JP4713074B2 - Measuring method of transmission chain slack - Google Patents

Description

  The present invention relates to a method for measuring the amount of slack in a transmission chain.

  Conventionally, there is an apparatus having a chain drive mechanism in which a transmission roller chain is wound around a drive sprocket and a driven sprocket. The roller chain of this chain driving mechanism is configured in an annular shape by alternately arranging a plurality of pin links and roller links, and inserting the pins of the pin links through bushes of the adjacent roller links to connect both links. . The roller chain is in an extended state as a whole because the sliding surface between the pin and the bush wears and play increases with use. If the chain stretch amount increases and the slack amount increases, the device may be damaged due to the occurrence of abnormal vibration. In order to prevent failure of the apparatus, generally, the amount of chain elongation is regularly measured and the amount of slack is quantitatively determined from the amount of elongation. In this case, when measuring the amount of elongation of the chain, first, the chain is removed from the sprocket and placed in a state of being pulled straight on a flat surface. Then, the length corresponding to the predetermined number of links is measured using calipers or the like and compared with the reference length to calculate the amount of chain elongation.

Further, as a technique for preventing a failure of a device due to an increase in the amount of chain elongation, for example, in Patent Document 1, a sensor for measuring the amount of chain slack is provided for each device. A device is disclosed in which the user is notified when the amount of slack is detected to exceed the allowable range by the sensor. In Patent Document 1, a chain tensioner is provided in a chain drive mechanism, and the sensor is configured to detect a displacement amount from an initial position of the chain tensioner. When the sensor detects that the amount of displacement of the chain tensioner is less than a predetermined value, the amount of slackness of the chain is within an allowable range, while the amount of displacement of the chain tensioner is greater than or equal to a predetermined value. Is detected, the amount of slack in the chain exceeds the allowable range.
JP-A-9-256865 (Page 4, FIGS. 9 to 11 and FIG. 13)

  However, when grasping the amount of slack due to chain elongation using the above general method, the amount of slack in the chain can be grasped quantitatively, but the chain must be removed from the sprocket and stretched straight. The work of measuring the chain elongation is complicated.

  Further, in Patent Document 1, the amount of slack caused by chain elongation is obtained using the sensor of the device. Therefore, a sensor must be provided for each device, and the structure of the device becomes complicated. Increase costs. In addition, since the notification is made when the amount of slack in the chain exceeds a predetermined value, the amount of slack is not known quantitatively, and the user cannot know the state of the chain in detail. Further, since the amount of slack in the chain is detected based on the amount of displacement of the chain tensioner provided in the chain drive mechanism, the technique of this Patent Document 1 is applied to an apparatus adopting a structure in which no chain tensioner is provided. Can not.

  The present invention has been made in view of such points, and the object of the present invention is to reduce the cost of the apparatus without providing a sensor for measuring the amount of slack in the chain for each apparatus, and to cause the chain elongation. An object of the present invention is to provide a method for measuring the amount of slack, which can easily and quantitatively measure the amount of slack to be obtained regardless of the structure of the chain drive mechanism.

To achieve the above object, the invention of claim 1, is respectively contact the opposite ends of the criteria component to the chain engaged with the drive sprocket and the driven sprocket, pressing the measurement site of the chain to orbit inwards, The dimension of the gap between the measurement site and the reference component was measured, and this measured value was taken as the amount of chain slack.

  Specifically, the present invention is directed to a method for measuring the amount of slack in a transmission chain that is wound around a drive sprocket and a driven sprocket and circulates in a predetermined track.

