A noise reduction energy-saving pressure maintaining system and method of a thermoforming machine

Abstract

The application discloses a noise reduction, energy saving and pressure maintaining system and method of a hot forming machine, and the system comprises a power unit, a high-pressure filtering unit, a pressure loading and distribution unit, a servo control unit, a gas loading unit and an oil cylinder; wherein the power unit, the high-pressure filtering unit, the pressure loading and distribution unit, the servo control unit and the oil cylinder execution unit are sequentially connected in series, and the gas loading unit is connected to the pressure loading and distribution unit, so that the power unit composed of a motor and a hydraulic pump can rapidly increase pressure in a pressure increasing process, the gas control system composed of an accumulator can provide power in a pressure maintaining process, and the process of noise reduction, energy saving and pressure maintaining is realized.

Description

Technical Field

[0001] This invention belongs to the field of thermoforming machine equipment, and in particular relates to a noise reduction, energy saving, and pressure holding system and method for thermoforming machines. Background Technology

[0002] Thermoforming machines are commonly used equipment in the manufacture of complex lightweight alloy thin-walled hollow components. They are widely used in the production of aluminum-magnesium alloy, titanium alloy, ultra-high temperature alloy components, and non-metallic composite materials in fields such as aerospace, shipbuilding, rail transportation, civil aircraft, nuclear energy, and new energy vehicles.

[0003] Thermoforming machines have long holding times. Traditional holding systems provide holding energy by rotating a hydraulic pump driven by a motor. This process generates significant energy waste and noise pollution, which can negatively impact the working environment and the physical and mental health of operators. How to reduce energy loss during the holding stage and reduce noise during equipment operation are urgent problems to be solved in the design of thermoforming machines. Summary of the Invention

[0004] The technical problem solved by this application is to overcome the shortcomings of the prior art and provide a noise reduction and energy-saving pressure holding system and method for a thermoforming machine, which can effectively reduce the noise generated by the power system during the pressure holding process of the thermoforming machine and achieve a more economical and energy-saving pressure holding process.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] In one aspect, a noise reduction and energy-saving pressure-holding system for a thermoforming machine is provided, including a servo control unit connected to a hydraulic cylinder, wherein the two chambers of the hydraulic cylinder are respectively connected to a first control tube and a second control tube;

[0007] The servo control unit includes a servo directional valve, which has four ports. The other ends of the first and second control tubes are connected to the servo directional valve. The servo directional valve is also connected to the main oil supply pipe and the oil outlet pipe.

[0008] The other end of the main oil supply pipe is connected to the second oil supply pipe and the pressure loading pipe. The other end of the pressure loading pipe is connected to the gas loading unit, and the pressure loading pipe is also connected to the first oil supply pipe. The other ends of the first oil supply pipe and the second oil supply pipe are connected to the oil tank and used for oil supply.

[0009] When the hydraulic cylinder pressurizes and depressurizes, the second oil supply pipe is used to supply oil to the servo directional valve, and the first oil supply pipe is used to supply oil to the gas loading unit for energy storage. When the hydraulic cylinder holds pressure, the gas loading unit is used to supply oil to the servo directional valve.

[0010] The end of the main oil supply pipe away from the servo directional valve has a pressure loading and distribution unit. The pressure loading and distribution unit includes a solenoid ball valve and a check valve. The solenoid ball valve is installed on the pressure loading pipe and is located between the connection position of the pressure loading pipe and the first oil supply pipe and the connection position of the pressure loading pipe and the second oil supply pipe. Check valves are installed on both the first oil supply pipe and the second oil supply pipe so that the oil in the first oil supply pipe and the second oil supply pipe can only flow to the pressure loading pipe and / or the main oil supply pipe.

[0011] The pressure loading and distribution unit also includes an electromagnetic loading valve. Both the first oil supply pipe and the second oil supply pipe are equipped with an electromagnetic loading valve, and the electromagnetic loading valve is located in front of the check valve along the oil flow direction.

