JP5456530B2 - Load testing machine - Google Patents

Description

  The present invention relates to a load cell load tester.

  The load cell load tester includes, for example, a plurality of weights stacked on a support plate. The plurality of weights each have an engaging portion in which adjacent weights engage with each other in the vertical direction, and in the stacked state, there are gaps in these engaging portions. And if a support plate is lowered | hung in the state which suspended the uppermost weight, these weights will be suspended in order from the top in the corresponding engaging part. In the initial state, the support plate supports a plurality of weights so as to be stacked, and the load cell is not subjected to a load. Then, by lowering the support plate, a load is applied to the load cell in order from the upper weight, thereby performing a step load test in which the weight of the weight included in the load tester is increased stepwise. (For example, refer to Patent Document 1).

JP-B 61-44254

  By the way, in the load test, in addition to the above-described step load test, for example, a load corresponding to the load cell capacity of the load cell such as a preliminary load test performed before the step load test and a creep test performed after the step load test is applied to the load cell. There is a test to load. In this case, it is necessary to perform a test in which loads of a plurality of weights included in the load tester are simultaneously applied to the load cell. However, the load tester described in Patent Document 1 cannot perform these tests. Moreover, although a high-accuracy load test is performed under a predetermined temperature and humidity, Patent Document 1 does not mention this at all.

  Therefore, it is conceivable to perform a load test by attaching a dedicated jig for performing a preload test and a creep test to the load tester, and positioning the jig and the load cell in a thermostat. . However, in that case, when shifting from the preliminary load test to the step load test or from the step load test to the creep test, it is necessary to attach and detach the above-mentioned dedicated jig. The problem will be that the environment will change and test accuracy will be reduced.

  In order to solve the above problems, a load testing machine according to the present invention includes a first support for supporting a DUT and a first support for the first support that moves up and down relative to the first support. In a state where the second support body capable of setting a reference position and a weight engaging portion where adjacent weights engage with each other in the vertical direction, the second support body is located at the first reference position. A plurality of weights stacked on the second support with a gap in the weight engaging portion in the vertical direction, and a test object positioned above the first support and supported by the first support And a load body / weight engaging portion engaging in a vertical direction with a weight located at the top of the plurality of weights, and the second support is the first reference. When the load body / weight engagement portion is in the vertical position, A load body supported by the second support body, and a suspension engaging portion that engages with the load body in the vertical direction, and moves up and down relatively with respect to the first support body. A suspension body capable of setting a second reference position relative to the first support and having a gap in the suspension engagement portion in the vertical direction at the second reference position.

  According to this configuration, the second test body and the suspended body are moved up and down relatively with respect to the first support body, so that an arbitrary number of weights can be suspended on the load body alone and on the load body. The weight applied to the DUT can be increased stepwise. Therefore, it is possible to perform multiple tests, such as a test in which a plurality of weights are loaded on the DUT at the same time, a test in which the load is increased by increasing the load on the DUT without requiring a dedicated jig. It is possible to prevent environmental changes that occur when the dedicated jig is attached or detached. Therefore, the accuracy of the test can be improved.

  In the load testing machine according to the invention, the suspension engaging portion of the suspension body and the load body are engaged, and the load body / weight engagement portion of the load body and the weight located at the top are provided. The second support body is lowered relative to the first support body so that the weight engaging portions of the plurality of weights are engaged with each other, and the load body and the A load of a plurality of weights is loaded, and then the suspension body is lowered relative to the first support body so that the pressing portion presses the DUT from above, and the load body and the plurality of weights are lowered. The weight of the test piece may be applied to the DUT.

  With such a configuration, it is possible to perform a test in which loads of a plurality of weights are simultaneously applied to the DUT.

In the load testing machine according to the invention described above, the suspension body and the second support body are provided while maintaining a vertical clearance between the load body / weight engaging portion so that the pressing portion presses the DUT from above. The load body is lowered relative to the first support body, and the load of the load body is applied to the DUT. Thereafter, the load body / weight engagement portion of the load body and the weight of the plurality of weights said second support member so that Ru engaged and weight located above is relatively lowered with respect to the first support member, and, then, downward in order from the weight located on ones of said plurality of weights The weights adjacent to each other may be engaged with each other at the weight engaging portion, whereby the load body and the plurality of weights may be sequentially loaded on the test object.

  With such a configuration, it is possible to perform a test in which a load is increased on the DUT in a stepwise manner.

