Demolding structure and injection mold

Abstract

The utility model relates to the field of injection molds, and discloses a demolding structure and an injection mold, the injection mold comprises a movable mold and a fixed mold, the demolding structure comprises sliding molds and inserts, the sliding molds are arranged on the fixed mold in a sliding mode, every two sliding molds form a group, the two sliding molds in each group are symmetrical relative to a symmetrical plane, and the symmetrical plane is parallel to the mold closing direction of the injection mold. A mold cavity is formed between the two symmetrical sliding molds, and matching surfaces are arranged on the sliding molds; the insert is arranged on the movable mold and provided with two abutting surfaces which are symmetrical relative to the symmetrical plane, the abutting surfaces obliquely extend in the mold closing direction in the direction away from the symmetrical plane, and the two abutting surfaces of the insert are parallel to the matching surfaces of the two sliding molds of each group respectively and are in surface contact with the matching surfaces of the two sliding molds of each group; when the mold is opened, the movable mold is linked with the insert to move in the direction far away from the fixed mold, and the insert is linked with the matching surfaces of the sliding molds through the abutting surfaces to move relatively, so that the two symmetrical sliding molds are far away from each other. The demolding structure and the injection mold provided by the utility model can solve the problem of how to reduce the volume.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to a demoulding structure and an injection mold. Background Art

[0002] When producing injection molded products, an injection molding machine is usually used to inject plastic into the mold cavity of the injection mold. After the material is molded, the molded product is assisted to leave the mold cavity by the demoulding structure of the injection mold. Finally, the molded product removed from the mold cavity is collected. However, during the demoulding process, the molded material tends to cling to the inner wall of the mold cavity, generating a large clamping force, which can easily damage the injection molded product.

[0003] To this end, the prior art provides a demoulding structure of an injection mold, the demoulding structure includes a movable mold, a fixed mold, two sliders and two diagonal support pins, the slider is slidably connected to the fixed mold, a mold cavity is formed between the two sliders, the diagonal support pins are installed on the movable mold, the two diagonal support pins extend obliquely in a direction away from each other, and are respectively connected to the two sliders in a slidable manner. When the injection mold is demoulded, the diagonal support pins move with the movable mold relative to the fixed mold, and drive the sliders to slide along the extension direction of the corresponding diagonal support pins, so that the two sliders are away from each other to open the mold cavity, and finally, the worker takes out the injection molded product from between the two sliders after demoulding. Among them, a through hole slidably connected to the diagonal support pins is opened on the slider. In order to ensure that the distance between the two sliders after demoulding is sufficient for the worker to take out the injection molded product, the length of the two diagonal support pins and the through hole in the sliding direction needs to be long enough, that is, the length of the slider in the sliding direction also needs to be long enough, and the demoulding structure requires at least two diagonal support pins to drive the two sliders away from each other. Therefore, if the length of the two sliders and at least two diagonal support pins in the sliding direction is extended, the volume of the demoulding structure will be greatly increased, thereby increasing the volume of the injection mold. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] The utility model provides a demoulding structure and an injection mold, which can at least solve the technical problem of how to reduce the volume of the demoulding structure.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a demoulding structure is arranged in an injection mold, the injection mold includes a movable mold and a fixed mold, and the demoulding structure includes:

[0008] The sliding mold is slidably arranged on the fixed mold, the sliding molds are arranged in groups of two, the two sliding molds in each group are symmetrically arranged relative to the symmetry plane, the symmetry plane is arranged parallel to the mold closing direction of the injection mold, a mold cavity is arranged between the two symmetrical sliding molds, and a matching surface is arranged on the sliding mold;

[0009] An insert is arranged on the movable mold, and the insert is provided with two abutment surfaces, the two abutment surfaces are symmetrically arranged relative to the symmetry plane, the abutment surfaces are arranged to extend obliquely in a direction away from the symmetry plane in the mold closing direction, and the two abutment surfaces of the insert are respectively arranged parallel to the matching surfaces of the two sliding molds of each group and are in surface contact;

[0010] When the injection mold is opened, the movable mold links the insert to move away from the fixed mold, and the insert links the matching surface of the sliding mold to move relative to each other through the abutment surface, so that the two symmetrical sliding molds move away from each other.

