Synchronous blowing control device for injection molding machine

Abstract

The utility model relates to a synchronous blowing control device for injection molding machine relates to the field of plastics machinery, it includes gas source unit for providing external high pressure gas source, main gas path, upstream with gas source unit connection, first branch, one end is connected in main gas path downstream, the number several, control assembly, one correspondence is established in first branch other end, is used for controlling the gas flow of first branch to blow to the mold, its characterized in that: still include: pilot gas path, upstream with gas source unit connection, downstream is equipped with with each control assembly's switch one -to -one connection's second branch, under the state that pilot gas path is on, control assembly opens to make first branch on. The utility model has realized the effect that the synchronous blowing and exhaust control of multiple control assemblies.

Description

Technical Field

[0001] This utility model relates to the field of plastic machinery, and in particular to a synchronous air blowing control device for injection molding machines. Background Technology

[0002] In the field of machinery manufacturing, injection molding machines play a crucial role in transforming plastic granules into precision plastic parts, serving as the core equipment connecting materials and end products.

[0003] In related technologies, refer to Figure 1 When injection molding machines are used in the LED bulb industry, the production process requires high-pressure air to blow the bulbs. During blowing, four normally closed valves are energized simultaneously, and the high-pressure air enters the mold through the normally closed valves. The four normally open valves on the right are energized and closed. During exhaust, the four normally open valves are de-energized simultaneously, and the high-pressure air is discharged through the silencer of the normally open valve on the right, thus completing the blowing and exhaust actions.

[0004] Regarding the aforementioned technologies, during the blowing and exhausting processes, it is necessary to control 4 normally closed valves and 4 normally open valves, which is a large number and makes it difficult to achieve synchronized valve control. This results in uneven blowing volume control and a low product qualification rate, indicating room for improvement. Utility Model Content

[0005] To address the synchronization issue in valve control, this invention provides a synchronous air blowing control device for injection molding machines.

[0006] This utility model provides a synchronous air blowing control device for injection molding machines, which adopts the following technical solution: A synchronous air blowing control device for an injection molding machine, comprising: The gas supply unit is used to provide an external gas source; The main gas path is connected upstream to the gas source unit; The first branch, one end of which is connected downstream of the main gas line, has several branches; Control components, each corresponding to one of the other ends of the first branch, are used to control the gas flow in the first branch to blow air onto the mold; characterized in that: it further includes: The pilot gas path is connected upstream to the main gas path and downstream to a second branch that is connected to the switches of each of the control components. When the pilot gas path is open, the control components are turned on to make the first branch open.

[0007] By adopting the above technical solution, when the pilot gas path is open, the downstream second branch synchronously transmits gas pressure to the switches of each control component, causing all control components to open simultaneously. This design ensures that the high-pressure gas in the first branch can enter the mold at a balanced pressure through the control components, avoiding problems of insufficient or excessive local blowing volume caused by valve opening time differences. Compared with the traditional solution that requires controlling multiple independent valves separately, this significantly improves the synchronization and stability of the blowing process.

[0008] Optionally, the pilot gas path includes a pilot valve for receiving gas from the main gas path, the pilot valve controlling the gas pressure flowing into the second branch.

[0009] By adopting the above technical solution, the pilot valve can precisely regulate the gas pressure entering the second branch, ensuring that all control components operate synchronously under the same pressure conditions. This pressure regulation mechanism not only improves the consistency of valve opening but also further optimizes the stability of the blowing process by preventing control deviations caused by pressure fluctuations.

[0010] Optionally, a pressure stabilizing unit is also provided between the main air passage and the air source unit.

[0011] By adopting the above technical solution, the pressure stabilizing unit can effectively buffer pressure fluctuations in the gas source unit, ensuring that the gas pressure in the main gas path is always maintained within the stable range required by the process. This design not only avoids malfunctions of the control components caused by sudden pressure changes, but also significantly improves the consistency of bubble size and surface quality during injection molding by maintaining a constant blowing pressure.

[0012] Optionally, the pressure stabilizing unit includes a pressure reducing valve, which is used to control the gas pressure flowing from the gas source unit to the main gas path.

[0013] By adopting the above technical solution, the pressure reducing valve can accurately set the working pressure of the main gas path according to process requirements and maintain pressure stability through automatic adjustment. When the output pressure of the gas source unit exceeds the set value, the pressure reducing valve will automatically reduce its opening to limit the gas flow; when the output pressure is lower than the set value, it will increase its opening to supplement gas. This dynamic adjustment mechanism ensures that the pressure of the main gas path is always within the optimal process window.

