Long-distance core-pulling secondary demolding mechanism for injection fluid director

Abstract

The long-distance core-pulling secondary demolding mechanism comprises a lower mold base and a pin base, a lower mold core and a core-pulling air cylinder are fixedly connected to the lower mold base, a first sliding block is slidably connected to the position, between the core-pulling air cylinder and the lower mold core, in the lower mold base, and a first receding groove and a second receding groove are formed in the middle of the first sliding block; a receding groove is formed in one side of the first sliding block, a piston rod of the core pulling air cylinder is located in the receding groove, a receding gap is reserved between the piston rod of the core pulling air cylinder and the receding groove, the other side of the first sliding block is fixedly connected with an inner wall forming insert and an inner hole forming rod, and an inclined guide column and a straight guide column are fixedly connected to the pin seat. A fixed sliding seat is connected into the second receding groove in a sliding mode, and the fixed sliding seat and the inner wall forming insert are each connected with an inverted buckle forming insert in a sliding mode. The injection fluid director has the beneficial effects that back-off receding and long-distance core pulling actions of the injection fluid director can be achieved without using a long angle pin, the overall structure is compact, simple and practical, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of injection molds, and particularly to a long-distance core-pulling and secondary demolding mechanism for an injection flow guide. Background Art

[0002] Medical injection molding is a precision injection molding technology specifically used for the production of medical supplies. It involves injecting molten plastic into a mold, melting plastic resin, and molding the molten material into a specific shape of a medical device. The injection flow guide is one of the components of medical injection supplies. To ensure the smooth molding of its central flow channel, a relatively long inner hole forming rod is used for molding, and there is an undercut structure in its inner hole part. After injection molding, undercut relieving and long-distance core-pulling actions are required.

[0003] Regarding the demolding and core-pulling of medical injection molded parts, there is a medical puncture sleeve injection mold with a publication number of CN215203163U, which includes: a front mold panel, a front template, a rear template, a rear mold bottom plate, and a second core-pulling mechanism. The front mold panel is fixedly connected to the front template, and the rear template is fixedly connected to the rear mold bottom plate; the injection mold further includes a counter for counting and a precise positioning component for precisely positioning the front template and the rear template; the front template and the rear template are respectively provided with a front mold guide post and a rear mold guide sleeve for mutual cooperation. A cavity is formed in the middle of the lower end of the front template and a front mold core is fixed therein. A plurality of injection runner channels are provided in the front mold core, and core pins for shelling are respectively provided at the lower ends of the injection runner channels; a cavity is formed in the upper end of the rear template and a rear mold core is fixed at the lower end of its cavity, and the second core-pulling mechanism is arranged at the front and rear of the cavity. The second core-pulling mechanism includes an inclined guide post assembly, a slide block, a cavity plate, a slide rail, and a limit seat. The slide rail is fixed on the rear template, the slide block is slidably matched with the slide rail, the front end of the slide block is fixed with the cavity plate, and the rear end is provided with the inclined guide post assembly for driving its forward and backward sliding. The inclined guide post assembly is fixed at the lower end of the front template, and the limit seat is used to limit the movement distance of the slide block and is arranged at the rear end of the inclined guide post assembly and fixed to the rear template; the cavity plates of the front and rear groups are pressed together with the front mold core and the rear mold core to enclose an injection cavity for the injection molding of products. The core pins are inserted into the injection cavity for the shelling molding of products; a delay block for delaying its sliding is further arranged on the slide block and fixed at the lower end of the front mold core; a corrugated cavity plate and a slide block ejector pin are also arranged in the cavity plate.

[0004] For the existing demolding and core-pulling mechanism, although it can automatically perform the core-pulling action of the sleeve, when the core-pulling distance is relatively long, it means that a longer inclined pin is required to achieve the long-distance core-pulling action. However, the excessive length of the inclined pin will increase the overall size of the mold and raise the cost. Therefore, a long-distance core-pulling and secondary demolding mechanism for an injection flow guide is needed. Summary of the Invention

[0005] The object of the present invention is to provide a secondary demolding mechanism with long-distance core pulling for an injection flow guide device, which can realize the undercut yielding and long-distance core pulling actions of the injection flow guide device without using long angled pins. The overall structure is compact, simple and practical, and the production cost is reduced.

