Cooling water path system for compression molding

Abstract

The utility model discloses a kind of cooling water path systems for compression molding, including first water supply water path, the both ends of the first water supply water path are respectively connected with water tank, first cooling circuit for connecting mould, the first cooling circuit is connected with heat exchange water path;First water pump, first check valve are provided on the first cooling circuit, the water outlet end of the first water supply water path is between the water inlet end of the first water pump and the water outlet end of the first check valve, and the flow direction allowed by the first check valve is from the water outlet end of the mould to the water inlet end of first water pump, and, first water supply water path is provided with the water supplement pump for applying back pressure to first check valve. The utility model can make cooling water evenly fill the internal water path of mould, to have better cooling effect.

Description

Technical Field

[0001] This utility model relates to the field of compression molding technology, specifically to a cooling water circuit system for compression molding. Background Technology

[0002] With the development of compression molding technology, it is being used more and more widely in the field of simple thin-walled products such as bottle caps. Furthermore, manufacturers are demanding higher and higher production stability and efficiency from compression molding equipment. Stable and efficient water cooling systems have become a limiting factor for improving equipment productivity and shortening product molding cycles.

[0003] The cooling water circuits of compression molding equipment currently on the market, such as Figure 1 As shown, the system includes a water tank 300 and two first cooling circuits 2 connected to the internal water channels of the upper and lower molds of the mold 100, respectively. The water tank 300 is connected to the first cooling circuit 2 via a first water supply channel 1, and the first cooling circuit 2 is connected to a heat exchanger 302. Driven by a first water pump 201, water from the water tank 300 flows into the first cooling circuit 2 through the first water supply channel 1, flows within the first cooling circuit 2, and exchanges heat with the heat exchanger 302 to form cooling water, which can repeatedly cool the mold 100. However, because the first cooling circuit 2 is equipped with a first one-way valve 202 to restrict the direction of water flow, when the cooled water flows from the mold 100 to the first water pump 201, the first one-way valve 202 is easily opened by the water flow. This prevents the cooling water from being evenly filled into the narrow cooling channels inside the mold 100, thus failing to ensure sufficient cooling effect. The consequences include longer production cycles, longer production process adjustment cycles, unstable quality of the bottle caps produced, and product defects.

[0004] Therefore, it is necessary to develop a cooling water system for compression molding to overcome the shortcomings in current practical applications. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model proposes a cooling water system for compression molding, which can make the cooling water evenly fill the internal water channels of the mold, thereby achieving a better cooling effect.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A cooling water circuit system for compression molding includes a first water supply circuit, with a water tank and a first cooling circuit for connecting a mold respectively connected to both ends of the first water supply circuit. The first cooling circuit is connected to a heat exchange water circuit. A first water pump and a first one-way valve are provided on the first cooling circuit. The outlet of the first water supply circuit is located between the inlet of the first water pump and the outlet of the first one-way valve. The flow direction allowed by the first one-way valve is from the outlet of the mold to the inlet of the first water pump. A makeup water pump for applying back pressure to the first one-way valve is provided on the first water supply circuit.

[0008] Preferably, a pressure sensor is also provided on the first water supply line, and both the water replenishment pump and the pressure sensor are electrically connected to a controller.

[0009] Preferably, the first water supply line is further provided with a second one-way valve and a pressure stabilizing tank, wherein the second one-way valve is located between the water supply pump and the pressure sensor, the pressure stabilizing tank is located between the first cooling circuit and the pressure sensor, and the flow direction allowed by the second one-way valve is from the water tank to the first cooling circuit.

[0010] Preferably, it further includes a second cooling circuit for connecting at least one load to be cooled, the second cooling circuit being equipped with a second water pump and connected to the water tank via a second water supply circuit, and the second cooling circuit being connected to a heat exchange water circuit.

[0011] Preferably, the heat exchange water circuit includes a chiller, at least one heat exchanger, and at least one heat exchange loop. The heat exchanger is disposed on a first cooling loop or a second cooling loop and is connected to the chiller through a corresponding heat exchange loop.

[0012] Preferably, a temperature sensing module is provided on both the first cooling circuit and the second cooling circuit, and an electrically controlled valve is provided on each of the heat exchange circuits. The temperature sensing module and the electrically controlled valve are electrically connected to the controller.