  Then, a steel ruler and a reference component member that extends substantially straight and constitutes a reference for measuring the amount of slack are prepared, and a substantially rectangular shape corresponding to the cross-sectional shape of the steel ruler is provided at the longitudinal center of the reference component member. A steel rule insertion hole having a cross section is formed so as to extend in a direction orthogonal to the longitudinal direction of the reference component, and both longitudinal ends of the reference component are connected to the drive sprocket and the driven sprocket of the chain. Abutting step of abutting the engaged portion from the outside of the track and extending the steel shank insertion hole so as to extend inward and outward of the track of the chain, and a longitudinal intermediate portion of the reference component member A pressing step in which the measuring part of the chain is pressed from the outer side of the raceway to the inner side by a steel ruler inserted through the steel ruler insertion hole from a direction substantially orthogonal to the direction in which the chain extends, and the loosening is eliminated. Te, the size of the gap between the measurement site and the reference component of the chain determined by inserted steel rule to the steel scale for through hole, a configuration in which the measured value and the amount of slack chain.

  According to this configuration, the position of the drive sprocket and the driven sprocket does not change regardless of the amount of slackness of the chain. Therefore, by bringing the reference constituent member into contact with the chain engaged with these sprockets, A standard for measuring the amount of slack is established. When the measurement part of the chain is pressed inward of the track, a gap is formed between the measurement part and the reference component, and the dimension of this gap is the amount of slackness of the chain.

  As a result, when measuring the amount of slack in the chain, it is not necessary to provide a sensor for measuring the amount of slack in each device, and the work of removing the chain from the sprocket and straightening it becomes unnecessary. Further, since the amount of slack in the chain is obtained based on the scale reading of the measuring tool, the user can quantitatively grasp the amount of slack in the chain. Furthermore, since it is possible to measure the amount of slackness of the chain using the reference component abutted against the chain, it is possible to measure the amount of slackness of the chain regardless of the structure of the chain drive mechanism.

  In addition, after the reference component member is brought into contact with the chain engaged with the driving sprocket and the driven sprocket, the measuring part of the chain is pressed by the measuring tool from the direction outside the track and substantially perpendicular to the extending direction of the chain in the pressing step. By eliminating the slack and measuring the size of the gap between the measurement site of the chain and the reference component, the gap between the reference component and the measurement site of the chain can be measured while the measurement site of the chain is held down by a steel ruler. Can be measured. For this reason, it becomes possible to continuously perform the step of pressing the measurement part of the chain and the step of measuring the dimension of the gap.

According to the present invention, constitutes a reference for the amount of slackness measuring by contacting the criteria component to the chain, the measurement site of the chain is displaced to the track inside of the reference component Since the dimension of the gap formed between them was measured and this measured value was used as the amount of slack in the chain, a sensor for measuring the amount of slack was not necessary, reducing the cost of the device and being related to the structure of the chain drive mechanism. The amount of slack in the chain can be measured easily. Furthermore, the user can quantitatively grasp the amount of slack in the chain and can know the state of the chain in detail.

  In addition, since the pressing step and the step of measuring the size of the gap between the reference component and the measuring part of the chain can be performed continuously by the steel ruler, the time required for measuring the amount of slack in the chain can be shortened. Can do.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view of a screw press device 1 to which a method for measuring a slackness of a transmission chain according to a reference example is viewed from the upstream side of a screw shaft 2. In the description of this reference example , first, a screw press device is described. The structure of 1 will be described. The screw press apparatus 1 is installed in a human waste treatment facility, and a screw shaft 2 arranged coaxially inside a taper drum (not shown) extending substantially horizontally rotates, and the taper drum is introduced from an introduction port 3. The processed product containing moisture is introduced to the upstream side of the nozzle, and the processed product is squeezed and dehydrated while being sent to the downstream side by the rotation of the screw shaft 2, and the dehydrated product is discharged from the downstream end of the taper drum to the outside. It has become.

