JPS6347213A - Belt conveyer - Google Patents

Abstract

PURPOSE:To prevent cargo from dropping, by jointing endless belts which are axially bi-split and overlapped with each other at their centers, respectively to both ends of a cargo loading beds so that they run together with the loading belt. CONSTITUTION:An endless belt 12 is flexible and is divided widthwise into two right and left pieces, and is integrally incorporated from both widthwise ends of a cargo loading belt 11, and covers the upper surface of the cargo loading belt 11 in a natural condition while these pieces are overlapped with each other in the middle section thereof. The cover belt 12 is forced to open from the inside thereof by means of guide rollers in the vicinity of a tail pulley 2 and a head pulley 1 for a conveyer belt 10, and therefore, a material to be fed are fed and discharged, without making contact with the cover belt 12. After supply of the material, the latter is covered with the cover belt 12 by means of retainer rollers 4. Further, after discharge of the material, the cover belt 12 is reversed by means of a reversing device 6, and rides on the cargo loading belt 11 between return rollers 5. Then the cover belt 12 is reversed again by the reversing device to be returned to its original position. Accordingly, it is possible to effectively prevent dropping of cargo and generation of dust or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a belt conveyor, and in particular to a belt conveyor for transporting powder, granules or lumps such as ore, sand, coal, etc. .

A conventional belt conveyor has an endless belt-shaped loading belt stretched between a plurality of horizontal pulleys and driven to run, and objects to be transported are placed on the loading belt and supported by a plurality of carrier rollers.
VT is constructed for transport.

Therefore, the above-mentioned conveyor includes a flat belt conveyor in which the width direction of the loaded belt is supported by one horizontal roller, and a belt conveyor in which the belt is supported by two or more inclined rollers in addition to the horizontal roller so that the belt cross section is U-shaped or V-shaped. There is also a Tora 7 conveyor which is shaped like a letter, but both are open at the top and the objects to be transported are exposed.

There is also a cable conveyor in which both ends of the belt in the width direction are supported by cables running parallel to the belt, and these cables are supported by pulleys, but the upper part of the belt transport surface is also open, and the transported objects are exposed.

For this reason, the transported objects generate dust and spillage, which not only causes a decrease in yield, but also causes pollution. There were also problems such as getting wet during rainy weather.

In order to prevent these problems, a fixed cover is often installed to cover the top of the belt, but this is insufficient as a countermeasure because it is necessary to provide a gap between the fixed cover and the running belt. there were. Therefore, the second
A tube belt conveyor is used, as shown in FIGS. 6 and 27, in which the loading belt is forcibly bent to have a circular cross-section for transportation, and the upper part is sealed. However, since the belt 11 is greatly deformed in the belt conveyor, the belt is easily fatigued, and the running resistance of the carrier roller 3 increases, resulting in large power consumption. Also, compared to conventional belt conveyors, the carrier roller 3, suspension roller 40, and press roller 41 are
The transportation section holding device such as the above is large-scale and has poor economic efficiency, and furthermore, it is difficult to apply it to short distance S transportation. Furthermore,
The object to be transported is fed with the upper part of the belt open, and the object may be wrapped during traveling, or the cross section of the object may repeatedly fluctuate between the carrier rollers due to the elastic restoring force of the belt 11 and the weight of the object. There were drawbacks such as pulverization.

The present invention eliminates the above-mentioned problems and provides a belt conveyor that has simple grooves, reduces belt fatigue, does not cause dust, spillage, or pulverization of transported objects, and does not allow transported objects to get wet even in rainy weather. The purpose is to

Means for Solving the Problems The main parts of the means for achieving the above object are as follows. That is, in the transportation section of the belt conveyor, excluding the supply section and the discharge section, an endless cover belt is provided that covers the transported object on the loading belt from above in a natural state and runs together with the loading belt. . In the first invention (hereinafter referred to as the first invention), the cover belt is divided into two in the width direction, each of which is joined at both ends of the load belt in the width direction, and integrated with the load belt to perform the ITA. An endless belt is formed, and the two cover belts overlap with each other at medium heat in the width direction in the transportation section excluding the supply section and the discharge section.

