Forming mold sealing device for packaging box injection molding production

Abstract

The invention relates to the technical field of mechanical production, and discloses a forming mold sealing device for packaging box injection molding production, which comprises an injection pipe, a sliding mechanism for dislocation separation of packaging boxes is arranged at the bottom of a fixed mold, and a clamping mechanism for sealing an injection molding material and preventing leakage is arranged at the joint of the fixed mold and a movable mold. The top of the fixed mold and the bottom of the movable mold are provided with supporting mechanisms used for fixing the fixed mold and the movable mold, and the packaging box cannot be attached to the surface of the bottom of the sliding mold in the dislocation movement process of the sliding mold, so that the situation that materials of the packaging box and an injection pipe are connected due to cooling is prevented; the phenomenon that the packing box is incomplete or redundant in the separation process is avoided, meanwhile, the problem that after the packing box is cooled and formed, the packing box cannot be demolded along with separation of the movable mold and the fixed mold is solved, and the phenomena that injection molding of the packing box fails and the movable mold cannot conduct follow-up packing box forming work again are further prevented. And the probability of defective products of the packaging box is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical production, in particular to a molding die closing device used for injection molding production of packaging boxes. Background Art

[0002] The mold is a tool used to make rapid prototyping items, including packaging boxes, plastic shells, etc. For the injection molding of packaging boxes, the shape of the item is mainly processed by changing the physical state of the molding material, so that the blank becomes a packaging box with a specific shape and size. The mold generally consists of two parts: a movable mold and a fixed mold. The two parts can be separated or combined, and the movable mold and the fixed mold are often parallel when combined. However, during long-term use, due to mechanical fatigue of the device, slight misalignment may occur during the movement of the movable mold, which will lead to the inability to fully fit between the movable mold and the fixed mold, resulting in a gap between the movable mold and the fixed mold. This will cause the material to flow out from the gap between the movable mold and the fixed mold during the forming process of the blank, causing This ultimately leads to the failure of the packaging box to be formed. In addition, since the movable mold and the fixed mold are not in a flush state when they are parallel to each other, the formed cavity is misaligned, which makes the packaging boxes of different sizes and there is excess injection molding, which increases production costs and reduces the yield of the packaging boxes. After the packaging box is cooled and formed, the material at the feed port will be cooled synchronously with the packaging box body formed in the mold cavity. When the movable mold and the fixed mold are separated, the packaging box formed in the mold cavity is connected with the excess material at the feed port, which will cause the packaging box to follow the feed port and attach to the fixed mold, making it impossible to effectively demold. At the same time, during the demolding process, the movement of the movable mold will cause the feed port to take away part of the material, causing the excess material attached to the bottom of the packaging box body to make the packaging box body dented and defective.

[0003] In order to solve the above problems, the inventors proposed a molding mold closing device for the injection molding production of packaging boxes, which has the advantages of tight fit and easy separation. Summary of the Invention

[0004] In order to solve the above technical problems, a molding mold closing device for injection molding production of packaging boxes is provided. This technical solution solves the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention can be implemented by adopting the following technical solutions: a molding mold closing device for injection molding production of packaging boxes, comprising an injection tube, a fixed mold fixedly installed at the bottom of the injection tube, a movable mold arranged below the fixed mold, a sliding mechanism for dislocation and separation of packaging boxes arranged at the bottom of the fixed mold, a clamping mechanism for sealing the injection molding material to prevent leakage arranged at the connection between the fixed mold and the movable mold, a supporting mechanism for fixing the fixed mold arranged at the top of the fixed mold, and a supporting mechanism for fixing the movable mold arranged at the bottom of the movable mold.

[0006] Furthermore, the support mechanism includes a top plate, a first slide, a second slide, a baffle, a first support column, and a first fastening plate. The top plate is fixedly connected to the upper end of the outer wall of the injection tube, the first slide and the second slide are both slidably connected to the bottom of the top plate, the baffle is fixedly installed on the bottom of the first slide and the second slide, there are four first support columns, and the four first support columns are respectively fixedly connected to the four corners of the bottom of the baffle, the first fastening plates are all fixedly connected to the lower end of the first support column, and the first fastening plate is fixedly connected to the top of the fixed mold by bolts.

