JPS60161543A - Heat resistance testing apparatus for plastic - Google Patents

Abstract

PURPOSE:To automatically perform the test such as the load distortion temp. test of hard plastic, by providing a means for transferring a test piece in a grasped state to a means for displacing the test piece so as to raise the said test piece above the liquid surface of a heat transfer medium and to fall the same under the liquid surface thereof. CONSTITUTION:An oil tank 12 is provided to the side part of a main body 11 and a test piece raising and falling means 13 to the upper part of said tank 12. Each of the test pieces 10 stacked in a test piece holder 15 is extruded to a mount table 20 by a cylinder 17 and a transfer part 25 in a stop state is dispalcement by 90 deg. toward the mount table 20 and, thereafter, the displaced transfer part 25 is fallen by a cylinder 22 and again raised after grasped the test piece 10 present on the mount table 20. After the test piece 10 was grasped, the transfer part 25 is displaced by 90 deg. toward the oil tank 12 and, after the grasping part of said transfer part 25 is extended, the transfer part 25 is fallen to mount the test piece 10 on the support table of a stand and, herein, the test piece 10 is immersed in the oil tank 12. Thereafter, a series of a load distortion temp. test or the Vicat softening point test of a thermoplastic resin piece is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for heat resistance testing of plastics, such as load deflection temperature testing of rigid plastics and Vicat softening point testing of thermoplastics.

Figure 1 is a sectional view of a conventional test device, and Figure 2 is a cross-sectional view of a conventional test device.
It is a sectional view taken along the section line ■-■ in the figure. This testing device is used for load deflection temperature testing of hard plastics.

In this testing device, the load deflection temperature test of hard plastics is carried out in the following steps. A test piece 5 is placed on a support stand 6 in a heating bath 1 containing a heat transfer medium such as silicone oil.

A weight 2 is placed on a weight plate 7 provided at the upper end of a load rod 3 extending in the vertical direction. An indenter 4 provided at the lower end of the load rod 3 is pressed against the test piece 5, and a predetermined bending stress is applied to the test piece 5 by the weight 2 at one foot speed.
The temperature of the heat transfer medium is increased and the temperature of the heat transfer medium is measured when the test piece 5 reaches a predetermined amount of deflection, and this temperature is taken as the deflection temperature under load of the plastic.

FIG. 3 is a sectional view of another 'prior art test device, taken along section line 1--IV in FIG. 4, 1j, 143. This test device is used for the Vicat softening point test of thermoplastic plastics. This test device is similar to the test device described above, with the same reference numbers in corresponding places. shown below. In this test device, the test operation is carried out in the same manner as in the prior art described above.

To the test piece 5a in the heating bath 1 containing the heat transfer medium.

While applying a predetermined load to the test piece 5a with a needle-shaped indenter 4a in vertical contact, the temperature of the heat transfer medium is raised at a constant speed,
The temperature of the heat transfer medium was measured when the needle indenter 4a reached a predetermined amount of depression in the test piece 5a.

This temperature is the softening point of all plastics.

In these test devices described above, a series of test operations are performed manually, and automated devices have not yet been developed.

An object of the present invention is to provide an automated testing device for use in load deflection temperature testing of hard plastics and Vicat softening point testing of thermoplastics.

Fig. 5 is a front view of the embodiment of the present invention, Fig. 6 is a side view, and Fig. 7 is a sectional view taken along the cutting plane line ■-■ in Fig. 5. Basically, this test device The test piece consists of a main body 1, an oil tank 12 provided on the side of the main body 11, and a test piece lifting means 3 provided on the upper part of the oil tank 12.

