Full-angle detection tool for industrial X-ray machine

By designing an industrial X-ray machine inspection fixture with a sphere and a full-angle motion mechanism, the problem of non-destructive testing of items with different geometric shapes was solved, achieving full-angle imaging and flexible inspection, and reducing reliance on proprietary equipment.

CN120971463BActive Publication Date: 2026-07-07BEIJING INST OF COMP TECH & APPL

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING INST OF COMP TECH & APPL
Filing Date
2025-09-12
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing industrial X-ray inspection equipment is insufficient to meet the non-destructive testing requirements of items with different geometric shapes at custom angles, especially in scientific research or in diverse application scenarios where there is a mismatch between proprietary equipment and tooling.

Method used

Design a testing fixture that includes a carrying sphere, an all-angle motion mechanism, a base, and a base rotation device. By fixing the carrying sphere with an airbag and controlling the all-angle motion mechanism, the fixture can achieve all-angle testing of the object being tested.

Benefits of technology

It enables full-angle imaging inspection of objects with various geometric shapes, reduces dependence on proprietary tooling, improves inspection flexibility, and reduces costs.

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Abstract

The present application relates to a kind of industrial X-ray machine full-angle detection tool, belong to industrial detection field.The detection tool of the present application includes: carrier sphere (1), full-angle movement mechanism (2), base (3) and base rotating device (4), 3 full-angle movement mechanisms (2) are installed on base (3), base (3) is connected with base rotating device (4) by gear, carrier sphere (1) is placed on full-angle movement mechanism (2).The detection tool of the present application can meet the demand of full-angle imaging of measured object, and various geometric shapes of measured object can be detected using the tool of the present application, improve the flexibility of X-ray imaging nondestructive testing, reduce the dependence on special tool, thereby reduce cost.
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Description

Technical Field

[0001] This invention belongs to the field of industrial inspection, specifically relating to a full-angle inspection fixture for an industrial X-ray machine. Background Technology

[0002] X-ray imaging is increasingly used in industrial non-destructive testing (NDT) in fields such as electric vehicle batteries, key components of mechanical equipment, electronic devices, and chips, constantly placing higher demands on the automation and adaptability of testing equipment. Current industrial NDT mainly relies on proprietary equipment or general-purpose equipment integrated with proprietary tooling, lacking versatility for test objects of different sizes and shapes. When new geometric shapes of test objects are introduced that are incompatible with proprietary equipment or tooling, especially in research fields or applications with diverse test objects, proprietary X-ray inspection equipment struggles to meet the NDT requirements of different geometric shapes at custom angles. Therefore, a universal, all-angle X-ray NDT device or apparatus has become an urgent problem to be solved. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] The technical problem to be solved by the present invention is how to provide an industrial X-ray machine full-angle inspection fixture to solve the problem that proprietary X-ray inspection equipment is unable to meet the non-destructive inspection requirements of items with different geometric shapes at custom angles when a new geometric shape of the object to be tested is incompatible with the proprietary equipment or its fixture.

[0005] (II) Technical Solution

[0006] In order to solve the above-mentioned technical problems, the present invention proposes an industrial X-ray machine full-angle inspection fixture, which includes: a carrying sphere (1), a full-angle motion mechanism (2), a base (3) and a base rotation device (4);

[0007] Three full-angle motion mechanisms (2) are installed on the base (3). The base (3) and the base rotation device (4) are connected by gears. A sphere (1) is placed on the full-angle motion mechanism (2).

[0008] The object carrier sphere (1) consists of two symmetrical hemispheres. Each hemisphere includes: a latch (8), an object carrier shell (5), an air bladder (6), and an inflation / deflation port (7). The object carrier shell (5) has four latches (8) at its opening, which connect the two hemispheres together. The object carrier shell (5) is inlaid with an air bladder (6). The inflation / deflation port (7) is used to inflate and deflate the air bladder (6). By inflating and deflating the air bladder (6), the shape of the air bladder is changed, thereby fixing the object to be tested.

[0009] The full-angle motion mechanism (2) is used to control the change of the pitch angle in the first direction and the left and right tilt angle in the second direction of the ball (1);

[0010] The base rotation device (4) is used to control the rotation of the load sphere (1) in three directions via the base (3).

