JP6062204B2 - Conveyor and weighing device - Google Patents

Description

  The present invention relates to a transport conveyor and a weighing device including the same.

  As a conveyor, for example, as shown in Patent Document 1, a wide conveyor belt is wound around a driving pulley and a driven pulley formed in a roller shape, and both ends of the driven pulley are placed in front of the conveyor frame. Engage and support the support member provided in the upper part (conveyance upper), swing the left and right support members laterally outward to release them from the spindle, and the driven pulley can be removed. There is a configuration in which the distance between the driving pulley and the driven pulley can be narrowed by swinging up and down to greatly loosen the conveying belt.

JP 2010-37073 A

  In the above conventional structure, the driven pulley is adjusted in position forward and backward to adjust the tension of the conveyor belt. Because of this structure, it is necessary to adjust the tension of the conveyor belt by adjusting the position of the pressing member each time when the conveyor belt stretches with the progress of operation.

  Of course, as seen in many belt conveyors, if an automatic tension structure that slides and biases the support member that supports the support shaft of the driven pulley in the belt tension direction is introduced, frequent tension adjustment is not necessary. However, during cleaning and maintenance, it tends to be a structure that takes time and effort to remove the driven pulley from the support member that is urged by slide, and the urging force of the left and right springs may vary. .

  In addition, when the conveyor is a weighing conveyor that weighs while weighing the object to be weighed, and the loading conveyor is arranged to convey the object to be weighed, the final height of the loading conveyor and the starting height of the weighing conveyor If there is a difference between them, disturbance vibration due to climbing impact or drop impact will occur when objects to be weighed are transferred from the carry-in conveyor to the weighing conveyor, which will adversely affect weighing on the weighing conveyor. .

  The present invention has been made paying attention to such a situation, and the conveyor belt can be wound with a stable tension over a long period of time so that reliable and smooth conveyance can be performed, and maintenance can be performed. An object of the present invention is to provide a transport conveyor that is excellent and easy in height adjustment, and a weighing device including the transport conveyor.

  In order to achieve the above object, the present invention is configured as follows.

(1) conveyor of the present invention includes a transport conveyor comprising a driven pulley which is positioned in the drive pulley and the other side located along the conveying direction one side, and a conveyor belt before Symbol wound over pulleys Because
A conveyor frame to which the drive pulley is attached and the driven pulley is attached via a support member;
It said movably engage supported along the support shaft which rotatably protrude from both ends of the driven pulley in the transport direction, and said support member is mounted through the connecting shaft to the side plate portion of said conveyor frame,
A pressing member attached to the support member so as to be elastically biased along the transport direction by a spring and movable along the transport direction to a certain position;
A spring receiving member capable of adjusting the position along the conveying direction, receiving and supporting the spring, and elastically pressing the supporting shaft engaged and supported by the supporting member by the pressing member; ,
A contact member that contacts the lower surface of the top plate portion of the conveyor frame and is mounted on the support member so as to be capable of adjusting the position vertically.

  According to the present invention, the support member for the support shaft of the driven pulley and the tension biasing function for the transport belt are configured in an automatic tension structure that is specially shared by the support member and the press member, so that the press member is moved in the transport direction. By positioning at the movement limit, it is possible to remove the support shaft from the support member without receiving the pressing action of the pressing member, and it becomes easy to remove the driven pulley.

  In addition, since the tension of the conveyor belt can be stabilized over a long period of time by automatic tension by a spring, it is necessary to adjust the tension of the conveyor belt every time the conveyor belt is stretched as the operation progresses. There is no. In addition, the tension of the conveyor belt can be adjusted by adjusting the elastic pressing force to the support shaft by adjusting the position of the spring receiving member. For example, when the biasing force of the left and right springs varies. The tension of the conveyor belt can be made uniform left and right.

  Furthermore, since the contact member provided in the support member is contacted with the top plate portion of the conveyor frame from below to regulate the rotation of the support member around the connecting shaft, the contact member is adjusted up and down. Thus, the height of the support member can be changed, whereby the height of the driven pulley can be easily adjusted.