In the second invention (hereinafter referred to as the second invention), the cover belt is formed as a one-ring endless belt independent of the loading belt, and in the transportation section excluding the supply section and the discharge section, The cover belt and the load belt are detachably engaged at both ends in the width direction.

Here, in this specification, h for winter shall be interpreted as follows. A loading belt is a belt whose purpose is exclusively to load objects to be transported, and whose upper part is open like the belts of well-known flat belt conveyors, tiger 7 belt conveyors, cable belt conveyors, etc. This refers to items that do not have the function of covering the transported items.

A transportation section is usually one section of the endless (circular) running section of the loading belt where the goods are loaded and transported on the loading belt, which is usually installed on the upper section and also on the lower section if necessary. It shall refer to two or more sections as necessary.

The supply section of the transportation section refers to the section from the start to the end of supply of the transported object, and the end point is the point where the cover belt that has been opened to supply the transported object is closed. In addition, the discharge section of the transportation section refers to the section from the start to the end of the discharge of the transported objects, starting from the point where the cover belt that was closed to discharge the transported objects is opened. . The natural state refers to a state in which no forcing force, such as a roller, is applied from the outside. That is, the cover belt covers the object to be transported on the loading belt mainly by its own weight and/or its elastic restoring force in the first invention, and mainly by its own weight in the second invention. Therefore, unlike the prior art shown in FIGS. 26 and 27, rollers for forcibly achieving sealing are not provided at all in the transportation section except for the supply section and the discharge section.

Operation The cover belt is opened, the object to be transported is placed on the loading belt, and the cover belt is overlapped from above the object by its own weight and/or elastic restoring force, and the object is conveyed in a closed state. When discharging the transported object, the cover belt is opened.

Example The present invention will be explained below based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of the first invention, in which an endless belt-shaped loading belt 11 is stretched between cylindrical pulleys 1 and 2 having a plurality of horizontal shafts, and is driven and run by a head pulley 1. A belt conveyor is shown in which the transported object Mf is placed on the loading belt 11 and transported. The above-mentioned load belt 11 is in contact with the transported object M in a transport section from the holding roller t, which is the end point of the supply section, to the holding roller 4, which is the foot point of the discharge section, and is in a natural state from above. A cover belt 12 is provided which runs simultaneously with the loading belt. According to this embodiment, the cover 12 is
As shown in Figures and Figure 4, it has flexibility and has two width directions: left and right.
Each cover 12 is divided into two pieces, and each cover 12 has a loading belt 11.
They are integrally formed from both ends in the width direction, and are formed so as to cover the upper surface of the loading belt 11 in a natural state and overlap each other at the intermediate portion thereof. That is, the load belt 11 bears the tension for supporting the amount of ffl of the transported object M and for running it. For this reason, this loading belt 11 has a large thickness as in the prior art, and a plurality of core bodies 15 such as steel cords are provided along the running direction as necessary. On the other hand, the cover 12 requires almost no reinforcing material, is thin, and has low rigidity.In this way, the conveyor belt 10 consisting of the loading belt 11 and the cover 12 is arranged between the pulleys 1 and 2 (in the middle). ), the horizontal roller 3a in the center and the rollers 2 provided on both sides thereof
A carrier roller 3 consisting of book inclined rollers 3b, 3b.
The transported object M is supported by r'+D on the load belt 11.
The transport cross section is configured to take on a U-shape when subjected to a load (Fig. 4).

Next, referring again to the ptS1 diagram, the conveyor belt 10
Near the tail pulley 2 of the transport object supply shoe) A,
Further, a chute B for discharging objects to be transported is provided in the vicinity of the head pulley 1, but it is necessary to open the cover 12 in order to supply and discharge objects to be transported at these parts. For this reason, as shown in FIG. 2, a guide roller 7 is provided with its axis generally oriented in the vertical direction so as to forcibly open the cover 12 from the inside. In order to close this cover again, the restoring force of the cover 12 is used when the restraint by the buidler luff is released, or the downstream side of the position where the restraint of the guide roller 7 is removed on the supply chute side. And on the discharge chute side, the cover 12 is placed from above on the upstream side where the restriction of the void rough starts.
A holding roller 4 is provided for holding down.

