Impact device

Abstract

To provide a means that allows a striking object to collide with a target object using a simple configuration. [Solution] The striking device 1 is used to strike an object with a striking object 5. The striking device 1 includes a guide member 2 for guiding the striking object 5 to the object, a striking object 5 provided inside the guide member 2 and having magnetism, and a holding member 3 that has magnetism and holds the striking object 5 and releases the holding of the striking object 5. The holding member 3 is movable between a holding position in which the magnetic force on the striking object 5 is large and a release position in which the magnetic force on the striking object 5 is smaller than that on the holding position.

Description

Technical Field

[0001] The present invention relates to a striking device for causing a striking object to collide with an object.

Background Art

[0002] For example, as one of the tests for examining the amount of impact energy absorbed by an object, there is a drop weight test. In the drop weight test for examining the amount of impact energy absorbed, for example, a weight is dropped onto a test piece, and the impact load, deformation amount, and buckling pattern acting on the test piece are examined. When conducting such a drop weight test and quantitative drop measurement, the following points should be noted in order to obtain accurate test and experimental results. (1) Making the initial velocity of the striking object, such as a weight, constant each time. (2) Making the resistance to the striking object during falling constant. (3) Preventing the striking object that has rebounded after colliding with the object from colliding with the object again.

[0003] As a conventional technique for making the initial velocity of the striking object constant, a large electromagnet may be used to hold the striking object. Also, when a permanent magnet is used, there is a mechanism for separating the dropped object held by the magnet by hitting it against another object. Even in this conventional technique, the device is very large. Patent Document 1 discloses a drop weight test device using an electromagnet and a permanent magnet.

Prior Art Documents

Patent Documents

[0004] [[ID= 33]]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As described above, the conventional technique has a problem that the device is large-scale.

[0006] The object of the present invention is to provide a means that can cause an object to collide with a target object using a simple configuration. [Means for solving the problem]

[0007] The striking device of the first invention is a striking device for impacting an object with a striking object, comprising: a guide member for guiding the striking object to the object; a striking object provided inside the guide member and having magnetism; and a holding member having magnetism for holding the striking object and releasing the holding of the striking object, wherein the holding member is movable between a holding position in which the magnetic force on the striking object is large and a release position in which the magnetic force on the striking object is smaller than that on the holding position.

[0008] In this invention, the striking device includes a holding member for holding the object to be struck and for releasing the object from being held. The holding member is movable between a holding position in which the magnetic field on the object is strong and a release position in which the magnetic field on the object is weaker than that of the holding position. Therefore, the object to be struck can be made to collide with an object with a simple configuration in which the holding member can move between the holding position and the release position.

[0009] The striking device of the second invention is characterized in that, in the striking device of the first invention, the guide member has a shape that guides the striking object to the target object in accordance with gravity.

[0010] The striking device of the third invention is characterized in that, in the striking device of the first invention, the holding member is positioned such that, when in the release position, the striking object is guided to the target object by the guide member in accordance with gravity.

[0011] The striking device of the fourth invention is characterized in that, in the striking device of the first invention, the magnetic force exerted by the holding member on the object to be struck in the holding position is a magnetic force capable of holding the object to be struck, and the magnetic force exerted by the holding member on the object to be struck in the release position is a magnetic force capable of not holding the object to be struck.

[0012] The fifth invention is a striking device that, in addition to the striking device of the first invention, further comprises an auxiliary member having magnetism and assisting in the holding of the object to be struck by the holding member.

[0013] The striking device of the sixth invention is characterized in that, in the striking device of the fifth invention, the auxiliary member is provided at a position within the guide member that is capable of contacting the object being struck.

[0014] The seventh invention is a striking device of the fifth invention, characterized in that the magnetic force applied to the object being struck by the auxiliary member is a magnetic force that is incapable of holding the object being struck.

[0015] The striking device of the eighth invention is the striking device of the fifth invention, characterized in that the holding member applies magnetic force to the auxiliary member.

[0016] The striking device of the ninth invention is characterized in that, in the striking device of the fifth invention, the magnetic force exerted by the holding member on the auxiliary member in the holding position is greater than the magnetic force exerted by the holding member on the auxiliary member in the release position.

