Energy-saving hydraulic system of tension releasing machine

Abstract

The utility model relates to an energy-saving hydraulic system of a releasing and tensioning machine, which comprises a hydraulic oil tank, a tensioning oil cylinder and a lifting oil cylinder, the tensioning oil cylinder and the lifting oil cylinder are communicated with the hydraulic oil tank through a constant-power plunger pump, a first reversing valve is arranged between the tensioning oil cylinder and the constant-power plunger pump, and the tensioning oil cylinder and the lifting oil cylinder are connected through the first reversing valve. A first reversing valve is arranged between the lifting oil cylinder and the constant-power plunger pump to achieve switching between a rodless cavity and a rod cavity of the tensioning oil cylinder, a second reversing valve is arranged between the lifting oil cylinder and the constant-power plunger pump, and switching between a rodless cavity and a rod cavity of the lifting oil cylinder is achieved through the second reversing valve. And the discharge end of the constant-power plunger pump is communicated with the hydraulic oil tank through an electromagnetic relief valve. The three-phase asynchronous motor can be adopted to drive the constant-power plunger pump, under the condition of the same motor power, the takt efficiency of releasing is greatly improved, the waiting time of the next procedure is shortened, and the energy consumption waste of the motor is reduced.

Description

Technical Field

[0001] This utility model relates to the field of precast pipe pile technology, and in particular to an energy-saving hydraulic system for a tensioning machine. Background Technology

[0002] In the pipe pile industry, a tensioning process is involved in the factory production of prestressed pipe piles. The commonly used method for releasing tension in existing technologies is hydraulic release, specifically using a three-phase asynchronous motor to drive a constant pressure pump plunger pump. While this configuration reduces hydraulic oil heating, for the same production efficiency, such release machines generally suffer from excessively high motor power and wasteful energy consumption. Utility Model Content

[0003] In view of the shortcomings of the existing technology, this utility model provides an energy-saving hydraulic system for tensioning machines that improves work efficiency and saves energy.

[0004] To achieve the above objectives, this utility model provides an energy-saving hydraulic system for a tensioning machine, comprising the following technical solution: a hydraulic oil tank, a tensioning cylinder, and a lifting cylinder. Both the tensioning cylinder and the lifting cylinder are connected to the hydraulic oil tank via a constant-power piston pump. A first directional valve is provided between the tensioning cylinder and the constant-power piston pump, enabling switching between the rodless and rod-side chambers of the tensioning cylinder. A second directional valve is provided between the lifting cylinder and the constant-power piston pump, enabling switching between the rodless and rod-side chambers of the lifting cylinder. The discharge end of the constant-power piston pump is connected to the hydraulic oil tank via an electromagnetic relief valve.

[0005] Preferably, the first directional valve is an electromagnetic directional valve or an electro-hydraulic directional valve, the P port of the first directional valve is connected to the discharge end of the constant power plunger pump, the A port of the first directional valve is connected to the rodless chamber of the tensioning cylinder, and the B port of the first directional valve is connected to the rod chamber of the tensioning cylinder.

[0006] Preferably, a pressure sensor is installed in the pipeline between port A of the first directional valve and the rodless chamber of the tensioning cylinder.

[0007] Preferably, the second directional valve is an electromagnetic directional valve, the P port of the second directional valve is connected to the discharge end of the constant power plunger pump, the A port of the second directional valve is connected to the rodless chamber of the lifting cylinder through a first pipeline, and the B port of the second directional valve is connected to the rod chamber of the lifting cylinder through a second pipeline.

[0008] Preferably, the P port of the second directional valve is equipped with a pressure reducing valve, which is connected to the first pressure gauge.

[0009] Preferably, both the first and second pipelines are equipped with hydraulic locks and one-way throttle valves.

[0010] Preferably, the constant power plunger pump is equipped with a three-phase asynchronous motor or a variable frequency motor.

[0011] Preferably, the constant power plunger pump is connected to an air cooler.

[0012] Preferably, the discharge end of the constant power plunger pump is connected to the first reversing valve, the second reversing valve, and the solenoid relief valve via check valves. The check valve is connected to the second pressure gauge via a third pipeline. The second pressure gauge is connected to the solenoid relief valve via a fourth pipeline. The second pressure gauge is connected to the first reversing valve and the second reversing valve via a fifth pipeline.

[0013] Preferably, the hydraulic oil tank is equipped with an air filter and a liquid level thermometer, and the suction end of the constant power plunger pump is equipped with an oil suction filter.

[0014] The energy-saving hydraulic system of the tensioning machine of this utility model can use a three-phase asynchronous motor to drive a constant power piston pump. Under the same motor power, the cycle efficiency of tensioning is greatly improved, the waiting time of the next process is reduced, and the energy consumption of the motor is reduced. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the embodiments are briefly introduced below.

[0016] Figure 1 This is a simplified schematic diagram of the energy-saving hydraulic system of the tensioning machine of this utility model.