[0011] (III) Beneficial Effects

[0012] This invention proposes an all-angle inspection fixture for an industrial X-ray machine. The purpose of this invention is to provide an all-angle motion mechanism composed of three sets of omnidirectional wheels of different sizes, which can effectively support a spherical stage (carrying sphere). By designing the carrying sphere (1), this invention can not only wrap and fix the test object with the buckle (8) and the air bag (6), so that test objects of various geometric shapes can be inspected, but also the shell (5) of the carrying sphere does not affect the inspection of the test object. This invention controls the pitch angle (first direction) and left and right tilt angle (second direction) of the carrying sphere (1) through the all-angle motion mechanism (2), and controls the clockwise and counterclockwise rotation of the carrying sphere (1) by the base rotation device (4), so that the test object can be easily rotated to various angles for inspection.

[0013] This invention provides an industrial X-ray machine omnidirectional inspection fixture that can meet the needs of omnidirectional imaging of the tested items. Moreover, the fixture can be used to inspect items of various geometric shapes, improving the flexibility of X-ray imaging non-destructive testing, reducing dependence on proprietary fixtures, and thus reducing costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an industrial X-ray machine full-angle inspection fixture provided in an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of a hemisphere of a sphere used to carry objects, provided in an embodiment of the present invention.

[0016] Figure 3 A schematic diagram of the all-angle motion mechanism provided in an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram showing the distribution of the all-angle motion mechanism in the base according to an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the locking and clamping principle provided in an embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram of the contact between the all-angle motion mechanism and the carrying sphere provided in an embodiment of the present invention;

[0020] Figure 7 A schematic diagram of the base rotation device provided in an embodiment of the present invention;

[0021] Figure 8A schematic diagram of the full-angle motion mechanism (2) provided in the embodiment of the present invention controlling the rotation of the carrying ball (1) in the first and second directions. Detailed Implementation

[0022] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0023] To overcome the shortcomings of existing non-destructive testing fixtures, the present invention aims to provide an industrial X-ray machine full-angle inspection fixture. By designing a three-axis driven full-angle spherical inspection fixture, the test object can be inspected from all angles, thereby achieving the goal of automated inspection of objects of different shapes.

[0024] This invention discloses an industrial X-ray machine omnidirectional inspection fixture, comprising four parts: a sphere, an omnidirectional motion mechanism, a base, and a base rotation device. The sphere consists of two symmetrical hemispheres, each hemisphere comprising a latch, a sphere shell, an air bladder, and an inflation / deflation port. The inflation / deflation of the air bladder allows for the fixing of the object to be measured and the changing of the latch's locking and loosening states. Three omnidirectional motion mechanisms are mounted in a triangular configuration on the base. The base and the base rotation device transmit power through gear meshing, driving the base, the omnidirectional motion mechanisms mounted on its upper side, and the sphere to rotate synchronously, rotating clockwise and counterclockwise (third direction). The sphere is placed on the omnidirectional motion mechanism, controlling the pitch angle (first direction) and the left and right tilt angle (second direction) of the sphere (1).

[0025] This invention provides an industrial X-ray machine omnidirectional inspection fixture, comprising four parts: a sphere carrying a sample, an omnidirectional motion mechanism, a base, and a base rotation device. Figure 1 As shown. The connection is as follows: three omnidirectional motion mechanisms are installed on the base, and the installation method is screw fixing; a ring of external teeth is distributed on the outer edge of the base, and the base and the base rotation device transmit power through gear meshing; a sphere is placed on the omnidirectional motion mechanism.

[0026] The sphere carrying the object consists of two symmetrical hemispheres, as shown in the schematic diagram of the hemispheres. Figure 2 As shown. Each hemisphere comprises four parts: a locking mechanism, a carrying sphere shell, an air bladder, and inflation / deflation ports. The carrying sphere shell has four locking mechanisms at its opening, which connect the two hemispheres together. An air bladder is embedded inside the carrying sphere shell. Inflating and deflating the air bladder changes its shape, thus securing the object being tested. When the air bladder is inflated, it expands, increasing the pressure between the locking mechanisms and locking them in a locked state. When the air bladder deflates, the pressure between the locking mechanisms is released, and the locking mechanisms relax.