  In the load testing machine according to the invention, the suspension engaging portion of the suspension body and the load body are engaged, and the load body / weight engagement portion of the load body and the weight located at the top are provided. And lowering the second support relative to the first support so that the weight engaging portions of one or more weights counted from above among the plurality of weights are engaged with each other. The load body and the one or more weights are loaded on the suspension body, and then the suspension body and the second support body are attached to the first body so that the pressing portion presses the DUT from above. It may be configured such that the load is lowered relative to one support and the load of the load body and the partial weight is applied to the DUT.

  With such a configuration, it is possible to perform a test in which a load of one or more weights counted from above among a plurality of weights is simultaneously applied.

  The present invention is configured as described above, and has an effect that a highly accurate load test can be performed.

It is a front view which shows the structure of the load testing machine which concerns on embodiment of this invention. It is a principal part enlarged view of the load testing machine of FIG. It is a figure which shows the structure of the hanging tool with which the load testing machine of FIG. 1 is provided, (a) is a side view which shows a hanging tool, (b) is a side view which shows the state which attached the hanging tool to the load testing machine. It is. It is a side view which shows the positional relationship of the through-hole and pin of the suspension tool with which the load testing machine of FIG. 1 is equipped, (a) is a side view which shows the state which the lower inner peripheral surface and pin of the through-hole separated. b) is a side view showing a state in which the lower inner peripheral surface of the through hole is in contact with the pin. It is a flowchart which shows control of the preliminary load test of the load tester of FIG. It is a figure which shows roughly the operation | movement in the preliminary load test of the load testing machine of FIG. It is a figure which shows roughly the operation | movement in the preliminary load test of the load testing machine of FIG. It is a flowchart which shows control of the stage load test of the load tester of FIG. It is a figure which shows roughly the operation | movement in the stage load test of the load testing machine of FIG. It is a figure which shows roughly the operation | movement in the stage load test of the load testing machine of FIG. It is a flowchart which shows control of the partial copper load test of the load tester of FIG. It is a figure which shows schematically the operation | movement in the partial copper load test of the load tester of FIG. It is a figure which shows schematically the operation | movement in the partial copper load test of the load tester of FIG. It is a front view which shows the modification of the load testing machine which concerns on embodiment of this invention.

  Embodiments of a load testing machine according to the present invention will be described below with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals throughout all the drawings, and redundant description thereof is omitted.

[overall structure]
FIG. 1 is a front view showing a configuration of a load tester 100 according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part of the load tester 100 of FIG.

  3A and 3B are diagrams showing the configuration of the hanging tool 6 provided in the load testing machine 100 of FIG. 1, wherein FIG. 3A is a side view showing the hanging tool 6, and FIG. 3B is a drawing showing the hanging tool 6 as a load testing machine. It is a side view showing a state attached to 100.

  4 is a side view showing the positional relationship between the through hole 70 and the pin 72 of the hanger 6 provided in the load tester 100 of FIG. 1, and (a) is a lower inner peripheral surface of the through hole 70 and the pin. FIG. 7B is a side view showing a state in which the pin 72 is in contact with the lower inner peripheral surface of the through hole 70.

  In FIG. 1, a load testing machine 100 includes a support frame 1, a DUT support base (first support) 2, a weight frame (second support) 3, a weight (a plurality of weights) 4, a load A frame (loading body) 5 and a hanging tool 6 (hanging body) are provided. Further, the load testing machine 100 includes a control device 101 at an appropriate place.

  The support frame 1 is a frame body that is formed in a substantially rectangular shape when viewed from the front and is erected on a floor or the like. The support frame 1 supports a DUT support base 2, a weight frame 3, a weight 4, a load frame 5, and a hanging tool 6. A pair of first elevators 81 and second elevators 82 that raise and lower the supported bodies 3 to 6 are provided on the upper portion of the support frame 1. The elevators 81 and 82 are constituted by, for example, screw jacks. The elevators 81 and 82 may be constituted by ball screws, fluid cylinders, or the like.

  The drive shaft (actuator) of each first lift 81 is provided to extend in the vertical direction, and moves up and down the weight frame 3.

  The drive shaft of the second elevator 82 extends in the vertical direction and moves the hanging tool 6 up and down. A connector 85 is attached to the lower end of the drive shaft (actuator) of the second elevator 82 via a known spherical bearing (not shown). The connector 85 is formed in an inverted U shape when viewed from the front, and a groove 86 is formed between both ends. As shown in FIG. 3B, through holes 87 and 87 having a common central axis are formed at both ends of the connector 85 in a direction orthogonal to the groove 86 in plan view, that is, in the horizontal direction. ing.

