JPH06138016A - Heat aging test device - Google Patents

Abstract

PURPOSE:To provide a device the nonconformity of which is improved and the measuring accuracy and workability of which are remarkably advanced. CONSTITUTION:In this device, the inside of a sectionally box-form thermostatic chamber 1 having a specified spacial volume with a door 1a is partitioned into two parts by a partition plate 3 with a plurality of holes 2 for supporting holders, in the about middle thereof, and a thermostatic chamber 5 for keeping holders warm, having a heating means in the upper part and a precision thermostatic chamber 7 having a heating means in the lower part are respectively formed. An outside air intake means 12 is connected to the lower part of the heating means of the chamber 7, and the means 12 feeds the taken-in outside air into the lower part of the heating means of the chamber 7 through an air filter 13 and a supply pipe 14. Bottom parts of a plurality of cylindrical holders 11 removably fitted and vertically set on holes 2 are opened, and exhaust ports are provided at the centers of the upper surfaces thereof. One touch joints 28 for connecting with pipes 27, provided with flowmeters 25 and flow control valves 26 are provided to the exhaust ports respectively, and a collecting pipe 29 is connected to an exhaust collecting body 31 on the thermostatic chamber 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for testing a phenomenon that a rubber test piece (vulcanized rubber), which is a main product of a product, changes (decreases) with time due to the influence of heat and oxygen. In particular, the present invention relates to a heat aging test device for heating a rubber test piece at a specified temperature for a specified time by using a cell type oven.

[0002]

2. Description of the Related Art Conventionally, a rubber test piece (vulcanized rubber), which is the main component of a product, is a device for testing the phenomenon that the physical properties of rubber change (decrease) with time due to the influence of heat and oxygen, that is, heat aging As a test device, JIS K6301 and ISO 188,
The type of device is regulated. JIS K6301 and above
The types of equipment regulated by ISO 188 are the gear-type aging test device, test tube-type aging test device, cell-type aging test device, and pressurized oxygen aging test device. Each of these heat aging test devices has its own characteristics as a test method, but has a problem on the other hand.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention For example, in a gear type aging tester, the test tube is easily affected by volatile components (antiaging agent, oil, wax, plasticizer, etc.) generated from each other's test pieces. The aging test apparatus has a problem in that the air is not accurately replaced and the temperature of the air entering the tube is room temperature, resulting in poor measurement accuracy. In addition, the test tube type aging test device, the cell type aging test device, and the pressurized oxygen type aging test device have poor workability in measurement, and the pressurized oxygen type aging test device has a further safety problem. However, the conventional heat aging test device has some problems.

A so-called heat aging tester is JIS K6.
Its structure is roughly specified in 301 and ISO 188. For example, in the cell aging tester, it consists of a cylindrical vertical cell and a heating device, and the cell (holder for the test piece) has a height of 300 mm or more. The size of the test piece placed in the cell must be 10% or less of the cell volume. The heating device is a medium with good thermal conductivity (for example,
Enclose the cell with an aluminum block, liquid bath, saturated steam, etc.), so that the temperature of the test piece in the cell can be maintained uniformly within the specified temperature range of 70 ℃ to 200 ℃, temperature control and temperature measurement. It must be equipped with a device.

Further, the air in the cell is gently replaced at a rate of 3 to 10 times per hour, and the temperature of the incoming air is controlled to be within ± 1 ° C. of the specified temperature at the inlet of the cell. There must be. It also states that air that has passed through one cell must not enter the other cells and that copper and copper alloys must not be used to make these vessels.

The present invention has been devised in view of the above-mentioned conventional problems, and while respecting the configuration of the cell-type aging tester defined by JIS K6301 and ISO 188, the conventional cell-type aging test is performed. The object of the present invention is to provide a heat aging test device which can improve the measurement accuracy and can remarkably improve the workability of the measurement by improving the trouble of the test device.

[0007]

In order to achieve the above object, the present invention provides a heating means in the upper part of a thermostat having a predetermined space volume through a partition plate having a plurality of holder supporting holes. It is divided into upper and lower compartments with a holder thermostat and a precision thermostat with heating means at the bottom, and external air intake means is connected to the precision thermostat, and it is attached to and detached from the holder support hole formed in the partition plate. A plurality of cylindrical holders that are erected so as to be erected so that the bottom portion is open, an exhaust port is provided at the center of the upper surface, and a suspension means capable of suspending a predetermined number of test pieces is provided inside the holder. The gist is that the exhaust port provided in the center of the upper surface of each of the cylindrical holders can be connected to the exhaust means via the flow rate adjusting means.

