Multi-cavity mold for supercritical foaming

Abstract

The utility model provides a multi-cavity mould for supercritical foaming, which comprises an upper mould and a lower mould, four or more cavities are arranged between the lower mould and the upper mould, a main runner and sub-runners are arranged between the upper mould and / or the lower mould, the number of the sub-runners corresponds to that of the cavities, and the number of the sub-runners corresponds to that of the cavities. Two ends of each sub-runner are respectively connected with the main runner and the corresponding cavity, one end, far away from the injection port, of the main runner is provided with a backflow channel, and the joint of each sub-runner and the main runner is positioned on the side wall of the main runner between the injection port and the backflow channel. The four or more cavities used for shoe blank forming are arranged, four or more shoe blanks can be formed at a time, the effective efficiency is remarkably improved, the backflow channel is arranged at the tail end of the main runner, redundant air can be squeezed to the backflow channel when raw materials are injected into the main runner, air in the main runner is prevented from entering the cavities as much as possible, and the service life of the shoe blanks is prolonged. The forming quality of the shoe blank is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of shoemaking, in particular to a multi-cavity mould for supercritical foaming. Background Art

[0002] The sole is the bottom part of the shoe, and its production also requires multiple steps. Currently, there is a process for molding soles using supercritical foaming technology, which is a physical foaming molding technology. In the injection molding, extrusion and blow molding processes, supercritical carbon dioxide or nitrogen or other gases are first injected into a special plasticizing device to allow the gas to be fully and evenly mixed / diffused with the molten raw materials to form a single-phase mixed sol. The sol is then introduced into the mold cavity to finally form the shoe blank, which is then sent to the reactor for foaming. However, the existing supercritical foaming traditional shoe blank mold has only two molding cavities in the mold. Therefore, only one pair of shoe blanks can be molded at a time during shoe blank molding, which greatly limits the molding efficiency of the shoe blank. In addition, the air in the flow channel cannot be properly eliminated and handled, and the container causes defects in the shoe blank after molding in the mold cavity. Utility Model Content

[0003] In order to solve the above problems, the purpose of the present invention is to provide a multi-cavity mold for supercritical foaming.

[0004] The utility model is achieved by the following method: a multi-cavity mold for supercritical foaming, comprising an upper mold and a lower mold, four or more cavities are provided between the lower mold and the upper mold, a main channel and a branch channel are provided between the upper mold and / or the lower mold, the number of the branch channels corresponds to the number of the cavities, the two ends of each branch channel are respectively connected to the main channel and the corresponding cavity, a return channel is provided at the end of the main channel away from the injection port, and the connection between the branch channel and the main channel is located on the side wall of the main channel between the injection port and the return channel.

[0005] Preferably, a blocking member capable of being inserted into and blocking the current branch channel is connected to the side wall of each branch channel.

[0006] Preferably, a threaded hole is provided on the side wall of the diverter channel, the blocking member is a bolt, and the blocking bolt is inserted into the threaded hole.

[0007] Preferably, one end of the cavity away from the runner is connected to a vent hole, and the vent hole is provided in the upper mold and / or the lower mold.

[0008] Preferably, the size of the branch channel gradually increases from being away from the cavity to being connected with the cavity.

[0009] Preferably, one end of the branch channel away from the main channel is connected to the heel end of the cavity.

[0010] Preferably, each of the mold cavities is surrounded by a concave mold provided in the lower mold and a convex mold provided in the upper mold; a plurality of columns are arranged on the lower surface of the convex mold.

[0011] Preferably, a positioning convex portion or a positioning concave portion is provided on the lower surface of the upper mold at a position avoiding the cavity, and a positioning concave portion or a positioning convex portion is provided on the upper surface of the lower mold at a position avoiding the cavity, and the positioning convex portion and the positioning concave portion cooperate with each other.