  As shown in FIG. 1, the DUT support base 2 is provided on a support frame 1 so as to extend in the horizontal direction at a substantially central position in the height direction of the support frame 1. A DUT placement position P is set (assumed) at a substantially horizontal center. Further, a temperature-controlled room 8 capable of setting the temperature and humidity is provided so as to surround the DUT placement position P, and the temperature and humidity in the temperature-controlled room 8 are set in a predetermined environment. Yes.

  The weight frame 3 is a frame formed in a substantially rectangular shape when viewed from the front, and includes an upper support portion 31 that extends in the horizontal direction, a lower support portion 32 that extends parallel to the upper support portion 31, and an upper support portion 31 and a lower support portion. And a pair of connecting portions 33 that connect 32 in the vertical direction. The upper support portion 31 is attached (supported) to the drive shaft of the pair of first elevators 81, whereby the weight frame 3 is configured to be movable up and down by the drive shaft of the first elevator 81. Yes.

  The weight frame 3 has a pair of stoppers 34 provided above the lower support portion 32 in parallel with the lower support portion 32 and projecting inward of the weight frame 3 at each of the pair of connecting portions 33. Yes. The stopper 34 is provided so that the upper surface thereof is positioned higher than the upper surface of the uppermost weight 4 a of the weight 4 stacked on the lower support portion 32.

  As shown in FIG. 2, the weight 4 includes five weights 4 a to 4 e and is stacked on the lower support portion 32 of the weight frame 3.

  The weight 4a located in the uppermost stage has a through hole penetrating in the vertical direction. This through hole has a large-diameter portion, an upper small-diameter portion 41 formed at the upper end of the large-diameter portion with a smaller diameter than the large-diameter portion, and a lower small-diameter formed at the lower end of the large-diameter portion with a smaller diameter than the large-diameter portion. Part 42 is formed.

  The weight 4b adjacent to the lower side of the weight 4a includes a protruding portion 43 (weight engaging portion) that protrudes upward from the upper surface and a recessed portion 44 (weight engaging portion) formed on the lower surface. The protruding portion 43 includes a base portion and a flange portion 45 formed on the upper end of the base portion so as to have a larger diameter than the base portion. The diameter of the flange portion 45 is smaller than the diameter of the main portion of the through hole of the weight 4a and larger than the diameter of the lower small diameter portion 42 of the through hole of the weight 4a. And this flange part 45 is provided so that it may be located in the large diameter part of the through-hole of the weight 4a. Further, in a state where the weights 4a to 4e are stacked on the lower support portion 32, a gap is provided between the lower surface of the flange portion 45 and the upper surface of the lower small diameter portion 42 of the weight 4a, and both are in a non-contact state. It is comprised so that it may become. As a result, when the weight 4a rises relative to the weight 4b, the lower surface of the flange portion 45 of the weight 4b comes into contact with the upper surface of the lower small diameter portion 42 of the weight 4a, and the weight 4b is suspended from the weight 4a. Has been. And the recessed part 44 is formed so that it may have a large diameter part and the small diameter part 46 formed in the lower end of this large diameter part by a smaller diameter than this large diameter part.

  The weights 4c to 4e have the same configuration as the weight 4b. And each flange part 45 is provided so that it may be located in the large diameter part of the recessed part 44 of the weight adjacent adjacent upwards. In the state where the weights 4a to 4e are stacked on the lower support portion 32, a gap is provided between the lower surface of each flange portion 45 and the upper surface of the lower small diameter portion 42 of the weight adjacent to the upper portion. Is configured to be in a non-contact state. Therefore, when a certain weight rises relative to the weight adjacent to the lower side, the lower surface of the flange portion 45 of the weight comes into contact with the upper surface of the small-diameter portion 46 of the weight adjacent to the lower side, and the weight adjacent to the lower side. Is configured to be suspended from the weight.

  As shown in FIG. 1, the load frame 5 is a frame formed in a substantially rectangular shape in front view, and includes an upper support portion 51 extending in the horizontal direction, a lower support portion 52 extending in parallel with the upper support portion 51, and an upper portion It has a pair of connection parts 53 which connect the left and right ends of the support part 51 and the lower support part 52 in the vertical direction.

  A connector 57 is attached to a substantially horizontal center of the upper surface of the upper support 51 via a known spherical bearing. The connector 57 is formed in a U-shape when viewed from the front, and a groove 58 is formed between both ends. At both ends of the connector 57, through holes 59 and 59 having a common central axis are formed in a direction orthogonal to the groove 58 in a plan view, that is, in the horizontal direction.

  Further, the upper support portion 51 has a pressing portion 54 that presses the device under test from the upper side to the lower side at the substantially horizontal center of the lower surface. The pressing portion 54 is located above the DUT placement position P.

  Both ends of the lower support portion 52 are configured to be positioned above the stopper 34, respectively, and the weight frame 3 is raised relative to the load frame 5 to come into contact with the stopper 34. 34 to be supported by 34. Further, the lower support portion 52 is provided with a weight hanging portion 55 (load body / weight engagement portion) protruding downward at a substantially horizontal center of the lower surface. As shown in FIG. 2, the weight hanging portion 55 includes a base portion and a flange portion 56 having a diameter larger than that of the base portion at the tip (lower end) of the base portion. The diameter of the flange portion 56 is smaller than the diameter of the large diameter portion of the through hole of the weight 4a and larger than the diameters of the upper and lower small diameter portions 41 and 42 of the through hole of the weight 4a. The flange portion 56 is provided so as to be located in the large diameter portion of the through hole of the weight 4a. Accordingly, when the weight 4 a is lowered relative to the load frame 5, the lower surface of the upper small-diameter portion 41 abuts on the upper surface of the flange portion 56, and the weight 4 a is suspended from the load frame 5.

  The length dimension from the proximal end to the distal end of the weight hanging portion 55 is the length in the vertical direction from the proximal end of the weight hanging portion 55 to the lower surface of the upper small diameter portion 41 in a state where the load frame 5 is supported by the stopper 34. In this state, the upper surface of the flange portion 56 is not in contact with the lower surface of the upper small-diameter portion 41, and the load of the weight 4 is not applied to the load frame 5.

  The hanger 6 includes heads 67 and 68 at the upper end and the lower end, respectively. The heads 67 and 68 are connected by a bar.

  The head 67 is a thick plate and has a through hole 69 in the thickness direction. As shown in FIGS. 1 and 3, the head 67 is inserted into the groove 86 of the connector 85 and is attached to the connector 85 by the pins 71 inserted through the through holes 87 and 87 and the through hole 69. Yes. As a result, the hanging tool 6 is configured to be movable up and down by the second elevator 82 via the coupling tool 85. The diameter of the pin 71, the diameter of the through holes 87 and 87, and the diameter of the through hole 69 are formed to be substantially the same diameter.

  The head 68 is a thick plate and has a through hole 70 in the thickness direction. The diameter of the through hole 70 is formed larger than the diameter of the through holes 59 and 59 of the load frame 5. The head 68 is inserted into the groove 58 and is attached to the connector 57 by pins 72 inserted through the through holes 59 and 59 and the through hole 70. The diameter of the pin 72 is the same as the diameter of the through holes 59, 59 and is smaller than the diameter of the through hole 70. Therefore, in a state where the load frame 5 is suspended from the suspension 6, as shown in FIG. 4B, the lower inner peripheral surface (suspending engagement portion) of the through hole 70 and the pin 72 are It is comprised so that it may contact | abut. On the other hand, as shown in FIG. 1, in the state where the load frame 5 and the hanging tool 6 are relatively close to each other from the above state, the lower side of the pin 72 and the through-hole 70 as shown in FIG. A gap is provided between the inner peripheral surface, that is, vertically upward of the lower inner peripheral surface of the through-hole 70, and both are configured to be in a non-contact state. Since the lower inner peripheral surface of the through hole 70 functions as a hanging engagement portion, the upper inner peripheral surface of the through hole 70 is not necessarily required. That is, the hanging engagement portion does not need to be in the shape of a hole like the through-hole 70, and may have a shape that can be engaged with the pin 72 in the vertical direction. For example, it may be J-shaped or groove-shaped.

  As described above, the load frame 5 is suspended from the second elevator 82 via the drive shaft of the second elevator 82 and the spherical bearing provided on the upper support portion 51. It is comprised so that the drive shaft of the 2nd elevator 82, the hanging tool 6, and the pin 72 may be located on the vertical line which passes. Further, it is preferable that the center of gravity of the pressing portion 54, the weight hanging portion 55, and the weights 4a to 4e is positioned on a vertical line passing through the center of gravity of the load frame 5.

[Configuration of control system]
The control device 101 controls the operation of the pair of first elevator 81 and second elevator 82 in order to move the weight frame 3 and the hanging tool 6 up and down. A controller (for example, CPU) for controlling the operation of the device 81 and the second elevator 82, a storage unit (for example, ROM, RAM, etc.) for storing various data or control programs, and data such as various conditions are input. An input device and an output device (for example, a display, a printer, a data output terminal, etc.) for outputting processed data are provided. The control unit is a function realized by executing a control program stored in the storage unit. Further, the load signal detected and output by the compression load cell A which is a device under test is input to the control unit via an A / D converter (not shown), processed there appropriately, and stored in the storage unit, or Output from the output device.

[Example of operation]
Next, an operation example of the load tester 100 will be described.

  First, as shown in FIG. 1, before starting a load test, the compression type load cell A which is a test object is mounted on the test object mounting position P. As shown in FIG. Then, the temperature and humidity of the temperature-controlled room are set to predetermined values.

  In the initial state, the control unit (hereinafter simply referred to as the control unit) of the control device 101 positions the weight frame 3 at the initial position of the weight frame via the first elevator 81 and the second elevator 82. The hanging tool 6 is positioned at the initial position of the hanging tool. The weight frame initial position and the hanging tool initial position are set by operating an input device (not shown) and inputting it to the control device 101, for example.

The weight frame initial position (first reference position) and the hanging tool initial position (second reference position) are stacked with the weights 4a to 4e on the lower support portion 32, the load frame 5 is supported by the stopper 34, and penetrates. The lower inner peripheral surface of the hole 70 and the pin 72 are not in contact with each other, and the dimension T1 (see FIG. 4A) between the lower inner peripheral surface of the through hole 70 and the pin 72 is the pressing portion 54. The position relative to the DUT support base 2 is set to be smaller than the dimension T2 of the gap between the load cell A and the apex of the strain body. Therefore, in the initial state, the load of the weight 4 is applied to the lower support portion 32, and the load of the load frame 5 is applied to the stopper 34, that is, the weight frame 3. On the other hand, the load cell A and the hanging tool 6 are in an unloaded state.
<Operation example of preliminary load test>
Next, an operation example in the case of performing a preliminary load test in which the load 4 is loaded with the weights 4a to 4e of the weight 4 and the load 5 at the same time will be described.

  FIG. 5 is a flowchart showing the control of the preliminary load test of the load tester 100, and shows an operation example of the load tester 100.

  6A and 6B are diagrams schematically showing the operation of the load tester 100 in the preliminary load test.

  The control unit lowers the weight frame 3 from the initial state. Then, the load frame 5 supported by the stopper 34 of the weight frame 3 is lowered as the weight frame 3 is lowered, and the suspending tool 6 and the load frame 5 are relatively moved away from each other. Then, the lower inner peripheral surface of the through hole 70 of the hanger 6 and the pin 72 are brought into contact with each other (see FIG. 4B), and the load frame 5 is lowered as the weight frame 3 is lowered. No longer. As a result, the lower support portion 52 of the load frame 5 is separated from the stopper 34, and the load frame 5 is suspended from the hanging tool 6, and the entire load of the load frame 5 is loaded onto the hanging tool 6. . In this state, since the load frame 5 and the weight 4 remain in a non-contact state, only the load of the load frame 5 is applied to the hanging tool 6. When the weight frame 3 is further lowered, the weight 4 placed on the lower support portion 32 of the weight frame 3 is lowered as the weight frame 3 is lowered. As a result, the load frame 5 The weight 4 moves relatively away from each other. Then, the upper surface of the flange portion 56 of the load frame 5 and the lower surface of the upper small diameter portion 41 of the weight 4a are brought into contact with each other, and the weight 4a does not descend as the weight frame 3 is lowered. On the other hand, the weights 4b to 4e are lowered as the weight frame 3 is lowered, and are separated from the weight 4a. As a result, the weight 4 a is suspended from the load frame 5, and the entire load is applied to the hanging tool 6. When the weight frame 3 is further lowered, the lower surface of the flange portion 45 of the weight 4b and the upper surface of the lower small diameter portion 42 of the weight 4a come into contact with each other, and the weight 4b is suspended from the weight 4a. Then, the weight 4b is further loaded on the hanging tool 6. Then, by further lowering the weight frame 3, the weight 4c, the weight 4d, and the weight 4e are also engaged with each other and are suspended from the load frame 5. In this way, the control unit lowers the weight frame 3 and places the weight frame in a position where the load frame 5 and the weights 4a to 4e are suspended from the hanging tool 6, as shown in FIG. 4A. Position (S101). The position is a position where the weight 4e does not contact the lower support portion 32 even after the hanging tool 6 is lowered in the next step S102.

