A foaming machine hydraulic station

Abstract

The utility model discloses a foaming machine hydraulic station belongs to hydraulic station technical field, and this hydraulic station works in cooperation through variable plunger pump, pump export pressure regulating valve block, high pressure double -barrel filter, energy accumulator and safety valve group, temperature control loop etc. Module, wherein variable plunger pump realizes pressure self -adaptation adjustment, guarantees oil clean through multistage filtration system, with the help of energy accumulator stable pressure and absorption impact, rely on temperature control loop maintains oil suitable temperature, and cooperate PLC and realize automation control. Its solved the traditional hydraulic station pressure fluctuation, energy consumption, maintenance frequently etc. Problem, with pressure stability, energy -conserving, oil cleanliness is high, continuous production capacity is strong, and the beneficial effect that maintenance is convenient, is applicable to the continuous production scene of foaming machine.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic station technology, specifically a hydraulic station for a foaming machine. Background Technology

[0002] In the production of foaming machines in the plastics machinery industry, the hydraulic station is the core power source, and its performance directly determines the product molding quality and production efficiency. Existing foaming machine hydraulic stations have the following technical defects:

[0003] Insufficient pressure control precision: Single-stage relief valves are often used to regulate pressure, resulting in large pressure fluctuations in the system, which leads to poor mold locking, uneven material injection, and low product qualification rate.

[0004] Oil cleanliness is difficult to maintain: most filters are single-cylinder filters, and the machine needs to be stopped when the filter element is replaced. Moreover, the entire process is not purified. Precision components are frequently worn due to impurities, resulting in a shortened service life.

[0005] Poor continuous production capacity: lack of a sound temperature control, liquid level and overpressure protection mechanism, excessively high oil temperature can easily lead to a decrease in oil viscosity and an increase in leakage.

[0006] To address the aforementioned shortcomings, a hydraulic station for foaming machines needs to be designed that combines precise pressure control, energy saving and consumption reduction, full-process purification, and reliable protection to solve the pain points of existing technologies. Utility Model Content

[0007] In view of the problems existing in the prior art, this utility model provides a hydraulic station for a foaming machine. By optimizing the structure and parameters of the power source, pressure control, filtration, temperature control and pressure stabilization module, it achieves the technical goals of "stable pressure, reduced energy consumption, clean oil and continuous production", thereby improving the production efficiency and product quality of the foaming machine.

[0008] A hydraulic station for a foaming machine, comprising:

[0009] Oil tank, used to store hydraulic oil;

[0010] A variable displacement piston pump, connected to the oil tank, is used to pressurize and output hydraulic oil;

[0011] The pump outlet pressure regulating valve block is connected to the oil outlet of the variable piston pump and is used to control the working pressure of the hydraulic system and provide overpressure protection.

[0012] A high-pressure dual-cylinder filter is connected to the oil outlet end of the pump outlet pressure regulating valve block and is used to filter impurities in the high-pressure oil.

[0013] The accumulator and safety valve assembly are connected in parallel with the oil circuit of the high-pressure dual-cylinder filter. The accumulator is used to stabilize the system pressure and absorb pressure shocks, and the safety valve assembly is used for overpressure safety protection.

[0014] The temperature control circuit is used to cool the hydraulic oil and maintain the hydraulic station's stable operation over a long period.

[0015] As a preferred embodiment of this utility model, the pump outlet pressure regulating valve block includes a remote control relief valve, a safety relief valve, a check valve, and a solenoid directional valve. The remote control relief valve is used to set the upper limit of the system working pressure. The safety relief valve is used to force unloading when the pressure exceeds the limit abnormally. The check valve is installed in the main oil inlet circuit to prevent oil backflow. The solenoid directional valve is used to adjust the pressure control logic.

[0016] As a preferred embodiment of this utility model, the variable displacement piston pump is an automatic pressure variable type, which automatically reduces the displacement when the system pressure reaches the set value.

