Auxiliary device for injection molding machine

Abstract

The invention relates to an auxiliary device for injection molding machines applied in the field of injection molding machines, comprising a movable mold and a fixed mold both of which are provided with a filling cavity inside, the fixed mold is arranged on one side of the movable mold, a transition frame is fixedly connected to the surface of one side of the fixed mold, a servo drive motor is connected to one side surface of the transition frame, and a servo rotating motor is connected to the surface of the movable mold away from the fixed mold; a clamping mechanism is arranged on one side of the movable mold, the clamping mechanism comprises symmetrically arranged small electric extension rods, other support rods are connected to support rings, the interior of the fixed mold is rotatably connected to a push plate, a small electric extension sleeve rod is fixed inside a circular recess, and an output end of the small electric extension sleeve rod is connected to a swing rod, which has a grinding effect through rotation in opposite directions, thereby reducing tearing damage to plastic products when they leave the filling cavity in the mold, and at the same time, with the help of the clamping mechanism, it can be ensured that the plastic products will not fall and be damaged when they leave the filling cavity in the fixed mold, thereby effectively protecting the safety of the plastic products during the demoulding process.

Description

Technical Field

[0001] The invention relates to an auxiliary device for an injection molding machine, in particular to an auxiliary device for an injection molding machine applied in the field of injection molding machines. Background Art

[0002] Injection molding is a process of heating plastic or other materials and then injecting them into a mold to achieve large-scale production of various complex shapes. A complete injection molding process includes: mold closing - injection - pressure holding - material storage - ejection - cooling - mold opening - ejection. During the injection molding process, an injection molding machine is required. During the operation of the injection molding machine, a stripping device is required to assist in the separation of the mold and the molding material.

[0003] The specification of Chinese invention patent CN202310996369.1 discloses an auxiliary demoulding device for an injection molding machine, and the steps of using the device are as follows: (1) When the movable mold and the fixed mold of the mold of the injection molding machine are separated, if the infrared receiver receives a signal from the infrared transmitter, it is determined that the plastic product is on the movable mold, otherwise it is determined that the plastic product is on the fixed mold; (2) According to the location of the plastic product, the angle of the rotating plate is adjusted by the electric angle adjustment component so that the vacuum suction cup faces the side where the plastic product is located; (3) First, the lifting seat is controlled to move downward by the second cylinder so that the vacuum adsorption mechanism moves downward and approaches the plastic product in height; then, the sliding frame is driven to move by the first cylinder so that the vacuum suction cup contacts the plastic product to realize vacuum adsorption; then, the first cylinder is reset to make the plastic product separate from the movable mold or the fixed mold; finally, the sliding frame is driven to move by the power mechanism to drive the vacuum adsorption mechanism to separate from the injection molding machine.

[0004] When working, the above-mentioned equipment first determines whether the plastic product is in the movable mold or the fixed mold after demolding, and then uses the vacuum suction cup to complete the demolding process. However, in the actual operation process, the plastic product will inevitably be adhered to the inner wall of the movable mold or the fixed mold. The subsequent pulling and detachment after the vacuum suction cup is adsorbed will cause the plastic product to tear off the inner wall of the mold, which is easy to damage the surface of the plastic product. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to reduce the tearing effect between the plastic product and the mold during demoulding to ensure the integrity of the surface of the plastic product.

[0006] In order to solve the above problems, the present invention provides an auxiliary device for an injection molding machine, comprising a movable mold and a fixed mold both of which have filling cavities inside, the fixed mold is arranged on one side of the movable mold, a transition frame is fixedly connected to a surface of the fixed mold on a side away from the movable mold, a servo drive motor is connected to a surface of the transition frame on a side away from the fixed mold, and a servo rotary motor is connected to a surface of the movable mold on a side away from the fixed mold;

