JP6933910B2 - Durability test equipment - Google Patents

Description

The present invention relates to a durability test apparatus for performing a durability test of an object to be tested such as an elastic member.

In the construction of various infrastructure facilities such as RC high bridges and PC high bridges and large concrete structures such as super high-rise buildings, when transferring concrete from a concrete source such as a concrete pump truck to the actual concrete placement position, it is vertical. It is often the case that the concrete is dropped and transferred over a long distance in the direction, but as the falling distance increases, the falling speed of the concrete increases, and the concrete collides with the inner wall of the transfer pipe and the place of placement at high speed. .. In response to the problem that concrete separates into coarse aggregate and mortar (mixture of fine aggregate and cement) when concrete collides with the casting site at high speed in this way, Patent Document 1 describes material separation of concrete. A concrete transfer pipe having an excellent suppressing effect and in which the inside of the transfer pipe is not blocked by the transferred concrete is disclosed.

Specifically, it is supported by a hollow pipe body and a plurality of support members extending hollowly from the inner wall surface of the pipe body, and is supported by a central pedestal located in the center of the hollow and a plurality of pedestals. A first elastic member having one opening and extending to the inner wall surface, and a first elastic member placed on the first elastic member, extending to the inner wall surface, closing a part of the first opening, and the first It is composed of a second elastic member forming a second opening having a smaller flat area than the first opening inside the opening, and the first and second elastic members are deformed in the hollow with the central pedestal as a fulcrum. It is a free concrete transfer pipe. In this concrete transfer pipe, both the first and second elastic members that are partially wrapped with each other extend from the central pedestal in the center of the pipe body to the inner wall surface of the pipe body, and the opening (first) of the first elastic member. A second opening having a relatively small flat area of the second elastic member is arranged inside the opening), and the first and second elastic members are deformable in the tip region on the inner wall surface side thereof. With this configuration, the speed of the falling concrete can be relaxed by the elastic deformation of the first and second elastic members. Further, since the second elastic member extends from the first opening edge into the first opening and the second opening of the second elastic member is formed in the first opening, the opening area is narrowed. Therefore, it is possible to prevent only the coarse aggregate forming the concrete from falling.

Japanese Unexamined Patent Publication No. 2016-155638

By the way, in manufacturing the concrete transfer pipe described in Patent Document 1, it is extremely important to verify the durability of the elastic member which is a component thereof. Therefore, the durability test should be performed by various conventional test methods. Is being considered. One of the test methods is the scraping test method for coarse aggregate by the Los Angeles testing machine specified in JIS A 1121. Although this test method has already been widely applied and its reliability is high, it is not possible to grasp the durability of the test object by using the aggregate as described above in this test method. On the other hand, as another test method, there is an abrasion resistance test (Akron abrasion test) of vulcanized rubber and thermoplastic rubber specified by JIS K6264. This test is a test in which a wear material is pressed against a rotating test piece to verify wear resistance, but it is not possible to reproduce the case where an impact is applied to a cantilevered test piece as described above.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a durability test apparatus capable of accurately testing the durability of a cantilevered test piece, for example.

In order to achieve the above object, the durability test device according to the present invention is a durability test device for a test piece, and accommodates a cylinder having a rotation axis and the cylinder, and the outer circumference of the cylinder. The cylindrical body is provided by a case having an annular gap between the surface, an actuator that rotates the cylindrical body around the center of rotation, a slide mechanism arranged inside the cylindrical body, and the slide mechanism. It is provided with a scooping member that goes in and out of the annular gap from the opening opened in the above, and a control unit that executes and controls the extension of the scooping member into the annular gap and the pulling into the cylindrical body by the slide mechanism. The test piece is attached to a part of the inner surface of the case facing the annular gap, and the control unit causes the scooping member to be downstream of the test piece in the direction of rotation of the cylinder. A scooping material is scooped over the annular gap and below the annular gap, and a control is executed in which the scooping member is pulled into the cylindrical body on the upstream side of the test object in the rotation direction of the cylindrical body. It is a thing.

