Blowing mold convenient to demold

Abstract

The invention relates to the technical field of blow molding molds, in particular to a blow molding mold convenient to demold, which comprises a mounting frame, a mold assembly and an ejection assembly, a telescopic motor is arranged at the top of the mounting frame, the mold assembly comprises an upper mold and a lower mold, and the output end of the telescopic motor is connected with the upper mold; the upper mold and the lower mold are respectively provided with two forming cavities, and an air inlet hole is formed in the closed position of the upper mold and the lower mold and is communicated with the forming cavities; a communicating groove is formed between the two forming cavities, and a top hole is formed in the communicating groove of the lower mold; the ejection assembly comprises an ejection rod, a push plate and a first spring, the ejection rod is arranged in the ejection hole, an ejection groove is formed in the bottom of the lower mold, the push plate is arranged at the bottom of the ejection rod, the first spring is arranged between the push plate and the inner wall of the ejection groove, and clamping assemblies are arranged on the two sides of the ejection rod and used for limiting the ejection rod. In the demolding process, the ejection position is located in the communicating groove, damage to a plastic product can be reduced, and demolding work is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of blow moulds, in particular to a blow mould which is easy to demould. Background Art

[0002] The hollow blow molding mold is to put the tubular thermoplastic plastic blank extruded from the extruder and still in a softened state into the molding mold, and then introduce compressed air, and use the air pressure to deform the blank along the mold cavity, so as to blow it into a hollow product with a short neck. Hollow blow molding has been widely used to produce various thin-shell hollow products, chemical and daily packaging containers, and children's toys. Hollow blow molding (also known as blow molding) is a method of using gas pressure to inflate the hot melt embryo closed in the mold to form a hollow product. It is the third most commonly used plastic processing method and also a faster-growing plastic molding method.

[0003] Chinese patent CN218535589U discloses an oil bottle blow molding mold with automatic demoulding. The controller drives the output end of the cylinder to contract, thereby driving the upper mold away from the lower mold. Since the upper mold and several ejector rods are fixedly connected in turn by L-plates and push plates, the several ejector rods are driven to rise synchronously, and the oil bottles in the three second half cavities are automatically ejected to achieve demoulding, without the need for manual mold removal, thereby improving product unloading efficiency, avoiding frequent manual contact with the mold, and reducing safety hazards.

[0004] However, this patent still has the following problems: during the automatic demoulding process, when the ejector pin pushes out the engine oil bottle, due to the small tip of the ejector pin, stress is concentrated when it contacts the engine oil bottle and is ejected, which can easily damage the engine oil bottle and affect the quality of the molding after demoulding. Summary of the invention

[0005] The purpose of the present application is to provide a blow molding mold that is easy to demould, wherein the push plate pushes the ejector rod upward under the action of the first spring. The ejector rod passes through the ejection hole in the connecting groove of the lower mold and directly pushes against the plastic body formed in the connecting groove between the two plastic products, thereby reducing direct contact with the plastic products during the demoulding process, reducing the risk of scratching or deformation on the surface of the plastic products, and improving the quality of the plastic products after demoulding.

[0006] To achieve the above-mentioned purpose, the present application provides a blow molding mold that is easy to demold, including a mounting frame, a mold assembly and an ejection assembly, wherein a telescopic motor is arranged on the top of the mounting frame, and the mold assembly is arranged on the mounting frame; the mold assembly includes an upper mold and a lower mold, and the output end of the telescopic motor passes through the top of the mounting frame and is connected to the upper mold; two molding cavities are respectively provided on the upper mold and the lower mold, and an air inlet is provided at the closed position of the upper mold and the lower mold, and the air inlet is connected to the molding cavity; an injection port is provided on the top of the upper mold, and the injection port is connected to the molding cavity; a connecting groove is provided between the two molding cavities, and a top hole is provided in the connecting groove of the lower mold; the ejection assembly includes a push rod, a push plate and a first spring, the push rod is arranged inside the top hole, the bottom of the lower mold is provided with a top groove, the push plate is arranged at the bottom of the push rod, and a first spring is provided between the push plate and the inner wall of the top groove, and positioning assemblies are provided on both sides of the push rod, and the positioning assemblies are used to limit the push rod.

