JPH0215008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a vibration testing device for use in complex environment tests, etc., which conducts vibration tests under conditions such as predetermined temperature and humidity.

[Conventional technology]

Conventionally, vibration test equipment has been known in which the excitation shaft of the vibration generator protrudes into the constant temperature chamber through a hole in the bottom wall of a fixed constant temperature chamber. It took time and effort to do so, and it was impossible to excite in the horizontal direction. That is, in the conventional invention described in Japanese Patent Publication No. 54-6380, as illustrated in FIGS. c, the lid body d is fitted into this notch c so that it can be freely pulled out in the direction of arrow A, and the vibration axis f of the vibration generator e that protrudes into the thermostatic chamber a is connected to the semicircle of the bottom wall part b. When attaching and removing the specimen j above the vibration axis f by inserting it into the hole i formed by the part g and the semicircular part h of the lid d, move the lid d in the direction of the arrow A.
The work was carried out by pulling out the thermostatic oven A and guiding the wheels of the thermostatic oven A on a rail (not shown) to move the thermostatic oven A in the direction of arrow B.

[Problem to be solved by the invention]

In the conventional vibration testing apparatus, as shown in FIGS. 1 and 2, in order to pull out the lid d in the direction of arrow A,
It has a structure in which the sealing materials k and l corresponding to the front and rear surfaces of the vibration axis f are divided, and the sealing materials k and l correspond to the front and rear surfaces of the vibration axis f.
It has a structure in which it is difficult to make close contact with the excitation axis f, and it has the disadvantage of poor airtightness. In particular, when the excitation axis f moves in and out of a fixed box-shaped constant temperature chamber a during vibration, the volume inside the constant temperature chamber a changes by the product of (cross-sectional area of the excitation axis) x (stroke). As the pressure changes, the joints and lip tips of the plate-shaped sealing materials K and L become loose, causing gas to enter and exit as shown by the broken lines in Figure 1, and the heat insulation effect of the thermostatic chamber a becomes poor.
A major drawback was that the temperature distribution within tank a became non-uniform.

Furthermore, any conventional vibration testing apparatus has the inconvenience of not being able to vibrate the specimen in the oblique or horizontal direction under conditions such as predetermined temperature and humidity.

The present invention solves these conventional drawbacks and
The purpose is to improve the sealing around the vibration axis, reduce pressure fluctuations in the thermostatic chamber, and reduce the weight of the entire device.

[Means to solve the problem]

In order to achieve the above object, the vibration generator according to the first invention has a hole in the bottom wall through which the excitation shaft of the vibration generator is inserted, and a complete circumference sealing material is attached to the hole. At the same time, a top plate is provided in parallel with the bottom wall, the top plate and the bottom wall 7 are connected vertically with a plurality of supports to support the top plate, and can be opened upward. A bellows-shaped surrounding wall is attached to seal the space between the top plate and the bottom wall, a constant temperature chamber is formed by the surrounding wall, the top plate, the bottom wall, and the support, and the specimen is placed in a thermostatic chamber. It is configured to be housed in a constant temperature bath, connected directly or indirectly to the vibration shaft, and to conduct a vibration test under conditions such as predetermined temperature or humidity. In addition, in the second invention, a hole through which the excitation shaft of the vibration generator is inserted is provided in the bottom wall, a complete circumference sealing material is attached to the hole, and a top plate is provided in parallel with the bottom wall. The top plate part and the bottom wall part 7 are connected vertically with a plurality of columns to support the top plate part, and a bellows-shaped surrounding wall body that can be opened upward is attached to the top plate part. and a bottom wall so as to be airtight, and the peripheral wall, the top plate, the bottom wall, and the support form a thermostatic chamber, and the outer container body of the vibration generator is
At a symmetrical position of 180 degrees when viewed from above, it is attached to a guide case via a vibration isolation mechanism, and the guide case is attached to a base so as to be swingable around a horizontal axis, and further, the bottom wall of the thermostatic oven is attached to the guide case. is attached to the guide case with a fixing member, and the vibration generator and the constant temperature chamber are swung together around the horizontal axis, and the vibration test in the diagonal or horizontal direction is performed on the inside of the constant temperature chamber. It is configured to be possible under conditions such as predetermined temperature or humidity.

[Effect]

According to the first and second inventions, by opening the bellows-shaped surrounding wall body upward, the specimen can be directly attached to the vibration shaft. In addition, since the sealed bellows-shaped peripheral wall body is opened upward, the specimen can be attached and detached while the bottom wall portion remains fixed, thereby eliminating the need for a separate sealing material. The bellows-like surrounding wall absorbs pressure fluctuations.

