Mold positioning point core-pulling structure

Abstract

The utility model discloses a mold positioning point core-pulling structure, and relates to the field of plastic tray injection molding, the mold positioning point core-pulling structure comprises a mold main body, a positioning seat is arranged on the mold main body, a mounting groove is formed in the positioning seat, the mounting groove is used for placing a steel pipe, a through hole is formed in the mounting groove, a positioning pin is arranged in the through hole, and the top of the positioning pin abuts against the bottom of the steel pipe; an adjusting assembly is arranged on the mold body and located below the through hole, and the adjusting assembly is connected with the positioning pin. The adjusting assembly drives the positioning pin to be inserted into the steel pipe to position the steel pipe, plastic melt is injected into the mold body, and after the mold is filled with the plastic melt, the adjusting assembly drives the positioning pin to retract, so that the positioning pin is flush with the inner wall of the bottom side of the mounting groove, injection molding continues to be conducted into the mold, and the plastic melt can fill the position of the positioning pin before; after injection molding is completed, no positioning hole is formed in the plastic tray, and therefore the problem that when the plastic tray is applied to the field of chemical engineering, chemical raw materials corrode steel pipes through the positioning hole is solved.

Description

Technical Field

[0001] The present application relates to the field of plastic pallet injection molding, and in particular to a mold positioning point core pulling structure. Background Art

[0002] Plastic pallets are a type of logistics unit used in conjunction with forklifts, shelves and other logistics equipment. They are used to store, load and transport goods and are essential equipment in modern logistics warehousing. At present, in order to improve the overall carrying capacity of plastic pallets, steel pipes need to be injected inside to improve the overall structural strength and carrying capacity.

[0003] Therefore, in the related art, when injection molding a plastic pallet, the steel tube needs to be positioned to prevent the steel tube from shifting during the injection molding process. The usual operation method is to set positioning pins on the mold to limit the steel tube during injection molding.

[0004] When the above-mentioned method of limiting the position of the steel pipe by the positioning pin is adopted, after injection molding, the position of the positioning pin will leave a positioning hole on the product. When the product is used in the chemical field, the chemical raw materials transported by the plastic pallet will fall into the positioning hole. The chemical raw materials will corrode the steel pipe, thereby affecting the overall service life of the plastic pallet. Utility Model Content

[0005] In order to avoid corrosion of steel pipes by chemical raw materials through positioning holes when used in the chemical industry, the present application provides a core pulling structure for mold positioning points.

[0006] The present application provides a mold positioning point core pulling structure, which adopts the following technical solutions:

[0007] A mold positioning point core pulling structure includes a mold main body, a positioning seat is arranged on the mold main body, a mounting groove is opened in the positioning seat, the mounting groove is used to place a steel pipe, a through hole is opened in the mounting groove, a positioning pin is arranged in the through hole, the top of the positioning pin abuts against the bottom of the steel pipe, and an adjustment component is arranged on the mold main body below the through hole, the adjustment component is connected to the positioning pin, and the adjustment component is used to adjust the protruding size of the positioning pin in the mounting groove.

[0008] By adopting the above technical solution, the adjustment component drives the positioning pin to insert into the steel pipe to position the steel pipe, and then injects plastic melt into the mold body. After the plastic melt fills the mold, the adjustment component drives the positioning pin to retract, so that the top end of the positioning pin is flush with the bottom inner wall of the mounting groove on the positioning seat, and then continues to inject into the mold. The plastic melt will fill the position of the previous positioning pin, so that after the injection molding is completed, there is no positioning hole on the plastic pallet, thereby effectively avoiding the problem of chemical raw materials corroding the steel pipe through the positioning hole when used in the chemical field.

[0009] Preferably, the adjustment assembly includes a cylinder fixedly arranged on the mold body, a push rod of the cylinder is inserted into the mold body, and the push rod of the cylinder is fixedly connected to an end of the positioning pin away from the steel pipe.

[0010] By adopting the above technical solution, the positioning pin is driven to move by a cylinder, which effectively improves the convenience of adjusting the positioning pin.

[0011] Preferably, a first limiting structure is provided on the positioning seat at the through hole, and the first limiting structure is used to limit the rising height of the positioning pin.

[0012] By adopting the above technical solution, the first limiting structure effectively avoids the problem of excessive extension of the positioning pin.

[0013] Preferably, the first limiting structure includes a first annular limiting block fixedly arranged at the top of the through hole, and the outer surface of the positioning pin located in the through hole is circumferentially fixed with a second annular limiting block that cooperates with the first annular limiting block. When the positioning pin moves to the highest point, the first annular limiting block abuts against the second annular limiting block.

[0014] By adopting the above technical solution, when the locating pin moves to the set highest point, the lower surface of the first annular limit block abuts against the upper surface of the second annular limit block, thereby limiting the upward movement of the locating pin, thereby effectively preventing the locating pin from extending too much.

[0015] Preferably, a second limiting structure is provided in the through hole, and the second limiting structure is used to limit the descending distance of the positioning pin.