[0007] Furthermore, the sliding mechanism includes a first sliding mold, a second sliding mold, a first side plate, a second side plate, a fixed plate, and a spring. The first sliding mold and the second sliding mold are both fixedly connected to the bottom of the fixed mold. There are two groups of springs, each group of springs is provided with three springs, and the two groups of springs are respectively fixedly connected to the inner sides of the first sliding mold and the second sliding mold. The first side plate is fixedly connected to the side of the spring away from the first sliding mold, and the second side plate is fixedly connected to the side of the spring away from the second sliding mold. The fixed plate is fixedly connected between the first side plate and the second side plate, and the fixed plate is fixedly connected to the bottom of the injection tube.

[0008] Furthermore, the sliding mechanism also includes a first fixed column and a second fixed column, the first fixed column is fixedly connected to the top of the first sliding mold, the first slide plate is fixedly connected to the top of the first fixed column, the second fixed column is fixedly connected to the top of the second sliding mold, and the second slide plate is fixedly connected to the top of the second fixed column.

[0009] Furthermore, the clamping mechanism includes a first bevel column and a second bevel column, the first bevel column and the second bevel column are respectively fixedly connected to both sides of the movable mold, the upper end of the first bevel column is slidably connected to the bottom of the first sliding mold, and the upper end of the second bevel column is slidably connected to the bottom of the second sliding mold.

[0010] Furthermore, the clamping mechanism also includes a third beveled column, a first beveled slot, a fourth beveled column, a second beveled slot, a clamping column, a first clamping slot, a clamping plate, and a second clamping slot. The third beveled column and the fourth beveled column are respectively fixedly connected to both sides of the fixed mold, the first beveled slot and the second beveled slot are opened on both sides of the movable mold, the third beveled column and the first beveled slot are clamped to each other, the fourth beveled column and the second beveled slot are clamped to each other, the clamping column is fixedly connected to both sides of the first beveled column and the second beveled column, the first clamping slot is opened on the inner side of the third beveled column and the fourth beveled column, the clamping column and the first clamping slot are clamped to each other, the clamping plate is fixedly connected to the bottom of the third beveled column and the fourth beveled column, the second clamping slot is opened at the bottom of the movable mold, and the clamping plate and the first clamping slot are clamped to each other.

[0011] Furthermore, the support mechanism also includes a second support column, a second fastening plate, and a bottom plate. The second support column is fixedly connected to the bottom of the movable mold, the second fastening plate is fixedly connected to the lower end of the second support column, and the bottom plate is fixedly connected to the bottom of the second fastening plate by bolts.

[0012] Furthermore, a first ejector pin and a second ejector pin are provided on the upper surface of the bottom plate. The first ejector pin and the second ejector pin pass through the interior of the movable mold. The tops of the first ejector pin and the second ejector pin are parallel to the bottom upper surface of the movable mold.

[0013] Furthermore, a small hole is provided at the bottom of the injection tube, and the small hole at the bottom of the injection tube is communicated with the interiors of both the fixed mold and the movable mold.

[0014] Beneficial effects

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. During the dislocation movement of the sliding mold, the packaging box cannot adhere to the bottom surface of the sliding mold, and the packaging box will also be disconnected from the bottom of the injection tube, ensuring that the bottom of the packaging box is flat and smooth. Finally, the packaging box will leave the fixed mold along with the movable mold, so that the packaging box, the fixed mold and the injection tube are completely separated, preventing the packaging box and the injection tube from being connected due to cooling. This avoids the phenomenon of incomplete or excess residual materials when the packaging box is separated. At the same time, it avoids the problem that the packaging box cannot be demoulded as the movable mold and the fixed mold are separated after the packaging box is cooled and formed. This further prevents the packaging box from failing in injection molding and the movable mold from being unable to perform subsequent packaging box molding work, thereby improving the production efficiency of the mold and reducing the probability of defective packaging boxes.