[0027] The omnidirectional motion mechanism consists of a drive shaft, a geared motor, bearing housings, and spherical omnidirectional wheels, such as... Figure 3As shown. A drive shaft is mounted on the bearing housing, and a spherical omnidirectional wheel is mounted on the drive shaft. One side of the drive shaft is connected to a reduction motor, and the rotation of the reduction motor drives the spherical omnidirectional wheel to rotate. The spherical omnidirectional wheel consists of three sets of wheels, with the diameter of the two outer sets of wheels slightly larger than that of the middle set. The edges of the three sets of wheels simultaneously maintain contact with the spherical shell, as shown in the contact state. Figure 6 As shown. The omnidirectional motion mechanism is arranged in a triangular pattern on the base, as follows. Figure 4 As shown.

[0028] The base rotation device is characterized in that it comprises two parts: a drive gear and a base drive motor, as shown below. Figure 7 As shown, a drive gear is fixedly connected to the output shaft of the base drive motor, and the drive gear meshes with the external gear ring on the base. When the base drive motor rotates, it drives the drive gear to rotate, thereby driving the base and the omnidirectional motion mechanism and the carrying ball mounted on its upper side to rotate synchronously; the fixed-angle rotation of the base is achieved by the precise forward and reverse rotation of the base drive motor.

[0029] The principle of the omnidirectional motion of an industrial X-ray machine omnidirectional inspection fixture is as follows: the sphere carrying the sample rotates in three directions (the three directions are mutually orthogonal) through the combined action of the omnidirectional motion mechanism and the base rotation device, thereby achieving full-field-of-view rotation of the sphere. Furthermore, the rotation control in the three directions is as follows: the omnidirectional motion mechanism controls the pitch angle (first direction) and tilt angle (second direction) of the sphere, while the base rotation device controls the clockwise and counterclockwise rotation of the sphere (third direction). A schematic diagram of the omnidirectional motion mechanism controlling the rotation of the sphere in the first and second directions is shown below. Figure 8 As shown, v1, v2, and v3 represent the velocities of the three sets of full-angle motion mechanisms in the rotational output direction, i.e., the angles of rotation per unit time; the included angles of v1, v2, and v3 are all 120 degrees; v1 and v2 have components in both the first and second directions, while -v3 has the same component in the second direction; if the required rotation angle in the first and second directions is (θ)... x1 ,θ y1 When v1, v2, and v3 are in the first and second directions, the components of v1, v2, and v3 need to satisfy the following formula:

[0030]

[0031] The purpose of this invention is to provide an industrial X-ray machine full-angle inspection fixture. This fixture is a non-dedicated device in the field of non-destructive testing and is suitable for industrial test items of different shapes and sizes. It can realize full-angle X-ray imaging of the test items. The test items are placed inside a carrier sphere, and the outer shell of the carrier sphere is made of carbon fiber material with low light absorption (X-ray).

[0032] Example 1:

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0034] The present invention provides an industrial X-ray machine omnidirectional inspection fixture, comprising four parts: a sphere (1), an omnidirectional motion mechanism (2), a base (3), and a base rotation device (4), as follows: Figure 1 As shown. The connection relationship is as follows: three full-angle motion mechanisms (2) are installed on the base (3), the base (3) and the base rotation device (4) are connected by gears, and the load ball (1) is placed on the full-angle motion mechanism (2).

[0035] The aforementioned sphere (1), as Figure 2 As shown, it consists of two symmetrical hemispheres. A schematic diagram of the hemispheres carrying the object is shown below. Figure 2 As shown. Each hemisphere comprises four parts: a latch (8), a container shell (5), an air bladder (6), and an inflation / deflation port (7). The container shell (5) has four latches (8) at its opening, which connect the two hemispheres together. The container shell (5) is fitted with an air bladder (6), and the inflation / deflation port (7) is used to inflate and deflate the air bladder (6). By inflating and deflating the air bladder (6), the shape of the air bladder is changed, thereby fixing the object being tested.

