JP6622744B2 - Tension meter - Google Patents

Description

  The present invention relates to a tensiometer that measures the tension of a belt in a stretched state.

  For example, a large blower or the like includes a so-called transmission device in which a belt is stretched between a pulley on the motor side and a pulley on the blower side, and the power of the motor is transmitted to the blower. Since the tension of the belt is related to the performance of the blower, it is necessary to measure the tension as needed and perform maintenance such as belt replacement as necessary. As a tensiometer for measuring the tension of the belt in the stretched state, one that measures a reaction force pressed from above on the outer peripheral surface of the belt is generally used. For example, a tensiometer described in Patent Document 1 is provided with a deformable body in which a hook-shaped contact bar pressed against a belt in a stretched state and a support bar provided with a grip handle on the top are elastically deformable. The strain detecting means is attached to the strain generating body. According to this, the resistance value detected by the strain detecting means changes according to the deformation amount of the strain generating body that is deformed by the reaction force pressed against the belt, and based on the resistance value with respect to a predetermined belt pushing allowance, The tension can be measured.

JP 2010-127841 A (4th page, FIG. 3)

  However, in such a tensiometer that measures the reaction force pressed against the outer peripheral surface of the belt from above, the tip of the contact rod is positioned at the center in the width direction of the outer peripheral surface of the belt. If the force cannot be applied accurately in the vertical direction, the tip of the contact rod slides on the outer peripheral surface of the belt, and there is a problem that accurate tension cannot be measured. In particular, in Patent Document 1, since the tip of the contact rod is formed in a hemispherical shape, the tip of the contact rod is easily slipped on the outer peripheral surface of the belt, and a detection device that detects a predetermined belt allowance is configured. Microswitches are provided on both the left and right sides of the contact rod. These microswitches must also be in contact with the center of the belt's outer circumferential surface in the vertical direction accurately and accurately measure tension. In order to do so, there is a problem that the skill level of the tensiometer user greatly affects.

  The present invention has been made paying attention to such problems, and an object thereof is to provide a tension meter that can accurately measure the tension of a stretched belt regardless of the level of skill of a user. And

In order to solve the above problems, the tensiometer of the present invention is:
A tensiometer that measures the tension of a belt stretched between a plurality of pulleys,
A fastener having a securing portion secured to the belt, and a gripper, the distortion detecting means is provided between these locking device and gripping device, the locking portion to the belt It is operated by being pulled and pulled toward the gripping tool side ,
A distance meter extends toward the opposite side of the gripping tool from the locking portion, and the distance meter is based on a straight line segment that is three-dimensionally parallel to either the inner or outer peripheral edge of the belt. as, can a straight line segment, the distance between the one of the inner peripheral edge or outer peripheral edge of the belt which is deformed in the measurement,
The strain detection means is capable of measuring a strain when one of the inner peripheral edge and the outer peripheral edge of the belt is separated from the straight line segment.
According to this feature, when a load is applied to the belt, the belt is locked by pulling a locking tool. Therefore, even when the belt width is small, regardless of the skill level of the tension meter user. A load can be reliably applied to the belt. Further, on the basis of a straight line segment that is three-dimensionally parallel to either the inner peripheral edge or the outer peripheral edge of the belt, the distance between the straight line segment and one of the deformed inner or outer peripheral edge of the belt It is possible to determine that the belt has been accurately pulled with a predetermined pulling margin.

The distance meter is formed by deforming the inner peripheral edge or the outer peripheral edge of another belt, which is stretched in parallel with the belt, between the plurality of pulleys on which the belt is stretched, as the straight line segment. It is characterized in that the distance between either the inner peripheral edge or the outer peripheral edge of the belt is measured.
According to this feature, the belt is pulled at a predetermined pulling distance by using either one of the inner peripheral edge or the outer peripheral edge of another belt stretched in parallel with the belt for measuring the tension as a straight line segment. This can be determined accurately and easily.

The locking device includes a flat surface that can be in contact with either the inner peripheral edge or the outer peripheral edge of the belt, and the distance meter includes a measurement surface that is parallel to the flat surface.
According to this feature, it can be accurately determined that the belt has been pulled at a predetermined pulling allowance.

