A mold ejection limiting structure

Abstract

The present invention provides a mold ejection limiting structure, which belongs to the field of mold technology. It solves the problem of damage to a movable module or product caused by erroneous ejection in existing molds. In the mold ejection limiting structure, the mold includes a fixed module, a movable module arranged to slide horizontally, and an ejection plate located below the fixed module and capable of vertical sliding. The movable module and the fixed module are molded together to form a molding cavity. An ejector rod is fixedly connected to the ejector plate to eject the product in the molding cavity when the ejector plate slides vertically. The ejection limiting structure includes a base fixed on the movable module and a movable guide rod that slides vertically through the fixed module. A connecting rod that can drive the movable guide rod to move vertically is provided between the base and the movable guide rod. When the movable module and the fixed module are in the mold-closing state, the lower end of the movable guide rod is vertically pressed against the ejection plate. When the fixed module and the movable module are opened, the base drives the connecting rod to swing so that the movable guide rod moves up to separate from the ejection plate. The mold ejection limiting structure avoids damage to the product caused by erroneous ejection.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to a mold ejection limiting structure. Background Art

[0002] Existing injection molds usually form a cavity by combining a moving module and a fixed module, and inject unformed plastic into the cavity from an injection port. After injection molding, the molded part is usually ejected by an ejector pin in the mold to complete demolding. Existing mold demolding directions include horizontal demolding and vertical demolding, both of which are more common.

[0003] For example, Chinese patent application [Authorization Announcement No.: CN210969787U] discloses a super hemispherical resin optical protective cover injection molding demolding, including a mold frame bottom plate, and the mold frame bottom plate is sequentially provided with a first ejector fixing plate, a first ejector plate, a second ejector fixing plate and a second ejector plate from bottom to top, and a limit rod for limiting the ejection stroke is provided at the right end of the mold frame bottom plate, and the upper end of the limit rod passes through the first ejector fixing plate, the first ejector plate, the second ejector fixing plate and the second ejector plate in sequence and is fixed on the lower surface of the rear mold pad, and the second ejector fixing plate is provided with an ejector for ejecting the product.

[0004] Although the above structure limits the ejection stroke by the limit rod and the ejector ejects the product, the setting of the limit rod is to limit the stroke of the first ejector fixing plate and the first ejector plate, and also to guide the second ejector fixing plate and the second ejector plate, so that the entire demolding process is smoother. In the mold opening process, since the ejector is directly arranged around the cavity, it is convenient to directly eject the product after the product is formed. However, in the demolding process, since the ejector moves forward with the second ejector fixing plate and the second ejector plate to eject the product in the cavity, in this process, it cannot be guaranteed that the ejector ejects the product after the mold is fully opened. If the mold is in the mold opening process, the ejector may be ejected by mistake. The direct ejection of the ejector will cause damage to the components and products in the mold, thereby affecting the product qualification rate and the service life of the mold. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and propose a mold ejection limiting structure. The technical problem to be solved by the present invention is: how to solve the problem of damage to the moving module or product caused by incorrect ejection.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A mold ejection limiting structure, the mold includes a fixed module, a movable module arranged to slide along the horizontal direction, and an ejection plate located below the fixed module and capable of vertically sliding, the movable module and the fixed module are molded together to form a molding cavity, and an ejector rod is fixedly connected to the ejector plate to eject the product in the molding cavity when the ejector plate slides vertically, and is characterized in that the ejection limiting structure includes a base fixed on the movable module and a movable guide rod that slides vertically through the fixed module, a connecting rod that can drive the movable guide rod to move vertically is provided between the base and the movable guide rod, when the movable module and the fixed module are in the mold-closing state, the lower end of the movable guide rod is vertically pressed against the ejection plate, and when the fixed module and the movable module are opened, the base drives the connecting rod to swing so that the movable guide rod moves up to be separated from the ejection plate.