The durability test device of the present invention is a device that performs a durability test of the test object by repeatedly colliding the scooping material with the test object, and is a slide mechanism from a cylindrical body rotatably housed in the case. The scooping member is configured to enter and exit the annular gap between the cylinder and the case. The scooping member projects from the cylindrical body to scoop the scooping material below the annular gap, and the scooping material scooped by the rotation of the cylindrical body is automatically transported to a predetermined location in the annular gap, and the scooping material is automatically transported from the predetermined location. Is to be freely dropped and collided with the test piece fixed at an arbitrary position in the annular gap while giving inertia due to the rotation of the cylindrical body.

Since the test piece is fixed at an arbitrary position in the annular gap, if the scooping member projects from the cylindrical body into the annular gap, the scooping member collides with the test piece during the rotation of the cylindrical body, and the test piece is subject. The test piece may be damaged by this collision, and the durability of the test piece cannot be accurately specified. Therefore, a scooping member projects into the annular gap on the downstream side of the test piece in the rotation direction of the cylindrical body to scoop the scooping material below the annular gap, and the upstream side of the test piece in the rotation direction of the cylinder. By executing the control of the scooping member being pulled into the cylindrical body by the control unit, it is possible to eliminate the interference between the continuously rotating scooping member and the test object.

In the above-mentioned overhang control and pull-in control of the scooping member, for example, when a belt drive method using a servomotor is applied as an actuator for rotating a cylindrical body, the rotation angle according to the overhang and pull-in timing of the scooping member is set. It can be set, and when the rotation angle of the rotation axis of the cylinder reaches the set rotation angle, a command signal is transmitted to the slide mechanism via the control unit or the like.

In this way, the continuous rotation of the cylindrical body, the overhanging of the scooping member into the annular gap during each rotation, and the pulling into the cylindrical body are executed to provide the scooping material to the test object (cylinder). It becomes possible to repeatedly execute (collision due to free fall given inertia by body rotation).

Here, the shape of the case for accommodating the cylindrical body is not particularly limited, but considering the ease of scooping by the scooping member of the scooping material below the annular gap, a hollow disk having a diameter larger than that of the cylindrical body is considered. It is preferable that the shape and the shape and dimensions of the test device are the same as those of the inner space of the test device. Further, as the test piece, in addition to the elastic member applied to the concrete transfer pipe described above, there are various targets such as a hardened mortar body and a hardened concrete body. Examples of the scooping material include gravel, sand, crushed mortar, and steel balls, and the material and size of the scooping material are appropriately selected according to the test object to be tested. When the test object is an elastic member, the test object is attached to the inner surface of the case facing the annular gap in a cantilevered state, and the scooping material is continuously applied to the cantilevered test object. Provided, the durability time or the number of times of durability is measured by this durability test device. On the other hand, when the test piece is a hardened mortar body or a hardened concrete body, the test piece is fixed near the lower surface of the outer periphery of the case and the clearance of the scooping member is adjusted to increase the inertia due to the rotation of the cylindrical body. With the given free drop, the durability time or the number of times of durability of the wear in the tangential direction of the test piece is measured by this durability test device.

Examples of the actuator that rotates the cylindrical body around the center of rotation include various motors such as a servomotor and a rack and pinion type rotary actuator. Further, examples of the slide mechanism include an air cylinder and a hydraulic cylinder, but since the structure and maintenance are simple and the weight of the test object to be tested is generally not large, the air cylinder is used. Is preferred.

Further, in another embodiment of the durability test device according to the present invention, a sensor is attached to a predetermined position of the durability test device, and when the scooping member is detected by the sensor, the detection signal is transmitted. A command signal is transmitted to the control unit, and the control unit that receives the detection signal transmits a command signal to the slide mechanism to extend the scooping member into the annular gap and pull the scooping member into the cylindrical body. be.

