Automatic demoulding device for injection mold

Abstract

The present invention discloses an automatic demoulding device for an injection mold, and relates to the technical field of injection molds. The injection mold comprises a static mold base and a dynamic mold base which are placed horizontally opposite to each other, a static mold wedge is embedded in the static mold base, a first cavity is provided inside the dynamic mold base, a through groove connected to the first cavity is provided on one side of the dynamic mold base close to the static mold base, the first cavity is used to accommodate the dynamic mold wedge, and the dynamic mold wedge can extend out of the first cavity through the through groove so as to cooperate with the static mold wedge and construct a casting cavity; a tension spring is arranged between the dynamic mold wedge and the first cavity, and the tension spring is used to pull the dynamic mold wedge and accommodate it in the first cavity; the automatic demoulding device also comprises a driving component for driving the dynamic mold wedge to extend out of the first cavity, and by configuring the dynamic mold wedge as a movable structure, demoulding is more flexible, space is saved, and efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to an automatic demoulding device for injection molds. Background Art

[0002] Injection molds are important tools for manufacturing plastic products. Their working principle is to inject molten plastic into the mold and form plastic parts of the desired shape after cooling and solidification. Injection molds are widely used in many fields such as automobiles, electronics, medical treatment, packaging and industrial equipment. They have the characteristics of repeatability, diversity, high efficiency, durability, energy saving and environmental protection.

[0003] With the advancement of intelligent transformation of manufacturing industry, automatic demoulding has become an important direction of injection mold technology development. The principle of automatic demoulding is: after injection molding is completed, the injection molded product is automatically separated by a robot. However, the existing mold opening technology has a series of problems when facing injection molded products with longer lengths.

[0004] First, if Figure 1 In order to ensure that the injection molded product can be smoothly removed from the punch, the static mold base and the dynamic mold base need to maintain a certain distance when the mold is opened. This distance usually needs to be at least twice the length of the injection molded product to ensure that the product will not be hindered by the mold when it is pushed out by the robot. However, when the injection molded product is longer, this distance will also increase accordingly, resulting in a larger overall size of the mold, which in turn occupies more factory space. This not only increases production costs, but also limits the application of injection molding machines in small spaces.

[0005] Secondly, in order to meet the larger mold opening spacing requirements, a longer hydraulic cylinder is required to drive the movement of the movable mold base. The increase in the length of the hydraulic cylinder not only increases the manufacturing cost, but may also cause the response speed of the hydraulic system to slow down, thereby affecting the overall production efficiency. In addition, the longer hydraulic cylinder also brings additional challenges in installation and maintenance, increasing the complexity and time cost of the operation.

[0006] Therefore, it is necessary to provide an automatic demoulding device for an injection mold to solve the above problems. Summary of the invention

[0007] In order to solve the above problems, the present invention provides the following technical solutions: an automatic demoulding device for an injection mold, used for automatically demoulding the injection mold, the injection mold comprising a static mold seat and a dynamic mold seat placed horizontally opposite to each other, a static mold wedge is embedded in the static mold seat, the dynamic mold seat has a first cavity inside, a through groove connected to the first cavity is opened on one side of the dynamic mold seat close to the static mold seat, the first cavity is used to accommodate the dynamic mold wedge, the dynamic mold wedge can extend out of the first cavity through the through groove, so as to cooperate with the static mold wedge and construct a casting cavity;

[0008] A tension spring is provided between the movable mold wedge and the first cavity, and the tension spring is used to pull the movable mold wedge and accommodate it in the first cavity;

[0009] The automatic demoulding device also includes a driving assembly for driving the movable mold wedge to extend out of the first cavity.

[0010] Preferably, a limiting groove is provided on one side of the through groove close to the first chamber, and a sealing limiting portion corresponding to the through groove and the limiting groove is arranged on the movable mold wedge;

[0011] The cooperation between the sealing limit portion and the through groove can realize a sealed connection between the movable mold wedge and the through groove during injection molding, and the cooperation between the sealing limit portion and the limit groove can limit the extent to which the movable mold wedge protrudes from the first cavity.

[0012] Preferably, when the mold is opened, the distance between the static mold base and the dynamic mold base is greater than the length of the injection molded product and less than 1.1 times the length of the injection molded product.

[0013] Preferably, a push plate is fixed to the side of the movable mold seat away from the static mold seat, a nut is embedded in the push plate, a bolt is threadedly connected to the nut, one end of the bolt close to the movable mold wedge is connected to the tension spring, and a swivel seat is fixed to the other end of the tension spring, and the swivel seat is rotatably arranged in the movable mold wedge.

