JP2013082521A - Drive device for modular plastic belt conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive device for a modular plastic conveyor belt stretched between front and rear driven rollers in an endless state, configured to prevent wear or breakage of the modular plastic conveyor belt, while stably driving the modular plastic conveyor belt.SOLUTION: The modular plastic conveyor belt 4 is stretched from the front peripheral part to the lower peripheral part of a driving sprocket 11 on the return side of the modular plastic conveyor belt 4. A disengaging member 14 formed in a pawl shape is provided from the rear peripheral part to the lower peripheral part of the driving sprocket 11. The modular plastic conveyor belt is configured to circulate and run toward a guide roller 16 located on the rear side, along the outer surface of the disengaging member 14, while the modular plastic conveyor belt 4 is disengaged from the lower peripheral part of the driving sprocket 11 by means of the leading end portions of the disengaging member 14.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt conveyor formed by ending a modular plastic conveyor belt in an endless manner, and more particularly to a belt conveyor driving device that travels linearly on a horizontal plane without bending in the width direction.

  Conventionally, as this type of modular plastic conveyor belt, for example, as described in Patent Document 1, a structure in which a large number of plastic belt modules are sequentially connected by a rod shaft so as to be able to be bent in a joint shape. Are known.

  Specifically, as shown in FIGS. 5 to 7, the plastic belt module (hereinafter referred to as the belt module 40) is directed in a direction opposite to the traveling direction of the plurality of top surface portions 43a facing the traveling direction of the belt. A plurality of top surface portions 43b and intermediate portions 43 formed alternately in the belt width direction via leg piece portions 43c and 43c, and projecting from the top surface portions 43a and 43b in the intermediate portion 43, and The front and rear link end portions 41 and 42 are provided with connecting lateral holes 46 and 47 penetrating in the belt width direction, and the belt modules 40 are sequentially arranged in the belt length direction, The belt module 40 that follows the belt module 40 that is adjacent to the gap between the link end portions 42 and 42 that protrudes in the direction opposite to the belt traveling direction (hereinafter referred to as the front side) (hereinafter referred to as the rear side). Insert the front link end 41 of the belt into the belt width direction. The modular plastic conveyor belt 4 is obtained by inserting the shaft rod 48 into the connecting lateral holes 46 and 47 of the link end portions 41 and 42 and connecting the belt modules 40 and 40 in a vertically and articulated manner. Is configured.

  Further, in the modular plastic conveyor belt 4 configured as described above, adjacent ones of the link end portions adjacent to each other in the belt width direction are connected with the width interval between the opposite side surfaces being substantially equal to the width of one link end portion. The side faces of the link ends of the belt module that are opposed to each other are formed so as to be in sliding contact with each other. Therefore, in the belt module 40, the front and rear link ends 41 and 42 are alternately continued. The leg piece 43c is formed as an inclined leg piece that is inclined in the belt width direction, and the link end part on the front side of the succeeding belt module 40 inserted between the rear link end parts 42, 42 of the preceding belt module 40. A flat trapezoidal engagement hole 44 penetrating in the vertical direction is formed by a space surrounded by the rear end surface of 41 and the opposing side wall surface of the inclined leg piece 43c, and this engagement hole 44 will be described later. Thus, the conveyor belt is driven by engaging the teeth of the drive sprocket 11 '.

  On the other hand, as described in Patent Document 2, a conveyor belt is looped endlessly between guide pulleys that are rotatably arranged in the front-rear direction, and an intermediate portion between the front and rear guide pulleys on the return side of the conveyor belt 2. Description of the Related Art A belt conveyor is widely known in which a driving pulley is arranged and a conveyor belt is driven and driven by the driving pulley. In recent years, the modular plastic conveyor belt 4 has been adopted as a conveyor belt as described in Patent Document 2 to construct a belt conveyor that is lightweight, excellent in chemical resistance, and easy to clean. ing.

  In this case, as shown in FIGS. 8 and 9, the modular plastic conveyor belt 4 is stretched in an endless manner in the horizontal direction between the driven rollers 2 ′ and 3 ′ that are rotatably arranged in the front-rear direction. A drive sprocket 11 'is disposed in the middle between these front and rear driven rollers 2' and 3 'on the return side, and on the return side, the modular plastic conveyor belt 4 is allowed to travel while being loosened, and the front and rear of the drive sprocket 11'. A pair of front and rear guide rollers 13 'and 14' are disposed above the side, and the conveyor belt 4 is engaged with the front peripheral portion of the drive sprocket 11 'by the front guide roller 13' and the rear guide roller 3 'and the rear The modular plastic conveyor belt 4 is driven by the tensile force due to the weight of the conveyor belt portion that is slackened between the side driven rollers 3 '. 1 'teeth are forcibly engaged, and the front and rear guide rollers 13' and 14 'hang the modular plastic conveyor belt 4 over the drive sprocket 11' over an arc length range of approximately 270 degrees. The modular plastic conveyor belt 4 is driven to run by the rotation of the drive sprocket 11 '.

JP 2003-12134 A Utility Model Registration No. 2556944

  However, as described above, the modular plastic conveyor belt 4 is stretched over an arc length range of about 270 degrees from the lower periphery of the drive sprocket 11 'to both sides of the upper periphery. When the modular plastic conveyor belt 4 is driven to travel, there is a risk that the modular plastic conveyor belt 4 may be stretched due to excessive tensile force acting on the modular plastic conveyor belt 4. There is a problem that cannot be done.

In particular, in the upper peripheral portion of the rear peripheral surface of the drive sprocket 11 ′ that sends the modular plastic conveyor belt 4 to the rear side, the belt modules 40 and 40 adjacent to the front and rear of the modular plastic conveyor belt 4 are connected to the drive sprocket. The guide roller 14 'disposed above the rear periphery of 11' is refracted with the shaft rod 48 as a fulcrum in the direction along the outer periphery of the drive sprocket 11 'and engages with the drive sprocket 11'. In this case, a contraction force is generated in the belt length direction, while an expansion force is generated on the outer surface side of the front link end 41 facing the engagement hole 44 with which the teeth of the drive sprocket 11 'are engaged. The drive sprocket 11 'is pressed and locked more firmly so that the rear end surface bites into the teeth of the drive sprocket 11'.
Not only does it become impossible to detach from the link smoothly, but there also arises a problem that the link end is worn or missing.

  The present invention has been made in view of such a problem, and an object of the present invention is to achieve stable engagement without generating an unnecessarily strong engagement force between the drive sprocket and the modular plastic conveyor belt. It is an object of the present invention to provide a driving device for a modular plastic belt conveyor that can be smoothly driven while being stopped to prevent the occurrence of wear and breakage.

  In order to achieve the above object, a driving device for a modular plastic belt conveyor according to the present invention comprises a modular plastic conveyor between driven rollers respectively disposed on a transport start end side and a transport end end side. A driving sprocket is arranged in the intermediate part where the belt is stretched endlessly and returned from the conveying terminal part to the conveying terminal part, and the modular plastic conveyor belt is placed on the driving sprocket above the modular plastic conveyor belt entry side of the driving sprocket. On the other hand, a guide roller for feeding is arranged, and a disengagement member for disengaging the modular plastic conveyor belt from the drive sprocket is arranged on the delivery side of the modular plastic conveyor belt so that the tip faces the lower periphery of the drive sprocket. And is engaged It is configured so as a modular plastic conveyor belt had passed over the outer surface of the engagement releasing member fed into the driven roller side of the conveyance start end side.

  In the drive device for a modular plastic belt conveyor configured as described above, the invention according to claim 2 is characterized in that, as the structure of the disengagement member, the inner surface is formed as a curved surface along the peripheral surface of the drive sprocket and the outer surface is a convex circle. It is curved and formed on the sliding guide surface of the modular plastic conveyor belt, and the tip that faces the lower periphery of the drive sprocket is formed in a claw shape that is thin toward the tip. It is characterized by.

  Furthermore, the invention according to claim 3 is characterized in that a receiving roller for holding the modular plastic conveyor belt together with the drive sprocket is disposed below the lower peripheral portion of the drive sprocket in the vicinity of the tip of the disengagement member. To do.

  According to the first aspect of the present invention, the modular plastic conveyor belt is stretched endlessly between the driven rollers respectively disposed on the conveyance start end side and the conveyance termination end side, and from the conveyance termination end to the conveyance termination end. A driving sprocket is arranged in the returning intermediate part, and a guide roller for feeding the modular plastic conveyor belt to the driving sprocket is arranged above the modular plastic conveyor belt entry side of the driving sprocket, while the modular plastic conveyor belt is fed out. Since the disengagement member that disengages the modular plastic conveyor belt from the drive sprocket is arranged with the tip facing the lower periphery of the drive sprocket, the modular plastic conveyor belt fed from the guide roller is conveyed Face to end side A modular plastic conveyor belt is formed immediately before the drive sprocket is disengaged from the lower periphery of the drive sprocket in a state of being spanned from the front periphery to the lower periphery of the drive sprocket. Adjacent belt modules in the belt module row can be separated from the drive sprocket without refracting them in the direction of biting into the teeth of the drive sprocket more than necessary with the shaft rod as the center. Thus, it is possible to drive the belt module while suppressing the wear and loss of the link end portion of the belt module pressed in the traveling direction.

  In addition, since a disengagement member having a tip facing the lower peripheral portion of the drive sprocket is disposed on the delivery side of the modular plastic conveyor belt, the modular plastic conveyor belt reaching the lower peripheral portion of the drive sprocket is attached to this engagement member. Modular plastic that can be smoothly removed from the teeth of the drive sprocket while the belt inner surface side engaged with the drive sprocket is expanded by returning to the horizontal state by the tip of the release member and maintaining a stable running state The conveyor belt can be fed from the drive sprocket to the driven roller side on the conveyance start end side through the outer peripheral surface of the disengagement member.

  According to a second aspect of the present invention, the disengagement member has an inner surface formed on a curved surface along the circumferential surface of the drive sprocket and an outer surface formed on a convex arcuate sliding surface of a modular plastic conveyor belt. In addition, the claw-shaped tip part of the claw-shaped tip part forms a modular plastic conveyor belt that reaches the lower part of the drive sprocket. Can be easily and surely separated from each other, and can smoothly travel toward the driven roller on the conveyance start end side through the convex arc-shaped sliding surface of the disengagement member.

  According to the invention of claim 3, since the receiving roller for holding the modular plastic conveyor belt together with the drive sprocket is disposed below the lower peripheral portion of the drive sprocket in the vicinity of the tip of the disengagement member, This receiving roller can be driven and driven by the drive sprocket while maintaining the state in which the modular plastic conveyor belt is securely engaged with the drive sprocket.

A simplified side view of a modular plastic belt conveyor. The side view of the drive device part. FIG. The top view of a drive sprocket part. The top view of a part of modular plastic conveyor belt. The back view. The perspective view of a belt module. The simplified side view of the modular plastic belt conveyor provided with the well-known drive device. The perspective view of the drive device part.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 4, a modular plastic belt conveyor rotates driven rollers 2 and 3 between a front end portion and a rear end portion of a machine base 1. A modular plastic conveyor belt 4 is stretched endlessly between the front and rear driven rollers 2 and 3 and is freely supported by the machine base 1 from the rear driven roller 3 side toward the front driven roller 2. It is configured to travel in the length direction of the machine base 1 and to travel and travel along the lower surface of the machine base 1 from the front driven roller 2 to the rear driven roller 3, A drive unit 10 for the modular plastic conveyor belt 4 is disposed in the middle of the return path of the modular plastic conveyor belt 4 that travels from the front driven roller 2 toward the rear driven roller 3.

  The drive device 10 includes a drive sprocket 11 for driving the modular plastic conveyor belt 4 in the belt length direction, a drive motor 12 for rotating the drive sprocket 11, and a front driven roller 2 to the drive sprocket 11. The front guide roller 13 disposed above the front peripheral portion of the drive sprocket 11 facing the entry side of the modular plastic conveyor belt 4 entering toward the front side, and the delivery side of the modular plastic conveyor belt 4 from the drive sprocket 11 A disengagement member 14 for disengaging the modular plastic conveyor belt 4 from the drive sprocket 11 by disposing the front end of the drive sprocket 11 to face the lower periphery of the drive sprocket 11; It is arranged below the lower periphery of the sprocket 11 and is connected to the drive sprocket 11 A receiving roller 15 sandwiching the dura plastic conveyor belt 4 and a modular plastic conveyor belt 4 disposed on the rear upper side of the disengagement member 14 and fed out from the drive sprocket 11 side through the outer surface of the disengagement member 14. And a rear guide roller 16 that returns to the rear driven roller 3 in a slackened state.

  The drive sprocket 11, the front guide roller 13, and the receiving roller 15 are supported by a support plate material 17 that is suspended at the center of the machine 1 in the longitudinal direction of the machine base 1, and the support plate material 17 On the other hand, the disengagement member 14 is mounted on the rear guide roller 16, and the rear guide roller 16 is supported by a bracket 18 suspended from the machine base 1 so that the rotation center axis thereof is supported. The support plate 17 is mounted on the back side. Further, as shown in FIGS. 3 and 4, the drive sprocket 11 has a large number of teeth 11a continuous in the circumferential direction at a constant interval in the axial center direction of the drive sprocket 11 at the center of the disk portion. 11b projecting from each other, the front teeth 11a and the back teeth 11b as viewed from the shaft end side are provided so as to overlap each other. The disengagement members 14 and 14 are disposed on the outer peripheral surface rear peripheral side on both sides of the disk portion across the 11a and 11b rows.

  These disengagement members 14 and 14 have a length equal to approximately 1/4 of the circumferential length of the drive sprocket 11, and the disk portion of the drive sprocket 11 on which the teeth 11a and 11b are not projected. It is formed in the shape of a short square bar having a thickness approximately equal to the thickness of both side portions, and its inner surface is curved along the outer peripheral surface of the disk portion of the drive sprocket 11, and the lower peripheral portion side of the drive sprocket 11 It is formed in the nail | claw shape which becomes thin-walled gradually toward the tip. Specifically, the inner surface of the disengagement member 14 is formed on a curved surface 14a that is curved with the same degree of curvature as the circular circumferential surface of the disk portion of the drive sprocket 11, and the outer surface is formed in a tapered shape. It is formed on the sliding guide surface 14b of the modular plastic conveyor belt 4 curved in a gentle convex arc shape from the front end to the base end.

  The two disengagement members 14 and 14 are fixed to the lower end portion of the mounting member 19 so that the base end portion has an interval equal to the interval between both side portions of the disk portion of the drive sprocket 11. The engagement release members 14 and 14 are bent from the rear peripheral portion to the lower peripheral portion of the disk portion of the drive sprockets 11a and 11b so as to sandwich the teeth 11a and 11b protruding from the drive sprocket 11. The mounting member 19 is fixed to the support plate 17 so as to be along the inner surface 14a and the front end of the inner surface 14a is exposed from the rear side between the drive sprocket 11 and the receiving roller 15.

  On the other hand, the modular plastic conveyor belt 4 that is stretched endlessly between the front and rear driven rollers 2 and 3 and driven by the drive sprocket 11 has a number of moldings having a certain width as shown in FIGS. A plastic belt module (hereinafter, referred to as a belt module 40) is connected to a plastic shaft rod 48 so as to be bent in a joint-like manner in order.

  The belt module 40 includes a plurality of (three in the figure) front link end portions 41, 41, 41 directed in the belt running direction at regular intervals in the width direction, and the belt module 40 at regular intervals in the width direction. A plurality of (three in the figure) rear link ends 42, 42, 42 facing in the direction opposite to the traveling direction are integrally formed via an intermediate portion 43. Specifically, the front and rear link end portions 41 and 42 are formed in a planar rectangular shape having a constant thickness, and project from the intermediate portion 43, that is, the front end surface and the rear link end portion 42 of the front link end portion 41. The rear end surface is formed as a curved surface curved in a convex arc shape from the outer surface side toward the inner surface side with the surface side facing the drive sprocket 11 as the inner surface.

  Further, the intermediate portion 43 has a front top surface portion 43a directed in the traveling direction and a rear top surface portion 43b directed in the opposite direction to the traveling direction alternately zigzag in the belt width direction via the inclined leg piece portions 43c. The base surface of the front link end portion 41 and the rear link end portion 42 are integrally provided on each front top surface portion 43a and each rear top surface portion 43b. From 43b, a front link end 41 and a rear link end 42 are provided so as to project in a direction perpendicular to the belt width direction.

