Undercut demoulding mechanism and injection mold

Abstract

The present application provides an undercut demoulding mechanism and an injection mold, wherein the undercut demoulding mechanism comprises an inclined ejector block, an ejector rod and a guide rod, wherein the inclined ejector block is provided with a first connection portion and a guide bevel groove, and the ejector rod is provided with a second connection portion, wherein the second connection portion and the first connection portion are slidably matched, and the guide rod and the guide bevel groove are slidably matched; the ejector rod is used to drive the inclined ejector block to move relative to the guide rod when moving along the mold opening and closing direction, so that the guide bevel groove and the guide rod abut against each other, thereby making the inclined ejector block slide relative to the ejector rod along the stripping direction having an angle with the mold opening and closing direction. The undercut demoulding mechanism has a simple and reasonable structure, requires a small space when arranged in the mold, occupies a small space, is conducive to the lightweight and miniaturized design of the mold, and reduces the mold manufacturing cost.

Description

Technical Field

[0001] The invention relates to the field of molds, and in particular to an undercut demoulding mechanism and an injection mold. Background Art

[0002] The inclined ejector is a mechanism used in mold design to form an internal undercut of a molded product. When an undercut appears on the inner surface of the side wall of a product, it is very effective to use an inclined ejector to determine the direction of the undercut. During ejection, the inclined ejector moves vertically and horizontally relative to the product at the same time, thereby releasing the product. At present, the inclined ejector is pushed forward at a certain angle. After a certain distance forward, it moves horizontally relative to the product at the same time, thereby releasing the product. The undercut position of the product is no longer in contact with the inner side of the plastic, so that the product can be removed smoothly.

[0003] Research has found that the existing undercut demoulding mechanism has the following disadvantages:

[0004] It takes up a lot of mold space and increases mold manufacturing costs. Summary of the invention

[0005] The object of the present invention is to provide an undercut demoulding mechanism and an injection mold, which can reduce the space required for installation, occupy a small mold space, and reduce the mold manufacturing cost.

[0006] The embodiment of the present invention is achieved as follows:

[0007] In a first aspect, the present invention provides an undercut demoulding mechanism, comprising:

[0008] An inclined ejector block, an ejector rod and a guide rod, wherein the inclined ejector block is provided with a first connection portion and a guide inclined groove, the ejector rod is provided with a second connection portion, the second connection portion is slidably matched with the first connection portion, and the guide rod is slidably matched with the guide inclined groove;

[0009] The ejector rod is used to drive the inclined ejector block to move relative to the guide rod when moving along the mold opening and closing direction, so that the guide inclined groove abuts against the guide rod, thereby causing the inclined ejector block to slide relative to the ejector rod along a release direction having an angle with the mold opening and closing direction.

[0010] In an optional embodiment, the guide rod includes a connected supporting sub-rod and a guiding sub-rod, the top rod and the supporting sub-rod extend in the same direction, the guiding sub-rod and the supporting sub-rod have an included angle, and the guiding sub-rod is slidably matched with the guiding inclined groove.

[0011] In an optional embodiment, the inclined top block is provided with a slide groove, the guide inclined groove includes two groove sections located on both sides of the slide groove, the supporting branch rod is slidably matched with the slide groove, and the guide branch rod is slidably matched with the two groove sections at the same time.

[0012] In an optional embodiment, the undercut demolding mechanism also includes a first driving member, a first ejector plate, a second driving member and a second ejector plate, the ejector rod is connected to the first ejector plate, the first driving member is connected to the first ejector plate and is used to drive the first ejector plate to move in the mold opening and closing direction; the supporting rod is connected to the second ejector plate, the second driving member is connected to the second ejector plate and is used to drive the second ejector plate to move in the mold opening and closing direction.

[0013] In an optional embodiment, the first driving member is connected to the first ejector plate, the first ejector plate cooperates with the second ejector plate, and the second ejector plate is used to drive the first ejector plate to move.

[0014] In an optional embodiment, at least one of the top rod and the supporting sub-rod is provided with a sliding sleeve.

[0015] In an optional embodiment, the inclined ejector block is provided with a buffer groove connected to the guide inclined groove, and the guide rod and the buffer groove are slidably matched in the mold opening and closing direction.