  The screw press device 1 is fixed to a base 7, and a drive motor 8 for rotationally driving the screw shaft 2 is disposed on the right side (right side in FIG. 1) when viewed from the upstream side. The drive motor 8 is a well-known speed reducer integrated type, and is fixed to the motor fixing base 10 so that the rotating shaft 9 is substantially parallel to the screw shaft 2. A drive sprocket 12 having a relatively small diameter is attached to the rotary shaft 9 of the drive motor 8 in correspondence with the driven sprocket 11 attached to the upstream end of the screw shaft 2. As shown in FIG. 2, the driven sprocket 11 and the drive sprocket 12 are wound around a well-known transmission roller chain 17 having a ring shape by connecting a pin link 15 and a roller link 16. The sprocket 11, the drive sprocket 12 and the chain 17 constitute a chain drive mechanism 18. When the drive motor 8 is started, the chain 17 circulates while drawing a constant trajectory, whereby the power of the drive motor 8 is transmitted to the screw shaft 2.

  The motor fixing base 10 is disposed on the upper surface of the lower member 20 fixed to the right side surface of the base 7 and moves on the upper surface in a direction close to or away from the screw shaft 2. The drive motor 8 is attached to the upper surface of the movable member 21. A fixed plate 22 is erected on the right end of the upper surface of the lower member 20, and an adjustment bolt 23 for adjusting the tension of the chain 17 by moving the movable member 21 at the center of the fixed plate 22 is on the right side. Penetrating from left to right. A fixing nut 24 is screwed to the left side of the fixing plate 22 of the adjusting bolt 23, and the adjusting bolt 23 is fixed to the fixing plate 22. The front end side of the adjustment bolt 23 passes through the vertical plate portion 21a of the movable member 21 and protrudes to the left side of the vertical plate portion 21a. An adjustment nut 25 is screwed to the front end side of the adjustment bolt 23. . By tightening the adjustment nut 25, the movable member 21 slides on the upper surface of the lower member 20, the drive sprocket 12 moves away from the screw press device 1, and the chain 17 is stretched. On the other hand, by loosening the adjustment nut 25, the drive sprocket 12 moves in the direction approaching the screw press device 1 and the chain 17 is loosened.

  A chain cover 30 is attached to the screw press device 1. The chain cover 30 is divided into a screw press side member 31 and a motor side member 32 at a portion closer to the screw shaft 2 than the central portion of the rotation shaft 9 of the screw shaft 2 and the drive motor 8.

  A flange 31a is formed at the right end of the screw press side member 31 so as to extend outward from the chain cover 30 and extend substantially vertically. On the other hand, the motor side member 32 is formed so that the dimension in the vertical direction becomes shorter as it goes to the rotating shaft 9 side of the drive motor 8 in front view. At the left end portion of the motor side member 32, a flange 32a is formed to be joined to the flange 31a of the screw press side member 31. These flanges 31a, 32a are fastened by bolts and nuts (not shown). It has become. Further, the motor side member 32 is divided into an upper member 33 and a lower member 34 at a substantially central portion in the vertical direction. A flange 34a extending substantially horizontally toward the outside of the chain cover 30 is formed at the upper end portion of the lower member 34, and measurement for measuring slackness of the chain 17, which will be described later, is performed by the flange 34a. A measuring instrument installation unit for installing the instrument 40 is configured. Further, a flange (not shown) that joins the flange 34a of the lower member 34 is formed at the lower end of the upper member 33, and both the flanges 34a are fastened by bolts and nuts (not shown). It has come to be.

  Next, a method for measuring the slack amount of the chain 17 of the screw press device 1 configured as described above will be described. First, as shown in FIG. 1, the upper member 33 constituting the chain cover 30 is removed from the screw press device 1 to expose the upper part of the chain 17 wound around the driven sprocket 11 and the drive sprocket 12.

  Thereafter, the part for measuring the slack amount of the chain 17 is determined. Here, as shown in FIG. 2 (a), the distance between the axis P of the rotating shaft 9 of the drive motor 8 and the axis Q of the screw shaft 2 is measured in advance to determine the center position between the axes P, Q. R is obtained, and a separation distance X between the center position R and the flange 31a of the screw press side member 31 is calculated. And when determining the measurement site | part of the chain 17, conversely, the center position R is determined by calculating | requiring the site | part separated from the flange 31a of the screw press side member 31 by the said separation distance X. FIG. The pin 14 of the chain 17 in the vicinity of the center position R is marked with a chalk or the like as a measurement site. When determining the measurement site, a mark indicating the center position R may be provided in advance on the flange 34a of the lower member 34, and the pin 14 near the mark may be used as the measurement site. Further, for example, links 15 and 16 other than the pins 14 of the chain 17 may be used as the measurement site.

