JPS62144047A - Promotional weathering tester having rotary contact apparatus - Google Patents

Abstract

PURPOSE:To enable a long-time and stable measurement with a longer life by a promotional weathering tester having a rotary contact unit, by providing a conical roller bearing as relay contact of a contact unit and to turn this to a rotary contact by injecting a conductive grease containing a conductive powder such as carbon powder. CONSTITUTION:A sample rotating frame turning around a light source provided in a testing tank is provided with a black panel thermosensitive section, a light receiving section, and a sensing section such as temperature sensing element, it is made to communicate with a contact unit 41 through a rotary shaft 14 and a signal from the sensing section is fetched from the contact unit 41 through a lead 35 to be transmitted to a measuring section or the like. A conical roller bearing 26 is used as relay contact of the contact unit 41 and combined with a fixed bearing 26a, mobile bearing 26b as a pair through a spring 44. A grease blended with a conductive powdery body such as carbon powder in a base oil, silver powder or copper powder is previously injected into the conical roller bearing 26 and a signal is fetched outside through a lead 39 at a terminal 37 of an external bearing 30.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an accelerated weathering tester having a rotating contact arrangement.

Conventional technology-enhanced weathering testers are only capable of testing the 1llFl weatherability of any material, and the irradiance applied to the material,
Temperature is an important factor in testing,
These for a long time 1] (If it is exactly 411 constant, the table is small,
have to adjust.

A conventional technique related to an accelerated weathering tester having this sliding contact device will be explained based on the drawings.

FIG. 7 is a side sectional view of the same.
I! on the insulating rotating shaft 16 of the sliding contact device. l! tied.

17 is the case, this center! - The rotating shaft 16 is supported by the lower bearing 18.

A disc 1; a sliding contact 19 is attached to the rotating shaft 16, and a seat vj35 from a detector or the like that rotates once is connected to the disc-shaped sliding contact 19.

A black contact 20 made of silver or the like is supported by a contact case 21 attached to the outer circumferential surface of the case 17, and its tip is pressed against the outer circumferential surface of the sliding contact 19 by the force of a spring 22.

23 is a lead wire attached to the contact black 20, and the other end is connected to the terminal 24 of the contact case 21.

The signal taken out to the outside is from this terminal 24 to the RI-I line 3.
9, and is connected to a total Δlit section installed outside.

With such a structure and configuration, a signal from a rotating detector etc. is transmitted through a disc-shaped sliding contact 19 that rotates through a rotating shaft 14.
The outer circumferential surface is constantly sliding against the fixed contact black 20 that comes into contact with it due to rotation, so the signal passes through that contact portion and reaches the fixed contact black 20. The metal is taken out to the outside.

or! The invention of 1987-81929 proposed an accelerated weathering tester having a rotating contact device consisting of a ball bearing instead of a sliding contact device, as shown in FIG.

Problems to be Solved by the Invention In the accelerated weathering tester, the sample is exposed to radiation from a light source, and the test temperature is determined by the temperature of the black panel at the same position as the sample. deteriorates over time. Therefore, the irradiance of the test surface and the test temperature of 1 u degrees are very important factors.

11 μchi sunshine carbon arc lamp type promotion l1l)
Taking the sample tester as an example, the test conditions are: (a) Temperature of the black panel on the test surface = 63 ± 3°C (b) Irradiance on the sample surface: 255 ± 45 W/m'. There is.

Conventionally, the test time for test equipment was set to a timer and cut off at a desired time, regardless of the irradiance that test sample 1 received, making it impossible to conduct accurate tests. .

For example, it takes 72.5 seconds for blue scale grade 4 to fade using the Sunshine Carbon Arc Lamp Accelerated 1 Weathering Tester.
K J / m' radiation! I need a surprise.

