Method for adjusting idler of air cushion machine return belt turnover device

Abstract

The application provides a method for adjusting a roller of a return belt turning device of an air cushion machine, comprising the following steps: acquiring distance values collected by a first distance sensor and a second distance sensor corresponding to a turning roller group in real time; if the distance value collected by the first distance sensor is not within a preset distance range, rotating the turning roller group in a direction away from the second distance sensor, until the distance value collected by the first distance sensor is within the preset distance range; if the distance value collected by the second distance sensor is not within the preset distance range, rotating the turning roller group in a direction away from the first distance sensor, until the distance value collected by the second distance sensor is within the preset distance range, so as to detect the turning deviation of the conveying belt in real time, and adjust the angle of the turning roller group in time when the conveying belt deviates, so as to ensure the safe turning operation of the conveying belt.

Description

Technical Field

[0001] This invention relates to the field of air cushion machine technology, and in particular to a method for adjusting the idler rollers of the return belt turning device of an air cushion machine. Background Technology

[0002] An air cushion conveyor, also known as an air cushion belt conveyor, is a type of continuous material conveying equipment commonly used both domestically and internationally. It's a belt conveyor that uses a thin air film to support the conveyor belt and the material on it. It replaces the idlers of a roller conveyor with perforated air chambers. When an air source supplies air with a certain pressure and flow rate into the air chamber, the air escapes through small holes in the chamber, forming a pressurized air film between the conveyor belt and the chamber, supporting the conveyor belt and the material above it. This transforms the roller support arranged at fixed intervals into a continuous air cushion support, changing the roller friction between the conveyor belt and the idlers into fluid friction between the conveyor belt and the chamber using air as the medium. This reduces operating resistance and lowers drive power consumption. Currently, it is used in the conveying of bulk materials such as coal, coke, ore, aluminum powder, and bulk grains.

[0003] The conveyor belt of an air cushion belt conveyor moves in a circular motion during the transport of goods, consisting of a carrying side for transporting materials and a return side for unloading. During normal material transport, the working surface of the belt (i.e., the conveyor belt itself) is on the carrying side, and the non-working surface of the belt is in contact with the air chamber groove on the upper part of the air cushion conveyor. After material unloading, on the return side, the working surface of the belt returns to the lower part, and this working surface is in contact with the lower air chamber groove on the air cushion conveyor.

[0004] Since most of the materials being transported have a certain degree of stickiness, after unloading, no matter whether multi-stage scraper cleaning, roller brush cleaning, or air knife cleaning is used, it is impossible to completely remove the material adhering to the surface of the conveyor belt. Over time, the material adhering to the working surface of the return side of the conveyor belt will accumulate between the conveyor belt and the air cushion machine's air chamber groove, causing wear on the air chamber and the conveyor belt, and even clogging the air holes, causing the air cushion layer to fail and preventing normal material transport. Therefore, it is urgent to solve the problem of air cushion layer failure caused by the inability to thoroughly clean the material adhering to the working surface of the return side of the air cushion machine, as well as the problem of overturning and shifting during the transport process of the conveyor belt. Summary of the Invention

[0005] To address the aforementioned technical problems, the technical solution adopted by this invention is as follows:

[0006] According to one aspect of this application, a method for adjusting the idler rollers of a return conveyor belt turning device for an air cushion machine is provided. The method is applied to the return conveyor belt turning device of an air cushion machine. The return conveyor belt turning device includes a turning idler roller group for turning the conveyor belt. A first distance sensor and a second distance sensor are provided on the outside of the turning idler roller group. Both the first distance sensor and the second distance sensor are located in the opening direction of the conveyor belt within the turning idler roller group. The distance between the first distance sensor and the second distance sensor is less than the opening length of the conveyor belt within the turning idler roller group, so that the first distance sensor and the second distance sensor can collect the distance between the internal area of ​​the conveyor belt and the first distance sensor and the second distance sensor through the opening direction of the conveyor belt.