In this embodiment, when a sensor mounted at a predetermined position of the durability test device detects a scooping member, a detection signal is transmitted to the control unit, and the control unit sends the detection signal to the slide mechanism based on the detection signal. By transmitting a command signal for operation, the scooping member is taken in and out. For example, an L-shaped sensor light-shielding plate with an angle of 90 degrees between the two pieces (the two pieces have a phase of 90 degrees) is attached to the center of rotation of the cylindrical body, and this sensor light-shielding plate is attached. A sensor is provided at a position where the sensor passes, and when one piece of the L-shaped sensor shading plate passes through the sensor and the sensor detects the other piece, a detection signal is transmitted to the control unit to transmit the detection signal to the control unit. Sends a command signal to the slide mechanism to pull the scooping member into the cylindrical body. Further, after the stored scooping member passes through the test object and rotates 90 degrees, when the sensor detects the other piece of the L-shaped sensor shading plate, a detection signal is transmitted to the control unit for control. A control mode in which a command signal for executing the extension of the scooping member into the annular gap is transmitted from the unit to the slide mechanism. Further, as another form, the scooping member exhibits an L-shaped side view, and when one piece of the L-shaped scooping member is detected by the sensor, the scooping member is pulled into the cylindrical body to execute the L-shaped scooping member. Another example is a control mode in which the scooping member is projected into the annular gap when the sensor detects the other piece of the scooping member.

In this way, by applying a sensor shading plate or scooping member that has a shape that corresponds to the phase of the scooping member in and out (a shape that has two pieces with angles that correspond to the phase), one sensor can be used with high accuracy. , It becomes possible to execute the control of entering and exiting the annular gap and the cylindrical body of the scooping member having a desired phase.

Here, when the cylinder rotates counterclockwise, the test object is attached to a position of 270 degrees from the rotation axis of the cylinder on the inner surface of the case, and the cylinder rotates clockwise. When rotating, it is preferable that the test piece is attached to the inner surface of the case at a position 90 degrees from the rotation axis of the cylinder.

This is the case, for example, when the case and the cylinder are viewed from the front and the test object is attached to the inner surface of the case at a position of 270 degrees from the rotation axis of the cylinder. When viewed from the back of the cylinder, it is mounted at a position 90 degrees from the center of rotation of the cylinder, so the mounting position of the test piece changes 180 degrees depending on whether the case or the like is viewed from the front or the back. This means that there is virtually no difference in the mounting position of the test piece. It means that the test piece is attached at the intersection of the horizontal line passing through the rotation axis of the cylinder and the inner surface of the case at both the position of 270 degrees and the position of 90 degrees from the rotation axis of the cylinder. There is. This is a durability test device that simulates the case where the test object is mounted in the horizontal direction at the mounting position, such as the elastic member constituting the concrete transfer pipe described above. Therefore, when simulating the case where the test piece is mounted at the mounting position at a predetermined tilt angle, the test piece is mounted on the inner surface of the case facing the annular gap at an angle corresponding to the tilt angle, and the durability test device is used. Should be configured.

Further, a preferred embodiment of the durability test apparatus according to the present invention is a form in which the case is transparent or translucent so that the inside can be visually recognized.

Since the inside of the case is visible, various states inside the case from the outside of the case, for example, the state of the test piece, the scooping member is taken in and out well, or the scooping material has an annular gap. It is possible to confirm whether or not the cylinder is clogged at any part of the inside and hinders the rotation of the cylinder. Therefore, it is possible to prevent damage to the test apparatus and to specify the durability time (or the number of times of durability) of the test object with high accuracy.

Further, in another embodiment of the durability test apparatus according to the present invention, the case has a half-split structure, and two half-split cases can be opened and closed via hinges, and one of the half-split cases Is opened so that the scooping material is accommodated in the annular gap.

The case has a half-split structure, and the lower half-split case is fixed to the floor surface of the test room, etc., and the upper half-split case is configured to open wide with respect to the lower half-split case via a hinge. As a result, a desired amount of scooping material can be easily accommodated in a desired position of the lower half-split case, and further, removal and maintenance of the cylindrical body in the case can be facilitated.