[0017] 2. The connection between the sliding mold and the bevel column can effectively make the fixed mold and the movable mold completely merged, avoiding the phenomenon of different sizes of the packaging box caused by looseness of the fixed mold and the movable mold. At the same time, the mutual engagement of the clamping column and the first clamping groove can effectively fix the clamping position of the bevel column, avoiding the misalignment of the bevel column and the sliding mold, which causes the injection cavity to change, prevents the packaging box from being deformed during the injection of the material, and prevents the problem of injection material leakage during the injection;

[0018] 3. The fixed mold and the movable mold are closely connected by the mechanism, which increases the tightness of the fixed mold and the movable mold, avoids the dislocation of the movable mold during the movement of the movable mold due to mechanical fatigue of the device, and prevents the generation of a gap when the movable mold and the fixed mold are closed, thereby avoiding the injection material from flowing out of the gap between the movable mold and the fixed mold during the blank forming process, resulting in burrs on the injection molding of the packaging box. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic sectional perspective view of the overall structure of the present invention;

[0021] Figure 3 For the present invention Figure 2 A schematic diagram of the structure at center A;

[0022] Figure 4 This is a schematic diagram of the position and connection relationship of the top plate, slide plate, support column and fixed column of the present invention;

[0023] Figure 5 This is a schematic internal perspective view of the positional relationship between the injection tube, slide mold, and spring of the present invention;

[0024] Figure 6 Schematic diagram of the positional relationship between the sliding mold and the bevel column and the mold cavity structure of the present invention;

[0025] Figure 7 Schematic diagram of the movable mold structure of the present invention;

[0026] Figure 8 This is a schematic diagram of the fixed mold structure of the present invention;

[0027] Figure 9 This is a sectional perspective diagram of the connection between the movable mold, the fixed mold and the base of the present invention;

[0028] Figure 10 This is a top-down, sectional, and stereoscopic diagram of the connection between the movable mold and the fixed mold of the present invention;

[0029] Figure 11 It is a three-dimensional schematic diagram of the movable mold base structure of the present invention.

[0030] Reference numerals: 1, injection tube; 2, fixed mold; 3, movable mold;

[0031] Sliding mechanism: 4, first sliding mold; 5, second sliding mold; 6, first side plate; 7, second side plate; 8, fixed plate; 19, spring; 21, first sliding plate; 22, second sliding plate; 26, first fixed column; 27, second fixed column;

[0032] Clamping mechanism: 9, first beveled column; 10, second beveled column; 11, third beveled column; 12, first oblique slot; 13, fourth beveled column; 14, second oblique slot; 15, clamping column; 16, first clamping slot; 17, clamping plate; 18, second clamping slot;

[0033] Support mechanism: 20, top plate; 23, baffle; 24, first support column; 25, first fastening plate; 28, second support column; 29, second fastening plate; 30, bottom plate; 31, first ejector pin; 32, second ejector pin. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0036] like Figures 1 to 11 As shown in the figure, a molding mold closing device for injection molding production of packaging boxes of the present invention comprises an injection tube 1, a fixed mold 2 is fixedly installed at the bottom of the injection tube 1, a movable mold 3 is arranged below the fixed mold 2, a sliding mechanism for dislocation and separation of packaging boxes is arranged at the bottom of the fixed mold 2, a clamping mechanism for sealing the injection molding material to prevent leakage is arranged at the connection between the fixed mold 2 and the movable mold 3, a supporting mechanism for fixing the fixed mold 2 is arranged at the top of the fixed mold 2, and a supporting mechanism for fixing the movable mold 3 is arranged at the bottom of the movable mold 3.

[0037] The supporting mechanism includes a top plate 20, a first slide 21, a second slide 22, a baffle 23, a first support column 24, and a first fastening plate 25. The top plate 20 is fixedly connected to the upper end of the outer wall of the injection tube 1, the first slide 21 and the second slide 22 are both slidably connected to the bottom of the top plate 20, the baffle 23 is fixedly installed on the bottom of the first slide 21 and the second slide 22, there are four first support columns 24, and the four first support columns 24 are respectively fixedly connected to the four corners of the bottom of the baffle 23, the first fastening plates 25 are all fixedly connected to the lower ends of the first support columns 24, and the first fastening plate 25 is fixedly connected to the top of the fixed mold 2 by bolts.

