Eye detection device integrated with a slit lamp

Abstract

The invention discloses an eye detection device with an integrated slit lamp assembly, comprising a fundus camera, a slit lamp assembly, a base and a platform for placing the fundus camera and the slit lamp assembly, the platform is movably connected to the base, the fundus camera is slidably connected to the platform, an arc guide rail, a connecting rod and a first motor are arranged on the platform at a position corresponding to the slit lamp assembly, a linear guide rail is arranged on the connecting rod, the slit lamp assembly passes through the arc guide rail and the linear guide rail, one end of the connecting rod is fixedly connected to the first motor, and the other end is arranged at a position corresponding to the arc guide rail, and swings along an arc trajectory with one end of the connecting rod fixed to the first motor as the center, the first motor drives the connecting rod to swing and drives the slit lamp assembly to move along the arc guide rail, the slit lamp assembly is arranged at least corresponding to one side of the fundus camera, the fundus camera moves close to or away from the position of a human eye, and the fundus camera and the slit lamp assembly move in a staggered manner. The eye detection device has high flexibility, stable movement and diverse functions.

Description

Technical Field

[0001] The present invention relates to the technical field of eye detection devices, and in particular to an eye detection device integrated with a slit lamp assembly. Background Art

[0002] In ophthalmic examination, fundus camera and slit lamp are two important detection tools. Fundus camera is used to observe the blood vessels, retina and other structures of the fundus, while slit lamp is used to examine the anterior segment structures such as cornea and lens. In traditional inspection equipment, because of certain requirements on volume, the slit lamp and fundus camera are large in size after being integrated together, which is not convenient to integrate into one device or even if integrated into one device, it will cause the volume to be too large. Therefore, slit lamp and fundus camera are usually used separately, and the detection angle and position need to be adjusted manually, which makes it difficult to achieve flexible adjustment. Even for eye detection devices that integrate slit lamp and fundus camera, the movement path and movement conditions between other components are difficult to set, and friction and collision are prone to occur inside the narrow detection device. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a device to solve the problems mentioned in the above background technology that the traditional eye detection device has no integrated slit lamp assembly, the slit lamp is not flexible, the structure is not compact, and the function is single.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an eye detection device with an integrated slit lamp assembly, comprising a fundus camera, a slit lamp assembly, a base and a platform for placing the fundus camera and the slit lamp assembly, the platform is movably connected to the base, the fundus camera is slidably connected to the platform, an arc guide rail, a connecting rod and a first motor are arranged on the platform corresponding to the position of the slit lamp assembly, a linear guide rail is arranged on the connecting rod, the slit lamp assembly passes through the arc guide rail and the linear guide rail, one end of the connecting rod is fixedly connected to the first motor, and the other end is arranged corresponding to the position of the arc guide rail, and swings in an arc trajectory along the end fixed to the first motor as the center of the circle, the first motor drives the connecting rod to swing and drives the slit lamp assembly to move along the arc guide rail, the slit lamp assembly is arranged at least corresponding to one side of the fundus camera, the fundus camera moves close to or away from the position of the human eye, the slit lamp assembly moves in an oblique straight line with the position of the human eye, and the fundus camera and the slit lamp assembly move staggered with each other.

[0005] As a further improvement of the present invention, an oblique slide, at least one slider, and a second motor for driving the slider to slide are obliquely arranged on both sides of the platform corresponding to the fundus camera. The slider is connected to the oblique slide to drive the arc guide rail to move obliquely towards or away from the human eye position.

[0006] As a further improvement of the present invention, the second motor is provided with a helical gear. One side of the slider is connected to the arc-shaped guide rail, and the other side is provided with a helical rack for meshing with the helical gear. The second motor drives the slider to slide, so as to drive the arc-shaped guide rail to move obliquely in the direction close to or away from the human eye.

[0007] As a further improvement of the present invention, the slit lamp assembly includes two left slit lamp assemblies respectively arranged on the left side of the fundus camera corresponding to the position of the left eye of the human body and two right slit lamp assemblies respectively arranged on the right side of the fundus camera corresponding to the position of the right eye of the human body. The left slit lamp assembly, the right slit lamp assembly and the fundus camera are staggered from each other.