[0008]

The present invention is constructed as described above, and a plurality of cylindrical holders in which a predetermined number of test pieces are hung are vertically set up in a holder heat-retaining constant-temperature chamber in which the constant-temperature chamber is divided. ,
Heated air at a specified temperature from the precision thermostatic chamber is introduced into the holder through the bottom opening of each holder, and the air is exhausted from the exhaust port provided in the center of the upper surface of the holder through the flow rate adjusting means to the air outlet 3 times per hour. By evacuating and controlling so that it is replaced gently every 10 times, it is possible to always perform highly accurate measurements and improve workability.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a heat aging test apparatus embodying the present invention, and FIG. 2 is a vertical sectional front view of the heat aging test apparatus. This heat aging test apparatus has a box-shaped door 1a having a predetermined space volume. A substantially constant center in a constant temperature bath 1 having a holder heat insulating constant temperature bath 5 having a heating means 4 at an upper part and a heating means 6 at a lower part through a partition plate 3 having a plurality of holder supporting holes 2. It is divided into upper and lower parts with the precision constant temperature bath 7 provided.

As shown in FIG. 2, the heating means 4 of the holder thermostat bath 5 and the heating means 6 of the precision thermostat bath 7 have heaters 8a, 8b and a stirring blade rotated by a motor 9 on the side of the bath. 10a and 10b, heated air A in the holder temperature-controlled thermostatic chamber 5 and the precision thermostatic chamber 7 circulates in the direction of the arrow, and heated air A in the precision thermostatic chamber 7
A part of the gas flows into the cylindrical holder 11 which is erected on the holder supporting hole 2 of the partition plate 3.

An outside air intake means 12 is connected to the lower portion of the heating means 6 of the precision constant temperature tank 7, and the outside air intake means 12 takes in the outside air X taken in from the outside of the tank to an air cleaning filter 13, a supply pipe 14 and a preheater. It is configured to be fed to the lower part of the heating means 6 of the precision constant temperature bath 7 via the device 8c. That is, the air sent into the precision thermostatic chamber 7 needs to be cleaned so as not to adversely affect the measurement accuracy, and therefore, the polluted gas and impurities contained in the outside air X, and the vaporized addition from the test piece. The agents, decomposed products, etc. are cleaned through a plurality of layers of air cleaning filters 13 of physical adsorbent, neutralizing absorbent, catalyst absorbent, and the cleaned air is sucked by the stirring blade 10b of the heating means 6. ,
Further, after the temperature is adjusted to the set temperature by the heater 8b, it is fed into the precision constant temperature bath 7.

Further, by installing a preheating device 8c behind the air cleaning filter 13, the outside air X taken in from the outside of the tank is preheated to a constant temperature and the preheated air is adjusted in the precision constant temperature tank 7. It is possible to further improve the accuracy of the temperature inside the tank by feeding it into the tank. In addition,
Reference numerals 15a and 15b denote partition walls of the holder temperature maintaining thermostat 5, the heating means 4, and the precision thermostat 7 and the heating means 6.

Next, as shown in FIG. 3, a plurality of cylindrical holders (cells) 11 which are detachably engaged and stand upright on the holder supporting holes 2 formed in the partition plate 3 are made of glass. Alternatively, it is formed in a cylindrical shape from a corrosion resistant material such as stainless steel, the bottom 11a is open, and the exhaust port 16 is provided at the center of the upper surface 11b. Also, on the side surface of the holder 11,
A door 17 for loading / unloading the test piece W into / from the holder 11 is attached via a packing 17a so as to be openable / closable.
Suspension means 19 such as pins for suspending a predetermined number of test pieces W via hooks 18 and the like are provided on the inner wall surface of the. In addition, 20 has shown the set screw of the door 17.

