Television base and sandwich injection mold

Abstract

According to the television base and the sandwich injection mold, the television base is of a sandwich injection molding structure, a core layer is wrapped by a surface layer, the core layer of a television connecting part is aligned with the surface layer of the television connecting part, and the length of the core layer of a first supporting leg is larger than that of the core layer of a second supporting leg. The sandwich injection mold comprises a fixed mold and a movable mold, the movable mold is provided with a material flow adjusting mechanism, the material flow adjusting mechanism comprises a material flow adjusting part, the material flow adjusting part is provided with a first slope face facing the forming area corresponding to the first supporting leg and a second slope face facing the forming area corresponding to the second supporting leg, and the gradient of the first slope face is smaller than that of the second slope face. According to the television base, the supporting stability, the high supporting strength and the good appearance can be considered; the television base can be subjected to sandwich injection molding through the sandwich injection mold, filling materials of the two supporting legs are balanced, and the supporting reliability of the television base is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of molds, and in particular relates to a sandwich injection mold for a TV base used for sandwich injection molding of the TV base. Background Art

[0002] Sandwich injection molding, also known as co-injection molding or sandwich injection molding, is a molding process in which the surface material and the core material are continuously injected into the mold cavity to obtain a plastic product with a sandwich-like structure in which the core material is embedded between the surface material layers.

[0003] Sandwich injection molding uses two materials for three injections. First, material A (surface material) is injected. When the volume of material A reaches the process requirements, material B (core material) is injected from the same gate. At this time, material B will push material A, which is still in a molten state, to continue to move forward to fill the cavity. Since material A close to the mold cavity wall has cooled and formed a solidified layer, material B only penetrates forward inside material A. When the injected material B meets the process requirements, a certain volume of material A is injected again, and material A completes the sealing and pressure holding of the injection molded product. After the injection is completed, a sandwich injection molded product is obtained in which the outer surface material completely wraps the inner core material.

[0004] Sandwich injection molding products, due to their special sandwich structure, can also choose the inner and outer layer materials according to different needs, "combining" the excellent properties of different plastics together to obtain special products that cannot be obtained by general plastic processing. The usual combination of inner and outer layer materials is as follows: (1) The outer layer is made of reinforced material and the inner layer is non-reinforced plastic. It is mainly used for products that withstand bending stress and load on the surface, which can greatly reduce costs; (2) The inner layer is reinforced plastic and the outer layer is high-finish material to achieve the unity of beautiful appearance and high strength of the product; (3) The inner layer is made of high-strength material and the outer layer is made of wear-resistant material. It is used to make the molded surface wear-resistant, has a low friction coefficient, and has a relatively high strength as a whole, such as bushings, gears and other parts; (4) Products with an inner layer made of conductive or magnetic material and an outer layer made of insulating material; or, products with an inner layer made of conductive or magnetic material and having conductive or magnetic properties to provide electromagnetic shielding, while an outer layer made of ordinary plastic has an insulating effect to prevent short circuits in electrical component housings. Such products are widely used in electrical instruments, office equipment, computer housings, etc.

[0005] In the prior art, TV bases are usually made of ordinary injection molding. In terms of material selection, on the one hand, since the TV base has to bear the weight of the TV, it requires high-strength support materials, usually nylon or fiberglass; on the other hand, since the base is also an appearance product, it is necessary to ensure a good appearance after molding, and the appearance of nylon or fiberglass materials has more or less defects, making it difficult for ordinary injection-molded TV bases to meet the expected requirements.

[0006] When sandwich injection molding the TV base using the above-mentioned combination form (2), since there are many types of surface materials to choose from, such as appearance-grade PP materials, metal powder spray-free materials, etc., it can take into account both high supporting strength and good appearance of the TV base.

[0007] However, for some TV bases, the two legs are of different lengths (need to achieve a negative inclination angle to ensure the stability of the TV). Such products will result in an imbalance in the core material of the two supporting legs during sandwich injection molding. Figure 1 As shown in the figure, the rubber material is injected downward from the middle gate of the base, half of the material flows to the left leg 1, and the other half flows to the right leg 2. Since the left leg is long and the right leg is short, the left leg requires more rubber material and the right leg requires less rubber material. When injecting the surface material 4, the short leg is filled first and the long leg is not filled, resulting in a cavity at the end. Then, when injecting the core material 3, the short leg is filled first, and the core material in the long leg pushes the surface material to fill the cavity. However, due to the large length of the long leg, the core material cannot reach the end, resulting in a cavity. Figure 1 The length of the inner core layer of the long leg is nearly equal to that of the inner core layer of the short leg, which results in more surface material at the end of the long leg, making the ratio of the core material to the surface material of the two legs different, that is, the filling material of the two legs is unbalanced.

