A vertical pump coaxiality measuring instrument

Abstract

The utility model relates to coaxiality measurement technical field discloses a vertical pump coaxiality measuring instrument, including metal support, shaft fixing piece and dial gauge, the metal support is used for connecting the shaft fixing piece with dial gauge, the shaft fixing piece is used for fixing on the motor shaft of the motor to be measured, the dial gauge is used for with pump shaft contact to carry out coaxiality measurement, the metal support includes a plurality of metal poles, and the between a plurality of metal poles, metal pole and shaft fixing piece and between metal pole and dial gauge all pass through lockable movable structure connection. The utility model this break the way of traditional experience calibration concentricity, adopt dial gauge accurate measurement motor shaft and pump shaft's deviation degree, provide data for realizing the accurate calibration of coaxiality, improve maintenance quality and efficiency greatly.

Description

Technical Field

[0001] This utility model relates to the field of coaxiality measurement technology, and in particular to a coaxiality measuring instrument for a vertical pump. Background Technology

[0002] Aviation fuel research primarily studies the basic knowledge and skills in petroleum science, oil and gas storage and transportation, oil depot equipment and safety management, etc. It involves the storage, transportation and management of aviation fuel, as well as the planning, design and management of aviation oil and gas storage and transportation projects to ensure an adequate supply of aircraft fuel. Currently, the "Technical Specification for the Integrity of Civil Aviation Fuel Equipment" has clear requirements for the coaxiality of the fuel pump coupling. If the coaxiality of the fuel pump and motor does not meet the standard, it will cause abnormal noise, abnormal vibration, damage to the motor and pump bearings, cause the motor and pump temperature to rise and spontaneous combustion, and cause fires.

[0003] Oil pumps in oil depots are all vertical pipeline pumps, and the space at the coupling is small. There are no special tools on the market that can measure the coaxiality. Calibration based solely on personal experience has a large error. Therefore, a vertical pump coaxiality measuring instrument is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a vertical pump coaxiality measuring instrument.

[0005] A vertical pump coaxiality measuring instrument includes a metal bracket, a shaft fixing component, and a dial indicator. The metal bracket is used to connect the shaft fixing component and the dial indicator. The shaft fixing component is used to fix the pump to the motor shaft. The dial indicator is used to contact the pump shaft to perform coaxiality measurement. The metal bracket includes multiple metal rods, and the multiple metal rods, the metal rods and the shaft fixing member, and the metal rods and the dial indicator are all connected by a lockable movable structure, which is used to adjust and lock the relative position between the dial indicator and the shaft fixing member.

[0006] Preferably, the shaft fixing component is a magnetic adsorption assembly, which is used to fix the shaft to the surface of the motor shaft by magnetic adsorption.

[0007] Preferably, the magnetic adsorption assembly includes a magnetic adsorption block, the adsorption surface of which matches the surface shape of the motor shaft.

[0008] Preferably, the metal support consists of two metal rods connected by a lockable movable structure.

[0009] Preferably, the lockable movable structure includes a first connecting part, a second connecting part, and a locking bolt. The first connecting part is provided with a normal through hole, and the second connecting part is provided with a threaded hole. The locking bolt passes through the normal through hole and is screwed into the threaded hole in sequence. By tightening the locking bolt, the contact surfaces of the first connecting part and the second connecting part are pressed together.

[0010] Preferably, the contact surfaces of the first connecting portion and the second connecting portion are provided with a texture or coating to increase friction. Beneficial effects

[0011] This invention breaks away from the traditional method of calibrating concentricity based on experience. It uses a dial indicator to accurately measure the deviation between the motor shaft and the pump shaft, providing data for accurate coaxiality calibration and greatly improving maintenance quality and efficiency.

[0012] This utility model is applicable to the adjustment of coaxiality of various vertical pumps in oil depots. It has low cost, strong versatility, and can be promoted for use in other oil depots. It effectively reduces the problem of motor and pump bearing damage caused by substandard coaxiality, extends the service life of pumps, motors, and bearings, reduces maintenance costs, and lowers the risk of fire hazards. Attached Figure Description

[0013] Figure 1 This is an overall structural diagram of a vertical pump coaxiality measuring instrument according to the present invention; Figure 2 This is a first-state diagram of the coaxiality measuring instrument for a vertical pump according to this utility model. Figure 3 This is a second state diagram during measurement using a vertical pump coaxiality measuring instrument.

[0014] In the picture: 1. Metal bracket; 11. First metal rod; 12. Second metal rod; 2. Magnetic adsorption block; 3. Dial indicator; 4. Locking bolt. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example: Please refer to Figures 1-3 This embodiment proposes a method for measuring the coaxiality between the motor shaft and the pump shaft of a vertical pipeline pump. The measuring instrument mainly consists of three parts: a metal bracket 1, a shaft fixing component, and a dial indicator 3.

[0017] In this embodiment, the shaft fixing component uses a magnetic adsorption block 2. This magnetic adsorption block 2 is preferably a high-strength neodymium iron boron permanent magnet, and its side near the motor shaft has an arc-shaped adsorption surface. The radius of curvature of this arc surface matches the outer diameter of a common motor shaft to ensure maximum contact area during adsorption and a secure and reliable fixation. The shaft fixing component can also be fixed to the motor shaft using a clamp.

[0018] The metal bracket 1 is the core component for connection and adjustment. It consists of two metal rods, the first metal rod 11 and the second metal rod 12, connected by a lockable movable structure. The same structure is also used between the second metal rod 12 and the dial indicator 3's connecting bracket, and between the first metal rod 11 and the magnetic adsorption block 2.

