JP3312326B2 - Method and apparatus for measuring elongation of link chain - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for measuring the amount of elongation of a link chain, and more particularly to a method of measuring the amount of elongation of a link chain provided in a loop section of a continuous production line in a steelworks. The present invention relates to an elongation measuring method and apparatus.

[0002]

2. Description of the Related Art A continuous production line for surface-treated steel sheets in a steel mill or the like generally has a basic configuration as shown in FIG. The steel plate 30 wound in a coil shape is unwound by a payoff reel 31, and the leading end is welded and connected to the end of the preceding steel plate by a welding machine 32. Steel sheet 3 fed out connected to the preceding steel sheet
0 is loop section 3 for loop control
After passing through No. 3, it is processed in the surface treatment section 34. Surface treated steel sheet 30 continues to be a similar loop section 3
After being cut into a predetermined length by the shear 36 after passing through 5, the coil is again wound into a coil shape by the tension reel 37 and carried out to the next step.

[0003] In order to improve the production efficiency and maintain the quality of such a continuous production line, it is necessary to continuously transport the steel sheet 30 at a predetermined speed in the surface treatment section 34. To this end, loop sections 33 and 35 that perform a loop control function are provided upstream and downstream of the surface treatment section 34 in order to cause the steel sheet 30 to stay or discharge.

The steel plate 30 in the loop section 33 is suspended by sewing between several fixed rolls 33a and a moving roll 33b attached to a looper carriage 33c that moves vertically. The steel plate 30 is stored in the loop section 33 when the looper carriage 33c is raised, and is discharged when the looper carriage 33c is lowered. Four link chains 33e are provided as components for raising and lowering the looper carriage 33c while keeping it horizontal.

[0005] A part of the link chain 33e is fixed to a looper cage 33c. The middle of the loop meshes with the upper and lower sprocket wheels 33d and 33f. When one sprocket wheel 33f is rotated forward and backward by the electric motor 33g, the looper carriage 3
3 goes up and down. The steel plate 30 is conveyed while being held horizontally by being hung by a moving roll 33b attached to a looper carriage 33c that moves up and down.

Therefore, the four link chains 33e
If any one of them is worn out and stretched, the looper carriage 33c cannot be held horizontally. As a result, the conveyed steel plate 30 meanders, causing unstable operation or equipment failure,
As a result, quality abnormalities such as ear breakage occur. For this reason, the maintenance technician measures the amount of elongation due to wear between the links of the link chain 33e using the time when the equipment is stopped, and checks the elongation state of the link chain 33e.

FIGS. 8 and 9 are enlarged views of the structure of the link chain 33e. The link chain 33e includes a pair of outer rings 40, a pair of inner links 41 arranged alternately with the outer links 40, a link pin 42 connecting the outer link 40 and the inner link 41, and a rotatable link pin 42. A roller 43 as an intermediate member is sequentially connected between the roller 10 that is supported by the shaft and further between the link pin 42 and the roller 10 or between the link pin 42 and the inner link 41.

The link chain 33e is always under tension, and the link pin 42 and the link pin fitting hole 44 of the outer link 42 on which the link pin 42 is fitted, the sleeve 43 and the sleeve 43 are fitted. A load is always applied between the sleeve fitting holes 45 of the inner link 41. Further, a rotational force is applied at a position where the sprocket wheels 33d and 33f mesh with each other.

For this reason, the link pin 42 and the sleeve 4
3, a link pin fitting hole 44, and a sleeve fitting hole 4
When 5 can g2 and the gap g1 worn, link chain 33e is as increased time use, come elongation by one link per g ₁ + g _2. If the degree of this elongation exceeds a certain value, the length of the four link chains 33e holding the looper carriage 33c will vary, making it impossible to hold the looper carriage 33c horizontally as a result, as described above. Operation becomes unstable.