[0007] A clamping mechanism is arranged on one side of the movable mold close to the fixed mold, and the clamping mechanism includes symmetrically arranged small electric extension rods. A plurality of support rods are fixedly connected to the surface of one side of the movable mold close to the fixed mold, wherein the bottoms of two support rods are connected to the fixed ends of the small electric extension rods, and the tail ends of the other support rods are fixedly connected to support rings, and a clamping arc ring is arranged above the support ring, and the tail end of the clamping arc ring is connected to a convex block, and the top surface of the convex block is connected to the output end of the small electric extension rod, and a ring-shaped fitting groove is provided on the surface of one side of the fixed mold close to the movable mold, and the surface of the support ring close to the filling cavity is in contact with the inner wall of the fitting groove close to the filling cavity;

[0008] The fixed mold is internally rotatably connected to two semicircular push plates, and a circular depression is provided on the surface of one side of the fixed mold close to the transition frame. A small electric stretch sleeve is fixed inside the circular depression through a bracket, and the output end of the small electric stretch sleeve is connected to a symmetrically arranged swing rod through a hinge, and the tail end of the swing rod is movably connected to the surface of the push plate.

[0009] In the above-mentioned auxiliary device for injection molding machine, a grinding effect is achieved by rotating in opposite directions, thereby reducing the tearing damage of the plastic product when it leaves the filling cavity in the mold. At the same time, with the help of a clamping mechanism, it can be ensured that the plastic product will not fall and be damaged when leaving the filling cavity in the fixed mold, thereby effectively protecting the safety of the plastic product during the demolding process.

[0010] As a further improvement of the present application, the arc length of the clamping arc ring is smaller than the arc length of the supporting ring, the supporting ring is located outside the filling cavity and the supporting ring and the clamping arc ring are in the same plane, the surface of the protrusion is connected to the tail end of the small electric extension pole and the projection of the protrusion in the vertical direction is located outside the projection of the support ring in the vertical direction.

[0011] As a further improvement of the present application, the clamping arc ring is made of an arc-shaped memory metal strip and the center of the clamping arc ring and the support ring are the same, and an arc-shaped rubber sheet is connected to the surface of the memory metal strip close to the filling cavity.

[0012] As a further improvement of the present application, it also includes an auxiliary control system, which includes a processor, to which a drive module and a monitoring module are connected, and the drive module is signal-connected to the small electric extension rod, the servo rotating motor, the servo drive motor and the small electric extension sleeve rod, and the monitoring module includes a pressure sensor embedded in the support ring and the movable mold, and the two pressure sensors are signal-connected.

[0013] As a further improvement of the present application, the engaging groove is located on the outside of the filling cavity, the cross-sectional width of the engaging groove is not less than the sum of the projected cross-sectional widths of the support ring and the support rod in the vertical direction, and the ring diameter of the engaging groove is not less than the sum of the thicknesses of the clamping arc ring and the protrusion.

[0014] As a further improvement of the present application, the diameter of the circular depression is smaller than the diameter of the push plate, and the angle formed between the two swing rods in the initial state is smaller than the angle formed between the two swing rods after the small electric extension sleeve rod is started.

[0015] As another improvement of the present application, a connecting seat is installed at the output end of the servo rotating motor, and a strip groove is provided on the surface of the connecting seat. The inner wall of the strip groove is connected to a coupling rod through an axis rod, and the tail end of the coupling rod is fixedly connected to the surface of the movable mold. A small lifting plate connected to the drive module signal is installed on the bottom wall of the strip groove, and the top of the small lifting plate is in engagement contact with the surface of the coupling rod.

[0016] As another improvement supplement of the present application, in the initial state, the center of the coupling rod and the center of the movable mold are on the same axis, and in the initial state, there is a vertical gap between the top of the coupling rod and the top wall of the strip groove.