An operation panel 14 is provided on one side of the main body 11. The operation panel 14 has a main switch SW1. Operation keys such as an automatic operation selection switch SW2 and a manual operation selection switch SW3 are provided. A test piece holder 15 is vertically mounted on the upper plate 11a of the main body 11. Test piece holder 15
Inside, the specimen 10 to be tested is laminated. At the bottom of the test piece holder 15, cutouts 16a, 1 are provided in a straight line.
It has 6bk. A test piece delivery cylinder 17 is provided below the test piece holder 15 and on the back surface of the upper plate 11a of the main body 11. A piston rod 18 is connected to the cylinder 7.1. A ViL-shaped connecting rod 1 is attached to the tip of the piston rod 18.
9 is the upper panel] i It is inserted through the elongated hole 11b drilled in a. By driving the piston 17'ft, the connecting rod 19 moves along the elongated hole 11'b, and the tip of the connecting rod 19 is inserted from the notch 16b, and the test piece is stacked on the test specimen holder 15. Piece 10 fully extruded, notch 1
The test piece 1o is sent to the mounting table 2o via 6a. A support 23 is fixed in the vertical direction inside the main body 11.

The support column 23 is provided with a cylinder 22 for raising and lowering the transfer section, and the cylinder 22 has a piston rod 24 connected to the upper plate 11a. It is inserted and installed. A transfer section 25 is provided at the tip of the piston rod 24 as a means for transferring the test piece IO. Transfer section 2
5ij, it can be moved up and down by the cylinder 22. 1 on the main body 11 & 11a in the vicinity of the transfer section 25
A cylinder 26 for changing the direction of the transfer section is provided on the back surface of the transfer section. Piston rod 26a of cylinder 26 and transfer section 2
5 are connected by a connecting rod 27, and by reciprocating the cylinder 26 as shown by reference numeral A, the transfer portion 25 can be angularly displaced by 90 degrees as shown by reference numeral B with the piston rod 24 as an axis. be.

A heater 3o is provided below the oil tank 12.

A motor 31 is fixed to the upper plate 12a. The configuration is such that a stirring blade 32 is rotated within the oil phase 2 by a motor 31. Furthermore, a cooling vibe 33 is provided in the oil tank 12 . The cooling vibrator 33 is configured such that a cooling liquid flows through the cooling vibrator 33 when the heat transfer medium in the oil tank 12 is completely cooled.

FIG. 8 is a sectional view of the vicinity of the test piece lifting means 13, and FIG. 9 is a fil 1 side view thereof. It consists of a cylinder 42 with 13 test piece lifting means and a pedestal 46 which can be moved up and down by a piston rod 43 of the cylinder 42.

A support plate 41 is fixed to the tops of four columns 4° erected from the four corners of the oil tank 12 so as to be in a horizontal plane, and a cylinder 42 for raising and lowering the pedestal is mounted on the support plate 41 so that its axis is aligned with the support surface 41. It is fixed so that it is perpendicular to. The piston rod 43 of the cylinder 42 passes through the support plate 41 and a support plate 44 is fixed thereto. The support plate 44 and the pedestal 46 are fixed by a plurality of connecting rods 45. The upper plate 46aH of the pedestal 46 is formed to be thicker than the width direction of the pedestal 46. The upper plate 46a and the support plate 44 are supported movably up and down by a pair of support rods 48a and 48b extending in the vertical direction. The support rods 48a and 48b are fixed to the fixing plate 41 and the upper part 8!12a of the oil tank 12. Top plate 1
2a has a hole 12bk through which the frame 46 passes. The pedestal 46 has a space 64 in which the test piece 10 to be tested can be placed horizontally, and the test piece 10? A pair of rising parts 65 that can be clamped
has. A pair of support stands 66 for supporting the entire test piece 10 are fixed between the pair of rising parts 65.

The support stand 66 extends in the width direction of the test piece IO and is formed in a cylindrical shape with a radius of 3 mm. Test piece 10? The supporting distance 11 is added to lOcm. A load rod 49 extending vertically from the upper plate 46a of the frame 46 to the space 64 is inserted. A weight plate 49a on which a weight 52 is placed is provided at the upper end of the load a49.

Test piece 10 at the bottom end? An indenter 70 for pressure contact is provided. The tip of the indenter 70 in contact with the test piece 10 has a radius of 3 m.
m is formed on the curved surface, and the tangents touching the test piece 10 are spaced at a distance of /! It is placed in the center of 1. When testing, when the cylinder 42 is driven and the pedestal 46 is fully lowered, the liquid level of the heat transfer medium such as silicone oil stored in the oil tank 12 should be at least 35 mm above the upper surface of the test piece 10. will be established.

