JP2002002939A - Belt conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt conveyor, foldable/developable as it is kept as a complete product. SOLUTION: The belt conveyor comprises an endless belt 3 wound over rollers 2, 2' arranged at both sides of a frame 1 in the longitudinal direction and a driving mechanism A mounted for rotationally moving the belt. The frame 1 is foldable/developable at a proper position in the longitudinal direction. A belt tension cancelling device B is provided between supporting portions of the rollers 2, 2' on the sides of the frame or the rollers at both sides so that the frame can be folded by the operation of the belt tension cancelling device in the state of the belt is wound.

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 belt conveyor equipped with a drive mechanism and capable of being folded while an endless belt is wound.

[0002]

2. Description of the Related Art A belt conveyor, which has been known from the past to today, has a long frame in which rollers are rotatably supported on both longitudinal sides thereof, and an endless belt is wound around the rollers on both sides thereof. And a drive mechanism for endlessly rotating the belt. As a driving mechanism for rotating the belt, two systems of a "center drive" system and a "head drive" system are employed.

[0003] In the former "center drive" system, a drive pulley driven by a motor is arranged on the return side of the belt, and snap rollers for bringing the belt into close contact pressure contact with the outer peripheral surface of the drive pulley are provided on the upstream and downstream sides of the drive pulley. In the configuration. Then, the drive pulley, the motor, and the snap roller are housed in a box to be unitized, whereby the drive mechanism can change the position between the tail rollers. In addition, as a form in which the belt is closely attached to the outer peripheral surface of the drive pulley,
A drive pulley is disposed between the outward and return sides of the belt, and the back surface opposite to the surface (transport surface) of the belt is brought into close contact with the lower outer peripheral surface of the drive pulley. A configuration in which the surface of the belt (conveying surface) is closely attached to the upper outer peripheral surface of the drive pulley is provided. In the latter "head drive" system, one of the rollers around which the belt is wound is used as a drive pulley. The drive pulley is driven by a motor or a motor roller having a motor built in the roller is used. In this case, it is impossible to change the position of the drive mechanism.

[0004]

However, the endless belt is held in a tensioned state in both of the above-mentioned "center drive" type and "head drive" type belt conveyors. It is impossible to reduce the size of the conveyor by folding the conveyor or to flip it up. For example, even if the frame to which the tail roller is attached is replaced by a single frame that can be folded in half, it is impossible at all to fold the conveyor small while the belt is wound. Therefore, when the conveyor is finished and the conveyor is cleared or moved to change the arrangement, it must be transported in the used state, and the place for installation must be as large as the installation area. In fact, they use it while feeling inconvenience in handling and storage.

In order to prevent bulkiness during transportation or the like, a support leg attached to the frame is detached from the frame, or a finished product is disassembled into constituent members. For example, a drive mechanism is separated from the frame and a belt is removed. Can be removed, but when starting to use again, the assembly and the relationship among the members must be adjusted to the same state as before disassembly, which is troublesome and extremely troublesome. In addition, when the parts are disassembled into pieces, there is a concern that parts will be lost.

[0006] The present invention has been made in view of the above-mentioned problems of the prior art.
It is an object of the present invention to provide a conveyor that can be folded / unfolded in a finished product state.

[0007]

In order to achieve the above object, the present invention provides a technical means in which a frame is configured to be foldable by connecting a plurality of frame members, and rollers are supported on both longitudinal sides of the frame. The endless belt is wound and a belt drive mechanism is provided, and a belt tension releasing device is provided between the roller support portion at the frame side end or the rollers on both sides, and the belt tension releasing device is operated by operating the belt tension releasing device. Loosen the belt so that the frame can be folded with the belt wound. Further, the plurality of frame members constituting the frame are freely connected / separable, and the separated frame member is slid up on the other frame member to be stacked. The frame members constituting the frame are connected by connecting at least two or more frame members, and the frame is folded in an outer folding type (alias: mountain fold) or a middle folding type (alias: valley fold). ), Or both folded forms may be combined to form a self-folding form. The support legs that support the conveyor horizontally are foldably attached to the frame, and when the support legs are folded, they are almost parallel to the folded frame. Can be supported. Further, the support legs may be separable from the frame.

