Injection mold demolding structure for long-size part production

Abstract

The utility model discloses a demoulding structure of an injection mould for producing long-size parts, which relates to the technical field of injection demoulding and comprises a fixed mould fixed on a base of an injection molding machine, an injection molding cavity is arranged in the fixed mould, a movable mould is arranged on the right side surface of the fixed mould, the fixed mould is connected with the movable mould through a positioning structure, an injection molding opening is arranged at the right end of the movable mould, and the injection molding cavity is arranged in the injection molding cavity. A combined push-out mechanism is arranged at the left end of the fixed mold, and a cooling assembly for reducing the temperature of the fixed mold is arranged on the fixed mold. According to the utility model, the combined push-out mechanism is arranged, and the stroke of the reciprocating motion of the sliding column is shortened, the space occupied by the mold is reduced, the demolding speed of an injection molded part is accelerated and the production efficiency is improved in a manner of combining direct pushing and high-pressure gas pushing.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding and demoulding, in particular to an injection mold demoulding structure for producing long-size parts. Background Art

[0002] Injection molding refers to the process of injecting heated molten plastic into an injection mold under high pressure by an injection molding machine. The plastic injected into the mold is cooled and then demolded to obtain a formed plastic product. The dimensional accuracy of the formed plastic product depends to a large extent on the accuracy of the mold. The injection molding production of extra-long plastic parts requires extra-long injection molds. Under the same accuracy requirements, extra-long injection molds are more difficult to process. In order to ensure the dimensional accuracy of extra-long parts of the mold, high-strength and low-deformation materials are usually used, such as high-strength alloy steel as the mold material, or the extra-long parts are processed and assembled in sections during production to reduce the final error of the mold. When processing the mold, appropriate cooling measures are taken to reduce the thermal deformation of the mold. During the processing of the mold, laser measuring instruments or three-coordinate measuring instruments are used to accurately measure the size of the mold, and the processing plan is adjusted in time to reduce the mold error.

[0003] When using long injection molds to mass-produce long plastic parts, demolding is difficult. The patent document with announcement number CN213035191U describes a long-axis water-cooled injection mold. This injection mold uses an ejector pin with a length similar to the length of the injection cavity to push a push block to eject the injection-molded injection part out of the injection cavity for demolding. This structure makes the overall length of the mold longer, occupies a larger area, and requires a longer telescopic device to drive the ejector pin to move. The ejector pin has a longer stroke during demolding and the demolding speed is slower.

[0004] Based on this, a demoulding structure of an injection mold for producing long-size parts is now provided, which can eliminate the disadvantages of the existing device. Utility Model Content

[0005] The purpose of the utility model is to provide a demoulding structure of an injection mold for producing long-size parts, so as to solve the problems in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A demolding structure for an injection mold used in the production of long-sized parts includes a fixed mold fixed to a base of an injection molding machine, an injection cavity being provided in the fixed mold, a movable mold being provided on the right side of the fixed mold, the fixed mold and the movable mold being connected by a positioning structure, an injection port being provided at the right end of the movable mold, a combined ejection mechanism being provided at the left end of the fixed mold, and a cooling component being provided on the fixed mold to reduce the temperature of the fixed mold itself.

[0008] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0009] In an optional solution: the positioning structure includes a positioning hole provided on the right side of the fixed mold, and a positioning column is provided on the left side of the movable mold at a position corresponding to the positioning hole, and the inner diameter of the positioning hole matches the outer diameter of the positioning column.

[0010] In an optional scheme: the combined ejection mechanism includes a sliding cylinder arranged on the left end face of the fixed mold, the sliding cylinder is connected to the injection cavity, a sliding column is provided for sliding in the sliding cylinder, a limiting groove is provided at a position corresponding to the sliding cylinder on the left side face of the injection cavity, a limiting block is provided for sliding in the limiting groove, the depth of the limiting groove is equal to the thickness of the limiting block, the right end of the sliding column is connected to the left end of the limiting block, the left end of the sliding column is connected to a driving module that drives the sliding column to slide back and forth in the sliding cylinder, and the sliding column is provided with a gas conveying structure for pushing the injection molded part to be demolded.