[0008] Since the core layer material of the sandwich injection molded TV base uses high-strength material, which mainly plays a supporting role, if the filling materials of the two legs are unbalanced, the base will be poorly supported and the TV will fall over.

[0009] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0010] In view of the problems pointed out in the background technology, the present invention proposes a TV stand that can take into account supporting stability, high supporting strength and good appearance.

[0011] The present invention also proposes a sandwich injection mold, which is used for sandwich injection molding of a TV base with two legs of unequal lengths, and balances the filling materials of the two legs, thereby effectively improving the support reliability of the TV base.

[0012] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: In some embodiments of the present application, a television base is provided, comprising: A first leg, a second leg and a TV connection portion; The TV connection portion is located between the first leg and the second leg, and is respectively connected to the top of the first leg and the top of the second leg; An obtuse angle is formed between the first leg and the second leg, and the length of the first leg is greater than the length of the second leg; The TV base is a sandwich injection molding structure, including a core layer and a surface layer, wherein the surface layer wraps the core layer, the core layer of the TV connection part is aligned with the surface layer of the TV connection part, and the core layer length of the first leg is greater than the core layer length of the second leg.

[0013] In some embodiments of the present application, foot pad positioning grooves are respectively formed on the surface bottom end supporting surfaces of the first leg and the surface bottom end supporting surfaces of the second leg, and foot pads are installed in the foot pad positioning grooves, and the foot pads protrude downward from the foot pad positioning grooves.

[0014] In some embodiments of the present application, a sandwich injection mold is provided, which is used for sandwich injection molding the above-mentioned TV base, comprising: A fixed mold, wherein the fixed mold includes a cavity; A movable mold, the movable mold comprising a core, the core and the cavity enclosing a base molding space; The fixed mold is provided with a gate for sequentially injecting the surface material, the core material and the surface material into the base molding space, the gate is connected with the base molding space and is aligned with the molding area corresponding to the TV connection part; The movable mold is provided with a material flow adjustment mechanism, which includes a material flow adjustment part. The material flow adjustment part is located in the molding area corresponding to the TV connection part and is arranged opposite to the gate; the material flow adjustment part has a first slope surface facing the molding area corresponding to the first leg, and a second slope surface facing the molding area corresponding to the second leg, and the slope of the first slope surface is smaller than the slope of the second slope surface.

[0015] In some embodiments of the present application, the material flow adjustment portion is conical, with its small end pointing to the gate and its large end away from the gate; the material flow adjustment portion has a circular cross-section, and a line between its small end and the center of the circular cross-section intersects with the circular cross-section but is not perpendicular to it.

[0016] In some embodiments of the present application, the material flow adjustment portion is fixedly connected to an extension portion, and the extension portion is located outside the base molding space; the cross-section of the extension portion is circular, one end of which is fixedly connected to the large end of the material flow adjustment portion, and the other end is a free end, and the extension portion is coaxial with the large end of the material flow adjustment portion; the extension portion can rotate to drive the material flow adjustment portion to rotate.

[0017] In some embodiments of the present application, the material flow adjustment mechanism also includes a rotation driving component for driving the extension portion to rotate.

[0018] In some embodiments of the present application, the free end of the extension portion has a gear portion, and one end of the rotation drive component has a screw portion, and the screw portion cooperates with the gear portion to drive the extension portion to rotate by rotating the rotation drive component.

[0019] In some embodiments of the present application, the material flow adjustment mechanism further includes a height adjustment component for driving the extension portion to move along its axial direction to change the distance between the material flow adjustment portion and the gate.

[0020] In some embodiments of the present application, the fixed mold further includes a detection portion cavity; The movable mold further includes a detection part core, and the detection part core and the detection part cavity enclose a detection part molding space for molding the base detection part; There are two molding spaces for the detection part, which are respectively located at the outer side of the bottom end of the molding area corresponding to the first leg and the outer side of the bottom end of the molding area corresponding to the second leg, and are respectively connected to the molding area corresponding to the first leg and the molding area corresponding to the second leg; During the inspection, the base inspection part is cut off to check whether the cross section contains core layer material.