As can be understood from the above description, according to the durability test apparatus of the present invention, continuous rotation of the cylindrical body in the case, overhang of the scooping member into the annular gap during each rotation, and pulling into the cylindrical body. By executing, it is possible to repeatedly provide the scooping material to the test piece while eliminating the interference between the continuously rotating scooping member and the test piece, and the durability test of the test piece can be performed. It is possible to perform it accurately and efficiently.

It is a front view of one Embodiment of the durability test apparatus of this invention. FIG. 1 is a view taken along the line II in FIG. 1, which is a plan view of the cylinder mechanism and the scooping member as viewed from above. It is a schematic diagram explaining the pulling control of a scooping member into a cylindrical body by taking out a scooping member and a test object. It is the schematic diagram which took out the scooping member and the test object, and explained the overhang control of a scooping member into an annular gap.

Hereinafter, embodiments of the durability test apparatus of the present invention will be described with reference to the drawings. In the illustrated example, an elastic member applied to a concrete transfer pipe is shown as a test target, but the test target of the durability test apparatus of the present invention is various other than this, such as a hardened mortar body and a hardened concrete body. It goes without saying that various members are the subject of the test. Further, the illustrated example shows a mode in which a detection signal is transmitted from the sensor to the control unit when each piece of the L-shaped sensor shading plate attached to the rotation axis of the cylinder passes through the sensor. In addition to this, there may be a control mode in which a detection signal is transmitted from the sensor to the control unit when the sensor detects each piece of the L-shaped side view scooping member. Furthermore, the rotation angle is calculated by a servomotor that rotates the cylindrical body, the position of the scooping member is specified based on the calculated rotation angle, and the scooping member is placed in the annular gap so as not to interfere with the test object. It may be a control mode in which the overhang and the pulling into the cylindrical body are executed.

(Embodiment of Durability Test Device)
FIG. 1 is a front view of an embodiment of the durability test apparatus of the present invention, and FIG. 2 is a view taken along the line II of FIG. 1 and is a plan view of a cylinder mechanism and a scooping member as viewed from above. .. Further, FIG. 3 is a schematic view illustrating control of drawing the scooping member and the test object into the cylindrical body mainly by taking out the scooping member and the test object, and FIG. 4 is a schematic diagram in which the scooping member and the test object are mainly taken out and the annular gap of the scooping member. It is a schematic diagram explaining the overhang control to.

As shown in FIG. 1, the durability test apparatus 10 includes a cylindrical body 2 having a rotation axis 2a, a case 1 for accommodating the cylindrical body 2, and a slide mechanism 3 arranged inside the cylindrical body 2. , The scooping member 4 attached to the slide mechanism 3 and the control unit 5 are roughly composed of the scooping member 4.

The cylindrical body 2 is rotated in the case 1 about the rotation axis 2a by an actuator such as a motor (not shown) (X2 direction).

A slide mechanism 3 is fixed to the inner surface of the cylindrical body 2. As shown in FIG. 2, the slide mechanism 3 is composed of an air cylinder unit, and a side view L-shaped jig 3e is attached to the rear end of the piston 3a that slides in the cylinder 3b, and is attached to the jig 3e. A plate-shaped scooping member 4 is attached.

An opening 2b is provided in the cylindrical body 2, and the scooping member 4 projects to the outside of the cylindrical body 2 through the opening 2b according to the slide of the piston 3a of the air cylinder unit 3 (in the Y1 direction), or the cylindrical body 2 It is pulled in (Y2 direction). Specifically, as shown in FIG. 2, the piston 3a is pushed to the left side in the drawing by providing air into the cylinder 3b from an air supply source (not shown) via the overhanging air pipe 3c (Y1 direction). ), The scooping member 4 also slides to the left in response to the movement of the piston 3a to the left (Y1 direction).

On the other hand, air is provided into the cylinder 3b from an air supply source (not shown) via a pull-in air pipe 3d, so that the piston 3a is pushed to the right side in the drawing (Y2 direction) and moves to the right side of the piston 3a. The scooping member 4 also slides to the right (Y2 direction) accordingly.