[0011] It is further provided that the aforementioned fixed mold includes guide members, the guide members are arranged in groups of two, the two guide members in each group are symmetrically arranged relative to the symmetry plane, one end of the guide member is arranged on the fixed mold, and the other end is arranged to extend obliquely in a direction away from the symmetry plane;

[0012] Each group of sliding dies is arranged correspondingly to at least one group of guiding members, and the two guiding members of each group are slidably connected to the two sliding dies of each group respectively.

[0013] It is further provided that the demoulding structure further comprises an elastic member, one end of the elastic member is connected to the sliding mold, and the other end of the elastic member is connected to the fixed mold;

[0014] When the injection mold is closed, the elastic member is compressed between the sliding mold and the fixed mold.

[0015] It is further provided that the aforementioned fixed die is provided with a guide groove for accommodating two symmetrical sliding dies, the guide member is fixedly arranged in the guide groove, the guide groove comprises two inclined groove surfaces which are opposite to the two symmetrical guide members, the inclined groove surfaces are arranged to extend obliquely from the groove bottom of the guide groove in a direction away from the symmetry plane, and the inclination of the inclined groove surface relative to the groove bottom of the guide groove is greater than or equal to the inclination of the guide member relative to the groove bottom of the guide groove;

[0016] A guide surface is arranged on the outer side of the sliding die, and the guide surfaces of the two symmetrical sliding dies are respectively arranged parallel to the two inclined groove surfaces and in surface contact.

[0017] It is further arranged that a limit block is provided on the aforementioned movable mold, and a limit recess is provided on the sliding mold, wherein when the mold cavity is fully opened, the limit block abuts against the limit recess.

[0018] It is further arranged that the aforementioned demoulding structure also includes an ejection device, which is arranged on the movable mold and is used to drive the injection molded product to move out from between the two symmetrical sliding molds.

[0019] It is further provided that the ejection device comprises an ejector pin and a telescopic driving mechanism, wherein the telescopic driving mechanism is connected to the ejector pin and is used to drive the ejector pin to move in or out from between the two symmetrical sliding dies.

[0020] The utility model also provides an injection mold, comprising a movable mold and a fixed mold, and the above-mentioned demoulding structure, wherein the demoulding structure is arranged between the movable mold and the fixed mold.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the demoulding structure and injection mold provided by the utility model have the following beneficial effects:

[0023] The specific demoulding process of the demoulding structure provided by the utility model is as follows: the injection mold is opened, the movable mold is linked with the insert to move in the direction away from the fixed mold, and the insert contacts the matching surfaces of the two symmetrical sliding molds through the abutment surface, thereby linking the two symmetrical sliding molds to slide along the corresponding guide parts at the same time, and move away from each other in the direction away from the symmetry plane to open the mold cavity and complete the demoulding. It can be seen that the demoulding structure can simultaneously control the two symmetrical sliding molds to move away from each other through an insert to complete the demoulding operation, effectively ensuring the synchronization of the demoulding of the two symmetrical sliding molds, and by replacing at least two diagonal support pins with an insert, the volume of the demoulding structure is effectively reduced, thereby reducing the volume of the injection mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a stereoscopic diagram of the demoulding structure and the injection mold in the mold opening state in the embodiment;

[0025] Figure 2 It is a cross-sectional view of the demoulding structure and the injection mold in the mold closing state in the embodiment;

[0026] Figure 3 It is a three-dimensional cross-sectional view of the demoulding structure and the injection mold in the mold opening state in the embodiment;

[0027] Figure 4 It is a schematic diagram of the sliding mold, insert and movable mold in the mold closing state in the embodiment.

