Liquid bag shaking device
By designing a liquid bag shake device including a rack, pallet, swing mechanism, transmission mechanism and drive mechanism, the liquid components are fully mixed, the problem of red blood cell coagulation in the prior art is solved, and the processing requirements and noise of the device are reduced.
Patent Information
- Application Number
- CN202421930057.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-10
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-10
AI Technical Summary
The prior art is difficult to effectively mix the red blood cells and maintenance solution in the liquid bag, resulting in red blood cells coagulation and clumping, and the processing requirements of the shake device are high and the noise is high.
A liquid bag shaker device is designed, including a frame, a pallet, a swing mechanism, a transmission mechanism and a drive mechanism. The pallet achieves full mixing of liquid components through three-dimensional circumferential rotation.
Full mixing of liquid components is achieved to prevent red blood cells from coagulating and agglomerating, and the device processing requirements are low, the shake effect is good, and the noise is low.
Smart Images
Figure CN222900871U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of medical devices, and particularly to a liquid bag shaking device for fully mixing liquid components in a liquid bag, such as preservation liquid and red blood cells. Background Art
[0002] Before being stored, the red blood cells separated by a blood component separator need to be evenly mixed with the preservation liquid to avoid coagulation and caking of the red blood cells. Therefore, a shaking mechanism with simple operation, low processing requirements, good shaking effect, and low noise is particularly important. Summary of the Utility Model
[0003] The purpose of the present application is to overcome the deficiencies of the prior art and provide a liquid bag shaking device that can fully mix liquid components in the liquid bag, such as preservation liquid and red blood cells, prevent coagulation and caking of red blood cells, and has low processing requirements, good shaking effect, and low noise.
[0004] The embodiments of the present application solve the above problems through the following technical solutions.
[0005] This embodiment provides a liquid bag shaking device, which includes a frame and a tray, a swinging mechanism, a transmission mechanism, and a driving mechanism installed on the frame. The swinging mechanism includes an outer rotating ring, an inner rotating member, and a movable rotating shaft. The outer rotating ring is arranged on the frame and is rotatably connected to the frame. The inner rotating member is arranged inside the outer rotating ring and is rotatably connected to the outer rotating ring. The rotation axis of the outer rotating ring is perpendicular to the rotation axis of the inner rotating member. The tray is installed on the top of the inner rotating member, and the movable rotating shaft is installed at the bottom of the inner rotating member. The first end of the movable rotating shaft is rotatably connected to the inner rotating member, and the second end of the movable rotating shaft is connected to the driving mechanism through the transmission mechanism. The driving mechanism is used to drive the transmission mechanism to form an angle between the movable rotating shaft and the vertical direction and rotate the movable rotating shaft, thereby driving the tray to perform a three-dimensional circular rotation.
[0006] In some embodiments, the liquid bag shaking device further includes a tray support member. The tray is installed on the top of the inner rotating member through the tray support member, and the tray and the tray support member are detachably connected.
[0007] In some embodiments, the frame includes two support arms. Each of the two support arms is fixedly installed with a first flanged deep groove ball bearing. A first bushing is fixedly installed on each of a set of opposite sides of the outer rotating ring. The first flanged deep groove ball bearing is connected to the first bushing through a rotating shaft one by one. The rotation axis of the outer rotating ring is parallel to the horizontal plane. Second bushings are fixedly installed on each of the other set of opposite sides of the outer rotating ring. The inner rotating member is provided with a through hole, and a rotating shaft passes through the through hole and is fixedly connected to the inner rotating member. The two ends of the rotating shaft are respectively connected to the two second bushings one by one.
[0008] In some embodiments, the outer rotating ring is a square ring or a circular ring.
[0009] In some embodiments, a second flanged deep groove ball bearing is fixedly installed at the bottom of the inner rotating member, and the first end of the movable rotating shaft is installed in the second flanged deep groove ball bearing.
