CN209777475U

CN209777475U - Belt tension adjusting device, belt conveyor and color sorter

Info

Publication number: CN209777475U
Application number: CN201920432649.9U
Authority: CN
Inventors: 张昔峰; 陈锡文; 陈原; 徐伟
Original assignee: Hefei Meyer Optoelectronic Technology Inc
Current assignee: Hefei Meyer Optoelectronic Technology Inc
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2019-12-13
Anticipated expiration: 2029-03-29

Abstract

the utility model provides a belt tension adjusting device, a belt conveyor and a color sorter, wherein the belt tension adjusting device comprises a side plate, a fastening screw, a positioning seat and a long bolt; one side of the rear end of the side plate is used for being in pivot connection with one shaft end of the rear roller so that the rear roller can pivot relative to the side plate in a plane formed by the front and rear directions and the left and right directions, and the side plate is provided with a waist hole which extends along the front and rear directions; the fastening screw is used for penetrating through the waist hole and loosening or fixing the side plate on the machine frame; the positioning seat is positioned in front of the side plate, is spaced apart from the side plate and is used for being movably fixed on the rack along the front-back direction; the long bolt is provided with a cap body and a screw rod, the cap body is located on the front side of the positioning seat and used for pressing against the positioning seat when the belt reaches the maximum allowable tension force, and the screw rod penetrates through the positioning seat in a threaded connection mode along the front-back direction and abuts against one side of the front end of the side plate. Therefore, the belt tension calibration device can be used for calibrating the maximum allowable tension, reliably adjusting the tension and the deviation of the belt and reducing the dependence on the experience of a person.

Description

Belt tension adjusting device, belt conveyor and color sorter

Technical Field

The utility model relates to a tensile force field of adjusting, more specifically relate to a belt tensile force adjusting device, a belt conveyor and look selection machine.

Background

in the working process of the crawler-type color selector, materials to be sorted are stably conveyed to a sorting area from a feed hopper area at a certain speed through a horizontally arranged belt conveyor, and the materials are horizontally thrown out at the front end of the belt conveyor and then are recognized, rejected and the like, so that the whole color selection process is realized.

The belt conveyor is used as a core component in the structure of the crawler-type color sorter, and the operation stability of the belt conveyor plays an extremely critical role in the whole sorting process. Different from a common belt conveyor for conveying materials, a belt conveyor of a crawler-type color sorter generally has the characteristics of small roller diameter, large belt width, large circumference, small elasticity, high running speed and the like, and when a belt is not deflected or tensioned and adjusted, if the belt is improperly adjusted, particularly when the belt is excessively tightly adjusted, excessive stress is easily caused to parts such as rollers, bearings and the like, so that malignant faults such as roller breakage, bearing damage and the like are caused, and the reliability of the whole machine is influenced.

The observation of the belt tension and the belt deviation in the prior art is completely judged by the experience of operators, the requirements on the working experience of the operators are high, the uncontrollable belt tension is easily caused when the operators who are not trained regularly adjust the belt deviation or the belt deviation, the damage to a roller shaft and a bearing is caused, and the failure rate of the whole machine is high.

SUMMERY OF THE UTILITY MODEL

In view of the problems existing in the prior art, an object of the utility model is to provide a belt tension adjusting device, a belt conveyor and look selection machine, its tensile force and the belt off tracking that can adjust the belt reliably are adjusted to reduce the dependence to operating personnel experience.

In order to achieve the above object, in a first aspect, the present invention provides a belt tension adjusting device, which includes a side plate, a fastening screw, a positioning seat, and a long bolt; the side plate is used for being positioned between a front roller and a rear roller of the belt conveyor, which are surrounded by a belt, along the front-back direction, one side of the rear end of the side plate is used for being in pivot connection with one shaft end of the rear roller so that the rear roller can pivot relative to the surface formed by the side plate in the front-back direction and the left-right direction, and is provided with a waist hole which extends along the front-back direction; the fastening screw is used for penetrating through the waist hole of the side plate and loosening or fixing the side plate on the machine frame; the positioning seat is positioned in front of the side plate, is spaced apart from the side plate and is used for being movably fixed on the rack along the front-back direction; the long bolt is provided with a cap body and a screw rod, the cap body is located on the front side of the positioning seat and used for pressing against the positioning seat when the belt reaches the maximum allowable tension force, and the screw rod penetrates through the positioning seat in a threaded connection mode along the front-back direction and abuts against one side of the front end of the side plate. Wherein, the size of waist hole along fore-and-aft direction sets to: when the long bolt pushes the side plate to move along the front-back direction under the condition that the cap body is pressed against the positioning seat and the screw rod is abutted against one side of the front end of the side plate, the center distance between the front roller and the rear roller can reach the center distance between the front roller and the rear roller corresponding to the maximum allowable tension force of the belt. The maximum allowable tension of the belt is defined as the center distance between the front roller and the rear roller corresponding to the maximum allowable tension of the belt, and the center distance is the center distance when the belt is tightly stretched on the front roller and the rear roller according to the theoretical circumference.

