KR100307945B1 - Actuator of small belt conveyor - Google Patents

Abstract

The belt drive device of the present invention installs the pulley 21 at the front end and the tail pulley 21 at the front end of the left and right frames 5 and 15, which are connected to each other by the slide bed 16 between the upper end portions. In the lower part of the frame, the drive unit 12 of the belt is detachably installed. The side belt returning to the lower part of the frame at the position of the drive unit at the same time as the drive pulley 30 is disposed in contact with the outer surface of the side belt supported by the frame body 31 with the rubber spring in the drive unit 12. Inner pulleys (23, 24) in contact with the inner surface of the installation is installed.

The driving pulley 30 is always pressed to the inner pulley side by a rubber spring, and at the same time, the belt fitted to the inner pulley and the driving pulley 30 is frictionally driven by pressing from the outside of the belt of the driving pulley. The take-up device is omitted by pushing the drive pulley to the belt side.

Description

Driving device of small belt conveyor

1 is a side view of a first embodiment of a drive device of the present invention.

2 is a cross sectional front view taken along the line A-A of FIG.

FIG. 3 is a side view of the drive unit removed from the conveyor frame of the drive device shown in FIG. 1; FIG.

4 is a bottom view of the drive unit lifted from the frame.

5 is a cross-sectional front view of FIG.

6 is a side view of the drive unit in the second embodiment;

7 is a cross sectional front view of FIG.

FIG. 8 is a side view of the drive unit lifted from the frame in FIG. 6; FIG.

9 is a side view of a drive unit in a third embodiment;

10 is a side view of a drive unit in a fourth embodiment.

11 is a skeletal side view of the first to third embodiments.

12 is a skeletal side view of the fourth embodiment.

13 is a skeletal side view of the fifth embodiment.

14 is a skeletal side view of the sixth embodiment.

Fig. 15 shows the drive part of the belt conveyor in the seventh embodiment, wherein (a) is a plan view of the pressing means with the frame portion removed, (b) is a side view thereof, and (c) is a side view of the pressing means.

FIG. 16 shows a drive part of the belt conveyor in the eighth embodiment, (a) is a plan view of the pressing means with the frame portion removed, (b) is a side view thereof, (c) is a side view of the pressing means, and ,

FIG. 17 shows the drive unit of the belt conveyor in the ninth embodiment, (a) is a plan view of the pressing means with the frame portion removed, (b) is a side view thereof, and (c) is a side view of the pressing means.

* Explanation of symbols for main parts of the drawings

10: belt conveyor 11: leg unit

12,76: drive unit 14: screw

15 frame 16: slide bed

17: concave groove 18,19: T groove of the frame

20: endless belt 20a: convex slip on the back of the endless belt

21: head pulley (head belt holding member)

22: tail pulley (tail belt holding member)

23,24,71,72,82,83: inner pulley 25,27,91,92: pulley member

26: push pulley 28: bearing bracket

30,77: drive pulley 31: support frame

31a: screw through hole 32: rocking frame body

33: pressing means 33a: rubber spring

34, 34a: rubber spring support part 35: inner cell

36: outer cell 37: cylindrical lamp body

38: metal fittings with inner cell 39: flange

40: stopper bolt 41,78: motor with reducer

42: output shaft 43: recessed groove of the drive pulley

44: friction surface of the driving pulley 45: motor

46: gear box 47: axis of rotation

48: drive pulley 50: motor with reducer

51: chain 52,53: sprocket

55: driving pulley 57,58: catch clip

60, 93: leaf spring (spring member) 73: plate

75: support frame 81: compression coil spring

85,86 Information Bar 87,88 Socket

89: U-shaped groove 90: York

[TECHNICAL FIELD OF THE INVENTION]

The present invention relates to a drive device for a small belt conveyor in which the belt fitted with the inner pulley and the drive pulley is friction driven by the drive pulley.

[Background of invention]

The small belt conveyor that drives the endless belt by sliding it on the slide bed is used in various ways for conveying small tools and scattered objects, but conventionally, the belt is wound around the driving pulley and generates belt tension. Since the conveying torque is significantly reduced when the elongation of the belt is increased, it is necessary to install a take-up device to apply tension.

On the other hand, when used as a feeder conveyor around a food or medicine related manufacturing machine, the conveying surface and its surroundings must be kept clean at all times, and when contamination occurs on the conveying surface or the like, it is frequently cleaned or periodically cleaned. However, even if the surface of the belt is wiped and cleaned, the cleaning and scavenging of the back surface of the belt or the roller circumference cannot be performed completely unless the belt is removed from the frame or the roller.