Conventionally, as a device for measuring, displaying, and adjusting the irradiance, temperature and humidity of a accelerated weather tester, (a) the irradiance and the temperature and humidity inside the chamber are determined at a fixed point in the test chamber; The black panel temperature of the sample surface (represents the temperature of the sample surface; the temperature of a stainless steel plate coated with black enamel; the temperature is -hi'yL depending on the test chamber temperature and light irradiation) is measured using a gold 11 thermometer. Attach the attached blackboard next to the sample and measure its temperature by looking at it.

In this device, the sample position is different in the former because the sample is rotating, and the black panel temperature is also different from 1 in the 11th view.
1111, so it is inaccurate.

(b) Rotation axis 1 of the sample rotation frame that rotates around the light source
- A sliding contact (slip ring) is attached to the sample rotation frame, and the signal from the photoreceptor, temperature/humidity sensor, etc. is output to the outside by attaching it to the sample rotating frame in line with the sample.

: In this device as well, the conventional slip ring has a large amount of wear due to the sliding contact between the m-moving contact and the rotary contact, and a large change in contact resistance, which makes the ΔIII constant value unstable and has a short life (see Section 8 below). (See Figure 9.)

Next, FIG. 5 shows a side sectional view of a translational 1-climate test machine equipped with the device described in (a) above, and FIG. As shown in the figure.

First, in FIG. 5, reference numeral 1 denotes a test tank, which is equipped with a light source 2 at the center of the tank, and around which a sample rotating frame 3 rotates.

A test tube 17 is attached to the sample rotation frame 3 facing the light source 2, and the test tube 17 receives radiation from the light source 2 and deteriorates as the test time passes.

In addition, a light receiver 9 for measuring irradiance (light energy) is fixed in the test tank l, and a temperature measuring element 8d for measuring the psychrometric temperature in the test tank is fixed in the test tank. A black panel temperature, ii 8 c, is attached to the one-rotation frame 3, calculated as the sample 7, and its temperature is determined 411 by viewing the image 11. Note that 4 is a rotating shaft, 5 is a bearing, and 6 is a motor.

Next, in FIG. 6, the sample rotating frame 3 has a rotating shaft 4 fixed to its center F, and the load of the sample rotating frame 3 is completely received by the bearing 5, and the motor 6a, sprocket, and chain 6
It is connected by b etc. and rotates.

Also, sensing parts such as a black panel temperature sensing part 8a and a light receiver 9 are attached to the rotating frame 3, and these also have a light source 2.
receives radiation from

A thermometer 8b is closely attached to the black panel thermosensor 8a, and a signal 5'i is output depending on the temperature of the air and the radiation from the light source 2. Upon receiving radiation from the light source 2, a photocurrent flows according to the irradiance.

By the way, this is the side heating body 8b of the black panel temperature sensing part 8a.
When a platinum resistor is used, a current of 5 mA is applied,
A resistance value corresponding to the temperature is sent to a temperature display/adjuster 12 through a bridge circuit, and ΔIII is determined, and when the photodetector 9 receives the radiation, a photocurrent of about 3 μA flows.

However, in order to take these signals H and + out of the test chamber through the -I- wire 35, since these signals are rotating, it is necessary to use a sliding contact device that converts the rotation of the lead wire 35 into a fixed state.

In FIG. 6, the black panel temperature sensing part 8a of the sample rotation frame 3F and the Riet wire 35 from the light receiver 9 slide through the hollow support 10 and further through the hollow rotation shaft 4. They are connected to the contact device 11, and then taken out to the outside to display the black panel temperature display/adjuster 12 and the irradiance, respectively.
1HIII (adjustment) section 13. In the figure, 1 is a test tank, 7 is a sample, and 15 is a joint.

The conventionally used sliding contact device shown in FIG.
It consists of a sliding contact 19 in a circular shape with a -1 edge and a fixed contact black 20 such as a silver black fixed in contact with the outer peripheral surface of the sliding contact 19, or a silver black attached to a rotating shaft. It consists of a sliding contact such as black and a ring-shaped fixed contact whose outer circumferential surface is in contact with the sliding contact, but it is a contact for a water device that takes out signals from a rotating detector etc. to the outside through a lead wire. The parts are always in sliding motion.