[0011] In an optional solution: the driving module includes a fixed plate arranged on the base of the injection molding machine, an electric telescopic cylinder is horizontally provided on the right side of the fixed plate, the free end of the electric telescopic cylinder is connected to the lower connecting plate, a connecting groove is provided on the outer side of the sliding column near the left end, the top of the lower connecting plate is inserted into the connecting groove from the bottom, an upper connecting plate is provided above the lower connecting plate, the upper connecting plate is inserted into the connecting groove from the top, and the upper connecting plate and the lower connecting plate are connected by bolts.

[0012] In an optional solution: the gas delivery structure includes a gas delivery blind hole arranged on the left end face of the sliding column, the bottom of the gas delivery blind hole is provided with a gas delivery through hole connected to the side face of the sliding column, the left end face of the sliding column is provided with a gas pipe interface corresponding to the position of the gas delivery blind hole, and the sliding cylinder is provided with a sealing member in contact with the outer side face of the sliding column, and the distance between the sealing member and the left side face of the injection cavity is smaller than the distance between the gas delivery through hole and the right side face of the limit block.

[0013] In an optional solution, the sealing member includes a sealing groove provided in the sliding cylinder, a sealing ring is provided in the sealing groove, and an inner ring of the sealing ring is in close contact with the outer surface of the sliding column.

[0014] In an optional scheme: the cooling component includes a plurality of cooling water blind holes arranged around the injection cavity on the left end face of the fixed mold, the cooling water blind holes are distributed in a square shape on the circumference of the injection cavity, and a connecting blind hole is provided on the front side surface of the fixed mold corresponding to the right ends of the upper and lower cooling water blind holes, and the connecting blind hole openings are threadedly connected to the cover, and the upper surface of the fixed mold is provided with water outlet blind holes at the right ends of the front and rear cooling water blind holes, and the openings of the water outlet blind holes are provided with a water outlet pipe interface, and a water distribution tank is provided on the left side of the fixed mold, and the water distribution tank is connected to the left ends of all cooling water blind holes, and a water inlet is provided on the left end face of the water distribution tank.

[0015] In an optional solution, the inner wall of the injection cavity is provided with a Teflon coating.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The utility model is provided with a combined ejection mechanism, which shortens the reciprocating motion stroke of the sliding column by combining direct push and high-pressure gas push, reduces the space occupied by the mold, speeds up the demoulding speed of the injection molded parts, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the utility model from the front side perspective.

[0019] Figure 2 This is a schematic diagram of the structure of the utility model from the rear side perspective.

[0020] Figure 3 It is a schematic cross-sectional view of the front and left sides of the present invention.

[0021] Figure 4 It is a schematic diagram of the front side cross-sectional structure of the utility model.

[0022] Figure 5 For this utility model Figure 4 A partial enlarged view of middle A.

[0023] Figure 6 For this utility model Figure 4 A partial enlarged view of B.

[0024] Figure 7 It is a schematic diagram of the right side cross-sectional structure of the present invention.

[0025] Notes on figure markings: 101, fixed mold; 102, movable mold; 103, injection cavity; 104, injection port; 105, positioning hole; 106, positioning column; 201, sliding cylinder; 202, limiting groove; 203, sliding column; 204, limiting block; 205, air supply blind hole; 206, air supply through hole; 207, air pipe interface; 208, sealing groove; 209, sealing ring; 301, upper connecting plate; 302, lower connecting plate; 303, fixed plate; 304, electric telescopic cylinder; 305, connecting groove; 401, cooling water blind hole; 402, connecting blind hole; 403, water outlet blind hole; 404, water outlet pipe interface; 405, sealing cover; 406, water distribution tank; 407, water inlet. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0027] In one embodiment, Figure 1-Figure 7 As shown, a demolding structure of an injection mold for producing long-sized parts includes a fixed mold 101 fixed on the base of an injection molding machine, an injection cavity 103 is provided in the fixed mold 101, a movable mold 102 is provided on the right side of the fixed mold 101, the fixed mold 101 and the movable mold 102 are connected by a positioning structure, an injection port 104 is provided at the right end of the movable mold 102, a combined ejection mechanism is provided at the left end of the fixed mold 101, and a cooling component is provided on the fixed mold 101 to reduce the temperature of the fixed mold 101 itself.