Since this type of conveyor is always sliding on the slide bed, the belt is badly damaged and the transfer belt needs to be replaced. When replacing the conveying belt, it is necessary to remove the frame with the roller from the frame or to remove the main roller such as the leading roller from the frame. For this reason, Japanese Utility Model Publication No. 5-24652 discloses that a hinge is provided on one side of the frame so that the frame can be freely opened and closed, the frame is closed, normal transfer is performed, and the belt can be released when opened upward. It is.

In the above Utility Model Publication, the belt is driven by the tension around the drive pulley. When the elongation of the belt is increased, the conveying torque is significantly lowered. Therefore, it is necessary to install a take-up device to apply tension to the belt. The belt must be damaged quickly and the belt must be replaced frequently.

[Overview of invention]

An object of the present invention is to provide a drive of a small belt conveyor without the need for a take-up device. It is also an object of the present invention to provide a drive device capable of driving a belt by pressing a drive pulley or an inner pulley against the belt side and sandwiching the belt between the rollers.

In order to achieve the above object, the present invention provides a frame for driving a small belt conveyor; A belt holding member mounted at the front and rear ends of the frame; An endless belt disposed between the belt holding members; A belt drive unit provided with a detachable free passage at a predetermined position under the frame, the belt drive unit having a drive pulley in contact with the outer surface of the belt on the return side of the endless build and a motor with a reducer for driving the drive pulley; At least one inner pulley in contact with an inner surface of a return side belt installed under the frame corresponding to the attachment position of the drive unit; It is composed of a pressing means elastically disposed between the inner pulley and the driving pulley to press the belt fitted in both pulleys from the driving pulley side to the inner pulley or from the inner pulley side to the driving pulley. The head belt holding member and the tail belt holding member may be fixed to the frame end, or may be a non-rotating belt sliding guide provided detachably, a roller supported at the end of the frame, or a pulley detachably provided. The frame is connected by a slide bed between the upper end portions of the left and right frame members, but a plurality of carrier rollers may be arranged at intervals between the opposing left and right frame members.

In addition, a small belt conveyor is provided on the upper part of the drive unit with screws or catch clips freely attached to the frame, and a belt belt holding member and a tail belt holding member are installed at the front and rear of the frame. as; At least one inner side in contact with the inner surface of the side belt returning to the lower part of the frame at the drive unit attachment position, while arranging a driving pulley in contact with the outer surface of the side belt supported by the frame body with a spring member attached to the drive unit. Install pulleys; The driving pulley is pressed against the inner pulley by a spring member, and at the same time, the belt fitted into the inner pulley and the driving pulley is frictionally driven by pressing from the outside of the belt of the driving pulley.

The spring member is a leaf spring on which one side is fixed to the support frame of the drive unit, and the other side is the free end side, on which a motor and a driving pulley are mounted.

Furthermore, as a small belt conveyor which arrange | positions a frame freely in the upper part of a drive unit, installs a head pulley and a tail pulley before and after a frame, and places an endless belt; At least one driving pulley in contact with the outer surface of the side belt supported by the swinging frame body with a rubber spring attached to the driving unit, and at least one contacting the inner surface of the side belt returning to the lower part of the frame at the position of the driving unit device. Installing an inner pulley; The driving pulley is pressed against the inner pulley by a rubber spring, and at the same time, the belt fitted into the inner pulley and the driving pulley is frictionally driven by pressing from the outside of the belt of the driving pulley.

The driving pulley is always pushed upward by the rubber spring, and the upward angle is adjusted with the stopper bolt.

The rubber spring is made of metal and consists of an inner and outer cell of cylindrical shape and a cylindrical rubber body. The inner cell is inserted concentrically into the outer cell with a displacement of 45 °, and the corners of the inner cell and the outer cell corners A plurality of rubber bodies are pressed in between. The spring characteristic is non-linear and the cylindrical rubber body is rolled and compressed. Therefore, it transmits the rocking motion reliably and simultaneously absorbs vibration and noise. It has abundant elasticity, few permanent deformations, strong impact load and excellent durability. The torsion angle can tolerate up to ± 30 ° and the torsional stiffness increases with increasing load. The internal friction of the rubber body is more than 1000 times higher than that of metal such as spring steel, so that it is possible to prematurely stop the vibration accompanied by the amplitude decrease or impact during resonance.