FIGS. 10 and 11 show a state in which the extension amount of the conventional link chain 33 is measured. FIG.
At 0 and 11, 46 is the loop section 33, 35
A scaffold assembled on both sides of the vehicle and on which an inspector rides, 47 is a scale. The scaffold 46 is provided near the middle of the height of the link chain 33e. Although not shown, a column for supporting the scaffold 46, a manual remote switch of the electric motor 33g, and the like are also prepared in addition to the above.

Inspection is performed on the scaffold 4 as schematically shown in the figure.
An inspector rides on 6 and moves the looper carriage 33c up and down by manual switching of the electric motor 33g in each section having a length substantially corresponding to the scale 47. Then, in a stopped state, the scale 47 is applied to a certain range of links as shown in FIG . Inspection has been performed by a method in which an inspector visually checks whether the amount of elongation is within a predetermined standard.

[0012]

As described above, according to the conventional inspection method of the link chain 33e, after assembling the scaffold 46, the electric motor 33g is manually operated intermittently and the link chain 33e is inspected.
While the measurement position of e was being moved, the scale 47 was applied to check the position by visual measurement. Therefore, the measurement of the amount of elongation of the link chain 33e is not only inaccurate due to parallax, skill, and the like, but is also performed by installing the scaffolds 46 on both sides and performing manual inspection work, so that wasteful labor and time are wasted. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and is intended to easily and accurately measure an elongation state due to wear of each link of a link chain in a short time. It is an object of the present invention to realize a method and apparatus for measuring the amount of elongation of a link chain that can be performed.

[0014]

SUMMARY OF THE INVENTION The present invention, a pair of sprockets rotatably provided spaced predetermined intervals, phosphorus
A mounting process in which the chain is placed in the area where tension is applied.
When a moving step of relatively moving by engaging the pair of sprockets in a range is working tension of the link chain, the amount of deviation of mutual rotation angles of the pair of sprockets when moving in the moving step A link chain, comprising: a detection step of detecting the rotation angle; a calculation step of calculating the amount of extension of the link chain based on the amount of rotation angle deviation detected in the detection step; and a display step of displaying the amount of expansion calculated in the calculation step. The method of measuring the amount of elongation was adopted.

Further, according to the present invention, after being mounted in a rotatable manner at a fixed interval and placed in a range where the tension of the link chain is acting, the tension of the link chain acts.
A pair of sprockets that rotate in mesh with the range ,
A rotation angle shift amount detecting means for detecting a mutual rotation angle shift amount between a pair of sprockets, and a link for calculating a link chain elongation amount based on the rotation angle shift amount detected by the rotation angle shift amount detecting means. A link chain elongation measuring device includes a chain elongation calculating means and a link chain elongation displaying means for displaying the elongation calculated by the link chain elongating calculating means.

Further, the rotation angle deviation amount detection means includes a rotation angle detection means provided on each of the sprockets, and a rotation angle deviation amount calculation means for calculating the deviation amount detected by the rotation angle detection means. It constitutes a chain elongation measuring device. Further, the rotation angle deviation amount detecting means includes a rotation angle detection sensor installed on one of the sprockets for generating a number of pulses proportional to the rotation angle, and a rotation reference sensor installed on the pair of sprockets for detecting a rotation reference position. A link chain elongation measuring device comprising: a phase detecting unit; and a rotation angle shift amount calculating unit configured to calculate a rotation angle shift amount based on detection results of the rotation reference phase detecting unit and the rotation angle detection sensor. Things.

[0017]

When the device is mounted on the link chain, the reference sprocket wheel rotates following the chain roller, and the meshing teeth mesh with the rollers of the link chain, and at the same time, the sprocket on the measurement side having an integral structure separated by a predetermined distance. The wheel follows the chain and meshes with it to rotate. When there is no elongation in the meshing path corresponding to the measurement range of the sprocket wheel on the measurement side, the rotation phases of the pair of sprocket wheels are synchronized, and the two measurement point detection sensors detect marks simultaneously.