[0007] As a further solution of the present invention: the locking assembly includes a locking block and a second spring, telescopic grooves are provided on both sides of the top hole, the locking block is slidably arranged in the telescopic groove, one end of the second spring is connected to the inner wall of the telescopic groove, and the other end is connected to the locking block, slots are provided on both sides of the top rod, the locking block is engaged with the slots, and the side of the locking block facing the top groove is provided with a rounded corner.

[0008] As a further solution of the present invention: a molding base is provided on one side of the lower mold, a molding bottom groove is provided on one side of the upper mold, the molding base is adapted to the molding bottom groove, a positioning hole is provided on the molding base, a positioning rod is provided in the molding bottom groove, and the size of the positioning rod is adapted to the positioning hole.

[0009] As a further solution of the present invention: a semicircular groove is provided on the other side of the upper mold, a semicircular block is provided in the semicircular groove, and the semicircular block is fixed in the semicircular groove by a screw, and a semicircular block is synchronously provided on the lower mold, and when the upper mold and the lower mold are closed, the air inlet hole is provided between the two semicircular blocks.

[0010] As a further solution of the present invention: a cooling cavity is provided inside the upper mold and the lower mold, wherein one end of the cooling cavity is connected to the water inlet pipe, and the other end is connected to the drain pipe.

[0011] As a further solution of the present invention: a plurality of the communicating grooves are provided, and a pressing ring is connected between the push plates at the bottom of the plurality of push rods provided in the communicating grooves.

[0012] As a further solution of the present invention: guide pillars are arranged around the bottom of the upper mold, and the guide pillars are slidably matched with guide holes opened in the lower mold.

[0013] As a further solution of the present invention: the cooling cavity is designed to be S-shaped.

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

[0015] 1. The present invention pushes the ejector rod upwards by the push plate under the action of the first spring. The ejector rod passes through the ejection hole in the connecting groove of the lower mold and directly pushes on the plastic body formed in the connecting groove between the two plastic products, thereby reducing direct contact with the plastic products during the demoulding process, reducing the risk of scratching or deformation on the surface of the plastic products, and improving the quality of the plastic products after demoulding.

[0016] 2. Before the demoulding process of the present invention begins, the card block extends out under the elastic force of the second spring to engage with the card slot on the ejector rod, the ejector rod is in a fixed state, and at this time the top of the ejector rod seals the top hole in the connecting groove. During the demoulding process, the ejector rod compresses the first spring to push upward, and the force compresses the card block, which shrinks into the telescopic groove by compressing the second spring, releasing the engagement with the ejector rod. A rounded corner is provided on the side of the card block facing the top groove to reduce the friction between the ejector rod and the card block, making it easier for the ejector rod to extend. After the demoulding is completed, the ejector rod is reset under the reverse elastic force of the first spring until the card block extends out to engage with the card slot, facilitating the next demoulding operation.

[0017] 3. The present invention ensures the accurate alignment of the upper mold and the lower mold during the closing process by matching the molding base with the molding bottom groove and the positioning hole with the positioning rod. This helps to reduce the problem of poor molding caused by misalignment and improve the molding accuracy and consistency of plastic products.

[0018] 4. The present invention increases the contact area and time between the water flow and the mold wall by setting an S-shaped cooling cavity, improves the heat exchange efficiency, and enables the plastic product to achieve the required hardness and shape stability in a shorter time. At the same time, the uniform distribution of cooling water in the S-shaped path helps to achieve uniform cooling inside the mold, avoiding problems such as deformation or cracking of plastic products caused by excessively high or low local temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a blow molding mold that is easy to demould.

[0021] Figure 2 Installation diagram of upper and lower molds Figure 1 .

[0022] Figure 3 Installation diagram of upper and lower molds Figure 2 .

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the lower mold.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the upper mold.