Furthermore, according to the second aspect of the invention, the vibration generator and the constant temperature bath can be oscillated around the horizontal axis to apply vibration to the specimen while maintaining the vibration axis in the diagonal or horizontal direction. Since the vibration isolating mechanism is used, the vibration of the vibration generator is not transmitted to the guide case.

〔Example〕

Examples will be described below with reference to the drawings.

In FIGS. 3 to 5, 1 is a vibration generator, which is of an electrodynamic type or hydraulic type, and 2 is an outer container body having a vibration axis 3 in the vertical direction, A specimen mount 4 is connected to the upper end of the vibration shaft 3, and various specimens 5 are fixed to the mount 4. Reference numeral 6 denotes a constant temperature bath, which is formed into a sealed box shape by a bottom wall portion 7, a top plate portion 8, a bellows-shaped surrounding wall body 9, and the like. A hole 10 through which the vibration shaft 3 is inserted is provided in the bottom wall 7 of the thermostatic chamber 6, and the space between the vibration shaft 3 and the hole 10 is sealed to maintain airtightness. Completely circumferential sealing material 1
1 is attached. A part of the vibration shaft 3, the mounting base 4, and the specimen 5 are placed in the thermostatic chamber 6. Further, reference numerals 15, . . . are a plurality of support columns, which support the top plate portion 8 in parallel with the bottom wall portion 7. Further, the bellows-shaped surrounding wall body 9 has a three-layer bellows main body 12.
is fixed as a suspension from the top plate part 8, and
An annular movable plate 13 is attached to the lower edge of the bellows main body 12, and a sealing material 14 is attached to the lower surface of the movable plate 13. The movable plate 13 has holes 16 through which the pillars 15 are inserted, and the pillars 15 and the holes 16 are fitted to be slidable in the axial direction, and a coil spring is inserted around the pillar 15. 1
The upper and lower ends of the coil spring 17 are connected to the top plate 8 and the movable plate 13, respectively, and always urge the movable plate 13 upward in an elastic manner. 18 is a removable locking mechanism that locks the movable plate 13 to the bottom wall 7, brings the movable plate 13 into contact with the bottom wall 7 via the sealing material 14, and locks the bellows main body 12 into the third Hold it in the stretched state as shown in Figure 4. On the other hand, if the locking mechanism 18 is released by hand, the spring biasing force of the coil spring 17 will cause the locking mechanism to release.
The movable plate 13 is pulled upward as shown in FIG.
The bellows body 12 is in a contracted state. In this way, the bellows-shaped surrounding wall body 9 is configured to be openable upwards, and only the pillars 15 remain as shown in FIG. It can be attached to or removed from the mounting base 4 of 1. After installing the specimen 5, pull down the surrounding wall 9 against the spring 17 and lock it to the bottom wall 7 with the locking mechanism 18, as shown in Figs. 3 and 4. , the constant temperature oven 6 is sealed together with the top plate part 8 and the bottom wall part 7. In addition, the coil spring 17
and a bellows-shaped protective cylinder 19 to protect hands and arms.
The coil spring 17 is covered with.

As shown in FIG.
and are connected to each other through a conduit 21. The atmosphere control device 20 consists of a refrigerator, a heater, a humidifier, a blower, etc., and a constant temperature and humidity control panel. It is detected and input (feedback) to the control panel, and controlled under various conditions.
Moreover, 23 is an air discharge hole, and the air is discharged through the conduit 23. Note that when the entire thermostatic chamber 6 is tilted diagonally or horizontally as described later, the pipe line 21,
23 is made of a flexible material.

Note that the number of bellows bodies 12 is not limited to three and can be increased or decreased, but by forming a plurality of bellows bodies and forming a heat insulating air layer between them, it is easy to keep the atmospheric conditions within the thermostatic chamber 6 constant. becomes.