If the link chain of the path meshed with the sprocket wheel on the measurement side is extended, the rotation phases of the two are shifted, and the roller at the end of the measurement range is displaced to the plus side by the extended amount. Therefore, when the device is moved by the link chain, the sprocket wheel on the measurement side terminates when the reference sprocket wheel is engaged with the end roller and the mark is detected, and the sprocket wheel on the measuring side is further rotated by the extra angle corresponding to the elongation. It will mesh with the rollers. At this time, the mark on the measurement-side sprocket wheel reaches the measurement point, and the mark that arrived later is detected by the measurement-point detection sensor on the measurement side.

The number of pulses within the time difference when the mark is detected by the measurement point detection sensors on the reference side and the measurement side is counted by the rotation angle detection sensor. The counted number of pulses is output to the arithmetic circuit, and the amount of elongation within the measurement range is calculated using the correction formula. The calculated amount of elongation of the link chain is stored in a storage circuit, and then printed out to a printer to determine whether or not it is necessary to take a countermeasure such as replacement of the link chain.

[0020]

【Example】

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a basic configuration of a mechanism section of an embodiment of the present invention, and FIG. 2 is a block diagram of a processing section of the embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a connecting bar, and reference numerals 2 and 3 denote sprocket wheels on a reference side and a measurement side formed in a pair structure. Each of the pair of sprocket wheels 2 and 3 has a predetermined number of meshing teeth 2g and 3g corresponding to the shape of the link chain on the circumferential portion. Sprocket wheels 2, 3
Is rotatably mounted on the connecting bar 1 via the rotating shafts 2a and 3a at an interval L0 substantially corresponding to the measuring range in the vertical direction.

Reference numerals 4 and 5 denote measurement holes for marking, reference numeral 6 denotes an electric motor, and reference numeral 7 denotes a rotation pulse detection type rotation angle detection sensor.
The measurement holes 4 and 5 are provided in the axial direction on the same circumference of the sprocket wheels 2 and 3, and the motor 6 and the rotation angle detection sensor 7
Are connected to the rotating shafts 2a and 3a, respectively. Also,
Reference numerals 8 and 9 denote measurement point detection sensors using light, which are fixed to measurement points on a horizontal radius line so as to face the measurement holes 4 and 5.

Reference numeral 10 denotes a roller of the link chain 33e described above, which is denoted by the same reference numeral. The meshing teeth 2g and 3g of the sprocket wheels 2 and 3 sequentially mesh with the rollers 10 separated by an interval L0. .theta. is the displacement angle of the measurement side sprocket wheel 3, and corresponds to the extension .DELTA.L within the range of the interval L0 between the link chains 33e. The deviation angle θ of the measurement-side sprocket wheel 3 that rotates following the roller 10 is detected by the rotation angle detection sensor 7.

In the block diagram of FIG. 2, reference numeral 11 denotes a detection circuit, 12 denotes an arithmetic circuit, 13 denotes a correction formula, 14 denotes a storage circuit, and 15 denotes a printer. The detection circuit 11 detects the pulse numbers N1, N2,... Corresponding to the extension amount ΔL of the link chain 33e based on the rotational angle deviation amount θ detected by the basic mechanism M of FIG. The arithmetic circuit 12 uses the correction equation 13 experimentally obtained in advance to calculate the detection circuit 11.
Is calculated.

The link chain 3 calculated by the arithmetic circuit 12
The elongation amounts L1, L2,... Of 3e are stored in the storage circuit 14. Further, the elongation amounts L1, L2 stored in the storage circuit 14
Are printed out by the printer 15 if necessary. The correction equation 13 is represented by a linear expression (linear line) of the pulse number N as shown in the figure, and a is a proportional constant (inclination of the line) and b
Indicates the value of the vertical axis at the origin (specific elongation).

