Pressure verification device and calibration judgment method

Abstract

The invention relates to the field of gulp valve calibration and maintenance, in particular to a pressure verification device and a calibration judgment method. The supporting base is matched with the bolt to be tightly attached to the end to be calibrated; the switching mechanism comprises a pressure output end fixedly arranged on one side of the supporting base and a pressure sensing end fixedly arranged at the end of the pressure output end. The pressure output ends are symmetrically arranged along the central axis of the supporting base. Checking preparation is carried out, and the positioning screw is tightened; in the verification process, the pressure output assembly is started; and after the verification is finished and the end to be verified is pulled, the output value of the pressure output assembly is observed. The gulp valve checking device saves time and labor, does not need to cut and carry iron blocks, can quickly complete checking through the hydraulic telescopic rod, displays numerical values in real time to ensure checking precision, avoids repeated adjustment, is suitable for gulp valve checking of different units, only needs to adjust the pressure of the hydraulic telescopic rod, reduces the link of manually carrying heavy objects, reduces the operation risk, and improves the working efficiency.

Description

Technical Field

[0001] The present invention relates to the field of calibration and maintenance of air supply valves, and in particular to a pressure calibration device and a calibration judgment method. Background Art

[0002] The air supply valve is a critical component in hydroelectric generators, primarily used to regulate the air pressure within the turbine runner chamber to ensure stable operation. Traditionally, the counterweight method has been used to inspect and calibrate the air supply valve, but this method presents numerous inconveniences.

[0003] Traditionally, the air supply valve calibration method involves using a rope-hanging method, where the weight of an iron block simulates the valve's operating pressure. This requires manual cutting of iron plates to match the required weight, then transporting the iron block to the vicinity of the air supply valve for hanging calibration. However, each calibration requires cutting and transporting the iron block, which is time-consuming and labor-intensive. The calibration requirements for air supply valves vary from unit to unit, requiring repeated adjustments to the iron block's weight, making precise matching difficult. Furthermore, the heavy weight of the iron block presents a risk of injury during manual handling, and working at height is particularly dangerous.

[0004] After the rope-hanging simulation is completed, the elastic coefficient of the air supply valve needs to be adjusted based on the weight difference to ensure that it meets the factory rated requirements. However, after the adjustment, it is difficult to accurately determine whether the elastic coefficient meets the requirements using a large iron block, and the calibration reliability is insufficient.

[0005] Therefore, there is a need for a pressure calibration device and calibration judgment method that can apply hydraulic pressure and display digitally, is simple and convenient to operate, significantly improves the convenience, accuracy and safety of calibration, and can still make quick and accurate judgments after the elastic coefficient is adjusted to meet the needs of the existing environment. Summary of the Invention

[0006] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the invention.

[0007] In view of the above-mentioned prior art, the rope lifting method is time-consuming and labor-intensive, and the weight of the iron block needs to be adjusted repeatedly, which makes it difficult to accurately match and has poor safety.

[0008] Therefore, the technical problem to be solved by the present invention is to design a pressure calibration device that can apply hydraulic pressure and digitally display, is simple and convenient to operate, and significantly improves the convenience, accuracy and safety of calibration to meet the needs of the existing environment.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: a pressure calibration device, comprising:

[0010] Support the base and tighten it against the end to be checked with bolts;

[0011] The conversion mechanism includes a pressure output end fixedly arranged on one side of the support base and a pressure sensing end fixedly arranged at the end of the pressure output end;

[0012] The pressure output ends are symmetrically arranged along the central axis of the support base.

[0013] As an improvement of the present invention,

[0014] A through-groove is provided through the supporting base;

[0015] The pressure sensing terminal is located between the through-hole and the edge of the support base.

[0016] As an improvement of the present invention,

[0017] The inner ring of the pressure sensing end is sleeved on the outer wall of the pressure output end;

[0018] The end surface of the pressure sensing terminal is fixedly connected to the supporting base.

[0019] As an improvement of the present invention,

[0020] A positioning screw is slidably provided on the inner wall of the through groove;

[0021] A blocking piece is fixedly provided on the outer wall of the positioning screw, and the blocking piece is in contact with the support base (1);

[0022] The blocking plate is located between the pressure output ends.

[0023] As an improvement of the present invention,

[0024] One end of the pressure output end is fixedly connected to the pressure output assembly;

[0025] The pressure sensing terminal is electrically connected to the pressure output assembly.