[0017] To summarize, the present application is equipped with a servo drive motor and a servo rotary motor. Before assisting the injection molding machine in demolding, the surface of the plastic product and the inner wall of the fixed mold and the movable mold are first polished by rotating in the opposite direction to facilitate the smooth removal of the plastic product. Then, the movable mold is driven to move by an external mobile platform, and the plastic product is alarmed by a clamping mechanism to enhance the separation effect while avoiding falling damage during the separation process. Then, with the help of a coupling rod and a small lifting plate, the plastic product that has completely separated from the fixed mold can be smoothly separated from the movable mold under the action of its own weight, avoiding the use of other mechanical equipment and controlling the cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the first and second implementation modes of the present application;

[0019] Figure 2 This is a schematic diagram of the installation of the servo drive motor, transition frame and small electric extension sleeve rod of the first and second embodiments of the present application;

[0020] Figure 3 For this application Figure 2 A is an enlarged schematic diagram;

[0021] Figure 4 This is a schematic diagram of the internal structure of the fixed mold in the first and second implementation modes of the present application;

[0022] Figure 5 It is a cross-sectional view of the clamping mechanism of the first and second embodiments of the present application;

[0023] Figure 6 Schematic diagram of the servo drive motor and the servo rotary motor rotating in opposite directions according to the first and second embodiments of the present application;

[0024] Figure 7 It is a schematic diagram of the working state of the small electric extension sleeve and the clamping mechanism of the first and second embodiments of the present application;

[0025] Figure 8 This is a diagram of the installation structure of the servo rotary motor, the connecting seat, the coupling rod and the small lifting plate of the second embodiment of the present application;

[0026] Fig. 9 This is a schematic diagram of the working principle of the second implementation method of this application;

[0027] Fig.10 This is a schematic diagram of the working status of the second implementation method of the present application.

[0028] Description of the numbers in the figure:

[0029] 1. Moving mold; 2. Fixed mold; 3. Clamping mechanism; 31. Support ring; 32. Clamping arc ring; 33. Small electric extension rod; 4. Servo drive motor; 5. Servo rotary motor; 51. Connecting seat; 52. Coupling rod; 53. Small lifting plate; 6. Fitting groove; 7. Transition frame; 8. Small electric extension sleeve rod; 9. Swing rod; 10. Push plate. DETAILED DESCRIPTION

[0030] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0031] The first implementation method:

[0032] Figure 1-4 An auxiliary device for an injection molding machine is shown, comprising a movable mold 1 and a fixed mold 2, both of which have filling cavities inside. The fixed mold 2 is arranged on one side of the movable mold 1, and a transition frame 7 is fixedly connected to a surface of the fixed mold 2 on a side away from the movable mold 1. A servo drive motor 4 is connected to a surface of the transition frame 7 on a side away from the fixed mold 2, and a servo rotary motor 5 is connected to a surface of the movable mold 1 on a side away from the fixed mold 2.

[0033] A clamping mechanism 3 is arranged on one side of the movable mold 1 close to the fixed mold 2, and the clamping mechanism 3 includes symmetrically arranged small electric extension rods 33. A plurality of support rods are fixedly connected to the surface of one side of the movable mold 1 close to the fixed mold 2, wherein the bottoms of two support rods are connected to the fixed ends of the small electric extension rods 33, and the tail ends of the other support rods are fixedly connected to support rings 31, and a clamping arc ring 32 is arranged above the support ring 31, and a protrusion is connected to the tail end of the clamping arc ring 32, and the top surface of the protrusion is connected to the output end of the small electric extension rod 33. A circular fitting groove 6 is provided on one side of the fixed mold 2 close to the movable mold 1, and the surface of the support ring 31 close to the filling cavity is in contact with the inner wall of the fitting groove 6 close to the filling cavity;

[0034] The fixed mold 2 is internally rotatably connected to two semicircular push plates 10. A circular depression is provided on the surface of one side of the fixed mold 2 close to the transition frame 7. A small electric stretch sleeve rod 8 is fixed inside the circular depression through a bracket. The output end of the small electric stretch sleeve rod 8 is connected to a symmetrically arranged swing rod 9 through a hinge, and the tail end of the swing rod 9 is movably connected to the surface of the push plate 10.

[0035] The diameter of the circular depression is smaller than the diameter of the push plate 10 , and the angle formed between the two swing rods 9 in the initial state is smaller than the angle formed between the two swing rods 9 after the small electric extension sleeve rod 8 is started.

