Injection mold

Abstract

The application relates to the field of equipment manufacturing, in particular to a mold for injection molding of a common trip arm of a circuit breaker. The mold is used for injection molding of a target part (1) in a rod shape, and the mold comprises a pair of sliders (2), a glue injection pipeline (41) extending into the pair of sliders (2), and cooling coils (3) arranged in the two sliders (2) respectively. Since the up-down direction of the injection molding cavity is along the length direction of the target part (1), and the cooling coils (3) are closer to the injection molding cavity, the target part (1) is close to the core temperature zone, which is beneficial to rapid cooling of the target part (1) after injection molding, reduces deformation and bending, and improves the injection molding precision of the target part (1), for example, the concentricity of the common trip arm.

Description

Technical Field

[0001] This invention relates to the field of equipment manufacturing, and in particular to an injection mold for a common tripping arm of a circuit breaker. Background Technology

[0002] Low-voltage circuit breakers, also known as automatic switches, are electrical appliances that function as both manual switches and automatic protectors against undervoltage, overload, and short circuits. If a fault occurs in the circuit of a miniature circuit breaker, its common trip arm will actuate, causing the handle to move. This, in turn, activates the auxiliary switch (AS mechanism) indicating the on / off state of the output circuit breaker, or activates the fault signal contact (FC mechanism) of the fault signal in the circuit containing the output circuit breaker.

[0003] The main body of the shared release arm is rod-shaped. The injection mold for the shared release arm includes at least an upper slide and a lower slide. A cavity is formed between the upper slide and the lower slide that is adapted to the structure and shape of the shared release arm. There are also a front mold core and a rear mold core outside the upper slide and the lower slide. Two heating rods are respectively inserted in the front mold core and the rear mold core to control the temperature during the injection molding process of the shared release arm. However, it is difficult to achieve precise temperature control during the molding process of the shared release arm, which can easily lead to poor concentricity of the shared release arm. Summary of the Invention

[0004] In view of this, the present invention proposes an injection mold to ensure the control effect of injection environment temperature during the injection molding process of the shared release arm, so as to improve the product accuracy of the shared release arm.

[0005] In one embodiment of the injection mold provided by the present invention, the injection mold is used for injection molding a target part with a rod-shaped main body. The injection mold includes a pair of sliders, an injection pipe extending one end into the pair of sliders, and cooling coils respectively disposed inside the two sliders. The inner walls of the two sliders in the pair are respectively formed with grooves adapted to one side of the target part, and the grooves on both sides of the two sliders after being fitted together form the injection cavity of the target part, with the vertical direction of the injection cavity along the length direction of the target part. One end of the injection pipe extends into the interior of the pair of sliders and communicates with the injection cavity, while the other end extends out of the pair of sliders. Two cooling coils are respectively disposed inside the two sliders, with the inlet and outlet sections of the cooling coils exposed above the sliders, and the cooling coils extending reciprocally bent relative to the grooves inside the sliders. For example, the cooling coils can be three-dimensional annular water channels.

[0006] As can be seen from the above solution, the injection mold provided by this invention can be used for injection molding of the common release arm of a circuit breaker. Furthermore, after adaptive adjustments to the shape and structure of the groove on the slider, it can also be used for injection molding of other rod-shaped target parts. During the injection molding process, the circulation pipes of the temperature control box are connected to the cooling coils inside the two sliders respectively. By maintaining the temperature of the coolant in the inlet and outlet sections of the cooling coils, the ambient temperature required for the injection molding process is maintained.

[0007] On the one hand, during the injection molding process, the injection system of the injection molding machine heats and plasticizes the plastic and injects it into the injection cavity formed between a pair of sliders at a certain pressure and speed. Since the vertical direction of the injection cavity is along the length direction of the target part, the plasticized plastic is injected and molded from bottom to top along the length direction of the target part, which helps the target part to maintain concentricity better.