The belt holding member, the carrier roller, the inner pulley, the driving pulley and the slide bed has a concave groove in the center, and correspondingly in the center of the rear length direction of the endless belt can be engaged with the concave groove to prevent zigzag of the belt. Although convex slip is provided, these recessed grooves and convex slip are not necessarily required.

The separate type of drive unit attaches the motor and gearbox in the longitudinal axis direction of the rocking frame body, protrudes the rotation shaft on the left and right sides of the gearbox to secure the drive pulley, and at the same time, the T groove and the drive unit on the side of the frame. Several sets of catch clips provided with springs and engaging foams are provided between the side plates of the frame and the drive unit is detachable.

More. A motor with a reducer and a drive pulley are installed in the support frame of the drive unit, and the chain is connected to the sprocket of the output shaft of the motor with the reducer and the sprocket installed on the drive pulley shaft, and the inner pulley and the frame are pressed in the frame of the drive unit. At the same time as the pulley is installed, the inner pulley is disposed on the lower inclined portion of the driving pulley so that the belt is wound around the circumferential surface of the driving pulley about 135 °, and in order to press the driving pulley from the outside of the belt, The frame and the drive unit may be detachably assembled by attaching a catch clip inclined about 45 "with respect to a vertical line including the axis of the drive pulley between the side plates of the support frame.

In addition, one inner pulley may be provided at approximately the center of the lower side of the frame, and the belt may be interposed between the inner pulley and the driving pulley in the driving unit, or the belt may be interposed between the pulley at the rear end of the frame and the driving pulley in the driving unit. good.

Since the above configuration, the belt sandwiched between the inner pulley and the driving pulley is frictionally driven by the pressing from the outside of the belt of the driving pulley. In addition, the screw that has fastened the drive unit and the frame was tightened to remove the drive unit and the frame. By removing the belt, the belt is loosened, the belt is removed from the frame, the front and rear surfaces of the belt are cleaned, and the required parts of the frame and the driving unit are cleaned or repaired. Reassemble and use again. The driving pulley is press-contacted to the inner pulley side by a rubber spring, and frictionally drives the outer side of the belt so that take-up is unnecessary and the structure is simplified.

Detailed Description of the Preferred Embodiments

Next, the present invention will be described in detail with reference to the drawings. 1 to 5 show a first embodiment of the small belt conveyor drive device of the present invention, in which FIG. 1 is a side view of the same driving device, and FIG. 2 is a transverse front view on line A-A of FIG. (Overall structure) As shown, the drive unit 12 is fixed to the leg unit 1 using the screw 13, and the frame 15 is arrange | positioned freely at the upper part. At the front part of the frame 15, the headbelt holding member (or head pulley) 21 is installed at the rear part, and the tail belt holding member (or tail pulley) 22 is installed at the rear part, and the endless belt 20 is provided between both belt holding members. Place and configure the small belt conveyor (10). The leg unit 11 is not limited to the thing of the shape of illustration. In addition, an auxiliary leg unit (not shown) which supports the frame in cooperation with the leg unit 11 may be provided in the frame 15 at a position away from the driving unit 12.

The head belt holding member 21 and the tail belt holding member 22 fixed to the end of the frame have a pulley shape as shown, but are provided to be detachably provided to a notch or a groove (not shown) installed inside the frame. The non-rotating sliding guide may be replaced.

As shown in the cross section in FIG. 2, the frame 15 has T grooves 18 and 19 on the side surfaces and the bottom surface, and the slide bed 16 is integrally formed between the frame bodies on both sides. Inner drive pulleys 23 and 24 in contact with the inner surface of the return side belt are arranged in the drive unit area of the lower part of the frame. These inner pulleys 23 and 24 are fixed using bearing brackets 28 mounted on the T grooves 19 on the lower surface of the frame. Although the frame 15 shown in the figure is connected between the upper end portions of the left and right frame members by the slide bed 16, a plurality of carrier rollers (not shown) may be arranged at intervals between the opposing left and right frame members. .

The drive pulley 30 is arranged in contact with the outer surface of the belt on the return side within the drive unit 12. The driving pulley 30 is always pressed to the inner pulley side by the rubber spring 33 described later. The belt 20 fitted at the same time with the belt 20 interposed between the inner pulleys 23 and 24 and the driving pulley 30 is frictionally driven by pressing from the outside of the belt of the driving pulley.

The drive unit 12 includes a drive pulley 30, a support frame 31, a rocking frame body 32, and a rubber spring 33a. It consists of the pushing means 33 like the leaf spring 60 (shown in FIG. 9 later), and the motor 41 with a deceleration mechanism.