In one embodiment, the side plate has a rear end portion on a rear end side thereof, and the rear end portion has an upper plate portion, a lower plate portion, and a mounting hole. The mounting hole penetrates through the rear end part along the left-right direction, the upper plate part and the lower plate part are separated by the mounting hole along the up-down direction and the front-back direction, and the mounting hole is used for accommodating the corresponding shaft end of the rear roller along the left-right direction; the upper plate portion has an upper hole penetrating in the vertical direction, and the lower plate portion has a lower hole penetrating in the vertical direction, the upper hole and the lower hole being identical in structure and aligned in the vertical direction. The belt tension adjusting device further comprises a mounting nail, and the mounting nail is used for penetrating through an upper hole of the upper plate part along the up-down direction, penetrating through the corresponding shaft end of the rear roller in the left-right direction in a clearance fit manner and penetrating through a lower hole of the lower plate part, so that the rear roller is pivotally connected to the side plate.

in one embodiment, the dimension of the mounting hole in the front-rear direction is larger than the portion of the corresponding shaft end located outside the axis of the mounting nail in the left-right direction.

In one embodiment, the side panel further has a main body portion and a front end portion, the front end portion and the rear end portion being connected to both sides of the main body portion, respectively, a dimension of the upper plate portion and the lower plate portion in the left-right direction being larger than a dimension of the main body portion in the left-right direction, the upper plate portion and the lower plate portion protruding inward in the left-right direction with respect to the main body portion.

In one embodiment, the belt tension adjusting device further comprises a nut mounted on the long bolt, and the nut is used for fastening and abutting against the rear side face of the positioning seat.

In one embodiment, the positioning seat is provided with a long round hole, the long round hole penetrates through the positioning seat along the left-right direction, and the size of the long round hole along the front-back direction is larger than the size of the long round hole along the up-down direction; the belt tension adjusting device further comprises a locking screw, and the locking screw is used for penetrating through the long round hole of the positioning seat along the left-right direction and loosening or fixing the positioning seat on a rack of the belt conveyor.

In one embodiment, the belt tension adjusting apparatus further includes a fixing plate and a fixing screw; the fixing plate is positioned in front of the positioning seat and spaced from the positioning seat, and the fixing plate is used for being fixed on a rack of the belt conveyor; the fixing screw passes through the fixing plate in a threaded connection mode along the front-back direction and is pressed against the positioning seat.

In one embodiment, the belt tension adjusting unit is mirror-symmetrical in structure with respect to a center line of the belt tension adjusting unit in an up-down direction.

In order to achieve the above object, in a second aspect, the present invention provides a belt conveyor, comprising a frame, a front roller, a rear roller, a belt tension adjusting device according to the first aspect, and a calibrating device, wherein the front roller is mounted on the frame, and the belt is arranged around the front roller and the rear roller; the calibrating device is used for providing a calibrating position, and the calibrating position provided by the calibrating device is positioned on the lower edge of the belt when the belt is tightened on the front roller and the rear roller according to the theoretical circumference. In one embodiment, two shaft ends in the left and right directions of the rear roller are respectively provided with a belt tension adjusting device.

In order to achieve the above object, in a third aspect, the present invention provides a color sorter including the belt conveyor of the second aspect.

The utility model has the advantages as follows: the belt tension calibrating device has the advantages that the maximum allowable tension can be calibrated through the arrangement of the fastening screws, the waist holes of the side plates, the cap bodies of the long bolts and the screws, so that the belt tension calibrating device can be used for reliably adjusting the tension of a belt and adjusting the belt deviation, and the dependence on the experience of an operator is reduced.

Drawings

Fig. 1 is a perspective view of a belt conveyor according to an embodiment.

Fig. 2 is a side view of fig. 1.

Fig. 3 is a top view of fig. 1.

Fig. 4 is a perspective view of a belt tension adjusting apparatus of a belt conveyor, showing rear rollers for clarity.

fig. 5 is a perspective view of a side plate of the belt tension adjusting apparatus.

Fig. 6 is a partially assembled perspective view of the belt tension adjusting apparatus.

FIG. 7 is a schematic diagram of a tension calibration operation when a belt is first installed (or replaced).

Wherein the reference numerals are as follows:

D1 protrusion in front-back direction 502a

Rear end in the left-right direction 503 of D2

D3 vertical direction 503a upper plate part

1 rack h1 upper hole

11 frame 503b lower plate part

12 mounting plate h2 lower hole

13 guide rail 503c mounting hole

2 front roller 51 fastening screw

3 rear roller 52 positioning seat

Front side of 30 cylinder 521

31 axle end 522 rear side

long round hole of 32 bearing 523

4 belt 53 long bolt

41 lower edge 531 hat body

6 calibrating device 532 screw rod

61 upper boundary 54 mounting nail

5 Belt tension adjusting device 55 nut

50 side plate 56 locking screw

501 Main body 57 cover plate

501a waist hole 58 fixing plate

502 front end 59 fixing screw

Detailed Description

The accompanying drawings illustrate embodiments of the present invention and it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms, and therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention.

Further, expressions of directions indicated for explaining operations and configurations of respective members in the embodiment, such as upper, lower, left, right, front, and rear, are not absolute but relative, and although these indications are appropriate when the respective members are in the positions shown in the drawings, when the positions are changed, the directions should be interpreted differently to correspond to the changes.

Fig. 1 is a perspective view of a belt conveyor according to an embodiment. Fig. 2 is a side view of fig. 1.

Fig. 3 is a top view of fig. 1.