A differential transformer 51 is provided above the weight 52, and a differential transformer 511-j upper plate 46. Post 5 fixed to a
Fixed by 0.

The upper plate 46a is provided with load and load removal means.

A swinging part 60 is swingably supported on a support shaft 6 fixed perpendicularly to the upper plate 46a, and is provided so as to come into contact with the back surface of the sleeping tray 49a when lifting the load. The swinging member 60 is in contact with the upper surface of the roughly rectangular movable body 59, and is fixed to the connecting rod 58 of the movable body 59H. The connecting rod 58 is swingably supported by the connecting rod 55 via the connecting rod 57. The connecting rod 55 is pivotally supported by a pair of rising portions 47a and 47b provided protruding from the upper plate 46a. 55 connecting rods.

It is connected to a piston rod 54 of a cylinder 53 which is fixed across a pair of columns 40 and supported by a female support plate 62. The connecting rod 55 and the piston rod 54 are configured to come off when the pedestal 46 is lowered.

Between the pair of rising parts 47a and 47b.

A locking portion 63 is fixed to the connecting rod 55, and the locking portion 63 is in contact with the ten thousand rising portions 47b. A spring is wound around the connecting rod 55 between the locking portion 63 and the other rising portion 47a. In this way, the connecting rod is spring-biased in the C direction. When connecting rod 55 and piston rod 54 are connected, spring 561 facilitates positioning of connecting rod 55.

By double-acting the cylinder 53 in the load and load removal means having such a configuration.

Loads can be added or removed.

FIG. 10 is an enlarged plan view of the transfer means 25, and the first
1 is a sectional view taken along the section line NM in FIG. 10. A transfer means 251-j is formed perpendicularly to the piston rod 24, and includes a gripping part 69 for gripping the specimen to be tested, a gripping part 69'i for gripping the piston 71, and a piston 71 that can be moved in the horizontal direction. Consists of. As described above, the axial direction of the transfer means 25 is set by the piston 26 (see FIG. 7) in a horizontal plane, with the piston rod 24 as an axis, in the direction of the mounting table 20 (the X direction in FIG. 7) and the direction of the oil tank 12. Direction (7th
It can be angularly displaced in the Y direction (in the figure).

A support plate 73 is vertically fixed to the piston rod 72 of the cylinder 71. A grip portion 69 is fixed to the support plate 73 via a connecting rod 74 parallel to the piston 71 .

The holding part 69 consists of a base plate 75 fixed to a connecting rod 74, and a cylinder 76 fixed to the base plate 75. Board 75
A pair of guide rods 77a are located on the horizontal plane, and near both ends thereof, parallel to the connection e74.

77b is provided so as to penetrate through the substrate 75. Guide rod 77a
, 77b, a guide plate 78 and a pair of gripping pieces 79a, 79b connected to the guide plate 78 are fixed. The guide plate 78 has two pairs of brackets 80 and 81 facing upward.
will be appointed. Guide pieces 82.83 are respectively held by the two pairs of brackets 80.81 and fixed with pins 84.85.

Guide pieces g8.89 are fixed to each of the guide pieces 82,83 via horizontally extending guide rods 86,87''f.

FIG. 12 is an exploded perspective view of the vicinity of the tip of the piston rod 91 of the cylinder 76. A support plate 92 is vertically fixed to the tip of the piston rod 91. This support plate 92 has a roughly U-shaped shape, and has a base 92a and an extension i95a,
95b, 96a, and 96b. The extending portions 95a and 95b are parallel to the piston rod 91 and have a gap into which the connecting rod 97 is inserted. An insertion hole 107a is provided in the extension portion 95a, and an insertion hole 107a is provided in the extension portion 95b.
An insertion hole 107b is provided at a position corresponding to 7a. The extending portions 96a, 96b have the same configuration as the extending portions 95a, 95b, and are respectively provided with insertion holes ]08a, ]08b. A continuous stroke 98 is inserted between the extending portions 96a and 96b. On the base 92a of the support plate 92, gripping pieces 93 and 94 are provided to protrude from the side opposite to the surface facing the piston rod 91. Taken away 9
7.98 is roughly HY-shaped, and each base 9
7a, 98a and a pair of locking portions 97b, 98b.

