Mold drawing and pressure supplementing device for injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to an injection mold drawing and pressure supplementing device which comprises an upper mold and a lower mold, a mounting plate is arranged on the lower mold, a stamping component is arranged on the mounting plate, the stamping component is communicated with an internal cavity formed by the upper mold and the lower mold, the stamping component comprises a ball valve fixedly mounted on the mounting plate, and the ball valve is arranged on the mounting plate. A conducting piece is rotationally installed in the ball valve in a sealed mode, a switch structure is arranged on the conducting piece, and the switch structure can switch the conducting piece, so that the conducting or closing state of the ball valve is changed; a pressure sensing assembly is further arranged on the mounting plate and comprises a piston cylinder which is arranged on the mounting plate and communicates with the cavity, a pressure sensing piece is arranged in the piston cylinder, the pressure sensing piece can reflect the pressure intensity state in the cavity, and after the pressure intensity in the cavity reaches a certain value, the pressure sensing piece can sense the pressure in the cavity. The pressure sensing piece can drive a trigger assembly arranged on the mounting plate to close the conduction piece; and through cooperation of all the assemblies, the size precision of the injection molding part can be improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically an injection mold release and pressure compensation device. Background Technology

[0002] Injection molding is a method of industrial product manufacturing, typically using rubber or plastic injection molding. It's a highly efficient plastic processing technology, and its process mainly includes the following key stages: melt storage, injection and filling, holding pressure, cooling, and demolding. The holding pressure stage refers to the continuous application of pressure after filling to compact the melt, increase plastic density, and compensate for shrinkage.

[0003] Currently, the most common method of pressure compensation is mechanical pressure compensation. During the mechanical pressure compensation process, it is necessary to precisely control the pressure and time. If the pressure control is unstable, it will lead to problems such as uneven product density and stress concentration. This requires high technical skills from the operators and the overall operation process is relatively complex. Utility Model Content

[0004] The purpose of this invention is to provide an injection mold release and pressure compensation device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A molding die release and pressure compensation device includes: an upper mold and a lower mold, a mounting plate is provided on the lower mold, a stamping assembly is provided on the mounting plate, the stamping assembly is connected to the internal cavity formed by the upper mold and the lower mold, and includes a ball valve fixedly mounted on the mounting plate, a guide member is rotatably installed inside the ball valve, and a switch structure is provided on the guide member, the switch structure can switch the guide member, thereby changing the on or off state of the ball valve;

[0007] The mounting plate is also provided with a pressure sensing component, which includes a piston cylinder disposed on the mounting plate and communicating with the cavity. A pressure sensing element is disposed inside the piston cylinder. The pressure sensing element can reflect the pressure state inside the cavity, and when the pressure inside the cavity reaches a certain value, the pressure sensing element can drive a triggering component disposed on the mounting plate to close the conductive element.

[0008] As described above, the injection mold release and pressure compensation device includes a valve core that is rotatably and sealed inside the ball valve. The valve core has a vent hole that can connect to the air outlet and air inlet pipes provided on the ball valve.

[0009] The injection mold release and pressure compensation device as described above: the switching structure includes a stabilizing plate disposed on the air outlet pipe, a deflecting plate rotatably mounted on the stabilizing plate, a second protrusion disposed on the deflecting plate, the second protrusion being connected to the first protrusion disposed on the stabilizing plate via a first spring, and the rotation axis of the deflecting plate being connected to the valve core via a linkage structure.

[0010] The injection mold release and pressure compensation device as described above: the linkage structure includes a driving component and a passive component, the driving component including a deflection rod fixedly connected to the rotation axis of the deflection plate.

[0011] As described above, the injection mold release and pressure compensation device includes a fixed plate coaxially arranged with the valve core, a deflection groove on the fixed plate, and a deflection rod inserted into the deflection groove.

[0012] As described above, the injection mold release and pressure compensation device includes a piston rod that is sealed and slidably disposed inside the piston cylinder. A piston disc is coaxially disposed at one end of the piston rod that extends into the piston cylinder, and a second spring is slidably disposed on the piston rod. One end of the second spring abuts against the piston disc, and the other end abuts against the inner wall of the piston cylinder.

[0013] The injection mold release and pressure compensation device as described above: the triggering component includes a guide and a triggering element, the guide includes a guide plate fixedly connected to the piston rod, and the guide plate is provided with an inclined groove.