[0028] In this embodiment, during injection molding, the movable mold 102 is pressed against the fixed mold 101, and the injection molding machine injects the molten plastic into the injection cavity 103 from the injection port 104. After the injection molding is completed, the temperature of the fixed mold 101 is lowered by the cooling component to cool the plastic in the injection cavity 103. The combined ejection structure quickly pushes the cooled injection molded part out of the injection cavity 103 to achieve demolding by combining direct pushing and high-pressure gas pushing.

[0029] In one embodiment, Figure 3 As shown, the positioning structure includes a positioning hole 105 arranged on the right side of the fixed mold 101, and a positioning column 106 is provided on the left side of the movable mold 102 at a position corresponding to the positioning hole 105. The inner diameter of the positioning hole 105 matches the outer diameter of the positioning column 106, thereby improving the stability of the combination between the fixed mold 101 and the movable mold 102.

[0030] In one embodiment, Figure 1 、 Figure 4 - Figure 6 As shown, the combined ejection mechanism includes a sliding cylinder 201 arranged on the left end surface of the fixed mold 101, the sliding cylinder 201 is connected to the injection cavity 103, a sliding column 203 is slidably provided in the sliding cylinder 201, a limiting groove 202 is provided at a position corresponding to the sliding cylinder 201 on the left side surface of the injection cavity 103, a limiting block 204 is slidably provided in the limiting groove 202, the depth of the limiting groove 202 is equal to the thickness of the limiting block 204, the right end of the sliding column 203 is connected to the left end of the limiting block 204, and the left end of the sliding column 203 is connected to drive the sliding column 203 The driving module slides back and forth in the sliding cylinder 201, and the sliding column 203 is provided with a gas conveying structure for pushing the injection molded part to be demoulded. During injection, the limit block 204 is stuck in the limit groove 202, and the right end face of the limit block 204 is flush with the left side face of the injection cavity 103. After the injection is completed, the driving module drives the sliding column 203 to move right, pushing the injection molded part in the injection cavity 103 to move to the right. At the same time, the gas outlet of the gas conveying structure is changed from a closed state to an open state and connected to the left side space of the injection molded part in the injection cavity 103, pushing the injection molded part to continue to move to the right until it is out of the injection cavity 103.

[0031] In one embodiment, Figure 1 、 Figure 4 and Figure 5 As shown, the driving module includes a fixed plate 303 arranged on the base of the injection molding machine, and an electric telescopic cylinder 304 is horizontally provided on the right side of the fixed plate 303. The free end of the electric telescopic cylinder 304 is connected to the lower connecting plate 302. A connecting groove 305 is provided on the outer side of the sliding column 203 near the left end. The top of the lower connecting plate 302 is inserted into the connecting groove 305 from the bottom. An upper connecting plate 301 is provided above the lower connecting plate 302. The upper connecting plate 301 is inserted into the connecting groove 305 from the top. The upper connecting plate 301 and the lower connecting plate 302 are connected by bolts. The electric telescopic cylinder 304 drives the lower connecting plate 302 to move left and right, and the lower connecting plate 302 cooperates with the upper connecting plate 301 to drive the sliding column 203 to slide left and right in the sliding cylinder 201.

[0032] In one embodiment, Figure 4 and Figure 6 As shown, the gas delivery structure includes a gas delivery blind hole 205 arranged on the left end face of the sliding column 203, and a gas delivery through hole 206 connected to the side of the sliding column 203 is provided at the bottom of the gas delivery blind hole 205, and an air pipe interface 207 is provided on the left end face of the sliding column 203 corresponding to the gas delivery blind hole 205. A sealing member in contact with the outer side of the sliding column 203 is provided in the sliding cylinder 201, and the distance between the seal and the left side of the injection cavity 103 is smaller than the distance between the gas delivery through hole 206 and the right side of the limit block 204. After the right end of the sliding column 203 enters the injection cavity 103, the gas delivery through hole 206 is connected to the injection cavity 103, and the high-pressure gas enters the injection cavity 103 from the gas delivery through hole 206 through the air pipe interface 207 and the gas delivery blind hole 205, pushing the injection molded part in the injection cavity 103 to move to the right and out of the injection cavity 103.

