A spiral core pulling straight top mold

Abstract

The present invention proposes a spiral core-pulling straight-top mold, comprising a straight top head seat for forming undercut ribs and ejecting products, a delayed sliding mechanism connected to the straight top head seat and capable of controlling the movement of the straight top head seat, a spiral core-pulling mechanism for forming threaded holes, and a rack for synchronously completing the spiral core-pulling movement when the mold is opened; the delayed sliding mechanism comprises a straight ejector rod and a delayed straight top, and the spiral core-pulling mechanism comprises a screw sleeve, a screw rod and a gear, and the overall structure is relatively simple, which improves stability and reduces the overall volume, number of parts and difficulty of mold matching of multiple mechanisms; when the mold is opened, through the above-mentioned actions, spiral core pulling, product ejection and undercut rib core pulling are realized synchronously in the mold opening process, so that the mold opening steps are reduced, the production efficiency is high, and there is no need to independently set up a power source, which further reduces the overall volume, number of parts and difficulty of mold matching of the entire set of molds.

Description

Technical Field

[0001] The invention relates to the technical field of moulds, in particular to a spiral core-pulling straight-top mould. Background Art

[0002] The plastic products used in the automotive field have complex structures and require many features to be molded. The injection molds used are also relatively complex and often require core pulling mechanisms, ejection mechanisms, etc.

[0003] In the prior art, when producing plastic products with spiral holes and undercut ribs, it is necessary to independently set up a spiral core pulling mechanism, an undercut rib core pulling mechanism and an ejection mechanism. The independent spiral core pulling mechanism, undercut rib core pulling mechanism and ejection mechanism are all complex mechanisms, and the spiral core pulling mechanism and the undercut rib core pulling mechanism need to be configured with independent power sources. When these mechanisms collide in a set of molds, it will cause the entire mold structure to be complex, the mold matching to be difficult and the stability to be low; when opening the mold, the independent spiral core pulling mechanism and the undercut rib core pulling mechanism need to complete their own core pulling actions first, and then perform the mold opening and ejection actions, which makes the mold opening steps complicated and the processing efficiency low. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a spiral core-pulling straight-top mold with a simple overall structure, low mold matching difficulty, high stability, simple mold opening steps and high processing efficiency.

[0005] The technical solution adopted by the present invention to solve the above problem is: a spiral core-pulling straight top mold, comprising a front mold component and a rear mold component, wherein the front mold component comprises a front mold core, the rear mold component comprises a rear mold core, and an injection cavity for forming a product is provided between the front mold core and the rear mold core;

[0006] It also includes a straight head seat disposed on the front end face of the rear mold core and used for forming undercut ribs and ejecting products, a time-delay sliding mechanism disposed behind the straight head seat, a spiral core-pulling mechanism disposed in the straight head seat, and a rack disposed on the front end face of the rear mold core and used to cooperate with the spiral core-pulling mechanism;

[0007] Wherein, the time-delay sliding mechanism comprises a straight top rod fixedly connected to the straight top head seat, and a time-delay straight top arranged behind the straight top rod; the spiral core-pulling mechanism comprises a screw sleeve fixedly connected to the straight top head seat, a screw rod moving left and right in the screw sleeve, and a gear fixedly connected to the right end of the screw rod and matched with the rack;

[0008] When the mold is opened, the delayed straight top first pushes the straight ejector rod, the straight ejector head seat and the spiral core-pulling mechanism to move forward so that the straight ejector head seat can eject the product forward, and the rack drives the gear to rotate so as to drive the screw rod to move rightward to complete the spiral core-pulling; the delayed straight top then pushes the straight ejector rod, the straight ejector head seat and the spiral core-pulling mechanism to move rightward and forward so as to drive the straight ejector head seat to complete the inverted core-pulling.