A long hole 0] and a shaft hole 103 are formed in the base 97a of the guide 97. A pair of long holes 105a and 105b are formed in the pair of locking portions 97b of the connecting rod 97.

Long hole 101. Shaft hole 103 and pair of long holes 105a, 1
05bld - Axial holes on straight lines and in the middle of them]
03, a long hole 10] and a pair of long holes 105a, 105
It is formed at a position symmetrical to b.

The connecting rod 98 also has a similar configuration. That is, a long hole 102 and a shaft hole 104 are formed in the base 98a of the connecting rod 98, and long holes 106a and 1 (16b) are formed in the pair of locking portions 98b.
is formed. Long hole 102. Shaft hole 104 and pair of long holes 106a, 106btf - Regarding shaft hole 104 located on a straight line and in the center of them, the long hole 102 and pair of long holes 1
06a and 106b are formed at symmetrical positions. Ren 19
The locking pin 99a is loosely inserted into the elongated hole 1 of the brackets 95a and 95b.
By inserting and locking into 07a and ]07b,
A connecting rod 97 is connected between the brackets 95a and 95b.

The same goes for Renjo 98.

The locking pin 00a is loosely inserted into the elongated hole 102, and the bracket is
Connecting rods 97 and 9 in which connecting rod 98 is connected between 96a and 96b
8 is a hole 75a bored in the substrate 75;

75b (see FIGS. 10 and 11), and are swingably supported by the substrate 75 by shafts inserted into shaft holes 103 and 104, respectively. The aforementioned guide pieces 88 and 89 are inserted into the locking portions 97b and 98b, respectively. ill holes formed in guide pieces 88 and 89】09. ] The locking pins 99b and 100b are inserted into the locking pins 99b and 100b and fixed.
Both ends of b and 100b are elongated holes 105a and 105, respectively.
b Oh! The connecting rods 97.9B and the guide pieces 88.89 are loosely inserted into the elongated holes 106a and 106b in this manner.

By driving the cylinder 76' in the gripping section 69 having the above-described configuration, the test specimen 10'y can be gripped by the gripping pieces 79a, 79b, 93.94. In addition, in the connecting rods 97 and 98, the shaft holes 103 and 10
In a symmetrical position with respect to 4.

Long holes 101, 102 and a pair of long holes 105a, 105b;
106a, ]06b are formed.

The gripping pieces 79a, 79b and the gripping pieces 93, 94 can be combined to grip the test piece 10 at a speed b.

In the following description, the state in which one gripping portion is closest to the cylinder 71 and the axis of the cylinder 71 is in the Y direction will be defined as the rest state of the transfer means 25.

FIG. 13 is a block diagram showing the components of the test apparatus of the present invention. The test piece 10 stacked on the test piece holder 15 is pushed out onto the mounting table 20 by the cylinder 17 . Among them, the transfer means 25' which is in a rest state is angularly displaced in the direction of the mounting table 20 (X direction in FIG. 7) by the cylinder 26. After the angular displacement, the transfer means 25 is lowered by the cylinder 22, and the first gripping part 69 grips the test specimen 10 on the mounting table 20, and then rises. After gripping the test piece 63i, the transfer means 25 is angularly displaced in the direction of the oil tank 12 (Y direction in FIG. 7), and the grip portion 69 is extended toward the pedestal 46 by the cylinder 71. Furthermore, the transfer means 25 is lowered by the cylinder 22, and the test piece 10 is placed on the support stand 66 of the pedestal 46.

After that, the transfer means 25 rises and the gripping part 69
degenerates and returns to hibernation state. The pedestal 46 on which the test piece 10 is placed is immersed in the oil bath 12 by the cylinder 42 .