Further, it is necessary to pass the cover around the pulleys 1 and 2, especially around the outer periphery of the head pulley 1, with the cover intact.

This causes the ends of the cover 12 to widen. Therefore, cover 1
2 is provided with pleats along the longitudinal direction.

In a belt conveyor, the belt is usually supported by return rollers 5 at the subcontractor return section. In this return portion, the cover 12 may be located below the placing belt 11 and come into contact with the return roller 5, but it is preferable to provide a known belt reversing device 6 to reverse the belt 10. This prevents the cover 12 from being pinched and damaged by the roller 5 on the underside of the loading belt 11, making it possible to make the cover thinner, and not only reducing overall damage to the belt 10, but also preventing damage to the cover 12 on the return side. It is possible to transport objects according to the requirements.

Explain to the dog how the object M is transported on the belt conveyor.

The cover 12 is opened above the tail pulley 2 side by the restraint of the air flow, and the transported object M is placed in the supply shoe)
A is supplied onto the loading belt 11. The restraint of the void luff is released downstream from the supply position of the transported object M,
The cover belt is pressed from above by the holding roller 4, and the loading belt 11 from below forms a trough, and the transported object M is in a closed and covered state.After this, the transported object is closed in a natural state up to the discharge chute B. Sent wrapped. The cover 12 then reaches above the head pulley 1, where it is again separated by the guide roller 7, and in this state, the transported object M is thrown into the discharge chute B when moving to the return side. Tension is applied to the empty belt 10 by the take-up roller 8, the belt is reversed by the reversing device 6, the cover 12 is on the upper side, the belt 10 is supported by the return roller 5 made of a single cylindrical body, and then it is reversed again when it reaches the vicinity of the tail pulley 2. The cover 12 is placed on the lower side by the device 6, and the transported object M is placed thereon via the tail pulley 2.

FIG. 5 shows an embodiment of the pond of the discharge section of the first invention.

The head pulley 1 is normally a cylindrical body, but if it is made into a drum shape as shown in the figure to form a trough in this part, it will not be possible (the belt 10 is folded back and the cover 12 passes through the return roller 5). Since it is opened later, the folds at the tip of the cover can be omitted.

What is shown in FIG. 6 is an embodiment showing another embodiment of the discharge section of the first invention, in which the head pulley is made into a cylindrical body, and a plurality of outer return rollers are provided as I Afl, and the cover belt is connected to the head pulley. This is the thirteenth embodiment in which the arrangement is arranged so as to form a trough. In this case as well, if the cover 12 is opened after the belt 10 is completely folded back, the folds of the cover can be omitted, and the helad pulley can be shaped like a drum. There is no need to do this, so no strain is placed on the belt loading section.

In the PtS7 diagram, head pulley 1 is not used as a drive pulley,
This is an f54 embodiment of the first invention in which another drive pulley 15 is provided at a position where driving is applied after the transported object is completely discharged. According to this embodiment, even if the amount of transportation or the transportation distance is large and the winding angle of the drive pulley must be large, the winding angle of the head pulley 1 can be small, so the second
, @33 implementation, the belt can be folded back with the transported object loaded, and the folds of the cover can be omitted.

FIG. 8 shows a fifth embodiment of the bell) 10 of the first invention. According to this embodiment, the cover 12 is joined in a horizontal position outward from both ends of the loading belt 11 in a natural state. It is said to be bendable. Furthermore, in the head pulley 1 portion, the cover 12 is received by the long head pulley 1 (not shown) or another horizontal roller 3e, and is on the same plane as the loading belt 11. Therefore, it is not necessary to provide the cover 12 with pleats. In the middle part of the belt 10 of this embodiment, as shown in FIG. 9, there are a number of carrier rollers 3a+3b,
This is particularly effective when the length of the part of the cover over the loading part in the width direction is short, as in the case of forming a deep trough using 3c, 3d, . . . .