[0008] As a further improvement of the present invention, the slit lamp assembly includes two left slit lamp assemblies respectively arranged on the left side of the fundus camera corresponding to the position of the left eye of the human body and two right slit lamp assemblies respectively arranged on the right side of the fundus camera corresponding to the position of the right eye of the human body. The left slit lamp assembly, the right slit lamp assembly and the fundus camera are staggered from each other.

[0009] As a further improvement of the present invention, a belt, a pulley set and a third motor are arranged between the platform and the base. The belt is sleeved on the pulley set, the belt is connected to the platform, and the third motor drives the belt to rotate to drive the platform to move.

[0010] As a further improvement of the present invention, the belt is provided with fixing blocks for fixedly connecting with the platform. The fixing blocks and the platform are fixed by bolts. The belt is placed between the fixing blocks and the platform, and the fixing blocks and the platform cooperate to clamp the belt.

[0011] As a further improvement of the present invention, at least one zero-position sensor is arranged corresponding to the end position of the arc-shaped guide rail, and the connecting rod can cooperate with the zero-position sensor for induction.

[0012] As a further improvement of the present invention, the inner walls on both sides in the length direction of the arc-shaped guide rail are arranged at equal intervals.

[0013] As a further improvement of the present invention, the slit lamp assembly includes a lamp body, an upper top plate arranged corresponding to the upper part of the lamp body, and a lower bottom plate arranged corresponding to the lower part of the lamp body. A limiting ring opening for clamping with the arc-shaped guide rail is formed between the upper top plate and the lower bottom plate. A plurality of groups of balance rollers are arranged between the arc-shaped guide rail and the limiting ring opening. The outer peripheral wall of the balance roller abuts against the inner peripheral wall of the arc-shaped guide rail and can roll along the inner peripheral wall of the arc-shaped guide rail.

[0014] Compared with the prior art, the present invention provides an eye detection device with an integrated slit lamp assembly, which has the following beneficial effects: the platform of the present invention is movably connected to the base, and the fundus camera can slide on the platform. The distance between the fundus camera and the human eye can be flexibly adjusted according to the detection requirements, so as to facilitate the shooting of fundus images at different positions; at the same time, the slit lamp assembly can move obliquely and linearly along the arc guide rail and the linear guide rail, and the two move in a staggered manner, thereby improving the flexibility of detection, reducing the detection time, and improving the overall detection efficiency. The arc guide rail is arranged to cooperate with the first motor to drive the connecting rod to swing, so that the slit lamp assembly can accurately adjust the position, so that the doctor can observe various positions of the eye more clearly during the detection, reducing the detection blind spot, and the combination of the arc guide rail and the linear guide rail can provide support for the movement of the slit lamp assembly, making the movement more stable and reducing the difficulty of operation. The automatic control can reduce the labor cost, and the eye detection device with an integrated slit lamp assembly provided by the invention has a more compact structure, can meet the requirements of volume, and integrate the slit lamp assembly and the fundus camera, and has more diversified functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A perspective view of the present invention;

[0016] Figure 2 FIG. 1 is a diagram of the present invention Figure 1 A three-dimensional diagram of the structure of part A;

[0017] Figure 3 is a stereoscopic diagram of the slit lamp of the present invention;

[0018] Figure 4 It is a bottom structure diagram of the present invention;

[0019] Figure 5 It is a partial stereoscopic view of the slit lamp assembly of the present invention.

[0020] Figure numbers: 1. fundus camera; 2. slit lamp assembly; 3. platform; 4. base; 5. arc guide rail; 6. connecting rod; 7. linear guide rail; 8. first motor; 21. lamp body; 22. upper top plate; 23. lower bottom plate; 24. limit ring; 25. balance roller; 31. oblique slide; 32. slider; 33. second motor; 34. belt; 35. pulley set; 36. third motor; 37. fixed block 331. bevel gear; 321. bevel rack; 51. zero position sensor. DETAILED DESCRIPTION

[0021] The present invention will be further described below in detail with reference to the embodiments shown in the accompanying drawings.

