JPH0730215U - Spiral conveyor tension adjustment device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a spiral conveyor tension adjusting device that reduces the frictional resistance of a curved guide that travels while maintaining the curved running path horizontally, and that is easy to adjust after assembly. Especially. [Structure] The spiral track 1 has a pair of straight guides 5.
In a spiral conveyor tension adjusting device which is divided into a pair of curved guides 6 and moves the curved guides 6 to adjust the tension of the belt, the spiral conveyor tension adjusting device is provided at the connecting portion between the straight guides 5 and the curved guides 6. The first bearing 32, which slidably holds the straight shaft 31 provided between the pedestals 21 and 22, and the pedestal 23, which is arranged radially inside and outside the pair of curved guides 6, are provided. The present invention is characterized by including a second bearing 32 that slidably holds the straight shaft 31 that is formed, and a biasing unit that biases the curved guide 6 toward the stationary straight guide 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tension adjusting device for a spiral conveyor that does not use a drive drum, and more specifically, reduces the frictional resistance of a curved guide that runs while maintaining the curved guide horizontally, and facilitates adjustment after assembly. The spiral conveyor tension adjusting device.

[0002]

[Prior art]

 As shown in FIG. 5, there is a drumless spiral conveyor that travels a belt without using a driving drum as a spiral conveyor that conveys a conveyed object in a spiral shape. In such a conveyor, a spirally arranged runway 1 is arranged. A belt 2 formed in an endless shape so as to be bendable is arranged on the track 1 so as to run. The belt 2 is configured to be driven and driven by a driving device 3 driven by a motor 4 via a sprocket or a chain with an attachment. Further, as shown in FIG. 5, when the traveling distance of the belt 2 is long, a plurality of driving devices 3 are provided so as to apply a driving force to the belt 2 of the track 1 of each stage, whereby the belt 2 is provided. The driving force applied to the belt is suppressed below the maximum allowable stress to prevent damage to the belt.

However, when a plurality of drive devices 3 are provided in this way, the belt 2 runs while repeating tension and relaxation due to the difference in the load applied to each motor 4. As a result, it is a factor that induces the disturbance of the conveyed article (not shown) placed on the belt 2. In particular, an abnormally high tension may be applied to the belt 2 instantaneously or, on the contrary, the belt 2 may be significantly loosened. As a result, the belt 1 and the belt 2 may be adversely affected.

In order to solve such a problem, conventionally, by combining a servo motor and an arithmetic unit, the torque generated in each motor 4 is detected, and the output of each motor 4 is adjusted. There is a method of keeping the driving force applied to the second constant. However, this method of combining the servo motor and the arithmetic unit causes a cost increase, and is not applicable to all systems, and it cannot be said that it is suitable for solving the above-mentioned problems. .

From such a point, conventionally, as a method for solving the above problem, there is a method as shown in FIGS. 6 and 7. As shown in FIG. 7, the track 1 is divided into a pair of straight guides 5 forming a straight track portion and a pair of curved guides 6 forming a curved track portion. As shown in FIG. 6, a pair of mounts 8 and 8 are provided on the inside and outside of the curved guides 6 in the radial direction, and a rail 7 is bridged between the mounts 8 and 8.

Further, the pair of curved guides 6 and 6 are provided with a pair of plate-shaped brackets 6a and 6a extending downward, respectively. A pair of guides 9 and 9 are provided between the brackets 6a and 6a, and a plurality of wheels 10 that slide on the rail 7 are provided on the pair of guides 9 and 9. As a result, the pair of curved guides 9, 9 are moved in the radial direction by the wheels 10 sliding on the rail 7.

Further, holding arms 11, 11 for holding the curved guide 6 are provided obliquely with respect to the radial direction of the curved guide 6. Further, a plurality of springs 12 are provided for biasing the pair of curved guides 6 in the direction away from the center point thereof.

With this configuration, when a high tension is applied to the belt 2 running on the curved guide 6, the curved guide 6 resists the urging force of the spring 12 and is straight. When the tension applied to the belt 2 is weakened while being moved in the direction of approaching the id 5, the curved guide 12 is moved in the direction away from the straight guide 5 by the urging force of the spring 12, whereby the belt The tension applied to 2 is kept constant.