[0026] As an improvement of the present invention,

[0027] The center of the inner collar is arranged along the central drill rod;

[0028] A connecting groove is fixedly provided on the outer wall of the central drill rod, and a connecting convex strip is fixedly provided on the central inner wall of the inner collar, and the connecting convex strip is slidably matched with the connecting groove.

[0029] As an improvement of the present invention,

[0030] The outer wall of the central drill rod is fixedly connected to the limiting boss;

[0031] The limiting boss contacts and limits the bottom surface of the inner ring.

[0032] In view of the above-mentioned existing technology, after the rope hanging method simulation is completed, the elastic coefficient of the air supply valve needs to be adjusted according to the weight difference. After the adjustment, it is difficult for the large iron block to accurately determine whether the elastic coefficient meets the requirements, and the calibration reliability is insufficient.

[0033] Therefore, the technical problem to be solved by the present invention is to design a calibration judgment method that can still quickly and accurately judge after the elastic coefficient is adjusted to meet the needs of the existing environment.

[0034] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0035] A calibration judgment method, characterized by comprising: the pressure calibration device according to claim 5, and

[0036] Verify preparation and tighten the positioning screw;

[0037] During the calibration process, the pressure output assembly is started;

[0038] At the end of the calibration, after the calibration end is pulled, observe the output value of the pressure output assembly.

[0039] A calibration judgment method, comprising:

[0040] During the calibration preparation process, ensure that the calibration end contracts normally and check the rated tensile force of the end to be calibrated;

[0041] Tighten the positioning screw and place the testing liquid in the end to be checked.

[0042] As an improvement of the present invention,

[0043] During the calibration process, a pressure output safety value is preset and the pressure output assembly is turned on;

[0044] Observe the output reading of the pressure output assembly and the movement of the end to be calibrated;

[0045] When the output reading of the pressure output assembly exceeds the pressure output safety value, the pressure output assembly is closed and the working condition of the end to be verified is checked.

[0046] As an improvement of the present invention,

[0047] At the end of the calibration, after the end of the calibration is leaked with the detection liquid, the pressure output assembly is closed and the output value of the pressure output assembly is observed;

[0048] The actual difference between the output value of the pressure output assembly and the rated tension of the end to be calibrated is compared to calibrate the end to be calibrated.

[0049] As an improvement of the present invention,

[0050] Starting from 0, set the judgment intervals of the two sets of actual differences, namely the safety interval and the debugging interval outside the safety interval;

[0051] When the actual difference is within the safe range, the working condition of the end to be calibrated is normal and no calibration is required;

[0052] When the actual difference is within the debugging range, adjust the spring coefficient of the end to be checked until it is normal;

[0053] When the actual difference exceeds the debugging range, shut down the machine and thoroughly inspect and maintain the end to be calibrated.

[0054] The beneficial effects of the present invention are: saving time and labor, no need to cut and move iron blocks, the calibration can be completed quickly through the hydraulic telescopic rod, the real-time display of values ​​ensures the calibration accuracy, and avoids repeated adjustments. It is suitable for the calibration of air supply valves of different units. It only needs to adjust the pressure of the hydraulic telescopic rod, which reduces the steps of manual handling of heavy objects, reduces operational risks, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0056] Figure 1 It is a structural schematic diagram of the pressure calibration device in the present invention.

[0057] Figure 2 It is a three-dimensional schematic diagram of the pressure calibration device in the present invention.

[0058] Figure 3 This is a three-dimensional schematic diagram of the pressure calibration device in the present invention from another angle.

[0059] Figure 4 This is a calibration flow chart of the pressure calibration device in the present invention. DETAILED DESCRIPTION

[0060] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0061] Example 1

[0062] Reference Figure 1 , this embodiment provides a pressure calibration device.

[0063] The traditional rope-lift method currently used during the inspection and calibration of the supply valve involves installing a hook and wire rope combination at the bottom bolt of the supply valve, with a counterweight attached to the bottom. The supply valve has its own rated spring force, so to verify its ability to operate properly under the pressure of the operating process, a gap is left for exhaust. A counterweight is then added to the valve, forcibly pulling it out of the gap. The counterweight pressure at this point is then verified to be close to the rated spring force of the supply valve. This allows the valve to function properly and verify its operating condition.

[0064] In order to replace the traditional rope hanging method, a support base 1 is prepared. The support base 1 is used to fit tightly with the lower bolts of the air supply valve. The support base 1 can be set to the required shape and connected to the lower bolts of the air supply valve in an appropriate manner to ensure the accuracy and stability of the air supply valve maintenance process.

