Inclined multi-point injection mold for hot runner of plastic chair
By introducing hot runners and magnetron sequence valves into the plastic chair mold, the position of the weld wire is controlled, and the limit rods and sliding grooves are used to ensure the correct sliding of the core pellets, the weld wires during injection molding of plastic chairs in the prior art are solved. The obvious problem has improved the aesthetics of the product and the success rate of injection molding.
Patent Information
- Application Number
- CN202420547434.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-03-20
AI Technical Summary
During the injection molding process, existing plastic chair molds have only one gate, which makes molten plastic easily impact, forming irregular welded wires, affecting the aesthetics and sales of the product.
Design a plastic chair hot runner oblique multi-point injection mold, adopt hot runner and magnetron sequence valve to control the position of the welding wire, and ensure the correct slip of the core pulling pellet through the limiting rod and sliding groove to avoid deviation, ensure The aesthetics and injection molding of the product are successful.
Effectively control the position of the welded wire so that it is hidden at the connection between the back of the chair and the bottom of the chair surface, thereby improving the aesthetics of the product and ensuring smooth injection molding and molding of the chair legs.
Smart Images
Figure CN222223382U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of molds, in particular to a hot runner oblique multi-point injection mold for a plastic chair. Background Art
[0002] Existing plastic chairs generally include a chair back, a chair surface, chair arms, and chair legs, and most of the existing plastic chairs are formed by injection molding.
[0003] Utility model patent announcement number CN205112268U discloses a hidden glue dot plastic seat mold, which sets the feed port at the boundary between the chair back and the seat with a square groove, making the injection molded seat glue dots more concealed, thus ensuring the overall aesthetics of the plastic chair to a certain extent.
[0004] However, since the above mold has only one gate, the flow direction of the molten plastic cannot be controlled during the injection molding process of the plastic chair, so that the molten plastic is easily collided with each other during the injection molding process, thereby forming various irregular weld lines on the surface of the product, directly affecting the appearance of the product and thus affecting the sales of the product. Utility Model Content
[0005] In order to solve the problem of obvious surface weld lines during injection molding of plastic chairs, the present application provides a hot runner oblique multi-point injection mold for plastic chairs.
[0006] The hot runner oblique multi-point injection mold for a plastic chair provided in this application adopts the following technical solution:
[0007] A hot runner oblique multi-point injection mold for a plastic chair, comprising a fixed mold and a movable mold, wherein the fixed mold and the movable mold are provided with molding cavities for product injection molding, and the fixed mold is also provided with a core pulling mechanism for chair leg injection molding, characterized in that: the mold is also provided with a hot runner, and the hot runner is provided with a first hot nozzle, a second hot nozzle and a third nozzle, and the discharge ports of the first hot nozzle, the second hot nozzle and the third hot nozzle are all provided with magnetically controlled sequential valves, so that the area on the fixed mold molding cavity for molding the chair back is the first molding area, the discharge port of the first hot nozzle and the discharge port of the second hot nozzle are respectively located on the left and right sides of the middle of the first molding area, and the third hot nozzle is located at the center of the bottom end of the first molding area.
[0008] By adopting the above technical solution, hot runner injection molding is used during product injection molding to improve the fluidity of the plastic melt during injection molding, so that the plastic is easier to mix when it collides, thereby reducing the generation of weld lines. The setting of the magnetically controlled sequential valve allows the opening time of each hot nozzle to be controlled during product injection molding. First, the first hot nozzle is opened to allow the plastic to enter the molding cavity. When the plastic flows to almost approach the second hot nozzle, the second hot nozzle is opened and the first hot nozzle is closed. The plastic flows out of the second hot nozzle and fills the first molding area together with the original plastic and spreads to the seat surface. When the plastic is filled to the junction of the first molding area and the seat surface molding area, the second hot nozzle is closed and the third hot nozzle is started. The plastic flowing out of the third hot nozzle contacts the plastic in the first molding area to form a weld line. At this time, the weld line is located at the connection between the non-abutting surface of the backrest and the non-sitting surface of the backrest in the plastic chair, so that the weld line can no longer be seen on the surface of the plastic chair when viewed from the front, solving the problem of obvious surface weld lines during injection molding of plastic chairs.
[0009] Preferably, the discharge ports of the first hot nozzle, the second hot nozzle and the third hot nozzle are all in contact with the first molding area.