[0014] Preferably, the driving assembly includes a driving rod and a shifting rod, wherein the driving rod is fixed to one end of the static mold base close to the dynamic mold base, the shifting rod is rotatably arranged in the first cavity through an axis, a torsion spring is arranged on the axis to provide reset for the shifting rod, the driving rod can extend into the first cavity and then push the shifting rod to rotate, so as to drive the dynamic mold wedge to overcome the tension of the tension spring and move.

[0015] Preferably, the driving rod is divided into two parts, which are connected by an elastic member, and the elastic member is configured as follows: the minimum force of the elastic member being deformed by being squeezed is greater than the tension required when the tension spring is stretched to a first state, and the first state is: the sealing limit portion just cooperates with the through groove and the limit groove.

[0016] Preferably, the push plate is pushed by a push cylinder, and the movable mold base is slidably arranged on a track.

[0017] Preferably, at least one guide rod is fixed on the static mold base, and a plurality of guide holes connected to the first chamber and matched with the guide rod are opened on the dynamic mold base, and in any state, the guide rod contacts the guide holes.

[0018] Preferably, the automatic demoulding device also includes a linear drive component, a telescopic arm, an adjustment plate and an adjustment rod, wherein the linear drive component has a horizontal movable end, the telescopic arm is fixed on the horizontal movable end, the telescopic arm has a vertical movable end, the adjustment plate is fixed on the vertical movable end, and a plurality of adjustment rods are threadedly connected to the adjustment plate.

[0019] Compared with the prior art, the present invention provides an automatic demoulding device for injection molds, which has the following beneficial effects:

[0020] In the present invention, the movable mold wedge is designed as a movable component. This change makes it unnecessary to maintain the spacing between the static mold base and the movable mold base at twice or more the length of the injection molded product when the mold is opened. Instead, it is only necessary to maintain a spacing slightly larger than the length of the injection molded product but less than 1.1 times the length of the injection molded product. This improvement significantly reduces the overall size of the injection mold when the mold is opened, thereby saving factory space.

[0021] The method of driving the dynamic mold wedge block in the present invention is also optimized. Unlike the prior art, which may require an additional power source, the present invention can achieve the movement of the dynamic mold wedge block by only using the movement of the dynamic mold base and the tension of the tension spring. This driving method is not only simple and reliable, but also reduces manufacturing costs and maintenance difficulties. At the same time, since the use of power sources is reduced, energy consumption and environmental pollution are also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the main structure of an injection mold in the prior art;

[0023] Figure 2 A schematic diagram of the main structure of an automatic demoulding device for an injection mold Figure 1 ;

[0024] Figure 3 It is a schematic diagram of the structure of bolts and tension springs in an automatic demoulding device for an injection mold;

[0025] Figure 4 A schematic diagram of the main structure of an automatic demoulding device for an injection mold Figure 2 ;

[0026] In the figure: 1. static mold seat; 2. static mold wedge; 3. pouring gate; 4. dynamic mold seat; 41. through groove; 42. limit groove; 5. dynamic mold wedge; 51. sealing limit part; 6. push plate; 7. lever; 8. driving rod; 81. elastic member; 9. guide rod; 10. track; 11. push cylinder; 12. linear driving member; 13. telescopic arm; 14. adjustment plate; 15. adjustment rod; 16. nut; 17. bolt; 18. tension spring; 19. swivel seat. DETAILED DESCRIPTION

[0027] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned description of the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0028] Example 1: Please refer to Figure 1-Figure 3 In an embodiment of the present invention, an automatic demoulding device for an injection mold is provided, which is used for automatically demoulding the injection mold. The injection mold includes a static mold base 1 and a dynamic mold base 4 which are placed horizontally opposite to each other. A static mold wedge 2 is embedded in the static mold base 1. A pouring port 3 corresponding to the static mold wedge 2 is also provided on one side of the static mold base 1. The dynamic mold base 4 has a first cavity inside. A through groove 41 communicating with the first cavity is provided on one side of the dynamic mold base 4 close to the static mold base 1. The first cavity is used to accommodate a dynamic mold wedge 5. The dynamic mold wedge 5 can extend out of the first cavity through the through groove 41 so as to cooperate with the static mold wedge 2 and construct a casting cavity.