[0014] Optionally, the control component includes a first two-position two-way valve whose air inlet is connected to the first branch, and whose air outlet is connected to the mold.

[0015] By adopting the above technical solution, the first and second position two-way valve, as the core actuator of the control component, ensures that the pilot gas path conduction signal can be instantly converted into valve opening action due to its rapid response characteristics. This straight-through structural design eliminates the signal attenuation problem in traditional multi-stage control, allowing high-pressure gas to enter the mold cavity through the shortest path, significantly improving blowing efficiency.

[0016] Optionally, it also includes exhaust branches for venting from the mold, each exhaust branch being connected to a control component. When the control component is closed, the exhaust branches are open to vent from the mold.

[0017] By adopting the above technical solution, when the control component cuts off the gas supply to the first branch, the residual gas in the mold can be quickly discharged through the exhaust branch. The linkage design between the exhaust branch and the control component avoids the complexity of separately controlling the exhaust valve and the blowing valve in traditional solutions, and shortens the air exchange cycle of the mold cavity through synchronous exhaust, providing a more efficient pneumatic control solution for continuous injection molding production.

[0018] Optionally, the control component includes a second two-position two-way valve whose air inlet is connected to the mold via the exhaust branch.

[0019] By adopting the above technical solution, the second two-position two-way valve achieves integrated control of air blowing and air exhaust functions through a unique structural design. When the pilot air path is open, the valve automatically switches to the air intake mode, allowing high-pressure gas to enter the mold through the first branch; while during the control component shutdown phase, the valve switches in reverse to the exhaust mode, efficiently discharging the gas inside the mold through the exhaust branch.

[0020] Optionally, the outlet of the second two-position two-way valve is equipped with a silencer.

[0021] By adopting the above technical solution, the silencer effectively reduces the noise generated during the exhaust of the second two-position two-way valve, creating a quieter working environment for operators. Reduced noise interference improves communication efficiency on the production floor, thereby ensuring the continuity and stability of the injection molding production process.

[0022] Optionally, a third branch for venting from the mold is also included. The control assembly includes a two-position three-way valve, the common port of which is connected to the mold via the third branch, and the air inlet is connected to the first branch.

[0023] By adopting the above technical solution, the two-position three-way valve, through its unique three-port structure, achieves integrated control of air blowing, pressure holding, and exhaust functions. When the pilot air path is open, high-pressure gas enters the inlet of the two-position three-way valve through the first branch and is delivered to the mold cavity through the common port. During the pressure holding stage, the valve can cut off the air inlet path and maintain the common port closed. When exhaust is required, the gas is discharged in reverse through the outlet via the third branch. This multi-functional integrated design not only simplifies the air path layout but also realizes pneumatic switching of each stage within the injection molding cycle through single-valve control, significantly improving the automation level of the production process.

[0024] Optionally, the outlet of the two-position three-way valve is equipped with a silencer.

[0025] By adopting the above technical solution, the silencer configuration effectively suppresses the high-frequency noise generated during the exhaust process of the two-position three-way valve. Its porous sound-absorbing structure achieves noise reduction by converting sound wave energy into heat energy. This design not only reduces the equipment operating noise level to below environmental protection standards, but also avoids long-term noise exposure damage to the operator's hearing.

[0026] In summary, this utility model has at least one of the following beneficial technical effects: The design of the pilot valve and pilot air path simplifies the control logic and reduces the problem of uneven air volume caused by inconsistent valve action. An exhaust branch and a second branch are provided. The exhaust branch is used to transmit gas to the control components, and the second branch is used to synchronously transmit control air pressure to each control component, so as to realize the synchronous action of the valves. This enables more flexible blowing and exhaust control and improves the gas utilization efficiency. By setting up a pressure reducing valve and a pilot valve, the device is effectively protected from damage by excessive air pressure, which enhances the safety and stability of the device. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a synchronous air blowing control device for injection molding machines in related technologies; Figure 2 This is a schematic diagram of a synchronous air blowing control device for an injection molding machine according to Embodiment 1 of this application; Figure 3 This is a schematic diagram of a synchronous blowing control device for an injection molding machine according to Embodiment 2 of this application.

