preventing the connecting slot 32 from being blocked by the switch plate 35. When the left mold 22 and right mold 23 close, the switch spring 36 pulls the switch plate 35, moving the connecting hole 37 into the switch slot 34, blocking the connecting slot 32. This allows the cooling component 3 to operate or not operate.

[0043] The end of the cooling pipe 33 furthest from the water inlet pipe 31 is connected to the water outlet pipe 39. The water inlet pipe 31 is connected to a water source, and the water outlet pipe 39 is also connected to a water source. The water source can be a pool or tank. Water is pumped to the cooling assembly 3, which cools the left mold 22 and the right mold 23. The cooled water then flows back into the pool or tank for circulation. After the cooling water cools the left mold 22 and the right mold 23, the mold temperature decreases, increasing the temperature difference between the mold and the heated plastic. During blow molding, the plastic adheres to the mold, allowing for rapid heat exchange, which enables the plastic bottle to cool and solidify more quickly, ultimately increasing the production speed of the plastic bottle.

[0044] The implementation principle of this embodiment is as follows: After the raw material is heated and softened through the feeding channel 111, it is transported to the filling cavity 123. As the raw material increases, the extrusion plate 121 moves upward, the lifting cylinder 21 pushes the worktable 2 upward, and the discharge assembly 4 pushes the feeding rod 13 to allow the raw material to come out from the discharge port 125. After the raw material becomes a cylindrical plastic ring and is located between the left mold 22 and the right mold 23, the mold closes, the slider 62 starts to move, the cutter 65 cuts the plastic, and the cut surface clamps the upper end of the cylindrical plastic ring. During the mold closing process, the worktable 2 moves slightly downward, and the cylindrical plastic ring separates from the raw material in the feeding table 12. The blow molding assembly 5 starts to work. Through blow molding, the plastic is made to stick to the cavity wall of the mold. After molding, the mold opens to both sides, and then the cooling assembly 3 opens to cool the opened mold.

[0045] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementation methods without changing the essential spirit of this utility model. Therefore, the above specific embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as a limitation or restriction on the technical solution of this utility model. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A blow molding apparatus, characterized in that: Includes a support frame (1), a raw material box (11) mounted on the support frame (1), and a feeding platform (12) connected to the raw material box (11). The feeding platform (12) has a worktable (2) at its bottom and a lifting cylinder (21) for driving the worktable (2) to move up and down. The feeding platform (12) is equipped with a feeding rod (13). A left mold (22), a right mold (23), and a mechanism for driving the left mold (22) and right mold (23) to open are slidably mounted at the bottom of the worktable (2). The opening and closing cylinder (24) is closed. Cooling components (3) are provided on the left mold (22) and the right mold (23). The cooling components (3) include a water inlet pipe (31) provided on the workbench (2), a connecting groove (32) opened on the workbench (2), and a cooling pipe (33) opened on the left mold (22) and the right mold (23). The water inlet pipe (31) is connected to the connecting groove (32), and a water flow switch is provided between the cooling pipe (33) and the connecting groove (32).

2. The blow molding apparatus as described in claim 1, characterized in that: The water flow switch includes a switch slot (34), a switch plate (35) slidably disposed in the switch slot (34), and a switch spring (36) disposed in the switch slot (34); the switch plate (35) has a connecting hole (37); the connecting hole (37) is located between the connecting slot (32) and the cooling pipe (33) or the switch plate (35) is located between the connecting slot (32) and the cooling pipe (33); a linkage plate (38) is also fixed at one end of the switch plate (35), and the linkage plate (38) is located on the moving path of the left mold (22) and the right mold (23).

3. The blow molding apparatus as described in claim 1, characterized in that: The cooling pipe (33) is connected to an outlet pipe (39) at the end away from the water inlet pipe (31). The water inlet pipe (31) is connected to a water source, and the water outlet pipe (39) is also connected to a water source.

4. The blow molding apparatus as described in claim 1, characterized in that: The feeding platform (12) has a cavity, and an extrusion plate (121) is slidably arranged in the cavity. The extrusion plate (121) divides the cavity into a pressure chamber (122) and a filling chamber (123). The pressure chamber (122) is provided with an extrusion spring (124) for pushing the extrusion plate (121) downward. The raw material box (11) has a feeding channel (111), which is connected to the filling chamber (123). The bottom of the filling chamber (123) has a discharge port (125). The workbench (2) has a feed port (126), which is located directly below the discharge port (125). The feeding rod (13) is located at the feed port (126) and blocks the discharge port (125). The workbench (2) is provided with a discharge assembly (4) that can push the feeding rod (13) and open the feed port (126).

5. A blow molding apparatus as described in claim 4, characterized in that: The discharge assembly (4) includes a lifting rod (41) and an abutment part (42) located on the lifting rod (41). The abutment part (42) is located directly below the feeding rod (13). The lifting rod (41) is slidably connected to the worktable (2). The lifting rod (41) is provided with a rack groove (43). The worktable (2) is fixed with a motor. The output end of the motor is provided with a gear (44) that meshes with the rack groove (43).

6. The blow molding apparatus as described in claim 5, characterized in that: The feeding platform (12) is also provided with a blow molding assembly (5), which includes a blow molding pump (51) and a blow molding tube (52) connected to the blow molding pump (51). The blow molding tube (52) is connected to the feeding rod (13), and the feeding rod (13) has a blow molding hole (53) inside that communicates with the blow molding tube (52).

7. A blow molding apparatus as described in claim 1, characterized in that: The workbench (2) is also provided with a shearing assembly (6), which includes a slide groove (61) opened on the workbench (2), a slider (62) symmetrically arranged on the slide groove (61), an arc surface (63) arranged on the slider (62), a cutting groove (64) arranged on the slider (62), a cutter (65) slidably arranged on the cutting groove (64), and a cutting spring (66) arranged on the cutting groove (64) for keeping the cutter (65) pushing; the cutter (65) can enter the cutting groove (64); the arc surface (63) can clamp the feed rod (13).

Images