[0017] As a preferred embodiment of this utility model, the accumulator and safety valve group includes an accumulator, a pressure relay, and a relief valve. The accumulator is used to store and release hydraulic energy to stabilize the pressure. The pressure relay is used to convert the pressure signal into an electrical signal to achieve closed-loop control. The relief valve is used for overpressure safety protection.

[0018] As a preferred embodiment of this utility model, the temperature control circuit includes a vane pump. The oil outlet of the vane pump is connected to a backup oil filter circuit and a cooling circuit via a three-way ball valve. A first return oil filter is connected to the backup oil filter circuit, and the oil outlet of the first return oil filter is connected to the oil tank. A second return oil filter and a water cooler are connected in series in the cooling circuit, and the oil outlet of the water cooler is connected to the oil tank. An electromagnetic water valve is connected to the water cooler for controlling the cooling water.

[0019] As a preferred embodiment of this utility model, the oil tank is also equipped with a liquid level switch, a temperature sensor, and an air filter.

[0020] By adopting the above technical solution, this utility model has the following beneficial effects:

[0021] This invention utilizes a three-stage pressure regulation system—automatic variable displacement of the variable displacement plunger pump, closed-loop control of the overflow valve, and pressure stabilization by the accumulator—to reduce system pressure fluctuations, improve mold locking accuracy, enhance material injection uniformity, and increase product qualification rate. The entire process of oil suction filtration and high-pressure dual-cylinder filtration purifies the system, extending oil replacement cycles and prolonging the lifespan of precision components such as the solenoid directional valve and variable displacement pump. It integrates a triple safety mechanism for liquid level, temperature, and overpressure, enabling 24-hour continuous operation with a reduced failure rate. The high-pressure dual-cylinder filter supports filter replacement without shutting down the system, and the accumulator and safety valve assembly are equipped with manual shut-off valves, allowing for maintenance without interrupting the entire system and shortening maintenance time. Attached Figure Description

[0022] Figure 1 This is a diagram of the overall hydraulic system of this utility model;

[0023] Figure 2 This is a partial enlarged view of the variable displacement piston pump of this utility model;

[0024] Figure 3 This is a schematic diagram of the pump outlet pressure regulating valve block of this utility model;

[0025] Figure 4 This is a schematic diagram of the high-pressure dual-cylinder filter of this utility model;

[0026] Figure 5 This is a schematic diagram of the energy accumulator and safety valve assembly of this utility model;

[0027] Figure 6 This is a schematic diagram of the temperature control circuit of this utility model;

[0028] Figure 7 This is a three-dimensional front view of the hydraulic station of this utility model;

[0029] Figure 8 This is a three-dimensional view of the back of the hydraulic station of this utility model.

[0030] In the diagram: 1. Oil tank; 2. Variable displacement piston pump; 3. Pump outlet pressure regulating valve block; 31. Remote control relief valve; 32. First safety relief valve; 33. Check valve; 34. Solenoid directional valve; 35. Pressure test connector; 4. High-pressure double-cylinder filter; 5. Accumulator and safety valve assembly; 51. Accumulator; 52. Pressure relay; 53. Second safety relief valve; 6. Temperature control circuit; 61. Vane pump; 62. Three-way ball valve; 63. First return oil filter; 64. Second return oil filter; 65. Water cooler; 66. Solenoid water valve. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0032] Example 1

[0033] like Figures 1 to 8 As shown, a specific embodiment of the hydraulic station for a foaming machine according to this utility model includes:

[0034] Oil tank 1; Function: Stores hydraulic oil and provides initial heat dissipation and sedimentation of impurities;

[0035] Parameters: Effective volume 400L, compatible with No. 46 hydraulic oil, working oil temperature controlled at 15-55℃;

[0036] Auxiliary structure: An air filter is installed at the top, a liquid level sensor is installed inside, and an oil drain valve is installed at the bottom;

[0037] Variable displacement piston pump 2, connection relationship: connected to oil tank 1, driven by an 18.5kW / 400VAC / 50Hz three-phase motor; Variable displacement piston pump 2 is an automatic pressure variable type, which automatically reduces the displacement when the system pressure reaches the set value (such as 165 bar) to achieve energy saving;