FIG. 10 shows a sixth embodiment of the first invention in which the base end portion of the cover 12 is perpendicular to the loading belt 11 in the natural state.
A seventeenth embodiment shown in FIG. 11 shows a state in which the cover 12 is rolled up at the heel pad 91 using a plurality of guide rollers 3r, 3g, and 3h.

Next, in the eighth embodiment of the first invention shown in FIG.
A thick wall portion 12a is provided along the length direction at the tip of the cover 2 to give rigidity to the tip, which has the advantage that once the cover is closed, it is difficult to open until it is forced open by a guide roller.

The core body may be inserted into the thick wall portion 12a, and rainwater can be prevented from entering by providing the thick wall portions so as to be offset in the cover thickness direction on the facing surfaces of the overlapping covers. Furthermore, if a plurality of protrusions 12a and grooves 12b are provided such that their tips engage with each other as in the ninth embodiment of the first invention shown in FIG. It becomes tight and maintains a sealed state.

! Figure 514 shows a tenth embodiment of the first invention in which the ends of the cover 12.12 form releasable zippers 12C. According to this embodiment, the double force bar has a strong engagement against the tensile force.

The eleventh embodiment of the first invention shown in FIG. 15 is a Pt511 embodiment in which a protrusion 12a at the tip of the cover is detachably engaged with a separately stretched cable wire 17. By applying tension to the wire 17, the cover 12 will not be opened accidentally.

The wire 17 is supported by another pulley and has an endless shape outside the transportation section.

In the twelfth embodiment of the first invention shown in FIG. 16, in addition to the return roller 5a, the protrusion 12a of the cover 12 is also provided on the return side pend roller 9, snap roller 34 (FIG. 1), etc.
FIG. 17 shows a first roller having seven run portions 5c supporting both ends of the load belt 11 instead of the grooved roller.
This is a thirteenth embodiment of the invention.

Next, FIG. 18 shows a first embodiment of the 12th invention.

In this embodiment, the cover 22 is integrated, and both ends in the belt width direction are removably engaged with both ends of the loading belt 21, and projecting portions 22a extend outward from both ends.

To engage with the loading belt 21, the fitting male portions 22b protruding outward from the lower surface of both ends of the cover 22 are connected to the loading belt 21.
It is made to engage with a hook protrusion 21a which is provided to protrude inwardly from the upper surface of the end portion of 1. In this case, since the back surface of the loading belt 21 is flat, the loading belt 21 and the cover 22
After being folded back by the Kaherado pulley, the return roller 5 can be left as a normal cylindrical roller by reversing the front and back sides of the assembled state using a known reversing device, and the cover 22 can be moved between the loaded belt 21 and the return roller 5. It won't get caught and hurt. The projecting portion 22a serves to block rainwater from above.

During transportation of the object M, the loading belt 21 forms a trough with the carrier rollers 3a, 3b, and 3b, so the engagement between the loading belt 21 and the cover 22 at both ends is strengthened, but on the return roller 5, Since the loading belt 21 becomes flat, the engagement between the two is released, and the cover 22 moves together with the loading belt 21 while remaining in the loaded position. Therefore, the tensile strength of the cover 22 is small, and a thin cover 22 is sufficient.

In the second embodiment of the second invention shown in Section 19, the upper surface of both Ra portions of the loading belt 21 has a hook portion 2 formed by a groove without a protrusion.
1b, and a male fitting portion 22b of the cover 22 is engaged with the groove. A reinforcing seat 21e having an inward hook portion is formed on the back side of the loading belt at the portion where the groove 21b is provided.

Therefore, the outer portion of the inclined carrier roller 3b that this reinforcing seat 21e comes into contact with is formed into a small diameter portion 3b'.

The combination of the small diameter portion 3b' and the reinforcing seat 21e helps prevent the loading belt 21 from meandering. In this embodiment the loading belt 21 is not reversed on the return side. cover 2
2 is inverted and placed on the loading belt 21. Therefore, since the hook portion 21b of the loading belt is formed as a groove and there is no protrusion, the return roller 5 may remain cylindrical. The reinforcing seat 21e also serves as an id of the cover 22 on the return side.