[0033] In one embodiment, Figure 6 As shown, the sealing member includes a sealing groove 208 arranged in the sliding cylinder 201, and a sealing ring 209 is provided in the sealing groove 208. The inner ring of the sealing ring 209 is tightly attached to the outer surface of the sliding column 203. When the gas supply hole 206 is located on the left side of the sealing member, the gas cannot enter the injection cavity 103 and affect the injection quality.

[0034] In one embodiment, Figure 3 、 Figure 4 and Figure 7As shown, the cooling assembly includes a plurality of cooling water blind holes 401 arranged around the injection cavity 103 on the left end surface of the fixed mold 101. The cooling water blind holes 401 are distributed in a square shape around the injection cavity 103. Connecting blind holes 402 are provided on the front side surface of the fixed mold 101 at positions corresponding to the right ends of the upper and lower cooling water blind holes 401. The openings of the connecting blind holes 402 are threadedly connected to covers 405. Water outlet blind holes 403 are provided on the upper surface of the fixed mold 101 at positions corresponding to the right ends of the front and rear cooling water blind holes 401. Water outlet blind holes 403 are provided at the openings of the water outlet blind holes 403. A water outlet pipe interface 404 is provided at the opening of the water outlet blind holes 403. A water distribution tank 406 is provided on the left side of the fixed mold 101. The water distribution tank 406 is connected to the left ends of all the cooling water blind holes 401. A water inlet 407 is provided on the left end surface of the water distribution tank 406. Cooling water enters the water distribution tank 406 from the water inlet 407. The water in the water distribution tank 406 flows through the cooling water blind holes 401 to cool the fixed mold 101. The connecting blind holes 402 connect the upper cooling water blind holes 401 and the lower cooling water blind holes 401. The water outlet blind holes 403 connect the front cooling water blind holes 401 and the rear cooling water blind holes 401. The connecting blind holes 402 cooperate with the water outlet blind holes 403 to connect the right ends of all the cooling water blind holes 401 and discharge the hot water heated by the fixed mold 101.

[0035] In one embodiment, Figure 3 As shown, the inner wall of the injection cavity 103 is provided with a Teflon coating, which helps to demould the injection molded part in the injection cavity 103.

[0036] The above embodiment discloses a demoulding structure of an injection mold for producing long-sized parts. During injection molding, the movable mold 102 is pressed against the fixed mold 101, and the limit block 204 is stuck in the limit groove 202. The right end face of the limit block 204 is flush with the left side face of the injection cavity 103. The injection molding machine injects the molten plastic into the injection cavity 103 from the injection port 104. After the injection molding is completed, cooling water enters the water distribution tank 406 from the water inlet 407. The water in the water distribution tank 406 flows through the cooling water blind hole 401 to cool the fixed mold 101. The hot water heated by the fixed mold 101 is discharged through the connecting blind hole 402 and the water outlet blind hole 403. After the injection molded part is cooled, the electric telescopic cylinder 304 drives The lower connecting plate 302 moves left and right, and the lower connecting plate 302 cooperates with the upper connecting plate 301 to drive the sliding column 203 to slide rightward in the sliding cylinder 201. The sliding column 203 drives the limit block 204 to push the injection molded part to move right. At this time, the gas supply hole 206 on the sliding column 203 is connected to the injection cavity 103, and the high-pressure gas enters the injection cavity 103 from the gas supply hole 206 through the air pipe interface 207 and the gas supply blind hole 205, pushing the injection molded part in the injection cavity 103 to continue to move quickly to the right and out of the injection cavity 103. After demolding is completed, the electric telescopic cylinder 304 drives the sliding column 203 to move left until the limit block 204 is stuck in the limit groove 202, and then the next round of injection molding is carried out.