[0012] Preferably, the four corners of the upper mold and the lower mold are provided with the positioning protrusions or the positioning recesses, the positioning recesses and the positioning protrusions located at the four corners are provided with locking holes, and locking bolts are passed through the locking holes of the upper mold and the lower mold.

[0013] Preferably, there are four cavities, and two adjacent cavities are symmetrical to each other; and two adjacent branch channels are symmetrical to each other.

[0014] The beneficial effects of the present invention are as follows: the present invention provides a multi-cavity mold for supercritical foaming. Compared with the prior art, the present invention has at least the following technical effects: 1. The number of cavities for shoe blank molding is set to four or more, so that four or more shoe blanks can be molded at a time, significantly improving the efficiency. In addition, a return channel is provided at the end of the main channel. When the raw material is injected into the main channel, the excess air is squeezed into the return channel to prevent the air in the main channel from entering the mold cavity as much as possible, thereby ensuring the molding quality of the shoe blank. 2. An insertable blocking member is provided on each branch channel. When the shoe blank in a certain cavity is not molded well, the blocking member can be inserted in time to cut off the branch channel connecting to the cavity to prevent the excess raw material from being injected into the cavity, thereby saving raw material. 3. An exhaust hole is provided at the end of the cavity away from the branch channel. When the raw material is injected into the cavity for molding, the gas in the cavity and the branch channel is discharged from the exhaust hole, thereby ensuring the molding quality of the shoe blank and preventing the formation of bubbles in the shoe blank. 4. Enlarging the size of the connection between the runner and the cavity strengthens the connection and support with the shoe base during demolding, facilitating stable demolding. 5. A vertical column is provided on the lower surface of the punch. This creates a hole in the shoe base after the material injected into the cavity solidifies, facilitating foaming in subsequent processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the discrete components of a multi-cavity mold for supercritical foaming according to the present invention.

[0016] Figure 2 It is a three-dimensional structural schematic diagram of a multi-cavity mold for supercritical foaming of the present invention.

[0017] Figure 3It is a structural schematic diagram of the lower mold of the present utility model.

[0018] Figure 4 It is a structural schematic diagram of the upper mold of the present utility model.

[0019] Figure 5 It is a cross-sectional view of a multi-cavity mold for supercritical foaming according to the present invention.

[0020] Figure 6 Figure a in the middle is a schematic diagram of the state in which the blocking member blocks the diversion channel.

[0021] Figure 6 Figure b is a schematic diagram of the state where the blocking member is blocking the diversion channel.

[0022] Explanation of the accompanying figures: 1. Upper mold; 11. Punch; 12. Post; 13. Positioning protrusion; 2. Lower mold; 21. Die; 22. Positioning recess; 3. Main flow channel; 4. Branch flow channel; 5. Return flow channel; 6. Blocking piece; 7. Exhaust hole; 8. Locking bolt. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] See also Figures 1 to 6 A multi-cavity mold for supercritical foaming comprises an upper mold 1 and a lower mold 2, wherein four or more cavities are provided between the lower mold 2 and the upper mold 1, and a main channel 3 and a branch channel 4 are provided between the upper mold 1 and / or the lower mold 2. The number of the branch channels 4 corresponds to the number of the cavities, and the two ends of each branch channel 4 respectively connect the main channel 3 and the corresponding cavity. A return channel 5 is provided at the end of the main channel 3 away from the injection port, and the connection between the branch channel 4 and the main channel 3 is located on the side wall of the main channel 3 between the injection port and the return channel 5. By setting the number of cavities for shoe blank molding to four or more, four or more shoe blanks can be molded at a time, which significantly improves the molding efficiency. In addition, a return channel 5 is provided at the end of the main channel 3. When the raw material is injected into the main channel 3, the excess air will be squeezed into the return channel 5 to prevent the air in the main channel 3 from entering the cavity as much as possible, thereby ensuring the molding quality of the shoe blank.