In the third embodiment of the second invention shown in FIG. 20, a protrusion 22c is used instead of the fitting part on the cover 22 side, and the protrusion 22c is inserted into a groove 21c provided on the pedestal at the end of the loading belt 21. The engagement means are shown inserted and pinched. According to this structure, the attachment between the two is strong, and the base provided with the groove 21c in the loading belt 21 serves to reinforce the belt.
Furthermore, since the protrusions that are easily damaged are provided on a cover that is inexpensive, it is economical to replace them in the event of damage.

Further, as the engagement means in the second invention, as in the fourth embodiment shown in FIG.
The cover 22 may be provided with a pedestal having a groove 22d.

In this case, since the grooves face downward, dust is less likely to remain in the grooves.

Fig. 22 is an overall front view of a belt conveyor showing a fifth embodiment of the second invention, and Fig. t523 is a perspective view of the main parts thereof. In the figure, in the vicinity of the tail pulley 2, the cover 22 is combined on the outside and the loading belt 21 is combined on the inside and folded back. Next, near the supply chute A, the cover 22 is separated from the loading belt 21 by a plurality of cover rollers 31 and pen rollers 32 provided above, and is configured to pass above it. A supply port to the supply chute is opened in the gap between these two, and the structure is such that the transported object M is dropped onto the load belt 21. Further, in this vicinity, the carrier roller 3 is arranged in a trough shape.
! 1 has been done. In the position where the supply of the objects to be transported M has ended, the cover 22 is engaged onto the loading belt 21 and moves together over the objects to be transported.

Thereafter, during the transport section up to the discharge section, the cover belt is not forcibly restrained by rollers or the like, and naturally seals the transported object. Then, at the ejection shoe (B) provided on the head pulley 1 side, pull the cover 22 away from the loading belt 21 and pull it upward in the same manner as above, and then move the cover 22 to the return side, avoiding the ejection chute B, until the drive pulley 30 and the cover It is moved independently by rollers 31. In addition, in this embodiment, the loading belt 21
Although another drive pulley 16 is also provided on the return side of the belt, the cover 22 is kept separated from the loading belt 21 until the driving by these pulleys 1 and 16 is completed. The discharge shoe) B has its discharge port inclined with respect to the belt running surface, and extends downward past the cover 22.

If it is necessary to discharge the conveyed material M that has climbed up to the tripper at the intermediate portion of the conveyor, it is done as shown by the two-dot chain line in FIG. 22. Discharge shoe) C has a cylindrical tripper pulley 18.
will be set up temporarily. And near this intermediate discharge shoe) C,
The cover 22 is also provided with a plurality of tripper rollers 33 to separate the cover from the loading belt 21 and pull it upward. The intermediate discharge chute C is inclined laterally with respect to the belt running surface because its discharge port avoids the lower return side belt. This method can be easily applied even when modifying an existing conveyor.

Since the cover 22 is assembled with the loading belt 21 and pulled, the driving pulley may be omitted.

Subsequently, in FIG. 22, the cover 22 is attached to the loading belt 21.
Here, the cover 22 is on the lower side and the loading belt 21 is on the upper side. Then, a reversing device 6 is installed on the downstream side, and the cover 22 and the loading belt 21 are reversed while being overlapped.

Therefore, in the downstream section, the loading bell 21 is supported by the return roller 5 with the cover 22 placed thereon. Next, a take-up pulley is provided. If cover 22 also requires take-up, both are actuated by separate pulleys 8 and 35, respectively, as shown. Then, before reaching the tail pulley 2 side, the loading belt 2
1 and the cover 22 are reversed by another reversing device 6 so that the cover 22 is on the lower side, and both are folded back to the carrier side via the tail pulley 2.

FIG. 24 shows a perspective view of a fifth embodiment of the second invention. According to this embodiment, only the cover 22 is connected to the cover reversing device 3b.
Anti-V: is done by. Moreover, this reversal takes place near the discharge chute B. Since the loading belt 21 remains as it is, the cover 22 bypasses the outside of the ejection shoe (B) and rests on the loading belt 21 at the same time as the cover 22 is turned over. Therefore, the ejection shoe)B
can be located within the belt running plane, which is convenient for the layout of the transportation route. Further, since only the cover 22 with low tension is reversed, a small size is sufficient for the reversal device.

