Injection mold for thin-wall cylindrical products

Abstract

The utility model discloses an injection mold for thin-walled cylindrical products, which comprises an upper module, a lower module, a core-pulling mechanism and a limiting ejection mechanism, the lower module comprises a first push plate and a second push plate, and the first push plate is driven by the ejection mechanism to perform ejection displacement; the limiting ejection mechanism comprises an elastic block, a push plate clamping block and a lower die guide block, and the elastic block is mounted in a receding groove of the second push plate through a spring; the push plate clamping block is fixedly connected with the first push plate and abuts against the lower portion of the elastic block, the first push plate which conducts ejection displacement drives the second push plate to conduct ejection displacement synchronously through the elastic block, and first-stage ejection operation is completed; the push plate clamping block is fixed to the lower die set, the push plate clamping block abuts against the elastic block, the elastic block is made to retract into the receding groove so as to clamp the second push plate, the first push plate is driven by the ejection mechanism to continue to conduct ejection displacement, second-stage ejection operation is completed, and therefore the situation that the push plates are stuck is effectively avoided, and the technical problem existing in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold field especially a kind of injection mold of thin-walled cylindrical product. BACKGROUND

[0002] As Figure 1 The product A shown in the drawing is cylindrical structure applied to office supplies, which has the structural characteristics of thin wall thickness, has the practical problems of thin glue position and no ejection position, and cannot be effectively ejected by thimble. If push plate ejection is used, it needs to be fitted on the star, and there is a large holding force. Combined with the product structure characteristics and the problem of large holding force, it will cause the product to be easily stuck to the push plate during push plate ejection, resulting in automatic production, affecting product processing efficiency, and increasing processing cost.

[0003] In summary, how to eject the product as Figure 1 shown in the drawing is one of the technical problems that need to be solved by the technical personnel in the field. INVENTION CONTENTS

[0004] In order to solve the technical problems existing in the prior art, the purpose of the utility model is to provide an injection mold with elastic inclined ejection.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] An injection mold for thin-walled cylindrical products includes an upper mold set, a lower mold set, a core-pulling mechanism and a limiting ejection mechanism, wherein:

[0007] The lower mold set includes a first push plate and a second push plate, and the first push plate is driven by the ejection mechanism to perform ejection displacement;

[0008] The limiting ejection mechanism includes a spring block, a push plate clamping block and a lower mold guide block, and the spring block is installed in the second push plate through the spring;

[0009] The push plate clamping block is fixedly connected with the first push plate and abuts against the spring block below, and the first push plate driven by the spring block drives the second push plate to perform synchronous ejection displacement, completing the first stage ejection operation;

[0010] The push plate clamping block is fixed to the lower mold set, and the push plate clamping block abuts against the spring block, so that the spring block is retracted in the clearance slot to clamp the second push plate, and the first push plate is driven by the ejection mechanism to continue ejection displacement, completing the second stage ejection operation.

[0011] Further preferably, the lower mold set includes a first push plate, an ejection mechanism and a lower mold plate, wherein:

[0012] The ejection mechanism comprises an ejection plate group and an ejector rod, the ejector rod is fixedly connected with the ejection plate group, and the ejector rod penetrates through the lower die plate and abuts against the first push plate;

[0013] The first push plate is arranged close to the lower die plate and can be driven by the ejector rod to move out of the lower die plate.

[0014] Further preferably, the lower die guide block is fixedly connected with the lower die plate.

[0015] The side surface of the lower die guide block abutting against the elastic block is a slope surface, so that the elastic block is gradually pushed into the gap for releasing the driving force of the second push plate and clamping the second push plate with the movement of the second push plate.

[0016] Further preferably, the push plate clamping block has a protrusion, the protrusion extends below the elastic block and abuts against the elastic block, so as to drive the second push plate to move out of the lower die plate synchronously with the first push plate.

[0017] Further preferably, the push plate clamping block has a notch, the lower die guide block extends out of the notch to abut against the elastic block.

[0018] Further preferably, the lower die guide block is in an L shape, one segment of the lower die guide block is fixedly connected with the lower die plate of the lower die group, and the other segment is provided with a limiting protrusion at the end, the limiting protrusion abuts against the elastic block.

[0019] Further preferably, the lower die group further comprises core pulling mechanisms, the core pulling mechanisms comprise symmetrically distributed first and second core pulling mechanisms.

