Example 1
 like figure 1 , 2 , 3, 4, 5, 6, 7 shows a kind of unpowered roller sorting chute, which includes a support foot 3, a first track arranged above the support foot 3 and extending in parallel and spaced in the horizontal projection direction 1 and the second track 2, and the axle 4 with a plurality of rollers 5 sleeved in the space between the first track 1 and the second track 2.
 The first track 1 and the second track 2 include a linearly extending lead-in section 6 arranged from upstream to downstream and a center of curvature ( figure 2 The middle O point) is a circular arc-shaped turning section 7 that is curved around the circumference. At the same time, in this embodiment, the first track 1 and the second track 2 also include a straight section 8, and the straight section 8 extends linearly from the downstream end of the lead-in section 6 to the upstream end of the turning section 7, that is, connected between the lead-in section 6 and the turning section between 7.
 Please refer to figure 2 , in the horizontal projection direction, the second track 2 is located between the first track 1 and the center of curvature, that is, the second track 2 with a smaller diameter and the first track 1 with a larger diameter are concentrically curved.
 In actual application scenarios, multiple sorting slides are generally distributed on the sides of the active conveyor belt and sorting conveyor line in a fishbone shape, and pass through the guide rails located on the conveyor belt and sorting conveyor line when conveying packages. The baffle and other structures guide the package into the sorting chute and send it out. Further, because the package enters the sorting chute from the conveyor belt with active power and the sorting conveyor line, the kinetic energy generated by the speed provided by the active power and the guiding effect of the baffles and other structures that guide the package make it enter the sorting chute. The packages in the sorting chute have a tendency to move along the extension direction of the baffle structure and form a centrifugal force away from the extension track of the sorting chute. The direction of the centrifugal force is not necessarily the same as the extension direction of the introduction section 6 and the subsequent straight section 8 It may cause the package to come out of this sorting chute, please refer to Figure 4 , in the vertical section, the vertical height of the second rail 2 is set lower than the first rail 1 through the support of the legs 3 and the connection line between the two forms an included angle of θ° with the horizontal plane, in the longitudinal section direction Above, the plane formed by the rollers 5 to support the package is an inclined plane where the connection line between the first rail 1 and the second rail 2 is located. Furthermore, on the one hand, the packages entering the sorting chute have a tendency to be blocked by the inclined plane due to centrifugal force and prevent the packages from falling out; The gravitational decomposition of the package produces a horizontal component force mgsinθ extending horizontally in the direction of the second track 2 . This further horizontal component provides a centripetal force on the turning section 7 that prevents the parcels from being thrown out of the sorting chute due to inertia during turning.
 In this embodiment, the connecting line between the upstream end and the downstream end of the first rail 1 and the second rail 2 forms an included angle of θ° with the horizontal plane. Furthermore, the downward inclination angle of the overall sorting chute from the upstream end to the downstream end is provided, so that the centrifugal force of the package after entering the sorting chute is decomposed by the space of the sorting chute formed by the above-mentioned two θ° angles, and is combined with the parcel. The combination of its own gravity forms the initial speed of its movement along the extension direction of the sorting chute, and then automatically moves downstream, and is set to be the same as the inclination angle between the first track 1 and the second track 2, which makes the overall structure design simpler. It is easy to install and debug, and the installation and setting of the overall inclination and the inclination between the tracks are more convenient when the multi-segment straight section 8 and the steering section 7 are used to connect.
 In this embodiment, the included angle θ° is realized by setting different heights of the legs 3 supported under the first rail 1 and the second rail 2 . In this embodiment, the included angle θ° is set to 8°. Tests have shown that when the included angle is 6° to 10° and preferably 8°, on the one hand, the gravitational component force mgsinθ that can be wrapped is greater than the inertia and sum of the roller and the axle. The friction force realizes the downstream movement without power drive; on the other hand, the acceleration of the package movement provided by the gravitational force will not be too large to cause the inertia after entering the turning section 7 to make the package leave the sorting chute; on the other hand, this An inclination angle is such that the gravitational force of the lateral inclination wrapped on the lead-in section 6 and the straight section 8 will not be greater than the frictional force provided by the roller 5, that is, it will not fall laterally.
 In this embodiment, the axles 4 located in the turning section 7 are distributed linearly radially outward from the center of curvature, so that the number of rollers contacting the bottom of the package entering the turning section 7 decreases radially outward to balance the radial The balance between the line speed and the angular speed in the direction prevents the package from spinning and rolling. At the same time, the direction in which the rollers 5 on each axle 4 guide the package is the tangential direction on the circumference around the center of curvature, so that the rollers 5 will guide the package to achieve a stable turning and moving path when the package passes.
 Please refer to Figure 5 , in this embodiment, the roller 5 is a Fulai wheel, and the rollers 5 on the adjacent axles 4 are arranged in a staggered manner, so that the gap between the rollers 5 of the adjacent axles 4 is reduced, and the adjacent axles 4 can also be more Small spacing settings, so that small, soft packages can be conveyed with smaller gaps.
 In this embodiment, the extending length of the first track 1 in the upstream direction of the lead-in section 6 is smaller than the extending length of the second track 2, and a connecting plate 61 is connected between the upstream ends of the first track 1 and the second track 2, and is located in the lead-in section. The two ends of the axle 4 of 6 are respectively connected to the connecting plate 61 and the second rail 2 .
 Because in the actual application scenario, the sorting chute is distributed in a fishbone shape. At this time, it is necessary to set the upstream end of the introduction section 6 connected to the conveyor belt and the sorting conveyor line to have a beveled edge (ie, the structure of the connecting plate 61) to accept the packages introduced from the conveyor belt and the sorting conveyor line. The angle of the hypotenuse on the lead-in section 6 is determined by the angle and space required in the actual application scenario, that is, the first track 1 and the second track 2 in the lead-in section 6 realize different angles of the connecting plate 61 through different length differences . Therefore, on the horizontal projection plane, the lead-in section 6 can have a trapezoidal shape with the first track 1 shorter and the second track 2 longer. In extreme cases, the length of the first track 1 can be set to 0 to form a triangular lead-in section 6 .
 Please refer to figure 1 , the horizontal projection shape of the introduction section 6 in this embodiment is a triangle, and the inclined surface of the triangle is formed by the connecting plate 61 . When the package enters the overall sorting chute through the connecting plate 61, the number and contact time of the rollers 5 at the bottom of the package are gradually increasing and early in the direction from the first track 1 to the second track 2. At this time, the bottom of the package is presented. The part close to the first track 1 receives less friction and damping of the roller 5 and has a large acceleration, while the part close to the second track 2 receives more friction and damping from the roller 5 and has a small acceleration. In the above case, the package as a whole exhibits a rotation trend from the upstream side part close to the first track 1 to the second track 2 side on the horizontal projection, which makes the package run on the sorting slide as a whole. The downstream side of the package (that is, the front end moving downstream) can better maintain the state of its trajectory moving along the extension direction of the sorting rail, reduce the possible trajectory deviation caused by the roll of the front end, and ensure good transportation. Effect.
 In this embodiment, the diameters of the rollers 5 located on the same axle 4 are the same. Also please refer to Image 6 , in this embodiment, the circumferential surface of the roller 5 is parallel to the circumferential surface of the axle 4 to which it is mounted. Therefore, the enveloping surface of the circumferential surface of each roller 5 on the same axle 4 is a cylindrical surface whose axis coincides with the axle 4, thereby having a larger contact area and supporting effect for the upper wrapping to achieve a stable guiding and conveying effect.