As shown in fig. 1 to 3, the belt conveyor includes a frame 1, a front roller 2, a rear roller 3, a belt 4, a belt tension adjusting device 5, and a calibration device 6.

the rack 1 includes a frame body 11 and a mounting plate 12. The frame 1 further comprises guide rails 13. The guide rail 13 is mounted on the mounting plate 12. Of course, depending on the actual use and the structural design of the frame 11, the mounting plate 12 may not be required. The front roller 2 is mounted to the frame 1. Specifically, the front roller 2 is mounted to a frame 11 of the frame 1, for example, the front roller 2 is mounted to the frame 11 of the frame 1 through a bearing (not shown). Two shaft ends 31 of the rear roller 3 in the left-right direction D2 are each provided with a belt tension adjusting device 5. Of course, it is possible to arrange the belt tension adjusting device 5 at one of the two shaft ends 31 of the rear roller 3 in the left-right direction D2 and to arrange another type of belt tension adjusting device at the other of the two shaft ends 31 of the rear roller 3 in the left-right direction D2, and it is preferable that each of the two shaft ends 31 of the rear roller 3 in the left-right direction D2 is provided with one belt tension adjusting device 5 from the viewpoint of design and manufacture. The rear roller 3 includes a cylindrical body 30, two shaft ends 31, and two bearings 32, and each shaft end 31 is connected to the cylindrical body 30 via a bearing 32, so that the cylindrical body 30 can rotate with respect to the shaft end 31 (i.e., rotate in a plane defined by the front-rear direction D1 and the vertical direction D2). A belt 4 is disposed around the front roller 2 and the rear roller 3. The belt tension adjusting device 5 is configured to drive the rear roller 3 to move in the front-rear direction D1 through the shaft end 31 when adjusting the tension, so as to calibrate the maximum allowable tension of the belt 4, adjust the tension, and adjust the deviation, which will be described in detail later. The aligning device 6 is adapted to be placed outside the left-right direction D2 of the lower edge 41 of the belt 4 to provide an aligning position. The calibration position provided by the calibration device 6 is located on the lower edge 41 of the belt 4 when the belt 4 is tightened to the theoretical circumference just above the front roller 2 and the rear roller 3. In an embodiment, the calibration means is a calibration scale. Accordingly, the upper boundary 61 of the calibration device 6 is positioned: theoretically determining a state of just tightening of the belt 4 wound around the front roller 2 and the rear roller 3 (i.e., the belt 4 wound around the front roller 2 and the rear roller 3 is in a straight line on both sides of the up-down direction D3, and a tension of the belt 4 in this state is defined as a maximum allowable tension, in other words, the maximum allowable tension of the belt 4 is defined as a center distance between the front roller 2 and the rear roller 3 to which the maximum allowable tension of the belt corresponds when the belt 4 is just tightened on the front roller 2 and the rear roller 3 in accordance with the theoretical circumference), based on the circumference and thickness of the belt 4, the outer diameter of the front roller 2, the outer diameter of the rear roller 3, and a distance between the axis of the front roller 2 and the axis of the rear roller 3 in the front-back direction D1, selecting a reference point (e.g., the axis of the front roller 2 as a reference point), and defining a coordinate relationship of the lower edge 41 of the belt 4 in a state of just tightening (i.e., a coordinate in the front-back direction D1) The relationship between the value and the coordinate value in the up-down direction D2), based on the coordinate relationship of the lower edge 41 of the belt 4 in the just-tightened state, the upper boundary 61 of the calibrating device 6 is placed on the frame 1 and at a certain point of the coordinate relationship of the lower edge 41 of the belt 4 in the just-tightened state, i.e., the calibrating device 6 is used to calibrate the maximum allowable tension of the belt 4, and when the upper boundary 61 of the calibrating device 6 is overlapped with the lower edge 41 of the belt 4 by visual observation in the orthographic projection manner in the left-right direction D2, the calibration of the maximum allowable tension of the belt 4 is completed, which will be described in detail later. By adopting the calibrating device 6, the dependence on the experience of manually adjusting the maximum allowable tension of the belt 4 when the belt 4 is installed (or replaced) for the first time can be greatly reduced, the accuracy and efficiency of calibrating the maximum allowable tension of the belt 4 are improved, the damage to components of a belt conveyor is avoided, and the running reliability of the belt conveyor is ensured. Of course, the calibration device 6 may also take other forms, for example, a laser calibration method is adopted, the calibration device 6 emits laser light with a set coordinate system, a laser spot is projected from the outside to the belt 4 along the front-back direction D2, and when the laser spot is placed at a certain point of the coordinate relationship of the lower edge 41 of the belt 4 in the just-tightened state, that is, when the emitted laser spot of the calibration device 6 is overlapped with the lower edge 41 of the belt 4 as visually observed from the orthographic projection method of the left-right direction D2, the calibration of the maximum allowable tension of the belt 4 is completed.

The constitution of the belt tension adjusting device 5 will be described in more detail below.

Fig. 4 is a perspective view of the belt tension adjusting device 5 of the belt conveyor, showing the rear rollers for clarity. Fig. 5 is a perspective view of a side plate 50 of the belt tension adjusting device 5. Fig. 6 is a partially assembled perspective view of the belt tension adjusting device 5.

as shown in fig. 4 to 6, the belt tension adjusting device 5 includes a side plate 50, a fastening screw 51 positioning seat 52, and a long bolt 53. The belt tension adjusting means 5 further includes a mounting nail 54 according to actual use. The belt tension adjusting means 5 further includes a nut 55 according to actual use. The belt tension adjusting means 5 may further include a locking screw 56 depending on actual use. The belt tension adjusting device 5 may further include a cover plate 57 depending on actual use. The belt tension adjusting device 5 may further include a fixing plate 58 and a fixing screw 59 according to actual use.

The side plate 50 is located between the front roller 2 and the rear roller 3 of the belt conveyor around which the belt 4 is wound in the front-rear direction D1.

The side plate 50 has a main body 501, a front end 502, and a rear end 503.

