CN114012997A - Ejecting limit structure of mould - Google Patents

Abstract

The invention provides a mold ejection limiting structure, and belongs to the technical field of molds. The problem that the movable module or a product is damaged due to mistaken ejection of an existing mold is solved. This ejecting limit structure of mould, the mould includes the cover half piece, the movable mould that sets up along horizontal slip with be located the cover half piece below and can vertical gliding liftout plate, the compound die forms the shaping chamber between movable mould piece and the cover half piece, link firmly on the liftout plate with the ejecting intracavity product ejecting ejector pin when the vertical slip of liftout plate, this ejecting limit structure is including fixing the base on the movable mould piece and the movable guide arm that passes the cover half piece along vertical slip, be equipped with the connecting rod that can drive movable guide arm vertical movement between base and the movable guide arm, the movable mould piece moves the vertical pressure of movable guide arm lower extreme on the liftout plate under the compound die state with the cover half piece, the base drives the connecting rod swing when the cover half piece and the movable mould piece and makes the movable guide arm go up to separate with the liftout plate. The mold ejection limiting structure avoids damage to products caused by mistaken ejection.

Description

Ejecting limit structure of mould

Technical Field

The invention belongs to the technical field of molds and relates to a mold ejection limiting structure.

Background

The existing injection mold is generally characterized in that a movable mold block and a fixed mold block are assembled to form a mold cavity, unformed plastic is injected into the mold cavity from an injection molding opening, a formed part is usually ejected out through an ejector pin in the mold after injection molding, so that demolding is finished, and the existing mold has transverse demolding and vertical demolding in the demolding direction, which are common.

As in chinese patent application [ grant publication No.: CN210969787U discloses a super hemisphere resin optics safety cover injection moulding drawing of patterns, including the die carrier bottom plate, the die carrier bottom plate has set gradually first thimble fixed plate from supreme down, first thimble board, second thimble fixed plate and second thimble board, the right-hand member is equipped with the gag lever post that is used for restricting ejecting stroke on the die carrier bottom plate, the gag lever post upper end passes first thimble fixed plate in proper order, first thimble board, second thimble fixed plate and second thimble board are fixed at back die cushion board lower surface, be provided with the thimble that is used for ejecting product on the second thimble fixed plate.

Although the structure limits the ejection stroke through the limiting rod, the ejector pin ejects the product, the arrangement of the limiting rod limits the stroke of the first ejector pin fixing plate and the first ejector pin plate and guides the second ejector pin fixing plate and the second ejector pin plate, so that the whole demolding process is smoother, and in the mold opening process, because the ejector pin is directly arranged at the periphery of the cavity, the product can be directly ejected after being formed, but in the demoulding process, because the thimble moves forwards along with the second thimble fixing plate and the second thimble plate to eject the product in the cavity, in the process, the ejector pins cannot be guaranteed to eject the product after the mold is completely opened, if the mold is opened, the ejector pins can be ejected mistakenly, the ejector pins are directly ejected to damage parts and products in the mold, and therefore the qualification rate of the product and the service life of the mold are affected.

Disclosure of Invention

The invention aims to provide a die ejection limiting structure aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to solve the problem of moving module or product damage caused by false ejection.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides an ejecting limit structure of mould, the mould includes the cover half piece, along the movable mould that the lateral sliding set up and be located cover half piece below and can vertically gliding knock-out plate, the compound die forms into the die cavity between movable mould piece and the cover half piece, link firmly on the knock-out plate with the ejecting intracavity product ejecting ejector pin when the knock-out plate is vertical to slide, its characterized in that, this ejecting limit structure is including fixing the base on the movable mould piece and passing the movable guide arm of cover half piece along vertical slip, be equipped with the connecting rod that can drive movable guide arm vertical movement between base and the movable guide arm, move the vertical pressure of movable guide arm lower extreme under the compound die state on the knock-out plate when movable mould piece and cover half piece, the base drives the connecting rod swing guide arm and moves to and makes the movable guide arm go up to and separate with the knock-out plate when cover half piece and movable mould piece.

