A twice-motion retracted row structure

Abstract

This utility model relates to the field of two-color injection molding demolding technology, and in particular to a two-movement internal sliding structure, including a fixed mold core group and two moving mold core groups; the fixed mold core group is provided with a movable sliding structure; the sliding structure includes an inner sliding seat, an outer sliding seat, and an internally retracting sliding seat that are assembled together; when the first moving mold core and the fixed mold core are combined for injection molding, they contact the sliding structure and move the sliding structure to its initial position; the inner sliding seat is provided with an elastic block, and the second moving mold core is provided with an inclined guide post that presses the elastic block to retract, and the elastic block is reset and ejected when the mold is closed; when the second moving mold core and the fixed mold core group are opened, the inclined guide post presses the elastic block to drive the sliding structure to move gradually. In this technology, the internally retracting sliding structure, when the mold is opened after the first injection, the sliding position is maintained in the initial position, and when the mold is opened after the second injection, the sliding position can move twice in the horizontal and vertical directions, thereby completing the smooth demolding after the second injection.

Description

Technical Field

[0001] This utility model relates to the field of two-color injection molding demolding technology, and in particular to an inward retraction sliding structure with two movements. Background Technology

[0002] Normally, injection molding is understood to be single-color (i.e., single-color injection molding process). Single-color injection molding means that only one type of plastic raw material is used in one injection molding cycle to produce a single-color plastic product. Therefore, if different colors are desired, a new mold must be made to produce single-color plastic products, which are then assembled. Two-color injection molding, on the other hand, involves two different colors or materials being injection molded on the same injection molding machine in two separate processes. However, the product only needs to exit the mold once. In other words, two-color injection molding uses two different colors or two different materials of plastic in the same injection molding process, and through multiple injection operations, a plastic product composed of two different materials or colors is ultimately formed.

[0003] Therefore, when producing plastic products made of two different materials or color combinations, a two-color injection molding process is used.

[0004] In the production process, many small products are often designed with inward recesses. While this design helps improve the structural stability and functionality of the product, it can also pose challenges to the demolding process. In two-color molds, after the first injection of the hard plastic, the ejector slide cannot be ejected outwards; it can only be ejected after the second injection. Furthermore, existing mold designs only offer demolding in one direction (e.g., horizontal demolding) and cannot simultaneously demold in multiple directions, such as vertical simultaneous demolding. This design limits the mold's adaptability and increases the difficulty and complexity of demolding. Therefore, to achieve simultaneous demolding of two ejector slides, a two-movement inward recessed slide structure design can be introduced to optimize the demolding path. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a two-movement inward sliding mechanism, comprising a fixed mold core assembly and at least two moving mold core assemblies, a first moving mold core and a second moving mold core, wherein multiple moving mold core assemblies can be switched to cooperate with the fixed mold core assembly to form an injection cavity, realizing a mold closing injection molding process; the fixed mold core assembly is provided with a sliding area, and the sliding area is provided with a movable sliding structure; the sliding structure includes an inner sliding seat, an outer sliding seat, and an inward sliding seat that are assembled together and can move synchronously along the X-axis direction; the outer sliding seat is provided with a horizontal limiting part for the inner sliding seat to move along the X-axis direction thereon, and a part provided with... A vertical limiting part for the inner sliding seat to move along the Z-axis direction; when the first moving mold core and the fixed mold core are combined for injection molding, they contact the sliding structure and move the sliding structure to the initial position; when the first moving mold core and the fixed mold core assembly open the mold, the sliding structure is in the initial position; wherein, the inner sliding seat is provided with an elastic block that extends and retracts along the Y-axis direction, and the second moving mold core is provided with an inclined guide post that presses the elastic block inward and closes the mold with the fixed mold core assembly, and the elastic block is reset and popped out when the mold is closed; during the opening of the mold with the second moving mold core and the fixed mold core assembly, the inclined guide post presses the elastic block to drive the sliding structure to gradually move between the first sliding position and the second sliding position.

