JPS61120909A - Length measurement of section of long chain - Google Patents

Abstract

PURPOSE:To enable safe and accurate measurements of sections of a long chain, by installing a camera unit consisting of a pair of cameras and measuring mechanism, etc. CONSTITUTION:When measuring length of a sectional length of a continued chain 12 at the time of measurement of that 17, and a measuring mechanism Y is operated under the specified load on the No1. section continued chain 17 by a load applying mechanism X, front and rear end surface parts of each unit continued chain 12, 13... photographed by each camera 21, 22... are displayed on a monitor TV7 per each camera unit Q1, Q2.... At the center part of this slit-shaped image in the horizontal direction, the reference photographing point 21A of the No.1 camera 21 and that point 23A of the No.3 camera 23 are drawn in a cursor line manner and horizontal deviation l1 of the reference photographing point 21A and the front end surface 11A of the No. continued link 11A and horizontal deviation l2 of the photographing point 23A and the rear end surface 11ED of the No.5 continued link 11E can be confirmed. These deviations l1, l2 are introduced into a computer 8 and from l1, l2 and a distance L between the points 21A and 23A a sectional length L' of the No.1 unit continued chain 12 can be calculated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for measuring the segment length of a long chain such as an anchor chain formed by sequentially connecting a large number of chain rings.

(Prior art) Generally, a large long chain such as an anchor chain is wound up and unwound by a windlass having a claw member that engages with each chain ring constituting the chain. If this is not accurate, the chain ring and the claw member of the windlass will not mesh well, and in some cases, the two may not be able to mesh.

For this reason, when manufacturing such long chains, the chain ring pitch is strictly measured using the API method described below, and if the measured value exceeds the allowable dimensional error, it is discarded or corrected. .

The chain measurement method using the API method is to conceptually divide a chain into unit chains each consisting of a predetermined number of chain rings, and sequentially measure the length of each unit chain.
For example, in the 5-chain measurement method, which sequentially measures the length of a unit chain with 5 chains, each unit chain is mutually connected within the range of 1 to 3 chain rings of the preceding and following unit chains. (However, the L chain ring wrap part is not continuous)
The length of each unit chain is sequentially measured with a test load of % applied.

On the other hand, when measuring the length of a long chain for each unit chain using the API method, conventionally a test load is applied to a chain of a certain length that includes multiple sets of unit chains in succession,
In this state, two workers worked in pairs for each unit chain and successively measured the length directly using calipers. Bad, (b) There is a danger in the work because the worker performs the measurement work in a place with poor footing and in direct contact with the chain under tension. (C) The worker directly uses the caliper. Since the device is operated and the measured values are read, there are measurement errors and reading errors, making it difficult to obtain a high level of measurement accuracy.

(Objective of the Invention) The present invention aims to solve the problems pointed out in the above section of the prior art. The purpose of this paper is to propose a method for measuring segment lengths of shaku chains.

(Means for Achieving the Object) As a means for achieving the above-mentioned object, the present invention provides a long chain formed by sequentially connecting a large number of chain rings, and a plurality of unit chains each consisting of a predetermined number of chain rings. Sectional length of a long chain in which a part of each chain ring is lapped with each other and the length of each unit chain is measured while a predetermined load is applied to the long chain. In the measuring method, for each unit chain, a pair of cameras including a first camera that photographs an index site of a chain ring on one end side of the unit chain and a second camera that photographs an index site of a chain ring on the other end side of the unit chain; The first camera and the second camera are arranged in the longitudinal direction of the long chain, and the distance between the two reference photographing points is set to a constant dimension, and the reference photographing point is a mutual distance, a longitudinal deviation between the reference photographing point of the first camera and the index portion of the chain corresponding to the first camera, and the second
The actual length of each unit chain is measured by calculating the three deviations in the length direction between the standard photographing point of the camera and the t1 mark point of the chain ring corresponding to the second camera. be.

(Function) According to the present invention, since the measurement work is performed by optical means and electrical means, work efficiency is better than measurement work performed by human means, and work safety is ensured. In addition, the effect that measurement errors and reading errors are small and measurement accuracy is greatly improved can be obtained.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows a nostem diagram of a measuring device Z used for measuring the length of a long chain carried out by the method of the embodiment of the invention. This dimension measuring device Z follows the API measurement rules and measures the length of a long chain l by measuring the segment length of each unit chain consisting of five chain rings connected in sequence. Yes, the long chain 1
A load-loading mechanism X that applies a predetermined load (test load equivalent to 10% of the rated load) to It has Y.

