JPH1073522A - Portable brinell hardness meter for timber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable Brinell hardness meter, for timber, which is operated easily and whose reliability is high. SOLUTION: A main column 3 is erected and installed in the center of a transversely installed leg part 2 in which floor contact rollers 1 are installed in a faced state at the front and the rear, the base part of a pressure beam body 4 the other end of which is installed so as to be extended to the right is fixed and bonded to the upper end part of the main column 3, the base part of an indentation-load detecting beam body 5 is fixed and bonded to the main column 3 at the lower part of the pressure beam body 4, and the indentation-load detecting body 5 is installed side by side with the pressure beam body 4. Then, an indentation lever 7 in which an indentation steel ball 6 is attached and installed at the lower end is suspended and installed at the other end of the indentation-load detecting beam body 5, and an indentation-depth detecting mechanism (a) which detects that the indentation steel ball 6 is indented to the surface of timber at a prescribed indentation depth (h) when the other end of the indentation beam body 4 is pressed downward between the indentation-load detecting beam body 4 and the indentation lever 7. In addition, an indentation-load detecting means (b) which detects an indentation load P is installed at the indentation-load detecting beam body 6, and a computing and display mechanism (c) which automatically computes and displays the Brinell hardness on the surface of the timber on the basis of the indentation depth (h) and on the basis of an indentation load is attached and installed at an apparatus body (k).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable Brinell hardness tester for measuring the hardness of wood.

[0002]

2. Description of the Related Art Generally, the Brinell hardness H (kgf / mm ² ) is determined by the linear D (m
m) with a load P (kgf) applied to the steel ball with a load P (kgf), and the press-fit depth h (mm) of the steel ball is measured to obtain H = P / πDh (kgf / mm ² ) (1) Required.

[0003] In the test method of Japanese Industrial Standard JIS-Z-2101 wood, the direct system D is pressed into a steel ball of 10 mm up to h = 1 / π (mm) (about 0.32 mm), and the load P at that time is H = P / 10 (2) according to equation (1) is used to determine the hardness of the wood.

Conventionally, the hardness of wood is generally measured using a dedicated wood hardness tester or a universal material tester. However, a wood hardness tester uses 1 / π (mm) (about 0.32 mm). ) Of the press-fit depth h is read with a dial gauge, and the load P is obtained from the total weight. For a universal material testing machine, the press-fit depth h and the load P
Is read from the recording paper, and the load P
Was substituted to calculate the hardness.

[0005] As described above, the conventional wood hardness tester and the universal material tester have not only a large-scale structure but also a firmly installed base on a solid installation base. (Hereinafter, referred to as a specimen T) to the place where the testing machine was installed, and had to be measured.

[0006] In addition, in both testing machines, the size of the test specimen and the measurement position on the test specimen are limited due to the structure, and operations such as reading the load at a predetermined press-fitting depth are troublesome. In addition, there is a problem that a large-scale structure is expensive and not easily available.

[0007] In order to solve the above problems, the present invention has a vessel so that a pressed steel ball of a predetermined size can be artificially pushed into the surface of wood, and the pushed steel ball is inserted into the vessel at a predetermined position on the surface of the wood. The indentation depth detection mechanism that automatically detects the indentation at the indentation depth and the indentation load detection means that automatically detects the indentation load are provided. It is an object of the present invention to provide a portable Brinell hardness tester for wood which solves the above-mentioned drawbacks by providing a calculation display mechanism for automatically calculating and displaying the Brinell hardness of the wood.

[0008]

The gist of the present invention will be described with reference to the accompanying drawings.