An upright piece is fixed to the locking tool, a scale is provided on the upright piece, and a protruding piece having the measurement surface is attached to be movable in the extending direction of the upright piece. These upright pieces and the measurement surface constitute the distance meter.
According to this feature, since the distance meter is fixed to the locking device, the user can check the scale during the operation of pulling the belt with the locking device, and the belt can be accurately attached to the predetermined belt regardless of the skill level. It can be judged that it was drawn at the withdrawal allowance.

The gripping tool is characterized in that a weight portion is provided at a portion located vertically below the flat surface.
According to this feature, when the tension is measured, when the belt is pulled down, the weight portion can guide and correct the moving direction of the tension meter substantially downward in the vertical direction, and accurately measure the tension. Can do.

It is a figure which shows the tension meter in an Example. It is a perspective view which shows a transmission device. It is a figure which shows the aspect which measures the tension | tensile_strength in Example 1, (a) is a front view which shows the state which made the latching | locking part of the tension meter contact the outer peripheral surface of the belt of the front side, (b) Is a side view of the same. (A) is a front view showing a state in which the front side belt is deformed and the protruding piece of the distance meter is in contact with the rear side belt; (B) is also a side view. It is a front view which shows the state before pulling down a tension meter to a downward perpendicular direction. It is a front view which shows a mode that the latching | locking part of a tensiometer is made to contact | abut to the inner peripheral surface of the belt of the front side, and is pulled up upwards and a tension | tensile_strength is measured. It is a front view which shows a mode that the latching | locking part of a tension meter is made to contact | abut to the outer peripheral surface of the belt of the front side, and is pulled up diagonally upward, and a tension | tensile_strength is measured. It is a perspective view which shows the power transmission apparatus in Example 2. FIG. It is a figure which shows the aspect which measures the tension | tensile_strength in Example 2, (a) is a front view which shows the state by which the belt of the front side was deform | transformed and the protrusion of the distance meter contacted the string-like body, b) is also a side view.

  EMBODIMENT OF THE INVENTION The form for implementing the tension meter which concerns on this invention is demonstrated below based on an Example.

  A tensiometer according to Example 1 will be described with reference to FIGS.

  The tensiometer 1 measures the tension of a belt stretched between a plurality of pulleys in a transmission device, and in this embodiment, the tension belt 1 of a transmission device constituting a blower device used for ventilation or the like in a sewage treatment facility. It demonstrates as what measures tension | tensile_strength.

  As shown in FIG. 1, the tensiometer 1 mainly includes a locking tool 2, a gripping tool 3, a strain detection device 4 (strain detection means), and a distance meter 5. The locking tool 2 is an extension composed of a locking portion 6 formed by bending a metal plate member and a metal plate member connected to one end of the locking portion 6 by bolts 10, 10. Part 7. The extension portion 7 is connected to a strain detection device 4 described in detail later.

  The locking portion 6 includes a connecting portion 6a fixed to the extending portion 7, a bent portion 6b formed by being bent in a direction crossing the extending direction of the connecting portion 6a toward the opposite side of the extending portion 7, A first extending portion 6c that is bent from the portion 6b and extends in parallel with the extending direction of the connecting portion 6a, and is bent toward the extending portion 7 side at a substantially right angle with respect to the extending direction of the first extending portion 6c. The flat surface portion 6d (flat surface) and a second extending portion 6e that is bent from the flat surface portion 6d and extends in parallel with the first extending portion 6c are provided.

  The inner surface 60 of the flat surface portion 6d of the locking portion 6 functions as a contact surface with an outer peripheral surface 30a of the belt 30 described later, and the distance meter 5 is fixed to the second extending portion 6e. .

  The gripping tool 3 is connected mainly to a strain detection device 4 which will be described in detail later, and is mainly composed of a hook member 12 extending in the direction of the locking tool 2 and a weight part 13 fixed to the free end of the hook member 12. . The weight portion 13 is formed in a spherical shape with rubber or the like, and is easy for a user who wears gloves or the like to grip and to apply force.