[0007] Furthermore, the inner sliding seat is installed inside the outer sliding seat; the inner side of the outer sliding seat is provided with an inner sliding rail, and the outer side of the inner sliding seat is provided with a limiting transmission block that moves along the X-axis and is placed on the sliding rail; the inner sliding rail is provided with a front limiting block that can abut against the limiting transmission block; the inner sliding seat is installed on the back of the inner sliding seat, and the back of the inner sliding seat and the inner sliding seat are connected by an oblique transmission; the outer sliding seat is provided with a vertical groove in the Z-axis direction, and the inner sliding seat is provided with a rear limiting block that is accommodated in the vertical groove and can abut against the limiting transmission block.

[0008] Furthermore, when the sliding structure is in its initial position, the limiting transmission block abuts against the rear limiting block, and a gap is left between the lower end of the rear limiting block and the bottom of the vertical groove.

[0009] Furthermore, in the initial position, the limiting transmission block and the rear limiting block are in contact, and the distance between the limiting transmission block and the front limiting block is the horizontal limiting part; the gap distance between the lower end of the limiting block and the bottom of the vertical groove is the vertical limiting part, and the parallel position structure is in the first row position.

[0010] Furthermore, an outer sliding track is provided on the outer side of the outer slide seat, and a limiting guide block is provided on the inner side of the fixed mold core assembly in the slide area to cooperate with the outer sliding track. An outer limiting block is provided at the opposite position of the outer sliding track relative to the front limiting block. When the limiting transmission block abuts against the front limiting block, the distance between the limiting guide block and the outer limiting block is the second slide interval.

[0011] Furthermore, the lower end of the first moving mold core is provided with a shovel base that is obliquely driven to the outer seat.

[0012] Furthermore, the lower end of the second moving mold core is provided with a shovel base two that drives obliquely to the outer seat. When the second moving mold core and the fixed mold core assembly are closed, the second oblique guide post and the elastic block are in an arc-shaped contact and extrusion state. When the second moving mold core and the fixed mold core assembly are closed, the second oblique guide post and the elastic block are in a hard contact and pushing state.

[0013] Furthermore, the inner mounting seat is provided with an assembly elastic block and an inclined slot for accommodating the inclined guide post. The elastic block is assembled inside the inner mounting seat in the inclined slot. The elastic block includes a block with a back groove, and a spring is provided at the groove of the block to connect with the side of the inner mounting seat.

[0014] Furthermore, the first moving mold core and the second moving mold core are provided with injection channels that communicate with the outside world and the injection cavity formed when the mold is closed.

[0015] Furthermore, the first moving mold core and the second moving mold core are provided with clearance grooves to accommodate the vertical protrusion of the retractable sliding seat.

[0016] The beneficial effects of this utility model are:

[0017] This inward-shrinking slide structure allows the slide to remain in its initial position during the first injection molding process and to move horizontally and vertically during the second injection molding process, thus enabling smooth demolding after the second injection molding.

[0018] This inward-shrinking sliding structure mainly achieves two movements as a whole. In the first injection molding, the outer sliding seat is pushed obliquely by the shovel base on the first moving mold core, so that the inner sliding seat, outer sliding seat, and inward-shrinking sliding seat move to the initial position. After the first injection molding is completed, the first movement between the first sliding seats and the second movement between the second sliding seats are achieved by the oblique guide post on the second moving mold core and the oblique pusher on the elastic block in the inner sliding seat.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of two sets of moving mold cores and fixed mold cores.

[0021] Figure 2 This is a schematic diagram of the combined mold structure of the first moving mold core and the fixed mold core.

[0022] Figure 3 This is a schematic diagram of the combined mold structure of the second moving mold core and the fixed mold core.

[0023] Figure 4 This is a schematic diagram of the bottom structure of the first moving mold core and the second moving mold core.

[0024] Figure 5 For based on Figure 3 Diagram of the decomposition structure.

[0025] Figure 6 This is a schematic diagram of the overall row-position structure.