[0007] The method for adjusting the idler rollers of the return conveyor belt turning device of the air cushion machine includes the following steps:

[0008] Step S100: Real-time acquisition of distance values ​​collected by the first distance sensor and the second distance sensor;

[0009] Step S200: If the distance value collected by the first distance sensor is not within the preset distance range, the turning roller group is rotated in the first direction until the distance value collected by the first distance sensor is within the preset distance range.

[0010] If the distance value collected by the second distance sensor is not within the preset distance range, the turning roller group will be rotated in the second direction until the distance value collected by the second distance sensor is within the preset distance range.

[0011] Wherein, the first direction is the direction in which the first distance sensor moves away from the second distance sensor; the second direction is the direction in which the second distance sensor moves away from the first distance sensor.

[0012] In one exemplary embodiment of this application, the air cushion machine return belt turning device further includes:

[0013] The first belt pressing roller assembly is used to guide the conveyor belt and press and arrange it.

[0014] The second belt pressing roller group is located on one side of the output end of the belt turning idler group and is used to guide and press the conveyor belt after it has been turned over by the belt turning idler group.

[0015] The belt turning idler group is located on one side of the output end of the first belt pressing roller group and is used to turn the conveyor belt after it has been guided by the first belt pressing roller group.

[0016] In one exemplary embodiment of this application, the return belt turning device of the air cushion machine is disposed after the drive roller at the head section of the air cushion machine on the return side and before the tail roller at the tail section of the air cushion machine on the return side.

[0017] In one exemplary embodiment of this application, the first pressure roller assembly includes a first upper pressure roller and a first lower pressure roller. The first upper pressure roller and the first lower pressure roller are located above and below the conveyor belt, respectively, and the lower surface of the first upper pressure roller and the upper surface of the first lower pressure roller are on the same plane, so that after the conveyor belt passes through the first upper pressure roller and the first lower pressure roller, it is output on the plane containing the lower surface of the first upper pressure roller and the upper surface of the first lower pressure roller.

[0018] In one exemplary embodiment of this application, there are several sets of belt-turning idlers, all of which are arranged between the first belt-pressing roller group and the second belt-pressing roller group. The center of each set of belt-turning idlers is located on the plane corresponding to the conveyor belt output by the first belt-pressing roller group, and the vertical planes on which the several sets of belt-turning idlers are located are parallel to each other.

[0019] In one exemplary embodiment of this application, each set of conveyor rollers includes:

[0020] Several belt-turning idlers are evenly distributed so that the outer edges of the several belt-turning idlers form a regular polygon, which is used to guide and move the cylindrical conveyor belt placed at the center of the several belt-turning idlers.

[0021] Several idler brackets, each idler bracket corresponding to a turning idler, to support the corresponding turning idler.

[0022] In one exemplary embodiment of this application, a plurality of idler roller supports are tilted at a preset angle toward the direction of the second pressure roller group, so that the turning idler rollers disposed on the idler roller supports are offset at a preset angle toward the direction of the second pressure roller group.

[0023] In one exemplary embodiment of this application, the second pressure roller assembly includes a second upper pressure roller and a second lower pressure roller. The second upper pressure roller and the second lower pressure roller are respectively located above and below the conveyor belt led out by the turning roller assembly. The lower surface of the second upper pressure roller and the upper surface of the second lower pressure roller are in the same plane as the lower surface of the first upper pressure roller and the upper surface of the first lower pressure roller, so that the conveyor belt led out by the turning roller assembly is output from the plane containing the lower surface of the second upper pressure roller and the upper surface of the second lower pressure roller after passing through the second upper pressure roller and the second lower pressure roller.

[0024] In one exemplary embodiment of this application, the first upper pressure roller, the first lower pressure roller, the second upper pressure roller, and the second lower pressure roller are all fixed to the mounting bracket by reinforcing ribs.

[0025] In one exemplary embodiment of this application, the surfaces of the first upper pressure belt roller, the first lower pressure belt roller, the second upper pressure belt roller, and the second lower pressure belt roller are provided with a rubber coating layer for protecting the conveyor belt.