[0028] Figure Number:

[0029] 1. Moving mold; 11. Limit block;

[0030] 2. Fixed die; 21. Guide groove; 211. Inclined groove surface;

[0031] 3. Guide parts;

[0032] 4. Sliding die; 41. Guide surface; 42. Matching surface; 43. Position limiting recess;

[0033] 5. insert; 51. abutment surface;

[0034] 6. Ejector device; 61. Ejector pin;

[0035] 7. Mold cavity; 8. Elastic part; 9. Injection molded product. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] The utility model provides a demoulding structure, which is located in an injection mold and is used to solve the problem of how to reduce the volume of the demoulding structure.

[0038] See also Figure 1 , Figure 2 and Figure 4 As shown, Figure 1 It is a stereoscopic diagram of the demoulding structure and the injection mold in the mold opening state in the embodiment. Figure 2 It is a cross-sectional view of the demoulding structure and the injection mold in the mold closing state in the embodiment, Figure 4 Schematic diagram of the sliding mold, insert and movable mold in the mold closing state in the embodiment. The injection mold includes a movable mold 1 and a fixed mold 2, and the demoulding structure includes a sliding mold 4 and an insert 5.

[0039] The sliding molds 4 are slidably connected to the fixed mold 2. The sliding molds 4 are grouped in pairs. The two sliding molds 4 in each group are symmetrically distributed relative to the symmetry plane. The symmetry plane is distributed parallel to the closing direction of the injection mold. A mold cavity 7 is formed between the two symmetrical sliding molds 4. The mold cavity 7 is used for injection molding the injection product 9 required. The sliding mold 4 has a mating surface 42.

[0040] The insert 5 is fixed to the movable mold 1 by welding, screwing or clamping, etc. The insert 5 has two abutment surfaces 51, which are symmetrically distributed relative to the symmetry plane, and the abutment surfaces 51 extend obliquely in the direction away from the symmetry plane in the mold closing direction. The two abutment surfaces 51 of the insert 5 are respectively distributed in parallel with the matching surfaces 42 of the two sliding molds 4 of each group, and the mutually parallel abutment surfaces 51 are in surface contact with the matching surfaces 42.

[0041] The specific demoulding process of the demoulding structure of the above technical solution is as follows: the injection mold is opened, at this time, the movable mold 1 is linked with the insert 5 to move in the direction away from the fixed mold 2, and then the insert 5 is linked with the matching surface 42 of the sliding mold 4 through the abutment surface 51 to move relative to each other, so that the two symmetrical sliding molds 4 slide along the corresponding guide members 3 at the same time and move away from each other, thereby opening the mold cavity 7 and completing the demoulding. It can be seen that the demoulding structure can simultaneously control the two symmetrical sliding molds 4 to move away from each other through an insert 5 to complete the demoulding operation, effectively ensuring the synchronization of the demoulding of the two symmetrical sliding molds 4, and by replacing at least two diagonal support pins with one insert 5, the volume of the demoulding structure is effectively reduced, thereby reducing the volume of the injection mold.

[0042] There is at least one group of the above-mentioned sliding molds 4. The more groups of sliding molds 4 there are, the more products the injection mold can simultaneously injection mold. Each group of the above-mentioned sliding molds 4 is connected to at least one insert 5. The more inserts 5 are connected, the more uniform the force of the sliding mold 4 during the demoulding process can be ensured, and the surface damage of the injection molded product can be effectively prevented. However, the more the number of the above-mentioned sliding molds 4 and inserts 5 is, the more space is occupied, which will lead to a larger volume of the demoulding structure and the injection mold. Therefore, the number of the above-mentioned sliding molds 4 and inserts 5 should be set to a suitable number according to actual use requirements.