The support frame 31 is formed of the plate 31c provided in the corner part of the left and right side board 31a, the joint plate 31b, and the both side board 31a (FIG. 4). Each plate 31c has a through hole 31d of the screw 14 in order to bring the drive unit 12 into contact with the frame 15. In addition, the support frame 31 is provided with a swing frame body 32 which is always pressurized upward by the torsional torque of the rubber spring 33a as described later, and the motor 41 with a reducer is attached to the swing frame body 32. ) And the drive pulley 30 fixed to the output shaft 42 of the motor 41 are attached. The driving pulley 30 has a concave groove 43 engaged with the convex slip 20a on the belt back at the center of the circumferential surface, and the friction surfaces 44 and 44 formed by urethane resin bonding and the like are formed on the left and right sides thereof. 11 is a skeletal side view of the first embodiment.

The rubber spring (spring member) 33a has four cylindrical rubber bodies between the inner and outer cells 35 and 36 made of woven metal having a shift of 45 ° in the rotating surface including the shaft center of the outer cell 36 ( 37) by press fitting. Its spring characteristics are nonlinear, and when the torsional force is applied to the inner and outer cells, the cylindrical rubber body 37 is rolled and compressed. Therefore, when the inner cell 35 is fixed and the outer cell 36 is left free, the swinging motion is reliably transmitted, and at the same time, vibration and noise are absorbed. It is rich in elasticity, has little permanent deformation, is strong against impact loads and has excellent durability.

As a spring characteristic of this rubber spring 33a, the torsion angle can tolerate up to ± 30 °, and the torsional rigidity increases with increasing load. The torque characteristic is determined by the length of the inner and outer cells and the cylindrical rubber body. In addition, as a damping characteristic, the internal friction of the rubber body is 1000 times higher than that of metals such as spring steel, so that the vibration can be stopped early due to the amplitude reduction or impact during resonance.

The swinging frame body 32 is supported by the rubber spring 33a as described above. That is, both ends of the inner seal 35 of the rubber spring 33a are fixed to the side plates 31a and 31a of the drive unit 12 between the mounting brackets 38, and the outer cell 36 is a swinging frame body ( It is held by the bending member 34 formed in 32 and the member 34a facing the corresponding member 34. The ends of the cuff portion 34 and the cuff member 34a are extended to form a flange 39, and the stopper bolts 40, which are standing upright on the joint plate 31b side, are brought into contact with each other. The stopper bolt 40 regulates the upper limit angle of the swinging frame body 32, and at the time of assembling the frame 15 and the drive unit 12, the excess of the drive pulley 30 supported by the swinging frame body is maintained. Press uprights to facilitate assembly work.

The driving pulley 30 and the pulleys 23 and 24 have concave grooves 43, 23a and 24a on the circumferential surface of the pulley center, and correspondingly the concave groove on the pulley side in the longitudinal center of the rear surface of the endless belt 20. It is provided with the convex slip 20a which can fit in and prevents zigzag of a belt. Further, the belt holding members 21 and 22, the carrier rollers, and the like are formed in the center, but when the zigzag of the belt is small, these recessed grooves and convex slips may not be necessary.

(Operation) The operation of the conveyor will be described. Since the belt 20 fitted into the inner pulleys 23 and 24 and the driving pulley 30 is frictionally driven at a predetermined torque by the pressing from the outside of the belt of the driving pulley 30, the conveyed object on the belt is removed from FIG. Transfer in the direction of the arrow.

In the conventional method of pushing and driving the belt 20 toward the driving pulley side, a take-up device is required because of the belt tension. However, the installation of the take-up device can be omitted by pushing the driving pulley 30 to the belt side. .

The drive unit 12 and the frame 15 can be detached by removing the screw 14 that fastens the drive unit 12 and the frame 15. 3 is a side view of the drive unit 12 removed from the conveyor frame 15 of the drive apparatus shown in FIG. 1, FIG. 4 is a bottom view of the drive unit, and FIG. 5 is a cross-sectional front view of FIG. Illustrated. By removing this, the belt 20 is loosened and removed from the frame 15 to clean the front and back surfaces of the belt, and further cleaning or maintenance of the required parts of the frame and the driving unit are performed. In addition, it is assembled and used again.