The drive mechanism for driving the belt may be any of a "center drive" system and a "head drive" system, which are well known today as a belt conveyor driving system.
As a belt tension release mechanism for loosening the wound belt, a mechanism for moving a snap roller constituting a "center drive" system to separate the belt from the outer peripheral surface of the drive pulley, or a "center drive" system And a mechanism for moving the tail roller supported on the side of the frame in the “head drive” system from a position in the use state to a position inside the frame in the longitudinal direction.
In the "center drive" method, the type in which the belt is brought into close contact with the outer peripheral surface of the drive pulley is such that the drive pulley is arranged between the outward and return sides of the belt as described above, and the surface of the belt (transport surface) The drive pulley is arranged below the return side of the belt, and the surface (transport surface) of the belt is brought into close contact with the upper outer circumference of the drive pulley. Any format is acceptable.

As a structure for moving the position of the tail roller to the inside position in the longitudinal direction of the frame, the tail roller is rotatably supported on a short arm without directly attaching to the frame member, and the arm is mounted on the side of the frame member. The part is connected so as to be able to move up and down. Further, an arm supporting the tail roller may be slidably attached to the side of the frame member along the longitudinal direction thereof.

Therefore, the belt tension releasing device provided on the conveyor is a belt tension releasing device by moving a snap roller constituting the driving mechanism or a moving structure of a tail roller when the belt driving mechanism is a "center drive" system. Alternatively, both mechanisms may be provided in combination. Further, when the belt drive mechanism is of a “head drive” type, a structure in which the position of the tail roller is moved can be adopted. Further, the belt conveyor of the present invention includes, in addition to a general belt conveyor, a conveyor equipped with a net belt or a plastic belt.

According to the above means, a frame for supporting the tail roller on the side portion is constituted by connecting a plurality of members, and a belt tension releasing device for releasing the tension of the wound belt to loosen the belt is provided. Therefore, the frame can be folded by operating the belt tension release device to make the belt slack. That is, the conveyor can be compactly folded while the frame is equipped with the drive mechanism and the belt is wound. The folding of the conveyor not only reduces the bulk by compactly folding it, but also incorporates this folding conveyor into a part of the many conveyors constituting the line, and flips up a part of the frame member to be folded,
Alternatively, it can be hung down to form a path that goes back and forth between the inside and outside of the line.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIGS. 1 and 2 show a belt conveyor equipped with a center drive type as a driving mechanism. In the drawings, reference numeral 1 denotes a frame which can be folded in two. 2, 2 'are rotatably supported, and an endless belt 3 is wound around the tail rollers 2, 2'.
A drive mechanism A of a center drive type is arranged between 2 ′ and the belt 3 wound around the drive mechanism A.
A belt tension release device B for releasing tension of the frame 1 is provided, and support legs 5 and 5 'are connected to the frame 1 so as to be foldable.

The frame 1 is made of a mold made of aluminum and connected to the ends of the frame members 1a and 1b cut to about half the length of the machine to be formed.
6 'is fixed, the end faces of the frame members 1a and 1b on the side where the connecting plates 6 and 6' are mounted are abutted, and the connecting plates 6 and 6 'are rotatably connected to each other by a shaft 7. The connecting plates 6 and 6 'are provided with guide means 8 for restricting the rotational folding range of the frame members 1a and 1b. Also, the connecting plate 6 in the frame members 1a and 1b,
Tail rollers 2, 2 'are rotatably supported at the end opposite to the side to which 6' is attached via tail brackets 9, 9 ', respectively.

The guide means 8 is provided on one connecting plate 6 with the shaft 7
And a pin 8 fitted in the guide groove 8a fixed to the other connecting plate 6 '.
b when opened, the frame members 1a, 1
b are held in a straight line, and in a folded state, the frame members 1a and 1b are held substantially in parallel at predetermined intervals. The shaft 7 for rotatably connecting the connecting plates 6 and 6 'is formed of rivets, and the fixing of the connecting plates 6 and 6' to the frame members 1a and 1b is performed by using the shape member of the frame member. A nut is mounted in the groove, and a bolt is screwed into the nut from the outside of the connecting plate to tighten and fix. Further, the shaft 7 may be constituted by bolts and nuts. In this case, the shaft 7 is fastened via a collar.