[0037] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A demoulding structure for an injection mold for producing long-size parts, comprising a fixed mold (101) fixed to a base of an injection molding machine, an injection cavity (103) being provided in the fixed mold (101), and a movable mold (102) being provided on the right side of the fixed mold (101); It is characterized in that The fixed mold (101) and the movable mold (102) are connected via a positioning structure, an injection port (104) is provided at the right end of the movable mold (102), a combined ejection mechanism is provided at the left end of the fixed mold (101), and a cooling component for reducing the temperature of the fixed mold (101) is provided on the fixed mold (101); The combined ejection mechanism comprises a sliding cylinder (201) arranged on the left end surface of the fixed mold (101), the sliding cylinder (201) is communicated with the injection cavity (103), a sliding column (203) is slidably provided in the sliding cylinder (201), a limiting groove (202) is provided at a position corresponding to the sliding cylinder (201) on the left side surface of the injection cavity (103), a limiting block (204) is slidably provided in the limiting groove (202), the depth of the limiting groove (202) is equal to the thickness of the limiting block (204), the right end of the sliding column (203) is connected to the left end of the limiting block (204), the left end of the sliding column (203) is connected to a driving module that drives the sliding column (203) to slide back and forth in the sliding cylinder (201), and the sliding column (203) is provided with a gas conveying structure for promoting the demoulding of the injection molded part.

2. The demoulding structure of an injection mold for producing a long-size component according to claim 1, characterized in that: The positioning structure comprises a positioning hole (105) provided on the right side of the fixed mold (101), and a positioning column (106) is provided on the left side of the movable mold (102) at a position corresponding to the positioning hole (105), wherein the inner diameter of the positioning hole (105) matches the outer diameter of the positioning column (106).

3. The demoulding structure of an injection mold for producing a long-size component according to claim 1, characterized in that: The driving module comprises a fixed plate (303) arranged on the base of the injection molding machine, an electric telescopic cylinder (304) is horizontally arranged on the right side of the fixed plate (303), the free end of the electric telescopic cylinder (304) is connected to the lower connecting plate (302), a connecting groove (305) is provided on the outer side of the sliding column (203) near the left end, the top of the lower connecting plate (302) is plugged into the connecting groove (305) from below, an upper connecting plate (301) is provided above the lower connecting plate (302), the upper connecting plate (301) is plugged into the connecting groove (305) from above, and the upper connecting plate (301) and the lower connecting plate (302) are connected by bolts.

4. The demoulding structure of an injection mold for producing a long-size component according to claim 1, characterized in that: The gas delivery structure comprises a gas delivery blind hole (205) arranged on the left end face of the sliding column (203); a gas delivery through hole (206) communicating with the side face of the sliding column (203) is provided at the bottom of the gas delivery blind hole (205); a gas pipe interface (207) is provided at a position on the left end face of the sliding column (203) corresponding to the gas delivery blind hole (205); a sealing member in contact with the outer side face of the sliding column (203) is provided in the sliding cylinder (201); and a distance between the sealing member and the left side face of the injection cavity (103) is smaller than a distance between the gas delivery through hole (206) and the right side face of the limit block (204).

5. The demoulding structure of an injection mold for producing a long-size component according to claim 4, characterized in that: The sealing member comprises a sealing groove (208) provided in the sliding cylinder (201), a sealing ring (209) being provided in the sealing groove (208), and an inner ring of the sealing ring (209) being in close contact with the outer surface of the sliding column (203).

6. The demoulding structure of an injection mold for producing a long-size component according to claim 1, characterized in that: The cooling assembly comprises a plurality of cooling water blind holes (401) arranged around the injection cavity (103) on the left end face of the fixed mold (101), the cooling water blind holes (401) being distributed in a square shape around the injection cavity (103), a connecting blind hole (402) being provided on the front side face of the fixed mold (101) at positions corresponding to the right ends of the upper and lower cooling water blind holes (401), the openings of the connecting blind holes (402) being threadedly connected to a sealing cover (405), a water outlet blind hole (403) being provided on the upper surface of the fixed mold (101) at positions corresponding to the right ends of the front and rear cooling water blind holes (401), the openings of the water outlet blind holes (403) being provided with a water outlet pipe interface (404), a water distribution box (406) being provided on the left side face of the fixed mold (101), the water distribution box (406) being connected to the left ends of all the cooling water blind holes (401), and a water inlet (407) being provided on the left end face of the water distribution box (406).

7. The demoulding structure of an injection mold for producing a long-size component according to claim 1, characterized in that: The inner wall of the injection cavity (103) is provided with a Teflon coating.

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