CN204740135U - A ship shafting torsional vibration testing device - Google Patents

Abstract

The utility model relates to a boats and ships torsional vibration of shafting testing arrangement, its characterized in that: including the torsional vibration sensing part, the torsional vibration sensing part including the belt rotary drum with set up the encoder on the belt rotary drum, the output shaft of belt rotary drum is fixed mutually with the encoder, and the belt rotary drum is connected through the belt and the shafting part transmission of awaiting measuring, the output connection signal acquisition appearance of encoder, signal acquisition appearance connection signal acquisition computer is compared with prior art, the utility model has the advantages of the belt rotary drum is connected through the belt and the shafting part transmission of awaiting measuring to through the accurate nature of encoder realization measurement station torsional vibration signal, for the analysis of boats and ships torsional vibration of shafting provides reliable, accurate measurement station data, realize quick collection, storage and the aftertreatment of torsional vibration signal simultaneously at computer terminal, realize high -efficient, convenient, accurate test of boats and ships torsional vibration and analysis.

Description

A ship shafting torsional vibration testing device

technical field

The utility model relates to a device for testing torsional vibration of a ship's shafting system, in particular to a device for testing and analyzing the torsional vibration of a ship's shafting system at various positions of the ship's shafting system.

Background technique

In the ship power plant, the shaft system is used to transmit the power of the main engine and the thrust of the propeller, which is arranged between the output end of the main engine and the propeller, including the transmission shaft that transmits the power of the main engine, such as the thrust shaft, the intermediate shaft, the tail shaft, The propeller shaft, etc., as well as the bearings supporting the transmission shaft and other accessories, have the characteristics of large size and complex structure. Vibration failures of ship shafting will cause damage to ship main engine, bearings, propellers and other components. Therefore, vibration testing of ship shafting is required before use.

Ship shafting vibration includes torsional vibration (referred to as torsional vibration), transverse vibration and longitudinal vibration. It is an important vibration index for evaluating the performance of ship shafting, and it is also one of the important evaluation bases for the safe operation of the ship's main propulsion system. Existing ship shafting torsional vibration tests generally use Hall digital tooth sensors to collect periodic pulse signals of flywheel end gears, thereby realizing the collection of shafting torsional vibration signals. There are three problems in this method: (1) The installation position is limited, it is limited to the position of the flywheel, and the positional relationship between the sensor and the tooth surface of the gear is vertical, and the installation gap is 1-3mm; (2) It is not easy to obtain the number of teeth. The number of teeth is a necessary parameter for the torsional vibration test of the shaft system. Before the measurement, it is necessary to mark the gear and turn the main engine for at least one turn to obtain the number of teeth; (3) The measurement accuracy is not fixed, because the collected shaft The torsional vibration signal of the system is converted through gear pulses, so its test accuracy is related to structural parameters such as gear structure, modulus, and number of teeth. There may even be cases where the test results are not credible because the accuracy is too low. There is also a method of installing a flange at the free end of the main engine, installing and collecting the torsional vibration signal of the shaft system through an encoder; although this method has high test accuracy, it needs to process the connecting flange matching the main engine under test in advance, and the process requires Higher, especially the coaxiality of the added flange; therefore, there are disadvantages such as high cost, difficult assembly, fixed installation position, etc. Therefore, it is necessary to further improve the device for torsional vibration testing of ship shafting.

Contents of the invention

The technical problem to be solved by the utility model is to provide a ship shafting torsional vibration testing device that can flexibly arrange the positions of the measuring points according to the needs of the above-mentioned prior art.

The technical solution adopted by the utility model to solve the above-mentioned technical problems is: the device for testing the torsional vibration of the ship shafting, which is characterized in that: it includes a shaft surface installed on the shaft surface of the shafting part to be tested to feel and transmit the shafting part to be tested The torsional vibration sensor of torsional vibration, the torsional vibration sensor includes a belt drum and an encoder arranged on the belt drum, the output shaft of the belt drum is fixed to the encoder, and The belt drum is connected to the shafting component to be tested through a belt, and the output of the encoder is connected to a signal acquisition instrument, and the signal acquisition instrument is connected to a signal acquisition computer.

Further, it also includes a base for fixing the torsional vibration sensor on the hull, wherein a sliding table that can slide in the base and a sliding table connected to the sliding table are arranged above the base. on the mounting bracket to fix the torsional vibration sensor.

Further, the mounting bracket includes an upper support base and a lower support base arranged perpendicular to each other, a through hole is provided in the middle of the upper support base for the input end of the encoder to pass through, and around the through hole At least one mounting hole for fixing the encoder is respectively provided, and at least one positioning hole for fixing the encoder is also arranged on the lower supporting seat. During installation, after the input end of the encoder is passed through the through hole of the upper support base, the encoder and the belt drum are fixed together on the mounting holes and positioning holes on the upper support base and the lower support base through bolts and nuts.

Further, the input end of the encoder is connected to the belt drum through a flange. The input end of the encoder is connected to the flange through a key, and is effectively fixed by a fixing bolt to prevent relative slippage between the two.

Compared with the prior art, the utility model has the advantage of providing a ship shafting torsional vibration testing device, the belt drum is connected to the shafting components to be tested through a belt, and the torsional vibration signal of the measuring point is realized through the encoder. Accuracy, providing reliable and accurate measuring point data for ship shafting torsional vibration analysis, and at the same time realizing fast acquisition, storage and post-processing of torsional vibration signals on the computer terminal, realizing efficient, convenient and accurate ship shafting torsional vibration testing and It is convenient for the ship performance testing unit, shipyard quality control department, ship inspection and ship owner to inspect and evaluate the operation performance of the main propulsion system of the ship.

