JP2000219311A - Belt conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt conveyor furnished with a driving part not to produce an abrased mark at least on a central part in the cross direction of a belt outer surface. SOLUTION: A drive mechanism A of a belt conveyor is constituted of a short cylindrical drive pulley 7 arranged in the inside of a belt to one side in the cross direction of the belt 6 and a pinch roller 8 arranged on the outside of the belt wound around an outer peripheral surface of the drive pulley, and additionally, a guide means B to support the belt in the roughly same state as a winding state of the drive pulley is provided on the opposite side on a line on which the drive mechanism A is arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt conveyor, and more particularly, to a linear belt conveyor having a simplified driving mechanism.

[0002]

2. Description of the Related Art As a driving method of a linear belt conveyor, there is generally a center drive method and a head drive method. In the former center drive system, and in the latter head drive system, the drive pulley of the drive unit is formed at least as long as or wider than the belt width,
Thereby, the drive pulley is configured to contact the entire width of the belt. Further, in the former center drive system, snap rollers for crimping and winding the belt around the outer peripheral surface of the drive pulley so that the belt is moved by the rotation of the drive pulley are arranged on both sides of the drive pulley. The snap roller is disposed outside the belt.

[0003]

However, in the above-mentioned center drive type belt conveyor, the outer surface of the belt, which is the conveying surface of the product, is rubbed by contact with the snap roller, and the outer surface of the belt is scratched and the appearance is impaired. Has problems. Furthermore, a method of driving the belt by pressing the outer peripheral surface of the belt against the outer peripheral surface of the drive pulley (for example, Japanese Patent Application Laid-Open
0016, Japanese Patent Application Laid-Open No. 10-258922, etc.), the above problem appears more remarkably. In addition, the belt is crimped around the outer peripheral surface of the drive pulley by the snap roller.
The angle is set to 0 degrees or more, and if an attempt is made to secure the form, the drive unit disposed below the frame becomes vertically long.
In particular, the relationship between the machine length (L1) and the belt width (L2) is L2.
In a mini-conveyor satisfying> L1, the meandering of the belt is more likely to occur, and in order to make the meandering of the belt less likely to occur, the vertical interval between the snap roller and the drive pulley in the driving unit is increased. ing. In this case, there is a problem that the drive unit is longer than the machine length (length in the vertical direction), the protruding portion below the frame is large, bulky, and the use range is restricted.

[0004] The present invention has been made in view of the above-mentioned problems of the prior art.
An object of the present invention is to provide a belt conveyor provided with a drive unit that does not cause abrasion at the center in the width direction of the outer surface of the belt. Another object of the present invention is to provide a belt conveyor having a small amount of protrusion of a drive section below a frame.

[0005]

In order to achieve the above object, the present invention provides a technical means in which tail rollers are rotatably supported via brackets on both left and right sides of a frame, and the tail rollers on both left and right sides thereof are provided. An endless belt is wound around the belt conveyor, and a belt conveyor equipped with a drive mechanism for running the belt between the right and left tail rollers with frictional engagement force, the drive mechanism is moved to one side in the width direction of the belt. A short cylindrical drive pulley disposed inside the belt; and a pinch roller disposed outside the belt that presses and presses the belt wound around the outer peripheral surface of the drive pulley onto the outer peripheral surface of the drive pulley. On the opposite side of the line on which the drive mechanism is arranged, a guide means for supporting the belt in substantially the same state as the wound state of the drive pulley is provided.

The driving mechanism is a so-called center drive system, in which one side in the width direction of the belt is a short cylindrical driving pulley disposed inside the belt, and a short cylindrical pinch roller is disposed outside the belt. And the belt is run by the rotation of the driving pulley. The drive motor of the drive pulley is disposed outside the frame, and the rotation of the motor is transmitted to the drive pulley through a gear mechanism or a well-known power transmission mechanism such as a chain and a sprocket or a toothed belt and a toothed pulley. It has become. Also, one pinch roller for pressing the belt against the outer peripheral surface of the driving pulley may be arranged on the center line of the driving pulley, or one pinch roller may be arranged on each side of the driving pulley. It is urged in the direction of pressing against the outer peripheral surface of the drive pulley. The member for urging the pinch roller toward the center of the drive pulley may be any member that generates an elastic force, such as a coil spring or a plate spring.

The guide means for supporting the other side in the width direction of the belt in substantially the same state as the wound state on the outer peripheral surface of the drive pulley is provided by freely attaching a short cylindrical roller having the same diameter as the drive pulley. The belt may be configured in any manner, for example, a flat plate member having good slipperiness may be bent into a mountain shape, or may be formed of a triangular member. To support the winding.

Further, in order to prevent the belt from meandering, a crosspiece having a substantially trapezoidal cross section (commonly called V sun) is welded and fixed to a substantially central portion in the width direction of the back surface of the belt along the longitudinal direction, and the front and rear frames are fixed. The crosspiece runs along the recesses of the trough and the right and left tail rollers that are integrally connected, the belt meandering adjustment by adjusting the inclination of the tail roller, or a part of the bracket that supports the tail roller is protruded, and the protrusion is formed. The belt may be provided with a structure for preventing the belt from meandering by abutting the side edges in the width direction of the belt. The form in which the protruding portion is formed on the bracket is a form in which all of the brackets on the left and right sides (four) are formed, a form in which the bracket is formed on the left or right side (one side) (two), or at least one pair of diagonal lines A form formed on the upper brackets (two), a form formed on the left and right brackets (two) opposed to each other on the upstream side or the downstream side in the running direction of the belt, and the like can be given.

According to the above-mentioned means, the belt wound around the tail rollers on both the left and right sides is pressed at one side in the width direction onto the outer peripheral surface of the short cylindrical drive pulley by the pinch roller, and the belt is wound. Since the other side in the width direction is supported by the narrow guide means similarly to the driving pulley side in the same manner as the winding state on the driving pulley side, the belt is driven and rotated stably. Since the driving pulley for driving the belt and the pinch roller are sandwiched only at one side of the belt width as described above, the rubbing trace of the pinch roller generated on the belt surface (conveying surface) is reduced. There is only one side in the width direction, and a clean belt surface can be maintained.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The drawing shows a straight conveyor in which the machine length (L1) is shorter than the belt width (L2).
Is a pair of front and rear frames, and the frames 1 and 1 ′ are aluminum extruded members formed with a concave groove a over the entire length in the longitudinal direction, in which a nut member for attaching various attachments can be mounted on the inner and outer surfaces and the lower surface. , The upper and lower frames 1 and 1 ′ are integrated frames connected by troughs 2. And a pair of frames 1, 1 '
A tail bracket 4 holding a tail roller 3 in a freely rotatable manner is connected and fixed to both left and right sides (longitudinal sides) of the tail bracket.

Support plates 5, 5 'are attached to the outer surfaces of the pair of front and rear frames 1, 1' so as to protrude downward from the lower surfaces of the frames 1, 1 '. The support plate 5 is provided with a driving mechanism A for rotating a belt 6 wound around the right and left tail rollers 3, 3, and the other support plate 5 ′ is provided in the width direction of the belt 6. Guide means B for supporting the side portion in a state substantially the same as the winding state on the drive mechanism A side is provided.

The drive mechanism A is arranged inside one end (right side in the drawing) of the endless belt 6 wound around the tail rollers 3 and 3 in the width direction. And a driving pulley 7 that contacts the driving pulley 7 and a belt 6 that is disposed outside the belt 6 that is wound around the outer peripheral surface of the driving pulley 7.
And a pinch roller 8 that presses against the outer peripheral surface of the drive pulley. Both the drive pulley 7 and the pinch roller 8 are formed in a short cylindrical shape, and only a predetermined width near one side in the width direction of the belt 6 is provided. The driving pulley 7 and the pinch roller 8 come into contact with each other.

The drive pulley 7 is provided with a non-slip member 7b on the outer peripheral surface of a pulley body 7a having a short cylindrical shape. The drive pulley 7 is fitted and fixed to one end of a support shaft 7c. The shaft 7c is rotatably supported by penetrating the support plate 5 and inserting and fixing it into a gear box 9 mounted on the outer surface of the support plate 5. The gear box 9 is mounted and fixed on the outer surface of the support plate 5 so as to be vertically adjustable, and the drive shaft 10 of the drive pulley 7 is rotated by a predetermined rotation by a drive motor 10 provided on the upper part of the gear box 9. It is possible to do.

The pinch roller 8 constituting the driving mechanism A is
On the outer side of a horizontally mounted support shaft 12 movably in the vertical direction with respect to shafts 13 and 13 ′ fixed to the upper surface of a mounting base plate 11 protruded horizontally inward from the lower portion of the support plate 5. The bearing shaft 12 is rotatably supported via a bearing, and the support shaft 12 is constantly urged by a spring 14 in a direction in which the outer peripheral surface of the pinch roller 8 is pressed against the drive pulley 7 side.
It should be noted that the illustrated pinch roller 8 is one, and is disposed so that the center thereof is located on the center line of the drive pulley 7. It may be arranged at a position.

The support plate 5 'on the opposite side of the drive mechanism A
Is formed by a short cylindrical roll 15 having substantially the same diameter as the outer diameter of the drive pulley 7 described above, and the roll 15 is vertically adjusted with respect to the support plate 5 '. It is rotatably supported by a support rod 16 that is freely attached via a bearing. The support rod 16 can be adjusted up and down by fitting the support rod 16 in a vertically extending guide hole 17 formed in the support plate 5 ′ so as to stop the support rod 16 from rotating and move vertically. And support plate 5 '
A fastening knob 18 is screwed onto a screw rod portion protruding outwardly of the support rod 16, the support rod 16 is fixed at a predetermined position by tightening the fastening knob 18, and the fastening knob 18 is loosened to support the support rod 16.
The (roll 15) can be moved up and down, so that the tension state of the belt 6 supported in the wound state can be adjusted to an optimum state.