  Next, the control unit lowers the hanging tool 6. Then, the load frame 5 and the weights 4 a to 4 e suspended from the hanging tool 6 are lowered as the hanging tool 6 is lowered. Then, the pressing portion 54 of the load frame 5 presses the strain body of the load cell A from above, and the entire load of the weight 4 and the load frame 5 is loaded on the load cell A. As a result, the load frame 5 does not descend as the hanging tool 6 is lowered. Therefore, when the hanging tool 6 is further lowered, the lower inner peripheral surface of the through hole 70 and the pin 72 are separated (FIG. 4). (See (a)), and the load 4 is loaded with the entire load of the weight 4 and the load frame 5. In this way, the control unit lowers the hanging tool 6 and positions the weight frame at a position where the entire load of the weight 4 and the load frame 5 is loaded on the load cell A as shown in FIG. 4B. (S102).

  Next, the control unit measures the load detected by the load cell A (S103).

  Next, the control unit positions the weight frame 3 at the initial position of the weight frame, positions the hanging tool 6 at the initial position of the hanging tool, and ends the preliminary load test (S104).

In the creep test, the test is performed in the same manner as in the above operation example.
<Example of stage load test operation>
Next, an operation example in the case of performing a step load test in which the load is applied to the load cell A by increasing the load step by step will be described.

  FIG. 7 is a flowchart showing the control of the stage load test of the load tester 100, and shows an operation example of the load tester 100.

  8A and 8B are diagrams schematically showing the operation of the load tester 100 in the step load test.

  From the initial state, the control unit lowers the weight frame 3 and the hanging tool 6 in synchronization so that the relative positions of each other do not change. That is, the weight frame 3 and the hanging tool 6 are lowered while maintaining the dimension T1 (see FIG. 4A) of the gap between the lower inner peripheral surface of the through hole 70 and the pin 72. Thereby, the pressing part 54 presses the strain body of the load cell A from above, and the entire load of the load frame 5 is applied to the load cell A. Accordingly, the load frame 5 does not descend as the weight frame 3 and the hanging tool 6 are lowered. Therefore, when the weight frame 3 and the hanging tool 6 are further lowered, the stopper 34 and the load frame 5 of the weight frame 3 are lowered. The lower support portion 52 is separated, and the load cell 5 is fully loaded on the load cell A. In this way, the control unit lowers the weight frame 3 and the hanging tool 6 in synchronization, and the weight frame is placed at a position where the entire load of the load frame 5 is loaded on the load cell A as shown in FIG. 5A. 3 and the hanging tool 6 are positioned (S201).

  Next, the control unit measures the load detected by the load cell A (S202).

  Next, the control unit determines whether the weight frame 3 is located at the set end position (S203).

  Here, when it is determined that the weight frame 3 is located at the end position, the control unit positions the weight frame 3 at the weight frame initial position, and positions the hanging tool 6 at the hanging tool initial position. The step load test is terminated (S204).

  On the other hand, when it is determined that the weight frame 3 is not located at the end position, the control unit lowers the weight frame 3 by one step (S205). This “one step” is a distance by which the weight frame 3 is lowered in order to increase the weight loaded on the load cell A by one. That is, in a state where only the load of the load frame 5 is applied to the load cell A, the upper surface of the flange portion 56 of the load frame 5 and the lower surface of the upper small diameter portion 41 of the weight 4a come into contact with each other to engage with each other. Is suspended from the load frame 5, while the weight 4a and the weight 4b are in a non-contact state, and the weight frame 3 is lowered until the entire load of the weight 4a is further loaded on the load cell A. As a result, the weight 4a is suspended from the weight hanging portion 55.

Next, the control unit again measures the load detected by the load cell A (S202), and determines whether the weight frame 3 is located at the set end position (S203). Then, steps S205, S202, and S203 are repeated until it is determined that the weight frame 3 is located at the end position. In this way, a step load test is performed.
<Example of partial copper load test>
Next, an operation example in the case of performing a partial copper load test in which a load of a partial weight of the weight 4 is simultaneously applied to the load cell A will be described.

