JPH0334670Y2 - - Google Patents

Description

[Detailed Description of the Invention] 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.

Conventionally, as this type of apparatus, one in which only the test object is placed in a constant temperature bath is known. but,
A connecting shaft is required to connect the vibration generator and the test object, and this connecting shaft protrudes into the thermostatic chamber through a hole in the bottom wall of the thermostatic chamber. In other words, as illustrated in Figs. 1 and 2, a box-shaped thermostat a
A notch c is formed in the bottom wall b of the holder, and a lid d is removably fitted into the notch c as shown by arrows A and B.
Connecting shaft g of vibration generator e protruding into thermostatic chamber a
is inserted into the hole j formed by the semicircular part h of the bottom wall part b and the semicircular part i of the lid body d, and the test object n is attached above the connecting shaft g. is configured. To attach and detach the test object n, remove the lid d in the direction of the arrow B, guide the lower wheels of the thermostatic chamber a on a rail (not shown), and move the thermostatic chamber a in the direction of the arrow C. I was working on it. However, in this case, the connecting shaft g needs to have a length (T+L) that is at least the sum of the wall thickness T of the bottom wall b of the thermostatic chamber a and the maximum excitation displacement dimension L of the connecting shaft g. The combined spring constant K of the vibration table p and the connection shaft g is K≒AE/l A: average cross-sectional area of the vibration table p and the connection shaft g l: length of the connection shaft g E: Young's modulus, The natural frequency fn is expressed as: fn≒1/2π√980 K: Spring constant W: Weight of the vibration table P and the connecting shaft g, which is reduced. the result,
There has been a problem in that the vibration characteristics are significantly deteriorated due to a decrease in the upper limit frequency for use and an increase in the necessary excitation force due to an increase in the excitation mass.

It is an object of the present invention to solve these problems and provide a vibration testing device that has a high usable upper limit frequency, reduces the required excitation force, and has excellent performance and energy saving effects. Therefore, the feature of the present invention is that a flexible cover material made of a heat insulating material containing a vibration generator equipped with a vibration table is housed inside a thermostatic oven, and A flexible top plate made of a heat insulating material is provided on the cover material and is held between the test object stored in the holder and the vibration table of the vibration generator, and an electric heater is provided on the inner surface of the cover material. The point is to install a vibration tester and conduct a vibration test at a specified temperature or under conditions such as temperature.

Hereinafter, the present invention will be explained in detail based on the illustrated embodiments.

In FIG. 3, 1 is a vibration generator of an electrodynamic type, 2 is its outer container body, and 3 is a vibration table. The vibration table 3 protrudes from the upper surface of the outer container body 2 via a fixing portion 4 that projects upwardly from the inner bottom surface of the outer container body 2, and is capable of reciprocating in the direction of the axis D. It is held by a support device (not shown) as shown in FIG. Specifically, the vibration table 3 has a movable part coil 5 that is inserted from above into a gap 19 between the outer container body 2 and the fixed part 4, and a movable part coil 5 that is inserted into a gap 19 between the outer container body 2 and the fixed part 4. By supplying alternating electricity to the movable part coil 5, it vibrates back and forth in the vertical direction.

Reference numeral 6 denotes a heat insulating cover material that houses the vibration generator 1 as an internal component, and as shown in the figure, a self-temperature control type electric heater 7 is attached to the inner surface of the cover material 6.

In addition, the cover material 6 includes a top plate portion 1 made of a heat insulating material.
0 is set. The cover material 6 and the top plate portion 10 are made of a flexible material that can sufficiently withstand the vibrations of the vibration table 3.

Reference numeral 8 denotes a box-shaped constant temperature chamber, and a door (not shown) is pivotally attached to the front surface of the chamber so that it can be opened and closed, and a test object 9 detachably fixed to the upper part of the vibration table 3 can be taken in and out. As shown in the figure, the test object 9 is fixed to the vibration table 3 through the center of the top plate part 10 of the cover material 6 via a mounting jig (not shown). In this way, the test object 9 and the vibration table 3 are connected to the top plate part 10.
is held in place.

Thus, the vibration generator 1 with the test object 9 fixed to the upper part thereof is housed in the constant temperature chamber 8, and a vibration test is performed under conditions such as predetermined temperature and humidity.

Reference numeral 11 denotes a feed pipe for feeding cooling air for cooling the movable part coil 5, and the feed pipe 11 is loosely fitted into a hole 12 formed in the side wall of the thermostatic oven 8. A blower 13 disposed outside the thermostatic chamber 8 is connected to one end of the feed pipe 11, and a connecting pipe 15 fitted into a hole 14 formed on the side surface of the outer container body 2 is connected to the other end. The outer container body 2 and the blower 13 are connected to each other, and cooling air is sent into the outer container body 2.

Reference numeral 16 denotes a discharge pipe for discharging the air circulating inside the outer container body 2 and the cover material 6 to the outside, and is fitted externally to the inlet pipe 11, and one end is fitted into the hole 12. and the other end is the cover material 6
Connecting pipe 1 fitted into hole 17 opened in the side plate of
5, the inside of the cover material 6 and the outside of the thermostatic chamber 8 are connected in communication, and the air sent from the blower 13 is discharged to the outside.

Therefore, the inlet pipe 11 and the discharge pipe 16 are concentric with each other.
A layered channel 18 is configured. The cooling air introduced into the outer container body 2 from the inlet pipe 11 cools the movable coil 5, passes through the cover material 6, and is discharged to the outside of the thermostatic chamber 8 from the discharge pipe 16. The air passing through the cover material 6 is heated by an electric heater 7...
When the test environment inside the thermostatic chamber 8 is at a low temperature, condensation on the inner surface of the cover material 6 and inside the vibration generator 1 is prevented.

Note that the present invention is not limited to the illustrated embodiment; for example, it is preferable to use a hydraulic type as the vibration generator 1.

According to the effects of the illustrated embodiment of the present invention, the flow path 1
8 has a concentric double structure so that the inlet pipe 11 is not directly influenced by the constant temperature chamber 8, and the inlet pipe 11 and the outlet pipe 16 are arranged vertically at a predetermined interval. In comparison, the movable part coil 5 can be sufficiently cooled and the structure is simple.
Furthermore, the self-temperature-controlled electric heater 7... has a resistance value that suddenly changes at a predetermined temperature without using a thermostat, and is automatically turned on and off, thereby simplifying the structure.

The present invention has effectively achieved the intended purpose with the configuration detailed above. In particular, the vibration generator 1 and the test object 9
are housed together in a thermostatic chamber 8, and therefore, as shown in FIG. 1 and FIG. Compared to other devices, the existing thermostatic oven can be used as is since there is no need to create a hole j in the bottom wall b of the thermostatic oven a or to form a notch c to fit the lid d. becomes. In addition, in the conventional type, a connecting shaft g is required to have a length dimension (T+L) that is the sum of the maximum excitation displacement dimension L of the connecting shaft f to the wall thickness dimension T of the bottom wall b of the thermostatic chamber a. However, in the present invention, this length dimension (T + L) can be reduced, and the natural frequency fn is therefore increased, resulting in a device with improved performance with a high upper limit frequency for use, and the required excitation force is reduced. As a result, power consumption can be suppressed, resulting in excellent energy-saving effects. Furthermore, there is no need to engage or disengage the lid d in the directions of arrows A and B as in the past, and there is no need for split sealing members q and r facing the front and rear surfaces of the connecting shaft g. There is no problem of poor airtightness in the sealing part, and the insulation effect is excellent. In addition, since the vibration generator 1 is surrounded by the cover material 6 made of heat insulating material and stored in the thermostatic oven 8, it is possible to reliably prevent dew condensation inside the vibration generator 1 (the thermostatic oven 8 is kept at a low temperature). ), it is also possible to prevent an adverse effect on the vibration generator 1 when the constant temperature chamber 8 is kept at a constant temperature. Furthermore, since the electric heaters 7 are attached to the inner surface of the cover material 6, the temperature of the air circulating through the cover material 6 can be adjusted, and dew condensation on the inner surface of the cover material 6 and inside the vibration generator 1 is prevented. In this way, it is a device that has great practical effects.

[Brief explanation of the drawing]

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 sectional front view showing an embodiment of the present invention. 1... Vibration generator, 3... Vibration table, 6... Cover material, 7... Electric heater, 8... Constant temperature chamber, 9...
...Test object.

Claims (1)

[Scope of utility model registration request] A flexible cover material 6 made of a heat insulating material houses a vibration generator 1 equipped with a vibration table 3 as an internal structure.
A flexible top plate part 10 made of a heat insulating material is housed in a constant temperature bath 8 and is held between the test object 9 housed in the constant temperature bath 8 and the vibration table 3 of the vibration generator 1. is provided on the cover material 6, and an electric heater 7 is attached to the inner surface of the cover material 6, and the vibration test is conducted under conditions such as predetermined temperature or humidity. Device.