Adjustable shadowless lamp
By designing an adjustable shadowless lamp including a top fixing plate, a housing, a support frame, a sector mounting plate and a strip mounting plate, the problem of rapid and precise adjustment of the illumination range in the prior art is solved, and the appropriate setting of the distance between the shadowless lamp and the incision is achieved, and the safety of surgical operations and postoperative cleaning efficiency is improved.
Patent Information
- Application Number
- CN202311226721.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-22
- Publication Date
- 2025-03-25
AI Technical Summary
Existing adjustable shadowless lights cannot quickly and accurately adjust the illumination range, and will affect surgical operation when the shadowless light is too close to the incision.
An adjustable shadowless lamp consisting of a top fixing plate, a housing, a support frame, a sector mounting plate and a strip mounting plate are designed. With the fit of the outer sleeve and the connecting rod, the strip mounting plate can be opened or contracted to adjust the light range and improve the light utilization through the reflective ring.
The rapid and precise adjustment of the shadowless lamp is achieved, which avoids the impact of surgical operation caused by the distance between the shadowless lamp and the incision too close, and improves the effect and efficiency of postoperative cleaning.
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Figure CN119687423A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of medical equipment, and in particular to an adjustable shadowless lamp. Background Art
[0002] Adjustable shadowless lamps are used to illuminate the surgical site to best observe small, low-contrast objects at different depths in the incision and body cavity. Since the surgeon's head, hands and instruments may cast interfering shadows on the surgical site, the adjustable shadowless lamp should be designed to eliminate shadows as much as possible and minimize color distortion.
[0003] Since operating rooms are generally shared by multiple departments, and the incision areas for different types of surgeries are different and have large range differences, in view of the above situation, the existing technology cannot quickly adjust the irradiation range of the shadowless lamp to adapt to surgeries of different incision types, or can only adjust the irradiation range by controlling the distance between the shadowless lamp and the incision, but the operation is cumbersome and cannot be accurately adjusted. When the distance between the shadowless lamp and the incision is too close, it will also affect the surgical operation. Summary of the invention
[0004] The main purpose of the present invention is to provide an adjustable shadowless lamp, which is easy to operate and can be precisely adjusted. The problem of the distance between the shadowless lamp and the incision being too close, thereby affecting the surgical operation, is avoided, and the effect and efficiency of postoperative cleaning are improved.
[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an adjustable shadowless lamp, comprising: a top fixing plate installed on the ceiling of an operating room, a shell located below the top fixing plate, and a support frame connecting the top fixing plate and the shell, wherein a support outer ring is installed at the lower inner part of the shell, a support inner plate is concentrically arranged inside the support outer ring, and the support inner plate and the support outer ring are connected through a plurality of fan-shaped mounting plates arranged in sequence along the circumferential direction, characterized in that: a strip mounting plate is arranged between any two adjacent fan-shaped mounting plates, so that the strip mounting plates and the fan-shaped mounting plates are staggered in the circumferential direction; LED warm light beads are installed on the lower surface of the fan-shaped mounting plate, LED cold light beads are installed on the lower surface of the strip mounting plate that is flush with the lower surface of the fan-shaped mounting plate, the thickness of the support outer ring whose upper surface is flush with the upper surfaces of the fan-shaped mounting plate and the strip mounting plate is less than the thickness of the strip mounting plate, each of the strip mounting plates is connected to a second support plate at the lower part of the end surface away from one end of the support inner plate, any two adjacent second support plates are connected by at least two second connecting plates, and reflective sheets are laid on the lower surfaces of the second support plate and the second connecting plate, so as to form a reflective ring on the outer side of the support outer ring; An inner sleeve rod is vertically installed in the center of the upper surface of the supporting inner plate, and an outer sleeve is slidably mounted on the outer side of the inner sleeve rod, and the lower end of the outer sleeve is connected to a plurality of strip mounting plates respectively through a connecting rod, and the other end of the connecting rod, one end of which is fixedly connected to the outer sleeve, is hingedly connected to an end of the strip mounting plate close to the supporting inner plate, and the other end of the strip mounting plate is rotatably connected to the supporting outer ring, and adjacent second connecting plates and the second support plate and the second connecting plates on both sides of the second support plate are all hingedly connected.
[0006] The further improved scheme in the above technical scheme is as follows: 1. In the above scheme, a support block is installed on the upper surface of the shell, a second connecting frame is hingedly installed on the support block, a connecting rod arranged perpendicular to the second connecting frame is installed on the other end of the second connecting frame whose one end is connected to the support block, a light ring with a notch is installed on the end of the connecting rod away from the second connecting frame through an L-shaped mounting frame, and fluorescent lamp beads are arranged on the surface of the light ring facing the second connecting frame. When the second connecting frame rotates from an initial vertical state to a horizontal state, the surface of the light ring on which the fluorescent lamp beads are installed faces the LED warm light lamp beads and the LED cold light lamp beads.
[0007] 2. In the above scheme, one end of each of the fan-shaped mounting plates is connected to the outer wall of the supporting inner plate, and the arc-shaped outer wall of each of the other ends is connected to the inner wall of the supporting outer ring.
[0008] 3. In the above solution, the lower end of the support frame is connected to the connecting frame arranged on the outer wall of the shell.
[0009] 4. In the above scheme, a second connecting rod extending radially is provided on the two side walls of each of the second support plates, a convex strip is provided on the side wall on which the second connecting plate is connected to the second support plate, and a through hole for the second connecting rod to pass through is opened on the radially extending convex strip, and the inner wall of the through hole is rotatably matched with the second connecting rod.
[0010] 5. In the above scheme, among the two connected second connecting plates, a side wall of one second connecting plate has a second convex strip extending radially, a second support shaft radially passes through the second convex strip and is fixedly connected to the side wall of the other second connecting plate, and the second support shaft rotates in cooperation with the second convex strip.
[0011] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: 1. The adjustable shadowless lamp of the present invention has a strip mounting plate arranged between adjacent fan-shaped mounting plates, an inner sleeve rod is vertically mounted in the center of the upper surface of the supporting inner plate, an outer sleeve is slidably mounted on the outer side of the inner sleeve rod, the lower end of the outer sleeve is connected to the strip mounting plate by a connecting rod, one end of the connecting rod is fixedly connected to the outer sleeve, and the other end of the connecting rod is hingedly connected to one end of the strip mounting plate close to the supporting inner plate, and the other end of the strip mounting plate is rotatably connected to the supporting outer ring; the strip mounting plate with lamp beads installed is driven to open and contract by moving the outer sleeve up and down, thereby realizing the adjustment of the illumination range without adjusting the overall height of the shadowless lamp, and at the same time ensuring that the illumination range is different The reflective components are set up so that each strip mounting plate is connected to a second support plate at the lower part of the end surface away from one end of the supporting inner plate, and any two adjacent second support plates are connected by at least two second connecting plates, and reflective sheets are laid on the lower surfaces of the second support plates and the second connecting plates, so as to form a reflective ring on the outer side of the supporting outer ring, and the adjacent second connecting plates and the second support plates and the second connecting plates on both sides thereof are hingedly connected, so that the reflective ring can be adaptively expanded and contracted with the opening and contraction of the strip mounting plates, thereby ensuring the utilization rate of light and the stability of light state in each illumination range.
[0012] 2. The adjustable shadowless lamp of the present invention further has a supporting block installed on the upper surface of the shell, and a second connecting frame is hingedly installed on the supporting block, and a connecting rod perpendicular to the second connecting frame is installed on the other end of the second connecting frame connected to the supporting block at one end, and a light ring with a notch is installed at the end of the connecting rod away from the second connecting frame through an L-shaped mounting frame, and fluorescent lamp beads are arranged on the surface of the light ring facing the second connecting frame. When the second connecting frame rotates from an initial vertical state to a horizontal state, the surface of the light ring with the fluorescent lamp beads installed faces the LED warm light lamp beads and the LED cold light lamp beads. By adjusting the position of the light ring with fluorescent lamp beads installed on the rotatable second connecting frame, it will not affect the normal operation, and can improve the recognition accuracy and precision of blood stains and the like remaining on the shadowless lamp after the operation, thereby improving the effect and efficiency of postoperative cleaning and avoiding residual stains due to failure to be recognized by the human eye, so as to meet the cleanliness requirements of the operating environment. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the adjustable shadowless lamp of the present invention; Figure 2 The partial structure of the adjustable shadowless lamp of the present invention is shown in FIG. Figure 1 ; Figure 3 The partial structure of the adjustable shadowless lamp of the present invention is shown in FIG. Figure 2 ; Figure 4The partial structure of the adjustable shadowless lamp of the present invention is shown in FIG. Figure 3 ; Figure 5 It is a schematic diagram of the partial disassembly structure of the adjustable shadowless lamp of the present invention.
[0014] In the above drawings: 1. Support inner plate; 2. Support outer ring; 3. Fan-shaped mounting plate; 4. Strip mounting plate; 5. Inner sleeve rod; 6. Outer sleeve; 7. Connecting rod; 8. Notch; 9. Light ring; 10. Support block; 11. LED warm light beads; 12. LED cold light beads; 13. Second connecting frame; 14. Connecting rod; 15. L-shaped mounting frame; 16. Shell; 17. Connecting frame; 18. Top fixing plate; 19. Support frame; 21. Second support plate; 22. Second connecting plate; 231. Second connecting rod; 232. Raised strip; 241. Second support shaft; 242. Second raised strip. Implementation
[0015] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.
[0016] Embodiment 1: An adjustable shadowless lamp, comprising: a top fixing plate 18 mounted on the ceiling of an operating room, a shell 16 located below the top fixing plate 18, and a support frame 19 connecting the top fixing plate 18 and the shell 16, wherein a support outer ring 2 is mounted in the lower part of the shell 16, a support inner plate 1 is concentrically arranged inside the support outer ring 2, the support inner plate 1 and the support outer ring 2 are connected by a plurality of fan-shaped mounting plates 3 sequentially arranged along the circumferential direction, and a strip mounting plate 4 is arranged between any two adjacent fan-shaped mounting plates 3, so that the strip mounting plates 4 and the fan-shaped mounting plates 3 are staggered in the circumferential direction; LED warm light beads 11 are installed on the lower surface of the fan-shaped mounting plate 3, LED cold light beads 12 are installed on the lower surface of the strip mounting plate 4 which is flush with the lower surface of the fan-shaped mounting plate 3, the thickness of the support outer ring 2 whose upper surface is flush with the upper surfaces of the fan-shaped mounting plate 3 and the strip mounting plate 4 is less than the thickness of the strip mounting plate 4, and each of the strip mounting plates 4 is connected to a second support plate 21 at the lower part of the end surface away from the end of the support inner plate 1, and any two adjacent second support plates 21 are connected by at least two second connecting plates 22, and reflective sheets are laid on the lower surfaces of the second support plates 21 and the second connecting plates 22, so as to form a reflective ring on the outer side of the support outer ring 2; When in use, the LED warm light lamps and LED cold light lamps on the lower surfaces of the multiple strip-shaped mounting plates and the multiple fan-shaped mounting plates in the initial state are located on the same plane to emit light. At this time, the lighting irradiation range is the maximum irradiation range, which is suitable for large-area surgery; An inner sleeve rod 5 is vertically installed in the center of the upper surface of the supporting inner plate 1, and an outer sleeve 6 is slidably mounted on the outer side of the inner sleeve rod 5. The lower end of the outer sleeve 6 is connected to a plurality of strip mounting plates 4 through a connecting rod 7. The other end of the connecting rod 7, one end of which is fixedly connected to the outer sleeve 6, is hingedly connected to one end of the strip mounting plate 4 close to the supporting inner plate 1. The other end of the strip mounting plate 4 is rotatably connected to the supporting outer ring 2. The adjacent second connecting plates 22 and the second support plate 21 and the second connecting plates 22 on both sides of it are all hingedly connected.
[0017] A support block 10 is installed on the upper surface of the shell 16, and a second connecting frame 13 is hingedly installed on the support block 10. A connecting rod 14 arranged perpendicular to the second connecting frame 13 is installed on the other end of the second connecting frame 13 connected to the support block 10 at one end. A light ring 9 with a notch 8 is installed on the end of the connecting rod 14 away from the second connecting frame 13 through an L-shaped mounting frame 15. Fluorescent lamp beads are arranged on the surface of the light ring 9 facing the second connecting frame 13. When the second connecting frame 13 rotates from the initial vertical state to the horizontal state, the surface of the light ring 9 on which the fluorescent lamp beads are installed faces the LED warm light lamp beads 11 and the LED cold light lamp beads 12; When the operation is over, to clean the shadowless lamp, hold the second handle to drive the second connecting frame to rotate from vertical to horizontal, so that the fluorescent lamp beads face the lower surface of the shadowless lamp, turn on the fluorescent lamp beads on the lamp ring. LSK lamp beads can be used for the fluorescent lamp beads. Under their illumination, blood and other residues on the shadowless lamp appear brown, which is convenient for medical staff to identify and clean them in time to ensure the cleanliness of the cleaning. After cleaning, turn off the fluorescent lamp beads on the lamp ring, hold the second handle to rotate the second connecting frame from horizontal back to the initial vertical state, and the light ring returns to the top of the supporting shell at the same time to avoid interference with the surgical operation.
[0018] The lower end of the support frame 19 is connected to a connecting frame 17 disposed on the outer wall of the housing 16 .
[0019] Among the two second connecting plates 22 connected as mentioned above, a second connecting plate 22 has a second ridge 242 extending radially on its side wall, a second support shaft 241 radially passes through the second ridge 242 and is fixedly connected to the side wall of the other second connecting plate 22, and the second support shaft 241 rotates in cooperation with the second ridge 242.
[0020] Embodiment 2: An adjustable shadowless lamp, comprising: a top fixing plate 18 mounted on the ceiling of an operating room, a shell 16 located below the top fixing plate 18, and a support frame 19 connecting the top fixing plate 18 and the shell 16, wherein a support outer ring 2 is mounted in the lower part of the shell 16, a support inner plate 1 is concentrically arranged inside the support outer ring 2, the support inner plate 1 and the support outer ring 2 are connected by a plurality of fan-shaped mounting plates 3 sequentially arranged along the circumferential direction, and a strip mounting plate 4 is arranged between any two adjacent fan-shaped mounting plates 3, so that the strip mounting plates 4 and the fan-shaped mounting plates 3 are staggered in the circumferential direction; LED warm light beads 11 are installed on the lower surface of the fan-shaped mounting plate 3, LED cold light beads 12 are installed on the lower surface of the strip mounting plate 4 which is flush with the lower surface of the fan-shaped mounting plate 3, the thickness of the support outer ring 2 whose upper surface is flush with the upper surfaces of the fan-shaped mounting plate 3 and the strip mounting plate 4 is less than the thickness of the strip mounting plate 4, and each of the strip mounting plates 4 is connected to a second support plate 21 at the lower part of the end surface away from the end of the support inner plate 1, and any two adjacent second support plates 21 are connected by at least two second connecting plates 22, and reflective sheets are laid on the lower surfaces of the second support plates 21 and the second connecting plates 22, so as to form a reflective ring on the outer side of the support outer ring 2; When the strip-shaped mounting plate is tilted inward, the second supporting plate fixedly connected thereto is tilted inward at the same time. During the tilting process, the connection angle of the second connecting plate is gradually reduced, so that the distance between two adjacent second supporting plates is gradually reduced, and the reflection range of the reflective sheet is reduced to adapt to the reduced illumination range, thereby improving the illumination utilization rate after the illumination range is reduced; An inner sleeve rod 5 is vertically installed in the center of the upper surface of the supporting inner plate 1, and an outer sleeve 6 is slidably mounted on the outer side of the inner sleeve rod 5. The lower end of the outer sleeve 6 is connected to a plurality of strip mounting plates 4 through a connecting rod 7. The other end of the connecting rod 7, one end of which is fixedly connected to the outer sleeve 6, is hingedly connected to one end of the strip mounting plate 4 close to the supporting inner plate 1. The other end of the strip mounting plate 4 is rotatably connected to the supporting outer ring 2. The adjacent second connecting plates 22 and the second support plate 21 and the second connecting plates 22 on both sides of it are all hingedly connected.
[0021] One end of each of the sector-shaped mounting plates 3 is connected to the outer wall of the supporting inner plate 1 , and the arc-shaped outer wall of the other end is connected to the inner wall of the supporting outer ring 2 .
[0022] A second connecting rod 231 extending in the radial direction is provided on the two side walls of each of the above-mentioned second support plates 21, and a convex strip 232 is provided on the side wall on which the second connecting plate 22 is connected to the second support plate 21. The convex strip 232 extending in the radial direction is provided with a through hole for the second connecting rod 231 to penetrate, and the inner wall of the through hole is rotatably matched with the second connecting rod 231.
[0023] Among the two second connecting plates 22 connected as mentioned above, a second connecting plate 22 has a second ridge 242 extending radially on its side wall, a second support shaft 241 radially passes through the second ridge 242 and is fixedly connected to the side wall of the other second connecting plate 22, and the second support shaft 241 rotates in cooperation with the second ridge 242.
[0024] The working principle of the present invention is as follows: when in use, the LED warm light lamps and LED cold light lamps on the lower surfaces of the multiple strip-shaped mounting plates and the multiple fan-shaped mounting plates in the initial state are located on the same plane to emit light. At this time, the lighting irradiation range provided is the maximum irradiation range, which is suitable for large-area surgery; The stepper motor drives the worm meshing with the worm gear to rotate, driving the nut inside the worm gear to rotate, thereby realizing the relative movement between the nut and the screw. The outer sleeve whose rotation is restricted by the limit rod moves up and down under the drive of the screw, further driving one end of multiple connecting rods to move up and down. Under the action of the hinged seat, during the upward movement of the connecting rod, multiple strip mounting plates with one end movably connected to the supporting outer ring are tilted and contracted inward as a whole, and the illumination range is gradually reduced to be suitable for small-area surgery, avoiding the need to repeatedly adjust the illumination height in order to adjust the illumination range during the operation, and realizing rapid adjustment of the illumination area at the same setting height; When the strip-shaped mounting plate is tilted inward, the second supporting plate fixedly connected thereto is tilted inward at the same time. During the tilting process, the connection angle of the second connecting plate is gradually reduced, so that the distance between two adjacent second supporting plates is gradually reduced, and the reflection range of the reflective sheet is reduced to adapt to the reduced illumination range, thereby improving the illumination utilization rate after the illumination range is reduced; When the operation is over, to clean the shadowless lamp, hold the second handle to drive the second connecting frame to rotate from vertical to horizontal, so that the fluorescent lamp beads face the lower surface of the shadowless lamp, turn on the fluorescent lamp beads on the lamp ring. LSK lamp beads can be used for the fluorescent lamp beads. Under their illumination, blood and other residues on the shadowless lamp appear brown, which is convenient for medical staff to identify and clean them in time to ensure the cleanliness of the cleaning. After cleaning, turn off the fluorescent lamp beads on the lamp ring, hold the second handle to rotate the second connecting frame from horizontal back to the initial vertical state, and the light ring returns to the top of the supporting shell at the same time to avoid interference with the surgical operation.
[0025] When the above-mentioned adjustable shadowless lamp is used, a supporting block is installed on the upper surface of the shell, and a second connecting frame is hingedly installed on the supporting block, and a connecting rod perpendicular to the second connecting frame is installed on the other end of the second connecting frame connected to the supporting block at one end, and a light ring with a notch is installed at the end of the connecting rod away from the second connecting frame through an L-shaped mounting frame, and fluorescent lamp beads are arranged on the surface of the light ring facing the second connecting frame. When the second connecting frame is rotated from an initial vertical state to a horizontal state, the surface of the light ring with the fluorescent lamp beads installed faces the LED warm light lamp beads and the LED cold light lamp beads. By adjusting the position of the light ring with fluorescent lamp beads installed on the rotatable second connecting frame, it will not affect the normal operation, and after the operation, the coagulated blood that is difficult to identify can be colored by the irradiation of the fluorescent lamp, thereby improving the accuracy and precision of identifying blood stains remaining on the shadowless lamp, improving the effect and efficiency of postoperative cleaning, and avoiding residual stains caused by not being recognized by the human eye, so as to meet the cleanliness requirements of the operating environment.
[0026] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.
Claims
1. An adjustable shadowless lamp, comprising: A top fixing plate (18) installed on the ceiling of an operating room, a shell (16) located below the top fixing plate (18), and a support frame (19) connecting the top fixing plate (18) and the shell (16), wherein a support outer ring (2) is installed at the lower inner portion of the shell (16), a support inner plate (1) is concentrically arranged inside the support outer ring (2), and the support inner plate (1) and the support outer ring (2) are connected via a plurality of fan-shaped mounting plates (3) arranged in sequence along the circumferential direction, characterized in that a strip mounting plate (4) is arranged between any two adjacent fan-shaped mounting plates (3), so that the strip mounting plates (4) and the fan-shaped mounting plates (3) are staggered in the circumferential direction; LED warm light beads (11) are installed on the lower surface of the fan-shaped mounting plate (3), LED cold light beads (12) are installed on the lower surface of the strip mounting plate (4) which is flush with the lower surface of the fan-shaped mounting plate (3), the thickness of the support outer ring (2) whose upper surface is flush with the upper surfaces of the fan-shaped mounting plate (3) and the strip mounting plate (4) is less than the thickness of the strip mounting plate (4), and a second support plate (21) is connected to the lower part of the end surface of each strip mounting plate (4) away from the support inner plate (1), and any two adjacent second support plates (21) are connected by at least two second connecting plates (22), and reflective sheets are laid on the lower surfaces of the second support plate (21) and the second connecting plate (22), so as to form a reflective ring on the outer side of the support outer ring (2); An inner sleeve rod (5) is vertically mounted in the center of the upper surface of the supporting inner plate (1), and an outer sleeve (6) is slidably mounted on the outer side of the inner sleeve rod (5). The lower end of the outer sleeve (6) is connected to a plurality of strip-shaped mounting plates (4) via a connecting rod (7). The other end of the connecting rod (7) is fixedly connected to the outer sleeve (6) at one end and is hingedly connected to an end of the strip-shaped mounting plate (4) close to the supporting inner plate (1). The other end of the strip-shaped mounting plate (4) is rotatably connected to the supporting outer ring (2). Adjacent second connecting plates (22) and the second support plate (21) and the second connecting plates (22) on both sides thereof are all hingedly connected.
2. The adjustable shadowless lamp according to claim 1, characterized in that: A support block (10) is installed on the upper surface of the shell (16), and a second connecting frame (13) is hingedly installed on the support block (10); a connecting rod (14) arranged perpendicular to the second connecting frame (13) is installed on the other end of the second connecting frame (13) connected to the support block (10) at one end; a light ring (9) having a notch (8) is installed on the end of the connecting rod (14) away from the second connecting frame (13) through an L-shaped mounting frame (15); fluorescent lamp beads are arranged on the surface of the light ring (9) facing the second connecting frame (13); when the second connecting frame (13) rotates from an initial vertical state to a horizontal state, the surface of the light ring (9) on which the fluorescent lamp beads are installed faces the LED warm light lamp beads (11) and the LED cold light lamp beads (12).
3. The adjustable shadowless lamp according to claim 1, characterized in that: One end of each of the sector-shaped mounting plates (3) is connected to the outer wall of the supporting inner plate (1), and the arc-shaped outer wall of each of the other ends is connected to the inner wall of the supporting outer ring (2).
4. The adjustable shadowless lamp according to claim 1, characterized in that: The lower end of the support frame (19) is connected to a connecting frame (17) arranged on the outer wall of the shell (16).
5. The adjustable shadowless lamp according to claim 1, characterized in that: A second connecting rod (231) extending in the radial direction is disposed on both side walls of each second support plate (21); a convex strip (232) is disposed on the side wall at which the second connecting plate (22) is connected to the second support plate (21); a through hole for the second connecting rod (231) to pass through is formed on the convex strip (232) extending in the radial direction; the inner wall of the through hole is rotatably matched with the second connecting rod (231).
6. The adjustable shadowless lamp according to claim 1 or 5, characterized in that: Among the two connected second connecting plates (22), a second convex strip (242) extending radially is provided on the side wall of one second connecting plate (22), a second support shaft (241) radially passes through the second convex strip (242) and is fixedly connected to the side wall of the other second connecting plate (22), and the second support shaft (241) is rotatably matched with the second convex strip (242).