Injection Mold and Molding Method for a High-Impact Resistance and Wear-Resistant Folding Logistics Box

Abstract

The present invention discloses an injection mold and a molding method for a high impact-resistant and wear-resistant foldable logistics box, relating to the technical field of injection molds. The aim is to solve the technical problem that when the existing injection mold is used to mold the side plate of a logistics box with a complex structure, the molten plastic flow rate is likely to be slow due to the narrow cavity, affecting the molding effect. It includes a support base, a fixed mold, and a movable mold. The fixed mold is arranged on the top of the support base, and the fixed mold and the side wall of the support base are connected by a plurality of guide rods. The movable mold is movably arranged on the guide rods. The side wall of the fixed mold is provided with an outer convex mold, and an extrusion cavity is opened on the side wall of the fixed mold. An injection hole is opened on the side wall of the extrusion cavity. An inner mold groove is opened on the side wall of the movable mold, and the top of the inner mold groove extends to the top of the movable mold. An extrusion insert is movably arranged in the inner mold groove. The present invention has the advantage that it can still injection-mold the side plate of a logistics box with a complex structure without the molten plastic passing through a relatively narrow cavity with many paths.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and more specifically, to an injection mold and a molding method for a high impact-resistant and wear-resistant folding logistics box. Background Art

[0002] At present, with the booming development of the logistics industry, the performance requirements for logistics boxes are becoming increasingly stringent. High impact-resistant and wear-resistant folding logistics boxes are favored by the market due to their excellent physical properties and convenient storage characteristics.

[0003] As shown in the accompanying drawings of the specification Figures 1-2 , Figure 1 is a schematic diagram of the overall structure of a high impact-resistant and wear-resistant folding logistics box, Figure 2 is a schematic diagram of the side plate structure of the logistics box. The logistics box includes a base and four side plates. The side plates are connected to the base through a hinge structure. The side plates of the logistics box are of a multi-layer structure, the outer layer of which is a grid-like structure composed of regularly arranged grids. This grid-like structure helps to reduce the weight while ensuring a certain strength. The inner layer connected to the outer grid-like structure is a flat plate, and the inside of the flat plate is a hollow structure. A plurality of connecting ribs are arranged in the hollow structure, and the connecting ribs enhance the stability of the hollow structure. The flat plate forms a double-layer plate structure through the hollow structure. Even if one layer of the plate is cracked by impact, the other layer of the plate can still maintain its normal use function, and the associated damage caused by impact between the two is relatively small, making the side plate of the logistics box have better impact resistance and wear resistance.

[0004] Existing injection molds usually consist of a fixed mold and a movable mold. After the fixed mold and the movable mold are closed, a cavity in the shape of the product is formed. The molten plastic is injected into the cavity by an injection molding machine. After the molten plastic cools and forms, the mold is opened and the product is demolded, etc., to obtain the produced product. However, when the conventional injection mold is used to mold the side plate of the above-mentioned logistics box, due to the special shape of the side plate of the logistics box, the grid-like structure on the outer layer and the hollow structure inside the flat plate will both cause the cavity channels formed by the mold to be relatively narrow and have more flow paths. This narrow multi-path channel is likely to cause the flow rate of the molten plastic to be slower, and then the molten plastic that has not been fully circulated may be in a state of local cooling and forming, affecting the forming effect. In view of this, we propose an injection mold and a molding method for a high impact-resistant and wear-resistant folding logistics box. Summary of the Invention

[0005] The purpose of the present invention is to provide an injection mold and a molding method for a high impact-resistant and wear-resistant folding logistics box, so as to solve the technical problem that when the existing injection mold is used to mold the side plate of a logistics box with a complex structure, the flow rate of the molten plastic is likely to be slower due to the narrow cavity, affecting the forming effect.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: an injection mold for a highly impact-resistant and wear-resistant foldable logistics box, comprising a support base, a fixed mold and a movable mold. The fixed mold is arranged on the top of the support base, and the fixed mold and the side wall of the support base are connected by a plurality of guide rods. The movable mold is movably arranged on the guide rods. An outer convex mold is arranged on the side wall of the fixed mold, and the outer convex mold is used to form the outer grid structure of the side plate of the logistics box. An extrusion cavity is formed on the side wall of the fixed mold, and an injection hole is formed on the side wall of the extrusion cavity. An inner mold cavity is formed on the side wall of the movable mold, and the inner mold cavity is used to form the inner plane structure of the side plate of the logistics box. The top of the inner mold cavity extends to the top of the movable mold, and an extrusion insert is movably arranged in the inner mold cavity. The extrusion insert includes an inner cavity template, and the inner cavity template is used to form the hollow layer of the side plate of the logistics box. When the movable mold and the fixed mold are closed, the inner mold cavity and the outer convex mold form an appearance cavity, and an extrusion channel is formed between the upper end of the inner mold cavity and the extrusion cavity. The appearance cavity is used to form the outer shape of the side plate of the logistics box, and the extrusion insert can move in the extrusion channel. When the extrusion insert is pressed down, it can drive the inner cavity template to insert into the molten plastic in the appearance cavity, forming a hollow layer for the molten plastic. The inner cavity template and the appearance cavity form the structural shape of the side plate of the logistics box.

[0007] Preferably, a first cylinder is arranged on the support base, and the output end of the first cylinder is connected to the side wall of the movable mold. An injection molding machine is arranged on the top of the support base, and the output end of the barrel of the injection molding machine is communicated with the injection hole. The injection molding machine is used to heat the plastic raw material into a molten plastic with fluidity in the barrel and inject the molten plastic into the appearance cavity through the injection hole.

[0008] Preferably, the bottom of the movable mold is slidably connected to the top of the support base. A plurality of L-shaped grooves are formed on the side wall of the movable mold, and a recycling chute is arranged on the other side wall of the movable mold. A plurality of fixing plates are arranged on the top of the movable mold, and sliding ridges are connected to the side walls of the fixing plates. A second cylinder is also arranged on the top of the movable mold.