[0043] See also Figure 2 and Figure 3 As shown, Figure 3 It is a three-dimensional cross-sectional view of the demoulding structure and the injection mold in the mold opening state in the embodiment. In an embodiment in which the sliding mold 4 and the fixed mold 2 are slidably connected, the fixed mold 2 includes guide members 3, and the guide members 3 are grouped in pairs. The two guide members 3 of each group are symmetrically distributed relative to the symmetry plane. One end of the guide member 3 is fixed to the main body of the fixed mold 2 by welding or screwing, and the other end extends obliquely in the direction away from the symmetry plane. Each group of sliding molds 4 corresponds to at least one group of guide members 3, and the two guide members 3 of each group are respectively slidably connected to the two sliding molds 4 of each group. In this way, the sliding mold 4 is slidably connected to the fixed mold 2 through the guide members 3. The guide members 3 can guide and limit the sliding direction of the sliding mold 4. Combined with the insert 5, it can ensure that the two sliding molds 4 in the same group are demoulded synchronously, and during the demoulding process, the sliding directions of the two sliding molds 4 in the same group are symmetrical and the sliding strokes are the same, thereby improving the demoulding quality.

[0044] The more sets of guide members 3 that are slidably connected to the above-mentioned set of sliding molds 4, the more stability can be ensured during the sliding process of the sliding mold 4. However, the more sets of the above-mentioned guide members 3, the more space is occupied, which will lead to a larger volume of the demoulding structure and the injection mold. Therefore, the number of the above-mentioned guide members 3 should also be set to a suitable number according to actual use requirements.

[0045] See also Figure 3 As shown, the demoulding structure also includes an elastic member 8, one end of the elastic member 8 is connected to the sliding mold 4 by abutment or bonding, and the other end is connected to the fixed mold 2 by abutment or bonding. When the injection mold is closed, the elastic member 8 is compressed between the sliding mold 4 and the fixed mold 2. A compression spring can be used for the elastic member 8. In this way, the elastic member 8 has an elastic force that drives the sliding mold 4 and the fixed mold 2 away from each other. When the injection mold is opened, the elastic member 8 can effectively prevent the sliding mold 4 from returning along the corresponding guide member 3 by its own elastic force, resulting in the surface of the injection molded product 9 being damaged by the sliding mold 4.

[0046] The elastic members 8 are arranged in pairs, and the two elastic members 8 in each group are symmetrically distributed relative to the symmetry plane, and each group of sliding molds 4 corresponds to at least one group of elastic members 8. The more groups of elastic members 8 are connected between each group of sliding molds 4 and the fixed mold 2, the greater the resistance to prevent the sliding mold 4 from returning, and the more it can prevent the surface of the injection molded product 9 from being damaged by the sliding mold 4, but it will also make it difficult for the movable mold 1 to drive the sliding mold 4 to close the mold, and it will also increase the occupied space, so the number of elastic members 8 should also be set to a suitable number according to actual use requirements.

[0047] See also Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment of the fixed mold 2 and the sliding mold 4, the fixed mold 2 has a guide groove 21, and the guide groove 21 is used to accommodate two mutually symmetrical sliding molds 4. The guide member 3 is fixed in the guide groove 21 by welding or screwing, and the guide groove 21 includes two inclined groove surfaces 211 opposite to the two symmetrical guide members 3. The inclined groove surface 211 extends obliquely from the bottom of the guide groove 21 in a direction away from the symmetry plane, and the inclination of the inclined groove surface 211 relative to the bottom of the guide groove 21 is greater than or equal to the inclination of the guide member 3 relative to the bottom of the guide groove 21. The outer side of the sliding mold 4 has a guide surface 41, and the guide surfaces 41 of the two symmetrical sliding molds 4 are respectively distributed in parallel with the two inclined groove surfaces 211, and the mutually parallel guide surfaces 41 are in surface contact with the inclined groove surfaces 211. In this way, during injection molding, the fixed mold 2 can accommodate two mutually symmetrical sliding molds 4 through the guide groove 21, further reducing the volume of the demolding structure and the injection mold; during demolding, the sliding mold 4 can not only slide along the guide member 3, but also slide along the inclined groove surface 211 of the guide groove 21 through the guide surface 41, thereby further guiding the sliding opening and sliding closing directions of the two symmetrical sliding molds 4, and because the inclination of the inclined groove surface 211 relative to the bottom of the guide groove 21 is greater than or equal to the inclination of the guide member 3 relative to the bottom of the guide groove 21, it can also effectively avoid interference between the sliding mold 4 and the groove wall of the guide groove 21 during sliding.