[0025] Figure 6 Install the cutaway view for the ejector assembly.

[0026] Figure 7 This is a schematic diagram of the cooling chamber connection.

[0027] The reference numerals in the figure are: 1. mounting frame; 11. telescopic motor; 2. upper mold; 21. semicircular groove; 22. semicircular block; 23. air inlet; 24. injection port; 25. guide column; 3. lower mold; 31. top groove; 4. molding cavity; 5. connecting groove; 51. top hole; 52. telescopic groove; 53. second spring; 54. block; 541. fillet; 6. ejector rod; 61. slot; 62. push plate; 63. first spring; 7. molding base; 71. positioning hole; 72. molding bottom groove; 73. positioning rod; 8. water inlet pipe; 81. cooling cavity; 82. drain pipe; 9. pressing ring. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] like Figures 1 to 7 As shown, a blow molding mold for easy demoulding includes a mounting frame 1, a mold assembly and an ejector assembly. A telescopic motor 11 is arranged on the top of the mounting frame 1, and the mold assembly is arranged on the mounting frame 1; the mold assembly includes an upper mold 2 and a lower mold 3, and the output end of the telescopic motor 11 passes through the top of the mounting frame 1 and is connected to the upper mold 2; two molding cavities 4 are respectively provided on the upper mold 2 and the lower mold 3, and an air inlet 23 is provided at the closing part of the upper mold 2 and the lower mold 3, and the air inlet 23 is communicated with the molding cavity 4; an injection port 24 is provided on the top of the upper mold 2, and the injection port 24 is communicated with the molding cavity 4;

[0030] The upper mold 2 is driven down by the telescopic motor 11 and is tightly closed with the lower mold 3 to form a closed molding cavity 4. The molten plastic raw material is injected into the molding cavity 4 through the injection port 24 at the top of the upper mold 2. The injection port 24 is directly connected to the molding cavity 4 to ensure that the plastic raw material enters smoothly. As the plastic raw material is injected, compressed air is injected into the molding cavity 4 through the air inlet 23. The compressed air causes the plastic raw material to expand in the molding cavity 4 and fit tightly to the inner wall of the mold, gradually cool and solidify, and form the desired plastic product.

[0031] A connecting groove 5 is provided between the two forming cavities 4, and a top hole 51 is provided in the connecting groove 5 of the lower mold 3; the ejection assembly includes a push rod 6, a push plate 62 and a first spring 63, the push rod 6 is arranged inside the top hole 51, a top groove 31 is provided at the bottom of the lower mold 3, the push plate 62 is arranged at the bottom of the push rod 6, and a first spring 63 is provided between the push plate 62 and the inner wall of the top groove 31, and positioning assemblies are provided on both sides of the push rod 6, and the positioning assemblies are used to limit the push rod 6.

[0032] When the plastic product is cooled and solidified, the telescopic motor 11 drives the upper mold 2 to rise and separate from the lower mold 3, exposing the plastic product in the molding cavity 4. At this time, the ejector assembly starts to work. In the top groove 31 at the bottom of the lower mold 3, the push plate 62 pushes the ejector 6 upward under the action of the first spring 63. The ejector 6 passes through the top hole 51 in the connecting groove 5 of the lower mold 3, and directly pushes on the plastic body formed in the connecting groove 5 between the two plastic products, reducing direct contact with the plastic product during the demolding process, reducing the risk of scratching or deformation on the surface of the plastic product, and improving the quality of the plastic product after demolding.

[0033] The locking assembly includes a locking block 54 and a second spring 53. Telescopic grooves 52 are provided on both sides of the top hole 51. The locking block 54 is slidably arranged in the telescopic groove 52. One end of the second spring 53 is connected to the inner wall of the telescopic groove 52, and the other end is connected to the locking block 54. Slots 61 are provided on both sides of the top rod 6. The locking block 54 is engaged with the slots 61. A rounded corner 541 is provided on the side of the locking block 54 facing the top groove 31.