As shown in FIGS. 5, 6, and 7, one of the plurality of columns 15 15a is rotatably supported on the bottom wall 7, and the remaining columns A locking member 24 is attached to each of the members 15b so as to protrude from the lower end so as to be freely stored, and is normally elastically biased to project downward by an elastic member 25 such as a coil spring. A screw hole 26 is provided in the bottom wall 7 corresponding to the locking tool 24, and a detachment operation handle 28 having a threaded portion 27 is screwed into the screw hole 26 from below, and is engaged with the screw hole 26. In order to push up the locked locking tool 24 using this threaded portion 27, the handle 28 is moved to the seventh position.
If you turn it like the arrow in the figure, you will finally see the locking tool 2.
4 is removed from the screw hole 26, the thermostatic chamber 6 can be rotated around the support column 15a as shown in FIGS. 5 and 6, and the upper part of the mounting base 4 can be largely opened. Therefore, even the specimen 5 which is heavy and has a large volume can be easily mounted on or removed from the mounting base 4 by hanging it with a crane or the like.

Also, as in another specific example shown in FIG.
The locking tool 2 has an operating piece 29 projecting from the lower end of the locking tool 5b.
4, and hold the operating piece 29 with your hand and push it upward against the resilient member 25 to release the locking tool 24.
It is also preferable to adopt a structure in which the engagement with the hole 26a of the bottom wall portion 7 is released.

Next, in FIGS. 3 and 9, 30 is a base installed on the floor, which is, for example, in the form of an inverted gate, and has large diameter circular holes 31, 31. A guide case 32 having a concave inside is attached to this hole 31. Hole 3
The guide cases 32, 32 are pivotably supported around a horizontal axis C, which is the axis of the guide cases 1, 31. Further, the outer container body 2 of the vibration generator 1 is attached to the guide cases 32, 32 via vibration isolation mechanisms 35, 35 consisting of an air spring 33, a guide rod 34, etc. Therefore, the vibration generator 1 can be swung around the horizontal axis C, and can be tilted sideways from diagonally to horizontally as shown in FIG. Of course, a detachable fixing mechanism for fixing in a predetermined posture is separately provided, but is not shown.

Further, the bottom wall portion 7 of the thermostatic oven 6 is attached to the guide case 32 with a fixing member 36, and therefore the thermostatic oven 6 also oscillates around the horizontal axis C integrally with the vibration generator 1. It is configured so that it can be tilted into any position, and vibration testing of the specimen 5 in the diagonal or horizontal direction is also possible. Of course, the atmospheric conditions within the constant temperature bath 6 at this time are controlled to predetermined conditions. In FIG. 9, the specimen 5 is indirectly fixed to the vibration shaft 3 via a mounting jig 37 for horizontal vibration of the specimen.

According to the embodiment of the present invention, the lower end of the support column 15b can be easily and quickly separated from the bottom wall part 7 by the engagement and disengagement mechanism as shown in FIGS.
By rotating the top plate 8 and the surrounding wall 9 that opens upward, the upper part of the vibration shaft 3 of the vibration generator 1 can be opened wide as shown in FIG. It is easy and convenient to attach and detach the large-volume specimen 5. Moreover, after installation, it swings around the pillar 15a and the pillar 1
5b is fixed to the bottom wall part 7 by the tilting mechanism at the lower end, and the bellows-shaped surrounding wall body 9 is pulled downward to quickly seal the thermostatic chamber 6. Under conditions such as predetermined temperature and humidity,
Vibration tests can be performed. In addition, it is possible to form an air insulation layer by using a plurality of bellows bodies 12, and at the same time, the fluctuation in volume (vibration) corresponding to the product of the stroke and cross-sectional area of the vibration shaft 3 during vibration can be made with a flexible material. This can be easily absorbed by the deformation of the bellows main body 12, no air enters or exits from the sealing material 10, and the heat insulating effect of the thermostatic chamber 6 is extremely good. Furthermore, the flexible bellows body 12 absorbs the volume fluctuation (vibration) of the thermostatic chamber 6 mentioned above, eliminates pressure fluctuations, and eliminates the need to make the thermostatic chamber 6 mechanically strong, reducing weight. Accordingly, as shown in FIG. 9, the thermostatic chamber 6 and the vibration generator 1 can be tilted together easily and quickly. (In other words, horizontal vibration is possible.) Note that the present invention is not limited to the illustrated embodiment, and the design can be changed without changing the gist of the invention. In addition to squares and circles, the shape can be various polygons, etc., and the rear wall may be used as a fixed wall part as part of the periphery. Yes, but you are free to increase or decrease the number.

〔Effect of the invention〕

According to the first and second inventions, the following significant effects can be achieved.

When attaching and detaching the specimen 5, there is no need to horizontally move the entire thermostatic chamber 6. That is, since the bellows-shaped surrounding wall 9 can be opened upward, the specimen 5 can be easily and quickly attached and detached while the constant temperature bath 6 remains in the same position.