  Next, the measuring tool 40 is installed in the vicinity of the measurement site of the chain 17 on the upper surface of the flange 34 a of the lower member 34 constituting the chain cover 30. As shown in FIG. 3, the measuring tool 40 is made of a metal material such as stainless steel, for example, and has a rectangular base plate member 41 extending substantially horizontally, and a substantially central portion on the upper surface of the base plate member 41. And a prism member 42 standing substantially perpendicular to the upper surface. A steel ruler 43 (shown only in FIG. 3) cut slightly shorter than the prism member 42 is bonded to one side surface of the prism member 42 in a state in which the scale faces the longitudinal direction of the prism member 42. The scale of the measuring tool 40 is constituted by the steel scale 43. The scale of the measuring tool 40 may be configured by attaching a ruler or the like other than the steel ruler 43, or may be directly written on the prism member 42.

  After the measurement tool 40 is installed, as shown by an arrow A in FIG. 2B, a pressing process is performed to eliminate the slack of the chain 17 by pushing down the measurement site of the chain 17 inward of the track, that is, downward. Thereby, as indicated by a virtual line in FIG. 3, the measurement site of the chain 17 is displaced downward, and the scale of the measurement tool 40 corresponding to the measurement site of the chain 17 displaced downward is read. Thereafter, as shown by an arrow B in FIG. 2 (c), a pressing step is performed in which the measurement portion of the chain 17 is pushed out of the track, that is, upward, to eliminate the slack of the chain 17. Thereby, the measurement part of the chain 17 is displaced upward, and the scale of the measuring tool 40 corresponding to the measurement part of the chain 17 displaced upward is read.

  Thereafter, as shown in FIG. 3, the vertical displacement amount Y of the chain 17 is calculated from the scale reading value of the pressing step for depressing the measurement part of the chain 17 and the scale reading value of the pressing process for pushing up, This displacement amount Y is defined as the amount of slack in the chain 17. The two pressing steps for pressing the measurement part of the chain 17 inward and outward of the track are performed by pressing the measurement part inward of the track and then pressing the measurement part inward of the track. May be.

  After measuring the amount of slack of the chain 17 as described above, it is checked whether or not the measurement result is within an allowable range. If the measured result exceeds the allowable range, the movable member 21 is adjusted by the adjustment bolt 23 and the adjustment nut 25. To adjust the tension of the chain 17.

As described above, according to the method for measuring the slackness of the transmission chain according to this reference example , the measuring tool 40 is attached to the lower member 34 of the chain cover 30 with the chain 17 wound around the sprockets 11 and 12. After installing, the measurement part of the chain 17 is pushed down and the scale of the measuring tool 40 corresponding to the measurement part is read, and then the measurement part of the chain 17 is pushed up and the scale of the measuring tool 40 corresponding to the measurement part is read. Since the slack amount of the chain 17 is calculated from the readings of these scales, the operation of removing the chain 17 from the sprockets 11 and 12 and stretching it straight is unnecessary, and the measurement operation can be performed easily. Further, since the slack amount of the chain 17 is obtained based on the reading of the scale of the measuring tool 40, the user can quantitatively grasp the slack amount of the chain 17 and finely state the state of the chain 17. I can know. Further, since the measuring tool 40 can be used not only for the screw press device 1 but also for a device having a chain drive mechanism in general, a sensor for measuring the amount of looseness of the chain 17 is arranged in these devices as in the conventional example. Without installation, the amount of slack in the chain 17 can be measured, and the cost of the apparatus can be reduced. Further, the amount of slack in the chain 17 can be measured using the same measuring tool 40 between devices having different chain drive mechanism structures depending on, for example, the presence or absence of a chain tensioner.