[0012] The gas loading unit includes an air inlet pipe and an accumulator. The accumulator includes a liquid chamber and a gas chamber, with a flexible structure between the liquid chamber and the gas chamber. One end of the air inlet pipe is connected to a gas source, and the other end is connected to the gas chamber of the accumulator. The liquid chamber of the accumulator is connected to the pressure loading pipe.

[0013] Along the direction of air intake into the accumulator's air chamber, an air pressure gauge, a pressure reducing valve, an electro-proportional valve, and a gas sensor are connected in sequence on the air intake pipe.

[0014] The pressure loading tube is equipped with an oil pressure sensor, which is located at the outlet of the accumulator's liquid chamber.

[0015] A power unit is provided at the end of the first oil supply pipe and the second oil supply pipe away from the pressure loading pipe. The power unit includes a plunger pump and a motor. The plunger pump is a two-stage plunger pump. The two-stage plunger pump is provided with an oil inlet and two oil outlets. The oil inlet of the two-stage plunger pump is connected to the oil tank, and the two oil outlets of the two-stage plunger pump are respectively connected to the first oil supply pipe and the second oil supply pipe.

[0016] High-pressure filtration devices are installed on the first and second oil supply pipes. The high-pressure filtration devices include high-pressure filters. On both the first and second oil supply pipes, the high-pressure filters are located between the check valve and the oil tank.

[0017] The servo control unit also includes a hydraulic lock and pressure sensors. The hydraulic lock is connected to the first control tube and the second control tube to restrict the flow direction of the oil in the first control tube and the second control tube. Two pressure sensors are provided, which are respectively connected to the first control tube and the second control tube, and the pressure sensors are located between the hydraulic lock and the oil cylinder to detect the oil pressure in the first control tube and the second control tube.

[0018] The oil tank is equipped with an air filter and a liquid level thermometer.

[0019] Secondly, a noise reduction and energy-saving pressure holding method for a thermoforming machine is provided, which uses any of the noise reduction and energy-saving pressure holding systems described above for pressure holding, including...

[0020] When the master cylinder is pressurized, the power unit is turned on, both solenoid loading valves are activated, the solenoid ball valve is closed, the oil enters the first oil supply pipe and enters the liquid chamber of the accumulator for energy storage, at the same time the oil enters the second oil supply pipe, then enters the main oil supply pipe and the servo reversing valve, and pressurizes the oil cylinder through the first control pipe and the second control pipe.

[0021] When the master cylinder is holding pressure, only the solenoid ball valve is opened, and the gas loading unit provides pressure to the main oil supply pipe through the pressure loading pipe, thereby providing pressure to the oil cylinder.

[0022] In summary, this application includes at least the following beneficial technical effects:

[0023] 1) It can enable the thermoforming machine to rapidly increase pressure during the pressurization stage, so as to reach the target pressure in the shortest time.

[0024] 2) It can reduce equipment noise during the pressure holding stage, minimizing noise pollution.

[0025] 3) It can achieve economic and energy-saving operation during the pressure holding stage, reducing the energy consumption of the equipment during pressure holding. Attached Figure Description

[0026] Figure 1 Overall schematic diagram of the noise reduction, energy saving, and pressure holding system for a thermoforming machine;

[0027] Figure 2 Schematic diagram of the power unit and high-pressure filter unit;

[0028] Figure 3 This is a schematic diagram of the gas loading unit;

[0029] Figure 4 Schematic diagram of the pressure loading and distribution unit;

[0030] Figure 5 This is a schematic diagram of the servo control unit and the hydraulic cylinder.