[0021] In some embodiments of the present application, the molding space of the detection portion has a hook portion, and the hook portion penetrates into the bottom of the molding area of ​​the foot pad positioning groove through the movable mold.

[0022] Compared with the prior art, the advantages and positive effects of the present invention are: 1. The TV base of the present invention is made of sandwich injection molding, the inner core layer can be made of reinforced plastic to ensure the high support strength of the TV base, and the outer surface layer can be made of high-finish material to improve the appearance of the base, so that the TV base of the present invention can ensure high support strength and have a good appearance; 2. The two legs of the TV base of the present invention are of different lengths, that is, the length of the first leg (front leg) is greater than the length of the second leg (rear leg), so that the TV base can form a negative inclination angle when supporting the TV, thereby ensuring the stability of the TV; correspondingly, the core layer length of the first leg is also greater than the core layer length of the second leg, the bottom end of the core layer of the first leg can extend to the bottom support surface of the first leg, and the bottom end of the core layer of the second leg can extend to the bottom support surface of the second leg, which is conducive to ensuring that the ratio of the core layer material to the surface layer material of the two legs is the same, thereby balancing the filling materials of the two legs and ensuring the support reliability of the TV base; 3. The sandwich injection mold of the present invention is used for sandwich injection molding of the TV base of the present invention, so that the filling materials of the two legs are balanced, and the supporting reliability of the TV base is effectively improved.

[0023] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a schematic diagram of the cross-sectional structure of a TV base formed by a sandwich injection mold of the prior art; Figure 2 It is a schematic diagram of the cross-sectional structure of the television base of the present invention formed by the sandwich injection mold of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the sandwich injection mold of the present invention; Figure 4 for Figure 3 A-direction view; Figure 5 for Figure 4 CC section view; Figure 6 for Figure 5 A magnified view of the D portion; Figure 7 for Figure 5 A magnified view of part E; Figure 8 for Figure 3 B-direction view; Fig. 9 for Figure 8 FF cross-sectional view; Fig.10 It is a schematic diagram of the three-dimensional structure of the movable mold of the sandwich injection mold of the present invention; Fig.11 It is a schematic diagram of the three-dimensional structure of the fixed mold of the sandwich injection mold of the present invention; Fig.12 It is a schematic diagram of the overall structure of the material flow adjustment part and the extension part of the material flow adjustment mechanism of the sandwich injection mold of the present invention; Fig.13 for Fig.12 Enlarged view of the G section; Fig.14 It is a structural schematic diagram of a material flow adjustment mechanism of a sandwich injection mold of the present invention from one perspective; Fig.15 It is a structural schematic diagram of the material flow adjustment mechanism of the sandwich injection mold of the present invention from another perspective; Fig.16 It is a structural schematic diagram of the detection part core of the sandwich injection mold of the present invention; Fig.17 for Fig.16 A top view of Fig.18 for Fig.17 HH cross-sectional view.

[0026] Figure 1 Reference numerals: 1. Left leg; 2. Right leg; 3. Core material; 4. Surface material; Figures 2 to 16 Reference numerals: 100, TV base; 110, first leg; 111, core layer of first leg; 112, surface layer of first leg; 120, second leg; 121, core layer of second leg; 122, surface layer of second leg; 130, TV connection part; 131, core layer of TV connection part; 132, surface layer of TV connection part; 140, foot pad positioning groove; 200, sandwich injection mold; 210, fixed mold; 211, cavity; 212, gate; 213, detection part cavity; 220, movable mold; 221, core; 222, air avoidance groove; 223, detection part core; 224, detection part core insert; 230, base molding space; 240, material flow adjustment mechanism; 241, material flow adjustment part; 241A, first slope; 241B, second slope; 242, extension part; 242A, gear part; 242B, annular boss; 243, rotation driving part; 243A, screw part; 244, height adjustment part; 244A, cam structure; 245, elastic part; 250, detection part molding space; 251, hook part; 260, adjustment block. Implementation

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0033] Figure 2 A TV base 100 in some embodiments of the present application is exemplarily shown, which is used to support a TV and includes a first leg 110 , a second leg 120 and a TV connection portion 130 .