Further, hooks 22 for supporting the holder 11 on a rack 21 to be described later are attached at symmetrical positions on the upper side surface of the holder 11. Also, the bottom portion 1 of the holder 11
It is possible to attach a hole cover 23 as shown in FIG. 3 to the 1a in order to fill a gap with the holder supporting hole 2 formed in the partition plate 3. Further, in the above example,
Although only a plurality of holder supporting holes 2 are formed in the partition plate 3 that divides the holder heat-retaining constant temperature tank 5 and the precision constant-temperature tank 7, the holder heat-retaining constant-temperature tank 5 and the precision constant-temperature tank 7 are not always required.
It is not necessary to configure and in an airtight manner, as shown in FIG.
It is also possible to form a plurality of punching holes 24 in the partition plate 3. In this way, by forming a plurality of punching holes 24 in the partition plate 3, it is possible to make the holder constant temperature oven 5 and the precision constant temperature bath 7 the same bath as the entire precision thermostatic bath. In this case, it is necessary to synchronize the heaters 8a and 8b.

A one-touch joint 2 for connecting a flow meter 25 and a pipe 27 equipped with a flow rate adjusting valve 26 to the exhaust port 16 provided at the center of the upper surface of each of the cylindrical holders 11.
8 are provided respectively, and the pipe 27 is a collective pipe 2
9 is connected to a box-shaped exhaust assembly 31 of an exhaust means 30 provided at the upper part of the constant temperature bath 1, and the exhaust gas collected in the exhaust assembly 31 is sequentially exhausted to the outside of the bath via an exhaust pump 32. It is something.

The plurality of holders 11 held in the holder heat-retaining constant temperature tank 5 through the partition plate 3 having the hole 2 for supporting the holder include a plurality of holders 11 having the holder heat-retaining constant temperature tank 5.
It is configured so that it can be taken in and out at the same time. That is, as shown in FIG. 4 and FIG. 5, a hook 22 provided at a symmetrical position on the upper side surface of the holder 11 engages at a position where the upper frame 33a of the rack 21 formed in a frame shape is opposed to each other. A locking portion 34 is provided, and the holder 11 is inserted from the upper portion of the rack 21 to hook the hook 22 into the concave locking portion 34.
, So that the holder 11 is supported vertically. Further, rails 3 installed in the holder temperature maintaining bath 5 are provided at the front and rear portions of the lower frame 33b of the rack 21.
Guides 36a, 36 that slide along 5a, 35b
b is integrally attached to the rails 35a and 35b,
The guides 36a and 36b are engaged with each other to form a mountain-shaped notch recess 37 for stopping and holding the rack 21 at a predetermined position.
a and 37b are formed.

As shown in FIG. 5, the height positions of the mountain-shaped notch recesses 37a and 37b formed on the rails 35a and 35b are the bottom 11a of the holder 11 until the guides 36a and 36b of the rack 21 are engaged. Is located on the partition plate 3, and the guide 3 of the rack 21 is provided in the cutout recesses 37a and 37b.
When the 6a and 36b are engaged, the bottom portion 11a of the holder 11 is formed so as to fall into the holder supporting hole 2 of the partition plate 3 to be fitted therein.

As described above, by using the rack 21 capable of supporting a plurality of holders 11, the holders 11 accommodating a plurality of test pieces W can be simultaneously put in and taken out from the holder heat-retaining constant temperature bath 5. The setup time for mounting and removing the test piece W can be shortened and the workability can be improved. Further, as shown in FIGS. 7 and 8, a plurality of holders 11x, 11y, 11z (three in this embodiment) are connected to each other by a holder connecting plate 40, and a plurality of holders 11x, 11y, 11z are formed.
By making it possible to take z in and out of the holder temperature maintaining thermostat 5 at the same time by using the rack 21, it is possible to further shorten the setup time.

In the above embodiment, the holder 11 is divided into individual pieces, but it is also possible to use a honeycomb cylindrical block. The embodiment of the present invention is configured as described above, and as a test method, the holder 11 containing a plurality of test pieces W so that the volume of the holder 11 is 10% or less is held via the rack 21. The test piece is set in the thermostat bath 5 and the door 1a is closed to start the test.

The air sent into the precision thermostatic chamber 7 is cleaned through the air cleaning filter 13, and the cleaned air is preheated by the preheating device 8c and then by the stirring blade 10b of the heating means 6. After being sucked and further adjusted to a preset temperature by the heater 8b, it is fed into the precision constant temperature bath 7. The heated air A sent in circulates in the direction of the arrow, and a part of the heated air A is part of the partition plate 3
The test pieces W in the holder 11 are heated at a prescribed temperature for a prescribed time by flowing into the cylindrical holder 11 provided upright on the holder supporting hole 2.