The side plate 50 is movably fixed to the chassis 1 in the front-rear direction D1. Specifically, as shown in fig. 6, the main body 501 of the side plate 50 is movably fixed to the mounting plate 12 of the rack 1 in the front-rear direction D1. In order to make the movement of the side panel 50 in the front-rear direction D1 smooth and to make the side panel 50 restricted in the up-down direction D3, as shown in fig. 6, the main body portion 501 of the side panel 50 is slidably fitted with the guide rail 13 and restricted by the guide rail 13 in the up-down direction D3.

The side plate 50 is provided with a waist hole 501a, and preferably the waist hole 501a is provided in the main body portion 501, but the waist hole 501a is not limited thereto, and the waist hole 501a may be provided in any portion of the side plate 50 (i.e., any one or more of the main body portion 501, the front end portion 502, and the rear end portion 503) as long as it can be fixed to the rack 1 so as to be movable in the front-rear direction D1. The waist hole 501a extends in the front-rear direction D1. Specifically, the waist hole 501a penetrates the main body 501 in the left-right direction D2, and the size of the waist hole 501a in the front-rear direction D1 is larger than the size of the waist hole 501a in the up-down direction D3. The size of the waist hole 501a in the front-rear direction D1 is set to: when the after-mentioned cap 531 presses the positioning seat 52 (specifically, for example, the front side surface 521) and the after-mentioned screw 532 pushes the side plate 50 to move in the front-rear direction D1 under the side plate 50 having a front end (specifically, for example, the front end portion 502) abutting against the after-mentioned screw 532, the center distance between the front roller 2 and the rear roller 3 can be set to the center distance between the front roller 2 and the rear roller 3 corresponding to the maximum allowable tension of the belt 4; wherein, the maximum allowable tension of the belt 4 is defined as the center distance between the front roller 2 and the rear roller 3 corresponding to the maximum allowable tension of the belt, which is the center distance when the belt 4 is tightened on the front roller 2 and the rear roller 3 according to the theoretical circumference. In other words, the actual working center distance between the front roller 2 and the rear drum 3 is controlled within the center distance of the front roller 2 and the rear drum 3 corresponding to the maximum allowable tension of the belt 4. The waist hole 501a can also function as follows: the side plate 50 is limited to move in the front-back direction D1 by matching with the fastening screw 51, so that the belt 4 cannot be inclined after being installed; the waist hole 501a limits the maximum distance and the minimum distance between the front roller 2 and the rear roller 3, plays a role in effectively protecting the belt 4, avoids the phenomenon that the belt is broken due to overlarge center distance between the front roller 2 and the rear roller 3, and also avoids the phenomenon that the belt 4 is not tightened due to the overlong center distance between the front roller 2 and the rear roller 3. The number of the waist holes 501a is not limited, and is two as shown in the figure, but may be one or more than three, in other words, one or more waist holes 501a may be provided, and each waist hole 501a corresponds to the fastening screw 51. When the plurality of waist holes 501a are provided, the plurality of waist holes 501a extend in line in the front-rear direction D1 and are spaced apart from each other, whereby it is possible to ensure that the screw-coupling positions of the plurality of fastening screws 51 to the frame 1 at the time of tension adjustment of the belt 4 are aligned, thereby enhancing the effect of reducing the displacement of the side plate 50 to be described later outwardly in the left-right direction D2.

The front end portion 502 and the rear end portion 503 are connected to both sides (i.e., in the front-rear direction D1) of the main body portion 501, respectively.

The front end portion 502 of the side plate 50 is provided with a projection 502a, and the projection 502a projects outward in the left-right direction D2 from the front side of the main body portion 501.

The rear end side of the side plate 50 is adapted to be pivotally connected to one of the shaft ends 31 of the rear roller 3. In the example shown in fig. 4 to 6, the rear end 503 is pivotally connected to a corresponding one 31 of two shaft ends 31 of the rear roller 3 in the left-right direction D2, so that the rear roller 3 can pivot relative to the side plate 50 in the plane formed by the front-rear direction D1 and the left-right direction D2, thereby facilitating maximum allowable tension calibration, tension adjustment and off-tracking adjustment of the belt 4. The rear end 503 of the side plate 50 has an upper plate 503a, a lower plate 503b, and a mounting hole 503 c. The mounting hole 503c penetrates the rear end portion 503 in the left-right direction D2, the mounting hole 503c separates the upper plate portion 503a and the lower plate portion 503b in the up-down direction D3 and the front-back direction D1 (i.e., the mounting hole 503c opens outward in the front-back direction D1), and the mounting hole 503c receives a corresponding one of the shaft ends 31 of the rear roller 3 in the left-right direction D2. The upper plate portion 503a has an upper hole h1 penetrating in the vertical direction D3, the lower plate portion 503b has a lower hole h2 penetrating in the vertical direction D3, and the upper hole h1 and the lower hole h2 are identical in structure and aligned in the vertical direction D3. Preferably, the dimension of the mounting hole 503c in the front-rear direction D1 is larger than the portion of the corresponding shaft end 31 located outside the axis of the mounting nail 54 described later in the left-right direction D2, so that when the tension of the belt and the belt deviation are adjusted on one side of the left-right direction D2, the corresponding shaft end 31 pivots around the axis of the mounting nail 54 but does not collide with the inner wall surface of the mounting hole 503c (i.e., the wall surface opposite to the opening of the mounting hole 503c), and the pivoted shaft end 31 and the side plate 50 are prevented from being rigidly contacted and damaged. The upper plate part 503a and the lower plate part 503b have a dimension in the left-right direction D2 larger than the dimension of the main body part 501 in the left-right direction D2, and the upper plate part 503a and the lower plate part 503b protrude inward in the left-right direction D2 with respect to the main body part 501, so that when the rear roller 3 moves to a certain position toward the front roller 2 in the front-rear direction D1, the upper plate part 503a and the lower plate part 503b will come into contact with the guide rail 13 of the frame 1 to perform a limiting function, in other words, a function of limiting the minimum distance between the front roller 2 and the rear roller 3 as with the waist hole 501a described later.