FIG. 6 is a side view of the drive unit in the second embodiment, and FIG. 7 is a cross sectional front view of FIG. 8 is a side view of the drive unit removed in the apparatus of FIG. The drive unit 12 of this example is driven by attaching the motor 45 and the gear box 46 in the longitudinal axis direction of the swinging frame body 32 and protruding the rotating shafts 47 and 47 on the left and right sides of the gear box 46. A plurality of catch clips provided with springs and engagement poles between the T-groove 18 on the side of the frame 15 and the side plate 31a of the drive unit 12 while fixing the pulleys 48 and 48. (57, 57) are installed to make the frame and drive unit detachable.

When the catch clip 57 alone is not sufficient to assemble the frame and the drive unit, the fastening of the screws 14 may be used together in the first embodiment. Further, the skeletal side view of the second embodiment is shown as in FIG. 10 as in the previous embodiment.

Table 1 shows the performance of the rubber spring.

TABLE 1

2nd and 3rd degree (belt width 100mm)

FIG. 9 shows a side view of the drive section in the third embodiment, in which the leaf spring 60 is used instead of the rubber spring in the first and second embodiments to elastically support the drive pulley 48. The leaf spring of the illustrated example forms an L shape when viewed from the side, and one side 61 of the leaf spring is fixed to the support frame 31 of the drive unit with a bolt 63, and the other side 62 is the free end side of the motor 45. And the driving pulley 48 is placed thereon. The dimensional shape of the leaf spring 60 is determined by the formula of the bending stress based on the plate thickness, width, effective length, Young's modulus and load. Also in this case, the belt 20 fitted into the inner pulleys 23 and 24 and the driving pulley 48 is frictionally driven at a predetermined torque by pressing from the outside of the belt of the driving pulley 48, so that the conveyed object on the belt can be moved. Transfer. In addition, the take-up device can be omitted by pressing the drive pulley 48 against the belt side.

FIG. 10 is a side view of the drive unit in the fourth embodiment, and FIG. 12 is a skeletal side view thereof.

In this example, the frame 15 and the drive unit 12 are assembled so that the screws 14 and the catch clip 57 can be freely detached, but the drive unit 12 has the same rubber spring as in the previous embodiment. And does not have a rocking frame body. For this reason, the drive pulley 55 is pressed to the belt side by the other catch clip 58.

That is, the motor 50 and the drive pulley 55 with a reducer are installed in the support frame of the drive unit 12.

The chain 51 is fastened to the sprocket 52 of the output shaft of the motor 50 with a reduction gear, and the sprocket 53 provided in the shaft of the drive pulley. The inner pulley 25 and the push pulley 26 are attached to the frame 15 at the attachment portion of the drive unit 12. The inner pulley 25 is disposed on the inclined lower portion of the drive pulley 55 so that the belt is wrapped around about 135 ° of the circumferential surface of the drive pulley 55. A spring member is inclined at about 45 ° with respect to a vertical line including the axis of the drive pulley 55 between the axis of the drive pulley 55 and the side plate of the support frame so as to push the drive pulley 55 from the outside of the belt. Attach the clip 58.

Also in this case, since the belt 20 fitted into the inner pulley 25 and the driving pulley 30 is frictionally driven with a predetermined torque by pressing from the outside of the belt of the driving pulley 55, the belt-shaped conveyed object is removed. It moves in the direction of the arrow of FIG. In addition, by removing the screws 14 and the catch clips 57 and 57 which have fastened the drive unit 12 and the frame 15 to each other, the drive clip 12 and the frame ( 15) can be removed. Furthermore, in the present embodiment, the catch clip 57 and the screw 14 are used to fix the drive unit 12 to the frame 15. However, if the catch clip 57 can be attached with sufficient strength, the screw 14 ), And on the contrary, if sufficient strength can be obtained by fixing only the screws 14, the catch clip 57 can be omitted.

FIG. 13 shows a skeletal cross-sectional view of the fifth embodiment, in which one inner pulley 27 is provided at approximately the center of the lower side of the frame, and the inner pulley 27 and the driving pulley 30 in the driving unit 12 are shown. ), The belt 20 is fitted.

14 is a skeletal side view of the sixth embodiment. In this case, the belt 20 is sandwiched between the head pulley 21 at the rear end of the frame and the drive pulley 30 in the drive unit 12, and the pulley 21 serves as the inner pulley.

FIG. 15 is an explanatory view showing the configuration of the seventh embodiment, and as shown in the same figure, in this embodiment, unlike the first to sixth embodiments described above, the inner pulley is driven by the pressing force of the elastic body. It is configured to be pressed down to generate a friction force with the driving pulley to drive the belt conveyor.