The temperature of the heating means 6 is controlled so that the temperature of the air flowing into the holder 11 becomes ± 1 ° C., which is the specified temperature, at the inlet of the holder 11. On the other hand, the holder 11 itself is also controlled in a state where it is heated to a specified temperature by the heated air A circulating in the holder temperature-controlled thermostatic chamber 5. The operation of the flow meter 25 and the flow rate adjusting valve 26 is set so that the air in the holder 11 is gently replaced at a rate of 3 to 10 times per hour depending on the number of test pieces W, and exhaust gas is sucked and exhausted. It is collected in the body 31 and sequentially discharged to the outside of the tank via the exhaust pump 32.

When the heating test of the test piece W is completed, the door 1a
Rack 2 that opens to support multiple holders 11
1 is taken out while sliding along the rails 35a and 35b, the holder 11 is removed from the rack 21, and
The door 17 of the holder 11 is opened, the test piece W is taken out, and the test is completed. The heated test piece W taken out is tested for various properties such as tensile strength, elongation at break, tensile stress, hardness, etc. by another testing machine. By performing the test by the above method, the measurement accuracy can be improved and the measurement work can be performed efficiently.

[0023]

As described above, according to the present invention, the inside of the constant temperature oven having a predetermined space volume as described above is provided with the heating means at the upper portion of the holder temperature keeping oven through the partition plate having a plurality of holder supporting holes. And a precision thermostat with a heating means at the bottom to form a compartment and connect the outside air intake means to the precision thermostat,
A plurality of cylindrical holders that are detachably engaged with the holder supporting holes formed in the partition plate and stand upright are provided with a bottom opening, an exhaust port at the center of the upper surface, and a predetermined number of test pieces inside. Since the suspension means that can be suspended is provided and the exhaust port provided at the center of the upper surface of each cylindrical holder can be connected to the exhaust means via the flow rate adjusting means,
While adhering to the configuration of the cell-type aging tester specified by K6301 and ISO 188, it is possible to improve the measurement accuracy and improve the defects of the conventional cell-type aging tester. There is an effect that can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat aging test apparatus embodying the present invention.

FIG. 2 is a vertical sectional front view of a heat aging test apparatus embodying the present invention.

FIG. 3 is a perspective view of a holder with a door opened.

FIG. 4 is a perspective view of a rack in which holders are suspended.

FIG. 5 is an operation explanatory diagram of a rack and a holder that are taken in and out of a constant temperature bath.

FIG. 6 is a perspective view of a partition plate in the case where the inside of the constant temperature bath is made into a precision constant temperature bath without making a distinction between a holder warming constant temperature bath and a precision constant temperature bath.

FIG. 7 is a perspective view showing another embodiment in which a plurality of holders are connected to each other by a holder connecting plate.

FIG. 8 is a plan view of a plurality of holders in which a plurality of holders are connected to each other by a holder connecting plate.

[Explanation of symbols]

1 Constant Temperature Chamber 2 Holder Support Hole 3 Partition Plate 4 Heating Means 5 Holder Insulation Constant Temperature Chamber 6 Heating Means 7 Precision Constant Temperature Chamber 8a, 8b Heater 11 Holder 12 Outside Air Intake Means 13 Air Purification Filter 14 Supply Pipe 16 Exhaust Port 18 Hook 19 Suspension Means 25 Flowmeter 26 Flow rate adjusting valve 27 Pipe 28 One-touch joint 29 Collecting pipe 30 Exhaust means 31 Exhaust aggregate 32 Exhaust pump W Test piece

Claims (2)

[Claims] 1. A thermostat having a predetermined space volume is provided with a holder thermostat having a heating means in the upper part and a heating means in the lower part through a partition plate having a plurality of holes for supporting the holder. A plurality of cylindrical tubes that are vertically divided into a precision thermostat and connected to the precision thermostat with outside air intake means and detachably engaged with holder supporting holes formed in the partition plate. The holder has an opening at the bottom, an exhaust port at the center of the upper surface, and a suspension means capable of suspending a predetermined number of test pieces inside. The exhaust port is provided at the center of the upper surface of each cylindrical holder. The heat aging test apparatus is characterized in that it can be connected to the exhaust means via the flow rate adjusting means. 2. A precision thermostatic bath according to claim 1, wherein the partition plate is provided with a plurality of holder supporting holes and a plurality of punching holes, and the constant temperature baths which are vertically partitioned through the partition plate are precision thermostatic baths. Heat aging tester.