[0016] By adopting the above technical solution, the problem that the positioning pin is lowered too much and the surface of the positioning pin is located below the inner wall of the installation groove is effectively avoided, and the effect of injection molding is effectively improved.

[0017] Preferably, the second limiting structure includes a third annular limiting block arranged in the through hole, and the push rod of the cylinder is inserted in the third annular limiting block. When the positioning pin moves until the upper surface is flush with the inner wall of the mounting groove, the bottom of the second annular limiting block abuts against the top of the third annular limiting block.

[0018] By adopting the above technical solution, when the locating pin descends to the point where the upper surface of the locating pin is flush with the inner wall of the installation groove, the bottom of the second annular limit block abuts against the top of the third annular limit block, thereby effectively limiting the descending distance of the locating pin.

[0019] Preferably, an installation space is formed between the first annular limit block and the second annular limit block, and an auxiliary retraction structure is provided in the installation space, and the auxiliary retraction structure is used to assist the positioning pin to retract to a position flush with the inner wall of the installation groove.

[0020] By adopting the above technical solution, the auxiliary retraction structure is used to improve the retraction efficiency of the positioning pin, thereby further improving the overall working efficiency of the device.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. The positioning pin is inserted into the steel pipe by the adjustment component to position the steel pipe, and then the plastic melt is injected into the mold body. After the plastic melt fills the mold, the adjustment component drives the positioning pin to retract, so that the top end of the positioning pin is flush with the bottom inner wall of the mounting groove on the positioning seat, and then the injection molding is continued into the mold. The plastic melt will fill the position of the previous positioning pin, so that after the injection molding is completed, there is no positioning hole on the plastic pallet, which effectively avoids the problem of chemical raw materials corroding the steel pipe through the positioning hole when used in the chemical field;

[0023] 2. When the positioning pin moves to the set highest point, the lower surface of the first annular limit block abuts against the upper surface of the second annular limit block, thereby limiting the upward movement of the positioning pin, thereby effectively preventing the positioning pin from extending too much;

[0024] 3. When the positioning pin descends to the point where the upper surface of the positioning pin is flush with the inner wall of the mounting groove, the bottom of the second annular limit block abuts against the top of the third annular limit block, thereby effectively limiting the descending distance of the positioning pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an axonometric diagram mainly showing the overall structure of the mold in this embodiment;

[0026] Figure 2 This is a longitudinal cross-sectional view mainly showing the mold structure of this embodiment;

[0027] Figure 3 for Figure 2 The enlarged schematic diagram of the part A in the middle mainly shows the first limiting structure and the second limiting structure.

[0028] Figure numerals: 1. mold body; 2. positioning seat; 3. mounting groove; 4. steel pipe; 5. through hole; 6. positioning pin; 7. cylinder; 8. first annular limit block; 9. second annular limit block; 10. third annular limit block. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings.

[0030] In the related art, when plastic pallets are injection molded, the steel tube 4 needs to be positioned to prevent the steel tube 4 from shifting during the injection molding process. The usual operation method is to set a positioning pin 6 on the mold to limit the position of the steel tube 4 during injection molding. After injection molding, the position of the positioning pin 6 will leave a positioning hole on the product. When the product is used in the chemical field, the chemical raw materials transported by the plastic pallet fall into the positioning hole, and the chemical raw materials will corrode the steel tube 4, thereby affecting the overall service life of the plastic pallet.

[0031] The embodiment of the present application discloses a mold positioning point core pulling structure.

[0032] Reference Figure 1 The mold positioning point core pulling structure includes a mold body 1, a positioning seat 2 arranged on the mold body 1, a mounting groove 3 provided on the positioning seat 2, a through hole 5 provided in the mounting groove 3, a positioning pin 6 provided in the through hole 5, and a cylinder 7 located on the mold body 1. The cylinder 7 is located on the side of the mold body 1 away from the positioning seat 2. The push rod of the cylinder 7 is penetrated in the mold body 1 and connected to the positioning pin 6 in the through hole 5. The cylinder 7 drives the positioning pin 6 to move in the through hole 5. The steel pipe 4 is placed in the mounting groove 3, and the bottom of the steel pipe 4 is positioned by the positioning pin 6.

[0033] During the injection molding process, the cylinder 7 drives the positioning pin 6 to insert into the steel pipe 4 to position the steel pipe 4, and then injects plastic melt into the mold body 1. After the plastic melt fills the mold, the cylinder 7 drives the positioning pin 6 to retract, so that the top end of the positioning pin 6 is flush with the bottom inner wall of the mounting groove 3 on the positioning seat 2, and then continues to inject into the mold. The plastic melt will fill the position of the previous positioning pin 6, so that after the injection molding is completed, there is no positioning hole on the plastic pallet, thereby avoiding the problem of chemical raw materials falling into the positioning hole and corroding the steel pipe 4 when there is a positioning hole in the existing plastic pallet.