[0017] Figure 2 This is a diagram showing the equipment layout of the energy-saving hydraulic system for the tensioning machine of this utility model. Detailed Implementation

[0018] To more clearly describe the technical content of this utility model, the following description is provided in conjunction with specific embodiments.

[0019] like Figure 1 and Figure 2The image shows an embodiment of the energy-saving hydraulic system for the tension release machine of this utility model. This energy-saving hydraulic system includes a hydraulic oil tank 3, a tensioning cylinder 1, and a lifting cylinder 2. Both the tensioning cylinder 1 and the lifting cylinder 2 are connected to the hydraulic oil tank 3 via a constant power piston pump 4. The constant power piston pump 4 is equipped with a three-phase asynchronous motor 5 or a variable frequency motor. Using a constant power piston pump to control the tension release cylinder improves efficiency and reduces the tension release time without increasing the motor power. Furthermore, the lifting cylinder allows adjustment of the tension release machine's posture, enabling smooth docking with the workpiece.

[0020] A first directional valve 11 is provided between the tensioning cylinder 1 and the constant power piston pump 4. The first directional valve 11 is used to switch between the rodless chamber 13 and the rod chamber of the tensioning cylinder 1. A second directional valve 17 is provided between the lifting cylinder 2 and the constant power piston pump 4. The second directional valve 17 is used to switch between the rodless chamber and the rod chamber of the lifting cylinder 2. The discharge end of the constant power piston pump 4 is connected to the hydraulic oil tank 3 through an electromagnetic relief valve 10.

[0021] like Figure 1 As shown, the first directional valve is an electro-hydraulic directional valve. The P port of the first directional valve 11 is connected to the discharge end of the constant power plunger pump 4. The A port of the first electromagnetic directional valve 11 is connected to the rodless chamber 13 of the tensioning cylinder, and the B port of the first electromagnetic directional valve 11 is connected to the rod chamber of the tensioning cylinder 1. A pressure sensor 12 is installed in the pipeline between the A port of the first electromagnetic directional valve 11 and the rodless chamber 13 of the tensioning cylinder. The first directional valve can also be an electromagnetic directional valve.

[0022] like Figure 1 As shown, the second directional valve is an electromagnetic directional valve. The P port of the second directional valve 17 is connected to the discharge end of the constant power plunger pump 4. The A port of the second directional valve 17 is connected to the rodless chamber of the lifting cylinder 2 via a first pipeline, and the B port of the second directional valve 17 is connected to the rod chamber 14 of the lifting cylinder via a second pipeline. A pressure reducing valve 18 is installed at the P port of the second directional valve 17, and the pressure reducing valve 18 is connected to the first pressure gauge 19.

[0023] Hydraulic locks 15 and one-way throttle valves 16 are installed in both the first and second pipelines.

[0024] like Figure 1 As shown, the constant power plunger pump 4 is connected to the air cooler.

[0025] like Figure 1As shown, the discharge end of the constant power plunger pump 4 is connected to the first reversing valve 11, the second reversing valve 17, and the electromagnetic relief valve 10 via a one-way valve 8. The one-way valve 8 is connected to the second pressure gauge 9 via a third pipeline. The second pressure gauge 9 is connected to the electromagnetic relief valve 10 via a fourth pipeline. The second pressure gauge 9 is connected to the first reversing valve 11 and the second reversing valve 17 via a fifth pipeline.

[0026] like Figure 1 As shown, the hydraulic oil tank 3 is equipped with an air filter 7 and a liquid level thermometer 6, and the suction end of the constant power plunger pump 4 is equipped with an oil suction filter.

[0027] The specific operation process of the energy-saving hydraulic system of the tensioner of this utility model in a complete working cycle is as follows:

[0028] S1: The lifting cylinder moves slowly, allowing the unwinding structure to enter the ready-to-work position.

[0029] High-pressure oil enters the rodless chamber of the lifting cylinder through the pressure reducing valve, the P and A ports of the second directional valve, the hydraulic lock, and the one-way throttle valve. When the lifting cylinder extends to the appropriate position, the lifting cylinder stops moving, and the tensioning structure enters the ready-to-work position.

[0030] By adjusting the different positions of the lifting cylinder, the unwinding machine can be smoothly connected with the workpiece. After the unwinding machine is successfully connected with the workpiece, the unwinding cylinder can be engaged.

[0031] S2: Release the hydraulic cylinder under heavy load and extend it slowly.

[0032] At the beginning of the unwinding process, when the electromagnet YV1a of the first directional valve and the electromagnet YV0 of the electromagnetic relief valve are energized simultaneously, the three-phase asynchronous motor drives the constant power plunger pump through the coupling to draw oil from the hydraulic oil tank into the constant power plunger pump through the suction filter. The constant power plunger pump supplies the pressurized hydraulic oil through the check valve into the P and A ports of the first directional valve and into the rodless chamber of the unwinding cylinder. At this time, due to the large load, the oil pumped by the constant power plunger pump has high pressure and low flow rate, and the unwinding cylinder extends slowly under heavy load.