[0029] A tension spring 18 is provided between the movable mold wedge 5 and the first cavity, and the tension spring 18 is used to pull the movable mold wedge 5 and place it in the first cavity;

[0030] The automatic demoulding device further comprises a driving assembly for driving the movable mold wedge 5 to extend out of the first cavity.

[0031] In the prior art, Figure 1In order to ensure that the injection molded product can be smoothly removed from the punch, the static mold base and the dynamic mold base 4 need to maintain a certain distance when the mold is opened. This distance usually needs to be at least twice the length of the injection molded product to ensure that the product will not be obstructed by the mold when it is pushed out by the robot. However, when the length of the injection molded product is longer, this distance will also increase accordingly, resulting in a larger overall size of the mold, which in turn occupies more factory space. This not only increases production costs, but also limits the application of injection molding machines in small spaces. Secondly, in order to meet the larger mold opening spacing requirements, a longer hydraulic cylinder is required to drive the movement of the dynamic mold base 4. The increase in the length of the hydraulic cylinder not only increases the manufacturing cost, but may also cause the response speed of the hydraulic system to slow down, thereby affecting the overall production efficiency. In addition, longer hydraulic cylinders also bring additional challenges in installation and maintenance, increasing the complexity and time cost of operations.

[0032] However, in this embodiment, different from the prior art, the movable mold wedge 5 is movably arranged, so that when the mold is opened, the distance between the static mold base 1 and the movable mold base 4 is greater than the length of the injection molded product and less than 1.1 times the length of the injection molded product. In addition, after the mold is opened, the movable mold wedge 5 moves to the first cavity, which enables the injection molded product to automatically detach from the movable mold wedge 5 and realize automatic demolding.

[0033] In addition, in this embodiment, the method of driving the movable mold wedge 5 is relatively simple and reliable, and no additional power is required. It can be achieved by only moving the movable mold base 4 and pulling the tension spring 18, which is described in detail below.

[0034] In this embodiment, a limiting groove 42 is provided on one side of the through groove 41 close to the first chamber, and a sealing limiting portion 51 corresponding to the through groove 41 and the limiting groove 42 is disposed on the movable mold wedge 5;

[0035] The cooperation between the sealing limit portion 51 and the through groove 41 can realize a sealed connection between the movable mold wedge 5 and the through groove 41 during injection molding, and the cooperation between the sealing limit portion 51 and the limit groove 42 can limit the extent to which the movable mold wedge 5 extends out of the first cavity.

[0036] During the injection molding process, the dynamic mold wedge 5 needs to extend out of the through slot 41 to form a casting chamber with the static mold wedge 2. The design of the sealing limiter 51 ensures a tight fit between the dynamic mold wedge 5 and the through slot 41, preventing the molten plastic from leaking to the outside of the injection mold during the injection molding process, thereby ensuring the quality and integrity of the injection molded product.

[0037] The design of the limiting groove 42 precisely controls the extent to which the movable mold wedge 5 extends out of the first cavity. When the movable mold wedge 5 extends to a certain extent, the sealing limiting portion 51 enters the limiting groove 42, thereby limiting the further extension of the movable mold wedge 5. This design ensures the correct fit between the movable mold wedge 5 and the static mold wedge 2, and avoids damage to the injection mold or defects in the injection molded product caused by excessive extension.

[0038] A push plate 6 is fixed to the side of the movable mold base 4 away from the static mold base 1, a nut 16 is embedded in the push plate 6, a bolt 17 is threadedly connected in the nut 16, one end of the bolt 17 close to the movable mold wedge block 5 is connected to the tension spring 18, and a swivel seat 19 is fixed to the other end of the tension spring 18, and the swivel seat 19 is rotatably set in the movable mold wedge block 5.

[0039] The push plate 6 is fixed to the side of the movable mold base 4 away from the static mold base 1, providing a stable support point for the bolt 17 and the nut 16. The nut 16 is embedded in the push plate 6 and forms a threaded connection with the bolt 17. This design allows the preload force of the tension spring 18 to be adjusted by rotating the bolt 17, thereby adjusting the force and speed of the movable mold wedge 5 during the extension and retraction process.

[0040] The driving assembly includes a driving rod 8 and a shifting rod 7, wherein the driving rod 8 is fixed to one end of the static mold base 1 close to the dynamic mold base 4, and the shifting rod 7 is rotatably arranged in the first cavity through an axis, and a torsion spring is arranged on the axis to provide reset for the shifting rod 7. The driving rod 8 can extend into the first cavity and then push the shifting rod 7 to rotate, so as to drive the dynamic mold wedge block 5 to overcome the tension of the tension spring 18 and move.