[0010] In some embodiments, the transmission mechanism includes a connecting rod, a sliding shaft, and a sliding shaft support seat. The sliding shaft support seat is rotatably installed on the frame. The sliding shaft vertically penetrates the sliding shaft support seat. A sliding pin is fixedly installed on the side wall of the sliding shaft. A vertical sliding groove matching the sliding pin is formed on the side wall of the sliding shaft support seat. The sliding shaft support seat rotates under the drive of the drive mechanism, the sliding shaft rotates under the drive of the sliding shaft support seat, the sliding shaft slides up and down along the vertical sliding groove under the drive of the drive mechanism. One end of the connecting rod is hinged to the first end of the sliding shaft, and the other end of the connecting rod is hinged to the second end of the movable rotating shaft.
[0011] In some embodiments, the transmission mechanism further includes a pulley shaft, a driven pulley, a driving pulley, and a belt. The drive mechanism is a motor. The pulley shaft is rotatably installed on the frame. The sliding shaft support seat penetrates the pulley shaft and is fixedly connected to the pulley shaft to rotate under the drive of the pulley shaft. The driving pulley is fixedly sleeved on the pulley shaft. The driving pulley is fixedly connected to the rotating shaft of the motor. The driving pulley is connected to the driven pulley through the belt.
[0012] In some embodiments, the frame includes a base. The base is provided with a through hole. A bearing is installed in the base. The outer ring of the bearing is fixedly connected to the inner wall of the through hole. The pulley shaft penetrates the bearing and is fixedly connected to the inner ring of the bearing.
[0013] In some embodiments, the transmission mechanism further includes a cylindrical cam and a sliding column. The cylindrical cam is fixedly connected to the second end of the sliding shaft. The cylindrical cam rotates under the drive of the sliding shaft. The sliding column is fixedly installed on the frame. A continuous sliding groove is formed around the outer side wall of the cylindrical cam. The inner diameter of the sliding groove is adapted to the outer diameter of the sliding column. The sliding column is slidably connected in the sliding groove. The sliding groove has a wave crest section and a wave trough section. The wave crest section and the wave trough section form a height difference.
[0014] When the cylindrical cam rotates to abut against the sliding column at the wave crest section, the sliding shaft slides down to make the movable rotating shaft in a vertical state and the tray in a horizontal state. When the cylindrical cam rotates to abut against the sliding column at the wave trough section, the sliding shaft slides up to make the movable rotating shaft form an angle with the vertical direction and the tray in an inclined state.
[0015] In some embodiments, the transmission mechanism further includes a cylindrical grooved wheel and a sliding column. The cylindrical grooved wheel is fixedly connected to the second end of the sliding shaft. The cylindrical grooved wheel rotates under the drive of the sliding shaft. The sliding column is fixedly installed on the frame. A continuous sliding groove with a constant height is formed around the outer side wall of the cylindrical grooved wheel. The inner diameter of the sliding groove is adapted to the outer diameter of the sliding column. The sliding column is slidably connected in the sliding groove.
[0016] When the cylindrical grooved wheel rotates, the sliding shaft does not slide, and the movable rotating shaft always forms an angle with the vertical direction, and the tray is in an inclined state.
[0017] Advantages of this application: The tray of the liquid bag shaking device in this application makes a three-dimensional circular rotation, and the liquid bags placed on the tray are shaken at multiple angles, achieving the purpose of fully mixing the liquid components in the liquid bag, such as the maintenance liquid and red blood cells. Moreover, the device has low processing requirements, good shaking effect, and low noise. Brief Description of the Drawings
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.