The fastening screw 51 is used to pass through the waist hole 501a of the side plate 50 in the left-right direction D2 and to loosen or fix the side plate 50 to the frame 1 of the belt conveyor (specifically, for example, the mounting plate 12 of the frame 1). When the fastening screw 51 is loosened from the frame 1 of the belt conveyor (specifically, for example, the mounting plate 12 of the frame 1), the side plate 50 can drive the rear roller 3 to move along the front-rear direction D1 via the corresponding shaft end 31 to adjust the tension and the off tracking of the belt 4. In addition, the fastening screw 51 can fix the side plate 50 on the frame 1 (specifically, for example, the mounting plate 12), and an opposite force is applied to the side plate 50 during the operation of tensioning the rear roller 3, so that the side plate 50 is displaced to the front roller 2 (refer to the posture of fig. 1) in the front-rear direction D1 over time, and the displacement is reduced by the setting of the fastening screw 51, and thus the consistent working state of the belt 4 can be maintained all the time. The number of the fastening screws 51 is not limited, and is two as shown in the figure, but may be one or more than three, in other words, one or more fastening screws 51 may be provided, and each fastening screw 51 corresponds to one waist hole 501 a. The larger the number of the fastening screws 51, the stronger the effect of reducing the displacement of the aforementioned side plate 50 in the left-right direction D2 to the outside.

The positioning socket 52 is located forward of the side plate 50 and spaced apart from the side plate 50, for being movably fixed to the frame 1 of the belt conveyor (specifically, for example, the mounting plate 12 of the frame 1) in the front-rear direction (D1). The positioning seat 52 is provided with an oblong hole 523, the oblong hole 523 penetrates through the positioning seat 52 along the left-right direction D2, and the dimension of the oblong hole 523 along the front-back direction D1 is larger than the dimension of the oblong hole 523 along the up-down direction D3. The size of the oblong hole 523 in the front-rear direction D1 is set to: the positioning socket 52 is adapted to move in the front-rear direction D1 along with the pushing of the cap 531 of the long bolt 53 when the maximum allowable tension is calibrated, and when the maximum allowable tension is calibrated, the long bolt 53 is not moved any more and the positioning socket 52 is fixed to the frame 1 of the belt conveyor. The two oblong holes 523 are spaced apart in the up-down direction D3, and correspondingly, two locking screws 56 are provided, and each locking screw 56 corresponds to one oblong hole 523.

the long bolt 53 has a cap 531 and a screw 532. The cap 531 is located on the front side of the positioning socket 52, and the cap 531 is used to press against the positioning socket 52 (specifically, for example, the front side 521) when the maximum allowable tension of the belt 4 is reached. The screw 532 is screwed through the positioning socket 52 in the front-rear direction D1 and abuts against the front end side (specifically, for example, the front end portion 502) of the side plate 50. The action of the long bolt 53 abutting against the front end side (specifically, for example, the front end portion 502) of the side plate 50 serves to calibrate the maximum allowable tension, and also serves to reduce or eliminate the displacement of the side plate 50 in the front-rear direction D1 toward the front roller 2 (refer to the posture of fig. 1) as in the case of the aforementioned fastening screw 51, thereby maintaining the operation state of the belt 4 at all times. In the example shown in fig. 6, the long bolt 53 is screwed through the positioning socket 52 in the front-rear direction D1 and abuts against the projection 502a of the front end portion 502. Of course, if the side plate 50 has a sufficient dimension in the left-right direction D2, the protrusion 502a of the front end portion 502 may be omitted so as to satisfy the requirement that the long bolt 53 is screwed through the positioning socket 52 in the front-rear direction D1 and abuts against the front end side (specifically, for example, the front end portion 502).

The mounting nail 54 is adapted to pass through the upper hole h1 of the upper plate portion 503a in the up-down direction D3, through a corresponding one of the shaft ends 31 of the rear roller 3 in the left-right direction D2 with clearance fit, and through the lower hole h2 of the lower plate portion 503b to pivotally connect the rear roller 3 to the side plate 50. The mounting nail 54 may be a screw, and the upper hole h1 and the lower hole h2 are threaded holes, respectively; alternatively, the mounting pegs 54 may be pins, and the upper and lower holes h1 and h2, respectively, may be unthreaded holes.

The nut 55 is mounted on the long bolt 53 and is used to tightly abut against the rear side surface 522 of the positioning seat 52 (i.e., after calibration of the maximum allowable tension, after adjustment of the tension, and after completion of the off-tracking adjustment of the belt). Similarly, since the nut 55 is tightly abutted against the rear side surface 522 of the positioning seat 52, the movement of the long bolt 53 in the front-rear direction D1 toward the front roller 2 can be restricted, and the displacement of the side plate 50 in the front-rear direction D1 toward the front roller 2 (refer to the posture of fig. 1) can be further reduced or eliminated, so that the uniform operation state of the belt 4 can be always maintained. In addition, the pressure transmitted from the side plate 50 is transmitted to the positioning seat 52 through the nut 55, so that the force transmitted from the long bolt 53 to the positioning seat 52 through the thread is reduced, the effect of the long bolt 53 is enhanced, and the thread on the long bolt 53 is protected from being damaged.