[0025] See also Figure 1 、 Figure 2 、 Figures 4 to 6 Preferably, a blocking member 6 is connected to the side wall of each diversion channel 4 and can be inserted to block the current diversion channel 4. Each diversion channel is provided with an insertable blocking member 6. When the shoe blank in a certain cavity is not well formed, the blocking member 6 can be inserted in time to cut off the diversion channel 4 connected to the cavity, thereby preventing excess raw material from being injected into the cavity, thereby saving raw material.

[0026] See also Figure 1 、 Figure 2 、 Figures 4 to 6 Preferably, a threaded hole is provided on the side wall of the diverter 4, and the blocking member 6 is a bolt, and the blocking bolt is inserted into the threaded hole. The blocking bolt is screwed in to completely block the diverter 4 with the bolt.

[0027] See also Figures 1 to 5 Preferably, the end of the cavity away from the runner 4 is connected to a vent 7, and the vent 7 is provided in the upper mold 1 and / or the lower mold 2. The vent 7 is provided at the end of the cavity away from the runner 4 to facilitate the discharge of gas in the cavity and the runner 4 from the vent 7 when the raw material is injected into the cavity for molding, thereby ensuring the molding quality of the shoe blank and avoiding the formation of bubbles in the shoe blank.

[0028] See also Figures 1 to 5 Preferably, the size of the diverter channel 4 gradually increases from the point away from the mold cavity to the point where it connects with the mold cavity, thereby increasing the connection area with the shoe base. The end of the diverter channel 4 away from the main channel 3 is connected to the heel end of the mold cavity. Increasing the size of the diverter channel 4 at the point where it connects with the mold cavity can strengthen the connection and support with the shoe base during demolding, facilitating stable demolding.

[0029] See also Figures 1 to 5 Preferably, each cavity is formed by a female mold 21 in the lower mold 2 and a male mold 11 in the upper mold 1; the lower surface of the male mold 11 is provided with multiple pillars 12. The presence of pillars 12 on the lower surface of the male mold 11 allows for the formation of pores in the shoe base after the raw material injected into the cavity solidifies, facilitating subsequent foaming processes. Preferably, the female mold 21 and the male mold 11 are arranged in a lower, upper structure to facilitate demolding of the shoe base after solidification.

[0030] See also Figures 1 to 6 Preferably, a positioning convex portion 13 or a positioning concave portion 22 is provided on the lower surface of the upper mold 1 at a position away from the mold cavity, and a positioning concave portion 22 or a positioning convex portion 13 is provided on the upper surface of the lower mold 2 at a position away from the mold cavity, and the positioning convex portion 13 and the positioning concave portion 22 cooperate with each other. This facilitates the positioning connection between the upper mold 1 and the lower mold 2, ensuring that the male mold 11 and the female mold 21 can be accurately aligned.

[0031] See also Figures 1 to 6 Preferably, the four corners of the upper mold 1 and the lower mold 2 are provided with the positioning protrusions 13 or the positioning recesses 22. The positioning recesses 22 and the positioning protrusions 13 at the four corners are provided with locking holes, and locking bolts 8 are passed through the locking holes of the upper mold 1 and the lower mold 2. This facilitates locking and fixing the upper mold 1 and the lower mold 2 together.

[0032] See also Figures 1 to 5 Preferably, there are four cavities, and two adjacent cavities are symmetrical to each other; two adjacent diversion channels 4 are symmetrical to each other. The whole is butterfly-shaped, and the lengths of the diversion channels 4 are the same to ensure that the shoe bases in all cavities are formed synchronously.

