A rabbit running device for transporting target and a rabbit running design method

Abstract

The invention discloses a rabbit running device for transporting target pieces and a rabbit running design method. The device comprises a rabbit running device arranged in a curved tube-shaped transmission runway. The two ends of the cross section on the axial center line of the running device are respectively a cylinder with a set height, and two relatively long inwardly concave arcs are formed between the two cylinders. The two inwardly concave arcs are symmetrically arranged along the axial center line of the rabbit running device. The method comprises: setting a limit gap value and an initial gap value; determining a far end radius and a near end radius of the curved tube-shaped transmission runway, and a diameter of the rabbit running device; determining the height of the cylinders at both ends and the length of the rabbit running device according to the diameter; determining the curvature range of the rabbit running device according to the length of the rabbit running device, the height of the cylinders at both ends and the limit gap value. The invention reduces the cost of plant construction: the required turning radius is reduced by designing an arc on the outer surface of the rabbit running device, and the middle section radius of the curved tube transmission pipeline is reduced from 4114 mm to within 2000 mm.

Description

Technical Field

[0001] The invention belongs to the technical field of medical isotopes, and in particular relates to a rabbit-running device for transporting a target and a rabbit-running design method. Background Art

[0002] Medical radioactive isotopes are obtained by bombarding various target materials with high-energy beams to obtain target nuclides. Target bombardment needs to be carried out in a target station that can provide a vacuum environment. The target station is a target that is fixed together with a cooling device to form a target. The target is placed in a rabbit. The rabbit is transferred to the target chamber by a hot chamber through a transmission pipeline. The transmission pipeline consists of straight lines and curves. The target is then grabbed by a manipulator at the other end of the transmission pipeline and sent to the target station for irradiation. After irradiation, it is returned to the hot chamber for the next process.

[0003] When the rabbit is placed in a curved transmission pipe for transmission, pneumatic transmission is mostly used to transmit the target. Before transmission, the target must be placed in the target placement slot in the rabbit, and then the rabbit tube is ventilated so that the rabbit is transported from the hot chamber end of the rabbit tube to the target chamber end under the push of gas, or from the target chamber end to the hot chamber end after irradiation. The transmission channel for transporting the rabbit from the hot chamber end of the rabbit tube to the target chamber is generally composed of straight lines and curves, and the cylindrical rabbit lies horizontally in the transmission pipe.

[0004] The difficulty of the rabbit running design lies in the contradiction between the plant construction cost of the target room and the hot room and the size of the rabbit running. The size of the rabbit running is proportional to the turning radius of the rabbit running tube. On the one hand, due to the limitation of the site, the turning radius of the rabbit running tube (also known as the curved tube transmission runway) is required to be as small as possible. On the other hand, the target size is required to be larger. When the target size is larger, the rabbit running size is also larger, and the required turning radius of the rabbit running tube is larger. Generally, in order to consider the construction cost, the design of the target room and the hot room will not leave too much space while meeting the requirements of various indicators, which limits the maximum turning radius of the rabbit running tube. Therefore, in order to enable the rabbit running to carry the target smoothly through the rabbit running tube bend and reduce the cost of plant construction, it is necessary to propose a reasonable and feasible design method for the rabbit running design. Summary of the invention

[0005] The present invention provides a rabbit running device and a rabbit running design method for transporting targets, aiming to solve the problem that the design of the target chamber and the hot chamber does not leave too much space due to construction cost considerations in the prior art, thus limiting the maximum turning radius of the rabbit running tube.

[0006] The present invention proposes the following technical solutions to solve the technical problems:

[0007] A rabbit running device for transporting target pieces, the rabbit running device is arranged in a curved tubular transmission runway, and the rabbit running device is transported from one end of the curved tubular transmission runway to the other end by gas; the rabbit running device is characterized in that: the two ends of the cross-section on the axial center line of the rabbit running device are respectively a cylinder with a set height, and the middle of the two cylinders are two relatively long inwardly concave arcs, and the two inwardly concave arcs are symmetrically arranged along the axial center line of the rabbit running device; the curvature range of the two inwardly concave arcs is based on the gap between the rabbit running device and the curved tubular transmission runway being not less than a limit gap value, and the limit gap value refers to the gap between the middle arc area of ​​the rabbit running device excluding the cylindrical setting areas at the two ends and the curved tubular transmission runway.