[0026] The present invention has at least the following beneficial effects:

[0027] The present invention relates to a roller adjustment method for a return conveyor belt turning device of an air cushion machine. This method is applied to the return conveyor belt turning device of an air cushion machine. The device includes a turning roller group for turning the conveyor belt. A first distance sensor and a second distance sensor are disposed on the outer side of the turning roller group, both positioned in the opening direction of the conveyor belt within the turning roller group. The distance between the first and second distance sensors is less than the opening length of the conveyor belt within the turning roller group. This allows the first and second distance sensors to collect the distance from the inner area of ​​the conveyor belt to the first and second distance sensors through the opening direction of the conveyor belt. During the conveyor belt turning operation of the air cushion machine's return conveyor belt turning device, the distance values ​​collected by the first and second distance sensors are acquired in real time. If the distance value collected by the first distance sensor is not within a preset distance range, it indicates that the turning of the conveyor belt has deviated. The deviated direction is the direction in which the first distance sensor moves closer to the second distance sensor. Therefore... The turning roller assembly is rotated in the direction away from the second distance sensor from the first distance sensor, and the distance value collected by the first distance sensor is acquired in real time during the rotation until the distance value collected by the first distance sensor is within a preset distance range. If the distance value collected by the second distance sensor is not within the preset distance range, it indicates that the conveyor belt has shifted in the direction of the second distance sensor towards the first distance sensor. Therefore, the turning roller assembly is rotated in the direction away from the first distance sensor from the second distance sensor, and the distance value collected by the second distance sensor is acquired in real time during the rotation until the distance value collected by the second distance sensor is within the preset distance range. This allows the turning roller assembly of the air cushion machine's return belt turning device to detect the conveyor belt's turning deviation in real time during conveyor belt turning, and to adjust the angle of the turning roller assembly in a timely manner when the conveyor belt turns deviation, ensuring the safe turning operation of the conveyor belt and avoiding abnormal turning angles caused by the conveyor belt turning deviation. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a structural diagram of the air cushion machine return belt turning device provided in an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Side view of the air cushion machine's return conveyor belt turning device at point AA;

[0031] Figure 3 for Figure 1 Side view of the air cushion machine's return conveyor belt turning device at point BB;

[0032] Figure 4 This is a structural diagram of the belt turning roller group of the return belt turning device for an air cushion machine provided in an embodiment of the present invention.

[0033] In the picture:

[0034] 1. First upper pressure roller; 2. First lower pressure roller; 3. Conveyor belt; 4. Belt turning idler; 5. Idler bracket; 6. Second lower pressure roller; 7. Reinforcing rib; 8. Second upper pressure roller; 9. Mounting bracket; 10. First distance sensor; 11. Second distance sensor. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] To address the technical problem in existing technologies where the air cushion layer fails due to the inability to thoroughly clean the adhering material on the return side of the air cushion conveyor belt, this application proposes a return conveyor belt turning device for air cushion machines. Figure 1As shown, the return belt turning device of the air cushion machine includes a first belt pressing roller group, a turning roller group, and a second belt pressing roller group. The first belt pressing roller group is used to guide and move the conveyor belt 3 and to press and arrange it. The turning roller group is located on one side of the output end of the first belt pressing roller group and is used to turn the conveyor belt 3 after it has been guided by the first belt pressing roller group. The second belt pressing roller group is located on one side of the output end of the turning roller group and is used to guide and move the conveyor belt 3 after it has been turned by the turning roller group and to press and arrange it.

[0037] Furthermore, the first pressure roller assembly includes a first upper pressure roller 1 and a first lower pressure roller 2. The first upper pressure roller 1 and the first lower pressure roller 2 are located above and below the conveyor belt 3, respectively. The lower surface of the first upper pressure roller 1 and the upper surface of the first lower pressure roller 2 are on the same plane, so that the conveyor belt 3 is in a flat state after passing through the first upper pressure roller 1 and the first lower pressure roller 2, and is output to the turning roller assembly on the plane containing the lower surface of the first upper pressure roller 1 and the upper surface of the first lower pressure roller 2.