[0014] As described above, the injection mold release and pressure compensation device includes a lifting rod, which is slidably connected to a fixing member on the mounting plate. The lifting rod is provided with a sliding rod, which is slidably disposed in the inclined groove. The lifting rod is also provided with a moving plate, and the moving plate is provided with a trigger plate. Two sets of trigger plates are symmetrically arranged along the length direction of the moving plate.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] By setting up a pressure-sensing component, the pressure inside the cavity can be detected in real time. At the same time, in conjunction with the trigger component and linkage structure, the opening and closing state of the ball valve can be controlled so that the pressure inside the cavity is always maintained within an appropriate range, thereby preventing the thermoplastic part from shrinking and deforming during the cooling process.

[0017] Meanwhile, during the pressurization process, due to the cooperation of the second spring in the pressure sensing component, when the pressure inside the cavity is about to reach the preset value, the second spring can gradually reduce the pressurization rate so that the pressure value inside the cavity can be controlled more accurately, thereby improving the dimensional accuracy of the injection molded parts. The overall operation is simple and requires no manual intervention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the injection mold release and pressure compensation device.

[0019] Figure 2 This is a schematic diagram of the other side of the injection mold release and pressure compensation device.

[0020] Figure 3 This is a schematic diagram of the structure on the mounting plate in the injection mold release and pressure compensation device.

[0021] Figure 4 This is a schematic diagram of the connection between the switch structure and the valve core in the injection mold release and pressure compensation device.

[0022] Figure 5 This is a schematic diagram of the conductive component in the injection mold release and pressure compensation device.

[0023] Figure 6 This is a schematic diagram of the switch structure in the injection mold release and pressure compensation device.

[0024] Figure 7 This is a schematic diagram of the trigger component in the injection mold release and pressure compensation device.

[0025] Figure 8 This is a schematic diagram of the pressure-sensing component in the injection mold release and pressure compensation device.

[0026] In the diagram: 1. Upper mold; 2. Lower mold; 3. Mounting plate; 301. Fixing component; 4. Guide plate; 401. Inclined groove; 5. Moving plate; 501. Trigger plate; 6. Ball valve; 601. Air outlet pipe; 602. Air inlet pipe; 7. Piston cylinder; 701. Protrusion; 8. Stabilizing plate; 801. First protrusion; 802. Lower baffle plate; 803. Upper baffle plate; 9. Deflection plate; 901. Second protrusion; 902. Deflection rod; 10. First spring; 11. Valve core; 1101. Vent hole; 12. Lifting rod; 1201. Sliding rod; 13. Second spring; 14. Piston rod; 1401. Groove; 15. Fixing plate; 1501. Deflection groove. Detailed Implementation

[0027] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0028] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0029] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0030] Please see Figures 1-8 In this embodiment of the present invention, an injection mold release and pressure compensation device includes: an upper mold 1 and a lower mold 2. The lower mold 2 is provided with a mounting plate 3, and the mounting plate 3 is provided with a stamping assembly. The stamping assembly is connected to the internal cavity formed by the upper mold 1 and the lower mold 2. The device includes a ball valve 6 fixedly installed on the mounting plate 3. A conductive element is rotatably installed inside the ball valve 6. A switch structure is provided on the conductive element. The switch structure can switch the conductive element, thereby changing the on or off state of the ball valve 6.

[0031] The conductive component includes a valve core 11 that is rotatably and sealed inside the ball valve 6. The valve core 11 has a vent hole 1101, which can connect to the air outlet pipe 601 and the air inlet pipe 602 provided on the ball valve 6.

[0032] In particular, please see Figure 4 , Figure 5 The air inlet pipe 602 is connected to the air pump device (not shown in the figure) located outside the lower mold 2. In the initial state, the ball valve 6 is in the open state. When the upper mold 1 and the lower mold 2 are combined, the hot melt injection molding material will be input into the cavity formed by the upper mold 1 and the lower mold 2. After the injection molding is completed, during the cooling process, the air pump device enters the working state. Subsequently, the air pump device will pressurize the cavity through the ball valve 6, thereby effectively controlling the quality of the injection molded product and ensuring its dimensional accuracy.

[0033] It should be noted that a damping sleeve is provided between the valve core 11 and the ball valve 6. The damping sleeve can increase the friction between the ball valve 6 and the valve core 11, so that the valve core 11 can only rotate relative to the ball valve 6 under the action of a certain external force, thereby changing the on or off state of the ball valve 6.

[0034] The switch structure includes a stabilizing plate 8 disposed on the air outlet pipe 601, a deflecting plate 9 rotatably mounted on the stabilizing plate 8, a second protrusion 901 disposed on the deflecting plate 9, the second protrusion 901 being connected to the first protrusion 801 disposed on the stabilizing plate 8 via a first spring 10, and the rotation axis of the deflecting plate 9 being connected to the valve core 11 via a linkage structure.