[0008] Furthermore, the diameter calculation method of the rabbit running device is: diameter = distal radius of the curved tube transmission runway - proximal radius of the curved tube transmission runway - initial gap value; the length calculation method of the rabbit running device is: when the diameter of the rabbit running device is fixed, a certain space can be reserved at both ends of the rabbit running device to install other accessories, and the curvature range of the middle area can ensure that the gap between the rabbit running device and the transmission tube is not less than the limit gap value. The length is designed based on the size of the target piece so that it can be completely placed in the rabbit running device. The initial gap value refers to the gap between the rabbit running device including the cylindrical areas at both ends of the rabbit running device and the curved tube transmission runway.

[0009] Furthermore, the limit gap value is 1.5 mm.

[0010] Furthermore, the initial gap value is 2 mm.

[0011] Furthermore, when the distal radius of the curved pipe transmission track is R2048 mm, the proximal radius is R1952 mm, and the initial gap value is 2 mm, the diameter of the rabbit running device = R2048 mm - R1952 mm - 2 mm = 94 mm.

[0012] Furthermore, when the diameter of the rabbit running device = 94mm, the length of the rabbit running device is 234mm; the heights of the cylinders at both ends are 11mm respectively, and the length of the arc concave in the middle = 234mm-2*11mm=212mm.

[0013] Furthermore, when the distal radius of the curved tubular transmission track is R2048mm and the proximal radius is R1952mm, the curvature range of the two inwardly concave arcs of the rabbit running device is R1954mm-R1970mm. Within this range, the gap between the rabbit running device and the curved tubular transmission track is not less than the limit gap value of 1.5mm.

[0014] Further, when the distal radius of the curved tubular transmission track is R2048 mm, the proximal radius is R1952 mm, and the curvature of the two inwardly concave arcs of the rabbit running device is R1954 mm, the gap between the rabbit running device and the curved tubular transmission track is 1.53 mm.

[0015] Further, when the distal radius of the curved tubular transmission track is R2048 mm, the proximal radius is R1952 mm, and the curvature of the two inwardly concave arcs of the rabbit running device is R1970 mm, the gap between the rabbit running device and the curved tubular transmission track is 1.51 mm.

[0016] A method for designing a running rabbit device for transporting a target, wherein the method comprises the following steps:

[0017] Step 1: Set the limit gap value and the initial gap value;

[0018] Step 1, determining the far end radius and the near end radius of the curved tube transmission runway;

[0019] Step 2: determining the diameter of the rabbit running device according to the distal radius and the proximal radius;

[0020] Step 3: Determine the height of the cylinders at both ends and the length of the rabbit running device according to the diameter of the rabbit running device;

[0021] Step 4: Determine the curvature range of the running rabbit device according to the length of the running rabbit device, the height of the cylinders at both ends of the running rabbit device, and the limit gap value.

[0022] Advantages and effects of the present invention

[0023] 1. The present invention reduces the cost of plant construction: by designing an arc on the outer surface of the running rabbit, the required turning radius is reduced, and the radius of the middle section of the curved pipe transmission pipeline (distal end radius-proximal end radius=middle section radius) is reduced from 4114mm to within 2000mm.

[0024] 2. The present invention enlarges or reduces the turning radius by adjusting the reserved lengths at both ends of the running rabbit and the processing radius of the middle section, thereby meeting the reserved turning radius requirements and greatly saving construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the posture of the inner arc running rabbit in the running rabbit tube curve;

[0026] Figure 2 Schematic diagram of running rabbit's overall dimensions and pipeline dimensions;

[0027] Figure 3 Schematic diagram of the minimum distance between the cylinders at both ends of the running rabbit and the inner wall of the pipe;

[0028] Figure 4 When the running rabbit arc is designed to be 1970mm, the minimum distance between the running rabbit arc and the inner wall of the pipe;

[0029] Figure 5 The minimum distance between the running rabbit arc and the inner wall of the pipe when the running rabbit arc is designed to be 2000mm;

[0030] Figure 6 When the running rabbit arc is designed to be 1954mm, the minimum distance between the running rabbit arc and the inner wall of the pipe;

[0031] In the figure, 12: curved tube transmission track; 13: running rabbit. DETAILED DESCRIPTION

[0032] Design principle of the present invention

[0033] 1. Innovation of the present invention: The innovation lies in that outstanding effects are achieved by changing the shape of the elements: the shape of the running rabbit is changed from a cylindrical shape to a fully symmetrical concave shape. While meeting various index requirements, the design of the target chamber and the hot chamber is relatively as small as possible, which reduces the construction cost, and reduces the radius of the middle section of the curved pipe transmission pipeline (distal radius-proximal radius=middle section radius) from 4114mm to within 2000mm.