Next, the principle operation of the basic configuration shown in FIGS. 1 and 2 will be described. When the reference-side sprocket wheel 2 is rotated clockwise by an electric motor 6 rotating at a constant speed as shown by an arrow, the entire mechanism section M rises at a constant speed while the meshing teeth 2g of the reference-side sprocket wheel 2 sequentially mesh with the rollers 10. At this time, the freely rotating measuring sprocket wheel 3 is positioned at a distance L0 away from the roller 1
The rotation that is sequentially engaged with 0 and follows is started. When the link chain 33e along the path where the measuring sprocket wheel 3 has engaged does not extend, the measuring holes 4 and 5 coincide with each other in the same phase. Therefore, since the measurement point detection sensors 8 and 9 detect the measurement holes 4 and 5 on the reference side and the measurement side at the same time, there is no deviation in detection timing.

Now, when the link chain 33e extends by ΔL1 with respect to the interval L0, the roller 10 at the end of the measurement range that meshes with the meshing tooth 3g of the measurement side sprocket wheel 3 will be described.
Moves upward by .DELTA.L1 as shown by the broken line. For this reason, a phase shift occurs between the measurement holes 4 and 5, and when the measurement side sprocket wheel 3 is additionally rotated by the rotation angle θ1 corresponding to the extension amount ΔL1, the meshing teeth 3g of the measurement side sprocket wheel 3 are broken. Of the roller 10. Then, the reference side measurement point detection sensor 8
When the time t1 elapses after the detection, the measurement hole 5 reaches the opposite measurement point, and the measurement hole 5 is detected by the measurement-side measurement point detection sensor 9.

The reference side sprocket wheel 2 passes through the meshing path of the measurement side sprocket wheel 3 for one more time.
When rotated, the measurement point detection sensor 8 detects the measurement hole 4 that has reached the second detection position. Meanwhile, the sprocket wheel 3 on the measurement side that rotates while following the roller 10
, An angular acceleration corresponding to the rotation angle θ1 is applied. And
When there is no extension in the second meshing path of the sprocket wheel 3 on the measurement side, the measurement point detection sensors 8 and 9 detect the measurement holes 4 and 5 at the same time. On the other hand, ΔL
If there is an elongation of 2, the measurement side sprocket wheel 3 also has a delay of the rotation angle θ2 corresponding to the amount of expansion ΔL2. Then, similarly, when the time t2 elapses after the detection of the second measurement hole 4, the measurement hole 5 is detected.

The output waveforms of the rotation angle detection sensor 7 and the measurement point detection sensors 8 and 9 in this case are shown in the detection circuit 11 of FIG. Count number N of pulses within time t1, t2
1 and N2 are output to the arithmetic circuit 12, and the correction equation (L
= N × a + b), the elongation amounts L1 and L2 are calculated. The calculated elongations L1 and L2 of the link chain 33e are stored in the storage circuit 14 as described above. Then, using the L1 and L2 printed out on the printer 15 connected to the apparatus, the elongation ΔL of the link chain 33e is displayed on the chart as a numerical value.

FIGS. 3 to 5 show a specific structure of the mechanism section M of the apparatus according to the embodiment of the present invention. In the embodiment, as shown in FIG. 5, a case where the present invention is applied to a link chain 33e having a quadruple structure in which four chains are integrally combined is illustrated.

3 to 5, reference numeral 16 denotes a main body of the apparatus. The main body 16 includes a front plate 16a corresponding to the connecting bar 1,
It comprises a back plate 16b, a holding rod 16c for holding the back plate 16b with a certain gap, and a fixing screw 16d. The holding rod 16c and the fixing screw 16d are both provided at four positions on both side surfaces of the main body 16, and the back plate 16b is connected to be openable and closable by using both ends of each holding rod 16c as hinges (shown by broken lines). The components such as the sprocket wheel 2 described with reference to FIGS. 1 and 2 are again given the same reference numerals and are attached to the front plate 16a.