[0008] On the other hand, by directly setting cooling coils inside a pair of sliders, compared with the cooling methods in the prior art, the cooling coils are closer to the injection cavity, bringing the target part closer to the core temperature zone. This allows for faster and more accurate control of the injection environment temperature and facilitates rapid cooling of the target part after injection molding, reducing deformation and bending. Furthermore, the cooling coils extend and bend reciprocally relative to the groove inside the sliders, creating heat source points at multiple length positions and left and right positions within the injection cavity. This further improves the control effect on the injection environment temperature and helps improve the injection precision of the target part, such as the concentricity of the shared ejector arm.

[0009] For example, one slider has a plurality of first limiting portions on its inner wall, and the other slider has a plurality of second limiting portions on its inner wall that are respectively inserted into and limited by the plurality of first limiting portions, thereby restricting the misalignment of the opposing surfaces of the two sliders. This allows the pair of sliders to better complete mold closing, which is beneficial for maintaining the finished product effect of the injection molded target part.

[0010] Preferably, the cooling coil can be embedded inside the slider during the 3D printing process. Thus, for the slider with an internal cooling coil in this embodiment, the slider's forming efficiency is also higher.

[0011] In a preferred embodiment of the injection mold provided in the above embodiments, the injection mold further includes at least one air needle, which passes through one of the sliders and connects the mold cavity to the outside for venting; one air needle is located in the middle of the mold cavity along its length, and another air needle is located at a lower position along the length of the mold cavity. Thus, the upper part of the injection cavity is not closed and has a venting function, while in the early stage of injection molding, the air in the lower part of the injection cavity can be discharged more smoothly and quickly through the air needles, thereby meeting the requirement of faster plastic injection.

[0012] In a preferred embodiment of the injection mold provided in the above embodiments, the injection mold further includes multiple sealing rings. One sealing ring is disposed between the liquid inlet section of the cooling coil and the slider, and another sealing ring is disposed between the liquid outlet section of the cooling coil and the slider. This seals the cooling coil and the slider, preventing impurities from entering the slider and affecting its performance.

[0013] In a preferred embodiment of the injection mold provided in the above embodiments, the cooling coil may include multiple transverse segments that spatially intersect the mold groove. These transverse segments are sequentially connected, allowing the cooling coil to extend and bend reciprocally relative to the mold groove inside the slider. Each transverse segment has a first recessed portion at its position opposite the mold groove, ensuring that the cooling coil maintains a similar or equal distance from the inner wall of the slider at all points. This results in a more uniform temperature across the inner wall of the slider, avoiding significant temperature differences and facilitating better control of the injection environment temperature during the injection molding process.

[0014] In a preferred embodiment of the injection mold provided in the above embodiments, the target part may also have an accessory connected to its rod-shaped body. In this case, the distance between two adjacent transverse segments of the accessory is smaller than the distance between other transverse segments. This allows for a better injection molding environment temperature for the accessory.

[0015] For example, the accessory may include a retaining ring with different diameters at its two ends. In this case, a groove is formed at each of the axial ends of the retaining ring between the mating inner walls of the two sliders. The mold also includes two insert pins, which are respectively disposed in the corresponding grooves at the axial ends of the retaining ring. The inner wall of the injection cavity at the corresponding position is used for forming the outer wall of the retaining ring. Preferably, each transverse segment has a second recess formed at the position directly opposite the groove. Similar to the purpose of the first recess, it is also to make the temperature of each part of the inner wall of the slider more similar, thereby providing the required ambient temperature for each part of the target part.

[0016] Furthermore, the injection mold may also include an upper mold core, a lower mold core, and two locking blocks. The upper and lower mold cores are both disposed outside the pair of sliders and located on opposite sides of the target part's length direction. The upper and lower mold cores each have multiple cooling channels formed inside them, extending in a direction perpendicular to the length direction of the target part. In other words, during mold closing, the pair of sliders are engaged in the left-right direction, and the upper and lower mold cores are engaged in the up-down direction.

[0017] Preferably, the injection mold may further include multiple cooling straight pipes, each of which passes through one of the cooling channels. For example, the multiple cooling straight pipes can be connected by a connecting pipe, with one cooling straight pipe having an inlet at its end and another having an outlet at its end. Thus, the cooling coils in the left and right sliders serve as the inner cooling system, while the cooling straight pipes in the upper and lower mold cores serve as the outer cooling system, ensuring that the entire mold remains at a consistently stable ambient temperature.