[0017] The striking device of the 10th invention is characterized in that, in the striking device of the 5th invention, the magnetic force of the auxiliary member is such that when the holding member is in the holding position, the auxiliary member is able to hold the object to be struck, and when the holding member is in the release position, the auxiliary member is unable to hold the object to be struck.

[0018] The striking device of the 11th invention is an striking device of the first invention, further comprising an auxiliary member having magnetism and assisting the holding member in holding the object to be struck, wherein the guide member is substantially cylindrical with a hollow interior, the auxiliary member is provided at one end of the guide member and is capable of contacting the object to be struck inside the guide member, the holding member is in contact with the auxiliary member and imparts a magnetic force to the auxiliary member and has a plurality of surfaces of different areas, the area of ​​the contact surface between the holding member and the auxiliary member in the holding position is larger than the area of ​​the contact surface between the holding member and the auxiliary member in the release position, the magnetic force exerted by the holding member on the auxiliary member in the holding position is larger than the magnetic force exerted by the holding member on the auxiliary member in the release position, the magnetic force of the auxiliary member is such that when the holding member is in the holding position the auxiliary member can hold the object to be struck, and the magnetic force of the auxiliary member is such that when the holding member is in the release position the auxiliary member cannot hold the object to be struck.

[0019] The striking device of the twelfth invention is characterized in that, in the striking device of the first invention, a magnetic member is provided between one end and the other end of the guide member.

[0020] The striking device of the 13th invention is characterized in that, in the striking device of the 12th invention, the magnetic force of the member is such that when the striking object passes the member before it collides with the target object, the magnetic force is such that it is not possible to hold the striking object, and when the striking object passes the member after it collides with the target object, the magnetic force is such that it is possible to hold the striking object.

[0021] In the present invention, a magnetic member is provided between one end and the other end of the guide member. And the magnetic force of the member is a magnetic force that cannot hold the striking object when the striking object passes through the member before colliding with the target object, and is a magnetic force that can hold the striking object when the striking object passes through the member after colliding with the target object. Thereby, after the striking object collides with the target object and rebounds and passes through the member, the striking object is held (adsorbed) by the member, so that the striking object colliding with the target object again (rebound) is prevented.

Effect of the Invention

[0022] According to the present invention, with a simple configuration, the striking object can be made to collide with the target object.

Brief Description of the Drawings

[0023] [Figure 1] It is a diagram showing a striking device according to an embodiment of the present invention. [Figure 2] It is a diagram showing a striking device according to an embodiment of the present invention. [Figure 3] It is a diagram showing simulation results according to the presence or absence of magnetic force enhancement by the holding member with respect to the auxiliary member. [Figure 4] It is a graph showing the magnetic flux density at the location indicated by the arrow in FIG. 3. [Figure 5] It is a diagram showing a modified example of the guide member [Figure 6] It is a diagram showing a modified example of the guide member. [Figure 7] It is a diagram showing the location where the rebound prevention member is provided. [Figure 8] It is a diagram showing the location where the rebound prevention member is provided.

Modes for Carrying Out the Invention

[0024] Embodiments of the present invention will be described below. Figures 1 and 2 show a striking device 1 according to an embodiment of the present invention. The striking device 1 is used to strike an object with a striking object 5. The object to which the striking object 5 is struck is, for example, a road. The striking device 1 is used to understand the characteristics of a road when detecting the movement of a moving body, such as a vehicle moving on a road, based on vibrations transmitted to the road from the moving body. That is, the characteristics of the road are understood by striking the road with the striking object 5. Note that the object to which the striking object 5 is struck is not limited to a road.

[0025] As shown in Figures 1 and 2, the striking device 1 includes a guide member 2, a holding member 3, an auxiliary member 4, a striking object 5, etc. The guide member 2 is for guiding the striking object 5 to the target object. The guide member 2 is, for example, a roughly cylindrical shape with a hollow interior. When the striking device 1 is installed on the target object (for example, a road), the direction of extension (longitudinal direction) of the guide member 2 coincides with the direction of gravity. A magnetic striking object 5 is provided inside the guide member 2. The striking object 5 is, for example, a roughly spherical shape made of metal.

[0026] The retaining member 3 is for holding the striking object 5 and for releasing the striking object 5. The retaining member 3 is provided at one end of the guide member 3 (the upper end in Figures 1 and 2). Specifically, the retaining member 3 is provided on the auxiliary member 4.