[0038] The sliding mechanism includes a first sliding mold 4, a second sliding mold 5, a first side plate 6, a second side plate 7, a fixed plate 8, and a spring 19. The first sliding mold 4 and the second sliding mold 5 are both fixedly connected to the bottom of the fixed mold 2. There are two groups of springs 19, and each group of two groups of springs 19 is provided with three. The two groups of springs 19 are respectively fixedly connected to the inner sides of the first sliding mold 4 and the second sliding mold 5. The first side plate 6 is fixedly connected to the side of the spring 19 away from the first sliding mold 4, the second side plate 7 is fixedly connected to the side of the spring 19 away from the second sliding mold 5, the fixed plate 8 is fixedly connected between the first side plate 6 and the second side plate 7, and the fixed plate 8 is fixedly connected to the bottom of the injection tube 1.

[0039] The sliding mechanism also includes a first fixed column 26 and a second fixed column 27. The first fixed column 26 is fixedly connected to the top of the first sliding mold 4, the first slide 21 is fixedly connected to the top of the first fixed column 26, the second fixed column 27 is fixedly connected to the top of the second sliding mold 5, and the second slide 22 is fixedly connected to the top of the second fixed column 27.

[0040] The clamping mechanism includes a first bevel column 9 and a second bevel column 10. The first bevel column 9 and the second bevel column 10 are respectively fixedly connected to the two sides of the movable mold 3. The upper end of the first bevel column 9 is slidably connected to the bottom of the first sliding mold 4, and the upper end of the second bevel column 10 is slidably connected to the bottom of the second sliding mold 5.

[0041] The clamping mechanism also includes a third beveled column 11, a first beveled groove 12, a fourth beveled column 13, a second beveled groove 14, a clamping column 15, a first clamping groove 16, a clamping plate 17, and a second clamping groove 18. The third beveled column 11 and the fourth beveled column 13 are respectively fixedly connected to both sides of the fixed mold 2, the first beveled groove 12 and the second beveled groove 14 are opened on both sides of the movable mold 3, the third beveled column 11 and the first beveled groove 12 are clamped with each other, the fourth beveled column 13 and the second beveled groove 14 are clamped with each other, the clamping column 15 is fixedly connected to both sides of the first beveled column 9 and the second beveled column 10, the first clamping groove 16 is opened on the inner side of the third beveled column 11 and the fourth beveled column 13, the clamping column 15 and the first clamping groove 16 are clamped with each other, the clamping plate 17 is fixedly connected to the bottom of the third beveled column 11 and the fourth beveled column 13, the second clamping groove 18 is opened at the bottom of the movable mold 3, and the clamping plate 17 and the first clamping groove 16 are clamped with each other.

[0042] The support mechanism also includes a second support column 28, a second fastening plate 29, and a bottom plate 30. The second support column 28 is fixedly connected to the bottom of the movable mold 3, the second fastening plate 29 is fixedly connected to the lower end of the second support column 28, and the bottom plate 30 is fixedly connected to the bottom of the second fastening plate 29 by bolts. A first ejector pin 31 and a second ejector pin 32 are provided on the upper surface of the bottom plate 30. The first ejector pin 31 and the second ejector pin 32 extend through the interior of the movable mold 3, and the tops of the first ejector pin 31 and the second ejector pin 32 are parallel to the upper surface of the bottom of the movable mold 3.

[0043] A small hole is provided at the bottom of the injection tube 1 , and the small hole at the bottom of the injection tube 1 is communicated with the interiors of both the fixed mold 2 and the movable mold 3 .