[0041] Therefore, the implementation includes the following steps:

[0042] Before injection molding begins, the injection mold is in an open state, and the lever 7 is kept in the initial position under the effect of the torsion spring. At this moment, the movable mold wedge 5 is pulled into the first cavity by the tension spring 18.

[0043] During the closing process of the injection mold, the driving rod 8 extends into the first cavity and drives the lever 7 to rotate. The rotation of the lever 7 drives the movable mold wedge 5 to overcome the tension of the tension spring 18 and extend, and cooperate with the static mold wedge 2 to form a casting cavity.

[0044] After the injection molding is completed, the injection mold is opened. At this time, the lever 7 is reset under the effect of the torsion spring, and the movable mold wedge 5 is pulled back into the first cavity under the pull of the tension spring 18, so as to realize automatic demoulding.

[0045] Furthermore, the driving rod 8 is divided into two parts, which are connected by an elastic member 81. The elastic member 81 is configured as follows: the minimum force for the elastic member 81 to be deformed by being squeezed is greater than the tension required when the tension spring 18 is stretched to a first state. The first state is that the sealing limit portion 51 just cooperates with the through groove 41 and the limit groove 42.

[0046] It should be explained that when the static mold base 1 and the dynamic mold base 4 begin to close, the driving rod 8 contacts the lever 7 and drives it to rotate. When the sealing limit portion 51 of the dynamic mold wedge block 5 cooperates with the through groove 41 and the limit groove 42, if there is still a gap between the static mold base 1 and the dynamic mold base 4, the dynamic mold base 4 will continue to move. At this time, the elastic member 81 will be compressed to absorb this part of the additional movement until the static mold base 1 and the dynamic mold base 4 just contact. This design ensures that the injection mold can reach the best state during the closing process, that is, the dynamic mold wedge block 5 accurately extends and cooperates with the static mold wedge block 2, and the gap between the static mold base 1 and the dynamic mold base 4 is completely eliminated.

[0047] In addition, the elastic member 81 is configured such that the minimum force of the elastic member 81 being deformed by being squeezed is greater than the tension required when the tension spring 18 is stretched to the first state, and the first state is that the sealing limit portion 51 just cooperates with the through groove 41 and the limit groove 42. The purpose of such arrangement is that when the driving rod 8 pushes the lever 7 to rotate so as to drive the movable mold wedge block 5 to overcome the pulling force of the tension spring 18 and move, the sealing limit portion 51 of the movable mold wedge block 5 can smoothly cooperate with the through groove 41 and the limit groove 42. During this process, the elastic member 81 should not be compressed, otherwise the sealing limit portion 51 of the movable mold wedge block 5 will be difficult to smoothly cooperate with the through groove 41 and the limit groove 42. After the sealing limit portion 51 of the movable mold wedge block 5 can smoothly cooperate with the through groove 41 and the limit groove 42, if there is still a gap between the static mold base 1 and the movable mold base 4, the movable mold base 4 continues to move until the static mold base 1 and the movable mold base 4 are just in contact, and at this time the elastic member 81 is compressed to cooperate with this state.

[0048] In order to improve the stability of the movement of the movable mold base 4 , in this embodiment, the push plate 6 is pushed by a push cylinder 11 , and the movable mold base 4 is slidably disposed on a track 10 .

[0049] In order to improve the stability of the movement of the movable mold base 4, in this embodiment, at least one guide rod 9 is fixed to the static mold base 1, and a plurality of guide holes connected to the first chamber and matched with the guide rod 9 are opened on the movable mold base 4, and in any state, the guide rod 9 contacts the guide hole.

[0050] In order to improve the stability of the movement of the movable mold wedge block 5 , the side of the movable mold wedge block 5 away from the static mold base 1 can also be fixedly connected to a sliding rod (not shown in the figure), and the sliding rod slides through the push plate 6 .

[0051] Example 2: Please refer to Figure 4 , which is different from the first embodiment in that, in order to achieve full automation, the automatic demoulding device also includes a linear drive member 12, a telescopic arm 13, an adjustment plate 14 and an adjustment rod 15, wherein the linear drive member 12 has a horizontal moving end, the telescopic arm 13 is fixed on the horizontal moving end, the telescopic arm 13 has a vertical moving end, the adjustment plate 14 is fixed on the vertical moving end, and a plurality of adjustment rods 15 are threadedly connected to the adjustment plate 14.