[0035] The linkage structure includes a driving component and a passive component. The driving component includes a deflection rod 902 that is fixedly connected to the rotation axis of the deflection plate 9.

[0036] The passive component includes a fixed disk 15 coaxially arranged with the valve core 11, a deflection groove 1501 is provided on the fixed disk 15, and the deflection rod 902 is inserted into the deflection groove 1501;

[0037] For details, please refer to Figure 4 , Figure 6 The aforementioned stabilizing plate 8 is provided with an upper baffle 803 and a lower baffle 802. In the initial state, the deflecting plate 9 is in contact with the upper baffle 803, and the first spring 10 is in a stretched state. When the deflecting plate 9 is subjected to external force and deflects towards the lower baffle 802, the stretch of the first spring 10 will gradually increase. The deflecting rod 902 will first rotate in the deflection groove 1501 until the deflecting plate 9 crosses the horizontal plane formed by the stabilizing plate 8 and the deflecting plate 9 (hereinafter referred to as the equilibrium state). The deflecting rod 902 is in contact with the groove wall of the deflection groove 1501. Subsequently, the first spring 10 releases elastic potential energy, which can quickly pull the deflecting plate 9 to continue rotating until the deflecting plate 9 is in contact with the lower baffle 802. At this time, the vent hole 1101 is misaligned with the inlet pipe 602 and the outlet pipe 601, and the ball valve 6 is closed.

[0038] For further details, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 The mounting plate 3 is also provided with a pressure sensing component, which includes a piston cylinder 7 disposed on the mounting plate 3 and communicating with the cavity. The piston cylinder 7 is provided with a pressure sensing element, which can reflect the pressure state in the cavity. When the pressure in the cavity reaches a certain value, the pressure sensing element can drive the triggering component disposed on the mounting plate 3 to close the conductive element.

[0039] The pressure-sensing component includes a piston rod 14 that is slidably and sealed inside the piston cylinder 7. A piston disc is coaxially disposed at one end of the piston rod 14 that extends into the piston cylinder 7. A second spring 13 is also slidably disposed on the piston rod 14. One end of the second spring 13 abuts against the piston disc, and the other end abuts against the inner wall of the piston cylinder 7.

[0040] For details, please refer to Figure 8 The piston rod 14 is provided with a groove 1401 along its axial direction. The groove 1401 cooperates with the protrusion 701 formed on the inner wall of the piston cylinder 7, so that the piston rod 14 can only slide along the axial direction of the piston cylinder 7.

[0041] Specifically, the second spring 13 is always in a compressed and stored energy state. In the initial state, the piston disc is close to the upper mold 1. When the pumping device pressurizes the cavity, the pressure inside the cavity increases, which can squeeze the piston disc, thereby driving the piston rod 14 to gradually move away from the upper mold 1. During this process, the stored elastic potential energy of the second spring 13 gradually increases, and the speed at which the piston rod 14 moves away from the upper mold 1 will gradually decrease. At this time, the pressing rate of the pumping device in the cavity will gradually decrease, which can make the pressing amount in the cavity better controlled. In this process, the triggering component can be triggered until the pressure inside the cavity reaches the preset value (the preset value required for pressure holding). The triggering component can drive the switching structure to operate, thereby closing the ball valve 6.

[0042] For details, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 The triggering component includes a guide and a trigger. The guide includes a guide plate 4 fixedly connected to the piston rod 14. The guide plate 4 has an inclined groove 401.

[0043] The triggering element includes a lifting rod 12, which is slidably connected to a fixing member 301 disposed on the mounting plate 3. The lifting rod 12 is provided with a sliding rod 1201, which is slidably disposed in the inclined groove 401. The lifting rod 12 is also provided with a moving plate 5, and the moving plate 5 is provided with a trigger plate 501. Two sets of trigger plates 501 are symmetrically arranged along the length direction of the moving plate 5.

[0044] In summary, in the initial state, the slide bar 1201 is located at the end of the stroke of the inclined groove 401, as follows: Figure 3 As shown, when the piston rod 14 moves, the contact compression of the inclined groove 401 on the slide rod 1201 forces the slide rod 1201 to move the lifting rod 12 toward the deflection plate 9. During this process, a set of trigger plates 501 near the guide plate 4 gradually approach the deflection plate 9 and contact it. Then, the deflection plate 9 is pushed to deflect clockwise until the filling pressure in the cavity reaches the preset value. The slide rod 1201 moves to the end of the stroke of the inclined groove 401, and the trigger plate 501 pushes the deflection plate 9 past the equilibrium state. Then, the deflection plate 9 quickly deflects on its own, which can close the ball valve 6 so that the air pressure in the cavity is maintained within a certain range, which is convenient for the injection molded part to be cooled and shaped.