[0019] Figure 1 It is a schematic structural diagram of an embodiment of the liquid bag shaking device of this application;
[0020] Figure 2 It is Figure 1 a schematic structural diagram of the swinging mechanism in the liquid bag shaking device in
[0021] Figure 3 It is Figure 1 a schematic structural diagram of a part of the frame in the liquid bag shaking device in
[0022] Figure 4 It is Figure 1 a schematic structural diagram of the combination of a part of the frame and the swinging mechanism in the liquid bag shaking device in
[0023] Figure 5 It is Figure 4 an exploded view of the combination of a part of the frame and the swinging mechanism in
[0024] Figure 6 It is Figure 1 a usage state diagram of the liquid bag shaking device in
[0025] Figure 7 It is Figure 1 an exploded view of the liquid bag shaking device in
[0026] Figure 8 It is Figure 1 a schematic structural diagram of the combination of a part of the frame and a part of the transmission mechanism in the liquid bag shaking device in
[0027] Figure 9 It is Figure 8 an exploded view of the combination of a part of the frame and a part of the transmission mechanism in
[0028] Figure 10 This is a schematic structural diagram of another embodiment of the liquid bag shaking device of the present application. Detailed implementation manners
[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, terms such as "installation", "provided on", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0030] Refer to Figure 1 As shown, the liquid bag shaking device in the illustrated embodiment includes a frame 1, and a tray 2, a swing mechanism 3, a transmission mechanism 4, and a drive mechanism 5 that are directly or indirectly installed on the frame 1. Refer to Figure 2 As shown, the swing mechanism 3 includes an outer rotating ring 31, an inner rotating member 32, and a movable rotating shaft 33. Here, the frame 1 is understood in a broad sense, and the mounting brackets for mounting components are all part of the frame 1. Refer to Figures 3 to 5As shown in the figure, the outer rotating ring 31 is arranged on the frame 1 and is rotatably connected to the frame 1. Specifically, the frame 1 includes two support arms 11. First flanged deep groove ball bearings 34 are fixedly installed on both support arms 11. A first bushing 35 is fixedly installed on each of a set of opposite sides of the outer rotating ring 31. The first flanged deep groove ball bearings 34 are respectively connected to the first bushings 35 through rotating shafts 36. That is, the outer ring of the first flanged deep groove ball bearing 34 is fixedly connected to the support arm, the inner ring of the first flanged deep groove ball bearing 34 is fixedly connected to one end of the rotating shaft 36, and the inner ring of the first bushing 35 is rotatably connected to the other end of the rotating shaft 36. The rotating shaft 36 can rotate relative to both the support arm 11 and the outer rotating ring 31. The rotation axis of the outer rotating ring 31 is parallel to the horizontal plane. The inner rotating member 32 is arranged inside the outer rotating ring 31 and is rotatably connected to the outer rotating ring 31. Specifically, a second bushing 37 is fixedly installed on each of the other set of opposite sides of the outer rotating ring 31. The inner rotating member 32 is provided with a through hole, and a rotating shaft 38 passes through the through hole. The two ends of the rotating shaft 38 are respectively connected to the two second bushings 37. The rotating shaft 38 is fixed relative to the inner rotating member 32 and can rotate relative to the outer rotating ring 31. The rotation axis of the outer rotating ring 31 is perpendicular to the rotation axis of the inner rotating member 32. The tray 2 is installed on the top of the inner rotating member 32, and the movable rotating shaft 33 is installed at the bottom of the inner rotating member 32. The first end of the movable rotating shaft 33 is rotatably connected to the inner rotating member 32. Specifically, a second flanged deep groove ball bearing 39 is fixedly installed at the bottom of the inner rotating member 32, and the first end of the movable rotating shaft 33 is installed in the inner ring of the second flanged deep groove ball bearing 39. The axis of the movable rotating shaft 33 is perpendicular to the rotation axis of the inner rotating member 32. The second end of the movable rotating shaft 33 is connected to the driving mechanism 5 through the transmission mechanism 4. The driving mechanism 5 drives the transmission mechanism 4 to form an angle between the movable rotating shaft 33 and the vertical direction and make the movable rotating shaft 33 rotate. Since the first end of the movable rotating shaft 33 is rotatably connected to the inner rotating member 32 and forms an angle with the vertical direction, the movable rotating shaft rotates around its own axis while revolving around the inner rotating member 32.