[0009] Preferably, the extrusion insert includes a sliding frame, the bottom of the sliding frame is connected to the inner cavity template, the sliding frame is movably sleeved on the fixing plate, a first sliding groove is arranged on the inner side wall of the sliding frame, and the first sliding groove is slidably matched with the sliding ridge. The output end of the second cylinder is connected to the sliding frame, and an inclined pressing plate is connected to the side wall of the sliding frame. The top surface and the bottom surface of the inclined pressing plate are set as mutually parallel inclined plane structures, and a plurality of plastic discharging holes are formed in the inclined pressing plate from top to bottom. The plastic discharging holes are used to discharge the redundant molten plastic in the appearance cavity.

[0010] Preferably, a second recycling chute is arranged on the side wall of the fixed mold. When the moving mold and the fixed mold are clamped, the first recycling chute and the second recycling chute are combined to form a plastic recycling channel.

[0011] Preferably, a sloping plate is arranged on the side wall of the fixed mold. The top of the sloping plate is of an inclined surface structure, and the inclination angle of the top of the sloping plate is the same as that of the top of the inclined pressing plate. By moving the extrusion plug plate upward in the extrusion channel, the top of the inclined pressing plate can be aligned with the top of the sloping plate; a pushing plate is arranged above the sloping plate. One side wall of the pushing plate is connected with a plurality of sliders and driving blocks. The bottom of the pushing plate is of an inclined surface structure and is attached to the inclined surface at the top of the sloping plate. The other side wall of the pushing plate is connected with a pushing pull rod, and the end of the pushing pull rod is connected with a piston; a plurality of second sliding grooves and strip-shaped holes are formed in the upper side wall of the extrusion cavity. The sliders are slidably arranged in the second sliding grooves, and the driving blocks movably penetrate through the strip-shaped holes.

[0012] Preferably, a third cylinder and an air cylinder are further arranged on the top of the fixed mold; the output end of the third cylinder is connected with the driving block; the inner cavity of the air cylinder includes an air storage cavity and an air outlet cavity. The output end of the air storage cavity is communicated with the air outlet cavity. The pushing pull rod movably penetrates through the side wall of the air cylinder and extends into the air storage cavity. The piston is slidably matched with the circumferential inner wall of the air storage cavity; wherein, the air outlet cavity is of a gradually shrinking slender channel structure, and the output end of the air outlet cavity is connected with an air spraying pipe, and the output end of the air spraying pipe is arranged above the second recycling chute.

[0013] Preferably, the bottom of the extrusion cavity is of an inclined surface structure, and the slope of the inclined surface structure is the same as that of the bottom inclined surface structure of the inclined pressing plate. A plurality of top holes are formed in the inclined surface structure at the bottom of the extrusion cavity. A plurality of L-shaped grooves II communicated with the bottom of the top holes are formed in the lower end of the side wall of the fixed mold. A top material ventilation rod is movably arranged in the top holes, and the bottoms of the plurality of top material ventilation rods are connected through a lifting block; the top of the top material ventilation rod is of an inclined surface structure, and the slope of the inclined surface structure is the same as that of the inclined surface structure at the bottom of the extrusion cavity. An air ventilation groove is formed in the side wall of the top material ventilation rod, and the air ventilation groove is communicated with the L-shaped groove II; wherein, the lifting block can perform lifting activities. When the lifting block descends to the lowest position, the top of the top material ventilation rod and the top of the top hole form a planar structure, and the air ventilation groove is located in the inner cavity of the top hole, so that a closed state is formed between the inner cavity of the top hole and the extrusion cavity; when the lifting block ascends to the highest position, the top of the top material ventilation rod penetrates through the plastic discharging hole of the inclined pressing plate to eject the plastic in the plastic discharging hole. At the same time, the air ventilation groove is located above the top hole, so that a communicating state is formed between the inner cavity of the top hole and the extrusion cavity.

[0014] Preferably, a support plate is connected to the bottom of the fixed mold. A motor is arranged above the support plate. A lead screw is rotatably arranged between the top of the support plate and the bottom of the fixed mold. The output end of the motor is connected to a first gear, and the bottom of the lead screw is connected to a second gear. The first gear is meshed with the second gear. A moving block is threadedly connected to the lead screw, and the moving block is connected to the side wall of the lifting block. The lifting block is slidably arranged on the lower side wall of the fixed mold.

[0015] A molding method for an injection mold of a high impact-resistant and wear-resistant folding logistics box includes the following steps:

[0016] S1. First-stage mold closing operation: The moving mold is driven by a first cylinder to slide on multiple guide rods, so that the moving mold and the fixed mold form a mold-closed state. The inner mold cavity and the outer convex mold form an appearance cavity, and an extrusion channel is formed between the upper end of the inner mold cavity and the extrusion cavity.

[0017] S2. Injection molding operation: The plastic raw material is heated to a molten state by the barrel of an injection molding machine, and the molten plastic is injected into the appearance cavity through an injection hole until the appearance cavity is filled with the molten plastic.

[0018] S3. Second-stage mold closing operation: The carriage is driven by a second cylinder to move downward along the sliding rib, driving the inner cavity template to insert into the appearance cavity until the inclined pressing plate presses down on the bottom of the extrusion cavity. At this time, the inner cavity template and the appearance cavity form the structural shape of the side plate of the logistics box. During the process of the inner cavity template inserting into the appearance cavity, the molten plastic in the appearance cavity can be extruded. The extruded molten plastic can fully fill the outer convex mold, and the excess molten plastic is discharged from the plastic discharge hole of the inclined pressing plate.

