Injection mold

Abstract

The injection mold comprises a hot nozzle and a hot nozzle sleeve, the injection mold comprises an injection molding cavity, the hot nozzle sleeve comprises a body part, the cavity wall of the injection molding cavity comprises the outer end wall of the body part, the body part is provided with a containing cavity, and at least part of the hot nozzle is located in the containing cavity. The body part is provided with a fluid channel, and at least part of the fluid channel is located on the periphery of the cavity wall of the containing cavity. The injection mold has the characteristic of improving the quality of injection products.

Description

Technical Field

[0001] This application relates to the field of injection molding technology, and particularly to an injection mold.

Background Art

[0002] Injection molds have been widely used in the preparation of products. During the product preparation process, the rubber material in the hot runner enters the injection cavity. If the temperature of the cavity wall of the injection cavity is close to the temperature of the rubber material, the rubber material does not crystallize sufficiently, thus affecting the quality of the product. Therefore, how to improve the product quality is a technical problem.

Summary of the Invention

[0003] The purpose of this application is to provide an injection mold, which is conducive to the sufficient crystallization of the rubber material, and thus conducive to improving the quality of the injection molded product.

[0004] To achieve the above purpose, an embodiment of this application adopts the following technical solution:

[0005] An injection mold, the injection mold includes a nozzle and a nozzle sleeve, the injection mold includes an injection cavity, the nozzle sleeve includes a body part, the cavity wall of the injection cavity includes the outer end wall of the body part, the body part has a receiving cavity, at least part of the nozzle is located in the receiving cavity, the body part has a fluid channel, and at least part of the fluid channel is located outside the periphery of the cavity wall of the receiving cavity.

[0006] In the above technical solution, the body part of the nozzle sleeve has a receiving cavity, at least part of the nozzle is located in the receiving cavity, the temperature of the nozzle is relatively high, heat exchange occurs between the nozzle and the nozzle sleeve, making the temperature of the nozzle sleeve rise. The injection mold includes an injection cavity, the cavity wall of the injection cavity includes the outer end wall of the nozzle sleeve, the body part has a fluid channel, and at least part of the fluid channel is located outside the periphery of the cavity wall of the receiving cavity. The working medium in the fluid channel can exchange heat with the nozzle sleeve, making the temperature of the cavity wall of the injection cavity uniform, which is conducive to the sufficient crystallization of the rubber material in the injection cavity, and thus conducive to improving the quality of the injection molded product.

Description of the Drawings

[0007] Figure 1 is a schematic structural diagram of an injection mold according to an embodiment of this application;

[0008] Figure 2 is Figure 1 a schematic cross-sectional structural diagram of an injection molded part related to the injection mold shown;

[0009] Figure 3 is Figure 1 a schematic diagram of the first front mold assembly shown;

[0010] Figure 4 is Figure 1 a schematic diagram of the first rear mold assembly shown;

[0011] Figure 5 It is a schematic top view of the mating connection between the first front mold component and the first rear mold component;

[0012] Figure 6 It is Figure 5 a schematic cross-sectional view of the A-A section in

[0013] Figure 7 It is Figure 6 a schematic diagram of the first state of the enlarged B part in

[0014] Figure 8 It is Figure 7 a schematic diagram of the enlarged C part in

[0015] Figure 9 It is Figure 6 a schematic diagram of the second state of the enlarged B part in

[0016] Figure 10 It is Figure 9 a schematic diagram of the enlarged C part in

[0017] Figure 11 It is a schematic diagram of the mating connection between the glue injection seat and the hot nozzle sleeve;

[0018] Figure 12 It is a schematic diagram of the glue injection seat;

[0019] Figure 13 It is Figure 10 a schematic cross-sectional view of the glue injection seat shown in

[0020] Figure 14 It is Figure 13 a schematic diagram of the enlarged A part in

[0021] Figure 15 It is a schematic diagram of the first perspective of the hot nozzle sleeve;

[0022] Figure 16 It is a schematic diagram of the first perspective of the hot nozzle sleeve;

[0023] Figure 17 It is Figure 16 a schematic cross-sectional view of the A-A section in

[0024] Figure 18 It is Figure 17 a schematic diagram of the enlarged B part in

[0025] Figure 19 It is a schematic diagram of the first perspective of the fluid channel in the hot nozzle sleeve;

[0026] Figure 20 It is a schematic diagram of the second perspective of the fluid channel in the hot nozzle sleeve;

[0027] Figure 21 It is a schematic diagram of the glue injection seat cooperating and connecting with the driving component, the valve needle and the connecting plate;

[0028] Figure 22 It is a schematic diagram of the first perspective of the driving component, the valve needle and the connecting plate cooperating and connecting;

[0029] Figure 23 It is a schematic diagram of the second perspective of the driving component, the valve needle and the connecting plate cooperating and connecting;