[0009]

However, the wheel 10 that slides on the rail 7 is mounted so as to be inclined with respect to the radial load applied to the curved guide 6. Therefore, there is a problem that it is difficult to determine the mounting position of the wheel 10 and adjust the wheel after assembly.

Further, since the holding arm 11 described above is provided obliquely with respect to the radial direction of the curved guide 6, a wheel is provided on the holding arm 11 to reduce the frictional resistance of the curved guide 6. However, there is no other choice but to slide the curved guide 6 on the holding arm 11, and as a result, there is a problem that the frictional resistance of the curved guide 6 to the holding arm 11 is large.

The object of the present invention was made in view of the above-mentioned circumstances, and it is possible to reduce the frictional resistance of a curved guide that runs while maintaining the curved guide horizontally. Another object of the present invention is to provide a spiral conveyor tension adjusting device that can be easily adjusted after assembly.

[0012]

[Means for Solving the Problems]

 In order to achieve this object, the spiral conveyor tension adjusting device according to the present invention has a spiral runway divided into a pair of straight guides and a pair of curved guides. In a spiral conveyor tension adjusting device that adjusts the tension of a belt by moving a curved guide in the extension direction, a straight belt that is installed between the frames installed near the connection between the straight guide and the curved guide. A linear bearing that holds the shaft slidably and is installed between the first bearing attached to the ends of the curved guides and the pedestals arranged inside and outside in the radial direction of the pair of curved guides. And a second bearing attached to the middle portion of the outer curved guide, and a biasing means for biasing the curved guide toward the stationary straight guide. It is characterized by.

[0013]

[Action]

 As described above, according to the present invention, since the straight shaft between the mounts is slidably held by the first and second bearings, the conventional holding arm for holding the curved guide is provided. Even if the curved guide is not required, the curved guide can be maintained horizontally, and the first and second bearings can move the curved guide according to the tension applied to the belt. Therefore, the tension of the belt can be kept constant while reducing the frictional resistance of the curved guide.

Further, the first and second bearings can receive not only radial load and anti-radial load but also loads in all directions other than the axial direction. Therefore, the first and second bearings and the curved guide Since adjustment of the clearance between and is unnecessary or easy, adjustment after assembly becomes easy.

[0015]

【Example】

 Hereinafter, a spiral conveyor tension adjusting device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a spiral conveyor tension adjusting device according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the curved guide shown in FIG. 3 is a plan view showing a connecting portion between the straight guide and the curved guide shown in FIG. 1, and FIG. 4 is a side view showing a connecting portion between the straight guide and the curved guide provided in a plurality of stages. is there.

As shown in FIG. 1, in this embodiment, a straight runway portion having a fixed runway and a movable curved runway portion are provided. The straight runway portion and the curved runway portion are provided. Each comprises a pair of straight guides 5 and a pair of curved guides 6. A pair of mounts 21 are provided on both sides of the ends of the pair of straight guides 5. Further, a pair of mounts 22 are provided on both sides of both ends of the pair of curved guides 6, respectively. A spring 12 is bridged between the pedestal 22 and the end of the curved guide 6, so that the curved guide 6 extends in the extending direction of the linear guide 6 and the linear guide 6. Biased away from. Further, a pair of pedestals 23 are also provided on the outer side and the inner side in the radial direction at the intermediate portions of the pair of curved guides 6.

First and second linear motion systems A and B are provided between the mounts 21 and 22 and between the pair of mounts 23 and 23, respectively. The first and second linear motion systems A and B are provided with a linear shaft 31 spanned between the mounts 23 and 23. As shown in FIGS. 3 and 4, a block 32 (first and second bearings) including a linear ball bearing 32a is slidably provided on the straight shaft 31. A pivot 33 is provided on the block 32 (first and second bearings), and the pivot 33 is attached to a bracket 34 provided on the curved guide 6. Although the second linear motion system B provided between the mounts 23 and 23 has two blocks 32 (second bearings), the first linear motion system A between the mounts 21 and 22 is used. Has one block 32 (first bearing) provided on a bracket 35 provided at the end of the curved guide 6.