[0008] Working principle: After the movable module and the fixed module are molded together, the unformed plastic is injected into the molding cavity. At this time, the movable module and the fixed module are molded together, and the lower end of the movable guide rod on the base is always vertically against the ejector plate to limit the ejector plate to prevent the ejector plate from moving upward. When demolding, the movable module is opened horizontally, and the movable module drives the base connected to the movable module to move horizontally. The movement of the base will drive the swing of the connecting rod hinged to the base, and drive the movable guide rod connected to the connecting rod to move upward. At this time, the movable guide rod is separated from the ejector plate, and the ejector plate can move upward to drive the ejector pin to The upward movement ejects the product in the molding cavity to avoid the ejector plate driving the ejector pin to move upward when the movable module and the fixed module are not opened. Since the movable module needs to move horizontally when demolding, and the ejector plate needs to move vertically, a connecting rod is provided on the ejection limit mechanism, and the movable guide rod is driven upward by the connecting rod to release the limit on the ejector plate. In this scheme, the movable module must drive the base to move the movable guide rod upward, and the ejector plate can move upward at this time, thereby avoiding damage to the movable module or the product caused by the wrong ejection of the ejector pin, thereby improving the product qualification rate and the service life of the mold.

[0009] In the above-mentioned mold ejection limiting structure, one end of the connecting rod is hinged to the base, and the other end of the connecting rod is hinged to the moving guide rod. When the moving module and the fixed module are in the mold closing state, the connecting rod and the moving guide rod are coaxially arranged. When the moving module is opened horizontally, the connecting rod moves with the base to be inclined toward the mold opening direction and drives the moving guide rod to slide vertically.

[0010] When the mold is in the mold closing state, the connecting rod and the moving guide rod are coaxially arranged. At this time, the connecting rod and the moving guide rod are both vertically arranged, so that the moving guide rod can limit the ejector plate more stably. The vertical arrangement of the connecting rod can be more stably against the base without displacement. When the moving module is opened horizontally, the connecting rod is tilted with the base. The moving guide rod can only slide vertically due to the limitation of the fixed module, so that the moving guide rod is separated from the ejector plate, thereby improving the stability of the ejection limiting structure.

[0011] In the above-mentioned mold ejection limiting structure, the fixed module is provided with a clearance slot for the base to be placed, the base can slide laterally along the clearance slot and the bottom surface of the base is always in contact with the lower slot wall of the clearance slot.

[0012] By providing a yielding slot, the sliding of the base can be guided, and at the same time, the lower slot wall of the yielding slot supports the bottom surface of the base. At this time, most of the weight of the base can be transferred to the fixed module, so that when most of the base slides out of the yielding slot, the lower slot wall of the yielding slot always supports the base, further ensuring that the base has little impact on the moving module during the sliding process, and also facilitating the moving module to drive the base to slide, so that after the moving module slides, the moving guide rod connected to the base can move up quickly without affecting the demolding of the mold.

[0013] In the above-mentioned mold ejection limiting structure, one end of the base is provided with a mounting groove which vertically penetrates the base, one end of the connecting rod is embedded in the mounting groove and hinged with the base, and the mounting groove has an inwardly recessed concession opening. When the fixed module and the movable module are opened, the connecting rod swings until part of it is located in the concession opening.

[0014] The setting of the mounting groove makes the rotation of the connecting rod smoother, and the setting of the make way opening enables the base to make way for the connecting rod to the maximum extent while ensuring the structural strength, avoiding interference with the connecting rod when the connecting rod rotates, so that the moving guide rod can move up quickly when the mold is opened without affecting the mold opening efficiency.

[0015] In the above-mentioned mold ejection limiting structure, the base is provided with a fixing hole 1 and a fixing hole 2 both located on one side of the connecting rod. The ejection limiting structure also includes a positioning pin and a fastener. The fixing hole 1 is located at the end away from the connecting rod. The fastener is penetrated from top to bottom in the fixing hole 1 and fixes the movable module to the base. The positioning pin passes through the fixing hole 2 from bottom to top and is penetrated in the movable module to position the movable module and the base.

[0016] The fastener is inserted into the fixing hole from top to bottom, while the positioning pin is inserted into the moving module from bottom to top. Through the connection in different directions up and down, it is avoided that when the base shakes, the fastener can provide an upward pulling force, while the positioning pin can provide an upward supporting force, thereby ensuring a more stable connection between the base and the moving module, avoiding the fastener from easily loosening during long-term use, and further improving the stability of the ejection limit structure.

[0017] In the above-mentioned mold ejection limiting structure, a placement groove connected to the giving way slide groove is opened on the fixed module, one end of the movable guide rod is located in the placement groove, and there is a gap between the outer wall of the movable guide rod and the side wall of the placement groove.