  FIG. 9 is a flowchart showing control of a partial copper load test of the load tester 100, and shows an operation example of the load tester 100.

  10A and 10B are diagrams schematically showing the operation of the load tester 100 in a partial copper load test.

  Hereinafter, in this operation example, a case where the load cell A is loaded with the weights 4a and 4b will be described.

  The control unit lowers the weight frame 3 from the initial state. In the preliminary load test, the weight frame 3 was lowered until all the weights of the weight 4 were suspended from the hanging tool 6, but in this test, the weight 4a and the weight 4b were suspended. The weight frame 3 is lowered until it is in a state of being suspended by 6. In this way, the control unit lowers the hanging tool 6, and the weight frame 5, the weight 4 a and the weight 4 b are in a position where the weight frame 4 is suspended from the hanging tool 6 as shown in FIG. 10A. 3 is positioned (S301).

  Next, the control unit lowers the weight frame 3 and the hanging tool 6 in synchronization so that the relative positions of each other do not change. Then, the pressing part 54 presses the strain body of the load cell A from above. In this way, the control unit lowers the weight frame 3 and the hanging tool 6 in synchronization so that the relative positions of the weight frame 3 and the hanging tool 6 do not change, and as shown in FIG. 10B, the pressing portion 54 of the load frame 5 and the load cell A A weight frame is positioned at a position where the strain generating body comes into contact (S302).

  Next, the control unit lowers the hanging tool 6 by a distance T1 (S303). Then, as described above, since the pressing portion 54 and the strain body of the load cell A are in contact with each other, the load frame 5 (and the weights 4a and 4b) does not descend with the lowering of the suspension 6 and penetrates. The lower inner peripheral surface of the hole 70 is separated from the pin 72 (see FIG. 4A), and the entire load of the load frame 5, the weight 4a, and the weight 4b is applied to the load cell A.

  Next, the control unit measures the load detected by the load cell A (S304).

  Next, the control unit positions the weight frame 3 at the initial position of the weight frame, positions the hanging tool 6 at the initial position of the hanging tool, and ends the partial copper load test (S305).

  As described above, according to the load testing machine 100 of the present embodiment, the weights 4a to 4a, which raise and lower the weight frame 3 and the hanging tool 6, change their relative positions and suspend the weight frame 4a to the load frame 5. The number of weights 4e can be changed. Moreover, the load cell A can be switched to a load state or a no-load state by raising / lowering the weight frame 3 and / or the hanging tool 6, and changing each relative position with respect to the to-be-tested object support stand 2. FIG. Further, when the load 6 is loaded, the hanging tool 6 is lowered, and a clearance is provided between the pin 72 and the lower inner peripheral surface of the through hole 70, and the load frame 5 and the load frame 5 are suspended. The entire load of the lowered weight 4 can be applied to the load cell A. Therefore, it is possible to perform multiple tests, such as a test in which a plurality of weights are loaded on the DUT at the same time, a test in which the load is increased by increasing the load on the DUT without requiring a dedicated jig. it can.

<Modification>
FIG. 11 is a front view showing a modification of the load testing machine 100 according to the embodiment of the present invention.

  In the above, the pin 72 and the lower inner peripheral surface of the through hole 70 are configured to be in a non-contact state when the load frame 5 is relatively brought close from the state where the load frame 5 is suspended from the hanging tool 6. However, the present invention is not limited to this. For example, as shown in FIG. 11, the hanger 106 has a base portion and a flange portion 168 formed with a diameter larger than the base portion at the lower end of the base portion, and the connection portion 157 of the load frame 105 has an upper surface. Opened and formed into a cylindrical shape with the bottom closed, and further, the internal space of the connecting portion forms a large diameter portion and a small diameter portion 154 formed at a lower diameter than the large diameter portion at the upper end of the large diameter portion. When the flange portion 168 is positioned in the internal space of the connecting portion 157 and the load frame 105 and the hanging tool 106 are relatively close to each other, a gap is provided between the small diameter portion 154 and the flange portion 168. May be.

  In the above description, the lower support portion 52 of the load frame 5 is configured to come into contact with the stopper 34 of the weight frame 3 and be supported by the weight frame 3, but this is not a limitation. For example, a support leg that is in contact with the upper surface of the weight 4a and is supported by the weight frame 3 or that is longer than the height of the weight 4 protruding below the lower support portion 52 is provided. You may comprise so that a leg may contact | abut to the lower part support part 32 of the weight frame 3, and it may be supported by the weight frame 3. FIG.