The load loading mechanism X includes a pair of chucks 3 and 4 that are arranged facing each other with an appropriate distance between them, and a hydraulic cylinder device (not shown) that applies a test load between the pair of chucks 3 and 4. , +3.15.17 or 19 depending on the diameter of the bar forming the chain ring between the pair of chucks 3 and 4.
It is constructed so that five chain rings are arranged. This embodiment is for the case where 15 chain rings are arranged between a pair of chucks 3.4, and a chain ring 10A (this is connected to the first gripping chain ring) located at an arbitrary position on the long chain 1. ) is gripped by one chuck 3, and the chain ring 10B located 17th from the first gripping chain lOA (this is referred to as the second gripping chain) is gripped by the other chuck 4. A total of 1 from the first chain ring 11A to the fifteenth chain ring 11P located between the pair of gripping chains lOA and IOB.
A long chain consisting of 5 chain rings! Part of the inside (this is the first
A test load is simultaneously applied to the partial chains 17). Further, this long chain 1 is intermittently chained by an appropriate conveyance device (not shown) to each strawberry whose measurement work has been completed by the measuring mechanism Y, in a length corresponding to the length of the chain consisting of 14 chain rings. It is transported in the longitudinal direction (in the direction of the arrow). That is, the partial chain to be measured in this measurement work, for example, the 11th partial chain located at the end of the first partial chain wi+7.
The chain ring 11P becomes the frontmost chain ring of the second partial chain I8 to be measured in the next measurement operation (in other words, the last chain ring of the preceding partial chain and the frontmost chain ring of the following partial chain). (the chains wrap around each other).

The measuring mechanism Y is arranged at a predetermined pitch on the side of the partial chain (for example, the first partial chain 17) arranged in the load-bearing section between the first and second chucks 3.4 of the load-bearing mechanism X. In other words, of the 15- chain rings constituting the first partial chain 17, the front end surface in the transport direction of the first chain ring 11A (hereinafter, this chain ring end surface is simply referred to as the front end surface) is First camera 21 arranged to be able to take pictures
, a second camera 22 arranged to be able to photograph the front end surface 11Ea portion of the fifth chain ring 11E, and a rear end surface of the fifth chain ring 11E in the transport direction (hereinafter, this chain ring end surface is simply referred to as the rear end surface). The third camera 23 is arranged to be able to photograph the 11El+ portion, the fourth camera 24 is arranged to be able to photograph the front end surface 1''Ha of the eighth chain ring 118, and the rear end surface 111b portion of the ninth chain ring 11I. A fifth camera 25 is arranged to be able to photograph the front end surface 11Ka of the eleventh chain ring 11, a sixth camera 26 is arranged to be able to photograph the front end surface 11Ka of the eleventh chain ring 11, and a rear end surface 11Lb portion of the twelfth chain ring 11L can be photographed. The seventh camera 27 placed
and an eighth camera 28 arranged to be able to photograph the rear end surface 11Pb of the fifteenth chain ring 11P.

Among these eight cameras 21, 22..., a pair of cameras successively separated by a predetermined interval constitute a camera unit for unit chain (5 chain ring) measurement. That is, the first camera 21 and the third camera 23 measure the segment length of the first unit chain 12, which is composed of a total of five chains from the first chain ring 11A to the twelfth chain ring 11L. The camera unit Q1 measures the section length of the second unit chain 13, which is composed of a total of five chains from the fifth chain ring 11E to the ninth @ ring Ill, using the second camera 22 and the fifth camera 25. The second camera unit Q, which is the fourth camera 24 and the seventh camera 27
The third camera unit Q, which measures the segment length of the third unit chain I4 consisting of a total of five chains from the eighth chain ring 11H to the 1211th ring 11L, is connected to the sixth camera 26 and the third unit chain Q. 8 camera 28 from the 1st I chain ring 11K to the 15th chain ring 1
Fourth unit chain 1 consisting of a total of 5 chain rings up to 1P
A fourth camera unit Q4 is configured to measure the segment length of 5. Therefore, in this example, the first unit chain 1
2 and the second unit chain 13, there is only the fifth chain ring 11E, and between the second unit chain 13 and the third unit chain w114, there are two chain rings, the eighth chain ring 118 and the ninth chain ring 11+. However, between the third unit chain 14 and the fourth unit chain 15, two chain rings, the eleventh chain ring 11 and the twelfth chain ring 11L, wrap respectively. In this embodiment, the first camera 2I, the second camera 22, the fourth camera 24, the sixth camera 2, and the first camera in the claims are
The third camera 23, the fifth camera 25, the seventh camera 27, and the eighth camera 2 correspond to the second camera in the claims.

Further, in the method of the present invention, each of the above camera units Q,...
Each unit chain l 2, corresponding to each of Q,...
13..., but in this example, the chain rings (l IA, l IE, I IH) located at the front end side of each unit chain 12.13... are measured.

11K) front end surface (l IAa, I IEa, l IH
a, I IKa) and the chain ring located on the rear end side (l lF
, l l l.

11L, 11P) rear end surface (I IFb, l l lb
, IILb, 11Pb) are used as index sites (corresponding to index sites in the claims) for measuring the section length of each unit chain.

At positions facing each of the cameras 21, 22, etc. across the long chain 1, there are light sources (illumination devices 11) 31, 32, 33, 34, 35, 3 for photographing, respectively.
6.37 is installed.

Further, in this embodiment, the distance between the reference photographing points of the pair of cameras constituting each camera unit is matched with the reference length of each unit chain.

