A low friction mold opening structure for injection mold

Abstract

The utility model discloses a small friction mold opening structure of an injection mold, comprising an upper mold base and a lower mold base, the upper mold base comprises a panel, a stripping plate is arranged under the panel, an upper mold plate is arranged under the stripping plate, four locking blocks are fixedly installed on the side of the lower mold base, a step is arranged at one end of the locking block, a pull rod is passed through the locking block, the pull rod is fixedly installed on the side of the panel, a receiving groove is arranged on the side of the upper mold plate, a spring block is installed in the receiving groove, a spring is arranged between the spring block and the upper mold plate, the upper end surface of the spring block abuts against the lower end surface of the step, a boss is arranged at the end of the pull rod facing the lower mold base, an inclined surface is arranged on one side of the boss facing the spring block, a groove is arranged on the inclined surface, a plurality of pulleys are installed in the groove, a rotating shaft is passed through the pulley, and the pulley can abut against the spring block. The utility model can control the mold opening sequence of different mold plates, and reduce the friction between the pull rod and the spring block by the pulley, so as to reduce the wear of the pull rod and the spring block, thereby extending the service life of the mold opening structure.

Description

Technical Field

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

[0002] Nowadays, plastic products have been widely used in people's daily life, and the production of plastic products depends on molds. Since the development of industry, many molds with different structures have been born, including two-plate molds and three-plate molds. The three-plate mold can realize the function of separating the runner condensate from the plastic parts when opening the mold due to its unique structure. To achieve the above function, when opening the three-plate mold, it is necessary to separate the stripper plate and the upper mold plate first, separate the plastic parts from the runner condensate, and then separate the upper mold plate and the lower mold plate to take out the plastic parts;

[0003] The Chinese patent document "CN218256591U, a device for controlling the mold opening sequence" includes a mold and a mold opening mechanism, the mold includes a B plate, an A plate, an upper code template and a nozzle plate, the A plate is arranged above the B plate, the upper code template is arranged above the A plate, the nozzle plate is arranged above the upper code template, the mold opening mechanism includes a locking block, a pull rod, a spring block and a spring, the locking block is mounted on the B plate, the pull rod is mounted on the nozzle plate, the spring block is mounted on the A plate, and springs are symmetrically installed on both sides of the bottom of the spring block;

[0004] The device uses a pull rod that slides down to press down a spring block to control the order in which different templates are separated. When in use, there is a large friction between the pull rod and the spring block, which is prone to wear after long-term use, causing the slope of the contact surface between the pull rod and the spring block to increase, making it impossible for the spring block to fully enter the mold, resulting in the mold being unable to open smoothly, increasing the maintenance cost of the mold. Utility Model Content

[0005] The utility model aims to provide a low-friction mold opening structure for an injection mold to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An injection mold low-friction mold opening structure comprises an upper mold base and a lower mold base, wherein the upper mold base comprises a panel, a stripper plate is arranged below the panel, and an upper mold plate is arranged below the stripper plate;

[0008] Four locking blocks are fixedly installed on the side of the lower mold base, one end of the locking block is provided with a step, a pull rod is passed through the locking block, and the pull rod is fixedly installed on the side of the panel. A receiving groove is opened on the side of the upper template, a spring block is installed in the receiving groove, a spring is installed between the spring block and the upper template, the upper end surface of the spring block abuts against the lower end surface of the step, and a boss facing the lower mold base is provided on the end of the pull rod, and a slope is provided on the side of the boss facing the spring block, a groove is opened on the slope, and a plurality of pulleys are installed in the groove, a rotating shaft is passed through the pulley, and the pulley can abut against the spring block.

[0009] Furthermore, a first card slot is provided on the side of the panel, a pull rod fixed by screws is installed in the first card slot, and a second card slot is provided on the side of the lower mold base, a locking block fixed by screws is installed in the second card slot.

[0010] Furthermore, a base is embedded in the groove, and the base is rotatably connected to the pulley via a rotating shaft, so that the base and the pulley form a whole.

[0011] Furthermore, a limit groove is provided in the middle of the spring block, a spring is installed in the limit groove, a limit screw is passed through the limit groove, the limit screw passes through the spring, the spring block is connected to the upper template through the limit screw, and a slope 2 is provided on the side of the spring block facing the slope 1, and the slope 2 can interfere with the pulley.