[0036] The full-angle motion mechanism (2) is used to control the pitch angle and left and right tilt angle of the carrying ball (1);

[0037] The base rotation device (4) is used to control the clockwise and counterclockwise rotation of the cargo ball (1) via the base (3).

[0038] Assembly process during use: The latches (8) of the upper and lower hemispheres are not aligned (in a misaligned state). Then, align the openings of the upper and lower hemispheres and rotate the upper and lower hemispheres to make the latches (8) overlap (i.e., in a coupled state). At this time, inflate the air bladder inside the cargo sphere to make the latches (8) retract. Similarly, the disassembly and assembly process is the reverse of the assembly process. Figure 5 As shown, after the airbag (6) is inflated, it will exert pressure F1 and F2 from the inside to the outside of the cargo ball shell (5). The pressure F1 and F2 will be transmitted to the latch (8) through the shell, generating positive pressure F3 and F4 between a pair of mating latches (8), thereby increasing the friction between the latches (8) and making the pair of latches locked. When the airbag (6) is deflated, the pressure F3 and F4 between the latches will drop to zero, and the latches will be relaxed.

[0039] The aforementioned all-angle motion mechanism (2), such as Figure 3As shown, it includes: a drive shaft (9), a geared motor (10), a bearing housing (11), and a spherical omnidirectional wheel (12). Further, the bearing housing (11) supports the drive shaft (9), and the spherical omnidirectional wheel (12) is mounted on the drive shaft (9). One side of the drive shaft (9) is connected to the geared motor (10), and the spherical omnidirectional wheel (12) is driven to rotate by the rotation of the geared motor (10). The spherical omnidirectional wheel (12) consists of three sets of wheels, with the two side sets having a slightly larger diameter than the middle wheel. The edges of all three sets of wheels maintain contact with the spherical housing (5) simultaneously, and the contact state is as follows: Figure 6 As shown. The distribution of the omnidirectional motion mechanism (2) on the base (3) is as follows. Figure 4 As shown, they are distributed in a triangular pattern.

[0040] The base rotation device (4) comprises two parts: a drive gear (13) and a base drive motor (14), as shown below. Figure 7 As shown. Further, a drive gear (13) is fixedly connected to the output shaft of the base drive motor (14), and the drive gear (13) meshes with the external gear ring on the base (3). When the base drive motor (14) rotates, it drives the drive gear (13) to rotate, thereby driving the base (3) to rotate; the fixed angle rotation of the base (3) is achieved by the precise forward and reverse rotation of the base drive motor (14).

[0041] The principle of the all-angle motion of the industrial X-ray machine all-angle inspection fixture is as follows: the sphere (1) rotates in three directions (the three directions are mutually orthogonal) through the combined action of the all-angle motion mechanism (2) and the base rotation device (4), thereby realizing the rotation of the sphere (1) across the entire field of view. Furthermore, the rotation control in the three directions is as follows: the all-angle motion mechanism (2) controls the change of the pitch angle (first direction) and the left and right tilt angle (second direction) of the sphere (1), and the base rotation device (4) controls the clockwise and counterclockwise rotation of the sphere (1) (third direction). Further, the schematic diagram of the rotation of the sphere (1) in the first and second directions controlled by the all-angle motion mechanism (2) is shown below. Figure 8 As shown, v1, v2, and v3 represent the velocities of the three sets of full-angle motion mechanisms (2) in the rotational output direction, respectively. The angles between v1, v2, and v3 are all 120 degrees. v1 and v2 have components in the first and second directions, and -v3 is the same as in the second direction. If the rotation angle in the first and second directions is required to be (θ) x1 ,θ y1 When this is the case, the components of v1, v2, and v3 in the first and second directions need to satisfy the following: That's all.

[0042] Example 2:

[0043] An industrial X-ray machine omnidirectional inspection fixture includes four parts: a sphere, an omnidirectional motion mechanism, a base, and a base rotation device. The connection relationship is as follows: three omnidirectional motion mechanisms are installed on the base and fixed with screws; a ring of external teeth is distributed on the outer edge of the base, and the base and the base rotation device transmit power through gear meshing; the sphere is placed on the omnidirectional motion mechanism.