[0030] Figure 24 is Figure 23 An enlarged schematic diagram of part A in

[0031] Reference numerals: 1. Glue injection seat; 11. Positioning part; 12. Main body part; 121. Fitting part; 122. Third end face; 123. Fourth end face; 13. Hot nozzle; 131. Hot branch flow channel; 1311. First opening; 132. First flow-through part; 133. Second flow-through part; 134. Third flow-through part; 135. First end face; 14. Connecting part; 141. Glue inlet flow channel; 2. Hot nozzle sleeve; 21. Body part; 211. Outer end wall; 22. Limiting part; 23. Accommodating cavity; 231. First accommodating cavity; 232. Second accommodating cavity; 234. Glue injection channel; 2341. First glue injection channel; 2342. Inner wall; 2343. Second opening; 2344. Second glue injection channel; 2345. First inner wall; 2346. Second inner wall; 235. Fluid channel; 236. Second end face; 2351. First heat dissipation channel; 2352. Second heat dissipation channel; 2353. Inflow channel; 2354. First inflow sub-channel; 2355. Second inflow sub-channel; 2356. Outflow channel; 2357. First outflow sub-channel; 2358. Second outflow sub-channel; 24. Water inlet; 25. Water outlet; 26. Fifth end face; 3. Hot nozzle sleeve fixing seat; 4. Driving component; 41. Cylinder; 411. Piston rod; 5. Connecting plate; 51. Hole part; 52. First surface; 53. Second surface; 6. Valve needle; 6a. First valve needle; 6b. Second valve needle; 6c. Third valve needle 61. First part; 62. Second part; 63. Flow guiding part; 631. First flow guiding sub-part; 632. Second flow guiding sub-part; 64. Third part; 10. First front mold component; 101. First front mold panel; 102. First front mold base; 103. First front mold intermediate plate; 104. First front mold fixing plate; 20. Second front mold component; 30. First rear mold component; 30'. Second rear mold component; 10a. First injection molding groove; 30a. First molding groove; 40. Injection molding cavity; 401. First cavity wall; 50. Injection molded part; 501. First component; 502. Second component; 503. Insert.

Detailed implementation manners

[0032] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0033] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. The upper and lower orientation words involved in this article are defined based on the positions of the components shown in the drawings, only for the sake of clarity and convenience in expressing the technical solutions. It should be understood that the orientation words used in this article should not limit the scope of protection claimed by the present application.

[0034] The present application provides an injection mold, which is applicable to molding double-shot injection molded parts. A double-shot injection molded part refers to injecting two different materials into the same set of molds to obtain the injection molded parts. In other words, a double-shot injection molded part is formed by a molding process of two materials. Generally, the two materials can be of different colors, or different in hardness and softness, or two different materials of the same color, etc., so as to improve the aesthetics and assembly performance of the product. For example, Figure 2 as shown, the double-shot injection molded part 50 includes a first component 501 and a second component 502. The second component 502 wraps the first component 501. The first component 501 and the second component 502 are made of two different materials of the same color, for example, the material includes PPS.

[0035] Please refer to Figures 1 to 24 , the injection mold includes a first front mold assembly 10, a second front mold assembly 20, a first rear mold assembly 30, and a second rear mold assembly 30'. The first front mold assembly 10 and the first rear mold assembly 30 are arranged in cooperation, and the second front mold assembly 20 and the second rear mold assembly 30' are arranged in cooperation. Among them, the first front mold assembly 10 has a first injection groove 10a, and the first rear mold assembly 30 has a first molding groove 30a. After the first front mold assembly 10 and the first rear mold assembly 20 are clamped, an injection cavity 40 is formed. The insert 503 of the first shot is placed in the first injection groove 10a. After the first front mold assembly 10 and the first rear mold assembly 20 are clamped, the first component 501 is injection molded in the first rear mold assembly 20. After the second front mold assembly 20 and the second rear mold assembly 30' are clamped, an injection cavity 40 is formed to injection mold the second component 502. By separately arranging the first rear mold assembly 30 and the second rear mold assembly 30' corresponding to the first front mold assembly 10 and the second front mold assembly 20, the injection molding of the double-shot injection molded part is made more convenient and simple, without the need to disassemble and reassemble the components of the front mold assembly, improving the injection molding efficiency. In other embodiments, the first rear mold assembly 30 and the second rear mold assembly 30' may be an integral part.