The conventional sliding contact device described in +iiij is a fixed contact device.
It is composed of a one-point black 20 and a sliding contact 19 that slides on it, but since the contact portion between the two slides, the contact 20.19 in the first part is easily worn out, and the insulation deteriorates due to the abrasion powder etc. In addition, the contact resistance increases, etc.) The life of the contact is short, which leads to erroneous beliefs, and there is a problem that accurate measurement over a long period of time cannot be made.

Figure 8 shows the relationship between the minute photocurrent generated when light straddles the photoreceiver 9, and the Ichikawa value obtained by passing this through a conventional sliding contact device and passing it through an amplifier. It is shown that the linearity breaks down when
i becomes impossible.

FIG. 9 shows the change in contact resistance of a conventional sliding contact device over time of use. As is clear from this, the contact resistance deteriorates rapidly after several months, and the contact resistance becomes unusable.

Next, the Acceleration 1 Soaking Test Machine, which has a rotating contact device consisting of a bearing, uses a rotating contact mechanism without a sliding part like a sliding contact device, so there is no wear of the contact part over time. On the other hand, since ball bearings are point contacts, the contact area is small, and even the slightest contact failure increases contact resistance, resulting in a lack of stability.

The present invention was made in order to solve the problems of the prior art as described above, and its purpose is to obtain a promotion 1 chuyo tester having a rotating contact device that has a long life and can provide a total of 1 u 11 stable for a long time. That is.

Means for Solving the Problems The uninvented method adopts the following steps to solve the problems in Section F.

A black panel temperature sensing section is mounted on the sample rotation frame that rotates around the light source installed in the test chamber.

A sensing part such as a light receiving part and a temperature measuring element is installed, and the sample rotation frame is rotated.
1.1.
In the acceleration 1 weathering test machine which has a contact device for transmitting data to the ΔIII section, etc., a tapered roller bearing 26 is provided as a relay contact of the contact device 41, and this circle ttL roller bearing 26 is formed as a rotating contact.

+iii The tapered roller bearing 26 contains carbon powder, silver powder,
Conductive grease 4o, which is made by blending conductive powder such as gold powder or copper powder into base oil, is injected.

Function The present invention, as described above, uses the tapered roller bearing 26 injected with conductive grease as a signal relay contact of the rotating slide Vj 35, and takes out the signal -J- to the fixed lead wire 39. The contact resistance of the relay contact is extremely low and it can be used for extremely smooth rotation over a wide range from high speed to low speed rotation, and the current applied can be used over a wide range from a minute current of 0.5 gA to about IA. be.

Embodiment An embodiment of the rotating contact device according to the present invention will be explained with reference to FIG.

Reference numeral 14 denotes a rotating shaft, which is connected to the rotating shaft 25a of the rotating contact device 41 through a joint r and 15. The rotating shaft 25a is coated with an insulating material or made of an insulating material.

In the tapered roller bearing 26, a fixed bearing 26a and a movable bearing 26b are combined as a pair via a spring 44. In the embodiment, two pairs of bearings 2
6 is provided.

This pair of bearings 26 is provided with two bearings 26a fixed at the center of the one-rotation shaft 25a, and moved under the I-ITf.
The bearings 26b are each provided with a flexible bearing 26b.

A movable tapered roller bearing 2 used as a contact point here.
6b, the inner ring 27 is screwed together with a metal inner ring fixing metal fitting 28 and tightened together, and this is connected to a screw hole provided in the rotating shaft 25a through an elongated hole 28a cut into the inner ring fixing metal fitting 28. It is built in so that the guide pin 28b can be screwed into the slot and slid northward by the length of the long hole.

Further, the outer ring 29 is fitted and fixed to an outer ring holder 30, and the outer ring holder 3
0 is fitted inside the insulator housing 42.

The housing 42 of the outer ring 29 and the outer ring holder 30 can be adjusted by turning the adjustment knob 38 and the lower adjustment knob 43.
Slide down 1-1 inside. In response to this, the aforementioned inner ring 27 moves along the rotating shaft 25a.