The endless belt 3 wound around the tail rollers 2, 2 'is made of a synthetic resin material (for example, polyurethane, urethane, PVC) as a surface material on a cloth band generally used today. Etc.) or a non-stretchable flat band on which a rubber material is laminated, which is appropriately selected and used depending on the application.
As the belt 3, a net belt or a plastic belt can be used in addition to the above-mentioned flat belt.

The drive mechanism A includes a drive pulley 4a, snap rollers 4b and 4c arranged on the upstream and downstream sides of the drive pulley 4a, and a motor 4d with a speed reducer for driving the drive pulley 4a. These are laid across a pair of front and rear mounting plates 10 and 10 ′ that support the frame 1 so as to hang down on its return path, and the pair of front and rear mounting plates are in the longitudinal direction of the frame 1. It is unitized so that it can be moved and installed at any position along.

The details of the drive mechanism A will be described with reference to FIGS. 3 and 4. Bearings 11 and 11 'each having a bearing mounted at substantially the center of a pair of front and rear mounting plates 10 and 10' are provided. , The drive pulley 4a is horizontally supported, and one end of a support shaft of the drive pulley 4a penetrates the bearing part 11 and protrudes outward from the mounting plate 10. The protruding end has a toothed pulley 12a. Is attached and fixed.
Also, the mounting plate 1 on the side where the support shaft of the drive pulley 4a protrudes.
0, a motor 4d with a speed reducer for driving the drive pulley 4a is mounted, and the output shaft of the speed reducer of the motor 4d with the speed reducer is projected through the outside of the mounting plate, and a toothed pulley 13 is provided at the portion. A toothed belt 14 is hung over the toothed pulley 13 of the motor with a reduction gear and the toothed pulley 12 of the drive pulley 4a. Thus, when the motor 4d with a speed reducer is driven to rotate, its rotational force is transmitted to the drive pulley 4a via the toothed pulleys 12, 13 and the toothed belt 14, and the drive pulley 4a is driven and rotated at a predetermined rotation speed. You. The transmission means for transmitting the rotation of the motor with reduction gear 4d to the drive pulley 4a is not limited to the toothed pulley and the toothed belt, but is generally known as power transmission between two parallel shafts such as a sprocket and a chain. Means can be appropriately selected.

The intermediate portion of the back surface of the belt 3 on the return path is brought into contact with the drive pulley 4a over at least a range of approximately 180 ° of the lower outer peripheral surface. Snap rollers 4b and 4c are arranged on the upstream and downstream sides (on the left and right sides of the drive pulley in the drawing) of the belt running direction in 4a. The position where the snap rollers 4b and 4c are arranged is such that the axis thereof is above the axis of the drive pulley 4a.
In addition, as the distance between the axes of the snap rollers 4b and 4c is shorter, the range of the belt 3 in contact with the outer peripheral surface of the drive pulley 4a is closer to the entire circumference, and the frictional force with the belt 3 is larger. As a result, the driving force is reliably transmitted.

The snap rollers 4b and 4c are provided on the belt 3 located below the lower outer peripheral surface of the drive pulley 4a.
Is driven along the outer peripheral surface of the drive pulley 4a and brought into contact therewith. By adjusting the pressing / pulling of the snap rollers 4b and 4c against the belt 3, switching adjustment is performed.
The belt 3 can be in a tensioned state (belt driving state) or a slack state (frame foldable state).

Accordingly, the belt tension releasing device B provided in the drive mechanism A is a contact / separation swing mechanism for pressing / pulling the snap rollers 4b, 4c disposed on both right and left sides of the drive pulley 4a with respect to the belt 3. It is composed of The structure will be described below with reference to FIGS. 3 to 6.
A pair of left and right support arms 16,
One side portion (lower end portion) of the support arm 16 'is rotatably supported, and the snap rollers 4b, 4c are pivotally supported on the other side portion (tip portion) of the pair of support arms 16, 16'. . The support arms 16, 16 'are bent in a substantially arc shape,
The support shafts 17 and 1 of the snap rollers 4b and 4c are provided at the tip thereof.
A pair of front and rear snap rollers 4b and 4c are rotatably supported by protruding ends of support shafts 17 and 17 'projecting forward and backward from the support arm, respectively.