[0010] By adopting the above technical solution, the first hot nozzle, the second hot nozzle and the third hot nozzle are tilted so that the discharge port fits the first molding area, so that there will be no gap between the discharge port of the hot nozzle and the surface of the product molding cavity, so that no unnecessary bumps or grooves will be generated during the injection molding of the product, thereby improving the surface aesthetics of the product.
[0011] Preferably, the core-pulling mechanism comprises a core-pulling block slidably connected to the mold for forming the chair legs, and a first driving part for driving the core-pulling block to slide.
[0012] By adopting the above technical solution, the first driving part drives the core-pulling block to slide, thereby realizing the molding and demoulding of the chair legs.
[0013] Preferably, the mold is further provided with a slide table for limiting the sliding direction of the core pulling block, and the core pulling block is slidably connected in the slide table.
[0014] By adopting the above technical solution, the setting of the slide restricts the movement direction of the core pulling block, thereby preventing the core pulling block from shifting during the sliding process, making it impossible to complete the injection molding and demoulding of the product.
[0015] Preferably, a limiting rod is provided on the core pulling block, and one end of the limiting rod away from the core pulling block passes through a slide table, and a sliding groove for sliding movement of the limiting rod is provided on the slide table.
[0016] By adopting the above technical solution, the cooperation between the limit rod and the sliding groove enables the sliding position of the core pulling block to be adjusted in advance, thereby ensuring that the core pulling block can be moved to a suitable position each time so that the chair legs can be smoothly injected and demoulded.
[0017] Preferably, a limit block is provided on the mold, a slot is provided on the core pulling block, one end of the limit block is slidably connected in the slot along the depth direction of the slot, and a second driving part for driving the limit block to slide is provided on the mold, and one end of the limit block away from the limit block is connected to the second driving part.
[0018] By adopting the above technical solution, when the mold is closed for injection molding, the second driving unit drives the limit block to slide into the slot to limit the core pulling block, thereby avoiding the core pulling block from being displaced backward due to excessive injection pressure and holding pressure during the injection molding of the chair leg.
[0019] Preferably, the limit block is provided with an L-shaped shift plate, one end of the L-shaped shift plate is fixedly connected to the limit hole, the other end extends out of the mold and is fixedly connected to a protrusion, and the mold is provided with a first clamping block and a second clamping block for limiting the sliding position of the protrusion.
[0020] By adopting the above technical solution, the limitation of the sliding position of the fixed block by the first clamping block and the second clamping block is the limitation of the sliding position of the limit block, thereby avoiding the second driving unit from over-driving the limit block to move, and avoiding the limit block from pressing the core pulling block when sliding into the clamping slot, causing the core pulling block to shift, resulting in dimensional deviation during injection molding of the chair legs.
[0021] The technical effects of this utility model are mainly reflected in the following aspects:
[0022] 1. The utility model controls the weld line on the connecting surface between the back of the chair and the bottom of the seat surface by setting a hot runner and a magnetically controlled sequential valve, so that the weld line can no longer be seen on the surface of the plastic chair when viewed from the front, thereby solving the problem of obvious weld lines on the surface of the product during injection molding of plastic chairs;
[0023] 2. The utility model makes the sliding position of the core-pulling block to be adjusted in advance through the cooperation of the limit rod and the sliding groove, thereby ensuring that the core-pulling block can be moved to a suitable position each time so that the chair legs can be smoothly injected and demolded;
[0024] 3. The utility model limits the movement direction of the core pulling block by setting the slide table, so as to avoid the core pulling block from deviating during the sliding process, making it impossible to complete the injection molding and demoulding of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 Schematic diagram of the mechanism of this embodiment.
[0026] Figure 2 It is a structural schematic diagram of the fixed mold in this embodiment.
[0027] Figure 3 It is a schematic diagram of the structure of the hot runner and the first molding area in this embodiment.
[0028] Figure 4 It is a structural schematic diagram of the hot runner and the first molding area from another angle in this embodiment.
[0029] Figure 5 Schematic diagram of the structure of the core pulling mechanism in this embodiment.
[0030] Figure 6 It is a structural schematic diagram of the core pulling mechanism from another angle in this embodiment.
[0031] Figure 7 yes Figure 2 A partial enlarged view of point A in the middle.