[0034] The TV connection part 130 is a part directly connected to the TV, and is provided with a connection structure matched with the bottom of the TV. The specific structure of the TV connection part 130 is the same as the prior art, and is not described here. The TV connection part 130 is located between the first leg 110 and the second leg 120, and is connected to the top of the first leg 110 and the top of the second leg 120 respectively.

[0035] The first leg 110 and the second leg 120 are both obliquely placed long strips, forming an obtuse angle between them, and the length of the first leg 110 is greater than the length of the second leg 120. When the TV base 100 is placed on a horizontal support surface, the first leg 110, the TV connection portion 130, the second leg 120, and the horizontal support surface form an obtuse triangle with the TV connection portion 130 as the vertex and the first leg 110 and the second leg 120 as two hypotenuses.

[0036] The TV base 100 is a sandwich injection molding structure, including a core layer and a surface layer, the surface layer wraps the core layer, the surface layer 132 of the TV connection part is aligned with the surface layer 131 of the TV connection part, the length of the core layer 111 of the first leg is greater than the length of the core layer 121 of the second leg; since the length of the first leg 110 is greater than the length of the second leg 120, the length of the surface layer 112 of the first leg is also greater than the length of the surface layer 122 of the second leg.

[0037] The TV base 100 in some embodiments of the present application is formed by sandwich injection molding. The internal core layer can be made of reinforced plastic to ensure the high supporting strength of the TV base 100, and the external surface layer can be made of high-gloss material to improve the appearance of the base, so that the TV base 100 can ensure high supporting strength and have a good appearance. At the same time, the two legs of the TV base 100 are of different lengths, that is, the length of the first leg 110 (the front leg when supporting the TV) is greater than the length of the second leg 120 (the rear leg when supporting the TV), so that the TV base 100 can form a negative inclination angle when supporting the TV, thereby ensuring the stability of the TV; correspondingly, the length of the core layer 111 of the first leg is also greater than the length of the core layer 121 of the second leg, the bottom end of the core layer 111 of the first leg extends to the bottom support surface a of the first leg 110, and the bottom end of the core layer 121 of the second leg extends to the bottom support surface b of the second leg 120, which is conducive to ensuring that the ratio of the core layer material to the surface layer material of the two legs is the same, thereby balancing the filling materials of the two legs and ensuring the support reliability of the TV base 100.

[0038] In some embodiments of the present application, a foot pad positioning groove 140 is formed on the bottom support surface a of the surface layer 112 of the first leg and on the bottom support surface b of the surface layer 122 of the second leg, and a foot pad is installed in the foot pad positioning groove 140, and the foot pad protrudes downward from the foot pad positioning groove 140. The foot pad can improve the anti-slip ability and support reliability of the TV base 100, and the foot pad can be fixed in the foot pad positioning groove 140 by gluing or injection molding.

[0039] Figures 2 to 18 The sandwich injection mold 200 in some embodiments of the present application is exemplarily shown, which is used for sandwich injection molding the above-mentioned TV base 100. The sandwich injection mold 200 includes a fixed mold 210 and a movable mold 220, the fixed mold 210 includes a cavity 211, and the movable mold 220 includes a core 221, and the core 221 and the cavity 211 enclose a base molding space 230.

[0040] The fixed mold 210 is provided with a gate 212, which is used to sequentially inject the surface material, the core material and the surface material into the base molding space 230. The gate 212 is connected to the base molding space 230 and is aligned with the molding area corresponding to the TV connection part 130. Sandwich injection molding uses two materials, the surface material and the core material, for three injections. The surface material is injected first; when the volume of the surface material reaches the process requirements, the core material is injected through the same gate 212. At this time, the core material will push the surface material that is still in a molten state to continue to move forward to fill the molding space. Since the surface material close to the mold cavity wall has cooled and formed a solidified layer at this time, the core material only penetrates forward inside the surface material; when the injected core material meets the process requirements, a certain volume of surface material is injected again, and the surface material completes the sealing and pressure holding of the injection molded product. After the injection is completed, the TV base 100 with the outer surface material completely wrapping the inner core material is obtained.