[0038] The second pressure roller assembly includes a second upper pressure roller 8 and a second lower pressure roller 6. The second upper pressure roller 8 and the second lower pressure roller 6 are located above and below the conveyor belt 3 led out by the turning roller assembly, respectively. The lower surface of the second upper pressure roller 8 and the upper surface of the second lower pressure roller 6 are on the same plane as the lower surface of the first upper pressure roller 1 and the upper surface of the first lower pressure roller 2, so that the conveyor belt 3 led out by the turning roller assembly is output from the plane containing the lower surface of the second upper pressure roller 8 and the upper surface of the second lower pressure roller 6 after passing through the second upper pressure roller 8 and the second lower pressure roller 6.

[0039] The first pressure roller group, the turning roller group, and the second pressure roller group are mounted on the mounting bracket 9, and as follows: Figure 1 and Figure 2 As shown, the first upper pressure roller 1, the first lower pressure roller 2, the second upper pressure roller 8, and the second lower pressure roller 6 are all fixed to the mounting bracket 9 by reinforcing ribs 7, so as to effectively enhance the structural stability of the mounting bracket 9 and improve the practicality of the air cushion machine return belt turning device.

[0040] Furthermore, the surfaces of the first upper pressure roller 1, the first lower pressure roller 2, the second upper pressure roller 8, and the second lower pressure roller 6 are provided with a rubber coating layer for protecting the conveyor belt 3. This rubber coating layer can be made of different materials, such as vulcanized rubber or ceramic, depending on the type of material being conveyed on the conveyor belt 3.

[0041] Depending on the stress condition of the conveyor belt 3, different numbers of belt-turning idler groups can be set. Several belt-turning idler groups are set between the first belt-pressing roller group and the second belt-pressing roller group. The center of each belt-turning idler group is located on the plane corresponding to the conveyor belt 3 output by the first belt-pressing roller group. The vertical planes of the several belt-turning idler groups are parallel to each other, so that the conveyor belt 3 maintains the same direction of movement when it moves between the several belt-turning idler groups, maintains the movement state of the conveyor belt 3, and prevents the conveyor belt 3 from running off-center.

[0042] Furthermore, such as Figure 3 and Figure 4 As shown, each set of turning idlers includes several turning idlers 4 and several idler supports 5. The turning idlers 4 are evenly distributed so that their outer edges form a regular polygon, which guides the cylindrical conveyor belt 3 placed at the center of the turning idlers 4. The conveyor belt 3 in the middle of the turning idlers 4 rotates with the rotation of the evenly distributed turning idlers 4, so that the conveyor belt 3 rotates at a certain angle after passing through each set of turning idlers. The conveyor belt 3 passes through the first set of turning idlers (i.e., after the first pressure) before... The upper surface of the conveyor belt 3 after being discharged from the roller group is the non-working surface (i.e., the side that does not contact the material). After being turned over by several sets of turning rollers, the upper surface of the conveyor belt 3 discharged from the last set of turning rollers becomes the working surface. That is, the conveyor belt 3 is turned 180° after passing through several sets of turning rollers. The interval between the several sets of turning rollers and the number of turning rollers 4 included in each set of turning rollers are set according to the specifications of the conveyor belt used by the operator in actual application. The preferred number of turning rollers 4 included in each set of turning rollers is 6.

[0043] Each turning roller 4 is fixed to the mounting bracket 9 by a roller bracket 5, so that the corresponding turning roller 4 is supported by the roller bracket 5.

[0044] In addition, several idler brackets 5 are tilted at a preset angle in the direction of the second pressure roller group so that the turning idler 4 set on the idler bracket 5 is offset at a preset angle in the direction of the second pressure roller group, so as to maintain the torsional torque when the conveyor belt 3 is turned over, and realize the turning function of the conveyor belt 3.