[0034] 2. Difficulties in the design of the present invention: There are two limiting conditions in the transmission process of the rabbit: First, the posture of the rabbit during the transmission process is not fixed, but it moves forward while rotating; second, gas is used to push the rabbit from one end of the curved tube runway to the other. Difficulty 1: The instability of the posture of the rabbit during the transmission process. Assuming that a shape similar to the curved tube runway is used instead of a cylinder, the rabbit will still be stuck during the transmission process, because when the curved tube-shaped rabbit rotates to a certain angle, its bending direction is opposite to the direction of the curved tube runway and it will be stuck; when the rabbit is cylindrical, because the side of the cylinder is straight, one of the straight sides will collide with the curved tube runway and become stuck, unless the diameter of the curved tube runway is designed to be large enough to avoid collision. The second difficulty is that the rabbit is driven by gas for transmission. In order to avoid the jamming between the cylindrical rabbit or the curved tube rabbit and the curved tube track, the diameter of the curved tube track must be increased. However, as the diameter increases, the gap between the rabbit and the curved tube track will also increase, and the gas will flow from the tail of the rabbit to the side, thereby reducing the thrust of the gas on the rabbit.

[0035] 3. Key points of running rabbit design

[0036] First, solve the jamming problem by changing the shape of the rabbit. After changing the shape of the rabbit to a symmetrical concave shape, no matter how the rabbit rotates in the curved track, it will not get stuck. The reason why it will not get stuck is not because the track is widened, but because the contact point between the rabbit and the curved track is changed from one surface to two points, and the two contact points between the rabbit and the curved track are the front and rear two points on one side instead of the front and rear four points on both sides. Because the rabbit is affected by centrifugal force during the transmission process, it always deviates in the opposite direction of the curved track, such as Figure 1 As shown, even if the rabbit touches the proximal radius of the curved track during its rotation, there are still two contact points with the proximal curved track, and there will be no contact points on the distal radius because there is a gap of 1.5mm to 1.53mm between the arc area of ​​the rabbit and the curved track.

[0037] Second, retain most of the gas to propel the rabbit, and only allow a small amount of gas to flow out from the side, finding a balance between transmission efficiency and fault tolerance. The fault tolerance refers to preventing burrs on the side walls of the rabbit or the curved tube runway from scratching the rabbit or the curved tube runway. Therefore, the gap between the rabbit and the curved tube runway is designed to be 1.5mm to 1.53mm. This gap is indispensable. The 2mm gap refers to the starting end of the rabbit arc from the end of the cylinder (the cylinder is not taken into account at this time). In this way, the gap between the starting point of the arc and the curved tube runway is 2mm. However, after discarding the 11mm cylinders at both ends, the gap is only 1.53mm. Therefore, the maximum gap of 1.53mm refers to the gap between the rabbit arc segment or the starting point of the rabbit arc and the curved tube runway when the cylinders at both ends are not taken into account.

[0038] The present invention will be further explained below in conjunction with the accompanying drawings:

[0039] A rabbit-running device for transporting target pieces Figure 1-6 As shown, the rabbit running device is arranged in a curved tubular transmission runway, and the rabbit running device is transported from one end of the curved tubular transmission runway to the other end by gas; its characteristics are: the two ends of the cross section on the axial centerline of the rabbit running device are each a cylinder with a set height, and the middle of the two cylinders are two relatively long arcs that are concave inwards, and the two inward concave arcs are symmetrically arranged along the axial centerline of the rabbit running device; the curvature range of the two inward concave arcs is based on the gap between the rabbit running device and the curved tubular transmission runway being not less than the limit gap value, and the limit gap value refers to the gap between the middle arc area of ​​the rabbit running device excluding the cylindrical setting areas at both ends and the curved tubular transmission runway. The curved tubular transmission runway is referred to as the rabbit running tube.

[0040] Furthermore, the diameter calculation method of the rabbit running device is: diameter = distal radius of the curved tube transmission runway - proximal radius of the curved tube transmission runway - initial gap value; the length calculation method of the rabbit running device is: when the diameter of the rabbit running device is fixed, a certain space can be reserved at both ends of the rabbit running device to install other accessories, and the curvature range of the middle area can ensure that the gap between the rabbit running device and the transmission tube is not less than the limit gap value. The length is designed based on the size of the target piece so that it can be completely placed in the rabbit running device. The initial gap value refers to the gap between the rabbit running device including the cylindrical areas at both ends of the rabbit running device and the curved tube transmission runway.