  In addition, the width interval between the opposite side surfaces of the front link end portions 41, 41 adjacent in the belt width direction and the width interval between the opposite side surfaces of the rear link end portions 42, 42 are formed to be the same width. These width intervals are substantially equal to the width of one link end, and when the modular plastic conveyor belt is constructed, the rear belt module 40 is interposed between the rear link ends 42, 42 of the front belt module 40. When the front link end portion 41 is inserted and fitted, the opposite side surfaces of the rear link end portions 42 and 42 are formed so that both side surfaces of the front link end portion 41 are in sliding contact. In the belt module, both end portions of the rear top surface portion 43b of the intermediate portion 43 are connected to both end portions of the front top surface portions 43a and 43a arranged on both sides in front of the rear top surface portion 43b. The inclined leg pieces 43c, 43c are gradually inclined in the widening direction from both side ends of the rear top surface portion 43b toward the opposite side ends of the front top surface portions 43a, 43a.

Accordingly, the front end surface of the rear top surface portion 43b in the belt module 40 and the rear end surface of the rear link end portion 42 of the front belt module 40 inserted between the adjacent front link end portions 41, 41 in the belt module 40. Inclined leg piece 43c arranged between the opposing surfaces and on both sides between the opposing surfaces
, 43c are formed in the trapezoidal engagement holes 44, 44 penetrating in the vertical direction by the space surrounded by the opposing side surfaces and narrowing toward the rear. 44 is configured to be engageable so that the teeth 11a and 11b of the drive sprocket 11 are engaged with each other. That is, the interval between the two engagement holes 44 and 44 and the interval between the teeth 11a and 11b row of the drive sprocket 11 are made equal. Similarly, the front end surface of the front link end portion 41a of the rear belt module 40 inserted between the rear end surface of the front top surface portion 43a of the belt module 40 and the adjacent rear link end portions 42, 42 of the belt module 40. A flat trapezoidal hole 45 penetrating in the vertical direction is formed by a space surrounded by the space between the opposed surfaces and the inclined leg pieces 43c disposed on both sides between the opposed surfaces. Is done. It should be noted that the teeth 11a and 11b of the drive sprocket 11 are not engaged with the hole 45.

  Further, the front link end 41 and the rear link end 42 of all the belt modules 40 are respectively provided with connecting lateral holes 46 and 47 penetrating in the belt width direction. The front link in the rear belt module 40 corresponding to the space between the rear link ends 42, 42 between the adjacent rear link ends 42, 42 in the front belt module 40, which are arranged side by side in the vertical direction. The end portion 41 is inserted, and the shaft rod 48 is inserted in a through state into the connecting holes 46 and 47 of the front and rear link end portions 41 and 42 communicated in the belt width direction, and the belt with the shaft rod 48 as a fulcrum. The modular plastic conveyor belt 4 is configured by connecting the modules 40 and 40 in a jointable manner in the vertical direction. The front and rear link end portions 41 and 42 are inclined at both end surfaces so that the width gradually decreases from the outer surface side toward the inner surface side.

As shown in FIG. 1, the modular plastic conveyor belt 4 configured as described above is hung between the front and rear driven rollers 2 and 3 in a state where the outer surface of the machine base 1 is on the horizontal surface of the machine base 1 so as to be the article conveying surface. In addition, on the lower surface side of the machine base 1, the front driven roller 2, the guide roller 13, the drive sprocket 11, the sliding guide surface 14 a of the disengagement member 14, the rear guide roller 16, and the rear driven roller 3 are sequentially provided. The belt conveyer that travels endlessly is formed. The modular plastic conveyor belt 4 has teeth 11a and 11b on both sides of the drive sprocket 11 engaged with two engaging holes 44 and 44 provided between the belt modules 40 and 40 adjacent to each other in the front and rear directions. Top surface portion 43a of the front link end portions 41, 41 of the belt module 40
The modular plastic conveyor belt 4 is driven to run by pressing the teeth 11a and 11b of the drive sprocket 11 to mesh with the rear end face of 43a.

  In this state, when the drive sprocket 11 is rotationally driven by the drive motor 12, the modular plastic conveyor belt 4 is drawn to the drive sprocket 11 through the front guide roller 13 disposed above the front peripheral portion of the drive sprocket 11, On the lower surface side of the machine base 1, it travels from the front driven roller 2 to the drive sprocket 11 via the front guide roller 13, while on the machine base 1, the modular plastic conveyor belt 4 extends from the rear driven roller 3. It travels toward the front driven roller 2 and conveys articles and the like.

  Further, the modular plastic conveyor belt 4 delivered from the drive sprocket 11 travels to the rear roller 3 side while slackening between the rear driven roller 3 and the rear guide roller 16, and the modular plastic conveyor belt 4 traveling between them. The modular plastic conveyor belt 4 is pressed against the lower peripheral portion of the drive sprocket 11 by the weight of the drive sprocket 11 and engaged with the drive sprocket 11 while the receiving roller 15 securely holds the engagement.

  When the modular plastic conveyor belt 4 that runs downward from the front guide roller 13 side and hangs from the front periphery to the lower periphery of the drive sprocket 11 reaches the lower periphery of the drive sprocket 11, the drive sprocket 11 11 and the modular plastic conveyor belt 4 immediately after being fed from the receiving roller 15 are engaged with the teeth 11a and 11b of the drive sprocket 11 by the disengagement member 14 facing the lower end of the drive sprocket 11. The engagement is released from the lower peripheral portion of the drive sprocket 11 to the rear guide roller 16 side along the convex guide arc curved slide guide surface 14b.

  At this time, the belt module 40 row portion of the modular plastic conveyor belt 4 stretched around the drive sprocket 11 is refracted in an articulated manner along the circular curved surface of the drive sprocket 11 with the shaft rod 48 as a fulcrum. On the side, the belt is contracted in the belt length direction and engaged and engaged with the teeth 11a and 11b of the drive sprocket 11, while being driven by the drive sprocket 11, the drive sprocket 11 is driven by the disengagement member 14. Since the engagement is released while returning to the horizontal state, the inner surface of the modular plastic conveyor belt 4 is expanded and the front wall surfaces of the engagement holes 44, 44 engaged with the teeth 11a, 11b of the drive sprocket 11, that is, The rear end surfaces of the top surface portions 43a and 43a of the front link end portions 41 and 41 of the belt module 40 are smoothly separated from the teeth 11a and 11b of the drive sprocket 11. Bets can be, it is possible to maintain a stable travel driving while suppressing wear and loss of link ends of the belt module 40.

1 Machine 2, 3 Front and rear driven rollers 4 Modular plastic conveyor belt
10 Drive unit
11 Drive sprocket
13 Front guide roller
14 Disengagement member
15 Receiving roller
16 Rear guide roller
40 Belt module
41, 42 Front and rear link ends
43 Middle part
44 engagement hole
46, 47 Connecting hole
48 axis rod

Claims (3)

  A modular plastic conveyor belt is looped endlessly between the driven rollers arranged on the conveyance start end side and conveyance end end side, and a drive sprocket is arranged in the intermediate part returning from the conveyance termination end to the conveyance termination end. A guide roller for feeding the modular plastic conveyor belt to the drive sprocket is disposed above the modular plastic conveyor belt entry side of the drive sprocket, while the leading end of the modular plastic conveyor belt is at the lower periphery of the drive sprocket. A disengagement member that disengages the modular plastic conveyor belt from the drive sprocket is disposed, and the disengaged modular plastic conveyor belt is conveyed over the outer surface of the disengagement member. The driven roller on the start end side Modular plastic conveyor belts of the driving apparatus characterized by being configured to pump the.   The disengagement member has an inner surface formed as a curved surface along the peripheral surface of the drive sprocket, and an outer surface curved into a convex arc shape to form a sliding guide surface of the modular plastic conveyor belt, and is provided under the drive sprocket. 2. The driving device for a modular plastic conveyor belt according to claim 1, wherein a tip portion facing the peripheral portion is formed in a claw shape that becomes thinner toward the tip.   2. The modular plastic conveyor belt according to claim 1, further comprising a receiving roller that sandwiches the modular plastic conveyor belt together with the driving sprocket at a lower portion of the driving sprocket in a vicinity of a tip of the disengagement member. Drive device.

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