A mobile phone for wood which displays the hardness of wood by automatically measuring and calculating the load required to artificially push a steel ball of a certain size into the surface of the wood to produce a dent of a certain size. This is a type Brinell hardness tester, in which a contact roller 1.1 is rotatably mounted on a protruding end of a front and a rear of a horizontal leg 2 so as to be rotatable. A main pillar 3 is erected at the vertex of a right isosceles triangle with the line connecting the centers of the floor rollers 1.1 at the base, and the other end is extended rightward at the upper end of the main pillar 3 The base of the pressed beam 4 is fixed to the main column 3 below the pressed beam 4, and the base of the pressed load detection beam 5 is fixed to the main column 3 below the pressed beam 4 so that the pressed load detection beam 5 is fixed. A pushing rod 7 having a pushing steel ball 6 attached to the lower end is vertically attached to the other end of the pushing load detecting beam 5 and is arranged side by side with the pushing beam 4.
A pushing depth detecting mechanism a for detecting that the pushing steel ball 6 has been pushed into the wood surface at a predetermined pushing depth h when the other end of the pushing beam 4 is artificially pressed downward between the pushing rods 7. And the indentation load detection beam 5 is provided with an indentation load detection means b for detecting the indentation load P, and the body k is calculated and displayed on the basis of the indentation depth h and the indentation load P on the Brinell hardness of the surface of the wood. The present invention relates to a portable Brinell hardness tester for wood, which is provided with a calculation display mechanism c.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings, which are examples of embodiments, showing the functions and effects.

The center of the lower surface of the push-in steel ball 6 provided at the lower end of the push-in rod 7 is brought into contact with the measuring point of the test piece T, and the contact rollers 1.1 in front of and behind the push-in steel ball 6 and the lateral leg 2 are arranged. After the body k is set on the surface of the wood by the above, when the other end of the pressing beam 4 is pressed downward by human power, the pressing force F causes the upper part of the main column 3 to be inclined toward the pushing rod 7 side, and this inclination causes A force for pressing the test piece T is applied to the pressing rod 7 provided at the other end of the push load detection beam 5, and the press-in steel ball 6 is pressed into the measurement surface of the test piece T.

At this time, the indentation load detecting beam 5 is
Is deflected toward the pressing beam 4 by the reaction force from the test body T, so that the indentation load P applied to the pressing steel ball 6 is detected by the indentation load detecting means b provided on the indentation load detecting beam 5.

At the same time, it is detected by the indentation depth detecting mechanism a that the indented steel ball 6 has been pushed into the surface of the test piece T at a predetermined indentation depth h.

The indentation load P when the indented steel ball 6 is pushed into the surface of the test piece T at a predetermined indentation depth h is calculated by an operation display mechanism c to calculate the Brinell hardness at the measurement point. , The Brinell hardness of wood can be measured very easily.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a preferred embodiment of the present invention, FIG. 2 is a front view of the embodiment excluding an operation display mechanism c, and FIG. FIG. 4 is a front view showing the operation state of the push-in depth detection mechanism a, FIG. 5 is a circuit configuration diagram showing an electronic circuit of a calculation unit of the calculation display mechanism c, and FIG. FIG. 3 is a circuit diagram illustrating a circuit of a power supply unit.

A mobile phone for wood which displays the hardness of wood by automatically measuring and calculating the load required for artificially pushing a steel ball of a certain size into the surface of the wood to form a dent of a certain size. This is a type Brinell hardness tester, in which a contact roller 1.1 is rotatably mounted on a protruding end of a front and a rear of a horizontal leg 2 so as to be rotatable. The main pillar 3 is erected at the vertex of the right triangle, which is the base connecting the center lines of the floor rollers 1.1,
A pressing beam 4 having the other end extending rightward at the upper end of the main pillar 3
And fix the base of the indentation load detecting beam 5 at a predetermined distance to the main column 3 below the pressing beam 4 and attach the indenting load detecting beam 5 to the pressing beam 4. A pushing rod 7 having a pushing steel ball 6 attached to the lower end is vertically provided at the other end of the pushing load detecting beam 5, and the pushing beam 4 is provided between the pushing load detecting beam 5 and the pushing rod 7. A push-in depth detection mechanism a that detects that the push-in steel ball 6 has been pushed into the wood surface at a predetermined push-in depth h when the other end of the push-in load is artificially pressed downward. A pushing load detecting means b for detecting the pushing load P is provided, and a body k is provided with a calculation display mechanism c for calculating and displaying the Brinell hardness of the surface of the wood from the pushing depth h and the pushing load P.