[0048] In this embodiment, the number of the guide grooves 21 is the same as the number of pairs of the sliding dies 4 .

[0049] See also Figure 1 , Figure 3 and Figure 4 As shown, in one embodiment of the movable mold 1 and the sliding mold 4, a limit block 11 is fixed on the movable mold 1 by welding or screwing, and a limit recess 43 is provided on the sliding mold 4, which is opposite to the position of the limit block 11. When the mold cavity 7 is fully opened, the limit block 11 abuts against the limit recess 43. In this way, when demolding, the limit block 11 can limit the sliding stroke of the sliding mold 4, so that the two symmetrical sliding molds 4 cannot continue to move away from each other, effectively preventing the sliding mold 4 from being separated from the guide member 3 or the guide groove 21, resulting in the situation that the two symmetrical sliding molds 4 cannot be synchronously driven to be closed together when the movable mold 1 and the fixed mold 2 are closed.

[0050] See also Figure 1 , Figure 2 and Figure 3 As shown, the demoulding structure further includes an ejector device 6, which is installed on the movable mold 1 and is used to drive the injection molded product 9 to move out from between the two symmetrical sliding molds 4. In this way, the demoulding structure can ensure that the injection molded product 9 is completely moved out of the mold cavity 7 after demoulding through the ejector device 6.

[0051] See also Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment of the ejection device 6, the ejection device 6 includes an ejector pin 61 and a telescopic drive mechanism, the ejector pin 61 is slidably connected to the movable mold 1, the output end of the telescopic drive mechanism (not shown) is axially fixedly connected to the ejector pin 61 by screwing or welding, and the telescopic drive mechanism is used to drive the ejector pin 61 to move in or out from between the two symmetrical sliding molds 4. In this way, after the mold cavity 7 is opened, the telescopic drive mechanism can drive the ejector pin 61 to move in between the two symmetrical sliding molds 4, and after the injection molded product 9 is removed therefrom, the telescopic drive mechanism can drive the ejector pin 61 to return to its original position to avoid interfering with the next injection molding.

[0052] The telescopic drive mechanism can use a telescopic cylinder or an electric rod or other drive mechanism that can drive the ejector pin 61 to move back and forth. In this way, the output end of the telescopic drive mechanism is extended to drive the ejector pin 61 to move between the two symmetrical sliding molds 4. On the contrary, the output end of the telescopic drive mechanism is shortened to drive the ejector pin 61 back to its original position. The telescopic drive mechanism can be fixedly mounted on the movable mold 1 by screwing or the like, or can be fixedly mounted on an external frame equipped with the injection mold. The output end of the telescopic drive mechanism can penetrate the movable mold 1 and be fixedly connected to the ejector pin 61, or the ejector pin 61 can penetrate the movable mold 1 and be fixedly connected to the output end of the telescopic drive mechanism.

[0053] The number of the above-mentioned ejector pins 61 can be the same as the number of the injection molded products 9, or can be more than the number of the injection molded products 9. In this embodiment, the injection molded product 9 includes two bolt parts, and the bolt part is formed by covering the tail of the bolt with injection molding material. When the ejector pin 61 is ejected, it can directly hit the bolt head, effectively preventing the ejector pin 61 from damaging the injection molded product 9. Therefore, in this embodiment, the number of the ejector pins 61 is the same as the number of the bolt parts.