[0034] Reference Figure 2 and Figure 3 In order to prevent the positioning pin 6 from extending too much, a first limiting structure can be provided at the through hole 5, and the rising height of the positioning pin 6 can be limited by the first limiting structure. Specifically, the first limiting structure includes a first annular limiting block 8 fixedly provided at the top of the through hole 5 and a second annular limiting block 9 fixedly provided on the outer surface of the positioning pin 6 and arranged circumferentially, wherein the first annular limiting block 8 cooperates with the second annular limiting block 9. When the positioning pin 6 moves to the set highest point, the lower surface of the first annular limiting block 8 abuts against the upper surface of the second annular limiting block 9, thereby limiting the upward movement of the positioning pin 6.

[0035] Reference Figure 3In order to prevent the positioning pin 6 from descending too much, causing the surface of the positioning pin 6 to be located below the inner wall of the mounting groove 3, a second limiting structure can be provided in the through hole 5. Specifically, the second limiting structure includes a third annular limiting block 10 provided in the through hole 5, wherein the third annular limiting block 10 is sleeved on the push rod of the cylinder 7, and the push rod of the cylinder 7 can slide along the inner wall of the shaft of the third annular limiting block 10. Further, the setting position of the third annular limiting block 10 is set according to the descending distance of the positioning pin 6. When the positioning pin 6 descends to the point where the upper surface of the positioning pin 6 is flush with the inner wall of the mounting groove 3, the bottom of the second annular limiting block 9 abuts against the top of the third annular limiting block 10, thereby limiting the descending distance of the positioning pin 6 and ensuring that the upper surface of the positioning pin 6 is flush with the inner wall of the mounting groove 3.

[0036] The implementation principle of the core pulling structure of a mold positioning point in an embodiment of the present application is as follows: during the injection molding process, the cylinder 7 drives the positioning pin 6 to insert into the steel pipe 4 to position the steel pipe 4, and then injects plastic melt into the mold body 1. After the plastic melt fills the mold, the cylinder 7 drives the positioning pin 6 to retract, so that the top end of the positioning pin 6 is flush with the bottom inner wall of the mounting groove 3 on the positioning seat 2, and then continues to inject molding into the mold. The plastic melt will fill the position of the previous positioning pin 6, so that after the injection molding is completed, there is no positioning hole on the plastic pallet.

[0037] In some other embodiments, an auxiliary retraction structure may be provided between the first annular stop block 8 and the second annular stop block 9, and the auxiliary retraction structure provides a certain thrust to assist the retraction of the positioning pin 6 when the positioning pin 6 is retracted. An installation space is formed between the first annular stop block 8 and the second annular stop block 9, and the installation space is an annular structure. The auxiliary retraction structure can use a component with a reset and rebound function and is provided in the installation space to achieve auxiliary rebound of the positioning pin 6.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A mold positioning point core pulling structure, comprising a mold body (1), a positioning seat (2) being arranged on the mold body (1), a mounting groove (3) being provided in the positioning seat (2), the mounting groove (3) being used to place a steel pipe (4), a through hole (5) being provided in the mounting groove (3), a positioning pin (6) being arranged in the through hole (5), the top of the positioning pin (6) being in contact with the bottom of the steel pipe (4), characterized in that: The mold body (1) is provided with an adjustment component located below the through hole (5), the adjustment component is connected to the positioning pin (6), and the adjustment component is used to adjust the protruding dimension of the positioning pin (6) in the installation groove (3).

2. A mold positioning point core pulling structure according to claim 1, characterized in that: The adjustment assembly comprises a cylinder (7) fixedly arranged on the mold body (1), a push rod of the cylinder (7) inserted into the mold body (1), and the push rod of the cylinder (7) is fixedly connected to an end of the positioning pin (6) away from the steel pipe (4).

3. A mold positioning point core pulling structure according to claim 2, characterized in that: A first limiting structure is provided on the positioning seat (2) at the through hole (5), and the first limiting structure is used to limit the rising height of the positioning pin (6).

4. A mold positioning point core pulling structure according to claim 3, characterized in that: The first limiting structure comprises a first annular limiting block (8) fixedly arranged at the top of the through hole (5); a second annular limiting block (9) cooperating with the first annular limiting block (8) is fixedly arranged circumferentially on the outer surface of the positioning pin (6) located in the through hole (5); when the positioning pin (6) moves to the highest point, the first annular limiting block (8) abuts against the second annular limiting block (9).

5. A mold positioning point core pulling structure according to claim 4, characterized in that: A second limiting structure is provided in the through hole (5), and the second limiting structure is used to limit the descending distance of the positioning pin (6).

6. A mold positioning point core pulling structure according to claim 5, characterized in that: The second limiting structure comprises a third annular limiting block (10) arranged in the through hole (5), the push rod of the cylinder (7) is inserted in the third annular limiting block (10), and when the positioning pin (6) moves until the upper surface is flush with the inner wall of the mounting groove (3), the bottom of the second annular limiting block (9) abuts against the top of the third annular limiting block (10).

7. A mold positioning point core pulling structure according to claim 4, characterized in that: An installation space is formed between the first annular limit block (8) and the second annular limit block (9), and an auxiliary retraction structure is provided in the installation space, the auxiliary retraction structure being used to assist the positioning pin (6) in retracting to a position flush with the inner wall of the installation groove (3).

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