[0019] S4. Remaining material cleaning operation: After the molten plastic is cooled and molded and before the mold opening operation, first, the lifting block rises, driving multiple ejector vent rods to respectively insert upward from the top holes, penetrate the plastic discharge holes of the inclined pressing plate, and eject the solidified plastic in the plastic discharge holes until the lifting block rises to the highest position and stops. At this time, one end of the vent groove on the side wall of the ejector vent rod is communicated with the second L-shaped groove, and the other end is located in the plastic discharge hole of the inclined pressing plate above the top hole, preventing the remaining material on the top of the inclined pressing plate from entering the vent groove. Then, the carriage rises, separating the vent groove from the plastic discharge hole, and the inner cavity of the top hole is communicated with the extrusion cavity through the vent groove, preventing negative pressure from being formed in the mold cavity and making it difficult for the carriage to rise. Until the top of the inclined pressing plate and the top of the inclined plate are aligned, the carriage stops moving. At this time, the plastic remaining material remains on the top of the inclined pressing plate, and the plastic remaining material is pushed out by a push plate for collection and reuse. After the remaining material is cleaned, the moving mold and the fixed mold are opened to take out the product.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. Through the clamping of the moving mold and the fixed mold in the present invention, the inner groove and the outer convex mold form an appearance cavity, and this appearance cavity is only the outer surface shape of the side plate of the logistics box, so that the appearance cavity is similar to a directional notch, with a relatively spacious interior, facilitating the rapid inflow of molten plastic. At this time, by injecting the molten plastic into the appearance cavity, the molten plastic can fill the entire appearance cavity while maintaining good fluidity. Then, by pressing down the extrusion plate, the inner cavity template is inserted into the molten plastic in the appearance cavity to form a hollow layer for the molten plastic. Moreover, under the extrusion of the inner cavity template, the molten plastic can fully fill the grid-like channels of the entire outer convex mold in its state of good fluidity to form the outer grid structure of the side plate of the logistics box. After the molten plastic gradually cools, a side plate of the logistics box with a hollow layer is finally formed. By changing the traditional injection molding method of the injection mold and adopting the method of injection first and then shaping, the present invention greatly avoids the phenomenon that the molten plastic needs to flow through a relatively narrow cavity with many paths, which easily leads to local premature cooling and molding failure.

[0022] 2. In the present invention, the air cylinder three drives the driving block to move forward, the driving block drives the pushing plate to move forward, and the pushing plate pushes the excess plastic at the top of the inclined pressing plate forward, pushing the excess plastic into the plastic recovery channel for collection and reuse. When the air cylinder three pulls the driving block back, it drives the pushing plate to move back to its original position. The pushing plate drives the piston to move in the air storage cavity through the push rod. The piston compresses the air in the air storage cavity, causing the air to flow into the air outlet cavity. Since the air outlet cavity is a gradually contracting slender channel structure, the cross-section of the air flow gradually shrinks. With the air flow rate unchanged, under the push of the piston, the air flow velocity increases, and the rapidly flowing air is ejected from the air injection pipe to clean the small particle plastics that may remain on the plastic recovery channel, preventing the small particle plastics from falling onto the formed side plate of the logistics box during mold opening and affecting the product quality. Through the pushing and pulling action of the air cylinder three on the driving block, it can drive the pushing plate to push out the excess plastic, drive the air cylinder to output rapidly flowing gas from the air injection pipe, and clean the small particle plastics, effectively cleaning the excess plastic.

[0023] 3. In the present invention, by designing the ejector vent rod and controlling the position of the ejector vent rod by the lifting of the lifting block, when the lifting block descends to the lowest position, the top of the ejector vent rod and the top of the ejector hole form a planar structure. At this time, the vent groove is located in the inner cavity of the ejector hole, forming a closed state between the inner cavity of the ejector hole and the extrusion cavity. In this state, the sealing state of the appearance cavity can be guaranteed. When injecting the molten plastic into the appearance cavity, it is difficult for the molten plastic to enter the ejector hole. And as the inner cavity template is inserted into the molten plastic in the appearance cavity, the molten plastic is extruded and rises, and the excess molten plastic can smoothly drain out from the multiple plastic discharge holes of the inclined pressing plate and enter the top of the inclined pressing plate, ensuring the reliability of the injection process and the mold clamping process between the inner cavity template and the appearance cavity.

[0024] 4. The present invention designs a knockout vent rod. After the molten plastic cools and forms, the lifting block rises to the highest position, causing the top of the knockout vent rod to penetrate through the plastic discharge hole of the inclined pressing plate, and ejecting the plastic in the plastic discharge hole, thus solving the problem that it is difficult to clean the solidified plastic in the plastic discharge hole. As the carriage rises, it drives the inclined pressing plate to rise. During the rising process of the inclined pressing plate, the knockout vent rod always remains in the plastic discharge hole, keeping the excess plastic on the top of the inclined pressing plate all the time, avoiding the situation that small pieces of plastic fall through the plastic discharge hole. Moreover, the top of the ventilation groove is located above the top hole, forming a communication state between the inner cavity of the top hole and the extrusion cavity. The bottom of the ventilation groove is still connected to the second L-shaped groove. The connected first L-shaped groove and the second L-shaped groove ensure the communication between the ventilation groove and the outside air, and further make the appearance cavity communicate with the outside air, so it is difficult to form negative pressure in the appearance cavity, solving the problem that it is difficult for the carriage to rise due to the easy generation of negative pressure in the appearance cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the overall structural schematic diagram of a high impact-resistant and wear-resistant folding logistics box of the present invention;

[0026] Figure 2 is the side plate structural schematic diagram of the logistics box of the present invention;

[0027] Figure 3 is the overall structural schematic diagram of the injection mold of the present invention;

[0028] Figure 4 is the combined mold state structural schematic diagram of the fixed mold and the moving mold of the present invention;

[0029] Figure 5 is the mold parting state structural schematic diagram of the fixed mold and the moving mold of the present invention;

[0030] Figure 6 is the structural schematic diagram of the moving mold and the extrusion insert plate of the present invention;

[0031] Figure 7 is the disassembled structural schematic diagram of the moving mold and the extrusion insert plate of the present invention;