[0044] In combination with the above preferred embodiments, the working principle of the present invention is as follows:

[0045] When the fixed mold 2 and the movable mold 3 are in a separated state, since the spring 19 is fixedly connected to the inner sides of the first sliding mold 4 and the second sliding mold 5, the first side plate 6 is fixedly connected to the side of the spring 19 away from the first sliding mold 4. Under the elastic stretching action of the spring 19, the first sliding mold 4 and the second sliding mold 5 will move to both sides and be in a separated state, but the spring 19 allows the first sliding mold 4 and the second sliding mold 5 to move only a short distance. At this time, the outer ends of the first sliding mold 4 and the second sliding mold 5 can still engage with the upper ends of the first bevel column 9 and the second bevel column 10.

[0046] When the mold starts working, the bottom plate 30 causes the second support column 28 to drive the movable mold 3 to move toward one side of the fixed mold 2 through the second fastening plate 29, and the movable mold 3 drives the first bevel column 9 and the second bevel column 10 to move synchronously toward one side of the fixed mold 2. When the first bevel column 9 and the second bevel column 10 contact the first sliding mold 4 and the second sliding mold 5, the first sliding mold 4 and the second sliding mold 5 will be slidably connected with the first bevel column 9 and the second bevel column 10 and generate an extrusion force during the continued movement. Under the action of the extrusion force, the first sliding mold 4 and the second sliding mold 5 move toward the direction close to the injection tube 1 and compress the spring 19. The two baffles extending from one end of the first sliding mold 4 and the second sliding mold 5 close to the injection tube 1 will be tightly connected. At the same time, the two baffles extending from the first sliding mold 4 and the second sliding mold 5 A fixing plate 8 is provided above the baffle, which can perform secondary sealing on the connecting portion of the first slide 4 and the second slide 5, so that no injection molding material can leak between the first slide 4 and the second slide 5, forming a closed environment. At the same time, whether the first slide 4 and the first bevel column 9 are fully engaged can be effectively judged to be completely merged with the fixed mold 2 and the movable mold 3, thereby avoiding the phenomenon of different sizes of the packaging boxes due to looseness of the fixed mold 2 and the movable mold 3. At the same time, the mutual engagement of the clamping column 15 and the first clamping groove 16 can effectively fix the clamping position of the first bevel column 9 and the second bevel column 10, thereby avoiding misalignment of the bevel column and the slide, causing changes in the injection cavity, preventing deformation of the packaging box during injection of the molding material, and preventing leakage of the molding material during injection.

[0047] At the same time, the third bevel column 11 and the fourth bevel column 13 fixedly connected to the fixed mold 2 will be clamped with the first bevel groove 12 and the second bevel groove 14 on both sides of the movable mold 3, and the clamping columns 15 on both sides of the first bevel column 9 and the second bevel column 10 will be clamped with the first clamping groove 16 provided on the inner side of the third bevel column 11 and the fourth bevel column 13. At this time, the bottom of the third bevel column 11 and the first bevel groove 12 are clamped with each other, and the bottom of the fourth bevel column 13 and the second bevel groove 14 are clamped with each other. The fixed mold 2 and the movable mold 3 are tightly connected through the mechanism, which increases the tightness of the fixed mold 2 and the movable mold 3, avoids the mechanical fatigue of the device and the easy dislocation during the movement of the movable mold 3, and prevents the generation of a gap when the movable mold 3 and the fixed mold 2 are closed, thereby avoiding the injection molding material from flowing out of the gap generated by the movable mold 3 and the fixed mold 2 during the blank forming process, resulting in burrs on the injection molding of the packaging box.

[0048] When the fixed mold 2 and the movable mold 3 are completely merged, since the bottom of the top plate 20 is connected to the first slide 21 and the second slide 22, the bottom of the first slide 21 and the second slide 22 is fixedly installed with a baffle 23, and the four corners of the bottom of the baffle 23 are fixedly connected to the first support column 24, and the lower end of the first support column 24 is fixedly connected to the first fastening plate 25. The first fastening plate 25 is fixedly connected to the top of the fixed mold 2 by bolts, so that the fixed mold 2 is in a fixed state through the top plate 20, and the movable mold 3 can no longer move forward. Finally, the movable mold 3 is completely engaged with the fixed mold 2 to form a closed environment. The internal gap between the movable mold 3 and the fixed mold 2 is the mold cavity for forming the packaging box.