The case 1 has a circular disk shape with a larger diameter than the cylindrical body 2 when viewed from the front, and the entire case is transparent and the inside is visible. Further, the case 1 has a half-split structure, the lower half-split case 1B is fixed to the floor surface of the test room or the like, and the upper half-split case 1A is fixed to the lower half-split case 1B via a hinge 1a. Is configured to open wide (X1 direction).

An annular gap G is formed between the case 1 and the cylindrical body 2, and the half-split case 1A is opened to accommodate a scooping material S such as gravel, sand, or a crushed mortar under the annular gap G.

The test piece W is stretched in the annular gap G at the intersection of the horizontal line L passing through the rotation axis 2a of the cylinder 2 and the inner surface of the case 1 at a position of 270 degrees about the rotation axis 2a of the cylinder 2. It is attached to the case 1 via the jig J so that it can be pulled out.

Here, the test piece W is an elastic member applied to, for example, the concrete transfer pipe described in Patent Document 1. Since the test piece W is an elastic member applied to a concrete transfer pipe, gravel, sand, a crushed body of mortar, or the like is applied to the scooping material S that is dropped and collided with the test body W. In the case of other members, the scooping material S having a material and size suitable for the intended use is applied.

As shown in FIGS. A sensor 6 is provided at the position where the sensor 6 is used. As shown in FIG. 3, the cylindrical body 2 is rotated about the rotation axis 2a by an actuator (not shown), and the scooping member 4 reaches a predetermined position on the upstream side of the test object W in the rotation direction (X2 direction). When one piece 7a of the sensor shading plate 7 passes through the sensor 6 and blocks the sensor 6 (in the Q1 direction), the sensor 6 detects the one piece 7a. The sensor 6 that has detected one piece 7a transmits a detection signal to the control unit 5 (Q2 direction), and the control unit 5 pulls the scooping member 4 into the cylindrical body 2 (Y2 direction) from the slide mechanism 3 to the slide mechanism 3. A command signal to be executed is transmitted. More specifically, when a command signal is transmitted to the slide mechanism 3, air is provided into the cylinder 3b from an air supply source (not shown) via a lead-in air pipe 3d, and responds to the movement of the piston 3a. The scooping member 4 is pulled into the cylindrical body 2.

The predetermined position on the upstream side of the test piece W is the position of the angle θ1 in FIG. 1, and 40 degrees can be set as this angle θ1. That is, the scooping member 4 scoops the scooping material S below the annular gap G in the middle of rotation, and when the scooping material S passes the 0 degree position, the scooping material S has inertia due to the rotation of the cylindrical body 2 and is the object to be tested. It is freely dropped into W, and the scooping member 4 is pulled into the cylindrical body 2 at a position where the angle θ1 is 40 degrees (a position of 310 degrees clockwise from vertically above the rotation axis 2a).

In this way, the scooping member 4 is pulled into the cylindrical body 2 on the upstream side of the test object W in the rotation direction thereof, so that interference between the rotating scooping member 4 and the test body W is avoided.

Next, as shown in FIG. 4, the scooping member 4 stored in the cylindrical body 2 passes through the test object W, and the scooping member 4 is predetermined on the downstream side of the test body W in the rotation direction (X2 direction). When the position is reached and the other piece 7b of the sensor shading plate 7 passes through the sensor 6 to block the sensor 6 (in the Q3 direction), the sensor 6 detects the other piece 7b. The sensor 6 that has detected the other piece 7b transmits a detection signal to the control unit 5 (Q4 direction), and executes the extension of the scooping member 4 from the control unit 5 to the annular gap G (Y1 direction) from the control unit 5 to the slide mechanism 3. A command signal is transmitted. More specifically, when a command signal is transmitted to the slide mechanism 3, air is provided into the cylinder 3b from an air supply source (not shown) via an overhanging air pipe 3c, and responds to the movement of the piston 3a. The scooping member 4 is projected into the annular gap G. The predetermined position on the downstream side of the test piece W is the position of the angle θ2 in FIG. 1, and 50 degrees can be set as this angle θ2 (the position of 220 degrees clockwise from the vertical upper side of the rotation axis 2a). ), The phase corresponds to 90 degrees from the position where the scooping member 4 is pulled in.