  In the above description, the hanging tool 6 is moved up and down to change the relative positional relationship between the hanging tool 6 and the weight frame 3 and the relative positional relationship between the hanging tool 6 and the DUT support base 2. However, the present invention is not limited to this, and the DUT support base 2 is moved up and down, and the relative positional relationship between the hanger 6 and the weight frame 3, the hanger 6 and the DUT support. You may comprise so that the relative positional relationship with the stand 2 may be changed.

  In the above description, the test is automatically performed under the control of the control apparatus 101. However, the test may be performed by a human operation.

  Note that the load tester 100 can be used for a load test of a tensile load cell when the hanging tool 6 is a known tensile load cell.

  From the foregoing description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the foregoing description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of the structure and / or function may be substantially changed without departing from the spirit of the invention.

  The load tester of the present invention is useful for load test applications such as load cells.

DESCRIPTION OF SYMBOLS 1 Support frame 2 Specimen support stand 3 Weight frame 4 Weight 4a Weight 4b Weight 4c Weight 4e Weight 5 Load frame 6 Suspension tool 7 Controller 8 Temperature-controlled room 31 Upper support part 32 Lower support part 33 Connection part 34 Stopper 41 Upper part Small diameter part 42 Lower small diameter part 43 Projection part 44 Recessed part 45 Flange part 46 Small diameter part 51 Upper support part 52 Lower support part 53 Connection part 54 Press part 55 Weight hanging part 56 Flange part 57 Connection tool 58 Groove part 59 Through hole 67 Head part 68 Head 69 Through-hole 70 Through-hole 71 Pin 72 Pin 81 First elevator 82 Second elevator 85 Connector 86 Groove 87 Through-hole 100 Load tester

Claims (4)

A first support for supporting the device under test;
A second support capable of moving up and down relative to the first support and setting a first reference position with respect to the first support;
Adjacent weights each have a weight engaging portion that engages with each other in the vertical direction, and the weight engaging portion has a gap in the vertical direction when the second support is located at the first reference position. A plurality of weights stacked on the second support,
A pressing portion that is located above the first support and presses the DUT supported by the first support from above and engages in the vertical direction with a weight located at the top of the plurality of weights. A load body / weight engaging portion, and the second support body having a vertical gap in the load body / weight engaging portion in a state where the second support body is located at the first reference position. A load body supported by
A suspension engaging portion that engages with the load body in a vertical direction, and is moved up and down relatively with respect to the first support body, and a second reference position with respect to the first support body can be set; and A load testing machine comprising: a suspended body having a vertical gap in the suspended engagement portion at the second reference position. The suspension engaging portion of the suspension body and the load body are engaged, the load body / weight engagement portion of the load body is engaged with the uppermost weight, and the plurality of weights Lowering the second support relative to the first support so as to engage the weight engaging portions with each other, and applying the load of the load body and the plurality of weights to the suspension body,
Thereafter, the suspension body is lowered relative to the first support so that the pressing portion presses the device under test from above, and the load of the load body and the plurality of weights is applied to the device under test. The load testing machine according to claim 1, wherein the load testing machine is configured to be loaded on a load. Relative to the first support body, the suspension body and the second support body are maintained while maintaining a vertical gap in the load body / weight engaging portion so that the pressing portion presses the DUT from above. To load the load to the test object,
Thereafter, relatively the second support member so that Ru engaged and weight of most located above one of said plurality of weight and load body / weight engagement portion of the load member relative to the first support member And, after that, among the plurality of weights, the weights positioned on the upper side are sequentially engaged with the weights adjacent to the lower side in the weight engaging portion, whereby the load object and the test object are The load testing machine according to claim 1, wherein the load testing machine is configured to sequentially load the plurality of weights. The suspension engaging portion of the suspension body and the load body are engaged, the load body / weight engagement portion of the load body is engaged with the uppermost weight, and the plurality of weights The second support body is lowered relative to the first support body so that the weight engaging portions of one or more weights counting from above are engaged with each other, and the load body is attached to the suspension body. And applying a load of the one or more weights,
Thereafter, the suspension body and the second support body are lowered relative to the first support body so that the pressing portion presses the DUT from above, and the load body and the partial weight are The load testing machine according to claim 1, wherein the load testing machine is configured to apply a load of 1 to the DUT.

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