[0038] Pump outlet pressure regulating valve block 3, connection relationship: the input end is directly connected to the oil outlet of variable piston pump 2, and the output end is divided into two paths: one path to high pressure dual-cylinder filter 4, and the other path to accumulator and safety valve group 5;

[0039] Internal components and functions:

[0040] Remote control relief valve 31: Sets the upper limit of the system working pressure to 165 bar, and forms a closed-loop control with the PLC and pressure sensor;

[0041] First safety relief valve 32: The overpressure protection value is set to 200 bar. When the remote control relief valve fails and the pressure rises abnormally, it will be forcibly opened to unload and protect the pump, pipeline and actuator.

[0042] One-way valve 33: Installed in the main oil inlet circuit, it only allows oil to flow from the pump outlet pressure regulating valve block 3 to the actuator in one direction;

[0043] Solenoid directional valve 34: It adopts a three-position four-way solenoid directional valve and adjusts the pressure control logic to meet the needs of different working conditions.

[0044] Pressure test connector 35: Reserved pressure test interface, which can be connected to an external pressure gauge for debugging and daily pressure monitoring;

[0045] High-pressure dual-cylinder filter 4, connection relationship: the input end is connected in series with the output end of the pump outlet pressure regulating valve block 3, and the output end is connected to the actuating elements of the foaming machine (molding cylinder, injection cylinder, etc.); it adopts a dual-cylinder parallel structure, equipped with a differential pressure transmitter (prompts filter element replacement when the differential pressure reaches 0.3 bar) and a bypass valve (automatically opens when the filter element is clogged to ensure uninterrupted oil circuit); it is used to filter impurities such as metal debris and wear particles of seals in high-pressure oil, so that the oil cleanliness meets the standard and avoids jamming of actuating elements and valve groups;

[0046] The accumulator and safety valve assembly 5 is connected in parallel with the oil circuit of the high-pressure dual-cylinder filter 4;

[0047] Main components and functions:

[0048] Accumulator 51: 20L capacity, pre-charged nitrogen pressure 90bar, working pressure range 120-160bar, can absorb the pressure shock generated by the rapid action of the actuator, and release the stored energy when the power is off to ensure the pressure of the intermittent process is maintained.

[0049] Pressure relay 52: Set the action threshold to "150 bar (trigger) / 130 bar (reset)";

[0050] Second safety relief valve 53: Overpressure protection value set at 330 bar;

[0051] Temperature control circuit 6, connection relationship: both the input and output ends are connected to oil tank 1;

[0052] Core structure and functions:

[0053] Vane pump 61: Driven by a 2.2kW / 400VAC / 50Hz three-phase motor, it provides power to the temperature control circuit and delivers return oil to the backup filtration and cooling branch;

[0054] Three-way ball valve 62: Enables the opening and closing of the "standby oil filter circuit" and the "cooling circuit";

[0055] First return oil filter 63: Installed in the standby oil filtration circuit to filter impurities in the return oil of the actuator;

[0056] Cooling circuit: The second return oil filter 64 and the water cooler 65 are connected in series. The water cooler inlet is equipped with a solenoid water valve 66, which is controlled by a temperature sensor (installed in the oil tank): when the oil temperature is >55℃, the solenoid water valve opens and the cooling water circulates for cooling; when the oil temperature is ≤50℃, the solenoid water valve closes.

[0057] The working principle of this utility model:

[0058] PLC control logic: The PLC collects the pressure signal of the main oil circuit of the system in real time. When the system pressure reaches the preset working pressure (e.g., 165 bar), the PLC controls the variable displacement piston pump 2 to automatically reduce the displacement to maintain constant pressure output; when the system pressure decreases, the pump is controlled to increase the displacement to meet the flow requirements.

[0059] Temperature control: When the oil temperature rises to the set upper limit (e.g., 55°C), the PLC outputs a signal to open the solenoid water valve 66 and start the water cooler 65 for cooling; when the oil temperature drops to the set lower limit (e.g., 50°C), the PLC closes the solenoid water valve 66 and stops cooling, thereby automatically maintaining the oil temperature within the most suitable working range.