[0012] Furthermore, an upper mold core is installed in the upper mold plate, a lower mold core is installed in the lower mold base, two side mold cores are slidably connected to the lower mold core, a sliding groove for sliding the side mold cores is provided on the lower mold base, a sliding block is provided in the sliding groove, the sliding block is fixedly connected to the side mold cores, and a cylinder is fixedly installed on both side surfaces of the lower mold base, and the output end of the cylinder is fixedly connected to the sliding block.

[0013] Furthermore, flow channels are provided inside the panel, the stripping plate and the upper template, and a plurality of water inlets and water outlets are respectively provided on the sides of the three and connected to the flow channels.

[0014] The beneficial effects of the utility model are as follows: during the mold opening process, the locking block will first clamp the spring block, and then clamp the upper template, so that the upper template cannot be separated from the lower mold base temporarily, and the upper template is separated from the stripping plate first. When separated for a distance, the pulley in the front end of the pull rod will conflict with the inclined surface of the spring block. During the continuous mold opening process, there is rolling friction between the pulley and the spring block, which forces the spring block to be pressed downward until the spring block is completely pressed into the upper template, and the locking block is disassociated from the spring block, and the upper template and the lower mold base are separated, thereby realizing the control of the mold opening sequence of different templates. The pull rod drives the pulley to roll and press the spring block, which replaces the existing mold opening structure using the pull rod to slide and press the spring block, and changes the sliding friction between the pull rod and the spring block to rolling friction, which greatly reduces the friction between the pull rod and the spring block, reduces the wear of the pull rod and the spring block, extends the service life of the mold opening structure, and reduces the maintenance cost.

[0015] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : The overall schematic diagram of the utility model.

[0017] Figure 2 : Assembly diagram of the utility model.

[0018] Figure 3 : Explosion diagram of the utility model.

[0019] Figure 4 : Schematic diagram of card slot one, card slot two and storage slot.

[0020] Figure 5 : Sectional view of the bullet block assembled on the upper template.

[0021] Figure 6 : Exploded view of upper mold core, lower mold core and side mold core.

[0022] Figure 7 : Schematic diagram of base and pulley assembly

[0023] Figure numerals: 1, upper die base; 2, lower die base; 11, panel; 12, stripper plate; 13, upper die plate; 21, locking block; 22, slot 2; 23, lower die core; 24, slide groove; 25, side die core; 26, slider; 27, cylinder; 111, pull rod; 112, water inlet; 113, water outlet; 114, slot 1; 131, screw; 132, spring block; 133, spring; 134, storage slot; 135, upper die core; 211, step; 1111, boss; 1112, inclined plane 1; 1113, groove; 1114, base; 1115, pulley; 1116, rotating shaft; 1321, limit groove; 1322, inclined plane 2 DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] Please refer to Figure 1-7 ;

[0026] The low-friction mold opening structure of the injection mold of the utility model can control the mold opening sequence of different templates. At the same time, the pulley 1115 can also reduce the friction between the pull rod 111 and the spring block 132, reduce the wear of the pull rod 111 and the spring block 132, extend the service life of the mold opening structure, and reduce maintenance costs.

[0027] Specifically, it includes an upper mold base 1 and a lower mold base 2. The upper mold base 1 includes a panel 11. A stripper plate 12 is arranged below the panel 11. An upper mold plate 13 is arranged below the stripper plate 12. The upper mold base 1 and the lower mold base 2 are combined together and installed on an injection molding machine. The lower mold base 2 is connected to the mold opening device of the injection molding machine.

[0028] In this embodiment, four locking blocks 21 are fixedly installed on the side of the lower mold base 2, and a step 211 is provided at one end of the locking block 21. A pull rod 111 is inserted into the locking block 21, and the pull rod 111 is fixedly installed on the side of the panel 11. A storage groove 134 is opened on the side of the upper mold plate 13, and a spring block 132 is installed in the storage groove 134. A spring 133 is installed between the spring block 132 and the upper mold plate 13, and the spring block 132 can slide in the storage groove 134. The end face abuts against the lower end face of the step 211, and the end of the pull rod 111 is provided with a boss 1111 facing the lower mold base 2, and the side of the boss 1111 facing the spring block 132 is provided with an inclined surface 1112, and a groove 1113 is opened at the inclined surface 1112. A plurality of pulleys 1115 are installed in the groove 1113, and a rotating shaft 1116 is passed through the pulley 1115. The pulley 1115 can abut against the spring block 132, and the rotating shaft 1116 is connected to the side of the groove 1113.

