Mould locking mechanism for large-area oil cylinder core pulling

Abstract

The utility model provides a mold locking mechanism for large-area oil cylinder core pulling, and belongs to the technical field of injection mold back-off treatment. The mold locking mechanism comprises a drawing stroke oil cylinder, an inner drawing guide rail, a forming inner drawing mold core, an oil cylinder for mold locking and a mold locking block. According to the utility model, the side mold locking structure is additionally arranged, so that the mold locking pressure required by large-area core pulling is dispersed to the core pulling oil cylinder and the side mold locking structure to be respectively borne, the oil cylinder pressure required by driving an inner pulling structure is obviously reduced, and the oil cylinder specification and the occupied area required by the inner pulling mechanism at the back-off part of a product are reduced; the boundary dimension and height of the mold are reduced, and the mold and injection molding cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of undercut processing of injection molds and relates to a locking mechanism for large-area oil cylinder core pulling. Background Art

[0002] In the process of molding of injection mold products, the undercut forms are usually handled by sliders, inclined tops or internal extraction structures. Among them, the internal extraction structure can be divided into two forms: mechanical floating internal extraction and oil cylinder internal extraction. Under normal circumstances, the movable side mostly adopts a mechanical floating internal extraction structure, while the fixed side generally adopts an oil cylinder to drive the internal extraction structure because it involves the injection molding system or hot runner system. At this time, the clamping pressure and space occupied by the oil cylinder must be considered. If the area of ​​the internal extraction structure involved in the injection molding is large, a cylinder with a large clamping pressure is required, and the required clamping cylinder diameter is also increased, which will increase the outer dimensions and thickness of the mold on the basis of the required mold opening structure, increase the material cost and processing cost of the mold; at the same time, it will extend to the injection molding cost required by the injection molding machine due to the mold size problem. If a smaller size oil cylinder is used, the clamping pressure of the oil cylinder at the internal extraction part will be insufficient, which is easy to cause the displacement of the internal extraction component and cause the mold function to be incomplete. Based on this, the utility model designs a large-area oil cylinder core pulling clamping mechanism, and by adding a lateral auxiliary clamping mechanism, the clamping pressure at the internal extraction component is shared to achieve the purpose of improving the mold function. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a locking mechanism for a large-area oil cylinder core pulling. By adding a side locking structure, the locking pressure required for large-area core pulling is dispersed to the core pulling cylinder and the side locking structure respectively, thereby significantly reducing the cylinder pressure required to drive the internal pulling structure, so that it only needs to bear the gravity required for the core pulling movement itself, thereby reducing the space required for the oil cylinder in the mold.

[0004] The technical solution of the utility model is:

[0005] A large-area oil cylinder core-pulling clamping mechanism comprises a pulling stroke oil cylinder 2, a connecting block A3, an inner pulling guide rail 4, a forming inner pulling core 5, a clamping oil cylinder 6, a fixing block 7, a connecting block B8, a fixing plate 9, a locking module 10, a wear-resistant plate and a limit switch.

[0006] One end of the molding inner pull-out core 5 is the molding surface of the undercut part of the product, and the other end surface is an inclined surface; the side surface of the inner pull-out guide rail 4 is an inclined surface that matches the molding inner pull-out core 5, and it is slidingly connected to the molding inner pull-out core 5; at the same time, the top of the inner pull-out guide rail 4 is connected to the pulling stroke cylinder 2 through the connecting block A3, and the pulling stroke cylinder 2 drives the inner pull-out guide rail 4 and the molding inner pull-out core 5 to move.

[0007] The mold locking cylinder 6 is installed on the mold through the fixing block 7, and the mold locking cylinder 6, the connecting block B8, the fixing plate 9 and the locking module 10 are connected in sequence; the locking module 10 is a wedge-shaped structure, which is inserted into the wedge-shaped hole on the side of the inner pull-out guide rail 4, and moves in the inner pull-out guide rail 4 under the drive of the mold locking cylinder 6 to realize the locking and unlocking of the inner pull-out guide rail 4.

[0008] Furthermore, a T-shaped groove is provided on the inclined surface of the forming inner-drawing core 5, and a T-shaped protrusion is provided on the inclined surface of the inner-drawing guide rail 4, which is connected with the T-shaped groove of the forming inner-drawing core 5 through the T-shaped protrusion.

[0009] Furthermore, the wedge angle between the lock module 10 and the horizontal plane is 3°.

[0010] Furthermore, there are two locking modules 10 , which are symmetrically connected to the fixing plate 9 .

[0011] Furthermore, the twitching stroke cylinder 2 is provided with a limit switch A13; and the clamping cylinder 6 is provided with a limit switch B14.

[0012] Furthermore, the surface of the forming inner draw core 5 and the outer side surface of the inner draw guide rail 4 are both provided with wear-resistant plates.

[0013] After the injection molding and pressure holding of the injection molding machine are completed, the locking cylinder 6, under the control of the limit switch B14, pulls the locking module 10 out of the inner pull-out guide rail 4 through the connecting block B8 and the fixing plate 9, and releases the inner pull-out guide rail 4 from the locked state; then, the stroke cylinder 2 drives the inner pull-out guide rail 4 to move upward under the control of the limit switch A13, and then drives the forming inner pull-out core 5 to move along the normal direction of the T-slot through the T-slot matched between the inner pull-out guide rail 4 and the forming inner pull-out core 5, and pulls the forming inner pull-out core 5 out of the product undercut structure. At this time, the mold has no undercut interference structure in the mold opening direction, and the mold can be opened smoothly.

[0014] The beneficial effects of the utility model are as follows: the utility model adds a side clamping structure to disperse the clamping pressure required for large-area core pulling to the core pulling cylinder and the side clamping structure respectively, thereby reducing the cylinder pressure required to drive the inner pulling structure, reducing the cylinder specifications and floor space required for the inner pulling mechanism at the undercut of the product, reducing the overall dimensions and height of the mold, and reducing the cost required for the mold and injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the decomposition of the internal core pressure.

[0017] Figure 3 This is a schematic diagram of the side clamping cylinder pressure calculation.

[0018] In the figure: 1 product; 2 twitching stroke cylinder; 3 connecting block A; 4 inner pull-out guide rail; 5 forming inner pull-out core; 6 clamping cylinder; 7 fixing block; 8 connecting block B; 9 fixing plate; 10 locking module; 11 wear-resistant plate A; 12 wear-resistant plate B; 13 limit switch A; 14 limit switch B. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the specific implementation methods of the utility model will be described in detail below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, this embodiment provides a large-area cylinder core-pulling clamping mechanism, including a pulling stroke cylinder 2, a connecting block A3, an internal pulling guide rail 4, a forming internal pulling core 5, a clamping cylinder 6, a fixed block 7, a connecting block B8, a fixed plate 9, a locking module 10, a wear-resistant plate and a limit switch.

[0021] One end of the forming inner pull-out core 5 is the forming surface of the undercut part of the product 1, and the other end surface is an inclined surface with a T-shaped groove on the inclined surface; the side surface of the inner pull-out guide rail 4 is an inclined surface matching the forming inner pull-out core 5, and is provided with a T-shaped protrusion, which is connected to the T-shaped groove of the forming inner pull-out core 5 through the T-shaped protrusion; at the same time, the top of the inner pull-out guide rail 4 is connected to the piston rod of the pumping stroke cylinder 2 through the connecting block A3, and the pumping stroke cylinder 2 is provided with a limit switch A13, and the pumping stroke cylinder 2 is controlled by the limit switch A13 to drive the inner pull-out guide rail 4 and the forming inner pull-out core 5 to move.

[0022] The mold locking oil cylinder 6 is installed on the mold through the fixing block 7, and a limit switch B14 is provided on the mold locking oil cylinder 6. A through hole is provided in the middle of the fixing block 7, and the piston rod of the mold locking oil cylinder 6 passes through the through hole and is connected with the connecting block B8, the fixing plate 9 and the two locking modules 10 in sequence; the locking module 10 is a wedge-shaped structure, and the wedge angle between it and the horizontal plane is 3°. The locking module 10 is inserted into the wedge-shaped hole on the side of the inner drawer guide rail 4, and moves in the inner drawer guide rail 4 under the drive of the mold locking oil cylinder 6 to achieve the locking and unlocking of the inner drawer guide rail 4.

[0023] The surface of the forming inner-drawing core 5 is provided with a wear-resistant plate A11; the outer side surface of the inner-drawing guide rail 4 is provided with a wear-resistant plate B12.

[0024] Figure 2 This is a schematic diagram of the decomposition of the inner core pressure. The pressure calculation of the inner core structure driven by the conventional oil cylinder is as follows:

[0025] It is known that the projection area of ​​the inner core in its moving direction is 182cm 2, Resin pressure parameters: Acrylonitrile-butadiene-styrene copolymer / fatty alcohol polyoxyethylene ether sulfate (ABS / AES): 400kg / cm 2 , the pressure safety factor is 0.8. At this time, the clamping pressure of the inner core is:

[0026] F=182*400 / 0.8=82900kg(82.9ton);

[0027] According to the pressure decomposition, the cylinder bears the pressure F1 = F*sin25° = 35ton.