[0006] To achieve the above object, the present invention provides the following technical solution: A secondary demolding mechanism with long-distance core pulling for an injection flow guide device, including a lower mold base and a pin seat. A lower mold core and a core pulling cylinder are fixedly connected to the lower mold base. A first slider is slidably connected between the core pulling cylinder and the lower mold core in the lower mold base. A first yielding groove and a second yielding groove are formed in the middle of the first slider. An avoidance groove is provided on one side of the first slider. The piston rod of the core pulling cylinder is located in the avoidance groove, and there is an avoidance gap between the piston rod of the core pulling cylinder and the avoidance groove. An inner wall forming insert and an inner hole forming rod are fixedly connected to the other side of the first slider. An angled guide post and a straight guide post are fixedly connected to the pin seat. The lower end of the angled guide post extends into the first yielding groove. An elastic clamping block is provided in the first yielding groove. A fixed sliding seat is slidably connected in the second yielding groove. An undercut forming insert is slidably connected to both the fixed sliding seat and the inner wall forming insert.

[0007] Further, a sliding groove is provided on the lower mold base, and the first slider is slidably connected to the sliding groove.

[0008] Further, a clamping groove is provided on one side of the angled guide post, and the clamping groove corresponds to the part of the elastic clamping block extending into the first yielding groove.

[0009] Further, a stop block is fixedly connected to the lower mold base beside the fixed sliding seat, and the upper end of the stop block extends into the second yielding groove.

[0010] Further, a limiting hole is formed in the fixed sliding seat, and the limiting hole is slidably connected to the straight guide post.

[0011] Further, the undercut forming insert is slidably connected to the fixed sliding seat left and right, and an inclined groove is provided on the inner wall forming insert, and the undercut forming insert is slidably connected to the inclined groove.

[0012] The beneficial effect of the present invention is that the undercut yielding and long-distance core pulling actions of the injection flow guide device can be realized without using long angled pins. The overall structure is compact, simple and practical, and the production cost is reduced. Description of the Drawings

[0013] Figure 1 Is an isometric schematic view of the present invention.

[0014] Figure 2 Is a structural schematic view of the first slider of the present invention.

[0015] Figure 3Schematic diagram of the first perspective at the second slider of the present invention.

[0016] Figure 4 Schematic diagram of the second perspective at the second slider of the present invention.

[0017] Figure 5 Schematic diagram of the undercut relief of the present invention.

[0018] Figure 6 Schematic diagram of an injection flow guide.

[0019] In the figure: 1. Lower mold base; 101. Lower mold core; 2. Pin seat; 201. Angled guide pin; 2011. Card slot; 202. Straight guide pin; 3. Core-pulling cylinder; 4. First slider; 401. First relief groove; 402. Second relief groove; 403. Avoidance groove; 404. Inner wall forming insert; 405. Inner hole forming rod; 406. Elastic block; 5. Fixed slider seat; 501. Undercut forming insert; 6. Stop block. Detailed implementation mode

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further elaborates on the present invention in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] Refer to Figures 1-6 As shown in a long-distance core-pulling and secondary demolding mechanism of an injection flow guide, which includes a lower mold base 1 and a pin seat 2. A lower mold core 101 and a core-pulling cylinder 3 are fixedly connected to the lower mold base 1. A first slider 4 is slidably connected between the core-pulling cylinder 3 and the lower mold core 101 in the lower mold base 1. A first relief groove 401 and a second relief groove 402 are formed in the middle of the first slider 4. An avoidance groove 403 is provided on one side of the first slider 4. The piston rod of the core-pulling cylinder 3 is located in the avoidance groove 403, and there is an avoidance gap between the piston rod of the core-pulling cylinder 3 and the avoidance groove 403. An inner wall forming insert 404 and an inner hole forming rod 405 are fixedly connected to the other side of the first slider 4. An angled guide pin 201 and a straight guide pin 202 are fixedly connected to the pin seat 2. The lower end of the angled guide pin 201 extends into the first relief groove 401. An elastic block 406 is provided in the first relief groove 401. A fixed slider seat 5 is slidably connected in the second relief groove 402. An undercut forming insert 501 is slidably connected to both the fixed slider seat 5 and the inner wall forming insert 404.

[0022] A chute is provided on the lower mold base 1. The first slider 4 is slidably connected to the chute, and the chute can guide the core-pulling action of the first slider 4.

[0023] A slot 2011 is provided on one side of the inclined guide column 201 , and the slot 2011 is arranged corresponding to the portion of the elastic block 406 extending into the first clearance groove 401 . The slot 2011 cooperates with the elastic block 406 to drive the first slider 4 to perform core pulling sliding and mold closing actions.