[0026] Figure 7 A schematic diagram of the decomposition structure of the row and positional structures.

[0027] Figure 8 This is a schematic diagram of the row-position structure at its initial position.

[0028] Figure 9 This is a schematic diagram of the movement structure at the position where the limiting transmission block and the front limiting block abut.

[0029] Figure 10 This is a schematic diagram of the structure at the contact point between the outer seat and the outer limit block.

[0030] The labels in the attached figures are as follows:

[0031] Mold core assembly-1 Slide area-11, limit guide block-12 First moving part-2 Shovel Foundation 1-21 Second Motion Core-3 Inclined guide post-31, shovel base 2-32 Linear structure - 4 Inner travel seat-41, Outer travel seat-42, Retractable travel seat-43, Elastic block-44, Horizontal limiting part-45, Vertical limiting part-46 Inner sliding track-421, limiting transmission block-411, front limiting block-422, vertical groove-423, rear limiting block-431, outer sliding track-424, outer limiting block-425, inclined groove-412, block-441, spring-442 Injection Flow Channel-5 Avoidance slot-6 Detailed Implementation

[0032] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] Please see Figures 1-10This utility model includes a fixed mold core assembly 1 and at least two moving mold core assemblies: a first moving mold core 2 and a second moving mold core 3. Multiple moving mold core assemblies can be switched to cooperate with the fixed mold core assembly 1 to form an injection cavity, realizing a mold-closing injection molding process. The fixed mold core assembly 1 has a sliding area 11, and the sliding area 11 has a movable sliding structure 4. The sliding structure 4 includes an inner sliding seat 41, an outer sliding seat 42, and an inwardly retracting sliding seat 43, which are assembled together and can move synchronously along the X-axis. The outer sliding seat 42 has a horizontal limiting part 45 for the inner sliding seat 41 to move along the X-axis, and a part for the inwardly retracting sliding seat 43 to move along the Z-axis. The vertical limiting part 46; when the first moving mold core 2 and the fixed mold core group 1 are closed for injection molding, they contact the sliding structure 4 and move the sliding structure 4 to the initial position; when the first moving mold core 2 and the fixed mold core group 1 are opened, the sliding structure 4 is in the initial position; wherein, the inner sliding seat 41 is provided with an elastic block 44 that extends and retracts along the Y-axis direction, and the second moving mold core 3 is provided with an inclined guide post 31 that presses the elastic block 44 inward and closes with the fixed mold core group 1. When the mold is closed, the elastic block 44 is reset and popped out; when the second moving mold core 3 and the fixed mold core group 1 are opened, the inclined guide post 31 presses the elastic block 44 to drive the sliding structure 4 to gradually move to the first sliding space and the second sliding space.

[0034] First, it should be noted that the inward sliding structure 4 is mainly a part of the overall mold. The injection cavity is mainly the outer surrounding part of the principle axis of the fixed mold core group 1 as shown in the figure, and the sliding structure 4 is located near the axis of the inward sliding structure 4.

[0035] Example 1:

[0036] Preferably, this two-color injection mold is configured with a fixed mold core group 1 and two moving mold core groups, namely a first moving mold core 2 and a second moving mold core 3. The two moving mold core groups can be moved to the same plane as the fixed mold core group 1 by external assembly equipment using a translational or rotational conversion method. For example, the switching position of the first moving mold core 2 and the second moving mold core 3 can be realized by connecting external assembly equipment such as pneumatic system or mechanical drive device. Specifically, one of the moving mold cores is first moved to the fixed mold core group 1 to perform the mold closing injection process. After the mold is separated, the other moving mold core is switched to the fixed mold core group 1 to perform the mold closing injection process. This process is repeated to complete the two-color mold closing injection process.

[0037] Regarding the structural design of the two moving mold cores:

[0038] The lower end of the first moving mold core 2 is provided with a shovel base 21. The shovel base 21 is used to apply force to the sliding structure 4 in the sliding area 11 of the fixed mold core group 1, so that the sliding structure 4 moves to the initial position, and then the first injection molding is achieved through the injection channel 5 on the first moving mold core 2.