The support arms 16, 16 'are connected to the peripheral wall member 1
As shown in FIGS. 3 and 5, a pivotal support 18 having a substantially Ω-shaped cross section is integrally protruded from the lower end of the support arm. 15a is integrally formed with a bearing recess 19 into which the pivot body 18 is fitted. That is, the support arms 16 and 16 'and the peripheral wall member 15 use a mold material extruded into a cross-sectional shape as shown in the figure, and the support arms 16, 16' and the peripheral wall member 15 each use a long mold material in a predetermined shape. It is formed by cutting into width dimensions. Then, the pair of left and right peripheral wall members 15 described above,
15 'are disposed symmetrically at a distance substantially equal to the width of a cam to be described later, and both peripheral wall members 15, 15' are provided with a pair of support arms 16 which are fitted and pivotally supported by the members. , 16 'stop moving along the axial direction 2
The two plate-like stoppers 20 are bridged between the two peripheral wall members and are integrally connected by screwing to form a peripheral wall having a substantially inverted gate cross section.

The lower ends of the support arms 16 and 16 'rotatably supported by fitting the pivot support 18 into the support recesses 19 of the peripheral wall members 15 and 15' are in contact with cams. The portions 21 project from each other in the facing direction, and the cams 22 are rotatably disposed substantially directly below the two cam contact portions 21. The cam 22 is formed into an outer shape as shown in FIG. 4 using a synthetic resin material, and a support shaft 23 penetrates a predetermined portion of a side surface, and the support shaft 23 extends over the bottom members of the peripheral wall members 15 and 15 ′. The cam 22 is pivotally supported so as to be rotatable.

On the outer peripheral surface along the rotation direction of the cam 22, the two support arms 16,
A flat stop section 22a in which the cam contact portion 21 of 16 'abuts to stop the rotation of the cam 22, and both support arms 16, 1
When the cam 6 'is rotated in the direction of separating and fully opened, the cam contact portion 21 abuts and stops the rotation of the cam 22. They are formed at intervals of about 90 degrees in the direction. Further, a sliding surface 22b is formed between the two stop sections 22a and 22c to contact the lower surfaces of the two cam contact portions 21 of the support arms 16, 16 'when the cam 22 is rotated. I have.
An operation rod 2 for rotating the cam 22 is provided at a position substantially opposite to the sliding surface 22b on the outer peripheral surface of the cam 22.
A hole 25 into which the support shaft 4 is inserted is formed toward the axis of the support shaft 23.

The support arms 16 and 16 ', which are swung in the left and right directions by the rotation of the cam 22, have both support arms 1
A spring 26 for constantly biasing 6, 6 'in the closing direction is stretched. By changing the position at which the end of the spring 26 is engaged with the support arms 16 and 16 ', the urging force of the spring 26 can be adjusted. In the present embodiment, both snap rollers 4b, 4c
As a biasing means for applying a biasing force in a direction to bring them closer to each other, a method in which a spring is stretched between the two support arms 16 and 16 'is adopted, but this biasing means is limited to the above-described configuration. Instead, the belt is wrapped around the outer peripheral surface of the drive pulley, and the snap roller provided on the support arm is pressed against the outer peripheral surface of the belt, and an urging force acts to bring the two snap rollers closer to each other. Anything should do.

The positions of the frame members 1a, 1b constituting the frame 1 near the tail rollers 2, 2 'are as follows:
The support legs 5, 5 'are foldably connected. The configuration is such that guide plates 27, 27 'are fixed to the front and rear positions of the frame members 1a, 1b in a hanging manner.
7 ', leg mounting frames 28, 2 to which supporting legs 5, 5' are fixed.
8 'is rotatably / latably supported. That is, the leg attachment frames 28, 2 connected to the guide plates 27, 27 'are connected.
8 'is provided with a rotation center hole 29 for rotating a range of about 90 degrees from a position substantially perpendicular to the frame to a position substantially parallel to the frame, and about 1/4 for regulating the rotation range.
An arcuate guide groove 30 is provided. And guide groove 3
At both ends in the circumferential direction of 0, the pins 31 fixed to the leg mounting frames 28 and 28 'and fixed in the guide grooves 30 are latched at the end positions of the guide grooves, and are rotated in the opposite direction. Stop portions 32 and 32 ′ for stopping are continuously formed toward the rotation center hole 29.