[0041] Furthermore, the limit gap value is 1.5 mm.

[0042] Furthermore, the initial gap value is 2 mm.

[0043] Furthermore, when the distal radius of the curved pipe transmission track is R2048 mm, the proximal radius is R1952 mm, and the initial gap value is 2 mm, the diameter of the rabbit running device = R2048 mm - R1952 mm - 2 mm = 94 mm.

[0044] Furthermore, when the diameter of the rabbit running device = 94mm, the length of the rabbit running device is 234mm; the heights of the cylinders at both ends are 11mm respectively, and the length of the arc concave in the middle = 234mm-2*11mm=212mm.

[0045] Furthermore, when the distal radius of the curved tubular transmission track is R2048mm and the proximal radius is R1952mm, the curvature range of the two inwardly concave arcs of the rabbit running device is R1954mm-R1970mm. Within this range, the gap between the rabbit running device and the curved tubular transmission track is not less than the limit gap value of 1.5mm.

[0046] Further, when the distal radius of the curved tubular transmission track is R2048 mm, the proximal radius is R1952 mm, and the curvature of the two inwardly concave arcs of the rabbit running device is R1954 mm, the gap between the rabbit running device and the curved tubular transmission track is 1.53 mm.

[0047] Further, when the distal radius of the curved tubular transmission track is R2048 mm, the proximal radius is R1952 mm, and the curvature of the two inwardly concave arcs of the rabbit running device is R1970 mm, the gap between the rabbit running device and the curved tubular transmission track is 1.51 mm.

[0048] A method for designing a running rabbit device for transporting a target, wherein the method comprises the following steps:

[0049] Step 1: Set the limit gap value and the initial gap value;

[0050] Step 1, determining the far end radius and the near end radius of the curved tube transmission runway;

[0051] Step 2: determining the diameter of the rabbit running device according to the distal radius and the proximal radius;

[0052] Step 3: Determine the height of the cylinders at both ends and the length of the rabbit running device according to the diameter of the rabbit running device;

[0053] Step 4: Determine the curvature range of the running rabbit device according to the length of the running rabbit device, the height of the cylinders at both ends of the running rabbit device, and the limit gap value.

[0054] Embodiment 1: Design of initial gap and concave arc

[0055] The rabbit running design method proposed in the present invention is to design the rabbit running shape so that the turning radius of the rabbit running can meet the reserved turning radius requirements of the rabbit running pipe, so that the rabbit running can smoothly pass through the rabbit running pipe bend and complete the transportation task. Figure 1 In the figure, the rabbit tube is a round tube 12, and the rabbit is 13. In order to reduce the air pressure flow used to transport the rabbit 13, the gap between the rabbit 13 and the inner wall of the rabbit tube 12 needs to be small enough to avoid serious gas leakage. Therefore, the two ends of the rabbit 13 are cylindrical, and the gap between the inner diameter of the rabbit tube 12 is 2mm, that is, 1mm on one side.

[0056] If the shape of the rabbit is directly a cylindrical shape, the rabbit will get stuck in the curved transmission track (hereinafter referred to as the curved track). The reason for the stuckness is that the side of the cylinder collides with the arc corresponding to the radius of the proximal end of the curved track. If the shape of the rabbit is changed to the same shape as the curved track, that is, a shape with one side convex and the other concave, the rabbit will move forward while rotating in the curved track. When the rabbit rotates to a certain angle, its bending direction is opposite to that of the curved track, and it will get stuck. Processing the middle section of the cylinder into an inner arc can effectively prevent the rabbit from getting stuck in the rabbit tube.

[0057] like Figure 1 The figure shows the posture of the inner arc rabbit in the curved pipe. By machining the inner arc in the middle section of the rabbit so that the middle section of the rabbit does not contact the inner diameter of the curved pipe, the rabbit can be prevented from getting stuck. That is, by avoiding the three-point contact between the rabbit and the inner diameter of the rabbit pipe, the rabbit can be prevented from getting stuck. The actual turning radius required by the rabbit can be controlled by changing the concave radius of the inner arc in the middle section.

