A self-detecting system for the pressure retention of a cubic press

Abstract

The utility model relates to a kind of six-face top pressurizing machine pressure maintaining self-detection system in six-face top hydraulic press technical field, and it contains controller and six pistons pressure cylinders controlled in parallel by hydraulic pipeline, first pressure sensor and first solenoid valve are equipped in the branch oil return pipeline before each piston pressure cylinder front cavity connection total oil return pipeline, the front cavity and rear cavity of the piston pressure cylinder are correspondingly equipped with temperature sensor and second pressure sensor for detecting oil temperature and pressure, infrared range finder for detecting piston rod displacement is externally equipped in the piston pressure cylinder, the first pressure sensor, first solenoid valve, temperature sensor, second pressure sensor and infrared range finder are respectively connected with controller signal, and the controller signal is connected with alarm device;The pressure maintaining self-detection system can improve test convenience and accuracy, and comprehensively judge fault point.

Description

Technical Field

[0001] This utility model relates to the field of six-sided hydraulic press technology, and in particular to a self-detection system for the pressure holding performance of a six-sided hydraulic press. Background Technology

[0002] Currently, the pressure holding performance of the press is only tested during press acceptance. This involves maintaining the pressure at a certain value, stopping pressure increase and replenishment, and observing the pressure drop within a specified time. If it exceeds a certain range, the design requirements are not met. During press use, users often only report equipment malfunctions and perform repairs when the pressure increase and replenishment fail to meet process requirements. By this time, the internal sealing components of the press are already severely worn. Previously, diamonds were synthesized under conditions of frequent pressure replenishment due to rapid pressure drops during the synthesis process, resulting in fluctuating quantity and quality of synthesized diamonds. Traditional pressure holding tests are not only untimely and prone to false alarms, but also cannot pinpoint the cause of the fault, leading to low efficiency in troubleshooting and maintenance. Utility Model Content

[0003] In order to overcome the shortcomings in the background technology and solve the existing technical problems, this utility model discloses a self-testing system for the pressure holding performance of a six-sided top press, which can improve the convenience and accuracy of testing and comprehensively judge the fault point.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A self-detection system for pressure holding of a six-sided top press includes a controller and six piston cylinders controlled in parallel via hydraulic lines. Each piston cylinder has a first pressure sensor and a first solenoid valve installed on a branch return oil line before the main return oil line in its front chamber. The front and rear chambers of each piston cylinder are respectively equipped with a temperature sensor and a second pressure sensor for detecting oil temperature and pressure. An infrared rangefinder is installed outside each piston cylinder for detecting piston rod displacement. The first pressure sensor, the first solenoid valve, the temperature sensor, the second pressure sensor, and the infrared rangefinder are all connected to the controller via signal connection. The controller is also connected to an alarm device via signal connection.

[0005] Furthermore, the main return oil line is equipped with a third pressure sensor and a second solenoid valve that are connected to the controller via a corresponding signal.

[0006] Furthermore, the controller can trigger an alarm device to issue an alarm when the pressure drop per minute exceeds a set threshold, detected by the first pressure sensor, during the pressure holding period of the piston cylinder front chamber.

[0007] Furthermore, a sleeve is fixed to the outer end of the piston rod, and the infrared rangefinder is installed on the sleeve, with the detection end corresponding to the cylinder body of the piston cylinder.

[0008] Furthermore, the alarm device is configured as an audible and visual alarm.

[0009] Furthermore, the temperature sensor is configured as a platinum resistance temperature sensor or a thermocouple, and the pressure sensor is configured as a piezoresistive sensor or a ceramic thick-film capacitive sensor.

[0010] By adopting the technical solution described above, this utility model has the following beneficial effects: This utility model discloses a self-detection system for the pressure holding performance of a six-sided top press. Solenoid valves are added to the return oil lines of the piston cylinder's front chamber and the main return oil line. Pressure sensors are installed in front of these solenoid valves to monitor the pressure in the front chambers of all six cylinders (front, rear, left, right, up, and down). During operation, the solenoid valves are closed. When the pressure in the rear chamber decreases while the pressure in the front chamber increases, a leak in the working cylinder can be detected. Conversely, when the pressure in the rear chamber decreases but the pressure in the front chamber does not increase, or even decreases, a leak is detected at the rear plug location. This significantly improves the timeliness and accuracy of online detection. Furthermore, the entire electronic control system integrates multi-dimensional data such as temperature and displacement to comprehensively assess various conditions, including seal aging and pressure sensor drift. This is highly beneficial for fault location and subsequent maintenance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of an embodiment of the present utility model; Figure 2 This is a schematic diagram illustrating the application of this utility model.

[0012] In the diagram: 1. First pressure sensor; 2. First solenoid valve; 3. Piston cylinder; 4. Temperature sensor; 5. Second pressure sensor; 6. Infrared rangefinder; 7. Controller; 8. Alarm device. Detailed Implementation