[0022] As shown in the figure, an eye detection device integrated with a slit lamp assembly 2 includes a fundus camera 1, a slit lamp assembly 2, a base 4, and a platform 3 for placing the fundus camera 1 and the slit lamp assembly 2. The platform 3 is movably connected to the base 4, and the fundus camera 1 is slidably connected to the platform 3. An arc guide rail 5, a connecting rod 6, and a first motor 8 are arranged on the platform 3 at a position corresponding to the slit lamp assembly 2. A linear guide rail 7 is arranged on the connecting rod 6. The slit lamp assembly 2 passes through the arc guide rail 5 and the linear guide rail 7. The connecting rod 6 is a first motor 8. One end is fixedly connected to the first motor 8, and the other end is arranged corresponding to the position of the arc guide rail 5, and swings along the connecting rod 6 with one end fixed to the first motor 8 as the center of the circle in an arc trajectory, the first motor 8 drives the connecting rod 6 to swing and drives the slit lamp assembly 2 to move along the arc guide rail 5, the slit lamp assembly 2 is arranged at least corresponding to one side of the fundus camera 1, the fundus camera 1 moves close to or away from the position of the human eye, the slit lamp assembly 2 moves in an oblique straight line with the position of the human eye, and the fundus camera 1 and the slit lamp assembly 2 move in a staggered manner.

[0023] The eye detection device is mainly composed of a fundus camera 1, a slit lamp assembly 2, a base 4 and a platform 3. Before using the device, first place the device stably in a suitable detection position; when implementing the scheme, it is necessary to perform an eye test on the patient, and at this time, the power needs to be turned on. Since the platform 3 is movably connected to the base 4, the operator can make a preliminary adjustment to the position of the platform 3 according to the actual position of the patient to ensure that the device as a whole is in a state that is convenient for detection; during the detection, the fundus camera 1 is controlled to move closer to or away from the human eye along the slide rail on the platform 3, so that the fundus camera 1 reaches a suitable shooting position. At the same time, the first motor 8 is started, and the first motor 8 drives the connecting rod 6 to swing. Since one end of the connecting rod 6 is fixed to the first motor 8 and the other end is arranged along the arc guide rail 5, when the connecting rod 6 swings, it drives the slit lamp assembly 2 to move along the arc guide rail 5. Since the slit lamp assembly 2 passes through the linear guide rail 7, during the swinging process of the connecting rod 6, the slit lamp assembly 2 can also be fine-tuned along the linear guide rail 7 to achieve oblique linear movement with the position of the human eye. In this process, the fundus camera 1 and the slit lamp assembly 2 move staggered to avoid interference between the two during the movement. For example, when the fundus camera 1 is detecting the position of the human eye, the fundus camera 1 needs to move closer to or away from the human eye. At this time, the slit lamp assembly 2 will not move to avoid collision with the fundus camera 1. Conversely, when the slit lamp assembly 2 detects the position of the human eye, the fundus camera 1 will not move, and the two are staggered. In this way, the fundus camera 1 can clearly capture the patient's fundus image, and the slit lamp assembly 2 can illuminate the patient's eyes from multiple angles, making it convenient for doctors to observe the eye condition from different angles and obtain more comprehensive eye detection information. The eye detection device of this scheme not only realizes multi-directional detection of the eye through the coordinated operation of various components, but also is easy to operate, and can effectively improve the detection efficiency and accuracy.

[0024] As a specific embodiment of the improvement, on both sides of the platform 3 corresponding to the fundus camera 1, an inclined slide 31, at least one slider 32, and a second motor 33 for driving the slider 32 to slide are inclinedly arranged. The slider 32 is connected to the inclined slide 31 to drive the arc-shaped guide rail 5 to move obliquely closer to or away from the human eye position.

[0025] When implementing this solution, the inclined slide 31 and the slider 32 are set to cooperate, and the second motor 33 is used to drive the slider 32 to slide on the inclined slide 31 and then drive the arc-shaped guide rail 5 to move. The operation method is simple, the moving positions are diverse, and the human eye position can be detected from different angles, with higher flexibility.

[0026] As a specific embodiment of the improvement, the second motor 33 is provided with a helical gear 331. One side of the slider 32 is connected to the arc-shaped guide rail 5, and the other side is provided with a helical rack 321 for meshing with the helical gear 331. The second motor 33 drives the slider 32 to slide to drive the arc-shaped guide rail 5 to move obliquely closer to or away from the human eye direction.