The pins 3 are attached to the latching portions 32 and 32 '.
In order to move and insert the pin 31, the support shaft 33 for rotating the leg attachment frames 28 and 28 ′ also moves radially outward from the rotation center hole 29 along the radial outside of the pin 31. It is necessary to move a distance corresponding to the amount. For this purpose, grooves 34 and 34 ′ permitting the movement of the support shaft 33 are continuously formed around the rotation center hole 29 on a line connecting the center of the rotation center hole 29 and the centers of the latch portions 32 and 32 ′. Thus, it is formed in a substantially L-shaped front. The support shaft 33 is not fixed to the leg mounting frame 28 but is protruded from the inner surface of a contact plate 35 which abuts on the outer surface of the guide plate 27 as shown in the figure. , 28 ', but are not limited thereto.

Next, the folding operation (procedure) of the above-described belt conveyor will be described. (1) First, the pair of left and right snap rollers 4b and 4c of the drive mechanism A which is attached to the frame member 1b in the use state is separated from each other. In this operation, the operating rod 24 is inserted into the hole 25 of the cam 22 of the belt tension releasing device B, and the cam 22 is rotated. Snap rollers 4b, 4c
, The tension of the belt 3 is released, and the belt 3 is loosened. (See FIGS. 5 and 6.) (2) When the machine length of the conveyor is long, remove the return roller installed at an appropriate position of the frame 1. (If the return roller is not installed, this step is omitted.) (3) Remove the hook between the frame 1 and the support legs 5, 5 ', and attach the support legs 5, 5' to the frame 1. Rotate outward to make it foldable. (See FIG. 9) (4) With the support legs rotatable, holding the handles 36 attached to the front and rear side surfaces of the frame members 1a and 1b constituting the frame 1, the connecting portions of the frame members 1a and 1b The frame members 1a and 1b are lifted so as to protrude upward in a mountain shape so as to face each other. (5) By folding the frame, the support legs 5, 5 'are folded substantially parallel to the frame member inside the frame members 1a, 1b, and the support legs 5, 5' are connected to each other by the hook 37 to change the folded state. Secure. (See FIGS. 2 and 11)

In the above [First Embodiment], the folding type of the frame 1 is an external folding type (alias: mountain folding). However, the folding type of the frame 1 is not limited to the external folding type. It may be a folding type (alias: valley fold). In the following, assuming that the folding type is the [second embodiment], FIG.
This will be described with reference to FIGS. The driving method of the belt 3 is a center drive type, as in the first embodiment, and therefore, the description is omitted. In the case of the middle folding type, the connecting portion of the frame members 1a and 1b constituting the frame 1 moves downward on the vertical line from the horizontal position in the used state, and the side of the frame 1 provided with the tail rollers 2, 2 '. Since the ends are located on the opposite upper side, the support legs 5, 5 'provided on both sides of the frame 1 depend on the mounting position of the support legs and the length (height) of the support legs. In the case of folding and turning in the same direction as the direction shown in [First Embodiment],
Even when folded in the direction opposite to the direction shown in the [first embodiment], since the support legs 5 and 5 'cannot stand up and hold the link mechanism 38 separately over the frame members 1a and 1b. An auxiliary leg 5 ″ is provided.

FIG. 14 shows a frame 1 constructed by connecting four frame members, and shows a folding configuration of a conveyor equipped with a center drive type as a belt driving mechanism. The frame members are the above-mentioned outer folding type and middle folding type. It is folded in a zigzag form by combining expressions. This folding is effective for a conveyor having a long captain. The connection of the support legs to the frame, the drive mechanism, and the belt tension release device are the same as those in the above-described [First Embodiment], and thus description thereof will be omitted. When only the slack of the belt caused by operating the illustrated belt tension releasing device is not enough, a belt tension releasing device that moves a tail roller described later inward in the longitudinal direction may be combined.

[Third Embodiment] FIGS. 15 and 16 show the folding of a conveyor employing a [head drive] system as a belt driving system, and the frame members 1a and 1b constituting the frame 1 are folded outside. In the formula, the connection of the support legs 5, 5 'to the frame members 1a, 1b is the same as in the above [First Embodiment], and therefore the same members as those shown in the above embodiment are denoted by the same reference numerals, The description is omitted. In the head drive system for driving the belt 3, a motor roller 39 having a motor built in the roller is disposed on the side of the frame member 1a, and the tail roller 2 is supported on the side of the frame member 1b. 2 is provided with a belt tension release device B '.