[0020] The upper die plate of the upper die group drives the first and second core pulling mechanisms to move out of the core, so as to complete the core pulling operation.

[0021] Compared with the background art, the technical scheme has the following advantages:

[0022] The limiting ejection mechanism is used for controlling the first push plate and the second push plate to complete the two-stage ejection operation in sequence, so that the product is first released from the clamping force and then ejected, thereby effectively avoiding the situation that the push plate is stuck, solving the technical problems in the prior art, achieving the purpose of automatic processing of the product, improving the processing efficiency and reducing the processing cost. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a product structure perspective view;

[0024] Figure 2 is a structure section of the injection mold of the thin-walled cylindrical product in the embodiment of the utility model Figure 1 ;

[0025] Figure 3 is the three-dimensional schematic view of the lower die set structure with the secondary ejection mechanism in the embodiment of the utility model;

[0026] Figure 4 is the structure sectional view of the injection mold with the elastic inclined ejection mechanism in the embodiment of the utility model Figure 2 .

[0027] Figure 5 is the structure three-dimensional schematic view of the push plate clamping block in the embodiment of the utility model;

[0028] Figure 6 is the structure sectional view of the injection mold with the elastic inclined ejection mechanism in the embodiment of the utility model Figure 3 .

[0029] The mark of the above specification drawing is as follows:

[0030] 110, top plate; 120, upper die plate; 140, first sliding block; 141, forming sliding block; 150, second sliding block;

[0031] 210, first push plate; 211, push plate clamping block; 212, notch; 220, lower die plate; 221, lower die guide block; 230, ejection mechanism; 231, ejector pin; 240, bottom plate; 250, square iron;

[0032] 310, linkage push plate;

[0033] 410, elastic block;

[0034] 510, core; 520, upper die core; 530, second push plate;

[0035] A, product. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the utility model is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0037] It needs to be explained in the utility model that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are all based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the utility model and simplify the description, and are not used to indicate or imply that the devices or elements of the utility model must have a specific orientation, so it cannot be understood as a limitation on the utility model.

[0038] EMBODIMENT

[0039] As Figure 1The cylindrical structure product such as product A shown has the structural characteristics of thin wall thickness, so that the glue position is thin, there is no ejection position, the ejector pin 231 cannot be used for ejection, and if the push plate is used for ejection, the problem of sticking to the push plate directly leads to automatic production.

[0040] In combination Figures 2 to 6 The utility model discloses a kind of injection moulds of thin-walled cylindrical product, it controls first push plate 210 and second push plate 530 according to sequence ejection operation using limiting ejection mechanism 230, to effectively avoid the situation of sticking push plate, solve the technical problem existing for processing as Figure 1 Product A.

[0041] As shown in Figure 2 And Figure 4 A kind of injection mould of thin-walled cylindrical product, it includes upper die group, lower die group, core 510, core-pulling mechanism and limiting ejection mechanism 230, the upper die group and lower die group are adjacently arranged, the core 510, core-pulling mechanism and limiting ejection mechanism 230 are all assembled in lower die group, realize product A ejection stripping.

[0042] As shown in Figure 2 And Figure 4 The upper die group includes top plate 110 and upper die plate 120, the top plate 110 is fixedly connected with the upper die plate 120, the upper die group is provided with upper die accommodating groove towards lower die group, and upper die core 520 is assembled in the upper die accommodating groove.Specifically: glue injection nozzle is installed on the upper die group, the glue injection nozzle penetrates top plate 110, upper die plate 120 and upper die core 520, so as to realize injecting glue solution in mold core.It needs to be noted that: the upper die core 520 is plate body, and it is fixed at upper die core 520 accommodating groove bottom surface, when upper die group and lower die group relatively separate and carry out opening mould movement, the upper die core 520 and upper die group carry out opening mould movement synchronously.