Rolling bearings are attached to the front and rear protruding ends of the horizontal leg 2 as floor contact rollers 1.1 so as to face each other, and the body k cooperates with the pushing steel ball 6 of the pushing rod 7 to cooperate with the rolling bearing. The bending of the indentation load detection beam 5 is made smooth while supporting it so as not to incline, and the indentation steel ball 6 is provided so as to be pushed into the specimen T smoothly.

When the main pillar 3 is erected at the apex of a right isosceles triangle having the bottom as a line connecting the centers of the front and rear floor contact rollers 1.1 as viewed from above the horizontal leg 2, and a push-in steel is provided. When the ball 6 is pushed in, the distance between the press-in steel ball 6 and the floor contact roller 1.1 is increased so that the deflection of the press-in load detection beam 5 and the press-in of the press-in steel ball 6 are made smooth. In the illustrated embodiment, a vertical rod 2 ′ is erected at the apex of a right isosceles triangle having a line connecting the center line of the floor contact rollers 1.1 via a horizontal rod to a horizontal leg 2. A hollow cylindrical main column 3 is fitted to the vertical rod 2 'so as to be slidable up and down, and the main column 3 is moved up and down so that the pushing rod 7 is adjusted so as to be perpendicular to the surface of the test piece T. Fasten with bolt type main column height adjusting bolt 9.

Although not shown in the drawings, the center portion of the horizontal leg 2 having the floor contact rollers 1.1 opposed to the front and rear projecting ends is formed into a crank arm shape rightward when viewed from above. However, a vertical rod 2 'may be provided at the center of the crank arm shape in the same manner as described above.

Further, the base of the isosceles triangular plate is fixed to the right side of the horizontal leg 2 when viewed from above, and a line connecting the center of the floor contact rollers 1.1 is formed on the top of the plate. Various designs can be made such that the vertical rod 2 'is erected at the vertex of the right isosceles triangle as the base.

The base of the indentation load detection beam 5 is placed on the upper surface of the main column 3, and the distance between the indentation load detection beam 5 and the indentation load detection beam 5 is placed on the upper surface of the indentation load detection beam 5. A hollow cylindrical spacer 10 for holding in an appropriate state is provided, and the base of the pressing beam 4 having the other end extending rightward is placed on the upper surface of the spacer 10. A bolt hole is drilled in the base of the beam 4, a female screw is screwed near the upper part of the inner diameter of the main column 3, and a fastening bolt 11 is inserted into the female screw from the upper surface of the base of the pressing beam 4. Screwed onto the main column 3
The indentation load detecting beams 5 are firmly fixed to the juxtaposed state via the spacers 10.

A push rod 7 having a push steel ball 6 attached to the lower end thereof is vertically provided at the other end of the push load detecting beam 5.

The push-in depth detecting mechanism a will be described.

The push rod 7 has a thin cylindrical sheath-like push depth detecting tube 12.
A flat thin plate spring 13 having a downwardly bent key portion on the right side is provided on the upper surface of the push load detecting beam 5 near the pushing rod 7, and the upper surface of the base of the thin plate spring 13 is slidably fitted. Short cylindrical washer 14 made of insulating material
And the base of the flat plate-shaped thick plate spring 15
A thin disk-shaped thin washer 16 also made of an insulating material is placed on the upper surface of the base of 15, and bolt holes are drilled in the bases of the thin plate spring 13 and the thick plate spring 15, respectively. 5
A female screw is screwed into the female screw portion, and a set screw 17 is inserted into the female screw portion from above the thin washer 16 and screwed in. The thin leaf spring 13, the thick washer 14, the thick leaf spring 15, the thin washer 16
The lower end of the bent key on the right side of the thin plate spring 13 is fixed to the upper portion of the press-fit depth detecting tube 12, and the press-fit depth detecting tube 12 is lowered by the elastic pressure downward of the thin plate spring 13. The floor is biased.