[0031] Explanation of reference numerals: 1. Power unit; 2. High-pressure filtration unit; 3. Pressure loading and distribution unit; 4. Servo control unit; 5. Gas loading unit; 6. Hydraulic cylinder;

[0032] 11. Piston pump; 12. Motor; 13. Oil tank;

[0033] 21. High-pressure filter;

[0034] 31. Check valve; 32. Solenoid loading valve; 33. Solenoid ball valve;

[0035] 41. Servo directional valve; 42. Hydraulic lock; 43. Pressure sensor;

[0036] 51. Pressure gauge; 52. Pressure reducing valve; 53. Electro-proportional valve; 54. Gas sensor; 55. Accumulator; 56. Oil pressure sensor;

[0037] 71. First oil supply pipe; 72. Second oil supply pipe; 73. Main oil supply pipe; 74. First control pipe; 75. Second control pipe; 76. Oil outlet pipe; 77. Pressure loading pipe. Detailed Implementation

[0038] 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. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0039] This application discloses a noise reduction, energy-saving, and pressure-holding system for a thermoforming machine, such as... Figures 1 to 5 As shown, it includes a power unit 1, a high-pressure filtration unit 2, a pressure loading and distribution unit 3, a servo control unit 4, a gas loading unit 5, and a hydraulic cylinder 6.

[0040] like Figure 1 As shown, the oil supply pipeline includes a first oil supply pipe 71, a second oil supply pipe 72, a main oil supply pipe 73, a first control pipe 74, a second control pipe 75, an oil outlet pipe 76, and a pressure loading pipe 77. One end of the first oil supply pipe 71 and the second oil supply pipe 72 are connected to the power unit 1, and the other end of each is connected to the pressure loading pipe 77. Specifically, one end of the pressure loading pipe 77 is connected to the end of the second oil supply pipe 72, the middle part is connected to the end of the first oil supply pipe 71, and the other end is connected to the gas loading unit 5. The end of the second oil supply pipe 72 is also connected to the main oil supply pipe 73. Along the oil supply direction, the high-pressure filter unit 2 and the pressure loading and distribution unit 3 are connected in sequence to the first oil supply pipe 71 and the second oil supply pipe 72. The high-pressure filter unit 2 is used to filter the oil in the first oil supply pipe 71 and the second oil supply pipe 72. The pressure loading and distribution unit 3 is used to control the pressure loading. The other end of the main oil supply pipe 73 is connected to the servo control unit 4. One end of the first control pipe 74, the second control pipe 75, and the oil outlet pipe 76 is also connected to the servo control unit 4. The other ends of the first control pipe 74 and the second control pipe 75 are respectively connected to the two ends of the oil cylinder 6.

[0041] The pressure can be rapidly increased through a power unit consisting of a motor and a hydraulic pump during the pressurization process, and the pressure holding process is powered by a gas control system consisting of an accumulator, thus achieving a noise-reducing and energy-saving pressure holding process.

[0042] like Figure 1 and Figure 2As shown, the power unit 1 includes a plunger pump 11, a motor 12 (M1), and an oil tank 13. The plunger pump 11 is a two-stage plunger pump 11, which has an oil inlet and two oil outlets. The oil inlet of the two-stage plunger pump 11 is connected to the oil tank 13. The two oil outlets of the two-stage plunger pump 11 are respectively connected to the first oil supply pipe and the second oil supply pipe. The plunger pump 11 is connected to the motor 12, which drives the plunger pump 11 to pump oil from the oil tank 13 into the first oil supply pipe 71 and the second oil supply pipe 72.

[0043] The high-pressure filtration device 2 consists of two high-pressure filters 21. Each high-pressure filter 21 is equipped with an oil inlet and an oil outlet. Oil enters through the oil inlet, is filtered, and finally flows out through the oil outlet. One high-pressure filter 21 is connected to the first oil supply pipe, and the other high-pressure filter 21 is connected to the second oil supply pipe.