The vibration shaft 3 is always inserted into the hole 10 of the bottom wall 7 of the thermostatic chamber 6, and the sealing material 11 can reliably seal the entire circumference. Therefore, the constant temperature bath 6 has an excellent heat insulating effect.

Although the vibration of the vibration shaft 3 does not cause pressure fluctuations in the thermostatic chamber 6, the pressure fluctuations are absorbed by the bellows-shaped surrounding wall 9 (preventing air from entering and exiting). Even more airtightness can be maintained,
Excellent heat insulation effect.

The thermostatic chamber 6 can be simplified and lightened.

1000Hz, which poses an occupational health problem and is unpleasant
It can sufficiently block high frequency sounds.

Furthermore, according to the second invention, the following significant effects are further added.

By swinging the vibration generator 1 and the constant temperature chamber 6 together around the horizontal axis C, vibration tests in the tilt direction and the horizontal direction can be easily performed under various temperature and humidity conditions. It became possible.

Vibration isolation mechanisms 35, 35 allow constant temperature chamber 6
The vibrations are not transmitted even to this point, and there is no problem with the durability of the surrounding wall 9 of the bellows-shaped thermostatic chamber 6. In addition, the constant temperature bath 6 can be made lighter and simpler.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing a conventional example, and FIG. 2 is a perspective view of the main part thereof. Fig. 3 is a partially sectional front view showing an embodiment of the present invention, Fig. 4 is a partially sectional side view, Fig. 5 is a sectional front view of the main part in an upwardly open state, and Fig. 6 is an even larger open view. FIG. 7 is an enlarged cross-sectional view of a main part, FIG. 8 is a cross-sectional view of another specific example, and FIG. 9 is a side view showing a state of horizontal vibration. DESCRIPTION OF SYMBOLS 1... Vibration generator, 2... Outer container body, 3... Vibration shaft, 5... Test specimen, 6... Constant temperature chamber, 7... Bottom wall, 8... Top plate, 9... Bellows-shaped surrounding wall body, 10
... Hole, 11 ... Seal material, 15 ... Support column, 3
0...Base, 32...Guide case, 35...Vibration isolation mechanism, 36...Fixing member, C...Horizontal axis.

Claims (1)

[Claims] 1. Hole 1 into which the vibration shaft 3 of the vibration generator 1 is inserted.
0 is opened in the bottom wall part 7, a complete circumference sealing material 11 is attached to the hole part 10, and a top plate part 8 is provided parallel to the bottom wall part 7, and the top plate part 8 and the bottom wall part 7 are connected to each other. are vertically connected by a plurality of columns 15 to support the top plate part 8, and furthermore, a bellows-shaped surrounding wall body 9 that can be opened upwardly.
is attached to seal between the top plate part 8 and the bottom wall part 7, and the surrounding wall body 9, the top plate part 8, the bottom wall part 7 and the support 1
5... forms a constant temperature chamber 6, stores the specimen 5 in the constant temperature chamber 6, connects it directly or indirectly to the vibration shaft 3, and conducts a vibration test under conditions such as predetermined temperature or humidity. A vibration testing device configured to perform. 2 Hole 1 into which the vibration shaft 3 of the vibration generator 1 is inserted
0 is opened in the bottom wall part 7, a complete circumference sealing material 11 is attached to the hole part 10, and a top plate part 8 is provided parallel to the bottom wall part 7, and the top plate part 8 and the bottom wall part 7 are connected to each other. are vertically connected by a plurality of columns 15 to support the top plate part 8, and furthermore, a bellows-shaped surrounding wall body 9 that can be opened upwardly.
is attached to seal between the top plate part 8 and the bottom wall part 7, and the surrounding wall body 9, the top plate part 8, the bottom wall part 7 and the support 1
5... forms a constant temperature bath 6, and furthermore, the outer container body 2 of the vibration generator 1 is placed in a guide case 32, via vibration isolation mechanisms 35, 35 at a symmetrical position of 180 degrees when viewed from above. 32, the guide cases 32, 32 are attached to the base 30 so as to be swingable around the horizontal axis C, and the bottom wall 7 of the thermostatic oven 6 is attached to the guide case 32 with a fixing member 36. After installation, the vibration generator 1 and the thermostatic chamber 6 are swung together around the horizontal axis C, and a vibration test in the diagonal or horizontal direction is performed to maintain a predetermined temperature, humidity, etc. in the thermostatic chamber 6. A vibration test device characterized in that it is configured to be able to perform the test under the following conditions.