In the figure, reference numeral 5 is a power supply device for the camera, 6 is an image-powered device, 7 is a monitor television for visually checking the shooting status of each camera, 8 is a computer for calculating measured values, and 9 is for printing measured data. It is a printer of.

Next, a method of measuring the segment length of each unit chain 12, 13, etc. of the long chain l using this length measurement vI position Z will be explained by taking the measurement of the first partial chain 17 as an example. In addition, a predetermined test load is applied to the first partial chain 17 by the heavy load mechanism X! ! (After applying 100% rated load, 10
% rated load) to operate measuring mechanism Y. When the measuring mechanism Y operates, the front end surface portion and rear end surface portion of each unit series Ill 2, 13, etc. photographed by each camera 21, 22,... It is displayed on monitor TV 7. That is, as shown in FIG. 2, the front end surface 11Aa portion of the first chain ring 11A located at the front end surface of the unit chain (here, the first unit chain 12 portion will be explained) 12 is captured by the first camera 21 and the rear end. The rear surface +1Eb portion of the 51st ring 11g located at the 51st ring 11g is photographed by the third camera 23, and each is displayed on the monitor television 7 as a slit-shaped image. A reference photographing point 21A of the first camera 2I and a reference photographing point 23A of the third camera 23 are drawn in the form of a cursor line in the horizontal center of this ribbed image, and the reference photographing point of the first camera 21 is drawn in the form of a cursor line. 2LA and the front end surface 11 of the first chain ring 11A
The horizontal direction (i.e., longitudinal direction) deviation 111 from Aa, the reference photographing point 23A of the third camera 23, and the fifth chain ring 11E.
The horizontal direction deviation a from the rear end surface 11Eb can be confirmed at a glance.

Furthermore, the deviation at both ends of this unit chain (11° (1
, is input to the computer 8, and this deviation 111°a,
and the distance between the reference shooting point 2LA of the first camera 21 and the reference shooting point 23A of the third camera 23, and the distance between the reference shooting point 2LA of the first camera 21 and the reference shooting point 23A of the third camera 23.
busy h1 However, if rLl or return is outside the interval, α1. (It is a negative sign respectively) is calculated,
The calculation results are displayed on the monitor television 7 and printed out by the printer 9.

Therefore, when measuring the section length, the worker can directly check the section length of each unit series @12゜13, etc. displayed on the monitor TV 7, and after the measurement work, the operator can check the printed data. By reading it, it is possible to easily check at a glance whether there is a unit chain that exceeds the allowable dimensional error. A chain ring portion whose dimensions are determined to exceed the allowable dimensional error range from the above-mentioned dimensional measurement results is removed from the long chain 1 and replaced with a chain ring of normal dimensions.

In the above example, the number of chain rings measured in one measurement operation (i.e., the number of chain rings constituting a partial chain) is 15, but this measured number of chain rings is determined by the API rules. The diameter of the chain is determined by the material diameter (nominal diameter) of the chain.
This is the case for chains from 3mm to 78+am.

(Effects of the Invention) As is clear from the above description, the method for measuring segment lengths of long chains of the present invention allows segment lengths of a plurality of unit chains to be measured simultaneously by optical means and electrical means. Compared to conventional dimension measuring equipment, in which workers work in pairs and directly use calipers to sequentially measure the section lengths of unit chains, the measurement speed is much faster. The work can be carried out safely and with good workability, and there is no measurement error or reading error, and the measurement accuracy is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a measuring device for carrying out the method of the embodiment of the present invention, and FIG. 2 is a diagram showing the state of measurement by the measuring device shown in FIG. 1...Long chain 3.4...Chafuku+1A, 118
... Chain ring 12.13 ... Unit chain 17.18
...Partial chain 21.22... ...Camera 31.32... ...Light north Q,,Q,...
・ ...Camera unit X ...Load loading mechanism Y ...Measurement mechanism

Claims (1)

[Claims] 1. A long chain (1) formed by sequentially connecting many chain rings,
Each chain ring (11A, 11
B...) is divided into sections in a mutually lapped state, and the length of each unit chain (12, 13...) is measured while a predetermined load is applied to the long chain (1). A method for measuring the segmented length of a long chain, in which the length of each unit chain (12, 13, . . .) is
A first camera (2
A camera unit (Q_1, Q_2, Q
_3...) to the first camera (21, 22, 2).
4, 26) and the second camera (23, 25, 27, 28)
are arranged in the longitudinal direction of the long chain with the distance between the two reference photographing points set to a constant dimension (L), and the distance between the reference photographing points (L) and the first camera ( 21, 22, 24, 26) and the lengthwise deviation (l_1) between the reference shooting point of the chain ring corresponding to the first camera (21, 22, 24, 26), and the second The length direction deviation (l_2) between the reference shooting point of the camera (23, 25, 27, 28) and the index part of the chain ring corresponding to the second camera (23, 25, 27, 28) is By calculating the actual length (L
′).