Mold closing buffer structure for injection mold

Abstract

The utility model relates to a mold closing buffer structure for an injection mold, which comprises a movable mold and a fixed mold, and a positioning rod extending towards the direction of the fixed mold is fixed on the side surface of the movable mold; a buffer structure is mounted on the side surface of the fixed mold; the buffering structure comprises a driving cylinder, and a starting piston is slidably sealed at the open end of the driving cylinder. The side face of the bottom of the driving cylinder is connected with a buffering cylinder through an oil outlet hole, a linkage piston is slidably sealed in the buffering cylinder, the space between the linkage piston and the oil outlet hole is an oil cavity, the oil cavity is communicated with the space in the driving cylinder through the oil outlet hole, and the space is filled with compressed oil. A spring is installed on the back face of the linkage piston. The driving cylinder and the buffering cylinder which are adjacently arranged in parallel are adopted, and pressure is transmitted between the two cylinders through compressed oil, so that the spring can be mounted on the side surface of the fixed mold, and the occupied space cannot be increased in the overall length direction; in addition, the design of the buffer structure and the positioning rod can simultaneously meet the two functions of positioning guiding and buffering of the movable mold, and the overall structure is simplified.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to a mold clamping buffer structure for injection molds. Background Art

[0002] The movable mold of the injection molding is closed with the fixed mold by a hydraulic cylinder. In order to prevent the hydraulic cylinder from driving the movable mold to directly impact and cause impact wear between the movable mold and the fixed mold, a buffer structure is set between the movable mold and the fixed mold to offset part of the direct impact pressure to slow down the movable mold and avoid direct impact. The existing buffer components are mainly springs, which are installed between the movable mold and the fixed mold. However, the spring still has a certain length under the maximum deformation, which makes the total length of the movable mold and the fixed mold longer, increasing the occupied space. Utility Model Content

[0003] The purpose of the present application is to provide a mold clamping buffer structure for an injection mold, aiming to solve the problems existing in the prior art.

[0004] An embodiment of the present application provides a mold closing buffer structure for an injection mold, comprising a movable mold and a fixed mold, wherein a positioning rod extending toward the fixed mold is fixed on the side of the movable mold; a buffer structure is installed on the side of the fixed mold; the buffer structure comprises a driving cylinder fixed on the side of the fixed mold and corresponding to the positioning rod, and a starting piston is slidably sealed at the open end of the driving cylinder; the bottom side of the driving cylinder is connected to the buffer cylinder through an oil outlet hole, the buffer cylinder and the driving cylinder are installed adjacent to each other and in parallel, a linkage piston is slidably sealed in the buffer cylinder, the space between the linkage piston and the oil outlet hole is an oil chamber, the oil chamber is connected to the space in the driving cylinder through the oil outlet hole, and the space is filled with compressed oil; a spring is installed on the back of the linkage piston, and the linkage piston moves in the buffer cylinder through the spring.

[0005] Furthermore, in the initial position of the spring, the volume of the oil chamber is the smallest, and there is a distance between the linkage piston and the oil outlet hole.

[0006] Furthermore, the spring is located in the air cavity, and an end cover is provided at the end of the buffer cylinder corresponding to the air cavity, and an air hole is opened on the end cover; an inner core is fixed on the inner side of the end cover, and the spring is fixed on the end cover outside the inner core.

[0007] Furthermore, the starting piston is located at the opening end of the driving cylinder in the initial position, and the movable mold moves toward the fixed mold so that the positioning rod presses the starting piston.

[0008] Further, the surface of the starting piston has grooves.

[0009] Furthermore, the fixed mold is installed on the fixed mold plate, and a hydraulic cylinder is installed on the back of the movable mold, and the hydraulic cylinder is installed on the movable mold plate.

[0010] The beneficial effects of the utility model are as follows: a driving cylinder and a buffer cylinder are arranged adjacent to each other in parallel, and pressure is transmitted between the two cylinders through compressed oil, so that the spring can be installed at the side position of the fixed mold, and does not need to be installed in the moving track of the movable mold, so the occupied space in the overall length direction will not be increased; in addition, the design of the buffer structure and the positioning rod can simultaneously meet the two functions of positioning guidance and buffering of the movable mold, simplifying the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0012] Figure 2 It is a structural schematic diagram of the buffer structure in the initial state.

[0013] Figure 3 It is a structural schematic diagram of the buffer structure in working state.

[0014] In the figure:

[0015] 1. Moving mold; 2. Fixed mold; 3. Fixed mold plate; 4. Hydraulic cylinder; 5. Moving mold plate; 6. Positioning rod; 7. Connecting block; 8. Driving cylinder; 9. Starting piston; 10. Groove; 11. Oil outlet hole; 12. Buffer cylinder; 13. Linkage piston; 14. Compressed oil; 15. Spring; 16. Air cavity; 17. End cover; 18. Inner core. DETAILED DESCRIPTION

[0016] 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.

[0017] like Figure 1 As shown, a mold closing buffer structure for an injection mold includes a movable mold 1 and a fixed mold 2. The fixed mold 2 is fixed on a fixed mold plate 3 and connected to an injection molding device. A hydraulic cylinder 4 is installed on the back of the movable mold 1. The hydraulic cylinder 4 is installed on a movable mold plate 5. The movable mold 1 is driven to close and open the mold through the hydraulic cylinder 4. The structure and working process are the same as those of the existing injection mold.