[0058] This embodiment reduces the turning radius of the rabbit from 4114mm to less than 2000mm. When the rabbit is a cylinder with a diameter of 94mm and a length of 243mm, the inner diameter of the rabbit tube is 96mm. At this time, the turning radius of the middle section of the curved tubular transmission runway (distal radius-proximal radius=middle section radius) cannot be less than 4114mm, so a larger space is required to install the rabbit tube, which increases the construction cost. When the method provided in the present invention is adopted, an arc is machined on the outer surface of the rabbit, which can greatly reduce the turning radius required for the curved tubular transmission runway. For example, a cylindrical part with a length of 11mm is left at each end of the rabbit to ensure air tightness, and then an arc with a radius of 1954mm-1970mm is machined in the middle section of the rabbit, so that the radius of the middle section of the curved tubular transmission runway can be reduced from 4114mm to less than 2000mm, and the reserved length at both ends of the rabbit and the processing radius of the middle section can be adjusted to enlarge or reduce the turning radius, thereby meeting the reserved turning radius requirements and greatly saving construction costs.

[0059] Embodiment 2: Design of concave arc range

[0060] like Figure 2 As shown, the diameter of the rabbit is 94mm, the length is 234mm, and the inner diameter of the transmission pipeline is 2048-1952=96mm, that is, the gap between the rabbit and the transmission pipeline is 96-94=2mm. In this way, the rabbit has better air tightness during transportation, which can reduce the working gas flow, air pressure intensity, and reduce the cost of gas supply equipment. Figure 1 shown.

[0061] In terms of the rabbit design, if the rabbit is not designed with an arc and only uses a cylinder with a diameter of 94mm to move in the transmission pipe, it will get stuck in the curve due to the reserved gap of 2mm being too small, and the transportation cannot be completed. Therefore, the cylinder is designed to be an arc to avoid the rabbit getting stuck, and the two ends of the arc are designed with a length of 11mm. The reason for keeping the diameter unchanged at 94mm is that there are other accessories inside the two ends of the rabbit, which require space for installation. Therefore, an 11mm cylinder is left. The reason for 11mm is to accommodate other accessories and to ensure that there is a gap of no less than 1.5mm between the rabbit and the transmission pipe. In order to improve the fault tolerance rate, the gap between the arc of the rabbit and the inner wall of the pipe ranges from 1.5mm to 1.53mm.

[0062] Below Figure 4-6 For example, it is proved that the gap between the arc of the running rabbit and the inner wall of the pipe should range from 1.5mm to 1.53mm.

[0063] like Figure 5When the arc radius is 2000mm, the minimum gap between the arc and the inner wall of the pipe is 1.47mm, which is less than the threshold range of 1.5mm. Therefore, it is not advisable to set the arc radius to 2000mm.

[0064] like Figure 4 When an arc is drawn through the two end points with a radius of 1970 mm, the minimum gap between the arc and the inner wall of the pipe is 1.51 mm.

[0065] like Figure 6 As shown in the figure, when the running rabbit arc takes the value of 1954mm, the minimum gap between the running rabbit arc and the inner wall of the pipe is 1.53mm.

[0066] It can be seen from this that the minimum gap between the rabbit arc and the inner wall of the curved transmission track is inversely proportional to the value of the rabbit arc radius. That is, the smaller the value of the rabbit arc radius, the more obvious the rabbit concave is, and the larger the gap between the rabbit and the inner wall of the pipe.

[0067] If the running rabbit arc value is less than 1954mm, although the gap between the running rabbit arc and the inner wall of the pipe will be larger (greater than 1.53mm), the gap between the running rabbit and the inner wall of the pipe has been limited to 1.53mm due to the cylindrical parts with a length of 11mm at both ends (the "cause the cylindrical parts with a length of 11mm at both ends have limited the gap between the running rabbit and the inner wall of the pipe to 1.53mm" is because the end points of the 11mm length at both ends are the starting point and the end point of the arc segment, which is equivalent to drawing a circle through these two points. When the radius of the circle is 1954, the minimum distance between the running rabbit arc and the inner wall of the pipe is 1.53mm. When the radius of the circle is 1970, the minimum distance between the running rabbit arc and the inner wall of the pipe is 1.53mm. The minimum distance is 1.51mm, and no matter how the radius of the circle is, the distance between the starting point and the end point is fixed, that is, 234-2x11=212mm, so the distance from the starting point and the end point to the inner wall of the pipe is also fixed, that is, 1.53mm). Therefore, it will be meaningless to have a larger gap between the running rabbit arc and the inner wall of the pipe. Therefore, for the curved tube-shaped transmission runway with a middle radius of 2000mm (middle radius = distal radius 2048mm-proximal radius 1952mm), a running rabbit diameter of 94mm, an inner diameter of the transmission pipe of 96mm, a running rabbit length of 234mm, and a cylindrical length of 11mm at both ends of the running rabbit, the running rabbit arc design size range can be 1954~1970mm.