[0029] Specifically, when the mold is opened after injection molding, the mold opening device of the injection molding machine drives the lower mold base 2 to separate from the upper mold base 1, and the spring block 132 on the side of the upper mold base 13 abuts against the step 211 of the locking block 21, and the locking block 21 is connected to the lower mold base 2, and the locking block 21 will move with the lower mold base 2. Because the spring block 132 is stuck in the locking block 21, the upper mold base 13 cannot be separated from the lower mold base 2 temporarily and will move with the lower mold base 2. However, there is no connecting part between the upper mold base 13 and the stripping plate 12 to prevent separation. The upper mold base 13 will separate from the stripping plate 12 first, and the pressure rod installed on the side of the panel 11 remains stationary. When the lower mold base 2 moves to a certain position together with the upper mold base 13, the pulley 1115 installed in the boss 1111 abuts against the spring block 132, and the mold opening device continues to drive the lower mold base 2 to move. The pull rod 111 will not tilt up due to the spring block 132 under the restriction of the locking block 21, but will force the spring block 132 to be gradually pressed down, and the pulley 1115 will roll on the surface of the spring block 132, which greatly reduces the friction between the pull rod 111 and the spring block 132 in the structure, reduces the wear of the pull rod 111 and the spring block 132, extends the service life of the mold opening structure, and reduces the maintenance cost. When the spring block 132 is completely pressed into the receiving groove 134, the spring block 132 is disassociated from the locking block 21, and the lower mold base 2 and the upper mold plate 13 are no longer restricted, and the lower mold base 2 and the upper mold plate 13 are separated. Then the ejector rod of the injection molding machine pushes the ejector plate in the lower mold base 2, and the ejector is pushed out to eject the plastic part. The manipulator installed outside the injection molding machine starts to work and takes out the plastic part in the lower mold base 2.

[0030] In the present embodiment, a slot 114 is provided on the side of the panel 11, and a pull rod 111 fixed by a screw 131 is installed in the slot 114. A slot 22 is provided on the side of the lower mold base 2, and a locking block 21 fixed by a screw 131 is installed in the slot 22. Under the restriction of the slot 114 and the slot 22, the pull rod 111 and the locking block 21 can be prevented from shifting during use, thereby ensuring that the entire mold opening mechanism can be used normally.

[0031] In the present embodiment, a base 1114 is embedded in the groove 1113, and the base 1114 is rotatably connected to the pulley 1115 via a rotating shaft 1116, so that the base 1114 and the pulley 1115 form a whole. After being used for a long time, the pulley 1115 will inevitably be worn or damaged. In this case, the pulley 1115 needs to be replaced. When disassembling, the pulley 1115 is taken out from the groove 1113 together with the base 1114, and then the new pulley 1115 is installed in the groove 1113 together with the base 1114.

[0032] In the present embodiment, a limiting groove 1321 is provided in the middle of the spring block 132, a spring 133 is installed in the limiting groove 1321, a limiting screw 131 is passed through the limiting groove 1321, the limiting screw 131 passes through the spring 133, the spring block 132 is connected to the upper template 13 through the limiting screw 131, and a second inclined surface 1322 is provided on the side of the spring block 132 facing the first inclined surface 1112, and the second inclined surface 1322 can contact with the pulley 1115. Under the restriction of the limiting screw 131, it is ensured that the spring block 132 will not separate from the receiving groove 134 under the action of the spring 133. During the mold opening process, the second inclined surface 1322 contacts with the pulley 1115, which can further reduce the friction between the pressure rod and the spring block 132, so that the spring block 132 can be pressed into the receiving groove 134 more smoothly.

[0033] In this embodiment, an upper mold core 135 is installed in the upper mold plate 13, a lower mold core 23 is installed in the lower mold base 2, two side mold cores 25 are slidably connected to the lower mold core 23, a slide groove 24 for the side mold core 25 to slide is provided on the lower mold base 2, a slider 26 is provided in the slide groove 24, the slider 26 is fixedly connected to the side mold core 25, and a cylinder 27 is fixedly installed on both sides of the lower mold base 2, the output end of the cylinder 27 is fixedly connected to the slider 26, and the cylinder 27 is electrically connected to the controller. According to the shape and structure of the plastic part, in addition to the mold opening direction of the lower mold base 2, two left and right mold opening directions are also designed. First, the molten plastic passes through the mold The injection nozzle is injected into the mold core. After the pressure holding and cooling stages, the mold begins to open. The upper mold core 135 will remain motionless along with the upper mold plate 13. The entire lower mold base 2 is driven by the mold opening device of the injection molding machine. The lower mold core 23 and the two side mold cores 25 move together with the lower mold base 2 and separate from the upper mold core 135. When the lower mold base 2 moves to a sufficient mold opening distance, it stops. The controller starts the cylinder 27. The cylinder 27 pulls the slider 26, together with the side mold core 25 in the slide groove 24, and slides away from the lower mold core 23 in the left and right directions respectively. The lower mold core 23 still stays in the lower mold base 2, realizing the left and right direction opening of the side mold core 25.

