TWI570760B - A method of inspecting pressure switch - Google Patents

Description

Pressure switch detection method

The present invention relates to a detection method, and more particularly to a detection method for detecting the stability of a pressure switch and whether a set point is within a specification.

a fluid pressure circuit for supplying a pressure fluid from a fluid pressure source to an actuator such as an air pressure cylinder is provided with a pressure switch for detecting a fluid pressure in the flow path and driving a fluid pressure supply source by a signal thereof Fluid pressure machine, etc.

However, after using for a period of time, the accuracy of the pressure switch is different from the set value. In order to avoid excessive error between the actual set point of the pressure switch and the original set point, and the action occurs at the wrong pressure value, it is necessary to periodically check the pressure switch.

In view of the prior art, it is an object of the present invention to provide a method of detecting a pressure switch. In the easiest way, beginners can understand the most basic principles and the state of the action; and can instantly determine the quality of the switch to reduce human error or waste of time.

In an embodiment, the present invention provides a method for detecting a pressure switch for detecting a pressure switch. A pressure switch detecting method for detecting a pressure switch, the method for detecting the pressure switch comprises the following steps: a) preparing a standard pressure generator and a pressure sensor, and connecting the pressure switch and the pressure sensor to the pressure switch a standard pressure generator; b) having a detecting device and establishing a plurality of data on the detecting device, wherein the data includes a set point pressure value and a pressure switch operating condition; c) an electrical connection detecting device, a pressure switch and a pressure sensing d) standard pressure generator applies pressure to pressure sensor and pressure switch; d) record pressure a set pressure value of the switch and a reset pressure value; f) calculating an error value between the set pressure value, the reset pressure value, and the set pressure value; and g) determining whether the pressure switch is qualified or unqualified according to the error value.

When the detecting device of the step b establishes the data, the detecting device displays the establishing data screen, and the field on the created data screen includes an engineering name field, an instrument number field, an instrument type field, and an instrument label field. a set point field, a checked input field, a pressure unit field, an action type field, an action status field, an allowable error field and an environmental data field, the set pressure value is established Set the point field, the pressure switch action condition is established in the action type field.

In other embodiments of the present technical aspect, after the step f, the method further includes the following steps: f1) determining whether three times of detection have been completed; f2) after step f1, or failing to complete three times of detection, replying to step d; and f3 After step f1, if three tests have been completed, the step g is repeated, and it is determined whether the pressure switch is qualified according to the error value.

In addition, in other embodiments, the method for detecting the pressure switch of the present invention may further include the following steps: Step h) Display a detection table including a set pressure value, a reset pressure value, and an error value.

In the other embodiments, before the step d, the method may further include the following steps: d0) recording the instantaneous pressure value of the standard pressure generator; before the step g, the method may further include the following Step: g0) draw a detection curve according to the set pressure value, the reset pressure value and the immediate pressure value.

In addition, in the technical aspect, the detecting device comprises a microprocessor, an operation interface, a storage unit, a display screen and an output interface. The operation interface is electrically connected to the microprocessor for establishing data; the storage unit is electrically connected to the microprocessor for storing the set pressure value, the reset pressure value, the error value and the immediate pressure value; the display screen is electrically connected to the microprocessor, The display interface is electrically connected to the microprocessor for outputting the detection table and the detection curve; the pressure sensor is electrically connected to the microprocessor, and the pressure sensor is connected to the standard pressure generator. Used to detect the instantaneous pressure value of a standard pressure generator.

1‧‧‧Standard pressure generator

10‧‧‧pressure output

12‧‧‧Pressure tube

3‧‧‧ Pressure switch

30‧‧‧Pneumatic input

4‧‧‧Detection device

40‧‧‧Operation interface

42‧‧‧ display screen

420‧‧‧Information screen

421‧‧‧Project Name Field

422‧‧‧ instrument number field

423‧‧‧ Instrument Type Field

424‧‧‧ Instrument label field

425‧‧‧Setpoint field

426‧‧‧Checked input field

427‧‧‧pressure unit field

428‧‧‧Action Type Field

429‧‧‧Action Status Field

430‧‧‧allowable error field

431‧‧‧Environmental Information Field

432‧‧‧Results field

44‧‧‧Microprocessor

46‧‧‧storage unit

48‧‧‧ Output interface

50‧‧‧pressure sensor

6‧‧ Report

60‧‧‧Basic information

62‧‧‧Checklist

64‧‧‧Detection curve

Flow chart of S100~S112‧‧‧ pressure switch detection method

1 is a schematic flow chart of a method for detecting a pressure switch of the present invention.