[0044] like Figure 1 and Figure 4 As shown, the pressure loading and distribution unit 3 includes two check valves 31, two electromagnetic loading valves 32 (1DT and 2DT), and one electromagnetic ball valve 33 (3DT). The two check valves 31 are respectively connected to the first oil supply pipe 71 and the second oil supply pipe 72, and the two electromagnetic loading valves 32 are respectively connected to the first oil supply pipe 71 and the second oil supply pipe 72. Specifically, one electromagnetic loading valve 32 (1DT) is connected to the first oil supply pipe 71, and the other electromagnetic loading valve 32 (2DT) is connected to the second oil supply pipe 72. Along the oil flow direction, the electromagnetic loading valve 32 is located in front of the check valves 31. The electromagnetic ball valve 33 is connected to the pressure loading pipe 77, and the electromagnetic ball valve 33 is located between the connection position of the pressure loading pipe 77 and the first oil supply pipe 71 and the connection position of the pressure loading pipe 77 and the second oil supply pipe 72. During pressure holding, when the solenoid ball valve 33 is opened, the gas loading unit 5 provides pressure to the main oil supply pipe 73 through the pressure loading pipe 77, thereby providing pressure to the oil cylinder 6. The power unit 1 does not need to work continuously to hold pressure, which reduces the energy loss during the pressure holding stage.

[0045] Each check valve is connected in series with each solenoid loading valve to provide power to the accumulator and the cylinder respectively. A solenoid ball valve 33 is provided between the two circuits, which can switch the power between the two circuits by opening and closing under specific conditions.

[0046] like Figure 1 and Figure 5As shown, the servo control unit 4 includes a servo directional valve 41 (BL1), a hydraulic lock 42, and pressure sensors 43 (YL1 and YL2). The servo directional valve 41 (BL9) has four ports. The other end of the main oil supply pipe 73 is connected to one port (P port) of the servo directional valve 41. One end of the first control pipe 74, the second control pipe 75, and the oil outlet pipe 76 are respectively connected to the other three ports of the servo directional valve 41. The other end of the oil outlet pipe 76 is connected to the oil tank. The other ends of the first control pipe 74 and the second control pipe 75 are respectively connected to the two ends of the hydraulic cylinder 6. When the piston rod of the hydraulic cylinder 6 extends, the oil inlet chamber in the hydraulic cylinder 6 is connected to the second control pipe 74. The hydraulic lock 43 is connected to the first control pipe 74 and the second control pipe 75 to restrict the flow direction of the oil in the first control pipe 74 and the second control pipe 75. Pressure sensors 43 (YL1 and YL2) are connected to the first control pipe 74 and the second control pipe 75 respectively, and the pressure sensors 43 are located between the hydraulic lock 42 and the oil cylinder 6, and are used to detect the oil pressure in the first control pipe 74 and the second control pipe 75.

[0047] Hydraulic lock 43 restricts the flow direction of oil in the first control pipe 74 and the second control pipe 75. Specifically, when the cylinder 6 is pressurized and maintained, in the first control pipe, oil flows from the cylinder 6 into the servo directional valve 41 (BL1), and in the second control pipe, oil flows from the servo directional valve 41 (BL1) into the cylinder 6. When the cylinder 6 is depressurized, in the first control pipe, oil flows from the servo directional valve 41 (BL1) into the cylinder 6, and in the second control pipe, oil flows from the cylinder 6 back to the servo directional valve 41 (BL1). When the cylinder 6 is stationary, the oil flow in the first and second control pipes remains constant.

[0048] like Figure 1 and Figure 3 As shown, the gas loading unit 5 includes an air inlet pipe and an accumulator 55. The accumulator 55 includes a liquid chamber and a gas chamber. One end of the air inlet pipe is connected to a gas source, and the other end is connected to the gas chamber of the accumulator 55. Along the direction of air intake into the gas chamber, a pressure gauge 51, a pressure reducing valve 52, an electro-proportional valve 53 (BL2), and a gas sensor 54 (pressure) are connected sequentially to the air inlet pipe. The liquid chamber of the accumulator 55 is connected to a pressure loading pipe 77, which is equipped with an oil pressure sensor 56 located at the outlet of the liquid chamber of the accumulator 55. Through the above arrangement, the liquid chamber is connected to the first oil supply pipe 71 through the pressure loading pipe 77. By setting up the air inlet pipe and the various parts connected to it, continuous pressurization of the gas chamber of the accumulator 55 can be achieved, which is beneficial for the continuous pressure maintenance of the oil cylinder 6.

[0049] The fuel tank is equipped with an air filter, a liquid level thermometer, etc.