The series of operations described above is controlled by the control circuit 201. After a series of operations are controlled by the control circuit 201, a signal is sent to the central processing circuit 202, and the signal sent to the central processing circuit 2()2 is sent to the temperature increase control circuit 206.

At that time, it is determined whether it is a load deflection temperature test for hard plastics or a Vicant softening point test for thermoplastic plastics, and 1 and 7 IC signals are sent to the heater 30.

The total temperature of the heat transfer medium is raised at one speed according to each test. After the temperature is completely measured by the temperature measuring element 67 installed near the pedestal 46, the signal is returned to the control circuit 206.
It is recorded by the central processing circuit 202 via an analog/digital converter 203.

70 indenters are pressed against the test piece 10 and one weight is 52? Plate 49
a, and a constant load is applied to the test piece 10 according to the test. Differential transformer 5 for displacement detection when applying load
1, a signal is not sent through the amplifier circuit 205, and zero adjustment is performed in the zero adjustment E port j path 204. Measure the temperature of the heat transfer medium when it reaches a certain amount of deflection or dent due to the load, and then measure the temperature. The plastic's deflection temperature under load "! is the softening point of the bamboo shaft. After the deflection temperature under load is set, a signal is sent from the central processing circuit 202 to the temperature increase control circuit 206, and the heater is energized at 3 degrees. After the test is completed, the central processing circuit 202
A signal is sent to the control circuit 201, and a test piece removal operation is performed. That is, the pedestal 46 is raised, the transfer means 25 is moved to the position of the pedestal, the test piece 10 is gripped by the second gripping part 69, and then the specimen 10 is displaced by 90 degrees. Abandoned in a ditch). Furthermore, cooling water flows through the cooling pipe 33 to cool the heat transfer medium in the oil i%LI2.

The load deflection temperature test of hard plastics is carried out using the above test equipment according to the following procedure.

First, as shown in FIG. 14, the main switch SWI' (i- is turned on in step t), and in step t2, either automatic rilJ operation or manual operation is selected.

If the operation is automatic, the process moves to step t3, and if the operation is manual, the process moves to step t4.

FIG. 15 is a flowchart when performing the own wJ operation. First, the process moves from step SO to step s1, and in step s1 it is determined whether the start switch is turned on. If it is turned on, the process moves to step s2. In step s2, the test piece 10 is placed in the test piece holder 15.
It is fully determined whether or not they are stacked, and if they are stacked, the process moves to step s3. In step s3, a series of test piece mounting operations are performed. In step s4, the temperature of the heat transfer medium in the oil tank 12 is increased and a test is performed. The temperature increase rate in this case was 2°C/min.

The predetermined amount of deflection is 0.254 mm. After the test is conducted, the process moves to step s5, and a sample removal operation is performed. Thereafter, the oil tank 12 is cooled in step S6, and in step s7 it is determined whether or not the oil tank 12 has finished cooling. If the oil tank 12 has not been cooled, the process returns to step s6.

Cooling is performed again. When the oil 1a12 has finished cooling, the process returns to step s1. When the start switch is not turned on in step s1 and when the test pieces 1o are not stacked in step s2, the operation does not proceed.

FIG. 16 is a flow chart for explaining the series of test piece mounting operations in step s3 in FIG. 15.

First, move from step DO to step n1, and then step n
1, the pedestal 46 is raised by the cylinder 42. In step n2, the load is removed from the test piece 1o by the load removal means. In step n3, the grip portion 69 is angularly displaced toward the mounting table 20. At this time, the test piece 1o is pushed out onto the mounting table 2o of the test piece holder.

In step n4, the grip portion 69 is lowered.

In step n5, the test piece 10? grasp. After that, in step n6, the grip part 69 is fully raised,
Move to step n7 and move the 1 grip 69 towards the frame 46.
An angular displacement of 0 degrees. In step n8, one gripping part is extended in the space 641 of the pedestal 46, and the process moves to step nlO, in which one gripping part 69 is lowered. The test piece 10 is placed on the support stand 66 apart from the test piece 10' of the gripping part 69. Furthermore, the grip part 6
9 is raised to return one gripping part 69 to the resting state. In step n]4, the load is centered. In step n15, the pedestal 46' (lowered by the r-piston 42).