[0032] Figure 8 is the structural schematic diagram of the extrusion insert plate of the present invention;

[0033] Figure 9 is the structural schematic diagram of the fixed mold of the present invention;

[0034] Figure 10 is the cross-sectional structural schematic diagram of the air cylinder of the present invention;

[0035] Figure 11 is the structural schematic diagram of the push plate of the present invention;

[0036] Figure 12Schematic diagram of the top hole and L-shaped groove II of the present invention;

[0037] Figure 13 Schematic diagram of the lead screw drive structure of the present invention;

[0038] Figure 14 Schematic diagram of the ventilation groove structure of the present invention;

[0039] Figure 15 Schematic diagram of the lifting block structure of the present invention;

[0040] Figure 16 Schematic diagram of the sectional structure of the moving mold and the fixed mold in the closed state of the present invention;

[0041] Figure 17 Schematic diagram of the sectional structure of the inner cavity template and the outer cavity in the closed state of the present invention;

[0042] Figure 18 Schematic diagram of the sectional structure of a use state of the ejector ventilation rod of the present invention.

[0043] Explanation of the reference numerals in the figure:

[0044] 1, side plate of the logistics box; 2, support seat; 3, fixed mold; 5, guide rod; 4, moving mold; 6, extrusion insertion plate;

[0045] 201, cylinder I;

[0046] 301, outer convex mold; 302, extrusion cavity; 303, injection hole; 304, recycling chute II; 305, inclined plate; 306, push plate; 307, slider; 308, push-pull rod; 309, piston; 310, drive block; 311, sliding groove II; 312, strip hole; 313, cylinder III; 314, air cylinder; 315, air storage cavity; 316, air outlet cavity; 317, air injection pipe; 318, top hole; 319, ejector ventilation rod; 320, lifting block; 321, L-shaped groove II; 322, support plate; 323, motor; 324, lead screw; 325, gear I; 326, gear II; 327, moving block; 328, ventilation groove;

[0047] 401, inner groove; 402, L-shaped groove I; 403, recycling chute I; 404, fixing plate; 405, sliding convex strip; 406, cylinder II;

[0048] 601, inner cavity template; 602, sliding frame; 603, sliding groove I; 604, inclined pressing plate; 605, plastic discharging hole. Detailed implementation manners

[0049] Example 1, as Figures 1 to 18As shown in the figure, this embodiment provides an injection mold for a high impact-resistant and wear-resistant folding logistics box, which includes a support base 2, a fixed mold 3, and a movable mold 4. The fixed mold 3 is arranged on the top of the support base 2, and the fixed mold 3 is connected to the side wall of the support base 2 through a plurality of guide rods 5. The movable mold 4 is movably arranged on the guide rods 5;

[0050] Specifically, as Figure 9 shown, the side wall of the fixed mold 3 is provided with an outer convex mold 301. The outer convex mold 301 is composed of a plurality of protruding structures. The channels between the plurality of protruding structures form a grid-like structure. The outer convex mold 301 is used to form the outer grid structure of the side plate 1 of the logistics box; an extrusion cavity 302 is opened on the side wall of the fixed mold 3, and an injection hole 303 is opened on the side wall of the extrusion cavity 302; further, as Figure 6 shown, an inner mold cavity 401 is opened on the side wall of the movable mold 4. The inner mold cavity 401 is used to form the inner plane structure of the side plate 1 of the logistics box; the top of the inner mold cavity 401 extends to the top of the movable mold 4, and an extrusion insert 6 is movably arranged in the inner mold cavity 401; further, as Figure 8 shown, the extrusion insert 6 includes an inner cavity template 601. The inner cavity template 601 is used to form the hollow layer of the side plate 1 of the logistics box;

[0051] It should be noted that when the movable mold 4 and the fixed mold 3 are closed, the inner mold cavity 401 and the outer convex mold 301 form an appearance cavity, and the upper end of the inner mold cavity 401 and the extrusion cavity 302 form an extrusion channel; the appearance cavity is used to form the outer shape of the side plate 1 of the logistics box, and the extrusion insert 6 can move in the extrusion channel; when the extrusion insert 6 is pressed down, it can drive the inner cavity template 601 to insert into the molten plastic in the appearance cavity, forming a hollow layer for the molten plastic. The inner cavity template 601 and the appearance cavity form the structural shape of the side plate 1 of the logistics box.

[0052] In the present invention, through the mold closing of the moving mold 4 and the fixed mold 3, the inner groove 401 and the outer convex mold 301 form an appearance cavity, and this appearance cavity is only the outer surface shape of the side plate 1 of the logistics box, so that this appearance cavity is similar to a directional notch and is relatively spacious inside, facilitating the rapid inflow of molten plastic. At this time, by injecting the molten plastic into the appearance cavity, the molten plastic can fill the entire appearance cavity while maintaining a good fluidity state. Then, by pressing down the extrusion insert plate 6, the inner cavity template 601 is inserted into the molten plastic in the appearance cavity to form a hollow layer for the molten plastic. Moreover, under the extrusion action of the inner cavity template 601 and in its state of good fluidity, the molten plastic can fully fill the grid-shaped channels of the entire outer convex mold 301 to form the outer grid structure of the side plate 1 of the logistics box. When the molten plastic gradually cools, the side plate 1 of the logistics box with a hollow layer is finally formed. By changing the traditional molding method of the injection mold and through the method of injection molding first and then shaping, the present invention greatly avoids the phenomenon that the molten plastic needs to flow through a relatively narrow cavity with many paths, which easily leads to local premature cooling and molding failure.

[0053] In an embodiment of the present invention, a first cylinder 201 is arranged on the support base 2, and the output end of the first cylinder 201 is connected to the side wall of the moving mold 4; a top of the support base 2 is provided with an injection molding machine, which is prior art in the example and will not be elaborated. The output end of the barrel of the injection molding machine is communicated with the injection hole 303. The injection molding machine is used to heat the plastic raw material into a molten plastic with fluidity in the barrel and inject the molten plastic into the appearance cavity through the injection hole 303.