[0039] The lower end of the second moving mold core 3 is provided with a shovel base 32 and an inclined guide post 31. When the second moving mold core 3 and the fixed mold core assembly 1 are closed, the inclined guide post 31 first pushes the elastic block 44 inward, so that the inclined guide post 31 enters the inclined groove 412 in the inner slide seat 41 during mold closing. While the slide structure 4 remains in its initial position, the mold closing of the second moving mold core 3 and the fixed mold core assembly 1 is completed, and then the second injection is achieved through the injection channel 5 on the second moving mold core 3. When the mold is opened, the inclined guide post 31 applies force to the elastic block 44, causing the slide structure 4 to move as a whole. During the overall movement of the slide structure 4, its inward sliding seat 43 will move down and inward between the first slides, thus facilitating the demolding of the two-color injection molded product with undercut.

[0040] Regarding the design of the slide structure 4, the slide structure 4 is installed between the slide area 11 and the injection cavity, and the mold closing and mold opening demolding process is realized through displacement.

[0041] The sliding structure 4 mainly includes four parts: inner sliding seat 41, outer sliding seat 42, inner retractable sliding seat 43, and elastic block 44, which are assembled together.

[0042] For the outer row seat 42 structure design, the middle part is a receiving groove for accommodating the inner row seat 41, the front end is an inclined surface that is inclined to drive the first moving mold core 2 and the second moving mold core 3, the back is provided with a vertical groove 423 for assembling the inner retractable row seat 43, and the inner side near the receiving groove is provided with an inner sliding track 421.

[0043] The inner sliding seat 41 has a central section consisting of an elastic block 44 and an inclined slot 412 for accommodating the inclined guide post 31. The elastic block 44 is assembled inside the inner sliding seat 41 in the inclined slot 412. The elastic block 44 includes a block 441 with a slotted back. A spring 442 connected to the side of the inner sliding seat 41 is provided at the slot of the block 441. Its front end is an inclined surface that is inclined to drive the first moving mold core 2 and the second moving mold core 3. Its back end is provided with an inclined guide rail that is inclined to drive the inner sliding seat 43. At the same time, a limiting transmission block 411 is provided on the outer side of the inner sliding seat 41, which is placed on the sliding rail and moves along the X-axis. That is, through the cooperation of the inner sliding rail 421 and the limiting transmission block 411, the inner sliding seat 41 can move horizontally along the X-axis.

[0044] For the inner sliding seat 43, its lower end is provided with an inclined guide block that matches the inclined guide rail on the inner sliding seat 41. The inclined guide rail and the inclined guide block are matched and assembled to realize the inclined transmission between them. Its front end is provided with a rear limiting block 431 that is accommodated in the vertical groove 423, and the rear limiting block 431 can move vertically up and down in the vertical groove 423.

[0045] For the aforementioned limiting transmission block 411 assembled on the inner sliding track 421 and located between the front limiting block 422 and the rear limiting block 431, the moving distance of the limiting transmission block 411 between the front limiting block 422 and the rear limiting block 431 is the horizontal limiting part 45, which is the first position interval.

[0046] In the first row, only the inner row seat 41 moves horizontally, the inner recessed row seat 43 moves vertically, and the outer row seat 42 remains stationary.

[0047] For the second movement interval, the inner moving seat 41, outer moving seat 42, and inner retracting moving seat 43 move horizontally synchronously. Specifically, the structural design principle for the synchronous horizontal movement of these three is as follows: the outer moving seat 42 has an outer sliding track 424 on its outer side away from the receiving groove; the inner side of the fixed mold core assembly 1 in the moving area 11 has a limiting guide block 12 that is assembled with the outer sliding track 424; an outer limiting block 425 is provided at the opposite position of the outer sliding track 424 relative to the front limiting block 422; when the limiting transmission block 411 abuts against the front limiting block 422, the distance between the limiting guide block 12 and the outer limiting block 425 is the second movement interval.