The working principle is as follows: the unformed plastic is injected into a forming cavity after the movable module and the fixed module are assembled, at the moment, the movable module and the fixed module are assembled, the lower end of a movable guide rod on the base vertically abuts against the ejector plate to limit the ejector plate, the ejector plate is prevented from moving upwards, the movable module is opened along the transverse direction during demolding, the movable module drives the base fixedly connected with the movable module to move transversely together, the movement of the base can drive the swinging of a connecting rod hinged with the base and drive the movable guide rod connected with the connecting rod to move upwards, at the moment, the movable guide rod is separated from the ejector plate, the ejector plate can move upwards to drive the ejector pin to move upwards to eject a product in the forming cavity, and the situation that when the movable module and the fixed module are not opened, the ejector plate drives the ejector pin to move upwards, the ejector pin needs to move transversely during demolding of the movable module and needs to move vertically, therefore, the connecting rod is arranged on the ejection limiting mechanism, the connecting rod drives the movable guide rod to move upwards, the limit of the ejector plate is removed, the movable guide rod is driven to move upwards by the movable module, the ejector plate can move upwards only when the movable module drives the base, damage to the movable module or a product caused by mistaken ejection of the ejector pin is avoided, and therefore the qualified rate of the product and the service life of the die are improved.

In the mold ejection limiting structure, one end of the connecting rod is hinged to the base, the other end of the connecting rod is hinged to the movable guide rod, the connecting rod and the movable guide rod are coaxially arranged in a mold closing state of the movable module and the fixed module, and the connecting rod moves to be inclined towards a mold opening direction along with the base and drives the movable guide rod to slide vertically when the movable module opens the mold transversely.

When the mould is in the compound die state, the connecting rod with move the coaxial setting of guide arm, the equal vertical setting of connecting rod and movable guide arm this moment, it is spacing with the liftout plate that make movable guide arm can be more stable, the vertical setting of connecting rod can be more stable support with the base and lean on, can not take place the displacement, and when the horizontal die sinking of movable mould piece, the connecting rod sets up along with the base slope, movable guide arm can only follow vertical slip because the spacing of fixed mould piece leads actuating guide arm, make movable guide arm and liftout plate separation, ejecting limit structure's stability has been promoted.

In the ejecting limit structure of the mold, the fixed module is provided with the yielding chute for placing the base, the base can transversely slide along the yielding chute, and the bottom surface of the base is always attached to the lower chute wall of the yielding chute.

Through seting up the spout of stepping down, can lead to the slip of base, the lower cell wall of the spout of stepping down simultaneously supports the base bottom surface, most weight of base this moment can shift to on the fixed module, make when the spout is stepped down to most roll-off of base, the lower cell wall of the spout of stepping down supports the base all the time, further assurance the base is less to the influence of moving the module at the slip in-process, it slides also to have made things convenient for the moving module to drive the base, make the moving module slide the back, can shift up fast with pedestal connection's movable guide arm, do not influence the drawing of patterns of mould.

In the ejecting limit structure of foretell mould, the vertical mounting groove that runs through the base is seted up to the one end of base, the one end embedding mounting groove of connecting rod is interior and articulated with the base, the mounting groove has inside sunken mouth of stepping down, and the connecting rod swings to the part and is located the mouth of stepping down when fixed module and movable module die sinking.

The setting of mounting groove for the rotation of connecting rod can be more smooth and easy, and the setting of the mouth of stepping down, can make the base when guaranteeing structural strength, furthest steps down the connecting rod, avoids causing the interference to the connecting rod when the connecting rod rotates, thereby makes to move the guide arm when the mould die sinking and can shift up fast, does not influence die sinking efficiency.

In the above-mentioned ejecting limit structure of mould, set up the fixed orifices one and the fixed orifices two that all are located connecting rod one side on the base, this ejecting limit structure still includes locating pin and fastener, fixed orifices one is located the one end of keeping away from the connecting rod, the fastener is from last to wearing to establish in fixed orifices one down and making movable mould piece and base link firmly, the locating pin is from supreme passing fixed orifices two and wearing to establish and making movable mould piece and base location in the movable mould down.

