Mould pressing tray mould structure

Abstract

The utility model belongs to the technical field of tray production, and particularly discloses a mould pressing tray mould structure which comprises a downward pressing driving device, an upper mould and a lower mould, a tray cavity is formed in the lower mould, an extrusion hole used for extruding a supporting leg is formed in the tray cavity in a downward penetrating mode, and a jacking assembly is arranged on the lower side of the lower mould. The jacking assembly comprises a first jacking device and an extrusion cone, the upper end of the first jacking device is connected to the extrusion cone, and the extrusion cone moves upwards into the extrusion hole through the first jacking device and goes deep into the extruded product, so that the supporting leg is extruded in different directions for many times in the forming process, and due to the reduction of the action area, the product quality is improved. The pressure intensity of the supporting leg part is greatly improved, the extrusion effect is better, through the structure, under the same pressure and temperature, the density of the lower portion of the supporting leg is increased, the strength is enhanced, the probability of hole cracks is greatly reduced, the transmission influence of layer-by-layer force is reduced through force in different directions, and the tonnage of the press can also be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of pallet production, in particular to a mold structure for a molded pallet. Background Art

[0002] Plant fiber molded flat industrial pallets are made of wood shavings, plant straw, and rice husks, mixed with glue and pressed together through a mold. The pallet, consisting of a deck and nine support legs, has a flat upper surface with reinforced ribs to hold cargo, while the nine support legs on the lower surface are distributed to accommodate forklifts in all directions. Molded pallets are an environmentally friendly and economical means of transportation, widely used in manufacturing, warehousing, and other fields. In the molded wood and rice husk pallet industries, the quality, efficiency, and cost of the finished product are closely linked to the molds used. After the raw materials are mixed with glue, they are placed in the mold, where they are then pressurized and heated to form the product. The strength of the support legs (usually nine) determines the product's load-bearing capacity. Therefore, the support legs are of particular concern, and their design has been modified through various technical analyses, including the addition of steps to enhance their strength. The mold is typically divided into an upper and lower mold based on the product's design dimensions, and upon closing, the designed shape is formed.

[0003] Currently, the approach to improving the strength of product support legs is mostly to improve the product shape. However, the performance of the product determines that the cavity of the support legs is deep, and the side forming force is inconsistent with the force of the press. Therefore, the strength of the support legs has always been a problem in the production of molded pallets. In the original upper and lower mold structures, the support leg forming requires the upper mold pressure to be transmitted layer by layer through the wood chips during the extrusion process, and the side force is converted from the vertical force to forces in different directions through the bevel of the upper mold. During the force transmission process, the material is also carried along and flowed, resulting in cracks and cavitations. Unbalanced flow or pressure decreasing layer by layer can easily lead to uneven strength. Utility Model Content

[0004] In view of the problems of cracks and cavitations easily occurring in molded support legs and uneven strength in the prior art, a molded tray mold structure is proposed. This utility model provides the following technical solutions:

[0005] A mold structure for a molded pallet includes a downward pressing drive device, an upper mold, and a lower mold. The lower end of the downward pressing drive device is connected to the upper mold and drives the upper mold to press the lower mold. The lower mold is provided with a tray cavity, and an extrusion hole for extruding a support leg is provided downwardly through the tray cavity. The lower side of the lower mold is provided with a pressing component for extruding the support leg upward.

[0006] The pressing assembly includes a first lifting device and an extrusion cone for pressing the support foot. The upper end of the first lifting device is connected to the extrusion cone, and the extrusion cone moves upward to the extrusion hole through the first lifting device.

[0007] Preferably, the pressing assembly further comprises an auxiliary pressing member, the auxiliary pressing member comprises a bottom plate and a vertical cylinder, a guide hole is provided through the vertical cylinder and the bottom plate, and the extrusion cone passes through the guide hole.

[0008] Preferably, the extrusion cone is slidably connected to the guide hole.

[0009] Preferably, the outer diameter of the vertical plate is smaller than the outer diameter of the extrusion hole.

[0010] Preferably, the jacking assembly further includes a second jacking device for jacking the auxiliary jacking member, and the upper end of the second jacking device is connected to the base plate.

[0011] Preferably, the first lifting device and the second lifting device are driven by hydraulic cylinders.

[0012] Preferably, the upper portion of the extrusion hole is a tapered hole that is larger at the top and smaller at the bottom.

[0013] Preferably, the tray cavity is provided with rib grooves for enhancing the strength of the tray.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Through secondary and tertiary extrusion forming of the support legs, the strength of the product is improved under the same conditions;

[0016] 2. Through multi-directional extrusion, the force transmission path is shortened and the efficiency is higher;

[0017] 3. The original mold can be updated and the tonnage of the press can be reduced to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the state when pressing begins;

[0020] Figure 3 It is a schematic diagram of the state of the extrusion cone top pressure;

[0021] Figure 4 This is a schematic diagram of the state of the auxiliary ejector ejecting the product;

[0022] In the accompanying drawings, 1. downward pressure driving device; 2. upper mold; 3. lower mold; 31. extrusion hole; 32. rib groove; 4. top pressure assembly; 41. extrusion cone; 42. first jacking device; 43. auxiliary top pressure member; 431. bottom plate; 432. vertical cylinder; 4321. guide hole; 44. second jacking device; 5. material; 6. product. DETAILED DESCRIPTION

[0023] The directional terms mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only used with reference to the directions of the drawings. Therefore, the directional terms used are used to illustrate rather than limit the invention of the utility model.