[0031] In this embodiment, the outer rotating ring 31 is rotatably connected to the frame 1, enabling the outer rotating ring 31 to rotate in a certain direction. The inner rotating member 32 is rotatably connected to the outer rotating ring 31, and the rotation axis of the inner rotating member 32 is perpendicular to the rotation axis of the outer rotating ring 31, enabling the inner rotating member 32 to rotate in a direction perpendicular to the rotation direction of the outer rotating ring 31. The tray 2 is installed on the top of the inner rotating member 32, and the movable rotating shaft 33 forms an angle with the vertical direction, causing the tray 2 to tilt at a certain angle. The driving mechanism 5 drives the movable rotating shaft 33 to rotate through the transmission mechanism 4. Under the action of the outer rotating ring 31 and the inner rotating member 32, the tray 2 performs three-dimensional circular rotation, and the liquid bag placed on the tray 2 shakes at multiple angles, thereby achieving the purpose of fully mixing the liquid components in the liquid bag, such as the maintenance liquid and red blood cells. The motion mechanism of this embodiment does not adopt the design of a rocker-slider with relative sliding, but uses bearings and bushings for connection, making the device quieter and more stable during operation.
[0032] Reference Figure 5 As shown, the outer rotating ring 31 in the embodiment is a square ring, and one set of opposite sides is rotatably connected to the frame 1, and the other set of opposite sides is rotatably connected to the inner rotating member 32. In other embodiments (not shown in the figure), the outer rotating ring 31 is a circular ring, an elliptical ring or other shaped rings.
[0033] Reference Figure 6 As shown, in the illustrated embodiment, it further includes a tray support member 6. The tray 2 is installed on the top of the inner rotating member 32 through the tray support member 6, and the tray 2 and the tray support member 6 are detachably connected for replacing the tray 2.
[0034] Reference Figures 6 to 9 As shown, the transmission mechanism 4 includes a connecting rod 41, a sliding shaft 42, and a sliding shaft support seat 43. The sliding shaft support seat 43 is rotatably installed on the frame 1. The sliding shaft 42 vertically penetrates the sliding shaft support seat 43. A sliding pin 421 is provided on the side wall of the sliding shaft 42, and a vertical sliding groove 431 matching the sliding pin 421 is provided on the sliding shaft support seat 43. The sliding shaft support seat 43 rotates under the indirect drive of the driving mechanism 5. The sliding shaft 42 rotates with the sliding shaft support seat 43 driven by the sliding shaft support seat 43. The sliding shaft 42 slides up and down along the vertical sliding groove 431 under the indirect drive of the driving mechanism 5. One end of the connecting rod 41 is hinged to the first end of the sliding shaft 42, and the other end of the connecting rod 41 is hinged to the second end of the movable rotating shaft 33. When the sliding shaft 42 slides upward, the connecting rod 41 pushes the second end of the movable rotating shaft 33 upward to form an angle with the vertical direction. At this time, the tray 2 tilts at a certain angle. When the sliding shaft 42 slides downward, the connecting rod 41 pulls the second end of the movable rotating shaft 33 downward to be in a vertical state. At this time, the tray 2 is in a horizontal state.
[0035] The sliding shaft support base 43 is rotatably mounted on the frame 1. Specifically, the transmission mechanism 4 further includes a pulley shaft 44, a driven pulley 45, a driving pulley 46, and a belt 47, and the driving mechanism 5 is a motor 5. The frame 1 includes a base 12, and the base 12 is integrally formed with or separately connected to the support arm 11. The base 12 is provided with a through hole, and a bearing 13 is installed inside the base 12. The outer ring of the bearing 13 is fixedly connected to the inner wall of the through hole, and the pulley shaft 44 passes through the bearing 13 and is fixedly connected to the inner ring of the bearing 13. The sliding shaft support base 43 passes through the pulley shaft 44 and is fixedly connected to the pulley shaft 44 to rotate driven by the pulley shaft 44. The driving pulley 46 is fixedly sleeved on the pulley shaft 44, and the driving pulley 46 is fixedly connected to the rotating shaft of the motor 5. The driving pulley 46 is connected to the driven pulley 45 through the belt 47. Therefore, the driving mechanism 5 drives the sliding shaft support base 43 to rotate through the driving pulley 46, the belt 47, the driven pulley 45, and the pulley shaft 44.