The locking screw 56 passes through the oblong hole 523 of the positioning socket 52 in the left-right direction D2 and is used to loosen or fix (i.e., screw-connect) the positioning socket 52 to the frame 1 of the belt conveyor (specifically, for example, the mounting plate 12 of the frame 1).

The cover plate 57 is fixed (e.g., screwed or bonded) to the oblong hole 523 of the positioning socket 52 and covers the locking screw 56. The use of the cover plate 57 prevents unintentional removal of the positioning socket 52.

the fixing plate 58 is located in front of the positioning socket 52 and spaced apart from the positioning socket 52, for fixing to the frame 1 of the belt conveyor (specifically, for example, the mounting plate 12 of the frame 1).

The fixing screw 59 is screwed through the fixing plate 58 in the front-rear direction D1 and presses against the positioning socket 52 (in particular, for example, on the front flank 521, i.e. after calibration of the maximum permissible tensioning force). The fixing screws 59 are two and spaced apart in the up-down direction D3, and the long bolt 53 is located between the two fixing screws 59 in the up-down direction D3. The fixing screw 59 serves the same function as the aforementioned fastening screw 51 and the aforementioned long bolt 53, i.e., further reduces or eliminates the displacement of the side plate 50 in the front-rear direction D1 toward the front roller 2 (refer to the posture of fig. 1), and always maintains the consistent operation state of the belt 4, and further the function of the fixing screw 59 is enhanced because the pressure transmitted from the side plate 50 is transmitted to the frame 1 through the fixing plate 58 in part.

In one embodiment, the belt tension adjusting unit 5 is mirror-symmetrical in structure with respect to a center line of the belt tension adjusting unit 5 in the up-down direction D3. Like this, the belt tensile force adjusting devices 5 of the left and right sides of back roller 3 are the same structure, just can reverse when using, and the belt tensile force adjusting devices 5 of the left and right sides of back roller 3 can adopt same mould and the same manufacturing process preparation, and tensile force is adjusted and the belt off tracking is adjusted in the left and right sides of back roller 3 the same in principle simultaneously to reduce cost and improve work efficiency.

Next, a tension adjusting operation of the belt conveyor will be explained.

The tension operation of the belt conveyor involves a tension calibration operation when a belt is first installed (or replaced), a tension adjustment operation during the operation of the belt, and a deviation operation during the operation of the belt. Note that the explanation of the tension adjusting operation of the belt conveyor is explained with all the components of fig. 1 and the calibration device 6 employing the calibration scale, which is merely an example.

First, a tension calibration operation when a belt is first installed (or replaced) will be described.

Because the size of the circumference of the belt conveyor has an error, the error range of the circumference size of a belt with the circumference of about 5 meters generally reaches +/-3-5 mm, the influence of the error on the belt tensioning is not negligible, and therefore each belt needs to be subjected to independent tensioning force calibration when being installed for the first time, and the position of the maximum allowable tensioning force of each belt is found.

When the belt is first installed (or replaced with a new belt), the belt tension adjusting device 5 is installed on the frame 1, the fastening screws 51 on both sides (specifically, for example, both the installation plates 12) in the left-right direction D2 of the frame 1 are loosened, the installation nails 54 are removed, the locking screws 56 are loosened, the nuts 55 and the long bolts 53 (the long bolts 53 are away from the protruding portions 502a of the side plates 50) are loosened and the side plates 50 are moved toward the front roller 2, the front roller 2 is removed from the frame 1, the rear roller 3 is removed from the side plates 50 of the belt tension adjusting device 5, a new belt 4 is replaced, and then the front roller 2 is installed on the frame 1, and the shaft end 31 of the rear roller 3 is pivotally connected to the side plates 50 through the installation nails 54.

two aligning devices 6 (i.e., aligning rulers) are disposed on the frame 1 and on the outer side of the belt 4 in the left-right direction D2, and the upper boundary 61 of each aligning device 6 is disposed at a point of the coordinate relationship of the lower edge 41 of the belt 4 in the just-tightened state set as described above.

The side plates 50 on both sides in the left-right direction D2 move relative to the frame 1 (specifically, for example, the two mounting plates 12) in the front-back direction D1, specifically, the cap 531 of the long bolt 53 on both sides is rotated by a tool or by hand, so that the long bolt 53 drives the positioning seat 52 to move in the front-back direction D1 away from the front roller 2 relative to the frame 1, the screw 532 of the long bolt 53 abuts against the front end 502 (specifically, for example, the protrusion 502a) of the side plate 50 in the process of moving in the front-back direction D1 away from the front roller 2, so that the side plate 50 also moves in the front-back direction D1 away from the front roller 2, and the two axial ends 31 of the rear roller 3 also move in the front-back direction D1 away from the front roller 2 under the driving of the side plate 50, thereby achieving the purpose of increasing the center distance between the.