[0009] Compared with the prior art, the present invention comprises a straight ejector head for forming undercut ribs and ejecting products, a delayed sliding mechanism connected to the straight ejector head and capable of controlling the movement of the straight ejector head, a spiral core-pulling mechanism for forming threaded holes, and a rack for synchronously completing the spiral core-pulling movement when the mold is opened; the delayed sliding mechanism comprises a straight ejector rod and a delayed straight ejector head, and the spiral core-pulling mechanism comprises a screw sleeve, a screw rod and a gear. The overall structure is relatively simple, and the mechanism for spiral core-pulling, the core-pulling mechanism for undercut ribs and the ejection mechanism are combined, and the movements of each other cooperate with each other when the mold is opened, thereby improving stability and reducing the overall volume, the number of parts, and the difficulty of mold matching of multiple mechanisms; when the mold is opened, the delayed straight ejector head first pushes the straight ejector rod, the straight ejector rod and the gear. The ejector seat and the spiral core-pulling mechanism move forward so that the straight ejector seat can eject the product forward. At the same time, the rack drives the gear to rotate so as to drive the screw rod to move rightward to complete the spiral core-pulling. The delayed straight top then pushes the straight ejector rod, the straight ejector seat and the spiral core-pulling mechanism to move rightward and forward so as to drive the straight ejector seat to complete the undercut core-pulling. Through the above actions, the spiral core-pulling, product ejection and undercut core-pulling are carried out simultaneously during the mold opening process, which reduces the mold opening steps and improves the production efficiency. The power for the spiral core-pulling, product ejection and undercut core-pulling all comes from the movement of the front mold assembly and the rear mold assembly, without the need to set up an independent power source, further reducing the overall volume of the entire mold, the number of parts, and the difficulty of mold matching.

[0010] The present invention provides a spiral core-pulling straight top mold, wherein the delayed straight top includes a delayed inclined guide column and a sliding straight top seat; the sliding straight top seat includes a delay slot hole set through; the delayed inclined guide column passes through the delay slot hole; when the mold is opened, the delayed inclined guide column moves from the left side wall of the delay slot hole to the right side wall, and the straight top rod, the straight top head seat and the spiral core-pulling mechanism move forward, and the delayed inclined guide column contacts the right side wall of the delay slot hole, and the straight top rod, the straight top head seat and the spiral core-pulling mechanism move to the right front.

[0011] The present invention provides a spiral core-pulling straight ejector mold, wherein the rear mold assembly includes a rear mold plate and an ejector plate arranged on the front side of the rear mold plate; the sliding straight ejector seat is arranged in the ejector plate; the delayed inclined guide column is fixedly connected to the front side of the rear mold plate; the delayed sliding mechanism further includes a guide block fixedly connected to the front side of the rear mold plate; the guide block includes a first guide inclined surface arranged on the left side, and the sliding straight ejector seat includes a second guide inclined surface arranged on the right side; the first guide inclined surface cooperates with the second guide inclined surface.

[0012] The invention discloses a spiral core-pulling straight ejection die, wherein the rear die core comprises a sliding groove which is arranged through the rear die core; the straight ejection rod passes through the sliding groove and can move left and right in the sliding groove.

[0013] The present invention provides a spiral core-pulling straight-top mold, wherein the straight-top head seat includes an ejection portion, a screw sleeve accommodating groove, a protrusion and a gear accommodating groove arranged in sequence from left to right; the ejection portion includes a first through hole arranged from left to right, and the protrusion includes a second through hole arranged from left to right.

[0014] The invention provides a spiral core-pulling straight ejection die, wherein the ejection portion comprises a first forming surface arranged on the left side, and a second forming surface arranged on the rear side.

[0015] A spiral core pulling straight top mold of the present invention, wherein the screw thread rod comprises a threaded hole forming section, a first shaft section, a thread section, a second shaft section and a third shaft section which are arranged continuously from left to right;

[0016] The first shaft segment is movably disposed in the first through hole;

[0017] The screw sleeve is fixedly connected to the screw sleeve receiving groove; the screw sleeve includes a driving hole, and the driving hole matches the threaded section;

[0018] The second shaft segment is movably disposed in the second through hole;

[0019] The gear is arranged in the gear accommodating groove and is arranged on the third shaft section.