  The strain detection device 4 includes a detector 14, an elastically deformable thick plate-like strain-generating body 15 in which a strain gauge 14 a that is a member constituting the detector 14 is attached to the center surface, and a locking tool 2. A first connecting member 16 and a second connecting member 17 formed by bending a metal plate connected to the extension portion 7 and the collar member 12 of the gripping tool 3 substantially at a right angle are provided. The detector 14 includes a strain gauge 14a, an arithmetic unit 14c connected by a strain gauge 14a and a wiring 14b. The arithmetic unit 14c has a liquid crystal display unit 14d. The extension portion 7 of the locking tool 2 and the first connecting member 16 are fixed by bolts 23.

  Further, the periphery of the strain body 15 is covered with a protective cover 18. The protective cover 18 has a surface portion 18a positioned on the gripping tool 3 side fixed to the flange member 12 of the gripping tool 3 by a fixing tool 19, and an extension portion 7 of the locking tool 2 is mounted on the surface portion 18b positioned on the locking tool 2 side. An opening 18c to be loosely inserted is provided.

  The strain body 15 and the first connecting member 16 are fastened and fixed by bolts and nuts 21 with washers 20 therebetween. The strain body 15 and the second connection member 17 are fastened and fixed by bolts and nuts 22 via two washers 20 and 20 therebetween, and the strain body 15 is directed in the direction of the first connection member 16. In comparison, the second connecting member 17 is easily deformed.

  When the strain generating body 15 is elastically deformed, the resistance value of the strain gauge 14a attached to the strain generating body 15 is changed. In the arithmetic device 14c, the compressive load based on the resistance value acquired by the strain gauge 14a is changed. The value is displayed on the display unit 14d. Since the strain gauge 14a is fixed to the surface of the strain-generating body 15 that is easily deformed on the second connecting member 17 side, the amount of change in the resistance value is relatively large, and the strain is easily detected.

  Thus, the locking tool 2 is connected to the gripping tool 3 via the first connecting member 16, the strain generating body 15, and the second connecting member 17, and the gripping tool is elastically deformed by the strain generating body 15. 3 can be swung relatively. The elastic deformation amount of the strain body 15 is very small, and the integrated strength of the tensiometer 1 is maintained high.

  When the inner surface 60 of the flat portion 6d of the latching tool 2 is pressed against the belt 30 in a stretched state while the gripping tool 3 is gripped, a compressive load applied in the extending direction of the locking tool 2 and the gripping tool 3 is applied. The strain body 15 is elastically deformed, and the resistance value of the strain gauge 14a attached to the strain body 15 is changed by the elastic deformation.

  The distance meter 5 includes an upright piece 24 fixed to the second extending portion 6e of the locking tool 2 with a bolt 25, and a loose fitting member 26 attached to be movable in the extending direction of the upright piece 24. I have. The standing piece 24 is made of a metal plate extending in parallel with the second extending portion 6e, and a scale 24a is provided on the surface of the locking member 2 that contacts the second extending portion 6e ( (See FIG. 3 (a)). The scale 24a can display the distance in the extending direction of the upright piece 24 between the flat surface portion 6d of the locking tool 2 that is a contact surface and the inner surface 28a of the protruding piece 28 that is a measurement surface.

  As shown in FIGS. 3A and 3B, the loosely fitting member 26 includes a base 27 having a hole 27a through which the upright piece 24 floats, and a side opposite to the surface on which the scale 24a is provided from the base 27. And the projecting piece 28 is formed in parallel with the extending direction of the flat portion 6d of the locking member 2. The inner surface 28 a of the projecting piece 28 functions as a measurement surface and is formed in parallel with the inner surface 60 of the flat portion 6 d of the locking tool 2 that functions as a contact surface with the belt 30. Further, a fixing bolt 29 is threaded through the loose fitting member 26, and the height of the fixing bolt 29 can be held by pressing the tip of the fixing bolt 29 against the standing piece 24.

  Next, a method for measuring the tension of the belt 30 using the tension meter 1 will be described with reference to FIGS. In the present embodiment, a case where tension is measured in a manner in which the outer peripheral surface 30a of the stretched belt 30 is pulled downward will be described as an example.