[0028] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Air source unit; 2. Main air path; 3. First branch; 4. Control component; 41. First two-position two-way valve; 42. Second two-position two-way valve; 43. Two-position three-way valve; 5. Pilot air path; 51. Pilot valve; 6. Second branch; 7. Pressure reducing valve; 8. Exhaust branch; 9. Third branch; 10. Silencer. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] This utility model discloses a synchronous air blowing control device for injection molding machines.

[0031] Example 1 Reference Figure 2 A synchronous blowing control device for an injection molding machine includes an air source unit 1, a main air path 2, a pilot air path 5, and a control component 4.

[0032] Air source unit 1 is the starting point of the synchronous blowing control device for the injection molding machine. Air source unit 1 is responsible for connecting to an externally supplied high-pressure air source and is used to connect to a high-pressure air pipe provided by an external air pump or compressor. One end of the main air path 2 is connected to air source unit 1. The main air path 2 is used to transport high-pressure gas from air source unit 1 to other parts of the device. The design of the main air path 2 ensures stable and efficient gas delivery. A first branch path 3 is also connected to the main air path 2. The end of each first branch path 3 furthest from the main air path 2 is a blowing port, directly connected to the control component 4. The first branch path 3 is used to transmit gas from the main air path 2 to the control component 4.

[0033] Pilot gas path 5 is connected to main gas path 2, and pilot gas path 5 is provided with several second branches 6. The end of each second branch 6 away from pilot gas path 5 is connected to a switch of control component 4 in a corresponding manner to transmit control gas to control component 4 to drive control component 4 to work.

[0034] The control component 4 includes a first two-position two-way valve 41 and a second two-position two-way valve 42. The first branch 3, near the air inlet, is connected to the first two-position two-way valve 41. An exhaust branch 8 is installed at the outlet of the first two-position two-way valve 41 and the inlet of the second two-position two-way valve 42. The first two-position two-way valve 41 and the second two-position two-way valve 42 are connected through the exhaust branch 8. The exhaust branch 8 guides the gas from the outlet of the first two-position two-way valve 41 into the mold, realizing the air blowing function. A silencer 10 is provided at the outlet of the second two-position two-way valve 42 to reduce exhaust noise.

[0035] A pressure reducing valve 7 is also installed on the main air passage 2. The pressure reducing valve 7 is installed between the end of the main air passage 2 near the air source unit 1 and the end of the pilot air passage 5 near the main air passage 2. The pressure reducing valve 7 is used to control the air pressure in the main air passage 2 to not exceed the preset main air passage air pressure safety value, so as to prevent excessive air pressure from damaging the control component 4.

[0036] A pilot valve 51 is also installed on the pilot air path 5. The pilot valve 51 is a pilot control valve. The pilot valve 51 is installed between the end of the pilot air path 5 that is close to the main air path 2 and the end of the second branch 6 that is far away from the control component 4. The pilot valve 51 is used to control the air pressure in the pilot air path 5 to not exceed the preset pilot air path air pressure safety value, so as to prevent excessive air pressure from damaging the control end of the control component 4.

[0037] The working principle of Example 1 is as follows: When the gas source unit 1 transmits high-pressure gas to the main gas path 2, the gas is reduced to the safe pressure value of the main gas path through the pressure reducing valve 7. When the gas pressure reaches the safe pressure value of the main gas path, the pressure reducing valve 7 opens, guiding the gas from the main gas path 2 to the pilot gas path 5 and the first branch 3. When the gas is transmitted to the pilot gas path 5, the pilot valve 51 opens, reducing the gas pressure to the safe pressure value of the pilot gas path. When the gas reaches the second branch 6 through the pilot valve 51, it is transmitted to the corresponding first two-position two-way valve 41 and the second branch 3 through the second branch 6. The control terminal of the two-position two-way valve 42 receives air pressure and pushes the valve core to move, changing the opening and closing states of the first two-position two-way valve 41 and the second two-position two-way valve 42. This opens the first two-position two-way valve 41 connected to the second branch 6, allowing gas from the first branch 3 to flow to the first two-position two-way valve 41, and closes the second two-position two-way valve 42 to prevent gas from flowing out. At this time, the gas is transmitted from the exhaust branch 8 to the mold, realizing the blowing of air into the mold. Since all control components 4 receive synchronous control air pressure through the second branch 6, synchronous blowing can be achieved. When the air source unit 1 stops transmitting gas, the valve cores of the first two-position two-way valve 41 and the second two-position two-way valve 42 return to their initial positions under the action of spring force, realizing the exhaust action. The gas is transmitted from the exhaust port of the second two-position two-way valve 42 and the noise is reduced by the silencer 10.