[0024] like Figure 1-4 As shown, a mold structure for a molded pallet includes a downward pressing drive device 1, an upper mold 2, and a lower mold 3. The lower end of the downward pressing drive device 1 is connected to the upper mold 2 and drives the upper mold 2 to press the lower mold 3 to quickly form the pallet. The lower mold 3 is provided with a pallet cavity, and an extrusion hole 31 is provided downwardly through the pallet cavity for extruding the support legs. The lower side of the lower mold 3 is provided with a pressing component 4 for extruding the support legs upward.

[0025] The pressing assembly 4 includes a first lifting device 42 and an extrusion cone 41. The support foot is used to press the pallet. The upper end of the first lifting device 42 is connected to the extrusion cone 41. The extrusion cone 41 moves upward to the extrusion hole 31 through the first lifting device 42 and penetrates into the interior of the extruded product 6, so that the support foot is extruded in different directions many times during the forming process. Due to the reduction in the effective area, the pressure of the support foot is greatly improved, and the extrusion effect is better. Through this structure, under the same pressure and temperature, the density of the lower part of the support foot is increased, the strength is strengthened, and the probability of void cracks is greatly reduced. The forces in different directions reduce the influence of the force transmission layer by layer, and the tonnage of the press can also be reduced.

[0026] Furthermore, the top pressure assembly 4 also includes a secondary top pressure piece 43, and the secondary top pressure piece 43 includes a base plate 431 and a vertical cylinder 432. A guide hole 4321 is provided through the vertical cylinder 432 and the base plate 431. The extrusion cone 41 is slidably connected to the guide hole 4321, which reduces friction and resistance, makes the movement of the extrusion cone 41 smoother and more stable, improves the overall performance and efficiency of the mold structure, and improves the anti-leakage effect of the material 5.

[0027] Furthermore, the jacking assembly 4 also includes a second jacking device 44 for jacking the auxiliary jacking member 43, and the upper end of the second jacking device 44 is connected to the base plate 431; the specific vertical cylinder 432 is cylindrical, and the outer diameter of the vertical cylinder 432 is smaller than the outer diameter of the extrusion hole 31, and the vertical cylinder 432 can extend upward from the extrusion hole 31, ensuring that the extrusion cone 41 will not be overly restricted by the extrusion hole 31 when moving upward, thereby ensuring the precise forming of the pallet support foot.

[0028] Furthermore, the first lifting device and the second lifting device adopt hydraulic cylinders, which have simple structure, reliable operation and large output force.

[0029] Furthermore, the upper part of the extrusion hole 31 is a tapered hole that is larger at the top and smaller at the bottom, and the lower part has a straight hole structure that cooperates with the vertical cylinder 432, so that the support foot can gradually receive uniform extrusion force during the forming process, thereby ensuring the strength and stability of the pallet support foot.

[0030] Furthermore, the tray cavity is provided with rib grooves 32 for enhancing the strength of the tray, thereby ensuring the strength of the tray.

[0031] Working process: After the upper mold 2 and the lower mold 3 are heated normally and the material 5 is laid normally, the upper mold 2 compacts and shapes the material 5 under the action of the oil jack, and the first extrusion of the support foot is completed at this time; then the extrusion cone 41 squeezes the support foot upward for the second time under the action of the first jacking device 42; after it is in place, under the action of the second jacking device 44, the vertical cylinder 432 squeezes the support foot upward for the third time; then the insulation operation is carried out; when the time is up, the upper mold is depressurized and rises; the extrusion cone 41 can be lowered and withdrawn at the same time; then, the bottom plate 431 continues to rise to push the formed product 6 out of the lower mold 3, completing the production process of one product 6.

Claims

1. A mold structure for a molded tray, comprising a downward pressing drive device (1), an upper mold (2) and a lower mold (3), wherein the lower end of the downward pressing drive device (1) is connected to the upper mold (2) and drives the upper mold (2) to press the lower mold (3), and the lower mold (3) is provided with a tray cavity, characterized in that: An extrusion hole (31) for extruding the support leg is provided downwardly through the tray cavity, and a pressing assembly (4) for extruding the support leg upward is provided on the lower side of the lower mold (3); The pressing assembly (4) comprises a first lifting device (42) and an extrusion cone (41) for pressing the support foot. The upper end of the first lifting device (42) is connected to the extrusion cone (41), and the extrusion cone (41) can be moved upward into the extrusion hole (31) through the first lifting device (42).

2. The mold structure of the molded pallet according to claim 1, characterized in that: The pressing assembly (4) further comprises a secondary pressing member (43), the secondary pressing member (43) comprising a bottom plate (431) and a vertical cylinder (432), a guide hole (4321) being provided through the vertical cylinder (432) and the bottom plate (431), and the extrusion cone (41) is operable to pass through the guide hole (4321).

3. The mold structure of the molded pallet according to claim 2, characterized in that: The extrusion cone (41) is slidably connected to the guide hole (4321).

4. The mold structure of the molded pallet according to claim 2, characterized in that: The outer diameter of the vertical cylinder (432) is smaller than the outer diameter of the extrusion hole (31).

5. The mold structure of the molded pallet according to claim 2, characterized in that: The jacking assembly (4) further comprises a second jacking device (44) for jacking the auxiliary jacking member (43), wherein the upper end of the second jacking device (44) is connected to the bottom plate (431).

6. The mold structure of the molded pallet according to claim 5, characterized in that: The first lifting device and the second lifting device adopt hydraulic cylinders.

7. The mold structure of the molded pallet according to claim 1, characterized in that: The upper portion of the extrusion hole (31) is a tapered hole that is larger at the top and smaller at the bottom.

8. The mold structure of the molded pallet according to claim 1, characterized in that: A rib groove (32) is provided in the tray cavity for enhancing the strength of the tray.

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