[0050] The following table shows the sequence of solenoid valve actions.

[0051] Solenoid valve action sequence table

[0052]

[0053] In the table, The blank space in the table indicates that power is supplied (starting). A blank space indicates that power is not supplied. The master cylinder refers to hydraulic cylinder 6.

[0054] When the master cylinder is pressurized, both solenoid loading valves 32 are activated, the solenoid ball valve 33 is closed, and the servo directional valve 41 (BL1) and the electro-proportional valve 53 (BL1) are activated. The oil enters the first oil supply pipe 71 through the power unit 1 and enters the liquid chamber of the accumulator 55 for energy storage. The air chamber of the accumulator 55 is also continuously pressurized to maintain a certain pressure balance between the air chamber and the liquid chamber of the accumulator 55. At the same time, the oil enters the second oil supply pipe 72 through the power unit 1, and then enters the main oil supply pipe 73 and the servo directional valve 41. After that, the oil enters one chamber of the cylinder 6 from the second control pipe 75. The oil in the other chamber of the cylinder 6 flows back to the servo directional valve 41 from the first control pipe 74 and flows back to the oil tank from the oil outlet pipe 76.

[0055] When the master cylinder is holding pressure, the power unit 1 and the two solenoid loading valves 32 (1DT and 2DT) are closed, the solenoid ball valve 33 is opened, and the gas loading unit 5 provides pressure to the main oil supply pipe 73 through the pressure loading pipe 77, thereby providing pressure to the oil cylinder 6. The power unit 1 does not need to work continuously to hold pressure, which reduces the energy loss during the pressure holding stage.

[0056] When the main cylinder is depressurized, only one solenoid loading valve 32 (2DT) and servo directional valve 41 (BL1) connected to the second oil supply pipe are activated, and the solenoid ball valve 33 is closed. The oil enters the second oil supply pipe 72 through the power unit 1, and then enters the main oil supply pipe 73 and servo directional valve 41. After that, the oil enters one chamber of the cylinder 6 from the first control pipe 74. The oil in the other chamber of the cylinder 6 flows back to the servo directional valve 41 from the second control pipe 75 and flows back to the oil tank from the oil outlet pipe 76.

[0057] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.

[0058] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

Claims

1. A noise reduction, energy-saving, and pressure-holding system for a thermoforming machine, characterized in that: Includes a servo control unit (4) connected to the hydraulic cylinder (6), and the two chambers of the hydraulic cylinder (6) are respectively connected to the first control tube (74) and the second control tube (75); The servo control unit (4) includes a servo directional valve (41), which has four ports. The other ends of the first control tube (74) and the second control tube (75) are connected to the servo directional valve (41). The servo directional valve (41) is also connected to the main oil supply pipe (73) and the oil outlet pipe (76). The other end of the main oil supply pipe (73) is connected to the second oil supply pipe (72) and the pressure loading pipe (77). The other end of the pressure loading pipe (77) is connected to the gas loading unit (5), and the pressure loading pipe (77) is also connected to the first oil supply pipe (71). The other ends of the first oil supply pipe (71) and the second oil supply pipe (72) are connected to the oil tank (13) and used for oil supply. When the cylinder (6) pressurizes and depressurizes, the second oil supply pipe (72) is used to supply oil to the servo reversing valve (41), and the first oil supply pipe (71) is used to supply oil to the gas loading unit (5) for energy storage. When the cylinder (6) holds pressure, the gas loading unit (5) is used to supply oil to the servo reversing valve (41). The end of the main oil supply pipe (73) away from the servo directional valve (41) has a pressure loading and distribution unit (3). The pressure loading and distribution unit (3) includes an electromagnetic ball valve (33) and a check valve (31). The electromagnetic ball valve (33) is located on the pressure loading pipe (77). The electromagnetic ball valve (33) is located between the connection position of the pressure loading pipe (77) and the first oil supply pipe (71) and the connection position of the pressure loading pipe (77) and the second oil supply pipe (72). Check valves (31) are provided on both the first oil supply pipe (71) and the second oil supply pipe (72) so that the oil in the first oil supply pipe (71) and the second oil supply pipe (72) can only flow to the pressure loading pipe (77) and / or the main oil supply pipe (73). The gas loading unit (5) includes an air inlet pipe and an accumulator (55). The accumulator (55) includes a liquid chamber and a gas chamber. The liquid chamber and the gas chamber are connected by a flexible structure. One end of the air inlet pipe is connected to a gas source and the other end is connected to the gas chamber of the accumulator (55). The liquid chamber of the accumulator is connected to the pressure loading pipe (77). The servo control unit (4) also includes a hydraulic lock (42) and a pressure sensor (43). The hydraulic lock (42) is connected to the first control tube (74) and the second control tube (75) to restrict the flow direction of the oil in the first control tube (74) and the second control tube (75). Two pressure sensors (43) are provided, and the two pressure sensors (43) are respectively connected to the first control tube (74) and the second control tube (75). The pressure sensors (43) are located between the hydraulic lock (42) and the oil cylinder (6) to detect the oil pressure in the first control tube (74) and the second control tube (75).