[0045] In practical applications, the return belt turning device of the air cushion machine is located after the drive roller at the head of the machine on the return side and before the tail roller at the tail of the machine on the return side. The conveyor belt 3 is pre-passed sequentially through the first pressure roller group, the turning roller group, and the second pressure roller group, causing the conveyor belt 3 to turn at a certain angle within the turning roller group. When the conveyor belt 3 is in working condition, since the return belt turning device is located after the drive roller at the head of the machine on the return side, the conveyor belt 3 entering the first pressure roller group is a conveyor belt 3 that has already unloaded material and is returning. At this time, since the conveyor belt 3 has already passed the drive roller at the head of the machine on the return side, the lower surface of the conveyor belt 3 is the working surface (i.e., the side carrying the material). After being leveled by the first pressure roller group, the conveyor belt 3 moves to... In the belt turning idler group, after passing through several belt turning idler groups, the conveyor belt 3 is turned 180°. At this time, the working surface of the conveyor belt 3 led out by the last belt turning idler group is turned to the upper surface of the conveyor belt 3. After being flattened by the second pressure roller group, it is led out, so that the surface of the conveyor belt 3 in contact with the lower air chamber groove of the air cushion machine is a non-working surface. After passing through the lower air chamber groove of the air cushion machine, it moves to the air cushion machine return belt turning device before the tail roller at the tail end of the machine on the return side of the air cushion machine. The air cushion machine return belt turning device turns the conveyor belt 3 another 180°. At this time, the upper surface of the conveyor belt 3 before the tail roller at the tail end of the machine on the return side of the air cushion machine is a non-working surface. After passing the tail roller at the tail end of the machine on the return side of the air cushion machine, the conveyor belt 3 enters the bearing side of the air cushion machine and continues to transport materials.

[0046] The air cushion machine return belt turning device of the present invention is installed on the return side of the air cushion machine's conveyor belt after material unloading. It includes a first belt pressing roller group, a turning roller group, and a second belt pressing roller group. The first belt pressing roller group guides and presses the conveyor belt. The turning roller group is located on one side of the output end of the first belt pressing roller group and is used to turn the conveyor belt, which has been guided by the first belt pressing roller group, overturn it. The second belt pressing roller group is located on one side of the output end of the turning roller group and is used to guide the conveyor belt, which has been turned over by the turning roller group, to... The conveyor belt is then pressed and adjusted so that after being guided by the first pressing roller group, flipped by the turning roller group, and guided by the second pressing roller group, the conveyor belt entering the return belt turning device of the air cushion machine is turned 180°. This causes the working surface of the conveyor belt to be turned to the top, so that the surface of the conveyor belt in contact with the lower air chamber groove of the air cushion machine is a clean, non-working surface that has not been in contact with materials. This ensures the safe and continuous operation of the air cushion machine and solves the problem of air cushion layer failure caused by the inability to completely clean the material adhering to the working surface of the return belt of the air cushion machine.

[0047] In addition, each set of turning idlers corresponds to a set of distance sensors. Specifically, a first distance sensor 10 and a second distance sensor 11 are provided on the outside of each set of turning idlers, and the first distance sensor 10 and the second distance sensor 11 of the same set are both located in the opening direction of the conveyor belt 3 within the corresponding turning idler set, such as... Figure 3 As shown, the distance between the first distance sensor 10 and the second distance sensor 11 is less than the opening length of the conveyor belt 3 within the corresponding turning roller group. This allows the first distance sensor 10 and the second distance sensor 11 to collect the distance between the inner area of ​​the conveyor belt 3 and the first distance sensor 10 and the second distance sensor 11 through the opening direction of the conveyor belt 3. Since the rotation angle of the conveyor belt 3 within each turning roller group is different, the opening direction of the conveyor belt 3 within each turning roller group is also different. When the turning angle of the conveyor belt 3 is normal, i.e., no offset occurs, the corresponding first distance sensor 10 and the second distance sensor 11 will both collect the distance between the innermost side of the conveyor belt 3 and the first distance sensor 10 and the second distance sensor 11. Figure 3 This is a schematic diagram showing the conveyor belt 3 when it is not deviated. However, if the conveyor belt 3 in the turning idler group deviates, it will cause the conveyor belt 3 to deviate from the normal turning angle, which may prevent the conveyor belt 3 from being conveyed to the second pressure roller group at the preset angle, affecting the normal turning of the conveyor belt 3. Therefore, this application proposes a method for adjusting the idler rollers of the return belt turning device of the air cushion machine, which specifically includes the following steps:

[0048] Step S100: Real-time acquisition of distance values ​​collected by the first distance sensor 10 and the second distance sensor 11;

[0049] Step S200: If the distance value collected by the first distance sensor 10 is not within the preset distance range, the turning roller group is rotated in the first direction until the distance value collected by the first distance sensor 10 is within the preset distance range.

[0050] If the distance value collected by the second distance sensor 11 is not within the preset distance range, the turning roller group will be rotated in the second direction until the distance value collected by the second distance sensor 11 is within the preset distance range.

[0051] Wherein, the first direction is the direction in which the first distance sensor 10 moves away from the second distance sensor 11 (i.e., Figure 3 The clockwise direction is the direction in which the second distance sensor 11 moves away from the first distance sensor 10 (i.e., the direction of clockwise movement). Figure 3 (Counterclockwise direction in the middle).

[0052] When the distance value collected by the first distance sensor 10 is not within the preset distance range, it indicates that the conveyor belt is moving in the 3rd direction. Figure 3 If the counterclockwise rotation angle shifts, causing the distance value collected by the first distance sensor 10 to shorten, then the turning roller assembly will be moved towards... Figure 3 The conveyor belt rotates clockwise. When the distance value collected by the second distance sensor 11 is not within the preset distance range, it indicates that the conveyor belt is rotating in the wrong direction. Figure 3 If the clockwise rotation of the conveyor belt shifts at an angle, causing the distance value collected by the second distance sensor 11 to shorten, then the conveyor belt idler group will be moved towards... Figure 3 The conveyor belt 3 is rotated counterclockwise to keep its flipping angle within the normal flipping angle. When the conveyor belt is flipped by the flipping idler group of the air cushion machine return belt flipping device, the flipping offset of the conveyor belt can be detected in real time by the idler adjustment method of the air cushion machine return belt flipping device of this application. When the conveyor belt flips offset, the angle of the flipping idler group is adjusted in time to ensure the safe flipping operation of the conveyor belt and avoid abnormal flipping angle caused by the flipping offset of the conveyor belt.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for adjusting the idler rollers of a return conveyor belt turning device for an air cushion machine, characterized in that, This invention relates to a return belt turning device for an air cushion machine. The return belt turning device includes several turning roller groups. The turning roller groups are used to turn the conveyor belt (3). A first distance sensor (10) and a second distance sensor (11) are provided on the outside of each turning roller group. The first distance sensor (10) and the second distance sensor (11) are both located in the opening direction of the conveyor belt (3) in the corresponding turning roller group. The opening direction of the conveyor belt (3) in each turning roller group is different. The distance between the first distance sensor (10) and the second distance sensor (11) is less than the opening length of the conveyor belt (3) in the turning roller group, so that the first distance sensor (10) and the second distance sensor (11) can collect the distance between the internal area of ​​the conveyor belt (3) and the first distance sensor (10) and the second distance sensor (11) through the opening direction of the conveyor belt (3). The method for adjusting the idler rollers of the return conveyor belt turning device of the air cushion machine includes the following steps: Step S100: Real-time acquisition of distance values ​​collected by the first distance sensor (10) and the second distance sensor (11); Step S200: If the distance value collected by the first distance sensor (10) is not within the preset distance range, the turning roller group is rotated in the first direction until the distance value collected by the first distance sensor (10) is within the preset distance range. If the distance value collected by the second distance sensor (11) is not within the preset distance range, the turning roller group will be rotated in the second direction until the distance value collected by the second distance sensor (11) is within the preset distance range. Wherein, the first direction is the direction in which the first distance sensor (10) moves away from the second distance sensor (11); the second direction is the direction in which the second distance sensor (11) moves away from the first distance sensor (10).