The change of the state of the belt 4 in the process of increasing the center distance between the front roller 2 and the rear roller 3 is explained with reference to fig. 7, and it is noted that fig. 7 shows only one side in the left-right direction D2. As shown in fig. 7(a), the belt 4 starts to be in a slack state, the lower edge 41 of the belt 4 hangs down more and is located below the calibrating device 6, the position of the rear roller 3 can be adjusted by slowly adjusting the belt tension adjusting devices 5 on both sides of the left-right direction D2 outwards, and the lower edge 41 of the belt moves up slowly; as the belt tension adjusting device 5 is continuously adjusted, the lower edge 41 of the belt passes through the state shown in fig. 7(b), and finally reaches the state shown in fig. 7(c), in which the lower edge 41 of the belt 4 is exactly coincident with the upper boundary 61 of the aligning device 6 in the left-right direction D2. The rear roller 3 is located at the position where the belt 4 is just tightened, which is the position that the whole calibration process wants to find, and the tension of the belt 4 is the maximum allowable tension defined by the whole machine. The utility model discloses in, adjust according to the distance between upper and lower direction D3 of the lower edge 41 of belt 4 along left and right direction D2 both sides and the upper boundary 61 of calibrating device 6 that sets up along left and right direction D2 both sides respectively, for example, adjust the belt tensioning adjusting device 5 of this side according to the distance along upper and lower direction D3 between the lower edge 41 of belt 4 of one side and the upper boundary 61 of calibrating device 6 of this side, adjust the belt tensioning adjusting device 5 of this opposite side according to the distance along upper and lower direction D3 between the lower edge 41 of belt 4 of opposite side and the upper boundary 61 of calibrating device 6 of this side, the distance of final regulation along left and right direction D2 both sides probably does not necessarily equal, as long as adjust the both sides off tracking can not.

When the rear roller 3 reaches the position of maximum allowable tension, the fastening screw 51 is tightened to firmly fix the side plate 50 to the frame 1 (specifically, for example, the two mounting plates 12), the locking screw 56 is tightened to fix the positioning socket 52 to the frame 1, the nut 55 is tightened to abut against the positioning socket 52, and the fixing screw 59 is tightened to press the fixing screw 59 against the positioning socket 503 in the front-rear direction D2. Note that, in this state, the positioning socket 52 fixed to the frame 1 will be a reference when the roller 3 reaches the position of the maximum allowable tension, and the long screw 55 serves as an index of the position where the rear roller 3 reaches the maximum allowable tension by the contact of its cap 531 with the positioning socket 52 (specifically, for example, the front side 521) in the front-rear direction D1. In addition, it should be noted that when the maximum allowable tension is adjusted, the long bolts 53 on both sides of the left-right direction D2 need to move the same distance as much as possible, so as to avoid the situation that one side moves more and the other side moves less, which is likely to cause the deviation of the belt 4.

finally, the calibration device 6 is removed from the frame 1 and stored, so as to avoid the interference of the calibration device 6 on the subsequent operation of the belt 4. Whereby the calibration operation at the time of initial installation of the belt (or replacement of the belt) is completed. Note that the tension adjusting operation and the belt running off tracking adjustment during the belt running after the calibration operation is completed allow only adjustment in the direction in which the belt is slack and do not require the calibration device 6 to be employed.

Next, a tension adjusting operation during the operation of the belt will be described.

the tension required for the actual operation of the belt 4, referred to herein as the operating tension, is within a range of maximum allowable tensions. When the working tension of the belt 4 is required to be smaller than the maximum allowable tension, the center distance between the front roller 2 and the rear roller 3 needs to be appropriately shortened, and only the fastening screw 51 needs to be loosened, the loosening nut 55 is rotated, and then the long bolt 53 is rotated in the opposite direction (i.e., in the front-rear direction toward the front roller 2) so that the long bolt 53 moves an appropriate distance in the front-rear direction D1 close to the front roller 2; then, the screw 51 is locked and the nut 55 is tightened.

Finally, the deviation operation in the running process of the belt is explained.

when the belt 4 deviates in one direction along the left-right direction D2 in the running process, the belt tension adjusting devices 5 on the two sides of the rear roller 3 cannot be adjusted at the same time under the condition, but the belt tension adjusting device 5 on one side is adjusted to counteract the component force during deviation. For example, when the belt 4 deviates leftward in the left-right direction D2 during operation, it is explained that the center distance between the left side of the rear drum 3 in the left-right direction D2 and the front roller 2 is smaller than the center distance between the right side of the rear drum 3 in the left-right direction D2 and the front roller 2. In this case, the center distance between the left side of the rear roller 3 in the left-right direction D2 and the front roller 2 only needs to be properly increased to counteract the force deviating leftwards in the left-right direction D2; or the center distance between the right side of the rear roller 3 along the left-right direction D2 and the front roller 2 is properly reduced, the force of left deviation along the left-right direction D2 is counteracted, and if the belt 4 deviates to the right along the left-right direction D2 in the running process, the arrangement is opposite to the above arrangement.

According to the utility model discloses a band conveyer can be applicable to the look selection machine, also can be applicable to the system of any adoption band conveyer material except that the look selection machine certainly.

The above detailed description describes exemplary embodiments, but is not intended to limit the combinations explicitly disclosed herein. Thus, unless otherwise specified, various features disclosed herein can be combined together to form a number of additional combinations that are not shown for the sake of brevity.

Claims

1. a belt tension adjusting device (5) is characterized by comprising a side plate (50), a fastening screw (51), a positioning seat (52) and a long bolt (53);

The side plate (50) is used for being positioned between a front roller (2) and a rear roller (3) of the belt conveyor, which are surrounded by a belt (4), along the front-back direction (D1), one side of the rear end of the side plate (50) is used for being pivotally connected with one shaft end (31) of the rear roller (3) so that the rear roller (3) can pivot relative to the side plate (50) in a plane formed by the front-back direction (D1) and the left-right direction (D2), the side plate (50) is provided with a waist hole (501a), and the waist hole (501a) extends along the front-back direction (D1);

The fastening screw (51) is used for penetrating through a waist hole (501a) of the side plate (50) and loosening or fixing the side plate (50) on the machine frame (1);

The positioning seat (52) is positioned in front of the side plate (50), is spaced from the side plate (50) and is used for being movably fixed on the frame (1) along the front-back direction (D1);