[0048] In summary, this involves the structural design of the first moving mold core 2 and the second moving mold core 3, as well as the structural design and assembly of the inner sliding seat 41, outer sliding seat 42, inner retracting sliding seat 43, and elastic block 44 on the fixed mold core assembly 1. The specific working principle steps are as follows:

[0049] Please read Figure 6 , Figures 8-10 As shown

[0050] (1) When the slide structure 4 is in the initial position: the inner slide seat 41, the outer slide seat 42, and the inner retractable slide seat 43 are located on the outer side away from the fixed mold core group 1, and the part above the inner retractable slide seat 43 used for injection molding undercut protrudes upward. The rear limit block 431 at the front end of the inner retractable slide seat 43 abuts against the inner slide seat 41, and there is a gap between the lower end of the rear limit block 431 and the bottom of the vertical groove 423.

[0051] (2) During the first injection molding process: the first moving mold core 2 and the fixed mold core group 1 are on the same plane and the mold is closed. The shovel base 21 at the lower end of the first moving mold core 2 enters the corresponding slide area 11 in the fixed mold core group 1 and fits with the inclined surface at the front end of the outer slide seat 42 and the inclined surface at the front end of the inner slide seat 41 to complete the mold closing. Then the first injection molding is realized by the corresponding injection channel 5 on the first moving mold core 2.

[0052] (3) During the second injection molding process: the inclined guide post 31 on the second moving mold core 3 first contacts the elastic block 44 and applies force to the elastic block 44 so that the elastic block 44 is in an inward squeezed and retracted state. When the inclined guide post 31 is completely inserted into the inclined groove 412 in the inner slide seat 41, the elastic block 44 is reset and popped out by the elastic action. At this time, the spade base 32 on the second moving mold core 3 fits with the inclined surface at the front end of the outer slide seat 42 to complete the mold closing. Then the second injection molding is realized by the corresponding injection channel 5 on the second moving mold core 3.

[0053] (4) During the demolding and mold opening process after the second injection molding is completed:

[0054] The first action between the first row positions is as follows: the inclined guide post 31 moves upward and makes hard contact with the elastic block 44, pushing the inner row position 41 to move in the inner sliding track 421. At this time, the inner row position 43 will move downward under the action of the rear limit block 431 in the vertical groove 423, while the outer row position 42 remains stationary until the limit transmission block 411 on the outer side of the inner row position 41 moves to the front limit block 422 to abut.

[0055] The second action between the two rows is as follows: As the inclined guide post 31 continues to move upward, the limiting transmission block 411 on the outer side of the inner row seat 41 moves to the front limiting block 422 and continues to move horizontally. At this time, the inner row seat 43 shrinks and the outer row seat 42 moves synchronously until the inclined guide post 31 moves out of the inclined slot 412.

[0056] (5) After the second injection is completed, during the next first injection process: the shovel base 21 on the first moving mold core 2 fits against the inclined surface at the front end of the outer sliding seat 42 and the inclined surface at the front end of the inner sliding seat 41, so that the whole slide structure 4 moves backward until it moves to the initial position.