[0020] A spiral core-pulling straight top mold of the present invention, wherein the spiral core-pulling mechanism further includes a limiting guide cover plate; the limiting guide cover plate is fixedly connected to the right end of the straight top head seat; the limiting guide cover plate includes a third through hole arranged therethrough; the central axes of the first through hole, the second through hole and the third through hole coincide, and the right end of the third shaft segment is arranged in the third through hole.

[0021] The present invention provides a spiral core-pulling straight-top mold, wherein during the forward movement of the straight-top rod, the straight-top head seat and the spiral core-pulling mechanism, the gear is driven by the rack to rotate 108°, and the screw rod moves 1.8 mm to the right under the action of the driving hole and the threaded segment.

[0022] The present invention provides a spiral core-pulling straight-top mold, wherein the straight-top head seat further includes a connecting block arranged at the rear, and the straight-top rod includes a connecting block arranged at the front end; the connecting block is fixedly connected to the connecting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the straight head seat, the delayed sliding mechanism and the spiral core pulling mechanism;

[0026] Figure 4 The exploded diagram of the straight headstock, delayed sliding mechanism and spiral core pulling mechanism;

[0027] Figure 5 This is an enlarged view of the straight headstock and the spiral core pulling mechanism;

[0028] Figure 6 It is an enlarged view of the delayed sliding mechanism;

[0029] Fig. 7A It is a side view of the first stage of the mold opening of the present invention;

[0030] Figure 7B This is a three-dimensional diagram of the first stage of mold opening of the present invention;

[0031] Fig. 8A It is a side view of the second stage of the mold opening of the present invention;

[0032] Figure 8B It is a stereogram of the second stage of mold opening of the present invention;

[0033] Fig. 9A It is a side view of the third stage of mold opening of the present invention;

[0034] Fig. 9B It is a three-dimensional diagram of the third stage of mold opening of the present invention;

[0035] Fig. 10A It is a side view of the fourth stage of mold opening of the present invention;

[0036] Fig. 10B It is a three-dimensional diagram of the fourth stage of mold opening of the present invention;

[0037] Fig.11 This is a side view of the cooperation between the straight head seat, spiral core pulling mechanism and the product;

[0038] Fig.12 Another side view of the cooperation between the straight headstock, spiral core pulling mechanism and the product;

[0039] In the figure, the front mold assembly 1, the rear mold assembly 2, the straight top head seat 3, the delayed sliding mechanism 4, the spiral core pulling mechanism 5, the rack 6, the product 7; the front mold core 11; the rear mold core 21, the rear mold plate 22, the ejector plate 23; the ejector part 31, the screw sleeve receiving groove 32, the protrusion 33, the gear receiving groove 34, the connecting seat 35; the straight ejector rod 41, the delayed straight top 42, the guide block 43; the screw sleeve 51, the screw rod 52, the gear 53, the limit guide cover plate 54; the threaded hole 71, the reverse Buckle rib 72; sliding groove 211; first through hole 311, first forming surface 312, second forming surface 313; second through hole 331; connecting block 411; time-delay inclined guide column 421, sliding straight top seat 422; first guide inclined surface 431; driving hole 511; threaded hole forming section 521, first shaft section 522, threaded section 523, second shaft section 524, third shaft section 525; third through hole 541; time-delay slot hole 4221, second guide inclined surface 4222. DETAILED DESCRIPTION

[0040] Before describing in detail any embodiment of the present invention, it should be understood that the present invention is not limited in its application to the construction and arrangement details of the components described below or illustrated in the following figures. The present invention can have other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used here are for descriptive purposes and should not be considered restrictive. The use of "including" or "having" and its variations herein is intended to cover the items and their equivalents and additional items displayed below. Unless otherwise specified or limited, the terms "install", "connect", "support" and "couple" and their variations are widely used and cover direct installation and indirect installation, connection, support and connection. In addition, "connect" and "couple" are not limited to physical or mechanical connections or connections.

[0041] Furthermore, on the first aspect, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second aspect, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.