[0038] Example 2 Reference Figure 3The difference between this embodiment and embodiment 1 is that the control component 4 is a two-position three-way valve 43. The air inlet and common port of the two-position three-way valve 43 are normally closed, and the exhaust port is normally open. The two-position three-way valve 43 integrates the functions of the first two-position two-way valve 41 and the second two-position two-way valve 42. The control end of the two-position three-way valve 43 is connected to the end of the second branch 6 away from the pilot valve 51. The air blowing port of the two-position three-way valve 43 is connected to the third branch 9. The third branch 9 is connected to the mold. The exhaust port of the two-position three-way valve 43 is equipped with a silencer 10. When the gas comes to the second branch 6 through the pilot valve 51, the gas is transmitted from the pilot valve 51 to the control end of the two-position three-way valve 43 to drive the valve core of the two-position three-way valve 43 to move, thereby changing the on / off state of the two-position three-way valve 43. When the valve core of the two-position three-way valve 43 moves to the open position, the gas enters the mold from the air inlet through the common port and the third branch 9 to realize the blowing action. Since all two-position three-way valves 43 are connected to the second branch 6, all two-position three-way valves 43 can be opened synchronously to achieve synchronous blowing action. When the air source unit 1 stops transmitting gas, the valve core of the two-position three-way valve 43 returns to the closed position under the action of spring force to achieve exhaust action and reduce noise through the muffler 10.

[0039] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A synchronous air blowing control device for an injection molding machine, comprising: Gas source unit (1) is used to provide an external gas source; The main gas path (2) is connected upstream to the gas source unit; The first branch (3) is connected at one end to the downstream of the main gas path (2), and there are several of them; Control components (4), each corresponding to the other end of the first branch (3), are used to control the gas flow of the first branch (3) to blow air into the mold; characterized in that: it further includes: The pilot gas path (5) is connected upstream to the main gas path (2) and downstream is provided with a second branch (6) that is connected one by one to the switches of each of the control components (4). When the pilot gas path (5) is open, the control component (4) is turned on so that the first branch (3) is open.

2. The synchronous air blowing control device for an injection molding machine according to claim 1, characterized in that: The pilot gas path (5) includes a pilot valve (51) for receiving gas from the main gas path (2), and the pilot valve (51) controls the gas pressure flowing into the second branch (6).

3. The synchronous air blowing control device for an injection molding machine according to claim 2, characterized in that: A pressure stabilizing unit is also provided between the main gas passage (2) and the gas source unit (1).

4. The synchronous air blowing control device for an injection molding machine according to claim 3, characterized in that: The pressure stabilizing unit includes a pressure reducing valve (7), which is used to control the gas pressure flowing from the gas source unit (1) to the main gas path (2).

5. The synchronous air blowing control device for an injection molding machine according to claim 1, characterized in that: The control component (4) includes a first two-position two-way valve (41) whose air inlet is connected to the first branch (3), and whose air outlet is connected to the mold.

6. The synchronous air blowing control device for an injection molding machine according to claim 1, characterized in that: It also includes exhaust branches (8) for venting from the mold, each of which is connected to the control component (4) in a one-to-one manner. When the control component (4) is closed, the exhaust branches (8) are open to vent from the mold.

7. A synchronous air blowing control device for an injection molding machine according to claim 6, characterized in that: The control component (4) includes a second two-position two-way valve (42) whose air inlet is connected to the mold through the exhaust branch (8).

8. The synchronous air blowing control device for an injection molding machine according to claim 7, characterized in that: The outlet of the second two-way valve (42) is equipped with a silencer (10).

9. A synchronous air blowing control device for an injection molding machine according to claim 1, characterized in that: It also includes a third branch (9) for venting from the mold, the control component (4) including a two-position three-way valve (43), the common port of the two-position three-way valve (43) being connected to the mold through the third branch (9), and the air inlet being connected to the first branch (3).

10. A synchronous air blowing control device for an injection molding machine according to claim 9, characterized in that: The outlet of the two-position three-way valve (43) is equipped with a silencer (10).

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