2. The noise reduction, energy saving, and pressure holding system for a thermoforming machine according to claim 1, characterized in that: The pressure loading and distribution unit (3) also includes an electromagnetic loading valve (32). The first oil supply pipe (71) and the second oil supply pipe (72) are each equipped with an electromagnetic loading valve (32), and along the flow direction of the oil, the electromagnetic loading valve (32) is located in front of the check valve (31).

3. The noise reduction, energy saving, and pressure holding system for a thermoforming machine according to claim 1, characterized in that: Along the direction of air intake into the air chamber of the accumulator (55), a pressure gauge (51), a pressure reducing valve (52), an electro-proportional valve (53), and a gas sensor (54) are connected in sequence on the air intake pipe.

4. The noise reduction, energy saving, and pressure holding system for a thermoforming machine according to claim 1, characterized in that: The pressure loading tube (77) is equipped with an oil pressure sensor (56), which is located at the liquid chamber outlet of the accumulator (55).

5. The noise reduction, energy saving, and pressure holding system for a thermoforming machine according to claim 1, characterized in that: A power unit (1) is provided at the end of the first oil supply pipe (71) and the second oil supply pipe (72) away from the pressure loading pipe (77). The power unit (1) includes a plunger pump (11) and a motor (12). The plunger pump (11) is a two-stage plunger pump (11). The two-stage plunger pump (11) is provided with an oil inlet and two oil outlets. The oil inlet of the two-stage plunger pump (11) is connected to the oil tank (13), and the two oil outlets of the two-stage plunger pump (11) are respectively connected to the first oil supply pipe (71) and the second oil supply pipe (72).

6. The noise reduction, energy saving, and pressure holding system for a thermoforming machine according to claim 1, characterized in that: High-pressure filtration devices are provided on the first oil supply pipe (71) and the second oil supply pipe (72). The high-pressure filtration devices include high-pressure filters (21). On the first oil supply pipe (71) and the second oil supply pipe (72), the high-pressure filters (21) are located between the one-way valve (31) and the oil tank (13).

7. A method for noise reduction, energy saving, and pressure holding in a thermoforming machine, characterized in that: Pressure holding is performed using the noise reduction and energy-saving pressure holding system of a thermoforming machine according to any one of claims 1-6, including... When the main cylinder is pressurized, the power unit (1) is turned on, both electromagnetic loading valves (32) are activated, the electromagnetic ball valve (33) is closed, the oil enters the first oil supply pipe (71) and enters the liquid chamber of the accumulator (55) for energy storage, at the same time the oil enters the second oil supply pipe (72), and then enters the main oil supply pipe (73) and the servo reversing valve (41), and pressurizes the oil cylinder (6) through the first control pipe (74) and the second control pipe (75); When the main cylinder is under pressure, only the solenoid ball valve (33) is opened, and the gas loading unit (5) provides pressure to the main oil supply pipe (73) through the pressure loading pipe (77), thereby providing pressure to the oil cylinder (6).

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