[0027] When implementing this solution, preferably, the second motor 33 is used as the power to drive the cooperation between the helical gear 331 and the helical rack 321. This structure can make the sliding of the slide more smooth and the sliding speed uniform. When implementing this solution, those skilled in the art can position the helical rack 321 and the helical gear 331 by setting guide rails, guide grooves, magnetic attraction, etc. to avoid poor contact between the helical gear 331 and the helical rack 321. If no guide groove or guide rail is set, preferably, the helical gear 331 or the helical rack 321 is made of magnetic attraction material so that they can generate magnetic attraction when they come into contact.

[0028] As a specific embodiment of the improvement, the slit lamp assembly 2 is two, namely a left slit lamp assembly 2 arranged on the left side of the fundus camera 1 corresponding to the left eye position of the human body and a right slit lamp assembly 2 arranged on the right side of the fundus camera 1 corresponding to the right eye position of the human body. The left slit lamp assembly 2, the right slit lamp assembly 2, and the fundus camera 1 are staggered from each other and move.

[0029] When this scheme is implemented, the slit lamp assembly 2 arranged on both sides of the fundus camera 1 of this scheme is one on the left and one on the right, and the slit lamp assembly 2 on the left is arranged for detecting the left eye of the human body, and the one on the right is arranged for detecting the right eye of the human body, and the moving position relationship of the fundus lamp and the slit lamp assembly 2 involved in any of the following schemes or improvements is implemented according to the movement method of the fundus lamp and the slit lamp assembly 2 of this scheme, the moving trajectory of the fundus camera 1 is a straight line and is close to or away from the position of the human eye, which is used to adjust the distance between it and the human eye so as to perform fundus imaging in the working position, the moving trajectory of the two slit lamp assemblies 2 is an oblique straight line, and the oblique angle thereof can be adjusted according to the actual inspection requirements to ensure that the best lighting angle and position can be provided for the fundus camera 1 during the inspection process, that is, when the fundus camera 1 is detecting the human eye, the fundus camera 1 moves to a position close to the human eye, at which time the left slit lamp assembly 2 and the right slit lamp assembly 2 cannot be directed toward the part close to the human eye. The fundus camera 1 and the slit lamp assembly 2 are moved to avoid the two meeting each other. On the contrary, when the slit lamp assembly 2 is detecting the position of the human eye, one of the two slit lamp assemblies 2 is close to the human eye position to detect one of the eyes. At this time, the other assembly will not approach the human eye position until the eye being detected completes the detection. For example, when the left slit lamp assembly 2 is detecting the left eye, the right slit lamp assembly 2 will not approach the human eye position until the eye being detected completes the detection. This design makes the fundus camera 1 and the slit lamp assembly 2 not interfere with each other during the movement, and can flexibly adjust the position to meet the needs of different ophthalmic examinations. Through this structural design, the fundus camera 1 and the slit lamp assembly 2 can achieve coordinated movement to improve the efficiency and accuracy of ophthalmic examinations. This solution adopts the arrangement of an oblique slide 31 and a slider 32 for sliding cooperation. When the left / right slit lamp assembly 2 moves, the slider 32 can also move and adjust the position according to actual detection needs.

[0030] As an improved specific implementation, the slit lamp assembly 2 is composed of two left slit lamp assemblies 2 arranged on the left side of the fundus camera 1 corresponding to the position of the left eye of the human body, and a right slit lamp assembly 2 arranged on the right side of the fundus camera 1 corresponding to the position of the right eye of the human body. The left slit lamp assembly 2, the right slit lamp assembly 2 and the fundus camera 1 move in an offset manner.