  Further, since the measuring tool 40 is installed on the flange 34a of the lower member 34 constituting the chain cover 30, a support base for installing the measuring tool 40 may not be provided separately in the screw press device 1. . Thereby, the cost increase of the screw press apparatus 1 by providing the installation part of the measuring tool 40 can be suppressed. Furthermore, by installing the measuring tool 40 on the flange 34a of the lower member 34, the measurement site of the chain 17 and the measuring tool 40 can be brought close to each other. Thereby, the scale of the measuring tool 40 corresponding to the measurement part of the chain 17 can be read accurately, and the measurement error of the slack amount of the chain 17 can be reduced.

"Implementation-shaped state of the invention"
Figure 4 shows a rotary drum screen device 60 for applying a loosening amount measuring method of the transmission chain according to an exemplary shape condition of the present invention, firstly, the structure of the rotary drum screen device 60. The rotary drum screen device 60 is installed in a human waste treatment facility, and a cylindrical rotary screen (not shown) arranged coaxially inside a cylindrical main body cover 61 is arranged around its axis. It is configured to rotate.

  A driving shaft 62 that passes through the end surface of the main body cover 61 and protrudes outward is fixed to the rotating screen. A portion of the drive shaft 62 protruding from the main body cover 61 is rotatably supported by a pair of bearing members 64 fixed to the upper surface of the base 63. The driven sprocket 11 is attached to the outer end of the drive shaft 62.

On the side of the upper surface of the base 63 opposite to the main body cover 61, a speed reducer integrated drive motor 70 is attached via a motor fixing base 71. The drive motor 70 is disposed so as to face the end surface of the main body cover 61, and is positioned so that the rotation shaft 72 overlaps the drive shaft 62 when viewed from above and above the drive shaft 62. The drive sprocket 12 is attached to the rotating shaft 72 of the drive motor 70. The driven sprocket 11 and the drive sprocket 12 are wound with a transmission roller chain 17 similar to that of the above-described reference example , thereby forming a chain drive mechanism 18.

  The motor fixing base 71 is composed of a box-like lower member 75 fixed to the base 63 and a plate-like movable member 76 that is disposed on the upper surface of the lower member 75 and moves in the vertical direction. A drive motor 70 is attached to the movable member 76. An adjustment bolt 80 for adjusting the position of the movable member 76 is projected on the upper surface of the lower member 75, and an adjustment nut 81 is screwed to the adjustment bolt 80. The upper side of the adjustment bolt 80 above the adjustment nut 81 penetrates the movable member 76 and protrudes from the upper surface of the movable member 76. A fixing nut 82 for fixing the movable member 76 is screwed into a portion above the movable member 76 of the adjustment bolt 80. By tightening the fixed nut 82, the movable member 76 and the adjustment nut 82 are adjusted. 81. When the tension of the chain 17 is adjusted, first, the fixing nut 82 is loosened, and the adjusting nut 81 is rotated to move the movable member 76 upward or downward. It moves in a direction approaching the driven sprocket 11 or a direction away from the driven sprocket 11. Thereby, tension adjustment of the chain 17 is performed.

  Further, a chain cover 90 formed in a box shape is attached to the rotary drum screen device 60. The chain cover 90 is configured to be split at a predetermined location.

  Next, a method for measuring the amount of looseness of the chain 17 of the rotary drum screen device 60 configured as described above will be described.

  First, as shown in FIG. 5A, after the chain cover 90 is removed from the rotary drum screen device 60 to expose the chain 17, the shaft center P of the rotating shaft 72 of the drive motor 70 and the shaft of the drive shaft 62 are removed. The center position R between the shaft centers P and Q is obtained by measuring the distance from the center Q, and the pin 14 of the chain 17 in the vicinity of the center position R is used as a measurement site and marked with a choke or the like.