[0044] Furthermore, the aforementioned sphere is composed of two symmetrical hemispheres. Each hemisphere consists of a locking mechanism, a sphere shell, an air bladder, and inflation / deflation ports. The sphere shell has four locking mechanisms at its opening for connecting the two hemispheres. An air bladder is embedded inside the sphere shell. Inflating and deflating the air bladder changes its shape, thus securing the object being tested. When the air bladder is inflated, the locking mechanism is locked, and the object is clamped. When the air bladder is deflated, the locking mechanism is relaxed, and the object is also relaxed.

[0045] Furthermore, the omnidirectional motion mechanism comprises a drive shaft, a geared motor, a bearing housing, and spherical omnidirectional wheels. The omnidirectional motion mechanism is arranged in a triangular configuration on the base (3). The bearing housing supports the drive shaft, which is equipped with spherical omnidirectional wheels. One side of the drive shaft is connected to the motor, which drives the spherical omnidirectional wheels to rotate. The spherical omnidirectional wheels consist of three sets of wheels, with the diameter of the two side sets slightly larger than that of the middle set. The edges of all three sets of wheels maintain contact with the spherical shell simultaneously.

[0046] Furthermore, the base rotation device comprises two parts: a drive gear and a base drive motor. The drive gear is fixedly connected to the output shaft of the base drive motor, and the drive gear meshes with the external gear ring on the base. When the base drive motor rotates, it drives the drive gear (13) to rotate, thereby driving the base and the omnidirectional motion mechanism and the load ball mounted on its upper side to rotate synchronously; the fixed angle rotation of the base is achieved by the precise forward and reverse rotation of the base drive motor.

[0047] The principle of omnidirectional motion of an industrial X-ray machine omnidirectional inspection fixture is as follows: the sphere (1) rotates in three directions (the three directions are mutually orthogonal) through the combined action of the omnidirectional motion mechanism and the base rotation device, thereby realizing the rotation of the sphere across the entire field of view. Further, the rotation control in the three directions is as follows: the omnidirectional motion mechanism controls the change of the sphere's pitch angle (first direction) and left / right tilt angle (second direction), and the base rotation device controls the sphere's clockwise and counterclockwise rotation (third direction). Further, a schematic diagram of the omnidirectional motion mechanism controlling the sphere's rotation in the first and second directions is shown below. Figure 8As shown, v1, v2, and v3 represent the velocities of the three sets of full-angle motion mechanisms (2) in the rotational output direction, respectively. The angles between v1, v2, and v3 are all 120 degrees. v1 and v2 have components in both the first and second directions, while v3 has the same component in the first direction. If the required rotation angle in the first and second directions is (θ) x1 ,θ y1 When this is the case, the components of v1, v2, and v3 in the first and second directions need to satisfy the following:

[0048] The purpose of this invention is to provide an all-angle motion mechanism consisting of three sets of omnidirectional wheels of different sizes, which can effectively support a spherical stage (object carrier). By designing the object carrier (1), this invention can not only wrap and fix the object to be tested with the buckle (8) and the air bag (6), so that objects of various geometric shapes can be tested, but also the shell (5) of the object carrier does not affect the testing of the object. This invention controls the pitch angle (first direction) and left and right tilt angle (second direction) of the object carrier (1) through the all-angle motion mechanism (2), and controls the clockwise and counterclockwise rotation of the object carrier (1) by the base rotation device (4), so that the object to be tested can be easily rotated to various angles for testing.