FIG. 15 (a) shows a plan view of the drive unit of the belt conveyor according to the seventh embodiment, FIG. 15 (b) shows a side view, and FIG. 15 (c) shows a side view of the pressing means. As shown in the figure, the driving device secures the supporting rod 74 between the two frames 15 provided in parallel, and attaches the rubber spring 33a as the pressing means 33 to the supporting rod 74. On the lower surface side of the plate 73 supported by the rubber spring 33a, two inner pulleys 71 and 72 having concave grooves 71a and 72a formed at the center thereof are rotatably freely spaced apart by a predetermined interval, and the rubber spring 33a is provided. The pressure is applied to the inner surface of the endless belt 20 on the return side of the pulleys 72 and 72 by pressing force.

In addition, a drive unit 76 housed in a cage-shaped support frame 75 is disposed below the frame 15, and the drive unit 76 is infinitely formed between the inner pulleys 71 and 72 described above. The drive pulley 77 to which the belt 20 is fitted and the motor 78 which are rotatably fixed to the central axis of this drive pulley 77 and transmit a rotational force are arrange | positioned. Catch clips 57 and 58 are attached to the side of the support frame 75 so that the support frame 75 can be detachably attached to the frame 15. As shown in FIG. The entire drive unit 76 can be removed from the frame 15 by picking up (57, 58) upward and removing the engagement with the frame 15.

Next, the operation of the present embodiment will be described. As shown in FIG. 15 (b), when the drive unit 76 is fixed to the frame 15 of the conveyor, the drive pulleys 77 disposed inside the drive unit 76 are necessarily the inner pulleys 71 and 72. ) And the endless belt 20 on the return side between the corresponding drive pulley 77 and the inner pulleys 71 and 72. In this case, since the pressing force of the rubber spring 33a is applied to the two inner pulleys 71 and 72 as shown in Fig. 15 (c), it is pushed downward. When the drive pulley 77 is rotated while the endless belt 20 is fitted at a predetermined pressure, the endless belt 20 is driven by the frictional force.

When the surface of the endless belt 20 and the like are contaminated and need to be cleaned, the catch clips 57 and 58 are removed, and the entire support frame 75 of the drive unit 76 is removed. As a result, since the pressing force acting between the driving pulley 77 and the inner pulleys 71 and 72 is released, the endless belt 20 is loosened with respect to the inner pulleys 71 and 72, and the first pulley is loosened. As shown in the figure, when the head pulley 21 and the table pulley 22 are removed, the endless belt 20 can be easily removed.

Moreover, when the washing | cleaning of the endless belt 20 is complete | finished and it attaches again, it can install easily by the procedure of a removal operation and a reverse.

In this way, in the belt conveyor of the seventh embodiment, the front angles are generated in that the friction force is generated between the driving pulleys 77 by giving the lower pressing force to the inner pulleys 71 and 72. Although different from the embodiment, the ease of removal is the same as in the above-described embodiments, and the endless belt 20 can be attached and detached by a simple operation of removing the catch clips 57 and 58, for example, conveying food and the like. This is a belt conveyor, which is extremely useful when regular cleaning is required.

FIG. 16 is a configuration diagram showing the configuration of the belt conveyor according to the eighth embodiment of the present invention. FIG. 16A is a plan view, (b) is a side view, and (c) is a side view of the pressing means, respectively. . In this embodiment, the friction force between the inner pulleys 82 and 83 and the driving pulley 77 is generated. In the seventh embodiment, the rubber spring 33a is used. In this embodiment, the coil spring 81 is used. ) Is different. That is, in this embodiment, the rectangular attachment frame 84 is arrange | positioned under the frame 15, and one inner pulley 82 is freely attached to the attachment frame 84 by rotation. In addition, the inner pulley 83 of the other side is accommodated in the U-shaped groove 89 formed at the side of the attachment frame 84, so that the inner pulley 83 can be rotated and slide in the horizontal direction. There is a number.

Further, the end of the rotation shaft of the inner pulley 83 is rotatably fixed by the yoke 90, and the long side of the yoke 90 is connected to the attachment frame 84 between the compression coil springs 81. . Therefore, the yoke 90 slides in the horizontal direction with the expansion and contraction of the compression coil spring 81, and furthermore, the inner pulley 83 also slides along the U-shaped groove 89 of the attachment frame 84. It becomes. Further, as shown in FIG. 16 (a), two guide bars 85 and 86 are planted on the long side of the yoke 90, and the sockets 87 and 88 formed in the attachment frame 84 are provided. The slide is fitted freely. Like the seventh embodiment shown in FIG. 15, the drive unit 76 is detachably attached to the bottom of the frame 15 by catch clips 57 and 58. FIG.