The fastener is from last to wearing to establish in fixed orifices one down, and the locating pin is from supreme wearing to establish in the movable mould down, through the connection of upper and lower not equidirectional, has avoided taking place when rocking when the base, and the fastener can provide ascending pulling force, and the locating pin can provide ascending support power, has guaranteed to be connected more stable between base and the movable mould piece, has avoided causing the fastener to become flexible easily in long-term use, further promotion ejecting limit structure's stability.

In the above-mentioned mold ejection limiting structure, the fixed module is provided with a placing groove communicated with the yielding chute, one end of the movable guide rod is positioned in the placing groove, and a gap is formed between the outer wall of the movable guide rod and the side wall of the placing groove.

Have the space between the outer wall with the movable guide pole and the lateral wall of standing groove for the movable guide pole is at the upper and lower slip in-process, reduces the frictional force between movable guide pole and the cover half piece, has avoided the movable guide pole jamming to appear, makes things convenient for the connecting rod to rotate, has also reduced the required drawing of patterns power of promotion movable mould, makes the drawing of patterns convenient and fast more of mould.

In the above-mentioned mold ejection limiting structure, the fixed module is provided with a through hole at the bottom of the placing groove, through which the movable guide rod can pass, the outer wall of the movable guide rod is attached to the wall of the through hole, one end of the movable guide rod is provided with a limiting ring protruding outwards along the radial direction, and the outer diameter of the limiting ring is larger than the diameter of the through hole.

The setting of through-hole has avoided the connecting rod to drive when moving the guide arm and shift up, and the moving guide arm takes place the slope, and the setting of spacing ring can carry on spacingly to moving the guide arm, and when moving module and cover half piece compound die, the setting that the upper end of moving the guide arm can be stable has promoted ejecting limit structure's stability in the standing groove.

In the above-mentioned mold ejection limiting structure, the lower end of the fixed module is provided with a notch communicated with the through hole, the movable guide rod part is located in the notch, and a gap is formed between the movable guide rod and the notch.

The setting in clearance and above-mentioned space for the upper and lower both ends of movable guide arm all do not contact with the cover half piece, and the middle part of movable guide arm carries on spacingly through the through-hole, thereby can also reduce the friction between movable guide arm and the cover half piece when guaranteeing the gliding stability of movable guide arm, need great power when having reduced the movable mould piece die sinking, make the more laborsaving of die sinking of mould.

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

Connecting portion and extension portion's setting for when ejecting limit structure need be suitable for in the mould of difference, can make in the compound die state, the bottom of extension portion can lean on with the liftout plate counterbalance can through the extension portion of changing different length, thereby strengthened ejecting limit structure's suitability.

In the above mold ejection limiting structure, the protrusion at one end of the elongated portion forms a threaded column, a threaded hole is formed at one end of the connecting portion, and the threaded column can be embedded into the threaded hole to fixedly connect the connecting portion and the elongated portion.

The arrangement of the structure enables the connection of the lengthening part and the connecting part to be more convenient, the threaded connection is more stable, and the phenomenon of dislocation after connection cannot occur.

Compared with the prior art, the ejecting limit structure of this mould has the advantage:

1. at movable mould piece and cover half module compound die, the movable guide rod lower extreme on the base is vertical always to lean on with the liftout plate counterbalance, avoid the liftout plate to make progress the drunkenness, when the drawing of patterns, movable mould piece drives the base that links firmly with movable mould piece lateral shifting together, the removal of base can drive the swing of the connecting rod articulated with the base, and drive the movable guide rod rebound of being connected with the connecting rod, movable guide rod and liftout plate separation this moment, the liftout plate can the upward movement drive thimble upward movement and ejecting the product in the shaping intracavity, avoid when movable mould piece and cover half module do not die sinking, the liftout plate just drives the thimble and shifts up.

2. The setting of the spout of stepping down for can only slide along with the movable mould piece when the base slides, and can not appear dropping etc. and the lower cell wall of the spout of stepping down supports the downside of the base, makes the base when the movable mould piece slides, when the spout is stepped down to most roll-off of base, the lower cell wall of the spout of stepping down supports the base all the time, and further assurance the base is less to the influence of movable mould piece at the slip in-process.