The other fixed tapered roller bearing 26a combined with this tapered roller bearing 26b is the same as the tapered roller bearing 26 described above.
In order to adjust the contact force between the inner rings 27, 36, and the outer ring 29 (that is, to adjust the contact resistance), the inner rings 27, 36, and the outer rings 29 are erected opposite each other via springs 44.

The opposing tapered roller bearings 26a are integrated by screwing the inner ring 27 into the inner ring fixing fitting 28, and are fixed to the rotating shaft 25a.

Further, the outer ring 29 is also fixed to the outer ring holder 30. The outer ring holder 30 is fixed to an insulator ring 32 and a housing 42 .

That is, a tapered roller bearing 26a that rotates integrally with a fixed fixed shaft 25a and a tapered roller bearing 26b that is assembled to slide downwardly along the rotating shaft 25a are set as one set.
A spring 44 is placed between them, and the adjustment screws 38 and 43 are used to raise and lower the -L: slideable tapered roller bearing 26b, and the length of the spring 44 is varied.
This is a rotating contact device that makes it possible to adjust the contact force (that is, contact resistance) between the inner ring 27 and the outer ring 29.

The tapered roller bearing 26 is coated with a conductive grease 40 containing silver powder and carbon. For example, when using the method proposed in Japanese Patent Publication No. 57-3S 975:, the contact resistance between the inner and outer rings becomes extremely small.

In the rotating contact device 41 configured in this way, the lead wire 35 from the detector etc. passes through the one rotation shaft 14, is pulled out from the hole 25b drilled in the insulating rotation shaft 25a, and is connected to the inner ring fixing metal A28. Connected.

In this way, the signal from the detector etc. reaches from the lead vj35 to the inner ring 27, and then to the roller 36. It reaches the outer ring holder 30 via the outer ring 29.

The signal to be taken out to the outside is taken out from the terminal 37 of the outer ring holder 30 through the relead wire 39, and is sent to the measuring section 12.1 installed outside.
3 etc.

That is, a signal from a rotating detector or the like is transmitted through the tapered roller bearing 26 through the rotating shaft 25a by the Riet wire 35.
Measurement 8'l securely installed outside! 12.13 etc.

By installing this rotating contact device FI41 in place of the conventional sliding contact device (slip ring) 11 of the weather resistance tester shown in Fig. 6, it is possible to accurately measure and adjust the irradiance of the sample surface, black panel temperature, etc. It is.

Next, an experimental example of the apparatus of the present invention will be explained based on FIGS. 2 and 3.

Figure 2 shows the minute photocurrent generated by light falling on the receiver,
It shows the relationship between this and each voltage obtained through the rotating contact device 41 and the amplifier, and the correlation is a straight line.
As is clear from this, even when a weak current is passed through the rotating contact device 41, the contact resistance is constant and there is no effect on signal output.

Figure 3 shows how the contact resistance changes when this device is used for a long period of time.At the beginning of use, the resistance slightly decreases, but after that it hardly changes and remains stable. It was extremely effective.

Effects of the Invention The effects of the present invention, as shown in Figures 2 and 3 above, enable stable and accurate iE measurement over a long period of time, and fulfill the role of a parallel weathering tester. be.

In addition, the measurement error that occurs when the fixed A1 is constant as in the conventional one can be eliminated, and since the present invention does not have a sliding part and uses a rotating contact mechanism as in the conventional stepped contact device,
There is no wear on the contact parts over time, and therefore there is no drop in insulation resistance over time, and because it uses a tapered roller bearing injected with conductive grease and applies pressure in the thrust direction. The contact resistance between the inner and outer rings is extremely small, so even when a weak current is applied, there is no effect at all.
E Accurate measurement can be performed, and if the contact resistance between the outer ring and the inner ring is low, the contact force between the two wheels can be adjusted as desired, so it can be used stably for a long time.

