A helical tooth mold mechanism

Abstract

The utility model relates to mould technical field especially relates to a helical gear mould mechanism, and front mould insert is installed on front mould kernel, and is equipped with first straight toothed post on front mould insert, rear mould kernel includes the inner cylinder platform with second through hole and the base platform connected with inner cylinder platform, rear mould insert includes the cylinder with third through hole and the outer annular flap connected with cylinder, and one end of cylinder away from outer annular flap is equipped with first inner helical gear, and cylinder is rotated and is connected on inner cylinder platform through third through hole, and outer annular flap and base platform abut, and the cylinder is inserted in second through hole and slides, when front mould kernel and rear mould kernel are in the mould closing state, the model cavity for manufacturing helical gear is equipped between front mould kernel and rear mould kernel, first straight toothed post is used for manufacturing the straight toothed hole of helical gear, first inner helical gear is used for manufacturing the outer helical gear of helical gear, and the cylinder is used for the ejection of helical gear from inner cylinder platform. The helical gear mould mechanism has less spare parts, low cost, and the demoulding of helical gear is smooth, and helical gear is not easy to damage.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a helical tooth mold mechanism. Background Technology

[0002] Injection molds, as a tool for producing plastic products, can give plastic products a complete structure and precise dimensions. Due to their complex structure, helical gears are usually manufactured using injection molds.

[0003] During the process of molding helical gears using injection molds, demolding the helical gears can be challenging. The mold's structure can easily affect the rotation of the helical gears during demolding, leading to unsuccessful demolding or even damage to the helical gears. Summary of the Invention

[0004] This utility model provides a helical gear mold mechanism to solve the technical problem of unsuccessful demolding in the process of manufacturing helical gears using injection molds in the prior art.

[0005] An embodiment of this utility model provides a helical tooth mold mechanism, including a front mold core, a front mold insert, a rear mold core, a rear mold insert, and a sleeve; The front mold core is provided with a first through hole, the front mold insert is installed in the first through hole, and the front mold insert is provided with a first straight tooth post; The rear mold core includes an inner cylindrical platform with a second through hole and a base platform connected to the inner cylindrical platform; the rear mold insert includes a cylindrical body with a third through hole and an outer annular flap connected to the cylindrical body, and the end of the cylindrical body away from the outer annular flap is provided with a first internal helical tooth. The cylinder is rotatably fitted onto the inner cylindrical platform through the third through hole, and the outer annular flap abuts against the base platform; the ejector sleeve is slidably inserted into the second through hole; When the front mold core and the rear mold core are in the mold-closed state, a mold cavity for manufacturing helical gears is provided between the front mold core and the rear mold core. The first spur tooth is used to manufacture the spur tooth hole of the helical gear, the first internal helical tooth is used to manufacture the external helical tooth of the helical gear, and the ejector sleeve is used to eject the helical gear from the inner cylindrical platform.

[0006] Optionally, a first annular cooling space is provided between the front mold insert and the inner wall of the first through hole; the front mold core is also provided with a first water inlet and a first water outlet, both of which are connected to the first annular cooling space.

[0007] Optionally, the front mold insert is further provided with a first annular groove and a second annular groove distributed at intervals, and the helical tooth mold mechanism further includes a first sealing ring and a second sealing ring, the first sealing ring being sleeved in the first annular groove and the second sealing ring being sleeved in the second annular groove; both the first sealing ring and the second sealing ring abut against the inner wall of the first through hole; the first annular cooling space is located between the first sealing ring and the second sealing ring.

[0008] Optionally, the helical tooth mold mechanism further includes an inner heat-conducting sleeve, which is sleeved on the ejector sleeve and located in the second through hole; a second annular cooling space is provided between the outer wall of the inner heat-conducting sleeve and the inner wall of the second through hole; The base is also provided with a second water inlet and a second water outlet, both of which are connected to the second annular cooling space.

[0009] Optionally, the outer wall of the inner heat-conducting sleeve is further provided with a third annular groove and a fourth annular groove spaced apart. The helical tooth mold mechanism also includes a third sealing ring and a fourth sealing ring. The third sealing ring is sleeved in the third annular groove, and the fourth sealing ring is sleeved in the fourth annular groove. Both the third and fourth sealing rings abut against the inner wall of the second through hole. The second annular cooling space is located between the third and fourth sealing rings.

[0010] Optionally, the helical tooth mold mechanism further includes an outer heat-conducting sleeve and a cover with an internal space. The outer heat-conducting sleeve is rotatably sleeved on the sleeve, and the side of the outer annular flap away from the base abuts against the outer heat-conducting sleeve. The rear mold insert and the outer heat-conducting sleeve are both located in the internal space. A third annular cooling space is provided between the outer wall of the outer heat-conducting sleeve and the inner wall of the internal space. The cover is provided with a third water inlet and a third water outlet, both of which are connected to the third annular cooling space.

[0011] Optionally, the outer wall of the outer heat-conducting sleeve is further provided with a fifth annular groove and a sixth annular groove spaced apart. The helical tooth mold mechanism also includes a fifth sealing ring and a sixth sealing ring. The fifth sealing ring is fitted in the fifth annular groove, and the sixth sealing ring is fitted in the sixth annular groove. Both the fifth and sixth sealing rings abut against the inner wall of the internal space. The third annular cooling space is located between the fifth and sixth sealing rings.

[0012] Optionally, the ejector sleeve is provided with an inner through hole, and the helical tooth mold mechanism further includes an ejector sleeve insert that is slidably inserted into the inner through hole; When the front mold core and the rear mold core are in the closed state, the ejector pin abuts against the front mold insert.

[0013] In this invention, when the front mold core and the rear mold core are in the closed mold state, the bottom of the front mold core abuts against the top of the cylinder, and a mold cavity is provided between the front mold core and the rear mold core. Casting material is injected into the mold cavity, and after the casting material in the mold cavity solidifies, a helical gear can be formed in the mold cavity. The first spur tooth can form the spur tooth hole of the helical gear, and the first internal helical tooth can form the external helical tooth of the helical gear. When the front mold core and the rear mold core separate, the front mold core first drives the front mold insert away from the rear mold core, and the ejector sleeve then pushes the helical gear away from the rear mold core. Due to the meshing of the external helical tooth of the helical gear with the first internal helical tooth, the rear mold insert rotates on the rear mold core during the process of the helical gear moving away from the rear mold core, ensuring smooth separation of the helical gear from the rear mold insert. In this invention, the helical gear mold mechanism has fewer parts, lower cost, smooth demolding of the helical gear, and is less prone to damage. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the helical tooth mold mechanism in the mold-closing state according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of the helical tooth mold mechanism provided in an embodiment of the present invention when it is in the mold-closing state; Figure 3 This is a schematic diagram of the helical tooth mold mechanism in the mold splitting state according to an embodiment of the present invention; Figure 4 This is a cross-sectional view of the helical tooth mold mechanism provided in an embodiment of the present invention when it is in the mold parting state; Figure 5 This is a schematic diagram of the structure of the rear mold insert provided in one embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the rear mold core provided in one embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a helical gear provided in one embodiment of the present invention.

[0016] The reference numerals in the accompanying drawings are as follows: 1. Front mold core; 11. First through hole; 2. Front mold insert; 21. First straight tooth column; 22. First annular cooling space; 23. First annular groove; 24. Second annular groove; 3. Rear mold core; 31. Inner cylindrical platform; 32. Base platform; 33. Second through hole; 34. Second water inlet hole; 35. Second water outlet hole; 4. Rear mold insert; 41. Cylinder; 42. Outer annular flap; 43. Third through hole; 44. First internal helical tooth; 5. Sleeve; 6. Mold cavity; 7. Inner heat-conducting sleeve; 71. Second annular cooling space; 72. Third annular groove; 73. Fourth annular groove; 8. Outer heat-conducting sleeve; 81. Third annular cooling space; 82. Fifth annular groove; 83. Sixth annular groove; 9. Sleeve insert; 100. Helical gear; 101. Straight tooth hole; 102. External helical tooth. Detailed Implementation

[0017] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] like Figures 1 to 7 As shown, an embodiment of the present invention provides a helical tooth mold mechanism, including a front mold core 1, a front mold insert 2, a rear mold core 3, a rear mold insert 4, and a sleeve 5; The front mold core 1 is provided with a first through hole 11, the front mold insert 2 is installed in the first through hole 11, and the front mold insert 2 is provided with a first straight tooth post 21; The rear mold core 3 includes an inner cylindrical platform 31 with a second through hole 33 and a base platform 32 connected to the inner cylindrical platform 31; the rear mold insert 4 includes a cylindrical body 41 with a third through hole 43 and an outer annular flap 42 connected to the cylindrical body 41, and a first internal helical tooth 44 is provided at one end of the cylindrical body 41 away from the outer annular flap 42. The cylindrical body 41 is rotatably sleeved on the inner cylindrical platform 31 through the third through hole 43, and the outer annular flap 42 abuts against the base platform 32; the ejector sleeve 5 is slidably inserted into the second through hole 33. When the front mold core 1 and the rear mold core 3 are in the mold-closed state, a mold cavity 6 for manufacturing helical gear 100 is provided between the front mold core 1 and the rear mold core 3. The first spur tooth 21 is used to manufacture the spur tooth hole 101 of the helical gear 100, and the first internal helical tooth 44 is used to manufacture the external helical tooth 102 of the helical gear 100. The ejector sleeve 5 is used to eject the helical gear 100 from the inner cylindrical platform 31.

[0019] The first straight tooth 21 is located below the front mold core 1; the base 32 and the inner cylindrical platform 31 are integrally formed parts; the cylinder 41 and the outer annular flap 42 are integrally formed parts.

[0020] Specifically, when the front mold core 1 and the rear mold core 3 are in the closed mold state, the bottom of the front mold core 1 abuts against the top of the cylinder 41, and a mold cavity 6 is provided between the front mold core 1 and the rear mold core 3; casting material is injected into the mold cavity 6, and after the casting material in the mold cavity 6 solidifies, a helical gear 100 can be formed in the mold cavity 6. The first spur tooth column 21 can make the spur tooth hole 101 of the helical gear 100, and the first internal helical tooth 44 can make the external helical tooth 102 of the helical gear 100. When the front mold core 1 and the rear mold core 3 separate, the front mold core 1 first drives the front mold insert 2 away from the rear mold core 3. Then, the ejector sleeve 5 pushes the helical gear 100 away from the rear mold core 3. Due to the meshing of the outer helical teeth 102 of the helical gear 100 with the first inner helical teeth 44, the rear mold insert 4 rotates on the rear mold core 3 during the process of the helical gear 100 moving away from the rear mold core 3, ensuring the smooth separation of the helical gear 100 from the rear mold insert 4. In this utility model, the helical gear mold mechanism has fewer parts, lower cost, smooth demolding of the helical gear 100, and is not easily damaged.

[0021] In one embodiment, such as Figure 2 and Figure 4 As shown, a first annular cooling space 22 is provided between the inner wall of the front mold insert 2 and the first through hole 11; the front mold core 1 is also provided with a first water inlet hole (not shown in the figure) and a first water outlet hole (not shown in the figure), and the first water inlet hole and the first water outlet hole are both connected to the first annular cooling space 22.

[0022] The first annular cooling space 22 may be a side groove provided on the front mold insert 2.

[0023] Specifically, external coolant can flow into the first annular cooling space 22 through the first water inlet hole, and after cooling the front mold insert 2 in the first annular cooling space 22, the coolant flows out through the first water outlet hole.

[0024] In this embodiment, the design of the first annular cooling space 22 improves the cooling efficiency of the front mold insert 2.

[0025] In one embodiment, such as Figure 1As shown, the front mold insert 2 is also provided with a first annular groove 23 and a second annular groove 24 spaced apart. The helical tooth mold mechanism also includes a first sealing ring (not shown in the figure) and a second sealing ring (not shown in the figure). The first sealing ring is fitted in the first annular groove 23, and the second sealing ring is fitted in the second annular groove 24. Both the first sealing ring and the second sealing ring abut against the inner wall of the first through hole 11. The first annular cooling space 22 is located between the first sealing ring and the second sealing ring.

[0026] The first sealing ring is located above the first annular cooling space 22, and the second sealing ring is located below the first annular cooling space 22.

[0027] In this embodiment, the first sealing ring and the second sealing ring can prevent the coolant in the first annular cooling space 22 from leaking.

[0028] In one embodiment, such as Figure 2 and Figure 4 As shown, the helical tooth mold mechanism also includes an inner heat-conducting sleeve 7, which is sleeved on the ejector sleeve 5 and located in the second through hole 33; a second annular cooling space 71 is provided between the outer wall of the inner heat-conducting sleeve 7 and the inner wall of the second through hole 33. The base 32 is also provided with a second water inlet 34 and a second water outlet 35, both of which are connected to the second annular cooling space 71.

[0029] The inner heat-conducting sleeve 7 can be made of a material with good thermal conductivity, and the inner heat-conducting sleeve 7 is fixed in the second through hole 33.

[0030] Specifically, external coolant can flow into the second annular cooling space 71 through the second inlet hole 34, and after cooling the sleeve 5 in the second annular cooling space 71, the coolant flows out through the second outlet hole 35.

[0031] In this embodiment, the design of the second annular cooling space 71 improves the cooling efficiency of the sleeve 5.

[0032] In one embodiment, such as Figure 2 and Figure 4As shown, the outer wall of the inner heat-conducting sleeve 7 is also provided with a third annular groove 72 and a fourth annular groove 73 spaced apart. The helical tooth mold mechanism also includes a third sealing ring (not shown in the figure) and a fourth sealing ring (not shown in the figure). The third sealing ring is sleeved in the third annular groove 72, and the fourth sealing ring is sleeved in the fourth annular groove 73. Both the third sealing ring and the fourth sealing ring abut against the inner wall of the second through hole 33. The second annular cooling space 71 is located between the third sealing ring and the fourth sealing ring.

[0033] The third sealing ring is located above the second annular cooling space 71, and the fourth sealing ring is located below the second annular cooling space 71.

[0034] In this embodiment, the third and fourth sealing rings can prevent the coolant in the second annular cooling space 71 from leaking.

[0035] In one embodiment, such as Figure 1 and Figure 3 As shown, the helical tooth mold mechanism also includes an outer heat-conducting sleeve 8 and a cover (not shown in the figure) with an internal space. The outer heat-conducting sleeve 8 is rotatably sleeved on the cylinder 41. The outer annular flap 42 abuts against the outer heat-conducting sleeve 8 on the side away from the base 32. The rear mold insert 4 and the outer heat-conducting sleeve 8 are both located in the internal space. A third annular cooling space 81 is provided between the outer wall of the outer heat-conducting sleeve 8 and the inner wall of the internal space. The cover is provided with a third water inlet (not shown in the figure) and a third water outlet (not shown in the figure). The third water inlet and the third water outlet are both connected to the third annular cooling space 81.

[0036] The third annular cooling space 81 can be an annular groove provided on the outer wall of the outer heat-conducting sleeve 8, and the opening of the annular groove can facilitate contact with the inner wall of the cover.

[0037] Specifically, external coolant can flow into the third annular cooling space 81 through the third water inlet hole, and the coolant cools the rear mold insert 4 in the third annular cooling space 81 before flowing out through the third water outlet hole.

[0038] In this embodiment, the design of the third annular cooling space 81 improves the cooling efficiency of the rear mold insert 4.

[0039] In one embodiment, such as Figure 1 and Figure 3As shown, the outer wall of the outer heat-conducting sleeve 8 is also provided with a fifth annular groove 82 and a sixth annular groove 83 spaced apart. The helical tooth mold mechanism also includes a fifth sealing ring (not shown in the figure) and a sixth sealing ring (not shown in the figure). The fifth sealing ring is fitted in the fifth annular groove 82, and the sixth sealing ring is fitted in the sixth annular groove 83. Both the fifth sealing ring and the sixth sealing ring abut against the inner wall of the internal space. The third annular cooling space 81 is located between the fifth sealing ring and the sixth sealing ring.

[0040] The fifth sealing ring is located above the third annular cooling space 81, and the sixth sealing ring is located below the third annular cooling space 81.

[0041] In this embodiment, the fifth and sixth sealing rings can prevent the coolant in the third annular cooling space 81 from leaking.

[0042] In one embodiment, such as Figures 1 to 4 As shown, the sleeve 5 has an inner through hole, and the helical tooth mold mechanism also includes a sleeve insert 9 that is slidably inserted into the inner through hole; When the front mold core 1 and the rear mold core 3 are in the closed state, the sleeve insert 9 abuts against the front mold insert 2.

[0043] The sleeve insert 9 abuts against the front mold insert 2, thereby the sleeve insert 9 and the front mold insert 2 can form the straight tooth hole 101 on the helical gear 100, and the straight tooth hole 101 penetrates the helical gear 10.