[0054] In an embodiment of the present invention, the bottom of the moving mold 4 is slidably connected to the top of the support base 2. A chute is opened at the bottom of the moving mold 4, and corresponding sliders are arranged on the top of the support base 2. The moving mold 4 slides on the sliders at the top of the support base 2 through the chute at its bottom. A plurality of L-shaped grooves 402 are opened on the side wall of the moving mold 4, a recycling chute 403 is arranged on the other side wall of the moving mold 4, a plurality of fixing plates 404 are arranged on the top of the moving mold 4, a sliding convex strip 405 is connected to the side wall of the fixing plate 404, and a second cylinder 406 is also arranged on the top of the moving mold 4.

[0055] As another embodiment of the present invention, the extrusion plug plate 6 includes a carriage 602. The bottom of the carriage 602 is connected to the inner cavity template 601. The carriage 602 is movably sleeved on the fixed plate 404. A first sliding groove 603 is arranged on the inner side wall of the carriage 602. The first sliding groove 603 is in sliding fit with the sliding rib 405. The output end of the second cylinder 406 is connected to the carriage 602. The lifting of the carriage 602 is controlled by the second cylinder 406, so as to control the insertion and separation of the inner cavity template 601 into and from the outer cavity mold. A tilt pressing plate 604 is connected to the side wall of the carriage 602. The top surface and the bottom surface of the tilt pressing plate 604 are provided with inclined plane structures that are parallel to each other. A plurality of plastic discharge holes 605 are formed in the tilt pressing plate 604 from top to bottom. The plastic discharge holes 605 are used to discharge the excess molten plastic in the outer cavity mold. When the carriage 602 drives the inner cavity template 601 to insert into the outer cavity mold, as the carriage 602 descends, the air above the outer cavity mold is squeezed out through the plurality of plastic discharge holes 605 of the tilt pressing plate 604. Moreover, along with the molten plastic when the inner cavity template 601 inserts into the outer cavity mold, the molten plastic is squeezed and rises, that is, excess molten plastic is generated. As the carriage 602 continues to press down, the excess molten plastic will gradually be discharged through the plurality of plastic discharge holes 605 of the tilt pressing plate 604 and enter the top of the tilt pressing plate 604.

[0056] In an embodiment of the present invention, a second recycling chute 304 is arranged on the side wall of the fixed mold 3. When the moving mold 4 and the fixed mold 3 are clamped, the first recycling chute 403 and the second recycling chute 304 are combined to form a plastic recycling channel.

[0057] In an embodiment of the present invention, an inclined plate 305 is arranged on the side wall of the fixed mold 3. The top of the inclined plate 305 is an inclined plane structure. The inclination angle of the top of the inclined plate 305 is the same as the inclination angle of the top of the tilt pressing plate 604. By moving the extrusion plug plate 6 upward in the extrusion channel, the top of the tilt pressing plate 604 can be aligned with the top of the inclined plate 305 to form a channel for cleaning the excess plastic.

[0058] Specifically, a pushing plate 306 is arranged above the inclined plate 305. A plurality of sliders 307 and driving blocks 310 are connected to one side wall of the pushing plate 306. The bottom of the pushing plate 306 is an inclined plane structure and is fitted with the inclined plane at the top of the inclined plate 305. A push-pull rod 308 is connected to the other side wall of the pushing plate 306. A piston 309 is connected to the end of the push-pull rod 308. A plurality of second sliding grooves 311 and strip-shaped holes 312 are formed in the upper side wall of the extrusion cavity 302. The sliders 307 are slidably arranged in the second sliding grooves 311, and the driving blocks 310 movably penetrate through the strip-shaped holes 312.

[0059] Furthermore, a third cylinder 313 and a cylinder barrel 314 are also arranged on the top of the fixed mold 3; the output end of the third cylinder 313 is connected to the driving block 310; an air inlet hole is formed in the side wall of the cylinder barrel 314, and the inner cavity of the cylinder barrel 314 includes a gas storage cavity 315 and an air outlet cavity 316. The output end of the gas storage cavity 315 is communicated with the air outlet cavity 316. The push-pull rod 308 movably penetrates through the side wall of the cylinder barrel 314 and extends into the gas storage cavity 315. The piston 309 is slidably matched with the inner circumferential wall of the gas storage cavity 315. Among them, the air outlet cavity 316 is a gradually shrinking slender channel structure. The output end of the air outlet cavity 316 is connected with a jet pipe 317. The output end of the jet pipe 317 is arranged above the second recycling chute 304. The output direction of the jet pipe 317 is aligned with the plastic recycling channel formed by the merger of the first recycling chute 403 and the second recycling chute 304.

[0060] In the present invention, after the molten plastic is cooled and molded, the upward movement of the carriage 602 drives the inner cavity template 601 to leave the hollow layer of the formed side plate 1 of the logistics box until the carriage 602 rises to the top, aligning the top of the inclined pressing plate 604 with the top of the inclined plate 305. Then, the third cylinder 313 is used to push the driving block 310 forward. The driving block 310 drives the pushing plate 306 to move forward. The pushing plate 306 pushes the excess plastic at the top of the inclined pressing plate 604 forward, pushing the excess plastic into the plastic recycling channel for collection and reuse. When the third cylinder 313 pulls the driving block 310 back, it drives the pushing plate 306 to move back to its original position. When the pushing plate 306 moves back, the pushing plate 306 pushes the piston 309 to move in the gas storage cavity 315 through the push-pull rod 308. The piston 309 compresses the air in the gas storage cavity 315, causing the air to flow into the air outlet cavity 316. Since the air outlet cavity 316 is a gradually shrinking slender channel structure, the cross-section of the air flow gradually shrinks. With the air flow rate remaining unchanged, under the push of the piston 309, the air flow velocity increases. The rapidly flowing air is ejected from the jet pipe 317 to clean the small particle plastics that may remain on the plastic recycling channel, preventing the small particle plastics from falling onto the formed side plate 1 of the logistics box during mold opening and affecting the product quality. Through the forward and backward movement of the third cylinder 313 on the driving block 310, the pushing plate 306 can be driven to push out the excess plastic, and the cylinder barrel 314 can be driven to output rapidly flowing gas from the jet pipe 317 to clean the small particle plastics, effectively cleaning up the excess plastic.