  As shown in FIG. 2, the transmission device T includes an electric motor M and a blower B. A pulley P1 and a pulley P2 are supported on the rotation shafts of the electric motor M and the blower B, and belts 30 and 31 are stretched around the pulleys P1 and P2. The belts 30 and 31 have the same shape, and are disposed in recessed grooves 40A and 41A and recessed grooves 41B and 41B provided in parallel on the front and rear sides of the pulleys P1 and P2, respectively. As shown in FIG. 3B, the belts 30 and 31 have a trapezoidal cross section, and the outer peripheral surfaces 30a and 31a and the inner peripheral surfaces 30b and 31b, which are parallel surfaces, are respectively outer peripheral surfaces. The outer peripheral edge is a side edge and the inner peripheral edge is an inner peripheral edge.

  In this embodiment, the height positions of the upper ends of the concave grooves 40A and 41A provided in the pulley P1 of the electric motor M of the transmission device T and the concave grooves 40B and 41B provided in the pulley P2 of the blower B are horizontal. Match. Therefore, the outer peripheral surface 30a of the belt 30 and the outer peripheral surface 31a of the belt 31 are stretched in parallel in the horizontal direction above the pulleys P1 and P2. Further, since the belt 30 and the belt 31 are provided in parallel in the front-rear direction, the outer peripheral surface 30a of the belt 30 and the outer peripheral surface 31a of the belt 31 are three-dimensionally parallel in the horizontal direction and the front-rear direction. It has become.

  First, the fixing bolt 29 of the distance meter 5 is loosened, and the inner surface 60 of the flat portion 6d of the locking device 2 that is the contact surface and the inner surface 28a of the projecting piece 28 that is the measurement surface are measured while checking the scale 24a. The position of the loose fitting member 26 of the distance meter 5 is adjusted so as to coincide with a predetermined dimension at which the belt 30 is sometimes pushed. After the position adjustment is completed, the fixing bolt 29 is tightened again to hold the protruding piece 28 against the standing piece 24.

  Subsequently, as shown in FIGS. 3A and 3B, the user holds the planar portion of the locking tool 2 in a state where the projecting piece 28 is held at a predetermined height position with respect to the standing piece 24. The inner surface 60 of 6d is brought into contact with the outer peripheral surface 30a of the belt 30 on the front side, the gripping tool 3 is gripped and the tension meter 1 is pulled down, and a load is applied to the belt 30.

  Since the protruding piece 28 of the distance meter 5 is disposed so as to protrude on the opposite side of the second extending portion 6e of the locking tool 2, the inner surface 60 of the flat surface portion 6d of the locking tool 2 is located on the front side. The belt 30 is positioned above the belt 31 on the rear side while being in contact with the outer peripheral surface 30 a of the belt 30. The user performs the operation of pulling down the tension meter 1 while confirming the positional relationship between the inner surface 28a of the projecting piece 28, which is the measurement surface, and the outer peripheral surface 31a of the belt 31.

  In the operation of pulling down the tension meter 1, as shown in FIGS. 4A and 4B, the inner surface 28a of the projecting piece 28 that is a measurement surface is in parallel with the outer peripheral surface 31a of the belt 31 on the rear side. When this is confirmed, the user can determine that the belt 30 has been pulled with a predetermined dimension. The user confirms the display on the display unit 14d (see FIG. 1) of the detector 14 at this time, and the numerical value (compression load value) displayed on the display unit 14d indicates that the performance of the belt 30 is good. The state of the belt 30 is determined by comparing with a predetermined range of tension that can be determined.