[0043] As shown in Figure 2 , Figure 3 And Figure 4As shown, the lower die set comprises a bottom plate 240, square iron 250, ejection mechanism 230, lower die plate 220, first push plate 210 and the limiting ejection mechanism 230. Two square irons 250 are symmetrically distributed and are fixed on the bottom plate 240, the lower die plate 220 is fixedly connected with the two square irons 250, the bottom plate 240, the two square irons 250 and the lower die plate 220 form a ejection cavity suitable for assembling the ejection mechanism 230; the first push plate 210 is a plate body matched with the lower die plate 220, and is arranged close to the lower die plate 220, that is, the first push plate 210 is clamped between the upper die plate 120 and the lower die plate 220, and the first push plate 210 is not fixedly connected with the lower die plate 220; the ejection mechanism 230 comprises an ejection plate group, a ejector rod and a ejector pin 231, the ejector rod and the ejector pin 231 are fixed on the ejection plate group, the ejection plate group is arranged in the ejection cavity, and the ejection plate group is displaced by the ejection device from the lower die plate 220 to the upper die plate 120 direction. It should be noted that the top column penetrates the lower die plate 220 and abuts against the first push plate 210, that is, the top column can drive the first push plate 210 to perform ejection work; in addition, the core 510 penetrates the first push plate 210 and is connected with the lower die plate 220, that is, when the first push plate 210 is driven to perform ejection work, it is not driven, and this design is to adapt to the product A with a cylindrical structure.

[0044] As shown in Figure 2 , Figure 3 and Figure 4 , the core 510 is a columnar body, the outer side of which is sleeved with a second push plate 530, the second push plate 530 is a block body, a through hole is formed in the second push plate 530 to allow the core 510 to pass through the second push plate 530, and a linkage push plate 310 is further arranged outside the second push plate 530, the linkage push plate 310 is an annular block body, the through hole in the middle part of which is matched with the second push plate 530 and is sleeved outside the second push plate 530; it should be noted that the first push plate 210 has a linkage protrusion, the linkage protrusion abuts below the linkage push plate 310, when the first push plate 210 is driven by the ejection mechanism 230 to perform ejection work, the linkage push plate 310 synchronously performs ejection work with the first push plate 210, and the first push plate 210 synchronously performs ejection work with the second push plate 530 through the limiting ejection mechanism 230, thereby completing the first-stage product A ejection.

[0045] As shown in Figure 4 and Figure 6As shown, the first push plate 210 is further provided with a core pulling mechanism, which includes a first core pulling mechanism and a second core pulling mechanism, the first core pulling mechanism and the second core pulling mechanism are symmetrically distributed, the first core pulling mechanism includes a first sliding block 140 and a first core pulling driving rod, the first driving rod is connected with the upper die plate 120 and is driven by the mold opening movement to drive the first sliding block 140 to perform core pulling movement; the second core pulling mechanism includes a second sliding block 150 and a second core pulling driving rod, the second driving rod is connected with the upper die plate 120 and is driven by the mold opening movement to drive the second sliding block 150 to perform core pulling displacement. Therefore, the mold opening movement of the upper and lower mold sets synchronously drives the first sliding block 140 and the second sliding block 150 to simultaneously perform core pulling displacement. It should be noted that: the first sliding block 140 is locked with a shaped sliding block 141, the shaped sliding block 141 and the second sliding block 150, the core 510 and the upper core 520 enclose a finished product forming cavity adapted to the product A; the shaped sliding block 141 is located above the linkage push plate 310 in the mold closing state.

[0046] In addition, the aforementioned ejector pin 231 penetrates the lower die plate, the first push plate and extends into the second push plate, and abuts against two adjacent finished product forming cavities, so as to demold the material belt between the two adjacent finished product forming cavities, thereby assisting the product demolding and enabling the product to be reused as soon as possible to complete efficient processing and forming operation.

[0047] It should be noted that: Figure 4 and Figure 6 As shown, the second push plate 530 and the first push plate 210 are provided with a limiting ejection mechanism 230, and the two-stage ejection operation is completed by the limiting ejection mechanism 230, specifically: the two-stage ejection operation includes synchronous ejection and independent ejection of the first push plate 210, in combination with the above structure description, the ejection mechanism 230 drives the first push plate 210 and the linkage push plate 310 to be synchronously ejected, the second push plate 530 is linked with the first push plate 210 by the limiting ejection mechanism 230, and the first and second push plates are synchronously ejected to complete the first-stage synchronous ejection operation. The purpose of the first-stage synchronous ejection operation is to unload, that is, to release the holding force between the core 510 and the product A.