Reference numeral 17 denotes a case of the processing section S attached to the front plate 16a, 18 denotes a fixed guide on the back side of the front plate 16a, and 19 denotes a movable liner provided on the back plate 16b. An operation unit having a switch and a lamp and a display unit are provided on the front surface of the case 17 of the processing unit, and the processing unit S, a control circuit for controlling each component unit, and the like are accommodated therein. The fixed guide 18 and the movable liner 19 face each other and guide the two rows of rollers 10 to mesh with the sprocket wheels 2 and 3. In particular,
The movable liner 19 always presses the roller 10 toward the front plate 16a side by the spring 19a to make contact with the tooth bottoms of the meshing teeth 2g and 3g to reliably mesh.

In the case of the embodiment shown in FIGS.
Of the many links 40 and 41 connected one after another to form the link chain 33e, the extension amount ΔL is continuously measured every ten links. Therefore, the distance L0 between the pair of sprocket wheels 2 and 3 is set to a length corresponding to ten links. Each of the sprocket wheels 2 and 3 has ten engaging teeth 2g and 3g formed on the outer periphery thereof so that the sprocket wheels 2 and 3 measure the amount of extension L1, L2... Once per rotation.

Reference numerals 20 and 21 denote small chain wheels, and reference numeral 22 denotes a chain suspended by the chain wheels 20 and 21 (hereinafter, also refer to FIGS. 6 (a) and 6 (b)). Chain wheels 20 and 21 are fixed to rotating shafts 2a and 3a of sprocket wheels 2 and 3, respectively. 23
Are two arc grooves penetrating in the thickness direction of the chain wheel 21; 24 is a pin implanted in the sprocket wheel 3 and inserted into the arc groove 23;
Is a tension spring suspended at the tips of the pins 24 and 25.

The pulling force of the pulling spring 26 constantly applies a pulling force in the direction of rotation, and the link chain 33
The play generated between the roller 10 and the sprocket wheel 3 is not generated. In addition, reference numeral 27 denotes a storage box for accommodating the battery 27 as a power source, reference numeral 28 denotes a connection terminal of the printer 15, and reference numeral 29 denotes upper and lower limit sensors for controlling the vertical movement range of the self-propelled main body 16.

An example of the operation of the embodiment of FIGS. 3 to 6 having such a structure will be described below. The looper carriage 33c of the loop section 33 or 35 is lowered by the electric motor 33g and held at the lowest position by utilizing the suspension of the operation of the processing equipment (FIG. 7). Back plate 16b of main body 16 of mechanism section M
However, the main body 16 is attached to the vicinity of the lower end of the link chain 33e by opening / closing the holding rod 16c using the hinge as a hinge. Body 16
When the roller 10 is attached to the link chain 33e, as shown in FIG.
And the sprocket wheels 2 and 3 are 1
The roller 10 is engaged with the roller 10 which is separated by zero.

When the electric motor 6 is driven and the meshing teeth 2g1 of the sprocket wheel 2 start meshing in order from the lower roller 10, the meshing teeth 3g of the upper sprocket wheel 3 also mesh with the roller 10 following the meshing teeth 2g1. To start. At the same time, the main body 16 starts to move up along the link chain 33e. When the main body 16 is raised by the rotation force of the sprocket wheel 2 by the electric motor 6 and the sprocket wheel 2 makes one rotation, the roller 1 with the meshing teeth 2g separated by 10 sheets
With 0, the measurement hole 4 reaches the horizontal position.

At this time, light projected from the light emitting element on the opposite side of the measurement point detection sensor 8 passes through the measurement hole 4, and the transmitted light is received by the light receiving element, and the measurement hole 4 is detected. At this time, the meshing teeth 3g of the upper sprocket wheel 3 were also 10
The measurement point detection sensor 9 detects the measurement hole 5 that has meshed with the roller 10 on the sheet and has also reached near the horizontal. Link chain 33 of the first meshing path of sprocket wheel 3
If e has an extension, a time difference t1 occurs between the detection times of the measurement point detection sensors 8 and 9. The rotation angle detection sensor 7 counts the number of pulses N1 within the time t1 detected by the measurement point detection sensors 8 and 9 at this time.