[0036] The first front mold assembly 10 includes a first front mold panel 101, a first front mold base 102, a first front mold intermediate plate 103, and a first front mold fixing plate 104. In the axial direction of the first front mold assembly 10, the first front mold base 102 is located between the first front mold panel 101 and the first front mold fixing plate 104, the first front mold intermediate plate 103 is located between the first front mold panel 101 and the first front mold fixing plate 104, and the first front mold intermediate plate 103 is farther from the first front mold panel 101 than the first front mold base 102. The first front mold assembly 10 includes a glue injection seat 1, a nozzle sleeve 2, and a nozzle sleeve fixing seat 3. The first front mold intermediate plate 103 supports the glue injection seat 1. The nozzle sleeve 2 is fixedly connected to the nozzle sleeve fixing seat 3, the nozzle sleeve fixing seat 3 is fixedly connected to the first front mold base 102, the nozzle sleeve 2 has a receiving cavity 23, and at least part of the glue injection seat 1 is located in the receiving cavity 23. The glue injection seat 1 includes a connecting portion 14, a main body portion 12, and a nozzle 13. The connecting portion 14 connects the main body portion 12, and the nozzle 13 connects the main body portion 12. In one embodiment, the main body portion 12, the nozzle 13, and the connecting portion 14 are of an integral structure. The connecting portion 14 penetrates through the first front mold panel 101 and the first front mold base 102, the first front mold intermediate plate 103 supports the main body portion 12, and the nozzle 13 penetrates through the first front mold fixing plate 104.

[0037] Correspondingly, the second front mold assembly 20 includes a second front mold panel (not shown in the figure), a second front mold base (not shown in the figure), a second front mold intermediate plate (not shown in the figure), and a second front mold fixing plate (not shown in the figure). In the axial direction of the second front mold assembly 20, the second front mold base is located between the second front mold panel and the second front mold fixing plate, the second front mold intermediate plate is located between the second front mold panel and the second front mold fixing plate, and the second front mold intermediate plate is farther from the second front mold panel than the second front mold base. The second front mold assembly 20 includes a glue injection seat 1, a nozzle sleeve 2, and a nozzle sleeve fixing seat 3. The second front mold intermediate plate supports the glue injection seat 1. The nozzle sleeve 2 is fixedly connected to the nozzle sleeve fixing seat 3, the nozzle sleeve fixing seat 3 is fixedly connected to the first front mold fixing seat, the nozzle sleeve 2 has a receiving cavity 23, and at least part of the glue injection seat 1 is located in the receiving cavity 23. The glue injection seat 1 includes a connecting portion 14, a main body portion 12, and a nozzle 13. The connecting portion 14 connects the main body portion 12, and the nozzle connects the main body portion 12. In one embodiment, the main body portion 12, the nozzle 13, and the connecting portion 14 are of an integral structure. The connecting portion 14 penetrates through the second front mold panel and the second front mold base, the second front mold intermediate plate supports the main body portion 12, and the nozzle 13 penetrates through the second front mold fixing plate.

[0038] Please refer to Figure 1 , Figures 5 to 6 , Figures 11 to 13 and Figures 21 to 24, the first front mold assembly 10 or the second front mold assembly 20 includes a driving assembly 4, a connecting plate 5 and at least two valve pins 6. The driving assembly 4 is fixedly connected to the connecting plate 5, and the connecting plate 5 is fixedly connected to the valve pins 6. The driving assembly 4 includes a cylinder 41, and the cylinder 41 includes a piston rod 411. The piston rod 411 is fixedly connected to the connecting plate 5. In this embodiment, the piston rod 411 is threadedly connected to the connecting plate 5. Of course, in other embodiments, other connection methods may also be used, such as clamping. The driving assembly 4 further includes an electromagnetic valve. The cylinder 41 further includes a piston (not shown in the figure). After the injection molding is completed, the electromagnetic valve is opened, and compressed air is input into the cylinder 41. The air flow pushes the piston to make the piston rod 411 move telescopically, thereby driving the connecting plate 5 and the valve pins 6 to move synchronously. Driving at least two valve pins 6 by one cylinder 41 is beneficial to simplify the mold structure, and thus beneficial to realize the miniaturization of the injection mold.

[0039] The connecting plate 5 has at least one hole portion 51. The connecting plate 5 has a first surface 52 and a second surface 53. The hole portion 51 is recessed from the first surface 52 towards the second surface 53, and the hole portion 51 does not penetrate the second surface 53. In other words, the hole portion 51 is a blind hole. When the piston rod 411 drives the connecting plate 5 to move towards the direction close to the glue injection seat 1, the fitting clearance between the connecting plate 5 and the glue injection seat 1 is small. By providing the hole portion 51, it is beneficial to reduce the movement resistance of the connecting plate 5. The valve pin 6 includes a first portion 61, a second portion 62 and a third portion 64. The first portion 61 is connected to the second portion 62, the second portion 62 is connected to the third portion 64, and the third portion 64 is fixedly connected to the connecting plate 5. The second portion 62 extends from the first portion 61 towards the direction away from the first surface 52, and the third portion 64 extends from the second portion 62 towards the direction away from the first surface 52, which can make the valve pin 6 have a certain length in the axial direction of the first front mold assembly 10, so that the valve pin 6 can extend into the hot nozzle 13.