[0052] By adjusting the plurality of adjusting rods 15 , it can be adapted to the shape of the injection molded product, thereby achieving the lifting of the injection molded product, and then the injection molded product can be sent to a designated position using the telescopic arm 13 and the linear drive member 12 .

[0053] The linear drive component 12 is any one of a screw-nut pair mechanism, an electric telescopic rod, a hydraulic cylinder, and a pneumatic cylinder.

[0054] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic demoulding device for an injection mold, used for automatically demoulding the injection mold, the injection mold comprising a static mold base (1) and a dynamic mold base (4) placed horizontally opposite to each other, a static mold wedge (2) embedded in the static mold base (1), characterized in that: The movable mold base (4) has a first cavity inside, and a through groove (41) communicating with the first cavity is provided on a side of the movable mold base (4) close to the static mold base (1). The first cavity is used to accommodate a movable mold wedge (5). The movable mold wedge (5) can extend out of the first cavity through the through groove (41) so as to cooperate with the static mold wedge (2) and form a casting cavity. A tension spring (18) is provided between the movable mold wedge (5) and the first cavity. The tension spring (18) is used to pull the movable mold wedge (5) and accommodate it in the first cavity. The automatic demoulding device also includes a driving component for driving the movable mold wedge (5) to extend out of the first cavity. The driving assembly comprises a driving rod (8) and a shifting rod (7), wherein the driving rod (8) is fixed to one end of the static mold base (1) close to the dynamic mold base (4), and the shifting rod (7) is rotatably arranged in the first cavity through an axis body, and a torsion spring is arranged on the axis body for providing reset for the shifting rod (7). The driving rod (8) can extend into the first cavity and then push the shifting rod (7) to rotate, so as to drive the dynamic mold wedge (5) to overcome the tension of the tension spring (18) and move.

2. The automatic demoulding device for injection mold according to claim 1, characterized in that: A limiting groove (42) is provided on one side of the through groove (41) close to the first cavity, and a sealing limiting portion (51) corresponding to the through groove (41) and the limiting groove (42) is arranged on the movable mold wedge block (5); the sealing limiting portion (51) cooperates with the through groove (41) to achieve a sealed connection between the movable mold wedge block (5) and the through groove (41) during injection molding, and the sealing limiting portion (51) cooperates with the limiting groove (42) to limit the extent to which the movable mold wedge block (5) protrudes from the first cavity.

3. The automatic demoulding device for injection mold according to claim 1, characterized in that: When the mold is opened, the distance between the static mold base (1) and the dynamic mold base (4) is greater than the length of the injection molded product and less than 1.1 times the length of the injection molded product.

4. The automatic demoulding device for injection mold according to claim 1, characterized in that: A push plate (6) is fixed to the side of the movable mold base (4) away from the static mold base (1), a nut (16) is embedded in the push plate (6), a bolt (17) is threadedly connected in the nut (16), one end of the bolt (17) close to the movable mold wedge block (5) is connected to the tension spring (18), and a swivel seat (19) is fixed to the other end of the tension spring (18), and the swivel seat (19) is rotatably arranged in the movable mold wedge block (5).

5. The automatic demoulding device for injection mold according to claim 2, characterized in that: The driving rod (8) is divided into two parts, and the two parts are connected by an elastic member (81). The elastic member (81) is configured so that the minimum force of the elastic member (81) being deformed by being squeezed is greater than the tension required when the tension spring (18) is stretched to a first state. The first state is that the sealing limit portion (51) just fits with the through groove (41) and the limit groove (42).

6. The automatic demoulding device for injection mold according to claim 4, characterized in that: The push plate (6) is pushed by a push cylinder (11), and the movable mold base (4) is slidably arranged on a track (10).

7. The automatic demoulding device for injection mold according to claim 1, characterized in that: At least one guide rod (9) is also fixed to the static mold base (1), and a plurality of guide holes communicating with the first chamber and cooperating with the guide rod (9) are formed on the dynamic mold base (4), and in any state, the guide rod (9) contacts the guide holes.

8. The automatic demoulding device for injection mold according to claim 1, characterized in that: The automatic demoulding device further comprises a linear drive member (12), a telescopic arm (13), an adjustment plate (14) and an adjustment rod (15), wherein the linear drive member (12) has a horizontal movable end, the telescopic arm (13) is fixed to the horizontal movable end, the telescopic arm (13) has a vertical movable end, the adjustment plate (14) is fixed to the vertical movable end, and a plurality of adjustment rods (15) are threadedly connected to the adjustment plate (14).

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