Contact points 18 and 18 'made of a good conductor are attached to the upper surface of the thin leaf spring 13 substantially on the axis of the pushing rod 7 and the lower surface of the thick leaf spring 15 at the facing position so as to face each other. At the other end of the body 5, a press-in depth adjusting bolt formed of an insulating material for adjusting the distance between the contacts 18 and 18 'to the distance when the press-in steel ball 6 is pressed into the wood surface at a predetermined press-in depth h. 19 is screwed in to constitute a push-in depth detection mechanism a.

Next, the pushing load detecting means b will be described.

Two strain gauges 21 are attached to the upper and lower surfaces of the indentation load detecting beam 5 near the main column 3 in opposition to form a Wheatstone bridge, and the indentation load P of the indented steel ball 6 on the specimen T is determined. It is configured to convert to an electric signal.

An arithmetic display mechanism c for calculating and displaying the Brinell hardness of the surface of the wood from the indentation depth h and the indentation load P of the indented steel ball 6 indented into the test body T will be described.

The load applied to the indentation steel ball 6 is converted into an electric signal by a strain gauge 21 attached to the indentation load detection beam 5,
The electric signal from the strain gauge 21 is amplified by a strain amplifier, and the input voltage value is converted by a VF converter to a frequency proportional to the input voltage value.

When the other end of the pressing beam 4 is artificially pressed downward and the contacts 18 of the thin leaf spring 13 and the thick leaf spring 15 are connected, the output of the NAND circuit changes from L to H, and this change is triggered. A pulse signal of 0.1 second is generated by a pulse generation circuit as a signal, and at the same time, the counter is reset to a counting state. The frequency obtained by the VF conversion circuit is counted, and the Brinell hardness is digitally displayed.
For the calibration of the hardness value, the gain of the distortion amplifier is adjusted so as to follow H = P / πDh (kgf / mm ² ).

Since the embodiment of the present invention is constructed as described above, the main column 3 is moved up and down so that the pushing rod 7 stands upright on the test body T, and is fixed by the main column height adjusting bolts 9. The gap between the contact 18 'attached to the thick leaf spring 15 and the contact 18 attached to the thin leaf spring 13 by screwing the depth adjusting bolt 19 is adjusted to a predetermined pushing depth h of the pushing steel ball 6 into the surface of the test piece T. Adjust so that Next, the center of the lower surface of the pressed steel ball 6 is brought into contact with the measuring point of the test piece T, and after the body k is set on the test piece T by the pressed steel ball 6 and the front and rear contact rollers 1.1, the pressing is performed. When the other end of the beam 4 is pressed downward by human power, the pressing force F is
Is tilted toward the pushing rod 7 side, and a force for pressing the specimen T is applied to the pushing rod 7 provided at the other end of the pushing load detecting beam 5 by this inclination, and the pushing steel ball is pressed onto the measurement surface of the specimen T. 6 is pushed with a pushing load P. At this time, the indentation load detecting beam 5 is bent toward the pressing beam 4 due to the reaction force of the indented steel ball 6 from the test body T, and the indentation load P applied to the indentation steel ball 6 is applied to the upper and lower surfaces of the indentation load detecting beam 5. The signal is converted into an electric signal by the strain gauge 21 as the indentation load detecting means b and is sent to the arithmetic and display mechanism c.