  In order to accurately measure the tension, the display portion 14d displays the inner surface 60 of the flat portion 6d of the locking tool 2 with a predetermined pulling margin in a direction orthogonal to the outer peripheral surface 30a of the belt 30. It is necessary to confirm the numerical value. As described above, in the present embodiment, the outer peripheral surface 30a of the belt 30 is stretched in the horizontal direction above the pulleys P1 and P2, so that the flat portion 6d of the locking member 2 is the outer peripheral surface 30a of the belt 30. The direction pulled orthogonally to the vertical direction is the downward vertical direction. As described above, since the outer peripheral surface 30a of the front belt 30 before deformation and the outer peripheral surface 31a of the rear belt 31 are parallel, the inner surface 28a of the projecting piece 28 is the outer peripheral surface of the rear belt 31. In the state of being in parallel contact with 31 a, the flat portion 6 d of the locking tool 2 is pulled down perpendicular to the outer peripheral surface 30 a of the belt 30.

  Thus, since the tension meter 1 pulls the belt 30 with the locking tool 2 locked, even if the width dimension of the belt 30 is small, the belt can be used regardless of the skill level of the user of the tension meter 1. A load can be reliably applied to 30. The distance between the straight line segment and the outer peripheral surface 30a of the deformed belt is defined based on the outer peripheral surface 31a of the rear belt 31 that is a straight line segment that is three-dimensionally parallel to the outer peripheral surface 30a of the belt 30. Since it can be measured by the distance meter 5, it can be accurately determined that the tension meter 1 has been pulled by the pulling amount of the predetermined belt 30 regardless of the skill level.

  As described above, the belt 30 and the belt 31 are provided on the pulley P1 and the pulley P2 in parallel in the front-rear direction, and in addition, the protrusion 60 of the distance meter 5 and the inner surface 60 of the flat portion 6d of the locking tool 2 are provided. Since the inner surface 28a of the piece 28 is parallel, the state in which the inner surface 28a of the projecting piece 28 is in contact with the outer peripheral surface 31a of the belt 31 on the rear side is such that the flat portion 6d of the locking tool 2 is the outer peripheral surface 30a of the belt 30. Therefore, the belt 30 can be pulled in an accurate direction regardless of the skill level.

  Further, as shown in FIGS. 1 and 5, the weight portion 13 of the gripping tool 3 is positioned vertically below the flat surface portion 6 d of the locking tool 2, so that the tension meter 1, in particular, the belt 30 is extended. The center of gravity balance with respect to the direction is adjusted so that the flat surface portion 6d of the locking tool 2 can be easily brought into contact with the outer peripheral surface 30a of the belt 30, and when the tension meter 1 is pulled downward, the moving direction is an accurate direction. It has a function of guiding and correcting downward in a substantially vertical direction.

  Further, since the distance meter 5 is fixed to the locking tool 2 and protrudes above the flat portion 6d, the user can visually recognize the scale 24a during the operation of locking the locking tool 2 and pulling the belt 30. It can be easily confirmed that the belt 30 is pulled by a predetermined pulling allowance.

  In addition, the flat portion 6d of the locking portion 6 is bent in the direction crossing the extending direction of the connecting portion 6a toward the opposite side of the extending portion 7, and in the extending direction of the bent portion 6b and the extending portion 7 formed in the extending direction. Since the positional relationship is partially overlapped, the deformation of the plane portion 6d due to the reaction force when the belt 30 is deformed is suppressed, and the extending direction of the bent portion 6b and the extension portion 7 is the inner surface of the plane portion 6d. It can be maintained in a direction orthogonal to 60, and accurate tension measurement can be performed.

  Further, as described above, the upright piece 24 that constitutes the distance meter 5 and has the scale 24 a is fixed by the bolt 25 in a state of being partially overlapped with the second extending portion 6 e of the locking tool 2. Therefore, even when the strain body 15 in the strain detection device 4 due to a reaction force when a load is applied to the belt 30 is elastically deformed, the inner surface 28a of the projecting piece 28 in the loose fitting member 26 held by the standing piece 24 The relative positional relationship in the height direction with the inner surface 60 of the flat portion 6d of the locking tool 2 does not change, and it can be accurately determined that the belt 30 has been pulled at a predetermined pulling margin.

  In the embodiment, the inner surface 60 of the flat surface portion 6d of the locking tool 2 is brought into contact with the outer peripheral surface 30a of the front belt 30, the gripping tool 3 is gripped, and the tension meter 1 is lowered. Although the description has been given of the aspect in which the load is applied to the annular belt 30 from the outer peripheral surface 30a toward the inside, the aspect in which the load is applied to the belt 30 is not limited thereto.