[0033] The utility model has the following working principle:

[0034] When injection molding is required, the upper mold 1 and the lower mold 2 are aligned and connected (that is, the positioning protrusion 13 and the positioning recess 22 are aligned); then, the locking bolt 8 is inserted into the locking hole to fasten the upper mold 1 and the lower mold 2 together; then, the raw material is injected from the entrance of the main channel 3 through an injection molding machine and other equipment, and the raw material enters the cavity along the main channel 3 and the branch channel 4 (most of the air in the main channel 3 will be squeezed into the return channel 5 during the entry of the raw material), and the air in the branch channel 4 and the air in the cavity are discharged from the exhaust hole 7 at the end of the cavity away from the branch channel 4. This can effectively avoid the generation of bubbles in the shoe embryo and ensure the molding quality of the shoe embryo. If there is a problem with the shoe embryo molding in a certain cavity during this process, a bolt is directly inserted into the branch channel 4 connected to the cavity to cut off the flow channel to avoid wasting raw materials. After the shoe blanks have solidified, the upper mold 1 and the lower mold 2 are disassembled in reverse, and the four shoe blanks (that is, two pairs of soles) can be taken out as a whole. Since the connection between the diverter channel 4 and the cavity is designed to be larger at the top and smaller at the bottom, the connection strength between the solidified material at the flow channel and the shoe blanks can be enhanced during demolding, avoiding the problem of the connection being disconnected during demolding, which makes it impossible to take out the shoe blanks in one go, and helps to improve production efficiency.

[0035] Several points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which can be mechanical connection or electrical connection, or internal communication between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may change.

[0036] Secondly: The drawings of the disclosed embodiments of the present invention only involve structures related to the disclosed embodiments. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0037] Finally, the above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention fall within the protection scope of the present invention.

[0038] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should also be regarded as within the scope of protection of the present invention.

Claims

1. A multi-cavity mold for supercritical foaming, comprising an upper mold and a lower mold, characterized in that: Four or more cavities are provided between the lower mold and the upper mold, and a main channel and a branch channel are provided between the upper mold and / or the lower mold. The number of the branch channels corresponds to the number of the cavities, and the two ends of each branch channel are respectively connected to the main channel and the corresponding cavity. A return channel is provided at the end of the main channel away from the injection port, and the connection between the branch channel and the main channel is located on the side wall of the main channel between the injection port and the return channel.

2. The multi-cavity mold for supercritical foaming according to claim 1, characterized in that: A blocking member capable of being inserted into and blocking the current branch channel is connected to the side wall of each branch channel.

3. The multi-cavity mold for supercritical foaming according to claim 2, characterized in that: A threaded hole is provided on the side wall of the diverter channel, and the blocking member is a bolt, which is passed through the threaded hole.

4. The multi-cavity mold for supercritical foaming according to claim 1, characterized in that: One end of the cavity away from the runner is connected to a vent hole, and the vent hole is provided in the upper mold and / or the lower mold.

5. The multi-cavity mold for supercritical foaming according to claim 4, characterized in that: The size of the branch channel gradually increases from being away from the cavity to being connected with the cavity.

6. The multi-cavity mold for supercritical foaming according to claim 5, characterized in that: One end of the branch channel away from the main channel is communicated with the heel end of the cavity.

7. The multi-cavity mold for supercritical foaming according to claim 1, characterized in that: Each of the mold cavities is surrounded by a concave mold arranged in the lower mold and a convex mold arranged in the upper mold; a plurality of columns are arranged on the lower surface of the convex mold.

8. The multi-cavity mold for supercritical foaming according to claim 1, characterized in that: A positioning convex portion or a positioning concave portion is provided on the lower surface of the upper mold at a position avoiding the mold cavity, and a positioning concave portion or a positioning convex portion is provided on the upper surface of the lower mold at a position avoiding the mold cavity, and the positioning convex portion and the positioning concave portion cooperate with each other.

9. The multi-cavity mold for supercritical foaming according to claim 8, characterized in that: The four corners of the upper mold and the lower mold are provided with the positioning protrusions or the positioning recesses, the positioning recesses and the positioning protrusions at the four corners are provided with locking holes, and locking bolts are passed through the locking holes of the upper mold and the lower mold.

10. The multi-cavity mold for supercritical foaming according to claim 1, characterized in that: There are four cavities, and two adjacent cavities are symmetrical to each other; and two adjacent branch channels are symmetrical to each other.

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