[0065] The conversion mechanism 2 is used to replace the traditional counterweight block to apply the reverse pressure of the air supply valve. Two pressure output terminals 21 are provided on one side of the support base 1. In this application, two pressure output terminals 21 are provided, but multiple terminals can also be provided. However, the principle of symmetrical arrangement of the pressure output terminals 21 along the central axis of the support base 1 must be followed to ensure balanced force and to prevent imbalance or even safety accidents caused by excessive force on one side.

[0066] The pressure output terminal 21 works in conjunction with a connected pressure terminal, such as a hydraulic press, to apply pressure in the opposite direction of the inflator valve, replacing the traditional rope-lift method of counterweight superposition. A pressure sensing terminal 22 is fixedly mounted on the outer wall of the pressure output terminal 21. This sensing terminal 22 detects the pressure applied by the pressure terminal to the pressure output terminal 21 in real time and feeds the pressure value back to the pressure terminal, allowing the operator to verify the actual pressure and compare it with the rated spring force of the inflator valve, thereby verifying its proper function and determining whether the valve spring requires adjustment.

[0067] Example 2

[0068] Reference Figures 1 to 3 This embodiment is based on the previous embodiment, and differs from the previous embodiment in that:

[0069] A through-groove 11 runs through the center of the support base 1, allowing it to fit snugly against the lower end of the air supply valve. A pressure sensing terminal 22 is positioned between the through-groove 11 and the edge of the support base 1, distributing pressure evenly without affecting its secure fit.

[0070] Multiple pressure sensing terminals 22 can be selected, but the pressure output terminals 21 must be symmetrically arranged along the central axis of the support base 1 to ensure balanced force and prevent excessive force on one side from causing imbalance or even safety accidents.

[0071] The inner ring of the pressure sensing end is sleeved on the outer wall of the pressure output end 21, and the end face of the pressure sensing end 22 is fixedly connected to the support base 1. This design ensures that the pressure sensing end 22 is firmly set while being able to detect the actual pressure reading as accurately as possible.

[0072] A positioning screw 12 is slidingly provided on the inner wall of the through groove 11, and a blocking piece 121 is fixedly provided on the outer wall of the positioning screw 12. When the positioning screw 12 is rotated, the positioning screw 12 approaches the air supply valve under the action of the threaded fit, and the blocking piece 121 is pressed against the support base 1, playing an auxiliary driving and fixing role, ensuring that the support base 1 can move with the movement of the positioning screw 12 until it is firmly positioned. The blocking piece 121 is located between the two pressure output ends 21 in this application.

[0073] One end of the pressure output end 21 is fixedly connected to the pressure output assembly 23. The pressure output assembly 23 is a pressure terminal with hydraulic function, which can directly act on the pressure output end 21 through a sealing structure such as a hose, thereby generating pressure in the opposite direction of the air supply valve.

[0074] The pressure sensing terminal 22 is electrically connected to the pressure output assembly 23 and can transmit the pressure value to the display screen on the pressure output assembly 23 in real time. The operator can directly monitor the entire process based on the real-time pressure value, and finally confirm the actual pressure to compare it with the rated elastic force of the air supply valve to detect whether the air supply valve can work normally and whether the spring of the air supply valve needs to be adjusted.

[0075] Example 3

[0076] Reference Figures 1 to 4 This embodiment is based on the previous embodiment, and differs from the previous embodiment in that:

[0077] Before preparing for calibration, the staff needs to conduct a preliminary check to see whether the calibration end of the air supply valve can retract normally. Only after the basic working conditions are correct can subsequent operations be carried out, and the rated tension parameters of the calibration end of the air supply valve should be checked and recorded.

[0078] After the above process is completed, the staff tightens the positioning screw 12. During the rotation of the positioning screw 12, the blocking piece 121 is close to the support base 1, playing an auxiliary driving and fixing role, ensuring that the support base 1 can move with the movement of the positioning screw 12 until it is firmly positioned.

[0079] After this step is completed, the test liquid is placed in the calibration end of the air supply valve. The test liquid can be any harmless liquid such as water. Since the air supply valve is driven by air pressure in the actual working environment, it is impossible to actually use air pressure simulation during the detection process. Therefore, it is very appropriate to use water to detect the working condition of the air supply valve.

[0080] During the calibration process, the pressure output safety value is predetermined in advance to provide a safety net for the entire test process and prevent potential safety hazards in the operation of the pressure output assembly 23. Start the pressure output assembly 23 and observe the reading displayed on the pressure output assembly 23 and the movement of the air supply valve calibration end.