In the present embodiment, when the support frame 75 of the drive unit 76 is fixed to the frame 15, the drive pulley 77 is positioned between two inner pulleys 82 and 83, when attached. By the pressing force of the inner pulley 83 is pressed to the right in the figure, the compression coil spring 81 is compressed so that the inner pulley 83 slides in the right direction. In this case, since the force is applied to the inner pulley 83 on the left side by the pressing force of the compression coil spring 81, the driving pulley 77 is pressed. Thus, the endless belt 20 on the return side is fitted between the two inner pulleys 82 and 83 and the driving pulley 77. When the driving pulley 77 is rotated by the friction force generated between the pulleys, the endless belt 20 is operated. In addition, when the endless belt 20 is removed, the entire drive unit 76 is detached by removing the catch clips 57 and 58, so that friction between the inner pulleys 82 and 83 and the endless belt 20 is released. Infinite belts can be easily worn.

17 is a configuration diagram showing the drive unit of the belt conveyor according to the ninth embodiment of the present invention. FIG. 17A is a plan view, (b) is a side view, and (c) is a side view of the pressing means, respectively. . As shown, this embodiment is substantially the same as the seventh and eighth embodiments described above, but in this embodiment the leaf spring 93 is used as a pressing means for pressing the inner pulleys 91 and 92 downward. It is different in that it is. That is, in this embodiment, the leaf spring 93 is fixed to the frame 15 of the conveyor with the bolt nut, and the rectangular support frame 94 is also fixed to the leaf spring 93 with the bolt nut. It is. In the support frame 94, two inner pulleys 91 and 92 are arranged at a predetermined interval apart. Therefore, when the upward force acts on the inner pulleys 91 and 92, the downward force acts by the pressing force of the leaf spring 93.

Now, when the drive unit 76 is fixed to the frame 15, the endless belt 20 on the side returned by the drive pulley 77 and the two inner pulleys 91 and 92 is fitted, and the friction force generated in this case As a result, the endless belt 20 operates in conjunction with the rotation of the driving pulley 77. As in the seventh and eighth embodiments, when the endless belt 20 is worn, the catch clips 57 and 58 can be easily removed.

In addition, in each of the embodiments shown in Figs. 15 to 17, an example of attaching the drive unit 76 to the frame 15 using the catch clips 57 and 58 has been described. In the case of not considering this much, it is also possible to fix using a bolt and a nut (not shown), without using a catch flip.

As described above, in the present invention, the drive unit of the belt is detachably installed at the lower part of the frame, and the drive pulley contacting the outer surface of the belt returning to the drive unit is disposed, and at the same time, the drive unit is attached to the bottom of the frame at the position where the drive unit is attached. At least one inner pulley in contact with the inner surface of the belt is provided, and the belt fitted with the inner pulley and the driving pulley is friction-driven by pressing the driving pulley from the outer side of the belt to the inner pulley side, thereby making the drive unit of the belt conveyor more compact. You can do it. According to the present invention, the take-up device can be omitted. Since the belt tension is low, a cheap belt conveyor can be milled using an ordinary belt. Moreover, since the conveyor frame and the drive unit are assembled and detached freely by a plurality of screws or catch-clamps, the assembly and disassembly are easy, and the belt is detached from the frame after removal and the maintenance of the belt, the frame and the drive unit is easy.

Claims (16)