[0018] There is a gap between the outer wall of the moving guide rod and the side wall of the placement groove, so that the friction between the moving guide rod and the fixed module is reduced when the moving guide rod slides up and down, avoiding the jamming of the moving guide rod, facilitating the rotation of the connecting rod, and reducing the demoulding force required to push the moving module, making the demoulding of the mold more convenient and quick.

[0019] In the above-mentioned mold ejection limiting structure, the fixed module is provided with a through hole for the movable guide rod to pass through at the bottom of the placement groove, the outer wall of the movable guide rod is in contact with the hole wall of the through hole, and one end of the movable guide rod has a radially outwardly protruding limiting ring, and the outer diameter of the limiting ring is larger than the diameter of the through hole.

[0020] The setting of the through hole prevents the movable guide rod from tilting when the connecting rod drives the movable guide rod to move upward, and the setting of the limit ring can limit the movable guide rod. When the movable module and the fixed module are molded together, the upper end of the movable guide rod can be stably set in the placement groove, thereby improving the stability of the ejection limit structure.

[0021] In the above-mentioned mold ejection limiting structure, a notch communicating with the through hole is opened at the lower end of the fixed module, the movable guide rod is partially located in the notch, and there is a gap between the movable guide rod and the notch.

[0022] The setting of the gap and the above-mentioned space ensures that the upper and lower ends of the moving guide rod are not in contact with the fixed module, and the middle part of the moving guide rod is limited by the through hole, thereby ensuring the sliding stability of the moving guide rod while reducing the friction between the moving guide rod and the fixed module, reducing the greater force required when opening the moving module, and making the opening of the mold more labor-saving.

[0023] In the above-mentioned mold ejection limiting structure, the movable guide rod includes a connecting portion hinged to the connecting rod and an extended portion capable of abutting against the ejection plate, and one end of the connecting portion is fixedly connected to one end of the extended portion.

[0024] The arrangement of the connecting portion and the extension portion enables the ejection limiting structure to be adapted to different molds by replacing extension portions of different lengths so that, in the mold closing state, the bottom of the extension portion can abut against the ejection plate, thereby enhancing the applicability of the ejection limiting structure.

[0025] In the above-mentioned mold ejection limiting structure, one end of the extension part is raised to form a threaded column, one end of the connecting part is provided with a threaded hole, and the threaded column can be embedded in the threaded hole to fix the connecting part and the extension part.

[0026] The arrangement of this structure makes the connection between the extension part and the connection part more convenient, and the threaded connection is more stable, and no misalignment will occur after the connection.

[0027] Compared with the prior art, the mold ejection limiting structure has the following advantages:

[0028] 1. When the movable module and the fixed module are molded together, the lower end of the movable guide rod on the base is always vertically against the ejector plate to prevent the ejector plate from moving upward. When demolding, the movable module drives the base connected to the movable module to move horizontally. The movement of the base will drive the connecting rod hinged to the base to swing, and drive the movable guide rod connected to the connecting rod to move upward. At this time, the movable guide rod is separated from the ejector plate, and the ejector plate can move upward to drive the ejector pin to move upward to eject the product in the molding cavity, avoiding the ejector plate driving the ejector pin to move upward when the movable module and the fixed module are not molded.

[0029] 2. The setting of the give-way slide groove enables the base to slide only with the moving module without falling, etc., and the support of the lower groove wall of the give-way slide groove on the lower side of the base enables the base to slide with the moving module. When most of the base slides out of the give-way slide groove, the lower groove wall of the give-way slide groove always supports the base, further ensuring that the base has little influence on the moving module during the sliding process.

[0030] 3. The fastener is inserted into the fixing hole 1 from top to bottom, while the positioning pin is inserted into the moving module from bottom to top. Through the connection in different directions up and down, it is avoided that when the base shakes, the fastener can provide an upward pulling force, while the positioning pin can provide an upward supporting force, thereby ensuring a more stable connection between the base and the moving module, avoiding the fastener from being easily loosened during long-term use, and further improving the stability of the ejection limit structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the ejection limiting structure of the mold when the mold is closed.