[0013] Preferably, filters are provided on both the first cooling circuit and the second cooling circuit.

[0014] Preferably, it also includes a drainage waterway, the two ends of which are connected to the first cooling circuit and the water tank, respectively, and a valve is provided on the drainage waterway.

[0015] Preferably, an exhaust valve is provided at one end of the first cooling circuit near the mold.

[0016] Preferably, there are two first cooling circuits, which are used to connect the upper mold and the lower mold of the mold, respectively.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] This invention incorporates a water replenishment pump in the first water supply line. When water from the tank flows into the first cooling circuit under the suction of the first water pump, circulating within the first cooling circuit to cool the mold, the water replenishment pump obstructs the flow of water in the first cooling circuit. Furthermore, since the outlet of the first water supply line is located between the inlet of the first water pump and the outlet of the first water supply line, back pressure is applied to the first check valve, increasing the difficulty for the check valve to be opened by the water flow. Water is retained between the inlet of the first check valve and the outlet of the first water pump, allowing the water to more evenly fill the internal water channels and narrow cooling holes of the mold, resulting in better cooling and thus effectively improving production efficiency and product quality. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the cooling water circuit for an existing compression molding equipment;

[0021] Figure 2 This is a schematic diagram of the cooling water circuit according to an embodiment of the present invention.

[0022] Figure label:

[0023] Mold-100; Load to be cooled-200; Water tank-300; First water supply circuit-1, water replenishment pump-101, pressure sensor-102, second check valve-103, pressure stabilizing tank-104; First cooling circuit-2, first water pump-201, first check valve-202; Heat exchange circuit-3, chiller-301, heat exchanger-302, heat exchange circuit-303; Second cooling circuit-4, second water pump-401; Second water supply circuit-5; Temperature sensing module-6; Electrically controlled valve-7; Filter-8; Drainage circuit-9; Valve-10; Exhaust valve-11; Pressure gauge-12; Flow meter-13. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Reference Figures 1-2

[0028] A cooling water circuit system for compression molding includes a first water supply circuit 1, with a water tank 300 and a first cooling circuit 2 for connecting a mold 100 respectively connected to both ends of the first water supply circuit 1. The first cooling circuit 2 is connected to a heat exchange water circuit 3. A first water pump 201 and a first one-way valve 202 are provided on the first cooling circuit 2. The outlet of the first water supply circuit 1 is located between the inlet of the first water pump 201 and the outlet of the first one-way valve 202. The flow direction allowed by the first one-way valve 202 is from the outlet of the mold 100 to the inlet of the first water pump 201. A makeup water pump 101 for applying back pressure to the first one-way valve 202 is provided on the first water supply circuit 1.

[0029] During the cooling process of the mold 100, the first water pump 201 draws water from the water tank 300 into the first cooling circuit 2 through the first water supply circuit 1. After heat exchange in the heat exchange circuit 3 to form cooling water, the water flows into the internal water circuit of the mold 100, thereby cooling the mold 100. At this time, because the preset pressure of the first one-way valve 202 is relatively small, the water flowing out of the outlet of the mold 100 after cooling the mold 100 easily opens the first one-way valve 202 and flows back to the first water pump 201, allowing the water to circulate in the first cooling circuit 2, thereby repeatedly cooling the mold 100. During the above process, the water pump 101 again sends water from the water tank 300 into the first cooling circuit 2 through the first water supply circuit 1. The additional water will cool the first cooling circuit 2. The flow of water is obstructed. In particular, since the outlet of the first water supply circuit 1 is located between the inlet of the first water pump 201 and the outlet of the first check valve 202, the flow of water between the outlet of the first water supply circuit 1 and the first check valve 202 is particularly obstructed. This, in turn, applies back pressure to the first check valve 202. This back pressure can be adjusted by adjusting the output pressure of the water supply pump 101, thereby effectively preventing the first check valve 202 from being opened by the backflow of water after being cooled down. This allows more water to be retained between the inlet of the first check valve 202 and the outlet of the first water pump 201. The cooling water can better and more evenly fill the internal water channels and narrow cooling holes of the mold 100, thereby achieving a better cooling effect and effectively improving production efficiency and product quality.