  For example, as shown in FIG. 6, the inner surface 60 of the flat portion 6d of the locking tool 2 is brought into contact with the inner peripheral surface 30b (inner peripheral edge) of the belt, the gripping tool 3 is gripped, and the tension meter 1 is pulled up. May be performed. When used in this manner, the tension meter 1 is pulled by a predetermined pulling amount of the belt 30 because the inner surface 28a of the protruding piece 28 of the distance meter 5 comes into contact with the inner peripheral surface 31b of the belt 31. Can be determined.

  As described above, the direction in which the grasping tool 3 is gripped and the tension meter 1 is pulled is a direction perpendicular to the outer peripheral surface 30a of the belt 30. For example, as shown in FIG. 7, the pulley P1 and the pulley P2 are stretched. When the tension is measured at a non-horizontal portion of the outer peripheral surface 30a of the belt 30 that is laid, the belt 30 is not vertically downward.

  Thus, either the outer peripheral surface 31a or the inner peripheral surface 31b of another belt 31 stretched in parallel with the belt 30 between the pulleys P1 and P2 on which the belt 30 is stretched is used as a reference. By measuring the distance between the corresponding outer peripheral surface 30a or the inner peripheral surface 30b of the belt 30 deformed by the load as a straight line segment, the tension meter 1 is only for the predetermined pulling amount of the belt 30. It can be judged that it was drawn.

  Note that the reference for the belt 30 deformed by the load for determining that the tension meter 1 is pulled by the pulling amount of the predetermined belt 30 using the distance meter 5 is parallel to the front and rear directions of the pulley P1 and the pulley P2. It is not limited to the belt 31 provided. Example 2 described below shows an example of a mode in which another belt provided in parallel to the belt for measuring the tension is not used as a reference.

  Next, a method of using the tensiometer 1 according to the second embodiment will be described with reference to FIGS. The description of the same configuration as that of the above embodiment is omitted.

  As shown in FIG. 8, one belt 300 is stretched between the pulley P <b> 1 ′ of the electric motor M of the transmission device T and the pulley P <b> 2 ′ of the blower B. When the tension of the belt 300 is measured by the tension meter 1, a string-like body 45 is bridged between the upper ends of the outer peripheral surfaces 40 and 41 of the pulleys P1 ′ and P2 ′, and a pulley P1 ′ is used by using a fixing means such as a tape. And the pulley P2 ′. And the outer edge 45a (refer FIG. 9) of the string-like body 45 is used as a straight line segment used as the reference | standard with respect to the outer peripheral surface 300a of the belt 300 deform | transformed with the load measured with the distance meter 5. FIG.

  Specifically, after the user adjusts the position of the inner surface 28a of the protrusion 28 of the distance meter 5 that is a measurement surface in the height direction, the inner surface 60 of the flat portion 6d of the locking tool 2 is connected to the outer peripheral surface 300a of the belt 300. The tension meter 1 is pulled downward in the vertical direction in a state of being in contact with the belt 300, and a load is applied to the belt 300. During the operation of pulling down the tension meter 1, it is used when it is confirmed that the inner surface 28 a of the projecting piece 28 that is a measurement surface has come into contact with the outer edge 45 a of the string-like body 45 as shown in FIG. 9. The person determines that the belt 300 is pushed in with a predetermined dimension.

  When adjusting the position in the height direction of the inner surface 28a of the projecting piece 28, which is the measurement surface, the height position between the outer peripheral surface 300a of the tension belt 300 and the outer edge 45a of the string 45 before applying a load. In consideration of the above, the inner surface 60 of the flat surface portion 6d of the locking device 2 serving as the contact surface and the inner surface 28a of the projecting piece 28 serving as the measurement surface are adjusted in this height direction to a predetermined dimension to which the belt 300 should be drawn when measuring the tension. It is assumed that the height position of the projecting piece 28 is adjusted so as to be a distance obtained by adding the distance.