[0040] In this embodiment, the valve pin 6 includes a first valve pin 6a, a second valve pin 6b and a third valve pin 6c. The first valve pin 6a, the second valve pin 6b and the third valve pin 6c are arranged around the central axis of the connecting plate 5. The distance from the first valve pin 6a to the second valve pin 6b is equal to the distance from the second valve pin 6b to the third valve pin 6c, and / or the distance from the first valve pin 6a to the second valve pin 6b is equal to the distance from the first valve pin 6a to the third valve pin 6c. On the one hand, it can make there be a certain distance between adjacent valve pins 6, so that the rubber material in the hot nozzle 13 has a certain cut-off area.

[0041] The main body 12 includes a mating portion 121. The main body 12 has a third end face 122 and a fourth end face 123. In the axial direction of the first front mold assembly 10, the third end face 122 is farther from the nozzle sleeve 2 than the fourth end face 123. The mating portion 121 protrudes from the third end face 122 towards the connecting plate 5, and the mating portion 121 can contact the first surface 52 of the connecting plate 5. In an embodiment, the main body 12 includes a buffer portion which is an integral structure with the mating portion 121. In the axial direction of the main body 12, the buffer portion is closer to the connecting plate 5 than the mating portion 121. When the connecting plate 5 moves towards the glue injection seat 1, the buffer portion can reduce the impact force of the connecting plate 5 on the mating portion 121, which is beneficial to improving the service life of the component.

[0042] Please refer to Figures 1 to 24 , the glue injection seat 1 is used to connect the glue injection pipe of the injection molding machine. The glue injection seat 1 includes a positioning portion 11 which is connected to the glue injection pipe of the injection molding machine during glue injection and is used to position the relative position of the glue injection pipe of the injection molding machine and the glue injection seat 1. The glue injection seat 1 includes at least two nozzles 13, and the number of nozzles 13 is the same as the number of valve needles 6. The positioning portion 11 is located at the connecting portion 14, and the extending direction of the connecting portion 14 is opposite to the extending direction of the nozzle 13. Specifically, the nozzle 13 extends from the fourth end face 123 towards the nozzle sleeve 2, and the connecting portion 14 extends from the third end face 122 away from the nozzle sleeve 2. The connecting portion 14 has a glue inlet runner 141, and the main body 12 has a hot runner (not shown in the figure). The glue inlet runner 141 is communicated with the hot runner. The nozzle 13 has a hot branch runner 131, and the temperature of the glue in the hot branch runner 131 can be about 300 degrees Celsius, for example. The hot runner is communicated with the hot branch runner 131. The injection mold includes a glue injection channel 234. In this embodiment, the injection mold includes at least two glue injection channels 234, and the number of glue injection channels 234 is the same as the number of nozzles 13. The injection mold has an injection cavity 40. The cavity wall forming the injection cavity 40 includes a first cavity wall 401. The wall corresponding to the glue injection channel 234 includes an inner wall 2342 which extends from the first cavity wall 401 towards the nozzle 13. The hot branch runner 131 can be communicated with the glue injection channel 234, and the glue can directly enter the injection cavity 40 from the hot branch runner 131 without runner waste generation, which is beneficial to reducing production costs; in addition, the temperature loss of the glue in the hot branch runner 131 is small, which is beneficial to reducing pores and bubbles, and thus is beneficial to improving the quality of the injection molded product. Please refer to Figures 6 to 10 and Figures 17 to 18, the valve pin 6 includes a first portion 61. When the valve pin 6 is in the first position, the first portion 61 is located within the hot branch runner 131, and the hot branch runner 131 communicates with the injection channel 234. When the valve pin 6 is in the second position, the injection channel 234 includes a first injection channel 2341 and a second injection channel 2344. The second injection channel 2344 communicates with the hot branch runner 131. The first portion 61 is located within the first injection channel 2341, and the hot branch runner 131 is not in communication with the first injection channel 2341. By moving the valve pin 6, the opening and closing of the first injection channel 2341 can be achieved, which helps to avoid glue leakage from the first injection channel 234, and the operation is convenient, which is beneficial to improving work efficiency. The inner wall 2342 includes a first inner wall 2345 and a second inner wall 2346. The first inner wall 2345 is connected to the second inner wall 2346. The wall corresponding to the first injection channel 2341 includes the first inner wall 2345, and the wall corresponding to the second injection channel 2344 includes the second inner wall 2346. The second inner wall 2346 is inclined away from the central axis of the hot nozzle 13 with respect to the first inner wall 2345. On the one hand, when the glue enters the second injection channel 2344, the flow resistance of the glue is relatively small; on the other hand, during the process of the valve pin 6 moving to the second position, it has a guiding effect on the valve pin 6.

[0043] In one embodiment, please refer to Figures 7 to 18 , the hot nozzle sleeve 2 has a receiving cavity 23, and at least a part of the hot nozzle 13 is located within the receiving cavity 23. The hot nozzle 13 includes a first flow-through portion 132. The hot nozzle sleeve 2 has an injection channel 234. When the valve pin 6 is in the first position, the first portion 61 is located within the first flow-through portion 132. When the valve pin 6 is in the second position, the outer peripheral wall of the first portion 61 contacts the inner wall 2342. Specifically, the outer peripheral wall of the first portion 61 contacts the first inner wall 2345. The first portion 61 of the valve pin 6 is hermetically arranged with the injection channel 234, which can effectively prevent glue leakage from the injection channel 234, and the operation is convenient, which is beneficial to improving work efficiency. The hot nozzle 13 has a first end face 135, and the hot nozzle sleeve 2 has a second end face 236. The hot branch runner 131 has a first opening 1311 at the first end face 135, and the injection channel 234 has a second opening 2343 at the second end face 236; the first end face 135 abuts against the second end face 236, or, in the axial direction parallel to the hot nozzle 13, the first end face 135 and the second end face 236 do not contact, and there is a certain distance between the first end face 135 and the second end face 236. After the hot nozzle 13 expands due to heat, it thermally deforms axially towards the second end face 236, and the distance between the first end face 135 and the second end face 236 is greater than or equal to the thermal deformation amount of the hot nozzle 13 in its axial direction.

[0044] The hot nozzle 13 includes a second flow-through portion 133 and a third flow-through portion 134. In the axial direction of the hot nozzle 13, the second flow-through portion 133 is located between the first flow-through portion 132 and the third flow-through portion 134. The flow-through cross-sectional area of the first flow-through portion 132 is smaller than that of the third flow-through portion 134. The first flow-through portion 132 is closer to the glue injection channel 234 than the third flow-through portion 134. The smaller flow-through cross-sectional area of the first flow-through portion 132 can make the flow rate of the rubber material at the first flow-through portion 132 faster.

[0045] The wall corresponding to the hot branch flow channel 131 includes the inner wall of the first flow-through portion 132, the inner wall of the second flow-through portion 133, and the inner wall of the third flow-through portion 134. From the third flow-through portion 134 to the first flow-through portion 132, the flow-through cross-sectional area of the second flow-through portion 133 gradually decreases. The second flow-through portion 133 can have a certain buffering effect on the rubber material, making the flow rate of the rubber material gradually faster from the third flow-through portion 134 to the first flow-through portion 132.

[0046] The cavity wall of the accommodation cavity 23 includes a first inner wall 2345 and a second inner wall 2346. The second inner wall 2346 extends from the first inner wall 2345 to the second end face 236. The flow-through cross-sectional area of the first flow-through portion 132 is larger than that of the first glue injection channel 2341. The flow-through cross-sectional area of the glue injection channel 234 is smaller, and it is not easy to leak glue when the glue injection channel 234 is closed after glue injection.

[0047] In one embodiment, the hot nozzle 13 includes a first flow-through portion 132. The first flow-through portion 132 has a glue injection channel 234. When the valve needle 6 is in the second position, the outer peripheral wall of the first portion 61 contacts the wall corresponding to the glue injection channel 234. When the first flow-through portion 132 is severely worn, the hot nozzle can be directly replaced, which is convenient for maintenance.

[0048] Please refer to Figures 6 to 24 , the hot nozzle sleeve 2 has an accommodation cavity 23. The number of accommodation cavities 23 is the same as the number of hot nozzles 13. At least part of the hot nozzles 13 are located in the accommodation cavity 23. The valve needle 6 includes a first portion 61 and a second portion 62. The first portion 61 is connected to the second portion 62. The second portion 62 is located in the hot branch flow channel 131. The second portion 62 includes at least two diversion portions 63. The diversion portions 63 are recessed from the outer peripheral wall of the second portion 62 towards the direction close to the central axis of the valve needle. The diversion portions 63 have a diversion effect on the rubber material, which is beneficial to improving the flow rate of the rubber material.

[0049] The diversion portions 63 extend from the first portion 61 in the direction away from the first portion 61. In the direction parallel to the axial direction of the valve needle 6 or in the direction parallel to the axial direction of the hot nozzle, the length of the diversion portions 63 is greater than the length of the first flow-through portion 132. When the valve needle 6 is in the second position, in the radial direction of the hot nozzle 13, the rubber material can be located between the wall of the diversion portions 63 and the wall of the first flow-through portion 132. When the valve needle 6 moves, the rubber material can enter the glue injection channel 234 along the diversion portions 63.

[0050] The flow guiding portion 63 includes a first flow guiding sub-portion 631 and a second flow guiding sub-portion 632. In the axial direction of the valve pin 6, the first flow guiding sub-portion 631 is closer to the limiting portion 22 than the second flow guiding sub-portion 632. The circumferential length of the first flow guiding sub-portion 631 gradually increases in the direction approaching the limiting portion 22, and the circumferential length of the first flow guiding sub-portion 631 is shorter in the direction away from the limiting portion 22, which can guide the rubber material. When the valve pin 6 is in the second position, a larger accommodation space can be formed between the wall of the flow guiding portion 63 and the wall of the first flow passage portion 132 to accommodate the rubber material. The valve pin 6 includes a third portion 64, the second portion 62 is connected to the third portion 64, and the third portion 64 is fixedly connected to the connecting plate 5. Define a first plane, the central axis of the hot nozzle sleeve 2 or the central axis of the valve pin 6 is perpendicular to the first plane, and the projected area of the first portion 61 in the first plane is smaller than the projected area of the second portion 62 in the first plane.

[0051] The working principle of the present application is as follows: After injection molding is completed, the glue inlet runner 141 is communicated with the hot runner, the hot runner is communicated with the hot branch runner 131, the solenoid valve is opened, compressed air is input into the cylinder 41, the air flow pushes the piston to make the piston rod 411 extend, and then drives the connecting plate 5 and the valve pin 6 to move synchronously. The valve pin 6 enters the glue injection passage 234, and the glue injection passage 234 is blocked by the valve pin 6 to achieve glue sealing. When starting injection molding, the air flow pushes the piston to make the piston rod 411 retract, the valve pin 6 moves synchronously, the first portion 61 retracts into the hot branch runner 131, and the rubber material flows into the injection cavity 40 or the second accommodation cavity through the glue injection passage 234. By controlling the movement of the valve pin 6, the present application can effectively prevent the leakage of the glue injection passage 234, and the operation is convenient, which is beneficial to improving work efficiency.

[0052] Please refer to Figures 6 to 20 , the hot nozzle sleeve 2 includes a body portion 21, the cavity wall of the injection cavity 40 includes the outer end wall 211 of the body portion 21, the body portion 21 has an accommodation cavity 23, at least part of the hot nozzle 13 is located in the accommodation cavity 23, the body portion 21 has a fluid passage 235, and at least part of the fluid passage 235 is located outside the cavity wall of the accommodation cavity 23. The temperature of the hot nozzle 13 is relatively high, and the hot nozzle 13 exchanges heat with the hot nozzle sleeve 2, so that the temperature of the hot nozzle sleeve 2 rises. The fluid in the fluid passage 235 can exchange heat with the hot nozzle sleeve 2, so that the temperature of the cavity wall of the injection cavity 40 is uniform, which is beneficial to the sufficient crystallization of the rubber material in the injection cavity 40, and thus beneficial to improving the stability of the injection molded product.

[0053] The accommodation cavity 23 includes a first accommodation cavity 231 and a second accommodation cavity 232. The first accommodation cavity 231 communicates with the second accommodation cavity 232. The cavity wall of the first accommodation cavity 231 extends from the cavity wall of the second accommodation cavity 232 towards the outer end wall 211. At least part of the fluid passage 235 is located around the cavity wall of the first accommodation cavity 231. The cavity wall of the first accommodation cavity 231 is relatively close to the outer end wall 211. The wall corresponding to part of the fluid passage 235 is close to the cavity wall of the injection molding cavity 40, which can make the temperature of the cavity wall of the injection molding cavity 40 uniform, so that the rubber material in the injection molding cavity 40 crystallizes better, and thus is beneficial to improving the quality of the product. Please refer to Figures 16 to 20 , the fluid passage 235 includes a first heat dissipation passage 2351 and a second heat dissipation passage 2352. One end of the second heat dissipation passage 2352 communicates with a first heat dissipation passage 2351, and the other end of the second heat dissipation passage 2352 communicates with another first heat dissipation passage 2351. The first heat dissipation passage 2351 is located around the cavity wall of the first accommodation cavity 231. The cavity wall of the first accommodation cavity 231 is relatively close to the outer end wall 211. The wall corresponding to the first heat dissipation passage 2351 is close to the cavity wall of the injection molding cavity 40, which can make the temperature of the cavity wall of the injection molding cavity 40 uniform, so that the rubber material in the injection molding cavity 40 crystallizes better, and thus is beneficial to improving the quality of the product.

[0054] Please refer to Figure 19 , the flow cross-sectional area of the first heat dissipation passage 2351 is equal to that of the second heat dissipation passage 2352, and the length of the first heat dissipation passage 2351 is greater than that of the second heat dissipation passage 2352. Here, the "length of the first heat dissipation passage 2351" refers to the trajectory length measured along the shape trajectory of the first heat dissipation passage 2351 by projecting the first heat dissipation passage 2351 onto the first plane, and the "length of the second heat dissipation passage 2352" refers to the trajectory length measured along the shape trajectory of the second heat dissipation passage 2352 by projecting the second heat dissipation passage 2352 onto the first plane. The volume of the fluid in the first heat dissipation passage 2351 is larger. Since the wall corresponding to the first heat dissipation passage 2351 is relatively close to the cavity wall of the injection molding cavity 40, it can make the temperature of the cavity wall of the injection molding cavity 40 uniform, so that the rubber material in the injection molding cavity 40 crystallizes better, and thus is beneficial to improving the quality of the product.