[0041] like Figure 5 , Figure 6 , Fig. 9 , Figures 12 to 15 As shown, a material flow adjustment mechanism 240 is provided on the movable mold 220, and the material flow adjustment mechanism 240 includes a material flow adjustment portion 241. The material flow adjustment portion 241 is located in the molding area corresponding to the TV connection portion 130, and is arranged opposite to the gate 212, specifically located on the bottom surface of the molding area corresponding to the TV connection portion; the material flow adjustment portion 241 has a first slope 241A facing the molding area corresponding to the first leg 110, and a second slope 241B facing the molding area corresponding to the second leg 120, and the slope of the first slope 241A is smaller than the slope of the second slope 241B.

[0042] by Figure 5 Taking the perspective shown as an example, the rubber material is injected downward from the gate 212 on the fixed mold 210. Since a material flow adjustment part 241 is provided on the opposite side of the gate 212, the gate 212 is opposite to the material flow adjustment part 241, and the material flow impacts the material flow adjustment part 241, and the material flow adjustment part 241 disperses the material flow. Since the slope of the first slope 241A of the material flow adjustment portion 241 toward the molding area corresponding to the first leg 110 is smaller than the slope of the second slope 241B toward the molding area corresponding to the second leg 120, that is, the first slope 241A is relatively gentle compared to the second slope 241B, the amount of material injected from the gate 212 flowing to the molding area corresponding to the first leg 110 after being dispersed by the material flow adjustment portion 241 will be greater than the amount of material flowing to the molding area corresponding to the second leg 120, and the more the amount of material, the faster the filling, which is conducive to enabling the filling material in the first leg 110 with a longer length to smoothly reach the end (bottom end) of the corresponding molding area, and accordingly, the core layer material in the first leg 110 can also reach the bottom support surface of the first leg 110, such as Figure 5As shown, the filling materials of the first leg 110 and the second leg 120 are balanced, ensuring the support reliability of the TV base 100. Unlike the prior art, the core layer materials in the two legs are the same, resulting in insufficient core layer material at the end of the long leg, making the filling materials of the two legs unbalanced and causing poor support.

[0043] The material flow adjustment portion 241 is part of the movable mold 220 . When the sandwich injection molding is completed and the product is ejected, it remains on the movable mold 220 . Accordingly, a concave structure is formed on the bottom surface of the surface layer 131 of the TV connection portion of the TV base 100 .

[0044] In some embodiments of the present application, Fig.12 and Fig.13 As shown, combined with Figure 5 , Figure 6 and Fig. 9 The material flow adjustment part 241 is conical, with its small end pointing to the side where the gate 212 is located, and its large end away from the gate 212; the material flow adjustment part 241 has a circular cross section, and the line l between its small end (specifically the center of the small end face) and the center of the circular cross section intersects with the plane where the circular cross section is located but is not perpendicular, that is, the line l and the axis L of the circular cross section of the material flow adjustment part 241 do not coincide, and an angle α is formed between the two, that is, along the axial direction of the material flow adjustment part 241, the centers of each circular cross section are not coaxial, and the material flow adjustment part 241 is an eccentric cone. In this way, the circumferential side surface of the material flow adjustment part 241 has different slopes at various locations along the circumference, which is convenient for flexible adjustment.

[0045] In some embodiments of the present application, the material flow adjustment part 241 is fixedly connected to the extension part 242, and the extension part 242 is located outside the base molding space 230; the cross section of the extension part 242 is circular, one end of which is fixedly connected to the large end of the material flow adjustment part 241, and the other end is a free end, and the extension part 242 is coaxial with the large end of the material flow adjustment part 241; the extension part 242 can rotate to drive the material flow adjustment part 241 to rotate. Therefore, by rotating the extension part 242, the material flow adjustment part 241 is rotated, so that the slopes of the first slope 241A and the second slope 241B can be adjusted to adapt to different sandwich injection molding conditions.

[0046] Specifically, the material flow adjustment part 241 and the extension part 242 are an integrally formed structure, together forming a material flow adjustment shaft, which is installed on the movable mold 220. The movable mold 220 is correspondingly provided with an avoidance groove 222 for avoiding the extension part 242, and the end where the material flow adjustment part 241 is located is inserted into the molding space.