[0044] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A helical gear mold mechanism, characterized in that, This includes the front mold core, front mold insert, rear mold core, rear mold insert, and ejector sleeve; The front mold core is provided with a first through hole, the front mold insert is installed in the first through hole, and the front mold insert is provided with a first straight tooth post; The rear mold core includes an inner cylindrical platform with a second through hole and a base platform connected to the inner cylindrical platform; the rear mold insert includes a cylindrical body with a third through hole and an outer annular flap connected to the cylindrical body, and the end of the cylindrical body away from the outer annular flap is provided with a first internal helical tooth. The cylinder is rotatably fitted onto the inner cylindrical platform through the third through hole, and the outer annular flap abuts against the base platform; the ejector sleeve is slidably inserted into the second through hole; When the front mold core and the rear mold core are in the mold-closed state, a mold cavity for manufacturing helical gears is provided between the front mold core and the rear mold core. The first spur tooth is used to manufacture the spur tooth hole of the helical gear, the first internal helical tooth is used to manufacture the external helical tooth of the helical gear, and the ejector sleeve is used to eject the helical gear from the inner cylindrical platform.

2. The helical gear mold mechanism according to claim 1, characterized in that, A first annular cooling space is provided between the front mold insert and the inner wall of the first through hole; the front mold core is also provided with a first water inlet and a first water outlet, both of which are connected to the first annular cooling space.

3. The helical gear mold mechanism according to claim 2, characterized in that, The front mold insert is further provided with a first annular groove and a second annular groove spaced apart. The helical tooth mold mechanism also includes a first sealing ring and a second sealing ring. The first sealing ring is fitted into the first annular groove, and the second sealing ring is fitted into the second annular groove. Both the first sealing ring and the second sealing ring abut against the inner wall of the first through hole. The first annular cooling space is located between the first sealing ring and the second sealing ring.

4. The helical gear mold mechanism according to claim 1, characterized in that, The helical tooth mold mechanism further includes an inner heat-conducting sleeve, which is sleeved on the ejector sleeve and located in the second through hole; a second annular cooling space is provided between the outer wall of the inner heat-conducting sleeve and the inner wall of the second through hole; The base is also provided with a second water inlet and a second water outlet, both of which are connected to the second annular cooling space.

5. The helical gear mold mechanism according to claim 4, characterized in that, The outer wall of the inner heat-conducting sleeve is also provided with a third annular groove and a fourth annular groove distributed at intervals. The helical tooth mold mechanism also includes a third sealing ring and a fourth sealing ring. The third sealing ring is sleeved in the third annular groove, and the fourth sealing ring is sleeved in the fourth annular groove. Both the third sealing ring and the fourth sealing ring abut against the inner wall of the second through hole. The second annular cooling space is located between the third sealing ring and the fourth sealing ring.

6. The helical gear mold mechanism according to claim 1, characterized in that, The helical tooth mold mechanism further includes an outer heat-conducting sleeve and a cover with an internal space. The outer heat-conducting sleeve is rotatably sleeved on the sleeve. The side of the outer annular flap away from the base abuts against the outer heat-conducting sleeve. The rear mold insert and the outer heat-conducting sleeve are both located in the internal space. A third annular cooling space is provided between the outer wall of the outer heat-conducting sleeve and the inner wall of the internal space. The cover is provided with a third water inlet and a third water outlet, both of which are connected to the third annular cooling space.

7. The helical gear mold mechanism according to claim 6, characterized in that, The outer wall of the outer heat-conducting sleeve is also provided with a fifth annular groove and a sixth annular groove distributed at intervals. The helical tooth mold mechanism also includes a fifth sealing ring and a sixth sealing ring. The fifth sealing ring is sleeved in the fifth annular groove, and the sixth sealing ring is sleeved in the sixth annular groove. Both the fifth and sixth sealing rings abut against the inner wall of the internal space. The third annular cooling space is located between the fifth and sixth sealing rings.

8. The helical gear mold mechanism according to claim 1, characterized in that, The ejector sleeve is provided with an inner through hole, and the helical tooth mold mechanism further includes an ejector sleeve insert that is slidably inserted into the inner through hole; When the front mold core and the rear mold core are in the closed state, the sleeve insert abuts against the front mold insert.

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