[0045] Meanwhile, during the subsequent cooling process, the pressure inside the cavity will decrease. At this time, the second spring 13 can push the piston plate closer to the upper mold 1. During this process, the guide plate 4 can drive the lifting rod 12 to move the moving plate 5 in the opposite direction. When the pressure inside the cavity drops to a certain value, the trigger plate 501 and the deflection plate 9 cooperate to open the ball valve 6 again so that the air pump can replenish the pressure inside the cavity again. After the pressure inside the cavity is replenished to the preset value, the ball valve 6 is closed again. This cycle can keep the pressure inside the cavity within a certain range, ensuring that the material fully fills the cavity after cooling, thereby improving the quality of the injection molded part. The whole process is simple to operate, requires no manual intervention, and has high precision.

[0046] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An injection mold ejection pressure supplementing device characterized by comprising: Include: Upper die (1) and lower die (2), the lower die (2) is provided with mounting plate (3), the mounting plate (3) is provided with stamping assembly, the stamping assembly is communicated with the internal cavity formed by the upper die (1) and lower die (2), including fixedly installed on the mounting plate (3) ball valve (6), the ball valve (6) is sealed and rotatably installed in the guide, the guide is provided with switch structure, the switch structure can switch the guide, so as to change the on or off state of the ball valve (6); The mounting plate (3) is also provided with pressure sensing assembly, the pressure sensing assembly includes piston cylinder (7) arranged on the mounting plate (3) and communicated with the cavity, the piston cylinder (7) is provided with pressure sensing element, the pressure sensing element can reflect the pressure state in the cavity, and when the pressure in the cavity reaches a certain value, the pressure sensing element can drive the trigger assembly arranged on the mounting plate (3) to close the guide.

2. The ejection pressure supplementing device for injection mold according to claim 1, wherein The guide includes valve core (11) sealed and rotatably installed in the ball valve (6), the valve core (11) is provided with air pipe hole (1101), the air pipe hole (1101) can guide the air pipe (601) and air inlet pipe (602) arranged on the ball valve (6).

3. The ejection pressure supplementing device for injection mold according to claim 2, wherein The switch structure includes a stabilizing plate (8) arranged on the air pipe (601), the stabilizing plate (8) is rotatably installed with a deflector plate (9), the deflector plate (9) is provided with a second protruding column (901), the second protruding column (901) is connected with the first protruding column (801) arranged on the stabilizing plate (8) through the first spring (10), and the rotation axis of the deflector plate (9) is connected with the valve core (11) through the linkage structure.

4. The ejection pressure supplementing device for injection mold according to claim 3, wherein The linkage structure includes a driving element and a passive element, the driving element includes a deflector rod (902) fixedly connected with the rotation axis of the deflector plate (9).

5. The ejection pressure supplementing device for injection mold according to claim 4, wherein The passive element includes a fixed disc (15) coaxially arranged with the valve core (11), the fixed disc (15) is provided with a deflection groove (1501), and the deflection rod (902) is inserted into the deflection groove (1501).

6. The ejection pressure supplementing device for injection mold according to claim 2, wherein The pressure sensing element includes a piston rod (14) sealingly and slidingly arranged in the piston cylinder (7), one end of the piston rod (14) coaxially arranged with a piston disc, and the piston rod (14) is also slidingly provided with a second spring (13), one end of the second spring (13) abuts against the piston disc, and the other end abuts against the inner wall of the piston cylinder (7).

7. The ejection pressure supplementing device for injection mold according to claim 6, wherein The trigger assembly includes a guide and a trigger, the guide includes a guide plate (4) fixedly connected with the piston rod (14), and the guide plate (4) is provided with an inclined slot (401).

8. The ejection pressure supplementing device for injection mold according to claim 7, wherein The trigger piece comprises a lifting rod (12) which is in sliding connection with a fixing piece (301) arranged on the mounting plate (3), and a sliding rod (1201) is arranged on the lifting rod (12) and is arranged in sliding mode in the chute (401), and a moving plate (5) is further arranged on the lifting rod (12), and a trigger plate (501) is arranged on the moving plate (5), and two groups of the trigger plate (501) are symmetrically arranged along the length direction of the moving plate (5).

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