[0061] In an embodiment of the present invention, the bottom of the extrusion cavity 302 is provided with an inclined surface structure, and the slope of the inclined surface structure is the same as that of the bottom inclined surface structure of the inclined pressing plate 604. The inclined surface structure at the bottom of the extrusion cavity 302 can guide the molten plastic injected from the injection hole 303 to flow into the appearance cavity, and at the same time avoid the retention of the molten plastic in the extrusion cavity 302. A plurality of top holes 318 are formed in the inclined surface structure at the bottom of the extrusion cavity 302, and a plurality of L-shaped grooves II 321 communicating with the bottoms of the top holes 318 are formed in the lower end of the side wall of the fixed mold 3. When the moving mold 4 and the fixed mold 3 are clamped, the L-shaped groove I 402 and the L-shaped groove II 321 are in a communicating state, which can ensure that the L-shaped groove I 402 and the L-shaped groove II 321 in the communicating state are communicated with the outside air. A top material ventilation rod 319 is movably arranged in the top hole 318, and the bottoms of the plurality of top material ventilation rods 319 are connected through a lifting block 320; the top of the top material ventilation rod 319 is provided with an inclined surface structure, and the slope of the inclined surface structure is the same as that of the inclined surface structure at the bottom of the extrusion cavity 302. A ventilation groove 328 is formed in the side wall of the top material ventilation rod 319, and the ventilation groove 328 is communicated with the L-shaped groove II 321;

[0062] Among them, the lifting block 320 can perform lifting activities. When the lifting block 320 descends to the lowest position, the top of the top material ventilation rod 319 and the top of the top hole 318 form a flat surface structure, and the ventilation groove 328 is located in the inner cavity of the top hole 318, so that a closed state is formed between the inner cavity of the top hole 318 and the extrusion cavity 302; when the lifting block 320 ascends to the highest position, the top of the top material ventilation rod 319 penetrates through the plastic discharge hole 605 of the inclined pressing plate 604 to eject the plastic in the plastic discharge hole 605. At the same time, the ventilation groove 328 is located above the top hole 318, so that a communicating state is formed between the inner cavity of the top hole 318 and the extrusion cavity 302.

[0063] In the present invention, by designing a knockout vent rod 319, the position of the knockout vent rod 319 is controlled by the lifting of a lifting block 320. When the lifting block 320 descends to the lowest position, the top of the knockout vent rod 319 and the top of a knockout hole 318 form a planar structure. At this time, a vent groove 328 is located in the inner cavity of the knockout hole 318, so that a closed state is formed between the inner cavity of the knockout hole 318 and an extrusion cavity 302. In this state, when injecting molten plastic into an appearance cavity, it is difficult for the molten plastic to enter the knockout hole 318. And as the molten plastic in the inner cavity template 601 is inserted into the molten plastic in the appearance cavity, the molten plastic is squeezed and rises, and the excess molten plastic can smoothly drain out through a plurality of plastic drainage holes 605 of an inclined pressing plate 604 and enter the top of the inclined pressing plate 604. When the molten plastic cools and solidifies, by raising the lifting block 320 to the highest position, the top of the knockout vent rod 319 penetrates through the plastic drainage holes 605 of the inclined pressing plate 604 to eject the plastic in the plastic drainage holes 605, solving the problem that it is difficult to clean the solidified plastic in the plastic drainage holes 605. As a carriage 602 rises, it drives the inclined pressing plate 604 to rise. During the rising process of the inclined pressing plate 604, the knockout vent rod 319 always remains in the plastic drainage holes 605, so that the excess plastic always remains at the top of the inclined pressing plate 604, avoiding the situation where small pieces of plastic fall through the plastic drainage holes 605. And the top of the vent groove 328 is located above the knockout hole 318, so that a communication state is formed between the inner cavity of the knockout hole 318 and the extrusion cavity 302. The bottom of the vent groove 328 is still connected to an L-shaped groove two 321. The L-shaped groove one 402 and the L-shaped groove two in the communication state ensure the communication between the vent groove 328 and the outside air, and further enable the appearance cavity to communicate with the outside air, making it difficult to form a negative pressure in the appearance cavity and solving the problem that it is difficult for the carriage 602 to rise due to the easy generation of negative pressure in the appearance cavity.

[0064] As another embodiment of the present invention, a support plate 322 is connected to the bottom of a fixed mold 3. A motor 323 is arranged above the support plate 322. A lead screw 324 is rotatably arranged between the top of the support plate 322 and the bottom of the fixed mold 3. The output end of the motor 323 is connected to a gear one 325. The bottom of the lead screw 324 is connected to a gear two 326. The gear one 325 is meshed and connected with the gear two 326. A moving block 327 is threadedly connected to the lead screw 324. The moving block 327 is connected to the side wall of the lifting block 320. The lifting block 320 is slidably arranged on the lower side wall of the fixed mold 3. A chute is arranged on the side wall of the lifting block 320. A slider is arranged on the lower side wall of the fixed mold 3. The lifting block 320 slides on the slider through the chute. In the present invention, the motor 323 is driven to rotate the gear one 325, driving the gear two 326 to rotate, and further driving the lead screw 324 to rotate. The rotation of the lead screw 324 is used to drive the moving block 327 to move along the direction of the lead screw 324, thereby controlling the lifting of the lifting block​320.