[0032] Figure 2 It is a structural schematic diagram of the ejection limiting structure of the mold when the mold is opened.

[0033] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0034] Figure 4 It is a structural schematic diagram of the ejection limiting structure of the mold.

[0035] Figure 5 It is a top view of the ejection limiting structure of the mold.

[0036] Figure 6 is along Figure 5 Sectional view of AA.

[0037] In the figure, 1, moving module; 2, fixed module; 21, give-way slide groove; 22, placement groove; 22a, gap; 23, through hole; 24, notch; 24a, gap; 3, ejector plate; 4, molding cavity; 5, ejector rod; 6, base; 61, installation groove; 62, give-way opening; 63 fixing hole one; 64, fixing hole two; 7, connecting rod; 8, moving guide rod; 81, limiting ring; 82, connecting part; 82a, threaded hole; 83, extension part; 83a, threaded column; 9, positioning pin; 10, fastener. DETAILED DESCRIPTION

[0038] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0039] like Figure 1 As shown, the mold ejection limiting structure comprises a fixed module 2, a movable module 1 arranged to slide along the horizontal direction, and an ejector plate 3 located below the fixed module 2 and capable of sliding along the vertical direction. The movable module 1 and the fixed module 2 are combined to form a molding cavity 4. The ejector plate 3 is fixedly connected with an ejector rod 5 for ejecting the product in the molding cavity 4 when the ejector plate 3 slides vertically.

[0040] Specifically, Figure 1-6 As shown, the ejection limiting structure includes a base 6 fixed on the movable module 1 and a movable guide rod 8 which slides vertically through the fixed module 2. A connecting rod 7 which can drive the movable guide rod 8 to move vertically is provided between the base 6 and the movable guide rod 8. When the movable module 1 and the fixed module 2 are in the mold closing state, the lower end of the movable guide rod 8 is vertically pressed against the ejection plate 3. When the fixed module 2 and the movable module 1 are in the mold opening state, the base 6 drives the connecting rod 7 to swing so that the movable guide rod 8 moves up to be separated from the ejection plate 3.

[0041] Working principle: In this scheme, the movable module is opened horizontally. After the movable module 1 and the fixed module 2 are molded together, the unformed plastic is injected into the molding cavity 4. At this time, the movable module 1 and the fixed module 2 are molded together, and the lower end of the movable guide rod 8 on the base 6 is always vertically against the ejector plate 3 to prevent the ejector plate 3 from moving upward. When demolding, the movable module 1 is opened horizontally, and the movable module 1 drives the base 6 fixed to the movable module 1 to move horizontally. The movement of the base 6 will drive the swing of the connecting rod 7 hinged to the base 6, and drive the movable guide rod 8 connected to the connecting rod 7 to move upward. At this time, the movable guide rod 8 is separated from the ejector plate 3, and the ejector plate 3 can move upward to drive the ejector pin to move upward. The product in the molding cavity 4 is ejected to prevent the ejector plate 3 from driving the ejector pin to move upward when the movable module 1 and the fixed module 2 are not molded. Since the moving directions of the movable module 1 and the ejector plate 3 are inconsistent, the movable module 1 needs to move horizontally when demolding, while the ejector plate 3 needs to move vertically. Therefore, a connecting rod 7 is provided on the ejection limit mechanism, and the movable guide rod 8 is driven upward by the connecting rod 7 to release the limit on the ejector plate 3. In this scheme, the movable module 1 must drive the base 6 to move the movable guide rod 8 upward, and the ejector plate 3 can move upward at this time, thereby avoiding damage to the movable module 1 or the product caused by the wrong ejection of the ejector pin, thereby improving the product qualification rate and the service life of the mold.

[0042] like Figure 1-3 As shown, one end of the connecting rod 7 is hinged to the base 6, and the other end of the connecting rod 7 is hinged to the moving guide rod 8. When the moving module 1 and the fixed module 2 are in the mold closing state, the connecting rod 7 and the moving guide rod 8 are coaxially arranged. When the moving module 1 is horizontally opened, the connecting rod 7 moves with the base 6 to be inclined in the mold opening direction and drives the moving guide rod 8 to slide vertically. A clearance groove 21 for the base 6 to be placed is provided on the fixed module 2. The base 6 can slide horizontally along the clearance groove 21 and the bottom surface of the base 6 is always in contact with the lower groove wall of the clearance groove 21.