[0016] In an optional embodiment, the guide inclined groove has a first groove wall and a second groove wall arranged opposite to each other, and the first groove wall is used to abut against the guide rod when the ejector rod drives the inclined ejector block to move in the mold opening direction, so as to drive the inclined ejector block to move in the release direction relative to the ejector rod;

[0017] The second groove wall is used to abut against the guide rod when the ejector rod drives the inclined ejector block to move in the mold closing direction, so as to drive the inclined ejector block to move in the reset direction opposite to the release direction relative to the ejector rod; the mold opening direction is opposite to the mold closing direction.

[0018] In an optional embodiment, the first connecting portion and the second connecting portion are mutually matching dovetail groove structures or "T"-shaped groove structures.

[0019] In a second aspect, the present invention provides an injection mold, the injection mold comprising:

[0020] The fixed mold, the movable mold and the undercut demoulding mechanism of any one of the above embodiments, the fixed mold and the movable mold are slidably matched along the mold opening and closing direction, and the ejector rod is arranged on the fixed mold and extends along the mold opening and closing direction.

[0021] The beneficial effects of the embodiments of the present invention are:

[0022] In summary, the undercut demoulding mechanism provided in this embodiment has a push rod and an inclined ejector block that are slidably matched, and the inclined ejector block is provided with a guide bevel groove that is slidably matched with the guide rod. When the undercut demoulding mechanism is assembled into the mold, the push rod can extend along the opening and closing direction of the mold. Compared with the traditional obliquely arranged rod for ejecting the inclined ejector, the push rod provided in this embodiment is arranged vertically, which occupies less space, saves the internal space of the mold, is conducive to the compact design of the mold, reduces the overall volume of the mold, and reduces the manufacturing cost of the mold. At the same time, the push rod can drive the inclined ejector block to move along the opening and closing direction of the mold. When the inclined ejector block moves, the guide bevel groove provided on it can abut against the guide rod. Under the limiting action of the guide rod, the inclined ejector block moves along the release direction that has an angle with the opening and closing direction. That is, the inclined ejector block can make a lateral movement under the cooperation of the guide rod and the guide bevel groove, so as to be disengaged from the undercut of the product, which is convenient for demoulding the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of the undercut demoulding mechanism from one perspective of an embodiment of the present invention (mold closing state);

[0025] Figure 2 It is a structural schematic diagram of the undercut demoulding mechanism from another perspective of an embodiment of the present invention (mold closing state);

[0026] Figure 3 A schematic diagram of the motion trajectory of the lift block during the demoulding process of an embodiment of the present invention;

[0027] Figure 4 A schematic structural diagram of a tilted lift block from one perspective of an embodiment of the present invention;

[0028] Figure 5 A schematic structural diagram of a tilted lift block from another perspective of an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the structure of a push rod according to an embodiment of the present invention;

[0030] Figure 7 Schematic diagram of the structure of the guide rod according to an embodiment of the present invention.

[0031] icon:

[0032] 100- inclined ejector block; 101- first side; 102- second side; 110- first connecting portion; 120- guiding inclined groove; 121- first groove wall; 122- second groove wall; 130- buffer groove; 140- slide groove; 150- operating through hole; 200- ejector rod; 210- second connecting portion; 300- guide rod; 310- supporting branch rod; 320- guide branch rod; 400- first ejector pin plate; 500- second ejector pin plate; 600- sliding sleeve. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invention product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] See also Figure 1-Figure 7 The present embodiment provides an undercut demoulding mechanism, which is used to demould the undercut position of the product when taking out the product after injection molding. The undercut demoulding mechanism has a reasonable structure, a small size, and occupies a small space, thereby reducing the volume of the mold and utilizing the miniaturized and lightweight design of the mold.

[0040] See also Figure 1 and Figure 2 In this embodiment, the undercut demoulding mechanism includes:

[0041] The inclined ejector block 100, the ejector rod 200 and the guide rod 300, the inclined ejector block 100 is provided with a first connecting portion 110 and a guide inclined groove 120, the ejector rod 200 is provided with a second connecting portion 210, the second connecting portion 210 is slidably matched with the first connecting portion 110, and the guide rod 300 is slidably matched with the guide inclined groove 120;

[0042] The ejector pin 200 is used to drive the inclined ejector block 100 to move relative to the guide rod 300 when moving along the mold opening and closing direction, so that the guide bevel groove 120 abuts against the guide rod 300, thereby allowing the inclined ejector block 100 to slide relative to the ejector pin 200 along a release direction having an angle with the mold opening and closing direction.