  Furthermore, the straight line segment used as a reference for the outer peripheral surface 300a of the belt 300 deformed by the load measured by the distance meter 5 is not limited to the string-like body 45, and for example, between the pulley P1 ′ and the pulley P2 ′. A line segment parallel to the outer peripheral surface 300a of the tensioned belt 300 before being loaded with a laser pointer, ink, or the like is displayed on a standing plate or the like, and this line segment is visually observed from the horizontal direction. Then, it may be determined that the belt 300 is pushed in with a predetermined dimension based on a state in which the line segment and the inner surface 28a or the scale 24a of the projecting piece 28 of the distance meter 5 coincide with each other in the height direction.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  In the above-described embodiment, the distance meter 5 has been described as being fixed to the locking device 2. However, the present invention is not limited to this, and as described above, the elastic deformation amount of the strain body 15 in the strain detection device 4 is very small. For example, the distance meter 5 may be fixed to a member other than the locking tool 2 such as the gripping tool 3.

  Further, the strain measuring means is not limited to the configuration of the above-described embodiment. For example, the strain measuring means includes a scale and a spring, and the locking tool 2 and the gripping tool 3 resist the urging force of the spring by a reaction force when a load is applied to the belt. The belt tension may be measured by checking the distance separated by a scale.

  In the above-described embodiment, the strain detecting device 4 has the first connecting member 16, the strain generating body 15 and the second connecting member 17 as separate members. It may be configured. Further, the connection of each member constituting the tension meter 1 is not limited to bolts and nuts, and it goes without saying that any member may be used as long as it is firmly connected, such as welding.

DESCRIPTION OF SYMBOLS 1 Tension meter 2 Locking tool 3 Gripping tool 4 Strain detection device (strain detection means)
5 Distance meter 6 Locking part 6d Flat part (flat surface)
7 Extension part 12 Scissor member 13 Weight part 14 Detector 14 Detector 14d Display part 14a Strain gauge 15 Strain body 16, 17 Connection member 18 Protective cover 24 Standing piece 24a Scale 26 Free fitting member 27 Base 27a Hole 28 Projection piece 28a Projection piece inner surface 30, 31 Belt 30a, 31a Belt outer peripheral surface (outer peripheral edge)
30b, 31b Belt inner peripheral surface (inner peripheral edge)
45 String-shaped body 45a String-shaped body outer edge 60 Flat surface inner surface 300 Belt B Blower M Electric motors P1, P2 Pulley T Transmission device

Claims (5)

A tensiometer that measures the tension of a belt stretched between a plurality of pulleys,
A fastener having a securing portion secured to the belt, and a gripper, the distortion detecting means is provided between these locking device and gripping device, the locking portion to the belt It is operated by being pulled and pulled toward the gripping tool side ,
A distance meter extends toward the opposite side of the gripping tool from the locking portion, and the distance meter is based on a straight line segment that is three-dimensionally parallel to either the inner or outer peripheral edge of the belt. as, can a straight line segment, the distance between the one of the inner peripheral edge or outer peripheral edge of the belt which is deformed in the measurement,
The tensiometer according to claim 1, wherein the strain detecting means is capable of measuring a strain when any one of an inner peripheral edge or an outer peripheral edge of the belt is separated from the straight line segment.   The distance meter is formed by deforming the inner peripheral edge or the outer peripheral edge of another belt, which is stretched in parallel with the belt, between the plurality of pulleys on which the belt is stretched, as the straight line segment. The tensiometer according to claim 1, wherein a distance between one of the inner peripheral edge and the outer peripheral edge of the belt is measured.   The said locking tool is provided with the flat surface which can be interviewed in any one of the inner periphery or the outer periphery of the said belt, The said distance meter is provided with the measurement surface parallel to the said flat surface. Or the tension meter of 2.   An upright piece is fixed to the locking tool, a scale is provided on the upright piece, and a protruding piece having the measurement surface is attached to be movable in the extending direction of the upright piece. The tensiometer according to claim 3, wherein the standing piece and the measurement surface constitute the distance meter.   5. The tensiometer according to claim 3, wherein the gripping tool is provided with a weight portion in a portion located vertically below the flat surface.

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