[0018] Among them, a positioning rod 6 extending toward the fixed mold 2 is fixed on the side of the movable mold 1; and a buffer structure is installed on the side of the fixed mold 2. When the mold is closed, the positioning rod 6 is inserted into the buffer mechanism to realize the positioning and buffering of the movable mold 1. In this embodiment, positioning rods 6 and buffer mechanisms are provided on both sides of the movable mold 1 to ensure that the forces on both sides of the movable mold 1 are balanced.

[0019] The positioning rod 6 is installed on the outside of the movable mold 1 through the connecting block 7, which does not affect the mold closing and can be used for various materials or models of the movable mold 1.

[0020] like Figure 2 As shown, the buffer structure includes a drive cylinder 8 fixed to the side of the fixed mold 2 and corresponding to the positioning rod 6. The end of the drive cylinder 8 facing the positioning rod 6 is an open end, and a starting piston 9 is slidably sealed in the open end. The surface of the starting piston 9 has a groove 10. The bottom side of the drive cylinder 8 is connected to the buffer cylinder 12 through an oil outlet 11. The buffer cylinder 12 is installed adjacent to the drive cylinder 8 and parallel. A linkage piston 13 is slidably sealed in the buffer cylinder 12. The space between the linkage piston 13 and the oil outlet 11 is an oil chamber. The oil chamber is connected to the space inside the drive cylinder 8 through the oil outlet 11, and the space is filled with compressed oil 14. When the positioning rod 6 presses the starting piston 9, the starting piston 9 can press the compressed oil 14 into the oil chamber of the buffer cylinder 12 through the oil outlet 11 for temporary storage.

[0021] A spring 15 is installed on the back of the linkage piston 13, and the linkage piston 13 moves in the buffer cylinder 12 through the spring 15. When the compressed oil 14 enters the oil chamber, it pushes the linkage piston 13, causing compression on the spring 15. The spring 15 deforms and absorbs the pressure, which is transmitted to the positioning rod 6 through the compressed oil 14, resulting in a decrease in the mold closing speed of the positioning rod 6 and the movable mold 1, thereby avoiding direct impact and wear of the movable mold 1 and the fixed mold 2 during mold closing.

[0022] The spring 15 is located in the air cavity 16. The end of the buffer cylinder 12 corresponding to the air cavity 16 is provided with an end cap 17. The end cap 17 is provided with air holes for balancing the internal air pressure. An inner core 18 is fixed to the inner side of the end cap 17. The spring 15 is fixed to the end cap 17 outside the inner core 18.

[0023] In the initial position of the spring 15, if Figure 2 As shown, the volume of the oil chamber is the smallest, and there is a distance between the linkage piston 13 and the oil outlet hole 11. The starting piston 9 is located at the open end of the drive cylinder 8 in the initial position, and the compressed oil 14 fills the entire drive cylinder 8.

[0024] like Figure 3 As shown, when the movable mold 1 moves toward the fixed mold 2, the positioning rod 6 presses the starting piston 9, so that the starting piston 9 compresses the compressed oil 14 in the driving cylinder 8. The compressed oil 14 enters the oil chamber through the oil outlet 11 and pushes the linkage piston 13 to generate pressure on the spring 15 to deform the spring 15. The spring 15 absorbs part of the pressure and transmits it to the positioning rod 6 to slow down the positioning rod 6. In the subsequent mold opening, the elastic force of the spring 15 can push the movable mold 1 to move, assist the hydraulic cylinder 4 to start, and reduce the instantaneous working pressure of the hydraulic cylinder 4, which is beneficial to prolonging the life of the hydraulic cylinder 4.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A mold clamping buffer structure for an injection mold, characterized in that: It comprises a movable mould and a fixed mould, wherein a positioning rod extending towards the fixed mould is fixed on the side of the movable mould; a buffer structure is installed on the side of the fixed mould; the buffer structure comprises a driving cylinder fixed on the side of the fixed mould and corresponding to the positioning rod, and a starting piston is slidably sealed at the open end of the driving cylinder; the bottom side of the driving cylinder is connected to the buffer cylinder through an oil outlet hole, the buffer cylinder and the driving cylinder are installed adjacent to each other and in parallel, a linkage piston is slidably sealed in the buffer cylinder, the space between the linkage piston and the oil outlet hole is an oil chamber, the oil chamber is connected to the space in the driving cylinder through the oil outlet hole, and the space is filled with compressed oil; a spring is installed on the back of the linkage piston, and the linkage piston moves in the buffer cylinder through the spring.

2. The mold clamping cushioning structure for injection mold according to claim 1, characterized in that: In the initial position of the spring, the volume of the oil chamber is the smallest, and there is a distance between the linkage piston and the oil outlet hole.

3. The mold clamping buffer structure for injection mold according to claim 2, characterized in that: The spring is located in the air cavity, and an end cover is provided at the end of the buffer cylinder corresponding to the air cavity, and an air hole is opened on the end cover; an inner core is fixed on the inner side of the end cover, and the spring is fixed on the end cover outside the inner core.

4. The mold clamping buffer structure for injection mold according to claim 2, characterized in that: The starting piston is located at the opening end of the driving cylinder in the initial position, and the movable mold moves toward the fixed mold so that the positioning rod presses the starting piston.

5. The mold clamping cushioning structure for injection mold according to claim 4, characterized in that: The surface of the starting piston has grooves.

6. The mold clamping buffer structure for injection mold according to claim 1, characterized in that: The fixed die is installed on the fixed die plate, and a hydraulic cylinder is installed on the back of the movable die, and the hydraulic cylinder is installed on the movable die plate.

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