[0033] S3: Release the hydraulic cylinder and quickly retract it.

[0034] When the solenoid YV1b of the first directional valve and the solenoid YV0 of the electromagnetic relief valve are energized simultaneously, the oil pumped by the constant power plunger pump has a low pressure and a large flow rate. At this time, the pressurized oil is injected into the rod chamber of the tension release cylinder through the P and B ports of the first directional valve, causing the tension release cylinder to retract quickly.

[0035] S4: Release the hydraulic cylinder and extend it quickly under light load.

[0036] When the load pressure is low, the solenoid YV1a of the first directional valve and the solenoid YV0 of the solenoid relief valve are energized simultaneously. At this time, the three-phase asynchronous motor drives the constant power plunger pump through the coupling to draw oil from the hydraulic oil tank into the constant power plunger pump through the suction filter. The constant power plunger pump supplies the pressurized hydraulic oil through the check valve into the P and A ports of the first directional valve and into the rodless chamber of the release cylinder. At this time, due to the low load, the oil pressure pumped by the constant power plunger pump is low and the flow rate is high. At this time, the release cylinder extends quickly under light load.

[0037] S5: Release the hydraulic cylinder and quickly retract it.

[0038] When the solenoid YV1b of the first directional valve and the solenoid YV0 of the electromagnetic relief valve are energized simultaneously, the oil pumped by the constant power plunger pump has a low pressure and a large flow rate. At this time, the pressurized oil is injected into the rod chamber of the tension release cylinder through the P and B ports of the first directional valve, causing the tension release cylinder to retract quickly.

[0039] The energy-saving hydraulic system of the tensioning machine of this utility model can use a three-phase asynchronous motor to drive a constant power piston pump. Under the same motor power, the cycle efficiency of tensioning is greatly improved, the waiting time of the next process is reduced, and the energy consumption of the motor is reduced.

[0040] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. An energy saving hydraulic system for a printing press, characterized in that, The hydraulic oil tank, the tensioning oil cylinder and the lifting oil cylinder are connected with the hydraulic oil tank through the constant power plunger pump, the first reversing valve is arranged between the tensioning oil cylinder and the constant power plunger pump, the first reversing valve is used for switching between the rodless cavity and the rod cavity of the tensioning oil cylinder, the second reversing valve is arranged between the lifting oil cylinder and the constant power plunger pump, the second reversing valve is used for switching between the rodless cavity and the rod cavity of the lifting oil cylinder, and the discharge end of the constant power plunger pump is connected with the hydraulic oil tank through the electromagnetic overflow valve.

2. The energy saving hydraulic system for a sheeting machine according to claim 1, wherein The first reversing valve is an electromagnetic reversing valve or an electro-hydraulic reversing valve, the P port of the first reversing valve is connected with the discharge end of the constant power plunger pump, the A port of the first reversing valve is connected with the rodless cavity of the tensioning oil cylinder, and the B port of the first reversing valve is connected with the rod cavity of the tensioning oil cylinder.

3. The energy saving hydraulic system for a sheeting machine of claim 2, wherein, A pressure sensor is arranged in the pipeline between the A port of the first reversing valve and the rodless cavity of the tensioning oil cylinder.

4. The energy saving hydraulic system for a sheeting machine of claim 1, wherein, The second reversing valve is an electromagnetic reversing valve, the P port of the second reversing valve is connected with the discharge end of the constant power plunger pump, the A port of the second reversing valve is connected with the rodless cavity of the lifting oil cylinder through the first pipeline, and the B port of the second reversing valve is connected with the rod cavity of the lifting oil cylinder through the second pipeline.

5. The energy saving hydraulic system for a sheeting machine of claim 4, wherein, The P port of the second reversing valve is provided with a pressure reducing valve, and the pressure reducing valve is connected with a first pressure gauge.

6. The energy saving hydraulic system for a sheeting machine of claim 4, wherein, The first pipeline and the second pipeline are provided with hydraulic locks and one-way throttles.

7. The energy saving hydraulic system for a sheeting machine of claim 1 wherein, The constant power plunger pump is provided with a three-phase asynchronous motor or a variable frequency motor.

8. The energy saving hydraulic system for a sheeting machine of claim 1 wherein, The constant power plunger pump is connected with an air cooler.

9. The energy saving hydraulic system for a sheeting machine of claim 1 wherein, The discharge end of the constant power plunger pump is connected with the first reversing valve, the second reversing valve and the electromagnetic overflow valve through a one-way valve, the one-way valve is connected with a second pressure gauge through a third pipeline, the second pressure gauge is connected with the electromagnetic overflow valve through a fourth pipeline, and the second pressure gauge is connected with the first reversing valve and the second reversing valve through a fifth pipeline.

10. The energy saving hydraulic system for a sheeting machine of claim 1 wherein, The hydraulic oil tank is provided with an air filter and a liquid level thermometer, and the suction end of the constant power plunger pump is provided with an oil suction filter.

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