[0055] Please refer to Figure 17 , the hot nozzle sleeve 2 further includes a limiting portion 22. The limiting portion 22 is integrally formed with the body portion 21. During injection molding, the limiting portion 22 limits the position of, for example, the insert 503 of the first shot (as Figure 2 shown). In the axial direction of the hot nozzle sleeve 2, the cavity wall of the first accommodation cavity 231 is closer to the limiting portion 22 than the cavity wall of the second accommodation cavity 232.

[0056] Please refer to Figures 17 to 20, the fluid passage 235 includes an inlet passage 2353. The inlet passage 2353 includes a first inlet sub-passage 2354 and a second inlet sub-passage 2355. The first inlet sub-passage 2354 communicates with the second inlet sub-passage 2355. The first inlet sub-passage 2354 has a water inlet 24. The second inlet sub-passage 2355 communicates with the first heat dissipation passage 2351. The extending direction of the first inlet sub-passage 2354 is parallel to the central axis of the nozzle sleeve 2, which is beneficial to reducing the flow resistance of the working medium, and thus beneficial to improving the heat exchange rate. The nozzle sleeve has a fifth end face 26. The first inlet sub-passage 2354 has a water inlet 24 at the fifth end face 26. The second inlet sub-passage 2355 is located outside the wall of the first accommodating cavity 231. The wall corresponding to the second inlet sub-passage 2355 can be relatively close to the wall of the injection cavity 40, which can make the temperature of the wall of the injection cavity 40 uniform, so that the rubber material in the injection cavity 40 crystallizes better, and thus is beneficial to improving the quality of the product.

[0057] Please refer to Figure 20 , the fluid passage 235 includes an outlet passage 2356. The outlet passage 2356 includes a first outlet sub-passage 2357 and a second outlet sub-passage 2358. The first outlet sub-passage 2357 has a water outlet 25. The first outlet sub-passage 2357 communicates with the second outlet sub-passage 2358. The second outlet sub-passage 2358 communicates with the first heat dissipation passage 2351. The extending direction of the first outlet sub-passage 2357 is parallel to the central axis of the nozzle sleeve 2, which is beneficial to reducing the flow resistance of the working medium, and thus beneficial to improving the heat exchange rate between the nozzle sleeve 2 and the working medium. The nozzle sleeve 2 has a fifth end face 26. The first outlet sub-passage 2357 has a water outlet 25 at the fifth end face 26. The flow direction of the working medium in the first inlet sub-passage 2354 is opposite to the flow direction of the working medium in the first outlet sub-passage 2357. The working medium flows in from the first inlet sub-passage 2354 and flows out from the first outlet sub-passage 2357, thus forming a heat dissipation cycle to continuously and effectively dissipate heat from the nozzle sleeve 2. The second outlet sub-passage 2358 is located outside the wall of the first accommodating cavity 231. The wall corresponding to the second outlet sub-passage 2358 can be relatively close to the wall of the injection cavity 40, which can make the temperature of the wall of the injection cavity 40 uniform, so that the rubber material in the injection cavity 40 crystallizes better, and thus is beneficial to improving the quality of the product.

[0058] Define a first height and a second height. The first height is the minimum distance from the wall corresponding to the first heat dissipation channel 2351 to the fifth end face 26, and the second height is the minimum distance from the wall corresponding to the second heat dissipation channel 2352 to the fifth end face 26. The first height is greater than or equal to the second height. When the first height is equal to the second height, the flow resistance of the working medium flowing from the first heat dissipation channel 2351 to the second heat dissipation channel 2352 is relatively small, which is beneficial to improving the flow rate of the working medium, and thus beneficial to improving the heat dissipation effect of the nozzle sleeve 2. When the first height is greater than the second height, the wall corresponding to the first heat dissipation channel 2351 is relatively close to the outer end wall 211, which can make the temperature of the cavity wall of the injection cavity 40 uniform, so that the rubber material in the injection cavity 40 crystallizes better, and thus is beneficial to improving the quality of the product.

[0059] The nozzle sleeve 2 has a glue injection channel 234. The wall corresponding to the glue injection channel 234 includes an inner wall 2342. The inner wall 2342 is connected to the outer end wall 211. The cavity wall of the first accommodation cavity 231 includes the inner wall 2342. At least part of the fluid channel 235 is located outside the cavity wall of the first accommodation cavity 231. The inner wall 2342 is connected to the outer end wall 211. The cavity wall of the injection cavity 40 includes the outer end wall 211. The cavity wall of the first accommodation cavity 231 is relatively close to the cavity wall of the injection cavity 40. At least part of the fluid channel 235 is located outside the cavity wall of the first accommodation cavity 231. The wall corresponding to part of the fluid channel 235 is close to the cavity wall of the injection cavity 40, which can make the temperature of the cavity wall of the injection cavity 40 uniform, so that the rubber material in the injection cavity 40 crystallizes better, and thus is beneficial to improving the quality of the product.

[0060] It should be noted that the above embodiments are only used to illustrate the present application and do not limit the technical solutions described in the present application. Although this specification has described the present application in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the technical field can still modify the present application or make equivalent replacements. All technical solutions and their improvements that do not depart from the spirit and scope of the present application shall be covered within the scope of the claims of the present application.

Claims

1. An injection mold, characterized in that, the injection mold includes a hot nozzle (13) and a hot nozzle sleeve (2), the injection mold includes an injection cavity (40), the hot nozzle sleeve (2) includes a body portion (21), the cavity wall of the injection cavity (40) includes an outer end wall (211) of the body portion (21), the body portion (21) has a receiving cavity (23), at least part of the hot nozzle (13) is located in the receiving cavity (23), the body portion (21) has a fluid channel (235), and at least part of the fluid channel (235) is located outside the periphery of the cavity wall of the receiving cavity (23).

2. The injection mold according to claim 1, characterized in that, the receiving cavity (23) includes a first receiving cavity (231) and a second receiving cavity (232), the cavity wall of the first receiving cavity (231) extends from the cavity wall of the second receiving cavity (232) towards the outer end wall (211), and at least part of the fluid channel (235) is located outside the periphery of the cavity wall of the first receiving cavity (231).

3. The injection mold according to claim 2, characterized in that, the fluid channel (235) includes a first heat dissipation channel (2351) and a second heat dissipation channel (2352), one end of the second heat dissipation channel (2352) communicates with one of the first heat dissipation channels (2351), the other end of the second heat dissipation channel (2352) communicates with the other first heat dissipation channel (2351), and the first heat dissipation channel (2351) is located outside the periphery of the cavity wall of the first receiving cavity (231).

4. The injection mold according to claim 3, characterized in that, the flow cross-sectional area of the first heat dissipation channel (2351) is equal to the flow cross-sectional area of the second heat dissipation channel (2352), and at least part of the length of the first heat dissipation channel (2351) is greater than the length of the second heat dissipation channel (2352).

5. The injection mold according to claim 3 or 4, characterized in that, the fluid channel (235) includes an inlet channel (2353), the inlet channel (2353) includes a first inlet sub-channel (2354) and a second inlet sub-channel (2355), the first inlet sub-channel (2354) communicates with the second inlet sub-channel (2355), the second inlet sub-channel (2355) communicates with the first heat dissipation channel (2351), and the extending direction of the first inlet sub-channel (2354) is parallel to the central axis of the hot nozzle sleeve (2).

6. The injection mold according to claim 5, characterized in that, the hot nozzle sleeve (2) has a fifth end face (26), the first inlet sub-channel (2354) has a water inlet (24) on the fifth end face (26), and the second inlet sub-channel (2355) is located outside the periphery of the cavity wall of the first receiving cavity (231).

7. The injection mold according to claim 5 or 6, characterized in that, The fluid passage (235) includes an outflow passage (2356). The outflow passage (2356) includes a first outflow sub-passage (2357) and a second outflow sub-passage (2358). The first outflow sub-passage (2357) communicates with the second outflow sub-passage (2358). The second outflow sub-passage (2358) communicates with the first heat dissipation passage (2351). The extending direction of the first outflow sub-passage (2357) is parallel to the central axis of the nozzle sleeve (2).

8. The injection mold according to claim 7, wherein the nozzle sleeve (2) has a fifth end face (26). The first outflow sub-passage (2357) has a water outlet (25) at the fifth end face (26). The flow direction of the working medium in the first inflow sub-passage (2354) is opposite to the flow direction of the working medium in the first outflow sub-passage (2357). The second outflow sub-passage (2358) is located on the periphery of the wall of the first accommodation cavity (231).

9. The injection mold according to claim 6 or 8 characterized in that a first height and a second height are defined. The first height is the minimum distance from the wall corresponding to the first heat dissipation passage (2351) to the fifth end face (26). The second height is the minimum distance from the wall corresponding to the second heat dissipation passage (2352) to the fifth end face (26). The first height is greater than or equal to the second height.

10. The injection mold according to any one of claims 2-9 characterized in that the nozzle sleeve (2) has an injection channel (234). The wall corresponding to the injection channel (234) includes an inner wall (2342). The inner wall (2342) is connected to the outer end wall (211). The wall of the first accommodation cavity (231) includes the inner wall (2342).

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