  Therefore, for example, when the carry-in conveyor is arranged in front of the transfer conveyor, the height of the transfer conveyor start end is adjusted so that there is no step at the end of the load conveyor, so that the weighing is performed from the load conveyor to the transfer conveyor. It is possible to eliminate the ride-on impact or drop impact when an object is transferred.

  (2) In a preferred embodiment of the present invention, the support member is pressed and supported on the inner surface of the side plate portion of the conveyor frame by a coil spring fitted on the connecting shaft.

  According to this embodiment, since the support member is elastically pressed against the inner surface of the side plate portion in the conveyor frame and the entire posture of the support member is maintained, when an external force is applied to the support member laterally outward, The support member is rotated laterally around the tip of the side plate portion as a fulcrum while compressing and deforming the coil spring, whereby the support member can be detached from the support shaft of the driven pulley. Easy to remove.

  (3) In another embodiment of the present invention, the support member can swing upward around the connecting shaft.

  According to this embodiment, the contact member that restricts the rotation of the support member around the connecting shaft by contact with the top plate portion of the conveyor frame from below can be separated downward from the top plate portion. Therefore, by swinging the front part of the support member up and around the connecting shaft, the driven pulley engaged with and supported by the support member is brought close to the drive pulley, and the conveyor belt wound around both pulleys is loosened. be able to.

  (4) In still another embodiment of the present invention, an engagement end having a non-circular cross-sectional shape is formed at an end of the support shaft, an engagement hole is formed in the support member, and the engagement end However, it is engaged with the engagement hole so as to be movable along the transport direction and non-rotatable.

  According to this embodiment, the driven pulley can be freely supported to be automatically tensioned, and the support shaft is easily detached from the support member by relatively separating the support shaft and the support member in the axial direction. Can be made.

  (5) A weighing apparatus according to the present invention includes the conveyor according to the present invention and a weighing unit that measures the weight of an object to be weighed conveyed by the conveyor.

  According to the present invention, it is possible to easily perform maintenance such as pulley removal on a transfer conveyor which is a weighing conveyor, and to smoothly transfer and transfer an object to be weighed without impact from the carry-in conveyor to the weighing conveyor. It is possible to perform measurement with high accuracy in the measurement means.

  As described above, according to the present invention, the conveyor belt can be wound with a stable tension over a long period of time so that reliable and smooth conveyance can be performed, and maintainability is excellent and the height can be easily adjusted. It is possible to obtain a transport conveyor that can be used and a weighing device including the conveyor.

FIG. 1 is an overall perspective view of a weighing device according to an embodiment of the present invention. FIG. 2 is a plan view of the weighing conveyor. FIG. 3 is a perspective view of the driven pulley. FIG. 4 is a plan view crossing a part of the driven pulley. FIG. 5 is a plan view showing the support structure of the driven pulley. FIG. 6 is a plan view showing a state in which the support of the driven pulley is released. 7 is a cross-sectional view taken along the line AA in FIG. FIG. 8 is a longitudinal side view of the driven pulley supporting structure moved upward. FIG. 9 is a perspective view of the support structure of the driven pulley. FIG. 10 is a perspective view of the driven pulley support structure. FIG. 11 is an exploded perspective view of the driven pulley support structure.

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

  FIG. 1 shows an entire weighing apparatus according to an embodiment of the present invention. In this embodiment, description will be made by applying to a weight sorter as a weighing device. This weight sorter is used, for example, by being installed in the middle of an object transportation line, etc., and includes a weighing conveyor 1 that is a conveyor, a carry-in conveyor 2 that carries objects to be weighed into the weighing conveyor 1, and a load cell. A load measuring unit 3 as a weighing means including a load sensor such as an operation setting display 4 for performing various settings such as a boundary weight value for weight selection and displaying a measurement result, etc. It is equipped with the installed base 5.

  In this weight sorter, the objects to be weighed supplied to the carry-in conveyor 2 are transferred to the weighing conveyor 1 and conveyed, and the weight of the entire weighing conveyor 1 including the objects to be weighed is measured during this conveyance. To determine the weight of the object to be weighed, and determine whether the weight of the object to be weighed is, for example, “light”, “appropriate”, or “excess”. Sort by sorting (not shown).

  The weighing conveyor 1 and the carry-in conveyor 2 are basically configured in the same structure, and the structure of the weighing conveyor 1 will be described in detail below.

  FIG. 2 shows a plan view of the weighing conveyor 1. This weighing conveyor 1 has a roller-like driving pulley 7 supported horizontally on the lower side in the conveying direction, which is the rear side (right side in FIG. 2) of the conveyor frame 6 made of plate material, and the conveying that is the front side of the conveyor frame 6. A wide conveyor belt 9 is wound around a roller-like driven pulley 8 that is horizontally supported on the upper side in the direction. The entire weighing conveyor 1 is attached to and detached from the load measuring unit 3. It is configured freely and can be fixed to the load measuring unit 3 by the right and left coupling tools 10.

  As shown in the plan view of FIG. 5 showing the support structure of the driven pulley 8, the conveyor frame 6 includes a top plate portion 6 a that slides and guides the conveyor belt 9, and left and right sides refracted downward along the left and right sides. A pair of side plate portions 6b is provided, and a drive pulley 7 is horizontally supported at the rear end portion of the side plate portion 6b so as to be rotatable as shown in FIG. 2, and at the front end portion of the side plate portion 6b. A driven pulley 8 is supported horizontally so as to freely rotate.

  A drive motor (not shown) is arranged below one rear side (the upper right side in FIG. 2) of the conveyor frame 6, and this drive motor and one end of the drive pulley 7 are connected to a chain, a coupling, or the like. It is linked and connected through.

  As shown in FIG. 2, the inner peripheral surface of the conveyor belt 9 is provided with a ridge 9a that is an elongated protrusion along the longitudinal direction of the belt (the left-right direction in FIG. 2), and the drive pulley 7 and the driven pulley 8 The guide belt 11 formed in the outer peripheral surface of the belt is engaged with the guide belt 11, and the left and right meandering of the rotating conveyor belt 9 is prevented by this engagement. In addition, the protrusion 9a and the guide groove 11 are provided in one place deviated from the longitudinal direction (vertical direction in FIG. 2) of the drive pulley 7 and the driven pulley 8, and the drive pulley 7, the driven pulley 8, and The conveyor belt 9 is assembled in a fixed posture.

  3 and 4 show the appearance of the driven pulley 8 and a plane crossing a part thereof. The driven pulley 8 includes a cylindrical roller main body 12, a support shaft 13 inserted through the cylindrical roller main body 12, a pair of left and right bearings 14 fitted and fitted near both ends of the roller main body 12, and inner fits at both ends of the roller main body 12. It is comprised with the cap 15 connected.

  The roller body 12 is set in a straight cylindrical shape having a large diameter L1 on the center side in the pulley axial direction, and the range L2 from both ends of the straight cylinder range L1 to the outer end is smaller in diameter toward the outer end. The guide groove 11 is formed in one place of the straight tube range L1.

  In this way, by forming the pulley in the middle swelling having the taper range L2 on both sides of the straight tube range L1, if the meandering occurs when the conveyor belt 9 is wound around the pulley and rotates, the belt tension In this way, a component force toward the center in the belt width direction is generated, meandering is suppressed, the thrust force in the pulley axial direction acting on the engagement portion between the protrusion 9a and the guide groove 11 is reduced, and the side surface wear of the protrusion 9a is reduced. Can be reduced.

  The roller body 12 is formed by cutting the inner periphery and the outer periphery of a pulley material made of a straight stainless steel material having a constant thickness over the entire length. In this roller body 12, the inner circumference of the pulley material is cut so that the thickness on both sides of the portion where the guide groove 11 is formed is the same as the height of the ridge 9a or smaller than the height of the ridge 9a. The annular protrusion 12a is left and formed on the inner periphery of the pulley body 12, and the guide groove 11 is cut and formed on the outer periphery of the annular protrusion 12a. Thus, by forming the roller body 12 to be thin and lightweight, it is possible to configure a pulley with a small dynamic balance.

  The drive pulley 7 is also configured using a roller body having the same configuration as described above, but a structure for receiving a rotational driving force is provided on one end side in the axial direction of the roller body.

  5 is a plan view showing the support structure of the driven pulley 8, FIG. 6 is a plan view showing a state in which the support is released, FIG. 7 is a cross-sectional view taken along line AA in FIG. FIG. 9 and FIG. 10 are perspective views of the main part of the support structure of the driven pulley 8 and FIG. 11 is an exploded perspective view thereof.

  Based on these drawings, a structure for supporting the driven pulley 8 at both left and right ends will be described in detail.

  Engagement end portions 13a cut into an oval cross-sectional shape are formed at the left and right end portions of the support shaft 13 protruding from both ends of the driven pulley 8, and the engagement end portions 13a are formed on the conveyor frame 6. It is supported by the supporting member 21 mounted on the side plate portion 6b so as not to rotate.

  The support member 21 is made of a stainless steel plate, and its rear portion is arranged in a vertical posture along the inner side of the side plate portion 6b. The connecting shaft 22 with a head is inserted from the outside across the side plate portion 6b and the support member 21. Is done. A coil spring 23 is fitted on the insertion end side of the connecting shaft 22 and is supported by a nut 24 so that the connection member 22 is pressed and supported by the elasticity of the coil spring 23 in a posture along the inner side of the side plate portion 6b. The Further, by adjusting the nut 24 to increase or decrease the amount of compression of the coil spring 23, the force for pressing and supporting the support member 21 to the side plate portion 6b can be adjusted.

  A long rectangular engagement hole 25 is formed in the front part of the support member 21 in the front and rear, and the engagement end part 13a of the support shaft 13 in the driven pulley 8 cannot rotate, and the front and rear parts It is inserted and supported so as to be movable. The left and right support members 21 are engaged with both engaging end portions 13a of the support shaft 13, whereby the left and right movement of the support shaft 13 is prevented and the driven pulley 8 is positioned in the axial direction.

  Guide pieces 21a and 21b are refracted inwardly on the upper and lower sides of the support member 21, and detachment prevention claws 21c and 21d are refractively connected to the front ends of the guide pieces 21a and 21b. The pressing member 26 which is positioned up and down by the guide pieces 21a and 21b and prevented from inwardly moving by the locking stoppers 21c and 21d can be moved back and forth along the inner surface of the support member 21, and the locking stopper claw. 21c and 21d are mounted in a state where forward movement beyond a certain forward position is restricted and restricted.

  The pressing member 26 is also made of a stainless steel plate, and its rear portion is refracted inward and is formed in an L shape in plan view. A forward U-shaped opening 27 that engages with the circular peripheral portion of the support shaft 13 is provided at the front end of the pressing member 26, and a spring is provided on the rear surface of the refracting piece 26 a provided at the rear of the pressing member 26. The receiving member 28 is screwed.

  On the other hand, a refracting piece 21e that protrudes inward is also provided at the rear part of the support member 21, and a screw shaft 30 that is screwed in the front and rear direction and is fastened and fixed by a lock nut 29 is attached to the refracting piece 21e. Yes. A spring receiving member 31 is engaged and supported at the front end of the screw shaft 30, and a large-diameter coil spring 32 is moderately compressed across the spring receiving member 28 of the pressing member 26 and the spring receiving member 31 of the supporting member 21. The pressing member 26 is slid forwardly biased by the elastic force of the coil spring 32 and the support shaft 13 engaged with the pressing member 26 is pressed forward to wind around the driven pulley 8. An automatic tension structure that tensions the conveyor belt 9 forward is configured.