[0065] Embodiment two, this embodiment provides a molding method for an injection mold of a high impact resistance and wear-resistant folding logistics box, including the following steps:

[0066] S1. First-stage mold clamping operation: The moving mold 4 is driven by the cylinder 1 201 to slide on multiple guide rods 5, so that the moving mold 4 and the fixed mold 3 form a mold-clamped state. The inner groove 401 and the outer convex mold 301 form an appearance cavity, and the upper end of the inner groove 401 and the extrusion cavity 302 form an extrusion channel.

[0067] S2. Injection molding operation: The plastic raw material is heated to a molten state by the barrel of the injection molding machine, and the molten plastic is injected into the appearance cavity through the injection hole 303 until the appearance cavity is filled with the molten plastic.

[0068] S3. Second-stage mold clamping operation: The carriage 602 is driven by the cylinder 2 406 to move downward along the sliding rib 405, driving the inner cavity template 601 to insert into the appearance cavity until the inclined pressing plate 604 presses down on the inner bottom of the extrusion cavity 302. At this time, the inner cavity template 601 and the appearance cavity form the structural shape of the side plate 1 of the logistics box. During the process of the inner cavity template 601 inserting into the appearance cavity, the molten plastic in the appearance cavity can be extruded. The extruded molten plastic can fully fill the outer convex mold 301, and the excess molten plastic is discharged from the plastic discharge hole 605 of the inclined pressing plate 604.

[0069] S4. Remnant material cleaning operation: After the molten plastic is cooled and formed, before the mold opening operation, first, the lifting block 320 rises, driving the plurality of ejector vent rods 319 to respectively insert upward from the top holes 318, passing through the plastic discharge hole 605 of the inclined pressing plate 604, and ejecting the solidified plastic in the plastic discharge hole 605 until the lifting block 320 rises to the highest position and stops. At this time, one end of the vent groove 328 on the side wall of the ejector vent rod 319 is communicated with the L-shaped groove 2 321, and the other end is located in the plastic discharge hole 605 of the inclined pressing plate 604 above the top hole 318, preventing the remnant material on the top of the inclined pressing plate 604 from entering the vent groove 328. Then, the carriage 602 rises, separating the vent groove 328 from the plastic discharge hole 605, and the inner cavity of the top hole 318 and the extrusion cavity 302 are communicated through the vent groove 328, preventing the formation of negative pressure in the mold cavity and making it difficult for the carriage 602 to rise. Until the top of the inclined pressing plate 604 and the top of the inclined plate 305 are aligned, the carriage 602 stops moving. At this time, the plastic remnant material remains on the top of the inclined pressing plate 604, and the plastic remnant material is pushed out by the push plate 306 for collection and reuse. After the remnant material cleaning is completed, the mold opening operation is performed to take out the product.

[0070] The embodiments disclosed in the present invention are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention according to the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. An injection mold for a high-impact resistant and wear-resistant folding logistics box, characterized in that, It includes a support base, a fixed mold and a movable mold. The fixed mold is arranged on the top of the support base. The fixed mold and the side wall of the support base are connected by a plurality of guide rods. The movable mold is movably arranged on the guide rods. The side wall of the fixed mold is provided with an outer convex mold, and the outer convex mold is used to form the outer grid structure of the side plate of the logistics box. An extrusion cavity is opened on the side wall of the fixed mold, and an injection hole is opened on the side wall of the extrusion cavity. An inner mold groove is opened on the side wall of the movable mold, and the inner mold groove is used to form the inner plane structure of the side plate of the logistics box. The top of the inner mold groove extends to the top of the movable mold, and an extrusion plug is movably arranged in the inner mold groove. The extrusion plug includes an inner cavity template, and the inner cavity template is used to form the hollow layer of the side plate of the logistics box. When the movable mold and the fixed mold are closed, the inner mold groove and the outer convex mold form an appearance cavity, and an extrusion channel is formed between the upper end of the inner mold groove and the extrusion cavity. The appearance cavity is used to form the outer shape of the side plate of the logistics box. The extrusion plug can move in the extrusion channel. When the extrusion plug is pressed down, it can drive the inner cavity template to insert into the molten plastic in the appearance cavity to form a hollow layer for the molten plastic. The inner cavity template and the appearance cavity form the structural shape of the side plate of the logistics box. A cylinder one is arranged on the support base, and the output end of the cylinder one is connected to the side wall of the movable mold. An injection molding machine is arranged on the top of the support base, and the output end of the barrel of the injection molding machine is communicated with the injection hole. The injection molding machine is used to heat the plastic raw material into a molten plastic with fluidity in the barrel and inject the molten plastic into the appearance cavity through the injection hole. The bottom of the movable mold is slidably connected to the top of the support base. A plurality of L-shaped grooves one are opened on the side wall of the movable mold. A recycling chute one is arranged on the other side wall of the movable mold. A plurality of fixing plates are arranged on the top of the movable mold. A sliding convex strip is connected to the side wall of the fixing plate. A cylinder two is also arranged on the top of the movable mold. The extrusion plug includes a sliding frame. The bottom of the sliding frame is connected to the inner cavity template. The sliding frame is movably sleeved on the fixing plate. A sliding groove one is arranged on the inner side wall of the sliding frame, and the sliding groove one is slidably matched with the sliding convex strip. The output end of the cylinder two is connected to the sliding frame. An inclined pressing plate is connected to the side wall of the sliding frame. The top surface and the bottom surface of the inclined pressing plate are set as parallel inclined plane structures. A plurality of plastic discharging holes are opened in the inclined pressing plate from top to bottom, and the plastic discharging holes are used to discharge the redundant molten plastic in the appearance cavity. A recycling chute two is arranged on the side wall of the fixed mold. When the movable mold and the fixed mold are closed, the recycling chute one and the recycling chute two are combined to form a plastic recycling channel.