The number of pulses N1 counted as described above is calculated and stored in the arithmetic circuit 12 by using the correction formula (L1 = N1 × a + b). Stored in circuit 14. Subsequently, the number of pulses N2 corresponding to the time difference t2 when the sprocket wheel 2 makes one more rotation is similarly calculated by the arithmetic circuit 1.
The elongation amount L2 in the second measurement range in which the sprocket wheel 3 is engaged is stored in the storage circuit 14. Thereafter, when the same measurement operation is performed and the main body 16 reaches the upper limit of the loop section 33 or 35, the looper carriage 33c is raised and the measurement of the extension L of the remaining portion of the link chain 33e is resumed. become.

During the movement of the main body 16, the rollers 10 are guided by the fixed guide 18 while being pressed by the movable liner 19, so that they are accurately meshed with the meshing teeth 2g and 3g. Further, since the chain wheels 20, 21 having the function of absorbing play (play) shown in FIG. 6 are provided alongside the sprocket wheels 2, 3, the extension amount L of the link chain 33e can be accurately detected. In this way,
When the inspection of one link chain 33e is completed, the device is removed, and the measurement of the extension amount L of another link chain 33e is performed by the same operation.

In the above embodiment, the case where the sprocket wheel is rotated has been described. However, it is also possible to move the link chain side while fixing the main body side. Good. In particular, if the phase difference is obtained directly from the angle measurement, the movement on the chain is unnecessary, and the measurement can be performed simply by placing the chain at an arbitrary position. Also, the case where one measurement hole has a measurement range of 10 links has been described, but the measurement hole and the measurement range can be appropriately increased or decreased. If you increase the number of measurement holes or decrease the number of target links,
A compact and lightweight measuring device can be realized. Further, although the transmission type measurement point detection sensor is shown and described in the drawings, it is also possible to use not only the reflection type but also a magnetic detector or an ultrasonic detector which detects marks by magnetism or ultrasonic waves.

[0041]

According to the present invention, a pair of sprockets rotatably provided at a predetermined interval are connected to each other by tensioning a link chain.
A mounting step of mounting in a range where force is acting,
A moving step of moving the sprocket relatively into engagement with a range in which the tension of the link chain is acting, and a detecting step of detecting a shift amount of a mutual rotation angle of the pair of sprockets when the sprocket is moved in the moving step. And a calculating step of calculating the amount of elongation of the link chain based on the amount of rotation angle deviation detected in the detecting step, and a display step of displaying the amount of elongation calculated in the calculating step, a method of measuring the amount of elongation of the link chain. It was adopted.

Further, according to the present invention, after being mounted in a rotatable manner at a fixed interval and placed in a range where the tension of the link chain is acting, the tension of the link chain acts.
A pair of sprockets that rotate in mesh with the range ,
A rotation angle shift amount detecting means for detecting a mutual rotation angle shift amount between a pair of sprockets, and a link for calculating a link chain elongation amount based on the rotation angle shift amount detected by the rotation angle shift amount detecting means. A link chain elongation measuring device comprising a chain elongation calculating means and a link chain elongation displaying means for displaying the elongation calculated by the link chain elongating calculating means.

Also, the rotation angle deviation amount detecting means includes a rotation angle detection means provided on each of the sprockets, and a rotation angle deviation amount calculating means for calculating the deviation amount detected by the rotation angle detection means. A chain elongation measuring device was constructed. Further, the rotation angle deviation amount detecting means includes a rotation angle detection sensor installed on one of the sprockets for generating a number of pulses proportional to the rotation angle, and a rotation reference sensor installed on the pair of sprockets for detecting a rotation reference position. A link chain elongation measuring device comprising: a phase detecting unit; and a rotation angle shift amount calculating unit configured to calculate a rotation angle shift amount based on detection results of the rotation reference phase detecting unit and the rotation angle detection sensor. .