[0018] Two locking blocks are respectively positioned between the left and right sides of the upper mold core and the lower mold core, with the upper and lower ends of one locking block inserted into the upper and lower mold cores respectively, to restrict the relative movement of the pair of sliders in the left-right direction. Thus, during injection molding, the molten plastic exerts pressure on the two sliders. By utilizing the cooperation of the upper mold core, lower mold core, and the two locking blocks, the left-right movement of the two sliders can be restricted, thereby facilitating the injection molding of the target part.

[0019] In a preferred embodiment of the injection mold provided in the above embodiments, each locking block is provided with two ports for the inlet and outlet sections of the cooling coil on the corresponding side to extend to the outside, thereby providing a channel for connecting the cooling coil to an external temperature control box. Preferably, the extension direction of the cooling straight pipe is along the extension direction of the inlet and outlet sections. The two cooling coils are arranged side by side, while multiple cooling straight pipes extend from left to right, spatially intersecting in the temperature control area, thereby providing a more reliable ambient temperature for the injection molding of the target part. Simultaneously, since the cooling coil and cooling straight pipe extend from the same side of the injection mold, it also facilitates the connection between the external temperature control box and the cooling coil and cooling straight pipe, thereby controlling the injection molding ambient temperature.

[0020] In a preferred embodiment of the injection mold provided in the above embodiments, the injection mold further includes an upper heat insulation plate and a lower heat insulation plate. The upper heat insulation plate is disposed above the upper mold core, and the lower heat insulation plate is disposed below the lower mold core. The upper and lower heat insulation plates serve to insulate the mold and reduce the influence of the external ambient temperature on the internal temperature of the injection mold.

[0021] In a preferred embodiment of the injection mold provided in the above embodiments, the injection mold further includes an upper positioning block and a lower positioning block. The upper positioning block is connected to the upper heat insulation plate and used to fix it to one end of the injection molding machine, and the lower positioning block is connected to the lower heat insulation plate and used to fix it to the other end of the injection molding machine, so as to facilitate the injection molding machine to fix and operate the injection mold. In addition, the injection mold may also include an ejection mechanism for ejecting the molded target part from the mold, which is generally controlled by a hydraulic cylinder installed on the injection molding machine. Attached Figure Description

[0022] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which will make the above and other features and advantages of the present invention more apparent to those skilled in the art. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the injection mold provided in this embodiment.

[0024] Figure 2 This is a structural diagram of the target part and the insert.

[0025] Figure 3 for Figure 1 The diagram shows the structure of the slider in an injection mold.

[0026] Figure 4 for Figure 1 A schematic diagram showing the positional relationship between the cooling coil and the cooling straight pipe in a medium-sized injection mold.

[0027] The reference numerals in the attached figures are as follows:

[0028] 1-Target part; 11-Ring-shaped main body; 12-Accessories;

[0029] 2-Slider; 21-Groove; 22-Insertion; 221-Insertion pin; 23-First limiting part;

[0030] 3-cooling coil; 31-transverse section; 311-first recess; 312-second recess; 32-liquid inlet section; 33-liquid outlet section;

[0031] 34 - Sealing ring;

[0032] 41-Injection tubing; 42-Air needle;

[0033] 51-Upper mold core; 52-Lower mold core; 501-Cooling channel; 502-Cooling straight pipe; 53-Locking block; 531-Pipe opening; 54-Base;

[0034] 61 - Upper heat insulation plate; 62 - Lower heat insulation plate;

[0035] 71 - Upper template; 72 - Lower template;

[0036] 81-Upper positioning block;

[0037] 9-Top ejection mechanism. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, the following embodiments are provided to further illustrate the present invention in detail.

[0039] An injection molding machine is a device that uses the thrust of a screw (or plunger) to inject pre-plasticized molten plastic (i.e., viscous flow state) into a closed mold cavity, and obtains the finished product after solidification and shaping. This embodiment proposes an injection mold to ensure the effective control of the injection environment temperature during the injection molding process of a shared release arm, thereby improving the product accuracy of the shared release arm.

[0040] like Figure 1 As shown, the upper part of the injection mold includes an upper positioning block 81, an upper template 71, and an upper mold core 51 assembled together, and the lower part of the injection mold includes a lower positioning block, a lower template 72, and a lower mold core 52 assembled together. The upper positioning block 81 and the lower positioning block are respectively connected to the injection molding machine to facilitate the fixing of the injection molding machine to the injection mold and to control the mold closing and opening operations. In addition, the injection molding machine also includes an ejection mechanism 9, which is used to eject the molded target part 1 from the mold, and is generally controlled by a hydraulic cylinder installed on the injection molding machine. It should be noted that the ejection mechanism 9 is not the focus of the protection of this invention, and therefore will not be described in detail here.

[0041] The injection mold provided in this embodiment is used for injection molding of a target part 1 with a rod-shaped main body, as shown in the figure. Figure 2 The target part 1 includes a rod-shaped body 11. (Refer to...) Figures 1 to 3 A pair of sliders 2 are also provided in the space between the upper mold core 51 and the lower mold core 52. During mold closing, the upper mold core 51 and the lower mold core 52 separate vertically, while the pair of sliders 2 separate horizontally. Figure 3 There is also a glue injection line 41 extending into the interior of the pair of sliders 2, and a cooling coil 3 is provided inside each of the two sliders 2.

[0042] In this pair of sliders 2, the inner walls of the two sliders 2 that fit together are respectively formed with grooves 21 that are adapted to one side of the target part 1. After the two sliders 2 are fitted together, the grooves 21 on both sides form the injection cavity of the target part 1, and the vertical direction of the injection cavity is along the length direction of the target part 1. One end of the injection pipe 41 extends into the interior of the pair of sliders 2 and communicates with the grooves 21, for example, with the injection cavity, while the other end extends out of the pair of sliders 2.

[0043] During the injection molding process, the injection system of the injection molding machine heats and plasticizes the plastic and injects it into the injection cavity formed between a pair of sliders 2 through the injection pipe 41 at a certain pressure and speed. Since the vertical direction of the injection cavity is along the length direction of the target part 1, the plasticized plastic is injected and molded from bottom to top along the length direction of the target part 1, which helps to better maintain the concentricity of the rod-shaped target part 1.

[0044] Reference Figure 3 Two cooling coils 3 are respectively disposed inside the two sliders 2. The inlet section 32 and outlet section 33 of the cooling coils 3 are both exposed outside the sliders 2, and the cooling coils 3 extend and bend reciprocally relative to the groove 21 inside the sliders 2. These cooling coils 3 can be embedded inside the sliders 2 during the 3D printing process, and for sliders 2 with internal cooling coils 3, this is also an effective way to form the sliders 2 themselves. For example, the cooling coils 3 can be... Figure 3 The three-dimensional annular waterway shown in the image.

[0045] During injection molding, the circulation pipes of the temperature control box are connected to the cooling coils 3 inside the two sliders 2 respectively. By maintaining the temperature of the coolant in the inlet section 32 and outlet section 33 of the cooling coils 3, the ambient temperature required for the injection molding process is maintained. Compared with the cooling method in the prior art, the above embodiment directly sets a cooling coil 3 inside each pair of sliders 2. The distance between the cooling coils 3 and the injection cavity is closer, allowing the target part 1 to be close to the core temperature zone. This enables faster and more accurate control of the injection environment temperature and facilitates rapid cooling of the target part 1 after injection molding, reducing deformation and bending. In addition, the cooling coils 3 extend and bend back and forth relative to the groove 21 inside the slider 2, forming heat source points at multiple length positions and left and right positions in the injection cavity. This further improves the control effect of the injection environment temperature and helps to improve the injection accuracy of the target part 1, such as the concentricity of the shared ejector arm.

[0046] As can be seen from the above scheme, the injection mold provided by the present invention can be used for injection molding of the common release arm of the circuit breaker, and after adaptive adjustment of the shape and structure of the groove 21 on the slider 2, it can also be used for injection molding of other target parts 1 with rod-shaped main bodies.

[0047] In a preferred embodiment of the injection mold provided in the above embodiments, refer to... Figure 3The cooling coil 3 may include multiple horizontal segments 31 that intersect the groove 21 in space. The multiple horizontal segments 31 are connected sequentially so that the cooling coil 3 extends and bends back and forth relative to the groove 21 inside the slider 2. It should be noted that the reciprocating bending extension of the cooling coil 3 is not limited to this. For example, the cooling coil 3 may extend in a ring shape, or the cooling coil 3 may be formed by multiple vertical segments connected sequentially.

[0048] Continuing with the example of the cooling coil 3 comprising multiple horizontal sections 31, each horizontal section 31 has a first recess 311 formed at the position directly opposite the groove 21, so that the distance between each part of the cooling coil 3 and the inner wall of the slider 2 is similar or the same, so that the temperature of each part of the inner wall of the slider 2 is similar, avoiding the problem of large temperature differences, thereby facilitating better control of the injection environment temperature during the injection molding process.

[0049] In a preferred embodiment of the injection mold provided in the above embodiments, combined with Figure 2 and Figure 3 The target part 1 may also have an accessory 12 connected to its rod-shaped body 11. In this case, the spacing between two adjacent transverse segments 31 of the accessory 12 can be smaller than the spacing between other transverse segments 31. This can provide a better injection molding environment temperature for the accessory 12.

[0050] Continue to refer to Figure 2 and Figure 3 In the shared release arm, the accessory 12 may include a retaining ring with different diameters at its two ends. In this case, a groove 22 is formed at each of the axial ends of the retaining ring between the inner walls of the two sliding blocks 2. The mold also includes two insert pins 221, which are respectively disposed in the corresponding grooves 22 at the axial ends of the retaining ring. The inner wall of the injection cavity at the corresponding position is used for forming the outer wall of the retaining ring. Preferably, each transverse segment 31 has a second recess 312 formed at the position directly opposite the groove 22. Similar to the purpose of the first recess 311, it is also to make the temperature of each part of the inner wall of the sliding block 2 similar, thereby providing the required ambient temperature for each part of the target part 1.

[0051] In a preferred embodiment of the injection mold provided in the above embodiments, refer to... Figure 3The injection mold also includes at least one air needle 42, which passes through a slider 2 and connects the mold cavity 21 to the outside for venting. One air needle 42 is located in the middle of the mold cavity 21 along its length, and the other air needle 42 is located at a lower position along the length of the mold cavity 21. Thus, the upper part of the injection cavity is not closed and has a venting function. In the early stages of injection molding, the air in the lower part of the injection cavity can be discharged more smoothly and quickly through the multiple air needles 42, meeting the requirement for faster plastic injection.

[0052] In a preferred embodiment of the injection mold provided in the above embodiments, refer to... Figure 3 The injection mold also includes multiple sealing rings 34. One sealing ring 34 is disposed between the liquid inlet section 32 of the cooling coil 3 and the slider 2, and another sealing ring 34 is disposed between the liquid outlet section 33 of the cooling coil 3 and the slider 2. In this way, the cooling coil 3 and the slider 2 can be sealed, preventing impurities from entering the slider 2 and affecting its performance.

[0053] like Figure 1 As shown, the injection mold may further include an upper mold core 51, a lower mold core 52, and two locking blocks 53. The upper mold core 51 and lower mold core 52 are both disposed outside a pair of sliders 2 and are located on opposite sides of the target part 1 along its length. Multiple cooling channels 501 are formed inside the upper mold core 51 and lower mold core 52, extending in a direction perpendicular to the length of the target part 1. In other words, during mold closing, the pair of sliders 2 are engaged in the left-right direction, and the upper mold core 51 and lower mold core 52 are engaged in the up-down direction.

[0054] Preferably, the injection mold may further include multiple cooling straight pipes 502, each of which passes through a cooling channel 501. For example, the multiple cooling straight pipes 502 can be connected by a connecting pipe, with the end of one cooling straight pipe 502 forming a liquid inlet and the end of another cooling straight pipe 502 forming a liquid outlet. Thus, the cooling coils 3 respectively provided in the left and right sliders 2 serve as the inner cooling system, while the cooling straight pipes 502 provided in the upper mold core 51 and lower mold core 52 serve as the outer cooling system, ensuring that the injection mold as a whole remains at a consistently stable ambient temperature.

[0055] Preferably, combined with Figure 1 , Figure 3 and Figure 4The extension direction of the cooling straight pipe 502 follows the extension direction of the liquid inlet section 32 and the liquid outlet section 33 of the cooling coil 3. The two cooling coils 3 are arranged side by side, while multiple cooling straight pipes 502 extend from left to right, spatially intersecting in the temperature control area, thereby providing a more reliable ambient temperature for the injection molding of the target part 1. At the same time, since the cooling coil 3 and the cooling straight pipe 502 extend from the same side of the injection mold, it is also convenient for the external temperature control box to connect with the cooling coil 3 and the cooling straight pipe 502, thereby controlling the injection molding ambient temperature.

[0056] Continue to refer to Figure 3 One slider 2 has multiple first limiting parts 23 on its inner wall, and the other slider 2 has multiple second limiting parts on its inner wall that are respectively inserted into and limited by the multiple first limiting parts 23, so as to restrict the misalignment of the opposite surfaces of the two sliders 2 during injection molding. In this way, the pair of sliders 2 can better complete mold closing, which is beneficial to maintaining the finished product effect of the injection molded target part 1.

[0057] exist Figure 1 In this design, two locking blocks 53 are respectively positioned between the left and right sides of the upper mold core 51 and the lower mold core 52, with the upper and lower ends of one locking block 53 inserted into the upper mold core 51 and the lower mold core 52 respectively, to restrict the relative movement of a pair of sliders 2 in the left-right direction. Thus, during injection molding, the molten plastic exerts pressure on the two sliders 2. By utilizing the cooperation of the upper mold core 51, the lower mold core 52, and the two locking blocks 53, the movement of the two sliders 2 in the left-right direction can be restricted, thereby facilitating the injection molding of the target part 1. It should be noted that, from... Figure 1 As can be seen, a base 54 and other structures are also provided between the locking block 53 and the slider 2. Since they are not related to the focus of this invention, they will not be described in detail. Those skilled in the art can fully implement the content of this invention by referring to the accompanying drawings and the description of this embodiment.

[0058] In a preferred embodiment of the injection mold provided in the above embodiments, refer to... Figure 1 Each locking block 53 is provided with two ports 531, allowing the inlet section 32 and outlet section 33 of the cooling coil 3 on the corresponding side to extend to the outside, thereby providing a channel for the cooling coil 3 to connect with the external temperature control box. It can be seen that the locking block 53, in addition to preventing the slider 2 from moving left and right during the injection molding process, also serves as a channel for the cooling coil 3 to connect with the external temperature control box.

[0059] In a preferred embodiment of the injection mold provided in the above embodiments, refer to... Figure 1The injection mold also includes an upper heat insulation plate 61 and a lower heat insulation plate 62. The upper heat insulation plate 61 is positioned above the upper mold core 51, while the lower heat insulation plate 62 is positioned below the lower mold core 52. The upper and lower heat insulation plates 61 and 62 serve to insulate the mold and reduce the influence of ambient temperature on the internal temperature of the injection mold. Figure 1 In the injection mold shown, an upper positioning block 81 is provided above the upper heat insulation plate 61, and a lower positioning block is provided below the lower heat insulation plate 62.

[0060] This invention relates to the field of equipment manufacturing, and in particular to an injection mold for a common trip arm of a circuit breaker. The injection mold is used for injection molding a target part 1 with a rod-shaped main body. The mold includes a pair of sliders 2, an injection line 41 extending into the pair of sliders 2 at one end, and cooling coils 3 respectively disposed inside the two sliders 2. Because the vertical direction of the injection cavity is along the length direction of the target part 1, and the cooling coils 3 are closer to the injection cavity, the target part 1 is brought closer to the core temperature zone, which facilitates rapid cooling of the target part 1 after injection molding, reduces deformation and bending, and improves the injection molding accuracy of the target part 1, such as the concentricity of the common trip arm.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An injection mold for injection molding a target part (1) whose main body is rod-shaped, characterized in that, The injection mold includes: A pair of sliders (2), the inner walls of the two sliders (2) are respectively formed with grooves (21) that are adapted to one side of the target part (1), and the grooves (21) on both sides after the two sliders (2) are fitted together form the injection cavity of the target part (1), and the vertical direction of the injection cavity is along the length direction of the target part (1). An injection line (41) has one end inserted into the interior of the pair of sliders (2) and communicating with the injection cavity, while the other end extends out of the outside of the pair of sliders (2); Two cooling coils (3) are respectively installed inside the two sliders (2). The liquid inlet section (32) and liquid outlet section (33) of the cooling coils (3) are exposed outside the sliders (2), and the cooling coils (3) extend reciprocally inside the sliders (2) relative to the groove (21). The cooling coil (3) includes a plurality of horizontal segments (31) that intersect the groove (21) in space. The plurality of horizontal segments (31) are connected sequentially, and each horizontal segment (31) has a first recess (311) formed at a position directly opposite the groove (21) so that the cooling coil maintains the same distance relative to the inner wall of the slider at all points. Furthermore, the injection mold further includes: The upper mold core (51) and the lower mold core (52) are disposed outside the pair of sliders (2) and are located on both sides of the length direction of the target part (1). The upper mold core (51) and the lower mold core (52) are respectively formed with multiple cooling channels (501), which are arranged to extend in a direction perpendicular to the length direction of the target part (1). Multiple cooling straight pipes (502), each of the cooling straight pipes (502) is arranged to pass through one of the cooling channels (501); Two locking blocks (53) are respectively disposed between the left and right sides of the upper mold core (51) and the lower mold core (52), and the upper and lower ends of one of the locking blocks (53) are respectively inserted into the upper mold core (51) and the lower mold core (52) to restrict the relative movement of the pair of sliders (2) in the left and right directions.

2. The injection mold according to claim 1, characterized in that, When the target part (1) is also connected to an accessory (12) on its rod-shaped body (11), the spacing between two adjacent transverse segments (31) of the accessory (12) is smaller than the spacing between other transverse segments (31).

3. The injection mold according to claim 2, characterized in that, The accessory (12) includes a retaining ring with different diameters at both ends. A groove (22) is formed at each of the axial ends of the retaining ring between the inner walls of the two sliding blocks (2). The mold also includes: Two insert pins (221) are respectively set in the insert grooves (22) at both ends of the axial direction of the retaining ring; Each transverse segment (31) has a second recess (312) formed at the position directly opposite the groove (22).

4. The injection mold according to claim 1, characterized in that, Each of the locking blocks (53) is provided with two ports (531) for the liquid inlet section (32) and liquid outlet section (33) of the cooling coil (3) on the corresponding side to extend to the outside; The extension direction of the cooling straight pipe is along the extension direction of the liquid inlet section (32) and the liquid outlet section (33).

5. The injection mold according to claim 1, characterized in that, Also includes: An upper heat insulation plate (61) is disposed above the upper mold core (51); A lower heat insulation plate (62) is disposed below the lower mold core (52).

6. The injection mold according to claim 5, characterized in that, Also includes: An upper positioning block (81) is attached to the upper heat insulation plate (61) and used to fix it to one end of the injection molding machine; A lower positioning block is attached below the lower heat insulation plate (62) and used to fix it to the other end of the injection molding machine.

7. The injection mold according to claim 1, characterized in that, The cooling coil (3) is embedded inside the slider (2) during the 3D printing process; and / or, One of the sliders (2) has a plurality of first limiting parts (23) on its inner wall, and the other slider (2) has a plurality of second limiting parts that are respectively inserted into and limited by the plurality of first limiting parts (23) to restrict the misalignment of the opposite surfaces of the two sliders (2).

8. The injection mold according to claim 1, characterized in that, Also includes: At least two air needles (42) are provided, which pass through one of the sliders (2) and connect the groove (21) to the outside for exhaust. One air needle (42) is located in the middle of the groove (21) along its length, and the other air needle (42) is located at a lower position along the length of the groove (21); and / or, Multiple sealing rings (34) are provided, one of which is located between the liquid inlet section (32) of the cooling coil (3) and the slider (2), and the other is located between the liquid outlet section (33) of the cooling coil (3) and the slider (2).

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