[0034] Before the demoulding process begins, the block 54 extends out under the elastic force of the second spring 53 to engage with the slot 61 on the push rod 6. The push rod 6 is in a fixed state, and at this time, the top of the push rod 6 seals the top hole 51 in the connecting groove 5. During the demoulding process, the push rod 6 compresses the first spring 63 to push upward, and the force compresses the block 54. The block 54 shrinks into the telescopic slot 52 by compressing the second spring 53, and the engagement with the push rod 6 is released. The side of the block 54 facing the top groove 31 is provided with a rounded corner 541 to reduce the friction between the push rod 6 and the block 54, so that the push rod 6 can be extended easily. After the demoulding is completed, the push rod 6 is reset under the reverse elastic force of the first spring 63 until the block 54 extends out to engage with the slot 61, so as to facilitate the next demoulding work.

[0035] A molding base 7 is provided on one side of the lower mold 3, and a molding bottom groove 72 is provided on one side of the upper mold 2. The molding base 7 is adapted to the molding bottom groove 72. A positioning hole 71 is opened on the molding base 7. A positioning rod 73 is provided in the molding bottom groove 72. The size of the positioning rod 73 is adapted to the positioning hole 71.

[0036] The matching of the molding base 7 and the molding bottom groove 72 and the cooperation of the positioning hole 71 and the positioning rod 73 ensures the accurate alignment of the upper mold 2 and the lower mold 3 during the closing process, which helps to reduce the problem of poor molding caused by misalignment and improve the molding accuracy and consistency of plastic products.

[0037] A semicircular groove 21 is provided on the other side of the upper mold 2, and a semicircular block 22 is provided in the semicircular groove 21. The semicircular block 22 is fixed in the semicircular groove 21 by a screw. A semicircular block 22 is synchronously provided on the lower mold 3. When the upper mold 2 and the lower mold 3 are closed, the air inlet 23 is provided between the two semicircular blocks 22.

[0038] A cooling cavity 81 is provided inside the upper mold 2 and the lower mold 3 , wherein one end of the cooling cavity 81 is connected to the water inlet pipe 8 , and the other end is connected to the drain pipe 82 ; the cooling cavity 81 is S-shaped.

[0039] By providing the S-shaped cooling cavity 81, the contact area and time between the water flow and the mold wall are increased, the heat exchange efficiency is improved, and the plastic product can achieve the required hardness and shape stability in a shorter time. At the same time, the uniform distribution of cooling water in the S-shaped path helps to achieve uniform cooling inside the mold, avoiding problems such as deformation or cracking of the plastic product caused by excessively high or low local temperature.

[0040] There are a plurality of communicating grooves 5 , and a pressing ring 9 is connected between the push plates 62 at the bottom of the plurality of push rods 6 arranged in the communicating grooves 5 .

[0041] By providing a plurality of ejector pins 6 and a pressing ring 9 for synchronous action, the efficiency and stability of demoulding can be significantly improved, which helps to reduce the deformation and damage of the plastic product during the demoulding process.

[0042] Guide pillars 25 are arranged around the bottom of the upper mold 2 , and the guide pillars 25 are slidably matched with the guide holes opened on the lower mold 3 .

[0043] The working principle of the present invention is as follows: the upper mold 2 is driven down by the telescopic motor 11, and is tightly closed with the lower mold 3 to form a closed molding cavity 4. The molten plastic raw material is injected into the molding cavity 4 through the injection port 24 at the top of the upper mold 2. The injection port 24 is directly connected to the molding cavity 4 to ensure that the plastic raw material enters smoothly. As the plastic raw material is injected, compressed air is injected into the molding cavity 4 through the air inlet 23. The compressed air causes the plastic raw material to expand in the molding cavity 4 and fit tightly to the inner wall of the mold, gradually cool and solidify, and form the desired plastic product.