[0036] Referring Figures 6 to 10 As shown, the transmission mechanism 4 further includes a cylindrical cam 48 and a sliding column 49. The cylindrical cam 48 is fixedly connected to the second end of the sliding shaft 42. The cylindrical cam 48 rotates driven by the sliding shaft 42. The sliding column 49 is fixedly installed on the frame 1. A continuous chute is circumferentially formed on the outer side wall of the cylindrical cam 48. The inner diameter of the chute is adapted to the outer diameter of the sliding column 49. The sliding column 49 is slidably connected in the chute. The chute has a peak section 481 and a valley section 482, and the peak section 481 and the valley section 482 form a height difference. Referring Figure 10 As shown, when the motor 5 rotates, the sliding shaft support base 43 rotates, the sliding shaft support base 43 drives the sliding shaft 42 to rotate, the sliding shaft 42 drives the cylindrical cam 48 to rotate. During the process that the cylindrical cam 48 rotates to abut against the sliding column 49 at the peak section 481, due to the effect of the sliding column 49, the cylindrical cam 48 descends, the cylindrical cam 48 drives the sliding shaft 42 to slide down, the sliding shaft 42 drives the connecting rod 41 to move down, and the connecting rod 41 drives the second end of the movable rotating shaft 33 to move down. When the cylindrical cam 48 rotates to abut against the sliding column 49 at the peak section 481, the movable rotating shaft 33 is in a vertical state and the tray 2 is in a horizontal state. The liquid bag shaking device in this embodiment realizes horizontal control for placing the liquid bag. Referring Figure 6 As shown, during the process that the cylindrical cam 48 rotates to abut against the sliding column 49 at the valley section 482, due to the effect of the sliding column 49, the cylindrical cam 48 rises, the cylindrical cam 48 drives the sliding shaft 42 to slide up, the sliding shaft 42 drives the connecting rod 41 to move up, and the connecting rod 41 drives the second end of the movable rotating shaft 33 to move up. When the cylindrical cam 48 rotates to abut against the sliding column 49 at the valley section 482, the movable rotating shaft 33 forms an angle with the vertical direction. At this time, the tray 2 tilts at a certain angle, thereby driving the tray 2 to perform a three-dimensional rotational movement at a certain angle. In this way, the three-dimensional rotation and horizontal control are realized in a cycle, and the functions of shaking the liquid bag and facilitating the placement of the liquid bag are realized.
[0037] Reference Figures 6 to 9 As shown, the transmission mechanism 4 further includes a cylindrical grooved pulley 410 and a sliding column 49. The cylindrical grooved pulley 410 is fixedly connected to the second end of the sliding shaft 42. The cylindrical grooved pulley 410 rotates driven by the sliding shaft 42. The sliding column 49 is fixedly installed on the frame 1. A continuous groove with a constant height is circumferentially formed on the outer side wall of the cylindrical grooved pulley 410. The inner diameter of the groove is adapted to the outer diameter of the sliding column 49. The sliding column 49 is slidably connected in the groove. Since the height of the groove is constant and there is only a trough section, when the cylindrical grooved pulley 410 rotates, the sliding shaft 42 does not slide, and the movable rotating shaft 33 always forms an angle with the vertical direction, and the tray 2 is in an inclined state. In this way, three-dimensional rotation is realized, and the function of shaking the liquid bag is realized.
[0038] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.
Claims
1. A liquid bag shaking device, characterized in that: The cam is connected to the chassis and the cam is connected to the chassis by a screw threading mechanism, wherein the cam is connected to the chassis via a screw threading mechanism and the cam is connected to the chassis via a screw threading mechanism.
2. The liquid bag shaking device according to claim 1, characterized in that: It also includes a tray support, through which the tray is installed on the top of the inner rotating member, and the tray and the tray support are detachably connected.