[0049] When the molds are completely merged, the injection material is heated into liquid by the injection device outside the injection tube 1, and is injected into the mold cavity formed by the merger of the fixed mold 2 and the movable mold 3 through the inside of the injection tube 1, and is cooled and formed in the closed space, waiting for the separation of the fixed mold 2 and the movable mold 3.

[0050] After the mold is injection-molded, the fixed mold 2 and the movable mold 3 will begin to separate. At this time, the first beveled column 9 on the movable mold 3 will separate from the first slide 4, and the second beveled column 10 will separate from the second slide 5. Since the meshing of the two is an inclination, the pressure of the first beveled column 9 on the first slide 4 will decrease until it disappears during separation, and the pressure of the second beveled column 10 on the second slide 5 will decrease until it disappears. Under the elastic stretching action of the spring 19, the first slide 4 and the second slide 5 begin to slide away from the injection tube 1. During the sliding of the first slide 4 and the second slide 5, the already injection-molded packaging box will not move due to the obstruction of the first beveled column 9 and the second beveled column 10, thereby forming a misalignment between the first slide 4 and the second slide 5 and the already injection-molded packaging box. The packaging box and the first slide 4 and the second slide 5 are misaligned. During the movement, it is impossible to adhere to the bottom surface of the first sliding mold 4 and the second sliding mold 5. At the same time, the packaging box will also be disconnected from the bottom of the injection tube 1, ensuring that the bottom of the packaging box is flat and smooth. Finally, the movable mold 3 leaves the fixed mold 2, and the packaging box will be fixed inside the movable mold 3 and exit the mold cavity formed by the movable mold 3 and the fixed mold 2 together with the movable mold 3. The packaging box is completely separated from the fixed mold 2 and the injection tube 1, preventing the packaging box and the injection tube 1 from being connected due to cooling, and avoiding the phenomenon of incomplete or excess residual materials when the packaging box is separated. At the same time, it is avoided that after the packaging box is cooled and formed, as the movable mold 3 is separated from the fixed mold 2, the packaging box cannot be demolded. This further prevents the packaging box injection molding failure and the movable mold 3 from being unable to perform subsequent packaging box molding work again, protecting the production efficiency of the mold, and also reducing the probability of defective packaging boxes. When the fixed mold 2 and the movable mold 3 are separated, the packaging box exists on the movable mold 3. At this time, the first ejector pin 31 and the second ejector pin 32 are pushed upward by the external pushing device, so that the packaging box is completely separated from the movable mold 3, and the production of the packaging box is completed at this time.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A molding die sealing device for injection molding of packaging boxes, comprising an injection tube (1), a fixed die (2) fixedly mounted at the bottom of the injection tube (1), and a movable die (3) disposed below the fixed die (2), characterized in that: The bottom of the fixed mold (2) is provided with a sliding mechanism for dislocating and separating the packaging box, the connection between the fixed mold (2) and the movable mold (3) is provided with a clamping mechanism for sealing the injection molding material to prevent leakage, the top of the fixed mold (2) is provided with a supporting mechanism for fixing the fixed mold (2), and the bottom of the movable mold (3) is provided with a supporting mechanism for fixing the movable mold (3).

2. The device for closing a molding die for injection molding of a packaging box according to claim 1, characterized in that: The support mechanism includes a top plate (20), a first slide plate (21), a second slide plate (22), a baffle plate (23), a first support column (24), and a first fastening plate (25). The top plate (20) is fixedly connected to the upper end of the outer wall of the injection tube (1). The first slide plate (21) and the second slide plate (22) are both slidably connected to the bottom of the top plate (20). The baffle plate (23) is fixedly installed on the bottom of the first slide plate (21) and the second slide plate (22). Four first support columns (24) are provided. The four first support columns (24) are respectively fixedly connected to the four corners of the bottom of the baffle plate (23). The first fastening plates (25) are all fixedly connected to the lower ends of the first support columns (24). The first fastening plate (25) is fixedly connected to the top of the fixed mold (2) by bolts.