In the sixth embodiment of the second invention shown in FIG.
The cover 22 is placed vertically in the width direction so as to avoid the supply chute A in the vicinity of the supply chute A where the supply shoe A is placed above the running surface. According to this embodiment, the input shaft of the transported object can be set within the running plane regardless of the reversal of the cover 22, and the layout becomes easy.

Effects of the Invention As described above, the present invention excludes the supply section and the discharge section (in the transportation section, it is equipped with an endless cover belt that covers the transported object on the loading belt from above in a natural state and runs together with the loading belt, In the first invention, the cover belt has two parts in the width direction.
The cover belt and the load belt are divided and joined to both ends of the load belt in the width direction so as to overlap each other at the center of the width direction, and in the second invention, the cover belt and the load belt are detachably engaged at both ends of the load belt in the width direction. Therefore, the following effects will be developed.

(a) Since the items to be transported are covered by the cover belt, the problems of air pollution and baggage during transportation are greatly reduced.

(b) Since the loading belt is not significantly deformed during transportation and the cover belt simply transfers its weight to the transported object, there is less destruction or pulverization of the transported object.

(e) The loading belt has no large deformation and is less fatigued.

(d) Equipment costs are low because no special support device such as a carrier roller is required for sealing.

(e) The load belt has almost the same structure as the open-top belt conveyor that has been widely used in the past, and there is almost no additional equipment required to install a cover belt, so it is not possible to modify the existing belt conveyor. It's easy.

(f) Since the transported items are covered with a cover belt, spillage of the items is suppressed;
The amount of 1trA can be increased, and the transport capacity can be increased.

(g) Since the cover belt suppresses the load slipping of the transported items, in the case of inclined transportation, a larger inclination angle can be obtained than a conventional top open belt conveyor, and as a result, a large lift can be obtained over a short distance.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the first invention, and FIG. 2 is a t
tS1 Figure 3 is a cross-sectional view in the width direction of the conveyor belt, Figure 4 is a cross-sectional view of important parts in the width direction of the conveyor, and Figure 5 is a cross-sectional view in the width direction of the second embodiment of the 1lQ1 invention. , 6th
The figure is a cross-sectional view in the width direction of the third embodiment of the first invention, and FIG.
FIG. 8 is a cross-sectional view in the width direction of the fifth embodiment of the first invention, FIG. 9 is a cross-sectional view in the width direction showing its operating mode, and FIG. FIG. 11 is a cross-sectional view in the width direction of the sixth embodiment of the invention, FIG. 11 is a cross-sectional view in the width direction of the seventh embodiment of the first invention, and FIG. 12 is a cross-sectional view in the width direction of the eighth embodiment of the first invention. @Figure 13 is the first invention! ￥S9 A cross-sectional view in the width direction of the embodiment, PjS14 is a perspective view of the cover of the tenth embodiment of the first invention seen diagonally from below, and FIG. 15 is a cross-sectional view in the width direction of the eleventh embodiment of the first invention. Fig. 16 is a widthwise sectional view of the twelfth embodiment of the first invention, Fig. 17 is a widthwise sectional view of the thirteenth embodiment of the first invention, and Fig. 18 is a widthwise sectional view of the first embodiment of the second invention. 19 is a cross-sectional view in the width direction of the second embodiment of the second invention, FIG. 20 is a cross-sectional view in the width direction of the main part of the j'l embodiment of the second invention, and FIG. invention ptS4
Fig. 122 is a front view of the entire conveyor of the fifth embodiment of the Pt52 invention, Fig. 23 is a perspective view of the main part of Fig. 122, and Fig. 24 is a cross-sectional view of the main part of the tPJ5 embodiment of the second invention. The perspective view, Figure 25! #2 A perspective view of the sixth embodiment of the invention,
FIGS. 26 and 27 are cross-sectional views in the width direction of the conventional structure. A... Supply chute, B... Discharge chute, M...
・Transported object, 1... Head pulley, 2... Tail pulley, 3... Carrier roller, 4... Holding roller,
5...Return roller, 6...Belt reversing device, 7
...Guide roller, 10.20...Conveyor belt, 11.21...Loading bell), 12.22...Cover belt Agent Patent attorney Strokazu Keiichi, Patent attorney Oshita Shinhira, attorney Patent Attorney Sekimon Mibuya Figure 5 Figure 6 Figure 7 Figure 12 Figure 13 Figure 14 Prisoner