[0048] As shown, Figure 4 and Figure 6As shown, the limiting ejection mechanism 230 includes a spring block 410, a push plate locking block 211, and a lower mold guide block 221. The second push plate 530 has a clearance groove, which is positioned corresponding to the first push plate 210. The spring block 410 is spring-loaded into the clearance groove. When the spring block 410 is pressed, the spring is compressed simultaneously, compressing the spring block 410 and the spring into the clearance groove; conversely, the spring block 410 is pushed out of the clearance groove by the spring's restoring force. To facilitate smooth operation, a ramp is provided at the end of the spring block 410 away from the spring for ejection engagement. Specifically, there are two clearance grooves, symmetrically distributed, and consequently, there are also two spring blocks 410, symmetrically distributed, thereby effectively controlling the first push plate 210. The push plate locking block 211 is fixedly connected to the first push block. The push plate locking block 211 has a protrusion on one side facing the spring block 410. This protrusion is located below the spring block 410. In other words, when the first push plate 210 is driven to push out (Note: such as...), Figure 4 As shown, at this time, the spring block 410 is not pressed down, and the spring block 410 still protrudes outside the relief groove. The protrusion abuts against the spring block 410, and by driving the spring block 410, the second push plate 530 and the first push plate 210 are pushed out synchronously, thereby completing the first stage of the synchronous ejection operation. The overall shape of the lower mold guide block 221 is L-shaped, as shown in the figure. Figure 6 As shown, a section of the lower mold guide block 221 along the X-axis is fixedly connected to the lower mold plate 220, and a section along the Y-axis is a limiting section. A limiting protrusion is provided at the end of the limiting section facing the spring block 410. The side of the limiting protrusion that abuts against the spring block 410 is an inclined surface. The inclined surface of the limiting protrusion matches the inclined surface of the spring block 410. It should be noted that the inclined surface of the spring block 410 is an inclined surface that slopes downward from the upper mold assembly to the lower mold assembly. When the second push plate 530 is driven to perform ejection displacement, the spring block 410 is driven by the second push block to perform synchronous ejection displacement. The moving spring block 410 is abutted by the limiting protrusion of the lower mold guide block 221 and gradually guided into the relief groove. After the spring block 410 is completely separated from the lower mold guide block 221, the second push plate 530 has no ejection driving force, while the first push plate 210 performs ejection operation independently, thereby starting the second stage of ejection operation.

[0049] More detailed: such as Figure 5As shown, the push plate block 211 is a rectangular block, which is locked with the first push block by screws, so as to move synchronously with the first push block; the push plate block 211 is provided with an inner recessed notch 212, and the push plate block 211 on both sides of the notch 212 forms a push arm, which is provided with the above-mentioned protrusion, and the protrusion is used to drive the second push plate 530 to synchronously perform the ejection displacement. It should be noted that the lower mold guide block 221 is installed corresponding to the notch 212, the limiting section of the lower mold guide block 221 extends from the notch 212 and abuts with the elastic block 410, so as to control the ejection displacement or clamping of the second push plate 530.

[0050] As shown in Figure 4 and Figure 6 shown, the first push plate 210 and the second push plate 530 are controlled by the limiting ejection mechanism 230, so as to realize two-stage ejection operation, and the specific operation is as follows:

[0051] First-stage ejection operation:

[0052] Synchronous ejection, the first push plate 210 is driven by the ejection mechanism 230, the first push plate 210 is linked with the second push plate 530 through the push plate protrusion and the elastic block 410, so as to realize synchronous ejection operation of the first push plate 210 and the second push plate 530, at this time, the core 510 is in a relatively static state, and the purpose of the ejection operation of the first push plate 210 and the second push plate 530 is to relatively separate the product A and the core 510, so as to release the holding force of the product A;

[0053] Second-stage ejection operation:

[0054] Independent ejection of the first push plate 210, the elastic block 410 is abutted into the position slot by the lower mold guide block 221, at this time, the second push plate 530 is separated from the driven elastic block 410, the second push plate 530 has no driving force for ejection displacement, at this time, the first push plate 210 and the linkage push plate 310 continue to perform the ejection operation, so as to completely separate the product A from the core 510, and achieve the purpose of demolding of the product A.