As a result, unlike the conventional inspection method, there is no measurement error due to parallax, skill, or the like in measuring the amount of elongation.
In addition, since the inspection can be automatically performed without setting a scaffold, the inspection work can be easily performed without wasteful labor and time.

Thus, according to the present invention, it is possible to provide a method and an apparatus for measuring the amount of elongation of a link chain, which can measure the amount of wear and elongation of the link chain in a short time and with high accuracy.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a basic configuration of a mechanism section according to an embodiment of the present invention.

FIG. 2 is a block diagram of a processing unit according to the embodiment of the present invention.

FIG. 3 is a front view showing a configuration of an embodiment of the present invention.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a top view of FIG. 4;

FIG. 6 is an enlarged explanatory view of a portion A in FIG. 5;

FIG. 7 is a schematic diagram of a steel sheet processing facility to which the present invention is applied.

FIG. 8 is a sectional view of a link chain to which the present invention is applied.

FIG. 9 is an exploded perspective view showing a configuration of a link chain.

FIG. 10 is a schematic diagram showing a configuration of a conventional inspection system.

FIG. 11 is a schematic diagram showing a conventional measurement method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection bar 2, 3 Sprocket wheel 2a, 3a Rotating shaft 2g, 3g Meshing tooth 4, 5 Measurement hole 6 Electric motor 7 Rotation angle detection sensor 8, 9, Measurement point detection sensor 10 Roller 11 Detection circuit 12 Operation circuit 13 Correction formula 14 Storage Circuit 15 Printer 16 Main body 33e Link chain △ L, L1, L2 ... Elongation amount L0 Interval M Mechanical unit N1, N2 ... Number of pulses S Processing unit t1, t2 Time difference θ Shift angle

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Yamamoto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Michio Nishimori 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Inside Kokan Co., Ltd. (72) Ryoichi Kadota, Inventor Ryoichi Kadoka, Fukuyama City, Hiroshima Pref. Fukuyama Kyodo Co., Ltd. (56) References JP-A-56-117104 (JP, A) , U) Japanese Utility Model Application No. 1-14722 (JP, U) Japanese Utility Model Application Utility Model No. 3-109107 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01B 21/06 101 G01B 21/32

Claims (4)

(57) [Claims] 1. A pair of sprockets which are rotatably provided at a predetermined interval are operated by a tension of a link chain.
A step of placing the pair of sprockets in a range in which the pair of sprockets are engaged with each other in a range in which the tension of the link chain is acting; and A detecting step of detecting a mutual rotation angle shift amount of the sprocket; a calculating step of calculating the link chain elongation amount based on the rotation angle shift amount detected in the detecting step; And a display step of displaying the amount of elongation of the link chain. 2. After being mounted rotatably at a fixed interval and placed in a range where the tension of the link chain is working ,
A pair of sprockets that rotate while being engaged in a range in which the tension of the link chain is acting; a rotational angle deviation amount detecting means for detecting a mutual rotational angle deviation amount between the pair of sprockets; Link chain elongation calculating means for calculating the elongation of the link chain based on the amount of rotation angle deviation detected by the amount detecting means; and link chain elongation indicating the elongation calculated by the link chain elongation calculating means. An elongation measuring device for a link chain, comprising a display means. 3. The rotation angle deviation amount detection means includes: rotation angle detection means provided on each of the sprockets; and rotation angle deviation amount calculation means for calculating the deviation amount detected by the rotation angle detection means. 3. The apparatus for measuring the amount of elongation of a link chain according to claim 2, wherein: 4. A rotation angle detection sensor installed on one of the sprockets to generate a number of pulses proportional to the rotation angle, the rotation angle shift amount detection means, a rotation reference position installed on the pair of sprockets And a rotation angle shift amount calculating means for calculating a shift amount of the rotation angle based on detection results of the rotation reference phase detecting means and the rotation angle detection sensor. The link chain elongation measuring device according to claim 2, characterized in that: