Split type die cavity bottom and die cavity structure

Abstract

A split type mold cavity bottom and a mold cavity structure belong to the technical field of bottle blank molds, and comprise a mold cavity bottom body and a mold cavity bottom water retaining ring, the die cavity bottom body comprises a first section, a transition section and a second section which are sequentially arranged along the axis, the diameter of the first section is smaller than that of the second section, and the maximum diameter of the transition section is smaller than that of the first section; the cooling water channel at the bottom of the die cavity is formed by a channel formed by separating the inner hole of the water retaining ring and the transition section, and only the transition section needs to be machined on the outer wall of the body of the die cavity bottom and the inner ring of the water retaining hole needs to be machined in the water retaining ring of the die cavity bottom, so that the machining difficulty is greatly reduced, and the cross sectional area of the formed cooling water channel is increased and is equal; therefore, all positions of the bottom of the die cavity are cooled uniformly, the cooling range covered by the cooling water channel is enlarged, and a better cooling effect is provided.

Description

Technical Field

[0001] The utility model belongs to the technical field of preform molds, and particularly relates to a split mold cavity bottom and a mold cavity structure. Background Art

[0002] In a preform mold, the mold cavity structure is used to define the injection molding of the preform. In order to ensure that the preform mold can be quickly cooled and solidified during the injection molding process of the preform, cooling water channels are arranged in the mold cavity structure.

[0003] The existing preform mold structure can refer to the Chinese utility model patent with the patent application number 201720166000.8 and the patent name of a double independent cooling water channel structure of a multi-cavity preform injection mold. It discloses a mold body with a mold cavity and a mold body insert arranged on the mold body. A gate communicating with the mold cavity is arranged on the mold body insert. A first spiral water groove and a second spiral water groove with their tops communicating are arranged on the outer peripheral surface of the mold body. The other ends of the first spiral water groove and the second spiral water groove are respectively used as a first water inlet and a first water outlet. A plurality of fan-shaped grooves are arranged on the outer peripheral surface of the mold body insert. The mold body insert is provided with a plurality of through holes communicating all the fan-shaped grooves. The mold body insert is provided with a water channel around the gate. The water channel is provided with an opening for communicating it with the fan-shaped grooves. A second water inlet and a second water outlet both communicating with the fan-shaped grooves are arranged on the mold body. For the processing of the through holes and water channels in the mold body insert, it needs to be carried out by means of deep drilling. The processing difficulty is relatively high, and the formed cooling channels are relatively small, with a limited cooling range for the bottom of the preform and poor cooling effect. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a split mold cavity bottom.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A split mold cavity bottom includes a mold cavity bottom body and a mold cavity bottom water retaining ring. The mold cavity bottom body includes a first section, a transition section, and a second section arranged in sequence along the axis. The diameter of the first section is smaller than that of the second section, and the maximum diameter of the transition section is smaller than that of the first section. The mold cavity bottom water retaining ring has a water retaining ring inner hole penetrating along the axis. The mold cavity bottom water retaining ring is sleeved outside the first section and the transition section. The end face II of the mold cavity bottom water retaining ring abuts against the first end face of the second section. The outer wall of the first section is in interference fit with the water retaining ring inner hole. A cooling water channel of the mold cavity bottom is formed between the water retaining ring inner hole and the transition section.

[0007] In the utility model, the inner hole of the water retaining ring includes a first hole segment and a second hole segment in sequence from the end face I to the end face II of the water retaining ring at the bottom of the mold cavity, the first hole segment corresponds to the position of the first segment and the diameter of the first hole segment is adapted to the diameter of the first segment, the second hole segment corresponds to the position of the transition segment and the diameter of the second hole segment is greater than or equal to the diameter of the first hole segment.

[0008] In the utility model, the outer wall of the second section has a first recess and a second recess that are opposite to each other along the circumferential direction, and the first recess and the second recess both penetrate the first end face of the second section along the axial direction; the outer wall of the water retaining ring at the bottom of the mold cavity has a third recess and a fourth recess that are opposite to each other along the circumferential direction, and the third recess and the first recess are connected and combined to form the water inlet level of the bottom of the mold cavity, and the fourth recess and the second recess are connected and combined to form the water outlet level of the bottom of the mold cavity.

[0009] In the present invention, the third recess axially penetrates the end surface I and the end surface II of the mold cavity bottom water retaining ring, and the fourth recess axially penetrates the end surface II of the mold cavity bottom water retaining ring;

[0010] Alternatively, the third recess only penetrates the end surface II of the mold cavity bottom water retaining ring along the axial direction, and the fourth recess penetrates the end surface II of the mold cavity bottom water retaining ring along the axial direction.

[0011] In the utility model, the end face II of the mold cavity bottom water retaining ring has a first recess and a second recess that are circumferentially and opposite to each other, the first recess radially penetrates the third recess and the inner wall of the mold cavity bottom water retaining ring, and the second recess radially penetrates the fourth recess and the inner wall of the mold cavity bottom water retaining ring; a water channel inlet of the cooling water channel is formed between the first recess and the end face II of the mold cavity bottom water retaining ring, and a water channel outlet of the cooling water channel is formed between the second recess and the end face II of the mold cavity bottom water retaining ring; the water inlet level is connected to the cooling water channel through the water channel inlet, and the water outlet level is connected to the cooling water channel through the water channel outlet.

[0012] In the utility model, a raised first water retaining rib is provided in the first depression, and a raised second water retaining rib is provided in the second depression. The raised surfaces of the first water retaining rib and the second water retaining rib are flush with the end surface II of the cavity bottom water retaining ring.

[0013] In the utility model, a first pin hole is provided on the first end face of the second section, and a second pin hole is provided on the end face II of the mold cavity bottom water retaining ring. Based on the cooperation between the positioning pin and the first pin hole and the second pin hole, the installation angle of the mold cavity bottom water retaining ring is limited, so that the third recess corresponds to the first recess, and the fourth recess corresponds to the second recess.

[0014] In the present utility model, the arc lengths of the third recess and the fourth recess are equal, the arc lengths of the first recess and the second recess are equal, and the arc lengths of the third recess and the fourth recess are respectively greater than the arc lengths of the first recess and the second recess.

[0015] In the present utility model, the first section is a first cylindrical section, the second section is a second cylindrical section, the transition section is a frustum section, and the diameter of the frustum section gradually decreases in the direction from the first cylindrical section to the second cylindrical section.

[0016] Based on the provided split mold cavity bottom, the present utility model further provides a mold cavity structure, including a mold cavity and the above-mentioned split mold cavity bottom. The mold cavity is connected to the mold cavity bottom body by means of clamping; a cooling water groove is provided on the outer peripheral surface of the mold cavity, and the water outlet of the cooling water groove is communicated with the water inlet position of the mold cavity bottom, or the cooling water groove and the cooling water channel of the mold cavity bottom are independent of each other.

[0017] The beneficial effects of the present utility model are as follows: The cooling water channel of the mold cavity bottom is formed by the channel formed by the inner hole of the water retaining ring and the transition section. It only needs to process the transition section on the outer wall of the mold cavity bottom body and process the inner circle of the water retaining hole in the water retaining ring of the mold cavity bottom, greatly reducing the processing difficulty. Moreover, the cross-sectional area of the formed cooling water channel is increased and made equal, so that the cooling of each position of the mold cavity bottom is uniform, increasing the cooling range covered by the cooling water channel and providing a better cooling effect. Description of the Drawings

[0018] Figure 1 Front structural schematic diagram of the split mold cavity bottom of Embodiment 1;

[0019] Figure 2 Back structural schematic diagram of the split mold cavity bottom of Embodiment 1;

[0020] Figure 3 Exploded view of the split mold cavity bottom of Embodiment 1;

[0021] Figure 4 Cross-sectional structural schematic diagram of the split mold cavity bottom of Embodiment 1;

[0022] Figure 5 Cross-sectional structural schematic diagram of the mold cavity bottom body of Embodiment 1;

[0023] Figure 6 Cross-sectional structural schematic diagram of the water retaining ring of the mold cavity bottom of Embodiment 1;

[0024] Figure 7 Structural schematic diagram of end face II of the water retaining ring of the mold cavity bottom of Embodiment 1;

[0025] Figure 8Exploded view of the cavity structure of Embodiment 1;

[0026] Figure 9 Top view of the cavity of Embodiment 1;

[0027] Figure 10 Front structural schematic diagram of the split cavity bottom of Embodiment 2. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present utility model, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model. Embodiment 1

[0031] As Figures 1 to 9 shown, this embodiment discloses a split cavity bottom, including a cavity bottom body 1 and a cavity bottom water retaining ring 2. The cavity bottom body 1 includes a first section 11, a transition section 12, and a second section 13 arranged in sequence along the axis. The diameter of the first section 11 is smaller than that of the second section 13, and the maximum diameter of the transition section 12 is smaller than that of the first section 11. The outer wall of the second section 13 has first recesses 131 and second recesses 132 that are circumferentially opposite to each other, and both the first recesses 131 and the second recesses 132 axially penetrate the first end face 133 of the second section 13, where the first end face 133 of the second section 13 is the end face of the second section 13 facing the transition section 12 and the first section 11. In addition, a cavity buckling section 14, a cavity bottom forming area 15, a pouring channel 16, and a cavity injection section 17 are sequentially arranged inside the cavity bottom body 1 along the axis.

[0032] In this embodiment, the water retaining ring 2 at the bottom of the mold cavity is sleeved outside the first section 11 and the transition section 12. The water retaining ring 2 at the bottom of the mold cavity has end faces Ⅰ 21 and Ⅱ 22 arranged oppositely along the axis. The end face Ⅱ 22 of the water retaining ring 2 at the bottom of the mold cavity abuts against the first end face 133 of the second section 13. A cooling water channel 5 at the bottom of the mold cavity is formed between the inner hole 23 of the water retaining ring and the transition section 12.

[0033] The water retaining ring 2 at the bottom of the mold cavity has an inner hole 23 of the water retaining ring that penetrates along the axis. The inner hole 23 of the water retaining ring includes a first hole section 231 and a second hole section 232 in sequence from the direction of the end face Ⅰ 21 to the end face Ⅱ 22. The first hole section 231 corresponds to the position of the first section 11 and the diameter of the first hole section 231 is adapted to the diameter of the first section 11. The second hole section 232 corresponds to the position of the transition section 12 and the diameter of the second hole section 232 is greater than or equal to the diameter of the first hole section 231. That is, when it is necessary to increase the cross-sectional area of the cooling water channel 5 at the bottom of the mold cavity, it can be achieved by increasing the aperture of the second hole section 232 and / or reducing the diameter of the transition section 12. Preferably, the length of the first hole section 231 is greater than the length of the first section 11, and the outer wall of the first section 11 is in interference fit with the first hole section 231. The diameter of the second hole section 232 is slightly larger than the diameter of the first hole section 231, which is convenient for sleeving the water retaining ring 2 at the bottom of the mold cavity.

[0034] In this embodiment, the outer wall of the water retaining ring 2 at the bottom of the mold cavity has third recesses 24 and fourth recesses 25 that are circumferentially opposite. The third recess 24 penetrates the end face Ⅰ 21 and the end face Ⅱ 22 of the water retaining ring 2 at the bottom of the mold cavity along the axis. The fourth recess 25 penetrates the end face Ⅱ 22 of the water retaining ring 2 at the bottom of the mold cavity along the axis. The end face Ⅱ 22 of the water retaining ring 2 at the bottom of the mold cavity has first depressions 26 and second depressions 27 that are circumferentially opposite. The first depression 26 penetrates the third recess 24 and the inner wall of the water retaining ring 2 at the bottom of the mold cavity along the radial direction. The second depression 27 penetrates the fourth recess 25 and the inner wall of the water retaining ring 2 at the bottom of the mold cavity along the radial direction. The third recess 24 and the first recess 131 are aligned and communicated to form the water inlet level 3 at the bottom of the mold cavity. The fourth recess 25 and the second recess 132 are aligned and communicated to form the water outlet level 4 at the bottom of the mold cavity. The outer wall of the first section 11 is in interference fit with the inner hole 23 of the water retaining ring. A water channel inlet 6 of the cooling water channel 5 is formed between the first depression 26 and the end face Ⅱ 22 of the water retaining ring 2 at the bottom of the mold cavity. A water channel outlet 7 of the cooling water channel 5 is formed between the second depression 27 and the end face Ⅱ 22 of the water retaining ring 2 at the bottom of the mold cavity. The water inlet level 3 is communicated with the cooling water channel 5 through the water channel inlet 6, and the water outlet level 4 is communicated with the cooling water channel 5 through the water channel outlet 7.

[0035] In this embodiment, the cooling water channel 5 at the bottom of the cavity is formed by the channel separated by the inner hole 23 of the water retaining ring and the transition section 12. It only needs to machine the transition section 12 on the outer wall of the cavity bottom body 1 and machine the inner ring of the water retaining hole in the cavity bottom water retaining ring 2, greatly reducing the processing difficulty. Moreover, the cross-sectional areas of the formed cooling water channels 5 are equal, so that the cooling of each position at the bottom of the cavity is uniform, and the cooling range covered by the cooling water channels 5 is increased.

[0036] Specifically, the first section 11 is a first cylindrical section, the second section 13 is a second cylindrical section, and the transition section 12 is a frustum section. The diameter of the frustum section gradually decreases in the direction from the first cylindrical section to the second cylindrical section.

[0037] Specifically, a raised first water retaining rib 28 is provided in the first recess 26, and a raised second water retaining rib 29 is provided in the second recess 27. The raised surfaces of the first water retaining rib 28 and the second water retaining rib 29 are flush with the end face II 22 of the cavity bottom water retaining ring 2. After the cavity bottom body 1 and the cavity bottom water retaining ring 2 are installed, both the first water retaining rib 28 and the second water retaining rib 29 abut against the first end face 133 of the second section 13, which is used to divide the cooling water flow.

[0038] Specifically, a first pin hole 1331 is provided on the first end face 133 of the second section 13, and a second pin hole 221 is provided on the end face II 22 of the cavity bottom water retaining ring 2. Based on the cooperation of the positioning pin with the first pin hole 1331 and the second pin hole 221, the installation angle of the cavity bottom water retaining ring 2 is limited, so that the third recess 24 corresponds to the first recess 131, and the fourth recess 25 corresponds to the second recess 132.

[0039] Preferably, the arc lengths of the third recess 24 and the fourth recess 25 are equal, and the arc lengths of the first recess 131 and the second recess 132 are equal. The arc lengths of the third recess 24 and the fourth recess 25 are slightly larger than the arc lengths of the first recess 131 and the second recess 132, so that the cooling water flowing through the third recess 24 and the fourth recess 25 can completely cover the areas of the first recess 131 and the second recess 132, so that the cooling water in the first recess 131 and the second recess 132 is in a flowing state and can participate in the cooling cycle, avoiding the generation of flow dead zones in the first recess 131 or the second recess 132, resulting in part of the cooling water being trapped in the flow dead zones of the first recess 131 or the second recess 132 and not flowing.

[0040] Based on the above-disclosed split cavity bottom, this embodiment also discloses a cavity structure, including a cavity 8 and the above split cavity bottom. The cavity 8 is connected to the cavity bottom body 1 by a clamping method. The specific clamping method is that the lower end of the cavity 8 is inserted into the cavity clamping section 14; a cooling water groove 81 is provided on the outer peripheral surface of the cavity 8, and the water outlet 811 of the cooling water groove 81 is communicated with the water inlet position 3 of the cavity bottom.

[0041] In this embodiment, the cooling water flows through successively: water tank inlet 812 → cooling water tank 81 → water tank outlet 811 → water inlet level 3 at the bottom of the mold cavity → waterway inlet 6 → cooling waterway 5 → waterway outlet 7 → water outlet level 4 at the bottom of the mold cavity. Embodiment 2

[0042] The specific implementation content of this embodiment is substantially the same as that of Embodiment 1, and the difference is that: as Figure 10 shown, the third recess 24 of the water retaining ring 2 at the bottom of the mold cavity only penetrates axially through the end face II 22 of the water retaining ring 2 at the bottom of the mold cavity. In this way, the cooling water path of the split mold cavity bottom is independent of the cooling water path of the mold cavity 8. For the split mold cavity bottom, the cooling water flows through successively: water inlet level 3 at the bottom of the mold cavity → waterway inlet 6 → cooling waterway 5 → waterway outlet 7 → water outlet level 4 at the bottom of the mold cavity.

[0043] For the mold cavity 8, the cooling water flows through successively: water tank inlet 812 → cooling water tank 81 → water tank outlet 811. The water tank outlet 811 of the mold cavity 8 is separated from the water inlet level 3 at the bottom of the mold cavity.

[0044] The above are only the preferred embodiments of the present invention. As long as the technical solutions that achieve the purpose of the present invention by substantially the same means fall within the protection scope of the present invention.