[0043] like Figure 3-6 As shown, one end of the base 6 is provided with a mounting groove 61 which vertically penetrates the base 6, one end of the connecting rod 7 is embedded in the mounting groove 61 and is hinged to the base 6, and the mounting groove 61 has an inwardly recessed clearance opening 62. When the fixed module 2 and the movable module 1 are molded, the connecting rod 7 swings until part of it is located in the clearance opening 62, and the base 6 is provided with a fixing hole 1 63 and a fixing hole 2 64 which are both located on one side of the connecting rod 7. The ejection limiting structure also includes a positioning pin 9 and a fastener 10. The fixing hole 1 63 is located at the end away from the connecting rod 7, and the fastener 10 is penetrated from top to bottom in the fixing hole 1 63 to fix the movable module 1 to the base 6, and the positioning pin 9 passes through the fixing hole 2 64 from bottom to top and is penetrated in the movable module 1 to position the movable module 1 and the base 6.

[0044] The setting of the mounting groove 61 allows the connecting rod 7 to rotate more smoothly, and the setting of the yielding opening 62 allows the base 6 to yield to the connecting rod 7 to the maximum extent while ensuring the structural strength. The fastener 10 is penetrated from top to bottom in the fixing hole 63, and the positioning pin 9 is penetrated from bottom to top in the movable module 1. Through the connection in different directions up and down, when the base 6 shakes, the fastener 10 can avoid providing an upward pulling force, and the positioning pin 9 can provide an upward supporting force, thereby ensuring that the connection between the base 6 and the movable module 1 is more stable, avoiding the fastener 10 from being easily loosened during long-term use, and further improving the stability of the ejection limit structure.

[0045] like Figure 1-3 As shown, a placement groove 22 connected to the give-way groove 21 is provided on the fixed module 2, one end of the moving guide rod 8 is located in the placement groove 22, and a gap 22a is provided between the outer wall of the moving guide rod 8 and the side wall of the placement groove 22, and a through hole 23 for the moving guide rod 8 to pass through is provided at the bottom of the placement groove 22 of the fixed module 2, the outer wall of the moving guide rod 8 is fitted with the hole wall of the through hole 23, one end of the moving guide rod 8 has a radially outwardly protruding limit ring 81, the outer diameter of the limit ring 81 is larger than the diameter of the through hole 23, and a notch 24 connected to the through hole 23 is provided at the lower end of the fixed module 2, the moving guide rod 8 is partially located in the notch 24, and a gap 24a is provided between the moving guide rod 8 and the notch 24.

[0046] The setting of the gap 24a and the space 22a ensures that the upper and lower ends of the moving guide rod 8 are not in contact with the fixed module 2, and the middle part of the moving guide rod 8 is limited by the through hole 23, thereby ensuring the sliding stability of the moving guide rod 8 while reducing the friction between the moving guide rod 8 and the fixed module 2, reducing the greater force required when opening the moving module 1, and making the opening of the mold more labor-saving.

[0047] like Figure 6 As shown, the movable guide rod 8 includes a connecting portion 82 hinged to the connecting rod 7 and an extension portion 83 that can abut against the ejection plate 3, one end of the connecting portion 82 is fixedly connected to one end of the extension portion 83, one end of the extension portion 83 is protruded to form a threaded column 83a, one end of the connecting portion 82 is provided with a threaded hole 82a, and the threaded column 83a can be embedded in the threaded hole 82a to fix the connecting portion 82 and the extension portion 83.

[0048] The arrangement of the connecting portion 82 and the extension portion 83 enables, when the ejection limiting structure needs to be applied to different molds, the extension portion 83 of different lengths can be replaced so that in the mold closing state, the bottom of the extension portion 83 can abut against the ejection plate 3, thereby enhancing the applicability of the ejection limiting structure.

