Hot runner protection structure and mold

Abstract

The utility model discloses a hot runner protection structure and mould, the hot runner protection structure comprises a fixed mould and a hot runner, the fixed mould comprises at least two protection components, and a panel, a hot runner plate, a fixed mould plate and a fixed mould core which are connected in sequence, the panel and the hot runner plate enclose to form an accommodating space, a wire hole and at least two first through holes, the wire hole and the first through hole are both communicated with the containing space, the fixed mold plate is provided with at least two second through holes and at least two guide holes, the fixed mold core is provided with at least two glue injection holes, one end of the protection assembly is fixed to the hot runner plate, and the other end of the protection assembly is inserted into the guide holes; the hot runner comprises a glue injection assembly, a junction box, at least two nozzles, at least two heating rings and at least two temperature sensing wires, the glue injection assembly is located in the containing space, one end of each nozzle is installed on the glue injection assembly, and the other end of each nozzle sequentially penetrates through the corresponding first penetrating hole and the corresponding second penetrating hole and then is located in the corresponding glue injection hole; and one ends of the heating ring and the temperature sensing wire are connected with the corresponding nozzles, and the other ends penetrate through the wire holes and then are connected with the junction box.

Description

Technical Field

[0001] The utility model relates to the technical field of mold structures, in particular to a hot runner protection structure and a mold. Background Art

[0002] Hot runner systems are heating components used in injection molds to inject molten plastic particles into the mold cavity. Hot runners heat the plastic within the runner to maintain a molten state. Because a heating coil is located near or in the center of the runner, the entire runner, from the injection molding machine nozzle outlet to the hot runner tip, is kept at a high temperature, allowing the desired product to be formed within the mold cavity.

[0003] However, when there are multiple nozzles of the hot runner, the hot runner will shake after being lifted by a crane during installation. When installing it into the mold, it is difficult to align it with the hot nozzle slot in the template due to the shaking. More nozzles mean more hot nozzle slots that need to be aligned at the same time, which can easily damage the nozzle of the hot runner and cause damage to the hot runner. Utility Model Content

[0004] The purpose of the utility model is to provide a hot runner protection structure and a mold to solve the technical problem that when there are multiple nozzles of the existing hot runner, the hot runner will shake after being lifted by a crane during installation. When it is installed in the mold, it is difficult to align the hot nozzle groove in the template due to the shaking, which easily damages the nozzle of the hot runner and causes damage to the hot runner.

[0005] The utility model provides a hot runner protection structure, comprising:

[0006] A fixed mold, comprising a panel, a hot runner plate, a fixed mold plate, a fixed mold core, and at least two protective components, wherein the panel, the hot runner plate, the fixed mold plate, and the fixed mold core are sequentially connected, the panel and the hot runner plate enclose a receiving space, a wire hole, and at least two first through-holes, the wire hole and the first through-holes both being in communication with the receiving space, the panel being provided with an injection channel, the fixed mold plate being provided with at least two second through-holes and at least two guide holes, the fixed mold core being provided with at least two glue injection holes, one end of the protective component being fixed to the hot runner plate, and the other end being inserted into the guide hole;

[0007] The hot runner includes a glue injection assembly, a junction box, at least two nozzles, at least two heating coils and at least two temperature sensing wires. The glue injection assembly is located in the accommodating space, one end of the nozzle is installed on the glue injection assembly, and the other end is located in the glue injection hole after passing through the first perforation and the second perforation in sequence. The distance between the end of the protective assembly away from the hot runner plate and the hot runner plate is greater than the distance between the end of the nozzle away from the hot runner plate and the hot runner plate. The glue injection assembly is provided with a glue injection channel, and the nozzle is provided with a hot nozzle channel. One end of the glue injection channel is connected to the injection channel, and the other end is connected to the corresponding hot nozzle channel. One end of the heating coil and the temperature sensing wire are both connected to the corresponding nozzle, and the other end is connected to the junction box after passing through the wire hole.

[0008] Furthermore, the distance between the end of the protective component away from the hot runner plate and the hot runner plate is 20±1 mm different from the distance between the end of the nozzle away from the hot runner plate and the hot runner plate.

[0009] Furthermore, the protective assembly includes a protective rod, a positioning block and at least two fasteners. The hot runner plate is provided with at least two receiving grooves, at least four threaded holes, at least two first concave cavities and at least two positioning holes. The first concave cavity and at least two threaded holes are recessed on the bottom wall of the corresponding receiving groove. The positioning hole is recessed on the bottom wall of the first concave cavity. The protective rod is "T"-shaped. One end of the protective rod is located in the first concave cavity, and the other end passes through the positioning hole and is inserted into the guide hole. The positioning block is located in the receiving groove and covers the protective rod. The positioning block is provided with at least two third through holes. The fastener passes through the third through holes and is connected to the threaded hole.

[0010] Furthermore, one end of the protection rod away from the hot runner plate is provided with a chamfer.

[0011] Furthermore, the glue injection assembly includes a main frame having the glue injection flow channel, each of the nozzles is connected to the main frame, the glue injection flow channel includes a main flow channel and at least two branch flow channels connected to the main flow channel, the main flow channel is connected to the injection flow channel, and each branch flow channel is respectively connected to each hot nozzle flow channel.

[0012] Furthermore, the glue injection assembly also includes at least two driving mechanisms and at least two valve needles, and the main frame is also provided with at least two fourth perforations, each of the fourth perforations is respectively connected to each of the branch channels, one end of the valve needle is installed on the output end of the driving mechanism, and the other end is located in the hot nozzle flow channel after passing through the corresponding fourth perforations and the branch channels in sequence, and the driving mechanism can drive the valve needle to seal the corresponding hot nozzle flow channel.

[0013] Furthermore, the hot runner plate is also provided with a receiving groove, at least two second concave cavities and at least two first through-holes, the second concave cavity is provided on the bottom wall of the receiving groove, the first through-hole is provided on the bottom wall of the second concave cavity, the panel covers the receiving groove, and the panel is also provided with at least two embedded holes both connected to the receiving groove, the inner wall of the embedded hole, the panel, the inner wall of the receiving groove and the inner wall of each second concave cavity together form the receiving space, the driving mechanism is installed on the embedded hole, the main frame is located in the receiving groove, one end of the nozzle is connected to the main frame, and the other end of the nozzle is located in the glue injection hole after passing through the second concave cavity, the first through-hole and the second through-hole in sequence, one end of the heating coil and the temperature sensing wire are both located in the corresponding second concave cavity, and the other end is connected to the junction box after passing through the wire hole.

[0014] Furthermore, a wire groove communicating with the accommodating space is provided on a side of the hot runner plate facing the panel, and an inner wall of the wire groove and the panel are enclosed to form the wire hole.

[0015] Furthermore, the hot runner protection structure also includes a plurality of wire buckles, which are installed on the hot runner plate and seal the middle of the heating coil and the middle of the temperature sensing wire in the wire groove.

[0016] The utility model also provides a mold, comprising the hot runner protection structure as described above.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The utility model is provided with a plurality of protective components on the hot runner plate of the mold; the hot runner, the panel and the hot runner plate are assembled into a whole; the fixed mold plate and the fixed mold core are assembled into a whole; the distance between the end of the protective component away from the hot runner plate and the hot runner plate is greater than the distance between the end of the nozzle head away from the hot runner plate and the hot runner plate; during installation, the protective component can be first inserted into the guide hole of the fixed mold plate; and then the hot runner, the panel and the hot runner plate are integrally installed on the fixed mold plate; the protective component contacts the fixed mold plate before the nozzle head, thereby fully protecting the nozzle head in the hot runner and preventing it from being damaged during the installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the hot runner protection structure provided by the embodiment of the utility model Figure 1 ;

[0020] Figure 2 Schematic diagram of the hot runner protection structure provided by the embodiment of the utility model Figure 2 ;

[0021] Figure 3A cross-sectional view of a hot runner protection structure provided by an embodiment of the present utility model;

[0022] Figure 4 for Figure 1 explosion Figure 1 ;

[0023] Figure 5 for Figure 1 explosion Figure 2 ;

[0024] Figure 6 A schematic diagram of the structure of a portion of the hot runner provided in an embodiment of the present utility model installed on a hot runner plate;

[0025] Figure 7 for Figure 6 Exploded diagram;

[0026] Figure 8 A schematic diagram of the structure of the hot runner provided by an embodiment of the utility model after removing the junction box and the drive mechanism;

[0027] Figure 9 This is a schematic structural diagram of the hot runner plate provided in an embodiment of the present utility model.

[0028] In the picture:

[0029] 10. Fixed mold; 11. Accommodation space; 12. Wire hole; 13. First perforation; 20. Hot runner; 21. Glue injection assembly; 211. Main frame; 212. Drive mechanism; 213. Valve needle; 22. Junction box; 23. Nozzle; 231. Hot nozzle flow channel; 24. Heating coil; 25. Temperature sensor; 30. Panel; 31. Injection flow channel; 32. Embedding hole; 40. Hot runner plate; 41. Storage groove; 42. Threaded hole; 43. First cavity; 44 , positioning hole; 45, accommodating groove; 46, second concave cavity; 47, wire groove; 471, main groove; 472, sub-groove; 48, fifth perforation; 50, fixed template; 51, second perforation; 52, guide hole; 53, embedding groove; 54, avoidance groove; 60, fixed mold core; 61, glue injection hole; 70, protective component; 71, protective rod; 711, chamfer; 72, positioning block; 721, third perforation; 73, fastener; 80, wire buckle; 90, guide rod. DETAILED DESCRIPTION

[0030] Below, the present invention is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] See also Figures 1 to 9As shown, the embodiment of the present invention discloses a hot runner protection structure, which is mainly used in a mold. The hot runner protection structure includes a fixed mold 10 and a hot runner 20. The fixed mold 10 includes a panel 30, a hot runner plate 40, a fixed mold plate 50, a fixed mold core 60 and at least two protection components 70. The hot runner plate 40 is located between the panel 30 and the fixed mold plate 50. The fixed mold core 60 is located on the side of the fixed mold plate 50 away from the hot runner plate 40. The panel 30, the hot runner plate 40, the fixed mold plate 50 and the fixed mold core 60 are connected in sequence. The panel 30 and the hot runner plate 40 enclose a receiving space 11, a wire hole 12 and at least two first through-holes 13. The wire hole 12 and the first through-hole 13 are both connected to the fixed mold plate 50. The accommodating space 11 is connected, the line hole 12 extends from the inner wall of the accommodating space 11 to the top of the fixed mold 10, the first through-hole 13 is arranged horizontally, the panel 30 is provided with an injection channel 31, the fixed mold plate 50 is provided with at least two second through-holes 51 and at least two guide holes 52, the fixed mold core 60 is provided with at least two glue injection holes 61, one end of the second through-hole 51 is connected to the corresponding first through-hole 13, and the other end of the second through-hole 51 is connected to the corresponding glue injection hole 61, and the glue injection hole 61 is used to communicate with the cavity in the mold. The number of protective components 70 and guide holes 52 is four, one end of the protective component 70 is fixed on the hot runner plate 40, and the other end is inserted into the guide hole 52.

[0032] The hot runner 20 includes a glue injection assembly 21, a junction box 22, at least two nozzles 23, at least two heating coils 24 and at least two temperature sensing wires 25. The junction box 22 is used to connect to an external power supply. The glue injection assembly 21 is located in the accommodating space 11. One end of the nozzle 23 is installed on the glue injection assembly 21, and the other end passes through the corresponding first through-hole 13 and second through-hole 51 in sequence and is located in the glue injection hole 61. The distance between the end of the protective assembly 70 away from the hot runner plate 40 and the hot runner plate 40 is greater than the distance between the end of the nozzle 23 away from the hot runner plate 40 and the hot runner plate 40. The distance between them is shown in FIG. 2 , and the glue injection component 21 is provided with a glue injection flow channel, and the nozzle head 23 is provided with a hot nozzle flow channel 231. One end of the glue injection flow channel is connected with the injection flow channel 31, and the other end is connected with the corresponding hot nozzle flow channel 231. The nozzle head 23, the heating coil 24 and the temperature sensing line 25 are in a one-to-one correspondence. One end of the heating coil 24 and the temperature sensing line 25 are connected with the corresponding nozzle head 23, and the other end is connected with the junction box 22 after passing through the wire hole 12. During installation, the protective component 70 contacts the fixed template 50 before the nozzle head 23, which fully protects the nozzle head 23 in the hot runner 20 and prevents it from being damaged during installation.

[0033] The distance between the end of the protective component 70 away from the hot runner plate 40 and the hot runner plate 40 is 20±1mm different from the distance between the end of the nozzle 23 away from the hot runner plate 40 and the hot runner plate 40. When the protective component 70 has been inserted into the guide hole 52 of the hot runner plate 40 by 15mm, it is sufficient to position the hot runner plate 40 without causing the hot runner 20 on the hot runner plate 40 to shake, thereby protecting the nozzle 23 in the hot runner 20 from being damaged during installation.

[0034] In some embodiments, an embedding groove 53 is provided on the side of the fixed mold plate 50 facing the fixed mold core 60, and each second through-hole 51 is connected to the embedding groove 53. The fixed mold core 60 is installed on the embedding groove 53, thereby fixing the fixed mold core 60 on the fixed mold plate 50.

[0035] The protection assembly 70 includes a protection rod 71, a positioning block 72 and at least two fasteners 73. The hot runner plate 40 is provided with at least two receiving grooves 41, at least four threaded holes 42, at least two first concave cavities 43 and at least two positioning holes 44. The first concave cavity 43 and the at least two threaded holes 42 are recessed on the bottom wall of the corresponding receiving groove 41. The positioning hole 44 is recessed on the bottom wall of the first concave cavity 43. The protection rod 71 is "T" shaped. One end of the protection rod 71 is located in the first concave cavity 43 and the other end passes through the corresponding positioning hole 44. Then it is inserted into the guide hole 52, the positioning block 72 is located in the receiving groove 41 and covers the protective rod 71, the positioning block 72 is provided with at least two third through-holes 721, the number of the protective rod 71, the positioning block 72, the receiving groove 41, the first cavity 43 and the positioning hole 44 are four, the number of fasteners 73 is sixteen, and four fasteners 73 are installed on each positioning block 72. The fasteners 73 pass through the third through-hole 721 and are connected to the threaded hole 42, thereby fixing the protective rod 71 on the hot runner plate 40, and the fasteners 73 are screws.

[0036] In some embodiments, a C-shaped chamfer 711 is provided at one end of the protective rod 71 away from the hot runner plate 40, and a C-shaped chamfer 711 is also provided on the guide hole 52 of the fixed template 50, so that the protective rod 71 can be more easily aligned with the guide hole 52 when installed.

[0037] In this embodiment, the glue injection assembly 21 includes a main frame 211 having a glue injection flow channel, and each nozzle head 23 is connected to the main frame 211. The glue injection flow channel includes a main flow channel and at least two branch flow channels connected to the main flow channel. The main flow channel is connected to the injection flow channel 31, and each branch flow channel is respectively connected to each hot nozzle flow channel 231, so that an external injection molding machine can inject glue into each cavity.

[0038] The glue injection assembly 21 also includes at least two driving mechanisms 212 and at least two valve needles 213. The main frame 211 is also provided with at least two fourth through-holes, each of which is connected to each branch channel. The fourth through-hole extends from the inner wall of the branch channel to the outer wall of the main frame 211. The fourth through-hole, part of the branch channel and the hot nozzle flow channel 231 are coaxially arranged. One end of the valve needle 213 is installed on the output end of the driving mechanism 212, and the other end passes through the corresponding fourth through-hole and the branch channel in sequence and is located at In the hot nozzle flow channel 231, the number of the driving mechanism 212, the valve needle 213 and the fourth perforation are all four. The driving mechanism 212 can drive the valve needle 213 to block the corresponding hot nozzle flow channel 231. Specifically, when the mold is injecting glue, the driving mechanism 212 will drive the valve needle 213 to open the hot nozzle flow channel 231. After the glue is injected, the driving mechanism 212 will drive the valve needle 213 to close the hot nozzle flow channel 231 to achieve precise control of the glue. The driving mechanism 212 can be an oil cylinder or an air cylinder.

[0039] In this embodiment, the hot runner plate 40 is further provided with a receiving groove 45, at least two second concave cavities 46 and at least two of the first through-holes 13, the second concave cavity 46 is provided on the bottom wall of the receiving groove 45, the first through-hole 13 is provided on the bottom wall of the second concave cavity 46, the panel 30 covers the receiving groove 45, and the panel 30 is further provided with at least two embedded holes 32 both connected to the receiving groove 45, the inner wall of the embedded hole 32, the panel 30, the inner wall of the receiving groove 45 and the inner wall of each second concave cavity 46 enclose the receiving space 11, and the drive The mechanism 212 is installed on the embedded hole 32, the main frame 211 is located in the accommodating groove 45, one end of the nozzle head 23 is connected to the main frame 211, and the other end of the nozzle head 23 passes through the second concave cavity 46, the first through hole 13 and the second through hole 51 in sequence and is located in the injection hole 61. One end of the heating coil 24 and the temperature sensing wire 25 are both located in the corresponding second concave cavity 46 and connected to the corresponding nozzle head 23. The other ends of the heating coil 24 and the temperature sensing wire 25 pass through the wire hole 12 and are connected to the junction box 22 to fix the hot runner 20.

[0040] A wire groove 47 communicating with the accommodating space 11 is provided on one side of the hot runner plate 40 facing the panel 30. The inner wall of the wire groove 47 and the panel 30 together form the wire hole 12. The wire groove 47 is only provided on the hot runner plate 40, which can reduce the manufacturing cost of the mold.

[0041] In some embodiments, the wire groove 47 includes a main groove 471 and multiple sub-grooves 472 connected to the main groove 471 . The heating coil 24 and the temperature sensing wire 25 can select the corresponding sub-grooves 472 as needed to facilitate wiring of the hot runner 20 .

[0042] The hot runner protection structure also includes a plurality of wire clips 80, which are installed on the hot runner plate 40 and seal the middle of the heating coil 24 and the middle of the temperature sensing wire 25 in the wire groove 47. During the assembly of the mold, the wire clips 80 can prevent the heating coil 24 and the temperature sensing wire 25 from deviating from the wire groove 47 and mistakenly clamping the heating coil 24 and the temperature sensing wire 25 between the panel 30 and the hot runner plate 40.

[0043] The hot runner protection structure also includes multiple guide rods 90. The hot runner plate 40 is also penetrated by multiple fifth through-holes 48. The fixed mold plate 50 is also provided with multiple avoidance grooves 54. One end of the guide rod 90 is fixed to the panel 30, and the other end passes through the corresponding fifth through-hole 48 and is located in the avoidance groove 54, so as to facilitate fixing the panel 30 to the hot runner plate 40.

[0044] The utility model also discloses a mold, including a movable mold and the hot runner protection structure as described above, the movable mold including a movable mold core, a movable template, a bottom plate, an ejection mechanism and two square irons, the two ends of the square irons are respectively connected to the movable template and the bottom plate, the movable template, the bottom plate and the two square irons enclose a through cavity, the rear mold core is installed on the movable template, the ejection mechanism includes a top plate, multiple ejectors, multiple support rods and multiple springs, the support rods are fixed on the inner wall of the through cavity, the top plate is slidably installed on the support rods, the springs are sleeved on the support rods, one end of the spring is in contact with the top plate, and the other end is in contact with the inner wall of the through cavity, one end of the ejector is connected to the top plate, and the other end passes through the movable template and the movable mold core in sequence, the movable mold core and the fixed mold core 60 can enclose to form the described cavity.

[0045] The assembly steps of the hot runner protection structure are as follows:

[0046] S101, assemble the hot runner 20, first fix each nozzle 23 on the main frame 211, then install one end of each heating coil 24 and each temperature sensing wire 25 on the corresponding nozzle 23, and the other end on the junction box 22;

[0047] S102, assemble the fixed mold 10, first install the fixed mold core 60 on the fixed mold plate 50, install the hot runner 20 in the above step S101 on the hot runner plate 40, wherein the main frame 211 is located in the receiving groove 45, the nozzle 23 passes through the second cavity 46 and the first through-hole 13 in sequence, the heating coil 24 and one end of the temperature sensing line 25 are both located in the corresponding second cavity 46 and connected to the corresponding nozzle 23, the other end of the heating coil 24 and the temperature sensing line 25 are both passed through the corresponding line After the valve stem 213 is inserted into the hot runner plate 40, the valve stem 213 is connected to the junction box 22 through the groove 47. Then, each protective assembly 70 is installed on the hot runner plate 40. The four driving mechanisms 212 are respectively installed on the four embedded holes 32 of the panel 30. The panel 30 is fixed to the hot runner plate 40. One end of the valve needle 213 is installed on the output end of the driving mechanism 212, and the other end passes through the corresponding fourth through-hole and the branch channel of the main frame 211 in sequence and is located in the hot nozzle flow channel 231. Finally, the junction box 22 is fixed to the hot runner plate 40.

[0048] S103, assemble the mold, use a crane to lift the hot runner 20, hot runner plate 40 and panel 30 in S102 together, then lower the height to insert the protective component 70 into the guide hole 52 of the fixed mold plate 50, and then install the hot runner 20, panel 30 and hot runner plate 40 as a whole on the fixed mold plate 50, and the nozzle head 23 passes through the second through hole 51 and is located in the injection hole 61, and finally installed with the movable mold to complete the assembly. The second through hole 51 and the injection hole 61 constitute the hot nozzle slot in the background technology.

[0049] When the mold is closed, the movable mold moves toward the side of the fixed mold 10, and the movable mold core and the fixed mold core 60 enclose at least one cavity. The injection molding machine heats the heating coil 24 in the injection assembly 21 through the junction box 22, and the temperature sensing wire 25 simultaneously transmits the measured temperature to the external injection molding machine through the junction box 22. When the mold is opened, the movable mold is separated from the fixed mold 10, and the ejection mechanism ejects the product in the cavity through the ejector.

[0050] To sum up, the utility model installs multiple protective components 70 on the hot runner plate 40 of the mold, the hot runner 20, the panel 30 and the hot runner plate 40 are assembled into a whole, the fixed mold plate 50 and the fixed mold core 60 are assembled into a whole, and the distance between the end of the protective component 70 away from the hot runner plate 40 and the hot runner plate 40 is greater than the distance between the end of the nozzle 23 away from the hot runner plate 40 and the hot runner plate 40. During installation, the protective component 70 can be first inserted into the guide hole 52 of the fixed mold plate 50, and then the hot runner 20, the panel 30 and the hot runner plate 40 are installed as a whole on the fixed mold plate 50. The protective component 70 contacts the fixed mold plate 50 before the nozzle 23, fully protecting the nozzle 23 in the hot runner 20 to prevent it from being damaged during installation.

[0051] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A hot runner protection structure, characterized in that: include: A fixed mold, comprising a panel, a hot runner plate, a fixed mold plate, a fixed mold core, and at least two protective components, wherein the panel, the hot runner plate, the fixed mold plate, and the fixed mold core are sequentially connected, the panel and the hot runner plate enclose a receiving space, a wire hole, and at least two first through-holes, the wire hole and the first through-holes both being in communication with the receiving space, the panel being provided with an injection channel, the fixed mold plate being provided with at least two second through-holes and at least two guide holes, the fixed mold core being provided with at least two glue injection holes, one end of the protective component being fixed to the hot runner plate, and the other end being inserted into the guide hole; The hot runner includes a glue injection assembly, a junction box, at least two nozzles, at least two heating coils and at least two temperature sensing wires. The glue injection assembly is located in the accommodating space, one end of the nozzle is installed on the glue injection assembly, and the other end is located in the glue injection hole after passing through the first perforation and the second perforation in sequence. The distance between the end of the protective assembly away from the hot runner plate and the hot runner plate is greater than the distance between the end of the nozzle away from the hot runner plate and the hot runner plate. The glue injection assembly is provided with a glue injection channel, and the nozzle is provided with a hot nozzle channel. One end of the glue injection channel is connected to the injection channel, and the other end is connected to the corresponding hot nozzle channel. One end of the heating coil and the temperature sensing wire are both connected to the corresponding nozzle, and the other end is connected to the junction box after passing through the wire hole.

2. The hot runner protection structure according to claim 1, characterized in that: The distance between the end of the protective component away from the hot runner plate and the hot runner plate is 20±1 mm different from the distance between the end of the nozzle away from the hot runner plate and the hot runner plate.

3. The hot runner protection structure according to claim 1, wherein: The protective assembly includes a protective rod, a positioning block and at least two fasteners. The hot runner plate is provided with at least two receiving grooves, at least four threaded holes, at least two first concave cavities and at least two positioning holes. The first concave cavity and at least two threaded holes are recessed on the bottom wall of the corresponding receiving groove. The positioning hole is recessed on the bottom wall of the first concave cavity. The protective rod is "T"-shaped. One end of the protective rod is located in the first concave cavity, and the other end passes through the positioning hole and is inserted into the guide hole. The positioning block is located in the receiving groove and covers the protective rod. The positioning block is provided with at least two third through holes. The fastener passes through the third through holes and is connected to the threaded hole.

4. The hot runner protection structure according to claim 3, characterized in that: One end of the protection rod away from the hot runner plate is provided with a chamfer.

5. The hot runner protection structure according to claim 1, wherein: The glue injection assembly includes a main frame having the glue injection flow channel, and each of the nozzles is connected to the main frame. The glue injection flow channel includes a main flow channel and at least two branch flow channels that are connected to the main flow channel. The main flow channel is connected to the injection flow channel, and each of the branch flow channels is respectively connected to each of the hot nozzle flow channels.

6. The hot runner protection structure according to claim 5, characterized in that: The glue injection assembly also includes at least two driving mechanisms and at least two valve needles. The main frame is also provided with at least two fourth perforations, each of which is connected to each of the branch channels respectively. One end of the valve needle is installed on the output end of the driving mechanism, and the other end is located in the hot nozzle flow channel after passing through the corresponding fourth perforations and the branch channels in sequence. The driving mechanism can drive the valve needle to seal the corresponding hot nozzle flow channel.

7. The hot runner protection structure according to claim 6, wherein: The hot runner plate is also provided with a receiving groove, at least two second concave cavities and at least two first through-holes, the second concave cavity is provided on the bottom wall of the receiving groove, the first through-hole is provided on the bottom wall of the second concave cavity, the panel covers the receiving groove, and the panel is also provided with at least two embedded holes both connected to the receiving groove, the inner wall of the embedded hole, the panel, the inner wall of the receiving groove and the inner wall of each second concave cavity together form the receiving space, the driving mechanism is installed on the embedded hole, the main frame is located in the receiving groove, one end of the nozzle is connected to the main frame, and the other end of the nozzle is located in the glue injection hole after passing through the second concave cavity, the first through-hole and the second through-hole in sequence, one end of the heating coil and the temperature sensing wire are both located in the corresponding second concave cavity, and the other end is connected to the junction box after passing through the wire hole.

8. The hot runner protection structure according to claim 1, wherein: A wire groove communicating with the accommodating space is provided on a side of the hot runner plate facing the panel, and an inner wall of the wire groove and the panel are enclosed to form the wire hole.

9. The hot runner protection structure according to claim 8, wherein: The hot runner protection structure further includes a plurality of wire buckles, which are mounted on the hot runner plate and seal the middle of the heating coil and the middle of the temperature sensing wire in the wire groove.

10. A mold, characterized in that: The hot runner protection structure comprises the hot runner protection structure according to any one of claims 1 to 9.

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