[0032] Explanation of the reference numerals: 1. fixed mold; 11. first molding area; 2. movable mold; 3. hot runner; 31. first hot nozzle; 32. second hot nozzle; 33. third hot nozzle; 4. core pulling mechanism; 41. core pulling block; 411. limiting rod; 5. first driving unit; 6. slide; 61. sliding groove; 7. limiting block; 71. L-shaped shift block; 711. protrusion; 72. first clamping block; 73. second clamping block; 8. second driving unit. DETAILED DESCRIPTION
[0033] The present application is further described in detail below in conjunction with the accompanying drawings to make the technical solution of the present application easier to understand and grasp.
[0034] The embodiment of the present application discloses a hot runner oblique multi-point injection mold for a plastic chair.
[0035] Reference Figure 1-Figure 4 , a plastic chair hot runner 3 oblique multi-point injection mold of the present embodiment includes a fixed mold 1 and a movable mold 2, the fixed mold 1 and the movable mold 2 are provided with a molding cavity for product injection molding, and the mold is also provided with a hot runner 3, the hot runner 3 is provided with a first hot nozzle 31, a second hot nozzle 32 and a third nozzle, the discharge ports of the first hot nozzle 31, the second hot nozzle 32 and the third hot nozzle 33 are all provided with a magnetically controlled sequential valve, so that the area on the molding cavity of the fixed mold 1 for molding the chair back is the first molding area 11, the discharge port of the first hot nozzle 31 and the discharge port of the second hot nozzle 32 are respectively located on the left and right sides of the middle of the first molding area 11, and the third hot nozzle 33 is located at the center of the bottom of the first molding area 11, and the discharge ports of the first hot nozzle 31, the second hot nozzle 32 and the third hot nozzle 33 are all in contact with the first molding area 11.
[0036] Reference Figure 1-Figure 4, when the product is injected, the hot runner 3 is used for injection molding, which improves and ensures the fluidity of the plastic melt during injection molding, so that the plastic is easier to mix when it collides, thereby reducing the generation of weld lines. The setting of the magnetic control sequence valve allows the opening time of each hot nozzle to be controlled during product injection molding. First, the first hot nozzle 31 is opened to allow the plastic to enter the molding cavity. When the plastic flows to almost approach the second hot nozzle 32, the second hot nozzle 32 is opened, and the first hot nozzle 31 is closed. The plastic flows out of the second hot nozzle 32 and fills the first molding area 11 together with the original plastic and spreads to the seat surface. When the plastic is filled to the junction of the first molding area 11 and the seat surface molding area, the second hot nozzle 32 is closed and the third hot nozzle 33 is started. The plastic flowing out of the third hot nozzle 33 contacts the plastic in the first molding area 11 to form a weld line. At this time, the weld line is located at the connection between the non-abutting surface of the backrest and the non-end-sitting surface of the backrest in the plastic chair, so that the weld line can no longer be seen on the surface of the plastic chair when viewed from the front, solving the problem of obvious surface weld lines during injection molding of plastic chairs. The first hot nozzle 31, the second hot nozzle 32 and the third hot nozzle 33 are tilted so that the discharge ports fit the first molding area 11, so that there will be no gap between the discharge ports of the hot nozzles and the surface of the product molding cavity, so that no extra bumps 711 or grooves are generated during product injection molding, thereby improving the surface aesthetics of the product.
[0037] Reference Figure 2 , Figure 2-Figure 7 The mold of this embodiment is provided with four core pulling mechanisms 4 for chair leg injection molding, and the core pulling mechanisms 4 include a core pulling block 41 slidably connected to the mold for molding chair legs, and a first driving part 5 for driving the core pulling block 41 to slide. A slot is provided on the core pulling block 41, and a limit block 7 is also provided on the mold to prevent the core pulling block 41 from being displaced during plastic injection molding. One end of the limit block 7 is slidably connected in the slot along the depth direction of the slot. A second driving part 8 is also provided on the mold for driving the limit block 7 to slide, and one end of the limit block 7 away from the limit block 7 is connected to the second driving part 8. During the injection molding of the chair legs, the first driving unit 5 drives the core pulling block 41 to slide into the mold, and then the second driving unit 8 drives the limiting block 7 to slide into the slot to limit the core pulling block 41, so as to avoid the core pulling block 41 from being displaced backward due to excessive injection pressure and holding pressure during the injection molding of the chair legs. After the molding of the chair legs is completed, the second driving unit 8 first drives the limiting block 7 to slide into the slot, and then the first driving unit 5 drives the core pulling block 41 to slide out of the mold to complete the injection molding of the chair legs.