[0019] Taking the lockable movable structure between the first metal rod 11 and the second metal rod 12 as an example, the first connecting part is the end of the first metal rod 11. A standard through hole is machined at the center of this end. This through hole is a smooth hole, and its diameter is slightly larger than the diameter of the locking bolt 4, forming a clearance fit to ensure that the bolt can pass freely without getting stuck. The end face of the first connecting part that contacts the second connecting part is a precision-machined plane to ensure maximum contact area. The second connecting part is the end of the second metal rod 12. A threaded hole is machined at the center of this end. The thread specification of this threaded hole is perfectly matched with the thread of the locking bolt 4. The end face of the second connecting part that contacts the first connecting part is also a precision-machined plane. The locking bolt 4 is usually an internal hexagon head bolt, which passes through the standard through hole of the first connecting part and screws into the threaded hole of the second connecting part.

[0020] During angle adjustment, rotate the locking bolt 4 counterclockwise to slightly loosen it. At this time, the clamping force between the contact surfaces of the first and second connecting parts is released, leaving a small gap or only slight contact between them. In this state, the operator can manually apply torque to allow the first metal rod 11 and the second metal rod 12 to rotate freely and smoothly relative to each other around the axis of the locking bolt 4, thereby adjusting the metal bracket 1 to the required measuring angle and shape. After the angle adjustment is complete, tighten the locking bolt 4 clockwise. As the bolt is screwed in, the bolt head presses against the outer surface of the first connecting part, while the threaded portion of the bolt pulls the second connecting part closer to the bolt head. This action acts like a clamping mechanism, tightly pressing the first and second connecting parts together like a sandwich. When this frictional torque is greater than the torque generated by external interferences during measurement, such as the reaction force of the dial indicator probe or the instrument's own weight, the angle of the two metal rods is firmly locked, ensuring the stability of the measurement process.

[0021] To achieve a greater locking friction torque under the same bolt tightening force, thereby improving connection reliability, we performed special treatments on the contact surfaces of the first and second connecting parts. These treatments included shot peening, wire drawing, or applying a friction coating, enabling the same locking effect to be achieved with a smaller bolt tightening torque.

[0022] Dial Indicator 3 is a commercially available general-purpose dial indicator. Its locking mechanism allows the dial indicator head to be fixed at the required angle, ensuring that its probe can reliably contact the space-constrained pump shaft surface.

[0023] Working principle: In use, the arc-shaped adsorption surface of the magnetic adsorption block 2 is firmly adsorbed onto the end of the motor shaft or a clean side surface of the motor to be tested. Adjust the various parts of the metal bracket 1 so that the probe of the dial indicator 3 can contact the outer cylindrical surface of the pump coupling or pump shaft. When the distance between the motor shaft and the pump shaft is small, the adjustment state is as follows. Figure 3 As shown; when the distance between the motor shaft and the pump shaft is large, the adjustment state is as follows. Figure 2 As shown.

[0024] Secure the entire measuring instrument to its correct position using locking bolt 4. Then, slowly and evenly rotate the motor shaft one revolution. Observe and record the readings of dial indicator 3 at four typical positions on the pump shaft: 0°, 90°, 180°, and 270°. The difference in readings represents the radial deviation between the motor shaft and the pump shaft in that direction.

[0025] Based on the measured data, adjust the installation position of the motor (front and back, left and right), and then repeat the above steps until the maximum deviation of the dial indicator readings at the four positions is within the allowable range when the motor shaft is rotated one revolution, for example, less than 0.05mm. This indicates that the coaxiality has been calibrated to be qualified.

[0026] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vertical pump coaxiality measuring instrument, characterized in that: It includes a metal bracket (1), a shaft fixing component and a dial indicator (3). The metal bracket (1) is used to connect the shaft fixing component and the dial indicator (3). The shaft fixing component is used to fix it on the motor shaft of the motor to be measured. The dial indicator (3) is used to contact the pump shaft to perform coaxiality measurement. The metal bracket (1) includes multiple metal rods. The multiple metal rods, the metal rods and the shaft fixing member, and the metal rods and the dial indicator (3) are all connected by a lockable movable structure to adjust and lock the relative position between the dial indicator (3) and the shaft fixing member.

2. The coaxiality measuring instrument for a vertical pump according to claim 1, characterized in that: The shaft fixing component is a magnetic adsorption assembly, which is used to fix the shaft to the surface of the motor shaft by magnetic adsorption.

3. The coaxiality measuring instrument for a vertical pump according to claim 2, characterized in that: The magnetic adsorption assembly includes a magnetic adsorption block (2), the adsorption surface of which matches the surface shape of the motor shaft.

4. The coaxiality measuring instrument for a vertical pump according to claim 1, characterized in that: The metal support (1) consists of two metal rods connected by a lockable movable structure.

5. A vertical pump coaxiality measuring instrument according to claim 4, characterized in that: The lockable movable structure includes a first connecting part, a second connecting part, and a locking bolt (4). The first connecting part is provided with a normal through hole, and the second connecting part is provided with a threaded hole. The locking bolt (4) passes through the normal through hole and is screwed into the threaded hole in sequence. By tightening the locking bolt (4), the contact surfaces of the first connecting part and the second connecting part are pressed together.

6. The coaxiality measuring instrument for a vertical pump according to claim 5, characterized in that: The contact surfaces of the first connecting part and the second connecting part are provided with textures or coatings to increase friction.

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