[0027] The holding member 3 is movable between a holding position for holding the striking object 5 and a release position for releasing the striking object 5. The position of the holding member 3 shown in Figure 1 is the holding position. The position of the holding member 3 shown in Figure 2 is the release position. The holding member 3 has an operating part 3a and a holding part 3b. The operating part 3a is the part for the user of the striking device 1 to operate the holding member 3, and is, for example, plate-shaped. The user can move the holding member 3 to the holding position and the release position using the operating part 3a. From the holding position shown in Figure 1, the user can move the holding member 3 to the release position by rotating the holding member 3 90 degrees counterclockwise using the operating part 3a. Also, from the release position shown in Figure 2, the user can move the holding member 3 to the holding position by rotating the holding member 90 degrees clockwise using the operating part 3a. The holding part 3b is for holding the striking object and is magnetic. The holding part 3b is made of, for example, a magnet. The holding portion 3b is, for example, roughly rectangular in shape. Therefore, the holding portion 3b has multiple surfaces with different areas.

[0028] The auxiliary member 4 is for assisting the holding member 3 in holding the striking object. The auxiliary member 4 is provided at one end of the guide member 3 (the upper end in Figures 1 and 2). The auxiliary member 4 is magnetic. The auxiliary member 4 can come into contact with the striking object 5 inside the guide member 2. The auxiliary member 4 has, for example, a substantially cylindrical body and a flange extending outward from the end of the body.

[0029] The holding member 3 is in contact with the auxiliary member 4 and imparts a magnetic force to the auxiliary member 4. In the holding position, the holding member 3 is in contact with the auxiliary member 4 with the surface having the largest area of ​​the holding member 3 (holding portion 3b). In the release position, the holding member 3 is in contact with the auxiliary member 4 with the surface having the smallest area of ​​the holding member 3 (holding portion 3b). That is, the area of ​​the contact surface of the holding member 3 with the auxiliary member 4 in the holding position is larger than the area of ​​the contact surface of the holding member 3 with the auxiliary member 4 in the release position. As a result, the magnetic force exerted by the holding member 3 on the auxiliary member 4 in the holding position is greater than the magnetic force exerted by the holding member 3 on the auxiliary member 4 in the release position.

[0030] Here, the magnetic force of the auxiliary member 4 is set so that it cannot hold (attract) the striking object 5 on its own. Furthermore, the magnetic force of the auxiliary member 4 is set so that it can hold the striking object 5 when the holding member 3 is in the holding position. Moreover, the magnetic force of the auxiliary member 4 is set so that it cannot hold the striking object 5 when the holding member 3 is in the release position. In other words, the magnetic force reinforcement by the holding member 3 (holding part 3b) enables the auxiliary member 4 to hold (attract) the striking object 5. When there is external magnetic force reinforcement from the holding member 3 to the auxiliary member 4, that is, when the holding member 3 is in the holding position, the auxiliary member 4 is in an attracted state where it can hold the striking object 5. When there is no external magnetic force reinforcement from the holding member 3 to the auxiliary member 4, that is, when the holding member 3 is in the release position, the auxiliary member 4 is in a released state where it cannot hold the striking object 5. In this way, it is possible to control the holding (attraction) of the striking object 5 by the presence or absence of external magnetic force from the holding member 3.

[0031] When the user of the impact device 1 uses the impact device 1 to understand the characteristics of the road, first, the user moves the holding member 3 to the holding position using the operating unit 3a, and the auxiliary member 4 attracts (holds) the impact object 5. Next, the user sets the impact device 1 at the desired position on the road. Next, the user moves the holding member 3 to the release position using the operating unit 3a. As a result, the auxiliary member 4 can no longer hold (attract) the impact object 5, so the impact object 5 separates from the auxiliary member 4 and falls due to gravity. The impact object 5 is then guided onto the road by the guide member 2 and collides with the road. The user then uses other devices to understand the characteristics of the road upon which the impact object 5 collides.