[0036] Specifically, the diameters of the filling cavities in the movable mold 1 and the fixed mold 2 are the same and the diameters of the movable mold 1 and the fixed mold 2 are the same;

[0037] When the plastic product needs to be demoulded, the servo drive motor 4 or the servo rotary motor 5 is selectively started, and after it is started for a period of time, the servo drive motor 4 or the servo rotary motor 5 is closed and the clamping mechanism 3 is opened to start the other motor, and the two motors rotate in opposite directions. In this process, relative friction can be generated between the plastic product in the inner filling cavity and the inner walls of the fixed mold 2 and the movable mold 1, thereby reducing the adhesion between the plastic product and the inner wall of the mold (such as Figure 6 shown);

[0038] Subsequently, an external mobile platform (a horizontal mobile device, which is a prior art and will not be described in detail) is used to drive the movable mold 1 to move away from the fixed mold 2. After the clamping mechanism 3 is separated from the inside of the fitting groove 6, the driving module is used to control the small electric extension sleeve rod 8 and the small electric extension rod 33 to start synchronously. The small electric extension sleeve rod 8 extends downward, driving the clamping arc ring 32 to fit tightly against the surface of the plastic product to form a clamping effect. In this way, in the subsequent process of the plastic product being separated from the fixed mold 2, it still has a stable supporting function and strengthens the connection between the plastic product and the movable mold 1, so that the plastic product can be smoothly separated from the inside of the fixed mold 2 (due to the inner walls of the fixed mold 2 and the movable mold 1 passing through the fixed mold 2). The rotation weakens the bonding effect between the plastic product and the fixed mold 2. When the movable mold 1 is dragged unilaterally, the plastic product may also be separated from the fixed mold 2 and the movable mold 1 at the same time, causing the plastic product to fall and be damaged during the demoulding process). At the same time, the small electric extension sleeve 8 starts to retract, driving the angle between the swing rods 9 to increase, thereby pushing the push plate 10 (the two push plates 10 are in close contact when they are merged, which is the initial state and the angle formed between the two swing rods 9 is small), driving the push plate 10 and the part of the plastic product in the filling cavity in the fixed mold 2 to move outward (in the same direction as the movement of the moving platform), and assisting the plastic product to be separated from the filling cavity in the fixed mold 2 (such as Figure 7 as shown).

[0039] Figure 5It is shown that the arc length of the clamping arc ring 32 is smaller than the arc length of the support ring 31, the support ring 31 is located outside the filling cavity and the support ring 31 and the clamping arc ring 32 are in the same plane, the surface of the protrusion is connected to the tail end of the small electric extension pole 33 and the projection of the protrusion in the vertical direction is located outside the projection of the support ring 31 in the vertical direction.

[0040] Specifically, the support ring 31 has a lifting effect, and the staggered protrusions can drive the clamping arc ring 32 to approach the end of the support ring 31 and clamp the plastic product in the support ring 31 when the small electric extension pole 33 is started.

[0041] The holding arc ring 32 is made of an arc-shaped memory metal strip, and the center of the holding arc ring 32 and the supporting ring 31 are the same. The surface of the memory metal strip close to the filling cavity is connected with an arc-shaped rubber sheet.

[0042] Specifically, the rubber sheet can enhance the contact friction during clamping, while the memory metal strip is provided to facilitate the self-reset of the clamping arc ring 32 .

[0043] It also includes an auxiliary control system, which includes a processor, to which a drive module and a monitoring module are connected, and the drive module is signal-connected to the small electric extension rod 33, the servo rotary motor 5, the servo drive motor 4 and the small electric extension sleeve rod 8, and the monitoring module includes a pressure sensor embedded in the support ring 31 and the movable mold 1, and the two pressure sensors are signal-connected.

[0044] The interlocking groove 6 is located outside the filling cavity, and the cross-sectional width of the interlocking groove 6 is not less than the sum of the projected cross-sectional widths of the support ring 31 and the support rod in the vertical direction, and the ring diameter of the interlocking groove 6 is not less than the sum of the thicknesses of the clamping arc ring 32 and the protrusion.