Claims (20)

[Claims] (1) In the transportation section excluding the supply section and the discharge section, an endless cover belt is provided that covers the transported object on the loading belt from above in a natural state and runs together with the loading belt, and the cover belt is divided into two in the width direction. A belt conveyor characterized in that each of the belts is joined to both widthwise ends of a loading belt so as to overlap at a widthwise central portion. (2) In the transportation section excluding the supply section and the discharge section, an endless cover belt is provided that covers the transported object on the loading belt from above in a natural state and runs together with the loading belt, and the cover belt and the loading belt are arranged at both ends in the width direction. A belt conveyor characterized in that the belt conveyor is detachably engaged with the belt conveyor. (3) The belt conveyor according to claim 1, wherein the base end portion of the cover is provided in a posture such that the base end portion of the cover is tilted outward from both ends of the loading belt. (4) The belt conveyor according to claim 1, wherein the base end portion of the cover is provided in a posture such that the base end portion of the cover falls inward from both ends of the loading belt. (5) The belt conveyor according to claim 1, wherein the base end portions of the cover are provided from both ends of the loading belt in a direction perpendicular to the belt transport surface. (6) The belt conveyor according to claim 4 or 5, wherein the cover is provided with pleats along its length. (7) The belt conveyor according to claim 1, wherein a core body is provided along the length direction of the covers on opposing surfaces of the covers that overlap each other at the tips of the covers. (8) The belt conveyor according to claim 1, wherein a plurality of protrusions that mesh with each other are provided at the tip of the cover. (9) The belt conveyor according to claim 1, wherein a zipper is provided at the tip of the cover so as to engage with each other. (10) The belt conveyor according to claim 1, wherein the tip of the cover is removably engaged with a cable wire, and the cable wire is supported by another pulley outside the transportation section so as to be endless. (11) In the fourth aspect of the present invention, guide rollers are provided near the supply chute and the discharge chute of the conveyor, the shafts of which are oriented generally vertically so as to open the left and right covers from the inside.
The belt conveyor according to item 5 or item 5. (12) The belt conveyor according to claim 3, wherein the left and right covers are configured to open outward near the supply chute and the discharge chute of the conveyor. (13) The belt conveyor according to claim 1, wherein a cover holding roller is provided at the folded part of the belt so that the transported object is turned back with the loaded object, and a conveyed object discharge chute is provided downstream of the cover holding roller. (14) The belt conveyor according to claim 1 or 2, wherein the drive pulley is separate from the head pulley and is provided at a position where discharge of the transported object is completed. (15) The loading belt and the cover are engaged with each other by the fitting male parts located at both ends of the cover and the hook protrusions provided inwardly on the upper surface of the loading belt into which the fitting male parts fit. A belt conveyor according to claim 2. (16) The belt conveyor according to claim 2, wherein the loading belt and the cover are engaged with each other by forming a groove on one side and a protrusion that can fit into the groove on the other side. (17) The belt conveyor according to claim 2, wherein the projecting portion extends outward from the engaging portion of the cover with the loading belt. (18) The belt conveyor according to claim 2, wherein a cover is placed on the top surface of the loaded belt on the return side. (19) In the vicinity of the supply chute and/or the discharge chute of the transported object, the cover is supported by a special pulley and a gap is provided between the cover and the loading belt, and the cover enters the gap and is tilted obliquely to the belt running surface. 3. The belt conveyor according to claim 2, wherein the transported object is supplied or discharged by a supply chute and/or a discharge chute. (20) A reversing device is provided in the vicinity of the supply chute and/or the discharge chute of the transported object so as to vertically retract the cover from above the loading belt, and the supply chute and/or Alternatively, the belt conveyor according to claim 2 is provided with a discharge chute.