KR100492147B1 - Protective part protection device of resistance dynamometer for towing tank test - Google Patents

Abstract

The present invention discloses a novel apparatus for protecting the inspection portion of a resistance dynamometer for towing tank testing.

In order to prevent damage to the force portion due to the application of an unbalance force at the time of non-measurement and to reduce the accuracy, in the present invention, the force portion is installed on the elastic support means and the chucking means, and when the non-measurement is supported on the elastic support means, When the application is cut off and the measurement is performed, the inspection part is fixed by the chucking means to make it measurable.

Description

Protective part protection device of resistance dynamometer for towing tank test

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a towing tank test of model ships, and more particularly, to a power protection unit for a resistance dynamometer.

The ship's main concern for ships is to focus on its capacity, speed and fuel consumption, given sufficient safety and stability, which depends primarily on the linearity below the ship's waterline. . Accordingly, when designing a ship, the linear model ship is towed at a predetermined speed in a towing tank and the resistance is measured to estimate the required engine horsepower of a solid ship.

FIG. 1 illustrates a resistance dynamometer of a towing tank, in which a clamp post P2 and a dynamometer post P1 are arranged back and forth on a frame F of a towing tank that travels on a tank, respectively, from which a support beam B2 is arranged. , B1 extends downward and is provided with a clamp K and an inspection part S at a lower end thereof. Above the posts P1 and P2, geared motors M1 and M2 are respectively provided to adjust the vertical position of the electron beams B1 and B2.

The power section S under the support beam B1 of the dynamometer post P1 has a universal joint in front of the tow bar R by the main test system S1 supported by the support yoke Y. joint to J1), the towing point T of the model line L is coupled to the universal joint J2 in the middle of the tow bar R, and at the rear end of the tow bar R at a balance weight. W) is provided.

On the other hand, the clamp bar (B) is fixed to the model line (L) is selectively gripped and released by the clamp (K).

The role of the clamp (K) is the protection of the power unit (S) during acceleration and deceleration of the towing tank, that is, depending on the size of the tank, but the model ship (L) is quite large (for example, about 8 m in the 400m tank The weight (near 1t in length) has a very large inertial force.The clamp (K) grips the clamp bar (B) during acceleration and deceleration of the towing tank to support all the loads of the model ship (L), and the towing tank is When a certain speed is reached, the clamp bar (B) is released to allow the force part (S) to measure the resistance.

Here, the main force gauge (S1), etc. The pressure gauge is generally composed of a load cell (load cell), as is known, the load cell is attached to one or more strain gauges (strain guage) on the workpiece of a type suitable for measuring the cylindrical bar (bar) It is designed to measure the load by converting the deformation into an electrical signal through strain gauge using the principle that the load and strain change linearly within the elastic range of the workpiece.

However, if the cross section of the measurement object is excessive, the capacity of the load cell increases but the sensitivity decreases. On the contrary, if the cross section decreases, the sensitivity, that is, the accuracy is improved, but the capacity, i.e., the measurable range, becomes smaller due to the decrease in the load. do.

Since the towing test of the model ship L is a similarity test to the solid ship, the precision of the model ship L should be very high. Accordingly, the load cell constituting the main hysterometer S1 is also within the range of the predicted load. You must use a high precision one.

However, the problem of the conventional resistance dynamometer is that the relative position of the clamp (K) and the inspection unit (S), in particular the main inspection system (S1) and the towing point (T) is fixed, it is difficult to accurately set the clamp (K), Accordingly, an unbalanced force may be applied to the inspection part S even when the clamp K is gripped. This unbalance force increases as the model line L is towed at high speed.

The inspection part S has a considerable precision for performing the similarity test. Thus, the excessive unbalance may cause the main inspection system S1 of the inspection part S to deteriorate or damage the accuracy. There is.

Accordingly, it is an object of the present invention to provide a protective device that prevents excessive force from being applied to the inspection section during non-measurement of the inspection section, ie, when holding the clamp, in a high speed towing test.

The protection device of the present invention to achieve the above object

Elastic support means for elastically supporting the non-measurement of the arm,

It is characterized in that it comprises a chucking means for fixing it when measuring the force portion.

According to this configuration, the clamping portion is elastically supported at the time of non-measurement of the clamp, so that if the force is not applied to the clamping portion, it is fixed by the chucking means only at the time of measurement and the measurement can be made.

EXAMPLE

Such specific features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

2 to 3, the main force unit S1 is supported by a guide block 1 on the support plate 2 of the force unit S coupled to the lower end of the support beam B1 of FIG. 1. On both sides of the support plate 2, two actuators 3 constituting chucking means are provided.