[0049] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A mold ejection limiting structure, the mold comprising a fixed module (2), a movable module (1) arranged to slide in the transverse direction, and an ejection plate (3) located below the fixed module (2) and capable of sliding in the vertical direction, the movable module (1) and the fixed module (2) being molded together to form a molding cavity (4), the ejection plate (3) being fixedly connected with an ejector rod (5) for ejecting a product in the molding cavity (4) when the ejection plate (3) slides vertically, characterized in that: The ejection limiting structure comprises a base (6) fixed on a movable module (1) and a movable guide rod (8) which slides vertically through a fixed module (2); a connecting rod (7) which can drive the movable guide rod (8) to move vertically is arranged between the base (6) and the movable guide rod (8); when the movable module (1) and the fixed module (2) are in a mold-clamping state, the lower end of the movable guide rod (8) is vertically pressed against an ejection plate (3); when the fixed module (2) and the movable module (1) are in an open mold state, the base (6) drives the connecting rod (7) to swing so that the movable guide rod (8) moves upward to be separated from the ejection plate (3).

2. The mold ejection limiting structure according to claim 1, characterized in that: One end of the connecting rod (7) is hinged to the base (6), and the other end of the connecting rod (7) is hinged to the moving guide rod (8). When the moving module (1) and the fixed module (2) are in a mold-closing state, the connecting rod (7) and the moving guide rod (8) are coaxially arranged. When the moving module (1) is horizontally opened, the connecting rod (7) moves with the base (6) to be inclined toward the mold opening direction and drives the moving guide rod (8) to slide vertically.

3. The mold ejection limiting structure according to claim 1, characterized in that: The fixed module (2) is provided with a clearance groove (21) for the base (6) to be placed, and the base (6) can slide horizontally along the clearance groove (21) and the bottom surface of the base (6) is always in contact with the lower groove wall of the clearance groove (21).

4. The mold ejection limiting structure according to claim 1, 2 or 3, characterized in that: One end of the base (6) is provided with a mounting groove (61) which vertically penetrates the base (6); one end of the connecting rod (7) is embedded in the mounting groove (61) and is hinged to the base (6); the mounting groove (61) has an inwardly recessed clearance opening (62); when the fixed module (2) and the movable module (1) are opened, the connecting rod (7) swings until a portion of it is located in the clearance opening (62).

5. The mold ejection limiting structure according to claim 1, 2 or 3, characterized in that: The base (6) is provided with a fixing hole 1 (63) and a fixing hole 2 (64) both located on one side of the connecting rod (7). The ejection limiting structure further comprises a positioning pin (9) and a fastener (10). The fixing hole 1 (63) is located at an end away from the connecting rod (7). The fastener (10) is inserted into the fixing hole 1 (63) from top to bottom and securely connects the moving module (1) to the base (6). The positioning pin (9) is inserted into the fixing hole 2 (64) from bottom to top and inserted into the moving module (1) so that the moving module (1) and the base (6) are positioned.

6. The mold ejection limiting structure according to claim 3, characterized in that: The fixed module (2) is provided with a placement groove (22) which is in communication with the giving way slide groove (21); one end of the movable guide rod (8) is located in the placement groove (22); and a gap (22a) is provided between the outer wall of the movable guide rod (8) and the side wall of the placement groove (22).

7. The mold ejection limiting structure according to claim 6, characterized in that: The fixed module (2) is provided with a through hole (23) at the bottom of the placement groove (22) for the movable guide rod (8) to pass through, the outer wall of the movable guide rod (8) is in contact with the hole wall of the through hole (23), and one end of the movable guide rod (8) is provided with a radially outwardly protruding limiting ring (81), and the outer diameter of the limiting ring (81) is greater than the diameter of the through hole (23).

8. The mold ejection limiting structure according to claim 7, characterized in that: A notch (24) communicating with the through hole (23) is provided at the lower end of the fixed module (2); the movable guide rod (8) is partially located in the notch (24), and a gap (24a) is provided between the movable guide rod (8) and the notch (24).

9. The mold ejection limiting structure according to claim 1, 2 or 3, characterized in that: The movable guide rod (8) comprises a connecting portion (82) hinged to the connecting rod (7) and an extended portion (83) capable of abutting against the ejection plate (3), and one end of the connecting portion (82) is fixedly connected to one end of the extended portion (83).

10. The mold ejection limiting structure according to claim 9, characterized in that: One end of the extension part (83) is raised to form a threaded column (83a), and one end of the connecting part (82) is provided with a threaded hole (82a). The threaded column (83a) can be embedded in the threaded hole (82a) to securely connect the connecting part (82) and the extension part (83).

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