[0032] Figure 3 shows the simulation results with and without magnetic force enhancement by the holding member 3 on the auxiliary member 4. Figure 3(a) shows the simulation results with magnetic force enhancement, and Figure 3(b) shows the simulation results without magnetic force enhancement. As shown in the figure, the magnetic force is increased in the "magnetic force enhancement" case, confirming that the external magnetic force is influencing the attractive force of the auxiliary member 4.

[0033] Figure 4 is a graph showing the magnetic flux density at the location indicated by the arrow in Figure 3. The horizontal axis represents distance [mm], and the vertical axis represents magnetic flux density [T]. The graph indicated by the dashed arrow a shows the magnetic flux density at the location indicated by arrow A in Figure 3(a). The graph indicated by the dashed arrow b shows the magnetic flux density at the location indicated by arrow B in Figure 3(b). The magnetic flux density with magnetic enhancement (Figure 3(a)) is greater than the magnetic flux density without magnetic enhancement (Figure 3(b)).

[0034] Since the guide member 2 is substantially straight, when the striking device 1 is installed on an object (for example, a road), the extension direction (longitudinal direction) of the guide member 2 coincides with the direction of gravity. However, the guide member 2 is not limited to this; it is sufficient that the shape of the guide member 2 guides the striking object 5 to the object according to gravity when the striking device 1 is installed. For example, as shown in Figure 5, if the guide member 102 is substantially straight, the extension direction (longitudinal direction) of the guide member 102 does not need to be perpendicular to the direction of gravity when the striking device 1 is installed. Also, as shown in Figure 6, the guide member 102 only needs to have a portion that extends in the direction of gravity, and may also have a substantially curved portion.

[0035] In this embodiment, an auxiliary member 4 is provided, but the holding member 3 alone may be used to hold the striking object 5 and release it. In other words, the auxiliary member 4 may not be provided. In this case, the magnetic force exerted by the holding member 3 on the striking object 5 in the holding position is set to a magnetic force that can hold the striking object 5. Also, the magnetic force exerted by the holding member 3 on the striking object 5 in the release position is set to a magnetic force that cannot hold the striking object 5. For example, the strength of the magnetic force may differ depending on the size of the area facing the striking object 5 in the holding position and the release position, thereby enabling the holding member 3 to hold and release the striking object 5.

[0036] Furthermore, the holding member 3 only needs to be able to hold the striking object 5, or release it, via or without the auxiliary member 4. For example, the holding member 3 may hold or release the striking object 5 by changing the strength of the magnetic force applied to the striking object 5 depending on the distance from the striking object 5. Also, although the holding member 3 and the auxiliary member 4 are provided at one end of the guide member 3 (the upper end in Figures 1 and 2), they only need to be positioned so that when the holding member 3 is in the release position, the striking object 5 is guided to the target by gravity by the guide member 2. For example, the holding member 3 and the auxiliary member 4 may be provided at an intermediate portion in the longitudinal direction of the guide member 2.

[0037] Furthermore, the striking device 1 may be provided with a magnetic rebound prevention member between one end and the other end of the guide member 2. The rebound prevention member is provided, for example, at the location indicated by arrow X in Figures 7 and 8. The magnetic force of the rebound prevention member is set to be such that it cannot hold the striking object 5 when the striking object 5 passes the rebound prevention member before colliding with the target object. The magnetic force of the rebound prevention member is set to be such that it can hold the striking object 5 when the striking object 5 passes the rebound prevention member after colliding with the target object.

[0038] Therefore, when the holding member 3 releases the striking object 5, and the striking object 5 falls from the auxiliary member 4 and passes through the rebound prevention member, the striking object 5 is not held (adsorbed) by the rebound prevention member. Subsequently, as shown in Figure 7, when the striking object 5 collides with the target object, bounces back, and passes through the rebound prevention member, as shown in Figure 8, the striking object 4 is held (adsorbed) by the rebound prevention member.

[0039] The rebound prevention member may be provided as a separate component from the guide member 2, or a part of the guide member 2 may be magnetized, so that a part of the guide member 2 becomes the rebound prevention member.

[0040] As described above, in this embodiment, the striking device 1 includes a holding member 3 for holding the striking object 5 and for releasing the striking object 5. The holding member 3 is movable between a holding position in which the magnetic field on the striking object 5 is strong and a release position in which the magnetic field on the striking object 5 is weaker than that of the holding position. Therefore, the striking object 5 can be struck against an object with a simple configuration in which the holding member 3 can move between the holding position and the release position.