[0042] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

[0043] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0044] See also Figure 1-12 A spiral core-pulling straight-ejection mold shown in the figure includes a front mold component 1 and a rear mold component 2, wherein the front mold component 1 includes a front mold core 11, and the rear mold component 2 includes a rear mold core 21, and an injection cavity for forming a product 7 is provided between the front mold core 11 and the rear mold core 21; it also includes a straight ejection head seat 3 arranged on the front end surface of the rear mold core 21 and used for forming an undercut rib 72 and ejecting the product 7, a time-delay sliding mechanism 4 arranged behind the straight ejection head seat 3, a spiral core-pulling mechanism 5 arranged in the straight ejection head seat 3, and a rack 6 arranged on the front end surface of the rear mold core 21 and used for cooperating with the spiral core-pulling mechanism 5; wherein the time-delay sliding mechanism 4 includes a straight ejection rod 41 fixedly connected to the straight ejection head seat 3, and a rack 6 arranged on the front end surface of the rear mold core 21 and used for cooperating with the spiral core-pulling mechanism 5. 1; the spiral core-pulling mechanism 5 includes a screw sleeve 51 fixedly connected to the straight top seat 3, a screw rod 52 moving left and right in the screw sleeve 51, and a gear 53 fixedly connected to the right end of the screw rod 52 and matched with the rack 6; when opening the mold, the delayed straight top 42 first pushes the straight top rod 41, the straight top seat 3 and the spiral core-pulling mechanism 5 to move forward, so that the straight top seat 3 can push out the product 7 forward, and the rack 6 drives the gear 53 to rotate, so as to drive the screw rod 52 to move rightward to complete the spiral core-pulling; the delayed straight top 42 then pushes the straight top rod 41, the straight top seat 3 and the spiral core-pulling mechanism 5 to move rightward and forward, so as to drive the straight top seat 3 to complete the undercut core-pulling.

[0045] In actual use, the present invention includes a straight head seat 3 for forming undercut ribs 72 and ejecting products 7, a delayed sliding mechanism 4 connected to the straight head seat 3 and capable of controlling the movement of the straight head seat 3, a spiral core pulling mechanism 5 for forming threaded holes 71, and a rack 6 for synchronously completing the spiral core pulling movement when the mold is opened; the delayed sliding mechanism 4 includes a straight ejector rod 41 and a delayed straight top 42, and the spiral core pulling mechanism 5 includes a screw sleeve 51, a screw rod 52 and a gear 53. The overall structure is relatively simple, and the mechanism for spiral core pulling, the core pulling mechanism for the undercut rib and the ejection mechanism are combined, and the movements of each other cooperate with each other when the mold is opened, thereby improving stability and reducing the overall volume, number of parts, and difficulty of mold matching of the two mechanisms; when the mold is opened, the delayed straight top 42 first pushes the straight ejector rod 4 1. The straight top seat 3 and the spiral core-pulling mechanism 5 move forward so that the straight top seat 3 can eject the product 7 forward. At the same time, the rack 6 drives the gear 53 to rotate so as to drive the screw rod 52 to move rightward to complete the spiral core-pulling; the delayed straight top 42 then pushes the straight top rod 41, the straight top seat 3 and the spiral core-pulling mechanism 5 to move rightward and forward so as to drive the straight top seat 3 to complete the undercut core-pulling; through the above actions, the spiral core-pulling, product 7 ejection and undercut core-pulling are carried out simultaneously during the mold opening process, so that the mold opening steps are reduced and the production efficiency is higher, and the power for the spiral core-pulling, product 7 ejection and undercut core-pulling all come from the movement of the front mold assembly 1 and the rear mold assembly 2, without the need to set up an independent power source, further reducing the overall volume of the entire mold, the number of parts, and the difficulty of mold matching.

[0046] Please continue reading Figure 3 , Figure 4 , Figure 6 , wherein the delayed straight top 42 includes a delayed inclined guide column 421 and a sliding straight top seat 422; the sliding straight top seat 422 includes a delay slot 4221 that is set through; the delayed inclined guide column 421 passes through the delay slot 4221; when the mold is opened, the delayed inclined guide column 421 runs from the left side wall to the right side wall of the delay slot 4221, and the straight top rod 41, the straight top head seat 3 and the spiral core pulling mechanism 5 move forward. During the contact between the delayed inclined guide column 421 and the right side wall of the delay slot 4221, the straight top rod 41, the straight top head seat 3 and the spiral core pulling mechanism 5 move to the right front.