Description of drawings

Fig. 1 is the structural representation of ship shafting torsional vibration testing device in the utility model embodiment;

Fig. 2 is a schematic structural view of the torsional vibration sensor in the embodiment of the present invention;

Fig. 3 is the front view of the support seat on the mounting bracket in the embodiment of the utility model;

Fig. 4 is the front view of the support seat under the mounting bracket in the embodiment of the utility model;

Fig. 5 is the front view of mounting bracket in the utility model embodiment;

Fig. 6 is the front view of the flange in the embodiment of the utility model;

Fig. 7 is a schematic diagram of the structure of the belt drum in the embodiment of the present invention.

Detailed ways

The utility model is described in further detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 7, the ship shafting torsional vibration testing device includes a torsional vibration sensor 4 arranged on the shaft surface of the shafting component to be tested for sensing and transmitting the torsional vibration of the shafting component to be tested. The vibration sensor 4 includes a belt reel 43 and an encoder 41 arranged on the belt reel 43, the output shaft of the belt reel 43 is fixed with the encoder 41, and the belt reel 43 is connected to the shaft to be measured by a belt 42. The parts are connected by transmission, the output of the encoder 41 is connected to the signal acquisition instrument 6, and the signal acquisition instrument 6 is connected to the signal acquisition computer 7.

In order to adjust the distance between the torsional vibration sensor 4 and the shafting components to be measured, the device for testing the torsional vibration of the ship shafting also includes a base 1 for fixing the torsional vibration sensor 4 on the hull, wherein the base 1 is provided with a slide table 2 that can slide in the base 1 and a mounting bracket 3 connected to the slide table 2 to fix the torsional vibration sensor 4 . Specifically, the mounting bracket 3 includes an upper support base 31 and a lower support base 32 arranged perpendicularly to each other. The middle part of the upper support base 31 is provided with a through hole 311 for the input end of the encoder 41 to pass through. Four mounting holes 312 for fixing the encoder 41 are provided, and four positioning holes 412 for fixing the encoder 41 are correspondingly provided on the lower support base 32 . During installation, after only the input end of encoder 41 is passed through the through hole 311 of upper support base 31, encoder 41 is fixed on the installation hole 312 and positioning on upper support base 31 and lower support base 32 by bolts and nuts. On the hole 412, and the input end of the encoder 41 is connected with the belt drum 43 through the flange 5.

When this ship shafting torsional vibration testing device is installed, at first the flange 5 and the belt drum 43 are reliably connected by bolts, at the same time, the mounting bracket 3 and the encoder 41 are combined into one by bolts and nuts, and then the encoder 41 The input end and the flange 5 are connected in the form of keys and effectively fixed by fixing bolts to further prevent the relative slippage of the two. Finally, the installation bracket 3 is fixedly installed with the manual sliding table 2 through bolts, and the manual sliding table 2 It is also fixed to the base 1 for installing the belt drum 43 on the hull structure through bolts. After being assembled, it is connected to the torsional vibration signal acquisition instrument 6, and finally connected to the signal acquisition computer 7.

The specific test method includes the following steps:

① Select the position of the torsional vibration measuring point of the ship shafting, install the torsional vibration sensor 4, and adjust the distance between the torsional vibration sensor 4 and the shafting components to be measured through the slide table;

②Connect the torsional vibration signal acquisition instrument 6, connect it to the signal acquisition computer 7, and open the test software to start testing the torsional vibration of the ship shafting; the number of equivalent cycle pulses needs to be calculated, and the calculation formula is

n _g =K _n ×D ₀

In the formula, n _g is the number of equivalent cycle pulses; K _n is the equivalent coefficient, 1/mm; D ₀ is the diameter of the measured shaft, mm, and the equivalent coefficient depends on the structure of the belt pulley and the type of the encoder 41.

③The angular velocity between any two pulses during the shaft rotation can be obtained through the equivalent period pulse number of the encoder in step ②, and the torsional vibration data of the ship shafting can be obtained after the dynamic change of the angular velocity is processed through the pulse signal and data .

In this embodiment, the model selected by the encoder 41 is LF-12BM-C05D, which can generate 120 effective pulses in one cycle, which plays a decisive role in the measurement accuracy.

Claims (4)

1. A device for ship shafting torsional vibration testing, characterized in that: comprise a torsional vibration sensor (4) that is arranged on the shaft surface of the shafting part to be measured for feeling and transmits the torsional vibration of the shafting part to be measured ), the torsional vibration sensor (4) includes a belt drum (43) and an encoder (41) arranged on the belt drum (43), the output shaft of the belt drum (43) It is fixed with the encoder (41), and the belt drum (43) is connected to the shafting part to be measured through a belt (42), and the output of the encoder (41) is connected to the signal acquisition instrument (6), so The signal acquisition instrument (6) is connected to the signal acquisition computer (7). 2. The ship shafting torsional vibration testing device according to claim 1, characterized in that: it also includes a base (1) for fixing the torsional vibration sensor (4) on the hull, wherein the A sliding table (2) that can slide in the base (1) is arranged above the base (1) and is connected to the sliding table (2) to fix the torsional vibration sensor (4) mounting bracket (3). 3. The ship shafting torsional vibration testing device according to claim 2, characterized in that: the mounting bracket (3) includes an upper support seat (31) and a lower support seat (32) arranged vertically to each other, the The middle part of the upper supporting seat (31) is provided with a through hole (311) for the input end of the encoder (41) to pass through, and at least one fixed encoder ( 41), and at least one positioning hole (412) for fixing the encoder (41) is also provided on the lower support base (32). 4. The ship shafting torsional vibration testing device according to claim 3, characterized in that: the input end of the encoder (41) is connected to the belt drum (43) through a flange (5).