  Thereafter, an abutting step is performed in which a reference component 95 constituting a reference for measuring the amount of looseness of the chain 17 is brought into contact with the chain 17 from the outside of the track. The reference constituent member 95 is formed by molding a metal material such as stainless steel into an elongated rectangular column shape. The length of the reference component 95 is set longer than the distance between the centers of the driven sprocket 11 and the drive sprocket 12. A surface 95a on the chain 17 side of the reference component member 95 is formed in a flat surface, and the width of the surface 95a on the chain side is set to be slightly shorter than the distance between adjacent links in the width direction of the chain 17. As a result, both end sides in the longitudinal direction of the chain-side surface 95 a of the reference component member 95 abut on the roller outer surfaces of the portions of the chain 17 engaged with the driven sprocket 11 and the drive sprocket 12, respectively. At this time, since the positions of the driven sprocket 11 and the drive sprocket 12 do not change regardless of the slack amount of the chain 17, the slack amount is measured by the surface 95 a on the chain side by bringing the reference component member 95 into contact with the chain 17. Criteria for are configured. Since the reference component 95 is in contact with the outer surface of the roller, when the reference component 95 is moved in the width direction of the chain-side surface 95a, the reference component 95 is linked to the links on both sides of the chain 17 in the width direction. Contact with. Thereby, the reference component member 95 is prevented from falling off from the width direction of the chain 17.

  As shown in FIGS. 6 and 7, a steel shank 96 is inserted in the central portion of the reference component member 95 in the longitudinal direction in the track inner and outer direction, that is, in the direction substantially orthogonal to the direction in which the chain 17 extends. 97 is formed. The insertion hole 97 has a rectangular cross-section corresponding to the cross-sectional shape of the steel shank 96, and is configured by covering the open side of the groove 95 b formed in the reference component member 95 with a closing member 98. The closing member 98 is formed in a plate shape extending along the side surface of the reference component member 95, and both ends thereof are fastened to the reference component member 95 by screws 99. Further, the steel scale 96 abuts on the measurement site of the chain 17 whose end is opposed to the reference component 95.

After the reference component member 95 is brought into contact with the chain 17, as shown by an arrow C in FIG. 5B, when the steel rule 96 is pressed against the measurement site of the chain 17, the measurement site is displaced inward of the track. As a result, the slack of the chain 17 is eliminated, and the steel scale 96 protrudes from the reference component member 95 toward the chain 17 side. As a result, a gap 100 is formed between the chain-side surface 95a of the reference component 95 and the measurement site of the chain 17, as shown in FIG. Then, the scale Z of the steel scale 96 corresponding to the chain-side surface 95a of the reference component 95 is read to obtain the dimension Z of the gap 100, and the dimension Z of the gap 100 is defined as the amount of slackness of the chain 17. Thereafter, the tension of the chain 17 is adjusted as necessary as in the reference example .

  As described above, according to the method for measuring the slackness of the transmission chain according to this embodiment, the reference component member 95 is brought into contact with the chain 17 wound around the driven sprocket 11 and the drive sprocket 12, and the steel rule 96 is used. The measuring part of the chain 17 is pressed inward of the track, and the dimension Z of the gap 100 is measured by the steel rule 96 to determine the amount of slackness of the chain 17, so the chain 17 is removed from the sprockets 11 and 12 and straightened. The tensioning work is not necessary, and the measurement work can be easily performed. Further, since the slack amount of the chain 17 is based on the scale of the steel rule 96, the user can quantitatively grasp the slack amount of the chain 17 and can know the state of the chain 17 in detail. Further, since the reference component member 95 can be used not only for the rotary drum screen device 60 but also for a device having a chain drive mechanism in general, a sensor for measuring the amount of looseness of the chain 17 is disposed in these devices as in the conventional example. The cost of the apparatus can be reduced, and the amount of looseness of the chain 17 can be measured regardless of the structure of the chain drive mechanism.