The belt tension releasing device B 'rotatably supports the tail roller 2' on one side of a short arm 40 via a tension mechanism 41, and connects the other side of the arm 40 to the side of the frame member 1b. The belt 40 is configured to be rotatable up and down by a shaft 42, and the tension of the belt 3 can be released and slackened by rotating the arm 40 inward in the longitudinal direction (upward). Incidentally, as a structure for connecting and locking the arm 40 to the frame member 1b in a straight line,
As shown in the drawing, a structure in which an engagement recess 43 is formed in the arm 40 by notch, the engagement recess 43 is fitted to the shaft 44 of the frame member 1b, and the knob 45 screwed coaxially is fixed. Is simple.

FIG. 17 shows another example of a belt tension releasing device for moving the tail roller 2 'inward in the longitudinal direction of the frame 1 to loosen the belt 3, and (a) shows a short belt supporting the tail roller 2'. Arm 46 of the frame member 1b
Are connected by a parallel link 47, and the parallel link 4
7 is equipped with latch means. (B) shows a short arm 48 supporting the tail roller 2 'connected to the side of the frame member 1b so as to be slidable in the longitudinal direction.

In each of the embodiments described above, the frame constituting the conveyor is folded. However, the structure in which the frame according to the present invention can be folded is not only made compact by folding the frame, but also as shown in FIG. A folding belt conveyor is arranged on a part of the built-in conveyor, the belt tension release device is operated to make the belt slack, one of them is fixed, and the other frame member is flipped up. By fixing the jumped-up frame member to a horizontal fixed frame member with a hook or the like so as not to fall down, it is possible to easily secure a passage that moves between the inside and the outside of the line. In the drawing, one of the frame members to be folded is fixed and the other is flipped up, but one of the frame members is fixed, and the other frame member is hung downward to secure a passage. This may be done.

FIG. 19 is a view showing an embodiment corresponding to claim 6, wherein the frame 49 comprises two frame members 49a,
49b is connected or separated in a horizontal straight line by a connecting means 51 such as a bolt via a receiving plate 50 attached to the connection end side of the frame member 49b. By operating the center drive type driving mechanism A attached to the frame member 49b and the belt tension releasing device B in the belt tension releasing device B, the frame member 49a is operated.
And tail rollers 52,5 attached to the ends of 49b
The belt 53 wound around 2 'is configured to be slack. Therefore, after operating the belt tension releasing device B to make the belt 53 slack, the connecting means of the frame members 49a and 49b is disconnected to separate them, and the separated one frame member 49a is replaced with the other frame member 49b. And between the belt 53 and the outward side, and can be slid over the frame member 49b and horizontally overlapped, thereby shortening a range equivalent to the length of the substantially frame member 49a, and Can be secured. According to this embodiment, there is no need to fold the support legs, and the connecting means of the frame member can be configured simply and inexpensively as compared with the above-described embodiment.
Cost reduction can be measured.

[0035]

According to the belt conveyor of the present invention,
According to the configuration described in 5, since the belt tension is released by operating the belt tension release device and the belt can be loosened, a plurality of frames can be kept in a finished product without removing the drive mechanism or the belt. The frame formed by connecting the members can be compactly folded by an external folding type, a middle folding type, or a combination of both types. Since the frame can be folded, the conveyor is incorporated into the production line, and a part of the frame member to be folded is flipped up or down, so that a passage connecting the inside and outside of the line can be easily secured. It can also be used as a mobile work table of the cell production system. Further, according to the configuration of the second and third aspects, the tension release of the belt and the return to the tension state can be performed with one touch, and the folding and unfolding (assembly) can be easily performed. Furthermore, according to the configuration of the fourth aspect, the folded conveyor can be held upright by the support legs in a substantially vertical state, which is convenient for storage. According to the configuration of the sixth aspect, the length of the machine can be easily reduced (shortened), and therefore, a passage connecting the inside and outside of the line can be easily secured.

[Brief description of the drawings]

FIG. 1 is a front view showing an example (first example) of an embodiment of a belt conveyor according to the present invention.