Preferably the main force unit (S1) is installed on the guide means for guiding the movement in the front and rear direction, that is, the traveling direction of the towing device, for this purpose at least one between the two actuators 3, preferably two guide rods ( 4) extends, the guide rod 4 penetrates through the guide holes 5 formed on both sides of the guide block 1, and the main inspection force S1 is guided in the front-rear direction.

Preferably, the two actuators 3 each consist of a pneumatic cylinder, the tip of which between the operation 3a becomes the fixing part 6 to contact the fixing groove 7 formed in the guide block 1. As a result, the guide block 1 is chucked.

The elastic support means of the detecting part S1 is composed of a coil spring 8 provided in this operation period 3a, and then the operation period 3a of both actuators 3 as shown in FIG. In the degenerate state of the guide block (1) is supported by the main force unit (S1) is elastically supported by both coil springs (8), the application of external force is blocked, the operation period 3a as shown in Fig. 3 (B) When the drawing is stretched, the fixing part 6 of the tip contacts the fixing groove 7 of the guide block 1 and chucks the guide block 1 so that the main inspection part S1 is fixed and measurable. do.

In this configuration, since the chucking is made only at the center of the guide block 1, when the large resistance is applied, the main inspection portion S1 may be slightly twisted in the left and right directions.

Accordingly, more preferably, both guide means are provided with auxiliary chucking means, and taper grooves 9 are formed at the ends of both guide holes 5, and the operation of each actuator 3 ( In 3a), the operating plate 11 is extended, and split collets 10 corresponding to the respective tapered grooves 9 are respectively installed.

Then, the split collet 10 enters the tapered groove 9 in the stretched state between the operations 3a, thereby closing the divided part and tightening the guide rod 4 so that the chucking in a more stable and right and left equilibrium state is achieved. do.

The chucking means of the present invention is operated alternately with the clamp (K), that is, when the towing and deceleration of the towing vehicle, the towing resistance of the clamp (K) grips the clamp bar (B) of the model ship (L) In this case, the force unit S1 is supported by the coil spring 8, which is an elastic support means, so that an excessive unbalance force is not applied. On the other hand, when the towing vehicle reaches a constant speed, the clamp K is released, and the chucking means fixes the inspection unit S to set it to a measurable state.

According to the present invention having the above-described configuration, the inspection unit can measure the accurate towing resistance, and at the same time block the application of excessive unbalance force at the time of non-measurement to prevent unnecessary deformation or damage of the inspection unit to improve the precision of the resistance dynamometer Maintenance and prolong its service life.

1 is a side view showing the installation of a resistance dynamometer for a model ship in a towing tank;

2 is a side view of the protection unit of the present invention,

3 (A) and (B) are sequential plan cross-sectional views showing the operation.

* Explanation of symbols for main parts of the drawings

S: Test part S1: Main tester

1: guide block 5: guide hole

7: fixing groove 9: taper groove

3: actuator 3a: between operations

6: fixing part 4: guide rod

8: coil spring 10: split collet

11: operating plate

Claims (8)

In the resistance dynamometer for a towing tank test, in which a clamp and an inspection part are installed in each support beam supported by a post installed in a frame of a towing tank, Elastic support means for elastically supporting the force unit when it is not measured; The thrust protection device of the resistance dynamometer for a towing tank test, characterized in that it comprises a chucking means for fixing it when measuring the thrust portion. The method of claim 1, And a main inspection system supported by a guide block positioned on a support plate coupled to the support beam. The method according to any one of claims 1 to 2, The chucking means has a fixed part of the tip between the operation of the two actuators provided on both sides of the support plate, and corresponding to the safety of the resistance of the resistance dynamometer for towing tank test, characterized in that it has a fixing groove formed on both sides of the guide block Device. The method of claim 3, wherein And the elastic support means is provided with a coil spring provided between the operation of the two actuators and the guide block. The method of claim 1, And a guide means for guiding the detection unit in the running direction of the towing tank. The method of claim 5, wherein And the guide means includes a guide rod extending between the two actuators, and a guide hole formed in the guide block and through which the guide rod penetrates. The method of claim 6, The guide rod and the guide hole are provided on both sides of the guide block, the power unit protection device of the resistance dynamometer for a towing tank test. The method of claim 6, The chucking means includes a taper groove formed at an end of the guide hole of the guide block, and a split collet provided on an operation plate provided between the operation of the actuator to correspond to the taper groove. Armor protection device.

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