3. The molding die sealing device for packaging box injection molding production according to claim 1, characterized in that: The sliding mechanism includes a first sliding mold (4), a second sliding mold (5), a first side plate (6), a second side plate (7), a fixed plate (8), and a spring (19). The first sliding mold (4) and the second sliding mold (5) are both fixedly connected to the bottom of the fixed mold (2). There are two groups of springs (19), each group of springs (19) is provided with three springs. The two groups of springs (19) are respectively fixedly connected to the inner sides of the first sliding mold (4) and the second sliding mold (5). The first side plate (6) is fixedly connected to the side of the spring (19) away from the first sliding mold (4). The second side plate (7) is fixedly connected to the side of the spring (19) away from the second sliding mold (5). The fixed plate (8) is fixedly connected between the first side plate (6) and the second side plate (7). The fixed plate (8) is fixedly connected to the bottom of the injection tube (1).

4. The device for closing a molding die for injection molding of a packaging box according to claim 2, characterized in that: The sliding mechanism also includes a first fixed column (26) and a second fixed column (27), wherein the first fixed column (26) is fixedly connected to the top of the first sliding mold (4), the first slide plate (21) is fixedly connected to the top of the first fixed column (26), the second fixed column (27) is fixedly connected to the top of the second sliding mold (5), and the second slide plate (22) is fixedly connected to the top of the second fixed column (27).

5. The molding die sealing device for packaging box injection molding production according to claim 3, characterized in that: The clamping mechanism comprises a first bevel column (9) and a second bevel column (10), wherein the first bevel column (9) and the second bevel column (10) are respectively fixedly connected to two sides of the movable mold (3), the upper end of the first bevel column (9) is slidably connected to the bottom of the first sliding mold (4), and the upper end of the second bevel column (10) is slidably connected to the bottom of the second sliding mold (5).

6. The molding die sealing device for packaging box injection molding production according to claim 5, characterized in that: The clamping mechanism further comprises a third beveled column (11), a first oblique groove (12), a fourth beveled column (13), a second oblique groove (14), a clamping column (15), a first clamping groove (16), a clamping plate (17), and a second clamping groove (18); the third beveled column (11) and the fourth beveled column (13) are respectively fixedly connected to both sides of the fixed mold (2); the first oblique groove (12) and the second oblique groove (14) are opened on both sides of the movable mold (3); the third beveled column (11) and the first oblique groove (12) are clamped to each other; the fourth beveled column (13) and the third beveled column (11) are clamped to each other; The two oblique grooves (14) are mutually clamped, the clamping column (15) is fixedly connected to both sides of the first oblique angle column (9) and the second oblique angle column (10), the first clamping groove (16) is opened on the inner side of the third oblique angle column (11) and the fourth oblique angle column (13), the clamping column (15) and the first clamping groove (16) are mutually clamped, the clamping plate (17) is fixedly connected to the bottom of the third oblique angle column (11) and the fourth oblique angle column (13), the second clamping groove (18) is opened at the bottom of the movable mold (3), and the clamping plate (17) and the first clamping groove (16) are mutually clamped.

7. The molding die sealing device for packaging box injection molding production according to claim 1, characterized in that: The support mechanism further includes a second support column (28), a second fastening plate (29), and a bottom plate (30), wherein the second support column (28) is fixedly connected to the bottom of the movable mold (3), the second fastening plate (29) is fixedly connected to the lower end of the second support column (28), and the bottom plate (30) is fixedly connected to the bottom of the second fastening plate (29) by bolts.

8. The molding die sealing device for packaging box injection molding production according to claim 7, characterized in that: A first ejector pin (31) and a second ejector pin (32) are provided on the upper surface of the base plate (30), the first ejector pin (31) and the second ejector pin (32) pass through the interior of the movable mold (3), and the tops of the first ejector pin (31) and the second ejector pin (32) are parallel to the bottom upper surface of the movable mold (3).

9. The molding die sealing device for packaging box injection molding production according to claim 1, characterized in that: A small hole is provided at the bottom of the injection tube (1), and the small hole at the bottom of the injection tube (1) is communicated with the interiors of both the fixed mold (2) and the movable mold (3).

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