[0055] Combined Figures 1 to 6 with the structure shown, and the structure of the injection mold of the thin-walled cylindrical product, the product A ejection action and principle are as follows:

[0056] Mold opening

[0057] The upper mold set and the lower mold set are relatively separated, the upper mold core 520 is driven to move away from the core pulling mechanism, so as to realize mold opening;

[0058] Core pulling

[0059] The first core pulling mechanism and the second core pulling mechanism perform core pulling operation; specifically, the first slider 140 and the second slider 150 are driven by the upper die plate 120 to perform core pulling displacement in a square shape, and the mold core pulling operation is completed;

[0060] Ejection demolding

[0061] The first push plate 210 and the second push plate 530 are controlled by the limiting ejection mechanism 230, so as to realize two-stage ejection operation, and the specific process is as follows:

[0062] First-stage ejection operation:

[0063] Synchronous ejection, the first push plate 210 is driven by the ejection mechanism 230, the first push plate 210 is linked with the second push plate 530 through the push plate protrusion and the elastic block 410, synchronous ejection of the first push plate 210 and the second push plate 530 is realized, at this time, the core 510 is in a relatively static state, the purpose of the ejection operation of the first push plate 210 and the second push plate 530 is to separate the product A from the core 510, so as to release the holding force of the product A;

[0064] Second-stage ejection operation:

[0065] First push plate 210 independent ejection, the elastic block 410 is pushed into the position slot by the lower die guide block 221, at this time, the second push plate 530 is separated from the driven ejection elastic block 410, the second push plate 530 has no driving force for ejection displacement, at this time, the first push plate 210 continues to perform ejection operation, so as to completely separate the product A from the core 510, and the purpose of demolding of the product A is achieved.

[0066] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. Injection mold for thin-walled tubular-like products, characterized in that: It includes upper die set, lower die set, core pulling mechanism and limiting ejection mechanism, wherein: The lower die set includes first push plate and second push plate, the first push plate is driven by the ejection mechanism to perform ejection displacement; The limiting ejection mechanism includes elastic block, push plate clamping block and lower die guide block, the elastic block is installed in the second push plate by spring in the accommodation slot; The push plate clamping block is fixedly connected with the first push plate and abuts against the elastic block below, the first push plate driven by the elastic block drives the second push plate to perform synchronous ejection displacement, to complete the first stage ejection operation; The push plate clamping block is fixed to the lower die set, the push plate clamping block abuts against the elastic block, so that the elastic block is retracted in the accommodation slot to clamp the second push plate, the first push plate is driven by the ejection mechanism to continue ejection displacement, to complete the second stage ejection operation.

2. Injection mold for thin-walled tubular product-like articles according to claim 1, characterized in that: The lower die set includes first push plate, ejection mechanism and lower die plate, wherein: The ejection mechanism includes ejection plate set and ejector rod, the ejector rod is fixedly connected with the ejection plate set, the ejector rod passes through the lower die plate and abuts against the first push plate; The first push plate is arranged close to the lower die plate and can be driven by the ejector rod to perform ejection displacement away from the lower die plate.

3. Injection mold for thin-walled tubular product-like articles according to claim 2, characterized in that: The lower die guide block is fixedly connected with the lower die plate; The side surface of the lower die guide block abutting against the elastic block is inclined surface, to gradually abut the elastic block into the accommodation slot with the ejection displacement of the second push plate, to release the ejection power of the second push plate and clamp the second push plate.

4. The injection mold for thin-walled tubular product-like articles according to claim 1, characterized in that: The push plate clamping block has protrusion, the protrusion extends into the elastic block below and abuts against the elastic block, to drive the second push plate and the first push plate to perform synchronous ejection displacement.

5. Injection mold for thin-walled tubular product-like articles according to claim 4, characterized in that: The push plate clamping block has notch, the lower die guide block extends from the notch to abut against the elastic block.

6. Injection mould for thin-walled tubular product-like articles according to claim 3 or 5, characterized in that: The lower die guide block is L-shaped, one section of the lower die guide block is fixedly connected with the lower die plate of the lower die set, and the other section is provided with limiting protrusion at the end, the limiting protrusion abuts against the elastic block.

7. The injection mold for thin-walled tubular product-like articles according to claim 1, characterized in that: The lower die set further includes core pulling mechanism, the core pulling mechanism includes symmetrically distributed first core pulling mechanism and second core pulling mechanism; The upper die plate of the upper die set drives the first and second core pulling mechanisms to perform core pulling displacement, to complete the core pulling operation.

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