[0038] Reference Figure 2 , Figure 5-Figure 7The limit block 7 is provided with an L-shaped shifting block 71, one end of the L-shaped shifting plate is fixedly connected to the limit hole, and the other end extends out of the mold and is fixedly connected to the protrusion 711. The mold is provided with a first clamping block 72 and a second clamping block 73 for limiting the sliding position of the protrusion 711. The first clamping block 72 and the second clamping block 73 limit the sliding position of the protrusion 711, thereby controlling the sliding position of the limit block 7, avoiding the second driving unit 8 from over-driving the limit block 7 to move so that the limit block 7 will not press the core pulling block 41 when it slides into the card slot, thereby avoiding the limit block 7 from pressing the core pulling block 41 to cause the core pulling block 41 to deviate, resulting in a size deviation during the injection molding of the chair leg.
[0039] Reference Figure 2 , Figure 5-Figure 7 The mold of this embodiment is also provided with a slide 6 for limiting the sliding direction of the core pulling block 41, and the core pulling block 41 is slidably connected in the slide 6. A limit rod 411 is provided on the core pulling block 41, and the end of the limit rod 411 away from the core pulling block 41 passes through the slide 6, and a sliding groove 61 is provided on the slide 6 for the limit rod 411 to slide. The setting of the platform limits the movement direction of the core pulling block 41, avoiding the displacement of the core pulling block 41 during the sliding process, so that the injection and demolding of the product cannot be completed. The cooperation between the limit rod 411 and the sliding groove 61 allows the displacement distance of the core pulling block 41 to be adjusted in advance, thereby ensuring that the core pulling block 41 can be displaced to a suitable position each time so that the chair legs can be smoothly injected and demolded.
[0040] The driving part in this embodiment may be an oil cylinder or a gas cylinder.
[0041] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.
Claims
1. A hot runner oblique multi-point injection mold for a plastic chair, comprising a fixed mold (1) and a movable mold (2), wherein the fixed mold (1) and the movable mold (2) are provided with a molding cavity for product injection molding, and the fixed mold (1) is also provided with a core pulling mechanism (4) for chair leg injection molding, characterized in that: The mold is also provided with a hot runner (3), and the hot runner (3) is provided with a first hot nozzle (31), a second hot nozzle (32) and a third nozzle. The discharge ports of the first hot nozzle (31), the second hot nozzle (32) and the third hot nozzle (33) are all provided with magnetically controlled sequential valves, so that the area on the molding cavity of the fixed mold (1) for molding the chair back is the first molding area (11), and the discharge port of the first hot nozzle (31) and the discharge port of the second hot nozzle (32) are respectively located on the left and right sides of the middle of the first molding area (11), and the third hot nozzle (33) is located at the center of the bottom end of the first molding area (11).
2. The hot runner oblique multi-point injection mold for plastic chairs according to claim 1, characterized in that: The discharge ports of the first hot nozzle (31), the second hot nozzle (32) and the third hot nozzle (33) are all in contact with the first molding area (11).
3. The hot runner oblique multi-point injection mold for plastic chairs according to claim 1, characterized in that: The core-pulling mechanism (4) comprises a core-pulling block (41) slidably connected to the mold for forming the chair legs, and a first driving part (5) for driving the core-pulling block (41) to slide.
4. The hot runner oblique multi-point injection mold for plastic chairs according to claim 3, characterized in that: The mold is also provided with a slide table (6) for limiting the sliding direction of the core pulling block (41), and the core pulling block (41) is slidably connected in the slide table (6).
5. The hot runner oblique multi-point injection mold for plastic chairs according to claim 4, characterized in that: The core pulling block (41) is provided with a limiting rod (411), one end of the limiting rod (411) away from the core pulling block (41) passes through a slide table (6), and the slide table (6) is provided with a sliding groove (61) for the limiting rod (411) to slide.
6. The hot runner oblique multi-point injection mold for plastic chairs according to claim 3, characterized in that: The mold is also provided with a limit block (7) for preventing the core-pulling block (41) from shifting during plastic injection molding, and a second driving part (8) for driving the limit block (7) to slide.
7. The hot runner oblique multi-point injection mold for plastic chairs according to claim 6, characterized in that: The limit block (7) is provided with an L-shaped shift block (71), one end of the L-shaped shift block is fixedly connected to the limit block (7), and the other end extends out of the mold and is fixedly connected to the protrusion (711), and the mold is provided with a first clamping block (72) and a second clamping block (73) for limiting the sliding position of the protrusion (711).