[0047] like Fig.14 and Fig.15 As shown, combined with Figure 6 and Fig. 9In some embodiments of the present application, the material flow adjustment mechanism 240 further includes a rotation driving component 243 for driving the extension portion 242 to rotate. Since the extension portion 242 is located in the air avoidance groove 222, it is easy to be difficult to directly operate its rotation due to the limitation of the installation position. By setting the rotation driving component 243 and setting a corresponding rotation transmission structure between the rotation driving component 243 and the extension portion 242, the extension portion 242 can be indirectly rotated by operating the rotation driving component 243, and then the material flow adjustment portion 241 can be rotated to achieve the dispersion adjustment of the filling material flow. In this way, it is convenient to set the rotation driving component 243 in a relatively easy-to-operate position, such as on the side of the movable mold 220, to facilitate operation.

[0048] Specifically, the free end of the extension part 242 (i.e., the other end opposite to the end where the material flow adjustment part 241 is located) is provided with a gear part 242A, and the rotation driving part 243 is also in the shape of a straight axis, which is inserted into the movable mold 220 and can rotate. A screw part 243A is formed on one end of the rotation driving part 243, and the screw part 243A cooperates with the gear part 242A to drive the extension part 242 to rotate by rotating the rotation driving part 243. The outer end of the rotation driving part 243 is exposed from the movable mold 220, and a cross groove or a straight groove can be formed on the outer end surface so that the rotation driving part 243 can be rotated using a screwdriver or other tools. The rotation driving part 243 adopts this structural form, which is simple in structure and easy to install and operate.

[0049] The gear portion 242A can be a gear installed coaxially with the extension portion 242, or can be composed of a plurality of teeth arranged circumferentially on the free end of the extension portion 242; similarly, the screw portion 243A can be a screw installed coaxially with the rotating drive component 243, or can be composed of a spiral structure formed on the circumferential surface of the rotating drive component 243.

[0050] In some embodiments of the present application, the material flow adjustment mechanism 240 also includes a height adjustment component 244, which is used to drive the extension portion 242 to move along its own axial direction, thereby driving the material flow adjustment portion 241 to move along the axial direction of the extension portion 242, so as to adjust the depth of the material flow adjustment portion 241 inserted into the molding space and change the distance between the material flow adjustment portion 241 and the gate 212.

[0051] When the height adjustment component 244 drives the extension part 242 to move along its own axial direction so that the depth of the material flow adjustment part 241 inserted into the molding space increases, the closer the material flow adjustment part 241 is to the gate 212, the more obvious the material flow dispersion effect is; when the height adjustment component 244 drives the extension part 242 to move along its own axial direction so that the depth of the material flow adjustment part 241 inserted into the molding space decreases, the farther the material flow adjustment part 241 is from the gate 212, the material flow dispersion effect is relatively weaker.

[0052] Specifically, the height adjustment component 244 is also in the shape of a straight axis, which is inserted on the movable mold 220 and can rotate, with one end located inside the movable mold 220, which is called its inner end, and the other end exposed outside the movable mold 220 for operation, which is called its outer end. A cam structure 244A or an elliptical wheel structure is formed on the inner end of the height adjustment component 244, and the outer peripheral surface of the cam or the elliptical wheel contacts the free end surface of the extension part 242. When the height adjustment component 244 is rotated, the extension part 242 is lifted or retracted by the inner end cam or the elliptical wheel, thereby realizing the movement of the extension part 242 along its own axial direction.

[0053] A cross groove or a slotted groove is formed on the outer end surface of the height adjustment component 244 so that a screwdriver or other tools can be used to rotate the rotation driving component 243. The height adjustment component 244 adopting this structural form has a simple structure and is easy to install and operate.

[0054] like Figure 6 and Fig. 9 As shown, the avoidance groove 222 on the movable mold 220 for avoiding the extension part 242 is a multi-step stepped groove, including a small diameter part adapted to the diameter of the extension part 242, a middle diameter part with a diameter slightly larger than the small diameter part, and a large diameter part with the largest diameter. The extension part 242 extends into the molding space through the small diameter part, and the gear part 242A of the extension part 242, the screw part 243A of the rotation driving part 243 and the cam structure 244A (or elliptical wheel structure) of the height adjustment part 244 all extend into the large diameter part; an annular boss 242B located on the middle diameter part of the avoidance groove 222 is formed on the extension part 242, and an elastic part 245 is sleeved on the extension part 242, and the elastic part 245 is clamped between the annular boss 242B and the small diameter part of the avoidance groove 222. When the height adjustment component 244 is used to move the extension part 242 along its axial direction, the elastic component 245 can be driven to deform or restore the deformation. According to the principle of action and reaction, the free end face of the extension part 242 can be reliably abutted against the height adjustment component 244, thereby avoiding axial shaking of the whole formed by the extension part 242 and the material flow adjustment part 241.