[0047] When in use, the delayed inclined guide column 421 is fixed. In the process of relative movement of the delayed inclined guide column 421 from the left side wall of the delay slot hole 4221 to the right side wall, the delayed inclined guide column 421 does not generate a force with the sliding straight top seat 422, thereby playing a delay role. Therefore, at this stage, the sliding straight top seat 422 can drive the straight top rod 41, the straight top head seat 3 and the spiral core pulling mechanism 5 to move forward, thereby completing the ejection action and the spiral core pulling action; when the delayed inclined guide column 421 contacts the right side wall of the delay slot hole 4221 and continues to move forward, it will be subjected to the force generated by the delayed inclined guide column 421, causing the sliding straight top seat 422 to move to the right front along the central axis of the delayed inclined guide column 421, thereby completing the core pulling action of the undercut rib 72.

[0048] Please read further Figure 3 , Figure 4 , Figure 6 , wherein the rear mold assembly 2 includes a rear mold plate 22, and a pin plate 23 arranged on the front side of the rear mold plate 22; a sliding straight ejector seat 422 is arranged in the ejector plate 23; a delay inclined guide pin 421 is fixedly connected to the front side of the rear mold plate 22; the delay sliding mechanism 4 further includes a guide block 43 fixedly connected to the front side of the rear mold plate 22; the guide block 43 includes a first guide inclined surface 431 arranged on the left side, and the sliding straight ejector seat 422 includes a second guide inclined surface 4222 arranged on the right side; the first guide inclined surface 431 matches the second guide inclined surface 4222.

[0049] When in use, the rear template 22 is fixed so as to provide reliable fixation for the delayed inclined guide column 421 and the guide block 43; a plurality of groups of ejectors for ejecting the product 7 are connected to the ejector plate 23, and the ejector plate 23 cooperates with the front mold assembly 1 so as to move forward synchronously with the front mold assembly 1 to complete the ejection action of the product 7 when the mold is opened; the sliding straight ejector seat 422 is arranged in the ejector plate 23, so that when the mold is opened, the sliding straight ejector seat 422 is driven to move forward by the mold opening power of the front mold assembly 1 itself; the design of the guide block 43 realizes the cooperation between the first guiding inclined surface 431 and the second guiding inclined surface 4222, so that when the sliding straight ejector seat 422 moves to the right front, it realizes the guiding effect synchronously with the delayed inclined guide column 421, thereby making the movement more stable.

[0050] Furthermore, in this embodiment, Figure 6 The two sides of the sliding straight top seat 422 are provided with slide rails. Figure 3 The ejector plate 23 shown is composed of two plate bodies arranged front and back, wherein a slide groove cooperating with the slide rail is provided in the plate body located at the rear, which is used to realize the left and right movement of the sliding straight ejector seat 422, so that the sliding straight ejector seat 422 can move forward, and can move to the right front after being affected by the delayed inclined guide column 421 and the guide block 43.

[0051] Please continue reading Fig.11 , Fig.12 , wherein the rear mold core 21 includes a sliding groove 211 that is arranged therethrough; the straight push rod 41 passes through the sliding groove 211 and can move left and right in the sliding groove 211.

[0052] When in use, the width of the sliding groove 211 is greater than the width of the straight push rod 41. When the straight push rod 41 moves to the right front, the larger width can provide space for the straight push rod 41 to move left and right, so that the straight push rod 41 drives the straight push head seat 3 and the spiral core pulling mechanism 5 to complete the action.

[0053] Please read further Figure 3 , Figure 4 , Figure 5 The straight head seat 3 includes an ejector portion 31, a screw sleeve receiving groove 32, a protrusion 33 and a gear receiving groove 34 which are sequentially arranged from left to right; the ejector portion 31 includes a first through hole 311 which is arranged from left to right, and the protrusion 33 includes a second through hole 331 which is arranged from left to right.