3. The fastener is from last to wearing to establish in fixed orifices one down, and the locating pin is from supreme wearing to establish in the movable mould down, through the connection of upper and lower not equidirectional, has avoided taking place when rocking when the base, and the fastener can provide ascending pulling force, and the locating pin can provide ascending support power, has guaranteed to be connected more stable between base and the movable mould piece, has avoided causing the fastener to become flexible easily in long-term use, further promotion ejecting limit structure's stability.

Drawings

Fig. 1 is a schematic structural diagram of the mold ejection limiting structure during mold closing.

Fig. 2 is a schematic structural view of the mold ejection limiting structure during mold opening.

Fig. 3 is a partially enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic structural diagram of the ejection limiting structure of the mold.

Fig. 5 is a top view of the ejection limiting structure of the mold.

Fig. 6 is a sectional view taken along a-a in fig. 5.

In the figure, 1, a movable module; 2. determining a module; 21. a yielding chute; 22. a placement groove; 22a, a void; 23. a through hole; 24. a notch; 24a, a gap; 3. ejecting the plate; 4. a molding cavity; 5. a top rod; 6. a base; 61. mounting grooves; 62. a let position port; 63 a first fixing hole; 64. a second fixing hole; 7. a connecting rod; 8. a movable guide rod; 81. a limiting ring; 82. a connecting portion; 82a, a threaded hole; 83. a lengthening part; 83a, a threaded post; 9. positioning pins; 10. a fastener.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in figure 1, the mold ejection limiting structure comprises a fixed module 2, a movable module 1 arranged along the transverse sliding direction and an ejector plate 3 which is arranged below the fixed module 2 and can slide along the vertical direction, wherein a molding cavity 4 is formed between the movable module 1 and the fixed module 2 in a matched mode, and an ejector rod 5 which is used for ejecting a product in the molding cavity 4 when the ejector plate 3 slides vertically is fixedly connected onto the ejector plate 3.

Specifically, as shown in fig. 1-6, the ejection limiting structure includes a base 6 fixed on the movable module 1 and a movable guide rod 8 vertically sliding through the fixed module 2, a connecting rod 7 capable of driving the movable guide rod 8 to vertically move is disposed between the base 6 and the movable guide rod 8, when the movable module 1 and the fixed module 2 are in a mold closing state, the lower end of the movable guide rod 8 vertically presses against the ejector plate 3, and when the fixed module 2 and the movable module 1 are opened, the base 6 drives the connecting rod 7 to swing so as to move the movable guide rod 8 upward to be separated from the ejector plate 3.

The working principle is as follows: in the scheme, the movable module is transversely opened, unformed plastic is injected into a forming cavity 4 after the movable module 1 and the fixed module 2 are closed, the lower end of a movable guide rod 8 on a base 6 vertically abuts against an ejector plate 3 all the time, the ejector plate 3 is prevented from moving upwards, the movable module 1 is opened along the transverse direction during demolding, the movable module 1 drives the base 6 fixedly connected with the movable module 1 to move transversely together, the movement of the base 6 can drive a connecting rod 7 hinged with the base 6 to swing and drive the movable guide rod 8 connected with the connecting rod 7 to move upwards, the movable guide rod 8 is separated from the ejector plate 3 at the moment, the ejector plate 3 can move upwards to drive an ejector pin to move upwards to eject a product in the forming cavity 4, and the ejector plate 3 is prevented from driving the ejector pin to move upwards when the movable module 1 and the fixed module 2 are not opened, and the moving direction of the movable module 1 and the ejector plate 3 is inconsistent, need lateral shifting when moving module 1 drawing of patterns, and liftout plate 3 needs vertical removal, consequently be provided with connecting rod 7 on ejecting stop gear, drive through connecting rod 7 and move 8 rebound of guide arm, remove spacing to liftout plate 3, this scheme must drive base 6 at moving module 1 and will move 8 upstairs of guide arm, liftout plate 3 just can shift up this moment, avoided because the misextrusion of thimble is to the damage that moving module 1 or product caused, thereby the qualification rate of product and the life of mould have been promoted.