[0055] For the TV base 100 after sandwich injection molding, in order to detect whether the internal core layer is filled to standard, the prior art usually requires cutting off the end of the product to observe whether the cross section contains the core layer, or using an X-ray scanner to observe the filling of the internal core layer. Cutting off the product to observe the cross section will destroy the product and is inefficient, which is not suitable for mass production. If an X-ray scanner is used, some core layer materials cannot be detected by the X-ray scanner, thereby limiting its use.

[0056] In order to solve the above-mentioned problems existing in the prior art, in some embodiments of the present application, the fixed mold 210 also includes a detection part cavity 213; correspondingly, the movable mold 220 also includes a detection part core 223, and the detection part core 223 and the detection part cavity 213 enclose a detection part molding space 250 for molding the base detection part 270.

[0057] There are two detection part molding spaces 250, which are respectively located outside the bottom end of the molding area corresponding to the first leg 110 and the bottom end of the molding area corresponding to the second leg 120, and are respectively connected to the molding area corresponding to the first leg 110 and the molding area corresponding to the second leg 120.

[0058] During sandwich injection molding, the filling core layer and the surface layer material will pass through the molding space into the detection part molding space 250, so that the sandwich layer material of the product extends to the end of the product, further improving the support reliability and support strength.

[0059] When testing the formed TV base 100, the base detection part 270 is cut off from the TV base 100 at the connection between the base detection part 270 and the base legs, and the cross section is checked to see whether the core layer material is contained. If the cross section contains the core layer, the core layer filling is qualified. If there is no core layer in the cross section, it means that the core layer filling is insufficient. Since the base detection part 270 itself belongs to the overflow part of the base, it needs to be cut off after the base is formed, which can avoid damaging the main part of the TV base 100, which is conducive to reducing production costs.

[0060] In some embodiments of the present application, the detection part forming space 250 has a hook portion 251, and the hook portion 251 penetrates into the bottom of the forming area of ​​the foot pad positioning groove 140 through the movable mold 220. After the hook portions 251 of the two detection part forming spaces 250 penetrate into the bottom of the forming area of ​​the foot pad positioning groove 140, they are connected to the corresponding forming area of ​​the first leg 110 and the corresponding forming area of ​​the second leg 120 through their free ends. When filling, the filling material extends into the detection part forming space 250 through the hook portion 251 to form the base detection part 270.

[0061] Specifically, if Figure 5 , Figure 7 , Fig.11 , Figures 16 to 18 In the embodiment, a detection part core 223 insert is fixedly provided on the movable mold 220, and the detection part core 223 is formed on the detection part core 223 insert. Since the detection part molding space 250 is a special-shaped structure, for the convenience of processing, the detection part core 223 insert can be composed of two parts.

[0062] To achieve the adjustable size of the detection part molding space 250, such as Fig.16 and Fig.17As shown, an adjustment block 260 is detachably fixed in the detection part core 223, which can be specifically fastened with screws. The adjustment block 260 can be designed in a plurality of different sizes. Different adjustment blocks 260 are selected to be installed in the detection part cores 223 corresponding to the two legs to change the size of each detection part molding space 250, thereby playing a role in assisting in regulating the material flow, making it easy for the filling materials of the two legs to remain consistent and be filled at the same time, thereby enhancing the strength of the product.

[0063] The first leg 110 is long and requires a large amount of material, so a smaller adjustment block 260 can be used. The second leg 120 is short and requires a small amount of material, so a larger adjustment block 260 can be used. They cooperate with each other so that the filling materials of the two legs can be kept as consistent as possible and filled at the same time.

[0064] like Figure 5 and Figure 7 As shown, when the sandwich injection molding of the TV base 100 is completed and the mold is opened, the movable mold 220 moves away from the fixed mold 210. Figure 5 , Figure 7 From the perspective shown, the movable mold 220 moves downward, and the TV base 100 and the base detection part 270 move with the movable mold 220. When the mold is opened to the demolding position, the mold ejector plate drives the product ejector rod and the base detection part ejector rod to perform an ejection action (the ejection action is an oil cylinder ejection or an injection molding machine ejector rod ejection) to eject the product. The hook part 251 is embedded in the movable mold 220, and the corresponding base detection part hook part formed therein is stopped by a part of the detection part core 223 insert, so the base detection part hook part cannot be completely ejected, so that this part is pulled off and the TV base 100 is ejected. The cross section of the base detection part is in the foot pad positioning groove 140, which is a non-appearance surface and will not affect the overall appearance of the product.

[0065] The base detection portion is pulled off during the ejection process of the TV base 100, and there is no need to add a subsequent process of cutting off the base detection portion, thereby facilitating product filling and detection without reducing production efficiency.

[0066] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0067] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A TV stand, characterized in that: include: A first leg, a second leg and a TV connection portion; The TV connection portion is located between the first leg and the second leg, and is respectively connected to the top of the first leg and the top of the second leg; An obtuse angle is formed between the first leg and the second leg, and the length of the first leg is greater than the length of the second leg; The TV base is a sandwich injection molding structure, including a core layer and a surface layer, wherein the surface layer wraps the core layer, the core layer of the TV connection part is aligned with the surface layer of the TV connection part, and the core layer length of the first leg is greater than the core layer length of the second leg.

2. The TV stand according to claim 1, characterized in that: A foot pad positioning groove is formed on the bottom end support surface of the surface of the first leg and the bottom end support surface of the surface of the second leg respectively, and a foot pad is installed in the foot pad positioning groove, and the foot pad protrudes downward from the foot pad positioning groove.

3. A sandwich injection mold for sandwich injection molding the TV base according to claim 1 or 2, characterized in that: include: A fixed mold, the fixed mold comprising a cavity; A movable mold, the movable mold comprising a core, the core and the cavity enclosing a base molding space; The fixed mold is provided with a gate for sequentially injecting the surface material, the core material and the surface material into the base molding space, the gate is connected with the base molding space and is aligned with the molding area corresponding to the TV connection part; The movable mold is provided with a material flow adjustment mechanism, which includes a material flow adjustment part. The material flow adjustment part is located in the molding area corresponding to the TV connection part and is arranged opposite to the gate; the material flow adjustment part has a first slope surface facing the molding area corresponding to the first leg, and a second slope surface facing the molding area corresponding to the second leg, and the slope of the first slope surface is smaller than the slope of the second slope surface.

4. The sandwich injection mold according to claim 3, characterized in that: The material flow adjustment portion is conical, with its small end pointing to the gate and its large end away from the gate; the material flow adjustment portion has a circular cross-section, and a line between its small end and the center of the circular cross-section intersects with the circular cross-section but is not perpendicular to it.

5. The sandwich injection mold according to claim 4, characterized in that: The material flow adjustment part is fixedly connected with an extension part, and the extension part is located outside the base molding space; the cross-section of the extension part is circular, one end of which is fixedly connected to the large end of the material flow adjustment part, and the other end is a free end, and the extension part is coaxial with the large end of the material flow adjustment part; the extension part can rotate to drive the material flow adjustment part to rotate.

6. The sandwich injection mold according to claim 5, characterized in that: The material flow adjustment mechanism also includes a rotation driving component for driving the extension portion to rotate.

7. The sandwich injection mold according to claim 6, characterized in that: The free end of the extension part is provided with a gear part, and one end of the rotation driving component is provided with a screw part, and the screw part cooperates with the gear part, and the extension part is driven to rotate by rotating the rotation driving component.

8. The sandwich injection mold according to claim 6, characterized in that: The material flow adjustment mechanism also includes a height adjustment component for driving the extension portion to move along its axial direction to change the distance between the material flow adjustment portion and the gate.

9. The sandwich injection mold according to claim 3, characterized in that: The fixed mold also includes a detection part cavity; The movable mold further includes a detection part core, and the detection part core and the detection part cavity enclose a detection part molding space for molding the base detection part; There are two molding spaces for the detection part, which are respectively located at the outer side of the bottom end of the molding area corresponding to the first leg and the outer side of the bottom end of the molding area corresponding to the second leg, and are respectively connected to the molding area corresponding to the first leg and the molding area corresponding to the second leg; During the inspection, the base inspection part is cut off to check whether the cross section contains core layer material.

10. The sandwich injection mold according to claim 9, characterized in that: The detection part molding space has a hook portion, and the hook portion penetrates into the bottom of the foot pad positioning groove molding area through the movable mold.

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