[0034] In the present embodiment, flow channels are provided inside the panel 11, the stripping plate 12 and the upper template 13, and a plurality of water inlets 112 and water outlets 113 are respectively provided on the sides of the three and connected to the flow channels. The water inlet 112 and the water outlet 113 are respectively connected to the mold temperature controller outside the mold through water pipes. The mold temperature controller can adjust the temperature of the water inlet and the water outlet, including heating and cooling functions. After the mold injection is completed, the plastic parts in the mold need to be quickly cooled and formed. The mold temperature controller is started to inject low-temperature water into the mold through the water inlet 112. After the water enters, it absorbs the heat of the plastic parts to achieve the purpose of cooling the plastic parts. The water then flows back to the mold temperature controller through the water outlet 113. The heat dissipation components of the mold temperature controller cool the water, so that the water forms a cycle. When the outside temperature is low, the mold needs to be preheated before injection. The mold temperature controller injects the heated water into the mold. After injecting hot water for a period of time, the temperature of the mold can be increased, thereby achieving the purpose of preheating the mold.

[0035] 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.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A low-friction mold opening structure for an injection mold, comprising an upper mold base (1) and a lower mold base (2), characterized in that: The upper die base (1) comprises a panel (11), a stripper plate (12) is arranged below the panel (11), and an upper die plate (13) is arranged below the stripper plate (12); Four locking blocks (21) are fixedly mounted on the side of the lower mold base (2), one end of the locking block (21) is provided with a step (211), a pull rod (111) is passed through the locking block (21), and the pull rod (111) is fixedly mounted on the side of the panel (11), a receiving groove (134) is opened on the side of the upper mold plate (13), a spring block (132) is installed in the receiving groove (134), a spring (133) is installed between the spring block (132) and the upper mold plate (13), and the spring block (132) is provided with a spring. The end face abuts against the lower end face of the step (211); the end of the pull rod (111) is provided with a boss (1111) facing the lower mold base (2); the boss (1111) is provided with an inclined surface (1112) on the side facing the spring block (132); a groove (1113) is provided at the inclined surface (1112); a plurality of pulleys (1115) are installed in the groove (1113); a rotating shaft (1116) is passed through the pulley (1115); and the pulley (1115) can abut against the spring block (132).

2. The low friction mold opening structure of an injection mold according to claim 1, characterized in that: A first card slot (114) is provided on the side of the panel (11), and a pull rod (111) fixed by a screw (131) is installed in the first card slot (114); a second card slot (22) is provided on the side of the lower mold base (2), and a locking block (21) fixed by a screw (131) is installed in the second card slot (22).

3. The low friction mold opening structure of an injection mold according to claim 1, characterized in that: The groove (1113) is embedded with a base (1114), and the base (1114) is rotatably connected to the pulley (1115) via a rotating shaft (1116), so that the base (1114) and the pulley (1115) form a whole.

4. The low friction mold opening structure of an injection mold according to claim 1, characterized in that: A limiting groove (1321) is provided in the middle of the spring block (132), a spring (133) is installed in the limiting groove (1321), a limiting screw (131) is passed through the limiting groove (1321), the limiting screw (131) passes through the spring (133), the spring block (132) is connected to the upper template (13) through the limiting screw (131), and a second inclined surface (1322) is provided on the side of the spring block (132) facing the first inclined surface (1112), and the second inclined surface (1322) can contact the pulley (1115).

5. The low friction mold opening structure of an injection mold according to claim 1, characterized in that: An upper mold core (135) is installed in the upper mold plate (13), a lower mold core (23) is installed in the lower mold base (2), two side mold cores (25) are slidably connected to the lower mold core (23), a slide groove (24) for the side mold cores (25) to slide is provided on the lower mold base (2), a slider (26) is provided in the slide groove (24), the slider (26) is fixedly connected to the side mold core (25), and a cylinder (27) is fixedly installed on the two side surfaces of the lower mold base (2), and the output end of the cylinder (27) is fixedly connected to the slider (26).

6. The low friction mold opening structure of an injection mold according to claim 1, characterized in that: The panel (11), the stripping plate (12) and the upper mold plate (13) are provided with flow channels inside, and the sides of the three are respectively provided with a plurality of water inlets (112) and water outlets (113) which are connected to the flow channels.

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