  Further, since the measuring part of the chain 17 is pressed inward in the track by the steel rule 96, it is possible to continuously perform the pressing step of pressing the measuring part and the step of measuring the dimension Z of the gap 100. . As a result, the time required for measuring the slack amount of the chain 17 can be shortened.

  Note that the side surface of the reference component member 95 may be smoothed by grinding, for example, and the side surfaces may be used for positioning when the sprockets 11 and 12 are attached. That is, first, the side surface of the reference component 95 is applied to the side surface of the driven sprocket 11 on the main body cover 61 side and the side surface of the drive sprocket 12 on the counter drive motor 70 side. Then, the positions of both sprockets 11 and 12 are adjusted so that both side surfaces of the driven sprocket 11 and the drive sprocket 12 are in close contact with the side surface of the reference component 95. This makes it possible to check and adjust the positions of the sprockets 11 and 12 using the reference component member 95, thereby reducing the number of jigs used for assembly and inspection of the chain drive mechanism 18. It becomes.

Further, the reference may be used to measure the amount of looseness of the chain 17 of the rotary drum screen device 60 by using the slack amount measuring method of the chain according to the example, also loosening amount measuring method of the chain according to an exemplary shape state The slack amount of the chain 17 of the screw press device 1 may be measured using Furthermore, the slack amount measuring method of the chain before you facilities embodiment is not limited to a screw press apparatus 1 or a rotary drum screen device 60, it can be widely applied to a device having a chain drive mechanism.

  As described above, the method for measuring the amount of slack in a chain according to the present invention is suitable for measuring the amount of slack in an annular chain wound around, for example, a drive sprocket rotated by a drive motor and a driven sprocket. Yes.

It is a front view which shows the state which concerns on the reference example of this invention, and installed the measuring tool in the screw press apparatus. The chain drive mechanism of a screw press apparatus is shown enlarged, (a) is a figure of the state which installed the measuring tool, (b) is a figure of the state which pushed down the measurement site | part of the chain, (c) is a chain It is a figure of the state which pushed up the measurement site | part. It is a perspective view which expands and shows a measuring tool. The slack amount measuring method according to an exemplary shape condition of the present invention is a side view of a rotary drum screen device for measuring the amount of slackness of the chain. The chain drive mechanism of a rotary drum screen device is shown enlarged, (a) is a front view of a state in which a reference component is brought into contact with the chain, and (b) is a track inner portion of the chain measured by a steel ruler. It is a front view of the state pressed down. It is a figure which expands and shows the measurement site | part vicinity of the chain of FIG.5 (b). It is the figure which looked at the penetration hole neighborhood of a standard component member from the insertion side of a steel rule.

11 Drive sprocket 12 Drive sprocket 17 Chain 30 Chain cover 40 Measuring tool 34 Lower member 95 of chain cover Reference component 96 Steel ruler (measuring tool)

Claims (1)

A method for measuring the amount of slack in a transmission chain wound around a driving sprocket and a driven sprocket and circulating in a predetermined track,
Prepare a steel ruler and a reference component that constitutes a reference for measuring the amount of slackness extending substantially straight, and a substantially rectangular cross-section corresponding to the cross-sectional shape of the steel ruler is provided at the center in the longitudinal direction of the reference component. An steel hole insertion hole having a length extending in a direction perpendicular to the longitudinal direction of the reference component member,
Both ends in the longitudinal direction of the reference component are brought into contact with the portions engaged with the drive sprocket and the driven sprocket of the chain from the outer side of the track, and the steel rod insertion holes extend in the track inner and outer directions. The measuring portion of the chain facing the intermediate portion in the longitudinal direction of the reference component from the direction outside the track to the inside and substantially perpendicular to the direction in which the chain extends to the insertion hole for the steel ruler Through a pressing step that eliminates slack by pressing with the inserted steel ruler, the dimension of the gap between the measurement site of the chain and the reference component member is measured with the steel ruler inserted through the insertion hole for the steel ruler. A method for measuring the amount of slack in a transmission chain, wherein the measured value is the amount of slack in the chain.

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