[0043] The undercut demoulding mechanism provided in this embodiment has a push rod 200 that is slidably matched with the inclined ejector block 100, and the inclined ejector block 100 is provided with a guide inclined groove 120 that is slidably matched with the guide rod 300. When the undercut demoulding mechanism is assembled into the mold, the push rod 200 can extend along the opening and closing direction of the mold. Compared with the traditional obliquely arranged rod for ejecting the inclined ejector, the push rod 200 provided in this embodiment is arranged vertically, occupies less space, saves the internal space of the mold, is conducive to the compact design of the mold, reduces the overall volume of the mold, and reduces the manufacturing cost of the mold. At the same time, the ejector rod 200 can drive the inclined ejector block 100 to move along the opening and closing direction of the mold. When the inclined ejector block 100 moves, the guide bevel groove 120 arranged thereon can abut against the guide rod 300. Under the limiting action of the guide rod 300, the inclined ejector block 100 moves along the disengagement direction having an angle with the opening and closing direction. That is, the inclined ejector block 100 can make lateral movement under the cooperation of the guide rod 300 and the guide bevel groove 120, thereby disengaging from the undercut of the product and realizing the undercut demolding of the product.

[0044] See also Figure 4 and Figure 5 In this embodiment, optionally, the inclined ejector block 100 has a molding portion for molding the product, and the molding portion forms an undercut structure after contacting the product. The molding portion needs to be moved from the side relative to the product to achieve demoulding.

[0045] Optionally, the inclined ejector block 100 is provided with a first side 101 and a second side 102 which are opposite to each other in the mold opening and closing direction, and a slide groove 140 is provided on the first side 101. The slide groove 140 extends from the first side 101 to the direction of the second side 102. There is a spacing between the slide groove 140 and the second side 102, and an operating through hole 150 extending to the second side 102 is provided at the bottom of the slide groove 140.

[0046] Optionally, the first connection portion 110 is disposed on the first side 101, and the first connection portion 110 extends in a direction having an angle with the slide slot 140, for example, the first connection portion 110 extends in an extending direction perpendicular to the slide slot 140. The first connection portion 110 may be a groove, for example, the first connection portion 110 is a dovetail groove or a "T"-shaped groove, etc. Obviously, in other embodiments, the first connection portion 110 may also be a protrusion.

[0047] Optionally, the guide chute 120 is located between the first side 101 and the second side 102, and at the same time, the two ends of the guide chute 120 in the extension direction thereof have a spacing in the extension direction of the first connecting portion 110, that is, the guide chute 120 has a proximal end close to the first side 101 and a distal end close to the second side 102, and the distal end deviates from the proximal end in the extension direction of the first connecting portion 110. The proximal end is a closed end, and the distal end is connected to the buffer groove 130. The buffer groove 130 extends along the extension direction of the slide groove 140, that is, the buffer groove 130 is arranged parallel to the slide groove 140. At the same time, one end of the buffer groove 130 away from the guide chute 120 has a spacing with the second side 102, that is, one end of the buffer groove 130 away from the guide chute 120 is a closed end. In this way, when the guide rod 300 slides in the guide bevel groove 120 and the slide groove 140 along the mold opening and closing direction, it will not disengage from the guide bevel groove 120 and the slide groove 140. At the same time, when the guide rod 300 abuts against the closed end of the guide bevel groove 120, the guide rod 300 can limit the inclined lift block 100 from continuing to move in the mold opening direction. When the guide rod 300 abuts against the closed end of the slide groove 140, the guide rod 300 can limit the inclined lift block 100 from continuing to move in the mold closing direction.