[0060] Filter maintenance: The PLC monitors the differential pressure transmitter signal of the high-pressure dual-cylinder filter 4. When the differential pressure signal indicates that the filter element is clogged and needs to be replaced (differential pressure ≥ 0.3 bar), the PLC triggers the alarm indicator light to prompt the staff to perform the replacement operation without shutting down the machine.

[0061] PLC control technology and pressure sensors ensure that the pressure of the hydraulic station of the foaming machine is always maintained within the effective working pressure range. High-pressure double-cylinder filters 4 and return oil filters guarantee the cleanliness of the oil throughout the equipment, ensuring the safety and stability of the equipment, components, and pipelines. The addition of an accumulator 51 absorbs pressure shocks and maintains pressure even during power outages or intermittent processes. The water cooler 65, through a temperature sensor and solenoid water valve 66, automatically switches the circulating cooling system on and off. The added return oil filter ensures both the required hydraulic oil temperature and impurities, maintaining cleanliness. The variable displacement piston pump 2, through an externally connected remote control relief valve 31, achieves remote pressure control. When the pressure reaches the set value, the variable displacement piston pump 2 automatically changes pressure, significantly reducing motor power and electricity costs.

[0062] The PLC system uses existing products, such as Siemens series, which are existing technologies and will not be described in detail here.

[0063] All components mentioned in this article are general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods, so they will not be described in detail here.

[0064] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.

Claims

1. A hydraulic station for a foaming machine, characterized in that, include: Oil tank, used to store hydraulic oil; A variable displacement piston pump, connected to the oil tank, is used to pressurize and output hydraulic oil; The pump outlet pressure regulating valve block is connected to the oil outlet of the variable piston pump and is used to control the working pressure of the hydraulic system and provide overpressure protection. A high-pressure dual-cylinder filter is connected to the oil outlet end of the pump outlet pressure regulating valve block and is used to filter impurities in the high-pressure oil. The accumulator and safety valve assembly are connected in parallel with the oil circuit of the high-pressure dual-cylinder filter. The accumulator is used to stabilize the system pressure and absorb pressure shocks, and the safety valve assembly is used for overpressure safety protection. The temperature control circuit is used to cool the hydraulic oil and maintain the hydraulic station's stable operation over a long period.

2. The hydraulic station for the foaming machine according to claim 1, characterized in that, The pump outlet pressure regulating valve block includes a remote control relief valve, a safety relief valve, a check valve, and a solenoid directional valve. The remote control relief valve is used to set the upper limit of the system working pressure. The safety relief valve is used to force unload when the pressure exceeds the limit abnormally. The check valve is installed in the main oil inlet circuit to prevent oil backflow. The solenoid directional valve is used to adjust the pressure control logic.

3. The hydraulic station for the foaming machine according to claim 1, characterized in that, The variable displacement piston pump is an automatic pressure variable type, which automatically reduces the displacement when the system pressure reaches the set value.

4. The hydraulic station for the foaming machine according to claim 1, characterized in that, The accumulator and safety valve assembly includes an accumulator, a pressure relay, and a relief valve. The accumulator is used to store and release hydraulic energy to stabilize pressure. The pressure relay is used to convert pressure signals into electrical signals to achieve closed-loop control. The relief valve is used for overpressure safety protection.

5. The hydraulic station for the foaming machine according to claim 1, characterized in that, The temperature control circuit includes a vane pump. The oil outlet of the vane pump is connected to a standby oil filter circuit and a cooling circuit via a three-way ball valve. The standby oil filter circuit is connected to a first return oil filter, and the oil outlet of the first return oil filter is connected to the oil tank. The cooling circuit is connected in series with a second return oil filter and a water cooler. The oil outlet of the water cooler is connected to the oil tank. The water cooler is connected to a solenoid water valve to control the flow of cooling water.

6. The hydraulic station for the foaming machine according to claim 1, characterized in that, The oil tank is also equipped with a level switch, a temperature sensor, and an air filter.

Images