[0045] Specifically, the distance between the surface of the support ring 31 close to the engaging groove 6 and the tangent point at the bottom end of the filling cavity is less than one tenth of the thickness of the fixed mold 2 itself. Therefore, when the plastic product is placed horizontally on the surface of the support ring 31, there is a difference in the pressure of the plastic product exerted on the support ring 31 and the inner wall of the movable mold 1, but it is within the set threshold (because the support ring 31 and the filling cavity of the movable mold 1 are not on the same axis, the plastic product is in a slightly tilted state, so there is a pressure difference). If the difference between the two pressure values ​​exceeds the set threshold, it indicates that the plastic product is tilted too much and the clamping effect needs to be strengthened to avoid the plastic product falling off and crashing when moving away from the fixed mold 2.

[0046] The second implementation method:

[0047] Figure 8-10It is shown that a connecting seat 51 is installed at the output end of the servo rotary motor 5, and a strip groove is provided on the surface of the connecting seat 51. The inner wall of the strip groove is connected with a coupling rod 52 through an axis rod, and the tail end of the coupling rod 52 is fixedly connected to the surface of the movable mold 1. A small lifting plate 53 connected to the drive module signal is installed on the bottom wall of the strip groove, and the top of the small lifting plate 53 is in engagement contact with the surface of the coupling rod 52.

[0048] In the initial state, the center of the coupling rod 52 and the center of the movable mold 1 are on the same axis, and in the initial state, there is a vertical gap between the top of the coupling rod 52 and the top wall of the strip groove.

[0049] In the first embodiment, after the plastic product is completely separated from the fixed mold 2, it is necessary to use mechanical equipment or other mechanisms to remove the plastic device from the movable mold 1, which causes redundancy in the device of the present invention and easily leads to an increase in the cost of the device. Different from the first embodiment, this embodiment is improved on the basis of the first embodiment.

[0050] Specifically, when the plastic product has not completely separated from the fixed mold 2, the small lifting plate 53 remains extended, lifting the coupling rod 52 so that the center of the coupling rod 52 and the movable mold 1 are on the same axis. After the plastic product is completely separated from the fixed mold 2, the small lifting plate 53 is closed and falls naturally. Under the action of gravity, the coupling rod 52 and the connected movable mold 1 tilt downward, and the clamping mechanism 3 returns to its original state, and the plastic product in the movable mold 1 automatically separates (after rotary grinding, the bonding effect between the plastic product and the inner wall of the movable mold 1 basically disappears, which will not affect the automatic sliding of the plastic product).

[0051] In summary, by installing the servo drive motor 4 and the servo rotary motor 5, before assisting the injection molding machine in demoulding, the surface of the plastic product and the inner wall of the fixed mold 2 and the movable mold 1 are first polished by rotating in the opposite direction to facilitate the smooth removal of the plastic product. Then, the movable mold 1 is driven to move by means of an external mobile platform, and the plastic product is alarmed by means of the clamping mechanism 3 to enhance the separation effect while avoiding falling damage during the process of separation from the fixed mold 2. Then, with the help of the coupling rod 52 and the small lifting plate 53, the plastic product completely separated from the fixed mold 2 can be smoothly separated from the movable mold 1 under the action of its own weight, avoiding the use of other mechanical equipment and controlling the cost of the device.