[0054] See also Figure 1 , Figure 2 and Figure 3As shown, the utility model also provides an injection mold, which includes a movable mold 1 and a fixed mold 2, and a demoulding structure as described above, which is installed between the movable mold 1 and the fixed mold 2. The specific implementation process of the demoulding structure can refer to the above description, and this embodiment will not be repeated here. Since the demoulding structure has the above technical effects, the injection mold having the demoulding structure also has corresponding technical effects.

[0055] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A demoulding structure, provided in an injection mold, wherein the injection mold comprises a movable mold and a fixed mold, characterized in that: include: A sliding mold is slidably arranged on the fixed mold, the sliding molds are arranged in groups of two, the two sliding molds in each group are symmetrically arranged relative to a symmetry plane, the symmetry plane is arranged parallel to the mold closing direction of the injection mold, a mold cavity is arranged between the two symmetrical sliding molds, and a matching surface is arranged on the sliding mold; An insert is provided on the movable mold, the insert is provided with two abutment surfaces, the two abutment surfaces are symmetrically arranged relative to the symmetry plane, the abutment surfaces are arranged to extend obliquely in a direction away from the symmetry plane in the mold closing direction, and the two abutment surfaces of the insert are respectively arranged parallel to the matching surfaces of the two sliding molds of each group and are in surface contact; When the injection mold is opened, the movable mold links the insert to move in a direction away from the fixed mold, and the insert links the matching surface of the sliding mold to move relative to each other through the abutment surface, so that the two symmetrical sliding molds move away from each other.

2. A demoulding structure according to claim 1, characterized in that: The fixed die includes guide members, the guide members are arranged in groups of two, the two guide members in each group are symmetrically arranged relative to the symmetry plane, one end of the guide member is arranged on the fixed die, and the other end is arranged to extend obliquely in a direction away from the symmetry plane; Each group of the sliding dies is arranged corresponding to at least one group of the guiding members, and the two guiding members of each group are slidably connected to the two sliding dies of each group respectively.

3. A demoulding structure according to claim 1 or 2, characterized in that: The demoulding structure further comprises an elastic member, one end of which is connected to the sliding mold, and the other end of which is connected to the fixed mold; Wherein, when the injection mold is closed, the elastic member is compressed between the sliding mold and the fixed mold.

4. A demoulding structure according to claim 2, characterized in that: The fixed die is provided with a guide groove for accommodating two symmetrical sliding dies, the guide member is fixed in the guide groove, the guide groove includes two inclined groove surfaces opposite to the two symmetrical guide members, the inclined groove surfaces are inclinedly extended from the groove bottom of the guide groove in a direction away from the symmetry plane, and the inclination of the inclined groove surface relative to the groove bottom of the guide groove is greater than or equal to the inclination of the guide member relative to the groove bottom of the guide groove; A guide surface is arranged on the outer side of the sliding die, and the guide surfaces of the two symmetrical sliding dies are respectively arranged parallel to the two inclined groove surfaces and in surface contact with each other.

5. A demoulding structure according to claim 1, characterized in that: The movable mold is provided with a limit block, and the sliding mold is provided with a limit recess, wherein when the mold cavity is fully opened, the limit block abuts against the limit recess.

6. A demoulding structure according to claim 1, characterized in that: The demoulding structure also includes an ejection device, which is arranged on the movable mold and is used to drive the injection molded product to move out from between the two symmetrical sliding molds.

7. A demoulding structure according to claim 6, characterized in that: The ejection device comprises an ejector pin and a telescopic driving mechanism, wherein the telescopic driving mechanism is connected to the ejector pin and is used for driving the ejector pin to move in or out between the two symmetrical sliding dies.

8. An injection mold, characterized in that: It comprises a movable mold and a fixed mold, and a demoulding structure according to any one of claims 1 to 7, wherein the demoulding structure is arranged between the movable mold and the fixed mold.

Images