FIG. 2 is a partially cutaway front view of the conveyor in a folded state.

FIG. 3 is a partially cutaway front view showing a drive mechanism and a belt tension release device provided on the conveyor.

FIG. 4 is a vertical sectional side view of the same.

FIG. 5 is a partially cutaway front view showing a state where the belt is released by operating the belt tension release device.

FIG. 6 is a sectional view taken along the line (6)-(6) of FIG.

FIG. 7 is an enlarged front view showing a connection structure of a frame member and a connection structure of a support leg to the frame member.

FIG. 8 is an exploded perspective view of the same part.

FIG. 9 is a front view showing a state where the frame member has begun to be folded after the tension of the belt is released.

FIG. 10 is a front view of the frame member and the supporting legs in the process of being folded.

FIG. 11 is a front view showing a state in which the folding mechanism for folding the supporting leg is completely folded and latched.

FIG. 12 is a front view showing a folding center type conveyor.

FIG. 13 is a front view of the folded state.

FIG. 14 is a front view showing a self-folding folding mode.

FIG. 15 is a front view showing a belt tension release device in a head drive type conveyor.

FIG. 16 is a front view showing the folded state.

FIGS. 17A and 17B show another example of a belt tension releasing device by moving a tail roller, wherein FIG. 17A shows a moving mechanism using a parallel link, and FIG. 17B shows a moving mechanism using a slide.

FIG. 18 is a front view showing an example of use of the folding conveyor.

FIG. 19 is a front view showing another example of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Frame 2, 2 '... Tail roller 3 ... Belt 4a ... Drive pulley 4b, 4c ... Snap roller 4d ... Motor with reduction gear 5, 5' ... Support leg A ... Drive mechanism B ... Belt tension release device

Claims (6)

[Claims] An endless belt is wound around rollers arranged on both sides in the longitudinal direction of a frame, and a belt conveyor provided with a drive mechanism for rotating the belt,
The frame is foldable / unfoldable at a substantially middle portion in the longitudinal direction, and a belt tension releasing device is provided between the rollers on both sides of the frame or between the rollers on both sides of the frame, and the belt is released by operating the belt tension releasing device. A belt conveyor characterized in that the frame can be folded in a mounted state. 2. A drive pulley disposed between rollers on both sides of a frame, and a snap roller disposed on an upstream side and a downstream side of the pulley for bringing the belt in a close contact pressure contact with an outer peripheral surface of the drive pulley. 2. The belt conveyor according to claim 1, wherein the belt tension releasing device is a center roller type driving mechanism comprising a snap roller contact / separation swing mechanism. 3. The driving mechanism according to claim 1, wherein one of the rollers supported on both sides of the frame is a head drive type driving mechanism including a drive pulley driven by a motor or a motor roller having a motor built therein. The belt conveyor according to claim 1, wherein the tension release device is configured to support a roller supported on the other side of the frame on a movable arm that can move inward in the longitudinal direction of the frame from a position in use. 4. The belt conveyor according to claim 1, wherein support legs are attached to both sides of the frame in the longitudinal direction so as to be rotatable with respect to the frame. 5. A frame is configured to be freely foldable at a substantially middle position in a longitudinal direction, a tail roller is attached to both sides in a longitudinal direction of the frame, and an endless belt is wound around the tail roller. A drive pulley driven by a motor is provided on one of the frames to be folded in two, and a snap roller that closely presses the return path side of the belt against the lower outer peripheral surface of the drive pulley is provided upstream and downstream of the drive pulley. Snap rollers on the upstream and downstream sides further support the return path side of the belt so as to be able to switch between pressure contact and separation with respect to the lower outer peripheral surface of the drive pulley, and support legs are rotated on both sides of the frame. A belt conveyor that can be connected freely. 6. A belt conveyor provided with an endless belt wound around rollers arranged on both sides in the longitudinal direction of a frame and equipped with a drive mechanism for rotating the belt,
The frame can be divided and connected freely at an appropriate position in the longitudinal direction, and a belt tension releasing device is provided between the rollers on the side of the frame or between the rollers on both sides, and the belt is wound by operating the belt tension releasing device. A belt conveyor characterized in that the divided frames can be stacked freely in a state in which the belts are separated.