The means for maintaining the wound state of the belt 6 in the optimal tension state is the same not only for the guide means B described above but also for the drive pulley 7 of the drive mechanism A. A guide slot 19 is formed in the mounting plate 9 'of the gear box 9 to which the support shaft 7c for supporting the shaft 7c is fixed, and a bolt 20 is formed in the support plate 5 through the guide slot 19.
It is tightened and fixed. Therefore, when adjusting the movement of the drive pulley 7 in the vertical direction, the bolt 20 is loosened so that the gear box 9 can be moved, and after the movement adjustment, the adjustment can be completed by tightening the bolt 20.

In order to prevent the belt 6 from meandering in the belt conveyor shown in the present embodiment, a bar 21 having a trapezoidal cross section is formed on the back side of the belt 6 over the entire length in the circumferential direction. A recess 22 to be fitted and guided is formed in the trough 2 and the tail rollers 3 on both the left and right sides.
Note that the meandering prevention of the belt 6 is not limited to the illustrated configuration. For example, the lower portion of the tail bracket 4 that supports the tail roller 3 is protruded downward to protrude the protruding portion 23.
May be formed so that the widthwise side end of the belt 6 on the return path side abuts the protruding portion 23, thereby preventing meandering. Needless to say, in this case, the crosspiece on the back surface of the belt and the concave portions of the trough and the tail roller are unnecessary.
Further, the mounting base plate 11 for supporting the pinch roller 8 in the driving mechanism A is a flat plate having a minimum necessary area.
The mounting base plate is a box for closing the space between the front and rear support plates 5, 5 ', and the box is attached to one of the support plates so as to be openable and closable with a hinge, and the other of the box is the other support plate. May be removable.

With the above construction, the belt 6 is wound and supported by a driving mechanism A comprising a short cylindrical driving pulley 7 and a pinch roller 8 with a predetermined width near one side in the width direction. The other side in the direction is supported by guide means B in the same winding state as the driving mechanism side, and the driving pulley 7 of the driving mechanism A
Is rotated by the drive motor 10, so that the belt is stably rotated. The pinch roller 8 of the driving mechanism for running the belt 6 contacts only one side in the width direction of the outer surface of the belt, and there is no contact with the other outer surface of the belt. , The surface of the belt can be kept cleaner compared to a conventional belt conveyor where the belt is rubbed. Further, since only one side in the width direction of the belt is sandwiched by pinch rollers having a short cylindrical shape, the belt can be easily pulled off by pulling it toward the guide means.

[0019]

According to the belt conveyer of the present invention, the abrasion generated on the outer surface (conveying surface) of the belt is only a predetermined width near one side in the width direction, and the other parts are not. There is no rubbing, so that a clean belt surface can be ensured over a long period of time. Since only one side in the width direction of the belt is pinched by the short-pinch pinch roller, the belt can be easily removed by pulling it toward the guide means. In addition, the belt winding state can be stably supported by the configuration according to the second aspect, and the running resistance can be reduced, so that smooth belt running can be ensured. Further, according to the configuration of the third aspect, the belt can be easily prevented from meandering without using a complicated configuration in which a crosspiece is formed on the back surface of the belt and a concave portion is formed in the trough and the tail roller. Therefore, the configuration of the belt, the tail roller, and the frame (trough) can be simplified, which can contribute to cost reduction.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of the same.

FIG. 3 is a right side view of the same.

FIG. 4 is a left side view of the same.

[Explanation of symbols]

 1, 1 'frame 3 tail roller 4 tail bracket 6 belt 7 drive pulley 8 pinch roller 23 projecting part A drive mechanism B guide means

Claims (3)

[Claims] 1. A tail roller is rotatably supported on both left and right sides of a frame via a bracket, an endless belt is wound around the left and right tail rollers, and the belt is interposed between the left and right tail rollers. Conveyor equipped with a drive mechanism that causes the drive mechanism to travel with frictional engagement force, the drive mechanism is moved to one side in the width direction of the belt, and is wound around a short cylindrical drive pulley disposed inside the belt and an outer peripheral surface of the drive pulley. A pinch roller disposed outside the belt that presses the belt to be pressed against the outer peripheral surface of the drive pulley, and further in a state substantially the same as the winding state of the drive pulley on a side opposite to the line on which the drive mechanism is disposed. A belt conveyor comprising guide means for supporting a belt. 2. The belt conveyor according to claim 1, wherein said guide means comprises a short cylindrical roller having the same diameter as the drive pulley, which is freely rotatable. 3. The belt conveyor according to claim 1, wherein the brackets on both the left and right sides are formed with a protruding portion with which a lateral end of the belt abuts.