The durability of the test object W is specified by executing the above operation at a predetermined rotation speed or a predetermined time and measuring the durability number or the durability time of the test object W.

According to the illustrated durability test apparatus 10, continuous rotation of the cylindrical body 2 in the case 1, extension of the scooping member 4 into the annular gap G during each rotation, and pulling into the cylindrical body 2 are executed. By doing so, it is possible to repeatedly provide the scooping material S to the test body W while eliminating the interference between the continuously rotating scooping member 4 and the test body W, and the durability of the test body W can be increased. The sex test can be performed accurately and efficiently.

Further, since the inside of the case 1 is visible, various states inside the case 1 from the outside of the case 1, for example, the state of the test object W (whether the test body W is excessively bent or the test body is not bent or the test body is not bent excessively). (Whether W is close to the durability limit, etc.), the scooping member 4 is taken in and out well, or the scooping material 4 is clogged at an arbitrary place in the annular gap G and hinders the rotation of the cylindrical body 2. You can check if it is not done. Therefore, it is possible to prevent damage to the durability test device 10 and to specify the durability time and the number of times of durability of the test object W with high accuracy.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and there are design changes and the like within a range that does not deviate from the gist of the present invention. Also, they are included in the present invention.

1 ... Case, 1A, 1B ... Half case, 1a ... Hinge, 2 ... Cylindrical body, 2a ... Rotation axis, 2b ... Opening, 3 ... Slide mechanism (air cylinder unit), 3a ... Piston, 3b ... Cylinder, 3c ... Overhanging air tube, 3d ... Retracting air tube, 3e ... Jig, 4 ... Scooping member, 5 ... Control unit, 6 ... Sensor, 7 ... Sensor shading plate, 7a, 7b ... Piece, 10 ... Durability test device , G ... annular gap, W ... test object (elastic member), S ... scooping material

Claims (5)

It is a durability test device for the test piece,
A cylinder with a center of rotation and
A case that accommodates the cylindrical body and has an annular gap between the cylindrical body and the outer peripheral surface of the cylindrical body.
An actuator that rotates the cylinder around the center of rotation,
A slide mechanism arranged inside the cylinder and
A scooping member that enters and exits the annular gap through an opening formed in the cylinder by the slide mechanism.
A control unit for executing and controlling the protrusion of the scooping member into the annular gap and the pulling into the cylindrical body by the slide mechanism is provided.
One end of the test object is attached to a part of the inner surface of the case facing the annular gap , and the test body projects into the annular gap in a cantilevered state .
The control unit projects the scooping member into the annular gap on the downstream side of the test piece in the rotation direction of the cylinder, scoops the scooping material below the annular gap, and scoops the scooping material. A durability test apparatus in which control is performed in which the scooping member is pulled into the cylindrical body on the upstream side of the test object in the direction of rotation of the cylindrical body by free-falling and colliding with the test object. A sensor is attached to a predetermined position of the durability test device.
When the scooping member is detected by the sensor, a detection signal is transmitted to the control unit, and the control unit that receives the detection signal projects the scooping member into the annular gap with respect to the slide mechanism. The durability test apparatus according to claim 1, wherein a command signal for executing the pulling into the cylindrical body is transmitted. It said test object, of the inner surface of the case, the durability test apparatus according to claim 1 or 2 is mounted et the intersection of the horizontal line passing through the rotation axis of the cylindrical body. The durability test apparatus according to any one of claims 1 to 3, wherein the case is transparent or translucent so that the inside can be visually recognized. The case has a half-split structure, and two half-split cases can be opened and closed via hinges so that one of the half-split cases is opened so that the scooping material is accommodated in the annular gap. The durability test apparatus according to any one of claims 1 to 4.

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