As shown in fig. 1-3, one end of a connecting rod 7 is hinged to a base 6, the other end of the connecting rod 7 is hinged to a movable guide rod 8, the connecting rod 7 and the movable guide rod 8 are coaxially arranged in a mold closing state of the movable module 1 and the fixed module 2, and the connecting rod 7 is obliquely arranged along with the base 6 in a direction towards the mold opening direction and drives the movable guide rod 8 to vertically slide when the movable module 1 transversely opens the mold; offer the chute of stepping down 21 that can supply base 6 to place on the fixed die block 2, base 6 can be along the chute of stepping down 21 lateral sliding and the bottom surface of base 6 is laminated with the lower cell wall of chute of stepping down 21 all the time.

As shown in fig. 3-6, a mounting groove 61 vertically penetrating through the base 6 is formed in one end of the base 6, one end of the connecting rod 7 is embedded into the mounting groove 61 and is hinged to the base 6, the mounting groove 61 is provided with an inward recessed abdicating opening 62, when the die sinking of the fixed module 2 and the movable module 1 is performed, the connecting rod 7 swings to be partially positioned in the abdicating opening 62, the base 6 is provided with a first fixed hole 63 and a second fixed hole 64 which are both positioned on one side of the connecting rod 7, the ejecting limit structure further comprises a positioning pin 9 and a fastener 10, the first fixed hole 63 is positioned at one end far away from the connecting rod 7, the fastener 10 is penetrated through the first fixed hole 63 from top to bottom and fixedly connects the movable module 1 and the base 6, and the positioning pin 9 penetrates through the second fixed hole 64 from bottom to top and is penetrated through the movable module 1 to position the movable module 1 and the base 6.

The setting of mounting groove 61, make the rotation of connecting rod 7 can be more smooth and easy, and the setting of the mouth 62 of stepping down, can make base 6 when guaranteeing structural strength, furthest steps down connecting rod 7, fastener 10 is from last to wearing to establish in fixed orifices 63 down, and locating pin 9 is from supreme wearing to establish in moving module 1 down, through the connection of upper and lower not equidirectional, avoided when base 6 takes place to rock, fastener 10 can provide ascending pulling force, and locating pin 9 can provide ascending support power, guaranteed that the connection between base 6 and the movable mould piece 1 is more stable, avoided fastener 10 to cause easily not hard up in long-term use, further promotion ejecting limit structure's stability.

As shown in fig. 1-3, a placement groove 22 communicated with the abdicating chute 21 is formed on the fixed module 2, one end of the movable guide rod 8 is located in the placement groove 22, a gap 22a is formed between the outer wall of the movable guide rod 8 and the side wall of the placement groove 22, a through hole 23 through which the movable guide rod 8 can penetrate is formed at the bottom of the placement groove 22 of the fixed module 2, the outer wall of the movable guide rod 8 is attached to the hole wall of the through hole 23, a radially outward protruding limit ring 81 is arranged at one end of the movable guide rod 8, the outer diameter of the limit ring 81 is larger than the diameter of the through hole 23, a notch 24 communicated with the through hole 23 is formed 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 formed between the movable guide rod 8 and the notch 24.

The setting in clearance 24a and space 22a for the upper and lower both ends of moving guide arm 8 do not all contact with decide module 2, and move the middle part of guide arm 8 and carry on spacingly through-hole 23, thereby can also reduce the friction between moving guide arm 8 and the deciding module 2 when guaranteeing the gliding stability of moving guide arm 8, need great power when having reduced movable module 1 die sinking, make the more laborsaving of die sinking of mould.

As shown in fig. 6, the movable guide rod 8 includes a connecting portion 82 hinged to the connecting rod 7 and an elongated portion 83 capable of abutting against the ejector plate 3, one end of the connecting portion 82 is fixedly connected to one end of the elongated portion 83, a threaded post 83a is formed at a protrusion of one end of the elongated portion 83, a threaded hole 82a is formed at one end of the connecting portion 82, and the threaded post 83a can be inserted into the threaded hole 82a to fixedly connect the connecting portion 82 and the elongated portion 83.

The connecting portion 82 and the extension portion 83 are arranged, so that when the ejection limiting structure needs to be applied to different molds, the extension portion 83 with different lengths can be replaced, the bottom of the extension portion 83 can be abutted to the ejection plate 3 in a mold closing state, and the applicability of the ejection limiting structure is enhanced.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (10)

1. A mold ejection limiting structure comprises a fixed module (2), a movable module (1) arranged along the transverse sliding direction and an ejector plate (3) which is positioned below the fixed module (2) and can vertically slide, wherein a molding cavity (4) is formed between the movable module (1) and the fixed module (2) in a mold closing manner, an ejector rod (5) for ejecting a product in the molding cavity (4) when the ejector plate (3) vertically slides is fixedly connected onto the ejector plate (3), the mold ejection limiting structure is characterized by comprising a base (6) fixed on the movable module (1) and a movable guide rod (8) which vertically slides to penetrate through the fixed module (2), a connecting rod (7) capable of driving the movable guide rod (8) to vertically move is arranged between the base (6) and the movable guide rod (8), and when the movable module (1) and the fixed module (2) are vertically pressed on the ejector plate (3) at the lower end of the movable guide rod (8) in a mold closing state, when the fixed module (2) and the movable module (1) are opened, the base (6) drives the connecting rod (7) to swing so as to enable the movable guide rod (8) to move upwards to be separated from the ejector plate (3).

2. The die ejection limiting structure according to claim 1, wherein one end of the connecting rod (7) is hinged to the base (6), the other end of the connecting rod (7) is hinged to the movable guide rod (8), the connecting rod (7) and the movable guide rod (8) are coaxially arranged in a die closing state of the movable die block (1) and the fixed die block (2), and the connecting rod (7) moves to be obliquely arranged towards a die opening direction along with the base (6) and drives the movable guide rod (8) to vertically slide when the movable die block (1) is opened transversely.

3. The mold ejection limiting structure according to claim 1, wherein the fixed mold block (2) is provided with an abdicating chute (21) for placing the base (6), the base (6) can transversely slide along the abdicating chute (21) and the bottom surface of the base (6) is always attached to the lower chute wall of the abdicating chute (21).

4. The mold ejection limiting structure according to claim 1, 2 or 3, wherein one end of the base (6) is provided with a mounting groove (61) vertically penetrating through the base (6), one end of the connecting rod (7) is embedded into the mounting groove (61) and hinged to the base (6), the mounting groove (61) is provided with an inward-recessed position-giving opening (62), and the connecting rod (7) swings to be partially positioned in the position-giving opening (62) when the fixed module (2) and the movable module (1) are opened.

5. The mold ejection limiting structure according to claim 1, 2 or 3, wherein the base (6) is provided with a first fixing hole (63) and a second fixing hole (64) which are both located on one side of the connecting rod (7), the mold ejection limiting structure further comprises a positioning pin (9) and a fastener (10), the first fixing hole (63) is located at one end far away from the connecting rod (7), the fastener (10) is arranged in the first fixing hole (63) in a penetrating manner from top to bottom and fixedly connects the movable module (1) with the base (6), and the positioning pin (9) passes through the second fixing hole (64) from bottom to top and is arranged in the movable module (1) in a penetrating manner to position the movable module (1) and the base (6).

6. The die ejection limiting structure according to claim 3, wherein a placing groove (22) communicated with the abdicating chute (21) is formed in the fixed die block (2), one end of the movable guide rod (8) is located in the placing groove (22), and a gap (22a) is formed between the outer wall of the movable guide rod (8) and the side wall of the placing groove (22).

7. The die ejection limiting structure according to claim 6, wherein the fixed die block (2) is provided with a through hole (23) at the bottom of the placing groove (22) for the movable guide rod (8) to penetrate through, the outer wall of the movable guide rod (8) is attached to the wall of the through hole (23), 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 die ejection limiting structure according to claim 7, wherein a notch (24) communicated with the through hole (23) is formed at the lower end of the fixed die block (2), the movable guide rod (8) is partially positioned in the notch (24), and a gap (24a) is formed between the movable guide rod (8) and the notch (24).

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

10. The die ejection limiting structure according to claim 9, wherein a threaded column (83a) is formed at one end of the elongated portion (83) in a protruding manner, a threaded hole (82a) is formed at one end of the connecting portion (82), and the threaded column (83a) can be embedded into the threaded hole (82a) to fixedly connect the connecting portion (82) and the elongated portion (83).

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