[0048] Furthermore, the guiding bevel groove 120 has a first groove wall 121 and a second groove wall 122 which are relatively arranged in the extension direction of the first connecting portion 110. When the inclined ejector block 100 moves along the mold opening direction and the guide rod 300 is located in the guiding bevel groove 120, the guide rod 300 abuts against the first groove wall 121 to drive the inclined ejector block 100 to move in the disengaging direction relative to the ejector rod 200; when the inclined ejector block 100 moves in the mold closing direction driven by the ejector rod 200 and the guide rod 300 is located in the guiding bevel groove 120, the guide rod 300 abuts against the second groove wall 122 to drive the inclined ejector block 100 to move in the resetting direction opposite to the disengaging direction relative to the ejector rod 200, so as to facilitate the injection molding of the new product.

[0049] It should be noted that the guide rod 300 can abut against the first groove wall 121 and the second groove wall 122 at the same time, thereby improving the control accuracy.

[0050] Optionally, two guide bevel grooves 120 are provided, and the two guide bevel grooves 120 are located on both sides of the slide groove 140 and are symmetrically arranged. The two guide bevel grooves 120 are both connected to the slide groove 140, and the guide rod 300 is slidably matched with the two guide bevel grooves 120 at the same time.

[0051] Alternatively, in other embodiments, the guide bevel 120 includes two groove sections located on both sides of the slide groove 140 and symmetrically arranged, and the guide rod 300 is slidably engaged with the two groove sections at the same time, and each groove section has an angle with the extension direction of the slide groove 140.

[0052] In this embodiment, it is set that when the undercut demolding mechanism is assembled into the mold, the extension direction of the slide groove 140 is parallel to the opening and closing direction of the mold, and the extension direction of the guide bevel 120 or the extension direction of each groove section of the guide bevel 120 has an angle with the extension direction of the slide groove 140, that is, the guide bevel 120 is inclined relative to the slide groove 140.

[0053] See also Figure 6 In this embodiment, optionally, the end of the ejector pin 200 is provided with a second connection portion 210. When the first connection portion 110 is provided as a groove, the second connection portion 210 is provided as a protrusion matched with the first connection portion 110, for example, a dovetail protrusion or a "T"-shaped protrusion, etc.; when the first connection portion 110 is provided as a protrusion, the second connection portion 210 is provided as a groove matched with the first connection portion 110. The first connection portion 110 and the second connection portion 210 are slidably matched, and the two are relatively fixed in the extension direction of the ejector pin 200, that is, when the ejector pin 200 moves in the mold opening and closing direction, it will not be separated from the inclined ejector block 100, so that the ejector pin 200 can drive the inclined ejector block 100 to move synchronously when moving in the mold opening and closing direction.

[0054] It should be noted that the second connecting portion 210 can be a part of the top rod 200, that is, the second connecting portion 210 is formed after the top rod 200 is processed, or the second connecting portion 210 and the main body of the top rod 200 are separate structures, and the main body and the second connecting portion 210 are processed separately and then fixed together.

[0055] See also Figure 7 In this embodiment, optionally, the guide rod 300 includes a connected supporting sub-rod 310 and a guiding sub-rod 320, and the supporting sub-rod 310 and the guiding sub-rod 320 can be fixedly connected by screws. During operation, the guiding sub-rod 320 is directly inserted into the two buffer grooves 130 at the same time, and the supporting sub-rod 310 is inserted into the slide groove 140. The screws are screwed onto the guiding sub-rod 320 and the supporting sub-rod 310 by utilizing the space provided by the operating through hole 150, and the guiding sub-rod 320 and the supporting sub-rod 310 are fixed by screws.

[0056] Optionally, the guide sub-rod 320 is a cylindrical rod, and the guide sub-rod 320 is slidably matched with the guide inclined groove 120 and the buffer groove 130, with a small contact area, small resistance, and more flexible sliding.

[0057] In this embodiment, optionally, the undercut demoulding mechanism further includes a first driving member (not shown), a first ejector plate 400, a second driving member (not shown) and a second ejector plate 500, the ejector rod 200 is connected to the first ejector plate 400, the first driving member is connected to the first ejector plate 400 and is used to drive the first ejector plate 400 to move in the mold opening and closing direction; the supporting rod 310 is connected to the second ejector plate 500, the second driving member is connected to the second ejector plate 500 and is used to drive the second ejector plate 500 to move in the mold opening and closing direction. At the same time, the first ejector plate 400 and the second ejector plate 500 are attached, the second ejector plate 500 carries the first ejector plate 400, and the second ejector plate 500 can drive the first ejector plate 400 to move synchronously when it rises.

[0058] It should be understood that the first drive member and the second drive member can both be configured as a cylinder, a hydraulic cylinder, an electric push rod or a screw transmission structure. In addition, the structures of the first drive member and the second drive member can be configured to be different.

[0059] In this embodiment, optionally, at least one of the top rod 200 and the supporting sub-rod 310 is provided with a sliding sleeve 600 on its outer cover, for example, the top rod 200 or the supporting sub-rod 310 is provided with a sliding sleeve 600 on its outer cover, or both the top rod 200 and the supporting sub-rod 310 are provided with a sliding sleeve 600 on their outer covers.

[0060] Please combine Figure 1-Figure 3The undercut demoulding mechanism provided in this embodiment sets the mold closing state, and the guide rod 320 and the buffer groove 130 are against the groove wall away from the guide inclined groove 120. After the injection molding is completed and the mold is opened, the second driving member starts to drive the second ejector plate 500 to rise in the mold opening direction. At the same time, the first ejector plate 400 is raised together with the second ejector plate 500, and the inclined ejector block 100, the ejector rod 200 and the guide rod 300 are all raised together, so that the product is separated from the mold cavity of the mold core. Then, the second ejector plate 500 stops moving, and the guide rod 320 is connected to the second ejector plate 500 through the supporting rod 310, and the guide rod 320 stops moving. Start the first driving member, and the first driving member drives the first ejector plate 400 to continue to move in the mold opening direction, thereby driving the inclined ejector block 100 to move in the mold opening direction under the action of the ejector rod 200, that is, driving the inclined ejector block 100 to rise. Since the guide rod 320 is located in the buffer groove 130, at this time, the inclined ejector block 100 first performs a linear upward movement relative to the guide rod 320, and the linear upward distance is the same as the length of the buffer groove 130. When the inclined ejector block 100 rises to the guide inclined groove 120 and corresponds to the guide rod 320, the first groove wall 121 on the guide inclined groove 120 abuts against the guide rod 320 and guides the inclined ejector block 100 to move in the extension direction of the guide inclined groove 120, that is, the inclined ejector block 100 simultaneously performs upward and horizontal movement. When the inclined ejector block 100 moves horizontally, the inclined ejector block 100 and the ejector rod 200 slide in cooperation through the dovetail structure or the "T"-shaped structure, and the inclined ejector block 100 slides relative to the ejector rod 200 without falling out of the ejector rod 200. When the ejector rod 200 drives the inclined ejector block 100 to rise to the end of the guide inclined groove 120 away from the buffer groove 130 and abuts against the guide branch rod 320, the inclined motion stroke of the inclined ejector block 100 ends, and the undercut demoulding is completed. At this time, the injection molded product can be removed.

[0061] At the same time, when a new product needs to be injected, during the mold closing action, the first ejector plate 400 moves downward, driving the inclined ejector block 100 to move downward, and the second groove wall 122 of the guide chute 120 abuts against the guide rod 320. Under the action of the guide rod 320, the inclined ejector block 100 moves horizontally while descending. At this time, the lateral movement of the inclined ejector block 100 is opposite to the lateral movement of the inclined ejector block 100 during the mold opening process. At the same time, the second ejector plate 500 moves downward, driving the guide rod 320 to move downward together, and finally, the buffer groove 130 on the inclined ejector block 100 is away from the groove wall of the guide chute 120 and abuts against the guide rod 320. At the same time, due to the design of the buffer groove 130, during the process of opening or closing the mold, the inclined lift block 100 always has one end that moves linearly up or down in the direction of opening or closing the mold, which can play a buffering role. At the same time, it can also make up for the mismatch in the positions of the inclined lift block 100 and the guide rod 320 caused by insufficient control accuracy of the first drive member and the second drive member, thereby avoiding the situation where the inclined lift block 100 does not move into place or gets stuck, thereby improving the safety of the mold operation.

[0062] In the present embodiment, it should be noted that the number of the push rods 200 can be one or more. When there are multiple push rods 200, the first side 101 of the inclined push block 100 is correspondingly provided with multiple first connecting parts 110, so that each push rod 200 is slidably matched with a first connecting part 110.

[0063] The inverted demoulding mechanism provided in this embodiment installs the first ejector plate 400 and the second ejector plate 500 on the rear mold, and the ejector rod 200 and the supporting sub-rod 310 are both arranged vertically, that is, the ejector rod 200 and the supporting sub-rod 310 are both arranged along the mold opening and closing direction. In this way, the ejector rod 200 and the supporting sub-rod 310 occupy a small space, which can reduce the mold volume and reduce the mold cost.

[0064] In this embodiment, it should be noted that the mold opening direction is the direction indicated by the ab arrow in the figure, and the mold closing direction is the direction indicated by the ba arrow in the figure; the release direction is the direction indicated by the cd arrow in the figure, and the reset direction is the direction indicated by the dc arrow in the figure.

[0065] This embodiment also provides an injection mold, including the undercut demoulding mechanism mentioned in the above embodiment.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An undercut demoulding mechanism, It is characterized in that include: An inclined ejector block, an ejector rod and a guide rod, wherein the inclined ejector block is provided with a first connection portion and a guide inclined groove, the ejector rod is provided with a second connection portion, the second connection portion is slidably matched with the first connection portion, and the guide rod is slidably matched with the guide inclined groove; The ejector rod is used to drive the inclined ejector block to move relative to the guide rod when moving along the mold opening and closing direction, so that the guide inclined groove abuts against the guide rod, thereby causing the inclined ejector block to slide relative to the ejector rod along a release direction having an included angle with the mold opening and closing direction; The guide rod comprises a connected supporting sub-rod and a guiding sub-rod, the top rod and the supporting sub-rod extend in the same direction, the guiding sub-rod and the supporting sub-rod have an included angle, and the guiding sub-rod is slidably matched with the guiding inclined groove; The inclined top block is provided with a slide groove, the guide inclined groove includes two groove sections located on both sides of the slide groove, the support branch rod is slidably matched with the slide groove, and the guide branch rod is slidably matched with the two groove sections at the same time; The undercut demolding mechanism also includes a first driving member, a first ejector plate, a second driving member and a second ejector plate, the ejector rod is connected to the first ejector plate, the first driving member is connected to the first ejector plate and is used to drive the first ejector plate to move along the mold opening and closing direction; the supporting branch rod is connected to the second ejector plate, the second driving member is connected to the second ejector plate and is used to drive the second ejector plate to move along the mold opening and closing direction.

2. The undercut demoulding mechanism according to claim 1, Features: The first driving member is connected to the first ejector plate, the first ejector plate cooperates with the second ejector plate, and the second ejector plate is used to drive the first ejector plate to move.

3. The undercut demoulding mechanism according to claim 1, Features: At least one of the top rod and the supporting branch rod is provided with a sliding sleeve.

4. The undercut demoulding mechanism according to claim 1, Features: The inclined ejector block is provided with a buffer groove communicated with the guide inclined groove, and the guide rod and the buffer groove are slidably matched in the mold opening and closing direction.

5. The undercut demoulding mechanism according to claim 1, Features: The guide inclined groove has a first groove wall and a second groove wall arranged opposite to each other, wherein the first groove wall is used to abut against the guide rod when the ejector rod drives the inclined ejector block to move along the mold opening direction, so as to drive the inclined ejector block to move along the release direction relative to the ejector rod; The second groove wall is used to abut against the guide rod when the ejector rod drives the inclined ejector block to move in the mold closing direction, so as to drive the inclined ejector block to move in a reset direction opposite to the release direction relative to the ejector rod; the mold opening direction is opposite to the mold closing direction.

6. The undercut demoulding mechanism according to claim 1, Features: The first connecting portion and the second connecting portion are mutually matched dovetail groove structures or "T"-shaped groove structures.

7. An injection mold, It is characterized in that The injection mold comprises: A fixed mold, a movable mold and an undercut demoulding mechanism as described in any one of claims 1 to 6, wherein the fixed mold and the movable mold are slidably matched along the mold opening and closing direction, and the ejector rod is arranged on the fixed mold and extends along the mold opening and closing direction.

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