2 is a schematic view showing the connection of the detecting device, the standard pressure generator, the pressure sensor and the pressure switch of the present invention.

FIG. 3 is a schematic diagram of a data creation screen of the present invention.

4 is a schematic view showing a calibration curve of the pressure switch of the present invention.

Fig. 5 is a schematic view showing the detection report of the pressure switch of the present invention.

The above and other objects, features and advantages of the present invention will become more apparent from

The pressure switch can be applied to an electronic device such as a water pump, a steam boiler, a pneumatic device or a hydraulic device to form a switching path or an open circuit through a change in fluid pressure to control the activation or shutdown of an electronic device electrically connected thereto.

The detection method of the pressure switch of the invention is by applying pressure on the pressure switch to detect whether the pressure switch can be smoothly closed or opened when the pressure switch is at a preset pressure value, thereby determining whether the stability of the pressure switch and the set point are within the specification. .

Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a schematic flow chart of a method for detecting a pressure switch according to the present invention. FIG. 2 is a schematic diagram of a detection device, a standard pressure generator pressure sensor and a pressure switch according to the present invention. As shown in FIG. 1, step 100 is provided with a standard pressure generator 1 and a pressure sensor 50, which may be, for example, a hand pump. As shown in FIG. 2, the standard pressure generator 1 includes a pressure output end 10, the pressure output end 10 is connected to a pressure transfer tube 12, and the other end of the pressure transfer tube 12 is connected to a pneumatic input end 30 of the pressure switch 3 and pressure sensing. 50. Thereby, the pressure generated by the standard pressure generator 1 can be transmitted to the pressure switch 3 and the pressure sensor 50.

In step 102, a detecting device 4 is provided, and basic data is created. The detecting device 4 includes an operation interface 40 and a display screen 42, as shown in FIG. The operation interface 40 can be composed of a plurality of buttons. The user can input basic information about the pressure switch 3 to be tested through the operation interface 40. The basic data includes at least a set point and a pressure. Force switch action type and pressure unit. Of course, the above basic information may also include the instrument number, the instrument label, the pressure unit, and the tolerance.

The display screen 42 can be, for example, a liquid crystal display for displaying a data screen 420 (shown in FIG. 3). In this embodiment, the field on the data screen 420 may include an engineering name field 421, an instrument number field 422, an instrument type field 423, an instrument label field 424, and a set point field 425. A checked input field 426, a pressure unit field 427, an action type field 428, an action status field 429, an allowable error field 430, an environmental data field 431, and a decision result field 432. .

In addition, the display screen 42 can also be used to display the detection result, wherein the detection result can include a detection table and a detection curve. It should be particularly noted that in the present embodiment, the operation interface 40 and the display screen 42 are respectively a button and a liquid crystal display. However, in practical applications, the operation interface 40 and the display screen 42 can be integrated into a touch display screen.

It should be specially stated that the pressure value of the pressure switch 3 when the pressure point switch 3 is operated is filled in the aforementioned set point field. The action type field can be used to select the operating condition of the pressure switch 3; the general operating condition of the pressure switch 3 can be divided into positive action (INC) and reaction (DEC), and positive action refers to pressure when the pressure reaches the set point. The switch 3 is set and reset after decompression. The reaction means that the pressure switch 3 is set when the pressure is greater than the set point, and is slowly decompressed to set the set point, and is reset after being pressurized again. When the pressure switch 3 is detected, the set point and the operating condition are the most important conditions that affect whether the pressure switch 3 is a good product. Therefore, in the data establishing step of step S102, the basic data that must be established includes at least the set point and the pressure switch. Operating conditions.

Referring to FIG. 2, the detecting device 4 further includes a microprocessor 44, a storage unit 46, and an output interface 48. The microprocessor 44 is electrically connected to the operation interface 40, the display screen 42, the storage unit 46, and the output interface 48. The data input by the user through the operation interface 40 is transferred to the microprocessor 44 and stored in the storage unit 46 for use in subsequent processes.

Referring to FIG. 1, step S103, the electrical connection detecting device 4, the standard pressure generator 1 and pressure sensor 50. The pressure sensor 50 is configured to detect the instantaneous pressure value of the standard pressure generator 1 and transmit the sensed instantaneous pressure value to the microprocessor 44 and can be stored in the storage unit 46.

In step S106, the standard pressure generator 1 applies pressure to the pressure switch 3 and the pressure sensor 50. The standard pressure generator 1 slowly changes the pressure applied to the pressure switch 3 and the pressure sensor 50 to pass the pressure up and down through the set point and the reset point.