[0028] The largest model of commonly used oil cylinders has an inner diameter of 250mm and a pressure of 24.5 tons. If this structure is used, a larger diameter oil cylinder needs to be customized. This not only takes up a lot of space, but also requires increasing the mold size, and the cost of custom-made oil cylinders is too high.

[0029] like Figure 3 As shown, the pressure calculation of the core pulling structure of the side-added cylinder clamping mechanism is as follows:

[0030] A 3° wedge lock module linked by a cylinder is added to the side. The pressure on the 3° clamping surface is f≈F1=35ton. According to the pressure decomposition, the pressure on the cylinder in the running direction is:

[0031] f2=f*sin3°=1.83ton.

[0032] According to the cylinder pressure, it is recommended to choose a cylinder with an inner diameter of 80mm; and the pumping stroke cylinder only needs to bear the weight of the inner pumping core and the inner pumping guide rail itself.

[0033] The above-mentioned clamping mechanism can be composed of two small-sized conventional cylinders working in conjunction to replace one oversized cylinder to achieve the purpose of core pulling, which not only saves space but also avoids the customization period and cost of custom-made large-diameter cylinders.

[0034] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and concept of the utility model within the technical scope disclosed by the utility model, which should be covered by the protection scope of the utility model.

Claims

1. A large area cylinder core-pulling clamping mechanism, It is characterized in that The mold locking mechanism comprises a pumping stroke oil cylinder (2), an inner pumping guide rail (4), a forming inner pumping core (5), a mold locking oil cylinder (6) and a locking module (10); One end of the molding inner-drawing core (5) is a molding surface of the undercut part of the product, and the other end surface is an inclined surface; the side surface of the inner-drawing guide rail (4) is an inclined surface that matches the molding inner-drawing core (5), and is slidably connected to the molding inner-drawing core (5); at the same time, the top of the inner-drawing guide rail (4) is connected to the pumping stroke cylinder (2), and the pumping stroke cylinder (2) drives the inner-drawing guide rail (4) and the molding inner-drawing core (5) to move; The mold locking oil cylinder (6) is installed on the mold, and the mold locking oil cylinder (6) is connected to a locking module (10); the locking module (10) is a wedge-shaped structure, which is inserted into a wedge-shaped hole on the side of the inner pull-out guide rail (4) and moves in the inner pull-out guide rail (4) under the drive of the mold locking oil cylinder (6) to achieve locking and unlocking of the inner pull-out guide rail (4).

2. A large-area oil cylinder core-pulling clamping mechanism according to claim 1, It is characterized in that The inclined surface of the forming inner-drawing core (5) is provided with a T-shaped groove; the inclined surface of the inner-drawing guide rail (4) is provided with a T-shaped protrusion, which is matched and connected with the T-shaped groove of the forming inner-drawing core (5).

3. A large-area oil cylinder core-pulling clamping mechanism according to claim 1 or 2, It is characterized in that The wedge angle between the lock module (10) and the horizontal plane is 3°.

4. A large-area oil cylinder core-pulling clamping mechanism according to claim 1 or 2, It is characterized in that The mold locking oil cylinder (6) is installed on the mold through a fixing block (7); a through hole is provided in the middle of the fixing block (7), and the piston rod of the mold locking oil cylinder (6) passes through the through hole and is connected to the connecting block B (8), the fixing plate (9), and the locking module (10) in sequence.

5. According to claim 3, a large-area oil cylinder core-pulling clamping mechanism, It is characterized in that The mold locking oil cylinder (6) is installed on the mold through a fixing block (7); a through hole is provided in the middle of the fixing block (7), and the piston rod of the mold locking oil cylinder (6) passes through the through hole and is connected to the connecting block B (8), the fixing plate (9), and the locking module (10) in sequence.

6. A large-area oil cylinder core-pulling clamping mechanism according to claim 1, 2 or 5, It is characterized in that The inner pull-out guide rail (4) is connected to the pull-out stroke oil cylinder (2) via a connecting block A (3).

7. A large-area oil cylinder core-pulling clamping mechanism according to claim 1, 2 or 5, It is characterized in that There are two lock modules (10) in total.

8. A large-area oil cylinder core-pulling clamping mechanism according to claim 1, 2 or 5, It is characterized in that The pumping stroke oil cylinder (2) and the mold locking oil cylinder (6) are both provided with limit switches.

9. A large-area oil cylinder core-pulling clamping mechanism according to claim 6, It is characterized in that The pumping stroke oil cylinder (2) and the mold locking oil cylinder (6) are both provided with limit switches.

10. A large-area oil cylinder core-pulling clamping mechanism according to claim 1, 2, 5 or 9, It is characterized in that The surface of the forming inner-drawing core (5) and the outer side surface of the inner-drawing guide rail (4) are both provided with wear-resistant plates.

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