[0068] In other cases, such as when the cylindrical lengths at both ends are less than 11mm, the end value of the corresponding rabbit arc value range can be reduced, or the designed boundary condition that the gap between the arc and the inner wall of the pipe is not less than 1.5mm is changed to not less than 1mm, then the maximum end value of the corresponding rabbit arc value range can be increased.

[0069] It should be emphasized that the above specific embodiments are merely explanations of the present invention, and they are not limitations of the present invention. After reading this specification, those skilled in the art can make modifications to the above embodiments without any creative contribution as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A rabbit-running device for transporting targets, which is arranged in a curved tube-shaped transmission runway, and the rabbit-running device is transported from one end of the curved tube-shaped transmission runway to the other end by gas; characterized in that: The two ends of the cross-section on the axial center line of the rabbit running device are respectively a cylinder with a set height, and in the middle of the two cylinders are two inwardly concave arcs, and the two inwardly concave arcs are symmetrically arranged along the axial center line of the rabbit running device; the curvature range of the two inwardly concave arcs is based on the standard that the gap between the rabbit running device and the curved tubular transmission runway is not less than the limit gap value, and the limit gap value refers to the gap between the middle arc area of ​​the rabbit running device excluding the cylindrical setting areas at both ends and the curved tubular transmission runway.

2. A rabbit-running device for transporting a target according to claim 1, characterized in that: The diameter calculation method of the rabbit running device is as follows: diameter = distal radius of the curved tube transmission runway - proximal radius of the curved tube transmission runway - initial gap value; the length calculation method of the rabbit running device is as follows: when the diameter of the rabbit running device is fixed, a certain space can be reserved at both ends of the rabbit running device to install other accessories, and the curvature range of the middle area can ensure that the gap between the rabbit running device and the transmission tube is not less than the limit gap value. The length is designed based on the size of the target piece so that it can be completely placed in the rabbit running device. The initial gap value refers to the gap between the rabbit running device including the cylindrical areas at both ends and the curved tube transmission runway.

3. A rabbit-running device for transporting a target according to claim 2, characterized in that: The limit gap value is 1.5 mm.

4. A rabbit-running device for transporting a target according to claim 2, characterized in that: The initial gap value is 2 mm.

5. A rabbit-running device for transporting a target according to claim 4, characterized in that: When the distal radius of the curved pipe transmission track is R2048 mm, the proximal radius is R1952 mm, and the initial gap value is 2 mm, the diameter of the rabbit running device = R2048 mm - R1952 mm - 2 mm = 94 mm.

6. A rabbit-running device for transporting a target according to claim 5, characterized in that: When the diameter of the rabbit running device = 94mm, the length of the rabbit running device is 234mm; the heights of the cylinders at both ends are 11mm respectively, and the length of the arc concave in the middle = 234mm-2*11mm=212mm.

7. A rabbit-running device for transporting a target according to claim 6, characterized in that: When the distal radius of the curved tubular transmission runway is R2048mm and the proximal radius is R1952mm, the curvature range of the two inwardly concave arcs of the rabbit running device is R1954mm-R1970mm. Within this range, the gap between the rabbit running device and the curved tubular transmission runway is not less than the limit gap value of 1.5mm.

8. A rabbit-running device for transporting a target according to claim 7, characterized in that: When the distal radius of the curved tubular transmission track is R2048 mm, the proximal radius is R1952 mm, and the curvature of the two inwardly concave arcs of the rabbit running device is R1954 mm, the gap between the rabbit running device and the curved tubular transmission track is 1.53 mm.

9. A rabbit-running device for transporting a target according to claim 7, characterized in that: When the distal radius of the curved tubular transmission track is R2048 mm, the proximal radius is R1952 mm, and the curvature of the two inwardly concave arcs of the rabbit running device is R1970 mm, the gap between the rabbit running device and the curved tubular transmission track is 1.51 mm.

10. A method for designing a target transporting rabbit device based on any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1: Set the limit gap value and the initial gap value; Step 1, determining the far end radius and the near end radius of the curved tube transmission runway; Step 2: determining the diameter of the rabbit running device according to the distal radius and the proximal radius; Step 3: Determine the height of the cylinders at both ends and the length of the rabbit running device according to the diameter of the rabbit running device; Step 4: Determine the curvature range of the running rabbit device according to the length of the running rabbit device, the height of the cylinders at both ends of the running rabbit device, and the limit gap value.

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