Step S108, recording the set pressure value and the reset pressure value of the pressure switch 3, and calculating the error between the set pressure value, the reset pressure value and the set pressure value, and the detecting device 4 detects the set pressure value and the reset pressure value. At the same time, the instantaneous pressure value of the standard pressure generator 1 is also recorded, wherein the instantaneous pressure value can also be stored in the storage unit 46.

In step S109, it is determined whether three detections have been completed. Thereby, the stability of the detection can be effectively increased. If the three tests have not been completed, the process returns to step S106 to re-pressurize the pressure switch 3. If three tests have been completed, it is analyzed whether the error value is within the allowable error range (step S110).

In step S110, if the error is within the allowable error range, "pass" is displayed in the field of the determination result 432 of the display screen 42 (as shown in FIG. 3), or the error is no longer within the tolerance range, and the display screen 42 is displayed. "Failed" is described in the determination result field 432.

Further, before or after step S110, a detection table (shown in Table 1 below) including the set pressure value, the reset pressure value, and the error value may be displayed on the display screen 42 (step S112).

Finally, in step S114, the set pressure value, the reset pressure value, and the immediate pressure value are drawn. A detection curve (Fig. 4) is formed and displayed on the display screen 42. In Fig. 4, a positive acting pressure switch 3 is taken as an example, wherein the pressure switch 3 has a set pressure value of 48.1 mbar and a reset pressure value of 47.5 mbar.

Please refer to FIG. 5, which is a schematic diagram of a test report of the pressure switch of the present invention. As shown in the figure: When the pressure switch 3 of the present invention completes the test, the tester or the commissioner can transmit the data to the printer, and print the test table and the test curve to the report 6 via the printer. In the present drawing, the contents of the report 6 of the pressure switch 3 include at least the basic data 60, the test table 62, the test curve 64, and the tester.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention should still be covered by the patent of the present invention. The scope of the scope is intended to protect.

S100-S114‧‧‧ Pressure switch detection process

Claims (9)

A pressure switch detecting method for detecting a pressure switch, wherein the pressure switch detecting method comprises: a) preparing a standard pressure generator and a pressure sensor, wherein the standard pressure generator is connected to the pressure switch and the pressure sense a detector; b) having a detecting device, and establishing a plurality of data on the detecting device, wherein the data includes at least one set point pressure value and a pressure switch operating condition; c) electrically connecting the detecting device, the pressure switch And the pressure sensor; d) the standard pressure generator applies pressure to the pressure switch and the pressure sensor; e) records a set pressure value of the pressure switch and a reset pressure value; f) calculates the set The bit pressure value, the reset pressure value, and an error value between the set pressure values; and g) determining whether the pressure switch is qualified according to the error value. The method for detecting the pressure switch according to Item 1 of the present invention further comprises the following steps after the step f: f1) determining whether three tests have been completed; f2) after step f1, or failing to complete three times, the replying step d; and f3) After step f1, if three tests have been completed, the step g is repeated, and it is determined whether the pressure switch is qualified according to the error value. The method for detecting a pressure switch according to claim 1 or 2 further includes a step of: h) displaying a detection table including the set pressure value, the reset pressure value, and the error value. The method for detecting the pressure switch according to item 1 of the claim, before step e, further comprises a step of: e0) recording the instantaneous pressure value of the standard pressure generator. The method for detecting the pressure switch according to item 4 of the claim, after step g, further comprises a step of: g0) drawing a detection curve according to the set pressure value, the reset pressure value and the instantaneous pressure value. The method for detecting the pressure switch according to item 5 of the claim further comprises a step: i) The test chart and the test curve are transmitted to a printer, and the test table and the test curve are printed by the printer and a report is prepared. The method for detecting a pressure switch according to item 6 of the claim, wherein the report includes a project name, a determination result, a basic data, a test table, and a detection curve. The method for detecting a pressure switch according to Item 1, wherein when the detecting device of step b establishes data, the detecting device displays a data creation screen, and the field on the created data screen includes a project name field, An instrument number field, an instrument type field, an instrument label field, a set point field, a checked input field, a pressure unit field, an action type field, an action status field, An allowable error field and an environmental data field, the set pressure value is established in a set point field, and the pressure switch action condition is established in the action type field. The method for detecting a pressure switch as shown in claim 6, wherein the detecting device comprises: a microprocessor electrically connected to the pressure switch and the pressure sensor; an operation interface electrically connected to the microprocessor Providing the data; a storage unit electrically connected to the microprocessor for storing the set pressure value, the reset pressure value, the error value and the immediate pressure value; a display screen electrically connected The microprocessor is configured to display the detection table and the detection graph; and an output interface electrically connected to the microprocessor for outputting the detection table and the detection graph.