[0041] Furthermore, a magnetic rebound prevention member may be provided between one end and the other end of the guide member 2. In this case, the magnetic force of the rebound prevention member is set to be such that it cannot hold the striking object 5 when the striking object 5 passes the rebound prevention member before it collides with the target object, and to be such that it can hold the striking object 5 when the striking object 5 passes the rebound prevention member after it has collides with the target object. As a result, when the striking object 5 bounces back after colliding with the target object and passes through the rebound prevention member, the striking object 5 is held (attracted) by the rebound prevention member, thus preventing the striking object 5 from colliding with the target object again (rebounding).

[0042] Although embodiments of the present invention have been described above, the applicable forms of the present invention are not limited to those described above, and modifications can be made as appropriate without departing from the spirit of the invention. [Industrial applicability]

[0043] The present invention can be suitably used in a striking device for impacting an object with a striking object. [Explanation of Symbols]

[0044] 1. Striking device 2 Guide members 3. Retaining member 4. Auxiliary members 5. Striking objects

Claims

1. A striking device for impacting an object with a striking object, A guide member for guiding the striking object to the target object, The striking object, which is provided inside the guide member and has magnetism, It comprises a holding member that has magnetism and holds the striking object and releases the striking object, The aforementioned retaining member is A holding position in which the magnetic force on the striking object is large, A release position in which the magnetic force on the striking object is smaller than that of the holding position, A striking device characterized by being movable.

2. The striking device according to claim 1, characterized in that the guide member is shaped to guide the striking object to the target object in accordance with gravity.

3. The striking device according to claim 1, characterized in that the holding member is positioned such that, when in the release position, the striking object is guided to the target object by the guide member in accordance with gravity.

4. The magnetic force exerted by the holding member on the striking object at the holding position is a magnetic force capable of holding the striking object. The striking device according to claim 1, characterized in that the magnetic force applied to the striking object by the holding member at the release position is such that the striking object cannot be held.

5. The striking device according to claim 1, further comprising an auxiliary member having magnetism and assisting in the holding of the striking object by the holding member.

6. The striking device according to claim 5, characterized in that the auxiliary member is provided at a position within the guide member that can contact the object being struck.

7. The striking device according to claim 5, characterized in that the magnetic force applied to the striking object by the auxiliary member is such that the striking object cannot be held in place.

8. The striking device according to claim 5, characterized in that the holding member applies magnetic force to the auxiliary member.

9. The striking device according to claim 5, characterized in that the magnetic force exerted by the holding member on the auxiliary member in the holding position is greater than the magnetic force exerted by the holding member on the auxiliary member in the release position.

10. The magnetic force of the auxiliary member is such that the auxiliary member can hold the striking object when the holding member is in the holding position. The striking device according to claim 5, characterized in that the magnetic force of the auxiliary member is such that the auxiliary member cannot hold the striking object when the holding member is in the release position.

11. The holding member further comprises an auxiliary member having magnetism and assisting in the holding of the striking object, The guide member has a roughly cylindrical shape with a hollow interior. The auxiliary member is provided at one end of the guide member and is capable of contacting the striking object inside the guide member. The holding member is in contact with the auxiliary member, applies magnetic force to the auxiliary member, and has multiple surfaces of different areas. The area of ​​the contact surface between the retaining member and the auxiliary member in the retaining position is larger than the area of ​​the contact surface between the retaining member and the auxiliary member in the release position. The magnetic force exerted by the holding member on the auxiliary member in the holding position is greater than the magnetic force exerted by the holding member on the auxiliary member in the release position. The magnetic force of the auxiliary member is such that the auxiliary member can hold the striking object when the holding member is in the holding position. The striking device according to claim 1, characterized in that the magnetic force of the auxiliary member is such that the auxiliary member cannot hold the striking object when the holding member is in the release position.

12. The striking device according to claim 1, characterized in that a magnetic member is provided between one end and the other end of the guide member.

13. The magnetic force of the aforementioned member is When the striking object passes the member before colliding with the object, the magnetic force is such that it is impossible to hold the striking object. The striking device according to claim 12, characterized in that the magnetic force is capable of holding the striking object as it passes through the member after colliding with the target object.

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