[0013] The technical solution of this utility model will be described below with reference to the accompanying drawings of the embodiments of this utility model. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this utility model for the convenience of describing this utility model, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0014] Combined with appendix Figure 1-2 The aforementioned six-sided top press pressure-holding self-detection system includes a controller 7 and six piston cylinders 3 controlled in parallel via hydraulic lines. Each piston cylinder 3 has a first pressure sensor 1 and a first solenoid valve 2 installed on the branch return oil line before the main return oil line connects to its front chamber. See attached figure for details. Figure 2As shown, during the pressurization operation, the first solenoid valve 2 is closed to maintain pressure online. The first pressure sensor 1 can monitor the pressure change in the front chamber of the piston cylinder 3. Since it is a device added to the branch oil pipeline, each piston cylinder 3 can also be individually controlled to perform pressure maintenance detection. The piston cylinder 3 has a temperature sensor 4 and a pressure sensor 5 installed in its front and rear chambers, respectively, to detect oil temperature and pressure. Specifically, the temperature sensor 4 detects the oil temperature in the front chamber to help determine the working performance of the seals and pressure sensor. The pressure sensor 5 detects pressure changes in the rear chamber to help determine the location of oil leaks. An infrared rangefinder 6 is installed outside the piston cylinder 3 to detect piston rod displacement, which can also help determine the working performance of the pressure sensor. As needed, a sleeve is fixed to the outer end of the piston rod, and the infrared rangefinder 6 is installed on the sleeve with its detection end corresponding to the cylinder body of the piston cylinder 3, thereby detecting the displacement change of the piston rod relative to the cylinder body. In addition, the temperature sensor 4 is a platinum resistance temperature sensor or a thermocouple. The most commonly used platinum resistance temperature sensor is PT100. The pressure sensor is a piezoresistive sensor or a ceramic thick-film capacitive sensor. For example, Bosch Rexroth's HED 8 has a switching output, while the RDM / RDS series has an analog output. The first pressure sensor 1, the first solenoid valve 2, the temperature sensor 4, the second pressure sensor 5, and the infrared rangefinder 6 are respectively connected to the controller 7. The controller 7 can be a PLC or an embedded industrial controller 7, used to collect sensor signals, execute preset logic programs, and then drive the actuator to move, thereby combining a series of dispersed components into an automated and intelligent overall system. The controller 7 is also connected to an alarm device 8, which is set as an audible and visual alarm. When the piston cylinder 3 is holding pressure, the controller 7 can trigger the alarm device 8 to issue an alarm when the pressure drop per minute exceeds the set threshold detected by the first pressure sensor 1. The set threshold is usually triggered when the pressure drop per minute exceeds 0.5MPa, triggering a maintenance reminder alarm. For new presses, the threshold is set to 0.6MPa / min for 60-70MPa, 0.8MPa / min for 70-80MPa, and 1MPa / min for 80-90MPa, avoiding misjudgment due to different working conditions and breaking through the limitations of existing technologies that only rely on absolute pressure values ​​or simple pressure fluctuation alarms. As needed, the main return oil line is equipped with a third pressure sensor and a second solenoid valve that are connected to the corresponding signal of the controller 7. When any of the first pressure sensors 1 of the piston cylinder 3 drifts and fails, in order not to affect the detection, the first solenoid valve 2 corresponding to the first pressure sensor 1 can be opened, and the third pressure sensor and the second solenoid valve can be used to replace it for control and detection.

[0015] The self-detection system for pressure holding of the six-sided top press described in this utility model is implemented such that, under the working pressure holding state, the first solenoid valve 2 is closed. When the pressure in the rear chamber decreases and the pressure in the front chamber increases, a judgment can be made that there is leakage in the working cylinder. When the pressure in the rear chamber decreases but the pressure in the front chamber does not increase, or even decreases, it can be determined that there is oil leakage at the rear plug position. At the same time, multi-dimensional data such as pressure, temperature, and displacement are integrated to establish a comprehensive evaluation model. For example, when the pressure drop rate exceeds the threshold and the oil temperature rises abnormally, the system determines that the seal is aging. If only the pressure drop rate exceeds the standard while the temperature and displacement parameters are normal, it may be that the first pressure sensor 1 is drifting, and the third pressure sensor needs to be activated.

[0016] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims in this utility model, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. A self-testing system for the pressure holding performance of a six-sided top press, characterized in that: The device includes a controller and six piston cylinders controlled in parallel via hydraulic lines. Each piston cylinder has a first pressure sensor and a first solenoid valve installed on a branch return line before the main return line in its front chamber. The front and rear chambers of each piston cylinder are respectively equipped with a temperature sensor and a second pressure sensor for detecting oil temperature and pressure. An infrared rangefinder is installed outside each piston cylinder for detecting piston rod displacement. The first pressure sensor, the first solenoid valve, the temperature sensor, the second pressure sensor, and the infrared rangefinder are all connected to the controller signal, which is connected to an alarm device.

2. The self-testing system for pressure holding performance of a six-sided top press as described in claim 1, characterized in that: The main return oil line is equipped with a third pressure sensor and a second solenoid valve that are connected to the controller via a corresponding signal.

3. The self-testing system for pressure holding performance of a six-sided top press according to claim 1, characterized in that: The controller can trigger an alarm device to issue an alarm when the pressure drop per minute exceeds a set threshold, detected by the first pressure sensor, during the pressure maintenance of the piston cylinder front chamber.

4. The self-detection system for pressure holding performance of a six-sided top press according to claim 1, characterized in that: The piston rod is fixed to a sleeve at its outer end, and the infrared rangefinder is mounted on the sleeve with its detection end corresponding to the cylinder body of the piston cylinder.

5. The self-testing system for pressure holding performance of a six-sided top press according to claim 1, characterized in that: The alarm device is set as an audible and visual alarm.

6. The self-testing system for pressure holding performance of a six-sided top press according to claim 1, characterized in that: The temperature sensor is set as a platinum resistance temperature sensor or a thermocouple, and the pressure sensor is set as a piezoresistive sensor or a ceramic thick film capacitive sensor.

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