Claims

1. A split cavity bottom, characterized in that: It comprises a mold cavity bottom body and a mold cavity bottom water retaining ring; the mold cavity bottom body comprises a first section, a transition section and a second section arranged in sequence along the axis, the diameter of the first section is smaller than the diameter of the second section, and the maximum diameter of the transition section is smaller than the diameter of the first section; the mold cavity bottom water retaining ring has an inner hole of the water retaining ring penetrating along the axis; the mold cavity bottom water retaining ring is sleeved on the outside of the first section and the transition section, the end face II of the mold cavity bottom water retaining ring abuts against the first end face of the second section, the outer wall of the first section is interference fit with the inner hole of the water retaining ring, and a cooling water channel of the mold cavity bottom is formed between the inner hole of the water retaining ring and the transition section.

2. The split cavity bottom according to claim 1, characterized in that: The inner hole of the water retaining ring includes a first hole segment and a second hole segment in sequence from the end face I to the end face II of the water retaining ring at the bottom of the mold cavity. The first hole segment corresponds to the position of the first segment and the diameter of the first hole segment is adapted to the diameter of the first segment. The second hole segment corresponds to the position of the transition segment and the diameter of the second hole segment is greater than or equal to the diameter of the first hole segment.

3. The split cavity bottom according to claim 1, characterized in that: The outer wall of the second section has a first recess and a second recess that are opposite to each other along the circumferential direction, and the first recess and the second recess both penetrate the first end face of the second section along the axial direction; the outer wall of the water retaining ring at the bottom of the mold cavity has a third recess and a fourth recess that are opposite to each other along the circumferential direction, and the third recess and the first recess are connected and combined to form a water inlet level of the bottom of the mold cavity, and the fourth recess and the second recess are connected and combined to form a water outlet level of the bottom of the mold cavity.

4. The split cavity bottom according to claim 3, characterized in that: The third recess axially penetrates the end surface I and the end surface II of the mold cavity bottom water retaining ring, and the fourth recess axially penetrates the end surface II of the mold cavity bottom water retaining ring; Alternatively, the third recess only penetrates the end surface II of the mold cavity bottom water retaining ring along the axial direction, and the fourth recess penetrates the end surface II of the mold cavity bottom water retaining ring along the axial direction.

5. The split cavity bottom according to claim 3, characterized in that: The end face II of the mold cavity bottom water retaining ring has a first recess and a second recess that are circumferentially and opposite to each other, the first recess radially penetrates the third recess and the inner wall of the mold cavity bottom water retaining ring, and the second recess radially penetrates the fourth recess and the inner wall of the mold cavity bottom water retaining ring; a water channel inlet of the cooling water channel is formed between the first recess and the end face II of the mold cavity bottom water retaining ring, and a water channel outlet of the cooling water channel is formed between the second recess and the end face II of the mold cavity bottom water retaining ring; the water inlet level is connected to the cooling water channel through the water channel inlet, and the water outlet level is connected to the cooling water channel through the water channel outlet.

6. The split cavity bottom according to claim 5, characterized in that: A raised first water retaining rib is provided in the first depression, and a raised second water retaining rib is provided in the second depression. The raised surfaces of the first water retaining rib and the second water retaining rib are flush with the end surface II of the water retaining ring at the bottom of the mold cavity.

7. The split cavity bottom according to claim 3, characterized in that: A first pin hole is provided on the first end face of the second section, and a second pin hole is provided on the end face II of the mold cavity bottom water retaining ring. Based on the cooperation between the positioning pin and the first pin hole and the second pin hole, the installation angle of the mold cavity bottom water retaining ring is limited, so that the third recess corresponds to the first recess, and the fourth recess corresponds to the second recess.

8. The split cavity bottom according to claim 3, characterized in that: The arc lengths of the third concave and the fourth concave are equal, the arc lengths of the first concave and the second concave are equal, and the arc lengths of the third concave and the fourth concave are respectively greater than the arc lengths of the first concave and the second concave.

9. The split mold cavity bottom according to claim 1, characterized in that: The first section is a first cylindrical section, the second section is a second cylindrical section, the transition section is a truncated cone section, and the diameter of the truncated cone section gradually decreases from the first cylindrical section to the second cylindrical section.

10. A mold cavity structure, characterized in that: It comprises a mold cavity and a split mold cavity bottom as described in any one of claims 1 to 9, wherein the mold cavity is connected to the mold cavity bottom body by crimping; a cooling water trough is provided on the outer peripheral surface of the mold cavity, and the water outlet of the cooling water trough is connected to the water inlet level of the mold cavity bottom, or the cooling water trough and the cooling water channel of the mold cavity bottom are independent of each other.

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