At this time, even if the indentation steel ball 6 is pushed into the surface of the specimen T by the inclination of the indentation load detecting beam 5, the lower end of the indentation depth detecting tube 12 contacts the surface of the specimen T as shown in FIG. The position of the contact 18 provided on the thin leaf spring 13 to maintain the state is immobile, but as the pushing steel ball 6 is pushed in, the thick leaf spring
When the contact 18 'attached to 15 gradually approaches the contact 18 and reaches a predetermined pushing depth h, the two are electrically connected to each other and an electric signal is sent to the arithmetic display mechanism c. An electric signal indicating that the indentation depth has reached h and an electric signal indicating the indentation load P at that time are calculated by the operation display mechanism c, and the Brinell hardness is digitally displayed on the operation display mechanism c.

When the diameter of the indented steel ball 6 is smaller than 10 mm, the hardness can be measured with a smaller pressing force, and at the same time, the pressing depth is 1 / π (about 0.32 mm), which is 2/2 times. If π (approximately 0.64 mm), it is considered that if the indentation depth is increased, even if the measurement surface of wood or wood having a large heterogeneous name is rough, the dispersion of measured values will be reduced. The diameter of the indented steel ball 6 is 3 mm, the indentation depth is 2 / π, and this value is substituted for H = P / πDh to obtain the Brinell hardness H = P / 6. Is provided so that the gain of the distortion amplifier included in the above is automatically converted into Brinell hardness and displayed on the display unit of the operation display mechanism c in a digital manner.

[0034]

Since the embodiment of the present invention is constructed as described above, the hardness tester can be made small and portable.
The size of the specimen to be measured and the measurement position on the specimen are no longer limited as in the conventional testing machine, simply press the pressed steel ball to the measuring point and press the other end of the pressing beam artificially downward. The Brinell hardness of the measurement point is immediately displayed by the indentation depth detection mechanism, indentation load detection means, and calculation display mechanism. Easy to handle, highly reliable, cheap and convenient portable Brinell for wood It becomes a hardness meter.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a front view of the embodiment excluding a calculation display mechanism.

FIG. 3 is a front view of a pressing depth detecting mechanism according to the embodiment.

FIG. 4 is a front view showing the operation of the pushing depth detecting mechanism of the embodiment.

FIG. 5 is a circuit configuration diagram showing an electronic circuit of a calculation unit of the calculation display mechanism of the embodiment.

FIG. 6 is a circuit diagram showing a circuit of a power supply unit of the operation display mechanism of the embodiment.

[Explanation of symbols]

 a Indentation depth detection mechanism b Indentation load detection means c Arithmetic display mechanism h Indentation depth k Body P Indentation load 1 Flooring roller 2 Lateral leg 3 Main pillar 4 Press beam 5 Push load detection beam 6 Push steel Ball 7 Push rod

Claims (1)

[Claims] 1. Wood that displays the hardness of wood by automatically measuring and calculating the load required to artificially push a steel ball of a certain size into the surface of the wood to produce a dent of a certain size. A portable Brinell hardness tester, in which a floor contact roller is rotatably mounted on front and rear protruding ends of a horizontal leg, and a front and rear contact roller as viewed from above the horizontal leg. The main column is erected at the vertex of the right isosceles triangle with the line connecting the centers of the bases at the bottom, and the base of the pressing beam body is extended at the upper end of the main column and the other end extends to the right. The base of the indentation load detecting beam is fixed to the main pillar below the pressing beam at a predetermined distance, and the indentation load detecting beam is juxtaposed to the indenting load detecting beam. At the other end of the body, a pushing rod with a pushing steel ball attached to the lower end is vertically installed, and when the other end of the pushing beam is pressed down artificially between the pushing load detecting beam and the pushing rod. The indentation depth detecting mechanism for detecting that the indented steel ball has been pushed into the wood surface at a predetermined indentation depth is provided, the indentation load detection means for detecting the indentation load is provided in the indentation load detection beam, and the body k A portable Brinell hardness meter for wood, further comprising a calculation display mechanism for calculating and displaying the Brinell hardness of the surface of the wood from the indentation depth and the indentation load.