In step n16, the temperature of the oil tank is raised and the test starts.

FIG. 17 shows the test piece removal operation in step s5 of FIG. 15? It is a flow chart for explanation. Test piece 10? ! - After the test, the process moves from step rrrO to step ml, and in step ml the pedestal 46 is raised by the cylinder 42.

Moving from step ml to ~2, the load is removed by the load and load removal means, and then the process moves to step m3, where 5 gripping parts 69 are separated by the space 64 of the entire frame, and in step m4, the load is gripped by the cylinder 22. Part 69'! r - Descend to test piece 10. In step m5, the test piece 1 (1) is held by the gripper 69 after being tested.
After gripping 1, in step m6, the gripping portion 69? raise. Further, in step m7, the gripping portion 69 is moved back.

In step m8, the gripping portion 69 is angularly displaced by 90 degrees toward the test piece holder. Furthermore, the piston rod 72 is extended, and the 10 tested specimens are released from the grip part 69, and the test specimens]0
The liquid is discarded into a tray 68. After that, in step mll, the gripping part 69 is retracted and one gripping part 69 returns to the rest state. In step m12, the load is lowered, and in step m1
3, when the mount 46 is immersed in the oil tank 12, the mount 46
is cooled together with the heat transfer medium. In this way, a series of test piece removal operations are performed.

In addition, in one or more test operations, the thickness of the test piece 1o,
Length 12.5-14.0 cm, width and height Vil, 25
~1.29cm can be added. Furthermore, the load P can be calculated using formula 11.

1 In the il1 formula, the bending stress applied to the Ske test piece, b is the width of the test piece (cm), and dI/i is the height of the test piece (cm).
l! 1 is the distance between fulcrums (xOcm). In this test, a load p (Kg) is added so that one bending stress S becomes 18.5Kg/cm2.

FIG. 18 is a flowchart for explaining manual operation. In the manual operation, when testing all 10 test pieces, the entire test is automatically performed for each series of steps. First, the process moves from step rO to rl, and in step r1, it is determined whether the set switch is turned on. If the set switch is turned on, the process moves to step r2, and the test piece mounting operation is performed. Testing is performed after the specimen is mounted and operated. In step r3, it is determined whether the set switch is on, and if the set switch is on, the test piece removal operation is performed in step r4. Step r1. In step r3, the set switch is manually operated. Step r2. If the cent switch is not turned on at 'r4, the operation will not proceed.

FIG. 19 is a flowchart for raising and lowering the pedestal 46 in manual operation. First step vO to vl
Then, in step vl, it is determined whether the pedestal 46 is completely raised or lowered. When the switch for raising the pedestal 46 is turned on, the pedestal 46 is raised to attach the test piece, and when it is turned off, the pedestal 46 is lowered to attach the test piece.

FIG. 20 is a flowchart of the load and load removal means. First, move from step wO to wl.

In step w1, it is determined whether to apply a load or not,
If you want to apply a load, move to step w2.

Lowering the blunt 49ar by means of loading and unloading,
Apply a load to the test piece lO. If no load is to be applied, proceed to step w3 and use the blunt force 49a? It rises and removes the load.

FIG. 21 is a flowchart for explaining the entire operation of pushing out all the test pieces 10 from the test piece holder 15 onto the mounting table 20. First, move from step qO to ql, then step q1
At step q2, it is determined whether the switch for pushing out the test piece 10 onto the mounting table 20 is turned on or not.

Above configuration? Thermoplastic 70a in a test apparatus with 70a. The tip of the needle indenter 70a that contacts the test piece 10a is cylindrical with a diameter of 3 mm and a cross-sectional area of 1 mm2. The needle-like indenter 70a is pressed so that its axis is perpendicular to the surface of the test piece. Further, the test piece 1'Oa is mounted on a rectangular supporting structure 6a. The test piece 10a has a length of 0.9. cm, width], (1cm
, I applied a little more force to the high g + 1.6 cm.