[0024] A stopper 6 is fixedly connected to the lower die base 1 beside the fixed slide 5 , and the upper end of the stopper 6 extends into the second clearance groove 402 . The stopper 502 can block and limit the fixed slide 5 .

[0025] A limiting hole is formed on the fixed slide 5 , and the limiting hole is slidably connected to the straight guide post 202 . When the straight guide post 202 is located in the limiting hole, the fixed slide 5 remains stationary relative to the lower die base 1 .

[0026] The undercut molding insert 501 is slidably connected to the fixed slide seat 5 left and right, and an inclined groove is provided on the inner wall molding insert 404. When the undercutting and yielding action is performed, the two undercut molding inserts 501 will approach each other, and the undercut molding inserts 501 are slidably connected to the inclined groove.

[0027] The working principle of the present invention is as follows: when in use, the pin seat 2 is fixed on the upper die seat. When the mold opening action is performed, the upper die seat first slides to the side away from the lower die seat 1 to open the mold. Under the cooperation of the inclined guide column 201 and the elastic block 406, the first slider 4 first slides to the side away from the lower die seat 1. At this time, the fixed slide seat 5 remains motionless relative to the lower die seat 1 under the limit of the straight guide column 202. During the sliding process of the first slider 4, the avoidance gap between the piston rod of the core-pulling cylinder 3 and the first slider 4 is gradually reduced until it is zero (the core-pulling cylinder 3 is in the mold closing state). The piston rod of cylinder 3 is located at one end of the avoidance groove 403 away from the lower mold base 1). At the fixed slide seat 5, the two undercut molding inserts 501 will approach each other under the sliding of the first slider 4 and the inner wall molding insert 404 to achieve an undercut avoidance action. After completing the undercut avoidance action, the piston rod of the core-pulling cylinder 3 is retracted to continue to pull the first slider 4 to slide to the side away from the lower mold base 1 to completely pull out the inner hole molding rod 405. At this point, the inner wall molding insert 404, the inner hole molding rod 405, and the undercut molding insert 501 are completely separated from the finished injection guide device to complete demolding.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The above embodiments are used to further illustrate the present invention, but do not limit the present invention to these specific embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be understood to be within the protection scope of the present invention.

Claims

1. A secondary demolding mechanism with long-distance core pulling for an injection flow guide device, characterized in that: It includes a lower die base (1) and a pin seat (2). A lower die core (101) and a core-pulling cylinder (3) are fixedly connected to the lower die base (1). A first slider (4) is slidably connected between the core-pulling cylinder (3) and the lower die core (101) inside the lower die base (1). A first relief groove (401) and a second relief groove (402) are formed in the middle of the first slider (4). An avoidance groove (403) is provided on one side of the first slider (4). The piston rod of the core-pulling cylinder (3) is located in the avoidance groove (403), and there is an avoidance gap between the piston rod of the core-pulling cylinder (3) and the avoidance groove (403). An inner wall forming insert (404) and an inner hole forming rod (405) are fixedly connected to the other side of the first slider (4). An inclined guide post (201) and a straight guide post (202) are fixedly connected to the pin seat (2). The lower end of the inclined guide post (201) extends into the first relief groove (401). An elastic clamping block (406) is provided in the first relief groove (401). A fixed slider (5) is slidably connected in the second relief groove (402). An undercut forming insert (501) is slidably connected to both the fixed slider (5) and the inner wall forming insert (404). A clamping groove (2011) is provided on one side of the inclined guide post (201), and the clamping groove (2011) corresponds to the part of the elastic clamping block (406) extending into the first relief groove (401).

2. The secondary demolding mechanism with long-distance core pulling for an injection flow guide device according to claim 1, characterized in that: A chute is provided on the lower die base (1), and the first slider (4) is slidably connected to the chute.

3. The secondary demolding mechanism for long-distance core pulling of an injection flow guide device according to claim 1, characterized in that: A stop block (6) is fixedly connected to the lower die base (1) beside the fixed slider (5), and the upper end of the stop block (6) extends into the second relief groove (402).

4. The secondary demolding mechanism with long-distance core pulling for an injection flow guide device according to claim 1, characterized in that: A limit hole is formed in the fixed slider (5), and the limit hole is slidably connected to the straight guide post (202).

5. The secondary demolding mechanism with long-distance core pulling for an injection flow guide device according to claim 1, characterized in that: The undercut forming insert (501) is slidably connected to the fixed slider (5) left and right, and an inclined groove is provided on the inner wall forming insert (404), and the undercut forming insert (501) is slidably connected to the inclined groove.

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