[0052] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An auxiliary device for an injection molding machine, comprising a movable mold (1) and a fixed mold (2) each having a filling cavity therein, characterized in that: A fixed mold (2) is arranged on one side of the movable mold (1); a transition frame (7) is fixedly connected to a surface of the fixed mold (2) on a side facing away from the movable mold (1); a servo drive motor (4) is connected to a surface of the transition frame (7) on a side facing away from the fixed mold (2); and a servo rotary motor (5) is connected to a surface of the movable mold (1) on a side facing away from the fixed mold (2); A clamping mechanism (3) is arranged on one side of the movable mold (1) close to the fixed mold (2), and the clamping mechanism (3) includes symmetrically arranged small electric extension rods (33). A plurality of support rods are fixedly connected to the surface of one side of the movable mold (1) close to the fixed mold (2), wherein the bottoms of two support rods are connected to the fixed ends of the small electric extension rods (33), and the tail ends of the other support rods are fixedly connected to support rings (31). A clamping arc ring (32) is arranged above the support ring (31), and the tail end of the clamping arc ring (32) is connected to a protrusion, and the top surface of the protrusion is connected to the output end of the small electric extension rod (33). A circular fitting groove (6) is provided on the surface of one side of the fixed mold (2) close to the movable mold (1), and the surface of the support ring (31) close to the filling cavity is in contact with the inner wall of the fitting groove (6) close to the filling cavity; Two semicircular push plates (10) are rotatably connected inside the fixed mold (2); a circular depression is provided on a surface of one side of the fixed mold (2) close to the transition frame (7); a small electric extension sleeve (8) is fixed inside the circular depression via a bracket; the output end of the small electric extension sleeve (8) is connected to a symmetrically arranged swing rod (9) via a hinge, and the tail end of the swing rod (9) is movably connected to the surface of the push plate (10).

2. The auxiliary device for an injection molding machine according to claim 1, characterized in that: The arc length of the clamping arc ring (32) is smaller than the arc length of the support ring (31); the support ring (31) is located outside the filling cavity and the support ring (31) and the clamping arc ring (32) are located in the same plane; the surface of the protrusion is connected to the tail end of the small electric extension rod (33) and the projection of the protrusion in the vertical direction is located outside the projection of the support ring (31) in the vertical direction.

3. The auxiliary device for an injection molding machine according to claim 1, characterized in that: The clamping arc ring (32) is made of an arc-shaped memory metal strip, and the center of the clamping arc ring (32) and the support ring (31) are the same. The surface of the memory metal strip close to the filling cavity is connected to an arc-shaped rubber sheet.

4. The auxiliary device for an injection molding machine according to claim 1, characterized in that: The auxiliary control system also includes a processor, the processor is connected to a drive module and a monitoring module, and the drive module is signal-connected to the small electric extension rod (33), the servo rotary motor (5), the servo drive motor (4) and the small electric extension sleeve rod (8), and the monitoring module includes a pressure sensor embedded in the support ring (31) and the movable mold (1), and the two pressure sensors are signal-connected.

5. The auxiliary device for injection molding machine according to claim 1, characterized in that: The engaging groove (6) is located outside the filling cavity, the cross-sectional width of the engaging groove (6) is not less than the sum of the cross-sectional widths of the projections of the support ring (31) and the support rod in the vertical direction, and the ring diameter of the engaging groove (6) is not less than the sum of the thicknesses of the clamping arc ring (32) and the protrusion.

6. The auxiliary device for an injection molding machine according to claim 1, characterized in that: The diameter of the circular depression is smaller than the diameter of the push plate (10), and the angle formed between the two swinging rods (9) in the initial state is smaller than the angle formed between the two swinging rods (9) after the small electric extension sleeve rod (8) is started.

7. The auxiliary device for an injection molding machine according to claim 4, characterized in that: The output end of the servo rotary motor (5) is provided with a connecting seat (51), the surface of the connecting seat (51) is provided with a strip groove, the inner wall of the strip groove is connected to a coupling rod (52) via a shaft, and the tail end of the coupling rod (52) is fixedly connected to the surface of the movable mold (1), and the bottom wall of the strip groove is provided with a small lifting plate (53) connected to the drive module signal, and the top of the small lifting plate (53) is in chimerical contact with the surface of the coupling rod (52).

8. The auxiliary device for injection molding machine according to claim 7, characterized in that: In the initial state, the center of the coupling rod (52) and the center of the movable mold (1) are on the same axis, and in the initial state, a vertical gap exists between the top of the coupling rod (52) and the top wall of the strip groove.

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