[0054] When in use, the ejector portion 31 is in contact with the product 7 . When the straight ejector head seat 3 moves forward, the ejector portion 31 cooperates with the ejector plate 23 to eject the product 7 .

[0055] Please continue reading Fig.11 , Fig.12 , wherein the ejection portion 31 includes a first forming surface 312 disposed on the left side and a second forming surface 313 disposed on the rear side.

[0056] When in use, the first forming surface 312 is used to form the features of the curved surface where the threaded hole 71 in the product 7 is located, and the second forming surface 313 is used to form the features of the undercut rib 72 in the product 7.

[0057] Please continue reading Figure 3 , Figure 4 , Figure 5 , Fig.11 , Fig.12 , wherein the screw rod 52 includes a threaded hole forming section 521, a first shaft section 522, a threaded section 523, a second shaft section 524 and a third shaft section 525 which are arranged continuously from left to right;

[0058] The threaded hole forming section 521 is used to form the features of the threaded hole 71 in the product 7;

[0059] The first shaft section 522 is movably disposed in the first through hole 311 to limit one end of the screw rod 52 so that the screw rod 52 can only move left and right along the axis.

[0060] The screw sleeve 51 is fixedly connected to the screw sleeve receiving groove 32; the screw sleeve 51 includes a driving hole 511, and the driving hole 511 cooperates with the threaded section 523; when in use, the screw sleeve 51 is fixed in the screw sleeve receiving groove 32, and when the screw rod 52 rotates, the driving hole 511 cooperates with the threaded section 523 to achieve left and right movement of the screw rod 52, thereby completing the spiral core pulling or resetting action;

[0061] The second shaft section 524 is movably disposed in the second through hole 331 so as to limit the middle section of the screw rod 52 so that the screw rod 52 can only move left and right along the axis.

[0062] The gear 53 is arranged in the gear accommodating groove 34 and is arranged on the third shaft section 525; when in use, the gear 53 and the gear accommodating groove 34 are not in contact, and the gear 53 and the third shaft section 525 are matched through a key and a keyway. When the gear 53 is driven to rotate by the rack 6, the screw rod 52 can be driven to rotate synchronously.

[0063] Please continue reading Figure 4 , Figure 5 , wherein the spiral core pulling mechanism 5 further includes a limiting guide cover plate 54; the limiting guide cover plate 54 is fixedly connected to the right end of the straight head seat 3; the limiting guide cover plate 54 includes a third through hole 541 that is arranged through; the central axes of the first through hole 311, the second through hole 331 and the third through hole 541 coincide with each other, and the right end of the third shaft segment 525 is arranged in the third through hole 541.

[0064] When in use, the movement of the screw rod 52 can be limited by the setting of the limiting guide cover plate 54, and the other end of the screw rod 52 can be limited by the setting of the third through hole 541, so that the screw rod 52 can only move left and right along the axis. The setting of the first through hole 311, the second through hole 331 and the third through hole 541 with the axes of the two holes overlapping can make the operation of the screw rod 52 more stable.

[0065] Please continue reading Figure 1-12 In some embodiments, when the straight push rod 41, the straight push head seat 3 and the spiral core pulling mechanism 5 move forward, the gear 53 is driven by the rack 6 to rotate 108°, and the screw rod 52 moves 1.8 mm to the right under the action of the driving hole 511 and the threaded segment 523.

[0066] In this embodiment, the gear 53 rotates 108°, which is a smaller angle, and the screw rod 52 moves 1.8 mm. The moving distance is shorter and can meet the needs of spiral core pulling. Compared with multi-angle and long-distance movements, the structure is simpler and more stable.

[0067] Please continue reading Figure 4, wherein the straight top head seat 3 further includes a connecting seat 35 arranged at the rear, and the straight top rod 41 includes a connecting block 411 arranged at the front end; the connecting block 411 is fixedly connected to the connecting seat 35; through the cooperation between the connecting block 411 and the connecting seat 35, the straight top head seat 3 and the straight top rod 41 form a reliable connection, so that the straight top rod 41 can complete the action with the straight top head seat 3.