[0081] If the output reading of the pressure output assembly 23 exceeds the pressure output safety value, it is necessary to immediately close the pressure output assembly 23 and check the working condition of the air supply valve calibration end. This is a special case. Under normal circumstances, the pressure output assembly 23 can make the air supply valve drop and leak out of the gap within the pressure output safety value range, which means that the air supply valve is working.

[0082] After checking the leakage detection liquid at the end, it means that the air supply valve has completed a movement simulation. At this time, close the pressure output of the pressure output assembly 23 and observe the corresponding output value of the pressure output assembly 23 on the display screen to compare it with the rated tension of the air supply valve to obtain the actual difference.

[0083] In this application, two groups of judgment intervals of actual difference values ​​are set from 0, namely the safety interval and the debugging interval outside the safety interval. The safety interval is the actual difference value of 0 to 10N. Within this interval, it means that the air supply valve is working normally and no calibration is required. The debugging interval is set to 10 to 30N. Within this interval, it means that the spring coefficient of the air supply valve needs to be calibrated. If it exceeds the rated tension of the air supply valve, it means that the elastic force of the air supply valve is higher than the preset value, and the spring coefficient of the air supply valve needs to be reduced. If it is lower than the rated tension of the air supply valve, it means that the elastic force of the air supply valve is lower than the preset value, and the spring coefficient needs to be increased.

[0084] Once the actual difference exceeds 30N, it means that there is an obvious fault in the air supply valve, the elastic coefficient problem has exceeded expectations, and there may be major structural hidden dangers. It is necessary to shut down the machine and thoroughly check the working condition of the air supply valve.

[0085] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A pressure calibration device, characterized in that: The support base (1) is fitted with bolts and pressed against the end to be checked; The conversion mechanism (2) comprises a pressure output end (21) fixedly arranged on one side of the support base (1) and a pressure sensing end (22) fixedly arranged at the end of the pressure output end (21); The pressure output end (21) is symmetrically arranged along the central axis of the support base (1).

2. The pressure calibration device according to claim 1, characterized in that: The supporting base (1) is provided with a through-hole groove (11); The pressure sensing terminal (22) is located between the through-hole groove (11) and the edge of the support base (1).

3. The pressure calibration device according to claim 2, characterized in that: The inner ring of the pressure sensing end (22) is sleeved on the outer wall of the pressure output end (21); The end surface of the pressure sensing terminal (22) is fixedly connected to the support base (1).

4. The pressure calibration device according to claim 3, characterized in that: A positioning screw (12) is slidably provided on the inner wall of the through groove (11); A blocking piece (121) is fixedly provided on the outer wall of the positioning screw (12), and the blocking piece (121) is in contact with the support base (1); The blocking plate (121) is located between the pressure output ends (21).

5. The pressure calibration device according to any one of claims 1 to 4, characterized in that: One end of the pressure output end (21) is fixedly connected to the pressure output assembly (23); The pressure sensing terminal (22) is electrically connected to the pressure output assembly (23).

6. A calibration judgment method, characterized in that: comprising the pressure calibration device according to claim 5, and Verify the preparation and tighten the positioning screw (12); During the calibration process, the pressure output assembly (23) is activated; At the end of the calibration, after the calibration end is pulled, the output value of the pressure output assembly (23) is observed.

7. The calibration determination method according to claim 6, wherein: During the calibration preparation process, ensure that the calibration end contracts normally and check the rated tensile force of the end to be calibrated; The positioning screw (12) is tightened and the detection liquid is placed in the end to be checked.

8. The calibration determination method according to claim 6, wherein: During the calibration process, a pressure output safety value is preset and the pressure output assembly (23) is turned on; Observe the output reading of the pressure output assembly (23) and the movement of the end to be checked; When the output reading of the pressure output assembly (23) exceeds the pressure output safety value, the pressure output assembly (23) is closed and the working condition of the end to be verified is checked.

9. The calibration determination method according to claim 6, wherein: At the end of the calibration, after the calibration end leaks the detection liquid, the pressure output assembly (23) is closed, and the output value of the pressure output assembly (23) is observed; The output value of the pressure output assembly (23) is compared with the actual difference between the rated tension of the end to be calibrated, and the end to be calibrated is calibrated.

10. The calibration determination method according to any one of claims 7 to 9, characterized in that: Starting from 0, set the judgment intervals of the two sets of actual differences, namely the safety interval and the debugging interval outside the safety interval; When the actual difference is within the safe range, the working condition of the end to be calibrated is normal and no calibration is required; When the actual difference is within the debugging range, adjust the spring coefficient of the end to be checked until it is normal; When the actual difference exceeds the debugging range, stop the machine and thoroughly check the end to be checked.

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