Furthermore, the present invention uses a tapered roller bearing as a contact rotation mechanism, and in this tapered roller bearing, the rollers are in line contact with the inner ring and the outer ring, whereas the conventional 15 bearing is in point contact with the L, inner ring, and outer ring. However, since the contact area is large compared to that of the other materials, it has excellent electrical conductivity.

At the same time, since it is a conical roller, it has excellent stability against loads in the thrust direction, and can function as a contact device.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a rotating contact device according to the present invention, and FIG. 2 is an explanation showing the relationship between photocurrent and amplifier output pressure when a photocurrent is passed through the rotating contact device according to the invention. Fig. 3 is an explanatory diagram showing how the contact resistance changes with time of use of the rotating contact device according to the present invention, Fig. 4 is a sectional view of the conventional rotating contact device, and Fig. 5 is a fixed sensing section. Figure 6 is a cross-sectional view of the weathering tester equipped with the sliding contact device "A@L,"
7 is a cross-sectional view of a conventional sliding contact device, and FIG. 8 is a cross-sectional view of a conventional sliding contact device.
Fig. 9 is an explanatory diagram showing the relationship between current and amplifier output voltage, Fig. 9 is an explanatory diagram showing how the contact resistance changes with usage time of a conventional sliding contact device, and Fig. 1O is an enlarged cross section of the tapered roller bearing of the present invention. It is a diagram. l...Test tank, 2...Light source, 3...
...Sample rotation frame, 4...Rotation axis, 8...
...Black panel temperature sensing part, 9... Light receiving part, 1
1... Sliding contact device, 12... Black panel temperature display controller, 13... Irradiance measurement (adjustment) section, 25a... Insulation Product rotating shaft, 2
6... Tapered roller bearing, 27... Inner ring,
28...Inner ring fixing metal fitting, 29...Outer ring, 30...Outer ring holder, 32...Insulator ring, 35...Lead wire , 36...roll, 38.43...adjustment knob! i ship

Claims (5)

[Claims] (1) A black panel temperature sensing part, a light receiving part, a black panel temperature sensing part, a light receiving part,
A sensing section such as a temperature measuring element is provided, the sample rotating frame is connected to a contact device via a rotating shaft, and a signal from the sensing section is taken out from the contact device via a lead wire and transmitted to a measuring section, etc. In an accelerated weathering tester having a contact device (4
1) An accelerated weathering tester having a rotating contact device, characterized in that a tapered roller bearing (26) is provided as a relay contact, and the tapered roller bearing (26) is formed as a rotating contact. (2) A patent characterized in that a tapered roller bearing (26) is injected with conductive grease (40) made by blending conductive powder such as carbon powder, silver powder, gold powder, copper powder, etc. into base oil. An accelerated weathering tester comprising the rotating contact device according to claim 1. (3) Connect the tapered roller bearing (26) to the inner ring (27) and outer ring (2
9) with a plurality of rollers (36) disposed between them, the inner ring (27) is rotatable, the outer ring (29) is fixed, and the rollers (36) are rotatable. An accelerated weathering tester comprising a rotating contact device according to claim 1 or 2. (4) A spring (44) is provided between the pair of upper and lower tapered roller bearings (26), the outer ring (29) of one tapered roller bearing (26a) is fixed with the outer ring bearing (30), and the outer ring (29) of one tapered roller bearing (26a) is fixed with the outer ring bearing (30). (26b), connect the outer ring holder (30) to the insulator housing (
42) The inside can be slid and the inner ring (27)
An accelerated weathering tester having a rotating contact device according to claim 1, 2 or 3, wherein the rotating contact device is slidable along an insulating rotating shaft (25a). (5) The inner ring (27) is rotatable together with the rotating shaft (25a), and upper and lower adjustment knobs (38) and (43) are provided to adjust the load of the spring (44), and each inner ring (27) ), the rollers (36), and the outer ring (29), the pressing force, that is, the contact resistance, can be equally adjusted. An accelerated weathering tester having the rotating contact device as described.