[0068] like Fig. 7A , 7B , 8A, 8B, 9A, 9B, 10A, 10B, the mold opening process of the present invention can be divided into four stages, specifically:

[0069] like Fig. 7A , 7B The figure shows the first stage of mold opening of the present invention, at which the front mold assembly 1 and the rear mold assembly 2 are in a closed state, the time-delay inclined guide column 421 is in contact with the left side wall of the time-delay slot hole 4221, the sliding straight ejector seat 422, the straight ejector rod 41, the straight ejector head seat 3 and the spiral core-pulling mechanism 5 have a tendency to move along the A direction, and the spiral core-pulling mechanism 5 has a tendency to move along the B direction in cooperation with the rack 6;

[0070] like Fig. 8A , 8B The figure shows the second stage of mold opening of the present invention, at which the front mold assembly 1 moves forward for a distance and the delayed inclined guide column 421 fits with the right side wall of the delayed slot hole 4221, and at the same time drives the sliding straight ejector seat 422, the straight ejector rod 41, the straight ejector head seat 3 and the spiral core pulling mechanism 5 to move along the A direction for a synchronous distance, and the product 7 is ejected by the ejector plate 23 and the ejection part 31 for a synchronous distance, and driven by the rack 6, the screw rod 52 moves along the B direction for a distance, thereby completing the ejection and spiral core pulling actions;

[0071] like Fig. 9A , 9B The third stage of mold opening of the present invention is shown, at this time, the front mold assembly 1 continues to move forward for a distance, and the sliding straight ejector seat 422 drives the straight ejector rod 41, the straight ejector head seat 3 and the spiral core pulling mechanism 5 to move a distance along the C direction under the joint action of the delayed inclined guide pillar 421 and the guide block 43, so that the ejector portion 31 is disengaged from the product 7;

[0072] like Fig. 10A , 10B The figure shows the fourth stage of mold opening of the present invention. At this time, the front mold assembly 1 continues to move forward for a distance, and the sliding straight ejector seat 422, under the joint action of the delayed inclined guide column 421 and the guide block 43, drives the straight ejector rod 41, the straight ejector head seat 3 and the spiral core pulling mechanism 5 to continue to move for a distance along the C direction, so that the ejection part 31 is further disengaged from the product 7, and the undercut rib 72 is completely disengaged, thereby completing the demolding.

[0073] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A spiral core-pulling straight-top mold, comprising a front mold assembly (1) and a rear mold assembly (2), wherein the front mold assembly (1) comprises a front mold core (11), the rear mold assembly (2) comprises a rear mold core (21), and an injection cavity for forming a product is provided between the front mold core (11) and the rear mold core (21), wherein: It also includes a straight head seat (3) arranged on the front end surface of the rear mold core (21) and used for forming undercut ribs and ejecting products, a time-delay sliding mechanism (4) arranged behind the straight head seat (3), a spiral core pulling mechanism (5) arranged in the straight head seat (3), and a rack (6) arranged on the front end surface of the rear mold core (21) and used for cooperating with the spiral core pulling mechanism (5); The delayed sliding mechanism (4) comprises a straight top rod (41) fixedly connected to the straight top head seat (3), and a delayed straight top portion (42) arranged behind the straight top rod (41); the spiral core pulling mechanism (5) comprises a screw sleeve (51) fixedly connected to the straight top head seat (3), a screw rod (52) movable left and right in the screw sleeve (51), and a gear (53) fixedly connected to the right end of the screw rod (52) and matched with the rack (6); The straight head seat (3) comprises an ejector portion (31), a screw sleeve receiving groove (32), a protrusion (33) and a gear receiving groove (34) which are arranged in sequence from left to right; the ejector portion (31) comprises a first through hole (311) which is arranged through from left to right, and the protrusion (33) comprises a second through hole (331) which is arranged through from left to right; The ejection portion (31) comprises a first forming surface (312) arranged on the left side, and a second forming surface (313) arranged on the rear side; The time-delay straight top (42) comprises a time-delay inclined guide column (421) and a sliding straight top seat (422); the sliding straight top seat (422) comprises a time-delay slot hole (4221) provided therethrough; the time-delay inclined guide column (421) passes through the time-delay slot hole (4221); When the mold is opened, the delayed straight top (42) first pushes the straight push rod (41), the straight push head seat (3) and the spiral core pulling mechanism (5) to move forward, so that the straight push head seat (3) can push the product forward, and the rack (6) drives the gear (53) to rotate, so as to drive the screw rod (52) to move rightward to complete the spiral core pulling; the delayed straight top (42) then pushes the straight push rod (41), the straight push head seat (3) and the spiral core pulling mechanism (5) to move rightward and forward, so as to drive the straight push head seat (3) to complete the undercut core pulling.