The long bolt (53) is provided with a cap body (531) and a screw rod (532), the cap body (531) is positioned on the front side of the positioning seat (52) and is used for pressing against the positioning seat (52) when the belt (4) reaches the maximum allowable tension force, and the screw rod (532) penetrates through the positioning seat (52) in a threaded connection mode along the front-back direction (D1) and abuts against one side of the front end of the side plate (50);

Wherein the waist hole (501a) is sized in the front-rear direction (D1) such that: when the cap body (531) is pressed against the positioning seat (52) and the screw rod (532) is abutted against one side of the front end of the side plate (50) to push the side plate (50) to move along the front-back direction (D1), the center distance between the front roller (2) and the rear roller (3) can reach the center distance between the front roller (2) and the rear roller (3) corresponding to the maximum allowable tension of the belt (4);

The maximum allowable tension of the belt (4) is defined as the center distance between the front roller (2) and the rear roller (3) corresponding to the maximum allowable tension of the belt, and the center distance is the center distance when the belt (4) is tightly stretched on the front roller (2) and the rear roller (3) according to the theoretical circumference.

2. Belt tensioning force adjusting device (5) according to claim 1,

The rear end side of the side plate (50) has a rear end part (503), the rear end part (503) has an upper plate part (503a), a lower plate part (503b) and a mounting hole (503c),

A mounting hole (503c) penetrates through the rear end portion (503) in the left-right direction (D2), the mounting hole (503c) separates the upper plate portion (503a) and the lower plate portion (503b) in the up-down direction (D3) and the front-back direction (D1), and the mounting hole (503c) is used for accommodating the corresponding shaft end (31) of the left-right direction (D2) of the rear roller (3);

The upper plate part (503a) is provided with an upper hole (h1) penetrating along the vertical direction (D3), the lower plate part (503b) is provided with a lower hole (h2) penetrating along the vertical direction (D3), and the upper hole (h1) and the lower hole (h2) are identical in structure and are aligned in the vertical direction (D3);

The belt tension adjusting device (5) further comprises a mounting nail (54), and the mounting nail (54) is used for passing through the upper hole (h1) of the upper plate part (503a) along the up-down direction (D3), passing through the corresponding shaft end (31) of the rear roller (3) in the left-right direction (D2) in a clearance fit mode and passing through the lower hole (h2) of the lower plate part (503b) so as to enable the rear roller (3) to be pivotally connected to the side plate (50).

3. The belt tension adjusting device (5) according to claim 2, wherein the mounting hole (503c) has a dimension in the front-rear direction (D1) larger than a portion of the corresponding shaft end (31) located outside the axis of the mounting nail (54) in the left-right direction (D2).

4. Belt tensioning force adjusting device (5) according to claim 2,

The side plate (50) further comprises a main body part (501) and a front end part (502), wherein the front end part (502) and the rear end part (503) are respectively connected to two sides of the main body part (501),

The dimensions of the upper plate part (503a) and the lower plate part (503b) in the left-right direction (D2) are larger than the dimensions of the main body part (501) in the left-right direction (D2), and the upper plate part (503a) and the lower plate part (503b) protrude inward in the left-right direction (D2) relative to the main body part (501).

5. belt tensioning force adjusting device (5) according to claim 1,

The belt tension adjusting device (5) further comprises a nut (55), the nut (55) is installed on the long bolt (53), and the nut (55) is used for being fastened and abutted to the rear side face (522) of the positioning seat (52).

6. Belt tensioning force adjusting device (5) according to claim 1,

The positioning seat (52) is provided with a long round hole (523), the long round hole (523) penetrates through the positioning seat (52) along the left-right direction (D2), and the size of the long round hole (523) along the front-back direction (D1) is larger than that along the up-down direction (D3);

The belt tension adjusting device (5) further comprises a locking screw (56), and the locking screw (56) is used for penetrating through the long round hole (523) of the positioning seat (52) along the left-right direction (D2) and loosening or fixing the positioning seat (52) on the rack (1) of the belt conveyor.

7. Belt tensioning force adjusting device (5) according to claim 1,

The belt tension adjusting device (5) further comprises a fixing plate (58) and a fixing screw (59);

The fixing plate (58) is positioned in front of the positioning seat (52) and is spaced from the positioning seat (52), and the fixing plate (58) is used for being fixed on a rack (1) of the belt conveyor;

The fixing screw (59) is screwed in the front-rear direction (D1) through the fixing plate (58) and pressed against the positioning socket (52).

8. the belt tension adjusting device (5) according to any one of claims 1 to 7, wherein the belt tension adjusting device (5) is mirror-symmetrical in structure with respect to a center line of an up-down direction (D3) of the belt tension adjusting device (5).

9. A belt conveyor, characterized by comprising a frame (1), a front roller (2), a rear roller (3), a belt (4), a belt tension adjusting device (5) according to any one of claims 1-8, and a calibration device (6),

The front roller (2) is arranged on the frame (1), and the belt (4) is arranged on the front roller (2) and the rear roller (3) in a surrounding manner;

The calibrating device (6) is used to provide a calibration position, which the calibrating device (6) provides is located on the lower edge (41) of the belt (4) when the belt (4) is tightened exactly on the front roller (2) and the rear roller (3) according to the theoretical circumference.

10. Belt conveyor according to claim 9, characterized in that one belt tensioning force adjusting device (5) is arranged at each of the two shaft ends (31) of the rear roller (3) in the left-right direction (D2).

11. A color sorter comprising a belt conveyor according to any of claims 9-10.