2. The method according to claim 1, characterized in that, The air cushion machine return conveyor belt turning device also includes: The first pressure roller group is used to guide and move the conveyor belt (3) and to press and arrange it. The second pressing roller group is located on one side of the output end of the turning roller group and is used to guide and press the conveyor belt (3) after it has been turned over by the turning roller group. The turning roller group is set on one side of the output end of the first pressing roller group and is used to turn the conveyor belt (3) after it has been guided by the first pressing roller group.

3. The method according to claim 2, characterized in that, The return belt turning device of the air cushion machine is located after the drive roller at the head of the machine on the return side of the air cushion machine, and before the tail roller at the tail of the machine on the return side of the air cushion machine.

4. The method according to claim 3, characterized in that, The first pressure roller assembly includes a first upper pressure roller (1) and a first lower pressure roller (2). The first upper pressure roller (1) and the first lower pressure roller (2) are located above and below the conveyor belt (3), respectively. The lower surface of the first upper pressure roller (1) and the upper surface of the first lower pressure roller (2) are on the same plane, so that after the conveyor belt (3) passes through the first upper pressure roller (1) and the first lower pressure roller (2), it is output from the plane containing the lower surface of the first upper pressure roller (1) and the upper surface of the first lower pressure roller (2).

5. The method according to claim 4, characterized in that, The number of the belt turning idler groups is several, and the several belt turning idler groups are all arranged between the first belt pressing roller group and the second belt pressing roller group. The center of each belt turning idler group is located on the plane corresponding to the conveyor belt (3) output by the first belt pressing roller group, and the vertical planes where the several belt turning idler groups are located are parallel to each other.

6. The method according to claim 5, characterized in that, Each of the aforementioned conveyor belt idler sets includes: A plurality of belt-turning idlers (4) are evenly distributed so that the outer edges of the plurality of belt-turning idlers (4) form a regular polygon, which is used to guide the conveyor belt (3) which is cylindrical and placed at the center of the plurality of belt-turning idlers (4). A plurality of roller brackets (5), each roller bracket (5) corresponding to one of the turning rollers (4) to support the corresponding turning roller (4).

7. The method according to claim 6, characterized in that, Several of the idler brackets (5) are tilted at a preset angle toward the direction of the second pressure roller group, so that the turning idler (4) set on the idler bracket (5) is offset at a preset angle toward the direction of the second pressure roller group.

8. The method according to claim 7, characterized in that, The second pressure roller group includes a second upper pressure roller (8) and a second lower pressure roller (6). The second upper pressure roller (8) and the second lower pressure roller (6) are located above and below the conveyor belt (3) led out by the turning roller group, respectively. The lower surface of the second upper pressure roller (8) and the upper surface of the second lower pressure roller (6) are on the same plane as the lower surface of the first upper pressure roller (1) and the upper surface of the first lower pressure roller (2), so that the conveyor belt (3) led out by the turning roller group is output from the plane containing the lower surface of the second upper pressure roller (8) and the upper surface of the second lower pressure roller (6) after passing the second upper pressure roller (8) and the second lower pressure roller (6).

9. The method according to claim 8, characterized in that, The first upper pressure roller (1), the first lower pressure roller (2), the second upper pressure roller (8) and the second lower pressure roller (6) are all fixed to the mounting bracket (9) by reinforcing ribs (7).

10. The method according to claim 9, characterized in that, The roller surfaces of the first upper pressure roller (1), the first lower pressure roller (2), the second upper pressure roller (8) and the second lower pressure roller (6) are provided with a rubber coating layer for protecting the conveyor belt (3).

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