[0030] In this specific embodiment, there are two first cooling circuits 2, which are used to connect the upper mold and the lower mold of the mold 100 respectively, so that the upper and lower molds of the mold 100 can be cooled independently; correspondingly, the first water supply circuit 1 has two water outlets, which are connected to the two first cooling circuits 2 respectively.

[0031] In a preferred embodiment, a pressure sensor 102 is also provided on the first water supply circuit 1, and both the water replenishment pump 101 and the pressure sensor 102 are electrically connected to a controller.

[0032] The pressure sensor 102 monitors the water pressure in the first water supply circuit 1 in real time. During the process of replenishing water to the first cooling circuit 2 through the water replenishment pump 101, the water replenishment pump 101 drives the water in the water tank 300 to be sent into the first cooling circuit 2 at a preset pressure (such as 2-3 bar). The water volume and water pressure in the first cooling circuit 2 gradually increase. Since the first water supply circuit 1 is connected to the first cooling circuit 2, when the water in the first cooling circuit 2 is full, the water pressure will be transmitted to the pressure sensor 102 through the first water supply circuit 1. When the water pressure monitored by the pressure sensor 102 reaches the preset water pressure, the controller controls the water replenishment pump 101 to stop running, forming a closed-loop pressure control, which can prevent the water volume and water pressure in the first cooling circuit 2 from exceeding the safety value, thereby causing problems such as water leakage or even equipment damage. Furthermore, when the water in the first cooling circuit 2 decreases due to leakage or other factors, causing the water pressure monitored by the pressure sensor 102 to be lower than the preset range, the controller controls the water replenishment pump 101 to run to replenish water to the first cooling circuit 2.

[0033] Compared to directly increasing the preset opening pressure of the first check valve 202, the above design uses a water supply pump 101 to supply water, which can temporarily increase the opening pressure of the first check valve 202, making the pressure more controllable, reducing the elastic fatigue of the first check valve 202, extending the service life of the first check valve 202, and reducing the possibility of water leakage under long-term high pressure.

[0034] In a preferred embodiment, the first water supply circuit 1 is further equipped with a second one-way valve 103 and a pressure stabilizing tank 104. The second one-way valve 103 is located between the water supply pump 101 and the pressure sensor 102, and the pressure stabilizing tank 104 is located between the first cooling circuit 2 and the pressure sensor 102. The second one-way valve 103 allows flow from the water tank 300 to the first cooling circuit 2. The pressure stabilizing tank 104 improves the stability of the water flow in the first water supply circuit 1, thereby effectively improving the measurement accuracy of the pressure sensor 102. The second one-way valve 103 prevents water in the first cooling circuit 2 from flowing back into the water tank 300.

[0035] In a preferred embodiment, a second cooling circuit 4 is further included for connecting at least one load 200 to be cooled. The second cooling circuit 4 is equipped with a second water pump 401 and is connected to the water tank 300 via a second water supply line 5. Furthermore, the second cooling circuit 4 is connected to a heat exchange water line 3. The load 200 to be cooled is equipment requiring cooling during compression molding, such as an extruder, electrical box, or hydraulic station. Connecting it to the heat exchange water line 3 via the second cooling circuit 4 allows for cooling of the load 200 through heat exchange, providing better controllability and reducing condensation issues caused by directly connecting the chiller 301 to the load 200 via a water line in the prior art, thereby effectively ensuring equipment safety.

[0036] In a preferred embodiment, the first water pump 201, the makeup water pump 101, and the second water pump 401 are all centrifugal pumps. It is understood that the first water pump 201, the makeup water pump 101, and the second water pump 401 can also be other pumps, such as plunger pumps or diaphragm pumps.

[0037] In a preferred embodiment, the heat exchange water circuit 3 includes a chiller 301, at least one heat exchanger 302, and at least one heat exchange loop 303. The heat exchanger 302 is disposed on the first cooling loop 2 or the second cooling loop 4 and is connected to the chiller 301 through the corresponding heat exchange loop 303. The chilled water in the chiller 301 circulates in the heat exchange loop 303 and flows through the heat exchanger 302, thereby exchanging heat with the water in the first cooling loop 2 and / or the second cooling loop 4, cooling the water in the first cooling loop 2 and / or the second cooling loop 4 to form cooling water, which then cools the mold 100 and / or the load 200 to be cooled.