In the spiral conveyor tension adjusting device configured as described above, when a high tension is applied to the belt 2 running on the curved guide 6, the curved guide 6 resists the urging force of the spring 12. As a result, the blocks 32 (first and second bearings) of the first and second linear motion systems A and B move in the direction of approaching the guide 5 while sliding on the linear shaft 31. On the other hand, when the tension applied to the belt 2 is weakened, the curved guide 12 moves the blocks 32 (first and second bearings) of the first and second linear motion systems A and B by the urging force of the spring 12. While sliding on the straight shaft 31, it is moved in a direction away from the straight guide 5. By these, the tension applied to the belt 2 is adjusted to be constant, and the belt 2 is not excessively strained or relaxed.

Further, since the curved guide 6 is maintained horizontally by the first and second linear motion systems A and B, a holding arm 11 for holding the curved guide 6 is provided as in the conventional case. Even without the curved guide 6, the curved guide 6 can be maintained horizontally.

Therefore, the first and second linear motion systems A and B can move the curved guide 6 in accordance with the tension applied to the belt 2 while maintaining the curved guide 6 in a horizontal position. The tension of the belt can be kept constant while reducing the frictional resistance of the linear guide 6.

Further, since the block 32 (first and second bearings) incorporating the linear ball bearing 32a is configured to be slidable on the straight shaft 31, not only the radial load and the anti-radial load but also the directions other than the axial direction Since the load can be received in all directions, and the clearance between the curved guide 6 and the straight shaft 31 is unnecessary or easy, the adjustment after assembly becomes easy.

Further, in order to suppress the increase in tension in the curved guide 6 as small as possible, the drive device 3 having the motor 4 is arranged as close to the inlet of the curved guide 6 as possible. Furthermore, as shown in FIG. 4, the track of the drumless spiral is arranged in a plurality of stages, and the first linear motion system A is provided in each stage. Further, the use of the spiral conveyor according to this embodiment is the same as the conventional one.

It should be noted that the present invention is not limited to the above-mentioned embodiments and can be variously modified.

[0025]

[Effect of device]

 As described above, in the present invention, since the straight shaft between the mounts is slidably held by the first and second bearings, the conventional holding arm for holding the curved guide is provided. Even if the curved guide is not provided, the curved guide can be maintained horizontally, and the first and second bearings can move the curved guide according to the tension applied to the belt. Therefore, the tension of the belt can be kept constant while reducing the frictional resistance of the curved guide. In addition, the first and second bearings can receive not only radial load and anti-radial load but also loads in all directions other than the axial direction. Therefore, the clearance between the first and second bearings and the curved guide can be reduced. Since adjustment is unnecessary or easy, adjustment after assembly becomes easy.

[Brief description of drawings]

FIG. 1 is a perspective view of a spiral conveyor tension adjusting device according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the curved track portion shown in FIG. 1 as viewed from below.

FIG. 3 is a plan view showing a connecting portion between the straight track portion and the curved track portion shown in FIG.

FIG. 4 is a side view showing a connecting portion between a straight track portion and a curved track portion provided in a plurality of stages.

FIG. 5 is a perspective view of a conventional drumless spiral conveyor.

FIG. 6 is an enlarged perspective view of a curved runway portion of a conventional spiral conveyor tension adjusting device as viewed from below.

FIG. 7 is a perspective view of a conventional spiral conveyor tension adjusting device.

[Explanation of symbols]

 1 runway 2 belt 5 straight guide 6 curved guide 12 spring (biasing means) 21 mount 22 mount 23 mount 31 straight shaft 32 block (first and second bearings) 32a linear ball bearings A, B first and first 2 linear motion system

Claims (1)

[Scope of utility model registration request] 1. A spiral runway is divided into a pair of straight guides and a pair of curved guides, and the tension of the belt is moved by moving the curved guides in the extending direction with respect to a stationary straight guide. In the tension adjustment device for the spiral conveyor that adjusts the linear guide, the straight shaft that is installed between the mounts provided near the connection between the straight guide and the curved guide is slidably held, and the end of the curved guide is Mounted on the first bearing and a pair of curved guides slidably holding a straight shaft provided between pedestals arranged inside and outside in the radial direction, and the middle of the outer curved guides. A spiral conveyor tension adjusting device, comprising: a second bearing attached to the section; and a biasing unit that biases the curved guide toward the stationary straight guide.