The load xp is IKg 0 In this way, the temperature of the heat transfer medium in the oil tank 12 is raised at a rate of 750607 hours, and the total temperature is measured when the needle indenter 7-0·a penetrates the test piece 10a by 1 mm? Sh.

This temperature is defined as the Vicat softening point. In the operation after completion of the Picassoto softening point test for each test piece, the needle indenter 70a cannot be removed from the test piece 10a while the test piece 10a is still soft until it is cooled. As a result, the needle-like indenter 70''- can be easily removed from the test piece 10a.

There is no difference in other operations from the deflection temperature test described above.

As described above, according to the present invention, the entire mount supporting the test specimen can be moved up and down, and there is a means for moving the test specimen and the mount 1, and a means for moving the test specimen to the mount. Since the system is equipped with a system for completely cooling the oil tank, a series of test operations can be performed automatically or easily by automatic operation or manual operation.

[Brief explanation of drawings]

Figure 1 is a sectional view of the prior art deflection temperature testing device;
The figure is a sectional view taken from the section line 1-n in Fig. 1, Fig. 3 is a sectional view of the prior art Vicat softening point test device, and Fig. 4 V.
1. Cross section taken from section line IV-N in FIG. 3. Fig. 5 is a front view of an embodiment of the present invention, Fig. 6 is a side view of an embodiment of the great invention, Fig. 7 is a cross-sectional view taken from the section line ■-■ in Fig. Fig. 8 is a side view of the vicinity of the gantry elevating means ] 3, Fig. 9 is a front view of the vicinity of the gantry elevating means 13, Fig. 10 is a plan view of the transfer means 25, and a cutaway of Fig. 1 - j Fig. 10. 12 is an exploded perspective view of the vicinity of the tip of the piston rod 91, FIG. 13 is a block diagram for explaining the present invention in detail, and FIG. 14 is a main routine. , FIG. 15 is a flowchart for explaining all automatic operations, and FIG. 16 is step s 3 '? of FIG. 14. -Large flowchart to explain. Figure 17 Vi Step s5 in Figure 14? FIG. 18 is a flowchart for explaining manual operation, and FIG. 19 is a flowchart for explaining manual operation. r - flowchart to explain;
FIG. 20 is a flowchart for explaining the manual operation +c load and the operation of the load removing means;
The figure is a flowchart for explaining the operation of pushing out the test piece IO onto the mounting table 20, and FIG. 22 is a sectional view showing the state in which the needle-like indenter 70 is also in contact with the test piece 10a. 12... Oil tank, ]3... Test piece elevating means, 25 Medium transfer means, 33... Cooling pipe, 69... Gripping part,
70...Indenter, 7na-needle indenter, 2()1... Control circuit. 202... Central processing circuit, 2o3... Analog/digital converter, 204... Zero adjustment circuit, 2o5...
Displacement amplification circuit, 206...Temperature increase control circuit agent Patent attorney Kei Nishi Figure 1'' ■ Figure 2 Figure 3 ■ Figure 4 Figure 16 Figure 17 Figure 19 Figure 20 Figure 21 Figure 22

Claims (1)

[Claims] +11 A tank in which a liquid heat transfer medium is stored. and means for increasing the temperature of the heat transfer medium. means for cooling the heat transfer medium; means for vertically displacing all the test pieces to be tested above and below the liquid surface of the heat transfer medium; means for applying and removing a predetermined load to the test piece while the test piece is above the liquid level of the heat transfer medium; A plastic Jj% JEJ testing apparatus, characterized in that the lifting/lowering displacement means is provided with means for gripping and transporting the test piece. (21) The means for applying and removing the load is as follows: It has a needle-like indenter, and after the Vicat softening point test for each test piece is completed and while the test piece is still soft, the linear indenter is applied to the test piece. The plastic heat resistance test device described in item 1 shall be removed from the plastic heat resistance test device.