[0038] As an optional embodiment, the number of heat exchange circuits 303 is three, corresponding to two first cooling circuits 2 and two second cooling circuits 4 respectively. Correspondingly, the number of heat exchangers 302 is three, so that heat exchange can be performed on the upper and lower molds of the mold 100 and the load 200 to be cooled respectively.

[0039] In a preferred embodiment, both the first cooling circuit 2 and the second cooling circuit 4 are equipped with temperature sensing modules 6, and each heat exchange circuit 303 is equipped with an electrically controlled valve 7. The temperature sensing modules 6 and the electrically controlled valves 7 are electrically connected to the controller. The temperature sensing modules 106 and 206 are resistance temperature detectors (RTDs) used to monitor the water temperature after heat exchange in the first cooling circuit 2 and the second cooling circuit 4 via the heat exchanger 302 and feed it back to the controller. Based on the feedback water temperature, the controller adjusts the flow rate or even switches the circuit on and off via the electrically controlled valves 7, thereby regulating the water temperature in the first cooling circuit 2 and the second cooling circuit 4.

[0040] In a preferred embodiment, the water tank 300 is an open-type water tank, and filters 8 are installed on both the first cooling circuit 2 and the second cooling circuit 4. Open-type water tanks are low in cost, but they are open to the atmosphere and easily subject to external pollution. Therefore, by installing filters 8 on the first cooling circuit 2 and the second cooling circuit 4, impurities in the water can be effectively filtered out.

[0041] As an optional embodiment, a pressure sensor 102 is also provided on the second cooling circuit 4 to monitor the outlet water pressure of the second water pump 401 and feed it back to the controller.

[0042] As an optional embodiment, a pressure gauge 12 and a flow meter 13 are provided on the first cooling circuit 2. The flow meter 13 is electrically connected to the controller and is used to monitor the water flow rate of the first water pump 201 and feed it back to the controller; the pressure gauge 12 is used to visually view the water pressure.

[0043] In a preferred embodiment, this embodiment further includes a drainage water passage 9, the two ends of which are connected to the first cooling circuit 2 and the water tank 300, respectively. A valve 10 is installed on the drainage water passage 9. During the process of water circulating in the first cooling circuit 2 to cool the mold 100, the valve 10 is in a closed state to prevent water from flowing back into the water tank 300 from the drainage water passage 9. Opening the valve 10 allows water to be drained from the first cooling circuit 2 and the mold 100, preventing corrosion and rust problems caused by water remaining in the equipment for extended periods during shutdown.

[0044] As an optional embodiment, valves 10 are also provided on the first water supply circuit 1, the second water supply circuit 5, and the heat exchange circuit 303. The valves 10 are manual valves, such as manual ball valves, as backup control means in emergency situations such as power outages.

[0045] In a preferred embodiment, an exhaust valve 11 is provided at one end of the first cooling circuit 2 near the mold 100. During the water replenishment process by the water replenishment pump 101, the gas in the water channel inside the mold 100 is squeezed out and discharged from the exhaust valve 11, further making the water evenly fill the water channel inside the mold 100.

[0046] Working principle of this utility model:

[0047] In operation, the first water pump 201 draws water from the water tank 300 into the first cooling circuit 2 via the first water supply circuit 1. Simultaneously, chilled water from the chiller 301 circulates in the heat exchange circuit 303 and flows through the heat exchanger 302, exchanging heat with the water in the first cooling circuit 2. This cools the water in the first cooling circuit 2, forming cooling water that flows into the internal water passages of the mold 100 to cool it. Water flowing from the outlet of the mold 100 opens the first one-way valve 202 and flows back to the first water pump 201, thus circulating the water in the first cooling circuit 2 and repeatedly cooling the mold 100. Furthermore, the pressure sensor 102 monitors the water pressure in the first water supply circuit 1 in real time. If the monitored water pressure is lower than the preset water pressure, it sends feedback information to the controller. The water supply pump 101 additionally replenishes the water in the water tank 300 into the first cooling circuit 2. The replenished water obstructs the flow of water in the first cooling circuit 2, thereby applying back pressure to the first one-way valve 202. This effectively prevents the first one-way valve 202 from being opened by the backflowing water, causing more water to be retained between the inlet end of the first one-way valve 202 and the outlet end of the first water pump 201. This continues until the water pressure at the inlet end of the first one-way valve 202 exceeds the sum of the elasticity of the first one-way valve 202 itself and the water pressure applied by the water supply pump 101. When the first one-way valve 202 is opened and can circulate in the first water supply circuit 1, the force of the first one-way valve 202 being opened is transmitted to the pressure sensor 102 through the water. The pressure sensor 102 feeds back information to the controller, and the water supply pump 101 stops replenishing water. Therefore, this invention enables water to fill the internal water channels and narrow cooling holes of the mold 100 more evenly, thereby achieving a better cooling effect and effectively improving production efficiency and product quality.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cooling water system for compression molding, comprising a first water supply circuit (1), wherein a water tank (300) and a first cooling circuit (2) for connecting a mold (100) are respectively connected to both ends of the first water supply circuit (1); the first cooling circuit (2) is connected to a heat exchange water circuit (3); characterized in that: The first cooling circuit (2) is provided with a first water pump (201) and a first check valve (202). The outlet of the first water supply circuit (1) is located between the inlet of the first water pump (201) and the outlet of the first check valve (202). The flow direction allowed by the first check valve (202) is from the outlet of the mold (100) to the inlet of the first water pump (201). The first water supply circuit (1) is provided with a water replenishment pump (101) for applying back pressure to the first check valve (202).

2. The cooling water path system for compression molding according to claim 1, wherein: A pressure sensor (102) is also installed on the first water supply circuit (1), and the water replenishment pump (101) and the pressure sensor (102) are both electrically connected to a controller.

3. The cooling water path system for compression molding according to claim 2, wherein: The first water supply circuit (1) is also equipped with a second one-way valve (103) and a pressure stabilizing tank (104). The second one-way valve (103) is located between the water supply pump (101) and the pressure sensor (102). The pressure stabilizing tank (104) is located between the first cooling circuit (2) and the pressure sensor (102). The second one-way valve (103) allows the flow direction to be from the water tank (300) to the first cooling circuit (2).

4. A cooling water path system for compression molding according to any one of claims 1 to 3, characterized in that: It also includes a second cooling circuit (4) for connecting at least one load (200) to be cooled, the second cooling circuit (4) is provided with a second water pump (401) and the second cooling circuit (4) is connected to the water tank (300) through a second water supply circuit (5), and the second cooling circuit (4) is connected to the heat exchange water circuit (3).

5. The cooling water path system for compression molding according to claim 4, wherein: The heat exchange water circuit (3) includes a chiller (301), at least one heat exchanger (302), and at least one heat exchange loop (303). The heat exchanger (302) is installed on the first cooling loop (2) or the second cooling loop (4) and is connected to the chiller (301) through the corresponding heat exchange loop (303).

6. The cooling water path system for compression molding according to claim 5, wherein: Temperature sensing modules (6) are provided on the first cooling circuit (2) and the second cooling circuit (4), and an electric control valve (7) is provided on each heat exchange circuit (303). The temperature sensing modules (6) and the electric control valves (7) are electrically connected to the controller.

7. The cooling water path system for compression molding according to claim 4, wherein: Both the first cooling circuit (2) and the second cooling circuit (4) are equipped with filters (8).

8. A cooling water path system for compression molding according to any one of claims 1 to 3, characterized by: It also includes a drainage waterway (9), the two ends of which are connected to the first cooling circuit (2) and the water tank (300) respectively, and a valve (10) is provided on the drainage waterway (9).

9. A cooling water path system for compression molding according to any one of claims 1 to 3, characterized by: An exhaust valve (11) is provided at one end of the first cooling circuit (2) near the mold (100).

10. A cooling water path system for compression molding according to any one of claims 1 to 3, characterized by: The first cooling circuit (2) consists of two circuits, which are used to connect the upper mold and the lower mold of the mold (100) respectively.

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