[0044] When the plastic product is cooled and solidified, the telescopic motor 11 drives the upper mold 2 to rise and separate from the lower mold 3, exposing the plastic product in the molding cavity 4. At this time, the ejector assembly starts to work. In the top groove 31 at the bottom of the lower mold 3, the push plate 62 pushes the ejector rod 6 upward under the action of the first spring 63. The ejector rod 6 passes through the top hole 51 in the connecting groove 5 of the lower mold 3, and directly pushes on the plastic body formed in the connecting groove 5 between the two plastic products, ejecting the plastic product to complete the demoulding work.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A blow molding mold that is easy to demould, comprising a mounting frame (1), a mold assembly and an ejection assembly, wherein a telescopic motor (11) is arranged on the top of the mounting frame (1), and the mold assembly is arranged on the mounting frame (1); It is characterized in that The mold assembly comprises an upper mold (2) and a lower mold (3); the output end of the telescopic motor (11) passes through the top of the mounting frame (1) and is connected to the upper mold (2); Two molding cavities (4) are respectively provided on the upper mold (2) and the lower mold (3); an air inlet (23) is provided at the closed position of the upper mold (2) and the lower mold (3), and the air inlet (23) is communicated with the molding cavity (4); an injection port (24) is provided at the top of the upper mold (2), and the injection port (24) is communicated with the molding cavity (4); a connecting groove (5) is provided between the two molding cavities (4), and a top hole (51) is provided in the connecting groove (5) of the lower mold (3); The ejection assembly comprises a push rod (6), a push plate (62) and a first spring (63); the push rod (6) is arranged inside the top hole (51); a top groove (31) is arranged at the bottom of the lower mold (3); the push plate (62) is arranged at the bottom of the push rod (6); and a first spring (63) is arranged between the push plate (62) and the inner wall of the top groove (31); and positioning assemblies are arranged on both sides of the push rod (6); the positioning assemblies are used to limit the push rod (6).

2. A blow molding mold that is easy to demould according to claim 1, It is characterized in that The locking assembly comprises a locking block (54) and a second spring (53). Telescopic grooves (52) are provided on both sides of the top hole (51). The locking block (54) is slidably arranged in the telescopic groove (52). One end of the second spring (53) is connected to the inner wall of the telescopic groove (52), and the other end is connected to the locking block (54). Slots (61) are provided on both sides of the top rod (6). The locking block (54) is engaged with the slots (61). A rounded corner (541) is provided on the side of the locking block (54) facing the top groove (31).

3. A blow molding mold that is easy to demould according to claim 1, It is characterized in that A molding base (7) is provided on one side of the lower mold (3), a molding bottom groove (72) is provided on one side of the upper mold (2), the molding base (7) is matched with the molding bottom groove (72), a positioning hole (71) is provided on the molding base (7), a positioning rod (73) is provided in the molding bottom groove (72), and the size of the positioning rod (73) is matched with the positioning hole (71).

4. A blow molding mold that is easy to demould according to claim 3, It is characterized in that A semicircular groove (21) is provided on the other side of the upper mold (2), a semicircular block (22) is provided in the semicircular groove (21), and the semicircular block (22) is fixed in the semicircular groove (21) by a screw. A semicircular block (22) is synchronously provided on the lower mold (3), and when the upper mold (2) and the lower mold (3) are closed, the air inlet hole (23) is provided between the two semicircular blocks (22).

5. A blow molding mold that is easy to demould according to claim 1, It is characterized in that A cooling cavity (81) is provided inside the upper mold (2) and the lower mold (3), wherein one end of the cooling cavity (81) is connected to the water inlet pipe (8), and the other end is connected to the drain pipe (82).

6. A blow molding mold that is easy to demould according to claim 1, It is characterized in that A plurality of the communicating grooves (5) are provided, and a pressing ring (9) is connected between the push plates (62) at the bottom of the plurality of push rods (6) provided in the communicating grooves (5).

7. A blow molding mold that is easy to demould according to claim 1, It is characterized in that Guide pillars (25) are arranged around the bottom of the upper mold (2), and the guide pillars (25) are slidably matched with guide holes provided on the lower mold (3).

8. A blow molding mold that is easy to demould according to claim 5, It is characterized in that The cooling chamber (81) is designed to be S-shaped.

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