[0031] When this solution is implemented, there is one slit lamp assembly 2 on each side of the fundus camera 1, i.e., one on the left and one on the right. The slit lamp assembly 2 on the left is set for detecting the left eye of the human body, and the one on the right is set for detecting the right eye of the human body. Moreover, the moving position relationship between the fundus lamp and the slit lamp assembly 2 involved in any of the following solutions or improvements is implemented according to the moving mode of the fundus lamp and the slit lamp assembly 2 in this solution. The moving trajectory of the fundus camera 1 is a straight line and it moves closer to or farther away from the human eye position to adjust its distance from the human eye for fundus imaging at the working position. The moving trajectories of the two slit lamp assemblies 2 are oblique straight lines, and their oblique angles can be adjusted according to actual inspection requirements to ensure that the best illumination angle and position can be provided for the fundus camera 1 during the inspection process. That is, when the fundus camera 1 detects the human eye, the fundus camera 1 moves closer to the human eye position. At this time, the left slit lamp assembly 2 and the right slit lamp assembly 2 cannot move closer to the human eye position to avoid their meeting. Conversely, when the slit lamp assembly 2 detects the human eye position, one of the two slit lamp assemblies 2 moves closer to the human eye position to detect one of the eyes. At this time, the other slit lamp assembly will not move closer to the human eye position until the detected eye completes the detection. For example, when the left slit lamp assembly 2 detects the left eye, the right slit lamp assembly 2 will not move closer to the human eye position until the detected eye completes the detection. This design enables the fundus camera 1 and the slit lamp assembly 2 to not interfere with each other during the movement process, and at the same time can flexibly adjust the position to meet the requirements of different ophthalmic examinations. Through this structural design, the fundus camera 1 and the slit lamp assembly 2 can achieve coordinated movement, improving the efficiency and accuracy of ophthalmic examinations.

[0032] As a specific implementation of the improvement, a belt 34, a pulley group 35 and a third motor 36 are provided between the platform 3 and the base 4. The belt 34 is sleeved on the pulley group 35, the belt 34 is connected to the platform 3, and the third motor 36 drives the belt 34 to rotate to drive the platform 3 to move.

[0033] When this solution is implemented, by using the third motor 36 to drive the pulley group 35 to rotate to drive the belt 34 to rotate, when the belt 34 rotates, the components fixedly connected to the belt 34 can also move in cooperation with it. In this solution, when the belt 34 rotates, it can drive the platform 3 to move, with a simple structure and convenient movement.

[0034] As a specific implementation of the improvement, the belt 34 is provided with a fixing block 37 for fixedly connecting with the platform 3. The fixing block 37 is fixed to the platform 3 by bolts. The belt 34 is placed between the fixing block 37 and the platform 3, and the fixing block 37 and the platform 3 cooperate to clamp the belt 34.

[0035] In the implementation of this solution, a fixed block 37 and a bolt are used in cooperation to clamp the belt 34. Those skilled in the art can first place the fixed block 37 at the fixed position on the platform 3, and then position the platform 3 and the fixed block 37 through the bolt. At this time, the bolt cannot be fully tightened. It is necessary to first pass the belt 34 through the space between the fixed block 37 and the platform 3, and then tighten the fixed block 37 and the bolt so that the fixed block 37 and the platform 3 can clamp and position the belt 34. The installation method is simple and the operation is convenient.

[0036] As a specific improvement embodiment, at least one zero-position sensor 51 is provided corresponding to the end position of the arc-shaped guide rail 5, and the connecting rod 6 can cooperate with the zero-position sensor 51 for induction.

[0037] In the implementation of this solution, preferably, one zero-position sensor 51 is provided and is arranged corresponding to the end position of the arc-shaped guide rail 5. When the zero-position sensor 51 senses the connecting rod 6, the zero-position sensor 51 emits a signal to ensure that the slit lamp assembly 2 can pause moving or accurately return to the initial position. By adopting these structures, the slit lamp assembly 2 can achieve fast and accurate position adjustment in scenarios such as ophthalmic examinations, meet different examination requirements and stop the movement of the connecting rod 6, and can effectively protect the equipment.

[0038] As a specific improvement embodiment, the inner walls on both sides in the length direction of the arc-shaped guide rail 5 are arranged at equal distances.

[0039] In the implementation of this solution, preferably, the distance between the inner walls on both sides in the length direction of the arc-shaped guide rail 5 is arranged at equal distances. Such a structure can make the slit lamp move more smoothly in the arc-shaped guide rail 5, not easily come out of the arc-shaped guide rail 5, and the connection is more stable.

[0040] As a specific improvement embodiment, the slit lamp assembly 2 includes a lamp body 21, an upper top plate 22 provided corresponding to the upper part of the lamp body 21, and a lower bottom plate 23 provided corresponding to the lower part of the lamp body 21. A limiting ring opening 24 for clamping with the arc-shaped guide rail 5 is formed between the upper top plate 22 and the lower bottom plate 23. A plurality of groups of balance rollers 25 are arranged between the arc-shaped guide rail 5 and the limiting ring opening 24, and the outer peripheral wall of the balance roller 25 abuts against the inner peripheral wall of the arc-shaped guide rail 5 and can roll along the inner peripheral wall of the arc-shaped guide rail 5.

[0041] When this solution is implemented, the slit lamp assembly 2 moves along the arc-shaped guide rail 5, and the balance roller 25 rolls on the inner peripheral wall of the arc-shaped guide rail 5 to ensure that the slit lamp assembly 2 can move smoothly. The design of the limit ring opening 24 prevents the slit lamp assembly 2 from shaking up and down during movement, further improving the stability of movement. Through this structural design, the slit lamp assembly 2 can achieve precise and smooth movement on the arc-shaped guide rail 5. The number of balance rollers 25 in this solution is preferably four, and they are respectively arranged corresponding to four different directions of the slit lamp to ensure that the slit lamp does not shake during sliding.

[0042] The above description is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. An eye detection device integrated with a slit lamp assembly, characterized in that, The invention comprises a fundus camera, a slit lamp assembly, a base and a platform for placing the fundus camera and the slit lamp assembly, wherein the platform is movably connected to the base, the fundus camera is slidably connected to the platform, an arc guide rail, a connecting rod and a first motor are arranged on the platform at a position corresponding to the slit lamp assembly, a linear guide rail is arranged on the connecting rod, the slit lamp assembly passes through the arc guide rail and the linear guide rail, one end of the connecting rod is fixedly connected to the first motor, and the other end is arranged at a position corresponding to the arc guide rail, and the connecting rod swings along an arc track with one end fixed to the first motor as the center, and the first motor drives the connecting rod to rotate. The swing of the connecting rod drives the slit lamp assembly to move along the arc guide rail, the slit lamp assembly is arranged at least corresponding to one side of the fundus camera, the fundus camera moves close to or away from the human eye position, the slit lamp assembly and the human eye position move in an oblique straight line, the fundus camera and the slit lamp assembly move staggered with each other, an oblique slide seat, at least one slider, and a second motor for driving the slider to slide are obliquely arranged on both sides of the platform corresponding to the fundus camera, the slider is connected to the oblique slide seat to drive the arc guide rail to move obliquely close to or away from the human eye position.

2. The eye detection device integrating a slit lamp assembly according to claim 1, wherein, The second motor is provided with a bevel gear, one side of the slider is connected to the arc guide rail, and the other side is provided with a bevel rack for meshing with the bevel gear. The second motor drives the slider to slide to drive the arc guide rail to move obliquely towards or away from the human eye.

3. The eye detection device with an integrated slit lamp assembly according to claim 1 or 2, characterized in that, The slit lamp assembly comprises two components, a left slit lamp assembly corresponding to the position of the left eye of the human body and arranged on the left side of the fundus camera, and a right slit lamp assembly corresponding to the position of the right eye of the human body and arranged on the right side of the fundus camera. The left slit lamp assembly, the right slit lamp assembly and the fundus camera move in a staggered manner.

4. The eye detection device integrating a slit lamp assembly according to claim 1 or 2, characterized in that, The arc-shaped guide rail is provided with at least one zero position sensor corresponding to its end position, and the connecting rod can cooperate with the zero position sensor for sensing.

5. The eye detection device integrating a slit lamp assembly according to claim 1, wherein, The inner walls on both sides of the arc-shaped guide rail are arranged equidistantly in the length direction.

6. The eye detection device integrating a slit lamp assembly according to claim 1 or 2 or 5, characterized in that, The slit lamp assembly includes a lamp body, an upper top plate arranged at a position corresponding to the upper part of the lamp body, and a lower bottom plate arranged at a position corresponding to the lower part of the lamp body, a limiting ring opening for engaging with an arc guide rail is formed between the upper top plate and the lower bottom plate, a plurality of groups of balancing rollers are arranged between the arc guide rail and the limiting ring opening, and the outer peripheral wall of the balancing rollers abuts against the inner peripheral wall of the arc guide rail and can roll along the inner peripheral wall of the arc guide rail.

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