A frame; A belt holding member mounted at the front and rear ends of the frame; An endless belt placed between the belt holding members; A belt driving unit provided with a detachable free passage at a predetermined position under the frame, the belt driving unit having a drive pulley in contact with an outer surface of the belt on the return side of the endless belt and a motor with a reducer for driving the drive pulley; At least one inner pulley in contact with an inner surface of a return side belt installed under the frame corresponding to the attachment position of the drive unit; A drive device for a small belt conveyor, comprising pressing means for elastically pressing a belt sandwiched between the inner pulley and the driving pulley and fitted to both pulleys from the driving pulley side to the inner pulley or from the inner pulley side to the driving pulley. According to claim 1, wherein the drive unit is a support frame provided with a detachable free passage in the lower portion of the frame and the horizontal axis fixed in the direction orthogonal to the frame longitudinal direction in the support frame and the swinging frame body slidably attached to the horizontal axis, the swinging A drive pulley supported by the frame body and pressure-contacted to the outer side belt outer surface of the endless belt, and a motor with a reducer for driving the drive pulley; The pressing means is installed around the transverse axis and is swingably attached to the transverse axis through an elastic member and an elastic member to impart a torsional moment to the transverse axis to pressurize the swinging frame body in one direction. It is made of a body, whereby the drive pulley drive device of the small belt conveyor, characterized in that the pressing by the elastic side of the elastic member is always pressed to the inner pulley side. According to claim 1, wherein said pressing means comprises a support frame provided with a removable free passage in the lower portion of the frame, and the L-shaped leaf spring having a horizontal side and a vertical side fixed to the front of the support frame; A drive pulley is placed on the horizontal side of the leaf spring, the drive pulley is a small belt conveyor drive device, characterized in that the pressing of the belt on the inner pulley side at all times by the belt elasticity of the leaf spring. 2. A drive system for a compact belt conveyor according to claim 1, wherein the head belt holding member and the tail belt holding member are non-rotating belt sliding guides fixed to the frame ends or detachably dropped. 2. A drive system for a compact belt conveyor according to claim 1, wherein the head belt holding member and the tail belt holding member are pulleys supported or detachably provided at the end of the frame. According to claim 1, wherein the frame is a small belt conveyor drive device, characterized in that the connection between the upper and left frame members of the slide bed. According to claim 1, wherein the frame is a small belt conveyor drive device characterized in that a plurality of carrier rollers are arranged at intervals between the upper end of the left and right frame member. The method of claim 2, wherein the pressing means is composed of a rocking frame body with a rubber spring, the rubber spring is composed of a metal cylindrical inner and outer cells and a cylindrical rubber body, the inner cell is 45 ° displacement It is inserted concentrically into the outer cell in the state of having a compact, characterized in that the compression operation while rolling a cylindrical rubber body by pressing a plurality of rubber body between each side of the inner cell and the outer cell corner portion Drive of the belt conveyor. The method of claim 1, wherein the driving pulley is always pressed to the inner pulley side by a rubber spring, and the belt fitted to the inner pulley and the driving pulley is frictionally driven by pressing from the outside of the belt of the driving pulley. Driving device of small belt conveyor. 8. The belt holding member, the carrier roller, the inner pulley, the driving pulley and the slide bed have concave grooves in the center thereof, and correspondingly, the concave grooves in the longitudinal direction of the rear face of the endless belt. A drive device for a small belt conveyor, which is provided with a convex slip that can fit into a groove to prevent zigzag of the belt. The drive unit of claim 10, wherein the drive unit attaches the motor and the gearbox to the longitudinal axis direction of the rocking frame body, protrudes the rotation shafts on the left and right sides of the gearbox, and fixes the drive pulley, A drive system for a small belt conveyor, characterized in that the frame and the drive unit are detachably freely assembled by installing a plurality of catch clips having springs and engaging foams between the drive plate side plates. The motor according to any one of claims 1 to 3, wherein a motor with a reducer and a drive pulley are provided in a support frame of the drive unit, and the chain is hooked on a sprocket provided on the sprocket of the output shaft of the motor with the reducer and the shaft of the drive pulley. At the attachment part of the drive unit, the inner pulley and the push pulley are provided on the frame, and the inner pulley is disposed under the inclined bottom of the drive pulley so that the belt is wound over the circumferential surface of the driving pulley about 135 °. The frame and the drive unit are detachable and assembled by attaching a catch clip inclined at about 45 ° with respect to the vertical line including the axis of the drive pulley between the drive pulley shaft and the side plate of the support frame so as to push from the outside of the belt. Driving device of a small belt conveyor characterized in that. 4. The drive of a small belt conveyor according to any one of claims 1 to 3, wherein one inner pulley is provided at approximately the center of the lower side of the frame, and a belt is fitted to the inner pulley and the driving pulley in the driving unit. Device. 4. A drive system for a small belt conveyor according to any one of claims 1 to 3, wherein a belt is fitted to the head pulley at the rear end of the frame and the drive pulley in the drive unit. 2. A drive system for a small belt conveyor according to claim 1, wherein a pressing means is arranged in the frame to elastically press the belt sandwiched between the inner pulley and the driving pulley to the driving pulley on the inner pulley side. 16. The belt according to claim 15, wherein the pressing means makes the belt attached to the drive pulley elastically from the inner pulley side by slidably sliding a rectangular attachment frame provided below the frame and an inner pulley attached to the attachment frame in the longitudinal direction in the attachment frame. Driving device for a small belt conveyor, characterized in that the compression coil spring for pressing.