3. The liquid bag shaking device according to claim 1, characterized in that: The frame includes two support arms, both of which are fixedly installed with a first flanged deep groove ball bearing, one group of opposite sides of the outer rotating ring are each fixedly installed with a first sleeve, the first flanged deep groove ball bearing is connected to the first sleeve one by one through a rotating shaft, and the rotation axis of the outer rotating ring is parallel to the horizontal plane; another group of opposite sides of the outer rotating ring are each fixedly installed with a second sleeve, the inner rotating part is provided with a through hole, and a rotating shaft is also provided to penetrate the through hole and is fixedly connected to the inner rotating part, and both ends of the rotating shaft are respectively connected to the two second sleeves one by one.
4. The liquid bag shaking device according to claim 3, characterized in that: The outer rotating ring is a square ring or a circular ring.
5. The liquid bag shaking device according to claim 1, characterized in that: A second flanged deep groove ball bearing is fixedly mounted on the bottom of the inner rotating member, and the first end of the movable rotating shaft is mounted on the second flanged deep groove ball bearing.
6. The liquid bag shaking device according to claim 1, characterized in that: The transmission mechanism includes a connecting rod, a sliding shaft, and a sliding shaft support seat. The sliding shaft support seat can be rotatably installed on the frame. The sliding shaft vertically penetrates the sliding shaft support seat. A sliding pin is fixedly installed on the side wall of the sliding shaft. A vertical sliding groove matching the sliding pin is opened on the side wall of the sliding shaft support seat. The sliding shaft support seat rotates under the drive of the driving mechanism, and the sliding shaft rotates driven by the sliding shaft support seat. The sliding shaft slides up and down along the vertical sliding groove under the drive of the driving mechanism. One end of the connecting rod is hinged to the first end of the sliding shaft, and the other end of the connecting rod is hinged to the second end of the movable rotating shaft.
7. The liquid bag shaking device according to claim 6, characterized in that: The transmission mechanism also includes a pulley shaft, a driven pulley, a driving pulley and a belt. The driving mechanism is a motor. The pulley shaft is rotatably mounted on a frame. The sliding shaft support seat passes through the pulley shaft and is fixedly connected to the pulley shaft so as to rotate under the drive of the pulley shaft. The driving pulley is fixedly sleeved on the pulley shaft. The driving pulley is fixedly connected to the rotating shaft of the motor. The driving pulley is connected to the driven pulley through the belt.
8. The liquid bag shaking device according to claim 7, characterized in that: The frame includes a base, the base is provided with a through hole, a bearing is installed in the base, the outer ring of the bearing is fixedly connected to the inner wall of the through hole, and the pulley shaft passes through the bearing and is fixedly connected to the inner ring of the bearing.
9. The liquid bag shaking device according to claim 6, characterized in that: The transmission mechanism also includes a cylindrical cam and a sliding column, the cylindrical cam is fixedly connected to the second end of the sliding shaft, the cylindrical cam rotates under the drive of the sliding shaft, the sliding column is fixedly installed on the frame, the outer wall of the cylindrical cam is surrounded by a circle of continuous sliding grooves, the inner diameter of the sliding grooves is adapted to the outer diameter of the sliding column, the sliding column is slidably connected in the sliding grooves, the sliding grooves have a peak section and a trough section, and the peak section and the trough section form a height difference; When the cylindrical cam rotates to the point where the peak section abuts against the sliding column, the sliding shaft slides down so that the movable shaft is in a vertical state and the tray is in a horizontal state; when the cylindrical cam rotates to the point where the trough section abuts against the sliding column, the sliding shaft slides up so that the movable shaft forms an angle with the vertical direction and the tray is in an inclined state.
10. The liquid bag shaking device according to claim 6, characterized in that: The transmission mechanism also includes a cylindrical groove wheel and a sliding column, the cylindrical groove wheel is fixedly connected to the second end of the sliding shaft, the cylindrical groove wheel rotates under the drive of the sliding shaft, the sliding column is fixedly installed on the frame, the outer side wall of the cylindrical groove wheel is surrounded by a circle of continuous sliding grooves with constant height, the inner diameter of the sliding groove is adapted to the outer diameter of the sliding column, and the sliding column is slidably connected in the sliding groove; When the cylindrical groove wheel rotates, the sliding shaft does not slide, the movable rotating shaft always forms an angle with the vertical direction, and the tray is in an inclined state.