[0049] This invention provides an industrial X-ray machine omnidirectional inspection fixture that can meet the needs of omnidirectional imaging of the tested items. Moreover, the fixture can be used to inspect items of various geometric shapes, improving the flexibility of X-ray imaging non-destructive testing, reducing dependence on proprietary fixtures, and thus reducing costs.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A full-angle inspection fixture for an industrial X-ray machine, characterized in that, The testing fixture includes: a sphere (1), a full-angle motion mechanism (2), a base (3), and a base rotation device (4); Three full-angle motion mechanisms (2) are installed on the base (3). The base (3) and the base rotation device (4) are connected by gears. A sphere (1) is placed on the full-angle motion mechanism (2). The object carrier sphere (1) consists of two symmetrical hemispheres. Each hemisphere includes: a latch (8), an object carrier shell (5), an air bladder (6), and an inflation / deflation port (7). The object carrier shell (5) has four latches (8) at its opening, which connect the two hemispheres together. The object carrier shell (5) is inlaid with an air bladder (6). The inflation / deflation port (7) is used to inflate and deflate the air bladder (6). By inflating and deflating the air bladder (6), the shape of the air bladder is changed, thereby fixing the object to be tested. The full-angle motion mechanism (2) is used to control the change of the first direction pitch angle and the second direction left and right tilt angle of the carrying ball (1); The base rotation device (4) is used to control the rotation of the sphere (1) in the third direction (clockwise and counterclockwise) via the base (3); in, When the airbag (6) is inflated, it will exert pressure F1 and F2 on the shell (5) from the inside out. The pressure F1 and F2 will be transmitted to the buckle (8) through the shell, generating positive pressure F3 and F4 between a pair of mating buckles (8), thereby increasing the friction between the buckles (8) and making the buckles locked. When the airbag (6) is deflated, the pressure F3 and F4 between the buckles will drop to zero, and the buckles will be relaxed.

2. The industrial X-ray machine full-angle inspection fixture as described in claim 1, characterized in that, The latches (8) of the upper and lower cargo hemispheres do not overlap and are misaligned. Align the openings of the upper and lower cargo hemispheres and rotate the upper and lower cargo hemispheres to make the latches (8) overlap. Inflate the air bladder inside the cargo sphere to lock the latches (8).

3. The industrial X-ray machine full-angle inspection fixture as described in claim 1, characterized in that, The omnidirectional motion mechanism (2) includes: a drive shaft (9), a geared motor (10), a bearing seat (11), and a spherical omnidirectional wheel (12); the bearing seat (11) is used to support the drive shaft (9), the drive shaft (9) is equipped with a spherical omnidirectional wheel (12), one side of the drive shaft (9) is connected to the geared motor (10), and the spherical omnidirectional wheel (12) is driven to rotate by the rotation of the geared motor (10).

4. The industrial X-ray machine full-angle inspection fixture as described in claim 3, characterized in that, The spherical omnidirectional wheel (12) consists of three sets of wheels, with the two side wheel sets having a slightly larger diameter than the middle wheel. The edges of the three sets of wheels are in contact with the spherical shell (5) at the same time.

5. The industrial X-ray machine full-angle inspection fixture as described in claim 3, characterized in that, The three omnidirectional motion mechanisms (2) are arranged in a triangular pattern on the base (3).

6. The industrial X-ray machine full-angle inspection fixture as described in claim 3, characterized in that, The base rotation device (4) includes a drive gear (13) and a base drive motor (14); the drive gear (13) is fixedly connected to the output shaft of the base drive motor (14), and the drive gear (13) meshes with the external gear ring on the base (3); when the base drive motor (14) rotates, it drives the drive gear (13) to rotate, thereby driving the base (3) to rotate; the fixed angle rotation of the base (3) is achieved by the precise forward and reverse rotation of the base drive motor (14).

7. The industrial X-ray machine full-angle inspection fixture as described in claim 3, characterized in that, v1, v2, and v3 represent the velocities of the three sets of full-angle motion mechanisms (2) in the rotational output direction, respectively. The angle between v1, v2, and v3 is 120 degrees. v1 and v2 have components in the first and second directions, and -v3 is the same as in the second direction. If the rotation angle in the first and second directions is required to be (θ) x1 ,θ y1 When this is the case, the components of v1, v2, and v3 in the first and second directions need to satisfy the following: That's all.

8. The industrial X-ray machine full-angle inspection fixture as described in claim 1, characterized in that, The sphere (1) rotates in three directions through the combined action of the full-angle motion mechanism (2) and the base rotation device (4). The three directions are mutually orthogonal, thus realizing the rotation of the sphere in the full field of view.