2. The injection mold for a high-impact resistant and wear-resistant foldable logistics box according to claim 1, wherein, An inclined plate is arranged on the side wall of the fixed mold. The top of the inclined plate is an inclined plane structure, and the inclination angle of the top of the inclined plate is the same as the inclination angle of the top of the inclined pressing plate. By moving the extrusion plug upward in the extrusion channel, the top of the inclined pressing plate can be aligned with the top of the inclined plate. Above the inclined plate, a pusher plate is arranged. One side wall of the pusher plate is connected with a plurality of sliders and driving blocks. The bottom of the pusher plate is set as an inclined surface structure and is attached to the inclined surface at the top of the inclined plate. The other side wall of the pusher plate is connected with a push-pull rod, and the end of the push-pull rod is connected with a piston. On the upper side wall of the extrusion cavity, a plurality of sliding grooves II and strip holes are opened. The sliders are slidably arranged in the sliding grooves II, and the driving blocks movably penetrate through the strip holes.

3. The injection mold for a high impact-resistant and wear-resistant folding logistics box according to claim 2, characterized in that, On the top of the fixed mold, a cylinder III and an air cylinder are also arranged. The output end of the cylinder III is connected with the driving block. The inner cavity of the air cylinder includes an air storage cavity and an air outlet cavity. The output end of the air storage cavity is communicated with the air outlet cavity. The push-pull rod movably penetrates through the side wall of the air cylinder and extends into the air storage cavity. The piston is slidably matched with the circumferential inner wall of the air storage cavity. Among them, the air outlet cavity is a gradually shrinking slender channel structure. The output end of the air outlet cavity is connected with a spray pipe, and the output end of the spray pipe is arranged above the reuse sliding groove II.

4. The injection mold for a highly impact-resistant and wear-resistant folding logistics box according to claim 3, characterized in that, The bottom of the extrusion cavity is set as an inclined surface structure, and the slope of the inclined surface structure is the same as that of the bottom inclined surface structure of the inclined pressing plate. A plurality of top holes are opened on the inclined surface structure at the bottom of the extrusion cavity. A plurality of L-shaped grooves II communicated with the bottom of the top holes are opened at the lower end of the side wall of the fixed mold. A top material ventilation rod is movably arranged in the top holes, and the bottoms of the plurality of top material ventilation rods are connected through a lifting block. The top of the top material ventilation rod is set as an inclined surface structure, and the slope of the inclined surface structure is the same as that of the inclined surface structure at the bottom of the extrusion cavity. A ventilation groove is opened on the side wall of the top material ventilation rod, and the ventilation groove is communicated with the L-shaped groove II. Among them, the lifting block can perform lifting activities. When the lifting block descends to the lowest position, the top of the top material ventilation rod and the top of the top hole form a flat structure, and the ventilation groove is located in the inner cavity of the top hole, so that a closed state is formed between the inner cavity of the top hole and the extrusion cavity. When the lifting block ascends to the highest position, the top of the top material ventilation rod penetrates through the plastic discharge hole of the inclined pressing plate, and the plastic in the plastic discharge hole is ejected. At the same time, the ventilation groove is located above the top hole, so that a communication state is formed between the inner cavity of the top hole and the extrusion cavity.

5. The injection mold for a highly impact-resistant and wear-resistant folding logistics box according to claim 4, characterized in that, The bottom of the fixed mold is connected with a support plate. Above the support plate, a motor is arranged. A lead screw is rotatably arranged between the top of the support plate and the bottom of the fixed mold. The output end of the motor is connected with a gear I, the bottom of the lead screw is connected with a gear II, the gear I is meshed with the gear II, a moving block is threadedly connected to the lead screw, the moving block is connected to the side wall of the lifting block, and the lifting block is slidably arranged on the lower side wall of the fixed mold.

6. The forming method of an injection mold for a high impact-resistant and wear-resistant folding logistics box according to claim 5, characterized in that, Including the following steps: S1. The first-stage mold closing operation: The moving mold is driven by the cylinder I to slide on a plurality of guide rods, so that the moving mold and the fixed mold form a mold closing state. The inner mold cavity and the outer convex mold form an appearance cavity, and the upper end of the inner mold cavity and the extrusion cavity form an extrusion channel. S2. Injection molding operation: The plastic raw material is heated to a molten state by the barrel of the injection molding machine, and the molten plastic is injected into the appearance cavity through the injection hole until the appearance cavity is filled with the molten plastic. S3. Second-stage mold clamping operation: The cylinder two drives the carriage to move downward along the sliding rib, driving the inner cavity template to insert into the outer cavity, until the inclined pressure plate presses down on the bottom of the extrusion cavity. At this time, the inner cavity template and the outer cavity form the structural shape of the side plate of the logistics box. During the process of the inner cavity template inserting into the outer cavity, the molten plastic in the outer cavity can be extruded. The extruded molten plastic can fully fill the outer punch, and the excess molten plastic is discharged from the plastic discharge hole of the inclined pressure plate. S4. Scrap cleaning operation: After the molten plastic cools and solidifies and before the mold opening operation, first, the lifting block rises, driving multiple ejector vent rods to insert upward from the top holes respectively, passing through the plastic discharge holes of the inclined pressure plate to eject the solidified plastic in the plastic discharge holes until the lifting block rises to the highest position and stops. At this time, one end of the vent groove on the side wall of the ejector vent rod communicates with the L-shaped groove two, and the other end is located in the plastic discharge hole of the inclined pressure plate above the top hole, preventing the scrap on the top of the inclined pressure plate from entering the vent groove. Then, the carriage rises to separate the vent groove from the plastic discharge hole, and the inner cavity of the top hole is in communication with the extrusion cavity through the vent groove, preventing a negative pressure from forming in the mold cavity and making it difficult for the carriage to rise. Until the top of the inclined pressure plate is aligned with the top of the inclined plate and the carriage stops moving. At this time, the plastic scrap remains on the top of the inclined pressure plate, and the plastic scrap is pushed out by the push plate for collection and reuse. After the scrap cleaning is completed, the moving mold and the fixed mold are opened to take out the product.

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