  Here, in the left and right support structures, the elasticity of the left and right coil springs 32 can be adjusted separately by rotating the screw shaft 30 and adjusting the position of the spring receiving member 31 back and forth. Automatic tension can be applied to the left and right uniformly with a desired tension.

  The adjustment of the elasticity of the coil spring 32 is not limited to the adjustment of the position of the spring receiving member 31 on the support member 21 side, and the position may be adjusted by the spring receiving member on the pressing member 26 side.

  From the upper end of the refracting piece 21e in the support member 21, a tongue piece 21f that enters the lower portion of the top plate portion 6a in the conveyor frame 6 is refracted and extended. The tongue 21f piece is provided with a contact screw 34 as a contact member that is screwed up and down and fixed by a lock nut 33. The upper end of the contact screw 34 is connected to the lower surface of the top plate portion 6a. , The supporting member 21 supporting the driven pulley 8 on the front end side and having a heavy front portion is prevented from rotating around the connecting shaft 22 in the forward downward direction, and the contact screw By adjusting the amount of protrusion 34, the posture of the support member 21 around the connecting shaft 22 is changed, and the height position of the driven pulley 8 can be changed and adjusted separately for the left and right sides. That is, the height of the front end of the weighing conveyor 1 and the right / left inclination can be adjusted.

  When the support member 21 pressed and supported on the inner surface of the side plate portion 6b in the conveyor frame 6 by the coil spring 23 applies a large external force laterally outward at the front end side thereof, as shown in FIG. The contact point p with the front end of 6b is turned laterally outward with the contact point p as a fulcrum. At this time, the rear portion of the support member 21 is separated from the side plate portion 6b with respect to the inclined connecting shaft 22 while the inward movement is prevented by the contact between the head portion 22a and the outer surface of the side plate portion 6b. The coil spring 23 is compressed and deformed by tilting in the direction.

  In this manner, the front portion of the support member 21 is inclined and opened laterally outward, so that the support member 21 and the pressing member 26 are removed from the support shaft 13 and the driven pulley 8 can be removed. In this case, the pressing member 26 released from the support shaft 13 becomes free to slide forward until it is received by the locking claws 21c and 21d.

  The support member 21 is connected and supported in a posture along the side plate portion 6b by the connecting shaft 22 and is prevented from rotating in the forward and downward direction by the abutting screw 34. Therefore, the supporting member 21 is supported using the connecting shaft 22 as a fulcrum. The member 21 can be swung up and rotated upward. When the support member 21 is swung up and rotated, the pressing member 26 urges and advances forward so as to absorb the looseness according to the looseness of the transport belt 9, but the pressing member 26 is received by the catching claws 21c and 21d. After moving to the forward movement limit, the support member 21 is further swung up and rotated to narrow the pulley interval and loosen the conveyor belt 9. Thereby, the conveyor belt 9 can be easily removed from the side of the conveyor frame 6. When the pressing member 26 has moved to the forward movement limit, the support shaft 13 does not receive the forward pressing force from the pressing member 26, and the driven pulley 8 supports the left and right without dropping both ends of the support shaft 13. It is in a state where it is engaged and supported by the member 21 in a state where it can move slightly forward and backward, and the front portion of the support member 21 can be easily detached from the support shaft 13 by tilting laterally outward.

  In addition, since the carrying-in conveyor 2 is comprised similarly to the said weighing conveyor 1, description of the structure is abbreviate | omitted.

  As described above, according to the present embodiment, the large-diameter coil spring 32 is fitted and supported in a moderately compressed state across the spring receiving member 28 of the pressing member 26 and the spring receiving member 31 of the support member 21. The pressing member 26 is slid forward by the elastic force, and the support shaft 13 engaged with the pressing member 26 is pressed forward, thereby automatically tensioning the conveyor belt 9 wound around the driven pulley 8 forward. Structure is constructed.

  Thus, the tension of the conveyor belt 9 can be stabilized over a long period of time, so that it is not necessary to adjust the tension of the conveyor belt 9 every time the conveyor belt is stretched as the operation progresses.

