Protective device for radioactive source in radiology department

Abstract

The invention relates to the technical field of medical instruments, in particular to a protective device for a radioactive source in the radiology department, which comprises a base, and a support rod is fixedly mounted on the upper end surface of the base; the top of the supporting rod is fixedly connected with a top plate through an extension plate; three supports are fixed to the edge of the lower end face of the top plate at equal intervals. Each support is provided with a set of adjusting assemblies. An annular driving plate is mounted on the lower end surface of the top plate in a sliding manner; an inner meshing driving gear is slidably mounted on the front side of the supporting rod and located below the top plate. A plurality of groups of winding assemblies are mounted on the internal meshing driving gear; rollers are mounted at four corners of the bottom of the base; and a driving assembly is mounted on the top plate. The device is movable, the device can be moved according to the requirements of medical staff, in addition, the protective curtain can be selectively folded and unfolded according to the treatment condition, only the protective curtain needs to be rolled when the device is not used, and the convenience and practicability of the device are improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically to a protective device for radiation sources in radiology departments. Background Technology

[0002] X-ray examination is a common medical diagnostic tool widely used in clinical practice both domestically and internationally. When X-rays irradiate the human body, they can inhibit, damage, or even cause necrosis of cells, leading to varying degrees of physiological, pathological, and biochemical changes in the body. Therefore, patients and medical staff need to take necessary precautions during X-ray examinations or surgeries involving radiation to avoid excessive X-ray exposure affecting physiological functions.

[0003] In current examinations and treatments, the commonly used protective measures are wearing lead protective aprons, neck warmers, etc., or using existing protective curtains with fixed structures. However, wearable protective measures are cumbersome and prone to slipping, which affects the examination work of medical staff and reduces their work efficiency. In addition, multiple people wearing the same protective gear can easily cause cross-infection. Moreover, because lead protective aprons and neck warmers are heavy, they are inconvenient for radiology medical staff to perform medical work. Therefore, using protective curtains is the primary choice for medical staff. However, most existing protective curtains are fixed structures and are usually fixed in one place and cannot be moved. Furthermore, if the protective curtain is damaged, it cannot be replaced, resulting in a waste of resources. In addition, most existing protective curtains are one-piece screens, which cannot be selectively opened or closed during use. If they are not in use, they must be completely removed and then moved back when needed, which is inconvenient.

[0004] Therefore, the present invention provides a protective device for radiation sources in radiology departments to solve the above-mentioned problems. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the present invention provides a protective device for radiation sources in radiology departments, which solves the problems that most of the protective curtains mentioned above are fixed structures and are usually fixed in one place and cannot be moved, cannot be replaced individually, and cannot be selectively opened and closed during use.

[0006] A protective device for radiation sources in a radiology department includes a base, a support rod fixedly mounted on the upper surface of the base, a top plate fixedly connected to the top of the support rod via an extension plate, three brackets fixedly at equal intervals at the lower edge of the top plate, an adjustment assembly mounted on each bracket, an annular drive plate slidably mounted on the lower surface of the top plate, an internal meshing drive gear slidably mounted on the front side of the support rod and below the top plate, multiple sets of winding assemblies mounted on the internal meshing drive gear, rollers mounted at the four corners of the bottom of the base, and a drive assembly mounted on the top plate.

[0007] Preferably, each set of adjustment components includes a first drive rod rotatably mounted inside each of the brackets; an arc-shaped adjustment rack fixedly mounted on the upper end of each first drive rod; a first adjustment rod rotatably mounted on the lower end of each first drive rod; a first adjustment frame rotatably mounted on the lower end of each first adjustment rod; three first adjustment frames fixedly mounted on a first adjustment ring; a second drive rod rotatably mounted on the lower end of each first adjustment rod and located inside the first adjustment frame; a second adjustment rod rotatably mounted on the lower end of each second drive rod; a second adjustment frame rotatably mounted on the lower end of each second adjustment rod; and three second adjustment frames fixedly mounted on a second adjustment ring.

[0008] Preferably, a first annular groove is formed on the lower end face of the top plate; an annular slide rail is fixedly installed on the upper end face of the annular drive plate; the annular drive plate is slidably installed in the first annular groove via the annular slide rail.

[0009] Preferably, a spiral drive bar is fixedly provided on the lower end face of the annular drive plate; the spiral drive bar meshes with all three of the arc-shaped adjusting racks.

[0010] Preferably, a support plate is fixedly installed on the front side of the support rod and below the extension plate; an arc-shaped slide rail is fixedly installed on the front side of the support plate; a second annular groove is provided on the outer side wall of the internal meshing drive gear; the internal meshing drive gear is slidably mounted on the arc-shaped slide rail through the second annular groove.

[0011] Preferably, the winding assembly includes a plurality of support rings fixedly installed on the top plate; a winding gear is rotatably installed on each support ring; a winding groove is formed on the outer side wall of the winding gear; a winding rod is fixedly installed in the winding groove; a fixing block is fixedly installed on the second adjusting ring; a protective curtain is installed between the winding gear and the second adjusting ring; and the upper end of the protective curtain is fixedly sleeved on the winding rod, and the lower end of the protective curtain is fixedly installed on the fixing block; and the edges of two adjacent protective curtains are in contact with each other.

[0012] Preferably, a plurality of drive blocks are fixedly installed at equal intervals on the upper end face of the internal meshing drive gear; and the drive blocks are inserted between two adjacent teeth of the winding gear; the internal meshing drive gear passes through the inner center of each of the support rings.

[0013] Preferably, the drive assembly includes a drive gear ring fixedly mounted on the outer side wall of the annular drive plate; a drive motor fixedly mounted on the top plate; a drive shaft mounted on the output end of the drive motor; a drive gear fixedly mounted on the lower end of the drive shaft extending downward through the top plate; and the drive gear ring and the internal meshing drive gear meshing on both sides of the drive gear.

[0014] Preferably, a rotating rod is fixedly installed inside each of the brackets; the upper end of each first drive rod is rotatably mounted to the bracket via the rotating rod; a first rotating shaft is installed at the lower end of the first drive rod; the first adjusting rod is rotatably connected to the first drive rod via the first rotating shaft; a first mounting shaft is fixedly installed inside each first adjusting frame; the lower end of the first adjusting rod and the upper end of the second drive rod are both rotatably mounted to the first adjusting frame via the first mounting shaft; a second rotating shaft is installed at the lower end of the second drive rod; the second adjusting rod is rotatably connected to the second drive rod via the second rotating shaft; a second mounting shaft is fixedly installed inside each second adjusting frame; the lower end of the second adjusting rod is rotatably mounted to the second adjusting frame via the second mounting shaft.

[0015] The beneficial effects of this invention are as follows: 1. This invention, by setting up a drive assembly, an adjustment assembly, and a retraction assembly, and making each part cooperate with each other, uses a drive motor to drive the drive gear, drive gear ring, and internal meshing drive gear to rotate simultaneously, thereby driving three arc-shaped adjustment racks to rotate, so that the first drive rod and the second drive rod rotate in the same direction, and the first adjustment rod and the second adjustment rod rotate in the same direction. At the same time, the internal meshing drive gear drives the retraction gear to rotate and retract the protective curtain, so as to selectively retract and extend the protective curtain during use, and simply retract it without removing it when not in use, thus improving the convenience and practicality of the device.

[0016] 2. The present invention makes the protective curtain detachable and the protective curtain is made of multiple pieces. When the protective curtain is damaged, only the damaged protective curtain needs to be replaced, thereby reducing the waste of resources.

[0017] 3. By incorporating rollers, this invention makes the device movable, allowing it to be moved freely according to the needs of medical personnel, thereby further meeting their work requirements and improving the device's practicality in actual treatment processes. Attached Figure Description

[0018] Figure 1 This is a front-view three-dimensional structural schematic diagram of the present invention; Figure 2 This is a top view of the present invention; Figure 3 For the present invention Figure 2 A three-dimensional cross-sectional view along the AA direction; Figure 4 This is a three-dimensional structural diagram of the present invention after part of the protective curtain has been removed; Figure 5 For the present invention Figure 4 The left view; Figure 6 For the present invention Figure 5 Top view of the cross section along the middle BB direction; Figure 7 For the present invention Figure 5 Front view section in the CC direction; Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle; Figure 9 For the present invention Figure 3 Enlarged view of point B in the middle; Figure 10 For the present invention Figure 6 Enlarged view of point C in the middle; Figure 11 For the present invention Figure 4 Enlarged view of point D in the middle.

[0019] In the picture: 1. Base; 2. Support rod; 3. Extension plate; 4. Top plate; 5. Bracket; 6. Adjustment assembly; 7. Annular drive plate; 8. Internal meshing drive gear; 9. Winding assembly; 10. Roller; 11. First drive rod; 12. Arc-shaped adjusting rack; 13. First adjusting rod; 14. First adjusting frame; 15. First adjusting ring; 16. Second drive rod; 17. Second adjusting rod; 18. Second adjusting frame; 19. Second adjusting ring; 20. First annular groove; 21. 21. Annular slide rail; 22. Spiral drive bar; 23. Support plate; 24. Arc-shaped slide rail; 25. Second annular slide groove; 26. Support ring; 27. Rewind gear; 28. Rewind groove; 29. ​​Rewind rod; 30. Fixing block; 31. Protective curtain; 32. Drive block; 33. Drive gear ring; 34. Drive motor; 35. Drive shaft; 36. Drive gear; 37. Rotating rod; 38. First rotating shaft; 39. First mounting shaft; 40. Second rotating shaft; 41. Second mounting shaft. Detailed Implementation

[0020] The following will refer to the attached reference. Figures 1 to 11The various embodiments of the present invention will be described in detail below. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0021] A protective device for radiation sources in radiology departments, as shown in the attached document. Figure 1 To be continued Figure 11 As shown, the system includes a base 1, a support rod 2 fixedly mounted on the upper surface of the base 1; a top plate 4 fixedly connected to the top of the support rod 2 via an extension plate 3; three brackets 5 fixedly at equal intervals at the lower edge of the top plate 4; an adjustment assembly 6 mounted on each bracket 5; an annular drive plate 7 slidably mounted on the lower surface of the top plate 4; an internal meshing drive gear 8 slidably mounted on the front side of the support rod 2 and below the top plate 4; multiple sets of winding assemblies 9 mounted on the internal meshing drive gear 8; rollers 10 mounted at the four corners of the bottom of the base 1; and a drive assembly mounted on the top plate 4.

[0022] In practical use, the device is first moved next to the medical staff who need protection. Then, the drive assembly drives the annular drive plate 7 and the internal meshing drive gear 8 to rotate, which in turn drives the adjustment assembly 6 and the winding assembly 9 to adjust the device.

[0023] As attached Figure 5 Appendix Figure 8 As shown, each set of adjustment components 6 includes a first drive rod 11 rotatably mounted inside the bracket 5; an arc-shaped adjustment rack 12 is fixedly mounted on the upper end of each first drive rod 11; a first adjustment rod 13 is rotatably mounted on the lower end of each first drive rod 11; a first adjustment frame 14 is rotatably mounted on the lower end of each first adjustment rod 13; three first adjustment frames 14 are fixedly mounted on a first adjustment ring 15; a second drive rod 16 is rotatably mounted on the lower end of each first adjustment rod 13 and inside the first adjustment frame 14; a second adjustment rod 17 is rotatably mounted on the lower end of each second drive rod 16; a second adjustment frame 18 is rotatably mounted on the lower end of each second adjustment rod 17; and three second adjustment frames 18 are fixedly mounted on a second adjustment ring 19.

[0024] In practical use, the drive assembly drives the annular drive plate 7 to rotate, which in turn drives the three arc-shaped adjusting racks 12 to rotate, which in turn drives the first drive rod 11 to rotate. When the arc-shaped adjusting racks 12 rotate clockwise (towards...), the rotation is complete. Figure 8 Taking this as an example, it will drive the first drive rod 11 and the second drive rod 16 to rotate clockwise, further driving the first adjusting rod 13 and the second adjusting rod 17 to rotate counterclockwise, thereby driving the first adjusting ring 15 and the second adjusting ring 19 to move upward.

[0025] As attached Figure 7 Appendix Figure 8 As shown, a first annular groove 20 is provided on the lower end face of the top plate 4; an annular slide rail 21 is fixedly installed on the upper end face of the annular drive plate 7; the annular drive plate 7 is slidably installed in the first annular groove 20 through the annular slide rail 21.

[0026] In practical use, since the annular drive plate 7 is slidably installed in the first annular slide groove 20 through the annular slide rail 21, the drive assembly can drive the annular drive plate 7 to rotate in the top plate 4, thereby further driving the three arc-shaped adjusting racks 12 to rotate, and further driving the first drive rod 11 and the second drive rod 16 to rotate in the same direction, and the first adjusting rod 13 and the second adjusting rod 17 to rotate in the same direction, thereby driving the first adjusting ring 15 and the second adjusting ring 19 to move up and down.

[0027] As attached Figure 7 Appendix Figure 8 As shown, a spiral drive bar 22 is fixedly provided on the lower end face of the annular drive plate 7; the spiral drive bar 22 meshes with the three arc-shaped adjusting racks 12.

[0028] In practical use, when the drive assembly drives the annular drive plate 7 to rotate, the spiral drive bar 22 fixedly installed on the lower end face of the annular drive plate 7 will drive the three arc-shaped adjusting racks 12 to rotate, which in turn drives the first drive rod 11 and the second drive rod 16 to rotate in the same direction, and the first adjusting rod 13 and the second adjusting rod 17 to rotate in the same direction, thereby driving the first adjusting ring 15 and the second adjusting ring 19 to move up and down.

[0029] As attached Figure 3 Appendix Figure 8 Appendix Figure 9 As shown, a support plate 23 is fixedly installed on the front side of the support rod 2 and below the extension plate 3; an arc-shaped slide rail 24 is fixedly installed on the front side of the support plate 23; a second annular groove 25 is provided on the outer side wall of the internal meshing drive gear 8; the internal meshing drive gear 8 is slidably mounted on the arc-shaped slide rail 24 through the second annular groove 25.

[0030] In practical use, since the internal meshing drive gear 8 is slidably mounted on the arc-shaped slide rail 24 through the second annular slide groove 25, the drive assembly can drive the internal meshing drive gear 8 to slide on the arc-shaped slide rail 24, further driving the winding assembly 9 to rotate.

[0031] As attached Figure 1 Appendix Figure 4 Appendix Figure 5 Appendix Figure 11As shown, the winding assembly 9 includes multiple support rings 26 fixedly installed on the top plate 4; a winding gear 27 is rotatably installed on each support ring 26, the winding gear 27 being an internal meshing helical gear; a winding groove 28 is provided on the outer side wall of the winding gear 27; a winding rod 29 is fixedly installed in the winding groove 28; a fixing block 30 is fixedly installed on the second adjusting ring 19; a protective curtain 31 is installed between the winding gear 27 and the second adjusting ring 19; the upper end of the protective curtain 31 is fixedly sleeved on the winding rod 29, and the lower end of the protective curtain 31 is fixedly installed on the fixing block 30; and the edges of two adjacent protective curtains 31 are in contact with each other.

[0032] As attached Figure 8 Appendix Figure 11 As shown, multiple drive blocks 32 are fixedly installed at equal intervals on the upper end face of the internal meshing drive gear 8; and the drive blocks 32 are inserted between two adjacent teeth of the winding gear 27; the internal meshing drive gear 8 passes through the center of the interior of each support ring 26.

[0033] In practical use, the drive assembly drives the internal meshing drive gear 8 to slide on the arc-shaped slide rail 24. Since the upper end face of the internal meshing drive gear 8 is equally spaced and fixedly installed with multiple drive blocks 32, and the drive blocks 32 are inserted between two adjacent teeth of the winding gear 27, when the internal meshing drive gear 8 rotates, it can drive the winding gear 27 to rotate on its corresponding support ring 26, thereby realizing the selective opening and closing of the protective curtain 31.

[0034] As attached Figure 3 Appendix Figure 6 Appendix Figure 9 Appendix Figure 10 As shown, the drive assembly includes a drive gear ring 33 fixedly mounted on the outer side wall of the annular drive plate 7; a drive motor 34 fixedly mounted on the top plate 4; a drive shaft 35 mounted on the output end of the drive motor 34; a drive gear 36 fixedly mounted on the lower end of the drive shaft 35 extending downward through the top plate 4; the drive gear ring 33 and the internal meshing drive gear 8 respectively mesh on both sides of the drive gear 36.

[0035] As attached Figure 5 Appendix Figure 7As shown, a rotating rod 37 is fixedly installed inside each of the brackets 5; the upper end of each of the first drive rods 11 is rotatably installed to the bracket 5 via the rotating rod 37; a first rotating shaft 38 is installed at the lower end of the first drive rod 11; the first adjusting rod 13 is rotatably connected to the first drive rod 11 via the first rotating shaft 38; a first mounting shaft 39 is fixedly installed inside each of the first adjusting frames 14; the lower end of the first adjusting rod 13 and the upper end of the second drive rod 16 are both rotatably installed to the first adjusting frame 14 via the first mounting shaft 39; a second rotating shaft 40 is installed at the lower end of the second drive rod 16; the second adjusting rod 17 is rotatably connected to the second drive rod 16 via the second rotating shaft 40; a second mounting shaft 41 is fixedly installed inside each of the second adjusting frames 18; the lower end of the second adjusting rod 17 is rotatably installed to the second adjusting frame 18 via the second mounting shaft 41.

[0036] In practical use, first move the device next to the medical personnel who need protection, then turn on the drive motor 34 (the drive motor 34 is connected to a power controller). Since the drive gear ring 33 is fixedly installed on the outer wall of the annular drive plate 7, and the drive gear ring 33 and the internal meshing drive gear 8 are respectively meshed on both sides of the drive gear 36, when the drive motor 34 drives the drive gear 36 to rotate clockwise, it drives the drive gear ring 33 and the internal meshing drive gear 8 to rotate counterclockwise, thereby driving the annular drive plate 7 to rotate clockwise. The spiral drive bar 22 fixedly installed on the lower end face of the annular drive plate 7 will drive the three arc-shaped adjusting racks 12 to rotate clockwise, which in turn drives the first drive rod 11 and the second drive rod. Rotating 16 clockwise further drives the first adjusting rod 13 and the second adjusting rod 17 to rotate counterclockwise, which in turn drives the first adjusting ring 15 and the second adjusting ring 19 to move upward. At the same time, the internal meshing drive gear 8 rotates counterclockwise, driving the winding gear 27 to wind up the protective curtain 31. Since the lower end of the protective curtain 31 is fixedly installed on the fixed block 30, the winding gear 27 will also drive the second adjusting ring 19 to move upward when winding up the protective curtain 31. Similarly, when the drive motor 34 drives the drive gear 36 to rotate counterclockwise, it drives the drive gear ring 33 and the internal meshing drive gear 8 to rotate clockwise, thereby lowering the protective curtain 31.

[0037] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A protective device for radiation sources in a radiology department, comprising a base (1), characterized in that, A support rod (2) is fixedly installed on the upper surface of the base (1); a top plate (4) is fixedly connected to the top of the support rod (2) via an extension plate (3); three brackets (5) are fixed at equal intervals at the lower edge of the top plate (4); an adjustment assembly (6) is installed on each bracket (5); an annular drive plate (7) is slidably installed on the lower surface of the top plate (4); an internal meshing drive gear (8) is slidably installed on the front side of the support rod (2) and below the top plate (4); multiple sets of winding assemblies (9) are installed on the internal meshing drive gear (8); rollers (10) are installed at the four corners of the bottom of the base (1); and a drive assembly is installed on the top plate (4).

2. A protective device for radiation sources in a radiology department according to claim 1, characterized in that, Each set of adjustment components (6) includes a first drive rod (11) rotatably mounted inside the bracket (5); an arc-shaped adjustment rack (12) is fixedly mounted on the upper end of each first drive rod (11); a first adjustment rod (13) is rotatably mounted on the lower end of each first drive rod (11); a first adjustment frame (14) is rotatably mounted on the lower end of each first adjustment rod (13); three first adjustment frames (14) are fixedly mounted on a first adjustment ring (15); a second drive rod (16) is rotatably mounted on the lower end of each first adjustment rod (13) and inside the first adjustment frame (14); a second adjustment rod (17) is rotatably mounted on the lower end of each second drive rod (16); a second adjustment frame (18) is rotatably mounted on the lower end of each second adjustment rod (17); three second adjustment frames (18) are fixedly mounted on a second adjustment ring (19).

3. A protective device for radiation sources in a radiology department according to claim 2, characterized in that, A first annular groove (20) is provided on the lower end face of the top plate (4); an annular slide rail (21) is fixedly installed on the upper end face of the annular drive plate (7); the annular drive plate (7) is slidably installed in the first annular groove (20) through the annular slide rail (21).

4. A protective device for radiation sources in a radiology department according to claim 3, characterized in that, A spiral drive bar (22) is fixedly provided on the lower end face of the annular drive plate (7); the spiral drive bar (22) meshes with the three arc-shaped adjusting racks (12).

5. A protective device for radiation sources in a radiology department according to claim 4, characterized in that, A support plate (23) is fixedly installed on the front side of the support rod (2) and below the extension plate (3); an arc-shaped slide rail (24) is fixedly installed on the front side of the support plate (23); a second annular groove (25) is provided on the outer side wall of the internal meshing drive gear (8); the internal meshing drive gear (8) is slidably installed on the arc-shaped slide rail (24) through the second annular groove (25).

6. A protective device for radiation sources in a radiology department according to claim 5, characterized in that, The winding assembly (9) includes a plurality of support rings (26) fixedly installed on the top plate (4); a winding gear (27) is rotatably installed on each support ring (26); a winding groove (28) is provided on the outer side wall of the winding gear (27); a winding rod (29) is fixedly installed in the winding groove (28); a fixing block (30) is fixedly installed on the second adjusting ring (19); a protective curtain (31) is installed between the winding gear (27) and the second adjusting ring (19); the upper end of the protective curtain (31) is fixedly sleeved on the winding rod (29), and the lower end of the protective curtain (31) is fixedly installed on the fixing block (30); and the edges of two adjacent protective curtains (31) are in contact with each other.

7. A protective device for radiation sources in a radiology department according to claim 6, characterized in that, Multiple drive blocks (32) are fixedly installed at equal intervals on the upper end face of the internal meshing drive gear (8); and the drive blocks (32) are inserted between two adjacent teeth of the winding gear (27); the internal meshing drive gear (8) passes through the center of the interior of each support ring (26).

8. A protective device for radiation sources in a radiology department according to claim 7, characterized in that, The drive assembly includes a drive gear ring (33) fixedly mounted on the outer side wall of the annular drive plate (7); a drive motor (34) fixedly mounted on the top plate (4); a drive shaft (35) mounted on the output end of the drive motor (34); a drive gear (36) fixedly mounted on the lower end of the drive shaft (35) extending downward through the top plate (4); the drive gear ring (33) and the internal meshing drive gear (8) respectively mesh on both sides of the drive gear (36).

9. A protective device for radiation sources in a radiology department according to claim 8, characterized in that, A rotating rod (37) is fixedly installed inside each of the brackets (5); the upper end of each of the first drive rods (11) is rotatably installed to the bracket (5) via the rotating rod (37); a first rotating shaft (38) is installed at the lower end of the first drive rod (11); the first adjusting rod (13) is rotatably connected to the first drive rod (11) via the first rotating shaft (38); a first mounting shaft (39) is fixedly installed inside each of the first adjusting frames (14); the lower end of the first adjusting rod (13) and the upper end of the second drive rod (16) are both rotatably installed to the first adjusting frame (14) via the first mounting shaft (39); a second rotating shaft (40) is installed at the lower end of the second drive rod (16); the second adjusting rod (17) is rotatably connected to the second drive rod (16) via the second rotating shaft (40); a second mounting shaft (41) is fixedly installed inside each of the second adjusting frames (18); the lower end of the second adjusting rod (17) is rotatably installed to the second adjusting frame (18) via the second mounting shaft (41).

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