[0057] Meanwhile, the first moving mold core 2 and the second moving mold core 3 are provided with relief grooves 6 to accommodate the vertical protrusion of the inward sliding seat 43, which are used to cooperate in completing the mold closing injection of the first shot and the mold closing injection of the second shot.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A retractable positioning structure with two movements, characterized in that: It includes a fixed mold core group and at least two moving mold core groups, namely a first moving mold core and a second moving mold core. Multiple moving mold core groups can be switched to cooperate with the fixed mold core group to form an injection cavity, realizing the mold closing injection molding process. The mold core assembly has a sliding area, and the sliding area has a movable sliding structure. The sliding structure includes an inner sliding seat, an outer sliding seat, and an inward sliding seat that are assembled together and can move synchronously along the X-axis direction; the outer sliding seat is provided with a horizontal limiting part for the inner sliding seat to move along the X-axis direction thereon, and a vertical limiting part for the inward sliding seat to move along the Z-axis direction thereon. When the first moving mold core and the fixed mold core are combined for injection molding, they come into contact with the sliding structure and move the sliding structure to its initial position; when the first moving mold core and the fixed mold core are combined for mold opening, the sliding structure is in its initial position; The inner mold seat is provided with an elastic block that extends and retracts along the Y-axis. The second moving mold core is provided with an inclined guide post that presses the elastic block inward and closes with the fixed mold core group. When the mold closing is completed, the elastic block is reset and popped out. During the mold opening of the second moving mold core and the fixed mold core group, the inclined guide post presses the elastic block to drive the sliding structure to gradually move to the first sliding position and the second sliding position.

2. The inward-retracting positioning structure with two movements according to claim 1, characterized in that: The inner sliding seat is installed inside the outer sliding seat; the inner side of the outer sliding seat is provided with an inner sliding rail, and the outer side of the inner sliding seat is provided with a limiting transmission block that moves along the X-axis and is placed on the sliding rail; the inner sliding rail is provided with a front limiting block that can abut against the limiting transmission block; The retractable travel seat is installed on the back of the inner travel seat, and the back of the inner travel seat and the retractable travel seat are connected by an oblique transmission. The outer sliding seat is provided with a vertical groove oriented in the Z-axis direction, and the inner sliding seat is provided with a rear limiting block that is accommodated in the vertical groove and can abut against the limiting transmission block.

3. The inward-retracting positioning structure with two movements according to claim 2, characterized in that: When the sliding structure is in its initial position, the limiting transmission block abuts against the rear limiting block, and there is a gap between the lower end of the rear limiting block and the bottom of the vertical groove.

4. The inward-retracting positioning structure with two movements according to claim 3, characterized in that: When the initial position limiting transmission block and the rear limiting block are in contact, the distance between the limiting transmission block and the front limiting block is the horizontal limiting part; the gap between the lower end of the limiting block and the bottom of the vertical groove is the vertical limiting part, and the parallel position structure is in the first row position.

5. The inward-retracting positioning structure with two movements according to claim 1, characterized in that: An outer sliding track is provided on the outer side of the outer slide seat. A limiting guide block is provided on the inner side of the fixed mold core group in the slide area to cooperate with the outer sliding track. An outer limiting block is provided at the opposite position of the outer sliding track relative to the front limiting block. When the limiting transmission block abuts against the front limiting block, the distance between the limiting guide block and the outer limiting block is the second slide interval.

6. The inward-retracting positioning structure with two movements according to claim 1, characterized in that: The lower end of the first moving mold core is provided with a shovel base that is obliquely driven to the outer and inner moving seats.

7. The inward-retracting positioning structure with two movements according to claim 1, characterized in that: The lower end of the second moving mold core is provided with an oblique transmission to the outer and inner sliding seats. When the second moving mold core and the fixed mold core assembly are closed, the oblique guide post and the elastic block are in an arc-shaped contact and extrusion state. When the second moving mold core and the fixed mold core assembly are closed, the second oblique guide post and the elastic block are in a hard contact and pushing state.

8. The inward-retracting positioning structure with two movements according to claim 1, characterized in that: The inner row seat is provided with an assembly elastic block and an inclined slot for accommodating the inclined guide post. The elastic block is assembled inside the inner row seat in the inclined slot. The elastic block includes a block with a slot on the back, and a spring is provided at the slot of the block to connect with the side of the inner seat.

9. The inward-shrinking positioning structure with two movements according to claim 1, characterized in that: The first and second moving mold cores are provided with injection channels that connect to the outside world and the injection cavity formed when the mold is closed.

10. The inward-retracting positioning structure with two movements according to claim 1, characterized in that: The first and second moving mold cores are provided with clearance grooves to accommodate the vertical protrusion of the retractable sliding seat.

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