  In addition, when the elasticity of the left and right coil springs 32 varies, the elasticity of the left and right coil springs 32 can be adjusted separately by adjusting the position of the spring receiving member 31 in the front-rear direction. Automatic tension can be applied to the left and right uniformly with a desired tension.

  Further, by adjusting the protrusion amount of the contact screw 34 attached to the tongue piece 21f of the support member 21, the posture of the support member 21 around the connecting shaft 22 is changed, and the height position of the driven pulley 8 is changed. For example, the height of the front end of the weighing conveyor 1 and the right / left inclination can be easily adjusted.

  Furthermore, by opening the support member 21 laterally outward, the support member 21 and the pressing member 26 can be detached from the support shaft 13 and the driven pulley 8 can be easily removed.

(Other embodiments)
The present invention can also be implemented in the following forms.

  (1) The cross-sectional shape of the engagement end portion 13 a provided at both ends of the support shaft 13 is prevented from rotating by engagement with the engagement hole 25 of the support member 21, and front and rear along the engagement hole 25. Any non-circular shape can be used as long as it is slidable, and not only the above-described oval shape, for example, a D shape having one flat surface, or a rectangular shape having a pair of flat surfaces facing each other. You can also.

  (2) The front end of the pressing member 26 may be formed in a straight line along the vertical direction, and the circular outer periphery of the support shaft 13 may be pressed forward by the straight front end side. In this case, the front end of the pressing member 26 is refracted inward to form a straight front end side having a large left and right width, thereby ensuring a large contact length in the axial direction with the circular peripheral surface of the support shaft 13. be able to.

  (3) The refraction piece 26a of the pressing member 26 can be pressed or burred to integrally form the spring receiving member 28 that protrudes backward from the refraction piece 26a. According to this, the number of parts and the number of assembly steps can be reduced. You can save.

DESCRIPTION OF SYMBOLS 1 Weighing conveyor 3 Load measuring part 6 Conveyor frame 6a Top plate part 6b Side plate part 7 Drive pulley 8 Driven pulley 9 Conveyor belt 13 Support shaft 13a Engagement end part 21 Support member 22 Connection shaft 23 Coil spring 25 Engagement hole 26 Press member 31 Spring receiving member 32 Coil spring

Claims (5)

A conveyor comprising a driven pulley which is positioned in the drive pulley and the other side is located on one side along the conveying direction, and a conveyor belt before Symbol wound over pulleys,
A conveyor frame to which the drive pulley is attached and the driven pulley is attached via a support member;
It said movably engage supported along the support shaft which rotatably protrude from both ends of the driven pulley in the transport direction, and said support member is mounted through the connecting shaft to the side plate portion of said conveyor frame,
A pressing member attached to the support member so as to be elastically biased along the transport direction by a spring and movable along the transport direction to a certain position;
A spring receiving member capable of adjusting the position along the conveying direction, receiving and supporting the spring, and elastically pressing the supporting shaft engaged and supported by the supporting member by the pressing member; ,
An abutting member that abuts on the lower surface of the top plate portion of the conveyor frame, and is mounted on the support member so that the position can be adjusted up and down;
Conveyor characterized by comprising. The support member is pressed and supported on the inner surface of the side plate portion of the conveyor frame by a coil spring externally fitted to the connecting shaft.
The transport conveyor according to claim 1. The support member is swingable upward around the connecting shaft.
The conveyance conveyor of Claim 1 or 2. An engagement end portion having a non-circular cross-sectional shape is formed at an end portion of the support shaft, an engagement hole is formed in the support member, and the engagement end portion is formed in the engagement hole along the transport direction. Engaged and non-rotatable,
The conveyance conveyor in any one of Claim 1 thru | or 3. The transport conveyor according to any one of claims 1 to 4, and a weighing means for weighing the weight of an object to be weighed transported by the transport conveyor.
A weighing device characterized by that.

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