2. The spiral core-pulling straight top mold according to claim 1, characterized in that: When the mold is opened, when the delayed inclined guide column (421) moves from the left side wall to the right side wall of the delayed slot hole (4221), the straight push rod (41), the straight push head seat (3) and the spiral core pulling mechanism (5) move forward, and when the delayed inclined guide column (421) contacts the right side wall of the delayed slot hole (4221), the straight push rod (41), the straight push head seat (3) and the spiral core pulling mechanism (5) move to the right front.

3. The spiral core pulling straight top mold according to claim 2, characterized in that: The rear mold assembly (2) comprises a rear mold plate (22), and an ejector plate (23) arranged on the front side of the rear mold plate (22); the sliding straight ejector seat (422) is arranged in the ejector plate (23); the delayed inclined guide column (421) is fixedly connected to the front side of the rear mold plate (22); the delayed sliding mechanism (4) further comprises a guide block (43) fixedly connected to the front side of the rear mold plate (22); the guide block (43) comprises a first guide inclined surface (431) arranged on the left side, and the sliding straight ejector seat (422) comprises a second guide inclined surface (4222) arranged on the right side; the first guide inclined surface (431) matches the second guide inclined surface (4222).

4. The spiral core-pulling straight top mold according to claim 2, characterized in that: The rear mold core (21) comprises a sliding groove (211) extending therethrough; the straight push rod (41) passes through the sliding groove (211) and can move left and right in the sliding groove (211).

5. The spiral core-pulling straight top mold according to claim 1, characterized in that: The screw rod (52) comprises a threaded hole forming section (521), a first shaft section (522), a threaded section (523), a second shaft section (524) and a third shaft section (525) which are arranged continuously from left to right; The first shaft segment (522) is movably disposed in the first through hole (311); The screw sleeve (51) is fixedly connected to the screw sleeve receiving groove (32); the screw sleeve (51) comprises a driving hole (511), and the driving hole (511) cooperates with the threaded section (523); The second shaft segment (524) is movably disposed in the second through hole (331); The gear (53) is disposed in the gear accommodating groove (34) and is disposed on the third shaft section (525).

6. The spiral core-pulling straight top mold according to claim 5, characterized in that: The spiral core-pulling mechanism (5) further comprises a limiting guide cover plate (54); the limiting guide cover plate (54) is fixedly connected to the right end of the straight head seat (3); the limiting guide cover plate (54) comprises a third through hole (541) arranged therethrough; the central axes of the first through hole (311), the second through hole (331) and the third through hole (541) coincide with each other, and the right end of the third shaft segment (525) is arranged in the third through hole (541).

7. The spiral core-pulling straight top mold according to claim 6, characterized in that: During the forward movement of the straight push rod (41), the straight push head seat (3) and the spiral core pulling mechanism (5), the gear (53) is driven by the rack (6) to rotate 108°, and the screw rod (52) moves 1.8 mm to the right under the action of the drive hole (511) and the threaded section (523).

8. The spiral core-pulling straight top mold according to claim 1, characterized in that: The straight push head seat (3) further comprises a connection seat (35) arranged at the rear, and the straight push rod (41) comprises a connection block (411) arranged at the front end; the connection block (411) is fixedly connected to the connection seat (35).

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